A double fork double tandem gearbox system for a harvester

Abstract

The application discloses a double-shifting double-connection type gear box system for a harvester, which comprises a gear box body, an oil mist treatment device and a fan, and the gear box body contains lubricating oil; the fan comprises a volute, an impeller, a motor and an outer cylinder cover, the outer cylinder cover is connected to the upper end surface of the volute, and a first filter hole is formed in the top of the outer circumferential wall of the outer cylinder cover; the impeller comprises an upper cover disc, a lower cover disc, blades and a connecting disc; the adjusting assembly comprises an adjusting shaft, an adjusting disc, an adjusting seat, a mounting portion and blade grooves, the lower end of the adjusting shaft is connected with the adjusting seat, the outer circumferential edge of the adjusting seat is connected with the adjusting disc, a plurality of blade grooves are formed in the adjusting disc, the adjusting disc can move along the axial direction relative to the blades through the blade grooves, the rotating shaft is a hollow shaft, the adjusting shaft penetrates into the hollow shaft and the upper end of the adjusting shaft extends to the outside of the top cover. The volume of the upper impeller cavity and the lower impeller cavity can be adjusted, so that the mixing ratio of cold air and hot oil mist can be adjusted, and the oil mist recovery efficiency can be improved under multiple working conditions.

Description

Technical Field

[0001] This invention relates to the technical field of double-fork double-gearbox systems, and more specifically to a double-fork double-gearbox system for harvesters. Background Technology

[0002] The existing gearbox system's lubricating oil mist treatment device includes a double-fork double-link gearbox housing, a primary oil mist treatment device, a centrifugal fan, a secondary oil mist treatment device, and a control system. The housing contains lubricating oil. The upper end of the housing is connected to the primary oil mist treatment device via an air inlet pipe. The upper end of the primary oil mist treatment device is connected to the fan. The fan's outlet pipe is connected to the secondary oil mist treatment device via an intermediate connecting pipe. The lower end of the primary oil mist treatment device is connected to the housing via a first return pipe. The lower end of the secondary oil mist treatment device is connected to the housing via a second return pipe.

[0003] The prior art CN118454363A discloses an oil mist recovery device for external leakage of natural gas compressor. The upper part of the outer cylinder has several air inlets. Outside air flows in through the air inlets and exchanges heat with the oil mist, which can further improve the oil mist recovery efficiency.

[0004] However, existing oil mist treatment and recovery devices suffer from several drawbacks. The heat exchange airflow is passively generated, resulting in poor controllability of both the airflow and oil mist recovery efficiency. Furthermore, the volume of the upper and lower impeller chambers cannot be adjusted based on the airflow and cooling temperature, leading to poor oil mist recovery efficiency under various operating conditions. Additionally, the volume of the upper and lower impeller chambers is inconvenient to adjust, further hindering the improvement of oil mist recovery efficiency. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a double-fork, double-gearbox system for harvesters. Through improved fan structure design, under the rotation of the impeller, outside air flows in through the first filter and exchanges heat with oil mist. At the secondary oil mist treatment device and / or intermediate connecting pipe, the oil mist recovery efficiency can be further improved. The flow rate of the heat exchange airflow is directly controlled by the impeller or motor speed, making it an active flow control type with good controllability of both flow rate and oil mist recovery efficiency. Based on the required flow rate and cooling temperature, this invention adjusts the volume of the upper and lower impeller chambers by rotating or linearly moving the adjusting shaft, thereby adjusting the mixing ratio or relative mixing amount of cold air and hot oil mist. This improves oil mist recovery efficiency under various operating conditions. Adjustment is possible from the outside of the top cover on the motor, making operation convenient and requiring no disassembly of any parts of the fan or the primary oil mist treatment device.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A double-fork, double-gearbox system for a harvester includes a gearbox housing, a primary oil mist treatment device, a fan, a secondary oil mist treatment device, and a control system. The housing contains lubricating oil. The upper surface of the housing is connected to the primary oil mist treatment device via an air inlet pipe. The upper surface of the primary oil mist treatment device is connected to the fan. The fan's outlet pipe is connected to the secondary oil mist treatment device via an intermediate connecting pipe. The lower surface of the primary oil mist treatment device is connected to the housing via a first return pipe, and the lower surface of the secondary oil mist treatment device is connected to the housing via a second return pipe. The fan comprises a volute, an impeller, a motor, and an outer casing. The impeller is rotatably mounted inside the volute and on the rotating shaft of the motor. The upper surface of the volute is connected to the outer casing. The volute has an upper inlet hole and a lower inlet hole at its upper and lower ends, respectively. The top of the outer casing's outer peripheral wall is... The device features an array of first filter holes, with the upper inlet hole communicating with both the first filter holes and the inner cavity of the volute. The impeller includes an upper cover plate, a lower cover plate, blades, and a connecting plate. Multiple blades are evenly distributed circumferentially and connected between the upper and lower cover plates. A connecting plate is connected to the lower end of the rotating shaft, with its radial inner and outer sides connected to the rotating shaft and blades, respectively. The adjustment assembly includes an adjustment shaft, an adjustment plate, an adjustment seat, a mounting part, and blade slots. The lower end of the adjustment shaft is connected to the adjustment seat, and the outer periphery of the adjustment seat is connected to the adjustment plate. Multiple blade slots are provided on the adjustment plate, with each slot corresponding to a blade. The adjustment plate can move axially relative to the blades through the blade slots. The upper end of the adjustment shaft is connected to the mounting part, which is connected to the top cover of the outer cylinder. The rotating shaft is a hollow shaft, with the adjustment shaft passing through it and its upper end extending to the outside of the top cover.

[0008] Furthermore, an upper impeller cavity is formed between the upper cover plate and the adjusting plate, and a lower impeller cavity is formed between the lower cover plate and the adjusting plate; the adjusting plate is moved axially by rotating or linearly moving the adjusting shaft to adjust the volume of the upper and lower impeller cavities, thereby adjusting the mixing ratio of cold air and hot oil mist; the adjusting shaft can be adjusted from the outside of the top cover at the top of the motor.

[0009] Furthermore, the mounting part is a bearing assembly, the adjusting seat is a nut, and the adjusting shaft is a screw. The bearing assembly allows the adjusting shaft to rotate relative to the top cover.

[0010] Furthermore, the mounting part is a limit rotation assembly, the adjusting seat is a fixed plate, the adjusting shaft is an optical shaft, and the outer circumferential surface of the upper end of the adjusting shaft is provided with multiple annular limit grooves distributed along the axial direction. The mounting part is provided with a limit hole, and a spring is installed in the limit hole. The other end of the spring is connected to a ball / roller, and the ball / roller is embedded in the annular limit groove, so that the adjusting shaft can move up and down and rotate relative to the mounting part.

[0011] Furthermore, the connecting plate has multiple connecting holes, which connect the upper and lower sides of the connecting plate respectively, so that the airflow between the connecting plate and the regulating plate can flow back upward through the connecting holes.

[0012] Furthermore, a limit ring is provided at the bottom end of the adjusting shaft, which is used to limit the axial movement of the adjusting seat.

[0013] Furthermore, an easily removable cover is installed on the upper end of the top cover, which is used to cover the top of the adjusting shaft and the mounting part.

[0014] Furthermore, the cross-sectional shape of the blade groove matches the cross-sectional shape of the blade.

[0015] Furthermore, in the first adjustment state, the upper side of the adjustment disc is in contact with the connecting disc; in the second adjustment state, there is an axial gap of more than 1 mm between the upper side of the adjustment disc and the connecting disc.

[0016] Furthermore, a second filter screen is installed inside the outer casing. The upper end of the second filter screen is connected to the lower end face of the motor, and the lower end is connected to the upper end face of the volute. The second filter screen is conical. The primary oil mist treatment device includes a cylinder, a first filter screen, an adsorption filter screen, and a connecting pipe. The upper end of the cylinder is connected to the connecting pipe, and the upper end of the connecting pipe is connected to the lower inlet hole of the volute. The cylinder contains the first filter screen and the adsorption filter screen. The first filter screen is conical, and the adsorption filter screen is located above the first filter screen. The secondary oil mist treatment device has the same structure as the primary oil mist treatment device, including a second cylinder, which also contains the first filter screen and the adsorption filter screen.

[0017] This invention discloses a double-fork, double-gearbox system for a harvester. Through an improved design of the fan structure, the heat exchange airflow path, driven by the impeller rotation, is as follows: first filter holes → motor outer surface → upper inlet hole → blades → volute outlet pipe → intermediate connecting pipe → secondary oil mist treatment device. Under the impeller rotation, outside air flows in through the first filter holes and exchanges heat with the oil mist (the mixing of cold and hot air cools the hot oil mist). At the secondary oil mist treatment device and / or the intermediate connecting pipe, the oil mist recovery efficiency can be further improved. The flow rate of the heat exchange airflow is directly controlled by the impeller or motor speed, making it an active flow control type with good controllability of both flow rate and oil mist recovery efficiency. A top cover is provided at the top of the outer casing, and an array of first filter holes is opened at the top of the outer peripheral wall of the outer casing, preventing external dust and impurities from directly falling into the outer casing, while allowing outside air to dissipate heat from the motor.

[0018] This invention discloses a double-fork, double-gearbox system for harvesters. Through an improved design of the fan structure, the system adjusts the volume of the upper and lower impeller chambers by rotating or linearly moving the adjusting shaft, based on the required flow rate of the heat exchange airflow and the cooling temperature. This adjusts the mixing ratio or relative mixing amount of cold air and hot oil mist, thereby improving the oil mist recovery efficiency under various operating conditions. The system can be adjusted from the outside of the top cover on the upper part of the motor, making it easy to operate without disassembling any parts of the fan or the primary oil mist treatment device. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the principle of the double-fork double-gearbox system for harvesters used in the present invention / prior art;

[0020] Figure 2 This is a schematic diagram of the first-stage oil mist treatment device and the fan in the first state of the double-fork double-gearbox system for harvesters of the present invention.

[0021] Figure 3 This is a schematic diagram of the first-stage oil mist treatment device and the fan in the second state of the double-fork double-gearbox system for harvesters of the present invention.

[0022] Figure 4 This is a schematic diagram of the adjusting disc structure of the double-fork double-gearbox system for harvesters according to the present invention;

[0023] Figure 5 This is a schematic diagram of the fan structure of the double-fork double-gearbox system for harvesters according to the present invention.

[0024] In the diagram: 10 fork double-gearbox housing, 20 primary oil mist treatment device, 30 centrifugal fan, 60 secondary oil mist treatment device; 21 cylinder, 22 inlet pipe, 23 first return pipe, 24 first filter screen, 25 adsorption filter screen, 26 connecting pipe, 31 volute, 32 impeller, 33 motor, 34 rotating shaft, 35 outer cylinder cover, 351 top cover, 352 cover, 36 first filter hole, 37 second filter screen, 38 lower inlet hole, 39 upper inlet hole, 40 upper cover plate, 41 lower cover plate, blade, 42 connecting plate, 43 outlet pipe, 50 adjusting shaft, 51 adjusting plate, 52 adjusting seat, 53 limiting ring, 54 mounting part, 55 blade groove, 56 connecting hole, 61 second return pipe, 62 intermediate connecting pipe, fluid flow direction "→". Detailed Implementation

[0025] To make the technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of the present invention, and are only used to explain the present invention, not to limit the present invention. It should be noted that, for ease of description, only the parts / structures related to the present invention are shown in the accompanying drawings. Other related parts can be referred to with ordinary design. In the absence of conflict, the embodiments and technical features in the embodiments of the present invention can be combined with each other to obtain new embodiments.

[0026] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. Furthermore, unless otherwise defined, the technical or scientific terms used in the description of this invention should have the ordinary meaning understood by those skilled in the art.

[0027] The present invention will now be described in further detail with reference to the accompanying drawings.

[0028] like Figure 1 As shown, a double-fork double-gearbox system for a harvester includes a double-fork double-gearbox housing 10, a primary oil mist treatment device 20, a centrifugal fan 30, a secondary oil mist treatment device 60, and a control system. The housing 10 contains lubricating oil. The upper end of the housing 10 is connected to the primary oil mist treatment device 20 through an air inlet pipe 22. The upper end of the primary oil mist treatment device 20 is connected to the centrifugal fan 30. The outlet pipe 44 of the centrifugal fan 30 is connected to the secondary oil mist treatment device 60 through an intermediate connecting pipe 62. The lower end of the primary oil mist treatment device 20 is connected to the housing 10 through a first return pipe 23. The lower end of the secondary oil mist treatment device 60 is connected to the housing 10 through a second return pipe 61. The oil mist inside the double-fork double-gearbox housing 10 enters the primary oil mist treatment device 20 through the air inlet pipe 22 for primary oil filtration and recovery treatment. The oil mist after primary treatment enters the secondary oil mist treatment device 60 through the fan 30 and the intermediate connecting pipe 62 for secondary oil filtration and recovery treatment. After multi-stage oil filtration and recovery treatment, the exhaust air is basically free of oil, achieving efficient oil mist recovery, avoiding oil pollution of equipment and site, and reducing environmental pollution.

[0029] like Figure 1-5 As shown, the arrow "→" indicates the direction of fluid flow.

[0030] like Figure 2-5As shown, the centrifugal fan 30 includes a volute 31, an impeller 32, a motor 33, and an outer casing 35. The impeller 32 is rotatably mounted inside the volute 31 and on the rotating shaft 34 of the motor 33. The rotating shaft 34 is vertically arranged. The upper end face of the volute 31 is connected to the outer casing 35. The motor 33 is installed inside the outer casing 35, and its upper end is connected to the top cover 351 of the outer casing 35. The upper and lower ends of the volute 31 are respectively provided with an upper inlet hole 39 and a lower inlet hole 38. The lower inlet hole 38 is connected to the inner cavity of the primary oil mist treatment device 20 and the inner cavity of the volute 31. The top of the outer peripheral wall of the outer casing 35 is provided with an array of first filter holes 36. The upper inlet hole 39 is connected to the array of first filter holes 36 and the inner cavity of the volute 31.

[0031] Under the rotation of impeller 32, the heat exchange airflow path is: first filter hole 36 → outer surface of motor 33 → upper inlet hole 39 → inner cavity of volute 31 → outlet pipe 44 of volute 31 → intermediate connecting pipe 62 → secondary oil mist treatment device 60. Under the rotation of impeller 32, outside air flows in through the first filter hole 36 and exchanges heat with the oil mist (the mixing of cold and hot airflows cools the hot oil mist). At the secondary oil mist treatment device 60 and / or intermediate connecting pipe 62, the oil mist recovery efficiency can be further improved. The flow rate of the heat exchange airflow is directly controlled by the rotation speed of impeller 32 or motor 33, which is an active flow control type, with good controllability of heat exchange airflow and oil mist recovery efficiency. The top of the outer cylinder cover 35 is provided with a top cover 351, and the top of the outer peripheral wall of the outer cylinder cover 35 is provided with an array of first filter holes 36, so that external dust and impurities will not fall directly into the outer cylinder cover 35, while the outside air can dissipate heat from the motor.

[0032] Optionally, the array-type first filter holes 36 can also be set in the middle or bottom of the outer peripheral wall of the outer casing 35, thereby reducing the heat dissipation effect on the motor or not dissipating heat from the motor.

[0033] A second filter screen 37 is provided inside the outer cylinder cover 35. The upper end of the second filter screen 37 is connected to the lower end face of the motor 33, and the lower end is connected to the upper end face of the volute 31. The second filter screen 37 is conical.

[0034] The primary oil mist treatment device 20 includes a cylinder 21, a first filter screen 24, an adsorption filter screen 25, and a connecting pipe 26. The upper end of the cylinder 21 is connected to the connecting pipe 26, and the upper end of the connecting pipe 26 is connected to the lower inlet hole 38 of the volute 31. The cylinder 21 is equipped with the first filter screen 24 and the adsorption filter screen 25. The first filter screen 24 is conical, and the adsorption filter screen 25 is located above the first filter screen 24.

[0035] The secondary oil mist treatment device 60 has the same structure as the primary oil mist treatment device 20, including a second cylinder, and a first filter and an adsorption filter are also provided inside the second cylinder.

[0036] Optionally, a third return pipe is connected to the intermediate connecting pipe 62, and the third return pipe is connected to the middle or bottom of the cylinder 21. A control valve is provided on the third return pipe.

[0037] Furthermore, the impeller 32 (rotating component) includes an upper cover plate 40, a lower cover plate 41, blades 42, and a connecting plate 43. Multiple blades 42 are evenly distributed circumferentially and connected between the upper cover plate 40 and the lower cover plate 41. The lower end of the rotating shaft 34 is connected to the connecting plate 43. The radial inner side and outer side of the connecting plate 43 are fixedly connected to the rotating shaft 34 and the blades 42, respectively. The volute 31 has an integrally formed outlet pipe 44.

[0038] Under the rotation of impeller 32, the heat exchange airflow path is: first filter hole 36 → outer surface of motor 33 → upper inlet hole 39 → blade 42 → outlet pipe 44 of volute 31 → intermediate connecting pipe 62 → secondary oil mist treatment device 60.

[0039] In one embodiment, such as Figure 2-5 As shown, it also includes an adjustment assembly, which includes an adjustment shaft 50, an adjustment disc 51, an adjustment seat 52, a limiting ring 53, a mounting part 54, and blade grooves 55. The lower end of the adjustment shaft 50 is connected to the adjustment seat 52, and the outer periphery of the adjustment seat 52 is connected to the adjustment disc 51. The adjustment disc 51 has multiple blade grooves 55, which correspond one-to-one with the blades 42. The adjustment disc 51 can move axially relative to the blades 42 through the blade grooves 55. The upper end of the adjustment shaft 50 is connected to the mounting part 54, which is connected to the top cover 351 of the outer cylinder cover 35. The rotating shaft 34 of the motor 33 is a hollow shaft, and the adjustment shaft 50 passes through the hollow shaft and its upper end extends to the outside of the top cover 351. An upper impeller cavity is formed between the upper cover disc 40 and the adjustment disc 51, and a lower impeller cavity is formed between the lower cover disc 41 and the adjustment disc 51.

[0040] The adjustment disc 51 can be moved axially by adjusting the rotation or linear movement of the adjustment shaft 50 to adjust the volume of the upper and lower impeller chambers, thereby adjusting the mixing ratio or relative mixing amount of cold air and hot oil mist, thus improving the oil mist recovery efficiency under multiple working conditions. It can be adjusted from the outside of the top cover 351 at the top of the motor 33, making it easy to operate without disassembling any parts of the fan 30 or the primary oil mist treatment device 20.

[0041] In one embodiment, the mounting part 54 is a bearing assembly, the adjusting seat 52 is a nut, and the adjusting shaft 50 is a screw. The bearing assembly allows the adjusting shaft 50 to rotate relative to the top cover 351. (Using a tool) the adjusting shaft 50 is rotated from the top of the adjusting shaft 50, and the adjusting seat 52 can move axially relative to the adjusting shaft 50. The corresponding adjusting disc 51 moves axially to adjust the volume of the upper impeller cavity and the lower impeller cavity, thereby adjusting the mixing ratio or relative mixing amount of cold air and hot oil mist.

[0042] In one embodiment, the mounting part 54 is a limiting rotation assembly, the adjusting seat 52 is a fixed disk, and the adjusting shaft 50 is a smooth shaft (non-threaded shaft). The outer circumferential surface of the upper end of the adjusting shaft 50 is provided with multiple axially distributed annular limiting grooves. The mounting part 54 is provided with limiting holes, and a spring is installed in the limiting holes. The other end of the spring is connected to a ball / roller. The ball / roller is partially embedded in the annular limiting groove, so that the adjusting shaft 50 can move up and down and rotate relative to the mounting part 54 (overcoming the pressure of the spring can make the ball / roller engage in different annular limiting grooves in the axial direction, and the adjusting shaft 50 can rotate relative to the mounting part 54 through the annular limiting groove); (using a tool) the adjusting shaft 50 is moved axially from the top end of the adjusting shaft 50, the adjusting seat 52 moves axially, and the corresponding adjusting disk 51 also moves axially to adjust the volume of the upper impeller cavity and the lower impeller cavity, thereby adjusting the mixing ratio or relative mixing amount of cold air and hot oil mist.

[0043] Depending on the required flow rate of the heat exchange airflow and the cooling temperature, the adjusting disc 51 can be moved axially by rotating or linearly moving the adjusting shaft 50 to adjust the volume of the upper and lower impeller chambers, thereby adjusting the mixing ratio or relative mixing amount of cold air and hot oil mist. This can improve the oil mist recovery efficiency under multiple operating conditions. The adjustment can be made from the outside of the top cover 351 at the top of the motor 33, making the operation convenient and requiring no disassembly of any parts of the fan 30 or the primary oil mist treatment device 20.

[0044] Furthermore, the connecting plate 43 is provided with a plurality of connecting holes 56, which connect the upper and lower sides of the connecting plate 43 respectively, so that the airflow between the connecting plate 43 and the regulating plate 51 can flow back upward through the connecting holes 56.

[0045] A limit ring 53 is provided at the bottom end of the adjusting shaft 50, which is used to limit the axial movement of the adjusting seat 52.

[0046] The top cover 351 is equipped with a cover 352 that is easy to remove. The cover 352 is used to cover the top of the adjusting shaft 50 and the mounting part 54.

[0047] The cross-sectional shape of the blade groove 55 matches the cross-sectional shape of the blade 42.

[0048] In one embodiment, in the first adjustment state, the upper side of the adjustment disk 51 is attached to the connecting disk 43; in the second adjustment state, there is an axial gap of more than 2 mm between the upper side of the adjustment disk 51 and the connecting disk 43.

[0049] This invention discloses a double-fork, double-gearbox system for a harvester. Through an improved design of the fan structure, the heat exchange airflow path, driven by the rotation of the impeller 32, is as follows: first filter hole 36 → outer surface of motor 33 → upper inlet hole 39 → blades 42 → outlet pipe 44 of volute 31 → intermediate connecting pipe 62 → secondary oil mist treatment device 60. Under the rotation of the impeller 32, outside air flows in through the first filter hole 36 and exchanges heat with the oil mist (the mixing of cold and hot airflows cools the hot oil mist). At the secondary oil mist treatment device 60 and / or the intermediate connecting pipe 62, the oil mist recovery efficiency can be further improved. The flow rate of the heat exchange airflow is directly controlled by the rotational speed of the impeller 32 or motor 33, making it an active flow control type with good controllability of both the flow rate and the oil mist recovery efficiency. The top of the outer casing 35 is provided with a top cover 351, and the top of the outer peripheral wall of the outer casing 35 is provided with an array of first filter holes 36, so that external dust and impurities will not fall directly into the outer casing 35, while the outside air can dissipate heat from the motor.

[0050] The present invention discloses a double-fork double-gearbox system for a harvester. Through an improved design of the fan structure, the system adjusts the volume of the upper and lower impeller chambers by rotating or linearly moving the adjusting shaft 50 according to the required flow rate of the heat exchange air and the cooling temperature. This adjusts the mixing ratio or relative mixing amount of cold air and hot oil mist, thereby improving the oil mist recovery efficiency under various operating conditions. The system can be adjusted from the outside of the top cover 351 on the upper end of the motor 33, making it easy to operate without disassembling any parts of the fan 30 or the primary oil mist treatment device 20.

[0051] The above embodiments are illustrative of the present invention and not intended to limit the invention. It is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-fork double-gearbox system for a harvester, comprising a gearbox housing, a primary oil mist treatment device, a fan, a secondary oil mist treatment device, and a control system. The housing contains lubricating oil. The upper end of the housing is connected to the primary oil mist treatment device via an air inlet pipe. The upper end of the primary oil mist treatment device is connected to the fan. The outlet pipe of the fan is connected to the secondary oil mist treatment device via an intermediate connecting pipe. The lower end of the primary oil mist treatment device is connected to the housing via a first return pipe. The lower end of the secondary oil mist treatment device is connected to the housing via a second return pipe. Its features are: The fan includes a volute, an impeller, a motor, and an outer casing. The impeller is rotatably mounted inside the volute and on the rotating shaft of the motor. The outer casing is connected to the upper end face of the volute. The upper and lower ends of the volute are respectively provided with an upper inlet hole and a lower inlet hole. The top of the outer peripheral wall of the outer casing is provided with an array of first filter holes (36). The upper inlet hole is connected to the first filter holes and the inner cavity of the volute. The impeller includes an upper cover plate, a lower cover plate, blades, and a connecting plate. Multiple blades are evenly distributed circumferentially and connected between the upper cover plate and the lower cover plate. The lower end of the rotating shaft is connected to the connecting plate. The radial inner and outer sides of the connecting plate are respectively connected to the upper cover plate and the lower cover plate. The rotating shaft and blades are connected; the adjustment assembly includes an adjustment shaft (50), an adjustment plate (51), an adjustment seat (52), a mounting part (54), and a blade groove (55). The lower end of the adjustment shaft is connected to the adjustment seat, and the outer periphery of the adjustment seat is connected to the adjustment plate. Multiple blade grooves are provided on the adjustment plate, and the multiple blade grooves are set one-to-one with the blades. The adjustment plate can move axially relative to the blades through the blade grooves. The upper end of the adjustment shaft is connected to the mounting part, and the mounting part is connected to the top cover (351) of the outer cylinder cover. The rotating shaft is a hollow shaft, and the adjustment shaft passes through the hollow shaft and its upper end extends to the outside of the top cover.

2. The double-fork double-gearbox system for a harvester as described in claim 1, characterized in that, The upper impeller cavity is formed between the upper cover plate and the adjusting plate, and the lower impeller cavity is formed between the lower cover plate and the adjusting plate. The adjusting plate moves axially by rotating or linearly moving the adjusting shaft, thereby adjusting the volume of the upper and lower impeller cavities and thus adjusting the mixing ratio of cold air and hot oil mist. The adjusting shaft can be adjusted from the outside of the top cover at the top of the motor.

3. A double-fork, double-gearbox system for a harvester as described in claim 2, characterized in that, The mounting section is a bearing assembly, the adjusting seat is a nut, and the adjusting shaft is a screw. The bearing assembly allows the adjusting shaft to rotate relative to the top cover.

4. A double-fork, double-gearbox system for a harvester as described in claim 2, characterized in that, The mounting part is a limit rotation assembly, the adjusting seat is a fixed plate, the adjusting shaft is a smooth shaft, and the outer circumferential surface of the upper end of the adjusting shaft is provided with multiple annular limit grooves distributed along the axial direction. The mounting part is provided with limit holes, and a spring is installed in the limit holes. The other end of the spring is connected to a ball / roller, and the ball / roller is embedded in the annular limit groove, so that the adjusting shaft can move up and down and rotate relative to the mounting part.

5. A double-fork, double-gearbox system for a harvester as described in claim 2, characterized in that, The connecting plate has multiple connecting holes (56), which connect the upper and lower sides of the connecting plate respectively, so that the airflow between the connecting plate and the regulating plate can flow back upward through the connecting holes.

6. A double-fork, double-gearbox system for a harvester as described in claim 3, characterized in that, A limit ring (53) is provided at the bottom of the adjusting shaft. The limit ring is used to limit the axial movement of the adjusting seat.

7. A double-fork, double-gearbox system for a harvester as described in claim 3, characterized in that, The top of the top cover is equipped with a removable cover, which is used to cover the top of the adjusting shaft and the mounting part.

8. A double-fork, double-gearbox system for a harvester as described in claim 2, characterized in that, The cross-sectional shape of the blade groove matches the cross-sectional shape of the blade.

9. A double-fork, double-gearbox system for a harvester as described in claim 2, characterized in that, In the first adjustment state, the upper side of the adjustment disc is in contact with the connecting disc; in the second adjustment state, there is an axial gap of more than 1 mm between the upper side of the adjustment disc and the connecting disc.

10. A double-fork, double-gearbox system for a harvester as described in claim 1, characterized in that, A second filter screen is installed inside the outer cylinder cover. The upper end of the second filter screen is connected to the lower end face of the motor, and the lower end is connected to the upper end face of the volute. The second filter screen is conical. The primary oil mist treatment device includes a cylinder, a first filter screen, an adsorption filter screen, and a connecting pipe. The upper end of the cylinder is connected to the connecting pipe, and the upper end of the connecting pipe is connected to the lower inlet hole of the volute. The first filter screen and the adsorption filter screen are installed inside the cylinder. The first filter screen is conical, and the adsorption filter screen is located above the first filter screen. The secondary oil mist treatment device has the same structure as the primary oil mist treatment device. It includes a second cylinder, and the first filter screen and the adsorption filter screen are also installed inside the second cylinder.

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