Stretch resistance detection device for plastic packaging bag

Abstract

The invention relates to the technical field of plastic packaging bag tensile detection, and discloses a plastic packaging bag tensile detection device which comprises a processing platform, a storage cabinet is arranged in the processing platform, supporting legs are fixedly connected to the four corners of the bottom of the processing platform, and a tensile detection mechanism is arranged at the top of the processing platform; the four corners of a plastic bag are stably clamped through a screw rod, a movable clamping plate and a fixed clamping plate, cooperative movement of a motor sliding rail, a linear motor, a movable frame, a sliding rod and a first sliding block is matched, pulling force on the two sides is converted into pulling force in four directions through an inclined sliding groove and a second sliding block, and stretching resistance detection in the four directions is conducted on the plastic bag. According to the design, the limitation that only two-side stretching detection is adopted in the prior art is overcome, the tensile data of the plastic bag in different directions can be obtained, the tensile performance of the plastic bag can be comprehensively evaluated, a more accurate basis is provided for quality evaluation, it is ensured that the plastic bags with different purposes can bear the tensile force in the corresponding direction in actual use, and the detection precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of anti - tensile detection of plastic packaging bags, and specifically relates to an anti - tensile detection device for plastic packaging bags. Background Technique

[0002] The tensile test is an important indicator to measure the quality of plastic bags. By testing parameters such as the tensile strength and elongation at break during the stretching process of plastic bags, the ability to withstand tensile force can be intuitively understood. Plastic bags for different uses have different requirements for these parameters. For example, supermarket shopping bags need to have a relatively high tensile strength to bear heavier goods. Through the tensile test, it can be judged whether the plastic bag meets the corresponding quality standards, ensuring the stability and reliability of product quality.

[0003] According to a plastic packaging bag anti - tensile detection device disclosed in a Chinese patent with the publication number "CN219179076U", which relates to the technical field of plastic packaging bag detection, it includes a bottom plate, which is U - shaped; a moving plate, movably arranged between two opposite side walls of the bottom plate; a first positioning plate, fixedly connected to the moving plate; a pressure sensor, fixedly connected to one side of the first positioning plate; a pulling plate, which is U - shaped, and two opposite side walls slidably penetrate through the first positioning plate; a support plate, fixedly connected to two opposite side walls of the pulling plate; a plurality of hook assemblies, respectively arranged on the support plate; a mounting plate, fixedly connected to one side wall of the bottom plate; a second positioning plate, which is U - shaped, fixedly connected to the side of the mounting plate opposite to the support plate; a clamping assembly, arranged on two opposite side walls of the second positioning plate.

[0004] When the above - mentioned patent is used, the plastic bag can be stretched to both sides for the tensile test. However, in actual use, the force direction of the plastic bag is diverse. Only stretching to both sides can only obtain the tensile data in one direction, and the performance differences in other directions cannot be known, resulting in low detection accuracy. Therefore, an anti - tensile detection device for plastic packaging bags is proposed to solve the above - mentioned problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an anti - tensile detection device for plastic packaging bags in view of the above - mentioned deficiencies in the prior art.

[0006] To solve the above - mentioned technical problem, the technical solution adopted by the present invention is: an anti - tensile detection device for plastic packaging bags, including a processing platform, a storage cabinet is arranged inside the processing platform, support legs are fixedly connected to the four corners of the bottom of the processing platform, and an anti - tensile detection mechanism is arranged on the top of the processing platform;

[0007] The anti - tensile detection mechanism includes two motor slides, a linear motor, a movable frame, a sliding rod, four first sliders, a screw rod, a movable clamping plate, a fixed clamping plate, and a first spring;

[0008] The motor slide rail is fixedly connected to the top of the processing platform. The linear motor is arranged on the motor slide rail. The movable frame is fixedly connected to the front of the linear motor. The slide rod is fixedly connected to the movable frame. The first slider is slidably connected to the slide rod. The first spring is sleeved outside the slide rod. One end of the first spring is fixedly connected to the first slider, and the other end of the first spring away from the first slider is fixedly connected to the movable frame. The bottom end of the screw rod threadedly penetrates through the first slider and extends downward. A rotating handle is fixedly connected to the top end of the screw rod. The movable clamping plate is fixedly connected to the bottom end of the screw rod. The movable clamping plate is rotatably connected to the bottom end of the screw rod. The fixed clamping plate is fixedly connected to one side of the first slider and is arranged below the movable clamping plate. Anti-slip pads are arranged on the opposite sides of the fixed clamping plate and the movable clamping plate. The four corners of the plastic bag are clamped and fixed by the four movable clamping plates and the fixed clamping plate, and the plastic bag is stretched to the left and right sides by the linear motor, so as to apply tensile forces to the left and right sides of the plastic bag for tensile resistance detection;

[0009] An inclined chute is formed in the top of the processing platform. A second slider is slidably connected inside the inclined chute. The second slider is fixedly connected to the bottom of the first slider. By providing the inclined chute and the second slider, the tensile forces applied to both sides of the plastic bag are changed into four directions.

[0010] Preferably, an exhaust mechanism is arranged on the top of the processing platform. The exhaust mechanism includes a movable block. Two first inclined rods are hinged to the back of the movable block. The other ends of the two first inclined rods away from the movable block are rotatably connected to the slide rod through bearings. When the two slide rods move to both sides, the movable block is driven to move downward through the first inclined rods.

[0011] Preferably, two second inclined rods are hinged to the front of the movable block. The bottom ends of the two second inclined rods are hinged to a vertical rod. A pressing plate is fixedly connected to the bottom end of the vertical rod. When the movable block moves downward, the two pressing plates are driven to move downward through the two second inclined rods and press on the upper surface of the plastic bag. As the movable block continues to move downward, the two pressing plates are squeezed to both sides, and the gas inside the plastic bag is squeezed to both sides.

[0012] A first chute is formed in the top of the pressing plate. A first rack is slidably connected inside the first chute through a slider. Needles are fixedly connected to the opposite sides of the two first racks. A transmission gear is fixedly connected to the bottom end of the second inclined rod. The transmission gear meshes with the first rack. Squeezing the gas towards the sealed side of the plastic bag will cause the plastic bag to bulge out an air chamber, and the needles pierce the sealed part of the plastic bag to help the gas escape.

[0013] Preferably, a toughness detection mechanism is provided on the top of the processing platform. The toughness detection mechanism includes two U-shaped slide rails, which are respectively fixedly connected to the front and rear sides of the processing platform. A number of third sliders are slidably connected inside the U-shaped slide rails. The third sliders are connected by a rope. A first movable plate is fixedly connected to the third slider away from the processing platform. A pressing rod is fixedly connected to the top of the movable block, and the bottom of the pressing rod contacts the first movable plate.

[0014] Preferably, a second movable plate is fixedly connected to the third slider close to the processing platform. A second spring is arranged inside the U-shaped slide rail. The bottom end of the second spring is fixedly connected to the second movable plate, and the top end of the second spring is fixedly connected to the inner wall of the U-shaped slide rail. The resilience of the second spring is used to drive the second movable plate to return to its original position.

[0015] Preferably, a horizontal groove is formed on the top of the processing platform. A round rod is arranged inside the horizontal groove. The front and rear ends of the round rod are respectively rotatably connected to the two second movable plates. When the second movable plate moves upward, it drives the round rod to move upward, and the middle part of the plastic bag in a taut state is pushed upward, so as to detect the toughness of the plastic bag.

[0016] Preferably, a gear is fixedly connected to the round rod, and a second rack is fixedly connected to the processing platform. The gear meshes with the second rack. Five triangular top blocks are fixedly connected to the round rod. The triangular top blocks are strip-shaped and horizontally arranged with the round rod. Different angles of rounded corners are formed at the ends of the five triangular top blocks away from the round rod, thus forming different sharpness. The toughness of the middle part of the plastic bag is detected by the five triangular top blocks with different sharpness.

[0017] The present invention adopts the above technical solutions, and can bring the following beneficial effects:

[0018] 1. By setting up a tensile strength detection mechanism, the four corners of the plastic bag are firmly clamped by the screw, the movable clamping plate and the fixed clamping plate. With the coordinated movement of the motor slide rail, the linear motor, the movable frame, the slide rod and the first slider, the two-side tensile force is converted into tensile forces in four directions by the inclined chute and the second slider, and the plastic bag is subjected to tensile tests in four directions. This design overcomes the limitation of traditional only two-side tensile tests, can obtain the tensile data of the plastic bag in different directions, comprehensively evaluate its tensile performance, provides a more accurate basis for quality evaluation, ensures that plastic bags for different uses can withstand the corresponding tensile forces in actual use, and improves the detection accuracy.

[0019] 2. The invention solves the problem of gas interference inside the plastic bag during the tensile test by setting up an exhaust mechanism, which closely cooperates with the tensile test process. During the tensile test, the sliding rod moves to both sides, driving the movable block to move downward. Then, through the second inclined rod, the pressing plate presses downward and squeezes the plastic bag to both sides, squeezing the internal gas to both sides. Since it is difficult for the gas on the sealed side of the plastic bag to be discharged, it will bulge out of the air chamber. At this time, the second inclined rod flips to drive the transmission gear, causing the first rack and the needle to pierce the air chamber to help the gas escape. This process ensures that the plastic bag is not affected by the internal gas during the stretching process, guarantees the accuracy of the test data, and at the same time avoids the plastic bag from bursting prematurely or having abnormal stretching deformation due to gas extrusion, making the test results more real and reliable.

[0020] 3. The invention further expands the detection function of the device and complements the tensile test by setting up a toughness detection mechanism. When the movable block of the exhaust mechanism moves downward, the pressure rod pushes the first movable plate, driving the third slider and the second movable plate to move upward, causing the round rod to push up the middle part of the tightened plastic bag to detect its toughness. At the same time, during the upward movement of the round rod, by means of the meshing rotation of the gear and the second rack, the five triangular top blocks with different sharpness levels are successively poked at the middle part of the plastic bag to detect its anti-puncture performance when dealing with hard objects with different sharpness levels. These test results can more comprehensively reflect the comprehensive performance of the plastic bag and provide richer data for product quality evaluation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 is an exploded view of the pressing plate area of the present invention;

[0023] Figure 3 is a schematic diagram of the structure of the sliding rod area of the present invention;

[0024] Figure 4 is in the present invention Figure 3 is an enlarged view of part A;

[0025] Figure 5 is a schematic diagram of the structure of the movable block area of the present invention;

[0026] Figure 6 is in the present invention Figure 5 is an enlarged view of part B;

[0027] Figure 7 is a schematic diagram of the internal structure of the U-shaped sliding rail area of the present invention;

[0028] Figure 8 is in the present invention Figure 7 is an enlarged view of part C;

[0029] Figure 9This is a front sectional view of the horizontal groove area in the present invention.

[0030] In the figure: 1, processing platform; 2, storage locker; 3, support leg; 4, tensile testing mechanism; 401, motor slide rail; 402, linear motor; 403, movable frame; 404, slide bar; 405, first slider; 406, screw; 407, movable clamping plate; 408, fixed clamping plate; 409, first spring; 4010, inclined chute; 4011, second slider; 5, exhaust mechanism; 501, movable block; 502, first inclined rod; 503, second inclined rod; 504, vertical rod; 505, pressing plate; 506, transmission gear; 507, first rack; 508, needle; 6, toughness testing mechanism; 601, U-shaped slide rail; 602, third slider; 603, cable; 604, first movable plate; 605, pressing rod; 606, second movable plate; 607, second spring; 608, horizontal groove; 609, round rod; 6010, gear; 6011, second rack; 6012, triangular top block. Specific embodiments

[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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figures 1-9 , an embodiment of the present invention is: a plastic packaging bag tensile resistance detection device, including a processing platform 1, a storage locker 2 is arranged inside the processing platform 1, support legs 3 are fixedly connected to the four corners of the bottom of the processing platform 1, and a tensile testing mechanism 4 is arranged on the top of the processing platform 1;

[0033] The tensile testing mechanism 4 includes two motor slide rails 401, a linear motor 402, a movable frame 403, a slide bar 404, four first sliders 405, a screw 406, a movable clamping plate 407, a fixed clamping plate 408, and a first spring 409;

[0034] The motor slide rail 401 is fixedly connected to the top of the processing platform 1. The linear motor 402 is arranged on the motor slide rail 401. The movable frame 403 is fixedly connected to the front of the linear motor 402. The slide bar 404 is fixedly connected to the movable frame 403. The first slider 405 is slidably connected to the slide bar 404. The first spring 409 is sleeved outside the slide bar 404. One end of the first spring 409 is fixedly connected to the first slider 405, and the other end of the first spring 409 away from the first slider 405 is fixedly connected to the movable frame 403. The bottom end of the screw 406 threadedly penetrates through the first slider 405 and extends downward. The top end of the screw 406 is fixedly connected with a turning handle. The movable clamping plate 407 is fixedly connected to the bottom end of the screw 406. The movable clamping plate 407 is rotatably connected to the bottom end of the screw 406. The fixed clamping plate 408 is fixedly connected to one side of the first slider 405 and is arranged below the movable clamping plate 407. Anti-slip pads are arranged on the opposite sides of the fixed clamping plate 408 and the movable clamping plate 407. The four corners of the plastic bag are clamped and fixed by the four movable clamping plates 407 and the fixed clamping plate 408, and the plastic bag is stretched to the left and right sides by the linear motor 402, so as to apply tensile forces to the left and right sides of the plastic bag for tensile resistance detection;

[0035] An inclined chute 4010 is opened at the top of the processing platform 1. A second slider 4011 is slidably connected inside the inclined chute 4010. The second slider 4011 is fixedly connected to the bottom of the first slider 405. By arranging the inclined chute 4010 and the second slider 4011, the tensile forces applied to both sides of the plastic bag are changed into four directions.

[0036] Working principle: First, lay the plastic bag flat on the processing platform 1, and place its four corners between the four movable clamping plates 407 and the fixed clamping plate 408 respectively. Then, rotate the four turning handles to drive the screws 406 to rotate, and move the four movable clamping plates 407 downward to fix the four corners of the plastic bag. Then, start the two linear motors 402 to move the two movable frames 403 and the slide bars 404 to the left and right sides respectively. The two slide bars 404 move to the left and right sides respectively to drive the four first sliders 405 to the left and right sides. At this time, the four first sliders 405 are subjected to the oblique acting forces of the inclined chute 4010 and the second slider 4011 during the movement process, and pull the four corners of the plastic bag in four directions respectively, thereby completing the tensile resistance detection of the plastic bag in four directions.

[0037] Please refer to Figures 1-9, on the basis of the above embodiments, in another embodiment of the present invention, an exhaust mechanism 5 is provided on the top of the processing platform 1. The exhaust mechanism 5 includes a movable block 501. Two first inclined rods 502 are hinged to the back of the movable block 501. The other ends of the two first inclined rods 502 away from the movable block 501 are rotatably connected to the slide rod 404 through bearings. When the two slide rods 404 move to both sides, the movable block 501 is driven to move downward through the first inclined rods 502.

[0038] Two second inclined rods 503 are hinged to the front of the movable block 501. The bottom ends of the two second inclined rods 503 are hinged to a vertical rod 504. The bottom end of the vertical rod 504 is fixedly connected to a pressing plate 505. When the movable block 501 moves downward, the two pressing plates 505 are driven to move downward through the two second inclined rods 503 and press on the upper surface of the plastic bag. As the movable block 501 continues to move downward, the two pressing plates 505 are squeezed to both sides, and the gas inside the plastic bag is squeezed to both sides.

[0039] A first chute is opened at the top of the pressing plate 505. A first rack 507 is slidably connected to the inside of the first chute through a slider. Needles 508 are fixedly connected to the opposite sides of the two first racks 507. A transmission gear 506 is fixedly connected to the bottom end of the second inclined rod 503. The transmission gear 506 meshes with the first rack 507. Squeezing the gas towards the sealed side of the plastic bag will cause an air chamber to bulge inside the plastic bag, and the sealed part of the plastic bag is punctured by the needle 508 to help the gas escape.

[0040] Working principle: When the two slide rods 404 move to both sides, the movable block 501 is driven to move downward through the first inclined rods 502. When the movable block 501 moves downward, the two pressing plates 505 are driven to move downward through the two second inclined rods 503 and press on the upper surface of the plastic bag. As the movable block 501 continues to move downward, the two pressing plates 505 are squeezed to both sides, and the gas inside the plastic bag is squeezed to both sides. Usually, one side of the plastic bag is open and the other side is sealed. Therefore, the gas on the sealed side cannot escape and will bulge into an air chamber. When the second inclined rod 503 pushes the two pressing plates 505 to both sides, it will turn over, and drive the first rack 507 and the needle 508 through the transmission gear 506, and puncture the air chamber through the needle 508, so as to discharge the gas inside the plastic bag.

[0041] Please refer to Figures 1-9, on the basis of the above embodiments, in another embodiment of the present invention, a toughness detection mechanism 6 is provided on the top of the processing platform 1. The toughness detection mechanism 6 includes two U-shaped slide rails 601, and the two U-shaped slide rails 601 are respectively fixedly connected to the front and rear sides of the processing platform 1. A number of third sliders 602 are slidably connected inside the U-shaped slide rails 601. The number of third sliders 602 are connected by a cable 603. A first movable plate 604 is fixedly connected to the third slider 602 away from the processing platform 1. A pressure rod 605 is fixedly connected to the top of the movable block 501, and the bottom of the pressure rod 605 contacts the first movable plate 604.

[0042] A second movable plate 606 is fixedly connected to the third slider 602 close to the processing platform 1. A second spring 607 is provided inside the U-shaped slide rail 601. The bottom end of the second spring 607 is fixedly connected to the second movable plate 606, and the top end of the second spring 607 is fixedly connected to the inner wall of the U-shaped slide rail 601. By setting the resilience of the second spring 607, the second movable plate 606 is driven to return to its original position.

[0043] A transverse groove 608 is opened on the top of the processing platform 1. A round rod 609 is provided inside the transverse groove 608. The front and rear ends of the round rod 609 are respectively rotatably connected to the two second movable plates 606. By the upward movement of the second movable plate 606, the round rod 609 is driven to move upward, and the middle part of the plastic bag in a taut state is pushed upward, so as to detect the toughness of the plastic bag.

[0044] A gear 6010 is fixedly connected to the round rod 609. A second rack 6011 is fixedly connected to the processing platform 1. The gear 6010 meshes with the second rack 6011. Five triangular top blocks 6012 are fixedly connected to the round rod 609. The triangular top blocks 6012 are arranged in a strip shape and are horizontally arranged with the round rod 609. The ends of the five triangular top blocks 6012 away from the round rod 609 are respectively provided with rounded corners at different angles, thus forming different sharpness. The toughness of the plastic bag is detected by the five triangular top blocks 6012 with different sharpness at the middle part of the plastic bag.

[0045] Working principle: The downward movement of the movable block 501 drives the downward movement of the pressure rod 605. During the downward movement of the pressure rod 605, it contacts the first movable plate 604 and presses the first movable plate 604 downward, and the second movable plate 606 is pushed upward through a number of third sliders 602. The upward movement of the second movable plate 606 drives the upward movement of the round rod 609, and the middle part of the plastic bag in a taut state is pushed upward, so as to detect the toughness of the plastic bag. During the upward movement of the round rod 609, it rotates under the action of the gear 6010 and the second rack 6011, and the middle part of the plastic bag is successively poked by the five triangular top blocks 6012 with different sharpness, so as to detect the anti-puncture performance of the plastic bag when dealing with hard objects with different sharpness.

[0046] The present invention provides a tensile resistance detection device for plastic packaging bags. There are many methods and ways to specifically implement this technical solution. The above description is only a preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. Each component not clearly defined in this embodiment can be implemented by using the prior art.

Claims

1. A tensile resistance detection device for plastic packaging bags, comprising a processing platform (1), characterized in that: Inside the processing platform (1), there is a storage locker (2). At the four corners of the bottom of the processing platform (1), there are support legs (3) fixedly connected. On the top of the processing platform (1), there is a tensile testing mechanism (4). The tensile testing mechanism (4) includes two motor sliders (401), a linear motor (402), a movable frame (403), a sliding rod (404), four first sliders (405), a screw rod (406), a movable clamping plate (407), a fixed clamping plate (408), and a first spring (409). The motor sliders (401) are fixedly connected to the top of the processing platform (1). The linear motor (402) is arranged on the motor sliders (401). The movable frame (403) is fixedly connected to the front of the linear motor (402). The sliding rod (404) is fixedly connected to the movable frame (403). The first sliders (405) are slidably connected to the sliding rod (404). The first spring (409) is sleeved outside the sliding rod (404). One end of the first spring (409) is fixedly connected to the first slider (405), and the other end of the first spring (409) far from the first slider (405) is fixedly connected to the movable frame (403). The bottom end of the screw rod (406) threadedly penetrates the first slider (405) and extends downward. The top end of the screw rod (406) is fixedly connected with a turning handle. The movable clamping plate (407) is fixedly connected to the bottom end of the screw rod (406). The movable clamping plate (407) is rotatably connected to the bottom end of the screw rod (406). The fixed clamping plate (408) is fixedly connected to one side of the first slider (405) and is arranged below the movable clamping plate (407). On the opposite side of the fixed clamping plate (408) and the movable clamping plate (407), there is an anti-slip pad. On the top of the processing platform (1), there is an inclined sliding groove (4010). Inside the inclined sliding groove (4010), there is a second slider (4011) slidably connected. The second slider (4011) is fixedly connected to the bottom of the first slider (405).

2. The anti-tensile detection device for a plastic packaging bag according to claim 1, wherein: On the top of the processing platform (1), there is an exhaust mechanism (5). The exhaust mechanism (5) includes a movable block (501). On the back of the movable block (501), there are two first inclined rods (502) hinged. The other ends of the two first inclined rods (502) far from the movable block (501) are rotatably connected to the sliding rod (404) through bearings.

3. The anti-tensile detection device for a plastic packaging bag according to claim 2, wherein: On the front of the movable block (501), there are two second inclined rods (503) hinged. The bottom ends of the two second inclined rods (503) are hinged to a vertical rod (504). The bottom end of the vertical rod (504) is fixedly connected to a pressing plate (505).

4. The anti-tensile detection device for a plastic packaging bag according to claim 3, wherein: On the top of the pressing plate (505), there is a first sliding groove. Inside the first sliding groove, there is a first rack (507) slidably connected through a slider. On the opposite sides of the two first racks (507), there are needles (508) fixedly connected. The bottom end of the second inclined rod (503) is fixedly connected to a transmission gear (506). The transmission gear (506) meshes with the first rack (507).

5. The anti-tensile detection device for a plastic packaging bag according to claim 4, characterized in that: A toughness detection mechanism (6) is provided on the top of the processing platform (1). The toughness detection mechanism (6) includes two U-shaped sliding rails (601), and the two U-shaped sliding rails (601) are respectively fixedly connected to the front and rear sides of the processing platform (1). A number of third sliders (602) are slidably connected inside the U-shaped sliding rails (601), and the number of third sliders (602) are connected by a cable (603). A first movable plate (604) is fixedly connected to the third slider (602) far from the processing platform (1). A pressure rod (605) is fixedly connected to the top of the movable block (501), and the bottom of the pressure rod (605) contacts the first movable plate (604).

6. The anti-tensile detection device for a plastic packaging bag according to claim 5, wherein: A second movable plate (606) is fixedly connected to the third slider (602) close to the processing platform (1). A second spring (607) is arranged inside the U-shaped sliding rail (601). The bottom end of the second spring (607) is fixedly connected to the second movable plate (606), and the top end of the second spring (607) is fixedly connected to the inner wall of the U-shaped sliding rail (601).

7. The anti-tensile detection device for a plastic packaging bag according to claim 6, characterized in that: A transverse groove (608) is opened on the top of the processing platform (1). A round rod (609) is arranged inside the transverse groove (608). The front and rear ends of the round rod (609) are respectively rotatably connected to the two second movable plates (606).

8. A tensile resistance detection device for plastic packaging bags according to claim 7, characterized in that: A gear (6010) is fixedly connected to the round rod (609). A second rack (6011) is fixedly connected to the processing platform (1). The gear (6010) meshes with the second rack (6011). Five triangular top blocks (6012) are fixedly connected to the round rod (609). The triangular top blocks (6012) are arranged in a strip shape and are horizontally arranged with the round rod (609). Different angles of rounded corners are respectively opened at the ends of the five triangular top blocks (6012) far from the round rod (609).

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