Continuous screening equipment and method thereof

Abstract

The invention discloses continuous screening equipment and a method thereof, and belongs to the technical field of coal mine screening. The continuous screening equipment comprises a vibration screening mechanism and further comprises an adjustable coarse screening mechanism; the adjusting type coarse screening mechanism comprises a machine box, a first conveying belt assembly, first adjusting type screening modules and second adjusting type screening modules, the first conveying belt assembly, the first adjusting type screening modules and the second adjusting type screening modules are installed in the machine box, and the first conveying belt assembly and the two first adjusting type screening modules are distributed in a step shape from back to front; the lower side of the first adjusting type screening module and the lower side of the second adjusting type screening module are each provided with an adjusting type transferring mechanism. The two vibration screening mechanisms are located on the two sides of the machine box correspondingly. The adjusting type transferring mechanism comprises a double-channel discharging module, a third conveying belt assembly and a fourth conveying belt assembly. The side edge of the machine box is provided with a return material lifting machine used for feeding finest materials screened out by the vibration screening mechanism on the front side to the fourth conveying belt assembly on the rear side. In this way, the residence time of particle materials of different sizes on different screening modules is changed, and the screening efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of coal mine screening technology, specifically to a continuous screening device and method. Background Technology

[0002] After coal mining, it is crushed to a particle size that can be processed by screening equipment through jaw crushers and impact crushers. Then, impurities such as gangue and iron filings need to be separated. At the same time, the ore needs to be graded and screened according to its size. If the raw coal has a high moisture content, it needs to be removed by vibrating screen to prevent fine mud from sticking to the screen and affecting the screening efficiency.

[0003] For example, Chinese patent CN115463822B discloses an automated feeding coal screening system. It can achieve automated feeding through a rotary feeding unit and a screw conveyor unit. Through the adjustment component, the distance between the screening ring plates can be adjusted to adjust the screening particle size. It can screen coal according to needs to obtain coal with the ideal particle size.

[0004] However, during screening, the proportion of particles of different sizes may vary in different batches of coal. Currently, the same screening process is used in multi-stage continuous screening, which can lead to insufficient screening or wasted energy. If there are few large coal particles that do not need to be screened, there will be fewer large coal particles to be screened at the end of the primary screening structure after the initial screening. The large coal particles that have not been screened will remain in the primary screening structure for a long time, resulting in wasted energy. If there are many coal particles that need to be screened, the coal particles that need to be screened will not remain in the primary screening structure for a sufficient time, resulting in insufficient screening. At the same time, the current secondary screening structure has a fixed screening flow rate. When the amount of coal particles that need to be screened exceeds the fixed screening flow rate of the secondary screening structure, the secondary screening structure will not be able to screen in time. In addition, it is difficult to clean coal particles stuck on the screen.

[0005] Based on this, the present invention designs a continuous screening device and method to solve the above problems. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a continuous screening device and method thereof.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A continuous screening device includes a vibrating screening mechanism and an adjustable coarse screening mechanism; The adjustable coarse screening mechanism includes a housing, a conveyor belt assembly 1, an adjustable screening module 1, and an adjustable screening module 2. The conveyor belt assembly 1, the adjustable screening module 1, and the adjustable screening module 2 are installed inside the housing. The conveyor belt assembly 1 and the two adjustable screening modules 1 are arranged in a stepped manner from back to front. An adjustable transfer mechanism is distributed on the lower side of both the adjustable screening module 1 and the adjustable screening module 2. Two vibrating screening mechanisms are located on both sides of the housing. The adjustable conveying mechanism includes a dual-channel discharge module, a conveyor belt assembly three, and a conveyor belt assembly four. The dual-channel discharge module is mounted on the chassis and is located below the adjustable screening modules one and two. The conveyor belt assemblies three and four are fixedly mounted on the chassis and are located below the dual-channel discharge module. The conveyor belt assembly four is located below the dual-channel discharge module on the side away from the vibrating screening mechanism, and the feed end of the vibrating screening mechanism is aligned with the discharge end of the conveyor belt assembly three. The sides of the chassis are equipped with return elevators for feeding the finest material screened by the front vibrating screening mechanism to the rear conveyor belt assembly four.

[0008] Furthermore, the vibrating screening mechanism includes a vibrating structure, a combined screen, a lifting module, and a locking module. The combined screen is installed on the vibrating structure, and multiple lifting modules for assembling the combined screen are symmetrically installed on the vibrating structure. Multiple locking modules for locking the combined screen are symmetrically installed on the vibrating structure.

[0009] Furthermore, the adjustable screening module includes a hydraulic cylinder, a guide rail, a movable frame, and a roller screen. The guide rail is symmetrically and fixedly installed inside the machine housing, and the movable frame is slidably connected to the guide rails on both sides. The roller screen is fixedly installed on the movable frame. The hydraulic cylinder is symmetrically and fixedly installed inside the machine housing, and the output end of the hydraulic cylinder is fixedly connected to the movable frame.

[0010] Furthermore, the dual-channel discharge module includes a fixed inclined hopper, a movable inclined baffle, a collection hopper, a discharge frame one, and a discharge frame two. A fixed inclined hopper is fixedly installed under the movable frame one and the adjustable screening module two, respectively, inside the machine housing. Movable inclined baffles are fixedly installed at the front of the adjustable screening module two and the movable frame one, respectively, and the movable inclined baffles are inserted into the fixed inclined hopper from the front. Two collection hoppers are fixedly installed under each fixed inclined hopper. A discharge frame one is fixedly installed under the collection hopper on one side, and a discharge frame two is fixedly installed under the collection hopper on the other side.

[0011] Furthermore, discharge frame one is located on the upper side of conveyor belt assembly three, and discharge frame two is located on the upper side of conveyor belt assembly four; the distance between the bottom of discharge frame one and the upper surface of conveyor belt assembly three is greater than the distance between the bottom of discharge frame two and the upper surface of conveyor belt assembly four.

[0012] Furthermore, the vibration structure includes a support platform, spring 1, and a screen box. The screen box is located on the upper side of the support platform, and multiple spring 1 are symmetrically distributed between the screen box and the support platform. One end of spring 1 is fixedly connected to the support platform, and the other end of spring 1 is fixedly connected to the screen box. A vibrator driven by a motor is fixedly installed on the screen box.

[0013] Furthermore, the combined screen includes a fixed screen, a movable screen frame, a movable screen, a second spring, guide rods, and a reinforcing plate. The fixed screen is fixedly installed on the screen box, the movable screen frame is located below the fixed screen, and the movable screen is fixedly installed on the movable screen frame. Multiple guide rods are symmetrically fixedly installed on the screen box. The movable screen frame and the guide rods are slidably connected. A second spring is sleeved on the guide rod, one end of the second spring is fixedly connected to the movable screen frame, and the other end of the second spring is fixedly connected to the screen box. A reinforcing plate for supporting the movable screen is fixedly installed on the lower side of the movable screen frame.

[0014] Furthermore, the locking module includes a fixed box, a telescopic rod, a spring, a pad, and an unlocking component. The fixed box is fixedly installed on the screen box, and a pad for supporting the movable screen frame is inserted into the inside of the fixed box. Multiple sets of telescopic rods are distributed between the pad and the fixed box. One end of the telescopic rod is fixedly connected to the fixed box, and the other end of the telescopic rod is fixedly connected to the pad. A spring is sleeved on the outside of the telescopic rod. One end of the spring is fixedly connected to the fixed box, and the other end of the spring is fixedly connected to the pad. An unlocking component is installed on the fixed box and the pad.

[0015] Furthermore, the unlocking components include magnetic metal blocks and electromagnets. Magnetic metal blocks are symmetrically fixed inside the pad, and electromagnets for attracting magnetic metal blocks are symmetrically fixed on the fixing box.

[0016] To better achieve the objectives of this invention, this invention also provides a continuous screening method for coal mines, comprising the following steps: Step 1: Adjust the regulating screening module 1 and regulating screening module 2 according to the particle size of the material to change the residence time of the material on the regulating screening module 1 and regulating screening module 2; Step 2: The material to be screened is fed onto the adjustable screening module 1 via conveyor belt assembly 1, and the material is conveyed and screened from the adjustable screening module 1 to the adjustable screening module 2. Step 3: The screened material falls onto conveyor belt assembly three and conveyor belt assembly four respectively after passing through the dual-channel discharge module. If the amount of material and the screening speed of the vibration structure and the combined screen match, both conveyor belt assembly three and conveyor belt assembly four will move the material closer to the vibration structure. If the amount of material is greater than the screening capacity of the combined screen, conveyor belt assembly three will move the material closer to the vibration structure, and conveyor belt assembly four will move the material away from the vibration structure. Step 4: The material is screened a second time using a vibrating structure and a combined screen. Meanwhile, the medium-sized particles that have passed through the second screen of the adjustable screening module are conveyed to the vibrating structure and the combined screen through the dual-channel discharge module, conveyor belt assembly three, and conveyor belt assembly four below it for further screening. The finest material obtained from the screening is then conveyed to conveyor belt assembly four below the adjustable screening module via a return material elevator.

[0017] Compared with the prior art, the beneficial effects of this invention are as follows: 1. Adjustable screening module one and adjustable screening module two for adjusting the particle size of the material. By extending or contracting the adjustable screening module one and adjustable screening module two, the material residence time can be changed, thereby improving screening efficiency and reducing energy consumption. 2. If the amount of granular material and the screening speed of the vibration structure and the combined screen are matched, both conveyor belt assembly three and conveyor belt assembly four will move the material closer to the vibration structure, so that the material falling from the dual-channel discharge module onto conveyor belt assembly three and conveyor belt assembly four will fall onto the combined screen. If the amount of material in the corresponding granular material is too large, conveyor belt assembly three will move the material closer to the vibration structure, while conveyor belt assembly four will move the material away from the vibration structure. This avoids the situation where there is too much material of a certain size, and subsequent equipment cannot process it in time, resulting in excessive accumulation. 3. The vibrating structure drives the combined screen to vibrate, realizing secondary screening; for brittle materials such as coal, after the medium-sized particles are screened twice, the finest material is sent to the conveyor belt assembly three on the lower side of the adjustable screening module through the return material elevator, so that the material enters the combined screen on the upper side with the conveyor belt assembly two and the conveyor belt assembly three for screening, improving the screening accuracy. 4. If the combined screen becomes clogged, stop feeding and use the lifting and unlocking module to separate and vibrate the screen to clear the blockage. After clearing the blockage, reset the screen and continue operation to ensure continuous screening. Attached Figure Description

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

[0019] Figure 1 This is a perspective view of a continuous screening device according to the present invention; Figure 2 This is a front view of a continuous screening device according to the present invention; Figure 3 This is a left view of a continuous screening device according to the present invention; Figure 4 This is a perspective view of a continuous screening device of the present invention after the chassis obstruction has been removed; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the screen box and its connection structure; Figure 7 A schematic diagram of the fixed screen and its connection structure; Figure 8 for Figure 7 Enlarged view of point B in the middle; Figure 9 This is a schematic diagram of the lifting plate and its connecting structure; Figure 10 This is a schematic diagram of an electromagnet and its connection structure.

[0020] The labels in the diagram represent: 1. Adjustable coarse screening mechanism; 11. Chassis; 12. Conveyor belt assembly one; 121. Material distribution baffle; 13. Adjustable screening module one; 131. Hydraulic cylinder one; 132. Guide rail one; 133. Moving frame one; 134. Roller screen; 14. Adjustable screening module two; 2. Adjustable transfer mechanism; 21. Dual-channel discharge module; 211. Fixed inclined bucket; 212. Moving inclined baffle; 213. Collection hopper; 214. Discharge frame one; 215. Discharge frame two; 22. Conveyor belt assembly three; 23. Conveyor belt assembly four; 24. Side baffle; 3. Vibrating screening mechanism; 31. Vibrating... 311. Moving structure; 312. Support platform; 313. Spring 1; 314. Screen box; 32. Combined screen; 325. Fixed screen; 326. Moving screen; 327. Spring 2; 328. Guide rod; 329. Reinforcing plate; 320. Lifting module; 331. Mounting box; 332. Hydraulic cylinder 2; 333. Round rod; 334. Lifting plate; 335. Enclosure plate; 34. Locking module; 346. Fixing box; 347. Telescopic rod; 348. Spring 3; 349. Pad block; 340. Magnetic metal block; 341. Electromagnet; 4. Return material elevator. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] The terms "left," "right," "front," "back," "up," and "down" used in the following description refer to the orientation from the perspective of the front view.

[0023] Example 1: In some embodiments, please refer to the accompanying drawings. Figures 1-6 A continuous screening device includes a vibrating screening mechanism 3; and also includes an adjustable coarse screening mechanism 1. like Figure 2 and Figure 3 As shown, the adjustable coarse screening mechanism 1 includes a housing 11, a conveyor belt assembly 12, an adjustable screening module 13, and an adjustable screening module 14. The conveyor belt assembly 12, the adjustable screening module 13, and the adjustable screening module 14 are installed inside the housing 11. The conveyor belt assembly 12 and the two adjustable screening modules 13 are arranged in a stepped manner from back to front. An adjustable transfer mechanism 2 is distributed on the lower side of both the adjustable screening module 13 and the adjustable screening module 14. Two vibrating screening mechanisms 3 are located on both sides of the housing 11. like Figure 2 As shown, the adjustable transfer mechanism 2 includes a dual-channel discharge module 21, a conveyor belt assembly 3 22, and a conveyor belt assembly 4 23. The dual-channel discharge module 21 is mounted on the housing 11 and is located below the adjustable screening module 13 and the adjustable screening module 2 14. The conveyor belt assembly 3 22 and the conveyor belt assembly 4 23 are fixedly mounted on the housing 11 and are located below the dual-channel discharge module 21. The conveyor belt assembly 4 23 is located below the dual-channel discharge module 21 on the side away from the vibrating screening mechanism 3, and the feed end of the vibrating screening mechanism 3 is aligned with the discharge end of the conveyor belt assembly 3 22. The side of the housing 11 is provided with a return material elevator 4 for feeding the finest material screened by the front vibrating screening mechanism 3 to the rear conveyor belt assembly 23.

[0024] like Figure 2 and Figure 6 As shown, the vibrating screening mechanism 3 includes a vibrating structure 31, a combined screen 32, a lifting module 33, and a locking module 34. The combined screen 32 is installed on the vibrating structure 31. Multiple sets of lifting modules 33 are symmetrically installed on the vibrating structure 31 to combine the combined screen 32. Multiple sets of locking modules 34 are symmetrically installed on the vibrating structure 31 to lock the combined screen 32.

[0025] Side baffles 24 are fixedly installed on the sides of conveyor belt assembly 3 22 and conveyor belt assembly 4 23.

[0026] The material return elevator 4 is a belt conveyor, which is a commercially available and mature piece of equipment in this field.

[0027] In this embodiment, when the continuous screening equipment is working normally, the adjustable screening module 13 and adjustable screening module 2 14 are adjusted according to the particle size of the material to make the residence time of particles of different sizes on the adjustable screening module 13 and adjustable screening module 2 14 more reasonable. If there are many small particles, the adjustable screening module 13 is extended, increasing the overall length from the position where the material falls on the adjustable screening module 13 to the position where it leaves the adjustable screening module 13, thereby prolonging the residence time of the material on the adjustable screening module 13 to a certain extent, so that the small particles can be fully screened. If there are very few large particles, part of the adjustable screening module 2 14 can be retracted to the lower side of the adjustable screening module 13, so that the large particles fall to the middle of the adjustable screening module 2 14 and continue to be screened and conveyed, thereby reducing the residence time of the large particles on the adjustable screening module 2 14, thereby improving screening efficiency and reducing energy consumption. The material to be screened is fed onto the adjustable screening module 13 via the conveyor belt assembly 12. The material is then conveyed from the adjustable screening module 13 to the adjustable screening module 24. During this process, small particles fall through the gaps in the adjustable screening module 13 into the lower dual-channel discharge module 21, while medium particles fall through the gaps in the adjustable screening module 24 into the lower dual-channel discharge module 21. The material falling under the adjustable screening module 13 and adjustable screening module 24 passes through the dual-channel discharge module 21 and falls onto the conveyor belt assembly 32 and conveyor belt assembly 423 respectively. If the amount of material corresponding to the particles matches the screening speed of the vibration structure 31 and the combined screen 32, then both the conveyor belt assembly 32 and the conveyor belt assembly 423 will drive the material to move towards the vibration structure 31, so that the material falling from the dual-channel discharge module 21 onto the conveyor belt assembly 423 and the conveyor belt assembly 32 will fall onto the combined screen 32. If the amount of material corresponding to the particles is too large, the conveyor belt assembly 32 will drive the material towards the vibrating structure 31, and the conveyor belt assembly 423 will drive the material away from the vibrating structure 31. In this way, the material falling from the dual-channel discharge module 21 onto the conveyor belt assembly 32 and the conveyor belt assembly 423 will be conveyed separately. Some of the material will be fed to the vibrating structure 31 and the combined screen 32 for subsequent screening, while some of the material will be conveyed to the rear accumulation area through the conveyor belt assembly 423 or conveyed or screened by external equipment. This avoids the situation where there is too much material of a certain size and the subsequent equipment cannot process it in time, resulting in excessive accumulation. Meanwhile, for brittle materials such as coal, secondary crushing may occur during screening and transfer. Therefore, the medium-sized particles that pass through the adjustable screening module 2 14 are conveyed to the vibrating structure 31 and the combined screen 32 for screening via the dual-channel discharge module 21, conveyor belt assembly 3 22 and conveyor belt assembly 4 23 below it. The finest material obtained from screening is then conveyed to the conveyor belt assembly 4 23 below the adjustable screening module 1 13 via the return material elevator 4, thereby improving the fineness of screening. After the material falls onto the combined screen 32 on the vibrating structure 31, the vibrating structure 31 drives the material to vibrate through the combined screen 32, causing the material to fall sequentially according to particle size, thus achieving secondary screening of the material. During this process, if the combined screen 32 becomes clogged, the conveyor belt assembly 23 and the conveyor belt assembly 22 are paused, thereby stopping the feeding. Then, the combined screen 32 is lifted by the lifting module 33, and then the combined screen 32 is unlocked by the locking module 34, allowing the combined screen 32 to separate. The vibrating structure is then activated. 31 drives the combined screen 32 to vibrate and accelerate separation. After the combined screen 32 separates, the stuck material is released from the combined screen 32. After clearing the blockage, the lifting module 33 drives the combined screen 32 to assemble, so that the locking module 34 locks the combined screen 32. Then the lifting module 33 resets, and the screening operation is carried out again. This achieves rapid cleaning of the combined screen 32. During this process, it is not necessary to stop the adjustable screening module 13 and the adjustable screening module 2 14, thus ensuring the continuity of screening and improving the overall screening efficiency.

[0028] Example 2: In some embodiments, as a preferred embodiment of the present invention, such as... Figure 4 As shown, the adjustable screening module 13 includes a hydraulic cylinder 131, a guide rail 132, a movable frame 133, and a roller screen 134. The guide rail 132 is symmetrically and fixedly installed inside the housing 11, and the movable frame 133 is slidably connected to the guide rail 132 on both sides. The roller screen 134 is fixedly installed on the movable frame 133. The hydraulic cylinder 131 is symmetrically and fixedly installed inside the housing 11, and the output end of the hydraulic cylinder 131 is fixedly connected to the movable frame 133. A material distribution baffle 121 is fixedly installed inside the housing 11 on the upper side of the conveyor belt assembly 12; The structure of the second adjustable screening module 14 is the same as that of the first adjustable screening module 13; the spacing between the screening rollers of the second adjustable screening module 14 is greater than the spacing between the screening rollers of the first adjustable screening module 13.

[0029] like Figure 5As shown, the dual-channel discharge module 21 includes a fixed inclined hopper 211, a movable inclined baffle 212, a collection hopper 213, a discharge frame one 214, and a discharge frame two 215. A fixed inclined hopper 211 is fixedly installed inside the housing 11 on the lower side of the movable frame one 133 and the adjustable screening module two 14, respectively. Movable inclined baffles 212 are fixedly installed on the front side of the adjustable screening module two 14 and the movable frame one 133, respectively. The movable inclined baffles 212 are inserted into the fixed inclined hopper 211 from the front side. Two collection hoppers 213 are fixedly installed on the lower side of each fixed inclined hopper 211. A discharge frame one 214 is fixedly installed on the lower side of one collection hopper 213, and a discharge frame two 215 is fixedly installed on the lower side of the other collection hopper 213. The discharge frame 1 214 is located on the upper side of the conveyor belt assembly 3 22, and the discharge frame 215 is located on the upper side of the conveyor belt assembly 4 23; the distance between the bottom of the discharge frame 1 214 and the upper surface of the conveyor belt assembly 3 22 is greater than the distance between the bottom of the discharge frame 215 and the upper surface of the conveyor belt assembly 4 23.

[0030] like Figures 6-10 As shown, the vibration structure 31 includes a support platform 311, springs 312, and a screen box 313. The screen box 313 is located on the upper side of the support platform 311, and multiple springs 312 are symmetrically distributed between the screen box 313 and the support platform 311. One end of each spring 312 is fixedly connected to the support platform 311, and the other end of each spring 312 is fixedly connected to the screen box 313. A vibrator driven by a motor is fixedly installed on the screen box 313. The combined screen 32 includes a fixed screen 321, a movable screen frame 322, a movable screen 323, a second spring 324, guide rods 325, and a reinforcing plate 326. The fixed screen 321 is fixedly installed on the screen box 313. The movable screen frame 322 is located below the fixed screen 321, and the movable screen 323 is fixedly installed on the movable screen frame 322. Multiple guide rods 325 are symmetrically fixedly installed on the screen box 313. The movable screen frame 322 and the guide rods 325 are slidably connected. The guide rods 325 are fitted with a second spring 324. One end of the second spring 324 is fixedly connected to the movable screen frame 322, and the other end of the second spring 324 is fixedly connected to the screen box 313. A reinforcing plate 326 for supporting the movable screen 323 is fixedly installed on the lower side of the movable screen frame 322. The filter holes on the movable screen 323 and the fixed screen 321 are staggered. The filter hole sizes on the fixed screen 321 and the movable screen 323 are different. The filter hole size at the feed end of the fixed screen 321 and the movable screen 323 is smaller than the filter hole size at the discharge end. Multiple screening hoppers are fixedly installed at the bottom of the screen box 313, and each screening hopper is aligned with a filter hole of a different size. The feed end of the return material elevator 4 is located at the bottom of the screen box 313, near the lower side of the screening receiving hopper. The lifting module 33 includes a mounting box 331, a second hydraulic cylinder 332, a round rod 333, a lifting plate 334, and a surrounding plate 335. The mounting box 331 is fixedly mounted on the support platform 311. The second hydraulic cylinder 332 is fixedly mounted inside the mounting box 331. The lifting plate 334 for lifting the movable screen frame 322 is fixedly mounted at the output end of the second hydraulic cylinder 332. The round rods 333 are symmetrically fixedly mounted on the lower side of the lifting plate 334 and are inserted into the mounting box 331. The surrounding plate 335 is fixedly mounted on the lower side of the lifting plate 334. The screen box 313 is provided with a clearance groove to facilitate the movement of the lifting plate 334 and the surrounding plate 335. The locking module 34 includes a fixed box 341, a telescopic rod 342, a spring 343, a pad 344, and an unlocking component. The fixed box 341 is fixedly installed on the screen box 313. A pad 344 for supporting the movable screen frame 322 is inserted into the inner side of the fixed box 341. Multiple sets of telescopic rods 342 are distributed between the pad 344 and the fixed box 341. One end of the telescopic rod 342 is fixedly connected to the fixed box 341, and the other end of the telescopic rod 342 is fixedly connected to the pad 344. A spring 343 is sleeved on the outer side of the telescopic rod 342. One end of the spring 343 is fixedly connected to the fixed box 341, and the other end of the spring 343 is fixedly connected to the pad 344. An unlocking component is installed on the fixed box 341 and the pad 344. The unlocking components include a magnetic metal block 345 and an electromagnet 346. The magnetic metal block 345 is symmetrically fixed inside the pad 344, and the electromagnet 346 for attracting the magnetic metal block 345 is symmetrically fixed on the fixing box 341.

[0031] In this embodiment, when the adjustable coarse screening mechanism 1, the adjustable transfer mechanism 2, the vibrating screening mechanism 3, and the return material elevator 4 are working normally, the hydraulic cylinder 131 drives the moving frame 133 and the roller screen 134 to move under the limiting action of the guide rail 132, so that the moving frame 133 and the roller screen 134 move under the conveyor belt assembly 12, thereby changing the position of the material conveyed by the conveyor belt assembly 12 falling onto the roller screen 134; changing the length of the material moving on the roller screen 134, thereby changing the residence time of the material on the roller screen 134; adjusting the adjustable screening module 2 14 according to the same operation, so that the residence time of particles of different sizes on the adjustable screening module 13 and the adjustable screening module 2 14 is more reasonable; The material to be screened is fed onto the roller screen 134 via conveyor belt assembly 12. The material is then conveyed through the roller screen 134 to the adjustable screening module 14. During this process, small particles fall through the gaps in the roller screen 134 into the lower fixed inclined hopper 211, and medium-sized particles fall through the gaps in the adjustable screening module 14 into the lower fixed inclined hopper 211. Through the cooperation of the movable inclined baffle 212 and the fixed inclined hopper 211, the material screened on the upper side of the roller screen 134 falls into both the fixed inclined hopper 211 and the movable inclined baffle 212 during the movement of the roller screen 134. The material in the baffle 212 passes through the two collection hoppers 213 and falls onto the conveyor belt assembly 22 through the discharge frame 1 214 and onto the conveyor belt assembly 23 through the discharge frame 215. If the amount of material of the corresponding particles matches the screening speed of the screen box 313 and the fixed screen 321, the conveyor belt assembly 22 and the conveyor belt assembly 23 will both drive the material to move closer to the screen box 313, so that the material falling onto the conveyor belt assembly 23 and the conveyor belt assembly 22 through the discharge frame 1 214 and the discharge frame 215 will fall onto the fixed screen 321. If the amount of material corresponding to the particles is greater than the screening capacity of the combined screen 32, then the conveyor belt assembly 32 will drive the material towards the screen box 313, and the conveyor belt assembly 423 will transport the material away from the screen box 313. Thus, the material falling from the dual-channel discharge module 21 onto the conveyor belt assembly 322 and the conveyor belt assembly 423 will be transported separately, so that some of the material is fed onto the fixed screen 321 for subsequent screening, and some of the material is transported to the rear accumulation area through the conveyor belt assembly 423 or transported or screened by external equipment. For brittle materials such as coal, secondary crushing may occur during screening and transfer. Therefore, the medium-sized particles that pass through the adjustable screening module 2 14 are conveyed to the fixed screen 321 for screening through the fixed inclined bucket 211, the collecting bucket 213, the discharge frame 1 214, the discharge frame 2 215, the conveyor belt assembly 3 22 and the conveyor belt assembly 4 23 below it. The finest material obtained by screening is then conveyed to the conveyor belt assembly 4 23 below the roller screen 134 through the return material elevator 4. In the initial state, the pad 344 is placed under the movable screen frame 322 to support it, causing the movable screen 323 and the fixed screen 321 on the movable screen frame 322 to be misaligned and fitted together to form screen holes, and the spring 324 is in a compressed state. After the material falls onto the fixed screen 321, the vibrator drives the fixed screen 321, the movable screen frame 322, and the movable screen 323 to vibrate through the screen box 313, thereby causing the material to vibrate. The combination of the fixed screen 321 and the movable screen 323 forms screen holes, allowing the material to fall in order according to particle size. During this process, if the material gets stuck on the fixed screen... Within the screen 321 and the movable screen 323, the conveyor belt assembly 23 and the conveyor belt assembly 22 are paused, thus stopping the feeding. Then, the lifting plate 334 and the surrounding plate 335 are driven by the hydraulic cylinder 332 to move vertically under the limiting action of the hydraulic cylinder 332. After passing through the clearance groove on the screen box 313, the movable screen frame 322 is lifted. Then, the electromagnet 346 is activated, and the electromagnet 346 attracts the magnetic metal block 345, thereby causing the magnetic metal block 345 to drive the pad block 344 to move horizontally under the limiting action of the telescopic rod 342, so that the pad block 344 is disengaged from the lower side of the movable screen frame 322, and the spring 343 is compressed. Hydraulic cylinder 332 drives the round rod 333, lifting plate 334, and surrounding plate 335 to reset; at this time, the reset force of spring 324 and the gravity of the moving screen frame 322 drive the moving screen frame 322 and the moving screen 323 to move vertically downward, causing the moving screen 323 and the fixed screen 321 to separate; the moving screen 323 and the fixed screen 321 are staggered, and the combined screen hole size is smaller than their individual sizes. After the moving screen 323 and the fixed screen 321 separate, the material that was originally stuck passes through the screen holes of the moving screen 323 and the fixed screen 321 in sequence; thus completing the unblocking. Then, hydraulic cylinder 332 drives the lifting plate 334 and the surrounding plate 335 to move vertically, raising the movable screen frame 322, so that the movable screen 323 on the movable screen frame 322 is recombined with the fixed screen 321; the electromagnet 346 is de-energized and no longer attracts the magnetic metal block 345, the spring 343 resets and drives the pad 344 to move, so that the pad 344 moves to the underside of the movable screen frame 322 to support the movable screen frame 322; then hydraulic cylinder 332 drives the lifting plate 334 and the surrounding plate 335 to reset.

[0032] Example 3: In some embodiments, such as Figures 1-10 As shown, in a preferred embodiment of the present invention, a continuous screening method for coal mines includes the following steps: Step 1: Adjust the regulating screening module 13 and regulating screening module 2 14 according to the particle size of the material to change the residence time of the material on the regulating screening module 13 and regulating screening module 2 14. Step 2: The material to be screened is fed onto the adjustable screening module 13 via the conveyor belt assembly 12. The material is then conveyed from the adjustable screening module 13 to the adjustable screening module 24. During this process, small particles fall through the gaps in the adjustable screening module 13 into the lower dual-channel discharge module 21, while medium particles fall through the gaps in the adjustable screening module 24 into the lower dual-channel discharge module 21. Step 3: The screened material falls onto conveyor belt assembly 32 and conveyor belt assembly 43 respectively after passing through the dual-channel discharge module 21. If the amount of material corresponding to the particles matches the screening speed of the vibration structure 31 and the combined screen 32, both conveyor belt assembly 32 and conveyor belt assembly 43 will move the material closer to the vibration structure 31. If the amount of material corresponding to the particles is greater than the screening capacity of the combined screen 32, then conveyor belt assembly 32 will move the material closer to the vibration structure 31, and conveyor belt assembly 43 will move the material away from the vibration structure 31. Step 4: The material is screened a second time by the vibrating structure 31 and the combined screen 32; at the same time, the medium-sized particles that have passed through the adjustable screening module 2 14 are conveyed to the vibrating structure 31 and the combined screen 32 by the dual-channel discharge module 21, the conveyor belt assembly 3 22 and the conveyor belt assembly 4 23 below it for screening. The finest material obtained by screening is then conveyed to the conveyor belt assembly 4 23 below the adjustable screening module 1 13 by the return material elevator 4.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A continuous screening device, comprising a vibrating screening mechanism (3), characterized in that: It also includes an adjustable coarse screening mechanism (1); The adjustable coarse screening mechanism (1) includes a housing (11), a conveyor belt assembly (12), an adjustable screening module (13), and an adjustable screening module (14). The conveyor belt assembly (12), the adjustable screening module (13), and the adjustable screening module (14) are installed inside the housing (11). The conveyor belt assembly (12) and the two adjustable screening modules (13) are arranged in a stepped manner from back to front. An adjustable transfer mechanism (2) is distributed on the lower side of both the adjustable screening module (13) and the adjustable screening module (14). Two vibrating screening mechanisms (3) are located on both sides of the housing (11). The adjustable transfer mechanism (2) includes a dual-channel discharge module (21), a conveyor belt assembly three (22), and a conveyor belt assembly four (23). The dual-channel discharge module (21) is installed on the chassis (11) and is located below the adjustable screening module one (13) and the adjustable screening module two (14). The conveyor belt assembly three (22) and the conveyor belt assembly four (23) are fixedly installed on the chassis (11) and are located below the dual-channel discharge module (21). The conveyor belt assembly four (23) is located below the dual-channel discharge module (21) and away from the vibrating screening mechanism (3). The feed end of the vibrating screening mechanism (3) is aligned with the discharge end of the conveyor belt assembly three (22). The side of the housing (11) is provided with a return material elevator (4) for feeding the finest material screened by the front vibrating screening mechanism (3) to the rear conveyor belt assembly four (23).

2. The continuous screening device according to claim 1, characterized in that, The vibrating screening mechanism (3) includes a vibrating structure (31), a combined screen (32), a lifting module (33), and a locking module (34). The combined screen (32) is installed on the vibrating structure (31). Multiple lifting modules (33) for combining the combined screen (32) are symmetrically installed on the vibrating structure (31). Multiple locking modules (34) for locking the combined screen (32) are symmetrically installed on the vibrating structure (31).

3. The continuous screening device according to claim 2, characterized in that, The adjustable screening module 1 (13) includes a hydraulic cylinder 1 (131), a guide rail 1 (132), a movable frame 1 (133), and a roller screen (134). The guide rail 1 (132) is symmetrically fixedly installed inside the machine box (11), and the movable frame 1 (133) is limited and slidably connected to the guide rail 1 (132) on both sides. The roller screen (134) is fixedly installed on the movable frame 1 (133). The hydraulic cylinder 1 (131) is symmetrically fixedly installed inside the machine box (11), and the output end of the hydraulic cylinder 1 (131) is fixedly connected to the movable frame 1 (133).

4. The continuous screening device according to claim 3, characterized in that, The dual-channel discharge module (21) includes a fixed inclined bucket (211), a movable inclined baffle (212), a collection hopper (213), a discharge frame one (214), and a discharge frame two (215). A fixed inclined bucket (211) is fixedly installed in the machine box (11) on the lower side of the movable frame one (133) and the adjustable screening module two (14). A movable inclined baffle (212) is fixedly installed on the front side of the adjustable screening module two (14) and the movable frame one (133). The movable inclined baffle (212) is inserted into the fixed inclined bucket (211) from the front side. Two collection hoppers (213) are fixedly installed on the lower side of each fixed inclined bucket (211). A discharge frame one (214) is fixedly installed on the lower side of one collection hopper (213), and a discharge frame two (215) is fixedly installed on the lower side of the other collection hopper (213).

5. The continuous screening device according to claim 4, characterized in that, The discharge frame 1 (214) is located on the upper side of the conveyor belt assembly 3 (22), and the discharge frame 2 (215) is located on the upper side of the conveyor belt assembly 4 (23); the distance between the bottom of the discharge frame 1 (214) and the upper surface of the conveyor belt assembly 3 (22) is greater than the distance between the bottom of the discharge frame 2 (215) and the upper surface of the conveyor belt assembly 4 (23).

6. The continuous screening device according to claim 5, characterized in that, The vibration structure (31) includes a support platform (311), springs (312) and a screen box (313). The screen box (313) is located on the upper side of the support platform (311). Multiple springs (312) are symmetrically distributed between the screen box (313) and the support platform (311). One end of the spring (312) is fixedly connected to the support platform (311), and the other end of the spring (312) is fixedly connected to the screen box (313). A vibrator driven by a motor is fixedly installed on the screen box (313).

7. The continuous screening device according to claim 6, characterized in that, The combined screen (32) includes a fixed screen (321), a movable screen frame (322), a movable screen (323), a second spring (324), a guide rod (325), and a reinforcing plate (326). The fixed screen (321) is fixedly installed on the screen box (313). The movable screen frame (322) is located below the fixed screen (321), and the movable screen (323) is fixedly installed on the movable screen frame (322). Multiple guide rods (325) are symmetrically fixedly installed on the screen box (313). The movable screen frame (322) and the guide rods (325) are connected in a limited sliding connection. The guide rods (325) are covered with a second spring (324). One end of the second spring (324) is fixedly connected to the movable screen frame (322), and the other end of the second spring (324) is fixedly connected to the screen box (313). A reinforcing plate (326) for supporting the movable screen (323) is fixedly installed on the lower side of the movable screen frame (322).

8. The continuous screening device according to claim 7, characterized in that, The locking module (34) includes a fixed box (341), a telescopic rod (342), a spring (343), a pad (344), and an unlocking component. The fixed box (341) is fixedly installed on the screen box (313). A pad (344) for supporting the movable screen frame (322) is inserted into the inside of the fixed box (341). Multiple sets of telescopic rods (342) are distributed between the pad (344) and the fixed box (341). One end of the telescopic rod (342) is fixedly connected to the fixed box (341), and the other end of the telescopic rod (342) is fixedly connected to the pad (344). A spring (343) is sleeved on the outside of the telescopic rod (342). One end of the spring (343) is fixedly connected to the fixed box (341), and the other end of the spring (343) is fixedly connected to the pad (344). An unlocking component is installed on the fixed box (341) and the pad (344).

9. The continuous screening device according to claim 8, characterized in that, The unlocking components include a magnetic metal block (345) and an electromagnet (346). The magnetic metal block (345) is symmetrically fixed inside the pad (344), and the electromagnet (346) for attracting the magnetic metal block (345) is symmetrically fixed on the fixing box (341).

10. A continuous screening method for coal mines, utilizing the continuous screening equipment as described in claim 9, characterized in that, Includes the following steps: Step 1: Adjust the regulating screening module 1 (13) and regulating screening module 2 (14) according to the particle size of the material to change the residence time of the material on the regulating screening module 1 (13) and regulating screening module 2 (14); Step 2: The material to be screened is fed onto the adjustable screening module 1 (13) via the conveyor belt assembly 1 (12). The material is then conveyed and screened by the adjustable screening module 1 (13) to the adjustable screening module 2 (14). Step 3: The screened material falls onto conveyor belt assembly three (22) and conveyor belt assembly four (23) respectively after passing through the dual-channel discharge module (21); if the amount of material of the corresponding particle matches the screening speed of the vibration structure (31) and the combined screen (32), then both conveyor belt assembly three (22) and conveyor belt assembly four (23) will drive the material to move closer to the vibration structure (31); if the amount of material of the corresponding particle is greater than the screening capacity of the combined screen (32), then conveyor belt assembly three (22) will drive the material to move closer to the vibration structure (31), and conveyor belt assembly four (23) will move the material away from the vibration structure (31); Step 4: The material is screened a second time by the vibrating structure (31) and the combined screen (32); at the same time, the medium-sized particles that have passed through the adjustable screening module 2 (14) are transported to the vibrating structure (31) and the combined screen (32) by the dual-channel discharge module (21), the conveyor belt assembly 3 (22) and the conveyor belt assembly 4 (23) below it for screening. The finest material obtained by screening is then transported to the conveyor belt assembly 4 (23) below the adjustable screening module 1 (13) by the return material elevator (4).

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