A gantry grinder clamping structure and method

Abstract

The present invention discloses a clamping structure and method for a gantry grinder, aiming to solve the problems of poor clamping reliability and difficult control of clamping position when multiple racks are clamped and ground at the same time. The invention comprises a base mounted on the gantry grinder, a clamping seat mounted on the base, a fixed clamping strip and a plurality of piston cylinders are arranged on the clamping seat, a telescopic rod of the piston cylinder is connected to a push rod, the push rod and the fixed clamping strip are arranged oppositely, and a clamping gap for clamping a workpiece is formed between the push rod and the fixed clamping strip. The clamping is reliable during the rack grinding process, and the clamping position is accurate and reliable when multiple racks are clamped and ground at the same time.

Description

Technical Field

[0001] The invention relates to a grinding machine equipment, and more particularly to a gantry grinding machine clamping structure and method. Background Art

[0002] At present, in the process of mechanical processing, it is often necessary to use a grinder to grind the surface of the workpiece to improve the smoothness of the workpiece surface and the dimensional accuracy of the workpiece. The workpiece needs to be clamped during the grinding process. The commonly used clamping method is to use a clamping jaw to clamp and position the workpiece. This clamping method has poor reliability. In addition, many times, it is necessary to clamp multiple workpieces at the same time for one grinding. For example, when grinding a rack, clamping multiple racks side by side and grinding them at the same time can improve work efficiency. However, it is difficult to control the clamping position when clamping multiple workpieces at the same time. Summary of the invention

[0003] In order to overcome the above-mentioned shortcomings, the present invention provides a gantry grinder clamping structure and method, which can ensure reliable clamping during rack grinding and accurate and reliable clamping positions when multiple racks are clamped and ground simultaneously.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: a gantry grinder clamping structure, including a base installed on the gantry grinder, a clamping seat installed on the base, a fixed clamping strip and a plurality of piston cylinders are arranged on the clamping seat, the piston cylinder telescopic rod is connected to the push rod, the push rod and the fixed clamping strip are arranged opposite to each other, and a clamping gap for clamping a workpiece is formed between the push rod and the fixed clamping strip.

[0005] When the rack is being ground, it is clamped in a clamping seat. First, the rack is loaded into the clamping gap, and then the piston cylinder is started. The telescopic rod of the piston cylinder extends outward to push the push rod to move, so that the rack is clamped between the push rod and the fixed clamp strip, and the clamping is reliable. When clamping multiple racks for grinding, multiple racks are placed side by side on the clamping seat, and two adjacent racks are close together. Finally, the push rod is pressed against the rack to position all racks. The fixed clamp strip is long and has a long clamping range, so that the clamping position of the rack is accurate and reliable. When the rack is clamped, one side is close to the position, and when the push rod is pressed, the rack will hardly move in the width direction, so the clamping position is more accurate and reliable.

[0006] Preferably, an electromagnet for adsorbing the workpiece is installed in the clamping seat.

[0007] The rack is clamped in place, and the electromagnet is energized to generate magnetism to attract and position the rack before the push rod abuts against it, preventing the rack from moving.

[0008] Preferably, a positioning strip is provided on the clamping seat, a plurality of positioning grooves are provided on the positioning strip corresponding to the ejector rod, and the ejector rod is movably inserted into the positioning grooves.

[0009] The positioning groove plays a good role in positioning the ejector rod, preventing the ejector rod from deviating during movement.

[0010] Preferably, a clamping convex strip for loading the workpiece is provided on the clamping seat, and a side wall of the fixed clamping strip is in contact with a side wall of the clamping convex strip.

[0011] The arrangement of the clamping convex strip makes the connection between the fixed clamping strip and the clamping seat more accurate and reliable.

[0012] Preferably, the push rod is connected to a limit head, which is placed between the clamping convex strip and the piston cylinder, and the lower end of the limit head is lower than the upper surface of the clamping convex strip. The limit head limits the extension distance of the push rod to prevent the push rod from extending too far.

[0013] Preferably, a turntable driven by a motor is rotatably mounted on the base, and the clamping seat is tightly connected to the turntable. The clamping seat is tightly connected to the turntable to facilitate adjustment of the inclination angle of the clamping seat. When the clamped rack is a helical rack, and when the grinder is working, the moving direction is forward, backward, left, right, up, and down, and the direction of the helical teeth is inclined. It is inconvenient to move the inclined teeth during the grinding process. By rotating the turntable, the inclination angle of the clamping seat is adjusted so that the length direction of the helical teeth of the rack is set forward and backward, which is convenient for the forward and backward movement of the helical teeth grinding operation.

[0014] Preferably, the base is provided with arc-shaped guide grooves corresponding to the two ends of the clamping seat, and the clamping seat is provided with guide pillars corresponding to the guide grooves, and the guide pillars are plug-fitted and connected with the guide grooves. The arrangement of the guide grooves and guide pillars makes the rotation process of the clamping seat more stable and reliable.

[0015] Preferably, a circle of meshing teeth is provided at the edge of the turntable, a movably arranged locking column is installed on the base, and a locking tooth is provided at the end of the locking column, and the locking tooth is adapted to mesh with the meshing teeth.

[0016] During the rotation of the turntable, the locking column moves backward to separate the locking teeth from the meshing teeth. After the turntable rotates to the right position, the locking column moves forward to make the locking teeth fit and mesh with the meshing teeth to achieve the locking and positioning of the turntable.

[0017] Preferably, a rack is clamped in the clamping gap, a clamping auxiliary rod is installed on the base, one end of the clamping auxiliary rod is hinged on the base, and the other end of the clamping auxiliary rod is provided with a limit hole, a limit pin and a mounting cylinder are installed on the base corresponding to the limit hole, the limit pin and the mounting cylinder are adapted to be matched, a pre-tensioning spring is installed in the mounting cylinder, the pre-tensioning spring abuts on the limit pin, and a positioning slide groove is provided on the clamping auxiliary rod; the clamping auxiliary rod is rotated to make the end of the limit pin inserted in the limit hole to limit the clamping auxiliary rod, at this time, the length direction of the positioning slide groove is parallel to the length direction of the tooth groove on the rack; a number of sliders are installed in the positioning slide groove, the slider connects the guide rod extending downward and the connecting rod extending upward, the lower end of the guide rod is connected to the positioning guide block adapted to the tooth groove on the rack, a positioning seat and a positioning spring are installed on the connecting rod, the positioning spring abuts on the positioning seat, and the positioning seat rises upward and rotates and abuts on the upper surface of the clamping auxiliary rod to position the slider.

[0018] When clamping the helical rack, load the rack with the helical teeth facing upward into the clamping gap, the side wall of the first rack leans against the side wall of the fixed clamping bar, and then push the slider to move in the positioning slot, so that the first positioning guide block is adapted to be inserted into the tooth groove on the first rack, and the positioning seat corresponding to the first positioning guide block is raised upward and rotated to abut against the upper surface of the clamping auxiliary rod to position the slider; then load the second rack into the clamping gap, the second rack is side by side with the first rack, and push the slider to move in the positioning slot, so that the second positioning guide block The block is adapted to be inserted into the tooth groove on the second rack, the positioning seat corresponding to the second positioning guide block is lifted up and rotated, and then abutted against the upper surface of the clamping auxiliary rod to position the slider; in this way, the Nth rack is loaded into the clamping gap, the Nth rack is placed side by side next to the (N-1)th rack, and the slider is pushed to move in the positioning groove, so that the Nth positioning guide block is adapted to be inserted into the tooth groove on the Nth rack, the positioning seat corresponding to the Nth positioning guide block is lifted up and rotated, and then abutted against the upper surface of the clamping auxiliary rod to position the slider.

[0019] The slider slides in the positioning slot, so all the positioning guide blocks are on the same line. The positioning guide blocks are inserted into the tooth grooves to align the tooth grooves of all racks, which is convenient for synchronous grinding. This structural setting can achieve precise positioning when multiple racks are clamped and ground at the same time.

[0020] A gantry grinder clamping method, using a gantry grinder clamping structure to clamp a helical rack workpiece that needs to be ground, includes the following steps:

[0021] S1, rotating the turntable according to the inclination angle of the rack bevel teeth, so that the clamping seat is in an inclined state, and the inclination angle of the clamping seat is the same as the inclination angle of the bevel teeth;

[0022] S2, rotating the clamping auxiliary rod so that the end of the limit pin is inserted into the limit hole to limit the clamping auxiliary rod. At this time, the positioning slot on the clamping auxiliary rod is arranged longitudinally in the front and back direction;

[0023] S3, load the rack with the helical teeth facing upward into the clamping gap, the side wall of the first rack leans against the side wall of the fixed clamping bar, and then push the slider to move in the positioning slot, so that the first positioning guide block fits into the tooth groove on the first rack, and the positioning seat corresponding to the first positioning guide block is raised and rotated to abut against the upper surface of the clamping auxiliary rod to position the slider; then load the second rack into the clamping gap, the second rack is placed side by side with the first rack, and push the slider to move in the positioning slot, so that the second positioning guide block fits into the tooth groove on the first rack. The first rack is inserted into the tooth groove on the second rack, the positioning seat corresponding to the second positioning guide block is lifted up and rotated, and then abutted against the upper surface of the clamping auxiliary rod to position the slider; in this way, the Nth rack is loaded into the clamping gap, the Nth rack is arranged side by side next to the (N-1)th rack, and the slider is pushed to move in the positioning slot, so that the Nth positioning guide block is inserted into the tooth groove on the Nth rack, the positioning seat corresponding to the Nth positioning guide block is lifted up and rotated, and then abutted against the upper surface of the clamping auxiliary rod to position the slider;

[0024] S4, the telescopic rod of the piston cylinder extends outward, so that the end of the push rod presses against the outermost rack, so that all the racks are clamped between the push rod and the fixed clamping bar. At this time, the tooth grooves of all the racks are aligned to form a long tooth groove, and the long tooth groove is parallel to the positioning groove on the clamping auxiliary rod;

[0025] S5, the positioning seat is lifted up and rotated, and then the positioning seat is released, so that the positioning seat abuts against the slider, the positioning seat loses the limit of the slider, and the slider is moved to make the positioning guide block slide away from the long tooth groove;

[0026] S6, pull out the limit pin from the limit hole, rotate the clamping auxiliary rod, and make the clamping auxiliary rod and the clamping seat staggered.

[0027] The rack is clamped reliably during the grinding process, and the clamping position is accurate and reliable when multiple racks are clamped and ground simultaneously.

[0028] Compared with the prior art, the beneficial effects of the present invention are: reliable clamping during the rack grinding process, and accurate and reliable clamping positions when multiple racks are clamped and ground simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the use state of the present invention;

[0030] Figure 2 It is a structural schematic diagram of the clamping seat of the present invention;

[0031] Figure 3 is a top view of the present invention;

[0032] Figure 4 It is a partial enlarged schematic diagram of the connection between the limit pin and the limit hole of the present invention;

[0033] Figure 5 It is a partial structural schematic diagram of the connection between the slider and the positioning slide groove of the present invention;

[0034] In the figure: 1, gantry grinder, 2, base, 3, clamping seat, 4, grinding head, 5, slide seat, 6, fixed clamping strip, 7, piston cylinder, 8, push rod, 9, positioning strip, 10, positioning groove, 11, clamping convex strip, 12, limit head, 13, turntable, 14, guide groove, 15, guide column, 16, meshing teeth, 17, locking column, 18, locking teeth, 19, connecting seat, 20, locking screw, 21, anti-rotation groove, 22, installation groove, 2 3. convex ring, 24. positioning ring, 25. rack, 26. clamping auxiliary rod, 27. limiting hole, 28. limiting pin, 29. mounting tube, 30. preload spring, 31. lever, 32. avoidance groove, 33. positioning slide groove, 34. slider, 35. guide rod, 36. connecting rod, 37. positioning guide block, 38. positioning seat, 39. positioning spring, 40. spring seat, 41. upper through groove, 42. lower through groove, 43. stop column. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0036] Embodiment: A gantry grinder clamping structure (see attached Figure 1 To Attachment Figure 5 ), including a base 2 mounted on a gantry grinder 1, a clamping seat 3 mounted on the base, the base is mounted on the gantry grinder and can move forward and backward, a grinding head 4 that can be raised and lowered is mounted on the base, a sliding seat 5 that can move laterally is mounted on the gantry grinder, and the grinding head is mounted on the sliding seat. A fixed clamping strip 6 and a plurality of piston cylinders 7 are arranged on the clamping seat, and a piston cylinder telescopic rod is connected to a push rod 8, the push rod and the fixed clamping strip are arranged oppositely, and a clamping gap for clamping a workpiece is formed between the push rod and the fixed clamping strip. An electromagnet for adsorbing the workpiece is installed in the clamping seat.

[0037] A positioning bar 9 is provided on the clamping seat, and a plurality of positioning grooves 10 are provided on the positioning bar corresponding to the push rod, and the push rod and the positioning groove are movably inserted together. The positioning bar is arranged in parallel with the fixed clamping bar. A clamping convex strip 11 for loading the workpiece is provided on the clamping seat, and a side wall of the fixed clamping strip is fitted with a side wall of the clamping convex strip. A limit head 12 is connected to the push rod, and the limit head is placed between the clamping convex strip and the piston cylinder, and the lower end of the limit head is lower than the upper surface of the clamping convex strip.

[0038] A turntable 13 driven by a motor is rotatably mounted on the base, and the clamping seat is tightly connected to the turntable. A mounting hole is provided on the base, and a boss is provided on the lower surface of the turntable. The boss is fitted together with the mounting hole. The turntable is supported on the base, and the motor output shaft is connected to the boss. The base is provided with arc-shaped guide grooves 14 corresponding to both ends of the clamping seat, and the clamping seat is provided with guide columns 15 corresponding to the guide grooves. The guide columns are fitted and connected with the guide grooves. A fastening nut is connected to the guide column, and the fastening nut abuts against the base.

[0039] A circle of meshing teeth 16 is provided on the edge of the turntable, and a movable locking column 17 is installed on the base. A locking tooth 18 is provided at the end of the locking column, and the locking tooth is adapted to mesh with the meshing teeth. A connecting seat 19 is provided on the base corresponding to the locking column, and a locking screw 20 is threadedly connected to the connecting seat. The locking screw and the locking column are rotatably connected together. An anti-rotation groove 21 is provided on the connecting seat, and the locking column is adapted to be inserted into the anti-rotation groove. The locking column can move axially but cannot rotate circumferentially. An installation groove 22 is provided at the end of the locking column, and a convex ring 23 is provided at one end of the locking screw. A bearing is installed between the convex ring and the installation groove. A positioning ring 24 for limiting the convex ring is connected to the end face of the locking column, and balls are installed on the bottom surface of the installation groove and the end face of the positioning ring.

[0040] A rack 25 is clamped in the clamping gap, a clamping auxiliary rod 26 is installed on the base, one end of the clamping auxiliary rod is hinged on the base, and a limiting hole 27 is provided at the other end of the clamping auxiliary rod. A limiting pin 28 and a mounting tube 29 are installed on the base corresponding to the limiting hole. The limiting pin and the mounting tube are adapted to be assembled, a preload spring 30 is installed in the mounting tube, the preload spring abuts against the limiting pin, a lever 31 is connected to the side wall of the limiting pin, an avoidance groove 32 is provided on the mounting tube, the lever passes through the avoidance groove, the end of the limiting pin is in a conical structure, and a positioning slide groove 33 is provided on the clamping auxiliary rod; the clamping auxiliary rod is rotated so that the end of the limiting pin is inserted in the limiting hole to limit the clamping auxiliary rod. At this time, the positioning slide groove is long The degree direction is parallel to the length direction of the tooth groove on the rack; a plurality of sliders 34 are installed in the positioning slide groove, and the slider can move along the positioning slide groove but cannot rotate in the positioning slide groove. The slider is connected to the guide rod 35 extending downward and the connecting rod 36 extending upward. The lower end of the guide rod is connected to the positioning guide block 37 adapted to the tooth groove on the rack. Both ends of the positioning guide block are V-shaped structures for easy insertion into the tooth groove. A positioning seat 38 and a positioning spring 39 are mounted on the connecting rod. The lower end of the positioning spring abuts on the positioning seat. The upper end of the connecting rod is connected to the spring seat 40. The upper end of the positioning spring abuts on the spring seat. The positioning seat rises upward and rotates to abut on the upper surface of the clamping auxiliary rod to position the slider. An upper through groove 41 and a lower through groove 42 that penetrate the positioning slide groove are respectively provided on the upper and lower surfaces of the clamping auxiliary rod. The wide side of the positioning seat is adapted to the width of the upper through groove, and the long side of the positioning seat is larger than the wide side of the upper through groove. The guide rod passes through the lower through groove.

[0041] A stop post 43 is provided on the base near the limit pin. After the auxiliary clamping rod is rotated to the right position, it just rests on the stop post. Therefore, the stop post plays a good positioning role for the auxiliary clamping rod to prevent the auxiliary clamping rod from rotating too far. A spring pin is installed on the base. After the auxiliary clamping rod rotates and staggers with the clamping seat, the spring pin springs into the lower through slot to realize the positioning of the auxiliary clamping rod.

[0042] A gantry grinder clamping method, using a gantry grinder clamping structure to clamp a helical rack workpiece that needs to be ground, includes the following steps:

[0043] S1, rotating the turntable according to the inclination angle of the rack bevel teeth, so that the clamping seat is in an inclined state, and the inclination angle of the clamping seat is the same as the inclination angle of the bevel teeth;

[0044] S2, rotating the clamping auxiliary rod so that the end of the limit pin is inserted into the limit hole to limit the clamping auxiliary rod. At this time, the positioning slot on the clamping auxiliary rod is arranged longitudinally in the front and back direction;

[0045] S3, load the rack with the helical teeth facing upward into the clamping gap, the side wall of the first rack leans against the side wall of the fixed clamping bar, and then push the slider to move in the positioning slot, so that the first positioning guide block fits into the tooth groove on the first rack, and the positioning seat corresponding to the first positioning guide block is raised and rotated to abut against the upper surface of the clamping auxiliary rod to position the slider; then load the second rack into the clamping gap, the second rack is placed side by side with the first rack, and push the slider to move in the positioning slot, so that the second positioning guide block fits into the tooth groove on the first rack. The first rack is inserted into the tooth groove on the second rack, the positioning seat corresponding to the second positioning guide block is lifted up and rotated, and then abutted against the upper surface of the clamping auxiliary rod to position the slider; in this way, the Nth rack is loaded into the clamping gap, the Nth rack is arranged side by side next to the (N-1)th rack, and the slider is pushed to move in the positioning slot, so that the Nth positioning guide block is inserted into the tooth groove on the Nth rack, the positioning seat corresponding to the Nth positioning guide block is lifted up and rotated, and then abutted against the upper surface of the clamping auxiliary rod to position the slider;

[0046] S4, the telescopic rod of the piston cylinder extends outward, so that the end of the push rod presses against the outermost rack, so that all the racks are clamped between the push rod and the fixed clamping bar. At this time, the tooth grooves of all the racks are aligned to form a long tooth groove, and the long tooth groove is parallel to the positioning groove on the clamping auxiliary rod;

[0047] S5, the positioning seat is lifted up and rotated, and then the positioning seat is released, so that the positioning seat abuts against the slider, the positioning seat loses the limit of the slider, and the slider is moved to make the positioning guide block slide away from the long tooth groove;

[0048] S6, pull out the limit pin from the limit hole, rotate the clamping auxiliary rod, and make the clamping auxiliary rod and the clamping seat staggered.

[0049] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A gantry grinder clamping structure, characterized in that: The invention comprises a base mounted on the gantry grinder, a clamping seat mounted on the base, a fixed clamping strip and a plurality of piston cylinders are arranged on the clamping seat, a telescopic rod of the piston cylinder is connected to a push rod, the push rod and the fixed clamping strip are arranged opposite to each other, and a clamping gap for clamping a workpiece is formed between the push rod and the fixed clamping strip; a turntable driven by a motor is rotatably mounted on the base, and the clamping seat is tightly connected to the turntable; a rack is clamped in the clamping gap, a clamping auxiliary rod is mounted on the base, one end of the clamping auxiliary rod is hinged on the base, the length direction of the positioning slide groove is parallel to the length direction of the tooth groove on the rack, and the clamping auxiliary rod is hinged on the base, and the length direction of the positioning slide groove is parallel to the length direction of the tooth groove on the rack. The auxiliary rod is provided with a positioning slide groove; a plurality of sliders are installed in the positioning slide groove, the sliders are connected to the guide rod extending downward and the connecting rod extending upward, and the lower end of the guide rod is connected to the positioning guide block adapted to the tooth groove on the rack; a positioning seat and a positioning spring are mounted on the connecting rod, and the positioning spring abuts against the positioning seat, and an upper through groove that passes through the positioning slide groove is provided on the upper surface of the clamping auxiliary rod, the wide side of the positioning seat is adapted to the width of the upper through groove, and the long side of the positioning seat is larger than the wide side of the upper through groove, and the positioning seat rises upward and rotates and abuts against the upper surface of the clamping auxiliary rod to position the slider.

2. The gantry grinder clamping structure according to claim 1 is characterized in that: An electromagnet for adsorbing the workpiece is installed in the clamping seat.

3. The gantry grinder clamping structure according to claim 1 is characterized in that: A positioning bar is arranged on the clamping seat, a plurality of positioning grooves are arranged on the positioning bar corresponding to the ejector rod, and the ejector rod and the positioning grooves are movably inserted together.

4. A gantry grinder clamping structure according to claim 1, 2 or 3, characterized in that: A clamping convex strip for loading the workpiece is arranged on the clamping seat, and a side wall of the fixed clamping strip is fitted with a side wall of the clamping convex strip.

5. The gantry grinder clamping structure according to claim 4 is characterized in that: The push rod is connected with a limit head, which is arranged between the clamping convex strip and the piston cylinder, and the lower end of the limit head is lower than the upper surface of the clamping convex strip.

6. The gantry grinder clamping structure according to claim 1 is characterized in that: The base is provided with arc-shaped guide grooves corresponding to the two ends of the clamping seat, and the clamping seat is provided with guide pillars corresponding to the guide grooves, and the guide pillars are adapted to be plug-in connected with the guide grooves.

7. The gantry grinder clamping structure according to claim 1 is characterized in that: A circle of meshing teeth is arranged on the edge of the turntable, a movably arranged locking column is installed on the base, and a locking tooth is arranged on the end of the locking column, and the locking tooth is adapted to mesh with the meshing teeth.

8. The gantry grinder clamping structure according to claim 1 is characterized in that: A limit hole is provided at the other end of the clamping auxiliary rod. A limit pin and a mounting cylinder are installed on the base corresponding to the limit hole. The limit pin and the mounting cylinder are adapted to be assembled. A preload spring is installed in the mounting cylinder. The preload spring abuts against the limit pin. The clamping auxiliary rod is rotated so that the end of the limit pin is inserted into the limit hole to limit the clamping auxiliary rod.

9. A gantry grinder clamping method, characterized in that: The gantry grinder clamping structure of claim 8 is used to clamp a helical rack workpiece that needs to be ground, comprising the following steps: S1, rotating the turntable according to the inclination angle of the rack bevel teeth, so that the clamping seat is in an inclined state, and the inclination angle of the clamping seat is the same as the inclination angle of the bevel teeth; S2, rotating the clamping auxiliary rod so that the end of the limit pin is inserted into the limit hole to limit the clamping auxiliary rod. At this time, the positioning slot on the clamping auxiliary rod is arranged longitudinally in the front and back direction; S3, load the rack with the helical teeth facing upward into the clamping gap, the side wall of the first rack leans against the side wall of the fixed clamping bar, and then push the slider to move in the positioning slot, so that the first positioning guide block fits into the tooth groove on the first rack, and the positioning seat corresponding to the first positioning guide block is raised and rotated to abut against the upper surface of the clamping auxiliary rod to position the slider; then load the second rack into the clamping gap, the second rack is placed side by side with the first rack, and push the slider to move in the positioning slot, so that the second positioning guide block fits into the tooth groove on the first rack. The first rack is inserted into the tooth groove on the second rack, the positioning seat corresponding to the second positioning guide block is lifted up and rotated, and then abutted against the upper surface of the clamping auxiliary rod to position the slider; in this way, the Nth rack is loaded into the clamping gap, the Nth rack is arranged side by side next to the (N-1)th rack, and the slider is pushed to move in the positioning slot, so that the Nth positioning guide block is inserted into the tooth groove on the Nth rack, the positioning seat corresponding to the Nth positioning guide block is lifted up and rotated, and then abutted against the upper surface of the clamping auxiliary rod to position the slider; S4, the telescopic rod of the piston cylinder extends outward, so that the end of the push rod presses against the outermost rack, so that all the racks are clamped between the push rod and the fixed clamping bar. At this time, the tooth grooves of all the racks are aligned to form a long tooth groove, and the long tooth groove is parallel to the positioning groove on the clamping auxiliary rod; S5, the positioning seat is lifted up and rotated, and then the positioning seat is released, so that the positioning seat abuts against the slider, the positioning seat loses the limit of the slider, and the slider is moved to make the positioning guide block slide away from the long tooth groove; S6, pull out the limit pin from the limit hole, rotate the clamping auxiliary rod, and make the clamping auxiliary rod and the clamping seat staggered.

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