Low-vibration split type threshing cylinder speed change gear box

Abstract

The invention relates to the technical field of speed change gear boxes, and discloses a low-vibration split type threshing cylinder speed change gear box which solves the problem that at present, gear meshing is repeatedly adjusted, so that gear abrasion is extremely likely to be caused, the low-vibration split type threshing cylinder speed change gear box comprises a speed change gear box body, and a box cover is hinged to the top of the speed change gear box body; a speed change adjusting mechanism and a dustproof mechanism are arranged on the speed change gear box body, a transmission shaft is arranged on the outer side of the speed change gear box body, a connecting mechanism is arranged between the transmission shaft and the speed change gear box body, and the speed change gear box body comprises an output shaft rotationally connected into the speed change gear box body. One end of the output shaft extends to the outer side of the speed change gear box body, two middle shafts are symmetrically and rotationally connected into the speed change gear box body, and a middle small gear and a middle large gear are fixedly installed on the outer sides of the two middle shafts correspondingly; according to the invention, speed change of the output shaft can be realized, so that gear engagement does not need to be repeatedly adjusted, and gear wear is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of speed change gear boxes, and in particular relates to a low-vibration split threshing drum speed change gear box. Background Art

[0002] A variable speed gearbox, also known as a gearbox, is a device used in mechanical equipment to change the output speed, output torque or transmission direction. In threshing machinery, the main function of the variable speed gearbox is to adjust the speed of the threshing drum to meet the threshing needs of different crops, different humidity and different maturity conditions. By adjusting the transmission ratio of the variable speed gearbox, the drum speed can be accurately controlled, thereby optimizing the threshing effect.

[0003] Currently, when changing speed through gears in the market, most of them are achieved through the meshing of gears of different sizes to achieve different rotation efficiencies. However, repeated adjustment of gear meshing can easily cause gear wear, resulting in failure to mesh and damage to the gearbox. 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 low-vibration split threshing drum speed change gear box, which effectively solves the problem of repeated adjustment of gear meshing and easily causing gear wear.

[0005] To achieve the above object, the present invention provides the following technical solutions: a low-vibration split threshing drum speed change gear box, comprising a speed change gear box housing, a housing cover is hingedly connected to the top of the speed change gear box housing, a speed change adjustment mechanism and a dust prevention mechanism are arranged on the speed change gear box housing, a transmission shaft is arranged on the outer side of the speed change gear box housing, and a connecting mechanism is arranged between the transmission shaft and the speed change gear box housing;

[0006] The speed gearbox housing includes an output shaft rotatably connected to the inside of the speed gearbox housing, one end of the output shaft extends to the outside of the speed gearbox housing, and two intermediate shafts are symmetrically rotatably connected to the inside of the speed gearbox housing, and intermediate small gears and intermediate large gears are fixedly installed on the outsides of the two intermediate shafts, respectively. The inside of the speed gearbox housing is rotatably connected to an input shaft, one end of the input shaft extends to the outside of the speed gearbox housing and is fixedly installed with a drive motor, an L-shaped seat is fixedly connected to the drive motor, and the L-shaped seat is fixed to the outside of the speed gearbox housing, the two intermediate shafts are both located between the output shaft and the input shaft, an input large gear and an input small gear are fixedly installed on the outside of the input shaft, the input large gear is meshingly connected to the intermediate small gear, and the input small gear is meshingly connected to the intermediate large gear.

[0007] Preferably, the outer side of the output shaft is movably sleeved with an outer cylinder, and two upper transmission gears are symmetrically fixedly installed on the outer side of the outer cylinder, two limit grooves are symmetrically provided on the outer side of the output shaft, and two limit blocks are symmetrically fixedly connected to the inner side of the outer cylinder, and the two limit blocks are respectively slidably connected to the two limit grooves, and a collar is sleeved on the outer side of the outer cylinder, and the collar does not contact the outer cylinder, and a support plate located between the two intermediate shafts is fixedly connected to the outer side of the collar, and two side shafts are symmetrically rotatably connected to the outer side of the support plate, and lower transmission gears are fixedly installed on the outer sides of the two side shafts, and the two lower transmission gears are respectively meshed with the two upper transmission gears, and the ends of the two side shafts away from each other are fixedly connected with square blocks, and the ends of the two intermediate shafts close to each other are provided with square grooves, and the two square grooves are adapted to the square blocks.

[0008] Preferably, the outer side of the outer cylinder is symmetrically fixed with two outer rings, the ring is located between the two outer rings, and multiple fixing rods are fixedly connected at equal angles on both sides of the ring, and a ball that fits the outer ring is installed at one end of each fixing rod away from the ring.

[0009] Preferably, the interior of the speed gear box body is fixedly connected with a guide column, the outer side of the guide column is movably sleeved with a guide plate, the guide plate is fixed to the outer side of the support plate, the top of the guide plate is fixedly connected with a top plate, the side of the top plate away from the guide plate extends to the outside of the speed gear box body, and the outside of the speed gear box body is fixedly installed with a mounting block, the mounting block is sleeved on the outer side of the top plate, bolts are provided on the mounting block, two screw holes are provided on the top of the top plate, the mounting block is located between the two screw holes, and the two screw holes are both compatible with the bolts.

[0010] Preferably, the dustproof mechanism includes a fixed frame fixed to the outside of the speed gear box body, the speed gear box body is provided with a heat dissipation port, the fixed frame is arranged at the heat dissipation port, the fixed frame is movably sleeved with a movable frame inside the fixed frame, a dustproof frame is fixedly installed inside the movable frame, and a plurality of filter holes are evenly arranged on the dustproof frame.

[0011] Preferably, the movable frame is symmetrically fixedly connected with two inner blocks inside, the two inner blocks are fixedly connected with side rods, one ends of the two side rods are fixedly connected with side blocks, two side panels are symmetrically fixedly connected inside the heat dissipation port, the two side rods respectively penetrate the two side panels and are movably connected with the two side panels respectively, return springs are fixedly connected with the two side panels, one ends of the two return springs are respectively fixedly connected with the two side blocks, and the two return springs are respectively sleeved on the outsides of the two side rods, a fixed plate is fixedly connected between the two side plates, and a plurality of dredging rods are evenly fixedly connected to one side of the fixed plate close to the dustproof frame, the dredging rods correspond to the filter holes one by one, and the outer diameter value of the dredging rods is equal to the inner diameter value of the filter holes.

[0012] Preferably, the connection mechanism includes a screw fixed to one end of the output shaft, the end of the screw away from the output shaft is fixedly connected to a positioning frame, the end of the transmission shaft close to the screw is fixedly connected to a positioning block, and the positioning block is inserted into the positioning frame.

[0013] Preferably, the outer side of the transmission shaft is fixedly sleeved with a mounting plate, and two grooves are symmetrically provided on the mounting plate. The inner sides of the two grooves are rotatably connected with rotating shafts, and the outer sides of the two rotating shafts are fixedly sleeved with L-shaped plates, and the two L-shaped plates are provided with sockets. The outer side of the positioning frame is symmetrically provided with two abutment rollers, and the two L-shaped plates abut against the two abutment rollers respectively.

[0014] Preferably, two L-shaped round rods are symmetrically fixedly connected between the positioning frame and the speed gear box body, an abutment ring is movably sleeved between the two L-shaped round rods, the abutment ring is sleeved on the outside of the screw and does not contact the screw, and two plug rods are symmetrically fixedly connected to the side of the abutment ring away from the positioning frame, the outer diameters of the two plug rods are equal to the inner diameters of the two insertion holes, and a screw barrel is threadedly sleeved on the outer side of the screw, and the screw barrel is located between the positioning frame and the abutment ring.

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

[0016] 1. The present invention facilitates the rotation of the input large gear and the input small gear through the cooperation between the driving motor and the input shaft, and facilitates the rotation of the two intermediate shafts through the cooperation between the input large gear and the input small gear and the intermediate small gear and the intermediate large gear. The cooperation between the guide column and the guide plate facilitates the movement of the support plate and the collar, so that the outer cylinder can slide on the outside of the output shaft, and one of the blocks can be inserted into the corresponding square groove. The cooperation between the top plate and the mounting block and the bolts and the screw holes facilitates the fixation of the support plate and the collar after movement, and then the speed change of the output shaft can be achieved, so there is no need to repeatedly adjust the gear meshing, avoiding gear wear.

[0017] 2. The invention facilitates heat dissipation inside the speed gear box body through the cooperation between the fixed frame and the heat dissipation port, as well as the dustproof frame and the filter hole, while preventing external dust from entering the speed gear box body. The cooperation between the side plate and the inner block, as well as the side rod and the return spring, facilitates the movement of the dustproof frame to abut against the fixed plate, so that the clearing rod can be inserted into the filter hole, and then the filter hole can be cleared to prevent it from being blocked, thereby facilitating the cleaning of the filter hole.

[0018] 3. The invention facilitates the connection between the transmission shaft and the output shaft through the cooperation between the positioning block and the positioning frame, and facilitates the two insertion rods to be respectively inserted into the two insertion holes through the cooperation between the mounting plate and the L-shaped plate and the abutment ring and the L-shaped round rod. The abutment ring can be limited through the cooperation between the screw rod and the screw barrel, and then the transmission shaft and the output shaft can be fixed to adjust the speed of the threshing drum, so that the speed change gear box housing and the threshing drum adopt a split design, which is convenient for disassembly and maintenance. 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 picture:

[0021] Figure 1 It is a schematic diagram of the structure of the low-vibration split threshing drum speed-changing gearbox of the present invention;

[0022] Figure 2 This is a schematic diagram of the disassembled structure of the speed change gear box body and the box cover of the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the speed adjustment mechanism of the present invention;

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

[0025] Figure 5 It is a schematic diagram of the structure of the guide column of the present invention;

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

[0027] Figure 7 It is a schematic diagram of the structure of the movable frame of the present invention;

[0028] Figure 8 It is a schematic diagram of the structure of the connecting mechanism of the present invention;

[0029] Fig. 9 This is a schematic diagram of the installation disk structure of the present invention.

[0030] In the figure: 1, speed change gear box housing; 2, speed change adjustment mechanism; 201, output shaft; 202, limit groove; 203, collar; 204, square groove; 205, guide column; 206, intermediate small gear; 207, input large gear; 208, input shaft; 209, intermediate shaft; 2010, input small gear; 2011, drive motor; 2012, L-shaped seat; 2013, intermediate large gear; 2014, fixing rod; 2015, ball; 2016, outer ring; 2017, upper transmission gear; 2018, lower transmission gear; 2019, side shaft; 2020, block; 2021, support plate; 2022, limit block; 2023, outer cylinder; 2024, guide plate; 2025, installation Mounting block; 2026, bolt; 2027, screw hole; 2028, top plate; 3, dustproof mechanism; 301, fixed frame; 302, movable frame; 303, dustproof frame; 304, filter hole; 305, inner block; 306, side plate; 307, return spring; 308, fixed plate; 309, dredging rod; 3010, side block; 3011, side rod; 4, connecting mechanism; 401, screw rod; 402, abutment ring; 403, abutment roller; 404, positioning frame; 405, mounting plate; 406, screw barrel; 407, insertion rod; 408, L-shaped round rod; 409, rotating shaft; 4010, L-shaped plate; 4011, positioning block; 4012, jack; 4013, groove; 5, box cover; 6, transmission shaft. DETAILED DESCRIPTION

[0031] 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.

[0032] Embodiment 1, by Figure 1-Figure 9 The present invention relates to a low-vibration split threshing drum speed change gear box, comprising a speed change gear box body 1, a rubber pad is arranged at the bottom of the speed change gear box body 1, the speed change gear box body 1 is fixed to a base through the rubber pad, and can effectively absorb and reduce the vibration generated when the speed change gear box body 1 is working, a case cover 5 is hinged on the top of the speed change gear box body 1, a speed adjustment mechanism 2 and a dust prevention mechanism 3 are arranged on the speed change gear box body 1, a transmission shaft 6 is arranged on the outer side of the speed change gear box body 1, a connecting mechanism 4 is arranged between the transmission shaft 6 and the speed change gear box body 1, and the transmission shaft 6 is arranged at the center of the threshing drum, and when the transmission shaft 6 rotates, the threshing drum can be driven to rotate and disengage.

[0033] Embodiment 2, on the basis of embodiment 1, the speed gearbox housing 1 includes an output shaft 201 rotatably connected to the inside of the speed gearbox housing 1, one end of the output shaft 201 extends to the outside of the speed gearbox housing 1, the inside of the speed gearbox housing 1 is symmetrically rotatably connected to two intermediate shafts 209, the outsides of the two intermediate shafts 209 are respectively fixedly installed with intermediate pinions 206 and intermediate large gears 2013, the inside of the speed gearbox housing 1 is rotatably connected to an input shaft 208, one end of the input shaft 208 extends to the outside of the speed gearbox housing 1 and is fixedly installed with a drive motor 2011, the drive motor 2011 is fixedly connected to an L-shaped seat 2012, the L-shaped seat 2012 is fixed to the outside of the speed gearbox housing 1, and the two intermediate shafts 209 are The output shaft 201 is located between the output shaft 201 and the input shaft 208. An input large gear 207 and an input small gear 2010 are fixedly installed on the outer side of the input shaft 208. The input large gear 207 is meshed with the intermediate small gear 206, and the input small gear 2010 is meshed with the intermediate large gear 2013. An outer cylinder 2023 is movably sleeved on the outer side of the output shaft 201. Two upper transmission gears 2017 are symmetrically fixedly installed on the outer side of the outer cylinder 2023. Two limiting grooves 202 are symmetrically arranged on the outer side of the output shaft 201. Two limiting blocks 2022 are symmetrically fixedly connected on the inner side of the outer cylinder 2023. The two limiting blocks 2022 are respectively slidably connected with the two limiting grooves 202. Through the cooperation between the limiting blocks 2022 and the limiting grooves 202, it is convenient for the outer cylinder 2023 to be moved. The outer side of the outer cylinder 2023 is provided with a sleeve ring 203, and the sleeve ring 203 does not contact the outer cylinder 2023. The outer side of the sleeve ring 203 is fixedly connected with a support plate 2021 located between the two intermediate shafts 209. The outer side of the support plate 2021 is symmetrically connected to two side shafts 2019 for rotation. The outer sides of the two side shafts 2019 are fixedly installed with lower transmission gears 2018. The two lower transmission gears 2018 are respectively meshed with the two upper transmission gears 2017. The ends of the two side shafts 2019 that are away from each other are fixedly connected with blocks 2020. The ends of the two intermediate shafts 209 that are close to each other are provided with square grooves 204, and the two square grooves 204 are adapted to the blocks 2020. The outer side of the outer cylinder 2023 is symmetrically fixedly sleeved. Two outer rings 2016 are connected, and the collar 203 is located between the two outer rings 2016. Multiple fixing rods 2014 are fixedly connected at equal angles on both sides of the collar 203. One end of each fixing rod 2014 away from the collar 203 is installed with a ball 2015 that fits the outer ring 2016. Multiple balls 2015 are arranged between the collar 203 and the outer ring 2016 to avoid direct contact between the collar 203 and the outer ring 2016, thereby facilitating the rotation of the outer cylinder 2023 and the outer ring 2016. A guide column 205 is fixedly connected inside the speed change gear box housing 1, and a guide plate 2024 is movably sleeved on the outer side of the guide column 205. The guide plate 2024 is fixed to the outer side of the support plate 2021, and a top plate 2028 is fixedly connected to the top of the guide plate 2024.The side of the top plate 2028 away from the guide plate 2024 extends to the outside of the speed change gear box housing 1. A mounting block 2025 is fixedly installed on the outside of the speed change gear box housing 1. The mounting block 2025 is sleeved on the outside of the top plate 2028. A bolt 2026 is provided on the mounting block 2025. Two screw holes 2027 are provided on the top of the top plate 2028. The mounting block 2025 is located between the two screw holes 2027, and the two screw holes 2027 are both adapted to the bolts 2026. An auxiliary groove is provided on the top of the top plate 2028 to facilitate pushing and pulling of the top plate 2028.

[0034] First, push and pull the top plate 2028 to drive the guide plate 2024 to slide along the guide column 205, and drive the support plate 2021 and the ring 203 to move. At the same time, the outer cylinder 2023 moves on the outside of the output shaft 201, and the two side shafts 2019 move horizontally, so that one of the blocks 2020 is inserted into the corresponding square groove 204, and then tighten the bolt 2026 and screw it into the corresponding screw hole 2027 to fix the top plate 2028 to the mounting block 2025. When the drive motor 2011 is started, the input shaft 208 is driven to rotate, and the input large gear 207 and the input small gear 2010 are driven to rotate. Since the input large gear 207 and the input small gear 2010 are respectively engaged with the intermediate small gear 206 and the intermediate large gear 2013, the two intermediate shafts 209 are driven to rotate, and finally the speed change of the output shaft 201 is realized, and there is no need to repeatedly adjust the gear meshing to avoid gear wear.

[0035] Embodiment 3, on the basis of embodiment 1, the dustproof mechanism 3 includes a fixed frame 301 fixed to the outside of the speed gear box housing 1, the speed gear box housing 1 is provided with a heat dissipation port, the fixed frame 301 is arranged at the heat dissipation port, the fixed frame 301 is movably sleeved with a movable frame 302 inside, a dustproof frame 303 is fixedly installed inside the movable frame 302, a plurality of filter holes 304 are evenly arranged on the dustproof frame 303, two inner blocks 305 are symmetrically fixedly connected inside the movable frame 302, the two inner blocks 305 are fixedly connected with side rods 3011, one end of the two side rods 3011 is fixedly connected with a side block 3010, and the heat dissipation port is symmetrically fixedly connected with Two side plates 306, two side rods 3011 respectively penetrate the two side plates 306 and are movably connected to the two side plates 306, the two side plates 306 are fixedly connected with return springs 307, one end of the two return springs 307 is fixedly connected to the two side blocks 3010, and the two return springs 307 are respectively sleeved on the outside of the two side rods 3011, a fixed plate 308 is fixedly connected between the two side plates 306, and a plurality of dredging rods 309 are evenly fixedly connected to one side of the fixed plate 308 close to the dustproof frame 303, the dredging rods 309 correspond to the filter holes 304 one by one, and the outer diameter value of the dredging rods 309 is equal to the inner diameter value of the filter hole 304;

[0036] First, a heat dissipation port is opened on the speed gear box housing 1 to facilitate the heat dissipation inside the speed gear box housing 1, and a fixed frame 301 is set at the heat dissipation port. At the same time, a movable frame 302 is movably installed in the fixed frame 301, and a dustproof frame 303 is fixed in the movable frame 302. At the same time, a plurality of filter holes 304 are evenly arranged on the dustproof frame 303 to prevent external dust from entering the speed gear box housing 1. When the movable frame 302 is pushed, the dustproof frame 303 is driven to move, and at the same time, the two side rods 3011 respectively drive the two side blocks 3010 to move. , and the two return springs 307 are stretched until the dustproof frame 303 abuts against the fixed plate 308. At this time, the dredging rod 309 is inserted into the filter hole 304 to dredge it, completing the cleaning of the filter hole 304 to prevent it from being blocked. When the movable frame 302 is released, the movable frame 302 and the dustproof frame 303 are reset under the action of the elastic force of the two return springs 307. At the same time, the dustproof frame 303 is separated from the fixed plate 308, and the dredging rod 309 is separated from the filter hole 304, finally ensuring the circulation of air inside and outside the speed change gear box body 1.

[0037] Embodiment 4, on the basis of embodiment 1, the connecting mechanism 4 includes a screw 401 fixed to one end of the output shaft 201, the end of the screw 401 away from the output shaft 201 is fixedly connected to a positioning frame 404, the end of the transmission shaft 6 close to the screw 401 is fixedly connected to a positioning block 4011, the positioning block 4011 is inserted into the positioning frame 404, the outer side of the transmission shaft 6 is fixedly sleeved with a mounting plate 405, two grooves 4013 are symmetrically provided on the mounting plate 405, the inner sides of the two grooves 4013 are rotatably connected with a rotating shaft 409, the outer sides of the two rotating shafts 409 are fixedly sleeved with L-shaped plates 4010, the two L-shaped plates 4010 are provided with a socket 4012, the outer side of the positioning frame 404 is symmetrically provided with two abutment rollers 403, the two The two L-shaped plates 4010 are respectively in contact with the two abutment rollers 403, and two L-shaped round rods 408 are symmetrically fixedly connected between the positioning frame 404 and the speed change gear box body 1, and an abutment ring 402 is movably sleeved between the two L-shaped round rods 408, and the abutment ring 402 is sleeved on the outside of the screw rod 401 and does not contact the screw rod 401, and two plug rods 407 are symmetrically fixedly connected to the side of the abutment ring 402 away from the positioning frame 404, and the outer diameter values ​​of the two plug rods 407 are equal to the inner diameter values ​​of the two insertion holes 4012, and a screw barrel 406 is threadedly sleeved on the outer side of the screw rod 401, and the screw barrel 406 is located between the positioning frame 404 and the abutment ring 402, and a plurality of auxiliary handles are evenly arranged on the outer side of the screw barrel 406 to facilitate driving the screw barrel 406 to rotate;

[0038] First, insert the positioning block 4011 into the positioning frame 404, then rotate the two L-shaped plates 4010 to abut against the two abutment rollers 403 respectively, and then move the abutment ring 402 away from the positioning frame 404 along the two L-shaped round rods 408 until the abutment ring 402 abuts against the two L-shaped plates 4010, and at the same time, the two insertion rods 407 are respectively inserted into the two insertion holes 4012, and then the screw barrel 406 is rotated. Since the screw barrel 406 is threadedly sleeved on the outside of the screw rod 401, the screw barrel 406 moves horizontally while rotating until the screw barrel 406 abuts against the abutment ring 402 to limit the two insertion rods 407, thereby completing the fixation of the output shaft 201 and the transmission shaft 6 to adjust the speed of the threshing drum. The speed change gear box housing 1 and the threshing drum adopt a split design, which is easy to disassemble and maintain.

Claims

1. A low-vibration split threshing drum speed change gear box, comprising a speed change gear box housing (1), characterized in that: The top of the speed gear box housing (1) is hingedly connected with a housing cover (5); the speed gear box housing (1) is provided with a speed adjustment mechanism (2) and a dust prevention mechanism (3); the outer side of the speed gear box housing (1) is provided with a transmission shaft (6); and a connection mechanism (4) is provided between the transmission shaft (6) and the speed gear box housing (1); The speed change gearbox housing (1) comprises an output shaft (201) rotatably connected to the interior of the speed change gearbox housing (1), one end of the output shaft (201) extends to the outside of the speed change gearbox housing (1), the interior of the speed change gearbox housing (1) is symmetrically rotatably connected to two intermediate shafts (209), the outer sides of the two intermediate shafts (209) are respectively fixedly mounted with intermediate pinions (206) and intermediate large gears (2013), the interior of the speed change gearbox housing (1) is rotatably connected to an input shaft (208), one end of the input shaft (208) extends to the outside of the speed change gearbox housing (1) A driving motor (2011) is fixedly installed, an L-shaped seat (2012) is fixedly connected to the driving motor (2011), the L-shaped seat (2012) is fixed to the outside of the speed change gear box body (1), two intermediate shafts (209) are located between the output shaft (201) and the input shaft (208), an input large gear (207) and an input small gear (2010) are fixedly installed on the outside of the input shaft (208), the input large gear (207) is meshedly connected with the intermediate small gear (206), and the input small gear (2010) is meshedly connected with the intermediate large gear (2013).

2. A low-vibration split threshing drum speed change gearbox according to claim 1, characterized in that: The outer side of the output shaft (201) is movably sleeved with an outer cylinder (2023), and two upper transmission gears (2017) are symmetrically fixedly installed on the outer side of the outer cylinder (2023). The outer side of the output shaft (201) is symmetrically provided with two limit grooves (202), and the inner side of the outer cylinder (2023) is symmetrically fixedly connected with two limit blocks (2022), and the two limit blocks (2022) are respectively slidably connected to the two limit grooves (202). The outer side of the outer cylinder (2023) is sleeved with a sleeve ring (203), and the sleeve ring (203) does not contact the outer cylinder (2023). The outer side of the sleeve ring (203) is fixedly connected with a position A support plate (2021) is disposed between the two intermediate shafts (209), and the outer side of the support plate (2021) is symmetrically rotatably connected to two side shafts (2019), and the outer sides of the two side shafts (2019) are fixedly mounted with lower transmission gears (2018), and the two lower transmission gears (2018) are respectively meshed and connected with the two upper transmission gears (2017), and the ends of the two side shafts (2019) that are away from each other are fixedly connected with blocks (2020), and the ends of the two intermediate shafts (209) that are close to each other are provided with square grooves (204), and the two square grooves (204) are both adapted to the blocks (2020).

3. A low-vibration split threshing drum speed change gearbox according to claim 2, characterized in that: Two outer rings (2016) are symmetrically and fixedly sleeved on the outer side of the outer cylinder (2023); the sleeve ring (203) is located between the two outer rings (2016); a plurality of fixing rods (2014) are fixedly connected at equal angles on both sides of the sleeve ring (203); and a ball (2015) that fits the outer ring (2016) is installed at one end of each fixing rod (2014) away from the sleeve ring (203).

4. A low-vibration split threshing drum speed change gearbox according to claim 1, characterized in that: The interior of the speed change gear box housing (1) is fixedly connected with a guide column (205), the outer side of the guide column (205) is movably sleeved with a guide plate (2024), the guide plate (2024) is fixed to the outer side of the support plate (2021), the top of the guide plate (2024) is fixedly connected with a top plate (2028), and the top plate (2028) extends to the outer side of the speed change gear box housing (1) away from the side of the guide plate (2024). A mounting block (2025) is fixedly mounted on the outer side of the speed change gear box housing (1); the mounting block (2025) is sleeved on the outer side of the top plate (2028); a bolt (2026) is provided on the mounting block (2025); two screw holes (2027) are provided on the top of the top plate (2028); the mounting block (2025) is located between the two screw holes (2027), and the two screw holes (2027) are both compatible with the bolts (2026).

5. The low-vibration split threshing drum speed change gear box according to claim 1, characterized in that: The dustproof mechanism (3) comprises a fixed frame (301) fixed to the outside of a speed change gear box body (1); a heat dissipation port is provided on the speed change gear box body (1); the fixed frame (301) is arranged at the heat dissipation port; a movable frame (302) is movably sleeved inside the fixed frame (301); a dustproof frame (303) is fixedly installed inside the movable frame (302); and a plurality of filter holes (304) are evenly arranged on the dustproof frame (303).

6. A low-vibration split threshing drum speed change gearbox according to claim 5, characterized in that: The movable frame (302) is symmetrically and fixedly connected to two inner blocks (305), the two inner blocks (305) are fixedly connected to side rods (3011), one end of the two side rods (3011) is fixedly connected to a side block (3010), the heat dissipation port is symmetrically and fixedly connected to two side plates (306), the two side rods (3011) respectively penetrate the two side plates (306) and are respectively movably connected to the two side plates (306), the two side plates (306) are fixedly connected to a return spring (307), and the two One end of the return spring (307) is fixedly connected to the two side blocks (3010), and the two return springs (307) are respectively sleeved on the outside of the two side rods (3011). A fixing plate (308) is fixedly connected between the two side plates (306). A plurality of dredging rods (309) are evenly fixedly connected to one side of the fixing plate (308) close to the dustproof frame (303). The dredging rods (309) correspond to the filter holes (304) one by one, and the outer diameter of the dredging rods (309) is equal to the inner diameter of the filter hole (304).

7. The low-vibration split threshing drum speed change gear box according to claim 1, characterized in that: The connection mechanism (4) comprises a screw rod (401) fixed to one end of the output shaft (201); the end of the screw rod (401) away from the output shaft (201) is fixedly connected to a positioning frame (404); the end of the transmission shaft (6) close to the screw rod (401) is fixedly connected to a positioning block (4011); and the positioning block (4011) is inserted into the positioning frame (404).

8. The low-vibration split threshing drum speed change gearbox according to claim 1, characterized in that: The outer side of the transmission shaft (6) is fixedly sleeved with a mounting plate (405), two grooves (4013) are symmetrically provided on the mounting plate (405), the inner sides of the two grooves (4013) are rotatably connected with a rotating shaft (409), the outer sides of the two rotating shafts (409) are fixedly sleeved with an L-shaped plate (4010), the two L-shaped plates (4010) are provided with a plug hole (4012), and the outer side of the positioning frame (404) is symmetrically provided with two abutment rollers (403), and the two L-shaped plates (4010) are respectively abutted against the two abutment rollers (403).

9. The low-vibration split threshing drum speed change gearbox according to claim 7, characterized in that: Two L-shaped round rods (408) are symmetrically fixedly connected between the positioning frame (404) and the speed change gear box housing (1); an abutment ring (402) is movably sleeved between the two L-shaped round rods (408); the abutment ring (402) is sleeved on the outside of the screw rod (401) and does not contact the screw rod (401); two insertion rods (407) are symmetrically fixedly connected to the side of the abutment ring (402) away from the positioning frame (404); the outer diameters of the two insertion rods (407) are equal to the inner diameters of the two insertion holes (4012); a screw barrel (406) is threadedly sleeved on the outer side of the screw rod (401); and the screw barrel (406) is located between the positioning frame (404) and the abutment ring (402).

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