A combine harvester with a lock

Abstract

The application discloses a combine harvester with a lock, and belongs to the field of agricultural machinery. The combine harvester with the lock comprises a harvester, a cab and a threshing part, and further comprises a conveying groove, one end of the conveying groove being connected with the harvester, and the other end of the conveying groove being connected with the threshing part; a clutch assembly, the clutch assembly comprising a forward rotation clutch mechanism and a reverse rotation clutch mechanism, the forward rotation clutch mechanism and the reverse rotation clutch mechanism being arranged in the conveying groove; and a lock, the lock comprising a locking support and a return spring, one end of the return spring abutting against the locking support, the return spring limiting the locking support, one end of the locking support abutting against the forward rotation clutch mechanism, and the other end of the locking support abutting against the reverse rotation clutch mechanism. The handle of the reverse rotation clutch mechanism and the handle of the forward rotation clutch are arranged in the cab through a cable, and the lock arranged below the clutch assembly can effectively prevent damage to the machine caused by incorrect operation of the machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of agricultural machinery, more particularly to a combine harvester with a lock. BACKGROUND

[0002] China is a large agricultural country, and the social economy has high requirements for the harvesting quality and efficiency in grain production. At present, combine harvesters have gradually been popularized in agricultural production in China. As a kind of complex agricultural field operation machinery widely used in crop harvesting, it can complete the cutting, conveying, threshing, separating, cleaning and collecting of the harvested crops at one time, and has the characteristics of high operation efficiency and strong mobility.

[0003] When the combine harvester is working, sometimes the conveying groove of the combine harvester will be blocked due to too much feeding because the speed is too fast or the crops are planted too densely. After the conveying groove is blocked, the conveying groove needs to be reversed to spit out the grass and grains that cause the blockage to ensure continuous operation. However, in the prior art, most of the combine harvesters adopt a shaft transmission, that is, the forward shaft and the reverse shaft need to cooperate with each other to realize the forward and reverse switching of the combine harvester, and in actual use, the forward and reverse interference phenomenon is prone to occur.

[0004] Therefore, on the market, there are combine harvesters that realize forward and reverse rotation by single shaft, but the reverse clutch of all cab models is placed outside the cab, which means that when the reverse clutch needs to be used, the side window of the cab needs to be opened to implement the reverse operation. Because the harvesting operation environment is poor and there is a lot of dust, when the side window is opened for reverse operation, the dust will enter the cab and flow in the cab with the air conditioner on, which seriously affects the operation comfort. At the same time, because the same transmission mechanism is used for forward and reverse rotation of the conveying groove, it means that the forward and reverse clutches cannot be used at the same time, and if they are used at the same time, it will cause damage to the transmission parts or burning of the belt.

[0005] Chinese patent application No. CN201920150340.0, application date: January 29, 2019, and invention name: a cutting table anti-blocking reverse system of a spike and stem combined corn harvester, discloses a system including a driving power gear box, a main shaft, a forward bevel gear, a reverse bevel gear, a cutting table shaft, a cutting table bevel gear, a sliding sleeve, a rotating block, a reversing fork, an arc block, a slide, a forward and reverse slide block, a cylinder, and a control shaft.

[0006] The patent adopts a shaft transmission, and the switching between forward and reverse rotation needs to be realized by simultaneously cooperating the forward clutch and the reverse clutch structure, so the phenomenon of mutual interference between forward and reverse rotation occurs, which is easy to cause damage to the combine harvester. SUMMARY

[0007] 1. Technical problems solved by the invention

[0008] The present application aims to overcome the deficiencies in the prior art that require opening the cab side window to perform the reverse operation and cause the belt to burn or the transmission to be damaged due to operator error, and provides a combine harvester with a lock, which sets the handle of the reverse clutch mechanism and the handle of the forward clutch mechanism in the cab through a cable, and effectively prevents damage to the machine due to operator error by setting a lock below the clutch assembly.

[0009] 2. Technical solutions

[0010] To achieve the above-mentioned purpose, the technical solutions provided by the present application are as follows:

[0011] The combine harvester with a lock of the present application comprises a harvester, a cab and a threshing part, further comprising a conveying groove, one end of the conveying groove being connected to the harvester, the other end of the conveying groove being connected to the threshing part; a clutch assembly, the clutch assembly comprising a forward clutch mechanism and a reverse clutch mechanism, the forward clutch mechanism and the reverse clutch mechanism being arranged on one side of the conveying groove, the reverse clutch mechanism comprising a reverse clutch handle, the reverse clutch handle being arranged inside the cab; and a lock, the lock comprising a locking bracket and a return spring, one end of the return spring abutting against the locking bracket, the return spring limiting the locking bracket, one end of the locking bracket abutting against the forward clutch mechanism, the other end of the locking bracket abutting against the reverse clutch mechanism.

[0012] As a further improvement of the present application, the conveying groove comprises a housing, a conveying chain and a transmission mechanism, the conveying chain being arranged inside the housing, the clutch assembly driving the conveying chain through the transmission mechanism.

[0013] As a further improvement of the present application, the transmission mechanism comprises a bevel gear, a forward shaft, a reverse shaft and a chain shaft, one end of the forward shaft and one end of the reverse shaft being engaged with the same bevel gear, the forward shaft being connected to one end of the chain shaft through the forward clutch mechanism, the reverse shaft being connected to the other end of the chain shaft through the reverse clutch mechanism, the conveying chain being driven by the chain shaft.

[0014] As a further improvement of the present application, the forward clutch mechanism comprises a forward clutch, a forward driving pulley, a forward driven pulley and a forward belt, the forward driving pulley and the forward shaft being provided with the forward clutch, the same forward belt being sleeved on the forward driving pulley and the forward driven pulley.

[0015] As a further improvement of the present invention, the reversing clutch mechanism includes a reversing clutch, a reversing drive wheel, a reversing driven wheel, and a reversing belt. A reversing clutch is provided between the reversing drive wheel and the reversing shaft, and the same reversing belt is fitted on the reversing drive wheel and the reversing driven wheel.

[0016] As a further improvement of the present invention, the forward clutch mechanism further includes a forward clutch handle and a forward cable. The forward clutch handle is located in the driver's cab, and the lower end of the forward clutch handle is connected to the forward clutch via the forward cable.

[0017] As a further improvement of the present invention, the reversing clutch mechanism further includes a reversing cable, the lower end of the reversing clutch handle is connected to the reversing clutch via the reversing cable, and the reversing clutch handle and the forward clutch handle are provided with the same locking device below them.

[0018] As a further improvement of the present invention, the locking device further includes a plate, and a pin is provided at the middle position of the locking bracket. The locking device is rotatably connected to the plate via the pin. A return spring is sleeved on the end of the pin away from the plate. One end of the return spring is fixed to the plate, and the other end of the return spring abuts against the locking bracket. A friction block is provided at one end of the locking bracket, and a hook is provided at the other end of the locking bracket. The end of the locking bracket with the friction block contacts the forward clutch handle, and the end of the locking bracket with the hook contacts the reverse clutch handle.

[0019] As a further improvement of the present invention, a first rotating shaft is provided at the lower end of the forward clutch handle, and the forward clutch handle is rotatably connected to the side wall of the plate through the first rotating shaft. A ball head pin is provided below the forward clutch handle, and the ball head pin abuts against the friction block.

[0020] As a further improvement of the present invention, a second rotating shaft is provided at the lower end of the reverse clutch handle, and the reverse clutch handle is rotatably connected to the side wall of the plate through the second rotating shaft. A locking pin is provided below the reverse clutch handle, and the locking pin abuts against the hook.

[0021] 3. Beneficial effects

[0022] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0023] This invention provides a reverse clutch handle connected to a reverse clutch mechanism via a reverse cable within the cab. The operator can pull the reverse clutch handle from inside the cab to reverse the conveyor trough, thus preventing dust from entering the cab when the side window needs to be opened to reverse the conveyor trough.

[0024] The present invention has a locking device below the forward clutch mechanism and the reverse clutch mechanism. The locking device ensures that only one of the forward clutch mechanism and the reverse clutch mechanism can be engaged at the same time, which avoids belt burnout or transmission component damage caused by operator error. At the same time, the present invention has a reasonable structural design, simple principle, low cost, convenient maintenance, stability and reliability, and is easy to promote and use. Attached Figure Description

[0025] Fig. 1 This is a schematic diagram showing the location of the conveyor trough in a harvester;

[0026] Fig. 2 This is a schematic diagram of the clutch assembly and the driver's cab.

[0027] Fig. 3 This is a schematic diagram showing the positions of the clutch assembly and the conveyor chain;

[0028] Fig. 4 This is a schematic diagram showing the positions of the forward and reverse clutch levers;

[0029] Fig. 5 A schematic diagram showing the locking device and the forward and reverse clutch handles;

[0030] Fig. 6 This is a schematic diagram illustrating the process of the clutch lever engaging and disengaging during forward rotation.

[0031] Explanation of the labels in the diagram:

[0032] 100. Conveying trough;

[0033] 101. Outer shell;

[0034] 102. Conveyor chain;

[0035] 103. Transmission mechanism; 103a. Bevel gear; 103b. Forward rotation shaft; 103c. Reverse rotation shaft; 103d. Chain shaft;

[0036] 200. Clutch assembly;

[0037] 201. Forward rotation clutch mechanism; 201a. Forward rotation clutch; 201b. Forward rotation drive wheel; 201c. Forward rotation driven wheel; 201d. Forward rotation belt; 201e. Forward rotation clutch handle; 201e-1. First rotating shaft; 201e-2. Ball head pin; 201f. Forward rotation cable;

[0038] 202, Reverse clutch mechanism; 202a, Reverse clutch; 202b, Reverse drive pulley; 202c, Reverse driven pulley; 202d, Reverse belt; 202e, Reverse clutch handle; 202e-1, Second shaft; 202e-2, Locking pin; 202f, Reverse cable;

[0039] 300, Locking device; 301, Flat plate; 302, Locking bracket; 302a, Friction block; 302b, Hook; 303, Return spring. Detailed Implementation

[0040] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0041] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0042] The present invention will be further described below with reference to embodiments, such as... Figs. 1-6 As shown:

[0043] Combine harvesters are used to harvest rice and wheat. The rice and wheat are cut at the harvester and simultaneously fed from the field into a conveyor trough 100. The conveyor trough 100 connects the harvester to the threshing section, allowing the rice and wheat to pass through and be threshed. During actual operation, the conveyor trough 100 often becomes clogged due to excessive feed caused by high speed or dense crop planting. When clogged, the trough 100 needs to be reversed to expel the clogged material and ensure normal operation.

[0044] The combine harvester with a locking device in this embodiment includes a harvester, a cab, and a threshing section. It also includes a conveying trough 100, a clutch assembly 200, and a locking device 300. One end of the conveying trough 100 is connected to the harvester, and the other end is connected to the threshing section. The clutch assembly 200 includes a forward clutch mechanism 201 and a reverse clutch mechanism 202, both disposed on one side of the conveying trough 100. The reverse clutch mechanism includes a reverse clutch handle disposed inside the cab. The locking device 300 includes a locking bracket 302 and a return spring 303. One end of the return spring 303 abuts against the locking bracket 302, limiting the locking bracket 302. One end of the locking bracket 302 abuts against the forward clutch mechanism 201, and the other end abuts against the reverse clutch mechanism 202.

[0045] The clutch assembly 200 includes a forward clutch mechanism 201 and a reverse clutch mechanism 202. The forward clutch mechanism 201 causes the conveying trough 100 to rotate forward, and the reverse clutch mechanism 202 causes the conveying trough 100 to rotate in reverse. When the grass and grain block the conveying trough 100, activating the reverse clutch mechanism 202 can cause the conveying trough 100 to rotate in reverse and discharge the grass and grain.

[0046] Furthermore, a locking device 300 is provided at the lower end of the clutch assembly 200. The locking device 300 ensures that when one of the forward clutch mechanism 201 and the reverse clutch mechanism 202 engages, the other cannot be pulled, thereby effectively preventing the internal structure of the conveying trough 100 from rotating both forward and reverse at the same time. Specifically, the locking device 300 includes a locking bracket 302 and a return spring 303. One end of the locking bracket 302 abuts against the forward clutch mechanism 201, and the other end abuts against the reverse clutch mechanism 202. Under the action of the return spring 303, the locking bracket 302 always maintains contact with both the forward clutch mechanism 201 and the reverse clutch mechanism 202. When the forward clutch mechanism 201 is engaged, the locking bracket 302, under the action of the return spring 303, causes the reverse clutch mechanism 202 to be stuck and thus cannot be pulled. That is, when the forward clutch mechanism 201 is engaged, the reverse clutch mechanism 202 cannot be engaged. When the forward clutch mechanism 201 is in an unengaged state, pulling the reverse clutch mechanism 202 to engage it will prevent the forward clutch mechanism 201 from engaging under the action of the return spring 303. The locking device 300 effectively protects the normal operation of the internal mechanism of the conveying trough 100 and prevents damage to the conveying trough 100 due to operator error.

[0047] In one embodiment, the conveying trough 100 includes a housing 101, a conveying chain 102, and a transmission mechanism 103. The conveying chain 102 is disposed inside the housing 101, and the clutch assembly 200 drives the conveying chain 102 through the transmission mechanism 103. The housing 101 of the conveying trough 100 is a square pipe, and the conveying chain 102 is disposed inside the housing 101. Through the rotation of the conveying chain 102, hay and forage are conveyed from one end of the conveying trough 100 to the other end.

[0048] The transmission mechanism 103 includes a bevel gear 103a, a forward rotating shaft 103b, a reverse rotating shaft 103c, and a chain shaft 103d. One end of the forward rotating shaft 103b and the reverse rotating shaft 103c are both meshed with the same bevel gear 103a. The forward rotating shaft 103b is connected to one end of the chain shaft 103d through a forward rotating clutch mechanism 201, and the reverse rotating shaft 103c is connected to the other end of the chain shaft 103d through a reverse rotating clutch mechanism 202. The conveyor chain 102 is driven by the chain shaft 103d.

[0049] The end of the forward rotating shaft 103b away from the bevel gear 103a is connected to the chain shaft 103d via a forward clutch mechanism, and the end of the reverse rotating shaft 103c away from the bevel gear 103a is connected to the chain shaft 103d via a reverse clutch mechanism. The forward rotating clutch mechanism 201 includes a forward rotating clutch 201a, a forward rotating drive wheel 201b, a forward rotating driven wheel 201c, and a forward rotating belt 201d. A forward rotating clutch 201a is provided between the forward rotating drive wheel 201b and the forward rotating shaft 103b, and the same forward rotating belt 201d is fitted onto both the forward rotating drive wheel 201b and the forward rotating driven wheel 201c. The reversing clutch mechanism 202 includes a reversing clutch 202a, a reversing drive wheel 202b, a reversing driven wheel 202c, and a reversing belt 202d. The reversing drive wheel 202b is provided with a reversing clutch 202a between it and the reversing shaft 103c. The same reversing belt 202d is fitted on the reversing drive wheel 202b and the reversing driven wheel 202c. The forward rotation drive wheel 201b is powered by a motor or engine. The forward rotation drive wheel 201b drives the forward rotation shaft 103b to rotate through the forward rotation clutch 201a. The forward rotation shaft 103b meshes with the bevel gear 103a, and the bevel gear 103a rotates under the drive of the forward rotation shaft 103b. The bevel gear 103a also meshes with the reverse rotation shaft 103c. The reverse rotation shaft 103c and the forward rotation shaft 103b are set on the same axis. Therefore, the reverse rotation shaft 103c rotates in the opposite direction to the forward rotation shaft 103b. The reverse rotation shaft 103c is connected to the reverse rotation drive wheel 202b through the reverse rotation clutch 202a.

[0050] Furthermore, since one end of the forward rotation clutch 201a is connected to the forward rotation shaft 103b and the other end is connected to the forward rotation drive wheel 201b, when the forward rotation clutch 201a is engaged, the forward rotation shaft 103b and the forward rotation drive wheel 201b are essentially fixedly connected. The forward rotation drive wheel 201b drives the forward rotation driven wheel 201c to rotate via the forward rotation belt 201d. The forward rotation driven wheel 201c is sleeved on one end of the chain shaft 103d. Therefore, when the forward rotation clutch 201a is engaged, the chain shaft 103d drives the conveyor chain 102 to transport the hay from the bottom end of the conveyor trough 100 to the top end of the conveyor trough 100. One end of the reverse rotation clutch 202a is connected to the reverse rotation shaft 103c and the other end is connected to the reverse rotation drive wheel 202b. When the reverse rotation clutch 202a is engaged, the reverse rotation shaft 103c drives the chain chain 102 to transport the hay from the bottom end of the conveyor trough 100 to the top end of the conveyor trough 100. 3c is fixedly connected to the reverse drive wheel 202b. Therefore, the reverse shaft 103c drives the reverse drive wheel 202b to rotate. The reverse drive wheel 202b drives the reverse driven wheel 202c to rotate through the reverse belt 202d. The reverse driven wheel 202c is sleeved on the end of the chain shaft 103d away from the forward driven wheel 201c. Therefore, when the reverse clutch 202a is engaged, the chain shaft 103d drives the conveyor chain 102 to convey the grass and grain from the top of the conveyor trough 100 to the bottom of the conveyor trough 100.

[0051] Furthermore, the forward clutch mechanism 201 also includes a forward clutch handle 201e and a forward cable 201f. The forward clutch handle 201e is located in the cab, and the lower end of the forward clutch handle 201e is connected to the forward clutch 201a via the forward cable 201f. The reverse clutch mechanism 202 also includes a reverse clutch handle 202e and a reverse cable 202f. The reverse clutch handle 202e is located in the cab, and the lower end of the reverse clutch handle 202e is connected to the reverse clutch 202a via the reverse cable 202f. The reverse clutch handle 202e and the forward clutch handle 201e are provided with the same locking device 300 below them.

[0052] The forward clutch handle 201e and the reverse clutch handle 202e are placed on the same locking device 300. Both the forward clutch handle 201e and the reverse clutch handle 202e are located in the operator's cab. When the operator pulls the forward clutch handle 201e, the forward clutch handle engages the forward clutch 201a, which in turn drives the forward drive wheel 201b to rotate. The forward drive wheel 201b drives the forward driven wheel 201c to rotate, which in turn causes the chain shaft 103d to drive the conveyor chain 102 to rotate. The conveyor chain 102 transports the hay to the threshing section. At the same time, with the forward clutch handle 201e pulled, the reverse clutch handle engages the reverse clutch 202e. The clutch handle 202e cannot be pulled under the action of the locking device 300. When the operator pulls the reverse clutch handle 202e, the reverse handle engages the reverse clutch 202a, which in turn drives the reverse drive wheel 202b to rotate. The reverse drive wheel 202b drives the reverse driven wheel 202c to rotate, which in turn causes the chain shaft 103d to drive the conveyor chain 102 to rotate. The conveyor chain 102 transports the hay from the top of the conveyor trough 100 to the bottom of the conveyor trough 100. At the same time, with the reverse clutch handle 202e pulled, the forward clutch handle 201e cannot be pulled under the action of the locking device 300. Therefore, only one of the forward clutch handle 201e and the reverse clutch handle 202e can be pulled at the same time, effectively preventing the chain shaft 103d from being damaged by having to rotate both forward and reverse when both are pulled simultaneously.

[0053] In one embodiment, the locking bracket 302 has a friction block 302a at one end and a hook 302b at the other end. The end of the locking bracket 302 with the friction block 302a contacts the forward clutch handle 201e, and the end of the locking bracket 302 with the hook 302b contacts the reverse clutch handle 202e. The forward clutch handle 201e has a first rotating shaft 201e-1 at its lower end. The forward clutch handle 201e is rotatably connected to the side wall of the plate 301 through the first rotating shaft 201e-1. A ball head pin 201e-2 is located below the forward clutch handle 201e and abuts against the friction block 302a. The reverse clutch handle 202e has a second rotating shaft 202e-1 at its lower end. The reverse clutch handle 202e is rotatably connected to the side wall of the plate 301 through the second rotating shaft 202e-1. A locking pin 202e-2 is located below the reverse clutch handle 202e and abuts against the hook 302b.

[0054] The forward clutch handle 201e has a ball head pin 201e-2 at its lower end. Under the action of the return spring 303, the friction block 302a is always in contact with the ball head pin 201e-2. When the operator pulls the forward clutch handle 201e, the ball head pin 201e-2 pushes the locking bracket 302 to rotate clockwise. The hook 302b at the other end of the locking bracket 302 then engages with the reverse clutch handle 202e. At this time, the reverse clutch handle 201e... 2e is limited and cannot rotate; when the operator pulls the reverse clutch handle 202e, the locking pin 202e-2 located below the reverse clutch handle 202e pushes the hook 302b to rotate the locking bracket 302 counterclockwise. The friction block 302a at the other end of the locking bracket 302 will then tightly engage with the ball head pin 201e-2 located on the forward clutch handle 201e, preventing the forward clutch handle 201e from rotating. This effectively protects against damage to the chain shaft 103d caused by operator error when the forward clutch mechanism 201 and the reverse clutch mechanism 202 engage simultaneously, requiring the chain shaft 103d to rotate both forward and reverse.

[0055] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A combine harvester with a locking device, comprising a harvester, a cab, and a threshing unit, characterized in that: It also includes, A conveying trough (100) is provided, one end of which is connected to a harvester and the other end of which is connected to a threshing section; the conveying trough (100) includes a shell (101), which is a square pipe; A clutch assembly (200) includes a forward clutch mechanism (201) and a reverse clutch mechanism (202), both of which are disposed on one side of the conveying trough (100). The forward clutch mechanism (201) includes a forward clutch handle (201e), and the reverse clutch mechanism (202) includes a reverse clutch handle (202e), which is disposed inside the driver's cab. A locking device (300) includes a locking bracket (302) and a return spring (303). One end of the return spring (303) abuts against the locking bracket (302) and limits the locking bracket (302). One end of the locking bracket (302) abuts against the forward clutch handle (201e) and the other end of the locking bracket (302) abuts against the reverse clutch handle (202e) so that only one of the forward clutch handle (201e) and the reverse clutch handle (202e) can be pulled at the same time. The locking device (300) also includes a plate (301). A pin is provided at the middle position of the locking bracket (302). The locking device (300) is rotatably connected to the plate (301) through the pin. A return spring (303) is sleeved on the end of the pin away from the plate (301). One end of the return spring (303) is fixed on the plate (301), and the other end of the return spring (303) abuts against the locking bracket (302). One end of the locking bracket (302) is provided with a friction block (302a), and the other end of the locking bracket (302) is provided with a hook (302b). The end of the locking bracket (302) with the friction block (302a) contacts the forward clutch handle (201e), and the end of the locking bracket (302) with the hook (302b) contacts the reverse clutch handle (202e). The lower end of the forward-rotating clutch handle (201e) is provided with a first rotating shaft (201e-1). The forward-rotating clutch handle (201e) is rotatably connected to the side wall of the plate (301) through the first rotating shaft (201e-1). A ball head pin (201e-2) is provided below the forward-rotating clutch handle (201e). The ball head pin (201e-2) abuts against the friction block (302a). The lower end of the reverse clutch handle (202e) is provided with a second rotating shaft (202e-1). The reverse clutch handle (202e) is rotatably connected to the side wall of the plate (301) through the second rotating shaft (202e-1). A locking pin (202e-2) is provided below the reverse clutch handle (202e). The locking pin (202e-2) abuts against the hook (302b).

2. A combine harvester with a locking device according to claim 1, characterized in that: The conveying trough (100) also includes a conveying chain (102) and a transmission mechanism (103). The conveying chain (102) is located inside the housing (101). The clutch assembly (200) links the conveying chain (102) through the transmission mechanism (103).

3. A combine harvester with a locking device according to claim 2, characterized in that: The transmission mechanism (103) includes a bevel gear (103a), a forward rotating shaft (103b), a reverse rotating shaft (103c), and a chain shaft (103d). One end of the forward rotating shaft (103b) and the reverse rotating shaft (103c) are both meshed with the same bevel gear (103a). The forward rotating shaft (103b) is connected to one end of the chain shaft (103d) through a forward rotating clutch mechanism (201). The reverse rotating shaft (103c) is connected to the other end of the chain shaft (103d) through a reverse rotating clutch mechanism (202). The conveyor chain (102) is driven by the chain shaft (103d).

4. A combine harvester with a locking device according to claim 3, characterized in that: The forward rotation clutch mechanism (201) includes a forward rotation clutch (201a), a forward rotation drive wheel (201b), a forward rotation driven wheel (201c), and a forward rotation belt (201d). The forward rotation drive wheel (201b) is provided with a forward rotation clutch (201a) between it and the forward rotation shaft (103b). The same forward rotation belt (201d) is fitted on the forward rotation drive wheel (201b) and the forward rotation driven wheel (201c).

5. A combine harvester with a locking device according to claim 3, characterized in that: The reversing clutch mechanism (202) includes a reversing clutch (202a), a reversing drive wheel (202b), a reversing driven wheel (202c), and a reversing belt (202d). The reversing drive wheel (202b) is provided with a reversing clutch (202a) between it and the reversing shaft (103c). The same reversing belt (202d) is fitted on the reversing drive wheel (202b) and the reversing driven wheel (202c).

6. A combine harvester with a locking device according to claim 4, characterized in that: The forward clutch mechanism (201) also includes a forward cable (201f), and the forward clutch handle (201e) is located in the cab. The lower end of the forward clutch handle (201e) is connected to the forward clutch (201a) through the forward cable (201f).

7. A combine harvester with a locking device according to claim 5, characterized in that: The reverse clutch mechanism (202) also includes a reverse cable (202f), and the lower end of the reverse clutch handle (202e) is connected to the reverse clutch (202a) through the reverse cable (202f). The reverse clutch handle (202e) and the forward clutch handle (201e) are provided with the same locking device (300) below them.

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