Biomass raw material forming machine

Abstract

The invention discloses a biomass raw material forming machine which comprises shredding equipment and forming equipment located below the shredding equipment, the shredding equipment is used for shredding biomass raw materials and feeding the shredded raw materials into the forming equipment from a discharging hopper, and the forming equipment comprises a forming unit and a discharging unit, the forming screw rod is mounted in the forming cylinder, and the shredded materials are extruded into formed materials in the spiral rotation process of the forming screw rod; and the cutting knife is arranged at a position with a set distance outside the discharge port of the forming cylinder and is used for cutting the forming material into biomass briquettes with set lengths after the forming screw pushes the forming material out of the forming cylinder. The problems that biomass raw materials are difficult to collect, high in transportation cost and difficult to store are solved, the collection, storage and transportation cost is greatly saved, and standardization, commercialization and marketization circulation of the biomass raw materials are facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of material crushing and molding, and in particular relates to a biomass raw material molding machine. Background Art

[0002] Biomass raw materials have a high moisture content when they are collected. In the traditional mode, when a large amount of biomass raw materials are piled together, air cannot circulate and anaerobic fermentation begins. At the same time, the internal temperature continues to rise, and the pile needs to be turned over continuously. In such an environment, the biomass raw materials are seriously moldy, resulting in the calorific value of the biomass raw materials being greatly reduced during storage. After long-term stacking, the calorific value is even less than half of the original.

[0003] The bulk density of biomass raw materials is very small, and a large amount of storage requires a very large site. The conditions of biomass raw materials growing areas are relatively complex, and it is impossible to achieve deep processing such as granulation on site. The cost of direct long-distance transportation is also very high. If it is transported to a nearby factory for granulation, the cost will double. Therefore, the market circulation cost of biomass raw materials is very high, which seriously restricts the development of biomass energy industrialization.

[0004] Therefore, how to form biomass raw materials into a dense shape that is easy to stack is a problem to be solved. The existing technology usually only has a single shredder or crusher, which is unable to process biomass raw materials into a dense shape that is easy to stack, and common straw balers are unable to bale other woody biomass raw materials into shape.

[0005] In view of this, it is necessary to develop a device that can shred and briquette in one. Summary of the invention

[0006]

Technical issues

[0007] The biomass raw material forming machine of the present application mainly solves the problems of difficult collection, high transportation cost and difficult storage of biomass raw materials, greatly saves the cost of collection, storage and transportation, and is conducive to the standardization, commercialization and market circulation of biomass raw materials.

[0008]

Technical solution

[0009] A biomass raw material molding machine comprises a shredding device and a molding device located below the shredding device, wherein the shredding device is used to shred the biomass raw material and feed the shredded raw material into the molding device from a discharge hopper, and the molding device comprises:

[0010] The molding unit comprises a molding barrel and a molding screw, wherein the molding screw is installed in the molding barrel and extrude the shredded material into molding material during the spiral rotation of the molding screw;

[0011] The cutting knife is arranged at a set distance outside the discharge port of the forming cylinder, and is used to cut the forming material into biomass briquettes of set length after the forming screw pushes the forming material out of the forming cylinder.

[0012] Optionally, the forming cylinder includes a compression zone, a forming zone and a shape-retaining zone connected in sequence, the compression zone is a gradually shrinking cone along the pushing direction, the inner diameter of the forming zone is the same as the conical small diameter end of the compression zone, and the shape-retaining zone is 2-20 mm larger than the inner diameter of the forming zone.

[0013] Optionally, the molding screw is conical or cylindrical, and the molding screw is a multi-start screw.

[0014] Optionally, a material guide bracket is installed in the forming cylinder, and the material guide bracket includes a support ring and a support rod. One end of the forming screw facing the discharge port is radially fixedly connected with a plurality of support rods, and the radial outer end of the support rod is fixedly connected to the support ring, and the outer diameter of the support ring is the same as the inner diameter of the forming cylinder.

[0015] Optionally, the shredding equipment includes a first main shaft and a second main shaft arranged in parallel and staggered, a plurality of first movable knives are axially spaced apart on the outer circumference of the first main shaft, and a plurality of second movable knives are axially spaced apart on the outer circumference of the second main shaft, the positions of the movable knives on the first main shaft and the second main shaft are axially staggered, and the movable knives extend into the interval space between the movable knives of the other main shaft, the first main shaft and the second main shaft rotate inwardly in opposite directions to shred and shear the material, and the rotational speeds of the first main shaft and the second main shaft are different.

[0016] Optionally, a stationary knife is further provided in the shredding device. The stationary knife is installed on the inner wall of the shredding device and has a fixed gap with the first moving knife and the second moving knife. The material on the moving knife is scraped off by the stationary knife.

[0017] Optionally, the cross section of the forming cylinder is a circular cross section.

[0018] Optionally, a shearing tool is provided on the inner side of the lower end of the discharge hopper of the shredding device.

[0019] Optionally, a first gear and a second gear are fixedly connected at both ends of the second main shaft, a third gear and a fourth gear are fixedly connected at both ends of the first main shaft, an output shaft of the third motor is connected to the third reducer, an output shaft of the third reducer is connected to the first gear, the first gear is meshed with the third gear, and the second gear is meshed with the fourth gear.

[0020] Optionally, the shredding device includes a first motor and a second motor, the output shaft of the first motor is connected to one end of the first coupling, the other end of the first coupling is connected to the input shaft of the first reducer, the output shaft of the first reducer is connected to one end of the second coupling, and the other end of the second coupling is connected to the first main shaft;

[0021] The output shaft of the second motor is connected to one end of the third coupling, the other end of the third coupling is connected to the input shaft of the second reducer, the output shaft of the second reducer is connected to one end of the fourth coupling, and the other end of the fourth coupling is connected to the second main shaft.

[0022]

Technical Effect

[0023] (1) When biomass raw materials are collected, due to their very low stacking density, a large amount of storage requires a very large site, and the cost of direct long-distance transportation is also very high. If the cost is transported to a nearby factory for granulation, it will double. Therefore, the market circulation cost of biomass raw materials is very high, which seriously limits the industrial development of biomass energy. The biomass raw material molding machine of the present application has a compact structure and can be directly pulled and transported to the raw material growing site. The biomass raw materials can be shredded and molded on site without installation, and packaged into standard biomass briquettes for storage. The biomass raw materials do not need to occupy a large area of ​​land for stacking and storage and continuous turning to prevent high temperature, nor do they need to be transported to a granulation plant for granulation, which reduces transportation costs, thereby solving the problems of difficult collection, high transportation costs, and difficult warehousing of biomass raw materials, greatly saving the costs of collection, storage and transportation, and being conducive to the standardization, commercialization and market circulation of biomass raw materials.

[0024] (2) Through the design of the biomass raw material molding machine of the present application, the shredder and the molding machine are combined through structural optimization to meet different biomass raw material needs and the molding of biomass raw materials with different moisture contents. It is suitable for more work occasions, effectively utilizes the site space, and realizes the standardization of biomass raw materials.

[0025] (3) The design of the biomass raw material forming machine of the present application not only solves the problem of material shredding and briquetting, but also meets the conditions for the next step of transportation and storage of biomass raw materials. At the same time, the increased density also greatly reduces the transportation cost of biomass raw materials, thereby helping to realize the true commercial circulation of biomass raw materials.

[0026] (4) The present application can shred and squeeze the raw materials to form briquettes, which are easy to store by stacking. Ventilation channels are left between the stacks to prevent the problems of heat, mildew and calorific value loss caused by the accumulation of biomass raw materials.

[0027] (5) Biomass briquettes can be directly fed into biomass combustion furnaces for use as fuel. Compared with the high cost of biomass pellet fuel, biomass briquettes can prevent the accumulation of biomass raw materials during storage, which causes heat, mildew and calorific value loss. This greatly reduces the cost of the combustion furnace and is conducive to promoting the market application of biomass resources.

[0028] (6) Biomass briquettes can be directly sent to biomass power plants. After the biomass raw materials are standardized, the original biomass raw material stacking method can be changed, which can better enable long-term storage, reduce the loss of calorific value, and improve the power generation efficiency of biomass raw materials.

[0029] (7) A single motor input double gear transmission is used to drive the shredding equipment, which reduces input equipment and reduces equipment costs.

[0030] (8) The rotation speeds of the first and second spindles are different. During the shredding process, the material is subjected to a fast and a slow shear force, which can greatly improve the shredding efficiency.

[0031] (9) The material passes through the compression zone, molding zone and shape-keeping zone of the molding cylinder in sequence, and the material is compressed by the effect of the gradual shrinkage of the conical compression zone space, and the material is further compressed by the resistance between the material and the side wall in the molding zone. The shape-keeping zone, whose inner diameter is slightly larger than that of the molding zone, can not only keep the molded material slightly expanded within the control range, but also keep it in a complete form of biomass briquette, and enable the compressed material to be easily pushed forward by the molding screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a front view of the biomass raw material forming machine described in an embodiment of the present invention.

[0033] Figure 2 It is a top view of the first main shaft and the second main shaft according to an embodiment of the present invention.

[0034] Figure 3 It is a schematic diagram of the forming tube described in an embodiment of the present invention.

[0035] Figure 4 Schematic diagram of a single motor input dual gear transmission according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0037] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "connection" can be detachably connected or non-detachably connected; it can be directly connected or indirectly connected through an intermediate medium. Among them, "fixed connection" means that the relative position relationship after connection remains unchanged. "Rotational connection" means that the two parts are connected to each other and can rotate relative to each other after connection. The directional terms mentioned in the embodiments of the present application, such as "upper", "lower", "inner", "outer", etc., are only reference directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. Among them, the two components are obtained by an integrated molding process. The integrated structure means that in the process of forming one of the two components, the component is connected to the other component, and there is no need to connect the two components together by reprocessing (such as bonding, welding, snap connection, screw connection).

[0038] The present application provides a biomass raw material forming machine, which is a combination of a shredder and a forming machine through structural optimization, and can shred and form biomass raw materials with different moisture content, is applicable to more work occasions, effectively utilizes site space, and realizes the standardization of biomass raw materials. It is particularly suitable for shredding and forming various agricultural and forestry biomass resources such as straw, cotton stalks, reeds, reeds, bamboo, branches, trunks, roots, etc.

[0039] The biomass raw material molding machine of the present application includes a shredding device 1 and a molding device 2 located below the shredding device, wherein the shredding device is used to shred the biomass raw material and drop it into the molding hopper below. The molding device 2 is used to push the shredded material into the molding cylinder and squeeze it in the direction of the discharge port to perform work. The material entering the molding cylinder generates resistance through friction with the cylinder wall of the molding cylinder, and the loose shredded material is squeezed into a molding material with a higher density. After reaching a certain length, it is cut by a cutter to form a biomass briquette that can be easily transported and stored, and packaged and molded.

[0040] Please refer to Figure 1 , Figure 2 The shredding device 1 includes a first main shaft 100 and a second main shaft 200 which are arranged in parallel and staggered. The first main shaft 100 is connected to a first motor 101. Specifically, the output shaft of the first motor 101 is connected to one end of a first coupling 102, the other end of the first coupling 102 is connected to the input shaft of a first reducer 103, the output shaft of the first reducer 103 is connected to one end of a second coupling 104, and the other end of the second coupling 104 is connected to the first main shaft 100.

[0041] Similarly, the second main shaft 200 is connected to the second motor 201. Specifically, the output shaft of the second motor 201 is connected to one end of the third coupling 202, the other end of the third coupling 202 is connected to the input shaft of the second reducer 203, the output shaft of the second reducer 203 is connected to one end of the fourth coupling 204, and the other end of the fourth coupling 204 is connected to the second main shaft 200.

[0042] The output shafts of the first motor 101 and the second motor 201 are arranged in parallel and staggered. Tools are fixedly installed on the first spindle 100 and the second spindle 200. Specifically, a plurality of first movable knives 105 are arranged axially at intervals on the outer circumference of the first spindle 100, and a cutter head is fixedly installed on the first movable knives 105. The first movable knives 105 can be formed integrally with the cutter head, or can be installed in a separate combination.

[0043] Similarly, a plurality of second movable knives 205 are arranged axially at intervals on the outer circumference of the second main shaft 200, and a cutter head is fixedly mounted on each of the second movable knives. The second movable knives can be formed integrally with the cutter head, or can be installed in a separate assembly.

[0044] The positions of the movable knives on the first spindle 100 and the second spindle 200 are staggered in the axial direction, and the movable knives extend into the interval between the movable knives of the other spindle. Specifically, the first movable knife 105 of the first spindle 100 extends into the interval between the second movable knives 205 on the second spindle 200, and the second movable knife 205 of the second spindle 200 also extends into the interval between the first movable knives 105 on the first spindle 100.

[0045] Moreover, the rotation directions of the first motor 101 and the second motor 201 are opposite and they rotate inward in the opposite direction, thereby driving the first main shaft 100 and the second main shaft 200 to rotate inward in the opposite direction, forming a shredding work, tearing the material through the cutter head, and the mutually offset moving knives drive the two main shafts to shred and shear the torn material.

[0046] In some embodiments, the first motor 101 and the second motor 201 have exactly the same rotational speed and power, but the reduction ratios of the reducer 1 and the reducer 2 are different, so that the rotational speeds of the first spindle 100 and the second spindle 200 are different, for example, a difference of 3-5 revolutions. During the shredding process, the material is subjected to a fast and a slow shear force, which can greatly improve the shredding efficiency.

[0047] In some embodiments, a static knife 206 is further provided in the shredding device. The static knife 206 may be installed on the inner wall of the shredding device, and has a fixed gap with the blades of the first movable blade and the second movable blade. When a large amount of material is stuck on the blades, the static knife can scrape the material off the movable blades. The specific static knife may be, for example, a scraper fixedly connected to the inner wall of the shredding device.

[0048] The first main shaft and the second main shaft are both installed in the box body 10 through bearings. For example, both ends of the second main shaft 200 are installed in the box body through bearings 207 installed on the box body 10. A feed hopper 20 is connected to the upper end of the box body 10, and the feed hopper 20 is used to receive the biomass raw materials to be shredded.

[0049] Please refer to Figure 1 The molding device includes a driving unit and a molding unit. The molding unit is to extrude and mold the shredded material by means of a molding screw 601 installed in the molding cylinder 401 during the spiral rotation process, and to push the material in the direction of the discharge port in a spiral manner. The material entering the molding cylinder generates resistance by friction with the cylinder wall of the molding cylinder, and the loose shredded material is squeezed into a large biomass particle block with a high density that can be easily transported and stored. After reaching a certain length, it is cut by a cutter and packaged. Due to the spiral propulsion, the shape of the molding cylinder is cylindrical.

[0050] The forming screw 601 can be designed to be conical or cylindrical, and can also be set to a multi-start spiral structure to increase the spiral advancement speed.

[0051] The driving unit is composed of a motor and a reducer, including a fourth motor 701 and a fourth reducer 702. The output shaft of the third reducer 702 is connected to the forming screw 601. Specifically, the two can be connected by a spline sleeve coupling.

[0052] In some embodiments, a material guide bracket is designed and installed in the forming cylinder, one end of the forming screw is connected to the output end of the driving unit, and the other end is connected to the material guide bracket. A plurality of support rods are fixedly connected radially to one end of the forming screw facing the discharge port.

[0053] Exemplarily, the main shaft diameter of the molding screw 601 is smaller than the diameter of the molding screw, and the part of the main shaft axially exceeds the spiral blade. The material guide bracket includes a support ring 602 and a support rod 603. A plurality of support rods 603 are fixedly connected radially to the part of the main shaft exceeding the spiral blade, and the radial outer ends of the support rods 603 are fixedly connected to the support ring 602. The outer diameter of the support ring 602 is equivalent to the inner diameter of the molding barrel, so as to achieve the stability of the main shaft of the screw.

[0054] Please refer to Figure 3The forming cylinder 401 includes a compression zone 4011, a forming zone 4012 and a shape-keeping zone 4013 which are connected in sequence. The compression zone 4011 is a tapered shape which gradually decreases along the pushing direction. The inner diameter of the forming zone is the same as the tapered small diameter end of the compression zone, and the shape-keeping zone is larger than the inner diameter of the forming zone.

[0055] The forming screw pushes the shredded material to pass through the compression zone 4011 first, and the shredded material is pushed to move toward the small diameter end. As the space gradually shrinks, the shredded material is initially compressed. Then the forming screw pushes the material into the forming zone, and the material is further compressed into a formed material under the resistance of the forming zone and the side wall. The formed material enters the shape-keeping zone 4013, and after the formed material is slightly expanded within the control range, it is still a complete biomass briquette.

[0056] Further, the molding device 2 also includes a cutting knife 403, which is arranged at a certain distance from the other end of the molding cylinder. When the molding screw pushes the molding material out of the molding cylinder to reach a set length, the cutting knife 403 cuts the molding material into standard biomass briquettes 30 and falls on the conveyor 40. In the past, the moisture content of biomass raw materials was high when they were collected. When a large amount of biomass raw materials were piled together in the traditional mode, anaerobic fermentation began when air could not circulate. At the same time, the internal temperature continued to rise, and continuous turning of the pile was required. In such an environment, the internal mold of the biomass raw materials was serious, resulting in a significant reduction in the calorific value of the biomass raw materials during storage. After long-term stacking, the calorific value is even less than half of the original. The biomass briquettes obtained in this application can be stacked and stacked, and ventilation lanes are left between the stacks to prevent the problems of heating, mildew and calorific value loss caused by the accumulation of biomass raw materials.

[0057] The particle size of biomass briquette is different from that of pelletizer by an order of magnitude. The particle diameter of biomass pellet forming machine is 5-30mm and the length is about 10-50mm; while biomass briquette can be 1 meter square or 2 cubic meters in volume. Biomass briquette can be directly fed into biomass briquette combustion furnace for use as fuel. Compared with biomass pellet fuel, the cost of biomass briquette is greatly reduced, which is conducive to promoting the market application of biomass resources.

[0058] Biomass briquettes can be directly sent to biomass power plants. After standardizing the biomass raw materials, the original stacking method of biomass raw materials can be changed, which can better enable long-term storage, reduce the loss of calorific value, and improve the power generation efficiency of biomass raw materials. At the same time, the increased density also greatly reduces the transportation cost of biomass raw materials.

[0059] In some embodiments, when the shredded material falls to the inlet 404 at the upper part of the forming cylinder (that is, the lower end of the shredder discharge hopper), part of it may be above the inlet and part of it may enter the forming cylinder. In this way, when the forming screw pushes the material to move, the material will be clamped at the inlet, which may make it impossible to spirally push the material. A shearing tool can be set inside the inlet 404 to solve the problem of material clamping when the material enters the forming cylinder and ensure that the material enters the forming cylinder smoothly. The shearing tool can be, for example, a horizontally rotating cutter driven by a motor, and the specific structure is not described in detail here.

[0060] In some embodiments, a mesh bag device is designed at the discharge port of the forming cylinder to realize the automatic bagging function. The mesh bag device can be a mesh bag with a bag opening mechanically opened at the discharge port. The formed biomass briquette is pushed out and enters the mesh bag and drives the mesh bag forward to fall into the conveyor belt. After reaching the set length, the mesh bag and the biomass briquette are cut by a cutting knife, and a standard biomass briquette wrapped in a mesh bag can be obtained. The specific structure of the mechanical bag opening can be a conventional design and is not described here.

[0061] In some embodiments, a single motor input dual gear transmission method can be used to drive the first spindle 100 and the second spindle 200. Figure 4 , the first gear 503 and the second gear 504 are fixedly connected at both ends of the second main shaft 200, and the third gear 505 and the fourth gear 506 are fixedly connected at both ends of the first main shaft 100. The output shaft of the third motor 501 is connected to the third reducer 502, and the output shaft of the third reducer 502 is connected to the fifth coupling 507. The output end of the fifth coupling is connected to the first gear 503. Since the first gear 503 is fixedly connected to the second main shaft 200, the second main shaft 200 can be driven to rotate. The first gear 503 is meshed with the third gear 505, and the second gear 503 is meshed with the fourth gear 506, so that the third gear and the fourth gear follow the rotation, thereby driving the first main shaft 100 to rotate. And the first main shaft 100 and the second main shaft 200 rotate inward in opposite directions to form a tearing work, and the material is bitten by the cutter head, and the mutually displaced moving knives are driven by the two main shafts to tear and shear the bitten material.

[0062] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and deformations according to the present invention, but these corresponding changes and deformations shall fall within the protection scope of the claims of the present invention.

Claims

1. A biomass raw material molding machine, characterized in that: The invention comprises a shredding device and a molding device located below the shredding device, wherein the shredding device is used to shred biomass raw materials and feed the shredded raw materials into the molding device from a discharge hopper, and the molding device comprises: The molding unit comprises a molding barrel and a molding screw, wherein the molding screw is installed in the molding barrel and extrude the shredded material into molding material during the spiral rotation of the molding screw; The cutting knife is arranged at a set distance outside the discharge port of the forming cylinder, and is used to cut the forming material into biomass briquettes of set length after the forming screw pushes the forming material out of the forming cylinder.

2. The biomass raw material molding machine according to claim 1, characterized in that: The forming cylinder includes a compression zone, a forming zone and a shape-keeping zone connected in sequence. The compression zone is a tapered shape that gradually decreases along the pushing direction. The inner diameter of the forming zone is the same as the tapered small diameter end of the compression zone. The shape-keeping zone is 2-20 mm larger than the inner diameter of the forming zone.

3. The biomass raw material molding machine according to claim 1, characterized in that: The molding screw is conical or cylindrical, and the molding screw is a multi-start screw.

4. The biomass raw material forming machine according to claim 1, characterized in that: A material guide bracket is installed in the forming cylinder, and the material guide bracket includes a support ring and a support rod. A plurality of support rods are radially fixedly connected to one end of the forming screw facing the discharge port, and the radial outer end of the support rod is fixedly connected to the support ring, and the outer diameter of the support ring is the same as the inner diameter of the forming cylinder.

5. The biomass raw material molding machine according to claim 1, characterized in that: The shredding equipment includes a first main shaft and a second main shaft arranged in parallel and staggered, a plurality of first movable knives are arranged at intervals along the axial direction on the outer circumference of the first main shaft, and a plurality of second movable knives are arranged at intervals along the axial direction on the outer circumference of the second main shaft, the positions of the movable knives on the first main shaft and the second main shaft are staggered in the axial direction, and the movable knives extend into the interval space between the movable knives of the other main shaft, the first main shaft and the second main shaft rotate inwardly in opposite directions to shred and shear the material, and the rotation speeds of the first main shaft and the second main shaft are different.

6. The biomass raw material forming machine according to claim 5, characterized in that: A stationary knife is also provided in the shredding device. The stationary knife is installed on the inner wall of the shredding device and has a fixed gap with the first moving knife and the second moving knife. The material on the moving knife is scraped off by the stationary knife.

7. The biomass raw material molding machine according to claim 1, characterized in that: The cross section of the forming cylinder is a circular cross section.

8. The biomass raw material forming machine according to claim 1, characterized in that: A shearing tool is arranged inside the lower end of the discharge hopper of the shredding device.

9. The biomass raw material forming machine according to claim 5, characterized in that: A first gear and a second gear are fixedly connected at both ends of the second main shaft, a third gear and a fourth gear are fixedly connected at both ends of the first main shaft, an output shaft of the third motor is connected to the third reducer, an output shaft of the third reducer is connected to the first gear, the first gear is meshed with the third gear, and the second gear is meshed with the fourth gear.

10. The biomass raw material forming machine according to claim 5, characterized in that: The shredding device comprises a first motor and a second motor, the output shaft of the first motor is connected to one end of the first coupling, the other end of the first coupling is connected to the input shaft of the first reducer, the output shaft of the first reducer is connected to one end of the second coupling, and the other end of the second coupling is connected to the first main shaft; The output shaft of the second motor is connected to one end of the third coupling, the other end of the third coupling is connected to the input shaft of the second reducer, the output shaft of the second reducer is connected to one end of the fourth coupling, and the other end of the fourth coupling is connected to the second main shaft.

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