Stud split hydraulic end pump head of clamping groove type plunger rod

Abstract

The invention discloses a stud split hydraulic end pump head of a clamping groove type plunger rod, and belongs to the technical field of plunger pumps, the stud split hydraulic end pump head comprises a pump head, a first cavity and a first assembly hole are arranged in the pump head, the first assembly hole is communicated with the first cavity, a plunger rod group is arranged in the first assembly hole, a pump body is connected to the side of the pump head, and the plunger rod group is arranged in the pump body. The pump body comprises a main pump body and an auxiliary pump body which are detachably assembled, coaxial through holes are formed among the main pump body, the auxiliary pump body and the pump head, and first fasteners are arranged in the through holes; the pump body is provided with a second assembly hole communicated with the first assembly hole of the pump head, and the plunger rod set can axially move in the first assembly hole and the second assembly hole. According to the scheme, the disassembly and assembly convenience is high, disassembly and assembly can be automatically calibrated, and the replacement and use requirements of different types of plunger pumps can be met.

Description

Technical Field

[0001] The invention relates to the technical field of plunger pumps, and in particular to a stud-split hydraulic end pump head of a slot-type plunger rod. Background Art

[0002] The plunger pump is an important device in the hydraulic system. It relies on the reciprocating motion of the plunger in the cylinder to change the solvent in the sealed working chamber to achieve oil suction and oil pressure. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow regulation. At present, the industry usually adopts an integrated pump unit. In the current plunger pump production, the plunger rod is fixedly connected to the plunger. Different types of pumps require different plunger structures, which leads to low production efficiency and high material management costs. In order to solve the above problems, many solutions are provided in the prior art. For example, the invention patent with the existing publication number CN104948410B discloses a booster pump and a booster method thereof. The middle part of the inner side of the booster pump body is provided with a middle chamber, a left chamber and a right chamber, and the middle part of the inner wall of the middle chamber is provided with a positioning column, and piston rods are provided on both sides of the positioning column. The piston rod consists of an upper piston rod and a lower piston rod. The piston rod is composed of a cross-sectional area of ​​the upper piston rod that is at least twice the cross-sectional area of ​​the lower piston rod, the upper piston rod is arranged in the middle chamber, and the lower piston rod is arranged in the left chamber and the right chamber; the device provides a certain pressure of oil to the driving chamber of the booster pump through the plunger pump of the prior art, and by controlling the ratio of the cross-sectional area of ​​the upper piston rod to the cross-sectional area of ​​the lower piston rod, a certain pressure of oil is generated in the left chamber and the right chamber at the same time, that is, the higher the ratio of the cross-sectional area of ​​the upper piston rod to the cross-sectional area of ​​the lower piston rod, the higher the oil pressure generated, and at the same time, the device can generate a large flow of oil while generating high pressure, without discontinuity, and meets the actual high-pressure operation needs. The plunger assembly disclosed in the invention generates high oil pressure, has the advantages of high medium transportation efficiency, large transportation flow, and continuous transportation, but the difficulty of assembling and disassembling the plunger pump and the plunger rod in the prior art still has room for improvement. Summary of the invention

[0003] The object of the present invention is to provide a stud-split hydraulic end pump head of a slot-type plunger rod, which is easy to disassemble and assemble, can be automatically calibrated when disassembled and assembled, and can meet the replacement and use requirements of plunger pumps of different models.

[0004] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: a stud split hydraulic end pump head with a slot-type plunger rod, a pump head, a first chamber and a first assembly hole are arranged in the pump head, the first assembly hole is communicated with the first chamber, a plunger rod group is arranged in the first assembly hole, a pump body is connected to the side of the pump head, the pump body includes a main pump body and an auxiliary pump body that can be detachably assembled, a coaxial through hole is arranged between the main pump body, the auxiliary pump body and the pump head, and a first fastener is arranged in the through hole; The pump body has a second assembly hole communicated with the first assembly hole of the pump head, and the plunger rod assembly can axially move in the first assembly hole and the second assembly hole.

[0005] The present invention reduces the overall processing difficulty of the plunger pump by arranging the pump head and the pump body to be detachably connected, and can realize the rapid disassembly, assembly and replacement of the pump head and the pump body during the use of the plunger pump. The clamping force between the main pump body, the auxiliary pump body and the pump head is adjusted by the first fastener to ensure the assembly reliability of the three, and the first fastener is used to correct the assembly alignment accuracy of the main pump body, the auxiliary pump body and the pump head and the assembly gap between the three, so that the overall length of the assembly hole between the pump head and the pump body can be controlled, thereby ensuring that the stroke of the plunger rod group does not change, and maintaining the plunger pump with reliable volumetric efficiency.

[0006] According to one embodiment of the present invention, the plunger rod assembly includes a first rod body and a second rod body connected in a detachable manner, a first stop block is provided at the end of the second rod body adjacent to the first rod body, a second stop block is connected to the side of the first stop block through a connecting rod, a second stop groove is provided at the end surface of the first rod body adjacent to the second rod body, and the second stop groove passes through a side surface of the first rod body. A first stop groove is provided inside the first rod body, the first stop groove is connected to the second stop groove, the first stop groove passes through a side surface of the first rod body, and the direction in which the first stop groove passes through the side surface of the first rod body is the same as the direction in which the second stop groove passes through the side surface of the first rod body.

[0007] By designing the first rod body and the second rod body of the plunger rod group as a plug-in connection scheme, the modular production design of the plunger rod group can be realized, so that rod bodies of different diameters of plunger rod groups of different sizes can be produced, ensuring that the end plug-in sizes are adapted, thereby reducing the manufacturing difficulty of the plunger rod group. The plug-in connection scheme can be used to complete the assembly and disassembly of the plunger rod group without the need for additional auxiliary tools, while also solving the problem of axial spacing or axial separation between the first rod body and the second rod body during the movement of the plunger rod group, and reducing the probability of the first rod body and the second rod body jumping due to separation or loosening of the two, further reducing the possibility of changes in the end position of the plunger rod in the conveying medium cavity, which is conducive to maintaining the stability of medium conveying by stabilizing the degree of cavity change.

[0008] According to one embodiment of the present invention, the second limit block can enter and exit the first limit groove, the connecting rod can enter and exit the second limit groove, the first limit block can abut against the end face of the first rod body, the first limit block is a rotating body structure, and the first limit block and the first rod body have the same diameter.

[0009] After the second limit block is aligned with the first limit groove, the two are plugged and assembled, and the first limit block abuts against the end face of the first rod body, thereby shortening the assembly and the spacing between the end faces of each rod body under the premise of achieving close cooperation between the first rod body and the second rod body. The plug-in solution is adopted and the abutment between the first limit block and the end face of the first rod body provides multi-directional constraints, which is conducive to the rapid assembly of the first rod body and the second rod body and ensures the coaxiality. In this way, the coaxiality of the first rod body and the second rod body can be automatically calibrated during the disassembly and assembly of the plunger rod group.

[0010] According to one embodiment of the present invention, a third rod is plugged into the end of the second rod, and the third rod and the first limit block are respectively arranged at the two ends of the second rod, so as to realize the movement of the third rod relative to the first chamber. The first rod and the second rod can reciprocate under the action of an external driving mechanism, thereby driving the reciprocating motion of the third rod, realizing the reciprocating motion of the plunger rod group to control the negative pressure inside the first chamber, so as to realize medium transportation.

[0011] According to one embodiment of the present invention, the auxiliary pump body is arranged between the main pump body and the pump head, one end of the first fastener is placed in the through hole of the main pump body and fixed to the main pump body, and the other end of the first fastener is placed outside the pump head and equipped with a nut. The nut is preferably a butterfly nut, so that it can be disassembled and assembled by hand, reducing the probability of using tools and reducing the workload of further disinfection of tools and contact parts caused by using tools.

[0012] According to one embodiment of the present invention, a mounting hole connected to the second assembly hole is opened on the side of the pump body, and the mounting hole is arranged perpendicular to the axis of the second assembly hole. The mounting hole can be used to observe the internal situation of the pump body, such as whether the plunger rod group continues to maintain an assembled connection state. Lubricating oil can also be input into the interior through the mounting hole to ensure the continuous movement of the plunger rod group and reduce wear.

[0013] According to one embodiment of the present invention, a clamping assembly is provided between the main pump body and the auxiliary pump body, and the clamping assembly includes a clamping groove body provided on the main pump body, and a clamping block provided on the auxiliary pump body, and the clamping block is assembled corresponding to the clamping groove. The clamping assembly is used to ensure that the through holes on the main pump body, the auxiliary pump body and the pump head correspond to each other, so as to achieve rapid and accurate assembly of the main pump body and the auxiliary pump body and reduce contact wear between the two.

[0014] According to one embodiment of the present invention, a seal is provided inside the pump head and is arranged with the plunger rod assembly, so as to prevent the medium from leaking during the relative movement of the plunger rod assembly.

[0015] Compared with the prior art, the present invention has the following beneficial effects: the present invention reduces the overall processing difficulty of the plunger pump by arranging the pump head and the pump body to be detachably connected, and can realize the rapid disassembly, assembly and replacement of the pump head and the pump body during the use of the plunger pump. The clamping force between the main pump body, the auxiliary pump body and the pump head is adjusted by the first fastener to ensure the assembly reliability of the three, and the first fastener is used to correct the assembly alignment accuracy of the main pump body, the auxiliary pump body and the pump head and the assembly gap between the three, so that the overall length of the assembly hole between the pump head and the pump body is controllable, thereby ensuring that the stroke of the plunger rod group does not change, and maintaining the plunger pump with reliable volumetric efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0017] Figure 1 It is a schematic diagram of a stud-split hydraulic end pump head of a slot-type plunger rod of the present invention; Figure 2 It is a side view of a stud-split hydraulic end pump head of a slot-type plunger rod of the present invention; Figure 3 for Figure 2 Section view in the AA direction; Figure 4 for Figure 2 Cross-sectional view in the middle BB direction; Figure 5 A top view of the plunger rod assembly of the present invention; Figure 6 for Figure 5 Cross-sectional view in CC direction; Figure 7 It is a schematic diagram of the disassembled state of the plunger rod assembly of the present invention; Figure 8 It is a schematic diagram of the assembled state of the plunger rod assembly of the present invention; Fig. 9 Schematic diagram of the plunger rod assembly in Example 3 of the present invention.

[0018] Description of reference numerals: 10. Pump head; 11. Nut; 12. First chamber; 13. First fastener; 20. Pump body; 21. Main pump body; 22. Auxiliary pump body; 23 First hole body; 24. Snap-fit ​​assembly; 30. Plunger rod assembly; 31. First rod body; 311. First limiting groove; 312. Second limiting groove; 32. Second rod body; 321. First limiting block; 322. Second limiting block; 33. Third rod body; 40. Seal; 50. First magnet; 51. Second magnet. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0021] Embodiment 1 like Figure 1-Figure 8 As shown, a stud split hydraulic end pump head with a slot-type plunger rod, a pump head 10, a first chamber 12 and a first assembly hole are provided in the pump head 10, the first assembly hole is communicated with the first chamber 12, a plunger rod group 30 is provided in the first assembly hole, a pump body 20 is connected to the side of the pump head 10, the pump body 20 includes a main pump body 21 and an auxiliary pump body 22 that can be detachably assembled, a coaxial through hole is provided between the main pump body 21, the auxiliary pump body 22 and the pump head 10, and a first fastener 13 is built in the through hole; The pump body 20 has a second assembly hole communicating with the first assembly hole of the pump head 10 , and the plunger rod assembly 30 can axially displace in the first assembly hole and the second assembly hole.

[0022] The present invention reduces the overall processing difficulty of the plunger pump by arranging the pump head 10 and the pump body 20 to be detachably connected, so that the pump head 10 and the pump body 20 can be quickly disassembled, assembled and replaced during use of the plunger pump. The clamping force between the main pump body 21, the auxiliary pump body 22 and the pump head 10 is adjusted by the first fastener 13 to ensure the assembly reliability of the three, and the first fastener 13 is used to correct the assembly alignment accuracy of the main pump body 21, the auxiliary pump body 22 and the pump head 10 and the assembly gap between the three, so that the overall length of the assembly hole between the pump head 10 and the pump body 20 is controllable, thereby ensuring that the stroke of the plunger rod group 30 does not change, and maintaining the plunger pump with reliable volumetric efficiency.

[0023] See attached Figure 7 As shown, the plunger rod assembly 30 includes a first rod body 31 and a second rod body 32 that are detachably connected. A first stopper 321 is provided at the end of the second rod body 32 adjacent to the first rod body 31. The side of the first stopper 321 is connected to a second stopper 322 via a connecting rod. A second stopper groove 312 is provided at the end surface of the first rod body 31 adjacent to the second rod body 32. The second stopper groove 312 passes through a side surface of the first rod body 31. A first stopper groove 311 is provided inside the first rod body 31. The first stopper groove 311 is connected to the second stopper groove 312. The first stopper groove 311 passes through a side surface of the first rod body 31. The direction in which the first stopper groove 311 passes through the side surface of the first rod body 31 is the same as the direction in which the second stopper groove 312 passes through the side surface of the first rod body 31.

[0024] By designing the first rod body 31 and the second rod body 32 of the plunger rod group 30 as a plug-in connection scheme, the modular production design of the plunger rod group 30 can be realized, so that different diameter rod bodies of different sizes of plunger rod groups 30 can be produced, ensuring that the end plug-in sizes are adapted, thereby reducing the manufacturing difficulty of the plunger rod group 30. The plug-in connection scheme can be used to complete the assembly and disassembly of the plunger rod group 30 without additional auxiliary tools, and also solves the problem of axial spacing or axial separation between the first rod body 31 and the second rod body 32 during the movement of the plunger rod group 30, and reduces the probability of the first rod body 31 and the second rod body 32 jumping due to separation or loosening of the two, further reducing the possibility of changes in the end position of the plunger rod 3 in the conveying medium cavity, which is conducive to maintaining the stability of medium conveying by stabilizing the degree of cavity change.

[0025] The second limit block 322 can enter and exit the first limit slot 311 , the connecting rod can enter and exit the second limit slot 312 , the first limit block 321 can abut against the end surface of the first rod body 31 , the first limit block 321 is a rotating body structure, and the first limit block 321 and the first rod body 31 have the same diameter.

[0026] After the second limit block 322 is aligned with the first limit groove 311, the two are plugged and assembled, and the first limit block 321 abuts against the end face of the first rod body 31, so as to shorten the assembly and the spacing between the end faces of each rod body under the premise of achieving close cooperation between the first rod body 31 and the second rod body 32. The plug-in solution and the abutment between the first limit block 321 and the end face of the first rod body 31 provide constraints in multiple directions, which is conducive to the rapid assembly of the first rod body 31 and the second rod body 32 and ensure the coaxiality. In this way, the coaxiality of the first rod body 31 and the second rod body 32 can be automatically calibrated during the disassembly and assembly of the plunger rod group 30.

[0027] A third rod 33 is plugged into the end of the second rod 32. The third rod 33 and the first limit block 321 are respectively arranged at the two ends of the second rod 32 to realize the movement of the third rod 33 relative to the first chamber 12. The first rod 32 and the second rod 31 can reciprocate under the action of an external driving mechanism, thereby driving the reciprocating motion of the third rod 33, realizing the reciprocating motion of the plunger rod group 30 to control the negative pressure inside the first chamber 12, so as to realize medium transportation.

[0028] Embodiment 2: This embodiment provides a further optimization solution based on embodiment 1: Figure 1-4 As shown, the auxiliary pump body 22 is arranged between the main pump body 21 and the pump head 10, one end of the first fastener 13 is placed in the through hole of the main pump body 21 and fixed to the main pump body 21, and the other end of the first fastener 13 is placed outside the pump head 10 and is equipped with a nut 11. The nut 11 is preferably a butterfly nut, so that it can be disassembled and assembled by hand, reducing the probability of using tools and reducing the workload of further disinfection of tools and contact parts caused by using tools.

[0029] A mounting hole 23 connected to the second assembly hole is provided on the side of the pump body 20. The mounting hole 23 is arranged perpendicular to the axis of the second assembly hole. The mounting hole 23 can be used to observe the internal situation of the pump body 20, such as whether the plunger rod group 30 continues to maintain an assembled connection state. Lubricating oil can also be input into the interior through the mounting hole 23 to ensure the continuous movement of the plunger rod group 30 and reduce wear.

[0030] A clamping assembly 24 is provided between the main pump body 21 and the auxiliary pump body 22. The clamping assembly 24 includes a clamping groove body provided on the main pump body 21 and a clamping block provided on the auxiliary pump body 22. The clamping block is assembled correspondingly to the clamping groove. The clamping assembly 24 is used to ensure that the through holes on the main pump body 21, the auxiliary pump body 22 and the pump head 10 correspond to each other, so as to realize the rapid and accurate assembly of the main pump body 21 and the auxiliary pump body 22 and reduce the contact wear between the two.

[0031] The pump head 10 has a seal 40 disposed inside thereof and arranged with the plunger rod assembly 30 , so as to prevent the medium from leaking during the relative movement of the plunger rod assembly 30 .

[0032] In this embodiment, the number of plunger rod groups 30 is at least one, and the specific number is selected according to actual production and use requirements. For example, two plunger rod groups 30 can be a group, and 1 group, 2 groups, 3 groups, 4 groups, 5 groups, 6 groups, 7 groups, 8 groups, 9 groups, 10 groups, 11 groups... are selected according to production requirements.

[0033] Embodiment 3: See attached Fig. 9 As shown, this embodiment provides a replacement solution for the plunger rod group 30, the first rod body 31 is provided with a mounting groove on the side relative to the second rod body 32, and the second magnet 51 is installed in the mounting groove, the second rod body 32 is provided with a mounting groove on the side relative to the first rod body 31, and the second magnet 50 is installed in the mounting groove, which is conducive to positioning the magnets at the center position of their respective rod ends, so that the first magnet 50 and the second magnet 51 and the plunger rod group 30 are subjected to a balanced lateral restraint force during movement, which can reduce the rotation of the components of the plunger rod group 30 due to the eccentricity of the first magnet 50 and the second magnet 51 relative to the plunger rod group 30 at the connection point, thereby reducing the wear of the plunger rod group 30 on the pump head 10 and the internal cavity of the pump body 20 due to the torsion.

[0034] The first magnet 50 and the second magnet 51 can be adsorbed or separated. The first magnet 50 and the second magnet 51 can be demagnetized by a demagnetizer. The demagnetizer enters through the mounting hole 23 and acts on the first magnet 50 and the second magnet 51 .

[0035] The first magnet 50 has a first end face, and the second magnet 51 has a second end face, and the first end face is parallel to the second end face and is arranged in cooperation. The mutually parallel end faces make the first magnet 50 and the second magnet 51 have a relatively stable contact surface, which reduces the difficulty of manufacturing the magnetic block on the one hand, and on the other hand, even if the second rod 32 and the first rod 31 have not achieved the initial positioning before assembly, the rods can be quickly connected through the cooperation of the parallel end faces, which optimizes the posture calibration work before the second rod 32 and the first rod 31 are assembled, and improves the connection efficiency of the second rod 32 and the first rod 31.

[0036] There is a gap between the second rod 32 and the first rod 31 on the outer side where the first magnet 50 and the second magnet 51 are in contact. On the one hand, the design of the magnet makes the structure of the plunger rod group 30 simpler, simplifies the disassembly and assembly process, and reduces costs. On the other hand, the gap between the second rod body 32 and the first rod body 31 can form a storage space, which can absorb metal debris generated by equipment wear, while reducing equipment wear and extending the service life of components. In addition, since demagnetization equipment such as demagnetizers can be out of contact with the magnetic block during demagnetization, when the plunger pump encounters an unexpected situation, such as switch failure, equipment conduction, etc., and needs to stop working urgently, personnel can also eliminate the magnetism of the magnetic block and disconnect the second rod body 32 from the first rod body 31, thereby forcing the plunger pump to stop working and avoid accidents.

[0037] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any form. Any technical personnel in this field may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as technologies or embodiments that are essentially the same as the present invention. This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A stud-type split hydraulic end pump head with a slot-type plunger rod, the pump head (10), the pump head (10) being provided with a first chamber (12) and a first assembly hole, the first assembly hole being in communication with the first chamber (12), the first assembly hole being provided with a plunger rod assembly (30), characterized in that: The pump head (10) is laterally connected to a pump body (20), the pump body (20) comprising a main pump body (21) and an auxiliary pump body (22) that are detachably assembled, a coaxial through hole being provided between the main pump body (21), the auxiliary pump body (22) and the pump head (10), the through hole having a first fastener (13) built therein; The pump body (20) has a second assembly hole connected to the first assembly hole of the pump head (10), and the plunger rod assembly (30) is capable of axial displacement in the first assembly hole and the second assembly hole; The plunger rod assembly (30) comprises a first rod body (31) and a second rod body (32) which are detachably connected, a first limiting block (321) being provided at an end of the second rod body (32) adjacent to the first rod body (31), a second limiting block (322) being connected to the side of the first limiting block (321) via a connecting rod, a second limiting groove (312) being provided at an end surface of the first rod body (31) adjacent to the second rod body (32), and the second limiting groove (312) passing through a side surface of the first rod body (31); A first limiting groove (311) is provided inside the first rod body (31), the first limiting groove (311) is communicated with the second limiting groove (312), the first limiting groove (311) penetrates a side surface of the first rod body (31), and the direction in which the first limiting groove (311) penetrates the side surface of the first rod body (31) is the same as the direction in which the second limiting groove (312) penetrates the side surface of the first rod body (31).

2. The stud-split hydraulic end pump head of a slot-type plunger rod according to claim 1, characterized in that: The second limiting block (322) can enter and exit the first limiting groove (311), the connecting rod can enter and exit the second limiting groove (312), the first limiting block (321) can abut against the end surface of the first rod body (31), the first limiting block (321) is a rotating body structure, and the first limiting block (321) and the first rod body (31) have the same diameter.

3. The stud-split hydraulic end pump head of a slot-type plunger rod according to claim 1, characterized in that: A third rod (33) is plugged into the end of the second rod (32), and the third rod (33) and the first limit block (321) are respectively arranged at two ends of the second rod (32).

4. The stud-split hydraulic end pump head of a slot-type plunger rod according to claim 1, characterized in that: The auxiliary pump body (22) is arranged between the main pump body (21) and the pump head (10); one end of the first fastener (13) is placed in the through hole of the main pump body (21) and is fixed to the main pump body (21); the other end of the first fastener (13) is placed outside the pump head (10) and is provided with a nut (11).

5. The stud-split hydraulic end pump head of a slot-type plunger rod according to claim 1, characterized in that: A mounting hole (23) communicating with the second mounting hole is formed on the side of the pump body (20); the mounting hole (23) is arranged perpendicular to the axis of the second mounting hole.

6. The stud-split hydraulic end pump head of a slot-type plunger rod according to claim 1, characterized in that: A clamping assembly (24) is provided between the main pump body (21) and the auxiliary pump body (22), the clamping assembly (24) comprising a clamping groove body provided on the main pump body (21), and a clamping block provided on the auxiliary pump body (22), the clamping block being assembled corresponding to the clamping groove.

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