Special pipe for polyurethane waterproof coating extraction

Abstract

This invention relates to the field of polyurethane coating technology, specifically to a special pipe for extracting polyurethane waterproof coating, comprising a delivery pipe and a cleaning assembly; the delivery pipe includes a main pipe and a secondary pipe; the cleaning assembly includes an air pump, a three-way valve, a motor, a connecting wire, and a spherical airbag; the maintenance port is provided with an interface, the air pump includes an air outlet connected to the interface, and the interface and the interior of the secondary pipe are connected through the three-way valve; the connecting wire is provided with an airflow channel, one end of the airflow channel is connected to the three-way valve, and the other end is connected to the spherical airbag; the air pump of this invention pressurizes the secondary pipe and the main pipe, and through the cooperation of the air pump and the three-way valve, the gas flows into the interior of the secondary pipe, creating a pressure difference that drives the movement of the spherical airbag, thereby squeezing out residual polyurethane in the main pipe, ensuring the squeezing effect while being more efficient; through the connecting wire and the motor, the connecting wire can be used as both an air pipe and a pull wire, achieving two functions at once.

Description

Technical Field

[0001] This invention relates to the field of polyurethane coating technology, and specifically to a special tube for extracting polyurethane waterproof coating. Background Technology

[0002] Polyurethane coatings are a common type of coating, which can be divided into two-component and one-component polyurethane coatings. Two-component polyurethane coatings generally consist of two parts: an isocyanate prepolymer (also called a low-molecular-weight urethane polymer) and a hydroxyl-containing resin, usually referred to as the curing agent component and the main component. This type of coating has many varieties and a wide range of applications. Based on the different hydroxyl-containing components, it can be divided into acrylic polyurethane, alkyd polyurethane, polyester polyurethane, polyether polyurethane, epoxy polyurethane, etc. They generally possess good mechanical properties, high solids content, and good overall performance. It is a type of coating with great development potential. Major applications include wood coatings, automotive repair coatings, anti-corrosion coatings, floor paints, electronic coatings, specialty coatings, and polyurethane waterproof coatings.

[0003] In existing technologies, the residual polyurethane waterproof coating in the pipe after extraction is prone to curing. After repeated curing over a long period of time, the internal diameter of the pipe gradually decreases, causing inconvenience in use. Therefore, it is necessary to design a special pipe for extracting polyurethane waterproof coating that facilitates material discharge. 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 coating that facilitates material discharge.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A special pipe for extracting polyurethane waterproof coating includes a delivery pipe and a cleaning assembly;

[0007] The conveying pipe includes a main pipe and a secondary pipe of the same diameter. The main pipe includes an inlet end and an outlet end. One end of the secondary pipe is connected to the side wall of the main pipe at the inlet end through a first valve, and the other end is a maintenance port. A second valve is provided on the inlet end. The inner walls of the main pipe and the secondary pipe are polished.

[0008] The cleaning assembly includes an air pump, a three-way valve, a motor, a connecting wire, and a spherical airbag; the maintenance port is provided with an interface and a vent, the air pump includes an air outlet connected to the interface, and the interface and the interior of the secondary pipe are connected through the three-way valve; the connecting wire is provided with an airflow channel, one end of the airflow 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 and arranged in the secondary pipe, and the spherical airbag is arranged on the side closer to the first valve;

[0009] When polyurethane waterproof coating remains in the main pipe, close the second valve and the vent, open the first valve and the air pump, and simultaneously connect the air pump to the airflow channel via the three-way valve to inflate the spherical airbag, causing the outer circumference of the spherical airbag to adhere to the inner wall of the secondary pipe. After inflation, the air pump pressure, connected to the internal part of the secondary pipe via the three-way valve, forces the spherical airbag into the main pipe. The air pump continues to work and pressurize, pushing the spherical airbag from the feed end to the discharge end, thus achieving extrusion. After extrusion, the air pump stops working, the vent opens to release air, and the three-way valve controls the airflow channel to connect to the internal part of the secondary pipe for synchronous venting. After venting, the motor rotates to wind up the connecting wire, pulling the vented spherical airbag back into the secondary pipe, and then the first valve is closed, and the vent is also closed.

[0010] Preferably, after the deflation is completed and a predetermined time is paused, the motor rotates to wind up the connecting wire, pulls the deflated spherical airbag back into the secondary pipe, closes the first valve, and simultaneously closes the deflation port.

[0011] Preferably, after the deflation is completed, the air pump reverses and the three-way valve connects the interface and the airflow channel, causing the spherical airbag to contract rapidly. After the contraction time is predetermined, the motor rotates to wind up the connecting wire and pull the deflated spherical airbag back into the secondary pipe, closing the first valve and the deflation port.

[0012] Preferably, the maintenance port is a detachable structure.

[0013] Preferably, the air pump is equipped with a heater;

[0014] Before the polyurethane waterproof coating is extracted and transported through a special pipe, the air pump and heater are started, the first valve is opened while the second valve and the vent are closed, and the three-way valve connects the interface and the inside of the secondary pipe; the hot airflow blown in heats and melts the solidified polyurethane waterproof coating inside the spherical airbag, main pipe, and secondary pipe, and then blows it out.

[0015] Preferably, when polyurethane waterproof coating remains in the main pipe, the second valve and vent are closed, the first valve, air pump and heater are opened, and the three-way valve connects the air pump to the airflow channel to inflate the spherical airbag so that the outer periphery of the spherical airbag fits against the inner wall of the secondary pipe.

[0016] Preferably, the conveyor motor includes a shaft and a reel, with the conveyor reel mounted on the shaft and the conveyor connecting wire wound on the reel.

[0017] Preferably, an arc-shaped stop is provided on the side wall of the main tube opposite to the secondary tube, and the arc-shaped stop fits into the inflated spherical airbag.

[0018] Preferably, the cleaning assembly further includes a filter, and the air pump further includes an air inlet, with the filter connected to the air inlet.

[0019] Preferably, the air pump is fixed to the outer wall of the main pipe.

[0020] The beneficial effects of this invention are as follows: By using a spherical airbag in conjunction with the polished inner wall of the main pipe and the secondary pipe, the spherical airbag will not fail during cleaning. The second valve and one end of the secondary pipe are positioned on the side wall of the main pipe at the feed end, ensuring that the spherical airbag can only move towards the discharge end after entering the main pipe. Furthermore, by using an air pump to pressurize the secondary pipe and the main pipe, and through the cooperation of the air pump and the three-way valve, the gas flows into the secondary pipe, creating a pressure difference that drives the movement of the spherical airbag, thereby achieving the extrusion of residual polyurethane in the main pipe, ensuring both effective extrusion and high efficiency. Higher efficiency; by using a spherical airbag with main and auxiliary pipes of the same diameter, the airbag only needs to be inflated once, eliminating the need for repeated inflation or deflation to adapt to different pipe diameters, further improving work efficiency. The spherical structure allows for complete fit against the inner walls of the main and auxiliary pipes; through the connecting line and motor, the connecting line can be used as both an air hose and a pull line, achieving two functions at once, and deflating at the discharge end. Due to the reduced surface area of ​​the spherical airbag, the liquid polyurethane can more quickly gather together and drip, reducing polyurethane loss; the motor's pull-back function enables the next cleaning. When using a special pipe for extracting polyurethane waterproof coating, a dedicated delivery pump is connected to the inlet end to pump the polyurethane waterproof coating in, and then it is discharged from the outlet end. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the initial state of a special tube for extracting polyurethane waterproof coating according to a specific embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the inflated state of a spherical airbag in a special tube for extracting polyurethane waterproof coating according to a specific embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of a spherical airbag being squeezed from the secondary tube into the main tube by air pressure in a special tube for extracting polyurethane waterproof coating according to a specific embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the working process of a spherical airbag inside a special tube for extracting polyurethane waterproof coating, which is a specific embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the spherical airbag in the deflation state of a special tube for extracting polyurethane waterproof coating according to a specific embodiment of the present invention.

[0026] Figure 6 A schematic diagram of the motor pulling back after the spherical airbag of a special tube for extracting polyurethane waterproof coating has been deflated, which is a specific embodiment of the present invention.

[0027] Labeling Explanation: 1. Conveying Pipe; 11. Main Pipe; 111. Feed End; 112. Discharge End; 113. First Valve; 12. Secondary Pipe; 121. Maintenance Port; 122. Second Valve; 123. Interface; 124. Vent; 13. Arc-shaped Stop; 2. Cleaning Components; 21. Air Pump; 22. Three-way Valve; 23. Motor; 24. Connecting Cable; 25. Spherical Airbag; 26. Wire Reel. Detailed Implementation

[0028] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0029] Please refer to Figures 1 to 6 A special pipe for extracting polyurethane waterproof coating includes a delivery pipe 1 and a cleaning component 2;

[0030] The conveying pipe 1 includes a main pipe 11 and a secondary pipe 12 of the same diameter. The main pipe 11 includes an inlet end 111 and an outlet end 112. One end of the secondary pipe 12 is connected to the side wall of the main pipe 11 at the inlet end 111 through a first valve 113, and the other end is a maintenance port 121. A second valve 122 is provided on the inlet end 111. The inner walls of the main pipe 11 and the secondary pipe 12 are polished.

[0031] The cleaning assembly 2 includes an air pump 21, a three-way valve 22, a motor 23, a connecting line 24, and a spherical airbag 25. The maintenance port 121 is provided with an interface 123 and a vent 124. The air pump 21 includes an air outlet connected to the interface 123. The interface 123 and the interior of the secondary pipe 12 are connected via the three-way valve 22. An airflow channel is provided within the connecting line 24, with one end connected to the three-way valve 22 and the other end connected to the spherical airbag 25. The motor 23 and the spherical airbag 25 are staggered within the secondary pipe 12, with the spherical airbag 25 positioned near the first valve 113.

[0032] When polyurethane waterproof coating remains in the main pipe 11, close the second valve 122 and the vent 124, open the first valve 113 and the air pump 21, and simultaneously connect the air pump 21 to the airflow channel via the three-way valve 22 to inflate the spherical airbag 25 so that the outer periphery of the spherical airbag 25 fits against the inner wall of the secondary pipe 12. After inflation, the air pressure generated by the air pump 21, connected to the internal part of the secondary pipe 12 via the three-way valve 22, forces the spherical airbag 25 into the main pipe 11. The air pump 21 continues to work and pressurize, pushing the spherical airbag 25 from the feed end 111 to the discharge end 112 to achieve extrusion. After extrusion, the air pump 21 stops working, the vent 124 opens to vent, and the three-way valve 22 controls the airflow channel to connect to the internal part of the secondary pipe 12 for synchronous venting. After venting, the motor 23 rotates to wind up the connecting wire 24 and pull the vented spherical airbag 25 back into the secondary pipe 12, closing the first valve 113 and the vent 124.

[0033] As described above, by using a spherical airbag 25 in conjunction with the polished inner wall of the secondary pipe 12 inside the main pipe 11, the spherical airbag 25 will not fail during cleaning. The second valve 122 and one end of the secondary pipe 12 are positioned on the side wall of the main pipe 11 at the feed end 111, ensuring that the spherical airbag 25, after entering the main pipe 11, can only move towards the discharge end 112. Then, with the air pump 21 pressurizing the secondary pipe 12 and the main pipe 11, and through the cooperation of the air pump 21 and the three-way valve 22, the gas flows into the secondary pipe 12, creating a pressure difference that drives the movement of the spherical airbag 25, thereby extruding residual polyurethane from the main pipe 11 and ensuring effective extrusion. This method achieves higher efficiency while producing better results. By using a spherical airbag 25 connected to a main pipe 11 and a secondary pipe 12 of the same diameter, the airbag 25 only needs to be inflated once, eliminating the need for repeated inflation or deflation to adapt to different pipe diameters, further improving work efficiency. The spherical structure allows for complete contact with the inner walls of the main pipe 11 and the secondary pipe 12. The connecting line 24, connected to a motor 23, serves as both an air hose and a pull line, achieving two functions at once. Deflating at the discharge end 112, due to the reduced surface area of ​​the spherical airbag 25, allows the liquid polyurethane to collect more quickly and drip down, reducing polyurethane loss. The retraction of the motor 23 enables the next cleaning cycle. When using a dedicated pipe for extracting polyurethane waterproof coating, a special delivery pump connected to the inlet end 111 pumps the polyurethane waterproof coating in, and then discharges it from the outlet end 112.

[0034] Furthermore, after the deflation is completed and the predetermined time is paused, the motor 23 rotates to wind up the connecting wire 24 and pull the deflated spherical airbag 25 back into the secondary pipe 12, closing the first valve 113 and simultaneously closing the vent 124.

[0035] As can be seen from the above description, after pausing for a predetermined time, the surface area of ​​the spherical airbag 25 is reduced, which makes it easier for the polyurethane liquid on the surface of the spherical airbag 25 to collect together and be discharged from the discharge end 112, thus reducing losses.

[0036] Furthermore, after the deflation is completed, the air pump 21 reverses and the three-way valve 22 connects the interface 123 and the airflow channel, causing the spherical airbag 25 to contract rapidly. After the contraction time is predetermined, the motor 23 rotates to wind up the connecting wire 24 and pull the deflated spherical airbag 25 back into the secondary pipe 12, closing the first valve 113 and simultaneously closing the vent 124.

[0037] 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 is rapidly reduced, which makes it easier for the polyurethane liquid on the surface of the spherical airbag 25 to quickly gather together and be discharged from the discharge end 112, thus reducing losses.

[0038] Furthermore, the maintenance port 121 is a detachable structure.

[0039] As can be seen from the above description, the spherical airbag 25 can be replaced periodically through the maintenance port 121 of the detachable structure to ensure the cleaning effect; or the spherical airbag 25 can be replaced later.

[0040] Furthermore, a heater is provided inside the air pump 21;

[0041] Before the polyurethane waterproof coating is extracted and transported through a special pipe, the air pump 21 and heater are started, the first valve 113 is opened and the second valve 122 and the vent 124 are closed at the same time, and the three-way valve 22 connects the interface 123 and the interior of the secondary pipe 12; the hot air blown in heats and melts the solidified polyurethane waterproof coating inside the main pipe 11 and the secondary pipe 12, and then blows it out.

[0042] As can be seen from the above description, the impurity content in the subsequent conveying process can be reduced through the initial impurity removal action.

[0043] Furthermore, when polyurethane waterproof coating remains in the main pipe 11, the second valve 122 and the vent 124 are closed, and the first valve 113, the air pump 21 and the heater are opened. At the same time, the three-way valve 22 connects the air pump 21 to the airflow channel to inflate the spherical airbag 25 so that the outer periphery of the spherical airbag 25 fits against the inner wall of the secondary pipe 12.

[0044] As can be seen from the above description, the spherical airbag 25 is inflated by the heated gas, which makes the spherical airbag 25 more elastic and fits better against the inner wall of the main pipe 11 and the secondary pipe 12, thereby improving the extrusion effect.

[0045] Furthermore, the conveyor motor 23 includes a rotating shaft and a wire reel 26, with the wire reel 26 mounted on the rotating shaft and the conveying connecting wire 24 wound around the wire reel 26.

[0046] As can be seen from the above description, the cable reel 26 facilitates the collection of the connecting cable 24.

[0047] Furthermore, an arc-shaped stop 13 is provided on the side wall of the main pipe 11 opposite to the secondary pipe 12, and the arc-shaped stop 13 fits into the inflated spherical airbag 25.

[0048] As can be seen from the above description, the arc-shaped baffle 13 can eliminate dead angles and ensure that the spherical airbag 25 can squeeze out as much polyurethane waterproof coating as possible.

[0049] Furthermore, the cleaning component 2 also includes a filter, and the air pump 21 also includes an air inlet, with the filter connected to the air inlet.

[0050] As can be seen from the above description, by setting up the filter, impurities can be filtered out, preventing them from entering the main pipe 11 or the secondary pipe 12.

[0051] Furthermore, the air pump 21 is fixed to the outer wall of the main pipe 11.

[0052] As can be seen from the above description, the air pump 21 is fixed on the outer wall of the main pipe 11. When the air pump 21 is working, it will generate a certain vibration. This vibration will have a vibration effect, which will facilitate the accumulation of polyurethane waterproof coating and make it easier to squeeze it out at the same time.

[0053] Example 1

[0054] A special pipe for extracting polyurethane waterproof coating includes a delivery pipe 1 and a cleaning component 2;

[0055] The conveying pipe 1 includes a main pipe 11 and a secondary pipe 12 of the same diameter. The main pipe 11 includes an inlet end 111 and an outlet end 112. One end of the secondary pipe 12 is connected to the side wall of the main pipe 11 at the inlet end 111 through a first valve 113, and the other end is a maintenance port 121. A second valve 122 is provided on the inlet end 111. The inner walls of the main pipe 11 and the secondary pipe 12 are polished.

[0056] The cleaning assembly 2 includes an air pump 21, a three-way valve 22, a motor 23, a connecting line 24, and a spherical airbag 25. The maintenance port 121 is provided with an interface 123 and a vent 124. The air pump 21 includes an air outlet connected to the interface 123. The interface 123 and the interior of the secondary pipe 12 are connected via the three-way valve 22. An airflow channel is provided within the connecting line 24, with one end connected to the three-way valve 22 and the other end connected to the spherical airbag 25. The motor 23 and the spherical airbag 25 are staggered within the secondary pipe 12, with the spherical airbag 25 positioned near the first valve 113.

[0057] When polyurethane waterproof coating remains in the main pipe 11, close the second valve 122 and the vent 124, open the first valve 113 and the air pump 21, and simultaneously connect the air pump 21 to the airflow channel via the three-way valve 22 to inflate the spherical airbag 25 so that the outer periphery of the spherical airbag 25 fits against the inner wall of the secondary pipe 12. After inflation, the air pressure generated by the air pump 21, connected to the internal part of the secondary pipe 12 via the three-way valve 22, forces the spherical airbag 25 into the main pipe 11. The air pump 21 continues to work and pressurize, pushing the spherical airbag 25 from the feed end 111 to the discharge end 112 to achieve extrusion. After extrusion, the air pump 21 stops working, the vent 124 opens to vent, and the three-way valve 22 controls the airflow channel to connect to the internal part of the secondary pipe 12 for synchronous venting. After venting, the motor 23 rotates to wind up the connecting wire 24 and pull the vented spherical airbag 25 back into the secondary pipe 12, closing the first valve 113 and the vent 124.

[0058] After the deflation is completed and the predetermined time is paused, the motor 23 rotates to wind up the connecting wire 24 and pull the deflated spherical airbag 25 back into the secondary pipe 12, closing the first valve 113 and simultaneously closing the vent 124.

[0059] The maintenance port 121 is a detachable structure.

[0060] The conveyor motor 23 includes a rotating shaft and a wire reel 26. The conveyor wire reel 26 is mounted on the rotating shaft, and the conveyor connecting wire 24 is wound around the wire reel 26.

[0061] An arc-shaped stop 13 is provided on the side wall of the main pipe 11 opposite to the secondary pipe 12, and the arc-shaped stop 13 fits into the inflated spherical airbag 25.

[0062] The cleaning assembly 2 also includes a filter, and the air pump 21 also includes an air inlet, with the filter connected to the air inlet.

[0063] The air pump 21 is fixed on the outer wall of the main pipe 11.

[0064] Example 2

[0065] A special tube for extracting polyurethane waterproof coating is similar to that in Example 1, and will not be repeated here. The difference is that:

[0066] After the deflation is completed, the air pump 21 reverses and the three-way valve 22 connects the interface 123 and the airflow channel, causing the spherical airbag 25 to contract rapidly. After the contraction time is predetermined, the motor 23 rotates and winds up the connecting wire 24 to pull the deflated spherical airbag 25 back into the secondary pipe 12, closing the first valve 113 and the deflation port 124.

[0067] Example 3

[0068] A special tube for extracting polyurethane waterproof coating is similar to that in Example 1, and will not be repeated here. The difference is that:

[0069] A heater is installed inside the air pump 21;

[0070] Before the polyurethane waterproof coating is extracted and transported through a special pipe, the air pump 21 and heater are started, the first valve 113 is opened and the second valve 122 and the vent 124 are closed at the same time, and the three-way valve 22 connects the interface 123 and the interior of the secondary pipe 12; the hot air blown in heats and melts the solidified polyurethane waterproof coating inside the main pipe 11 and the secondary pipe 12, and then blows it out.

[0071] When polyurethane waterproof coating remains in the main pipe 11, close the second valve 122 and the vent 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 to the airflow channel to inflate the spherical airbag 25 so that the outer periphery of the spherical airbag 25 fits against the inner wall of the secondary pipe 12.

[0072] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A special tube for extracting polyurethane waterproof coating, characterized in that, Includes delivery pipes and cleaning components; The conveying pipe includes a main pipe and a secondary pipe of the same diameter. The main pipe includes an inlet end and an outlet end. One end of the secondary pipe is connected to the side wall of the main pipe at the inlet end through a first valve, and the other end is a maintenance port. A second valve is provided on the inlet end. 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 wire, and a spherical airbag; the maintenance port is provided with an interface and a vent, the air pump includes an air outlet connected to the interface, and the interface and the interior of the secondary pipe are connected through the three-way valve; the connecting wire is provided with an airflow channel, one end of the airflow 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 and arranged in the secondary pipe, and the spherical airbag is arranged on the side closer to the first valve; When polyurethane waterproof coating remains in the main pipe, close the second valve and the vent, open the first valve and the air pump, and simultaneously connect the air pump to the airflow channel via the three-way valve to inflate the spherical airbag, causing the outer circumference of the spherical airbag to adhere to the inner wall of the secondary pipe. After inflation, the air pump pressure, connected to the internal part of the secondary pipe via the three-way valve, forces the spherical airbag into the main pipe. The air pump continues to work and pressurize, pushing the spherical airbag from the feed end to the discharge end, thus achieving extrusion. After extrusion, the air pump stops working, the vent opens to release air, and the three-way valve controls the airflow channel to connect to the internal part of the secondary pipe for synchronous venting. After venting, the motor rotates to wind up the connecting wire, pulling the vented spherical airbag back into the secondary pipe, and then the first valve is closed, and the vent is also closed.

2. The special tube for extracting polyurethane waterproof coating according to claim 1, characterized in that, After the deflation is complete and the predetermined time is paused, the motor rotates to wind up the connecting wire and pull the deflated spherical airbag back into the secondary pipe, closing the first valve and the deflation port simultaneously.

3. The special tube for extracting polyurethane waterproof coating according to claim 1, characterized in that, After deflating, the air pump reverses direction, and the three-way valve connects the interface and the airflow channel, causing the spherical airbag to contract rapidly. After a predetermined contraction time, the motor rotates to wind up the connecting wire, pulling the deflated spherical airbag back into the secondary pipe, closing the first valve, and simultaneously closing the deflating port.

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, The air pump is equipped with a heater. Before the polyurethane waterproof coating is extracted and transported through a special pipe, the air pump and heater are started, the first valve is opened while the second valve and the vent are closed, and the three-way valve connects the interface and the inside of the secondary pipe; the hot airflow blown in heats and melts the solidified polyurethane waterproof coating inside the spherical airbag, main pipe, and secondary pipe, and then blows it 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 vent, open the first valve, the air pump and the heater, and at the same time, connect the air pump to the airflow channel through the three-way valve to inflate the spherical airbag so that the outer periphery of the spherical airbag fits against the inner wall of the secondary pipe.

7. The special tube for extracting polyurethane waterproof coating according to claim 1, characterized in that, The conveyor motor includes a shaft and a reel. The conveyor reel is mounted on the shaft, and the conveyor connecting line is wound on the reel.

8. The special tube for extracting polyurethane waterproof coating according to claim 1, characterized in that, An arc-shaped stop is provided on the side wall of the main tube opposite to the secondary tube, and the arc-shaped stop fits into the inflated spherical airbag.

9. The special tube for extracting polyurethane waterproof coating according to claim 1, characterized in that, The cleaning assembly also includes a filter, and the air pump also includes an air inlet, with the filter 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 to the outer wall of the main pipe.

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