Inner welding equipment for barrel-shaped parts

Abstract

The utility model relates to a barrel-shaped part internal welding device which comprises a machine frame with a working table and further comprises a placing platform, a welding platform, a welding platform and a welding platform, the positioning assembly comprises a first positioning piece and a second positioning piece; the first pressing mechanism is located in the barrel-shaped part in the working state and used for pressing the first side edge of the weld joint from top to bottom. The second pressing mechanism comprises a transversely-arranged pressing strip, and the pressing strip is located in the barrel-shaped part in the working state and presses the second side edge of the welding seam from top to bottom; the third pressing mechanism is located outside the barrel-shaped part in the working state and used for pressing the first side edge and the second side edge of the weld joint from outside to inside; and the welding device is arranged on the placing platform and is positioned in the barrel-shaped part in a working state. The welding tool is easy and convenient to operate, accurate positioning of the first side edge and the second side edge of the welding seam can be guaranteed, the welding seam is effectively prevented from being too large, flatness of the welding seam is guaranteed, and therefore the welding effect and the precision degree are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to an internal welding device for barrel-shaped parts. Background Art

[0002] At present, the inner drum of a small steam oven is generally welded by external welding due to its compact structure. For example, the Chinese invention patent with patent number ZL 201910355176.1 (authorization announcement number CN111839188A) discloses a steam box drum positioning tool, which includes a lower positioning structure and an upper positioning structure, the lower positioning structure includes a positioning support bar and a corner positioning block, and the upper positioning structure includes a long side positioning component, a short side positioning component and a corner positioning component. For example, the Chinese utility model patent with patent number ZL 202320075854.0 (authorization announcement number CN 219542049 U) discloses a clamping mechanism, including a workbench; an internal support mechanism; four support bars; each support bar is provided with a presser foot for pressing the corresponding side edges of the first flange and the second flange; there are at least two presser feet on each support bar, and they are arranged at intervals along the length direction of the corresponding support bar, and at least a portion of the bottom surface of each presser foot can enclose a pressing surface with the same shape as the second flange.

[0003] However, the use of external welding will make the device inconvenient to operate and difficult to clamp, or the clamping strips will be too long, resulting in too large clamping joints, which may cause welding failures and welds that are too large, affecting the welding effect. On the other hand, cooling is required on the inside, which may cause burrs and excessive welding slag on the inner wall, affecting the refinement and appearance. Due to the increased requirements for the vertical barrel structure and refinement, the clamping and welding methods of external welding cannot meet the requirements. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a barrel-shaped parts internal welding device with accurate and reliable positioning and good welding effect in view of the prior art.

[0005] The utility model solves the above technical problems by adopting the following technical solution: a barrel-shaped parts internal welding device, comprising a frame, the top of which is a workbench, the weld of the barrel-shaped parts extending along its axial direction, one side of the weld being its first side and the other side being its second side, characterized in that it also comprises:

[0006] A placing platform is arranged on the table top of the above-mentioned workbench and is used for the barrel-shaped parts to be placed horizontally;

[0007] A positioning assembly, arranged on the workbench, comprising a first positioning member for positioning an end edge of each side edge of the weld and a second positioning member for positioning an edge of the first side edge;

[0008] The first pressing mechanism is arranged on the tabletop of the above-mentioned workbench, located inside the barrel-shaped part in the working state, and is used to press the first side of the above-mentioned weld from top to bottom;

[0009] The second pressing mechanism is arranged on the tabletop of the above-mentioned workbench, including a horizontally arranged pressing strip. In the working state, the pressing strip is located inside the barrel-shaped part and presses the second side of the above-mentioned weld from top to bottom;

[0010] The third pressing mechanism is arranged on the tabletop of the above-mentioned workbench, located outside the barrel-shaped part in the working state, and is used to press the first side and the second side of the weld from outside to inside; and

[0011] The welding device is arranged above the tabletop of the above-mentioned placement platform and is located inside the barrel-shaped part in the working state.

[0012] Furthermore, a first cylinder is vertically arranged on the workbench. The piston rod of the first cylinder is linked with the first end of the above-mentioned pressing strip, and a downward pressing mechanism for pressing the other end of the pressing strip is also arranged on the workbench. In this way, the second side of the weld is pressed by driving the pressing strip to move up and down through the first cylinder, and the downward pressing mechanism can ensure the uniform distribution of the downward pressure applied by the pressing strip on the second side, so as to ensure that the pressing strip presses the second side more reliably.

[0013] Furthermore, the downward pressing mechanism includes a vertically arranged downward pressing block and a second cylinder for driving the downward pressing block to move up and down. Among them, the upper end of the downward pressing block is bent and located above the second end of the above-mentioned pressing strip. In this way, when the downward pressing block moves downward under the drive of the second cylinder, it can press the second end of the pressing strip from top to bottom.

[0014] Furthermore, a third cylinder and a moving platform are horizontally arranged under the workbench. The piston rod of the third cylinder is fixed to one side of the moving platform and can push the moving platform to move horizontally back and forth along the spacing direction of the above-mentioned weld. The second cylinder is installed on the moving platform, and the piston rod of the second cylinder is fixed to the above-mentioned downward pressing block. The stable installation of the second cylinder can be realized through the moving platform, and the translation of the downward pressing block relative to the pressing strip can be realized by driving the moving platform to translate back and forth through the third cylinder, which is convenient for the operator to load or unload the barrel-shaped part.

[0015] Furthermore, the first cylinder is installed on the bottom surface of the workbench, and a support frame is fixed on the tabletop of the workbench above the first cylinder. The support frame has a horizontally extending top wall. The first end of the above-mentioned pressing strip is fixed on the top wall, and the piston rod of the first cylinder passes through the workbench and is fixed to the top wall of the support frame. On the one hand, it is beneficial to realize the stable installation of the pressing strip, and on the other hand, it can make the first cylinder drive the pressing strip to lift smoothly.

[0016] Furthermore, the first pressing mechanism includes a fourth cylinder and a first pressing block. Among them, there are at least two fourth cylinders arranged side by side along the length direction of the first side edge, and each fourth cylinder is arranged vertically and obliquely downward toward the weld direction from top to bottom. And the above-mentioned first pressing blocks are at least two and correspond to the above-mentioned fourth cylinders one by one, and each first pressing block is respectively fixed on the piston rod of the corresponding fourth cylinder. In this way, by driving the corresponding first pressing block by each fourth cylinder, the pressing of the first side edge can be realized.

[0017] Furthermore, a vertically extending mounting seat is fixed on the tabletop of the workbench. One side of the upper end of the mounting seat is provided with a horizontally extending cantilever, and the cantilever is located above the above-mentioned placing platform. And each of the above-mentioned fourth cylinders is arranged along the length direction of the cantilever, and, in the working state, the cantilever is located inside the above-mentioned barrel-shaped part. Thereby, the stable installation of each fourth cylinder can be realized, and the first pressing block on each fourth cylinder can better press the first side edge.

[0018] Furthermore, the first positioning member is a block arranged on the placing platform, and this block can abut against the end edge of one end of each side of the weld. The above-mentioned second positioning member is a rod arranged vertically and can abut against the edge of the first side edge. This rod is arranged on the above-mentioned placing platform and can be lifted up and down under the drive of a fifth cylinder to be exposed above the tabletop of the placing platform or hidden in the placing platform. In this way, first, the first side edge is positioned by the first positioning member and the second positioning member, then the second positioning member is withdrawn by the fifth cylinder, the first pressing mechanism presses the first side edge, and then the second side edge is manually attached to the first side edge, and the second side edge is positioned by the first side edge and the first positioning member.

[0019] Furthermore, the outer side surface of the lower end of the pressing strip matches the corner shape of the barrel-shaped part on the side of the second side edge. The above-mentioned third pressing mechanism includes a second pressing block and a sixth cylinder. Among them, the sixth cylinder is installed on the tabletop of the workbench, and a pushing block is fixed on the piston rod of the sixth cylinder. The size of the pushing block matches the above-mentioned second pressing block, and, the second pressing block is arranged at an interval from the lower end of the above-mentioned pressing strip. The end face shape of the free end of the second pressing block matches the corner shape of the barrel-shaped part on the side of the second side edge. In the working state, the corresponding part of the barrel-shaped part on the side of the second side edge is clamped between the lower end of the pressing strip and the above-mentioned second pressing block, and the above-mentioned sixth cylinder can push the second pressing block toward the lower end of the pressing strip through the pushing block on it. In this way, by the sixth cylinder pushing the second pressing block, the corresponding part of the barrel-shaped part is pressed by the second pressing block and the pressing strip, ensuring the fitting and flatness of the first side edge and the second side edge.

[0020] Furthermore, a through hole is formed in the placement platform. A screw sleeve is vertically installed in the through hole. A screw rod is vertically inserted into the screw sleeve and forms a screw transmission pair with the screw sleeve. The upper end of the screw rod is pivotally connected to the placement platform. Thus, the lifting of the placement platform can be realized, which is convenient for placing the barrel-shaped parts on the tabletop of the placement platform or for removing the welded barrel-shaped parts from the placement platform.

[0021] Compared with the prior art, the advantages of the present utility model are as follows: The internal welding device for barrel-shaped parts of the present utility model includes a placement platform, a positioning assembly, a first pressing mechanism, a second pressing mechanism, a third pressing mechanism, and a welding device, etc.

[0022] During operation, first, the first side of the weld seam is positioned by the positioning assembly. Then, the first side is pressed from top to bottom by the first pressing mechanism. Next, the second side of the weld seam is manually attached to the first side, and the second side is positioned by the first side and the first positioning member of the positioning assembly. Then, the second side is pressed from top to bottom by the second pressing mechanism. Then, the first side and the second side are pressed by the third pressing mechanism to ensure that the edges of the two sides are completely attached. Finally, the welding device is turned on to complete the internal welding operation.

[0023] As can be seen from the above, the operation of the present utility model is simple, which can ensure the accurate positioning of the first side and the second side of the weld seam, effectively avoid the excessive weld seam, ensure the flatness of the weld seam, and thus ensure the welding effect and delicacy. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the internal welding device for barrel-shaped parts in the working state in the embodiment of the present utility model;

[0025] Figure 2 is Figure 1 a schematic structural diagram in another direction;

[0026] Figure 3 is Figure 1 a schematic structural diagram in yet another direction;

[0027] Figure 4 is a sectional view of the internal welding device for barrel-shaped parts in the working state in the embodiment of the present utility model;

[0028] Figure 5 is Figure 4 an enlarged view of part A in

[0029] Figure 6 is a schematic partial structural diagram of the internal welding device for barrel-shaped parts in the embodiment of the present utility model;

[0030] Figure 7 is Figure 6 a schematic structural diagram in another direction;

[0031] Figure 8 is Figure 6 an enlarged view of part B in

[0032] Figure 9 is Figure 7 an enlarged view of part C in Specific embodiments

[0033] The present utility model will be further described in detail below in conjunction with the embodiments with reference to the drawings.

[0034] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the disclosed embodiments of the present utility model can be arranged in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to the directions opposite to or consistent with the direction of gravity. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0035] As Figures 1 to 9 shown, an internal welding device for a barrel-shaped part includes a frame 1. The top of the frame 1 is a workbench 10. The weld 20 of the barrel-shaped part 2 extends along its axial direction. One side of the weld 20 is its first side 201 and the other side is the second side 202.

[0036] Further, it further includes a placement platform 3, a positioning assembly 4, a first pressing mechanism 5, a second pressing mechanism 6, a third pressing mechanism 7, and a welding device 8. Specifically, the placement platform 3 is disposed on the tabletop 100 of the above-mentioned workbench 10 and is for the barrel-shaped part 2 to be placed horizontally. The positioning assembly 4 is disposed on the above-mentioned workbench 10 and includes a first positioning member 41 for positioning one end edge of each side of the weld seam 20 and a second positioning member 42 for positioning the edge of the first side 201. The first pressing mechanism 5 is disposed on the tabletop 100 of the above-mentioned workbench 10 and is located inside the barrel-shaped part 2 in the working state and is for pressing the first side 201 of the above-mentioned weld seam 20 from top to bottom. The second pressing mechanism 6 is disposed on the tabletop 100 of the above-mentioned workbench 10 and includes a horizontally arranged pressing strip 62. In the working state, the pressing strip 62 is located inside the barrel-shaped part 2 and presses the second side 202 of the above-mentioned weld seam 20 from top to bottom. The third pressing mechanism 7 is disposed on the tabletop 100 of the above-mentioned workbench 10 and is located outside the barrel-shaped part 2 in the working state and is for pressing the first side 201 and the second side 202 of the weld seam 20 from outside to inside. The welding device 8 is disposed on the tabletop of the above-mentioned placement platform 3 and is located inside the barrel-shaped part 2 in the working state.

[0037] As can be seen from the above, the internal welding device for the barrel-shaped part of the present utility model includes a placement platform 3, a positioning assembly 4, a first pressing mechanism 5, a second pressing mechanism 6, a third pressing mechanism 7, a welding device 8, etc. During operation, first, the positioning of the first side 201 of the weld seam 20 is achieved through the positioning assembly 4. Then, the first side 201 is pressed from top to bottom by the first pressing mechanism 5. Then, the second side 202 of the weld seam 20 is manually attached to the first side 201, and the second side 202 is positioned through the first side 201 and the first positioning member 41 of the positioning assembly 4. Then, the second side 202 is pressed from top to bottom by the second pressing mechanism 6. Then, the first side 201 and the second side 202 are pressed by the third pressing mechanism 7 to ensure that the edges of the two are completely attached. Finally, the welding device 8 is turned on to complete the internal welding operation. It can be seen that the operation of the present utility model is simple, can ensure the accurate positioning of the first side 201 and the second side 202 of the weld seam 20, effectively avoid the weld seam 20 from being too large, ensure the flatness at the weld seam 20, and thus ensure the welding effect and fineness.

[0038] Further, a first air cylinder 61 is vertically arranged on the workbench 10. The piston rod of the first air cylinder 61 is linked to the first end of the pressing strip 62, and a pressing mechanism 9 for pressing the other end of the pressing strip 62 is also arranged on the workbench 10. In this way, the second side 202 of the weld seam 20 is pressed tightly by driving the pressing strip 62 to move up and down through the first air cylinder 61, and the pressing mechanism 9 can ensure the uniform distribution of the downward pressure applied by the pressing strip 62 to the second side 202, so as to ensure that the pressing strip 62 presses the second side 202 more reliably. In this embodiment, the pressing mechanism 9 includes a vertically arranged pressing block 91 and a second air cylinder 92 for driving the pressing block 91 to move up and down. Among them, the upper end of the pressing block 91 is bent and located above the second end of the pressing strip 62. In this way, when the pressing block 91 moves downward under the drive of the second air cylinder 92, it can press the second end of the pressing strip 62 from top to bottom.

[0039] Furthermore, a third air cylinder 93 and a moving platform 94 are horizontally arranged under the workbench 10 respectively. Among them, the piston rod of the third air cylinder 93 is fixed to one side of the moving platform 94 and can push the moving platform 94 to move horizontally back and forth along the spacing direction of the weld seam 20, and the second air cylinder 92 is installed on the moving platform 94, and the piston rod of the second air cylinder 92 is fixed to the pressing block 91. The stable installation of the second air cylinder 92 can be realized through the moving platform 94, and the translation of the pressing block 91 relative to the pressing strip 62 can be realized by driving the moving platform 94 to translate back and forth through the third air cylinder 93, which is convenient for the operator to load or unload the barrel-shaped part 2.

[0040] Further, the first air cylinder 61 is installed on the bottom surface of the workbench 10, and a support frame 63 is fixed on the tabletop 100 of the workbench 10 above the first air cylinder 61. The support frame 63 has a horizontally extending top wall. The first end of the pressing strip 62 is fixed on the top wall, and the piston rod of the first air cylinder 61 passes through the workbench 10 and is fixed to the top wall of the support frame 63. On the one hand, it is beneficial to realize the stable installation of the pressing strip 62, and on the other hand, the first air cylinder 61 can drive the pressing strip 62 to move up and down smoothly.

[0041] Furthermore, the above-mentioned first pressing mechanism 5 includes a fourth cylinder 51 and a first pressing block 52. Among them, there are at least two fourth cylinders 51 arranged side by side along the length direction of the first side 201, and each fourth cylinder 51 is arranged vertically and obliquely downward toward the weld 20 from top to bottom. And the above-mentioned first pressing blocks 52 are at least two and correspond to the above-mentioned fourth cylinders 51 one by one, and each first pressing block 52 is respectively fixed on the piston rod of the corresponding fourth cylinder 51. In this way, the first side 201 can be pressed by driving the corresponding first pressing block 52 through each fourth cylinder 51. Preferably, a vertically extending mounting seat 53 is fixed on the tabletop 100 of the above-mentioned workbench 10. One side of the upper end of the mounting seat 53 is provided with a horizontally extending cantilever 54. The cantilever 54 is located above the above-mentioned placing platform 3, and each of the above-mentioned fourth cylinders 51 is arranged along the length direction of the cantilever 54. And, in the working state, the cantilever 54 is located inside the above-mentioned barrel-shaped part 2. Thus, the stable installation of each fourth cylinder 51 can be realized, and the first pressing block 52 on each fourth cylinder 51 can better press the first side 201.

[0042] In this embodiment, specifically, the above-mentioned first positioning member 41 is a block arranged on the placing platform 3, and this block can abut against the end edges of one ends of the sides of the weld 20. The above-mentioned second positioning member 42 is a rod arranged vertically and can abut against the edge of the first side 201. This rod penetrates through the above-mentioned placing platform 3 and can be lifted up and down under the drive of the fifth cylinder 43 to be exposed above the tabletop of the placing platform 3 or hidden in the placing platform 3. In this way, first, the first side 201 is positioned by the first positioning member 41 and the second positioning member 42. Then, the second positioning member 42 is withdrawn by the fifth cylinder 43 (that is, the second positioning member 42 is driven to descend), the first pressing mechanism 5 presses the first side 201, and then the second side 202 is manually attached to the first side 201, and the second side 202 is positioned by the first side 201 and the first positioning member 41.

[0043] Further, the outer side surface of the lower end of the pressing strip 62 matches the corner shape of the barrel-shaped part 2 on the second side 202 side. The third pressing mechanism 7 includes a second pressing block 71 and a sixth cylinder 72. Among them, the sixth cylinder 72 is installed on the tabletop 100 of the workbench 10, and a pushing block 73 is fixed on the piston rod of the sixth cylinder 72. The size of the pushing block 73 matches that of the second pressing block 71. Moreover, the second pressing block 71 is arranged at an interval from the lower end of the pressing strip 62, and the end face shape of the free end of the second pressing block 71 matches the corner shape of the barrel-shaped part 2 on the second side 202 side. In the working state, the corner corresponding to the second side 202 side of the barrel-shaped part 2 is clamped between the lower end of the pressing strip 62 and the second pressing block 71, and the sixth cylinder 72 can push the second pressing block 71 towards the lower end of the pressing strip 62 through the pushing block 73 thereon. In this way, by pushing the second pressing block 71 with the sixth cylinder 72, the corresponding part of the barrel-shaped part 2 is pressed by the second pressing block 71 and the pressing strip 62, ensuring the fitting and flatness of the first side 201 and the second side 202.

[0044] In this embodiment, a through hole is formed in the placing platform 3, and a screw sleeve 32 is vertically embedded in the through hole. A screw rod 31 is vertically inserted into the screw sleeve 32 and forms a screw transmission pair with the screw sleeve 32. The upper end of the screw rod 31 is pivotally connected to the placing platform 3. Thus, the lifting of the placing platform 3 can be realized, facilitating the placement of the barrel-shaped part 2 on the tabletop of the placing platform 3 or facilitating the removal of the welded barrel-shaped part 2 from the placing platform 3. Preferably, to facilitate the rotation of the screw rod 31, a handwheel 35 is installed at the lower end of the screw rod 31. At the same time, to make the placing platform 3 more stably arranged on the tabletop 100 of the workbench 10 and smoothly lift up and down, the placing platform 3 is square. The screw rod 31 is connected to the center of the bottom surface of the placing platform 3, and four guide rods 33 are evenly spaced on the bottom surface of the placing platform 3. Each guide rod 33 is vertically inserted into a guide sleeve 34 installed on the placing platform 3 and forms a screw transmission pair with the corresponding guide sleeve 34 respectively. The upper ends of the guide rods 33 are respectively pivotally connected to the placing platform 3.

Claims

1. A barrel-shaped part internal welding device, comprising a frame (1), the top of the frame (1) being a workbench (10), the weld (20) of the above barrel-shaped part (2) extending along its axis, one side of the weld (20) being its first side (201) and the other side being the second side (202), characterized in that, Further included are: A placement platform (3) which is arranged above the tabletop (100) of the above-mentioned workbench (10) and for the horizontal placement of the barrel-shaped part (2); A positioning assembly (4) which is arranged on the above-mentioned workbench (10) and includes a first positioning member (41) for positioning one end edge of each side of the weld seam (20) and a second positioning member (42) for positioning the edge of the first side (201); A first pressing mechanism (5) which is arranged on the tabletop (100) of the above-mentioned workbench (10) and is located inside the barrel-shaped part (2) in the working state and is used to press the first side (201) of the above-mentioned weld seam (20) from top to bottom; A second pressing mechanism (6) which is arranged on the tabletop (100) of the above-mentioned workbench (10) and includes a horizontally arranged pressing strip (62). In the working state, the pressing strip (62) is located inside the barrel-shaped part (2) and is used to press the second side (202) of the above-mentioned weld seam (20) from top to bottom; A third pressing mechanism (7) which is arranged on the tabletop (100) of the above-mentioned workbench (10) and is located outside the barrel-shaped part (2) in the working state and is used to press the first side (201) and the second side (202) of the weld seam (20) from outside to inside; And A welding device (8) which is arranged above the tabletop of the above-mentioned placement platform (3) and is located inside the barrel-shaped part (2) in the working state.

2. The barrel-shaped part internal welding device according to claim 1, characterized in that, A first air cylinder (61) is vertically arranged on the above-mentioned workbench (10). The piston rod of the first air cylinder (61) is linked with the first end of the above-mentioned pressing strip (62), and a downward pressing mechanism (9) for pressing the other end of the pressing strip (62) is also arranged on the above-mentioned workbench (10).

3. The barrel-shaped part internal welding device according to claim 2, characterized in that The downward pressing mechanism (9) includes a vertically arranged downward pressing block (91) and a second air cylinder (92) for driving the upward and downward movement of the downward pressing block (91). Among them, the upper end of the downward pressing block (91) is bent and located above the second end of the above-mentioned pressing strip (62).

4. The barrel-shaped part internal welding device according to claim 3, characterized in that, A third air cylinder (93) and a moving platform (94) are respectively horizontally arranged below the above-mentioned workbench (10). Among them, the piston rod of the third air cylinder (93) is fixed to one side of the moving platform (94) and can push the moving platform (94) to horizontally move back and forth along the spacing direction of the above-mentioned weld seam (20), and the second air cylinder (92) is installed on the moving platform (94), and the piston rod of the second air cylinder (92) is fixed to the above-mentioned downward pressing block (91).

5. The barrel-shaped part internal welding device according to claim 2 or 3 or 4, characterized in that The first air cylinder (61) is installed on the bottom surface of the workbench (10), and a support frame (63) is fixed on the tabletop (100) of the workbench (10) above the first air cylinder (61). The support frame (63) has a horizontally extending top wall. The first end of the above-mentioned pressing strip (62) is fixed on the top wall, and the piston rod of the above-mentioned first air cylinder (61) passes through the above-mentioned workbench (10) and is fixed to the top wall of the above-mentioned support frame (63).

6. The inner welding equipment for barrel-shaped parts according to any one of claims 1 to 4, characterized in that, The first pressing mechanism (5) includes a fourth cylinder (51) and a first pressing block (52). Among them, there are at least two fourth cylinders (51) arranged side by side along the length direction of the first side (201), and each fourth cylinder (51) is arranged vertically and obliquely downward toward the weld (20) from top to bottom. And the above-mentioned first pressing blocks (52) are at least two and correspond to the above-mentioned fourth cylinders (51) one by one, and each first pressing block (52) is respectively fixed on the piston rod of the corresponding fourth cylinder (51).

7. The barrel-shaped part internal welding device according to claim 6, characterized in that, A vertically extending mounting seat (53) is fixed on the tabletop (100) of the workbench (10). One side of the upper end of the mounting seat (53) is provided with a horizontally extending cantilever (54). The cantilever (54) is located above the above-mentioned placing platform (3). And each of the above-mentioned fourth cylinders (51) is arranged along the length direction of the cantilever (54). And, in the working state, the cantilever (54) is located inside the above-mentioned barrel-shaped part (2).

8. The barrel-shaped part internal welding device according to any one of claims 1 to 4, characterized in that The first positioning member (41) is a block arranged on the placing platform (3), and this block can abut against the edge of one end of each side of the weld (20). The above-mentioned second positioning member (42) is a rod arranged vertically and can abut against the edge of the first side (201). This rod is inserted through the above-mentioned placing platform (3) and can be lifted up and down under the drive of the fifth cylinder (43) to be exposed above the tabletop of the placing platform (3) or hidden in the placing platform (3).

9. The inner welding device for barrel-shaped parts according to any one of claims 1 to 4, characterized in that The outer side surface of the lower end of the pressing strip (62) matches the corner shape of the barrel-shaped part (2) on the side of the second side (202). The above-mentioned third pressing mechanism (7) includes a second pressing block (71) and a sixth cylinder (72). Among them, the sixth cylinder (72) is installed on the tabletop (100) of the workbench (10), and a pushing block (73) is fixed on the piston rod of the sixth cylinder (72). The size of the pushing block (73) matches the above-mentioned second pressing block (71). And the second pressing block (71) is arranged at an interval from the lower end of the above-mentioned pressing strip (62). The end face shape of the free end of the second pressing block (71) matches the corner shape of the barrel-shaped part (2) on the side of the second side (202). In the working state, the corner corresponding to the side of the second side (202) of the barrel-shaped part (2) is clamped between the lower end of the pressing strip (62) and the above-mentioned second pressing block (71), and the above-mentioned sixth cylinder (72) can push the second pressing block (71) toward the lower end of the pressing strip (62) through the pushing block (73) thereon.

10. The barrel-shaped part internal welding device according to any one of claims 1 to 4, characterized in that, A through hole is formed in the placing platform (3), and a screw sleeve (32) is vertically installed in the through hole. A screw rod (31) is vertically inserted through the screw sleeve (32) and forms a screw transmission pair with the screw sleeve (32), and the upper end of the screw rod (31) is pivotally connected to the placing platform (3).

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