Return plate pressing plate and axial plunger pump

Abstract

The utility model discloses a return plate pressing plate, which relates to the technical field of plunger pumps and comprises a first pressing plate and a second pressing plate, the first pressing plate is used for being arranged at a first position on a swash plate of an axial plunger pump, and the first pressing plate is provided with a first hinge hole and a second hinge hole which are used for being hinged with a variable piston unit; the second pressing plate is used for being arranged at the second position of the swash plate, the containing space used for containing the return plate is formed between the first pressing plate and the surface of the swash plate and between the second pressing plate and the surface of the swash plate, the return plate can rotate in the containing space, the structure of the return plate pressing plate is simplified, accumulated tolerance is reduced, and machining cost is reduced. The utility model further provides an axial plunger pump. The axial plunger pump comprises a main shaft, a shell, a swash plate, a return plate, a hydraulic assembly and a return plate pressing plate.

Description

TECHNICAL FIELD

[0001] The utility model relates to plunger pump technical field, in particular to a kind of return disc pressure plate and axial plunger pump. BACKGROUND

[0002] In axial high-pressure plunger pump, especially in plunger reciprocating motion, return disc pressure plate is needed to be used to limit return disc to the surface of swash plate to rotate circumferentially, return disc rotates circumferentially on the surface of swash plate to drive plunger forced return, in existing pressure plate, the parts of the structure that already exist are more complicated, such as Chinese patent application (CN112555116A), two hinged holes matched with variable piston unit are respectively arranged on two pressure plates, although it can meet the function of limiting the axial movement of return disc, but when calculating the size chain of existing pressure plate, accumulated tolerance is larger, the machining tolerance of two pressure plates, the installation tolerance of two pressure plates on the surface of swash plate and the machining tolerance of two hinged holes on two pressure plates are all calculated, in actual use, there is a large difference between the actual displacement of axial plunger pump and calculated displacement. And hinged hole is arranged on two pressure plates, and the processing procedure is longer, the hinged hole on one pressure plate is machined, and another pressure plate is replaced to machine another hinged hole, and the processing cost is higher, so a new type of return disc pressure plate is developed. SUMMARY

[0003] The utility model aims at providing a kind of return disc pressure plate, to solve the problems existing in the prior art described above, to simplify return disc pressure plate structure, reduce accumulated tolerance, reduce processing cost.

[0004] To achieve the above object, the utility model provides the following scheme:

[0005] The utility model provides a kind of return disc pressure plate, comprising: first pressure plate and second pressure plate, the first pressure plate is used to set in the first position on the swash plate of axial plunger pump, first hinged hole and second hinged hole for being hinged with variable piston unit are arranged on the first pressure plate;The second pressure plate is used to set in the second position on the swash plate, and the first pressure plate and the second pressure plate form containing space for accommodating return disc between the surface of the swash plate, and the return disc can rotate in the containing space.

[0006] In some embodiments, the first hinged hole and the second hinged hole are respectively arranged at two ends of the first pressure plate.

[0007] In some embodiments, the first pressing plate is provided with a first limiting protrusion, the second pressing plate is provided with a second limiting protrusion, the first limiting protrusion and the second limiting protrusion form the containing space with the surface of the swash plate, and the first limiting protrusion and the second limiting protrusion jointly limit the axial movement of the return plate.

[0008] In some embodiments, the first limiting protrusion and the second limiting protrusion are detachably provided with a plurality of wear-resistant blocks towards the surface of the return plate, and each wear-resistant block is in the same plane as the surface of the return plate.

[0009] In some embodiments, the first pressing plate and the second pressing plate are fixedly connected with the swash plate by bolts.

[0010] The utility model also provides a kind of axial plunger pump, comprising: main shaft, shell, swash plate, return plate, hydraulic assembly and the return plate pressing plate as described above;The swash plate, the return plate, the hydraulic assembly and the return plate pressing plate are all arranged in the shell interior;The main shaft is used to be drivingly connected with external power device, and one end of the main shaft is inserted into the shell interior and is drivingly connected with the hydraulic assembly;The hydraulic assembly can cooperate with the swash plate and the return plate to convert the power transmitted by the main shaft into hydraulic pressure.

[0011] In some embodiments, the axial plunger pump further includes a variable piston unit for pushing the swash plate to change the inclination angle of the swash plate;The variable piston unit includes a large piston assembly and a small piston assembly;One end of the large piston assembly is hingedly connected to the first pressing plate at the first hinge hole, and the other end of the large piston assembly is arranged on the shell, and the large piston assembly is used to adjust the inclination angle of the swash plate;One end of the small piston assembly is hingedly connected to the first pressing plate at the second hinge hole, and the other end of the small piston assembly is arranged on the shell, and the small piston assembly is used to reset the inclination angle of the swash plate.

[0012] In some embodiments, the axial plunger pump further includes: the limiting screw is arranged on the shell of the axial plunger pump, the surface of the swash plate is provided with a limiting surface, one end of the limiting screw is inserted into the shell, and when the limiting surface abuts, the inclination angle of the swash plate can be limited.

[0013] In some embodiments, the limiting screw is provided with two limiting screws respectively being a maximum limiting screw and a minimum limiting screw, a maximum limiting surface corresponding to the maximum limiting screw is arranged on the surface of the swash plate, and a minimum limiting surface corresponding to the minimum limiting screw is arranged on the surface of the swash plate; when one end of the maximum limiting screw abuts against the maximum limiting surface, the swash plate reaches a maximum inclination angle; and when one end of the minimum limiting screw abuts against the minimum limiting surface, the swash plate reaches a minimum inclination angle.

[0014] In some embodiments, the large piston assembly, the maximum limiting screw and the maximum limiting surface are arranged on one side of the main shaft, and the small piston assembly, the minimum limiting screw and the minimum limiting surface are arranged on the other side of the main shaft.

[0015] The utility model discloses relative to prior art has obtained following technical effect:

[0016] The utility model discloses a return disc pressure plate and axial piston pump, set up both first articulation hole and second articulation hole on first pressure plate, simplified the structure of return disc pressure plate, and the utility model discloses a return disc pressure plate two articulation hole's cumulative tolerance is only two articulation hole's processing tolerance, relative to prior art return disc pressure plate, that is to say, with the technical scheme of two articulation holes of variable piston unit cooperation are arranged on two pressure plates respectively, eliminate two pressure plates's processing tolerance, two pressure plates's installation tolerance on the surface of swash plate and two articulation holes's cumulative tolerance of processing tolerance on two pressure plates respectively, that is to say, reduce two articulation holes's cumulative tolerance, in actual use, the difference between actual displacement and calculated displacement of axial piston pump is smaller, avoid the influence of experimental result when the cumulative tolerance between two articulation holes is bigger when calculating dimension chain. And first articulation hole and second articulation hole design on the same return disc pressure plate, relative to two articulation holes setting up on two return disc pressure plates respectively, two return disc pressure plates all need to process articulation hole, only process first articulation hole and second articulation hole on first pressure plate, and the cost of second pressure plate not needing to process articulation hole is lower. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiments, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.

[0018] Figure 1 It is the three-dimensional structure schematic diagram of return disc pressure plate in some embodiments;

[0019] Figure 2A top view of a back disk pressing plate in some embodiments;

[0020] Figure 3 For Figure 2 A bottom view of a back disk pressing plate in some embodiments;

[0021] Figure 4 A schematic view of the cooperation of the back disk pressing plate with the variable piston unit and the limit screw in Embodiment Two.

[0022] In the figure: 1- first pressing plate; 11- first hinged hole; 12- second hinged hole; 13- first limit protrusion; 2- second pressing plate; 23- second limit protrusion; 3- wear-resistant block; 41- large piston assembly; 42- small piston assembly; 51- maximum limit screw; 52- minimum limit screw; 6- swash plate; 61- maximum limit surface; 62- minimum limit surface. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] The purpose of the present application is to provide a back disk pressing plate and an axial plunger pump to solve the problems existing in the prior art, to simplify the structure of the back disk pressing plate, to reduce the cumulative tolerance, and to reduce the processing cost.

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more apparent, obvious and easy to understand, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Figures 1-4 and the specific embodiments.

[0026] Embodiment One

[0027] The present embodiment provides a back disk pressing plate, which refers to Figures 1-3The utility model provides a return plate pressure plate, including: first pressure plate 1 and second pressure plate 2, first pressure plate 1 is used to set up in the first position on swash plate 6 of axial piston pump, and first pressure plate 1 is provided with first articulation hole 11 and second articulation hole 12 for articulating with variable piston unit, second pressure plate 2 is used to set up in the second position on swash plate 6, and first pressure plate 1 and second pressure plate 2 form the containing space for accommodating return plate between the surface of swash plate 6, and return plate can rotate in the containing space, the utility model provides a return plate pressure plate, first articulation hole 11 and second articulation hole 12 are all arranged on first pressure plate 1, simplify the structure of return plate pressure plate, and the utility model provides the cumulative tolerance of two articulation holes of return plate pressure plate is only the machining tolerance of two articulation holes, relative to the prior art return plate pressure plate, that is, the technical scheme of two articulation holes that cooperate with variable piston unit are arranged on two pressure plates respectively, eliminates the machining tolerance of two pressure plates, the mounting tolerance of two pressure plates on the surface of swash plate 6 and the cumulative tolerance of the machining tolerance of two articulation holes on two pressure plates respectively, that is, reduces the cumulative tolerance between two articulation holes, in actual use, the difference between the actual displacement of axial piston pump and the calculated displacement is smaller, avoids the cumulative tolerance between two articulation holes when calculating the size chain to make the experimental result be influenced. And first articulation hole 11 and second articulation hole 12 are designed on the same first pressure plate 1, relative to two articulation holes being arranged on two return plate pressure plates respectively, first articulation hole 11 and second articulation hole 12 are only machined on first pressure plate 1, and second pressure plate 2 does not need to machine articulation hole, and the cost is lower.

[0028] In some embodiments provided by the utility model, the first articulation hole 11 and the second articulation hole 12 are arranged at two ends of the first pressure plate 1. Arranging the first articulation hole 11 and the second articulation hole 12 at two ends of the first pressure plate 1 makes the first pressure plate 1 easy to balance stress, and increases the service life of the return plate pressure plate.

[0029] In some embodiments provided by the utility model, the first pressure plate 1 is provided with a first limiting protrusion 13, the second pressure plate 2 is provided with a second limiting protrusion 23, the first limiting protrusion 13 and the second limiting protrusion 23 form a containing space with the surface of the swash plate 6, and the first limiting protrusion 13 and the second limiting protrusion 23 jointly limit the axial movement of the return plate. The first pressure plate 1 and the second pressure plate 2 limit the return plate in the containing space on the surface of the swash plate 6 through the first limiting protrusion 13 and the second limiting protrusion 23, so that the return plate can only rotate circumferentially, which is more reliable compared with the structure of limiting the return plate on the surface of the swash plate 6 through a ball hinge only, and the axial movement of the return plate is more difficult, avoiding the axial movement of the return plate to make the actual displacement of the axial piston pump smaller than the calculated displacement.

[0030] In some embodiments of the utility model, first limit convex edge 13 and second limit convex edge 23 are detachably provided with a plurality of wear-resistant blocks 3 on the surface of the return disc, and each wear-resistant block 3 is on the same plane of the surface of the return disc. When the axial piston pump is maintained, only the wear-resistant block 3 needs to be replaced instead of the whole return disc pressure plate, so the maintenance cost is lower than that of the whole return disc pressure plate replacement scheme, and the maintenance cost of the axial piston pump is reduced.

[0031] In some embodiments of the utility model, the first pressure plate 1 and the second pressure plate 2 are fixedly connected with the swash plate 6 through bolts. The first pressure plate 1 and the second pressure plate 2 are fixed on the surface of the swash plate 6 through bolt connection, which is simple in structure and easy to process. In other embodiments, the first pressure plate 1 and the second pressure plate 2 can also be fixedly connected with the swash plate 6 through other detachable connection forms.

[0032] Embodiment two

[0033] The embodiment provides an axial piston pump, which comprises a main shaft, a shell, a swash plate 6, a return disc, a hydraulic assembly and the return disc pressure plate in embodiment one; the swash plate 6, the return disc, the hydraulic assembly and the return disc pressure plate are arranged in the shell; the main shaft is used for being in transmission connection with an external power device, one end of the main shaft extends into the shell and is in transmission connection with the hydraulic assembly; the hydraulic assembly can cooperate with the swash plate 6 and the return disc to convert the power transmitted by the main shaft into hydraulic pressure. Compared with the axial piston pump in the prior art, the axial piston pump provided by the embodiment uses the return disc pressure plate in embodiment one, has low cost, small cumulative tolerance, small difference between actual displacement and calculated displacement, and can be applied to high-reliability application scenarios, such as industrial production, aerospace and the like.

[0034] In some embodiments of the utility model, referring to Figure 4 , the axial piston pump further comprises a variable piston unit for pushing the swash plate 6 to change the inclination angle of the swash plate 6; the variable piston unit comprises a large piston assembly 41 and a small piston assembly 42; one end of the large piston assembly 41 is hinged to the first hinge hole 11 of the first pressure plate 1, and the other end of the large piston assembly 41 is arranged on the shell; the large piston assembly 41 is used for adjusting the inclination angle of the swash plate 6; one end of the small piston assembly 42 is hinged to the second hinge hole 12 of the first pressure plate 1, and the other end of the small piston assembly 42 is arranged on the shell; the small piston assembly 42 is used for resetting the inclination angle of the swash plate 6. By arranging the small piston assembly 42 and the large piston assembly 41 and hinging the large piston assembly 41 and the small piston assembly 42 to the first pressure plate 1, the displacement of the axial piston pump is facilitated to be adjusted. The inclination angle of the swash plate 6 is adjusted by the large piston assembly 41 to adjust the displacement of the axial piston pump, the inclination angle of the swash plate 6 is reset by the small piston assembly 42 to restore the initial set displacement of the axial piston pump, the displacement of the axial piston pump is adjustable, and the structure of the axial piston pump is compact.

[0035] In some embodiments provided by the utility model, the axial plunger pump further comprises a limiting screw, the limiting screw is arranged on the shell of the axial plunger pump, a limiting surface is arranged on the surface of the swash plate 6, one end of the limiting screw extends into the shell of the axial plunger pump, and the swash plate 6 can be limited when the one end of the limiting screw abuts against the limiting surface. The limiting surface is arranged on the swash plate 6, the limiting area provided by the swash plate 6 is large, and the swash plate 6 is usually made of wear-resistant material, so the swash plate 6 is more wear-resistant than the return plate pressing plate and is not easy to be damaged.

[0036] In some embodiments provided by the utility model, the limiting screw is provided with two limiting screws, i.e., a maximum limiting screw 51 and a minimum limiting screw 52, a maximum limiting surface 61 is arranged on the surface of the swash plate 6 corresponding to the position of the maximum limiting screw 51, and a minimum limiting surface 62 is arranged on the surface of the swash plate 6 corresponding to the position of the minimum limiting screw 52; when one end of the maximum limiting screw 51 abuts against the maximum limiting surface 61, the swash plate 6 reaches the maximum inclination angle; and when one end of the minimum limiting screw 52 abuts against the minimum limiting surface 62, the swash plate 6 reaches the minimum inclination angle. The maximum limiting screw 51, the maximum limiting surface 61, the minimum limiting screw 52 and the minimum limiting surface 62 are arranged respectively, so that the maximum displacement and the minimum displacement of the axial plunger pump can be limited, the axial plunger pump can be operated within the normal displacement working range, and the service life of the axial plunger pump is prolonged.

[0037] In some embodiments provided by the utility model, the large piston assembly 41, the maximum limiting screw 51 and the maximum limiting surface 61 are arranged on one side of the main shaft, and the small piston assembly 42, the minimum limiting screw 52 and the minimum limiting surface 62 are arranged on the other side of the main shaft. By arranging the large piston assembly 41, the maximum limiting screw 51 and the maximum limiting surface 61 on one side of the main shaft and arranging the small piston assembly 42, the minimum limiting screw 52 and the minimum limiting surface 62 on the other side of the main shaft, the swash plate 6 and the return plate pressing plate can be easily balanced, the service life of the return plate pressing plate and the swash plate 6 can be prolonged, and the service life of the axial plunger pump is further prolonged.

[0038] The principle and implementation mode of the utility model are described by using specific examples in the utility model, and the above embodiment is only used for helping to understand the method and core idea of the utility model; meanwhile, according to the idea of the utility model, the specific implementation mode and application range can be changed by the general technical personnel in the field. In conclusion, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A backhaul disc press plate, characterized by: Comprising: a first pressure plate for being arranged at a first position on a swash plate of an axial piston pump, the first pressure plate being provided with a first hinge hole and a second hinge hole for being hinged with a variable piston unit; and a second pressure plate for being arranged at a second position on the swash plate, and the first pressure plate and the second pressure plate forming an accommodation space between the surface of the swash plate and the first pressure plate and the second pressure plate for accommodating a return plate, the return plate being able to rotate in the accommodation space.

2. The return plate pressure plate according to claim 1, wherein: the first hinge hole and the second hinge hole are respectively arranged at two ends of the first pressure plate.

3. The return plate pressure plate according to claim 1, wherein: the first pressure plate is provided with a first limiting protrusion, the second pressure plate is provided with a second limiting protrusion, the first limiting protrusion and the second limiting protrusion form the accommodation space between the surface of the swash plate and the first limiting protrusion and the second limiting protrusion, and the first limiting protrusion and the second limiting protrusion jointly limit the axial movement of the return plate.

4. The return plate pressure plate according to claim 3, wherein: the first limiting protrusion and the second limiting protrusion are respectively detachably provided with a plurality of wear-resistant blocks towards the surface of the return plate, and each of the wear-resistant blocks is arranged on the same plane towards the surface of the return plate.

5. The return plate pressure plate according to claim 1, wherein: the first pressure plate and the second pressure plate are fixedly connected with the swash plate by bolts.

6. An axial piston pump characterized by: Comprising: a main shaft, a housing, a swash plate, a return plate, a hydraulic assembly, and the return plate pressure plate according to any one of claims 1-5; the swash plate, the return plate, the hydraulic assembly, and the return plate pressure plate are all arranged inside the housing; the main shaft is used for being drivingly connected with an external power device, one end of the main shaft extends into the housing and is drivingly connected with the hydraulic assembly; the hydraulic assembly can cooperate with the swash plate and the return plate to convert the power transmitted by the main shaft into hydraulic pressure.

7. The axial piston pump of claim 6, characterized in that: Further comprising the variable piston unit for pushing the swash plate to change the inclination angle of the swash plate; the variable piston unit comprises a large piston assembly and a small piston assembly; one end of the large piston assembly is hinged with the first pressure plate at the first hinge hole, the other end of the large piston assembly is arranged on the housing, and the large piston assembly is used for adjusting the inclination angle of the swash plate; one end of the small piston assembly is hinged with the first pressure plate at the second hinge hole, the other end of the small piston assembly is arranged on the housing, and the small piston assembly is used for resetting the inclination angle of the swash plate.

8. The axial piston pump of claim 7, characterized in that: Further comprising: a limiting screw arranged on the housing of the axial piston pump, a limiting surface is arranged on the surface of the swash plate, one end of the limiting screw extends into the housing, and when the limiting surface is abutted, the inclination angle of the swash plate can be limited.

9. The axial piston pump according to claim 8, wherein: The limiting screw is provided with two maximum limiting screws and minimum limiting screws, the surface of the swash plate is provided with a maximum limiting surface corresponding to the position of the maximum limiting screw, and the surface of the swash plate is provided with a minimum limiting surface corresponding to the position of the minimum limiting screw; When one end of the maximum limiting screw abuts against the maximum limiting surface, the swash plate reaches the maximum inclination angle; when one end of the minimum limiting screw abuts against the minimum limiting surface, the swash plate reaches the minimum inclination angle.

10. The axial piston pump of claim 9, wherein: The large piston assembly, the maximum limiting screw and the maximum limiting surface are arranged on one side of the main shaft, and the small piston assembly, the minimum limiting screw and the minimum limiting surface are arranged on the other side of the main shaft.

Images