Crushing processing equipment for straw recycling

Abstract

The invention relates to the technical field of crushing processing, and particularly discloses crushing processing equipment for straw recycling, which comprises a conveying device, a slitting support and a crushing support, the slitting support is fixedly mounted between the conveying device and the crushing support, a slitting assembly is arranged in the slitting support, a crushing assembly is arranged in the crushing support, and the slitting assembly is fixedly mounted in the crushing support. The slitting assembly comprises a slitting mechanism, a transmission mechanism and a screening mechanism. The compression roller is installed in the crushing support through the movable seat in a revolute pair mode and is driven by the first motor to do fixed-axis rotation, the compression roller rolls straw during rotation, the compression roller and the slitting blade cooperate to slit the straw, the crushing difficulty is reduced, and the crushing efficiency is improved. Before slitting operation, the pressing roller drives the screening base and the screening mechanism to reciprocate in the horizontal direction by means of sliding connection of the push plate and the sliding rod, straw shakes in the crushing support, impurities such as stones in the straw are screened out, the pressing roller and the slitting blades are prevented from being damaged, and the service life of the pressing roller and the slitting blades is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of crushing processing, and in particular to crushing processing equipment for straw recycling. Background Art

[0002] In the agricultural field, straw recycling has multiple benefits. It can not only improve the soil and increase soil fertility, but also be processed into feed, reduce breeding costs, and promote the development of animal husbandry. Hammer crusher is a commonly used equipment for straw crushing and recycling. When working, the equipment uses high-speed rotating hammers to hit and tear the straw, and then screens it through a screen to make the straw broken more evenly, thereby ensuring the quality and efficiency of straw recycling.

[0003] In the straw crushing operation scenario, the existing hammer crusher relies on a conveying device to guide the straw into the equipment for crushing. However, the straw is generally long and is very easy to be entangled and piled up during the transportation process. This not only blocks the feed port of the crusher, hinders the straw from entering the equipment smoothly, and reduces work efficiency, but also causes the straw entering the crusher to be difficult to be fully hit and torn by the hammer due to entanglement, resulting in uneven crushing effect and seriously affecting the crushing quality.

[0004] Therefore, it is necessary to provide a crushing and processing equipment for straw recycling to solve the above problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a crushing and processing equipment for straw recycling, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is: A crushing and processing device for straw recycling, comprising a conveying device, a slitting bracket and a crushing bracket, wherein the slitting bracket is fixedly installed between the conveying device and the crushing bracket, a slitting component is arranged inside the slitting bracket, a crushing component is arranged inside the crushing bracket, and the slitting component comprises a slitting mechanism, a transmission mechanism and a screening mechanism; The slitting mechanism comprises a movable seat symmetrically and slidably connected to the inside of the slitting bracket, the two movable seats are rotatably connected to the inside of the mounting shaft, the outside of the mounting shaft is fixedly connected to a pressure roller, the inside of the pressure roller is slidably connected to four slitting blades, a spring is fixedly connected between one end of the slitting blade close to the mounting shaft and the inner wall of the slitting blade, the outside of the slitting blade is symmetrically and fixedly connected to a guide rod, the guide rod is slidably connected to the inside of the movable seat, and the outside of the pressure roller is evenly provided with pressure grooves; The screening mechanism includes a screening seat and a push plate slidably connected to the slitting bracket, a fixed seat is symmetrically fixedly connected to the outer side of the slitting bracket, a spring 2 is fixedly connected between the screening seat and the fixed seat, a unloading seat is fixedly connected to the bottom of the slitting bracket, a sliding rod is fixedly connected to the top of the screening seat, the sliding rod is slidably connected to the inside of the push plate, one end of the push plate close to the pressure roller is slidably connected to the pressure groove, and a screening plate is evenly fixedly connected to the bottom of the screening seat.

[0007] As a further improvement of the above scheme, the crushing assembly includes a crushing mechanism, a shredding mechanism and a support seat, the support seat is fixedly connected to the bottom of the crushing bracket, the crushing mechanism includes a driving roller rotatably connected to the inside of the crushing bracket, the outer side of the driving roller is symmetrically fixedly connected with a driving disk, the two driving disks are evenly fixedly connected with an installation roller and a support roller, the outer side of the installation roller is evenly rotatably installed with a crushing hammer, and the top of the support seat is fixedly connected with a toothed plate.

[0008] As a further improvement of the above solution, a worm is symmetrically rotatably mounted on the outer side of the crushing bracket, a worm wheel is symmetrically fixedly connected to the outer side of the mounting shaft, and the worm wheel and the worm are meshed with each other.

[0009] As a further improvement of the above solution, one end of the slitting blade close to the mounting shaft is also fixedly connected to a limiting rod, and the limiting rod passes through the spring and is slidably connected to the inside of the pressure roller.

[0010] As a further improvement of the above scheme, the transmission mechanism includes a driving shaft and a transmission chain. The driving shaft is rotatably connected to the top of the crushing bracket, the bottom of the driving shaft is fixedly connected to a driving wheel, the tops of the two worm gears are fixedly connected to a driven wheel, and the transmission chain is transmission-connected between the driving wheel and the two driven wheels.

[0011] As a further improvement of the above scheme, motor 1 is fixedly installed on the top of the slitting bracket, motor 2 is fixedly connected to the outside of the crushing bracket, the driving shaft is fixedly connected to the output shaft of motor 1 through a coupling, the driving roller is fixedly connected to the output shaft of motor 2 through a coupling, and a guide sleeve is fixedly installed on the top of the conveying device.

[0012] As a further improvement of the above scheme, the silk kneading mechanism includes a silk kneading seat and a silk kneading plate, the silk kneading seat is fixedly connected to the outer side of the support seat, the four corners of the top of the silk kneading plate are fixedly connected to sliding seats, the outer side of the sliding seat is slidably connected to a connecting seat, four connecting rollers are rotatably installed inside the crushing bracket, one end of the connecting roller located in the crushing bracket is fixedly connected to a rotating block, the connecting seat and the rotating block are rotatably connected, the bottom of the sliding seat is fixedly connected to a protective seat, and a spring three is fixedly connected between the protective seat and the connecting seat.

[0013] As a further improvement of the above solution, a transmission wheel is fixedly connected to the outer side of the driving roller and the connecting roller, and a transmission belt is connected between the two transmission wheels.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The pressure roller is installed in the crushing bracket in the form of a rotating pair through a movable seat. It rotates on a fixed axis under the drive of a motor. When rotating, the pressure roller crushes the straw and cooperates with the slitting blade to cut the straw, reducing the difficulty of crushing and improving the crushing efficiency. Before the slitting operation, the pressure roller uses the sliding connection between the push plate and the slide rod to drive the screening seat and the screening mechanism to move back and forth in the horizontal direction, allowing the straw to shake in the crushing bracket to screen out impurities such as stones inside, avoiding damage to the pressure roller and the slitting blade, and extending their service life.

[0015] When the driving roller is running, it drives the crushing hammers on the outside of the installation roller to rotate synchronously. Under the action of the centrifugal force generated by the high-speed rotation, the crushing hammers hit the straw and push the straw to collide with the toothed plate to achieve straw crushing and improve the crushing quality. Subsequently, the straw is thrown between the silk kneading plate and the support seat, and the silk kneading process is completed under the joint action of the silk kneading plate and the silk kneading seat, further improving the crushing quality of the straw. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall back structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the cutting bracket and the crushing bracket of the present invention; Figure 4 This is a schematic diagram of the internal structure of the cutting bracket of the present invention; Figure 5 It is a structural schematic diagram of the screening mechanism of the present invention; Figure 6 It is a schematic diagram of the internal structure of the pressure roller of the present invention; Figure 7 It is a structural schematic diagram of the movable seat of the present invention; Figure 8 This is a schematic diagram of the internal structure of the crushing support of the present invention; Fig. 9 It is a partial structural schematic diagram of the crushing mechanism of the present invention; Fig.10 It is a partial structural schematic diagram of the silk kneading mechanism of the present invention.

[0018] In the figure: 1, conveying device; 2, slitting bracket; 3, crushing bracket; 4, guide sleeve; 5, motor 1; 6, motor 2; 7, slitting assembly; 71, slitting mechanism; 711, movable seat; 712, mounting shaft; 713, pressure roller; 714, worm; 715, slitting blade; 716, limit rod; 717, spring 1; 718, worm wheel; 719, guide rod; 72, transmission mechanism; 721, driving shaft; 722, driving wheel; 723, transmission chain; 724, driven wheel; 73, screening mechanism; 731, unloading seat; 732, screening seat; 73 3. Fixed seat; 734. Push plate; 735. Slide bar; 736. Spring 2; 737. Screening plate; 8. Crushing assembly; 81. Crushing mechanism; 811. Driving disc; 812. Driving roller; 813. Mounting roller; 814. Crushing hammer; 815. Support roller; 816. Toothed plate; 82. Thread kneading mechanism; 821. Connecting roller; 822. Thread kneading seat; 823. Thread kneading plate; 824. Slide seat; 825. Connecting seat; 826. Rotating block; 827. Protective seat; 828. Spring 3; 83. Support seat; 841. Transmission belt; 842. Transmission wheel. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figures 1 to 9 As shown, the present invention provides an embodiment: A crushing and processing device for recycling straw, comprising a conveying device 1, a slitting support 2 and a crushing support 3, wherein the slitting support 2 is fixedly installed between the conveying device 1 and the crushing support 3, a slitting assembly 7 is arranged inside the slitting support 2, a crushing assembly 8 is arranged inside the crushing support 3, and the slitting assembly 7 comprises a slitting mechanism 71, a transmission mechanism 72 and a screening mechanism 73; The slitting mechanism 71 includes a movable seat 711 symmetrically slidably connected to the inside of the slitting bracket 2, the two movable seats 711 are rotatably connected to the inside of the mounting shaft 712, the outer side of the mounting shaft 712 is fixedly connected to a pressure roller 713, the inner side of the pressure roller 713 is slidably connected to four slitting blades 715, a spring 717 is fixedly connected between one end of the slitting blade 715 close to the mounting shaft 712 and the inner wall of the slitting blade 715, the outer side of the slitting blade 715 is symmetrically fixedly connected to a guide rod 719, the guide rod 719 is slidably connected to the inside of the movable seat 711, and the outer side of the pressure roller 713 is uniformly provided with pressure grooves; The screening mechanism 73 includes a screening seat 732 and a push plate 734 which are slidably connected to the slitting bracket 2. The outer side of the slitting bracket 2 is symmetrically fixedly connected with a fixed seat 733. A spring 736 is fixedly connected between the screening seat 732 and the fixed seat 733. A material discharge seat 731 is fixedly connected to the bottom of the slitting bracket 2. A slide bar 735 is fixedly connected to the top of the screening seat 732. The slide bar 735 is slidably connected to the inside of the push plate 734. One end of the push plate 734 close to the pressing roller 713 is slidably connected to the pressing groove. A screening plate 737 is evenly fixedly connected to the bottom of the screening seat 732. A worm 714 is symmetrically rotatably mounted on the outer side of the crushing bracket 3, and a worm wheel 718 is symmetrically fixedly connected to the outer side of the mounting shaft 712, and the worm wheel 718 and the worm 714 are meshed with each other; The transmission mechanism 72 includes a driving shaft 721 and a transmission chain 723. The driving shaft 721 is rotatably connected to the top of the crushing bracket 3. The bottom of the driving shaft 721 is fixedly connected to a driving wheel 722. The tops of the two worms 714 are fixedly connected to a driven wheel 724. The transmission chain 723 is transmission-connected between the driving wheel 722 and the two driven wheels 724. A motor 5 is fixedly installed on the top of the slitting bracket 2, a motor 2 6 is fixedly connected to the outer side of the crushing bracket 3, the driving shaft 721 is fixedly connected to the output shaft of the motor 5 through a coupling, and a guide sleeve 4 is fixedly installed on the top of the conveying device 1.

[0021] In practical application, the embodiment of the present invention is as follows: Figure 4 As shown, the motor 5 is started, and the driving shaft 721 is driven to rotate through the coupling, and the driving wheel 722 at the bottom of the driving shaft 721 rotates synchronously, and the driven wheel 724 drives the worm 714 to operate, and the worm 714 is meshed with the worm wheel 718 to drive the installation shaft 712 to rotate in the movable seat 711, thereby realizing the operation of the pressure roller 713; like Figures 1 to 5As shown, the straw is transported by the conveying device 1, passes through the guide sleeve 4 and enters the slitting bracket 2. During the rotation of the pressing roller 713, the push plate 734 moves along with the pressing groove on the surface of the pressing roller 713, and drives the screening seat 732 to slide back and forth in the slitting bracket 2 through the sliding rod 735. The screening plate 737 at the bottom of the screening seat 732 shakes synchronously to screen out impurities such as stones mixed in the straw, and the impurities are discharged through the unloading seat 731. like Figures 1 to 7 As shown, the slitting blade 715 inside the pressing roller 713 slides radially along the mounting shaft 712 under the action of the spring 1 717 and the inner wall of the pressing roller 713. The slitting blade 715 is slidably connected with the movable seat 711 through the guide rod 719 to ensure a stable motion trajectory. When the straw is crushed by the pressing roller 713, the slitting blade 715 slides outward along the inner wall of the pressing roller 713 under the action of the restoring force of the spring 1 717 to slit the straw and reduce the length of the straw to prepare for subsequent crushing. like Figure 1 and Figure 2 As shown, the cut straw enters the crushing support 3, the motor 2 6 is started, and the crushing component 8 is driven to crush the straw, which effectively improves the efficiency and quality of straw recycling and processing, and realizes efficient recycling of the straw.

[0022] like Figure 1 , Figure 2 , Figure 8 and Fig. 9 As shown, the crushing assembly 8 includes a crushing mechanism 81, a shredding mechanism 82 and a support seat 83. The support seat 83 is fixedly connected to the bottom of the crushing bracket 3. The crushing mechanism 81 includes a driving roller 812 rotatably connected to the inside of the crushing bracket 3. The outer side of the driving roller 812 is symmetrically fixedly connected with a driving disk 811. The two driving disks 811 are evenly fixedly connected with a mounting roller 813 and a supporting roller 815. The outer side of the mounting roller 813 is evenly rotatably mounted with a crushing hammer piece 814. The top of the support seat 83 is fixedly connected with a toothed plate 816. The driving roller 812 is fixedly connected to the output shaft of the motor 26 through a coupling.

[0023] In actual application of the embodiment of the present invention, after the straw is cut and processed and enters the crushing support 3, the motor 26 is started, and the driving roller 812 is driven to rotate around its axis through the coupling. During the rotation of the driving roller 812, the driving disc 811 fixedly connected thereto rotates synchronously, thereby driving the installation roller 813 and the support roller 815 to make a circular motion. When the installation roller 813 moves, the crushing hammer piece 814 installed on the outer side thereof is affected by the centrifugal force, expands radially, and moves with the circular motion of the installation roller 813 to crush the straw. High-speed striking. During the striking process, the straw collides with the toothed plate 816 under the push of the crushing hammer 814. The dual effects of the striking of the crushing hammer 814 and the collision of the toothed plate 816 cause the straw to be initially crushed. The initially crushed straw is thrown by the crushing hammer 814 into the gap between the kneading mechanism 82 and the support seat 83, and the kneading mechanism 82 kneads the straw to further refine the straw, improve the quality and uniformity of the straw crushing, and finally realize the whole processing flow of straw recycling.

[0024] like Figure 6 As shown, one end of the slitting blade 715 close to the mounting shaft 712 is also fixedly connected to a limiting rod 716, which passes through a spring 717 and is slidably connected to the inside of the pressure roller 713.

[0025] When the embodiment of the present invention is actually used, the limit rod 716 passes through the spring 717 and slides inside the pressure roller 713, providing a stable guide for the extension and retraction of the slitting blade 715, ensuring that the slitting blade 715 will not deviate or get stuck when moving along the mounting axis 712, making the slitting action smoother.

[0026] like Figure 1 , Figure 2 , Figure 8 and Fig.10 As shown, the silk kneading mechanism 82 includes a silk kneading seat 822 and a silk kneading plate 823, the silk kneading seat 822 is fixedly connected to the outer side of the support seat 83, the four corners of the top of the silk kneading plate 823 are fixedly connected with sliding seats 824, the outer side of the sliding seat 824 is slidably connected with a connecting seat 825, four connecting rollers 821 are rotatably installed inside the crushing bracket 3, one end of the connecting roller 821 located in the crushing bracket 3 is fixedly connected with a rotating block 826, the connecting seat 825 is rotatably connected to the rotating block 826, the bottom of the sliding seat 824 is fixedly connected with a protective seat 827, a spring three 828 is fixedly connected between the protective seat 827 and the connecting seat 825, a driving roller 812 and the outer side of the connecting roller 821 are fixedly connected with a transmission wheel 842, and a transmission belt 841 is transmission-connected between the two transmission wheels 842.

[0027] In actual application of the embodiment of the present invention, the initially crushed straw is thrown into the gap between the kneading mechanism 82 and the support seat 83. At this stage, the driving roller 812 continues to operate. Since the driving roller 812 and the transmission wheel 842 on the outer side of the connecting roller 821 are connected by the transmission belt 841, the rotation of the driving roller 812 will drive the connecting roller 821 to rotate synchronously. When the connecting roller 821 rotates, the rotating block 826 fixed at its end makes a circular motion. Since the rotating block 826 is rotatably connected with the connecting seat 825, the connecting seat 825 rotates on the rotating block 826. The connecting seat 825 is slidably connected to the sliding seat 824, and the sliding seat 824 will move accordingly, thereby driving the kneading plate 823 to reciprocate. During the movement of the kneading plate 823, the spring three 828 plays a buffering and pressing role between the protective seat 827 and the connecting seat 825, ensuring the movement stability of the kneading plate 823. The kneading plate 823 cooperates with the kneading seat 822 to rub and stretch the straw entering therebetween, thereby achieving fine kneading of the straw and improving the efficiency and quality of straw recycling.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A crushing and processing equipment for straw recycling, characterized in that: The invention comprises a conveying device (1), a slitting support (2) and a crushing support (3); the slitting support (2) is fixedly installed between the conveying device (1) and the crushing support (3); a slitting assembly (7) is arranged inside the slitting support (2); a crushing assembly (8) is arranged inside the crushing support (3); the slitting assembly (7) comprises a slitting mechanism (71), a transmission mechanism (72) and a screening mechanism (73); The slitting mechanism (71) comprises a movable seat (711) symmetrically slidably connected to the inside of the slitting bracket (2); the two movable seats (711) are rotatably connected to the inside of the mounting shaft (712); the outer side of the mounting shaft (712) is fixedly connected to a pressure roller (713); the inner side of the pressure roller (713) is slidably connected to four slitting blades (715); a spring 1 (717) is fixedly connected between one end of the slitting blade (715) close to the mounting shaft (712) and the inner wall of the slitting blade (715); the outer side of the slitting blade (715) is symmetrically fixedly connected to a guide rod (719); the guide rod (719) is slidably connected to the inside of the movable seat (711); and the outer side of the pressure roller (713) is evenly provided with pressure grooves; The screening mechanism (73) comprises a screening seat (732) and a push plate (734) slidably connected to the inside of the slitting bracket (2); the outer side of the slitting bracket (2) is symmetrically fixedly connected to the fixed seat (733); a spring 2 (736) is fixedly connected between the screening seat (732) and the fixed seat (733); the bottom of the slitting bracket (2) is fixedly connected to a feeding seat (731); the top of the screening seat (732) is fixedly connected to a sliding rod (735); the sliding rod (735) is slidably connected to the inside of the push plate (734); one end of the push plate (734) close to the pressing roller (713) is slidably connected to the pressing groove; and the bottom of the screening seat (732) is evenly fixedly connected to a screening plate (737).

2. The crushing and processing equipment for straw recycling according to claim 1 is characterized in that: The crushing assembly (8) comprises a crushing mechanism (81), a shredding mechanism (82) and a support seat (83); the support seat (83) is fixedly connected to the bottom of the crushing support (3); the crushing mechanism (81) comprises a driving roller (812) rotatably connected to the inside of the crushing support (3); a driving disk (811) is symmetrically fixedly connected to the outside of the driving roller (812); a mounting roller (813) and a supporting roller (815) are evenly fixedly connected between the two driving disks (811); a crushing hammer (814) is evenly rotatably mounted on the outside of the mounting roller (813); and a toothed plate (816) is fixedly connected to the top of the support seat (83).

3. The crushing and processing equipment for straw recycling according to claim 2 is characterized in that: A worm (714) is symmetrically rotatably mounted on the outer side of the crushing bracket (3), and a worm wheel (718) is symmetrically fixedly connected to the outer side of the mounting shaft (712), wherein the worm wheel (718) and the worm (714) are meshed with each other.

4. The crushing and processing equipment for straw recycling according to claim 2 is characterized in that: One end of the slitting blade (715) close to the mounting shaft (712) is also fixedly connected to a limiting rod (716), and the limiting rod (716) passes through spring 1 (717) and is slidably connected to the interior of the pressure roller (713).

5. The crushing and processing equipment for straw recycling according to claim 3 is characterized in that: The transmission mechanism (72) comprises a driving shaft (721) and a transmission chain (723); the driving shaft (721) is rotatably connected to the top of the crushing support (3); the bottom of the driving shaft (721) is fixedly connected to a driving wheel (722); the tops of the two worms (714) are each fixedly connected to a driven wheel (724); and the transmission chain (723) is transmission-connected between the driving wheel (722) and the two driven wheels (724).

6. The crushing and processing equipment for straw recycling according to claim 5, characterized in that: A motor 1 (5) is fixedly mounted on the top of the slitting bracket (2), a motor 2 (6) is fixedly connected to the outer side of the crushing bracket (3), the driving shaft (721) is fixedly connected to the output shaft of the motor 1 (5) via a coupling, the driving roller (812) is fixedly connected to the output shaft of the motor 2 (6) via a coupling, and a guide sleeve (4) is fixedly mounted on the top of the conveying device (1).

7. The crushing and processing equipment for straw recycling according to claim 2, characterized in that: The silk kneading mechanism (82) comprises a silk kneading seat (822) and a silk kneading plate (823); the silk kneading seat (822) is fixedly connected to the outer side of the support seat (83); the top four corners of the silk kneading plate (823) are fixedly connected to sliding seats (824); the outer side of the sliding seat (824) is slidably connected to a connecting seat (825); four connecting rollers (821) are rotatably installed inside the crushing bracket (3); one end of the connecting roller (821) located inside the crushing bracket (3) is fixedly connected to a rotating block (826); the connecting seat (825) and the rotating block (826) are rotatably connected; the bottom of the sliding seat (824) is fixedly connected to a protective seat (827); a spring three (828) is fixedly connected between the protective seat (827) and the connecting seat (825).

8. The crushing and processing equipment for straw recycling according to claim 7, characterized in that: The outer sides of the driving roller (812) and the connecting roller (821) are both fixedly connected to a transmission wheel (842), and a transmission belt (841) is transmission-connected between the two transmission wheels (842).

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