Automatic replacement mechanism for rotary fixed-point installation of a conductive nozzle

Abstract

The present application relates to the technical field of electrically conductive nozzle replacement, and particularly relates to an automatic replacement mechanism for rotary fixed-point installation of electrically conductive nozzles, comprising a rotating disc assembly, an electrically conductive nozzle installation assembly and the like; the rotating disc assembly is provided with the electrically conductive nozzle installation assemblies at intervals in the circumferential direction, and is used for stably placing the electrically conductive nozzles; the electrically conductive nozzle installation assemblies are relatively rotatably installed with the rotating disc assembly through self-lubricating bearings; and an installation driving assembly provides power for the electrically conductive nozzle installation assemblies. Through circumferential arrangement of multiple electrically conductive nozzle installation assemblies on the rotating disc assembly, and cooperation with a rotary driving assembly, the cyclic replenishment of the electrically conductive nozzles is realized; the precise cooperation of a cylinder driving slide plate and a cam follower can automatically drive the rotating disc to rotate to a set angle, and the station switching of new electrically conductive nozzles can be completed without manual intervention.

Description

Technical Field

[0001] This invention relates to the field of conductive nozzle replacement technology, and more particularly to an automatic replacement mechanism for rotary fixed-point conductive nozzles. Background Technology

[0002] In the field of automated welding production, the contact tip, as a core consumable component of the welding torch, needs frequent replacement to ensure welding accuracy and stability. Traditional contact tip replacement largely relies on manual operation, requiring workers to manually disassemble the old contact tip and position the new one. This is not only time-consuming and labor-intensive, but also prone to problems such as insufficient torque or overload due to uneven manual tightening force, leading to loosening or burning of the contact tip during welding, severely affecting the consistency of welding quality. Furthermore, manual replacement requires interrupting the welding production line, significantly reducing production efficiency and making it difficult to meet the high-efficiency requirements of large-scale automated welding operations.

[0003] To address the drawbacks of manual replacement, some automated replacement devices have emerged. However, existing devices suffer from drawbacks such as complex structure and poor operational stability. In most devices, the turntable and the contact tip mounting components lack sufficient precision, resulting in significant rotational positioning errors and misalignment between the contact tip and the welding torch. Furthermore, the lack of a reliable torque control mechanism makes it easy to damage the contact tip threads or the welding torch interface during assembly. In addition, the existing devices have poor reset performance of the contact tip mounting components, resulting in uneven feeding and discharging transmissions and a tendency to jam, making continuous and stable automated replacement impossible. Therefore, an automated replacement mechanism with a rotary, fixed-point contact tip mounting system is needed to solve these technical problems. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide an automatic replacement mechanism for a rotary fixed-point installation conductive nozzle.

[0005] The technical solution is as follows: an automatic replacement mechanism for rotary fixed-point installation of conductive nozzles, including a turntable assembly, a conductive nozzle mounting assembly, an installation drive assembly, and a rotation drive assembly; wherein, the turntable assembly is provided with conductive nozzle mounting assemblies at circumferential intervals for stable placement of the conductive nozzles, and the conductive nozzle mounting assemblies are installed relative to the turntable assembly through self-lubricating bearings; the installation drive assembly provides power to the conductive nozzle mounting assemblies to realize the automatic screwing and assembly of the conductive nozzles and welding torch; the rotation drive assembly provides rotational power to rotate the turntable assembly to a fixed angle.

[0006] As a further preferred embodiment, the turntable assembly includes an upper rotating disk, a lower rotating disk, and an upper pressure plate, which are fixedly connected by fasteners to form the main structure of the turntable assembly. A lower pressure plate is fixed on a rotary support and is rotatably connected to the lower rotating disk via a first deep groove ball bearing. Several cam followers are evenly distributed on the outer circular surface of the lower rotating disk, and the cam followers are rotatably connected to the outer circular surface of the lower rotating disk. Several through holes are evenly distributed around the circumference of the upper and lower rotating disks away from the central axis. Self-lubricating bearings are installed in the holes of both the upper and lower rotating disks, and conductive nozzle mounting assemblies are installed between the corresponding upper and lower self-lubricating bearings.

[0007] As a further preferred embodiment, the rotary drive assembly includes a cylinder, which is fixedly connected to a mounting plate. The mounting plate is fixed to the automatic contact nozzle changing device by a third screw. A slide plate is provided on the top of the cylinder. A vertical slide is opened in the upper center of the slide plate. An inclined discharge slide is opened on the left side of the slide plate. A feed slide is opened on the right side of the slide plate. The feed slide, discharge slide and vertical slide are connected. Inclined surfaces are symmetrically opened on both sides of the top of the slide plate. The slide plate cooperates with a cam follower.

[0008] As a further preferred embodiment, the conductive nozzle mounting assembly includes an inner cylinder. The inner cylinder is mounted on the self-lubricating bearing of the upper rotating disk. A hollow section is formed in the upper part of the inner cylinder, and the conductive nozzle seat is placed in the hollow section and fixedly assembled with the inner cylinder by a first screw. A through groove is formed in the lower part of the inner cylinder, and a hollow section is formed at the bottom of the inner cylinder. A coupling sleeve is inserted into the hollow section at the bottom of the inner cylinder. A second screw passes through the through groove of the inner cylinder and connects with the coupling sleeve. The through groove is an axially elongated groove structure, allowing the coupling sleeve to move axially along the through groove. A return spring is provided between the lower part of the inner cylinder and the lower rotating disk to realize the axial return of the inner cylinder.

[0009] As a further preferred embodiment, the drive assembly includes a fixed pressure plate, within which a second deep groove ball bearing is installed. The inner wall of the second deep groove ball bearing is provided with an interference fit to the lower part of the cylindrical gear. The cylindrical gear has a stepped hollow section that is wider at the bottom and narrower at the top. The coupling head, with its narrow end facing upwards, is inserted into the hollow section from the wider end of the lower part of the cylindrical gear. A vertical slot is symmetrically cut in the lower part of the cylindrical gear about its central axis. A cylindrical pin is installed laterally between the two slots in the cylindrical gear. Two mutually perpendicular semicircular grooves are cut at the bottom of the coupling head. One of the arc-shaped grooves contacts the cylindrical pin to achieve circumferential limiting. A spring washer is slidably installed in the hollow part at the bottom of the cylindrical gear, and the spring washer abuts against the bottom of the cylindrical pin. The bottom of the cylindrical gear is fixed to the cylindrical cylinder, and a spring washer is also slidably installed in the inner cavity of the cylindrical cylinder. A compression spring is installed between the two spring washers. A threaded hole is opened in the center of the bottom of the cylindrical cylinder. A lock nut is screwed on the fourth screw. The fourth screw is screwed into the threaded hole at the bottom of the cylindrical cylinder. By turning the fourth screw, the spring washer of the cylindrical cylinder is squeezed, thereby adjusting the compression amount of the compression spring and thus controlling the torque.

[0010] As a further preferred option, a through groove is milled on the upper surface of the conductive nozzle seat, and the direction of the groove is consistent with the direction of the flat ring of the conductive nozzle.

[0011] As a further preferred option, it also includes a mounting plate, on which the upper rotating plate is rotatably mounted. A mounting cover is hinged to the mounting plate, and the two are locked together by a snap-fit. A replacement hole is provided on the mounting cover at the position directly above the coupling head.

[0012] As a further preferred option, the inner walls of both the feed and discharge channels of the slide plate are equipped with removable wear-resistant liners. The wear-resistant liners are fixed to the slide plate by countersunk screws, and the surface of the wear-resistant liners is coated with a solid lubricating coating.

[0013] The beneficial effects are:

[0014] 1. Multiple conductive tip mounting components are arranged circumferentially on a turntable assembly. This, combined with a rotary drive assembly, enables the cyclical replenishment of conductive tips. A cylinder-driven slide plate and a cam follower precisely coordinate, automatically rotating the turntable to a set angle, allowing for seamless switching of the new conductive tip without manual intervention. The mounting drive assembly, through gear transmission and torque control, automatically screws the conductive tip and welding torch together, replacing traditional manual screwing methods. This avoids issues of excessively loose or tight assembly caused by manual operation, significantly improving the continuity and stability of the changeover process.

[0015] 2. The conductive tip mounting assembly, through a self-lubricating bearing, cooperates with the turntable assembly and, with a return spring, achieves precise axial reset. The conductive tip seat slot and the conductive tip flat ring are precisely aligned to ensure assembly positioning accuracy. The compression spring and cylindrical pin of the mounting drive assembly cooperate with the semi-circular groove of the coupling head to preset and stably control the assembly torque. In case of overload, relative rotation provides idling protection, preventing damage to the conductive tip or welding torch threads. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a three-dimensional structural diagram of the turntable assembly of the present invention.

[0018] Figure 3 This is a partial exploded view of the turntable assembly of the present invention.

[0019] Figure 4 This is a partial exploded structural diagram of the conductive nozzle mounting assembly of the present invention.

[0020] Figure 5 This is a three-dimensional structural diagram of the rotary drive component of the present invention.

[0021] Figure 6 This is a three-dimensional structural diagram of the drive assembly for the present invention.

[0022] Figure 7 This is a partially exploded structural diagram of the drive assembly of the present invention.

[0023] Figure 8 This is a three-dimensional structural diagram of the coupling head of the present invention.

[0024] Figure 9 This is a schematic diagram of the installation structure of the present invention.

[0025] Figure 10 This is a schematic diagram of the mounting structure of the coupling head mounting plate of the present invention.

[0026] Labels in the diagram: 1-Turntable assembly, 10-Upper rotary disc, 11-Upper pressure plate, 12-Conductive nozzle mounting assembly, 120-Conductive nozzle seat, 121-Inner cylinder, 122-First screw, 123-Return spring, 124-Second screw, 125-Coupling sleeve, 13-Lower rotary disc, 14-Rotation support, 15-Lower pressure plate, 16-Conductive nozzle, 17-Self-lubricating bearing, 18-Cam follower, 19-First deep groove ball bearing, 2-Rotation... 20-Slide plate, 21-Third screw, 22-Mounting plate, 23-Cylinder, 3-Mounting drive assembly, 30-Fixing pressure plate, 31-Cylindrical gear, 32-Cylindrical cylinder, 33-Anti-loosening nut, 34-Fourth screw, 35-Coupling head, 36-Second deep groove ball bearing, 37-Compression spring, 38-Spring washer, 39-Cylindrical pin, 4-Automatic contact tip replacement device, 5-Mounting plate, 6-Mounting cover, 7-Replacement hole. Detailed Implementation

[0027] The technical solution will be further described below with reference to specific embodiments. It should be noted that the terms "up," "down," "left," and "right" used in this document refer only to the position of the structure shown in the corresponding drawings. The serial numbers assigned to components in this document, such as "first," "second," etc., are only used to distinguish the described objects and have no sequential or technical meaning. Unless otherwise specified, terms such as "connection" and "linkage" in this application include both direct and indirect connections (linkages).

[0028] Example: Automatic replacement mechanism for rotary fixed-point installation of conductive nozzles, such as... Figure 1As shown, the assembly includes a turntable assembly 1, a conductive nozzle mounting assembly 12, a mounting drive assembly 3, and a rotation drive assembly 2. The turntable assembly 1 is circumferentially spaced with conductive nozzle mounting assemblies 12 for stably placing conductive nozzles 16. The conductive nozzle mounting assemblies 12 are mounted relative to the turntable assembly 1 via self-lubricating bearings 17. The mounting drive assembly 3 provides power to the conductive nozzle mounting assemblies 12 to achieve automatic screwing and assembly of the conductive nozzles 16 and the welding torch. The rotation drive assembly 2 provides rotational power to rotate the turntable assembly 1 to a fixed angle.

[0029] like Figure 1 , Figure 2 and Figure 3 As shown, the turntable assembly 1 includes an upper rotating disk 10, and the upper rotating disk 10, lower rotating disk 13 and upper pressure disk 11 are fixedly connected by fasteners to form the main structure of the turntable assembly 1. A lower pressure disk 15 is fixed on the rotary support 14. The lower pressure disk 15 is rotatably connected to the lower rotating disk 13 through a first deep groove ball bearing 19. Several cam followers 18 are evenly distributed on the outer circular surface of the lower rotating disk 13. Several through holes are evenly distributed on the circumference of the upper rotating disk 10 and the lower rotating disk 13 away from the central axis. Self-lubricating bearings 17 are provided in the holes of the upper rotating disk 10 and the lower rotating disk 13. A conductive nozzle mounting assembly 12 is installed between the upper and lower corresponding self-lubricating bearings 17.

[0030] like Figure 1 and Figure 5 As shown, the rotary drive assembly 2 includes a cylinder 23, which is fixedly connected to the mounting plate 22. The mounting plate 22 is fixed to the conductive nozzle automatic replacement device 4 by a third screw 21. A slide plate 20 is provided on the top of the cylinder 23. A vertical slide is opened in the upper center of the slide plate 20. An inclined discharge slide is opened on the left side of the slide plate 20, and a feed slide is opened on the right side of the slide plate 20. The feed slide, discharge slide and vertical slide are connected. Inclined surfaces are symmetrically opened on both sides of the top of the slide plate 20. The slide plate 20 cooperates with the cam follower 18. The inner walls of the feed slide and discharge slide of the slide plate 20 are provided with removable wear-resistant liners. The wear-resistant liners are fixed to the slide plate 20 by countersunk screws. The surface of the wear-resistant liners is coated with a solid lubricating coating.

[0031] like Figure 1 and Figure 4As shown, the conductive nozzle mounting assembly 12 includes an inner cylinder 121. The inner cylinder 121 is mounted on the self-lubricating bearing 17 of the upper rotating disk 10. A hollow portion is formed in the upper part of the inner cylinder 121. The conductive nozzle seat 120 is placed in the hollow portion and fixedly assembled with the inner cylinder 121 by a first screw 122. A through groove is formed in the lower part of the inner cylinder 121. A hollow portion is formed at the bottom of the inner cylinder 121. A coupling sleeve 125 is inserted into the hollow portion at the bottom of the inner cylinder 121. A second screw 124 passes through the through groove of the inner cylinder 121 and connects with the coupling sleeve 125. The through groove is an axially elongated groove structure, allowing the coupling sleeve 125 to move axially along the through groove. A return spring 123 is provided between the lower part of the inner cylinder 121 and the lower rotating disk 13 to realize the axial return of the inner cylinder 121. A through groove is milled on the upper surface of the conductive nozzle seat 120. The direction of the groove is consistent with the direction of the flat ring of the conductive nozzle.

[0032] like Figure 1 , Figure 6 , Figure 7 and Figure 8 As shown, the drive assembly 3 includes a fixed pressure plate 30, within which a second deep groove ball bearing 36 is installed. The inner wall of the second deep groove ball bearing 36 is provided with an interference fit to the lower part of the cylindrical gear 31. The cylindrical gear 31 has a stepped hollow section that is wider at the bottom and narrower at the top. The coupling head 35, with its narrow end facing upwards, is inserted into the hollow section from the wide end of the lower part of the cylindrical gear 31. A vertical slot is symmetrically opened in the lower part of the cylindrical gear 31 about the central axis. A cylindrical pin 39 is installed laterally between the two slots in the cylindrical gear 31. The bottom of the coupling head 35 has two mutually perpendicular semicircular grooves, one of which is an arc-shaped groove that connects to the cylindrical pin. 39 contacts achieve circumferential limiting. A spring washer 38 is slidably disposed in the hollow part of the lower part of the cylindrical gear 31, and the spring washer 38 abuts against the bottom of the cylindrical pin 39. The bottom of the cylindrical gear 31 is fixedly connected to the cylindrical cylinder 32, and a spring washer 38 is also slidably disposed in the inner cavity of the cylindrical cylinder 32. A compression spring 37 is disposed between the two spring washers 38. A threaded hole is opened at the center of the bottom of the cylindrical cylinder 32. A lock nut 33 is screwed on the fourth screw 34. The fourth screw 34 is screwed into the threaded hole at the bottom of the cylindrical cylinder 32. By turning the fourth screw 34, the spring washer 38 of the cylindrical cylinder 32 is squeezed, thereby adjusting the compression amount of the compression spring 37, thereby controlling the torque.

[0033] like Figure 9 and Figure 10 As shown, it also includes a mounting plate 5, with an upper rotating plate 10 rotatably mounted on the mounting plate 5. A mounting cover 6 is hinged to the mounting plate 5, and the two are locked together by a snap fastener. A replacement hole 7 is provided on the mounting cover 6 at the position directly above the connecting shaft head 35.

[0034] This mechanism is installed on the automatic contact tip replacement device 4. When the contact tip 16 needs to be installed, first remove the contact tip 16 from the welding torch. Then, align the installation port of the contact tip of the welding torch with the replacement hole 7 of the installation cover 6. After the installation port of the welding torch is threadedly connected to the upper part of the contact tip 16 in the contact tip holder 120, apply a downward force. At the same time, the operator needs to activate the motor button set in the automatic contact tip replacement device 4. The motor works, and the gear on the motor output shaft meshes with the cylindrical gear 31. The cylindrical gear 31 rotates. When the coupling head 35 rotates to the position where the slot is aligned with the coupling sleeve 125, the welding torch is forced to squeeze the contact tip 16, causing the contact tip installation assembly 12 to move down synchronously. When the slot of the coupling head 35 rotates to the position corresponding to the coupling sleeve 125, the coupling sleeve 125 is engaged in the slot of the coupling head 35. The cylindrical gear 31 then drives the coupling sleeve 125 to rotate via the coupling head 35. The coupling sleeve 125 drives the inner cylinder 121 and the conductive nozzle seat 120 to rotate synchronously. The conductive nozzle seat 120 drives the conductive nozzle 16 to rotate, thus enabling the conductive nozzle 16 and the welding torch to be screwed together. Under the pressure of the compression spring 37 and the spring washer 38, the cylindrical pin 39 is always embedded in the semi-circular groove at the bottom of the coupling head 35, maintaining the set torque. When the conductive nozzle 16 and the welding torch are tightened, the torque becomes too large. At this time, the semi-circular groove at the bottom of the coupling head 35 and the cylindrical pin 39 will rotate relative to each other, and the cylindrical gear 31 and the cylindrical pin 39 will spin freely. The coupling head 35 will no longer drive the coupling sleeve 125 to rotate, thus playing a torque protection role. The operator turns off the motor and removes the welding torch.

[0035] The rotary table assembly 1 needs to be rotated to drive the new conductive nozzle mounting assembly 12 and conductive nozzle 16 to rotate below the replacement hole 7 of the mounting cover 6, preparing for the next replacement. After the air source is connected, the cylinder 23 moves up and down, which can drive the slide plate 20 to move up and down. When the slide plate 20 moves upward, the vertical slide of the slide plate 20 faces a certain cam follower 18 in the rotary table assembly 1. After the bottom of the vertical slide of the slide plate 20 contacts the cam follower 18, the inclined surface of the discharge slide of the slide plate 20 squeezes the cam follower 18, and then the cam follower 18 drives the lower rotary table 13 to rotate at a preset angle. At the same time, the adjacent cam follower 18 rotates to the slide plate 13. At the inlet end of the feed slide on the right side of the slide plate 20, when the cylinder 23 drives the slide plate 20 to move downward, the cam follower 18 moves along the feed slide and finally reaches the vertical slide position. When the cylinder 23 drives the slide plate 20 to continue to move downward and reset, the angle of the rotation of the lower rotating disk 13 driven by the cam follower 18 is exactly below the replacement hole 7 of the new conductive nozzle 16, thus realizing the automatic replenishment of the conductive nozzle 16. After all the conductive nozzles 16 have been used, open the installation cover 6, align the flat ring of the new conductive nozzle 16 with the through groove on the upper surface of the conductive nozzle seat 120, and the positioning and assembly of the conductive nozzle 16 can be quickly completed.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic replacement mechanism for a rotary fixed-point installation conductive nozzle, characterized in that, include: Turntable assembly (1), conductive nozzle mounting assembly (12), mounting drive assembly (3) and rotation drive assembly (2); The turntable assembly (1) is provided with conductive nozzle mounting assemblies (12) spaced circumferentially to stably place the conductive nozzles (16), and the conductive nozzle mounting assemblies (12) are installed relative to the turntable assembly (1) via self-lubricating bearings (17); the mounting drive assembly (3) provides power to the conductive nozzle mounting assemblies (12) to realize the automatic screwing assembly of the conductive nozzles (16) and the welding torch; the rotation drive assembly (2) provides rotational power to rotate the turntable assembly (1) to a fixed angle. The turntable assembly (1) includes an upper rotating disk (10) and a lower rotating disk (13), and the conductive nozzle mounting assembly (12) includes an inner cylinder (121). The self-lubricating bearing (17) of 0) is provided with an inner cylinder (121). The upper part of the inner cylinder (121) has a hollow part. The conductive nozzle seat (120) is placed in the hollow part and fixedly assembled with the inner cylinder (121) by the first screw (122). The lower part of the inner cylinder (121) has a through groove. The bottom of the inner cylinder (121) has a hollow part. The coupling sleeve (125) is inserted into the hollow part at the bottom of the inner cylinder (121). The second screw (124) passes through the through groove of the inner cylinder (121) and connects with the coupling sleeve (125). The through groove is an axially long groove structure, so that the coupling sleeve (125) can move axially along the through groove. The lower part of the inner cylinder (121) is connected to the lower rotating disk. A return spring (123) is provided between (13) to realize the axial return of the inner cylinder (121). The installation drive assembly (3) includes: a fixed pressure plate (30), in which a second deep groove ball bearing (36) is provided. The inner side wall of the second deep groove ball bearing (36) is provided with an interference fit with the lower part of the cylindrical gear (31). The cylindrical gear (31) has a stepped hollow part that is wider at the bottom and narrower at the top. The connecting head (35) is placed into the hollow part from the wide end of the lower part of the cylindrical gear (31) with its narrow end facing upward. The lower part of the cylindrical gear (31) has a vertical slot symmetrically opened about the central axis. The two slots in the cylindrical gear (31) A cylindrical pin (39) is installed horizontally between the two parts. The bottom of the coupling head (35) has two mutually perpendicular semi-circular grooves, one of which is an arc-shaped groove that contacts the cylindrical pin (39) to achieve circumferential positioning. A spring washer (38) is slidably arranged in the hollow part of the lower part of the cylindrical gear (31), and the spring washer (38) abuts against the bottom of the cylindrical pin (39). The bottom of the cylindrical gear (31) is fixedly connected to the cylindrical cylinder (32), and a spring washer (38) is also slidably arranged in the inner cavity of the cylindrical cylinder (32). A compression spring (37) is arranged between the two spring washers (38). A threaded hole is opened in the center of the bottom of the cylindrical cylinder (32), and a lock nut (33) is screwed on the fourth screw (34).The fourth screw (34) is screwed with the bottom threaded hole of the cylindrical barrel (32), the fourth screw (34) is screwed to extrude the spring washer (38) of the cylindrical barrel (32), and then the compression amount of the compression spring (37) is adjusted, so that the torque size is controlled.

2. The automatic replacement mechanism for a contact tip of an arc welding torch according to claim 1, wherein The turntable assembly (1) further includes: an upper pressure plate (11), the upper rotating disk (10), the lower rotating disk (13) and the upper pressure plate (11) are fixedly connected by fasteners to form the main structure of the turntable assembly (1); a lower pressure plate (15) is fixed on the rotary support (14), the lower pressure plate (15) is rotatably connected to the lower rotating disk (13) through a first deep groove ball bearing (19), a number of cam followers (18) are evenly distributed on the outer circular surface of the lower rotating disk (13), a number of through holes are evenly distributed on the circumference of the upper rotating disk (10) and the lower rotating disk (13) away from the central axis, and a self-lubricating bearing (17) is provided in the holes of the upper rotating disk (10) and the lower rotating disk (13), and a conductive nozzle mounting assembly (12) is installed between the upper and lower corresponding self-lubricating bearings (17).

3. The automatic replacement mechanism for a contact tip of an arc welding torch according to claim 2, wherein The rotary drive assembly (2) includes: The cylinder (23) is fixedly connected to the mounting plate (22), which is fixed to the conductive nozzle automatic replacement device (4) by the third screw (21). The top of the cylinder (23) is provided with a slide plate (20), and a vertical slide is opened in the upper center of the slide plate (20). An inclined discharge slide is opened on the left side of the slide plate (20), and a feed slide is opened on the right side of the slide plate (20). The feed slide, discharge slide and vertical slide are connected. The top two sides of the slide plate (20) are symmetrically opened with inclined surfaces. The slide plate (20) cooperates with the cam follower (18).

4. The automatic replacement mechanism for a contact tip of an arc welding torch according to claim 3, wherein: The upper surface of the conductive nozzle seat (120) is milled with a through groove, the direction of which is consistent with the direction of the flat ring of the conductive nozzle.

5. The automatic replacement mechanism for a contact tip of an arc welding torch according to claim 4, wherein: It also includes a mounting plate (5), the upper rotating plate (10) is rotatably mounted on the mounting plate (5), and a mounting cover (6) is hinged on the mounting plate (5), and the two are locked together by a snap fastener; the mounting cover (6) is provided with a replacement hole (7) at the position directly above the connecting shaft head (35).

6. The automatic replacement mechanism for a contact tip of an arc welding torch according to claim 5, wherein: The inner walls of the feed slide and discharge slide of the slide plate (20) are provided with detachable wear-resistant liners. The wear-resistant liners are fixed to the slide plate (20) by countersunk screws, and the surface of the wear-resistant liners is coated with a solid lubricating coating.

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