Welding gun switching device suitable for spot welding system

Abstract

The utility model relates to the field of spot welding equipment, and discloses a welding gun switching device suitable for a spot welding system, which comprises a rotatable mechanical arm and two placing tables arranged on two opposite sides of the mechanical arm, each placing table is provided with a welding tool, the welding gun switching device further comprises a gun changing disc, the gun changing disc comprises a main disc and a tool disc, the main disc is detachably connected with the tool disc, one side of the main disc is connected with a positioning column, the tool disc is provided with a containing groove, the laser device further comprises a laser transmitter and a laser receiver, an opening is formed in the end face of the bottom of the positioning column, and the laser receiver is connected with the positioning column. The laser emitter is connected to the positioning column and emits laser outwards through the open hole, and the laser receiver is connected to the bottom face of the containing groove; on the basis that the positioning column is matched with the containing groove, accurate alignment is completed through the laser transmitter and the laser receiver, the connecting accuracy of the main disc and the tool disc is guaranteed, and follow-up spot welding operation can be smoothly conducted.

Description

Technical Field

[0001] The utility model relates to the field of spot welding equipment, in particular to a welding torch switching device applicable to a spot welding system. Background Art

[0002] In modern manufacturing, spot welding technology is widely used in the assembly processes of industries such as automobiles, household appliances, and aviation. To improve production efficiency, many production lines have introduced automated spot welding devices, among which the robotic arm is a key execution component. Existing robotic arms for spot welding are usually equipped with a gun changer, which can flexibly replace the welding torch or other welding tools;

[0003] Although the introduction of the gun changer has greatly improved the working efficiency of the robotic arm, in practical applications, there is still a problem of insufficient alignment accuracy during the automatic welding torch replacement process of the robotic arm. It can be understood that the gun changer usually consists of a main disk and a tool disk. The main disk is connected to the robotic arm, while the tool disk is connected to the welding torch. Quick and efficient replacement of the welding torch can be achieved by means of the detachable connection between the main disk and the tool disk. However, during the process of replacing the welding torch, the robotic arm reaches the predetermined position mainly by presetting the motion trajectory in advance to achieve positioning. The positioning method is single and the alignment accuracy is insufficient. If the main disk and the tool disk are not accurately aligned before connection, problems such as insecure connection or even inability to connect are likely to occur, thus affecting subsequent welding operations. Therefore, it is necessary to improve the alignment accuracy during the automatic welding torch replacement of the robotic arm. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a welding torch switching device applicable to a spot welding system to solve the problems of single positioning method and insufficient alignment accuracy between the robotic arm and the welding torch during the welding torch switching process. The specific technical solutions are as follows:

[0005] A welding torch switching device applicable to a spot welding system includes a rotatable robotic arm and two placement tables arranged on opposite sides of the robotic arm. Each placement table is configured with a welding tool. The device further includes a gun changer, which includes a main disk and a tool disk. The main disk is connected to the robotic arm, and each welding tool is connected to the tool disk. The main disk and the tool disk are detachably connected. A positioning post is connected to one side of the main disk, and the tool disk is provided with a receiving groove. The positioning post is detachably inserted into the receiving groove. An annular groove is provided on the inner wall of the receiving groove, and an elastic limiting ring is installed in the annular groove. The positioning post inserted into the receiving groove passes through the elastic limiting ring, and the elastic limiting ring is in interference fit with the positioning post.

[0006] Preferably, a buckle portion is connected to the outer side of the elastic limiting ring, and a clamping groove is provided on the inner wall of the annular groove to install the buckle portion.

[0007] Preferably, the buckle portion is annular, and the upper and lower end faces of the buckle portion are both contracted towards the middle.

[0008] Preferably, it further includes a laser emitter and a laser receiver. An opening is provided on the bottom end face of the positioning post. The laser emitter is connected to the positioning post and emits laser through the opening. The laser receiver is connected to the bottom surface of the receiving groove, and the laser receiver is used to receive the laser emitted by the laser emitter.

[0009] Preferably, it further includes a processing platform. The processing platform is arranged in front of the robotic arm and is located on the rotation path of the robotic arm.

[0010] Preferably, a plurality of vertically arranged lifting cylinders are provided on the processing platform.

[0011] Preferably, each lifting cylinder is connected with a lifting block.

[0012] The beneficial effects of the present utility model: On the basis of the cooperation between the positioning post and the receiving groove, the laser emitter and the laser receiver are used to complete precise alignment, ensuring the connection accuracy between the main disk and the tool disk, so that the subsequent spot welding operation can proceed smoothly. By using the cooperation between the buckle portion and the card slot, the elastic limiting ring can be firmly placed in the annular groove.

[0013] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. Of course, implementing any product or method of the present application does not necessarily require achieving all the above advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic structural diagram of the present utility model.

[0016] Figure 2 It is a schematic structural diagram of the robotic arm of the present utility model.

[0017] Figure 3 It is a schematic structural diagram of the welding tool of the present utility model.

[0018] Figure 4 It is a schematic structural diagram of the positioning post of the present utility model.

[0019] In the figure: 1. robotic arm; 2. placement table; 3. welding tool; 41. main disk; 42. tool disk; 51. positioning post; 52. receiving groove; 511. opening; 61. laser emitter; 62. laser receiver; 71. elastic limiting ring; 72. buckle part; 8. processing platform; 9. lifting cylinder; 10. lifting block. Specific embodiments

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. 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.

[0021] Reference to "embodiment" in this context means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase does not necessarily refer to the same embodiment at every occurrence in the specification, nor is it an independent or alternative embodiment mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0022] Based on the problems of single alignment method and insufficient alignment accuracy in the process of switching welding torches by using a robotic arm and a gun changer in the existing spot welding system, please refer to Figures 1-4 , the present invention provides some embodiments to solve the above problems. In the embodiments of the present invention, it specifically includes a rotatable robotic arm 1 and two placement tables 2 arranged on opposite sides of the robotic arm 1. Each placement table 2 is configured with a welding tool 3. It also includes a gun changer, which includes a main disk 41 and a tool disk 42. The main disk 41 is connected to the robotic arm 1, and each welding tool 3 is connected to a tool disk 42. The main disk 41 and the tool disk 42 are detachably connected. In specific applications, different welding tools 3 can be configured on the two placement tables 2, such as different types of welding torches;

[0023] The specific gun-changing principle is that the robotic arm 1 rotates to the placement table 2 corresponding to the welding torch (the welding torch connected to the robotic arm 1 at this time), the main disk 41 on the robotic arm 1 is separated from the tool disk 42 on the welding torch, and the welding torch is placed on the placement table 2 corresponding to the welding torch. The robotic arm 1 rotates to the placement table 2 corresponding to the target welding torch, and the main disk 41 of the robotic arm 1 is connected to the tool disk 42 of the current welding torch, thereby completing the gun change. There can be and only one welding tool 3 connected to the robotic arm 1.

[0024] Further, to improve the alignment accuracy between the main disk 41 and the tool disk 42, a positioning post 51 is connected to one side of the main disk 41. Specifically, the positioning post 51 is perpendicular to the main disk 41, and the tool disk 42 is provided with a receiving groove 52. The positioning post 51 is detachably inserted into the receiving groove 52. This embodiment further includes a laser emitter 61 and a laser receiver 62. An opening 511 is provided on the bottom end face of the positioning post 51. The laser emitter 61 is connected to the positioning post 51 and emits laser through the opening 511. The laser receiver 62 is connected to the bottom surface of the receiving groove 52 and is used to receive the laser emitted by the laser emitter 61. On the basis of the cooperation between the positioning post 51 and the receiving groove 52, the laser emitter 61 and the laser receiver 62 are used to complete precise alignment, ensuring the connection accuracy between the main disk 41 and the tool disk 42 and enabling the subsequent spot welding operation to proceed smoothly.

[0025] Generally, the robotic arm is usually controlled by a control platform. In this embodiment, the laser emitter 61 and the laser receiver 62 are respectively connected to the control platform in a signal connection manner.

[0026] In order to firmly place the positioning post 51 in the receiving groove 52, in some embodiments, an annular groove is provided on the inner wall of the receiving groove 52, and an elastic limiting ring 71 is installed in the annular groove. The positioning post 51 inserted into the receiving groove 52 passes through the elastic limiting ring 71, and the elastic limiting ring 71 is in interference fit with the positioning post 51. The elastic limiting ring 71 can be used to limit the positioning post 51, thereby realizing the above-mentioned relatively firm setting of the positioning post 51 in the receiving groove 52.

[0027] On the basis of the above embodiment, since the elastic limiting ring 71 is in interference fit with the positioning post 51, every time the main disk 41 and the tool disk 42 are separated, the positioning post 51 will be pulled out of the elastic limiting ring 71 at the same time. Therefore, it is necessary to improve the structure of the elastic limiting ring 71 to ensure that when the positioning post 51 is pulled out of the elastic limiting ring 71, the elastic limiting ring 71 is not easily pulled out together with the positioning post 51. Specifically, a buckle portion 72 is connected to the outer side of the elastic limiting ring 71, and a clamping groove is provided on the inner wall of the annular groove to install the buckle portion 72. That is, the buckle portion 72 protrudes from the side of the elastic limiting ring 71. When the elastic limiting ring 71 is installed in the annular groove, the buckle portion 72 extends into the clamping groove. The cooperation between the buckle portion 72 and the clamping groove enables the elastic limiting ring 71 to be firmly placed in the annular groove.

[0028] Preferably, the buckle portion 72 is in a circular ring shape, and the two end faces of the buckle portion 72 gradually contract from the inside to the outside towards the middle of the two end faces, that is, the cross-sectional view of the buckle portion 72 is in a frustum shape, and the shape of the card slot is also adapted to the shape of the buckle portion 72. In this embodiment, defining the shape of the buckle portion 72 helps to install the buckle portion 72. It can be understood that since the two end faces of the buckle portion 72 gradually contract from the inside to the outside towards the middle of the two end faces or the upper and lower end faces of the buckle portion 72 both contract towards the middle, the two end faces of the buckle portion 72 can play a guiding role during installation, making it easier to enter the card slot. Secondly, the materials of the elastic limiting ring 71 and the buckle portion 72 are both rubber or silica gel, with certain deformation ability, and the elastic limiting ring 71 and the buckle portion 72 are squeezed into the corresponding annular grooves and card slots.

[0029] In some embodiments, it further includes a processing platform 8. The processing platform 8 is arranged in front of the robotic arm 1, and the processing platform 8 is located on the rotation path of the robotic arm 1. The processing platform 8 can be one or more. A number of vertically arranged lifting cylinders 9 are provided on the processing platform 8, and each lifting cylinder 9 is connected to a lifting block 10. By arranging the lifting cylinders 9 on the processing platform 8, the height of the object to be processed can be adjusted as needed.

[0030] It should be noted that the terms "first", "second", etc. in this article are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include one or more of the said features.

[0031] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present utility model.

Claims

1. A welding gun switching device suitable for a spot welding system, characterized in that: It includes a gun changing tray, a laser transmitter, a laser receiver, a rotatable mechanical arm and two placement tables arranged on opposite sides of the mechanical arm, each of the placement tables is equipped with a welding tool, the gun changing tray includes a main tray and a tool tray, the main tray is connected to the mechanical arm, each of the welding tools is connected to the tool tray, the main tray and the tool tray are detachably connected, one side of the main tray is connected to a positioning column, the tool tray is provided with a receiving groove, the positioning column is detachably inserted in the receiving groove, the bottom end surface of the positioning column is provided with an opening, the laser transmitter is connected to the positioning column and the laser transmitter emits laser to the outside through the opening, the laser receiver is connected to the bottom surface of the receiving groove, and the laser receiver is used to receive the laser emitted by the laser transmitter.

2. A welding gun switching device suitable for a spot welding system according to claim 1, characterized in that: The inner wall of the receiving groove is provided with an annular groove, an elastic limiting ring is installed in the annular groove, the positioning column inserted in the receiving groove passes through the elastic limiting ring, and the elastic limiting ring and the positioning column are interference fit.

3. A welding gun switching device suitable for a spot welding system according to claim 2, characterized in that: The outer side of the elastic limiting ring is connected with a buckle part, and the inner wall of the annular groove is provided with a clamping groove for installing the buckle part.

4. A welding gun switching device suitable for a spot welding system according to claim 3, characterized in that: The buckle portion is in a circular ring shape, and the upper end surface and the lower end surface of the buckle portion are both contracted toward the middle.

5. A welding gun switching device suitable for a spot welding system according to claim 1, characterized in that: It also includes a processing platform, which is arranged in front of the robot arm and is located on the rotation path of the robot arm.

6. A welding gun switching device suitable for a spot welding system according to claim 5, characterized in that: The processing platform is provided with a plurality of vertically arranged lifting cylinders.

7. A welding gun switching device suitable for a spot welding system according to claim 6, characterized in that: The lifting cylinder is connected with a lifting block.

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