Semi-automatic welding machine for thin plate and cylindrical part

Abstract

The semi-automatic welding machine comprises a welding gun and a clamp, the clamp is provided with two opposite clamping arms, and the two ends of a cylinder are clamped between the two clamping arms; comprising a lifting assembly connected to a clamp, a heat conduction piece and a positive pressing piece are sequentially arranged at the lower end of the lifting assembly, the lower surface of the positive pressing piece is an arc face, the lifting assembly drives the heat conduction piece and the positive pressing piece to press a thin plate to the outer surface of a cylinder, and then the welding edge of the thin plate is tightly attached to the outer surface of the cylinder; comprising a moving assembly, the welding gun is installed on the moving assembly, and the moving assembly drives the welding gun to move along a welding edge. The technical problem that the to-be-welded edge cannot be attached is solved, then the moving assembly drives the welding gun to complete automatic continuous welding along the to-be-welded edge, the probability of welding quality problems such as welding air holes and cracks is greatly reduced, welding seams are uniform, the welding time is short, and the efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of semi-automatic welding machine, and particularly relates to a semi-automatic welding machine for thin plate and cylindrical workpiece. BACKGROUND

[0002] For the conventional welding of super-thin plate, super-thin plate and other super-thin workpieces, argon arc welding, laser welding, roll welding and other welding methods are often selected. For example, the welding of two thin plates, the two thin plates are overlapped and aligned on the two sides to be welded, and the two sides to be welded are naturally close after the two thin plates are overlapped, so the welding difficulty is low, and the welding can be performed manually.

[0003] However, for workpieces whose welding edges cannot be naturally attached or cannot be attached by using conventional clamps, the welding difficulty is high, and welding quality problems are prone to occur. For example, 0.2, 0.1 or thinner super-thin plates are bent and welded to the outer surface of a cylinder, but the thin plates have stress after being bent, and the edges to be welded cannot be completely attached to the outer surface of the cylinder. In addition, in order to meet the sealing requirements of the workpiece, spot welding cannot be used, only continuous welding can be used, and welding quality problems such as porosity and cracks are prone to occur in the unattached places.

[0004] In view of the above problems, there is no special automatic welding machine or special semi-automatic welding machine for thin plates and cylindrical workpieces at present. If a special welding machine is designed for a certain size of cylinder and corresponding thin plate, it does not have universality and the cost is too high. If conventional tools such as clamps and blocks are used, it is difficult to completely attach each place of the edge to be welded, even if it can be completely attached, it takes too long time, which seriously affects the welding efficiency. Therefore, there is a lack of an automatic welding machine or a semi-automatic welding machine for thin plates and cylindrical workpieces with universality. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a semi-automatic welding machine for thin plates and cylindrical workpieces, which comprises a welding gun and a clamp, the clamp is provided with two opposite clamping arms, and the two ends of the cylinder are clamped between the two clamping arms; a lifting assembly connected to the clamp, the lower end of the lifting assembly is provided with a heat conducting piece and a positive pressure piece in sequence, and the lower surface of the positive pressure piece is a circular arc surface, the heat conducting piece and the positive pressure piece are driven by the lifting assembly to press the thin plate against the outer surface of the cylinder, so that the welding edge of the thin plate is attached to the outer surface of the cylinder; a moving assembly, the welding gun is installed on the moving assembly, and the welding gun is moved along the welding edge by the moving assembly.

[0006] The preferred scheme of the semi-automatic welding machine for the sheet and the cylindrical piece in the application is that the clamp comprises a cross arm, two clamping arms are respectively installed at two ends of the cross arm, and the spacing between the two clamping arms is adjustable. A sliding groove is arranged on the cross arm, the upper end of the clamping arm is in sliding connection with the sliding groove, and the spacing between the two clamping arms can be adaptively adjusted according to the axial length of the cylinder, so that the clamp is suitable for cylinders of different lengths, and the speciality and universality are considered.

[0007] The preferred scheme of the semi-automatic welding machine for the sheet and the cylindrical piece in the application is that the lifting assembly comprises two pre-tightening screws and at least one locking screw, the two pre-tightening screws and all the locking screws are connected with the cross arm through threads, and the lower ends of all the locking screws are opposite to the heat conduction piece. The two pre-tightening screws are respectively close to the two ends of the cross arm, and all the locking screws are located between the two pre-tightening screws. Further, a spring is arranged between the lower end of each pre-tightening screw and the heat conduction piece, the lower end of each spring is fixedly connected with the heat conduction piece, and the upper end is rotatably connected with the corresponding pre-tightening screw. The sheet is placed on the outer surface of the cylinder, the two sides of the sheet are pre-tightened by using the two pre-tightening screws, then the position of the sheet is accurately adjusted, and finally the position of the sheet after adjustment is locked by the locking screw, so that the position of the sheet is quickly locked, and the positioning workload in the early stage of welding is reduced.

[0008] The preferred scheme of the semi-automatic welding machine for the sheet and the cylindrical piece in the application is that the heat conduction piece is provided with a cooling channel, and the positive pressure piece is fixedly connected to the lower surface of the heat conduction piece. The positive pressure piece comprises an arc-shaped bottom wall and a corrugated top wall, and a cavity is formed between the arc-shaped bottom wall and the corrugated top wall. The elastic modulus of the corrugated top wall, the elastic modulus of the arc-shaped bottom wall and the elastic modulus of the sheet decrease in turn. The cavity is filled with a heat conduction agent, the lower surface of the heat conduction piece penetrates through the corrugated top wall and extends into the cavity, and the lower surface of the heat conduction piece is provided with a plurality of heat conduction support pieces which extend downward and are close to the arc-shaped bottom wall. On the one hand, the cooling channel of the heat conduction piece is connected with an external cooling device, the cooling liquid of the cooling device flows through the cooling channel, and a large amount of heat generated during the welding process is taken away by the cooling liquid, so that the sheet is effectively prevented from deforming due to slow heat dissipation speed, and the welding seam quality is improved. On the other hand, the positive pressure piece can press the to-be-welded edge of the sheet against the outer surface of the cylinder through deformation, effectively solving the problem that the to-be-welded edge cannot be attached.

[0009] The preferred scheme of the semi-automatic welding machine for the thin plate and the cylindrical piece in the application is as follows: the shape of the heat conduction piece is a rectangular body, the length direction of the heat conduction piece is parallel to the cross arm, the heat conduction piece is provided with a groove extending along the length direction and a T-shaped limiting groove; the groove is provided with two, and the two grooves are respectively located on the upper surface and the side surface of the heat conduction piece, and the T-shaped limiting groove is located between the two grooves; the moving assembly is provided with a T-shaped limiting rod matched with the T-shaped limiting groove, and a driving wheel and a driven wheel matched with the two grooves respectively. When the thin plate is positioned and locked, the moving assembly is installed, finally the moving assembly drives the welding gun to move from one end of the thin plate to be welded to the other end, and automatic welding is completed. Compared with manual welding, the weld is regular, and the weld quality consistency is better.

[0010] The semi-automatic welding machine for the thin plate and the cylindrical piece in the application has the beneficial effects that: 1. The to-be-welded edge of the thin plate is pressed to the outer surface of the cylindrical piece through the clamp, and the clamp can be adaptively adjusted according to the axial length of the cylindrical piece, so that the cylindrical pieces of different lengths and the thin plate welding edges of different lengths can be applied, which solves the problem that the thin plate cannot be close to the cylindrical piece and the technical difficulty that a single welding machine cannot be applied to cylindrical pieces and thin plates of multiple sizes.

[0011] 2. The clamp solves the technical difficulty that the to-be-welded edge cannot be fitted, and then the moving assembly drives the welding gun to complete automatic continuous welding along the to-be-welded edge, which greatly reduces the probability of welding quality problems such as welding pores and cracks, the weld is uniform, the welding time is short, and the efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments described in the application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0013] Figure 1 It is a structural schematic view of the semi-automatic welding machine for the thin plate and the cylindrical piece in the application. Figure 2 It is a sectional view of A-A in the application. Figure 1 Figure 3 It is a right view of the application. Figure 1 Figure 4 It is a perspective view of the application. Figure 1

[0014] ​​​1, welding torch; 2, clamping arm; 3, cross arm; 4, clamping groove; 5, heat conduction piece; 6, positive pressure piece; 7, pre-tightening screw; 8, locking screw; 9, spring; 10, arc-shaped bottom wall; 11, corrugated top wall; 12, cavity; 13, heat conduction support piece; 14, cooling channel; 15, moving assembly; 16, groove; 17, T-shaped limiting groove; 18, curved shaping strip; 19, sheet; 20, cylinder; 21, driving wheel; 22, driven wheel; 23, T-shaped limiting rod. DETAILED DESCRIPTION

[0015] In view of the deficiencies in the prior art, the present inventors have long studied and practiced a large amount of examples to come up with the technical solution of the present application. The technical solution, its implementation process and principles will be further explained below in combination with the drawings and specific implementation examples in the present application.

[0016] As shown in Figure 4 , the present embodiment provides a semi-automatic welding machine for sheet and cylindrical workpiece, which comprises a welding torch 1, a clamp and a welding machine connected with the welding torch 1, and the welding machine is not shown in the figure. The present embodiment does not limit the type of welding machine, and any welding machine suitable for sheet 19 welding can be used.

[0017] The specific structure of the clamp in the present embodiment is as follows: As shown in Figure 1 and Figure 3 , the clamp is provided with two opposite clamping arms 2 and a cross arm 3, and the two clamping arms 2 are respectively installed at the two ends of the cross arm 3 and the spacing between the two clamping arms 2 is adjustable. A sliding groove is provided on the cross arm 3, and the upper end of the clamping arm 2 is in sliding connection with the sliding groove. The spacing between the two clamping arms 2 can be adjusted adaptively according to the axial length of the cylinder 20, so that the clamp is suitable for cylinders 20 of different lengths, and both speciality and universality are taken into account. Further, each clamping arm 2 is provided with a clamping groove 4 adapted to the end of the cylinder 20, i.e. the two ends of the cylinder 20 are correspondingly clamped in the two clamping grooves 4, and then the two ends of the cylinder 20 are clamped between the two clamping arms 2.

[0018] After the cylinder 20 is fixed by the clamping arm 2, the sheet 19 is fixed, and the fixing method is as follows: The lower end of the lifting assembly is provided with a heat conducting piece 5 and a positive pressure piece 6 in sequence, and the lower surface of the positive pressure piece 6 is a circular arc surface. The heat conducting piece 5 and the positive pressure piece 6 are driven by the lifting assembly to press the sheet 19 against the outer surface of the cylinder 20, and then the welding edge of the sheet 19 is tightly attached to the outer surface of the cylinder 20. Specifically, the lifting assembly includes two pre-tightening screws 7 and three locking screws 8, which are distributed at equal intervals in sequence. The two pre-tightening screws 7 and all the locking screws 8 are connected with the cross arm 3 through threads, and the lower ends of all the locking screws 8 are opposite to the heat conducting piece 5. The two pre-tightening screws 7 are respectively close to the two ends of the cross arm 3, and all the locking screws 8 are located between the two pre-tightening screws 7. Further, a spring 9 is arranged between the lower end of each pre-tightening screw 7 and the heat conducting piece 5. The lower end of each spring 9 is fixedly connected with the heat conducting piece 5, and the upper end is rotatably connected with the corresponding pre-tightening screw 7. The sheet 19 is placed on the outer surface of the cylinder 20. First, the two pre-tightening screws 7 are used to pre-tighten the two edges of the sheet 19, then the position of the sheet 19 is accurately adjusted, and finally the position of the sheet 19 after adjustment is locked by the locking screw 8, so that the position of the sheet 19 is quickly locked, and the positioning workload in the early stage of welding is reduced. Because the diameters of the cylinders 20 are different, the curvatures of the outer surfaces of the cylinders 20 are also different. In order to match the positive pressure piece 6 with most of the cylinders 20, the structure of the positive pressure piece 6 is optimized as follows in the embodiment. As shown in Figure 2 The positive pressure piece 6 includes an arc-shaped bottom wall 10 and a corrugated top wall 11, and a sealed cavity 12 is formed between the arc-shaped bottom wall 10 and the corrugated top wall 11, so that the transverse cross-sectional shape of the positive pressure piece 6 is fan-shaped. The arc-shaped bottom wall 10 and the corrugated top wall 11 of the positive pressure piece 6 can both be deformed, and the elastic modulus of the corrugated top wall 11, the elastic modulus of the arc-shaped bottom wall 10 and the elastic modulus of the sheet 19 decrease in sequence. The purpose of limiting the elastic modulus is that after the sheet 19 is placed on the outer surface of the cylinder 20, the arc-shaped bottom wall 10 first contacts the sheet 19. Because the elastic modulus of the arc-shaped bottom wall 10 is greater than the elastic modulus of the sheet 19, the sheet 19 can be attached to the outer surface of the cylinder 20 by deforming the arc-shaped bottom wall 10, and the deformation amount of the sheet 19 is greater than the deformation amount of the arc-shaped bottom wall 10, so that the universal attachment tool is suitable for cylinders 20 with different diameters. While the arc-shaped bottom wall 10 deforms, the corrugated top wall 11 also deforms by a certain amount. The corrugated top wall 11 deforms in order to adapt to the deformation of the arc-shaped bottom wall 10. The arc-shaped bottom wall 10 deforms in order to attach to the outer surfaces of cylinders 20 with different diameters. The elastic modulus of the corrugated top wall 11 is the largest. The deformation of the corrugated top wall 11 is to adapt to the deformation of the arc-shaped bottom wall 10, and at the same time, the corrugated top wall 11 supports the arc-shaped bottom wall 10, avoiding that the corrugated top wall 11 is too soft, resulting in insufficient support of the arc-shaped bottom wall 10 and the arc-shaped bottom wall 10 cannot completely attach to the outer surface of the cylinder 20.

[0019] The positive pressure piece 6 in the embodiment not only has the function of adhering the positive pressure sheet 19 to the cylinder 20, but also has high heat conduction performance. The positive pressure piece 6 is made of high-heat-conduction material, and the cavity 12 is filled with heat conduction agent, which can be liquid metal, heat conduction grease or the like. In addition, the lower surface of the heat conduction piece 5 penetrates the corrugated top wall 11 and extends into the cavity 12. The lower surface of the heat conduction piece 5 is provided with six heat conduction support pieces 13 extending downward and close to the arc-shaped bottom wall 10. Three of the heat conduction support pieces 13 are located on one side of the cavity 12, and the other three are located on the other side of the cavity 12. The heat conduction support pieces 13 greatly increase the heat conduction area, quickly absorb the heat of the heat conduction agent and transfer it to the heat conduction piece 5. The heat conduction support pieces 13 can be elastically deformed, which supports the arc-shaped bottom wall 10 to some extent, so that the positive pressure effect of the arc-shaped bottom wall 10 on the sheet 19 is better, and the adhesion between the sheet 19 and the cylinder 20 is better.

[0020] In order to avoid the heat generated by welding from causing thermal stress deformation of the sheet 19, the heat conduction piece 5 is provided with three cooling channels 14. The three cooling channels 14 of the heat conduction piece 5 are connected with external cooling equipment. The cooling liquid of the cooling equipment flows through the cooling channels 14, and a large amount of heat generated during welding is taken away by the cooling liquid, thereby effectively preventing the sheet 19 from being deformed due to slow heat dissipation and improving the welding quality.

[0021] As shown in FIGS. Figure 3 and Figure 4 In order to improve the welding quality and avoid uneven welding caused by manual welding, the embodiment further includes a moving assembly 15. The welding gun 1 is installed on the moving assembly 15, and the moving assembly 15 drives the welding gun 1 to move along the welding edge. Specifically, the heat conduction piece 5 is in the shape of a rectangular body, the length direction of the heat conduction piece 5 is parallel to the cross arm 3, the heat conduction piece 5 is provided with a groove 16 and a T-shaped limiting groove 17 extending along the length direction. The groove 16 is provided with two, and the two grooves 16 are located on the upper surface and the side surface of the heat conduction piece 5, respectively. The T-shaped limiting groove 17 is located between the two grooves 16. The moving assembly 15 is provided with a T-shaped limiting rod 23 matched with the T-shaped limiting groove 17, and a driving wheel 21 and a driven wheel 22 matched with the two grooves 16, respectively. During welding, the moving assembly 15 is driven to move by the driving wheel 21, and the assembly drives the welding gun 1 to move from one end of the sheet 19 to be welded to the other end.

[0022] The embodiment further provides a semi-automatic welding method for the sheet 19 and the cylinder 20, as follows: S1, workpiece positioning: S101, adjust the distance between the two clamping arms 2 according to the axial length of the cylinder 20. The length of the cross arm 3 must be greater than the axial length of the cylinder 20. S102, the clamping slots 4 of the two clamping arms 2 correspondingly clamp the two ends of the cylinder 20 (the cylinder 20 is a hollow structure, and the cross-sectional shape of the two ends is circular); S103, the sheet 19 is placed on the outer surface of the cylinder 20 and below the positive pressure part 6, the two sides of the sheet 19 are first pre-tightened by the two pre-tightening screws 7, then the position of the sheet 19 is adjusted, the edges of the sheet 19 are aligned and coincided with the edges of the outer surface of the cylinder 20 to be welded, and finally the three locking screws 8 are screwed down to lock the final position of the sheet 19.

[0023] If misalignment occurs during the above adjustment process, the pre-tightening screw 7 can be lifted (i.e. overcome the spring 9 elastic force) to release one side of the sheet 19, and after re-adjustment, the lifted pre-tightening screw 7 is loosened and re-tightened. If the other side of the sheet 19 is not aligned, the other side is adjusted according to the above method until both sides are aligned. However, the edges of the sheet 19 need to exceed the edges of the positive pressure part 6 to reserve the edges to be welded.

[0024] S2, automatic welding: S201, the T-shaped limiting rod 23 of the moving assembly 15 is inserted into the T-shaped limiting slot 17, the driving wheel 21 and the driven wheel 22 are respectively placed in the two grooves 16, the welding gun 1 is connected with the welding machine, the welding gun 1 is installed at the end of the curved shaping strip 18 on the moving assembly 15, the curved shaping strip 18 is manually adjusted to align the welding gun 1 with the edges to be welded between the sheet 19 and the cylinder 20. The curved shaping strip 18 can be arbitrarily bent and keep the shape after bending. The curved shaping strip 18 can adopt a combined structure of PVC / thin film and metal shaping line. This structure is prior art, and will not be described in detail in this embodiment.

[0025] S202, the rotating speed of the driving wheel 21 is set to be appropriate, the welding machine is turned on, and the welding gun 1 moves along the edges to be welded to complete the welding.

[0026] Compared with manual welding, the automatic welding has regular welds, better consistency of weld quality, greatly reduces the probability of welding quality problems such as welding pores and cracks, uniform welds, short welding time and high efficiency.

[0027] It should be understood that the above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled in the art to which the present application belongs, some simple deductions or substitutions can be made without departing from the concept of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A semi-automatic welding machine for thin plates and cylindrical parts, comprising a welding torch; characterized in that: Includes a clamp, which has two opposing clamping arms, with both ends of the cylinder clamped between the two clamping arms; It includes a lifting assembly connected to the clamp. The lower end of the lifting assembly is provided with a heat-conducting component and a positive pressure component in sequence. The lower surface of the positive pressure component is an arc surface. The lifting assembly drives the heat-conducting component and the positive pressure component to press the thin plate tightly against the outer surface of the cylinder, thereby making the welded edge of the thin plate adhere tightly to the outer surface of the cylinder. It includes a moving component, on which the welding torch is mounted, and the moving component drives the welding torch to move along the welding edge.

2. The semi-automatic welding machine for thin plates and cylindrical parts according to claim 1, characterized in that: The clamp includes a horizontal arm, with two clamping arms respectively mounted at both ends of the horizontal arm, and the distance between the two clamping arms is adjustable.

3. The semi-automatic welding machine for thin plates and cylindrical parts according to claim 2, characterized in that: The lifting assembly includes two pre-tightening screws and at least one locking screw. The two pre-tightening screws and all the locking screws are connected to the cross arm by threads, and the lower end of all the locking screws is directly opposite the heat-conducting component. The two pre-tightening screws are respectively close to both ends of the cross arm, and all the locking screws are located between the two pre-tightening screws.

4. A semi-automatic welding machine for thin plates and cylindrical parts according to claim 3, characterized in that: Each preload screw has a spring between its lower end and the heat-conducting component. The lower end of each spring is fixedly connected to the heat-conducting component, and its upper end is rotatably connected to the corresponding preload screw.

5. A semi-automatic welding machine for thin plates and cylindrical parts according to claim 4, characterized in that: Each clamping arm is equipped with a slot that fits the end of the cylinder.

6. A semi-automatic welding machine for thin plates and cylindrical parts according to claim 5, characterized in that: The heat-conducting component is provided with a cooling channel, and the positive pressure component is fixedly connected to the lower surface of the heat-conducting component.

7. A semi-automatic welding machine for thin plates and cylindrical parts according to claim 6, characterized in that: The positive pressure component includes an arc-shaped bottom wall and a corrugated top wall, forming a cavity between the arc-shaped bottom wall and the corrugated top wall. The elastic modulus of the corrugated top wall, the elastic modulus of the arc-shaped bottom wall, and the elastic modulus of the thin plate decrease sequentially.

8. A semi-automatic welding machine for thin plates and cylindrical parts according to claim 7, characterized in that: The cavity is filled with a thermally conductive agent, and the lower surface of the thermally conductive component penetrates the corrugated top wall and extends into the cavity. The lower surface of the thermally conductive component is provided with a plurality of inclined, downward-extending thermally conductive support plates close to the arc-shaped bottom wall.

9. A semi-automatic welding machine for thin plates and cylindrical parts according to claim 8, characterized in that: The heat-conducting component is rectangular in shape, with its length parallel to the horizontal arm. The heat-conducting component has a groove extending along its length and a T-shaped limiting groove. There are two grooves, located on the upper surface and side surface of the heat-conducting component, respectively, and the T-shaped limiting groove is located between the two grooves. The moving component has a T-shaped limiting rod adapted to the T-shaped limiting groove, as well as a drive wheel and a driven wheel adapted to the two grooves, respectively.

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