Sludge drying device with high-energy ball milling function

Abstract

The present application belongs to the technical field of sludge drying, and particularly relates to a sludge drying device with high-energy ball milling function, which comprises a box body and a heating box. Two partitions are arranged in the box body, and the box body is divided into a drying cavity, a blast cavity and a grinding cavity from top to bottom by the two partitions. The heating box is arranged on the upper partition. An air outlet is arranged on the top of the heating box. Two groups of conveying belts arranged in an up-down mode and having opposite conveying directions are arranged in the drying cavity. The conveying belt is composed of a chain wheel, a chain and a plurality of conveying nets. One end of the conveying net is fixed to the chain, and the other end of the conveying net is a free end. The sludge drying and grinding processes are integrated in the same device, so that the overall efficiency of sludge resource utilization is effectively improved. In addition, the cleaning assembly and the forming roller are arranged, so that the possibility of mesh blockage is effectively avoided, and the sludge drying efficiency and the uniformity of sludge drying are ensured.

Description

Technical Field

[0001] This invention belongs to the field of sludge drying technology, and in particular relates to a sludge drying device with high-energy ball milling function. Background Technology

[0002] Low-temperature sludge drying refers to the technology of reducing and stabilizing sludge by lowering its moisture content under mild conditions of 40-70℃. Low-temperature sludge drying machines include mesh belt dryers and heat pump units. The core of the technology is to use the hot air produced by the heat pump unit to evaporate the moisture in the sludge. It has advantages such as energy saving, environmental protection and safety, and is one of the mainstream technologies in the field of sludge drying.

[0003] A patent with publication number CN119841529B discloses a sludge drying device, including a housing. This sludge drying device replaces the original double-layer structure of the conveyor belt used for transporting sludge with a single-layer conveyor net. The single-layer conveyor net is unobstructed, and the high-temperature drying air can directly reach the single-layer conveyor net without obstruction. This reduces the resistance of the high-temperature drying air before reaching the sludge, reduces the energy consumption of the high-temperature drying air, and improves the sludge drying efficiency.

[0004] The existing device also has the following shortcomings:

[0005] 1. Before drying, sludge has a certain degree of plasticity. During the operation of the above-mentioned sludge drying device, after the sludge falls from the feed inlet onto the conveyor network, the sludge in contact with the conveyor network enters the mesh under the action of gravity and the impact force when falling. During the drying process, the sludge stuck in the mesh will stick to the mesh. When the sludge moves to the end of the conveyor belt, the sludge stuck in the mesh is difficult to fall off normally, which leads to mesh blockage. Consequently, the hot air cannot be blown to the sludge from below the conveyor network, affecting the sludge drying efficiency and the uniformity of sludge drying.

[0006] 2. Existing sludge drying devices produce large lumps or agglomerates of dried sludge, which cannot be directly used for subsequent resource utilization. Additional equipment is required to grind the dried sludge, making the overall process of sludge resource utilization cumbersome, with low efficiency and high equipment costs.

[0007] 3. Sludge usually contains magnetic impurities such as iron nails and nuts. These impurities have high hardness and are hidden inside the sludge. When sludge is ball-milled, these impurities will damage the ball milling equipment and affect the service life of the equipment. Summary of the Invention

[0008] The purpose of this invention is to address the problems mentioned in the background section by providing a sludge drying device with high-energy ball milling function.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a sludge drying device with high-energy ball milling function, comprising:

[0010] The chamber has two partitions inside, which divide the chamber into a drying chamber, a blowing chamber, and a grinding chamber from top to bottom.

[0011] A heating chamber is located on the upper partition, and an air outlet is provided on the top of the heating chamber;

[0012] The drying chamber is equipped with two sets of conveyor belts arranged vertically and in opposite directions. The conveyor belts consist of sprockets, chains and multiple conveyor nets. One end of the conveyor net is fixed to the chain, and the other end of the conveyor net is a free end. When the conveyor net moves to the bottom of the conveyor belt, the conveyor net is in a vertical state under the action of gravity.

[0013] The blower chamber is equipped with multiple blowers, and the air outlets of the multiple blowers are all connected to the heating box. The airflow generated by the blower chamber is heated by the heating box and then blown into the drying chamber.

[0014] The grinding chamber is equipped with a ball mill cylinder and a ball mill motor for driving the ball mill cylinder to rotate. The ball mill motor and the ball mill cylinder are connected by a gear reduction transmission.

[0015] Furthermore, the top of the drying chamber is provided with a feed inlet and an exhaust outlet. A pair of forming rollers are provided inside the feed inlet. The forming rollers are driven by a forming motor. After the sludge enters the feed inlet, it is squeezed and formed by the forming rollers and falls onto the conveyor belt above.

[0016] Furthermore, the conveyor belt described above has a first receiving hopper at its conveying end. The first receiving hopper contains a pair of cutting rollers. The cutting rollers are driven by a cutting motor. The sludge on the conveyor belt above falls into the first receiving hopper, is cut into strips, and then falls onto the conveyor belt below.

[0017] Furthermore, the conveyor belt described below has a second receiving hopper at its conveying end, and the discharge port of the second receiving hopper is connected to the feed port of the ball mill cylinder through a feeding pipe.

[0018] Furthermore, the drying chamber is equipped with a cleaning assembly for cleaning the conveyor network. The cleaning assembly includes a support shaft fixed to the side wall of the chamber, and an annular support seat is rotatably fitted on the support shaft. Multiple L-shaped plates are arranged in an array and tilted on the outer wall of the annular support seat. The end of the L-shaped plate away from the annular support seat is comb-shaped.

[0019] Furthermore, the cleaning assembly also includes an annular groove formed on the annular support base. The sidewall of the annular groove is provided with a plurality of arrayed wedge-shaped protrusions. The support shaft has a plurality of sliding grooves inside. A wedge-shaped slider adapted to the wedge-shaped protrusions is slidably fitted in the sliding groove. A return spring is provided between the wedge-shaped slider and the bottom of the sliding groove. When the conveyor belt passes through the cleaning assembly, the comb teeth of the L-shaped plate pass through the mesh holes and pull the conveyor belt, and the conveyor belt shakes under the cooperation of the wedge-shaped protrusions, the wedge-shaped slider and the return spring.

[0020] Furthermore, the support shaft is also provided with an impurity removal component. The impurity removal component includes a support rod fixed on the support shaft. The support rod is provided with a sleeve. The outer wall of the sleeve is provided with multiple fan-shaped grooves. Electromagnets are embedded in the fan-shaped grooves. When the sludge on the conveyor belt below is transported to the area below the electromagnet, the electromagnet removes the magnetic impurities in the sludge.

[0021] Furthermore, the impurity removal assembly also includes multiple conductive posts fixed to the inner wall of the sleeve. The number and position of the conductive posts correspond one-to-one with the electromagnets. An annular conductive plate with a sliding fit between the conductive posts and the conductive posts is fixed on the support rod. The annular conductive plate has a notch. When the conductive post contacts the annular conductive plate, the corresponding electromagnet is energized and becomes magnetic. When the conductive post is at the notch of the annular conductive plate, the corresponding electromagnet is de-energized.

[0022] Furthermore, a collection frame is provided on the side wall of the box, and an inclined guide plate is provided in the drying chamber. After the electromagnet is de-energized, the magnetic impurities adsorbed on it fall onto the guide plate under the action of gravity and then slide into the collection frame.

[0023] Compared with existing technologies, the advantages of this invention are:

[0024] 1. This invention integrates the sludge drying and grinding processes into the same device, effectively improving the overall efficiency of sludge resource utilization and eliminating the risk of dust pollution during material transfer. It also reduces the equipment footprint. Furthermore, this invention slices and cuts the sludge into strips before grinding, so that the sludge is in a smaller size when it enters the ball mill, which is conducive to improving grinding efficiency and further improving the overall efficiency of sludge resource utilization.

[0025] 2. By setting up a cleaning component and a forming roller, the design of the forming roller makes the sludge structure more compact and reduces the fluidity of the sludge, thereby reducing the possibility of sludge seeping into the mesh after falling onto the conveyor network. The cleaning component further cleans the conveyor network and removes the sludge that has seeped into the mesh, effectively avoiding the possibility of mesh blockage and ensuring sludge drying efficiency and uniformity.

[0026] 3. By setting up an impurity removal component, the present invention can remove magnetic impurities (such as screws, nuts, etc.) in the sludge during the sludge drying process, thereby avoiding damage to the ball milling equipment caused by magnetic impurities during sludge ball milling and improving the service life of the equipment. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a sludge drying device with high-energy ball milling function provided by the present invention;

[0028] Figure 2 This is another perspective schematic diagram of the overall structure of a sludge drying device with high-energy ball milling function provided by the present invention;

[0029] Figure 3 This is a schematic diagram of the internal structure of a sludge drying device with high-energy ball milling function provided by the present invention;

[0030] Figure 4 This is a top view schematic diagram of the overall structure of a sludge drying device with high-energy ball milling function provided by the present invention;

[0031] Figure 5 yes Figure 4 Sectional view along the AA direction;

[0032] Figure 6 This is a schematic diagram of the internal structure of the feed inlet of a sludge drying device with high-energy ball milling function provided by the invention.

[0033] Figure 7 This is a schematic diagram of the internal structure of the first receiving hopper of a sludge drying device with high-energy ball milling function provided by the invention.

[0034] Figure 8 This is a schematic diagram of the conveyor network structure of a sludge drying device with high-energy ball milling function provided by the invention;

[0035] Figure 9 This is a schematic diagram of the support shaft structure of a sludge drying device with high-energy ball milling function provided by the invention;

[0036] Figure 10 This is a schematic diagram of the annular support structure of a sludge drying device with high-energy ball milling function provided by the invention;

[0037] Figure 11 This is a schematic diagram of the cleaning component structure of a sludge drying device with high-energy ball milling function provided by the invention;

[0038] Figure 12 This is a schematic diagram of the impurity removal component of a sludge drying device with high-energy ball milling function provided by the invention.

[0039] In the diagram, 1 is the housing, 11 is the partition, 12 is the drying chamber, 13 is the blowing chamber, 14 is the grinding chamber, 15 is the heating chamber, 121 is the sprocket, 122 is the chain, 123 is the conveyor network, 131 is the blower, 141 is the ball mill cylinder, and 142 is the ball mill motor.

[0040] 1200 Exhaust port, 1201 Feed inlet, 1202 Forming roller, 1203 Forming motor, 1204 First receiving hopper, 1205 Cutting roller, 1206 Cutting motor, 1207 Second receiving hopper, 1208 Feeding pipe;

[0041] 21 Support shaft, 22 Annular support seat, 23 L-shaped plate, 24 Annular groove, 241 Wedge-shaped protrusion, 211 Slide groove, 212 Wedge-shaped slider, 213 Return spring, 25 Support rod, 251 Sleeve, 253 Electromagnet, 254 Conductive column, 255 Annular conductive sheet, 26 Collection frame, 27 Guide plate. Detailed Implementation

[0042] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0043] like Figures 1-12 As shown, a sludge drying device with high-energy ball milling function includes a box body 1 and a heating box 15. The box body 1 is provided with two partitions 11. The partitions 11 are made of heat insulation material. The two partitions 11 divide the box body 1 from top to bottom into a drying chamber 12, a blowing chamber 13 and a grinding chamber 14. The heating box 15 is located on the upper partition 11. The top of the heating box 15 is provided with an air outlet.

[0044] The blower chamber 13 is equipped with multiple blowers 131, and the air outlets of the multiple blowers 131 are all connected to the heating box 15. The airflow generated by the blower chamber 13 is heated by the heating box 15 and then blown into the drying chamber 12.

[0045] The grinding chamber 14 is equipped with a ball mill cylinder 141 and a ball mill motor 142 for driving the ball mill cylinder 141 to rotate. The ball mill cylinder 141 is equipped with multiple grinding balls. The ball mill motor 142 and the ball mill cylinder 141 are driven by gear reduction. The discharge port of the ball mill cylinder 141 extends to the outside of the box 1. The discharge port of the ball mill cylinder 141 is equipped with a flange, which can be connected to a conveying device to transport the dried and ground sludge to a designated location.

[0046] The top of the drying chamber 12 is provided with a feed inlet 1201 and an exhaust outlet 1200. The exhaust outlet 1200 is provided with a flange, which can be connected to the waste gas treatment equipment. A pair of forming rollers 1202 are provided inside the feed inlet 1201. The forming rollers 1202 refer to a pair of cylindrical rollers with a preset distance. Specifically, they can be made of chrome-plated metal rollers. The forming rollers 1202 are driven by a forming motor 1203. After the sludge enters the feed inlet 1201, it is squeezed and formed by the forming rollers 1202 and then falls onto the conveyor belt above.

[0047] In actual operation, after the sludge enters the feed inlet 1201, it is formed into a sheet of uniform thickness by the rotation and extrusion of the forming roller 1202. The formed sludge has a dense structure and a flat surface, which can reduce the dispersion of the sludge when it comes into contact with the conveyor net 123 and reduce the possibility of unformed sludge seeping into the net. In addition, the sludge can be formed by the forming roller 1202 to avoid local accumulation of sludge and make the sludge drying more uniform. The water vapor generated during the sludge drying process is discharged through the exhaust port 1200.

[0048] The drying chamber 12 is equipped with two sets of conveyor belts arranged vertically and in opposite directions. The conveyor belts consist of sprockets 121, chains 122 and multiple conveyor nets 123. One end of the conveyor net 123 is fixed to the chain 122, and the other end of the conveyor net 123 is a free end. When the conveyor net 123 moves to the bottom of the conveyor belt, the conveyor net 123 is in a vertical state under the action of gravity.

[0049] The upper conveyor belt has a first receiving hopper 1204 at its end. The first receiving hopper 1204 contains a pair of cutting rollers 1205. The cutting rollers are cylindrical components with cutting blades, which can be metal rollers with spiral blades on their surface. The sludge is cut by rotation. The cutting rollers 1205 are driven by a cutting motor 1206. The sludge on the upper conveyor belt falls into the first receiving hopper 1204, is cut into strips, and then falls onto the lower conveyor belt. In this embodiment, the two conveyor belts are driven by a forming roller 1202 and a cutting roller 1205, respectively. Specifically, the drive shaft of the upper conveyor belt is connected to the forming roller 1202 by a belt and a pulley, and the drive shaft of the lower conveyor belt is connected to the cutting roller 1205 by a belt and a pulley.

[0050] In practice, the pre-dried sludge falls from the end of the upper conveyor belt into the first receiving hopper 1204, and after being cut into strips by the cutting roller 1205, it falls onto the lower conveyor belt. This process allows the sludge to have a larger surface area exposed to the hot air during the secondary drying stage, which is beneficial to improving drying efficiency. On the other hand, cutting the sludge into smaller strips is more conducive to subsequent grinding work. In addition, the smaller sludge is lighter and its magnetic impurities are more easily exposed.

[0051] The lower conveyor belt has a second receiving hopper 1207 at the end of its conveying end. The discharge port of the second receiving hopper 1207 is connected to the feed port of the ball mill cylinder 141 through the feeding pipe 1208.

[0052] In actual operation, the sludge after secondary drying is transported to the end of the conveyor belt below. Under the action of gravity, the sludge falls into the second receiving hopper 1207 and is then introduced into the ball mill cylinder 141 through the feeding pipe 1208.

[0053] The drying chamber 12 is equipped with a cleaning assembly for cleaning the conveyor network 123. The cleaning assembly includes a support shaft 21 fixed to the side wall of the housing 1, an annular support seat 22 rotatably fitted on the support shaft 21, and multiple L-shaped plates 23 arranged in an array and inclined on the outer wall of the annular support seat 22. The end of the L-shaped plate 23 away from the annular support seat 22 is comb-shaped. The cleaning assembly also includes an annular groove 24 formed on the annular support seat 22, and multiple annular grooves 24 are arranged in an array on the side wall of the annular groove 24. The wedge-shaped protrusion 241 has multiple grooves 211 inside the support shaft 21. A wedge-shaped slider 212 that matches the wedge-shaped protrusion 241 slides in the groove 211. A return spring 213 is provided between the wedge-shaped slider 212 and the bottom of the groove 211. When the conveyor net 123 passes through the cleaning component, the comb teeth of the L-shaped plate 23 pass through the mesh and pull the conveyor net 123. The conveyor net 123 shakes under the cooperation of the wedge-shaped protrusion 241, the wedge-shaped slider 212 and the return spring 213.

[0054] In practice, although the undried sludge has a relatively compact structure after being extruded by the forming roller 1202, it still retains a certain degree of fluidity due to its high moisture content. When the sludge falls onto the conveyor network 123, some of it will still embed itself in the mesh due to the impact force. When the conveyor network 123 moves to the cleaning component position, the comb teeth of the L-shaped plate 23 pull the conveyor network 123 through the mesh. Under the pull of the conveyor network 123, the L-shaped plate 23 drives the annular support 22 to rotate. When the wedge-shaped protrusion 241 contacts the wedge-shaped surface of the wedge-shaped slider 212, the rotation of the annular support 22 is resisted and its speed slows down, thereby pulling the conveyor network 123 and making the conveyor... The mesh 123 deforms, squeezing the sludge out of the mesh. When the annular support 22 rotates until the wedge-shaped protrusion 241 separates from the wedge-shaped slider 212, the rotational resistance of the annular support 22 decreases and the rotational speed increases. Thus, the rotational speed of the annular support 22 fluctuates, which has the effect of shaking the conveyor mesh 123 and improving the cleaning effect of the conveyor mesh 123 until the conveyor mesh 123 separates from the L-shaped plate 23. Since the fluidity of the sludge is further reduced after preliminary drying, in this embodiment, only the conveyor mesh 123 of the upper conveyor belt is cleaned. If it is necessary to clean the conveyor mesh 123 of the lower conveyor belt, it is only necessary to add a cleaning component below the output end of the lower conveyor belt.

[0055] The support shaft 21 is also equipped with an impurity removal assembly, which includes a support rod 25 fixed to the support shaft 21. A sleeve 251 is provided on the outside of the support rod 25. The sleeve 251 is fixedly connected to the annular support seat 22 by screws. When the annular support seat 22 rotates, it drives the sleeve 251 to rotate synchronously. Multiple fan-shaped grooves are opened on the outer wall of the sleeve 251. Electromagnets 253 are embedded in the fan-shaped grooves. When the sludge on the lower conveyor belt is transported to the area below the electromagnet 253, the electromagnet 253 removes magnetic impurities from the sludge. In addition, the impurity removal assembly also includes multiple conductive posts 254 fixed to the inner wall of the sleeve 251. The number and position of the conductive posts 254 correspond one-to-one with the electromagnets 253. An annular conductive plate 255 that slides with the conductive posts 254 is fixed on the support rod 25. The annular conductive plate 255 has a notch. When the conductive post 254 contacts the annular conductive plate 255, the corresponding electromagnet 253 is energized and becomes magnetic. When the conductive post 254 is at the notch of the annular conductive plate 255, the corresponding electromagnet 253 is de-energized.

[0056] In actual operation, when the small strips of sludge on the lower conveyor belt pass by the electromagnet 253, the electromagnet 253 will adsorb the exposed magnetic impurities or sludge containing magnetic impurities. As the annular support 22 rotates, the sleeve 251 drives the electromagnet 253 to rotate synchronously. When the electromagnet 253 rotates to the right horizontal position, its corresponding conductive post 254 is at the notch of the annular conductive sheet 255. The electromagnet 253 loses power and loses its magnetism, and the magnetic impurities or sludge containing magnetic impurities adsorbed on it fall off under the action of gravity.

[0057] A collection frame 26 is provided on the side wall of the box 1, and an inclined guide plate 27 is provided in the drying chamber 12. After the electromagnet 253 is de-energized, the magnetic impurities adsorbed on it fall onto the guide plate 27 under the action of gravity and then slide into the collection frame 26.

[0058] The working principle of this invention is as follows:

[0059] During operation, the forming motor 1203, the cutting motor 1206, the ball mill motor 142, and the blower 131 are turned on to introduce the sludge to be dried into the feed inlet 1201. After entering the feed inlet 1201, the sludge is formed into a sheet of uniform thickness by the rotation and extrusion of the forming roller 1202. After being extruded into sheets, the sludge falls onto the conveyor belt above and is transported to the first receiving hopper 1204. During the conveying process on the conveyor belt above, the sludge is initially dried by the hot air blown out by the blower 131.

[0060] After the sludge is initially dried, it is cut into strips after entering the first receiving hopper 1204 and then falls onto the lower conveyor belt. The lower conveyor belt transports the strip sludge to the second receiving hopper 1207, and then it is fed into the ball mill by the feeding pipe 1208 for grinding. During the sludge is transported on the lower conveyor belt, it is dried again by the hot air blown by the blower 131.

[0061] When the conveyor net 123 of the upper conveyor belt rotates to the bottom of the conveyor belt, it is in a vertical state under the action of gravity. When the conveyor net 123 moves to the position of the cleaning component, the comb teeth of the L-shaped plate 23 pass through the mesh and pull the conveyor net 123. Under the pull of the conveyor net 123, the L-shaped plate 23 drives the annular support seat 22 to rotate. When the wedge-shaped protrusion 241 contacts the wedge-shaped surface of the wedge-shaped slider 212, the rotation of the annular support seat 22 is resisted and the rotation speed slows down, thereby pulling the conveyor net 123 and causing the conveyor net 123 to deform, squeezing the sludge in the mesh. When the annular support seat 22 rotates to the point where the wedge-shaped protrusion 241 separates from the wedge-shaped slider 212, the rotation resistance of the annular support seat 22 decreases and the rotation speed increases. In this way, the rotation speed of the annular support seat 22 fluctuates, which has the effect of shaking the conveyor net 123 and improving the cleaning effect of the conveyor net 123.

[0062] When the small strips of sludge on the lower conveyor belt pass by the electromagnet 253, the electromagnet 253 adsorbs the exposed magnetic impurities or sludge containing magnetic impurities. As the annular support 22 rotates, the sleeve 251 drives the electromagnet 253 to rotate synchronously. When the electromagnet 253 rotates to the right horizontal position, its corresponding conductive post 254 is at the notch of the annular conductive sheet 255. The electromagnet 253 is de-energized and loses its magnetism. The magnetic impurities or sludge containing magnetic impurities adsorbed on it fall off under the action of gravity. The fallen magnetic impurities or sludge containing magnetic impurities are guided into the collection frame 26 by the guide plate 27.

[0063] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sludge drying device with high-energy ball milling function, characterized in that, include: The box (1) is provided with two partitions (11), which divide the box (1) from top to bottom into a drying chamber (12), a blowing chamber (13) and a grinding chamber (14). A heating box (15) is located on the partition (11) above it, and an air outlet is provided on the top of the heating box (15); The drying chamber (12) is equipped with two sets of conveyor belts arranged vertically and in opposite directions. The conveyor belts are composed of sprockets (121), chains (122) and multiple conveyor nets (123). One end of the conveyor net (123) is fixed to the chain (122), and the other end of the conveyor net (123) is a free end. When the conveyor net (123) moves to the bottom of the conveyor belt, the conveyor net (123) is in a vertical state under the action of gravity. The blower chamber (13) is equipped with multiple blowers (131), and the air outlets of the multiple blowers (131) are all connected to the heating box (15). The airflow generated by the blower chamber (13) is heated by the heating box (15) and then blown into the drying chamber (12). The grinding chamber (14) is provided with a ball mill cylinder (141) and a ball mill motor (142) for driving the ball mill cylinder (141) to rotate. The ball mill motor (142) and the ball mill cylinder (141) are connected by a gear reduction transmission. The drying chamber (12) is provided with a cleaning assembly for cleaning the conveyor network (123). The cleaning assembly includes a support shaft (21) fixed on the side wall of the box (1). An annular support seat (22) is rotatably fitted on the support shaft (21). Multiple L-shaped plates (23) are arranged in an array and tilted on the outer side wall of the annular support seat (22). The end of the L-shaped plate (23) away from the annular support seat (22) is comb-shaped. The cleaning assembly also includes an annular groove (24) formed on the annular support base (22). The annular groove (24) has multiple arrayed wedge-shaped protrusions (241) on its sidewall. The support shaft (21) has multiple sliding grooves (211) inside. A wedge-shaped slider (212) adapted to the wedge-shaped protrusions (241) is slidably fitted in the sliding groove (211). A return spring (213) is provided between the wedge-shaped slider (212) and the bottom of the sliding groove (211). When the conveyor net (123) passes through the cleaning assembly, the comb teeth of the L-shaped plate (23) pass through the mesh and pull the conveyor net (123). The conveyor net (123) shakes under the cooperation of the wedge-shaped protrusions (241), the wedge-shaped slider (212) and the return spring (213). The support shaft (21) is also provided with an impurity removal component. The impurity removal component includes a support rod (25) fixed on the support shaft (21). The support rod (25) is provided with a sleeve (251) on the outside. The outer wall of the sleeve (251) is provided with a plurality of fan-shaped grooves. An electromagnet (253) is embedded in the fan-shaped groove. When the sludge on the conveyor belt below is transported to the area below the electromagnet (253), the electromagnet (253) removes the magnetic impurities in the sludge. The impurity removal assembly also includes multiple conductive posts (254) fixed to the inner wall of the sleeve (251). The number and position of the conductive posts (254) correspond one-to-one with the electromagnets (253). An annular conductive plate (255) with which the conductive posts (254) slide is fixed on the support rod (25). The annular conductive plate (255) has a notch. When the conductive post (254) contacts the annular conductive plate (255), the corresponding electromagnet (253) is energized and becomes magnetic. When the conductive post (254) is at the notch of the annular conductive plate (255), the corresponding electromagnet (253) is de-energized.

2. The sludge drying device with high-energy ball milling function according to claim 1, characterized in that, The top of the drying chamber (12) is provided with a feed inlet (1201) and an exhaust outlet (1200). A pair of forming rollers (1202) are provided in the feed inlet (1201). The forming rollers (1202) are driven by a forming motor (1203). After the sludge enters the feed inlet (1201), it is squeezed and formed by the forming rollers (1202) and falls onto the conveyor belt above.

3. A sludge drying device with high-energy ball milling function according to claim 2, characterized in that, The conveyor belt described above has a first receiving hopper (1204) at its conveying end. The first receiving hopper (1204) has a pair of cutting rollers (1205) inside. The cutting rollers (1205) are driven by a cutting motor (1206). The sludge on the conveyor belt above falls into the first receiving hopper (1204), is cut into strips, and then falls onto the conveyor belt below.

4. A sludge drying device with high-energy ball milling function according to claim 2, characterized in that, The conveyor belt described below has a second receiving hopper (1207) at its conveying end. The discharge port of the second receiving hopper (1207) is connected to the feed port of the ball mill cylinder (141) through a feeding pipe (1208).

5. A sludge drying device with high-energy ball milling function according to claim 1, characterized in that, The box (1) has a collection frame (26) on its side wall and a guide plate (27) is provided in the drying chamber (12) at an incline. After the electromagnet (253) is de-energized, the magnetic impurities adsorbed on it fall onto the guide plate (27) under the action of gravity and then slide into the collection frame (26).

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