CN218669688U - Plunger type hydraulic pump - Google Patents
Plunger type hydraulic pump Download PDFInfo
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- CN218669688U CN218669688U CN202222737582.4U CN202222737582U CN218669688U CN 218669688 U CN218669688 U CN 218669688U CN 202222737582 U CN202222737582 U CN 202222737582U CN 218669688 U CN218669688 U CN 218669688U
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- plunger
- swash plate
- hydraulic pump
- type hydraulic
- end cover
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Abstract
The utility model relates to the technical field of hydraulic pressure, especially, relate to a plunger type hydraulic pump. The reciprocating type hydraulic cylinder comprises a cylinder body, a plunger, a sliding shoe, a swash plate, a return plate, a driving shaft, a shell and an end cover, wherein the plunger is arranged in the cylinder body and can reciprocate in the cylinder body; the sliding shoes are hinged with the plunger; the swash plate is arranged at one end of the cylinder body, and the sliding shoes can be tightly pressed on the swash plate; the return disc is arranged between the swash plate and the plunger, and the return disc can tightly press the sliding shoes on the swash plate; the driving shaft penetrates through the cylinder body and is in transmission connection with the cylinder body, and the driving shaft rotatably penetrates through the swash plate and the return plate; the shell is connected with the end cover, the driving shaft is rotatably connected with the shell, the end cover is provided with a low-pressure oil suction oil duct and a rear wall far away from the shell, and the low-pressure oil suction oil duct penetrates through the rear wall. The low-pressure oil suction duct penetrates through the rear wall, and a low-pressure oil inlet pipe communicated with the low-pressure oil suction duct can be arranged on the rear wall of the end cover, so that the radial volume of the plunger type hydraulic pump is not occupied, and the requirement of compact arrangement space of the plunger type hydraulic pump is met.
Description
Technical Field
The utility model relates to the technical field of hydraulic pressure, especially, relate to a plunger type hydraulic pump.
Background
In the actual work process of large-scale hydraulic pump, because work needs, need arrange a plurality ofly usually, but when the hydraulic pump is arranging the in-process, if the oil absorption mouth arranges in the periphery of oil absorption pump, and the diameter of the oil pipe of being connected with the oil absorption mouth is great, then can cause the space demand of arranging of hydraulic pump also bigger, especially when a plurality of hydraulic pumps are the star type and arrange, the system is bulky, and occupation space is also big.
Therefore, a hydraulic pump is needed to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a plunger type hydraulic pump can reduce the hydraulic pump and wholly arrange the volume, reduces the occupation space of hydraulic pump.
To achieve the purpose, the utility model adopts the following technical proposal:
a plunger-type hydraulic pump comprising:
a cylinder body;
a plunger disposed in the cylinder and capable of reciprocating in the cylinder;
a sliding shoe hinged with the plunger;
a swash plate which is provided at one end of the cylinder block and to which the shoes can be pressed;
a return disc provided between the swash plate and the plunger, the return disc being capable of pressing the shoe against the swash plate;
the driving shaft penetrates through the cylinder body and is in transmission connection with the cylinder body, the driving shaft is rotatably penetrated through the swash plate and the return plate, and the driving shaft can drive the cylinder body to rotate;
the hydraulic oil cylinder comprises a shell and an end cover, wherein the shell is connected with the end cover, a driving shaft is connected with the shell in a rotating mode, the cylinder body, a plunger, a sliding shoe, a swash plate and a return disc are located in a cavity formed by the shell and the end cover, the end cover is provided with a low-pressure oil suction oil duct and a rear wall far away from the shell, and the low-pressure oil suction oil duct penetrates through the rear wall.
As a preferable technical solution of the plunger-type hydraulic pump, a seal ring is disposed between the end cap and the housing, the end cap has a front wall facing the housing, a seal groove is disposed on the front wall, a cross section of the seal groove is trapezoidal, and a small end of the cross section of the seal groove faces the housing.
As a preferred technical solution of the plunger type hydraulic pump, the plunger type hydraulic pump further comprises an adjusting structure, the adjusting structure comprises an adjusting rod and an adjusting piston, one end of the adjusting rod is connected with the swash plate, the other end of the adjusting rod is connected with the adjusting piston, the end cover is further provided with a piston cavity, and the adjusting piston is arranged in the piston cavity;
the end cover is further provided with an adjusting screw, the adjusting screw is in threaded connection with the end cover, and one end of the adjusting screw extends into the piston cavity and can adjust the displacement of the adjusting piston.
In a preferred embodiment of the plunger-type hydraulic pump, a ball is disposed at each end of the adjusting rod, a ball socket is disposed on the swash plate and the adjusting piston, and the ball is inserted into the ball socket.
In a preferred embodiment of the plunger-type hydraulic pump, a copper sleeve is disposed in the piston cavity, and the adjustment piston is slidably disposed in a cavity formed by the copper sleeve.
As a preferable technical solution of the plunger type hydraulic pump, the plunger type hydraulic pump further includes pressure blocks, the pressure blocks are arranged at intervals along the circumferential direction of the swash plate and are all connected with the swash plate, and the return disc is located between the pressure blocks and the swash plate.
As a preferred technical solution of the plunger type hydraulic pump, the plunger type hydraulic pump further comprises an oil guide pipe, the swash plate is provided with a first guide oil passage, the pressing block is provided with a second guide oil passage, and the oil guide pipe, the first guide oil passage and the second guide oil passage are communicated.
As a preferable embodiment of the plunger type hydraulic pump, the end cap is further provided with a lightening hole.
As a preferable technical solution of the plunger type hydraulic pump, the end cover has a top wall, and the end cover is provided with a high-pressure oil outlet passage which penetrates through the top wall.
As a preferable technical solution of the plunger type hydraulic pump, a lifting lug is arranged on the housing, and the lifting lug is positioned on the top of the housing.
The utility model discloses beneficial effect:
compared with the prior art, when the plunger type hydraulic pump is arranged in a star shape, the low-pressure oil inlet pipe is arranged on the rear wall of the end cover, so that the plunger type hydraulic pump integrally absorbs oil in an axial mode, the radial volume of the plunger type hydraulic pump cannot be occupied, and the requirement that the arrangement space of the plunger type hydraulic pump is compact is met.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is an elevation view of a plunger-type hydraulic pump provided by an embodiment of the present invention;
FIG. 2 isbase:Sub>A cross-sectional view taken at A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken at C-C of FIG. 1;
FIG. 4 is an enlarged view of a portion of FIG. 2 at A;
fig. 5 is a schematic position diagram of a lower blade starting point provided on an end cover according to an embodiment of the present invention;
FIG. 6 is a rear view of a plunger-type hydraulic pump provided by an embodiment of the present invention;
FIG. 7 is a cross-sectional view taken at B-B of FIG. 6;
fig. 8 is a schematic diagram of a plunger-type hydraulic pump according to an embodiment of the present invention.
In the figure:
1. a cylinder body; 2. a plunger; 3. an oil guide pipe; 4. a swash plate; 41. a first flow guide oil passage; 5. a return disk; 6. a drive shaft; 7. a housing; 71. lifting lugs; 8. an end cap; 81. a rear wall; 82. a low-pressure oil suction duct; 83. a high-pressure oil outlet duct; 84. a sealing groove; 85. a first piston chamber; 86. a second piston chamber; 87. lightening holes; 89. a top wall; 810. a starting point of a lower cutter; 91. adjusting a rod; 92. an adjusting piston; 93. a first adjusting screw; 94. a second adjusting screw; 10. briquetting; 101. a second flow guide oil passage; 11. bearing bushes; 12. a valve plate; 121. an oil absorption distribution groove; 122. an oil outlet distribution groove; 100. a proportional-adjustable pressure reducing valve; 200. a shuttle valve; 300. a spool valve; 400. and (4) bypassing the damping.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected", "connected" and "fixed" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
In the prior art, when a plunger type hydraulic pump is used in large-scale equipment, a plurality of plunger type hydraulic pumps can be arranged according to needs, but if an oil suction port is arranged on the periphery of an oil suction pump in the arrangement process of the hydraulic pumps, the requirement on the overall arrangement space of the plurality of hydraulic pumps is increased, and particularly when the plurality of hydraulic pumps are arranged in a star shape, the system is large in size and large in occupied space.
For this reason, in the present embodiment, a plunger type hydraulic pump is provided, which can reduce the occupied space when the hydraulic pump is arranged in a star shape, and reduce the overall arrangement space requirement.
As shown in fig. 1 and 2, the plunger type hydraulic pump includes a cylinder block 1, a plunger 2, a slipper, a swash plate 4, a return disc 5, a drive shaft 6, a housing 7, and an end cap 8, wherein the plunger 2 is disposed in the cylinder block 1 and is capable of reciprocating in the cylinder block 1; the sliding shoes are hinged with the plunger 2; the swash plate 4 is arranged at one end of the cylinder body 1, and the slipper can be tightly pressed on the swash plate 4; the return disc 5 is arranged between the swash plate 4 and the plunger 2, and the return disc 5 can press the slipper to the swash plate 4; the driving shaft 6 penetrates through the cylinder body 1 and is in transmission connection with the cylinder body 1, the driving shaft 6 is rotatably penetrated through the swash plate 4 and the return plate 5, and the driving shaft 6 can drive the cylinder body 1 to rotate; the shell 7 is connected with the end cover 8, the driving shaft 6 is connected with the shell 7 in a rotating mode, the cylinder body 1, the plunger 2, the sliding shoe, the swash plate 4 and the return plate 5 are all located in a cavity formed by the shell 7 and the end cover 8, the end cover 8 is provided with a low-pressure oil suction oil duct 82 and a rear wall 81 far away from the shell 7, and the low-pressure oil suction oil duct 82 penetrates through the rear wall 81.
Compared with the prior art, when the plunger type hydraulic pump is arranged in a star shape, the low-pressure oil inlet pipe is arranged on the rear wall 81 of the end cover 8, so that the whole plunger type hydraulic pump absorbs oil in an axial mode, the radial volume of the plunger type hydraulic pump cannot be occupied, and the requirement that the arrangement space of the plunger type hydraulic pump is compact is met.
Specifically, it is set that the low-pressure oil suction passage 82 is located at the rear wall 81 and is a low-pressure oil suction port, and the central axis of the end cover 8 passes through the central point of the low-pressure oil suction port, that is, the central axis of the end cover 8 passes through the low-pressure oil suction port. Therefore, the arrangement of the low-pressure oil inlet pipe can be facilitated, the occupied space of the low-pressure oil inlet pipe is reduced, and the arrangement of a plurality of plunger type hydraulic pumps in a star shape is facilitated.
In the present embodiment, with continued reference to fig. 2, end cover 8 has a top wall 89, and end cover 8 is provided with high-pressure oil outlet passage 83, and high-pressure oil outlet passage 83 is provided through top wall 89. That is, it can be understood that the high-pressure oil outlet passage 83 is located on the top wall 89, and does not occupy the bottom space of the plunger type hydraulic pump. Specifically, the housing 7 is provided with a lifting lug 71, and the lifting lug 71 is located at the top of the housing 7, and it is understood that the outlet of the high-pressure oil outlet passage 83 is located on the same side of the housing 7 as the lifting lug 71. The arrangement of the lifting lug 71 is convenient for the integral hoisting, testing and installation of the plunger type hydraulic pump.
In the present embodiment, the plunger type hydraulic pump further includes a plurality of pressing blocks 10, the pressing blocks 10 are disposed at intervals along the circumferential direction of the swash plate 4 and are all connected to the swash plate 4, and the return disc 5 is located between the pressing blocks 10 and the swash plate 4. The return disc 5 presses the sliding shoes onto the swash plate 4, and the return disc 5 is limited by pressing blocks 10 arranged at intervals.
In the present embodiment, the plunger type hydraulic pump further includes an oil conduit 3, the swash plate 4 is provided with a first guide oil passage 41, the pressing block 10 is provided with a second guide oil passage 101, and the oil conduit 3, the first guide oil passage 41 and the second guide oil passage 101 are communicated. Specifically, the first guide oil passage 41 can introduce high-pressure oil between the swash plate 4 and the bearing bush 11 of the housing 7, so that no clamping stagnation is generated in the swinging process of the swash plate 4, and the service life of the bearing bush 11 is prolonged.
In the present embodiment, in order to reduce the overall weight of the plunger type hydraulic pump, the head cover 8 is further provided with a lightening hole 87. The number of the lightening holes 87 is set according to actual needs, but it should be noted that the lightening holes 87 should not influence the arrangement of other flow passages.
In the present embodiment, as shown in fig. 3, the plunger type hydraulic pump further includes a port plate 12, the port plate 12 is disposed between the housing 7 and the head cover 8, the port plate 12 is provided with an oil suction port 121 and an oil discharge port 122, the oil suction port 121 communicates with the low-pressure oil suction passage 82, and the oil discharge port 122 communicates with the high-pressure oil discharge passage 83. The port plate 12 can separate the low pressure oil suction passage 82 and the high pressure oil discharge passage 83, and output torque when high pressure oil of a plunger in the plunger hydraulic pump acts, and discharge high pressure oil in a plunger chamber where the output torque is stopped when low pressure oil (return oil) acts.
Since the hydraulic oil is introduced into the plunger type hydraulic pump, in order to prevent the leakage at the joint between the head cover 8 and the casing 7, in the present embodiment, a seal ring is provided between the head cover 8 and the casing 7, the head cover 8 has a front wall facing the casing 7, as shown in fig. 3 and 4, a seal groove 84 is provided on the front wall, the cross section of the seal groove 84 is trapezoidal, and the small end of the cross section of the seal groove 84 faces the casing 7. For example, the sealing ring is a 0-type sealing ring, so that when the sealing ring is located in the sealing groove 84, the small end of the sealing groove 84 can limit the sealing ring from being removed, and therefore the end cover 8 and the shell 7 can be assembled more easily in the assembling process. In order to facilitate the machining of the seal groove 84, the end cap 8 is provided with a lower cutting start point 810 (see fig. 5).
In this embodiment, the plunger hydraulic pump further includes an adjusting structure, as shown in fig. 6 and 7, the adjusting structure is used for adjusting the angle of the swash plate 4, the adjusting structure includes an adjusting rod 91 and an adjusting piston 92, one end of the adjusting rod 91 is connected to the swash plate 4, the other end of the adjusting rod 91 is connected to the adjusting piston 92, a piston cavity is further disposed on the end cover 8, and the adjusting piston 92 is disposed in the piston cavity; further, an adjusting screw is further arranged on the end cover 8, the adjusting screw is connected to the end cover 8 in a threaded manner, and one end of the adjusting screw extends into the piston cavity and can adjust the displacement of the adjusting piston 92.
Further, the piston cavity comprises a first piston cavity 85 and a second piston cavity 86, wherein the diameter of the first piston cavity 85 is larger than that of the second piston cavity 86, so that different oil pressures of hydraulic oil in the two piston cavities can be realized, and the purpose of adjusting the angle of the swash plate 4 is realized.
The adjusting screw and the end cover 8 are of a self-sealing structure, the adjusting screw comprises a first adjusting screw 93 and a second adjusting screw 94, wherein the first adjusting screw 93 can adjust the initial position of the adjusting piston 92 in the first piston cavity 85 to achieve the effect of adjusting the large displacement of the hydraulic pump, and the second adjusting screw 94 can adjust the initial position of the adjusting piston 92 in the second piston cavity 86 to achieve the effect of adjusting the small displacement of the hydraulic pump.
Because end cover 8 is the foundry goods structure, because the friction between steel and the iron is vice relatively poor for the friction between steel and the copper vice, consequently, be provided with the copper sheathing in the piston chamber, specifically, the copper sheathing is connected with piston chamber interference fit, and adjusting piston 92 can set up in the cavity that the copper sheathing formed with sliding, and adjusting rod 91 is connected with adjusting piston 92 rotation. In addition, the copper sleeve has guiding and lubricating functions relative to the adjusting piston 92, the copper has good heat conducting performance, and heat generated by relative movement friction between the adjusting rod 91 and the copper sleeve can be timely guided out of the end cover 8 through the copper sleeve and then emitted out of the interior of the hydraulic pump set. In other embodiments, a steel sleeve is disposed in the piston cavity, which also improves the friction between the adjustment piston 92 and the piston cavity, and prolongs the service life of the hydraulic pump.
In the present embodiment, the two ends of the adjusting rod 91 are provided with ball heads, and the swash plate 4 and the adjusting piston 92 are provided with ball sockets into which the ball heads project. The adjusting rod 91 is connected with the swash plate 4 through the matching mode of a ball head and a ball socket, so that the swash plate 4 can be smoothly changed in angle without clamping stagnation.
As shown in fig. 8, after the current of the variable-ratio pressure reducing valve 100 is changed, the oil enters a pilot cavity of the spool 300 of the swash plate 4 through a throttle valve (in this embodiment, a bypass damper 400) to provide pilot oil for the spool 300, and the pilot oil pushes a spool of the spool 300 to operate, so that the purpose of adjusting the swash plate 4 is achieved through different oil inlets of the spool 300. The shuttle valve 200 selects the hydraulic oil supplied from the oil supply port Y and the hydraulic oil supplied from the variable displacement pump, which have a higher pressure, as the control oil source of the shuttle valve 200. So that the rotary pilot oil or hydraulic oil is output, and the oil outlet of the shuttle valve 200 is communicated with the rodless chamber of the variable rod through the spool valve 300.
If the output displacement of the variable displacement pump needs to be increased, the spool of the control slide valve 300 moves rightwards, oil in the rodless cavity flows back to the opening of the oil tank through the slide valve 300 and is gradually increased, the oil port of the slide valve 300 entering the rodless cavity is decreased, therefore, the oil pressure in the rodless cavity is gradually reduced, the force of the oil in the rod cavity acting on the variable cylinder piston is larger than the force of the oil in the rodless cavity acting on the piston, the variable cylinder is mechanically connected to the pilot cavity of the slide valve 300, the piston moves rightwards at the moment, the swing angle of the swash plate 4 is driven to be increased, meanwhile, the spool of the slide valve 300 is driven to move rightwards, and the effect of adjusting the output displacement of the variable displacement pump is achieved.
In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A plunger-type hydraulic pump, comprising:
a cylinder body (1);
a plunger (2) which is provided in the cylinder (1) and can reciprocate in the cylinder (1);
a sliding shoe hinged with the plunger (2);
a swash plate (4) which is provided at one end of the cylinder block (1) and to which the shoes can be pressed;
a return disc (5) provided between the swash plate (4) and the plunger (2), the return disc (5) being capable of pressing the shoe against the swash plate (4);
the driving shaft (6) is arranged in the cylinder body (1) in a penetrating mode and is in transmission connection with the cylinder body (1), the driving shaft (6) is arranged in the swash plate (4) and the return plate (5) in a penetrating mode in a rotating mode, and the driving shaft (6) can drive the cylinder body (1) to rotate;
casing (7) and end cover (8), casing (7) with end cover (8) are connected, drive shaft (6) with casing (7) rotate to be connected, cylinder block (1) plunger (2) slipper, swash plate (4) return stroke dish (5) all are located casing (7) with in the cavity that end cover (8) formed, end cover (8) have low pressure oil absorption oil duct (82) and keep away from back wall (81) of casing (7), low pressure oil absorption oil duct (82) run through back wall (81) set up.
2. Plunger type hydraulic pump according to claim 1, characterized in that a sealing ring is arranged between the end cover (8) and the casing (7), the end cover (8) has a front wall facing the casing (7), a sealing groove (84) is arranged on the front wall, the cross section of the sealing groove (84) is trapezoidal, and the small end of the cross section of the sealing groove (84) faces the casing (7).
3. Plunger type hydraulic pump according to claim 1, characterized by further comprising an adjusting structure, wherein the adjusting structure comprises an adjusting rod (91) and an adjusting piston (92), one end of the adjusting rod (91) is connected with the swash plate (4), the other end of the adjusting rod (91) is connected with the adjusting piston (92), a piston cavity is further arranged on the end cover (8), and the adjusting piston (92) is arranged in the piston cavity;
the end cover (8) is further provided with an adjusting screw, the adjusting screw is in threaded connection with the end cover (8), and one end of the adjusting screw extends into the piston cavity and can adjust the displacement of the adjusting piston (92).
4. A plunger-type hydraulic pump as in claim 3, characterized in that the adjusting rod (91) is provided with a ball head at both ends, and the swash plate (4) and the adjusting piston (92) are provided with a ball socket into which the ball heads protrude.
5. Plunger-type hydraulic pump according to claim 3, characterized in that a copper sleeve is arranged in the piston chamber, and the regulating piston (92) is slidably arranged in a chamber formed by the copper sleeve.
6. Plunger type hydraulic pump according to claim 1, characterized by further comprising pressure blocks (10), the pressure blocks (10) being arranged at intervals in the circumferential direction of the swash plate (4) and being connected to the swash plate (4), the return disc (5) being located between the pressure blocks (10) and the swash plate (4).
7. Plunger type hydraulic pump according to claim 6, characterized in that it further comprises an oil conduit (3), the swash plate (4) is provided with a first oil guide channel (41), the pressure block (10) is provided with a second oil guide channel (101), and the oil conduit (3), the first oil guide channel (41) and the second oil guide channel (101) are in communication.
8. Plunger-type hydraulic pump as in claim 1, characterized in that the end cover (8) is further provided with lightening holes (87).
9. A plunger-type hydraulic pump as set forth in claim 8, characterized in that the end cover (8) has a top wall (89), and the end cover (8) is provided with a high-pressure oil outlet passage (83), the high-pressure oil outlet passage (83) penetrating the top wall (89).
10. Plunger type hydraulic pump according to claim 8, characterized in that a lifting lug (71) is arranged on the casing (7), which lifting lug (71) is located on top of the casing (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222737582.4U CN218669688U (en) | 2022-10-18 | 2022-10-18 | Plunger type hydraulic pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222737582.4U CN218669688U (en) | 2022-10-18 | 2022-10-18 | Plunger type hydraulic pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218669688U true CN218669688U (en) | 2023-03-21 |
Family
ID=85563602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222737582.4U Active CN218669688U (en) | 2022-10-18 | 2022-10-18 | Plunger type hydraulic pump |
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| Country | Link |
|---|---|
| CN (1) | CN218669688U (en) |
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2022
- 2022-10-18 CN CN202222737582.4U patent/CN218669688U/en active Active
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