Felt breaking device

Abstract

The present application belongs to the field of crushing device, especially a felt crushing device, comprising a crushing chamber, an extrusion chamber and a material stripping cavity are arranged inside the crushing chamber, a feeding port extending to outside of the crushing chamber is arranged on the upper side wall of the extrusion chamber, an extrusion block is arranged on the top of the inner cavity of the extrusion chamber, and the extrusion block is connected with an extrusion driving mechanism; a plurality of through holes are arranged on the lower part of the side wall of the extrusion chamber facing the material stripping cavity, an insertion column is arranged in the through hole, a movable plate is fixedly connected to one end of the insertion column, the other end is a pointed end, a plurality of hooks are arranged on the outer wall of the pointed end, the hooks are distributed in an umbrella shape, and the umbrella tip faces the pointed end of the insertion column; the movable plate is connected with a crushing driving mechanism, a separating mechanism for separating the felt from the insertion column is arranged in the material stripping cavity; and the material stripping cavity is connected with a discharging mechanism. The present application discards the rotating parts, all the moving parts are reciprocating linear motion, the possibility of fiber winding is eliminated, and the manual maintenance cost is reduced without stopping for cleaning.

Description

Technical Field

[0001] This invention belongs to the field of crushing devices, and in particular a felt crushing device. Background Technology

[0002] Felt is a common material for automotive trim. In the production of automotive trim, it is typically formed into the designed shape through stamping. The stamped parts are then trimmed to remove excess material from the edges. The trimmed scraps can be recycled. However, when recycling felt, it needs to be crushed first. Currently, the main shredding devices for felt-like fiber materials are rotary shredders, such as single-shaft or dual-shaft shredders. Because the shearing action of the cutter rollers is random, the processed material often contains large pieces of felt. This usually requires secondary processing with external screening equipment, making the overall process cumbersome and limiting crushing efficiency. Furthermore, because the cavity contains components such as the rotating main shaft, spacers, and pins, the fine fibers inside the felt easily become entangled on the surface of the rotating components. The continuous accumulation of entangled material increases the equipment load, causing the machine to stall and shut down. Frequent shutdowns and manual cleaning of the entangled fibers are necessary, making it difficult to meet the requirements of continuous operation. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a felt crushing device to solve the above-mentioned problem.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows: a felt crushing device, including a crushing chamber, an extrusion chamber and a desizing chamber are provided inside the crushing chamber, an inlet extending to the outside of the crushing chamber is provided on the upper side wall of the extrusion chamber, an extrusion block is provided at the top of the extrusion chamber and slides with the extrusion chamber in the vertical direction, and the extrusion block is connected to an extrusion drive mechanism. The lower part of the side wall of the extrusion chamber facing the descraping chamber has multiple through holes arranged in an array. Each through hole contains an insertion post. One end of the insertion post is fixedly connected to a movable plate, and the other end is a pointed tip. The outer wall of the pointed tip is provided with multiple hooks arranged in an umbrella shape, with the tips of the umbrellas facing the tip of the insertion post. The movable plate is connected to a crushing drive mechanism, which drives the movable plate to move back and forth in a linear motion, so that the insertion post and hooks reciprocate in and out of the extrusion chamber. The unloading chamber is equipped with a separation mechanism for separating the felt from the insert post; the separation mechanism includes a fixed plate fixedly disposed between the movable plate and the through hole, the insert post penetrates the side wall of the fixed plate and slides with the fixed plate, each insert post has multiple axially extending grooves on its outer wall, the grooves are located between two adjacent hooks, each groove has a slice that slides with the groove, one end of the slice is fixedly disposed on the side wall of the fixed plate; The discharge chamber is connected to a discharge mechanism for discharging the felt into the outside of the crushing chamber.

[0005] Furthermore, the movable plate is provided with an air chamber, which is connected to an air supply mechanism; each insertion column is provided with an air passage, and the side wall of the insertion column inside the hook is provided with an air jet hole. One end of the air passage is connected to the air chamber, and the other end is connected to the air jet hole.

[0006] Furthermore, the hook is in the shape of a right triangle, with one right-angled side fixedly connected to the insertion post, and the other right-angled side perpendicular to the insertion post.

[0007] Furthermore, the insertion columns and through holes are arranged in a rectangular array, and a vertical partition is provided between two adjacent vertical rows of insertion columns. The upper end of the partition is connected to the top wall of the discharge chamber, and the two sides of the partition are connected to the fixed plate and the outer wall of the extrusion chamber, respectively. The discharge mechanism includes a discharge channel, which is located below the partition and extends to the outside of the crushing chamber.

[0008] Furthermore, an inclined screen is installed in the discharge channel, and an inclined impurity discharge trough is installed below the screen.

[0009] Furthermore, the edge of the screen is provided with a frame, which is located in the impurity discharge groove and slides in the vertical direction with the impurity discharge groove. A spring is provided on the lower surface of the frame, and a driven block is provided on the upper surface of the frame. The upper surface of the driven block is inclined downward or upward along the movement direction of the movable plate. A driving member is provided at the lower end of the movable plate, and the bottom of the driving member is in contact with the upper surface of the driven block.

[0010] Furthermore, the bottom wall of the crushing chamber is provided with a removable impurity collection trough.

[0011] The beneficial effects of this invention are as follows: 1. In the prior art, felt fibers easily become entangled on rotating components such as the rotating spindle and spacers, and the entanglement becomes increasingly tighter as the rotating components rotate, requiring frequent machine stops for cleaning. This invention eliminates rotating parts; all moving parts undergo reciprocating linear motion, structurally eliminating the possibility of fiber entanglement, reducing the frequency of machine stops for cleaning, and lowering manual maintenance costs. In this invention, the fiber bundles hooked by the claws only adhere to the outer wall of the insertion column and do not form a tightly wrapped structure. Unlike the tightly wrapped layer formed on the rotating spindle in the prior art, the separation mechanism can effectively remove the fiber bundles from the insertion column.

[0012] 2. This invention features multiple through-holes on the side wall of the extrusion chamber. After the hook grabs the felt fibers, they pass through these through-holes back to the descrambling chamber. During this process, the diameter of the through-holes restricts the volume of the felt: smaller felt fibers can pass smoothly through the through-holes and enter the descrambling chamber, while larger felt fibers are blocked by the edges of the through-holes and are torn into smaller pieces. Therefore, in each cycle, the volume of the fiber bundle carried out by the hook is strictly constrained by the diameter of the through-holes, preventing the generation of large pieces of material. This ensures that uniformly sized loose fiber bundles can be obtained in a single process, eliminating the need for screening and secondary processing. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall front view and cross-section of the present invention; Figure 2 yes Figure 1 Schematic diagram of the AA section; Figure 3 yes Figure 1 Enlarged schematic diagram of part B; Figure 4 yes Figure 2 An enlarged schematic diagram of section C; Reference numerals: 1—Extrusion chamber; 2—Feed inlet; 3—Extrusion block; 4—Extrusion drive mechanism; 5—Through hole; 6—Modible plate; 7—Insertion column; 8—Hook; 9—Crushing drive mechanism; 10—Crushing chamber; 11—Desiccation chamber; 12—Baffle plate; 13—Discharge channel; 14—Screen; 15—Impurity discharge trough; 16—Spring; 17—Fixed plate; 18—Slice; 19—Air chamber; 20—Air supply mechanism; 21—Air passage; 22—Air jet hole; 23—Driver block; 24—Driver component; 25—Impurity collection trough. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] The felt crushing device of the present invention, such as Figures 1 to 4As shown, the device includes a crushing chamber 10, inside which are a compression chamber 1 and a descraping chamber 11. A feed inlet 2 extending outside the crushing chamber 10 is provided on the upper side wall of the compression chamber 1. The feed inlet 2 is used to feed felt scraps into the compression chamber 1. The feed inlet 2 can be inclined so that the felt can automatically slide into the compression chamber 1. A compression block 3 is provided at the top of the inner cavity of the compression chamber 1, slidingly engaging with the compression chamber 1 in the vertical direction. The compression block 3 is used to compact the felt scraps. The compression block 3 is connected to a compression drive mechanism 4. The compression drive mechanism 4 can be existing equipment such as a linear motor, hydraulic cylinder, or pneumatic cylinder. The main body of the compression drive mechanism 4 is installed outside the crushing chamber 10, and its piston rod and other transmission mechanisms extend into the compression chamber 1. When the extrusion drive mechanism 4 drives the extrusion block 3 to move up and down, the extrusion block 3 can move to the top and bottom of the lower end of the feed port 2. Specifically, when adding felt to the extrusion chamber 1, the extrusion block 3 is located above the connection between the feed port 2 and the extrusion chamber 1. When extruding the felt in the extrusion chamber 1, the extrusion block 3 can move to the bottom of the connection between the feed port 2 and the extrusion chamber 1.

[0016] The lower part of the side wall of the extrusion chamber 1 facing the descraping chamber 11 has multiple through holes 5 arranged in an array. Each through hole 5 contains an insertion post 7. One end of the insertion post 7 is fixedly connected to a movable plate 6, and the other end is a pointed tip to pierce the compacted felt. The outer wall of the pointed tip is provided with multiple hooks 8, which can be three or four. The hooks 8 are arranged in an umbrella shape, with the umbrella tips facing the pointed tip of the insertion post 7. The hooks 8 can pass through the through holes 5. When the pointed tip of the insertion post 7 is inserted into the felt in the extrusion chamber 1, it can drive the hooks 8 to pierce the felt. The movable plate 6 is connected to a crushing drive mechanism 9, which drives the movable plate 6 to reciprocate linearly, causing the insertion post 7 and hooks 8 to reciprocate in and out of the extrusion chamber 1. The crushing drive mechanism 9 can be existing equipment such as a cylinder, linear motor, or hydraulic cylinder.

[0017] The insert column 7 and hook 8 first enter the compression chamber 1 and pierce the compacted felt, then move towards the discharge chamber 11. The hook 8 can drive part of the felt to move synchronously. When the felt moving with the hook 8 reaches the through hole 5, it is sheared by the port of the through hole 5, causing the large volume of felt to be torn into smaller volumes, so that it can move to the discharge chamber 11 through the through hole 5 with the hook 8. The reciprocating motion of the insert column 7 can continuously tear and break the felt.

[0018] The discharge chamber 11 is equipped with a separation mechanism for separating the felt from the insertion column 7, and the discharge chamber 11 is connected to a discharge mechanism for discharging the felt to the outside of the crushing chamber 10. As the hook 8 moves into the discharge chamber 11, the felt adheres to the insertion column 7, the separation mechanism separates the felt, and then discharges it through the discharge mechanism.

[0019] The felt crushing process of this invention is as follows: the extrusion block 3 compacts the felt in the extrusion chamber 1, and then the crushing drive mechanism 9 drives the movable plate 6 to move towards the extrusion chamber 1. The movable plate 6 drives the insertion post 7 to move, so that the tip of the insertion post 7 and the hook 8 enter the extrusion chamber 1 through the through hole 5. After the tip of the insertion post 7 and the hook 8 pierce the compacted felt, the crushing drive mechanism 9 drives the movable plate 6 to move in the opposite direction, moving the tip of the insertion post 7 and the hook 8 to the discharge chamber 11, where the hook 8 hooks out part of the felt. The extrusion block 3 can continuously apply appropriate pressure to the felt to ensure that the felt is always in a compacted state.

[0020] In its natural state, the felt is soft, and when the hook 8 tries to hook it, the felt slips and cannot be effectively hooked. After being compacted, the hook 8 and the felt have a stable force point, preventing the felt from slipping and thus hooking it out, ensuring the stability of the crushing volume per unit time. The compaction of the felt should be appropriate, avoiding excessive compaction that increases the insertion resistance of the tip of the insertion column 7 and the hook 8, while also avoiding insufficient compaction that makes it difficult to hook the felt out effectively. Specifically, the compaction effect of the felt can be determined through multiple experiments. A pressure sensor that monitors the extrusion pressure is set between the extrusion drive mechanism 4 and the extrusion block 3. By applying different pressures, the felt has different compaction levels. Then, at each compaction level, the hook 8 is used to hook the felt multiple times to select the pressure corresponding to the best hooking effect. The pressure of the extrusion drive mechanism 4 on the extrusion block 3 is kept constant. As the hook 8 continuously carries the felt out, the volume of the felt in the extrusion chamber 1 decreases, and the extrusion block 3 automatically descends to compensate, ensuring that the felt is always in a suitable hooking state during the crushing process.

[0021] In this invention, the separation mechanism includes a fixed plate 17 fixedly disposed between the movable plate 6 and the through hole 5. The upper end of the fixed plate 17 is connected to the top wall of the crushing chamber 10, the two sides are connected to the side walls of the crushing chamber 10, and the lower end is suspended. An insertion post 7 penetrates the side wall of the fixed plate 17 and slides in cooperation with the fixed plate 17. Each insertion post 7 has multiple axially extending grooves on its outer wall, located between two adjacent hooks 8. Each groove contains a slice 18 that slides in cooperation with the groove, and one end of the slice 18 is fixedly disposed on the side wall of the fixed plate 17. The position of the slice 18 remains fixed, but when the insertion post 7 moves axially, the slice 18 slides relative to the insertion post 7. In the initial position, the front end of the slice 18 extends beyond the tip of the insertion post 7, that is, the distance from the front end of the slice 18 to the fixed plate 17 is greater than the distance from the tip of the insertion post 7 to the fixed plate 17, to ensure that the felt is fully cut. The front end of the slice 18 is provided with a cutting edge. When the insert column 7 carries the felt from the extrusion chamber 1 into the descraping chamber 11, the cutting edge of the slice 18 will contact the felt attached to the insert column 7. With the help of the power of the insert column 7 moving, the cutting edge of the slice 18 cuts the felt. The cut is located between two adjacent hooks 8. The hooks 8 will not hinder the relative sliding of the slice 18.

[0022] To ensure the stable movement of the movable plate 6, multiple guide posts perpendicular to the fixed plate 17 can be installed on the fixed plate 17. The guide posts pass through the movable plate 6 and slide in cooperation with it. The guide posts can support the movable plate 6 and guide and position it, ensuring its stability.

[0023] To further detach the cut felt from the insertion post 7, an air chamber 19 is provided inside the movable plate 6. The air chamber 19 is connected to an air supply mechanism 20, which can be an air pump or other equipment, located outside the crushing chamber 10 and connected to the air chamber 19 via a hose. Each insertion post 7 has an air passage 21 inside, and the side wall of the insertion post 7 inside the hook 8 has an air jet hole 22. The air jet direction of the air jet hole 22 is consistent with the radial direction of the insertion post 7. One end of the air passage 21 is connected to the air chamber 19, and the other end is connected to the air jet hole 22. When the hook 8 pierces the felt and moves towards the descrambling chamber 11, the hooked felt is located inside the hook 8, at which point the felt covers the air jet hole 22. After the hook 8 resets, the air supply mechanism 20 pressurizes the air and delivers it to the air chamber 19. The air in the air chamber 19 then enters each air passage 21 and moves through the air passage 21 to the air jet hole 22. When it is ejected from the air jet hole 22, it can blow away the felt located inside the hook 8 and on the outer wall of the insertion post 7. Meanwhile, the airflow passing through the hook 8 can also cool the hook 8, preventing it from overheating due to prolonged friction. The air jet 22 sprays air intermittently, meaning that air is only blown when the hook 8 drives the felt into the stripping chamber 11; no air is blown when the hook 8 enters the extrusion chamber 1.

[0024] The hook 8 is a right triangle, with one right-angled side fixedly connected to the insertion post 7, and the other right-angled side perpendicular to the insertion post 7, which helps the felt to detach quickly.

[0025] The blown-off felt can fall to the bottom of the descrambling chamber 11 under its own weight, or a discharge port can be set on the side wall of the descrambling chamber 11, and the blown-off felt can be transported to the discharge port by wind. However, since there are a lot of insertion columns 7 in the descrambling chamber 11, these insertion columns 7 form a dense obstacle matrix during the discharge of the felt, which hinders the horizontal flow of the felt and easily causes the felt to accumulate and block between the insertion columns 7, making it difficult for the felt separated from each insertion column 7 to be effectively discharged.

[0026] To facilitate more orderly discharge of the felt and reduce the obstruction effect of the insert posts 7, the insert posts 7 and through holes 5 are arranged in a rectangular array, i.e., in multiple rows and columns. A vertical partition 12 is provided between adjacent vertical rows of insert posts 7, with an appropriate discharge spacing between the partition 12 and the insert posts 7. The upper end of the partition 12 is connected to the top wall of the discharge chamber 11, and the two sides of the partition 12 are connected to the fixed plate 17 and the outer wall of the extrusion chamber 1, respectively. The discharge mechanism includes a discharge channel 13, which is located below the partition 12 and extends to the outside of the crushing chamber 10. The partition 12 divides the discharge chamber 11 into multiple independent discharge sections, each of which is only connected to the discharge channel 13 at its lower end, with the rest relatively sealed. After high-pressure air is ejected from the jet hole 22, it further increases the air pressure in each stripping section. This results in airflow flowing outwards from the insertion column 7, effectively blowing away the felt. In the stripping section as a whole, the airflow flows downwards into the discharge channel 13, carrying the blown-away felt into the discharge channel 13. The felt in the discharge channel 13 is discharged with the airflow and then collected by a collection mechanism, such as a cloth bag. Because the sidewall of the partition 12 is smooth and does not obstruct the downward movement of the felt, and because there is only one row of insertion columns 7 in each stripping section, the obstruction to the felt is minimal, thus ensuring effective discharge.

[0027] As can be seen, in this invention, the fixing plate 17 not only serves to install the cutting slice 18, but also, together with the partition plate 12, forms a stripping section with only the lower end open. The partition plate 12 also guides airflow and reduces obstructions, forcibly guiding the high-pressure airflow from disordered turbulence to an ordered airflow of "partial separation - overall downward flow," with the airflow direction shown by the arrow in the diagram. This solves the felt clogging problem and achieves efficient and orderly felt discharge.

[0028] Inevitably, felt scraps contain impurities such as plastic particles, sand, and metal shavings. To separate these impurities, an inclined screen 14 is installed in the discharge channel 13, and an inclined impurity discharge trough 15 is installed below the screen 14. Impurities are usually denser and fall onto the screen 14 by gravity. They then pass through the mesh of the screen 14 into the impurity discharge trough 15 below, and then slide automatically downwards along the impurity discharge trough 15, thereby being discharged from the crushing chamber 10.

[0029] Some felt may also fall onto the screen 14, affecting the removal of impurities. In this invention, the screen 14 is provided with a frame, which is located inside the impurity discharge groove 15 and slides in the vertical direction with the impurity discharge groove 15. A spring 16 is provided on the lower surface of the frame, and a driven block 23 is provided on the upper surface of the frame. The upper surface of the driven block 23 is inclined downward or upward along the movement direction of the movable plate 6. A driving member 24 is fixedly provided at the lower end of the movable plate 6, and the bottom of the driving member 24 is in contact with the upper surface of the driven block 23.

[0030] When the movable plate 6 moves linearly, it drives the driving component 24 to move synchronously. Since the upper surface of the driven block 23 is inclined, it drives the driven block 23 to move up and down, thereby causing the frame to vibrate continuously up and down. Under the action of vibration, the felt on the screen 14 can move downward along the screen 14 and eventually be discharged. At the same time, it promotes the falling of impurities on the surface of the screen 14 into the impurity discharge groove 15, relieving blockage. The driving component 24 can be a driving block with an inclined bottom surface, and the bottom surface of the driving block is attached to the upper surface of the driven block 23. Preferably, the driving component 24 is a roller that can roll along the upper surface of the movable plate 6 to reduce friction.

[0031] The vibration of the screen 14 is driven by the movement of the movable plate 6, which eliminates the need for additional power equipment and helps reduce equipment costs and energy consumption.

[0032] Some impurities, due to their small size and high density, will gradually settle to the bottom of the crushing chamber 10. In order to remove these impurities in a timely manner, a removable impurity collection trough 25 is provided on the bottom wall of the crushing chamber 10. The impurity collection trough 25 can be removed periodically to clean the impurities deposited in it.

[0033] In this invention, all moving parts move linearly, with no rotating parts, thus structurally eliminating the possibility of fiber entanglement. No downtime for cleaning is required, meeting the needs of continuous production and reducing manual maintenance costs. In this invention, the fiber bundles hooked by the claw 8 only adhere to the outer wall of the insertion post 7, without forming a tightly wrapped structure. Unlike the tightly wrapped layer formed on the rotating spindle in existing technologies, the separation mechanism can effectively remove the fiber bundles from the insertion post.

[0034] This invention features multiple through holes 5 on the side wall of the extrusion chamber 1. After the hook 8 picks up the felt fibers, they pass through the through holes 5 back to the descrambling chamber 11. During this process, the diameter of the through holes 5 restricts the volume of the felt: smaller felt fibers can pass smoothly through the through holes 5 and enter the descrambling chamber 11, while larger felt fibers are blocked by the edges of the through holes 5, are torn, and break into smaller pieces. Therefore, in each cycle, the volume of the fiber bundle carried out by the hook 8 is strictly constrained by the diameter of the through holes 5, preventing the generation of large pieces of material. This ensures that uniformly sized loose fiber bundles can be obtained in a single process, eliminating the need for screening and secondary processing.

[0035] Furthermore, it is well known that high-speed bearings in rotating components require continuous lubrication and cooling, while the spindle seal is highly susceptible to wear in a felt fiber environment, leading to lubricant leakage. In contrast, the guide structure of linear motion components can use self-lubricating materials or low-speed sliding bearings, significantly reducing reliance on lubrication and making them more suitable for dusty environments.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A felt crushing device, comprising a crushing chamber (10), characterized in that: The crushing chamber (10) is provided with a compression chamber (1) and a discharge chamber (11). The upper side wall of the compression chamber (1) is provided with a feed inlet (2) extending to the outside of the crushing chamber (10). The top of the inner cavity of the compression chamber (1) is provided with a compression block (3) that slides in the vertical direction with the compression chamber (1). The compression block (3) is connected to a compression drive mechanism (4). The lower part of the side wall of the extrusion chamber (1) facing the descraping chamber (11) is provided with a plurality of through holes (5) arranged in an array. Each through hole (5) is provided with an insertion post (7). One end of the insertion post (7) is fixedly connected to a movable plate (6), and the other end is a tip. The outer wall of the tip is provided with a plurality of hooks (8). The plurality of hooks (8) are arranged in an umbrella shape, and the umbrella tip faces the tip of the insertion post (7). The movable plate (6) is connected to a crushing drive mechanism (9). The crushing drive mechanism (9) is used to drive the movable plate (6) to move back and forth in a straight line, so that the insertion post (7) and the hooks (8) move back and forth in and out of the extrusion chamber (1). The unloading chamber (11) is provided with a separation mechanism for separating the felt from the insertion column (7); the separation mechanism includes a fixed plate (17) fixedly disposed between the movable plate (6) and the through hole (5), the insertion column (7) penetrates the side wall of the fixed plate (17) and slides with the fixed plate (17), the outer wall of each insertion column (7) is provided with multiple axially extending grooves to the tip, the grooves are located between two adjacent hooks (8), each groove is provided with a slice (18) that slides with the groove, one end of the slice (18) is fixedly disposed on the side wall of the fixed plate (17); the unloading chamber (11) is connected to a discharge mechanism for discharging the felt to the outside of the crushing chamber (10).

2. The felt crushing device as described in claim 1, characterized in that: The movable plate (6) is provided with an air chamber (19), and the air chamber (19) is connected to an air supply mechanism (20); each insertion post (7) is provided with an air passage (21), and the side wall of the insertion post (7) inside the hook (8) is provided with a jet hole (22). One end of the air passage (21) is connected to the air chamber (19), and the other end is connected to the jet hole (22).

3. The felt crushing device as described in claim 2, characterized in that: The hook (8) is a right triangle, with one right-angled side fixedly connected to the insertion post (7) and the other right-angled side perpendicular to the insertion post (7).

4. The felt crushing device as described in claim 2, characterized in that: The insertion columns (7) and through holes (5) are arranged in a rectangular array. A vertical partition (12) is provided between two adjacent vertical rows of insertion columns (7). The upper end of the partition (12) is connected to the top wall of the discharge chamber (11). The two sides of the partition (12) are connected to the fixed plate (17) and the outer wall of the extrusion chamber (1), respectively. The discharge mechanism includes a discharge channel (13), which is located below the partition (12) and extends to the outside of the crushing chamber (10).

5. The felt crushing device as described in claim 4, characterized in that: An inclined screen (14) is installed in the discharge channel (13), and an inclined impurity discharge trough (15) is installed below the screen (14).

6. The felt crushing device as described in claim 5, characterized in that: The screen (14) has a frame at its edge. The frame is located inside the impurity discharge groove (15) and slides in the vertical direction with the impurity discharge groove (15). A spring (16) is provided on the lower surface of the frame. A driven block (23) is provided on the upper surface of the frame. The upper surface of the driven block (23) is inclined downward or upward along the movement direction of the movable plate (6). A driving member (24) is provided at the lower end of the movable plate (6). The bottom of the driving member (24) is in contact with the upper surface of the driven block (23).

7. The felt crushing device as described in claim 1, characterized in that: The bottom wall of the crushing chamber (10) is provided with a removable impurity collection trough (25).

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