• 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:
    HYDRAULIC SYSTEM WITH RETURN / SUCTION FILTER. The present invention relates to a hydraulic system, preferably, to pilot and actuate a pump with two cylinders of thick matter. The hydraulic system comprises a tank (68) for receiving hydraulic oil, a primary circuit that has at least one hydraulic consumer (AH, MH) that has at least one primary pump (36, 38, 61, 70) that is loaded with oil hydraulic via a first suction line (42) and is connected on the outlet side to at least one first return line and which has a return / suction filter (40) which communicates with the first suction line (42 ) on the outlet side and is loaded on the inlet side with return oil from at least one return line. A special feature of the invention is the fact that the first suction line (42) communicates with the tank (68) through a separate replacement suction line (86) and a suction filter (66) in which a suction replacement valve (88), which is preloaded towards the suction filter (66), is arranged in the replacement suction line (86).
    公开号:BR112014007470B1
    申请号:R112014007470-4
    申请日:2012-08-15
    公开日:2021-01-19
    发明作者:Jan-Martin Veit；Markus Staß；Werner Münzenmaier；Hans-Peter Renz
    申请人:Putzmeister Engineering Gmbh；
    IPC主号:
    专利说明:

    DESCRIPTION
    [001] The present invention relates to a hydraulic system, preferably, for the activation and actuation of a mobile pump of thick matter that has a tank that is at atmospheric pressure to accommodate hydraulic oil that has a primary circuit that drives by least one hydraulic consumer, where the primary circuit has at least one motor-driven primary pump that is charged with hydraulic oil through a first suction line and is connected on the outlet side to at least one first return line and where the primary circuit has a return / suction filter which communicates on the outlet side with the first suction line and which, on the inlet side, is charged with oil returned from at least one return line and which has a branch line which branches off the first suction line and flows into the tank via a pre-loading valve.
    [002] The invention differs from conventional thick matter pumps in that the return line for the primary pump and the return lines for the primary circuit do not flow into the tank and, conversely, the return line suction communicates with the outlet side of the return / suction filter, while the return lines are connected to the inlet side of the return / suction filter. This system called a return / suction filter requires an excess amount of oil in order, for example, to compensate for the amount of oil leakage that is directed directly to the tank or in order to compensate for the quantities of oil soon removed from the line. return pressure due to hydraulic oil compressibility on the pressure side. Consequently, according to the invention, a secondary circuit is proposed, in which it has at least one secondary pump driven by motor, which is charged with hydraulic oil through a second suction line and is connected on the outlet side to at least a second return line, where the second suction line communicates, preferably, with the tank through a suction filter and the second return line both flows into the tank and is connected to the inlet side return / suction filter. The amount of excess oil remaining in the return / suction filter system is directed to the tank via the pre-loading valve.
    [003] With the return / suction filter system, it is concluded that, through the excess oil quantity, in conjunction with the pre-loading valve, optimal suction conditions are obtained for the primary pumps connected to the first suction line in the primary circuit, so that the cold start behavior is improved due to the preload and the amount of oil directed through the tank is significantly reduced, in such a way that a significantly smaller tank volume can be used , thus allowing for weight reduction and cost savings in the event of an oil change.
    [004] However, it was noted that, in the case of thick matter pumps, the operation of consumers with differential cylinders, for example, during the development of vehicle supports or during the development of the boom, can lead to a considerable deficit supply in the return / suction filter system.
    [005] In order to eliminate this disadvantage, it is also proposed, according to the invention, that the first suction line communicate with the tank through a separate large refill suction line and an additional suction filter and that, In the refill suction line, a refill suction valve is pre-loaded towards the additional suction filter.
    [006] At this point, the suction filter can be used as an additional suction filter on the second suction line. A preferred refinement of the invention is that an oil cooler is arranged on at least one of the return lines. This is particularly important if the hydraulic oil is heated during operation. In addition, in a preferred improvement of the invention, it is proposed that a check valve be arranged on at least one of the return lines that are connected to the inlet side of the return / suction filter.
    [007] A preferential enhancement of the invention establishes that at least one of the primary pumps in the primary circuit is in the form of a loading and feeding pump of a pump with two cylinders of thick material that is driven by means of a reversible pump. What is now involved is a closed hydraulic circuit that is conducted through the reversible pump, in which, in the terminology of the present invention, said hydraulic circuit forms, along with the reversible pump, the consumer. In this case, one of the return lines is, for example, in the form of an oil leak line from the reversible pump. If, to increase the cooling power, the leakage of oil from the reversible pump must be carried out through an oil cooler, it may be necessary that a check valve be provided on the associated return line in order to protect the reversible pump against spikes pressure of the other return lines. In addition, it is necessary that a check valve be supplied which is connected directly to the outlet side of the return / suction filter or leads directly into the tank.
    [008] A further advantageous improvement of the invention establishes that one of the return lines is in the form of a cleaning oil line that is connected to the outlet side of a reversible pump cleaning slide valve, said line of cleaning. Cleaning oil is preferably returned to the return / suction filter via the oil cooler.
    [009] It is also possible, basically, that one of the primary hydraulic pumps is connected to the hydraulic actuating elements of a placing boom, as a consumer, the return line of the one that is connected to the inlet side of the return filter. no / suction.
    [0010] It is advantageous that one of the primary pumps or one of the secondary pumps is connected to a hydraulic stirring mechanism drive, the return line from which is connected to the inlet side of the return / suction filter. In addition, one of the secondary pumps in the secondary circuit can be connected to the hydraulic actuating elements of a tube switch or a slurry valve for the thick matter pump, the return line from which flows into the tank. In addition, it is also possible that a separate secondary hydraulic pump is supplied in the secondary circuit, which is connected with its pressure side to the inlet side of the return / suction filter and which delivers at least part of the necessary excess oil.
    [0011] In order to ensure that the return / suction filter is protected against excessively high pressure differences, it is advantageous that a check or bypass valve is arranged between the inlet side of the return / suction filter and the tank .
    [0012] The invention will be explained in more detail below, based on the exemplary modalities schematically illustrated in the drawing, in which Figures 1 and 2 show sketches of hydraulic circuit of hydraulic systems for the activation and actuation of a pump with two cylinders of matter thick with return / suction filter.
    [0013] The hydraulic circuits shown in Figures 1 and 2 are designed for a thick matter pump that has two delivery cylinders 10, 10 ', the openings with side ends 12, 12' from which they flow into a tank with supply material (not shown) and, by means of a tube switch 14, can be connected to a delivery line (not shown) alternately, during a pressure stroke. Delivery cylinders 10, 10 'are driven in opposite striking movements by means of hydraulic drive cylinders 16, 16' and hydraulic reversible pumps 18, 20 which, in the example shown, are in the form of piston pumps of type axial oscillating plate. To this end, the delivery pistons 22, 22 'are connected to the drive pistons 24, 24' of the drive cylinders 16, 16 'by means of, in each case, a piston rod 26, 26'. Between the delivery cylinders 10, 10 'and the drive cylinders 16, 16' there is a water box 28 through which the piston piston rods 26, 26 'extend.
    [0014] In the exemplary modalities shown, the actuation cylinders 16, 16 are, on the base side, loaded with hydraulic oil by means of reversible pumps 18, 20 through hydraulic lines 30, 30 ', 32, 32' of a closed main circuit and are hydraulically connected to each other at their rod side ends via an oil oscillation line 34. The direction of movement of the drive pistons 24, 24 'and the delivery pistons 22, 22'is reversed due to the oscillating plates 18 ', 20' of the reversible pumps 18, 20, in response to a reversible signal, being pivoted through its zero position and then changing the hydraulic oil delivery direction in the hydraulic lines 30, 30 ', 32, 32' of the main circuit.
    [0015] In the terminology of the present invention, the actuating cylinders 16, 16 ', accompanied by reversible pumps 18, 20, form a consumer AH (hydraulic actuating elements) of the primary circuit of the pump with two cylinders of thick material. Primary pumps 36, 38 which are in the form of loading and feeding pumps charge the AH consumer circuit through the control valves 36 ', 36 ", 38', 38". Primary pumps 36, 38 are arranged in a suction / return system that features a first suction line 42 connected to the 40 "outlet side of a return / suction filter 40 and whose oil leak lines extend from of the reversible pumps 18, 20 are connected, as return lines 44, 44 ', to the inlet 40' of the return / suction filter 40. An additional return line 46 branches off from the hydraulic drive elements AH through a cleaning slide valve 48 and a low pressure limit valve 50, and is taken back to the inlet side 40 'of the return / suction filter 40 through oil cooler 52 and line 54.
    [0016] In the primary circuit, with the return / suction filter system, an excess amount of oil is necessary to, for example, compensate for quantities of oil leakage that flow through lines 55 to tank 68 or to in order to compensate for quantities of oil removed from the return line due to the compressibility of hydraulic oil on the pressure side. The excess oil quantity is generated at least partially by means of a secondary hydraulic pump driven by an engine 60, 62 which is arranged in the secondary circuit and which is charged with hydraulic oil through at least a second suction line 58. The second suction line 58 communicates with tank 68 either directly or through a suction filter 66. On the outlet side, the secondary circuit is connected to at least one return line that both flows into tank 68 and is connected next to the inlet 40 'of the return / suction filter 40.
    [0017] The amount of excess oil remaining in the return / suction filter is conducted through a pre-loading valve 70 to the tank 68. The return / suction filter system is also provided with a check valve on the side inlet 40 'of the return / suction filter 40, whose check valve, like a bypass valve 72, protects the filter element of the return / suction filter 40 against excessively high pressure differences.
    [0018] The advantages of the return / suction filter system consist, in particular, in the fact that the excess oil quantity, in conjunction with the pre-loading valve 70, produces optimal suction conditions for the primary pumps on the primary circuit. In addition, the cold start behavior of the primary pumps is improved and the amount of oil circulating through the tank 68 is reduced. This also has the effect that the tank volume can, for example, be reduced to less than half the conventional size otherwise, and then the weight of the tank and oil and the amount of oil to be changed during a oil changes are reduced.
    [0019] In the exemplary mode shown in Figures 1 and 2, the circuit for the actuation and control of the MH placement boom is also a consumer of the primary circuit. The supply for the control of the boom is carried out by means of the additional primary pump 71, and the suction side which is connected via line 73 to the first suction line 42 at outlet 40 "of the return / suction filter 40 and through the line return 74 which is taken back to the inlet side of the return / suction filter via oil cooler 52 and line 54. The lift control that serves to support the mobile concrete pump on the ground, by means of its hydraulic-actuating support legs can also be integrated with the MH consumer by the boom control. In the case of concrete pumps of this type, the operation of consumers with differential cylinders, as they are used, for example, for the development of the support legs and the development of the boom, can lead to a considerable supply deficit in the return / suction filter system. a large quantity of excess oil which, in the secondary circuit, is recirculated in the return / suction filter 40 by means of a large secondary pump 60, 62 which is connected to the tank 68.
    [0020] In the exemplary embodiment shown in Figure 1, for this purpose, the secondary pump 60 is used, which is used to activate an RS agitation mechanism, as a consumer, arranged in the tank with supply material , the return line 76 from whose secondary pump is taken back to the inlet 40 'of the return / suction filter 40 through the oil cooler 52 and the outlet side 54. The exemplary embodiment of Figure 2 differs from Figure 1 in this Consideration that the stirring mechanism controller RS is supplied with hydraulic oil by means of a primary pump 61 through the return / suction filter 40 and the first suction line 4 and is therefore a constituent part of the primary circuit. On the contrary, in the exemplary embodiment of Figure 2, a secondary pump 62 is provided in the secondary circuit, where it is intended exclusively for the provision of the excess oil quantity, the suction side 62 'of such secondary pump communicates with the tank 68 through the second suction line 58 and the suction filter 66 and the pressure side 62 "of such a secondary pump is taken back to the inlet side 40 'of the return / suction filter 40 both through the water cooler oil 52 and line 54 as well as through check valve 78 and line 80.
    [0021] The hydraulic pump 64 for the hydraulic accumulator 82 of the tube commutator RW circuit can also be connected to the suction filter 66. The return line 84 of the tube commutator circuit RW must, however, be taken to the tank 68 separately, due to the inadmissible pressure peaks for the return / suction filter 40 that appear here.
    [0022] An additional special feature of the invention is that at least part of the excess oil quantity is supplied through a separate and properly sized refill suction line 86. In the exemplary embodiment shown, said refill suction line 86 is connected to the suction filter 66, by which the primary pumps 36, 38, 61, 70 of the primary circuit extract the hydraulic oil through a refill suction valve 88 and the first suction line 42. The suction line of refueling 86 must at least be dimensioned so that, at a maximum refueling suction rate, the flow speed in the refueling suction line does not exceed 0.8 m / s and the negative pressure does not fall below the minimum allowable value, for example , 0.08 MPa (0.8 bar), from the primary pump that provides the suction action. In addition, the refill suction line 86 and the refill suction valve 88 need to be suitably large in size, due to an operating rate that may arise, in which only the primary pump 71 of the hydraulic elements of the MH boom is in operation. operation and the drive for other hydraulic pumps is deactivated. Here, the secondary pump 60 or 62 for the excess oil quantity is out of operation as well. Depending on whether the differential cylinders on the hydraulic elements of the MH boom or on the hydraulic support elements are being developed or retracted, either an excess of oil appears in the return / suction filter 40, the excess of which is driven through the pre-loading valve 70 to the tank 68, when an oil deficit arises, which then needs to be compensated from the tank 68 through the refill suction line 86 and the refill suction valve 88 and the suction filter 66.
    [0023] The exemplary embodiment of Figure 1 additionally includes the special feature that the oil leak is conducted at least partially from the reversible pumps 18, 20 through the oil cooler 52, in order to achieve an increase in cooling power. In this case, this proved to be expedient for a check valve 90 to be provided on the oil leak line 44, 44 'in order to protect the AH consumer reversible pumps 18, 20 from pressure spikes on the other return lines. In addition, it is necessary that a check valve 92 be provided, which, on the outlet side, is connected directly to the inlet 40 'of the return / suction filter 40 or leads directly into the tank 68.
    [0024] In the summary, the following can be established: the invention refers to a hydraulic system, preferably for the activation and actuation of a pump with two cylinders of thick matter. The hydraulic system comprises a tank 68 to accommodate hydraulic oil, a primary circuit with at least one hydraulic consumer AH, MH, whose primary circuit has at least one primary pump 36, 38, 61, 70 which is charged with hydraulic oil through a first suction line 42, whose primary circuit is connected on the outlet side to at least one first return line and whose primary circuit has a return / suction filter 40 that communicates on the outlet side with the first suction line 42 and where, on the inlet side, it is loaded with oil returned from at least one return line. A special feature of the invention consists in the fact that the first suction line 42 communicates with the tank 68 through a separate refill suction line 86 and a suction filter 66, in which, in the refill suction line 86, a refill suction valve 88 is arranged, which is preloaded towards the suction filter 66. NUMERICAL REFERENCE LIST 10, 10 'Delivery cylinders 12, 12' Openings 14 Tube switch 16, 16 ' drive 18, 20 Reversible pumps 18 ', 20' Swing plates 22, 22 'Delivery pistons 24, 24' Drive pistons 26, 26 'Piston rods 28 Water tank 30, 30', 32, 32 'Hydraulic lines ( AH) 34 Oil oscillation line (AH) 36, 38 Primary pumps 40 Return / suction filter 40 'Inlet side 40 "Output side 42 First suction line 44, 44' Oil leak lines (return line ) 46 Cleaning line (return line) 48 Cleaning slide valve 50 Cleaning valve mimic low pressure 52 Oil cooler 54 Return line 55 Oil leak lines 58 Second suction line 60 Secondary pump (RS) 61 Primary pump (RS) 62 Separate secondary pump 64 Hydraulic pump 66 Suction filter 68 Tank 70 Valve pre-loading valve 71 Primary pump (MH) 72 Bypass valve 73 Suction line (MH) 74 Return line (MH) 76 stirring mechanism controller (RS) 78 Check valve 80 Return line (S, MH) 82 Hydraulic accumulator 84 Return line (RW) 86 Refill suction line 88 Refill suction valve 90 Check valve 92 AH check valve Hydraulic actuating elements (consumer) MH Hydraulic boom elements (consumer) RS mechanism controller stirrer (consumer) RN Tube changer (consumer)
    权利要求:
    Claims (6)
    [0001]
    1. Thick matter pump with a hydraulic system for its control and activation, which has two delivery cylinders (10, 10 ') that contain, in each case, a delivery piston (22, 22') and which emit in the final openings (12, 12 ') into a material supply tank and which, by means of a tube switch (14) or a thick matter pump gate valve, are connected to a delivery line alternately during a pressure stroke of its delivery pistons (22, 22 '), which has two hydraulic actuating cylinders (16, 16') which contain, in each case, a driving piston (24, 24 ') and whose drive pistons (24, 24 ') are connected to the delivery pistons (22, 22') by means of, in each case, a common piston rod (26, 26 ') and can be driven and controlled by means of elements hydraulic drives (AH) of the hydraulic system, which comprise a reversible pump (18, 20), characterized by the fact that a placing boom o can be activated and controlled by means of hydraulic boom elements (MH) of the hydraulic system, with the hydraulic actuation elements (AH) and the hydraulic elements of the boom (MH) forming a common primary circuit and also with a tank ( 68), which is at atmospheric pressure, to accommodate the hydraulic oil, the primary circuit having at least one primary pump driven by an engine (36, 38, 61, 71) which is charged with hydraulic oil through a first line suction (42), is connected on the outlet side to at least one first return line, and features a suction / return filter (40) that communicates on the outlet side with the first suction line (42) and which , on the inlet side, it is loaded with oil returned from at least one return line, at least one of the primary pumps (36, 38) is in the form of a pump for loading and feeding the hydraulic working elements (AH ) and another one of the primary pumps (71) is connected to the hydraulic elements of the boom (MH), whose return lines (74) on the inlet side are connected to the suction / return filter (40), and a branch line is provided, which is branched from the first suction line (42) and flowing into the tank (68) through a pre-loading valve (70), a secondary circuit is provided, such a secondary circuit having at least one secondary pump driven by a motor (60, 62) which is charged with hydraulic oil through a second suction line (58), and such secondary circuit is connected on the outlet side to at least a second return line, the second of which is suction line (58) communicates with the tank (68) directly or through a suction filter (66), with the second return line flowing into the tank (68) or connected to the inlet side of the suction / return filter (40), one of the secondary pumps (62) being it is connected with its pressurized side to the inlet of the suction / return filter (40) and / or one of the secondary pumps (60) is connected to an actuation of hydraulic agitation mechanism (RS), whose return line (76) is connected to the inlet side of the suction / return filter (40), the first suction line (42) communicating with the tank (68) via a separate refueling suction line (86) and a additional suction filter (66) and, in the refill suction line (86), a refill suction valve (88) is arranged, which is preloaded towards the additional suction filter (66), which it is dimensioned in such a way that an oil deficit in the primary circuit can be compensated.
    [0002]
    2. Thick matter pump according to claim 1, characterized by the fact that another one of the return lines is in the form of a cleaning oil line (46) which is connected to the outlet side of a valve cleaning slide (48) of the primary circuit.
    [0003]
    Thick matter pump according to either claim 1 or claim 2, characterized by the fact that an oil cooler (52) is arranged on at least one of the return lines leading to the suction / return filter (40 ).
    [0004]
    Thick matter pump according to any one of claims 1 to 3, characterized in that a check valve (78, 90, 92) is arranged on at least one of the return lines that are connected to the side of suction / return filter inlet (40).
    [0005]
    5. Thick matter pump according to any one of claims 1 to 4, characterized in that one of the secondary pumps (64) is connected to the hydraulic actuating elements of the tube changer (RW) or the sliding valve, whose return line (80) flows into the tank (68).
    [0006]
    Thick matter pump according to any one of claims 1 to 5, characterized in that a check or bypass valve (72) is arranged between the inlet side (40 ') of the suction / return filter (40) and the tank (68).
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    同族专利:
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    WO2013045167A2|2013-04-04|
    EP2761190B1|2017-03-08|
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    CN111608998A|2020-05-12|2020-09-01|湖北锐坤机械制造有限公司|Hydraulic control system of loader-digger for coal mine|
    法律状态:
    2018-12-11| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2020-06-16| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2020-12-08| B09A| Decision: intention to grant|
    2021-01-19| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 15/08/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102011083874A|DE102011083874A1|2011-09-30|2011-09-30|Hydraulic system with suction return filter|
    DE102011083874.0|2011-09-30|
    PCT/EP2012/065931|WO2013045167A2|2011-09-30|2012-08-15|Hydraulic system with suction/return filter|
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