Plunger connecting structure and plunger pump

Abstract

The utility model discloses a plunger connecting structure and a plunger pump, and relates to the technical field of plungers. According to the main technical scheme, the plunger rod fixing device comprises a connecting disc, a limiting plate, a plunger rod and a fixing ring, wherein a connecting groove is formed in the connecting disc; the limiting plate is arranged at the bottom of the connecting groove; the plunger rod is arranged at the end, away from the bottom of the connecting groove, of the limiting plate. The plunger rod is sleeved with the fixing ring, the outer wall of the fixing ring is in threaded connection with the groove wall of the connecting groove, and the fixing ring abuts against the end, away from the groove bottom of the connecting groove, of the limiting plate. The fixing ring on the plunger rod is connected into the connecting groove in the connecting disc through the threads, so that a user can adjust the position of the fixing ring by rotating the fixing ring, and the purposes that the user can conveniently separate the connecting disc from the plunger rod, and the disassembly and maintenance convenience of the plunger pump is improved are expected to be achieved. And meanwhile, the limiting plate on the plunger rod abuts against the interior of the connecting groove in the connecting disc through the fixing ring, so that the purposes that the connecting strength between the plunger rod and the connecting disc is enhanced, and then the risk that the plunger rod falls off from the connecting disc in the working process is reduced are expected to be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to plunger technical field, concretely relates to a plunger connecting structure and plunger pump. BACKGROUND

[0002] The plunger pump usually includes driving piece, cylinder body and plunger rod arranged in the cylinder body, wherein the driving end of the driving piece is provided with driving rod, and the driving rod is connected with the plunger rod through the connecting disc.

[0003] In the related art, the connection between the connecting disc and the plunger rod is realized through hot melt connection or threaded connection, when hot melt connection is adopted, the process of hot melt processing of the connecting disc and the plunger rod is relatively complicated, and after processing, the connecting disc and the plunger rod are difficult to separate, which is not convenient for disassembly and maintenance of the plunger pump, when threaded connection is adopted, although the connecting disc and the plunger rod are detachable, the problem of falling of the plunger rod from the connecting disc is prone to occur. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a plunger connecting structure and plunger pump, solve the connecting mode of the connecting disc and the plunger rod of prior art, which is inconvenient for disassembly and maintenance of the plunger pump, and the problem of falling of the plunger rod from the connecting disc is prone to occur.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme:

[0006] A plunger connecting structure, including connecting disc, limit board, plunger rod and fixed ring, one end of connecting disc is provided with connecting groove, limit board is arranged in the groove bottom of connecting groove, plunger rod is arranged in the one end of limit board away from the groove bottom of connecting groove, fixed ring is sleeved on plunger rod, the outer wall of fixed ring is screwed on the groove wall of connecting groove, and the one end of fixed ring away from the groove bottom of connecting groove abuts on limit board.

[0007] Further technical scheme is: the fixed ring is slidably connected with the plunger rod, and the fixed ring is rotatably connected with the plunger rod.

[0008] Further technical scheme is: the fixed ring includes first ring body and second ring body, the first ring body and the second ring body are oppositely arranged on the two sides of the plunger rod, and the side of the first ring body away from the plunger rod and the side of the second ring body away from the plunger rod are screwed on the groove wall of the connecting groove.

[0009] Further technical scheme is: the first ring body and the second ring body are respectively provided with limit slot and limit post at one end close to each other, and the limit post is adapted to be fitted in the limit slot. Further technical scheme is: the first ring body and the second ring body are respectively provided with limit slot and limit post at one end close to each other, and the limit post is adapted to be fitted in the limit slot.

[0010] Further, the plunger connecting structure further comprises a protective pad, the protective pad is sleeved on the plunger rod, the protective pad is arranged on the limiting plate, and one side of the protective pad away from the limiting plate abuts against the fixing ring.

[0011] Further, the plunger connecting structure further comprises a protective pad, the protective pad is sleeved on the plunger rod, the protective pad is arranged on the limiting plate, and one side of the protective pad away from the limiting plate abuts against the fixing ring.

[0012] Further, the plunger connecting structure further comprises a protective pad, the protective pad is sleeved on the plunger rod, the protective pad is arranged on the limiting plate, and one side of the protective pad away from the limiting plate abuts against the fixing ring.

[0013] In a second aspect, a plunger pump is provided, comprising the plunger connecting structure as in the first aspect, the plunger pump further comprising a driving rod and a driving member, the driving rod being connected to the connecting disc of the plunger connecting structure, and an output shaft of the driving member being connected to the driving rod.

[0014] Compared with the prior art, the plunger connecting structure has the following beneficial effects:

[0015] The fixing ring on the plunger rod is connected to the connecting groove on the connecting disc through threads, so that the user can adjust the position of the fixing ring by rotating the fixing ring, so as to conveniently separate the connecting disc and the plunger rod, and improve the convenience of disassembling and repairing the plunger pump. At the same time, the fixing ring abuts the limiting plate on the plunger rod against the connecting groove on the connecting disc, so as to enhance the connection strength between the plunger rod and the connecting disc, and reduce the risk of the plunger rod falling off from the connecting disc during work. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 FIG. 1 is a structural schematic view of a plunger connecting structure according to the present embodiment;

[0017] Figure 2 FIG. 5 is a structural schematic view of a fixing ring for a plunger connecting structure according to the present embodiment;

[0018] Figure 3 FIG. 6 is a structural schematic view of a plunger pump according to the present embodiment.

[0019] Markings in the drawings and corresponding component names:

[0020] 1-Connecting disc; 2-Connecting groove; 3-Limiting plate; 4-Plunger rod;

[0021] 5-Fixing ring; 51-First ring body; 52-Second ring body;

[0022] 6-Limit groove; 7-Limit post; 8-Protective pad; 9-Positioning hole; 10-Positioning groove; 11-Positioning pin; 12-Wrench groove; 13-Drive rod. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Example 1

[0025] This embodiment provides a plunger connection structure, such as Figure 1 As shown, the device includes a connecting plate 1, a limiting plate 3, a plunger rod 4, and a retaining ring 5. One end of the connecting plate 1 has a connecting groove 2. The limiting plate 3 is disposed at the bottom of the connecting groove 2. The plunger rod 4 is disposed at the end of the limiting plate 3 away from the bottom of the connecting groove 2. The retaining ring 5 is sleeved on the plunger rod 4, and the outer wall of the retaining ring 5 is screwed to the groove wall of the connecting groove 2. The retaining ring 5 abuts against the end of the limiting plate 3 away from the bottom of the connecting groove 2.

[0026] For example, during implementation, one end of the connecting plate 1 is provided with a connecting groove 2, and the groove wall of the connecting groove 2 is provided with internal threads.

[0027] The plunger rod 4 is connected to the end of the limiting plate 3 away from the bottom of the connecting groove 2 by means of welding, screwing, or integral molding.

[0028] The retaining ring 5 is sleeved on the plunger rod 4. The outer wall of the retaining ring 5 is provided with external threads, and the external threads on the retaining ring 5 are adapted to the internal threads on the wall of the connecting groove 2.

[0029] In one optional implementation, the retaining ring 5 can be fixed to the plunger rod 4 by means of bolt connection, snap-fit, or other methods. If the retaining ring 5 is fixed to the plunger rod 4, it is necessary to ensure that the retaining ring 5 is in contact with the limiting plate 3 during the process of fixing the retaining ring 5 to the plunger rod 4. In this state, when it is necessary to connect the plunger rod 4 to the connecting plate 1, first place the limiting plate 3 on the plunger rod 4 into the connecting groove 2, and then rotate the structural unit formed by the retaining ring 5, the plunger rod 4, and the limiting plate 3 clockwise until the external thread on the outer wall of the retaining ring 5 is adapted to the internal thread on the groove wall of the connecting groove 2. At this time, the retaining ring 5 is screwed into the connecting groove 2 to connect the plunger rod 4 to the connecting plate 1. When it is necessary to remove the plunger rod 4 from the connecting plate 1, rotate the structural unit formed by the retaining ring 5, the plunger rod 4, and the limiting plate 3 counterclockwise until the retaining ring 5 separates from the connecting groove 2.

[0030] In another alternative embodiment, the fixing ring 5 can be arranged on the plunger rod 4 to slide along the plunger rod 4 from one end of the limiting plate 3 to the direction away from the other end of the limiting plate 3, and the fixing ring 5 can rotate around the axis of the plunger rod 4. In this state, when it is needed to connect the plunger rod 4 to the connecting disc 1, the limiting plate 3 on the plunger rod 4 is first put into the connecting groove 2. Secondly, the fixing ring 5 is slid along the plunger rod 4 to the notch of the connecting groove 2 on the connecting disc 1. Then, the fixing ring 5 is rotated in the clockwise direction until the external thread on the outer wall of the fixing ring 5 is fitted on the internal thread on the groove wall of the connecting groove 2. At this time, the fixing ring 5 is screwed in the connecting groove 2, and the fixing ring 5 abuts against the end of the limiting plate 3 away from the groove bottom of the connecting groove 2, so as to connect the plunger rod 4 to the connecting disc 1. When it is needed to remove the plunger rod 4 from the connecting disc 1, the fixing ring 5 is rotated in the counterclockwise direction until the fixing ring 5 is separated from the connecting groove 2 on the connecting disc 1, and then the plunger rod 4 and the limiting plate 3 are taken out of the connecting groove 2.

[0031] The fixing ring 5 on the plunger rod 4 is screwed into the connecting groove 2 on the connecting disc 1, so that the user can adjust the position of the fixing ring 5 by rotating the fixing ring 5, so as to achieve the purpose of facilitating the user to separate the connecting disc 1 from the plunger rod 4 and improving the convenience of disassembling and repairing the plunger pump. At the same time, the fixing ring 5 abuts the limiting plate 3 on the plunger rod 4 against the connecting groove 2 on the connecting disc 1, so as to achieve the purpose of enhancing the connection strength between the plunger rod 4 and the connecting disc 1, and thereby reducing the risk of the plunger rod 4 falling off from the connecting disc 1 during work.

[0032] Embodiment 2

[0033] In use, when the fixing ring 5 is connected to the plunger rod 4 in a fixed manner, the plunger rod 4 will rotate synchronously with the fixing ring 5 during the rotation of the fixing ring 5, which greatly increases the difficulty for the user to connect or remove the fixing ring 5 from the connecting disc 1. Therefore, in order to reduce the operation difficulty of the user, on the basis of the above-mentioned embodiment 1, in this embodiment, the fixing ring 5 is slidably connected to the plunger rod 4, and the fixing ring 5 is rotatably connected to the plunger rod 4.

[0034] For example, in the implementation process, the fixing ring 5 is sleeved on the plunger rod 4, and there is a certain gap between the inner wall of the fixing ring 5 and the plunger rod 4, so that the fixing ring 5 can slide along the axis of the plunger rod 4, and at the same time, the fixing ring 5 can rotate around the axis of the plunger rod 4.

[0035] During use, when it is necessary to connect the plunger rod 4 to the connecting disc 1, first, the limiting plate 3 on the plunger rod 4 is placed into the connecting groove 2. Secondly, the fixing ring 5 is slid along the plunger rod 4 to the notch of the connecting groove 2 on the connecting disc 1. Then, the fixing ring 5 is rotated in the clockwise direction until the external thread on the outer wall of the fixing ring 5 is fitted on the internal thread on the groove wall of the connecting groove 2. At this time, the fixing ring 5 is screwed in the connecting groove 2, and the fixing ring 5 abuts against the end of the limiting plate 3 away from the groove bottom of the connecting groove 2, so as to connect the plunger rod 4 to the connecting disc 1. When it is necessary to remove the plunger rod 4 from the connecting disc 1, the fixing ring 5 is rotated in the counterclockwise direction until the fixing ring 5 is separated from the connecting groove 2 on the connecting disc 1, and then the plunger rod 4 and the limiting plate 3 are taken out of the connecting groove 2. On the one hand, during the rotation of the fixing ring 5, the plunger rod 4 and the limiting plate 3 do not need to be rotated, so as to reduce the difficulty of the user in connecting or separating the fixing ring 5 to or from the connecting disc 1, and to improve the efficiency of the user in connecting / separating the connecting disc 1 and the plunger rod 4. On the other hand, when the plunger rod 4 vibrates or slightly deviates during work, the stress on the plunger rod 4 is dispersed through the gap between the fixing ring 5 and the plunger rod 4, so as to reduce the risk of wear or damage to the plunger rod 4, the fixing ring 5, etc. caused by forced alignment of the plunger rod 4.

[0036] Embodiment 3

[0037] During use, the plunger rod 4 is connected with the limiting plate 3, and the end of the plunger rod 4 away from the limiting plate 3 usually has a larger diameter or is integrally formed with other connecting structure, so that the fixing ring 5 cannot be sleeved on the end of the plunger rod 4 away from the limiting plate 3. Therefore, in order to facilitate the user in sleeving the fixing ring 5 on the plunger rod 4, as shown in the above embodiment 2, in this embodiment, the fixing ring 5 comprises a first ring body 51 and a second ring body 52; the first ring body 51 and the second ring body 52 are oppositely arranged on the two sides of the plunger rod 4; the side of the first ring body 51 away from the plunger rod 4 and the side of the second ring body 52 away from the plunger rod 4 are screwed on the groove wall of the connecting groove 2. Figure 2

[0038] Exemplarily, during implementation, the above fixing ring 5 comprises the first ring body 51 and the second ring body 52. One side of the first ring body 51 and one side of the second ring body 52 are provided with threads. The threads on one side of the first ring body 51 and the threads on one side of the second ring body 52 can be fitted on the internal threads on the groove wall of the connecting groove 2. Moreover, the threads on one side of the first ring body 51 and the threads on one side of the second ring body 52 correspond to each other, so that when the other side of the first ring body 51 and the other side of the second ring body 52 are oppositely arranged, the threads on one side of the first ring body 51 and the threads on one side of the second ring body 52 together form external threads fitted with the internal threads on the groove wall of the connecting groove 2.

[0039] ​During use, when it is necessary to connect the plunger rod 4 to the connecting plate 1, first, place the limiting plate 3 on the plunger rod 4 into the connecting groove 2. Next, place the first ring 51 and the second ring 52 symmetrically on both sides of the plunger rod 4, ensuring that the threads on the first ring 51 and the second ring 52 are located away from the plunger rod 4. Then, slide the first ring 51 and the second ring 52 along the plunger rod 4 into the groove of the connecting groove 2 on the connecting plate 1. Next, rotate the first ring 51 and the second ring 52 clockwise until the threads on the first ring 51 and the second ring 52 are fitted onto the internal threads on the groove wall of the connecting groove 2. At this point, the first ring 51 and the second ring 52 are screwed into the connecting groove 2, and both abut against the end of the limiting plate 3 away from the bottom of the connecting groove 2, thus connecting the plunger rod 4 to the connecting plate 1. When it is necessary to remove the plunger rod 4 from the connecting plate 1, rotate the first ring 51 and the second ring 52 counterclockwise until both the first ring 51 and the second ring 52 are separated from the connecting groove 2 on the connecting plate 1. Then, remove the plunger rod 4 and the limiting plate 3 from the connecting groove 2. The fixing ring 5 adopts a split structure including the first ring 51 and the second ring 52, so as to achieve the purpose of not needing to fit the fixing ring 5 from one end of the plunger rod 4, even if the diameter of the end of the plunger rod 4 away from the limiting plate 3 is larger or has other integrally formed connecting structures, so that the fixing ring 5 can be easily fitted onto the plunger rod 4.

[0040] Example 4

[0041] like Figure 2 As shown, based on the above embodiment 3, in this embodiment, the first ring body 51 and the second ring body 52 are respectively provided with a limiting groove 6 and a limiting post 7 at their respective ends that are close to each other; the limiting post 7 is adapted to the limiting groove 6.

[0042] For example, during implementation, a limiting groove 6 is provided at the middle of the first ring body 51 near the end of the second ring body 52, and a limiting post 7 is provided at the middle of the second ring body 52 near the end of the first ring body 51.

[0043] During use, when it is necessary to connect the plunger rod 4 to the connecting disc 1, first, the limiting plate 3 on the plunger rod 4 is placed into the connecting groove 2. Secondly, the first ring body 51 and the second ring body 52 are symmetrically placed on both sides of the plunger rod 4, the limiting column 7 on the second ring body 52 is inserted into the limiting groove 6 on the first ring body 51, and the threads on the first ring body 51 and the threads on the second ring body 52 are both located on the side away from the plunger rod 4. Then, the first ring body 51 and the second ring body 52 are both slid along the plunger rod 4 to the slot opening of the connecting groove 2 on the connecting disc 1. Then, the first ring body 51 and the second ring body 52 are rotated in the clockwise direction until the threads on the first ring body 51 and the threads on the second ring body 52 are both fitted on the internal threads on the groove wall of the connecting groove 2. At this time, the first ring body 51 and the second ring body 52 are both screwed into the connecting groove 2, and the first ring body 51 and the second ring body 52 are both abutted at the end away from the groove bottom of the connecting groove 2, so as to connect the plunger rod 4 to the connecting disc 1. When it is necessary to remove the plunger rod 4 from the connecting disc 1, the first ring body 51 and the second ring body 52 are rotated in the counterclockwise direction until the first ring body 51 and the second ring body 52 are separated from the connecting groove 2 on the connecting disc 1, and then the plunger rod 4 and the limiting plate 3 are taken out of the connecting groove 2. The limiting column 7 on the second ring body 52 is fitted into the limiting groove 6 on the first ring body 51, so as to reduce the risk of misalignment of the first ring body 51 and the second ring body 52 in the axial extension direction of the plunger rod 4 during the process of sliding the first ring body 51 and the second ring body 52 along the plunger rod 4 to the slot opening of the connecting groove 2 on the connecting disc 1, and to improve the convenience of the user in synchronously and stably screwing the first ring body 51 and the second ring body 52 into the connecting groove 2, thereby improving the installation efficiency.

[0044] Embodiment 5

[0045] In order to reduce the risk of wear and tear between the fixing ring 5 and the limiting plate 3 during the process of screwing the fixing ring 5 to the groove wall of the connecting groove 2, as shown in Figure 1 Based on the above-mentioned embodiment 2, in this embodiment, the plunger connecting structure further comprises a protective pad 8; the protective pad 8 is sleeved on the plunger rod 4; the protective pad 8 is arranged on the limiting plate 3, and the side of the protective pad 8 away from the limiting plate 3 abuts against the fixing ring 5.

[0046] For example, in the implementation process, the plunger connecting structure further comprises a protective pad 8. The protective pad 8 can be an annular structure made of rubber, plastic or other materials with appropriate elasticity and wear resistance. The protective pad 8 is sleeved on the plunger rod 4, and the protective pad 8 is connected to the end face of the limiting plate 3 close to the plunger rod 4 by screwing, gluing or other methods, and the side of the protective pad 8 away from the limiting plate 3 is used to abut against the fixing ring 5.

[0047] In the process of rotating the fixed ring 5 into the connecting groove 2 in the clockwise direction, as the fixed ring 5 is screwed in, the end of the fixed ring 5 close to the limiting plate 3 gradually fits the protective pad 8 as the screwing depth of the fixed ring 5 increases. At this time, as the screwing depth of the fixed ring 5 further increases, the fixed ring 5 will cause extrusion and friction to the protective pad 8 when the fixed ring 5 rotates. It is expected to achieve the purpose of isolating the fixed ring 5 and the limiting plate 3 by the protective pad 8, reducing the risk of direct contact between the fixed ring 5 and the limiting plate 3, thereby reducing the risk of wear between the fixed ring 5 and the limiting plate 3 due to relative motion (such as rotation of the fixed ring 5), and prolonging the service life of the fixed ring 5 and the limiting plate 3.

[0048] Embodiment 6

[0049] As shown in Figure 1 the above embodiment 1, in this embodiment, the groove wall of the connecting groove 2 is provided with a positioning hole 9; the outer wall of the fixed ring 5 is provided with a positioning groove 10; the positioning groove 10 corresponds to the positioning hole 9; the plunger connecting structure further comprises a positioning pin 11; the positioning pin 11 is connected in the positioning hole 9 and the positioning groove 10.

[0050] For example, in the implementation process, the connecting groove 2 of the connecting disc 1 is provided with a positioning hole 9 on the groove wall. The outer wall of the fixed ring 5 is provided with a positioning groove 10, and the position of the positioning groove 10 corresponds to the position of the positioning hole 9, so that when the fixed ring 5 is screwed into the connecting groove 2 to the fastening position, the positioning groove 10 on the groove wall of the connecting groove 2 can be aligned with the positioning hole 9 on the outer wall of the fixed ring 5.

[0051] The plunger connecting structure further comprises a positioning pin 11, which can be a bolt, a pin or the like. The positioning pin 11 is used to be inserted into the positioning hole 9 and the positioning groove 10.

[0052] In use, when the fixed ring 5 is screwed into the connecting groove 2 to the fastening position, the positioning groove 10 on the groove wall of the connecting groove 2 is aligned with the positioning hole 9 on the outer wall of the fixed ring 5. At this time, the positioning pin 11 is used to be inserted into the positioning hole 9 and the positioning groove 10. It is expected to achieve the purpose of reducing the risk of rotation misplacement of the fixed ring 5 in the process of being screwed into the connecting groove 2, thereby improving the installation precision and reliability. At the same time, it achieves the purpose of reducing the risk of loosening of the fixed ring 5 due to vibration or other external forces in work, thereby enhancing the stability of the plunger connecting structure.

[0053] Embodiment 7

[0054] As shown in Figure 1 the above embodiment 1, in this embodiment, the outer wall of the end of the fixed ring 5 away from the limiting plate 3 is provided with a wrench groove 12.

[0055] Exemplarily, in the implementation process, the outer wall of the fixing ring 5 away from the one end of the limiting plate 3 is provided with a wrench groove 12. The wrench groove 12 is usually flat or hexagonal, etc. The wrench groove 12 can be matched with a wrench tool. It is expected to achieve the purpose of facilitating the user to easily install and disassemble the fixing ring 5 through the tool, thereby improving the work efficiency and convenience.

[0056] Embodiment 8

[0057] The embodiment provides a plunger pump comprising the plunger connecting structure as described in any of embodiments 1-7, such as Figure 3 As shown, the plunger pump further comprises a driving rod 13 and a driving member, the driving rod 13 is connected to the connecting disc 1 of the plunger connecting structure; the output shaft of the driving member is connected to the driving rod 13.

[0058] Exemplarily, in the implementation process, one end of the driving rod 13 is connected to the connecting disc 1 of the plunger connecting structure by welding, screwing, etc. The other end of the driving rod 13 is connected to the output shaft of the driving member (such as a motor, a hydraulic motor, etc.) by welding, bearing connection, coupling connection, etc. It is expected to achieve the purpose of facilitating the user to disassemble and maintain the plunger pump.

[0059] Although the present application has been described with reference to a number of explanatory embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope of the principles disclosed herein. More particularly, many variations and modifications can be made to the embodiments described in the above disclosure, in the drawings, and in the claims, by those skilled in the art, once armed with the above disclosure. Furthermore, depending on the embodiment, certain acts, or events can not be required, but under some circumstances can be useful. In addition, the scope of the application is not intended to be limited to the particular embodiments of the application described.

Claims

1. A plunger connection structure, characterized in that, include: A connecting plate (1) is provided with a connecting groove (2) at one end; A limiting plate (3) is disposed at the bottom of the connecting groove (2); A plunger rod (4) is disposed at one end of the limiting plate (3) away from the bottom of the connecting groove (2); A fixing ring (5) is sleeved on the plunger rod (4). The outer wall of the fixing ring (5) is screwed to the groove wall of the connecting groove (2), and the fixing ring (5) abuts against the end of the limiting plate (3) away from the bottom of the connecting groove (2).

2. The plunger connection structure according to claim 1, characterized in that: The fixed ring (5) is slidably connected to the plunger rod (4), and the fixed ring (5) is rotatably connected to the plunger rod (4).

3. The plunger connection structure according to claim 2, characterized in that: The fixing ring (5) includes a first ring body (51) and a second ring body (52); The first ring (51) and the second ring (52) are disposed opposite to each other on both sides of the plunger rod (4); The side of the first ring (51) away from the plunger rod (4) and the side of the second ring (52) away from the plunger rod (4) are both screwed to the groove wall of the connecting groove (2).

4. The plunger connection structure according to claim 3, characterized in that: The first ring body (51) and the second ring body (52) are respectively provided with a limiting groove (6) and a limiting post (7) at their respective ends that are close to each other; The limiting post (7) is adapted to the limiting groove (6).

5. The plunger connection structure according to claim 2, characterized in that: It also includes a protective pad (8); The protective pad (8) is fitted onto the plunger rod (4); The protective pad (8) is disposed on the limiting plate (3), and the side of the protective pad (8) away from the limiting plate (3) abuts against the fixing ring (5).

6. The plunger connection structure according to claim 1, characterized in that: The groove wall of the connecting groove (2) is provided with positioning holes (9); The outer wall of the fixing ring (5) is provided with a positioning groove (10); The positioning groove (10) corresponds to the positioning hole (9); The plunger connection structure also includes a locating pin (11); The positioning pin (11) is connected to the positioning hole (9) and the positioning groove (10).

7. The plunger connection structure according to claim 1, characterized in that: A wrench groove (12) is provided on the outer wall of the fixed ring (5) at the end away from the limiting plate (3).

8. A plunger pump, characterized in that, The plunger pump, comprising the plunger connection structure as described in any one of claims 1-7, further includes: Drive rod (13), the drive rod (13) is connected to the connecting plate (1) of the plunger connection structure; A driving component, the output shaft of which is connected to the driving rod (13).

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