Automatic spot welding equipment for joints and pipe fittings

Abstract

The utility model discloses automatic spot welding equipment for joints and pipe fittings, and belongs to the technical field of welding. Comprising a joint base for placing a joint; the joint lifting mechanism is used for adjusting the height of the joint base; the visual sensor is used for acquiring position images of the joint and the pipe fitting; the robot is in communication connection with the visual sensor and used for grabbing the pipe fitting and adjusting the position angle of the pipe fitting; the welding mechanism is used for welding the joints and the pipe fittings; and the actuating mechanism is used for adjusting the welding mechanism to move towards the joint base. The automatic spot welding equipment disclosed by the utility model is high in automation degree and good in welding effect, and the welding time and the labor and tool cost are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to an automatic spot welding device for joints and pipe fittings. Background Art

[0002] Spot welding is a welding method in which the parts to be welded are assembled into overlapping joints and pressed between two electrodes, and the parent metal is melted by resistance heat to form a weld.

[0003] In the process of catheter production, there is a process called argon arc spot welding between the pipe fittings and the joints. This step is used to ensure the relative position of the joints and pipe fittings is accurate, thus laying a good foundation for the subsequent argon arc welding. Figure 1 As shown, this step is currently performed manually, and during the spot welding process, the relative positions of the pipe fittings and the joints need to be positioned by tooling. One configuration of the catheter corresponds to one tooling, and the tooling is not interchangeable. This results in the need to prepare a large number of tooling during the process, which is very costly, and because the entire process is manually operated, the consistency is poor. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model aims to provide an automatic spot welding device with high automation, good welding effect consistency and no need for additional tooling.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An automatic spot welding device for joints and pipe fittings comprises a joint base for placing the joint; a joint lifting mechanism for adjusting the height of the joint base; a visual sensor for acquiring position images of the joint and the pipe fitting; a robot connected to the visual sensor for grabbing the pipe fitting and adjusting the position angle of the pipe fitting; a welding mechanism for welding the joint and the pipe fitting; and an actuating mechanism for adjusting the movement of the welding mechanism toward the joint base.

[0007] Preferably: it also includes a bearing platform; the joint base is installed in the middle of the bearing platform, and the joint lifting mechanism is located below the bearing platform and connected to the joint base.

[0008] Preferably, the welding mechanism comprises two pairs of welding guns mounted on welding gun seats; each pair of welding guns are symmetrically arranged at opposite corners of the bearing platform.

[0009] Preferably: the bearing platform is grooved on both sides of the welding gun seat, and a slide rail is provided between the two grooves for the welding gun seat to slide toward the joint base, the actuating mechanism includes a connecting rod connecting adjacent welding gun seats and a driving assembly driving the two adjacent connecting rods to move closer or farther away; the connecting rod is rotatably connected to the welding gun seat; the connecting rod and the driving assembly are both installed under the bearing platform.

[0010] Preferably, there are two groups of visual sensors, each group of visual sensors includes a transmitting end and a receiving end symmetrically arranged on both sides of the joint base.

[0011] Preferably: a vent is provided on the joint base.

[0012] Compared with the prior art, the utility model improves the original manual positioning welding in the welding process into automatic welding after positioning and adjustment of the welding equipment, which reduces human intervention, greatly reduces working time, improves work efficiency, greatly improves the consistency of the joint and the pipe after welding, and improves the welding quality. In addition, in long-term use, the whole process does not require additional tooling, reduces production costs, and outputs the relative positioning data of the joint and the pipe after spot welding, which is more convenient for later quality inspection and tracing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of welding joints and pipe fittings in the prior art.

[0014] Figure 2 This is a top view of the spot welding equipment structure;

[0015] Figure 3 This is a structural diagram viewed from above;

[0016] Figure 4 This is the cross-sectional view at SS;

[0017] Figure 5 This is the enlarged view of point A;

[0018] Figure 6 This is the schematic diagram of visual correction.

[0019] In the figure: 1. Carrying platform; 2. Joint base; 21. Vent; 3. Joint lifting mechanism; 4. Visual sensor; 41. Transmitter; 42. Receiving end; 5. Welding gun; 51. Welding gun seat; 6. Slide rail; 7. Connecting rod; 8. Driving assembly. DETAILED DESCRIPTION

[0020] The structure and principle of the utility model are now fully explained in combination with the prior art so that ordinary technicians in the field can fully understand and implement it.

[0021] like Figure 2 , Figure 3 , Figure 6 As shown, the utility model discloses an automatic spot welding device for joints and pipe fittings, comprising a square bearing platform 1. A joint base 2 is installed in the middle of the bearing platform 1 for placing the joint to be welded.

[0022] The joint lifting mechanism 3 is located below the carrying platform 1 and is fixedly connected to the joint base 2 , and is used to adjust the height of the joint base 2 .

[0023] The visual sensor 4 is used to obtain the position image of the joint to be welded and the pipe fitting. There are two groups of visual sensors 4, and each group of visual sensors 4 includes a transmitting end 41 and a receiving end 42 symmetrically arranged on both sides of the joint base 2. The relative position of the joint to be welded and the pipe fitting is obtained by the visual sensor 4. Among them, the image acquisition directions of the two groups of visual sensors 4 are perpendicular to each other (the connecting line of the transmitting end 41 and the receiving end 42), and the transmitting end 41 and the receiving end 42 are both arranged in the middle of each side of the carrying platform 1.

[0024] The robot (the visual sensor 4 is connected to the robot in communication) is used to grab the joints and pipes and adjust the position angle of the pipes according to the feedback image of the visual sensor 4 (not marked in the figure).

[0025] The welding mechanism is used for welding joints and pipe fittings. The welding mechanism comprises two pairs of welding guns 5 mounted on welding gun seats 51 ; each pair of welding guns 5 is symmetrically arranged at opposite corners of the carrying platform 1 .

[0026] In such Figure 4 As shown, in this embodiment, the supporting platform 1 is grooved on both sides of the welding gun 5 (shown in the figure m), the welding gun seat 51 is located below the supporting platform 1, and a slide rail 6 is provided between the two grooves for the welding gun seat 51 to slide toward the joint base 2, and the welding gun seat 51 is clamped on the slide rail 6; the welding gun 5 is fixedly connected to the welding gun seat 51 through the grooves on both sides of the shell.

[0027] The actuating mechanism is used to adjust the movement of the welding mechanism toward the joint base 2. The actuating mechanism includes a connecting rod 7 (such as Figure 5 As shown, the connecting rod 7 is rotatably connected to the welding gun seat 51 through a connecting shaft, and a driving assembly 8 is used to drive two adjacent connecting rods 7 to move closer or farther away; the connecting rod 7 and the driving assembly 8 are both installed below the carrying platform 1. Figure 3 As shown, the connecting rods 7 (4 pieces) connecting the adjacent welding gun seats 51 form a four-bar structure, and the driving assembly 8 (an electric push rod in this embodiment, the motor drives the push rod to extend or compress to both ends, and the push rod is sleeved / slidably connected to the two adjacent connecting rods 7) drives the two pairs of welding guns 5 to move toward / away from the joint base 2 in turn; wherein the shape of the connecting rod 7 is not limited to the straight rod in this embodiment. In a preferred embodiment, in order to facilitate installation and movement, the connecting rod 7 can be designed to be an inwardly concave bow shape.

[0028] During operation, the robot grabs the joint to be welded and places it on the joint base 2, and adjusts it to a suitable height through the joint lifting mechanism 3 (to ensure that joints of different specifications can meet the welding conditions); the robot grabs the pipe to be welded to the top of the joint base 2, that is, the relative position of the joint welding; the visual sensor 4 obtains the relative position image of the joint and the pipe and adjusts it in time to achieve parallel angles between the axes of the joint and the pipe, and the horizontal deviation is 0. After the feedback images of the two sets of visual sensors 4 are adjusted, the welding conditions are achieved (such as Figure 6 The diagram shows the principle of position adjustment, i.e. each group of visual sensors 4 adjusts the axis angle α / β to 0, i.e. angle adjustment is achieved; the horizontal position a / b is 0, i.e. horizontal deviation adjustment is achieved); two pairs of welding guns 5 are moved to the welding point in turn through the actuating mechanism for welding.

[0029] It is further provided that the joint base 2 is provided with a vent 21 so as to allow the introduction of protective argon gas during spot welding to ensure welding quality.

[0030] The utility model adopts robots and visual positioning to ensure the automation of the spot welding process between the joint and the catheter. It can be completed without manual labor and additional tooling, and the welding effect is reliable and consistent. The robot can also output the relative positioning data of the joint and the pipe fitting, which is convenient for later quality inspection and tracing, greatly improving work efficiency.

[0031] The above embodiments are only preferred embodiments of the present invention, and are not any formal limitations on the present invention. Any technician familiar with the art can use the above disclosed method to make many possible changes and modifications to the technical solution of the present invention without departing from the technical principle and solution scope of the present invention, or modify it into an equivalent embodiment with equivalent changes. Therefore, any combination, modification or replacement of the technical features disclosed in the present invention based on the technical essence of the present invention without departing from the principle or solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. An automatic spot welding device for joints and pipe fittings, characterized in that: It comprises a joint base (2) for placing the joint to be welded; a joint lifting mechanism (3) for adjusting the height of the joint base (2); a visual sensor (4) for acquiring a position image of the joint and the pipe fitting; a robot connected to the visual sensor (4) for grasping the joint and the pipe fitting and adjusting the position angle of the pipe fitting; a welding mechanism for welding the joint and the pipe fitting; and an actuating mechanism for adjusting the movement of the welding mechanism toward the joint base (2).

2. An automatic spot welding device for joints and pipe fittings as claimed in claim 1, characterized in that: It also comprises a bearing platform (1); the joint base (2) is mounted in the middle of the bearing platform (1); and the joint lifting mechanism (3) is located below the bearing platform (1) and is fixedly connected to the joint base (2).

3. An automatic spot welding device for joints and pipe fittings as claimed in claim 2, characterized in that: The bearing platform (1) is square, and the welding mechanism comprises two pairs of welding guns (5) mounted on welding gun seats (51); each pair of welding guns (5) is symmetrically arranged at opposite corners of the bearing platform (1).

4. An automatic spot welding device for joints and pipe fittings as claimed in claim 3, characterized in that: The bearing platform (1) is grooved on both sides of the welding gun seat (51), and a slide rail (6) is provided between the two grooves for the welding gun seat (51) to slide toward the joint base (2). The actuating mechanism comprises a connecting rod (7) connecting adjacent welding gun seats (51) and a driving assembly (8) driving two adjacent connecting rods (7) to move closer or farther away. The connecting rod (7) is rotatably connected to the welding gun seat (51).

5. The automatic spot welding equipment for joints and pipe fittings according to claim 3, characterized in that: There are two groups of visual sensors (4), and each group of visual sensors (4) comprises a transmitting end (41) and a receiving end (42) symmetrically arranged on both sides of the joint base (2).

6. An automatic spot welding device for joints and pipe fittings according to any one of claims 1 to 5, characterized in that: A vent (21) is provided on the joint base (2).

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