A plunger sleeve inner wall polishing device

Abstract

The present application relates to the technical field of polishing equipment, and discloses a plunger sleeve inner wall polishing equipment, which comprises a self-locking butt joint mechanism and a linkage polishing mechanism, and the structure comprises a hollow rotating shaft which rotates with a top chuck and is hollow inside, a polishing sleeve which is rotatably installed on the top periphery of the hollow rotating shaft and can polish the plunger sleeve inner wall, and a sector liquid film which rotates with the hollow rotating shaft and can drive the polishing sleeve to rotate. The plunger sleeve inner wall polishing equipment can make the polishing sleeve in a stable state during polishing through the centrifugal force and the limiting of the structure size, and the original part can be replaced by applying force upward during replacement, so that the replacement process is simplified. In addition, the device can control the linkage strength of the polishing sleeve during polishing. Once the polishing resistance of the polishing sleeve is greater than the linkage strength, the polishing sleeve can rotate relative to the rotating part, so that the use safety of the equipment is improved.

Description

Technical Field

[0001] This invention relates to the field of polishing equipment technology, specifically to a plunger sleeve inner wall polishing device. Background Technology

[0002] Plunger sleeves are mostly used as core components in diesel engine fuel injection pumps, high-pressure hydraulic pumps, and high-pressure cleaning pumps. They work with plungers to guide and seal, precisely controlling pressure and quantitatively delivering the medium. During the production process, the inner wall of the plunger sleeve needs to be polished to ensure its accuracy.

[0003] For example, Chinese patent publication number "CN103921210B" discloses "A Polishing Head and Polishing Method for the Inner Wall of a Pipe," whose main structure includes a support cylinder, an expansion tube, and polishing abrasive cloth. A support tube fixing port is provided at the front of the support cylinder, and a pressure nozzle opening is provided at the rear of the support cylinder. The expansion tube is a sealed flexible tube with a pressure nozzle at its rear end. The expansion tube spirally wraps around the outer diameter of the support cylinder, with its front end fixed to the support tube fixing port. The pressure nozzle at the rear end of the expansion tube passes through the pressure nozzle opening of the support cylinder and is fixed to the support cylinder. The polishing abrasive cloth wraps around the outer contour surface of the expansion tube. The beneficial effects of this polishing head and polishing method for the inner wall of a pipe are: reliable working performance, less prone to overheating and locking; good polishing quality, preventing scratches on the inner wall of the pipe due to impurities remaining inside; and convenient operation, eliminating the need for extensive time to adjust the fit between the polishing abrasive cloth and the inner wall of the pipe, significantly improving work efficiency.

[0004] In actual polishing, the polishing abrasive cloth makes rigid contact with the inner wall of the pipe (the polishing abrasive cloth is fixedly installed on the outside of the rotating part, and the rigid connection causes the polishing abrasive cloth to rotate in real time when the rotating part rotates). Once the polishing abrasive cloth gets stuck during the polishing process, a serious safety accident will occur. In addition, when polishing inner walls with different inner diameters, different polishing parts need to be replaced (when the polishing parts are damaged, they also need to be replaced), and the replacement process is cumbersome and the installation efficiency is low. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a plunger sleeve inner wall polishing device. By using centrifugal force and structural dimensional limiting, the polishing sleeve can be kept in a stable state during the polishing process. When replacing, the original part can be replaced by applying upward force, thus simplifying the replacement process. In addition, the device can control the linkage strength of the polishing sleeve during the polishing process. Once the polishing resistance of the polishing sleeve exceeds the linkage strength, the polishing sleeve can rotate relative to the rotating part, thereby improving the safety of the equipment and solving the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a plunger sleeve inner wall polishing device, comprising a support base, a fixing ring fixedly installed above the support base via a support rod, a component mounting port located at the center of the fixing ring, and a drive motor fixedly installed on the upper surface of the support base via a motor mounting base; further comprising a self-locking docking mechanism, the structure of which includes a rotating disk mounted in the component mounting port via bearings and capable of rotating with the rotor of the drive motor, multiple longitudinal locking plates capable of being inserted into the rotating disk and rotating with the rotating disk, a top chuck rotating with the longitudinal locking plates, and a metal plug capable of locking the longitudinal locking plates under centrifugal force; and a linkage polishing mechanism, the structure of which includes a hollow rotating shaft rotating with the top chuck and having a hollow internal structure, a polishing sleeve rotatably installed on the top periphery of the hollow rotating shaft and capable of polishing the inner wall of the plunger sleeve, and a fan-shaped liquid film rotating with the hollow rotating shaft and capable of driving the polishing sleeve to rotate.

[0007] Preferably, the self-locking docking mechanism further includes a first connecting plate integrally disposed at the bottom of the rotating disk and rotating with the rotor of the drive motor. The outer circumferential surface of the rotating disk is mounted in the component mounting port via bearings. The interior of the rotating disk is provided with three longitudinal slots near its edge. The bottom of the top chuck is provided with three longitudinal locking plates arranged in a circular array. Each longitudinal locking plate is provided with a horizontal locking hole in the disk body near its bottom end. The rotating disk is provided with a limit slot at the end of the locking hole near the periphery. The rotating disk is provided with a movable insertion slot at the end of the locking hole near the center. Each movable insertion slot is provided with a metal plug that can move along its axial direction. One end of the metal plug is fixedly installed with a first helical spring. One end of the first helical spring is fixedly installed on the solid wall of the movable insertion slot. A second connecting plate integrally disposed with the top center of the top chuck is provided.

[0008] Preferably, the structural radii of the limiting slot, locking hole, movable insertion slot and metal plug are adapted, and the center lines of the four are on the same straight line, with one end of the center line pointing to and perpendicular to the center line of the rotating disk.

[0009] Preferably, the sum of the lateral depth of the locking hole and the lateral depth of the limiting slot is half the horizontal length of the metal plug.

[0010] Preferably, the sum of the length of the first helical spring in its initial state and the horizontal length of the metal plug is less than the horizontal depth of the movable insertion slot.

[0011] Preferably, the structural shape of the longitudinal slot is adapted to the structural shape of the longitudinal locking plate, and the structural dimensions of the longitudinal slot are adapted to the structural dimensions of the longitudinal locking plate, forming a clearance fit so that the longitudinal locking plate can be slidably inserted along the axial direction of the longitudinal slot.

[0012] Preferably, the linkage polishing mechanism further includes a third connecting plate integrally disposed at the bottom of the hollow rotating shaft and fixedly installed on the top of the second connecting plate. The hollow rotating shaft has a liquid pre-reserved cavity inside. The top of the hollow rotating shaft has a first docking channel connecting to the top of the liquid pre-reserved cavity. The bottom of the circumferential side of the hollow rotating shaft has a liquid compensation channel connecting to the liquid pre-reserved cavity. A connecting bracket is fixedly installed at the bottom and top of the inner circumferential wall of the polishing sleeve. The centers of the two connecting brackets are installed at the corresponding shaft of the hollow rotating shaft through bearings. An inner rotating column that rotates with the hollow rotating shaft is fixedly installed outside the shaft located in the inner cavity of the polishing sleeve. The inner rotating column has a liquid storage cavity inside. A first liquid hole connecting the liquid storage cavity and the liquid pre-reserved cavity is installed in the shaft of the hollow rotating shaft. The circumferential side of the inner rotating column has three fan-shaped embedding ports connecting the liquid storage cavity and the inner cavity of the polishing sleeve. Each fan-shaped embedding port has a fan-shaped liquid film that can expand and deform outwards embedded in it with a sealed edge.

[0013] Preferably, it also includes a liquid pressure control mechanism, the structure of which includes a hollow shell fixedly installed on the top of the No. 1 docking channel and having a hollow internal structure, an internal valve plate placed inside the hollow shell and capable of controlling the opening and closing of the liquid flow state, and an upper permanent magnet and a lower permanent magnet that generate motion damping effect on the internal valve plate.

[0014] Preferably, the liquid pressure control mechanism further includes a component movable cavity disposed inside the hollow shell. The bottom of the hollow shell is provided with a second docking channel fixedly installed at the top of the first docking channel and connecting the first docking channel and the component movable cavity. The other end of the hollow shell is provided with a second liquid hole for discharging liquid. An internal valve plate capable of moving along its axial direction is placed in the component movable cavity. The circumferential side of the internal valve plate is provided with multiple concave structures for liquid flow channels. A sealing gasket is embedded at the bottom center of the liquid flow channels. An upper permanent magnet is embedded at the bottom edge of the internal valve plate. A lower permanent magnet corresponding to the upper permanent magnet is embedded at the bottom of the hollow shell. A second helical spring for resetting downwards is placed on the top of the internal valve plate.

[0015] Preferably, the upper and lower permanent magnets have opposite magnetic poles on their opposite end faces, the second liquid hole is connected to the return oil pipeline of an external hydraulic system, and the bottom bearing area of ​​the built-in valve plate, the magnetic attraction between the upper and lower permanent magnets, and the preload of the second helical spring are matched to make the critical overflow pressure of the liquid pressure control mechanism correspond to the rated slip protection torque of the polishing sleeve.

[0016] Compared with the prior art, the present invention provides a plunger sleeve inner wall polishing device, which has the following beneficial effects: 1. By using centrifugal force and limiting the structural dimensions, the polishing sleeve can be kept in a stable state during the polishing process. When replacing, the original part can be replaced by applying upward force, thus simplifying the replacement process. In addition, the device can control the linkage strength of the polishing sleeve during the polishing process. Once the polishing resistance of the polishing sleeve is greater than the linkage strength, the polishing sleeve can rotate relative to the rotating part, thereby improving the safety of the equipment.

[0017] 2. Equipped with a self-locking docking mechanism, the longitudinal locking plate can be quickly removed by pulling up the top chuck when the machine stops, making disassembly and replacement convenient and efficient. During operation, the drive motor drives the rotating disk to rotate at high speed. The metal plug extends outward due to centrifugal force, overcoming the spring force, and locks into the locking hole of the longitudinal locking plate and the limiting slot of the rotating disk. The centrifugal force self-locking prevents the components from falling off during high-speed rotation. The structure is simple, the locking is reliable, and disassembly and assembly are tool-free, greatly improving the equipment maintenance efficiency and operational stability.

[0018] 3. Equipped with a linkage polishing mechanism, consisting of a hollow rotating shaft, a polishing sleeve, an inner rotating column, a fan-shaped liquid film, and a liquid chamber. The hollow rotating shaft drives the inner rotating column to rotate, and hydraulic pressure causes the fan-shaped liquid film to expand outward and adhere to the inner wall of the polishing sleeve. Torque is transmitted through friction to drive the polishing sleeve to rotate, thus achieving inner wall polishing. The adhesion pressure of the fan-shaped liquid film can be precisely adjusted hydraulically to control the linkage strength. When the polishing resistance exceeds the set value, relative rotation occurs between the polishing sleeve and the hollow rotating shaft to avoid rigid jamming. It combines polishing stability, overload protection capability, and flexibility to adapt to different working conditions. The structure is reliable and has a high safety factor. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the present invention; Figure 3 This is a three-dimensional cross-sectional view of the self-locking docking mechanism in this invention; Figure 4 This is a three-dimensional view of the top chuck and the longitudinal locking plate in this invention. Figure 5 This is a perspective view of the linkage polishing mechanism in this invention; Figure 6 This is a three-dimensional cross-sectional view of the linkage polishing mechanism in this invention; Figure 7 This is a three-dimensional view of the combination of the inner rotating column and the sector-shaped liquid film in this invention; Figure 8 This is a three-dimensional cross-sectional view of the liquid pressure control mechanism in this invention.

[0020] The components include: 1. Support base; 2. Support rod; 3. Fixing ring; 4. Component mounting port; 5. Motor mounting base; 6. Drive motor; 7. Self-locking docking mechanism; 71. Rotary disk; 72. Connecting plate No. 1; 73. Longitudinal slot; 74. Limiting slot; 75. Top chuck; 76. Connecting plate No. 2; 77. Movable insertion slot; 78. Helical spring No. 1; 79. Metal plug; 710. Locking hole; 711. Longitudinal locking plate; 8. Linkage polishing mechanism; 81. Hollow rotating shaft; 82. Connecting plate No. 3; 83. Liquid... 84. Reserved cavity; 85. No. 1 docking channel; 86. Liquid compensation channel; 87. Connecting bracket; 88. Polishing sleeve; 89. Inner rotating column; 80. Liquid storage cavity; 810. Fan-shaped embedded port; 811. No. 1 liquid hole; 812. Fan-shaped liquid film; 91. Liquid pressure control mechanism; 92. Hollow shell; 93. Component moving cavity; 94. No. 2 docking channel; 95. Built-in valve plate; 96. Sealing gasket; 97. Liquid flow channel; 98. Upper permanent magnet; 99. Lower permanent magnet; 90. No. 2 helical spring; 910. No. 2 liquid hole. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1 and Figure 2 A plunger sleeve inner wall polishing device includes a support base 1, a fixing ring 3 fixedly installed on the top of the support base 1 via a support rod 2, a component mounting port 4 located at the center of the fixing ring 3, and a drive motor 6 fixedly installed on the upper surface of the support base 1 via a motor mounting base 5. During operation, the support base 1 needs to be placed on the worktable, preferably in a fixed state, and the drive motor 6 is the power source required for polishing, which needs to have sufficient torsional strength.

[0023] For quick costume changes and self-locking, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 and Figure 4 A self-locking docking mechanism 7 needs to be installed. Its structure includes a rotating disk 71 mounted in the component mounting port 4 via bearings and rotating with the rotor of the drive motor 6; multiple longitudinal locking plates 711 that can be inserted into the rotating disk 71 and rotate with it; a top chuck 75 that rotates with the longitudinal locking plates 711; and a metal plug 79 that can lock the longitudinal locking plates 711 under centrifugal force. When a suitable polishing sleeve 87 needs to be replaced, the top chuck 75 is pulled upwards. The operator only needs to overcome the gravity of the top chuck 75 and the longitudinal locking plates 711 to pull out the corresponding structure. Then, the suitable polishing sleeve 87 and the corresponding structure are inserted into the longitudinal slot 73. It can be changed. When the drive motor 6 is started, its rotor will drive the rotating disk 71 to rotate quickly. The rotating disk 71 will drive the top chuck 75 to rotate through the longitudinal locking plate 711 inserted into the longitudinal slot 73. The top chuck 75 can transmit rotational motion. During the high-speed rotation of the rotating disk 71, the metal plug 79 far from the rotation axis generates centrifugal force. When the centrifugal force is greater than the elastic strength of the first helical spring 78, the metal plug 79 will move in a direction until the metal plug 79 is inserted into the limit slot 74 and the locking hole 710. The metal plug 79 can lock the longitudinal locking plate 711 to prevent it from disengaging during rotation, thereby realizing quick change and self-locking.

[0024] For details regarding the structure of the self-locking docking mechanism 7, please refer to [link / reference]. Figure 3 and Figure 4It also includes a first connecting plate 72 integrally disposed at the bottom of the rotating disk 71 and rotating with the rotor of the drive motor 6. The outer circumference of the rotating disk 71 is mounted in the component mounting port 4 via bearings. The interior of the rotating disk 71 is provided with three longitudinal slots 73 near its edge. The bottom of the top chuck 75 is provided with three longitudinal locking plates 711 arranged in a circular array. Each longitudinal locking plate 711 is provided with a horizontal locking hole 710 in the disk body near its bottom end. The rotating disk 71 is provided with a limit slot 74 at the end of the locking hole 710 near the periphery. The rotating disk 71 is provided with a movable insertion groove 77 at the end of the locking hole 710 near the center. Each movable insertion groove 77 is provided with a metal plug 79 that can move along its axial direction. One end of the metal plug 79 is fixedly installed with a first helical spring 78. One end of the first helical spring 78 is fixedly installed in the movable insertion groove 77. At the solid wall surface, a second connecting plate 76 integrally formed with the top center of the top chuck 75 is provided. The structural radii of the limiting slot 74, locking hole 710, movable insertion slot 77, and metal plug 79 are adapted, and the center lines of the four are on the same straight line, with one end of the center line pointing to and perpendicular to the center line of the rotating disk 71. The sum of the lateral depth of the locking hole 710 and the lateral depth of the limiting slot 74 is half the horizontal length of the metal plug 79. The sum of the length of the first helical spring 78 in the initial state and the horizontal length of the metal plug 79 is less than the horizontal depth of the movable insertion slot 77. The structural shape of the longitudinal slot 73 is adapted to the structural shape of the longitudinal locking plate 711, and the structural dimensions of the longitudinal slot 73 are adapted to the structural dimensions of the longitudinal locking plate 711, forming a clearance fit so that the longitudinal locking plate 711 can slide into the longitudinal slot 73 along the axial direction.

[0025] To achieve polishing with controllable linkage intensity, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7A linkage polishing mechanism 8 needs to be set up. Its structure includes a hollow rotating shaft 81 that rotates with the top chuck 75 and has a hollow interior; a polishing sleeve 87 rotatably mounted on the top periphery of the hollow rotating shaft 81 and capable of polishing the inner wall of the plunger sleeve; and a fan-shaped liquid film 812 that rotates with the hollow rotating shaft 81 and drives the polishing sleeve 87 to rotate. Before operation, liquid needs to be injected into the liquid compensation channel 85 through a hydraulic system. The liquid first enters the interior of the liquid pre-reserved cavity 83, and after flowing, finally enters the interior of the liquid storage cavity 89. Under liquid pressure, the three fan-shaped liquid films 812 expand outwards until the outer surface of the fan-shaped liquid films 812 abuts against the inner circumference of the polishing sleeve 87. By controlling the amount of liquid injected through hydraulic equipment, the fan-shaped liquid films 812 and the polishing sleeve can be controlled. The maximum static friction between 87 and the torsional resistance formed by this maximum static friction is the maximum linkage strength. Controlling this within a reasonable range will stop the liquid injection process. The rotor will drive the hollow shaft 81 to rotate, which in turn will drive the polishing sleeve 87 to rotate rapidly via the inner rotating column 88 and the fan-shaped liquid film 812. The plunger sleeve's hole can then be inserted into the outer periphery of the polishing sleeve 87, and the range of motion of the plunger sleeve will be controlled, allowing the high-speed rotating polishing sleeve 87 to polish the inner wall of the plunger sleeve. During polishing, if the resistance between the polishing sleeve 87 and the inner wall of the plunger sleeve exceeds the maximum linkage strength, the polishing sleeve 87 will be locked, while the hollow shaft 81 can rotate normally until the resistance is less than the maximum linkage strength, at which point polishing can resume.

[0026] For details regarding the specific structure of the linked polishing mechanism 8, please refer to [link / reference needed]. Figure 5 , Figure 6 and Figure 7It also includes a third connecting plate 82, which is integrally disposed at the bottom of the hollow rotating shaft 81 and fixedly installed on the top of the second connecting plate 76. The hollow rotating shaft 81 has a liquid pre-reserved cavity 83 inside. The top of the hollow rotating shaft 81 has a first docking channel 84 connecting to the top of the liquid pre-reserved cavity 83. The bottom of the circumferential side of the hollow rotating shaft 81 has a liquid compensation channel 85 connecting to the liquid pre-reserved cavity 83. A connecting bracket 86 is fixedly installed at the bottom and top of the inner circumferential wall of the polishing sleeve 87, respectively. The centers of the two connecting brackets 86 are mounted on the hollow rotating shaft 81 via bearings. At the corresponding shaft, the hollow rotating shaft 81 has an inner rotating column 88 fixedly installed outside the shaft located in the inner cavity of the polishing sleeve 87, which rotates with it. The inner rotating column 88 has a liquid storage cavity 89 inside. The hollow rotating shaft 81 has a first liquid hole 811 that connects the liquid storage cavity 89 and the liquid reserved cavity 83. The circumferential side of the inner rotating column 88 has three fan-shaped embedding ports 810 that connect the liquid storage cavity 89 and the inner cavity of the polishing sleeve 87. Each fan-shaped embedding port 810 has a fan-shaped liquid film 812 that can expand and deform outwards embedded inside it in a sealed manner.

[0027] To achieve effective control over the maximum linkage intensity, please refer to Figure 1 , Figure 2 and Figure 8A liquid pressure control mechanism 9 needs to be installed. Its structure includes a hollow shell 91 fixedly installed on the top of the first docking channel 84 and having a hollow internal structure; an internal valve plate 94 placed inside the hollow shell 91 and capable of controlling the opening and closing of the liquid flow; and upper permanent magnets 97 and lower permanent magnets 98 that provide motion damping for the internal valve plate 94. During liquid injection and operation, the external hydraulic system continuously or intermittently replenishes the pressure medium into the system through the liquid compensation channel 85. The liquid exerts an upward force on the internal valve plate 94. When the thrust formed by the liquid pressure on the bottom surface of the internal valve plate 94 is greater than the sum of the magnetic attraction between the upper and lower permanent magnets 97 and the downward force of the second helical spring 99, the internal valve plate 94 will move upward and compress the second helical spring 99. At this time, the sealing gasket 95 will move away from the sealing gasket. At the top of the second docking channel 93, the overpressurized liquid flows sequentially along the first docking channel 84, the second docking channel 93, the liquid flow groove 96, and the component moving cavity 92 through the second liquid hole 910 back to the return oil pipeline of the external hydraulic system. When the liquid pressure in the system drops, causing the thrust on the bottom surface of the built-in valve plate 94 to be less than the sum of the magnetic attraction force and the elastic force, the built-in valve plate 94 moves downward to reset under the combined action of the reset elastic force of the second helical spring 99 and the magnetic attraction force. The sealing gasket 95 re-seals the second docking channel 93. Through the automatic pressure replenishment of the external hydraulic system and the dynamic coordination of the overflow pressure relief of the liquid pressure control mechanism 9, the hydraulic pressure in the liquid storage cavity 89 can automatically recover and stabilize at the set value after the overload is eliminated, thereby keeping the maximum linkage strength between the fan-shaped liquid film 812 and the inner wall of the polishing sleeve 87 constant.

[0028] For details regarding the specific structure of the liquid pressure control mechanism 9, please refer to [link / reference needed]. Figure 8It also includes a component movable cavity 92 disposed inside the hollow shell 91. The bottom of the hollow shell 91 is provided with a second docking channel 93, which is fixedly installed at the top of the first docking channel 84 and connects the first docking channel 84 and the component movable cavity 92. The other end of the hollow shell 91 is provided with a second liquid hole 910 for discharging liquid. An internal valve plate 94 capable of moving along its axial direction is placed in the component movable cavity 92. The circumferential side of the internal valve plate 94 is provided with multiple concave liquid flow channels 96 for liquid flow. A sealing gasket 95 is embedded at the center of the bottom end of each liquid flow channel 96, and a sealing gasket 95 is embedded at the bottom edge of the internal valve plate 94. The device has an upper permanent magnet 97, and a lower permanent magnet 98 corresponding to the upper permanent magnet 97 is embedded in the bottom of the hollow shell 91. A second helical spring 99 is placed on the top of the built-in valve plate 94 to reset it downwards. The magnetic poles of the upper permanent magnet 97 and the lower permanent magnet 98 are opposite on their opposite end faces. The second liquid hole 910 is connected to the return oil pipeline of an external hydraulic system. The bottom bearing area of ​​the built-in valve plate 94, the magnetic attraction between the upper permanent magnet 97 and the lower permanent magnet 98, and the preload of the second helical spring 99 are matched to make the critical overflow pressure of the liquid pressure control mechanism 9 correspond to the rated slip protection torque of the polishing sleeve 87.

[0029] When in use, place the support base 1 on the workbench, preferably in a fixed state. Inject liquid into the liquid compensation channel 85 through the hydraulic system. The liquid will first enter the interior of the liquid pre-reserved cavity 83, and after flowing, it will finally enter the interior of the liquid storage cavity 89. Under the liquid pressure, the three fan-shaped liquid films 812 expand outward until the outer surface of the fan-shaped liquid films 812 abuts against the inner circumference of the polishing sleeve 87. By controlling the amount of liquid injected through the hydraulic equipment, the maximum static friction between the fan-shaped liquid films 812 and the polishing sleeve 87 can be controlled. The torsional resistance formed by this maximum static friction is the maximum linkage strength. By controlling it within a reasonable range, the liquid injection work can be stopped. When the drive motor 6 is started, the rotor drives the hollow shaft 81 to rotate. The hollow shaft 81 then drives the polishing sleeve 87 to rotate rapidly through the inner rotating column 88 and the sector-shaped liquid film 812. The sleeve hole of the plunger sleeve can then be inserted into the outer periphery of the polishing sleeve 87, and the range of motion of the plunger sleeve is controlled. This allows the high-speed rotating polishing sleeve 87 to polish the inner wall of the plunger sleeve. During the polishing process, once the resistance between the polishing sleeve 87 and the inner wall of the plunger sleeve exceeds the maximum linkage strength, the polishing sleeve 87 will be locked, while the hollow shaft 81 can rotate normally until the resistance is less than the maximum linkage strength, at which point the polishing work can be carried out again.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A plunger sleeve inner wall polishing device, comprising a support base (1), a fixing ring (3) fixedly installed above the support base (1) via a support rod (2), a component mounting port (4) disposed at the center of the fixing ring (3), and a drive motor (6) fixedly installed on the upper surface of the support base (1) via a motor mounting base (5), characterized in that: It also includes, The self-locking docking mechanism (7) includes a rotating disk (71) that is mounted in the component mounting port (4) by bearings and can rotate with the rotor of the drive motor (6), a plurality of longitudinal locking plates (711) that can be inserted into the rotating disk (71) and rotate with the rotating disk (71), a top chuck (75) that rotates with the longitudinal locking plates (711), and a metal plug (79) that can achieve the locking effect of the longitudinal locking plates (711) under centrifugal force. And a linkage polishing mechanism (8), the structure of which includes a hollow rotating shaft (81) that rotates with the top chuck (75) and has a hollow internal structure, a polishing sleeve (87) that is rotatably installed on the top periphery of the hollow rotating shaft (81) and can polish the inner wall of the plunger sleeve, and a fan-shaped liquid film (812) that rotates with the hollow rotating shaft (81) and can drive the polishing sleeve (87) to rotate.

2. The plunger sleeve inner wall polishing equipment according to claim 1, characterized in that: The self-locking docking mechanism (7) also includes a first connecting plate (72) integrally disposed at the bottom of the rotating disk (71) and rotating with the rotor of the drive motor (6). The outer circumferential surface of the rotating disk (71) is mounted in the component mounting port (4) by bearings. The interior of the rotating disk (71) is provided with three longitudinal slots (73) near its edge. The bottom of the top chuck (75) is provided with three longitudinal locking plates (711) arranged in a ring array. Each of the longitudinal locking plates (711) is provided with a horizontal locking hole (710) in the disk body near its bottom end. The rotating disk (71) has a limit slot (74) at one end of the locking hole (710) near the periphery. The rotating disk (71) has a movable insertion slot (77) at one end of the locking hole (710) near the center. Each movable insertion slot (77) has a metal plug (79) that can move along its axial direction. One end of the metal plug (79) is fixedly installed with a first helical spring (78). One end of the first helical spring (78) is fixedly installed on the solid wall of the movable insertion slot (77). The top chuck (75) has a second connecting plate (76) that is integral with it at the top center.

3. The plunger sleeve inner wall polishing equipment according to claim 2, characterized in that: The structural radii of the limiting slot (74), locking hole (710), movable insertion slot (77) and metal plug (79) are compatible, and the center lines of the four are on the same straight line, with one end of the center line pointing to and perpendicular to the center line of the rotating disk (71).

4. The plunger sleeve inner wall polishing equipment according to claim 3, characterized in that: The sum of the lateral depth of the locking hole (710) and the lateral depth of the limiting slot (74) is half the horizontal length of the metal plug (79).

5. The plunger sleeve inner wall polishing equipment according to claim 4, characterized in that: The sum of the length of the first helical spring (78) in its initial state and the horizontal length of the metal plug (79) is less than the horizontal depth of the movable insertion slot (77).

6. The plunger sleeve inner wall polishing equipment according to claim 5, characterized in that: The structural shape of the longitudinal slot (73) is adapted to the structural shape of the longitudinal locking plate (711), and the structural dimensions of the longitudinal slot (73) are adapted to the structural dimensions of the longitudinal locking plate (711). The two form a clearance fit so that the longitudinal locking plate (711) can slide into the longitudinal slot (73) along the axial direction.

7. The plunger sleeve inner wall polishing equipment according to claim 1, characterized in that: The linkage polishing mechanism (8) also includes a third connecting plate (82) integrally disposed at the bottom of the hollow rotating shaft (81) and fixedly installed on the top of the second connecting plate (76). The hollow rotating shaft (81) has a liquid reserved cavity (83) inside. The top of the hollow rotating shaft (81) has a first docking channel (84) connecting the top of the liquid reserved cavity (83). The bottom of the circumferential side of the hollow rotating shaft (81) has a liquid compensation channel (85) connecting the liquid reserved cavity (83). A connecting bracket (86) is fixedly installed at the bottom and top of the inner circumferential wall of the polishing sleeve (87). The centers of the two connecting brackets (86) are installed at the corresponding shaft of the hollow rotating shaft (81) through bearings. The hollow rotating shaft (81) has an inner rotating column (88) fixedly installed outside the shaft body located in the inner cavity of the polishing sleeve (87), which rotates with it. The inner rotating column (88) has a liquid storage cavity (89) inside. The shaft body of the hollow rotating shaft (81) has a No. 1 liquid hole (811) that connects the liquid storage cavity (89) and the liquid reserved cavity (83). The circumferential side of the inner rotating column (88) has three fan-shaped embedding ports (810) that connect the liquid storage cavity (89) and the inner cavity of the polishing sleeve (87). Each fan-shaped embedding port (810) has a fan-shaped liquid film (812) that can expand and deform outwards embedded inside it.

8. A plunger sleeve inner wall polishing device according to claim 7, characterized in that: It also includes a liquid pressure control mechanism (9), the structure of which includes a hollow shell (91) fixedly installed on the top of the No. 1 docking channel (84) and having a hollow internal structure, an internal valve plate (94) placed inside the hollow shell (91) and capable of controlling the opening and closing of the liquid flow state, and an upper permanent magnet (97) and a lower permanent magnet (98) that generate motion damping effect on the internal valve plate (94).

9. A plunger sleeve inner wall polishing device according to claim 8, characterized in that: The liquid pressure control mechanism (9) also includes a component movable cavity (92) disposed inside the hollow shell (91). The bottom of the hollow shell (91) is provided with a second docking channel (93) which is fixedly installed at the top of the first docking channel (84) and connects the first docking channel (84) and the component movable cavity (92). The other end of the hollow shell (91) is provided with a second liquid hole (910) for discharging liquid. The movable cavity (92) of the component contains an internal valve plate (94) that can move along its axial direction. The circumferential side of the internal valve plate (94) is provided with multiple concave structures for liquid flow channels (96) for liquid flow. A sealing gasket (95) is embedded at the bottom center of the liquid flow channel (96). An upper permanent magnet (97) is embedded at the bottom edge of the internal valve plate (94). A lower permanent magnet (98) corresponding to the upper permanent magnet (97) is embedded at the bottom of the hollow shell (91). A second helical spring (99) is placed on the top of the internal valve plate (94) to reset it downwards.

10. A plunger sleeve inner wall polishing device according to claim 9, characterized in that: The upper permanent magnet (97) and the lower permanent magnet (98) have opposite magnetic poles on their opposite end faces. The second liquid hole (910) is connected to the return oil pipeline of an external hydraulic system. The bottom bearing area of ​​the built-in valve plate (94), the magnetic attraction between the upper permanent magnet (97) and the lower permanent magnet (98), and the preload of the second helical spring (99) are matched to make the critical overflow pressure of the liquid pressure control mechanism (9) correspond to the rated slip protection torque of the polishing sleeve (87).

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