Die for punching circular cover
By designing a mold for punching circular covers, the problem of low loading and unloading efficiency of parts in the prior art is solved, and the sustainability and production efficiency of punching parts are improved.
Patent Information
- Application Number
- CN202421407787.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-19
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-06-19
AI Technical Summary
In the prior art, when punching metal parts, it is difficult to efficiently load and unload parts, resulting in low production efficiency.
A mold for punching a circular cover is designed, including a die frame, a stamping upper die, a stamping lower die, a feeding assembly and a push assembly. The parts to be punched are sent to the pushing assembly through the feeding assembly, the pushing plate is pushed by the driving cylinder, and the parts are sent to the stamping and depressing mold, and the parts are synchronized in the loading and unloading process of the parts.
The sustainability of parts punching production is achieved, the production efficiency of parts punching processing is improved, the number of defective products caused by deviation of punching position is reduced, and the cost is reduced.
Smart Images
Figure CN222642995U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of stamping die technology, and in particular to a die for punching holes in round covers. Background Art
[0002] Stamping die is a tool widely used in metal parts processing. Its working principle is to deform and cut metal materials through the coordinated cooperation of stamping equipment, stamping tools and other components.
[0003] Refer to the attached Figure 4 There is a metal part whose front view and top view are rectangular and circular respectively. It is necessary to make a hole along the geometric center of the part. The optional scheme is: by formulating a special hole-making jig, and using a lathe or a drilling tool to make a hole with a drill. The appearance and size of the parts produced in this way can meet the design requirements, but because of its thin thickness and small size, it is not convenient to clamp, so it is not convenient to send the part to be made into the hole-making jig.
[0004] Another option is to make a special stamping die and realize the part hole processing through the coordinated cooperation of the stamping upper die, the punch and the stamping lower die. The traditional stamping die only has the functions of stamping or trimming, and does not have the loading and unloading process of the parts. It has a single function and needs further improvement. Utility Model Content
[0005] In order to ensure the sustainability of part punching production, the present application provides a die for punching circular covers.
[0006] The present application provides a die for punching a circular cover using the following technical solution:
[0007] A die for punching holes in round covers comprises a die frame, a stamping upper die and a stamping lower die arranged on the die frame, the stamping upper die and the stamping lower die cooperate to punch holes in parts on the stamping lower die; a feeding assembly and a pushing assembly arranged on the die frame, the feeding assembly being used to feed the parts to be punched to the pushing assembly; the pushing assembly comprises a driving cylinder and a pushing plate, the driving cylinder being arranged on the die frame, the piston rod of the driving cylinder facing the stamping lower die, the pushing plate being fixedly connected to the piston rod of the driving cylinder; when the piston rod of the driving cylinder pushes the pushing plate out, the parts located at the front end of the pushing plate follow the pushing plate to move toward the stamping lower die.
[0008] By adopting the above technical solution, after the feeding assembly sends the part to be punched to the push plate, the piston rod of the driving cylinder drives the push plate to move toward the stamping lower die, so that the part located at the front end of the push plate moves synchronously with the push plate to the stamping lower die. At this time, the stamping lower die and the stamping upper die cooperate to punch the part. When the punching is completed, the piston rod of the driving cylinder pushes the push plate again to carry the part to the stamping lower die. The part to be punched pushes the punched part along the stamping lower die to realize the unloading operation, thereby making the part punching production sustainable and improving the production efficiency of the part punching processing to a certain extent.
[0009] Preferably, a limiting groove is provided on the mold frame, one end of the limiting groove faces the stamping lower mold, and the other end of the limiting groove faces the push plate, and the push plate is slidably disposed in the limiting groove.
[0010] By adopting the above technical solution, the limiting effect of the limiting groove reduces the swing of the push plate when it moves toward the stamping lower die, and to a certain extent improves the accuracy of the push plate in pushing the parts to be punched to the position of the stamping lower die, thereby reducing the number of parts whose punching position deviates due to the fact that the geometric center of the stamping upper die and the parts are not on the same axis, which has a positive guiding effect on improving the punching production efficiency of parts.
[0011] Preferably, the push plate includes a positioning plate and a pushing plate, the positioning plate and the pushing plate are installed on the upper surface of the pushing plate in the same direction, the pushing plate is fixedly connected to the piston rod of the driving cylinder, when the piston rod of the driving cylinder pushes the pushing plate and the positioning plate to move toward the stamping lower die, the parts located under the positioning plate follow the push plate and move synchronously along the limiting groove.
[0012] By adopting the above technical solution, when the driving cylinder drives the push plate to move toward the stamping lower die, the part is under the positioning plate. The positioning plate limits the part in the vertical direction, thereby reducing the resistance encountered when the part slides along the limiting groove, causing the part to pop out along the sliding groove, thereby reducing the number of empty operations of the stamping upper die.
[0013] Preferably, the depth of the part placement area of the stamping lower die is less than the thickness of the part, and the edge of the part placement area of the stamping lower die is chamfered.
[0014] By adopting the above technical scheme, when the part is pushed by the pushing plate to the stamping lower die, it can just fall into the part placement area of the stamping lower die. Because the depth of the part placement area is less than the thickness of the part, part of the part is located outside the part placement area at this time. After the stamping upper die completes the punching process on the part, the pushing plate pushes the part toward the stamping lower die again. When the part to be punched abuts against the part after punching, the edge of the part placement area is chamfered, so the punched part is pushed out along the part placement area. The above process realizes the simultaneous loading and unloading of parts, and there is no need to additionally assemble mechanical devices for loading and unloading parts, which reduces the cost to a certain extent.
[0015] Preferably, the stamping upper die is provided with a booster rod deviating from the geometric center, and the booster rod is slidably arranged on the stamping upper die along the vertical direction; when the stamping lower die abuts against the stamping upper die, the booster rod is flush with the lower surface of the stamping upper die.
[0016] By adopting the above technical solution, when the stamping upper die completes punching of the part placed on the stamping lower die, the punched part may be stuck on the punching upper die. The part stuck in the punching upper die can be pushed out through the thrust of the booster rod, which to a certain extent solves the problem of disorder in the subsequent punching process due to the inability to separate the punched part from the stamping upper die.
[0017] Preferably, the feeding assembly includes a feeding guide rail, the end of which is arranged perpendicularly to the limiting groove, and the width of the feeding guide rail is greater than the diameter of the part.
[0018] By adopting the above technical solution, the parts can be moved to the limiting groove along the feeding guide rail through the limiting effect of the feeding guide rail, thereby reducing the occurrence of more than one part being fed to the limiting groove along the feeding guide rail at the same time.
[0019] Preferably, the feeding guide rail is provided with a plurality of ball bearings along its two side walls.
[0020] By adopting the above technical solution, when the part to be punched moves along the feeding guide rail, the rolling cooperation of a plurality of balls reduces the resistance encountered by the part to be punched when sliding along the feeding guide rail, so that the part to be punched can slide smoothly along the feeding guide rail to the sliding groove.
[0021] Preferably, an adjustment plate is provided on the mold frame, the adjustment plate is threadedly fixed on the mold frame, and the driving cylinder is provided on the adjustment plate.
[0022] By adopting the above technical solution, since the piston rod stroke of the driving cylinder is limited, as the number of times the driving cylinder works increases, the stroke may be insufficient or too long, resulting in the piston rod of the driving cylinder pushing the push plate to carry the parts to be punched and unable to accurately deliver them to the part placement area of the stamping lower die. Through the adjustment function of the adjustment plate, the position of the driving cylinder can be adjusted in time, so that the parts to be punched can be relatively accurately delivered to the part placement area of the stamping lower die.
[0023] In summary, the present application includes at least one of the following beneficial technical effects:
[0024] 1. The parts to be punched are sent to the pusher assembly through the feeding assembly, and the piston rod of the driving cylinder is extended and retracted to push the parts to be punched toward the stamping lower die. When the stamping upper die and the stamping lower die cooperate to punch the parts, the piston rod of the driving cylinder pushes the parts to be punched toward the stamping lower die again, so that the parts to be punched push the parts on the stamping lower die that have been punched out, realizing the continuous loading and unloading of parts;
[0025] 2. The positioning function of the positioning plate reduces the probability of parts popping out along the sliding groove when they encounter resistance when sliding along the sliding groove;
[0026] 3. The completed stamped parts stuck on the stamping upper die are pushed out by the booster rod, which to a certain extent solves the problem of the number of defective products caused by the parts after punching being stuck on the stamping upper die and the stamping upper die punching the parts placed on the stamping lower die again, which has a positive guiding effect on improving the production efficiency of parts. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a schematic diagram of the overall structure of a mold used for punching a circular cover in an embodiment of the present application.
[0028] Figure 2 yes Figure 1 Enlarged schematic diagram of part A.
[0029] Figure 3 yes Figure 2 Schematic diagram of the enlarged portion B.
[0030] Figure 4 It is a structural diagram of the parts required for punching in the embodiment of the present application.
[0031] Explanation of the reference numerals in the accompanying drawings: 1. mold frame; 11. adjustment plate; 111. adjustment slot; 12. stamping frame; 13. support frame; 131. support plate; 2. stamping upper mold; 3. stamping lower mold; 4. feeding assembly; 41. feeding guide rail; 411. ball bearing; 42. vibrating feeding plate; 5. pushing assembly; 51. driving cylinder; 52. pushing plate; 521. positioning plate; 522. pushing plate; 6. limiting slot; 7. booster rod; 8. guide assembly; 81. guide slider; 82. guide shaft; 83. connecting block. DETAILED DESCRIPTION
[0032] Directions such as up, down, left, right, front, back, side, above, and below mentioned or may be mentioned in this specification are defined relative to the structures shown in the accompanying drawings. The words "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively. They are relative concepts and may therefore change accordingly depending on their different positions and different usage states. Therefore, these or other directions should not be interpreted as restrictive terms.
[0033] The following is combined with Figure 1-3 This application is described in further detail.
[0034] The present application embodiment discloses a die for punching a circular cover. Figures 1 to 3 A die for punching holes in a circular cover comprises a die frame 1, a stamping upper die 2 and a stamping lower die 3 arranged on the die frame 1, and the stamping upper die 2 and the stamping lower die 3 cooperate to punch holes on the parts on the stamping lower die 3. A feeding assembly 4 and a pushing assembly 5 are arranged on the die frame 1, and the feeding assembly 4 is used to send the parts to be punched to the pushing assembly 5; the pushing assembly 5 comprises a driving cylinder 51 and a pushing plate 52, the driving cylinder 51 is arranged on the die frame 1, the piston rod of the driving cylinder 51 faces the stamping lower die 3, and the pushing plate 52 is fixedly connected to the piston rod of the driving cylinder 51; when the piston rod of the driving cylinder 51 pushes the pushing plate 52 out, the parts located at the front end of the pushing plate 52 follow the pushing plate 52 to move toward the stamping lower die 3.
[0035] Specifically, the mold frame 1 includes a stamping frame 12 and a supporting frame 13. The stamping frame 12 is equipped with a stamping device. The stamping device is a conventional stamping power device, which is composed of components such as a hydraulic cylinder. The stamping process is powered by controlling the extension and retraction of the hydraulic cylinder piston rod. The specific composition and working principle will not be described in detail here.
[0036] Furthermore, a bearing plate 131 is installed on the bearing frame 13, and the outer contour of the bearing plate 131 is set in a rectangular shape. The stamping lower die 3 is installed on the bearing plate 131, and the stamping lower die 3 is opposite to the stamping upper die 2. When the piston rod of the hydraulic cylinder is extended and retracted in the vertical direction, the stamping upper die 2 moves synchronously with the piston rod of the hydraulic cylinder, and the diameter of the stamping upper die 2 is the same as the required hole diameter of the part.
[0037] Therefore, the feeding assembly 4 sends the parts to be punched to the pushing assembly 5, and the pushing assembly 5 sends the parts to be punched to the stamping upper die 2. When the stamping upper die 2 abuts against the stamping lower die 3, the parts to be punched placed on the stamping lower die 3 are punched.
[0038] Reference Figure 2 and Figure 3 A limiting groove 6 is provided on the mold frame 1 , one end of the limiting groove 6 faces the stamping lower mold 3 , and the other end of the limiting groove 6 faces the push plate 52 , and the push plate 52 is slidably disposed in the limiting groove 6 .
[0039] Specifically, the limiting groove 6 is opened along the length direction of the bearing plate 131 , the width of the limiting groove 6 is greater than the width of the push plate 52 , and the stamping lower die 3 is installed at the end of the limiting groove 6 along the length direction of the limiting groove 6 .
[0040] Therefore, the push plate 52 moves synchronously with the piston rod of the driving cylinder 51. When the piston rod of the driving cylinder 51 extends, the push plate 52 pushes the part to be punched to the punching lower die. When the stamping upper die 2 cooperates with the stamping lower die 3 to complete the stamping of the part, the piston rod of the driving cylinder 51 extends again, so that the push plate 52 pushes the part to be punched along the limiting groove 6 to the stamping lower die 3 again. When the part to be punched abuts against the part that has been punched, the part to be punched pushes the punched part out along the stamping lower die 3, thereby realizing the unloading process of the part that has been punched.
[0041] At the same time, in order to be able to push the punched parts out along the stamping lower die 3 more smoothly, the edges of the part placement area of the stamping lower die 3 are chamfered, and the depth of the part placement area of the stamping lower die 3 is less than the thickness of the part. When the push plate 52 pushes the part to be punched to abut against the punched part, because the part placement area of the stamping lower die 3 is provided with rounded corners and part of the part is located outside the placement area, the part after punching can be smoothly moved out along the stamping lower die 3, which to a certain extent reduces the resistance of the part to be punched when pushing the punched part to be pushed out along the stamping lower die 3. When the part to be punched pushes the punched part to be pushed out along the stamping lower die 3, the punched part falls along the sliding groove onto the carrier 13, and the part to be punched is located on the part placement area of the stamping lower die 3, realizing the loading and unloading process of the part.
[0042] Reference Figure 2 and Figure 3The push plate 52 includes a positioning plate 521 and a pushing plate 522. The positioning plate 521 and the pushing plate 522 are installed in the same direction on the upper surface of the pushing plate 522. The pushing plate 522 is fixedly connected to the piston rod of the driving cylinder 51. When the piston rod of the driving cylinder 51 pushes the pushing plate 522 and the positioning plate 521 to move toward the stamping lower die 3, the parts located under the positioning plate 521 follow the pushing plate 522 to move synchronously along the limiting groove 6.
[0043] Specifically, an adjustment plate 11 is installed on the carrier frame 13, and the outer contour of the adjustment plate 11 is set in a rectangular shape. The adjustment plate 11 is provided with adjustment grooves 111 at the corners along the upper surface thereof. The adjustment plate 11 is installed on the carrier frame 13 along the adjustment grooves 111 by bolts. The adjustment plate 11 is installed on one side of the stamping lower die 3 along the width direction of the carrier frame 13. The driving cylinder 51 is installed on the adjustment plate 11. When it is necessary to adjust the distance between the driving cylinder 51 and the stamping lower die 3, the bolts can be loosened to adjust the driving cylinder 51 along the width direction of the carrier frame 13, so that when the piston rod of the driving cylinder 51 carries the push plate 522 to push the part to be punched to move along the limit groove 6, the part can be accurately delivered to the part placement area of the stamping lower die 3.
[0044] Furthermore, in order to improve the stability of the driving cylinder 51 when pushing the push plate 52 to move toward the stamping lower die 3, a guide assembly 8 is arranged on the adjustment plate 11, and the guide assembly 8 includes a guide slider 81, a guide shaft 82 and a connecting block 83. There are two guide sliders 81, and there are two guide shafts 82. The two guide sliders 81 are installed on both sides of the driving cylinder 51, and the two guide shafts 82 are respectively slidably arranged in the two guide sliders 81. At the same time, the external contour of the connecting block 83 is arranged in a rectangular shape. The connecting block 83 is vertically fixed to the piston rod of the driving cylinder 51 and the two guide shafts 82. When the piston rod of the driving cylinder 51 is extended, the two guide shafts 82 slide synchronously with the piston rod of the driving cylinder 51.
[0045] At the same time, the external contours of the pushing plate 522 and the positioning plate 521 are set in a rectangular shape, one end of the pushing plate 522 is vertically fixed to the connecting block 83, and the positioning plate 521 is fixed to the upper surface of the pushing plate 522 by bolts. At this time, the positioning plate 521 extends outward along the length direction of the pushing plate 522, and the distance between the lower surface of the positioning plate 521 and the upper surface of the limiting groove 6 is greater than the thickness of the metal part. Therefore, when the pushing plate 522 pushes the part to be punched to slide along the limiting groove 6, the part to be punched is always below the positioning plate 521.
[0046] Therefore, through the positioning effect of the positioning plate 521, the parts to be punched can slide smoothly along the limiting groove 6 to the stamping lower die 3, which to a certain extent reduces the occurrence of the part popping out along the limiting groove 6 due to excessive resistance encountered by the part when the part slides synchronously along the limiting groove 6 following the push plate 522.
[0047] Reference Figure 2 The stamping upper die 2 is provided with a booster rod 7 deviating from the geometric center, and the booster rod 7 is slidably provided on the stamping upper die 2 along the vertical direction; when the stamping lower die 3 abuts against the stamping upper die 2, the booster rod 7 is flush with the lower surface of the stamping upper die 2.
[0048] Specifically, the outer contour of the booster rod 7 is set in a cylindrical shape, and the booster rod 7 is slidably installed on the lower surface of the stamping upper die 2 along the vertical direction. The booster rod 7 faces the stamping lower die 3, and a return spring (not shown in the figure) is installed in the stamping upper die 2. When the booster rod 7 is slidably installed in the stamping upper die 2, one end of the booster rod 7 abuts against the end face of the spring.
[0049] The problem is that after the stamping upper die 2 and the stamping lower die 3 cooperate to stamp the part placed on the stamping lower die 3, the part may be stuck in the stamping upper die 2, causing the part to rise synchronously with the stamping upper die 2. Therefore, through the coordinated cooperation of the reset spring and the booster rod 7, when the stamping upper die 2 is separated from the stamping lower die 3, due to the action of the reset spring elastic force, the booster rod 7 is pushed out along the stamping upper die 2, thereby pushing the part stuck on the stamping upper die 2 to separate from the stamping upper die 2.
[0050] Therefore, through the coordinated cooperation of the return spring and the booster rod 7, the probability of the stamped parts being stuck in the stamping upper die 2, when the stamping upper die 2 punches the parts placed on the stamping lower die 3 again, the punched parts are punched again, resulting in defective parts, or the upper die 2 or the stamping lower die 3 being damaged due to excessive stamping, is reduced.
[0051] Reference Figure 1 and Figure 2 The feeding assembly 4 includes a feeding guide rail 41 and a vibrating feeding plate 42. The end of the feeding guide rail 41 is vertically arranged with the limiting groove 6. The width of the feeding guide rail 41 is greater than the diameter of the part. The feeding guide rail 41 is installed with a plurality of balls 411 along its two side walls.
[0052] Specifically, the vibrating feed tray 42 is a device for automatic feeding and directional conveying of materials. It conveys parts to the feed guide rail 41 in a certain direction and speed by vibration. It is a prior art, and its specific composition and working principle will not be described in detail here.
[0053] One end of the feeding guide rail 41 is connected to the discharge end of the vibrating feeding plate 42 , and the other end of the feeding guide rail 41 is perpendicularly arranged on the limiting groove 6 on the supporting frame 13 on one side of the limiting groove 6 .
[0054] Correspondingly, in order to improve the smoothness and stability of the parts when they are transported along the feeding guide rail 41, a number of ball bearings 411 installed on both sides of the feeding guide rail 41 play a role in reducing the friction between the parts and the side walls of the feeding guide rail 41 when they are transported along the feeding guide rail 41, thereby reducing the resistance encountered by the parts during the process of being transported along the feeding guide rail 41 to the limiting groove 6 located at the front end of the push plate 522.
[0055] It should be noted that the “several” mentioned is a quantitative term to indicate the number of balls 411 . However, since their number is relatively large and they are all used to reduce the resistance encountered by parts during transportation along the feeding guide rail 41 , the specific number is expressed as “several”.
[0056] The implementation principle of a mold for punching a circular cover in the embodiment of the present application is as follows: the part to be punched slides along the feeding guide rail 41 to the limiting groove 6 at the front end of the push plate 522. At this time, the piston rod of the driving cylinder 51 extends to push the push plate 522 fixedly mounted thereto to slide along the limiting groove 6. The part located at the front end of the push plate 522 follows the push plate 522 and slides synchronously along the limiting groove 6 to the part placement area of the stamping lower die 3. Then, the piston rod of the driving cylinder 51 pulls the push plate 522 to slide along the limiting groove 6 to the initial position. At this time, the stamping upper die 2 and the stamping lower die 3 cooperate to stamp the part placed on the stamping lower die 3. When the stamping is completed, After completion, the piston rod of the hydraulic cylinder pulls the stamping upper die 2 up, and then drives the piston rod of the cylinder 51 to push the push plate 522 again, so that the push plate 522 pushes the part located in the limiting groove 6 at its front end to move toward the stamping lower die 3. When the part to be punched abuts against the part completed by stamping, with the help of the thrust provided by the driving cylinder 51, the part to be punched pushes the completed part along the stamping lower die 3 to the carrier 13. At this time, the part to be punched is just located in the part placement area of the stamping lower die 3. Repeating the above steps can realize the sustainable punching process of the parts, which improves the production efficiency of the part punching process to a certain extent.
[0057] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A die for punching a circular cover, characterized in that: The invention comprises a die frame (1), a stamping upper die (2) and a stamping lower die (3) arranged on the die frame (1), wherein the stamping upper die (2) and the stamping lower die (3) cooperate to punch holes on parts on the stamping lower die (3); a feeding assembly (4) and a pushing assembly (5) arranged on the die frame (1), wherein the feeding assembly (4) is used to feed the parts to be punched to the pushing assembly (5); the pushing assembly (5) comprises a driving cylinder (51) and a A push plate (52), the driving cylinder (51) is arranged on the die frame (1), the piston rod of the driving cylinder (51) faces the stamping lower die (3), and the push plate (52) is fixedly connected to the piston rod of the driving cylinder (51); when the piston rod of the driving cylinder (51) pushes the push plate (52), the parts located at the front end of the push plate (52) follow the push plate (52) to move toward the stamping lower die (3).
2. A die for punching a circular cover according to claim 1, characterized in that: A limiting groove (6) is provided on the die frame (1), one end of the limiting groove (6) faces the stamping lower die (3), and the other end of the limiting groove (6) faces the push plate (52), and the push plate (52) is slidably disposed in the limiting groove (6).
3. A die for punching a circular cover according to claim 2, characterized in that: The push plate (52) includes a positioning plate (521) and a pushing plate (522); the positioning plate (521) and the pushing plate (522) are installed on the upper surface of the pushing plate (522) in the same direction; the pushing plate (522) is fixedly connected to the piston rod of the driving cylinder (51); when the piston rod of the driving cylinder (51) pushes the pushing plate (522) and the positioning plate (521) to move toward the stamping lower die (3), the parts located below the positioning plate (521) follow the pushing plate (522) and move synchronously along the limiting groove (6).
4. A die for punching a circular cover according to claim 1, characterized in that: The depth of the part placement area of the stamping lower die (3) is less than the thickness of the part, and the edge of the part placement area of the stamping lower die (3) is chamfered.
5. A die for punching a circular cover according to claim 1, characterized in that: The stamping upper die (2) is provided with a booster rod (7) deviating from the geometric center, and the booster rod (7) is slidably arranged on the stamping upper die (2) along the vertical direction; when the stamping lower die (3) abuts against the stamping upper die (2), the booster rod (7) is flush with the lower surface of the stamping upper die (2).
6. A die for punching a circular cover according to claim 2, characterized in that: The feeding assembly (4) comprises a feeding guide rail (41), the end of the feeding guide rail (41) is arranged perpendicular to the limiting groove (6), and the width of the feeding guide rail (41) is greater than the diameter of the part.
7. A die for punching a circular cover according to claim 6, characterized in that: The feeding guide rail (41) is provided with a plurality of rolling balls (411) along its two side walls.
8. The die for punching a circular cover according to claim 1, characterized in that: The mold frame (1) is provided with an adjustment plate (11), the adjustment plate (11) is threadedly fixed to the mold frame (1), and the driving cylinder (51) is arranged on the adjustment plate (11).