A multi-layer metal bellows matching end roll welding tool

Abstract

The present application relates to the technical field of seam welder, and discloses a multi-layer metal bellows matched end seam welding tool.The present application comprises: a machine body internally provided with a driving device and a transformer, an upper welding wheel mechanism and a lower welding wheel mechanism are arranged on the machine body support table, an upper extension guide column capable of axial extension is arranged on the upper welding wheel mechanism, and an upper additional electrode wheel is arranged at one end of the upper extension guide column; a lower extension guide column capable of axial extension is arranged on the lower welding wheel mechanism, and a lower additional electrode wheel is arranged at one end of the lower extension guide column; the tool further comprises a synchronous driving mechanism for driving the upper extension guide column and the lower extension guide column to synchronously extend and retract.The synchronous design of the upper additional electrode wheel and the lower additional electrode wheel is matched with the synchronous driving mechanism to realize the synchronous extension and positioning of the two end electrode wheels, and the seam welding work of the two ends of the metal bellows can be completed at one time, thereby improving the processing efficiency.

Description

Technical Field

[0001] This invention relates to the field of roll welding machine technology, and in particular to a roll welding fixture for mating ends of multilayer metal corrugated pipes. Background Technology

[0002] Currently, the welding of mating ends of multi-layer metal corrugated pipes is generally completed using medium-frequency circumferential welders in the industry. However, existing medium-frequency circumferential welders have significant technical shortcomings in practical applications, making it difficult to meet the demands for efficient and precise production.

[0003] Firstly, the welding method has a "single-end limitation," meaning that welding can only be performed on one end of the metal bellows at a time. After one end is welded, the position of the metal bellows must be readjusted, the welding parameters calibrated, and the equipment restarted to weld the other end. This process not only prolongs the processing cycle of a single metal bellows but also leads to inconsistencies in the coaxiality and flatness of the weld seams at both ends due to the easy deviation in the positioning reference between the two welding operations. This increases the difficulty of subsequent assembly adjustments and may even affect the sealing performance and structural stability of the bellows.

[0004] Secondly, the entire welding process relies on manual assistance from operators to support the metal corrugated pipe. On the one hand, slight hand tremors and uneven force during manual support directly affect the stability of the metal corrugated pipe during welding, leading to defects such as undercut and porosity in the weld, thus reducing welding quality. On the other hand, each person can only operate one machine at a time and must continuously focus on supporting the metal corrugated pipe and monitoring the welding status, which significantly limits the number of metal corrugated pipes processed per unit time, making it difficult for production efficiency to meet the needs of large-scale and batch production.

[0005] Furthermore, in manual welding operations, operators must be close to the welding area. The high-temperature radiation, arc light, and metal spatter generated during welding pose direct safety threats to the operators' hands and eyes, resulting in occupational health hazards. Simultaneously, prolonged periods of highly focused operation increase operator fatigue, further raising the risk of operational errors and labor management costs. In summary, existing multi-layer metal corrugated pipe welding methods have significant shortcomings in production efficiency, welding precision, operational safety, and automation, becoming a key bottleneck restricting industry capacity improvement and quality control.

[0006] Therefore, developing a multi-layer metal corrugated pipe end-to-end roll welding fixture that can achieve simultaneous welding of both ends of the metal corrugated pipe without manual assistance is of great significance for breaking through the limitations of existing technology and promoting the upgrading of industry production. It is also a technical need that urgently needs to be addressed. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention provides a multi-layer metal corrugated pipe mating end roll welding fixture.

[0008] The present invention is achieved by the following technical solution: a machine body with a drive device and a transformer inside, an upper welding wheel mechanism and a lower welding wheel mechanism are provided on the machine body support platform, an upper extension guide post that can be axially extended and retracted is provided on the upper welding wheel mechanism, and an upper auxiliary electrode wheel is provided at one end of the upper extension guide post.

[0009] The lower welding wheel mechanism is equipped with a lower extension guide post that can extend and retract axially, and a lower auxiliary electrode wheel is provided at one end of the lower extension guide post;

[0010] The tooling also includes a synchronous drive mechanism for driving the upper and lower extension guide posts to extend and retract synchronously.

[0011] Preferably, the upper welding wheel mechanism includes an upper electrode seat and a hydraulic cylinder for driving the upper electrode seat to rise and fall. An upper guide post is rotatably arranged inside the upper electrode seat, and an upper electrode wheel is provided at one end of the upper guide post. The upper extension guide post slides axially through the upper guide post via a spline.

[0012] Preferably, the upper welding wheel mechanism includes an upper electrode seat and a hydraulic cylinder for driving the upper electrode seat to rise and fall. An upper guide post is rotatably arranged inside the upper electrode seat, and an upper electrode wheel is provided at one end of the upper guide post. The upper extension guide post slides axially through the upper guide post via a spline.

[0013] Preferably, the synchronous drive mechanism includes a linear guide rail mounted on the machine body support platform, a bushing fixedly connected to the slide of the linear guide rail, a bearing fixedly mounted on the upper extension guide post, and a telescopic rod with its two ends fixedly connected to the bearing and the bushing respectively. The bushing is axially slidably mounted on the lower guide tube and fixedly connected to the lower extension guide post, thereby synchronously driving the upper extension guide post and the lower extension guide post to extend and retract through the linear guide rail.

[0014] Preferably, the bushing includes a slip ring that is slidably fitted onto the lower guide tube via a spline. The slip ring and the lower extension guide post are fixedly mounted with the same connector that is slidably connected to the lower guide tube. A rotating ring that is rotatably fitted onto the slip ring is fixedly connected to the telescopic rod and the linear guide slide.

[0015] Preferably, the lower conduit has an elongated sliding opening extending along its axial direction on its wall, and the connector passes through the sliding opening and slides in contact with it.

[0016] Preferably, the lower guide tube is threaded with a front abutment ring for axially limiting the metal bellows; an external threaded tube is fixedly installed on one side of the lower auxiliary electrode wheel, and a rear abutment ring is threaded on the external threaded tube, so as to adjust the axial position of the metal bellows and facilitate precise control of the welding point.

[0017] Preferably, a hinge joint is rotatably provided on one side of the upper auxiliary electrode wheel, and an adjustable clamping mechanism is hinged to the hinge joint to enhance the clamping force of the auxiliary electrode wheel on the metal bellows.

[0018] Preferably, the adjustable clamping mechanism includes a sleeve hinged to the hinge joint, an internally threaded tube rotatably installed inside the sleeve, a threaded rod installed in the internal thread of the internally threaded tube, a roller fixedly installed at the bottom end of the threaded rod, and a limiting rod connected to the roller telescopically provided on the sleeve.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] Existing technologies require welding both ends of the metal bellows in two separate processes, resulting in long processing cycles and low efficiency. This fixture, through the synchronous design of the upper and lower auxiliary electrode wheels, coupled with a synchronous drive mechanism (linear guide rails, bushings, telescopic rods, etc.), achieves synchronous extension and positioning of the electrode wheels at both ends, enabling the roll welding of both ends of the metal bellows in a single operation. This not only eliminates the repetitive steps of "adjusting position and calibrating parameters after each welding" in traditional processes, reducing the processing cycle per piece by more than 50%, but also eliminates the need for continuous manual support and monitoring. A single person can operate multiple machines simultaneously, significantly increasing the processing volume per unit time. It perfectly adapts to the needs of large-scale, batch production, effectively breaking through industry capacity bottlenecks.

[0021] Traditional manual support is prone to weld defects due to hand tremors and uneven force application, and the deviation of the positioning reference between two welds can affect coaxiality and flatness. This tooling ensures accuracy through a triple design: First, the axial limiting adjustment of the front and rear abutment rings can accurately fix the position of the metal bellows and ensure precise alignment of the welding points; Second, the adjustable clamping mechanism (sleeve, internal threaded tube, threaded rod, roller) can enhance the pressing force of the auxiliary electrode wheel on the bellows, avoid the weakening of pressing force caused by excessive extension of the guide post, and eliminate defects such as weld undercut and porosity; Third, the synchronous drive mechanism drives the electrode wheels at both ends to move synchronously, ensuring that the positioning reference of the welding at both ends is consistent, greatly improving the coaxiality and flatness of the weld, reducing the difficulty of adjustment in subsequent assembly processes, while ensuring the sealing performance and structural stability of the bellows and reducing the product defect rate.

[0022] In existing technologies, operators must be close to the welding area, facing safety threats from high-temperature radiation, arc light, and metal spatter. Furthermore, prolonged focused operation can lead to fatigue. This fixture eliminates the need for manual assistance throughout the entire process: the metal bellows is automatically positioned and clamped by the cooperation of the front and rear abutment rings and upper and lower electrode wheels. The welding process is completed automatically by the equipment. Operators only need to set parameters beforehand and handle the handling of finished products later, without needing to approach the welding area. This design fundamentally avoids direct harm to the operator's hands and eyes from high temperatures, arc light, and spatter, while reducing fatigue caused by prolonged high concentration, lowering the risk of operational errors and labor management costs, and significantly improving operational safety and work comfort.

[0023] The industry offers various specifications of metal bellows (differences in length and diameter), and traditional equipment requires frequent tooling changes or parameter adjustments, resulting in poor adaptability. This tooling, through its axially extendable guide posts (the upper guide post passes through the upper guide post, and the lower guide post is splined to the lower guide tube) and the adjustability of the synchronous drive mechanism, allows for precise adjustment of the distance between the upper and lower auxiliary electrode wheels and the main electrode wheel via linear guides, easily adapting to metal bellows of different lengths. Simultaneously, the adjustable clamping mechanism can flexibly adjust the clamping force according to the bellows diameter, ensuring stable welding of products of different specifications. This adaptability design reduces the frequency of tooling changes, further improving production efficiency and reducing equipment investment costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the multi-layer metal bellows mating end roll welding fixture of the present invention from a left-hand perspective.

[0025] Figure 2 This is a schematic diagram of the overall structure of the multi-layer metal bellows mating end roll welding fixture of the present invention from the right perspective.

[0026] Figure 3 This is a front view of the upper welding wheel mechanism and the lower welding wheel mechanism of the present invention;

[0027] Figure 4 This is a rear view of the upper welding wheel mechanism and the lower welding wheel mechanism of the present invention;

[0028] Figure 5 This is a partial sectional view of the upper welding wheel mechanism and the lower welding wheel mechanism of the present invention.

[0029] Figure 6 This is a diagram illustrating the welding wheel mechanism and synchronous drive mechanism of the present invention;

[0030] Figure 7 This is a breakdown diagram of the welding wheel mechanism of the present invention;

[0031] Figure 8 This is a cross-sectional view of the welding wheel mechanism of the present invention;

[0032] Figure 9 This is a cross-sectional view of the welding wheel mechanism of the present invention;

[0033] Figure 10 This is a diagram illustrating an adjustable clamping mechanism.

[0034] Explanation of key symbols:

[0035] 1. Machine body; 2. Upper welding wheel mechanism; 201. Hydraulic cylinder; 202. Upper electrode seat; 203. Upper guide post; 204. Upper electrode wheel; 205. Upper extension guide post; 206. Upper auxiliary electrode wheel; 207. Hinge joint; 208. Adjustable clamping mechanism; 2081. Sleeve; 2082. Internally threaded tube; 2083. Threaded rod; 2084. Limiting rod; 209. Roller; 3. Lower welding wheel mechanism; 301. Lower electrode seat; 302. Lower guide tube; 303. Lower electrode wheel; 304. Lower extension guide post; 305. Lower auxiliary electrode wheel; 306. Front abutment ring; 307. Externally threaded tube; 308. Rear abutment ring; 4. Linear guide rail; 5. Bushing; 501. Slip ring; 502. Connector; 503. Rotating ring; 6. Bearing; 7. Telescopic rod. Detailed Implementation

[0036] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0037] Please combine Figures 1 to 10 A multi-layer metal corrugated pipe mating end roll welding fixture includes a machine body 1 with an internal drive device and transformer. An upper welding wheel mechanism 2 and a lower welding wheel mechanism 3 are provided on the support platform of the machine body 1. The upper welding wheel mechanism 2 includes an upper electrode seat 202 and a hydraulic cylinder 201 for driving the upper electrode seat 202 to rise and fall. An upper guide post 203 is rotatably provided inside the upper electrode seat 202. An upper electrode wheel 204 is provided at one end of the upper guide post 203 and connected by bolts. An upper extension guide post 205 is provided inside the upper guide post 203 and axially slidably connected to it by splines. An upper auxiliary electrode wheel 206 is installed at one end of the upper extension guide post 205 by bolts.

[0038] Please combine Figures 5 to 8 The lower welding wheel mechanism 3 includes a lower electrode seat 301 and a lower guide tube 302 rotatably connected to the lower electrode seat 301. One end of the lower guide tube 302 is connected to the drive device inside the machine body 1, and the other end is fixedly installed with a lower electrode wheel 303. A lower extension guide post 304 is provided inside the lower guide tube 302 and is axially slidably connected to it via a spline. A lower auxiliary electrode wheel 305 is installed at one end of the lower extension guide post 304 by bolts. The tooling also includes a synchronous drive mechanism for driving the upper extension guide post 205 and the lower extension guide post 304 to extend and retract synchronously.

[0039] Through the aforementioned technical solution, the synchronous design of the upper auxiliary electrode wheel 206 and the lower auxiliary electrode wheel 305, combined with a synchronous drive mechanism, enables the synchronous extension, retraction, and positioning of the electrode wheels at both ends, allowing for the one-time completion of the roll welding operation at both ends of the metal bellows. This not only eliminates the repetitive steps of "adjusting position and calibrating parameters after each welding" in traditional processes, shortening the processing cycle of a single piece by more than 50%, but also eliminates the need for continuous manual support and monitoring. A single person can operate multiple machines simultaneously, significantly increasing the processing quantity per unit time. This perfectly adapts to the needs of large-scale, batch production, effectively breaking through the industry's capacity bottleneck.

[0040] Please combine Figures 3 to 8 The synchronous drive mechanism includes a linear guide rail 4 fixedly mounted on the support platform of the machine body 1, a bushing 5 fixedly connected to the slide of the linear guide rail 4, a bearing 6 fixedly mounted on the upper extension guide post 205, and a telescopic rod 7 fixedly connected to the bearing 6 and the bushing 5 at both ends respectively. The bushing 5 is axially slidably mounted on the lower guide tube 302 and fixedly connected to the lower extension guide post 304, thereby synchronously driving the upper extension guide post 205 and the lower extension guide post 304 to extend and retract through the linear guide rail 4.

[0041] The bushing 5 includes a slip ring 501 that is slidably fitted onto the lower guide tube 302 via a spline. The slip ring 501 and the lower extension guide post 304 are fixedly mounted with the same connector 502, which is a bolt, thereby tightening the slip ring 501 and the lower extension guide post 304. A rotating ring 503 that is fixedly connected to the telescopic rod 7 and the linear guide rail 4 slide is rotatably fitted onto the slip ring 501. The lower guide tube 302 has an elongated slot extending along its axial direction on its tube wall. The connector 502 passes through the slot and slides in contact with the slot.

[0042] Through the above technical solution, this tooling, with its axially extendable guide posts (upper extension guide post 205 passing through upper guide post 203, lower extension guide post 304 splinedly connected to lower guide tube 302) and the adjustability of the synchronous drive mechanism (linear guide rail 4, bushing 5, telescopic rod 7), allows for precise adjustment of the spacing between the upper auxiliary electrode wheel 206, lower auxiliary electrode wheel 305 and upper electrode wheel 204, lower electrode wheel 303 via the linear guide rail 4, easily adapting to metal bellows of different lengths. Simultaneously, the adjustable clamping mechanism 208 can flexibly adjust the clamping force according to the bellows diameter, ensuring stable welding of products of different specifications. This adaptability design reduces the frequency of tooling changes, further improving production efficiency and reducing equipment investment costs.

[0043] Please combine Figures 3 to 8The lower conduit 302 is threaded with a front abutment ring 306 for axially limiting the metal bellows; an external threaded tube 307 is fixedly installed on one side of the lower auxiliary electrode wheel 305, and a rear abutment ring 308 is threaded on the external threaded tube 307, so as to adjust the axial position of the metal bellows and facilitate precise control of the welding point.

[0044] Through the above technical solution, the axial limiting adjustment of the front abutment ring 306 and the rear abutment ring 308 can accurately fix the position of the metal bellows and ensure precise alignment of the welding points.

[0045] The metal bellows is automatically positioned and clamped through the cooperation of the front abutment ring 306, the rear abutment ring 308, the upper electrode wheel 204, and the lower electrode wheel 303. The welding process is completed automatically by the equipment. Operators only need to set parameters in the early stage and pick up and put away the finished product in the later stage, without having to approach the welding area. This design fundamentally avoids direct harm to the operator's hands and eyes from high temperature, arc light, and spatter, while reducing fatigue caused by prolonged high concentration, lowering the risk of operational errors and labor management costs, and significantly improving operational safety and work comfort.

[0046] Please combine Figure 5 , Figure 9 as well as Figure 10 A hinge joint 207 is rotatably mounted on one side of the upper auxiliary electrode wheel 206. The hinge joint 207 consists of a flange fixedly connected to the upper auxiliary electrode wheel 206 and a hinge rotatably connected to the flange. An adjustable clamping mechanism 208 is hinged to the hinge joint 207. The adjustable clamping mechanism 208 includes a sleeve 2081 hinged to the hinge joint 207. An internally threaded tube 2082 is rotatably mounted inside the sleeve 2081. A threaded rod 2083 is internally threaded onto the internal thread of the internally threaded tube 2082. A roller 209 is fixedly mounted at the bottom end of the threaded rod 2083. The roller 209 consists of a connector and a wheel body. It is fixed to the threaded rod 2083 through the connector. A limiting rod 2084 is telescopically mounted on the sleeve 2081 and fixedly connected to the connector of the roller 209.

[0047] The above technical solution can enhance the pressing force of the auxiliary electrode wheel on the bellows, avoid the weakening of pressing force caused by excessively long extended guide posts, and eliminate defects such as weld undercut and porosity.

[0048] The implementation principle of the multi-layer metal bellows mating end roll welding fixture of this application is as follows:

[0049] When performing roll welding on the mating end of the metal bellows, the linear guide 4 is started, and the linear guide 4 drives the bushing 5, telescopic rod 7 and bearing 6 to move. During this process, the bushing 5 drives the lower extension guide post 304 in the lower guide tube 302 to move axially through the connector 502. At the same time, the bearing 6 also drives the upper extension guide post 205 in the upper guide post 203 to move, thereby adjusting the position of the upper auxiliary electrode wheel 206 and the lower auxiliary electrode wheel 305 so that the distance between them and the upper electrode wheel 204 and the lower electrode wheel 303 can be adapted to the metal bellows to be processed.

[0050] The metal bellows is placed (sleeved) on the lower electrode wheel 303 and the lower auxiliary electrode wheel 305, and the positions of the front abutment ring 306 and the rear abutment ring 308 are adjusted by rotation, so as to axially limit the metal bellows to be processed, thereby precisely controlling the welding point of the metal bellows.

[0051] Then, the hydraulic cylinder 201 is activated to drive the upper welding wheel mechanism 2 to press down, which, together with the lower welding wheel mechanism 3, presses the metal bellows against the metal.

[0052] Adjust the adjustable clamping mechanism 208 so that the roller 209 on it abuts against the top wall of the external threaded tube 307, thereby ensuring that the upper auxiliary electrode wheel 206 and the lower auxiliary electrode wheel 305 can abut against the welding end of the metal bellows, and avoid the upper extension guide post 205 and the lower extension guide post 304 from being too long, which would weaken the pressing force on the metal bellows and thus ensure the welding effect.

[0053] The drive device inside the machine body 1 drives the lower guide tube 302 to rotate, and the lower guide tube 302 drives the lower electrode wheel 303, the lower extension guide post 304 and the lower auxiliary electrode wheel 305 to rotate (during this process, the slip ring 501 and the connecting piece 502 on the bushing 5 rotate synchronously), while the upper welding wheel mechanism 2 cooperates to perform roll welding on the metal bellows.

[0054] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A multi-layer metal corrugated pipe mating end roll welding fixture, comprising a body (1) internally equipped with a drive device and a transformer, wherein an upper welding wheel mechanism (2) and a lower welding wheel mechanism (3) are provided on the support platform of the body (1), characterized in that: The upper welding wheel mechanism (2) is provided with an axially extendable upper extension guide post (205), and an upper auxiliary electrode wheel (206) is provided at one end of the upper extension guide post (205). The upper welding wheel mechanism (2) includes an upper electrode seat (202) and a hydraulic cylinder (201) for driving the upper electrode seat (202) to rise and fall. An upper guide post (203) is rotatably provided inside the upper electrode seat (202). An upper electrode wheel (204) is provided at one end of the upper guide post (203). The upper extension guide post (205) is axially slidably inserted into the upper guide post (203) through a spline. The lower welding wheel mechanism (3) is provided with an axially telescopic lower extension guide post (304), and a lower auxiliary electrode wheel (305) is provided at one end of the lower extension guide post (304). The lower welding wheel mechanism (3) includes a lower electrode seat (301) and a lower guide tube (302) rotatably connected to the lower electrode seat (301). One end of the lower guide tube (302) is connected to the drive equipment in the machine body (1) and the other end is fixedly installed with a lower electrode wheel (303). One end of the lower extension guide post (304) extends into the lower guide tube (302) and is connected to it through a spline. The tooling also includes a synchronous drive mechanism for driving the upper extension guide post (205) and the lower extension guide post (304) to extend and retract synchronously. The synchronous drive mechanism includes a linear guide rail (4) set on the support platform of the machine body (1), a bushing (5) fixedly connected to the slide of the linear guide rail (4), a bearing (6) fixedly sleeved on the upper extension guide post (205), and a telescopic rod (7) fixedly connected to the bearing (6) and the bushing (5) at both ends respectively. The bushing (5) is axially slidably sleeved on the lower guide tube (302) and fixedly connected to the lower extension guide post (304), thereby driving the upper extension guide post (205) and the lower extension guide post (304) to extend and retract synchronously through the linear guide rail (4). The bushing (5) includes a slip ring (501) that is slidably sleeved on the lower guide tube (302) via a spline. The slip ring (501) and the lower extension guide post (304) are fixedly mounted with the same connector (502) that is slidably connected to the lower guide tube (302). The slip ring (501) is rotatably sleeved with a rotating ring (503) that is fixedly connected to the telescopic rod (7) and the linear guide rail (4) slide. The lower conduit (302) has an elongated sliding opening extending along its axial direction on its wall, and the connector (502) passes through the sliding opening and slides in contact with it.

2. The multi-layer metal corrugated pipe mating end roll welding fixture as described in claim 1, characterized in that, The lower conduit (302) is threaded with a front abutment ring (306) for axially limiting the metal bellows; an external threaded pipe (307) is fixedly installed on one side of the lower auxiliary electrode wheel (305), and a rear abutment ring (308) is threaded on the external threaded pipe (307), so as to adjust the axial position of the metal bellows and facilitate precise control of the welding point.

3. The multi-layer metal corrugated pipe mating end roll welding fixture as described in claim 1, characterized in that, A hinge joint (207) is rotatably provided on one side of the upper auxiliary electrode wheel (206), and an adjustable clamping mechanism (208) is hinged on the hinge joint (207) to enhance the clamping force of the auxiliary electrode wheel on the metal bellows.

4. The multi-layer metal corrugated pipe mating end roll welding fixture as described in claim 3, characterized in that, The adjustable clamping mechanism (208) includes a sleeve (2081) hinged to the hinge joint (207), an internally threaded tube (2082) is rotatably installed inside the sleeve (2081), a threaded rod (2083) is installed on the internal thread of the internally threaded tube (2082), a roller (209) is fixedly installed at the bottom end of the threaded rod (2083), and a limiting rod (2084) connected to the roller (209) is telescopically provided on the sleeve (2081).

Images