Large farm vehicle transmission with automatic load shedding

Abstract

The application discloses a large agricultural vehicle transmission device capable of automatically switching loads, solves the problem that the resistance of different lands to plowing equipment is different, and makes the plowing efficiency affected, and comprises an agricultural vehicle and a rotating roller rotatably installed at the front end of the agricultural vehicle, the outer side of the rotating roller is uniformly provided with ploughing blades, one end of the rotating roller is provided with a driving assembly, the driving assembly is used for driving the rotating roller to rotate, the other end of the rotating roller is provided with an auxiliary driving assembly, the auxiliary driving assembly is used for compensating the rotating force of the rotating roller according to the load, and the auxiliary driving assembly comprises a second driving wheel fixedly installed at one end of the rotating roller, and a second driven wheel rotatably installed on the agricultural vehicle; in the working process, the friction resistance of the upper friction wheel to the lower friction wheel is set, the rotating roller is assisted to rotate, the rotating roller is assisted to rotate under different load conditions, and the agricultural vehicle is convenient to use.

Description

Technical Field

[0001] This invention belongs to the field of agricultural machinery and vehicle technology, specifically a transmission device for large agricultural machinery and vehicles that can automatically switch loads. Background Technology

[0002] Tillage machinery refers to mechanical equipment used in agricultural production for a series of operations such as tilling, loosening soil, sowing, fertilizing, weeding, and harvesting. The emergence of these agricultural machines has greatly improved agricultural production efficiency and reduced the labor intensity of farmers. Tillers, in particular, can turn the soil over, mixing underground weeds, residues, and fertilizers into the soil, improving soil aeration and water retention. This makes the land more suitable for cultivation. A typical tillage machine consists of a rotating roller, tilling blades outside the roller, and a drive mechanism mounted on the machine. As the roller rotates, it drives the tilling blades to turn the soil. However, it has the following drawbacks:

[0003] When agricultural machinery plows the land, the soil hardness varies in different locations, resulting in varying resistance to the tillage blades. This leads to different loads and plowing speeds in different locations, affecting the efficiency and speed of tillage. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a transmission device for large agricultural machinery vehicles that can automatically switch loads, which effectively solves the problem that different types of land have different resistance to tillage equipment, thus affecting tillage efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a large agricultural vehicle transmission device capable of automatically switching loads, comprising an agricultural vehicle and a rotating roller rotatably mounted on the front end of the agricultural vehicle, wherein tillage blades are uniformly mounted on the outer side of the rotating roller, an active drive component is mounted on one end of the rotating roller for driving the rotating roller to rotate, and an auxiliary drive component is mounted on the other end of the rotating roller for compensating the rotational force of the rotating roller according to the load.

[0006] The auxiliary drive assembly includes a second drive wheel fixedly mounted on one end of a rotating roller, a second driven wheel rotatably mounted on the agricultural vehicle, a second transmission belt mounted on the outer side of the second drive wheel and the second driven wheel, a connecting shaft coaxially mounted on one side of the second driven wheel, a lower friction wheel mounted on one end of the connecting shaft, an upper friction wheel positioned above the lower friction wheel, the outer wall of the upper friction wheel being in close contact with the outer wall of the lower friction wheel, one end of the upper friction wheel being fixedly connected to the output shaft of the auxiliary drive motor, the auxiliary drive motor being fixedly mounted on the agricultural vehicle, and an auxiliary rotation control unit mounted on the outer side of the connecting shaft.

[0007] Preferably, the active drive assembly includes a first drive wheel fixedly installed on the end of the rotating roller away from the second drive wheel, a first driven wheel rotatably installed on the agricultural vehicle, a first transmission belt installed on the outer side of the first drive wheel and the first driven wheel, a lower transmission gear coaxially installed on the first driven wheel, an upper transmission gear meshing above the lower transmission gear, the upper transmission gear being fixedly connected to the output shaft of the active drive motor, and the active drive motor being installed on the agricultural vehicle.

[0008] Preferably, the auxiliary rotation control unit includes a top block disposed above the connecting shaft, side blocks symmetrically mounted at both ends of the top block, the side blocks being fixedly mounted on the agricultural vehicle, a front groove being provided at one end of the top block, mounting plates symmetrically mounted at the bottom end of the top block, a rotating wheel being disposed between the two mounting plates, the rotating shaft of the rotating wheel being rotatably connected to the mounting plate, the bottom wall of the rotating wheel being in close contact with the top wall of the connecting shaft, a current control unit being installed inside the top block, and a clamping and fixing unit being installed inside the side blocks.

[0009] Preferably, a lower gear is installed at one end of the rotating shaft of the rotating wheel, and an upper gear is meshed above the lower gear. The upper gear is rotatably mounted on the mounting plate and is located inside the connecting groove. The connecting groove is opened at the bottom end of the front groove. A rotating ring is provided inside the front groove, and teeth are installed at equal angles on the outer wall of the rotating ring. The upper gear meshes with the teeth.

[0010] Preferably, the current control unit includes a movable groove inside the top block, one end of which extends through the front groove and is coaxially arranged with the rotating ring. The other end of the movable groove has a through hole at an equal angle. A piston is movably installed inside the movable groove. A return spring is installed on the side of the piston away from the front groove, and one end of the return spring is fixedly connected to the inner wall of the end of the movable groove away from the front groove.

[0011] Preferably, a crossbar is fixedly installed on the side of the piston away from the front groove, a longitudinal rod is installed at the end of the crossbar located outside the top block, a sliding rheostat is fixedly installed at the top of the top block, a connecting rod is fixedly installed at the top of the longitudinal rod, the connecting rod is fixedly connected to the conductive slider of the sliding rheostat, and the sliding rheostat is connected in series with the auxiliary drive motor.

[0012] Preferably, a rotating sleeve is installed on the side of the reset spring near the movable groove. The rotating sleeve is located inside the movable groove and on the side of the piston away from the front groove. A limiting ring is fixedly installed on the outer wall of the rotating sleeve. The limiting ring is rotatably installed inside the limiting ring groove, which is opened on the inner wall of the movable groove. Fan blades are installed at equal angles on the inner wall of the rotating sleeve.

[0013] Preferably, the clamping and fixing unit includes an internal groove symmetrically opened inside the side block, an internal plate is movably installed inside the internal groove, a pull rod is fixedly installed at the top of the internal plate, the top of the pull rod extends through to the top of the side block, a clamping plate is fixedly installed at the top of the pull rod, and a pressure block is fixedly installed at the top of the connecting rod, with the pressure block located below the clamping plate.

[0014] Preferably, compression springs are symmetrically installed at the bottom end of the inner plate, the bottom end of the compression springs is fixedly connected to the inner bottom wall of the inner groove, a magnetic block is fixedly installed at the bottom end of the inner plate, and an electromagnet is fixedly installed on the inner bottom wall of the inner groove.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1) During operation, the active drive motor drives the rotating roller, while the other end of the rotating roller is equipped with a second drive wheel. The second drive wheel and the second driven wheel are connected by a second transmission belt. A lower friction wheel is installed on the second driven wheel. The lower friction wheel is in close contact with the outer wall of the upper friction wheel on the output shaft of the auxiliary drive motor. The auxiliary drive motor can drive the upper friction wheel to rotate. The frictional resistance between the upper friction wheel and the lower friction wheel provides an auxiliary rotation effect for the rotating roller. This facilitates the auxiliary rotation of the rotating roller under different load conditions, making it convenient for agricultural machinery vehicles to use.

[0017] 2) During operation, the rotating wheel at the bottom of the top block is in close contact with the outer wall of the connecting shaft. When the rotating roller rotates, it drives the connecting shaft to rotate, which in turn drives the rotating ring to rotate. The fan blades generate air pressure on the piston side, which adjusts the position of the conductive slider on the sliding rheostat. The smaller the rotation speed of the rotating roller, the smaller the resistance of the sliding rheostat connected to the circuit, which makes the output shaft of the auxiliary drive motor rotate faster. This makes the auxiliary rotation force of the upper friction wheel on the rotating roller greater, so that the auxiliary rotation effect of the upper friction wheel on the rotating roller is better when the load is larger.

[0018] 3) During operation, after the piston position is stabilized, the electromagnet is energized. The electromagnet attracts the magnetic block, which in turn moves the internal plate downward, thereby pulling the pressure plate downward. The connecting rod is equipped with a pressure block, which is pressed and fixed after the pressure plate moves downward. This makes it easier to fix the position of the conductive slider on the sliding rheostat, ensuring the auxiliary effect of the upper friction wheel on the rotating roller during the tillage process. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0020] In the attached diagram:

[0021] Figure 1 This is a schematic diagram of the transmission device for large agricultural machinery vehicles that can automatically switch loads according to the present invention.

[0022] Figure 2 This is a schematic diagram of the auxiliary drive component structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the auxiliary rotation control unit of the present invention;

[0024] Figure 4 This is a schematic diagram of the current control unit structure of the present invention;

[0025] Figure 5 This is a schematic diagram of the internal structure of the movable groove of the present invention;

[0026] Figure 6 This is a schematic diagram of the rotating ring structure of the present invention;

[0027] Figure 7 This is a schematic diagram of the clamping and fixing unit structure of the present invention.

[0028] In the diagram: 1. Rotating roller; 2. Tillage blade; 3. Active drive assembly; 301. First driving wheel; 302. First driven wheel; 303. First transmission belt; 304. Lower transmission gear; 305. Upper transmission gear; 306. Active drive motor; 4. Auxiliary drive assembly; 401. Second driving wheel; 402. Second driven wheel; 403. Second transmission belt; 404. Connecting shaft; 405. Lower friction wheel; 406. Upper friction wheel; 407. Auxiliary drive motor; 408. Auxiliary rotation control unit; 4081. Top block; 4082. Side block; 4083. Front groove; 4084. Mounting plate; 4085. Rotating wheel; 4086. Lower gear; 4087. 4088. Connecting slot; 4089. Upper gear; 40810. Rotating ring; 40810. Tooth; 409. Current control unit; 4091. Movable slot; 4092. Through hole; 4093. Piston; 4094. Crossbar; 4095. Vertical bar; 4096. Sliding rheostat; 4097. Connecting rod; 4098. Return spring; 4099. Limiting ring slot; 40910. Rotating sleeve; 40911. Limiting rotating ring; 40912. Fan blade; 410. Pressing and fixing unit; 4101. Pressing block; 4102. Internal slot; 4103. Internal plate; 4104. Pull rod; 4105. Pressing plate; 4106. Pressing spring; 4107. Magnetic block; 4108. Electromagnet. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] Depend on Figure 1-7 The present invention relates to a transmission device for a large agricultural vehicle capable of automatically switching loads, comprising an agricultural vehicle and a rotating roller 1 rotatably mounted on the front end of the agricultural vehicle. Tillage blades 2 are evenly mounted on the outer side of the rotating roller 1. An active drive assembly 3 is mounted on one end of the rotating roller 1 for driving the rotating roller 1 to rotate. An auxiliary drive assembly 4 is mounted on the other end of the rotating roller 1 for compensating the rotational force of the rotating roller 1 according to the load. The active drive assembly 3 includes a first drive wheel 301 fixedly mounted on the end of the rotating roller 1 away from the second drive wheel 401. A first driven wheel 302 is rotatably mounted on the agricultural vehicle. A first transmission belt 303 is mounted on the outer side of the first drive wheel 301 and the first driven wheel 302. A lower transmission gear 304 is coaxially mounted on the first driven wheel 302. An upper transmission gear 305 is meshed above the lower transmission gear 304. The upper transmission gear 305 is fixedly connected to the output shaft of an active drive motor 306, which is mounted on the agricultural vehicle.

[0031] The auxiliary drive assembly 4 includes a second driving wheel 401 fixedly mounted on one end of the rotating roller 1, a second driven wheel 402 rotatably mounted on the agricultural vehicle, a second transmission belt 403 mounted on the outer sides of the second driving wheel 401 and the second driven wheel 402, a connecting shaft 404 coaxially mounted on one side of the second driven wheel 402, a lower friction wheel 405 mounted on one end of the connecting shaft 404, an upper friction wheel 406 positioned above the lower friction wheel 405, the outer wall of the upper friction wheel 406 closely fitting the outer wall of the lower friction wheel 405, one end of the upper friction wheel 406 fixedly connected to the output shaft of the auxiliary drive motor 407, the auxiliary drive motor 407 fixedly mounted on the agricultural vehicle, and an auxiliary drive belt 403 mounted on the outer side of the connecting shaft 404. The rotation control unit 408 and the active drive motor 306 drive the rotating roller 1. The other end of the rotating roller 1 is provided with a second drive wheel 401. The second drive wheel 401 and the second driven wheel 402 are connected by a second transmission belt 403. A lower friction wheel 405 is installed on the second driven wheel 402. The lower friction wheel 405 is in close contact with the outer wall of the upper friction wheel 406 on the output shaft of the auxiliary drive motor 407. The auxiliary drive motor 407 can drive the upper friction wheel 406 to rotate. The frictional resistance of the upper friction wheel 406 on the lower friction wheel 405 provides an auxiliary rotation effect for the rotating roller 1, which is convenient for the use of agricultural machinery vehicles under different load conditions.

[0032] The auxiliary rotation control unit 408 includes a top block 4081 disposed above the connecting shaft 404. Side blocks 4082 are symmetrically mounted at both ends of the top block 4081 and are fixedly mounted on the agricultural vehicle. A front groove 4083 is formed at one end of the top block 4081. Mounting plates 4084 are symmetrically mounted at the bottom end of the top block 4081. A rotating wheel 4085 is disposed between the two mounting plates 4084. The shaft of the rotating wheel 4085 is rotatably connected to the mounting plate 4084. The bottom wall of the rotating wheel 4085 is in close contact with the top wall of the connecting shaft 404. A current control unit is installed inside the top block 4081. The control unit 409 has a clamping and fixing unit 410 installed inside the side block 4082. A lower gear 4086 is installed at one end of the rotating shaft of the rotating wheel 4085. An upper gear 4088 is meshed above the lower gear 4086. The upper gear 4088 is rotatably mounted on the mounting plate 4084 and is located inside the connecting groove 4087. The connecting groove 4087 is opened at the bottom end of the front groove 4083. A rotating ring 4089 is provided inside the front groove 4083. Teeth 40810 are installed at equal angles on the outer wall of the rotating ring 4089. The upper gear 4088 meshes with the teeth 40810.

[0033] The current control unit 409 includes a movable groove 4091 formed inside the top block 4081. One end of the movable groove 4091 extends through the front groove 4083, and the movable groove 4091 is coaxially arranged with the rotating ring 4089. The other end of the movable groove 4091 has a through hole 4092 formed at equal angles. A piston 4093 is movably installed inside the movable groove 4091. A return spring 4098 is installed on the side of the piston 4093 away from the front groove 4083. One end of the return spring 4098 is fixedly connected to the inner wall of the end of the movable groove 4091 away from the front groove 4083. A crossbar 4094 is fixedly installed on the side of piston 4093 away from front groove 4083. A longitudinal rod 4095 is installed on the end of crossbar 4094 outside top block 4081. A sliding rheostat 4096 is fixedly installed on the top of top block 4081. A connecting rod 4097 is fixedly installed on the top of longitudinal rod 4095. The connecting rod 4097 is fixedly connected to the conductive slider of sliding rheostat 4096. Sliding rheostat 4096 is connected in series with auxiliary drive motor 407. A rotating sleeve 4091 is installed on the side of return spring 4098 near movable groove 4091. 0. The rotating sleeve 40910 is located inside the movable groove 4091, and the rotating sleeve 40910 is located on the side of the piston 4093 away from the front groove 4083. A limiting ring 40911 is fixedly installed on the outer wall of the rotating sleeve 40910. The limiting ring 40911 is rotatably installed inside the limiting ring groove 4099. The limiting ring groove 4099 is opened on the inner wall of the movable groove 4091. Fan blades 40912 are installed at equal angles on the inner wall of the rotating sleeve 40910. The rotating wheel 4085 at the bottom of the top block 4081 is in close contact with the outer wall of the connecting shaft 404. When the rotating roller 1 rotates... When in motion, it drives the connecting shaft 404 to rotate, which in turn drives the rotating ring 4089 to rotate through the rotating wheel 4085. The fan blade 40912 generates air pressure on one side of the piston 4093, which adjusts the position of the conductive slider on the sliding rheostat 4096. The smaller the rotation speed of the rotating roller 1, the smaller the resistance value of the circuit connected to the sliding rheostat 4096, which makes the output shaft of the auxiliary drive motor 407 rotate faster. This makes the auxiliary rotation force of the upper friction wheel 406 on the rotating roller 1 greater, so that the auxiliary rotation effect of the upper friction wheel 406 on the rotating roller 1 is better when the load is larger.

[0034] The clamping and fixing unit 410 includes internal grooves 4102 symmetrically opened inside the side block 4082. An internal plate 4103 is movably installed inside the internal groove 4102. A pull rod 4104 is fixedly installed at the top of the internal plate 4103, and the top of the pull rod 4104 extends through to the top of the side block 4082. A clamping plate 4105 is fixedly installed at the top of the pull rod 4104. A pressure block 4101 is fixedly installed at the top of the connecting rod 4097, and the pressure block 4101 is located below the clamping plate 4105. A clamping spring 4106 is symmetrically installed at the bottom end of the internal plate 4103, and the bottom end of the clamping spring 4106 is fixedly connected to the inner bottom wall of the internal groove 4102. A magnetic block 4107 is fixedly installed at the bottom, and an electromagnet 4108 is fixedly installed on the inner bottom wall of the internal groove 4102. After the piston 4093 is stabilized, the electromagnet 4108 is energized, and the electromagnet 4108 attracts the magnetic block 4107. Under the action of the attraction, the internal plate 4103 is moved downward, thereby pulling the pressing plate 4105 downward. A pressure block 4101 is installed on the connecting rod 4097. After the pressing plate 4105 moves downward, the position of the pressure block 4101 is pressed and fixed, which facilitates the fixing of the position of the conductive slider on the sliding rheostat 4096, ensuring the auxiliary effect of the upper friction wheel 406 on the rotating roller 1 during the tillage process.

[0035] Working principle: When the agricultural machinery is tilling the land, the different hardness of the land at different locations results in different resistance to the tilling blades 2, which in turn results in different loads on the land at different locations, and thus different tilling speeds. When tilling, the active drive motor 306 is turned on, causing the upper transmission gear 305 to rotate, which in turn drives the first driven wheel 302 to rotate through the lower transmission gear 304. This, in turn, drives the rotating roller 1 to rotate through the first transmission belt 303 and the first drive wheel 301. When the rotating roller 1 rotates, the tilling blades 2 on the outer surface of the rotating roller 1 till the land.

[0036] When the rotating roller 1 rotates, the second driven roller 402 rotates via the second driving wheel 401 and the second transmission belt 403, which in turn drives the lower friction wheel 405 to rotate continuously. Since the rotating wheel 4085 at the bottom of the top block 4081 is in close contact with the connecting shaft 404, the rotation of the connecting shaft 404 drives the rotating wheel 4085 to rotate, which in turn causes the lower gear 4086 to rotate. An upper gear 4088 is meshed above the lower gear 4086. The upper gear 4088 meshes with the teeth 40810 on the outer wall of the rotating ring 4089, thereby driving the rotating ring 4089 to rotate. During the rotation of 4089, the rotating sleeve 40910 is driven to rotate continuously. When the fan blade 40912 moves the outside air towards the inside of the movable groove 4091 along with the rotating sleeve 40910, it generates pressure on the end of the piston 4093. The greater the rotation speed of the rotating ring 4089, the greater the air pressure on the side of the piston 4093. After the piston 4093 moves, the conductive slider on the sliding rheostat 4096 moves through the cross rod 4094, the vertical rod 4095 and the connecting rod 4097. The farther the conductive slider moves, the greater the resistance of the sliding rheostat 4096 connected to the circuit.

[0037] Once the rotational speed of the rotating roller 1 stabilizes, the switch for the auxiliary drive motor 407 is turned on, causing the output shaft of the auxiliary drive motor 407 to rotate, which in turn causes the upper friction wheel 406 to rotate. Since the sliding rheostat 4096 is connected in series with the auxiliary drive motor 407, the faster the rotating roller 1 rotates, the greater the resistance of the sliding rheostat 4096 in the circuit, resulting in a faster rotational speed of the upper friction wheel 406. Conversely, the slower the rotating roller 1 rotates, the smaller the resistance of the sliding rheostat 4096 in the circuit, resulting in a slower rotational speed of the upper friction wheel 406. The upper friction wheel 406 and the lower... Friction wheels 405 are in close contact. The greater the rotation speed of the upper friction wheel 406, the greater the auxiliary rotational force of the friction force of the upper friction wheel 406 on the lower friction wheel 405. The smaller the rotation speed of the upper friction wheel 406, the smaller the auxiliary rotational force of the friction force of the upper friction wheel 406 on the lower friction wheel 405. When generating auxiliary rotational force on the lower friction wheel 405, it plays an auxiliary driving force role on the rotating roller 1. This allows the rotating roller 1 to play a relatively auxiliary rotational force when tilling harder soil, which facilitates automatic adjustment of tillage effect under different load conditions.

[0038] After the piston 4093 stabilizes, the electromagnet 4108 is energized to attract the magnetic block 4107. Under the action of the attraction, the internal plate 4103 moves downward, which in turn pulls the pressing plate 4105 downward through the pull rod 4104. This causes the pressing plate 4105 to press against the top wall of the pressure block 4101, thereby pressing and fixing the conductive slider on the sliding rheostat 4096. This ensures that the auxiliary drive motor 407 provides auxiliary rotational force to the rotating roller 1 during the tillage process.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A transmission device for large agricultural machinery vehicles capable of automatically switching loads, comprising an agricultural machinery vehicle and a rotating roller rotatably mounted at the front end of the agricultural machinery vehicle, characterized in that: Tillage blades are evenly installed on the outer side of the rotating roller. An active drive component is installed at one end of the rotating roller to drive the rotating roller to rotate. An auxiliary drive component is installed at the other end of the rotating roller to compensate for the rotational force of the rotating roller according to the load. The auxiliary drive assembly includes a second drive wheel fixedly mounted on one end of a rotating roller, a second driven wheel rotatably mounted on the agricultural vehicle, a second transmission belt mounted on the outer side of the second drive wheel and the second driven wheel, a connecting shaft coaxially mounted on one side of the second driven wheel, a lower friction wheel mounted on one end of the connecting shaft, an upper friction wheel positioned above the lower friction wheel, the outer wall of the upper friction wheel being in close contact with the outer wall of the lower friction wheel, one end of the upper friction wheel being fixedly connected to the output shaft of the auxiliary drive motor, the auxiliary drive motor being fixedly mounted on the agricultural vehicle, and an auxiliary rotation control unit mounted on the outer side of the connecting shaft. The auxiliary rotation control unit includes a top block disposed above the connecting shaft, side blocks symmetrically mounted at both ends of the top block, the side blocks being fixedly mounted on the agricultural vehicle, a front groove being opened at one end of the top block, mounting plates symmetrically mounted at the bottom end of the top block, a rotating wheel being disposed between the two mounting plates, the rotating shaft of the rotating wheel being rotatably connected to the mounting plate, the bottom wall of the rotating wheel being tightly attached to the top wall of the connecting shaft, a current control unit being installed inside the top block, and a clamping and fixing unit being installed inside the side blocks; The current control unit includes a movable slot opened inside the top block. One end of the movable slot extends through the front slot and is coaxial with the rotating ring. The other end of the movable slot has through holes opened at equal angles. A piston is movably installed inside the movable slot. A return spring is installed on the side of the piston away from the front slot. One end of the return spring is fixedly connected to the inner wall of the end of the movable slot away from the front slot. A crossbar is fixedly installed on the side of the piston away from the front groove. A longitudinal rod is installed at the end of the crossbar located outside the top block. A sliding rheostat is fixedly installed at the top of the top block. A connecting rod is fixedly installed at the top of the longitudinal rod. The connecting rod is fixedly connected to the conductive slider of the sliding rheostat. The sliding rheostat is connected in series with the auxiliary drive motor.

2. The large agricultural machinery transmission device capable of automatically switching loads according to claim 1, characterized in that: The active drive assembly includes a first drive wheel fixedly installed on the end of the rotating roller away from the second drive wheel, a first driven wheel rotatably installed on the agricultural vehicle, a first transmission belt installed on the outer side of the first drive wheel and the first driven wheel, a lower transmission gear coaxially installed on the first driven wheel, an upper transmission gear meshing above the lower transmission gear, the upper transmission gear being fixedly connected to the output shaft of the active drive motor, and the active drive motor being installed on the agricultural vehicle.

3. The large agricultural machinery transmission device capable of automatically switching loads according to claim 1, characterized in that: The rotating wheel has a lower gear installed at one end of its shaft, and an upper gear meshes with the upper gear above it. The upper gear is rotatably mounted on the mounting plate and is located inside the connecting groove. The connecting groove is opened at the bottom of the front groove. A rotating ring is provided inside the front groove, and teeth are installed at equal angles on the outer wall of the rotating ring. The upper gear meshes with the teeth.

4. The large agricultural machinery transmission device capable of automatically switching loads according to claim 1, characterized in that: A rotating sleeve is installed on the side of the reset spring near the movable groove. The rotating sleeve is located inside the movable groove and on the side of the piston away from the front groove. A limiting ring is fixedly installed on the outer wall of the rotating sleeve. The limiting ring is rotatably installed inside the limiting ring groove. The limiting ring groove is opened on the inner wall of the movable groove. Fan blades are installed at equal angles on the inner wall of the rotating sleeve.

5. The large agricultural machinery transmission device capable of automatically switching loads according to claim 1, characterized in that: The clamping and fixing unit includes an internal groove symmetrically opened inside the side block. An internal plate is movably installed inside the internal groove. A pull rod is fixedly installed at the top of the internal plate. The top of the pull rod extends through to the top of the side block. A clamping plate is fixedly installed at the top of the pull rod. A pressure block is fixedly installed at the top of the connecting rod. The pressure block is located below the clamping plate.

6. The large agricultural machinery transmission device capable of automatically switching loads according to claim 5, characterized in that: A compression spring is symmetrically installed at the bottom end of the inner plate. The bottom end of the compression spring is fixedly connected to the inner bottom wall of the inner groove. A magnetic block is fixedly installed at the bottom end of the inner plate. An electromagnet is fixedly installed on the inner bottom wall of the inner groove.

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