Welding mould assembly for ultrathin steel plate

Abstract

The utility model discloses a welding mould assembly for an ultra-thin steel plate, which solves the problems of low operation efficiency, to-be-improved welding quality and inconvenience in detection in the existing welding of the ultra-thin steel plate. The welding mould assembly for the ultra-thin steel plate comprises an upper mould, a lower mould and a rotary working table for clamping the lower mould, one side of the rotary working table is connected with the rear end of a supporting arm, the front end of the supporting arm is connected with an idler wheel through a downward pressing elastic device, and an annular upper groove is formed in the middle of the idler wheel. According to the assembly, the main polar plate and the polar frame can be rapidly welded, the height difference, caused after welding, of the main polar plate and the polar frame assembly can be reduced, and unqualified welding seams can be detected.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to a welding jig assembly for ultra-thin steel plates. Background Art

[0002] Hydrogen has received extensive attention as a renewable and clean energy source. Electrode frame components, as the main assembly parts of electrolyzers, play an important role in the hydrogen energy industry.

[0003] The pole frame assembly is mainly welded by the pole frame and the stamped main pole plate. Since the two products are made of different materials and the welding part between the pole frame and the main pole plate is very thin, with the thinnest part being only 1.2mm, deformation is very easy to occur during welding.

[0004] The usual processing and welding method is to use upper and lower jigs for welding the pole frame assembly, that is, placing the pole frame and the main pole plate on the lower jig, and then placing a heavier upper jig on the main pole plate, relying on the gravity of the upper jig to balance the deformation caused by welding.

[0005] However, this welding method has the following problems:

[0006] (1) Due to the limited gravity of the jig, it is impossible to completely balance the deformation caused by welding, resulting in the misalignment of the main pole plate and the pole frame;

[0007] (2) The weld has height requirements. The weld height of the product needs to be tested after welding. Products that exceed the tolerance need to be polished and ground, which takes a long time to test.

[0008] (3) Products with large misalignment will affect subsequent processing and assembly. Repairing the misalignment requires manual use of a copper hammer to repeatedly hit the misalignment, which is time-consuming and inefficient. Summary of the invention

[0009] The purpose of the utility model is to solve the above technical problems and to provide a welding jig assembly for ultra-thin steel plates which has a simple structure, is easy to operate, has high operating efficiency, can reduce the height difference between the main pole plate and the pole frame assembly caused by welding, can detect unqualified welds, and improve welding accuracy.

[0010] The utility model discloses a welding jig assembly for ultra-thin steel plates, comprising an upper jig, a lower jig and a rotating worktable for clamping the lower jig, one side of the rotating worktable is connected to the rear end of a support arm, the front end of the support arm is connected to a roller via a downward pressing elastic device, and the middle part of the roller is provided with an annular upper groove.

[0011] Preferably, an annular lower groove is formed on the top surface of the lower mold corresponding to the weld between the main pole plate and the pole frame.

[0012] Preferably, the depth of the upper groove is the maximum allowable weld height.

[0013] Preferably, the downward pressure elastic device includes an outer cylinder and a supporting cylinder mounted inside the outer cylinder, and a movable rod is provided inside the supporting cylinder; the outer cylinder and the supporting cylinder are connected via an adjusting device, the upper end of the movable rod is connected to the supporting cylinder, and the lower end is connected to the roller via a bearing.

[0014] Preferably, the adjustment device includes an upper adjustment bolt, a lower adjustment bolt and an upper adjustment nut, a threaded hole is provided on one side of the outer tube, and a through hole is provided on the other side; the lower adjustment bolt is threadedly connected to the threaded hole and the lower end contacts the top surface of the support tube; the lower end of the upper adjustment bolt passes through the through hole and is threadedly connected to the support tube, and the upper adjustment nut is threadedly mounted on the upper adjustment bolt located outside the outer tube.

[0015] Preferably, the movable rod is composed of a thin rod in the upper section and a thick rod in the lower section, and a compression spring is sleeved on the thin rod.

[0016] Preferably, the upper end of the thin rod passes through the support tube and is threadedly connected to the suspension nut.

[0017] Preferably, the support arm consists of a vertical arm and a horizontal arm, and the front end of the vertical arm and the rear end of the horizontal arm are connected via a rotating shaft; the connection between the vertical arm and the horizontal arm is also connected via a limiting pin.

[0018] The utility model discloses a welding method for ultra-thin steel plates, using the above-mentioned ultra-thin steel plate welding jig assembly, and the specific method is as follows:

[0019] 1) Place the lower mold on the working surface of the rotating workbench and clamp it;

[0020] 2) placing the main pole plate and pole frame on the lower jig, with the bottom surfaces of the parts to be welded placed in the annular lower groove, and placing the upper jig on the main pole plate;

[0021] 3) placing the upper groove of the roller corresponding to the top surface of the part to be welded, and adjusting the downward pressure elastic device so that the roller contacts the top surface of the part to be welded and applies a vertical downward force;

[0022] 4) During welding, the welding gun is located in front of the roller, and the rotating worktable is started to drive the main pole plate and the pole frame to rotate accordingly. The welding gun performs welding operations along the welding position. The pole frame and the main pole plate around the weld are in a high temperature state. Subsequently, the roller is used to roll the pole to minimize the height difference formed after welding.

[0023] Preferably, the method further comprises the following steps:

[0024] 5) For the positions where the weld height is too high and unqualified, when the roller passes by, it will move upward due to the impact, and there will be more obvious vibration and sound. You only need to mark the weld at that location, and after welding, grind the marked position for excess height.

[0025] In view of the problems existing in the background technology, the inventor has improved the existing rotary workbench by connecting the roller through the support arm and the downward pressure elastic device. In this way, the downward pressure elastic device is used to apply downward pressure to the roller, and the main pole plate and pole frame on both sides of the weld will be rolled once. Since the roller is closely behind the welding gun, the welding temperature is high and the material plasticity is high. After the two sides are subjected to force, the height difference between the main pole plate and the pole frame assembly caused by welding can be greatly reduced. Since the middle part of the specially designed roller is provided with an annular upper groove, the weld is located exactly at the annular upper groove, and the weld itself will not be squeezed during the rolling process. Further, the depth of the upper groove is cleverly controlled to be the maximum allowable weld height, so that during the rolling process, if the roller is highly qualified, it will directly pass over the weld; if the weld is unqualified, it will be higher than the depth of the upper groove, so that the roller is impacted, moves upward, and passes over, causing abnormal vibration or sound. For such positions, it is only necessary to mark them well, and after welding, the weld is polished to remove the excess height. Preferably, an annular lower groove is formed on the top surface of the lower jig corresponding to the weld between the main pole plate and the pole frame to prevent adhesion after welding, which would make it impossible to remove the workpiece after welding.

[0026] In order to achieve the purpose of adjustable roller height and elastic downward pressure, an outer cylinder, a support cylinder and a movable rod are designed. An adjustment device is set between the outer cylinder and the support cylinder to adjust the distance between the two to control the height of the roller, and a compression spring sleeved on a thin rod is set between the outer cylinder and the thick rod of the movable rod to achieve the purpose of elastic downward pressure. The upper end of the thin rod passes through the support cylinder and is threadedly connected to the suspension nut. The suspension nut can be used to adjust the extension length of the thin rod, and then adjust the preload of the compression spring, and finally achieve the purpose of flexibly controlling the downward pressure of the roller.

[0027] The utility model has a simple component structure, is easy to transform, has high operating efficiency, can effectively improve welding accuracy, greatly reduces the amount of misalignment, and does not need to detect the weld height separately, which greatly improves product quality and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is the welding assembly drawing;

[0029] Figure 2 This is a partial enlarged view of the upper part;

[0030] Figure 3 It is a partial enlarged view of the lower half;

[0031] In the figure: 1-rotating workbench; 2-main pole plate; 3-upper jig; 4-pole frame; 5-lower jig; 5.1-lower groove; 6-support arm; 6.1-vertical arm; 6.2-cross arm; 6.3 limit pin; 6.4 limit pressure plate; 7-lower adjustment bolt; 8-outer cylinder; 8.1-threaded hole; 8.2-through hole; 9-upper adjustment bolt; 10-upper adjustment nut; 11-suspension nut; 12-support cylinder; 13-compression spring; 14-movable rod; 14.1-thin rod; 14.2-thick rod; 15-roller; 15.1-upper groove; 16-roller bearing; 17-weld. DETAILED DESCRIPTION

[0032] The utility model is further explained below in conjunction with the accompanying drawings:

[0033] See also Figure 1 The welding jig assembly for ultra-thin steel plates includes an upper jig 3, a lower jig 5 and a rotating worktable 1 for clamping the lower jig 5. One side of the rotating worktable 1 is connected to the rear end of a support arm 6. The support arm 6 is composed of a vertical arm 6.1 and a horizontal arm 6.2. The front end of the vertical arm 6.1 is connected to the rear end of the horizontal arm 6.2; the connection between the vertical arm 6.1 and the horizontal arm 6.2 is also connected via a limit pin 6.3 and a limit pressure plate 6.4.

[0034] The front end of the support arm 6 is connected to the roller 15 via a downward elastic device, see Figure 3 The middle of the roller 15 is provided with an annular upper groove 15.1. Preferably, the depth of the upper groove 15.1 is the maximum allowable height of the weld 17, which not only ensures that the welding quality will not be affected during the downward pressure operation, but also can identify the qualified weld height. The top surface of the lower jig 5 is provided with an annular lower groove 5.1 at the weld 17 of the main pole plate 2 and the pole frame 4, so that the bottom surface of the weld 17 and the lower jig 5 are kept at a certain distance to prevent adhesion after welding, which makes it impossible to remove the workpiece after welding.

[0035] See also Figure 2 The downward pressure elastic device includes an outer tube 8 and a support tube 12 sleeved in the outer tube 8, and a movable rod 14 is arranged in the support tube 12; the outer tube 8 and the support tube 12 are connected via an adjustment device. The adjustment device includes an upper adjustment bolt 9, a lower adjustment bolt 7 and an upper adjustment nut 10, and a threaded hole 8.1 is arranged on one side of the outer tube 8, and a through hole 8.2 is arranged on the other side; the lower adjustment bolt 7 is threadedly connected with the threaded hole 8.1 and the lower end contacts the top surface of the support tube 12; the lower end of the upper adjustment bolt 9 passes through the through hole 8.2 and is threadedly connected with the support tube 12, and the upper adjustment nut 10 is threadedly sleeved on the upper adjustment bolt 9 located outside the outer tube 8.

[0036] The movable rod 14 is composed of a thin rod 14.1 at the upper section and a thick rod 14.2 at the lower section. A compression spring 13 is mounted on the thin rod 14.1 and the upper end of the thin rod 14.1 passes through the support tube 12 and is threadedly connected to the suspension nut 11; the lower end of the thick rod 14.2 is installed with a roller 15 via a roller bearing 16.

[0037] The specific welding method is:

[0038] 1) placing the lower mold 5 on the working surface of the rotating workbench 1 and clamping it;

[0039] 2) placing the main pole plate 2 and pole frame 4 on the lower jig 5, with the bottom surfaces of the parts to be welded being placed at the annular lower groove 5.1, and placing the upper jig 3 on the main pole plate 2;

[0040] 3) Rotate the horizontal arm 6.2 of the support arm 6 so that it rotates around the vertical arm 6.1, driving the downward pressure elastic device and the roller 15 to move to the top of the part to be welded, and make the upper groove 15.1 correspondingly placed on the top surface of the part to be welded, tighten the limit pin 6.3 to limit the movement of the horizontal arm 6.2, and adjust the downward pressure elastic device so that the roller contacts the top surface of the part to be welded and applies a vertical downward force;

[0041] The specific adjustment method is: rotate the upper adjusting nut 10 counterclockwise to contact the upper adjusting bolt 9, and then rotate the lower adjusting bolt 7 clockwise. Due to the thread transmission, the support tube 12 will move downward at this time. Since the bottom of the roller 15 is in contact with the pole frame 4 and cannot move downward, the roller 15 is acted upon by the compressed spring 13 to apply a downward pressure to the pole frame 4 and the main pole plate 2.

[0042] 4) During welding, the welding gun is located 10 mm in front of the roller, the rotating worktable 1 is started to drive the main pole plate 2 and the pole frame 4 to rotate accordingly, and the welding gun performs welding operations along the welding position. The pole frame 2 and the main pole 4 plate around the weld 17 are in a high temperature state, and then the roller 15 is used to roll to minimize the height difference (misalignment) formed after welding.

[0043] 5) For the position where the weld 17 is too high and unqualified, when the roller 15 passes by, it will move upward due to the impact, causing more obvious vibration and sound. It is only necessary to mark the weld 17 at that location, and after welding, grind the marked position for excess height.

[0044] After the workpiece is welded, it is only necessary to rotate the lower adjusting bolt 7 counterclockwise to disengage it from the contact with the support tube 12, and at the same time rotate the upper adjusting nut 10 clockwise to pull up the support tube 12 through the upper adjusting bolt 9. After the support tube 12 moves until the compression spring 13 is in a free state, the entire roller 15 component can be lifted up by the suspension nut 11 to disengage it from the contact with the workpiece; finally, loosen the limit pin 6.3 to release the limit, and rotate the cross arm 6.2 to move the roller 15 away from above the workpiece.

Claims

1. A welding jig assembly for ultra-thin steel plates, comprising an upper jig, a lower jig and a rotating worktable for clamping the lower jig, characterized in that: One side of the rotating workbench is connected to the rear end of the supporting arm, the front end of the supporting arm is connected to the roller via a downward pressing elastic device, and the middle part of the roller is provided with an annular upper groove.

2. The ultra-thin steel plate welding jig assembly according to claim 1, characterized in that: The top surface of the lower mold is provided with an annular lower groove corresponding to the welding seam between the main pole plate and the pole frame.

3. The ultra-thin steel plate welding jig assembly according to claim 1, characterized in that: The depth of the upper groove is the maximum allowable weld height.

4. The ultra-thin steel plate welding jig assembly according to any one of claims 1 to 3, characterized in that: The downward pressure elastic device includes an outer tube and a support tube sleeved in the outer tube, and a movable rod is arranged in the support tube; the outer tube and the support tube are connected via an adjustment device, the upper end of the movable rod is connected to the support tube, and the lower end is connected to the roller via a bearing.

5. The ultra-thin steel plate welding jig assembly according to claim 4, characterized in that: The adjusting device comprises an upper adjusting bolt, a lower adjusting bolt and an upper adjusting nut. A threaded hole is provided on one side of the outer tube, and a through hole is provided on the other side. The lower adjusting bolt is threadedly connected to the threaded hole and the lower end contacts the top surface of the supporting tube. The lower end of the upper adjusting bolt passes through the through hole and is threadedly connected to the supporting tube, and the upper adjusting nut is threadedly mounted on the upper adjusting bolt located outside the outer tube.

6. The ultra-thin steel plate welding jig assembly according to claim 4, characterized in that: The movable rod is composed of a thin rod in the upper section and a thick rod in the lower section. A compression spring is sleeved on the thin rod. The upper end of the thin rod passes through the support tube and is threadedly connected with a suspension nut.

7. The ultra-thin steel plate welding jig assembly according to claim 1, characterized in that: The support arm consists of a vertical arm and a horizontal arm. The front end of the vertical arm and the rear end of the horizontal arm are connected via a rotating shaft. The connection between the vertical arm and the horizontal arm is also connected via a limiting pin.

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