Punching device for aluminum alloy automobile part production

Abstract

The punching device for aluminum alloy automobile part production comprises a machine body, a punching assembly is installed at the top end of the machine body, a feeding structure used for feeding part plates is arranged on the machine body, a pushing structure is arranged on the machine body, a limiting structure is arranged on the pushing structure, and a guiding structure used for guiding the plates is arranged on the machine body. A pressing structure used for pressing plates is arranged on the guide structure, and a collecting structure used for collecting waste is arranged on the machine body. According to the scheme, automatic plate feeding is achieved through the arrangement of the feeding structure, automatic plate pushing is achieved through the arrangement of the material pushing structure, the plate can be conveniently punched through a punching machine, the flexibility is improved, the material pushing structure can be conveniently fixed through the arrangement of the limiting structure, the stability is improved, and the practicability is high. And the guide structure is arranged so that the plate can be conveniently guided, meanwhile, deviation of the plate is avoided, and the product quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of punching of automotive parts, and specifically relates to a punching device for the production of aluminum alloy automotive parts. Background Technique

[0002] Punching of aluminum alloy automotive parts is a common process in aluminum alloy processing, mainly used for manufacturing various automotive parts (such as body structural parts, chassis parts, wheels, etc.). Specific-shaped and sized holes are processed on aluminum alloy plates or profiles through a punching press or special equipment.

[0003] When traditional punching machines process aluminum alloy plates, since the punching machine exerts a downward force on the aluminum alloy plate, one end of the aluminum alloy plate may be lifted, resulting in a reduction in the processing quality of the product. At the same time, the aluminum alloy plate needs to be manually lifted onto the punching machine. Due to the high height of the punching machine, it is not convenient to lift the aluminum alloy plate onto the punching machine. At the same time, the waste generated during punching usually directly falls to the bottom of the punching machine, which is not convenient for collecting the waste. Summary of the Invention

[0004] The purpose of the present invention is to provide a punching device for the production of aluminum alloy automotive parts to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A punching device for the production of aluminum alloy automotive parts includes a machine body. An punching assembly is installed at the top of the machine body. A feeding structure for feeding the accessory plate is provided on the machine body. A pushing structure is provided on the machine body. A limiting structure is provided on the pushing structure. A guiding structure for guiding the plate is provided on the machine body. A pressing structure for pressing the plate is provided on the guiding structure. A collecting structure for collecting waste is provided on the machine body;

[0007] The feeding structure includes sliding grooves. Four sliding grooves are opened on the inner side walls of the machine body. Four sliders are slidably connected inside the four sliding grooves. An upper feeding plate is fixedly connected between the four sliders. Two positioning plates are also slidably connected to the inner side walls at both ends of the machine body. A first lead screw with opposite thread directions at both ends is rotatably connected inside the machine body. The two ends of the first lead screw are respectively threadedly connected to the two positioning plates. A first motor is installed on the outer side wall of the machine body. The output shaft of the first motor is connected to the first lead screw.

[0008] In order to prevent the two positioning plates from shifting when sliding inside the machine body, as a preferred solution of the present utility model: both the sliding grooves and the sliding blocks are in a "convex" shape structure. Inside the machine body, two sliding rods are fixedly connected, and both of the two sliding rods are slidably connected to the two positioning plates. Inside the machine body, two hydraulic cylinders are also installed, and the telescopic ends of the two hydraulic cylinders are connected to the bottom side of the feeding plate.

[0009] In order to enable the accessory plates to be automatically fed, as a preferred solution of the present utility model: the pushing structure includes a connecting block. A connecting block is slidably connected to the machine body. A pushing plate is rotatably connected to the connecting block. The pushing plate is slidably connected to the machine body. A sliding plate is slidably connected to the pushing plate. The sliding plate is threadedly connected to a third lead screw. The third lead screw is rotatably connected to the pushing plate. A driving groove is provided on the third lead screw.

[0010] In order to enable the connecting block to automatically slide inside the machine body, as a preferred solution of the present utility model: the connecting block is threadedly connected to a second lead screw. The second lead screw is rotatably connected to the machine body. A second motor is installed on the machine body. The output shaft of the second motor is fixedly connected to the second lead screw.

[0011] In order to enable the pushing plate to rotate to one side during feeding without affecting the feeding of the accessory plates, as a preferred solution of the present utility model: the limiting structure includes a limiting post. A limiting post is slidably connected to the pushing plate. The limiting post is inserted into the connecting block. The limiting post is fixedly connected to a pulling plate. The pulling plate is slidably connected to the pushing plate. A guiding rod is fixedly connected to the pushing plate. The guiding rod is slidably connected to the pulling plate. A first return spring is fixedly connected between the pulling plate and the pushing plate. A limiting groove matching the limiting post is provided on the other side of the connecting block.

[0012] In order to enable accurate guiding when the accessory plates are discharged, as a preferred solution of the present utility model: the guiding structure includes guiding plates. Two guiding plates are slidably connected to the machine body. Inside the machine body, a fourth lead screw with opposite thread directions at both ends is rotatably connected. The two guiding plates are respectively threadedly connected to both ends of the fourth lead screw. A third motor is installed outside the machine body. The output end of the third motor is connected to the fourth lead screw. A plurality of guiding rollers are rotatably connected to the guiding plates.

[0013] In order to prevent the discharged plates from tilting at one end during operation, as a preferred solution of the present utility model: the pressing structure includes pressing plates. A pressing plate is slidably connected to the bottom side of each of the two guiding plates. A cylinder is installed at the top end of each of the two guiding plates. The telescopic ends of the two cylinders are respectively connected to the two pressing plates. A plurality of guiding rollers are also rotatably connected to the bottom side of the two pressing plates.

[0014] In order to effectively collect the debris after punching the plate, as a preferred solution of the present invention: the collection structure includes a collection box, the collection box is detachably connected to the machine body, a blanking trough is provided at the bottom end of the stamping area on the machine body, and the blanking trough is connected to the interior of the collection box.

[0015] In order to prevent the collection box from sliding during operation, as a preferred solution of the present invention: the collection structure also includes a limit rod, the limit rod is slidably connected to the front end side wall of the collection box, the limit rod is plugged into the machine body, a foot pedal is slidably connected inside the front end side wall of the collection box, and the foot pedal extends to the outside of the collection box, the limit rod and the foot pedal are fixedly connected, and a second return spring is fixedly connected between the foot pedal and the collection box.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The sheet is pushed and loaded through the pushing structure, and the loading plate is driven to slide upward by the hydraulic cylinder to realize automatic loading, which improves flexibility. At the same time, the two positioning plates can make the sheet located in the middle of the loading plate according to the sheets of different widths, which improves practicality.

[0018] 2. The connecting block drives the push plate to move to the left, so that the push plate pushes the plate to slide to the right. When it slides to a certain position, the plate is punched through the machine body. When the right side of the plate is subjected to downward force, since the left end of the plate is located under the slide plate, the left end of the plate will not tilt up, so that the plate is pushed by the push plate to achieve automatic pushing, so that the machine body can punch the plate. The slide plate can prevent the left end of the plate from tilting up when the right end is under pressure, thereby improving the product processing quality.

[0019] 3. After the push plate rotates ninety degrees, the limit column slides to the right under the action of the first return spring, so that the limit column and the limit groove on the connecting block are engaged, thereby facilitating the fixation of the push plate and the connecting block through the engagement between the limit column and the connecting block, thereby improving stability, and through the rotational connection between the push plate and the connecting block, there will be no obstruction when placing the plate on the loading structure, thereby improving flexibility.

[0020] 4. The two guide plates move toward each other. When the right end of the plate slides between the two guide plates, it guides the plate and avoids the plate from shifting during the punching process, thereby improving product quality. The setting of the clamping structure facilitates the application of downward force to the plate and avoids one end of the plate from tilting during the punching process. The setting of the collection structure facilitates the collection of waste generated during the punching process, thereby improving practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Structural schematic diagram of the present invention;

[0022] Figure 2 Structural schematic diagram of the discharging end of the present invention;

[0023] Figure 3 is Figure 2 Enlarged schematic diagram of the structure of part A shown in;

[0024] Figure 4 Structural schematic diagram of the connection between the connecting block and the pushing plate of the present invention;

[0025] Figure 5 Cross-sectional schematic diagram of the connecting block and the pushing plate of the present invention;

[0026] Figure 6 Structural schematic diagram of the connection between the guide plate and the fourth lead screw of the present invention;

[0027] Figure 7 Structural schematic diagram of the collection box of the present invention;

[0028] Figure 8 Cross-sectional schematic diagram of the collection box of the present invention;

[0029] Figure 9 is Figure 8 Enlarged schematic diagram of the structure of part B shown in.

[0030] In the figure: 1, machine body; 2, feeding structure; 201, feeding plate; 202, sliding groove; 203, sliding block; 204, positioning plate; 205, first lead screw; 206, first motor; 207, sliding rod; 208, hydraulic cylinder; 3, pushing structure; 301, connecting block; 302, pushing plate; 303, sliding plate; 304, second lead screw; 305, second motor; 306, third lead screw; 307, driving groove; 4, limiting structure; 401, limiting column; 402, pulling plate; 403, guiding rod; 404, first return spring; 405, limiting groove; 5, guiding structure; 501, guide plate; 502, fourth lead screw; 503, third motor; 504, guide roller; 6, pressing structure; 601, air cylinder; 602, pressing plate; 7, collecting structure; 701, collection box; 702, limiting rod; 703, foot pedal; 704, second return spring; 705, blanking groove. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figures 1-9 , the present invention provides a technical solution: a punching device for producing aluminum alloy automotive parts, including a machine body 1, a punching assembly 8 is installed at the top of the machine body 1, a feeding structure 2 for feeding the accessory plate is provided on the machine body 1, a pushing structure 3 is provided on the machine body 1, a limiting structure 4 is provided on the pushing structure 3, a guiding structure 5 for guiding the plate is provided on the machine body 1, a pressing structure 6 for pressing the plate is provided on the guiding structure 5, and a collecting structure 7 for collecting waste is provided on the machine body 1;

[0033] The feeding structure 2 includes a sliding groove 202. Four sliding grooves 202 are opened on the inner side wall of the machine body 1. Four sliders 203 are slidably connected inside the four sliding grooves 202. A feeding plate 201 is fixedly connected between the four sliders 203. Two positioning plates 204 are also slidably connected to the inner side walls at both ends of the machine body 1. A first lead screw 205 with opposite thread directions at both ends is rotatably connected inside the machine body 1. The two ends of the first lead screw 205 are respectively threadedly connected to the two positioning plates 204. A first motor 206 is installed on the outer side wall of the machine body 1, and the output shaft of the first motor 206 is connected to the first lead screw 205.

[0034] During specific use, first, a forklift is used to transport multiple plates onto the feeding plate 201. After the plates are transported onto the feeding plate 201, by starting the first motor 206, when the output shaft of the first motor 206 rotates, it drives the first lead screw 205 to rotate, so that the first lead screw 205 threadedly drives the two positioning plates 204 to slide towards each other, and the positioning plates 204 push the plates. At the same time, when the bottom surface of the topmost plate is flush with the table surface of the machine body 1, the pushing structure 3 is used to push and feed the plates.

[0035] Both the sliding groove 202 and the slider 203 are in a "convex" shape structure. Two sliding rods 207 are fixedly connected inside the machine body 1, and both sliding rods 207 are slidably connected to the two positioning plates 204. Two hydraulic cylinders 208 are also installed inside the machine body 1, and the telescopic ends of the two hydraulic cylinders 208 are connected to the bottom side of the feeding plate 201.

[0036] During specific use, when the plate is located in the middle of the feeding plate 201, and then the pushing plate 302 is rotated to the initial state, at this time, the hydraulic cylinder 208 can be started to make the feeding plate 201 slide upward.

[0037] The pushing structure 3 includes a connecting block 301, which is slidably connected to the body 1, and a pushing plate 302 is rotatably connected to the connecting block 301. The pushing plate 302 is slidably connected to the body 1, and a slide plate 303 is slidably connected to the pushing plate 302. The slide plate 303 and the third screw rod 306 are threadedly connected, and the third screw rod 306 is rotatably connected to the pushing plate 302. The third screw rod 306 is provided with a driving groove 307.

[0038] During specific use, when the bottom surface of the topmost plate is flush with the surface of the machine body 1, first insert the hexagonal wrench into the driving groove 307. At this time, the third screw rod 306 is rotated by the hexagonal wrench to make the third screw rod 306 thread drive the slide plate 303 to slide downward, so that the slide plate 303 can be adjusted according to plates of different thicknesses.

[0039] The connecting block 301 is threadedly connected to the second screw rod 304 , and the second screw rod 304 is rotationally connected to the machine body 1 . A second motor 305 is installed on the machine body 1 , and the output shaft of the second motor 305 is fixedly connected to the second screw rod 304 .

[0040] When in use, the push plate 302 is rotated to the initial state, and then the second motor 305 is started. When the output shaft of the second motor 305 rotates, the second screw rod 304 is driven to rotate, so that the second screw rod 304 threadedly drives the connecting block 301 to slide to the right, so that the connecting block 301 drives the push plate 302 to move to the left, and the push plate 302 pushes the plate to slide to the right. When sliding to a certain position, the plate is punched through the machine body 1. When the right side of the plate is subjected to downward force, since the left end of the plate is located under the slide plate 303, the left end of the plate will not tilt up, so that the plate is pushed by the push plate 302 to achieve automatic pushing, so that the machine body 1 can punch the plate, and the slide plate 303 can prevent the left end of the plate from tilting up when the right end is subjected to pressure, thereby improving the product processing quality.

[0041] The limiting structure 4 includes a limiting column 401, the limiting column 401 is slidably connected to the push plate 302, the limiting column 401 is plugged into the connecting block 301, the limiting column 401 is fixedly connected to the pull plate 402, the pull plate 402 and the push plate 302 are slidably connected, a guide rod 403 is fixedly connected to the push plate 302, the guide rod 403 and the pull plate 402 are slidably connected, a first return spring 404 is fixedly connected between the pull plate 402 and the push plate 302, and a limiting groove 405 matching the limiting column 401 is provided on the other side of the connecting block 301.

[0042] During specific use, by pulling the pull plate 402, when the pull plate 402 slides to the left, it drives the limit post 401 to slide to the left, the first return spring 404 contracts, so that the limit post 401 no longer engages with the connection block 301. When the pull plate 402 slides to the left, it slides more smoothly through the guide rod 403. At this time, the pushing plate 302 can be rotated. When the pushing plate 302 rotates 90 degrees, the limit post 401 slides to the right under the action of the first return spring 404, so that the limit post 401 engages with the limit groove 405 on the connection block 301. Thus, through the engagement between the limit post 401 and the connection block 301, it is convenient to fix between the pushing plate 302 and the connection block 301, improving the stability. And through the rotational connection between the pushing plate 302 and the connection block 301, it will not cause obstruction when placing the plate on the feeding structure 2, improving the flexibility.

[0043] The guiding structure 5 includes a guiding plate 501. Two guiding plates 501 are slidably connected to the machine body 1. A fourth lead screw 502 with opposite thread directions at both ends is rotatably connected inside the machine body 1. The two guiding plates 501 are respectively threadedly connected to both ends of the fourth lead screw 502. A third motor 503 is installed outside the machine body 1, and the output end of the third motor 503 is connected to the fourth lead screw 502. A plurality of guiding rollers 504 are rotatably connected to the guiding plate 501.

[0044] During specific use, before processing the plate, according to the width of the plate, by starting the third motor 503, when the output shaft of the third motor 503 rotates, it drives the fourth lead screw 502 to rotate. Since the thread directions at both ends of the fourth lead screw 502 are opposite, the two guiding plates 501 move towards each other. When the right end of the plate slides between the two guiding plates 501, it plays a guiding role for the plate, avoiding the deviation of the plate during the drilling process, thus improving the product quality. And through the plurality of guiding rollers 504 on the guiding plate 501, the sliding friction of the plate is converted into rolling friction, making the feeding process of the plate more stable.

[0045] The pressing structure 6 includes a pressing plate 602. A pressing plate 602 is slidably connected to the bottom sides of the two guiding plates 501 respectively. A cylinder 601 is installed at the top end of each of the two guiding plates 501, and the telescopic ends of the two cylinders 601 are respectively connected to the two pressing plates 602. A plurality of guiding rollers 504 are also rotatably connected to the bottom sides of the two pressing plates 602.

[0046] During specific use, when the right end of the plate slides below the pressing plate 602, by the operation of the cylinder 601, it can drive the pressing plate 602 to slide downward, so that the pressing plate 602 presses the plate, thus applying a downward force to the plate through the pressing plate 602, avoiding the right end of the plate from tilting when drilling the left side of the plate, thus improving the drilling quality of the product.

[0047] The collection structure 7 includes a collection box 701, the collection box 701 is detachably connected to the machine body 1, a blanking groove 705 is provided at the bottom end of the stamping area on the machine body 1, and the blanking groove 705 is communicated with the inside of the collection box 701.

[0048] During specific use, the stamping debris falls into the inside of the collection box 701 from the blanking groove 705, so that the debris can be collected.

[0049] The collection structure 7 further includes a limiting rod 702, the limiting rod 702 is slidably connected to the front side wall of the collection box 701, the limiting rod 702 is inserted between the limiting rod 702 and the machine body 1, a foot pedal 703 is slidably connected to the inside of the front side wall of the collection box 701, and the foot pedal 703 extends to the outside of the collection box 701. The limiting rod 702 is fixedly connected to the foot pedal 703, and a second return spring 704 is fixedly connected between the foot pedal 703 and the collection box 701.

[0050] During specific use, when the collection box 701 is full, by stepping on the foot pedal 703, at the same time the second return spring 704 contracts, when the foot pedal 703 slides downward, it drives the limiting rod 702 to slide downward, so that the limiting rod 702 is no longer engaged with the machine body 1. At this time, the waste in the collection box 701 can be pulled to a designated position for processing. Therefore, the collection box 701 facilitates the collection of the waste generated during punching, improves the practicability, and the limiting rod 702 facilitates the fixation between the collection box 701 and the machine body 1, improving the stability.

[0051] Working principle: When the plate is located at the middle position of the loading plate 201, then the pushing plate 302 is rotated to the initial state. At this time, the hydraulic cylinder 208 can be started to make the loading plate 201 slide upward. When the bottom surface of the uppermost plate is flush with the table surface of the machine body 1, the pushing plate 302 is used to push the plate to slide to the right. When it slides to a certain position, the machine body 1 punches the plate.

[0052] By starting the third motor 503, when the output shaft of the third motor 503 rotates, it drives the fourth lead screw 502 to rotate. Since the threads at both ends of the fourth lead screw 502 are opposite in direction, the two guide plates 501 move towards each other, and the right end of the plate slides between the two guide plates 501.

[0053] By the operation of the cylinder 601, the pressing plate 602 can be driven to slide downward, so that the pressing plate 602 presses the plate. The stamping debris falls into the inside of the collection box 701 from the blanking groove 705, so that the debris can be collected. When the collection box 701 is full, by stepping on the foot pedal 703, the limiting rod 702 is no longer engaged with the machine body 1. At this time, the waste in the collection box 701 can be pulled to a designated position for processing.

[0054] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A punching device for the production of aluminum alloy automotive parts, including a machine body (1), and a punching component (8) is installed at the top of the machine body (1), characterized in that, The machine body (1) is provided with a feeding structure (2) for feeding accessory plates, the machine body (1) is provided with a pushing structure (3), the pushing structure (3) is provided with a limiting structure (4), the machine body (1) is provided with a guiding structure (5) for guiding the plates, the guiding structure (5) is provided with a pressing structure (6) for pressing the plates, and the machine body (1) is provided with a collecting structure (7) for collecting waste materials; The feeding structure (2) includes a sliding groove (202). Four sliding grooves (202) are formed in the inner side wall of the machine body (1). Sliders (203) are slidably connected to the interiors of the four sliding grooves (202). A feeding plate (201) is fixedly connected between the four sliders (203). Two positioning plates (204) are also slidably connected to the inner side walls at both ends of the machine body (1). A first lead screw (205) with opposite thread directions at both ends is rotatably connected to the interior of the machine body (1). The two ends of the first lead screw (205) are respectively threadedly connected to the two positioning plates (204). A first motor (206) is installed on the outer side wall of the machine body (1). The output shaft of the first motor (206) is connected to the first lead screw (205).

2. The punching device for producing aluminum alloy automotive parts according to claim 1, characterized in that: Both the sliding groove (202) and the slider (203) are in a "convex" structure. Two sliding rods (207) are fixedly connected to the interior of the machine body (1), and both of the two sliding rods (207) are slidably connected to the two positioning plates (204). Two hydraulic cylinders (208) are also installed in the interior of the machine body (1). The telescopic ends of the two hydraulic cylinders (208) are connected to the bottom side of the feeding plate (201).

3. The punching device for producing aluminum alloy automotive parts according to claim 1, characterized in that: The pushing structure (3) includes a connecting block (301). The connecting block (301) is slidably connected to the machine body (1). A pushing plate (302) is rotatably connected to the connecting block (301). The pushing plate (302) is slidably connected to the machine body (1). A sliding plate (303) is slidably connected to the pushing plate (302). The sliding plate (303) is threadedly connected to a third lead screw (306). The third lead screw (306) is rotatably connected to the pushing plate (302). A driving groove (307) is formed in the third lead screw (306).

4. The punching device for producing aluminum alloy automobile parts according to claim 3, characterized in that: The connecting block (301) is threadedly connected to a second lead screw (304). The second lead screw (304) is rotatably connected to the machine body (1). A second motor (305) is installed on the machine body (1). The output shaft of the second motor (305) is fixedly connected to the second lead screw (304).

5. The punching device for producing aluminum alloy automobile parts according to claim 3, characterized in that: The limiting structure (4) includes a limiting post (401). The limiting post (401) is slidably connected to the pushing plate (302). The limiting post (401) is inserted between the connecting block (301). The limiting post (401) is fixedly connected to the pulling plate (402). The pulling plate (402) is slidably connected to the pushing plate (302). A guiding rod (403) is fixedly connected to the pushing plate (302). The guiding rod (403) is slidably connected to the pulling plate (402). A first return spring (404) is fixedly connected between the pulling plate (402) and the pushing plate (302). A limiting groove (405) matching the limiting post (401) is provided on the other side of the connecting block (301).

6. The punching device for producing aluminum alloy automotive parts according to claim 1, characterized in that: The guiding structure (5) includes guiding plates (501). Two guiding plates (501) are slidably connected to the machine body (1). A fourth lead screw (502) with opposite thread directions at both ends is rotatably connected inside the machine body (1). The two guiding plates (501) are respectively threadedly connected to both ends of the fourth lead screw (502). A third motor (503) is installed outside the machine body (1). The output end of the third motor (503) is connected to the fourth lead screw (502). A plurality of guiding rollers (504) are rotatably connected to the guiding plates (501).

7. An punching device for the production of aluminum alloy automotive parts according to claim 6, characterized in that: The pressing structure (6) includes pressing plates (602). One pressing plate (602) is slidably connected to the bottom sides of the two guiding plates (501) respectively. A cylinder (601) is installed at the top end of each of the two guiding plates (501). The telescopic ends of the two cylinders (601) are respectively connected to the two pressing plates (602). A plurality of guiding rollers (504) are also rotatably connected to the bottom sides of the two pressing plates (602).

8. The punching device for producing aluminum alloy automotive parts according to claim 1, characterized in that: The collecting structure (7) includes a collecting box (701). The collecting box (701) is detachably connected to the machine body (1). A blanking groove (705) is provided at the bottom end of the stamping area on the machine body (1), and the blanking groove (705) is communicated with the inside of the collecting box (701).

9. The punching device for producing aluminum alloy automotive parts according to claim 8, characterized in that: The collecting structure (7) further includes a limiting rod (702). The limiting rod (702) is slidably connected to the front side wall of the collecting box (701). The limiting rod (702) is inserted between the limiting rod (702) and the machine body (1). A foot pedal (703) is slidably connected inside the front side wall of the collecting box (701), and the foot pedal (703) extends outside the collecting box (701). The limiting rod (702) is fixedly connected to the foot pedal (703). A second return spring (704) is fixedly connected between the foot pedal (703) and the collecting box (701).

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