A welding fixture for an automobile air outlet pipe

Abstract

The application relates to a welding clamp for a car air outlet pipe, which comprises a seat plate, a back plate vertically fixed on the top of the seat plate, a forming cylinder horizontally fixed on the front side outer wall of the back plate, a first roll forming mechanism arranged on the seat plate and matched with the forming cylinder, and two second roll forming mechanisms symmetrically arranged on the left and right sides of the forming cylinder, wherein the edge of the front end closed part of the forming cylinder is formed with a conical cabin arranged concentrically; the first roll forming mechanism comprises a bottom plate horizontally fixed on the bottom of the seat plate, a lifting plate horizontally arranged below the bottom plate, a plurality of jacking columns vertically inserted and connected in the bottom plate, two jacking cylinders fixed on the bottom of the bottom plate and arranged symmetrically left and right, and a roll forming seat movably inserted and arranged in the seat plate and located below the front end closed part of the forming cylinder; the application can automatically complete roll forming of the conical reducing pipe and welding seam polishing before and after welding respectively, thereby saving more time, greatly simplifying the processing process, effectively improving the processing efficiency, and being suitable for large-area popularization.

Description

Technical Field

[0001] This invention relates to the field of welding fixture technology, and in particular to a welding fixture for an automobile exhaust pipe. Background Technology

[0002] The exhaust pipe is a key pipe in the automotive cooling system that connects the expansion tank and the radiator. It is mainly used to guide the steam generated by the radiator and water jacket during engine operation into the expansion tank to achieve liquid-gas separation. Most exhaust pipes are made of stainless steel and are welded together from multiple sections of pipes with different shapes and directions, including tapered reducers.

[0003] Tapered reducers are made from fan-shaped raw material plates through rolling and welding. Currently, the rolling and welding steps for tapered reducers are performed sequentially and separately. After welding, the internal and external welds of the tapered reducer must be inspected and ground on grinding equipment. However, the existing welding fixtures for tapered reducers only have welding positioning functions. Therefore, the processing of tapered reducers must be completed in corresponding equipment and involves multiple loading, unloading, and transfer processes. These processes consume a lot of time and make the processing cumbersome, resulting in low processing efficiency. In addition, in order to complete the above processing, manufacturers must simultaneously equip themselves with rolling, welding, and grinding equipment, which occupies a lot of space and wastes money. This issue urgently needs to be resolved. Summary of the Invention

[0004] In view of the current state of the prior art, the technical problem to be solved by the present invention is to provide a welding fixture for automotive exhaust pipes that can automatically complete the rolling and forming and weld grinding before and after welding, respectively, thereby eliminating the need for multiple loading, unloading and transfer processes, thus saving more time and greatly simplifying the processing process and effectively improving processing efficiency. It can also save manufacturers a lot of space and avoid waste of funds, making it suitable for large-scale promotion.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a welding fixture for an automobile exhaust pipe, characterized in that it includes a seat plate, a back plate vertically fixed to the top of the seat plate, a forming cylinder horizontally fixed to the outer wall of the front side of the back plate, a first rolling mechanism disposed on the seat plate and cooperating with the forming cylinder, and two second rolling mechanisms symmetrically disposed on the left and right sides of the forming cylinder. The front end of the forming cylinder has a concentric conical chamber formed at the edge of the closed portion facing forward. A material receiving groove communicating with the interior of the conical chamber is opened at the vertical midpoint of the upper outer wall of the conical chamber.

[0006] It also includes a grinding mechanism, which includes multiple first guide rods that are horizontally interwoven in the back plate and are evenly arranged at equal angles along the circumference, a movable disk that is vertically and movably disposed inside the rear opening of the forming cylinder, a grinding motor that is fixed on the front outer wall of the movable disk and located inside the forming cylinder, a concentric and detachably fixed concentric grinding head that is fixed on the rotating shaft of the grinding motor and is concentrically disposed inside the conical chamber, and a displacement cylinder that is fixed on the rear outer wall of the back plate.

[0007] The telescopic end of the displacement cylinder passes laterally through the back plate and is fixed to the rear outer wall of the moving disk. The front end of each of the first guide rods extends into the opening of the forming cylinder and is fixed to the rear outer wall of the moving disk. The rotating shaft of the grinding motor is arranged laterally forward and is concentrically distributed with the forming cylinder. The slope of the outer wall of the conical grinding head is equal to the slope of the inner wall of the conical chamber. The outer diameter of the large diameter end of the conical grinding head is smaller than the inner diameter of the large opening end of the conical chamber.

[0008] It also includes a discharge mechanism, which includes two side plates that are vertically fixed to the outer rear wall of the back plate and symmetrically arranged on the left and right, a tail plate that is vertically fixed between the outer rear walls of the two side plates, a discharge cylinder fixed on the tail plate, three second guide rods that are horizontally inserted in the back plate and uniformly surrounded around the periphery of the forming cylinder at equal angles along the circumference, a three-pronged traction plate fixed between the rear ends of the three second guide rods and located between the two side plates, and three adsorption components that are uniformly arranged on the forming cylinder at equal angles along the circumference and respectively connected to the three second guide rods. The telescopic end of the discharge cylinder passes horizontally forward through the tail plate and is fixed on the three-pronged traction plate.

[0009] Preferably, the first rolling mechanism includes a base plate horizontally fixed to the bottom of the seat plate, a lifting plate horizontally disposed below the base plate, a plurality of lifting columns vertically inserted and connected in the base plate, two lifting cylinders fixed to the bottom of the base plate and symmetrically arranged on the left and right, and a rolling seat movably inserted in the seat plate and located below the front closed end of the forming cylinder. The upper and lower ends of each lifting column are respectively fixed to the bottom of the rolling seat and the top of the lifting plate. The telescopic ends of each lifting cylinder are vertically downward and fixed to the lifting plate. The rear edge of the top of the rolling seat forms a semi-conical cavity that cooperates with the lower outer wall of the conical chamber.

[0010] Preferably, the second rolling mechanism includes a base fixed to the top of the base plate, a traction plate laterally and movably connected to the top of the base to have left and right translation function, a support fixed to the top of the traction plate facing the forming cylinder, a first rolling block fixed to the support plate facing the forming cylinder and cooperating with the corresponding outer wall of the upper part of the conical cabin, a second rolling block fixed to the first rolling block facing the forming cylinder and cooperating with the corresponding outer wall of the upper part of the conical cabin, and a traction cylinder fixed to the base, wherein the extension end of the traction cylinder is arranged laterally and facing the forming cylinder and fixed to the traction plate.

[0011] Preferably, a conical notch is formed at the lower corner of the outer wall of the first roll block facing the forming cylinder, which cooperates with the corresponding outer wall of the upper part of the conical compartment. A forming conical surface is formed on the bottom outer wall of the second roll block, which cooperates with the corresponding outer wall of the upper part of the conical compartment. The edge of the forming conical surface facing the first roll block and the edge of the conical notch facing the second roll block are connected to each other.

[0012] Preferably, the adsorption assembly includes a pusher bar that is movably embedded inside the outside of the forming cylinder and the conical chamber to have a forward and backward translation function, and a plurality of vacuum suction cups fixed to the front end of the pusher bar and arranged sequentially from front to back. The rear end of the pusher bar is fixed to the front end of the second guide rod.

[0013] Preferably, the outer walls of the forming cylinder and the conical chamber are respectively provided with three guide straight grooves and guide inclined grooves evenly distributed at equal angles along the circumference. The rear ends of the three guide inclined grooves are respectively connected to the front ends of the three guide straight grooves. The pusher strips in the three adsorption components are respectively movably embedded in the three guide straight grooves. The front end of the pusher strip forms an inclined extension section that cooperates with the guide inclined groove. The extension section on the pusher strip in the three adsorption components is respectively movably embedded in the three guide inclined grooves. Each vacuum suction cup is fixed on the outer wall of the extension section.

[0014] Preferably, it further includes a feeding mechanism, which includes two transfer frames movably connected to the top of the seat plate, each having the function of forward and backward translation, and symmetrically arranged on the left and right sides of the rolling seat; a traction beam laterally fixed between the front outer walls of the two transfer frames; a feeding cylinder fixed to the top of the seat plate and located in front of the traction beam; and two positioning units respectively arranged on the two transfer frames and symmetrically distributed on the left and right. The extension end of the feeding cylinder is laterally arranged to the rear and fixed on the traction beam.

[0015] Preferably, the positioning unit includes a material support plate that is tilted and fixed to the top of the material transfer rack, and a stop block that is tilted and fixed to the front outer wall of the material support plate and can be adjusted horizontally to fix its position. The top of the stop block forms a baffle that is parallel to the material support plate and extends to the top of the material support plate. The bottom outer wall of the baffle is slidably attached to the top outer wall of the material support plate.

[0016] Preferably, each of the two positioning units has a symmetrically distributed positioning notch at the rear corner of the baffle on the opposite side of the stop; and a limiting groove is also provided on the inner wall of each positioning notch.

[0017] Preferably, a notch clearance groove is formed at the corner of the top of the second roll block facing the forming cylinder.

[0018] Compared with the prior art, the advantages of the present invention are as follows:

[0019] This invention integrates the rolling and forming of tapered reducing pipes and the grinding of weld seams onto the same welding fixture. This allows for the automatic completion of the rolling and forming of tapered reducing pipes and the grinding of weld seams before and after welding, eliminating the need for multiple loading, unloading, and transfer processes. This saves considerable time and significantly simplifies the processing, thereby effectively improving processing efficiency. Furthermore, it saves manufacturers significant space and avoids wasting funds, making it suitable for widespread adoption. Attached Figure Description

[0020] The above and other features, advantages, and aspects of the embodiments of this application will become more apparent when taken in conjunction with the accompanying drawings and the following detailed description; throughout the drawings, the same or similar reference numerals denote the same or similar elements; it should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale; in the drawings:

[0021] Figure 1 This is a top view of the left front side of the present invention;

[0022] Figure 2 This is a top-view structural diagram of the left front side of the present invention;

[0023] Figure 3 This is a top view of the left front side of the roll base of the present invention;

[0024] Figure 4 This is a top view of the left front side of the forming cylinder and the discharge mechanism of the present invention;

[0025] Figure 5 This is an exploded top view of the grinding mechanism and the discharge mechanism of the present invention from the left rear side.

[0026] Figure 6 For the present invention in Figure 5 A magnified view of the structure at point A in the diagram;

[0027] Figure 7 This is an exploded top view of the left rear side of the feeding mechanism of the present invention. Detailed Implementation

[0028] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly. The term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0029] To keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.

[0030] like Figures 1-7 As shown, a welding fixture for an automobile exhaust pipe includes a base plate 1, a back plate 7 vertically fixed to the top of the base plate 1, a forming cylinder 4 horizontally fixed to the outer wall of the front side of the back plate 7, a first rolling mechanism 2 disposed on the base plate 1 and cooperating with the forming cylinder 4, and two second rolling mechanisms 3 symmetrically disposed on the left and right sides of the forming cylinder 4.

[0031] The front end of the forming cylinder 4 has a concentric conical chamber 41 with the edge facing forward. The upper outer wall of the conical chamber 41 has a material trough 42 that communicates with the interior of the conical chamber 41 at the vertical midpoint.

[0032] It also includes a grinding mechanism 5, which includes multiple first guide rods 54 that are horizontally interwoven in the back plate 7 and are evenly arranged at equal angles along the circumference; a movable disk 52 that is vertically and movably disposed inside the rear opening of the forming cylinder 4; a grinding motor 55 that is fixed on the front outer wall of the movable disk 52 and located inside the forming cylinder 4; a concentric and detachably fixed concentrically disposed concentrically on the rotating shaft of the grinding motor 55 and inside the conical chamber 41; and a displacement cylinder 53 that is fixed on the rear outer wall of the back plate 7.

[0033] The telescopic end of the shift cylinder 53 passes laterally through the back plate 7 and is fixed on the rear outer wall of the moving disk 52. The front end of each first guide rod 54 extends into the opening of the forming cylinder 4 and is fixed on the rear outer wall of the moving disk 52. The rotating shaft of the grinding motor 55 is set laterally forward and is concentrically distributed with the forming cylinder 4. The slope of the outer wall of the conical grinding head 51 is equal to the slope of the inner wall of the conical chamber 41. The outer diameter of the large diameter end of the conical grinding head 51 is smaller than the inner diameter of the large opening end of the conical chamber 41.

[0034] The first rolling mechanism 2 includes a base plate 21 horizontally fixed to the bottom of the base plate 1, a lifting plate 22 horizontally disposed below the base plate 21, several lifting columns 24 vertically inserted and connected in the base plate 21, two lifting cylinders 23 fixed to the bottom of the base plate 21 and symmetrically arranged on the left and right, and a rolling seat 25 movably inserted in the base plate 1 and located below the front end of the forming cylinder 4. The upper and lower ends of each lifting column 24 are fixed to the bottom of the rolling seat 25 and the top of the lifting plate 22, respectively. The telescopic ends of each lifting cylinder 23 are vertically downward and fixed to the lifting plate 22. The rear edge of the top of the rolling seat 25 forms a semi-conical cavity 251 that cooperates with the lower outer wall of the conical chamber 41.

[0035] The second rolling mechanism 3 includes a base 36 fixed to the top of the base plate 1, a traction plate 31 laterally and movably connected to the top of the base 36 to have left and right translation function, a support frame 32 fixed to the top of the traction plate 31 facing the side of the forming cylinder 4, a first rolling block 33 fixed to the support frame 32 facing the side of the forming cylinder 4 and cooperating with the corresponding outer wall of the upper part of the conical chamber 41, a second rolling block 34 fixed to the first rolling block 33 facing the side of the forming cylinder 4 and cooperating with the corresponding outer wall of the upper part of the conical chamber 41, and a traction cylinder 35 fixed to the base 36. The extension end of the traction cylinder 35 is arranged laterally and towards the direction of the forming cylinder 4 and fixed to the traction plate 31.

[0036] A conical notch 331 is formed at the lower corner of the outer wall of the first roll of circular block 33 facing the forming cylinder 4, which matches the corresponding outer wall of the upper part of the conical chamber 41. A forming conical surface 341 is formed on the bottom outer wall of the second roll of circular block 34, which matches the corresponding outer wall of the upper part of the conical chamber 41. The edge of the forming conical surface 341 facing the first roll of circular block 33 and the edge of the conical notch 331 facing the second roll of circular block 34 are connected to each other.

[0037] The top of the second roll of round block 34 has a notch relief groove 342 formed at the corner of the side facing the forming cylinder 4 so that the head of the welding gun can be inserted and moved.

[0038] A welding fixture for an automotive exhaust pipe further includes a discharge mechanism 6. The discharge mechanism 6 includes two side plates 66 vertically fixed to the rear outer wall of a back plate 7 and symmetrically arranged on the left and right; a tail plate 67 vertically fixed between the rear outer walls of the two side plates 66; a discharge cylinder 61 fixed on the tail plate 67; three second guide rods 63 transversely inserted in the back plate 7 and uniformly surrounding the periphery of the forming cylinder 4 at equal angles along the circumference; a three-pronged traction plate 62 fixed between the rear ends of the three second guide rods 63 and located between the two side plates 66; and three adsorption components uniformly arranged at equal angles along the circumference on the forming cylinder 4 and respectively connected to the three second guide rods 63. The telescopic end of the discharge cylinder 61 passes laterally forward through the tail plate 67 and is fixed on the three-pronged traction plate 62.

[0039] The adsorption assembly includes a pusher bar 64 that is movably embedded inside the outside of the forming cylinder 4 and the conical chamber 41 to have a forward and backward translation function, and a plurality of vacuum suction cups 65 fixed to the front end of the pusher bar 64 and arranged sequentially from front to back. The rear end of the pusher bar 64 is fixed to the front end of the second guide rod 63.

[0040] Three guide straight grooves 43 and guide inclined grooves 44 are respectively provided on the outer walls of the forming cylinder 4 and the conical chamber 41, which are evenly distributed at equal angles along the circumference. The rear ends of the three guide inclined grooves 44 are respectively connected to the front ends of the three guide straight grooves 43.

[0041] The pusher strips 64 in the three adsorption components are respectively movably embedded in the three guide grooves 43. The front end of the pusher strip 64 forms an extension section 641 that is inclined and cooperates with the guide groove 44. The extension section 641 on the pusher strip 64 in the three adsorption components is respectively movably embedded in the three guide grooves 44. Each vacuum suction cup 65 is fixed on the outer wall of the extension section 641.

[0042] The rear end of the pusher bar 64 also forms a connecting section 642, and the front ends of the three second guide rods 63 are respectively fixed on the connecting section 642 on the pusher bar 64 in the three adsorption components.

[0043] A welding fixture for an automotive exhaust pipe further includes a feeding mechanism 8. The feeding mechanism 8 includes two transfer racks 83 movably connected to the top of the seat plate 1, each having a forward and backward translation function, and symmetrically arranged on the left and right sides of the rolling seat 25; a traction beam 82 laterally fixed between the front outer walls of the two transfer racks 83; a feeding cylinder 81 fixed to the top of the seat plate 1 and located in front of the traction beam 82; and two positioning units respectively arranged on the two transfer racks 83 and symmetrically distributed on the left and right. The extension end of the feeding cylinder 81 is laterally rearward and fixed on the traction beam 82.

[0044] The positioning unit includes a material support plate 84 that is tilted and fixed to the top of the material transfer rack 83, and a stop block 85 that is tilted and fixed to the front outer wall of the material support plate 84 and can be adjusted and fixed in the left and right sides. The top of the stop block 85 forms a baffle 851 that is parallel to the material support plate 84 and extends to the top of the material support plate 84. The bottom outer wall of the baffle 851 slides against the top outer wall of the material support plate 84.

[0045] Each of the two positioning units has a symmetrically distributed positioning notch 852 at the opposite rear corner of the baffle 851 on the stop 85.

[0046] A limiting groove 853 is also provided on the inner wall of the positioning notch 852.

[0047] Working principle:

[0048] The telescopic end of the feeding cylinder 81 in the drive feeding mechanism 8 retracts inward to drive the two positioning units forward with the help of the traction beam 82 and the two material transfer frames 83 until the two positioning units are in front of the forming cylinder 4; then the fan-shaped raw material plate 9 is placed obliquely between the top outer walls of the material support plate 84 in the two positioning units and the two straight edge corners of the fan-shaped raw material plate 9 are respectively embedded into the positioning notch 852 on the stop block 85 in the two positioning units; then the protrusions 91 located at the two straight edge corners of the fan-shaped raw material plate 9 are respectively embedded into the two limiting grooves 853 to complete the placement and positioning of the fan-shaped raw material plate 9.

[0049] Next, the extension end of the feed cylinder 81 is extended outward to similarly move the fan-shaped raw material plate 9 backward between the rolling seat 25 and the conical chamber 41. Before this, the extension ends of each lifting cylinder 23 in the first rolling mechanism 2 are extended outward to move each lifting column 24 downward with the help of the lifting plate 22, thereby moving the rolling seat 25 synchronously. At the same time, the extension ends of the traction cylinders 35 in the two second rolling mechanisms 3 are retracted inward to move the two first rolling blocks 33 and the two second rolling blocks 34 away from each other with the help of the two traction plates 31 and the two support frames 32.

[0050] After the fan-shaped raw material plate 9 is moved between the rolling seat 25 and the conical chamber 41, the telescopic ends of each lifting cylinder 23 are driven to retract inward to drive the rolling seat 25 to move upward in the same way. Then, with the help of the semi-conical cavity 251, the middle part of the fan-shaped raw material plate 9 is bent upward into a cone shape and wrapped around the lower outer side of the conical chamber 41. At this time, the two straight edges on the fan-shaped raw material plate 9 are both set upward.

[0051] Next, the telescopic ends of the traction cylinders 35 in the two second rolling mechanisms 3 are extended outwards to similarly drive the two first rolling blocks 33 and the two second rolling blocks 34 to move closer to each other. Then, with the help of the conical notch 331 on the first rolling block 33 and the forming conical surface 341 on the second rolling block 34, the two straight edges of the fan-shaped raw material plate 9 are also bent into cones and wrapped around the upper outer side of the conical chamber 41. At this time, the two straight edges of the fan-shaped raw material plate 9 are located on the left and right sides of the material receiving groove 42, respectively. Then, the welding gun tip can be inserted into the straight area formed by the notch clearance groove 342 on the two second rolling blocks 34 and the straight seam welding can be completed. During the bending, the extension section 641 on the pusher bar 64 in each adsorption component and each vacuum suction cup 65 are located inside the guide groove 44, so they will not affect the rolling process of the fan-shaped raw material plate 9.

[0052] Since the molten welding wire inevitably enters the material tank 42 and forms an internal weld, and since a small amount of the internal weld will also enter the conical chamber 41 after solidification, the internal weld extending into the conical chamber 41 must be removed. At this time, the telescopic end of the shift cylinder 53 in the grinding mechanism 5 can be driven to extend outward to drive the conical grinding head 51 forward with the help of the moving disk 52 and the grinding motor 55, so that the outer wall of the conical grinding head 51 gradually approaches the inner wall of the conical chamber 41. At the same time, the grinding motor 55 is started to rotate its rotating shaft, thereby driving the conical grinding head 51 to rotate. When the conical grinding head 51 contacts the internal weld extending into the conical chamber 41, it will automatically grind it to remove it.

[0053] After grinding, the telescopic end of the discharge cylinder 61 in the drive discharge mechanism 6 extends outward to drive the three adsorption components forward with the help of the three-pronged traction plate 62 and the three second guide rods 63. This causes the extension section 641 on the push bar 64 in each adsorption component to extend to the front of the conical chamber 41, so that each vacuum suction cup 65 extends into the large end of the rolled conical reducer tube until the adsorption end of each vacuum suction cup 65 is attached to the inner wall of the conical reducer tube. After each vacuum suction cup 65 is started, it can adsorb the inner wall of the conical reducer tube.

[0054] After adsorption, the extension and retraction ends of the traction cylinders 35 in the two second rolling mechanisms 3 are retracted inward to drive the two first rolling blocks 33 and the two second rolling blocks 34 to move away from each other. At the same time, the extension and retraction ends of each lifting cylinder 23 are extended outward to drive the rolling seat 25 to move down. The extension and retraction ends of the feeding cylinder 81 are also driven to retract inward to drive the two positioning units to move forward in preparation for placing the next fan-shaped raw material plate 9.

[0055] Finally, continue to drive the extension end of the discharge cylinder 61 in the discharge mechanism 6 to extend outward, so as to drive the adsorbed tapered variable diameter tube forward to leave the tapered chamber 41. After that, simply close each vacuum suction cup 65 and remove the tapered variable diameter tube with the help of a robot or manually.

[0056] This invention integrates the rolling and forming of tapered reducing pipes and the grinding of weld seams onto the same welding fixture. This allows for the automatic completion of the rolling and forming of tapered reducing pipes and the grinding of weld seams before and after welding, eliminating the need for multiple loading, unloading, and transfer processes. This saves considerable time and significantly simplifies the processing, thereby effectively improving processing efficiency. Furthermore, it saves manufacturers significant space and avoids wasting funds, making it suitable for widespread adoption.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A welding jig for an automobile exhaust pipe, characterized by comprising: The device includes a base plate, a back plate vertically fixed to the top of the base plate, a forming cylinder horizontally fixed to the outer wall of the front side of the back plate, a first rolling mechanism disposed on the base plate and cooperating with the forming cylinder, and two second rolling mechanisms symmetrically disposed on the left and right sides of the forming cylinder. The front end of the forming cylinder has a concentric conical chamber formed with its closed edge facing forward. The upper outer wall of the conical chamber has a material receiving groove that communicates with the interior of the conical chamber at its vertical midpoint. It also includes a grinding mechanism, which includes multiple first guide rods that are horizontally interwoven in the back plate and are evenly arranged at equal angles along the circumference, a movable disk that is vertically and movably disposed inside the rear opening of the forming cylinder, a grinding motor that is fixed on the front outer wall of the movable disk and located inside the forming cylinder, a concentric and detachably fixed concentric grinding head that is fixed on the rotating shaft of the grinding motor and is concentrically disposed inside the conical chamber, and a displacement cylinder that is fixed on the rear outer wall of the back plate. The telescopic end of the displacement cylinder passes laterally through the back plate and is fixed to the rear outer wall of the moving disk. The front end of each of the first guide rods extends into the opening of the forming cylinder and is fixed to the rear outer wall of the moving disk. The rotating shaft of the grinding motor is arranged laterally forward and is concentrically distributed with the forming cylinder. The slope of the outer wall of the conical grinding head is equal to the slope of the inner wall of the conical chamber. The outer diameter of the large diameter end of the conical grinding head is smaller than the inner diameter of the large opening end of the conical chamber. It also includes a discharge mechanism, which includes two side plates that are vertically fixed to the outer rear wall of the back plate and symmetrically arranged on the left and right, a tail plate that is vertically fixed between the outer rear walls of the two side plates, a discharge cylinder fixed on the tail plate, three second guide rods that are horizontally inserted in the back plate and uniformly surrounded around the periphery of the forming cylinder at equal angles along the circumference, a three-pronged traction plate fixed between the rear ends of the three second guide rods and located between the two side plates, and three adsorption components that are uniformly arranged on the forming cylinder at equal angles along the circumference and respectively connected to the three second guide rods. The telescopic end of the discharge cylinder passes horizontally forward through the tail plate and is fixed on the three-pronged traction plate.

2. The welding fixture for a vehicle exhaust pipe according to claim 1, wherein The first rolling mechanism includes a base plate fixed horizontally to the bottom of the seat plate, a lifting plate horizontally located below the base plate, several lifting columns vertically inserted and connected in the base plate, two lifting cylinders fixed to the bottom of the base plate and symmetrically arranged on the left and right, and a rolling seat movably inserted in the seat plate and located below the front closed end of the forming cylinder. The upper and lower ends of each lifting column are respectively fixed to the bottom of the rolling seat and the top of the lifting plate. The telescopic ends of each lifting cylinder are vertically downward and fixed to the lifting plate. The rear edge of the top of the rolling seat forms a semi-conical cavity that cooperates with the lower outer wall of the conical chamber.

3. The welding fixture for a vehicle exhaust pipe according to claim 2, wherein The second rolling mechanism includes a base fixed to the top of the base plate, a traction plate laterally and movably connected to the top of the base to have left and right translation function, a support frame fixed to the top of the traction plate facing the forming cylinder, a first rolling block fixed to the support frame facing the forming cylinder and cooperating with the corresponding outer wall of the upper part of the conical cabin, a second rolling block fixed to the first rolling block facing the forming cylinder and cooperating with the corresponding outer wall of the upper part of the conical cabin, and a traction cylinder fixed to the base. The telescopic end of the traction cylinder is arranged laterally and facing the forming cylinder and fixed to the traction plate.

4. The welding fixture for a vehicle exhaust pipe according to claim 3, wherein A conical notch is formed at the lower corner of the outer wall of the first roll of round blocks facing the forming cylinder, which matches the corresponding outer wall of the upper part of the conical compartment. A forming conical surface is formed on the bottom outer wall of the second roll of round blocks, which matches the corresponding outer wall of the upper part of the conical compartment. The edge of the forming conical surface facing the first roll of round blocks and the edge of the conical notch facing the second roll of round blocks are connected to each other.

5. The welding fixture for an automobile exhaust pipe according to claim 1, characterized in that, The adsorption assembly includes a pusher bar that is movably embedded inside the outside of the forming cylinder and the conical chamber to have a forward and backward translation function, and multiple vacuum suction cups fixed to the front end of the pusher bar and arranged sequentially from front to back. The rear end of the pusher bar is fixed to the front end of the second guide rod.

6. The welding fixture for an automobile exhaust pipe according to claim 5, characterized in that, The outer walls of the forming cylinder and the conical chamber are respectively provided with three guide straight grooves and guide inclined grooves evenly distributed at equal angles along the circumference. The rear ends of the three guide inclined grooves are respectively connected to the front ends of the three guide straight grooves. The pusher strips in the three adsorption components are respectively movably embedded in the three guide straight grooves. The front end of the pusher strip forms an inclined extension section that cooperates with the guide inclined groove. The extension section on the pusher strip in the three adsorption components is respectively movably embedded in the three guide inclined grooves. Each vacuum suction cup is fixed on the outer wall of the extension section.

7. A welding fixture for an automotive exhaust pipe according to claim 2, characterized in that, It also includes a feeding mechanism, which includes two transfer frames movably connected to the top of the seat plate, each having the function of forward and backward translation, and symmetrically arranged on the left and right sides of the rolling seat; a traction beam laterally fixed between the front outer walls of the two transfer frames; a feeding cylinder fixed to the top of the seat plate and located in front of the traction beam; and two positioning units respectively arranged on the two transfer frames and symmetrically distributed on the left and right. The extension end of the feeding cylinder is arranged laterally to the rear and fixed on the traction beam.

8. The welding fixture for an automobile exhaust pipe according to claim 7, characterized in that, The positioning unit includes a material support plate that is tilted and fixed to the top of the material transfer rack, and a stop block that is tilted and fixed to the outer wall of the front side of the material support plate and can be adjusted horizontally to fix its position. The top of the stop block forms a baffle that is parallel to the material support plate and extends to the top of the material support plate. The bottom outer wall of the baffle is slidably attached to the top outer wall of the material support plate.

9. A welding fixture for an automotive exhaust pipe according to claim 8, characterized in that, Each of the two positioning units has a symmetrically distributed positioning notch at the rear corner of the baffle on the block; and a limiting groove is also provided on the inner wall of each positioning notch.

10. A welding fixture for an automobile exhaust pipe according to claim 3, characterized in that, The top of the second roll of round block has a notch or clearance groove formed at the corner facing the forming cylinder.

Images