Silencing plate automatic punching device for automobile silencer production

Abstract

The invention relates to the technical field of punching, in particular to a silencing plate automatic punching device for automobile silencer production, which comprises a machining table and other parts, a placing table for placing a workpiece is mounted on the machining table, a through hole is formed in the placing table, and a hydraulic telescopic rod is mounted at the top of the machining table; a fixing plate is fixedly connected to a telescopic rod of the hydraulic telescopic rod, a fixing cylinder is fixedly connected to the bottom face of the fixing plate, a punching die is slidably connected to the fixing cylinder, and a first elastic piece is arranged between the punching die and the fixing cylinder. Parts such as the coarse grinding plate, the fine grinding plate and the connecting plates are arranged, a small hole is punched through the punching die, then the guiding assembly is driven to guide the connecting plates to be away from each other, the connecting plates drive the fine grinding plate and the coarse grinding plate to be away from each other, and meanwhile the driving assembly drives the connecting plates to rotate; and the rough grinding plate grinds the small hole punched by the punching die into a large hole with the required diameter, so that distorted and collapsed parts and the like on the edge of the original small hole can be ground off.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of punching, in particular to an automatic punching device for sound-absorbing plates in automobile muffler production. BACKGROUND

[0002] Automobile mufflers are mainly used to reduce the noise generated when engine exhaust gases pass through the exhaust pipe. In the exhaust pipe, the exhaust gases encounter various holes, partitions and sound-absorbing materials when passing through the muffler. These structures can change the direction, speed and pressure of the airflow, thereby reducing the propagation of noise. The sound-absorbing plates of automobile mufflers usually need to be punched with mounting holes during production to ensure that the various parts of the muffler can be accurately and firmly connected together. Existing punching devices, such as the patent with the publication number CN219075876U, disclose a sound-absorbing plate punching device for muffler production. Although the punching head moves downward to punch the sound-absorbing plate, it can punch different positions of the sound-absorbing plate, improving the efficiency and effectiveness of punching. However, when the punching head exerts pressure on the sound-absorbing plate, it inevitably causes the holes to twist, collapse and other phenomena. This phenomenon can cause uneven airflow, increase noise, and thus affect the sound-absorbing effect of the muffler. In view of this, the present application proposes an automatic punching device for sound-absorbing plates in automobile muffler production to solve the above technical problems. SUMMARY

[0003] In order to overcome the technical problems mentioned in the background art, the present application provides an automatic punching device for sound-absorbing plates in automobile muffler production.

[0004] The technical solution is as follows: an automatic punching device for sound-absorbing plates in automobile muffler production, comprising a processing table, a placement table for placing workpieces is installed on the processing table, a through hole is provided on the placement table, a hydraulic telescopic rod is installed on the top of the processing table, a fixed plate is fixedly connected to the telescopic rod of the hydraulic telescopic rod, a fixed cylinder is fixedly connected to the bottom surface of the fixed plate, a punching die is slidingly connected to the fixed cylinder, a first elastic member is provided between the punching die and the fixed cylinder, a baffle is fixedly connected to the through hole in the placement table, an installation cylinder is rotatably connected to the outer side wall of the fixed cylinder, the installation cylinder is driven to rotate by a driving assembly, a connecting plate is slidingly connected to the installation cylinder, a third elastic member is provided between the connecting plate and the installation cylinder, a polishing assembly is installed on the outer side wall of the connecting plate, and the connecting plate is guided by a guiding assembly to realize mutual moving away or moving close.

[0005] More preferably, the polishing assembly comprises a movable plate slidingly connected to the side wall of the connecting plate, a fourth elastic member is provided between the movable plate and the connecting plate, and a fine grinding plate and a coarse grinding plate are fixedly connected to the outer side wall of the movable plate from top to bottom.

[0006] More preferably, the driving assembly comprises a first gear fixed on the top of the mounting cylinder, a second gear matched with the first gear is rotatably connected to the bottom surface of the fixed plate, and the second gear is driven to rotate by a driving motor mounted on the bottom surface of the fixed plate.

[0007] More preferably, a gap is arranged between the movable plate and the connecting plate, a straight rod is fixed on the outer sidewall of the mounting cylinder, an adjusting block is slidably connected to the straight rod, the adjusting block is located between the gap between the movable plate and the connecting plate, a second inclined surface is arranged on the side surface of the adjusting block close to the movable plate, the second inclined surface abuts against the movable plate, the adjusting block is driven to slide up and down by an electric push rod mounted on the outer sidewall of the mounting cylinder, and the electric push rod is self-provided with a power module and a wireless connection module.

[0008] More preferably, the punching die is in the shape of a "convex" character, a guide rod is fixed on the top surface of the lower part of the punching die in a circumferential direction, a connecting rod is slidably connected to the top end of the guide rod, the connecting rod is fixed on the bottom surface of the first gear, a second elastic member is arranged between the connecting rod and the guide rod, the guide rod is in the shape of a "b" character, and a first inclined surface is arranged on the lower end of the guide rod.

[0009] More preferably, the lower end of the guide rod is provided with a contact surface, the contact surface is in the shape of a circular arc, the diameter of the contact surface is equal to the diameter of the punching die, and the distance between the outermost sidewall of the polishing assembly and the center point of the fixed cylinder in the initial position is less than the distance between the outermost sidewall of the punching die and the center point of the fixed cylinder.

[0010] More preferably, the diameter of the baffle is greater than the inner diameter of the lower end of the punching die, but the diameter of the baffle is less than the outer diameter of the lower end of the punching die, a push plate is fixed at the center of the fixed cylinder, straight cylinders are fixed on the bottom surface of the fixed plate in a symmetrical manner, a pressing plate is slidably connected to the lower end of the straight cylinder, and a fifth elastic member is arranged between the pressing plate and the straight cylinder.

[0011] More preferably, a screen is arranged directly below the placement table in the processing table, a first collection box is slidably connected in the processing table, the first collection box is located directly below the screen, a second collection box is mounted in the first collection box, and the screen is inclined towards the second collection box.

[0012] Beneficial effects: 1、The present application is provided with coarse grinding plate, fine grinding plate and connecting plate and other components, first through the punching die punch out a small hole, then drive the guide assembly guide connecting plate away from each other, in turn connecting plate drive fine grinding plate and coarse grinding plate away from each other, at the same time drive assembly drive connecting plate rotation, in turn coarse grinding plate will original punching die punch out a small hole into the required diameter of the big hole, so can the original small hole edge appears twist, collapse and other parts of the polishing, so can eliminate the edge defects of hole, finally using fine grinding plate for fine grinding, can further remove the small defects and burrs left in the process of rough grinding, make the hole wall more smooth, so as to reduce the roughness of hole wall, make the airflow can more smoothly through the muffler, thereby effectively reducing the airflow unevenness and noise, further improve the sound attenuation effect.

[0013] 2、The present application is provided with straight rod, adjusting block and electric push rod and other components, through the external controller and electric push rod wireless connection, then start electric push rod, in turn electric push rod telescopic rod drive adjusting block to move down, in turn make the second inclined surface on the adjusting block extrude movable plate, make movable plate away from each other, movable plate pull fourth elastic piece, make fourth elastic piece store elastic potential energy, in turn movable plate drive coarse grinding plate and fine grinding plate expansion, in turn can change the distance from coarse grinding plate to the outermost wall distance fixed cylinder center point, in turn can change the polishing diameter of big hole. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the schematic diagram of the three-dimensional structure of the present application.

[0015] Figure 2 It is the schematic diagram of the adjusting block, straight cylinder and punching die and other components of the present application.

[0016] Figure 3 It is the schematic diagram of the fifth elastic piece, second gear and first gear and other components of the present application.

[0017] Figure 4 It is the sectional view of the fixed cylinder, punching die and push plate and other components of the present application.

[0018] Figure 5 It is the sectional view of the guide rod, connecting rod and second elastic piece.

[0019] Figure 6 It is the sectional view of the adjusting block, connecting plate and movable plate and other components of the present application.

[0020] Figure 7 It is the sectional view of the processing table, screen and second collecting box and other components of the present application.

[0021] Figure 8 It is the sectional view of the placing table and baffle.

[0022] Wherein, the above-mentioned drawings include the following reference signs: 101, processing table, 102, placing table, 1021, through hole, 103, hydraulic telescopic rod, 104, fixed plate, 105, fixed cylinder, 106, punching die, 107, first elastic member, 108, push plate, 109, baffle, 201, guide rod, 2011, first inclined surface, 2012, contact surface, 202, connecting rod, 203, second elastic member, 301, mounting cylinder, 302, connecting plate, 303, third elastic member, 304, movable plate, 305, fourth elastic member, 306, coarse grinding plate, 307, fine grinding plate, 401, adjusting block, 4011, second inclined surface, 402, straight rod, 403, electric push rod, 501, first gear, 502, second gear, 503, driving motor, 601, straight cylinder, 602, pressing plate, 603, fifth elastic member, 701, screen, 702, first collection box, 703, second collection box. DETAILED DESCRIPTION

[0023] The present application will now be described more fully with reference to the accompanying drawings, in which the current preferred embodiments of the application are illustrated. However, the application may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness, and fully convey the scope of the application to the skilled person.

[0024] An automatic punching device for sound-absorbing plate of automobile muffler production, comprising a processing table 101, a placing table 102, a through hole 1021, a hydraulic telescopic rod 103, a fixed plate 104, a fixed cylinder 105, a punching die 106, a first elastic member 107, a push plate 108, a baffle 109, a guide rod 201, a first inclined surface 2011, a contact surface 2012, a connecting rod 202, a second elastic member 203, a mounting cylinder 301, a connecting plate 302, a third elastic member 303, a movable plate 304, a fourth elastic member 305, a coarse grinding plate 306, a fine grinding plate 307, an adjusting block 401, a second inclined surface 4011, a straight rod 402, an electric push rod 403, a first gear 501, a second gear 502, a driving motor 503, a straight cylinder 601, a pressing plate 602, a fifth elastic member 603, a screen 701, a first collection box 702, and a second collection box 703. Figures 1-8As shown, including processing platform 101, processing platform 101 is mounted on the placement of workpieces for placing the platform 102, the workpiece is specifically a sound-absorbing panel, the placement of platform 102 is provided with a through hole 1021 for processing, the top of processing platform 101 is provided with a hydraulic telescopic rod 103, the telescopic rod of hydraulic telescopic rod 103 is fixedly connected with a fixed plate 104, the bottom surface of fixed plate 104 is fixedly connected with a fixed cylinder 105, the fixed cylinder 105 is slidably connected with a punching die 106, the first elastic element 107 is arranged between the punching die 106 and the fixed cylinder 105, the first elastic element 107 is specifically a spring, the through hole 1021 in the placement of platform 102 is fixedly connected with a baffle 109, the baffle 109 is circular, the diameter of baffle 109 is greater than the inner diameter of the lower end of punching die 106, but the diameter of baffle 109 is smaller than the outer diameter of the lower end of punching die 106, the outer side wall of fixed cylinder 105 is rotatably connected with a mounting cylinder 301, the mounting cylinder 301 is driven to rotate by a driving assembly, the mounting cylinder 301 is slidably connected with a connecting plate 302, the third elastic element 303 is arranged between the connecting plate 302 and the mounting cylinder 301, the third elastic element 303 is specifically a spring, the polishing assembly is mounted on the outer side wall of connecting plate 302, the connecting plate 302 is guided by a guide assembly to realize mutual moving away or moving close to each other; the polishing assembly comprises a movable plate 304 slidably connected to the side wall of connecting plate 302, the fourth elastic element 305 is arranged between the movable plate 304 and the connecting plate 302, the fourth elastic element 305 is specifically a spring, the outer side wall of movable plate 304 is sequentially fixedly connected with a fine grinding plate 307 and a coarse grinding plate 306 from top to bottom; It can be seen that the workpiece is placed on the placement table 102 manually or by a robot, and the position of the workpiece is adjusted, and then the hydraulic telescopic rod 103 is started, and the telescopic rod of the hydraulic telescopic rod 103 drives the fixed plate 104 to move downward, and then the fixed plate 104 drives the punching die 106 to move downward, and then the punching die 106 applies pressure to the workpiece, and then punches out a small hole. The edge of the small hole will inevitably be distorted, collapsed, etc. This phenomenon will cause uneven airflow, increase noise, and thus affect the silencing effect of the muffler. The present invention can solve this problem. After punching the small hole, Afterwards, the punching die 106 will continue to move downward, and then the punching die 106 will touch the baffle 109, and then the baffle 109 will contact the punching die 106, so that the punching die 106 stops moving. At this time, the fixed plate 104 will still move downward, and then the punching die 106 will move upward relative to the fixed cylinder 105, and then the punching die 106 will squeeze the first elastic member 107. As the punching die 106 moves upward relative to the fixed cylinder 105, the guide assembly will be driven to guide the connecting plates 302 away from each other, so that the connecting plates 302 will expand outward, and the connecting plates 302 will be pushed outward. 02 pulls the third elastic member 303, so that the third elastic member 303 stores elastic potential energy, and then the connecting plate 302 drives the fine grinding plate 307 and the coarse grinding plate 306 to move away from each other, and at the same time starts the driving component, the driving component drives the installation cylinder 301 to rotate, and then the installation cylinder 301 drives the connecting plate 302 to rotate, and then the coarse grinding plate 306 will rotate in the small hole punched by the original punching die 106, and then the coarse grinding plate 306 will grind the small hole punched by the original punching die 106 into a large hole of the required diameter, so that the distortion, collapse and other parts of the original small hole edge can be ground away, so as to eliminate The edge defects of the hole are removed, and defects such as distortion and collapse generated during the punching process are removed, thereby improving the silencer effect of the silencer. After the rough grinding plate 306 completes the grinding of the large hole, the fixed plate 104 will still move downward, and then the rough grinding plate 306 moves to the bottom of the large hole, and the fine grinding plate 307 will move into the large hole for fine grinding. The fine grinding can further remove the small flaws and burrs left by the rough grinding process, making the hole wall smoother, thereby reducing the roughness of the hole wall, allowing the airflow to pass through the silencer more smoothly, thereby effectively reducing the unevenness and noise of the airflow, and further improving the silencer effect.

[0025] Specifically, the driving assembly comprises a first gear 501 fixed at the top of the mounting cylinder 301, a second gear 502 rotatably connected to the bottom surface of the fixed plate 104 and matched with the first gear 501, and a driving motor 503 mounted on the bottom surface of the fixed plate 104 and used to drive the second gear 502 to rotate. Therefore, when the driving motor 503 is started, the output shaft of the driving motor 503 drives the second gear 502 to rotate, the second gear 502 drives the first gear 501 to rotate through meshing transmission, and then the first gear 501 drives the mounting cylinder 301 to rotate, so that the polishing assembly rotates. In this way, the rotation speed of the coarse grinding plate 306 and the fine grinding plate 307 can be controlled, the polishing process can be carried out according to the set accurate parameters, and the smoothness of the hole wall is ensured.

[0026] Specifically, the punching die 106 is in the shape of "convex", the guide assembly comprises a guide rod 201 fixedly connected to the periphery of the lower top surface of the punching die 106, a connecting rod 202 slidably connected to the top end of the guide rod 201, the connecting rod 202 being fixedly connected to the bottom surface of the first gear 501, and a second elastic member 203 provided between the connecting rod 202 and the guide rod 201, the second elastic member 203 being specifically a spring, the guide rod 201 is in the shape of "b", the lower end of the guide rod 201 is provided with a first inclined surface 2011, and the lower end of the guide rod 201 is provided with a contact surface 2012 in the shape of a circular arc, the diameter of the contact surface 2012 being equal to the diameter of the punching die 106, in the initial position, the distance between the outermost wall of the coarse grinding plate 306 and the fine grinding plate 307 and the center point of the fixed cylinder 105 is smaller than the distance between the outermost wall of the punching die 106 and the center point of the fixed cylinder 105, so that the coarse grinding plate 306 and the fine grinding plate 307 can not interfere with the operation of the punching die 106, and when the baffle 109 contacts the punching die 106, the punching die 106 moves upward relative to the fixed cylinder 105, and then the guide rod 201 moves upward relative to the connecting plate 302, and then the first inclined surface 2011 of the guide rod 201 presses the connecting plate 302, so that the connecting plate 302 moves away from each other, and then the connecting plate 302 expands outward, and then the connecting plate 302 drives the coarse grinding plate 306 and the fine grinding plate 307 to expand outward, while the coarse grinding plate 306 is driven to rotate by the driving assembly, and then the coarse grinding plate 306 rotates, and then the coarse grinding plate 306 gradually polishes the small hole punched out by the punching die 106 to the target required large hole under the action of the first inclined surface 2011, and when the guide rod 201 continues to move upward relative to the connecting plate 302, the contact surface 2012 of the guide rod 201 contacts the connecting plate 302, the coarse grinding plate 306 polishes the small hole punched out by the punching die 106 to the target required large hole, and then the guide rod 201 continues to move upward relative to the connecting plate 302, and then the coarse grinding plate 306 moves to the inside of the placement table 102, and the coarse grinding plate 306 no longer continues to polish the large hole, and then the fine grinding plate 307 contacts the inner wall of the large hole of the workpiece, and then the fine grinding plate 307 can remove the small defects and burrs left in the coarse grinding process, so that the hole wall is smoother.

[0027] Further, the gap is arranged between the movable plate 304 and the connecting plate 302, a straight rod 402 is fixedly connected on the outer side wall of the mounting cylinder 301, an adjusting block 401 is slidingly connected on the straight rod 402, the adjusting block 401 is located between the gap between the movable plate 304 and the connecting plate 302, a second inclined surface 4011 is arranged on the side surface of the adjusting block 401 close to the movable plate 304, the second inclined surface 4011 abuts against the movable plate 304, the adjusting block 401 is driven to slide up and down by the electric push rod 403 mounted on the outer side wall of the mounting cylinder 301, the electric push rod 403 is provided with a power module and a wireless connection module, and the wireless connection module is a Bluetooth wireless connection module. Therefore, the external controller is wirelessly connected with the electric push rod 403, and then the electric push rod 403 is started, and then the telescopic rod of the electric push rod 403 drives the adjusting block 401 to move downward, and then the second inclined surface 4011 on the adjusting block 401 extrudes the movable plate 304, so that the movable plate 304 moves away from each other, the fourth elastic member 305 is pulled by the movable plate 304, so that the fourth elastic member 305 stores elastic potential energy, and then the movable plate 304 drives the coarse grinding plate 306 and the fine grinding plate 307 to expand outward, so that the distance between the coarse grinding plate 306 and the outermost wall of the fixed cylinder 105 to the center point of the fixed cylinder 105 can be changed, and then the polishing diameter of the large hole can be changed. It should be noted that although the adjusting block 401 makes the movable plate 304 expand outward to increase the diameter of the large hole, the distance between the coarse grinding plate 306 and the fine grinding plate 307 and the outermost wall of the fixed cylinder 105 to the center point of the fixed cylinder 105 is always less than the distance between the punching die 106 and the outermost wall of the fixed cylinder 105 to the center point of the fixed cylinder 105.

[0028] Further, in order to make the punching more stable and prevent the workpiece from deviating, the bottom surface of the fixed plate 104 is fixedly connected with a straight cylinder 601 in a symmetrical manner, the lower end of the straight cylinder 601 is slidingly connected with a pressing plate 602, the lowest point of the pressing plate 602 is lower than the punching die 106 at the initial position, and the fifth elastic member 603 is arranged between the pressing plate 602 and the straight cylinder 601, and the fifth elastic member 603 is a spring. Therefore, when the fixed plate 104 moves downward, the pressing plate 602 will contact the workpiece first than the punching die 106, and then the pressing plate 602 can fix the workpiece, and the fifth elastic member 603 is used to assist the pressing plate 602 to reset, so that the punching is more stable and the workpiece deviation can be effectively prevented.

[0029] Further, the push plate 108 is fixedly connected to the center of the fixing cylinder 105, the screen 701 is arranged below the placing table 102 in the processing table 101, the first collecting box 702 is slidably connected in the processing table 101, the first collecting box 702 is below the screen 701, the second collecting box 703 is arranged in the first collecting box 702, and the screen 701 is obliquely arranged towards the second collecting box 703. Therefore, when the punching die 106 punches a small hole in the workpiece, the push plate 108 pushes the punched sheet waste downwards, so that the sheet waste falls on the screen 701. Since the diameter of the baffle 109 is greater than the inner diameter of the lower end of the punching die 106, but the diameter of the baffle 109 is smaller than the outer diameter of the lower end of the punching die 106, the punched sheet waste can smoothly pass through the baffle 109. Since the screen 701 is obliquely arranged, the sheet waste slides into the second collecting box 703 under the action of gravity and is collected. The powder debris after being polished by the coarse grinding plate 306 and the fine grinding plate 307 falls into the first collecting box 702 through the screen 701 and is collected.

[0030] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. An automatic punching device for muffler plates used in automobile muffler production, characterized in that it includes: A processing table (101) is provided, a placing table (102) for placing a workpiece is installed on the processing table (101), a through hole (1021) is provided on the placing table (102), a hydraulic telescopic rod (103) is installed on the top of the processing table (101), a fixed plate (104) is fixedly connected to the telescopic rod of the hydraulic telescopic rod (103), a fixed cylinder (105) is fixedly connected to the bottom surface of the fixed plate (104), a punching die (106) is slidably connected to the fixed cylinder (105), and a first elastic member (107) is provided between the punching die (106) and the fixed cylinder (105). ), a baffle (109) is fixedly connected to the through hole (1021) in the placement table (102), a mounting cylinder (301) is rotatably connected to the outer wall of the fixed cylinder (105), the mounting cylinder (301) is driven by a driving assembly to achieve rotation, a connecting plate (302) is circumferentially slidably connected to the mounting cylinder (301), a third elastic member (303) is provided between the connecting plate (302) and the mounting cylinder (301), a grinding assembly is installed on the outer wall of the connecting plate (302), and the connecting plates (302) are guided by the guide assembly to achieve mutual distance or mutual approach.

2. The automatic punching device for muffler plates used in automobile muffler production according to claim 1, characterized in that: The grinding assembly includes a movable plate (304) slidably connected to the side wall of the connecting plate (302), a fourth elastic member (305) is provided between the movable plate (304) and the connecting plate (302), and a fine grinding plate (307) and a coarse grinding plate (306) are fixed to the outer side wall of the movable plate (304) in sequence from top to bottom.

3. The automatic punching device for muffler plates used in automobile muffler production according to claim 2, characterized in that: The driving assembly includes a first gear (501) fixedly connected to the top of the mounting cylinder (301), a second gear (502) which is rotatably connected to the bottom surface of the fixing plate (104) and matches the first gear (501), and the second gear (502) is driven by a driving motor (503) installed on the bottom surface of the fixing plate (104) to achieve rotation.

4. The automatic punching device for muffler plates used in automobile muffler production according to claim 3 is characterized in that: A gap is set between the movable plate (304) and the connecting plate (302), a straight rod (402) is fixedly connected to the outer wall of the installation cylinder (301), an adjustment block (401) is slidably connected to the straight rod (402), and the adjustment block (401) is located between the gap between the movable plate (304) and the connecting plate (302). A second inclined surface (4011) is set on a side of the adjustment block (401) close to the movable plate (304), and the second inclined surface (4011) abuts against the movable plate (304). The adjustment block (401) is driven by an electric push rod (403) installed on the outer wall of the installation cylinder (301) to slide up and down, and the electric push rod (403) is equipped with a power module and a wireless connection module.

5. The automatic punching device for muffler plates used in automobile muffler production according to claim 4, characterized in that: The punching die (106) is in a "convex" shape, and the guide assembly includes a guide rod (201) fixedly connected to the top surface of the lower part of the punching die (106). The top end of the guide rod (201) is slidably connected to a connecting rod (202). The connecting rod (202) is fixedly connected to the bottom surface of the first gear (501). A second elastic member (203) is provided between the connecting rod (202) and the guide rod (201). The guide rod (201) is in a "b" shape, and a first inclined surface (2011) is provided at the lower end of the guide rod (201).

6. The automatic punching device for muffler plates used in automobile muffler production according to claim 5, characterized in that: A contact surface (2012) is provided at the lower end of the guide rod (201), and the contact surface (2012) is arc-shaped, and its diameter is equal to the diameter of the punching die (106). In the initial position, the distance between the outermost wall of the grinding component and the center point of the fixed cylinder (105) is smaller than the distance between the outermost wall of the punching die (106) and the center point of the fixed cylinder (105).

7. The automatic punching device for muffler plates used in automobile muffler production according to claim 6, characterized in that: The diameter of the baffle (109) is larger than the inner diameter of the lower end of the punching die (106), but the diameter of the baffle (109) is smaller than the outer diameter of the lower end of the punching die (106). A push plate (108) is fixedly connected to the center of the fixed cylinder (105). A straight cylinder (601) is symmetrically fixed to the bottom surface of the fixed plate (104). A pressing plate (602) is slidably connected to the lower end of the straight cylinder (601). A fifth elastic member (603) is provided between the pressing plate (602) and the straight cylinder (601).

8. The automatic punching device for muffler plates used in automobile muffler production according to claim 7, characterized in that: A screen (701) is provided in the processing table (101) directly below the placement table (102), a first collection box (702) is slidably connected in the processing table (101), the first collection box (702) is located directly below the screen (701), a second collection box (703) is installed in the first collection box (702), and the screen (701) is tilted toward the second collection box (703).

Images