Continuous punching forming equipment for inner pipe of silencer

Abstract

The invention provides silencer inner pipe continuous punching forming equipment, and belongs to the technical field of stamping, the silencer inner pipe continuous punching forming equipment comprises a rack, a stamping assembly and a feeding assembly are installed on the rack, the feeding assembly comprises a feeding motor and a feeding clamp, and the feeding motor drives the feeding clamp to slide to be close to the stamping assembly and complete feeding; the stamping assembly comprises a stamping air cylinder, an upper die is installed at the telescopic end of the stamping air cylinder, a lower die is fixedly installed on the machine frame, an edge cutting knife and a plurality of hole needles are arranged on the lower surface of the upper die, an elastic pressing pad is arranged in a gap between the edge cutting knife and the hole needles, and the thickness of the elastic pressing pad is larger than the height of the edge cutting knife and the height of the hole needles. The edge cutter and the multiple hole needles are integrated to be manufactured into the die, one-time stamping forming is carried out through the die, and the influence caused by accumulation of slight displacement can be avoided. In addition, the stainless steel plate is fixed through the feeding clamp and the elastic pressing pad, then stamping forming is conducted, relative displacement can be further avoided, and the stamping effect is guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of stamping technology, and in particular relates to a continuous punching forming device for an inner pipe of a muffler. Background Art

[0002] The inner tube of the automobile muffler is an important part of the muffler system. Fig.17 As shown in the figure, the sound waves are reflected and interfered during propagation, thereby attenuating the sound energy and achieving the purpose of noise reduction. Therefore, the porous structure of the muffler inner tube is one of the key parts to achieve its muffler function. The muffler inner tube has multiple small holes. The number and size of the holes are precisely designed to ensure the best muffler effect within a specific frequency range. These holes are evenly distributed on the tube wall to guide the exhaust gas through and diffuse and attenuate the sound waves.

[0003] At present, the inner tube of automobile muffler is made by continuous punching, rolling, welding and cutting of stainless steel plate. However, the existing stamping equipment is not stable enough when punching. At the moment when the punch needle and the stainless steel plate come into contact, the punch needle and the stainless steel plate will have a slight relative displacement due to the collision. For the inner tube of automobile muffler that needs continuous punching, the slight displacement will gradually accumulate during the continuous punching process, which will seriously affect the layout of the circular holes when the inner tube of automobile muffler is finally formed, and then affect the muffler effect. Summary of the invention

[0004] Based on the above-mentioned problems in the prior art, the present invention provides a continuous punching and forming device for an inner pipe of a muffler, comprising a frame, on which a stamping assembly is installed, and a feeding assembly for feeding material to the stamping assembly is provided on one side of the stamping assembly of the frame, and the feeding assembly comprises a feeding motor and a feeding clamp, and the feeding clamp is slidably installed on the frame, and the feeding motor is fixedly installed on the frame and drives the feeding clamp to slide close to or away from the stamping assembly; the stamping assembly comprises a stamping cylinder fixedly installed on the frame, an upper die is fixedly installed on the telescopic end of the stamping cylinder, and a lower die is fixedly installed on the frame directly below the corresponding upper die, and a trimming knife and a plurality of hole needles matching the size of the target muffler inner pipe are provided on the lower surface of the upper die, and an elastic pressure pad is provided on the lower surface of the upper die in the gap between the trimming knife and the hole needle, and the thickness of the elastic pressure pad is greater than the height of the trimming knife and the hole needle.

[0005] Among them, several vertically extending guide light shafts are fixedly arranged on the frame, and several linear bearings corresponding to the guide light shafts are fixedly installed on the upper mold. The upper mold is slidably connected to the guide light shafts through the linear bearings, and several structural reinforcement angle plates are fixedly arranged on the upper surface of the upper mold.

[0006] The trimming knife is a rectangular structure, and is provided with right-angled corner blades extending outward at the four vertices of the rectangular structure. The two sides of the corner blades and the two sides of the corresponding vertices are arranged colinearly, and a bending platform is also arranged on the outside of the trimming knife.

[0007] Among them, the feeding assembly also includes a transmission structure, a plurality of rubber strip grooves are arranged on the frame, the transmission structure includes a chain rubber sleeve fixedly installed in the rubber strip groove, a transmission chain is slidably embedded in the chain rubber sleeve, the transmission chain is a closed-loop chain, and both ends of the transmission chain extend out of the chain rubber sleeve, one end of the transmission chain is meshed with a reversing gear, and the other end of the transmission chain is meshed and connected to a planetary gear box, the power output end of the feeding motor is transmission-connected to the planetary gear box, and the closed-loop chain and the feeding clamp are fixedly connected.

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

[0009] Among them, a feeding slide is provided on the frame, and the feeding clamp includes a slide seat slidably installed in the feeding slide slot, a fixing needle for fixed connection with the transmission chain is fixedly provided on one side of the slide seat, and a telescopic slide is provided on the upper surface of the slide seat, and a lower clamping plate is slidably installed on the upper surface of the slide seat through the cooperation of the telescopic slide slot and the telescopic sliding block, and an upper clamping plate is rotatably installed on one end of the upper surface of the lower clamping plate through a rotating shaft, and a torsion spring is sleeved on the rotating shaft, and the two ends of the torsion spring respectively abut against the lower clamping plate and the upper clamping plate, and the torsion spring supports the lower clamping plate and the upper clamping plate to move away from each other and open in a naturally extended state, and the lower clamping plate and the upper clamping plate are provided with mutually cooperating clamping pads on the sides close to each other, and the lower clamping plate is also provided with a guide column extending upward at the end where the rotating shaft is provided.

[0010] The guide pressing assembly for pressing the feeding clamp is also provided on the frame, and the guide pressing assembly includes a guide seat and a plurality of pressing rollers, and the guide seat is provided with a guide groove that slidably cooperates with the guide column, and the guide seat includes a telescopic seat and a translation seat, and the guide groove of the translation seat is arranged in a straight line on the side close to 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 part of the frame than the two ends, and the two ends and the middle part of the guide groove of the telescopic seat are connected by an inclined section. When the guide column 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 slide groove in the direction of the middle of the frame; the pressing roller is rotatably installed on the guide seat along the sliding direction of the feeding clamp, and is located on the side of the guide seat close to the middle part of the frame. When the feeding clamp moves to the bottom of the pressing roller, the upper clamp can be pressed by the pressing roller to fit with the lower clamp.

[0011] Among them, the frame is also fixedly provided with supporting rollers for supporting the stainless steel plate, and is also fixedly provided with a limiting decorative plate for shielding the translation seat and the feeding chute corresponding to the translation seat.

[0012] The present invention has the beneficial effects:

[0013] 1. According to the design requirements of the inner tube of the muffler, the trimming knife and several hole needles are integrated into a mold, and the mold is used for one-time stamping to avoid the impact caused by the accumulation of slight displacement. In addition, the stainless steel plate is fixed by the feeding clamp and the elastic pressure pad, and then stamped to further avoid relative displacement and ensure the stamping effect.

[0014] 2. Through the cooperation of the feeding motor and the feeding clamp, the stainless steel plate can be pulled out from the stainless steel coil and continuously fed to the stamping assembly to achieve continuous stamping and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a three-dimensional structural schematic diagram of a continuous punching forming device for an inner tube of a muffler.

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

[0017] Figure 3 The present invention is a planar structural schematic diagram of the feeding end of a continuous punching forming device for an inner tube of a muffler.

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

[0019] Figure 5 The present invention is a schematic diagram of the planar structure of the discharge end of a continuous punching and forming device for an inner tube of a muffler.

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

[0021] Figure 7 It 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] Fig. 9 It is a three-dimensional structural schematic diagram of the feeding component.

[0024] Fig.10 It is a three-dimensional structural schematic diagram of the feeding component from another angle.

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

[0026] Fig.12 It is a three-dimensional structural schematic diagram of the guide pressing component.

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

[0028] Fig.14 It is a three-dimensional structural diagram of the feed clamp in the extended state.

[0029] Fig.15 It is a three-dimensional structural diagram of the feed clamp in the retracted state.

[0030] Fig.16 It is a schematic diagram of the exploded structure of the feed clamp.

[0031] Fig.17 It is a schematic diagram of the three-dimensional structure of the inner pipe of the muffler. DETAILED DESCRIPTION

[0032] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

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

[0034] A gantry is provided at a position of the frame 1 corresponding to the installation position of the punching assembly 2. The punching assembly 2 includes a punching cylinder 5 fixedly installed on the upper surface of the gantry. The telescopic end of the punching cylinder 5 extends downward through the gantry and is fixedly installed with an upper die 6. The frame 1 is fixedly installed with a lower die 7 just below the corresponding upper die 6. A trimming knife 8 and a plurality of hole needles 9 matching the size of the target muffler inner pipe are provided on the lower surface of the upper die 6. The trimming knife 8 is a rectangular structure. The trimming knife 8 is provided with right-angled holes extending outward at the four vertex corners of the rectangular structure. A corner blade 10, the two sides of the corner blade 10 and the two sides of the corresponding vertex angle are arranged in a colinear manner, and a bending table 11 is also arranged on the outer side of the trimming knife 8; the hole needle 9 is arranged in the trimming knife 8, and an elastic pressure pad 12 is arranged on the lower surface of the upper mold 6 in the gap between the trimming knife 8 and the hole needle 9. The elastic pressure pad 12 includes a fixed mounting portion and an elastic portion. The elastic pressure pad 12 is fixedly connected to the lower surface of the upper mold 6 through the fixed mounting portion. The thickness of the elastic pressure pad 12 is greater than the height of the trimming knife 8 and the hole needle 9, so that the elastic portion can extend downward to exceed the trimming knife 8 and the hole needle 9.

[0035] Four vertically extending guide light axes 13 are fixedly arranged on the frame 1, and the four guide light axes 13 correspond to the four vertex corners of the upper mold 6 respectively. A linear bearing 14 corresponding to the guide light axis 13 is fixedly installed at each of the four vertex corners of the upper mold 6. The upper mold 6 is slidably connected to the guide light axis 13 through the linear bearing 14, which can improve the sliding stability of the upper mold 6 and avoid displacement of the upper mold 6 during the stamping process. Four structural reinforcement angle plates 15 are fixedly arranged on the upper surface of the upper mold 6. The four structural reinforcement angle plates 15 are distributed in a circle and each plate differs by 90°, which can improve the structural strength of the upper mold 6; the lower mold 7 is provided with matching holes corresponding to the trimming knife 8 and the hole needle 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 is provided with a groove at a position corresponding to the installation position of the feeding assembly 3. Five supporting rollers 18 for supporting the stainless steel plate are fixedly installed in the groove. The extension direction of the supporting rollers 18 is perpendicular to the feeding direction. The frame 1 is provided with two feeding chutes 19 on the side walls on both sides of the groove. The two feeding chutes 19 on each side are arranged up and down and parallel to each other. A rubber strip groove 20 parallel to each other is arranged on one side of each feeding chute 19. The transmission structure includes a chain rubber sleeve 21 fixedly installed in the rubber strip groove 20. A transmission chain is slidably embedded in the chain rubber sleeve 21. The transmission chain Starting from one end of the first chain rubber sleeve 21, it extends to the other end of the chain rubber sleeve 21 and then extends out, then goes around one end of the second chain rubber sleeve 21 on the same side, then crosses the second chain rubber sleeve 21 and then extends out and goes back to the first chain rubber sleeve 21, forming a closed-loop chain and both ends of the transmission chain extend out of the chain rubber sleeve 21, one end of the transmission chain is meshed with a reversing gear 22, and the other end of the transmission chain is meshed with a planetary gear box 23. The two chain rubber sleeves 21, the transmission chain, the reversing gear 22 and the planetary gear box 23 arranged on the same side of the groove form a group of transmission structures, a total of two groups of transmission structures and the two groups of transmission structures are respectively located on both sides of the frame 1. The feeding motor 16 is a double-headed servo motor fixedly installed in the groove, and the two power output ends of the feeding motor 16 are respectively connected to the planetary gear boxes 23 of the two groups of transmission structures, and the reversing gears 22 of the two groups of transmission structures are fixedly connected to each other through a synchronous shaft, so that the two reversing gears 22 can rotate synchronously.

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

[0038] As a preferred embodiment, the feed clamp 17 includes a slide seat 24 slidably installed in the feed chute 19, and a fixing pin 25 for fixing connection with the transmission chain is fixedly arranged on one side of the slide seat 24. The size of the fixing pin 25 is the same as the pin of the transmission chain. The fixing pin 25 and the chain connecting buckle are fixedly connected to the transmission chain by a plug connection method, and the connection position is reinforced by welding; the upper surface of the slide seat 24 is provided with a "T"-shaped telescopic slide groove 26, and the upper surface of the slide seat 24 is connected by the telescopic slide groove 26 and the "T"-shaped telescopic slider 27. A lower clamping plate 28 is installed in cooperation with the sliding, and an upper clamping plate 29 is installed on one end of the upper surface of the lower clamping plate 28 through a rotating shaft. A torsion spring 30 is sleeved on the rotating shaft, and the two ends of the torsion spring 30 respectively abut against the lower clamping plate 28 and the upper clamping plate 29, and the torsion spring 30 supports the lower clamping plate 28 and the upper clamping plate 29 to move away from each other and open in a naturally extended state. The sides of the lower clamping plate 28 and the upper clamping plate 29 that are close to each other are provided with matching clamping pads 31, and the lower clamping plate 28 is also provided with a guide column 32 extending upward at one end where the rotating shaft is provided.

[0039] The frame 1 is also provided with a guide pressing assembly for pressing the feed clamp 17, the guide pressing assembly includes a guide seat 33 and a plurality of pressing rollers 34, the guide seat 33 is provided with a guide groove 35 that slides with the guide column 32, the guide seat 33 includes a telescopic seat 33a and a translation seat 33b, the telescopic seat 33a is installed in the two feeding chutes 19 located above, and the translation seat 33b is installed in the two feeding chutes 19 located below, and the guide groove 35 of the translation seat 33b is arranged in a straight line on the side close to 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, and 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 column 32 of the feed clamp 17 slides to the middle of the guide groove 35 of the telescopic seat 33a through the inclined section 35a, the lower clamp plate 28 and the upper clamp plate 29 extend out of the feed chute 19 in the direction of the middle of the frame 1; the pressing roller 34 is rotatably installed on the guide seat 33 along the sliding direction of the feed clamp 17, and is located on the side of the guide seat 33 close to the middle of the frame 1. When the feed clamp 17 moves to the bottom of the pressing roller 34, the upper clamp plate 29 can be pressed by the pressing roller 34 to fit with the lower clamp plate 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 feeding chute 19 corresponding to the translation seat 33b. The limiting decorative plates 36 can also prevent the lower clamp plate 28 and the upper clamp plate 29 from extending out of the feeding chute 19.

[0040] The equipment provided in this embodiment is used in conjunction with a stainless steel coil, which is rotatably arranged on one side of the feed end of the equipment. 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, and then the feeding motor 16 is started. The feeding motor 16 drives the feeding clamp 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 through the transmission chain from the lower feeding chute 19 to the upper feeding chute 19, and at the same time, the guide column 32 of the feeding clamp 17 is inserted 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 larger than the diameter of the guide column 32 to form a trumpet-shaped structure with one side larger and the other side smaller, so that the guide column 32 can enter the guide groove 35 more easily. Continue to drive the feeding clamp 17 to move, and the guide column 32 drives the lower clamping plate 28 and the upper clamping plate 29 of the feeding clamp 17 to extend out of the feeding chute 19 under the action of the guide groove 35. 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. When the feeding clamp 17 continues to move, the upper clamping plate 29 will contact the pressing roller 34 and be pressed to the downward clamping plate 28 by the pressing roller 34, thereby clamping the stainless steel plate, and at this time, the opportunity drives the stainless steel plate to move synchronously.

[0042] When the feeding clamp 17 moves to the range out of the lamination roller 34, the upper clamp 29 automatically opens under the action of the torsion spring 30, and the guide column 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, and then the feeding clamp 17 goes back to the feeding chute 19 below and prepares to clamp and feed the stainless steel plate next time. According to actual needs, multiple groups of feeding clamps 17 are set in the feeding chute 19 to achieve uninterrupted clamping and feeding. Even during the stamping process, the stainless steel plate is clamped and fixed by multiple feeding clamps 17, which can also 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, and the elastic pressure pad 12 first contacts and presses the stainless steel plate to prevent the stainless steel plate from displacement, and then the trimming knife 8 and the hole needle 9 touch the stainless steel plate at the same time to complete the punching and cutting. Since the trimming knife 8 is provided with an angle blade 10 and a bending table 11, when punching out the inner tube blank, the angle blade 10 will cut the cut edge of the stainless steel plate raw material again, and then the bending table 11 will bend the cut edge of the cut stainless steel plate raw material downward, forming a downward bending structure, which increases the contact area between the stainless steel plate raw material and the inner tube blank, and then when the feeding clamp 17 pushes the stainless steel plate, the stainless steel plate raw material will drive the inner tube blank 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 suction structure can be provided in the lower die 7 according to requirements, so as to absorb and recover the waste chips generated during the stamping process.

[0045] The above-mentioned embodiment only expresses one implementation mode of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A continuous punching and forming device for a muffler inner tube, comprising a frame (1), on which a punching assembly (2) is mounted, characterized in that: The frame (1) is provided with a feeding assembly (3) on one side of the punching assembly (2) for feeding materials to the punching assembly (2), the feeding assembly (3) comprising a feeding motor (16) and a feeding clamp (17), the feeding clamp (17) being slidably mounted on the frame (1), the feeding motor (16) being fixedly mounted on the frame (1) and driving the feeding clamp (17) to slide towards or away from the punching assembly (2); the punching assembly (2) comprising a punching cylinder (5) fixedly mounted on the frame (1), An upper die (6) is fixedly mounted on the telescopic end of the pressure cylinder (5); a lower die (7) is fixedly mounted on the frame (1) at a position corresponding to the upper die (6) directly below the upper die; a trimming knife (8) and a plurality of hole needles (9) matching the size of the target muffler inner pipe are arranged on the lower surface of the upper die (6); an elastic pressure pad (12) is arranged in the gap between the trimming knife (8) and the hole needles (9) on the lower surface of the upper die (6); the thickness of the elastic pressure pad (12) is greater than the height of the trimming knife (8) and the hole needles (9).

2. The continuous punching and forming equipment for the inner tube of a muffler according to claim 1, characterized in that: The frame (1) is fixedly provided with a plurality of vertically extending guide light shafts (13); the upper die (6) is fixedly provided with a plurality of linear bearings (14) corresponding one to one with the guide light shafts (13); the upper die (6) is slidably connected to the guide light shafts (13) via the linear bearings (14); and the upper surface of the upper die (6) is fixedly provided with a plurality of structural reinforcement angle plates (15).

3. The continuous punching and forming equipment for the inner tube of a muffler according to claim 2, characterized in that: The trimming knife (8) is a rectangular structure. The trimming knife (8) is provided with right-angled corner blades (10) extending outward at the four vertex corners of the rectangular structure. The two sides of the corner blade (10) and the two sides of the corresponding vertex corners are arranged in a colinear manner. A bending platform (11) is also arranged on the outer side of the trimming knife (8).

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

5. The continuous punching and forming equipment for the inner tube of a muffler according to claim 4, characterized in that: The transmission structure has two groups, and the two groups of transmission structures are respectively located on both sides of the frame (1); the feeding motor (16) is a double-headed motor and the two power output ends are respectively connected to the planetary gear boxes (23) of the two groups of transmission structures; the reversing gears (22) of the two groups of transmission structures are fixedly connected to each other through a synchronous shaft, and the feeding clamps (17) respectively connected to the two groups of transmission structures are symmetrically arranged.

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 provided with a feeding chute (19), and the feeding clamp (17) comprises a slide seat (24) slidably mounted in the feeding chute (19), a fixing pin (25) for fixedly connecting with a transmission chain is fixedly mounted on one side of the slide seat (24), a telescopic slide slot (26) is arranged on the upper surface of the slide seat (24), a lower clamping plate (28) is slidably mounted on the upper surface of the slide seat (24) through the cooperation of the telescopic slide slot (26) and the telescopic slider (27), and one end of the upper surface of the lower clamping plate (28) is connected by a rotating shaft An upper clamping plate (29) is rotatably installed, and a torsion spring (30) is sleeved on the rotating shaft. The two ends of the torsion spring (30) respectively abut against the lower clamping plate (28) and the upper clamping plate (29), and the torsion spring (30) supports the lower clamping plate (28) and the upper clamping plate (29) to move away from each other and open in a naturally extended state. The sides of the lower clamping plate (28) and the upper clamping plate (29) that are close to each other are provided with mutually matching clamping cushions (31), and the lower clamping plate (28) is also provided with a guide column (32) extending upward at one end where the rotating shaft is provided.

7. The continuous punching and forming equipment for the inner tube of a muffler according to claim 6, characterized in that: The frame (1) is also provided with a guide pressing assembly for pressing the feeding clamp (17), the guide pressing assembly comprising a guide seat (33) and a plurality of pressing rollers (34), the guide seat (33) being provided with a guide groove (35) slidably matched with the guide column (32), the guide seat (33) comprising a telescopic seat (33a) and a translation seat (33b), the guide groove (35) of the translation seat (33b) being arranged in a straight line on a side close to 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 column (32) of the feeding clamp (17) slides to the middle of the guide groove (35) of the telescopic seat (33a), the lower clamping plate (28) and the upper clamping plate (29) extend out of the feeding chute (19) in the direction of the middle of the frame (1); the pressing roller (34) is rotatably installed on the guide seat (33) along the sliding direction of the feeding clamp (17) and is located on one side of the guide seat (33) close to the middle of the frame (1). When the feeding clamp (17) moves to the bottom of the pressing roller (34), the upper clamping plate (29) can be pressed by the pressing roller (34) to fit with the lower clamping plate (28).

8. The continuous punching and forming equipment for the inner tube of a muffler according to claim 7, characterized in that: The frame (1) is also fixedly provided with a supporting roller (18) for supporting the stainless steel plate, and is also fixedly provided with a limiting decorative plate (36) for shielding the translation seat (33b) and the feeding chute (19) corresponding to the translation seat (33b).

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