Screening device for power coal preparation plant
By introducing water outlet pipes and air outlet pipes into the screening device, combined with a sliding screen and threaded rod structure, the problems of complex structure and clogging in existing devices are solved, achieving efficient screen cleaning and improving cleaning convenience and work efficiency.
Patent Information
- Application Number
- CN202422910145.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2034-11-27
AI Technical Summary
The screening devices used in existing thermal coal preparation plants have complex structures and require complicated cleaning methods, which can easily lead to screen blockage and affect work efficiency.
The design incorporates water and air outlet ducts, using clean water and drying gas to clean the screening screen. Combined with the sliding screening screen and threaded rod structure, it achieves a simple and efficient cleaning process.
It improves the ease and efficiency of cleaning the screening device, avoids screen clogging, and enhances work efficiency.
Smart Images
Figure CN223788960U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power coal technology, specifically a screening device for power coal preparation plants. Background Technology
[0002] Thermal coal refers to coal used as a fuel for power generation. In a narrow sense, it generally refers to coal used for thermal power generation. In a broader sense, any coal used for power generation, locomotive propulsion, boiler combustion, etc., to produce power, is considered thermal coal. The characteristics of fuel coal include two aspects: coal properties and ash properties. Coal properties refer to the coal's moisture content, ash content, volatile matter, fixed carbon, elemental content (carbon, hydrogen, oxygen, nitrogen, sulfur), calorific value, ignition temperature, grindability, and particle size. These indicators are directly related to combustion, processing (e.g., grinding into pulverized coal), transportation, and storage.
[0003] Extensive research revealed that the Chinese Utility Model Patent Announcement No. CN218251503U discloses a screening device for a power coal preparation plant, relating to the field of power coal technology. The device includes a screening box with a vibration assembly at its bottom, a side plate fixedly connected to the side of the screening box, a screening mesh inclinedly arranged inside the screening box, and discharge ports equidistantly spaced along the vertical direction on the side of the screening box. A U-shaped plate is fixedly connected to the side of the discharge port, and a blocking plate is movably inserted into the U-shaped plate along the vertical direction. A vibration motor is fixedly connected to the bottom of the side of the screening box.
[0004] While the above solution offers numerous advantages, its complex structure and cumbersome cleaning methods, coupled with the use of cleaning water which results in liquid adhering to the screen surface, and the lack of a drying structure, all contribute to increased material viscosity and a greater quantity and area of material adhering to the screen surface during operation. This exacerbates screen clogging and negatively impacts the efficiency of screening devices used in power coal preparation plants. Utility Model Content
[0005] The purpose of this utility model is to provide a screening device for power coal preparation plants, so as to solve the problem of complex structure of the screening devices currently used in power coal preparation plants in the prior art.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a screening device for a power coal preparation plant, comprising a machine body, a threaded rod rotatably connected to the inner cavity of the machine body, a screening screen threadedly fitted on the outer side of the threaded rod, a through threaded hole on one side of the screening screen, the threaded rod being threadedly connected to the threaded hole, the screening screen being slidably connected in the inner cavity of the machine body, a water outlet conduit and two baffles installed in the inner cavity of the machine body, the bottom of the water outlet conduit being provided with a linear array of water outlet holes, and the water outlet conduit being located above the screening screen, the two baffles being located above and below the screening screen respectively, and both baffles being located on one side of the water outlet conduit; a water pump outlet is externally connected to the end of the water outlet conduit, and the water pump is located in a water source.
[0007] Preferably, a blower is installed inside the machine body, and two sets of air outlet ducts are installed on the inner wall of the machine body. One end of the air outlet duct is fixedly connected to the air outlet port of the blower. The two sets of air outlet ducts are located on the upper and lower sides of the screening screen, and an air outlet is provided on the opposite side of the two sets of air outlet ducts. The water outlet duct is located between the baffle and the air outlet duct.
[0008] Preferably, the inner wall of the machine body is rotatably connected to rollers, and two adsorption pads are provided on the outer sides of the two rollers. The two adsorption pads are located on the upper and lower sides of the screening screen, respectively, and the air outlet duct is located between the water outlet duct and the adsorption pads.
[0009] Preferably, an extrusion frame is slidably connected to the inner wall of the machine, and an extrusion rod is rotatably connected to one side of the extrusion frame. The extrusion rod is in contact with both adsorption pads. A cylinder is installed on the inner wall of the machine, and the telescopic end of the cylinder is fixedly connected to one side of the extrusion frame. Two telescopic rods are provided between the extrusion frame and the inner wall of the machine, and the two telescopic rods are located on both sides of the cylinder.
[0010] Preferably, the inner cavity of the machine body is divided into a screening chamber and a cleaning chamber by a baffle. The extrusion frame, rollers, and water outlet pipe are all located in the cleaning chamber. A through-type feed inlet is formed on the top wall of the machine body inside the screening chamber, and a discharge port and a sludge outlet are formed on one side of the machine body in the screening chamber. The sludge outlet and the discharge port are located above and below one end of the screening screen, respectively. A water outlet is formed on the inner wall of one side of the machine body in the cleaning chamber, and the water outlet is located below the screening screen.
[0011] Preferably, one side of the machine body is rotatably connected to mutually meshing gears, and the shaft center of one side of the two gears is fixedly connected to one end of the two roller shafts respectively. Two servo motors are installed on the machine body, and the movable shafts of the two servo motors are fixedly connected to one side of the gears and one end of the threaded rod respectively. The servo motors, blowers and cylinders used in this application are all purchased parts, and the selection of parts is based on the power and size requirements. This application will not elaborate further.
[0012] Preferably, a stabilizing rod is fixedly connected to the inner cavity of the machine body, and a through-type stabilizing groove is opened at one end of the screening screen. The stabilizing rod is slidably connected to the cavity of the stabilizing groove. The screening screen is located between the threaded rod and the stabilizing rod, and the threaded rod and the stabilizing rod are arranged parallel to each other.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] 1. This application, by setting up a water outlet pipe, a threaded rod and a sliding screen, only requires rotating the threaded rod to slide the screen below the water outlet pipe, and then using the cleaning water sprayed from the water outlet pipe to clean the screen. The device has a simple structure and is easy to use, thus effectively improving the cleaning convenience of screening devices used in power coal preparation plants.
[0015] 2. This application uses an air outlet duct and an adsorption pad to remove liquid adhering to the surface of the screening screen, thereby drying the screening screen and preventing the screening raw materials from coming into contact with the liquid. Therefore, it can effectively improve the cleaning efficiency and practicality of the screening screen. Attached Figure Description
[0016] Figure 1 This is a three-dimensional schematic diagram of the overall structure of a screening device for a power coal preparation plant according to the present invention.
[0017] Figure 2 This is a three-dimensional cross-sectional view of the screening device for a power coal preparation plant according to the present invention.
[0018] Figure 3 This is a three-dimensional cross-sectional view of the screening device for a power coal preparation plant according to the present invention.
[0019] Figure 4 This is a three-dimensional schematic diagram of the combination of the extrusion frame, screening screen and air outlet duct of a screening device for a power coal preparation plant according to the present invention;
[0020] Figure 5 This is a three-dimensional schematic diagram of the combination of the extrusion frame and the adsorption pad of a screening device for a power coal preparation plant according to the present invention.
[0021] The following are the labels in the diagram: 1. Machine body; 2. Threaded rod; 3. Screening screen; 4. Stabilizing rod; 5. Water outlet pipe; 6. Baffle; 7. Blower; 8. Air outlet pipe; 9. Adsorption pad; 10. Extrusion frame; 11. Extrusion rod; 12. Cylinder; 13. Feed inlet; 14. Discharge outlet; 15. Sewage outlet; 16. Water outlet; 17. Gear; 18. Servo motor. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0023] Example: Figure 1 - Figure 5 As shown, this utility model provides a technical solution for a screening device used in a power coal preparation plant, including a body 1. A threaded rod 2 is rotatably connected to the inner cavity of the body 1. A screening screen 3 is threadedly sleeved on the outer side of the threaded rod 2. A through threaded hole is opened on one side of the screening screen 3. The threaded rod 2 is threadedly connected to the threaded hole. The screening screen 3 is slidably connected in the inner cavity of the body 1. A water outlet pipe 5 and two baffles 6 are installed in the inner cavity of the body 1. The bottom of the water outlet pipe 5 is provided with a linear array of water outlet holes, and the water outlet pipe 5 is located above the screening screen 3. The two baffles 6 are located above and below the screening screen 3, respectively, and both baffles 6 are located on one side of the water outlet pipe 5. The end of the water outlet pipe 5 is connected to the water outlet of a water pump, and the water pump is located in a water source.
[0024] When cleaning the screening screen 3 is required, simply move the screening screen 3 from the screening chamber to the cleaning chamber. During the movement within the cleaning chamber cavity, use the controller to start the water pump to deliver cleaning liquid into the water outlet pipe 5. The cleaning liquid is sprayed out through the water outlet and cleans the surface of the screening screen 3.
[0025] like Figure 2 - Figure 4 As shown, a blower 7 is installed inside the machine body 1, and two sets of air outlet ducts 8 are installed on the inner wall of the machine body 1. One end of the air outlet duct 8 is fixedly connected to the air outlet port of the blower 7. The two sets of air outlet ducts 8 are located on the upper and lower sides of the screening screen 3, and air outlets are provided on the opposite side of the two sets of air outlet ducts 8. The water outlet duct 5 is located between the baffle 6 and the air outlet duct 8.
[0026] During the movement of the screening screen 3 within the cleaning chamber cavity, the screening screen 3 first passes through the water outlet pipe 5, which cleans the screening screen 3. Then, the screening screen 3 passes through the air outlet pipe 8, which dries the liquid adhering to the surface of the screening screen 3. After that, the screening screen 3 passes through the adsorption pad 9, which adsorbs the remaining liquid. After the screening screen 3 has completely passed through the water outlet pipe 5, the water pump on the water outlet pipe 5 will stop running, while the blower 7 will continue to run. During the process of the screening screen 3 resetting and returning to the screening chamber, it will pass through the adsorption pad 9 again for adsorption and the air outlet pipe 8 for drying.
[0027] The blower 7 delivers drying gas into the air outlet duct 8, and the drying gas is then blown onto the surface of the screen 3 through the air outlet.
[0028] like Figure 2 - Figure 4 As shown, rollers are rotatably connected to the inner wall of the machine body 1, and adsorption pads 9 are provided on the outer sides of the two rollers. The two adsorption pads 9 are located on the upper and lower sides of the screening screen 3, respectively, and the air outlet duct 8 is located between the water outlet duct 5 and the adsorption pads 9.
[0029] The adsorption pad 9 is made of a soft material such as sponge that can absorb liquid. When the sieve 3 passes through the adsorption pad 9, the sieve 3 will squeeze the adsorption pad 9, thereby slightly deforming the adsorption pad 9 and increasing the contact area between the adsorption pad 9 and the surface of the sieve 3.
[0030] like Figure 2 - Figure 5 As shown, an extrusion frame 10 is slidably connected to the inner wall of the machine body 1, and an extrusion rod 11 is rotatably connected to one side of the extrusion frame 10. The extrusion rod 11 is in contact with both adsorption pads 9. A cylinder 12 is installed on the inner wall of the machine body 1, and the telescopic end of the cylinder 12 is fixedly connected to one side of the extrusion frame 10. Two telescopic rods are provided between the extrusion frame 10 and the inner wall of the machine body 1, and the two telescopic rods are located on both sides of the cylinder 12.
[0031] When the adsorption pad 9 adsorbs too much liquid, the cylinder 12 drives the extrusion frame 10 to approach the adsorption pad 9, and the extrusion rod 11 simultaneously contacts and extrudes the two adsorption pads 9. Then, the adsorption pad 9 is slowly rotated by rotating the roller shaft, thereby extruding the liquid from the adsorption pad 9.
[0032] like Figure 1 - Figure 5 As shown, the inner cavity of the machine body 1 is divided into a screening chamber and a cleaning chamber by a baffle 6. The extrusion frame 10, roller and water outlet pipe 5 are all located in the cleaning chamber. A through-type feed inlet 13 is formed on the top wall of the machine body 1 inside the screening chamber. A discharge outlet 14 and a drain outlet 15 are formed on one side of the machine body 1 in the screening chamber. The drain outlet 15 and the discharge outlet 14 are located on the upper and lower sides of one end of the screening screen 3, respectively. A water outlet 16 is formed on the inner wall of one side of the machine body 1 in the cleaning chamber. The water outlet 16 is located below the screening screen 3.
[0033] Raw materials fall onto the screening screen 3 through the feed inlet 13. The screening screen 3 is used to screen the raw materials. The screened raw materials are discharged through the discharge outlet 14, while unfiltered raw material impurities are discharged from the drain outlet 15. When the screening screen 3 needs to be cleaned, the screening screen 3 is moved into the cleaning chamber. At this time, the cleaning water used to clean the screening screen 3 in the cleaning chamber will be discharged from the water outlet 16.
[0034] The screening chamber is equipped with a vibrator on its inner wall. The screening screen 3 is in contact with one side of the screening screen 3. The vibrator drives the screening screen 3 to vibrate by its own vibration, thereby enabling the screening screen 3 to screen the material.
[0035] like Figure 1 - Figure 5 As shown, gears 17 are rotatably connected to one side of the machine body 1, and the shafts of the two gears 17 are respectively fixedly connected to one end of the two roller shafts. Two servo motors 18 are installed on the machine body 1, and the movable shafts of the two servo motors 18 are respectively fixedly connected to one side of the gears 17 and one end of the threaded rod 2. The servo motors 18, blowers 7 and cylinders 12 used in this application are all purchased parts, and they are selected according to the power and size requirements. This application will not elaborate on them further.
[0036] A controller is installed on the body 1; the servo motor 18, blower 7, cylinder 12, vibrator and water pump are all electrically connected to the controller, and the controller is electrically connected to the power supply. The controller is used to control the start and stop of the servo motor 18, blower 7 and cylinder 12 and other equipment. The controller, vibrator and water pump used in this application are all purchased parts. They are selected according to the power and size requirements. The control switch system adopts the module provided by the corresponding vendor. The controller, vibrator and water pump are all existing technology equipment. The specific form, usage and installation method are all existing technology means. This application will not elaborate on them.
[0037] Two servo motors 18 are used to drive one of the gears 17 or the threaded rod 2 to rotate in both directions. The gear 17 drives the other gear 17 to rotate in the opposite direction, so that the two rollers rotate together. This facilitates the cooperation with the extrusion rod 11 to extrude the liquid adsorbed in the adsorption pad 9.
[0038] like Figure 1 - Figure 5 As shown, a stabilizing rod 4 is fixedly connected to the inner cavity of the machine body 1, and a through-type stabilizing groove is opened at one end of the screening screen 3. The stabilizing rod 4 is slidably connected to the cavity of the stabilizing groove. The screening screen 3 is located between the threaded rod 2 and the stabilizing rod 4, and the threaded rod 2 and the stabilizing rod 4 are arranged parallel to each other.
[0039] The stability of the screen 3 is increased by using the stabilizer bar 4.
[0040] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A screening device for a power coal preparation plant, comprising a body (1), characterized in that: The inner cavity of the machine body (1) is rotatably connected to a threaded rod (2), and a screening screen (3) is threadedly sleeved on the outer side of the threaded rod (2). The screening screen (3) is slidably connected in the inner cavity of the machine body (1). The inner cavity of the machine body (1) is equipped with a water outlet pipe (5) and two baffles (6). The bottom of the water outlet pipe (5) is provided with a linear array of water outlet holes, and the water outlet pipe (5) is located above the screening screen (3). The two baffles (6) are located on the upper and lower sides of the screening screen (3), and both baffles (6) are located on one side of the water outlet pipe (5).
2. The screening device for a power coal preparation plant according to claim 1, characterized in that: A blower (7) is installed inside the body (1). Two sets of air outlet ducts (8) are installed on the inner wall of the body (1). One end of the air outlet duct (8) is fixedly connected to the air outlet port of the blower (7). The two sets of air outlet ducts (8) are located on the upper and lower sides of the screening screen (3), and air outlets are provided on the opposite side of the two sets of air outlet ducts (8). The water outlet duct (5) is located between the baffle (6) and the air outlet duct (8).
3. A screening device for a power coal preparation plant according to claim 2, characterized in that: The inner wall of the machine body (1) is rotatably connected with rollers, and two adsorption pads (9) are provided on the outer side of the two rollers. The two adsorption pads (9) are located on the upper and lower sides of the screening screen (3) respectively, and the air outlet duct (8) is located between the water outlet duct (5) and the adsorption pads (9).
4. A screening device for a power coal preparation plant according to claim 3, characterized in that: The inner wall of the machine body (1) is slidably connected to an extrusion frame (10), and an extrusion rod (11) is rotatably connected to one side of the extrusion frame (10). The extrusion rod (11) is in contact with both adsorption pads (9). A cylinder (12) is installed on the inner wall of the machine body (1), and the telescopic end of the cylinder (12) is fixedly connected to one side of the extrusion frame (10).
5. A screening device for a power coal preparation plant according to claim 4, characterized in that: The inner cavity of the machine body (1) is divided into a screening chamber and a cleaning chamber by a baffle (6). The extrusion frame (10), roller and water outlet pipe (5) are all located in the cleaning chamber. The machine body (1) has a through-type feed inlet (13) formed on the top wall inside the screening chamber. The machine body (1) has a discharge port (14) and a sewage outlet (15) formed on one side of the screening chamber. The sewage outlet (15) and the discharge port (14) are located on the upper and lower sides of one end of the screening screen (3), respectively. The machine body (1) has a water outlet (16) formed on the inner wall of one side of the cleaning chamber. The water outlet (16) is located below the screening screen (3).
6. A screening device for a power coal preparation plant according to claim 1, characterized in that: One side of the machine body (1) is rotatably connected to gears (17) that mesh with each other. The two gears (17) are fixedly connected to one end of two roller shafts at the center of their respective sides. Two servo motors (18) are installed on the machine body (1). The movable shafts of the two servo motors (18) are fixedly connected to one side of the gears (17) and one end of the threaded rod (2), respectively.
7. A screening device for a power coal preparation plant according to claim 1, characterized in that: A stabilizing rod (4) is fixedly connected to the inner cavity of the machine body (1), and a through-type stabilizing groove is opened at one end of the screening screen (3). The stabilizing rod (4) is slidably connected to the cavity of the stabilizing groove.