Environment-friendly circulating drying device for sludge drying

Abstract

The application discloses an environment-friendly circulating drying device for sludge drying, and relates to the technical field of sludge drying treatment. The device comprises a base, a feeding device for transporting sludge is fixedly arranged on the top surface of the base, a drying box body is fixedly arranged on the top surface of the base, an auxiliary box body is fixedly arranged on the top surface of the base, a storage box is arranged in the auxiliary box body, a discharging mechanism arranged in the auxiliary box body is fixedly arranged on one side of the storage box, a heat pump dehumidification module is fixedly arranged in the drying box body, a slitting machine is arranged in the drying box body, a conveying device is arranged in the drying box body, an air deflector for guiding airflow is arranged in the heat pump dehumidification module, an auxiliary mechanism for changing the direction of the air deflector is arranged in the drying box body, and rollers for crushing sludge shells are arranged in the auxiliary mechanism. The rollers are reciprocatingly horizontally moved and rotated, can effectively pierce a layer of dense hard shell formed by sludge surface rapid water loss in the initial drying stage, and thus accelerate the drying process.

Description

Technical Field

[0001] This application relates to the technical field of sludge drying and treatment, and in particular to an environmentally friendly circulating drying device for sludge drying. Background Technology

[0002] Sludge refers to solid sediment produced by water and wastewater treatment processes. In order to protect the environment and prevent sludge from polluting the environment, the harmless treatment of sludge currently involves many steps. However, the first step is to dry the sludge to remove most of the water. In the process of drying sludge, it is usually necessary to use appropriate drying equipment.

[0003] In practical applications, during the sludge drying process of wide mesh belts, the airflow direction delivered by the traditional static air supply method is fixed and cannot be dynamically adjusted. Due to the large area of ​​the wide mesh belt, the airflow in a fixed direction cannot fully cover the entire mesh belt area, which will lead to situations where the airflow is too high in some areas and too low in others during the propagation process, thus forming "drying dead zones". This results in uneven moisture content of the entire batch of sludge, which seriously affects the uniformity and stability of the product. In addition, when the static airflow penetrates the sludge layer, its laminar flow characteristics result in poor stripping effect on the saturated air layer on the sludge surface. Utility Model Content

[0004] To address the issue of fixed airflow direction in traditional methods, this application provides an environmentally friendly circulating drying device for sludge drying.

[0005] This application provides an environmentally friendly circulating drying device for sludge drying, which adopts the following technical solution: An environmentally friendly circulating drying device for sludge drying includes a base, a feeding device for transporting wet sludge to be treated fixed on the top surface of the base, a drying chamber fixed on the top surface of the base, an auxiliary chamber fixed on the top surface of the base and connected to the drying chamber, a storage box inside the auxiliary chamber, a discharge mechanism through the auxiliary chamber fixed on one side of the storage box, a heat pump dehumidification module inside the drying chamber, a strip cutter inside the drying chamber, a conveying device inside the drying chamber, a guide plate inside the heat pump dehumidification module for guiding the drying airflow, an auxiliary mechanism inside the drying chamber for changing the airflow direction of the guide plate, and rollers inside the auxiliary mechanism for crushing the sludge shell.

[0006] By adopting the above technical solutions, the base is the basic support structure of the entire device, providing an installation platform for all other components and ensuring the stability and integrity of the equipment. The feeding device is responsible for continuously, stably, and controllably transporting the wet sludge to be treated to the subsequent drying section, which is the starting point of the automated process. The drying chamber is the sealed space of the core drying process, providing an efficient heat and mass exchange environment for hot air and sludge, and preventing heat loss and pollutant leakage. The auxiliary chamber, as a functional extension of the drying chamber, mainly provides installation space for discharge and some mechanisms, realizing the functional zoning of the equipment and making the structure more compact. The storage box is used to collect and temporarily store the final product (dry sludge) after drying, which is convenient for centralized processing and transfer. The function of the discharge mechanism is to effectively peel the dried sludge from the transport device and transport it to the storage box, ensuring smooth discharge and avoiding blockage. The heat pump dehumidification module achieves dehumidification and reheating of the drying air through the cycle of evaporator condensation dehumidification and condenser heating, thereby significantly reducing the energy consumption of the drying process. The function of the strip cutter is to cut large pieces of dewatered sludge into uniform strips, significantly increasing the specific surface area of ​​the sludge and creating the necessary conditions for efficient and uniform drying. The function of the conveying device is to support the sludge strips and ensure that they pass smoothly and continuously through the entire drying area, ensuring the continuity of the drying process. The air guide plate is used to guide and distribute the airflow, ensuring that the hot air can pass through the sludge layer evenly and avoiding uneven drying caused by dead airflow. The function of the auxiliary mechanism is to drive the air guide plate to swing periodically, dynamically changing the airflow direction, thereby further enhancing the uniformity of the airflow and breaking the static air boundary layer on the sludge surface, improving the conveying efficiency. The roller is the final actuator. On the one hand, it moves laterally back and forth with the nut, and on the other hand, it rotates on its own due to the meshing of gear one and rack one. This compound motion allows the roller to roll the sludge strips across the entire width of the mesh belt. The protrusions on its surface can effectively break the hard shell on the sludge surface, increase the heat exchange area, and prevent adhesion.

[0007] Preferably, the transport device includes a fixed frame fixedly installed inside the drying chamber, a mesh belt one is driven to the inside of the fixed frame, a mesh belt two is driven to the inside of the fixed frame, and one side of the mesh belt two is located inside the auxiliary chamber.

[0008] By adopting the above technical solution, the fixed frame serves as the installation skeleton and support structure of the entire transportation device, ensuring the correct positioning and stable operation of the mesh belt system in the drying box. Mesh belt one constitutes the main drying zone, where the sludge receives the main drying effect of hot air. Its porous structure allows hot air to penetrate the sludge layer from bottom to top. Mesh belt two usually serves as a cooling section or conveying section, sending the basically dried sludge to the auxiliary box and unloading it by the discharge mechanism, thus realizing the separation of the drying and discharge areas.

[0009] Preferably, the auxiliary mechanism includes a connecting frame, a motor is fixed inside the connecting frame, a bevel gear set is fixed at the output end of the motor, and a rotating column is fixed on one side of the bevel gear set.

[0010] By adopting the above technical solution, the connecting frame serves as the load-bearing shell of the motion module, providing protection and support for the internal transmission components. The motor provides the power source for the entire auxiliary mechanism. The bevel gear set is used to change the direction of power transmission, transmitting the rotational motion of the motor to the required position. The rotating column is used to transmit power from inside the connecting frame to the protective frame on the side of the drying chamber.

[0011] Preferably, a protective frame is fixedly provided on one side of the fixed frame, and a bevel gear set two is rotatably provided inside the protective frame one and fixed to the rotating column one. A reciprocating screw one is rotatably provided inside the protective frame one on one side of the bevel gear set two, and a nut is slidably provided on the outer surface of the reciprocating screw one. A driving device is provided on the outer surface of the nut.

[0012] By adopting the above technical solution, the protective frame one is used to protect the internal transmission components and prevent sludge and dust from entering and affecting the operation. The bevel gear set two changes the power transmission direction again, converting the rotational motion of the rotating column one into the rotational motion required by the reciprocating screw one. The core function of the reciprocating screw one is to convert the rotational motion into the linear reciprocating motion of the nut. The nut, as the actuator of the reciprocating motion, moves linearly reciprocally with the rotation of the reciprocating screw. The drive device is used to realize the rotation of the roller.

[0013] Preferably, the driving device includes a rack, and a gear is rotatably disposed on the outer surface of the nut, which meshes with the rack. One side of the gear is fixedly disposed with a roller, and the roller is slidably disposed inside the fixed frame.

[0014] By adopting the above technical solution, rack 1 serves as a fixed toothed track. When the nut carries gear 1 in a linear reciprocating motion along rack 1, gear 1 will be forced to rotate.

[0015] Preferably, a second rotating column is fixedly provided on the side of the first bevel gear set away from the first rotating column, and a third bevel gear set is fixedly provided on one side of the second rotating column.

[0016] By adopting the above technical solution, the rotating column two is used to transmit the power of the motor to the air guide plate swing mechanism on the other side at the same time, so as to realize the single motor drive two sets of functions, and the bevel gear set three is used to convert the power direction of the rotating column two to the reciprocating screw two.

[0017] Preferably, a protective frame two is fixedly provided inside the connecting frame one, and a reciprocating screw two fixedly provided with the bevel gear set three is rotatably provided inside the protective frame two, and a moving plate is slidably provided on the outer surface of the reciprocating screw two.

[0018] By adopting the above technical solution, the second protective frame is used to protect components such as the second reciprocating lead screw. The second reciprocating lead screw is used to convert the rotational motion into the linear reciprocating motion of the moving plate, and the moving plate is used as the output component of the linear reciprocating motion.

[0019] Preferably, a protective frame three is fixedly provided on one side of the connecting frame one, and a rack two fixedly connected to the moving plate is slidably provided inside the protective frame three. A plurality of gear two meshing with the rack two are rotatably connected inside the connecting frame one, and the gear two is fixedly connected to the air guide plate.

[0020] By adopting the above technical solution, the protective frame three protects the internal gear and rack transmission components. The moving plate drives rack two to perform linear reciprocating motion. The linear reciprocating motion of rack two drives all meshing gears two to perform forward and reverse reciprocating rotation. The reciprocating rotation of gear two directly drives all air guide plates to swing synchronously and periodically. This allows the dry airflow blown from the heat pump dehumidification module to be dynamically and evenly swept across the entire drying area, completely eliminating drying dead zones and enhancing airflow turbulence, greatly improving drying uniformity and efficiency.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. By using reciprocating horizontally moving and rotating rollers, and with several alloy needles fixed on the outer circumference of the rollers, the surface of the sludge can be effectively pierced to form a dense hard shell that will quickly lose water in the early stage of drying. This creates countless "microchannels" for the evaporation of internal moisture, which greatly increases the effective contact area between the sludge and the hot air, thereby improving the efficiency of moisture evaporation, significantly accelerating the drying process, and preventing the phenomenon of "dry outside and wet inside".

[0022] 2. With the help of the reciprocating oscillating air guide plate, the concentrated airflow can be dynamically and periodically swept across the entire width of the mesh belt, thereby effectively eliminating the "drying dead corners" caused by insufficient local airflow and ensuring the drying consistency of the entire bed of sludge. The air guide grooves on the surface of the air guide plate can "cut" a stream of airflow into multiple smaller streams of airflow with possible slight changes in direction. These smaller streams can generate a stronger turbulence effect when passing through the sludge layer, more effectively destroying the saturated air layer attached to the sludge surface, thereby greatly improving the efficiency of moisture being "taken away" from the sludge surface. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is another schematic diagram of the overall structure of this application; Figure 3 This is a schematic diagram of the internal structure of the drying chamber in this application; Figure 4 This is a schematic diagram of the internal structure of the connection frame in this application; Figure 5 This is a schematic diagram of the two-way connection structure of the reciprocating lead screw in this application.

[0024] Reference numerals: 1. Base; 2. Feeding device; 3. Drying chamber; 4. Auxiliary chamber; 5. Storage box; 6. Discharge mechanism; 7. Strip cutter; 8. Heat pump dehumidification module; 91. Mesh Belt One; 92. Mesh Belt Two; 93. Fixed Frame; 10. Auxiliary mechanism; 101. Connecting frame one; 102. Motor; 103. Bevel gear set one; 104. Rotating column one; 105. Protective frame one; 106. Bevel gear set two; 107. Reciprocating lead screw one; 108. Nut; 109. Gear 1; 110. Roller; 111. Rack 1; 112. Rotating column 2; 113. Bevel gear set 3; 114. Protective frame 2; 115. Reciprocating lead screw 2; 116. Moving plate; 117. Protective frame three; 118. Rack two; 119. Gear two; 11. Air guide plate. Detailed Implementation

[0025] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0026] This application discloses an environmentally friendly circulating drying device for sludge drying.

[0027] Reference Figure 1 — Figure 3An environmentally friendly circulating drying device for sludge drying includes a base 1, a feeding device 2 fixedly connected to the top surface of the base 1, a drying chamber 3 fixedly connected to the top surface of the base 1, a feeding port on the top surface of the drying chamber 3, and the discharge port of the feeding device 2 facing the feeding port of the drying chamber 3. An auxiliary chamber 4 is fixedly connected to the top surface of the base 1, and the auxiliary chamber 4 is fixedly connected to one side of the drying chamber 3. A storage box 5 is fixedly connected to the bottom surface of the inner wall of the auxiliary chamber 4, and one side of the storage box 5 is fixedly connected to... A discharge mechanism 6 is fixedly connected to the drying chamber 3, located on the side away from the drying chamber 3, and is fixedly connected to the auxiliary chamber 4. The feeding device 2 is an auger conveyor. A heat pump dehumidification module 8 is fixedly connected to the bottom surface of the inner wall of the drying chamber 3. The heat pump dehumidification module 8 contains an evaporator and a condenser. The top surface of the inner wall of the drying chamber 3 is fixedly connected to a strip cutter 7, which is located directly below the feed inlet of the drying chamber 3. A conveying device is installed inside the drying chamber 3. A guide plate 11 is rotatably connected to the top opening of the heat pump dehumidification module 8. The guide plate 11 is used to guide the drying airflow emitted by the heat pump dehumidification module 8. Several guide grooves are opened on the outer surface of the guide plate 11. An auxiliary mechanism 10 is installed inside the drying chamber 3 to change the guiding direction of the guide plate 11. The conveying device includes a fixed frame 93, which is fixedly connected to the inner wall of the drying chamber 3. A mesh belt 91 is drivenly connected to the top of the inner wall of the fixed frame 93. One side of belt 91 is located directly below the strip cutter 7 and is used to receive the sludge squeezed by the strip cutter 7. The bottom of the inner wall of the fixed frame 93 is connected to the mesh belt 92. The mesh belt 92 is located below the mesh belt 91. One side of the mesh belt 92 is used to receive the sludge that falls from the mesh belt 91. The other side of the mesh belt 92 is connected through the auxiliary box 4 and is located directly above the storage box 5. It is used to discharge the dried sludge into the storage box 5 and provides a discharge mechanism 6 for discharge.

[0028] In use, the sludge is cut into strips by the strip cutter 7 and spread on the top surface of the mesh belt 91. Then, the sludge is moved to the top surface of the mesh belt 92 by the transmission of the mesh belt 91. During the transmission process, the dry airflow released by the heat pump dehumidification module 8 passes through the sludge layer from bottom to top and takes away the moisture in it. After becoming medium temperature and high humidity, it first passes through the evaporator to cool and dehumidify, and discharges the condensate. Then, after being heated by the condenser, it enters the feeding device 2 to dry the sludge. The dried sludge is moved to the inside of the collection box 5 by the conveyor of the mesh belt 92 and is transported and collected by the discharge mechanism 6.

[0029] Reference Figure 3 — Figure 5The auxiliary mechanism 10 includes a connecting frame 101, which is fixedly connected to the upper part of the outer surface of the heat pump dehumidification module 8. The air guide plate 11 is parallel to the connecting frame 101. A motor 102 is fixedly mounted on the inner wall of the connecting frame 101 and is fixedly connected to the outer shell of the motor 102. A bevel gear set 103 is fixedly connected to the output end of the motor 102. The bevel gear set 103 is rotatably connected inside the connecting frame 101. The side of the fixed frame 93 is fixedly connected to the rotating column 104. One side of the fixed frame 93 is fixedly connected to the protective frame 105. The inner wall of the protective frame 105 is rotatably connected to the bevel gear set 106. The side of the rotating column 104 away from the bevel gear set 103 is fixedly connected to the bevel gear set 106. One side of the bevel gear set 106 is fixedly connected to the reciprocating screw 107. The reciprocating screw 107 is located on the side away from the rotating column 104 and is rotatably connected to... Inside the protective frame 105, a nut 108 is threaded onto the outer surface of the reciprocating screw 107. The nut 108 contains a ball bearing and a reversing mechanism. Two driving devices are located on the outer surface of the nut 108, one near the mesh belt 91 and the other near the mesh belt 92. These two driving devices are arranged in an L-shape. Each driving device includes a rack 111, which is fixed to the outer surface of the fixed frame 93 and located near the reciprocating screw 107. The outer surface of the nut 108 is rotatably connected to a gear 109, which meshes with the rack 111. The center of the gear 109 is fixedly connected to a roller 110, which is slidably connected inside the fixed frame 93. The two rollers 110 are located on the top surfaces of the mesh belts 91 and 92, respectively. A plurality of alloy needles are fixedly arranged in a circumferential array on the outer surface of the rollers 110.

[0030] In use, motor 102 drives bevel gear set 103 to rotate, bevel gear set 103 rotates, rotating column 104 rotates, rotating column 104 rotates, bevel gear set 2 106 fixedly connected to rotating column 104 rotates, bevel gear set 2 106 rotates, reciprocating screw 107 rotates, reciprocating screw 107 rotates, nut 108 reciprocates on the outer surface of reciprocating screw 107. When nut 108 moves, it drives gear 109 and roller 110 to move inside fixed frame 93. Since gear 109 is meshed with rack 111, roller 110 rotates when it moves. This effectively breaks the dense hard shell that forms on the surface of sludge when it loses water rapidly in the early stage of drying, creating countless "microchannels" for the evaporation of internal moisture. This greatly increases the effective contact area between sludge and hot air, thereby improving the efficiency of moisture evaporation, significantly accelerating the drying process, and preventing the phenomenon of "dry outside and wet inside".

[0031] Reference Figure 3 — Figure 5 One side of bevel gear set 103 is fixedly connected to rotating column 2 112. Rotating column 2 112 is located on the side away from rotating column 104 and is rotatably connected inside connecting frame 101. One side of rotating column 2 112 is fixedly connected to bevel gear set 3 113. Bevel gear set 3 113 is located on the side away from bevel gear set 103. The inner wall of connecting frame 101 is fixedly connected to protective frame 2 114. The inner wall of protective frame 2 114 is rotatably connected to reciprocating screw 2 115. One side of reciprocating screw 2 115 is fixedly connected to bevel gear set 3 113 and the outer surface of reciprocating screw 2 115 is... A movable plate 116 is threadedly connected. The movable plate 116 has a ball bearing and a reversing device inside. One side of the connecting frame 101 is fixedly connected to the protective frame 3 117. The protective frame 3 117 is located on one side of the heat pump dehumidification module 8, and the protective frame 3 117 is connected to the connecting frame 101 at a right angle. The inner wall of the protective frame 3 117 is slidably connected to the rack 2 118, and the rack 2 118 is fixedly connected to the eccentric part of the movable plate 116. The interior of the connecting frame 101 is rotatably connected to several gears 2 119, and the gears 2 119 are meshed with the rack 2 118. The gears 2 119 are fixedly connected to the air guide plate 11.

[0032] In use, the rotation of bevel gear set 103 drives the rotation of rotating column 112, which in turn drives the rotation of bevel gear set 113. The rotation of bevel gear set 113 drives the rotation of reciprocating screw 115, which in turn drives the moving plate 116 to reciprocate on the outer surface of reciprocating screw 115. This, in turn, drives rack 118 to move, which in turn drives gear 119 to rotate. This, in turn, drives the air guide plate 11 to deflect. With the help of the reciprocating air guide plate 11, the concentrated airflow can be dynamically and periodically swept across the entire width of the mesh belt, thereby effectively eliminating the "drying dead corners" caused by local low airflow and ensuring the drying consistency of the entire bed of sludge.

[0033] Among them, motor 102 is a DC geared motor, and the wiring of motor 102 is set inside the connecting frame 101; Several alloy needles are staggered and fixed on the outer surface of the roller 110, and the surface of the alloy needles is coated with polytetrafluoroethylene (Teflon) anti-stick coating, which can greatly reduce the adhesion of sludge. At the same time, a 'polyurethane elastic scraper plate' that is tightly attached to the surface of the roller 110 can be fixedly installed on one side of the track of the roller 110 reciprocating motion (on the fixed frame 93). When the roller 110 rotates, the scraper plate can automatically remove the sludge remaining in the gap between the alloy needles, realizing the self-cleaning function. After being cut into strips by the strip cutter 7, the sludge has a certain degree of stickiness and plasticity. When it is spread on the top surface of the mesh belt, it can be stacked and attached to the mesh belt to form a relatively stable structure. It will not easily fall out of the mesh. Mesh belt 1 91 and mesh belt 2 92 are high-strength engineering conveyor belts made of metal (such as stainless steel) woven or punched. Their mesh size allows hot air to pass through smoothly and is much smaller than the transverse size of the sludge strips.

[0034] The implementation principle of an environmentally friendly circulating drying device for sludge drying according to an embodiment of this application is as follows: During operation, the sludge is cut into strips by the strip cutter 7 and spread on the top surface of the mesh belt 91. Then, the sludge is moved to the top surface of the mesh belt 92 by the transmission of the mesh belt 91. During the transmission process, the dry airflow released by the heat pump dehumidification module 8 passes through the sludge layer from bottom to top and takes away the moisture in it. After becoming medium temperature and high humidity, the medium temperature and high humidity airflow enters the evaporator. In the evaporator, the low temperature and low pressure refrigerant absorbs the heat of the airflow and evaporates, which makes the temperature of the airflow decrease. As the temperature decreases, the water vapor in the airflow reaches a saturated state and condenses into small water droplets. These small water droplets are condensate, which is then discharged from the system, thus achieving the initial dehumidification of the airflow. After being processed by the evaporator, the airflow becomes a low-temperature and low-humidity airflow. However, the low temperature is not conducive to the subsequent drying of sludge. Then, the low-temperature and low-humidity airflow enters the condenser. In the condenser, the high-temperature and high-pressure refrigerant releases heat to the airflow, raising the temperature of the airflow and making it a high-temperature and dry airflow. Finally, the high-temperature and dry airflow enters the feeding device 2 and comes into contact with the sludge therein. The high-temperature airflow removes the moisture from the sludge, thereby achieving the purpose of drying the sludge. The dried sludge is conveyed by the mesh belt 2 92 and moved into the collection box 5, and is transported and collected by the discharge mechanism 6. As the sludge moves, motor 102 drives bevel gear set 103, rotating column 104, bevel gear set 2 106, and reciprocating screw 107 to rotate. The rotation of reciprocating screw 107 drives nut 108 to move back and forth. Since gear 109 is meshed with rack 111, roller 110 rotates during movement. This effectively breaks through the dense hard shell that forms on the surface of the sludge during the initial drying stage due to rapid water loss, increasing the effective contact area between the sludge and hot air, thereby improving the efficiency of water evaporation and significantly accelerating drying. In the process, the rotation of bevel gear set 103 drives the rotation of rotating column 112, bevel gear set 3 113, and reciprocating screw 115, which in turn drives the moving plate 116 to reciprocate, which in turn drives the rack 118 to move. The movement of rack 118 drives gear 119 to rotate, which in turn drives the air guide plate 11 to deflect. With the help of the reciprocating air guide plate 11, the concentrated airflow can be dynamically and periodically swept across the entire width of the mesh belt, thereby effectively eliminating the "drying dead corner" caused by the local low air volume and ensuring the drying consistency of the entire bed of sludge.

[0035] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An environmentally friendly circulating drying device for sludge drying, characterized in that: The system includes a base (1), a feeding device (2) for transporting wet sludge to be treated is fixed on the top surface of the base (1), a drying box (3) is fixed on the top surface of the base (1), an auxiliary box (4) is fixed on the top surface of the base (1) and is fixed to the drying box (3), a storage box (5) is provided inside the auxiliary box (4), a discharge mechanism (6) is fixed on one side of the storage box (5) and passes through the inside of the auxiliary box (4), a heat pump dehumidification module (8) is fixed inside the drying box (3), a strip cutter (7) is provided inside the drying box (3), a transport device is provided inside the drying box (3), a guide plate (11) for guiding the drying airflow is provided inside the heat pump dehumidification module (8), an auxiliary mechanism (10) for changing the direction of the airflow of the guide plate (11) is provided inside the drying box (3), and a roller (110) for crushing the sludge shell is provided inside the auxiliary mechanism (10).

2. The environmentally friendly circulating drying device for sludge drying according to claim 1, characterized in that: The transport device includes a fixed frame (93) fixedly installed inside the drying box (3), a mesh belt (91) is connected to the inside of the fixed frame (93) and a mesh belt (92) is connected to the inside of the fixed frame (93), and one side of the mesh belt (92) is located inside the auxiliary box (4).

3. The environmentally friendly circulating drying device for sludge drying according to claim 2, characterized in that: The auxiliary mechanism (10) includes a connecting frame (101), a motor (102) is fixed inside the connecting frame (101), a bevel gear set (103) is fixed at the output end of the motor (102), and a rotating column (104) is fixed on one side of the bevel gear set (103).

4. The environmentally friendly circulating drying device for sludge drying according to claim 3, characterized in that: A protective frame (105) is fixedly provided on one side of the fixed frame (93). Inside the protective frame (105), a bevel gear set (106) is rotatably provided and fixed to the rotating column (104). On one side of the bevel gear set (106), a reciprocating screw (107) is rotatably provided inside the protective frame (105). A nut (108) is slidably provided on the outer surface of the reciprocating screw (107). A driving device is provided on the outer surface of the nut (108).

5. The environmentally friendly circulating drying device for sludge drying according to claim 4, characterized in that: The driving device includes a rack (111), and a gear (109) is rotatably provided on the outer surface of the nut (108) and meshes with the rack (111). One side of the gear (109) is fixedly provided with a roller (110), and the roller (110) is slidably provided inside the fixed frame (93).

6. The environmentally friendly circulating drying device for sludge drying according to claim 3, characterized in that: A rotating column two (112) is fixedly installed on the side of the bevel gear set one (103) away from the rotating column one (104), and is rotatably connected inside the connecting frame one (101). A bevel gear set three (113) is fixedly installed on one side of the rotating column two (112).

7. The environmentally friendly circulating drying device for sludge drying according to claim 6, characterized in that: The connecting frame one (101) is fixedly provided with a protective frame two (114), and the protective frame two (114) is rotatably provided with a reciprocating screw two (115) fixedly provided with a bevel gear set three (113), and a moving plate (116) is slidably provided on the outer surface of the reciprocating screw two (115).

8. The environmentally friendly circulating drying device for sludge drying according to claim 7, characterized in that: A protective frame three (117) is fixedly provided on one side of the connecting frame one (101). A rack two (118) fixedly connected to the moving plate (116) is slidably provided inside the protective frame three (117). A plurality of gear two (119) meshing with the rack two (118) are rotatably connected inside the connecting frame one (101). The gear two (119) is fixedly connected to the air guide plate (11).

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