Double-air-chamber and double-disc rice seed-metering device with adjustable seeding rate

Abstract

The invention relates to the technical field of seed-metering devices, and discloses a seeding-rate-adjustable double-air-chamber double-disc rice seed-metering device which comprises a shell, two seed suction discs are rotationally arranged in the shell, and a plurality of adsorption holes distributed at equal intervals are formed in the side wall of each seed suction disc; the door-shaped plate is fixed to the inner wall of the shell, and the two ends of the door-shaped plate abut against the two seed suction discs respectively; and the multiple gas conveying assemblies are all arranged on the inner wall of the shell, and the gas conveying assemblies are used for conveying gas into the door-shaped plate. According to the seed-metering device, the rotation speed of the transmission disc and the rotation speed of the seed suction discs are synchronous, so that when the rotation speed of the seed suction discs is increased, the rotation speed of the transmission disc is synchronously increased, the air pressure of a low-pressure area between the two seed suction discs is lower, and the air pressure of a high-pressure area between the two seed suction discs is higher, so that the adsorption strength of seeds and the success rate of releasing the seeds are ensured; the technical effect that the seed discharging effect is not worse due to increase of the rotating speed of the seed suction disc is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of seed-metering devices, in particular to a double-air-chamber double-disc rice seed-metering device with adjustable sowing amount. Background Art

[0002] As an important tool in modern agricultural mechanized production, the design and application of the seeder has greatly improved the efficiency and precision of crop planting. This type of machinery directly operates crop seeds and achieves high-yield, high-quality and efficient crop planting by accurately controlling the amount, spacing and depth of seeds. As the core component of the seeder, the performance of the seed meter directly determines the quality and effect of sowing, and is the key to modern agricultural mechanized sowing technology.

[0003] In the existing mechanized rice sowing technology, the sowing density is increased to optimize the crop layout and yield. The traditional method is often achieved by accelerating the rotation of the seed suction disc, but this approach is accompanied by significant disadvantages: as the rotation speed increases, the centrifugal effect is sharply enhanced, making it difficult to stably maintain the seeds adsorbed on the seed suction disc, and it is very easy to be thrown out during high-speed rotation, which directly leads to an increase in the hole rate during the sowing process, affecting the uniformity and efficiency of sowing. Another solution is to increase the number of hole grains. Although this can increase the total amount of seeds per unit area to a certain extent, it is quite complicated to implement. Not only does it require precise control of the suction force of each seed suction unit to ensure the stable adsorption of multiple seeds, but it also requires consideration of the synchronous coordination of the seed suction and seed discharge process to avoid blockage or missed sowing under high-speed operation. There are certain disadvantages, so a double-chamber double-disc rice seed discharger with adjustable sowing amount is proposed to solve the above-mentioned problems. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the seeding effect becomes worse due to the increase in the rotation speed of the seed suction disc, and to propose a double-air-chamber double-disc rice seeding device with adjustable seeding amount.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A rice seed metering device with double air chambers and double discs and adjustable seeding amount, comprising:

[0007] A shell, wherein two seed suction discs are rotatably arranged in the shell, and a plurality of adsorption holes distributed at equal distances are opened on the side wall of each seed suction disc;

[0008] A door plate, wherein the door plate is fixed on the inner wall of the shell, and two ends of the door plate are respectively in contact with the two seed suction discs;

[0009] A plurality of gas delivery assemblies, each of which is arranged on the inner wall of the shell, and is used to deliver gas into the door panel;

[0010] Two cleaning components, both of which are arranged on the inner wall of the shell, and are used to clean the excess seeds on the two seed suction trays respectively;

[0011] Two transmission assemblies, the two transmission assemblies are respectively connected to the two cleaning assemblies, and the two transmission assemblies are respectively matched with the two seed suction discs to form a transmission;

[0012] A power assembly is arranged on the side wall of the shell, and is used to drive the two cleaning assemblies to work.

[0013] Based on the above technical solution, the present invention can also be improved as follows.

[0014] Furthermore, feed pipes are provided through the two side walls of the shell, sealing covers are hinged on the top ends of the two feed pipes, and two discharge pipes are provided through the bottom of the shell.

[0015] Furthermore, the gas delivery assembly comprises:

[0016] A sleeve, wherein the sleeve is fixed on the inner wall of the housing, and a piston is slidably arranged in the sleeve;

[0017] A first one-way valve, the first one-way valve is disposed through the side wall of the sleeve;

[0018] a second one-way valve, the second one-way valve being disposed through the side wall of the sleeve;

[0019] The second connecting block is fixed on the piston, a connecting rod is rotatably arranged on the second connecting block, and the first connecting block is rotatably arranged on the end of the connecting rod.

[0020] Furthermore, the gas delivery assembly also includes:

[0021] Two transmission discs, the two transmission discs are respectively fixed to the two seed suction discs;

[0022] A connecting shaft, wherein the connecting shaft is fixed to the two transmission discs and is arranged at an eccentric position of the transmission discs;

[0023] A plurality of ear plates, wherein the plurality of ear plates are fixed on the side wall of the connecting shaft at equal distances, and the plurality of ear plates are rotationally connected to the plurality of first connecting blocks in a one-to-one manner;

[0024] A connecting pipe is connected to the plurality of second one-way valves, and two ends of the connecting pipe respectively penetrate the two side walls of the door-shaped plate.

[0025] Furthermore, the cleaning component includes:

[0026] A fixed plate, the fixed plate is fixed on the inner wall of the shell, and a rotating shaft is rotatably arranged on the side wall of the fixed plate, and the rotating shaft passes through the side wall of the shell;

[0027] A cleaning roller is fixedly sleeved on the rotating shaft and is arranged close to the adsorption hole.

[0028] Furthermore, the transmission assembly includes:

[0029] A first bevel gear, wherein the first bevel gear is fixedly sleeved on the rotating shaft;

[0030] The second bevel gear is fixed to the seed suction disc, and the first bevel gear and the second bevel gear are meshed with each other.

[0031] Furthermore, the power assembly includes:

[0032] A bracket, wherein the bracket is fixed on the side wall of the shell;

[0033] A motor, wherein the motor and the bracket are fixed;

[0034] Two second sprockets, wherein the two second sprockets are fixedly connected to the two rotating shafts respectively;

[0035] A first sprocket, wherein the first sprocket is arranged on an output end of the motor;

[0036] Two tension wheels, both of which are rotatably arranged on the side wall of the shell;

[0037] A transmission chain is sleeved on the first sprocket and the two second sprockets, and the transmission chain and the two tensioning wheels are in conflict.

[0038] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0039] The present invention provides two seed suction trays, each of which has a plurality of equally spaced adsorption holes on its side wall. This design not only increases the uniformity of sowing, but also provides a basis for subsequent seed adsorption and release. The introduction of a door-type plate is fixed to the inner wall of the shell and contacts the two seed suction trays, forming a stable seed carrying and separation area, which helps to reduce the disorderly movement of seeds. At the same time, multiple gas delivery components are adopted, which can deliver gas into the door-type plate. By controlling the flow rate and pressure of the gas, precise adjustment of the seed adsorption force on the seed suction tray is achieved. This non-mechanical adjustment method avoids the seed scattering problem caused by increasing the rotation speed of the seed suction tray in the traditional method, thereby significantly reducing the cavity rate and improving the sowing accuracy while ensuring the sowing amount. Two cleaning components are also provided, which realize the cleaning of excess seeds on the seed suction tray through the transmission coordination between the transmission component and the seed suction tray and the drive of the power component. The automatic cleaning of the seeding disc not only reduces the need for manual intervention and improves work efficiency, but also ensures the cleanliness of the surface of the seed suction disc, providing good conditions for the next sowing. The coordinated work of the cleaning component and the transmission component enables the seeding device to maintain stable performance output during continuous sowing, further improving the reliability and consistency of sowing. In summary, the double-chamber double-disc rice seeding device with adjustable sowing amount of the present invention effectively solves the problems of complex sowing amount adjustment, high void rate, poor sowing effect, etc. mentioned in the background technology through innovative double seed suction discs, gas adsorption adjustment, automatic cleaning and other technical features. The beneficial effects are: flexible adjustment and precise control of sowing amount are realized; the void rate is reduced, and sowing accuracy and uniformity are improved; manual intervention is reduced and work efficiency is improved; the stability and reliability of the seeding device are enhanced, providing a more efficient and accurate solution for mechanized rice planting. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0041] Figure 2 It is a schematic diagram of the structure of the housing and the discharge pipe of the present invention;

[0042] Figure 3 It is a schematic diagram of the structure of the first sprocket, the second sprocket and the transmission chain of the present invention;

[0043] Figure 4 It is a schematic diagram of the cross-sectional structure of the shell of the present invention;

[0044] Figure 5 This is a schematic diagram of the structure of the housing and the seed suction tray of the present invention;

[0045] Figure 6 It is a schematic diagram of the structure of the sleeve and the first one-way valve of the present invention;

[0046] Figure 7It is a schematic diagram of the sleeve, sleeve rod and connecting rod structure of the present invention;

[0047] Figure 8 It is a schematic diagram of the cross-sectional structure of the sleeve of the present invention.

[0048] In the figure: 1. shell; 2. feed pipe; 3. sealing cover; 4. discharge pipe; 5. bracket; 6. motor; 7. rotating shaft; 8. first sprocket; 9. second sprocket; 10. tensioning wheel; 11. transmission chain; 12. seed suction disc; 13. adsorption hole; 14. fixing plate; 15. first bevel gear; 16. second bevel gear; 17. cleaning roller; 18. sleeve; 19. transmission disc; 20. door plate; 21. connecting rod; 22. connecting shaft; 23. ear plate; 24. first connecting block; 25. first one-way valve; 26. connecting pipe; 27. second connecting block; 28. second one-way valve; 29. ​​piston. DETAILED DESCRIPTION

[0049] 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.

[0050] Combination Figure 1-Figure 8 As shown, a rice seed metering device with double air chambers and double discs and adjustable seeding amount of the present invention comprises:

[0051] The housing 1 has two seed suction discs 12 rotatably disposed therein, and each seed suction disc 12 has a plurality of equally spaced adsorption holes 13 on its side wall;

[0052] The door plate 20 is fixed on the inner wall of the housing 1, and the two ends of the door plate 20 are respectively in contact with the two seed suction discs 12;

[0053] A plurality of gas delivery components, each of which is arranged on the inner wall of the housing 1, and is used to deliver gas into the door panel 20;

[0054] Two cleaning components, both of which are arranged on the inner wall of the housing 1, and are used to clean the excess seeds on the two seed suction trays 12 respectively;

[0055] Two transmission assemblies, the two transmission assemblies are respectively connected to the two cleaning assemblies, and the two transmission assemblies are respectively matched with the two seed suction discs 12 to form a transmission;

[0056] A power assembly is arranged on the side wall of the housing 1 and is used to drive the two cleaning assemblies to work.

[0057] When the power component is working, it drives the cleaning component to work, and cooperates with the transmission component to realize the rotation of the two seed suction discs 12. The cleaning component cleans the excess seeds on the seed suction discs 12 to ensure the seeding effect;

[0058] When the rotation speed of the seed suction disc 12 increases, the working frequency of the gas conveying component increases, thereby making the air pressure in the low-pressure area between the two seed suction discs 12 lower, and the air pressure in the high-pressure area higher, so as to ensure the adsorption strength of the seeds and the success rate of releasing the seeds, and avoid the deterioration of the seeding effect caused by the increase in the rotation speed of the seed suction disc 12. It should be noted that the area enclosed by the seed suction disc 12 and the shell 1 is a seeding air chamber. Since two seed suction discs 12 are provided, a double air chamber is formed in the entire seeding device. During the seeding process, a high-pressure area is formed in the door plate 20, that is, the seeds are no longer adsorbed and blown away from the seed suction disc 12 and fall into the discharge pipe 4 to realize the seeding work. A negative pressure area is formed in the area outside the door plate 20, so that the seeds are adsorbed on the seed suction disc 12. At the same time, multiple gas conveying components work together during the entire adsorption process, so a sufficiently high negative pressure will be generated to adsorb the seeds, thereby ensuring that the seeds will not separate from the surface of the seed suction disc 12.

[0059] In a preferred embodiment, the present invention can be further configured as follows: Figure 1 As shown; feed pipes 2 are provided through both side walls of the shell 1, sealing covers 3 are hinged on the tops of the two feed pipes 2, and two discharge pipes 4 are provided through the bottom of the shell 1.

[0060] In a preferred embodiment, the present invention can be further configured as follows: Figure 6 , Figure 8 As shown; the gas delivery assembly includes:

[0061] A sleeve 18, the sleeve 18 is fixed on the inner wall of the housing 1, and a piston 29 is slidably arranged in the sleeve 18;

[0062] A first one-way valve 25, which is disposed through the side wall of the sleeve 18;

[0063] A second one-way valve 28, which is disposed through the side wall of the sleeve 18;

[0064] The second connecting block 27 is fixed on the piston 29 , the connecting rod 21 is rotatably provided on the second connecting block 27 , and the first connecting block 24 is rotatably provided on the end of the connecting rod 21 .

[0065] In a preferred embodiment, the present invention can be further configured as follows: Figure 6 , Figure 7 As shown; the gas delivery assembly also includes:

[0066] Two transmission discs 19, the two transmission discs 19 are respectively fixed to the two seed suction discs 12;

[0067] A connecting shaft 22, the connecting shaft 22 and the two transmission discs 19 are fixed, and the connecting shaft 22 is arranged at an eccentric position of the transmission disc 19;

[0068] A plurality of ear plates 23, the plurality of ear plates 23 are fixed on the side wall of the connecting shaft 22 at equal distances, and the plurality of ear plates 23 are rotatably connected to the plurality of first connecting blocks 24 one by one;

[0069] The connecting pipe 26 is connected to a plurality of second one-way valves 28 , and both ends of the connecting pipe 26 respectively penetrate the two side walls of the door panel 20 .

[0070] During the rotation of the seed suction disc 12, the connecting shaft 22 is caused to perform circular motion through the transmission disc 19, so that the distance between the connecting shaft 22 and the sleeve 18 increases and decreases periodically, and then the piston 29 is caused to perform reciprocating motion in the sleeve 18 through the transmission of the ear plate 23, the first connecting block 24, the connecting rod 21 and the second connecting block 27, so that the volume of the space enclosed by the piston 29 and the sleeve 18 increases and decreases periodically;

[0071] When the volume of the space increases, the gas between the two seed suction trays 12 in the shell 1 enters the space through the first one-way valve 25. Conversely, when the volume of the space decreases, the gas in the space enters the connecting pipe 26 through the second one-way valve 28, and finally enters the space enclosed by the shell 1, the door plate 20 and the two seed suction trays 12, so that the air pressure in the space rises, thereby realizing the existence of low-pressure and high-pressure areas between the two seed suction trays 12.

[0072] In a preferred embodiment, the present invention can be further configured as follows: Figure 4 As shown; the cleaning components include:

[0073] A fixing plate 14, the fixing plate 14 is fixed on the inner wall of the housing 1, a rotating shaft 7 is rotatably provided on the side wall of the fixing plate 14, and the rotating shaft 7 passes through the side wall of the housing 1;

[0074] The cleaning roller 17 is fixedly sleeved on the rotating shaft 7 and is arranged close to the adsorption hole 13 .

[0075] The transmission components include:

[0076] A first bevel gear 15, the first bevel gear 15 is fixedly sleeved on the rotating shaft 7;

[0077] The second bevel gear 16 is fixed to the seed suction disc 12, and the first bevel gear 15 and the second bevel gear 16 are meshed with each other.

[0078] During the rotation of the rotating shaft 7, the seed suction disc 12 is driven to rotate via the first bevel gear 15 and the second bevel gear 16.

[0079] In a preferred embodiment, the present invention can be further configured as follows: Figure 1 , Figure 2 and Figure 3 As shown; the power components include:

[0080] A bracket 5, wherein the bracket 5 is fixed on the side wall of the housing 1;

[0081] The motor 6 is fixed to the bracket 5;

[0082] Two second sprockets 9, the two second sprockets 9 are fixedly connected to the two rotating shafts 7 respectively;

[0083] A first sprocket 8, which is arranged on the output end of the motor 6;

[0084] Two tension wheels 10, both of which are rotatably arranged on the side wall of the housing 1;

[0085] The transmission chain 11 is sleeved on the first sprocket 8 and the two second sprockets 9 , and the transmission chain 11 and the two tensioning wheels 10 are in conflict with each other.

[0086] When the switch of the motor 6 is turned on, the motor 6 drives the first sprocket 8 to rotate. Under the action of the transmission chain 11, the two second sprockets 9 rotate synchronously, thereby driving the rotating shaft 7 to rotate.

[0087] The specific working principle of the double-air-chamber double-disc rice seeding device with adjustable sowing amount of the present invention is as follows:

[0088] First, open the sealing cover 3, input the seeds into the housing 1 through the feeding pipe 2, and repeat this step until both sides of the housing 1 are filled with seeds;

[0089] Next, the switch of the motor 6 is turned on. When the motor 6 is working, it drives the first sprocket 8 to rotate. Under the action of the transmission chain 11, the two second sprockets 9 rotate synchronously, thereby driving the rotating shaft 7 to rotate. During the rotation of the rotating shaft 7, the seed suction disc 12 is driven to rotate through the first bevel gear 15 and the second bevel gear 16;

[0090] During the rotation of the seed suction disc 12, the connecting shaft 22 is caused to perform circular motion through the transmission disc 19, so that the distance between the connecting shaft 22 and the sleeve 18 increases and decreases periodically, and then the piston 29 is caused to perform reciprocating motion in the sleeve 18 through the transmission of the ear plate 23, the first connecting block 24, the connecting rod 21 and the second connecting block 27, so that the volume of the space enclosed by the piston 29 and the sleeve 18 increases and decreases periodically;

[0091] When the volume of the space increases, the gas between the two seed suction discs 12 in the housing 1 enters the space through the first one-way valve 25. Conversely, when the volume of the space decreases, the gas in the space enters the connecting pipe 26 through the second one-way valve 28, and finally enters the space enclosed by the housing 1, the door plate 20 and the two seed suction discs 12, so that the air pressure in the space rises, thereby realizing the existence of a low-pressure area and a high-pressure area between the two seed suction discs 12.

[0092] During the rotation of the seed suction disc 12, the low-pressure area generates negative pressure at the adsorption hole 13 to adsorb seeds. As the seed suction disc 12 rotates, when the adsorption hole 13 moves to the cleaning roller 17, the rotating cleaning roller 17 cleans the excess seeds on the adsorption hole 13 to ensure accurate seeding.

[0093] As the seed suction disc 12 rotates, when the adsorption holes 13 enter the high-pressure area, the gas is output through the adsorption holes 13, and then the seeds are blown away from the seed suction disc 12 and fall into the discharge pipe 4 to achieve seed discharge;

[0094] Finally, by controlling the rotation speed of the motor 6, the number of seeds output per unit time can be achieved, thereby realizing the adjustment of the sowing amount. Since the rotation speed of the transmission disk 19 is synchronized with the rotation speed of the seed suction disk 12, when the rotation speed of the seed suction disk 12 increases, the rotation speed of the transmission disk 19 also increases synchronously, thereby making the air pressure in the low-pressure area between the two seed suction disks 12 lower, and the air pressure in the high-pressure area higher, so as to ensure the adsorption strength of the seeds and the success rate of releasing the seeds, and avoid the deterioration of the seeding effect due to the increase in the rotation speed of the seed suction disk 12.

[0095] 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 "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0096] 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 rice seed metering device with double air chambers and double discs and adjustable seeding rate, characterized in that: include: A shell (1), wherein two seed suction discs (12) are rotatably arranged inside the shell (1), and a side wall of each seed suction disc (12) is provided with a plurality of adsorption holes (13) distributed at equal distances; A door-shaped plate (20), wherein the door-shaped plate (20) is fixed on the inner wall of the housing (1), and two ends of the door-shaped plate (20) are respectively in contact with the two seed suction discs (12); A plurality of gas delivery components, each of which is arranged on the inner wall of the housing (1), and is used to deliver gas into the door panel (20); Two cleaning assemblies, both of which are arranged on the inner wall of the housing (1), and are used to clean excess seeds on two seed suction trays (12) respectively; Two transmission components, the two transmission components are respectively connected to the two cleaning components, and the two transmission components are respectively in transmission coordination with the two seed suction discs (12); A power assembly is arranged on the side wall of the housing (1), and is used to drive the two cleaning assemblies to work.

2. A rice seed metering device with double air chambers and double discs and adjustable seeding amount according to claim 1, characterized in that: Feed pipes (2) are provided through both side walls of the shell (1), sealing covers (3) are hinged at the top ends of the two feed pipes (2), and two discharge pipes (4) are provided through the bottom of the shell (1).

3. The rice seed metering device with double air chambers and double discs and adjustable sowing amount according to claim 1, characterized in that: The gas delivery assembly comprises: A sleeve (18), wherein the sleeve (18) is fixed on the inner wall of the housing (1), and a piston (29) is slidably arranged in the sleeve (18); A first one-way valve (25), the first one-way valve (25) being arranged through the side wall of the sleeve (18); a second one-way valve (28), the second one-way valve (28) being disposed through the side wall of the sleeve (18); A second connecting block (27), the second connecting block (27) is fixed on the piston (29), a connecting rod (21) is rotatably arranged on the second connecting block (27), and a first connecting block (24) is rotatably arranged on the end of the connecting rod (21).

4. A rice seed metering device with double air chambers and double discs and adjustable seeding amount according to claim 3, characterized in that: The gas delivery assembly also includes: Two transmission discs (19), the two transmission discs (19) are respectively fixed to the two seed suction discs (12); A connecting shaft (22), wherein the connecting shaft (22) and the two transmission discs (19) are fixed, and the connecting shaft (22) is arranged at an eccentric position of the transmission disc (19); A plurality of ear plates (23), wherein the plurality of ear plates (23) are fixed on the side wall of the connecting shaft (22) at equal distances, and the plurality of ear plates (23) and the plurality of first connecting blocks (24) are rotatably connected one to one; A connecting pipe (26), the connecting pipe (26) being in communication with a plurality of second one-way valves (28), and the two ends of the connecting pipe (26) respectively passing through the two side walls of the door-shaped plate (20).

5. The rice seed metering device with double air chambers and double discs and adjustable seeding amount according to claim 1, characterized in that: The cleaning assembly comprises: A fixing plate (14), the fixing plate (14) being fixed on the inner wall of the housing (1), a rotating shaft (7) being rotatably arranged on the side wall of the fixing plate (14), and the rotating shaft (7) passing through the side wall of the housing (1); A cleaning roller (17) is fixedly sleeved on the rotating shaft (7), and the cleaning roller (17) is arranged close to the adsorption hole (13).

6. A rice seed metering device with double air chambers and double discs and adjustable seeding amount according to claim 5, characterized in that: The transmission assembly comprises: A first bevel gear (15), wherein the first bevel gear (15) is fixedly sleeved on the rotating shaft (7); The second bevel gear (16) is fixed to the seed suction disc (12), and the first bevel gear (15) and the second bevel gear (16) are meshed with each other.

7. The rice seed metering device with double air chambers and double discs and adjustable sowing amount according to claim 5, characterized in that: The power assembly comprises: A bracket (5), wherein the bracket (5) is fixed on a side wall of the housing (1); A motor (6), wherein the motor (6) and the bracket (5) are fixed; Two second sprockets (9), wherein the two second sprockets (9) are fixedly connected to the two rotating shafts (7) respectively; A first sprocket (8), wherein the first sprocket (8) is arranged on an output end of the motor (6); Two tension wheels (10), both of which are rotatably arranged on the side wall of the housing (1); A transmission chain (11) is sleeved on a first sprocket (8) and two second sprockets (9), and the transmission chain (11) and the two tension wheels (10) are in conflict with each other.

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