A crawler-type tea garden tillage machine

Abstract

The present invention discloses a crawler-type tea garden tiller, comprising a traveling chassis, a power unit, a primary gearbox, a secondary gearbox, and a tilling device, wherein the traveling chassis, the primary gearbox, and the secondary gearbox are all mounted on a frame, the power unit is mounted on the primary gearbox, the primary gearbox and the secondary gearbox are connected to a transmission sprocket assembly via a connecting device, the tilling device is mounted on the secondary gearbox, a transmission mechanism is provided in the secondary gearbox, the transmission mechanism includes an input assembly and an output assembly, the output assembly is connected to the tilling device, the primary gearbox includes a front housing and a rear housing, a front transmission mechanism and a rear transmission mechanism are respectively provided in the front housing and the rear housing, the front transmission mechanism is connected to the power unit and is connected to the transmission mechanism of the secondary gearbox via a transmission sprocket assembly, and the rear transmission mechanism is connected to the traveling chassis. The present invention has the advantages of easy operation, stable travel, and good performance.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural machinery, in particular to a crawler-type tea garden tillage machine. Background Art

[0002] In tea plantation agricultural production, the use and performance of automated machinery is crucial to economic success. Different types of equipment are required depending on terrain, season, and tillage requirements. Existing tillage equipment is unstable on sloping terrain, and the tillage mechanism lacks adjustability and flexibility, hindering operational effectiveness. Summary of the Invention

[0003] In order to solve the deficiencies of the prior art, the present invention provides a crawler-type tea garden tiller which has the advantages of easy operation, stable travel and good performance.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] A crawler tea garden tillage machine comprises a walking chassis, a power unit, a primary gearbox, a secondary gearbox and a tillage device, wherein the walking chassis, the primary gearbox and the secondary gearbox are all mounted on a frame, the power unit is mounted on the primary gearbox, the primary gearbox and the secondary gearbox are connected to the transmission sprocket assembly through a connecting device, the tillage device is mounted on the secondary gearbox, a transmission mechanism is arranged in the secondary gearbox, the transmission mechanism comprises an input assembly and an output assembly, the output assembly is connected to the tillage device to provide power for the tillage device, the primary gearbox comprises a front box body and a rear box body, a front transmission mechanism and a rear transmission mechanism are respectively arranged in the front box body and the rear box body, the front transmission mechanism is connected to the power unit, and is powered by the power unit through the power transmission mechanism, and is connected to the transmission mechanism of the secondary gearbox through the transmission sprocket assembly to provide power for the secondary gearbox, the rear transmission mechanism is connected to the walking chassis, and provides power to the walking chassis through the driving mechanism.

[0006] Preferably, the tillage device includes a tillage assembly respectively installed at both ends of the secondary gearbox, the tillage assembly includes a driving arm, a connecting rod, a tillage arm and a tillage tooth, one end of the driving arm is key-connected to the output shaft mounting portion of the secondary gearbox, one end of the connecting rod is hingedly set on the box body of the secondary gearbox, the other end of the driving arm and the other end of the connecting rod are rotatably connected to the same tillage arm through a bearing, a tillage tooth mounting portion is provided on the tillage arm close to the driving arm, and the tillage tooth is detachably arranged on the tillage tooth mounting portion, the driving arm receives the power output of the secondary gearbox and forms a crank-connecting rod mechanism with the connecting rod and the tillage arm to drive the tillage tooth operation.

[0007] Preferably, the walking chassis includes a crawler track, a tensioning wheel and a driving wheel, the crawler track is annularly installed on the outside of the chassis frame, the tensioning wheel and the driving wheel are located inwardly of the crawler track and are arranged on the front and rear sides of the chassis frame, a tensioning mechanism is provided between the tensioning wheel and the chassis frame, an upper supporting wheel group is installed between the chassis frame and the upper crawler track, and a lower supporting wheel group is installed between the chassis frame and the lower crawler track, one walking chassis is provided on each side of the frame, and a left and right lateral movement mechanism is installed between the walking chassis and the frame.

[0008] Furthermore, the tensioning mechanism includes a sleeve seat, a sleeve and an adjusting rod. The sleeve seat is detachably fixed to the chassis frame. The sleeve is installed on the sleeve seat. The sleeve is threadedly connected to the adjusting rod. The end of the adjusting rod is connected to the tensioning wheel. The track tensioning force is adjusted by rotating the adjusting rod to change the position of the tensioning wheel.

[0009] Preferably, the connecting device is a telescopic connecting rod, which is connected to the connecting device power mechanism. The connecting device power mechanism is hingedly set on the box body of the first-stage gearbox. The connecting device power mechanism adopts a high-power cylinder or oil cylinder, and the rotatable adjustment of the second-stage gearbox is realized through the telescopic connecting rod.

[0010] Preferably, the transmission sprocket assembly includes a first transmission sprocket, a transmission chain and a second transmission sprocket. The first transmission sprocket is installed on the power output shaft of the first gearbox, and the second transmission sprocket is installed on the power input shaft of the second gearbox. The first transmission sprocket drives the second transmission sprocket to rotate through the transmission chain, thereby driving the power input shaft of the second gearbox to rotate.

[0011] Preferably, the transmission mechanism of the secondary gearbox includes a secondary input component, a first transmission component and a secondary output component, the secondary input component includes an integrally installed power input shaft and a power input gear, the first transmission component includes an integrally installed first transmission shaft and a transmission gear, the secondary output component includes an integrally installed power output shaft and a power output gear, both ends of the power output shaft extend outward and are provided with a power output shaft mounting portion, a tillage device is installed on the secondary output shaft mounting portion, the secondary input shaft, the first transmission shaft and the secondary output shaft are all rotatably mounted on the housing of the secondary gearbox through bearings, the secondary input gear, the first transmission gear and the secondary output gear are engaged in sequence to realize transmission, thereby driving the power output shaft mounting portion to rotate, and then driving the crank-connecting rod mechanism of the tillage device to realize tillage operation.

[0012] Preferably, the front transmission mechanism of the first-stage gearbox includes at least one power input assembly and several front transmission assemblies, the power input assembly includes an integrally installed power input shaft and a power input gear, the front transmission assembly includes an integrally installed front drive shaft and a front drive gear, the power input assembly and each front transmission assembly realize transmission through gear matching, at least one front transmission assembly is also an output assembly, the front drive shaft of the front drive assembly extends out of the box body to constitute the power output shaft of the first-stage gearbox, the rear transmission mechanism of the first-stage gearbox is a variable-speed transmission mechanism, the rear transmission mechanism includes a first rear transmission assembly, a second rear transmission assembly, and a third rear transmission assembly, wherein the first rear transmission assembly is a speed adjustment assembly, and a speed adjustment device is installed on the box body above the first rear transmission assembly, and the rear drive shaft of the third rear transmission assembly extends outward and is connected to the walking chassis through a driving mechanism.

[0013] Preferably, the first rear transmission assembly includes a first rear transmission shaft, a first rear transmission gear is arranged in the middle of the first rear transmission shaft, the first rear transmission gear is key-connected to the first rear transmission shaft, a speed change gear assembly is arranged on each side of the first rear transmission gear, a speed change adjustment device is arranged on the rear box body above the speed change gear assembly, both ends of the first rear transmission shaft are mounted on the rear box body through the first rear mounting bearing, the speed change gear assembly includes an integrally mounted inner speed change gear, an intermediate connecting portion and an outer speed change gear, the speed change adjustment device drives the shift fork to move horizontally left and right through the speed change adjustment rod, and the bottom of the shift fork is embedded in the recessed portion of the intermediate connecting portion The inner speed gear and the outer speed gear are both rotatably mounted on the first rear transmission shaft through bearings. At the same time, the inner speed gear and the inner bearing, the outer speed gear and the inner bearing are all restricted from left and right movement by a sleeve or a step provided on the first rear transmission shaft. The intermediate connecting portion is key-connected with the first rear transmission shaft and can be inserted into the outer speed gear or the inner speed gear along the sliding of the first rear transmission shaft. When the intermediate connecting portion is inserted into the outer speed gear, the outer speed gear is driven to rotate under the drive of the first rear transmission shaft. When the intermediate connecting portion is inserted into the inner speed gear, the inner speed gear is driven to rotate under the drive of the first rear transmission shaft.

[0014] The second rear transmission assembly includes a second rear transmission shaft, which is divided into two left and right sections and is connected in the middle of the left and right sections by a second rear connecting member. Both ends of the second rear transmission shaft are mounted on the rear box body through second rear mounting bearings. A second rear transmission gear assembly is provided on each side of the second rear connecting member. The second rear transmission gear assembly includes a second rear transmission internal gear and a second rear transmission external gear. The second rear transmission internal gear and the second rear transmission external gear are both key-connected to the second rear transmission shaft. The second rear transmission internal gear is provided near the second rear connecting member, and the second rear transmission external gear is provided near the second rear mounting bearing. When the second rear transmission shaft rotates, the second rear transmission internal gear and the second rear transmission external gear are driven to move synchronously.

[0015] The third rear transmission assembly includes a third rear transmission shaft, which is divided into two left and right sections and is connected in the middle of the left and right sections by a third rear connecting piece. Both ends of the third rear transmission shaft are mounted on the rear box body through third rear mounting bearings. A third rear transmission gear assembly is provided on each side of the third rear connecting piece. The third rear transmission gear assembly includes an integrally mounted third rear transmission internal gear and a third rear transmission external gear. The third rear transmission internal gear and the third rear transmission external gear are both key-connected to the third rear transmission shaft. The third rear transmission internal gear and the second rear transmission external gear are both arranged near the third rear mounting bearing. When the third rear transmission shaft rotates, the third rear transmission internal gear and the third rear transmission external gear are driven to move synchronously. A fixed seat is provided in the rear box body, and the second rear connecting piece and the third rear connecting piece are both mounted on the fixed seat.

[0016] Preferably, the speed adjustment device includes a gearbox and an intermediate limit block installed on the top plate of the rear box body. There are two gearboxes and they are symmetrically installed on both sides of the intermediate limit block. A speed adjustment rod is movably installed in the two gearboxes. A shift fork is fixed to the middle of the speed adjustment rod by a bolt assembly. The bottom of the shift fork is embedded in the intermediate connecting part of the speed gear assembly. A positioning groove is provided on the speed adjustment rod. A positioning assembly for use with the positioning groove is installed on the gearbox above the positioning groove. The positioning assembly includes an integrally installed positioning bolt, a spring and a steel ball. A connecting rod transmission mechanism is installed at the outer end of the speed adjustment rod. When the speed adjustment rod is driven to move left and right on the gearbox by the connecting rod transmission mechanism, the speed adjustment rod drives the fixed shift fork to push the speed gear assembly on the first rear transmission shaft to move synchronously, and the speed adjustment rod is fixed in position at the positioning groove by the positioning assembly.

[0017] The beneficial effects of the present invention are:

[0018] 1. It adopts a two-stage transmission gearbox. The first-stage gearbox provides power to the traveling device and the second-stage gearbox respectively. The second-stage gearbox provides power to the tillage device. The tillage device drives the tillage teeth to operate through the crank-connecting rod mechanism. It is easy to use, can be flexibly adjusted, and has better applicability.

[0019] 2. By changing the installation position of the secondary gearbox on the agricultural machinery body, the position of the secondary gearbox can be adjusted through the connecting device, and the installation position of the transmission sprocket assembly can be adjusted as needed. The structure is compact, the adjustment is flexible, and the operation is convenient;

[0020] 3. It adopts crawler-type walking chassis, and the track tension can be adjusted to better adapt to the unevenness of the ground, making the walking more stable, safe and reliable, and improving the farming effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front view of a crawler-type tea garden tillage machine according to the present invention;

[0022] Figure 2 This is a front view of the two-stage gearbox and tillage device of the present invention;

[0023] Figure 3 This is a front view of the first-stage gearbox of the present invention;

[0024] Figure 4 It is a top cross-sectional view of the first-stage gearbox of the present invention;

[0025] Figure 5 This is a structural diagram of the second rear transmission assembly of the present invention driving the third rear transmission assembly through gears;

[0026] Figure 6 This is a structural diagram of the first rear transmission assembly of the present invention directly driving the third rear transmission assembly through gears;

[0027] Figure 7 This is a schematic structural diagram of the speed adjustment device above the first rear transmission assembly of the present invention;

[0028] Figure 8 This is a structural diagram of the walking chassis of the present invention;

[0029] In the figure: 1-first stage gearbox, 10-front box body, 11-rear box body, 110-fixed seat, 12-front transmission mechanism, 121-power input assembly, 122-first front transmission assembly, 123-second front transmission assembly, 124-first output assembly, 125-third front transmission assembly, 126-fourth front transmission assembly, 127-fifth front transmission assembly;

[0030] 13-first rear drive shaft, 130-first rear mounting bearing, 131-first rear drive gear, 14-second rear drive shaft, 140-second rear mounting bearing, 141-second rear connecting member, 15-third rear drive shaft, 150-third rear mounting bearing, 151-third rear connecting member, 16-speed gear assembly, 161-inner speed gear, 162-intermediate connecting portion, 163-outer speed gear, 17-second rear drive gear assembly, 171-second rear drive internal gear, 172-second rear drive external gear, 18-third rear drive gear assembly, 181-third rear drive internal gear, 182-third rear drive external gear;

[0031] 2-secondary gearbox, 20-connecting device, 21-drive sprocket assembly, 22-secondary input assembly, 23-first transmission assembly, 24-secondary output assembly, 3-tillage device, 31-drive arm, 32-tillage arm, 320-tillage teeth, 33-connecting rod;

[0032] 4-speed adjustment device, 40-rear box top plate, 41-gearbox, 42-speed adjustment rod, 43-shift fork, 44-positioning groove, 45-positioning assembly, 46-intermediate limit block, 5-power unit, 6-power transmission mechanism;

[0033] 7-walking chassis, 70-chassis frame, 71-track, 72-driving wheel, 73-tensioning wheel, 74-tensioning mechanism, 740-sleeve seat, 741-sleeve, 742-adjusting rod, 75-lower supporting wheel group, 76-upper supporting wheel group. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings and examples.

[0035] like Figure 1-8 As shown, the crawler type tea garden tiller provided by the present invention includes a walking chassis 7, a power unit 5, a primary gearbox 1, a secondary gearbox 2 and a tillage device 3. The walking chassis 7, the primary gearbox 1 and the secondary gearbox 2 are all mounted on a frame, the power unit 5 is mounted on the primary gearbox 1, the primary gearbox 1 and the secondary gearbox 2 are connected to the transmission sprocket assembly 21 through a connecting device 20, the tillage device 3 is mounted on the secondary gearbox 2, and a transmission mechanism is set in the secondary gearbox 2, and the transmission mechanism includes an input assembly and an output assembly. The output assembly is connected to the tillage device 3 to provide power for the tillage device 3. The first-stage gearbox 1 includes a front box body 10 and a rear box body 11. A front transmission mechanism 12 and a rear transmission mechanism are respectively arranged in the front box body 10 and the rear box body 11. The front transmission mechanism 12 is connected to the power device 5, and is powered by the power device 5 through the power transmission mechanism 6. It is also connected to the transmission mechanism of the second-stage gearbox 2 through the transmission sprocket assembly 21 to provide power for the second-stage gearbox 2. The rear transmission mechanism is connected to the walking chassis 7 to provide power for the walking chassis 7 through the driving mechanism.

[0036] Specifically, the tillage device 3 includes a tillage assembly respectively installed at both ends of the secondary gearbox 2, and the tillage assembly includes a driving arm 31, a connecting rod 33, a tillage arm 32 and a tillage tooth 320. One end of the driving arm 31 is keyed to the output shaft mounting portion of the secondary gearbox 2, and one end of the connecting rod 33 is hingedly set on the box body of the secondary gearbox 2. The other end of the driving arm 31 and the other end of the connecting rod 33 are rotatably connected to the same tillage arm 32 through a bearing. A tillage tooth 320 mounting portion is provided on the tillage arm 32 close to the driving arm 31, and the tillage tooth 320 is detachably set on the tillage tooth 320 mounting portion. The driving arm 31 receives the power output of the secondary gearbox 2 and forms a crank-connecting rod mechanism with the connecting rod 33 and the tillage arm 32 to drive the tillage tooth 320 to operate.

[0037] Specifically, the walking chassis 7 includes a crawler track 71, a tensioning wheel 73 and a driving wheel 72. The crawler track 71 is annularly installed on the outside of the chassis frame 70. The tensioning wheel 73 and the driving wheel 72 are located in the crawler track 71 and are arranged on the front and rear sides of the chassis frame 70. A tensioning mechanism 74 is provided between the tensioning wheel 73 and the chassis frame 70. An upper supporting wheel group 76 is installed between the chassis frame 70 and the upper crawler track 71, and a lower supporting wheel group 75 is installed between the chassis frame 70 and the lower crawler track 71. The mechanism 74 includes a sleeve seat 740, a sleeve 741 and an adjusting rod 742. The sleeve seat 740 is detachably fixed to the chassis frame 70. The sleeve 741 is installed on the sleeve seat 740. The sleeve 741 is threadedly connected to the adjusting rod 742. The end of the adjusting rod 742 is connected to the tensioning wheel 73. The position of the tensioning wheel 73 is changed by rotating the adjusting rod 742 to adjust the tensioning force of the track 71. The walking chassis 7 is provided on each side of the frame, and a left and right transverse movement mechanism is installed between the walking chassis 7 and the frame.

[0038] Specifically, the left and right lateral movement mechanism is capable of realizing the synchronous deflection of the two walking chassis 7 to the left or right, and can be driven by a cylinder and a piston rod or a high-power motor through a gear rack. For example, a cylinder is set on the bottom surface of the frame, and the piston rod of the cylinder is connected to the steering rod. The steering rod pulls the steering knuckle (fixedly connected to the walking chassis 7), and the steering knuckle drives the walking chassis 7 to rotate, thereby realizing the movement of the walking chassis 7 to the left or right on the chassis frame 70, thereby realizing the steering function, or mutually cooperating power gears and transmission racks are horizontally installed on the front and rear sides of the frame, the power gear is driven by a high-power motor to realize rotation, and the transmission rack is horizontally movably arranged on the frame, and the transmission rack is connected to the walking chassis 9 at both ends through a connecting component. By controlling the forward or reverse rotation of the motor, the transmission rack is driven to move horizontally left and right, thereby making the front and rear sides of the two walking chassis 9 move synchronously to the left or right.

[0039] Specifically, the connecting device 20 is a telescopic connecting rod, which is connected to the connecting device power mechanism. The connecting device power mechanism is hingedly set on the box body of the first-stage gearbox 1. The connecting device power mechanism adopts a high-power cylinder or oil cylinder, and the rotatable adjustment of the second-stage gearbox 2 is realized through the telescopic connecting rod.

[0040] Specifically, the transmission sprocket assembly 21 includes a first transmission sprocket, a transmission chain and a second transmission sprocket. The first transmission sprocket is installed on the power output shaft of the first gearbox 1, and the second transmission sprocket is installed on the power input shaft of the second gearbox 2. The first transmission sprocket drives the second transmission sprocket to rotate through the transmission chain, thereby driving the power input shaft of the second gearbox 2 to rotate.

[0041] Specifically, the transmission mechanism of the secondary gearbox 2 includes a secondary input component 22, a first transmission component 23 and a secondary output component 24. The secondary input component 22 includes an integrally installed power input shaft and a power input gear. The first transmission component 23 includes an integrally installed first transmission shaft and a transmission gear. The secondary output component 24 includes an integrally installed power output shaft and a power output gear. Both ends of the power output shaft extend outward and are provided with a power output shaft mounting portion. The secondary output shaft mounting portion is provided with a tillage device 3. The secondary input shaft, the first transmission shaft and the secondary output shaft are all rotatably mounted on the housing of the secondary gearbox 2 through bearings. The secondary input gear, the first transmission gear and the secondary output gear are engaged in sequence to realize transmission, thereby driving the power output shaft mounting portion to rotate, and then driving the crank-connecting rod mechanism of the tillage device 3 to realize the operation of the tillage teeth 320.

[0042] Specifically, the front transmission mechanism 12 of the first-stage gearbox 1 includes at least one power input assembly 121 and several front transmission assemblies, the power input assembly 121 includes an integrally installed power input shaft and a power input gear, the front transmission assembly includes an integrally installed front transmission shaft and a front transmission gear, the power input assembly 121 and each front transmission assembly realize transmission through gear matching, at least one front transmission assembly is also an output assembly, the front transmission shaft of the front transmission assembly extends out of the box body to constitute the power output shaft of the first-stage gearbox 1, the rear transmission mechanism of the first-stage gearbox 1 is a variable-speed transmission mechanism, the rear transmission mechanism includes a first rear transmission assembly, a second rear transmission assembly, and a third rear transmission assembly, wherein the first rear transmission assembly is a speed adjustment assembly, and a speed adjustment device 4 is installed on the box body above the first rear transmission assembly, and the rear transmission shaft of the third rear transmission assembly extends outward and is connected to the walking chassis 7 through a driving mechanism. In this embodiment, five front transmission assemblies and a first output assembly 124 are included. The five front transmission assemblies are a first front transmission assembly 122, a second front transmission assembly 123, a third front transmission assembly 125, a fourth front transmission assembly 126, and a fifth front transmission assembly 127. The first output assembly 124 has the same basic structure as the front transmission assembly, that is, the first output assembly 124 is also a front transmission assembly.

[0043] Furthermore, the first rear transmission assembly includes a first rear transmission shaft 13, a first rear transmission gear 131 is provided in the middle of the first rear transmission shaft 13, the first rear transmission gear 131 is key-connected to the first rear transmission shaft 13, a speed change gear assembly 16 is provided on each side of the first rear transmission gear 131, a speed change adjustment device 4 is provided on the rear housing 11 above the speed change gear assembly 16, and both ends of the first rear transmission shaft 13 are mounted on the rear housing 11 through a first rear mounting bearing 130, the speed change gear assembly 16 includes an integrally mounted inner speed change gear 161, an intermediate connecting portion 162 and an outer speed change gear 163, the speed change adjustment device 4 drives the shift fork 43 to move horizontally left and right through the speed change adjustment rod 42, and the bottom of the shift fork 43 is embedded in the recessed groove of the intermediate connecting portion 162 In the groove, the inner speed gear 161 and the outer speed gear 163 are both rotatably mounted on the first rear transmission shaft 13 through bearings. At the same time, the inner speed gear 161 and the inner bearing, the outer speed gear 163 and the inner bearing are restricted from left and right movement by a sleeve or step provided on the first rear transmission shaft 13. The intermediate connecting portion 162 is key-connected with the first rear transmission shaft 13 and can be embedded in the outer speed gear 163 or embedded in the inner speed gear 161 along the sliding of the first rear transmission shaft 13. When the intermediate connecting portion 162 is embedded in the outer speed gear 163, the outer speed gear 163 is driven to rotate under the drive of the first rear transmission shaft 13. When the intermediate connecting portion 162 is embedded in the inner speed gear 161, the inner speed gear 161 is driven to rotate under the drive of the first rear transmission shaft 13.

[0044] The second rear transmission assembly includes a second rear transmission shaft 14, which is divided into two left and right sections and is connected in the middle of the left and right sections by a second rear connecting member 141. Both ends of the second rear transmission shaft 14 are mounted on the rear box body 11 through second rear mounting bearings 140. A second rear transmission gear assembly 17 is provided on each side of the second rear connecting member 141. The second rear transmission gear assembly 17 includes a second rear transmission internal gear 171 and a second rear transmission external gear 172. The second rear transmission internal gear 171 and the second rear transmission external gear 172 are both key-connected to the second rear transmission shaft 14. The second rear transmission internal gear 171 is provided near the second rear connecting member 141, and the second rear transmission external gear 172 is provided near the second rear mounting bearing 140. When the second rear transmission shaft 14 rotates, the second rear transmission internal gear 171 and the second rear transmission external gear 172 are driven to move synchronously.

[0045] The third rear transmission assembly includes a third rear transmission shaft 15, which is divided into two left and right sections and is connected in the middle of the left and right sections by a third rear connecting member 151. Both ends of the third rear transmission shaft 15 are mounted on the rear box body 11 through third rear mounting bearings 150. A third rear transmission gear assembly 18 is provided on each side of the third rear connecting member 151. The third rear transmission gear assembly 18 includes an integrally mounted third rear transmission internal gear 181 and a third rear transmission external gear 182. The third rear transmission internal gear 181 and the third rear transmission external gear 182 are both key-connected to the third rear transmission shaft 15. The third rear transmission internal gear 181 and the second rear transmission external gear 172 are both arranged near the third rear mounting bearing 150. When the third rear transmission shaft 15 rotates, the third rear transmission internal gear 181 and the third rear transmission external gear 182 are driven to move synchronously. A fixing seat 110 is provided in the rear box body 11, and the second rear connecting member 141 and the third rear connecting member 151 are both mounted on the fixing seat 110.

[0046] Specifically, the speed adjustment device 4 includes a gearbox 41 installed on the top plate 40 of the rear box body and an intermediate limit block 46. There are two gearboxes 41 and they are symmetrically installed on both sides of the intermediate limit block 46. A speed adjustment rod 42 is movably installed in the two gearboxes 41. A shift fork 43 is fixed to the middle of the speed adjustment rod 42 by a bolt assembly. The bottom of the shift fork 43 is embedded in the intermediate connecting portion 162 of the speed gear assembly 16. A positioning groove 44 is provided on the speed adjustment rod 42. A positioning groove 44 is installed on the gearbox 41 above the positioning groove 44. The positioning groove 44 cooperates with the positioning assembly 45, which includes an integrally installed positioning bolt, a spring and a steel ball. The outer end of the speed adjustment rod 42 is installed with a connecting rod 33 transmission mechanism. When the speed adjustment rod 42 is driven to move left and right on the gearbox 41 by the connecting rod 33 transmission mechanism, the speed adjustment rod 42 drives the fixed shift fork 43 to push the speed change gear assembly 16 on the first rear transmission shaft 13 to move synchronously, and the speed adjustment rod 42 is fixed in the positioning groove 44 by the positioning assembly 45. This process includes:

[0047] (1) The intermediate connecting portion 162 is embedded in the inner speed gear 161: the first rear transmission shaft 13 drives the inner speed gear 161 to rotate. At this time, the intermediate connecting portion 162 is separated from the outer speed gear 163, and the outer speed gear 163 is only movably mounted on the first rear transmission shaft 13 through the bearing, so that when the first rear transmission shaft 13 rotates, it does not drive the outer speed gear 163 to rotate. The inner speed gear 161 drives the second rear transmission internal gear 171 to rotate. The second rear transmission internal gear 171 drives the second rear transmission external gear 172 to rotate through the second rear transmission shaft 14. The second rear transmission external gear 172 drives the third rear transmission external gear 182 to rotate. The third rear transmission external gear 182 drives the third rear transmission shaft 15 to rotate and provides power to the walking device through the driving mechanism.

[0048] (2) The intermediate connecting portion 162 is embedded in the outer speed gear 163: the first rear transmission shaft 13 drives the outer speed gear 163 to rotate. At this time, the intermediate connecting portion 162 is separated from the inner speed gear 161, and the inner speed gear 161 is only movably mounted on the first rear transmission shaft 13 through the bearing, so that when the first rear transmission shaft 13 rotates, it does not drive the inner speed gear 161 to rotate. The outer speed gear 163 drives the third rear transmission internal gear 181 to rotate, and the third rear transmission internal gear 181 drives the third rear transmission shaft 15 to rotate and provides power to the walking device through the driving mechanism.

[0049] Therefore, the forward and backward movement conversion of the traveling device can be realized through the above-mentioned speed change adjustment device 4, and finally the driving mechanism provides power to the traveling chassis 7.

[0050] It should be noted that the above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Equivalent modifications made based on the above embodiments fall within the scope of protection of the present invention.

Claims

1. A crawler-type tea garden tiller, comprising a traveling chassis, a power unit, a primary gearbox, a secondary gearbox, and a tilling device, characterized in that: The walking chassis, the primary gearbox, and the secondary gearbox are all mounted on the frame, the power unit is mounted on the primary gearbox, the primary gearbox and the secondary gearbox are connected to the transmission sprocket assembly through a connecting device, the tillage device is mounted on the secondary gearbox, a transmission mechanism is provided in the secondary gearbox, the transmission mechanism includes an input assembly and an output assembly, the output assembly is connected to the tillage device, the primary gearbox includes a front box body and a rear box body, a front transmission mechanism and a rear transmission mechanism are respectively provided in the front box body and the rear box body, the front transmission mechanism is connected to the power unit and is connected to the transmission mechanism of the secondary gearbox through the transmission sprocket assembly, and the rear transmission mechanism is connected to the walking chassis; The walking chassis includes a crawler track, a tensioning wheel and a driving wheel. The crawler track is annularly installed on the outside of the chassis frame. The tensioning wheel and the driving wheel are located in the crawler track and are arranged on the front and rear sides of the chassis frame. A tensioning mechanism is provided between the tensioning wheel and the chassis frame. An upper supporting wheel group is installed between the chassis frame and the upper crawler track, and a lower supporting wheel group is installed between the chassis frame and the lower crawler track. One walking chassis is provided on each side of the frame, and a left and right traverse mechanism is installed between the walking chassis and the frame. The tensioning mechanism includes a sleeve seat, a sleeve and an adjusting rod. The sleeve seat is detachably fixed to the chassis frame. The sleeve is mounted on the sleeve seat. The sleeve is threadedly connected to the adjusting rod. The end of the adjusting rod is connected to the tensioning wheel. The track tension is adjusted by rotating the adjusting rod to change the position of the tensioning wheel. The connecting device is a retractable connecting rod, which is connected to a connecting device power mechanism. The connecting device power mechanism is hingedly arranged on the housing of the primary gearbox. The connecting device power mechanism adopts a high-power cylinder or oil cylinder, and realizes the rotatable adjustment of the secondary gearbox through the retractable connecting rod. The transmission mechanism of the secondary gearbox includes a secondary input assembly, a first transmission assembly and a secondary output assembly, the secondary input assembly includes an integrally installed power input shaft and a power input gear, the first transmission assembly includes an integrally installed first transmission shaft and a transmission gear, the secondary output assembly includes an integrally installed power output shaft and a power output gear, both ends of the power output shaft extend outward and are provided with a power output shaft mounting portion, a tillage device is installed on the secondary output shaft mounting portion, the secondary input shaft, the first transmission shaft and the secondary output shaft are all rotatably mounted on the housing of the secondary gearbox through bearings, the secondary input gear, the first transmission gear and the secondary output gear are engaged in sequence to realize transmission, thereby driving the power output shaft mounting portion to rotate, and then driving the crank-connecting rod mechanism of the tillage device to realize tillage operation.

2. The crawler-type tea garden tiller according to claim 1, characterized in that: The tillage device includes a tillage assembly respectively installed at both ends of the secondary gearbox, and the tillage assembly includes a driving arm, a connecting rod, a tillage arm and a tillage tooth. One end of the driving arm is key-connected to the output shaft mounting portion of the secondary gearbox, and one end of the connecting rod is hingedly arranged on the box body of the secondary gearbox. The other end of the driving arm and the other end of the connecting rod are rotatably connected to the same tillage arm through a bearing. A tillage tooth mounting portion is provided on the tillage arm close to the driving arm, and the tillage tooth is detachably arranged on the tillage tooth mounting portion. The driving arm receives the power output of the secondary gearbox and forms a crank-connecting rod mechanism with the connecting rod and the tillage arm to drive the tillage tooth operation.

3. The crawler-type tea garden tiller according to claim 1, characterized in that: The transmission sprocket assembly includes a first transmission sprocket, a transmission chain and a second transmission sprocket. The first transmission sprocket is installed on the power output shaft of the first gearbox, and the second transmission sprocket is installed on the power input shaft of the second gearbox. The first transmission sprocket drives the second transmission sprocket to rotate through the transmission chain, thereby driving the power input shaft of the second gearbox to rotate.

4. The crawler-type tea garden tiller according to claim 1, characterized in that: The front transmission mechanism of the first-stage gearbox includes at least one power input assembly and several front transmission assemblies, the power input assembly includes an integrally installed power input shaft and a power input gear, the front transmission assembly includes an integrally installed front drive shaft and a front drive gear, the power input assembly and each front transmission assembly realize transmission through gear matching, at least one front transmission assembly is also an output assembly, the front drive shaft of the front drive assembly extends out of the box body to constitute the power output shaft of the first-stage gearbox, the rear transmission mechanism of the first-stage gearbox is a variable-speed transmission mechanism, the rear transmission mechanism includes a first rear transmission assembly, a second rear transmission assembly, and a third rear transmission assembly, wherein the first rear transmission assembly is a speed adjustment assembly, and a speed adjustment device is installed on the box body above the first rear transmission assembly, and the rear drive shaft of the third rear transmission assembly extends outward and is connected to the walking chassis through a driving mechanism.

5. The crawler-type tea garden tiller according to claim 4, characterized in that: The first rear transmission assembly includes a first rear transmission shaft, a first rear transmission gear is arranged in the middle of the first rear transmission shaft, the first rear transmission gear is key-connected to the first rear transmission shaft, a speed change gear assembly is arranged on each side of the first rear transmission gear, a speed change adjustment device is arranged on the rear housing above the speed change gear assembly, both ends of the first rear transmission shaft are mounted on the rear housing through first rear mounting bearings, the speed change gear assembly includes an integrally mounted inner speed change gear, an intermediate connecting portion and an outer speed change gear, the speed change adjustment device drives the shift fork to move horizontally left and right through the speed change adjustment rod, and the bottom of the shift fork is embedded in the groove of the intermediate connecting portion The inner speed gear and the outer speed gear are both rotatably mounted on the first rear transmission shaft through bearings. At the same time, the inner speed gear and the inner bearing, the outer speed gear and the inner bearing are all restricted from left and right movement by a sleeve or a step provided on the first rear transmission shaft. The intermediate connecting portion is key-connected with the first rear transmission shaft and can be inserted into the outer speed gear or the inner speed gear along the sliding of the first rear transmission shaft. When the intermediate connecting portion is inserted into the outer speed gear, the outer speed gear is driven to rotate under the drive of the first rear transmission shaft. When the intermediate connecting portion is inserted into the inner speed gear, the inner speed gear is driven to rotate under the drive of the first rear transmission shaft. The second rear transmission assembly includes a second rear transmission shaft, which is divided into two left and right sections and is connected in the middle of the left and right sections by a second rear connecting member. Both ends of the second rear transmission shaft are mounted on the rear box body through second rear mounting bearings. A second rear transmission gear assembly is provided on each side of the second rear connecting member. The second rear transmission gear assembly includes a second rear transmission internal gear and a second rear transmission external gear. The second rear transmission internal gear and the second rear transmission external gear are both key-connected to the second rear transmission shaft. The second rear transmission internal gear is provided near the second rear connecting member, and the second rear transmission external gear is provided near the second rear mounting bearing. When the second rear transmission shaft rotates, the second rear transmission internal gear and the second rear transmission external gear are driven to move synchronously. The third rear transmission assembly includes a third rear transmission shaft, which is divided into two left and right sections and is connected in the middle of the left and right sections by a third rear connecting piece. Both ends of the third rear transmission shaft are mounted on the rear box body through third rear mounting bearings. A third rear transmission gear assembly is provided on each side of the third rear connecting piece. The third rear transmission gear assembly includes an integrally mounted third rear transmission internal gear and a third rear transmission external gear. The third rear transmission internal gear and the third rear transmission external gear are both key-connected to the third rear transmission shaft. The third rear transmission internal gear and the second rear transmission external gear are both arranged near the third rear mounting bearing. When the third rear transmission shaft rotates, the third rear transmission internal gear and the third rear transmission external gear are driven to move synchronously. A fixed seat is provided in the rear box body, and the second rear connecting piece and the third rear connecting piece are both mounted on the fixed seat.

6. The crawler-type tea garden tiller according to claim 5, characterized in that: The speed adjustment device includes a gearbox and an intermediate limit block installed on the top plate of the rear box body. There are two gearboxes and they are symmetrically installed on both sides of the intermediate limit block. A speed adjustment rod is movably installed in the two gearboxes. A shift fork is fixed to the middle part of the speed adjustment rod by a bolt assembly. The bottom of the shift fork is embedded in the intermediate connecting part of the speed gear assembly. A positioning groove is provided on the speed adjustment rod. A positioning assembly used in conjunction with the positioning groove is installed on the gearbox above the positioning groove. The positioning assembly includes an integrally installed positioning bolt, a spring and a steel ball. A connecting rod transmission mechanism is installed at the outer end of the speed adjustment rod. When the speed adjustment rod is driven to move left and right on the gearbox by the connecting rod transmission mechanism, the speed adjustment rod drives the fixed shift fork to push the speed gear assembly on the first rear transmission shaft to move synchronously, and the speed adjustment rod is fixed in position at the positioning groove by the positioning assembly.

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