Crushing and screening device

Abstract

The invention discloses a crushing and screening device which comprises a feeding system which comprises a feeding bin, a grating net, a closed type vibrating feeder, a variable frequency motor and a crankshaft. A magnetic separation system; the tooth roller crushing system comprises a first tooth roller and a second tooth roller which move oppositely, the first tooth roller and the second tooth roller are provided with a plurality of tooth structures and grooves, and eagle-beak-shaped hook parts are arranged at the ends of the tooth structures; the metering system comprises a weighing sensor; the instrument signal collection and remote transmission system comprises a pressure detector; and the control system is in communication connection with the feeding system, the tooth roller crushing system, the metering system and the instrument signal collection and remote transmission system. The olecranon-shaped hook parts are arranged on the tooth structures, so that materials can be effectively crushed, the problem that a feeding port is blocked or the materials are blocked due to the fact that the sizes of the materials are not uniform or lamellar materials are doped in the middle is solved, and the materials larger than or equal to 150 mm automatically roll to a loading area of a loading area by arranging the crankshaft swinging in a reciprocating mode.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, and in particular to a lignite crushing and screening device. Background Technology

[0002] In the field of lignite crushing and processing, traditional small toothed roller crushing and screening devices have significant technical defects due to insufficient adaptability. The size distribution of lignite raw materials is extremely uneven, and they are mixed with a large amount of sheet materials with large aspect ratio and strong flexibility. When these materials enter the straight cylindrical feed inlet, they are easy to overlap and entangle with large particles, forming a bridging phenomenon at the toothed roller feed end, which in turn causes frequent material jamming at the feed inlet.

[0003] Material jamming not only leads to uneven distribution of material entering the crushing chamber, significantly reducing the uniformity of the particle size of the crushed product, but also requires frequent shutdowns for manual cleaning, severely disrupting the continuous operation rhythm of the production line and resulting in low actual operating efficiency of the equipment. At the same time, the cleaning process is prone to secondary failures such as toothed roller breakage and motor overload, significantly increasing maintenance costs and failing to meet the needs of efficient and stable industrial processing of lignite.

[0004] Therefore, improvements to existing technologies are needed. Summary of the Invention

[0005] The main objective of this invention is to provide a lignite crushing and screening device. By setting an eagle-beak-shaped hook on the toothed structure, the material can be effectively crushed, solving the problem of the feed inlet being blocked or jammed due to uneven material size or the presence of interstitial flaky material. By setting a reciprocating crankshaft, materials ≥150mm roll down to the loading area, and the ferrous material is separated by a magnetic separation system, ensuring that no sparks are generated during the toothed roller crushing operation.

[0006] According to one aspect of the present invention, a lignite crushing and screening device is provided, comprising: The feeding system includes a feeding hopper, the feeding port of which is covered with an inclined grid for screening materials. A closed vibrating feeder is installed on the conveying pipe at the bottom of the feeding hopper. A crankshaft and a variable frequency motor for driving the crankshaft to reciprocate are installed on the side plate of the closed vibrating feeder. A magnetic separation system, comprising a permanent magnet device and / or an electromagnetic device disposed on the outer wall of the conveying pipe; The toothed roller crushing system includes a first toothed roller and a second toothed roller that move in opposite directions. The first toothed roller and the second toothed roller are provided with multiple tooth structures and grooves along the circumference. The tooth structures are arranged to correspond to the grooves on the other toothed roller. The ends of the tooth structures are provided with beak-shaped hooks. The feed inlet of the toothed roller crushing system is located directly below the outlet of the conveying pipe. The metering system includes a weighing sensor installed at the bottom discharge port of the toothed roller crushing system; The instrument signal collection and remote transmission system includes a pressure detector that acquires and transmits the pressure within the fine filter in real time; and... The control system is connected to the feeding system, magnetic separation system, toothed roller crushing system, metering system, and instrument signal collection and remote transmission system.

[0007] According to one embodiment of the present invention, a spring clamping assembly is provided on the side of the second toothed roller, the spring clamping assembly being used to press the second toothed roller inward or release it outward to reduce or increase the distance between the first toothed roller and the second toothed roller.

[0008] According to one embodiment of the present invention, the extension direction of the hook portion is toward the movement direction of the first or second toothed roller in which it is located, and the connection of the hook portion is a smooth transition.

[0009] According to one embodiment of the present invention, the first toothed roller and the second toothed roller are staggered in a direction parallel to their axial direction, and the tooth structure of the first toothed roller and the second toothed roller has an overlapping portion at the center.

[0010] According to one embodiment of the present invention, a drive motor is provided on one side of the first toothed roller, and the drive motor is used to drive the first toothed roller and the second toothed roller to perform circumferential motion.

[0011] According to one embodiment of the present invention, the enclosed vibrating feeder is suspended at the bottom of the conveying pipe, the height of the feed box of the enclosed vibrating feeder is 350~450mm, and the discharge capacity is 150~250t / h.

[0012] According to one embodiment of the present invention, the length of the tooth structure is 50-70 mm, and the number of teeth in the circumferential direction is 40-50.

[0013] According to one embodiment of the present invention, the diameter of the first toothed roller and the second toothed roller is 500~700mm and the length is 700~900mm.

[0014] According to one embodiment of the present invention, the distance between the first toothed roller and the second toothed roller can be adjusted to 0~100mm.

[0015] According to one embodiment of the present invention, the net spacing of the grid mesh is ≤150mm.

[0016] In a lignite crushing and screening device according to an embodiment of the present invention, the material can be effectively crushed by setting an eagle-beak-shaped hook and groove on the tooth structure, which solves the problem of the feed inlet being blocked or jammed due to uneven material size or intermingling of flaky material. By setting a reciprocating crankshaft, the material ≥150mm rolls down to the loading area, and the ferrous material is separated by the magnetic separation system, ensuring that no sparks are generated during the toothed roller crushing operation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some implementation examples of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a lignite crushing and screening device according to an exemplary embodiment of the present invention is shown; Figure 2 A partial schematic diagram of a crushing and screening device according to an exemplary embodiment of the present invention is shown; Figure 3 A top view of a crushing and screening apparatus according to an exemplary embodiment of the present invention is shown; Figure 4 A schematic diagram of a grid screen for a crushing and screening device according to an exemplary embodiment of the present invention is shown; Figure 5 A schematic diagram of a toothed roller of a crushing and screening device according to an exemplary embodiment of the present invention is shown; Figure 6 A schematic diagram of the X-axis and Y-axis of the roller gap of a crushing and screening device according to an exemplary embodiment of the present invention is shown.

[0019] The reference numerals in the figure are explained as follows: 1. Feed hopper; 2. Grating; 3. Conveying pipe; 4. Enclosed vibrating feeder; 5. First toothed roller; 6. Second toothed roller; 7. Tooth structure; 8. Groove; 9. Hook section; 10. Spring clamping assembly; 11. Drive motor. Detailed Implementation

[0020] The following detailed description of the embodiments is intended to exemplify the principles of the present invention, but should not be construed as limiting the scope of the invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0021] These embodiments are provided to make this disclosure thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0022] It should be noted that, in the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] It should also be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0024] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0025] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0026] like Figure 1-3As shown, this invention proposes a lignite crushing and screening device, comprising: a feeding system including a feeding bin 1, the feeding inlet of the feeding bin 1 being covered with an inclined grid 2 for screening materials, a closed vibrating feeder 4 being installed on a conveying pipe 3 at the bottom of the feeding bin 1, and a crankshaft and a variable frequency motor for driving the crankshaft to reciprocate on the side plate of the closed vibrating feeder 4; a magnetic separation system including a permanent magnet device and / or an electromagnetic device installed on the outer wall of the conveying pipe 3; and a toothed roller crushing system including a first toothed roller 5 and a second toothed roller 6 moving in opposite directions, the first toothed roller 5 and the second toothed roller 6 being arranged circumferentially... The system includes multiple toothed structures 7 and grooves 8, with each toothed structure 7 corresponding to a groove 8 on another toothed roller. The ends of the toothed structures 7 are provided with beak-shaped hooks 9. The feed inlet of the toothed roller crushing system is located directly below the outlet of the conveying pipe 3. The system also includes a metering system, which includes a weighing sensor located at the bottom outlet of the toothed roller crushing system; an instrument signal collection and remote transmission system, which includes a pressure detector that acquires and transmits the pressure inside the fine filter in real time; and a control system, which is communicatively connected to the feeding system, magnetic separation system, toothed roller crushing system, metering system, and instrument signal collection and remote transmission system.

[0027] In the lignite crushing and screening device according to an embodiment of the present invention, the feed bin 1 with a grid 2 and the toothed roller crushing system are the main structures of the device. By setting the beak-shaped hook part 9 on the toothed structure 7, the material can be effectively crushed, which solves the problem of the feed inlet being blocked or jammed due to uneven material size or the presence of interstitial flaky material. By setting the reciprocating crankshaft, the material ≥150mm rolls down to the loading area, and the ferrous material is separated by the magnetic separation system, ensuring that no sparks are generated during the toothed roller crushing operation.

[0028] like Figure 4 As shown, the surface of the grid mesh 2 in this invention is provided with a uniform mesh. In some specific embodiments, the mesh size is set to 170×170mm according to specific needs, and the net spacing of the grid mesh 2 is ≤150mm. This allows for preliminary selection of materials, ensuring that materials with a size ≥150mm roll down to the loading area, effectively filtering large-sized materials and preventing them from entering the crushing system, thus preventing blockage and ensuring the continuity and stability of operation. When materials pass through the grid mesh 2, they are also dispersed and homogenized, reducing direct impact and wear on the device, lowering maintenance costs, and increasing the service life of the crushing device. Preferably, the grid mesh 2 is welded from 20# round steel. The grid mesh 2 forms a 45° angle with the horizontal plane, and the variable frequency motor drives the crankshaft to reciprocate, facilitating the rolling down of materials ≥150mm to the loading area.

[0029] Before entering the toothed roller crushing system, lignite undergoes a magnetic separation system. This system includes permanent magnet devices and / or electromagnetic devices mounted on the outer wall of the conveying pipe 3. These devices separate iron-containing materials from the lignite, which are then adsorbed onto the inner wall of the conveying pipe 3 and prevented from entering the toothed rollers for crushing. This ensures that no iron enters during the toothed roller crushing process, avoiding spark generation and guaranteeing the safety of the high-speed lignite crushing operation. The magnetic separation system is positioned relative to the outer wall of the conveying pipe 3. The permanent magnet devices include a permanent magnet drum and a suspended permanent magnet separator, while the electromagnetic devices include an electromagnetic drum and an electromagnetic separator.

[0030] The magnetic field strength of the magnetic separation system is ≥6000Gs.

[0031] Before entering the toothed roller crusher, the lignite is separated from the iron materials mixed in by the magnetic separation system, ensuring that no sparks are generated during the toothed roller crushing operation and ensuring the safety of the high-speed crushing operation of lignite. The magnetic field strength (Gs) of the magnetic separation system is ≥6000Gs (magnetic field strength ≥1500Gs at a height of 50mm from the roller surface), and the magnetic force decay is no more than 3% over 10 years. The magnetic core is adjustable, and the magnetic system and the main shaft connecting plate are made of non-magnetic stainless steel to ensure that there is no leakage magnetic conduction to the main shaft, thereby ensuring the clean and stable operation of the bearing.

[0032] In some embodiments, the toothed rollers and toothed pins are made of high-chromium cast iron. High-chromium cast iron has excellent wear resistance and can maintain stable hardness and mechanical properties at high temperatures. It is not easy to soften or deform and has high toughness and fracture resistance. It can effectively prevent accidental breakage of the toothed rollers and toothed pins during operation, thereby improving the safety and stability of the device.

[0033] The first toothed roller 5 and the second toothed roller 6 move towards each other. The toothed roller 5 is closer to the feed hopper 1, and the toothed roller 6 is farther away from the feed hopper 1. Both the first toothed roller 5 and the second toothed roller 6 have multiple tooth structures 7 and grooves 8 arranged circumferentially. The tooth structures 7 correspond to the grooves 8 on the other toothed roller; that is, the tooth structures 7 of the first toothed roller 5 correspond to the grooves 8 of the second toothed roller 6, and vice versa. The cooperation of the tooth structures 7 and the grooves 8 causes the opposing rollers to apply strong extrusion and friction forces to the material through relative rotation, thereby achieving rapid and efficient crushing of the material. This crushing method can quickly crush materials to the required particle size, improving crushing efficiency.

[0034] In some specific embodiments, a spring-pressing assembly is provided on the side of the second toothed roller 6. This assembly is used to press the second toothed roller 6 inwards or release it outwards to decrease or increase the distance between the first toothed roller 5 and the second toothed roller 6. Because the design of the spring-pressing assembly allows for adjustment of the gap between the opposing rollers, the particle size of the crushed material can be controlled as needed, resulting in a more uniform particle size, which is beneficial for subsequent processing and utilization. The spring-pressing assembly can precisely control the distance between the toothed rollers by adjusting the spring compression. This adjustment method makes adjusting the toothed roller spacing more convenient and accurate, helping to meet the needs of crushing or processing different materials.

[0035] like Figure 5-6 As shown, the gap adjustment has two directions, X and Y. The X direction is used to adjust the horizontal relative distance between the two toothed rollers. It is mainly used to adjust the feeding direction according to the particle size and shape of the incoming material to ensure that the material will not get stuck or float above the toothed rollers. The Y direction is mainly used to adjust the lateral relative gap between the two "V" shaped grooves according to the wear of the toothed rollers to ensure the relative consistency of the material particle size.

[0036] Based on the above embodiments, the extension direction of the hook is towards the movement direction of the first toothed roller 5 or the second toothed roller 6 to which it is located. The connection between the hook portion 9 and the tooth structure 7 is a smooth transition, that is, the hook portion 9 extends smoothly from the tooth structure 7. When the extension direction of the hook portion 9 is towards the movement direction of the first toothed roller 5 or the second toothed roller 6 to which it is located, the contact between the teeth is more direct and stable, thereby reducing energy loss during transmission and improving the overall transmission efficiency. The transmission method in which the extension direction of the hook portion 9 is towards the movement direction of the first toothed roller 5 and the second toothed roller 6 can ensure the precise movement and positioning of the equipment. The smooth transition at the connection of the hook portion 9 also reduces vibration and impact caused by discontinuity at the connection, thereby helping to maintain the smoothness of transmission, especially under high-speed or high-load conditions, it can significantly reduce transmission instability caused by vibration.

[0037] In some specific embodiments, the first toothed roller 5 and the second toothed roller 6 are staggered in a direction parallel to their axial direction (e.g., front-to-back direction), and the tooth structures 7 of the first toothed roller 5 and the second toothed roller 6 have overlapping portions at the center. The staggered arrangement of the two toothed rollers allows the material to be subjected to stronger shearing and compression forces as it passes through, increasing the relative movement between the teeth, thereby improving crushing efficiency. It also allows the material to be subjected to more uniform crushing force during the crushing process, contributing to a more efficient crushing effect. Preferably, the gap between the staggered arrangement of the first toothed roller 5 and the second toothed roller 6 is adjustable, thereby allowing precise control of the crushed particle size, reducing over-crushing, ensuring that more material becomes the required block-shaped finished product, and making the device widely adaptable.

[0038] Based on the above embodiments, a drive motor 11 is provided on one side of the first toothed roller 5. The drive motor 11 is used to drive the first toothed roller 5 and the second toothed roller 6 to perform circular motion. Preferably, there are two drive motors 11. Compared with single-motor drive, dual-motor drive can better cope with the drive power requirements of different loads, making the grading and crushing operation more efficient. Dual-motor drive can also ensure the synchronous rotation of the two toothed rollers, so that the material is subjected to a more uniform crushing force in the crushing chamber, thereby improving the crushing effect.

[0039] In some specific embodiments, the enclosed vibrating feeder 4 is suspended at the bottom of the conveying pipe 3. The vibration of the enclosed vibrating feeder 4 can promote the loosening and flow of materials in the hopper, reduce the friction and cohesion between materials, and make the materials easier to flow. After the first screening by the grid 2, the material flows downward. However, due to the special nature of the sheet-like material, it is easy to accumulate at the corners of the conveying pipe 3. The enclosed vibrating feeder 4 suspended at the bottom of the conveying pipe 3 can reduce the angle of accumulation of the material, further improve the flowability of the material, and ensure that the material can smoothly enter the conveying pipe 3.

[0040] Based on the above embodiments, the height of the feeding box of the enclosed vibrating feeder 4 is 350~500mm, and the discharge capacity is 150~250t / h. When the enclosed vibrating feeder 4 adopts an enclosed structure, dust pollution generated during material conveying can be effectively prevented. Preferably, according to the properties of the material in this application, the height of the feeding box is 400mm, and the discharge capacity is 200t / h.

[0041] To improve material flowability, in some specific embodiments, the conveying pipe 3 is inclined downwards at an angle to the horizontal direction. When the conveying pipe 3 is inclined downwards, gravity can be used to promote the flow of materials. The natural flow trend can significantly reduce the resistance encountered by the materials, increase the flow speed, and thus improve the efficiency of the entire conveying system. This can simply and effectively improve production efficiency and economic benefits.

[0042] In some specific embodiments, the length of the tooth structure 7 is 50-70 mm, and there are 40-50 tooth structures 7 arranged circumferentially. Preferably, according to the properties of the material in this application, the length of the tooth structure 7 is 60 mm, which can crush the material to 15-50 mm, and the number of tooth structures 7 is 45.

[0043] In some specific embodiments, the diameter of the first toothed roller 5 and the second toothed roller 6 is 500~700mm, and the length is 700~900mm. Preferably, the diameter of the first toothed roller 5 and the second toothed roller 6 is 600mm, and the length is 800mm.

[0044] Based on the above embodiments, the distance between the first toothed roller 5 and the second toothed roller 6 can be adjusted from 0 to 100 mm. The adjustable toothed roller spacing allows the double-toothed roller system of this application to be flexibly adjusted according to the particle size and hardness of different materials to adapt to different crushing requirements. By adjusting the toothed roller spacing, the output particle size can be precisely controlled to meet the needs of subsequent processes or applications. It also avoids unnecessary over-crushing, reduces energy consumption, protects crusher components, and extends service life. Preferably, the distance between the first toothed roller 5 and the second toothed roller 6 can be adjusted from 0 to 95 mm.

[0045] The metering system controls the residual amount of material in the upstream silo based on the subsequent process, ensuring a tight and orderly production process, and has the following functions: (1) Real-time weight display and error detection. The weight of the material in the packaging bag is displayed in real time; each weighing process is subject to error detection and judgment, and an alarm is triggered when the weight exceeds the tolerance. (2) Fault self-diagnosis. The weighing control terminal of the metering system has a fault self-diagnosis function and displays it through codes. Each cycle checks the existing quantity and automatically corrects deviations; (3) Automatic advance correction function. This function overcomes the impact of changes in material pressure and material properties in the intermediate silo to ensure packaging accuracy.

[0046] In some embodiments, the crushing device further includes a filtration system connected to the bottom discharge port of the toothed roller crushing system. The filtration system includes a fine filter, which further filters the crushed material to improve the accuracy of the crushed particle size. The fine filter is fixedly connected to a pressure detector, which acquires the pressure inside the fine filter in real time. This allows for real-time monitoring of pressure changes during the filtration process, enabling adjustments to filtration parameters based on the pressure data to ensure optimal filtration performance. When the system pressure is abnormal, the pressure detector will issue an alarm or automatically adjust system parameters to ensure the stability and reliability of the system operation.

[0047] The present invention has at least the following advantages: (1) Instead of the traditional lignite crushing and screening device toothed roller discharge method, a new toothed roller crushing device is adopted to effectively crush the material coming down from the feed hopper, especially the flaky material. Traditional small toothed rollers are prone to blocking the feed inlet due to the uneven size of the material and the flaky material mixed in the middle, which not only affects the crushing effect, but also makes the production discontinuous and inefficient. The invention designs a toothed roller with a hooked part, which can firmly grasp the flaky material during the crushing process and smoothly bite the flaky material into the crushing opening. It has high production efficiency, can deal with materials of various complex shapes, and ensures the continuity and stability of production.

[0048] (2) This application sets a metering component at the rear end of the toothed roller crusher to control the residual material in the hopper and ensure the continuous and stable operation of the toothed roller crusher by adjusting the feeding amount of the enclosed vibrating feeder.

[0049] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of different aspects of the invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A crushing and screening device, characterized in that, include: The feeding system includes a feeding bin, an inclined grid covering the feeding port of the feeding bin for screening materials, a closed vibrating feeder disposed at the bottom of the feeding bin, a conveying pipe connected to the closed vibrating feeder, a crankshaft connected to the closed vibrating feeder, and a variable frequency motor for driving the crankshaft to reciprocate. A magnetic separation system, the magnetic separation system including a permanent magnet device and / or an electromagnetic device disposed on the outer wall of the conveying pipe; The toothed roller crushing system includes a first toothed roller and a second toothed roller that move in opposite directions. The first toothed roller and the second toothed roller are provided with a plurality of tooth structures and grooves along the circumferential direction. The tooth structures are provided with grooves on the other toothed roller. The ends of the tooth structures are provided with beak-shaped hooks. The feed inlet of the toothed roller crushing system is located directly below the outlet of the conveying pipe. A metering system, the metering system including a weighing sensor installed at the bottom discharge port of the toothed roller crushing system; An instrument signal collection and remote transmission system, the instrument signal collection and remote transmission system including a pressure detector, the pressure detector acquiring and transmitting the pressure inside the fine filter in real time; as well as The control system is communicatively connected to the feeding system, magnetic separation system, toothed roller crushing system, metering system, and instrument signal collection and remote transmission system.

2. The crushing and screening device according to claim 1, characterized in that, A spring clamping assembly is provided between the first toothed roller and the second toothed roller. The spring clamping assembly can contract or extend to reduce or increase the distance between the first toothed roller and the second toothed roller.

3. The crushing and screening device according to claim 1, characterized in that, The extension direction of the hook portion is toward the movement direction of the first or second toothed roller in which it is located, and the connection of the hook portion is a smooth transition.

4. The crushing and screening device according to claim 1, characterized in that, The first toothed roller and the second toothed roller are staggered in a direction parallel to their axial direction, and the tooth structure of the first toothed roller and the second toothed roller has overlapping parts.

5. The crushing and screening device according to claim 1, characterized in that, Two drive motors are provided on one side of the first toothed roller, and the two drive motors are used to drive the first toothed roller and the second toothed roller to perform circumferential motion, respectively.

6. The crushing and screening device according to claim 1, characterized in that, The enclosed vibrating feeder is suspended at the bottom of the conveying pipe. The height of the feed box of the enclosed vibrating feeder is 350~450mm, and the discharge capacity is 150~250t / h.

7. The crushing and screening device according to claim 1, characterized in that, The length of the tooth structure is 50~70mm, and the number of teeth in the circumferential direction is 40~50.

8. The crushing and screening device according to claim 1, characterized in that, The diameter of the first and second toothed rollers is 500~700mm, and the length is 700~900mm.

9. The crushing and screening device according to claim 2, characterized in that, The distance between the first toothed roller and the second toothed roller can be adjusted within the range of 0~100mm.

10. The crushing and screening device according to claim 1, characterized in that, The net spacing between adjacent bars of the grid is ≤150mm.

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