Reverse blowing type cloth bag multi-stage dust removal equipment

Abstract

The utility model discloses reverse blowing type cloth bag multistage dust removal equipment, which relates to the technical field of dust removal equipment and comprises a dust removal box, an exhaust fan is arranged on one side of the top of the dust removal box in a penetrating manner, a cloth bag frame is arranged in the dust removal box, a plurality of cloth bags are arranged at the top end of the cloth bag frame in a penetrating manner, and fixing plates are sleeved outside the top ends of the cloth bags. The two ends of the bottom of the fixing plate are connected with the top end of the cloth bag frame through connecting assemblies, a plurality of fixing grooves matched with the connecting assemblies are formed in the top end of the cloth bag frame, and a supporting plate is arranged on the side wall of one end of the dust removal box. The dust removal device is reasonable and reliable in structure and simple to operate, and can realize efficient dust-containing gas filtration, back-blowing dust removal and purified gas emission through the matched arrangement of the exhaust fan, the cloth bag, the connecting pipeline, the dust removal gas bag, the electromagnetic pulse valve, the blowing pipe, the gas outlet pipe, the Venturi pipe and the gas inlet; therefore, the dust removal efficiency of the reverse blowing type cloth bag multi-stage dust removal equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of dust removal equipment technology, specifically to a reverse-blowing type multi-stage dust removal equipment using filter bags. Background Technology

[0002] In industries such as cement plants, mines, and chemicals, large amounts of dust are generated during production processes, which, if left untreated, will have a significant impact on the environment. The dust problem is particularly prominent in the processing of kaolin. Kaolin processing involves crushing, screening, and drying, each step generating a large amount of fine dust. This dust not only affects the working environment but can also harm workers' health. Multi-stage baghouse dust collectors are dry dust filtration devices suitable for capturing fine, dry, non-fibrous dust. The filter bags are made of woven filter cloth or non-woven felt, utilizing the filtration effect of the fibrous fabric to filter dust-laden gas. When dust-laden gas enters the baghouse dust collector, larger, heavier dust particles settle due to gravity and fall into the ash hopper; the gas containing finer dust particles is purified as it passes through the filter media, where the dust is trapped. However, after prolonged use, existing reverse-jet baghouse multi-stage dust collectors are not convenient for quick replacement and cleaning of the filter bags, which affects the subsequent dust removal efficiency. Furthermore, dust can easily cause blockage of the discharge hopper during the discharge process, thus affecting the discharge speed.

[0003] For example, Chinese patent CN219186217U discloses a multi-stage filtration device for a bag dust collector, including a support foot, a feeding box fixedly connected to the top of the support foot, a processing box fixedly connected to the top of the feeding box, and a dust storage box fixedly connected to the middle of the bottom of the feeding box. The processing box is equipped with an auxiliary mechanism, a dust filtering mechanism, and a dust removal mechanism. The auxiliary mechanism includes a support frame, a motor box, a motor, a fixing plate, a spring, a connecting plate, and an elliptical disc.

[0004] The multi-stage filtration device of this baghouse dust collector has the following disadvantages: Although the motor drives the elliptical disc to rotate during operation, and the elliptical disc contacts the connecting plate during rotation, which can squeeze the connecting plate and make the connecting frame shake up and down, and together with the air outlet at the bottom of the blower frame, the dust removal effect can be improved. The dust that falls off can be guided into the ash storage box through the feeding box for unified dust collection. However, after long-term use, it is not convenient to quickly replace and clean the filter bags, thus affecting the subsequent dust removal efficiency. In addition, dust can easily cause blockage of the discharge hopper during the discharge process, thereby affecting the discharge speed.

[0005] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0006] In view of the problems in the related technologies, this utility model proposes a reverse-flushing bag multi-stage dust collector to overcome the above-mentioned technical problems existing in the existing related technologies.

[0007] Therefore, the specific technical solution adopted by this utility model is as follows:

[0008] A reverse-flushing baghouse multi-stage dust collector includes a dust collection box. An exhaust fan is installed through one side of the top of the dust collection box. A bag frame is installed inside the dust collection box, and several filter bags are installed through the top of the bag frame. Each filter bag has a fixing plate fitted over its top. The bottom ends of the fixing plates are connected to the top of the bag frame via connecting components. The top of the bag frame has several fixing grooves that mate with the connecting components. A support plate is installed on one side wall of the dust collection box, and a connecting pipe is installed at the top of the support plate. One end of the connecting pipe... A dust collection air manifold is installed through the side wall. Several electromagnetic pulse valves are connected through the top outer wall of the connecting pipes. Each electromagnetic pulse valve is connected to a blow pipe that penetrates the side wall of the dust collection box. Each blow pipe is connected to an air outlet pipe through a rotary joint on one side. The bottom of each air outlet pipe is connected to a Venturi tube that matches the filter bag. A discharge hopper is installed at the bottom of the dust collection box. A discharge assembly is installed at the bottom of the discharge hopper. An air inlet is installed through the side wall of one end of the discharge hopper. A support frame is installed at the bottom of the dust collection box. A control panel is installed on one side of the support frame.

[0009] Furthermore, to enable rapid installation and disassembly of the filter bags through the connecting components, preventing damage to the bags after prolonged use and ensuring efficient dust removal, thus improving the convenience and efficiency of the reverse-flushing bag filter multi-stage dust collector and broadening its applicability, the connecting components include a disc housed inside a fixed groove. Several insert rods are provided on the side walls of the disc, and a rotating shaft is located at the top of the disc. Several insertion holes that mate with the insert rods are opened on the inner wall of the fixed groove. Several sliding grooves that mate with the insert rods are opened on the outer circumference of the disc, with a limiting groove at one end of each groove. A fixed shaft is located at the center of the top of the disc, and a limiting rod that mates with the limiting groove is located at the top of one end of each insert rod. A rotating hole (I) that mates with the fixed shaft is located at the center of the bottom of the rotating shaft, and several rotating holes (II) that mate with the limiting rods are eccentrically located on the side wall of the bottom of the rotating shaft, with the rotating holes (II) having an arc-shaped structure.

[0010] Furthermore, in order to ensure that the reverse-flushing baghouse multi-stage dust collector does not accumulate and clog due to excessive dust during discharge, and thus ensures more uniform and rapid dust discharge, thereby improving the working efficiency of the reverse-flushing baghouse multi-stage dust collector, the discharge component includes stabilizing plates on both sides of the bottom of the discharge hopper. A fixing frame is provided at the bottom of the stabilizing plate, and fixing blocks are symmetrically arranged on both sides of the fixing frame. A groove is provided in the middle of the fixing frame. A servo motor is provided through one end of the fixing block and through one end of the side wall of the fixing block. The output end of the servo motor is connected to a rotating roller, and a feeding groove is provided on the circumferential side wall of the rotating roller.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. This utility model has a reasonable and reliable structure and is simple to operate. Through the coordinated arrangement of the exhaust fan, filter bags, connecting pipes, dust collector air manifold, electromagnetic pulse valve, blowpipe, outlet pipe and venturi tube, and inlet, it can achieve efficient dust-laden gas filtration, back-flushing cleaning, and purified gas emission, thereby improving the dust removal efficiency of this back-flushing bag multi-stage dust collector. Furthermore, with the help of the connecting components, the filter bags can be quickly installed and disassembled, avoiding damage to the filter bags after long-term use and affecting subsequent dust removal efficiency. At the same time, with the help of the discharge components, it can ensure that the back-flushing bag multi-stage dust collector will not accumulate and clog due to excessive dust during discharge, thus improving the working efficiency of the back-flushing bag multi-stage dust collector and making it more widely applicable.

[0013] 2. By setting up the connecting component, when the bag needs to be installed, place the connecting component inside the fixing groove, and then rotate the rotating shaft clockwise. The rotating shaft rotates clockwise around the first rotating hole, and with the cooperation of the second rotating hole and the limiting rod, the limiting rod moves away from the fixing shaft. When the limiting rod moves away from the fixing shaft, the insert rod moves outward within the sliding groove. When the end of the insert rod moves into the insert hole, stop rotating the rotating shaft. This allows the fixing plate to be installed on the top of the bag frame, thus completing the installation of the bag. When the bag needs to be replaced... When the rotation shaft is turned in reverse, it rotates around the first rotating hole. With the cooperation of the second rotating hole and the limiting rod, the limiting rod moves closer to the fixed shaft. When the limiting rod moves closer to the fixed shaft, the insertion rod moves inward in the groove. When the end of the insertion rod leaves the insertion hole, the rotation shaft is stopped, and the fixing plate can be removed from the top of the bag frame for replacement. This allows for quick installation and removal of the bag, improving the convenience and dust removal efficiency of the reverse-blowing bag multi-stage dust collector, and making it more widely applicable.

[0014] 3. By setting up the discharge component, when there is a lot of dust inside the discharge hopper, the servo motor is started through the control panel to drive the rotating roller to rotate. When the feed chute rotates to face the bottom of the discharge hopper, the dust accumulated in the discharge hopper enters the feed chute. When the feed chute is full of dust, the servo motor is started again to drive the rotating roller to rotate. Then, when the feed chute rotates to face away from the bottom of the discharge hopper, the dust inside the feed chute comes out from the feed chute due to gravity, thus completing the uniform and rapid discharge of dust. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a perspective view of a reverse-blowing bag filter multi-stage dust collector according to an embodiment of the present utility model;

[0017] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0018] Figure 3 This is a cross-sectional view of a reverse-flushing bag filter multi-stage dust collector according to an embodiment of the present utility model;

[0019] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle;

[0020] Figure 5 yes Figure 3 A magnified view of a section at point C;

[0021] Figure 6 This is a schematic diagram of the bag frame structure in a reverse-blowing bag multi-stage dust collector according to an embodiment of the present utility model;

[0022] Figure 7 yes Figure 6 A magnified view of a section at point D;

[0023] Figure 8 This is a structural schematic diagram of the connecting components in a reverse-blowing baghouse multi-stage dust collector according to an embodiment of the present utility model;

[0024] Figure 9 This is a cross-sectional view of the connecting components in a reverse-blowing baghouse multi-stage dust collector according to an embodiment of the present utility model;

[0025] Figure 10This is a three-dimensional assembly drawing of the connecting components in a reverse-blowing bag multi-stage dust collector according to an embodiment of the present utility model;

[0026] Figure 11 This is a schematic diagram of the structure of the rotating shaft in a reverse-blowing baghouse multi-stage dust collector according to an embodiment of the present utility model;

[0027] Figure 12 This is a schematic diagram of the discharge component in a reverse-blowing baghouse multi-stage dust collector according to an embodiment of the present utility model;

[0028] Figure 13 This is a three-dimensional assembly drawing of the discharge component in a reverse-blowing baghouse multi-stage dust collector according to an embodiment of the present utility model.

[0029] In the picture:

[0030] 1. Dust collector box; 2. Exhaust fan; 3. Bag frame; 4. Bag; 5. Fixing plate; 6. Connecting assembly; 601. Disc; 6011. Slide groove; 6012. Limiting groove; 6013. Fixing shaft; 602. Insert rod; 6021. Limiting rod; 603. Rotating shaft; 6031. Rotating hole one; 6032. Rotating hole two; 604. Inserting hole; 7. Fixing groove; 8. Support plate; 9. Connecting pipe; 10. 11. Dust and air manifold; 12. Electromagnetic pulse valve; 13. Blowpipe; 14. Rotary joint; 15. Air outlet pipe; 16. Venturi tube; 17. Discharge hopper; 18. Discharge assembly; 19. Stabilizing plate; 10. Fixing frame; 10. Fixing block; 11. Groove; 12. Servo motor; 13. Transfer roller; 14. Feed chute; 15. Air inlet; 16. Support frame; 27. Control panel. Detailed Implementation

[0031] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0032] According to an embodiment of the present invention, a reverse-flushing bag filter multi-stage dust removal device is provided.

[0033] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figures 1-13As shown, the reverse-flushing baghouse multi-stage dust collector according to an embodiment of this utility model includes a dust collection box 1. In specific applications, the top of the dust collection box 1 is symmetrically provided with doors. An exhaust fan 2 is installed through one side of the top of the dust collection box 1. A bag frame 3 is provided inside the dust collection box 1. Several bags 4 are installed through the top of the bag frame 3. A fixing plate 5 is fitted on the outside of the top of each bag 4. The bottom two ends of the fixing plate 5 are connected to the top of the bag frame 3 through connecting components 6. Several fixing grooves 7 are provided on the top of the bag frame 3 to cooperate with the connecting components 6. A support plate 8 is provided on one side wall of the dust collection box 1. A connecting pipe 9 is provided on the top of the support plate 8. A dust collection air manifold 10 is installed through one side wall of the connecting pipe 9. Several electromagnetic pulse valves 11 are connected through the top outer wall of the connecting pipe 9. A blow pipe 12 that penetrates the side wall of the dust collection box 1 is connected to one side of each electromagnetic pulse valve 11. An air outlet pipe 14 is connected to one side of each blow pipe 12 through a rotary joint 13. A venturi tube 15 that cooperates with the filter bag 4 is connected to the bottom of each air outlet pipe 14. A discharge hopper 16 is provided at the bottom of the dust collection box 1. A discharge assembly 17 is provided at the bottom of the discharge hopper 16. An air inlet 18 is installed through one side wall of the discharge hopper 16. A support frame 19 is provided at the bottom of the dust collection box 1. A control panel 20 is provided on one side of the support frame 19.

[0034] In addition, the working principles and structures of the exhaust fan 2, filter bag 4, dust collector 10, electromagnetic pulse valve 11, blow pipe 12, venturi tube 15, and servo motor 1705 are all existing technologies, and will not be elaborated on here.

[0035] In one embodiment, the connecting component 6 includes a disc 601 disposed inside a fixing groove 7. The sidewalls of the disc 601 are provided with a plurality of insert rods 602. A rotating shaft 603 is disposed at the top of the disc 601. The inner wall of the fixing groove 7 has a plurality of insertion holes 604 that mate with the insert rods 602. The outer circumferential wall of the disc 601 has a plurality of sliding grooves 6011 that mate with the insert rods 602. One end of each sliding groove 6011 has a limiting groove 6012. A fixing shaft 6013 is disposed at the center of the top of the disc 601. One end of each insert rod 602 has a limiting groove 6012. The limiting rod 6021 cooperates with the positioning groove 6012. The bottom center of the rotating shaft 603 is provided with a rotating hole 6031 that cooperates with the fixed shaft 6013. The bottom side wall of the rotating shaft 603 is eccentrically provided with several rotating holes 6032 that cooperate with the limiting rod 6021. The rotating holes 6032 are designed with an arc structure, which allows for quick installation and removal of the filter bag 4 under the action of the connecting component 6. This avoids damage to the filter bag 4 after long-term use, which would affect the subsequent dust removal efficiency. This improves the convenience and dust removal efficiency of the reverse-blowing bag multi-stage dust collector and makes it more widely applicable.

[0036] The specific working principle of the connecting component 6 is as follows: When the cloth bag 4 needs to be installed, the connecting component 6 is placed inside the fixing groove 7, and then the rotating shaft 603 is turned clockwise, so that the rotating shaft 603 rotates clockwise around the rotating hole 6031. With the cooperation of the rotating hole 6032 and the limiting rod 6021, the limiting rod 6021 is moved away from the fixing shaft 6013. When the limiting rod 6021 is away from the fixing shaft 6013, the insert rod 602 moves outward in the sliding groove 6011. When the end of the insert rod 602 moves into the insert hole 604, the rotating shaft 603 is stopped, so that the fixing plate 5 can be installed on the top of the cloth bag frame 3, thereby completing the installation of the cloth bag 4. When replacing the filter bag 4, the rotating shaft 603 is turned in reverse, causing the rotating shaft 603 to rotate around the rotating hole 6031. With the cooperation of the rotating hole 6032 and the limiting rod 6021, the limiting rod 6021 is brought closer to the fixed shaft 6013. When the limiting rod 6021 is close to the fixed shaft 6013, the insertion rod 602 moves inward in the sliding groove 6011. When the end of the insertion rod 602 leaves the insertion hole 604, the rotating shaft 603 is stopped, and the fixing plate 5 can be removed from the top of the filter bag frame 3 for replacement. This allows for quick installation and removal of the filter bag 4, improving the convenience and dust removal efficiency of the reverse-blowing bag multi-stage dust collector, and making it more widely applicable.

[0037] In one embodiment, the discharge assembly 17 includes stabilizing plates 1701 disposed on both sides of the bottom of the discharge hopper 16. A fixing frame 1702 is disposed at the bottom of the stabilizing plate 1701. Fixing blocks 1703 are symmetrically disposed on both sides of the fixing frame 1702. A groove 1704 is provided in the middle of the fixing frame 1702. A servo motor 1705 is disposed through one end of the fixing block 1703 and passes through one end sidewall of the fixing block 1703. The output end of the servo motor 1705 is connected to a rotating roller 1706. A feed groove 1707 is provided on the circumferential sidewall of the rotating roller 1706. Under the action of the discharge assembly 17, it can be ensured that the reverse-blowing bag multi-stage dust collector will not accumulate and block due to excessive dust during discharge. Thus, the dust discharge can be more uniform and faster, thereby improving the working efficiency of the reverse-blowing bag multi-stage dust collector.

[0038] The specific working principle of the discharge assembly 17 is as follows: When there is a lot of dust inside the discharge hopper 16, the servo motor 1705 is started through the control panel 20 to drive the rotating roller 1706 to rotate. When the feed trough 1707 rotates to face the bottom of the discharge hopper 16, the dust accumulated in the discharge hopper 16 enters the feed trough 1707. When the feed trough 1707 is full of dust (in specific applications, the time for the feed trough 1707 to be full can be obtained through pre-test experiments), the servo motor 1705 is started again to drive the rotating roller 1706 to rotate. Then, when the feed trough 1707 rotates to face away from the bottom of the discharge hopper 16, the dust inside the feed trough 1707 comes out of the feed trough 1707 due to gravity, thus completing the uniform and rapid discharge of dust.

[0039] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0040] In practical applications, dust-laden gas first enters the dust collector 1 through the inlet 18, and under the suction of the exhaust fan 2, it enters the filter bag 4 area along the connecting pipe 9. When the dust-laden gas passes through the filter bag 4, the filter bag 4 can effectively intercept the dust particles in the gas. Larger dust particles settle directly into the discharge hopper 16 under the action of gravity, while smaller dust particles are retained on the surface of the filter bag 4. Then, compressed air is sent to the electromagnetic pulse valve 11 through the dust collector air manifold 10, and the electromagnetic pulse valve 11 is opened in sequence through the control panel 20 to release high-pressure compressed air into the blowpipe 12. The high-pressure airflow reaches the Venturi tube through the blowpipe 12. Inside the inner tube 15, the airflow is accelerated through the venturi tube 15 to form a strong back-blowing airflow, which generates an instantaneous reverse impact on the inside of the filter bag 4, stripping the dust attached to the surface of the filter bag. The filtered gas is directly discharged through the exhaust fan 2. The dust that has detached from the surface of the filter bag 4 settles into the discharge hopper 16 under the action of gravity. Finally, the dust accumulated in the discharge hopper 16 is discharged through the discharge assembly 17. After long-term use, if the filter bag 4 needs to be replaced, the blow pipe 12 and the air outlet pipe 14 are separated by the rotary joint 13, and the air outlet pipe 14 is taken out. Then, the filter bag 4 can be quickly installed and removed through the connecting assembly 6.

[0041] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", 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 connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A reverse-flushing baghouse multi-stage dust collector, comprising a dust collection box (1), characterized in that, An exhaust fan (2) is installed through one side of the top of the dust collector (1). A bag frame (3) is installed inside the dust collector (1). Several bags (4) are installed through the top of the bag frame (3). A fixing plate (5) is fitted on the outside of the top of each bag (4). The bottom two ends of the fixing plate (5) are connected to the top of the bag frame (3) through a connecting component (6). The top of the bag frame (3) is provided with several fixing grooves (7) that cooperate with the connecting component (6). A support plate (8) is provided on one side wall of the dust collector (1). A connecting pipe (9) is provided on the top of the support plate (8). A dust collector air bag (10) is provided through one side wall of the connecting pipe (9). Several electromagnetic pulse valves (11) are connected through the top outer wall of the connecting pipe (9). A blow pipe (12) that penetrates the side wall of the dust collector (1) is connected to one side of each electromagnetic pulse valve (11). An air outlet pipe (14) is connected to one side of each blow pipe (12) through a rotary joint (13). A Venturi tube (15) that cooperates with the bag (4) is connected to the bottom of each air outlet pipe (14). The dust collector (1) is provided with a discharge hopper (16) at the bottom end, and a discharge assembly (17) is provided at the bottom end of the discharge hopper (16). An air inlet (18) is provided through one side wall of the discharge hopper (16). A support frame (19) is provided at the bottom of the dust collector (1), and a control panel (20) is provided on one side of the support frame (19).

2. The reverse-flushing baghouse multi-stage dust collector according to claim 1, characterized in that, The connecting component (6) includes a disc (601) disposed inside the fixing groove (7). The side walls of the disc (601) are provided with a plurality of insert rods (602). The top of the disc (601) is provided with a rotating shaft (603). The inner wall of the fixing groove (7) is provided with a plurality of insertion holes (604) that cooperate with the insert rods (602).

3. The reverse-flushing baghouse multi-stage dust collector according to claim 2, characterized in that, The outer circumferential wall of the disc (601) is provided with a plurality of sliding grooves (6011) that cooperate with the insert rod (602). A limiting groove (6012) is provided at one end of the sliding groove (6011), and a fixed shaft (6013) is provided at the middle of the top of the disc (601).

4. The reverse-flushing baghouse multi-stage dust collector according to claim 3, characterized in that, The top of one end of the insertion rod (602) is provided with a limiting rod (6021) that cooperates with the limiting groove (6012).

5. A reverse-flushing baghouse multi-stage dust collector according to claim 4, characterized in that, The rotating shaft (603) has a rotating hole (6031) at the bottom center that cooperates with the fixed shaft (6013). The rotating shaft (603) has a plurality of rotating holes (6032) eccentrically arranged on the bottom side wall that cooperate with the limiting rod (6021), and the rotating holes (6032) are set in an arc shape.

6. The reverse-flushing baghouse multi-stage dust collector according to claim 1, characterized in that, The discharge assembly (17) includes a stabilizing plate (1701) disposed on both sides of the bottom end of the discharge hopper (16), a fixing frame (1702) is disposed at the bottom end of the stabilizing plate (1701), and fixing blocks (1703) are symmetrically disposed on both sides of the fixing frame (1702).

7. A reverse-flushing baghouse multi-stage dust collector according to claim 6, characterized in that, The fixing frame (1702) has a groove (1704) in the middle. One end of the fixing block (1703) is provided with a servo motor (1705) through the side wall of the fixing block (1703). The output end of the servo motor (1705) is connected to a material transfer roller (1706). The circumferential side wall of the material transfer roller (1706) is provided with a feeding groove (1707).

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