A dewatering device for a coal washing machine

Abstract

This invention provides a dewatering device for a coal washing machine, including a dewatering assembly. The dewatering assembly includes an operating frame, an annular fixed plate, several springs, a conical operating box, a vibrating air intake mechanism, a spiral plate, a cylindrical body, and a drain pipe. The invention uses the vibrating air intake mechanism to drive the annular fixed plate to vibrate, while simultaneously injecting air into the spiral exhaust chamber on the spiral plate. The annular fixed plate, through the springs, assists the conical operating box, which acts like a vibrating screen. The conical operating box causes the coal blocks on the spiral plate to float slightly, thus causing the coal blocks to vibrate and slide on the spiral plate. Water in the coal blocks is filtered through the liquid inlet filter hole into the spiral water guide chamber. Subsequently, the gas in the spiral exhaust chamber is transmitted to the coal blocks on the spiral plate through the exhaust hole. This process not only dries the coal blocks but also assists in guiding water into the liquid inlet filter hole, improving the drying efficiency and effect of the coal blocks.

Description

Technical Field

[0001] This invention relates to the technical field of auxiliary devices for coal dewatering equipment, and particularly to a dewatering device for a coal washing machine. Background Technology

[0002] First, the coal slurry water is pre-concentrated to reduce the water volume and increase the coal slurry content. Then, a flocculant is added to the coal slurry water to cause the fine coal powder and mineral particles to agglomerate into larger flocs, which facilitates subsequent separation. Then, a coal washing machine (such as a vacuum filter, filter press, centrifuge, etc.) is used to separate the solid and liquid components, separating the coal slurry from the water. The separated wet coal slurry is then dried to obtain marketable finished coal.

[0003] For example, application publication number CN217737833U discloses a dewatering device for a coal washing machine. The dewatering machine has a first screen plate and a second screen plate installed inside, and both the first screen plate and the second screen plate are fixedly connected to the dewatering machine by fastening screws. The first screen plate and the second screen plate are arranged alternately. A feed hopper is installed above the dewatering machine and is fixedly connected to the dewatering machine by fastening screws. A drain hopper is installed below the dewatering machine and is an integral structure with the dewatering machine. The surfaces of the first screen plate and the second screen plate are provided with water permeable holes. A vibration spring is installed above the support base. The support base and the connecting legs are fixedly connected to the vibration spring by fastening screws. An outer protective shell is installed on one side of the dewatering machine and is fixedly connected to the dewatering machine by fastening screws.

[0004] The advantages of the above application are as follows: by setting up the first screen plate and the second screen plate, water permeable holes are provided on the surface of the first screen plate and the second screen plate are staggered and the two screen plates have the same structure. The coal block moves above the two screen plates, and water is filtered through the water permeable holes, thereby separating the coal block from the water and realizing the dehydration work. The coal block slides alternately between multiple first screen plates and second screen plates, and dehydration can be achieved under the action of gravity alone, without the need for centrifugation, thereby achieving more efficient dehydration and improving dehydration efficiency. Furthermore, through the setting of the vibration spring, the dewatering machine is connected to the support base via the connecting legs and the vibration spring. When the dewatering machine is used to dewater coal blocks, it can vibrate continuously under the drive of the motor and the vibration spring, just like a vibrating screen. This allows the coal blocks to float slightly, exposing the moisture between the coal blocks and thus improving the dewatering effect. However, if the dewatering effect is poor and the surface of the coal blocks cannot be dried, the water will slide on the screen plate. Due to the excessive water flow speed, the residual water will move with the coal blocks. Moreover, when filtering water from the coal blocks, the filtered water will repeatedly flow to the coal blocks on the lower filter screen, resulting in a decrease in dewatering efficiency. Therefore, a dewatering device for a coal washing machine is proposed. Summary of the Invention

[0005] In view of this, the present invention aims to provide a dewatering device for a coal washing machine to solve or alleviate the technical problems existing in the prior art, and at least provide a beneficial alternative.

[0006] The technical solution of this invention is implemented as follows: A dewatering device for a coal washing machine includes a dewatering assembly. The dewatering assembly includes an operating frame, an annular fixing plate, several springs, a conical operating box, a vibration air intake mechanism, a spiral plate, a circular cylinder, and a drain pipe. The upper surface of the operating frame has a circular operating through hole, and the conical operating box passes through the circular operating through hole. The annular fixing plate is disposed on the outer wall of the conical operating box, and the top ends of several springs are evenly disposed on the lower surface of the annular fixing plate, while the bottom ends of several springs are evenly disposed on the upper surface of the operating frame. The spiral plate is disposed on the conical operating box. The inner wall of the box, and the circular cylinder is disposed on the inner wall of the spiral plate; the inner wall of the spiral plate is respectively provided with a spiral water guiding cavity and a spiral exhaust cavity, and the spiral water guiding cavity is disposed above the spiral exhaust cavity; the inner top wall of the spiral water guiding cavity is uniformly provided with liquid inlet filter holes, and the inner bottom wall of the spiral exhaust cavity is uniformly provided with exhaust holes; the vibration air intake mechanism is disposed on the annular fixed plate, the conical operating box and the spiral plate; the drain pipe passes through the conical operating box and the spiral plate in sequence, and the drain pipe is fixedly connected to the conical operating box and the spiral plate, and the drain pipe is connected to the spiral water guiding cavity.

[0007] Optionally, the vibration intake mechanism includes a servo motor, a movable cylinder, a crescent-shaped eccentric block, an incomplete gear, two racks, several fixed rods, a piston, a first one-way valve, and a second one-way valve. The lower surface of the servo motor is provided with a mounting plate, which is disposed on the outer wall of the annular fixed plate. One side of the crescent-shaped eccentric block is disposed on the output shaft of the servo motor. One side of the movable cylinder is slidably connected to the outer wall of the conical operating box, and the other side of the movable cylinder has a movable groove. The two racks are symmetrically disposed on the inner wall of the movable groove, and the outer wall of the incomplete gear intermittently meshes with the adjacent side of the two racks. The incomplete gear is disposed on the other side of the crescent-shaped eccentric block. The bottom ends of several fixed rods are evenly disposed on the upper surface of the annular fixed plate. The top ends of several fixed rods are evenly distributed on the lower surface of the piston, and the outer wall of the piston is attached to the inner wall of the movable cylinder. An air inlet pipe and a first exhaust pipe are respectively passed through the upper surface of the movable cylinder, and both the air inlet pipe and the first exhaust pipe are connected to the interior of the movable cylinder. The air inlet pipe and the first exhaust pipe are fixedly connected to the movable cylinder, and a first one-way valve is disposed on the outer wall of the air inlet pipe. A corrugated pipe is disposed at the top end of the first exhaust pipe, and a second exhaust pipe is disposed at the top end of the corrugated pipe. A second one-way valve is disposed on the outer wall of the second exhaust pipe. One end of the second exhaust pipe passes through the conical operating box and the spiral plate in sequence, and the second exhaust pipe is fixedly connected to both the conical operating box and the spiral plate. The second exhaust pipe is connected to the exhaust port.

[0008] Optionally, the upper surface of the spiral plate is uniformly provided with shielding strips.

[0009] Optionally, a rubber sealing ring is fitted onto the outer wall of the piston, and the outer wall of the rubber sealing ring is attached to the inner wall of the movable cylinder.

[0010] Optionally, the outer wall of the conical operating box is uniformly provided with sliding grooves, and a slider is uniformly provided on one side of the movable cylinder, with the outer wall of the slider slidably connected to the inner wall of the sliding groove.

[0011] Optionally, a feed funnel is provided on the upper surface of the conical operating box.

[0012] Optionally, a conical dispersion block is provided at the top of the cylindrical body.

[0013] Optionally, the front surface of the operating frame is provided with a control panel, which is electrically connected to the servo motor via wires.

[0014] The embodiments of the present invention have the following advantages due to the adoption of the above technical solutions:

[0015] I. This invention uses a vibrating air intake mechanism to drive the annular fixed plate to vibrate. Simultaneously, the vibrating air intake mechanism injects air into the spiral exhaust chamber on the spiral plate. The annular fixed plate, through a spring, assists the conical operating box, which acts like a vibrating screen. The conical operating box causes the coal block on the spiral plate to float slightly, thereby causing the coal block to vibrate and slide on the spiral plate. Water in the coal block is filtered through the liquid inlet filter hole into the spiral water guide chamber. Subsequently, the gas in the spiral exhaust chamber is transmitted to the coal block on the spiral plate through the exhaust hole. This process not only dries the coal block but also assists in guiding water into the liquid inlet filter hole, improving the drying efficiency and effect of the coal block.

[0016] II. This invention uses the output shaft of a servo motor to drive a crescent-shaped eccentric block to rotate. Simultaneously, the crescent-shaped eccentric block drives the incomplete gear to rotate, which in turn causes the servo motor and the annular fixed plate to vibrate. The incomplete gear intermittently meshes on two racks, thereby driving the movable cylinder to move up and down on the conical operating box. When the movable cylinder moves upward, the intake pipe draws external gas into the movable cylinder. When the movable cylinder moves downward, the gas inside the movable cylinder is transmitted to the spiral exhaust chamber through the first exhaust pipe, the bellows pipe, and the second exhaust pipe. The second one-way valve and the first one-way valve control the air intake direction of the second exhaust pipe and the intake pipe, ensuring the vibration direction of the coal block inside the conical operating box while guaranteeing the gas transmitted for drying the coal block, reducing operating costs, and improving the drying efficiency and effect of the coal block.

[0017] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural diagram of the present invention;

[0020] Figure 2 This is a side view of the structure of the present invention;

[0021] Figure 3 For the present invention Figure 2 AA side section structural diagram;

[0022] Figure 4For the present invention Figure 3 Enlarged structural diagram of region B;

[0023] Figure 5 For the present invention Figure 3 Enlarged structural diagram of region C;

[0024] Figure 6 For the present invention Figure 3 Enlarged structural diagram of region D;

[0025] Figure 7 For the present invention Figure 3 Enlarged structural diagram of region E;

[0026] Figure 8 This is a structural diagram of the vibration intake mechanism of the present invention;

[0027] Figure 9 This is a structural diagram showing the connection between the spiral plate and the shielding strip of the present invention.

[0028] Reference numerals: 1. Dewatering assembly; 2. Feed funnel; 3. Control panel; 4. Mounting plate; 5. Circular operating through-hole; 6. Movable groove; 7. Air inlet pipe; 8. First exhaust pipe; 9. Corrugated pipe; 10. Operating frame; 11. Annular fixing plate; 12. Spring; 13. Conical operating box; 14. Vibrating air inlet mechanism; 15. Spiral plate; 16. Circular cylinder; 17. Drain pipe; 20. Slide groove; 21. Sliding block; 22. 23. Rubber sealing ring; 24. Shielding strip; 25. Second exhaust pipe; 26. Spiral water guiding chamber; 27. Spiral exhaust chamber; 28. Exhaust hole; 29. ​​Liquid inlet filter hole; 10. Conical dispersion block; 11. Servo motor; 12. Movable cylinder; 13. Crescent-shaped eccentric block; 144. Incomplete gear; 15. Rack; 16. Fixed rod; 17. Piston; 18. First check valve; 19. Second check valve. Detailed Implementation

[0029] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0030] It is important to note that terms such as "first," "second," "symmetric," "array," "set in," and "set with" are used only to distinguish between descriptive and positional descriptions and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified with terms such as "first" or "symmetric" may explicitly or implicitly include one or more of that feature; similarly, when the quantity of certain features is not limited by words such as "two" or "three," it should be noted that such features also explicitly or implicitly include one or more features.

[0031] In this invention, unless otherwise explicitly specified and limited, terms such as "installation," "connection," and "fixation" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection, a direct connection, a welding connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the accompanying drawings and specific circumstances.

[0032] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0033] like Figures 1-9 As shown, this embodiment of the invention provides a dewatering device for a coal washing machine, including a dewatering component 1. The dewatering component 1 includes an operating frame 10, an annular fixing plate 11, several springs 12, a conical operating box 13, a vibration air intake mechanism 14, a spiral plate 15, a circular cylinder 16, and a drain pipe 17. The operating frame 10 has a circular operating through hole 5 on its upper surface, through which the conical operating box 13 passes. The annular fixing plate 11 is disposed on the outer wall of the conical operating box 13. The top ends of several springs 12 are evenly disposed on the lower surface of the annular fixing plate 11, and the bottom ends of several springs 12 are evenly disposed on the upper surface of the operating frame 10. The spiral plate 15 is disposed in the conical operating box. The inner wall of the spiral plate 15 is provided with a circular cylinder 16. The inner wall of the spiral plate 15 is provided with a spiral water guiding cavity 25 and a spiral exhaust cavity 26. The spiral water guiding cavity 25 is located above the spiral exhaust cavity 26. The inner top wall of the spiral water guiding cavity 25 is provided with liquid inlet filter holes 28. The inner bottom wall of the spiral exhaust cavity 26 is provided with exhaust holes 27. The vibration air intake mechanism 14 is provided on the annular fixed plate 11, the conical operating box 13 and the spiral plate 15. The drain pipe 17 passes through the conical operating box 13 and the spiral plate 15 in sequence. The drain pipe 17 is fixedly connected to the conical operating box 13 and the spiral plate 15. The drain pipe 17 is connected to the spiral water guiding cavity 25.

[0034] In this embodiment, specifically, the vibration air intake mechanism 14 includes a servo motor 140, a movable cylinder 141, a crescent-shaped eccentric block 142, an incomplete gear 143, two racks 144, several fixed rods 145, a piston 146, a first one-way valve 147, and a second one-way valve 148. The lower surface of the servo motor 140 is provided with a mounting plate 4, which is disposed on the outer wall of the annular fixed plate 11. One side of the crescent-shaped eccentric block 142 is disposed on the output shaft of the servo motor 140. One side of the movable cylinder 141 is slidably connected to the outer wall of the conical operating box 13, and the other side of the movable cylinder 141 has a movable groove 6. The two racks... 144 are symmetrically arranged on the inner wall of the movable groove 6, and the outer wall of the incomplete gear 143 intermittently meshes with the adjacent side of the two racks 144. The incomplete gear 143 is arranged on the other side of the crescent-shaped eccentric block 142. The bottom ends of several fixing rods 145 are evenly arranged on the upper surface of the annular fixing plate 11, and the top ends of several fixing rods 145 are evenly arranged on the lower surface of the piston 146. The outer wall of the piston 146 is attached to the inner wall of the movable cylinder 141. The upper surface of the movable cylinder 141 is respectively penetrated by an intake pipe 7 and a first exhaust pipe 8, and both the intake pipe 7 and the first exhaust pipe 8 are connected to the interior of the movable cylinder 141. The exhaust pipe 8 is fixedly connected to the movable cylinder 141. A first one-way valve 147 is located on the outer wall of the intake pipe 7. A bellows 9 is located at the top of the first exhaust pipe 8, and a second exhaust pipe 24 is located at the top of the bellows 9. A second one-way valve 148 is located on the outer wall of the second exhaust pipe 24. One end of the second exhaust pipe 24 passes through the conical operating box 13 and the spiral plate 15 in sequence, and the second exhaust pipe 24 is fixedly connected to both the conical operating box 13 and the spiral plate 15. The second exhaust pipe 24 is connected to the exhaust port 27. The output shaft of the servo motor 140, as described above, drives the crescent-shaped eccentric block 142 to rotate. The crescent-shaped eccentric block 142 drives the incomplete gear. As 143 rotates, the crescent-shaped eccentric block 142 drives the servo motor 140 and the annular fixed plate 11 to vibrate. The annular fixed plate 11, through the spring 12, assists the conical operating box 13 to function like a vibrating screen. The incomplete gear 143 intermittently meshes on the two racks 144, thereby driving the movable cylinder 141 to move up and down on the conical operating box 13. When the movable cylinder 141 moves upward, the air intake pipe 7 draws external gas into the movable cylinder 141. When the movable cylinder 141 moves downward, the gas in the movable cylinder 141 is transmitted to the spiral exhaust chamber 26 through the first exhaust pipe 8, the bellows pipe 9, and the second exhaust pipe 24.

[0035] In this embodiment, specifically, the upper surface of the spiral plate 15 is uniformly provided with shielding strips 23. The shielding strips 23 are used to block water and coal blocks and to assist water in moving into the liquid inlet filter hole 28.

[0036] In this embodiment, specifically, a rubber sealing ring 22 is embedded in the outer wall of the piston 146, and the outer wall of the rubber sealing ring 22 is attached to the inner wall of the movable cylinder 141. The rubber sealing ring 22 is provided to enhance the airtightness between the piston 146 and the movable cylinder 141.

[0037] In this embodiment, specifically, the outer wall of the conical operating box 13 is uniformly provided with sliding grooves 20, and a slider 21 is uniformly provided on one side of the movable cylinder 141. The outer wall of the slider 21 is slidably connected to the inner wall of the sliding groove 20. By the above arrangement, the slider 21 can be moved in the sliding groove 20, which can both assist the movable cylinder 141 to move and stabilize the position of the movable cylinder 141.

[0038] In this embodiment, specifically, a feeding funnel 2 is provided on the upper surface of the conical operating box 13. The feeding funnel 2 is used to control the amount of coal blocks fed in.

[0039] In this embodiment, specifically, a conical dispersion block 29 is provided at the top of the circular cylinder 16. The conical dispersion block 29 is used to disperse the coal blocks onto the spiral plate 15 to prevent the coal blocks from accumulating.

[0040] In this embodiment, specifically, the front surface of the operating frame 10 is provided with a control panel 3, and the control panel 3 is electrically connected to the servo motor 140 via wires.

[0041] In operation, the present invention works as follows: Personnel control the servo motor 140 via the control panel 3. The output shaft of the servo motor 140 drives the crescent-shaped eccentric block 142 to rotate. Simultaneously, the crescent-shaped eccentric block 142 drives the incomplete gear 143 to rotate, causing the servo motor 140 and the annular fixed plate 11 to vibrate. The annular fixed plate 11, via spring 12, assists the conical operating box 13, which functions like a vibrating screen. The incomplete gear 143 intermittently meshes with two racks 144, thereby driving the movable cylinder 141 to move up and down on the conical operating box 13. When the movable cylinder 141 moves upward, the air intake pipe 7 draws external gas into the movable cylinder 141. When the movable cylinder 141 moves downward, the piston 146 compresses the gas inside the movable cylinder 141. The gas inside the movable cylinder 141 is transmitted to the spiral exhaust chamber 26 through the first exhaust pipe 8, the bellows 9, and the second exhaust pipe 24. The second one-way valve 148 is used to control the second exhaust pipe 24 to discharge the gas inside the movable cylinder 141, but external gas cannot be transmitted to the movable cylinder 141 through the second exhaust pipe 24, the bellows 9, and the first exhaust pipe 8. The first one-way valve 147 is used to control the gas in the intake pipe 7 to enter the movable cylinder 141, allowing external gas to be transmitted to the movable cylinder 141 through the intake pipe 7, but the gas inside the movable cylinder 141 cannot be discharged through the intake pipe 7.

[0042] Afterwards, relevant personnel put coal blocks into the feed hopper 2, controlling the amount of coal blocks fed into the feed hopper 2. The coal blocks fall onto the conical dispersion block 29, which disperses the coal blocks onto the spiral plate 15. The shielding strip 23 is used to block water and coal blocks. The conical operating box 13 causes the coal blocks on the spiral plate 15 to float slightly, causing the coal blocks to vibrate and slide on the spiral plate 15. The water in the coal blocks is filtered through the liquid inlet filter hole 28 into the spiral water guiding chamber 25. At the same time, the gas in the spiral exhaust chamber 26 is transmitted to the coal blocks on the spiral plate 15 through the exhaust hole 27. This process can both dry the coal blocks and assist water in entering the liquid inlet filter hole 28. The water in the liquid inlet filter hole 28 is transmitted to the spiral water guiding chamber 25. The water in the spiral water guiding chamber 25 is discharged through the drain pipe 17. The dehydrated coal blocks are discharged through the spiral plate 15 and the conical operating box 13, improving work efficiency.

[0043] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in the present invention, and these should all be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A dewatering device for a coal washing machine, comprising a dewatering component (1), characterized in that: The dehydration assembly (1) includes an operating frame (10), an annular fixing plate (11), several springs (12), a conical operating box (13), a vibration air intake mechanism (14), a spiral plate (15), a circular cylinder (16), and a drain pipe (17), wherein, The upper surface of the operating frame (10) is provided with a circular operating through hole (5), and the conical operating box (13) passes through the circular operating through hole (5). The annular fixing plate (11) is disposed on the outer wall of the conical operating box (13), and the top ends of a plurality of springs (12) are evenly disposed on the lower surface of the annular fixing plate (11), and the bottom ends of a plurality of springs (12) are evenly disposed on the upper surface of the operating frame (10). The spiral plate (15) is disposed on the inner wall of the conical operating box (13), and the circular cylinder (16) is disposed on the inner wall of the spiral plate (15); The inner wall of the spiral plate (15) is provided with a spiral water guiding cavity (25) and a spiral exhaust cavity (26), and the spiral water guiding cavity (25) is located above the spiral exhaust cavity (26); The inner top wall of the spiral water guiding cavity (25) is uniformly provided with liquid inlet filter holes (28), and the inner bottom wall of the spiral exhaust cavity (26) is uniformly provided with exhaust holes (27). The vibration air intake mechanism (14) is provided on the annular fixed plate (11), the conical operating box (13) and the spiral plate (15); The drain pipe (17) passes through the conical operating box (13) and the spiral plate (15) in sequence, and the drain pipe (17) is fixedly connected to the conical operating box (13) and the spiral plate (15). The drain pipe (17) is connected to the spiral water guiding cavity (25).

2. The dewatering device for a coal washing machine according to claim 1, characterized in that: The vibration intake mechanism (14) includes a servo motor (140), a movable cylinder (141), a crescent-shaped eccentric block (142), an incomplete gear (143), two racks (144), several fixed rods (145), a piston (146), a first check valve (147), and a second check valve (148), wherein, The lower surface of the servo motor (140) is provided with a mounting plate (4), the mounting plate (4) is provided on the outer wall of the annular fixing plate (11), and one side of the crescent-shaped eccentric block (142) is provided on the output shaft of the servo motor (140); One side of the movable cylinder (141) is slidably connected to the outer wall of the conical operating box (13), and the other side of the movable cylinder (141) is provided with a movable groove (6). The two racks (144) are symmetrically arranged on the inner wall of the movable groove (6), and the outer wall of the incomplete gear (143) intermittently meshes with the adjacent side of the two racks (144). The incomplete gear (143) is arranged on the other side of the crescent-shaped eccentric block (142). The bottom ends of several fixing rods (145) are evenly arranged on the upper surface of the annular fixing plate (11), and the top ends of several fixing rods (145) are evenly arranged on the lower surface of the piston (146). The outer wall of the piston (146) is attached to the inner wall of the movable cylinder (141). The upper surface of the movable cylinder (141) is respectively penetrated by an air inlet pipe (7) and a first exhaust pipe (8), and the air inlet pipe (7) and the first exhaust pipe (8) are both connected to the interior of the movable cylinder (141). The air inlet pipe (7) and the first exhaust pipe (8) are fixedly connected to the movable cylinder (141), and the first one-way valve (147) is disposed on the outer wall of the air inlet pipe (7). The first exhaust pipe (8) is provided with a bellows (9) at its top end, and the bellows (9) is provided with a second exhaust pipe (24) at its top end. The second one-way valve (148) is provided on the outer wall of the second exhaust pipe (24). One end of the second exhaust pipe (24) passes through the conical operating box (13) and the spiral plate (15) in sequence, and the second exhaust pipe (24) is fixedly connected to the conical operating box (13) and the spiral plate (15). The second exhaust pipe (24) is connected to the exhaust hole (27).

3. The dewatering device for a coal washing machine according to claim 1, characterized in that: The upper surface of the spiral plate (15) is uniformly provided with shielding strips (23).

4. The dewatering device for a coal washing machine according to claim 2, characterized in that: The outer wall of the piston (146) is fitted with a rubber sealing ring (22), and the outer wall of the rubber sealing ring (22) is attached to the inner wall of the movable cylinder (141).

5. The dewatering device for a coal washing machine according to claim 2, characterized in that: The outer wall of the conical operating box (13) is uniformly provided with sliding grooves (20), and a slider (21) is uniformly provided on one side of the movable cylinder (141). The outer wall of the slider (21) is slidably connected to the inner wall of the sliding groove (20).

6. The dewatering device for a coal washing machine according to claim 1, characterized in that: The upper surface of the conical operating box (13) is provided with a feeding funnel (2).

7. The dewatering device for a coal washing machine according to claim 1, characterized in that: The top of the circular cylinder (16) is provided with a conical dispersion block (29).

8. The dewatering device for a coal washing machine according to claim 2, characterized in that: The front surface of the operating frame (10) is provided with a control panel (3), and the control panel (3) is electrically connected to the servo motor (140) via wires.

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