• 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:
    . The present invention relates to a device for guiding a valve needle (1) at. one. force block (3), and pre-cooling thereof, which valve needle (1) is moved through at least a part of at least one melting channel (8) back and forth across the expansion surface of the force block (3), to open and close a casting inlet (4) at a mold tool (5) at injection of heated liquid plastic through the melting channel (8) by injection molding at least one plastic part (2), which force block (3) has at least two pneumatically / hydraulically / electrically driven pistons (7), which extend and move the transverse distribution surface in the force block (3) on a predetermined distance from the melting channel (8), in order to obtain a single damping of the heat. in and around the pistons (7), the upper part (9) of which valve needle (1) is connected to at least one between the shaft ends (10) of the pistons (7), where the existing elongate valve arm (6), which is moved by the pistons (7) to and from the power block (3), to control the upturned needle (1) to move straight and balanced when opening and closing the casting inlet (4).
    公开号:SE1000851A1
    申请号:SE1000851
    申请日:2010-08-21
    公开日:2012-02-22
    发明作者:Mathias Baeck
    申请人:Mathias Baeck；
    IPC主号:
    专利说明:

    The piston is arranged in direct connection with the melting channel inside the cavity, which is about +400 degrees around the valve needle, so heat must be conducted directly over to the piston, which is then exposed to temperatures above +200 degrees, which means that the piston's function is disturbed. the piston breaks quickly, whereby the piston stands at an angle and gets stuck because its diameter is too large, whereby the roof also easily tilts, which means that the valve needle soon bends and breaks. This design has proven to be complicated, expensive to manufacture and maintain, as gaskets, pistons and valve needles often need to be replaced. This leads to costly malfunctions, repairs and machine downtime, which creates delays.
    The object of the present invention is to solve the problems which exist with the above-mentioned constructions and increase the operational reliability and operating economy when injection molding a plastic part, by guiding the valve needle across a melting channel through a force block having at least two pneumatically / hydraulically / electrically driven pistons. arranged at a predetermined distance from a melting channel, to provide an intended cooling of the pistons. The upper part of the valve needle is connected to an elongate valve arm, which extends between the shaft ends of the pistons, which are moved by the pistons back and forth, to move the valve needle straight and balanced when opening and closing a casting inlet at a mold.
    Thanks to the invention, a cheap and simple technical solution has been achieved, which. increases' operational reliability, reduces maintenance costs and extends the operating time between repairs and which provides a control of a valve needle at a power block and for cooling it. When injection molding a plastic part, the valve needle is moved back and forth across the distribution surface of the power block through a part of a melting channel, to open and close a casting in a molding tool when injecting heated liquid plastic through the melting channel, so that an injection molded plastic part has a smooth plastic surface. at the casting intake. According to the invention, the power block, which is a substantially rectangular steel plate, which is about 40-90 mm thick, about 150-400 mm long and about 70-200 mm wide, has two pneumatically / hydraulically / electrically driven smaller pistons with a diameter of about 25-95 mm arranged in cylindrical holes, which extend across the spreading surface of the steel plate into the force block from its upper side at a predetermined distance from the melting channel, seen parallel to the spreading surface, on each side thereof, which becomes about + 300-400 degrees below Operation.
    The distance is about 10-50 mm from the valve needle, which is about 60-650 mm long, in order to obtain a predetermined damping of the heat in the pistons, so that gaskets in these are not burned. All dimensions depend on how big the mold is and what pressure is needed in the pistons. The pistons have shaft ends which point upwards towards an elongate valve arm which extends substantially parallel to the limiting surface. The upper part of the valve needle is connected to the main center of the valve arm. The pistons are moved back and forth simultaneously and an equal distance to and from the restriction surface in the longitudinal direction of the valve needle, to guide the valve needle equally on each side thereof, which causes the valve needle to move straight and balanced when opening and closing the casting inlet, it lasts a long time and seals' with great pressure on the plastic part. When sealing the casting inlet, a flow of liquid plastic also closes against the plastic part inside the lower part of the melting channel. In a preferred embodiment of the invention, the power block has cooling channels extending around the pistons containing circulating coolant, e.g. water, in order to further cool the pistons more efficiently, to obtain a working temperature in the pistons below +100 degrees C, in order to further extend the service life of the pistons and of these sealing gaskets. The pistons are moved with pneumatic or hydraulic power supplied with above or below pressure by means of oil or gas in ducts in the power block. The channels then have the same length and diameter in the power block, so that the pistons are allocated and return the same amount of medium at the same time, to start and stop exactly at the same time, for the valve needle to move the valve arm in a position parallel to the power block. which provides a balanced movement of the valve needle with reduced bending effect thereof. During injection molding, the molten plastic material is introduced into an insertion inlet located above the upper part of the valve needle to the melting channel, which branches up to two branches on each side of the valve needle, shaped like an up and down "Y". The two branches are reunited into an inverted "y" into a piece of melting channel, which continues down to the casting inlet, whereby. a space for movement is created: between the branches, for the movement of the valve arms when opening and closing the casting inlet. The molten channel is drilled in a piece of metal enclosing it or is made of pipes. In this way, molten plastic can be distributed symmetrically through the melt channel, past the valve arm, which then does not interfere with the allocation of plastic, through the entire melt channel. The melting channel is enclosed by a heated space which has an enclosing wall which on its inside or on the outside of the piece of metal has evenly distributed heating coils which heat the plastic material in the melting channel, the heat from the heating coils being effectively exposed to the heating coils.
    The melt channel then maintains a predetermined even working temperature of 200-400 degrees C, to give a predetermined viscosity to the plastic material.
    The piece of metal and the heated space are divided at the space for movement around a line, which is substantially parallel to the distribution surface of the power block, to access servings of gaskets, valve arms and other parts. The enclosing wall has two opposite holes made at the height of the movement space, which provides space for the movements of a substantially straight valve arm during operation.
    The invention is described in more detail with the aid of some preferred embodiments with reference to the accompanying drawings, in which Fig. 1 shows a vertical longitudinal section through a power block, Fig. 2 shows a vertical cross-section through the power block, Fig. 3 shows a view seen from above towards the power block, 4 shows a part of a valve arm's connection to the valve needle.
    As can be seen from Figures 1-3, a force block 3 is shown, which is constituted by a steel plate 31, through which a valve needle 1 is arranged, which is moved through a part of a melting channel 8 back and forth, to open and close a casting inlet 4 at a plastic part 2, at a forming tool 5. The force block 3 has two pistons 7, which extend and move at a distance from the melting channel 8 on each side thereof. The upper part 9 of the valve needle 1 is coupled to the upwardly directed shaft ends 10 of the pistons 7, to the ends 11 of an elongate valve arm 6 there, to guide the valve needle 1 as it is moved by the pistons 7 to and from the power block 3. During operation the molten plastic material is introduced. in an insertion inlet 16 to the melting channel 8, which branches up to two branches 15, on each side of the valve needle 1, which is reunited to a melting channel 8, which only there encloses the valve needle 1, which it makes down to the casting inlet 4. The melting channel 8 is drilled in an enclosing piece of metal 29. A space for movement 17 is created between the branches 15, to make room there for the movement of the valve arm 6.
    The valve center 6 main center 13 is connected to the upper part 9 of the valve needle 1. The valve arm 6 extends across the longitudinal direction 12 of the valve needle 1. Inside the power block 3 there are cooling channels 14, extending around the pistons 7, to cool the pistons 7. These are moved pneumatically or hydraulically with oil or a gas medium, which is assigned to channels 28 in the power block 3. The channels 28 have the same length and diameter.
    The melt channel 8 from the inlet inlet is enclosed by a heated space 19, which has an enclosing wall 25 which is part of the power block 3. The heated space 19 has evenly distributed heating loops 20.
    The piece of metal 29 and the heated space 19 are openably divided at the space for movement 17. The enclosing wall 25, at the height of the space for movement 17, has two opposite holes 30, to make room for the movement of the valve arms 6. The immediate circumference 24 of the two pistons 7 is arranged at a distance of at least 25 mm from the nearest enclosing wall 25, so that the pistons 7 are cooled by the circulating liquid in the cooling channels 14 to a maximum of 60 degrees C, in order to reduce wear on the gaskets. around the pistons 7.
    Under the valve arm 6, the valve needle: 1 lower part 18, when the valve arm 6 is moved, is guided by one around the lower part 18, under the force block 3, where the existing enclosing guide element 27, in order to. further guide the valve needle 1 so that it stays straight and reliable. The guide element 27 is enclosed by a cladding wall 26, which on its inside has the heating loops 20, in order to achieve an even heating of the liquid plastic all the way down to the casting inlet 4.
    As can be seen from Fig. 4, the upper part 9 of the valve needle 1 is shown, which has a skull 21 with a diameter which is larger than the diameter of the upper part 9 of about 2-12 mm, which is enclosed by the grinding bracket 22, resting against the upper side of the valve arm 6. 23, against a recess 33 present therein, which encloses the skull 21, and an overhead screwed-in stop screw 32, to fix the position 21. The grinding washer 22 is finely ground to the desired thickness to determine the exact position of the lower part 18, to create a even surface of the plastic part 2 at the casting inlet 4. On the head 21 is a damping gasket, to dampen a stop of movement and a start of movement of the valve needle 1.
    权利要求:
    Claims (10)
    [1]
    Device for guiding a valve needle (1) at a power block (3), and for cooling it, which valve needle (1) is moved through at least a part of at least one melting channel (8) back and forth across the power block (3). ) spreading surface, for opening and closing a casting inlet (4) at a mold tool (5) when injecting heated liquid plastic through the melting channel (8) when injection molding at least one plastic part (2), characterized in that the force block (3) has' at least two. pneumatically / hydraulically / electrically driven pistons (7) extending and moving across the distribution surface of the power block (3) at a predetermined distance from the melting channel (8), in order to obtain a damping of the heat in and around the pistons (7), which valve upper part (9), upper part (9) is connected to at least one between the shaft ends (10) of the pistons (7), where the existing elongate valve arm (6), which is moved by the pistons (7) to and from the power block (3), to guide the valve needle (1) to move straight and balanced when opening and closing the casting inlet (4).
    [2]
    2.. Device according to claim 1, characterized in that the force block (3) consists of at least one steel plate (31), which molten plastic material is introduced into an insertion inlet (16) to the melting channel (8), which branches up to two branches (15). ), on each side of the valve needle (1), shaped like an up and down nerve "Y", which two branches (15) are reunited into an upright "y" to a melting channel (8), which there encloses the valve needle (1) down to the casting inlet (4), which melting channel (8) is drilled in an enclosing piece of metal (29) or consists of pipes, a movement space (17) being created, to make room between the branches (15) for the valve arm (6). movement when opening and closing the casting inlet (4).
    [3]
    Device (1) according to claim 1, characterized in that the shaft ends (10) are connected substantially in the ends (11) of the valve arm (6), which are moved from and against the force block (3) with the valve arm (6) extending parallel with the distribution surface of the power block (3), which main center (13) of the valve arm (6) is connected to the upper part (9) of the valve needle (1), which valve arm (6) extends across the longitudinal direction (12) of the valve needle (1).
    [4]
    4.. Device according to claim 1, characterized in that the power block (3) around the pistons (7) has cooling channels (14) arranged, for cooling the pistons (7) containing circulating coolant, e.g. water, to obtain a working temperature in the pistons (7) below +100 degrees C, to prolong the service life of the pistons (7) where sealing gaskets.
    [5]
    5.. Device according to claim 1, characterized in that the upper part (9) has a skull (21) with a diameter which is larger than the diameter of the upper part (9), which is enclosed by a sanding tray (22), resting against the upper side (23) of the valve arm (6), against a recess (33) arranged in a hole (34), which encloses the head (21), in which recess (33) above the head (21) a stop screw (32) is screwed in, to fix the position (21) of the head, the grinding washer (22) fine-tuning the effective length of the valve needle (1) when fine grinding, the lower part (18) of the valve needle (1) relative to the casting inlet (4) being adjustable by fine grinding to a substantially exactly the desired position.
    [6]
    6.. Device according to claim 1, characterized in that the pistons (7) are moved pneumatically or hydraulically with oil or a gas medium, which is assigned in channels (28) in the power block (3) to and from the pistons (7), which channels (28 ) has the same length and diameter in the power block (3), so that the pistons (7) at the same time are assigned and return the same amount of medium, to start and stop exactly at the same time, for the valve needle (1) to move the valve arm (6) in a parallel position with the distribution surface of the power block (3).
    [7]
    Device according to claims 2 and 5, characterized in that the entire melting channel (8) from the inlet inlet (16) down to the lower part (18) (19), enclosed by at least one heated space (25), is having at least an enclosing wall which heated space has evenly distributed heating coils (20), which heat the plastic material in the melting channel (8) and maintain a predetermined working temperature 200-400 degrees C, to give a predetermined viscosity to the plastic material, which metal piece (29) and heated space (19) is openably divided at the movement space (17), in order to be able to service gaskets, valve arms (6) etc., which enclosing wall (25) at the height of the movement space (17) has two opposite holes (30), in order to provide space for the movement of a substantially straight valve arm (6).
    [8]
    Device (1) according to claim 7, characterized in that under the valve arm (6), under the upright Y, the lower part (18) of the valve needle (1), when the valve arm (6) is moved, controls one around the lower part (18), below the power block (3), where existing and enclosing control elements (27).
    [9]
    9.. Device according to claim 4, characterized in that the nearest circumference (24) of the two pistons (7) is arranged at a distance of at least 25 mm from the nearest enclosing wall (25) so that the pistons (7) at at least one place cool to a maximum of 100 degrees C.
    [10]
    Device according to Claims 4 and 8, characterized in that the guide element (27) is enclosed by at least one cladding wall (26), which on its inside has the heating coils (20).
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    同族专利:
    公开号 | 公开日
    SE535408C2|2012-07-24|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1000851A|SE535408C2|2010-08-21|2010-08-21|Device for guiding a valve needle through a power block included in an injection molding tool|SE1000851A| SE535408C2|2010-08-21|2010-08-21|Device for guiding a valve needle through a power block included in an injection molding tool|
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