A secondary coating device for asphalt waterproof coiled materials

Abstract

The present invention relates to the technical field of asphalt waterproof roll production equipment, and discloses a secondary coating device for asphalt waterproof rolls, which includes a drying device and a coating device arranged in sequence. The drying device includes two drying rollers arranged at a distance and independently driven respectively, namely a first drying roller with heat and a second drying roller; the coating device includes a coating pool for containing and / or receiving asphalt and a double straight-row extrusion forming mechanism arranged above the coating pool. The double straight-row extrusion forming mechanism includes two pairs of paired extrusion rollers arranged at a distance and having heat, namely a first upper extrusion roller and a first lower extrusion roller for rough pressing and a second upper extrusion roller and a second lower extrusion roller for fine pressing. The rotation speed of the first upper extrusion roller is greater than that of the second upper extrusion roller. The present invention adopts a combination of drying and coating, and through the improvement of the multi-drying device and the coating device, makes the two more adaptable, thereby promoting the improvement of the quality of the finished waterproof roll.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt waterproofing coiled material production equipment, and more specifically, to a secondary coating equipment for asphalt waterproofing coiled material. Background Art

[0002] Asphalt waterproofing membrane refers to a roll of material made of asphalt material, tire material and anti-sticking material on the surface, also known as linoleum, which is often used for post-type waterproofing layer. Asphalt waterproofing membrane includes tire-coated membrane and tireless membrane. Any roll material made of thick paper or glass fiber cloth, asbestos cloth, cotton and linen fabrics and other tire materials impregnated with petroleum asphalt is called tire-coated membrane; the roll material made by mixing asbestos, rubber powder, etc. into asphalt materials and rolling them is called roller-pressed membrane, that is, tireless membrane.

[0003] Modified asphalt waterproofing membrane is commonly known as modified asphalt felt. It is a rollable sheet-like waterproofing material made of glass fiber felt, polyester felt, jute cloth, polyethylene film, polyester non-woven fabric, metal foil or two composite materials as the base, synthetic polymer modified asphalt with a dosage of not less than 10% and oxidized asphalt as the dipping material, and powdered, flaky, granular mineral materials, synthetic polymer film, and metal film as the covering material. Due to the inherent disadvantages of asphalt itself, such as low softening point, high penetration and low-temperature brittleness, the scope of use is limited when it is used as a waterproofing material. After adding polymer modification to asphalt, the above properties are greatly improved, and its weather resistance, temperature sensitivity (high temperature characteristics, low temperature flexibility), and adaptability to substrate cracking have been significantly improved. The waterproofing material made of this modified asphalt has entered the industrialized era of "light, thin, short, and small" from the past era of "heavy, thick, long, and large".

[0004] Whether it is unmodified asphalt waterproofing membrane or modified asphalt waterproofing membrane, they all belong to asphalt waterproofing membrane. The production process of this type of waterproofing membrane is usually to dip asphalt on the base fabric such as non-woven fabric, and then squeeze the base fabric dipped in asphalt to compact the asphalt on the base fabric. During production, it needs to go through two processes: pre-impregnation and coating. The role of pre-impregnation is to soak the asphalt used for pre-impregnation into the base fabric to ensure that the base fabric can be completely soaked with asphalt, so as to avoid water leakage and stratification of the finished product after it encounters water. After pre-impregnation, it is often necessary to dry it before coating. The drying effect affects both the effect of pre-impregnation and the success or failure of coating. In order to avoid the deformation of the pre-impregnated base due to pulling, the existing technology generally adopts the method of hanging drying or blowing to dry it, and the drying effect of this drying method is often unsatisfactory. On the one hand, coating is to achieve a certain thickness requirement, and more importantly, to finally obtain a tight and uniform waterproofing membrane. However, the tightness and uniformity of the waterproofing membrane produced by the existing coating device are unsatisfactory, which affects the service life of the waterproofing membrane. Therefore, it is necessary to improve the existing dry coating device. Summary of the invention

[0005] In view of this, in order to overcome at least one of the shortcomings of the above-mentioned prior art, the present invention provides a secondary coating equipment for asphalt waterproof membrane to solve the contradiction between drying effect and pulling deformation and the problem of difficulty in achieving the expected effect of coating.

[0006] In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

[0007] A secondary coating device for asphalt waterproofing coiled material comprises a drying device and a coating device arranged in sequence, wherein the drying device comprises two drying rollers arranged at a distance from each other and driven independently, namely a first drying roller and a second drying roller with heat; the coating device comprises a coating pool for containing and / or receiving asphalt and a double straight-row extrusion molding mechanism arranged above the coating pool, wherein the double straight-row extrusion molding mechanism comprises two pairs of extrusion rollers arranged in pairs at a distance from each other and with heat, namely a first upper extrusion roller and a first lower extrusion roller for rough pressing and a second upper extrusion roller and a second lower extrusion roller for fine pressing, wherein the rotation speed of the first upper extrusion roller is greater than that of the second upper extrusion roller.

[0008] According to the production process of asphalt waterproofing coiled material, the present invention provides a set of asphalt waterproofing coiled material secondary coating equipment for the drying coating process after pre-impregnation with asphalt, which can effectively improve the quality of the finished waterproofing coiled material, including a drying device and a coating device arranged in sequence. The drying device is mainly composed of two independently driven drying rollers arranged at a distance, and the two drying rollers are driven by different driving mechanisms respectively. Even if the viscosity is greatly increased at high temperature, the waterproofing coiled material will not be stretched and deformed. On the one hand, such an arrangement avoids the two drying rollers from pulling the waterproofing coiled material between the two, and on the other hand, it is equivalent to providing a tension buffer zone for the waterproofing coiled material before and after drying during the drying stage, thereby effectively preventing the waterproofing coiled material from being continuously stretched and deformed during the production process. In addition, the present invention abandons the traditional air-drying method and adopts contact drying, which greatly improves the drying effect. The coating device adopts a double straight-row extrusion molding mechanism. Each extrusion roller has heat. While extruding, it further softens the asphalt at the contact point, allowing it to squeeze out the air and fill the gaps faster to prevent the generation of bubbles. The waterproof membrane is roughly pressed under the extrusion action of the first upper extrusion roller and the first lower extrusion roller with a larger rotation speed. The waterproof membrane is finely pressed under the extrusion action of the second upper extrusion roller and the second lower extrusion roller with a relatively smaller rotation speed. The combination of the rough pressing and fine pressing processes improves the tightness and uniformity of the extrusion. Similarly, the double straight-row extrusion molding mechanism continues the design concept of the drying device, which can greatly reduce the probability of deformation while improving the delay uniformity.

[0009] The rotational speed of the first upper extrusion roller is greater than that of the first lower extrusion roller, and the rotational speed of the second upper extrusion roller is less than that of the second lower extrusion roller. A speed difference is formed between the upper and lower extrusion rollers, so that the first upper extrusion roller levels the upper surface of the waterproof coiled material, and the second upper extrusion roller compacts the upper surface of the waterproof coiled material. During leveling, a certain degree of compaction is achieved, and during compaction, a certain degree of leveling is also achieved, further improving the tightness and uniformity of the waterproof coiled material. The rotational speeds of the first lower extrusion roller and the second lower extrusion roller are basically the same, maintaining their continuous compaction effect on the lower surface of the waterproof coiled material. Each of the extrusion rollers is driven by four high-torque servo motors.

[0010] At the contact between the extrusion roller and the waterproof coiled material, the linear velocity direction of the first upper extrusion roller is the same as the moving direction of the waterproof coiled material, the linear velocity direction of the first lower extrusion roller is opposite to the moving direction of the waterproof coiled material, the linear velocity direction of the second upper extrusion roller is the same as the moving direction of the waterproof coiled material, and the linear velocity direction of the second lower extrusion roller is opposite to the moving direction of the waterproof coiled material. In other words, the rotation directions of all the extrusion rollers are the same. The upper extrusion roller forms a frictional force consistent with the direction of the waterproof coiled material at the contact with the waterproof coiled material, pushing the waterproof coiled material forward; the lower extrusion roller forms a frictional force opposite to the direction of the waterproof coiled material at the contact with the waterproof coiled material, achieving a certain leveling effect while compaction.

[0011] The distance between the two pairs of extrusion rollers is not greater than 60 cm. A too large distance is not conducive to compaction at a suitable temperature, nor is it conducive to maintaining the continuity of rough compaction and fine compaction, and is not conducive to exerting their synergistic effect.

[0012] Each of the extrusion rollers is connected to be lifted above the coating pool through a ball screw transmission mechanism to control the thickness of the waterproof coiled material. The ball screw transmission mechanism has high precision, which is conducive to the precise control of the thickness of the waterproof coiled material.

[0013] The length of the extrusion roller is generally large. Due to the action of gravity or pressure, an extrusion roller with a certain length is prone to a certain degree of deformation, which will cause the defect that the middle of the waterproof coiled material is thick and the two sides are thin. Therefore, the extrusion roller is preferably designed with a structure in which the diameter of the middle part is larger than that of the two ends.

[0014] The coating device further includes an immersion roller arranged in the coating pool or capable of being lifted and lowered into the coating pool, mainly for coating asphalt on the lower surface of the waterproof coiled material. The immersion roller is located between the pool wall of the coating pool and the double straight-row extrusion forming mechanism. A guiding roller is also arranged between the immersion roller and the pool wall of the coating pool to prevent the waterproof coiled material from touching the pool wall of the coating pool and even scratching the asphalt pre-impregnated in the previous process.

[0015] A waterfall feeding mechanism is also provided on the feeding side of the double straight-line extrusion forming mechanism to evenly spread asphalt on the upper surface of the waterproof coil. A waterfall feeding mechanism is provided on the feeding side of each pair of extrusion rollers to coat the upper surface of the waterproof coil with asphalt before extrusion, ensuring that it has sufficient thickness and tightness.

[0016] Both the drying roller and the extrusion roller are sandwich oil-passing rollers through which heat-conducting oil flows. The temperature of the heat-conducting oil in the drying roller is 190 - 220 °C; the temperature of the heat-conducting oil in the extrusion roller is 220 °C, and the surface temperature of the roller is 170 - 190 °C. The drying roller and the extrusion roller are designed with a sandwich oil-passing structure, and heat is provided to the drying roller by means of heating with heat-conducting oil, so that the temperature of the drying roller will not change suddenly and the change amount will not be too large, effectively avoiding damaging the waterproof coil or even causing a fire.

[0017] The wrapping rate of each drying roller is not less than 75%. A higher wrapping rate can provide more drying area, improve the drying efficiency and the utilization rate of the drying roller, reduce the span of the equipment, and thus save space; more importantly, a higher wrapping rate is beneficial to maintaining the temperature balance of the heat-conducting oil in the drying roller, avoiding deformation of the drying roller caused by thermal expansion and contraction, and improving the service life of the equipment.

[0018] The angle between the common plane where the rotation axes of the first drying roller and the second drying roller are located and the horizontal plane is 60° - 80°; the drying device is also provided with two drying guide rollers respectively arranged at a distance from the first drying roller and the second drying roller to ensure that the wrapping rate of the drying roller is not less than 75%.

[0019] The drying device also includes bounce frames arranged on both sides to further prevent the waterproof coil from being stretched and play a buffering role. The bounce frame includes a guide rail, a bounce roller slidably connected to the guide rail, a spring buffer device arranged below the bounce roller, and a gravity block that weights the bounce roller through a sprocket mechanism.

[0020] Each drying roller is driven by a variable-frequency motor to further prevent the waterproof coil from being stretched.

[0021] The present invention has the following beneficial effects compared with the prior art: The present invention adopts a combination of drying and coating. Through the improvement of multiple drying devices and coating devices, the two are made more adaptable, thereby promoting the improvement of the quality of finished waterproof coiled materials. The present invention abandons the traditional air drying method and adopts contact drying, which greatly improves the drying effect. The drying device is mainly composed of two independently driven drying rollers arranged at a distance. The two drying rollers are respectively driven by different driving mechanisms, and even when the viscosity is greatly increased at high temperatures, the waterproof coiled material will not be stretched and deformed. The coating device adopts a double straight row extrusion forming mechanism. Each extrusion roller has heat. While extruding, it further softens the asphalt at the contact point to make it extrude air and fill the gaps faster, preventing the generation of bubbles. Under the extrusion action of the first upper extrusion roller and the first lower extrusion roller with a relatively high rotation speed, rough pressing of the waterproof coiled material is achieved. Under the extrusion action of the second upper extrusion roller and the second lower extrusion roller with a relatively low rotation speed, fine pressing of the waterproof coiled material is achieved. By combining the two processes of rough pressing and fine pressing, the tightness and uniformity of extrusion are improved. Similarly, the double straight row extrusion forming mechanism continues the design concept of the drying device, which can greatly reduce the probability of deformation while improving the delay uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of a secondary coating device for asphalt waterproof coiled materials.

[0023] Figure 2 is a schematic structural diagram of the drying device.

[0024] Figure 3 is a schematic structural diagram of the coating device.

[0025] Figure 4 is a schematic operation diagram of the double straight row extrusion forming mechanism.

[0026] DESCRIPTION OF THE REFERENCE NUMERALS: Drying device 100, first drying roller 111, second drying roller 112, drying guide roller 113, bouncing frame 120, guide rail 121, bouncing roller 122, spring buffer device 123, coating device 200, coating tank 210, first upper extrusion roller 221, first lower extrusion roller 222, second upper extrusion roller 223, second lower extrusion roller 224, dipping roller 231, guide roller 232, waterfall type feeding mechanism 240, deviation rectifying device 300. DETAILED DESCRIPTION OF THE INVENTION

[0027] The accompanying drawings are only for illustrative purposes and should not be construed as limiting the present invention; for better illustration of this embodiment, some components in the drawings will be omitted, enlarged or reduced, which does not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted; the terms used to describe the positional relationship in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. The present invention will be further described in detail below with reference to specific embodiments.

[0028] As Figure 1 shown, a secondary coating device for asphalt waterproof coiled materials includes a drying device 100, a deviation rectifying device 300 and a coating device 200 arranged in sequence.

[0029] As Figure 2 shown, the drying device 100 includes two drying rollers and bounce frames 120 arranged on both sides. The two drying rollers are arranged at a distance, independently driven and have heat. The drying rollers are sandwich oil-passing rollers, through which heat-conducting oil passes, and the temperature of the heat-conducting oil is 190 - 220 °C. The wrapping rate of each drying roller is not less than 75%. A higher wrapping rate can provide more drying area, improve the drying efficiency and the utilization rate of the drying rollers, reduce the span of the device, thus saving space; more importantly, a higher wrapping rate is beneficial to maintaining the temperature balance of the heat-conducting oil in the drying rollers, avoiding deformation of the drying rollers caused by thermal expansion and contraction, and improving the service life of the device. The two drying rollers are respectively a first drying roller 111 and a second drying roller 112 with heat; the angle between the common plane where the rotation axes of the first drying roller 111 and the second drying roller 112 are located and the horizontal plane is 60° - 80°; the drying device 100 is also provided with two drying guide rollers 113 respectively arranged at a distance from the first drying roller 111 and the second drying roller 112 to ensure that the wrapping rate of the drying rollers is not less than 75%. The bounce frame 120 includes a guide rail 121, a bounce roller 122 slidably connected to the guide rail, a spring buffer device 123 arranged below the bounce roller, and a gravity block that weights the bounce roller through a sprocket mechanism, further preventing the waterproof coiled material from being stretched and playing a buffering role.

[0030] As Figure 3 shown, the coating device 200 includes a coating pool 210, a double straight row extrusion forming mechanism arranged above the coating pool 210, an immersion roller 231 arranged in the coating pool 210 or capable of being lifted into the coating pool 210, and a waterfall feeding mechanism 240 arranged on the feeding side of the double straight row extrusion forming mechanism. The coating pool 210 is used for containing and / or receiving asphalt. The double straight row extrusion forming mechanism includes two pairs of paired extrusion rollers arranged at a distance and having heat. The extrusion rollers are sandwich oil-passing rollers, through which heat-conducting oil passes, and the temperature of the heat-conducting oil is 220 °C, and the roller surface temperature is 170 - 190 °C. As Figure 4As shown, the two pairs of squeeze rollers are respectively a first upper squeeze roller 221 and a first lower squeeze roller 222 for rough pressing and a second upper squeeze roller 223 and a second lower squeeze roller 224 for fine pressing. The rotation speed of the first upper squeeze roller 221 is greater than that of the second upper squeeze roller 223. The rotation speed of the first upper squeeze roller 221 is v 11 The rotation speed v of the first lower squeezing roller 222 is 12 The rotation speed v of the second upper squeezing roller 223 is large. 21 The rotation speed v of the second lower squeezing roller 224 is 22 The rotation speed v of the first lower squeezing roller 222 is small. 12 The rotation speed v of the second lower squeezing roller 224 22 Basically keep the same; at the contact point between the squeezing roller and the waterproof coiled material, the linear speed direction of the first upper squeezing roller 221 is the same as the moving direction of the waterproof coiled material, the linear speed direction of the first lower squeezing roller 222 is opposite to the moving direction of the waterproof coiled material, the linear speed direction of the second upper squeezing roller 223 is the same as the moving direction of the waterproof coiled material, and the linear speed direction of the second lower squeezing roller 224 is opposite to the moving direction of the waterproof coiled material. The distance between the two pairs of squeezing rollers is not more than 60cm. Too large a distance is not conducive to completing compaction at a suitable temperature, nor is it conducive to maintaining the continuity of rough pressing and fine pressing, and is not conducive to exerting the synergistic effect of the two. Each of the squeezing rollers is respectively connected to the coating pool 210 through a ball screw transmission mechanism to achieve thickness control of the waterproof coiled material. The ball screw transmission mechanism has a high precision and is conducive to accurate control of the thickness of the waterproof coiled material. The length of the squeezing roller is generally large. The squeezing roller with a certain length is prone to a certain degree of deformation due to gravity or pressure, which will cause the waterproof coiled material to be thick in the middle and thin on both sides. For this reason, the squeezing roller is preferably designed to have a structure with a middle diameter larger than the diameter at both ends. The dipping roller 231 is mainly used to coat the lower surface of the waterproof coiled material with asphalt. The dipping roller 231 is located between the wall of the coating pool 210 and the double straight-row extrusion molding mechanism. A guide roller 232 is also provided between the dipping roller 231 and the wall of the coating pool 210 to prevent the waterproof coiled material from touching the wall of the coating pool 210 or even scratching the asphalt pre-impregnated in the previous process. The waterfall-type unloading mechanism 240 is used to evenly spread asphalt on the upper surface of the waterproof coiled material. The feed side of each pair of extrusion rollers is provided with a waterfall-type unloading mechanism 240, which coats the upper surface of the waterproof coiled material with asphalt before extrusion to ensure that it has sufficient thickness and tightness.

[0031] According to the production process of asphalt waterproofing coiled material, this embodiment provides a set of asphalt waterproofing coiled material secondary coating equipment for the drying coating process after pre-impregnation with asphalt, which effectively improves the quality of the finished waterproofing coiled material, including a drying device 100 and a coating device 200 arranged in sequence. The drying device 100 is mainly composed of two independently driven drying rollers arranged at a distance, and the two drying rollers are driven by different driving mechanisms respectively. Even if the viscosity is greatly increased at high temperature, the waterproofing coiled material will not be stretched and deformed. Such a setting, on the one hand, avoids the two drying rollers from pulling the waterproofing coiled material between the two, and on the other hand, is equivalent to providing a tension buffer zone for the waterproofing coiled material before and after drying during the drying stage, thereby effectively preventing the waterproofing coiled material from being continuously stretched and deformed during the production process. In addition, the present invention abandons the traditional air-drying method and adopts contact drying, which greatly improves the drying effect. The coating device 200 adopts a double straight-row extrusion molding mechanism, and each extrusion roller has heat. While extruding, the asphalt at the contact point is further softened to squeeze out the air faster and fill the gaps to prevent the generation of bubbles. The waterproof membrane is roughly pressed under the extrusion action of the first upper extrusion roller 221 and the first lower extrusion roller 222 with a larger rotation speed, and the waterproof membrane is finely pressed under the extrusion action of the second upper extrusion roller 223 and the second lower extrusion roller 224 with a relatively smaller rotation speed. The tightness and uniformity of the extrusion are improved by combining the two processes of rough pressing and fine pressing. Similarly, the double straight-row extrusion molding mechanism continues the design concept of the drying device 100, which can greatly reduce the probability of deformation while improving the uniformity of delay.

[0032] Combination Figure 4 The speed of the first upper squeeze roller 221 is greater than that of the first lower squeeze roller 222, and the speed of the second upper squeeze roller 223 is less than that of the second lower squeeze roller 224. A speed difference is formed between the upper and lower squeeze rollers, so that the first upper squeeze roller 221 has a flattening effect on the upper surface of the waterproof coiled material, and the second upper squeeze roller 223 has a compacting effect on the upper surface of the waterproof coiled material. The flattening has a certain degree of compaction, and the compaction also has a certain degree of flattening, so that the tightness and uniformity of the waterproof coiled material are further improved. The speed of the first lower squeeze roller 222 is basically the same as that of the second lower squeeze roller 224, so that they maintain their continuous compaction effect on the lower surface of the waterproof coiled material. Each of the squeeze rollers is driven by four high-torque servo motors.

[0033] Combination Figure 4, at the contact between the extrusion rollers and the waterproof coiled material, the linear velocity direction of the first upper extrusion roller 221 is the same as the moving direction of the waterproof coiled material, the linear velocity direction of the first lower extrusion roller 222 is opposite to the moving direction of the waterproof coiled material, the linear velocity direction of the second upper extrusion roller 223 is the same as the moving direction of the waterproof coiled material, and the linear velocity direction of the second lower extrusion roller 224 is opposite to the moving direction of the waterproof coiled material. In other words, the rotation directions of all the extrusion rollers are kept consistent. The upper extrusion roller forms a frictional force consistent with the walking direction of the waterproof coiled material at the contact with the waterproof coiled material to push the waterproof coiled material forward; the lower extrusion roller forms a frictional force opposite to the walking direction of the waterproof coiled material at the contact with the waterproof coiled material to form a certain scraping and leveling effect while compacting.

[0034] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A secondary coating device for asphalt waterproofing membranes, characterized in that, It includes a drying device and a coating device arranged in sequence. The drying device includes two drying rollers arranged at a distance and independently driven respectively, namely a first drying roller with heat and a second drying roller; the coating device includes a coating pool for containing and / or receiving asphalt and a double straight-row extrusion forming mechanism arranged above the coating pool. The double straight-row extrusion forming mechanism includes two pairs of paired extrusion rollers arranged at a distance and having heat, namely a first upper extrusion roller and a first lower extrusion roller for rough pressing and a second upper extrusion roller and a second lower extrusion roller for fine pressing. The rotation speed of the first upper extrusion roller is greater than that of the second upper extrusion roller. The rotation speed of the first upper extrusion roller is greater than that of the first lower extrusion roller. The rotation speed of the second upper extrusion roller is less than that of the second lower extrusion roller. The rotation speed of the first lower extrusion roller is equal to that of the second lower extrusion roller.

2. The secondary coating equipment for asphalt waterproof coiled materials according to claim 1, characterized in that, At the contact position between the extrusion roller and the waterproof coiled material, the linear velocity direction of the first upper extrusion roller is the same as the moving direction of the waterproof coiled material. The linear velocity direction of the first lower extrusion roller is opposite to the moving direction of the waterproof coiled material. The linear velocity direction of the second upper extrusion roller is the same as the moving direction of the waterproof coiled material. The linear velocity direction of the second lower extrusion roller is opposite to the moving direction of the waterproof coiled material.

3. The secondary coating equipment for asphalt waterproof coiled material according to claim 1, characterized in that The distance between the two pairs of extrusion rollers is not greater than 60 cm.

4. The secondary coating equipment for asphalt waterproof coiled material according to claim 1, characterized in that Each of the extrusion rollers is connected by a ball screw drive mechanism to be lifted above the coating pool so as to control the thickness of the waterproof coiled material.

5. The secondary coating equipment for asphalt waterproof coiled materials according to any one of claims 1 to 3, characterized in that, Both the drying roller and the extrusion roller are sandwich oil-through rollers with heat transfer oil passing through them. The temperature of the heat transfer oil in the drying roller is 190 - 220 °C. The temperature of the heat transfer oil in the extrusion roller is 220 °C, and the roller surface temperature is 170 - 190 °C.

6. The secondary coating equipment for asphalt waterproofing membranes according to any one of claims 1 to 3, characterized in that, The wrapping rate of each drying roller is not less than 75%.

7. The secondary coating device for asphalt waterproof coiled materials according to any one of claims 1 to 3, characterized in that, The drying device further includes bounce frames arranged on both sides.

8. The secondary coating equipment for asphalt waterproof coiled materials according to any one of claims 1 to 3, characterized in that, Each of the drying rollers is driven by a variable-frequency motor.

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