Feed packaging assist device

Abstract

The utility model discloses a feed packaging assist device, and relates to the technical field of feed production equipment. According to the technical key points, the device comprises a device rack, a horizontal feed conveying tank is installed at the top of the device rack, a spiral conveyor is installed in the horizontal feed conveying tank, and a driving device is installed on one side of the device rack; a feeding hopper is arranged on the upper side of one end of the horizontal feed conveying tank, and a plurality of discharging holes are evenly formed in an end plate at the other end of the horizontal feed conveying tank. A discharging groove is formed in the lower side of the end, provided with the multiple discharging holes, of the horizontal feed conveying tank, and an alternate receiving mechanism is arranged below the lower end of the discharging groove and can quickly complete replacement operation of packaging bags below the lower end of the discharging groove. Feed to be bagged can be scattered through the spiral conveyor mounted in the horizontal feed conveying tank, so that the bagging uniformity is improved, and the bagging and packaging efficiency of the feed can be remarkably improved through the alternate receiving mechanism arranged below the discharging groove.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of feed production equipment, in particular to a feed packaging auxiliary device. BACKGROUND

[0002] When raising livestock, feed is a necessary material for the growth of livestock. Compared with traditional forage, feed can provide balanced basic nutrition for livestock through scientific proportioning, strengthen the immune system of livestock, and improve the growth rate of livestock. The production process of feed includes the pretreatment of raw materials in the early stage, the core processing procedure after pretreatment (raw material crushing, batching, mixing, and pressing into ideal particles), and finally drying, quality inspection, packaging, storage, or selling.

[0003] In order to facilitate packaging operation, production units usually provide workers with special packaging auxiliary equipment, which can improve growth efficiency and reduce the labor burden of workers. However, the existing packaging auxiliary equipment usually has only one packaging bag placement position below the feeding pipe. After filling one empty packaging bag, the worker needs to move the filled packaging bag to place a new packaging bag for continuous filling and packaging. The common feed packaging bag weighs more than 20 kg after being filled with feed, and it takes a certain amount of time for the worker to replace it, which obviously affects the efficiency of large packaging of feed. In addition, after mixing and drying, feed often forms some clumps. The existing packaging auxiliary equipment lacks the function of stirring and dispersing the clumped feed when filling the empty packaging bag, which not only affects the uniformity of the feed filling in the packaging bag, but also requires the breeder to perform the operation of dispersing the clumps during subsequent use. CONTENT OF THE INVENTION

[0004] The present application provides a feed packaging auxiliary device that can not only improve the packaging efficiency of feed, but also stir and disperse the clumped feed during the feeding process.

[0005] The above-mentioned object of the present application is achieved by the following technical solution:

[0006] A feed packaging auxiliary device, comprising a device rack, a horizontal feed conveying tank is installed on the top of the device rack, a screw conveyor is installed in the horizontal feed conveying tank, a driving device is installed on one side of the device rack, and the driving device is used to drive the screw conveyor to rotate in the horizontal feed conveying tank.

[0007] The upper side of one end of the horizontal feed conveying tank is provided with a feeding hopper, the internal space of the feeding hopper is communicated with the internal space of the horizontal feed conveying tank, and the end plate at the other end of the horizontal feed conveying tank is uniformly provided with a plurality of discharge holes, and the hole diameter of the discharge hole is not less than the particle size of the feed particles.

[0008] The lower side of one end of the horizontal feed conveying tank provided with a plurality of discharge holes is provided with an inclined discharge chute, and the upper end of the discharge chute is fixedly installed on the equipment rack.

[0009] The lower end of the discharge chute is provided with a rotating receiving mechanism, and the rotating receiving mechanism can quickly complete the replacement operation of the packaging bag under the lower end of the discharge chute.

[0010] Further, the rotating receiving mechanism comprises a bottom support seat, the bottom support seat is fixedly installed on the supporting leg below the equipment rack, the upper side of the bottom support seat is provided with a bagging platform, and the bagging platform can freely rotate on the bottom support seat around the axis of the bottom support seat.

[0011] The upper side of the bagging platform is uniformly provided with a plurality of support frames for supporting the packaging bag along the circumference.

[0012] Further, the support frame is composed of two inverted U-shaped support rods with a spacing between each other, and the open ends of the two inverted U-shaped support rods are fixedly installed on the bagging platform.

[0013] Further, the number of support frames on the bagging platform is four.

[0014] Further, a gap is provided below the front side of the equipment rack, and part of the rotating receiving mechanism is located in the gap of the front side of the equipment rack.

[0015] Further, the upper side of the bottom support seat is provided with an annular groove along the circumference, the lower side of the bagging platform is uniformly provided with a plurality of moving wheels along the circumference, the distance from the moving wheels to the center of the bagging platform is the same as the radius of the annular groove, and the width of the annular groove matches the wheel width of the moving wheels.

[0016] Further, the driving device comprises a power motor fixedly installed on the equipment rack, the input end of the power motor is fixedly connected with a driving pulley away from the rotating receiving mechanism, the same side of the horizontal feed conveying tank is provided with a first driven pulley, the center of the first driven pulley is fixedly connected with the corresponding end of the screw conveyor shaft, and the first driven pulley and the driving pulley are connected through a transmission belt.

[0017] Further, a transmission shaft is additionally arranged between the driving pulley and the first driven pulley, one end of the transmission shaft is rotatably connected with a bearing seat fixedly installed on the equipment rack, a second driven pulley and a third driven pulley are sequentially fixedly installed on the transmission shaft along the axial direction of the transmission shaft, and the second driven pulley and the driving pulley and the third driven pulley and the first driven pulley are connected through a transmission belt respectively.

[0018] To sum up, the present application includes at least one of the following beneficial technical effects:

[0019] The horizontal feed conveying tank installed on the equipment rack is provided with a spiral conveyor, and the feed to be packed will be repeatedly stirred by the spiral conveyor in the horizontal feed conveying tank before entering the packaging bag, so as to break the caked feed, so as to ensure that the feed in the packaging bag is in a uniform granular state, so that the uniformity of the feed filling in the packaging bag is improved, and the breeder can avoid the trouble of breaking the caked feed when using the feed subsequently. In addition, the present application is provided with a rotating material receiving mechanism below the discharge chute, which can quickly switch to other newly opened packaging bags after one packaging bag is filled, so as to effectively shorten the time of workers changing the packaging bags below the discharge chute, thereby effectively improving the efficiency of feed packaging. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

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

[0022] Figure 2 is a schematic diagram of the structure of the horizontal feed conveying tank of the present application after being partially cut open;

[0023] Figure 3 is a schematic diagram of the structure of the bagging platform of the present application after being detached from the bottom support;

[0024] Figure 4 is a schematic diagram of the structure of the present application Figure 3 from the oblique lower side of the equipment rack;

[0025] Figure 5 is a schematic diagram of the state of the packaging bag when loading under the discharge chute of the present application.

[0026] The drawing mark: 1, equipment rack; 2, horizontal feed conveying tank; 3, screw conveyor; 4, driving equipment; 41, power motor; 42, driving pulley; 43, first driven pulley; 5, feeding hopper; 6, discharge hole; 7, discharge chute; 8, alternate receiving mechanism; 81, bottom support seat; 82, bagging platform; 83, support frame; 831, inverted U-shaped support rod; 9, annular groove; 10, moving wheel; 11, transmission shaft; 12, second driven pulley; 13, third driven pulley; 14, packaging bag. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor also belong to the scope of protection of the present application.

[0028] As shown in Figure 1 and Figure 2 , a feed packing auxiliary disclosed by the present application comprises an equipment rack 1, a horizontal feed conveying tank 2 is installed on the top of the equipment rack 1, a screw conveyor 3 is installed in the horizontal feed conveying tank 2, a driving equipment 4 is installed on one side of the equipment rack 1, and the driving equipment 4 is used to drive the screw conveyor 3 to rotate in the horizontal feed conveying tank 2.

[0029] An end of the horizontal feed conveying tank 2 is provided with an inclined discharge chute 7 on the lower side, and the upper end of the discharge chute 7 is fixedly installed on the equipment rack 1.

[0030] A feeding hopper 5 is arranged on the upper side of the end of the horizontal feed conveying tank 2, and the internal space of the feeding hopper 5 is connected with the internal space of the horizontal feed conveying tank 2.

[0031] A plurality of discharge holes 6 are uniformly arranged on the end head plate of the other end of the horizontal feed conveying tank 2, and the hole diameter of the discharge holes 6 is not less than the particle size of the feed particles.

[0032] In the above embodiment, the upper side of one end of the horizontal feed conveying tank 2 at the top of the device rack 1 is provided with a feeding hopper 5, and the feed to be packed can be smoothly poured into the horizontal feed conveying tank 2 from the feeding hopper 5. The horizontal feed conveying tank 2 is arranged horizontally at the top of the device rack 1, and a spiral conveyor 3 is coaxially arranged inside the horizontal feed conveying tank 2. The spiral conveyor 3 of the present application is a shaft spiral conveyor 3, the two ends of the rotating shaft of which are respectively rotatably connected to the two end head plates of the horizontal feed conveying tank 2. One end of the spiral conveyor 3 is connected to the driving device 4 installed on the device rack 1. After the driving device 4 operates, the spiral conveyor 3 can rotate in the horizontal feed conveying tank 2. With the rotation of the spiral conveyor 3, the feed added from the feeding hopper 5 will be stirred by the spiral conveyor 3 while moving towards the end of the horizontal feed conveying tank 2 provided with a discharge hole 6. The lumps that may exist in the feed will be broken up by the spiral conveyor 3 during this process. The end head plate near the discharge chute 7 of the horizontal feed conveying tank 2 is provided with a plurality of discharge holes 6 with a hole diameter not less than the particle size of normal feed. Under the action of the extrusion force of the spiral conveyor 3, the feed that may be lumpy can be dispersed again by the discharge hole 6. Feed particles with appropriate particle size will smoothly emerge from the discharge hole 6 and then flow along the discharge chute 7 to the prepared packaging bag 14 below. In actual production, the hole diameter of the discharge hole 6 can be set to 5-10 times the particle size of the feed particles. Compared with the discharge hole 6 with too small a hole diameter, the discharge efficiency of the feed particles can be ensured not to be too low, and the risk of the feed not being crushed in time can be reduced. After the feed is discharged from the discharge hole 6 of the horizontal feed conveying tank 2, it will flow along the discharge chute 7 to the packaging bag 14 placed in advance on the rotating material receiving mechanism 8. After the packaging bag 14 is filled, the worker can quickly remove the filled packaging bag 14 through the rotating material receiving mechanism 8 and move the new packaging bag 14 to the discharge chute 7 below. Compared with the prior art, the time required for the worker to replace the packaging bag 14 under the discharge chute 7 can be effectively saved, thereby effectively improving the efficiency of feed bagging and packing.

[0033] Further, as shown in Figure 3 and Figure 4 , the rotating material receiving mechanism 8 includes a bottom support seat 81 fixedly installed on the supporting leg below the device rack 1. An upper side of the bottom support seat 81 is provided with a bagging platform 82 which can freely rotate around the axis of the bottom support seat 81.

[0034] The upper side of the bagging platform 82 is uniformly provided with a plurality of support frames 83 for supporting the packaging bag 14.

[0035] In the above embodiment, the bottom support base 81 of the present application can provide support force for the bagging platform 82 through the legs at the bottom of the equipment rack 1, and the bagging platform 82 is movably installed on the bottom support base 81, so that workers can quickly move the packaging bag 14 placed on the support frame 83 at different positions on the bagging platform 82 to the position below the discharge chute 7 as needed.

[0036] Further, as shown in Figures 3-5 , the support frame 83 is composed of two inverted U-shaped support rods 831 with a spacing between each other, and the open ends of the two inverted U-shaped support rods 831 are fixedly installed on the bagging platform 82.

[0037] In the above embodiment, the closed ends of the two inverted U-shaped support rods 831 are upward, and after the workers turn the bag opening of the packaging bag 14 outward, the packaging bag 14 can be sleeved on the closed ends of the two inverted U-shaped support rods 831, so that the bag opening of the packaging bag 14 can be kept in an open state during feeding, so that the feed discharged from the discharge chute 7 can smoothly enter the packaging bag 14. The two inverted U-shaped support rods 831 have sufficient spacing, which can ensure that the bag opening of the packaging bag 14 can be fully opened, and on the other hand, after the subsequent feeding is completed, it is convenient for workers to take the packaging bag 14 from between the two inverted U-shaped support rods 831.

[0038] Further, as shown in Figure 2 and Figure 3 , the number of support frames 83 on the bagging platform 82 is four.

[0039] In the above embodiment, four support frames 83 are uniformly arranged on the bagging platform 82 of the present application along the circumference thereof, and the included angle between adjacent two support frames 83 is 90°. When one of the support frames 83 on which the packaging bag 14 is placed is located below the discharge chute 7, the two support frames 83 adjacent to it are located on the opposite side of the equipment rack 1 in the width direction, and there is sufficient space on the outer side of the two support frames 83 for a worker to stand, one worker is responsible for sleeving the packaging bag 14 on the adjacent support frame 83 and rotating the bagging platform 82, and the other worker is responsible for moving the filled packaging bag 14 away from the bagging platform 82, so that the efficiency of feed bagging and packaging can be effectively improved.

[0040] Further, as shown in Figure 1 , Figure 2 and Figure 5 , a gap is provided below the front side of the equipment rack 1, and part of the alternating material receiving mechanism 8 is located in the gap on the front side of the equipment rack 1.

[0041] In the above embodiment, the equipment rack 1 is arranged in the above manner, and the space in the gap on the front side thereof can be effectively utilized to place part of the alternating material receiving mechanism 8, so that the requirement for space during installation of the entire equipment can be effectively reduced.

[0042] Further, as Figure 3 and Figure 4 shown, the upper side of the bottom support base 81 is provided with an annular groove 9 along its circumference, and the lower side of the bagging platform 82 is uniformly provided with a plurality of moving wheels 10 along its circumference. The distance from the moving wheels 10 to the center of the bagging platform 82 is the same as the radius of the annular groove 9, and the width of the annular groove 9 matches the wheel width of the moving wheels 10.

[0043] In the above embodiment, the part of the plurality of moving wheels 10 provided circumferentially below the bagging platform 82 is embedded in the annular groove 9 on the bottom support base 81. When the worker needs to adjust the position of the packaging bag 14, the bagging platform 82 can be driven to rotate on the bottom support base 81 by the support frame 83. In this process, the bagging platform 82 moves relatively on the bottom support base 81 by the moving wheels 10. Compared with directly placing the bagging platform 82 on the bottom support base 81, the resistance to adjusting the position of the bagging platform 82 by the moving wheels 10 is smaller, and the worker can adjust it more conveniently and labor-saving.

[0044] Further, as Figures 1-3 shown, the driving device 4 includes a power motor 41 fixedly installed on the equipment rack 1. The input end of the power motor 41 is fixedly connected with a driving pulley 42 away from the wheel-changing material receiving mechanism 8. The same side of the horizontal feed conveying tank 2 is provided with a first driven pulley 43. The center of the first driven pulley 43 is fixedly connected with the corresponding end of the rotating shaft of the screw conveyor 3. The first driven pulley 43 and the driving pulley 42 are connected by a transmission belt.

[0045] In the above embodiment, the power motor 41 can drive the driving pulley 42 connected thereto to rotate through its output end. The driving pulley 42 and the first driven pulley 43 are connected by a transmission belt. Therefore, when the driving pulley 42 rotates, the screw conveyor 3 connected with the first driven pulley 43 can be driven to rotate by the transmission of power through the transmission belt, thereby achieving the effect of stirring and conveying the feed in the horizontal feed conveying tank 2.

[0046] Further, as Figures 1-3 shown, a transmission shaft 11 is additionally provided between the driving pulley 42 and the first driven pulley 43. One end of the transmission shaft 11 is rotatably connected with a bearing seat fixedly installed on the equipment rack 1. A second driven pulley 12 and a third driven pulley 13 are fixedly installed on the transmission shaft 11 along its axis direction in sequence. The second driven pulley 12 and the driving pulley 42, and the third driven pulley 13 and the first driven pulley 43 are respectively connected by a transmission belt.

[0047] In the above embodiment, the wing plate of the power motor 41 is installed at the lower end of the equipment rack 1 for stability and subsequent maintenance. The horizontal feed conveying tank 2 is connected to the feeding hopper 5, which is usually set at a higher position for convenient feeding. Therefore, there is a long distance between the power motor 41 and the horizontal feed conveying tank 2. In order to use the driving pulley 42 driven by the power motor 41 to rotate the first driven pulley 43 on the rotating shaft of the screw conveyor 3 in the horizontal feed conveying tank 2, the transmission belt between the driving pulley 42 and the first driven pulley 43 needs to be set relatively long. The excessively long transmission belt often has the following problems in actual use: slipping due to insufficient tension, and aggravated lateral shaking of the transmission belt. To solve these problems, the application adds a transmission shaft 11 between the first driven pulley 43 and the driving pulley 42. One end of the transmission shaft 11 is rotatably connected to the equipment rack 1 through a bearing seat. The transmission shaft 11 is sequentially provided with a second driven pulley 12 and a third driven pulley 13 along the axial direction thereof. In order to facilitate power transmission, the driving pulley 42 and the first driven pulley 43 are arranged in a staggered manner. The second driven pulley 12 is directly opposite to the driving pulley 42 and connected to the driving pulley 42 through a transmission belt. The third driven pulley 13 is directly opposite to the first driven pulley 43 and connected to the first driven pulley 43 through a transmission belt. In this way, when the power motor 41 operates, it will first transmit power to the transmission shaft 11 through the transmission belt, and then use another transmission belt to rotate the screw conveyor 3 through the transmission shaft 11. Through the arrangement of the application, the length of a single transmission belt can be effectively shortened, ensuring smooth power transmission and effectively avoiding problems caused by excessively long transmission belts.

[0048] The implementation principle of the embodiment is that when the feed needs to be bagged and packaged, the worker can first place an empty packaging bag 14 on one of the support frames 83 on the bagging platform 82, the bag opening of the placed packaging bag 14 is sleeved on the closed ends of the two inverted U-shaped support rods 831, then the worker rotates the bagging platform 82 to move the packaging bag 14 to below the discharge chute 7, then the worker can re-place a new packaging bag 14 on the other support frame 83 in front, and at the same time, the driving motor 41 is started, the feed is added to the horizontal feed conveying tank 2 through the feeding hopper 5, the feed in the horizontal feed conveying tank 2 is stirred and scattered with the rotation of the screw conveyor 3, and then flows out from the discharge hole 6 at one end of the horizontal feed conveying tank 2 and continuously falls into the first prepared packaging bag 14 along the discharge chute 7, after the first prepared packaging bag 14 is filled, the worker standing beside the second prepared packaging bag 14 can rotate the bagging platform 82 to move the second prepared packaging bag 14 to below the discharge chute 7, and the first packaging bag 14 filled with feed reaches the opposite side of the worker responsible for preparing the packaging bag 14, at this time, since the equipment is charging the second packaging bag 14, the worker has enough time to move the first packaging bag 14 filled with feed away, or an additional worker is added opposite the worker responsible for preparing the packaging bag 14 to be responsible for moving the packaging bag 14 filled with feed away, which can effectively improve the packaging efficiency and reduce the fatigue of individual workers. When charging the second packaging bag 14, the worker responsible for preparing the packaging bag 14 can continue to place a third packaging bag 14 on the support frame 83 in front of him, after the second packaging bag 14 is filled, the worker can rotate the third packaging bag 14 to below the discharge chute 7, which can effectively shorten the time for replacing the packaging bag 14 below the discharge chute 7 during the feed charging process, thereby effectively improving the charging and packaging efficiency. The application has a very short interval during the replacement process of the packaging bag 14, so there is not much feed spilled on the bagging platform 82 during the replacement gap, and the worker can clean the bagging platform 82 regularly, if in order to reduce the subsequent trouble of cleaning the bagging platform 82, a special shovel can be prepared in advance, and the worker can temporarily collect the feed flowing out of the discharge chute 7 by holding the shovel during the rotation of the bagging platform 82, the specific coping method can be adaptively adjusted according to the actual situation on site, which will not be described here.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions described in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A feed packing aid comprising a device frame (1), characterised in that: The top of the equipment rack (1) is provided with a horizontal feed conveying tank (2), the inside of the horizontal feed conveying tank (2) is provided with a screw conveyor (3), one side of the equipment rack (1) is provided with a driving device (4), the driving device (4) is used for driving the screw conveyor (3) to rotate in the horizontal feed conveying tank (2); One end of the horizontal feed conveying tank (2) is provided with a feeding hopper (5), the inside space of the feeding hopper (5) is communicated with the inside space of the horizontal feed conveying tank (2), a plurality of discharge holes (6) are uniformly arranged on the end plate of the other end of the horizontal feed conveying tank (2), and the hole diameter of the discharge hole (6) is not less than the particle size of the feed particles; The end of the horizontal feed conveying tank (2) provided with a plurality of discharge holes (6) is provided with an inclined discharge chute (7) on the lower side, and the upper end of the discharge chute (7) is fixedly installed on the equipment rack (1); The lower end of the discharge chute (7) is provided with a wheel changing receiving mechanism (8), and the wheel changing receiving mechanism (8) can quickly complete the replacement operation of the packaging bag (14) under the lower end of the discharge chute (7).

2. The feed packing aid of claim 1, wherein: The wheel changing receiving mechanism (8) comprises a bottom support seat (81), the bottom support seat (81) is fixedly installed on the supporting leg below the equipment rack (1), the upper side of the bottom support seat (81) is provided with a bagging platform (82), and the bagging platform (82) can freely rotate around the axis of the bottom support seat (81) on the bottom support seat (81). The upper side of the bagging platform (82) is uniformly provided with a plurality of support frames (83) for supporting the packaging bag (14) along the circumference.

3. A feed packing aid according to claim 2, characterised in that: The support frame (83) is composed of two inverted U-shaped support rods (831) with spacing between each other, and the opening ends of the two inverted U-shaped support rods (831) are fixedly installed on the bagging platform (82).

4. The feed packing aid of claim 2, wherein: The number of the support frames (83) on the bagging platform (82) is four.

5. The feed packing aid of claim 4, wherein: The front side of the equipment rack (1) is provided with a gap, and part of the wheel changing receiving mechanism (8) is located in the gap of the front side of the equipment rack (1).

6. A feed packing aid according to any one of claims 2 to 5, characterised in that: The upper side of the bottom support seat (81) is provided with an annular groove (9) along the circumference, the lower side of the bagging platform (82) is uniformly provided with a plurality of moving wheels (10) along the circumference, the distance from the moving wheel (10) to the center of the bagging platform (82) is the same as the radius of the annular groove (9), and the width of the annular groove (9) matches the wheel width of the moving wheel (10).

7. A feed packing aid according to any one of claims 1 to 5, characterised in that: The driving device (4) comprises a power motor (41) fixedly installed on the equipment rack (1), an input end of the power motor (41) is away from the wheel change material receiving mechanism (8) side and is fixedly connected with a driving pulley (42), the same side of the horizontal feed conveying tank (2) is provided with a first driven pulley (43), a center of the first driven pulley (43) is fixedly connected with a corresponding end of a rotating shaft of the screw conveyor (3), and the first driven pulley (43) and the driving pulley (42) are connected through a transmission belt.

8. The feed packing aid of claim 7, wherein: A transmission shaft (11) is additionally arranged between the driving pulley (42) and the first driven pulley (43), one end of the transmission shaft (11) is rotatably connected with a bearing seat fixedly installed on the equipment rack (1), the transmission shaft (11) is sequentially fixedly installed with a second driven pulley (12) and a third driven pulley (13) along an axial direction of the transmission shaft (11), the second driven pulley (12) and the driving pulley (42) are connected through a transmission belt, and the third driven pulley (13) and the first driven pulley (43) are connected through a transmission belt.

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