A coke dry quenching conveyor belt cleaning mechanism

Abstract

The present application relates to material transportation technical field, specifically disclose a kind of coke dry quenching transport belt cleaning mechanism, including, cleaning roller, cleaning roller is installed in the roller cylinder near of belt discharge end, and cleaning roller is columnar structure, and cleaning roller surface is equipped with multiple cleaning surfaces;Mounting component, mounting component is installed in the both ends of cleaning roller, for cleaning roller is installed on dust cover;The both ends of cleaning roller are rotatably connected with mounting component, and locking piece is equipped on mounting component;The present application: through columnar cleaning roller, cooperate the setting of connecting part, multiple cleaning surfaces can be formed, relative to the existing single-face scraping plate, can be replaced by adjusting cleaning surface;Relative to the existing single-face cleaning structure wear and tear, by simple switching cleaning surface in cleaning roller instead of directly dismounting and replacing, its operation is simple, can be quickly adjusted in the process of equipment operation, effectively reduce the replacement cost of overhaul.

Description

Technical Field

[0001] This invention relates to the field of material transportation technology, specifically to a cleaning mechanism for a dry-quenched coke conveyor belt. Background Technology

[0002] Xianggang Coking Plant currently has three dry quenching coke ovens, among which the coke conveyor belts are the most important conveying device for transporting coke to the blast furnace for ironmaking. The service life of the belts is directly related to production costs, and the service life of the belts is also related to the surface cleaning. Therefore, cleaning structures are installed at the locations corresponding to the existing coke conveyor belts; generally, cleaning structures such as scrapers or cleaning brushes are fixedly installed near the belts. These structures remove surface materials by rotating the belt itself. However, after long-term use, the cleaning structures will wear down, resulting in reduced contact with the belt and affecting the cleaning effect. To ensure the cleaning effect of the belts, the entire structure must be replaced, increasing the operating cost of the cleaning device. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a cleaning mechanism for dry-quenched coke conveyor belts.

[0004] The dry quenching coke conveyor belt cleaning mechanism of the present invention includes: The cleaning roller is installed near the roller at the unloading end of the belt, and has a columnar structure with multiple cleaning surfaces on its surface. Mounting components are installed at both ends of the cleaning roller and are used to mount the cleaning roller onto the dust cover; The two ends of the cleaning roller are rotatably connected to the mounting components, and locking elements are provided on the mounting parts.

[0005] In some embodiments, the mounting component includes a mounting plate with a movable slot. The movable slot has a working area and a moving area that are interconnected. The working area is located at one end near the belt. The cleaning roller is inserted into the movable slot and can move and switch between the working area and the moving area. The cleaning roller is fixed and limited in the working area by a locking member.

[0006] In some embodiments, the portion of the cleaning roller located in the movable slot is configured as a connecting portion, and the connecting portion is polygonal. The cleaning roller forms a corresponding cleaning surface according to the polygon of the connecting portion. When the cleaning roller is in the working area of ​​the movable slot, the cleaning surface on the cleaning roller contacts the belt surface. The width of the active area is greater than the maximum width of the connecting part, and the connecting part can rotate within the active area.

[0007] In some embodiments, the belt end forms an arc-shaped reversing zone on the roller. The arc-shaped reversing zone is divided into an upper half and a lower half according to the axis of symmetry of the annular belt, and the movable slot is opened near the lower half.

[0008] In some embodiments, the vertical tangent on the outer side of the roller is designated as tangent A; The working area is located on the side near the bottom of the movable slot. The movable slot is set at an angle α with the vertical tangent A of the roller, and the working area is located below the movable area. The locking element is a limiting groove that corresponds to the shape of the connecting part of the cleaning roller. The limiting groove is located at the bottom of the working area, and the opening of the limiting groove faces the active area.

[0009] In some embodiments, the locking member further includes a reinforcing block, and the working area of ​​the limiting groove corresponding to the movable slot is opened on one side of the reinforcing block.

[0010] In some embodiments, a lateral positioning part is further included, which includes a positioning protrusion and a positioning groove. The positioning groove is formed on the side of the connecting part, and the positioning protrusion is fixedly installed on the inner wall of the limiting groove facing the positioning groove on the connecting part.

[0011] In some embodiments, the reinforcing block is slidably connected along the movable slot, and a positioning component for positioning the reinforcing block is fixedly connected to the mounting plate. The sliding of the reinforcing block on the working area can change the distance between the cleaning roller and the belt.

[0012] In some embodiments, the positioning component may be a positioning pin, a positioning hole, and an adjustment hole. The positioning hole is formed on the reinforcing block, and there are several adjustment holes. Several adjustment holes are formed along the working area on the mounting plate, and the positioning pin is positioned by being inserted into the positioning hole and the adjustment hole.

[0013] In some embodiments, both ends of the cleaning roller are provided with rotating handles after passing through the dust cover, and the rotating handles are polygonal in the same way as the connecting part. The dust cover has mounting holes with a diameter larger than that of the cleaning roller at both ends. The mounting plate covers the surface of the mounting holes and is detachably connected to the dust cover by bolts.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention: By using a columnar cleaning roller and a connecting part, multiple cleaning surfaces can be formed. Compared with the existing single-sided scraper, the cleaning surface can be adjusted instead of being replaced. Compared with the existing single-sided cleaning structure that needs to be disassembled and replaced after wear, the cleaning surface in the cleaning roller can be simply switched instead of being directly disassembled and replaced. Its operation is simple and can be quickly adjusted during equipment operation, effectively reducing the replacement cost of maintenance.

[0015] 2. This invention: The movable slot is located in the lower half of the area, and the movable slot is set at an angle α with the vertical tangent A of the roller, where the angle α is acute. The working area is located below the movable area. In the initial state, the cleaning roller is initially limited by the limiting slot in the working area by gravity. Then, the lateral positioning part positions the cleaning roller laterally to prevent lateral sliding of the cleaning roller and further limit the rotation of the cleaning roller. It has the following advantages: effectively avoids the impact of large pieces of coke, enhances the cleaning effect on large pieces of coke, and achieves positioning and installation of the cleaning roller through a simple structure while also allowing for convenient adjustment of the cleaning roller, thus more conveniently replacing the direct disassembly and replacement of the cleaning structure.

[0016] 3. This invention: By sliding the reinforcing block and the mounting plate, lengthening the working area, and setting the movable slot and the tangent B of the contact area at an angle b; when all the cleaning surfaces of the cleaning roller are initially worn, the distance between the cleaning roller and the belt can be effectively changed by sliding the connecting part in the working area, so as to reuse the cleaning roller. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the cross-sectional structure of Example 1; Figure 2 This is a front view structural diagram of Embodiment 1; Figure 3 This is a schematic diagram of the front section structure of Example 1; Figure 4 This is a schematic diagram of the structure of the cleaning roller in the active area when switching cleaning surfaces in Embodiment 1; Figure 5 This is a schematic diagram of the structure of the cleaning roller connection located in the working area in Embodiment 1; Figure 6 This is a schematic diagram of the reinforcing block in Example 1; Figure 7 This is a schematic diagram of the structure of Example 2; Figure 8 This is a schematic diagram of the structure in Embodiment 2 where the positioning pin limits the connection part.

[0018] In the diagram: 1. Cleaning roller; 101. Connecting part; 102. Cleaning surface; 2. Mounting components; 201. Mounting plate; 202. Movable slot; 2021. Working area; 2022. Moving area; 3. Locking component; 301. Limiting groove; 302. Reinforcing block; 303. Guide V-groove; 4. Dust cover; 5. Rotating handle; 6. Belt; 7. Roller; 8. Tangent A; 9. Included angle a; 10. Tangent B; 11. Included angle b; 12. Arc-shaped reversal zone; 1201. Upper half zone; 1202. Lower half zone; 13. Lateral positioning part; 1301. Positioning protrusion; 1302. Positioning groove; 14. Positioning component; 1401. Positioning pin; 1402. Positioning hole; 1403. Adjustment hole. Detailed Implementation

[0019] The following drawings will disclose several embodiments of the present invention. For clarity, many physical details will be described in the following description. However, it should be understood that these physical details are not intended to limit the invention. That is, in some embodiments of the invention, these physical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0020] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, such a combination should be considered nonexistent and not within the scope of protection claimed by this invention.

[0021] Example 1: Please see Figures 1-6 The dry quenching coke conveyor belt cleaning mechanism of the present invention includes: Cleaning roller 1 is installed near the roller 7 at the unloading end of belt 6, and the cleaning roller 1 has a columnar structure and multiple cleaning surfaces 102 are provided on the surface of the cleaning roller 1. Mounting component 2 is installed at both ends of the cleaning roller 1 and is used to mount the cleaning roller 1 onto the dust cover 4; The two ends of the cleaning roller 1 are rotatably connected to the mounting component 2, and a locking component 3 is provided on the mounting part. When the cleaning roller 1 is in the active area 2022 of the active slot 202, it can rotate inside, thereby realizing the rotatable connection with the mounting component 2.

[0022] Mounting component 2 includes mounting plate 201, on which a movable slot 202 is provided. The movable slot 202 has a working area 2021 and a movable area 2022 that are interconnected. The cleaning roller 1 is inserted into the movable slot 202 and can move and switch between the working area 2021 and the movable area 2022. The cleaning roller 1 is fixed and limited in the working area 2021 by locking component 3. When the cleaning roller 1 is in the working area 2021 in the movable slot 202, the cleaning surface 102 on the cleaning roller 1 contacts the surface of the belt 6. This contact refers to the actual required connection distance between the cleaning structure and the belt 6 in the prior art.

[0023] The portion of the cleaning roller 1 located in the movable slot 202 is configured as a connecting part 101, and the connecting part 101 is polygonal. The cleaning roller 1 forms a corresponding cleaning surface 102 according to the polygon of the connecting part 101. In this embodiment, the connecting part 101 is a regular hexagonal prism, the cleaning roller 1 is a regular polygonal prism with more than or equal to six facets, or the cleaning roller 1 is directly circular. The width of the active area 2022 is greater than the maximum width of the connecting part 101, and the connecting part 101 can rotate within the active area 2022; Please see Figure 2 For ease of description of orientation, the default setting is that belt 6 is rotated to a horizontal position. When belt 6 is set to a horizontal position; The end of the belt 6 forms an arc-shaped reversal zone 12 on the roller 7. The arc-shaped reversal zone 12 is divided into an upper half zone 1201 and a lower half zone 1202 according to the axis of symmetry of the annular belt 6, and the movable slot 202 is opened near the lower half zone 1202. The vertical tangent on the outer side of the roller 7 is designated as tangent A8; The working area 2021 is located on the side near the bottom in the movable slot 202. The movable slot 202 is set at an angle a9 with the vertical tangent A8 of the roller 7, and the angle a9 is an acute angle. The working area 2021 is located below the movable area 2022. The locking component 3 is a limiting groove 301 that corresponds to the shape of the connecting part 101 of the cleaning roller 1. The limiting groove 301 is located at the bottom of the working area 2021, and the opening of the limiting groove 301 faces the active area 2022. Alternatively, the locking component 3 may also include a reinforcing block 302, and the working area 2021 of the limiting groove 301 corresponding to the movable slot 202 is opened on one side of the reinforcing block 302; by setting the reinforcing block 302, more contact area with the connecting part 101 can be provided, making its positioning strength higher. In this embodiment, the limiting groove 301 is a groove that fits against two or three sides of the connecting part 101. When the limiting groove 301 is a groove that fits against two sides of the connecting part 101, the end of the limiting groove 301 near the active area 2022 of the active slot hole 202 opens outward to form a guide V groove 303. The end of the guide V groove 303 near the active area 2022 coincides with the inner wall of the active area 2022.

[0024] It also includes a lateral positioning part 13, which includes a positioning protrusion 1301 and a positioning groove 1302. The positioning groove 1302 is formed on the side of the connecting part 101 without a side. The positioning protrusion 1301 is fixedly installed on the inner wall of the limiting groove 301 facing the positioning groove 1302 on the connecting part 101. In this embodiment, the mating positioning protrusion 1301 located in the limiting groove 301 can be easily fitted into the positioning groove 1302 of the connecting part 101, thereby realizing the lateral positioning of the cleaning roller 1, avoiding the lateral sliding of the cleaning roller 1, and further restricting the rotation of the cleaning roller 1, reducing the slight movement of the cleaning roller 1 after being rubbed by the belt 6, avoiding the wear of the limiting groove 301 and the connecting part 101, and ensuring the positioning effect.

[0025] Working principle: When the movable slot 202 is located in the lower half of the zone 1202, the cleaning roller 1 will be installed below the roller 7 of the belt 6, which can prevent coke from clogging the surface of the belt 6; and when the coke moves from the belt 6 to the cleaning roller 1, large pieces of coke will crack or loosen downwards due to the deformation of the belt 6; at this time, the cleaning roller 1 installed in the lower half of the roller 7 1202 can effectively prevent large pieces of coke from impacting, and can also enhance the cleaning effect on large pieces of coke. When the cleaning roller 1 is assembled in the working area 2021 in the movable slot 202, because the movable slot 202 is set at an angle with the tangent A8, and the working area 2021 is located below the movable area 2022, the cleaning roller 1 will be located in the limiting groove 301 by gravity in the initial state, and thus be limited by the limiting groove 301 of the working area 2021. At this time, the belt 6 passes through the cleaning roller 1 under the rotation of the roller 7, and thus the coke on the surface of the belt 6 is peeled off by the cleaning roller 1. Because the device is installed near the roller 7 at the feeding end of the belt 6, the belt 6 always provides a downward force relative to the cleaning roller 1, so the cleaning roller 1 will be more stable in the limiting groove 301 during the operation of the belt 6. When the side of the cleaning roller 1 that contacts the belt 6 is worn, in order to avoid the need for complete replacement as in the prior art, the connecting part 101 on the cleaning roller 1 can be moved from the limiting groove 301 in the working area 2021 to the active area 2022. Since the width of the active area 2022 is greater than the maximum width of the connecting part 101, the connecting part 101 can rotate in the active area 2022. The rotation of the connecting part 101 can adjust the orientation of the cleaning roller 1 so that the unworn cleaning surface 102 faces the belt 6. Then the orientation adjustment connecting part 101 is installed into the working area 2021 and is limited by the limiting groove 301, so that the unworn area of ​​the cleaning roller 1 can contact the belt 6 and restore the cleaning effect on the belt 6. The columnar cleaning roller 1, in conjunction with the connecting part 101, can form multiple cleaning surfaces 102. Compared to the existing single-sided scraper, the cleaning surfaces 102 can be adjusted for replacement. The replacement of the cleaning surface 102 of the cleaning roller 1 only requires moving the cleaning roller 1 along the movable slot 202 and rotating it to achieve the switching. Compared to the existing single-sided cleaning structure, such as the scraper being disassembled and replaced after wear, the cleaning surface 102 in the cleaning roller 1 can be simply switched instead of being directly disassembled and replaced. The operation is simple and can be quickly adjusted during equipment operation, effectively reducing the replacement cost of maintenance.

[0026] Example 2: Please see Figure 3 , Figure 7 and Figure 8 As a further improvement to Embodiment 1, after all the cleaning surfaces 102 of the cleaning roller 1 have been initially worn, in order to reuse the cleaning roller 1, the cleaning roller 1 can be moved closer to the belt 6 in the working area 2021 by the reinforcing block 302. Therefore, the length of the working area 2021 can be increased, and the reinforcing block 302 can be slidably positioned along it. However, since the diameter of the cleaning roller 1 becomes smaller after wear, it is necessary for the reinforcing block 302 to slide on the working area 2021 to change the distance between the cleaning roller 1 and the belt 6. Specifically, the reinforcing block 302 is slidably connected along the movable slot 202, and a positioning component 14 for positioning the reinforcing block 302 is fixedly connected on the mounting plate 201. The reinforcing block 302 can change the distance between the cleaning roller 1 and the belt 6 by sliding on the working area 2021. Furthermore, when the connecting part 101 of the cleaning roller 1 is located in the working area 2021, the cleaning surface 102 of the cleaning roller 1 forms a contact area with the belt 6 on the roller 7, and the movable slot 202 contacts the tangent B10 of the contact area at an angle b11, and the angle b11 is set as an acute angle. Working principle: After all the cleaning surfaces 102 of the cleaning roller 1 have been initially worn, the fixing of the reinforcing block 302 to the mounting plate 201 is released by the positioning component 14, which allows the cleaning roller 1 to move in the extended part of the working area 2021. Because the movable slot 202 is set at an angle b11 to the tangent B10 of the contact area, and the connecting part 101 in the cleaning roller 1 slides in the working area 2021, the distance between the cleaning roller 1 and the belt 6 can be effectively changed, and the cleaning roller 1 can be reused. At the same time, it can also have the beneficial effects provided in Embodiment 1. The positioning component 14 may be a positioning pin 1401, a positioning hole 1402, and an adjustment hole 1403. The positioning hole 1402 is opened on the reinforcing block 302, and there are several adjustment holes 1403. Several adjustment holes 1403 are opened on the mounting plate 201 along the working area 2021. The positioning pin 1401 is positioned by being inserted into the positioning hole 1402 and the adjustment hole 1403. Please see Figure 8 Of course, there can be two positioning holes 1402. The two positioning holes 1402 are opened on both sides of the limiting groove 301, and the distance between the positioning hole 1402 and the bottom opening of the limiting groove 301 is greater than or equal to the maximum diameter of the connecting part 101. The adjusting hole 1403 is set on both sides of the working area 2021 corresponding to the positioning hole 1402. The positioning pin 1401 is a U-shaped pin, which can be used to limit the connecting part 101 of the cleaning roller 1 in the limiting groove 301. Because existing cleaning structures generally use relatively hard scrapers or brush-like structures with sufficient flexibility depending on different working conditions, if a hard structure is required, the cleaning roller 1 in this device can be a cylindrical structure, and then cleaning ribs that contact the belt 6 are added to the surface to form a cleaning surface 102 that contacts the belt 6. When a brush-like structure is used, it is directly shaped into a hexagonal prism or cylinder. When the cleaning roller 1 is brush-shaped, its wear does not actually break the bristles, but only causes the bristles to shrink and curl. If the shrinking and curling bristles make good enough contact to a certain extent, they will not affect the cleaning effect on the belt 6. However, after the bristles shrink and curl after long-term use, they will affect the contact distance with the belt 6. Therefore, through this embodiment, the columnar brush-type cleaning roller 1 can be better utilized.

[0027] In Examples 1 and 2: After passing through the dust cover 4 at both ends of the cleaning roller 1, a rotating handle 5 is provided. The rotating handle 5 is a polygonal shape with the same shape as the connecting part 101, and a mark can be set on the rotating handle 5. Then, the contact surface between the cleaning roller 1 and the belt 6 in the dust cover 4 is determined by the mark facing the belt 6. Thus, the cleaning surface 102 can be quickly replaced directly from outside the dust cover 4 to restore the cleaning effect of the belt 6. The dust cover 4 has mounting holes with a diameter larger than that of the cleaning roller 1 at both ends. The mounting plate 201 covers the surface of the mounting holes and is detachably connected to the dust cover 4 by bolts. The cleaning roller 1 can be replaced as a whole through the mounting holes.

[0028] The above are merely embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A dry quenching coke conveyor belt cleaning mechanism, characterized by, include: Cleaning roller (1) is installed near the roller (7) at the unloading end of the belt (6), and the cleaning roller (1) has a columnar structure and multiple cleaning surfaces (102) are provided on the surface of the cleaning roller (1). Mounting component (2), which is mounted on both ends of cleaning roller (1), is used to mount cleaning roller (1) on dust cover (4); The cleaning roller (1) is rotatably connected to the mounting component (2) at both ends, and a locking component (3) is provided on the mounting component.

2. A dry quenching coke conveyor belt cleaning mechanism according to claim 1, characterized in that: The mounting component (2) includes a mounting plate (201), on which a movable slot (202) is provided. The movable slot (202) has a working area (2021) and a movable area (2022) that are connected to each other. The working area (2021) is located at one end near the belt (6). The cleaning roller (1) is inserted into the movable slot (202) and can move and switch between the working area (2021) and the movable area (2022). The cleaning roller (1) is fixed and limited in the working area (2021) by a locking member (3).

3. A dry quenching coke conveyor belt cleaning mechanism according to claim 2, characterized in that: The cleaning roller (1) located in the movable slot (202) is configured as a connecting part (101), and the connecting part (101) is polygonal. The cleaning roller (1) has a corresponding cleaning surface (102) formed according to the polygon of the connecting part (101). When the cleaning roller (1) is in the working area (2021) in the movable slot (202), the cleaning surface (102) on the cleaning roller (1) is in contact with the surface of the belt (6); The width of the active area (2022) is greater than the maximum width of the connecting part (101), and the connecting part (101) can rotate within the active area (2022).

4. The dry quenching coke conveyor belt cleaning mechanism according to claim 3, characterized in that: The end of the belt (6) forms an arc-shaped reversing zone (12) on the roller (7). The arc-shaped reversing zone (12) is divided into an upper half (1201) and a lower half (1202) according to the axis of symmetry of the annular belt (6), and the movable slot (202) is opened near the lower half (1202).

5. A cleaning mechanism for a dry-quenched coke conveyor belt according to claim 4, characterized in that: The vertical tangent on the outer side of the roller (7) is designated as tangent A (8); The working area (2021) is located on the side near the bottom of the movable slot (202). The movable slot (202) is set at an angle α (9) with the vertical tangent A (8) of the roller (7), and the working area (2021) is located below the movable area (2022). The locking member (3) is a limiting groove (301) corresponding to the shape of the connecting part (101) of the cleaning roller (1). The limiting groove (301) is located at the bottom of the working area (2021), and the opening of the limiting groove (301) faces the active area (2022).

6. A cleaning mechanism for a dry-quenched coke conveyor belt according to claim 5, characterized in that: The locking component (3) also includes a reinforcing block (302), and the working area (2021) of the limiting groove (301) corresponding to the movable slot (202) is opened on one side of the reinforcing block (302).

7. A cleaning mechanism for a dry-quenched coke conveyor belt according to claim 6, characterized in that: It also includes a lateral positioning part (13), which includes a positioning protrusion (1301) and a positioning groove (1302). The positioning groove (1302) is opened on the side of the connecting part (101) without side, and the positioning protrusion (1301) is fixedly installed on the inner wall of the limiting groove (301) facing the positioning groove (1302) on the connecting part (101).

8. A cleaning mechanism for a dry-quenched coke conveyor belt according to claim 6, characterized in that: The reinforcing block (302) is slidably connected along the movable slot (202), and a positioning component (14) for positioning the reinforcing block (302) is fixedly connected on the mounting plate (201). The reinforcing block (302) can change the distance between the cleaning roller (1) and the belt (6) by sliding on the working area (2021).

9. A cleaning mechanism for a dry-quenched coke conveyor belt according to claim 8, characterized in that: The positioning component (14) may be a positioning pin (1401), a positioning hole (1402), and an adjustment hole (1403). The positioning hole (1402) is opened on the reinforcing block (302), and the number of adjustment holes (1403) is several. Several adjustment holes (1403) are opened on the mounting plate (201) along the working area (2021). The positioning pin (1401) is positioned by being inserted into the positioning hole (1402) and the adjustment hole (1403).

10. A dry quenching coke conveyor belt cleaning mechanism according to claim 2, characterized in that: The cleaning roller (1) has a rotating handle (5) at both ends after passing through the dust cover (4). The rotating handle (5) is a polygonal shape, the same as the connecting part (101). The dust cover (4) has mounting holes with a diameter larger than that of the cleaning roller (1) at both ends. The mounting plate (201) covers the surface of the mounting holes and is detachably connected to the dust cover (4) by bolts.

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