Improved cutter cylinder pressing jig

Abstract

The utility model relates to the technical field of cutter cylinder machining, in particular to an improved cutter cylinder pressing jig which comprises a stamping base, a pressure bearing component, a supporting component, a hydraulic cylinder and a pressing component are integrally arranged on the stamping base, and the pressure bearing component comprises a fixing base installed on the stamping base and a pressure bearing block installed in front of the fixing base. The pressure bearing block is used for being arranged on the cutter cylinder in a sleeving mode and positioning the press-fit end of the cutter cylinder on the pressure bearing block, and the supporting component comprises a sliding groove formed in the stamping base, a supporting block connected to the sliding groove in a sliding mode and an elastic reset piece arranged on the stamping base and in elastic butt joint with the supporting block. The supporting block slides to the lower portion of the front end of the pressure-bearing block along the sliding groove by overcoming the elastic force of the elastic reset piece, and the front end of the pressure-bearing block is supported. And compared with the prior art, the key step that an operator forgets to support the front end of the pressure-bearing block is effectively avoided, and the conditions that the pressing efficiency is reduced and the service life of the pressure-bearing block is shortened due to insufficient support are avoided.

Description

Technical Field

[0001] This utility model relates to the field of tool barrel processing technology, and in particular to an improved tool barrel pressing fixture. Background Technology

[0002] Root vegetables and fruits, such as potatoes, radishes, and apples, are indispensable ingredients in people's daily diet. Before cooking, they need to be processed into strips, slices, and other shapes. This step is crucial, but it is both time-consuming and laborious, and also poses safety hazards. Initially, to solve this problem, kitchen utensils such as graters and slicers were developed. These utensils have holes punched into their surfaces, and people hold the food and rub it back and forth on them, turning the food into thin strips or slices. However, manual operation has always been difficult to balance convenience and safety.

[0003] As demand drives technological innovation, small household vegetable slicers have emerged. These slicers use a motor or hand crank to drive a cylindrical blade with slicing holes to rotate, achieving the purpose of slicing food and making food pre-processing more efficient.

[0004] The manufacturing process of the tool barrel involves several delicate steps. First, holes are punched and planed in the plate-shaped workpiece. Then, the two ends are bent in the opposite direction and rolled into a cylinder. Finally, the bent ends are joined together by folding edges and pressed together with a tool. In the prior art, such as the tool barrel pressing fixture with utility model authorization announcement number CN217371239U, the purely manual pressing has been replaced, significantly improving production efficiency.

[0005] However, this fixture has some significant drawbacks. Firstly, during the busy pressing process, operators often neglect to push the third top block to the lower end of the pressure-bearing section, resulting in a lack of support and affecting the pressing quality and effect. Secondly, the entire pressing process lacks any safety precautions; in the event of an accident, not only may the equipment be damaged, but the personal safety of the operators will also be threatened. Given these shortcomings, there is an urgent need to improve and optimize the tool barrel pressing fixture to make tool barrel production more efficient, safer, and more stable. Utility Model Content

[0006] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0007] An improved tool barrel pressing fixture includes a stamping base. A pressure-bearing component, a support component, a hydraulic cylinder, and a pressing component are integrated on the stamping base. The pressure-bearing component includes a fixed seat mounted on the stamping base and a pressure-bearing block mounted in front of the fixed seat. The pressure-bearing block is used to fit the tool barrel and position the pressing end of the tool barrel on the pressure-bearing block. The support component includes a slide groove on the stamping base, a support block slidably connected to the slide groove, and an elastic reset component mounted on the stamping base and elastically connected to the support block. The support block slides along the slide groove to the lower position of the front end of the pressure block by overcoming the elastic force of the elastic reset component, thereby supporting the front end of the pressure block.

[0008] The hydraulic cylinder is positioned downwards above the pressure-bearing and supporting components via a stamping base. The pressing component includes a lower pressure plate connected to the piston end of the hydraulic cylinder, a lower pressure block fixedly connected to the lower pressure plate and facing the pressure-bearing block, and a push block fixedly connected to the lower pressure plate and facing the supporting block. Both the supporting block and the push block have inclined surfaces that engage with each other. The push block is guided by the inclined surfaces to move the supporting block to engage with the pressure-bearing block. Both the supporting block and the push block also have straight surfaces that engage with each other. The push block uses the sliding engagement of the straight surfaces to allow the supporting block to complete the barrel pressing operation while remaining stationary. Safety light curtains are also installed on both sides of the front end of the stamping base.

[0009] Preferably, the pressure block is provided with a folded edge receiving groove, and a knife cylinder positioning and blocking strip is provided at the front end of the folded edge receiving groove.

[0010] Preferably, a protruding first pre-pressure strip is movably connected to one side of the bearing block corresponding to the folded edge receiving groove, and a first spring member is provided between the first pre-pressure strip and the bearing block to drive it to protrude. A protruding second pre-pressure strip is movably connected to the lower pressing block at the position corresponding to the other side of the receiving groove, and a second spring member is provided between the second pre-pressure strip and the lower pressing block to drive it to protrude.

[0011] Preferably, the upper end of the pressure block has an arc surface adapted to the inner wall of the knife cylinder, the lower end surface of the pressure block is adapted to the arc surface, the lower end of the pressure block has a flat surface that abuts against the support block, and a chamfered surface is provided on the starting edge of the flat surface that abuts against the support block.

[0012] Preferably, the stamping base includes a base plate, a support column vertically installed at the rear end of the base plate, and a top plate installed on the support column and directly above the base plate. The fixing seat and the slide are both set on the base plate, and the hydraulic rod is installed on the top plate.

[0013] Preferably, the slide is a dovetail-shaped structure that runs through both sides of the base plate, and the lower end of the support block is provided with a dovetail-shaped slider that is adapted to the slide.

[0014] Preferably, there are two support blocks and two push blocks, which are symmetrically arranged with respect to the pressure block, and the elastic reset member is arranged between the two support blocks.

[0015] Preferably, the elastic reset component includes a support seat installed in the middle of the slide groove, a connecting rod connected to the support seat and having its two ends respectively abutting against two support blocks, and a reset spring sleeved on the connecting rod and abutting between the support seat and the support blocks. A clearance groove is provided at one end of the support block that abuts the connecting rod, so that the support seat and the reset spring in a further compressed state can be accommodated between the two support blocks after they are abutted. A limiting hole is provided at the inner position of the support block located in the clearance groove, and the end of the connecting rod is restricted in the limiting hole to limit the stroke of the support block being bounced away by the reset spring.

[0016] Preferably, a guide rod is connected to the lower pressure plate, and a linear bearing adapted to the guide rod is provided on the top plate. The lower pressure plate and the top plate are guided and fitted together through the connection of the linear bearing and the guide rod.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] Its operational convenience is greatly improved. With the cooperation of the elastic reset component and the sliding connection of the support block, the support block is initially far from the pressure block, allowing the operator to easily position the cutter cylinder. After the cutter cylinder is placed, the hydraulic cylinder drives the support block to automatically complete the support of the front end of the pressure block and subsequent pressing using a sloped guide and straight transition. The operator only needs to perform simple operations such as placing and removing the cutter cylinder and starting the hydraulic cylinder. It also enhances the operation error prevention function. Compared with existing technologies, it effectively prevents operators from forgetting the crucial step of supporting the front end of the pressure block, eliminating situations where insufficient support leads to decreased pressing efficiency and shortened pressure block life. Furthermore, in terms of safety, the safety light curtains on both sides of the front end of the stamping base operate throughout the process. If the light is blocked, the hydraulic cylinder's downward movement immediately stops, effectively ensuring the operator's personal safety and making the entire cutter cylinder pressing process more efficient, safe, and stable.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a utility model Figure 1 Schematic diagram of the structure at point A;

[0023] Figure 3 This is a front structural diagram of the present invention in its initial state;

[0024] Figure 4 This is a front structural diagram of the push block pushing the support block according to this utility model;

[0025] Figure 5 This is a schematic cross-sectional view of the support block and elastic reset component in the state shown in the figure.

[0026] Figure 6 This is a schematic diagram of the front structure of the present invention in the pressed state;

[0027] Figure 7 This is a utility model Figure 4 A schematic diagram of the cross-sectional structure under the specified conditions;

[0028] Figure 8 This is a utility model Figure 7 Schematic diagram of the structure at point B;

[0029] Figure 9 This is a utility model Figure 6 A schematic diagram of the cross-sectional structure under the specified conditions;

[0030] Figure 10 This is a utility model Figure 9 A schematic diagram of the structure at point C.

[0031] The reference numerals and names in the figure are as follows:

[0032] The components include: a cutter barrel 1, a stamping base 10, a base plate 11, a support column 12, a top plate 13, a pressure-bearing component 20, a fixed seat 21, a pressure-bearing block 22, a folded edge receiving groove 23, a cutter barrel positioning stop bar 24, a first pre-pressure bar 25, a first spring component 26, a second pre-pressure bar 27, a second spring component 28, a support component 30, a sliding groove 31, a support block 32, a dovetail slider 321, a clearance groove 322, a limiting hole 323, an elastic reset component 33, a support seat 331, a connecting rod 332, a reset spring 333, a hydraulic cylinder 40, a pressing component 50, a pressing plate 51, a pressing block 52, a pushing block 53, an inclined surface 54, a straight surface 55, a guide rod 56, and a safety light curtain 60. Detailed Implementation

[0033] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] Please see Figure 1-10 In this embodiment of the present invention, an improved tool barrel pressing fixture includes a stamping base 10. A pressure-bearing component 20, a support component 30, a hydraulic cylinder 40, and a pressing component 50 are integrated on the stamping base 10. The pressure-bearing component 20 includes a fixed seat 21 installed on the stamping base 10 and a pressure block 22 installed in front of the fixed seat 21. The pressure block 22 is used to fit the tool barrel 1 and position the pressing end of the tool barrel 1 on the pressure block 22. The support component 30 includes a sliding groove 31 provided on the stamping base 10, a support block 32 slidably connected to the sliding groove 31, and an elastic reset member 33 provided on the stamping base 10 and elastically connected to the support block 32. The support block 32 slides along the sliding groove 31 to the lower position of the front end of the pressure block 22 by overcoming the elastic force of the elastic reset member 33, thereby supporting the front end of the pressure block 22.

[0035] The hydraulic cylinder 40 is positioned downwards above the pressure-bearing component 20 and the support component 30 via the stamping base 10. The pressing component 50 includes a pressing plate 51 connected to the piston end of the hydraulic cylinder 40, a pressing block 52 fixedly connected to the pressing plate 51 and facing the pressure block 22, and a pushing block 53 fixedly connected to the pressing plate 51 and facing the support block 32. Both the support block 32 and the pushing block 53 are provided with inclined surfaces 54 that engage with each other. The pushing block 53 pushes the support block 32 to engage with the pressure block 22 by being guided by the inclined surfaces 54. Both the support block 32 and the pushing block 53 are provided with straight surfaces 55 that engage with each other. The pushing block 53 completes the pressing operation of the cutter barrel 1 while keeping the support block 32 stationary by sliding the straight surfaces 55. Safety light curtains 60 are also provided on both sides of the front end of the stamping base 10.

[0036] During operation, the flanges formed at both ends of the blade cylinder 1 to be pressed are first fastened together. Then, the blade cylinder 1 is fitted onto the pressure block 22, positioning the fastened structure of the blade cylinder 1 at the upper end of the pressure block 22. At this time, the support block 32 is in its initial position under the action of the elastic reset member 33 and has not yet provided support for the front end of the pressure block 22. Next, the hydraulic cylinder 40 is activated, and the piston end of the hydraulic cylinder 40 begins to move downward, driving the connected lower pressure plate 51 downward. The lower pressure block 52 fixed on the lower pressure plate 51 presses directly downward toward the upper part of the pressure block 22 and the location of the blade cylinder 1. At the same time, the push block 53 on the lower pressure plate 51 also moves downward. As the push block 53 moves downward, due to the inclined surfaces 54 that engage with each other on the push block 53 and the support block 32, the push block 53 applies a horizontal force to the support block 32 with the guidance of the inclined surfaces 54, overcoming the elastic force of the elastic reset member 33, and pushing the support block 32 to slide along the slide groove 31 until it slides to the lower part of the front end of the pressure block 22, steadily supporting the front end of the pressure block 22, and working with the pressure block 22 to provide a stable force environment for the pressing of the knife cylinder 1; then, the lower pressure plate 51 continues to move downward, causing the push block 53 and the support block 32 to move downward. The fit between the two ends of the tool cylinder 1 changes from an inclined plane 54 fit to a straight plane 55 fit. During this process, the support block 32 remains stationary, while the pressing block 52 continues to move downwards to press the folded edge of the tool cylinder 1 after it is fastened, thus completing the connection and fixation of both ends of the tool cylinder 1. After the connection and fixation of both ends of the tool cylinder 1 is completed, the piston end of the hydraulic cylinder 40 retracts. Under the rebound of the elastic reset member 33, the push block 53 and the support block 32 move from a straight plane 55 fit to an inclined plane 54 fit and then finally separate, so that both the support block 32 and the pressing block 52 retract from the pressure block 22, allowing the pressed tool cylinder 1 to be removed. Throughout the entire process, the safety light curtains 60 set on both sides of the front end of the stamping base 10 operate continuously. Once an object blocks the light emitted by the light curtain, the system will immediately sense it and pause the pressing action of the hydraulic cylinder 40 to avoid danger.

[0037] In summary, by utilizing the elastic reset member 33 and the support block 32 slidably connected to the stamping base 10, the support block 32 can be moved away from the pressure block 22 in the initial state. The operator can directly place the cutter cylinder 1 onto the pressure block 22 for positioning. After the cutter cylinder 1 to be pressed is placed, the hydraulic cylinder 40 drives the support block 32 to align with the lower part of the front end of the pressure block 22 before pressing. It utilizes the guiding drive of the inclined surface 54 and the transition of the straight surface 55 to support the front end of the pressure block 22 before pressing. The whole process is carried out in an orderly manner, and the operator only needs to pick up and put down the cutter cylinder 1 and start the hydraulic cylinder 40. This improves the convenience of the operator's operation. Compared with the prior art, it can prevent the operator from forgetting to support the front end of the pressure block 22, resulting in insufficient support force on the pressure block 22 during the pressing operation, thereby preventing the pressing efficiency from decreasing and the life of the pressure block 22 from being reduced due to improper operation.

[0038] Please see Figure 2 , Figure 8 and Figure 10 The pressure block 22 has a folded edge receiving groove 23, and a knife cylinder positioning abutment strip 24 is provided at the front end of the folded edge receiving groove 23. The folded edges at both ends of the knife cylinder 1 overlap, and its thickness increases relative to the thickness of other parts of the knife cylinder 1 after pressing. By utilizing this feature, the folded edge receiving groove 23 can not only control the thickness of the folded edge position to be biased towards the inside of the knife cylinder 1 during the pressing process, but also position the knife cylinder 1 before pressing. Then, through the action of the knife cylinder positioning abutment strip 24, it is used to abut the front end of the folded edge position of the knife cylinder 1, so that the knife cylinder 1 can be prevented from sliding forward after it is placed, thus providing sufficient positioning for the knife cylinder 1, so that the lower pressure block 52 can be accurately pressed into the folded edge position of the knife cylinder 1 to press and fasten the folded edge. Based on this, a protruding first pre-pressure strip 25 is movably connected to one side of the bearing block 22 corresponding to the folded edge receiving groove 23. A first spring member 26 for driving the protrusion is provided between the first pre-pressure strip 25 and the bearing block 22. A protruding second pre-pressure strip 27 is movably connected to the lower pressing block 52 at the position corresponding to the other side of the receiving groove 23. A second spring member 28 for driving the protrusion is provided between the second pre-pressure strip 27 and the lower pressing block 52. When the folded edge is about to be pressed, the first pre-pressure strip 25 and the second pre-pressure strip 27 abut against the side of the blade cylinder 1 located at the folded edge, so that the blade cylinder 1 can be pre-pressed during the pressing stage, thereby ensuring the stability of the blade cylinder 1 and preventing it from shifting during the pressing and folding process.

[0039] Please see Figure 3 , Figure 4 and Figure 6The upper end of the pressure block 22 has an arc surface that fits the inner wall of the cutter cylinder 1, and the lower end face of the lower pressure block 52 is adapted to the arc surface. The arc surface plays a positioning role for the cutter cylinder 1. Only the upper end of the pressure block 22 is set as an arc surface, which can accommodate cutter cylinders 1 of different sizes and can meet the pressing operation of cutter cylinders 1 of various sizes within a certain range. The lower end of the pressure block 22 has a flat surface that abuts against the support block 32, and a chamfered surface is provided on the starting edge of the flat surface that abuts against the support block 32 to ensure full contact between the support block 32 and the pressure block 22.

[0040] Please see Figure 1 The stamping base 10 includes a base plate 11, a support column 12 vertically mounted at the rear end of the base plate 11, and a top plate 13 mounted on the support column 12 and directly above the base plate 11. The fixed seat 21 and the slide groove 31 are both set on the base plate 11, and the hydraulic rod is mounted on the top plate 13. The slide groove 31 has a dovetail structure and runs through both sides of the base plate 11. The lower end of the support block 32 is provided with a dovetail slider 321 adapted to the slide groove 31. This structure is simple and compact and can ensure the stable sliding of the support block 32 on the base plate 11. There are two support blocks 32 and two push blocks 53. The two support blocks 32 and the two push blocks 53 are symmetrically arranged with respect to the pressure block 22. The elastic reset member 33 is arranged between the two support blocks 32, so that the overall structure is subjected to symmetrical and uniform force.

[0041] Please see Figure 5 The elastic reset component 33 includes a support seat 331 installed in the middle of the slide groove 31, a connecting rod 332 connected to the support seat 331 and with its two ends respectively abutting against two support blocks 32, and a reset spring 333 sleeved on the connecting rod 332 and abutting between the support seat 331 and the support blocks 32. A clearance groove 322 is provided at one end of the support block 32 that abuts the connecting rod 332 so that the support seat 331 and the reset spring 333 in a further compressed state can be accommodated between the two support blocks 32 after they are abutted. A limiting hole 323 is provided at the inner side of the support block 32 located in the clearance groove 322. The end of the connecting rod 332 is restricted in the limiting hole 323 to limit the stroke of the support block 32 being pushed open by the reset spring 333. This structure is simple and compact, and cleverly utilizes the cooperation between the connecting rod 332 and the support block 32 to connect and install the reset spring 333. It can also use the connecting rod 332 to limit the stroke of the support block 32.

[0042] Please see Figure 3 , Figure 4 and Figure 6 A guide rod 56 is connected to the lower pressure plate 51, and a linear bearing adapted to the guide rod 56 is provided on the top plate 13. The lower pressure plate 51 and the top plate 13 are guided and coordinated through the connection of the linear bearing and the guide rod 56, so that the lower pressure plate 51 can move stably up and down.

[0043] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. An improved blade cartridge press-fit jig, characterized by, The utility model provides a stamping base (10) is included, integratedly provided with pressure bearing part (20), support part (30), hydraulic cylinder (40) and lower pressure part (50) on stamping base (10), pressure bearing part (20) includes fixed seat (21) installed on stamping base (10) and pressure bearing block (22) installed before fixed seat (21), pressure bearing block (22) is used for setting knife cylinder (1), and the end of knife cylinder (1) is positioned on pressure bearing block (22), support part (30) includes chute (31) set up on stamping base (10), support block (32) slidingly connected to chute (31) and elastic reset member (33) set up on stamping base (10) and with support block (32) elastic butt joint, support block (32) is supported to the front end of pressure bearing block (22) by overcoming the elastic force of elastic reset member (33) and sliding along chute (31) to the lower position of the front end of pressure bearing block (22);Hydraulic cylinder (40) is set down above pressure bearing part (20) and support part (30) through stamping base (10), lower pressure part (50) includes lower pressure plate (51) connected on the piston end of hydraulic cylinder (40), lower pressure block (52) fixedly connected to lower pressure plate (51) and right above pressure bearing block (22) and push block (53) fixedly connected to lower pressure plate (51) and right above support block (32), the inclined plane (54) of butt joint cooperation is set up on support block (32) and push block (53), and push block (53) is guided to push support block (32) to butt joint in pressure bearing block (22) through inclined plane (54);The straight surface (55) of butt joint cooperation is set up on support block (32) and push block (53), and push block (53) makes support block (32) complete knife cylinder (1) pressing operation in the state of keeping still through the sliding cooperation of straight surface (55);Safety grating (60) is also set up at the both sides of the front end of stamping base (10).

2. The improved knife barrel compression jig according to claim 1, wherein, The folding edge accommodating groove (23) is formed in the pressure bearing block (22), and the front end of the folding edge accommodating groove (23) is provided with a knife cylinder positioning resisting strip (24).

3. The improved knife barrel compression jig of claim 2, wherein, The first pre-pressing strip (25) is movably connected to one side of the pressure bearing block (22) corresponding to the folding edge accommodating groove (23) and can protrude, and the first spring member (26) for driving the first pre-pressing strip (25) to protrude is arranged between the first pre-pressing strip (25) and the pressure bearing block (22), and the second pre-pressing strip (27) is movably connected to the position of the lower pressure block (52) corresponding to the other side of the folding edge accommodating groove (23) and can protrude, and the second spring member (28) for driving the second pre-pressing strip (27) to protrude is arranged between the second pre-pressing strip (27) and the lower pressure block (52).

4. The improved knife barrel compression jig of claim 1, wherein, The upper end of the pressure bearing block (22) has a circular arc surface matched with the inner wall of the knife cylinder (1), the lower end surface of the lower pressure block (52) is matched with the circular arc surface, the lower end of the pressure bearing block (22) has a flat surface butted against the support block (32), and a chamfered surface is arranged at the starting edge of the flat surface butting against the support block (32).

5. The improved knife barrel press-fit jig according to any one of claims 1-4, wherein, The stamping base (10) comprises a bottom plate (11), a support column (12) vertically installed at the rear end of the bottom plate (11), and a top plate (13) installed on the support column (12) and vertically above the bottom plate (11), a fixing base (21) and a sliding groove (31) are arranged on the bottom plate (11), and a hydraulic rod is installed on the top plate (13).

6. The improved knife barrel compression jig of claim 5, wherein, The sliding groove (31) is in dovetail type structure and penetrates through both sides of the bottom plate (11), and the lower end of the support block (32) is provided with a dovetail type sliding block (321) matched with the sliding groove (31).

7. The improved knife barrel compression jig of claim 5, wherein, The support block (32) and the pushing block (53) are both provided with two, the two support blocks (32) and the two pushing blocks (53) are symmetrically arranged relative to the pressure bearing block (22), and the elastic return member (33) is arranged between the two support blocks (32).

8. The improved knife barrel compression jig of claim 5, wherein, The elastic return member (33) comprises a support seat (331) installed in the middle of the sliding groove (31), a connecting rod (332) connected to the support seat (331) and abutting to the two support blocks (32) at both ends, and a reset spring (333) sleeved on the connecting rod (332) and abutting between the support seat (331) and the support block (32), a gap slot (322) is arranged at one end of the support block (32) abutting to the connecting rod (332), so that the two support blocks (32) can accommodate the support seat (331) and the reset spring (333) in the further compressed state after abutting to each other; a limiting hole (323) is formed at the inner side position of the gap slot (322) of the support block (32), and the end of the connecting rod (332) is limited in the limiting hole (323) to limit the stroke of the support block (32) being bounced open by the reset spring (333).

9. The improved knife barrel compression jig of claim 7, wherein, The lower pressing plate (51) is connected with a guide rod (56), the top plate (13) is provided with a linear bearing matched with the guide rod (56), and the lower pressing plate (51) and the top plate (13) are guided and matched through the connection of the linear bearing and the guide rod (56).

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