Four-side integrated machining tool for valve head

Abstract

The utility model belongs to the technical field of tool clamps, and particularly relates to a valve head four-face integrated machining tool. Comprising a base plate, the base plate is provided with an overturning unit and a clamping unit, a loading plate is horizontally clamped between the overturning unit and the clamping unit, the loading plate is provided with a plurality of machining groove positions used for containing machined parts, and the loading plate is provided with pressing units corresponding to the machining groove positions; when the pressing unit and the loading plate are connected, the machined part in the machining groove position can be pressed, and the overturning unit can drive the loading plate and the machined part on the loading plate to rotate so as to meet the machining requirements for different faces. According to the clamping device, the multiple machined parts can be clamped, and the machined parts can be driven to rotate by rotating the loading plate, so that the multiple faces of the machined parts are machined, re-clamping is not needed, the error risk caused by re-positioning is avoided, and the product quality is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of tooling fixtures, and in particular relates to a four-sided integrated processing tooling for a valve head. Background Art

[0002] In valve head machining, especially when multi-faceted drilling is involved, traditional single-clamp designs often only secure a single valve head. Switching to drilling operations on different faces requires frequent disassembly and re-clamping of the workpiece. This operating mode not only increases worker intensity but also significantly reduces overall production line efficiency. Furthermore, each repositioning operation carries a certain risk of positional error, which can lead to reduced hole accuracy and, in turn, compromise the quality of the final product. Utility Model Content

[0003] The purpose of this utility model is to address the above-mentioned technical problems and provide a four-sided integrated processing tool for a valve head, which can clamp multiple workpieces and drive the workpieces to rotate by rotating the loading plate, thereby meeting the needs of processing multiple surfaces of the workpiece without the need for re-clamping, avoiding the risk of errors caused by repositioning, and ensuring product quality.

[0004] In view of this, the utility model provides a four-sided integrated processing tool for a valve head, which is characterized in that it includes a seat plate, a flip unit and a clamping unit are provided on the seat plate, a loading plate is horizontally clamped between the flip unit and the clamping unit, a plurality of processing grooves for accommodating the processing parts are provided on the loading plate, and a clamping unit is provided on the loading plate corresponding to the processing grooves. When the clamping unit and the loading plate are connected, the processing parts in the processing grooves can be clamped, wherein the flip unit can drive the loading plate and the processing parts on the loading plate to rotate to meet the processing requirements of different surfaces.

[0005] In this technical solution, the base plate is clamped to the processing table by a pressure plate or other means, the flipping unit and the clamping unit on the base plate are threadedly connected to the pressure plate, and a horizontally arranged loading plate is clamped between the flipping unit and the clamping unit. The loading plate is provided with multiple processing slots, which can accommodate multiple workpieces at the same time to realize batch processing. In addition, the flipping unit can drive the loading plate and the workpiece on the loading plate to rotate, so that different surfaces of the workpiece can be processed, thereby avoiding the time consumption of frequent replacement of workpieces or adjustment of the workpiece position, and further improving production efficiency. The design of the clamping unit and the clamping unit ensures the stability of the workpiece during the processing, reduces the processing errors caused by vibration or movement, and thus improves the processing accuracy.

[0006] In the technical scheme, further, the processing groove position comprises a first through groove vertically penetrating the loading plate, the first through groove is coaxially connected with a first shoulder groove, the first shoulder groove is communicated with the surface of the loading plate, the first shoulder groove can support the processing piece, the first shoulder groove penetrates the side wall of the loading plate to form a side processing channel exposing the side machining hole of the processing piece, and the side processing channel is perpendicular to the length direction of the loading plate.

[0007] In the technical scheme, further, the pressing unit comprises a pressing plate and a fixing bolt penetrating the pressing plate and the loading plate and being threadedly connected, a first through hole is arranged in the middle of the pressing plate for the fixing bolt to pass through, and avoiding holes are symmetrically arranged on both sides of the first through hole, and a spacing groove is arranged on the bottom side of the pressing plate corresponding to the avoiding hole.

[0008] In the technical scheme, through the arrangement of the avoiding groove, the drill bit can drill the processing piece through the avoiding groove to meet the processing requirement.

[0009] In the technical scheme, further, the fixing bolt in the corresponding pressing unit between the two processing groove positions is provided with a pressing hole, and when the pressing unit is threadedly connected in the pressing hole, the pressing plate can press the processing pieces in the two processing groove positions.

[0010] In the technical scheme, that is, the fixing bolt is threadedly connected through the first through hole of the pressing plate and the pressing hole between the two processing groove positions on the loading plate, the first through hole is arranged in the middle of the pressing plate, so that when the pressing unit is connected with the loading plate, the pressing plate can uniformly press and fix the processing pieces in the two processing groove positions, that is, one pressing unit corresponds to the processing pieces in the two processing groove positions on the pressing plate, and the number of the pressing units is processing groove position / 2.

[0011] In the technical scheme, further, the bottom of the pressing plate is extended to be provided with a through pipe coaxial with the first through hole and communicated with the first through hole, the bottom of the through pipe is provided with a positioning protrusion, and the loading plate is provided with a positioning structure corresponding to the positioning protrusion.

[0012] In the technical scheme, further, the positioning structure comprises positioning grooves symmetrically arranged on both sides of the pressing hole, the positioning grooves comprise a second through groove and a third through groove coaxial with and communicated with each other, the second through groove is communicated with the surface wall of the loading plate close to the pressing plate, the diameter of the second through groove is greater than that of the third through groove, a positioning column is arranged in the second through groove, the side wall of the positioning column is abutted with the second through groove and partially protrudes from the second through groove to be abutted with the positioning protrusion.

[0013] In this technical solution, when installing the workpiece, the workpiece is placed in the processing groove, and a pressure plate is set on the top of two adjacent workpieces. The pressure plate is rotated so that the positioning protrusion on the lower side of the through tube at the bottom of the pressure plate abuts against the positioning column on one side to position the pressure plate. At this time, the direction of the pressure plate is consistent with the length direction of the loading plate. The pressure plate is fixed by the fixing bolts, and the clamping force of the pressure plate on the two workpieces below is more uniform, ensuring the clamping effect; when disassembling the workpiece, the fixing bolts can be released and the fixing bolts and the pressure plate can be directly removed, and then the workpiece can be removed. Alternatively, after releasing the fixing bolts, the pressure plate can be rotated until the positioning protrusion at the bottom of the pressure plate abuts against the positioning column on the other side. At this time, the length directions of the pressure plate and the loading plate are perpendicular, and the workpiece is taken out without interference from the pressure plate, and the next batch of workpieces to be processed can be replaced.

[0014] In the above technical solution, further, the flipping unit includes a right fixed seat arranged on one side of the loading plate, and a first motor is arranged on the side of the right fixed seat away from the loading plate. The output end of the first motor penetrates into the right fixed seat and is transmission-connected with the mounting seat. The first motor can drive the mounting seat to rotate, and the mounting seat is rotationally arranged on the right fixed seat. The mounting seat is threadedly connected with a chuck, and a chuck is provided with a chuck groove. The side end of the loading plate is provided with a convex column that can abut against the chuck groove.

[0015] In the above technical solution, further, the clamping unit includes a left fixed seat arranged on the side of the loading plate away from the right fixed seat, and a first cylinder is arranged on the side of the left fixed seat away from the loading plate. The output end of the first cylinder penetrates into the right fixed seat and is fixedly connected with the top block, and the top block and the left fixed seat are slidably connected, and a groove that can abut against the top block is provided at the side end of the loading plate.

[0016] In this technical solution, the left fixed seat, the right fixed seat and the seat plate are all threadedly connected. Through the setting of the clamping groove, the protruding column, the top block and the groove, the loading plate can be firmly clamped between the fixed seats on both sides, which has the characteristics of firm fixation and convenient disassembly and assembly. The loading plate can be rotated under the drive of the flip unit so that the processing surface of the workpiece in the processing slot is facing upward, meeting the drilling requirements.

[0017] The beneficial effects of the utility model are:

[0018] 1. The base plate is clamped to the processing table by a pressure plate or other means. The turning unit and clamping unit on the base plate are threadedly connected to the pressure plate. A horizontal loading plate is clamped between the turning unit and the clamping unit. The loading plate is provided with multiple processing slots, which can accommodate multiple workpieces at the same time to achieve batch processing.

[0019] 2. The turning unit can drive the loading plate and the workpiece on the loading plate to rotate, so that different surfaces of the workpiece can be processed, thus avoiding the time-consuming frequent replacement or adjustment of the workpiece position, further improving production efficiency. The design of the clamping unit and the pressing unit ensures the stability of the workpiece during the processing, reduces the processing errors caused by vibration or movement, and thus improves the processing accuracy;

[0020] 3. A through-tube coaxial with and connected to the first through-hole is extended from the bottom of the pressure plate. A positioning protrusion is provided at the bottom of the through-tube. A positioning structure is provided on the loading plate corresponding to the positioning protrusion to ensure that the pressure plate is evenly stressed when pressing the two workpieces, thereby ensuring the clamping effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the utility model;

[0022] Figure 2 It is a structural diagram of the loading plate;

[0023] Figure 3 It is a structural diagram of the pressure plate;

[0024] Figure 4 yes Figure 1 A partial enlarged view of point A in the middle;

[0025] Figure 5 is a partial cross-sectional view of the loading plate;

[0026] Figure 6 It is a structural diagram of the chuck.

[0027] The marks in the figure are:

[0028] 1. Seat plate; 2. Turning unit; 3. Clamping unit; 4. Loading plate; 5. Processing slot; 6. Workpiece; 7. Pressing unit; 8. First through slot; 9. First shoulder slot; 10. Side processing channel; 11. Pressing plate; 12. Fixing bolt; 13. First through hole; 14. Avoidance hole; 15. Spacing slot; 16. Pressing hole; 17. Through pipe; 18. Positioning protrusion; 19. Positioning slot; 20. Second through slot; 21. Third through slot; 22. Positioning column; 23. Right fixed seat; 24. First motor; 25. Mounting seat; 26. Chuck; 27. Clamping slot; 28. Protrusion; 29. ​​Left fixed seat; 30. First cylinder; 31. Top block; 32. Groove. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0030] In the description of this application, it should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0031] It should be noted that the terms "first," "second," etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and that the objects distinguished by "first," "second," etc. are generally of the same type, and do not limit the number of objects. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0032] It should be noted that, in the description of this application, the directions or positional relationships indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional terms do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional terms "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0033] It should be noted that, in the present application, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0034] First embodiment:

[0035] like Figures 1-6 As shown, this embodiment provides a four-sided integrated processing tool for a valve head, including a seat plate 1, on which a flip unit 2 and a clamping unit 3 are provided, a loading plate 4 is horizontally clamped between the flip unit 2 and the clamping unit 3, and the loading plate 4 is provided with a plurality of processing grooves 5 for accommodating the processing workpiece 6, and a clamping unit 7 is provided on the loading plate 4 corresponding to the processing groove 5. When the clamping unit 7 is connected to the loading plate 4, the processing workpiece 6 in the processing groove 5 can be clamped, wherein the flip unit 2 can drive the loading plate 4 and the processing workpiece 6 on the loading plate 4 to rotate to meet the processing requirements of different surfaces.

[0036] The base plate 1 is clamped to the processing table by a pressure plate 11 or other means. The flipping unit 2 and the clamping unit 3 on the base plate 1 are threadedly connected to the pressure plate 11. A horizontally arranged loading plate 4 is clamped between the flipping unit 2 and the clamping unit 3. A plurality of processing slots 5 are provided on the loading plate 4, which can accommodate multiple workpieces 6 at the same time to realize batch processing. In addition, the flipping unit 2 can drive the loading plate 4 and the workpiece 6 on the loading plate 4 to rotate, so that different surfaces of the workpiece 6 can be processed, thereby avoiding the time consumption of frequent replacement of workpieces or adjustment of the workpiece position, and further improving production efficiency. The design of the clamping unit 3 and the clamping unit 7 ensures the stability of the workpiece 6 during the processing process, reduces the processing errors caused by vibration or movement, and thus improves the processing accuracy.

[0037] like Figure 2As shown, the processing groove 5 includes a first through groove 8 that vertically passes through the loading plate 4. The first through groove 8 is coaxially connected to the first shoulder groove 9, and the first shoulder groove 9 is connected to the surface of the loading plate 4. The first shoulder groove 9 can support the workpiece 6. The first shoulder groove 9 passes through the side wall of the loading plate 4 to form a side processing channel 10 that exposes the side processing hole of the workpiece 6. The side processing channel 10 is perpendicular to the length direction of the loading plate 4.

[0038] like Figure 1-4 As shown, the clamping unit 7 includes a pressing plate 11 and a fixing bolt 12 threadedly connected through the pressing plate 11 and the loading plate 4. A first through-hole 13 for the fixing bolt 12 is provided in the middle of the pressing plate 11. Avoidance holes 14 are symmetrically provided on both sides of the first through-hole 13. Spacing grooves 15 are provided on the bottom side of the pressing plate 11 corresponding to the avoidance holes 14. The provision of the avoidance grooves allows the drill bit to pass through the avoidance grooves to drill the workpiece 6, meeting the processing requirements.

[0039] like Figure 1 As shown, the fixing bolts 12 in the corresponding pressing units 7 between the two processing slots 5 are provided with pressing holes 16. When the pressing units 7 are threadedly connected to the pressing holes 16, the pressing plates 11 can press the workpieces 6 in the processing slots 5 on both sides.

[0040] That is, the fixing bolt 12 passes through the first through hole 13 of the pressure plate 11 and is threadedly connected to the clamping hole 16 between the two processing grooves 5 on the loading plate 4. The first through hole 13 is set in the middle of the pressure plate 11 to ensure that when the clamping unit 7 and the loading plate 4 are connected, the pressure plate 11 can evenly press and fix the workpiece 6 in the two processing grooves 5, that is, one clamping unit 7 corresponds to the workpiece 6 in the two processing grooves 5 on the pressure plate 11, and the number of clamping units 7 is 5 / 2 of the processing grooves.

[0041] like Figure 1-4 As shown, a through pipe 17 coaxial with and connected to the first through hole 13 is extended from the bottom of the pressure plate 11 , a positioning protrusion 18 is provided at the bottom of the through pipe 17 , and a positioning structure corresponding to the positioning protrusion 18 is provided on the loading plate 4 .

[0042] The positioning structure includes positioning grooves 19 symmetrically arranged on both sides of the clamping hole 16. The positioning grooves 19 include a second through groove 20 and a third through groove 21 that are coaxial and interconnected. The second through groove 20 is connected to the surface wall of the loading plate 4 close to the side of the pressure plate 11. The diameter of the second through groove 20 is larger than that of the third through groove 21. A positioning column 22 is provided in the second through groove 20. The side wall of the positioning column 22 abuts against the second through groove 20 and partially extends out of the second through groove 20 to abut against the positioning protrusion 18.

[0043] When the workpiece 6 is installed, the workpiece 6 is placed in the processing groove 5, and the top of the two adjacent workpieces 6 is abutted with a pressure plate 11, and the pressure plate 11 is rotated so that the positioning protrusion 18 on the lower side of the through-tube 17 at the bottom of the pressure plate 11 abuts with the positioning column 22 on one side, and the pressure plate 11 is positioned. At this time, the direction of the pressure plate 11 is consistent with the length direction of the loading plate 4, and the pressure plate 11 is fixed by the fixing bolt 12. The pressing force of the pressure plate 11 on the two workpieces 6 below is more uniform, ensuring the pressing effect; when disassembling the workpiece 6, the fixing bolt 12 can be released and the fixing bolt 12 and the pressure plate 11 are directly removed, and then the workpiece 6 is removed. Alternatively, after releasing the fixing bolt 12, the pressure plate 11 can be rotated until the positioning protrusion 18 at the bottom of the pressure plate 11 abuts with the positioning column 22 on the other side. At this time, the length direction of the pressure plate 11 and the loading plate 4 is perpendicular, and the workpiece 6 is taken out without being interfered with by the pressure plate 11, and the next batch of workpieces 6 to be processed can be replaced.

[0044] like Figure 1 As shown, the flip unit 2 includes a right fixed seat 23 arranged on one side of the loading plate 4, and a first motor 24 is provided on the side of the right fixed seat 23 away from the loading plate 4. The output end of the first motor 24 penetrates the right fixed seat 23 and is transmission-connected with the mounting seat 25. The first motor 24 can drive the mounting seat 25 to rotate, and the mounting seat 25 is rotationally arranged on the right fixed seat 23. The mounting seat 25 is threadedly connected with a chuck 26, and a clamping groove 27 is provided on the chuck 26. The side end of the loading plate 4 is provided with a convex column 28 that can abut against the clamping groove 27.

[0045] like Figure 1 As shown, the clamping unit 3 includes a left fixed seat 29 arranged on the side of the loading plate 4 away from the right fixed seat 23, and a first cylinder 30 is provided on the side of the left fixed seat 29 away from the loading plate 4. The output end of the first cylinder 30 penetrates into the right fixed seat 23 and is fixedly connected to the top block 31. The top block 31 is slidably connected to the left fixed seat 29, and a groove 32 that can abut against the top block 31 is provided at the side end of the loading plate 4.

[0046] The left fixing seat 29, the right fixing seat 23 and the seat plate 1 are all threadedly connected. Through the arrangement of the clamping groove 27, the protruding column 28, the top block 31 and the groove 32, the loading plate 4 can be firmly clamped between the fixing seats on both sides, with the characteristics of firm fixation and convenient assembly and disassembly. The loading plate 4 can be rotated under the drive of the flip unit 2 so that the processing surface of the workpiece 6 in the processing slot 5 is facing upward, meeting the drilling requirements.

[0047] The embodiments of the present application are described above in conjunction with the accompanying drawings. Unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A four-sided integrated processing tool for a valve head, characterized in that: The invention comprises a base plate (1), a turning unit (2) and a clamping unit (3) are provided on the base plate (1), a loading plate (4) is horizontally clamped between the turning unit (2) and the clamping unit (3), a plurality of processing slots (5) for accommodating processing parts (6) are provided on the loading plate (4), and a pressing unit (7) is provided on the loading plate (4) corresponding to the processing slots (5). When the pressing unit (7) and the loading plate (4) are connected, the processing parts (6) in the processing slots (5) can be pressed. The turning unit (2) can drive the loading plate (4) and the processing parts (6) on the loading plate (4) to rotate to meet the processing requirements of different surfaces.

2. The four-side integrated processing tool for the valve head according to claim 1, characterized in that: The processing groove (5) includes a first through groove (8) vertically penetrating the loading plate (4); the first through groove (8) is coaxially connected to a first shoulder groove (9), and the first shoulder groove (9) is connected to the surface of the loading plate (4); the first shoulder groove (9) can support the processing workpiece (6); the first shoulder groove (9) penetrates the side wall of the loading plate (4) to form a side processing channel (10) exposing the side processing hole position of the processing workpiece (6); the side processing channel (10) is perpendicular to the length direction of the loading plate (4).

3. The four-side integrated processing tool for the valve head according to claim 2, characterized in that: The pressing unit (7) comprises a pressing plate (11) and a fixing bolt (12) threadedly connected through the pressing plate (11) and the loading plate (4); a first through hole (13) for the fixing bolt (12) to pass through is provided in the middle of the pressing plate (11); avoidance holes (14) are symmetrically provided on both sides of the first through hole (13); and a spacing groove (15) is provided on the bottom side of the pressing plate (11) corresponding to the avoidance holes (14).

4. The four-side integrated processing tool for the valve head according to claim 3 is characterized in that: The fixing bolt (12) in the corresponding pressing unit (7) between the two processing slots (5) is provided with a pressing hole (16). When the pressing unit (7) is threadedly connected to the pressing hole (16), the pressing plate (11) can press the processing parts (6) in the processing slots (5) on both sides.

5. A valve head four-side integrated processing tool according to any one of claims 3 and 4, characterized in that: A through pipe (17) coaxial with and connected to the first through hole (13) is extended from the bottom of the pressure plate (11), a positioning protrusion (18) is provided at the bottom of the through pipe (17), and a positioning structure is provided on the loading plate (4) corresponding to the positioning protrusion (18).

6. The valve head four-side integrated processing tool according to claim 5, characterized in that: The positioning structure includes positioning grooves (19) symmetrically arranged on both sides of the pressing hole (16), the positioning grooves (19) include a second through groove (20) and a third through groove (21) that are coaxial and interconnected, the second through groove (20) is connected to the surface wall of the loading plate (4) close to the side of the pressure plate (11), the diameter of the second through groove (20) is larger than that of the third through groove (21), a positioning column (22) is arranged in the second through groove (20), the side wall of the positioning column (22) is in contact with the second through groove (20), and a portion of the positioning column (22) extends out of the second through groove (20) and can contact the positioning protrusion (18).

7. The valve head four-side integrated processing tool according to claim 1, characterized in that: The flip unit (2) comprises a right fixed seat (23) arranged on one side of the loading plate (4); a first motor (24) is arranged on the side of the right fixed seat (23) away from the loading plate (4); an output end of the first motor (24) penetrates the right fixed seat (23) and is transmission-connected with a mounting seat (25); the first motor (24) can drive the mounting seat (25) to rotate; the mounting seat (25) is rotationally arranged on the right fixed seat (23); a chuck (26) is threadedly connected to the mounting seat (25); a chuck groove (27) is arranged on the chuck (26); and a convex column (28) capable of abutting against the chuck groove (27) is arranged on the side end of the loading plate (4) corresponding to the chuck groove (27).

8. A valve head four-side integrated processing tool according to any one of claims 1 and 7, characterized in that: The clamping unit (3) comprises a left fixed seat (29) arranged on a side of the loading plate (4) away from the right fixed seat (23); a first cylinder (30) is arranged on the side of the left fixed seat (29) away from the loading plate (4); an output end of the first cylinder (30) penetrates into the right fixed seat (23) and is fixedly connected to a top block (31); the top block (31) and the left fixed seat (29) are slidably connected; a groove (32) capable of abutting against the top block (31) is arranged on the side end of the loading plate (4).

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