A high-precision bottom dead center repeatability position accuracy compensation device

Abstract

This invention discloses a high-precision bottom dead center repeatability compensation device in the field of presses. It includes a slider mounted on a press, a crankshaft rotatably mounted above the slider, and several axially spaced connecting rod journals on the crankshaft. Each connecting rod journal is hinged to a connecting rod. The slider is equipped with several sets of adjustment components, each corresponding to a connecting rod. Several laser emitters are located at the bottom of the slider, and several laser receivers are located on the press base corresponding to each laser emitter. This invention improves the accuracy of mold height adjustment and provides intelligent compensation for bottom dead center accuracy when the slider experiences height position errors.

Description

Technical Field

[0001] This invention belongs to the field of presses, and specifically relates to a high-precision bottom dead center repeatability position accuracy compensation device. Background Technology

[0002] The die mounting height of a press refers to the distance between the bottom surface of the slide and the worktable. Due to the different types of plastic forming processes such as stretching, stamping, extrusion, and forging used in presses, or the different sizes of the workpieces being processed, the die mounting height of the press needs to be adjusted to adapt to the requirements of different working conditions.

[0003] In the prior art, there is a press slide mold height adjustment device, patent application number: 202321026226.X; application date: 2023.04.28. Its structure includes a movable plate connecting seat, a press slide, and two servo control motors. Each of the two servo control motors is covered with a silent protective cover. A sealing tube is fixedly installed at one end of each of the two silent protective covers. A magnetic sealing seat is fixedly connected to one end of each of the two sealing tubes. The two sealing tubes are movably connected to two transmission screws, and a connecting tube is fixedly installed between the two sealing tubes. This device adjusts the mold height solely through servo motors, resulting in low adjustment accuracy. Furthermore, when the slide has a height position error, it cannot compensate for the accuracy of the bottom dead center. Summary of the Invention

[0004] The purpose of this invention is to provide a high-precision bottom dead center repeatability position accuracy compensation device, which can improve the mold height adjustment accuracy and intelligently compensate for the bottom dead center accuracy when the slider produces a height position error.

[0005] The objective of this invention is achieved as follows: A high-precision bottom dead center repeatability compensation device includes a slider mounted on a press. A crankshaft is rotatably mounted on the press above the slider. The crankshaft has several axially spaced connecting rod journals, each of which is hinged to a connecting rod. The slider is equipped with several sets of adjustment components, each corresponding to a connecting rod. Each adjustment component includes an adjustment seat fixed on the slider. A sleeve is vertically mounted on the adjustment seat. An adjustment screw is vertically mounted inside the sleeve. The upper end of the adjustment screw extends upward out of the sleeve. An adjustment nut is threadedly connected to the outer circumference of the portion of the adjustment screw inside the sleeve. A worm gear is fixedly mounted on the outer circumference of the adjustment nut. A worm gear meshing with the worm gear is rotatably mounted inside the sleeve. The ends of each worm gear extend out of the sleeve and are connected to a rotary drive mechanism. Several laser emitters are mounted at the bottom of the slider, and several laser receivers are mounted on the press base corresponding to each laser emitter.

[0006] Each adjustment component of the present invention is located between the lower end of the connecting rod and the upper part of the slider. When the height of the slider needs to be adjusted, the servo motor is equipped with a reducer. The servo motor drives the worm shaft to rotate, the worm wheel and the adjusting nut to rotate, and the relative position of the adjusting screw and the adjusting nut in the height direction changes. The sleeve is fixed to the adjusting nut, and the height of the sleeve is adjusted, so that each sleeve drives the slider to move up and down to adjust the height position. Compared with existing technologies, the advantages of this invention are as follows: It is equipped with a bottom dead center repeatability detection and compensation mechanism. Through induction detection mounted on the slider and press base, a laser emitter emits a laser signal to a laser receiver, measuring the height position of the four corners of the slider. The bottom dead center positioning accuracy is fed back to the control system, which then controls the servo motor and cylinder to perform compensation actions. The compensation method is a dual mechanism of servo motor drive and mechanical compensation. The servo motor drive involves the servo motor driving the worm gear to rotate, and the worm wheel rotation allows for adjustment of the slider's height position via adjusting screws and nuts. The mechanical compensation involves fine-tuning the slider height. A cylinder drives a swing seat to swing, which in turn drives a gear to rotate via a locking pin. This, in turn, causes the connecting shaft to rotate the worm gear at a small angle, and the worm wheel rotates, allowing for fine-tuning of the slider's height position via adjusting screws and nuts. The advantages of this invention are: 1. Self-locking by the servo motor eliminates the gap between the worm gear and worm wheel; 2. High-precision laser sensors detect the actual physical position of the slider and feed it back to the control system, achieving closed-loop control; 3. Based on the feedback signal from the laser sensor, the control system determines whether adjustment and mechanical compensation are needed.

[0007] The bottom dead center position of the slider in this invention is continuously monitored by a laser emitter mounted on the slider. If a deviation greater than a set value occurs, the deviation is corrected before the next molding by fine-tuning the slider position. The height position of the locking mold (slider) is locked using the holding force of a servo motor. When no fine-tuning is required, the slider is locked in a position with no screw gaps. When fine-tuning is needed, it is immediately unlocked. This method is adopted because electrical control has better responsiveness than hydraulic control.

[0008] As a further improvement of the present invention, four connecting rods are provided, with the crankshaft length direction parallel to the slider length direction. Four sets of adjustment components are provided on the slider, and the four sets of adjustment components are symmetrically distributed on the slider in pairs, arranged along the slider length direction.

[0009] As a further improvement of the present invention, the upper part of the adjusting seat is provided with an installation groove, the lower end of the sleeve is provided with a bottom cover, the middle of the bottom cover is provided with a through hole for the adjusting nut to pass through, the lower end of the bottom cover is provided with a positioning sleeve extending downward into the installation groove, the outer periphery of the positioning sleeve corresponds to the inner wall of the installation groove, the inside of the installation sleeve is provided with an annular pad, the pad coincides with the axis of the adjusting screw, the outer diameter of the adjusting screw is smaller than the inner diameter of the pad, the lower end of the adjusting nut is provided with an outer step, the outer step fits into the bottom cover and between the bottom cover and the pad, the upper end of the sleeve is provided with a top cover, the middle of the top cover is provided with a through hole for the adjusting screw to extend out, the inner wall of the through hole corresponds to the outer periphery of the adjusting nut, and the worm gear is located between the top cover and the bottom cover. The servo motor drives the worm to rotate, the worm gear and the adjusting nut rotate, the relative position of the adjusting screw and the adjusting nut in the height direction changes, the sleeve is fixed to the adjusting nut, and the height of the sleeve is adjusted.

[0010] As a further improvement of the present invention, a cylindrical connecting seat is provided on the outer periphery of the upper end of the adjusting screw, and a flange is provided on the outer periphery of the adjusting screw. The flange is fixedly connected to the lower end of the cylindrical connecting seat. A cover plate is provided on the upper end of the cylindrical connecting seat, and a hinge groove one is provided on the lower side of the cover plate. A hinge groove two is provided on the upper end of the adjusting screw. A ball head is provided on the lower end of the connecting rod. The connecting rod passes through the cover plate, and the ball head is hinged to the connecting seat through the first hinge groove and the second hinge groove. The lower end of the connecting rod is hinged to the connecting seat and the cover plate, and the swinging of the connecting rod drives the connecting seat to rise and fall.

[0011] To protect the adjusting screw and prevent dust from contacting it, a dustproof telescopic sleeve is fixed to the upper end of the top cover. The upper end of the dustproof telescopic sleeve is fixed to the press body, and the dustproof telescopic sleeve covers the adjusting screw.

[0012] To drive the worm gear rotation, two sets of rotary drive mechanisms are symmetrically arranged. Each rotary drive mechanism includes two symmetrically arranged servo motors. The worm gears of the adjusting components are arranged along the length of the slider. The opposite ends of the worm gears in the two sets of adjusting components on the left extend out of sleeves, as do the opposite ends of the worm gears in the two sets of adjusting components on the right. A connecting shaft is provided between the two opposite worm gear extension ends, and both ends of the connecting shaft are connected to the two worm gear extension ends via couplings. The other ends of the worm gears in the two inner sleeves extend out of the sleeves and are respectively connected to the two servo motors. The two servo motors drive the worm gears of the two sets of adjusting components on the left and the two sets on the right to rotate, respectively.

[0013] To fine-tune the height of the slider, mounting seats are provided on the outer sides of the sleeves of the two sets of adjustment components located on the inner side. A cylinder is mounted on the mounting seat corresponding to the connecting shaft. A drive rod is hinged to the extended end of the piston rod of the cylinder, and a swing seat is hinged to the other end of the drive rod. A downwardly extending mounting plate is provided on one side of the swing seat. A mounting hole for the connecting shaft to pass through is provided on the mounting plate. A bearing is provided between the inner wall of the mounting hole and the outer circumference of the connecting shaft. The mounting plate is rotatably connected to the connecting shaft. A gear is provided on the connecting shaft below the swing seat. A piston is provided inside the swing seat. Air chambers are provided above and below the piston inside the swing seat. An air inlet and an air outlet are connected to the two air chambers outside the swing seat. A locking pin extending out of the swing seat is connected to the piston. The locking pin is set according to the tooth clearance of the gear. Air presses the piston down, the locking pin inserts into the gear tooth gap, the cylinder drives the swing seat to swing through the drive rod, and pushes the gear to rotate through the locking pin. The connecting shaft drives the worm to rotate at a small angle. The worm wheel rotates, so the height position of the slider can be finely adjusted by adjusting the screw and adjusting nut. Each time the cylinder pushes the swing seat, the slider's height adjustment is about 10μm.

[0014] In order to monitor the height position of the four corners of the slider, four laser emitters and four laser receivers are provided, and the four laser emitters and four laser receivers are located at the four corners of the slider and the press base, respectively. Attached Figure Description

[0015] Figure 1 This is a front view of the invention mounted on the slider and press base.

[0016] Figure 2 This is a top view of the invention mounted on the slider and press base.

[0017] Figure 3 This is a left view of the invention mounted on the slider and press base.

[0018] Figure 4 To adjust the top view of the component.

[0019] Figure 5 for Figure 4 A sectional view along the AA direction.

[0020] Figure 6 A 3D structural diagram of the adjustment components.

[0021] Figure 7 A 3D structural diagram of the adjustment components.

[0022] Figure 8 for Figure 2 Enlarged view of point B in the middle.

[0023] Figure 9 This is the front view of the swing seat.

[0024] Figure 10 This is a side view of the swing seat.

[0025] Figure 11 This is a side view of the swing seat with the locking pin raised.

[0026] Figure 12 This is a side view of the swing seat when the locking pin is lowered.

[0027] Figure 13 This is a side view of the swing seat after the gear is driven to rotate by the locking pin.

[0028] The components include: 1. slider, 2. connecting rod, 2a. ball head, 3. adjusting seat, 3a. mounting groove, 4. sleeve, 4a. bottom cover, 4a1. positioning sleeve, 5. adjusting screw, 5a. flange, 6. adjusting nut, 6a. outer step, 7. worm gear, 8. worm, 9. laser emitter, 10. laser receiver, 11. through hole one, 12. pad, 13. top cover, 14. through hole two, 15. connecting seat, 16. cover plate, 17. hinge groove one, 18. hinge groove two, 19. dustproof telescopic sleeve, 20. servo motor, 21. connecting shaft, 22. coupling, 23. mounting seat, 24. cylinder, 25. drive rod, 26. swing seat, 26a. mounting plate, 27. bearing, 28. gear, 29. piston, 30. air chamber, 31. locking pin, 32. crankshaft, and 33. press base. Detailed Implementation

[0029] like Figure 1-13As shown, a high-precision bottom dead center repeatability compensation device includes a slider 1 mounted on a press. A crankshaft 32 is rotatably mounted on the press above the slider 1. The crankshaft 32 consists of two half-shafts connected by a coupling. The crankshaft 32 has several axially spaced connecting rod journals, each hinged to a connecting rod 2. The slider 1 has several sets of adjustment components, each corresponding to one of the connecting rods 2. There are four connecting rods 2. The length direction of the crankshaft 32 is parallel to the length direction of the slider 1. The slider 1 has four sets of adjustment components, symmetrically distributed in pairs on the slider 1. The four sets of adjustment components move along the slider... The blocks 1 are arranged along their length. The adjustment assembly includes an adjustment seat 3 fixed on the slider 1, a sleeve 4 vertically mounted on the adjustment seat 3, an adjustment screw 5 vertically mounted inside the sleeve 4, the upper end of the adjustment screw 5 extending upward out of the sleeve 4, an adjustment nut 6 threadedly connected to the outer circumference of the portion of the adjustment screw 5 inside the sleeve 4, a worm gear 7 fixedly mounted on the outer circumference of the adjustment nut 6, and a worm 8 rotatably mounted inside the sleeve 4, meshing with the worm gear 7. The ends of each worm 8 extend out of the sleeve 4 and are connected to the rotary drive mechanism. Several laser emitters 9 are mounted at the bottom of the slider 1, and several laser receivers 10 are mounted on the press base 33 corresponding to each laser emitter 9. To monitor the height position of all four corners of the slider 1, four laser emitters 9 and four laser receivers 10 are provided, located at the four corners of the slider 1 and the press base 33, respectively.

[0030] The upper part of the adjusting seat 3 has an installation groove 3a, and the lower end of the sleeve 4 has a bottom cover 4a. The middle part of the bottom cover 4a has a through hole 11 that can accommodate the adjusting nut 6. The lower end of the bottom cover 4a has a positioning sleeve 4a1 that extends downward into the installation groove 3a. The outer circumference of the positioning sleeve 4a1 corresponds to the inner wall of the installation groove 3a. The inside of the mounting sleeve has an annular pad 12. The pad 12 coincides with the axis of the adjusting screw 5. The outer diameter of the adjusting screw 5 is smaller than the inner diameter of the pad 12. The lower end of the adjusting nut 6 has an outer step 6a. The outer step 6a fits between the bottom cover 4a and the pad 12. The upper end of the sleeve 4 has a top cover 13. The middle part of the top cover 13 has a through hole 14 that can accommodate the adjusting screw 5. The inner wall of the through hole 14 corresponds to the outer circumference of the adjusting nut 6. The worm gear 7 is located between the top cover 13 and the bottom cover 4a. Servo motor 20 drives worm gear 8 to rotate, worm wheel 7 and adjusting nut 6 to rotate, changing the relative position of adjusting screw 5 and adjusting nut 6 in the height direction. Sleeve 4 is fixed to adjusting nut 6, adjusting the height of sleeve 4. A cylindrical connecting seat 15 is provided on the outer periphery of the upper end of adjusting screw 5, and a flange 5a is provided on the outer periphery of adjusting screw 5. Flange 5a is fixedly connected to the lower end of cylindrical connecting seat 15. A cover plate 16 is provided on the upper end of cylindrical connecting seat 15, with a hinge groove 17 on the lower side of cover plate 16. A second hinge groove 18 is provided on the upper end of adjusting screw 5. A ball head 2a is provided on the lower end of connecting rod 2. Connecting rod 2 passes through cover plate 16, and ball head 2a is hinged to connecting seat 15 through hinge groove 17 and hinge groove 18. The lower end of connecting rod 2 is hinged to connecting seat 15 and cover plate 16, and the swinging of connecting rod 2 drives connecting seat 15 to rise and fall.

[0031] In order to protect the adjusting screw 5 and prevent dust from contacting it, a dustproof telescopic sleeve 19 is fixed to the upper end of the top cover 13. The upper end of the dustproof telescopic sleeve 19 is fixed to the fixed sleeve on the press body. The connecting seat 15 is located inside the fixed sleeve, and the dustproof telescopic sleeve 19 covers the adjusting screw 5.

[0032] To drive the worm gear 8 to rotate, two sets of rotary drive mechanisms are symmetrically arranged on the left and right sides. Each rotary drive mechanism includes two symmetrically arranged servo motors 20. The worm gear 8 of the adjusting components is arranged along the length of the slider 1. The opposite ends of the worm gear 8 in the two sets of adjusting components on the left extend out of the sleeves 4, and the opposite ends of the worm gear 8 in the two sets of adjusting components on the right also extend out of the sleeves 4. A connecting shaft 21 is provided between the extended ends of the two opposite worm gear 8. Both ends of the connecting shaft 21 are connected to the extended ends of the two worm gear 8 via a coupling 22. The other ends of the worm gear 8 in the two inner sleeves 4 extend out of the sleeves 4 and are respectively connected to the two servo motors 20. The two servo motors 20 drive the worm gear 8 of the two sets of adjusting components on the left and the two sets of adjusting components on the right to rotate, respectively.

[0033] To fine-tune the height of slider 1, mounting seats 23 are provided on the outer side of the sleeves 4 of the two sets of adjustment components located on the inner side. A cylinder 24 is mounted on the mounting seat 23 corresponding to the connecting shaft 21. The piston 29 rod of the cylinder 24 is hinged to a drive rod 25 at its extended end. The other end of the drive rod 25 is hinged to a swing seat 26. A downwardly extending mounting plate 26a is provided on one side of the swing seat 26. A mounting hole for the connecting shaft 21 to pass through is provided on the mounting plate 26a. A bearing 27 is provided between the inner wall of the mounting hole and the outer periphery of the connecting shaft 21. The mounting plate 26a is rotatably connected to the connecting shaft 21. A gear 28 is provided on the connecting shaft 21 below the swing seat 26. A piston 29 is provided inside the swing seat 26. Air chambers 30 are provided above and below the piston 29 inside the swing seat 26. An air inlet and an air outlet are connected to the two air chambers 30 on the outside of the swing seat 26. A locking pin 31 extending out of the swing seat 26 is connected to the piston 29. The locking pin 31 is set with the tooth gap corresponding to the gear 28. Air presses down piston 29, locking pin 31 inserts into the tooth gap of gear 28, cylinder 24 drives swing seat 26 to swing through drive rod 25, and pushes gear 28 to rotate through locking pin 31. Connecting shaft 21 drives worm 8 to rotate at a small angle, worm wheel 7 rotates, so that the height position of slider 1 can be finely adjusted by adjusting screw 5 and adjusting nut 6. Each time cylinder 24 pushes swing seat 26, the lifting adjustment of slider 1 is about 10μm.

[0034] Each adjustment component of the present invention is disposed between the lower end of the connecting rod 2 and the upper part of the slider 1. When the height of the slider 1 needs to be adjusted, the servo motor 20 is equipped with a reducer, which drives the worm gear 8 shaft to rotate, the worm wheel 7 and the adjusting nut 6 to rotate, and the relative position of the adjusting screw 5 and the adjusting nut 6 in the height direction changes. The sleeve 4 is fixed to the adjusting nut 6, and the height of the sleeve 4 is adjusted, so that each sleeve 4 drives the slider 1 to move up and down to adjust the height position. The advantages of this invention are as follows: It is equipped with a bottom dead center repeatable positioning detection and compensation mechanism. Through the sensing detection installed on the slider 1 and the press base 33, the laser emitter 9 emits a laser signal to the laser receiver 10 to measure the height position of the four corners of the slider 1. The bottom dead center positioning accuracy is fed back to the control system, and the control system controls the servo motor 20 and the cylinder 24 to perform compensation actions. The compensation method is a dual mechanism of servo motor 20 drive and mechanical compensation. The servo motor 20 drive is to drive the worm 8 to rotate, and the worm wheel 7 rotates to adjust the height position of the slider 1 by adjusting the screw 5 and the adjusting nut 6. The mechanical compensation is to fine adjust the height of the slider 1. The cylinder 24 drives the swing seat 26 to swing, and the locking pin 31 pushes the gear 28 to rotate. The connecting shaft 21 drives the worm 8 to rotate at a small angle, and the worm wheel 7 rotates to fine adjust the height position of the slider 1 by adjusting the screw 5 and the adjusting nut 6.

[0035] The bottom dead center position of the slider 1 in this invention is continuously monitored by a laser emitter 9 mounted on the slider 1. If a deviation greater than a set value occurs, the deviation is corrected before the next molding by fine-tuning the position of the slider 1. The height position of the locking mold (slider 1) is locked using the holding force of the servo motor 20. When no fine-tuning is required, the slider 1 is locked in a position with no screw clearance. When fine-tuning is needed, it is immediately unlocked. This method is adopted because electrical control has better responsiveness than hydraulic control. The advantages of this invention are: 1. The servo motor self-locking eliminates the clearance between the worm gear and the worm; 2. A high-precision laser sensor detects the actual physical position of the slider and feeds it back to the control system, realizing closed-loop control; 3. Based on the feedback signal from the laser sensor, the control system decides whether adjustment and mechanical compensation are needed.

[0036] This invention is not limited to the above embodiments. Based on the technical solutions disclosed in this invention, those skilled in the art can make some substitutions and modifications to some of the technical features without creative effort, and all such substitutions and modifications are within the protection scope of this invention.

Claims

1. A high-precision bottom dead center repeat position accuracy compensation device, comprising a slide mounted on a press, a crankshaft rotatably arranged above the slide on the press, a plurality of axially spaced connecting rod journals provided on the crankshaft, and a connecting rod hingedly connected to each connecting rod journal, characterized in that, The slider is equipped with several sets of adjustment components, each corresponding to a connecting rod. Each adjustment component includes an adjustment seat fixed to the slider, a sleeve vertically mounted on the adjustment seat, and an adjustment screw vertically mounted inside the sleeve. The upper end of the adjustment screw extends upwards out of the sleeve, and an adjustment nut is threadedly connected to the outer circumference of the portion of the adjustment screw inside the sleeve. A worm gear is fixedly fitted around the outer circumference of the adjustment nut. A worm gear, meshing with the worm gear, is rotatably mounted inside the sleeve. The ends of each worm gear extend out of the sleeve and are connected to a rotary drive mechanism. Several laser emitters are located at the bottom of the slider. The press base is equipped with several laser receivers corresponding to each laser emitter; four connecting rods are provided, with the crankshaft length direction parallel to the slider length direction. Four sets of adjustment components are provided on the slider, symmetrically distributed in pairs along the slider length direction; two sets of rotary drive mechanisms are symmetrically arranged, each including two symmetrical servo motors. The worm gears of the adjustment components are arranged along the slider length direction. The opposite ends of the worm gears of the two left-hand adjustment components extend out of sleeves, while the two right-hand adjustment components... The worm gears of the components each extend out of a sleeve at opposite ends. A connecting shaft is provided between the two opposite worm gear extensions, and both ends of the connecting shaft are connected to the two worm gear extensions via couplings. The other ends of the worm gears of the two inner sleeves extend out of the sleeves and are respectively connected to two servo motors. Mounting seats are provided on the outer sides of the sleeves of the two inner sets of the adjustment components. Cylinders are mounted on the mounting seats corresponding to the connecting shafts. A drive rod is hinged to the piston rod extension of the cylinder, and a swing seat is hinged to the other end of the drive rod. A downwardly extending mounting plate is provided on one side of the swing seat, and the mounting plate has openings for... The connecting shaft passes through a mounting hole, and a bearing is provided between the inner wall of the mounting hole and the outer circumference of the connecting shaft. The mounting plate is rotatably connected to the connecting shaft. A gear is provided on the connecting shaft below the swing seat. A piston is provided inside the swing seat. Air chambers are provided above and below the piston inside the swing seat. An air inlet and an air outlet are connected to the two air chambers on the outside of the swing seat. A locking pin is connected to the piston and extends out of the swing seat. The locking pin is set with the tooth gap corresponding to the gear. There are four laser emitters and four laser receivers. The four laser emitters and four laser receivers are located at the four corners of the slider and the press base, respectively.

2. A high precision bottom dead center repeat position accuracy compensation device as defined in claim 1, characterized in that, The upper part of the adjusting seat has an installation groove, and the lower end of the sleeve has a bottom cover. The bottom cover has a through hole in the middle that allows the adjusting nut to pass through. The lower end of the bottom cover has a positioning sleeve that extends downward into the installation groove. The outer circumference of the positioning sleeve corresponds to the inner wall of the installation groove. The installation sleeve has an annular pad inside. The pad coincides with the axis of the adjusting screw. The outer diameter of the adjusting screw is smaller than the inner diameter of the pad. The lower end of the adjusting nut has an outer step that fits between the bottom cover and the pad. The upper end of the sleeve has a top cover. The middle of the top cover has a through hole that allows the adjusting screw to extend out. The inner wall of the through hole corresponds to the outer circumference of the adjusting nut. The worm gear is located between the top cover and the bottom cover.

3. The high-precision bottom dead center repeatability position accuracy compensation device according to claim 2, characterized in that, The upper end of the adjusting screw is provided with a cylindrical connecting seat, and the outer periphery of the adjusting screw is provided with a flange. The flange is fixedly connected to the lower end of the cylindrical connecting seat. The upper end of the cylindrical connecting seat is provided with a cover plate. A hinge groove one is opened on the lower side of the cover plate. A hinge groove two is opened on the upper end of the adjusting screw. A ball head is provided at the lower end of the connecting rod. The connecting rod passes through the cover plate and the ball head is hinged to the connecting seat through the hinge groove one and the hinge groove two.

4. A high-precision bottom dead center repeatability position accuracy compensation device according to claim 3, characterized in that, A dustproof telescopic sleeve is fixed to the upper end of the top cover. The upper end of the dustproof telescopic sleeve is fixed to the press body, and the dustproof telescopic sleeve covers the adjusting screw.

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