Gap bridge driving device of grain harvester

Abstract

The utility model discloses a gap bridge driving device of a grain harvester, relates to the technical field of harvesters, and solves the problem that when a gap bridge of an existing harvester is blocked, time and labor are wasted in cleaning blockage. In the gap bridge driving device of the grain harvester, a belt wheel hub and a pressing disc are connected through a plurality of screw rods, and each screw rod is sleeved with a friction plate pressure spring; the second shaft sleeve part is arranged between the belt wheel hub and the pressing disc, a friction plate is installed between the left side face of the second shaft sleeve part and the belt wheel hub, the other friction plate is installed between the right side face of the second shaft sleeve part and the pressing disc, and the belt wheel hub, the friction plates, the driving hub and the pressing disc are pressed through elastic force of springs of friction plate compression springs. A large static friction force is provided through the friction plate, the hub is driven to synchronously rotate along with the large belt wheel, meanwhile, the transmission shaft and the chain wheels on the transmission shaft are driven to rotate, normal work of the harvester is achieved, and when the gap bridge driving device is blocked, the motor or the motor drives the small belt wheel to reversely rotate, and gap bridge blockage can be cleaned.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of harvester, especially a kind of overbridge driving device of grain harvester. BACKGROUND

[0002] Harvester can complete crop harvesting, threshing, separation, cleaning, set grain process, and the overbridge of harvester is the important working component to transport the crop harvested by cutting platform to threshing cylinder, when harvesting operation is carried out, sometimes the overbridge is blocked, when this situation is encountered, we need to stop and clean the blockage, consume a lot of time, and the cleaning difficulty is greater, therefore the demand of quickly cleaning overbridge blockage is very strong. CONTENT OF UTILITY MODEL

[0003] In view of the above-mentioned existing harvester overbridge blockage, the cleaning blockage is time-consuming and laborious, the utility model aims at providing an overbridge driving device of grain harvester, which realizes reliable reverse of overbridge and quickly cleans overbridge blockage.

[0004] In order to realize the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0005] An overbridge driving device of grain harvester, comprising:

[0006] A transmission shaft 4 is rotatably installed on the overbridge shell;

[0007] A drive hub 13 is installed on the end of the right end of the transmission shaft 4, the drive hub 13 is provided with a first shaft sleeve part 131, a second shaft sleeve part 132 and a third shaft sleeve part 133, the first shaft sleeve part 131, the second shaft sleeve part 132 and the third shaft sleeve part 133 are coaxially arranged and sequentially connected from left to right, and a plurality of limiting grooves 134 are formed in the right end face of the third shaft sleeve part 133;

[0008] A pulley hub 9 and a pressure plate 12, the pulley hub 9 is installed on the first shaft sleeve part 131, and the pressure plate 12 is installed on the third shaft sleeve part 133, and the second shaft sleeve part 132 is arranged between the pulley hub 9 and the pressure plate 12;

[0009] A small pulley 8 and a large pulley 10, the small pulley 8 is sleeved on the transmission shaft 4 and installed on the left side of the pulley hub 9, and the large pulley 10 is sleeved on the drive hub 13 and installed on the right side of the pulley hub 9, and the large pulley 10 and the small pulley 8 are connected;

[0010] A friction plate 11 is installed between the left side of the second shaft sleeve part 132 and the pulley hub 9, and another friction plate 11 is installed between the right side of the second shaft sleeve part 132 and the pressure plate 12;

[0011] The screw rod 6 and the friction plate compression spring 7, the belt wheel hub 9 and the compression plate 12 are connected by the plurality of screw rods 6, each of which is sleeved with a friction plate compression spring 7, and the belt wheel hub 9 and the compression plate 12 are compressed by the plurality of friction plate compression springs 7.

[0012] The above-mentioned grain harvester bridge driving device further comprises: a block pull spring 1 and a block 2, the inner circumferential surface of the right end surface of the large belt wheel 10 is symmetrically provided with two connecting parts, one end of each block 2 is rotationally connected with one connecting part, one end of each block pull spring 1 is connected with the middle part of one block 2, the other end of each block pull spring 1 is connected with the compression plate 12, and the other end of each block 2 is matched with a limiting groove 134.

[0013] The above-mentioned grain harvester bridge driving device further comprises: a bearing 3, the left and right ends of the transmission shaft 4 are rotationally connected with the bridge shell through two bearings 3, and the end of the left end of the transmission shaft 4 is provided with a through hole for assembling a pin shaft.

[0014] The above-mentioned grain harvester bridge driving device further comprises: a lock sleeve 14, the right end of the drive wheel hub 13 is provided with a limiting assembly groove 135, the lock sleeve 14 is assembled at the end of the right end of the transmission shaft 4, and the lock sleeve 14 is arranged in the limiting assembly groove 135.

[0015] The above-mentioned grain harvester bridge driving device further comprises: a sprocket 5, and the middle part of the transmission shaft 4 is provided with a plurality of sprockets 5.

[0016] The above-mentioned grain harvester bridge driving device further comprises: a sprocket 5, and the middle part of the transmission shaft 4 is provided with a plurality of sprockets 5.

[0017] The above-mentioned grain harvester bridge driving device further comprises: a sprocket 5, and the middle part of the transmission shaft 4 is provided with a plurality of sprockets 5.

[0018] The above-mentioned grain harvester bridge driving device further comprises: a sprocket 5, and the middle part of the transmission shaft 4 is provided with a plurality of sprockets 5.

[0019] The above-mentioned grain harvester bridge driving device further comprises: a sprocket 5, and the middle part of the transmission shaft 4 is provided with a plurality of sprockets 5.

[0020] The above-mentioned grain harvester bridge driving device further comprises: a sprocket 5, and the middle part of the transmission shaft 4 is provided with a plurality of sprockets 5.

[0021] The utility model discloses a kind of overbridge driving devices of grain harvester, including drive wheel hub, drive wheel, transmission shaft, multiple chain wheels, multiple sprocket wheels, multiple friction plates, multiple friction plate springs, multiple pressure plates and multiple second shaft sleeves, it is characterized by: drive wheel hub is connected with drive wheel through transmission shaft, and transmission shaft is connected with multiple chain wheels through multiple sprocket wheels, multiple sprocket wheels are connected with multiple friction plates through multiple friction plate springs, and multiple friction plates are connected with multiple pressure plates through multiple second shaft sleeves.

[0022] (1) In the utility model, the wheel hub and the pressure plate are connected through multiple screws, a friction plate spring is sleeved on each screw, the second shaft sleeve part is arranged between the wheel hub and the pressure plate, a friction plate is installed between the left side surface of the second shaft sleeve part and the wheel hub, another friction plate is installed between the right side surface of the second shaft sleeve part and the pressure plate, the wheel hub, the two friction plates, the drive wheel hub and the pressure plate are compressed by the spring force of the friction plate spring, and then the larger static friction force is provided by the friction plate, the drive wheel hub rotates synchronously with the large drive wheel, simultaneously drives the multiple sprocket wheels on the transmission shaft to rotate, and the normal work of the harvester is realized.

[0023] (2) In the utility model, when the overbridge driving device is blocked, the power output end of the harvester continues to drive the large drive wheel to rotate, the resistance of the restricted rotation of the transmission shaft is greater than the static friction force provided by the two friction plates, the transmission shaft cannot continue to rotate, the sliding friction occurs between the wheel hub and the second shaft sleeve part, and the sliding friction occurs between the pressure plate and the second shaft sleeve part simultaneously, so that when the overbridge driving device is blocked, the transmission shaft cannot continue to rotate, and when the power output end of the harvester continues to drive the large drive wheel to rotate, the overbridge driving device is damaged.

[0024] (3) In the utility model, when the overbridge driving device is blocked, the staff cuts off the power input of the large drive wheel, drives the small drive wheel to rotate reversely through the motor or the motor, the small drive wheel drives the wheel hub and the large drive wheel to reverse, and the stop block on the large drive wheel is clamped in the limiting groove of the drive wheel hub, directly drives the drive wheel hub to realize the reverse function. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structure diagram of the overbridge driving device of the grain harvester.

[0026] Figure 2 It is a sectional view of Figure 1 .

[0027] Figure 3 It is the first local enlarged view of Figure 2 .

[0028] Figure 4 It is the second local enlarged view of Figure 2 .

[0029] Figure 5 It is a structure diagram of the drive wheel hub.

[0030] In the drawing: 1, stop block tension spring; 2, stop block; 3, bearing; 4, transmission shaft; 5, chain wheel; 6, screw rod; 7, friction plate compression spring; 8, small pulley; 9, pulley hub; 10, large pulley; 11, friction plate; 12, pressure plate; 13, drive wheel hub; 14, lock sleeve; 131, first shaft sleeve part; 132, second shaft sleeve part; 133, third shaft sleeve part; 134, limiting groove; 135, limiting assembly groove. DETAILED DESCRIPTION

[0031] The utility model will be further explained in connection with the drawing and specific embodiment, but not as the limitation of the utility model.

[0032] Please refer to Figures 1 to 5 It shows a kind of overbridge driving device of grain harvester, and it includes:

[0033] Transmission shaft 4, transmission shaft 4 is rotatably installed on overbridge shell;

[0034] Drive wheel hub 13, drive wheel hub 13 is installed at the end of the right end of transmission shaft 4, and drive wheel hub 13 is provided with first shaft sleeve part 131, second shaft sleeve part 132 and third shaft sleeve part 133, first shaft sleeve part 131, second shaft sleeve part 132 and third shaft sleeve part 133 are coaxially arranged and sequentially connected from left to right, and a plurality of limiting grooves 134 are formed in the right end face of third shaft sleeve part 133;

[0035] Pulley hub 9 and pressure plate 12, pulley hub 9 is installed on first shaft sleeve part 131, and pressure plate 12 is installed on third shaft sleeve part 133, and second shaft sleeve part 132 is arranged between pulley hub 9 and pressure plate 12;

[0036] Small pulley 8 and large pulley 10, small pulley 8 is sleeved on transmission shaft 4 and installed on the left side of pulley hub 9, large pulley 10 is sleeved on drive wheel hub 13 and installed on the right side of pulley hub 9, and large pulley 10 is connected with small pulley 8;

[0037] Friction plate 11, one friction plate 11 is installed between the left side surface of second shaft sleeve part 132 and pulley hub 9, and another friction plate 11 is installed between the right side surface of second shaft sleeve part 132 and pressure plate 12;

[0038] Screw rod 6 and friction plate compression spring 7, pulley hub 9 and pressure plate 12 are connected by a plurality of screw rods 6, one friction plate compression spring 7 is sleeved on each screw rod 6, and pulley hub 9 and pressure plate 12 are compressed by a plurality of friction plate compression springs 7.

[0039] Further, in a preferred embodiment, further comprising: the block pull spring 1 and the block 2, the inner circumference of the right end face of the large belt wheel 10 is symmetrically provided with two connecting portions, one end of each block 2 is rotationally connected with one connecting portion, one end of each block pull spring 1 is connected with the middle part of one block 2, the other end of each block pull spring 1 is connected with the pressing disc 12, and the other end of each block 2 is matched with one limiting recess 134.

[0040] Further, in a preferred embodiment, further comprising: the bearing 3, the left and right ends of the transmission shaft 4 are respectively rotationally connected with the bridge shell through two bearings 3, and the end of the left end of the transmission shaft 4 is provided with a through hole for assembling a pin shaft.

[0041] Further, in a preferred embodiment, further comprising: the lock sleeve 14, the right end of the drive wheel hub 13 is provided with a limiting assembly groove 135, the lock sleeve 14 is assembled at the end of the right end of the transmission shaft 4, and the lock sleeve 14 is arranged in the limiting assembly groove 135.

[0042] Further, in a preferred embodiment, further comprising: the chain wheel 5, the middle part of the transmission shaft 4 is provided with a plurality of chain wheels 5.

[0043] Further, in a preferred embodiment, the drive wheel hub 13 and the transmission shaft 4 are connected through a key.

[0044] Further, in a preferred embodiment, the plurality of chain wheels 5 are all connected with the transmission shaft 4 through a key.

[0045] Further, in a preferred embodiment, the friction plate pressing spring 7 comprises: a gasket and a spring, a sleeve is sleeved on the threaded rod of each screw rod 6, at least one nut is assembled on the threaded rod of each screw rod 6, the gasket is sleeved on the threaded rod of the screw rod 6, the spring is sleeved on the sleeve, one end of the spring abuts against the large belt wheel 10, the other end of the spring abuts against one side surface of the gasket, and the other side surface of the gasket abuts against the nut.

[0046] Further, in a preferred embodiment, a plurality of through holes matched with the threaded rods are formed in the pressing disc 12, and a plurality of through holes matched with the sleeves are formed in the belt wheel hub 9.

[0047] Further, in a preferred embodiment, the right end outer diameter of the lock sleeve 14 is greater than the left end outer diameter of the lock sleeve 14, and the lock sleeve 14 is assembled in the limiting assembly groove 135 through a screw.

[0048] The above is only a preferred embodiment of the utility model, and does not limit the implementation mode and protection scope of the utility model.

[0049] The utility model further has the following implementation modes on the basis of the above.

[0050] In a further embodiment of the utility model, the large pulley 10 is in transmission connection with the power output end of the harvester, the power output end of the harvester is used to drive the large pulley 10 to rotate forward, as shown in Figures 1 to 4 , so that the harvester can work normally; the small pulley 8 is in transmission connection with the driving device, the driving device is used to drive the small pulley 8 to rotate reversely, as shown in Figures 1 to 4 , so that the overbridge jam can be cleaned quickly; the driving device can be a motor or a motor; the large pulley 10 and the small pulley 8 are connected through a plurality of connecting shafts, as shown in Figure 4 .

[0051] In a further embodiment of the utility model, as shown in Figures 1 to 4 , the embodiment discloses an overbridge driving device, which comprises a stopper tension spring 1, a stopper 2, a bearing 3, a transmission shaft 4, a chain wheel 5, a screw rod 6, a friction plate compression spring 7, a small pulley 8, a pulley hub 9, a large pulley 10, a friction plate 11, a pressure plate 12, a driving wheel hub 13 and a lock sleeve 14.

[0052] The transmission shaft 4 is installed on the two bearings 3 and can rotate freely; the two bearings 3 are fixed on the overbridge shell; the three chain wheels 5, the driving wheel hub 13 and the lock sleeve 14 are fixed on the transmission shaft 4 and rotate together with the transmission shaft 4; the driving wheel hub 13 is installed with the friction plate 11 on both sides; the left friction plate 11 is installed with the pulley hub 9 on the other side; the right friction plate 11 is installed with the pressure plate 12 on the other side; the pulley hub 9, the two friction plates 11, the driving wheel hub 13 and the pressure plate 12 are compressed together through the friction plate compression spring 7 and the screw rod 6; the pulley hub 9 is installed with the large pulley 10 and the small pulley 8 on both sides; the stopper tension spring 1 and the stopper 2 are installed on the large pulley 10; the stopper 2 can rotate around the rotating shaft; the stopper tension spring 1 pulls the stopper 2 into the limiting groove 134 on the driving wheel hub 13.

[0053] In a further embodiment of the utility model, the working process of the utility model is as follows: when the harvester works normally, the power of the transmission shaft 4 is input by the large pulley 10; the large pulley 10 drives the driving wheel hub 13 and the transmission shaft 4 to rotate forward through the friction plate 11; when the load is too large and exceeds the power that can be transmitted by the friction plate 11, the friction plate 11 slips, the power transmission is interrupted, and all working parts are protected from being damaged; at this time, the overbridge is jammed; the staff cuts off the power input of the large pulley 10; the small pulley 8 is responsible for the power input; the small pulley 8 can be driven by a motor or a motor; the small pulley 8 drives the pulley hub 9 and the large pulley 10 to rotate reversely; the large pulley 10 drives the driving wheel hub 13 and the transmission shaft 4 to rotate reversely through the stopper 2; the overbridge jam can be cleaned quickly.

[0054] In the further embodiment of the utility model, two stop blocks 2 are respectively installed on the large belt wheel 10 through bolts and can rotate freely around the bolts, one end of each stop block tension spring 1 is connected to the middle part of one stop block 2, the other end of each stop block tension spring 1 is connected to the pressure plate 12, and the pressure plate 12 is pressed together with the large belt wheel 10 through the friction plate compression spring 7 and the screw rod 6. The stop block tension spring 1 always pulls the stop block 2 tightly on the driving wheel hub 13 and is a kind of ratchet mechanism. When normally working and rotating forward, the friction plate 11 does not slip, and all the parts on the transmission shaft 4 rotate together. When the friction plate 11 slips, the driving wheel hub 13 does not rotate, and the large belt wheel 10 continues to rotate. At this time, the stop block 2 can slide out of the limiting groove 134 of the driving wheel hub 13 freely.

[0055] In the further embodiment of the utility model, in order to realize reverse rotation, because the friction plate 11 has slipped, the friction plate 11 cannot drive reverse rotation, so the power during reverse rotation is transmitted through the stop block 2, and the power input during reverse rotation is transmitted through the small belt wheel 8. The small belt wheel 8 drives the belt wheel hub 9 and the large belt wheel 10 to reverse rotation. The stop block 2 on the large belt wheel 10 is clamped in the limiting groove 134 of the driving wheel hub 13, directly drives the driving wheel hub 13 to realize reverse rotation function.

[0056] In the further embodiment of the utility model, the small belt wheel 8 and the large belt wheel 10 are respectively installed on the left and right sides of the belt wheel hub 9 and are used for rotating the belt wheel hub 9. The large belt wheel 10 and the small belt wheel 8 are connected through a plurality of connecting shafts. The large belt wheel 10 is drivingly connected with the power output end of the harvester. The power output end of the harvester is used for driving the large belt wheel 10 to rotate forward and further drives the belt wheel hub 9 to rotate forward. The small belt wheel 8 is drivingly connected with the driving device. The driving device is used for driving the small belt wheel 8 to rotate reversely and further drives the belt wheel hub 9 to rotate reversely.

[0057] In the further embodiment of the utility model, the wheel hub 9 and the pressure plate 12 are connected through multiple screw rods 6, one friction plate pressing spring 7 is sleeved on each screw rod 6, the second shaft sleeve part 132 is arranged between the wheel hub 9 and the pressure plate 12, one friction plate 11 is installed between the left side surface of the second shaft sleeve part 132 and the wheel hub 9, another friction plate 11 is installed between the right side surface of the second shaft sleeve part 132 and the pressure plate 12, the wheel hub 9, the two friction plates 11, the driving wheel hub 13 and the pressure plate 12 are pressed together through the friction plate pressing spring 7 and the screw rod 6, and a larger static friction force is provided through the friction plate 11, when the power output end of the harvester drives the large pulley 10 to rotate forward, the wheel hub 9 and the driving wheel hub 13 rotate synchronously under the action of the multiple screw rods 6 and are in the state of being pressed together through the friction plate pressing spring 7 between the wheel hub 9 and the driving wheel hub 13, under the action of the static friction force provided by the two friction plates 11, the driving wheel hub 13 rotates synchronously with the large pulley 10, the key connection between the driving wheel hub 13 and the transmission shaft 4 drives the transmission shaft 4 and the multiple sprockets 5 thereon to rotate, and the normal work of the harvester is realized, when the over-bridge driving device is blocked, the power output end of the harvester continues to drive the large pulley 10 to rotate, the transmission shaft 4 cannot continue to rotate because the resistance of the limited rotation is greater than the static friction force provided by the two friction plates 11, the wheel hub 9 and the second shaft sleeve part 132 slide, and the pressure plate 12 and the second shaft sleeve part 132 slide at the same time, so that the transmission shaft 4 cannot continue to rotate when the over-bridge driving device is blocked, and damage to the over-bridge driving device is caused when the power output end of the harvester continues to drive the large pulley 10 to rotate.

[0058] In the further embodiment of the utility model, when the over-bridge driving device is blocked, the staff cuts off the power input of the large pulley 10, drives the small pulley 8 to rotate reversely through the motor or the motor, the small pulley 8 drives the wheel hub 9 and the large pulley 10 to reverse, the stop block 2 on the large pulley 10 is clamped in the limiting groove 134 of the driving wheel hub 13, directly drives the driving wheel hub 13 to realize the reverse function, the key connection between the driving wheel hub 13 and the transmission shaft 4 drives the transmission shaft 4 and the multiple sprockets 5 thereon to rotate, and the over-bridge blockage is cleaned.

[0059] In the further embodiment of the utility model, after the multiple screw rods 6 are inserted from one side of the large pulley 10, the threaded rods of the multiple screw rods 6 are hidden in the small pulley 8, so that the multiple screw rods 6 are prevented from extending out and causing injury or colliding in the equipment operation and affecting the equipment operation, the multiple friction plate pressing springs 7 are hidden in the small pulley 8, and the screw rod heads of the multiple screw rods 6 are hidden in the large pulley 10.

[0060] In further embodiments of the utility model, the outer wall of the lock sleeve 14 is designed as a circular truncated cone, the outer diameter of the left end is smaller than that of the right end, which facilitates assembly and is used for locking the large pulley 10, and ensures stable rotation of the drive hub 13 with the transmission shaft 4.

[0061] In further embodiments of the utility model, the pulley hub 9 and the pressure plate 12 are connected through a plurality of screw rods 6, one friction plate compression spring 7 is sleeved on each screw rod 6, the second shaft sleeve part 132 is arranged between the pulley hub 9 and the pressure plate 12, one friction plate 11 is arranged between the left side surface of the second shaft sleeve part 132 and the pulley hub 9, and another friction plate 11 is arranged between the right side surface of the second shaft sleeve part 132 and the pressure plate 12; the pulley hub 9, the two friction plates 11, the drive hub 13 and the pressure plate 12 are compressed by the spring force of the friction plate compression spring 7, and then a larger static friction force is provided through the friction plate 11; when the bridge driving device is blocked, the pulley hub 9, the two friction plates 11, the drive hub 13 and the pressure plate 12 are skidded, at this time, the spring of the friction plate compression spring 7 can adjust the length according to the force, in the reverse rotation process of the large pulley 10, the friction plate 11 has skidded, and the reverse rotation cannot be driven through the friction plate 11, so the power in the reverse rotation is transmitted through the stop block 2, the small pulley 8 drives the pulley hub 9 and the large pulley 10 to reverse, the stop block 2 on the large pulley 10 is clamped in the limiting groove 134 of the drive hub 13, directly drives the drive hub 13 to realize the reverse rotation function, and after the bridge blockage is quickly cleaned through the reverse rotation of the drive hub 13, the screw rod 6 and the friction plate compression spring 7 do not need to be adjusted, the friction plate compression spring 7 still compresses the pulley hub 9, the two friction plates 11, the drive hub 13 and the pressure plate 12, so that when the power output end of the harvester drives the large pulley 10 to rotate forward, the drive hub 13 rotates synchronously with the large pulley 10 under the action of the static friction force provided by the two friction plates 11, simultaneously drives the transmission shaft 4 and the plurality of sprockets 5 thereon to rotate, and realizes the normal work of the harvester.

[0062] In further embodiments of the utility model, a sleeve is sleeved on the threaded rod of each screw rod 6, and the spring of the friction plate compression spring 7 is sleeved on the sleeve, so as to avoid direct contact between the spring and the threaded rod and generate abrasion.

[0063] The above are only the preferred embodiments of the utility model, and do not limit the implementation manners and protection scope of the utility model, and those skilled in the art should realize that any equivalent replacement and obvious change made according to the contents of the utility model specification and drawings should be included in the protection scope of the utility model.

Claims

1. A bridge drive device for a grain harvester, characterized in that, include: Drive shaft (4) is rotatably mounted on the bridge housing; A drive hub (13) is installed at the right end of the transmission shaft (4). The drive hub (13) is provided with a first bushing (131), a second bushing (132) and a third bushing (133). The first bushing (131), the second bushing (132) and the third bushing (133) are coaxially arranged and connected from left to right. The right end face of the third bushing (133) is provided with a plurality of limiting grooves (134). The pulley hub (9) and the pressure plate (12) are provided. The pulley hub (9) is mounted on the first bushing (131), the pressure plate (12) is mounted on the third bushing (133), and the second bushing (132) is located between the pulley hub (9) and the pressure plate (12). Small pulley (8) and large pulley (10). The small pulley (8) is sleeved on the drive shaft (4) and installed on the left side of the pulley hub (9). The large pulley (10) is sleeved on the drive hub (13) and installed on the right side of the pulley hub (9). The large pulley (10) and the small pulley (8) are connected. Friction plate (11): A friction plate (11) is installed between the left side of the second bushing (132) and the pulley hub (9), and another friction plate (11) is installed between the right side of the second bushing (132) and the pressure plate (12). The screw (6) and friction plate spring (7), pulley hub (9) and pressure plate (12) are connected by multiple screws (6), and each screw (6) is fitted with a friction plate spring (7). The pulley hub (9) and pressure plate (12) are pressed by multiple friction plate springs (7).

2. The bridge drive device for a grain harvester according to claim 1, characterized in that, Also includes: The stop spring (1) and the stop (2) are symmetrically arranged on the inner circumference of the right end face of the large pulley (10). One end of each stop (2) is rotatably connected to a connecting part, one end of each stop spring (1) is connected to the middle of a stop (2), the other end of each stop spring (1) is connected to the pressure plate (12), and the other end of each stop (2) is matched with a limiting groove (134).

3. The bridge drive device for a grain harvester according to claim 1, characterized in that, Also includes: The left and right ends of the bearing (3) and the transmission shaft (4) are rotatably connected to the bridge housing through the two bearings (3). The left end of the transmission shaft (4) is provided with a through hole for mounting the pin.

4. The bridge drive device for a grain harvester according to claim 1, characterized in that, Also includes: The locking sleeve (14) has a limiting assembly groove (135) on the right end of the drive hub (13). The locking sleeve (14) is installed at the right end of the drive shaft (4) and is located in the limiting assembly groove (135).

5. The bridge drive device for a grain harvester according to claim 1, characterized in that, Also includes: A sprocket (5) is mounted in the middle of the drive shaft (4).

6. The bridge drive device for a grain harvester according to claim 1, characterized in that, The drive hub (13) and the drive shaft (4) are connected by a key.

7. The bridge drive device for a grain harvester according to claim 5, characterized in that, Multiple sprockets (5) are connected to the drive shaft (4) by keys.

8. The bridge drive device for a grain harvester according to claim 1, characterized in that, The friction plate compression spring (7) includes: a washer and a spring. A sleeve is fitted on the threaded rod of each screw (6). At least one nut is fitted on the threaded rod of each screw (6). The washer is fitted on the threaded rod of the screw (6). The spring is fitted on the sleeve. One end of the spring abuts against the large pulley (10). The other end of the spring abuts against one side of the washer. The other side of the washer abuts against the nut.

9. The bridge drive device for a grain harvester according to claim 8, characterized in that, The pressure plate (12) has multiple through holes that match the threaded rod, and the pulley hub (9) has multiple through holes that match the sleeve.

10. The bridge drive device for a grain harvester according to claim 4, characterized in that, The outer diameter of the right end of the lock sleeve (14) is larger than the outer diameter of the left end of the lock sleeve (14), and the lock sleeve (14) is assembled in the limiting assembly groove (135) by screws.

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