Station migration type tool

Abstract

The station migration type tool comprises a left table, a table shaft plate used for rotating the left table is arranged at the bottom of the left table, a rectangular left transverse plate is installed on the right side of the left table, a rectangular right transverse plate is installed at the right end of the left transverse plate, and rectangular sliding grooves are formed in the left transverse plate and the right transverse plate correspondingly; rectangular slideways are formed in the upper ends, close to the sliding grooves, of the left transverse plate and the right transverse plate, side ways perpendicular to the slideways are formed in the end wall of the side, close to the right transverse plate, of the left transverse plate, and side grooves perpendicular to the sliding grooves are formed in the end wall of the side, close to the right transverse plate, of the left transverse plate; a clamping groove and an edge buckling opening are formed in the end wall of the side, close to the sliding groove, of the right side of the left transverse plate. The station migration type tool has the beneficial effects that according to the station migration type tool, the positions of the clamping assemblies on the whole structure are controllable and adjustable, the machining stations can be migrated, the migration mode can be horizontal migration, and after vertical steering, the direction of the whole stroke can be vertically switched.

Description

Technical Field

[0001] The invention relates to the technical field of tooling, and in particular to a workstation transfer tooling. Background Art

[0002] Tooling is used to clamp the workpiece of the material. After the material is positioned, it is processed. The tooling will be equipped with clamps for clamping the material. The clamps are set on the plate to support the clamps. The clamps clamp the material to form a work station and cooperate with the processing equipment for processing.

[0003] Conventional tooling has a simple structure. The tooling plates are placed on a table to support the clamping parts. The clamping parts and the table are in a single position, and the clamping parts and the plates cannot be rotated or moved sideways, resulting in a fixed workstation after the clamping parts clamp the material. The clamping parts and the material are difficult to move horizontally or vertically after changing the stroke, resulting in a single workstation during processing, poor adaptability when used with processing equipment, and poor flexibility during processing. Summary of the invention

[0004] The purpose of the present invention is to provide a workstation migration tooling to solve the problem that the conventional tooling parts proposed in the above background technology have a simple structure, and the tooling plates are placed on a table to support the clamping parts. The clamping parts and the table have a single position, and the clamping parts and the plates cannot be rotated and shifted sideways, resulting in the workstation being fixed after the clamping parts clamp the material, and the clamping parts and the material are difficult to move horizontally and vertically after changing the stroke, resulting in a single workstation during processing, poor adaptability when cooperating with processing equipment, and poor flexibility during processing and use.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a workstation migration tooling, comprising a left platform, a platform shaft plate for rotating the left platform is provided at the bottom of the left platform, a rectangular left horizontal plate is installed on the right side of the left platform, a rectangular right horizontal plate is installed on the right end of the left horizontal plate, rectangular slide grooves are provided inside the left and right horizontal plates, rectangular slideways are provided near the upper ends of the slide grooves on the left and right horizontal plates, and a sideway is provided on the vertical slideway at the end wall of one side of the left horizontal plate near the right horizontal plate. The left horizontal plate is provided with a side groove at the vertical slide groove at the end wall on one side close to the right horizontal plate, and the left horizontal plate is provided with a clamping groove and a side buckle opening at the end wall on the right side close to the slide groove, and the clamping groove is provided with a clamping buckle fixedly connected to the right horizontal plate, and the clamping groove and the side buckle opening cooperate with the clamping buckle shape structure to form a clamping connection, so that the left horizontal plate and the right horizontal plate can be horizontally or vertically docked, and a disc-shaped slider is provided in the slide groove, and a cylindrical sliding column movably connected to the slide is provided at the upper end of the slider, and a clamping assembly is installed at the upper end of the sliding column.

[0006] Preferably, a straight buckle is fixed to the right end of the right horizontal plate, a right platform is installed on the right side of the right horizontal plate, a straight buckle opening for clamping the straight buckle is opened at the left end wall of the right platform, and a right screw is penetrated at the right end wall of the right horizontal plate.

[0007] Preferably, the slideway and the sideway have the same caliber, and the slide groove and the side groove have the same caliber, so that the straight buckle and the right platform can vertically change the stroke at the side groove and the sideway.

[0008] Preferably, the left platform and the left transverse plate are fixedly connected, and the right transverse plate and the left transverse plate are snap-fitted to each other through buckles and slots to form a horizontal docking, so that the slider and the slide column can move horizontally throughout the entire stroke.

[0009] Preferably, the right transverse plate and the left transverse plate are connected to each other through buckles and side buckle openings to form a vertical docking, so that the travel of the slider and the slide column on the left transverse plate and the right transverse plate can be vertically changed through the side channels and side grooves.

[0010] Preferably, the clamping assembly includes a rectangular top block fixedly connected to the top of the sliding column, a rectangular solid block fixed to the side end of the top block, and a screw passing through the middle of the solid block for limiting the top block.

[0011] Preferably, the clamping assembly also includes a concave font-shaped clamp fixedly connected to the upper end of the limiting top block, a disc-shaped reference platform for placing materials fixedly connected to the central end wall of the clamping plate recess, and a limiting screw relatively penetrated at the top end wall of the reference platform for screwing and positioning the material.

[0012] Preferably, the clamping assembly also includes a side notch opened on the side wall of the clamp plate, a connecting block fixed to the end wall at the side notch, a rotating shaft arranged at the end wall of the connecting block, a rectangular fixing plate installed at the rotating shaft away from the connecting block, a limiting screw for limiting the rotating shaft and passing through the end wall of the connecting block close to the rotating shaft, and a side fixing screw for limiting the material and passing through the end wall of the fixing plate on the side away from the rotating shaft.

[0013] Preferably, the connecting block, the rotating shaft, the fixing plate, and the side fixing screws are provided in two groups, each group is provided with two, and the rotating shaft rotates to rotate the fixing plate and spread out along the two sides of the limiting top block.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The position of the clamping assembly on the entire structure of the present invention is controllable and adjustable, and the processing station can be moved. The migration method can be horizontal migration, or it can be vertically turned so that the entire stroke can switch direction vertically.

[0016] 2. The rotating shaft at the connecting block of the present invention rotates to rotate the fixed plate to the side end of the splint, and the side fixing screw at the end wall of the fixed plate is screwed to limit the material from the side end of the material, which is convenient for the material to be firmly positioned at multiple nodes, with more positioning methods and more flexible positioning. Tightening the limiting screw can position the fixed plate after rotation, making it more stable when used.

[0017] 3. The right horizontal plate and the left horizontal plate of the present invention are connected with each other by buckles and side buckles to form a vertical docking. After the slider and the slide column move to the side channel and the side groove, a vertical turn is formed, and then they are moved to the slide groove and the slideway of the right horizontal plate, so that the slider and the slide column can slide and move after the vertical turn, and the clamping assembly can also be vertically turned and displaced accordingly, so as to achieve the purpose of vertically migrating the position of the clamping assembly and vertically adjusting the workstation. When in use, the workstation switching range is larger and the methods are more diverse.

[0018] 4. The slideway and sideway of the present invention have the same caliber, and the slide groove and side groove have the same caliber, so that the straight buckle and the right platform can vertically change the stroke at the side groove and the sideway. The left platform and the left horizontal plate are fixedly connected, and the right horizontal plate and the left horizontal plate are connected by buckles and grooves to form a horizontal connection, so that the slider and the slide column can move horizontally throughout the entire stroke. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a workstation migration tooling of the present invention;

[0020] Figure 2 It is a front structural schematic diagram of a left platform, a left horizontal board, a right horizontal board and a right platform of a workstation transfer tooling of the present invention;

[0021] Figure 3 It is a schematic diagram of the side view structure of a clamping plate of a workstation transfer tooling of the present invention;

[0022] Figure 4 It is a schematic diagram of the local structure of the connecting block and the rotating shaft of a station migration type fixture clamp of the present invention;

[0023] Figure 5 A station transfer tooling of the present invention Figure 1 Enlarged structural diagram at A in the middle.

[0024] In the figure: 1, left table; 2, table axis plate; 3, left horizontal plate; 4, right horizontal plate; 5, slide groove; 6, slide way; 7, side way; 8, buckle; 9, slot; 10, side buckle mouth; 11, straight buckle; 12, right table; 13, straight buckle mouth; 14, right screw; 15, slider; 16, slide column; 17, top block; 18, fixed block; 19, screw; 20, splint; 21, reference table; 22, side groove; 23, limit screw; 24, side groove; 25, connecting block; 26, rotating shaft; 27, limit screw; 28, fixing plate; 29, side fixing screw. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] See also Figure 1-5 The present invention provides a technical solution: a workstation migration tooling, comprising a left platform 1, a platform shaft plate 2 for rotating the left platform 1 is provided at the bottom of the left platform 1, a rectangular left horizontal plate 3 is installed on the right side of the left platform 1, a rectangular right horizontal plate 4 is installed on the right end of the left horizontal plate 3, a straight buckle 11 is fixed on the right end of the right horizontal plate 4, a right platform 12 is installed on the right side of the right horizontal plate 4, a straight buckle opening 13 for clamping the straight buckle 11 is opened at the left end wall of the right platform 12, a right screw 14 is penetrated at the right end wall of the right horizontal plate 4, the straight buckle 11 and the straight buckle opening 13 are clamped and connected, so that the right horizontal plate 4 and the right platform 12 The two platforms are detachably connected together. After disassembly, the platform shaft plate 2 rotates, and the left platform 1, the left horizontal plate 3 and the right horizontal plate 4 connected thereto are rotated, so that the orientations of the left horizontal plate 3 and the right horizontal plate 4 are switched, and the regulation is more convenient and more flexible. After adjustment, the straight buckle 11 and the straight buckle mouth 13 are clamped, so that the right horizontal plate 4 and the right platform 12 are connected together to form a whole, and then the right screw 14 is tightened to connect the right platform 12 with the supporting surface supported by the right platform 12, and the entire left platform 1, the left horizontal plate 3 and the right horizontal plate 4 connected thereto are limited and positioned, which is convenient for regulation and positioning.

[0029] The left and right transverse plates 3 and 4 are provided with rectangular slide grooves 5, and the left and right transverse plates 3 and 4 are provided with rectangular slideways 6 near the upper ends of the slide grooves 5. The left transverse plate 3 is provided with a side channel 7 at the vertical slideway 6 at the end wall of one side near the right transverse plate 4, and the left transverse plate 3 is provided with a side groove 22 at the vertical slide groove 5 at the end wall of one side near the right transverse plate 4. A clamping groove 9 and a side buckle opening 10 are provided at the end wall of one side of the left transverse plate 3 near the slide groove 5. A clamping groove 8 fixedly connected to the right transverse plate 4 is provided in the clamping groove 9. The clamping groove 9 and the side buckle opening 10 are matched with the shape structure of the clamping groove 8 to form a clamping connection, so that the left transverse plate 3 The plate 3 and the right cross plate 4 are horizontally or vertically docked, a disc-shaped slider 15 is provided in the slide groove 5, and a cylindrical slide column 16 movably connected to the slideway 6 is provided on the upper end of the slider 15. A clamping assembly is installed on the upper end of the slide column 16. The slideway 6 and the sideway 7 have the same diameter, and the slide groove 5 and the side groove 22 have the same diameter, so that the straight buckle 11 and the right platform 12 can change the stroke vertically at the side groove 22 and the sideway 7. The left platform 1 and the left cross plate 3 are fixedly connected, and the right cross plate 4 and the left cross plate 3 are clamped by the buckle 8 and the clamping groove 9 to form a horizontal docking, so that the slider 15 and the slide column 16 can move horizontally throughout the stroke;

[0030] The right cross plate 4 and the left cross plate 3 are connected by the buckle 8 and the side buckle mouth 10 to form a vertical docking, so that the stroke of the slider 15 and the slide column 16 on the left cross plate 3 and the right cross plate 4 can be vertically changed through the side channel 7 and the side groove 22, wherein the slider 15 and the slide column 16 are both rectangular, the slider 15 is used to slide in the connected slide groove 5 and the side groove 22, and the slide column 16 is used to slide in the connected side channel 7 and the slide 6. When it is necessary to simply move the slider 15 and the slide column 16 horizontally, the right cross plate 4 and the left cross plate 3 are connected by the buckle 8 and the slot 9 to form a horizontal docking, the side channel 7 and the slide groove 5 on the right cross plate 4 will be connected with the side channel 7 and the slide groove 5 on the left cross plate 3, and form a horizontal shape, so that the slider 15 and the slide column 16 can slide horizontally, and the clamping assembly can also be horizontally moved accordingly. The horizontal sliding displacement can achieve the purpose of horizontally migrating the position of the clamping component and horizontally adjusting the workstation. When it is necessary to vertically switch the movement stroke of the slider 15 and the slide column 16, the right horizontal plate 4 and the left horizontal plate 3 are connected by the buckle 8 and the side buckle mouth 10 to form a vertical docking, so that the stroke of the slider 15 and the slide column 16 on the left horizontal plate 3 and the right horizontal plate 4 is vertically changed through the side channel 7 and the side groove 22. After the slider 15 and the slide column 16 move into the side channel 7 and the side groove 22, a vertical turn is formed, and then they are moved into the slide groove 5 and the slideway 6 of the right horizontal plate 4, so that the slider 15 and the slide column 16 can slide and displace after vertical turning, so that the clamping component can also be vertically turned and displaced accordingly, so as to achieve the purpose of vertically migrating the position of the clamping component and vertically adjusting the workstation. When in use, the workstation switching range is larger and the methods are more abundant.

[0031] The clamping assembly includes a rectangular top block 17 fixedly connected to the top of the slide column 16, a rectangular solid block 18 fixed to the side end of the top block 17, and a screw 19 for limiting the top block 17 and passing through the middle of the solid block 18. The screw 19 at the limit top block 17 is screwed to lock the limit top block 17, and the limit top block 17 slides and moves with the slide column 16 and the slider 15 to change the position of the entire clamping assembly, so that the clamping assembly can move horizontally in the stroke, and can move after switching the orientation vertically. The movement mode is richer and more flexible, the station adjustment is more flexible, and it is more suitable for processing equipment.

[0032] The clamping assembly also includes a concave font-shaped clamping plate 20 fixedly connected to the upper end of the limiting top block 17, a disc-shaped reference platform 21 fixedly connected to the central end wall of the notch of the clamping plate 20 for placing materials, and a limiting screw 23 for screwing and positioning the material and relatively penetrated at the top wall of the reference platform 21. The clamping assembly also includes a side notch 24 opened at the side wall of the clamping plate 20, a connecting block 25 fixed to the end wall at the side notch 24, a rotating shaft 26 arranged at the end wall of the connecting block 25, a rectangular fixing piece 28 installed at the rotating shaft 26 away from the connecting block 25, a limiting screw 27 for limiting the rotating shaft 26 and penetrated at the end wall of the connecting block 25 close to the rotating shaft 26, and a fixing piece 28 for penetrating a side end wall of the fixing piece 28 away from the rotating shaft 26. As for the side fixing screw 29 for limiting the material, the connecting block 25, the rotating shaft 26, the fixing plate 28 and the side fixing screw 29 are all provided with two groups, and each group is provided with two. The rotating shaft 26 rotates, and the fixing plate 28 is rotated to unfold along the two sides of the limiting top block 17. The material is placed on the reference table 21, and then the limiting screw 23 is screwed to perform a preliminary and simple positioning of the material. After that, the rotating shaft 26 at the connecting block 25 rotates to rotate the fixing plate 28 to the side end of the splint 20, and the side fixing screw 29 at the end wall of the fixing plate 28 is screwed to limit the material from the side end of the material, which is convenient for the material to be firmly positioned at multiple nodes, with more abundant positioning methods and more flexible positioning. The limiting screw 27 is tightened to position the fixed plate 28 after rotation, which is more stable when used.

[0033] In summary, when the station migration tooling is used,

[0034] The material is placed on the reference table 21 at the clamping plate 20, and the limiting screw 23 is screwed to simply limit the positioning of the two ends of the material. Then, the rotating shaft 26 at the side groove 22 is rotated, and the fixed plate 28 is turned. After the fixed plate 28 is expanded laterally, the limiting screw 27 is tightened to limit the rotating shaft 26 and the fixed plate 28, and then the side fixing screw 29 is screwed to position the material. When the side fixing screw 29 is expanded laterally, the position of the side fixing screw 29 is flexibly controllable, and the side fixing screw 29 cooperates with the limiting screw 23 to perform multi-node positioning and limiting of the material;

[0035] At this time, the right horizontal plate 4 and the left horizontal plate 3 can be connected by the buckle 8 and the slot 9 to form a horizontal connection. The side channel 7 and the slide groove 5 on the right horizontal plate 4 will be connected with the side channel 7 and the slide groove 5 on the left horizontal plate 3, and form a horizontal shape, so that the slider 15 and the slide column 16 can slide horizontally. The slider 15 and the slide column 16 slide along the slide groove 5 and the slideway 6 respectively, and the slider 15 and the slide column 16 are slid sideways, so that the entire clamping assembly moves sideways, so as to achieve the purpose of horizontally migrating the processing station;

[0036] The right horizontal plate 4 and the left horizontal plate 3 are connected by the buckle 8 and the side buckle mouth 10 to form a vertical docking, so that the stroke of the slider 15 and the slide column 16 on the left horizontal plate 3 and the right horizontal plate 4 is vertically changed through the side channel 7 and the side groove 22. After the slider 15 and the slide column 16 move into the side channel 7 and the side groove 22, they form a vertical turn, and then move into the slide groove 5 and the slideway 6 of the right horizontal plate 4, so that the slider 15 and the slide column 16 can slide and move after vertically turning, so that the clamping assembly can also be vertically turned and displaced accordingly, so as to achieve the purpose of vertically migrating the position of the clamping assembly and vertically adjusting the workstation. When in use, the workstation switching range is larger and the methods are more abundant.

[0037] The screw 19 at the fixed block 18 is tightened to lock the limit top block 17 and position the clamping plate 20 after the migration and regulation station;

[0038] The straight buckle mouth 13 and the straight buckle 11 are removed to disassemble the right table 12 and the right transverse plate 4, and the table shaft plate 2 at the bottom of the left table 1 is rotated to rotate the left table 1, the left transverse plate 3, and the right transverse plate 4, and switch the orientation of the left transverse plate 3 and the right transverse plate 4, so that the positions of the left transverse plate 3 and the right transverse plate 4 are controllable and adjustable when in use, and more flexible and convenient when used in conjunction with processing equipment. After adjusting the positions of the left transverse plate 3 and the right transverse plate 4, the straight buckle mouth 13 and the straight buckle 11 are assembled to connect the right table 12 and the right transverse plate 4 together, and then tighten the right screw 14 to connect the right table 12 with the supporting surface to form a positioning, and lock the right table 12 to limit the position;

[0039] The position of the clamping components on the entire structure is controllable and adjustable, and the processing station can be moved. The migration method can be horizontal migration, or it can be vertically turned so that the entire stroke can switch direction vertically.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A workstation transfer tool, comprising a left platform (1), characterized in that: The bottom of the left platform (1) is provided with a platform shaft plate (2) for rotating the left platform (1), a rectangular left horizontal plate (3) is installed on the right side of the left platform (1), a rectangular right horizontal plate (4) is installed on the right end of the left horizontal plate (3), rectangular sliding grooves (5) are opened inside the left horizontal plate (3) and the right horizontal plate (4), and rectangular slideways (6) are opened near the upper ends of the sliding grooves (5) on the left horizontal plate (3) and the right horizontal plate (4), and a sideway (7) is opened vertically on the slideway (6) at the end wall of one side of the left horizontal plate (3) close to the right horizontal plate (4), and the vertical slideway ( 5) is provided with a side groove (22), and a clamping groove (9) and a side buckle opening (10) are provided at the end wall of the right side of the left horizontal plate (3) adjacent to the slide groove (5), and a clamping buckle (8) fixedly connected to the right horizontal plate (4) is provided in the clamping groove (9), and the clamping groove (9) and the side buckle opening (10) are matched with the shape structure of the clamping buckle (8) to form a clamping connection, so that the left horizontal plate (3) and the right horizontal plate (4) are horizontally or vertically docked, and a disc-shaped slider (15) is provided in the slide groove (5), and a cylindrical slide column (16) movably connected to the slideway (6) is provided at the upper end of the slider (15), and a clamping component is installed at the upper end of the slide column (16).

2. The station transfer tooling according to claim 1, characterized in that: A straight buckle (11) is fixed to the right end of the right transverse plate (4), a right platform (12) is installed on the right side of the right transverse plate (4), a straight buckle opening (13) for clamping the straight buckle (11) is opened at the left end wall of the right platform (12), and a right screw (14) is penetrated at the right end wall of the right transverse plate (4).

3. The station transfer tooling according to claim 1, characterized in that: The slideway (6) and the sideway (7) have the same caliber, while the slideway (5) and the sideway (22) have the same caliber, so that the straight buckle (11) and the right platform (12) can vertically change the stroke at the sideway (22) and the sideway (7).

4. The station transfer tooling according to claim 1, characterized in that: The left platform (1) and the left transverse plate (3) are fixedly connected, and the right transverse plate (4) and the left transverse plate (3) are clamped together through buckles (8) and clamping grooves (9) to form a horizontal docking, so that the slider (15) and the slide column (16) can move horizontally throughout the entire stroke.

5. The station transfer tooling according to claim 1, characterized in that: The right transverse plate (4) and the left transverse plate (3) are connected to each other through buckles (8) and side buckle openings (10) to form a vertical docking, so that the travel of the slider (15) and the slide column (16) on the left transverse plate (3) and the right transverse plate (4) can be vertically changed through the side channels (7) and the side grooves (22).

6. The station transfer tooling according to claim 1, characterized in that: The clamping assembly comprises a rectangular top block (17) fixedly connected to the top of the slide column (16), a rectangular solid block (18) fixed to the side end of the top block (17), and a screw (19) passing through the middle of the solid block (18) for limiting the top block (17).

7. The station transfer tooling according to claim 6, characterized in that: The clamping assembly further comprises a concave font-shaped clamping plate (20) fixedly connected to the upper end of the limiting top block (17), a disc-shaped reference platform (21) fixedly connected to the central end wall of the notch of the clamping plate (20) for placing materials, and a limiting screw (23) relatively penetrated at the top end wall of the reference platform (21) for screwing and positioning the material.

8. The station transfer tooling according to claim 6, characterized in that: The clamping assembly further comprises a side notch (24) provided at the side wall of the clamping plate (20), a connecting block (25) fixed to the end wall at the side notch (24), a rotating shaft (26) provided at the end wall of the connecting block (25), a rectangular fixing piece (28) installed at a part of the rotating shaft (26) away from the connecting block (25), a limiting screw (27) for limiting the rotating shaft (26) and passing through the end wall of the connecting block (25) close to the rotating shaft (26), and a side fixing screw (29) for limiting the material and passing through the end wall of the fixing piece (28) away from the rotating shaft (26).

9. The station transfer tooling according to claim 8, characterized in that: The connecting block (25), the rotating shaft (26), the fixing plate (28), and the side fixing screw (29) are all provided in two groups, each group is provided with two, and the rotating shaft (26) rotates to rotate the fixing plate (28) and spread out along the two sides of the limiting top block (17).

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