Large agricultural vehicle transmission device capable of automatically switching loads

Abstract

The invention discloses a large agricultural machine vehicle transmission device capable of automatically switching loads, which solves the problem that the ploughing efficiency is affected due to the fact that different lands have different resistances to ploughing equipment, and comprises an agricultural machine vehicle and a rotating roller rotationally mounted at the front end of the agricultural machine vehicle, ploughing blades are uniformly mounted on the outer side of the rotating roller, and the inner side of the rotating roller is provided with a load switching device. An active driving assembly is installed at one end of the rotating roller and used for driving the rotating roller to rotate, and an auxiliary driving assembly is installed at the other end of the rotating roller and used for compensating rotating force of the rotating roller according to loads and comprises a second driving wheel fixedly installed at one end of the rotating roller; a second driven wheel is rotationally mounted on the agricultural vehicle; in the working process, the friction resistance of the upper friction wheel to the lower friction wheel achieves the auxiliary rotation effect on the rotating roller, the auxiliary rotation effect on the rotating roller is conveniently achieved under different load conditions, and the agricultural vehicle is convenient to use.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural machinery vehicles, and in particular relates to a transmission device for a large agricultural machinery vehicle capable of automatically switching loads. Background Art

[0002] Agricultural machinery refers to mechanical equipment used for a series of operations in agricultural production, such as tilling, loosening the soil, sowing, fertilizing, weeding, and harvesting. The emergence of these agricultural machinery and equipment has greatly improved agricultural production efficiency and reduced the labor intensity of farmers. Among them, the tiller can turn the soil, mix underground weeds, residues and fertilizers into the soil, improve soil aeration and water retention, and make it necessary to use it when cultivating the land. The tilling equipment of a general tiller consists of a rotating roller, a tilling blade outside the rotating roller, and a drive device installed on the agricultural machinery vehicle. When the rotating roller rotates, it drives the tilling blade to till the land. However, it has the following defects:

[0003] When agricultural machinery vehicles are plowing the land, the hardness of the land at different locations is different, which makes the resistance of the land to the plowing blades different, resulting in different loads on the land at different locations and different plowing speeds at different locations, affecting the plowing efficiency and speed of the land at different locations. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a large agricultural vehicle transmission device that can automatically switch loads, which effectively solves the problem that different lands have different resistance to plowing equipment, thereby affecting the plowing 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 evenly mounted on the outer side of the rotating roller, an active drive assembly is mounted on one end of the rotating roller, the active drive assembly is used to drive the rotating roller to rotate, and an auxiliary drive assembly is mounted on the other end of the rotating roller, the auxiliary drive assembly is used to compensate the rotational force of the rotating roller according to the load;

[0006] The auxiliary drive assembly includes a second driving wheel fixedly mounted on one end of a rotating roller, a second driven wheel rotatably mounted on the agricultural machinery vehicle, a second transmission belt is mounted on the outer sides of the second driving wheel and the second driven wheel, a connecting shaft is coaxially mounted on one side of the second driven wheel, a lower friction wheel is mounted on one end of the connecting shaft, an upper friction wheel is arranged above the lower friction wheel, the outer wall of the upper friction wheel is tightly attached to the outer wall of the lower friction wheel, one end of the upper friction wheel is fixedly connected to the output shaft of the auxiliary drive motor, the auxiliary drive motor is fixedly mounted on the agricultural machinery vehicle, and an auxiliary rotation control unit is mounted on the outer side of the connecting shaft.

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

[0008] Preferably, the auxiliary rotation control unit includes a top block arranged above the connecting shaft, side blocks are symmetrically installed at both ends of the top block, the side blocks are fixedly installed on the agricultural machinery vehicle, a front groove is opened at one end of the top block, and mounting plates are symmetrically installed at the bottom end of the top block, a rotating wheel is arranged between the two mounting plates, the rotating shaft of the rotating wheel is rotatably connected to the mounting plate, the bottom wall of the rotating wheel is tightly attached to the top wall of the connecting shaft, a current control unit is installed inside the top block, and a clamping and fixing unit is installed inside the side block.

[0009] Preferably, a lower gear is installed on one end of the rotating shaft of the rotating wheel, and an upper gear is meshed and connected above the lower gear. The upper gear is rotatably installed on the mounting plate, and the upper gear 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, and the upper gear meshes with the teeth.

[0010] Preferably, the current control unit includes a movable groove opened inside the top block, one end of the movable groove penetrates into the interior of the front groove, and the movable groove is coaxially arranged with the rotating ring, and a through hole is opened at the other end of the movable groove at an equal angle, and a piston is movably installed inside the movable groove, and 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 cross bar is fixedly installed on the side of the piston away from the front groove, a longitudinal bar is installed on the end of the cross bar located outside the top block, a sliding rheostat is fixedly installed on the top of the top block, a connecting rod is fixedly installed on 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 arranged in series with the auxiliary drive motor.

[0012] Preferably, a rotating sleeve is installed on the side of the return spring close to the movable groove, the rotating sleeve is located inside the movable groove, and the rotating sleeve is located on the side of the piston away from the front groove, a limiting swivel is fixedly installed on the outer wall of the rotating sleeve, the limiting swivel is rotatably installed inside the limiting ring groove, the limiting ring groove is opened on the inner wall of the movable groove, and 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 on the top of the internal plate, the top of the pull rod passes through the top of the side block, a clamping plate is fixedly installed on the top of the pull rod, and a pressure block is fixedly installed on the top of the connecting rod, and the pressure block is located below the clamping plate.

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

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1) During operation, the rotating roller is driven by the active drive motor, and a second driving wheel is provided at the other end of the rotating roller. The second driving wheel is connected to the second driven wheel through 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 upper friction wheel can be driven to rotate by the auxiliary drive motor. The friction resistance of the upper friction wheel to the lower friction wheel has an auxiliary rotation effect on the rotating roller, which facilitates the auxiliary rotation of the rotating roller under different load conditions and facilitates the use of agricultural machinery vehicles.

[0017] 2) During operation, the rotating wheel at the bottom end of the top block is in close contact with the outer wall of the connecting shaft. When the rotating roller rotates, the connecting shaft is driven to rotate, and then the rotating ring is driven to rotate through the rotating wheel. The fan blades generate air pressure on one side of the piston to adjust the position of the conductive slider on the sliding rheostat. The slower the rotating roller rotates, the smaller the resistance of the sliding rheostat connected to the circuit is, so that the output shaft of the auxiliary drive motor rotates faster, and the auxiliary rotation force of the upper friction wheel on the rotating roller is greater. When the load is greater, the auxiliary rotation effect of the upper friction wheel on the rotating roller is better.

[0018] 3) During operation, after the set piston position is stabilized, the electromagnet is controlled to be energized, and the electromagnet generates an attractive force on the magnetic block. Under the action of the attractive force, the internal plate is driven to move downward, thereby pulling the clamping plate downward. A pressure block is installed on the connecting rod, and the position of the pressure block is clamped and fixed after the clamping plate moves downward, thereby facilitating the fixation of the position of the conductive slider on the sliding rheostat, ensuring that the upper friction wheel has an auxiliary effect on the rotating roller during the plowing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0020] In the attached figure:

[0021] Figure 1 This is a schematic structural diagram of a large agricultural vehicle transmission device capable of automatically switching loads according to the present invention;

[0022] Figure 2 This is a schematic structural diagram of the auxiliary drive assembly 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 structural diagram of a current control unit of the present invention;

[0025] Figure 5 Schematic diagram of the internal structure of the movable tank of the present invention;

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

[0027] Figure 7 It is a structural schematic diagram of the pressing and fixing unit of the present invention.

[0028] In the figure: 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. Connecting groove; 4088, upper gear; 4089, rotating ring; 40810, teeth; 409, current control unit; 4091, movable groove; 4092, through hole; 4093, piston; 4094, cross bar; 4095, longitudinal bar; 4096, sliding rheostat; 4097, connecting rod; 4098, return spring; 4099, limiting ring groove; 40910, rotating sleeve; 40911, limiting rotating ring; 40912, fan blade; 410, clamping and fixing unit; 4101, pressure block; 4102, internal groove; 4103, internal plate; 4104, pull rod; 4105, clamping plate; 4106, clamping spring; 4107, magnetic block; 4108, electromagnet. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work 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, wherein plowing blades 2 are evenly mounted on the outer side of the rotating roller 1, an active drive component 3 is mounted on one end of the rotating roller 1, the active drive component 3 is used to drive the rotating roller 1 to rotate, and an auxiliary drive component 4 is mounted on the other end of the rotating roller 1, the auxiliary drive component 4 is used to compensate for the rotational force of the rotating roller 1 according to the load, the active drive component 3 comprises a first driving wheel 301 fixedly mounted on the end of the rotating roller 1 away from the second driving wheel 401, a first driven wheel 302 is rotatably mounted on the agricultural vehicle, a first transmission belt 303 is mounted on the outer sides of the first driving 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 meshedly connected to the upper side of the lower transmission gear 304, the upper transmission gear 305 is fixedly connected to the output shaft of the active drive motor 306, and the active drive motor 306 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 is rotatably mounted on the agricultural vehicle, a second transmission belt 403 is mounted on the outer side of the second driving wheel 401 and the second driven wheel 402, a connecting shaft 404 is coaxially mounted on one side of the second driven wheel 402, a lower friction wheel 405 is mounted on one end of the connecting shaft 404, an upper friction wheel 406 is arranged above the lower friction wheel 405, the outer wall of the upper friction wheel 406 is in close contact with the outer wall of the lower friction wheel 405, one end of the upper friction wheel 406 is fixedly connected to the output shaft of the auxiliary drive motor 407, the auxiliary drive motor 407 is fixedly mounted on the agricultural vehicle, and an auxiliary The rotation control unit 408 and the active drive motor 306 drive the rotating roller 1, and the other end of the rotating roller 1 is provided with a second driving wheel 401, the second driving wheel 401 is connected to the second driven wheel 402 through a second transmission belt 403, and the second driven wheel 402 is mounted with a lower friction wheel 405, and 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 upper friction wheel 406 can be driven to rotate by the auxiliary drive motor 407, and the friction resistance of the upper friction wheel 406 to the lower friction wheel 405 has an auxiliary rotation effect on the rotating roller 1, which is convenient for the auxiliary rotation of the rotating roller 1 under different load conditions and convenient for the use of agricultural machinery vehicles.

[0032] The auxiliary rotation control unit 408 includes a top block 4081 arranged above the connecting shaft 404, and side blocks 4082 are symmetrically installed at both ends of the top block 4081. The side blocks 4082 are fixedly installed on the agricultural vehicle. A front groove 4083 is opened at one end of the top block 4081, and a mounting plate 4084 is symmetrically installed at the bottom end of the top block 4081. A rotating wheel 4085 is provided between the two mounting plates 4084. The rotating shaft of the rotating wheel 4085 is rotatably connected to the mounting plate 4084. The bottom wall of the rotating wheel 4085 is tightly attached to the top wall of the connecting shaft 404. A current control unit 4085 is installed inside the top block 4081. The control unit 409 is provided with a clamping and fixing unit 410 inside the side block 4082, and a lower gear 4086 is installed at one end of the rotating shaft of the rotating wheel 4085. The upper part of the lower gear 4086 is meshed with an upper gear 4088, and the upper gear 4088 is rotatably installed on the mounting plate 4084. The upper gear 4088 is located inside the connecting groove 4087, and 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, and 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 provided inside the top block 4081. One end of the movable groove 4091 extends into the interior of the front groove 4083. The movable groove 4091 is coaxially arranged with the rotating ring 4089. A through hole 4092 is provided at the other end of the movable groove 4091 at an equal angle. 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 the piston 4093 away from the front groove 4083. A longitudinal rod 4095 is installed on the end of the crossbar 4094 located outside the top block 4081. A sliding rheostat 4096 is fixedly installed on the top of the top block 4081. A connecting rod 4097 is fixedly installed on the top of the longitudinal rod 4095. The connecting rod 4097 is fixedly connected to the conductive sliding piece of the sliding rheostat 4096. The sliding rheostat 4096 is arranged in series with the auxiliary drive motor 407. A rotating sleeve 4091 is installed on the side of the return spring 4098 close to the 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 limited rotating ring 40911 is fixedly installed on the outer wall of the rotating sleeve 40910. The limited rotating 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 end 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 it moves, it drives the connecting shaft 404 to rotate, and then drives the rotating ring 4089 to rotate through the rotating wheel 4085, and generates air pressure on one side of the piston 4093 through the fan blade 40912, so as to adjust 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 of the sliding rheostat 4096 connected to the circuit, so that the output shaft of the auxiliary drive motor 407 rotates faster, and the auxiliary rotation force of the upper friction wheel 406 on the rotating roller 1 is greater, so that when the load is greater, the auxiliary rotation effect of the upper friction wheel 406 on the rotating roller 1 is better.

[0034] The clamping and fixing unit 410 includes an internal groove 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 on the top of the internal plate 4103, the top of the pull rod 4104 passes through the top of the side block 4082, a clamping plate 4105 is fixedly installed on the top of the pull rod 4104, a pressure block 4101 is fixedly installed on the top of the connecting rod 4097, the pressure block 4101 is located below the pressure plate 4105, a compression spring 4106 is symmetrically installed on the bottom end of the internal plate 4103, the bottom end of the compression spring 4106 is fixedly connected to the inner bottom wall of the internal groove 4102, and the internal plate 4103 is fixedly installed on the top end of the connecting rod 4097. 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 position of the piston 4093 is stable, the electromagnet 4108 is controlled to be energized, and the electromagnet 4108 generates an attraction to the magnetic block 4107. Under the action of the attraction, the internal plate 4103 is driven to move downward, thereby pulling the clamping plate 4105 to move downward, and a pressure block 4101 is installed on the connecting rod 4097. After the clamping plate 4105 moves downward, the position of the pressure block 4101 is pressed and fixed, thereby facilitating the fixation of the position of the conductive slider on the sliding rheostat 4096, ensuring that during the plowing process, the upper friction wheel 406 has an auxiliary effect on the rotating roller 1.

[0035] Working principle: When the agricultural machinery vehicle is working, the resistance of the land to the tillage blade 2 is different due to the different hardness of the land at different positions, which makes the load of tillage at different positions different, thereby making the tillage speed of the land at different positions different. When tilling the land, the active drive motor 306 is turned on to rotate the upper transmission gear 305, thereby driving the first driven wheel 302 to rotate through the lower transmission gear 304, and then driving the rotating roller 1 to rotate through the first transmission belt 303 and the first driving wheel 301. When the rotating roller 1 rotates, the tillage blade 2 on the outer surface of the rotating roller 1 is used to till the land;

[0036] When the rotating roller 1 rotates, the second driven wheel 402 is driven to rotate through the second driving wheel 401 and the second transmission belt 403, and then the lower friction wheel 405 is driven to rotate continuously. Since the rotating wheel 4085 at the bottom end of the top block 4081 is in close contact with the connecting shaft 404, when the connecting shaft 404 rotates, the rotating wheel 4085 is driven to rotate, and then the lower gear 4086 is rotated. The upper part of the lower gear 4086 is meshed with the upper gear 4088, and the upper gear 4088 is meshed 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 ring 4089, rotating sleeve 40910 is driven to rotate continuously. When fan blade 40912 drives the outside air toward the inside of movable groove 4091 along with rotating sleeve 40910, pressure is generated on the end of piston 4093. The faster the rotating ring 4089 rotates, the greater the air pressure on the side of piston 4093. After piston 4093 moves, the conductive slider on sliding rheostat 4096 is driven to move via horizontal rod 4094, vertical rod 4095 and connecting rod 4097. The further the conductive slider moves, the greater the resistance of sliding rheostat 4096 connected to the circuit.

[0037] When the rotation speed of the rotating roller 1 is stable, the switch of the auxiliary drive motor 407 is turned on, so that the output shaft of the auxiliary drive motor 407 rotates, and the upper friction wheel 406 rotates. 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 connected to the circuit, which makes the upper friction wheel 406 rotate faster. The slower the rotating roller 1 rotates, the smaller the resistance of the sliding rheostat 4096 connected to the circuit, which makes the upper friction wheel 406 rotate slower. The friction wheel 405 is in close contact with the lower friction wheel 405. When the rotation speed of the upper friction wheel 406 is greater, the friction force of the upper friction wheel 406 generates a greater auxiliary rotation force on the lower friction wheel 405. When the rotation speed of the upper friction wheel 406 is smaller, the friction force of the upper friction wheel 406 generates a smaller auxiliary rotation force on the lower friction wheel 405. When the auxiliary rotation force is generated on the lower friction wheel 405, it plays an auxiliary main driving role on the rotating roller 1, so that when cultivating hard land, it can play a relatively large auxiliary rotation force on the rotating roller 1, which is convenient for automatically adjusting the cultivating effect under different load conditions.

[0038] After the piston 4093 is stabilized, the electromagnet 4108 is controlled to be energized to generate an attraction to the magnetic block 4107. Under the action of the attraction, the internal plate 4103 is driven to move downward, thereby pulling the clamping plate 4105 downward through the pull rod 4104, so that the clamping plate 4105 is pressed against the top wall of the pressure block 4101, thereby pressing and fixing the conductive sliding piece on the sliding rheostat 4096, thereby ensuring that during the plowing process, the auxiliary drive motor 407 provides auxiliary rotational force to the rotating roller 1.

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

[0040] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A large agricultural vehicle transmission device capable of automatically switching loads, comprising an agricultural vehicle and a rotating roller (1) rotatably mounted on the front end of the agricultural vehicle, characterized in that: The outer side of the rotating roller (1) is evenly provided with tillage blades (2); one end of the rotating roller (1) is provided with an active drive component (3), the active drive component (3) is used to drive the rotating roller (1) to rotate; the other end of the rotating roller (1) is provided with an auxiliary drive component (4), the auxiliary drive component (4) is used to compensate the rotational force of the rotating roller (1) according to the load; The auxiliary drive assembly (4) comprises a second driving wheel (401) fixedly mounted on one end of a rotating roller (1); a second driven wheel (402) is rotatably mounted on the agricultural machinery vehicle; a second transmission belt (403) is mounted on the outer sides of the second driving wheel (401) and the second driven wheel (402); a connecting shaft (404) is coaxially mounted on one side of the second driven wheel (402); a lower friction wheel (405) is mounted on one end of the connecting shaft (404); an upper friction wheel (406) is arranged above the lower friction wheel (405); an outer wall of the upper friction wheel (406) is in close contact with an outer wall of the lower friction wheel (405); one end of the upper friction wheel (406) is fixedly connected to an output shaft of an auxiliary drive motor (407); the auxiliary drive motor (407) is fixedly mounted on the agricultural machinery vehicle; and an auxiliary rotation control unit (408) is mounted on the outer side of the connecting shaft (404).

2. The large agricultural vehicle transmission device capable of automatically switching loads according to claim 1 is characterized in that: The active drive assembly (3) comprises a first driving wheel (301) fixedly mounted on an end of a rotating roller (1) away from a second driving wheel (401); a first driven wheel (302) is rotatably mounted on the agricultural machinery vehicle; a first transmission belt (303) is mounted on the outer sides of the first driving 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 meshingly connected above the lower transmission gear (304); the upper transmission gear (305) is fixedly connected to an output shaft of an active drive motor (306); and the active drive motor (306) is mounted on the agricultural machinery vehicle.

3. The large agricultural vehicle transmission device capable of automatically switching loads according to claim 1 is characterized in that: The auxiliary rotation control unit (408) comprises a top block (4081) arranged above the connecting shaft (404), side blocks (4082) are symmetrically installed at both ends of the top block (4081), and the side blocks (4082) are fixedly installed on the agricultural machinery vehicle. A front groove (4083) is opened at one end of the top block (4081), and a mounting plate (4084) is symmetrically installed at the bottom end of the top block (4081). A rotating wheel (4085) is arranged between the two mounting plates (4084), and the rotating shaft of the rotating wheel (4085) is rotatably connected to the mounting plate (4084). The bottom wall of the rotating wheel (4085) is tightly attached to the top wall of the connecting shaft (404), a current control unit (409) is installed inside the top block (4081), and a pressing and fixing unit (410) is installed inside the side block (4082).

4. The large agricultural vehicle transmission device capable of automatically switching loads according to claim 3 is characterized in that: A lower gear (4086) is installed at one end of the rotating shaft of the rotating wheel (4085), and an upper gear (4088) is meshedly connected above the lower gear (4086). The upper gear (4088) is rotatably installed on the mounting plate (4084), and the upper gear (4088) 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 arranged inside the front groove (4083), and teeth (40810) are installed at equal angles on the outer wall of the rotating ring (4089), and the upper gear (4088) meshes with the teeth (40810).

5. The large agricultural vehicle transmission device capable of automatically switching loads according to claim 3 is characterized in that: The current control unit (409) includes a movable groove (4091) opened inside the top block (4081), one end of the movable groove (4091) penetrates into the front groove (4083), and the movable groove (4091) is coaxially arranged with the rotating ring (4089), and the other end of the movable groove (4091) is provided with a through hole (4092) at an equal angle, and a piston (4093) is movably installed inside the movable groove (4091), and a return spring (4098) is installed on the side of the piston (4093) away from the front groove (4083), and 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).

6. The large agricultural vehicle transmission device capable of automatically switching loads according to claim 5 is characterized in that: A cross bar (4094) is fixedly installed on the side of the piston (4093) away from the front groove (4083); a longitudinal bar (4095) is installed on one end of the cross bar (4094) located outside the top block (4081); a sliding rheostat (4096) is fixedly installed on the top of the top block (4081); a connecting rod (4097) is fixedly installed on the top of the longitudinal rod (4095); the connecting rod (4097) is fixedly connected to a conductive sliding sheet of the sliding rheostat (4096); and the sliding rheostat (4096) is arranged in series with the auxiliary drive motor (407).

7. The large agricultural vehicle transmission device capable of automatically switching loads according to claim 5, characterized in that: A rotating sleeve (40910) is installed on the side of the return spring (4098) close to the movable groove (4091), 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 rotating ring (40911) is fixedly installed on the outer wall of the rotating sleeve (40910), the limiting rotating 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), and fan blades (40912) are installed at equal angles on the inner wall of the rotating sleeve (40910).

8. The large agricultural vehicle transmission device capable of automatically switching loads according to claim 3 is characterized in that: The clamping and fixing unit (410) includes an internal groove (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 end of the internal plate (4103), the top end of the pull rod (4104) passes through the top end of the side block (4082), a clamping plate (4105) is fixedly installed at the top end of the pull rod (4104), and a pressure block (4101) is fixedly installed at the top end of the connecting rod (4097), and the pressure block (4101) is located below the clamping plate (4105).

9. The large agricultural vehicle transmission device capable of automatically switching loads according to claim 8, characterized in that: A compression spring (4106) is symmetrically installed at the bottom end of the internal plate (4103), and the bottom end of the compression 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 end of the internal plate (4103), and an electromagnet (4108) is fixedly installed on the inner bottom wall of the internal groove (4102).

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