Variable-speed punching machine driven by cam type connecting rod

Abstract

The invention relates to the technical field of punching machines, and discloses a cam type connecting rod driven variable-speed punching machine which comprises a machine body, a mounting shaft sleeve is arranged on the machine body, a shaft seat is fixedly mounted on the mounting shaft sleeve, a hammer head shaft is rotationally connected to the shaft seat, a large gear is rotationally connected to the hammer head shaft, and a mounting disc is fixedly mounted on one side of the large gear; one end of the hammer shaft is detachably connected with a crankshaft, the other end of the hammer shaft is fixedly connected with a connecting rod, the bottom of the connecting rod is fixedly connected with saw teeth, a transmission shaft is rotationally connected to the interior of the machine body, one end of the transmission shaft is fixedly provided with a pinion, and the pinion and a large gear are in meshing transmission. By controlling the included angle between the crankshaft and the traction rod, the speed change of the connecting rod and the saw tooth is completed, the stamping speed of a stamping die on the saw tooth is slowed down, the machining precision of the equipment on precise parts is improved, and the product quality control is improved.

Description

Technical Field

[0001] The invention relates to the technical field of punching machines, in particular to a variable speed punching machine driven by a cam type connecting rod. Background Art

[0002] As we all know, the power of the punch press 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 hung on the large gear. The punch is provided with an upper die. The upper die presses down in the slideway to complete the punching action. Since there is only one main motor to control the entire pressing and return process, the pressing speed and the return speed are the same. When the sheet metal thickness of the stamped part is large, if the speed of the main motor is too fast, the burrs and steps of the parts will increase for the punching of precision parts, and the finish will not meet the requirements. If the speed output by the main motor is too slow, precision parts can be precisely stamped, but the return speed will be very slow. In the same time, the number of parts that can be processed is greatly reduced. In the design of the punch press, the traditional punch press connecting rod structure and drive structure have low production efficiency and low product quality control yield. For this reason, we propose a cold forging aluminum alloy forging manufacturing equipment. For this reason, we propose a variable speed punch press driven by a cam-type connecting rod. Summary of the invention

[0003] The object of the present invention is to provide a cam-type connecting rod driven variable speed punch press to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a cam-type connecting rod driven variable speed punch press, comprising a machine body, a mounting sleeve is provided on the machine body, a shaft seat is fixedly installed on the mounting sleeve, a hammer shaft is rotatably connected to the shaft seat, a large gear is rotatably connected to the hammer shaft, a mounting plate is fixedly installed on one side of the large gear, one end of the hammer shaft is detachably connected to a crankshaft, the other end of the hammer 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 to the inside of the machine body, a pinion is fixedly installed on one end of the transmission shaft, the pinion and the large gear are meshed for transmission, 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 fixed position is opened on the outside of the crankshaft, a fixed shaft is installed on the fixed position, a draw rod is installed on the fixed shaft, the draw rod and the large gear are detachably connected together, and a mounting pin is detachably connected between the crankshaft and the hammer shaft.

[0005] Preferably, a plurality of transposition holes are distributed in a ring shape on the large gear, and the distance between two adjacent transposition 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: 1. In the process of the large gear in the present invention rotating counterclockwise, the angle between the pull rod and the crankshaft gradually increases during the process of the pull rod moving in the upper half of the large gear, so the lever arm becomes longer, and the large gear is easier to work on the pull rod, so the speed of the pull rod driving the crankshaft to rotate becomes larger, so the amplitude of the hammer shaft rotation becomes larger, so the speed of the connecting rod and the saw teeth rising becomes larger, on the contrary, when the crankshaft and the pull rod move in the lower half of the large gear, the angle between the crankshaft and the pull rod becomes smaller, the lever arm becomes shorter, so the speed of the connecting rod and the saw teeth descending becomes slower, slowing down the stamping speed of the stamping die (not shown) on the saw teeth, improving the processing accuracy of the equipment for precision parts, and improving the quality control of the product; 2. During the rotation of the first turntable of the present invention, the first turntable is located on the fixed seat and rotates in place. At the same time, the rotation of the first turntable drives the threaded strip to slide inside the interference cavity in the installation groove, wherein the installation groove moves away from the connecting shaft between the pull rod and the crankshaft when one end of the pull rod moves. During the movement of the pull rod, the connecting shaft between the pull rod and the crankshaft gradually presses the shaft cover, so that the first spring is compressed, and at the same time, the shaft cover reversely drives the installation groove to move outside the pull rod, so that one end of the interference cavity contacts the end of the threaded strip, so that the threaded strip blocks the interference cavity. Therefore, after the first turntable rotates, the depth of the threaded strip inside the installation groove can be adjusted to adjust the transmission distance between the pull rod and the crankshaft, so that the device can realize stepless transmission, and the equipment can realize the processing of various products; BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the housing of the present invention; Figure 2 It is a schematic diagram of the internal transmission structure of the machine body of the present invention; Figure 3 It is a schematic diagram of another viewing angle of the internal transmission structure of the machine body of the present invention; Figure 4 It is a schematic diagram of the crankshaft and the pull rod structure of the present invention; Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure at A in the middle; Figure 6 It is a schematic diagram of the internal structure of the crankshaft and hammer shaft of the present invention; Figure 7 For the present invention Figure 6 A schematic diagram of the enlarged structure at B in the middle; Figure 8 It is a schematic diagram of the hammer shaft and crankshaft structure of the present invention; Fig. 9 It is a schematic diagram of the internal structure of the mounting pin of the present invention.

[0014] In the figure: 1-body; 101-installation sleeve; 2-flywheel; 3-transmission shaft; 4-small gear; 5-large gear; 6-installation plate; 7-shaft seat; 8-connecting rod; 9-saw teeth; 10-small plate shaft gear; 11-main shaft gear; 12-transition gear; 13-crankshaft; 1301-involvement 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 strip; 23-contact cavity; 24-hammer shaft; 25-wheel speed detector; 26-guide rail; 27-installation pin; 28-rotating rod; 29-divider; 30-fixed plate; 31-second spring; 32-touch rod; 33-inner threaded rod; 34-outer threaded rod; 35-head block; 36-wedge block; 37-second turntable. DETAILED DESCRIPTION

[0015] 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.

[0016] See also Figure 1-9 The present invention provides a technical solution: a cam-type connecting rod driven variable speed punch press, comprising a machine body 1, a mounting sleeve 101 is provided on the machine body 1, a shaft seat 7 is fixedly installed on the mounting sleeve 101, a hammer shaft 24 is rotatably connected to the shaft seat 7, a large gear 5 is rotatably connected to the hammer shaft 24, a mounting plate 6 is fixedly installed on one side of the large gear 5, one end of the hammer shaft 24 is detachably connected to a crankshaft 13, the other end of the hammer shaft 24 is fixedly connected to a connecting rod 8, and 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 4 is fixedly installed at one end of the transmission shaft 3, 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 body 1 through a belt, a fixing position 16 is opened outside the crankshaft 13, a fixing shaft is installed on the fixing position 16, a pull rod 14 is installed 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.

[0017] First, the shaft seat 7 is installed on the mounting sleeve 101, wherein the body 1 is provided with a sleeve for mounting the large gear 5 (the existing structure is not shown), wherein the flywheel 2 is sleeved with a belt for transmission, and when the flywheel 2 rotates, the transmission shaft 3 rotates, thereby rotating the small gear 4, and when the small gear 4 rotates, the large gear 5 is driven to rotate. It is worth mentioning that in the attached Figure 2 In the process of the pinion 4 driving the large gear 5 to rotate, (observed from the right view), the large gear 5 is in counterclockwise rotation, so the pinion 4 is in clockwise rotation, and the large gear 5 can drive the tie rod 14 to rotate counterclockwise, wherein in the process of force on one end of the tie rod 14, the tie rod 14 can pull the crankshaft 13 to rotate, and the rotation of the crankshaft 13 drives the hammer head shaft 24 to rotate in place on the body 1, so the hammer head shaft 24 drives the connecting rod 8 and the saw tooth 9 to move up and down during the rotation of the crankshaft 13, wherein (also observed from the right view) when the crankshaft 13 and the tie rod 14 move in the upper half area of ​​the axis of the large gear 5, the hammer head shaft 24 is in the process of rising, if the crankshaft 13 and the tie rod 14 move in the lower half area of ​​the axis of the large gear 5, the hammer head shaft 24 is in the process of descending, wherein as shown in the attached Figure 3 As shown, when the large gear 5 rotates counterclockwise, the angle between the pull rod 14 and the crankshaft 13 gradually increases during the activity in the upper half of the large gear 5, so the lever arm becomes longer, and the large gear 5 can more easily perform the work on the pull rod 14. Therefore, the speed at which the pull rod 14 drives the crankshaft 13 to rotate becomes faster, so the rotation amplitude of the hammer shaft 24 becomes larger, so the rising speed of the connecting rod 8 and the saw tooth 9 becomes larger. On the contrary, when the crankshaft 13 and the pull rod 14 move in the lower half of the large gear 5, the angle between the crankshaft 13 and the pull rod 14 becomes smaller, and the lever arm becomes shorter. Therefore, the descending speed of the connecting rod 8 and the saw tooth 9 becomes slower, which slows down the stamping speed of the stamping die (not shown) on the saw tooth 9, improves the processing accuracy of the equipment for precision parts, and improves the quality control of the product.

[0018] Furthermore, a fixing seat 19 is fixedly installed on the outside of one end of the pull rod 14, and a first turntable 20 is rotatably connected to one end of the fixing seat 19. The inner ring of the first turntable 20 is provided with a thread, and the inner ring of the first turntable 20 is slidably connected with a mounting groove 21, and a resistance cavity 23 is provided on the mounting groove 21. A threaded strip 22 is movably connected in the resistance cavity 23. The inner ring of the first turntable 20 cooperates with the threaded strip 22 through the thread, and one end of the mounting groove 21 extends into the pull 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 pull rod 14. When the stamping materials are different, the machine body 1 needs to be speed-regulated during the factory production process to ensure that the front and rear process flows can run smoothly. Therefore, in this embodiment, the rear cover of the machine body 1 is opened manually, and then the first turntable 20 is manually rotated. When the first turntable 20 rotates, the first turntable The disk 20 is located on the fixed seat 19 and rotates in place. At the same time, the rotation of the first rotating disk 20 drives the threaded strip 22 to slide inside the interference cavity 23 in the installation groove 21. When the installation groove 21 moves at one end of the pull rod 14, it moves away from the connecting shaft between the pull rod 14 and the crankshaft 13. During the movement of the pull rod 14, the connecting shaft between the pull rod 14 and the crankshaft 13 gradually presses the shaft cover 17, so that the first spring 18 is compressed. At the same time, the shaft cover 17 reversely drives the installation groove 21 to move outside the pull rod 14, so that one end of the interference cavity 23 contacts the end of the threaded strip 22, so that the threaded strip 22 blocks the interference cavity 23. Therefore, after the first rotating disk 20 rotates, the depth of the threaded strip 22 inside the installation groove 21 can be adjusted to adjust the transmission distance between the pull rod 14 and the crankshaft 13, so that the device can achieve stepless transmission and the equipment can realize the processing of various products; at the same time, the first spring 18 can reduce the overall vibration.

[0019] Furthermore, the large gear 5 is provided with a plurality of transposition holes 15 distributed in a ring shape, and the distance between two adjacent transposition holes 15 is equal. The large gear 5 has a plurality of transposition holes 15, so that one end of the pull rod 14 can be exchanged for different transposition holes 15, thereby realizing a wide range of speed adjustment of the punch press. There is a distance between each transposition hole 15, so that the transmission distance between the pull rod 14 and the crankshaft 13 becomes longer or shorter. Combined with the above-mentioned manual rotation of the first turntable 20, the progress of the stepless speed regulation of the punch press can be made more precise, thereby improving the performance of the punch press itself.

[0020] 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; To sum up, although the crankshaft 13 and the pull rod 14 can adjust the speed of the punch press, it further causes problems with the counterweight of the large gear 5. If the machine is shut down for maintenance or an emergency stop is encountered, the connecting rod 8 and the saw tooth 9 are in the process of rising. Although there is the assistance of the brake system, the connecting rod 8 and the saw tooth 9 are of large mass and have a large downward impact energy. It is difficult for the connecting rod 8 and the saw tooth 9 to stop for a while. At this time, the crankshaft 13 and the pull rod 14 are located on one side of the large gear 5, which will put 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 prone to occur in the shaft, which will cause considerable damage to the shaft over time. Therefore, in order to further solve the problem, when the flywheel 2 rotates, the main shaft gear 11 fixed on the flywheel 2 rotates, and the rotation of the main shaft gear 11 drives the transition gear 12 to rotate, and the transition gear 1 2 rotates, thereby causing the small plate shaft gear 10 to rotate. When the small plate shaft gear 10 rotates, the rotating rod 28 can be rotated. The rotating rod 28 and the crankshaft 13 rotate in opposite directions. The rotating rod 28 rotates so that the two dividers 29 contact the touch rod 32. The touch rod 32 is sleeved with the second spring 31 on the outside. After the second spring 31 is compressed, the other end of the touch rod 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 key slot 1301 and the hammer shaft 24, so that the large gear 5 can drive the pull rod 14 to rotate. The pull rod 14 can drive the crankshaft 13 to rotate while causing the hammer shaft 24 to rotate. When the machine is shut down for maintenance or encounters an emergency stop, the flywheel 2 stops rotating immediately, and the second spring 31 is reset, thereby causing the mounting pin 27 to reset. The mounting pin 27 and the other end of the force rod 32 are slidably and detachably connected, so that the mounting pin 27 is separated from the key slot 1301, so that the power between the crankshaft 13 and the hammer shaft 24 is cut off, so that the large gear 5 cannot drive the crankshaft 13 to rotate. The crankshaft 13 without power will slowly pull the large gear 5 to rotate in the reverse direction under the action of gravity during the shutdown process, and fall back to the lowest point, as shown in the attached figure. Figure 3 As shown, when the device is restarted, the flywheel 2 is rotated for one circle, so that the other end of the contact rod 32 drives the mounting pin 27 to slide on the guide rail 26, so that the mounting pin 27 and the involved key slot 1301 overlap, and the hammer shaft 24 can be rotated; Furthermore, one end of the mounting pin 27 is rotatably connected to a second turntable 37, one side of the second turntable 37 is fixedly installed with an internal threaded rod 33, the internal threaded rod 33 is threadedly connected to an external threaded rod 34, one end of the external threaded rod 34 is fixedly installed with a magnetic head block 35, and the other end of the mounting pin 27 is movably connected to wedge blocks 36 on both sides, 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. In the process of installing the mounting pin 27 on the guide rail 26, one end of the mounting pin 27 can be directly inserted into the guide rail 26 manually, and then the second turntable 37 can be manually rotated to make the external threaded rod 34 move linearly inside the internal threaded rod 33, so that the magnetic head block 35 at one end of the external threaded rod 34 squeezes the wedge block 36 up and down, and the wedge block 36 extends outward to slide along the guide rail 26, thereby achieving installation or removal of the mounting pin 27.

[0021] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0022] 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 cam-type connecting rod driven variable speed punch press, comprising a machine body (1), wherein a mounting sleeve (101) is provided on the machine body (1), and wherein: 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).

2. A cam-type connecting rod driven variable speed punch press according to claim 1, characterized in that: The large gear (5) is provided with a plurality of transposition holes (15) distributed in an annular shape, and the distance between two adjacent transposition holes (15) is equal.

3. The cam-type connecting rod driven variable speed punch press 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).

4. The cam-type connecting rod driven variable speed punch press according to claim 1, characterized in that: A small disc 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 disc 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 disc shaft gear (10) passes through an inner ring of the wheel speed detector (25).

5. A cam-type connecting rod driven variable speed punch press according to claim 4, characterized in that: 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).

6. A cam-type connecting rod driven variable speed punch press according to claim 5, 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.

7. The cam-type connecting rod driven variable speed punch press according to claim 5, characterized in that: 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.

8. The cam-type connecting rod driven variable speed punch press according to claim 5, 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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