A spraying and foaming device and process for rigid polyurethane insulation

Abstract

The application relates to a spraying and foaming device and process for a rigid polyurethane thermal insulation layer, and belongs to the polyurethane spraying and foaming technical field. The device comprises a weighing assembly, a stirring assembly, a spraying assembly and a turnover assembly. In the stirring assembly, a stirrer is rotationally arranged at the upper part of the inside of a stirring barrel, a stirring homogenizer is reciprocally slidably arranged at the lower part of the inside of the stirring barrel along the axial direction of the stirring barrel, the outer edge of the stirring homogenizer is attached to the inner wall of the stirring barrel, the stirrer can penetrate into the inside of the stirring homogenizer after the stirring homogenizer moves, and the composite mixing mode combining rotation stirring and up-down reciprocating pushing is adopted to eliminate the material concentration gradient; the spraying assembly reciprocally moves along the axial direction of a pipe fitting, and the turnover assembly drives the pipe fitting to rotate around the axial line of the pipe fitting. The application can effectively improve the mixing uniformity of high-viscosity foaming raw materials, reduce the barrel wall material residues and bottom settlement, and guarantee the compactness and thickness uniformity of the thermal insulation layer forming quality.

Description

Technical Field

[0001] This application relates to the technical field of polyurethane spraying and foaming, and in particular to a spraying and foaming equipment and process for rigid polyurethane insulation layers. Background Technology

[0002] In the insulation projects of underground direct-buried pipelines, rigid polyurethane spray foaming technology is widely used for the on-site fabrication of the external insulation layer of pipelines due to its excellent thermal insulation performance and seamless molding characteristics. This technology typically involves feeding two components, isocyanate (component A) and polyether (component B), into a spray gun, mixing and atomizing them before spraying them onto the outer wall of a rotating pipe, and then using a chemical reaction to foam and cure to form the insulation layer.

[0003] Existing spray foaming systems typically involve agitation equipment, which needs to stir and mix liquid raw materials. However, the two components of polyurethane raw materials have a significant viscosity difference in the initial stage of mixing, and as the foaming reaction proceeds, the material state gradually changes from a low-viscosity liquid to a high-viscosity foam fluid, with its rheological properties changing drastically in a short period of time. Existing single rotary agitators can only generate effective eddy current disturbance in a local area of ​​the mixing tank, while the material inside the mixing tank, especially near the tank wall and bottom, cannot obtain sufficient shear and exchange. This results in the concentration gradient between the upper and lower layers of material, and between the center and the edge of the material, which cannot be effectively eliminated, leading to insufficient mixing uniformity.

[0004] Therefore, there is an urgent need for a new spray foaming equipment. Summary of the Invention

[0005] To address the problem of uneven mixing of liquid raw materials caused by the single mixing method in existing spray foaming equipment, this application provides a spray foaming equipment and process for rigid polyurethane insulation layers.

[0006] In a first aspect, this application provides a spraying and foaming equipment for rigid polyurethane insulation layers, employing the following technical solution: A spraying and foaming equipment for rigid polyurethane insulation layers includes: The weighing assembly includes a weighing base, a weight sensor, and a weighing bucket. The weight sensor is disposed inside the weighing base, and the weighing bucket is disposed on the weighing base. The weighing bucket is used to weigh two different raw materials. A mixing assembly includes a transfer tank, a mixing tank, a mixing driver, a stirrer, a mixing driver, a mixing device, and a heating module. The mixing tank is located above the transfer tank and is connected to the transfer tank via pipes and valves at its bottom. The stirring driver and the mixing driver are both located at the top outer side of the mixing tank. The stirrer is rotatably mounted inside the upper part of the mixing tank, and the mixing device is slidably mounted inside the lower part of the mixing tank along its axial direction. The stirring driver is used to drive the stirrer to rotate, and the mixing driver is used for... The stirring device drives the stirrer to move back and forth. The heating module is respectively set outside the transfer tank and the mixing tank. The stirrer includes an inner stirring sleeve, a stirring plate, and an outer stirring sleeve. The outer stirring sleeve is fitted outside the inner stirring sleeve. One end of the stirring plate is connected to the inner stirring sleeve, and the other end is connected to the outer stirring sleeve. There are multiple stirring plates, which are evenly distributed in a circumferential manner. Adjacent stirring plates are spaced apart. The outer edge of the outer stirring sleeve is attached to the inner wall of the mixing tank. After moving, the stirrer can penetrate into the interior of the inner stirring sleeve. A spraying assembly includes a spray gun that moves reciprocally in a straight line, the spray gun being used to spray a foaming agent onto a pipe to be sprayed to form an insulation layer; A flipping assembly is disposed to the side of the spraying assembly. The pipe to be sprayed is placed on the flipping assembly, and the flipping assembly is used to make the pipe rotate around its own axis.

[0007] By adopting the above technical solution, the weighing component can independently weigh two different raw materials, ensuring the accuracy of the proportioning from the source. In the mixing component, the agitator and the stirrer are set in upper and lower sections inside the mixing tank. The stirrer can move back and forth along the axis of the tank, and the outer edge of its stirring jacket is attached to the tank wall. After moving, the agitator can penetrate into the inner stirring sleeve, realizing a composite mixing method that combines rotary stirring and upper and lower pushing and squeezing. Compared with single rotary stirring, this structure can effectively eliminate the concentration gradient between the upper and lower layers of materials in the mixing tank and between the center and the tank wall, greatly improving the mixing uniformity of high-viscosity foaming materials. At the same time, the stirring jacket can actively scrape off the residual material adhering to the tank wall during the movement, reducing material retention and solidification accumulation, and reducing the frequency of cleaning and maintenance. Combined with the linear reciprocating spraying of the spraying component and the full circumference rotation of the flipping component, the uniformly mixed foaming agent can be evenly coated on the outer wall of the pipe, thereby ensuring the density and thickness uniformity of the outer insulation layer of the underground direct-buried pipe.

[0008] Optionally, the plurality of mixing plates are divided into two layers, and there are two mixing jackets. The two mixing jackets are coaxial and spaced apart. The mixing plate in the upper layer corresponds to the mixing jacket above it, and the mixing plate in the lower layer corresponds to the mixing jacket below it.

[0009] By adopting the above technical solution, the two mixing plates correspond to two coaxially spaced mixing jackets. When the mixer moves back and forth, it can simultaneously generate shearing and pushing effects on the material in different depth areas, expand the turbulence range in a single stroke, further enhance the vertical exchange flow of the material in the mixing tank, and improve the overall mixing efficiency and uniformity.

[0010] Optionally, all the mixing plates are inclined at the same angle.

[0011] By adopting the above technical solution, the mixing plate is set at an angle, which enables the agitator to generate a two-way flow effect on the liquid foaming agent in both the radial and axial directions when it moves up and down. This creates a more complex three-dimensional turbulence field inside the mixing tank, effectively eliminating the mixing dead zone and further improving the uniformity of the cell structure.

[0012] Optionally, the inner sleeve of the mixing device is provided with an ear plate, which is located above the mixing plate and is connected to the driving end of the mixing driver.

[0013] By adopting the above technical solution, the ear plate provides a simple and reliable connection structure between the agitator and the agitator driver, ensuring stable transmission of reciprocating power and improving the structural stability and operational reliability of the equipment.

[0014] Optionally, the bottom of the mixing sleeve is provided with a conical pushing protrusion, which is used to push the flowing foaming agent.

[0015] By adopting the above technical solution, the conical pusher protrusion can push the material at the bottom of the bucket to the surroundings when the mixer moves downward, effectively reducing the movement resistance and avoiding jamming. At the same time, it actively pushes the components deposited at the bottom of the bucket to the working area of ​​the mixing plate, eliminating the bottom settling blind zone and ensuring the overall homogeneity of the material in the bucket.

[0016] Optionally, the stirrer includes a stirring shaft and stirring blades, the stirring shaft being connected to the output end of the stirring driver, and the stirring blades being connected to the stirring shaft in a cage shape.

[0017] By adopting the above technical solution, the cage-shaped stirring blades form a large-scale circulating flow field in the upper part of the mixing tank, which has both a large turbulence area and low shear resistance, and can reduce the damage to the bubble-forming holes while ensuring the mixing effect. After the agitator moves up, the agitator penetrates into the inner sleeve of the mixing tank to form a spatial nesting fit, realizing complementary flow direction and strengthening the material exchange in each area of ​​the tank.

[0018] Optionally, the spraying assembly further includes a spraying truss, a spraying traveling plate, a spraying traveling drive, and a spraying robotic arm. The spraying truss is set on the ground and its length direction is consistent with the axial direction of the pipe to be sprayed. The spraying traveling plate is slidably mounted on the spraying truss. The spraying traveling drive is mounted on the spraying traveling plate and is used to provide power for the spraying traveling plate to move. The spraying robotic arm is mounted on the spraying traveling plate, and the spray gun is mounted on the execution end of the spraying robotic arm. The spray gun is connected to the transfer tank via a pipeline.

[0019] By adopting the above technical solution, the spraying walking plate moves back and forth along the spraying truss, driving the spraying robotic arm and spray gun to perform continuous automated spraying along the pipe axis; the spraying robotic arm can flexibly adjust the spraying angle to adapt to different pipe diameters, ensure the best spraying distance and verticality, avoid missed spraying, double spraying and dripping, and effectively ensure the consistency of the insulation layer thickness in the axial and circumferential directions.

[0020] Optionally, the flipping assembly includes a flipping bracket, a flipping wheel, and a flipping drive. There are multiple flipping brackets arranged side by side. The flipping wheel is rotatably mounted on the top of the flipping bracket, and the outer edge of the flipping wheel contacts the pipe to be coated. The flipping drive is located on the side of one end of the flipping bracket, and the output end of the flipping drive is inserted into the interior of the pipe to be coated and used to drive the pipe to be coated to rotate.

[0021] By adopting the above technical solution, multiple flipping brackets and flipping wheels provide stable rolling support for the pipe fittings. The flipping drive drives the pipe fittings to rotate at a uniform speed to achieve uniform material receiving in the entire circumference. Combined with the axial movement of the spray gun, a spiral continuous spraying process is formed, ensuring the uniformity of the thickness and density of the insulation layer on the entire outer circumference of the pipe fittings.

[0022] Optionally, the flipping bracket is scissor-shaped and its top can move vertically.

[0023] By adopting the above technical solution, the top of the scissor-shaped flipping bracket can be adjusted vertically to meet the support height requirements of different pipe diameters, ensuring that the pipe axis is parallel to the movement trajectory of the spray gun and that the flipping wheel is in reliable contact with the outer wall of the pipe, thus significantly improving the equipment's adaptability to direct-buried pipes of different specifications.

[0024] Secondly, this application provides a spraying and foaming process for a rigid polyurethane insulation layer, applied to the spraying and foaming equipment for a rigid polyurethane insulation layer as described in any one of the above-mentioned methods, and adopts the following technical solution: A spraying and foaming process for a rigid polyurethane insulation layer includes the following steps: S1. Raw material preparation and weighing: Isocyanate raw material and polyether composite raw material are put into the weighing bucket of the weighing component, and the two raw materials are weighed independently by the weight sensor. The required mass of each raw material is obtained according to the preset ratio. S2. Preheating and feeding: Start the heating module to preheat the mixing tank and the transfer tank, put the two sets of weighed raw materials into the mixing tank, and control the temperature inside the mixing tank to the preset foaming temperature range. S3. Stirring and Mixing: Start the stirring driver to drive the stirrer to rotate in the upper area of ​​the mixing tank to rotate and stir the liquid raw materials; at the same time, start the mixing driver to drive the mixer to move back and forth along the axis of the mixing tank. During the movement of the mixer, the mixing plate pushes the liquid foaming agent to flow in the mixing tank. The outer edge of the mixing jacket moves against the inner wall of the mixing tank to scrape off the material attached to the wall. The stirrer moves upward and enters the inner mixing jacket, forming a spatial nesting fit with the stirrer, to perform compound mixing of materials in different areas of the mixing tank until the two sets of raw materials are fully mixed to form liquid foaming agent. S4. Transfer and storage: Open the valve on the bottom of the mixing tank to discharge the well-mixed liquid foaming agent into the transfer tank. The temperature of the liquid foaming agent in the transfer tank is kept constant by the heating module. S5. Fitting clamping and flipping: Place the fitting to be sprayed on the flipping bracket of the flipping assembly, so that the outer edge of the flipping wheel contacts the outer wall of the fitting. Adjust the top height of the scissor-shaped flipping bracket so that the axis of the fitting is parallel to the spraying trajectory of the spraying assembly. Start the flipping drive, and the output end of the flipping drive enters the interior of the fitting and drives the fitting to rotate at a constant speed around its own axis. S6. Spraying and foaming molding: The spraying walking drive is activated to drive the spraying walking plate to move at a constant speed along the length of the spraying truss. At the same time, the spraying angle of the spray gun is adjusted by the spraying robotic arm to keep the spray gun at a preset spraying distance and perpendicularity to the surface of the pipe. The spray gun continuously sprays the liquid foaming agent in the transfer tank onto the outer wall of the uniformly rotating pipe through the pipeline. The liquid foaming agent foams and solidifies on the surface of the pipe to form a rigid polyurethane insulation layer.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. This application utilizes a composite mixing structure that combines the rotary stirring of the agitator with the reciprocating pushing and extruding of the stirrer. This, along with the outer sleeve of the stirrer adhering to the barrel wall to scrape off the attached material and the agitator penetrating into the inner sleeve of the stirrer to form a nested fit, can effectively eliminate the concentration gradient under conditions of drastic changes in material viscosity. This ensures that the two raw materials are fully mixed, guaranteeing sufficient foaming reaction and uniform cell structure, thereby improving the thermal insulation performance and structural strength of the insulation layer.

[0026] 2. This application uses the reciprocating movement of the mixing jacket against the barrel wall to scrape away adhering residues, combined with the conical pusher protrusion at the bottom of the mixing inner jacket to eliminate bottom settling blind spots and reduce movement resistance, and the heating module to maintain the fluidity of raw materials, effectively avoiding material retention, solidification and jamming, reducing the frequency of downtime for cleaning, and ensuring long-term continuous and stable operation of the equipment.

[0027] 3. This application ensures the accuracy of the mixing ratio by independently weighing with a weighing component, drives the pipe to rotate at a constant speed with a flipping component, and moves at a constant speed along the axial direction of the pipe and flexibly adjusts the spraying angle to form a spiral continuous and uniform spraying path. This allows the components to work closely together and ultimately form a uniform, dense and defect-free insulation layer along the entire length and circumference of the pipe, meeting the dual requirements of consistent quality and high construction efficiency in underground direct-buried pipe projects. Attached Figure Description

[0028] Figure 1 This is a top view of a spraying and foaming equipment for a rigid polyurethane insulation layer provided in this application; Figure 2 This is a front view of a spraying and foaming equipment for a rigid polyurethane insulation layer provided in this application; Figure 3 This is a schematic diagram of the structure of the weighing component provided in this application; Figure 4 This is a schematic diagram of the structure of the stirring assembly provided in this application; Figure 5 This is a schematic diagram of the mixing tank and its internal structure provided in this application; Figure 6 yes Figure 5 The right view; Figure 7 This is a partial structural schematic diagram of the spraying assembly provided in this application; Figure 8 This is a partial structural diagram of the flipping component provided in this application.

[0029] Explanation of reference numerals in the attached figures: 1. Weighing assembly; 2. Mixing assembly; 3. Spraying assembly; 4. Tilting assembly; 101. Weighing stand; 102. Weighing bucket; 201. Transfer tank; 202. Mixing tank; 203. Mixing driver; 204. Agitator; 205. Stirring driver; 206. Inner stirring sleeve; 207. Stirring plate; 208. Outer stirring sleeve; 209. Pushing protrusion; 301. Spray gun; 302. Spray truss; 303. Spray traveling plate; 304. Spray robotic arm; 401. Flip bracket; 402. Flip wheel; 403. Flip drive. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1-8 This application will be described in further detail.

[0031] This application discloses a spraying and foaming equipment for rigid polyurethane insulation layers.

[0032] refer to Figure 1 and Figure 2 A rigid polyurethane insulation layer spraying and foaming equipment includes a weighing component 1, a mixing component 2, a spraying component 3, and a tilting component 4. The weighing component 1 is used to weigh the raw materials, primarily to achieve precise proportioning of the two materials and ensure that the proportion deviation does not exceed ±5% of the standard range. The mixing component 2 is used to stir the mixed raw materials. During the stirring process, the liquid raw materials are thoroughly mixed by a stirrer to ensure complete liquefaction. The spraying component 3 is used to spray the foaming agent onto the pipe fittings. The tilting component 4 is used to tilt the pipe fittings to be sprayed along their own axis, thereby ensuring that the surface of the pipe fittings is evenly coated with the foaming agent, thus forming an insulation layer.

[0033] refer to Figure 3 The weighing assembly 1 includes a weighing base 101, a weight sensor, and a weighing bucket 102. The weighing base 101 is placed on the ground. The weight sensor is installed inside the weighing base 101 and is used to sense the weight of the weighing bucket 102. The weighing bucket 102 is placed on the weighing base 101. The raw materials are placed inside the weighing bucket 102, and the accurate weighing of the raw materials is finally achieved.

[0034] refer to Figures 4 to 6 The mixing assembly 2 includes a transfer tank 201, a mixing tank 202, a mixing driver 203, a stirrer 204, a mixing driver 205, a stirrer, and a heating module. The transfer tank 201 is located below the mixing tank 202. The bottom of the mixing tank 202 is connected to the transfer tank 201 via pipes and valves. The heating module is located outside the transfer tank 201 and the mixing tank 202 and is used to provide heat. The stirring driver 203 and the mixing driver 205 are located on the top surface of the outer side of the mixing tank 202 (i.e., the mixing tank 202 has a top cover, and the stirring driver 203 and the mixing driver 205 are placed on the top cover). The agitator 204 is rotatably disposed inside the mixing tank 202 and is connected to the output end of the stirring driver 203. The stirring driver 203 provides rotational power to the agitator 204. The agitator 204, through rotation, transforms the raw material into a foaming agent under heating. The mixer moves back and forth linearly along the axial direction of the mixing tank 202. The output end of the mixing driver 205 is connected to the mixer and is used to provide reciprocating power to the mixer.

[0035] refer to Figures 4 to 6The mixer includes an inner mixing sleeve 206, a mixing plate 207, and an outer mixing sleeve 208. The outer mixing sleeve 208 is fitted over the inner mixing sleeve 206. One end of the mixing plate 207 is connected to the inner mixing sleeve 206, and the other end of the mixing plate 207 is connected to the outer mixing sleeve 208. There are multiple mixing plates 207, and there are gaps between adjacent mixing plates 207. During the up-and-down movement of the mixer, the liquid foaming agent in the mixing tank 202 can be mixed evenly.

[0036] Since the stirrer 204 is located above the mixing tank 202, it only needs to stir the liquid foaming agent above the mixing tank 202. In this case, the power of the stirring driver 203 does not need to be too high, and the size of the stirrer 204 can also be set to be relatively small. Combined with the timed up-and-down reciprocating movement of the agitator, the liquid foaming agent in the mixing tank 202 can be mixed evenly from top to bottom.

[0037] The spraying assembly 3 includes a spray gun 301, which can reciprocate along the axial direction of the pipe. During the movement, the spray gun 301 can spray a foaming agent onto the pipe to form an insulation layer on the outside of the pipe.

[0038] The flipping component 4 is located on the side of the spraying component 3. A pipe is placed on the flipping component 4. The pipe can rotate. During the rotation, the spraying component 3 can form an insulation layer on the surface of the pipe.

[0039] The above technical solution can achieve stable system operation at low cost while coating the surface of the pipe fittings with a heat insulation layer. It will not burn out the motor due to large stirring volume or cause excessive production and maintenance costs due to large motor power.

[0040] refer to Figure 6 To further improve the mixing effect within the mixing tank 202, multiple mixing plates 207 are divided into two layers. Simultaneously, there are two mixing jackets 208: the upper mixing plate 207 corresponds to the upper mixing jacket 208, and the lower mixing plate 207 corresponds to the lower mixing jacket 208. Dividing the mixing plates 207 into two layers effectively increases the contact area between the mixing plates 207 and the liquid foaming agent within a limited area, thereby enhancing the fluidity of the liquid foaming agent.

[0041] refer to Figure 5 and Figure 6In order to increase the fluidity of the liquid foaming agent during the up-and-down movement of the agitator, the agitator plate 207 is set to be inclined, and the agitator plate 207 forms a certain angle with the cross-section of the mixing tank 202. When the agitator plate 207 moves back and forth along the axis of the mixing tank 202, the agitator plate 207 pushes the liquid foaming agent to move. During the pushing process, the liquid foaming agent is fully flowed and mixed in the mixing tank 202.

[0042] refer to Figure 5 To ensure a reliable connection between the mixer and the mixer driver 205, an ear plate is provided on the inner mixing sleeve 206. The ear plate is located above the mixing plate 207 and is connected to the drive end of the mixer driver 205. The mixer driver 205 is typically a cylinder, and the push end of the cylinder is connected to the ear plate.

[0043] Since the mixer needs to push up and press down the liquid foaming agent, in order to facilitate the stable movement of the mixer in the mixing tank 202, a conical pusher protrusion 209 is provided at the bottom of the mixing inner sleeve 206. The pusher protrusion 209 can push away the liquid foaming agent, thereby reducing the resistance encountered by the mixing inner sleeve 206 during the descent.

[0044] refer to Figure 6 The agitator 204 includes an agitator shaft and agitator blades. The agitator shaft is connected to the output end of the agitator driver 203. The top end of the agitator shaft is connected to the agitator 204 (motor) via a coupling. A bearing is provided at the connection between the agitator shaft and the agitator tank 202. The agitator blades are cage-shaped and connected to the lower end of the agitator shaft. After the agitator blades rotate, they can fully agitate the liquid foaming agent.

[0045] refer to Figure 7 The spraying assembly 3 also includes a spraying truss 302, a spraying traveling plate 303, a spraying traveling drive component, and a spraying robotic arm 304. The spraying truss 302 is mounted on the ground. The spraying traveling plate 303 moves along a straight line on the spraying truss 302. The spraying traveling drive component includes a motor and traveling wheels. The motor is mounted on the spraying traveling plate 303, and the traveling wheels are rotatably mounted on the spraying traveling plate 303. The motor drives the traveling wheels to rotate, allowing the spraying traveling plate 303 to move along the spraying truss 302. The fixed end of the spraying robotic arm 304 is connected to the spraying traveling plate 303, and the actuating end of the spraying robotic arm 304 is used to fix the spray gun 301. The spraying robotic arm 304 can adjust the angle of the spray gun 301, thereby ensuring that the spray angle of the spray gun 301 can be applied to pipes of different diameters, avoiding uneven spraying or waste of materials.

[0046] refer to Figure 1 and Figure 8The flipping assembly 4 includes a flipping bracket 401, flipping wheels 402, and a flipping drive 403. The flipping bracket 401 is placed on the ground, and there are multiple flipping brackets arranged side by side. There are multiple flipping wheels 402, which are rotatably mounted on the top of the flipping bracket 401. The flipping drive 403 is located on the side of the end of the flipping bracket 401. The flipping drive 403 has a rotating drive end that passes into the pipe and rotates the pipe. The flipping wheels 402 are used to provide support when the pipe rolls.

[0047] To accommodate different pipe fittings, the flip bracket 401 is shaped like scissors. This design allows the top of the flip bracket 401 to move vertically, ultimately enabling pipe fittings of different diameters to be fully and efficiently coated.

[0048] This application also discloses a spraying and foaming process for a rigid polyurethane insulation layer, including the following steps: S1. Raw material preparation and weighing: Isocyanate raw material and polyether composite raw material are respectively put into the weighing bucket 102 of the weighing component 1, and the two raw materials are weighed independently by the weight sensor. The required mass of each raw material is obtained according to the preset ratio. S2. Preheating and feeding: Start the heating module to preheat the mixing tank 202 and the transfer tank 201, put the two sets of weighed raw materials into the mixing tank 202, and control the temperature inside the mixing tank 202 to the preset foaming temperature range. S3. Stirring and Mixing: Start the stirring driver 203 to drive the stirrer 204 to rotate in the upper area of ​​the mixing tank 202 to rotate and stir the liquid raw materials; at the same time, start the mixing driver 205 to drive the mixer to move back and forth along the axis of the mixing tank 202. During the movement of the mixer, the mixing plate 207 pushes the liquid foaming agent to flow in the mixing tank 202. The outer edge of the mixing jacket 208 moves against the inner wall of the mixing tank 202 to scrape off the material attached to the wall. The stirrer 204 moves upward with the mixer and penetrates into the mixing inner sleeve 206 to form a spatial nesting fit with the mixer, so as to perform compound mixing of materials in different areas of the mixing tank 202 until the two sets of raw materials are fully mixed to form liquid foaming agent. S4. Transfer and storage: Open the bottom pipeline valve of the mixing tank 202 to discharge the well-mixed liquid foaming agent into the transfer tank 201. The temperature of the liquid foaming agent in the transfer tank 201 is kept constant by the heating module. S5. Fitting clamping and flipping: Place the fitting to be sprayed on the flipping bracket 401 of the flipping assembly 4, so that the outer edge of the flipping wheel 402 contacts the outer wall of the fitting. Adjust the top height of the scissor-shaped flipping bracket 401 so that the axis of the fitting is parallel to the spraying trajectory of the spraying assembly 3. Start the flipping drive 403. The output end of the flipping drive 403 enters the interior of the fitting and drives the fitting to rotate at a constant speed around its own axis. S6. Spraying and foaming molding: The spraying walking drive is activated to drive the spraying walking plate 303 to move at a constant speed along the length of the spraying truss 302. At the same time, the spraying angle of the spraying gun 301 is adjusted by the spraying robotic arm 304 so that the spraying gun 301 maintains a preset spraying distance and perpendicularity with the surface of the pipe. The spraying gun 301 continuously sprays the liquid foaming agent in the transfer tank 201 onto the outer wall of the uniformly rotating pipe through the pipeline. The liquid foaming agent foams and solidifies on the surface of the pipe to form a rigid polyurethane insulation layer.

[0049] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A spraying and foaming equipment for rigid polyurethane insulation layers, characterized in that, include: The weighing assembly (1) includes a weighing base (101), a weight sensor and a weighing bucket (102). The weight sensor is disposed inside the weighing base, and the weighing bucket (102) is disposed on the weighing base (101). The weighing bucket (102) is used to weigh two different raw materials. The mixing assembly (2) includes a transfer tank (201), a mixing tank (202), a mixing driver (203), a stirrer (204), a mixing driver (205), a mixer, and a heating module. The mixing tank (202) is located above the transfer tank (201). The mixing tank (202) is connected to the transfer tank (201) via a pipe and valve at its bottom. The mixing driver (203) and the mixing driver (205) are both located at the top outer side of the mixing tank (202). The stirrer (204) is rotatably located inside the mixing tank (202) at its upper part. The mixer is slidably located inside the mixing tank (202) at its lower part along the axial direction of the mixing tank (202). The mixing driver (203) is used to drive the stirrer (204) to rotate. The driver (205) is used to drive the stirrer to move back and forth. The heating modules are respectively set outside the transfer tank (201) and the mixing tank (202). The stirrer includes a stirring inner sleeve (206), a stirring plate (207), and a stirring outer sleeve (208). The stirring outer sleeve (208) is fitted outside the stirring inner sleeve (206). One end of the stirring plate (207) is connected to the stirring inner sleeve (206), and the other end is connected to the stirring outer sleeve (208). There are multiple stirring plates (207) and they are evenly distributed in a circumferential manner. Adjacent stirring plates (207) are spaced apart. The outer edge of the stirring outer sleeve (208) is attached to the inner wall of the mixing tank (202). After moving, the stirrer (204) can penetrate into the interior of the stirring inner sleeve (206). The spraying assembly (3) includes a spray gun (301) that moves back and forth in a straight line, the spray gun (301) being used to spray a foaming agent onto the pipe to be sprayed to form an insulation layer; A flipping assembly (4) is disposed on the side of the spraying assembly (3). The pipe to be sprayed is placed on the flipping assembly (4), and the flipping assembly (4) is used to make the pipe rotate around its own axis.

2. The spraying and foaming equipment for rigid polyurethane insulation layer according to claim 1, characterized in that: The multiple mixing plates (207) are divided into two layers, and there are two mixing jackets (208). The two mixing jackets (208) are coaxial and spaced apart. The mixing plate (207) in the upper layer corresponds to the mixing jacket (208) above it, and the mixing plate (207) in the lower layer corresponds to the mixing jacket (208) below it.

3. The spraying and foaming equipment for rigid polyurethane insulation layer according to claim 2, characterized in that: The stirring plates (207) are all inclined and have the same inclination angle.

4. The spraying and foaming equipment for rigid polyurethane insulation layer according to claim 3, characterized in that: The mixing inner sleeve (206) is provided with an ear plate, which is located above the mixing plate (207) and is connected to the driving end of the mixing driver (205).

5. The spraying and foaming equipment for rigid polyurethane insulation layer according to claim 4, characterized in that: The bottom of the mixing inner sleeve (206) is provided with a conical pusher protrusion (209), which is used to push the flowing foaming agent.

6. The spraying and foaming equipment for rigid polyurethane insulation layer according to claim 5, characterized in that: The stirrer (204) includes a stirring shaft and stirring blades. The stirring shaft is connected to the output end of the stirring driver (203), and the stirring blades are cage-shaped and connected to the stirring shaft.

7. A spraying and foaming equipment for rigid polyurethane insulation layer according to any one of claims 1-6, characterized in that: The spraying assembly (3) further includes a spraying truss (302), a spraying walking plate (303), a spraying walking drive component, and a spraying robotic arm (304). The spraying truss (302) is set on the ground and its length direction is consistent with the axial direction of the pipe to be sprayed. The spraying walking plate (303) is slidably set on the spraying truss (302). The spraying walking drive component is set on the spraying walking plate (303) and is used to provide power for the spraying walking plate (303) to move. The spraying robotic arm (304) is set on the spraying walking plate (303). The spray gun (301) is set on the execution end of the spraying robotic arm (304). The spray gun (301) is connected to the transfer tank (201) through a pipeline.

8. A spraying and foaming equipment for rigid polyurethane insulation layer according to any one of claims 1-6, characterized in that: The flipping assembly (4) includes a flipping bracket (401), a flipping wheel (402), and a flipping drive (403). There are multiple flipping brackets (401) arranged side by side. The flipping wheel (402) is rotatably disposed at the top of the flipping bracket (401). The outer edge of the flipping wheel (402) contacts the pipe to be sprayed. The flipping drive (403) is disposed on the side of one end of the flipping bracket (401). The output end of the flipping drive (403) is inserted into the interior of the pipe to be sprayed and is used to drive the pipe to be sprayed to rotate.

9. The spraying and foaming equipment for a rigid polyurethane insulation layer according to claim 8, characterized in that: The flip-up bracket (401) is scissor-shaped and its top can move vertically.

10. A spraying and foaming process for a rigid polyurethane insulation layer, applied to the spraying and foaming equipment for a rigid polyurethane insulation layer as described in any one of claims 1-9, characterized in that: Includes the following steps: S1. Raw material preparation and weighing: Isocyanate raw material and polyether composite raw material are respectively put into the weighing bucket (102) of the weighing component (1), and the two raw materials are weighed independently by the weight sensor. The required mass of each raw material is obtained according to the preset ratio. S2. Preheating and feeding: Start the heating module to preheat the mixing tank (202) and the transfer tank (201), and put the two sets of raw materials that have been weighed into the mixing tank (202) and control the temperature inside the mixing tank (202) to the preset foaming temperature range. S3. Stirring and mixing: Start the stirring driver (203) to drive the stirrer (204) to rotate in the upper area of ​​the mixing tank (202) to rotate and stir the liquid raw materials; at the same time, start the mixing driver (205) to drive the stirrer to move back and forth along the axis of the mixing tank (202). During the movement of the stirrer, the stirring plate (207) pushes the liquid foaming agent to flow in the mixing tank (202). The outer edge of the stirring jacket (208) moves against the inner wall of the mixing tank (202) to scrape off the material attached to the wall. The stirrer (204) moves upward with the stirrer and enters the inner sleeve (206) of the stirring jacket, forming a spatial nesting fit with the stirrer to perform compound mixing of materials in different areas of the mixing tank (202) until the two sets of raw materials are fully mixed to form a liquid foaming agent. S4, Transfer and storage: Open the bottom pipeline valve of the mixing tank (202) and discharge the well-mixed liquid foaming agent into the transfer tank (201). The temperature of the liquid foaming agent in the transfer tank (201) is kept constant by the heating module. S5. Fitting clamping and flipping: Place the fitting to be sprayed on the flipping bracket (401) of the flipping assembly (4), so that the outer edge of the flipping wheel (402) contacts the outer wall of the fitting, adjust the top height of the scissor-shaped flipping bracket (401) so that the axis of the fitting is parallel to the spraying trajectory of the spraying assembly (3), start the flipping drive (403), the output end of the flipping drive (403) enters the interior of the fitting and drives the fitting to rotate at a constant speed around its own axis; S6. Spraying and foaming: Start the spraying walking drive to drive the spraying walking plate (303) to move at a constant speed along the length of the spraying truss (302). At the same time, adjust the spraying angle of the spray gun (301) through the spraying robot arm (304) so ​​that the spray gun (301) maintains a preset spraying distance and perpendicularity with the surface of the pipe. The spray gun (301) continuously sprays the liquid foaming agent in the transfer tank (201) onto the outer wall of the pipe that is rotating at a constant speed through the pipeline. The liquid foaming agent foams and solidifies on the surface of the pipe to form a rigid polyurethane insulation layer.

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