Fixture for exhaust pipe machining

Abstract

The utility model provides a clamp for machining an exhaust pipe, and relates to the field of clamps. The clamping and rotating device comprises a fixing frame and an inner supporting frame. A motor is installed on the rear side face of the fixing frame, a small gear is installed on a motor shaft of the motor, a large gear is connected to the outer side face of the small gear in a meshed mode, a rotating disc is welded to the front side face of the large gear, a supporting column is welded to the front side face of the rotating disc, a guiding disc is welded to the front end of the supporting column, and a worm is rotationally connected to the rear side face of the guiding disc. A transmission rod is welded to the front end of the worm gear, a push disc is welded to the front end of the transmission rod, and the push disc is in sliding connection with the inner supporting frame; through the arrangement of the clamping and rotating device, rapid rotating and surface changing of the exhaust pipe fitting in the clamping state are achieved, the laser notch machining efficiency of the exhaust pipe fitting is improved, and the problem that the exhaust hole cutting efficiency is low due to the fact that a traditional clamp cannot conduct rotating, surface changing and hole cutting machining on the exhaust pipe is solved.

Description

Technical Field

[0001] The utility model belongs to the field of clamps, and more specifically, particularly relates to a clamp used for processing exhaust pipes. Background Art

[0002] The exhaust pipe is an important exhaust system component that can discharge the exhaust gas generated by the engine to reduce the engine pressure and ensure the continuous operation of the vehicle. At present, the exhaust steam generated by the automobile engine is accompanied by a huge noise when it is discharged under high pressure. Therefore, in order to achieve the silencing and drainage of the exhaust pipe, the outer surface of the exhaust pipe body will be punched by laser cutting process, and the sound absorption structure design of the microporous plate is used for silencing. During the laser cutting of the exhaust pipe, it is necessary to clamp the outer surface of the exhaust pipe with a fixture to ensure accurate laser cutting. Since the exhaust pipe is mostly a cylindrical barrel structure, the outside of the exhaust pipe needs to be punched around, that is, after the corresponding number of holes are cut on one side of the exhaust pipe, it needs to be loosened from the fixture, and then manually rotated at a certain angle and clamped again for laser cutting. It can be seen that the traditional fixture can only fix the position of the exhaust pipe, and the fixture cannot rotate and change the surface of the outer side of the exhaust pipe for cutting holes. Each time the surface is changed, the exhaust pipe needs to be removed from the fixture. The operation is cumbersome and complicated, which seriously affects the efficiency of laser cutting of the exhaust pipe. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a fixture for exhaust pipe processing to solve the problem that the traditional fixture cannot perform rotating and changing surface cutting processing on the exhaust pipe, resulting in low exhaust hole cutting efficiency.

[0004] The utility model provides a fixture for exhaust pipe processing, comprising a base plate; the four corners of the upper side surface of the base plate are welded and connected with columns, the top of the column is welded and connected with a bearing plate, and the upper side surface of the bearing plate is installed with a lifting ring; the bearing plate is welded and connected with the guide rod, and the left side of the bearing plate is connected with a cylinder by bolts, and the right end of the telescopic rod of the cylinder is installed with a push-pull block, and the front side and rear side of the push-pull block are hinged to the connecting rod; it also includes a two-way threaded rod, an exhaust pipe fitting, a clamping rotating device and a supporting device; the right end of the two-way threaded rod is installed with a turntable frame; the number of the clamping rotating device is two groups, and each group of the clamping rotating device includes a base frame, a fixed frame, a rotating disk, a pillar, a guide disk, an inner support frame, a push disk, a large gear, a motor, a worm gear, a clamping bolt, a clamping nut, a worm, a knob, a small gear and a transmission rod; the bottom end of the base frame is connected with a slide plate by bolts, and the front side of the base frame is connected with the fixed frame by clamping bolts and clamping nuts. The rear side of the fixed frame is equipped with an electric motor, and a small gear is installed on the motor shaft of the electric motor. The outer side of the small gear is meshed with a large gear. The front side of the large gear is welded with a rotating disk, and the front side of the rotating disk is welded with a pillar. The front end of the pillar is welded with a guide disk. The rear side of the guide disk is rotatably connected with a worm, and the outer side of the worm is meshed with a worm wheel. The front end of the worm wheel is welded with a transmission rod, and the front end of the transmission rod is welded with a push plate, and the push plate is slidably connected to the inner support frame; the inner support frame is a cylindrical structure, and a rectangular protrusion is provided at the rear end of the inner support frame, and the inner support frame is slidably connected to the guide plate; the front side of the fixed frame is rotatably connected to the large gear; the number of the supporting devices is two groups, and the supporting devices include a movable frame, a supporting plate, a knob and a threaded column; the lower side of the movable frame is hinged with a connecting rod, and the upper side of the movable frame is rotatably connected with a threaded column, and a knob is installed on the top of the threaded column; the outer side of the threaded column is meshed with a supporting plate.

[0005] In at least some embodiments, there are two groups of skateboards, which are symmetrically distributed on the left and right sides. Each group of skateboards is provided with threaded holes that pass through the left and right sides. The positive threaded end of the outer side surface of the bidirectional threaded rod is meshed and connected in the threaded hole of the left skateboard, and the reverse threaded end of the outer side surface of the bidirectional threaded rod is meshed and connected in the threaded hole of the right skateboard.

[0006] In at least some embodiments, the support plate is a V-shaped structure, a convex plate is provided on the rear side of the support plate, a threaded through hole is provided at the center of the convex plate, and the threaded column is engaged in the convex threaded through hole of the support plate.

[0007] In at least some embodiments, a through hole is provided at the center of the guide plate, the transmission rod is inserted into the center through hole of the guide plate, three groups of through grooves are provided on the outside of the center through hole of the guide plate, the through grooves of the guide plate are distributed in a circular array around the center through hole of the push plate, and the three groups of rectangular protrusions of the inner support frames are respectively embedded in the three groups of through grooves of the guide plate.

[0008] In at least some embodiments, the number of the movable frames is two groups, and the movable frames are L-shaped folding plate structures. A through groove is provided on the front side of the L-shaped folding plate of the movable frame, and the convex plate on the rear side of the supporting plate is inserted into the through groove of the movable frame. A protrusion is provided on the lower side of the movable frame, and a through hole is provided on the front side of the protrusion, and the guide rod is inserted into the through hole of the protrusion of the movable frame.

[0009] In at least some embodiments, the push plate is provided with three groups of oblique grooves extending front to back, the oblique grooves are distributed in a circular array around the central axis of the push plate, and the inner support frame of the cylindrical structure is embedded in the oblique grooves of the push plate.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] 1. In the utility model, a reversing rotating meshing transmission mechanism composed of a worm wheel and a worm in a clamping rotating device is used to drive a push plate welded to the front side of a transmission rod to rotate synchronously, so that the inner side walls of the three groups of oblique through grooves of the push plate respectively push the three groups of inner support frames to slide synchronously along the three groups of through grooves of the guide plate, thereby realizing that the inner support frames can contact and clamp the inner walls of the end positions of exhaust pipes of different diameters, thereby improving the clamping flexibility.

[0012] 2. In the utility model, a small gear and a large gear are driven by an electric motor to form a gear meshing reduction transmission mechanism, so that the large gear drives the exhaust pipe fittings clamped by three groups of inner supports to rotate around the central axis of the rotating disk through a rotating disk, a pillar and a guide disk, thereby realizing rapid rotation and face changing of the exhaust pipe fittings in a clamped state, abandoning the manual rotation and face changing method of the traditional fixture after releasing the exhaust pipe fittings, and improving the efficiency of laser cutting processing of exhaust pipe fittings.

[0013] 3. In the utility model, the sliding connecting rod motion mechanism formed by the push-pull block, the connecting rod and the movable frame is driven by the cylinder telescopic rod to operate, so that the two groups of movable frames push and pull the V-shaped supporting plates along the two groups of guide rods to contact and support the outer side of the exhaust pipe fittings, thereby preventing the exhaust pipe fittings from vibrating and rotating during the hole cutting process, and ensuring the accuracy of the hole cutting position of the exhaust pipe fittings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 It is a front view structural schematic diagram of the utility model.

[0016] Figure 3 It is a schematic diagram of the structure of the utility model when viewed from above and cut away.

[0017] Figure 4 It is a structural schematic diagram of the supporting device of the utility model.

[0018] Figure 5It is a schematic diagram of the rear side structure of the supporting device of the utility model.

[0019] Figure 6 It is a structural schematic diagram of the clamping and rotating device of the utility model.

[0020] Figure 7 It is a left-side structural schematic diagram of the clamping and rotating device of the utility model.

[0021] Figure 8 It is a schematic diagram of the top view of the structure of the clamping and rotating device of the utility model.

[0022] Fig. 9 It is a schematic diagram of the cutaway structure of the clamping and rotating device of the utility model.

[0023] Reference numerals:

[0024] 1. Bottom plate;

[0025] 2. Column;

[0026] 3. Rings;

[0027] 4. Cylinder;

[0028] 5. Turntable frame;

[0029] 6. Bidirectional threaded rod;

[0030] 7. Exhaust pipe fittings;

[0031] 8. Connecting rod;

[0032] 9. Push-pull block;

[0033] 10. Skateboard;

[0034] 11. Loading plate;

[0035] 12. Guide rod;

[0036] 13. Clamping and rotating device; 1301. Base frame; 1302. Fixed frame; 1303. Rotating plate; 1304. Pillar; 1305. Guide plate; 1306. Inner support frame; 1307. Push plate; 1308. Big gear; 1309. Motor; 1310. Worm gear; 1311. Clamping bolt; 1312. Clamping nut; 1313. Worm; 1314. Turning knob; 1315. Small gear; 1316. Transmission rod;

[0037] 14. Support device; 1401. Moving frame; 1402. Support plate; 1403. Knob; 1404. Threaded column. DETAILED DESCRIPTION

[0038] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0039] like Figure 1-Figure 9 As shown, the utility model provides a fixture for exhaust pipe processing, including a bottom plate 1; columns 2 are welded to the four corners of the upper side of the bottom plate 1, the top of the column 2 is welded to the bearing plate 11, and the upper side of the bearing plate 11 is installed with a lifting ring 3; the bearing plate 11 is welded to the guide rod 12, the left side of the bearing plate 11 is connected to the cylinder 4 by bolts, the right end of the telescopic rod of the cylinder 4 is installed with a push-pull block 9, and the front side and rear side of the push-pull block 9 are hinged with a connecting rod 8; it also includes a two-way threaded rod 6, an exhaust pipe fitting 7, a clamping and rotating device 13 and a supporting device 14; a turntable frame 5 is installed at the right end of the two-way threaded rod 6; the number of the clamping and rotating devices 13 is two groups Each set of clamping and rotating devices 13 includes a base frame 1301, a fixed frame 1302, a rotating disk 1303, a support column 1304, a guide disk 1305, an inner support frame 1306, a push disk 1307, a large gear 1308, a motor 1309, a worm gear 1310, a clamping bolt 1311, a clamping nut 1312, a worm 1313, a knob 1314, a small gear 1315 and a transmission rod 1316; the bottom end of the base frame 1301 is connected to the slide plate 10 by bolts, the front side of the base frame 1301 is connected to the fixed frame 1302 by clamping bolts 1311 and clamping nuts 1312, and the rear side of the fixed frame 1302 is installed with a motor 1309 A small gear 1315 is installed on the motor shaft of the motor 1309, and the outer side surface of the small gear 1315 is meshed with the large gear 1308, the front side surface of the large gear 1308 is welded with the rotating disk 1303, the front side surface of the rotating disk 1303 is welded with the pillar 1304, the front end of the pillar 1304 is welded with the guide disk 1305, the rear side surface of the guide disk 1305 is rotatably connected, the outer side surface of the worm 1313 is meshed with the worm wheel 1310, the front end of the worm wheel 1310 is welded with the transmission rod 1316, the front end of the transmission rod 1316 is welded with the push plate 1307, the push plate 1307 slides with the inner support frame 1306 Dynamic connection; the inner support frame 1306 is a cylindrical structure, and the rear end of the inner support frame 1306 is provided with a rectangular protrusion, and the inner support frame 1306 is slidably connected to the guide plate 1305; the front side of the fixed frame 1302 is rotatably connected to the large gear 1308; the number of the supporting device 14 is two groups, and the supporting device 14 includes a movable frame 1401, a supporting plate 1402, a knob 1403 and a threaded column 1404; the lower side of the movable frame 1401 is hinged with a connecting rod 8, and the upper side of the movable frame 1401 is rotatably connected to the threaded column 1404, and the top of the threaded column 1404 is installed with a knob 1403; the outer side of the threaded column 1404 is meshedly connected to the supporting plate 1402.

[0040] In the disclosed embodiment, there are two groups of skateboards 10, which are symmetrically distributed on the left and right. Each group of skateboards 10 is provided with threaded through holes that pass through the left and right sides. The positive threaded end of the outer side surface of the bidirectional threaded rod 6 is meshed and connected in the threaded through hole of the left skateboard 10, and the reverse threaded end of the outer side surface of the bidirectional threaded rod 6 is meshed and connected in the threaded through hole of the right skateboard 10, so that the two groups of skateboards 10 are synchronously driven to move left and right in the process of rotation of the bidirectional threaded rod 6, and the skateboards 10 are equipped with the clamping rotating device 13 to move left and right, and the distance between the two groups of clamping rotating devices 13 is adjusted. The two groups of clamping rotating devices 13 clamp the two ends of the exhaust pipe fittings 7 of different lengths.

[0041] In the disclosed embodiment, the support plate 1402 is a V-shaped structure. Through the V-shaped structure of the support plate 1402, the two groups of support plates 1402 can perform four-point contact support from the front and rear sides and the position near the bottom of the exhaust pipe fitting 7 to prevent the exhaust pipe fitting 7 from rotating due to the vibration of the laser cutting hole, thereby ensuring stable laser cutting. A convex plate is provided on the rear side surface of the support plate 1402, and a threaded through hole is provided at the center position of the convex plate, which passes through the upper and lower parts. The threaded column 1404 is meshed and connected in the threaded through hole of the convex plate of the support plate 1402, so that the support plate 1402 can adjust the support height according to the diameter of the exhaust pipe fitting 7.

[0042] In the disclosed embodiment, a through hole is provided at the center position of the guide plate 1305, and the transmission rod 1316 is inserted into the center through hole of the guide plate 1305. Three groups of through grooves are provided on the outer side of the center through hole of the guide plate 1305. The through grooves of the guide plate 1305 are distributed in a circular array around the center through hole of the push plate 1307. The three groups of rectangular protrusions of the inner support frame 1306 are respectively embedded in the three groups of through grooves of the guide plate 1305, so that the inner support frame 1306 can move in a directional manner along the through grooves of the guide plate 1305.

[0043] In the disclosed embodiment, there are two groups of movable frames 1401, and the movable frames 1401 are L-shaped folding plate structures. A through groove is provided on the front side of the L-shaped folding plate of the movable frame 1401, and the convex plate on the rear side of the supporting plate 1402 is inserted into the through groove of the movable frame 1401, so that the supporting plate 1402 can move vertically along the through groove of the movable frame 1401. A protrusion is provided on the lower side of the movable frame 1401, and a through hole is provided on the front side of the protrusion. The guide rod 12 is inserted into the through hole of the protrusion of the movable frame 1401. The movable frame 1401 can move left and right along the guide rod 12 under the pulling of the connecting rod 8, so that the two groups of supporting plates 1402 can be stably contacted and clamped from the front and rear sides of the exhaust pipe fitting 7.

[0044] In the disclosed embodiment, the push plate 1307 is provided with three groups of oblique through grooves which pass through from front to back, and the oblique through grooves are distributed in a circular array around the central axis of the push plate 1307. The inner support frame 1306 with a cylindrical structure is embedded in the oblique through grooves of the push plate 1307. During the rotation of the push plate 1307, the oblique through grooves are used to push the inner support frame 1306 with a cylindrical structure, so that the three groups of inner support frames 1306 move along the three groups of through grooves of the guide plate 1305 respectively, and the three groups of inner support frames 1306 move and extend outward in a synchronous manner, and the inner support frame 1306 clamps the inner wall of the exhaust pipe 7.

[0045] The specific usage and function of this embodiment are as follows:

[0046] When the utility model is clamping the exhaust pipe with the clamp, the turntable frame 5 is first manually rotated, and the turntable frame 5 drives the bidirectional threaded rod 6 to rotate. Since the positive thread end and the reverse thread end of the outer side surface of the bidirectional threaded rod 6 are respectively meshed and connected in the threaded through holes of the two groups of slide plates 10, the bidirectional threaded rod 6 drives the clamping rotating devices 13 carried on the upper sides of the two groups of slide plates 10 to move left and right oppositely, and the spacing between the two groups of clamping rotating devices 13 is changed according to the length of the exhaust pipe fitting 7, and then the knob 1403 is manually turned to drive the threaded column 1404 to rotate, and the threaded column 1404 drives the supporting plate 1402 to adjust the height position of the supporting plate 1402 according to the pipe diameter of the exhaust pipe fitting 7, ensuring that the V-shaped structure of the supporting plate 1402 can fit and contact the exhaust pipe The outer side of the exhaust pipe fitting 7 is then respectively nested at the left and right ends of the exhaust pipe fitting 7 on the outer sides of the three groups of inner support frames 1306 of the two groups of clamping rotating devices 13, and the knobs 1314 of the two groups of clamping rotating devices 13 are manually rotated, and the knobs 1314 drive the worm 1313 to rotate, and the worm 1313 drives the worm wheel 1310 meshingly connected to the outer side to rotate, and the worm wheel 1310 drives the push plate 1307 welded to the front side of the transmission rod 1316 to rotate, and at this time, the inner walls of the three groups of oblique through grooves of the push plate 1307 squeeze and push the inner support frame 1306, so that the rectangular protrusions on the rear sides of the three groups of inner support frames 1306 move along the three groups of through grooves of the guide plate 1305 respectively, until the three groups of inner support frames 1306 simultaneously contact the inner side wall of the tube body of the exhaust pipe fitting 7, so that the inner The support frame 1306 performs internal support and clamping work on the exhaust pipe fitting 7, and finally the telescopic rod of the cylinder 4 drives the push-pull block 9 to move to the left, and the push-pull block 9 respectively pulls the two groups of moving frames 1401 to move forward and backward along the guide rod 12 through the two groups of connecting rods 8 hinged on the left and right sides, until the two groups of V-shaped support plates 1402 contact the outer side of the exhaust pipe fitting 7 for support and clamping to prevent the exhaust pipe fitting 7 from deflecting due to the vibration of the hole cutting. When the hole cutting on one side of the exhaust pipe fitting 7 is completed, the telescopic rod of the cylinder 4 drives the push-pull block 9 to move to the right, and the push-pull block 9 respectively pulls the two groups of moving frames 1401 to move forward and backward along the guide rod 12 through the two groups of connecting rods 8 hinged on the left and right sides. 402 disengages from the exhaust pipe fitting 7, and then the motor 1309 drives the large gear 1308 meshingly connected to the outer side of the small gear 1315 to rotate, and the large gear 1308 drives the rotating disk 1303 welded to the front side to rotate, and the rotating disk 1303 drives the guide disk 1305 to rotate through the pillar 1304, and the guide disk 1305 drives the three groups of inner support frames 1306 embedded in the three groups of through grooves to rotate around the central axis of the guide disk 1305, and the three groups of inner support frames 1306 drive the exhaust pipe fitting 7 clamped by the inner support to rotate a certain angle, and then the cylinder 4 drives the supporting plate 1402 of the supporting device 14 to contact and support the exhaust pipe fitting 7 through the connecting rod 8 again, completing the rotation face-changing hole cutting processing work of the exhaust pipe fitting 7 in the inner support clamping state.

[0047] The installation, connection or setting methods of all the above components are common mechanical methods, such as welding, threaded connection, screw connection, etc., and the specific structures, models and coefficient indicators of all its components are its own technology, as long as it can achieve its beneficial effects, it can be implemented. The cylinder 4 and motor 1309 used above are common components on the market. When they are bought back for use, they can be used by simply connecting them according to the instruction manual purchased together, so they will not be repeated here.

[0048] The technical solution of the present invention is not limited to the scope of the embodiments of the present invention, and the technical contents not described in detail in the present invention are all well-known technologies.

Claims

1. A fixture for processing an exhaust pipe, comprising a base plate (1); columns (2) are welded to the four corners of the upper side of the base plate (1); a bearing plate (11) is welded to the top of the column (2); a lifting ring (3) is installed on the upper side of the bearing plate (11); the bearing plate (11) is welded to a guide rod (12); a cylinder (4) is connected to the left side of the bearing plate (11) by bolts; a push-pull block (9) is installed at the right end of the telescopic rod of the cylinder (4); a connecting rod (8) is hinged to the front side and the rear side of the push-pull block (9); the characteristics are: It also includes a bidirectional threaded rod (6), an exhaust pipe (7), a clamping rotating device (13) and a supporting device (14); a turntable frame (5) is installed at the right end of the bidirectional threaded rod (6); the number of the clamping rotating devices (13) is two groups, and each group of the clamping rotating devices (13) includes a base frame (1301), a fixed frame (1302), a rotating disk (1303), a support (1304), a guide disk (1305), an inner support frame (1306), a push disk (1307), a large gear (1308), an electric motor (1309), a worm gear (1310), a clamping bolt (1311), a clamping nut (1312), a worm (1313), and a screw (1314). 3), a knob (1314), a pinion (1315) and a transmission rod (1316); the bottom end of the base frame (1301) is connected to the slide plate (10) by bolts, the front side of the base frame (1301) is connected to the fixing frame (1302) by clamping bolts (1311) and clamping nuts (1312), the rear side of the fixing frame (1302) is installed with a motor (1309), the motor shaft of the motor (1309) is installed with a pinion (1315), the outer side of the pinion (1315) is meshedly connected with a large gear (1308), the front side of the large gear (1308) is welded to a rotating disk (1303), the rotating disk (1303) is connected to the rotating disk (1303), and the rotating disk (1309) is connected to the rotating disk (1303) by welding. The front side of the support frame (1303) is welded to a support (1304), the front end of the support frame (1304) is welded to a guide plate (1305), the rear side of the guide plate (1305) is rotatably connected to a worm (1313), the outer side of the worm (1313) is meshingly connected to a worm wheel (1310), the front end of the worm wheel (1310) is welded to a transmission rod (1316), the front end of the transmission rod (1316) is welded to a push plate (1307), and the push plate (1307) is slidably connected to the inner support frame (1306); the inner support frame (1306) is a cylindrical structure, the rear end of the inner support frame (1306) is provided with a rectangular protrusion, and the inner support frame (1306) is provided with a plurality of protrusions. 6) is slidably connected to the guide plate (1305); the front side of the fixed frame (1302) is rotatably connected to a large gear (1308); the number of the supporting devices (14) is two groups, and the supporting devices (14) include a movable frame (1401), a supporting plate (1402), a knob (1403) and a threaded column (1404); the lower side of the movable frame (1401) is hinged with a connecting rod (8), the upper side of the movable frame (1401) is rotatably connected to the threaded column (1404), and the top of the threaded column (1404) is equipped with a knob (1403); the outer side of the threaded column (1404) is meshingly connected to the supporting plate (1402).

2. A fixture for exhaust pipe processing as claimed in claim 1, characterized in that: The number of the slide plates (10) is two groups, and the slide plates (10) are symmetrically distributed on the left and right. Each group of slide plates (10) is provided with threaded through holes that penetrate the left and right sides. The positive threaded end of the outer side surface of the bidirectional threaded rod (6) is meshedly connected in the threaded through hole of the left slide plate (10), and the reverse threaded end of the outer side surface of the bidirectional threaded rod (6) is meshedly connected in the threaded through hole of the right slide plate (10).

3. A fixture for exhaust pipe processing as claimed in claim 1, characterized in that: The support plate (1402) is of a V-shaped structure. A convex plate is provided on the rear side of the support plate (1402). A threaded through hole extending vertically is provided at the center of the convex plate. The threaded column (1404) is meshedly connected in the convex plate threaded through hole of the support plate (1402).

4. A fixture for exhaust pipe processing as claimed in claim 1, characterized in that: A through hole is provided at the center of the guide plate (1305), a transmission rod (1316) is inserted into the center through hole of the guide plate (1305), three groups of through grooves are provided outside the center through hole of the guide plate (1305), the through grooves of the guide plate (1305) are distributed in a circular array around the center through hole of the push plate (1307), and the rectangular protrusions of the three groups of inner support frames (1306) are respectively embedded in the three groups of through grooves of the guide plate (1305).

5. A fixture for exhaust pipe processing as claimed in claim 1, characterized in that: The number of the movable frames (1401) is two groups. The movable frames (1401) are of an L-shaped folding plate structure. A through groove is provided on the front side of the L-shaped folding plate of the movable frame (1401). A convex plate on the rear side of the supporting plate (1402) is inserted into the through groove of the movable frame (1401). A convex block is provided on the lower side of the movable frame (1401). A through hole is provided on the front side of the convex block. The guide rod (12) is inserted into the through hole of the convex block of the movable frame (1401).

6. A fixture for exhaust pipe processing as claimed in claim 1, characterized in that: The push plate (1307) is provided with three groups of oblique through grooves extending front to back, the oblique through grooves being distributed in a circular array around the central axis of the push plate (1307), and the inner support frame (1306) of a cylindrical structure is embedded in the oblique through grooves of the push plate (1307).

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