A continuous punching forming apparatus for an inner tube of a muffler

Abstract

The application provides a continuous punching forming equipment for an inner tube of a muffler, and belongs to the technical field of stamping. The equipment comprises a rack, a stamping assembly and a feeding assembly installed on the rack. The feeding assembly comprises a feeding motor and a feeding clamp. The feeding motor drives the feeding clamp to slide close to the stamping assembly and complete feeding. The stamping assembly comprises a stamping cylinder. An upper die is installed at the telescopic end of the stamping cylinder. A lower die is fixedly installed on the rack. An edge cutting knife and a plurality of pin holes are arranged on the lower surface of the upper die. An elastic pressing pad is arranged in the gap between the edge cutting knife and the pin holes. The thickness of the elastic pressing pad is greater than the height of the edge cutting knife and the pin holes. According to the design requirements of the inner tube of the muffler, the edge cutting knife and the pin holes are integrated to form a die. One-time stamping forming is realized by using the die, so that the influence caused by the accumulation of slight displacement can be avoided. In addition, the stainless steel plate is fixed by the feeding clamp and the elastic pressing pad, and then stamping forming is carried out, so that relative displacement can be further avoided, and the stamping effect is ensured.

Description

Technical Field

[0001] This invention belongs to the field of stamping technology, and in particular relates to a continuous punching forming device for the inner tube of a muffler. Background Technology

[0002] The inner tube of a car muffler is an important component of the muffler system, and it is constructed using a specific porous structure (such as the attached...). Figure 17 As shown in the diagram, sound waves are reflected and interfered with during propagation, thereby attenuating sound energy and achieving noise reduction. Therefore, the porous structure of the muffler's inner tube is one of the key components for its noise reduction function. The muffler's inner tube has multiple small holes, the number and size of which are precisely designed to ensure optimal noise reduction within a specific frequency range. These holes are evenly distributed on the tube wall to guide exhaust gas through and diffuse and attenuate sound waves.

[0003] Currently, automotive muffler inner tubes are manufactured through processes such as continuous punching, rolling, welding, and cutting of stainless steel plates. However, existing stamping equipment lacks stability during punching. At the moment of contact between the punch and the stainless steel plate, a slight relative displacement occurs due to the collision. For automotive muffler inner tubes that require continuous punching, this slight displacement gradually accumulates during the punching process, severely affecting the layout of the circular holes in the final formed inner tube, and consequently impacting the noise reduction effect. Summary of the Invention

[0004] To address the aforementioned problems in existing technologies, this invention provides a continuous punching and forming device for muffler inner tubes, comprising a frame on which a stamping assembly is mounted. A feeding assembly for feeding material to the stamping assembly is provided on one side of the frame. The feeding assembly includes a feeding motor and a feeding clamp, the feeding clamp being slidably mounted on the frame. The feeding motor is fixedly mounted on the frame and drives the feeding clamp to slide closer to or away from the stamping assembly. The stamping assembly includes a stamping cylinder fixedly mounted on the frame. An upper die is fixedly mounted on the telescopic end of the stamping cylinder. A lower die is fixedly mounted on the frame directly below the upper die. The lower surface of the upper die is provided with a trimming blade matching the size of the target muffler inner tube and several pins. An elastic pressure pad is provided in the gap between the trimming blade and the pins on the lower surface of the upper die, the thickness of which is greater than the height of the trimming blade and the pins.

[0005] The frame is fixedly provided with several vertically extending guide optical shafts, and the upper mold is fixedly installed with several linear bearings that correspond one-to-one with the guide optical shafts. The upper mold is slidably connected to the guide optical shafts through the linear bearings, and several structural reinforcing corner plates are fixedly provided on the upper surface of the upper mold.

[0006] The trimming blade has a rectangular structure, with right-angled blades extending outward at each of the four apex corners. The two sides of the blades are collinear with the two sides of the corresponding apex corners. A bending table is also provided on the outer side of the trimming blade.

[0007] The feeding assembly further includes a transmission structure. The frame is provided with several rubber strip grooves. The transmission structure includes a chain sleeve fixedly installed in the rubber strip groove. A transmission chain is slidably embedded in the chain sleeve. The transmission chain is a closed-loop chain, and both ends of the transmission chain extend outside the chain sleeve. A reversing gear is engaged at one end of the transmission chain, and the other end of the transmission chain is engaged with a planetary gear box. The power output end of the feeding motor is driven and connected to the planetary gear box. The closed-loop chain and the feeding clamp are fixedly connected.

[0008] The transmission structure has two sets, and the two sets of transmission structures are located on both sides of the frame. The feeding motor is a double-headed motor and its two power output ends are respectively connected to the planetary gearboxes of the two sets of transmission structures. The reversing gears of the two sets of transmission structures are fixedly connected to each other through synchronous shafts. The feeding clamps connected to the two sets of transmission structures are symmetrically arranged.

[0009] The frame is provided with a feeding chute, and the feeding clamp includes a slide seat that is slidably installed in the feeding chute. A fixing pin for fixed connection with the transmission chain is fixedly provided on one side of the slide seat. A telescopic chute is provided on the upper surface of the slide seat. A lower clamping plate is slidably installed on the upper surface of the slide seat through the cooperation of the telescopic chute and the telescopic slider. An upper clamping plate is rotatably installed on one end of the upper surface of the lower clamping plate through a rotating shaft. A torsion spring is sleeved on the rotating shaft. The two ends of the torsion spring abut against the lower clamping plate and the upper clamping plate respectively. In its natural extended state, the torsion spring supports the lower clamping plate and the upper clamping plate to move away from each other. The sides of the lower clamping plate and the upper clamping plate that are close to each other are provided with mutually cooperating clamping pads. The lower clamping plate also has an upwardly extending guide post at the end where the rotating shaft is located.

[0010] The frame is also equipped with a guide pressing assembly for pressing the feeding clamp. The guide pressing assembly includes a guide seat and several pressing rollers. The guide seat is provided with a guide groove that slides with the guide post. The guide seat includes a telescopic seat and a translational seat. The guide groove of the translational seat is arranged in a straight line on one side near the edge of the frame. The two ends of the guide groove of the telescopic seat are close to the edge of the frame, and the middle part of the guide groove of the telescopic seat is closer to the middle of the frame than the two ends. The two ends and the middle part of the guide groove of the telescopic seat are connected by an inclined section. When the guide post of the feeding clamp slides to the middle part of the guide groove of the telescopic seat, the lower clamp and the upper clamp extend out of the feeding chute towards the middle of the frame. The pressing rollers are rotatably mounted on the guide seat along the sliding direction of the feeding clamp and are located on the side of the guide seat near the middle of the frame. When the feeding clamp moves below the pressing rollers, the upper clamp can be pressed by the pressing rollers to fit against the lower clamp.

[0011] The frame is also fixedly equipped with a support roller for supporting the stainless steel plate, and a limiting decorative plate for blocking the translation seat and the corresponding feeding chute of the translation seat.

[0012] The beneficial effects of this invention are as follows:

[0013] 1. Based on the design requirements of the muffler's inner tube, the trimming blade and several perforating needles are integrated into a mold. Using this mold for a single stamping process avoids the impact of accumulated slight displacement. Furthermore, by fixing the stainless steel plate with a feeding clamp and elastic pads before stamping, relative displacement can be further prevented, ensuring the stamping effect.

[0014] 2. Through the cooperation of the feeding motor and the feeding clamp, stainless steel sheets can be pulled out from the stainless steel coil and continuously fed to the stamping assembly to achieve continuous stamping and improve production efficiency. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a continuous punching and forming equipment for the inner tube of a muffler.

[0016] Figure 2 yes Figure 1 Enlarged view of point A.

[0017] Figure 3 This is a schematic diagram of the planar structure of the feed end of a continuous punching and forming equipment for the inner tube of a muffler.

[0018] Figure 4 yes Figure 3 Enlarged view of point B.

[0019] Figure 5 This is a schematic diagram of the planar structure of the discharge end of a continuous punching and forming equipment for the inner tube of a muffler.

[0020] Figure 6 This is a schematic diagram of the exploded structure of the upper mold and the elastic pressure pad.

[0021] Figure 7 This is a schematic diagram of the three-dimensional structure of the upper mold.

[0022] Figure 8 yes Figure 7 Enlarged view of point C.

[0023] Figure 9 This is a three-dimensional structural diagram of the feeding component.

[0024] Figure 10 This is a three-dimensional structural diagram of the feeding component from another angle.

[0025] Figure 11 yes Figure 10 Enlarged view of point D.

[0026] Figure 12 This is a three-dimensional structural diagram of the guide pressing component.

[0027] Figure 13 yes Figure 12 Enlarged view of point E.

[0028] Figure 14 This is a 3D structural diagram of the feeding clamp, showing its extended position.

[0029] Figure 15 This is a 3D structural diagram of the feed clamp in its retracted state.

[0030] Figure 16 This is a schematic diagram of the exploded structure of the feed clamp.

[0031] Figure 17 This is a three-dimensional structural diagram of the inner tube of the muffler. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0033] As attached Figure 1-16 The continuous punching and forming equipment for the inner tube of a muffler shown includes a frame 1, on which a stamping assembly 2 is mounted. The frame 1 has a feeding assembly 3 for feeding material to the stamping assembly 2 on one side, and a discharge port 4 on the other side of the stamping assembly 2.

[0034] A gantry frame is installed at the position corresponding to the installation of the stamping assembly 2 on the frame 1. The stamping assembly 2 includes a stamping cylinder 5 fixedly installed on the upper surface of the gantry frame. The telescopic end of the stamping cylinder 5 extends downward through the gantry frame and is fixedly installed with an upper die 6. A lower die 7 is fixedly installed on the frame 1 directly below the upper die 6. The lower surface of the upper die 6 is provided with a trimming blade 8 matching the size of the inner tube of the target muffler and several perforated pins 9. The trimming blade 8 has a rectangular structure, and each of the four vertices of the rectangular structure has an outwardly extending right-angled point. Angle blade 10 is provided, with its two sides and the corresponding two sides of the apex angle arranged collinearly. A bending table 11 is also provided on the outer side of the trimming blade 8. The pin 9 is provided inside the trimming blade 8. An elastic pad 12 is provided on the lower surface of the upper die 6 in the gap between the trimming blade 8 and the pin 9. The elastic pad 12 includes a fixed mounting part and an elastic part. The elastic pad 12 is fixedly connected to the lower surface of the upper die 6 through the fixed mounting part. The thickness of the elastic pad 12 is greater than the height of the trimming blade 8 and the pin 9, so that the elastic part can extend downward beyond the trimming blade 8 and the pin 9.

[0035] Four vertically extending guide optical shafts 13 are fixedly installed on the frame 1. The four guide optical shafts 13 correspond to the four apex corners of the upper die 6. At each of the four apex corners of the upper die 6, a linear bearing 14 corresponding to the guide optical shaft 13 is fixedly installed. The upper die 6 is slidably connected to the guide optical shafts 13 through the linear bearings 14, which can improve the sliding stability of the upper die 6 and prevent the upper die 6 from shifting during the stamping process. Four structural reinforcing corner plates 15 are fixedly installed on the upper surface of the upper die 6. The four structural reinforcing corner plates 15 are circumferentially distributed and each plate is 90° apart, which can improve the structural strength of the upper die 6. The lower die 7 is provided with matching holes at the corresponding trimming cutter 8 and pin 9 to complete the stamping operation.

[0036] The feeding assembly 3 includes a feeding motor 16, a feeding clamp 17, and a transmission structure. The frame 1 has a groove at the location corresponding to the installation of the feeding assembly 3. Five support rollers 18 for supporting stainless steel plates are fixedly installed in the groove, with the extension direction of the support rollers 18 perpendicular to the feeding direction. The frame 1 has two feeding chutes 19 on each side wall of the groove, arranged vertically and parallel to each other. Each feeding chute 19 has a parallel rubber strip groove 20 on one side. The transmission structure includes a chain sleeve 21 fixedly installed in the rubber strip groove 20. A transmission chain is slidably embedded in the chain sleeve 21. Starting from one end of the first chain sleeve 21, the chain extends to the other end of the first chain sleeve 21, then wraps around to one end of the second chain sleeve 21 on the same side, then crosses over the second chain sleeve 21, extends out, and then wraps back to the first chain sleeve 21, forming a closed-loop chain. Both ends of the transmission chain extend outside the chain sleeves 21. One end of the transmission chain is fitted with a reversing gear 22, and the other end is fitted to a planetary gearbox 23. The two chain sleeves 21, the transmission chain, the reversing gear 22, and the planetary gearbox 23, located on the same side of the groove, form a transmission structure. There are two transmission structures in total, located on opposite sides of the frame 1. The feeding motor 16 is a dual-head servo motor fixedly installed in the groove. The two power output ends of the feeding motor 16 are respectively connected to the planetary gearboxes 23 of the two transmission structures. The reversing gears 22 of the two transmission structures are fixedly connected to each other via synchronous shafts, allowing the two reversing gears 22 to rotate synchronously.

[0037] The feeding clamp 17 is slidably mounted on the feeding groove 19 of the frame 1. The feeding clamps 17 on both sides of the frame 1 are symmetrically arranged and connected to two sets of transmission structures respectively. The feeding clamp 17 is driven by the feeding motor 16 to slide closer to or away from the stamping assembly 2.

[0038] In a preferred embodiment, the feeding clamp 17 includes a slide block 24 slidably mounted within a feeding chute 19. A fixing pin 25 for fixed connection with a transmission chain is fixedly provided on one side of the slide block 24. The fixing pin 25 is the same size as the pin of the transmission chain. The fixing pin 25 and the chain connecting buckle are fixedly connected to the transmission chain via a pin-type connection, and the connection is reinforced by welding. The upper surface of the slide block 24 is provided with a "T"-shaped telescopic groove 26. The upper surface of the slide block 24 is connected to the "T"-shaped telescopic slider 27 via the telescopic groove 26. A lower clamping plate 28 is slidably mounted. An upper clamping plate 29 is mounted on one end of the upper surface of the lower clamping plate 28 via a rotating shaft. A torsion spring 30 is sleeved on the rotating shaft. The two ends of the torsion spring 30 abut against the lower clamping plate 28 and the upper clamping plate 29 respectively. In its naturally extended state, the torsion spring 30 supports the lower clamping plate 28 and the upper clamping plate 29 to move away from each other. The sides of the lower clamping plate 28 and the upper clamping plate 29 that are close to each other are provided with mutually cooperating clamping pads 31. The lower clamping plate 28 is also provided with an upwardly extending guide post 32 at the end where the rotating shaft is located.

[0039] The frame 1 is also equipped with a guide pressing assembly for pressing the feeding clamp 17. The guide pressing assembly includes a guide seat 33 and several pressing rollers 34. The guide seat 33 is provided with a guide groove 35 that slides with the guide post 32. The guide seat 33 includes a telescopic seat 33a and a translational seat 33b. The telescopic seat 33a is installed in the two upper feeding chutes 19, and the translational seat 33b is installed in the two lower feeding chutes 19. The guide groove 35 of the translational seat 33b is arranged in a straight line on one side near the edge of the frame 1. The two ends of the guide groove 35 of the telescopic seat 33a are close to the edge of the frame 1, and the middle part of the guide groove 35 of the telescopic seat 33a is closer to the middle part of the frame 1 than the two ends. The two ends and the middle part of the guide groove 35 of the telescopic seat 33a are closer to the middle part of the frame 1. When the guide post 32 of the feeding clamp 17 slides to the middle of the guide groove 35 of the telescopic seat 33a via the inclined section 35a, the lower clamp 28 and the upper clamp 29 extend out of the feeding chute 19 towards the middle of the frame 1. The pressing roller 34 is rotatably mounted on the guide seat 33 along the sliding direction of the feeding clamp 17 and is located on the side of the guide seat 33 near the middle of the frame 1. When the feeding clamp 17 moves below the pressing roller 34, the upper clamp 29 can be pressed by the pressing roller 34 to fit against the lower clamp 28. The side walls on both sides of the groove of the frame 1 are also fixedly provided with limiting decorative plates 36 for blocking the translation seat 33b and the corresponding feeding chute 19 of the translation seat 33b. The limiting decorative plates 36 can also prevent the lower clamp 28 and the upper clamp 29 from extending out of the feeding chute 19.

[0040] The device provided in this embodiment is used in conjunction with stainless steel coils. The stainless steel coils are rotatably mounted on one side of the feeding end of the device. The stainless steel plate is manually pulled out to the nearest set of feeding clamps 17, and the stainless steel plate is clamped by the set of feeding clamps 17. Then the feeding motor 16 is started. The feeding motor 16 drives the feeding clamps 17 through the transmission structure to push and pull the stainless steel plate to the stamping assembly 2 for stamping.

[0041] During the feeding process, the feeding motor 16 drives the feeding clamp 17 from the lower feeding chute 19 to the upper feeding chute 19 via the transmission chain. At the same time, the guide post 32 of the feeding clamp 17 inserts into the guide groove 35 of the upper guide pressing assembly. In practical applications, the width of the opening of the guide groove 35 can be greater than the diameter of the guide post 32, forming a trumpet-shaped structure with one side larger than the other, making it easier for the guide post 32 to enter the guide groove 35. As the feeding clamp 17 continues to move, the guide post 32, under the action of the guide groove 35, drives the lower clamping plate 28 and the upper clamping plate 29 of the feeding clamp 17 to extend outward from the feeding chute 19. The lower clamping plate 28 is located below the stainless steel plate, and the upper clamping plate 29 is located above the stainless steel plate. As the feeding clamp 17 continues to move, the upper clamping plate 29 will contact the pressing roller 34 and be pressed by the pressing roller 34 against the lower clamping plate 28, thereby clamping the stainless steel plate. At this time, the stainless steel plate will move synchronously.

[0042] When the feeding clamp 17 moves out of the range of the pressing roller 34, the upper clamp 29 automatically opens under the action of the torsion spring 30, and the guide post 32 drives the lower clamp 28 and the upper clamp 29 to retract into the feeding chute 19 under the action of the guide groove 35. Then, the feeding clamp 17 returns to the lower feeding chute 19 and prepares to clamp the stainless steel plate for the next time. According to actual needs, multiple sets of feeding clamps 17 are set in the feeding chute 19, which can realize uninterrupted clamping and feeding. Even during the stamping process, the stainless steel plate is clamped and fixed by multiple feeding clamps 17, which can reduce the displacement of the stainless steel plate during the stamping process to a certain extent and improve the stamping accuracy.

[0043] During the stamping process, the stamping cylinder 5 drives the upper die 6 to descend. The elastic pressure pad 12 first contacts and presses the stainless steel plate to prevent displacement. Then, the trimming blade 8 and the hole needle 9 simultaneously contact the stainless steel plate to complete the punching and cutting. Since the trimming blade 8 is equipped with a corner blade 10 and a bending table 11, while stamping out the blank of the inner tube, the corner blade 10 will cut the cut edge of the stainless steel plate material again. Then, the bending table 11 will bend the cut edge of the stainless steel plate material downward, forming a downward bending structure, which increases the contact area between the stainless steel plate material and the blank of the inner tube. Then, when the feeding clamp 17 pushes the stainless steel plate, the stainless steel plate material will drive the blank of the inner tube to move forward, leave the stamping assembly 2 and fall into the discharge port 4 to complete the discharge.

[0044] In practical applications, a negative pressure dust collection structure can be set in the lower mold 7 as needed to adsorb and recycle waste generated during the stamping process.

[0045] The above-described embodiments are merely one implementation of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A continuous punching and forming equipment for the inner tube of a muffler, comprising a frame (1) and a stamping assembly (2) mounted on the frame (1), characterized in that, The frame (1) is provided with a feeding assembly (3) for feeding material to the stamping assembly (2) on one side. The feeding assembly (3) includes a feeding motor (16) and a feeding clamp (17). The feeding clamp (17) is slidably mounted on the frame (1). The feeding motor (16) is fixedly mounted on the frame (1) and drives the feeding clamp (17) to slide closer to or away from the stamping assembly (2). The stamping assembly (2) includes a stamping cylinder (5) fixedly mounted on the frame (1). An upper die (6) is fixedly mounted on the telescopic end of the stamping cylinder (5). A lower die (7) is fixedly mounted on the frame (1) directly below the corresponding upper die (6). The lower surface of the upper die (6) is provided with a trimming knife (8) that matches the size of the inner tube of the target muffler and several pin holes (9). The lower surface of the upper die (6) is provided with a trimming knife (8) and several pin holes (9) that match the size of the inner tube of the target muffler. An elastic pad (12) is provided in the gap between the trimmer (8) and the pin (9). The thickness of the elastic pad (12) is greater than the height of the trimmer (8) and the pin (9). Several vertically extending guide shafts (13) are fixedly provided on the frame (1). Several linear bearings (14) corresponding to the guide shafts (13) are fixedly installed on the upper mold (6). The upper mold (6) is slidably connected to the guide shafts (13) through the linear bearings (14). Several structural reinforcing corner plates (15) are fixedly provided on the upper surface of the upper mold (6). The trimmer (8) is a rectangular structure. The trimmer (8) has right-angled corner blades (10) extending outward at the four corners of the rectangular structure. The two sides of the corner blades (10) are collinear with the two sides of the corresponding corners. A bending table (11) is also provided on the outside of the trimmer (8).

2. The continuous punching and forming equipment for the inner tube of a muffler according to claim 1, characterized in that, The feeding assembly (3) also includes a transmission structure. The frame (1) is provided with several rubber strip grooves (20). The transmission structure includes a chain sleeve (21) fixedly installed in the rubber strip groove (20). A transmission chain is slidably embedded in the chain sleeve (21). The transmission chain is a closed-loop chain, and both ends of the transmission chain extend out of the chain sleeve (21). A reversing gear (22) is engaged at one end of the transmission chain, and the other end of the transmission chain is engaged with a planetary gear box (23). The power output end of the feeding motor (16) is driven to the planetary gear box (23). The closed-loop chain and the feeding clamp (17) are fixedly connected.

3. The continuous punching and forming equipment for the inner tube of a muffler according to claim 2, characterized in that, The transmission structure has two sets, and the two sets of transmission structures are located on both sides of the frame (1). The feeding motor (16) is a double-headed motor and its two power output ends are respectively connected to the planetary gearbox (23) of the two sets of transmission structures. The reversing gears (22) of the two sets of transmission structures are fixedly connected to each other through synchronous shafts. The feeding clamps (17) connected to the two sets of transmission structures are symmetrically arranged.

4. The continuous punching and forming equipment for the inner tube of a muffler according to claim 3, characterized in that, The frame (1) is provided with a feeding chute (19). The feeding clamp (17) includes a slide seat (24) that is slidably installed in the feeding chute (19). A fixing pin (25) for fixed connection with the transmission chain is fixedly provided on one side of the slide seat (24). A telescopic chute (26) is provided on the upper surface of the slide seat (24). A lower clamping plate (28) is slidably installed on the upper surface of the slide seat (24) through the cooperation of the telescopic chute (26) and the telescopic slider (27). One end of the upper surface of the lower clamping plate (28) is connected by a rotating shaft. The upper clamping plate (29) is mounted on the rotating shaft, and a torsion spring (30) is sleeved on the rotating shaft. The two ends of the torsion spring (30) abut against the lower clamping plate (28) and the upper clamping plate (29) respectively. In the natural extended state, the torsion spring (30) supports the lower clamping plate (28) and the upper clamping plate (29) to move away from each other. The sides of the lower clamping plate (28) and the upper clamping plate (29) that are close to each other are provided with clamping pads (31) that cooperate with each other. The lower clamping plate (28) is also provided with an upwardly extending guide post (32) at the end where the rotating shaft is located.

5. The continuous punching and forming equipment for the inner tube of a muffler according to claim 4, characterized in that, The frame (1) is also provided with a guide pressing assembly for pressing the feeding clamp (17). The guide pressing assembly includes a guide seat (33) and several pressing rollers (34). The guide seat (33) is provided with a guide groove (35) that slides with the guide post (32). The guide seat (33) includes a telescopic seat (33a) and a translation seat (33b). The guide groove (35) of the translation seat (33b) is arranged in a straight line on one side near the edge of the frame (1). The two ends of the guide groove (35) of the telescopic seat (33a) are close to the edge of the frame (1), and the middle part of the guide groove (35) of the telescopic seat (33a) is closer to the middle part of the frame (1) than the two ends. The two ends and the middle of the guide groove (35) of the telescopic seat (33a) are connected by an inclined section (35a). When the guide post (32) of the feeding clamp (17) slides to the middle of the guide groove (35) of the telescopic seat (33a), the lower clamp (28) and the upper clamp (29) extend out of the feeding chute (19) towards the middle of the frame (1). The pressing roller (34) is rotatably mounted on the guide seat (33) along the sliding direction of the feeding clamp (17) and is located on the side of the guide seat (33) near the middle of the frame (1). When the feeding clamp (17) moves to the bottom of the pressing roller (34), the upper clamp (29) can be pressed by the pressing roller (34) to fit against the lower clamp (28).

6. The continuous punching and forming equipment for the inner tube of a muffler according to claim 5, characterized in that, The frame (1) is also fixedly provided with a support roller (18) for supporting the stainless steel plate, and a limiting decorative plate (36) for blocking the translation seat (33b) and the corresponding feeding chute (19) of the translation seat (33b).

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