Tool clamp for switching between horizontal clamping and vertical clamping of standard knot

Abstract

The tool clamp comprises a rotary table, a rotary clamping assembly and a positioning assembly, a containing table is installed on the rotary table, a hydraulic cylinder is installed between the rotary table and the containing table in a bolt fastening mode, and lifting of the containing table is achieved through the hydraulic cylinder; the rotary clamping assembly is installed on the rotary table, the positioning assembly is installed on the containing table, the rotary clamping assembly is arranged between the rotary clamping assembly and the rotary table, and the horizontal type or the vertical type of the standard knot is switched through the rotary clamping assembly. Horizontal clamping and vertical clamping of the standard knot can be achieved through one set of tool clamp, in this way, machining of a tenon, a tenon nut and a pin hole on the end face of the standard knot is completed on the same set of tool clamp, the precision of the machining content is guaranteed, only one-time clamping is needed in the whole machining procedure, the machining efficiency is improved, and meanwhile the labor intensity of workers is reduced.

Description

Technical Field

[0001] This invention relates to the field of tower crane standard section processing equipment, specifically to a tooling fixture for switching between horizontal and vertical clamping of standard sections. Background Technology

[0002] After the pin holes on the ends and sides of the standard section are machined, in order to ensure the subsequent connection between standard sections, the pin holes on the ends and sides of the standard section need to be precision machined. The current precision machining is divided into two steps: first, the standard section is clamped on the turntable by horizontal clamping, and the end of the standard section is machined by a horizontal machining center. After the end is machined, the standard section is clamped vertically on the turntable, and the pin holes on the side of the standard section column are machined by a horizontal machining center. This requires two clamping and two machining. Due to the large size of the standard section, the two clamping is difficult, the labor intensity of the workers is high, and the processing efficiency is reduced accordingly. The tenon on the end face of the lower standard section is assembled with the mortise and tenon of the upper standard section, and the pin hole on the side is also needed for locking. When the pin hole and the tenon and mortise and tenon are placed on two clamping centers for machining, the positional accuracy of the pin hole and the tenon and mortise and tenon cannot be guaranteed, which makes it impossible to insert the locking pin into the pin hole during assembly. Summary of the Invention

[0003] To address the shortcomings of the existing technology, this invention proposes a tooling fixture that allows for switching between horizontal and vertical clamping of standard sections. A single tooling fixture can achieve both horizontal and vertical clamping of standard sections. This allows for the machining of the tenons, nutlets, and pin holes on the end face of the standard section on the same fixture, ensuring the accuracy of the machining. The entire machining process requires only one clamping operation, improving machining efficiency and reducing the labor intensity of workers.

[0004] To achieve the above objectives, the present invention provides a tooling fixture for switching between horizontal and vertical clamping of standard sections, comprising a turntable, a rotary clamping assembly, and a positioning assembly. A placement platform is mounted on the turntable, and a hydraulic cylinder is installed between the turntable and the placement platform by bolts. The hydraulic cylinder is used to raise and lower the placement platform. The rotary clamping assembly is mounted on the turntable, and the positioning assembly is mounted on the placement platform. A rotary clamping assembly is provided between the rotary clamping assembly and the turntable, and the horizontal / vertical clamping of the standard section is switched by the rotary clamping assembly. The rotary clamping assembly includes a rotating frame, support columns, and a clamping assembly. Two opposing support columns are installed on the turntable, and a rotating frame that rotates on each support column is installed on each support column. The two sets of rotating frames are driven by a synchronous drive assembly. A telescopic clamping assembly is provided inside the rotating frame to clamp the standard section. The positioning components include a lifting positioning module and a cylindrical positioning module. A groove is cut into the placement platform, and the lifting positioning module is inserted into the groove. Multiple sets of male and female tenon positioning blocks are installed on the top of the lifting positioning module. An adjustment component that drives the male and female tenon positioning blocks to move is set in the middle of the multiple sets of male and female tenon positioning blocks. Two sets of cylindrical positioning modules are installed on the placement platform, and the cylindrical positioning modules make way for the lifting positioning blocks.

[0005] Preferably, the rotating frame is a ring frame, which is mounted on the supporting column via bearings. A first sprocket is mounted on the outer circumference of the ring frame, and a second sprocket driven by a motor is mounted on the supporting column. The first and second sprockets are connected by a chain. A mounting plate is mounted on the inner wall of the rotating frame, and the mounting plate slides against the rotating frame. A hydraulic cylinder is provided between the rotating frame and the mounting plate. A clamping assembly is mounted on the mounting plate, which includes a swing arm, clamping wheels, and clamping blocks. Each mounting plate has two opposing clamping blocks, which slide against the mounting plate. In conjunction with this, a trigger rod is provided on the inner side of the mounting plate, and a guide rod is installed on the trigger rod. The guide rod slides through the mounting plate. A spring is fixed between the guide rod and the back of the mounting plate to push the guide rod inward. The end of the guide rod is connected to the clamping block through a pull rod. Two sets of swing arms are installed on the inner wall of the mounting plate, and a clamping wheel is installed on each set of swing arms. The clamping wheel has an annular groove. The support column of the standard section is inserted into the annular groove of the clamping wheel. At the same time, a pull rod is hinged between the outer wall of the guide rod and the swing arm. When the guide rod moves outward, the clamping wheel clamps the standard section.

[0006] Preferably, four sets of male and female tenon positioning blocks are installed on the top of the placement platform. A sliding groove is provided on the placement platform for the male and female tenon positioning blocks to slide within the groove. The adjusting component is a motor-driven rotating disk. A rotating disk is installed on the placement platform, and a motor is installed on both the rotating disk and the placement platform. The motor drives the rotation of the rotating disk. A connecting rod is hinged between the rotating disk and the male and female tenon positioning blocks. The position of the male and female tenons is switched by moving the male and female tenon positioning blocks. Side holes for dowel holes are provided on the sides of the male and female tenon positioning blocks. Multiple sets of cylindrical positioning modules are arranged side-by-side on the placement platform. Each cylindrical positioning module is two sets of V-shaped positioning blocks arranged side-by-side. The support base of the standard section is secured to the V-shaped positioning blocks. When the multiple sets of male and female tenon positioning blocks move towards the center and close together, they make way for the support column of the standard section.

[0007] Preferably, a lifting locking plate is installed above the rotating disk, and a lifting hydraulic cylinder is provided between the lifting locking plate and the placement platform. Multiple limiting inclined blocks arranged in a circular array are provided below the lifting locking plate. The limiting inclined blocks slide with the lifting locking plate. A spring is provided between the limiting inclined blocks and the lifting locking plate to press the limiting inclined blocks downward. A limiting inclined groove is opened above the rotating disk to fit with the limiting inclined blocks. Positioning is achieved through the limiting inclined groove and the limiting inclined blocks.

[0008] Preferably, a locking element is installed on the rotating frame. Four trapezoidal slots arranged in a circular array are provided on the outer circumference of the rotating frame. The locking element consists of two clamping blocks that clamp the outer wall of the rotating frame. Trapezoidal blocks that fit against the outer wall of the trapezoidal slots are installed on the inner wall of the clamping blocks. Each clamping block slides against the placement platform. Pull tabs are installed on the two clamping blocks and are hinged to the same linkage rod. A vertical rod is fixed at the bottom of the linkage rod and passes through the placement platform for lifting and lowering. Linkage plates are provided at both ends of the linkage rod, and guide inclined holes are installed on the linkage plates. The linkage rod extends into the guide inclined holes, and the clamping blocks are linked with the placement platform. A guide plate is installed on the placement platform outside the placement platform and slides against the placement platform. The guide plate is fixed to the linkage plate and has a guide hole with the bottom of the guide hole inclined outward and the middle and top of the guide hole vertically arranged. A sliding column extending into the guide hole is fixed on the outside of the placement platform.

[0009] Compared with the prior art, the solution of the present invention is that a set of tooling fixtures can realize both horizontal and vertical clamping of standard sections. In this way, the tenons, nut, and pin holes on the end face of the standard section can be processed on the same set of tooling fixtures, thus ensuring the accuracy of the processed content. The entire processing process only requires one clamping, improving processing efficiency and reducing the labor intensity of workers. Attached Figure Description

[0010] Figure 1 This is the front view of the present invention.

[0011] Figure 2 This is a top view of the present invention.

[0012] Figure 3 This is a perspective view of the present invention.

[0013] Figure 4 This is a schematic diagram of the half-clamping component of the present invention.

[0014] Figure 5 This is a schematic diagram of the rotating frame clamping mechanism of the present invention.

[0015] Figure 6 This is a front view of the rotating frame clamping mechanism of the present invention.

[0016] Figure 7This is a schematic diagram of the mounting plate of the present invention.

[0017] Figure 8 This is a top view of the mounting plate of the present invention.

[0018] Figure 9 This is a schematic diagram of the adjustment component of the present invention.

[0019] Figure 10 This is a schematic diagram of the lifting locking plate and rotating plate of the present invention.

[0020] The components include: 1. Turntable; 2. Rotary clamping assembly; 3. Rotary frame; 4. First sprocket; 5. Second sprocket; 6. Synchronous drive assembly; 7. Mounting plate; 8. Clamping assembly; 9. Swing arm; 10. Clamping wheel; 11. Clamping block; 12. Trigger rod; 13. Guide rod; 14. Support column; 16. Positioning assembly; 17. Lifting and positioning module; 19. Tenon and mortise positioning block; 21. Side hole; 22. Rotary disk; 23. Adjustment assembly; 24. Cylindrical positioning module; 25. V-shaped positioning block; 27. Placement platform; 28. Lifting and locking disk; 29. ​​Limiting inclined block; 30. Limiting inclined groove; 31. Locking component; 32. Trapezoidal groove; 33. Trapezoidal block; 34. Linkage rod; 35. Vertical rod; 36. Linkage piece; 37. Guide inclined hole; 38. Guide plate; 39. Guide hole; 40. Sliding column. Detailed Implementation

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] like Figure 1-10 As shown, a tooling fixture for switching between horizontal and vertical clamping of standard sections includes a turntable 1, a rotary clamping assembly 2, and a positioning assembly 16. The turntable 1 is a turntable that can rotate 360° on the ground. A hydraulic cylinder is installed between the turntable 1 and the placement platform 27 by bolts, and the hydraulic cylinder realizes the lifting and lowering of the placement platform 27. The rotary clamping assembly 2 is installed on the turntable 1, and the positioning assembly 16 is installed on the placement platform 27. A lifting and lowering hydraulic cylinder is installed between the placement platform 27 and the turntable 1. The lifting and lowering of the placement platform 27 is achieved by the lifting and lowering of the hydraulic cylinder. The positioning component 16 positions the male tenon, female tenon, and outer circumference of the standard section. The rotating clamping component 2 is set between the rotating clamping component 2 and the turntable 1. The rotating clamping component 2 switches the standard section between horizontal and vertical. When the standard section is clamped horizontally, the male tenon and female tenon of the standard section are precision machined. When the standard section is processed vertically, the pin holes on the male tenon and female tenon of the standard section are precision machined. In this way, two processing tasks are completed in one clamping. The rotary clamping assembly 2 includes a rotating frame 3, support columns 14, and a clamping assembly 8. Two opposing support columns 14 are bolted onto the turntable 1. A rotating frame 3, which rotates on each support column 14, is mounted on each column. A rotating shaft is welded to the outer side of the rotating frame 3, passing through the support column 14. The support column 14 and the rotating shaft are rotatably connected via bearings. The two sets of rotating frames 3 are driven by a synchronous drive assembly 6 (synchronous drive consists of two identical motors that start and stop synchronously; the motor mounts are bolted onto the support columns). On the inner wall of column 14, sprockets are fixed to the outer circumference of rotating frame 3 by welding. Sprockets are also fixed to the output shaft of motor by welding. The two sprockets are driven by a chain, and the rotating frame 3 is rotated by motor. A telescopic clamping assembly 8 is provided inside rotating frame 3. A hydraulic cylinder is installed between clamping assembly 8 and rotating frame 3 by bolt fastening. The gap between the two clamping assemblies 8 is adjusted by hydraulic cylinder. The standard section is clamped by clamping assembly 8. The standard section is lifted between the two clamping assemblies 8 by gantry crane. The clamping assembly 8 approaches and clamps the standard section. Positioning component 16 includes a lifting positioning module 17 and a cylindrical positioning module 24. Four grooves are formed on the placement platform 27. The lifting positioning module 17 slides into these grooves. Multiple sets of male and female tenon positioning blocks 19 (each tenon and female tenon positioning block 19 is essentially two positioning modules; the male tenon positioning module uses a circular sleeve, and the female tenon positioning module uses a male tenon head; side holes 20 are formed on the outer periphery of the circular sleeve and the male tenon head of the lifting positioning module 17) are installed on the top of the lifting positioning module 17. The tenon positioning block 19 is provided with an adjustment component 23 in the middle to drive the male and female tenon positioning blocks 19 to move; two sets of cylindrical positioning modules 24 are installed on the placement platform 27 by bolt fastening. The cylindrical positioning module 24 is a V-groove. The cylindrical positioning module 24 positions the outer wall of the support column of the standard section. The cylindrical positioning module 24 makes way for the lifting positioning block (the cylindrical positioning module 24 is located inside the lifting positioning block. When the lifting positioning block moves inward, it can make way for the cylindrical positioning module 24).

[0023] The rotating frame 3 is a ring frame. A first sprocket 4 is welded to the outer circumference of the ring frame. A second sprocket 5, driven by a motor, is mounted on the supporting column 14. The first sprocket 4 and the second sprocket 5 are transmitted through a chain, thus realizing the rotation of the rotating frame 3. A mounting plate 7 is provided on the inner wall of the rotating frame 3. The mounting plate 7 is slidably engaged with the rotating frame 3 (a rod is fixed to the mounting plate 7 by welding, and the rod slides through the rotating frame 3; a hydraulic cylinder that drives the mounting plate 7 to move is installed between the mounting plate 7 and the rotating frame 3 by bolts). A clamping assembly 8 is mounted on the mounting plate 7. The clamping assembly 8 includes a swing arm 9, a clamping wheel 10, and clamping blocks 11. Each mounting plate 7 is equipped with two opposing clamping blocks 11, which are slidably engaged with the mounting plate 7. A long through hole is opened in the mounting plate 7, and the clamping blocks 11 slide within the long through hole of the mounting plate 7. A trigger rod 12 is provided on the inner side of the mounting plate 7. A guide rod 13 is installed on the trigger rod 12 by welding. The guide rod 13 slides through the mounting plate 7. A spring that pushes the guide rod 13 inward is fixed between the guide rod 13 and the back of the mounting plate 7 by welding. The end of the guide rod 13 is connected to the clamping block 11 by a pull rod. Two sets of swing arms 9 are installed on the inner wall of the mounting plate 7 by hinge. A clamping wheel 10 is installed on each set of swing arms 9 by bearing. The clamping wheel 10 has a semi-circular annular groove. The outer circumference of the standard section support column is stuck in the annular groove. The support column of the standard section is stuck into the annular groove of the clamping wheel 10. At the same time, a pull rod is hinged between the outer wall of the guide rod 13 and the swing arm 9. When the guide rod 13 moves outward, the clamping wheel 10 clamps the standard section. When the clamping block 11 clamps the standard section, the clamping wheel 10 clamps the outer wall of the standard section.

[0024] Four sets of male and female tenon positioning blocks 19 are installed in the groove at the top of the placement platform 27. The placement platform 27 has sliding grooves for the male and female tenon positioning blocks 19 to slide within these grooves. A circular groove is located at the center of the placement platform 27, and an adjusting component 23 is embedded within it. The adjusting component 23 is a motor-driven rotating disk 22, which is secured within the circular groove of the placement platform 27. A motor is installed on the placement platform 27 by bolts, and the motor drives the rotating disk. The rotation of 22 is achieved by a connecting rod hinged between the rotating disk 22 and the male and female tenon positioning blocks 19. The position of the male and female tenons is switched by moving the male and female tenon positioning blocks 19. Two sets of cylindrical positioning modules 24 arranged side by side are fixed on the placement platform 27 by welding. The cylindrical positioning modules 24 are two sets of V-shaped positioning blocks 25 arranged side by side. The support seat of the standard section is stuck on the V-shaped positioning blocks 25. When multiple sets of male and female tenon positioning blocks 19 move towards the middle and close, they make way for the support column of the standard section.

[0025] A lifting locking plate 28 is installed above the rotating disk 22. A lifting hydraulic cylinder is fixed to the lifting locking plate 28 and the placement platform 27 by bolts. Multiple limiting inclined blocks 29 arranged in a circular array are fixed below the lifting locking plate 28. The limiting inclined blocks 29 slide in conjunction with the lifting locking plate 28 (a lifting groove is opened at the bottom of the lifting locking plate 28 for the limiting inclined blocks 29 to extend into; a spring is fixed between the lifting groove and the top of the limiting inclined block 29 by welding, and the spring presses the limiting inclined block 29 downwards). A mechanism is provided between the limiting inclined block 29 and the lifting locking plate 28 to press the limiting inclined block 29 downwards. The spring is compressed, and a limiting groove 30 is opened above the rotating disk 22 to fit with the limiting inclined block 29. The limiting groove 30 and the limiting inclined block 29 are positioned. When positioning is required, the lifting locking disk 28 descends and the rotating disk 22 rotates. When the limiting groove 30 of the rotating disk 22 moves below the limiting inclined block 29, the limiting inclined block 29 extends into the limiting groove 30, so the rotating disk 22 cannot rotate clockwise. When the male and female tenon positioning blocks 19 need to be closed, the rotating disk 22 needs to rotate counterclockwise. Due to the inclined surface design of the limiting inclined block 29 and the limiting groove 30, the counterclockwise rotation of the rotating disk 22 is not affected.

[0026] A locking element 31 is installed on the rotating frame 3. Four trapezoidal slots 32 arranged in a circular array are opened on the outer circumference of the rotating frame 3. The locking element 31 consists of two clamping blocks 11, which clamp the outer wall of the rotating frame 3. Trapezoidal blocks 33 that fit against the outer wall of the trapezoidal slots 32 are fixed to the inner wall of the clamping blocks 11 by welding. Each clamping block 11 slides between itself and the placement platform 27 (a straight rod is installed on the placement platform 27 by bolts, and the straight rod passes through...). Two clamping blocks 11 are provided, which slide against the placement platform 27. Hinged tabs are mounted on the two clamping blocks 11, and these tabs are hinged to the same linkage rod 34. The clamping blocks 11 move closer together or open apart by raising and lowering the linkage rod 34. A vertical rod 35 is welded to the bottom of the linkage rod 34, passing through the placement platform 27 and moving up and down. This restricts the linkage rod 34 to only moving up and down. Both ends of the moving rod 34 are provided with linkage plates 36, and guide inclined holes 37 are opened on the linkage plates 36. Both ends of the linkage rod 34 extend into the guide inclined holes 37. The clamping block 11 is linked with the placement platform 27. A guide plate 38 is installed on the outer side of the placement platform 27. The guide plate 38 slides with the placement platform 27. A sliding rod is also fixed on the placement platform 27 by bolts. The sliding rod passes through the guide plate 38, and the guide plate 38 moves on the sliding rod. The linkage plate is fixed by welding. A guide hole 39 is opened on the guide plate 38. The bottom of the guide hole 39 is inclined outward, and the middle and top of the guide hole 39 are vertically set. A sliding column 40 extending into the guide hole 39 is fixed on the outside of the placement platform 27 by welding. When the placement platform 27 lifts the single standard section for positioning, the guide plate 38 moves towards the placement platform 27. Under the action of the linkage plate 36, the linkage rod 34 moves downward, and the clamping block 11 locks and positions the rotating air.

Claims

1. A tool clamp for switching between horizontal clamping and vertical clamping of a standard section, comprising a rotary table, a rotary clamping assembly, a positioning assembly, a placement table is installed on the rotary table, a hydraulic cylinder is installed between the rotary table and the placement table by means of bolt fastening, the placement table is raised and lowered by the hydraulic cylinder, the rotary clamping assembly is installed on the rotary table, and the positioning assembly is installed on the placement table, characterized in that, The rotary clamping assembly is arranged between the rotary clamping assembly and the rotary table, and the horizontal / vertical of the standard section is switched through the rotary clamping assembly; The rotary clamping assembly comprises a rotary frame, a support column and a clamping assembly, wherein two oppositely arranged support columns are arranged on the rotary table, a rotary frame rotating on the support column is arranged on each support column, the two rotary frames are driven through a synchronous driving assembly, and a telescopic clamping assembly is arranged on the inner side of the rotary frame to clamp the standard section. The positioning assembly comprises a lifting positioning module and a cylindrical positioning module, a groove is formed in the placement table, the lifting positioning module is clamped into the groove, a plurality of male tenon and female tenon positioning blocks are arranged on the top of the lifting positioning module, and an adjusting assembly for moving the male tenon and female tenon positioning blocks is arranged between the male tenon and female tenon positioning blocks; two cylindrical positioning modules are arranged on the placement table, and the cylindrical positioning modules are used for allowing the lifting positioning blocks to pass.

2. The tool holder according to claim 1, wherein The rotary frame is a ring-shaped frame, the ring-shaped frame is arranged on the support column through a bearing, a first sprocket is arranged on the circumferential outer wall of the ring-shaped frame, a second sprocket is arranged on the support column and driven by a motor, and the first sprocket and the second sprocket are driven through a chain; an installation plate is arranged on the inner wall of the rotary frame, the installation plate is in sliding fit with the rotary frame, a hydraulic cylinder is arranged between the rotary frame and the installation plate, a clamping assembly is arranged on the installation plate, the clamping assembly comprises a swing arm, a clamping wheel and a clamping block, each installation plate is provided with two oppositely arranged clamping blocks in sliding fit with the installation plate, a trigger rod is arranged on the inner side of the installation plate, a guide rod is arranged on the trigger rod and slides through the installation plate, a spring is arranged between the guide rod and the back of the installation plate to push the guide rod inward, the end of the guide rod is connected to the clamping block through a pull rod, two swing arms are arranged on the inner wall of the installation plate, a clamping wheel is arranged on each swing arm, an annular groove is formed in the clamping wheel, the support column of the standard section is clamped into the annular groove of the clamping wheel, and a pull rod is hinged between the outer wall of the guide rod and the swing arm; when the guide rod moves outward, the clamping wheel clamps the standard section.

3. The tool holder according to claim 2, wherein Four male tenon and female tenon positioning blocks are arranged on the top of the placement table, a sliding groove is formed in the placement table for the sliding of the male tenon and female tenon positioning blocks, the male tenon and female tenon positioning blocks are clamped in the sliding groove and slide, the adjusting assembly is a motor-driven rotary disc, the rotary disc is arranged on the placement table, a motor is arranged on the rotary disc and the placement table to rotate the rotary disc, a connecting rod is hinged between the rotary disc and the male tenon and female tenon positioning blocks, the position of the male tenon and female tenon positioning blocks is switched through the movement of the male tenon and female tenon positioning blocks, and a side hole for punching a hole is formed in the side surface of the male tenon and female tenon positioning blocks; a plurality of cylindrical positioning modules are arranged on the placement table, the cylindrical positioning modules are two V-shaped positioning blocks arranged side by side, the support seat of the standard section is clamped on the V-shaped positioning blocks, and the support column of the standard section is allowed to pass when the plurality of male tenon and female tenon positioning blocks move towards the middle and close.

4. The tool holder according to claim 3, wherein The lifting locking disc is arranged above the rotating disc, a lifting hydraulic cylinder is arranged between the lifting locking disc and the placing table, a plurality of limit inclined blocks are arranged below the lifting locking disc in a ring array, the limit inclined blocks are in sliding fit with the lifting locking disc, springs are arranged between the limit inclined blocks and the lifting locking disc to press the limit inclined blocks downward, and a limit inclined groove is formed in the rotating disc in fit with the limit inclined blocks to position the limit inclined blocks.

5. The tool holder according to claim 4, wherein The locking member is arranged on the rotating frame, four trapezoidal grooves are arranged on the outer wall of the rotating frame in a ring array, the locking member is composed of two clamping blocks, the clamping blocks clamp the outer wall of the rotating frame, trapezoidal blocks are arranged on the inner wall of the clamping blocks in fit with the outer wall of the trapezoidal grooves, each clamping block is in sliding fit with the placing table, pull tabs are arranged on the two clamping blocks, the pull tabs on the two clamping blocks are hinged to the same linkage rod, a vertical rod is fixed to the bottom of the linkage rod to lift the placing table, linkage plates are arranged at the two ends of the linkage rod, guide inclined holes are arranged on the linkage plates, the linkage rod extends into the guide inclined holes, the clamping blocks are linked to the placing table, a guide plate is arranged on the outside of the placing table in sliding fit with the placing table, the guide plate is fixed to the linkage plate, a guide hole is formed in the guide plate, the bottom of the guide hole is inclined outward, the middle and top of the guide hole are arranged vertically, and a slide column extending into the guide hole is fixed to the outside of the placing table.

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