Die switching mechanism and usage method of a screw heading cold heading machine

Abstract

The present invention discloses a die switching mechanism and a usage method for a screw heading cold header, which includes a linear displacement arm. A transmission slider is slidably connected to the linear displacement arm. The transmission slider is connected to a lifting transmission mechanism. The lifting transmission mechanism is connected to a vertical installation slide table that is slidably connected to the die holder up and down. The vertical installation slide table is connected with an upper displacement limiting component and a lower displacement limiting component that respectively cooperate with the die holder. The transmission slider and the linear displacement arm are displaced along the same straight line direction. An elastic buffer mechanism is connected between the transmission slider and the linear displacement arm. The up and down displacement height of the vertical installation slide table is directly adjusted, and the elastic buffer mechanism is used to absorb the excess displacement amount of the linear displacement arm, so as to solve the problem of inconvenient debugging of transmission parts.

Description

Technical Field

[0001] The present invention relates to the field of screw heading cold heading machine equipment, and particularly relates to a die switching mechanism and a usage method of a screw heading cold heading machine. Background Art

[0002] A screw heading cold heading machine is generally also called a heading machine, a button installing machine, a head covering machine, a head tying machine, and is now commonly produced in China. It is generally used to manufacture parts such as bolts, nuts, iron nails, rivets, and steel balls. Its principle is based on the metal plastic deformation theory. At normal temperature, a certain pressure is applied to the metal blank, so that plastic deformation occurs in the die cavity, and the top of the bar or wire is thickened and forged into shape; currently, the market has relatively high requirements for the reliability, processing efficiency, processing accuracy, and product quality stability of screw heading cold heading machine equipment.

[0003] For example, the utility model patent with the publication number CN213559375U discloses a transmission device for the upper and lower dies of a one - die two - punch screw heading machine, including a frame, a transmission component rotatably connected to the frame, a die component connected to the transmission component, and an impact component with one end used to push the die component and the other end connected to a pushing device.

[0004] Through the mutual cooperation of each rocker arm transmission component and the die component in the above - mentioned scheme, the two - punch position is limited by the limiting piece of the die walking table, reducing the adjustment of the two - punch die seat and the contact between the worker and the die, and can also achieve automatic two - punch; however, the defect is that only the limiting piece of the die walking table is used to limit the two - punch position. After the limiting piece is debugged, it is still necessary to manually debug the corresponding rocker arm transmission components to make them correspond to the limiting amount. Otherwise, it is easy to cause motion interference. The debugging process is cumbersome, requires high operation experience, takes a long time, and increases the work difficulty and labor cost. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art, and provide a die switching mechanism and a usage method of a screw heading cold heading machine, which directly adjust the up - and - down displacement height of a vertically installed sliding table, and cooperate with an elastic buffer mechanism to absorb the excess displacement of a linear displacement arm, so as to solve the problem of inconvenient debugging of transmission parts.

[0006] To achieve the above - mentioned purpose, the technical solution adopted by the present invention is:

[0007] A die switching mechanism for a screw heading cold heading machine, comprising a linear displacement arm, a transmission slider is slidably connected to the linear displacement arm, the transmission slider is connected to a lifting transmission mechanism, the lifting transmission mechanism is connected to a vertical installation slide table for slidably connecting with a die holder up and down, the vertical installation slide table is connected with an upper displacement limiting component and a lower displacement limiting component respectively cooperating with the die holder; the transmission slider and the linear displacement arm are displaced along the same straight line direction, and an elastic buffer mechanism is connected between the transmission slider and the linear displacement arm.

[0008] The linear displacement arm is of a strip plate structure, the linear displacement arm is provided with a through groove extending along the displacement direction, the transmission slider is slidably connected with the through groove, and the elastic buffer mechanism is fixedly installed in the through groove.

[0009] The elastic buffer mechanism includes a movable rod and a first clamping piece, a first fixing piece, a first movable pushing block, a spring, a second movable pushing block, a second fixing piece and a second clamping piece sequentially sleeved outside the movable rod; one end of the movable rod is fixedly connected with the transmission slider; the first clamping piece and the second clamping piece are respectively fixedly connected with both ends of the movable rod; the first fixing piece and the second fixing piece are respectively fixedly connected with the through groove; the first movable pushing block and the second movable pushing block respectively abut against the first fixing piece and the second fixing piece; both ends of the spring respectively abut against the first movable pushing block and the second movable pushing block; the first clamping piece abuts against the first movable pushing block, and the first clamping piece and the second movable pushing block abut against each other.

[0010] The movable rod is provided with an external thread, and both the first clamping piece and the second clamping piece include two locking nuts, and the locking nuts are threadedly connected with the movable rod.

[0011] The first fixing piece includes a female sleeve, a male sleeve and a locking sleeve, the female sleeve is fixedly connected with the through groove, the male sleeve is threadedly sleeved inside the female sleeve, the locking sleeve is threadedly sleeved outside the male sleeve, and the locking sleeve tightly abuts against one end of the female sleeve; the female sleeve abuts against the movable end plate.

[0012] The first movable pushing block includes a movable end plate and a movable sleeve, one side of the movable end plate abuts against the spring, the other side abuts against the movable sleeve, and the movable sleeve is sleeved inside the male sleeve and is slidably connected with the male sleeve.

[0013] A cross plate is fixedly connected to the upper end of the vertical installation slide table; the upper displacement limiting component includes a first screw rod, the lower displacement limiting component includes a second screw rod, the first screw rod and the second screw rod are threadedly penetrated and connected with the cross plate, locking nuts are connected to the upper ends of the first screw rod and the second screw rod, the locking nuts tightly abut against the cross plate, and the lower end of the first screw rod penetrates through the top shell of the die holder and then is connected with an upper displacement limiting nut.

[0014] The transmission mechanism includes a first rotating plate, a rotating shaft, a second rotating plate, a lifting slider, and an I-shaped sliding seat; one end of the first rotating plate is hinged to the transmission slider, and the other end is fixedly connected to the rotating shaft. A lubricating copper sleeve is sleeved outside the rotating shaft, and the lubricating copper sleeve is fixedly installed on the support table. The other end of the rotating shaft is fixedly connected to two second rotating plates, and each second rotating plate is connected to a lifting slider; the two lifting sliders are respectively slidably arranged in the U-shaped sliding grooves on both sides of the I-shaped sliding seat. A transverse sliding groove is provided in the middle partition of the I-shaped sliding seat, and the two lifting sliders are connected by a pin shaft passing through the transverse sliding groove. The I-shaped sliding seat is fixedly connected to the vertical installation sliding table.

[0015] It includes a linear transmission mechanism, and the linear transmission mechanism includes a fixed block, an eccentric cam, a first limiting wheel, and a second limiting wheel; the fixed block is fixed to the machine body, and the linear displacement arm is provided with a sliding groove that cooperates with the fixed block; the first limiting wheel and the second limiting wheel are respectively arranged on both sides of the sliding groove and are fixedly connected to the linear displacement arm; the eccentric cam is arranged on one side of the fixed block and is connected to the driving main shaft, and the first limiting wheel and the second limiting wheel are respectively in sliding contact with the eccentric cam.

[0016] A usage method of a die switching mechanism includes the following steps:

[0017] S1. The driving main shaft drives the linear displacement arm to move linearly through the linear transmission mechanism, and the linear displacement arm drives the transmission slider to move in the same linear direction through the elastic buffer mechanism;

[0018] S2. The transmission slider drives the vertical installation sliding table to move up and down through the lifting transmission mechanism until the upper displacement limiting component or the lower displacement limiting component abuts against the die seat, causing the vertical installation sliding table to stop displacement;

[0019] S3. The linear displacement arm continues to displace in the original direction, and the transmission slider compresses the elastic buffer mechanism.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] By arranging the upper displacement limiting component and the lower displacement limiting component on the vertical installation sliding table, directly adjusting the up and down displacement height of the vertical installation sliding table, and cooperating with the elastic buffer mechanism to absorb the excess displacement of the linear displacement arm, the first die and the second die can be accurately switched and always aligned with the product to be processed. That is to say, by directly limiting and adjusting the final actuator, it is more intuitive and convenient, the operation is simple, and the problems of inconvenient operation caused by adjusting the transmission parts and long debugging time are avoided;

[0022] By setting an elastic buffer mechanism, during the process when the vertically installed sliding table stops moving and changes the direction of movement, the elastic buffer mechanism absorbs the kinetic energy. After the linear displacement arm changes the direction of movement, the elastic buffer mechanism releases the potential energy and pushes the linear displacement arm to move in the opposite direction, thereby achieving rapid commutation, reducing the inertial load of the driving component, and making the eccentric cam of the driving part move more smoothly.

[0023] By setting a female sleeve, a male sleeve and a locking sleeve, the male sleeve is threadedly sleeved inside the female sleeve, and the female sleeve abuts against the movable end plate. By adjusting the displacement amount of the male sleeve screwed into the female sleeve, the pre-compression amount of the spring is adjusted, so that the spring has a proper thrust to avoid too large or too small thrust. Brief Description of the Drawings

[0024] Figure 1 is an overall three-dimensional view of the die switching mechanism of the present invention;

[0025] Figure 2 is an exploded view of the die switching mechanism of the present invention;

[0026] Figure 3 is a partial three-dimensional view of the die switching mechanism of the present invention;

[0027] In the figure: 1. Linear displacement arm; 2. Transmission slider; 3. Vertically installed sliding table; 4. Through groove; 5. Movable rod; 6. First clamping member; 7. Movable end plate; 8. Spring; 9. Second movable push block; 10. Second clamping member; 12. Movable sleeve; 13. Female sleeve; 14. Male sleeve; 15. Locking sleeve; 16. Second fixing member; 18. First screw rod; 19. Second screw rod; 20. Upper displacement limiting nut; 21. First rotating plate; 22. Rotating shaft; 23. Second rotating plate; 24. Lifting slider; 25. I-shaped sliding seat; 26. Support table; 27. Transverse sliding groove; 28. Fixed block; 29. Eccentric cam; 30. First limiting wheel; 31. Second limiting wheel; 32. Guide sliding groove. Detailed Embodiment

[0028] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0029] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", "horizontal", "vertical", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0030] As Figures 1 to 3 shown, a die switching mechanism of a screw heading cold heading machine includes a linear displacement arm 1. The linear displacement arm 1 is slidably connected with a transmission slider 2. The transmission slider 2 is connected with a lifting transmission mechanism. The lifting transmission mechanism is connected with a vertical installation slide 3 which is slidably connected with a die holder (not shown in the figure) up and down. The vertical installation slide 3 is connected with an upper displacement limiting component and a lower displacement limiting component which respectively cooperate with the die holder. The transmission slider 2 and the linear displacement arm 1 are displaced in the same linear direction. An elastic buffer mechanism is connected between the transmission slider 2 and the linear displacement arm 1.

[0031] In the above solution, the linear displacement arm 1 drives the transmission slider 2 to move in the same linear direction through the elastic buffer mechanism. The transmission slider 2 drives the vertical installation slide 3 to move up and down through the lifting transmission mechanism until the upper displacement limiting component or the lower displacement limiting component abuts against the die holder, so that the vertical installation slide 3 stops displacement.

[0032] By setting the elastic buffer mechanism, after the vertical installation slide 3 is limited and stops displacement, the linear displacement arm 1 continues to displace a certain distance in the original direction, and the transmission slider 2 compresses the elastic buffer mechanism. When the linear displacement arm 1 changes the movement direction, the elastic buffer mechanism releases potential energy and pushes the linear displacement arm 1 to move in the opposite direction.

[0033] By arranging the upper displacement limiting component and the lower displacement limiting component on the vertical installation slide 3, directly adjusting the up and down displacement height of the vertical installation slide 3, and cooperating with the elastic buffer mechanism to absorb the excess displacement of the linear displacement arm 1, the first die and the second die can be accurately switched and always aligned with the product to be processed. That is to say, by directly limiting and adjusting the final actuator, it is more intuitive and convenient, the operation is simple, and the problems of inconvenient operation caused by adjusting the transmission parts and long debugging time are avoided.

[0034] By setting the elastic buffer mechanism, during the process from when the vertical installation slide 3 stops moving to when it changes the movement direction, the elastic buffer mechanism absorbs the movement potential energy. After the linear displacement arm 1 changes the movement direction, the elastic buffer mechanism releases potential energy and pushes the linear displacement arm 1 to move in the opposite direction, so as to realize rapid commutation, reduce the inertial load of the driving component, and make the eccentric cam of the driving part move more smoothly.

[0035] In some embodiments, the linear displacement arm 1 is a strip plate structure. The linear displacement arm 1 is provided with a through groove 4 extending along the displacement direction. The transmission slider 2 is slidably connected to the through groove 4, and the elastic buffer mechanism is fixedly installed in the through groove 4. By arranging the transmission slider 2 and the elastic buffer mechanism in the through groove, the overall occupied space is reduced, and the integration degree is higher.

[0036] Specifically, as Figure 2 shown, the elastic buffer mechanism includes a movable rod 5, and a first clamping member 6, a first fixing member, a first movable push block, a spring ⑧, a second movable push block 9, a second fixing member 16 and a second clamping member 10 sleeved on the outer side of the movable rod 5 in sequence; one end of the movable rod 5 is fixedly connected to the transmission slider 2; the first clamping member 6 and the second clamping member 10 are respectively fixedly connected to both ends of the movable rod 5; the first fixing member and the second fixing member 16 are respectively fixedly connected to the through groove 4; the first movable push block and the second movable push block 9 respectively abut against the first fixing member and the second fixing member; both ends of the spring 8 respectively abut against the first movable push block and the second movable push block 9; the first clamping member 6 abuts against the first movable push block, and the first clamping member 6 and the second movable push block 9 abut against each other.

[0037] When the vertical installation slide 3 is stopped by the upper limit position and stops moving, the transmission slider 2 and the movable rod 5 also stop moving. The linear displacement arm 1 continues to move leftward for a certain distance, and the first clamping member 6 pushes the first movable push block to compress the spring 8; when the vertical installation slide 3 is stopped by the lower limit position and stops moving, the transmission slider 2 and the movable rod 5 also stop moving. The linear displacement arm 1 continues to move rightward for a certain distance, and the second clamping member 10 pushes the second movable push block to compress the spring 8.

[0038] The movable rod 5 is provided with an external thread. Both the first clamping member 6 and the second clamping member 10 include two locking nuts, and the locking nuts are threadedly connected to the movable rod 5. Thus, it is convenient to adjust the positions of the first clamping member 6 and the second clamping member 10 on the movable rod 5, so that the first clamping member 6 contacts the first movable push block and the second clamping member 10 contacts the second movable push block.

[0039] The first fixing member includes a female sleeve 13, a male sleeve 14 and a locking sleeve 15. The female sleeve 13 is fixedly connected to the through groove 4. The male sleeve 14 is threadedly sleeved inside the female sleeve 13. The locking sleeve 15 is threadedly sleeved outside the male sleeve 14, and the locking sleeve 15 abuts against one end of the female sleeve 13. The female sleeve 13 abuts against the movable end plate 7. Since the female sleeve 13 abuts against the movable end plate 7 and the movable end plate 7 abuts against the spring 8, by adjusting the displacement of the male sleeve 14 screwed into the female sleeve 13, the pre-compression amount of the spring 8 can be adjusted, so that the spring 8 has an appropriate thrust, avoiding that due to too small thrust, when the linear displacement arm 1 makes a rapid displacement, the slider 2 lags too much due to inertia, thus affecting the production efficiency, and also avoiding that due to too large thrust, the compression amount of the spring 8 is limited, resulting in a large load and affecting the service life of the driving member.

[0040] The first movable push block includes a movable end plate 7 and a movable sleeve 12. One side of the movable end plate 7 abuts against the spring 8, and the other side abuts against the movable sleeve 12. The movable sleeve 12 passes through the first fixing member and abuts against the first clamping member 6. The movable sleeve 12 is sleeved inside the male sleeve 14 and is slidably connected to the male sleeve 14. By arranging the movable sleeve 12 to pass through the male sleeve 14, it serves as an intermediate member to transmit the thrust of the first clamping member 6 to the movable end plate 7 and the spring 8.

[0041] In some embodiments, a cross plate is fixedly connected to the upper end of the vertical mounting slide 3. The upper displacement limiting assembly includes a first screw rod 18, and the lower displacement limiting assembly includes a second screw rod 19. The first screw rod 18 and the second screw rod 19 are threadedly penetrated and connected to the cross plate. Locking nuts are connected to the upper ends of the first screw rod 18 and the second screw rod 19, and the locking nuts abut against the cross plate. The lower end of the first screw rod 18 passes through the top shell of the die holder and is connected to an upper displacement limiting nut 20. When the vertical mounting slide 3 moves upward, the upper displacement limiting nut 20 of the first screw rod 18 abuts against the inner side of the top shell of the die holder to achieve limiting. When the vertical mounting slide 3 moves downward, the lower end of the second screw rod 19 abuts against the outer side of the top shell of the die holder to achieve lower limit.

[0042] The die holder is a common component of a screw heading cold heading machine. The die holder is driven by the main shaft to make reciprocating motions, driving the die to perform heading operations on screws.

[0043] In some embodiments, the transmission mechanism includes a first rotating plate 21, a rotating shaft 22, a second rotating plate 23, a lifting slider 24, and an I-shaped sliding seat 25; one end of the first rotating plate 21 is hingedly connected to the transmission slider 2, and the other end is fixedly connected to the rotating shaft 22. A lubricating copper sleeve is sleeved outside the rotating shaft 22, and the lubricating copper sleeve is fixedly installed on the support table 26. The other end of the rotating shaft 22 is fixedly connected to two of the second rotating plates 23, and each of the second rotating plates 23 is connected to one of the lifting sliders 24; the two lifting sliders 24 are respectively slidably disposed in the U-shaped sliding grooves on both sides of the I-shaped sliding seat 25. A transverse sliding groove 27 is provided in the middle partition of the I-shaped sliding seat 25. The two lifting sliders 24 are connected by a pin shaft passing through the transverse sliding groove 27. The I-shaped sliding seat 25 is fixedly connected to the vertical installation slide 3.

[0044] Preferably, the first rotating plate 21 is hingedly connected to the lifting slider 24 through a pin slot; the lifting slider 24 drives the first rotating plate 21, the rotating shaft 22, and the second rotating plate 23 to rotate in sequence. The second rotating plate 23 drives the lifting slider 24 to perform a circular motion, and the lifting slider 24 drives the I-shaped sliding seat 25 to perform a lifting motion; the transverse sliding groove 27 is also used for guiding the transverse displacement of the vertical installation slide 3.

[0045] In some embodiments, a linear transmission mechanism is further included. The linear transmission mechanism includes a fixed block 28, an eccentric cam 29, a first limiting wheel 30, and a second limiting wheel 31; the fixed block 28 is fixed to the machine body, and the linear displacement arm 1 is provided with a guiding sliding groove 32 that cooperates with the fixed block 28 for sliding; the first limiting wheel 30 and the second limiting wheel 31 are respectively disposed on both sides of the guiding sliding groove 32 and are fixedly connected to the linear displacement arm 1; the eccentric cam 29 is disposed on one side of the fixed block 28 and is connected to the driving main shaft, and the first limiting wheel 30 and the second limiting wheel 31 are respectively in sliding contact with the eccentric cam 29.

[0046] The fixed block 28 is fixedly installed on the machine body. The eccentric cam 29 rotates under the drive of the driving main shaft, sequentially squeezing the first limiting wheel 30 and the second limiting wheel 31 on both sides, causing the guiding sliding groove 32 to linearly displace along the fixed block 28, driving the linear displacement arm 1 to perform a reciprocating linear motion.

[0047] The present invention also provides a method for using a die switching mechanism, including the following steps:

[0048] S1. The driving main shaft drives the linear displacement arm 1 to move linearly through the linear transmission mechanism, and the linear displacement arm 1 drives the transmission slider 2 to move in the same linear direction through the elastic buffer mechanism;

[0049] S2. The driving slider 2 drives the vertically installed slide table 3 to move up and down through the lifting transmission mechanism until the upper displacement limit component or the lower displacement limit component abuts against the die holder, causing the vertically installed slide table 3 to stop moving.

[0050] S3. The linear displacement arm 1 continues to displace a certain distance along the original direction, and the driving slider 2 compresses the elastic buffer mechanism.

[0051] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A die switching mechanism for a screw heading cold heading machine, comprising a linear displacement arm (1), a transmission slider (2) is slidably connected to the linear displacement arm (1), the transmission slider (2) is connected to a lifting transmission mechanism, the lifting transmission mechanism is connected to a vertical installation slide (3) which is slidably connected to the die holder up and down, and the vertical installation slide (3) is connected with an upper displacement limit component and a lower displacement limit component which respectively cooperate with the die holder; characterized in that, The transmission slider (2) and the linear displacement arm (1) are displaced in the same linear direction, and an elastic buffer mechanism is connected between the transmission slider (2) and the linear displacement arm (1); When the vertically installed slide (3) is limited and stops displacing, the linear displacement arm (1) continues to displace a certain distance in the original direction, and the transmission slider (2) compresses the elastic buffer mechanism. When the linear displacement arm (1) changes the direction of motion, the elastic buffer mechanism releases potential energy and pushes the linear displacement arm (1) to move in the opposite direction; The linear displacement arm (1) is of a strip plate structure, and the linear displacement arm (1) is provided with a through groove (4) extending along the displacement direction. The transmission slider (2) is slidably connected to the through groove (4), and the elastic buffer mechanism is fixedly installed in the through groove (4); The elastic buffer mechanism includes a movable rod (5) and a first clamping member (6), a first fixing member, a first movable push block, a spring (8), a second movable push block (9), a second fixing member (16) and a second clamping member (10) that are sequentially sleeved outside the movable rod (5); one end of the movable rod (5) is fixedly connected to the transmission slider (2); the first clamping member (6) and the second clamping member (10) are respectively fixedly connected to both ends of the movable rod (5); the first fixing member and the second fixing member (16) are respectively fixedly connected to the through groove (4); the first movable push block and the second movable push block (9) respectively abut against the first fixing member and the second fixing member; both ends of the spring (8) respectively abut against the first movable push block and the second movable push block (9); the first clamping member (6) abuts against the first movable push block, and the second clamping member (10) abuts against the second movable push block (9); When the vertically installed slide (3) is limited by the upper limit and stops displacing, the transmission slider (2) and the movable rod (5) also stop moving, and the linear displacement arm (1) continues to displace a certain distance to the left, and the first clamping member (6) pushes the first movable push block to compress the spring (8); when the vertically installed slide (3) is limited by the lower limit and stops displacing, the transmission slider (2) and the movable rod (5) also stop moving, and the linear displacement arm (1) continues to displace a certain distance to the right, and the second clamping member (10) pushes the second movable push block to compress the spring (8); The movable rod (5) is provided with an external thread, and both the first clamping member (6) and the second clamping member (10) include two locking nuts, and the locking nuts are threadedly connected to the movable rod (5); The first fixing member includes a female sleeve (13), a male sleeve (14) and a locking sleeve (15). The female sleeve (13) is fixedly connected to the through groove (4), the male sleeve (14) is threadedly sleeved inside the female sleeve (13), the locking sleeve (15) is threadedly sleeved outside the male sleeve (14), and the locking sleeve (15) tightly abuts against one end of the female sleeve (13); the female sleeve (13) abuts against the movable end plate (7); The movable push block 1 includes a movable end plate (7) and a movable sleeve (12), one side of the movable end plate (7) abuts against the spring (8), and the other side abuts against the movable sleeve (12), and the movable sleeve (12) is sleeved inside the male sleeve (14) and is slidably connected to the male sleeve (14); The upper end of the vertically mounted slide (3) is fixedly connected to a transverse plate; the upper displacement limiting assembly includes a first screw rod (18), and the lower displacement limiting assembly includes a second screw rod (19); the first screw rod (18) and the second screw rod (19) are connected to the transverse plate through threads; the upper ends of the first screw rod (18) and the second screw rod (19) are both connected to locking nuts, and the locking nuts are tightly abutted against the transverse plate; the lower end of the first screw rod (18) passes through the top shell of the die seat and is connected to an upper displacement limiting nut (20); The lifting transmission mechanism includes a first rotating plate (21), a rotating shaft (22), a second rotating plate (23), a lifting slider (24), and an I-shaped slide (25); one end of the first rotating plate (21) is hingedly connected to the transmission slider (2), and the other end is fixedly connected to the rotating shaft (22); the outer side of the rotating shaft (22) is provided with a lubricating copper sleeve, and the lubricating copper sleeve is fixedly installed with the support platform (26); the other end of the rotating shaft (22) is fixedly connected to two second rotating plates (23), and each second rotating plate (23) is connected to one lifting slider (24); the two lifting sliders (24) are respectively slidably arranged in the U-shaped slide grooves on both sides of the I-shaped slide (25), and the middle partition rib of the I-shaped slide (25) is provided with a horizontal slide groove (27), and the two lifting sliders (24) are connected by a pin shaft passing through the horizontal slide groove (27), and the I-shaped slide (25) is fixedly connected to the vertical installation slide (3); The invention comprises a linear transmission mechanism, wherein the linear transmission mechanism comprises a fixed block (28), an eccentric cam (29), a first limiting wheel (30) and a second limiting wheel (31); the fixed block (28) is fixed to the machine body, and the linear displacement arm (1) is provided with a guide groove (32) that slides with the fixed block (28); the first limiting wheel (30) and the second limiting wheel (31) are respectively arranged on both sides of the guide groove (32) and are fixedly connected to the linear displacement arm (1); the eccentric cam (29) is arranged on one side of the fixed block (28) and is connected to the driving main shaft, and the first limiting wheel (30) and the second limiting wheel (31) are respectively in sliding contact with the eccentric cam (29).

2. The method of using the die switching mechanism according to claim 1, characterized in that, The following steps are involved: S1, the driving spindle drives the linear displacement arm (1) to move in a straight line through the linear transmission mechanism, and the linear displacement arm (1) drives the transmission slide (2) to move in the same straight line direction through the elastic buffer mechanism; S2, the transmission slide block (2) drives the vertical installation slide (3) to perform a lifting movement through the lifting transmission mechanism until the upper displacement limit assembly or the lower displacement limit assembly presses against the die seat, causing the vertical installation slide (3) to stop moving; S3. The linear displacement arm (1) continues to displace in the original direction, and the transmission slider (2) compresses the elastic buffer mechanism.

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