• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A system for directing a web of flexible material to a predetermined location and more particularly to a system for directing the free end or tail of the web into threading engagement with rolls forming a hip or the like. In the system a gas such as air is directed through a restricted opening under pressure whereupon it attaches itself to a flow attachment surface due to the "Coanda effect", is directed to the predetermined location and entrains ambient air. The tail of the web is placed into the path of the moving gas and entrained thereby. The gas is moving at a velocity greater than the velocity of the moving web and thus the web tail is straightened out and directed to the predetermined location.
    公开号:SU797599A3
    申请号:SU762361204
    申请日:1976-05-25
    公开日:1981-01-15
    发明作者:Реба Имантс；Хью Хоглэнд Джеральд；Лестер Поллард Фред
    申请人:Краун Целлербах Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    (54) DEVICE, FOR SUBMITTING THE END OF A PAPER HEAT IN A PAPER MACHINE
    The invention relates to the paper industry, in particular, to devices for feeding the end of the paper web to the paper machine.
    A device is known for supplying the end of a paper web to a papermaking machine, which comprises an air nozzle pj mounted on a bracket.
    However, in this device, conventional air nozzles can only be used to deflect or transport the end of the web for a relatively short distance. Moreover, such a device is not very effective because it uses relatively large amounts of compressed air and operates at lower speeds because of the possibility the occurrence of a blade break.
    The purpose of the invention is to increase reliability in operation.
    The goal is achieved by the fact that the device for feeding the end of the paper web in the paper machine, comprising a non-air nozzle mounted on the bracket, has a groove-like guide for the web end in the paper machine, has an air nozzle mounted on the bracket, has a yellow-like guide for the web end, located in front of the nozzle in the direction of movement of the blade, and the air nozzle is made slit, located under the groove-shaped guide perpendicular to its free end and about It is formed by a vertical wall fixed on the bracket and a guide element for the flow of air with a curved arcuate surface.
    ;; The guide-like guideway consists of two parts, between which the flooring races. an additional air nozzle, one of the parts being 0 linear, while the other part is curvilinear, for example arcuate. The gutter-shaped guide and nozzle bracket are connected by a handle.
    The rectilinear part of the trough-shaped guide consists of two telescopically connected parts and has a hinged plate for deflecting the air flow according to the change in the angle of inclination
    right side of the chyloid guide.
    FIG. 1 schematically shows the proposed device, a general view in FIG. 2, a node 1 in FIG. 1, (in an enlarged view); in fig. 3 shows the section A-L in FIG. i; in fig. 4-7 is a side view of Fig. | 1 at various and successive stages of operation in FIG. 8 and 9 - constructive options for the device; FIG. 10 shows a cross-section BB in FIG. 9i in FIG. 11 is the fourth embodiment of the device; in fig. 12, the working parts of FIG. eleven; in fig. 13B-B cross-section in FIG. 12J in FIG. 14 - the fifth version of the device in cross section; in fig-. 15 is a plan view of FIG. 14; in fig. 16 and 17, the working parts of the means for creating a high-speed gas flow; in fig. 18 - section GG in FIG. 15; in fig. 19 - view similar to FIG. 18 with web orientation; on Fig and 21 - air nozzles; in fig. 22 is a side view of FIG. 19J in FIG. 23 is a view similar to FIG. 22, but using the nozzle shown in FIG. 18, in FIG. 24 is a sixth embodiment of the device.
    The device for feeding the end 1 of the paper web 2 contains a two-dimensional air-slotted Konda 4 nozzle 4 mounted on the arms 3. In front of the nozzle 4 there is a groove-shaped guide b in the direction of movement of the web 2. The nozzle 4 is located perpendicular to the free end 7 a rail b and is formed by a vertical wall 8 mounted on a bracket 3 of rolled steel or extruded aluminum and a guide element 9 for the flow of air with a curved arcuate rail 10, p below the nozzle 4. The guide 10 has a smooth surface with which the air flow adheres, and the element 9 can be made of rolled steel, extruded with aluminum or foil. The gutter-shaped guide b consists of a rectilinear 11 and curved 12 parts, the bottom 13 and two side walls 14 and 15, extending along the entire length of the bottom 16. From the top, the gutter-shaped guide 6 is open and has two open ends 17 and 18. From the nozzle 4, the flat stream of air has basically the same thickness over the entire width of the grooved guide. 6, with the speed of the outgoing air flow from the nozzle 4 being greater than the speed of the web 2. Between the portions 11 and 12 of the trough-shaped guide 6 there is an additional two-dimensional section 19 in the form
    a slit that is formed by a similar vertical wall 8 made of rolled steel or extruded aluminum and a similar guide element 9 made of foil for air flow with a curved arcuate surface located below the nozzle 19. The nozzle 19, like the nozzle 4, is mounted on the bracket 3, containing mounted L-shaped element 20 and and-shaped element 21, which together with the wall 8 form vertical legs 22 and 23. The size of the slotted nozzle 19 can be adjusted by adjusting screws 24 and lock nuts 25 anovlennyh in threaded holes (not shown) of the vertical wall 23. The legs 8 and the air supply control, passing through nozzle 19 may also be effected by varying the pressure of air supplied. The curved part 12 of the groove-shaped guide b has a plate 27 mounted on the hinge 26 to deflect air flow in accordance with the change in the angle of inclination of the rectilinear part 11 of the groove-like guide 6. Means can be used to control the plate 27, which also hold it in the desired position and adjust the gap 28. The L-shaped element 20, the U-shaped element 21 and the element 9 form a cavity 29, which has a hydraulic connection to the air supply line 30, which is connected to a source (not shown) th air via a valve (not shown).
    The device is installed between two calenders 31 and 32 of the paper machine. The calender 31 has two calender rolls 33 and 34 forming a gap (not shown) for feeding the paper web 2. The distance between the calenders 31 and 32 is different and usually reaches 6 meters or more. Below the calender 32 is a vat 35 for collecting the rejected web 2, which is also used in production.
    The principle of operation of the proposed device is as follows.
    If canvas 2 has broken through, the free end 1 coming out of the gap between the shafts of the calender 32 falls down into the tank 35. The operator can manually direct the end 1 of the blade 2 to the tank 35, but after the movement in the chan has begun, will continue. The width of the mouthpiece is small and is, for example, from two to six inches compared with the width of web 2 passing through a conventional papermaking machine.
    Immediately after trimming the end 1 of the blade 2, a stream of compressed air is directed to the newly formed free or filling end 4 of the blade 2 by means of a hose 5. As a result of the impact of the air stream, the new end is displaced into the groove-shaped guide b the flow formed during the operation of the bracket 3 and the element 9. Since the speed of such a gaseous flow exceeds the speed of the papermaking machine, the end 1 of the web 2 straightens and enters into interaction with the gaseous flow, uslovlennil action arm 3 and element 9 in curved junction 12 and 11 rectilinear portions. Thus, the combination of two foil elements and two brackets provides a continuous stream of gas flow in the trough-shaped guide 6.
    The end 1 of the web 2, having reached the open end 17 of the guide b, is guided into the gap between the calender rollers 33 and 34, since the air flow serves to maintain the end 1 of the web 2 in a straight line state at a certain minimum distance due to the rapid outflow air at its exit from the groove-shaped guide b through the open end 17. When end 1 reaches the additional nozzle 19, the end of the web is straightened so that it is removed from the curved part 12. Entering the gap between the shafts 33 and 34, the end is pulled so what with all comes from the interaction with the device. The side walls of the ends 14 and 15 prevent its lateral displacement when leaving the mesh. After the canvas 2 entered into the gap between the shafts 33 and 34 of the calender 31, the operator brings the width of the canvas to full size in a known manner. Thus, for filling the calender 31, the operator does not need to come close to the gap between its shafts. The proposed device may have several constructive options. For example, a handheld device is intended for those cases where the charge is made at short distances (0, 5-2 m). It contains a groove-shaped guide 36, having a bottom 37 and vertical side walls 38 and 39 connected to the latter and forming a cavity 40 with it and open ends 41 and 42. In this embodiment, the bottom 37 has a straight-line portion. In addition, this design uses only one combination of a bracket 43 for a nozzle 44 in the form of a slit and a foil element 45 for using the Kond effect to direct air through the cavity 40 of the guide 36. The bracket 43 and element 45 have a design similar to that used in the above construction. Gutter-shaped guide 36 and CZK
    The matte 43 for the nozzle 44 is connected by a hollow handle 46 to a hose 47 attached thereto, which serves for Tudycha compressed gas into the cavity (not shown) of the bracket 43 communicating with a slit formed between the bracket 43 and the element 45. The internal cavity of the handle 46 is A flexible hose 47 is connected to an appropriate source of compressed gas, for example, air, which is selectively connected using appropriate valve means (not shown).
    The device works as follows.
    15 way.
    For a given feed of the end 1 of the blade 2, the operator acts with the handle 46 on the valve (not shown, as a result of which compressed air enters through the hose 47 into the slot 44. The fast-moving gas stream is pressed against the surface of the element 45 and directed to the left along the bottom 37. Such movement gas leads to an increased flow of ambient air to the cavity 40. The operator then manipulates the hand-held device so that the end 1 of the blade 2 falls into the cavity 40 where it is picked up by the gaseous stream passing through it. the gas in cavity 40 was greater than the speed of web 2, the caNOJM end of the web was tight and could be easily guided by the operator to the desired location.
    5 If necessary, the device may be hinged on the corresponding frame to create a support / and the operator may change the angular position of the device. So for example for defective
    0 blades. The hinge-fixed device can be installed near the tank 35, guided the torn sheet 2 into the tank 35 when the device is rotated in the vertical plane and
    5 is aimed at the tank 35. By changing the angular position of the device, the operator can change the directivity of the end i of the web by aiming it at a desired point, for example, the gap between two
    0 shafts or in the first nozzle of the next filling device.
    In another constructive embodiment, the device is installed between the shafts 48 and 49, forming a gap, through
    5 which exits the web 2 and the calender 50 comprising shafts 51a-51h forming gaps. The device also comprises a base 53 mounted on wheels 52 of any suitable construction, having at one end
    0 54 two vertical posts 55, -a on the other end 56 - a bracket 57, on which a tubular support element 58 provided with a hole 59 made on its upper end is fixed by any method, for example, using an axis of rotation a. A smaller diameter tube 60 is movably mounted in support member 58 and provided with openings 61, made along the entire length of tube 60 / which can be selectively aligned with openings 59. Fixing tube 60 in the desired position relative to the tubular support member 58 is carried out using checks which is inserted into the hole 59 and into any of the holes 61. The device comprises a groove-shaped guide 62, having a straight line 63 and a curved 64 part. The guide 62 has a bottom 65 and two side walls 66 and 67. The means for introducing and directing the flow of gas is made in the form of two-dimensional Kond nozzles of the same type as in FIG. 1-7 are installed at both ends of the curved part 64. The side walls 66 and 67 and the bottom 65 can be rotated around an axis 68 passing between the supporting rod 55 and through the side walls 66 and 67. The bottom 65 is hinged by means of a bracket and an assembly 69 to the upper end of the tube 60. The linear part .63 consists of two telescopically connected parts in the form of groove-like guides 62 and 70. The latter has a bottom 71 and two side walls 72 and 73. The upper parts of the side walls 66, 67 and 72, 73 are folded over, forming inverted and -shaped sk The gutters are 74 and 75. The operator can manually move the groove-shaped guide 70 relative to the rest of the device.
    Thus, the proposed device can be used for. different production points, for example, to feed the end 1 of the web 2 selectively to the various gaps of the large calender 50. The operator can adjust the angle of the path of the end of the web, making the appropriate adjustments using the previously described adjustment mechanism. The elongated guides 62 and 70 can close enough to bring the end 1 of the web 2 to the job site.
    In a constructive embodiment, the device is stationary relative to the paper machine between the drying tank 76 and the calender 77 and attached to a permanent bridge 78 located between the drying tank 76 and the calender 77 The device includes a support arm 79 fixed to the bridge 78. The other end of the lever 79 is attached to a segment 80 that has a rectilinear base 81 and two side walls 82 attached to the base 81. To the segment 80 a second segment 83 is hingedly attached, which contains the rectilinear bottom 84 and laterally high walls
    85 and 86 attached to bottom 84 and extending along it. The device has three separate means for introducing and directing gas in the form of Kond 87 two-dimensional nozzles 87.88 and 89. Nozzles 88 and 89 interact with gaps 90 and 91 provided in the bottom of the device. These gaps serve as means for introducing air entrapped into the system (similar to FIGS. 1-7).
    The nozzle 87 does not have a similar gap interacting with it, as it is located on the top of the first segment 80.
    An adjusting support lever 92, fitted with a vertical through hole (not shown), departs from the tower 78, in which the supporting rod 93 is movably mounted. The adjustment of the position of the support rod 93 relative to the support lever 92 is carried out by means of an adjusting screw 94. The upper the end of the support arm 92 is pivotally connected to the bottom 84 of the second segment 83. The latter can turn relative to the first segment 80 by moving the rod 93 to different positions relative to the stop lever 92. In FIG. 11, the dotted line shows a series of positions of the second segment 83, in which the second segment is aimed at different gaps of the calender 77. For the upper gaps of the calender 77, the device is equipped with means that increase its effective length by adding one or more sliding sections. A portion of one of such sections 95 is shown in FIG. 12, and the fully extended section 95 is shown in FIG. 11 dotted line.
    The extension section 95 has a flat bottom 96 and two vertical side walls 97 connected to the bottom 96. Round bars 98 and 99 are welded (or otherwise attached) to the side walls of the section 95, with the main part protruding beyond the bottom 96 and side walls. These bars overlap the side walls 85 and 86 of the second, segment 83. and are held by stops 100 and 101, welded to side wall 65 and stops 102 and 103, welded to side wall 86. Each of these stops 100-103 has a semicircular shape in cross section . The stops 100 and 102 limit the upward movement of the rods interacting with them when the section 95 continuously moves downwards under the action of gravity. This design allows you to quickly and easily remove
    a sliding section from the device when it is not needed. When section 95 is fastened to the device as a result of the interplay of the stops and the rod, the bottom 96 is aligned with the base 84 of the second segment 83, resulting in a smooth air flow along them. The various designs of the device are applicable for cases when a web break occurs, but they can, however, be used in other cases, for example, to give the end of a new web when the machine is started up or when the paper web is replaced. The use of several Kond nozzles in the design of the proposed device does not always mean their simultaneous use. FIG. 14 and 15, a device is installed between the rotating drying tank 104 and the calender 105 of a conventional baking machine. In such a working situation, the calender 105 contains several shafts 105a-105f forming several gaps. Drying tank 104 (Fig. 14) is continuously moving clockwise; while the fabric 106 is located on the outer surface of the floating surface of the tank. Usually, the polo 106 directly from the outer surface of the drying vat enters one of the gaps of the calender 105. When a web breaks for any reason or to refuel a new web, an apparatus 107 is used, which is positioned between the drying vat 104 and the calender 105 to provide canvases between them. The device 107 comprises an upstream first segment 108 having a grooved guide, provided with a bottom 109 and two side walls 110 and 111 attached to it. The bottom is provided with an upper flow turning circle and, together with the side walls, it forms a gutter, which is open at the top and has inlet and outlet ends 112 and 113. The bottom 109 is straight. At the exit end 113, the bottom 109 is connected to a deflecting element 114 having an upper: curved flow deflecting surface. At the intersection of the bottom 109 and the deflecting element 114, the rods 115 protruding from the web-transmitting surface of the element 114 are fixed to the ends at a distance from each other. At the input end 112 there are devices made in the form of a two-dimensional Kond nozzle designed to supply a thin flat jet of high-speed gas into the trench cavity and its direction along the upper surface of the web-transmitting element 114. The two-dimensional Kond nozzle contains a bracket 116 made of rolled rod or extruded The umini located between the side walls 110 and 111 and hermetically attached to them (Fig. 18). i. The bracket 116 has an L-shaped element 117 and a U-shaped element 118, which are welded (or otherwise attached to it with three vertical paws 119, 120 and 121. To the tops of paws 120 and 121, an elliptical shape is attached to a foil element 122 having a smooth upper curved surface 123 of adhesion of the flow and a main and middle elliptical axis, i.e. large and small axis. The sticking surface 123 extends from a restricted opening formed between the front edge of the element 122 and the upper part of the paw 119, the limited opening being made in the form of an elongated slit 124 disposed across the entire width of the device. The slot width varies in the range of 0.0125-0.06 cm. The radius of curvature of the foil element gradually increases from the front to the rear edge. The leading edge radius is 1.27 cm, the L-shaped element 117, the U-shaped element and the element 122 form a cavity 125, which communicates hydraulically with a corresponding source (not shown) of compressed air. This source can be connected at the request of the operator with the help of an appropriate valve device (not shown). In the case of the advancement of compressed gas through the supply line into the cavity 125 in the form of a high-speed flat jet of moving gas located across the entire width of the bottom 109, it is necessary that the velocity of the gas exiting through the slit 124 be greater than the speed of the sheet 106 exiting the drying tank 104. Taking into account the gap width range, the gas pressure should be 0.356, 3 kg / cm -. Typically, the pressure required varies with the speed of the paper machine and the basis weight and other characteristics of the paper. Due to the Kond effect, a high / high velocity jet of gas passing through the slit 124 adheres to the surface 123 of the element 122 and is directed along it in such a way that the jet of moving gas passes along the bottom 109 and the side walls 110 and 111. High speed gas and trapped air is formed by a combined stream of entraining gas and trapped air that flows along the web-carrying surface of the bottom 109 at a speed higher than that of the moving web 106. The speed of the entraining gas can be varied or adjusted account of the change in the magnitude of the gas pressure emitted from spruce 124. A similar device can be used to adjust the gap width, for example, using a large number of adjusting guides interacting with the foot 119. A special feature of this design is the presence of a deflecting element 114 in combination with rods 115 Together, these elements play the role of a separator located at the end of the exit of the bottom 109 and serving to separate the end of the web captured by the combined stream from the entraining gas and trapped by air. ear from most of the combined stream. Most of the combined stream of entraining gas and trapped air deflects downward after it passes through the vertical rod 115, since the upper surface of the deflecting element has a curved shape, resulting in the Kond effect and most of the combined stream sticks to this surface and goes down, i.e. removed from the system. With this design, the excess amount of gaseous flow formed by the first nozzle does not interfere with the operation of the second nozzle and does not feed the end of the web too high above the second nozzle. In addition, the end of the web will not flow down under the action of the main stream moving downward due to the presence of rods 115. Meanwhile, the end of the web continues to move by inertia and under the action of the remaining gaseous flow, which was not deflected downwards. A support arm 127 is attached to the end of the side walls 110 by means of an axis 126 by means of an axis 126, provided with a longitudinal slit 128 formed at its lower end. The lever 127 is designed to maintain the elements of the device 107 in a predetermined position relative to the drying vat 104 and the calender 105. In the constriction shown in FIG. the lower end of the lever 127 is attached to the bridge 129 of this type, which is usually installed between two nodes of a papermaking machine. The device can be fixed on any supporting structure depending on the specific working conditions. Adjustment of the support lever 127 is accomplished by means of adjusting bolts 130 and 131, passing through slots 128 and corresponding holes made in the mounting plate 132 attached to bridge 1 by the Upper the end of the support arm 127 is pivotally connected to the second segment 133 of the device 107. This lower segment contains a second bottom 134 located between two side walls, of which only one 135 is shown. The second bottom 134 sl abraded by the second canvas transferring surface and has an inlet 136 and an outlet 137-ends for the web. At the end of the 136 there is a second Kond three-dimensional nozzle, including its bracket 138 and the element 139 of olga. The second Kond nozzle is not detailed in detail, since its design is similar to the first two-dimensional Kond nozzle, which is installed on the left end of the device 1 (17. The bracket and the foil element form a limited hole in the shape of the oblong slot, and the foil element 139 has a curved surface sticking flow directed toward the second surface transferring the web - the second bottom 134. The rods 115 are positioned so that they are directed towards the element 139. Thus, the end of the web after leaving the free ends of the piece The ng 115 is located in the immediate vicinity of the element 139. Based on the fact that the gas under pressure passes through a limited opening formed by the bracket 138 and the element 139, the end of the web will be caught by the gas passing around the upper surface of the element 139. Since the second bottom 134 and the side walls interacting with it form an open channel and a groove, the surrounding air will be re-captured, and the combined gaseous stream from the entraining gas and trapped air will flow along with the end of the polo to transmit the web along poverhgosti second bottom 134. In the proposed design the gap 140 is formed in the second bottom 134, wherein the third set of the combinations of the bracket 141 and the foil member. This third Konda nozzle has basically the same design as previously described. The number of Kond nozzles used in each device design depends on the length of the movement of the end of the blade, as well as on the shape of the trajectory along which it moves. At the lower end of the segment of the device 107, by means of any appropriate bracket, a support rod 142 is hinged, which can be used in an angular position to adjust the lower segment of the device 107 around the hinge point connecting the lower segment and the support lever 127. Any locking mechanism 143 can be used to locate the supporting rod 142 relative to the bridge 129. In the position shown in FIG. 14, the lower segment of the device 107 is aimed at the gap formed by the shafts 105a and lOSf. By adjusting the support rod 142, the system can be aimed at any gap of the calender 105. Consider the operation of the device 107. Suppose that the web 106 is broken, and its end, coming out of the drying tank 104, falls down into the usual paper waste tank (not shown). The operator needs to manually guide the end to the reject tank. The device 107 is rather narrow, 5-60 cm, compared with the width of the web passing through a conventional bumping machine. Although the device can be made wide enough to make the filling of the end of the web having a full width, however, the cost of such a device increases and the process flexibility decreases. To use the narrower device 107, the operator narrows the effective width. the webs, due to the curvature of the webs, entering the reject tank have a width slightly less than the widths of the bottoms 109 and 134, which usually have the same width. When it is necessary to reestablish communication with the drying tank 104 and the calender 105, the device 107 is activated by supplying compressed gas through a supply line that interacts with the foil element 122, while almost simultaneously, the compressed gas is supplied to the Kond nozzles including elements 139 and 141 from foil. Gas passing through the confined orifice formed between bracket 116 and element 122 results in the formation of a continuously moving stream of air through the entire cavity of the first segment 108. When the gaseous flow reaches the output end 113 of the first segment 108, a significant part of it goes down along the deviation The element 114. In addition, in the cavity of the second segment 133, there is airflow (138, 139 and 143,144). The second segment 133 does not have a terminal deflecting element, similar to element 114, located on the first segment. There is no need for such a deflecting element, since the end of the device 107 is quite far from the calender to avoid a strong reverse gas flow resulting from its impact on the calender, which will interfere with the normal operation of the device 107. For relatively short distances This deflection surface can be used. After the flow has been established, the end of the blade 106 and the first Kond nozzle 116 122 are approached to remove the newly formed end from the peripheral surface of the drying tank 104. This is done by the operator turning the first segment 108 around its matting axis 126 to displace the first segment from its position usually takes place under the action of its own weight (on the phi1. 14 is shown by a dotted line), into the working position (in Fig. 14 it is indicated by solid Mie lines): The device 107 may contain auxiliary nozzles 145 and 146 for removing the web, tained on either side of the first nozzle Konda communicating with the cavity 125 and napravleynye up to the surface of the drying tank. The presence of such an additional device is desirable in cases where this system is used in combination with a drying tank or other element having a support surface for the web, as the web may adhere to the surface. After the filling end of the web 106 and the element 122 are in close proximity to each other, the gas supplied through the elongated slot 124 and passing over the foil surface, captures the filling end of the web and guides it along the bottom 109. The speed of the combined flow from the exciting gas and trapped ambient air must exceed the speed of the web so that the end of it can be transported along segment 108. The end passing through the system will be double layered until the operator tears off it was over in the vat. A significant part of the combined gaseous flow is directed along the deflecting element 114, while the end of the web moves along the rods 115 under the action of its own inertia and that part of the gaseous flow that has not been removed downwards. As a result of the continued movement, the end of the web fits in close proximity to the second Kond nozzle of the system, i.e. the nozzle formed by the bracket 138 and the element 139. The supporting rods are aimed at the second Kond nozzle. After the web end is caught by the second nozzle and captured by the compressed gas exiting it, the operator can lower the first segment 108 by rotating it around the axis of rotation 126, since this segment is no longer needed to transport the end of the web to the desired place. Removing a significant amount of gaseous flow into the atmosphere prevents the formation of a flow from the first nozzle, interfering with the correct operation of the second nozzle. If part of the flow is not removed along deflecting element 114, the end of the web may be fed too high by the second nozzle so that it can catch it. In this ray, the end begins to float or is dropped — from device 107. This is particularly the result
    changing the direction of web motion near the second nozzle.
    The design of the invention allows the use of gas under high pressure at the location of the first nozzle, without interfering with the proper operation of the rest of the device. Thus, the greater the gas pressure, the greater the ability to grip the web. In the process of capturing the web with the first nozzle, energy is required more than during the rest of the device 107 operation time.
    The combined stream of entraining gas escaping from the Kond nozzle 138, 139; and trapped ambient air passes along the second bottom 134 of the second segment 133 of the device 107. The end of the web is entrained by this flow of air provided that the velocity of the combined stream exceeds the web speed. The end of the web continues to advance until it reaches the third and last Kond nozzle 142, 141. The last nozzle restores the gaseous flow and ensures that the end of the web leaves the end of the device 107, which protrudes into the required iviecTo, i.e. in this case, the gap between the shafts 105e and the lOSf of the calender 105. The device 107 can be aimed at any of the kala.ndra gaps by adjusting the support arm 127 and the support bar 1.42, which are fixed in any desired position using the previously described locking elements. When the end of the web enters the gap between the shafts of the calender 105, it is firmly clamped, and the web enters the gap between the shafts of c-alander 105, and the operator adjusts the web width to full size.
    When the second segment 133 is endowed with the upper gaps of the calender 105, the end of the segment is located further away from the place where the end of the web is required to be directed. Poetog / 1u device 107 contains devices with the help of which its effective length can be increased by adding one or several radially extending sections. The corresponding extension section is shown as a segment 147, indicated by a dotted line (Fig. 14) when the device 107 is aimed at the uppermost gap — between the shafts. 104a and 105fe. The elongated segment 147 has a flat bottom 148, and in this construction, two vertically parallel side walls are attached to the bottom (wall 149 is shown in Fig. 14). Circular rods are attached to the side wall of the lengthening segment by welding (or otherwise), most of which extend beyond the ends of the bottom and side walls (only rod 150 is shown)
    These rods overlap the side walls of the second segment and are held by stops 151 and 152, two of which are attached to each of the side walls of the second segment by welding. Each of the stops has a semicircular shape. The lugs 152 limit the movement of the rods interacting with them upwards, while the lugs 151 restrict the movement of rods interacting with them.
    o down, when elongating segment 147 is continuously shifted down by its own weight. When segment 147. is connected to the rest of device 107 as a result
    5, when the stops and rods interact, the bottom 148 is aligned with the bottom of the second segment 133, which results in a smooth flow of air along them. However, the presence of the side walls of the extension segment is not necessary for all cases. Figures 16 and 17 show possible Kond nozzles that can be used in device 107 (the design change of nozzles is shown in conjunction with the input end of the bottom 109 of the first segment 108).
    Adaptations used to create a high-speed gaseous flow in the system may contain not one nozzle located across the entire width of the bottom 109, but several nozzles 153 installed across the entire width of the device 107 and separated by plates 154 (see Fig. 1b).
    5 Each of these nozzles or nozzle segments can be switched on and off - separately by means of appropriate valve means / interacting with each of the nozzle segments. Thus / profile
    The flow through the bottom 109 can be adjusted to the desired conditions. Each nozzle segment contains its own bracket 155 and element 156, as a result of which the entraining gas flows into
    5 system through a large number of slots 157, located in line.
    FIG. 17 shows a structure in which a single Konda nozzle comprising a bracket 158 and a foil element.
    0 159 is not located across the entire width of the bottom 109. The design of such a crucible is used in cases where the device 107 is used to transport relatively light web. In the design of FIG. i5 will be captured by less ambient air. The result is that a smaller combined gaseous stream is generated than in the above construction, provided that all the others
    0 factors, such as slot width and pressure, are the same in both cases. The structures in FIG. 16 and 17 are less susceptible to perenosation with excess gaseous
    5 than the structure shown in FIG. 14. Excessive flooding can lead to the ejection of the end of the web from the system, twisting or breakage. The orientation of the nozzle in the device has a significant effect on the holding capacity. Different positions of the nozzle relative to the bottom interacting with it give different performance characteristics. FIG. 20 schematically represents a two-dimensional nozzle used in the device, which comprises a bracket 160 and a foil member 161 having a curved surface 162 of flow adhesion. Between bracket 160 and element 161, there is a slot 163, in which speed is formed downstream from slot 163. Here, first, the velocity vector decreases as the flow advances along surface 162. Secondly, the flow is slowed down mainly due to and mixing, which leads to a rapid increase in the thickness of the jet. Thus, the boundary of the jet recedes from the surface of the nozzle. FIG. 21 shows by arrows the distribution of pressure near the gap 163, when the jet velocity is maximum and the radius of curvature of the surface is minimal. This force gradually decreases due to an increase in the radius of curvature and loss of momentum due to friction and mixing. The elongation of the current path by extending the convex surface leads to Continuous spraying and slowing the flow (similar to Fig. 18). If the web trajectory is in harmony with the curvature of the nozzle and its bottom, then the web will experience rather strong holding and driving forces acting near the leading edge. Along the nozzle in the course of the flow where the suction forces are weaker, the web will move to the interface between the stream of exciting gas and ambient air, i.e. strive to rise from the surface. In order to prevent the web from dropping, side plates with gradually increasing height are provided. The form shown in FIG. 19 (the larger axis of the two-dimensional Konda nozzle forms a convex trajectory for a web with an interacting bottom) may not be suitable for all operating conditions. So for example in FIG. 22, the charging end must be fed from the drying tank 104 along the acceleration roller 164 into the gap formed between the two shafts 165 and 166 of the calender. The trajectory of the web in the process of refueling is indicated by the letter F, the arrow C indicates the trajectory that the canvas will be occupied after it gets into the gap between the shafts of the calender. In this example, the web forms a concave trajectory during refueling. If you install a Kond nozzle N, (see Fig. 22) with a larger axis of the foil element located at an angle downward from the bottom interacting with it, then the front edge of the nozzle will be directed away from the web. Thus, the trajectory of the canvas will not completely coincide with the curvature of the element from the foil and its bottom. therefore, no maximum suction or holding force that creates the nozzle will be applied. Consequently, a significant perturbation due to poor gripping in the gap results in the filling end of the web rising and losing its speed and driving force. This can be eliminated by using a nozzle mounted as shown in Fig. 23, where the main or major axis of the foil element is positioned upwardly at an angle with respect to the bottom interacting with it to form a concave trajectory of movement for the web. In this case, the trajectory of filling F of the web coincides with the curvature of the foil element and with the surface supporting the web of the bottom cooperating with the nozzle, as a result of which the maximum holding and driving forces act on the web. Due to the concavity of the web trajectories, due to the nozzle installation at an obtuse angle, the centrifugal forces are directed towards the surface transporting the web, thereby providing a reduced exciting and compressive flow capacity (see Fig. 18). The gripping jet is becoming thinner than in the case of a convexly mounted nozzle (Fig. 19), and the web end of the web is located closer to the surface, and the device 107 operates with low side plates. The magnitude of the concavity is determined by the angle cx. (Fig. 18), which is measured between the central axial line of the foil element and the axis of the bottom that bridges with it. To obtain a maximum force holding angle, the angle θ must be slightly larger than the entrance angle of the web entrance. As a result, the filling end of the web will be subjected to maximum suction and acceleration. However, this condition is not necessary for all cases, as sometimes a vertical angle of inclination (rt-20 ° can be used) gives good working results). At large values of the angle of the shell, the charging end collides with the support surface of the bottom, which leads to the formation of large waves on the web, making it difficult for them to target the filling device. In addition, such strikes of the web create a strong noise and in a number of cases devices with large angles of cx cannot be used.
    FIG. 24 illustrates an embodiment of a device in which at least two devices 167 and 168 are used. An upstream device 167 is installed adjacent to a rotating drying vat used to dry the web 169 moving along the trajectory G under the accelerating roller. 170 to the gap formed by the shafts 171 and 172. Each of the devices 167 and 168 is an open trough-shaped guide comprising a bottom 173 and 174 and side walls attached thereto. The Kond nozzles 175 and 176 are installed, at the input ends of the groove-shaped guide and interact with the bottoms 173 and 174. The devices 167 and 168 are supported by vertical supports 177 and 178.
    The device 167 is installed with the possibility of interaction with the drying tank under the path G of the web 169, so that it can easily be used to pick up the free end of the web in the event of a break or at the beginning of the charge, when compressed gas is supplied to the device 167 in the above manner. The nozzle 175 is positioned at an angle upward relative to the bottom 173, with the result that the surface of the nozzle foil element coincides with the trajectory of the end of the web, at which the end emerges from the drying tank. The bottom of the first device is aimed at the Kond nozzle 176 of the second device, and the end of the blade protrudes into the open space. When the second device (168) is connected to a compressed air source, the end of the web is caught by the second Kond nozzle and transported along the bottom 174 interacting with it to the gap formed by the shafts 171 and 172 along the trajectory E.
    For the system to work properly (Fig. 24), the following conditions are necessary. First, an exciting gaseous flow, at least in the first device, must have a speed that exceeds the speed of the web passing through the papermaking or Other mechanism with which it interacts, secondly, the first device should be oriented in such a way so that the filling end of the web is located in the immediate vicinity of the second Kond nozzle, which grips the end and transports it. Thirdly, the first and second devices must be located at a distance from each other so that a large part of the gaseous stream in the first device is removed from the system to the atmosphere without interfering with the operation of the second Kond nozzle. Excessive flow from the first device to the location of the second Kond nozzle may cause the end of the web to deviate, as a result of which it will not be located near the second Kond nozzle. Accuracy is an important factor due to the high speeds of paper transport. It is advisable that the flow created by the second Kond nozzle has a greater velocity than the gaseous flow from the first nozzle.
    权利要求:
    Claims (5)
    [1]
    1. A device for feeding the end of the paper web in a paper machine, comprising an air nozzle mounted on the arm, characterized in that, in order to increase reliability in operation, it has a grooved guide for the web end positioned in front of the nozzle in the direction EO of the web motion, and the air The heat is made slit, located under the groove-shaped guide perpendicular to its free end and is formed by a vertical stack fixed to the bracket and a guide element for the flow air with a curved arcuate surface.
    [2]
    2. The device according to claim 1, characterized in that the trough-shaped guide consists of two parts, between which there is an additional air nozzle, one of which is. the parts are made straight, and the other part is curved, for example, arcuate.
    [3]
    3. The device according to claim 1, characterized in that the groove-like guide and the bracket for the nozzle are connected by a handle.
    [4]
    4. The device according to claim 2, wherein the straight part of the trough-like guide consists of two telescopically connected parts.
    [5]
    5. The device according to claim 2; characterized in that the curvilinear part of the trough-shaped guide has a hinged plate for deflecting the flow of air according to the change in the angle of inclination of the rectilinear part of the trough-shaped guide.
    Sources of information taken into account in the examination
    1. US patent 3066882, cl. 242-56, 1962.
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    类似技术:
    公开号 | 公开日 | 专利标题
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    同族专利:
    公开号 | 公开日
    US3999696A|1976-12-28|
    CA1038212A|1978-09-12|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/581,306|US3999696A|1975-05-27|1975-05-27|Web threading system|
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