A carbon black production discharging machine

Abstract

The utility model discloses a carbon black production unloading machine, including the unloading pipe, the unloading pipe is connected with the filtering mechanism, and the filtering mechanism below is connected with the distributing mechanism, the filtering mechanism includes the filter bowl, be provided with the filter screen in the filter bowl, the middle part rotation of filter screen is provided with the drive shaft, the drive shaft is connected with the drive motor, at least one mounting rod is provided on the drive shaft, the brush is provided on the mounting rod, the brush is in contact with the filter screen, the free end of mounting rod is along its end face and is opened to have the sliding cavity, the sliding cavity is slidably provided with the slide rod, one end of slide rod is located in the sliding cavity and is connected with the compression spring, the other end of slide rod is located outside the sliding cavity and is connected with the knock board, the position corresponding knock board is provided with a plurality of first knock ball on the inner wall of filter bowl at interval, the carbon black production unloading machine has the advantage that can handle the carbon black of filter screen and remains.

Description

Technical Field

[0001] This utility model relates to the field of carbon black production technology, and in particular to a carbon black production feeding machine. Background Technology

[0002] Carbon black is a black powdery substance produced by the incomplete combustion or pyrolysis of hydrocarbons in the gas phase under strictly controlled process conditions. Its main component is elemental carbon, with small amounts of oxygen, hydrogen, and sulfur. Carbon black materials need to be packaged in bags before use.

[0003] Chinese utility model patent CN219024956U discloses a carbon black processing device with segmented feeding after sieving. A first motor drives a brush plate to rotate, causing the brush to sweep the carbon black on the screen. This movement allows the carbon black to fall more effectively through the screen openings into a connecting cylinder and then into the groove of the feeding roller. This sweeping method increases the movement of the carbon black, ensuring the entire screen is swept and improving screening efficiency. Furthermore, when a certain amount of carbon black is loaded into the groove of the feeding roller, the roller rotates, emptying the material into the next process. Each groove can hold a fixed weight of carbon black, which not only controls the weight of the carbon black being fed but also effectively prevents large amounts of carbon black from agglomerating again after sieving, resulting in better performance.

[0004] However, this utility model patent does not provide a method for dealing with the carbon black left on the screen. If the carbon black remains for a long time, it will clog the screen and affect the feeding.

[0005] Therefore, how to handle the carbon black material left on the screen is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a carbon black production feeding machine that removes the carbon black material left on the screen.

[0007] To achieve the above objectives, this utility model provides a carbon black production feeding machine, including a feeding pipe, a filtering mechanism connected to the feeding pipe, and a material distribution mechanism connected below the filtering mechanism;

[0008] The filtration mechanism includes a filter cylinder containing a filter screen. A drive shaft is rotatably mounted on the center of the filter screen and connected to a drive motor. At least one mounting rod is mounted on the drive shaft, and a brush is mounted on the mounting rod. The brush abuts against the filter screen. A sliding cavity is formed along the end face of the free end of the mounting rod. A sliding rod is slidably mounted inside the sliding cavity. One end of the sliding rod is located inside the sliding cavity and connected to a compression spring, while the other end of the sliding rod is located outside the sliding cavity and connected to a striking plate. A plurality of first striking balls are evenly spaced on the inner wall of the filter cylinder corresponding to the positions of the striking plates.

[0009] The working process and principle of the above structure are as follows:

[0010] Carbon black material is conveyed from the feed pipe to the filter mechanism and falls onto the filter screen. The drive motor drives the drive shaft to rotate, and the mounting rod drives the brush to rotate along the drive shaft, allowing the brush to sweep the carbon black on the filter screen. The carbon black moves and falls more effectively through the holes of the filter screen into the distribution mechanism. The carbon black remaining on the filter screen is gradually swept to the edge of the filter screen by the rotation of the brush. After accumulating to a certain height, it reaches the position of the first striking ball and the striking plate. The striking plate rotates with the mounting rod and contacts the inner wall of the filter cylinder. When it passes the position of the first striking ball, the striking plate will contract under force. When it passes the position of the first striking ball, the striking plate will extend outward under the action of the compression spring, thus realizing the repeated extension and retraction striking process. Under the combined striking action of the striking plate and the first striking ball, the carbon black particles are knocked into powder and fall from the filter screen, thereby realizing the treatment of retained carbon black and preventing the filter screen from clogging.

[0011] Furthermore, the material distribution mechanism includes a material distribution plate with at least two feeding ports distributed circumferentially on the material distribution plate. The drive shaft passes through the material distribution plate and is rotatably connected to the material distribution plate. At least one scraper is provided on the drive shaft. The lower edge of the scraper abuts against the top surface of the material distribution plate and the lower edge of the scraper abuts against the inner wall of the material distribution plate. The drive motor is located at the lower center of the material distribution plate.

[0012] The filtered carbon black falls onto the distribution plate, and the scraper rotates with the drive shaft, gradually pushing the carbon black into the two feeding ports, discharging it evenly and avoiding uneven feeding to ensure the stability of the feeding process.

[0013] Furthermore, there are two mounting rods, which are symmetrically distributed on the side wall of the drive shaft about the axis of the drive shaft.

[0014] The two mounting rods improve the cleaning efficiency of the brushes and also enhance the striking efficiency of the striking plate.

[0015] Furthermore, the three first striking balls are arranged in a row, and eight rows are evenly distributed around the inner wall of the filter cylinder.

[0016] The eight rows of first striking balls increase the striking frequency, and the three first striking balls in one row ensure the stability of the striking board under force and extend its service life.

[0017] Furthermore, the striking plate is provided with three second striking balls corresponding to the position of the first striking ball in each column.

[0018] By coordinating and matching the first and second striking balls, the local force concentration is improved, the striking effect is enhanced, and a stronger striking effect is achieved. Of course, this also results in a smaller striking area, but since the striking plate is constantly rotating, it will not affect the overall striking result of the retained carbon black.

[0019] Furthermore, the filter cylinder has the same outer diameter as the distribution plate, and a connector strip is provided at the lower edge of the filter cylinder. A connector hole is provided at the edge of the distribution plate corresponding to the position of the connector strip, and the connector hole is inserted into the connector strip.

[0020] The filter cartridge and the distribution plate are connected together by a connector strip and a connector hole. They can be separated during maintenance, or the connection between the two can be maintained. The filter cartridge limits the carbon black on the distribution plate to prevent it from exceeding the distribution plate.

[0021] Furthermore, the feeding pipe includes an input pipe and a feeding cover, the input pipe is connected to a transmission mechanism, and a gauze pipe is connected between the input pipe and the feeding cover.

[0022] The gauze tube is mainly designed to allow air to pass through and stabilize the pressure, preventing excessive pressure inside the feeding tube from causing powder to burst.

[0023] Furthermore, the feeding port is connected to a packaging tube, and an electrically controlled valve is installed at the outlet end of the packaging tube.

[0024] By setting up the packaging tube and the electric control valve, the feeding amount can be controlled and adjusted. Under the action of the electric control valve, the packaging tube can be opened only after the carbon black powder has filled the entire tube, or it can be opened at a certain frequency.

[0025] Furthermore, the filter screen is a rigid filter screen, and a rotating sleeve is provided in the middle of the filter screen, and the drive shaft is rotatably connected to the rotating sleeve.

[0026] The rotating sleeve is designed to facilitate the rotational connection between the filter screen and the drive shaft.

[0027] Furthermore, the drive shaft has several slots on its side wall, the mounting rod is connected to a first fixing sleeve, the inner wall of the first fixing sleeve has a first protrusion corresponding to the slot, and the first fixing sleeve is fitted onto the drive shaft; the scraper is connected to a second fixing sleeve, the inner wall of the second fixing sleeve has a second protrusion corresponding to the slot, and the first fixing sleeve is fitted onto the drive shaft.

[0028] The first fixing sleeve and the first protrusion facilitate the drive shaft to engage with the first protrusion through the slot, thereby driving the mounting rod to rotate. The second fixing sleeve and the second protrusion facilitate the drive shaft to engage with the second protrusion through the slot, thereby driving the scraper to rotate.

[0029] The carbon black production feeding machine of this invention transmits carbon black material from the feeding pipe to the filter mechanism, where it falls onto the filter screen. A drive motor rotates the drive shaft, and a mounting rod drives a brush to rotate along the drive shaft. This allows the brush to sweep the carbon black on the filter screen, causing it to move and fall more effectively through the holes in the filter screen into the distribution mechanism. The carbon black remaining on the filter screen is gradually swept to the edge of the screen by the rotating brush, accumulating to a certain height until it reaches the position of the first striking ball and striking plate. The striking plate rotates with the mounting rod and contacts the inner wall of the filter cylinder. When it passes the position of the first striking ball, the striking plate contracts under pressure. After passing the position of the first striking ball, the striking plate extends outward under the action of a compression spring, thus achieving a repeated extending and retracting striking process. Under the combined striking action of the striking plate and the first striking ball, the carbon black particles are broken into powder and fall from the filter screen, thus treating the retained carbon black and preventing filter screen blockage.

[0030] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0032] Figure 1 This is a front view of the overall structure of a carbon black production feeding machine provided in an embodiment of the present utility model;

[0033] Figure 2 A top view of a filtration mechanism in a carbon black production feeder provided in an embodiment of this utility model;

[0034] Figure 3 A top view of a material distribution mechanism in a carbon black production feeder provided in an embodiment of this utility model;

[0035] Figure 4 This is a front sectional view of the filtration mechanism in a carbon black production feeder provided in an embodiment of the present utility model.

[0036] The components are as follows: 1. Feeding pipe; 101. Input pipe; 102. Feeding cover; 103. Gauze pipe; 2. Filtering mechanism; 201. Filter cylinder; 202. Filter screen; 203. Mounting rod; 204. Brush; 205. Sliding cavity; 206. Slide rod; 207. Compression spring; 208. Striking plate; 209. First striking ball; 210. Second striking ball; 211. Insert strip; 212. Rotating sleeve; 213. First fixed sleeve; 214. First protrusion; 3. Distributing mechanism; 301. Distributing plate; 302. Feeding port; 303. Scraper; 304. Insert hole; 305. Packaging pipe; 306. Electric control valve; 307. Second fixed sleeve; 308. Second protrusion; 4. Drive shaft; 401. Slot; 5. Drive motor. Detailed Implementation

[0037] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0038] The core of this utility model is to provide a carbon black production feeding machine to improve the effective load capacity of the carbon black production feeding machine.

[0039] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0040] Please refer to Figures 1 to 4 The present invention discloses a carbon black production feeding machine, including a feeding pipe 1, a filter mechanism 2 connected to the feeding pipe 1, and a material distribution mechanism 3 connected below the filter mechanism 2.

[0041] The filtration mechanism 2 includes a filter cylinder 201, which is a cylindrical structure with both ends open. A filter screen 202 is installed inside the filter cylinder 201. A drive shaft 4 is rotatably mounted in the middle of the filter screen 202. The drive shaft 4 is connected to a drive motor 5. A mounting rod 203 is mounted on the drive shaft 4. A brush 204 is mounted on the mounting rod 203 and abuts against the filter screen 202. A sliding cavity 205 is formed along the end face of the free end of the mounting rod 203. A sliding rod is slidably mounted in the sliding cavity 205. 206. A sliding block is provided at the tail end of the sliding rod 206. The sliding block is slidably engaged with the sliding cavity 205. One end of the sliding rod 206 is located inside the sliding cavity 205 and is connected to a compression spring 207 through the sliding block. The other end of the sliding rod 206 is located outside the sliding cavity 205 and is connected to a striking plate 208. The outer surface of the striking plate 208 is an arc-shaped surface, which facilitates a tight fit with the inner wall of the filter cylinder 201. Several first striking balls 209 are evenly spaced on the inner wall of the filter cylinder 201 corresponding to the position of the striking plate 208.

[0042] The working process and principle of the above structure are as follows:

[0043] Carbon black material is conveyed from the feed pipe 1 to the filter mechanism 2 and falls onto the filter screen 202. The drive motor 5 drives the drive shaft 4 to rotate, and the mounting rod 203 drives the brush 204 to rotate along the drive shaft 4, so that the brush 204 can sweep the carbon black on the filter screen 202. The carbon black moves and falls more effectively from the holes of the filter screen 202 into the distribution mechanism 3. The carbon black remaining on the filter screen 202 will be gradually swept to the edge of the filter screen 202 by the rotation of the brush 204. After accumulating to a certain height, it reaches the first striking ball 209 and the striking plate. At position 208, the striking plate 208 rotates with the mounting rod 203 and contacts the inner wall of the filter cylinder 201. When it passes the position of the first striking ball 209, the striking plate 208 will contract under force. After passing the position of the first striking ball 209, the striking plate 208 will extend outward under the action of the compression spring 207, thereby realizing the repeated extension and retraction striking process. Under the striking action of the striking plate 208 and the first striking ball 209, the carbon black particles are knocked into powder and fall from the filter screen 202, thereby realizing the treatment of carbon black retention and preventing the filter screen 202 from clogging.

[0044] In another embodiment of this utility model, such as Figure 1 and Figure 3 As shown, the material distribution mechanism 3 includes a material distribution plate 301 with two feeding ports 302 distributed around its circumference. A drive shaft 4 passes through the material distribution plate 301 and is rotatably connected to it. Two scrapers 303 are provided on the drive shaft 4. The lower edge of the scrapers 303 abuts against the top surface of the material distribution plate 301 and the lower edge of the scrapers 303 abuts against the inner wall of the material distribution plate 301. The drive motor 5 is located at the lower center of the material distribution plate 301.

[0045] The filtered carbon black falls onto the distribution plate 301. The scraper 303 rotates with the drive shaft 4, gradually pushing the carbon black into the two discharge ports 302, discharging it evenly and avoiding uneven feeding to ensure the stability of the feeding process.

[0046] In another embodiment of this utility model, such as Figure 1 and Figure 2 as well as Figure 4 As shown, there are two mounting rods 203, which are symmetrically distributed on the side wall of the drive shaft 4 about the axis of the drive shaft 4.

[0047] The installation of two mounting rods 203 improves the cleaning efficiency of the brush 204 and also improves the striking efficiency of the striking plate 208.

[0048] In another embodiment of this utility model, such as Figure 2 and Figure 4 As shown, the three first striking balls 209 are arranged in a row, and eight rows are evenly distributed around the inner wall of the filter cylinder 201.

[0049] The arrangement of eight rows of first striking balls 209 increases the striking frequency. The three first striking balls 209 are arranged in a row to ensure the stability of the striking plate 208 under force and extend its service life.

[0050] In another embodiment of this utility model, three second striking balls 210 are provided on the striking plate 208 corresponding to the positions of each column of first striking balls 209. Both the first striking balls 209 and the second striking balls 210 are hemispherical structures.

[0051] By coordinating and cooperating with the first striking ball 209 and the second striking ball 210, the local force concentration is improved, the striking effect is enhanced, and a stronger striking effect is achieved. Of course, this also results in a smaller striking area, but the striking plate 208 rotates continuously and will not affect the overall striking result of the retained carbon black.

[0052] In another embodiment of this utility model, such as Figure 1 and Figure 3 As shown, the filter cylinder 201 and the distribution plate 301 have the same outer diameter. A connector strip 211 is provided at the lower edge of the filter cylinder 201. A connector hole 304 is provided at the edge of the distribution plate 301 corresponding to the position of the connector strip 211. The connector hole 304 is inserted into the connector strip 211.

[0053] The filter cartridge 201 and the distribution plate 301 are connected together by the plug strip 211 and the plug hole 304. They can be separated during maintenance, and the connection between the two can be maintained. The filter cartridge 201 plays a limiting role for the carbon black on the distribution plate 301, preventing it from exceeding the distribution plate 301.

[0054] In another embodiment of this utility model, such as Figure 1 As shown, the feeding pipe 1 includes an input pipe 101 and a feeding cover 102. The input pipe 101 is connected to a transmission mechanism, and a gauze pipe 103 is connected between the input pipe 101 and the feeding cover 102. The structure of the feeding cover 102 is mainly to facilitate matching the diameter of the filter cylinder 201.

[0055] The gauze tube 103 is mainly designed to provide ventilation and stabilize pressure, preventing excessive pressure inside the feed tube 1 from causing powder explosion.

[0056] In another embodiment of this utility model, such as Figure 1 As shown, the discharge port 302 is connected to a packaging tube 305, and an electric control valve 306 is installed at the outlet end of the packaging tube 305.

[0057] By setting up the packaging tube 305 and the electric control valve 306, the feeding amount can be controlled and adjusted. Under the action of the electric control valve 306, the tube can be opened after the carbon black powder fills the entire packaging tube 305, or it can be opened at a frequency.

[0058] In another embodiment of this utility model, such as Figure 1 and Figure 4 As shown, the filter screen 202 is a rigid filter screen 202, and a rotating sleeve 212 is provided in the middle of the filter screen 202. The drive shaft 4 is rotatably connected to the rotating sleeve 212.

[0059] The rotating sleeve 212 is designed to facilitate the rotational connection between the filter screen 202 and the drive shaft 4 via the rotating sleeve 212.

[0060] In another embodiment of this utility model, such as Figure 2 and Figure 3 As shown, the drive shaft 4 has several slots 401 on its side wall. The mounting rod 203 is connected to a first fixing sleeve 213. The inner wall of the first fixing sleeve 213 is provided with a first protrusion 214 corresponding to the slot 401. The first fixing sleeve 213 is fitted onto the drive shaft 4. The scraper 303 is connected to a second fixing sleeve 307. The inner wall of the second fixing sleeve 307 is provided with a second protrusion 308 corresponding to the slot 401. The first fixing sleeve 213 is fitted onto the drive shaft 4.

[0061] The first fixing sleeve 213 and the first protrusion 214 facilitate the drive shaft 4 to cooperate with the first protrusion 214 through the slot 401, thereby driving the mounting rod 203 to rotate. The second fixing sleeve 307 and the second protrusion 308 facilitate the drive shaft 4 to cooperate with the second protrusion 308 through the slot 401, thereby driving the scraper 303 to rotate.

[0062] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0063] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0064] It should be noted that when an element is said to be "fixed" to another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly" on another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0065] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0066] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0067] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0068] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A carbon black production feeding machine, characterized in that, It includes a feeding pipe (1), the feeding pipe (1) is connected to a filter mechanism (2), and a material distribution mechanism (3) is connected below the filter mechanism (2); The filtration mechanism (2) includes a filter cylinder (201), a filter screen (202) is disposed inside the filter cylinder (201), a drive shaft (4) is rotatably disposed in the middle of the filter screen (202), the drive shaft (4) is connected to a drive motor (5), at least one mounting rod (203) is disposed on the drive shaft (4), a brush (204) is disposed on the mounting rod (203), the brush (204) abuts against the filter screen (202), and the mounting rod (203) The free end of the filter cylinder (201) has a sliding cavity (205) along its end face. A slide rod (206) is slidably arranged in the sliding cavity (205). One end of the slide rod (206) is located in the sliding cavity (205) and connected to a compression spring (207). The other end of the slide rod (206) is located outside the sliding cavity (205) and connected to a striking plate (208). A plurality of first striking balls (209) are arranged at equal intervals on the inner wall of the filter cylinder (201) corresponding to the position of the striking plate (208).

2. The carbon black production feeding machine as described in claim 1, characterized in that, The material distribution mechanism (3) includes a material distribution plate (301), on which at least two feeding ports (302) are distributed circumferentially. The drive shaft (4) passes through the material distribution plate (301) and is rotatably connected to it. At least one scraper (303) is provided on the drive shaft (4). The lower edge of the scraper (303) abuts against the top surface of the material distribution plate (301) and the lower edge of the scraper (303) abuts against the inner wall of the material distribution plate (301). The drive motor (5) is located at the lower center of the material distribution plate (301).

3. The carbon black production feeding machine as described in claim 1, characterized in that, Two mounting rods (203) are provided, and the two mounting rods (203) are symmetrically distributed on the side wall of the drive shaft (4) about the axis of the drive shaft (4).

4. The carbon black production feeding machine as described in claim 1, characterized in that, The three first striking balls (209) are arranged in a row, and eight rows are evenly distributed around the inner wall of the filter cylinder (201).

5. The carbon black production feeding machine as described in claim 4, characterized in that, The striking plate (208) is provided with three second striking balls (210) corresponding to the position of the first striking ball (209) in each column.

6. The carbon black production feeding machine as described in claim 2, characterized in that, The filter cylinder (201) has the same outer diameter as the distribution plate (301). A plug strip (211) is provided at the lower edge of the filter cylinder (201). A plug hole (304) is provided on the edge of the distribution plate (301) corresponding to the position of the plug strip (211). The plug hole (304) is plugged into the plug strip (211).

7. The carbon black production feeding machine as described in claim 1, characterized in that, The feeding pipe (1) includes an input pipe (101) and a feeding cover (102). The input pipe (101) is connected to a transmission mechanism, and a gauze pipe (103) is connected between the input pipe (101) and the feeding cover (102).

8. The carbon black production feeding machine as described in claim 2, characterized in that, The discharge port (302) is connected to a packaging tube (305), and an electric control valve (306) is provided at the outlet end of the packaging tube (305).

9. The carbon black production feeding machine as described in claim 1, characterized in that, The filter screen (202) is a rigid filter screen (202), and a rotating sleeve (212) is provided in the middle of the filter screen (202). The drive shaft (4) is rotatably connected to the rotating sleeve (212).

10. The carbon black production feeding machine as described in claim 2, characterized in that, The drive shaft (4) has several slots (401) on its side wall. The mounting rod (203) is connected to a first fixing sleeve (213). The inner wall of the first fixing sleeve (213) is provided with a first protrusion (214) corresponding to the slot (401). The first fixing sleeve (213) is fitted onto the drive shaft (4). The scraper (303) is connected to a second fixing sleeve (307). The inner wall of the second fixing sleeve (307) is provided with a second protrusion (308) corresponding to the slot (401). The first fixing sleeve (213) is fitted onto the drive shaft (4).

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