Threshing device with adjustable threshing diameter and combine harvester

Abstract

The present invention provides a threshing drum and a combine harvester with adjustable threshing diameter, comprising a threshing drum, a diameter adjusting device, a driving device, and a locking device. The diameter adjusting device is located inside the front and rear supporting width discs of the threshing drum. Two driving and locking schemes, electric and manual, are adopted. The driving device transmits power to the diameter adjusting device. The threshing diameter of the drum can be adjusted steplessly through the diameter adjusting device. At the same time, the locking device can effectively lock the adjusted drum diameter to ensure the stability of the drum operation. The present invention can conveniently and quickly adjust the threshing diameter of the drum of the combine harvester, so that the threshing linear speed and threshing gap of the threshing drum can be adjusted at any time according to the harvesting situation, thereby improving the threshing adaptability of the combine harvester.

Description

Technical Field

[0001] The invention relates to the technical field of harvesting machinery, in particular to a combine harvester for harvesting cereal crops, in particular to a threshing device with adjustable threshing diameter. Background Art

[0002] The threshing device is the core component of the threshing device of the combine harvester, and plays the role of threshing the plants. Among them, the threshing gap of the threshing device is an important factor affecting the working quality of the combine harvester. During the actual harvesting process, the operating conditions of the combine harvester will change in real time. If the operating parameters of the threshing device are not adjusted as the operating conditions change, the operating performance of the combine harvester will be seriously affected. The existing methods of changing the threshing gap are mostly to adjust the distance between the concave screen and the threshing drum, and then change the entire threshing gap, but this adjustment method will firstly cause the threshing gap in the threshing device to be uneven, affecting the fluidity of the material in the threshing device; secondly, it only changes the threshing gap alone, and cannot change the linear speed of the threshing element, which does not greatly improve the threshing adaptability of the combine harvester. Summary of the invention

[0003] In view of the shortcomings in the prior art, the present invention provides a threshing device with adjustable diameter, which is divided into two types: manual adjustment and electric adjustment. The adjustment method is convenient and quick, and the threshing diameter of the threshing device can be adjusted steplessly without disassembling the threshing drum, thereby effectively improving the threshing adaptability of the threshing drum.

[0004] The present invention achieves the above technical objectives through the following technical means.

[0005] A threshing drum with adjustable threshing diameter, characterized in that it comprises a threshing drum, a diameter adjusting device, a driving device, and a locking device;

[0006] The threshing drum comprises a drum shaft, a front supporting width disc, a middle supporting width disc, a rear supporting width disc, and a threshing gear rod which are sequentially mounted on the drum shaft from front to rear along the power transmission direction, and the threshing gear rod is movably mounted on the front supporting width disc, the middle supporting width disc, and the rear supporting width disc in the radial direction of the threshing drum;

[0007] The diameter adjustment device comprises a driving disc gear, a driving large gear, a driving small gear, a transmission shaft, a worm, a worm wheel, a fixing nut 1, a fixing nut 2, a movable nut, and a trapezoidal screw. The driving large gear is sleeved on the drum shaft through a bearing, the driving disc gear is fixed on the driving large gear through a spline connection, the driving small gear meshes with the driving large gear, one end of the transmission shaft is fixed to the driving small gear, and the other end passes through the front supporting width plate, the middle supporting width plate, and the rear supporting width plate. The worm is sleeved on the transmission shaft through a key connection and is fixed to rotate synchronously with the transmission shaft; the worm wheel is sleeved on the trapezoidal screw through a key connection and is sandwiched between the fixing nut 1 and the fixing nut 2 to limit its axial movement; the worm wheel is meshedly connected with the worm, the fixing nut 1 and the fixing nut 2 are fixed to the supporting width plate through a bolt connection, the movable nut is fixed to the toothed rod connecting rod, the trapezoidal screw, the fixing nut 1 and the fixing nut 2, and the movable nut constitute a screw mechanism for driving the threshing tooth rod to move in the radial direction of the threshing drum;

[0008] The driving device is fixed on the frame of the combine harvester, does not rotate synchronously with the threshing drum, and is used to drive the driving disc gear;

[0009] The locking device includes a toothed sleeve, a shift fork, a compression spring, and a tension spring. The toothed sleeve is axially movable and sleeved on the drum shaft, and rotates with the drum shaft at all times. Both ends are provided with toothed teeth, which can mesh with the machine body or the driving gear to form a toothed structure. The middle of the toothed sleeve is an annular groove, one end of the shift fork is stuck in the annular groove, a compression spring is arranged between the shift fork and the frame, and the other end of the shift fork passes through the frame plate, and a tension spring is fixed on the end.

[0010] Furthermore, the tension spring in the locking device is provided with pulling force by a handle and / or an electric push rod, the handle is inserted into the groove of a support sleeve, the support sleeve is fixed to the outside of the frame, one end of the support sleeve has a long groove and a short groove, the long axis of the tension spring and the shift fork are sleeved into the support sleeve; the electric push rod is fixed on the frame and passes through the fuselage, the push rod end of the electric push rod is fixed with a push rod locking pin; the handle and the push rod locking pin are both connected to the end of the tension spring.

[0011] Furthermore, the diameter adjustment device also includes a diameter adjustment device protection cover, which is located between the front support web, the middle support web and the rear support web, and is fixed on the web to wrap the entire diameter adjustment device.

[0012] Furthermore, there are six transmission shafts, which are evenly distributed and parallel to the drum axis, and bearings are arranged between the front supporting web, the middle supporting web and the rear supporting web.

[0013] Further, the driving device is a manual driving device, which includes a manual driving shaft rotatably mounted on the frame of the combine harvester, a manual driving gear fixed to one end of the manual driving shaft, and a disc-shaped handle sleeved on the other end of the manual driving shaft, the manual driving shaft passes through the fuselage of the combine harvester and is fixed to the frame of the combine harvester through a bearing, and the disc-shaped handle is located outside the combine harvester and is fixedly sleeved on the manual driving shaft through a square groove;

[0014] Furthermore, the drive device is an electric drive device, which includes an electric drive shaft rotatably mounted on the combine harvester frame, a tooth clutch fixed on the electric drive shaft, an electric drive gear sleeved on one end of the electric drive shaft through a bearing, and a motor fixed on the frame. The electric drive gear and the tooth clutch are fixedly connected, the tooth clutch controls the power input of the electric drive gear, and the electric drive shaft is fixedly sleeved into the output hole of the motor through a spline.

[0015] Furthermore, there are two middle support width discs, and each of the front support width disc, the middle support width disc, and the rear support width disc is provided with a set of diameter adjustment devices. In two of the diameter adjustment devices, the worm gear is right-handed, and the trapezoidal lead screw has positive thread on the fixed nut side and negative thread on the movable nut side; while in the other two sets of diameter adjustment devices, the worm gear is left-handed, and the trapezoidal lead screw has negative thread on the fixed nut side and positive thread on the movable nut side.

[0016] Furthermore, the meshing threads of the trapezoidal screw rod and the fixed nut 1 and the fixed nut 2 have opposite rotation directions to the threads meshing with the movable nut. Between the two meshing threads of the trapezoidal screw rod and the fixed nut 1 and the fixed nut 2 is an internal key shaft for meshing with the worm gear to drive the movable nut to move up and down.

[0017] Furthermore, it also includes a controller and a displacement sensor, wherein the displacement sensor is installed on the front support width plate, the middle support width plate or the rear support width plate, and is used to detect the distance that the threshing gear rod moves; the displacement sensor is communicatively connected to the controller, and the controller is also connected to the electric push rod, the tooth clutch, and the motor. The controller controls the operation of the electric push rod, the tooth clutch, and the motor according to the distance that the threshing gear rod moves detected by the displacement sensor, so as to realize the start and stop of the threshing gear rod adjustment.

[0018] Furthermore, the front support width disc, the middle support width disc and the rear support width disc are all provided with radially arranged I-shaped guide rails, the gear rod connecting rod can be slidably installed in the I-shaped guide rails, the threshing gear rod is fixed to the end of the gear rod connecting rod, and the movable nut engaged with the upper end of the trapezoidal screw rod is fixed on the gear rod connecting rod.

[0019] The beneficial effects of the drum with adjustable threshing diameter described in the present invention are:

[0020] In the present invention, the adjustment method for adjusting the roller threshing diameter is convenient and quick, and the stepless adjustment of the roller threshing diameter can be achieved without removing the roller or opening the shell of the combine harvester. It is more flexible than the traditional stepless adjustment method of the roller threshing diameter. When the combine harvester is operating in the field, the diameter of the threshing roller can be steplessly adjusted according to the actual situation of the grain, so that the linear speed of the threshing element and the threshing gap reach appropriate values, which greatly improves the adaptability and harvesting efficiency of the combine harvester.

[0021] The diameter adjustment device is driven by a worm gear and a lead screw mechanism, so it has double self-locking properties. At the same time, a tooth device is used in the locking to ensure that the drum diameter is locked or adjusted, thereby ensuring the operating stability of the threshing drum.

[0022] By effectively controlling the threshing diameter of the drum, the material conveying capacity is improved and material blockage is avoided; the driving device is arranged outside the threshing drum and does not rotate with the drum. At the same time, the diameter adjustment device is installed and fixed with the drum shaft as the axis, which effectively ensures the dynamic balance stability of the threshing drum and prevents problems such as unstable dynamic balance of the drum caused by adding adjustment equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is a schematic diagram of the structure of the threshing drum with adjustable threshing diameter.

[0024] Figure 2 It is a cross-sectional view of the structure of a threshing drum with adjustable threshing diameter.

[0025] Figure 3 It is a schematic diagram of the diameter adjustment device and the drive device of the motor-driven version.

[0026] Figure 4 This is a schematic diagram of the diameter adjustment device and drive device of the manual drive version.

[0027] Figure 5 This is a partial enlarged view of the diameter adjustment structure.

[0028] In the figure,

[0029] 101. Supporting width disc one, 102. Supporting width disc two, 103. Supporting width disc three, 104. Supporting width disc four, 105 threshing gear rod, 106. Gear rod connecting rod, 107. Drum shaft, 108 I-shaped guide rail, 109 spiral feeding wheel;

[0030] 201. driving plate gear, 202. driving large gear, 203. driving small gear, 204. transmission shaft, 205. worm, 206. worm wheel, 207. fixing nut 1, 208. fixing nut 2, 209. movable nut, 210. trapezoidal lead screw, 211. protective cover of diameter adjustment device;

[0031] 301. manual drive shaft, 302. manual drive gear, 303. disc handle, 304. electric drive shaft, 305. tooth clutch, 306. electric drive gear, 307 motor, 308. drive device protection cover;

[0032] 401. tooth nesting cylinder, 402. shift fork, 403. compression spring, 404. extension spring, 405. support sleeve, 406. handle, 407. electric push rod, 408. push rod locking pin;

[0033] 501. Fuselage. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0035] like Figure 1 As shown, the diameter-adjustable threshing drum described in the present invention includes a threshing drum, a diameter adjusting device, a driving device, and a locking device. The diameter adjusting device is located inside the threshing drum, and passes through the supporting width plate 4 104, the supporting width plate 3 103, the supporting width plate 2 102, and the supporting width plate 1 101. The driving device and the locking device are located at the rear of the threshing drum, and are installed on the outside of the supporting width plate 1 101 of the threshing drum.

[0036] The threshing drum includes a drum shaft 107, a spiral feeding wheel 109, a support web plate 4 104, a support web plate 3 103, a support web plate 2 102, and a support web plate 1 101, which are sequentially installed on the drum shaft 107 from front to back along the material transfer direction, and a threshing gear rod 105 installed on the support web plate 4 104, the support web plate 3 103, the support web plate 2 102, and the support web plate 1 101, and the threshing gear rod 105 can move radially in the threshing drum. Specifically, in this embodiment, the threshing gear rod 105 is welded with a gear rod connecting rod 106 at the place where it contacts the support web plate, and the gear rod connecting rod 106 is placed in the I-shaped guide rail 108 on the support web plate, and the threshing gear rod 105 is moved radially in the threshing drum by sliding the gear rod connecting rod 106 in the I-shaped guide rail 108, so as to ensure the variable diameter of the threshing drum.

[0037] like Figure 2As shown, the diameter adjustment device includes a driving disc gear 201, a driving gear 202, a driving pinion 203, a transmission shaft 204, a worm 205, a worm wheel 206, a fixing nut 1 207, a fixing nut 208, a movable nut 209, a trapezoidal screw 210, and a diameter adjustment device protective cover 211. The diameter adjustment device protective cover 211 is fixed on the web and wraps the entire diameter adjustment device. The driving disc gear 201 is fixed on the driving gear 202 through a spline connection, and the driving gear 202 is sleeved on the drum shaft 107 through a needle bearing and can rotate on the drum shaft 107. At the same time, a thrust bearing is installed between the driving gear 202 and the supporting web to limit the movement of its bearing, and there are bearings between the transmission shaft 204 and the supporting web to limit their axial and radial displacement.

[0038] Six transmission shafts 204 pass through the supporting web disc 4 104, the supporting web disc 3 103, the supporting web disc 2 102, and the supporting web disc 1 101, and are installed in the holes on the web disc through bearings. The driving pinion 203 is fixed to the end of the transmission shaft 204 and meshes with the driving gear 202. The six transmission shafts 204, the six driving pinions 203, and the six sets of diameter adjustment devices are evenly spaced and placed parallel to the drum axis.

[0039] like Figure 5 As shown, the worm 205 is fixedly sleeved on the transmission shaft 204 through a key connection, and rotates synchronously with the transmission shaft 204. The worm wheel 206 is sleeved on the trapezoidal lead screw 210 through a key connection, and is sandwiched between the fixing nut 1 207 and the fixing nut 208 to limit its axial movement. The worm wheel 206 and the worm 205 are meshed and connected; the fixing nut 1 207 and the fixing nut 208 are fixed on the supporting web plate through bolt connection, and the movable nut 209 is fixed on the gear rod connecting rod 106. The trapezoidal lead screw 210, the fixing nut 1 207, the fixing nut 208, and the movable nut 209 constitute a screw mechanism to drive the threshing gear rod to move in the radial direction of the threshing cylinder. There is a diameter adjustment device protection cover 211 between the supporting web plates, which is fixed on the web plate and wraps the entire diameter adjustment device.

[0040] The trapezoidal lead screw 210 is divided into three sections. The one that meshes with the fixed nut 1 207 is a section of thread with a slightly smaller diameter, and the one that meshes with the fixed nut 208 is a section of thread with a slightly larger diameter. The two sections of thread have the same rotation direction and the same lead. There is an internal key shaft between the two sections of thread, and the one that meshes with the movable nut 209 is a section of thread with an opposite rotation direction, which is used to drive the movable nut 209 to move up and down.

[0041] Each of the four spokes has a set of diameter adjustment devices. In two of the diameter adjustment devices, the worm gear 206 and the worm 205 are right-handed, and the trapezoidal screw 210 has a positive thread on the fixed nut side and a negative thread on the movable nut 209 side; while the worm gear 205 of the other two diameter adjustment devices is left-handed, and the trapezoidal screw 210 has a negative thread on the fixed nut side and a positive thread on the movable nut 209 side. The two diameter adjustment devices have opposite directions in order to offset the axial force when the worm gear is driven.

[0042] The inner key shaft of the middle section of the trapezoidal lead screw 210 meshes with the inner hole of the worm wheel 206, and the worm wheel 206 can slide along the inner key shaft, but keep rotating synchronously. The worm wheel 206 between the fixing nut 1 207 and the fixing nut 2 208 is fixed in the middle by the fixing nut 1 207 and the fixing nut 2 208 through the thrust bearings at both ends, so that the movement of the bearing is limited, while it can rotate normally.

[0043] like Figure 3 , Figure 4 As shown, the driving device is divided into two types: a manual driving device and an electric driving device. The entire driving device is fixed on the frame of the combine harvester and does not rotate synchronously with the threshing drum.

[0044] The manual drive device comprises a manual drive shaft 301 rotatably mounted on the combine harvester frame, a manual drive gear 302 fixed to one end of the manual drive shaft 301, and a disc-shaped handle 303 sleeved on the other end of the manual drive shaft 301. The manual drive shaft 301 passes through the combine harvester body 501 and is fixed to the combine harvester frame through a bearing. The disc-shaped handle 303 is located outside the combine harvester and is fixedly sleeved on the manual drive shaft 301 through a square groove.

[0045] The electric drive device includes an electric drive shaft 304 rotatably mounted on the frame of the combine harvester, a tooth clutch 305 fixed on the electric drive shaft 304, an electric drive gear 306 sleeved on one end of the electric drive shaft 304 through a bearing, and a motor 307 fixed on the frame. The electric drive gear 306 and the tooth clutch 305 are fixedly connected. The tooth clutch 305 can control the power input of the electric drive gear 306. The electric drive shaft 304 is fixedly sleeved into the output hole of the motor 307 through a spline.

[0046] The electric drive device adopts a tooth clutch 305. When the roller diameter needs to be adjusted, the tooth clutch 305 is engaged and the electric drive gear 306 obtains power input; when the roller diameter does not need to be adjusted, the tooth clutch 305 is disengaged and the electric drive gear 306 disconnects the power connection with the motor 307 to avoid damage to the motor 307.

[0047] Furthermore, the entire drive device is covered by the drive device protection cover 308 to protect the drive device.

[0048] The locking device is divided into two types: a manual locking device and an electric locking device;

[0049] The manual locking device includes a toothed sleeve 401, a shift fork 402, a compression spring 403, a tension spring 404, a support sleeve 405, and a handle 406. The toothed sleeve 401 is sleeved on the drum shaft 107 through a spline, can slide on the drum shaft 107, and rotates with the drum shaft 107 at all times. There are toothed teeth at both ends, which can mesh with the machine body 501 or the driving large gear 202 to form a toothed structure; the middle of the toothed sleeve 401 is an annular groove, one end of the shift fork 402 is stuck in the annular groove, a compression spring 403 is arranged between the shift fork 402 and the frame, and the other end passes through the frame plate, and a tension spring 404 is fixed at the end, and the other end of the tension spring 404 is fixed to the handle 406; the support sleeve 405 is fixed to the outside of the frame, one end of which has a long groove and a short groove, the long axis of the tension spring 404 and the shift fork 402 is sleeved into the support sleeve 405, and the handle 406 is stuck into the support sleeve 40 5; when the handle 406 is pulled to the short groove of the support sleeve 405, the tension spring 404 is in a stretched state and the compression spring 403 is in a compressed state, but the elastic force of the tension spring 404 is greater than the compression spring 403, so the fork 402 is subjected to a force in the direction of the body 501, and finally the tooth nested cylinder 401 and the body 501 are meshed, at this time the threshing drum and the frame are fixed together to prevent the drum from being driven to rotate when the drum diameter is adjusted; when the handle 406 is pulled to the long groove of the support sleeve 405, the tension spring 404 is in a free state, and the compression spring 403 is in a compressed state, so the fork 402 is subjected to a force in the direction of the driving gear 202, and finally the tooth nested cylinder 401 and the driving gear 202 are meshed, at this time the threshing drum and the diameter adjustment device are fixed together to prevent the threshing drum from changing its diameter during operation and causing an accident.

[0050] The electric locking device includes a toothed nested cylinder 401, a shift fork 402, a compression spring 403, a tension spring 404, an electric push rod 407, and a push rod locking pin 408. The toothed nested cylinder 401 is sleeved on the drum shaft 107 through a spline and can slide on the drum shaft 107. Both ends are respectively meshed with the machine body 501 and the driving large gear 202 to form a toothed structure; the middle of the toothed nested cylinder 401 is an annular groove, one end of the shift fork 402 is stuck in the annular groove, a compression spring 403 is arranged between the shift fork 402 and the frame, and the other end passes through the frame plate, and a tension spring 404 is fixed at the end. The electric push rod 407 is fixed on the frame, the push rod passes through the machine body 501, the push rod locking pin 408 is fixed at the push rod end, and the tension spring 404 is fixed at the other end of the push rod locking pin 408.

[0051] When the electric push rod 407 is extended, the tension spring 404 is in a stretched state and the compression spring 403 is in a compressed state, but the elastic force of the tension spring 404 is greater than that of the compression spring 403, so the fork 402 is subjected to a force in the direction of the body 501, and finally the tooth nested cylinder 401 and the body 501 are meshed. At this time, the threshing drum and the frame are fixed together to prevent the drum from being driven to rotate when the drum diameter is adjusted; when the electric push rod 407 is shortened, the tension spring 404 is in a free state and the compression spring 403 is in a compressed state, so the fork 402 is subjected to a force in the direction of the driving gear 202, and finally the tooth nested cylinder 401 and the driving gear 202 are meshed. At this time, the threshing drum and the diameter adjustment device are fixed together to prevent the threshing drum from changing its diameter during operation and causing an accident.

[0052] Furthermore, the electric push rod 407 and the shift fork 402 both pass through the body 501 via linear bearings and can move back and forth along a linear direction.

[0053] The shift fork 402 is necessarily in a state of being shifted toward the frame or driving the large gear 202 due to the spring force at both ends, so the tooth nest cylinder 401 is always in a state of being meshed with the machine body 501, meshed with the driving large gear 202, or not meshed with each other, effectively preventing the threshing cylinder from being stuck.

[0054] For the manual driving device and locking device, when the diameter of the threshing drum needs to be adjusted, the combine harvester is stopped and the drum is disengaged from the rotation. First, the handle 406 of the locking device is pulled to the short groove of the support sleeve 405, and the toothed cylinder 401 is pulled toward the machine body 501. After several rotations of the threshing drum, the toothed cylinder 401 is meshed with the machine body 501, and the threshing drum is locked and rotated. Then, the disk handle 303 is rotated manually, and the manual drive gear 302 is driven through the manual drive shaft 301, and finally the driving gear 202 is driven. By changing the manual rotation direction, controls the different rotation directions of the driving gear 202, and finally drives the trapezoidal screw 210 to rotate through the worm gear, drives the movable nut 209 to move up and down, and then drives the threshing gear rod 105 to rise or fall, and adjusts the diameter of the drum; when the diameter of the threshing drum reaches the expected value, pulls the handle 406 of the locking device to the long groove of the supporting sleeve 405, and the tooth nesting cylinder 401 is pressed by the compression spring 403 toward the driving gear 202. After the threshing drum rotates several times, the tooth nesting cylinder 401 meshes with the driving gear 202, and the threshing drum is locked with the diameter adjustment device.

[0055] For the electric drive device and locking device, when the diameter of the threshing drum needs to be adjusted, the combine harvester is stopped, the detached drum stops rotating, the electric push rod 407 is extended, and the toothed cylinder 401 is pulled in the direction of the machine body 501. After the threshing drum rotates several times, the toothed cylinder 401 meshes with the machine body 501, and the threshing drum is locked to rotate. Then, the motor 307 provides power, the toothed clutch 305 is attracted, and the power is transmitted to the lead screw through the driving gear, the driving pinion, and the worm gear 205. By changing the rotation direction of the motor 307, the control The different rotation directions of the driving gear are controlled, and finally the trapezoidal screw 210 is driven to rotate through the worm gear 205, which drives the movable nut 209 to move up and down, and then drives the threshing gear rod 105 to rise or fall, and adjust the diameter of the drum; when the diameter of the threshing drum reaches the expected value, the tooth clutch 305 is disengaged, and the electric push rod 407 is shortened, and the tooth nesting cylinder 401 is pressed by the compression spring 403 toward the driving gear 202. After several rotations of the threshing drum, the tooth nesting cylinder 401 is meshed with the driving gear 202, and the threshing drum is locked with the diameter adjustment device.

[0056] The specific working process of the threshing drum with adjustable threshing diameter is as follows:

[0057] For manually driven variable diameter threshing units.

[0058] When the diameter of the threshing drum needs to be adjusted according to different situations during the harvesting process of the combine harvester, the handle 406 is manually pulled to the short groove of the support sleeve 405, the toothed sleeve 401 and the fuselage 501 are meshed, the threshing drum is locked and rotated, and then the disk-shaped handle 303 is turned, and the power is transmitted to the manual driving gear 302 through the manual driving shaft 301, the manual driving gear 302 and the driving disk gear 201 are always meshed, and the power is transmitted to the driving pinion 203 through the driving gear 202, and the driving pinion 203 drives the transmission shaft 204 to rotate, and the worm 205 is fixed on the transmission shaft 204, driving the worm wheel 206 to rotate, and the worm wheel 206 drives the trapezoidal screw rod 210 to rotate, and the trapezoidal screw rod 210 is screwed in or out at the fixed nut, and the thread at the movable nut 209 is in the opposite direction, so it moves up and down under the drive of the trapezoidal screw rod 210, and then the rack rod connecting rod 106 rises or falls, so as to adjust the diameter of the threshing drum;

[0059] When the diameter value reaches the working requirement of the combine harvester, the handle 406 is manually adjusted to the long groove of the support sleeve 405, the tooth nesting cylinder 401 and the driving large gear 202 are meshed, the threshing drum and the diameter adjustment device are locked together, and the diameter of the threshing drum is locked. The worm gear 206, the worm 205 and the trapezoidal lead screw have self-locking ability, and the locking device belongs to the three-level locking, which can effectively ensure the locking performance of the threshing drum after the diameter is adjusted, thereby ensuring the operation stability of the threshing drum.

[0060] For the variable diameter threshing device driven by motor 307:

[0061] When the diameter of the threshing drum needs to be adjusted according to different situations during the harvesting process of the combine harvester, the electric push rod 407 is extended, the tooth nest cylinder 401 and the fuselage 501 are meshed, the threshing drum is locked and rotated, and then the motor 307 rotates, and the power is transmitted to the tooth clutch 305 through the manual drive shaft 301, and the tooth clutch 305 is sucked to drive the electric drive gear 306. The electric drive gear 306 and the drive plate gear 201 are always meshed, and the power is transmitted to the driving pinion 203 through the driving gear 202. The driving pinion 203 drives the transmission shaft 204 to rotate, and the worm 205 is fixed on the transmission shaft 204, driving the worm wheel 206 to rotate, and the worm wheel 206 drives the trapezoidal screw rod 210 to rotate. The trapezoidal screw rod 210 is screwed in or out at the fixed nut. The thread at the movable nut 209 is in the opposite direction, so it moves up and down under the drive of the trapezoidal screw rod 210, and then the rack rod connecting rod 106 rises or falls, thereby adjusting the diameter of the threshing drum;

[0062] When the diameter value reaches the working requirement of the combine harvester, the tooth clutch 305 is disengaged, the motor 307 stops rotating, and the electric push rod 407 is shortened, the tooth nest cylinder 401 and the driving gear 202 are meshed, and the threshing drum is locked with the diameter adjustment device, and the diameter of the threshing drum is locked. The worm gear 206, the worm 205 and the trapezoidal lead screw have self-locking ability, and the locking device belongs to the three-level locking, which can effectively ensure the locking performance of the threshing drum after the diameter is adjusted, thereby ensuring the operation stability of the threshing drum.

[0063] When the electric drive solution is adopted, the control process is as follows:

[0064] When the roller diameter needs to be adjusted, the required diameter value is manually input into the controller, and the processor determines the rotation direction of the motor 307 by comparing and calculating the set diameter value and the current roller diameter value detected by the displacement sensor. The controller controls the electric push rod 407 to extend, the tooth clutch 305 to engage, and the motor 307 to rotate according to the processor output signal. When the processor detects that the set diameter value is consistent with the current roller diameter value detected by the displacement sensor, a signal is sent to the controller to control the electric push rod 407 to shorten, the tooth clutch 305 to disengage, and the motor 307 to stop rotating.

[0065] The embodiments are preferred implementations of the present invention, but the present invention is not limited to the above-mentioned implementations. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essential content of the present invention belong to the protection scope of the present invention.

Claims

1. A threshing drum with adjustable threshing diameter, It is characterized in that It includes a threshing drum, a diameter adjustment device, a driving device, and a locking device; The threshing drum comprises a drum shaft (107), a front supporting width disc (101), middle supporting width discs (102, 103), and a rear supporting width disc (104) which are sequentially mounted on the drum shaft (107) from front to rear along the power transmission direction, and a threshing gear rod (105); the threshing gear rod (105) is movably mounted on the front supporting width disc (101), the middle supporting width discs (102, 103), and the rear supporting width disc (104) in the radial direction of the threshing drum; The diameter adjustment device comprises a driving disc gear (201), a driving large gear (202), a driving small gear (203), a transmission shaft (204), a worm (205), a worm wheel (206), a fixing nut 1 (207), a fixing nut 2 (208), a movable nut (209), and a trapezoidal screw (210); the driving large gear (202) is sleeved on the drum shaft (107) via a bearing; the driving disc gear (201) is fixed on the driving large gear (202) via a spline connection; the driving small gear (203) is meshed with the driving large gear (202); one end of the transmission shaft (204) is fixed to the driving small gear (203), and the other end passes through the front support width disc (101), the middle support width discs (102, 103), and the rear support width disc (10 4), the worm (205) is fixedly sleeved on the transmission shaft (204) through a key connection, and rotates synchronously with the transmission shaft (204); the worm wheel (206) is sleeved on the trapezoidal lead screw (210) through a key connection, and is sandwiched between the fixing nut 1 (207) and the fixing nut 2 (208) to limit its axial movement; the worm wheel (206) and the worm (205) are meshed and connected, the fixing nut 1 (207) and the fixing nut 2 (208) are fixed to the supporting width plate through bolt connection, the movable nut (209) is fixed on the toothed rod connecting rod (106), the trapezoidal lead screw (210) and the fixing nut 1 (207) and the fixing nut 2 (208), and the movable nut (209) constitute a screw mechanism, which is used to drive the threshing toothed rod (105) to move in the radial direction of the threshing cylinder; The driving device is fixed on the frame of the combine harvester, does not rotate synchronously with the threshing drum, and is used to drive the driving disc gear (201); The locking device comprises a toothed sleeve (401), a shift fork (402), a compression spring (403), and a tension spring (404); the toothed sleeve (401) is axially movably sleeved on the drum shaft (107) and rotates with the drum shaft (107) at all times; two ends of the toothed sleeve are provided with toothed teeth respectively and can mesh with the machine body (501) or the driving gear (202) to form a toothed structure; the middle of the toothed sleeve (401) is an annular groove, one end of the shift fork (402) is stuck in the annular groove, a compression spring (403) is arranged between the shift fork (402) and the frame, and the other end of the shift fork (402) passes through the frame plate, and a tension spring (404) is fixed at the end.

2. The threshing drum with adjustable threshing diameter according to claim 1, It is characterized in that The tension spring (404) in the locking device is provided with a pulling force by a handle (406) and / or an electric push rod (407); the handle (406) is inserted into a groove of a support sleeve (405); the support sleeve (405) is fixed to the outside of the frame and has a long groove and a short groove at one end; the long axis of the tension spring (404) and the shift fork (402) is sleeved into the support sleeve (405); the electric push rod (407) is fixed to the frame and passes through the machine body (501); the push rod end of the electric push rod (407) is fixed with a push rod locking pin (408); the handle (406) and the push rod locking pin (408) are both connected to the end of the tension spring (404).

3. The threshing drum with adjustable threshing diameter according to claim 1, It is characterized in that The diameter adjustment device further comprises a diameter adjustment device protection cover (211), wherein the diameter adjustment device protection cover (211) is located between the front support web (101), the middle support webs (102, 103), and the rear support web (104), and is fixed on the webs to cover the entire diameter adjustment device.

4. The threshing drum with adjustable threshing diameter according to claim 1, It is characterized in that There are six transmission shafts (204), which are evenly distributed and parallel to the drum shaft (107), and bearings are arranged between the front support disc (101), the middle support discs (102, 103), and the rear support disc (104).

5. The threshing drum with adjustable threshing diameter according to claim 1, It is characterized in that The driving device is a manual driving device and / or an electric driving device, and the manual driving device comprises a manual driving shaft (301) rotatably mounted on a combine harvester frame, a manual driving gear (302) fixed to one end of the manual driving shaft (301), and a disk-shaped handle (303) sleeved on the other end of the manual driving shaft (301); the manual driving shaft (301) passes through a combine harvester body (501) and is fixed to the combine harvester frame via a bearing; the disk-shaped handle (303) is located outside the combine harvester and is fixedly sleeved on the manual driving shaft (301) via a square groove; The electric drive device comprises an electric drive shaft (304) rotatably mounted on a combine harvester frame, a tooth clutch (305) fixed on the electric drive shaft (304), an electric drive gear (306) sleeved on one end of the electric drive shaft (304) through a bearing, and a motor (307) fixed on the frame. The electric drive gear (306) and the tooth clutch (305) are fixedly connected. The tooth clutch (305) controls the power input of the electric drive gear (306). The electric drive shaft (304) is fixedly sleeved into an output hole of the motor (307) through a spline.

6. The threshing drum with adjustable threshing diameter according to claim 1, It is characterized in that There are two middle support width discs (102, 103), and each of the front support width disc (101), the middle support width disc (102, 103), and the rear support width disc (104) is provided with a set of diameter adjustment devices. In two of the diameter adjustment devices, the worm gears are right-handed, and the trapezoidal screw (210) has positive threading on the fixed nut side and negative threading on the movable nut side; while in the other two diameter adjustment devices, the worm gears are left-handed, and the trapezoidal screw (210) has negative threading on the fixed nut side and positive threading on the movable nut side.

7. The threshing drum with adjustable threshing diameter according to claim 1, Features: The meshing threads of the trapezoidal lead screw (210) and the fixed nut 1 (207) and the fixed nut 2 (208) are in opposite rotation direction to the meshing threads of the movable nut. The meshing threads of the trapezoidal lead screw (210) and the fixed nut 1 (207) and the fixed nut 2 (208) are meshed with each other. An internal key shaft is provided between the two threads for meshing with the worm gear to drive the movable nut to move up and down.

8. The threshing drum with adjustable threshing diameter according to claim 1, Features: The invention also comprises a controller and a displacement sensor. The displacement sensor is mounted on the front support disc (101), the middle support disc (102, 103) or the rear support disc (104) and is used to detect the distance moved by the threshing gear rod (105). The displacement sensor is connected to the controller for communication. The controller is also connected to the electric push rod (407), the tooth clutch (305) and the motor (307). The controller controls the operation of the electric push rod (407), the tooth clutch (305) and the motor (307) according to the distance moved by the threshing gear rod (105) detected by the displacement sensor, so as to start and stop the adjustment of the threshing gear rod (105).

9. The threshing drum with adjustable threshing diameter according to claim 3, Features: The front support width disc (101), the middle support width discs (102, 103) and the rear support width disc (104) are all provided with radially arranged I-shaped guide rails (108), the gear rod connecting rod (106) is slidably mounted in the I-shaped guide rails (108), the threshing gear rod (105) is fixed to the end of the gear rod connecting rod (106), and the movable nut (209) meshed with the upper end of the trapezoidal lead screw (210) is fixed to the gear rod connecting rod (106).

10. A combine harvester, It is characterized in that A threshing drum with adjustable threshing diameter is provided.

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