A variable-speed punching machine driven by a cam-type connecting rod

Abstract

The present invention relates to the technical field of punching presses, and discloses a variable-speed punching press driven by a cam-type connecting rod, including an installation bushing arranged on the machine body, a shaft seat fixedly installed on the installation bushing, a hammer head shaft rotatably connected to the shaft seat, a large gear rotatably connected to the hammer head shaft, an installation disk fixedly installed on one side of the large gear, a crankshaft detachably connected to one end of the hammer head shaft, a connecting rod fixedly connected to the other end of the hammer head shaft, a saw tooth fixedly connected to the bottom of the connecting rod, a transmission shaft rotatably connected inside the machine body, a small gear fixedly installed at one end of the transmission shaft, and the small gear and the large gear are meshed and driven. In this variable-speed punching press driven by a cam-type connecting rod, by controlling the angle between the crankshaft and the pull rod, the connecting rod and the saw tooth complete speed change, slow down the punching speed of the stamping die on the saw tooth, improve the processing accuracy of the equipment for precision parts, and improve the product quality control.

Description

Technical Field

[0001] The present invention relates to the technical field of punching machines, and specifically to a variable-speed punching machine driven by a cam-type connecting rod. Background Technique

[0002] As is well known, the power of a punching machine comes from the main motor. The main motor drives the flywheel to rotate through a V-belt connection. The flywheel drives the large gear to rotate. A punch is suspended on the large gear, and an upper die is arranged on the punch. The upper die presses downward in the slideway to complete the punching action. Since only one main motor controls the entire downward pressing and return process, the downward pressing speed and the return speed are the same. When the sheet metal thickness of the punched part is relatively large, if the speed of the main motor is too fast, it will cause an increase in burrs and footprints of the parts during the blanking of precision parts, and the surface finish cannot meet the requirements. If the rotational speed output by the main motor is too slow, precision punching of precision parts can be carried out, but the return speed will be very slow. In the same amount of time, the number of parts that can be processed will be greatly reduced. In the design of punching machines, the traditional connecting rod structure and driving structure of punching machines have low production efficiency and low product quality yield. For this reason, we propose a cold forging type aluminum alloy forging manufacturing equipment. For this reason, we propose a variable-speed punching machine driven by a cam-type connecting rod. Summary of the Invention

[0003] The purpose of the present invention is to provide a variable-speed punching machine driven by a cam-type connecting rod to solve the problems raised in the above background technique.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A variable-speed punching machine driven by a cam-type connecting rod, including a machine body, an installation bushing is arranged on the machine body, a shaft seat is fixedly installed on the installation bushing, a hammer head shaft is rotatably connected to the shaft seat, a large gear is rotatably connected to the hammer head shaft, an installation disk is fixedly installed on one side of the large gear, one end of the hammer head shaft is detachably connected to a crankshaft, the other end of the hammer head shaft is fixedly connected to a connecting rod, a saw tooth is fixedly connected to the bottom of the connecting rod, a transmission shaft is rotatably connected inside the machine body, a small gear is fixedly installed at one end of the transmission shaft, the small gear and the large gear are meshed and driven, the other end of the transmission shaft is fixedly connected to a flywheel, the flywheel is connected to the inside of the machine body through a belt, a fixing position is provided on the outside of the crankshaft, a fixing shaft is installed on the fixing position, a pulling rod is installed on the fixing shaft, and the pulling rod and the large gear are detachably connected together, and an installation pin is detachably connected between the crankshaft and the hammer head shaft.

[0005] Preferably, a plurality of position-changing holes are annularly distributed on the large gear, and the distance between adjacent two of the position-changing holes is equal.

[0006] Preferably, a fixing seat is fixedly installed on the outside of one end of the pull rod, and a first turntable is rotatably connected to one end of the fixing seat. A thread is provided on the inner ring of the first turntable, and a mounting groove is slidably connected to the inner ring of the first turntable. A resistance cavity is provided on the mounting groove, and a threaded strip is movably connected in the resistance cavity. The inner ring of the first turntable cooperates with the threaded strip, and one end of the mounting groove extends into the pull rod, and a shaft cover is fixedly installed on the end of the mounting groove, and a plurality of first springs are fixedly installed between the shaft cover and the pull rod.

[0007] Preferably, a small disc shaft gear is rotatably connected inside the machine body, a main shaft gear is fixedly installed on one side of the flywheel, a transition gear is transmission-connected between the main shaft gear and the small disc shaft gear, a wheel speed detector is fixedly installed at the cross section of one end of the hammer shaft, and the shaft of the small disc shaft gear passes through the inner ring of the wheel speed detector.

[0008] Preferably, the wheel speed detector is rotatably connected to a rotating rod, to which at least two dividers are fixedly connected, fixing plates are fixedly installed inside the hammer shaft and on the guide rail, each fixing plate is movably connected to a force rod, a second spring is fixedly connected between the force rod and the fixing plate, the rotating rod and the small disc shaft gear are coaxially connected together; an involvement keyway is provided on the inner ring of the crankshaft, and the mounting pin is slidably connected to the involvement keyway.

[0009] Preferably, one end of the mounting pin is rotatably connected to the second turntable, one side of the second turntable is fixedly mounted with an internally threaded rod, the internal thread of the internally threaded rod is threadedly connected to an externally threaded rod, one end of the externally threaded rod is fixedly mounted with a head block, and both sides of the other end of the mounting pin are movably connected with wedge blocks, the head block and the wedge block are connected together by magnetic attraction, and the inclined surfaces of the head block and the wedge block match each other.

[0010] Preferably, the distributor comprises a fixing ring arranged on the rotating rod, and a plurality of extension rods installed on the fixing ring, one end of each extension rod and the outer ring of the touch rod are chamfered, and the touch rod and the extension rod are made of rigid material.

[0011] Preferably, the mounting pin is made of iron, and when the distributor rotates, the sliding distance of the mounting pin on the guide rail does not exceed the outside of the hammer shaft.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. During the counterclockwise rotation of the large gear in the present invention, the angle between the connecting rod and the crankshaft gradually increases during the movement of the connecting rod in the upper half area of the large gear. Therefore, the force arm becomes longer, and it is easier for the large gear to apply the work done to the connecting rod. As a result, the rotation speed of the connecting rod driving the crankshaft increases, the rotation amplitude of the hammer head shaft increases, and the rising speed of the connecting rod and the saw teeth also increases. Conversely, when the crankshaft and the connecting rod are moving in the lower half area of the large gear, the angle between the crankshaft and the connecting rod becomes smaller, the force arm becomes shorter, and the descending speed of the connecting rod and the saw teeth slows down, reducing the stamping speed of the stamping die (not shown) on the saw teeth and improving the processing accuracy of the device for precision parts and the product quality control.

[0014] 2. During the rotation of the first turntable of the present invention, the first turntable rotates in place on the fixed seat. At the same time, the rotation of the first turntable drives the threaded bar to slide inside the abutment cavity in the installation groove. When the installation groove moves at one end of the connecting rod, it moves away from the connecting shaft between the connecting rod and the crankshaft. During the movement of the connecting rod, the connecting shaft between the connecting rod and the crankshaft gradually presses the shaft cover. As a result, the first spring is compressed, and at the same time, the shaft cover reversely drives the installation groove to move outward from the connecting rod, bringing one end inside the abutment cavity into contact with the end of the threaded bar, causing the threaded bar to block the abutment cavity. Therefore, after the first turntable rotates, the depth of the threaded bar inside the installation groove can be adjusted to control the transmission distance between the connecting rod and the crankshaft, so that the device can achieve stepless transmission and the equipment can process various products. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Structural schematic diagram of the body housing of the present invention;

[0016] Figure 2 Structural schematic diagram of the internal transmission structure of the body of the present invention;

[0017] Figure 3 Another perspective schematic diagram of the internal transmission structure of the body of the present invention;

[0018] Figure 4 Structural schematic diagram of the crankshaft and the connecting rod of the present invention;

[0019] Figure 5 Of the present invention Figure 4 Enlarged structural schematic diagram at A in;

[0020] Figure 6 Structural schematic diagram of the internal structure of the crankshaft and the hammer head shaft of the present invention;

[0021] Figure 7 Of the present invention Figure 6 Enlarged structural schematic diagram at B in;

[0022] Figure 8 Structural schematic diagram of the hammer head shaft and the crankshaft of the present invention;

[0023] Figure 9 This is a schematic diagram of the internal structure of the installation pin of the present invention.

[0024] In the figure: 1 - body; 101 - installation bushing; 2 - flywheel; 3 - transmission shaft; 4 - pinion gear; 5 - large gear; 6 - mounting disc; 7 - shaft seat; 8 - connecting rod; 9 - saw teeth; 10 - small disc shaft gear; 11 - main shaft gear; 12 - intermediate gear; 13 - crankshaft; 1301 - tangential keyway; 14 - pull rod; 15 - transposition hole; 16 - fixed position; 17 - shaft cover; 18 - first spring; 19 - fixed seat; 20 - first turntable; 21 - installation groove; 22 - threaded bar; 23 - abutment cavity; 24 - hammer head shaft; 25 - wheel speed detector; 26 - guide rail; 27 - installation pin; 28 - rotating rod; 29 - diverter; 30 - fixing piece; 31 - second spring; 32 - contact force rod; 33 - internal threaded rod; 34 - external threaded rod; 35 - magnetic head block; 36 - wedge block; 37 - second turntable. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of 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 of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to Figures 1-9 , the present invention provides a technical solution: a variable-speed punching machine driven by a cam-type connecting rod, including a body 1, an installation bushing 101 is arranged on the body 1, a shaft seat 7 is fixedly installed on the installation bushing 101, a hammer head shaft 24 is rotatably connected to the shaft seat 7, a large gear 5 is rotatably connected to the hammer head shaft 24, a mounting disc 6 is fixedly installed on one side of the large gear 5, one end of the hammer head shaft 24 is detachably connected to a crankshaft 13, the other end of the hammer head shaft 24 is fixedly connected to a connecting rod 8, a saw tooth 9 is fixedly connected to the bottom of the connecting rod 8, a transmission shaft 3 is rotatably connected inside the body 1, a pinion gear 4 is fixedly installed at one end of the transmission shaft 3, the pinion gear 4 and the large gear 5 are meshed and driven, the other end of the transmission shaft 3 is fixedly connected to a flywheel 2, the flywheel 2 is connected inside the body 1 through a belt, a fixed position 16 is arranged outside the crankshaft 13, a fixed shaft is installed on the fixed position 16, a pull rod 14 is installed on the fixed shaft, the pull rod 14 and the large gear 5 are detachably connected together, and an installation pin 27 is detachably connected between the crankshaft 13 and the hammer head shaft 24.

[0027] First, the axle seat 7 is installed on the mounting bushing 101. There is a bushing (not shown in the existing structure) inside the body 1 for installing the large gear 5. A belt is sleeved on the flywheel 2 for transmission. When the flywheel 2 rotates, the transmission shaft 3 rotates, and then the small gear 4 rotates. When the small gear 4 rotates, it drives the large gear 5 to rotate. It is worth mentioning that in the appendix Figure 2 In the process of the small gear 4 driving the large gear 5 to rotate, (observed from the right view), the large gear 5 rotates counterclockwise, so the small gear 4 rotates clockwise. The large gear 5 can drive the drawbar 14 to rotate counterclockwise. When a force is applied to one end of the drawbar 14, the drawbar 14 can pull the crankshaft 13 to rotate. When the crankshaft 13 rotates, it drives the hammer shaft 24 to rotate in place on the body 1. Therefore, when the hammer shaft 24 rotates, it drives the connecting rod 8 and the saw teeth 9 to move up and down. When the crankshaft 13 rotates, (also observed from the right view), when the crankshaft 13 and the drawbar 14 move in the upper half region of the axis of the large gear 5, the hammer shaft 24 is in the rising process. If the crankshaft 13 and the drawbar 14 move in the lower half region of the axis of the large gear 5, the hammer shaft 24 is in the descending process. As shown in the appendix Figure 3 When the large gear 5 rotates counterclockwise, the angle between the drawbar 14 and the crankshaft 13 gradually increases during the movement of the drawbar 14 in the upper half region of the large gear 5. Therefore, the force arm becomes longer, and it is easier for the large gear 5 to apply the work done on the drawbar 14. Therefore, the speed of the drawbar 14 driving the crankshaft 13 to rotate increases, so the amplitude of the rotation of the hammer shaft 24 increases, and thus the rising speed of the connecting rod 8 and the saw teeth 9 increases. Conversely, when the crankshaft 13 and the drawbar 14 move in the lower half region of the large gear 5, the angle between the crankshaft 13 and the drawbar 14 becomes smaller, and the force arm becomes shorter. Therefore, the descending speed of the connecting rod 8 and the saw teeth 9 slows down, reducing the stamping speed of the stamping die (not shown) on the saw teeth 9 and improving the processing accuracy of the equipment for precision parts and the product quality control.

[0028] Further, a fixing seat 19 is fixedly installed outside one end of the traction rod 14. One end of the fixing seat 19 is rotatably connected to a first turntable 20. A thread is provided on the inner ring of the first turntable 20. An installation groove 21 is slidably connected to the inner ring of the first turntable 20. A contact cavity 23 is provided in the installation groove 21. A thread bar 22 is movably connected in the contact cavity 23. The inner ring of the first turntable 20 is in cooperation with the thread bar 22 through the thread. One end of the installation groove 21 extends into the traction rod 14. An axle cap 17 is fixedly installed at the end of the installation groove 21. A plurality of first springs 18 are fixedly installed between the axle cap 17 and the traction rod 14; when the stamping materials are different, during the factory production process, it is necessary to adjust the speed of the machine body 1 to ensure the smooth operation of the front and back technological processes. Therefore, in this embodiment, the rear machine cover of the machine body 1 is opened manually, and then the first turntable 20 is rotated manually. When the first turntable 20 rotates, the first turntable 20 rotates in place on the fixing seat 19. At the same time, the rotation of the first turntable 20 drives the thread bar 22 to slide inside the contact cavity 23 of the installation groove 21. When the installation groove 21 moves at one end of the traction rod 14, it moves away from the connecting shaft between the traction rod 14 and the crankshaft 13. During the movement of the traction rod 14, the connecting shaft between the traction rod 14 and the crankshaft 13 gradually presses the axle cap 17. Therefore, the first spring 18 is compressed. At the same time, the axle cap 17 reversely drives the installation groove 21 to move outside the traction rod 14, so that one end inside the contact cavity 23 contacts the end of the thread bar 22, and the thread bar 22 blocks the contact cavity 23. Therefore, after the first turntable 20 rotates, the depth of the thread bar 22 inside the installation groove 21 can be adjusted to control the transmission distance between the traction rod 14 and the crankshaft 13, so that the device can achieve stepless transmission and the equipment can process various products; at the same time, the first spring 18 can reduce the overall vibration.

[0029] Further, a plurality of conversion holes 15 are annularly distributed on the large gear 5, and the distance between adjacent two of the conversion holes 15 is equal. The provision of a plurality of conversion holes 15 on the large gear 5 allows one end of the traction rod 14 to be exchanged to different conversion holes 15, realizing a large range of adjustment of the punching machine speed. There is a distance between each of the conversion holes 15. Therefore, the transmission distance between the traction rod 14 and the crankshaft 13 becomes longer or shorter. Combined with manually rotating the first turntable 20 as described above, the precision of the stepless speed regulation of the punching machine can be made more precise, improving the performance of the punching machine itself.

[0030] Furthermore, a small plate shaft gear 10 is rotatably connected inside the body 1, a main shaft gear 11 is fixedly installed on one side of the flywheel 2, a transition gear 12 is transmission-connected between the main shaft gear 11 and the small plate shaft gear 10, a wheel speed detector 25 is fixedly installed at the cross section of one end of the hammer shaft 24, and the shaft of the small plate shaft gear 10 passes through the inner ring of the wheel speed detector 25; a rotating rod 28 is rotatably connected to the wheel speed detector 25, and at least two dividers 29 are fixedly connected to the rotating rod 28, and the divider 29 includes a fixing ring arranged on the rotating rod 28, and a plurality of extension rods installed on the fixing ring, and one end of each of the extension rods and the outer ring of the touch rod 32 are connected by The touch rod 32 and the extension rod are both made of rigid materials; the inside of the hammer shaft 24 and the guide rail 26 are fixedly installed with a fixing plate 30, each of the fixing plates 30 is movably connected with a touch rod 32, and a second spring 31 is fixedly connected between the touch rod 32 and the fixing plate 30, and the rotating rod 28 and the small plate shaft gear 10 are coaxially connected together; the inner ring of the crankshaft 13 is provided with an involvement keyway 1301, and the installation pin 27 is slidably connected with the involvement keyway 1301; the installation pin 27 is made of iron, and when the divider 29 rotates, the sliding distance of the installation pin 27 on the guide rail 26 does not exceed the outside of the hammer shaft 24;

[0031] In summary, although the crankshaft 13 and the connecting rod 14 can adjust the punching speed of the punching machine, it further causes problems with the counterweight of the large gear 5. When the machine is shut down for maintenance or in case of an emergency stop, the connecting rod 8 and the saw tooth 9 are exactly in the rising process. Although assisted by the braking system, the connecting rod 8 and the saw tooth 9 are heavy and have a large downward punching energy, and it is difficult for them to stop immediately. At this time, the crankshaft 13 and the connecting rod 14 on one side of the large gear 5 will impose a burden on the large gear 5 and generate stress between the hammer head shaft 24 and the large gear 5. Over time, stress concentration is likely to occur at the shaft part, and it will cause significant damage to the shaft part after a long time. Therefore, to further solve the problem, when the flywheel 2 rotates, the main shaft gear 11 fixed on the flywheel 2 rotates. The rotation of the main shaft gear 11 drives the intermediate gear 12 to rotate, and the rotation of the intermediate gear 12 further causes the small disc shaft gear 10 to rotate. When the small disc shaft gear 10 rotates, the rotating rod 28 can be rotated. The rotating direction of the rotating rod 28 is opposite to that of the crankshaft 13. The rotation of the rotating rod 28 causes the two distributors 29 to contact the contact lever 32. The contact lever 32 is sleeved with a second spring 31. After the second spring 31 is compressed, the other end of the contact lever 32 drives the mounting pin 27 to slide on the guide rail 26, so that the mounting pin 27 slides to the connection between the engagement key groove 1301 and the hammer head shaft 24, enabling the large gear 5 to drive the connecting rod 14 to rotate. The connecting rod 14 can drive the crankshaft 13 to rotate while causing the hammer head shaft 24 to rotate. When the machine is shut down for maintenance or in case of an emergency stop, the flywheel 2 immediately stops rotating, and the second spring 31 resets, thereby causing the mounting pin 27 to reset. The mounting pin 27 is slidably and detachably connected to the other end of the contact lever 32, causing the mounting pin 27 to disengage from the engagement key groove 1301, cutting off the power between the crankshaft 13 and the hammer head shaft 24, preventing the large gear 5 from driving the crankshaft 13 to rotate. The powerless crankshaft 13 will, under the action of gravity, slowly drive the large gear 5 to rotate in the reverse direction during the shutdown process and return to the lowest point position, as shown in the appendix Figure 3 As shown, during the restart process of the equipment, by idling the flywheel 2 for one full turn, the other end of the contact lever 32 drives the mounting pin 27 to slide on the guide rail 26, and when the mounting pin 27 coincides with the engagement key groove 1301, the hammer head shaft 24 can be rotated;

[0032] Further, one end of the mounting pin 27 is rotatably connected to a second turntable 37. A threaded inner rod 33 is fixedly installed on one side of the second turntable 37. A threaded outer rod 34 is threadedly connected inside the threaded inner rod 33. A magnetic head block 35 is fixedly installed at one end of the threaded outer rod 34. Wedge blocks 36 are movably connected to both sides of the other end of the mounting pin 27. The magnetic head block 35 and the wedge blocks 36 are magnetically attracted to each other, and the inclined surfaces of the magnetic head block 35 and the wedge blocks 36 are in conformity. During the process of installing the mounting pin 27 onto the guide rail 26, one end of the mounting pin 27 can be directly inserted onto the guide rail 26 manually, and then the second turntable 37 is rotated manually to make the threaded outer rod 34 linearly move inside the threaded inner rod 33, so that the magnetic head block 35 at one end of the threaded outer rod 34 presses the wedge blocks 36 up and down, causing the wedge blocks 36 to protrude outwards and slide along the guide rail 26, thereby realizing the installation or disassembly of the mounting pin 27.

[0033] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A variable-speed punching machine driven by a cam-type connecting rod, comprising a machine body (1), and an installation bushing (101) is arranged on the machine body (1), and is characterized in that: The mounting sleeve (101) is fixedly mounted with a shaft seat (7), the shaft seat (7) is rotatably connected with a hammer shaft (24), the hammer shaft (24) is rotatably connected with a large gear (5), a mounting plate (6) is fixedly mounted on one side of the large gear (5), one end of the hammer shaft (24) is detachably connected with a crankshaft (13), the other end of the hammer shaft (24) is fixedly connected with a connecting rod (8), the bottom of the connecting rod (8) is fixedly connected with a saw tooth (9), the body (1) is internally rotatably connected with a transmission shaft (3), the transmission shaft (3) is A pinion (4) is fixedly mounted on one end of the crankshaft (13), the pinion (4) and the large gear (5) are meshed for transmission, the other end of the transmission shaft (3) is fixedly connected to a flywheel (2), the flywheel (2) is connected to the inside of the machine body (1) via a belt, a fixing position (16) is provided on the outside of the crankshaft (13), a fixing shaft is mounted on the fixing position (16), a pull rod (14) is mounted on the fixing shaft, the pull rod (14) and the large gear (5) are detachably connected together, and a mounting pin (27) is detachably connected between the crankshaft (13) and the hammer shaft (24); The large gear (5) has a plurality of transposition holes (15) distributed in an annular shape, and the distance between two adjacent transposition holes (15) is equal; A small plate shaft gear (10) is rotatably connected inside the machine body (1), a main shaft gear (11) is fixedly mounted on one side of the flywheel (2), a transition gear (12) is transmission-connected between the main shaft gear (11) and the small plate shaft gear (10), a wheel speed detector (25) is fixedly mounted at a cross section at one end of the hammer shaft (24), and the shaft of the small plate shaft gear (10) passes through the inner ring of the wheel speed detector (25); The wheel speed detector (25) is rotatably connected to a rotating rod (28), and at least two dividers (29) are fixedly connected to the rotating rod (28). Fixed plates (30) are fixedly installed inside the hammer shaft (24) and on the guide rail (26). Each of the fixed plates (30) is movably connected to a force rod (32). A second spring (31) is fixedly connected between the force rod (32) and the fixed plate (30). The rotating rod (28) and the small plate shaft gear (10) are coaxially connected together. The inner ring of the crankshaft (13) is provided with a connecting keyway (1301), and the mounting pin (27) is slidably connected to the connecting keyway (1301); The distributor (29) comprises a fixed ring arranged on the rotating rod (28), and a plurality of extension rods mounted on the fixed ring, one end of each extension rod and the outer ring of the contact rod (32) are chamfered, and the contact rod (32) and the extension rod are both made of rigid material.

2. The variable-speed punching machine driven by a cam-type connecting rod according to claim 1, characterized in that: A fixing seat (19) is fixedly installed on the outside of one end of the pulling rod (14), and a first rotating disk (20) is rotatably connected to one end of the fixing seat (19). The inner ring of the first rotating disk (20) is provided with a thread, and the inner ring of the first rotating disk (20) is slidably connected to a mounting groove (21). A resistance cavity (23) is provided on the mounting groove (21), and a threaded strip (22) is movably connected in the resistance cavity (23). The inner ring of the first rotating disk (20) cooperates with the threaded strip (22), and one end of the mounting groove (21) extends into the pulling rod (14). A shaft cover (17) is fixedly installed at the end of the mounting groove (21), and a plurality of first springs (18) are fixedly installed between the shaft cover (17) and the pulling rod (14).

3. The variable-speed punching machine driven by a cam-type connecting rod according to claim 1, characterized in that: One end of the mounting pin (27) is rotatably connected to a second turntable (37); one side of the second turntable (37) is fixedly mounted with an internal threaded rod (33); the internal thread of the internal threaded rod (33) is threadedly connected to an external threaded rod (34); one end of the external threaded rod (34) is fixedly mounted with a magnetic head block (35); and both sides of the other end of the mounting pin (27) are movably connected to wedge blocks (36); the magnetic head block (35) and the wedge block (36) are connected together by magnetic attraction, and the inclined surfaces of the magnetic head block (35) and the wedge block (36) match each other.

4. A variable-speed punching press driven by a cam-type connecting rod according to claim 1, characterized in that: The mounting pin (27) is made of iron, and when the distributor (29) rotates, the sliding distance of the mounting pin (27) on the guide rail (26) does not exceed the outside of the hammer shaft (24).

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