Plug-in pump head assembly of butt joint type segmented plunger rod

Abstract

The invention discloses an inserting pump head assembly of a butt joint type segmented plunger rod, which is used for conveying media, and belongs to the technical field of plunger pumps, the device comprises a plunger pump head and a plunger rod arranged in the pump head, one end, far away from the pump head, of the plunger rod is connected with a plunger rod seat, the plunger rod seat is a cylinder, one end of the cylinder axially extends outwards to form a circular ring body, and the other end of the cylinder is connected with the plunger rod seat. The plunger rod is installed in the circular ring body, the other end of the column body is connected with a plunger, and an installation base hole is axially and inwards formed in the end, connected with the column body, of the plunger. According to the device, the plunger rod can be integrally detached along with the pump head, and the problem that the pump head is difficult to maintain due to the fact that the plunger rod is fixedly connected with the plunger is effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of plunger pumps, and in particular relates to a plug-in pump head assembly of a docking-type segmented plunger rod. Background Art

[0002] A plunger pump is a machine that uses the reciprocating motion of a plunger within a pump cylinder to move fluid. Its core involves fluid mechanics and mechanical engineering. The principle of a plunger pump is that the plunger reciprocates within the pump cylinder, drawing in and out fluid through changes in the sealed volume. This pump offers high pressure, high efficiency, and excellent self-priming capabilities, making it widely used in hydraulic systems, petrochemicals, water treatment, and other fields. However, currently, plunger pumps are difficult to disassemble, repair, and maintain because the plunger and plunger rod are mostly integrated. Furthermore, since the plunger rod cannot be replaced, the plunger pump has a fixed flow rate and a single purpose. The same plunger pump cannot be used for multiple flow requirements, increasing costs.

[0003] Application No. US5403169A discloses a plunger pump, in which there is a pump chamber defined by a cylinder and a plunger that reciprocates in the cylinder, and a first sealing member arranged between the inner surface of the cylinder and the outer surface of the plunger to prevent the liquid in the pump chamber from leaking to the outside, the inner surface of the cylinder and the outer surface of the plunger are not in sliding contact with each other, and a second sealing member is inserted between the first sealing member and the pump chamber. During the suction stroke, the second sealing member is in sliding contact with the outer surface of the plunger to prevent dust generated by wear from flowing from the side of the first sealing member to the pump chamber. During the discharge stroke, a small gap is formed between the second sealing member and the outer surface of the plunger. The first discharge system is arranged between the second sealing member and the first sealing member to discharge any liquid that flows from the pump chamber through the second sealing member to the outside. This prevents the pump liquid from being contaminated by dust, and the patent still has room for improvement.

[0004] It should be noted that the above introduction to the technical background is merely intended to provide a clear and complete description of the technical solutions of this application and facilitate understanding by those skilled in the art. Simply because these solutions are described in the background technology section of this application, it should not be assumed that the above technical solutions are well known to those skilled in the art. Summary of the Invention

[0005] In response to the problems existing in the prior art, the present invention provides a plug-in pump head assembly with a docking-type segmented plunger rod. The device can disassemble the plunger rod together with the pump head, effectively solving the problem of difficulty in maintaining the pump head due to the fixed connection between the plunger rod and the plunger.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: A plug-in pump head assembly with a docking-type segmented plunger rod includes a plunger pump head and a plunger rod arranged in the pump head. The end of the plunger rod away from the pump head is connected to a plunger rod seat. The plunger rod seat is a cylinder. A circular ring extends axially outward from one end of the cylinder. The plunger rod is installed in the circular ring. The other end of the cylinder is connected to a plunger. A mounting base hole is provided axially inward at one end of the plunger connected to the cylinder.

[0007] According to one embodiment of the present invention, the mounting base hole is a cylindrical recess with two opposing square notches on its sidewalls. A pin hole is provided on the outside of the cylindrical recess, and the pin hole is a through-hole. A rod body extends axially outward from one end of the plunger rod seat connected to the plunger. A rectangular block protrudes radially outward from the rod body, the size of which is the same as the square notch. A concave hole is provided on the sidewall of the rod body, coaxial with the pin hole, and a shoulder screw is provided on the pin hole. The mounting base hole is longer than the rod body, and the maximum diameter of the plunger rod seat is the same as the diameter of the plunger.

[0008] First, the plunger rod is fixedly connected to the plunger rod seat. The fixing methods of the plunger rod and the plunger rod seat include but are not limited to heat fitting, bonding, welding, threading, etc. During installation, the rod body extending from the end of the plunger rod seat is plugged into the mounting base hole, and then the shoulder screw is screwed into the recessed hole on the side wall of the rod body on one side of the middle plunger rod seat through the pin hole to fix the plunger rod and the plunger together. The square notch in the mounting base hole is installed in conjunction with the protruding rectangular block of the plunger rod seat, so that the plunger cannot rotate relative to the plunger rod. When the plunger is working, it is axially translated relative to the plunger. The rotation of the plunger in the pump chamber will cause the plunger to be subjected to a force perpendicular to the axial translation. The intersection of these two forces will accelerate the wear of the plunger and reduce the service life of the plunger. Therefore, it is necessary to avoid the rotational movement of the plunger. This structure prevents the plunger and the plunger rod from relative movement and rotation from two angles, that is, avoiding axial translation and axial rotation of the relative position, thereby avoiding disconnection between the plunger and the plunger rod and rotation of the plunger.

[0009] According to one embodiment of the present invention, the pump head is threadedly connected to the pump body, and the pump body is provided with a through hole for mounting with the plunger rod. The pump body is sleeved on the outside of the pump body, and the pump body is provided with a through hole for mounting with the plunger. Through holes are provided on both sides of the pump body, and fastening bolts are provided on the through holes on both sides of the pump body. The side wall of the pump body is provided with a hole groove coaxial with the fastening bolts. A return spring is provided between the pump body and the pump body, and the return spring is fixedly connected to the bottom of the pump body. A peephole is provided on the side wall of the pump body, and the peephole is perpendicular to the plunger. The return spring is coaxial with the plunger and is sleeved on the outside of the plunger.

[0010] The power mechanism pushes the plunger rod, thereby pushing the plunger, causing the plunger to move in one direction, resulting in negative pressure in the working chamber. Oil pipes are provided in the working chamber towards both ends of the pump head, so that the liquid is sucked into the cylinder; when the plunger finishes one stroke and moves in the other direction, the liquid is compressed and the liquid sucked into the cylinder is discharged. Since the plunger performs reciprocating motion, continuous oil supply can be achieved.

[0011] A peephole is provided on the side wall of the pump body. The peephole is a through hole. The plunger rod structure can be directly seen through the peephole, and the connection status and working status of the plunger rod, as well as the status of the lubricating oil, can be observed in real time to determine the time for replacement and maintenance of the plunger rod. The shoulder screw can be directly removed using tools through the through-hole structure, so that the plunger rod can be removed first without removing the pump head, avoiding dangerous situations that may be caused by the connection status of the plunger rod and the plunger when the connection structure between the pump head and the pump body is opened after the pump head is removed, such as sudden power-on and startup of the equipment, or changes in the balance state of the pump body, such as slippage or rolling, which causes the pump head to undergo the same change in balance state through the connection structure of the plunger rod. During the operation of the plunger pump, a large amount of heat will be generated due to the friction between the components. This heat can be discharged through the peephole and the through holes on the pump body and pump head structure, which has the effect of heat dissipation and cooling. Due to thermal expansion and contraction, the heat will increase the gas pressure in the chamber. The pressurized gas is discharged synchronously through the peephole, which also has the function of pressure relief. At the same time, the waste grease on the plunger rod can also flow out of the peephole, prompting personnel for maintenance. When there is oil leakage in the pump chamber, personnel can also know the leaked oil in time through the peephole and check and repair it.

[0012] The peephole has a certain effect in absorbing resonance and sound inside and outside the pump cavity. The specific principle is: the through-hole can change the resonance characteristics of the chamber. The resonant frequency of the chamber is determined by its volume and shape. Adding through-holes will change the volume of the chamber and the transmission path of the internal sound, thereby affecting its resonant frequency. The size and position of the through-holes will affect the reflection and absorption of sound waves in the chamber, thereby changing the resonance characteristics. By adjusting the size and distribution of the apertures, sounds of different frequency bands can be absorbed. Small holes absorb more high-frequency noise because high-frequency sound waves have shorter wavelengths and are more likely to enter the small holes and be absorbed. Large holes absorb more low-frequency noise, mainly because low-frequency sound waves have longer wavelengths and are more likely to bypass the holes and enter the chamber directly. Therefore, according to the range of sound frequencies in different plunger pump cavities, the size and position of the through-holes can be reasonably designed to effectively absorb resonance and sound.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This structure prevents the plunger and the plunger rod from moving and rotating relative to each other from two perspectives, namely, axial translation and axial rotation of the relative position. The plunger rod structure can be directly seen through the peephole, and the connection status and working status of the plunger rod can be observed in real time. This allows the plunger rod to be removed without removing the pump head, avoiding the same change in equilibrium state of the pump head caused by the connection structure between the pump head and the pump body when the pump head is opened after the pump head is removed. The hot gas generated by the operation of the plunger pump will be discharged through the peephole, which has the effect of relieving pressure, dissipating heat and cooling. The peephole has a certain effect of absorbing resonance and sound inside and outside the pump chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0015] Figure 1 This is a schematic diagram of the pump head assembly scheme of the present invention; Figure 2 Schematic cross-sectional view of the pump head assembly of the present invention; Figure 3 This is a schematic diagram of the pump body structure of the present invention; Figure 4 This is a schematic diagram of the plunger rod solution of the present invention; Figure 5 Schematic diagram of the plunger rod connection method of the present invention; Figure 6 Schematic cross-sectional view of the plunger rod of the present invention; Figure 7 This is a cross-sectional schematic diagram of the cooperation between the plunger rod and the pump head of the present invention; Figure 8 This is a schematic diagram of the plunger rod solution of the second embodiment of the present invention; Figure 9 Schematic diagram of the cross section of the plunger rod according to the second embodiment of the present invention.

[0016] Figure numbers: 10-pump body; 101-return spring; 102-bolt through hole; 103-peephole; 20-pump body; 201-fastening bolt; 30-pump head; 301-seal; 302-working chamber; 401-plunger; 402-plunger rod; 403-plunger rod seat; 404-shoulder screw; 405-pin hole; 406-mounting base hole; 501-first magnetic block; 502-second magnetic block; 503-middle connecting rod; 504-plunger rod; 505-plunger. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0018] The following first describes the concepts involved in this application with reference to the accompanying drawings. It should be noted that the following description of each concept is intended only to make the content of this application easier to understand and does not limit the scope of protection of this application. At the same time, the embodiments and features in the embodiments of this application can be combined with each other unless there is a conflict. The following detailed description of this application will be made with reference to the accompanying drawings and in conjunction with the embodiments.

[0019] Example 1 See attached Figure 1-Figure 7 As shown, a plug-in pump head assembly with a docking-type segmented plunger rod includes a plunger pump head 30 and a plunger rod 402 arranged in the pump head 30. The end of the plunger rod 402 away from the pump head 30 is connected to the plunger rod seat 403. The plunger rod seat 403 is a cylinder, and a circular ring body extends axially outward from one end of the cylinder. The plunger rod 402 is installed in the circular ring body, and the other end of the cylinder is connected to a plunger 401. The plunger 401 is connected to the cylinder and an installation base hole 406 is axially inwardly provided at one end thereof.

[0020] Mounting base hole 406 is a cylindrical recess with two opposing square notches on its sidewalls. A pin hole 405 is located on the outside of the cylindrical recess, forming a through-hole. A rod body extends axially outward from one end of the plunger rod base 403, which is connected to the plunger 401. A rectangular block protrudes radially outward from the rod body, the same size as the square notch. A concave hole is located on the sidewall of the rod body, coaxial with the pin hole 405. A shoulder screw 404 is mounted on the pin hole 405. Mounting base hole 406 is longer than the rod body, and the maximum diameter of the plunger rod base 403 is the same as that of the plunger 401.

[0021] First, the plunger rod 402 is fixedly connected to the plunger rod seat 403. The fixing methods of the plunger rod and the plunger rod holder include but are not limited to heat fitting, bonding, welding, threading, etc. During installation, the rod body extending from the end of the plunger rod seat 403 is plugged into the mounting base hole 406, and then the shoulder screw 404 is screwed into the concave hole on the side wall of the rod body on one side of the middle plunger rod seat 403 through the pin hole 405 to fix the plunger rod 402 and the plunger 401 together, wherein the mounting base hole 406 The square notch inside the housing cooperates with the protruding rectangular block of the plunger rod seat 403 to prevent the plunger 401 from rotating relative to the plunger rod 402. During operation, the plunger 401 translates axially relative to the plunger 401. However, the rotation of the plunger 401 within the pump chamber subjects the plunger 401 to a force perpendicular to the axial translation. The interaction of these two forces accelerates the wear of the plunger 401 and reduces the service life of the plunger 401. Therefore, it is necessary to prevent the rotation of the plunger 401. This structure prevents relative movement and rotation between the plunger 401 and the plunger rod 402 from two perspectives: axial translation and axial rotation of the relative position, thereby preventing disconnection between the plunger 401 and the plunger rod 402 and rotation of the plunger 401.

[0022] The pump head 30 is threadedly connected to the pump body 20, which is provided with a through hole for fitting with the plunger rod 402. The pump body 10 is sleeved on the outside of the pump body 20, and the pump body 10 is provided with a through hole for fitting with the plunger 401. Through holes are provided on both sides of the pump body 10, and fastening bolts 201 are provided on the through holes on both sides of the pump body 10. The side wall of the pump body 20 is provided with a hole groove coaxial with the fastening bolts 201. A return spring 101 is provided between the pump body 10 and the pump body 20, and the return spring 101 is fixedly connected to the bottom of the pump body 10. A peephole 103 is provided on the side wall of the pump body 10, and the peephole 103 is perpendicular to the plunger 401. The return spring 101 is coaxial with the plunger 401 and sleeved on the outside of the plunger 401.

[0023] The power mechanism pushes the plunger rod 402, thereby pushing the plunger 401, causing the plunger 401 to move in one direction, resulting in negative pressure in the working chamber 302. The working chamber 302 is provided with oil pipes in the directions of both ends of the pump head 30, so that the liquid is sucked into the cylinder; when the plunger 401 finishes a stroke and moves in the other direction, the liquid is compressed and the liquid sucked into the cylinder is discharged. Since the plunger 401 performs reciprocating motion, continuous oil supply can be achieved.

[0024] A peephole 103 is provided on the side wall of the pump body 10. The peephole 103 is a through hole. The plunger rod 402 structure can be directly seen through the peephole 103, and the connection status and working status of the plunger rod 402, as well as the status of the lubricating oil, can be observed in real time to determine the time for replacing and maintaining the plunger rod 402. The shoulder screw 404 can be directly removed using tools through the through hole structure, so that the plunger rod 402 can be removed first without removing the pump head 30, avoiding dangerous situations that may be caused by the connection status of the plunger rod 402 and the plunger 401 when the connection structure between the pump head 30 and the pump body 20 is opened after the pump head 30 is removed, such as when the equipment is suddenly powered on and started, or the balance state of the pump body 10 changes, such as slipping or rolling, so that the pump head 30 is driven to undergo the same change in balance state through the connection structure of the plunger rod 402. During the operation of the plunger pump, a large amount of heat will be generated due to the friction between the components. The heat can be discharged through the peephole 103 and the through holes on the pump body 20 and the pump body 10 structure, which has the effect of heat dissipation and cooling. Due to thermal expansion and contraction, the heat will increase the gas pressure in the chamber, and the pressurized gas will be discharged synchronously through the peephole 103, so that it also has the function of pressure relief. At the same time, the waste lubricating grease on the plunger rod 402 can also flow out from the peephole 103, prompting personnel for maintenance. When there is oil leakage in the pump chamber, personnel can also know the leaked oil in time through the peephole 103 and check and repair it.

[0025] The peephole 103 has a certain effect of absorbing resonance and sound inside and outside the pump cavity. The specific principle is: the through hole can change the resonance characteristics of the cavity: the resonant frequency of the cavity is determined by its volume and shape. Adding a through hole will change the volume of the cavity and the transmission path of the internal sound part, thereby affecting its resonant frequency. The size and position of the through hole will affect the reflection and absorption of sound waves in the cavity, thereby changing the resonance characteristics. By adjusting the aperture size and distribution, sounds of different frequency bands can be absorbed. Small holes absorb more high-frequency noise because high-frequency sound waves have a shorter wavelength and are more likely to enter the small hole and be absorbed. Large holes absorb more low-frequency noise, mainly because low-frequency sound waves have a longer wavelength and are more likely to bypass the hole and enter the cavity directly. Therefore, according to the range of sound frequencies in the different plunger pump cavities, the through hole size and position can be reasonably designed to effectively absorb resonance and sound.

[0026] At the same time, it should be noted that in this embodiment, the number of plunger rod assemblies consisting of the plunger rod 402, the plunger rod seat 403 and the plunger 401 installed in the plunger pump is 1-4 groups, but the present technical solution is not limited to 1-4 groups, for example, it can be 1 group, 2 groups, 3 groups, 4 groups, 5 groups, 6 groups, 7 groups, 8 groups, 9 groups, 10 groups, 11 groups..., and in actual production work, according to different production needs, different numbers of plunger rod assemblies can be selected for installation and use in conjunction with the plunger pump.

[0027] Example 2 See attached Figure 8-Figure 9As shown, there is another optimization scheme of the present invention, which uses another form of plunger rod assembly to replace the plunger rod part in Example 1. The plunger rod assembly in this embodiment is divided into a plunger 505, an intermediate connecting rod 503, a first magnetic block 501, a second magnetic block 502 and a plunger rod 504, wherein the intermediate connecting rod 503 is fastened to the plunger rod 504, and the connection method and connection process between the various sections of the plunger rod assembly include but are not limited to heat fitting, bonding, and special welding. The first magnetic block 501 is embedded in the end of the intermediate connecting rod 503, and the second magnetic block 502 is embedded in the end of the plunger 505. The first magnetic block 501 and the second magnetic block 502 are magnets and have magnetism. The intermediate connecting rod 503 and the plunger 505 are fixedly installed by magnetic attraction between the two magnetic blocks. In addition, the first magnetic block 501 and the second magnetic block 502 can also be other materials with magnetic adsorption, such as electromagnets, so that one of them is a magnet and the other is an electromagnet. By controlling the power supply of the electromagnet to control its magnetism, the connection and disconnection of the magnet and the electromagnet can be controlled, and then the connection state between the plunger rod 504 and the plunger 505 can be controlled. In detail: for example: the first magnetic block 501 can be a magnet, and the second magnetic block 502 can be an electromagnet. By connecting the wires at one end of the plunger 505, the conductive effect of the metal can be used to control the magnetism of the electromagnet located on the plunger 505 by turning on or off the current, thereby realizing the control of the connection state of the first magnetic block 501 and the second magnetic block 502, and realizing the connection and disconnection between the plunger 505 and the plunger rod 504. It should be noted that this example is only used to describe the embodiment. The first magnetic block 501 can also be an electromagnet, and the second magnetic block 502 can be a magnet. By connecting the wires at one end of the plunger rod 504, the current is transmitted to the first magnetic block 501 through the intermediate connecting rod 503, and the connection state between the plunger 505 and the plunger rod 504 can also be controlled to achieve the same effect. In addition, when the magnetic block is made of conductive magnetic material, there is no requirement for the wiring position. When the conventional plunger rod 504 is disassembled, it needs to be disassembled and assembled in a specific direction and path. When the disassembly angle is offset, due to the interaction force of the connecting structure, it may cause the plunger rod 504 to be unable to be disassembled or even damage the connecting part structure of the plunger rod 504 and the plunger 505. There are certain requirements for the disassembly accuracy. The magnetic connection simplifies the connection structure between the plunger 505 and the plunger rod 504, making it easier to remove the plunger rod 504 along with the pump head. During disassembly, the magnet can be demagnetized using a demagnetizer, and the pump head and the separated plunger rod 504 can then be removed together. Cleaning and maintenance can then be performed, or the plunger rod 504 can be replaced with a different size, allowing for adaptability to different pump heads. During installation, the magnet is first magnetized. The magnetized first magnet 501 and the second magnet 502 will attract each other during installation, guiding the positioning. This simplifies the installation process of the pump head and plunger rod 504, and personnel can complete the disassembly and assembly work without professional training.During the operation of a plunger pump, since most of its components are made of metal, they rub against each other during operation, causing a certain degree of wear and tear. Due to the characteristics of metal materials, when the equipment wears, some small metal debris will inevitably be generated. These metal debris will mix with the oil in the equipment. During operation, they will scrape the plunger rod wall and the pump wall, causing accelerated wear of equipment components, reduced oil functionality, and shortened component life. This invisibly increases costs, requires more frequent maintenance, and affects work efficiency. The design of the magnetic block, on the one hand, simplifies the structure of the plunger rod 504 and simplifies the disassembly and assembly process, reducing costs. On the other hand, the magnetic block can absorb the metal debris generated by the wear of the equipment, thereby purifying the oil, reducing equipment wear, and extending the service life of components. Furthermore, since demagnetizing equipment such as a demagnetizer does not need to come into contact with the magnetic block during demagnetization, when an unexpected situation occurs in the plunger pump, such as switch failure, equipment conduction, etc., and an emergency stop is required, personnel can also eliminate the magnetism of the magnetic block to disconnect the plunger rod 504 from the plunger 505, thereby forcing the plunger pump to stop working and avoid the occurrence of unexpected situations.

[0028] 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 do not impose any form of limitation on the implementation methods of the technology of the present invention. Any person skilled in the art 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 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, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of this application, they can also make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A plug-in pump head assembly with a docking-type segmented plunger rod, comprising a plunger pump head (30) and a plunger rod (402) disposed in the pump head (30), The pump head (30) is threadedly connected to the pump body (20), and the pump body (20) is provided with a through hole for cooperating with the plunger rod (402); the pump body (10) is sleeved on the outside of the pump body (20), and the pump body (10) is provided with a through hole for cooperating with the plunger (401); a return spring (101) is provided between the pump body (10) and the pump body (20), and the return spring (101) is fixedly connected to the bottom of the pump body (10).

2. The plug-in pump head assembly with a docking-type segmented plunger rod according to claim 1, characterized in that: Through holes are provided on both sides of the pump body (10), fastening bolts (201) are provided on the through holes on both sides of the pump body (10), and a hole groove coaxial with the fastening bolts (201) is provided on the side wall of the pump body (20).

3. The plug-in pump head assembly with a docking-type segmented plunger rod according to claim 1, characterized in that: A peephole (103) is provided on the side wall of the pump body (10), and the peephole (103) is perpendicular to the plunger (401).

4. The plug-in pump head assembly with a docking-type segmented plunger rod according to claim 1, characterized in that: The return spring (101) is coaxial with the plunger (401), and the return spring (101) is sleeved on the outside of the plunger (401).

5. The plug-in pump head assembly with a docking-type segmented plunger rod according to claim 1, characterized in that: One end of the plunger rod (402) away from the pump head (30) is connected to a plunger rod seat (403), the plunger rod seat (403) is a column, one end of the column has a circular ring extending axially outward, the plunger rod (402) is mounted in the circular ring, the other end of the column is connected to a plunger (401), and the plunger (401) is connected to one end of the column and is provided with a mounting base hole (406) axially inward.

6. The plug-in pump head assembly with a docking-type segmented plunger rod according to claim 5, characterized in that: The mounting base hole (406) is a cylindrical groove, two square notches are provided on the side walls of the cylindrical groove in opposite directions, and a pin hole (405) is provided on the outer side of the cylindrical groove.

7. The plug-in pump head assembly with a docking-type segmented plunger rod according to claim 6, characterized in that: The plunger rod seat (403) is connected to the plunger (401) at one end, and a rod body is axially extended outward. A rectangular block protrudes radially outward from the rod body, and the size of the rectangular block is the same as the size of the square notch.

8. The plug-in pump head assembly with a docking-type segmented plunger rod according to claim 7, characterized in that: A concave hole is provided on the side wall of the rod body, the concave hole is coaxial with the pin hole (405), and a shoulder screw (404) is provided on the pin hole (405).

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