Sliding assembly and plunger pump

Abstract

The present invention relates to the technical field of plunger pumps, and in particular, to a sliding assembly and a plunger pump. The sliding assembly comprises: a pad unit, a partition unit, and a chuck unit. The pad unit comprises a plate body and a first rivet hole. The partition unit comprises a partition ring and a second rivet hole. The chuck unit comprises a disc body, an extension portion, and a third rivet hole. One end of the extension portion is fixedly connected to the inner circumferential wall of the disc body, and the other end extends toward the direction close to the central axis of the disc body. The first rivet hole, the second rivet hole, and the third rivet hole are correspondingly arranged. The rivet passes through the first rivet hole, the second rivet hole, and the third rivet hole in sequence to rivet the plate body, the partition ring, and the disc body. D1>D2, D1 is the distance between the side wall of the extension portion close to the plate body and the side wall of the plate body close to the extension portion when the side walls of the plate body, the partition ring, and the disc body are abutted in sequence before riveting, and D2 is the thickness of the partition ring. In this way, the problem of easy wear between the sliding assembly and the sliding shoe is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of plunger pumps, and in particular to a sliding assembly and a plunger pump. Background Art

[0002] As an important hydraulic component, the plunger pump plays a key role in many fields. The plunger pump changes the volume of the sealed working chamber through the reciprocating motion of the piston unit in the cylinder body, thereby achieving oil suction and oil compression. The plunger pump can generate high-pressure liquid to drive the actuators in the hydraulic system, such as hydraulic cylinders, hydraulic motors, etc., and then drive various mechanical equipment to work. The plunger pump drives the piston rod to move back and forth through the sliding shoe relative to the swash plate to achieve the actions of oil suction, compression, and oil discharge. The sliding of the sliding shoe relative to the swash plate is completed by the sliding assembly. The sliding assembly surrounds the sliding shoe and maintains the relative position between multiple sliding shoes. The head of the piston unit is equipped with a sliding shoe, and the bottom of the sliding shoe always moves against the surface of the swash plate. The piston holes are evenly distributed on the cylinder body, and the cylinder body is driven to rotate by the transmission shaft, thereby driving the piston unit to reciprocate. The sliding shoe rotates in the sliding assembly, which can reduce the rotation of the piston rod in the piston hole, thereby reducing the wear and friction loss of the piston unit and the swash plate, extending the life of the piston unit, and improving the working efficiency and service life of the plunger pump.

[0003] During the operation of the plunger pump, it is easy to cause the gap between the slipper and the sliding assembly to be difficult to control, which makes it easy for the sliding assembly and the slipper to wear. If the gap is too small, it is easy for the slipper to rotate unsmoothly relative to the sliding assembly, which may cause the risk of jamming and affect the normal operation of the plunger pump. If the gap is too large, the plunger pump will vibrate too much, which will increase the wear and reduce the life of the plunger pump. Summary of the invention

[0004] In order to solve the problem of easy wear between a sliding assembly and a sliding shoe, the present invention provides a sliding assembly and a plunger pump.

[0005] In a first aspect, the present invention provides a sliding assembly, the sliding assembly comprising:

[0006] A backing plate unit, the backing plate unit comprising a plate body and first rivet holes; the first rivet holes are arranged at intervals along the circumference of the plate body;

[0007] A separation unit, the separation unit comprising a separation ring and second rivet holes; the separation ring is annular; the second rivet holes are arranged at intervals along the circumference of the separation ring;

[0008] A chuck unit, the chuck unit comprising a disc body, an extension portion, and a third rivet hole; the disc body is annular; the third rivet holes are arranged at intervals along the circumference of the disc body; one end of the extension portion is fixedly connected to the inner circumferential wall of the disc body, and the other end extends toward the direction close to the central axis of the disc body;

[0009] The side walls of the plate body, the separation ring, and the disk body are abutted in sequence; the first rivet hole, the second rivet hole, and the third rivet hole are arranged correspondingly; the end of the extension part away from the disk body is spaced apart from the separation ring;

[0010] A rivet, wherein the rivet passes through the first rivet hole, the second rivet hole, and the third rivet hole in sequence to rivet the plate body, the separation ring, and the disc body;

[0011] Among them, D1>D2, D1 is the distance between the side wall of the extension part close to the plate body and the side wall of the plate body close to the extension part when the side walls of the plate body, the separation ring and the disk body are abutted in sequence before riveting, and D2 is the thickness of the separation ring.

[0012] In some embodiments, the diameter of the third rivet hole gradually decreases from one end away from the second rivet hole toward the other end thereof.

[0013] In some embodiments, B>A; wherein A is the angle between the side of the third rivet hole close to the central axis of the disk body and the central axis of the third rivet hole, and B is the angle between the side of the third rivet hole away from the central axis of the disk body and the central axis of the third rivet hole.

[0014] In some embodiments, the diameter of the first rivet hole at one end away from the second rivet hole gradually decreases toward the other end thereof; wherein, D>C, C is the angle between the side of the first rivet hole close to the central axis of the disk body and the central axis of the first rivet hole, and D is the angle between the side of the first rivet hole away from the central axis of the disk body and the central axis of the first rivet hole.

[0015] In some embodiments, D1 gradually increases from one end of the extension portion close to the disc body toward the other end thereof.

[0016] In some embodiments, the extensions are arranged at intervals along the circumference of the disk body; a first groove with one side open is formed between two adjacent extensions; and the first groove is recessed away from the plate body toward the disk body to form a second groove.

[0017] In some embodiments, the backing plate unit further includes lubrication holes; the lubrication holes are arranged at intervals along the circumference of the plate body; and the lubrication holes are disposed in the area between two adjacent extension portions.

[0018] In some embodiments, a projection of the third rivet hole partially coincides with a projection of the extension portion.

[0019] In a second aspect, the present invention provides a plunger pump, the plunger pump comprising any one of the sliding assemblies in the first aspect, the plunger pump further comprising:

[0020] A plunger assembly, the plunger assembly comprising a piston cylinder unit, a piston unit, a sliding shoe, and a transmission shaft; the piston cylinder unit comprising a cylinder body and a piston hole; the piston hole penetrates the cylinder body; the piston holes are arranged at intervals along the circumference of the cylinder body; the piston unit comprises a piston rod and a ball head; one end of the piston rod extends into the piston hole and is slidably connected to the piston hole; one end of the piston rod away from the piston hole is fixedly connected to the ball head; the sliding shoe is covered on the outer peripheral wall of the ball head;

[0021] A housing assembly, the housing assembly comprising an outer shell and a swash plate; the transmission shaft sequentially penetrates the swash plate, the sliding assembly and the cylinder body along the same central axis; the swash plate, the sliding assembly and the plunger assembly are spaced apart along the transmission shaft in the internal chamber of the outer shell; the sliding assembly is movably connected to the transmission shaft; the end of the sliding shoe away from the ball head is detachably connected to the sliding assembly; one side of the swash plate is detachably connected to a side of the plate body away from the disc body.

[0022] In some embodiments, the sliding shoe includes a sliding portion and a connecting portion; one end of the sliding portion is fixedly connected to one end of the connecting portion; the sliding portion is arranged between the plate body and the extension portion; one end of the connecting portion away from the sliding portion covers the outer peripheral wall of the ball head; the outer peripheral wall of the connecting portion abuts against the inner peripheral wall of the disc body.

[0023] In order to solve the problem of easy wear between the sliding assembly and the sliding shoe, the present invention has the following advantages:

[0024] The sliding assembly may include a pad unit, a partition unit, a chuck unit, and a rivet. The plate body of the pad unit, the partition ring of the partition unit, and the disk body of the chuck unit may be abutted against the side walls in sequence. The rivet may pass through the first rivet hole, the second rivet hole, and the third rivet hole in sequence to rivet the plate body, the partition ring, and the disk body. D1 may be the distance between the side wall of the extension portion close to the plate body and the side wall of the plate body close to the extension portion when the side walls of the plate body, the partition ring, and the disk body abut against each other in sequence before riveting, and D2 may be the thickness of the partition ring. When the riveting force generated during riveting acts on the disk body, since the end of the extension portion away from the disk body is spaced from the partition ring, the end of the extension portion away from the disk body may be tilted toward the plate body, thereby reducing the distance between the end of the extension portion away from the disk body and the plate body, which may cause the sliding shoe to rotate unsmoothly relative to the sliding assembly and cause a risk of jamming, affecting the normal operation of the plunger pump. Therefore, D1 can be set larger than D2, so that after riveting, the distance between the end of the extension away from the disc body and the plate body is reduced, but the gap between the sliding shoe and the sliding assembly is still not affected, so that the sliding shoe can rotate normally relative to the sliding assembly. In this way, the problem of easy wear between the sliding assembly and the sliding shoe can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a sliding assembly according to an embodiment is shown;

[0026] Figure 2 A schematic diagram of a sliding assembly according to another embodiment is shown;

[0027] Figure 3 A schematic diagram of a sliding assembly according to another embodiment is shown;

[0028] Figure 4 A schematic diagram of a sliding assembly according to another embodiment is shown;

[0029] Figure 5 A schematic diagram of a sliding assembly according to another embodiment is shown;

[0030] Figure 6 A schematic diagram of a plunger pump according to an embodiment is shown.

[0031] Figure markings: 01 sliding assembly; 11 pad unit; 111 plate body; 112 lubrication hole; 113 first rivet hole; 12 partition unit; 121 partition ring; 122 second rivet hole; 13 chuck unit; 131 disk body; 132 extension portion; 133 third rivet hole; 14 rivet; 02 plunger assembly; 21 piston-cylinder unit; 211 cylinder body; 212 piston hole; 22 piston unit; 221 piston rod; 222 ball head; 23 sliding shoe; 231 sliding portion; 232 connecting portion; 24 transmission shaft; 03 housing assembly; 31 outer shell; 32 swash plate. DETAILED DESCRIPTION

[0032] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0033] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0034] The plunger pump drives the piston rod 221 to move back and forth by sliding the slipper 23 relative to the swash plate 32, thereby achieving the actions of oil suction, compression, and oil discharge. The sliding of the slipper 23 relative to the swash plate 32 is accomplished by the sliding assembly 01. The sliding assembly 01 surrounds the slipper 23 to maintain the relative positions of the multiple slippers 23. Since the sliding assembly 01 is an integrated structure, it is easy to make the gap between the slipper 23 and the sliding assembly 01 difficult to control. A gap that is too large or too small will affect the working efficiency of the plunger pump. In order to solve the problem of easy wear between the sliding assembly 01 and the slipper 23, a sliding assembly 01 is proposed. The present embodiment discloses a sliding assembly 01, such as Figure 1 As shown, a sliding assembly 01 may include a backing plate unit 11 , a partition unit 12 , a chuck unit 13 , and a rivet 14 .

[0035] The pad unit 11 may include a plate body 111 and a first rivet hole 113. The first rivet holes 113 may be arranged at intervals along the circumference of the plate body 111. It is convenient to rivet and fix with the separator ring 121 and the disk body 131, thereby enhancing the stability and connection strength of the overall structure. The separator unit 12 may include a separator ring 121 and a second rivet hole 122. The separator ring 121 may be annular. The second rivet hole 122 may be arranged at intervals along the circumference of the separator ring 121, thereby facilitating the connection of the pad unit 11 with the chuck unit 13 by riveting. The separator ring 121 may have a certain supporting effect, thereby enhancing the stability of the entire sliding assembly 01 and preventing deformation or damage during the sliding process.

[0036] The chuck unit 13 may include a disc body 131, an extension portion 132, and a third rivet hole 133. The disc body 131 may be annular. The third rivet holes 133 may be arranged at intervals along the circumference of the disc body 131. One end of the extension portion 132 may be fixedly connected to the inner circumferential wall of the disc body 131, and the other end may extend toward the direction close to the central axis of the disc body 131, so as to facilitate the installation of the sliding shoe 23 between the plate body 111 and the extension portion 132.

[0037] The plate body 111, the separation ring 121, and the disk body 131 can be abutted against the side walls in sequence. The first rivet hole 113, the second rivet hole 122, and the third rivet hole 133 can be set correspondingly to ensure the accurate insertion of the rivet 14 and reduce the riveting quality problems caused by hole position deviation. The end of the extension 132 away from the disk body 131 can be spaced apart from the separation ring 121. The spaced setting can reduce resistance when the sliding shoe 23 slides or adjusts its position, making the sliding action smoother.

[0038] The rivet 14 can pass through the first rivet hole 113, the second rivet hole 122, and the third rivet hole 133 in sequence to rivet the plate 111, the separation ring 121, and the disk 131. The rivet 14 deforms and squeezes the plate 111, the separation ring 121, and the disk 131 to be tightly connected together. This connection method makes the overall structure stable and can withstand greater external forces.

[0039] like Figure 3 As shown, D1 can be the distance between the side wall of the extension part 132 close to the plate body 111 and the side wall of the plate body 111 close to the extension part 132 when the side walls of the plate body 111, the separation ring 121 and the disc body 131 abut against each other in sequence before riveting, and D2 can be the thickness of the separation ring 121. When the riveting force generated during riveting acts on the disc body 131, since the end of the extension part 132 away from the disc body 131 is spaced from the separation ring 121, the end of the extension part 132 away from the disc body 131 will be tilted toward the plate body 111, thereby reducing the distance between the end of the extension part 132 away from the disc body 131 and the plate body 111, which will cause the sliding shoe 23 to rotate unsmoothly relative to the sliding assembly 01 and there is a risk of jamming, affecting the normal operation of the plunger pump. Therefore, D1 can be set larger than D2. In this way, after riveting, the distance between the end of the extension portion 132 away from the disk body 131 and the plate body 111 is reduced, but the gap between the sliding shoe 23 and the sliding assembly 01 is still not affected, so that the sliding shoe 23 can rotate normally relative to the sliding assembly 01 without easily causing wear.

[0040] In some embodiments, Figure 4 As shown, the diameter of the third rivet hole 133 at one end away from the second rivet hole 122 can be gradually reduced toward the other end thereof. In this way, a closer contact can be formed between the hole wall of the third rivet hole 133 and the rivet 14, thereby increasing the contact area of ​​the riveting. This makes the connection portion 232 more secure and reliable, and not easy to loosen. Due to the close fit between the inner wall of the third rivet hole 133 and the rivet 14, the force required for riveting is smaller, and the riveting speed is faster, thereby improving the efficiency of the entire riveting process.

[0041] In some embodiments, Figure 4As shown, A can be the angle between the side of the third rivet hole 133 close to the central axis of the disk body 131 and the central axis of the third rivet hole 133, and B can be the angle between the side of the third rivet hole 133 away from the central axis of the disk body 131 and the central axis of the third rivet hole 133. B can be greater than A. In this way, when the rivet 14 is hammered or pressed, it will be subjected to a force that deviates away from the central axis of the disk body 131. This force will cause the rivet 14 to deflect to a certain extent in the third rivet hole 133 in the direction away from the central axis of the disk body 131. Since the rivet 14 is deformed in the direction away from the central axis of the disk body 131, the contact area between the side of the third rivet hole 133 close to the central axis of the disk body 131 and the hole wall of the third rivet hole 133 is relatively reduced, and the component force received is also reduced, thereby reducing the inclination of the end of the extension part 132 away from the disk body 131 toward the plate body 111 during riveting, and preventing the distance between the side wall of the extension part 132 close to the plate body 111 and the side wall of the plate body 111 close to the extension part 132 from decreasing when the side walls of the plate body 111, the separation ring 121, and the disk body 131 are abutted in sequence. This will not affect the gap between the sliding shoe 23 and the sliding assembly 01, so that the sliding shoe 23 can rotate normally relative to the sliding assembly 01 without easy wear.

[0042] In some embodiments, Figure 4As shown, the aperture of the first rivet hole 113 away from one end of the second rivet hole 122 can be gradually reduced in the direction close to the other end. In this way, a closer contact can be formed between the hole wall of the first rivet hole 113 and the rivet 14, thereby increasing the contact area of ​​the riveting. The connection portion 232 is made more firm and reliable. Due to the close fit between the inner wall of the first rivet hole 113 and the rivet 14, the force required for riveting is smaller, and the riveting speed is faster, thereby improving the efficiency of the entire riveting process. C can be the angle between the side of the first rivet hole 113 close to the central axis of the disk body 131 and the central axis of the first rivet hole 113, and D can be the angle between the side of the first rivet hole 113 away from the central axis of the disk body 131 and the central axis of the first rivet hole 113. D can be greater than C, so that when the rivet 14 is hammered or pressed, it will be subjected to a force that is biased away from the central axis of the disk body 131. This force will cause the rivet 14 to deflect to a certain extent in the first rivet hole 113 in the direction away from the central axis of the disk body 131. As the rivet 14 deforms in the direction away from the central axis of the disk body 131, the contact area between the side of the first rivet hole 113 close to the central axis of the disk body 131 and the hole wall of the first rivet hole 113 is relatively reduced, and the component force received is also reduced, making the riveting more stable and further preventing the distance between the side wall of the extension part 132 close to the plate body 111 and the side wall of the plate body 111 close to the extension part 132 from decreasing when the side walls of the plate body 111, the separation ring 121, and the disk body 131 abut in sequence. This will not affect the gap between the sliding shoe 23 and the sliding assembly 01, so that the sliding shoe 23 can rotate normally relative to the sliding assembly 01 without easy wear.

[0043] In some embodiments, D1 can gradually increase from one end of the extension 132 close to the disk 131 toward the other end thereof. Since the end of the extension 132 away from the disk 131 drops farther than the end of the extension 132 close to the disk 131 toward the plate 111 during riveting, the extension 132 is slightly tilted in this way, and the extension 132 can have a certain deformation space when subjected to riveting pressure, so that when the side walls of the plate 111, the separation ring 121, and the disk 131 are abutted in sequence after riveting, the distance between the side wall of the extension 132 close to the plate 111 and the side wall of the plate 111 close to the extension 132 is within a set range. This will not affect the gap between the sliding shoe 23 and the sliding assembly 01, so that the sliding shoe 23 can rotate normally relative to the sliding assembly 01 without easy wear.

[0044] In some embodiments, the sliding shoe 23 may include a connecting portion 232, and the outer peripheral wall of the connecting portion 232 may abut against the inner peripheral wall of the disk body 131. The extension portions 132 may be arranged at intervals along the circumference of the disk body 131. A first groove with one side open may be formed between two adjacent extension portions 132. The first groove may be used to assemble the sliding shoe 23, and the side of the first groove away from the plate body 111 may be recessed toward the disk body 131 to form a second groove. The second groove may be used to avoid the connecting portion 232 of the sliding shoe 23, providing sufficient space for the connecting portion 232 of the sliding shoe 23 to move, thereby reducing the wear of the sliding shoe 23.

[0045] In some embodiments, Figure 5 As shown, the backing plate unit 11 may further include lubrication holes 112. The lubrication holes 112 may be arranged at intervals along the circumference of the plate body 111, and the lubrication holes 112 may be provided in the region between two adjacent extensions 132. Lubricating oil may be passed through to facilitate lubrication of the sliding shoe 23, which is conducive to the rotation of the sliding shoe 23 relative to the sliding assembly 01 and can extend the service life of the sliding shoe 23.

[0046] In some embodiments, Figure 2 As shown, the projection of the third rivet hole 133 can overlap with the projection of the extension 132, the third rivet hole 133 can be arranged corresponding to the extension 132, and the symmetric center plane of the third rivet hole 133 can overlap with the symmetric center plane of the extension 132. In this way, the riveting position of the disc 131 between the two extensions 132 can be avoided, so as to ensure that the distance between the side wall of the extension 132 close to the plate 111 and the side wall of the plate 111 close to the extension 132 after riveting will not be too large, so as to avoid the sliding shoe 23 from vibrating and falling off during use, so that the connection between the plate 111, the separation ring 121 and the disc 131 is stable, and relative slip is not likely to occur, so as to avoid the asynchronous rotation of the plate 111, the separation ring 121 and the disc 131 during use.

[0047] This embodiment discloses a plunger pump, such as Figure 6As shown, the plunger pump may include: a sliding assembly 01, a plunger assembly 02, and a housing assembly 03. The plunger assembly 02 may include a piston cylinder unit 21, a piston unit 22, a sliding shoe 23, and a transmission shaft 24. The piston cylinder unit 21 may include a cylinder body 211 and a piston hole 212. The piston hole 212 may penetrate the cylinder body 211. The cylinder body 211 may be used to support a piston rod 221 and contain liquid. The piston hole 212 may be arranged at intervals along the circumference of the cylinder body 211, so that a plurality of piston rods 221 may work at different positions at the same time, thereby improving the flow rate and efficiency of the plunger pump. The piston unit 22 may include a piston rod 221 and a ball head 222. One end of the piston rod 221 may extend into the piston hole 212 and may be slidably connected to the piston hole 212. The piston rod 221 may reciprocate in the piston hole 212 to change the volume of the inner cavity of the cylinder body 211 to achieve the suction and discharge of liquid. One end of the piston rod 221 away from the piston hole 212 is fixedly connected to the ball head 222. The sliding shoe 23 can be covered on the outer peripheral wall of the ball head 222, increasing the contact area, dispersing the load and protecting the ball head 222. The plunger pump slides relative to the swash plate 32 through the sliding shoe 23, driving the piston rod 221 to move back and forth. The sliding shoe 23 slides relative to the swash plate 32 through the sliding assembly 01, which can reduce the wear and friction loss between the piston unit 22 and the swash plate 32, extend the life of the piston unit 22, and improve the working efficiency and service life of the plunger pump.

[0048] The housing assembly 03 may include a housing 31 and a swash plate 32. The housing 31 may be used to accommodate and protect the internal components and prevent external impurities from entering the plunger pump. The transmission shaft 24 may sequentially penetrate the swash plate 32, the sliding assembly 01, and the cylinder body 211 along the same central axis, thereby converting the rotary motion of the transmission shaft 24 into the reciprocating motion of the plunger rod, and driving the plunger rod in and out of the cylinder body 211. The swash plate 32, the sliding assembly 01, and the plunger assembly 02 may be arranged in an internal chamber of the housing 31 at intervals along the transmission shaft 24. The sliding assembly 01 may be movably connected to the transmission shaft 24. The end of the sliding shoe 23 away from the ball head 222 may be detachably connected to the sliding assembly 01, so as to facilitate the installation and removal of the sliding shoe 23. One side of the swash plate 32 may be detachably connected to the side of the plate body 111 away from the plate body 131, so as to facilitate the installation of the sliding assembly 01 to the swash plate 32, and facilitate separate maintenance and replacement.

[0049] In some embodiments, the sliding shoe 23 may include a sliding portion 231 and a connecting portion 232. One end of the sliding portion 231 may be fixedly connected to one end of the connecting portion 232. The sliding portion 231 may be disposed between the plate body 111 and the extension portion 132, so that the sliding portion 231 may rotate relative to the sliding assembly 01. One end of the connecting portion 232 away from the sliding portion 231 may cover the outer peripheral wall of the ball head 222, and the outer peripheral wall of the connecting portion 232 may abut against the inner peripheral wall of the disc body 131, thereby ensuring a firm connection between the ball head 222 and the sliding shoe 23. When the plunger pump is driven, the force is transmitted to the ball head 222 through the connecting portion 232, thereby realizing the pumping action.

[0050] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A sliding assembly, characterized in that: The sliding assembly comprises: A backing plate unit, the backing plate unit comprising a plate body and first rivet holes; the first rivet holes are arranged at intervals along the circumference of the plate body; A separation unit, the separation unit comprising a separation ring and second rivet holes; the separation ring is annular; the second rivet holes are arranged at intervals along the circumference of the separation ring; A chuck unit, the chuck unit comprising a disc body, an extension portion, and a third rivet hole; the disc body is annular; the third rivet holes are arranged at intervals along the circumference of the disc body; one end of the extension portion is fixedly connected to the inner circumferential wall of the disc body, and the other end extends toward the direction close to the central axis of the disc body; The side walls of the plate body, the separation ring, and the disk body are abutted in sequence; the first rivet hole, the second rivet hole, and the third rivet hole are arranged correspondingly; the end of the extension part away from the disk body is spaced apart from the separation ring; A rivet, wherein the rivet passes through the first rivet hole, the second rivet hole, and the third rivet hole in sequence to rivet the plate body, the separation ring, and the disc body; Among them, D1>D2, D1 is the distance between the side wall of the extension part close to the plate body and the side wall of the plate body close to the extension part when the side walls of the plate body, the separation ring and the disk body are abutted in sequence before riveting, and D2 is the thickness of the separation ring; D1 gradually increases from one end of the extension part close to the disk body toward the other end thereof.

2. A sliding assembly according to claim 1, characterized in that: The diameter of the third rivet hole gradually decreases from one end away from the second rivet hole toward the other end thereof.

3. A sliding assembly according to claim 2, characterized in that: B>A; wherein A is the angle between the side of the third rivet hole close to the central axis of the disk body and the central axis of the third rivet hole, and B is the angle between the side of the third rivet hole away from the central axis of the disk body and the central axis of the third rivet hole.

4. A sliding assembly according to claim 3, characterized in that: The diameter of the first rivet hole away from one end of the second rivet hole gradually decreases toward the other end thereof; wherein, D>C, C is the angle between the side of the first rivet hole close to the central axis of the disk body and the central axis of the first rivet hole, and D is the angle between the side of the first rivet hole away from the central axis of the disk body and the central axis of the first rivet hole.

5. A sliding assembly according to claim 1, characterized in that: The extensions are arranged at intervals along the circumference of the disk body; a first groove with one side open is formed between two adjacent extensions; and a side of the first groove away from the plate body is recessed toward the disk body to form a second groove.

6. A sliding assembly according to claim 5, characterized in that: The backing plate unit further comprises lubrication holes; the lubrication holes are arranged at intervals along the circumference of the plate body; and the lubrication holes are arranged in the area between two adjacent extension portions.

7. A sliding assembly according to claim 1, characterized in that: The projection of the third rivet hole partially coincides with the projection of the extension portion.

8. A plunger pump, comprising a sliding assembly according to any one of claims 1 to 7, characterized in that: The plunger pump also includes: A plunger assembly, the plunger assembly comprising a piston cylinder unit, a piston unit, a sliding shoe, and a transmission shaft; the piston cylinder unit comprising a cylinder body and a piston hole; the piston hole penetrates the cylinder body; the piston holes are arranged at intervals along the circumference of the cylinder body; the piston unit comprises a piston rod and a ball head; one end of the piston rod extends into the piston hole and is slidably connected to the piston hole; one end of the piston rod away from the piston hole is fixedly connected to the ball head; the sliding shoe is covered on the outer peripheral wall of the ball head; A housing assembly, the housing assembly comprising an outer shell and a swash plate; the transmission shaft sequentially penetrates the swash plate, the sliding assembly and the cylinder body along the same central axis; the swash plate, the sliding assembly and the plunger assembly are spaced apart along the transmission shaft in the internal chamber of the outer shell; the sliding assembly is movably connected to the transmission shaft; the end of the sliding shoe away from the ball head is detachably connected to the sliding assembly; one side of the swash plate is detachably connected to a side of the plate body away from the disc body.

9. A plunger pump according to claim 8, characterized in that: The sliding shoe includes a sliding portion and a connecting portion; one end of the sliding portion is fixedly connected to one end of the connecting portion; the sliding portion is arranged between the plate body and the extending portion; one end of the connecting portion away from the sliding portion covers the outer peripheral wall of the ball head; the outer peripheral wall of the connecting portion abuts against the inner peripheral wall of the disc body.

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