Tail powder recovery device for quartz sand production

Abstract

The utility model discloses a quartz sand production tail powder recovery device, which belongs to the technical field of quartz sand production and comprises a tail powder recovery tank, a filter separation screen is fixedly mounted on the upper portion of an inner cavity of the tail powder recovery tank, and a separation blanking slope slide end is arranged at one end of the top surface of the filter separation screen. A discharging lifting arc-shaped plate is arranged at the end, close to the separating discharging slope sliding end, of the filtering and separating screen, an output shaft of the servo motor longitudinally and rotationally penetrates through the top end of the filtering and separating screen, anti-blocking scraping rods are symmetrically welded to the output shaft, and an electric lifting rod is longitudinally installed on the inner wall of the U-shaped supporting frame rod. The top end of the electric lifting rod is connected with the bottom face of the discharging lifting arc-shaped plate, and a separation flow channel is formed in an inner cavity of the tail powder recycling tank. According to the utility model, only particle quartz sand meeting the actual required particle size requirement on site can fall to the bottom of the tail powder recovery tank through the screen, so that a rapid and effective screening and separating process is realized.

Description

Technical Field

[0001] This utility model belongs to the field of quartz sand production technology, and in particular to a device for recovering tailings powder from quartz sand production. Background Technology

[0002] Quartz sand is quartz particles produced by crushing and processing quartz stone. Quartz stone is a non-metallic mineral, and quartz sand is an important industrial mineral raw material. It is a non-hazardous chemical and is widely used in glass, casting, ceramics and fireproofing materials, ferrosilicon smelting, metallurgical flux, metallurgy, construction, chemicals, plastics, rubber, abrasives, filter media, and other industries. A quartz sand production tailings recovery device is a specially designed device for collecting and recovering tailings from the quartz sand processing process. Currently, with the increasing demands for raw material purity in industrial development and increasingly stringent environmental regulations, how to effectively handle the large amount of tailings generated during quartz sand production has become an urgent problem to be solved.

[0003] In the traditional quartz sand production process, the screening of tailings powder usually relies on simple mechanical screening or manual screening. These methods lack precision and specificity, making it difficult to effectively screen and separate according to the actual particle size requirements on site. Utility Model Content

[0004] The purpose of this invention is to provide a device for recovering tailings powder from quartz sand production, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a quartz sand production tailings recovery device, including a tailings recovery tank. The top of the tailings recovery tank has a tailings input component for inputting tailings during quartz sand production. A filter screen is fixedly installed in the upper part of the inner cavity of the tailings recovery tank. A separation and discharge ramp is provided at one end of the top surface of the filter screen, so that the top surface of the filter screen has a downward inclined tendency. A discharge lifting arc plate is provided at one end of the filter screen near the separation and discharge ramp. When the discharge lifting arc plate and the filter screen are spliced ​​together, they form a structure that is circular in shape when viewed from above.

[0006] A U-shaped support rod is fixed below the filter screen and between the inner wall of the tail powder recovery tank. A servo motor is installed in the middle of the inner wall of the U-shaped support rod. The output shaft of the servo motor rotates longitudinally through to the top of the filter screen, and anti-clogging scrapers are symmetrically welded to the output shaft. An electric lifting rod is installed longitudinally on one side of the servo motor and between the inner wall of the U-shaped support rod. The top of the electric lifting rod is connected to the bottom surface of the discharge lifting arc plate. Below the discharge lifting arc plate and inside the tail powder recovery tank, there is a separation channel for discharging the quartz sand that has not been filtered and separated by the filter screen.

[0007] In this preferred embodiment, the separation channel includes an arc-shaped enclosure plate fixed to the bottom surface of the filter separation screen near the bottom of the separation discharge slope, and a discharge slope integrally connected to the bottom of the arc-shaped enclosure plate.

[0008] In this preferred embodiment, the inner edge of the arc-shaped enclosure plate is sealed and connected to the inner wall of the tailings recovery tank to form a separation channel for the discharge of separated quartz sand tailings.

[0009] In a preferred embodiment, the tail powder recovery tank has a discharge port on its outer periphery facing the discharge ramp, and a detachable maintenance side plate is installed on the discharge port by screws.

[0010] In a preferred embodiment, the outer wall of the detachable maintenance side plate is connected to an upper discharge pipe, one end of which passes through the detachable maintenance side plate and extends to the discharge slope of the separation channel.

[0011] In a preferred embodiment of this solution, an auxiliary cleaning component is provided above the filter separation screen. The auxiliary cleaning component can be driven to rotate by a servo motor on the top surface of the filter separation screen, so that the auxiliary cleaning component can clean the attached tail powder in the space above the filter separation screen.

[0012] In a preferred embodiment of this solution, the auxiliary cleaning component includes a U-shaped auxiliary cleaning rod located on the top surface of the filter separation screen and fixed to the outer wall of the output shaft of the servo motor. The U-shaped auxiliary cleaning rod is arranged horizontally on the top surface of the filter separation screen.

[0013] In this preferred embodiment, the U-shaped auxiliary cleaning rod includes a lower cleaning rod, a side cleaning rod, and an upper cleaning rod that are integrally connected together.

[0014] In a preferred embodiment, the top surface of the tail powder recovery tank is bolted with a detachable top cover, and the tail powder input component includes a recovery injection pipe that runs longitudinally through the center of the top surface of the detachable top cover and an input connection pipe that passes through and connects to the top of the recovery injection pipe.

[0015] In a preferred embodiment, a fixed vertical shaft extending longitudinally into the recovery injection pipe is welded to the top surface of the end of the upper cleaning rod away from the side cleaning rod. Anti-clogging stirring and dust scraping plates are symmetrically welded to the outer periphery of the fixed vertical shaft, and the free end of the anti-clogging stirring and dust scraping plates abuts and rubs against the inner wall of the recovery injection pipe.

[0016] Compared with the prior art, the technical effects and advantages of this utility model are as follows:

[0017] This quartz sand production tailings recovery device features a filter screen installed inside the tailings recovery tank. This screen has a specific aperture design for preliminary screening of the incoming quartz sand. A servo motor drives an anti-clogging scraper to rotate on the top surface of the filter screen, pushing the unrolled quartz sand towards the separation and discharge ramp. Compared to existing technologies, this design ensures that only quartz sand particles meeting the actual particle size requirements can pass through the screen and fall to the bottom of the tailings recovery tank, achieving a rapid and effective screening process and improving screening efficiency.

[0018] A servo motor drives an anti-clogging scraper to rotate on the top surface of the filter screen. This not only pushes unrolled quartz sand towards the separation and discharge ramp, but also effectively scrapes away and prevents quartz sand from clogging the screen mesh. Compared to existing technologies, this significantly reduces the increased maintenance frequency caused by screen clogging. Traditional screen designs often overlook the problem of tail powder particles easily clogging the mesh, leading to frequent shutdowns for cleaning and severely impacting production continuity. This technical solution, through an automated cleaning structure, reduces the risk of screen clogging, enabling the equipment to operate stably for extended periods and reducing maintenance costs and time consumption.

[0019] The electric lifting rod controls the raising and lowering of the discharge lifting arc plate. When it is necessary to discharge large particles of unfiltered quartz sand, the electric lifting rod lowers the discharge lifting arc plate, allowing the large particles of quartz sand to fall into the separation channel through the discharge gap. Compared with the existing technology, this not only achieves effective classification and recycling of quartz sand of different particle sizes, but also ensures the maximum utilization of resources in the tailings powder treatment process and reduces waste. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the installation structure of the filter separation screen and tail powder recovery tank of this utility model;

[0023] Figure 3 This is a schematic diagram of the connection structure of the filter separation screen of this utility model;

[0024] Figure 4 This is a schematic diagram of the lowering state of the material feeding lifting arc plate of this utility model;

[0025] Figure 5 This is a schematic diagram of the mounting structure of the servo motor of this utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the U-shaped auxiliary cleaning rod of this utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] In the diagram: 1. Tail powder recovery tank; 2. Removable top cover; 3. Recovery injection pipe; 4. Input connection pipe; 5. Upper discharge pipe; 6. Removable maintenance side plate; 7. Lower discharge pipe; 8. Filter separation screen; 9. U-shaped auxiliary cleaning rod; 10. Auxiliary cleaning component; 11. Separation discharge ramp end; 12. Arc-shaped enclosure plate; 13. Discharge slide ramp; 14. Anti-clogging scraper; 15. Anti-clogging mixing dust scraper; 16. U-shaped support frame rod; 17. Electric lifting rod; 18. Discharge lifting arc plate; 19. Sealed bearing; 20. Discharge notch gap; 21. Servo motor; 22. Lower cleaning rod; 23. Side cleaning rod; 24. Upper cleaning rod; 25. Fixed vertical shaft. Detailed Implementation

[0029] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0030] Unless otherwise defined, the directions mentioned herein, such as up, down, left, right, front, back, inside, and outside, are based on the directions shown in the figures of this utility model, and are explained here together.

[0031] This embodiment provides, for example Figures 1 to 6The illustrated device for recovering tailings from quartz sand production includes a tailings recovery tank 1. The top of the tank 1 has a tailings input component for inputting tailings during quartz sand production. A filter screen 8 is fixedly installed in the upper part of the inner cavity of the tank 1. One end of the top surface of the filter screen 8 has a separating discharge ramp 11, causing the top surface of the filter screen 8 to slope downwards. A discharge lifting arc plate 18 is located near the end of the filter screen 8 close to the separating discharge ramp 11. When the discharge lifting arc plate 18 and the filter screen 8 are joined together, they form a circular structure when viewed from above. A U-shaped support rod 16 is fixed below and between the inner walls of the tail powder recovery tank 1. A servo motor 21 is installed in the middle of the inner wall of the U-shaped support rod 16. The output shaft of the servo motor 21 rotates longitudinally through to the top of the filter screen 8 and anti-clogging scraper rods 14 are symmetrically welded to the output shaft. An electric lifting rod 17 is installed on one side of the servo motor 21 and longitudinally on the inner wall of the U-shaped support rod 16. The top of the electric lifting rod 17 is connected to the bottom surface of the discharge lifting arc plate 18. Below the discharge lifting arc plate 18 and in the inner cavity of the tail powder recovery tank 1, there is a separation channel for the quartz sand that has not been filtered and separated by the filter screen 8 to be discharged. When quartz sand enters the inner cavity of the tailings recovery tank 1 through the tailings input component, the servo motor 21 drives the anti-clogging scraper 14 to rotate on the top surface of the filter screen 8 via the output shaft. A portion of the tailings, containing quartz sand that meets the pore size requirements of the filter screen 8, falls to the lower part of the inner cavity of the tailings recovery tank 1 for centralized discharge. The remaining quartz sand, not filtered by the filter screen 8, slides down the inclined slope of the top surface of the filter screen 8 and rolls towards the separation discharge ramp end 11. Furthermore, when the servo motor 21 drives the anti-clogging scraper 14 to rotate, it scrapes out the quartz sand that has not rolled on the top surface of the filter screen 8, as well as some of the quartz sand that is blocked in the mesh of the filter screen 8. This is pushed out by the rotating anti-clogging scraper 14. During this pushing process, because the terrain at the separation discharge ramp end 11 is lower, it... The pushed quartz sand is thrown to the separation and discharge ramp end 11. At this time, the electric lifting rod 17 drives the discharge lifting arc plate 18 to descend, causing the discharge lifting arc plate 18 to separate from the separation and discharge ramp end 11. This allows the quartz sand located at the separation and discharge ramp end 11 that has not been filtered by the filter screen 8 to slide down from the discharge gap 20 between the discharge lifting arc plate 18 and the separation and discharge ramp end 11 into the separation channel for separation and discharge. This achieves both centralized recycling of quartz sand tailings that meet the particle size requirements by the filter screen 8 and centralized recycling of quartz sand tailings that do not meet the particle size requirements by the filter screen 8. In addition, the anti-clogging scraper 14 can scrape out the quartz sand tailings that are blocked in the mesh of the filter screen 8, reducing clogging.A sealed bearing 19 is longitudinally embedded in the center of the top surface of the filter screen 8, so that the output shaft of the servo motor 21 is interference-fitted with the inner ring of the sealed bearing 19, which helps the servo motor 21 drive the anti-clogging scraper 14 to rotate.

[0032] In this embodiment, the separation channel includes an arc-shaped enclosure plate 12 fixed to the bottom surface of the filter separation screen 8 near the bottom of the separation discharge slope 11, and a discharge slope body 13 integrally connected to the bottom of the arc-shaped enclosure plate 12.

[0033] In this embodiment, the inner edge of the arc-shaped enclosure plate 12 is sealed together with the inner wall of the tailings recovery tank 1 to form a separation channel for the discharge of separated quartz sand tailings.

[0034] In this embodiment, a discharge port is provided on the outer periphery of the tail powder recovery tank 1 and on the side facing the discharge slope 13. A detachable maintenance side plate 6 is installed on the discharge port by screws.

[0035] In this embodiment, an upper discharge pipe 5 is connected to the outer wall of the detachable maintenance side plate 6. One end of the upper discharge pipe 5 passes through the detachable maintenance side plate 6 and extends to the discharge ramp 13 of the separation channel. This allows unfiltered quartz sand tailings to be discharged from the upper discharge pipe 5 along the discharge ramp 13. A lower discharge pipe 7 is connected to the outer wall of the bottom periphery of the tailings recovery tank 1, allowing quartz sand tailings that meet the particle size requirements of the filter screen 8 to be discharged from the lower discharge pipe 7.

[0036] In this embodiment, an auxiliary cleaning component 10 is provided above the filter separation screen 8. The auxiliary cleaning component 10 can be driven to rotate by the servo motor 21 on the top surface of the filter separation screen 8, so that the auxiliary cleaning component 10 cleans the attached tail powder in the space above the filter separation screen 8.

[0037] In this embodiment, the auxiliary cleaning component 10 includes a U-shaped auxiliary cleaning rod 9 located on the top surface of the filter separation screen 8 and fixed to the outer wall of the output shaft of the servo motor 21. The U-shaped auxiliary cleaning rod 9 is arranged horizontally on the top surface of the filter separation screen 8.

[0038] In this embodiment, the U-shaped auxiliary cleaning rod 9 includes a lower cleaning rod 22, a side cleaning rod 23, and an upper cleaning rod 24 integrally connected together. The bottom surface of the lower cleaning rod 22 abuts against the top surface of the filter separation screen 8 and can further clean the top surface of the filter separation screen 8. The outer wall of the side cleaning rod 23 abuts against and rubs against the inner wall of the tail powder recovery tank 1 in the space above the filter separation screen 8, so that the side cleaning rod 23 cleans and scrapes off the tail powder attached to the inner wall above the tail powder recovery tank 1. The top surface of the upper cleaning rod 24 abuts against and rubs against the inner wall of the detachable top cover 2 and can scrape off and clean the tail powder attached to the inner wall of the detachable top cover 2.

[0039] In this embodiment, a removable top cover 2 is bolted to the top surface of the tailings recovery tank 1. The tailings input assembly includes a recovery injection pipe 3 that runs longitudinally through the center of the top surface of the removable top cover 2 and an input connection pipe 4 that connects to the top of the recovery injection pipe 3. The free end of the input connection pipe 4 is connected to the discharge pipe of the tailings from the quartz sand production, so that the tailings can be input from the input connection pipe 4 and the recovery injection pipe 3 into the tailings recovery tank 1 to contact the filter separation screen 8 after discharge.

[0040] In this embodiment, a fixed vertical shaft 25 extending longitudinally into the recovery injection pipe 3 is welded to the top surface of the upper cleaning rod 24 away from the side cleaning rod 23. Anti-clogging stirring and dust scraping plates 15 are symmetrically welded to the outer periphery of the fixed vertical shaft 25. The free end of the anti-clogging stirring and dust scraping plates 15 abuts and rubs against the inner wall of the recovery injection pipe 3. When the servo motor 21 drives the anti-clogging scraper 14 and the U-shaped auxiliary cleaning rod 9 through its output shaft, the fixed vertical shaft 25 drives the anti-clogging stirring and dust scraping plates 15 to rotate in the recovery injection pipe 3. This not only stirs and prevents clogging of the quartz sand tailings in the recovery injection pipe 3 but also scrapes away the tailings adhering to the inner wall of the recovery injection pipe 3.

[0041] Working principle

[0042] This quartz sand production tailings recovery device allows tailings to enter the tailings recovery tank 1 via a tailings input component. The input connection pipe 4 is connected to the tailings discharge pipe in the quartz sand production line, enabling the tailings to be directly discharged from the production line into the tailings recovery tank 1. Upon entering the tailings recovery tank 1, the tailings first come into contact with the filter screen 8, which is installed in the upper part of the inner cavity of the tailings recovery tank 1. The filter screen 8 has the required aperture size on site, enabling preliminary screening of the quartz sand according to particle size requirements. Fine quartz sand particles that meet the particle size requirements will fall to the bottom of the tailings recovery tank 1 through the filter screen 8, while small quartz sand particles that meet the filtration particle size requirements will be discharged from the bottom of the tailings recovery tank 1 through the lower discharge pipe 7.

[0043] Larger particles of quartz sand that are not filtered by the filter screen 8 will roll down the inclined separation and discharge ramp end 11 on the top surface of the filter screen 8 under the action of gravity. This design helps guide these larger particles to the designated area. When the servo motor 21 is running, its output shaft drives the anti-clogging scraper 14 to rotate. The anti-clogging scraper 14 is located at the top of the filter screen 8. It can not only push the unrolled quartz sand to the separation and discharge ramp end 11, but also effectively scrape off and prevent the quartz sand from clogging the mesh of the filter screen 8.

[0044] When it is necessary to discharge unfiltered large particles of quartz sand, the electric lifting rod 17 is activated, causing the discharge lifting arc plate 18 to descend. When the discharge lifting arc plate 18 separates from the separation discharge ramp end 11, the large particles of quartz sand will fall into the separation channel through the discharge gap 20. The separation channel is composed of an arc-shaped enclosure plate 12 fixed to the bottom surface of the filter separation screen 8 near the bottom of the separation discharge ramp end 11 and a discharge ramp body 13 integrally connected to the bottom end of the arc-shaped enclosure plate 12. The unfiltered quartz sand is discharged from the upper discharge pipe 5 along the discharge ramp body 13.

[0045] When it is necessary to clean the attached tail powder, the lower cleaning rod 22, the side cleaning rod 23 and the upper cleaning rod 24 rotate under the drive of the servo motor 21. This can clean the attached tail powder on the surface of the filter separation screen 8, the upper inner wall of the tail powder recovery tank 1 and the inner wall of the removable top cover 2, ensuring the cleanliness and efficiency of the equipment. Meanwhile, the fixed vertical shaft 25 and its anti-clogging stirring dust scraper 15 rotate under the action of the servo motor 21 to prevent blockage inside the recovery injection pipe 3 and remove residual tail powder on the inner wall of the anti-clogging stirring dust scraper 15. The cleaned-up tail powder falls onto the filter separation screen 8 and participates in filtration and separation again.

[0046] It should be noted that, in this document, relational terms such as "one" and "two" are used merely 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, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quartz sand production tailings recovery device comprising a tailings recovery tank (1), characterized in that: The top of the tail powder recovery tank (1) has a tail powder input assembly for inputting tail powder during quartz sand production, a filtering and separating screen (8) is fixedly installed on the upper part of the inner cavity of the tail powder recovery tank (1), one end of the top surface of the filtering and separating screen (8) is provided with a separated discharge slide end (11), so that the top surface of the filtering and separating screen (8) has a downward inclination trend, one end of the filtering and separating screen (8) close to the separated discharge slide end (11) is provided with a discharge lifting arc-shaped plate (18), and the discharge lifting arc-shaped plate (18) and the filtering and separating screen (8) are spliced together to form a circular structure in plan view. A U-shaped support frame rod (16) is fixed between the inner walls of the tail powder recovery tank (1) below the filtering and separating screen (8), a servo motor (21) is installed in the middle of the inner wall of the U-shaped support frame rod (16), the output shaft of the servo motor (21) is longitudinally rotated to penetrate the top end of the filtering and separating screen (8) and is symmetrically welded with an anti-blocking scraping rod (14) on the output shaft, an electric lifting rod (17) is longitudinally installed on one side of the servo motor (21) and in the inner wall of the U-shaped support frame rod (16), the top end of the electric lifting rod (17) is connected with the bottom surface of the discharge lifting arc-shaped plate (18), and a separated flow channel for discharging quartz sand separated from the filtering and separating screen (8) is formed in the inner cavity of the tail powder recovery tank (1) below the discharge lifting arc-shaped plate (18).

2. A quartz sand production tailings recovery device according to claim 1, characterized in that: The separated flow channel comprises an arc-shaped enclosing plate (12) fixed to the bottom surface of one end of the filtering and separating screen (8) close to the separated discharge slide end (11) and a discharge lower slide body (13) integrally connected to the bottom end of the arc-shaped enclosing plate (12).

3. A quartz sand production tailings recovery device according to claim 2, characterized in that: The inner wall edge side of the arc-shaped enclosing plate (12) is sealingly connected with the inner wall of the tail powder recovery tank (1) to form a separated flow channel for discharging separated quartz sand tail powder.

4. A quartz sand production tailings recovery device according to claim 2, characterized in that: A discharge port is formed on one side of the outer wall of the tail powder recovery tank (1) and faces the discharge lower slide body (13), and a detachable maintenance side plate (6) is installed on the discharge port by screws.

5. A quartz sand production tailings recovery device according to claim 4, characterized in that: An upper discharge pipe (5) is connected through the outer wall of the detachable maintenance side plate (6), and one end of the upper discharge pipe (5) penetrates the detachable maintenance side plate (6) and extends to the discharge lower slide body (13) of the separated flow channel.

6. A quartz sand production tailings recovery device according to claim 1, characterized in that: An auxiliary cleaning assembly (10) is arranged above the filtering and separating screen (8), the auxiliary cleaning assembly (10) can be driven to rotate on the top surface of the filtering and separating screen (8) by the servo motor (21), so that the auxiliary cleaning assembly (10) cleans the attached tail powder in the space above the filtering and separating screen (8).

7. A quartz sand production tailings recovery device according to claim 6, characterized in that: The auxiliary cleaning assembly (10) comprises a U-shaped auxiliary cleaning rod (9) fixed to the output shaft of the servo motor (21) and arranged on the top surface of the filtering and separating screen (8) in a horizontal state.

8. A quartz sand production tailings recovery device according to claim 7, characterized in that: The U-shaped auxiliary cleaning rod (9) comprises a lower cleaning rod (22), a side cleaning rod (23) and an upper cleaning rod (24) integrally connected together. The U-shaped auxiliary cleaning rod (9) comprises a lower cleaning rod (22), a side cleaning rod (23) and an upper cleaning rod (24) integrally connected together.

9. A quartz sand production tailings recovery device according to claim 8, characterized in that: The top surface of the tail powder recovery tank (1) is bolted with a detachable top cover (2), the tail powder input assembly comprises a recovery injection pipe (3) longitudinally penetrating the center position of the top surface of the detachable top cover (2) and an input connecting pipe (4) penetratingly connected to the top end of the recovery injection pipe (3).

10. A quartz sand production tailings recovery device according to claim 9, characterized in that: The top surface of the one end of the upper cleaning rod (24) away from the side cleaning rod (23) is welded with a fixed vertical shaft (25) extending longitudinally into the recovery injection pipe (3), the outer wall of the circumference of the fixed vertical shaft (25) is symmetrically welded with an anti-blocking stirring and dust scraping plate (15), and the free end of the anti-blocking stirring and dust scraping plate (15) abuts and rubs against the inner wall of the recovery injection pipe (3).

Images