Plasma sterilization apparatus for medical packaging material

Abstract

This invention relates to the field of pharmaceutical packaging material processing technology, and provides a plasma sterilization device for pharmaceutical packaging materials, including a support, a worm gear, a motor, a flattening roller, and a winding roller. The worm gear is rotatably connected to the back of the support, the motor is mounted on the back of the support and connected to the end of the worm gear, the flattening roller is mounted on the surface of the support, and the winding roller is mounted on the surface of the support. It also includes an outer sterilization assembly. The beneficial effects of this invention are: by repeatedly scraping the inner wall of the aluminum foil with rubber strips, residual creases on the aluminum foil surface can be smoothed out, ensuring that the aluminum foil is not affected by stripes during winding. The use of multiple rubber strips ensures that the friction time between a single rubber strip and the aluminum foil is short, avoiding dust adhesion to the aluminum foil surface due to static electricity. Simultaneously, by evenly distributing the contact time with the aluminum foil among multiple rubber strips, the problem of reduced cleaning effect due to overheating of the rubber strips due to friction can be effectively prevented.

Description

Technical Field

[0001] This invention belongs to the field of pharmaceutical packaging material processing technology, and in particular relates to a plasma sterilization device for pharmaceutical packaging materials. Background Technology

[0002] Pharmaceutical packaging materials (such as pharmaceutical aluminum foil and composite films) are directly related to drug quality and medication safety. Their surface cleanliness and sterilization effect are crucial to barrier performance, sealing performance, and aseptic assurance levels. Currently, most pharmaceutical packaging materials adopt an integrated online production and sterilization process for roll materials, completing surface cleaning and sterilization treatment before winding.

[0003] Traditional ultraviolet sterilization relies on direct sunlight, which is difficult to cover hidden areas such as folds and insides of packaging materials. The reflection utilization rate is low, and local sterilization failure is likely to occur. Plasma is easily affected by airflow disturbances, resulting in uneven concentration distribution and poor sterilization effect on the material bonding surface.

[0004] Aluminum foil and flexible composite film are prone to wrinkles and shifts during transport. The folded areas cannot fully contact the sterilization medium, resulting in incomplete sterilization and affecting the subsequent winding flatness and yield.

[0005] Open-type plasma or ozone generators are easily affected by external air, and active particles and strong oxidizing gases can quickly escape, making it difficult to form an effective concentration on the material surface. They also have high energy consumption and low sterilization efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide a plasma sterilization device for pharmaceutical packaging materials, aiming to solve the technical problems existing in the prior art mentioned in the background.

[0007] This invention is implemented as follows: a plasma sterilization device for pharmaceutical packaging materials includes a support, a worm gear, a motor, a flattening roller, and a winding roller. The worm gear is rotatably connected to the back of the support, the motor is mounted on the back of the support and connected to the end of the worm gear, the flattening roller is mounted on the surface of the support, and the winding roller is mounted on the surface of the support. The device also includes:

[0008] An outer sterilization assembly, mounted on a support, is used to sterilize the outer side of medical packaging materials. The outer sterilization assembly includes a first gear, a base, a glass sleeve, and a plasma generator. The first gear is rotatably connected to the support and meshes with a worm gear. The base is fixedly connected to the surface of the first gear and has air inlets evenly distributed on its sidewalls. The plasma generator is mounted on the surface of the base, and the glass sleeve is fitted over the outside of the plasma generator and mounted on the base.

[0009] An inner sterilization assembly, mounted on a support, is used to sterilize the inner side of medical packaging materials. The inner sterilization assembly includes a second gear, a first sleeve, a round rod, a first gear disc, a second sleeve, a bidirectional groove, a slide block, a rubber band, a clamp, and a traction rope. The second gear is rotatably connected to the support and meshes with a worm gear. The first sleeve is fixedly connected to the surface of the second gear. The first gear disc is rotatably connected inside the first sleeve. The round rod is fixedly connected to the surface of the first gear disc. The second sleeve is rotatably connected to the outer wall of the round rod. The bidirectional groove is formed on the surface of the second sleeve. The slide block is slidably connected to the outer wall of the second sleeve. The rubber band is rotatably connected to the outer wall of the first sleeve. The clamp is fixedly connected to the outer wall of the rubber band. The traction rope is fixedly connected between the clamp and the slide block.

[0010] As a preferred technical solution of the present invention: the outer sterilization component includes a light shield fixedly connected to the outer wall of the support, a mirror panel is uniformly installed on the inner wall of the light shield, an irradiation opening is opened at the bottom of the light shield, a first cover plate is fastened to the side of the light shield away from the support, the first cover plate and the base seal the two ends of the glass sleeve, a fan is installed on the inner wall of the first cover plate, and an air guide pipe is fixedly connected to the outer wall of the first cover plate, the air outlet of the fan and the air inlet of the air guide pipe are collinear.

[0011] As another preferred technical solution of the present invention: the multiple mirror panels focus the ultraviolet light generated by the plasma generator toward the irradiation opening.

[0012] As another preferred technical solution of the present invention: the surface of the first sleeve is uniformly provided with air storage grooves, the surface of the first sleeve is uniformly provided with air injection grooves, the air injection grooves are all connected to the air storage grooves, and the outer wall of the first sleeve and the interior of the air storage grooves are symmetrically fixedly connected with directional discs, and the rubber belt is rotatably connected to the directional discs.

[0013] As another preferred technical solution of the present invention: a second cover plate is fixedly connected to the end of the round rod away from the first gear plate, a positioning groove is opened on the surface of the second cover plate, the inner wall of the second cover plate is in contact with the side of the first sleeve away from the bracket, the side of the air guide pipe away from the first cover plate is engaged with the positioning groove, and a speed-increasing gear is rotatably connected inside the first sleeve, the speed-increasing gear meshes with the first gear plate and the second gear plate.

[0014] As another preferred technical solution of the present invention: the rubber strips are all located inside the gas storage tank, and the outer wall of the rubber strips is flush with the outer wall of the first sleeve.

[0015] As another preferred technical solution of the present invention: a dust collection frame is slidably connected inside the first sleeve, and a dust collection groove is provided on the side of the dust collection frame near the rubber belt. A spring is uniformly fixedly connected between the middle part of the dust collection frame and the slide seat.

[0016] The beneficial effects of the embodiments of the present invention are as follows:

[0017] By repeatedly scraping the inner wall of the aluminum foil with rubber strips, residual creases on the surface of the aluminum foil can be smoothed out, ensuring that the aluminum foil will not be affected by the presence of stripes during the winding process. The use of multiple rubber strips ensures that the contact time between each rubber strip and the aluminum foil is short, avoiding the accumulation of dust on the aluminum foil surface due to static electricity. At the same time, by distributing the contact time with the aluminum foil evenly among multiple rubber strips, the problem of the cleaning effect deteriorating due to overheating of the rubber strips due to friction can be effectively prevented.

[0018] The gas is injected into the gas storage tank of the first sleeve through the gas delivery tube. At this time, because the aluminum foil is attached to the surface of the first sleeve, the gas storage tank is sealed by the aluminum foil. Therefore, the plasma and ozone will replace the original air inside the gas storage tank, so that the inner wall of the aluminum foil is efficiently sterilized under the combined action of plasma and ozone. This ensures that the side of the aluminum foil that is in direct contact with the drug can be highly sterilized. The sealed state allows the strong oxidizing free radicals to act efficiently on the surface of the aluminum foil, preventing the sterilization effect from being poor due to the escape of sterilizing gas caused by external air turbulence. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the overall structure provided in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the overall structure from the back, provided in an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the overall structure of the outer sterilization component provided in an embodiment of the present invention;

[0022] Figure 4 This is an exploded view of the outer sterilization component structure provided in an embodiment of the present invention;

[0023] Figure 5 This is an exploded view of the inner sterilization component structure provided in an embodiment of the present invention;

[0024] Figure 6 This is a cross-sectional schematic diagram of the first sleeve structure provided in an embodiment of the present invention;

[0025] Figure 7 This is a schematic internal cross-sectional view of the first sleeve structure provided in an embodiment of the present invention;

[0026] Figure 8 This is a partial schematic diagram of the dust collection rack structure provided in an embodiment of the present invention;

[0027] Figure 9 This is a partial schematic diagram of the slide structure provided in an embodiment of the present invention.

[0028] In the picture:

[0029] 1. Support frame; 2. Worm gear; 3. Motor; 4. Outer sterilization assembly; 5. Inner sterilization assembly; 6. Flattening roller; 7. Rewinding roller;

[0030] 41. First gear; 42. Base; 43. Glass sleeve; 44. Plasma generator; 45. Light shield; 46. Mirror panel; 47. Irradiation opening; 48. First cover plate; 49. Fan; 410. Air duct;

[0031] 51. Second gear; 52. First sleeve; 53. Round rod; 54. First gear disc; 55. Second cover plate; 56. Positioning groove; 57. Second sleeve; 58. Bidirectional slide groove; 59. Second gear disc; 510. Speed-increasing gear; 511. Slide block; 512. Rubber belt; 513. Clamp; 514. Traction rope; 515. Dust collection frame; 516. Dust collection trough; 517. Spring.

[0032] 521. Gas storage tank; 522. Gas injection tank; 523. Orientation plate. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0034] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various elements, but unless otherwise stated, these elements are not limited by these terms. These terms are used only to distinguish one element from another.

[0035] like Figures 1 to 9 As shown, in one embodiment, a plasma sterilization device for pharmaceutical packaging materials is proposed, including a support 1, a worm gear 2, a motor 3, a flattening roller 6, and a take-up roller 7. The worm gear 2 is rotatably connected to the back of the support 1, the motor 3 is mounted on the back of the support 1 and connected to the end of the worm gear 2, the flattening roller 6 is mounted on the surface of the support 1, and the take-up roller 7 is mounted on the surface of the support 1. The device also includes:

[0036] The outer sterilization component 4 is mounted on the support 1 and is used to sterilize the outside of the medical packaging material. The outer sterilization component 4 includes a first gear 41, a base 42, a glass sleeve 43 and a plasma generator 44. The first gear 41 is rotatably connected to the support 1 and meshes with the worm gear 2. The base 42 is fixedly connected to the surface of the first gear 41 and its side wall is evenly provided with air inlets. The plasma generator 44 is mounted on the surface of the base 42. The glass sleeve 43 is sleeved on the outside of the plasma generator 44 and mounted on the base 42.

[0037] The inner sterilization component 5, mounted on the support 1, is used for sterilizing the inner side of medical packaging materials. The inner sterilization component 5 includes a second gear 51, a first sleeve 52, a round rod 53, a first gear disc 54, a second sleeve 57, a bidirectional groove 58, a slide block 511, a rubber belt 512, a clamp 513, and a traction rope 514. The second gear 51 is rotatably connected to the support 1 and meshes with the worm gear 2. The first sleeve 52 is fixedly connected to the surface of the second gear 51. The first gear disc 54 is rotatably connected to the inside of the first sleeve 52. The round rod 53 is fixedly connected to the surface of the first gear disc 54. The second sleeve 57 is rotatably connected to the outer wall of the round rod 53. The bidirectional groove 58 is formed on the surface of the second sleeve 57. The slide block 511 is slidably connected to the outer wall of the second sleeve 57. The rubber belt 512 is rotatably connected to the outer wall of the first sleeve 52. The clamp 513 is fixedly connected to the outer wall of the rubber belt 512. The traction rope 514 is fixedly connected between the clamp 513 and the slide block 511.

[0038] In practical application, the motor 3 is powered on and drives the worm gear 2 to start rotating. When the worm gear 2 rotates, it will drive the first gear 41 and the second gear 51 to rotate together through meshing. Before the aluminum foil is wound onto the winding roller 7, the flattening roller 6 will support the aluminum foil and rotate at high speed. During the rotation, the flattening roller 6 will pass through the symmetrical grooves on its surface, so that the aluminum foil will be pulled to both sides of the flattening roller 6 after contacting it. This will flatten the aluminum foil before winding and avoid wrinkles on the aluminum foil during winding, which would prevent the folded parts of the aluminum foil from being directly sterilized.

[0039] After the aluminum foil is flattened by the flattening roller 6 on the equipment, it will be transmitted between the outer sterilization component 4 and the inner sterilization component 5. When the plasma generator 44 is running, it will generate plasma, ultraviolet rays and ozone. The ultraviolet rays generated by the plasma generator 44 will irradiate the inside of the light shield 45 through the glass sleeve 43. The ultraviolet rays that hit the inside of the light shield 45 will be refracted inside the light shield 45 due to the reflection of the mirror panel 46. Under the action of the mirror panel 46 inside the light shield 45, the ultraviolet rays will irradiate the surface of the aluminum foil material through the irradiation opening 47, thereby disinfecting the outside of the aluminum foil material.

[0040] When the second gear 51 meshes with the rotating worm 2, it will rotate together. When the second gear 51 rotates, it will drive the first sleeve 52 to rotate together. When the first sleeve 52 rotates, the second cover plate 55 is limited because the air pipe 410 is fastened to the positioning groove 56, so that the second cover plate 55 remains stationary when the first sleeve 52 rotates. During the process of the first sleeve 52 driving the speed-increasing gear 510 to rotate together, the speed-increasing gear 510 will mesh with the first gear disk 54 and rotate inside the first sleeve 52. The rotating speed-increasing gear 510 meshes with the second gear disk 59 and speeds up it, so that the second sleeve 57 and the second gear disk 59 rotate at high speed on the outer wall of the round rod 53. When the second sleeve 57 rotates, it will cause the slide block 511 to slide back and forth on its outer wall through the bidirectional sliding groove 58. During the back and forth sliding process, the slide block 511 will be pulled by the traction rope 514 to the clamp 513 and the rubber belt 512, so that the rubber belt 512 will roll back and forth inside the first sleeve 52.

[0041] During the reciprocating rolling of the rubber belt 512 inside the first sleeve 52, the aluminum foil is in close contact with the outer wall of the first sleeve 52, and the rubber belt 512 is flush with the outer wall of the first sleeve 52. Therefore, the outer wall of the rubber belt 512 also abuts against the inner wall of the aluminum foil. By repeatedly scraping the inner wall of the aluminum foil with the rubber belt 512, the residual creases on the surface of the aluminum foil can be smoothed out, ensuring that the aluminum foil will not be affected by the presence of stripes during the winding process. By setting multiple rubber belts 512, it is ensured that the contact time between a single rubber belt 512 and the aluminum foil is short, avoiding the accumulation of dust on the surface of the aluminum foil due to static electricity. At the same time, by evenly distributing the contact time with the aluminum foil by multiple rubber belts 512, the problem of the cleaning effect deteriorating due to overheating of the rubber belt 512 due to friction can be effectively prevented.

[0042] like Figures 3 to 5 As shown, in a preferred embodiment of the present invention, the outer sterilization component 4 includes a light shield 45 fixedly connected to the outer wall of the support 1. Mirror panels 46 are evenly installed on the inner wall of the light shield 45. An irradiation opening 47 is provided at the bottom of the light shield 45. A first cover plate 48 is fastened to the side of the light shield 45 away from the support 1. The first cover plate 48 and the base 42 seal both ends of the glass sleeve 43. A fan 49 is installed on the inner wall of the first cover plate 48. An air duct 410 is fixedly connected to the outer wall of the first cover plate 48. The air outlet of the fan 49 and the air inlet of the air duct 410 are collinear.

[0043] like Figure 4 As shown, in another preferred embodiment of the present invention, a plurality of mirror panels 46 focus the ultraviolet light generated by the plasma generator 44 toward the irradiation opening 47.

[0044] like Figure 6 and Figure 7As shown, in another preferred embodiment of the present invention, the surface of the first sleeve 52 is uniformly provided with an air storage groove 521, and the surface of the first sleeve 52 is uniformly provided with an air injection groove 522, which is connected to the air storage groove 521. The outer wall of the first sleeve 52 and the interior of the air storage groove 521 are symmetrically fixedly connected with a directional disc 523, and the rubber belt 512 is rotatably connected to the directional disc 523.

[0045] In practical application, the first cover plate 48 and the base 42 seal the glass sleeve 43, ensuring that the plasma and ozone generated by the plasma generator 44 remain inside the glass sleeve 43. The plasma ionizes the air inside the glass sleeve 43, generating highly oxidizing free radicals and ozone. After the fan 49 is started, it draws the plasma and ozone from inside the glass sleeve 43 and injects them into the gas storage tank of the first sleeve 52 through the gas guide pipe 410. Inside 521, because the aluminum foil is attached to the surface of the first sleeve 52, the gas storage tank 521 is sealed by the aluminum foil. Therefore, the plasma and ozone will replace the original air inside the gas storage tank 521, so that the inner wall of the aluminum foil is efficiently sterilized under the combined action of plasma and ozone. This ensures that the side of the aluminum foil that is in direct contact with the drug can be highly sterilized. The sealed state allows the strong oxidizing free radicals to act efficiently on the surface of the aluminum foil, preventing the sterilization effect from being poor due to the escape of sterilization gas caused by external air turbulence.

[0046] like Figures 5 to 8 As shown, in another preferred embodiment of the present invention, a second cover plate 55 is fixedly connected to the end of the round rod 53 away from the first gear plate 54. A positioning groove 56 is provided on the surface of the second cover plate 55. The inner wall of the second cover plate 55 is in contact with the side of the first sleeve 52 away from the bracket 1. The side of the air guide pipe 410 away from the first cover plate 48 is engaged with the positioning groove 56. A speed-increasing gear 510 is rotatably connected inside the first sleeve 52. The speed-increasing gear 510 meshes with the first gear plate 54 and the second gear plate 59.

[0047] like Figure 7 As shown, in another preferred embodiment of the present invention, the rubber belts 512 are all located inside the air storage tank 521, and the outer wall of the rubber belts 512 is flush with the outer wall of the first sleeve 52.

[0048] like Figures 7 to 9 As shown, in another preferred embodiment of the present invention, a dust collection rack 515 is slidably connected inside the first sleeve 52. Dust collection grooves 516 are provided on the side of the dust collection rack 515 near the rubber belt 512. Springs 517 are uniformly fixedly connected between the middle part of the dust collection rack 515 and the slide block 511.

[0049] In practical application, when the slide block 511 slides on the second sleeve 57 toward the side closer to the second toothed disc 59, the top part of the rubber band 512 will move in the opposite direction to the slide block 511. By sliding the top part of the rubber band 512 back and forth, the inner wall of the aluminum foil can be scraped, leveled and cleaned.

[0050] When the slide block 511 moves laterally, it drives the dust collection frame 515 to slide together inside the first sleeve 52 via the spring 517. When the slide block 511 slides towards the first toothed disc 54, the dust collection frame 515 is pulled, causing the side of the dust collection frame 515 away from the first toothed disc 54 to compress the rubber belt 512. At this time, because the rubber belt 512 is in a sliding state, the dust collection groove 516 on the dust collection frame 515 will scrape the stains on the surface of the rubber belt 512, ensuring that the surface of the rubber belt 512 is clean when it comes into contact with the aluminum foil. Through the elastic deformation of the spring 517 when the slide block 511 slides back and forth, the dust collection frames 515 on both sides can be in a state where one side is not in contact with the rubber belt 512 and the other side is in a state of scraping the rubber belt 512 when the rubber belt 512 slides in different directions, thus improving the cleaning effect on the surface of the rubber belt 512.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A plasma sterilization device for pharmaceutical packaging materials, comprising a support (1), a worm gear (2), a motor (3), a flattening roller (6), and a take-up roller (7), wherein the worm gear (2) is rotatably connected to the back of the support (1), the motor (3) is mounted on the back of the support (1) and connected to the end of the worm gear (2), the flattening roller (6) is mounted on the surface of the support (1), and the take-up roller (7) is mounted on the surface of the support (1), characterized in that, Also includes: The outer sterilization component (4) is set on the support (1) and is used to sterilize the outside of the medical packaging material. The outer sterilization component (4) includes a first gear (41), a base (42), a glass sleeve (43) and a plasma generator (44). The first gear (41) is rotatably connected to the support (1) and meshes with the worm gear (2). The base (42) is fixedly connected to the surface of the first gear (41) and its side wall is evenly provided with air inlets. The plasma generator (44) is installed on the surface of the base (42). The glass sleeve (43) is sleeved on the outside of the plasma generator (44) and installed on the base (42). The inner sterilization component (5) is mounted on the support (1) and is used to sterilize the inside of the medical packaging material. The inner sterilization component (5) includes a second gear (51), a first sleeve (52), a round rod (53), a first gear disc (54), a second sleeve (57), a bidirectional slide (58), a slide block (511), a rubber belt (512), a clamp (513), and a traction rope (514). The second gear (51) is rotatably connected to the support (1) and meshes with the worm gear (2). The first sleeve (52) is fixedly connected to the surface of the second gear (51). The first gear disc (54) rotates. The first sleeve (52) is connected inside the round rod (53), which is fixedly connected to the surface of the first gear plate (54). The second sleeve (57) is rotatably connected to the outer wall of the round rod (53). The bidirectional sliding groove (58) is opened on the surface of the second sleeve (57). The slide block (511) is slidably connected to the outer wall of the second sleeve (57). The rubber belt (512) is uniformly rotatably connected to the outer wall of the first sleeve (52). The clamp (513) is fixedly connected to the outer wall of the rubber belt (512). The traction rope (514) is fixedly connected between the clamp (513) and the slide block (511). The surface of the first sleeve (52) is uniformly provided with air storage grooves (521), and the surface of the first sleeve (52) is uniformly provided with air injection grooves (522). The air injection grooves (522) are all connected to the air storage grooves (521). The outer wall of the first sleeve (52) and the interior of the air storage grooves (521) are symmetrically fixedly connected with directional discs (523). The rubber belt (512) is rotatably connected to the directional discs (523). The rubber strips (512) are all located inside the gas storage tank (521), and the outer wall of the rubber strips (512) is flush with the outer wall of the first sleeve (52).

2. The plasma sterilization equipment for pharmaceutical packaging materials according to claim 1, characterized in that, The outer sterilization component (4) includes a light shield (45) fixedly connected to the outer wall of the support (1). The inner wall of the light shield (45) is uniformly equipped with mirror panels (46). The bottom of the light shield (45) is provided with an irradiation opening (47). A first cover plate (48) is fastened to the side of the light shield (45) away from the support (1). The first cover plate (48) and the base (42) seal the two ends of the glass sleeve (43). A fan (49) is installed on the inner wall of the first cover plate (48). An air guide pipe (410) is fixedly connected to the outer wall of the first cover plate (48). The air outlet of the fan (49) and the air inlet of the air guide pipe (410) are collinear.

3. The plasma sterilization equipment for pharmaceutical packaging materials according to claim 2, characterized in that, The multiple mirror panels (46) focus the ultraviolet light generated by the plasma generator (44) toward the irradiation opening (47).

4. The plasma sterilization equipment for pharmaceutical packaging materials according to claim 2, characterized in that, The end of the round rod (53) away from the first gear disc (54) is fixedly connected to a second cover plate (55). The surface of the second cover plate (55) is provided with a positioning groove (56). The inner wall of the second cover plate (55) is in contact with the side of the first sleeve (52) away from the bracket (1). The side of the air guide pipe (410) away from the first cover plate (48) is engaged with the positioning groove (56). The inside of the first sleeve (52) is rotatably connected to a speed-increasing gear (510). The speed-increasing gear (510) meshes with the first gear disc (54) and the second gear disc (59).

5. A plasma sterilization device for pharmaceutical packaging materials according to claim 1, characterized in that, The first sleeve (52) is slidably connected to a dust collection rack (515). The dust collection rack (515) is provided with a dust collection groove (516) on the side near the rubber belt (512). A spring (517) is uniformly fixed between the middle of the dust collection rack (515) and the slide (511).

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