Multi-stage temperature control sanding device for asphalt waterproofing membrane production

Abstract

The application discloses a multistage temperature control sanding device for asphalt waterproof coiled material production, which comprises a rack, a preheating cover, a high-temperature cover, a medium-temperature cover and a low-temperature cover are bolted to the upper portion of the rack, and electric heaters are penetrated through the two sides of the preheating cover, the high-temperature cover, the medium-temperature cover and the low-temperature cover, the application is characterized in that a rotatable feeding pipe screening structure is integrated in the bunker, a main gear is driven by a servo motor to mesh with an external tooth ring to drive the feeding pipe to rotate, the screen holes uniformly distributed on the surface of the feeding pipe are used for dynamically screening the input sand materials, and the mixed large-diameter impurity particles in the sand materials can be effectively removed; meanwhile, a self-locking motor-driven discharging roller and a quantitative discharging structure with a through groove are matched, the sand materials can be controllably and uniformly discharged, the problems of the bunker and the discharging channel blockage caused by the absence of a screening mechanism in the traditional sanding device are solved, the equipment operation stability is improved, the continuous and efficient development of the sanding process of the asphalt waterproof coiled material is ensured, and the equipment downtime and maintenance frequency are reduced.

Description

Technical Field

[0001] This invention relates to the field of asphalt waterproof membrane production technology, and in particular to a multi-stage temperature-controlled sand spreading device for asphalt waterproof membrane production. Background Technology

[0002] Asphalt waterproof membrane is a rollable sheet waterproof material made of asphalt as the main waterproof base material, combined with reinforcing materials and auxiliary materials such as fillers and modifiers. It has good waterproof, seepage prevention, high and low temperature resistance and certain tensile properties. It is often laid on the surface of building structures such as roofs, basements, kitchens and bathrooms, and tunnels to isolate moisture and prevent rainwater and groundwater penetration. It is a widely used traditional waterproof material in the field of building waterproofing. In order to increase the aging resistance of asphalt waterproof membrane, sand spreading devices are now often used to spread sand on the asphalt waterproof membrane.

[0003] Existing sand-spreading devices have several drawbacks. First, the hopper lacks a sand and gravel screening mechanism, resulting in large-diameter particles mixed in with the sand. This easily leads to blockages in the hopper and discharge channel during operation, affecting continuous equipment operation. Second, after the sand-spreading operation, the surface asphalt of the roll material remains at a high temperature. The equipment lacks cooling components and relies solely on natural heat dissipation, resulting in a slow overall production cycle and reduced efficiency. Third, the equipment lacks a sand-laying detection mechanism, making it impossible for staff to determine the uniformity of sand distribution on the roll material surface in real time. This makes it difficult to promptly detect quality problems such as uneven sand spreading, sand leakage, and sand accumulation, easily leading to substandard quality of the finished waterproof roll material. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-stage temperature-controlled sand-spreading device for the production of asphalt waterproof membranes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a multi-stage temperature-controlled sand-spreading device for the production of asphalt waterproof membrane, comprising a frame, wherein a preheating cover, a high-temperature cover, a medium-temperature cover, and a low-temperature cover are bolted to the upper part of the frame, and electric heaters penetrate both sides of the preheating cover, the high-temperature cover, the medium-temperature cover, and the low-temperature cover; a material hopper is fixedly inserted through the upper part of the high-temperature cover; multiple sets of conveying rollers and multiple sets of hollow rollers are installed inside the frame via bearings; conveyor belts are sleeved on the side walls of the multiple sets of conveying rollers and the multiple sets of hollow rollers; and an installation cover is bolted to one side of the frame, and the installation cover... A drive motor is bolted to the surface of the hopper. A discharge roller is mounted inside the hopper via bearings, and a through groove is provided on the side wall of the discharge roller. A sealing cover and a cover are bolted to the side wall of the hopper. A self-locking motor is bolted to the surface of the cover. A feeding pipe passes through the hopper and the sealing cover via bearings, and an external toothed ring is fixedly sleeved on the side wall of one end of the feeding pipe. A servo motor is bolted to the surface of the sealing cover, and a main gear is fixedly sleeved on the output end of the servo motor. Multiple sets of screen holes are provided on the side wall of the feeding pipe, and sealing plugs are inserted into the inside of both ends of the feeding pipe.

[0006] As a further description of the above technical solution:

[0007] A cooling box is bolted to the lower part of the frame, and multiple sets of first connecting pipes run through one side of the cooling box. One end of each set of first connecting pipes is connected to one end of each set of hollow rollers via bearings. Multiple sets of pumps are bolted to the other side of the cooling box, and the output ends of each set of pumps are connected to second connecting pipes. One end of each set of second connecting pipes is connected to the other end of each set of hollow rollers via bearings. The input ends of each set of pumps are connected to third connecting pipes, and one end of each set of third connecting pipes is inserted into the interior of the cooling box. A cooler is inserted into the lower part of the cooling box, and solenoid valves are provided on the side walls of each set of first connecting pipes.

[0008] As a further description of the above technical solution:

[0009] The end face of the cooling box is provided with an inlet pipe and an outlet pipe, and control valves are provided on the side walls of both the inlet pipe and the outlet pipe.

[0010] As a further description of the above technical solution:

[0011] The upper part of the frame is bolted with two sets of mounting seats, and the opposing surfaces of the two sets of mounting seats are provided with limit grooves. I-shaped sliders and mounting screws slide through the interior of the two sets of limit grooves. A detection roller passes through the two sets of I-shaped sliders via a bearing. Mounting plates are welded to the opposing ends of the two sets of mounting screws. Infrared transmitters and infrared receivers are respectively provided on the opposing surfaces of the two sets of mounting plates. Two sets of mounting nuts are sleeved on the side walls of the two sets of mounting screws. An alarm and an electrical control box are bolted on the lower part of the frame.

[0012] As a further description of the above technical solution:

[0013] The electrical control box contains a controller and a battery. The controller is electrically connected to the battery, drive motor, eight sets of electric heaters, servo motor, cooler, multiple sets of pumps, infrared transmitter, infrared receiver, self-locking motor and alarm via wires.

[0014] As a further description of the above technical solution:

[0015] The two sets of mounting screws and the four sets of mounting nuts are threadedly engaged with each other.

[0016] As a further description of the above technical solution:

[0017] The gear meshes with the external gear ring.

[0018] As a further description of the above technical solution:

[0019] The multiple sets of conveying rollers and the multiple sets of hollow rollers are all located on the same horizontal plane.

[0020] As a further description of the above technical solution:

[0021] The output end of the self-locking motor is connected to one end of the feeding roller via a coupling.

[0022] As a further description of the above technical solution:

[0023] The output end of the drive motor is connected to the last set of conveyor rollers via a coupling.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. This invention integrates a rotatable feeding pipe screening structure inside the silo. A servo motor drives the main gear to mesh with the external gear ring, causing the feeding pipe to rotate. The feeding pipe is dynamically screened using screen holes evenly distributed on its surface, effectively removing large-diameter impurities mixed in with the sand. Simultaneously, it is equipped with a self-locking motor-driven discharge roller and a quantitative discharge structure with a through groove, achieving controllable and uniform sand discharge. This solves the problem of silo and discharge channel blockage caused by the lack of a screening mechanism in traditional sand spreading devices, improves equipment operational stability, ensures continuous and efficient operation of the asphalt waterproof membrane sand spreading process, and reduces the frequency of equipment downtime for maintenance.

[0026] 2. This invention adds an independent cooling box, a refrigerator, and a hollow roller circulating cooling system. Through a pump and multiple sets of connecting pipes, cooling water achieves closed-loop circulation within the hollow roller, continuously cooling the conveyor belt and the high-temperature asphalt waterproof membrane during transport. It abandons the traditional natural heat dissipation cooling mode, accelerating the cooling speed of the membrane after sand application, effectively shortening production waiting time, and improving overall production cycle and efficiency. Simultaneously, the uniform water cooling method avoids excessive local temperature differences in the membrane, ensuring the basic production quality of the membrane. Multiple sets of first, second, and third connecting pipes form a water circulation path, and the solenoid valves installed on the sidewalls of the first connecting pipes can precisely control the pipe opening and closing, ensuring stable operation of the cooling system.

[0027] 3. This invention features adjustable infrared detection components mounted on two sets of mounting seats on the upper part of the frame. Through the cooperation of an infrared transmitter and receiver, the distribution of sand on the surface of the waterproof membrane after sand spreading can be monitored in real time. Workers can use the detection data to determine the uniformity of sand spreading on the membrane surface in real time, accurately identifying uneven sand spreading. Combined with an alarm installed at the lower part of the frame, it can provide timely warnings of abnormalities, quickly identify and rectify production problems, effectively avoid the production of large quantities of substandard products, and significantly improve the pass rate and production quality stability of the asphalt waterproof membrane. The limiting groove, I-shaped slider, mounting screw, and mounting nut allow for flexible adjustment of the installation position and height of the detection roller and infrared detection components, adapting to different production conditions. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a multi-stage temperature-controlled sand-spreading device for the production of asphalt waterproof membrane proposed in this invention;

[0030] Figure 2 This is a schematic diagram of the frame structure proposed in this invention;

[0031] Figure 3 This is a schematic diagram of the structure of the detection roller proposed in this invention;

[0032] Figure 4 This is a schematic diagram of the feeding pipe proposed in this invention;

[0033] Figure 5 This is a schematic diagram of the structure of the feeding roller proposed in this invention;

[0034] Figure 6 The present invention proposes Figure 2 Enlarged view of A in the middle;

[0035] Figure 7 The present invention proposes Figure 3 Enlarged view of B in the middle;

[0036] Figure 8 The present invention proposes Figure 4 A magnified view of C.

[0037] Legend:

[0038] 1. Frame; 2. Preheating hood; 3. High-temperature hood; 4. Medium-temperature hood; 5. Low-temperature hood; 6. Hopper; 7. Conveyor roller; 8. Hollow roller; 9. Conveyor belt; 10. Mounting cover; 11. Drive motor; 12. Electric heater; 13. Sealing cover; 14. Feeding pipe; 15. Servo motor; 16. Gear; 17. External gear ring; 18. Screen hole; 19. Sealing plug; 20. Cooling box; 21. Refrigerator; 22. First connecting section 23. Connecting pipe; 24. Pump; 25. Second connecting pipe; 26. Third connecting pipe; 27. Mounting base; 28. Limiting through slot; 29. ​​I-shaped slider; 30. Mounting screw; 31. Detection roller; 32. Mounting plate; 33. Mounting nut; 34. Infrared transmitter; 35. Infrared receiver; 36. Feeding roller; 37. Cover; 38. Self-locking motor; 39. Through slot; 40. Water inlet pipe; 41. Water outlet pipe. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0040] In the description of the invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; furthermore, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can be internal connections between two elements. For those skilled in the art, the specific meaning of the above terms in the invention can be understood according to the specific circumstances:

[0041] Please refer to Figures 1 to 8 As shown,

[0042] A multi-stage temperature-controlled sand-spreading device for producing asphalt waterproof membrane includes a frame 1. A preheating cover 2, a high-temperature cover 3, a medium-temperature cover 4, and a low-temperature cover 5 are bolted to the upper part of the frame 1. These four types of covers are arranged sequentially along the membrane conveying direction. Electric heaters 12 are installed through both sides of each cover, and temperature control within the cover is achieved by the operation of the electric heaters 12. A material hopper 6 is fixedly installed through the upper part of the high-temperature cover 3. Multiple sets of conveyor rollers 7 and multiple sets of hollow rollers 8 are rotatably mounted inside the frame 1 via bearings. A conveyor belt 9 is connected to the outer sides of the conveyor rollers 7 and hollow rollers 8 to carry and convey the asphalt waterproof membrane. A mounting cover 10 is bolted to one side of the frame 1. A drive motor 11 is mounted on the outer side of the mounting cover 10 to provide power for the membrane conveying. A material hopper 6 is rotatably mounted inside the material hopper via bearings. A feeding roller 35 is provided, with a through groove 38 on its side wall for feeding sand. A sealing cover 13 and a cover 36 are bolted to the side wall of the hopper 6. A self-locking motor 37 is installed on the outside of the cover 36 to drive the feeding roller 35 to rotate. A feeding pipe 14 is installed between the hopper 6 and the sealing cover 13 through a bearing. An external toothed ring 17 is fixedly installed on the outside of one end of the feeding pipe 14. A servo motor 15 is installed on the outside of the sealing cover 13. A main gear 16 is fixedly installed at the output end of the servo motor 15. Multiple sets of screen holes 18 are evenly opened on the wall of the feeding pipe 14 to screen and filter the sand. Sealing plugs 19 are inserted into the inside of both ends of the feeding pipe 14 to ensure the overall sealing of the feeding pipe 14 during operation and prevent sand leakage and dust overflow.

[0043] Please refer to Figure 1 , Figure 2 and Figure 6As shown, a cooling box 20 is fixedly installed on the lower part of the frame 1 by bolts. Multiple sets of first connecting pipes 22 are connected through one side of the cooling box 20. The ends of each first connecting pipe 22 are connected to one end of each set of hollow rollers 8 through bearings. Multiple sets of pumps 23 are bolted on the other side of the cooling box 20. The output end of the pumps 23 is snapped with a second connecting pipe 24. The ends of each set of second connecting pipes 24 are connected to the other end of each set of hollow rollers 8 through bearings. The input end of the pumps 23 is snapped with a third connecting pipe 25. The end of the third connecting pipe 25 is inserted into the interior of the cooling box 20 to form a complete water circulation and conveying path. A refrigerator 21 is inserted into the lower part of the cooling box 20 to cool and lower the water inside the cooling box 20. Each set of first connecting pipes 22 is equipped with a solenoid valve. The solenoid valve controls the on / off state of the pipeline, thereby regulating the start / stop and operation of the cooling cycle, and realizing continuous heat exchange and cooling of the hollow rollers 8 and the roll material above the conveyor belt 9.

[0044] Please refer to Figure 2 As shown, an inlet pipe 39 and an outlet pipe 40 pass through the end face of the cooling box 20. Control valves are installed on the side walls of both the inlet pipe 39 and the outlet pipe 40. The inlet pipe 39 and the outlet pipe 40 respectively complete the water replenishment and drainage operations inside the cooling box 20. The flow rate and on / off status of the inlet and outlet water can be independently adjusted by the control valves, which makes it convenient for staff to replace, replenish and circulate the cooling water according to production needs, and ensure that the cooling water inside the cooling box 20 always maintains a suitable cooling working state.

[0045] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 7 As shown, two sets of mounting seats 26 are symmetrically bolted to the upper part of the frame 1. Limiting grooves 27 are opened on the inner sides of the two sets of mounting seats 26. I-shaped sliders 28 and mounting screws 29 are slidably installed inside the limiting grooves 27. The two sets of I-shaped sliders 28 are connected by bearings to rotate and install detection rollers 30. The detection rollers 30 can slide up and down inside the limiting grooves 27 with the I-shaped sliders 28 to adjust their height, adapting to the detection of roll materials of different thicknesses. Mounting plates 31 are welded to the opposite ends of the two sets of mounting screws 29. Infrared transmitters 33 and infrared receivers 34 are respectively installed on the inner sides of the two mounting plates 31. The two work together to complete the detection of sand thickness and laying uniformity. Multiple sets of mounting nuts 32 are sleeved on the outer side of the mounting screws 29. The mounting plates 31 can be locked in place by the thread engagement between the nuts and the screws. An alarm and an electrical control box are bolted to the lower part of the frame 1. The alarm is used for audible and visual warning when abnormalities are detected, and the electrical control box is used for integrated control of the electrical components of the whole machine.

[0046] Please refer to Figure 1 and Figure 2As shown, the electrical control box contains a controller and a battery. The controller is electrically connected to the battery, drive motor 11, eight sets of electric heaters 12, servo motor 15, cooler 21, multiple pumps 23, infrared transmitter 33, infrared receiver 34, self-locking motor 37, and alarm via wires. The controller's control circuit can be implemented by simple programming by those skilled in the art and is common knowledge in the field. It is only used and not modified, so the control method and circuit connection will not be described in detail.

[0047] Please refer to Figure 7 As shown, two sets of mounting screws 29 and four sets of mounting nuts 32 are threadedly engaged with each other; the mounting nuts 32 can rotate and move along the axial direction of the mounting screws 29, and the mounting position of the mounting plate 31 can be locked by tightening or loosening the nuts. The spacing and height of the mounting plates 31 can also be flexibly adjusted to adapt to the detection requirements of different specifications of roll materials, and ensure the installation stability and adjustment flexibility of the infrared detection structure.

[0048] Please refer to Figure 8 As shown, gear 16 meshes with external gear ring 17; when servo motor 15 is working, it drives main gear 16 to rotate, and through gear meshing transmission, it drives external gear ring 17 and the overall feeding pipe 14 to rotate synchronously. Relying on the rotational motion of feeding pipe 14 to cooperate with screen hole 18, the dynamic screening operation of sand is completed, and the stable transmission operation of the screening structure is realized.

[0049] Please refer to Figure 1 and Figure 2 As shown, multiple sets of conveyor rollers 7 and multiple sets of hollow rollers 8 are all located on the same horizontal plane; this allows the conveyor belt 9, which is sleeved on the outside, to maintain a horizontal and stable conveying state, avoiding problems such as tilting, jamming, and deviation of the conveyor belt 9, ensuring a smooth conveying process of asphalt waterproof membrane, and providing a stable working foundation for processes such as sand spreading, temperature control, and testing.

[0050] Please refer to Figure 5 As shown, the output end of the self-locking motor 37 is connected to one end of the feeding roller 35 via a coupling. When the self-locking motor 37 is working, it can stably drive the feeding roller 35 to rotate via the coupling. The sand is evenly released by the through groove 38 on the side wall of the feeding roller 35. At the same time, the self-locking motor 37 can be stopped and locked, and the start, stop and rotation angle of the feeding roller 35 can be precisely controlled to ensure that the amount of sand spread is uniform and controllable.

[0051] Please refer to Figure 1 As shown, the output end of the drive motor 11 is connected to the last set of conveyor rollers 7 via a coupling; after the drive motor 11 starts, it can drive the set of conveyor rollers 7 to rotate. Relying on the linkage transmission between each set of conveyor rollers 7 and the hollow roller 8, the conveyor belt 9 is driven to run at a uniform speed, so as to realize the continuous and stable conveying operation of the asphalt waterproof membrane.

[0052] Working Principle: When this multi-stage temperature-controlled sand-spreading device for asphalt waterproofing membrane production is in operation, the equipment is first started via the controller in the electrical control box. The battery inside the control box powers all the electrical components of the machine, driving the motor 11 to rotate the conveyor roller 7 inside the frame 1. This, in conjunction with the hollow roller 8, drives the conveyor belt 9 to run at a uniform speed, achieving continuous conveying of the asphalt waterproofing membrane. During the membrane conveying process, the preheating cover 2, high-temperature cover 3, medium-temperature cover 4, and low-temperature cover 5, sequentially arranged on the upper part of the frame 1, achieve multi-stage segmented temperature control through electric heaters 12 running through both sides. This provides gradient temperature control for the conveyed membrane, ensuring the appropriate construction temperature for the asphalt layer and providing a good foundation for the sand-spreading operation. Simultaneously, the servo motor 15 starts, driving the main gear 16 to rotate. Through the meshing transmission between the main gear 16 and the external gear ring 17, the feeding pipe 14 inside the hopper 6 rotates. The sand fed into the hopper 6 rotates with the feeding pipe 14 and passes through the sieve holes 18 for dynamic screening, removing large-diameter impurities. The sealing plugs 19 inserted at both ends of the feeding pipe 14 ensure the sealing of the screening structure. The qualified sand after screening is stored inside the hopper 6. The self-locking motor 37 on the surface of the cover 36 drives the feeding roller 35 to operate. The sand is quantitatively and evenly dropped through the through groove 38 on the side wall of the feeding roller 35, so that the sand is stably laid on the surface of the temperature-controlled asphalt waterproof membrane, completing the sand spreading process. After the sand spreading is completed, the membrane continues to be conveyed by the conveyor belt 9. The cooler 21 inside the cooling box 20 cools the water in the box. Multiple pumps 23 draw cooling water through the third connecting pipe 25, and form a closed-loop water circulation through the second connecting pipe 24, the hollow roller 8, and the first connecting pipe 22. The low temperature cooling water continuously flows through the hollow roller 8, which cools the high temperature membrane conveyed above in all directions and accelerates the curing and shaping of the membrane asphalt layer. The water inlet pipe 39 and the water outlet pipe 40 penetrating the end face of the cooling box 20 can complete water replenishment and water replacement maintenance. The pipeline solenoid valve precisely controls the opening and closing of the cooling pipeline.During the cooling and conveying process of the roll material, the I-shaped slider 28 and the mounting screw 29 inside the limiting groove 27 of the mounting base 26 can flexibly adjust the position and height of the detection roller 30 and the mounting plate 31 to adapt to the detection requirements of different specifications of roll materials and preset sand laying thickness. During operation, the detection roller 30 rolls against the surface of the asphalt waterproof roll material, and monitors the sand laying thickness on the surface of the roll material in real time. When sand accumulates on the surface of the roll material and the sand thickness exceeds the preset standard thickness, the excessive sand will push the detection roller 30 upward. The displaced detection roller 30 can block the infrared light emitted by the infrared emitter 33. The infrared receiver 34 was unable to receive infrared signals properly due to a faulty wire. The controller detected the signal abnormality in real time and immediately triggered the alarm, accurately reporting the quality problem of excessive sand application. This alerted staff to adjust equipment parameters and troubleshoot the fault. All electrical components of the machine are uniformly controlled by the controller inside the electrical control box. Through the coordinated operation of multi-level temperature control, screening anti-blocking, circulating cooling, and online thickness detection and early warning, the entire process of temperature control, sand application, cooling, and quality inspection of asphalt waterproof membrane is continuously completed, achieving efficient, high-quality, and continuous production of membrane sand application.

[0053] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-stage temperature-controlled sand-spreading device for the production of asphalt waterproof membrane, comprising a frame (1), characterized in that, The upper part of the frame (1) is bolted with a preheating cover (2), a high temperature cover (3), a medium temperature cover (4), and a low temperature cover (5). Electric heaters (12) are installed through both sides of the preheating cover (2), the high temperature cover (3), the medium temperature cover (4), and the low temperature cover (5). A hopper (6) is fixedly installed through the upper part of the high temperature cover (3). Multiple sets of conveying rollers (7) and multiple sets of hollow rollers (8) are installed inside the frame (1) through bearings. Conveyor belts (9) are sleeved on the side walls of the multiple sets of conveying rollers (7) and the multiple sets of hollow rollers (8). A mounting cover (10) is bolted to one side of the frame (1), and a drive motor (11) is bolted to the surface of the mounting cover (10). A discharge device is installed inside the hopper (6) through bearings. The roller (35) has a through groove (38) on its side wall. The side wall of the hopper (6) is bolted with a sealing cover (13) and a cover (36). The surface of the cover (36) is bolted with a self-locking motor (37). The hopper (6) and the sealing cover (13) are connected by a feeding pipe (14) through a bearing. One end of the feeding pipe (14) is fixedly sleeved with an external toothed ring (17). The surface of the sealing cover (13) is bolted with a servo motor (15). The output end of the servo motor (15) is fixedly sleeved with a main gear (16). The side wall of the feeding pipe (14) has multiple sets of screen holes (18). Both ends of the feeding pipe (14) are inserted with sealing plugs (19).

2. The multi-stage temperature-controlled sand-spreading device for producing asphalt waterproof membrane according to claim 1, characterized in that, A cooling box (20) is bolted to the lower part of the frame (1), and multiple sets of first connecting pipes (22) pass through one side of the cooling box (20). One end of the multiple sets of first connecting pipes (22) is connected to one end of multiple sets of hollow rollers (8) through bearings. Multiple sets of pumps (23) are bolted to the other side of the cooling box (20), and the output end of the multiple sets of pumps (23) is clamped with a second connecting pipe (24). One end of the multiple sets of second connecting pipes (24) is connected to the other end of the multiple sets of hollow rollers (8) through bearings. The input end of the multiple sets of pumps (23) is clamped with a third connecting pipe (25). One end of the multiple sets of third connecting pipes (25) is inserted into the interior of the cooling box (20). A cooler (21) is inserted into the lower part of the cooling box (20). Solenoid valves are provided on the side walls of the multiple sets of first connecting pipes (22).

3. The multi-stage temperature-controlled sand-spreading device for producing asphalt waterproof membrane according to claim 2, characterized in that, The end face of the cooling box (20) is provided with an inlet pipe (39) and an outlet pipe (40), and control valves are provided on the side walls of the inlet pipe (39) and the outlet pipe (40).

4. The multi-stage temperature-controlled sand-spreading device for producing asphalt waterproof membrane according to claim 2, characterized in that, The upper part of the frame (1) is bolted with two sets of mounting seats (26), and the opposing surfaces of the two sets of mounting seats (26) are provided with limit slots (27). The interior of the two sets of limit slots (27) is slidably penetrated by I-shaped sliders (28) and mounting screws (29). The two sets of I-shaped sliders (28) are connected by bearings through a detection roller (30). The opposing ends of the two sets of mounting screws (29) are welded with mounting plates (31). The opposing surfaces of the two sets of mounting plates (31) are respectively provided with infrared transmitters (33) and infrared receivers (34). The side walls of the two sets of mounting screws (29) are fitted with two sets of mounting nuts (32). The lower part of the frame (1) is bolted with an alarm and an electrical control box.

5. A multi-stage temperature-controlled sand-spreading device for producing asphalt waterproof membrane according to claim 4, characterized in that, The electrical control box contains a controller and a battery. The controller is electrically connected to the battery, drive motor (11), eight sets of electric heaters (12), servo motor (15), cooler (21), multiple sets of pumps (23), infrared transmitter (33), infrared receiver (34), self-locking motor (37) and alarm via wires.

6. A multi-stage temperature-controlled sand-spreading device for producing asphalt waterproof membrane according to claim 4, characterized in that, The two sets of mounting screws (29) and the four sets of mounting nuts (32) are threadedly engaged with each other.

7. The multi-stage temperature-controlled sand-spreading device for producing asphalt waterproof membrane according to claim 1, characterized in that, The gear (16) meshes with the external gear ring (17).

8. The multi-stage temperature-controlled sand-spreading device for producing asphalt waterproof membrane according to claim 1, characterized in that, The multiple sets of conveying rollers (7) and the multiple sets of hollow rollers (8) are all located on the same horizontal plane.

9. A multi-stage temperature-controlled sand-spreading device for producing asphalt waterproof membrane according to claim 1, characterized in that, The output end of the self-locking motor (37) is connected to one end of the feeding roller (35) via a coupling.

10. A multi-stage temperature-controlled sand-spreading device for producing asphalt waterproof membrane according to claim 1, characterized in that, The output end of the drive motor (11) is connected to the last set of conveying rollers (7) via a coupling.

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