Slag removal device

Abstract

The utility model provides a slag removing device which is arranged on a bottom plate of a coal mine tunnel, the slag removing device comprises a body and a slag removing device, the body is provided with a collecting cavity and a cleaning cavity which are communicated with each other, the collecting cavity is located on the side, close to the side wall of the coal mine tunnel, of a sealing-tape machine and located below the sealing-tape machine, and the cleaning cavity is located on the side, away from the side wall of the coal mine tunnel, of the collecting cavity; the scraping plate is provided with an avoiding position and a cleaning position which are oppositely arranged, when the scraping plate is located at the avoiding position, the scraping plate is located on the side, close to the side wall of the coal mine roadway, of the collecting cavity, and when the scraping plate is switched to the cleaning position, coal cinder in the collecting cavity is driven to move towards the cleaning cavity; the scraping plate can be driven by the driving assembly to be switched between the avoiding position and the cleaning position. By means of the technical scheme, the problem that in the prior art, scattered slag on the side, close to the roadway side wall, of an adhesive tape machine is not easy to clean can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mining, in particular to a slag cleaning device. Background Art

[0002] During production at the comprehensive mining face of a coal mine, as the tail of the self-moving machine moves forward every day, an error may occur between the center line of the tail of the self-moving machine and the center line of the belt conveyor laid in the tunnel. When the tail of the self-moving machine deviates to the side of the belt conveyor away from the inner wall of the tunnel, slag will be scattered on the side of the belt conveyor away from the inner wall of the tunnel. The side of the belt conveyor away from the inner wall of the tunnel is a personnel passage, and it is convenient to clean up the scattered slag. However, when the tail of the self-moving machine deviates to the side of the belt conveyor close to the inner wall of the tunnel, the scattered slag will accumulate between the inner wall of the tunnel and the belt conveyor. The space here is small, and it is not easy for personnel to clean up the scattered slag here. When the scattered slag is full, it will wear out the running belt and affect the service life of the belt. In addition, the heat generated when the scattered slag wears the belt can easily cause fire accidents and create safety hazards. Utility Model Content

[0003] The utility model provides a slag cleaning device to solve the problem that the slag scattered on the side of the belt conveyor close to the side wall of the tunnel in the prior art is difficult to clean.

[0004] The utility model provides a slag cleaning device, which is arranged on the bottom plate of a coal mine tunnel, and comprises: a main body, provided with a collecting chamber and a cleaning chamber which are connected with each other, the collecting chamber is located at a side of a belt conveyor close to a side wall of the coal mine tunnel and below the belt conveyor, and the cleaning chamber is located at a side of the collecting chamber away from the side wall of the coal mine tunnel; a scraper which is movably arranged in the collecting chamber, and the scraper has a relatively arranged avoidance position and a cleaning position, when the scraper is in the avoidance position, the scraper is located at a side of the collecting chamber close to the side wall of the coal mine tunnel, when the scraper is switched to the cleaning position, the scraper can move from a side of the collecting chamber close to the side wall of the coal mine tunnel to a side of the collecting chamber away from the side wall of the coal mine tunnel, so as to drive the coal slag in the collecting chamber to move toward the cleaning chamber; a driving component which is arranged on the main body, the driving component is connected to the scraper driving, and the scraper can be switched between the avoidance position and the cleaning position under the drive of the driving component.

[0005] Furthermore, the main body includes: a base and multiple baffles, the base has a first end and a second end relatively set along the moving direction of the scraper, the collecting chamber and the cleaning chamber are distributed on the base along the moving direction of the scraper, the collecting chamber is arranged close to the first end, and baffles are arranged on the second end of the base and on both sides of the base, the baffles are hinged to the base, the baffles have a relatively set expanded state and an enclosure state, when the multiple baffles are in the enclosure state, the multiple baffles cooperate to enclose the cleaning chamber.

[0006] Furthermore, the slag cleaning device also includes a connecting piece, and when the baffle is in the enclosing state, two adjacent baffles are detachably connected to the connecting piece.

[0007] Furthermore, the connector has two mutually perpendicular plug-in slots, the plug-in slots and the baffles are arranged in one-to-one correspondence, the extension direction of the plug-in slots is the same as the extension direction of the corresponding baffles, and the baffles are inserted in the corresponding plug-in slots.

[0008] Furthermore, in the vertical direction, the distance from the scraper to the second end gradually increases from the bottom to the top of the collecting chamber.

[0009] Furthermore, in the vertical direction, the distance from the side wall of the collecting chamber close to the second end to the second end gradually decreases from the bottom to the top of the collecting chamber.

[0010] Furthermore, the base includes a base plate and a collection box, the collection box has a collection cavity, a socket is provided at one end of the base plate, a plug plate is provided on the side wall of the collection box, the plug plate is plugged into the socket, a connecting hole is provided on the plug plate, and a screw hole is provided on the top of the base plate. When the plug plate is inserted into the socket, the connecting hole and the screw hole are correspondingly provided, and fixing bolts are provided in the connecting hole and the screw hole to fix the base plate and the collection box.

[0011] Furthermore, a blocking piece is provided in the screw hole to block the screw hole, and the blocking piece does not protrude from the upper surface of the substrate.

[0012] Furthermore, a guide block is arranged on the top of the substrate, and two guide blocks are arranged symmetrically along a center line extending in the width direction of the substrate, and the height of the guide block gradually decreases in the direction away from the center line.

[0013] Furthermore, the driving assembly includes: a hydraulic cylinder, which is arranged on a base plate; a connecting rod, one end of which is connected to the hydraulic cylinder, and the other end of which is connected to the scraper. The hydraulic cylinder can drive the scraper to move in the direction of the hydraulic cylinder through the connecting rod to drive the scraper to switch from the avoidance position to the cleaning position.

[0014] By applying the technical solution of the utility model, the slag cleaning device includes a main body, a scraper and a driving assembly. When the tail of the self-moving machine deviates to one side of the side wall of the coal mine tunnel, the slag that cannot fall on the belt conveyor will fall into the collecting chamber. As the tail of the self-moving machine advances, the scattered slag in the collecting chamber continues to accumulate. When it is necessary to clean the scattered slag in the collecting chamber, the scraper can be driven by the driving assembly to switch from the avoidance position to the cleaning position, driving the slag in the collecting chamber to move toward the cleaning chamber, that is, driving the scattered slag to move away from the side wall of the tunnel, so as to facilitate cleaning by the staff, prevent the accumulation of scattered slag from excessively wearing the belt conveyor, ensure the service life of the belt conveyor, and reduce the possibility of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0016] Figure 1 It shows a schematic structural diagram of the scraper of the slag cleaning device provided by the utility model when it is in the avoidance position;

[0017] Figure 2 A schematic diagram showing the structure of the slag cleaning device provided by the utility model when the baffle is in the expanded position;

[0018] Figure 3 The structure explosion diagram of the slag cleaning device provided by the utility model is shown;

[0019] Figure 4 The schematic diagram of the structure of the substrate provided by the utility model is shown;

[0020] Figure 5 The schematic diagram of the structure of the connecting piece provided by the utility model is shown.

[0021] The above drawings include the following reference numerals:

[0022] 10. Ontology;

[0023] 101. Collection chamber; 102. Cleaning chamber;

[0024] 11. base; 111. base plate; 112. collection box; 113. jack; 114. plug board; 115. connection hole; 116. screw hole; 117. blocking piece; 118. guide block;

[0025] 12. baffle; 13. connector; 131. plug-in slot;

[0026] 20. Scraper;

[0027] 30. Driving assembly; 31. Hydraulic cylinder; 32. Connecting rod. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0029] like Figure 1 As shown, the embodiment of the utility model provides a slag cleaning device, which is arranged on the bottom plate of the coal mine tunnel, and the slag cleaning device includes a body 10, a scraper 20 and a driving assembly 30. Among them, the body 10 has a collecting chamber 101 and a cleaning chamber 102 that are connected to each other, the collecting chamber 101 is located on the side of the belt conveyor close to the side wall of the coal mine tunnel, and is located below the belt conveyor, and the cleaning chamber 102 is located on the side of the collecting chamber 101 away from the side wall of the coal mine tunnel. The scraper 20 is movably arranged in the collecting chamber 101, and the scraper 20 has a relatively arranged avoidance position and a cleaning position. When the scraper 20 is in the avoidance position, the scraper 20 is located on the side of the collecting chamber 101 close to the side wall of the coal mine tunnel. When the scraper 20 is switched to the cleaning position, the scraper 20 can move from the side of the collecting chamber 101 close to the side wall of the coal mine tunnel to the side of the collecting chamber 101 away from the side wall of the coal mine tunnel, so as to drive the coal slag in the collecting chamber 101 to move to the cleaning chamber 102. The driving assembly 30 is disposed on the main body 10 , and is drivingly connected to the scraper 20 . The scraper 20 can be switched between the avoidance position and the cleaning position under the drive of the driving assembly 30 .

[0030] By applying the technical solution of the utility model, the slag cleaning device includes a main body 10, a scraper 20 and a driving assembly 30. When the tail of the self-moving machine deviates to one side of the side wall of the coal mine tunnel, the slag that cannot fall on the belt conveyor will fall into the collecting chamber 101. As the tail of the self-moving machine advances, the scattered slag in the collecting chamber 101 accumulates continuously. When it is necessary to clean the scattered slag in the collecting chamber 101, the driving assembly 30 can drive the scraper 20 to switch from the avoidance position to the cleaning position, driving the slag in the collecting chamber 101 to move toward the cleaning chamber 102, that is, driving the scattered slag to move away from the side wall of the tunnel, so as to facilitate cleaning by the staff, prevent the scattered slag from accumulating too much and wearing the belt conveyor, ensure the service life of the belt conveyor, and reduce the possibility of safety accidents.

[0031] Specifically in the present application, the body 10 includes a base 11 and a plurality of baffles 12. The base 11 has a first end and a second end that are relatively arranged along the moving direction of the scraper 20. The collecting chamber 101 and the cleaning chamber 102 are distributed on the base 11 along the moving direction of the scraper 20. The collecting chamber 101 is arranged near the first end. The second end of the base 11 and both sides of the base 11 are provided with baffles 12. The baffles 12 are hinged to the base 11. The baffles 12 have a relatively arranged expanded state and an enclosed state. When the plurality of baffles 12 are in the enclosed state, the plurality of baffles 12 cooperate to enclose the cleaning chamber 102; refer to Figure 2As shown, when the multiple baffles 12 are in the deployed position, the multiple baffles 12 are level with the top surface of the base 11. Through the above arrangement, when it is necessary to clean the scattered slag, the multiple baffles 12 can be switched to the enclosure state, so that personnel can use tools to collect the scattered slag in the cleaning chamber 102, which is convenient for personnel to operate and improves the cleaning efficiency. Specifically, when placing a slag cleaning device in the tunnel, the slag cleaning device can be pre-buried in the bottom plate so that the top surface of the slag cleaning device is level with the ground. When it is not necessary to clean the scattered slag, the multiple baffles 12 can be switched to the deployed state, and the baffles 12 will not affect the passage of personnel.

[0032] Reference Figure 1 and Figure 5 As shown, specifically in the present application, the slag cleaning device further includes a connecting piece 13, and when the baffle 12 is in the enclosure state, two adjacent baffles 12 are detachably connected to the connecting piece 13. Through the above arrangement, when it is necessary to switch multiple baffles 12 to the enclosure state, two adjacent baffles 12 can be connected by the connecting piece 13, and when it is necessary to switch multiple baffles 12 to the expanded state, the connecting piece 13 can be removed to switch multiple baffles 12 to the expanded state, thereby preventing the baffles 12 from affecting the passage of personnel and improving the convenience of operation.

[0033] In a specific embodiment of the present application, Figure 5 As shown, the connector 13 has two mutually perpendicular insertion slots 131, and the insertion slots 131 are arranged one by one with the baffle 12. The extension direction of the insertion slots 131 is the same as the extension direction of the corresponding baffle 12, and the baffle 12 is inserted in the corresponding insertion slots 131. Through the above arrangement, the insertion slots 131 can limit the baffle 12 to prevent the baffle 12 from rotating freely under the action of gravity, so as to ensure the stability of the baffle 12 when it is in the enclosure state. When the baffle 12 needs to be switched to the unfolded state, it is only necessary to remove the connector 13, and the baffle 12 can rotate naturally under the action of gravity to switch to the unfolded state, which is convenient for personnel to operate.

[0034] Specifically, in the present application, in the vertical direction, the distance from the scraper 20 to the second end gradually increases from the bottom to the top of the collection chamber 101. Through the above arrangement, the scraper 20 is inclined in the vertical direction, that is, toward the first end, so that when the scraper 20 switches from the avoidance position to the cleaning position, the slag close to the scraper 20 is not easy to fall to the outside of the collection chamber 101 during the movement of the scraper 20, further preventing the phenomenon of slag spilling during the cleaning process, and ensuring the cleaning effect.

[0035] Specifically, in the present application, the distance from the side wall of the collecting chamber 101 close to the second end to the second end gradually decreases from the bottom to the top of the collecting chamber 101. Through the above arrangement, the side wall of the collecting chamber 101 close to the second end can guide the slag in the process of the collection chamber 101 moving toward the cleaning chamber 102, preventing the side wall of the collecting chamber 101 from blocking the movement of the slag. At the same time, the design that the inner wall of the collecting chamber 101 and the scraper 20 are both inclined can prevent the slag from being stuck between the side wall of the collecting chamber 101 and the scraper 20, ensuring that the scraper 20 can be switched into place when switching to the cleaning position, thereby improving the slag cleaning effect of the slag cleaning device.

[0036] specifically refer to Figure 3 and Figure 4 As shown, the base 11 includes a base plate 111 and a collection box 112, the collection box 112 has a collection cavity 101, a socket 113 is provided at one end of the base plate 111, a plug plate 114 is provided on the side wall of the collection box 112, the plug plate 114 is plugged into the socket 113, a connecting hole 115 is provided on the plug plate 114, a screw hole 116 is provided on the top of the base plate 111, when the plug plate 114 is inserted into the socket 113, the connecting hole 115 and the screw hole 116 are correspondingly provided, and fixing bolts are provided in the connecting hole 115 and the screw hole 116 to fix the base plate 111 and the collection box 112. Through the above-mentioned arrangement, the base plate 111 and the collecting box 112 are detachably connected, so that as the self-moving machine tail is advanced, the slag collecting device can be easily disassembled and installed, so as to facilitate the transportation of the slag collecting device. By setting fastening bolts to connect the collecting box 112 and the base plate 111, the connection strength between the collecting box 112 and the base plate 111 can be ensured, loosening between the two can be prevented, and the overall structural stability of the base 11 can be ensured.

[0037] Specifically, a plurality of connection holes 115 and plugging plates 114 may be provided to further improve the connection strength between the collection box 112 and the base plate 111. The connection holes 115 and the plugging plates 114 are not limited in the present application, as long as they can meet the connection requirements.

[0038] Furthermore, a plugging piece 117 is provided in the screw hole 116 to plug the screw hole 116, and the plugging piece 117 does not protrude from the upper surface of the base plate 111. Through the above arrangement, the plugging piece 117 can stop fine coal slag from falling into the screw hole 116, preventing the need to clean the screw hole 116 when the fastening bolt needs to be removed, thereby facilitating the disassembly of the base plate 111 and the collection box 112.

[0039] Furthermore, a guide block 118 is provided on the top of the base plate 111. Two guide blocks 118 are provided. The two guide blocks 118 are symmetrically arranged along the midline extending in the width direction of the base plate 111. The height of the guide blocks 118 gradually decreases from the direction away from the midline. When the slag in the cleaning chamber 102 needs to be shoveled with a tool, the slag needs to be shoveled from the middle of the cleaning chamber 102 toward the baffle 12. Through the above arrangement, the two guide blocks 118 can guide the movement path of the tool, reduce the labor intensity of the operator, and facilitate the operator to perform construction.

[0040] Specifically in the present application, the driving assembly 30 includes a hydraulic cylinder 31 and a connecting rod 32. The hydraulic cylinder 31 is arranged on the substrate 111, one end of the connecting rod 32 is connected to the hydraulic cylinder 31, and the other end of the connecting rod 32 is connected to the scraper 20. The hydraulic cylinder 31 can drive the scraper 20 to move in the direction of the hydraulic cylinder 31 through the connecting rod 32, so as to drive the scraper 20 to switch from the avoidance position to the cleaning position. Through the above arrangement, the hydraulic cylinder 31 can overcome the large resistance, drive the scraper and slag to move to the cleaning position through the connecting rod 32, ensure the driving rod effect of the driving assembly 30 and the stability of the movement, and at the same time, the connecting rod 32 will not cause a stop to the slag falling into the collection chamber 101, thereby ensuring the collection effect of the collection chamber 101.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0043] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0044] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0045] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0046] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A slag cleaning device, characterized in that: The slag cleaning device is arranged on the bottom plate of the coal mine tunnel, and the slag cleaning device comprises: The body (10) comprises a collecting chamber (101) and a cleaning chamber (102) which are interconnected, wherein the collecting chamber (101) is located on a side of the belt conveyor close to the side wall of the coal mine tunnel and below the belt conveyor, and the cleaning chamber (102) is located on a side of the collecting chamber (101) away from the side wall of the coal mine tunnel; A scraper (20) is movably arranged in the collection chamber (101), and the scraper (20) has a relatively arranged avoidance position and a cleaning position. When the scraper (20) is in the avoidance position, the scraper (20) is located on a side of the collection chamber (101) close to the side wall of the coal mine tunnel. When the scraper (20) is switched to the cleaning position, the scraper (20) can move from a side of the collection chamber (101) close to the side wall of the coal mine tunnel to a side of the collection chamber (101) away from the side wall of the coal mine tunnel, so as to drive the coal slag in the collection chamber (101) to move toward the cleaning chamber (102); A driving assembly (30) is arranged on the body (10); the driving assembly (30) is drivingly connected to the scraper (20); and the scraper (20) can be switched between the avoidance position and the cleaning position under the drive of the driving assembly (30).

2. The slag cleaning device according to claim 1, characterized in that: The body (10) comprises: A base (11) and a plurality of baffles (12), wherein the base (11) has a first end and a second end that are relatively arranged along the moving direction of the scraper (20), the collecting chamber (101) and the cleaning chamber (102) are distributed on the base (11) along the moving direction of the scraper (20), the collecting chamber (101) is arranged close to the first end, the baffles (12) are arranged at the second end of the base (11) and on both sides of the base (11), the baffles (12) are hinged to the base (11), and the baffles (12) have a relatively arranged expanded state and an enclosing state, and when the plurality of baffles (12) are in the enclosing state, the plurality of baffles (12) cooperate to enclose the cleaning chamber (102).

3. The slag cleaning device according to claim 2, characterized in that: The slag cleaning device further comprises a connecting piece (13), and when the baffles (12) are in the enclosing state, two adjacent baffles (12) are detachably connected to the connecting piece (13).

4. The slag cleaning device according to claim 3, characterized in that: The connecting member (13) has two mutually perpendicular plug-in slots (131), the plug-in slots (131) are arranged in one-to-one correspondence with the baffles (12), the extension direction of the plug-in slots (131) is the same as the extension direction of the corresponding baffles (12), and the baffles (12) are inserted into the corresponding plug-in slots (131).

5. The slag cleaning device according to claim 2, characterized in that: In the vertical direction, the distance from the scraper (20) to the second end gradually increases from the bottom to the top of the collecting chamber (101).

6. The slag cleaning device according to claim 5, characterized in that: In the vertical direction, the distance from the side wall of the collecting chamber (101) close to the second end to the second end gradually decreases from the bottom to the top of the collecting chamber (101).

7. The slag cleaning device according to claim 2, characterized in that: The base (11) comprises a base plate (111) and a collection box (112), wherein the collection box (112) has the collection chamber (101), a plug hole (113) is provided at one end of the base plate (111), a plug plate (114) is provided on a side wall of the collection box (112), the plug plate (114) is plugged into and matched with the plug hole (113), a connection hole (115) is provided on the plug plate (114), a screw hole (116) is provided on the top of the base plate (111), when the plug plate (114) is plugged into the plug hole (113), the connection hole (115) and the screw hole (116) are arranged correspondingly, and fixing bolts are provided in the connection hole (115) and the screw hole (116) to fix the base plate (111) and the collection box (112).

8. The slag cleaning device according to claim 7, characterized in that: A blocking piece (117) is also provided in the screw hole (116) to block the screw hole (116); the blocking piece (117) does not protrude from the upper surface of the substrate (111).

9. The slag cleaning device according to claim 7, characterized in that: A guide block (118) is arranged on the top of the base plate (111), and two guide blocks (118) are arranged, and the two guide blocks (118) are symmetrically arranged along a center line extending in the width direction of the base plate (111), and the height of the guide block (118) gradually decreases in a direction away from the center line.

10. The slag cleaning device according to claim 7, characterized in that: The driving assembly (30) comprises: A hydraulic cylinder (31), wherein the hydraulic cylinder (31) is arranged on the base plate (111); A connecting rod (32), one end of the connecting rod (32) is connected to the hydraulic cylinder (31), and the other end of the connecting rod (32) is connected to the scraper (20), and the hydraulic cylinder (31) can drive the scraper (20) to move in the direction of the hydraulic cylinder (31) through the connecting rod (32), so as to drive the scraper (20) to switch from the avoidance position to the cleaning position.

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