Main drive mechanism of cold heading machine

Abstract

The present invention relates to the technical field of cold heading forming machines, and particularly to the main drive mechanism of a cold heading forming machine, which includes a belt pulley, a synchronous belt, a flywheel, and a crankshaft. The two ends of the synchronous belt are respectively sleeved on the belt pulley and the flywheel, and the crankshaft is installed on the flywheel. The crankshaft is composed of a connecting shaft, a connecting block, and a middle shaft. There are two connecting shafts and two connecting blocks. The end parts of the two connecting shafts are respectively fixedly connected to one end of the two connecting blocks, and the middle shaft sequentially passes through the two connecting blocks. Hemispherical convex rings are uniformly fixed on the outer surface of the middle shaft, and a collapsible bearing is sleeved at the hemispherical convex ring of the middle shaft. The middle shaft is rotatably connected to the connecting block through the collapsible bearing. By sliding the middle shaft to adjust the connection position with the collapsible bearing, the impact point position of the crankshaft can be changed, avoiding repeated impact on a certain point of the crankshaft, which may cause metal fatigue deformation or fracture, thereby improving the service life of the crankshaft.

Description

Technical Field

[0001] The present invention relates to the technical field of cold heading forming machines, and particularly to the main drive mechanism of a cold heading forming machine. Background Art

[0002] A cold heading forming machine is a device that uses the cold heading process to form metal parts such as screws, nuts, and rivets. The cold heading machine mainly consists of components such as a machine body, a motor, a main slider component, a crankshaft drive mechanism, a blanking mechanism, a feeding mechanism, and a female die mechanism. Among them, the crankshaft drive mechanism, also known as the main drive mechanism, is responsible for transmitting the power output by the motor to each component.

[0003] The main drive mechanism mainly consists of a flywheel and a crankshaft. In this regard, Chinese Patent Publication No. CN201632574U discloses a main drive mechanism of a cold heading forming machine, characterized in that: the main drive mechanism of the cold heading forming machine includes a crankshaft, a main motor, and a frequency converter. An air clutch is provided at the shaft end of the crankshaft. A flywheel is connected to the air clutch, and the flywheel is drivingly connected to the main motor, and the main motor is controlled by the frequency converter.

[0004] Its motor drives the flywheel to rotate through the cooperation of a belt pulley and a synchronous belt, and then drives the crankshaft to rotate through the flywheel. Since the main slider component performs cold heading by driving the forward and backward movement of the crankshaft, during the forward and backward movement of the crankshaft, it will be subjected to the impact force brought by the main slider component hitting the female die mechanism. Therefore, extremely high requirements are imposed on the strength of the crankshaft. However, the main material of the crankshaft is metal, and metals all have fatigue. Repeatedly impacting the same point of the crankshaft will, over time, cause the crankshaft to deform or even break. Currently, the main drive mechanism of the cold heading forming machine cannot conveniently change the impact position of the crankshaft, affecting the service life of the crankshaft. Summary of the Invention

[0005] In view of the above-mentioned drawbacks of the prior art, the present invention provides a main drive mechanism of a cold heading forming machine, which can effectively solve the problem that the current main drive mechanism of the cold heading forming machine in the prior art cannot conveniently change the impact position of the crankshaft, affecting the service life of the crankshaft.

[0006] To achieve the above object, the present invention is realized through the following technical solutions: facilitating the change of the impact point position of the crankshaft and improving the service life of the crankshaft.

[0007] The present invention provides a main drive mechanism for a cold heading forming machine, which includes a belt pulley, a synchronous belt, a flywheel and a crankshaft. Both ends of the synchronous belt are respectively sleeved on the belt pulley and the flywheel, and the crankshaft is installed on the flywheel. It is characterized in that the crankshaft is composed of a connecting shaft, a connecting block and a middle shaft. There are two connecting shafts and two connecting blocks. The end parts of the two connecting shafts are respectively fixedly connected to one end of the two connecting blocks, and the middle shaft sequentially passes through the two connecting blocks. Hemispherical convex rings are uniformly fixed on the outer surface of the middle shaft, and a retractable bearing is sleeved at the hemispherical convex ring of the middle shaft. The middle shaft is rotatably connected to the connecting block through the retractable bearing. The retractable bearing includes an outer shaft ring, and an inner ring is movably connected inside the outer shaft ring. The inner ring is composed of a plurality of double ball head rollers evenly distributed in a ring shape. A support ring is arranged inside the inner ring. The outer peripheral surface of the support ring abuts against the double ball head rollers, and the inner peripheral surface of the support ring abuts against the inner wall of the outer shaft ring. Retaining frames for limiting the double ball head rollers are arranged on both sides of the inner ring.

[0008] Further, a connecting seat is rotatably connected to the middle shaft through a retractable bearing, and a mounting seat is fixed at the end of the connecting seat away from the middle shaft.

[0009] Further, one end of the first connecting shaft away from the connecting block is coaxially and fixedly connected to the flywheel, and a reciprocating drive mechanism for driving the middle shaft to translate is arranged at the end of the second connecting shaft away from the connecting block.

[0010] Further, the reciprocating drive mechanism is composed of a sliding component, a transmission component and a driving component. The sliding component is composed of a first support plate, a sliding frame and a shifting rod. The sliding frame is slidably connected to the first support plate. There are two shifting rods, and the two shifting rods are distributed at both ends of the middle shaft, and both of the two shifting rods are rotatably connected to the sliding frame. The driving component is linked to the sliding frame through the transmission component.

[0011] Further, the transmission component is composed of a first push-pull block, a first connecting rod, a first push-pull rod, a second connecting rod, a connecting rod and a transmission component mounting seat. The two ends of the first push-pull rod are respectively rotatably connected to the end parts of the first connecting rod and the connecting rod, and the ends of the first connecting rod and the connecting rod away from the first push-pull rod are respectively rotatably connected to the end parts of the first push-pull block and the transmission component mounting seat, and the transmission component mounting seat is fixed to the bottom of the sliding frame by bolts.

[0012] Further, the driving assembly is composed of a second support plate, a driving gear, a driven gear, a second push rod, a cam, a dial block, a third connecting rod, and a second push block. Both the first push block and the second push block are slidably connected to the second support plate. The side surface of the first push rod is rotatably connected to the second support plate. The driving gear is sleeved and fixed on one end of the second connecting shaft away from the connecting block. There are two driven gears, two second push rods, and two cams. The two driven gears are distributed on both sides of the driving gear, and both driven gears mesh with the driving gear. The two cams are distributed at both ends of the dial block. The axes of the two driven gears and the two cams are rotatably connected to the second support plate. The two ends of the two second push rods are respectively rotatably connected to the two driven gears and the two cams. The two ends of the third connecting rod are respectively rotatably connected to the dial block and the second push block. The side surface of the dial block away from the third connecting rod is rotatably connected to the second support plate. The end of the second push block away from the third connecting rod is slidably connected to the first push block. The connection between the second push block and the first push block is wedge-shaped, and the inner cavity shape of the first push block fits the shape of the connection with the second push block.

[0013] Further, the cross-section of the support ring is arc-shaped, and the outer surface of the support ring is evenly provided with notches. The notches are triangular, and a plurality of notches are arranged in two rows in a circular pattern, and the two rows of notches are arranged staggeredly.

[0014] Further, clamping grooves are formed on both sides of the inner wall of the outer shaft ring, and the two cage retainers are respectively clamped with the two clamping grooves.

[0015] The technical solution provided by the present invention has the following beneficial effects compared with the known public technology:

[0016] Through the split design, the crankshaft is divided into three parts: a connecting shaft, a connecting block, and a middle shaft. The middle shaft can rotate in the middle shaft through the expandable bearing, and the middle shaft can also slide in the expandable bearing. By sliding the middle shaft to adjust the connection position with the expandable bearing, the impact point of the crankshaft can be changed, avoiding repeated impact on a certain point of the crankshaft, resulting in metal fatigue deformation or fracture, thereby improving the service life of the crankshaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic top view of the structure of the present invention;

[0020] Figure 3 It is the structure of the present invention Figure 1 Schematic sectional view taken along line A-A in the structure;

[0021] Figure 4 It is the structure of the present invention Figure 3 Enlarged schematic view at position B in the structure;

[0022] Figure 5 It is the structure of the present invention Figure 3 Overall schematic view of the retractable bearing in the structure;

[0023] Figure 6 It is the structure of the present invention Figure 5 Overall schematic view of the support ring in the structure;

[0024] Figure 7 It is the structure of the present invention Figure 1 Exploded schematic view of the crankshaft in the structure;

[0025] Figure 8 Partial exploded schematic view of the structure of the present invention;

[0026] Figure 9 It is the structure of the present invention Figure 8 Overall schematic view of the reciprocating drive mechanism in the structure;

[0027] Figure 10 It is the structure of the present invention Figure 9 Overall schematic view of the second connecting rod and the connecting rod in the structure.

[0028] The reference numerals in the figure respectively represent: 1, pulley; 2, timing belt; 3, flywheel; 4, crankshaft; 41, connecting shaft; 42, connecting block; 43, middle shaft; 5, retractable bearing; 51, outer race; 52, double ball head roller; 53, support ring; 54, cage; 6, mounting seat; 7, connecting seat; 8, reciprocating drive mechanism; 81, sliding assembly; 811, first support plate; 812, carriage; 813, lever; 82, transmission assembly; 821, first push-pull block; 822, first connecting rod; 823, first push-pull rod; 824, second connecting rod; 825, connecting rod; 83, drive assembly; 831, second support plate; 832, driving gear; 833, driven gear; 834, second push-pull rod; 835, cam; 836, lever; 837, third connecting rod; 838, second push-pull block. Detailed implementation manners

[0029] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] The present invention will be further described below with reference to the embodiments.

[0031] Embodiment: The main drive mechanism of a cold heading forming machine includes a belt pulley 1, a synchronous belt 2, a flywheel 3 and a crankshaft 4. Both ends of the synchronous belt 2 are respectively sleeved on the belt pulley 1 and the flywheel 3, the crankshaft 4 is installed on the flywheel 3, the belt pulley 1 can drive the flywheel 3 to rotate through the synchronous belt 2, and the flywheel 3 can drive the crankshaft 4 to rotate.

[0032] As Figure 1 and Figure 7 shown, the crankshaft 4 is composed of a connecting shaft 41, a connecting block 42 and a middle shaft 43. There are two connecting shafts 41 and two connecting blocks 42. The end parts of the two connecting shafts 41 are respectively fixedly connected to one end of the two connecting blocks 42, and the middle shaft 43 sequentially passes through the two connecting blocks 42, which is conducive to adjusting the connection position between the middle shaft 43 and the two connecting blocks 42, thereby changing the point where the middle shaft 43 is impacted;

[0033] In order to ensure the connection stability between the middle shaft 43 and the connecting block 42 after the position of the middle shaft 43 is adjusted, hemispherical convex rings are uniformly fixed on the outer surface of the middle shaft 43, and a retractable bearing 5 is sleeved at the hemispherical convex ring of the middle shaft 43. The middle shaft 43 is rotationally connected to the connecting block 42 through the retractable bearing 5. The retractable bearing 5 includes an outer race 51, and an inner ring is movably connected inside the outer race 51. The inner ring is composed of a plurality of double ball head rollers 52 evenly distributed in a ring shape. As Figure 4 and Figure 5 shown, the hemispherical convex ring of the middle shaft 43 just fits with the waists of the plurality of double ball head rollers 52, and a support ring 53 is provided inside the inner ring. The outer peripheral surface of the support ring 53 abuts against the double ball head rollers 52, and the inner peripheral surface of the support ring 53 abuts against the inner wall of the outer race 51. When the middle part of the support ring 53 is squeezed, both sides of the support ring 53 will expand outwards, enabling the inner ring to expand outwards. At this time, the middle shaft 43 can be withdrawn from the retractable bearing 5. During normal operation of the middle shaft 43, it only receives forces in the front and back directions and will not receive axial forces of the middle shaft 43. Therefore, during normal operation, the middle shaft 43 can be stably located inside the retractable bearing 5;

[0034] Specifically, slots are opened on both sides of the inner wall of the outer race 51, and retainers 54 for limiting the double ball head rollers 52 are provided on both sides of the inner ring. The two retainers 54 are respectively engaged with the two slots to ensure that the inner ring will not fall off;

[0035] It should be noted that, as Figure 6 shown, in order to ensure that when the support ring 53 is subjected to an external extrusion pressure, the support ring 53 can expand outward, and the support ring 53 can stably support the double-ball head roller 52, the cross-section of the support ring 53 is designed to be arc-shaped to ensure that the inner circumferential surface of the support ring 53 can fit the double-ball head roller 52 to stably support it. The outer surface of the support ring 53 is evenly provided with notches, and the notches are triangular in the expanded state. A plurality of notches are arranged in two rows in a circular arrangement, and the two rows of notches are arranged in a staggered manner to ensure that the support ring 53 has a deformation space for outward expansion. The support ring 53 is made of a metal material with good elastic quality, such as beryllium copper alloy.

[0036] A connecting seat 7 is rotatably connected to the central shaft 43 through a retractable bearing 5, and a mounting seat 6 is fixed to the end of the connecting seat 7 away from the central shaft 43 for connecting to the main slider component in the cold heading machine.

[0037] One end of the first connecting shaft 41 away from the connecting block 42 is coaxially connected and fixed to the flywheel 3, so that the flywheel 3 can drive the first connecting shaft 41 to rotate, and thus drive the central shaft 43 and the second connecting shaft 41 to rotate through the connecting block 42. In order to enable the central shaft 43 to reciprocally change its position on the connecting block 42 during the rotation of the crankshaft 4, a reciprocating drive mechanism 8 for driving the central shaft 43 to translate is provided at the end of the second connecting shaft 41 away from the connecting block 42;

[0038] Furthermore, the reciprocating drive mechanism 8 is composed of a sliding component 81, a transmission component 82, and a drive component 83. The sliding component 81 is composed of a first support plate 811, a carriage 812, and a lever 813. The carriage 812 is slidably connected to the first support plate 811. There are two levers 813, and the two levers 813 are distributed at both ends of the central shaft 43. The two levers 813 are rotatably connected to the carriage 812, and the two ends of the central shaft 43 are chamfered to make it smoother for the central shaft 43 to enter between the two levers 813. The drive component 83 is linked to the carriage 812 through the transmission component 82. By sliding the first push-pull block 821 left and right, the central shaft 43 can be toggled by the lever 813 to switch positions between the connecting block 42 and the connecting seat 7;

[0039] Further, the driving component 83 can drive the carriage 812 to slide left and right through the transmission component 82. The transmission component 82 is composed of a first push-pull block 821, a first connecting rod 822, a first push-pull rod 823, a second connecting rod 824, a connecting rod 825 and a transmission component 82 mounting seat 6. The two ends of the first push-pull rod 823 are respectively rotatably connected to the ends of the first connecting rod 822 and the connecting rod 825, and the ends of the first connecting rod 822 and the connecting rod 825 away from the first push-pull rod 823 are respectively rotatably connected to the ends of the first push-pull block 821 and the transmission component 82 mounting seat 6. The transmission component 82 mounting seat 6 is fixed to the bottom of the carriage 812 by bolts. The driving component 83 is composed of a second support plate 831, a driving gear 832, a driven gear 833, a second push-pull rod 834, a cam 835, a dial block 836, a third connecting rod 837 and a second push-pull block 838. The first push-pull block 821 and the second push-pull block 838 are both slidably connected to the second support plate 831, and their sliding directions are perpendicular to each other;

[0040] The side surface of the first push-pull rod 823 is rotatably connected to the second support plate 831. The driving gear 832 is sleeved and fixed on the end of the second connecting shaft 41 away from the connecting block 42. There are two driven gears 833, a second push-pull rod 834 and a cam 835. The two driven gears 833 are distributed on both sides of the driving gear 832, and the two driven gears 833 are both meshed with the driving gear 832. The pitch of the two driven gears 833 and the driving gear 832 is the same, and the number of teeth of the driven gear 833 is twice that of the driving gear 832, ensuring that the driving gear 832 rotates two circles to drive the driven gear 833 to rotate one circle;

[0041] Two cams 835 are distributed at both ends of the shifting block 836. The axes of the two driven gears 833 and the two cams 835 are all rotatably connected to the second support plate 831. The two ends of the two second push rods 834 are respectively rotatably connected to the two driven gears 833 and the two cams 835. The two ends of the third connecting rod 837 are respectively rotatably connected to the shifting block 836 and the second push block 838. Moreover, the side surface of the shifting block 836 away from the third connecting rod 837 is rotatably connected to the second support plate 831. One end of the second push block 838 away from the third connecting rod 837 is slidably connected to the first push block 821. When the crankshaft 4 rotates, it will drive the driving gear 832 to rotate synchronously, making the driving gear 832 drive the driven gear 833 to perform eccentric circular motion through the driven gear 833, thereby driving the cam 835 to rotate synchronously, causing the two cams 835 to repeatedly push the shifting block 836, making the shifting block 836 swing with the connection point with the second support plate 831 as the center, and then pushing the second push block 838 through the third connecting rod 837. Since the connection between the second push block 838 and the first push block 821 is wedge-shaped, and the inner cavity shape of the first push block 821 fits the shape of the connection with the second push block 838, when the second push block 838 displaces along the swinging direction of the shifting block 836, it will drive the first push block 821 to move axially along the central axis 43, thereby pushing and pulling the first push rod 823 through the first connecting rod 822 to swing with the connection point of the first push rod 823 and the second support plate 831 as the center, enabling the first push rod 823 to cooperate with the second connecting rod 824 and the connecting rod 825 to push and pull the carriage 812 to move axially along the central axis 43.

[0042] It should be noted that both the first push block 821 and the second push block 838 are slidably connected to the first push block 821 through the cooperation of a slide rail and a slider. The carriage 812 is also slidably connected to the first support plate 811 through the cooperation of a slide rail and a slider. The connection points of the two second push rods 834 with the two driven gears 833 and the two cams 835 are all eccentrically connected to the two driven gears 833 and the two cams 835, and the eccentric radii of the connection between the second push rod 834 and the driven gear 833 and the cam 835 are the same.

[0043] Working principle: First, the main transmission mechanism of this cold heading forming machine needs to be installed on the cold heading machine body for use. The two connecting shafts 41 are rotatably connected to the cold heading machine body through the cooperation of bearings and bearing seats. The first support plate 811 and the second support plate 831 are fixedly connected to the cold heading machine body through bolts. The belt pulley 1 is fixedly connected to the output end of the cold heading machine motor through a coupling. The main slider component of the cold heading machine is installed on the mounting seat 6. The cold heading machine motor rotates through the belt pulley 1. The belt pulley 1 drives the flywheel 3 to rotate through the synchronous belt 2. The flywheel 3 drives the mounting seat 6 to move back and forth through the crankshaft 4, thereby driving the main slider component of the cold heading machine to slide back and forth for cold heading.

[0044] As shown in the pulley 1 of the specification drawings, at this time, the mounting seat 6 is in the retracted state. The flywheel 3 drives the crankshaft 4 to rotate counterclockwise by 180 degrees, and the mounting seat 6 is in the extended state. When the driving gear 832 rotates by 180 degrees, the driven gears 833 on the left and right sides of the driving gear 832 rotate by 90 degrees respectively. Therefore, when the crankshaft 4 moves from the retracted state to the extended state and then back to the retracted state, the driven gears 833 on the left and right sides of the driving gear 832 rotate by 180 degrees respectively. The two cams 835 linked by the two second push rods 834 on the left and right sides of the driving gear 832 will also rotate by 180 degrees respectively. Since the protruding points of the two cams 835 are in the same direction, every time the two cams 835 rotate by 180 degrees, the protruding point of one of the cams 835 will push the third connecting rod 837 once, so that the third connecting rod 837 can push or pull the second push-pull block 838 once when the crankshaft 4 rotates one week, causing the second push-pull block 838 to move the first push-pull block 821 to slide left or right once. The first push-pull block 821 pulls the first push rod 823 to move left and right through the first connecting rod 822, and the first push rod 823 pulls the carriage 812 to slide left and right through the cooperation of the second connecting rod 824 and the connecting rod 825, so that every time the crankshaft 4 rotates one week, the carriage 812 can move the middle shaft 43 to translate left and right and switch positions within the retractable bearing 5 through the lever 813.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. The main drive mechanism of a cold heading forming machine, comprising a belt pulley (1), a synchronous belt (2), a flywheel (3) and a crankshaft (4), wherein both ends of the synchronous belt (2) are respectively sleeved on the belt pulley (1) and the flywheel (3), and the crankshaft (4) is mounted on the flywheel (3), characterized in that, The crankshaft (4) is composed of a connecting shaft (41), a connecting block (42) and a middle shaft (43). There are two connecting shafts (41) and two connecting blocks (42). The end parts of the two connecting shafts (41) are respectively fixedly connected to one end of the two connecting blocks (42), and the middle shaft (43) passes through the two connecting blocks (42) in sequence. Hemispherical convex rings are uniformly fixed on the outer surface of the middle shaft (43), and a retractable bearing (5) is sleeved on the hemispherical convex ring of the middle shaft (43). The middle shaft (43) is rotationally connected to the connecting block (42) through the retractable bearing (5). The retractable bearing (5) includes an outer shaft ring (51). An inner ring is movably connected inside the outer shaft ring (51). The inner ring is composed of a plurality of double ball-headed rollers (52) evenly distributed in a ring. A support ring (53) is arranged inside the inner ring. The outer peripheral surface of the support ring (53) abuts against the double ball-headed rollers (52), and the inner peripheral surface of the support ring (53) abuts against the inner wall of the outer shaft ring (51). Retaining frames (54) for limiting the double ball-headed rollers (52) are arranged on both sides of the inner ring; One end of the first connecting shaft (41) far from the connecting block (42) is coaxially and fixedly connected to the flywheel (3), and a reciprocating driving mechanism (8) for driving the middle shaft (43) to translate is arranged at one end of the second connecting shaft (41) far from the connecting block (42); The reciprocating driving mechanism (8) is composed of a sliding component (81), a transmission component (82) and a driving component (83). The sliding component (81) is composed of a first support plate (811), a sliding frame (812) and a dial rod (813). The sliding frame (812) is slidably connected to the first support plate (811). There are two dial rods (813). The two dial rods (813) are distributed at both ends of the middle shaft (43), and the two dial rods (813) are both rotationally connected to the sliding frame (812). The driving component (83) is linked with the sliding frame (812) through the transmission component (82); The cross section of the support ring (53) is arc-shaped, and notches are evenly opened on the outer surface of the support ring (53). The notches are triangular. A plurality of notches are arranged in two rows in a ring, and the two rows of notches are arranged staggeredly; Slots are opened on both sides of the inner wall of the outer shaft ring (51), and the two retaining frames (54) are respectively engaged with the two slots.

2. The main drive mechanism of the cold heading forming machine according to claim 1, wherein, A connecting seat (7) is rotationally connected to the middle shaft (43) through the retractable bearing (5), and a mounting seat (6) is fixed at one end of the connecting seat (7) far from the middle shaft (43).

3. The main transmission mechanism of the cold heading forming machine according to claim 1, characterized in that, The transmission assembly (82) is composed of a first push-pull block (821), a first connecting rod (822), a first push-pull rod (823), a connecting rod (825) and a transmission assembly mounting seat. The two ends of the first push-pull rod (823) are respectively rotatably connected to the ends of the first connecting rod (822) and the connecting rod (825). And the ends of the first connecting rod (822) and the connecting rod (825) away from the first push-pull rod (823) are respectively rotatably connected to the ends of the first push-pull block (821) and the transmission assembly mounting seat. And the transmission assembly mounting seat is fixed to the bottom of the carriage (812) by bolts.

4. The main drive mechanism of the cold heading forming machine according to claim 3, characterized in that, The drive assembly (83) is composed of a second support plate (831), a driving gear (832), a driven gear (833), a second push-pull rod (834), a cam (835), a dial block (836), a third connecting rod (837) and a second push-pull block (838). Both the first push-pull block (821) and the second push-pull block (838) are slidably connected to the second support plate (831). The side surface of the first push-pull rod (823) is rotatably connected to the second support plate (831). The driving gear (832) is sleeved and fixed on one end of the second connecting shaft (41) away from the connecting block (42). There are two driven gears (833), two second push-pull rods (834) and two cams (835). The two driven gears (833) are distributed on both sides of the driving gear (832), and the two driven gears (833) are both meshed with the driving gear (832). The two cams (835) are distributed at both ends of the dial block (836). The axes of the two driven gears (833) and the two cams (835) are both rotatably connected to the second support plate (831). The two ends of the two second push-pull rods (834) are respectively rotatably connected to the two driven gears (833) and the two cams (835). The two ends of the third connecting rod (837) are respectively rotatably connected to the dial block (836) and the second push-pull block (838). And the side surface of the dial block (836) away from the third connecting rod (837) is rotatably connected to the second support plate (831). The end of the second push-pull block (838) away from the third connecting rod (837) is slidably connected to the first push-pull block (821). The connection between the second push-pull block (838) and the first push-pull block (821) is wedge-shaped, and the inner cavity shape of the first push-pull block (821) fits the connection shape of the second push-pull block (838).

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