Special pipe for extracting polyurethane waterproof paint

Abstract

The invention relates to the technical field of polyurethane coatings, in particular to a special pipe for extracting polyurethane waterproof coatings, which comprises a conveying pipe and a cleaning assembly, the conveying pipe comprises a main pipe and an auxiliary pipe; the cleaning assembly comprises an air pump, a three-way valve, a motor, a connecting line and a spherical air bag. The maintenance port is provided with a connector, the air pump comprises an air outlet connected with the connector, and the connector is communicated with the interior of the auxiliary pipe through a three-way valve; one end of the airflow channel is communicated with the three-way valve, and the other end of the airflow channel is communicated with the spherical air bag; the air pump pressurizes the interiors of the auxiliary pipe and the main pipe, through cooperation of the air pump and the three-way valve, air flows into the auxiliary pipe to generate pressure difference to push the spherical air bag to move, then residual polyurethane in the main pipe is squeezed out, and the efficiency is higher while the squeezing-out effect is guaranteed; and through the connecting wire and the motor, the connecting wire can be used as an air pipe and also can be used as a stay wire.

Description

Technical Field

[0001] The present invention relates to the technical field of polyurethane coatings, and particularly relates to a special pipe for extracting polyurethane waterproof coatings. Background Art

[0002] Polyurethane coatings are a relatively common type of coatings, which can be divided into two-component polyurethane coatings and one-component polyurethane coatings. Two-component polyurethane coatings generally consist of an isocyanate prepolymer (also called a low-molecular urethane polymer) and a hydroxyl-containing resin, and are usually referred to as the curing agent component and the main agent component. There are many varieties of this type of coatings, and the application range is also very wide. According to the different hydroxyl-containing components, they can be divided into acrylic polyurethane, alkyd polyurethane, polyester polyurethane, polyether polyurethane, epoxy polyurethane and other varieties. Generally, they have good mechanical properties, a relatively high solid content, and good performance in all aspects. They are a type of coatings with great development potential. The main application directions include wood coatings, automotive refinish coatings, anti-corrosion coatings, floor paints, electronic coatings, special coatings, polyurethane waterproof coatings, etc.

[0003] In the prior art, the coatings remaining in the pipeline after the extraction of polyurethane waterproof coatings are prone to curing. After long-term repeated curing, the internal diameter of the pipeline gradually decreases, causing inconvenience in use. Therefore, it is necessary to design a special pipe for extracting polyurethane waterproof coatings that is convenient for discharging materials. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide a special pipe for extracting polyurethane waterproof coatings that is convenient for discharging materials.

[0005] To solve the above technical problem, the technical solution adopted by the present invention is: A special pipe for extracting polyurethane waterproof coatings, comprising a conveying pipe and a cleaning component; The conveying pipe includes a main pipe and a sub-pipe with the same diameter. The main pipe includes a feeding end and a discharging end. One end of the sub-pipe is communicated with the side wall of the main pipe at the feeding end through a first valve, and the other end is a maintenance port; a second valve is arranged on the feeding end, and the inner walls of the main pipe and the sub-pipe are polished; The cleaning component includes an air pump, a three-way valve, a motor, a connecting wire and a spherical airbag; an interface and a deflation port are arranged on the maintenance port. The air pump includes an air outlet connected to the interface, and the interface and the inside of the sub-pipe are communicated through the three-way valve; an air flow channel is arranged in the connecting wire, one end of the air flow channel is communicated with the three-way valve, and the other end is communicated with the spherical airbag; the motor and the spherical airbag are arranged in the sub-pipe in a staggered manner, and the spherical airbag is arranged on the side close to the first valve; When there is residual polyurethane waterproof coating in the main pipe, close the second valve and the air vent, open the first valve and the air pump. At the same time, the three-way valve connects the air pump to the air flow channel to inflate the spherical airbag so that the outer periphery of the spherical airbag fits against the inner wall of the auxiliary pipe. When the inflation is completed, the three-way valve is connected to the inside of the auxiliary pipe, and the air pressure generated by the air pump squeezes the spherical airbag into the main pipe. The air pump continues to work under pressure to push the spherical airbag from the feeding end to the discharging end, thereby achieving extrusion. After the extrusion is completed, the air pump stops working, the air vent is opened for deflation, and the three-way valve controls the air flow channel to be connected to the inside of the auxiliary pipe for synchronous deflation. After the deflation is completed, the motor rotates to roll up the connecting wire to pull the deflated spherical airbag back into the auxiliary pipe, close the first valve, and at the same time close the air vent.

[0006] Preferably, after the deflation is completed and a predetermined time is paused, the motor rotates to roll up the connecting wire to pull the deflated spherical airbag back into the auxiliary pipe, close the first valve, and at the same time close the air vent.

[0007] Preferably, after the deflation is completed, the air pump rotates in reverse and the three-way valve connects the interface and the air flow channel to quickly contract the spherical airbag. After a predetermined time of contraction, the motor rotates to roll up the connecting wire to pull the deflated spherical airbag back into the auxiliary pipe, close the first valve, and at the same time close the air vent.

[0008] Preferably, the maintenance port is a detachable structure.

[0009] Preferably, a heater is provided inside the air pump; Before the special pipe for transporting the polyurethane waterproof coating is used, start the air pump and the heater, open the first valve, close the second valve and the air vent at the same time, and the three-way valve connects the interface and the inside of the auxiliary pipe; the hot air flow blown in heats the inside of the main pipe and the auxiliary pipe to melt the solidified polyurethane waterproof coating in the spherical airbag, the main pipe, and the auxiliary pipe, and part of it is melted and blown out.

[0010] Preferably, when there is residual polyurethane waterproof coating in the main pipe, close the second valve and the air vent, open the first valve, the air pump, and the heater. At the same time, the three-way valve connects the air pump to the air flow channel to inflate the spherical airbag so that the outer periphery of the spherical airbag fits against the inner wall of the auxiliary pipe.

[0011] Preferably, the conveying motor includes a rotating shaft and a wire reel. The conveying wire reel is arranged on the rotating shaft, and the conveying connecting wire is wound around the wire reel.

[0012] Preferably, an arc-shaped block is provided on the side wall of the main pipe opposite to the auxiliary pipe, and the arc-shaped block fits against the inflated spherical airbag.

[0013] Preferably, the cleaning assembly further includes a filter, and the air pump further includes an air inlet, and the filter is connected to the air inlet.

[0014] Preferably, the air pump is fixed on the outer side wall of the main pipe.

[0015] The beneficial effects of the present invention are as follows: By using a spherical airbag in cooperation with the inner wall of the auxiliary pipe inside the polished main pipe, the spherical airbag will not fail during cleaning. Since the second valve and one end of the auxiliary pipe are arranged on the side wall of the main pipe at the feeding end, the moving direction of the spherical airbag can only move towards the discharging end after entering the main pipe. Then, by pressurizing the auxiliary pipe and the main pipe with an air pump, and through the cooperation of the air pump and the three-way valve, the gas flows into the auxiliary pipe to generate a pressure difference to push the movement of the spherical airbag, thereby realizing the extrusion of the residual polyurethane in the main pipe, ensuring a better extrusion effect and higher efficiency. With the spherical airbag and the main pipe and auxiliary pipe of the same diameter, the spherical airbag only needs to be inflated once, without the need to repeatedly inflate or deflate to adapt to different pipe diameters, further improving the working efficiency. The spherical structure can fully fit the inner walls of the main pipe and the auxiliary pipe. Through the connecting line and the motor, the connecting line can be used both as an air pipe and as a pulling wire, serving two purposes at once. And deflation is carried out at the discharging end. Since the surface area of the spherical airbag shrinks, the liquid polyurethane can also gather together more quickly and then drip, reducing the loss of polyurethane. The pulling back of the motor can realize the next cleaning. When using the special pipe for extracting polyurethane waterproof coating, a special delivery pump is connected to the feeding end to pump the polyurethane waterproof coating in and then discharge it from the discharging end. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. is a schematic diagram of the initial state of a special pipe for extracting polyurethane waterproof coating according to a specific embodiment of the present invention; Figure 2 FIG. is a schematic diagram of the inflated state of the spherical airbag of a special pipe for extracting polyurethane waterproof coating according to a specific embodiment of the present invention; Figure 3 FIG. is a schematic diagram of the spherical airbag of a special pipe for extracting polyurethane waterproof coating being extruded into the main pipe from the auxiliary pipe by air pressure according to a specific embodiment of the present invention; Figure 4 FIG. is a schematic diagram of the working state of the spherical airbag in the main pipe of a special pipe for extracting polyurethane waterproof coating according to a specific embodiment of the present invention; Figure 5 FIG. is a schematic diagram of the deflated state of the spherical airbag of a special pipe for extracting polyurethane waterproof coating according to a specific embodiment of the present invention; Figure 6 FIG. is a schematic diagram of the motor pulling back after the spherical airbag of a special pipe for extracting polyurethane waterproof coating is deflated according to a specific embodiment of the present invention; Description of reference numerals: 1. Delivery pipe; 11. Main pipe; 111. Feed end; 112. Discharge end; 113. First valve; 12. Sub-pipe; 121. Maintenance port; 122. Second valve; 123. Interface; 124. Air release port; 13. Arc-shaped stopper; 2. Cleaning assembly; 21. Air pump; 22. Three-way valve; 23. Motor; 24. Connecting wire; 25. Spherical airbag; 26. Wire reel. Detailed implementation

[0017] To describe in detail the technical content, achieved objectives and effects of the present invention, the following is described in conjunction with the implementation manners and with reference to the drawings.

[0018] Please refer to Figures 1 to 6 , a special pipe for extracting polyurethane waterproof coating, comprising a delivery pipe 1 and a cleaning assembly 2; The delivery pipe 1 includes a main pipe 11 and a sub-pipe 12 of the same diameter. The main pipe 11 includes a feed end 111 and a discharge end 112. One end of the sub-pipe 12 communicates with the side wall of the main pipe 11 at the feed end 111 through a first valve 113, and the other end is a maintenance port 121; a second valve 122 is provided at the feed end 111, and the inner walls of the main pipe 11 and the sub-pipe 12 are polished. The cleaning assembly 2 includes an air pump 21, a three-way valve 22, a motor 23, a connecting wire 24 and a spherical airbag 25; an interface 123 and an air release port 124 are provided on the maintenance port 121. The air pump 21 includes an air outlet connected to the interface 123, and the interface 123 and the inside of the sub-pipe 12 are connected through the three-way valve 22; an air flow channel is provided inside the connecting wire 24, one end of the air flow channel is connected to the three-way valve 22, and the other end is connected to the spherical airbag 25; the motor 23 and the spherical airbag 25 are arranged offset in the sub-pipe 12, and the spherical airbag 25 is arranged on the side close to the first valve 113. When there is residual polyurethane waterproof coating in the main pipe 11, the second valve 122 and the air release port 124 are closed, the first valve 113 and the air pump 21 are opened. At the same time, the three-way valve 22 connects the air pump 21 with the air flow channel to inflate the spherical airbag 25 so that the outer periphery of the spherical airbag 25 fits against the inner wall of the sub-pipe 12; after inflation is completed, the three-way valve 22 communicates with the inside of the sub-pipe 12, and the air pressure generated by the air pump 21 squeezes the spherical airbag 25 into the main pipe 11. The air pump 21 continues to work under pressure to push the spherical airbag 25 from the feed end 111 to the discharge end 112, thereby achieving extrusion; after extrusion is completed, the air pump 21 stops working, the air release port 124 is opened for air release, the three-way valve 22 controls the air flow channel to communicate with the inside of the sub-pipe 12 for synchronous air release. After air release is completed, the motor 23 rotates to wind up the connecting wire 24 to pull the deflated spherical airbag 25 back into the sub-pipe 12, close the first valve 113 and at the same time close the air release port 124.

[0019] As can be seen from the above description, by using the spherical airbag 25 in cooperation with the inner wall of the auxiliary pipe 12 in the polished main pipe 11, the failure of the spherical airbag 25 will not be caused during cleaning. By arranging the second valve 122 and one end of the auxiliary pipe 12 on the side wall of the main pipe 11 at the feeding end 111, the moving direction of the spherical airbag 25 can only move towards the discharging end 112 after entering the main pipe 11. Then, by pressurizing the auxiliary pipe 12 and the main pipe 11 with the air pump 21, and through the cooperation of the air pump 21 and the three-way valve 22, the gas flows into the interior of the auxiliary pipe 12 to generate a pressure difference to push the movement of the spherical airbag 25, thereby realizing the extrusion of the residual polyurethane in the main pipe 11, ensuring a better extrusion effect and higher efficiency. By using the spherical airbag 25 with the main pipe 11 and the auxiliary pipe 12 of the same diameter, the spherical airbag 25 only needs to be inflated once, without the need to repeatedly inflate or deflate to adapt to different pipe diameters, further improving the working efficiency. The spherical structure can completely fit the inner walls of the main pipe 11 and the auxiliary pipe 12. Through the connecting line 24 and the motor 23, the connecting line 24 can be used both as an air pipe and as a pull wire, serving two purposes at once. And deflation is carried out at the discharging end 112. Due to the reduction of the surface area of the spherical airbag 25, the liquid polyurethane can also be more quickly gathered together and then drip, reducing the loss of polyurethane. The pulling back of the motor 23 can realize the next cleaning. When using the special pipe for pumping polyurethane waterproof coating, a special delivery pump is connected to the feeding end 111 to pump the polyurethane waterproof coating in and then discharge it from the discharging end 112.

[0020] Further, after the deflation is completed and a predetermined time is paused, the motor 23 rotates to roll up the connecting line 24 to pull back the deflated spherical airbag 25 into the auxiliary pipe 12, closing the first valve 113 and the deflation port 124 simultaneously.

[0021] As can be seen from the above description, after pausing for a predetermined time, the surface area of the spherical airbag 25 shrinks, facilitating the collection of the polyurethane liquid on the surface of the spherical airbag 25 together and discharging it from the discharging end 112, reducing the loss.

[0022] Further, after the deflation is completed, the air pump 21 rotates in reverse and the three-way valve 22 connects the interface 123 and the air flow channel to make the spherical airbag 25 quickly contract. After contracting for a predetermined time, the motor 23 rotates to roll up the connecting line 24 to pull back the deflated spherical airbag 25 into the auxiliary pipe 12, closing the first valve 113 and the deflation port 124 simultaneously.

[0023] As can be seen from the above description, by reversing the air pump 21 to make the spherical airbag 25 smaller, the surface area of the spherical airbag 25 quickly shrinks, facilitating the rapid collection of the polyurethane liquid on the surface of the spherical airbag 25 together and discharging it from the discharging end 112, reducing the loss.

[0024] Further, the maintenance port 121 is of a detachable structure.

[0025] As can be seen from the above description, through the maintenance port 121 of the detachable structure, the spherical airbag 25 can be replaced regularly to ensure the cleaning effect; or it can wait until the spherical airbag 25.

[0026] Furthermore, a heater is provided inside the air pump 21; Before the special pipe for transporting the polyurethane waterproof coating is conveyed, start the air pump 21 and the heater, open the first valve 113 while closing the second valve 122 and the air release port 124, and the three-way valve 22 connects the interface 123 and the inside of the auxiliary pipe 12; the blown hot air flow heats the inside of the main pipe 11 and the auxiliary pipe 12 to melt the solidified polyurethane waterproof coating inside the spherical airbag 25, the main pipe 11, and the auxiliary pipe 12, and then blows it out after partial melting.

[0027] As can be seen from the above description, through the preliminary impurity removal action, the impurity content in the subsequent conveying process can be reduced.

[0028] Furthermore, when there is residual polyurethane waterproof coating in the main pipe 11, close the second valve 122 and the air release port 124, open the first valve 113, the air pump 21, and the heater, and at the same time, the three-way valve 22 connects the air pump 21 with the air flow channel to inflate the spherical airbag 25 so that the outer periphery of the spherical airbag 25 fits against the inner wall of the auxiliary pipe 12.

[0029] As can be seen from the above description, by inflating the spherical airbag 25 with heated gas, the elasticity of the spherical airbag 25 is better, and it fits more closely against the inner walls of the main pipe 11 and the auxiliary pipe 12, thereby improving the squeezing effect.

[0030] Furthermore, the conveying motor 23 includes a rotating shaft and a wire reel 26. The conveying wire reel 26 is arranged on the rotating shaft, and the conveying connecting wire 24 is wound around the wire reel 26.

[0031] As can be seen from the above description, through the setting of the wire reel 26, the collection of the connecting wire 24 can be facilitated.

[0032] Furthermore, an arc-shaped block 13 is provided on the side wall of the main pipe 11 opposite to the auxiliary pipe 12, and the arc-shaped block 13 fits against the inflated spherical airbag 25.

[0033] As can be seen from the above description, through the arc-shaped block 13, dead corners can be eliminated, ensuring that the spherical airbag 25 can squeeze out as much polyurethane waterproof coating as possible.

[0034] Furthermore, the cleaning assembly 2 further includes a filter, and the air pump 21 further includes an air inlet, and the filter is connected to the air inlet.

[0035] As can be seen from the above description, through the setting of the filter, impurities can be filtered to prevent impurities from entering the main pipe 11 or the auxiliary pipe 12.

[0036] Further, the air pump 21 is fixed on the outer side wall of the main pipe 11.

[0037] As can be seen from the above description, by fixing the air pump 21 on the outer side wall of the main pipe 11, the air pump 21 will generate a certain jitter during operation, and this jitter plays a role in vibration, facilitating the aggregation of the polyurethane waterproof coating, and then facilitating the extrusion together. Embodiment 1 A special pipe for extracting polyurethane waterproof coating, comprising a conveying pipe 1 and a cleaning component 2; The conveying pipe 1 includes a main pipe 11 and a sub-pipe 12 with the same diameter. The main pipe 11 includes a feeding end 111 and a discharging end 112. One end of the sub-pipe 12 is communicated with the side wall of the main pipe 11 at the feeding end 111 through a first valve 113, and the other end is a maintenance port 121; a second valve 122 is arranged on the feeding end 111, and the inner walls of the main pipe 11 and the sub-pipe 12 are polished. The cleaning component 2 includes an air pump 21, a three-way valve 22, a motor 23, a connecting line 24 and a spherical airbag 25; an interface 123 and a deflation port 124 are arranged on the maintenance port 121. The air pump 21 includes an air outlet connected to the interface 123, and the interface 123 and the inside of the sub-pipe 12 are communicated through the three-way valve 22; an air flow channel is arranged in the connecting line 24, one end of the air flow channel is communicated with the three-way valve 22, and the other end is communicated with the spherical airbag 25; the motor 23 and the spherical airbag 25 are arranged in the sub-pipe 12 in a staggered manner, and the spherical airbag 25 is arranged on the side close to the first valve 113. When there is residual polyurethane waterproof coating in the main pipe 11, close the second valve 122 and the deflation port 124, open the first valve 113 and the air pump 21. At the same time, the three-way valve 22 makes the air pump 21 communicate with the air flow channel to inflate the spherical airbag 25 so that the outer periphery of the spherical airbag 25 fits against the inner wall of the sub-pipe 12; after the inflation is completed, the three-way valve 22 communicates with the inside of the sub-pipe 12, and the air pressure generated by the air pump 21 squeezes the spherical airbag 25 into the main pipe 11. The air pump 21 continues to work under pressure to push the spherical airbag 25 from the feeding end 111 to the discharging end 112, thereby realizing extrusion; after the extrusion is completed, the air pump 21 stops working, the deflation port 124 is opened for deflation, and the three-way valve 22 controls the air flow channel to communicate with the inside of the sub-pipe 12 for synchronous deflation. After the deflation is completed, the motor 23 rotates to roll up the connecting line 24 to pull the deflated spherical airbag 25 back into the sub-pipe 12, close the first valve 113 and at the same time close the deflation port 124.

[0038] After the deflation is completed and after pausing for a predetermined time, the motor 23 rotates to roll up the connecting line 24 to pull the deflated spherical airbag 25 back into the sub-pipe 12, close the first valve 113 and at the same time close the deflation port 124.

[0039] The maintenance port 121 is a detachable structure.

[0040] The conveying motor 23 includes a rotating shaft and a wire reel 26. The conveying wire reel 26 is arranged on the rotating shaft, and the conveying connecting wire 24 is wound around the wire reel 26.

[0041] An arc-shaped stopper 13 is arranged on the side wall of the main pipe 11 opposite to the auxiliary pipe 12, and the arc-shaped stopper 13 is attached to the inflated spherical airbag 25.

[0042] The cleaning assembly 2 further includes a filter, and the air pump 21 further includes an air inlet, and the filter is connected to the air inlet.

[0043] The air pump 21 is fixed on the outer side wall of the main pipe 11. Embodiment 2 A special pipe for extracting polyurethane waterproof coating, the same parts as those in Embodiment 1 will not be described in detail. The differences are as follows: After the air leakage is completed, the air pump 21 rotates in reverse and the three-way valve 22 connects the interface 123 and the air flow channel to quickly contract the spherical airbag 25. After contracting for a predetermined time, the motor 23 rotates to roll up the connecting wire 24 to pull the deflated spherical airbag 25 back into the auxiliary pipe 12, closing the first valve 113 and the air leakage port 124 at the same time. Embodiment 3 A special pipe for extracting polyurethane waterproof coating, the same parts as those in Embodiment 1 will not be described in detail. The differences are as follows: A heater is arranged inside the air pump 21; Before the special pipe for extracting polyurethane waterproof coating is conveyed, the air pump 21 and the heater are started, the first valve 113 is opened, the second valve 122 and the air leakage port 124 are closed at the same time, and the three-way valve 22 connects the interface 123 and the inside of the auxiliary pipe 12; the blown hot air flow heats the inside of the main pipe 11 and the auxiliary pipe 12 to melt the spherical airbag 25, and the solidified polyurethane waterproof coating inside the main pipe 11 and the auxiliary pipe 12 is partially melted and then blown out.

[0044] When there is residual polyurethane waterproof coating in the main pipe 11, the second valve 122 and the air leakage port 124 are closed, the first valve 113, the air pump 21 and the heater are opened, and at the same time the three-way valve 22 connects the air pump 21 with the air flow channel to inflate the spherical airbag 25 so that the outer periphery of the spherical airbag 25 fits with the inner wall of the auxiliary pipe 12. The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent transformations made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the related technical fields, are equally included in the patent protection scope of the present invention.

Claims

1. A special tube for extracting polyurethane waterproof coating, characterized in that: Includes delivery tube and clean-out assembly; The delivery pipe comprises a main pipe and a secondary pipe of the same diameter, the main pipe comprises a feed end and a discharge end, one end of the secondary pipe is connected to the side wall of the main pipe at the feed end through a first valve, and the other end is a maintenance port; a second valve is provided on the feed end, and the inner walls of the main pipe and the secondary pipe are polished; The cleaning assembly includes an air pump, a three-way valve, a motor, a connecting line and a spherical airbag; the maintenance port is provided with an interface and an air release port, the air pump includes an air outlet connected to the interface, the interface and the inside of the auxiliary pipe are connected through the three-way valve; an air flow channel is provided in the connecting line, one end of the air flow channel is connected to the three-way valve, and the other end is connected to the spherical airbag; the motor and the spherical airbag are staggered in the auxiliary pipe, and the spherical airbag is provided on the side close to the first valve; When polyurethane waterproof coating remains in the main pipe, the second valve and the air vent are closed, the first valve and the air pump are opened, and at the same time, the three-way valve connects the air pump with the air flow channel to inflate the spherical airbag so that the outer periphery of the spherical airbag fits with the inner wall of the auxiliary pipe; when the inflation is completed, the three-way valve is connected to the inside of the auxiliary pipe, and the air pressure generated by the air pump squeezes the spherical airbag into the main pipe. The air pump continues to work and pressurizes the spherical airbag from the feed end to the discharge end to achieve extrusion; after the extrusion is completed, the air pump stops working, the air vent is opened to deflate, and the three-way valve controls the air flow channel to be connected with the inside of the auxiliary pipe for synchronous deflation. After the deflation is completed, the motor rotates to roll up the connecting line to pull the deflated spherical airbag back into the auxiliary pipe, closes the first valve and the air vent at the same time.

2. The special tube for extracting polyurethane waterproof coating according to claim 1, characterized in that: After the deflation is completed and a preset time is paused, the motor rotates to roll up the connecting line, pulls the deflated spherical airbag back into the auxiliary pipe, closes the first valve and closes the deflation port at the same time.

3. The special tube for extracting polyurethane waterproof coating according to claim 1, characterized in that: After deflation is completed, the air pump reverses and the three-way valve connecting interface and the air flow channel make the spherical airbag shrink rapidly. After shrinking for a predetermined time, the motor rotates to roll up the connecting line and pull the deflated spherical airbag back into the auxiliary pipe to close the first valve and the deflation port at the same time.

4. The special tube for extracting polyurethane waterproof coating according to claim 1, characterized in that: The maintenance port is a detachable structure.

5. The special tube for extracting polyurethane waterproof coating according to claim 1, characterized in that: A heater is provided in the air pump; Before the polyurethane waterproof coating is extracted and transported through a special pipe, the air pump and the heater are started, the first valve is opened and the second valve and the air vent are closed at the same time, and the three-way valve connects the interface and the inside of the auxiliary pipe; the hot air flow blown in heats the inside of the main pipe and the auxiliary pipe to melt the spherical airbag, and the solidified polyurethane waterproof coating in the main pipe and the auxiliary pipe is partially melted and then blown out.

6. The special tube for extracting polyurethane waterproof coating according to claim 5, characterized in that: When polyurethane waterproof coating remains in the main pipe, close the second valve and the air vent, open the first valve, the air pump and the heater, and at the same time, connect the air pump with the air flow channel through the three-way valve to inflate the spherical airbag so that the outer periphery of the spherical airbag fits the inner wall of the auxiliary pipe.

7. The special tube for extracting polyurethane waterproof coating according to claim 1, characterized in that: The conveying motor comprises a rotating shaft and a wire drum. The conveying wire drum is arranged on the rotating shaft, and the conveying connecting wire is wound on the wire drum.

8. The special tube for extracting polyurethane waterproof coating according to claim 1, characterized in that: An arc-shaped stopper is arranged on the side wall of the main pipe opposite to the auxiliary pipe, and the arc-shaped stopper is fitted with the inflated spherical airbag.

9. The special tube for extracting polyurethane waterproof coating according to claim 1, characterized in that: The cleaning component also includes a filter, and the air pump also includes an air inlet, and the filter is connected to the air inlet.

10. The special tube for extracting polyurethane waterproof coating according to claim 1, characterized in that: The air pump is fixed on the outer side wall of the main pipe.

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