Diaphragm squeezing type coal slime deep dehydration device

Abstract

The utility model discloses a diaphragm squeezing type coal slime deep dehydration device. The diaphragm squeezing type coal slime deep dehydration device comprises a filter pressing bin body, a squeezing assembly, a driving mechanism and a sealing regulation and control unit, the squeezing assembly increases the contact area and forms a local high-pressure area through the design of the protruding blocks at the bottom of the elastic diaphragm, and the dewatering efficiency is improved. The sealing regulation and control unit adopts a sealing ring to be matched with a pressing ring and an elastic gasket to compensate deformation, so that the sealing performance is enhanced; the driving mechanism achieves efficient squeezing action through combination of a hydraulic cylinder and a transmission connecting rod, and stability is guaranteed through a pressure sensor. In addition, the design of the guide plate and the liquid outlet reduces coal slime residues and improves liquid discharging efficiency. The problems that an existing device is uneven in squeezing force, sealing is lowered and the structure is complex can be solved, the dewatering efficiency and the reliability of the device are remarkably improved, and meanwhile the operation cost is reduced.

Description

A diaphragm press-type deep dewatering device for coal slime Technical Field

[0001] This utility model relates to the field of solid-liquid separation and material dewatering technology, and in particular to a diaphragm press-type deep dewatering device for coal slime. Background Technology

[0002] Coal slime refers to the fine-particle waste generated during coal washing and processing. It has a high moisture content and typically requires dewatering to achieve resource utilization or reduce environmental pollution. Common coal slime dewatering methods include natural drying, mechanical filtration, and centrifugal dewatering. Among these, mechanical filtration is widely used due to its high efficiency and adaptability. Diaphragm press dewatering devices are a common type of mechanical filtration equipment. They apply pressure to the material through the elastic deformation of the diaphragm, thereby achieving deep dewatering.

[0003] However, existing diaphragm-press coal slime dewatering devices still have certain limitations in practical applications. For example, some devices fail to fully optimize the pressing force distribution of the diaphragm in their design, resulting in less than ideal dewatering efficiency. Furthermore, during continuous operation, the sealing performance of the equipment may deteriorate due to prolonged pressure, affecting the overall dewatering effect. In addition, some devices have complex structural designs, increasing maintenance difficulty and operating costs. Therefore, how to further improve coal slime dewatering efficiency while simplifying the equipment structure and enhancing operational stability has become an urgent problem to be solved. Summary of the Invention

[0004] The purpose of this utility model is to provide a diaphragm-pressed deep dewatering device for coal slime, which solves the problems mentioned in the background art.

[0005] This invention is implemented as follows: a diaphragm-pressed deep dewatering device for coal slime includes a filter press chamber, a pressing assembly, a drive mechanism, and a sealing and control unit. The filter press chamber consists of an upper chamber and a lower chamber, connected by a locking mechanism. Multiple locking mechanisms are evenly distributed around the chamber to ensure a tight fit between the upper and lower chambers. The pressing assembly is installed inside the upper chamber and includes an elastic diaphragm, a support plate, and a pressure regulating component. The elastic diaphragm is fixed to the bottom of the support plate, which is slidably connected to the inner wall of the upper chamber via a slide rail. The slide rail extends longitudinally along the inner wall of the upper chamber, and grooves are provided on both sides of the support plate. These grooves cooperate with the slide rail to allow the support plate to move smoothly within the upper chamber. The pressure regulating component is located on the top of the support plate. The pressure regulating component includes a screw and an adjusting knob. One end of the screw passes through the top of the upper chamber and is threadedly connected to the support plate. The other end is fixedly connected to the adjusting knob. By rotating the adjusting knob, the extension and retraction length of the screw can be changed, thereby adjusting the height position of the support plate and thus controlling the pressing force of the elastic diaphragm on the coal slime.

[0006] The drive mechanism is located at the bottom of the lower chamber and includes a hydraulic cylinder and a transmission rod. The output end of the hydraulic cylinder is hinged to one end of the transmission rod, and the other end of the transmission rod is hinged to the bottom of the support plate. The hydraulic cylinder drives the support plate to move up and down through the transmission rod, thereby realizing the pressing action of the elastic diaphragm. A protective cover is provided on the outside of the hydraulic cylinder, and the protective cover is fixedly connected to the lower chamber by bolts. The inner side wall of the protective cover has a guide groove to discharge the heat and lubricating oil droplets generated during the operation of the hydraulic cylinder, so as to avoid contamination of the coal slurry in the lower chamber.

[0007] The sealing control unit includes a sealing ring, a clamping ring, and an elastic gasket. The sealing ring is embedded between the contact surfaces of the upper and lower chambers. The sealing ring has a trapezoidal cross-section and several raised stripes on its outer side to increase the friction between the sealing ring and the chamber surface, preventing displacement of the sealing ring under high pressure. The clamping ring is fitted over the sealing ring and fixed to the bottom of the upper chamber with screws. The inner side of the clamping ring has a groove that matches the raised stripes of the sealing ring, further enhancing the sealing effect. The elastic gasket is located inside the sealing ring and is made of silicone. Its thickness gradually decreases radially, with the thinnest thickness near the center. This design effectively compensates for the deformation of the sealing ring caused by pressure during long-term use, thereby maintaining the overall sealing performance.

[0008] Preferably, the inner wall of the filter press chamber is provided with multiple sets of guide plates. The guide plates are arc-shaped and evenly distributed on the inner sidewall of the chamber, forming a flow channel between each set of guide plates. The width of the flow channel gradually decreases from top to bottom. This design can guide the coal slime to accumulate towards the central area during the pressing process, reducing the amount of coal slime residue in the edge area and improving pressing efficiency. The surface of the guide plates is coated with a wear-resistant coating with a thickness of 0.5mm to 1mm. The coating material is polytetrafluoroethylene, which has good wear resistance and corrosion resistance.

[0009] Preferably, the bottom of the elastic diaphragm has multiple protrusions, which are hemispherical and evenly distributed on the surface of the diaphragm. The diameter of each protrusion is 5mm to 10mm, the height is 2mm to 4mm, and the spacing between the protrusions is 10mm to 15mm. This design increases the contact area between the elastic diaphragm and the coal slime, and creates local high-pressure zones during the pressing process, further improving the dewatering effect. The elastic diaphragm is made of a high-molecular-weight elastic material with an elastic modulus of 2MPa to 5MPa, which can maintain good resilience while withstanding high pressure.

[0010] Preferably, the pressure regulating component further includes a limiting block, which is fixed to the middle of the screw. A scale mark is provided on the outer side of the limiting block to indicate the extension / retraction length of the screw, facilitating precise control of the support plate's height by the operator. A buffer pad, made of rubber with a thickness of 3mm to 5mm, is provided at the bottom of the limiting block to absorb vibrations generated by the screw during adjustment, preventing impact on the support plate.

[0011] Preferably, a pressure sensor is provided at the output end of the hydraulic cylinder. The pressure sensor is electrically connected to the control system of the hydraulic cylinder. The pressure sensor is used to monitor the output pressure of the hydraulic cylinder in real time and transmit the monitoring data to the control system. The control system automatically adjusts the operating state of the hydraulic cylinder according to the preset pressure range, thereby ensuring the stability and safety of the pressing process.

[0012] Preferably, the sealing control unit further includes a lubrication groove, which is formed on the inner wall of the clamping ring. The lubrication groove is filled with grease, and the grease is a high-temperature and pressure-resistant lubricating material that can maintain good lubrication performance under high pressure and high temperature environments, thus extending the service life of the sealing ring. A dust cover is provided at the opening of the lubrication groove, and the dust cover is connected to the clamping ring by a snap fastener to prevent external dust and impurities from entering the lubrication groove.

[0013] Preferably, the bottom of the filter press chamber is provided with a drain port, which is connected to the interior of the lower chamber. A filter screen with a pore size of 0.1mm to 0.2mm is provided on the inner side of the drain port to intercept solid particles in the coal slime and prevent them from entering the drain pipe and causing blockage. The filter screen is detachably connected to the drain port through a slot for easy regular cleaning and replacement.

[0014] Preferably, a reinforcing rib is provided in the middle of the transmission connecting rod. The reinforcing rib is I-shaped, and its two ends are welded and fixed to the upper and lower surfaces of the transmission connecting rod, respectively. The thickness of the reinforcing rib is 5mm to 8mm, which is used to enhance the bending strength of the transmission connecting rod and prevent it from deforming under high pressure. The surface of the reinforcing rib is polished, and the surface roughness after polishing is Ra0.8μm to Ra1.6μm, so as to reduce the frictional resistance between the transmission connecting rod and other components during the movement.

[0015] This invention solves the problems of uneven pressing force distribution, decreased sealing performance, and complex structure in existing diaphragm-type coal slime dewatering devices by optimizing the design of the pressing components, improving the structure of the sealing control unit, and simplifying the overall structure. The raised blocks at the bottom of the elastic diaphragm increase the contact area and create localized high-pressure zones, improving dewatering efficiency. The combined use of the sealing ring and the clamping ring enhances the sealing effect, while the elastic gasket compensates for the deformation of the sealing ring, extending its lifespan. The combination of the hydraulic cylinder and the transmission linkage achieves efficient pressing action, while the introduction of a pressure sensor ensures the stability and safety of the pressing process. Furthermore, the design of the guide plate and drain port reduces coal slime residue and improves drainage efficiency. The overall structure is simple and easy to maintain, significantly reducing operating costs. Attached Figure Description

[0016] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 is a cross-sectional view of this utility model;

[0018] Figure 3 is a partially enlarged schematic diagram of part A of this utility model.

[0019] The attached figures are labeled as follows:

[0020] 1. Filter press chamber; 2. Upper chamber; 3. Lower chamber; 4. Locking buckle; 5. Elastic diaphragm; 6. Support plate; 7. Slide rail; 8. Screw; 9. Adjusting knob; 10. Hydraulic cylinder; 11. Transmission connecting rod; 12. Protective cover; 13. Sealing ring; 14. Pressing ring; 15. Elastic gasket; 16. Guide plate; 17. Drain port; 18. Filter screen; 19. Protrusion block; 20. Limiting block; 21. Lubrication groove; 22. Dust cover. Detailed Implementation

[0021] This utility model relates to a diaphragm-pressed deep dewatering device for coal slime, the overall structure of which is shown in Figure 1. It includes a filter press chamber 1, a pressing assembly, a drive mechanism, and a sealing control unit. The filter press chamber 1 consists of an upper chamber 2 and a lower chamber 3, connected by a locking mechanism 4. Multiple locking mechanisms 4 are evenly distributed around the chamber. The ends of the locking mechanisms 4 are threaded to the upper chamber 2 and the lower chamber 3, ensuring a tight fit between the two chambers. An annular groove is formed on the contact surface between the bottom of the upper chamber 2 and the top of the lower chamber 3 for embedding a sealing ring 13. The outer side of the sealing ring 13 has raised stripes whose shape matches the groove on the inner side of the clamping ring 14, thereby enhancing the sealing performance. The clamping ring 14 is fixed to the bottom of the upper chamber 2 by screws. An elastic gasket 15 is disposed inside the sealing ring 13, its thickness gradually decreasing radially, with the smallest thickness near the center, to compensate for the deformation of the sealing ring 13 during long-term use.

[0022] The pressing assembly is installed inside the upper chamber 2. Its core components include an elastic diaphragm 5, a support plate 6, and a pressure regulating component. The elastic diaphragm 5 is fixed to the bottom of the support plate 6. The support plate 6 has grooves on both sides, which cooperate with slide rails 7 on the inner wall of the upper chamber 2, as shown in Figure 2. The slide rails 7 extend longitudinally along the inner wall of the upper chamber 2, allowing the support plate 6 to move smoothly within the upper chamber 2. The pressure regulating component includes a screw 8 and an adjusting knob 9. One end of the screw 8 passes through the top of the upper chamber 2 and is threaded to the support plate 6, while the other end is fixedly connected to the adjusting knob 9. A limiting block 20 is fixed to the middle of the screw 8, and its outer side has scale markings to indicate the extension and retraction length of the screw 8. A buffer pad made of rubber, with a thickness of 3mm to 5mm, is provided at the bottom of the limiting block 20 to absorb vibrations generated by the screw 8 during adjustment. By rotating the adjustment knob 9, the extension length of the screw 8 can be changed, thereby adjusting the height position of the support plate 6 and controlling the pressing force of the elastic diaphragm 5 on the coal slime.

[0023] The drive mechanism is located at the bottom of the lower chamber 3, and its core components include a hydraulic cylinder 10 and a transmission link 11. The output end of the hydraulic cylinder 10 is hinged to one end of the transmission link 11, and the other end of the transmission link 11 is hinged to the bottom of the support plate 6. The hydraulic cylinder 10 drives the support plate 6 to move up and down through the transmission link 11, thereby realizing the pressing action of the elastic diaphragm 5. A protective cover 12 is provided on the outside of the hydraulic cylinder 10. The protective cover 12 is fixedly connected to the lower chamber 3 by bolts. The inner side wall of the protective cover 12 has a guide groove to discharge the heat and lubricating oil droplets generated during the operation of the hydraulic cylinder 10, so as to avoid contamination of the coal sludge in the lower chamber 3. A pressure sensor is provided at the output end of the hydraulic cylinder 10. The pressure sensor is electrically connected to the control system of the hydraulic cylinder 10 to monitor the output pressure of the hydraulic cylinder 10 in real time and transmit the monitoring data to the control system. The control system automatically adjusts the operating state of the hydraulic cylinder 10 according to the preset pressure range.

[0024] The sealing control unit includes a sealing ring 13, a clamping ring 14, and an elastic gasket 15, as shown in Figure 3. The sealing ring 13 is embedded between the contact surfaces of the upper chamber 2 and the lower chamber 3. The sealing ring 13 has a trapezoidal cross-section and several raised stripes on its outer side to increase the friction between the sealing ring 13 and the contact surface of the chamber, preventing displacement of the sealing ring 13 under high pressure. The clamping ring 14 is fitted onto the outer side of the sealing ring 13 and is fixed to the bottom of the upper chamber 2 by screws. A groove is formed on the inner side of the clamping ring 14, matching the raised stripes of the sealing ring 13 to further enhance the sealing effect. The elastic gasket 15 is located inside the sealing ring 13. The elastic gasket 15 is made of silicone material, and its thickness gradually decreases radially, with the thinnest thickness near the center. This design effectively compensates for the deformation of the sealing ring 13 caused by pressure during long-term use, thereby maintaining the overall sealing performance. The sealing control unit also includes a lubrication groove 21, which is located on the inner wall of the clamping ring 14. The lubrication groove 21 is filled with grease, which is a high-temperature and pressure-resistant lubricating material that can maintain good lubrication performance under high pressure and high temperature environments, thus extending the service life of the sealing ring 13. A dust cover 22 is provided at the opening of the lubrication groove 21. The dust cover 22 is connected to the clamping ring 14 by a snap-fit ​​to prevent external dust and impurities from entering the lubrication groove 21.

[0025] The inner wall of the filter press chamber 1 is provided with multiple sets of guide plates 16. The guide plates 16 are arc-shaped and evenly distributed on the inner side wall of the chamber, forming a flow channel between each set of guide plates 16. The width of the flow channel gradually decreases from top to bottom. The surface of the guide plates 16 is coated with a wear-resistant coating with a thickness of 0.5mm to 1mm. The coating material is polytetrafluoroethylene, which has good wear resistance and corrosion resistance. The bottom of the elastic diaphragm 5 is provided with multiple protrusions 19. The protrusions 19 are hemispherical and evenly distributed on the surface of the elastic diaphragm 5. The diameter of the protrusions 19 is 5mm to 10mm, the height is 2mm to 4mm, and the spacing between the protrusions 19 is 10mm to 15mm. The elastic diaphragm 5 is made of a high-molecular elastic material with an elastic modulus of 2MPa to 5MPa, which can maintain good resilience while withstanding high pressure.

[0026] The bottom of the filter press chamber 1 is provided with a drain port 17, which is connected to the interior of the lower chamber 3. A filter screen 18 is installed inside the drain port 17. The filter screen 18 has a pore size of 0.1mm to 0.2mm and is used to intercept solid particles in the coal slurry, preventing them from entering the drain pipe and causing blockage. The filter screen 18 is detachably connected to the drain port 17 via a slot, facilitating regular cleaning and replacement. A reinforcing rib is provided in the middle of the transmission connecting rod 11. The reinforcing rib is I-shaped, and its two ends are welded and fixed to the upper and lower surfaces of the transmission connecting rod 11, respectively. The thickness of the reinforcing rib is 5mm to 8mm, used to enhance the bending strength of the transmission connecting rod 11 and prevent deformation under high pressure. The surface of the reinforcing rib is polished, with a surface roughness of Ra0.8μm to Ra1.6μm, to reduce the frictional resistance between the transmission connecting rod 11 and other components during movement.

[0027] In practical applications, the coal slime to be dewatered is first placed into the lower chamber 3. Then, the upper chamber 2 and lower chamber 3 are tightly connected via the locking buckle 4, ensuring optimal sealing between the sealing ring 13 and the clamping ring 14. The hydraulic cylinder 10 is activated, pushing the support plate 6 upwards via the transmission connecting rod 11. The support plate 6 then applies pressure to the coal slime using the elastic diaphragm 5. During the pressing process, the protrusions 19 at the bottom of the elastic diaphragm 5 contact the coal slime, forming a localized high-pressure zone, further enhancing the dewatering effect. Simultaneously, the guide plate 16 guides the coal slime towards the central area, reducing the amount of slime remaining at the edges. The liquid generated during pressing flows through the guide channel to the drain port 17, and is discharged after being filtered by the filter screen 18 to intercept solid particles. A pressure sensor monitors the output pressure of the hydraulic cylinder 10 in real time and transmits the data to the control system. The control system automatically adjusts the operating state of the hydraulic cylinder 10 according to the preset pressure range, ensuring the stability and safety of the pressing process. After pressing is completed, the height of the support plate 6 is lowered by rotating the adjustment knob 9 to release the pressure of the elastic diaphragm 5, and the lock 4 is opened to separate the upper chamber 2 and the lower chamber 3, and the dewatered coal slime is taken out.

[0028] To enable those skilled in the art to fully understand and implement this utility model, the specific implementation principle of this utility model is further explained below in conjunction with a specific application scenario.

[0029] In actual operation, the coal slurry to be dewatered is first evenly filled into the lower chamber 3, and then the upper chamber 2 and the lower chamber 3 are tightly connected by the locking buckle 4. The end of the locking buckle 4 is fixed to the contact surface of the upper and lower chambers by threads to ensure a tight fit between the upper and lower chambers. At this time, the sealing ring 13 is embedded between the contact surfaces of the upper chamber 2 and the lower chamber 3, and the raised stripes on its outer side match the groove on the inner side of the clamping ring 14, thereby enhancing the sealing performance. The clamping ring 14 is fixed to the bottom of the upper chamber 2 by screws, and the elastic gasket 15 is set inside the sealing ring 13. Its thickness gradually decreases along the radial direction to compensate for the deformation of the sealing ring 13 due to long-term use, thereby maintaining the overall sealing effect.

[0030] After the hydraulic cylinder 10 is activated, its output end pushes the support plate 6 upward via the transmission link 11. The sliding grooves on both sides of the support plate 6 cooperate with the slide rails 7 on the inner wall of the upper chamber 2, allowing the support plate 6 to move smoothly within the upper chamber 2. The support plate 6 drives the elastic diaphragm 5 to apply pressure to the coal slime. The protrusions 19 at the bottom of the elastic diaphragm 5 contact the coal slime, forming a localized high-pressure zone. This design increases the contact area between the elastic diaphragm 5 and the coal slime, and creates a higher pressing force at the contact point, thereby improving dewatering efficiency. The elastic diaphragm 5 is made of a high-molecular-weight elastic material with an elastic modulus of 2MPa to 5MPa, which can maintain good resilience while withstanding high pressure, preventing deformation or damage due to long-term use.

[0031] Meanwhile, the guide plates 16 guide the coal slime towards the central area, reducing the amount of coal slime residue in the edge areas. The guide plates 16 are arc-shaped and evenly distributed on the inner wall of the filter press chamber 1. The width of the guiding channel formed between each group of guide plates 16 gradually decreases from top to bottom. This design can effectively improve the fluidity of the coal slime and the pressing efficiency. The polytetrafluoroethylene wear-resistant coating on the surface of the guide plates 16 has good corrosion resistance, which can extend the service life of the guide plates 16 and reduce the wear of the guide plates 16 by the coal slime during the pressing process.

[0032] During the pressing process, the liquid flows through the guide channel to the drain port 17, and is discharged after being filtered by the filter screen 18 to intercept solid particles. The filter screen 18 has a pore size of 0.1mm to 0.2mm, which effectively prevents solid particles in the coal slime from entering the drain pipe and causing blockage. The filter screen 18 is detachably connected to the drain port 17 via a slot, facilitating regular cleaning and replacement. A pressure sensor is installed at the output end of the hydraulic cylinder 10. The pressure sensor monitors the output pressure of the hydraulic cylinder 10 in real time and transmits the data to the control system. The control system automatically adjusts the operating state of the hydraulic cylinder 10 according to the preset pressure range, thereby ensuring the stability and safety of the pressing process.

[0033] After pressing, the height of the support plate 6 is lowered by rotating the adjusting knob 9. One end of the screw 8 passes through the top of the upper chamber 2 and is threadedly connected to the support plate 6, while the other end is fixedly connected to the adjusting knob 9. By rotating the adjusting knob 9, the extension length of the screw 8 can be changed, thereby precisely controlling the height position of the support plate 6. The limiting block 20 is fixed to the middle of the screw 8, and its outer side is provided with scale marks to indicate the extension length of the screw 8, facilitating precise adjustment by the operator. The buffer pad at the bottom of the limiting block 20 is made of rubber with a thickness of 3mm to 5mm, which can absorb the vibration generated by the screw 8 during adjustment and prevent impact on the support plate 6.

[0034] Finally, unlock 4 to separate the upper chamber 2 and the lower chamber 3, and remove the dehydrated coal slurry. During this process, the high-temperature, pressure-resistant grease filled in the lubrication groove 21 of the sealing control unit reduces friction between the sealing ring 13 and the clamping ring 14, extending the service life of the sealing ring 13. A dust cover 22 is provided at the opening of the lubrication groove 21. The dust cover 22 is connected to the clamping ring 14 by a snap-fit, which prevents external dust and impurities from entering the lubrication groove 21, thereby further protecting the stability of the sealing structure.

[0035] Through the above steps, this invention achieves efficient dewatering of coal slime, while optimizing the sealing performance and operational stability of the equipment, and significantly reducing maintenance costs and operational difficulty.

[0036] 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 and improvements 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 diaphragm-pressed deep dewatering device for coal slime, comprising a filter press chamber (1), a pressing assembly, a drive mechanism, and a sealing control unit, characterized in that: The filter press chamber (1) consists of an upper chamber (2) and a lower chamber (3). The upper chamber (2) and the lower chamber (3) are connected by a latch (4), which is evenly distributed around the chamber. The pressing assembly is installed inside the upper chamber (2) and includes an elastic diaphragm (5), a support plate (6), and a pressure regulating component. The elastic diaphragm (5) is fixed to the bottom of the support plate (6). The support plate (6) is slidably connected to the inner wall of the upper chamber (2) via a slide rail (7). The pressure regulating component includes a screw (8) and an adjusting knob (9). One end of the screw (8) passes through the top of the upper chamber (2) and is threadedly connected to the support plate (6). The other end is connected to the adjusting knob (9). 9) Fixed connection; The drive mechanism is located at the bottom of the lower compartment (3) and includes a hydraulic cylinder (10) and a transmission link (11). The output end of the hydraulic cylinder (10) is hinged to one end of the transmission link (11), and the other end of the transmission link (11) is hinged to the bottom of the support plate (6). The sealing control unit includes a sealing ring (13), a pressing ring (14), and an elastic gasket (15). The sealing ring (13) is embedded between the contact surfaces of the upper compartment (2) and the lower compartment (3). The pressing ring (14) is sleeved on the outside of the sealing ring (13) and fixed to the bottom of the upper compartment (2) by screws. The elastic gasket (15) is set inside the sealing ring (13).

2. The diaphragm press-type deep dewatering device for coal slime according to claim 1, characterized in that: The inner wall of the filter press chamber (1) is provided with multiple sets of guide plates (16). The guide plates (16) are arc-shaped and evenly distributed on the inner side wall of the chamber. Each set of guide plates (16) forms a guide channel, and the width of the guide channel gradually decreases from top to bottom.

3. A membrane press type coal slime deep dewatering device according to claim 1, characterized in that: The bottom of the elastic diaphragm (5) is provided with a plurality of protrusions (19). The protrusions (19) are hemispherical and evenly distributed on the surface of the elastic diaphragm (5). The distance between the protrusions (19) is 10 mm to 15 mm.

4. The diaphragm press-type deep dewatering device for coal slime according to claim 1, characterized in that: The pressure regulating component also includes a limiting block (20), which is fixed to the middle of the screw (8). The limiting block (20) has scale markings on its outer side and a buffer pad at its bottom, which is made of rubber.

5. A diaphragm-press type deep dewatering device for coal slime according to claim 1, characterized in that: A pressure sensor is provided at the output end of the hydraulic cylinder (10), and the pressure sensor is electrically connected to the control system of the hydraulic cylinder (10).

6. The diaphragm press-type deep dewatering device for coal slime according to claim 1, characterized in that: The sealing control unit also includes a lubrication groove (21), which is located on the inner wall of the clamping ring (14). The lubrication groove (21) is filled with grease, and a dust cover (22) is provided at the opening of the lubrication groove (21). The dust cover (22) is connected to the clamping ring (14) by a snap fastener.

7. The diaphragm press-type deep dewatering device for coal slime according to claim 1, characterized in that: The bottom of the filter press chamber (1) is provided with a drain port (17), which is connected to the interior of the lower chamber (3). A filter screen (18) is provided on the inner side of the drain port (17). The pore size of the filter screen (18) is 0.1 mm to 0.2 mm. The filter screen (18) is detachably connected to the drain port (17) through a slot.

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