Auxiliary equipment for welding exhaust manifold

Abstract

The invention relates to the technical field of manifold welding, in particular to auxiliary equipment for exhaust manifold welding, which comprises a base and further comprises a positioning piece, the positioning piece is arranged in the base, a cooling part is arranged in the positioning piece, and when a manifold body and a flange are welded, the positioning piece conveys a cooling medium to a welding position to offset thermal stress generated by welding; the device further comprises a detection piece, the detection piece comprises a frame body arranged on the outer side of the positioning piece, a temperature sensing adjusting part is arranged in the frame body, and the temperature sensing adjusting part dynamically adjusts the flow of a cooling medium conveyed to the welding position by the cooling part by detecting the welding temperature. Dynamic self-adjustment of the cooling intensity is achieved by arranging the detection piece, when the detection piece senses that the local welding temperature rises, the temperature sensing adjusting part can drive the adjusting part to act, the flow of the cooling medium leading to the high-temperature area is increased, accordingly, thermal stress is counteracted in a targeted mode, and the welding deformation or undercut phenomenon caused by overheating is prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of manifold welding, in particular to an auxiliary device for exhaust manifold welding. BACKGROUND

[0002] The exhaust manifold is a key component of the automobile engine system, and its main function is to collect the high-temperature exhaust gas generated by the combustion of each cylinder of the engine, and orderly guide the exhaust gas into the exhaust manifold, and finally transport it to the subsequent processing unit. As the core channel connecting the engine cylinder and the exhaust system, the design and manufacturing quality of the exhaust manifold directly affects the exhaust efficiency, power output stability and tail gas treatment effect of the engine.

[0003] From the structure, the exhaust manifold is usually composed of multiple intake channels, an exhaust main pipe for collecting exhaust gas, and a connecting flange. In order to reduce the mutual interference during the exhaust process of each cylinder, modern exhaust manifolds often adopt a branched design, with an independent manifold for each cylinder or every two cylinders, and the pipe shape is optimized to reduce air resistance.

[0004] In the manufacturing and assembly process of the exhaust manifold, welding is a key process for connecting the manifold body and the flange. However, during the welding process, defects are easily caused due to improper process control.

[0005] A Chinese patent with application number CN202411146910.0 discloses an automobile processing welding tool, which includes a tool base and a welding device mounted thereon. The workpiece to be processed by the welding device includes a bivalve catalytic converter, an exhaust manifold, and an exhaust pipe tail pipe. The welding device includes a welding head, which is used for annular welding of the ports of the exhaust manifold, the exhaust pipe tail pipe, and the bivalve catalytic converter. The present application can detect the flatness and size of both ends of the bivalve catalytic converter, so that the welding surface between the connection end of the bivalve catalytic converter and the exhaust manifold and the exhaust pipe tail pipe remains tight. At the same time, the exhaust manifold connecting assembly and the exhaust pipe tail pipe connecting assembly make the exhaust pipe assembly in a tension state, which can partially offset the thermal stress generated by welding, reduce stress concentration phenomenon, improve the fatigue life of the exhaust pipe assembly, and avoid leakage problems at the welding position under actual working conditions.

[0006] Although the above document offsets the thermal stress generated by welding by making the exhaust pipe assembly in a tension state to reduce stress concentration phenomenon, there are still some technical problems that need to be solved in actual application. Specifically: When the exhaust manifold and the flange are welded and the cooling rate is too fast, the molten pool metal solidifies rapidly, the solubility of gas in the solid metal is much lower than that in the liquid, and the gas is wrapped in the weld before it is precipitated, forming spherical or worm-shaped pores; the pores not only reduce the effective cross-sectional area of the weld, reduce the strength and density of the joint, but also may become a stress concentration point, inducing crack propagation, especially for the exhaust manifold working in high temperature and high pressure environment, the pores will significantly weaken its durability, and even cause exhaust leakage.

[0007] In the welding of the exhaust manifold and the flange, if the wire feeding speed is too low, the arc locally heats for a long time, not only will the base material be burned and form an undercut defect, but also the welding deformation will be aggravated due to excessive heat input; the undercut directly reduces the effective load-bearing area of the base material, causes stress concentration, and significantly reduces the fatigue strength of the weld, which may become the origin of fatigue cracks when the exhaust manifold bears thermal cycle load. SUMMARY

[0008] The purpose of the present application is to provide an auxiliary device for welding an exhaust manifold, which aims to solve the problems raised in the background art.

[0009] To achieve the above-mentioned purpose, the present application provides the following technical solutions: The present application provides an auxiliary device for welding an exhaust manifold, comprising a base, further comprising: A positioning member is arranged inside the base and used for positioning the manifold body and the flange; A cooling part is arranged in an array inside the positioning member, which transports cooling medium to the welding position when the manifold body and the flange are welded, so as to offset the thermal stress generated by welding; A detection member comprises a frame arranged outside the positioning member, and a temperature sensing and adjusting part is arranged inside the frame, which dynamically adjusts the flow of cooling medium transported by the cooling part to the welding position by detecting the welding temperature; A partition member is arranged outside the positioning member, which limits the cooling area corresponding to the cooling part when the flow of cooling medium transported by the cooling part to the welding position increases.

[0010] Preferably, the temperature sensing and adjusting part comprises: An elastic member is arranged at the bottom of the frame, and the elastic member is connected with the frame; An adjusting part is arranged below the frame and connected with the elastic member through a connecting rod, which adjusts the flow of medium into the cooling part according to the extension and contraction amount of the elastic member.

[0011] Preferably, the cooling part comprises a main gas channel arranged in an array inside the positioning member, and a branch gas channel is arranged in an array on the main gas channel.

[0012] Preferably, the air outlet of the branch air channel is directed towards the top of the positioning member, and the diameter of the branch air channel is smaller than that of the main air channel.

[0013] Preferably, the partition member comprises: a movable cavity symmetrically arranged outside the main air channel, and a movable block arranged inside the movable cavity, wherein, when the movable block is in an extended state, the end of the movable block away from the movable cavity is in contact with the inner ring of the manifold body; a driving part symmetrically arranged inside the main air channel, and configured to drive the movable block in the movable cavity to be in the extended state when the flow of the cooling medium flowing into the main air channel increases.

[0014] Preferably, the partition member further comprises a channel, one end of the channel being in communication with the main air channel, and the other end of the channel being in communication with the movable cavity.

[0015] Preferably, the adjusting part comprises a moving block, and a through hole with a gradually increasing diameter from bottom to top is arranged on the moving block, and the cooling medium enters the main air channel through the through hole.

[0016] Preferably, the inner part of the base is provided with an array of partitions, the partitions divide the inner part of the base into a plurality of independent placement areas, and the positioning members are arranged in the placement areas.

[0017] Preferably, the outer side of each placement area is provided with a delivery pipe, the delivery pipe is used for delivering the cooling medium into the placement area, and the cooling medium acts on the welding area through the main air channel after entering the placement area.

[0018] Preferably, the positioning member comprises a column fixedly connected with the base, a roller is arranged at the top of the column, and the outer side of the roller is in contact with the inner wall of the manifold body.

[0019] Technical effects and advantages of the present application: 1. The present application realizes dynamic self-adjustment of the cooling intensity by arranging the detection member, when the detection member senses the increase of the welding temperature, the telescopic member in the frame body drives the adjusting part to act, thereby increasing the delivery flow of the cooling medium, forming a cooling mechanism that can real-time feedback according to the actual welding heat input, effectively preventing the welding defects such as undercut caused by continuous high temperature, and avoiding the problems of excessive cooling or insufficient cooling caused by the traditional fixed cooling mode.

[0020] 2. The present application sets a partition, which can automatically form a local closed space in the manifold wall when increasing the cooling flow, effectively restricting the flow path of the cooling medium, preventing its disorderly diffusion to other welding areas, ensuring that the cooling effect is concentrated on the high temperature point. This area limiting function not only improves the local cooling efficiency, but also significantly reduces the risk of premature solidification of the molten pool metal due to cooling airflow interference with adjacent areas, and the formation of gas pores due to the inability of gas to escape in time, ensuring the density and joint strength of the weld. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the exhaust manifold of the present application; Figure 2 is a structural schematic diagram of the welding auxiliary equipment of the present application; Figure 3 is a structural schematic diagram of the base of the present application; Figure 4 is a structural schematic diagram of the positioning member of the present application; Figure 5 is a structural schematic diagram of the detection member of the present application; Figure 6 is a sectional view of the positioning member of the present application; Figure 7 is a structural schematic diagram of the partition of the present application.

[0022] In the drawings: 100, manifold body; 200, flange; 1, base; 2, placement area; 3, positioning member; 301, cylinder; 302, roller; 4, detection member; 401, frame; 402, telescopic part; 403, elastic member; 404, connecting rod; 405, adjusting part; 5, main gas channel; 6, gas distribution channel; 7, partition; 701, driving part; 702, movable cavity; 703, movable block; 704, channel. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. Embodiment one

[0024] The application provides an auxiliary device for exhaust manifold welding, which is used for dissipating heat at the welding position of the manifold body 100 and the flange 200, so as to offset the thermal stress generated by welding and reduce the stress concentration phenomenon.

[0025] Referring to Figures 1 to 6 The application provides an auxiliary device for exhaust manifold welding, which comprises a base 1 and further comprises a positioning member 3 arranged in the base 1 and used for positioning the manifold body 100 and the flange 200; the positioning member 3 is internally provided with arrayed cooling portions, which convey cooling medium to the welding position when the manifold body 100 and the flange 200 are welded, so as to offset the thermal stress generated by welding. The device further comprises a detection member 4, which comprises a frame 401 arranged outside the positioning member 3, and the frame 401 is internally provided with a temperature-sensing adjusting portion 405, which dynamically adjusts the flow of the cooling medium conveyed by the cooling portion to the welding position by detecting the welding temperature.

[0026] Referring to Figures 2 to 6 The positioning member 3 comprises a column 301 fixedly connected with the base 1, and the column 301 is provided at the top with a roller 302, and the outer side of the roller 302 is in close contact with the inner wall of the manifold body 100.

[0027] The connecting position of the column 301 and the roller 302 is provided with a limiting groove, and the limiting groove is internally provided with a spring, one end of the spring is connected with the roller 302, and the other end is connected with the limiting groove, so that when the roller 302 is in contact with the inner wall of the manifold body 100, if the diameter of the roller 302 is greater than the diameter of the inner wall of the manifold body 100, the manifold body 100 will exert a thrust force on the roller 302, so as to drive the roller 302 to move to the central area of the column 301, so as to adapt to manifold bodies 100 with different inner diameter.

[0028] Referring to Figure 5 And Figure 6 The temperature-sensing adjusting portion 405 comprises an extension portion 402, which is arrayed in the inside of the frame 401, and the bottom of the extension portion 402 is provided with an elastic member 403 connected with the frame 401.

[0029] The frame 401 is provided below with an adjusting portion 405 connected with the extension portion 402 through a connecting rod 404, and the adjusting portion 405 adjusts the flow of the medium into the cooling portion according to the extension amount of the extension portion 402.

[0030] The extension member comprises a capsule, the inside of the capsule is provided with a heat-expanding gas, the heat-expanding gas comprises ether, the connecting position of the capsule and the elastic member 403 is provided with a mounting block connected with the connecting rod 404.

[0031] When welding, the frame body 401 will receive the heat generated when the manifold body 100 and the flange 200 are welded, and when the frame body 401 receives a high amount of heat, the telescopic part 402 will be heated and elongated, and the telescopic part 402 will push the adjusting part 405 downward through the connecting rod 404 to adjust the flow of the medium into the cooling part.

[0032] Referring to Figure 5 As shown, the adjusting part 405 includes a moving block, and the moving block is provided with a through hole that gradually expands from bottom to top, and the cooling medium enters the main air duct 5 through the through hole.

[0033] In the initial state, the moving block column 301 is in close contact, and when the telescopic part 402 pushes the moving block downward, the through hole is in communication with the main air duct 5. Due to the special structure of the through hole, the communication area between the through hole and the main air duct 5 increases when the moving block is moved downward, thereby adjusting the flow of the medium into the cooling part.

[0034] Referring to Figure 5 As shown in Figure 6 The cooling part includes an array of main air ducts 5 arranged inside the positioning member 3, and the main air ducts 5 are provided with an array of branch air ducts 6; the gas outlet of the branch air duct 6 faces the top of the positioning member 3, and the diameter of the branch air duct 6 is smaller than that of the main air duct 5.

[0035] Referring to Figure 3 As shown, the inside of the base 1 is provided with an array of partitions, and the partitions divide the internal area of the base 1 into a plurality of independent installation areas 2, and the positioning member 3 is arranged inside the installation areas 2.

[0036] Referring to Figure 2 As shown in Figure 3 The outer side of the installation area 2 is provided with a conveying pipe, which is used to convey the cooling medium into the installation area 2, and the cooling medium enters the installation area 2 and acts on the welding area through the main air duct 5.

[0037] In actual application, first, the flange 200 is placed stably on the base 1, and it is ensured that the flange 200 is in close contact with the frame body 401; at this time, the column 301 is located in the inner ring area of the flange 200, and then the manifold body 100 is inserted into the inner ring of the flange 200, so that the manifold body 100 is sleeved on the column 301, and the inner wall of the manifold body 100 is limited by the rollers 302 arranged on the column 301, so as to ensure the relative position stability between the manifold body 100 and the column 301.

[0038] It should be noted that, due to the difference in the inner diameter of the manifold body 100 to some extent, in order to adapt to the manifold body 100 with different inner diameters, the roller 302 and the column 301 are connected in an elastic manner in this embodiment, so that the roller 302 can automatically adjust the position according to the change of the inner diameter of the manifold body 100, thereby realizing effective limiting of the manifold body 100 with different specifications.

[0039] It should be noted that, in this embodiment, the top of the frame 401 is at the same height as the top of the base 1.

[0040] After the connection of the manifold body 100 and the column 301 is completed, the worker can manually operate or automatically control the welding operation of the connection between the flange 200 and the manifold body 100.

[0041] During the welding process, the external cooling device supplies cooling medium to the placement area 2 distributed in the base 1, and the cooling medium enters the inside of the placement area 2, flows into the main gas channel 5 through the through hole, and is finally sprayed out from the branch gas channel 6 distributed on the main gas channel 5. The cooling medium sprayed out from the branch gas channel 6 directly acts on the connection between the flange 200 and the manifold body 100, and performs targeted heat dissipation on this area, thereby effectively avoiding the thermal deformation phenomenon of the flange 200 and the exhaust manifold at the connection during the welding process due to high temperature, and ensuring the welding quality.

[0042] It should be noted that, after the cooling medium sprayed from the branch gas channel 6 acts on the connection between the flange 200 and the manifold body 100, it is discharged from the other end of the manifold body 100 along the direction of the manifold body 100.

[0043] During the heat dissipation of the branch gas channel 6 on the welding position, the frame 401 will absorb the heat generated by the welding of the manifold body 100 and the flange 200. When the heat absorbed by the frame 401 is high, it indicates that the wire feeding rate of the welding gun is too low, causing the temperature of the welding area where the welding gun is located to be higher than that of other areas. At this time, affected by the temperature rise, the telescopic part 402 located inside the frame 401 will gradually elongate and push the moving block downward through the connecting rod 404, thereby increasing the communication area of the through hole and the main gas channel 5. After the communication area is increased, the flow of cooling medium entering the inside of the main gas channel 5 increases, so that the cooling medium sprayed from the branch gas channel 6 increases, thereby improving the cooling effect of the welding area with too high temperature, effectively avoiding the undercut phenomenon caused by the low wire feeding rate and the long-time local heating of the electric arc during the welding process of the exhaust manifold and the flange 200, and ensuring the welding quality.

[0044] In this embodiment, the telescopic parts 402 are arranged in a ring array inside the frame 401. When the welding temperature of a certain area is too high, the corresponding telescopic part 402 of the area will be elongated, thereby improving the cooling efficiency of the gas distribution pipe corresponding to the area, realizing differential cooling. The differential cooling can automatically adjust the flow of the cooling medium according to the welding temperature of different areas, ensure the uniformity of the temperature of each area during welding, and further improve the welding quality. Embodiment two

[0045] Although the foregoing embodiment realizes the effect of implementing differential cooling on the area with excessively high welding temperature by means of the telescopic part 402, however, in view of the circular structure of the manifold body 100, when the cooling medium is sprayed from the gas distribution channel 6, it will be restricted by the shape of the manifold body 100, and the medium will diffuse to both sides. This diffusion phenomenon will cause the cooling speed of other areas to increase, so that the molten pool metal solidifies rapidly, and the gas cannot be separated in time and is wrapped inside the weld, finally forming pores, reducing the strength and compactness of the welded joint. In view of this, technical improvement is made on the basis of embodiment one, and the improved technical scheme is as follows: Referring to Figures 1 to 7 As shown in the figure, the exhaust manifold welding auxiliary equipment further comprises a partition 7 located outside the positioning member 3. When the flow of the cooling medium delivered by the cooling part to the welding position increases, the partition 7 limits the cooling area corresponding to the cooling part.

[0046] Referring to Figure 7 As shown in the figure, the partition 7 comprises a movable cavity 702 symmetrically arranged outside the main gas channel 5. The movable cavity 702 is internally provided with a movable block 703. When the movable block 703 is in the extended state, the end of the movable block 703 away from the movable cavity 702 is in contact with the inner ring of the manifold body 100. The partition 7 further comprises a driving part 701 symmetrically arranged inside the main gas channel 5. When the flow of the cooling medium flowing into the main gas channel 5 increases, the driving part 701 drives the movable block 703 in the movable cavity 702 to be in the extended state.

[0047] The driving part 701 comprises a capsule arranged inside the main gas channel 5. The capsule is in communication with the movable cavity 702 through a channel 704, The partition 7 further comprises the channel 704. One end of the channel 704 is in communication with the main gas channel 5, and the other end is in communication with the movable cavity 702.

[0048] In use, when the telescopic part 402 pushes the moving block to move downward by means of the connecting rod 404, the flow of the cooling medium entering the main air passage 5 increases, and the pressure inside the main air passage 5 also synchronously rises; when the air pressure in the main air passage 5 reaches a certain degree, the air pressure will generate a pressing effect on the driving part 701, so that the driving part 701 shrinks, and the medium in the driving part 701 flows into the movable cavity 702 through the preset channel 704; the movable cavity 702 is provided with a movable block 703, and the movable block 703 is in sealing and slidable connection with the movable cavity 702 through a spring; when the medium in the driving part 701 enters the movable cavity 702, the movable block 703 is pushed to move towards the outside of the columnar body 301, and finally the movable block 703 is tightly attached to the inner wall of the manifold body 100.

[0049] After the movable block 703 is attached to the inner wall of the manifold body 100, a limiting effect on the cooling area corresponding to the welding area with excessively high temperature is formed, specifically, on the one hand, the movable block 703 and the inner wall of the manifold body 100 form a limiting area, which can effectively prevent the medium sprayed from the cooling part corresponding to the cooling area from spreading around, thereby avoiding adversely affecting the heat dissipation efficiency of other areas; on the other hand, under the limiting effect of the movable block 703, the cooling medium is more gathered in the space surrounded by the movable block 703, thereby further improving the cooling efficiency for the welding area with excessively high temperature.

[0050] Finally, it should be noted that: the above only describes the preferred embodiments of the present application, and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

[0051] Although the embodiments of the present application have been shown and described, for those skilled in the art, various changes, modifications, replacements and deformations can be made to the embodiments without departing from the principles and spirits of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An exhaust manifold welding aid comprising a base, characterised in that, Also include: Positioning member, which is arranged in the base inside, for the manifold body and flange positioning; Cooling part, which is arranged in the inside of the positioning member, when the manifold body and the flange are welded, it transports cooling medium to the welding place to offset the thermal stress generated by welding; Detection member, which includes a frame arranged outside the positioning member, the frame is provided with a temperature sensing adjusting part inside, which dynamically adjusts the cooling medium flow transported by the cooling part to the welding place by detecting the welding temperature; The partition member is located outside the positioning member, when the cooling medium flow transported by the cooling part to the welding place increases, the partition member limits the corresponding cooling area of the cooling part.

2. The exhaust manifold welding aid of claim 1, wherein, The temperature sensing adjusting part includes: The telescopic part is arranged in the inside of the frame, and the bottom of the telescopic part is provided with an elastic member connected with the frame; The adjusting part is located below the frame and is connected with the telescopic part through a connecting rod, and the adjusting part adjusts the medium flow into the cooling part according to the telescopic amount of the telescopic part.

3. The exhaust manifold welding aid of claim 2, wherein, The cooling part includes a main gas channel arranged in the inside of the positioning member, and the main gas channel is provided with an array of branch gas channels.

4. The exhaust manifold welding aid of claim 3, wherein, The outlet of the branch gas channel is directed to the top of the positioning member, and the diameter of the branch gas channel is smaller than that of the main gas channel.

5. The exhaust manifold welding aid of claim 3, wherein, The partition member includes: The movable cavity is symmetrically arranged outside the main gas channel, and the movable cavity is provided with a movable block inside, when the movable block is in the extended state, the end of the movable block away from the movable cavity is in contact with the inner ring of the manifold body; The driving part is symmetrically arranged in the inside of the main gas channel, when the cooling medium flow into the main gas channel increases, the driving part drives the movable block in the movable cavity to be in the extended state.

6. The exhaust manifold welding aid of claim 5, wherein, The partition member further includes a channel, one end of the channel is communicated with the main gas channel, and the other end of the channel is communicated with the movable cavity.

7. The exhaust manifold welding aid of claim 3, wherein, The adjusting part includes a moving block, the moving block is provided with a through hole which gradually expands from bottom to top, and the cooling medium enters the main gas channel through the through hole.

8. The exhaust manifold welding aid of claim 1, wherein, The inside of the base is provided with an array of partition plates, the partition plates separate the inside of the base into a plurality of independent installation areas, and the positioning members are arranged in the installation areas.

9. The exhaust manifold welding aid of claim 8, wherein, The outside of the installation area is provided with a conveying pipe, the conveying pipe is used for conveying cooling medium into the inside of the installation area, and the cooling medium enters the installation area and acts on the welding area through the main gas channel.

10. The exhaust manifold welding aid of claim 1, wherein, The positioning member includes a column fixedly connected with the base, the top of the column is provided with a roller, and the outer side of the roller is in contact with the inner wall of the manifold body.

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