A special tool for pressing the copper sleeve in the cylinder of a plunger pump

Abstract

The present invention discloses a special tool for press-fitting copper sleeves in plunger pump cylinders. The upper end of a rivet connecting shaft is adjustable in height to a drive connecting shaft of a press-fitting machine. The lower end is connected to a guide shaft that can be fixed and slide along a track groove on the guide shaft. A pressing head is fixed to the lower end of the guide shaft. Two or more rubber rings are fixed to the optical axis of the lower end of the pressing head. A reducing drive shaft, a worm gear, and a worm are mounted within a base. A dividing plate is rotatably fixed to the left end of the base. The reducing drive shaft is fixed to the lower end of the dividing plate. Turning a handwheel rotates the reducing drive shaft, driving the dividing plate to index. A support shaft is fixed to the central stepped hole I of the dividing plate, and a limit shaft is fixed to the right end of the base. The plunger pump cylinder is inserted into the support shaft, with its bottom surface supported on the dividing plate. A spring plunger I abuts against the inner hole wall of the dividing plate. The present invention enables automatic indexing and adaptive press-fitting, significantly reducing the difficulty of press-fitting copper sleeves in the plunger pump cylinder and improving press-fitting efficiency.

Description

Technical Field

[0001] The invention belongs to the field of mechanical processing and relates to a special tool for press-fitting a copper sleeve in a plunger pump cylinder. Background Art

[0002] At present, the usage of high-pressure plunger pumps in the world is already very high, and the process equipment for processing various components of plunger pumps is already very mature. However, the copper sleeves in the cylinder of the plunger pump are pressed using a hydraulic press, which has the problems of cumbersome operation and low fault tolerance. Each high-pressure plunger pump generally needs to be pressed with 7 or 9 copper sleeves. This process operation is difficult and the pressing efficiency is low. Summary of the Invention

[0003] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art and provide a special tool for pressing the copper sleeve in the piston pump cylinder. The special tool can automatically index with high indexing accuracy. It is used in conjunction with a press-fitting machine and can adaptively press-fit, which greatly reduces the difficulty of pressing the copper sleeve in the piston pump cylinder and improves the efficiency of the press-fitting work.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: a special tool for press-fitting the copper sleeve in the cylinder of a plunger pump, comprising a base, a dividing plate, a driving device, a sleeve head, a guide shaft, a rivet connecting shaft and a limiting mechanism of the sleeve head;

[0005] The rivet end of the pull rivet connecting shaft is adjustable in height and fixed on the driving connecting shaft of the press, and the lower end of the shaft is connected to a guide shaft that can be fixed and slide along the track groove on it; the lower end of the guide shaft is fixed with a pressing head, the upper end of the pressing head is a mounting plate, the diameter of the optical axis at the lower end matches the diameter of the installed copper sleeve, and two or more rubber rings are embedded and fixed on the optical axis at intervals to prevent the copper sleeve from falling off; the central axis of the pull rivet connecting shaft, the guide shaft and the pressing head coincides with the central axis of the driving connecting shaft of the press;

[0006] The base is provided with a step hole I at the left end, and a step hole II with the same central axis as the step hole I is provided at the center of the indexing plate. The lower end of the indexing plate is rotatably fixed to the upper end surface of the base. The step hole II of the indexing plate is a light hole of medium diameter, a threaded hole of small diameter and a light hole of large diameter from top to bottom. The driving device includes a variable diameter driving shaft, a worm gear, a worm and a handle; the indexing plate and the variable diameter driving shaft are fixed together; the upper end of the variable diameter driving shaft is rotatably fixed in the upper end of the step hole I of the base and extends into the diameter of the indexing plate. The worm gear fixed on the variable diameter drive shaft by a key is installed in the step hole I, and the two ends of the worm used in conjunction with the worm gear are rotatably fixed in the third mounting hole in the base; a hand wheel is installed at one end of the worm that passes through the base, and the hand wheel is installed on the handle; the limiting mechanism of the sleeve head includes a support shaft and a limiting shaft fixed on the right end of the base and flush with the support shaft; the support shaft is a variable diameter shaft, and its lower end is aligned with the step hole II of the indexing plate The light hole in the diameter matches the threaded hole, and its thread is installed in the step hole II of the indexing plate. The upper end of the indexing plate matches the central hole gap of the plunger pump cylinder. The lower end of the upper end of the indexing plate is evenly opened with 3 or more radial installation blind holes on the same circumference, and a spring plunger I is fixed in each installation blind hole; the circumference and upper end surface of the indexing plate are respectively provided with a plurality of indexing grooves and indexing lines with the same number and corresponding positions as the copper sleeve press-fitting holes on the plunger pump cylinder; the positioning plate is fixed on the upper end surface of the base and fixed on the positioning plate. The indexing spring column in the threaded hole on the plate is connected to one of the indexing grooves on the indexing disk; the lower end of the indexing indicator is fixed to the upper end surface of the base, and the indicator on its upper end indicates one of the indexing lines on the indexing disk; the plunger pump cylinder body is passed through the support shaft, and the bottom surface is supported on the indexing disk. The spring plunger I is connected to the wall of its inner hole, and the optical axis of the pressing sleeve head is just aligned with the copper sleeve pressing hole of the plunger pump cylinder. When the optical axis of the pressing sleeve head is pressed into place, the bottom surface of its mounting plate is just in contact with both the support shaft and the upper end surface of the limit shaft.

[0007] Further preferably, the specific structure of the rivet end of the rivet connecting shaft being adjustable in height and fixed on the press drive connecting shaft 1 is: the rivet end of the rivet connecting shaft has a limiting protrusion, the outer diameters of the rivet end detail and the limiting protrusion respectively match the inner diameter and outer diameter of the press drive connecting shaft 1, and the detail is provided with a circle of positioning groove; the rivet end detail is passed through the press drive connecting shaft 1, and the press drive connecting shaft 1 is placed on the limiting protrusion and is locked and fixed in the positioning groove of the rivet end by a ball head screw and a locking nut I threadedly connected to its radial threaded hole.

[0008] Further preferably, the specific structure of the lower end shaft of the rivet connecting shaft is connected to a guide shaft that can be fixed and slid along the track groove thereon: the lower end shaft of the rivet connecting shaft has a vertical sliding groove, and a clamping groove is provided at the uppermost position of the vertical sliding groove; the upper end of the guide shaft has a central sliding groove that matches the lower end shaft of the rivet connecting shaft and a threaded hole is provided at the end; the lower end shaft of the rivet connecting shaft is inserted into the central sliding groove of the guide shaft, and the spring plunger II is threadedly connected to the threaded hole of the guide shaft, and the top end is connected to the vertical sliding groove of the lower end shaft of the rivet connecting shaft and is locked and fixed by the locking nut II; the spring plunger II can slide up and down along the vertical sliding groove, slide to the clamping groove and be plugged and fixed.

[0009] Further preferably, the specific structure of the press sleeve head fixed to the lower end of the guide shaft is: a circle of positioning protrusions and a circle of limiting grooves are provided at the lower end of the guide shaft; the lower end surface of the mounting plate of the press sleeve head is flat, and its upper end has a central fixing groove that matches the shaft below the positioning protrusion of the guide shaft and a positioning threaded hole is opened on the wall; the lower end of the guide shaft is inserted and clamped in the upper end of the mounting plate of the press sleeve head, the limiting screw is connected in the positioning threaded hole and topped in the limiting groove, and is locked and fixed by the locking nut III.

[0010] Further preferably, the centers of the rivet connecting shaft, the guide shaft and the sleeve head are all provided with exhaust holes I, II and III which are interconnected.

[0011] Further preferably, the upper end of the variable diameter drive shaft is rotatably fixed in the upper end of the step hole I of the base, and the lower end is rotatably fixed in the lower end of the step hole I. The specific structure is: the upper end of the variable diameter drive shaft is installed on the upper end of the step hole I of the base by an interference-fitted cylindrical roller bearing, and its lower end is installed on the lower end of the step hole I in sequence by two fourth thrust bearings, a disc spring between the two fourth thrust bearings, a fixed base plate and a fourth spring retaining ring, and both ends of the fixed base plate are installed in another mounting hole at the lower end of the base by a second thrust bearing.

[0012] Further preferably, both ends of the worm used in conjunction with the worm wheel are respectively mounted in the third mounting hole in the base through a deep groove ball bearing and a second spring retaining ring.

[0013] When in use, first put the copper sleeve on the optical axis at the lower end of the pressing head, and the copper sleeve will not fall off under the action of the rubber ring; release the fixing restriction of the guide shaft, and the rivet connecting shaft slides in the guide shaft until the guide shaft and the rivet connecting shaft are extended to the longest; the pressing machine drives the pressing machine to drive the connecting shaft to press the rivet connecting shaft downward until the guide shaft is fixed again, and the rivet connecting shaft, guide shaft and pressing head move downward as a whole, so that the copper sleeve enters the plunger pump cylinder and enters the copper sleeve pressing hole, until the end face of the pressing head contacts the top of the first and second positioning columns to complete the pressing of the first copper sleeve. Then turn the handle to drive the handwheel to rotate, so that the worm drives the worm wheel to rotate, thereby driving the reducing drive shaft to rotate, and the reducing drive shaft drives the indexing plate to rotate until the indexing spring column is connected to the second indexing groove on the indexing plate, and the indexing indicator indicates the second indexing line in the indexing plate. Repeat the above work process until all the copper sleeve press-fitting holes of the plunger pump cylinder body are pressed with copper sleeves, completing the processing of one plunger pump cylinder body and replacing another plunger pump cylinder body.

[0014] The present invention utilizes multiple spring plungers I mounted on the support shaft to ensure the plunger pump cylinder is self-centering and in an adaptive floating state. Even if the copper sleeve on the sleeve head has misaligned positions, the plunger pump cylinder will adapt and be press-fitted, resulting in a high error tolerance. This significantly reduces the difficulty of press-fitting the copper sleeve onto the plunger pump cylinder, improving installation efficiency. Furthermore, the specialized tooling features automatic indexing with excellent stability and high precision, saving time, effort, and labor. The copper sleeve is secured to the sleeve head's optical axis via a rubber ring, preventing it from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0016] Figure 2 It is the front view of the present invention;

[0017] Figure 3 for Figure 1 AA section view;

[0018] Figure 4 for Figure 1 BB cross-sectional view;

[0019] Figure 5 for Figure 1 CC cross-sectional view;

[0020] Figure 6 for Figure 3 An enlarged view of part I;

[0021] Figure 7 It is a top view of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and specific implementations.

[0023] like Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, this embodiment includes a base 35, a dividing plate 19, a driving device, a sleeve pressing head 12, a guide shaft 9, a rivet connecting shaft 5 and a limiting mechanism of the sleeve pressing head.

[0024] The rivet end of the rivet connecting shaft 5 can be adjusted in height and fixed on the press drive connecting shaft 1, and its lower end shaft is connected to a guide shaft 9 that can be fixed and slid along the track groove thereon; its preferred specific structure is: the rivet end 3 of the rivet connecting shaft has a limiting protrusion 5-5, and the outer diameters of the rivet end 3 and the limiting protrusion 5-5 respectively match the inner diameter and outer diameter of the press drive connecting shaft 1, and the detail is provided with a circle of positioning groove 5-4; the rivet end 3 detail is passed through the press drive connecting shaft 1, and the press drive connecting shaft 1 is placed on the limiting protrusion 5-5 and is locked and fixed in the positioning groove 5-4 of the rivet end by a ball head screw 2 threadedly connected to its radial threaded hole and a locking nut I4. The preferred specific structure is as follows: the lower end of the rivet connecting shaft 5 has a vertical sliding groove 5-3, with a snap-in groove 5-2 at the uppermost end of the vertical sliding groove; the upper end of the guide shaft 9 has a central sliding groove that matches the lower end of the rivet connecting shaft 5 and a threaded hole at the end; the lower end of the rivet connecting shaft 5 is inserted into the central sliding groove of the guide shaft 9, and a spring plunger II8 is threadedly connected to the threaded hole of the guide shaft 9, with its top end abutting the vertical sliding groove 5-3 of the lower end of the rivet connecting shaft and locked in place by a lock nut II6; the spring plunger II8 can slide up and down along the vertical sliding groove 5-3 and slide into the snap-in groove 5-2 for insertion and fixation. A pressing sleeve head 12 is fixed to the lower end of the guide shaft 9, and the upper end of the pressing sleeve head 12 is a mounting plate 12-2. The diameter of the optical axis 12-3 at its lower end matches the diameter of the copper sleeve to be installed. Two (or more) rubber rings 15 are embedded and fixed on the optical axis at intervals to prevent the copper sleeve from falling. The preferred specific structure is as follows: the lower end of the guide shaft 9 is provided with a circle of positioning protrusions 9-3 and a circle of limiting grooves 9-2; the lower end surface of the mounting plate 12-2 of the press sleeve head 12 is flat, and its upper end has a central fixing groove that matches the axis below the guide shaft positioning protrusions 9-3, and a positioning threaded hole is opened in the wall; the lower end of the guide shaft 9 is inserted and clamped into the upper end of the mounting plate 12-2 of the press sleeve head 12, and the limiting screw 11 is connected to the positioning threaded hole and abuts against the limiting groove 9-2, and is locked and fixed by the locking nut III 7. The central axis of the rivet connecting shaft 5, guide shaft 9, and press sleeve head 12 coincides with the central axis of the press drive connecting shaft 1. Preferably, the rivet connecting shaft 5, guide shaft 9, and press sleeve head 12 are all centrally opened with interconnected exhaust holes I5-1, II9-1, and III 12-1.

[0025] The base 35 has a stepped hole I 35-1 at its left end, and the indexing plate 19 has a stepped hole II at its center, coaxial with stepped hole I. The lower end of the indexing plate 19 is fixed to the upper end surface of the base 35 via a first thrust bearing 21. A ring of anaerobic adhesive 16 is bonded into the gap between the base 35 and the indexing plate 19 at the outer end of the first thrust bearing 21. Stepped hole II of the indexing plate 19, from top to bottom, consists of a medium diameter hole, a threaded hole with a smaller diameter, and a large diameter hole. The drive device includes a variable diameter drive shaft 28, a worm gear 25, a worm 45, and a handle 43. The indexing plate 19 and variable diameter drive shaft 28 are secured together by a plurality of screws I 38. The upper end of the variable-diameter drive shaft 28 is mounted in the upper end of stepped hole I of the base 35 by an interference fit cylindrical roller bearing 23 and extends into the larger diameter aperture of the indexing plate 19. Its lower end is mounted in the lower end of stepped hole I 35-1 by two fourth thrust bearings 24, a disc spring 31 between the two fourth thrust bearings 24, a fixed base plate 27, and a fourth spring retaining ring 30. The fixed base plate 27 is mounted at both ends in mounting holes 35-2 at the lower end of the base 35 by second thrust bearings 32. The worm gear 25, secured to the variable-diameter drive shaft 28 by a key 26, is mounted in stepped hole I and retained by the first spring retaining ring 22. The worm 45, which works in conjunction with the worm gear 25, is mounted at both ends in the third mounting hole 35-3 of the base 35 by deep groove ball bearings 42 and a second spring retaining ring 41, respectively. A handwheel 44 is mounted on the end of the worm 45 that extends beyond the base 35. A handle 43 is attached to the handwheel 44. The limiting mechanism of the sleeve head includes a support shaft 17 and a limiting shaft 37 fixed flush with the right end of the base 35 by screws II 40. The support shaft 17 is a variable diameter shaft, with its lower end matching the smooth hole and threaded hole in the diameter of the stepped hole II of the indexing plate 19. Its threaded installation is within the stepped hole II of the indexing plate 19. Its upper end is spaced to fit within the center hole of the plunger pump cylinder. Three or more radial mounting blind holes 29 are uniformly arranged below the lower end of the upper end, each containing a spring plunger I 18 in an interference fit. The circumference and upper end surface of the indexing plate 19 are respectively provided with a plurality of indexing grooves 19-1 and indexing lines 19-2, the same number and corresponding positions as the copper sleeve press-fit holes 47 in the plunger pump cylinder 46. Positioning plate 10 is secured to the upper surface of base 35 by screws IV 20. Indexing spring post 34, threaded into a threaded hole in positioning plate 10 by locknut IV 13, is abutted against one of the indexing grooves 36 of indexing disk 19. Indexing indicator 33 is secured at its lower end to the upper surface of base 35 by screws III 14, with its upper indicator facing one of the indexing lines 39 of indexing disk 19. Plunger pump cylinder 46 is threaded onto support shaft 17, with its bottom surface supported on indexing disk 19. Spring plunger I 18 abuts against the inner wall of its bore. The optical axis of press-fitting head 12 is aligned with copper sleeve press-fitting hole 47 of plunger pump cylinder 46. Once the optical axis of press-fitting head 12 is press-fitted into place, the bottom surface of its mounting plate contacts both the support shaft 17 and the upper surface of limit shaft 37.

[0026] Of course, the present invention has many other embodiments. Without violating the spirit and essence of the present invention, those skilled in the art may make corresponding changes and modifications based on the present invention. However, these corresponding changes and modifications should be regarded as improvements of equivalent technologies and fall within the scope of protection of the claims of the present invention.

Claims

1. A special tool for pressing a copper sleeve into a plunger pump cylinder, characterized by: It includes a base, a dividing plate, a driving device, a sleeve pressing head, a guide shaft, a rivet connecting shaft and a limiting mechanism of the sleeve pressing head; The rivet end of the pull rivet connecting shaft is adjustable in height and fixed on the driving connecting shaft of the press, and its lower end is connected to a guide shaft that can be fixed and slide along the track groove on it; a pressing sleeve head is fixed to the lower end of the guide shaft, and the upper end of the pressing sleeve head is a mounting plate, the diameter of the optical axis at the lower end of the pressing sleeve matches the diameter of the installed copper sleeve, and more than two rubber rings are embedded and fixed on the optical axis at intervals to prevent the copper sleeve from falling off; the central axis of the pull rivet connecting shaft, the guide shaft and the pressing sleeve head coincides with the central axis of the driving connecting shaft of the press; The base is provided with a step hole I at the left end, and a step hole II with the same central axis as the step hole I is provided at the center of the indexing plate. The lower end of the indexing plate is rotatably fixed to the upper end surface of the base. The step hole II of the indexing plate is a light hole of medium diameter, a threaded hole of small diameter and a light hole of large diameter from top to bottom. The driving device includes a variable diameter driving shaft, a worm gear, a worm and a handle; the indexing plate and the variable diameter driving shaft are fixed together; the upper end of the variable diameter driving shaft is rotatably fixed in the upper end of the step hole I of the base and extends into the straight line of the indexing plate. The worm gear fixed on the variable diameter drive shaft by a key is installed in the step hole I, and the two ends of the worm used in conjunction with the worm gear are rotatably fixed in the third mounting hole in the base; a handwheel is installed at one end of the worm that passes through the base, and the handwheel is installed on the handle; the limiting mechanism of the sleeve head includes a support shaft and a limiting shaft fixed on the right end of the base and flush with the support shaft; the support shaft is a variable diameter shaft, and its lower end is aligned with the step hole of the indexing plate The light hole in the diameter of Ⅱ matches the threaded hole, and its thread is installed in the step hole Ⅱ of the indexing plate. The upper end of the indexing plate matches the gap with the central hole of the plunger pump cylinder. The lower end of the upper end of the indexing plate is evenly opened with more than 3 radial mounting blind holes on the same circumference, and a spring plunger Ⅰ is fixed in each mounting blind hole; the circumference and upper end surface of the indexing plate are respectively provided with a plurality of indexing grooves and indexing lines with the same number and corresponding positions as the copper sleeve press-fitting holes on the plunger pump cylinder; the positioning plate is fixed on the upper end surface of the base and fixed on the positioning plate. The indexing spring column in the threaded hole on the plate is connected to one of the indexing grooves on the indexing disk; the lower end of the indexing indicator is fixed to the upper end surface of the base, and the indicator on its upper end is facing one of the indexing lines on the indexing disk; the plunger pump cylinder body is passed through the support shaft, and the bottom surface is supported on the indexing disk. The spring plunger I is connected to the inner hole wall, and the optical axis of the pressing sleeve head is just aligned with the copper sleeve pressing hole of the plunger pump cylinder. When the optical axis of the pressing sleeve head is pressed into place, the bottom surface of its mounting plate is just in contact with the upper end surfaces of the support shaft and the limit shaft.

2. The special tool for press-fitting the copper sleeve in the cylinder of the plunger pump according to claim 1 is characterized in that: The specific structure of the rivet end of the rivet connecting shaft being adjustable in height and fixed on the press drive connecting shaft is: the rivet end of the rivet connecting shaft has a limiting protrusion, the outer diameters of the rivet end detail and the limiting protrusion respectively match the inner diameter and outer diameter of the press drive connecting shaft, and the detail is provided with a circle of positioning groove; the rivet end detail is passed through the press drive connecting shaft, the press drive connecting shaft is placed on the limiting protrusion and is locked and fixed in the positioning groove of the rivet end by a ball head screw and a locking nut I threadedly connected to its radial threaded hole.

3. The special tool for press-fitting the copper sleeve in the cylinder of a plunger pump according to claim 1 or 2, characterized in that: The specific structure of the lower end shaft of the rivet connecting shaft being connected to a guide shaft that can be fixed and slide along the track groove thereon is: the lower end shaft of the rivet connecting shaft has a vertical sliding groove, and a clamping groove is provided at the uppermost position of the vertical sliding groove; the upper end of the guide shaft has a central sliding groove that matches the lower end shaft of the rivet connecting shaft and a threaded hole is provided at the end; the lower end shaft of the rivet connecting shaft is inserted into the central sliding groove of the guide shaft, and the spring plunger II is threadedly connected to the threaded hole of the guide shaft, and the top end is connected to the vertical sliding groove of the lower end shaft of the rivet connecting shaft and is locked and fixed by a locking nut II; the spring plunger II can slide up and down along the vertical sliding groove, slide to the clamping groove and be plugged and fixed.

4. The special tool for press-fitting the copper sleeve in the cylinder of a plunger pump according to claim 3 is characterized by: The specific structure of the press sleeve head fixed to the lower end of the guide shaft is: a circle of positioning protrusions and a circle of limiting grooves are provided at the lower end of the guide shaft; the lower end surface of the mounting plate of the press sleeve head is flat, and its upper end has a central fixing groove that matches the shaft below the positioning protrusion of the guide shaft and a positioning threaded hole is opened on the wall; the lower end of the guide shaft is inserted and clamped in the upper end of the mounting plate of the press sleeve head, the limiting screw is connected in the positioning threaded hole and topped in the limiting groove, and is locked and fixed by the locking nut III.

5. The special tool for press-fitting the copper sleeve in the cylinder of a plunger pump according to claim 4, characterized in that: The centers of the pull nail connecting shaft, the guide shaft and the pressing sleeve head are all provided with an exhaust hole I, an exhaust hole II and an exhaust hole III which are interconnected.

6. The special tool for press-fitting the copper sleeve in the cylinder of a plunger pump according to claim 5, characterized in that: The upper end of the variable diameter drive shaft is rotatably fixed in the upper end of the step hole I of the base, and the lower end is rotatably fixed in the lower end of the step hole I. The specific structure is: the upper end of the variable diameter drive shaft is installed on the upper end of the step hole I of the base by an interference-fitted cylindrical roller bearing, and its lower end is installed on the lower end of the step hole I in sequence by two fourth thrust bearings, a disc spring between the two fourth thrust bearings, a fixed base plate and a fourth spring retaining ring. The two ends of the fixed base plate are installed in another mounting hole at the lower end of the base by a second thrust bearing.

7. The special tool for press-fitting the copper sleeve in the cylinder of a plunger pump according to claim 6, characterized in that: Both ends of the worm used in conjunction with the worm wheel are respectively installed in the third installation hole in the base through deep groove ball bearings and second spring retaining rings.

8. The special tool for press-fitting the copper sleeve in the cylinder of a plunger pump according to claim 1 or 2, characterized in that: The specific structure of the press sleeve head fixed to the lower end of the guide shaft is: a circle of positioning protrusions and a circle of limiting grooves are provided at the lower end of the guide shaft; the lower end surface of the mounting plate of the press sleeve head is flat, and its upper end has a central fixing groove that matches the shaft below the positioning protrusion of the guide shaft and a positioning threaded hole is opened on the wall; the lower end of the guide shaft is inserted and clamped in the upper end of the mounting plate of the press sleeve head, the limiting screw is connected in the positioning threaded hole and topped in the limiting groove, and is locked and fixed by the locking nut III.

9. The special tool for press-fitting the copper sleeve in the cylinder of a plunger pump according to claim 1 or 2, characterized in that: The upper end of the variable diameter drive shaft is rotatably fixed in the upper end of the step hole I of the base, and the lower end is rotatably fixed in the lower end of the step hole I. The specific structure is: the upper end of the variable diameter drive shaft is installed on the upper end of the step hole I of the base by an interference-fitted cylindrical roller bearing, and its lower end is installed on the lower end of the step hole I in sequence by two fourth thrust bearings, a disc spring between the two fourth thrust bearings, a fixed base plate and a fourth spring retaining ring. The two ends of the fixed base plate are installed in another mounting hole at the lower end of the base by a second thrust bearing.

10. The special tool for press-fitting the copper sleeve in the cylinder of a plunger pump according to claim 1 or 2, characterized in that: The centers of the rivet connecting shaft, guide shaft and sleeve head are all provided with exhaust holes I, II and III which are interconnected; the two ends of the worm used in conjunction with the worm gear are respectively installed in the third mounting hole in the base through deep groove ball bearings and a second spring retaining ring.

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