A device for measuring the thickness of sludge in coal mine water tank

Abstract

The invention relates to the technical field of thickness measurement, and specifically discloses a device for measuring the thickness of sludge in a coal mine water bunker, comprising: a bunker chamber, a conveying frame connected to the side of the bunker chamber through a bracket, a belt arranged inside the conveying frame, and a bucket fixed on the surface of the belt; and further comprising: a distribution component, the distribution component being arranged inside the bunker chamber, the distribution component comprising a distribution pipe 1 and a distribution pipe 2, a delivery pump 1 being arranged inside the distribution pipe 1, and the discharge of water-coal sludge is assisted by the delivery pump 1, and a delivery pump 2 being arranged inside the distribution pipe 2, and the discharge of sludge is assisted by the delivery pump 2; a water-coal sludge layer and a sludge layer are discharged in time according to the thickness, the stratified extraction of the water-coal sludge layer and the sludge layer is realized, and the subsequent steps of extracting the water-coal sludge separately are reduced. At the same time, the content of the water-coal sludge and sludge to be entered into the bunker chamber is predicted in advance, and the discharge of the water-coal sludge layer and the sludge layer is controlled in advance according to the predicted signal, which is conducive to the rapid discharge of the water-coal sludge layer and the sludge layer, and the discharge speed is improved.

Description

Technical Field

[0001] The invention relates to the technical field of thickness measurement, in particular to a device for measuring the thickness of sludge in a coal mine water tank. Background Art

[0002] The coal mine silo sludge thickness measuring device is a special equipment used to measure the silt thickness in the coal mine silo. The accumulation of silt in the coal mine silo will affect the volume and drainage efficiency of the silo. If the silt accumulates too much, it may cause poor drainage of the sludge in the silo. By measuring the thickness of the silt, the drainage capacity of the silo and the accumulation of silt can be understood in time, so as to take corresponding cleaning measures to ensure the safe production of the mine. In addition, by comparing the silt thickness data in different time periods, the accumulation speed and trend of the silt can be understood, so as to formulate a reasonable silt cleaning plan and drainage plan.

[0003] During the clearing process, the silt and water-coal slime transported by the bucket are transported to the silt conveying pump, and then the conveying pump pressurizes and transports the silt to the pipeline to complete the transportation of the silo. In the storage bin, the silt and water-coal slime are mixed together. In subsequent processing, it may be necessary to extract the water-coal slime separately for recycling and reuse. However, extracting the water-coal slime separately for recycling increases the operating steps, affects the extraction speed of the transportation pipeline, and delays the extraction process. For this reason, we propose a coal mine water silo silt thickness measuring device. Summary of the invention

[0004] The purpose of the present invention is to provide a device for measuring the thickness of coal mine silo sludge to solve the problem that the separate extraction of water-coal sludge for recycling proposed in the above background technology increases the operation steps, affects the extraction speed of the transportation pipeline, and delays the extraction process.

[0005] To achieve the above object, the present invention provides the following technical solution: a device for measuring the thickness of sludge in a coal mine water silo, comprising: a chamber, a conveying frame connected to the side of the chamber through a bracket, a belt arranged inside the conveying frame, and a bucket fixed on the surface of the belt;

[0006] The invention also includes: a distribution component, which is arranged inside the chamber, and includes a distribution pipe 1 and a distribution pipe 2. A delivery pump 1 is arranged inside the distribution pipe 1, and the delivery pump 1 assists the discharge of the water-coal sludge. A delivery pump 2 is arranged inside the distribution pipe 2, and the delivery pump 2 assists the discharge of the sludge.

[0007] Monitoring component 1, which is arranged on a side close to the distribution pipe 1, detects the thickness of the water-coal slime layer through the monitoring component 1, and controls the delivery pump 1 to deliver the water-coal slime when the water-coal slime layer reaches the required delivery thickness;

[0008] Monitoring component 2 is arranged on one side close to the distribution pipe 2. The thickness of the sludge layer is monitored by the monitoring component 2. When the sludge reaches the required thickness for transportation, the transportation pump 2 is controlled to transport the sludge. The thickness of the water-coal sludge layer and the sludge layer are monitored by the monitoring component 1 and the monitoring component 2 respectively, and transportation is carried out in time according to the thickness.

[0009] The prediction component is arranged inside the conveying frame, and the amount of water-coal sludge and silt to be entered into the chamber is predicted by the prediction component, and the start of the conveying pump 1 or the conveying pump 2 is controlled in advance according to the predicted amount of water-coal sludge or silt.

[0010] Wherein, guide plates are fixed on both sides of the inner wall of the chamber, and the end surface of the first distribution pipe and the end surface of the second distribution pipe are respectively fixed on the two side edges of the chamber.

[0011] Among them, the monitoring component 1 includes a fixing seat 1 fixed on the bottom of the guide plate, and a distance sensor 1 is fixed on the surface of the fixing seat 1.

[0012] Wherein, a floating plate is arranged below the distance sensor 1, and the bottom of the floating plate is connected to the inner wall of the chamber through the connecting line 1.

[0013] The monitoring component 2 includes a fixing seat 2 fixed at the bottom of the guide plate, and a distance sensor 2 is fixed on the surface of the fixing seat 2.

[0014] Wherein, a gravity plate is arranged below the second distance sensor, a floating seat is fixed on the top of the gravity plate, and the bottom of the gravity plate is connected to the chamber through the second connecting line.

[0015] Among them, the prediction component includes a base fixed on the inner wall of the conveyor frame, a top plate is arranged on the top of the base, and the top of the top plate is pressed against the inner surface of the belt, a rotating ball is embedded in the surface of the top plate, and limiting plates are fixed on both sides of the bottom of the top plate, and a spring is arranged on the side of the limiting plate, one end of the spring is fixed to the top plate, and the other end of the spring is fixed to the base.

[0016] Among them, a connecting plate is fixed at the middle end of the bottom of the top plate, and a pressure block is fixed on the side of the connecting plate. A switch plate that cooperates with the pressure block is fixed on the inner wall of the base. The switch plate includes switch one and switch two. Switch one and switch two are fixed on the surface of the switch plate in sequence from top to bottom.

[0017] Among them, a scraper is provided on the inner wall of the bucket, a metal plate is fixed on the end face of the scraper, an electromagnet is provided on the side of the metal plate, a movable plate is fixed on the end face of the electromagnet, a screw is connected to the internal thread of the movable plate, one end of the screw is fixedly connected to the output shaft of the motor, and the other end of the screw is rotatably connected to the fixed frame, the end face of the motor is fixedly connected to the fixed frame, and the bottom of the fixed frame is fixed to the surface of the chamber.

[0018] Wherein, limit rods are arranged on both sides of the movable plate, and both ends of the limit rods are fixed to the fixed frame, the surface of the scraper is slidably connected with the bucket through a slider, and the surface of the bucket is provided with a notch matched with the slider.

[0019] The present invention has at least the following beneficial effects:

[0020] The heights of the water-coal slime and the silt are monitored respectively by the distance sensor 1 and the distance sensor 2, so that the controller can judge the thickness of the water-coal slime layer and the silt layer according to the height signal, discharge the water-coal slime layer and the silt layer in time according to the thickness, realize the layered extraction of the water-coal slime layer and the silt layer, reduce the subsequent steps of extracting the water-coal slime separately, save the operation steps, and at the same time, realize the advance prediction of the content of the water-coal slime and silt to be entered into the chamber through the prediction component, control the discharge of the water-coal slime layer and the silt layer in advance according to the prediction signal, facilitate the rapid discharge of the water-coal slime layer and the silt layer, and improve the discharge speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of the structure of the present invention;

[0022] Figure 2 It is a first cross-sectional view of a local structure of a chamber of the present invention;

[0023] Figure 3 It is a second cross-sectional view of the local structure of the chamber of the present invention;

[0024] Figure 4 It is a partial structural cross-sectional view of the belt of the present invention;

[0025] Figure 5 It is a schematic cross-sectional view of the local structure of the prediction component of the present invention;

[0026] Figure 6 It is a partial structural schematic diagram of the switch board of the present invention;

[0027] Figure 7 This is a structural diagram of Embodiment 2 of the present invention;

[0028] Figure 8 For the present invention Figure 7 A local enlarged schematic diagram of the middle A;

[0029] Fig. 9 It is a schematic diagram of the local structure of the screw of the present invention.

[0030] In the figure: 11, chamber; 12, bracket; 13, conveyor frame; 14, belt; 15, bucket; 2, distribution assembly; 21, guide plate; 22, distribution pipe 1; 23, distribution pipe 2; 3, monitoring assembly 1; 31, fixed seat 1; 32, distance sensor 1; 33, floating plate; 34, connecting line 1; 4, monitoring assembly 2; 41, fixed seat 2; 42, distance sensor 2; 43, gravity plate; 44, floating seat ; 45. Connecting line 2; 5. Prediction assembly; 51. Base; 52. Top plate; 53. Limit plate; 54. Spring; 55. Connecting plate; 56. Pressure block; 57. Turning ball; 58. Switch plate; 581. Switch 1; 582. Switch 2; 61. Scraper; 62. Metal plate; 63. Electromagnet; 64. Screw; 65. Motor; 66. Fixed frame; 67. Limit rod; 68. Moving plate; 69. Slider. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1

[0033] See also Figures 1 to 6 The present invention provides a technical solution: a device for measuring the thickness of sludge in a coal mine water silo, comprising: a chamber 11, a side of the chamber 11 is connected to a conveying frame 13 through a bracket 12, a belt 14 is arranged inside the conveying frame 13, and a bucket 15 is fixed on the surface of the belt 14;

[0034] The invention also includes: a distribution assembly 2, which is arranged inside the chamber 11, and includes a distribution pipe 1 22 and a distribution pipe 2 23. A delivery pump 1 is arranged inside the distribution pipe 1 22, and the delivery pump 1 assists the discharge of the water-coal sludge. A delivery pump 2 is arranged inside the distribution pipe 23, and the delivery pump 2 assists the discharge of the sludge.

[0035] Monitoring component 3 is arranged at a side close to the distribution pipe 22. The thickness of the water-coal slurry layer is detected by the monitoring component 3. When the water-coal slurry layer reaches the required conveying thickness, the conveying pump 1 is controlled to convey the water-coal slurry.

[0036] The monitoring component 3 includes a fixing seat 31 fixed at the bottom of the guide plate 21, and a distance sensor 32 is fixed on the surface of the fixing seat 31. The height of the water-coal slime is monitored by the distance sensor 32, so that the controller can judge the thickness of the water-coal slime layer according to the height signal and discharge the water-coal slime layer in time according to the thickness.

[0037] A floating plate 33 is provided below the distance sensor 32, and the bottom of the floating plate 33 is connected to the inner wall of the chamber 11 through a connecting line 34. The water-coal slime layer floats the floating plate 33, and the height of the floating plate 33 is monitored by the distance sensor 32. The height of the water-coal slime layer is judged according to the height of the floating plate 33, and the height signal of the water-coal slime layer is transmitted to the controller, which is beneficial for the controller to control the operation of the delivery pump 1 according to the signal.

[0038] Monitoring component 2 4 is arranged on one side close to distribution pipe 2 23. The thickness of the sludge layer is monitored by monitoring component 2 4. When the sludge reaches the required conveying thickness, conveying pump 2 is controlled to convey the sludge. The thickness of the water-coal sludge layer and the sludge layer are monitored respectively by monitoring component 1 3 and monitoring component 2 4, and conveying is carried out in time according to the thickness.

[0039] The monitoring component 24 includes a fixing seat 241 fixed at the bottom of the guide plate 21, and a distance sensor 242 is fixed on the surface of the fixing seat 241. The distance sensor 242 monitors the height of the sludge, so that the controller can judge the thickness of the sludge layer according to the sludge height and discharge the sludge in time according to the thickness.

[0040] Distance sensor 1 32 and distance sensor 2 42 both use ultrasonic sensors to monitor distance. The floating plate 33 floats on the water-coal slime layer, and the gravity plate 43 and the floating seat 44 are suspended in the water-coal slime layer and float above the silt layer. The two ultrasonic sensors monitor the distance between the floating plate 33 and the floating seat 44 in turn to monitor the depth of the water-coal slime layer and the depth of the silt layer. The ultrasonic sensor can penetrate the water-coal slime layer until it reaches the position of the floating seat 44.

[0041] A gravity plate 43 is provided below the distance sensor 42, and a floating seat 44 is fixed on the top of the gravity plate 43. The bottom of the gravity plate 43 is connected to the chamber 11 through a connecting line 45. Under the action of the gravity plate 43, the gravity plate 43 drives the floating seat 44 to sink, and the gravity plate 43 floats on the surface of the sludge layer, so that the gravity plate 43 can float on the surface of the high-density sludge. The height of the floating seat 44 is monitored by the distance sensor 42, and the height of the sludge layer is judged according to the height of the floating seat 44, and the height signal of the sludge layer is transmitted to the controller, which is beneficial for the controller to control the operation of the delivery pump 2 according to the signal.

[0042] The prediction component 5 is arranged inside the conveying frame 13. The prediction component 5 predicts the amount of water-coal sludge and silt to be introduced into the chamber 11, and controls the start of the conveying pump 1 or the conveying pump 2 in advance according to the predicted amount of water-coal sludge or silt.

[0043] The prediction component 5 includes a base 51 fixed to the inner wall of the conveying frame 13, a top plate 52 is provided on the top of the base 51, and the top of the top plate 52 is pressed against the inner surface of the belt 14, a rotating ball 57 is embedded in the surface of the top plate 52, and limiting plates 53 are fixed on both sides of the bottom of the top plate 52, and a spring 54 is provided on the side of the limiting plate 53, one end of the spring 54 is fixed to the top plate 52, and the other end of the spring 54 is fixed to the base 51, and the rotating ball 57 is tightly pressed against the inner wall of the belt 14, and the rotating ball 57 is pushed by the spring 54 to make it close to the belt 14. The design of the rotating ball 57 reduces the friction between the top plate 52 and the belt 14. When the bucket 15 moves to a position close to the prediction component 5, the greater the weight of the bucket 15, the greater the squeezing force of the bucket 15 on the top plate 52, the density of the sludge is greater than the density of the water-coal slime, and the higher the sludge content inside the bucket 15, the heavier the weight of the bucket 15.

[0044] Guide plates 21 are fixed on both sides of the inner wall of the chamber 11, and the end faces of the distribution pipe 1 22 and the end faces of the distribution pipe 2 23 are respectively fixed on the two side edges of the chamber 11. The guide plates 21 are used to guide the water-coal sludge and silt to enter the chamber 11, which is beneficial for the water-coal sludge and silt to enter the chamber 11.

[0045] A connecting plate 55 is fixed to the middle end of the bottom of the top plate 52, and a pressing block 56 is fixed to the side of the connecting plate 55. A switch plate 58 cooperating with the pressing block 56 is fixed to the inner wall of the base 51. The switch plate 58 includes a switch 1 581 and a switch 2 582. The switch 1 581 and the switch 2 582 are fixed on the surface of the switch plate 58 in sequence from top to bottom. When the top plate 52 is indirectly squeezed by the bucket 15, under the action of gravity, the bucket 15 drives the belt 14 to squeeze the surface of the top plate 52. The top plate 52 moves downward after being squeezed, and the top plate 52 drives the pressing block 56 to move downward synchronously through the connecting plate 55.

[0046] When the water-coal slurry content inside the bucket 15 is relatively high, the downward movement of the top plate 52 is relatively small, and the pressure block 56 is connected to the switch 1 581. When the switch 1 581 receives the pressing signal, the conveying pump is controlled to start working, and the prediction operation of the amount of water-coal slurry to be discharged is realized. For example, when the water-coal slurry needs to reach "10", the conveying pump 1 is started. However, when the water-coal slurry reaches "8", if the switch 1 581 continuously monitors the pressing signal, the conveying pump 1 is started in advance, because after the water-coal slurry to be entered into the chamber 11 enters the chamber 11, the water-coal slurry content inside the chamber 11 reaches "10", which meets the starting standard of the conveying pump 1.

[0047] When the sludge content inside the bucket 15 is relatively high, the downward position of the top plate 52 is relatively large, and the pressure block 56 is connected to the switch 2 582. When the switch 2 582 receives the pressing signal, the conveying pump 2 is controlled to start working, so as to realize the prediction operation of the amount of sludge to be discharged. For example, when the sludge needs to reach "3", the conveying pump 2 is started. However, when the water-coal sludge reaches "2", if the switch 2 582 continuously monitors the pressing signal, the conveying pump 2 is started in advance, because after the sludge to be entered into the chamber 11 enters the chamber 11, the sludge content inside the chamber 11 reaches "3", which meets the starting standard of the conveying pump 2. Through the design of the above-mentioned prediction component 5, the content of water-coal sludge or sludge is predicted in advance, so as to control the start of the conveying pump 1 or the conveying pump 2 in advance, and accelerate the discharge process of the water-coal sludge and sludge.

[0048] Embodiment 2

[0049] See also Figures 7 to 9 The inner wall of the bucket 15 is provided with a scraper 61, a metal plate 62 is fixed to the end face of the scraper 61, an electromagnet 63 is provided on the side of the metal plate 62, a movable plate 68 is fixed to the end face of the electromagnet 63, a screw 64 is connected to the inner thread of the movable plate 68, one end of the screw 64 is fixedly connected to the output shaft of the motor 65, the other end of the screw 64 is rotatably connected to the fixing frame 66, the end face of the motor 65 is fixedly connected to the fixing frame 66, the bottom of the fixing frame 66 is fixed to the surface of the chamber 11, when the bucket 15 is transferred to a position close to the fixing frame 66, and the belt 14 stops During transportation, the electromagnet 63 is energized, and an adsorption force is generated after the electromagnet 63 is energized. The electromagnet 63 adsorbs the metal plate 62. Subsequently, the motor 65 starts to work, and the motor 65 drives the screw 64 to rotate. The screw 64 rotates, so that the movable plate 68 moves on the outer wall of the screw 64, and the movable plate 68 drives the electromagnet 63 to move synchronously. The electromagnet 63 drives the metal plate 62 to move synchronously. The metal plate 62 drives the scraper 61 to move synchronously. The scraper 61 slides on the inner wall of the bucket 15, and the sludge remaining on the inner wall of the bucket 15 is scraped off by the scraper 61, which is beneficial to the cleaning of the residual sludge.

[0050] Limiting rods 67 are provided on both sides of the movable plate 68, and both ends of the limiting rods 67 are fixed to the fixed frame 66. The surface of the scraper 61 is slidably connected to the bucket 15 through a slider 69. The surface of the bucket 15 is provided with a recess that cooperates with the slider 69. The limiting rods 67 are used to limit the two sides of the movable plate 68, so that the movement of the movable plate 68 is more stable. When the scraper 61 moves, the slider 69 is driven to move synchronously. The movement of the scraper 61 is limited by the slider 69, so that the movement of the scraper 61 is more stable, which is beneficial for the scraper 61 to scrape off the silt remaining on the inner wall of the bucket 15.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for measuring the thickness of sludge in a coal mine water tank, comprising: A chamber (11), wherein a side of the chamber (11) is connected to a conveying frame (13) via a bracket (12), a belt (14) is provided inside the conveying frame (13), and a bucket (15) is fixed on the surface of the belt (14); It is characterized by: also including: A distribution assembly (2), the distribution assembly (2) being arranged inside the chamber (11), the distribution assembly (2) comprising a first distribution pipe (22) and a second distribution pipe (23), a first delivery pump being arranged inside the first distribution pipe (22), and assisting in the discharge of the water-coal sludge by means of the first delivery pump, and a second delivery pump being arranged inside the second distribution pipe (23), and assisting in the discharge of the sludge by means of the second delivery pump; A monitoring component one (3), wherein the monitoring component one (3) is arranged on a side close to the distribution pipe one (22), and the thickness of the coal-water slurry layer is detected by the monitoring component one (3). When the coal-water slurry layer reaches a required conveying thickness, the conveying pump one is controlled to convey the coal-water slurry; The monitoring component 2 (4) is arranged on a side close to the distribution pipe 2 (23), and the thickness of the sludge layer is monitored by the monitoring component 2 (4). When the sludge reaches the required delivery thickness, the delivery pump 2 is controlled to deliver the sludge. The thickness of the water-coal sludge layer and the sludge layer are monitored by the monitoring component 1 (3) and the monitoring component 2 (4), respectively, and delivery is carried out in a timely manner according to the thickness; A prediction component (5), the prediction component (5) being arranged inside the conveying frame (13), predicting the amount of coal-water sludge and sludge to be introduced into the chamber (11) through the prediction component (5), and controlling the start of the conveying pump 1 or the conveying pump 2 in advance according to the predicted amount of coal-water sludge or sludge; The prediction component (5) comprises a base (51) fixed to the inner wall of the conveyor frame (13), a top plate (52) is arranged on the top of the base (51), and the top of the top plate (52) is pressed against the inner surface of the belt (14), a rotating bead (57) is embedded in the surface of the top plate (52), and limiting plates (53) are fixed on both sides of the bottom of the top plate (52), and a spring (54) is arranged on the side of the limiting plate (53), one end of the spring (54) is fixed to the top plate (52), and the other end of the spring (54) is fixed to the base (51); A connecting plate (55) is fixed to the middle end of the bottom of the top plate (52), and a pressing block (56) is fixed to the side of the connecting plate (55); a switch plate (58) cooperating with the pressing block (56) is fixed to the inner wall of the base (51); the switch plate (58) comprises a switch 1 (581) and a switch 2 (582); the switch 1 (581) and the switch 2 (582) are fixed to the surface of the switch plate (58) in sequence from top to bottom.

2. The device for measuring the thickness of coal mine sump sludge according to claim 1, characterized in that: Guide plates (21) are fixed on both sides of the inner wall of the chamber (11), and the end surface of the first distribution pipe (22) and the end surface of the second distribution pipe (23) are respectively fixed on the two side edges of the chamber (11).

3. The device for measuring the thickness of coal mine sump sludge according to claim 2, characterized in that: The monitoring component one (3) comprises a fixing seat one (31) fixed to the bottom of the guide plate (21), and a distance sensor one (32) is fixed on the surface of the fixing seat one (31).

4. The device for measuring the thickness of coal mine sump sludge according to claim 3, characterized in that: A floating plate (33) is provided below the first distance sensor (32), and the bottom of the floating plate (33) is connected to the inner wall of the chamber (11) via a first connecting line (34).

5. The device for measuring the thickness of coal mine sump sludge according to claim 2, characterized in that: The monitoring component 2 (4) comprises a fixing seat 2 (41) fixed to the bottom of the guide plate (21), and a distance sensor 2 (42) is fixed to the surface of the fixing seat 2 (41).

6. The device for measuring the thickness of coal mine sump sludge according to claim 5, characterized in that: A gravity plate (43) is provided below the second distance sensor (42), and a floating seat (44) is fixed on the top of the gravity plate (43). The bottom of the gravity plate (43) is connected to the chamber (11) via a second connecting line (45).

7. The device for measuring the thickness of coal mine sump sludge according to claim 1, characterized in that: The inner wall of the bucket (15) is provided with a scraper (61), a metal plate (62) is fixed to the end surface of the scraper (61), an electromagnet (63) is provided on the side of the metal plate (62), a movable plate (68) is fixed to the end surface of the electromagnet (63), a screw (64) is connected to the internal thread of the movable plate (68), one end of the screw (64) is fixedly connected to the output shaft of the motor (65), the other end of the screw (64) is rotatably connected to a fixed frame (66), the end surface of the motor (65) is fixedly connected to the fixed frame (66), and the bottom of the fixed frame (66) is fixed to the surface of the chamber (11).

8. The device for measuring the thickness of coal mine sump sludge according to claim 7, characterized in that: Limiting rods (67) are provided on both sides of the movable plate (68), and both ends of the limiting rods (67) are fixed to the fixing frame (66). The surface of the scraper (61) is slidably connected to the bucket (15) via a slider (69), and a recess that cooperates with the slider (69) is provided on the surface of the bucket (15).

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