A small device for cleaning ballast under railway sleepers

Abstract

The invention discloses a small device for cleaning ballast under railway sleepers, comprising a car body, a horizontal moving device, a lifting device, a steering device and a ballast cleaning device; the device of the invention has a simple structure, low cost, strong versatility, convenient operation, and is easy to promote. It can clean the ballast under railway main lines and complex turnout sleepers. When implementing the ballast cleaning operation, multiple devices can be used in combination, which can greatly reduce the labor intensity of railway workers and improve the efficiency of manual ballast cleaning.

Description

Technical Field

[0001] The invention belongs to the field of railway design and manufacture, and in particular relates to a small device suitable for cleaning ballast under railway main lines and turnout sleepers. Background Art

[0002] The ballast bed is a ballast (stone ballast) cushion layer laid on the roadbed. Its main function is to support the sleepers, maintain the position of the sleepers, prevent the sleepers from moving longitudinally or laterally, evenly transfer the pressure on the sleepers to the roadbed, and remove rainwater from the ground, so that the track has sufficient elasticity and alleviates the impact of locomotives and vehicles on the rails. The soil brought into the ballast bed by wind and water, or the powder of the broken ballast often fills the gaps in the ballast bed, making the ballast bed form an impermeable layer, which is not drained well, and eventually leads to the compaction of the ballast bed, the decrease of elasticity, and the deterioration of the shock absorption effect, thus affecting driving safety. Therefore, railway workers need to regularly replace the ballast under the track.

[0003] At present, there are two main methods for railway cleaning in my country. One is to use large-scale railway cleaning machines in cooperation with railway workers to carry out cleaning operations, and the other is manual cleaning. Although large-scale railway cleaning machines have high ballast cleaning efficiency and strong mobility, they are expensive and have a low penetration rate. At present, many railway sections in my country (especially turnout sections) are still mainly cleaned by manual labor. Due to the limited space for ballast cleaning operations, the current difficulty of manual ballast cleaning operations is that it is difficult to clean the ballast under the sleepers using existing equipment (shovels, hoes), especially in the northwest region. Due to the serious compaction of ballast under the railway sleepers, ballast cleaning operations are labor-intensive and consume a lot of manpower.

[0004] Some patents and products have been publicly released in this field at home and abroad, but they all have certain limitations when used for railway ballast cleaning operations. A full-section excavation cleaning machine disclosed in China Patent Publication No. CN201785685U can clean the ballast under the main line and turnout sleepers, but it is necessary to widen the bottom beam when cleaning the ballast under the turnout, and the ballast under the composite turnout sleeper cannot be cleaned. It is a large-scale cleaning machine and is expensive. A railway ballast cleaning machine disclosed in China Patent Publication No. CN108930204A does not need to widen the bottom beam when cleaning the ballast under the turnout, but it cannot clean the ballast under the composite turnout sleeper. It is a large-scale cleaning machine, expensive, requires regular maintenance, and is inconvenient for manual operation. At present, domestic ballast cleaning machines all perform ballast cleaning operations from under the sleepers and then screen and backfill. The disadvantage is that the machine model is expensive, cannot clean composite turnouts, is not versatile, and is not convenient for workers to operate. Summary of the invention

[0005] In view of these problems existing in the prior art, the present invention aims to provide a small railway ballast cleaning equipment, which is suitable for working environments with narrow spaces. It can work with auxiliary personnel to clean the ballast under the railway main line and various turnout sleepers. It has a simple structure, is easy to disassemble and assemble, and is easy to transport, making it convenient for railway workers to use.

[0006] The present invention adopts the following technical solution:

[0007] A small device for cleaning ballast under railway sleepers, comprising a vehicle body, a horizontal moving device, a lifting device, a steering device and a ballast cleaning device;

[0008] The vehicle body includes a frame and a wheelset, the frame is fixedly connected to the wheelset, and the wheelset moves on the railway rails;

[0009] The horizontal moving device includes a guide rail, a slider, a limit block and a support plate. There are two guide rails, which are parallel and perpendicular to the steel rails. The guide rails are fixed to the frame. Each guide rail is slidably connected to at least one slider. Limit blocks are provided at both ends of the guide rails to prevent the slider from falling off. The support plate is connected to the top of the sliders of the two guide rails, and the support plate is located between the two guide rails.

[0010] The lifting device includes a column, a rotating support seat, a column end cover, an elevator base, a three-phase asynchronous motor, a coupling 1 and a worm gear screw elevator; the bottom end of the column is fixedly connected to the support plate, the elevator base is slidably sleeved on the column, the top end of the column is connected to the column end cover, the column end cover is connected to the elevator base, the three-phase asynchronous motor and the worm gear screw elevator are both fixed on the elevator base, the output shaft of the three-phase asynchronous motor is connected to the input shaft of the worm gear screw elevator through a coupling 1, the screw of the worm gear screw elevator is parallel to the column, and the lower end of the screw is threadedly connected to the rotating support seat, and a limit block is provided at one end of the screw below the rotating support seat;

[0011] The steering device comprises a bogie and a rotary support bearing, the outer ring of the rotary support bearing is connected to the rotary support seat, the inner ring of the rotary support bearing is connected to the flange of the reducer of the ballast cleaning device, and the bogie is fixedly connected to the flange of the reducer;

[0012] The ballast cleaning device includes a motor, a reducer, a second coupling, a transmission shaft and a ballast cleaning mechanism; the motor is connected to the reducer, the reducer is connected to the transmission shaft through the second coupling, and the other end of the transmission shaft is rotatably connected to the driving sprocket of the ballast cleaning mechanism. The ballast cleaning mechanism includes a driving sprocket, a driven sprocket, a chain and a rake claw. The driving sprocket is connected to the driven sprocket through a chain, and the rake claw is installed on the chain.

[0013] Furthermore, the vehicle body also includes an axle, a bearing seat, a bearing and a frame connecting piece. The wheelset includes two groups, each wheelset includes two wheels, and the two wheels are respectively pressed on the two ends of the axle. The axle located outside the wheelset is rotatably connected to the bearing, and the bearing is located in the bearing seat. The frame connecting piece is fixedly connected to the bearing seat, the frame connecting piece is perpendicular to the axle, and the frame connecting piece is tightly connected to the bottom surface of the frame.

[0014] Furthermore, the steering device also includes a locking mechanism, which includes a locking seat, a connecting rod and a cylindrical pin. The locking seat is fixedly connected to the rotating support seat. One end of the connecting rod is hinged to the locking seat, and the other end is provided with a threaded hole for the cylindrical pin to pass through. The threaded hole matches the threaded hole on the bogie. The locking seat, the connecting rod and the bogie are fixedly connected by inserting the cylindrical pin into the threaded holes of the connecting rod and the bogie.

[0015] Furthermore, the ballast cleaning mechanism also includes a supporting wheel, the driving sprocket is connected to the driven sprocket and the supporting wheel through a chain, and the supporting wheel is located between the driving sprocket and the driven sprocket.

[0016] Preferably, the chain is a roller chain.

[0017] Furthermore, the ballast cleaning device also includes a knife plate, and the driven sprocket and the supporting wheel are mounted on the knife plate.

[0018] Furthermore, the ballast cleaning device also includes a coupling protective sleeve and a transmission shaft protective sleeve. The upper end of the coupling protective sleeve is fixed on the reducer flange, and the lower end of the coupling protective sleeve is connected to the transmission shaft protective sleeve. The coupling is located in the coupling protective sleeve, the transmission shaft is located in the transmission shaft protective sleeve, and the lower end of the transmission shaft protective sleeve is fixedly connected to the knife plate.

[0019] Beneficial effects of the present invention:

[0020] 1. The small-sized equipment for cleaning ballast under railway sleepers of the present invention has simple structure, low cost, and is easy to operate. It adopts electrified equipment and is easy to realize industrialization. It cooperates with railway workers to perform ballast cleaning operations, thus solving the problem of difficult cleaning of ballast under sleepers.

[0021] 2. Large-scale turnout cleaning machines are expensive and can only solve the ballast cleaning problem of single-opening turnouts or three-opening turnouts. There are many compound crossing turnouts in my country that require manual cleaning. The small ballast cleaning equipment of the present invention is universal and can clean the ballast under the railway mainline sleepers as well as the ballast under the sleepers of various complex turnouts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the three-dimensional structure of the present invention;

[0023] Figure 2 It is the main view structure of the present invention;

[0024] Figure 3 yes Figure 2 A partial enlarged view of the middle part;

[0025] Figure 4 It is the left view structure of the present invention;

[0026] Figure 5 yes Figure 4 Partial enlargement of the second part

[0027] Figure 6 It is a top view structure of the present invention;

[0028] Figure 7 It is a structural diagram of the ballast cleaning mechanism. DETAILED DESCRIPTION

[0029] The small railway ballast cleaning equipment of the present invention is very suitable for the "opening skylight" mode in the cleaning of railway trackbeds in my country. First, the railway workers use shovels to clean the ballast between the sleepers and under the sleepers on both sides of the rails. Since this part of the ballast is subjected to less pressure from the railway, it is rarely compacted, and the space is not restricted, which is convenient for cleaning. Then, according to the distance to be cleaned, a number of the small ballast cleaning equipment are placed on the rails to perform ballast cleaning operations.

[0030] The power source of the small ballast cleaning equipment of the present invention can be obtained in two ways. One way is to connect it to the distribution car during the railway screening operation to obtain electricity. The other way is to install a small diesel generator on the frame 11 of each small ballast cleaning equipment.

[0031] The present invention relates to a vehicle body 1, a horizontal moving device 2, a lifting device 3, a steering device 4, a ballast cleaning device 5, a rail 6 and a sleeper 7. The small ballast cleaning device of the present invention is completed by two railway workers, wherein the first worker pushes the ballast cleaning device to move intermittently and slowly along the rail 6, and the second worker rotates the bogie 41 to jointly complete the ballast cleaning operation. When the ballast between the sleepers 7 is cleaned, the first worker pushes the handrail on the vehicle frame 11 forward and the second worker rotates the bogie 41 so that the ballast cleaning mechanism 59 can be located between the two sleepers 7.

[0032] like Figure 1 The present invention includes a vehicle body 1, a horizontal moving device 2, a lifting device 3, a steering device 4, a ballast cleaning device 5, rails 6 and sleepers 7.

[0033] like Figure 4 , 5 The vehicle body 1 of the present invention adopts a simple rail flat car structure, including a frame 11, a wheel set 12, an axle 13, a bearing seat 14, a bearing 15 and a frame connector 16. A set of wheel sets includes two wheels, which are respectively pressed on both ends of the axle, and the axle located outside the wheel set is rotatably connected to the bearing, and the bearing is located in the bearing seat. The frame connector 16 is fixedly connected to the bearing seat, and the frame connector is perpendicular to the axle. The frame connector is fastened to the bottom surface of the frame by screws, bolts, etc.

[0034] The bearing seat 14 includes an upper bearing seat, a lower bearing seat and a bearing cover. The upper bearing seat and the bearing seat are bolted, the upper bearing seat and the lower bearing seat are bolted, and the bearing cover is fixedly installed between the upper bearing seat and the lower bearing seat by screws.

[0035] The present invention uses two sets of wheels to travel and turn on the rails 6, wherein a handrail is provided on the vehicle frame 11, and the small ballast cleaning equipment is pushed to travel on the rails 6 with manual assistance.

[0036] like Figure 2 , 4 -6, the horizontal moving device 2 includes a guide rail 21, a slider 22, a limit block 23 and a support plate 24. There are two guide rails 21, the two guide rails are parallel and perpendicular to the steel rails, the guide rails are fixed to the frame 11 by screws, each guide rail is slidably connected with at least one slider 22, and both ends of the guide rails are provided with limit blocks to prevent the slider from falling off, and the top ends of the sliders of the two guide rails are connected to the support plate 24 by screws, and the support plate is located between the two guide rails. The support lifting device 3, the steering device 4 and the ballast cleaning device 5 are fixedly connected to the support plate 24.

[0037] like Figure 2 , 6 The lifting device 3 includes a column 31, a rotating support seat 32, a column end cover 33, an elevator base 34, a three-phase asynchronous motor 35, a coupling 36 and a worm screw elevator 37. The bottom end of the column 31 is fixedly connected to the support plate 24, the elevator base is slidably sleeved on the column, the top of the column is connected to the column end cover 33, and the column end cover is connected to the elevator base 34. The three-phase asynchronous motor 35 and the worm screw elevator 37 are fixedly arranged on the elevator base 34. The elevator base 34 plays a supporting role for the three-phase asynchronous motor 35 and the worm screw elevator 37. The output shaft of the three-phase asynchronous motor 35 is connected to the input shaft of the worm screw elevator 37 through the coupling 36. The screw of the worm screw elevator is parallel to the column, and the lower end of the screw is threadedly connected to the rotating support seat 32. A limit block is set at one end of the screw below the rotating support seat 32 to prevent the screw from being separated from the connection with the rotating support seat 32.

[0038] The rotating support seat 32 is provided with a threaded hole, in which the screw on the worm gear screw elevator 37 is spirally driven, and the forward and reverse rotation of the three-phase asynchronous motor 35 drives the elevator screw to rotate, thereby driving the rotating support seat 32 together with the steering device 4 and the ballast cleaning device 5 to move up and down along the column, wherein the column 31 and the rotating support seat 32 are clearance-matched to play a guiding and supporting role.

[0039] like Figure 2 , 46. The steering device 4 includes a bogie 41, a rotary support bearing 42 and a locking mechanism 43. The outer ring of the rotary support bearing 42 is connected to the rotary support seat 32, the inner ring of the rotary support bearing 42 is connected to the flange of the reducer 52 of the ballast cleaning device 5, and the bogie 41 is fixedly connected to the flange of the reducer 52. The locking mechanism 43 includes a locking seat 431, a connecting rod 432 and a cylindrical pin 433. The locking seat 431 is fixedly connected to the rotary support seat 32. One end of the connecting rod 432 is hinged to the locking seat 431, and the other end is provided with a threaded hole for the cylindrical pin to pass through. The threaded hole matches the threaded hole on the bogie 41. By inserting the cylindrical pin 433 into the threaded holes of the connecting rod and the bogie, the locking seat 431, the connecting rod and the bogie are fixedly connected.

[0040] like Figure 2-4 7. The ballast removal device 5 includes a motor 51, a reducer 52, a coupling protective sleeve 53, a coupling 2 54, a transmission shaft 55, a transmission shaft protective sleeve 56, a blade 57 and a ballast removal mechanism 58. The motor 51 is connected to the reducer 52, and the reducer is connected to the transmission shaft 55 through the coupling 2. The other end of the transmission shaft 55 is rotatably connected to the driving sprocket 581 of the ballast removal mechanism. The flange of the reducer 52 is fixed on the inner ring of the rotating support bearing 42, the upper end of the coupling protective sleeve 53 is fixed on the flange of the reducer 52, the lower end of the coupling protective sleeve 53 is connected to the power shaft protective sleeve 56, the coupling is located in the coupling protective sleeve, the power shaft is located in the power shaft protective sleeve 56, and the lower end of the power shaft protective sleeve 56 is fixedly connected to the blade. The ballast removal mechanism includes a driving sprocket 581, a driven sprocket 582, a supporting wheel 583, a chain 584 and a rake claw 585, wherein the driven sprocket 582 and the supporting wheel 583 are mounted on the blade 57, the driving sprocket is rotatably mounted on the transmission shaft, the driving sprocket is connected with the driven sprocket 582 and the supporting wheel 583 through the chain 584, and the supporting wheel is located between the driving sprocket and the driven sprocket. The rake claw 585 is mounted on the chain, and the chain 584 is a roller chain.

[0041] The supporting wheel 583 is installed on the blade plate 57, and is located between the driving sprocket and the driven sprocket to prevent the chain from being dragged.

[0042] The rake claw 585 includes rake teeth and a rake plate, wherein the rake teeth are used for cutting and the rake plate is used for transporting ballast.

[0043] The blade plate 57 includes an upper blade plate and a lower blade plate, and the upper blade plate and the lower blade plate are connected into a whole by long bolts.

[0044] Furthermore, there are disks on the driving sprocket 581 and the driven sprocket 582, which can also prevent the chain from coming off.

[0045] When the worker presses the forward switch of the three-phase asynchronous motor 35, the three-phase asynchronous motor 35 is connected to the input shaft of the worm gear screw lift 37 through the coupling 36. The worm gear screw lift 37 has the function of changing the transmission direction and reducing the speed. It is a prior art and can be purchased and obtained, so it is not described here. The ballast removal device 5 is installed on the rotating support seat 32. The worm gear screw lift 37 rotates so that the ballast removal device 5 can move downward to the specified position for ballast removal.

[0046] When the ballast cleaning mechanism 58 is located at the specified position, the second worker slowly rotates the bogie 41, the lower base plate of the bogie 41 is screwed to the lower flange of the reducer 52, the lower flange of the reducer 52 is screwed to the inner ring of the rotating support bearing 42, the outer ring of the rotating support bearing 42 is screwed to the rotating support seat 32, the inner and outer rings of the rotating support bearing 42 have threaded holes and the inner ring height is higher than the outer ring. It is a purchased part and will not be described in detail here. The lower flange of the reducer 52 is screwed to the upper part of the coupling protection sleeve 53, the lower part of the coupling protection sleeve 53 is bolted to the upper part of the transmission shaft protection sleeve 55, the lower part of the transmission shaft protection sleeve 55 is bolted to the knife plate 57, and the ballast cleaning mechanism 58 is installed on the knife plate. In summary, when the second worker rotates the bogie 41, the ballast cleaning mechanism 58 will rotate accordingly.

[0047] The second worker slowly rotates the bogie 41, and the rake claws 585 in the ballast removal mechanism 58 come into contact with the ballast, and the rake teeth begin to cut the ballast under the sleepers 7, and the ballast is transported to the cleaned area between the two sleepers 7 through the action of the rake plate. When the bogie 41 rotates to a certain angle, the second worker locks and fixes the bogie through the locking mechanism 43, so that the ballast removal mechanism 58 can operate at a suitable angle. One end of the connecting rod 432 of the locking mechanism 43 is hinged to the locking seat 431, and can rotate relatively.

[0048] After the bogie is locked, the worker slowly pushes the column 31 along the direction of the sleeper 7, so that the ballast removal mechanism 58 can clean the remaining ballast on the sleeper 7. The lifting device 3, the steering device 4, and the ballast removal device 5 are installed on the support seat 24 in the horizontal moving device 2, the support seat 24 is screwed to the slider 22, the slider 22 slides on the guide rail 21, and the guide rail 21 is screwed to the frame 11. When the worker pushes the column 31, the ballast removal mechanism 58 can be operated along the direction of the sleeper.

[0049] When the ballast cleaning mechanism 58 completes the cleaning of the ballast under one sleeper 7, the second worker pulls out the cylindrical pin 433, unlocks the locking mechanism 43, rotates the bogie 41 to a certain angle and then locks the bogie 41 to clean the ballast under the adjacent sleepers 7. After the cleaning is completed, the locking mechanism 43 is unlocked, and the ballast cleaning mechanism 58 is returned to the initial lower position (between the two sleepers). The first worker presses the reverse switch of the three-phase asynchronous motor 35, and the lifting device 3 lifts the ballast cleaning device 5 and the steering device 4 on the rotating support seat 32 upward to a certain height. The first worker continues to push the handrail on the frame 11 to make the small ballast cleaning equipment move forward along the rail 6, and cooperates with the second worker to clean the ballast under the next two sleepers 7 until the specified ballast cleaning operation is completed.

Claims

1. A small device for cleaning ballast under railway sleepers, characterized in that: It includes a car body, a horizontal moving device, a lifting device, a steering device and a ballast removal device; The vehicle body includes a frame and a wheelset, the frame is fixedly connected to the wheelset, and the wheelset moves on the railway rails; The horizontal moving device includes a guide rail, a slider, a limit block and a support plate. There are two guide rails, which are parallel and perpendicular to the steel rails. The guide rails are fixed to the frame. Each guide rail is slidably connected to at least one slider. Limit blocks are provided at both ends of the guide rails to prevent the slider from falling off. The support plate is connected to the top of the sliders of the two guide rails, and the support plate is located between the two guide rails. The lifting device includes a column, a rotating support seat, a column end cover, an elevator base, a three-phase asynchronous motor, a coupling 1 and a worm gear screw elevator; the bottom end of the column is fixedly connected to the support plate, the elevator base is slidably sleeved on the column, the top end of the column is connected to the column end cover, the column end cover is connected to the elevator base, the three-phase asynchronous motor and the worm gear screw elevator are both fixed on the elevator base, the output shaft of the three-phase asynchronous motor is connected to the input shaft of the worm gear screw elevator through a coupling 1, the screw of the worm gear screw elevator is parallel to the column, and the lower end of the screw is threadedly connected to the rotating support seat, and a limit block is provided at one end of the screw below the rotating support seat; The steering device comprises a bogie and a rotary support bearing, the outer ring of the rotary support bearing is connected to the rotary support seat, the inner ring of the rotary support bearing is connected to the flange of the reducer of the ballast cleaning device, and the bogie is fixedly connected to the flange of the reducer; The ballast cleaning device includes a motor, a reducer, a second coupling, a transmission shaft and a ballast cleaning mechanism; the motor is connected to the reducer, the reducer is connected to the transmission shaft through the second coupling, the other end of the transmission shaft is rotatably connected to the driving sprocket of the ballast cleaning mechanism, the ballast cleaning mechanism includes a driving sprocket, a driven sprocket, a chain and a rake claw, the driving sprocket is connected to the driven sprocket through the chain, and the rake claw is installed on the chain; The steering device also includes a locking mechanism, which includes a locking seat, a connecting rod and a cylindrical pin. The locking seat is fixedly connected to the rotating support seat. One end of the connecting rod is hinged to the locking seat, and the other end is provided with a threaded hole for the cylindrical pin to pass through. The threaded hole matches the threaded hole on the bogie. The locking seat, the connecting rod and the bogie are fixedly connected by inserting the cylindrical pin into the threaded holes of the connecting rod and the bogie. Worker 2 slowly rotates the bogie, and the rake claws in the ballast cleaning mechanism come into contact with the ballast, and the rake teeth begin to cut the ballast under the sleepers. The ballast is transported to the cleaned area between the two sleepers through the action of the rake plate. When the bogie rotates to a certain angle, Worker 2 locks and fixes the bogie through the locking mechanism, so that the ballast cleaning mechanism can operate at a suitable angle. After the bogie is locked, the worker slowly pushes the column along the direction of the sleeper to enable the ballast removal mechanism to clean the remaining ballast on the sleeper. When the ballast cleaning mechanism completes the cleaning of the ballast under one sleeper, Worker 2 pulls out the cylindrical pin, unlocks the locking mechanism, rotates the bogie to a certain angle and then locks the bogie to clean the ballast under the adjacent sleepers. After the cleaning is completed, the locking mechanism is unlocked and the ballast cleaning mechanism is returned to the middle of the two sleepers. Worker 1 presses the reverse switch of the three-phase asynchronous motor, and the lifting device lifts the ballast cleaning device and the steering device on the rotating support seat to a certain height. Worker 1 continues to push the handrail on the frame to make the small ballast cleaning equipment move forward along the rails and cooperate with Worker 2 to clean the ballast under the next two sleepers until the specified ballast cleaning operation is completed.

2. A small device for cleaning ballast under sleepers as claimed in claim 1, characterized in that: The vehicle body also includes an axle, a bearing seat, a bearing and a frame connecting piece. The wheel set includes two groups, each wheel set includes two wheels, and the two wheels are respectively pressed on both ends of the axle. The axle located on the outside of the wheelset is rotatably connected to the bearing, and the bearing is located in the bearing seat. The frame connecting piece is fixedly connected to the bearing seat, the frame connecting piece is perpendicular to the axle, and the frame connecting piece is tightly connected to the bottom surface of the frame.

3. A small device for cleaning ballast under sleepers as claimed in claim 1, characterized in that: The ballast cleaning mechanism also includes a supporting wheel. The driving sprocket is connected to the driven sprocket and the supporting wheel through a chain, and the supporting wheel is located between the driving sprocket and the driven sprocket.

4. A small device for cleaning ballast under sleepers as claimed in claim 3, characterized in that: The chain is a roller chain.

5. A small device for cleaning ballast under sleepers as claimed in claim 3, characterized in that: The ballast cleaning device also includes a knife plate, and a driven sprocket and a supporting wheel are mounted on the knife plate.

6. A small device for cleaning ballast under sleepers as claimed in claim 5, characterized in that: The ballast cleaning device also includes a coupling protective sleeve and a transmission shaft protective sleeve. The upper end of the coupling protective sleeve is fixed on the reducer flange, and the lower end of the coupling protective sleeve is connected to the transmission shaft protective sleeve. The coupling is located in the coupling protective sleeve, the transmission shaft is located in the transmission shaft protective sleeve, and the lower end of the transmission shaft protective sleeve is fixedly connected to the knife plate.

Images