Steel ball magnetic separation screening equipment of ball mill

Abstract

The utility model discloses magnetic separation screening equipment for steel balls of a ball mill. The magnetic separation screening equipment comprises a screening box, an upper-layer screening frame, a lower-layer screening frame, a magnetic separation screening mechanism and a vibration exciter, the upper-layer screening frame and the lower-layer screening frame are obliquely arranged in the screening box from top to bottom; a steel ball inlet is formed in the higher end, corresponding to the upper-layer screening frame, of the screening box. A first collecting tank is arranged at the lower end of the upper-layer screening frame, and a first screening outlet is formed in one side of the first collecting tank; a second collecting tank is arranged at the lower end of the lower-layer screening frame, and a second screening outlet is formed in one side of the second collecting tank; a discharging channel communicated with the lower layer is arranged behind the second collecting tank, one end of the magnetic separation screening mechanism is installed above the second collecting tank, and the other end of the magnetic separation screening mechanism stretches across the position above the discharging channel. The vibration exciter is installed at the bottom of the screening box. The special-shaped steel ball removing device can remove special-shaped steel balls and improve the quality of reused steel balls, so that the working efficiency of the ball mill is improved, the energy consumption is reduced, and the efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of ball mill steel ball screening equipment, and in particular to a ball mill steel ball magnetic separation screening equipment. Background Technology

[0002] Enterprises in various industries that use ball mills need to select steel balls of the correct size and shape for reuse when replacing them, while those that do not meet the requirements must be discarded and recycled as scrap metal. Currently, most enterprises empty the mill of its contents before manually sorting the steel balls through the cleaning port. A smaller number of enterprises use ball screening machines to separate the steel balls. These machines work by using a screen with a certain angle or a multi-layered screen composed of multiple steel pipes and reinforcing bars with varying spacing to separate the steel balls layer by layer under the combined action of gravity and the spacing between the steel pipes. When such screening devices perform screening, the selected steel balls have a partially qualified diameter. This means that steel balls with the correct diameter but irregular shapes are reused as qualified steel balls. For example, during the operation of the ball mill after screening, the steel balls are squeezed together to form rod-shaped or disc-shaped irregular iron blocks, causing changes in the diameter of these steel balls. If the maximum diameter of a certain steel ball happens to meet the requirements, but the minimum diameter does not, then this type of steel ball cannot be screened out by existing screening devices and often flows directly into the qualified steel ball area, and is then repeatedly added to the mill, affecting the working quality and efficiency of the ball mill, leading to increased energy consumption and costs. To solve the above technical problems, this application provides a magnetic separation screening device for steel balls in a ball mill. Utility Model Content

[0003] This invention provides a magnetic separation and screening device for steel balls in a ball mill, which can remove irregularly shaped steel balls with varying diameters, improve the quality of reusable steel balls, thereby increasing the working efficiency of the ball mill, reducing energy consumption, and improving overall efficiency.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A ball mill steel ball magnetic separation and screening device includes a screening box, an upper screening frame, a lower screening frame, a magnetic separation and screening mechanism, and a vibrator. The upper and lower screening frames are arranged inclined from top to bottom within the screening box. The screening box has a steel ball inlet at the higher end corresponding to the upper screening frame. The lower end of the upper screening frame has a first collection trough with a first screening outlet on one side. The lower end of the lower screening frame has a second collection trough with a second screening outlet on one side. A material discharge channel communicating with the lower layer is located behind the second collection trough. The magnetic separation and screening mechanism is located behind the first collection trough, with one end installed above the second collection trough and the other end extending across the material discharge channel. The vibrator is installed at the bottom of the screening box.

[0006] Furthermore, both the upper screening frame and the lower screening frame include several cylindrical screening rods arranged side by side. One end of each screening rod below the steel ball inlet is designated as the head end, and the other end is designated as the tail end. The screening spacing between any two adjacent screening rods is equal. The screening spacing of the lower screening frame is slightly smaller than that of the upper screening frame.

[0007] Furthermore, the magnetic separation screening mechanism includes a mounting frame, an electromagnetic adsorption assembly, a drive roller, a driven roller, several guide rollers, a conveyor belt, and a drive motor. The drive roller and the driven roller are arranged parallel to each other at the bottom of the mounting frame and are rotatably connected to the mounting frame. Several guide rollers are installed parallel to each other at the top of the mounting frame and are rotatably connected to the mounting frame. The conveyor belt is wound around the drive roller, the driven roller, and each of the guide rollers to form a circle. The drive motor is fixedly connected to the mounting frame and is driven by the drive roller. The drive motor drives the drive roller to rotate, thereby driving the conveyor belt to rotate from front to back. The electromagnetic adsorption assembly is fixedly connected inside the mounting frame and located inside the circle of the conveyor belt. The bottom of the electromagnetic adsorption assembly is flush with the lowest point of the drive roller and the driven roller, so that the inner side of the conveyor belt is in close contact with the bottom of the electromagnetic adsorption assembly. A scraper is fixedly connected to the rear end of the mounting frame, and one side of the scraper is spaced apart from the outer side of the conveyor belt. The magnetic force of the electromagnetic adsorption assembly is adjustable.

[0008] Furthermore, the electromagnetic adsorption assembly includes an electromagnet, a magnetic controller, and a magnet housing; the bottom of the housing is a flat surface, the electromagnet is arranged inside the housing, the electromagnet is electrically connected to the magnetic controller, and the magnetic controller is used to control the magnetic force of the electromagnet.

[0009] Furthermore, the ball mill steel ball magnetic separation screening equipment also includes a spiral pushing mechanism, which is installed in the first collecting trough and the pushing direction is towards the first screening outlet.

[0010] Furthermore, the ball mill steel ball magnetic separation screening equipment also includes a discharge detection mechanism; the discharge detection mechanism includes two infrared gratings, which are distributed one-to-one on both sides of the first screening outlet.

[0011] Further, the screening box includes a steel ball feed funnel, a screening box body, two front support legs, and two rear support legs; the steel ball feed funnel is fixedly connected to the top front end of the screening box body; the upper screening frame and the lower screening frame are arranged obliquely from top to bottom within the screening box body to divide the screening box body into an upper layer, a middle layer, and a lower layer from top to bottom; the lengths of the upper layer, the middle layer, and the lower layer extend sequentially, the first collection trough is located at the end of the upper layer, the second collection trough is located at the end of the middle layer, and the end of the middle layer is connected to the lower layer. The material discharge channel is formed between the ends of the layers; the lower layer is provided with a waste outlet, and the front and rear bottom surfaces of the lower layer are both inclined towards the waste outlet; the vibrator is installed at the bottom front end of the screening box; the two front support legs are respectively arranged on both sides of the front end of the screening box, and their tops are connected to the screening box through a buffer spring; the two rear support legs are respectively arranged on both sides of the rear end of the screening box, and their tops are hinged to the screening box; the vibrator is installed at the bottom front end of the screening box.

[0012] The beneficial effects of this utility model are:

[0013] 1) This utility model uses an upper screening rack and a lower screening rack for two-layer screening to select steel balls suitable for reuse. Then, taking advantage of the fact that irregular steel balls are less heavy than normal steel balls, a magnetic separation screening mechanism is used to suck out the irregular and irregularly shaped steel balls and collect them. Compared with existing steel ball screening machines, it can remove irregularly shaped steel balls with varying diameters, improve the quality of reusable steel balls, thereby improving the working efficiency of the ball mill, reducing energy consumption, and increasing efficiency.

[0014] 2) The upper screening rack can perform coarse screening to directly screen out qualified steel balls. The lower screening rack can perform secondary screening on steel balls that are in the critical qualified state to screen out reusable steel balls in the critical qualified state. The magnetic separation screening mechanism above the second collection tank can screen out the lighter steel balls by magnetic adsorption, and retain qualified steel balls. In order to prevent selection errors, the steel balls coming out of the second collection tank 31 can be put back into the steel ball inlet for secondary or even multiple screenings.

[0015] 3) The electromagnetic adsorption component can adjust the magnetic force to be slightly less than the weight of the minimum qualified steel ball. The lighter steel ball can be attracted by the magnetic force through the conveyor belt. During the movement of the conveyor belt, the attracted steel ball is transported to the rear end of the mounting frame. After the steel ball hits the scraper, it is resisted and inertia and thus detaches from the conveyor belt and falls from the discharge channel. The qualified steel ball is retained in the second collection tank and discharged from the second screening outlet.

[0016] 4) The spiral feeding mechanism can prevent steel balls from accumulating in the first collection tank 21 and forming a blockage, and assist the steel balls to move quickly to the first screening outlet for discharge.

[0017] 5) The discharge detection mechanism can detect whether steel balls are discharged from the first screening outlet. Under normal circumstances, steel balls are continuously discharged, and the signal detected by the infrared grating is intermittent. If there is no signal or the signal is continuous and uninterrupted, it indicates that a blockage or shortage of material has formed in the upper screening frame, which needs to be dealt with in time.

[0018] 6) The vibrator keeps the screening box vibrating, and the front end sways more violently during vibration, causing the steel balls to be thrown towards the rear end. During vibration, the steel balls land randomly on the screening rod at different angles, reducing the chance of failing to distinguish and screen out irregularly shaped or defective steel balls, thus lowering screening errors and improving screening efficiency. Attached Figure Description

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0020] Figure 1 This is a perspective view of the overall structure of this utility model;

[0021] Figure 2 This is a top view of the overall structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the present invention cut by a vertical bisecting plane;

[0023] Figure 4 This is a perspective view of the magnetic separation and screening mechanism in this utility model;

[0024] Figure 5 This is a side view of the magnetic separation and screening mechanism in this utility model;

[0025] Attached image labels:

[0026] 1-Screwing box, 2-Upper screening frame, 3-Lower screening frame, 4-Magnetic separation screening mechanism, 5-Vibrator, 6-Screw pusher mechanism, 7-Discharge detection mechanism, 11-Steel ball feed funnel, 12-Screwing box body, 13-Front support leg, 14-Rear support leg, 15-Waste outlet, 16-Buffer spring, 21-First collection trough, 22-First screening outlet, 31-Second collection trough, 32-Second screening outlet, 41-Mounting frame, 42-Electromagnetic adsorption assembly, 43-Drive roller, 44-Driven roller, 45-Guide roller, 46-Conveyor belt, 47-Drive motor, 61-Push rod drive motor, 62-Screw push rod. Detailed Implementation

[0027] 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.

[0028] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a central component. When a component is described as "connected to" another component, it can be directly connected to the other component or may have a central component. When a component is described as "set on" another component, it can be directly set on the other component or may have a central component. When a component is described as "set in the middle," it is not simply set in the exact center, as long as it is not set within the area defined by both ends being in the middle. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] Reference Figures 1 to 5As shown, a ball mill steel ball magnetic separation and screening device includes a screening box 1, an upper screening frame 2, a lower screening frame 3, a magnetic separation and screening mechanism 4, and a vibrator 5; the upper screening frame 2 and the lower screening frame 3 are arranged inclined from top to bottom in the screening box 1; the screening box 1 has a steel ball inlet at the higher end corresponding to the upper screening frame 2; the lower end of the upper screening frame 2 has a first collection trough 21, and a first screening outlet 22 is provided on one side of the first collection trough 21; the lower... The lower end of the screening frame 3 is provided with a second collection trough 31, and a second screening outlet 32 ​​is provided on one side of the second collection trough 31. A material discharge channel communicating with the lower layer is provided behind the second collection trough 31. The magnetic separation screening mechanism 4 is located behind the first collection trough 21, with one end of the magnetic separation screening mechanism 4 installed above the second collection trough 31 and the other end extending across the material discharge channel. The vibrator 5 is installed at the bottom of the screening box 1. This utility model uses an upper screening frame 2 and a lower screening frame 3 for two-layer screening to select steel balls of suitable diameter. Then, taking advantage of the fact that irregular steel balls are less heavy than normal steel balls, the magnetic separation screening mechanism 4 sucks out the irregularly shaped steel balls and collects them. Compared with existing steel ball screening machines, it can remove irregularly shaped steel balls with varying diameters, improve the quality of reusable steel balls, thereby improving the working efficiency of the ball mill, reducing energy consumption, and increasing efficiency.

[0031] Both the upper screening frame 2 and the lower screening frame 3 include several cylindrical screening rods arranged side by side. One end of each screening rod located below the steel ball inlet is designated as the head end, and the other end is designated as the tail end. The screening spacing between any two adjacent screening rods is equal. The screening spacing of the lower screening frame 3 is slightly smaller than that of the upper screening frame 2. For example, if the sieving standard for steel ball diameter is r = a, and the minimum reusable ball diameter is r > ab, then the sieving spacing of the upper sieving frame 2 is a. The upper sieving frame 2 can sieve steel balls with r > a, while those with r ≤ a will fall onto the lower sieving frame. The sieving spacing of the lower sieving frame 3 is set to ab, so the lower sieving frame can sieve steel balls with ab < r ≤ a, while those with r ≤ a will fall down. The steel balls sieved by the lower sieving frame 3 may have some irregular shapes; for example, some parts of the same steel ball may have a diameter r > ab at a certain position, but some parts with a diameter r < ab, which happen to pass through the lower sieving frame 3 and flow into the lower sieving frame. Upon entering the second collection tank 31, these steel balls, due to their different shapes, have a weight smaller than that of qualified steel balls with a diameter at the lower limit. Therefore, the upper screening rack can perform coarse screening to directly screen out the qualified steel balls. The lower screening rack can perform secondary screening on the steel balls in the critical qualified state to screen out the reusable steel balls in the critical qualified state. The magnetic separation screening mechanism 4 above the second collection tank 31 can screen out the smaller steel balls by magnetic adsorption, retaining the qualified steel balls. In order to prevent selection errors, the steel balls coming out of the second collection tank 31 can be put back into the steel ball inlet for secondary or even multiple screenings.

[0032] The magnetic separation screening mechanism 4 includes a mounting frame 41, an electromagnetic adsorption assembly 42, a drive roller 43, a driven roller 44, several guide rollers 45, a conveyor belt 46, and a drive motor 47. The drive roller 43 and the driven roller 42 are arranged parallel to each other at the bottom of the mounting frame 41 and are rotatably connected to the mounting frame 41. Several guide rollers 45 are installed parallel to each other at the top of the mounting frame 41 and are rotatably connected to the mounting frame 41. The conveyor belt 46 is wound around the drive roller 43, the driven roller 44, and each of the guide rollers 45 to form a circle. The drive motor 47 is fixedly connected to the mounting frame 41 and... The drive roller 43 is driven by the drive motor 47, which drives the drive roller 43 to rotate, thereby causing the conveyor belt 46 to rotate from front to back. The electromagnetic adsorption component 42 is fixedly connected inside the mounting frame 41 and located inside the loop of the conveyor belt 46. The bottom of the electromagnetic adsorption component 42 is flush with the lowest end of the drive roller 43 and the driven roller 44, so that the inner side of the conveyor belt 46 is in close contact with the bottom of the electromagnetic adsorption component 42. A scraper 48 is fixedly connected to the rear end of the mounting frame 41, and one side of the scraper 48 is spaced apart from the outer side of the conveyor belt 46. The magnetic force of the electromagnetic adsorption component 42 is adjustable. The electromagnetic adsorption assembly 42 includes an electromagnet, a magnetic controller, and a magnet housing. The bottom of the housing is flat, and the electromagnet is arranged inside the housing. The electromagnet is electrically connected to the magnetic controller, which controls the magnetic force of the electromagnet. Through multiple experiments, the magnetic force can be adjusted to be slightly less than the weight of the minimum qualified steel ball. This allows the lighter steel ball to be magnetically attracted to the conveyor belt. During the conveyor's movement, the attracted steel ball is transported to the rear end of the mounting frame. After the steel ball hits the scraper, it is resisted and inertial, causing it to detach from the conveyor belt and fall from the discharge channel. Qualified steel balls are retained in the second collection trough 31 and discharged from the second screening outlet 32. In this embodiment, the mounting frame includes two connecting plates arranged parallel to each other in the vertical direction. The two connecting plates are connected and fixed by several crossbeams. The side wall of the magnet housing is fixedly connected to a corresponding connecting part. The driving roller 43, the driven roller 44, and several guide rollers 45 are all rotatably connected between the two connecting plates.

[0033] Since the upper screening frame 2 receives a large number of steel balls, a large number of steel balls exit from the first screening outlet 22 of the first collection trough 21. To prevent the steel balls from accumulating in the first collection trough 21 and causing blockage, the bottom surface of the first collection trough 21 should be inclined towards the first screening outlet 22. Moreover, to assist the steel balls in moving quickly towards the first screening outlet, the ball mill steel ball magnetic separation screening equipment is also equipped with a spiral pushing mechanism 6. The spiral pushing mechanism 6 is installed in the first collection trough 31, and the pushing direction is towards the first screening outlet. In this embodiment, the spiral feeding mechanism 6 includes a push rod drive motor 61 and a spiral push rod 62. A feeding hole is provided in the first collection tank 21 along the extension direction of the first screening outlet 22. The spiral push rod 62 is rotatably connected to the lower part of the first collection tank 21. The top of the spiral push rod 62 is located in the mounting hole and protrudes from the mounting hole to the bottom surface of the first collection tank 21. It should be noted that the spiral push rod 62 and the mounting hole are in clearance fit, and the clearance should be much smaller than the diameter of the steel ball. The diameter of the spiral blade of the spiral push rod should also be smaller than the diameter of the steel ball to avoid the steel ball getting stuck in the gap. The push rod drive motor 6 is fixedly connected to the outside of the first collection tank 21 and is connected to the spiral push rod 62 in a transmission connection. The feeding direction of the spiral push rod 62 is towards the first screening outlet 22.

[0034] The ball mill steel ball magnetic separation screening equipment further includes a discharge detection mechanism 7; the discharge detection mechanism 7 includes two infrared gratings, which are distributed one-to-one on both sides of the first screening outlet to detect whether steel balls are discharged from the first screening outlet. Under normal circumstances, steel balls are continuously discharged, and the signal detected by the infrared gratings is continuous and alternating. If no object is detected or the signal is continuous and uninterrupted, it indicates that a blockage has formed in the upper screening frame 2 or no material is coming down, which needs to be dealt with in time.

[0035] The screening box 1 includes a steel ball feed funnel 11, a screening box body 12, two front support legs 13, and two rear support legs 14. The steel ball feed funnel 11 is fixedly connected to the top of the front end of the screening box body 12, and the top of the steel ball feed funnel is the steel ball inlet. The upper screening frame 2 and the lower screening frame 3 are arranged obliquely from top to bottom inside the screening box body 12 to divide the screening box body 12 into an upper layer, a middle layer, and a lower layer from top to bottom. The lengths of the upper layer, the middle layer, and the lower layer extend sequentially. The first collection trough 21 is located at the end of the upper layer, and the second collection trough 31 is located at the end of the middle layer. The material discharge channel is formed between the end of the middle layer and the end of the lower layer. The lower layer is provided with a waste outlet 15, and the bottom surface of the front end of the lower layer is connected to the rear end of the lower layer. The bottom surfaces are all inclined towards the waste outlet 15; the vibrator 5 is installed at the bottom front end of the screening box 12; the two front support legs 13 are respectively arranged on both sides of the front end of the screening box 12, and their tops are connected to the screening box 12 through a buffer spring 16; the two rear support legs 14 are respectively arranged on both sides of the rear end of the screening box 12, and their tops are hinged to the screening box 12; the vibrator 5 is installed at the bottom front end of the screening box, and the vibrator 5 can make the screening box 12 vibrate, and when vibrating, the front end shakes more, so that the steel balls can be thrown to the rear end. During the vibration, the steel balls fall randomly on the screening rod in different directions, reducing the probability that irregular and unqualified steel balls cannot be distinguished and screened out, reducing screening errors, and improving screening effect.

[0036] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of the technical solution of this utility model.

Claims

1. A magnetic separation and screening device for steel balls in a ball mill, characterized in that, The system includes a screening box, an upper screening frame, a lower screening frame, a magnetic separation screening mechanism, and a vibrator. The upper and lower screening frames are arranged inclined from top to bottom within the screening box. The screening box has a steel ball inlet at the higher end corresponding to the upper screening frame. The lower end of the upper screening frame has a first collection trough with a first screening outlet on one side. The lower end of the lower screening frame has a second collection trough with a second screening outlet on one side. A material discharge channel communicating with the lower layer is located behind the second collection trough. The magnetic separation screening mechanism is located behind the first collection trough, with one end mounted above the second collection trough and the other end extending across the material discharge channel. The vibrator is installed at the bottom of the screening box.

2. The ball mill steel ball magnetic separation and screening equipment according to claim 1, characterized in that, Both the upper and lower screening racks include several cylindrical screening rods arranged side by side. Each screening rod has one end below the steel ball inlet designated as the head end and the other end designated as the tail end. The screening spacing between any two adjacent screening rods is equal. The screening spacing of the lower screening rack is slightly smaller than that of the upper screening rack.

3. The ball mill steel ball magnetic separation and screening equipment according to claim 1, characterized in that, The magnetic separation and screening mechanism includes a mounting frame, an electromagnetic adsorption assembly, a drive roller, a driven roller, several guide rollers, a conveyor belt, and a drive motor. The drive roller and the driven roller are arranged parallel to each other at the bottom of the mounting frame and are rotatably connected to the mounting frame. Several guide rollers are installed parallel to each other at the top of the mounting frame and are rotatably connected to the mounting frame. The conveyor belt is wound around the drive roller, the driven roller, and each of the guide rollers to form a circle. The drive motor is fixedly connected to the mounting frame and is driven by the drive roller. The drive motor drives the drive roller to rotate, thereby driving the conveyor belt to rotate from front to back. The electromagnetic adsorption assembly is fixedly connected inside the mounting frame, located inside the circle of the conveyor belt. The bottom of the electromagnetic adsorption assembly is flush with the lowest point of the drive roller and the driven roller, so that the inner side of the conveyor belt is in close contact with the bottom of the electromagnetic adsorption assembly. A scraper is fixedly connected to the rear end of the mounting frame, and one side of the scraper is spaced apart from the outer side of the conveyor belt. The magnetic force of the electromagnetic adsorption assembly is adjustable.

4. The ball mill steel ball magnetic separation and screening equipment according to claim 3, characterized in that, The electromagnetic adsorption assembly includes an electromagnet, a magnetic controller, and a magnet housing; the bottom of the housing is flat, the electromagnet is arranged inside the housing, the electromagnet is electrically connected to the magnetic controller, and the magnetic controller is used to control the magnetic force of the electromagnet.

5. The ball mill steel ball magnetic separation and screening equipment according to claim 1, characterized in that, The ball mill steel ball magnetic separation screening equipment further includes a spiral pushing mechanism, which is installed in the first collection tank and the pushing direction is towards the first screening outlet.

6. The ball mill steel ball magnetic separation and screening equipment according to claim 5, characterized in that, The ball mill steel ball magnetic separation screening equipment further includes a discharge detection mechanism; the discharge detection mechanism includes two infrared gratings, which are distributed one-to-one on both sides of the first screening outlet.

7. A magnetic separation and screening device for steel balls in a ball mill according to claim 2, characterized in that, The screening box includes a steel ball feed funnel, a screening box body, two front support legs, and two rear support legs; the steel ball feed funnel is fixedly connected to the top front end of the screening box body; the upper screening frame and the lower screening frame are arranged obliquely from top to bottom within the screening box body to divide the screening box body into an upper layer, a middle layer, and a lower layer from top to bottom; the lengths of the upper layer, the middle layer, and the lower layer extend sequentially, the first collection trough is located at the end of the upper layer, the second collection trough is located at the end of the middle layer, and the end of the middle layer is adjacent to the end of the lower layer. The material discharge channel is formed between the ends; the lower layer is provided with a waste outlet, and the front and rear bottom surfaces of the lower layer are both inclined towards the waste outlet; the vibrator is installed at the bottom of the front end of the screening box; the two front support legs are respectively arranged on both sides of the front end of the screening box, and their tops are connected to the screening box through a buffer spring; the two rear support legs are respectively arranged on both sides of the rear end of the screening box, and their tops are hinged to the screening box; the vibrator is installed at the bottom of the front end of the screening box.

Images