CN104533741A - Servo control variable piston pump and control method thereof - Google Patents
Servo control variable piston pump and control method thereof Download PDFInfo
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- CN104533741A CN104533741A CN201410849262.5A CN201410849262A CN104533741A CN 104533741 A CN104533741 A CN 104533741A CN 201410849262 A CN201410849262 A CN 201410849262A CN 104533741 A CN104533741 A CN 104533741A
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Abstract
A servo control variable piston pump comprises a shell. A valve body is installed at the lower end of the shell. An oil supplementary pump is installed on the valve body in a fastened mode. A transmission flange is installed at the upper end of a driving shaft. The middle of the driving shaft is installed inside the shell through a ball bearing in a supported mode. The lower end of the driving shaft is installed inside a sliding bearing. The sliding bearing is installed inside the valve body. A bottom crescent bearing and a top crescent bearing for installation of a swash plate are arranged on the shell. A piston assembly is pressed on the swash plate through a pressure plate. An oil distribution disc is installed on the valve body. A cylinder body is pressed on the oil distribution disc. A variable cylinder body is installed inside the shell. A center shaft penetrates through the variable cylinder body. A reset assembly is arranged at the right end of an inner cavity of the variable cylinder body. A sliding block is arranged on one side of the reset assembly so that the swash plate can be prevented from being inclined. A servo control valve is installed on the shell. The displacement can be changed in real time by controlling the servo control valve, so that the operating difficulty is effectively lowered, and the various system requirements are met; in addition, a safety control device is further arranged on the valve body and used for overload protection during oil pumping.
Description
Technical field
The present invention relates to plunger pump control technique field, particularly relate to a kind of servocontrol Variable plunger pump and controlling method thereof.
Background technique
Oil hydraulic pump is as the power unit of hydraulic system most critical, and the quality of its performance directly affects the characteristic of whole hydraulic system.Current constant pressure variable displacement pump not only system complex, and it is large to control difficulty; Variable cylinder body is without under external control effect simultaneously, keeps geo-stationary characteristic poor, causes oil hydraulic pump can not stop pump oil in time, is in zero-bit state; And the assembly arranged in variable cylinder body needs lubrication after long-play, to maintain normal operation, if increase lubricating function certainly will increase cost of production on existing plunger pump, also the load of oil hydraulic pump will be increased, and because of oil hydraulic pump be that mechanical energy is converted to hydraulic energy, easily produce overload in running middle pump body, how improving Safety performance is also the problem that can not be ignored; Existing plunger pump level of integration is low, and flexible Application characteristic is in systems in which poor, can not meet the needs of modern height integrated system.
Summary of the invention
Technical problem solved by the invention is to provide a kind of servocontrol Variable plunger pump and controlling method thereof, to solve the shortcoming in above-mentioned background technology.
Technical problem solved by the invention realizes by the following technical solutions:
Servocontrol Variable plunger pump, comprises housing, and wherein, housing lower end is provided with valve body, and slippage pump is fastening to be installed on valve body; Driving shaft upper end is provided with drive flange, and drive driving shaft to rotate for transferring power, middle part is installed in housing by ball bearings, and lower end is installed in sliding bearing, and sliding bearing is installed in valve body by plain bearing housing; And the bottom crescent moon bearing be provided with on housing for installing swash plate and top crescent moon bearing, swash plate is installed on housing by bottom crescent moon bearing and top crescent moon bearing, plunger assembly is pressed on swash plate by platen, oil distribution casing is installed on valve body, cylinder body is pressed on oil distribution casing, variable cylinder body is installed in housing, and its two ends are provided with left end cap and right end cap, by install left end cap and right end cap variable cylinder body is sealed, central shaft is through variable cylinder body, and its one end loads in right end cap; Variable cylinder intracoelomic cavity right-hand member is provided with reset assembly, and slide block is arranged on reset assembly side, and pilot valve is installed on housing, and servo feedback bar inserts in variable cylinder body through housing, for the side-to-side movement of feedback controling variable cylinder body; In addition, valve body is also provided with safety control.
In the present invention, housing is provided with the locating stud for carrying out relative positioning to valve body.
In the present invention, slippage pump is installed on valve body by slippage pump clamping bolt is fastening.
In the present invention, driving shaft and housing and external interface place are provided with the outside framework oil seal for sealing.
In the present invention, reset assembly comprises master reset spring, spring-assisted reduction, spring seat and spring cup, wherein, master reset spring and spring-assisted reduction are set on central shaft, and master reset spring is connected with spring seat with spring-assisted reduction one end, the other end is connected with spring cup, and is provided with on spring cup for carrying out spacing hole back-up ring to master reset spring and spring-assisted reduction, and semicircle back-up ring is installed on central shaft.
In the present invention, pilot valve is installed on housing by servovalve perpendicular fastener screw and servovalve side direction fastening screw trip bolt.
In the present invention, safety control comprises the low pressure relief valve be arranged on valve body, bottom high-pressure relief valve and top high-voltage relief valve, for the safety of control system.
In the present invention, central shaft is provided with step.
In the present invention, splined shaft is provided with in slippage pump.
In the present invention, variable cylinder body right-hand member is provided with internal holes back-up ring.
Servocontrol variable piston method for controlling pump, concrete steps are as follows:
Under outside dynamic action, driving shaft is driven to rotate by drive flange, driving shaft drives cylinder body and plunger assembly to rotate by spline, splined shaft simultaneously by arranging in slippage pump drives slippage pump pump oil, the oil duct that the pressure oil that slippage pump pumps is arranged on valve body and housing is delivered to servocontrol valve inlet, pilot valve is normally off, when outside without when handling, pressure oil cannot be delivered to follow-up relevant execution components and parts, the pressure oil of slippage pump is through low pressure relief valve off-load, now under the effect of master reset spring and spring-assisted reduction pretightening force, variable cylinder body keeps geo-stationary, and without heeling condition about being in relatively by slide block control swash plate, now pump displacement is zero, plunger assembly and cylinder body are without relative movement, stop pump oil,
When external control controls the spool left rotation and right rotation in pilot valve, pressure oil can distinguish left end die cavity or the right-hand member die cavity of entering variable cylinder body, when pressure oil enters right-hand member die cavity, promote variable cylinder body left lateral, the pressure oil of left end to return and by relevant oil duct off-load through oil circuit, and oil is covered on variable cylinder body and associated components thereof, play lubrication, now the power of master reset spring and spring-assisted reduction is discharged on the spring seat that withstands on central shaft step, the right-hand member internal holes back-up ring of variable cylinder body is by spring cup compression master reset spring and spring-assisted reduction, under the effect of variable cylinder body and by slide block drive swash plate rotate through several angle, meanwhile, variable cylinder body rotates with servo feedback bar, progressively trend closes the pilot pressure oil passage of pilot valve, so far pilot pressure oil stops the promotion to variable cylinder body, variable cylinder body stops the effect to slide block and swash plate, swash plate is parked in current oblique position, when in real time handling the Spool rotating angle on rotating servo control valve, real time rotation is crossed corresponding angle by swash plate, in like manner, when pressure oil enters left end die cavity, promote variable cylinder body right lateral, the pressure oil of right-hand member to return and by relevant oil duct off-load through oil circuit, and oil is covered on variable cylinder body and associated components thereof, play lubrication, the hole back-up ring of variable cylinder body right-hand member inside now departs from the effect to spring cup, and the power of master reset spring and spring-assisted reduction is discharged on installation semicircle back-up ring on center shaft by spring cup, variable cylinder body is by spring seat compression master reset spring and spring-assisted reduction, under the effect of variable cylinder body and by slide block drive swash plate rotate through several angle, meanwhile, variable cylinder body rotates with servo feedback bar, progressively trend closes the pilot pressure oil passage of pilot valve, so far pilot pressure oil stops the promotion to variable cylinder body, variable cylinder body stops the effect to slide block and swash plate, swash plate is parked in current tilt position, when in real time handling the Spool rotating angle on rotating servo control valve, real time rotation is crossed corresponding angle by swash plate, and when variable cylinder running body is to relative position, slippage pump continues pump oil, to ensure the relative position of variable cylinder body, pressure oil is by low pressure relief valve off-load,
The inclination of swash plate makes plunger assembly and cylinder body produce relative movement in rotary course; plunger assembly moves back and forth in cylinder body; namely complete and inhale force feed process; swash plate from the state of turning clockwise change into be rotated counterclockwise state time; former inlet port is changed into force feed mouth by correspondence, and former force feed mouth changes into inlet port, and this is two-way pump oil; two hydraulic fluid ports are separately installed with bottom high-pressure relief valve and top high-voltage relief valve, for overload protection during force feed.
Beneficial effect: the present invention is easy and simple to handle by pilot valve controlled variable, in variable cylinder body, be provided with reset assembly simultaneously, under the effect of initial tension of spring, variable cylinder body keeps geo-stationary, without heeling condition about being in relatively by slide block controlled variable swash plate, timely hydraulic control pump stops pump oil; Pressure oil returns by drainback passage off-load through oil circuit simultaneously, and is covered on variable cylinder body and associated components thereof by oil, plays lubrication; In addition, by handling the Spool rotating angle changing pilot valve, can change discharge capacity in real time, effectively reduce operation easier, system response characteristic is good, highly sensitive, and is provided with safety control on valve body, for overload protection during force feed; Complete machine level of integration is high, is applicable to the demand of sorts of systems.
Accompanying drawing explanation
Fig. 1 is the plan view of preferred embodiment of the present invention.
Fig. 2 is the plan view of preferred embodiment of the present invention.
Fig. 3 is the rear view of preferred embodiment of the present invention.
Fig. 4 is the left view of preferred embodiment of the present invention.
Fig. 5 is the sectional view of preferred embodiment of the present invention.
Fig. 6 is the cylinder body sectional view in preferred embodiment of the present invention.
Fig. 7 is the schematic diagram of preferred embodiment of the present invention.
Fig. 8 is the clockwise tilt boundary schematic diagram of swash plate in preferred embodiment of the present invention.
Fig. 9 is the counterclockwise tilt boundary schematic diagram of swash plate in preferred embodiment of the present invention.
Embodiment
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the present invention further.
See the servocontrol Variable plunger pump of Fig. 1 ~ Fig. 6, comprise outside framework oil seal 1, bottom crescent moon bearing 2, swash plate 3, platen 4, plunger assembly 5, cylinder body 6, oil distribution casing 7, drive flange 8, slippage pump 9, valve body 10, pilot valve 11, housing 12, variable cylinder body 13, central shaft 14, slide block 15, top crescent moon bearing 16, ball bearing 17, driving shaft 18, left end cap 19, master reset spring 20, spring-assisted reduction 21, right end cap 22, spring seat 23, bottom high-pressure relief valve 24, valve body clamping bolt 25, top high-voltage relief valve 26, low pressure relief valve 27, slippage pump clamping bolt 28, spring cup 29, servo feedback bar 30, servovalve perpendicular fastener screw 31, servovalve side direction fastening screw trip bolt 32, locating stud 33 and semicircle back-up ring 34.
In the present embodiment, all integrated designs of pump are on housing 12, the valve body 10 of lower end is by locating stud 33 and housing 12 relative positioning, and it is fastening by valve body clamping bolt 25, slippage pump 9 is installed on valve body 10 by slippage pump clamping bolt 28 is fastening, being supported by ball bearing 17 in the middle part of driving shaft 18 is installed in housing 12, one end is installed in sliding bearing, and sliding bearing is installed in valve body 10 by plain bearing housing, be exposed to housing 12 outside and drive flange 8 is installed, driving shaft 18 is driven to rotate for transferring power, and it is fastening by associated component, swash plate 3 is installed on housing 12 by bottom crescent moon bearing 2 and top crescent moon bearing 16, plunger assembly 5 is pressed on swash plate 3 by platen 4, oil distribution casing 7 is installed on valve body 10, cylinder body 6 is crushed on oil distribution casing 7 by associated component, driving shaft 18 and housing 12 are sealed by outside framework oil seal 1 with external interface place, variable cylinder body 13 is installed in housing 12, and sealing is installed respectively by left end cap 19 and right end cap 22 in two ends, central shaft 14 is through variable cylinder body 13, one end loads in right end cap 22, variable cylinder body 13 inner chamber right-hand member is provided with master reset spring 20, spring-assisted reduction 21, the reset assembly that spring seat 23 and spring cup 29 form, slide block 15 is arranged on reset assembly side, pilot valve 11 is installed on housing 12 by servovalve perpendicular fastener screw 31 and servovalve side direction fastening screw trip bolt 32, and servo feedback bar 30 inserts in variable cylinder body 13 through housing 12, for the side-to-side movement of feedback controling variable cylinder body 13, be installed on the low pressure relief valve 27 on valve body 10, bottom high-pressure relief valve 24 and top high-voltage relief valve 26 are for the safety control of system.
Shown in Figure 7, external impetus drives driving shaft 18 to rotate by drive flange 8, driving shaft 18 drives cylinder body 6 and plunger assembly 5 to rotate by spline, drive slippage pump 9 pump oil by slippage pump 9 female splined shaft simultaneously, the oil duct of the pressure oil that slippage pump 9 pumps on valve body 10 and housing 12 is delivered to the entrance of pilot valve 11, pilot valve 11 is normally off, when outside without when handling, pressure oil cannot be delivered to follow-up relevant execution components and parts, the pressure oil of slippage pump 9 is through low pressure relief valve 27 off-load, now under the effect of master reset spring 20 and spring-assisted reduction 21 pretightening force, variable cylinder body 13 keeps geo-stationary, and by slide block 15 control swash plate 3 be in relatively left and right without heeling condition, now pump displacement is zero, plunger assembly 5 and cylinder body 6 are without relative movement, stop pump oil,
When external control controls the spool left rotation and right rotation in pilot valve 11, pressure oil can distinguish left end die cavity or the right-hand member die cavity of entering variable cylinder body 13, when high voltage control pressure oil enters right-hand member die cavity, promote variable cylinder body 13 left lateral, the pressure oil of left end to return and by relevant oil duct off-load through oil circuit, and oil is covered on variable cylinder body 13 and associated components thereof, play lubrication, now the power of master reset spring 20 and spring-assisted reduction 21 is discharged on the spring seat 23 that withstands on central shaft 14 step, the internal holes back-up ring of variable cylinder body 13 right-hand member compresses master reset spring 20 and spring-assisted reduction 21 by spring cup 29, under the effect of variable cylinder body 13, drive swash plate 3 to rotate through several angle by slide block 15, meanwhile, variable cylinder body 13 rotates with servo feedback bar 30, progressively trend closes the pilot pressure oil passage of pilot valve 11, so far pilot pressure oil stops the promotion to variable cylinder body 13, variable cylinder body 13 stops the effect to slide block 15 and swash plate 3, swash plate 3 is parked in current oblique position, when in real time handling the Spool rotating angle on rotating servo control valve 11, real time rotation is crossed corresponding angle by corresponding swash plate 3, equally, when pilot pressure oil enters left end, promote variable cylinder body 13 right lateral, the pressure oil of right-hand member to return and by relevant oil duct off-load through oil circuit, and oil is covered on variable cylinder body 13 and associated components thereof, play the effect of lubrication, the internal holes back-up ring of variable cylinder body 13 right-hand member now departs from the effect to spring cup 29, now the power of master reset spring 20 and spring-assisted reduction 21 is discharged on installation semicircle back-up ring 34 on a central shaft 14 by spring cup 29, variable cylinder body 13 compresses master reset spring 20 and spring-assisted reduction 21 by spring seat 23, under the effect of variable cylinder body 13, drive swash plate 3 to rotate through several angle by slide block 15, meanwhile, variable cylinder body 13 rotates with servo feedback bar 30, progressively trend closes the pilot pressure oil passage of pilot valve 11, so far pilot pressure oil stops the promotion to variable cylinder body 13, variable cylinder body 13 stops the effect to slide block 15 and swash plate 3, swash plate 3 is parked in current tilt position, when in real time handling the Spool rotating angle on rotating servo control valve 11, real time rotation is crossed corresponding angle by corresponding swash plate 3, when variable cylinder body 13 moves to relative position, slippage pump 9 continues pump oil, to ensure the relative position of variable cylinder body 13, and pressure oil is by low pressure relief valve 27 off-load,
Shown in Fig. 8 and Fig. 9; the inclination of swash plate 3 makes plunger assembly 5 and cylinder body 6 produce relative movement in rotary course; plunger assembly 5 moves back and forth in cylinder body 6; namely complete and inhale force feed process; swash plate 3 from the state of turning clockwise change into be rotated counterclockwise state time; may correspond to and former inlet port is changed into force feed mouth; original force feed mouth changes into inlet port; this is two-way pump oil; two hydraulic fluid ports are separately installed with bottom high-pressure relief valve 24 and top high-voltage relief valve 26, for overload protection during force feed.
More than show and describe basic principle of the present invention and major character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (10)
1. servocontrol Variable plunger pump, comprises housing, it is characterized in that, housing lower end is provided with valve body, and slippage pump is fastening to be installed on valve body; Driving shaft upper end is provided with drive flange, and drive driving shaft to rotate for transferring power, middle part is installed in housing by ball bearings, and lower end is installed in sliding bearing, and sliding bearing is installed in valve body by plain bearing housing; And the bottom crescent moon bearing be provided with on housing for installing swash plate and top crescent moon bearing, swash plate is installed on housing by bottom crescent moon bearing and top crescent moon bearing, plunger assembly is pressed on swash plate by platen, oil distribution casing is installed on valve body, cylinder body is pressed on oil distribution casing, and variable cylinder body is installed in housing, and its two ends are provided with left end cap and right end cap, central shaft is through variable cylinder body, and its one end loads in right end cap; Variable cylinder intracoelomic cavity right-hand member is provided with reset assembly, and slide block is arranged on reset assembly side, and pilot valve is installed on housing, and servo feedback bar inserts in variable cylinder body through housing; In addition, valve body is also provided with safety control.
2. servocontrol Variable plunger pump according to claim 1, is characterized in that, housing is provided with the locating stud for carrying out relative positioning to valve body.
3. servocontrol Variable plunger pump according to claim 1, is characterized in that, driving shaft and housing and external interface place are provided with the outside framework oil seal for sealing.
4. servocontrol Variable plunger pump according to claim 1, it is characterized in that, reset assembly comprises master reset spring, spring-assisted reduction, spring seat and spring cup, wherein, master reset spring and spring-assisted reduction are set on central shaft, and master reset spring is connected with spring seat with spring-assisted reduction one end, the other end is connected with spring cup, and be provided with on spring cup for carrying out spacing hole back-up ring to master reset spring and spring-assisted reduction, semicircle back-up ring is installed on central shaft.
5. servocontrol Variable plunger pump according to claim 1, is characterized in that, pilot valve is installed on housing by servovalve perpendicular fastener screw and servovalve side direction fastening screw trip bolt.
6. servocontrol Variable plunger pump according to claim 1, is characterized in that, safety control comprises the low pressure relief valve be arranged on valve body, bottom high-pressure relief valve and top high-voltage relief valve.
7. servocontrol Variable plunger pump according to claim 1, is characterized in that, central shaft is provided with step.
8. servocontrol Variable plunger pump according to claim 1, is characterized in that, be provided with splined shaft in slippage pump.
9. servocontrol variable piston method for controlling pump, is characterized in that, concrete steps are as follows:
Under outside dynamic action, driving shaft is driven to rotate by drive flange, driving shaft drives cylinder body and plunger assembly to rotate by spline, splined shaft simultaneously by arranging in slippage pump drives slippage pump pump oil, the oil duct that the pressure oil that slippage pump pumps is arranged on valve body and housing is delivered to servocontrol valve inlet, pilot valve is normally off, when outside without when handling, the pressure oil of slippage pump is through low pressure relief valve off-load, now under the effect of master reset spring and spring-assisted reduction pretightening force, variable cylinder body keeps geo-stationary, and without heeling condition about being in relatively by slide block control swash plate, now pump displacement is zero, plunger assembly and cylinder body are without relative movement, stop pump oil,
When external control controls the spool left rotation and right rotation in pilot valve, pressure oil can distinguish left end die cavity or the right-hand member die cavity of entering variable cylinder body, when pressure oil enters right-hand member die cavity, promote variable cylinder body left lateral, the pressure oil of left end to return and by relevant oil duct off-load through oil circuit, and oil is covered on variable cylinder body and associated components thereof, play lubrication, now the power of master reset spring and spring-assisted reduction is discharged on the spring seat that withstands on central shaft step, the right-hand member internal holes back-up ring of variable cylinder body is by spring cup compression master reset spring and spring-assisted reduction, under the effect of variable cylinder body and by slide block drive swash plate rotate through several angle, meanwhile, variable cylinder body rotates with servo feedback bar, progressively trend closes the pilot pressure oil passage of pilot valve, so far pilot pressure oil stops the promotion to variable cylinder body, variable cylinder body stops the effect to slide block and swash plate, swash plate is parked in current oblique position, when in real time handling the Spool rotating angle on rotating servo control valve, real time rotation is crossed corresponding angle by swash plate, in like manner, when pressure oil enters left end die cavity, promote variable cylinder body right lateral, the pressure oil of right-hand member to return and by relevant oil duct off-load through oil circuit, and oil is covered on variable cylinder body and associated components thereof, play lubrication, the hole back-up ring of variable cylinder body right-hand member inside now departs from the effect to spring cup, and the power of master reset spring and spring-assisted reduction is discharged on installation semicircle back-up ring on center shaft by spring cup, variable cylinder body is by spring seat compression master reset spring and spring-assisted reduction, under the effect of variable cylinder body and by slide block drive swash plate rotate through several angle, meanwhile, variable cylinder body rotates with servo feedback bar, progressively trend closes the pilot pressure oil passage of pilot valve, so far pilot pressure oil stops the promotion to variable cylinder body, variable cylinder body stops the effect to slide block and swash plate, swash plate is parked in current tilt position.
10. servocontrol variable piston method for controlling pump according to claim 9, it is characterized in that, when in real time handling the Spool rotating angle on rotating servo control valve, real time rotation is crossed corresponding angle by swash plate, when variable cylinder running body is to relative position, slippage pump continues pump oil, and to ensure the relative position of variable cylinder body, pressure oil is by low pressure relief valve off-load; The inclination of swash plate makes plunger assembly and cylinder body produce relative movement in rotary course; plunger assembly moves back and forth in cylinder body; namely complete and inhale force feed process; swash plate from the state of turning clockwise change into be rotated counterclockwise state time; former inlet port is changed into force feed mouth by correspondence; former force feed mouth changes into inlet port, and this is two-way pump oil, and realizes overload protection by bottom high-pressure relief valve and top high-voltage relief valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410849262.5A CN104533741A (en) | 2014-12-30 | 2014-12-30 | Servo control variable piston pump and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410849262.5A CN104533741A (en) | 2014-12-30 | 2014-12-30 | Servo control variable piston pump and control method thereof |
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| CN104533741A true CN104533741A (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410849262.5A Pending CN104533741A (en) | 2014-12-30 | 2014-12-30 | Servo control variable piston pump and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107842537A (en) * | 2017-12-11 | 2018-03-27 | 徐工集团工程机械有限公司 | End cap assembly, hydraulic test and engineering machinery |
| CN113898573A (en) * | 2021-10-14 | 2022-01-07 | 烟台杰瑞石油装备技术有限公司 | Flange structure and plunger pump |
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| CN107842537A (en) * | 2017-12-11 | 2018-03-27 | 徐工集团工程机械有限公司 | End cap assembly, hydraulic test and engineering machinery |
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Application publication date: 20150422 |
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