A positioning fixture for arc welding equipment

Abstract

This application relates to the field of welding torch equipment fixing technology, specifically disclosing a positioning fixture for arc welding equipment, including a base, a guide structure disposed on the base, a positioning structure disposed on the guide structure, and a clamping assembly slidably connected to the guide structure. The guide structure and the clamping assembly form an axial movement, and the positioning structure is used for matching and positioning with the welding torch cone shank. The purpose of this patent is to solve the problem that existing welding torch fixing devices cannot simultaneously achieve welding torch replacement efficiency and positioning accuracy.

Description

Technical Field

[0001] This utility model relates to the field of welding torch equipment fixing technology, and in particular to a positioning fixture for arc welding equipment. Background Technology

[0002] The robotic welding torch positioning device is a core component of an automated welding system. It is used to precisely fix the welding torch to the end of the robotic arm, ensuring that the spatial position, angle, and stability of the welding torch meet process requirements during welding. Its positioning accuracy directly affects weld quality and welding efficiency. Traditional solutions often rely on bolt locking or pneumatic clamping structures, but these generally suffer from low replacement efficiency and insufficient repeatability, especially in scenarios involving frequent welding torch changes or maintenance, making it difficult to balance ease of operation with positioning reliability.

[0003] CN220515833U discloses a welding torch holder for a welding robot. This design uses a clamping seat with a bidirectional threaded screw driving the clamping plate, and controls the clamping force via a motor to accommodate welding torches of different sizes. However, since each replacement requires starting the motor to adjust the clamping plate position, it is time-consuming; and the length of the torch neck needs to be manually stretched and adjusted, lacking an automatic positioning mechanism, resulting in low repeatability. Therefore, it suffers from the drawbacks of cumbersome operation and reliance on manual calibration for positioning.

[0004] CN222037323U discloses a quick-change device for welding torches on a welding robot. This solution uses a telescopic cylinder to drive a sliding frame and a round-headed part to lock and fix the mounting bracket, thus achieving quick torch replacement. However, since it only achieves axial fixation, the torch angle needs to be adjusted separately, which can easily lead to welding path deviation.

[0005] Neither solution resolved the contradiction between "quick replacement" and "precise positioning". The former sacrifices accuracy for replacement efficiency, while the latter relies on quick-connect components to achieve quick replacement but ignores circumferential positioning, resulting in the need to calibrate the position after the welding torch is replaced, affecting the continuity of welding. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the technical problem solved by this utility model is to provide a positioning fixture for arc welding equipment, which solves the problem that the existing welding torch fixing device cannot simultaneously achieve the replacement efficiency and positioning accuracy of the welding torch.

[0007] To solve the above problems, the technical solution adopted by this utility model is: a positioning fixture for an arc welding equipment, including a base, a guide structure disposed on the base, a positioning structure disposed on the guide structure, and a clamping assembly slidably connected to the guide structure. The guide structure and the clamping assembly form an axial movement, and the positioning structure is used to match and position with the welding torch cone handle. The base is fixed to the end of the robotic arm; the guide structure is a cylinder with multiple grooves evenly arranged axially on the outer circumferential surface of the cylinder, and a linear guide pair is fixed in the groove; the clamping assembly includes a conical sleeve, the front end of the conical sleeve is an elastic conical section, and the rear end is a connecting section; the positioning structure includes a magnetic positioning unit and a circumferential limiting unit, the magnetic positioning unit has an annular groove machined on the end face of the guide structure, and a permanent magnet is embedded therein; a magnetic ring is fixedly installed at the tail of the welding torch cone handle; the circumferential limiting unit adopts a single key pin structure, with multiple elastically extendable spring pins arranged radially on the guide structure, the ends of the spring pins are provided with balls, and a single key groove matching the balls is machined at the tail of the welding torch cone handle.

[0008] Compared with existing technologies, the beneficial effects of this solution are: 1. This technical solution achieves pre-positioning of the welding torch through magnetic attraction and angle locking through the circumferential limiting unit, without the need for additional tools, thus improving operational efficiency and facilitating rapid replacement of the welding torch; 2. This technical solution achieves pre-positioning through magnetic attraction, then restricts the rotation of the welding torch through the circumferential limiting unit, and finally achieves radial rigid locking through the conical sleeve.

[0009] Furthermore, the linear guide pair consists of a guide rail and a slider. The guide rail is fixed to the guide structure by countersunk screws, and the top surface of the slider has a pre-drilled threaded hole.

[0010] Furthermore, a connecting plate is provided on the inner side of the rear end of the tapered sleeve, and a through hole is provided on the tapered sleeve and the connecting plate. The tapered sleeve and the guide rail slider are fixed by bolts passing through the through hole and the threaded hole on the top surface of the slider.

[0011] Furthermore, a locking ring is coaxially arranged on the outer side of the clamping assembly. The locking ring is in the shape of a hollow cylinder. The inner diameter of the locking ring is equal to the outer diameter of the tapered sleeve connecting section. The surface of the tapered sleeve connecting section is machined with protruding threads. The inner wall of the locking ring is machined with recessed internal threads. A spiral nylon ring formed by nylon strips is embedded in the internal threads. The diameter of the spiral nylon ring is smaller than the outer diameter of the tapered sleeve connecting section.

[0012] Furthermore, the outer circumferential surface of the locking ring is machined with axial grooves that are evenly spaced. Attached Figure Description

[0013] Figure 1 This is an exploded view of the structure of the present invention.

[0014] Figure 2 This is a schematic diagram of the base, guide, and positioning structure of the present invention.

[0015] Figure 3 This is a schematic diagram of the clamping component structure of the present invention.

[0016] Figure 4 This is a schematic diagram of the locking ring structure of the present invention.

[0017] Figure 5 This is a schematic diagram of the welding torch structure of the present invention.

[0018] The reference numerals in the accompanying drawings include: 1 base; 2 guide structure; 21 linear guide pair; 211 guide rail; 212 slider; 3 clamping assembly; 31 tapered sleeve; 32 connecting plate; 4 positioning structure; 41 magnetic positioning unit; 411 annular groove; 42 circumferential limiting unit; 421 spring pin; 422 ball; 5 welding torch; 51 tapered shank; 511 magnetic ring; 512 single keyway; 52 connecting rod; 53 nozzle; 54 air inlet pipe; 6 locking ring; 61 axial groove; 62 internal thread. Detailed Implementation

[0019] The following is a further detailed description of this application.

[0020] Example 1 like Figure 1 As shown in the embodiment of this application, the positioning fixture for arc welding equipment includes a base 1 fixed to the end of a robotic arm, a guide structure 2 disposed on the base 1, a positioning structure 4 disposed on the guide structure 2, and a clamping assembly 3 slidably connected to the guide structure 2. The guide structure 2 and the clamping assembly 3 move axially, and the positioning structure 4 is used to match and position with the cone handle 51 of the welding torch 5, thereby achieving the effect of accurately positioning the cleaned welding torch 5 so that it is in the same relative position as the original welding torch 5.

[0021] Specifically, such as Figure 5 As shown, the welding torch 5 includes a cone shank 51, a connecting rod 52, a nozzle 53, and an air inlet pipe 54. The cone shank 51 is detachably connected to the connecting rod 52. The cone shank 51 is the part that contributes to this application, and the rest are prior art and will not be described in detail.

[0022] Specifically, such as Figure 1 , 2 As shown, base 1 is used to fix the entire positioning device to the end of the robotic arm. Base 1 can be made of metal materials, such as aluminum alloy, which is high in strength and light in weight, meeting the requirements for stable installation of the device on the robotic arm. Base 1 is fixed to the end of the robotic arm by flange connection, which has the advantages of easy disassembly and reliable connection; it can also be fixed by welding, which makes the connection between base 1 and robotic arm more secure, but disassembly and replacement are relatively difficult later.

[0023] Specifically, such as Figure 1 , 2As shown, the guide structure 2 is a cylinder with multiple grooves evenly arranged axially on its outer circumferential surface. A linear guide pair 21 is fixed within each groove, and the linear guide pair 21 is secured to the guide structure 2 by countersunk screws. The linear guide pair 21 consists of a guide rail 211 and a slider 212. The guide rail 211 is fixed to the guide structure 2, and the top surface of the slider 212 has a pre-drilled threaded hole for connecting the clamping assembly 3. The slider 212 is connected to the clamping assembly 3, and the movement of the clamping assembly 3 is achieved by sliding the slider 212 on the guide rail 211. The linear guide pair 21 provides precise guidance for the sliding of the clamping assembly 3, ensuring that the clamping assembly 3 can move axially along the linear guide pair 21.

[0024] Specifically, such as Figure 1 , 3 As shown in Figure 4, the clamping assembly 3 includes a tapered sleeve 31. The front end of the tapered sleeve 31 is an elastic tapered section, and the rear end is an elastic connecting section. The outer surface of the rear elastic connecting section is machined with a protruding thread that matches the recessed internal thread 62 of the locking ring 6. A rectangular connecting plate 32 is provided on the inner side of the rear end of the tapered sleeve 31, and through holes are opened on the tapered sleeve 31 and the connecting plate 32. The tapered sleeve 31 and the guide rail slider 212 are initially fixed by bolts passing through the through holes and the threaded holes on the top surface of the slider 212.

[0025] Specifically, such as Figure 2 As shown, the positioning structure 4 includes a magnetic positioning unit 41 and a circumferential limiting unit 42.

[0026] like Figure 2 , 5 As shown, the magnetic positioning unit 41 has an annular groove 411 machined on the end face of the guide structure 2, which contains a permanent magnet, such as a high-performance neodymium iron boron magnet, which has strong magnetism and good stability; ferrite magnets can also be used, which are relatively inexpensive. A magnetic guide ring 511 is fixedly installed at the tail of the cone shank 51. The magnetic guide ring 511 is made of low-carbon steel, which has good magnetic conductivity; pure iron can also be used. First, the cone shank 51 is inserted into the conical sleeve 31. Then, the cone shank 51 and the conical sleeve 31 are placed together on the positioning structure 4. The magnetic guide ring 511 is attracted by the magnetic force generated by the permanent magnet in the annular groove 411, realizing the pre-positioning and coarse locking of the axial position of the cone shank 51, preventing it from accidentally falling off.

[0027] like Figure 1 , 2As shown, the circumferential limiting unit 42 adopts a single-key pin structure. Specifically, multiple elastically retractable spring pins 421 are arranged circumferentially on the guide structure 2, and the ends of the spring pins 421 are provided with ball bearings 422. A matching single keyway 512 is machined at the tail of the tapered shank 51. When the tapered shank 51 and the tapered sleeve 31 are magnetically attracted together, the ends of the ball bearings 422 on the spring pins 421 are compressed and retracted. By rotating the tapered shank 51 until the ball bearings 422 are engaged in the single keyway 512 at the tail of the tapered shank 51, a "click" tactile or audible feedback is emitted, completing the positioning of the circumferential angle of the tapered shank 51.

[0028] Specifically, such as Figure 3 , 4 As shown, a locking ring 6 is coaxially mounted on the outer side of the clamping assembly 3. The locking ring 6 is a hollow cylinder, and its inner diameter is equal to the outer diameter of the connecting section of the tapered sleeve 31, ensuring that it can be coaxially fitted onto the outside of the tapered sleeve 31. The connecting section of the tapered sleeve 31 has protruding threads, and the inner wall of the locking ring 6 has recessed internal threads 62. A nylon strip is embedded in the internal threads 62 to form a rotating nylon ring. The diameter of the rotating nylon ring is smaller than the outer diameter of the connecting section of the tapered sleeve 31. The tapered sleeve 31 and the locking ring 6 are fitted together by the threaded pair. When the locking ring 6 is tightened, the rotating nylon ring is radially deformed by the threads of the connecting section of the tapered sleeve 31, generating lateral pressure and friction, thereby achieving locking. To facilitate the operator to apply rotational torque, the outer circumferential surface of the locking ring 6 has axially spaced grooves 61. The axial grooves 61 increase the friction and facilitate manual tightening or loosening operations.

[0029] The implementation principle of this embodiment is as follows: After the welding torch 5 completes its initial positioning through the magnetic positioning unit 41 and the circumferential limiting unit 42, the tapered sleeve 31 and the guide rail slider 212 are initially fixed by bolts passing through the through hole of the tapered sleeve 31 and the threaded hole on the top surface of the slider 212. Then, the operator tightens the locking ring 6. The internal thread 62 of the locking ring 6 interacts with the external thread of the connecting section of the tapered sleeve 31, causing the nylon strip to be squeezed and deformed, generating lateral pressure and friction, thereby eliminating the fit gap between the connecting section of the tapered sleeve 31 and the tapered shank 51, forming an interference fit, thus achieving the final and secure locking of the welding torch 5 on the tooling.

[0030] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A positioning fixture for an arc welding equipment, comprising a base, a guide structure disposed on the base, a positioning structure disposed on the guide structure, and a clamping assembly slidably connected to the guide structure, wherein the guide structure and the clamping assembly form an axial movement, and the positioning structure is used for matching and positioning with the welding torch cone shank, characterized in that: The base is fixed to the end of the robotic arm; the guide structure is a cylinder with multiple grooves evenly arranged axially on the outer circumferential surface of the cylinder, and a linear guide pair is fixed in the groove; the clamping assembly includes a conical sleeve, the front end of the conical sleeve is an elastic conical section, and the rear end is a connecting section; the positioning structure includes a magnetic positioning unit and a circumferential limiting unit, the magnetic positioning unit has an annular groove machined on the end face of the guide structure, and a permanent magnet is embedded therein; a magnetic ring is fixedly installed at the tail of the welding torch cone handle; the circumferential limiting unit adopts a single key pin structure, with multiple elastically extendable spring pins arranged radially on the guide structure, the ends of the spring pins are provided with balls, and a single key groove matching the balls is machined at the tail of the welding torch cone handle.

2. The positioning fixture for an arc welding equipment according to claim 1, characterized in that: The linear guide pair consists of a guide rail and a slider. The guide rail is fixed to the guide structure by countersunk screws, and the top surface of the slider has a pre-drilled threaded hole.

3. The positioning fixture for an arc welding equipment according to claim 2, characterized in that: The tapered sleeve is provided with a connecting plate on the inner side of its rear end, and a through hole is provided on the tapered sleeve and the connecting plate. The tapered sleeve and the guide rail slider are fixed by bolts passing through the through hole and the threaded hole on the top surface of the slider.

4. The positioning fixture for an arc welding equipment according to claim 1, characterized in that: A locking ring is coaxially arranged on the outer side of the clamping assembly. The locking ring is in the shape of a hollow cylinder. The inner diameter of the locking ring is equal to the outer diameter of the tapered sleeve connecting section. The surface of the tapered sleeve connecting section is machined with protruding threads. The inner wall of the locking ring is machined with recessed internal threads. A spiral nylon ring formed by nylon strips is embedded in the internal threads. The diameter of the spiral nylon ring is smaller than the outer diameter of the tapered sleeve connecting section.

5. A positioning fixture for an arc welding equipment according to claim 4, characterized in that: The outer circumferential surface of the locking ring is machined with axial grooves that are evenly spaced.

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