Gearbox structure for transmission of corn harvester

Abstract

The utility model relates to the technical field of gearboxes, and discloses a gearbox structure for transmission of a corn harvester, which solves the problem that the existing gearbox of the corn harvester is inconvenient to remove impurities and dissipate heat, and comprises a gearbox shell, and a change gear set is rotatably arranged in the gearbox shell. A gearbox oil filtering and cooling mechanism is fixedly arranged on the outer surface of the gearbox shell, and the gearbox oil filtering and cooling mechanism is composed of an oil collecting box, a combined type filtering adsorption plate, an oil pumping pipe, a booster oil pump, an oil supply pipe, a jet cooling assembly, a secondary cooling assembly, an oil storage box, a horizontal partition plate, a plurality of oil supply pipes and a plurality of oil supply branch pipes; by means of the gearbox of the corn harvester, the filtering effect and the heat dissipation effect on gearbox oil can be improved, and then the service life of the gearbox is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to gearbox technical field, concretely is a kind of gearbox structure for corn harvester transmission. BACKGROUND

[0002] Corn harvester is a kind of application more and more extensive emerging agricultural machinery, its appearance greatly improves the efficiency of corn harvesting, reduces the labor intensity of people.Corn harvester gearbox is an important component of corn harvester, gearbox in long-term working process, its internal gear meshing wear will produce more metal scrap, some metal wear debris deposited at the bottom of gearbox can be circulated with machine oil, so it can aggravate the wear rate between gears, shorten the service life of gearbox, maintenance frequency frequently, increase maintenance cost, in addition, when corn harvester works for a long time high load, gearbox internal temperature can be elevated, long time high temperature can also affect the service life of its internal transmission components, therefore, the present application proposes a kind of gearbox structure for corn harvester transmission. SUMMARY

[0003] For the above situation, in order to overcome the defects of prior art, the utility model provides a kind of gearbox structure for corn harvester transmission, effectively solve the problem that current corn harvester gearbox is not convenient to remove impurity and radiate heat.

[0004] To achieve the above object, the utility model provides the following technical scheme: a kind of gearbox structure for corn harvester transmission, including gearbox shell, the inside rotation of the gearbox shell is provided with gear group, the outer surface of gearbox shell is fixedly provided with gearbox oil filtration cooling mechanism, gearbox oil filtration cooling mechanism is by oil collecting box, combined filter adsorption plate, oil extraction pipe, booster oil pump, oil supply pipe, injection cooling assembly, secondary cooling assembly, oil storage box, horizontal baffle, several oil supply pipes and several oil supply branch pipes are constituted, oil collecting box is fixedly connected to the bottom end of gearbox shell and is communicated with gearbox shell, combined filter adsorption plate is connected to the inside of oil collecting box, booster oil pump is fixedly connected to one end of oil collecting box, oil extraction pipe is fixedly connected between oil collecting box and booster oil pump, injection cooling assembly is fixedly connected to the top of one end of gearbox shell, oil supply pipe is fixedly connected between booster oil pump and injection cooling assembly, secondary cooling assembly is fixedly connected to one end of the top of gearbox shell and is connected with injection cooling assembly, oil storage box is fixedly connected to the middle position of the top of gearbox shell and is connected with secondary cooling assembly, horizontal baffle is fixedly connected to the inside of oil storage box, oil supply pipe is connected to horizontal baffle and gearbox shell, oil supply branch pipe is fixedly connected to the bottom end of oil supply pipe and is located directly above gear group.

[0005] Preferably, the gearbox housing bottom is fixedly provided with support seats at both ends, and one end of the gearbox housing is fixedly provided with a gas permeable mesh cover sleeved on the jet cooling assembly and the secondary cooling assembly, and a plurality of heat dissipation fans matched with the secondary cooling assembly are fixedly arranged on one side in the gas permeable mesh cover.

[0006] Preferably, the combined filter and adsorption plate is composed of a combined filter plate and a plurality of adsorption assemblies, the combined filter plate is connected to the oil collecting box, and the adsorption assemblies are fixedly connected to the bottom end of the combined filter plate.

[0007] Preferably, the combined filter plate is composed of two plug-in end plates, a support mesh and a filter core, the two plug-in end plates are fixedly connected to both ends of the support mesh, and the filter core is connected to the top end of the support mesh.

[0008] Preferably, the adsorption assembly is composed of an oil discharge cover, a first magnetic plate and a second magnetic plate, the oil discharge cover is fixedly connected to the bottom end of the support mesh, the first magnetic plate and the second magnetic plate are fixedly connected to both sides in the oil discharge cover respectively, the first magnetic plate is located on the top of the second magnetic plate, the vertical section of the oil discharge cover is a V-shaped structure, the bottom of the oil discharge cover is provided with an oil discharge groove, the bottom of the first magnetic plate and the second magnetic plate is an arc-shaped structure, and the top of the first magnetic plate and the second magnetic plate forms an impurity collecting groove.

[0009] Preferably, the jet cooling assembly is composed of an expansion nozzle, an auxiliary heat dissipation cap and a flow guide pipe, the expansion nozzle is fixedly connected with the oil supply pipe, the auxiliary heat dissipation cap is fixedly connected to the top end of the expansion nozzle, and the flow guide pipe is fixedly connected between the auxiliary heat dissipation cap and the secondary cooling assembly.

[0010] Preferably, the expansion nozzle is composed of a constant pressure and equal diameter nozzle and a booster conical nozzle, and the booster conical nozzle is welded to the top end of the constant pressure and equal diameter nozzle.

[0011] Preferably, the auxiliary heat dissipation cap is composed of an outer ring body, an inner ring body one, an inner ring body two and a flow distribution cone, the inner ring body one and the inner ring body two are fixedly connected to both sides in the inner surface of the outer ring body respectively, the flow distribution cone is fixedly connected to the middle position of the top end of the inner surface of the outer ring body, an installation groove matched with the booster conical nozzle is formed between the inner ring body one and the inner ring body two, two heat dissipation flow channels and two oil collecting grooves are formed between the inner ring body one and the inner ring body two and the outer ring body, an oil inlet communicated with the heat dissipation flow channel is formed at the top end of the installation groove, and the inner diameter of the oil inlet is five times of the minimum inner diameter of the booster conical nozzle.

[0012] Preferably, the secondary cooling assembly is composed of a cooling tank, a heat dissipation assembly and an oil discharge pipe, the heat dissipation assembly is connected to the top end of the cooling tank, the oil discharge pipe is fixedly connected between the cooling tank and the oil storage box, a plurality of first partitions and a plurality of second partitions are fixedly arranged in the cooling tank, the first partitions and the second partitions are alternately connected to the two sides of the cooling tank, and the S-shaped flow channel is formed between the first partitions and the second partitions.

[0013] Preferably, the heat dissipation assembly is composed of a plurality of heat pipes, a heat dissipation plate and a plurality of heat dissipation fins, the heat pipes are inserted into the cooling tank, the heat dissipation plate is fixedly connected to the top end of the heat pipes, the heat dissipation fins are fixedly connected to the top end of the heat dissipation plate, a plurality of heat conduction discs are fixedly arranged at the bottom end of the outer surface of the heat pipes, and a plurality of heat conduction sleeves are fixedly arranged at the bottom end of the heat dissipation plate.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] (1) In the working, the gearbox oil filtering and cooling mechanism composed of the oil collecting box, the combined filter plate, the oil suction pipe, the booster oil pump, the oil supply pipe, the jet cooling assembly, the secondary cooling assembly, the oil storage box, the horizontal partition, the plurality of oil supply pipes and the plurality of oil supply branch pipes can realize the circulation filtering, lubrication and heat dissipation of the gearbox oil, improve the lubrication effect, heat dissipation effect and cleanliness of the gearbox oil, and further improve the service life of the gearbox.

[0016] (2) The combined filter plate composed of the two plug-in end plates, the support screen and the filter core can realize the efficient filtering of the gearbox oil, and the adsorption assembly composed of the oil discharge cover, the first magnetic plate and the second magnetic plate can adsorb the fine metal particles, effectively improving the cleanliness of the gearbox oil.

[0017] (3) The expansion nozzle composed of the constant pressure equal diameter nozzle and the booster conical nozzle can jet the gearbox oil, the gearbox oil changes from high pressure state to low pressure state, so that rapid cooling is realized, and the auxiliary heat dissipation cap composed of the outer ring body, the inner ring body one, the inner ring body two and the flow dividing cone can assist the heat dissipation of the jetted gearbox oil mist, effectively reducing the temperature of the gearbox oil.

[0018] (4) The secondary cooling assembly composed of the cooling tank, the heat dissipation assembly and the oil discharge pipe can further dissipate heat of the gearbox oil, so that the gearbox oil reaches the normal working temperature, thereby realizing the efficient circulation heat dissipation of the gear set, and improving the service life of the gearbox. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the utility model, constitute a part of the specification, and are used together with the embodiments of the utility model to explain the utility model, and do not constitute the limitation to the utility model.

[0020] In the drawings:

[0021] Figure 1 It is schematic view of transmission gearbox structure for corn harvester of the utility model;

[0022] Figure 2 It is schematic view of internal structure of transmission gearbox for corn harvester of the utility model;

[0023] Figure 3 It is schematic view of transmission gearbox oil filtering cooling mechanism structure of the utility model;

[0024] Figure 4 It is schematic view of combined filter adsorption plate structure of the utility model;

[0025] Figure 5 It is the partial enlarged view of the utility model Figure 4 ;

[0026] Figure 6 It is schematic view of jet cooling assembly structure of the utility model;

[0027] Figure 7 It is schematic view of expansion nozzle structure of the utility model;

[0028] Figure 8 It is schematic view of auxiliary heat dissipation cap structure of the utility model;

[0029] Figure 9 It is schematic view of two-stage cooling assembly structure of the utility model;

[0030] Figure 10 It is schematic view of heat dissipation assembly structure of the utility model;

[0031] In the figure: 1, gearbox housing; 2, gear group; 3, gearbox oil filter cooling mechanism; 4, oil collecting box; 5, combined filter adsorption plate; 6, oil pumping pipe; 7, booster oil pump; 8, oil supply pipe; 9, jet cooling assembly; 10, secondary cooling assembly; 11, oil storage box; 12, horizontal partition; 13, oil supply pipe; 14, oil supply branch pipe; 15, support seat; 16, air permeable mesh cover; 17, cooling fan; 18, combined filter plate; 19, adsorption assembly; 20, plug-in end plate; 21, support mesh; 22, filter core; 23, oil discharge cover; 24, first magnetic plate; 25, second magnetic plate; 26, oil discharge groove; 27, impurity collection groove; 28, expansion nozzle; 29, auxiliary cooling cap; 30, flow guide pipe; 31, constant pressure equal diameter nozzle; 32, booster conical nozzle; 33, outer ring body; 34, inner ring body one; 35, inner ring body two; 36, shunt cone; 37, mounting groove; 38, heat dissipation flow channel; 39, oil collecting groove; 40, oil inlet; 41, cooling groove; 42, heat dissipation assembly; 43, oil discharge pipe; 44, first partition; 45, second partition; 46, S-shaped flow channel; 47, heat pipe; 48, heat dissipation plate; 49, heat dissipation fin; 50, heat conduction disc; 51, heat conduction collar. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] Embodiment one, by Figures 1 to 3The utility model gives a kind of gearbox structure for corn harvester transmission, including gearbox shell 1, the inside rotation of gearbox shell 1 is provided with gear shift gear set 2, the outer surface of gearbox shell 1 is fixedly provided with gearbox oil filtration cooling mechanism 3, gearbox oil filtration cooling mechanism 3 is by oil collecting box 4, combined filter adsorption plate 5, oil extraction pipe 6, booster oil pump 7, oil supply pipe 8, injection cooling assembly 9, two-stage cooling assembly 10, oil storage box 11, horizontal baffle 12, several oil supply pipes 13 and several oil supply branch pipes 14 constitute, oil collecting box 4 is fixedly connected to the bottom end of gearbox shell 1 and with gearbox shell 1 intercommunication, combined filter adsorption plate 5 is connected to the inside of oil collecting box 4, booster oil pump 7 is fixedly connected to one end of oil collecting box 4, oil extraction pipe 6 is fixedly connected between oil collecting box 4 and booster oil pump 7, injection cooling assembly 9 is fixedly connected to the top of one end of gearbox shell 1, oil supply pipe 8 is fixedly connected between booster oil pump 7 and injection cooling assembly 9, two-stage cooling assembly 10 is fixedly connected to one end of the top of gearbox shell 1 and with injection cooling assembly 9 is connected, oil storage box 11 is fixedly connected to the intermediate position of the top end of gearbox shell 1 and with two-stage cooling assembly 10 is connected, horizontal baffle 12 is fixedly connected to the inside of oil storage box 11, oil supply pipe 13 is connected to horizontal baffle 12 and gearbox shell 1, and oil supply branch pipe 14 is fixedly connected to the bottom end of oil supply pipe 13 and is located directly above gear shift gear set 2;

[0034] Gearbox working process, gearbox oil enters the inside of oil collecting box 4, realizes the filtration and adsorption of gearbox oil by combined filter adsorption plate 5, the filtered gearbox oil enters booster oil pump 7 by oil extraction pipe 6, then is pressurized by booster oil pump 7, the pressurized gearbox oil enters injection cooling assembly 9 by oil supply pipe 8, realizes first cooling by injection cooling assembly 9, then enters two-stage cooling assembly 10 inside to realize secondary cooling, the cooled gearbox oil enters the inside of oil storage box 11, then is discharged to gear shift gear set 2 by oil supply pipe 13 and oil supply branch pipe 14, realizes the high-efficiency dead-angle-free lubrication of gear shift gear set 2;

[0035] The both ends of the bottom of gearbox shell 1 are fixedly provided with support seat 15, and the one end of gearbox shell 1 is fixedly provided with gas permeable mesh enclosure 16 sleeved in injection cooling assembly 9 and two-stage cooling assembly 10, and a plurality of heat dissipation fans 17 matched with two-stage cooling assembly 10 are fixedly arranged on one side in the gas permeable mesh enclosure 16;

[0036] Gas permeable mesh enclosure 16 can play the role of protection and gas permeation, and heat dissipation fan 17 can realize the auxiliary heat dissipation of two-stage cooling assembly 10.

[0037] In the embodiment two, on the basis of the embodiment one, Figures 3 to 5The combined filter-adsorption plate 5 is composed of a combined filter plate 18 and a plurality of adsorption assemblies 19, the combined filter plate 18 is connected to the oil collecting box 4, and the adsorption assemblies 19 are fixedly connected to the bottom end of the combined filter plate 18;

[0038] The combined filter plate 18 filters the gearbox oil, and the adsorption assemblies 19 adsorb the gearbox oil;

[0039] The combined filter plate 18 is composed of two plug-in end plates 20, a support screen 21 and a filter core 22, the two plug-in end plates 20 are fixedly connected to the two ends of the support screen 21, and the filter core 22 is connected to the top end of the support screen 21;

[0040] The support screen 21 stably supports the filter core 22, the plug-in end plate 20 can be plugged into the oil collecting box 4, and the filter core 22 filters the oil;

[0041] The adsorption assembly 19 is composed of an oil discharge cover 23, a first magnetic plate 24 and a second magnetic plate 25, the oil discharge cover 23 is fixedly connected to the bottom end of the support screen 21, the first magnetic plate 24 and the second magnetic plate 25 are fixedly connected to the two sides inside the oil discharge cover 23, the first magnetic plate 24 is located on the top of the second magnetic plate 25, the vertical section of the oil discharge cover 23 is a V-shaped structure, the bottom of the oil discharge cover 23 is provided with an oil discharge groove 26, the bottom of the first magnetic plate 24 and the second magnetic plate 25 is arc-shaped, and the top of the first magnetic plate 24 and the second magnetic plate 25 forms an impurity collection groove 27;

[0042] The gearbox oil enters the inside of the oil discharge cover 23, and the first magnetic plate 24 and the second magnetic plate 25 sequentially realize the flow guiding and adsorption effects, magnetically attract the metal impurities, avoid the metal impurities from entering the circulation, and the impurity collection groove 27 can improve the trapping effect of the metal impurities.

[0043] In the third embodiment, based on the first embodiment, Figure 3 , Figure 6 , Figure 7 and Figure 8The spray cooling assembly 9 is composed of an expansion nozzle 28, an auxiliary cooling cap 29 and a flow guide pipe 30. The expansion nozzle 28 is fixedly connected with the oil supply pipe 8. The auxiliary cooling cap 29 is fixedly connected to the top end of the expansion nozzle 28. The flow guide pipe 30 is fixedly connected between the auxiliary cooling cap 29 and the secondary cooling assembly 10. The expansion nozzle 28 is composed of a constant-pressure and equal-diameter nozzle 31 and a pressurized conical nozzle 32. The pressurized conical nozzle 32 is welded to the top end of the constant-pressure and equal-diameter nozzle 31. The auxiliary cooling cap 29 is composed of an outer ring body 33, an inner ring body one 34, an inner ring body two 35 and a flow dividing cone 36. The inner ring body one 34 and the inner ring body two 35 are fixedly connected to the two sides inside the outer ring body 33, respectively. The flow dividing cone 36 is fixedly connected to the middle position of the top end of the inner surface of the outer ring body 33. The installation groove 37 matched with the pressurized conical nozzle 32 is formed between the inner ring body one 34 and the inner ring body two 35. Two heat dissipation flow channels 38 and two oil collecting grooves 39 are formed between the inner ring body one 34, the inner ring body two 35 and the outer ring body 33. The top end of the installation groove 37 forms the oil inlet 40 communicated with the heat dissipation flow channel 38. The inner diameter of the oil inlet 40 is five times of the minimum inner diameter of the pressurized conical nozzle 32.

[0044] The gearbox oil is sprayed through the constant-pressure and equal-diameter nozzle 31 and the pressurized conical nozzle 32. The gearbox oil changes from high pressure state to low pressure state and from liquid state to mist state, so as to realize high-efficiency heat dissipation. The sprayed gearbox oil enters the inside of the heat dissipation flow channel 38, so that the gearbox oil can fully contact with the outer ring body 33, the inner ring body one 34 and the inner ring body two 35, thereby further improving the heat dissipation effect.

[0045] In the embodiment four, on the basis of the embodiment one, Figure 3 、 Figure 9 and Figure 10 The secondary cooling assembly 10 is composed of a cooling groove 41, a heat dissipation assembly 42 and an oil discharge pipe 43. The heat dissipation assembly 42 is insertedly connected to the top end of the cooling groove 41. The oil discharge pipe 43 is fixedly connected between the cooling groove 41 and the oil storage box 11. A plurality of first partition plates 44 and a plurality of second partition plates 45 are fixedly arranged inside the cooling groove 41. The first partition plates 44 and the second partition plates 45 are alternately connected to the two sides inside the cooling groove 41. The S-shaped flow channel 46 is formed between the first partition plates 44 and the second partition plates 45.

[0046] The gearbox oil enters the inside of the cooling groove 41 and flows along the S-shaped flow channel 46, so as to prolong the flow path and make the gearbox oil fully contact with the heat dissipation assembly 42, thereby improving the heat dissipation effect.

[0047] The heat dissipation assembly 42 is composed of a plurality of heat pipes 47, a heat dissipation plate 48 and a plurality of heat dissipation fins 49. The heat pipes 47 are inserted into the cooling groove 41, the heat dissipation plate 48 is fixedly connected to the top end of the heat pipes 47, the heat dissipation fins 49 are fixedly connected to the top end of the heat dissipation plate 48, a plurality of heat-conducting discs 50 are fixedly arranged on the bottom end of the outer surface of the heat pipes 47, and a plurality of heat-conducting sleeves 51 are fixedly arranged on the bottom end of the heat dissipation plate 48.

[0048] The heat is efficiently transferred through the heat pipes 47, and is efficiently dissipated through the heat dissipation plate 48 and the heat dissipation fins 49, so that the temperature of the gearbox oil is effectively reduced, and the service life of the gearbox is improved.

[0049] In work, the gearbox oil filtering and cooling mechanism composed of the oil collecting box, the combined filtering and adsorbing plate, the oil pumping pipe, the booster oil pump, the oil supply pipe, the jet cooling assembly, the secondary cooling assembly, the oil storage box, the horizontal partition plate, the plurality of oil supply pipes and the plurality of oil supply branch pipes can realize the circulation filtering, lubrication and heat dissipation of the gearbox oil, improve the lubrication effect, the heat dissipation effect and the cleanliness of the gearbox oil, and further improve the service life of the gearbox. The combined filtering plate composed of the two plug-in end plates, the supporting partition net and the filter core can realize the efficient filtering of the gearbox oil. The adsorbing assembly composed of the oil discharge cover, the first magnetic adsorbing plate and the second magnetic adsorbing plate can adsorb the fine metal particles and effectively improve the cleanliness of the gearbox oil. The expansion nozzle composed of the constant-pressure and equal-diameter nozzle and the booster conical nozzle can jet the gearbox oil, so that the gearbox oil changes from a high-pressure state to a low-pressure state, thereby realizing rapid cooling. The auxiliary heat dissipation cap composed of the outer ring body, the inner ring body one, the inner ring body two and the flow dividing cone can assist in heat dissipation of the jetted gearbox oil mist, effectively reducing the temperature of the gearbox oil. The secondary cooling assembly composed of the cooling groove, the heat dissipation assembly and the oil discharge pipe can further dissipate heat of the gearbox oil, so that the gearbox oil reaches the normal working temperature, thereby realizing the efficient circulation heat dissipation of the variable speed gear set and improving the service life of the gearbox.

Claims

1. A gearbox structure for the transmission of a corn harvester, comprising a gearbox casing (1), characterized in that: The inside of the gearbox shell (1) is provided with a gear shifting gear set (2), and the outer surface of the gearbox shell (1) is fixedly provided with a gearbox oil filtering and cooling mechanism (3), which is composed of an oil collecting box (4), a combined filtering and adsorbing plate (5), an oil pumping pipe (6), a booster oil pump (7), an oil supply pipe (8), a jet cooling assembly (9), a secondary cooling assembly (10), an oil storage box (11), a horizontal partition plate (12), a plurality of oil supply pipes (13) and a plurality of oil supply branch pipes (14). The oil collecting box (4) is fixedly connected to the bottom end of the gearbox shell (1) and communicates with the gearbox shell (1), the combined filtering and adsorbing plate (5) is connected to the inside of the oil collecting box (4), the booster oil pump (7) is fixedly connected to one end of the oil collecting box (4), the oil pumping pipe (6) is fixedly connected between the oil collecting box (4) and the booster oil pump (7), the jet cooling assembly (9) is fixedly connected to the top of one end of the gearbox shell (1), the oil supply pipe (8) is fixedly connected between the booster oil pump (7) and the jet cooling assembly (9), the secondary cooling assembly (10) is fixedly connected to one end of the top of the gearbox shell (1) and connected with the jet cooling assembly (9), the oil storage box (11) is fixedly connected to the middle position of the top end of the gearbox shell (1) and connected with the secondary cooling assembly (10), the horizontal partition plate (12) is fixedly connected to the inside of the oil storage box (11), the oil supply pipe (13) is connected to the horizontal partition plate (12) and the gearbox shell (1), and the oil supply branch pipe (14) is fixedly connected to the bottom end of the oil supply pipe (13) and located directly above the gear shifting gear set (2).

2. A gearbox structure for corn harvester transmission according to claim 1, characterized in that: Both ends of the bottom of the gearbox shell (1) are fixedly provided with support seats (15), and one end of the gearbox shell (1) is fixedly provided with a breathable mesh cover (16) sleeved on the jet cooling assembly (9) and the secondary cooling assembly (10), and a plurality of heat dissipation fans (17) matched with the secondary cooling assembly (10) are fixedly arranged on one side in the breathable mesh cover (16).

3. A gearbox structure for corn harvester transmission according to claim 1, characterized in that: The combined filtering and adsorbing plate (5) is composed of a combined filtering plate (18) and a plurality of adsorbing assemblies (19), the combined filtering plate (18) is connected to the oil collecting box (4), and the adsorbing assembly (19) is fixedly connected to the bottom end of the combined filtering plate (18).

4. A gearbox structure for corn harvester transmission according to claim 3, characterized in that: The combined filtering plate (18) is composed of two plug-in end plates (20), a support partition net (21) and a filter core (22), the two plug-in end plates (20) are fixedly connected to both ends of the support partition net (21), and the filter core (22) is connected to the top end of the support partition net (21).

5. A gearbox structure for corn harvester transmission according to claim 4, characterized in that: The adsorption assembly (19) is composed of an oil discharge cover (23), a first magnetic adsorption plate (24) and a second magnetic adsorption plate (25), the oil discharge cover (23) is fixedly connected to the bottom end of the support screen (21), the first magnetic adsorption plate (24) and the second magnetic adsorption plate (25) are fixedly connected to the two sides inside the oil discharge cover (23) respectively, the first magnetic adsorption plate (24) is located at the top of the second magnetic adsorption plate (25), the vertical section of the oil discharge cover (23) is a V-shaped structure, the bottom of the oil discharge cover (23) is provided with an oil discharge groove (26), the bottom of the first magnetic adsorption plate (24) and the second magnetic adsorption plate (25) is an arc-shaped structure, and the top of the first magnetic adsorption plate (24) and the second magnetic adsorption plate (25) forms an impurity collecting groove (27).

6. A gearbox structure for corn harvester transmission according to claim 1, characterized in that: The jet cooling assembly (9) is composed of an expansion nozzle (28), an auxiliary heat dissipation cap (29) and a flow guide pipe (30), the expansion nozzle (28) is fixedly connected with the oil supply pipe (8), the auxiliary heat dissipation cap (29) is fixedly connected to the top end of the expansion nozzle (28), and the flow guide pipe (30) is fixedly connected between the auxiliary heat dissipation cap (29) and the secondary cooling assembly (10).

7. A gearbox structure for corn harvester transmission according to claim 6, characterized in that: The expansion nozzle (28) is composed of a constant pressure equal diameter nozzle (31) and a pressurizing conical nozzle (32), and the pressurizing conical nozzle (32) is welded to the top end of the constant pressure equal diameter nozzle (31).

8. A gearbox structure for corn harvester transmission according to claim 7, characterized in that: The auxiliary heat dissipation cap (29) is composed of an outer ring body (33), an inner ring body one (34), an inner ring body two (35) and a shunt cone (36), the inner ring body one (34) and the inner ring body two (35) are fixedly connected to the two sides inside the outer ring body (33) respectively, the shunt cone (36) is fixedly connected to the middle position of the top end of the inner surface of the outer ring body (33), an installation groove (37) matched with the pressurizing conical nozzle (32) is formed between the inner ring body one (34) and the inner ring body two (35), two heat dissipation flow channels (38) and two oil collecting grooves (39) are formed between the inner ring body one (34), the inner ring body two (35) and the outer ring body (33), a oil inlet (40) in communication with the heat dissipation flow channel (38) is formed at the top end of the installation groove (37), and the inner diameter of the oil inlet (40) is five times of the minimum inner diameter of the pressurizing conical nozzle (32).

9. A gearbox structure for corn harvester transmission according to claim 1, characterized in that: The secondary cooling assembly (10) is composed of a cooling groove (41), a heat dissipation assembly (42) and an oil discharge pipe (43), the heat dissipation assembly (42) is insertedly connected to the top end of the cooling groove (41), the oil discharge pipe (43) is fixedly connected between the cooling groove (41) and the oil storage box (11), a plurality of first baffles (44) and a plurality of second baffles (45) are fixedly arranged in the cooling groove (41), the first baffles (44) and the second baffles (45) are alternately connected to the two sides inside the cooling groove (41), and an S-shaped flow channel (46) is formed between the first baffles (44) and the second baffles (45).

10. A gearbox structure for corn harvester transmission according to claim 9, characterized in that: The heat dissipation assembly (42) is composed of several heat pipes (47), a heat dissipation plate (48) and several heat dissipation fins (49), the heat pipes (47) are inserted into the cooling groove (41), the heat dissipation plate (48) is fixedly connected to the top end of the heat pipes (47), the heat dissipation fins (49) are fixedly connected to the top end of the heat dissipation plate (48), the bottom end of the outer surface of the heat pipe (47) is fixedly provided with several heat conduction discs (50), and the bottom end of the heat dissipation plate (48) is fixedly provided with several heat conduction sleeves (51) sleeved on the heat pipes (47).

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