Stamping die for screw production

Abstract

The invention provides a stamping die for screw production, and relates to the technical field of stamping dies. The stamping die for screw production comprises a stamping seat and a base, a through hole is formed in the position, close to the lower end, of the front end face of the stamping seat, a second die seat is embedded in the through hole, an inner disc is rotationally arranged at the middle point of the interior of the stamping seat and comprises a top disc, and a connecting disc is fixedly arranged at the lower end of the top disc; a semicircular disc is fixedly arranged on the rear side of the lower end of the connecting disc, the interiors of the top disc, the connecting disc and the semicircular disc are communicated to form a containing cavity, a pushing plate is embedded in the top end face in the containing cavity, a plurality of connecting springs are arranged at the lower end of the pushing plate, and limiting bases are fixedly arranged at the ends, away from the pushing plate, of the connecting springs. By means of the die, two sets of screws can be stamped at the same time, the operation steps of die taking and die placing after one screw is stamped at a time are not needed, the stamping procedure is accelerated, and the effect of saving time and labor is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of stamping dies, in particular to a stamping die for producing screws. Background Art

[0002] The traditional stamping die for stamping screws includes a lower die and an upper die. The upper end face of the lower die is provided with a blind hole that matches the shape of the screw, i.e., the lower die cavity. The lower end face of the upper die is provided with a cylindrical pit, and the top of the pit is provided with a hexagonal prism protrusion. The cavity between the cylindrical pit and the hexagonal prism protrusion constitutes an upper die cavity that matches the shape of the head of the hexagon socket screw. The center lines of the upper and lower cavities coincide. The lower die is fixed, and a round rod is placed in the lower die cavity. The length of the round rod is greater than the height of the lower die cavity. The upper die is fixed with the punch. The punch is driven to close the two dies, and the round rod can be stamped into a hexagon socket screw.

[0003] The stamping dies of the prior art have the following defects: each time a screw is stamped and formed, five steps of mold opening, loading, stamping and closing the mold, re-opening the mold, and demolding need to be performed separately. The number of times the number of screws to be stamped requires repeated operations, which is slow and inefficient, and cannot be stamped and formed continuously; secondly, since the round rod is put in between the upper mold and the lower mold when discharging the material, before discharging the material and when opening the mold, if the mold opening amplitude is too small and the distance between the two molds is insufficient, it is difficult for people to put the round rod in; but if the mold opening amplitude is too large, the stroke of the punch when opening and closing the mold will be increased, which will consume more time and further reduce efficiency. Moreover, there is a certain risk in discharging the material between the two molds. If the punch is accidentally started, it may injure people's hands. Summary of the invention

[0004] (I) Technical solution

[0005] In order to solve the above technical defects, the present invention is implemented through the following technical solutions: a stamping die for screw production, comprising a stamping seat and a base, a through hole is opened at the lower end of the front end surface of the stamping seat, a No. 2 die seat is embedded in the through hole, an inner disk is rotatably arranged at the midpoint of the inside of the stamping seat, the inner disk comprises a top disk, a connecting disk is fixedly arranged at the lower end of the top disk, a semi-circular disk is fixedly arranged at the rear side of the lower end of the connecting disk, the top disk, the connecting disk and the semi-circular disk are connected to form a placement cavity, a push plate is embedded in the top end surface of the placement cavity, a plurality of connecting springs are arranged at the lower end of the push plate, and a limiting seat is fixedly arranged at the end of the connecting spring away from the push plate;

[0006] A rotating shaft is rotatably provided on the upper end surface of the top plate, and the end of the rotating shaft away from the top plate is rotatably provided in the stamping seat, a threaded rod is threadedly sleeved on the inside of the rotating shaft, and the lower end of the threaded rod is rotatably sleeved on the upper end of the pushing plate, a worm gear is fixedly sleeved on the outer side of the rotating shaft, and a linkage worm connected to the worm gear is provided inside the stamping seat at the rear end of the worm gear, a No. 2 punching head is fixedly provided on one side of the upper end surface of the base, the No. 2 punching head includes a bottom block and a hexagonal punch, a No. 1 mold seat is rotatably provided inside the base, and a plurality of No. 1 tooth blocks are fixedly provided on the outer wall of the No. 1 mold seat near the lower end, the upper end of the No. 1 mold seat passes through the base, and a plurality of screw mold holes are circumferentially arranged at equal intervals on the outer periphery of the upper end surface.

[0007] Preferably, guide rods are fixedly provided at the front and rear ends on both sides of the upper end surface of the base, a mounting plate is fixedly provided on the upper end surface of the guide rod and a hydraulic push rod is fixedly provided at the midpoint of the upper end surface of the mounting plate, the stamping seat is slidably sleeved on the four guide rods and the upper surface is fixedly connected to the output end of the hydraulic push rod.

[0008] Preferably, a No. 1 servo motor is fixedly arranged on one side of the upper end surface of the stamping seat and a No. 2 gear is fixedly arranged on the output end of the No. 1 servo motor, and a plurality of No. 2 gear blocks are evenly spaced around the outer wall of the top plate and mesh with the No. 2 gear.

[0009] Preferably, the No. 2 mold seat includes an upper plate, a lower plate is fixedly provided at the lower end of the upper plate, a plurality of placement holes are evenly spaced around the upper end surface of the upper plate, and slots are provided at the midpoints of both sides of the outer wall of the upper plate, and clamping blocks are fixedly provided on both sides of the lower end surface of the limiting seat, and the two clamping blocks are respectively embedded in the two clamping slots to complete the clamping and fixing of the No. 2 mold seat, so that it can achieve linkage.

[0010] Preferably, a No. 1 punch head is fixedly provided at the midpoint of the front side of the lower end surface of the punch seat, and the No. 1 punch head corresponds vertically to one of the multiple screw die holes on the upper end surface of the No. 1 die seat.

[0011] Preferably, a punching hole is opened at the midpoint of one side of the lower end surface of the punching seat, and the punching hole corresponds vertically to the hexagonal punch up and down. The hexagonal punch is fixedly arranged at the midpoint of the upper end of the bottom block and the bottom block is fixedly arranged at the upper end of the base.

[0012] Preferably, a No. 2 servo motor is embedded in one side of the base and a No. 1 gear is fixedly provided at the output end of the No. 2 servo motor, and the No. 1 gear is meshed with a plurality of No. 1 tooth blocks on the outer wall of the No. 1 mold seat.

[0013] Preferably, a second bevel gear is fixedly provided at one end of the linkage worm away from the worm wheel, a first bevel gear meshing with the second bevel gear is provided inside the stamping seat, and a torsion rod is fixedly provided inside the first bevel gear, a torsion block is fixedly provided at one end of the torsion rod away from the first bevel gear, and the torsion block is located on the upper surface of the stamping seat.

[0014] Working principle: When the stamping die is stamping, firstly, multiple prefabricated screw workpieces to be stamped are placed into multiple screw die holes on the upper end of the No. 1 die seat, and at the same time, multiple prefabricated screw workpieces to be stamped are placed in the placement holes in the No. 2 die seat, and the No. 2 die seat equipped with the prefabricated screw workpieces to be stamped is placed into the through hole of the stamping seat so that it is embedded in the inner disk. At this time, the torsion rod is driven to rotate by rotating the torsion block on the upper end of the stamping seat so that the No. 1 bevel gear at the lower end drives the No. 2 bevel gear to rotate, and the rotation of the No. 2 bevel gear causes the linkage worm to rotate, and the worm wheel rotates accordingly. At this time, the rotating shaft rotates to move the internal threaded rod downward and then squeeze the push plate to move it downward. The push plate pushes the connecting spring at the lower end and squeezes the limiting seat so that the clamping block at the lower end is embedded in the clamping groove at the upper end of the No. 2 die seat to complete the clamping and fixing connection;

[0015] At this time, one of the multiple placement holes on the No. 2 mold seat corresponds to the punching hole at the lower end. The hydraulic push rod is used to press down the entire punch seat to cause it to move downward for punching. The No. 1 punch head at the lower end of the punch seat punches and forms the prefabricated screw workpiece to be punched in the No. 1 mold seat. At the same time, during the punching process of the No. 1 punch head, the No. 2 punch head at the upper end of the base passes through the punching hole of the punch seat to synchronously punch and form the prefabricated screw workpiece to be punched in the No. 2 mold seat placed inside, thereby completing the forming of two screws by one punching. At the same time, two servo motors are provided to realize the rotation drive of the No. 1 mold seat and the No. 2 mold seat, thereby eliminating the need to perform the mold removal and mold placement operations after completing a single punching of a screw, thereby speeding up the stamping process.

[0016] (II) Beneficial effects

[0017] The present invention provides a punching die for screw production, which has the following beneficial effects:

[0018] The present invention provides a stamping die for screw production. During use, the stamping die can not only realize the rapid stamping and forming of screw workpieces in two groups of die seats, but also complete the processing and stamping of two groups of screws in one stamping, which is more efficient. At the same time, in the process of completing the forming of two screws by one stamping, two servo motors are used to realize the rotational drive of the No. 1 die seat and the No. 2 die seat, so there is no need to perform the operation steps of mold removal and mold release after completing one screw by a single stamping, which speeds up the stamping process and achieves the effect of saving time and labor. At the same time, the No. 2 die seat located at the upper end has the function of rapid disassembly and installation, and can quickly carry out mold replacement and take out the formed stamping workpiece for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the shaft side structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the front cross-section structure of the present invention;

[0021] Figure 3 For the present invention Figure 2 A schematic diagram of the structure at A;

[0022] Figure 4 For the present invention Figure 2 A schematic diagram of the structure at B;

[0023] Figure 5 It is a partial top view structural schematic diagram of the present invention;

[0024] Figure 6 It is a top view structural schematic diagram of the No. 2 mold base of the present invention;

[0025] Figure 7 It is a top view structural schematic diagram of the No. 2 mold base of the present invention;

[0026] Figure 8 It is a structural schematic diagram of the inner plate of the present invention;

[0027] Fig. 9 It is a partial cross-sectional structural schematic diagram of the No. 2 mold base of the present invention.

[0028] Among them, 1. Guide rod; 2. Twist block; 3. Stamping seat; 4. Through hole; 5. No. 1 stamping head; 6. No. 2 stamping head; 7. Base; 8. No. 1 mold seat; 9. No. 2 mold seat; 10. No. 1 servo motor; 11. Hydraulic push rod; 12. Connecting spring; 13. Stamping hole; 14. No. 1 gear; 15. No. 2 servo motor; 16. No. 1 gear block; 17. Screw mold hole; 18. No. 2 gear; 19. Inner plate; 20. Limit Seat; 21, torsion rod; 22, bevel gear No. 1; 23, bevel gear No. 2; 24, linkage worm; 25, threaded rod; 26, rotating shaft; 27, worm wheel; 28, push plate; 29, gear block No. 2; 601, bottom block; 602, hexagonal punch; 901, upper plate; 902, lower plate; 903, placement hole; 904, slot; 1901, top plate; 1902, connecting plate; 1903, semicircular plate; 1904, placement cavity. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example:

[0031] like Figure 1-9 As shown, the embodiment of the present invention provides a stamping die for screw production, including a stamping seat 3 and a base 7, a through hole 4 is opened at the lower end of the front end surface of the stamping seat 3, a No. 2 die seat 9 is embedded in the through hole 4, an inner plate 19 is rotatably arranged at the midpoint of the inside of the stamping seat 3, the inner plate 19 includes a top plate 1901, a connecting plate 1902 is fixedly arranged at the lower end of the top plate 1901, a semi-circular plate 1903 is fixedly arranged at the rear side of the lower end of the connecting plate 1902, the top plate 1901, the connecting plate 1902 and the semi-circular plate 1903 are connected to form a placement cavity 1904, a push plate 28 is embedded in the top end surface of the placement cavity 1904, a plurality of connecting springs 12 are arranged at the lower end of the push plate 28, and a limiting seat 20 is fixedly arranged at the end of the connecting spring 12 away from the push plate 28;

[0032] A rotating shaft 26 is rotatably provided on the upper end surface of the top plate 1901, and the end of the rotating shaft 26 away from the top plate 1901 is rotatably provided in the stamping seat 3, a threaded rod 25 is threadedly sleeved inside the rotating shaft 26, and the lower end of the threaded rod 25 is rotatably sleeved with the upper end of the push plate 28, a worm gear 27 is fixedly sleeved on the outer side of the rotating shaft 26, and the rear end of the worm gear 27 is located inside the stamping seat 3 and a linkage worm 24 connected to the worm gear 27 is provided, a No. 2 punch head 6 is fixedly provided on one side of the upper end surface of the base 7, the No. 2 punch head 6 includes a bottom block 601 and a hexagonal punch 602, a No. 1 mold seat 8 is rotatably provided inside the base 7, and a plurality of No. 1 tooth blocks 16 are fixedly provided on the outer wall of the No. 1 mold seat 8 near the lower end, the upper end of the No. 1 mold seat 8 passes through the base 7, and a plurality of screw mold holes 17 are circumferentially arranged at equal intervals on the outer periphery of the upper end surface.

[0033] Specifically, the through hole 4 opened at the front end of the stamping seat 3 can ensure the quick insertion and removal of the No. 2 mold seat 9, which is convenient for the quick replacement of the mold and the unloading and removal process of the workpiece after stamping; the rotating shaft 26 and the top plate 1901 are connected by a rotation connection to ensure that the two do not interfere with each other when they rotate independently, and the threaded rod 25 is threadedly sleeved with the rotating shaft 26 and the lower end of the threaded rod 25 is sleeved with the push plate 28. When the rotating shaft 26 rotates to push the threaded rod 25 downward, it will generate a thrust on the push plate 28 at the lower end, thereby achieving a downward pushing effect.

[0034] Reference Figure 1 and Figure 2, guide rods 1 are fixedly arranged at the front and rear ends of both sides of the upper end surface of the base 7, a mounting plate is fixedly arranged on the upper end surface of the guide rod 1, and a hydraulic push rod 11 is fixedly arranged at the midpoint of the upper end surface of the mounting plate, and the stamping seat 3 is slidably sleeved on the four guide rods 1 and the upper surface is fixedly connected to the output end of the hydraulic push rod 11;

[0035] Specifically, the guiding and limiting functions of the guide rod 1 are utilized to ensure the vertical movement of the punching seat 3 , and the hydraulic push rod 11 at the upper end is used as a punching power source to realize the downward pushing punching of the punching seat 3 .

[0036] Reference Figure 2 and Figure 8 A servo motor No. 10 is fixedly arranged on one side of the upper end surface of the punching seat 3, and a gear No. 2 18 is fixedly arranged on the output end of the servo motor No. 1 10. A plurality of gear blocks No. 2 29 are arranged around the outer wall of the top plate 1901 at equal intervals and mesh with the gear No. 2 18;

[0037] Specifically, when in use, since the No. 2 gear 18 is meshed with the No. 2 tooth block 29 on the outer wall of the top plate 1901, when the No. 1 servo motor 10 drives the No. 2 gear 18 at the output end to rotate, the No. 2 gear 18 continuously meshes with the No. 2 tooth block 29, and the No. 2 tooth block 29 is installed on the outer wall of the top plate 1901, thereby realizing the continuous rotation of the top plate 1901, thereby making the entire inner plate 19 and the components fixed inside the inner plate 19 rotate synchronously and in linkage for use.

[0038] Reference Figure 2 , Figure 3 , Figure 4 and Figure 8 The second mold seat 9 includes an upper plate 901, a lower plate 902 is fixedly provided at the lower end of the upper plate 901, a plurality of placement holes 903 are arranged around the upper end surface of the upper plate 901 at equal intervals, and a card slot 904 is opened at the midpoint of both sides of the outer wall of the upper plate 901, and a card block is fixedly provided on both sides of the lower end surface of the limiting seat 20, and the two card blocks are respectively embedded in the two card slots 904 to complete the clamping and fixing of the No. 2 mold seat 9, so that it can achieve linkage; a No. 2 bevel gear 23 is fixedly provided at one end of the linkage worm 24 away from the worm gear 27, a No. 1 bevel gear 22 meshing with the No. 2 bevel gear 23 is arranged inside the stamping seat 3, and a torsion rod 21 is fixedly provided inside the No. 1 bevel gear 22, and a torsion block 2 is fixedly provided at one end of the torsion rod 21 away from the No. 1 bevel gear 22, and the torsion block 2 is located on the upper surface of the stamping seat 3;

[0039] Specifically, when it is necessary to install the No. 2 mold base 9 inside the inner disk 19 to form an integrated linkage structure therewith, first insert the No. 2 mold base 9 into the inner disk 19 through the through hole 4 at the front end, and then rotate the torsion block 2 at the upper end to drive the torsion rod 21 to rotate. The rotation of the torsion rod 21 causes the No. 1 bevel gear 22 at the lower end to drive the No. 2 bevel gear 23 to rotate. The rotation of the No. 2 bevel gear 23 causes the linkage worm 24 to rotate, and the worm gear 27 rotates accordingly. The worm gear 27 is fixed on the rotating shaft 26. At this time, the rotating shaft 26 rotates to move the threaded rod 25 connected to the internal thread downward, thereby squeezing the push plate 28 to move it downward. The push plate 28 pushes the connecting spring 12 at the lower end and squeezes the limiting seat 20 so that the clamping block at the lower end is embedded in the clamping groove 904 at the upper end of the No. 2 mold base 9 to complete the clamping and fixed connection.

[0040] Reference Figure 1 , Figure 2 and Figure 5 A No. 1 punch head 5 is fixedly arranged at the midpoint of the front side of the lower end surface of the punching seat 3, and the No. 1 punch head 5 corresponds vertically to one of the multiple screw die holes 17 on the upper end surface of the No. 1 die seat 8; a punch hole 13 is opened at the midpoint of one side of the lower end surface of the punching seat 3, and the punch hole 13 corresponds vertically to the hexagonal punch 602, and the hexagonal punch 602 is fixedly arranged at the midpoint of the upper end of the bottom block 601, and the bottom block 601 is fixedly arranged at the upper end of the base 7;

[0041] Specifically, when the stamping work is performed, the hydraulic push rod 11 pushes the stamping seat 3 at the lower end downward, and the No. 1 stamping head 5 is located at the lower end of the stamping seat 3 so that it moves downward for stamping. During the continuous downward pressing process of the stamping seat 3, the distance between the No. 2 stamping head 6 and the No. 2 stamping head 6 is shortened. Subsequently, the No. 2 stamping head 6 completes the movement through the stamping hole 13 in the process of approaching the stamping seat 3 to realize the upward stamping working state.

[0042] Reference Figure 2 A second servo motor 15 is embedded in one side of the base 7 and a first gear 14 is fixedly provided at the output end of the second servo motor 15. The first gear 14 is meshed with a plurality of first gear blocks 16 on the outer wall of the first mold base 8.

[0043] Specifically, when in use, the No. 2 servo motor 15 is started to drive the No. 1 gear 14 at the output end to rotate, and the No. 1 gear 14 rotates to complete the movement of the No. 1 gear block 16 meshing with it, and the No. 1 gear block 16 is installed on the outer wall of the No. 1 mold base 8, and then completes the rotation of the No. 1 mold base 8, thereby realizing the position conversion of the multiple screw mold holes 17 at the upper end.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stamping die for screw production, comprising a stamping seat (3) and a base (7), characterized in that: A through hole (4) is provided at the lower end of the front end surface of the punching seat (3), and a No. 2 mold seat (9) is embedded in the through hole (4). An inner disk (19) is rotatably provided at the midpoint of the inside of the punching seat (3), and the inner disk (19) includes a top disk (1901), a connecting disk (1902) is fixedly provided at the lower end of the top disk (1901), and a semi-circular disk (1903) is fixedly provided at the rear side of the lower end of the connecting disk (1902). The top disk (1901), the connecting disk (1902) and the semi-circular disk (1903) are connected to form a placement cavity (1904), and a push plate (28) is embedded in the top end surface of the placement cavity (1904), and a plurality of connecting springs (12) are provided at the lower end of the pushing plate (28), and a limiting seat (20) is fixedly provided at one end of the connecting spring (12) away from the pushing plate (28); The upper end surface of the top plate (1901) is rotatably provided with a rotating shaft (26), and one end of the rotating shaft (26) away from the top plate (1901) is rotatably provided in the punching seat (3), the internal thread sleeve of the rotating shaft (26) is threadedly sleeved with a threaded rod (25), and the lower end of the threaded rod (25) is rotatably sleeved with the upper end of the push plate (28), the outer side of the rotating shaft (26) is fixedly sleeved with a worm wheel (27), and the rear end of the worm wheel (27) is located inside the punching seat (3) and is provided with a linkage worm wheel (27) connected to the worm wheel (27). A rod (24) is provided, a No. 2 punch head (6) is fixedly arranged on one side of the upper end surface of the base (7), the No. 2 punch head (6) comprises a bottom block (601) and a hexagonal punch (602), a No. 1 die seat (8) is rotatably arranged inside the base (7), and a plurality of No. 1 tooth blocks (16) are fixedly arranged at the lower end of the outer wall of the No. 1 die seat (8), the upper end of the No. 1 die seat (8) passes through the base (7), and a plurality of screw die holes (17) are arranged around the outer periphery of the upper end surface at equal intervals.

2. A punching die for screw production according to claim 1, characterized in that: Guide rods (1) are fixedly arranged at the front and rear ends of both sides of the upper end surface of the base (7); a mounting plate is fixedly arranged on the upper end surface of the guide rod (1) and a hydraulic push rod (11) is fixedly arranged at the midpoint of the upper end surface of the mounting plate; the stamping seat (3) is slidably sleeved on the four guide rods (1) and the upper surface is fixedly connected to the output end of the hydraulic push rod (11).

3. A punching die for screw production according to claim 1, characterized in that: A No. 1 servo motor (10) is fixedly arranged on one side of the upper end surface of the punching seat (3), and a No. 2 gear 1 (8) is fixedly arranged on the output end of the No. 1 servo motor (10), and a plurality of No. 2 gear blocks (29) are evenly spaced around the outer wall of the top plate (1901) and mesh with the No. 2 gear (18).

4. A punching die for screw production according to claim 1, characterized in that: The second mold base (9) comprises an upper plate (901), a lower plate (902) is fixedly arranged at the lower end of the upper plate (901), a plurality of placement holes (903) are arranged around the upper end surface of the upper plate (901) at equal intervals, and clamping grooves (904) are opened at the midpoints of both sides of the outer wall of the upper plate (901), and clamping blocks are fixedly arranged on both sides of the lower end surface of the limiting seat (20), and the two clamping blocks are respectively embedded in the two clamping grooves (904) to complete the clamping and fixing of the second mold base (9), so that it can achieve linkage.

5. The punching die for screw production according to claim 1, characterized in that: A No. 1 punch head (5) is fixedly arranged at the front midpoint of the lower end surface of the punch seat (3), and the No. 1 punch head (5) vertically corresponds to one of the plurality of screw die holes (17) on the upper end surface of the No. 1 die seat (8).

6. A punching die for screw production according to claim 1, characterized in that: A punching hole (13) is provided at the midpoint of one side of the lower end surface of the punching seat (3), and the punching hole (13) corresponds vertically to the hexagonal punch (602) up and down. The hexagonal punch (602) is fixedly arranged at the midpoint of the upper end of the bottom block (601), and the bottom block (601) is fixedly arranged at the upper end of the base (7).

7. A punching die for screw production according to claim 1, characterized in that: A No. 2 servo motor (15) is embedded in one side of the interior of the base (7), and a No. 1 gear (14) is fixedly provided at the output end of the No. 2 servo motor (15), and the No. 1 gear (14) is meshed with a plurality of No. 1 tooth blocks (16) on the outer wall of the No. 1 mold base (8).

8. The punching die for screw production according to claim 1, characterized in that: A second bevel gear (23) is fixedly arranged at one end of the linkage worm (24) away from the worm wheel (27), a first bevel gear (22) meshing with the second bevel gear (23) is arranged inside the stamping seat (3), and a torsion rod (21) is fixedly arranged inside the first bevel gear (22), and a torsion block (2) is fixedly arranged at one end of the torsion rod (21) away from the first bevel gear (22), and the torsion block (2) is located on the upper surface of the stamping seat (3).

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