Protective lifting machine for carrying rubber products

Abstract

The invention relates to the field of lifting machines, in particular to a protective lifting machine for carrying rubber products. The device further comprises a suspender and the like. The connecting disc is fixedly connected with a suspender. When the telescopic end of the telescopic rod moves towards the side close to the inner wall of the tire, the telescopic end of the telescopic rod drives the scraping rod to move towards the side close to the side wall, after the rotating wheel is tightly attached to the inner wall of the tire, the scraping rod makes contact with the side wall, then the DD motor is controlled to be started, and the rotating rod drives the rotating wheel to rotate through an output shaft of the DD motor; the rotating wheel drives the tire to rotate under the action of friction force between the rotating wheel and the inner wall of the tire, then the side walls of the upper portion and the lower portion of the tire move relative to the scraping rods and the scraping pieces, then the scraping pieces scrape away burrs and impurities left on the side walls of the upper portion and the lower portion in the production and storage process at the same time, and the cleaning efficiency of the side walls is greatly improved.

Description

Technical Field

[0001] The invention relates to the field of cranes, and in particular to a protective crane for transporting rubber products. Background Art

[0002] Tires are common rubber products in production and life. During the production and storage process of tires, they need to be lifted from one place to another. Existing cranes are used to lift tires. For example, a Chinese patent with publication number: CN111545525B discloses a rubber tire impurity removal and lifting device dedicated to new energy vehicles. The lifting and impurity removal mechanism extends into the inner side of the rubber tire to lift the rubber tire. During the lifting process, the hollow ellipsoid drives the rubber tire to rotate, so as to achieve the purpose of absorbing dust inside the rubber tire. Due to the relative rotation of the hollow ellipsoid and the rubber tire, the dust can be more fully absorbed, and the impurities generated by processing on the upper side wall of the rubber tire can be scraped off by a scraper, further improving the impurity removal effect.

[0003] However, it can only clean impurities on the upper sidewall of the tire, but not on the lower sidewall of the tire, which greatly reduces the cleaning effect and requires subsequent manual cleaning of the lower sidewall of the tire. The process is cumbersome and the cleaning efficiency is low. Summary of the invention

[0004] In order to overcome the shortcomings of existing tire lifting equipment that can only clean impurities on the upper sidewall of the tire during lifting, but cannot clean impurities on the lower sidewall of the tire, resulting in low cleaning efficiency, the present invention provides a protective lifting machine for transporting rubber products.

[0005] Technical solution: A protective crane for handling rubber products, including a connecting plate; also including a suspension rod, a telescopic rod, a fixing ring, a DD motor, a rotating rod, a rotating wheel, an electric push rod I and a cleaning assembly; the connecting plate is fixedly connected to the suspension rod; the suspension rod is fixedly connected to an even number of telescopic rods; the fixed end of each telescopic rod is fixedly connected to an electric push rod I, and the telescopic end of the electric push rod I is fixedly connected to the telescopic end of the telescopic rod; the telescopic end of each telescopic rod is fixedly connected to a fixing ring; each fixing ring is fixedly connected to a DD motor; the output shaft of each DD motor is fixedly connected to a rotating rod; each rotating rod is connected to two rotating wheels; the telescopic end of each telescopic rod is connected to two cleaning assemblies for cleaning and polishing the sidewalls of tires.

[0006] In addition, it is particularly preferred that the cleaning assembly includes a connecting block, a scraper rod and a scraper blade; the telescopic end of each telescopic rod is connected to two connecting blocks; each connecting block is connected to a scraper rod; and each scraper rod is fixedly connected to a scraper blade.

[0007] In addition, it is particularly preferred that a spring rod is further included; the rotating wheel is slidably connected to the corresponding rotating rod, and a spline is provided on the rotating rod; a plurality of spring rods are fixedly connected to each of the two annular surfaces of the fixed ring, and the telescopic portion of the spring rod on the same annular surface is rotatably connected to the corresponding rotating wheel.

[0008] Furthermore, it is particularly preferred that the end surface of the rotating wheel is provided with an arc-shaped edge portion.

[0009] In addition, it is particularly preferred that a motor is further included; each connecting block is connected to a motor, and the output shaft of the motor is fixedly connected to the corresponding scraper rod.

[0010] In addition, it is particularly preferred that it also includes a connecting pipe and a hollow disk; the rotating wheel is hollow, and each rotating wheel is provided with a plurality of air injection holes; the rotating rod is hollow, and each rotating rod is provided with a plurality of circular holes, and the rotating rod is connected with the rotating wheel; each fixing ring is fixed with a plurality of connecting pipes; each rotating rod is rotatably connected with two hollow disks, and the hollow disks are hollow, and the hollow disks are connected with the corresponding connecting pipes, and the hollow disks are connected with the corresponding rotating rods.

[0011] In addition, it is particularly preferred that it also includes an electric push rod II, a push block, an electric push rod III and an elastic rod; the motor is slidably connected to the corresponding connecting block; the connecting block is slidably connected to the corresponding telescopic rod; the scraper rod is slidably connected to the corresponding connecting block; each connecting block is fixedly connected to an electric push rod II, and the telescopic end of the electric push rod II is fixedly connected to the motor; each connecting block is fixedly connected to an elastic rod; each telescopic end of the elastic rod is fixedly connected to a push block, and the push block is rotatably connected to the corresponding scraper rod; each fixed end of the telescopic rod is fixedly connected to an electric push rod III, and the telescopic end of the electric push rod III is fixedly connected to the corresponding connecting block.

[0012] Furthermore, it is particularly preferred that the push block is arranged in a conical shape.

[0013] Furthermore, it is particularly preferred that the upper and lower scraper bars are offset with respect to one another.

[0014] In addition, it is particularly preferred that a suction tube is further included; each push block is fixedly connected to a suction tube.

[0015] Beneficial effect: When the telescopic end of the telescopic rod of the present invention moves toward the side close to the inner wall of the tire, the telescopic end of the telescopic rod drives the scraper rod to move toward the side close to the side wall. After the rotating wheel is close to the inner wall of the tire, the scraper rod contacts the side wall. Subsequently, the DD motor is controlled to start, and the rotating rod drives the rotating wheel to rotate through the output shaft of the DD motor. The rotating wheel drives the tire to rotate under the action of the friction between the rotating wheel and the inner wall of the tire, and then the upper and lower side walls of the tire and the scraper rod and the scraper blade move relative to each other, and then the scraper blade simultaneously scrapes off the burr impurities remaining on the upper and lower side walls during the production and storage process, thereby greatly improving the cleaning efficiency of the side walls.

[0016] During the lifting process, the present invention controls the external air pump to start, and delivers gas to the hollow disk through the connecting pipe. The gas enters the rotating wheel from the rotating rod through the circular hole, and finally the gas is ejected from the air jet hole to blow away the dust and impurities attached to the inner wall of the tire.

[0017] When lifting a tire with a long distance between the inner wall and the side wall, the present invention controls the electric push rod III after the rotating wheel contacts the inner wall of the tire to make the connecting block drive the scraper rod and the scraper blade to move to the side close to the center of the tire until the scraper rod and the scraper blade contact the side wall, thereby making the scraper rod and the scraper blade adapt to tires of different models. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the first structure of the protective lifting machine for rubber product handling disclosed by the present invention;

[0019] Figure 2 A second structural schematic diagram of the protective lifting machine for handling rubber products disclosed in the present invention;

[0020] Figure 3 It is a schematic diagram of the combined partial structure of the telescopic rod, the fixing ring, the DD motor, the rotating rod, the rotating wheel, and the cleaning assembly disclosed by the protective lifting machine for handling rubber products of the present invention;

[0021] Figure 4 It is a schematic diagram of the combined partial structure of the fixing ring, DD motor, rotating rod, rotating wheel, spring rod, connecting pipe and hollow disk disclosed by the protective lifting machine for handling rubber products of the present invention;

[0022] Figure 5 The present invention is a schematic diagram of the partial structure of a scraper bar disclosed by the protective lifting machine for transporting rubber products.

[0023] In the figure: 1-connecting plate, 2-tire, 101-suspender rod, 102-telescopic rod, 103-fixing ring, 104-DD motor, 105-rotating rod, 106-rotating wheel, 107-spring rod, 108-motor, 109-connecting block, 1010-scraping rod, 1011-scraping blade, 1014-electric push rod I, 201-connecting pipe, 202-hollow plate, 301-electric push rod II, 302-push block, 303-electric push rod III, 304-suction pipe, 305-elastic rod, 21-side wall, 1006-edge portion, 1061-jet hole, 1051-circular hole. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0025] Example 1

[0026] A protective hoist for handling rubber products, such as Figure 1-Figure 5 As shown, it includes a connecting disk 1;

[0027] It also includes a suspension rod 101, a telescopic rod 102, a fixed ring 103, a DD motor 104, a rotating rod 105, a rotating wheel 106, an electric push rod Ⅰ1014 and a cleaning assembly; the connecting plate 1 is fixedly connected to the suspension rod 101; the suspension rod 101 is fixedly connected to an even number of telescopic rods 102; the fixed end of each telescopic rod 102 is fixedly connected to an electric push rod Ⅰ1014, and the telescopic end of the electric push rod Ⅰ1014 is fixedly connected to the telescopic end of the telescopic rod 102; the telescopic end of each telescopic rod 102 is fixedly connected to a fixing ring 103; each fixing ring 103 is fixedly connected to a DD motor 104; the output shaft of each DD motor 104 is fixedly connected to a rotating rod 105; each rotating rod 105 is connected to two rotating wheels 106; the telescopic end of each telescopic rod 102 is connected to two cleaning assemblies for cleaning and grinding the side wall 21 of the tire 2, and the cleaning assemblies located on the same telescopic rod 102 are symmetrically distributed up and down.

[0028] The cleaning assembly includes a connecting block 109 , a scraping rod 1010 and a scraping blade 1011 ; the telescopic end of each telescopic rod 102 is connected to two connecting blocks 109 ; each connecting block 109 is connected to a scraping rod 1010 ; each scraping rod 1010 is fixedly connected to a scraping blade 1011 .

[0029] It also includes a spring rod 107; the rotating wheel 106 is slidably connected to the corresponding rotating rod 105, and the rotating rod 105 is provided with a spline; a plurality of spring rods 107 are fixedly connected to each of the two annular surfaces of the fixed ring 103, and the telescopic portion of the spring rod 107 on the same annular surface is rotatably connected to the corresponding rotating wheel 106.

[0030] The end surface of the rotating wheel 106 is provided with an arc-shaped edge portion 1006 to reduce the squeezing of the end surface of the rotating wheel 106 on the tire 2 , thereby reducing the wear of the rotating wheel 106 on the tire 2 .

[0031] A motor 108 is also included; each connecting block 109 is connected to a motor 108 , and the output shaft of the motor 108 is fixedly connected to the corresponding scraper rod 1010 .

[0032] When in use, the connecting plate 1 is bolted to the external boom, and then the external boom is controlled to drive the connecting plate 1 and the boom 101 to move vertically downward along the center line of the horizontally placed tire 2 until the telescopic rod 102 is aligned with the inner middle part of the tire 2, and then the electric push rod Ⅰ1014 is controlled to move the telescopic end of the telescopic rod 102 and the parts thereon to the side close to the inner wall of the tire 2 until the rotating wheel 106 is close to the inner wall of the tire 2, and then the telescopic rod 102 and the rotating wheel 106 support the inner wall of the tire 2, and then the external boom is controlled to move the connecting plate 1 and the boom 101 upward, and the boom 101, the telescopic rod 102 and the rotating wheel 106 lift the tire 2 and move it to complete the lifting and transfer operation.

[0033] During the lifting and transfer process, when the telescopic end of the telescopic rod 102 moves toward the side close to the inner wall of the tire 2, the telescopic end of the telescopic rod 102 drives the scraper rod 1010 to move toward the side close to the side wall 21. After the rotating wheel 106 is close to the inner wall of the tire 2, the scraper rod 1010 contacts the side wall 21. Subsequently, the DD motor 104 is controlled to start, and the rotating rod 105 drives the rotating wheel 106 to rotate through the output shaft of the DD motor 104. The rotating wheel 106 drives the tire 2 to rotate under the friction between the inner wall of the tire 2, and then the upper and lower side walls 21 of the tire 2 and the scraper rod 1010 and the scraper blade 1011 move relative to each other, and then the scraper blade 1011 simultaneously scrapes off the burr impurities remaining on the upper and lower side walls 21 during the production and storage process, thereby greatly improving the cleaning efficiency of the side walls 21.

[0034] Since the tire widths of different batches of tires 2 are different, that is, the intervals between the two rotating wheels 106 located on the same telescopic rod 102 are different, when lifting tires 2 of different batches, after the two rotating wheels 106 enter the interior of the tire 2, the two rotating wheels 106 slide vertically along the rotating rod 105 under the elastic force of the spring rod 107 until the two rotating wheels 106 are tightly attached to the inner wall of the tire 2, thereby making the two rotating wheels 106 adapt to tires 2 of different widths and improving applicability.

[0035] And because the tire 2 is a rubber product with elasticity, when the fixed scraper rod 1010 and the scraper blade 1011 scrape the side wall 21 of the rotating tire 2, the friction between the scraper rod 1010 and the scraper blade 1011 and the side wall 21 is relatively large, which makes the scraper rod 1010 easily stuck and the side wall 21 is not scraped thoroughly. Therefore, when the scraper rod 1010 cleans the side wall 21, the control motor 108 is started, and the scraper rod 1010 and the scraper blade 1011 are driven to rotate by the output shaft of the motor 108, so that the scraper rod 1010 and the scraper blade 1011 rotate to grind and scrape the side wall 21, thereby improving the cleaning efficiency.

[0036] Example 2

[0037] On the basis of Example 1, Figure 3-Figure 4 As shown, it also includes a connecting pipe 201 and a hollow disk 202; the rotating wheel 106 is hollow, and each rotating wheel 106 is provided with a plurality of air injection holes 1061; the rotating rod 105 is hollow, and each rotating rod 105 is provided with a plurality of circular holes 1051, and the rotating rod 105 is connected with the rotating wheel 106; each fixing ring 103 is fixedly connected with two connecting pipes 201 distributed up and down; each rotating rod 105 is rotatably connected with two hollow disks 202, and the hollow disk 202 is hollow, and the hollow disk 202 is connected with the corresponding connecting pipe 201, and the hollow disk 202 is connected with the corresponding rotating rod 105.

[0038] The connecting pipe 201 conveys cold air.

[0039] The external air pump is connected to the connecting pipe 201. The inner wall of the tire 2 will be adhered to dust during storage. Therefore, the dust on the inner wall of the tire 2 needs to be cleaned to facilitate the tire 2 to enter the subsequent process and reduce the process of cleaning the dust on the tire 2. During the lifting process, the external air pump is controlled to start, and the gas is transported to the hollow disk 202 through the connecting pipe 201. The gas enters the rotating wheel 106 from the rotating rod 105 through the circular hole 1051, and finally the gas is ejected from the jet hole 1061 to blow away the dust and impurities adhered to the inner wall of the tire 2.

[0040] Since the tire 2 is a rubber product, the tire 2 is easily deformed when the rotating wheel 106 lifts the tire 2. Therefore, cold air is transported to the inside of the tire 2 through the connecting pipe 201 to quickly cool the inside of the tire 2, reduce the deformation degree of the tire 2, and improve the lifting stability.

[0041] Example 3

[0042] On the basis of Example 2, Figure 3 and Figure 5 As shown, it also includes an electric push rod II 301, a push block 302, an electric push rod III 303 and an elastic rod 305; the motor 108 is slidably connected to the corresponding connecting block 109; the connecting block 109 is slidably connected to the corresponding telescopic rod 102, and the scraper rod 1010 is slidably connected to the corresponding connecting block 109; each connecting block 109 is fixedly connected to an electric push rod II 301, and the telescopic end of the electric push rod II 301 is fixedly connected to the motor 108; each connecting block 109 is fixedly connected to an elastic rod 305; the telescopic end of each elastic rod 305 is fixedly connected to a push block 302, and the push block 302 is rotatably connected to the corresponding scraper rod 1010; the fixed end of each telescopic rod 102 is fixedly connected to an electric push rod III 303, and the telescopic end of the electric push rod III 303 is fixedly connected to the corresponding connecting block 109.

[0043] The push block 302 is arranged in a conical shape, thereby directing the debris impurities ground down by the scraper rod 1010 to a side close to the center of the tire 2 to prevent the debris impurities ground down from falling into the interior of the tire 2.

[0044] The scraping rods 1010 on the upper side and the lower side are staggered with each other; the scraping blades 1011 are arranged in a spiral shape.

[0045] A suction pipe 304 is also included; each push block 302 is fixedly connected to a suction pipe 304 .

[0046] The external pump is connected to the suction pipe 304. The distance between the inner wall of the tire 2 and the side wall 21 is different for different models of tires 2. When lifting a tire 2 with a longer distance between the inner wall of the tire 2 and the side wall 21, the telescopic rod 102 makes the rotating wheel 106 contact the inner wall of the tire 2. At this time, the scraper rod 1010 and the scraper blade 1011 will squeeze the side wall 21, causing the side wall 21 to deform and fail to play a grinding and scraping role. Therefore, after the rotating wheel 106 contacts the inner wall of the tire 2, the electric push rod III 303 is controlled to make the connecting block 109 drive the scraper rod 1010 and the scraper blade 1011 to move to the side close to the center of the tire 2 until the scraper rod 1010 and the scraper blade 1011 contact the side wall 21, thereby making the scraper rod 1010 and the scraper blade 1011 adapt to different models of tires 2.

[0047] At the same time, the distance between the upper side wall 21 and the lower side wall 21 of tires 2 of different models is also different, so when lifting a tire 2 with a longer distance between the upper side wall 21 and the lower side wall 21, the scraper rod 1010 and the scraper blade 1011 cannot contact the side wall 21, and also cannot play a grinding and scraping role. At this time, the electric push rod Ⅱ301 is controlled to make the motor 108 drive the scraper rod 1010 and the scraper blade 1011 to move toward the direction close to the side wall 21 until the scraper blade 1011 contacts the side wall 21.

[0048] Moreover, after the tire 2 has been stacked for a long time, the side wall 21 will deform inward, making it impossible for the scraper rod 1010 and the scraper blade 1011 to accurately fit the side wall 21. Therefore, the electric push rod II 301 is controlled to make the motor 108 drive the scraper rod 1010, the scraper blade 1011 and the push block 302 to move toward the side wall 21. The push block 302 pushes the side wall 21 outward under the elastic force of the elastic rod 305, so that during the rotation of the tire 2, the side wall 21 is always in contact with the scraper rod 1010 and the scraper blade 1011, thereby improving the grinding and scraping effect.

[0049] When the scraper rod 1010 grinds the side wall 21 of the tire 2, in order to ensure the grinding effect, the scraper rod 1010 needs to extend out of the side wall 21 for grinding. When multiple tires 2 are lifted at the same time, the upper and lower scraper rods 1010 in different tires 2 will collide with each other after contact, causing grinding obstruction. Therefore, the upper and lower scraper rods 1010 are staggered from each other, so that the grinding of the upper and lower scraper rods 1010 does not interfere with each other, thereby improving the overall grinding effect. In addition, since the scraper blade 1011 is arranged in a spiral shape, the scraper rod 1010 and the scraper blade 1011 are tightly attached to the side wall 21 when rotating and grinding. The scraper blade 1011 pulls the upper and lower side walls 21 of the tire 2 toward the middle, thereby increasing the gap between the multiple tires 2, so that the debris and impurities that fall into the gap between the tires 2 during the grinding and scraping process fall out.

[0050] During the process of grinding and scraping the side wall 21 by the scraper rod 1010 and the scraper blade 1011, debris will be generated. Therefore, it is also necessary to remove the debris generated by the grinding. Therefore, during the grinding process, the external pump is controlled to start and the suction pipe 304 is sucked. The debris and impurities generated by the grinding and scraping process are collected through the suction pipe 304 to prevent the debris and impurities generated by the grinding from floating around and causing pollution.

[0051] It should be understood that this embodiment is only used to illustrate the present invention and is not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope limited by the appended claims of the application.

Claims

1. A protective lifting machine for handling rubber products, comprising a connecting plate (1); wherein: The invention also comprises a suspension rod (101), a telescopic rod (102), a fixing ring (103), a DD motor (104), a rotating rod (105), a rotating wheel (106), an electric push rod I (1014) and a cleaning assembly; the connecting plate (1) is fixedly connected to the suspension rod (101); the suspension rod (101) is fixedly connected to an even number of telescopic rods (102); the fixed end of each telescopic rod (102) is fixedly connected to an electric push rod I (1014), and the telescopic end of the electric push rod I (1014) is connected to the telescopic rod ( The telescopic end of each telescopic rod (102) is fixedly connected to a fixing ring (103); each fixing ring (103) is fixedly connected to a DD motor (104); the output shaft of each DD motor (104) is fixedly connected to a rotating rod (105); each rotating rod (105) is connected to two rotating wheels (106); and the telescopic end of each telescopic rod (102) is connected to two cleaning components for cleaning and polishing the side wall (21) of the tire (2).

2. A protective lifting machine for handling rubber products according to claim 1, characterized in that: The cleaning assembly comprises a connecting block (109), a scraping rod (1010) and a scraping blade (1011); the telescopic end of each telescopic rod (102) is connected to two connecting blocks (109); each connecting block (109) is connected to a scraping rod (1010); and each scraping rod (1010) is fixedly connected to a scraping blade (1011).

3. A protective lifting machine for handling rubber products according to claim 1, characterized in that: The invention also comprises a spring rod (107); the rotating wheel (106) is slidably connected to the corresponding rotating rod (105), and the rotating rod (105) is provided with a spline; a plurality of spring rods (107) are fixedly connected to the two annular surfaces of the fixing ring (103), and the telescopic parts of the spring rods (107) on the same annular surface are rotatably connected to the corresponding rotating wheel (106).

4. A protective lifting machine for handling rubber products according to claim 1, characterized in that: The end surface of the rotating wheel (106) is provided with an arc-shaped edge portion (1006).

5. A protective lifting machine for handling rubber products according to claim 1, characterized in that: It also includes a motor (108); each connection block (109) is connected to a motor (108), and the output shaft of the motor (108) is fixedly connected to the corresponding scraper rod (1010).

6. A protective lifting machine for handling rubber products according to claim 1, characterized in that: The invention also comprises a connecting pipe (201) and a hollow disk (202); the rotating wheel (106) is hollow, and each rotating wheel (106) is provided with a plurality of air injection holes (1061); the rotating rod (105) is hollow, and each rotating rod (105) is provided with a plurality of circular holes (1051), and the rotating rod (105) is connected to the rotating wheel (106); each fixing ring (103) is fixedly connected with a plurality of connecting pipes (201); each rotating rod (105) is rotatably connected with two hollow disks (202), and the hollow disks (202) are hollow, and the hollow disks (202) are connected with the corresponding connecting pipes (201), and the hollow disks (202) are connected with the corresponding rotating rods (105).

7. A protective lifting machine for handling rubber products according to claim 5, characterized in that: The invention also includes an electric push rod II (301), a push block (302), an electric push rod III (303) and an elastic rod (305); the motor (108) is slidably connected to the corresponding connecting block (109); the connecting block (109) is slidably connected to the corresponding telescopic rod (102); the scraper rod (1010) is slidably connected to the corresponding connecting block (109); each connecting block (109) is fixedly connected to an electric push rod II (301), and the electric push rod II (301) The telescopic end of each telescopic rod (102) is fixedly connected to the motor (108); each connection block (109) is fixedly connected to an elastic rod (305); the telescopic end of each elastic rod (305) is fixedly connected to a push block (302), and the push block (302) is rotatably connected to the corresponding scraper rod (1010); the fixed end of each telescopic rod (102) is fixedly connected to an electric push rod III (303), and the telescopic end of the electric push rod III (303) is fixedly connected to the corresponding connection block (109).

8. A protective lifting machine for handling rubber products according to claim 7, characterized in that: The push block (302) is arranged in a cone shape.

9. A protective lifting machine for handling rubber products according to claim 1, characterized in that: The scraping rods (1010) on the upper side and the lower side are staggered with each other.

10. A protective lifting machine for handling rubber products according to claim 7, characterized in that: It also includes a suction tube (304); each push block (302) is fixedly connected to a suction tube (304).

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