Foaming device for polyurethane foamed thermal insulation pipe

Abstract

The application provides a polyurethane foaming heat preservation pipe heat preservation layer foaming device, and belongs to the technical field of heat preservation pipe foaming. The device is characterized by comprising a device shell, an injection shell arranged on the top of the device shell, an injection cavity arranged in the injection shell, an injection assembly installed in the injection cavity for circumferentially injecting foaming material into the outer pipe, a rotating shaft sleeve and four injection pipes arranged on the injection assembly, the four injection pipes being respectively arranged in four injection openings on the side of the outer pipe, two pipe clamps respectively arranged on the two sides of the injection assembly for sequentially arranging the outer pipe and the inner pipe in the injection assembly and rotating the outer pipe and the inner pipe during the foaming process, and a control module for controlling the operation of the device. Through the synergistic effect of circumferential synchronous injection and rotating foaming reaction, the foaming material can be uniformly filled into the annular space between the outer pipe and the inner pipe, the problem of local material excess or deficiency is avoided, the consistency of the overall density of the heat preservation layer is ensured, and the problem of unbalanced pipeline heat insulation effect caused by uneven density is avoided.

Description

Technical Field

[0001] This invention belongs to the field of thermal insulation pipe foaming technology, and more specifically, it relates to a polyurethane foam thermal insulation pipe insulation layer foaming device. Background Technology

[0002] Polyurethane foam insulated pipes are widely used in various industrial and civil pipeline systems for heating, cooling, oil transportation, and gas transportation due to their excellent thermal insulation performance, ease of construction, and corrosion resistance. They typically consist of an inner pipe, an outer pipe, and a polyurethane insulation layer filling the space between them. The quality of the insulation layer directly affects the pipe's insulation efficiency and service life.

[0003] Currently, most mainstream insulation foaming devices in the industry fill the annular area between the inner and outer tubes with foaming material through a single injection port or segmented injection method. For example, Chinese invention patent No. 202110752532.0 provides a polyurethane insulation composite pipe and its forming device. The foaming extruder head has a circular hole in the middle that matches the diameter of the inner tube, and an outer tube extruder head is rotatably sleeved on the outside of the foaming extruder head. A spray box is provided on one side of the tail end of the foaming extruder head. This invention can achieve simultaneous wrapping and filling of the outer tube and polyurethane insulation layer while the inner tube passes through through the cooperative structure of the foaming extruder head and the outer tube extruder head. This allows the inner tube, polyurethane insulation layer and outer tube to be formed synchronously in a certain area, which is more efficient and results in a higher overall integrity of the formed pipe.

[0004] However, while traditional foaming devices achieve simultaneous molding of the inner tube, insulation layer, and outer tube, they often employ a single-sided or one-end injection mode to ensure the uniformity of foam material filling. In the single-sided injection mode, the foam material relies on its own flow and expansion within the annulus to fill, and under gravity, it tends to concentrate towards the bottom, resulting in a higher density at the bottom and a lower density at the top of the insulation layer, or even gaps due to incomplete filling at the top. In the one-end injection mode, the foam material's contact sequence and pressure distribution with the annulus wall are uneven as it propels from one end to the other, easily leading to localized density concentrations and loose areas. This affects the overall consistency of the insulation layer structure, causing porosity, delamination, and uneven density, resulting in an imbalance in the overall insulation effect of the pipeline. Localized gaps or loose areas easily become weak points for heat transfer. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a polyurethane foam insulation pipe insulation layer foaming device. This device solves the technical problem in the prior art where traditional foaming devices use a single-sided or one-end injection mode, which easily leads to local density concentration and local looseness after the foaming material reacts to form the insulation layer, resulting in an imbalance in the overall insulation effect of the pipe.

[0006] The purpose and effect of the polyurethane foam insulation pipe insulation layer foaming device of the present invention are achieved by the following specific technical means:

[0007] A polyurethane foam insulation pipe insulation layer foaming device, comprising:

[0008] The equipment casing has a foaming platform on top, an injection casing on top of the foaming platform, an injection cavity inside the injection casing, and assembly holes communicating with the injection cavity on both sides of the injection casing.

[0009] The filling assembly is installed in the injection chamber and is used to fill the outer tube with foaming material in the circumference. The filling assembly includes a rotating bushing sleeved on the outer tube and four sets of filling tubes, which are respectively inserted into four sets of filling ports on the circumference of the outer tube.

[0010] Two sets of pipe clamps are installed on both sides of the filling assembly. The pipe clamps are installed on the top of the foaming platform through a linear module. The pipe clamps are used to sequentially insert the outer pipe and inner pipe into the filling assembly and rotate the outer pipe and inner pipe during the foaming process.

[0011] The control module is installed on the equipment housing and is used to control the operation of the device.

[0012] According to a preferred embodiment, the filling component includes a mounting plate and a drive plate. A mounting sleeve is provided at one end of a rotating sleeve. The mounting plate is installed between the mounting sleeve and the rotating sleeve by multiple sets of screws. The drive plate is rotatably sleeved on the rotating sleeve. The mounting plate, the drive plate and the rotating sleeve are located on the same axis.

[0013] The mounting plate has four sets of through grooves on one side, which are radially distributed. Each of the four filling tubes has a slider at one end. The sliders are located at the filling position or the blocking position of the four grooves respectively. There is a gap between the mounting sleeve and the rotating sleeve. Each of the four grooves has a sliding hole at the bottom that communicates with the gap.

[0014] When the slider is in the blocking position, the bottom ends of the four sets of filling tubes pass through the four sets of sliding holes and are installed in the gap.

[0015] When the slider is in the filling position, the bottom ends of the four sets of filling tubes pass through the four sets of sliding holes and gaps and are installed inside the outer tube.

[0016] According to a preferred embodiment, two sets of sealing rings are provided around the mounting plate, and a groove is provided between the mounting plate and the two sets of sealing rings to form a flow cavity. A threaded interface pipe head is provided on the outer side of one set of sealing rings. The threaded interface pipe head is connected to the discharge end of the polyurethane foam extruder through a pipeline. A sealing ring is provided between the two sets of sealing rings and the mounting plate.

[0017] The four sets of chutes have a flow channel on one side that communicates with the flow cavity. The filling pipe and the slider have a filling channel that communicates with each other. The bottom of the filling pipe has a filling outlet that communicates with the filling channel. The filling outlet is equipped with a discharge check valve. The slider has a baffle plate on one side and a through groove at the bottom of the slider corresponding to the baffle plate.

[0018] When the slider is in the blocking position, one side of the blocking plate is in contact with the flow channel in the chute, and the flow channel is not connected to the filling channel.

[0019] When the slider is in the filling position, the baffle plate passes through the through groove and is installed in the gap, and the flow channel is connected to the filling channel to make connection.

[0020] According to a preferred embodiment, four sets of centripetal spiral grooves are opened on one side of the drive disk corresponding to four sets of sliding grooves, a sliding rod is provided on one side of the slider, the sliding rod is slidably connected to the spiral groove, a first pulley is provided on the periphery of the drive disk, a second pulley is provided at the end of the rotating bushing away from the mounting disk, and a first motor and a second motor are provided inside the filling housing, both of which are electrically connected to the control module.

[0021] The first motor is connected to the first pulley via the first belt mechanism and is used to rotate the drive disc to move the slider between the blocking position and the filling position.

[0022] The second motor is connected to the second pulley via the second belt mechanism and is used to rotate the rotating bushing so that the mounting plate and the four sets of filling pipes can rotate along with the outer and inner pipes during the foaming process.

[0023] According to a preferred embodiment, two sets of arc-shaped mounting grooves are provided on one side of the mounting plate, and ratchet racks are provided in both sets of mounting grooves. A locking through groove is provided on one side of the drive plate corresponding to the two sets of ratchet racks. A locking box is slidably disposed in the locking through groove. A first sliding groove is provided on one side of the locking box. One end of the locking ratchet block is slidably connected to the first sliding groove, and the other end is engaged with the ratchet rack. A locking spring is provided between the bottom of the locking box and the locking ratchet block.

[0024] A fixing seat is provided at the top of the locking box, and an electric telescopic rod is provided between the fixing seat and the drive plate.

[0025] According to a preferred embodiment, a second sliding groove is also provided on the periphery of the filling pipe, the sealing plate is slidably connected to the second sliding groove, a sealing plate is provided on one side of the sealing plate, and a sealing spring is provided between the mounting plate and the sealing plate.

[0026] When the slider is in the blocking position, the sealing plate seals the filling outlet;

[0027] When the slider is in the filling position, the sealing plate does not block the filling outlet, and the sealing plate seals the filling outlet on the periphery of the outer pipe;

[0028] When the foaming material is added and rotated for foaming, the slider is located between the blocking position and the filling position. The sealing plate seals the filling outlet, and at the same time, the sealing plate continues to seal the filling port on the periphery of the outer tube to complete the foaming.

[0029] According to a preferred embodiment, the pipe clamp includes four sets of rotating clamping columns for clamping the outer or inner pipe, a track seat is provided on the top of the foaming platform, and a linear module and guide rail are provided on the track seat. The bottom of the sliding plate is slidably connected to the guide rail and fixedly connected to the electric slider of the linear module.

[0030] The top of the sliding plate is equipped with two sets of columns connected to the top plate. There are two sets of relatively movable blocks between the sliding plate and the top plate. Each set of movable blocks has two sets of rotating holes on one side, and each rotating hole contains a bearing. One end of each of the four sets of rotating clamping columns passes through the four sets of bearings.

[0031] According to a preferred embodiment, two sets of guide rods are provided between the sliding plate and the top plate, two sets of moving blocks are slidably connected to the two sets of guide rods, a clamping motor is provided on the top of the top plate, the main shaft of the clamping motor passes through the top plate and is connected to a double threaded rod, and the threaded holes on the two sets of moving blocks are respectively connected to the positive thread section and the reverse thread section of the double threaded rod.

[0032] One side of one set of moving blocks is equipped with an installation frame, and two sets of rotatable sprockets are installed inside the installation frame. The two sets of sprockets are connected by a chain. A transfer motor is installed on one side of the installation frame. The main shaft of the transfer motor is connected to one of the sets of sprockets and is used to insert the clamped outer tube or inner tube into the filling assembly.

[0033] According to a preferred embodiment, one set of columns is provided with two sets of rotating seats on one side, and a closed frame located in a closed position or a clearance position is rotatably provided between the two sets of rotating seats. A switching motor is provided at the top of the top plate, and the main shaft of the switching motor is connected to the closed frame. Two sets of rotating clamps are provided on the other side of the closed frame, and a rotating ring is rotatably provided between the two sets of rotating clamps. A blocking plate is connected to the side of the rotating ring away from the closed frame through multiple sets of connecting rods. A sealing layer is provided on one side of the blocking plate between the outer tube and the inner tube. An inner tube through hole is opened on the blocking plate and the side of the closed frame. Two sets of limiting blocks are provided on one side of the closed frame. A rotating gear is provided on one side of the blocking plate. A rotating motor is provided on one side of the closed frame, and a gear is provided on the main shaft of the rotating motor to mesh with the rotating gear.

[0034] When the closed frame is in the clearance position, the blocking plate and the closed frame do not coincide with the rotation axis of the inner tube and the outer tube;

[0035] When the closed frame is in the closed position, the sealing layer seals the opening at the end of the outer tube. The plugging plate and the closed frame are both located on the rotation axis of the inner tube and the outer tube, and the inner tube is inserted into the inner tube perforation.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. Through the arrangement of the filling components, four sets of filling tubes are radially distributed within the grooves of the mounting plate. Each set of filling tubes can switch its working state by the movement of the slider. When the slider moves to the filling position under the guidance of the spiral groove of the drive plate, the four sets of filling tubes can simultaneously pass through the filling port on the periphery of the outer tube and penetrate into the annular region between the inner and outer tubes. At the same time, the grooves between the two sets of sealing rings on the periphery of the mounting plate and the mounting plate form a flow cavity. The foaming material conveyed by the polyurethane foam extruder enters the flow cavity through the threaded interface tube head and can simultaneously enter the filling channels of the four sets of filling tubes through the four flow channels connected to the flow cavity. Finally, it is injected into the annulus from the filling outlet, allowing the foaming material to flow from all sides of the annulus. The material diffuses in a synchronous manner, rather than being propelled from a single direction by a traditional foaming device, preventing material from focusing at the bottom of the annulus. In addition, the sealing plate around the filling pipe, under the action of the sealing spring, can block the filling port of the outer pipe, preventing the foaming material from leaking from the filling port during the filling process; the one-way valve in the filling outlet can prevent the foaming material from flowing back into the flow channel, ensuring that the amount of material output from each set of filling pipes is uniform and stable. Through the synergistic effect of circumferential synchronous filling, multi-channel distribution and sealing plate sealing, the foaming material can be evenly filled into every area of ​​the annulus, without local over- or under-filling of material, thereby ensuring the consistency of the overall density of the insulation layer and avoiding the problem of unbalanced pipe insulation effect caused by uneven density.

[0038] 2. During the filling stage, the second motor of the device drives the rotating bushing to rotate via the second belt mechanism, causing the mounting plate, drive plate, and four sets of filling pipes to rotate synchronously with the inner and outer pipes. This ensures that the filling pipes remain relatively stationary with the outer and inner pipes during the filling process, preventing localized material accumulation due to relative motion. The rotating motor drives the rotating ring and the blocking plate to rotate via gear transmission, which in turn drives the inner and outer pipes to rotate. This allows the foaming material in the annular space to be evenly diffused to all corners of the annular space under the centrifugal force generated by the rotation. Through the revolution of the filling components with the outer and inner pipes, combined with the rotation of the outer and inner pipes, the foaming material is subjected to uniform propulsion and centrifugal force in the annular space, which can quickly fill the annular space. To prevent gaps and local voids caused by differences in flow rate of the foaming material, the rotation of the outer tube, inner tube, and filling components continues even after the foaming reaction begins. Even if the foaming material undergoes volume changes due to the reaction, the continuous rotation ensures that the material remains uniformly distributed before curing, preventing local shrinkage or accumulation due to differences in reaction rate. This further guarantees the integrity and density consistency of the insulation layer structure. Compared to traditional foaming devices that allow the material to stand still after filling, this device's rotational coordination eliminates potential density deviations during the foaming reaction, ensuring that the density of the insulation layer remains consistent from the inside out and from one end to the other, thus improving the overall thermal insulation performance of the pipeline.

[0039] 3. The sealing plate around the filling pipe, under the elastic force of the sealing spring, can tightly fit against the outer wall of the outer pipe, sealing the filling port on the outer pipe and preventing the foaming material from leaking out during the filling process. Secondly, the one-way valve installed in the filling outlet can control the flow direction of the foaming material, allowing only the foaming material to be injected into the annulus from the filling channel, avoiding backflow of material into the flow channel due to rotation of the outer and inner pipes or pressure fluctuations, which would cause blockage of the flow channel. Furthermore, the sealing ring installed between the mounting plate and the two sets of sealing rings can ensure... The airtight design of the flow chamber prevents leakage of foaming material within the chamber, ensuring that all material flows through the channel into the filling tube. The device achieves locking through the engagement of a ratchet rack and locking pin. When the drive disc rotates and pushes the slider to the filling position, the locking pin inside the locking box engages with the ratchet rack on the mounting plate under the action of the locking spring, fixing the relative angle between the mounting plate and the drive disc. This ensures that the four filling tubes remain in the preset filling position during the filling process, preventing displacement due to vibration or centrifugal force caused by tube rotation. To switch to the blocking position, the electric telescopic rod pushes the locking box, separating the locking pin from the ratchet rack. The drive disc can then be rotated in the opposite direction to adjust the slider position. This combination of sealing and locking not only ensures no material leakage and no channel blockage during filling but also guarantees stable filling tube position, reducing local density anomalies in the insulation layer caused by filling deviations. This improves the stability and reliability of the filling process, providing a solid guarantee for the quality of the insulation layer molding.

[0040] 4. The device features a switchable closed frame on one side of the pipe clamp. After the outer and inner pipes are inserted into the filling assembly, the switching motor drives the closed frame to rotate around the rotating seat to the closed position. At this time, the plugging plate on the closed frame will fit against the end of the outer pipe, and the sealing layer on one side of the plugging plate can fill the gap between the outer and inner pipes, forming a reliable seal to prevent leakage of foaming material from the end during the filling and foaming process. Simultaneously, the plugging plate and the inner pipe perforation on the closed frame allow the inner pipe to pass through and remain coaxial with the outer pipe, avoiding pipe eccentricity caused by the end-sealing structure, which would affect the uniformity of the annular space. During the foaming process, the rotating motor can drive the rotating ring to rotate via gear transmission. The rotating ring is fixedly connected to the plugging plate via a connecting rod, thereby driving the plugging plate to rotate synchronously with the inner and outer pipes. The rotation of the inner and outer pipes prevents the foaming material from accumulating at the end, ensuring that the foaming material maintains the same flow rate and reaction rhythm at the end and middle, ensuring that the material filling amount and curing speed of the annular space at the end are consistent with those in the middle, preventing looseness or gaps at the end. In addition, the limiting block on one side of the closed frame can limit the rotation angle of the closed frame, ensuring that the plugging plate can be coaxial with the pipe body every time it switches to the closed position, further ensuring the stability of the end sealing and material distribution. Through the synergy of end sealing and rotation, the density and structural integrity of the insulation layer at both ends are kept consistent with the middle, thereby improving the overall thermal insulation performance of the pipeline.

[0041] 5. When the clamping motor at the top of the top plate drives the double threaded rod to rotate, the two sets of moving blocks will move relative to each other along the positive and negative thread sections of the double threaded rod under the restriction of the guide rod. This will cause the four sets of rotating clamping columns to move synchronously closer to or away from the outer and inner tubes. This symmetrical clamping ensures that the outer and inner tubes are subjected to uniform clamping force, avoiding deformation or displacement of the tube body due to excessive force on one side. At the same time, the multi-point clamping of the four sets of clamping columns can prevent the inner and outer tubes from loosening during the injection process. The track seat at the top of the foaming platform is equipped with parallel linear modules and guide rails. The bottom of the sliding plate is slidably connected to the guide rails and fixed to the electric slider of the linear module. When the linear module is in operation... During operation, the sliding plate and the top pipe clamp can be moved smoothly along the guide rail, thereby pushing the clamped inner or outer pipe into the rotating bushing of the filling component. In addition, a sprocket and chain drive structure is set in the mounting frame on one side of one of the moving blocks. The transfer motor can drive the chain to rotate by driving the sprocket, thereby driving the two sets of rotating clamps to rotate, providing a smooth propulsion force for the insertion of the outer and inner pipes, preventing deviation due to uneven thrust during insertion. Through stable clamping and conveying, it is ensured that the inner and outer pipes remain coaxial after insertion. With the help of the blocking plate and the inner pipe perforation, it can ensure that the inner and outer pipes remain coaxial throughout the entire operation. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the assembled structure of the present invention;

[0043] Figure 2 This is a schematic diagram of the structure of the present invention after it has been unfolded;

[0044] Figure 3 This is a schematic diagram of the structure of the first motor, the second motor, and the drive disk assembled in this invention;

[0045] Figure 4 This is a schematic diagram of the disassembled structure of the first motor, the second motor, and the drive disk in this invention;

[0046] Figure 5 This is a schematic diagram of the structure of the installation disk and the drive disk after assembly in this invention;

[0047] Figure 6 This is a schematic diagram of the structure after the installation disk and drive disk are separated in this invention;

[0048] Figure 7 yes Figure 6 Enlarged view of region A in the middle;

[0049] Figure 8 This is a schematic diagram of the structure of the slide and slider after separation in this invention;

[0050] Figure 9 This is a cross-sectional view of the flow channel, flow cavity, and injection channel in this invention;

[0051] Figure 10 This is a schematic diagram of the structure after the spiral groove and sliding rod are assembled in this invention;

[0052] Figure 11 This is a schematic diagram of the structure after the spiral groove and sliding rod are separated in this invention;

[0053] Figure 12 yes Figure 11 Enlarged view of region B in the middle;

[0054] Figure 13 This is a schematic diagram of the structure of the sliding plate and guide rail after assembly in this invention;

[0055] Figure 14 This is a schematic diagram of the structure after the sliding plate and guide rail are separated in this invention;

[0056] Figure 15 This is a schematic diagram of the structure after the rotating clamping column and the moving block are assembled in this invention;

[0057] Figure 16 This is a schematic diagram of the structure after the rotating clamping column and the moving block are separated in this invention;

[0058] Figure 17 This is a schematic diagram of the structure after the blocking plate and the closed frame are separated in this invention.

[0059] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0060] 101. Equipment casing; 102. Foaming platform; 103. Filling casing; 104. Injection chamber; 105. Assembly hole; 106. Outer tube; 107. Filling port; 108. Inner tube; 109. Control module; 201. Rotating bushing; 202. Filling pipe; 203. Mounting plate; 204. Drive plate; 205. Mounting bushing; 206. Slide groove; 207. Slider; 208. Sliding hole; 209. Sealing ring; 210. Flow cavity; 211. Screw 212. Threaded connector; 213. Filling / discharging port; 214. Discharge check valve; 215. Baffle plate; 216. Through groove; 217. Spiral groove; 218. Sliding rod; 219. First pulley; 220. Second pulley; 221. First motor; 222. Second motor; 223. First belt mechanism; 224. Mounting slot; 225. Ratchet; 226. Locking through groove; 227. Locking housing; 228. First sliding rod 229. Groove; 230. Locking ratchet; 231. Locking spring; 232. Fixed base; 233. Electric telescopic rod; 234. Second sliding groove; 235. Sealing plate; 236. Sealing spring; 237. Sealing ring; 238. Flow channel; 301. Linear module; 302. Rotating clamping column; 303. Track base; 304. Guide rail; 305. Sliding plate; 306. Column; 307. Top plate; 308. Moving block; 309. Rotating hole; 310. Bearing; 311. Guide rod; 312. Clamping motor; 313. Double threaded rod; 314. Mounting frame; 315. Sprocket; 316. Chain; 317. Transfer motor; 318. Rotating seat; 319. Enclosed frame; 320. Rotating clamping block; 321. Rotating ring; 322. Blocking plate; 323. Sealing layer; 324. Inner tube perforation; 325. Limiting block; 326. Rotating gear; 327. Rotating motor; 328. Switching motor. Detailed Implementation

[0061] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the technical solutions of the present invention, but should not be used to limit the scope of protection of the present invention.

[0062] Example:

[0063] As attached Figures 1 to 17 As shown:

[0064] This invention provides a polyurethane foam insulation pipe insulation layer foaming device, including an equipment shell 101 installed at the work site. A foaming platform 102 is provided on the top of the equipment shell 101. Before use, it is necessary to check whether the support feet at the bottom of the equipment shell 101 are fully in contact with the ground and whether the foaming platform 102 is level. This is observed using a level; if a slight tilt is found on one side, the adjusting bolts of the support feet on that side of the equipment shell 101 are rotated until the foaming platform 102 is level. This prevents pipe misalignment or uneven distribution of foaming material due to the tilt of the foaming platform 102. An injection shell 103 is provided on the top of the foaming platform 102, and an injection cavity 104 formed inside the injection shell 103 is used for injection. The space for component operation and foaming is provided by the assembly holes 105 on both sides of the outer casing 103, which are connected to the injection cavity 104. These holes provide a passage for the outer tube 106 and inner tube 108 to pass through, ensuring the tubes can smoothly enter the injection cavity 104 and cooperate with the filling component. During use, a suitable bushing must be selected according to the diameter of the outer tube 106, and the bushing should be embedded into the assembly hole 105. The inner wall of the bushing should be smooth and without protrusions to allow the outer tube 106 to pass through smoothly without obstruction. The filling component is installed in the injection cavity 104 and is used to circumferentially fill the outer tube 106 with foaming material. The filling component includes a rotating bushing 201 sleeved on the outer tube 106 and four sets of filling tubes 202. The rotating bushing 201 is used to fill the foaming process... During the process, the filling component rotates synchronously with the outer tube 106 to avoid uneven filling caused by relative movement between the filling component and the tube body. Four sets of filling tubes 202 are respectively inserted into four sets of filling ports 107 around the outer tube 106, allowing foaming material to be injected simultaneously from all sides of the outer tube 106 into the annular space between the inner tube 108 and the outer tube 106. In use, the rotating bushing 201 must first be aligned with the axis of the outer tube 106, and then the outlet ends of the four sets of filling tubes 202 must be aligned with the four sets of filling ports 107 on the outer tube 106 to ensure that the filling tubes 202 can smoothly penetrate the filling ports 107 and extend into the annular area. In workshop production, one end of the outer tube 106 is first passed through the assembly hole 105 on one side of the filling housing 103. The outer tube 106 is pushed so that its middle part is located in the center of the injection cavity 104 and aligned with the middle part of the outer tube 106. The four sets of injection tubes 202 are respectively aligned with the injection ports 107 pre-opened on the periphery of the outer tube 106. Two sets of tube clamps are respectively installed on both sides of the injection assembly. The tube clamp linear module 301 is connected to the foaming platform 102. The linear module 301 can drive the tube clamp to move along the horizontal direction of the foaming platform 102 to realize the insertion and positioning of the outer tube 106 and the inner tube 108 into the injection cavity 104. The tube clamp is used to hold the outer tube 106 and the inner tube 108 to be inserted into the injection assembly in sequence. At the same time, it drives the outer tube 106 and the inner tube 108 to rotate during the foaming process to ensure that the foaming material is evenly distributed in the annulus.During use, the outer tube 106 is clamped by a pipe clamp, allowing it to pass through the assembly hole 105 and enter the injection chamber 104. Once the outer tube 106 is in place, the inner tube 108 is clamped and inserted inside the outer tube 106, ensuring that the axes of the inner tube 108 and the outer tube 106 coincide. The control module 109 is installed on the side of the equipment housing 101 and is electrically connected to the linear module 301 and the filling assembly. Its function is to control the entire operation of the device, including the clamping and movement of the pipe clamp, the start and stop of the filling assembly and its rotation speed, and the control of the foaming process. During use, parameters such as the filling volume, rotation speed, and foaming time are set according to the specifications of the produced insulation pipe and the characteristics of the foaming material.

[0065] Please see as follows Figure 5 , Figure 6 and Figure 7 As shown, the filling assembly includes a mounting plate 203 and a drive plate 204. A mounting sleeve 205 is provided at one end of the rotating sleeve 201. The mounting plate 203 is installed between the mounting sleeve 205 and the rotating sleeve 201 by multiple sets of screws. The screws must be evenly distributed around the circumference of the mounting plate 203 and tightened one by one to ensure that the mounting plate 203 does not loosen during subsequent rotation, thus preventing positioning deviation of the filling tube 202 due to misalignment of the mounting plate 203. The drive plate 204 is rotatably mounted on the rotating sleeve 201 via an inner bearing, allowing the drive plate 204 to rotate independently relative to the rotating sleeve 201. The mounting plate 203, drive plate 204, and rotating sleeve 201 must remain aligned. On the axis, to ensure that the movement direction of the subsequent filling tube 202 is adapted to the axis of the tube body; four sets of through-slide grooves 206 are provided on one side of the mounting plate 203. The four sets of slide grooves 206 are radially distributed, so that the four sets of filling tubes 202 can move in the centripetal or centrifugal direction to adapt to the position distribution of the filling port 107 on the periphery of the outer tube 106; a slider 207 is fixed at one end of each of the four sets of filling tubes 202. The slider 207 is slidably connected to the inner wall of the slide groove 206. The slider 207 can move along the slide groove 206 to the filling position or the blocking position under the drive of the drive plate 204. A gap is left between the mounting bushing 205 and the rotating bushing 201. A sliding hole 208 communicating with the gap is provided at the bottom of each of the four sets of slide grooves 206.

[0066] Specifically, when the slider 207 is in the blocking position, the bottom end of the filling tube 202 only passes through the sliding hole 208 and stays in the gap between the mounting sleeve 205 and the rotating sleeve 201, without communicating with the inside of the outer tube 106, and cannot be filled with material. When the slider 207 moves to the filling position, the bottom end of the filling tube 202 will pass through the sliding hole 208 and the gap in sequence and finally pass through the outer tube 106, communicating with the annular space between the inner tube 108 and the outer tube 106 to realize the filling of material. This allows the foaming material to diffuse from all sides of the annular space at the same time, rather than the traditional foaming device pushing from a single direction. This avoids the material from accumulating at the bottom of the annular space. By filling the foaming material in a circumferential synchronous manner, it can be evenly filled to every area of ​​the annular space, without the situation of excessive or insufficient material in some areas. This ensures the consistency of the overall density of the insulation layer and avoids the problem of unbalanced pipe insulation effect caused by uneven density.

[0067] Please see as follows Figure 7 , Figure 8 and Figure 9As shown, two sets of sealing rings 209 are provided around the periphery of the mounting plate 203. The groove between the mounting plate 203 and the two sets of sealing rings 209 forms a closed flow cavity 210. The function of the flow cavity 210 is to temporarily store the foaming material supplied from the polyurethane foaming extruder and to evenly distribute the foaming material to the four sets of flow channels 238. The threaded interface pipe head 211 on the outer side of one set of sealing rings 209 needs to be connected to the discharge end of the polyurethane foaming extruder through a pipeline. Two sets of sealing rings 237 are installed between the two sets of sealing rings 209 and the mounting plate 203. The sealing rings 237 need to be embedded in the pre-set sealing grooves of the mounting plate 203. Before installation, it is necessary to confirm that the specifications of the sealing rings 237 match the sealing grooves to ensure that the sealing rings 237 are completely attached to the groove wall without wrinkles or misalignment, so as to prevent the foaming material in the flow cavity 210 from leaking out of the gaps. At the same time, the mounting plate 203 and the two sets of sealing rings 209 can rotate relative to each other, so that the supply The material channel is adaptable to the rotary foaming insulation layer; the flow channels 238 on one side of the four sets of chute 206 are connected to the flow cavity 210, and the filling pipe 202 and the slider 207 have connected filling channels. The function of the flow channel 238 is to guide the foaming material in the flow cavity 210 to the filling channel of the filling pipe 202. The inner diameter of the flow channel 238 is the same as the inner diameter of the filling channel in the filling pipe 202. The bottom end of the filling pipe 202 has a filling outlet 212. The function of the filling channel is to transport the foaming material to the filling outlet 212. The function of the filling outlet 212 is to inject the foaming material in the filling channel into the annulus between the inner tube 108 and the outer tube 106. A discharge check valve 213 is installed in the filling outlet 212. The discharge check valve 213 is used to allow the foaming material to flow from the filling channel to the annulus only, preventing the material or air in the annulus from flowing back into the filling channel, which would cause blockage of the flow channel 238 or material contamination. A baffle plate 214 is provided on one side of the slider 207. The function of the baffle plate 214 is to control the opening and closing of the flow channel 238 and the filling channel. A through groove 215 is provided at the bottom of the slider 207 corresponding to the baffle plate 214. The size of the through groove 215 must match the baffle plate 214 to ensure that the baffle plate 214 passes through without jamming.

[0068] Specifically, when the slider 207 is in the blocking position, one side of the blocking plate 214 will contact the flow channel 238 in the groove 206. At this time, the blocking plate 214 will block the connection between the flow channel 238 and the filling channel, and the foaming material cannot enter the filling pipe 202. This state is used for preparation before filling or sealing after filling. When the slider 207 is moved to the filling position by the control module 109 driving the drive disk 204, the blocking plate 214 will pass through the through groove 215 and be installed in the gap between the mounting sleeve 205 and the rotating sleeve 201. At this time, the flow channel 238 and the filling channel are connected and foaming is achieved. The material can be injected into the annulus from the flow cavity 210 through the flow channel 238, the filling channel, and the filling outlet 212. During operation, it is necessary to confirm that the slider 207 has been completely moved to the filling position. This can be done by observing whether the mark on the slider 207 is aligned with the scale of the mounting plate 203. After alignment, the polyurethane foam extruder is started to deliver the material. The foam material flows through the flow cavity 210, the flow channel 238, and the filling channel in sequence, and is finally injected into the annulus between the inner tube 108 and the outer tube 106 from the filling outlet 212. The material delivery is stable throughout the process, with no leakage or blockage, ensuring the uniform formation of the insulation layer of the heating pipeline.

[0069] Please see as follows Figure 10 and Figure 11 As shown, four sets of centripetal spiral grooves 216 are formed on one side of the drive disk 204 corresponding to four sets of sliding grooves 206. A sliding rod 217 is provided on one side of the slider 207. The sliding rod 217 is slidably connected to the spiral grooves 216. The function of the sliding rod 217 is to transmit the rotational force of the drive disk 204 to the slider 207. The centripetal spiral grooves 216 can push the sliding rod 217 to move radially through the groove wall when the drive disk 204 rotates, thereby driving the slider 207 to switch to the blocking position or the filling position within the sliding grooves 206. A first A second pulley 219 is provided at the end of the rotating sleeve 201 away from the mounting plate 203, along with pulley 218. A first motor 220 and a second motor 221 are installed inside the filling housing 103, both electrically connected to the control module 109. The first motor 220 is connected to the first pulley 218 via a first belt mechanism 222. Starting the first motor 220 drives the first pulley 218 to rotate, which in turn drives the drive plate 204 to rotate, enabling the slider 207 to move between the blocking position and the filling position. The second motor 221 is connected to the second pulley 219 via a second belt mechanism 223. The second belt mechanism 223 transmits power from the second motor 221 to the second pulley 219, which in turn drives the rotating sleeve 201 to rotate, causing the mounting plate 203 and the four sets of filling tubes 202 to rotate synchronously with the outer tube 106 and the inner tube 108 during the foaming process.

[0070] Specifically, the control module 109 coordinates the operation of the first motor 220 and the second motor 221. First, the first motor 220 is started, driving the first pulley 218 to rotate via the first belt mechanism 222. The drive disc 204 rotates accordingly, and the spiral groove 216 pushes the sliding rod 217 to move the slider 207 along the slide groove 206 until the slider 207 reaches the filling position. At this time, the baffle plate 214 passes through the through groove 215 and enters the gap, and the flow channel 238 connects with the filling channel. Next, the second motor 221 is started, driving the second pulley 219 to rotate via the second belt mechanism 223. The rotating bushing 201 rotates accordingly, and the mounting disc 203, drive disc 204, and four sets of filling pipes 202 rotate synchronously, realizing the revolution of the filling component with the outer pipe 106 and the inner pipe 108. When the foaming material enters the outer pipe 106 and the inner pipe 108, the filling component rotates synchronously. When the annulus between pipes 108 is filled, the centrifugal force generated by the rotation of the pipe body and the propulsive force generated by the revolution of the filling component cause the foaming material to spread evenly to every corner of the annulus, avoiding local accumulation or gaps. After entering the foaming reaction stage, the second motor 221 continues to run, and the filling component and the pipe body rotate synchronously. Even if the foaming material undergoes volume changes due to the reaction, the continuous rotation can still ensure that the material is always evenly distributed before curing, and there will be no local shrinkage or loosening due to differences in reaction rate. Compared with the traditional foaming device method of static foaming after filling, this device eliminates the density deviation that may occur during the foaming reaction through the coordinated rotation of revolution and rotation, so that the density of the insulation layer is consistent from the inside to the outside and from one end to the other, improving the overall thermal insulation performance of the pipeline and meeting the thermal insulation requirements of civil heating scenarios.

[0071] Please see as follows Figure 11 and Figure 12As shown, two sets of arc-shaped mounting grooves 224 are provided on one side of the mounting plate 203. The arc shape of the mounting grooves 224 needs to be adapted to the rotation trajectory of the drive plate 204 to ensure that the ratchet 225 can always maintain a snap-fit ​​state with the locking ratchet 229. The ratchet 225 is provided in the mounting groove 224. On one side of the drive plate 204, corresponding to the two sets of ratchet 225, two sets of locking through grooves 226 are provided. The locking through grooves 226 need to correspond to the arc trajectory of the mounting grooves 224. The locking box 227 is slidably provided in the locking through groove 226. The length of the locking through groove 226 needs to meet the sliding requirements of the locking box 227 to ensure that the locking box 227 can drive the locking ratchet 229 to completely disengage from the ratchet 225. One side of the locking box 227 has a... The first sliding groove 228 has a locking ratchet 229 with one end slidably connected to it and the other end engaging with the ratchet rack 225. The first sliding groove 228 is set in a direction perpendicular to the sliding direction of the locking housing 227. The engaging end of the locking ratchet 229 needs to be machined with a tooth shape that matches the teeth of the ratchet rack 225, and the tooth surface needs to be smooth to avoid damaging the teeth of the ratchet rack 225 during engagement. During installation, it is necessary to ensure that the tooth shape of the locking ratchet 229 matches the ratchet rack 225. After the locking ratchet 229 is placed into the first sliding groove 228, the locking housing 227 is pushed close to the ratchet rack 225 to confirm whether the locking ratchet 229 can engage with the teeth of the ratchet rack 225. If there is no looseness after engagement, the locking ratchet 229 and the ratchet rack 225 are properly matched. A locking spring 230 is provided between the bottom of the locking housing 227 and the locking ratchet 229. The locking spring 230 can provide sufficient downward pressure to the locking ratchet 229 to ensure that the locking ratchet 229 engages with the ratchet rack 225, but the spring force is not too large, which would make it difficult for the locking ratchet 229 to disengage from the ratchet rack 225. A fixing seat 231 is provided at the top of the locking housing 227, and an electric telescopic rod 232 is provided between the fixing seat 231 and the drive disk 204. The electric telescopic rod 232 connecting the fixing seat 231 and the drive disk 204 is electrically connected to the control module 109. After the electric telescopic rod 232 is installed, the extension stroke needs to be tested to ensure that it can push the locking housing 227 to move until the locking ratchet 229 is completely disengaged from the ratchet rack 225.

[0072] Specifically, in actual production, when the slider 207 needs to be moved to the filling position for filling, the control module 109 starts the first motor 220. The first motor 220 drives the drive disk 204 to rotate through the first belt mechanism 222. The spiral groove 216 on the drive disk 204 pushes the sliding rod 217 to move the slider 207 along the groove 206. During this process, the locking box 227 moves synchronously with the drive disk 204. Under the elastic force of the locking spring 230, the locking ratchet 229 slides slowly along the teeth of the ratchet rack 225. When the slider 207 reaches the filling position, the locking ratchet 229 is fully engaged with a set of teeth of the ratchet rack 225. At this time, the relative position of the drive disk 204 and the mounting disk 203 is fixed. Even if the second motor 221 drives the rotating bushing 201 to rotate, or the tube body itself rotates and generates vibration and centrifugal force, the four sets of filling tubes 202 can always maintain the filling position. The injection position is fixed and will not deviate, ensuring a stable injection process. When the injection is complete and the slider 207 needs to be switched to the blocking position, the control module 109 sends an extension command to the electric telescopic rod 232. The electric telescopic rod 232 pushes the fixed seat 231 to move the locking box 227 along the locking groove 226. During the movement of the locking box 227, the locking ratchet 229 gradually disengages from the ratchet rack 225. When the ratchet is completely disengaged from the ratchet rack 225, the control module 109 controls the first motor 220 to rotate in the opposite direction, driving the drive disk 204 to rotate in the opposite direction, thereby pushing the slider 207 to move along the slide groove 206 to the blocking position. At this time, the electric telescopic rod 232 resets and retracts, and the locking ratchet 229 resets to wait for the next locking operation. The entire locking and unlocking process does not require manual intervention and can adapt to the continuous rotation and vibration environment in pipeline production, ensuring the working stability of the injection components and ensuring the uniform formation of the insulation layer of the heating pipeline.

[0073] Please see as follows Figure 6 , Figure 7 and Figure 8As shown, a second sliding groove 233 is also provided on the periphery of the filling pipe 202. The second sliding groove 233 is arranged along the axial direction of the filling pipe 202. The sealing plate 234 is slidably connected to the second sliding groove 233. The length of the second sliding groove 233 needs to meet the sliding requirements of the sealing plate 234 to ensure that the sealing plate 234 can adjust its position synchronously when the slider 207 moves. The function of the sealing plate 234 is to seal the filling port 107 on the periphery of the outer pipe 106 at different operation stages to prevent the foaming material from leaking from the filling port 107 or externally. If impurities enter the annulus, during installation, check whether the mating surface of the sealing plate 234 is flat. Use a flatness tester to check the flatness of the mating surface. Align the sealing plate 234 with the second sliding groove 233 and insert it. Then push the sealing plate 234 along the second sliding groove 233 to confirm that it can always slide in a direction parallel to the axis of the filling tube 202. After that, put the outer tube 106 on the outside of the filling tube 202 and observe whether the sealing plate 234 can fit against the outer wall of the outer tube 106. If it fits tightly, the sealing plate 234 is installed successfully. A blocking plate 235 is provided on one side of the sealing plate 234. The size of the blocking plate 235 is larger than the diameter of the filling outlet 212 to ensure that it can completely cover the filling outlet 212 and prevent impurities from entering or material from leaking when blocked. A sealing spring 236 is provided between the mounting plate 203 and the sealing plate 234. The sealing spring 236 should be able to provide sufficient pressure to the sealing plate 234 to ensure that the sealing plate 234 fits tightly against the outer wall of the outer tube 106.

[0074] Specifically, when the slider 207 is in the blocking position, it moves along the slide groove 206 to a position away from the center of the mounting plate 203. Under the action of the closing spring 236, it pushes the sealing plate 234 towards the bottom end of the second slide groove 233. At this time, the sealing plate 235 contacts the filling outlet 212 at the bottom end of the filling pipe 202, thereby sealing the filling outlet 212 and preventing external dust and impurities from entering the filling channel through the filling outlet 212, thus avoiding contamination of the foamed material being transported subsequently. When the slider 207 is in the filling position, it moves along the slide groove 206 to a position close to the center of the mounting plate 203, causing the filling tube 202 to pass through the filling port 107 of the outer tube 106 and extend into the annulus. At this time, the outer wall of the outer tube 106 will generate a reverse thrust on the sealing plate 234, causing the sealing plate 234 to compress the sealing spring 236 and move along the second sliding groove 233. After the sealing plate 235 moves with the sealing plate 234, it no longer blocks the filling outlet 212, and the foaming material can flow from the filling tube. The foaming material is injected into the annulus through the filling outlet 212. Simultaneously, the sealing plate 234, under the elastic force of the sealing spring 236, tightly adheres to the outer wall of the outer tube 106, sealing the filling port 107 around the outer tube 106 to prevent leakage of the foaming material from the filling port 107 to the outside of the outer tube 106. When the foaming material is injected and rotated for foaming, the control module 109 drives the slider 207 to move to the intermediate position between the blocking position and the filling position. At this time, the slider 207 slightly moves the filling tube 202. The sealing plate 235 retracts and, under the elastic force of the sealing spring 236, re-contacts the filling outlet 212, thereby sealing the filling outlet 212 and preventing the foaming material in the annulus from flowing back into the flow channel 238 due to the centrifugal force generated by rotation. At the same time, the sealing plate 234 is still tightly attached to the outer wall of the outer tube 106 under the action of the sealing spring 236, continuing to seal the filling port 107 of the outer tube 106, ensuring that there is no material leakage during the foaming process, until the foaming material is completely cured to form an insulation layer.

[0075] Please see as follows Figure 13 , Figure 14 , Figure 15 and Figure 16As shown, the pipe clamp includes four sets of rotating clamping columns 302 for clamping the outer pipe 106 or the inner pipe 108. A track seat 303 is provided on the top of the foaming platform 102. Parallel linear modules 301 and guide rails 304 are mounted on the track seat 303. The function of the track seat 303 is to provide an installation base for the linear modules 301 and guide rails 304. It is necessary to ensure that the upper surface of the track seat 303 is level to prevent the linear modules 301 and guide rails 304 from becoming non-parallel due to tilting of the track seat 303, which would affect the movement of the sliding plate 305. For precise control, the level of the track seat 303 must be measured with a level before use. If tilting is present, it should be corrected by adjusting the shims at the bottom of the track seat 303. The linear module 301 and guide rail 304 on the track seat 303 must be parallel to each other. The linear module 301 provides the moving power for the sliding plate 305. Its electric slider must be firmly fixed to the bottom of the sliding plate 305 to prevent loosening during sliding. The guide rail 304 restricts the direction of movement of the sliding plate 305 to prevent it from deviating. The bottom of the sliding plate 305 is slidably connected to the guide rail 304 and fixed to the electric slider of the linear module 301. Its function is to drive the entire pipe clamp to move along the track seat 303, thereby pushing the clamped outer tube 106 or inner tube 108 into the rotating sleeve 201 of the filling assembly. The top of the sliding plate 305 is provided with two sets of columns 306 connected to the top plate 307. Two sets of relatively movable blocks 308 are provided between the sliding plate 305 and the top plate 307. Their function is to drive the two sets of rotating clamping columns 302 to move closer or further away, so as to clamp and release the outer tube 106 or the inner tube 108. Each of the two sets of movable blocks 308 has two sets of rotating holes 309 on one side. Each rotating hole 309 contains a bearing 310. One end of each of the four sets of rotating clamping columns 302 passes through the four sets of bearings 310.

[0076] Please see as follows Figure 15 and Figure 16As shown, two sets of guide rods 311 are provided between the sliding plate 305 and the top plate 307. Two sets of moving blocks 308 are slidably connected to the two sets of guide rods 311. The two sets of guide rods 311 need to be perpendicularly connected to the sliding plate 305 and the top plate 307, and the two sets of guide rods 311 need to be kept parallel to each other. Their function is to limit the movement direction of the two sets of moving blocks 308 and prevent the moving blocks 308 from deviating or tilting during movement. A clamping motor 312 is provided on the top of the top plate 307. The main shaft of the clamping motor 312 needs to pass through... The top plate 307 is securely connected to the double-threaded rod 313. The threaded holes on the two sets of moving blocks 308 are respectively connected to the positive and negative thread sections of the double-threaded rod 313. The main shaft of the clamping motor 312 is connected to the double-threaded rod 313 using a coupling to ensure a secure connection. The clamping motor 312 is electrically connected to the control module 109. The control module 109 starts the clamping motor 312 to rotate the double-threaded rod 313, bringing the two sets of moving blocks 308 closer together, allowing the two sets of moving blocks 308 to pass through. Four sets of rotating clamping columns 302 on one side of the 08 clamp the outer tube 106 or the inner tube 108; one set of moving blocks 308 is provided with a mounting frame 314 on one side, and two sets of rotatable sprockets 315 are provided inside the mounting frame 314. One side of each of the two sets of sprockets 315 is connected to one of the rotating clamping columns 302, and the two sets of sprockets 315 are connected to each other by a chain 316. A transfer motor 317 is provided on one side of the mounting frame 314, and the main shaft of the transfer motor 317 needs to be connected to one of the sets of sprockets 315. The shaft is fixedly connected, and the connection method uses a coupling to ensure a firm connection. The transfer motor 317 is electrically connected to the control module 109. When the control module 109 starts the transfer motor 317, it drives the sprocket 315 to rotate, which drives the chain 316 to drive, thereby making the two sets of sprockets 315 rotate synchronously. Since the shaft of the sprocket 315 is connected to two sets of rotating clamping columns 302, it ultimately drives the rotating clamping columns 302 to rotate, providing propulsion force for the clamped outer tube 106 or inner tube 108, so that it can be smoothly inserted into the filling assembly.

[0077] For example, during the installation of heating pipes, the worker first drives the moving block 308 via the clamping motor 312, causing the four sets of rotating clamping columns 302 to fit tightly against the outer wall of the outer pipe 106. After confirming a secure clamping, the worker starts the transfer motor 317 via the control module 109. The main shaft of the transfer motor 317 drives one set of sprockets 315 to rotate, and the chain 316 drives another set of sprockets 315 to rotate synchronously, thereby causing the two sets of rotating clamping columns 302 to rotate. The rotating clamping columns generate a pushing force on the outer pipe 106. At the same time, the linear module 301 is controlled to drive the sliding plate 305 to move along the guide rail 304. The two work together to push the outer pipe 106 slowly through the assembly hole 105 of the filling housing 103 until the middle of the outer pipe 106 enters the rotating bushing 201 of the filling component. During this process, the worker observes... The outer tube 106 is inserted in a state that is confirmed to be free from deviation or jamming. Once inserted into place, the transfer motor 317 and the linear module 301 are stopped, completing the insertion of the outer tube 106. When inserting the inner tube 108, the above process is repeated. The transfer motor 317 drives the rotating clamping column 302 to rotate, and in conjunction with the movement of the linear module 301, the inner tube 108 is smoothly inserted into the outer tube 106, ensuring that the inner tube 108 and the outer tube 106 are coaxial. This provides a stable tube body foundation for subsequent injection and foaming. Throughout the process, the guide rod 311 ensures the smooth movement of the moving block 308, the double threaded rod 313 achieves uniform clamping, the sprocket 315 and the chain 316 transmit stable power, and the transfer motor 317 provides propulsion force, ensuring the stability and coaxiality of the civil heating pipe body insertion.

[0078] Please see as follows Figure 15 , Figure 16 and Figure 17As shown, one set of columns 306 has two sets of rotating seats 318 on one side. The two sets of rotating seats 318 are coaxially distributed, and a closed frame 319 is rotatably mounted between the two sets of rotating seats 318, located in a closed position or a clearance position. The two sets of rotating seats 318 provide rotational support for the closed frame 319, ensuring that the closed frame 319 can smoothly switch to the closed position or the clearance position around the rotating seats 318. A switching motor 328 is installed on the top of the top plate 307. The switching motor 328 is fixed to a preset position on the top plate 307 by bolts. The main shaft of the switching motor 328 is connected to the rotation shaft of the closed frame 319 by a coupling, ensuring that the switching motor 328 can drive the closed frame 319 to rotate synchronously when it is running. 8 is electrically connected to the control module 109. Before use, the rotation direction of the switching motor 328 needs to be tested to ensure that the switching motor 328 can drive the closed frame 319 to accurately switch to the closed position or the avoidance position. Two sets of rotating clamps 320 are provided on one side of the closed frame 319. The two sets of rotating clamps 320 are symmetrically distributed on one side of the closed frame 319. A rotating ring 321 is rotatably arranged between the two sets of rotating clamps 320. The function of the two sets of rotating clamps 320 is to provide rotational support for the rotating ring 321, ensuring that the rotating ring 321 can rotate between the two sets of rotating clamps 320. The side of the rotating ring 321 away from the closed frame 319 is connected to a blocking plate 322 through multiple sets of connecting rods. A sealing layer is fixed on one side of the blocking plate 322. 323, the gap between the sealing layer 323 and the outer tube 106 and inner tube 108 is matched to ensure that the gap can be filled to form a seal; the plugging plate 322 and the sealing frame 319 have an inner tube through hole 324 on one side. The inner tube through hole 324 on the plugging plate 322 and the sealing frame 319 are coaxial. The inner tube through hole 324 is used to provide a passage for the inner tube 108 to ensure that the inner tube 108 is coaxial with the outer tube 106 after it is inserted, so as to avoid the tube body being eccentric due to the end sealing structure. At the same time, the inner tube through hole 324 needs to match the diameter of the inner tube 108 to avoid the inner tube through hole 324 being too large, resulting in poor sealing, or too small, hindering the insertion of the inner tube 108; two sets of limiting blocks 325 are provided on one side of the sealing frame 319. Two sets of limiting blocks 325 are used to limit the rotation angle of the closed frame 319 to prevent the closed frame 319 from rotating too far, causing the blocking plate 322 to fail to accurately fit the end of the outer tube 106. Before use, the position of the limiting blocks 325 needs to be adjusted according to the preset angle of the closed position and the avoidance position. After adjustment, they are fixed with bolts to ensure that the closed frame 319 can be blocked by the limiting blocks 325 when it rotates to the corresponding position. A rotating gear 326 is provided on one side of the blocking plate 322. The rotating gear 326 is coaxial with the blocking plate 322. A rotating motor 327 is provided on one side of the closed frame 319. The main shaft of the rotating motor 327 is equipped with gears that mesh with the rotating gear 326 without excessive clearance. The rotating motor 327 is electrically connected to the control module 109.

[0079] Specifically, when the closed frame 319 is in the clearance position, the blocking plate 322 and the closed frame 319 do not coincide with the rotation axis of the inner tube 108 and the outer tube 106; when the closed frame 319 is in the closed position, the sealing layer 323 seals the opening at the end of the outer tube 106, and the blocking plate 322 and the closed frame 319 are both located on the rotation axis of the inner tube 108 and the outer tube 106, with the inner tube 108 passing through the inner tube through hole 324. The control module 109 starts the switching motor 328, which drives the closed frame 319 to rotate around the rotating seat 318 until the closed frame 319 is blocked by the limit block 325. At this time, the closed frame 319 is in the closed position, the blocking plate 322 is attached to the end of the outer tube 106, and the sealing layer 323 fills the gap between the outer tube 106 and the inner tube 108 to form a reliable seal. Before starting the polyurethane foam extruder to convey materials, the control module 109 starts the rotating motor 327. The gear of the main shaft of the rotating motor 327 drives the rotating gear 326 to rotate, which in turn drives the blocking plate 322 and the rotating ring 321 to rotate synchronously. The rotation direction of the blocking plate 322 is consistent with the rotation direction of the outer tube 106 and the inner tube 108, and the speed is kept synchronized to ensure that the foaming material does not accumulate at the end during the injection and reaction process. When the foaming material is added and the foaming reaction stage is entered, the rotating motor 327 continues to run, driving the blocking plate 322 continues to rotate, and the sealing layer 323 always maintains a seal on the gap to prevent material leakage from the end. At the same time, the rotating plug plate 322 ensures that the foaming material at the end maintains the same flow speed and reaction rhythm as the middle, preventing looseness or gaps at the end. After foaming is completed, the linear module 301 pulls the pipe clamp, sealing layer 323 and plug plate 322 away from the outer pipe 106, so that the inner pipe 108 is no longer inserted into the inner pipe perforation 324. At this time, the control module 109 starts the switching motor 328, which drives the closed frame 319 to rotate to the avoidance position. Then, the formed composite pipe is pulled out by the pipe traction machine. Throughout the process, the position switching of the closed frame 319 and the sealing and rotation of the plug plate 322 are stable and reliable, ensuring the forming quality of the insulation layer at the end of the civil heating pipe, making the density and structural integrity of the insulation layer at both ends consistent with the middle, and improving the overall thermal insulation performance of the pipe.

[0080] The specific usage and function of this embodiment: When using the device, the outer shell 101 is installed in the workshop, and the foaming platform 102 is checked to ensure that it remains horizontal to provide a horizontal working surface for subsequent processes, preventing the pipe from shifting or the foaming material from being unevenly distributed. The inner tube 108 and outer tube 106 are hoisted to the two sets of pipe clamps respectively. The clamping motor 312 on the top of the top plate 307 is started. The main shaft of the clamping motor 312 drives the double threaded rod 313 to rotate. Under the restriction of the guide rod 311, the two sets of moving blocks 308 move relative to each other along the positive thread section and the reverse thread section of the double threaded rod 313, thereby driving the four sets of rotating clamping columns 302 to approach the inner tube 108 or the outer tube 106. The linear module 301 is started. Its electric slider drives the sliding plate 305 to move along the guide rail 304 towards the filling shell 103. At the same time, the transfer motor 317 on one side of one set of moving blocks 308 is started. The main shaft of the transfer motor 317 drives a set of sprockets 315 to rotate. The chain 316 drives another set of sprockets 315 to rotate synchronously, thereby driving the two sets of rotating clamping columns 302 to rotate, providing a smooth propulsion force for the inner tube 108 or the outer tube 106. During this process, the guide rail 304 restricts the movement direction of the sliding plate 305, ensuring that the inner tube 108 and the outer tube 106 are sequentially inserted into the assembly holes 105 on both sides of the filling housing 103, and finally fitted into the rotating bushing 201 of the filling assembly, while the inner tube 108 and the outer tube 106 remain coaxial. The switching motor 328 at the top of the top plate 307 is started. The main shaft of the switching motor 328 drives the closed frame 319 to rotate around the rotating seat 318 until the frame is blocked by the limit block 325. At this time, the closed frame 319 is in the closed position. The plugging plate 322 on the other side of the closed frame 319 is attached to the end of the outer tube 106. The sealing layer 323 on one side fills the gap between the outer tube 106 and the inner tube 108 to form a reliable seal and prevent material leakage from the end during injection. The inner tube 108 passes through the inner tube through hole 324 of the plugging plate 322 and the closed frame 319 to ensure that the inner tube 108 and the outer tube 106 are always coaxial and avoid uneven annular space gap due to end closure.

[0081] Next, the first motor 220 inside the filling housing 103 is started. The first motor 220 drives the first pulley 218 to rotate through the first belt mechanism 222, which in turn drives the drive disk 204 to rotate. The spiral groove 216 on one side of the drive disk 204 pushes the sliding rod 217 on one side of the slider 207, causing the slider 207 to move from the blocking position to the filling position along the sliding groove 206 of the mounting disk 203. At this time, the bottom ends of the four sets of filling tubes 202 pass through the sliding hole 208, the gap between the mounting bushing 205 and the rotating bushing 201, and finally pass through the outer tube 106, communicating with the annular space between the inner tube 108 and the outer tube 106. Meanwhile, the locking ratchet 229 on one side of the mounting plate 203 engages with the ratchet rack 225 under the action of the locking spring 230, fixing the relative angle between the mounting plate 203 and the drive plate 204, ensuring that the filling tube 202 does not shift due to tube vibration or centrifugal force during the filling process; if it is necessary to adjust the position of the filling tube 202, the electric telescopic rod 232 is activated by the control module 109 to push the locking box 227 to separate the locking ratchet 229 from the ratchet rack 225, and the drive plate 204 can be rotated in the opposite direction.

[0082] Then, the foaming material can be conveyed and injected circumferentially: the polyurethane foaming extruder is started, and its discharge end is connected to the threaded interface pipe head 211 on the outside of the sealing ring 209 through the pipeline. The foaming material enters the flow cavity 210 formed by the mounting plate 203 and the two sets of sealing rings 209 through the threaded interface pipe head 211. At this time, the slider 207 is in the injection position, the baffle plate 214 passes through the through groove 215 and enters the gap, and the flow channel 238 is connected to the injection pipe 202 and the injection channel in the slider 207. The foaming material is injected into the annular space from the injection outlet 212 through the flow channel 238 and the injection channel. The sealing plate 234 around the filling pipe 202, under the action of the sealing spring 236, is tightly attached to the outer wall of the outer pipe 106, sealing the filling port 107 of the outer pipe 106 to prevent material leakage. The discharge check valve 213 in the filling outlet 212 restricts the material to flow only from the filling channel to the annulus, preventing the material from flowing back into the flow channel 238 and causing blockage due to pipe rotation or pressure fluctuations. In addition, the sealing ring 237 between the mounting plate 203 and the sealing ring 209 ensures that the flow cavity 210 is sealed, while the mounting plate 203 can rotate relative to the sealing ring 209. The second motor 221 is started, which drives the second pulley 219 to rotate via the second belt mechanism 223, thereby driving the rotating bushing 201 to rotate. The mounting plate 203, the drive plate 204, and the four sets of filling pipes 202 revolve synchronously with the outer pipe 106 and the inner pipe 108, ensuring that the filling pipe 202 is relatively stationary with the pipe body and avoiding local accumulation of material. At the same time, the rotating motor 327 on one side of the closed frame 319 is started. The gear on the main shaft of the rotating motor 327 drives the rotating gear 326 on one side of the blocking plate 322 to rotate, thereby driving the blocking plate 322 and the rotating ring 321 to rotate synchronously, driving the inner pipe 108 and the outer pipe 106 to rotate along their own axes. The centrifugal force generated by the rotation of the pipe body causes the foaming material in the annular space to spread evenly to all corners and fill the gaps. The revolution is coordinated with the injection direction, so that the material is filled synchronously from all sides of the annular space, avoiding the problem of high bottom density and loose top caused by single-sided injection in traditional foaming devices. During the foaming process, once the foaming material has been injected, the control module 109 drives the slider 207 to move between the blocking position and the filling position. The sealing plate 235 closes the filling outlet 212 under the action of the sealing spring 236, and the sealing plate 234 continues to seal the filling outlet 107 to ensure that the material is stably cured during rotation and forms a heat insulation layer with consistent density.

[0083] After the foaming time reaches the set value, the polyurethane foam extruder and the second motor 221 are shut down, stopping the injection and rotation. The linear module 301 pulls the pipe clamp, sealing layer 323, and blocking plate 322 away from the outer pipe 106, so that the inner pipe 108 is no longer inserted into the inner pipe perforation 324, releasing the seal at the end of the outer pipe 106. The switching motor 328 is started to switch the closed frame 319 to the clearance position. The control module 109 adjusts the first motor 220 to rotate the drive disk 204 in the opposite direction, causing the slider 207 to return to the blocking position, and the injection pipe 202 to exit the outer pipe 106, completing the component reset. Then, the formed insulation pipe is pulled out from the injection shell 103 by an external pipe traction machine and transported to the collection area. Throughout the process, the control module 109 coordinates the operating rhythm of each component to ensure the connection of processes such as pipe clamping, insertion, injection, foaming, and traction, ultimately producing polyurethane insulation pipes with uniform insulation layer and stable thermal insulation performance to meet the long-term insulation needs of various pipelines.

[0084] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A polyurethane foam insulation pipe insulation layer foaming device, characterized in that, include: The equipment casing has a foaming platform on top, an injection casing on top of the foaming platform, an injection cavity inside the injection casing, and assembly holes communicating with the injection cavity on both sides of the injection casing. The filling assembly is installed in the injection chamber and is used to fill the outer tube with foaming material in the circumference. The filling assembly includes a rotating bushing sleeved on the outer tube and four sets of filling tubes, which are respectively inserted into four sets of filling ports on the circumference of the outer tube. Two sets of pipe clamps are installed on both sides of the filling assembly. The pipe clamps are installed on the top of the foaming platform through a linear module. The pipe clamps are used to sequentially insert the outer pipe and inner pipe into the filling assembly and rotate the outer pipe and inner pipe during the foaming process. The control module, mounted on the equipment housing, is used to control the operation of the device. The filling assembly includes a mounting plate and a drive plate. A mounting sleeve is provided at one end of the rotating sleeve. The mounting plate is installed between the mounting sleeve and the rotating sleeve by multiple sets of screws. The drive plate is rotatably sleeved on the rotating sleeve. The mounting plate, the drive plate and the rotating sleeve are located on the same axis. The mounting plate has four sets of through grooves on one side, which are radially distributed. Each of the four filling tubes has a slider at one end. The sliders are located at the filling position or the blocking position of the four grooves respectively. There is a gap between the mounting sleeve and the rotating sleeve. Each of the four grooves has a sliding hole at the bottom that communicates with the gap. When the slider is in the blocking position, the bottom ends of the four sets of filling tubes pass through the four sets of sliding holes and are installed in the gap. When the slider is in the filling position, the bottom ends of the four sets of filling tubes pass through the four sets of sliding holes and gaps and are installed inside the outer tube.

2. The polyurethane foam insulation pipe insulation layer foaming device according to claim 1, characterized in that: Two sets of sealing rings are provided around the mounting plate. A groove is opened between the mounting plate and the two sets of sealing rings to form a flow cavity. A threaded interface pipe head is provided on the outside of one set of sealing rings. The threaded interface pipe head is connected to the discharge end of the polyurethane foam extruder through a pipeline. A sealing ring is provided between the two sets of sealing rings and the mounting plate. The four sets of chutes have a flow channel on one side that communicates with the flow cavity. The filling pipe and the slider have a filling channel that communicates with each other. The bottom of the filling pipe has a filling outlet that communicates with the filling channel. The filling outlet is equipped with a discharge check valve. The slider has a baffle plate on one side and a through groove at the bottom of the slider corresponding to the baffle plate. When the slider is in the blocking position, one side of the blocking plate is in contact with the flow channel in the chute, and the flow channel is not connected to the filling channel. When the slider is in the filling position, the baffle plate passes through the through groove and is installed in the gap, and the flow channel is connected to the filling channel to make connection.

3. The polyurethane foam insulation pipe insulation layer foaming device according to claim 1, characterized in that: The drive disk has four sets of spiral grooves on one side corresponding to four sets of sliding grooves. A sliding rod is provided on one side of the slider, and the sliding rod is slidably connected to the spiral groove. A first pulley is provided on the periphery of the drive disk. A second pulley is provided at the end of the rotating bushing away from the mounting disk. A first motor and a second motor are provided inside the filling housing. Both the first motor and the second motor are electrically connected to the control module. The first motor is connected to the first pulley via the first belt mechanism and is used to rotate the drive disc to move the slider between the blocking position and the filling position. The second motor is connected to the second pulley via the second belt mechanism and is used to rotate the rotating bushing so that the mounting plate and the four sets of filling pipes can rotate along with the outer and inner pipes during the foaming process.

4. The polyurethane foam insulation pipe insulation layer foaming device according to claim 3, characterized in that: Two sets of arc-shaped mounting slots are provided on one side of the mounting plate. A ratchet is provided in each of the two sets of mounting slots. A locking through slot is provided on one side of the drive plate corresponding to the two sets of ratchet. A locking box is slidably installed in the locking through slot. A first sliding groove is provided on one side of the locking box. One end of the locking ratchet is slidably connected to the first sliding groove, and the other end is engaged with the ratchet. A locking spring is provided between the bottom of the locking box and the locking ratchet. A fixing seat is provided at the top of the locking box, and an electric telescopic rod is provided between the fixing seat and the drive plate.

5. The polyurethane foam insulation pipe insulation layer foaming device according to claim 3, characterized in that: A second sliding groove is also provided around the filling pipe. The sealing plate is slidably connected to the second sliding groove. A sealing plate is provided on one side of the sealing plate. A sealing spring is provided between the mounting plate and the sealing plate. When the slider is in the blocking position, the sealing plate seals the filling outlet; When the slider is in the filling position, the sealing plate does not block the filling outlet, and the sealing plate seals the filling outlet on the periphery of the outer pipe; When the foaming material is added and rotated for foaming, the slider is located between the blocking position and the filling position. The sealing plate seals the filling outlet, and at the same time, the sealing plate continues to seal the filling port on the periphery of the outer tube to complete the foaming.

6. The polyurethane foam insulation pipe insulation layer foaming device according to claim 1, characterized in that: The pipe clamp includes four sets of rotating clamping columns for clamping the outer or inner pipe. The top of the foaming platform is equipped with a track seat, on which parallel linear modules and guide rails are installed. The bottom of the sliding plate is slidably connected to the guide rails and fixedly connected to the electric slider of the linear modules. The top of the sliding plate is equipped with two sets of columns connected to the top plate. There are two sets of relatively movable blocks between the sliding plate and the top plate. Each set of movable blocks has two sets of rotating holes on one side, and each rotating hole contains a bearing. One end of each of the four sets of rotating clamping columns passes through the four sets of bearings.

7. The polyurethane foam insulation pipe insulation layer foaming device according to claim 6, characterized in that: Two sets of guide rods are provided between the sliding plate and the top plate. Two sets of moving blocks are slidably connected to the two sets of guide rods. A clamping motor is provided on the top of the top plate. The main shaft of the clamping motor passes through the top plate and is connected to a double threaded rod. The threaded holes on the two sets of moving blocks are respectively connected to the positive thread section and the reverse thread section of the double threaded rod. One side of one set of moving blocks is equipped with an installation frame, and two sets of rotatable sprockets are installed inside the installation frame. The two sets of sprockets are connected by a chain. A transfer motor is installed on one side of the installation frame. The main shaft of the transfer motor is connected to one of the sets of sprockets and is used to insert the clamped outer tube or inner tube into the filling assembly.

8. The polyurethane foam insulation pipe insulation layer foaming device according to claim 6, characterized in that: One set of columns has two sets of rotating seats on one side, and a closed frame located in a closed or avoidance position is rotatably set between the two sets of rotating seats. A switching motor is set on the top of the top plate, and the main shaft of the switching motor is connected to the closed frame. Two sets of rotating clamps are set on the other side of the closed frame, and a rotating ring is rotatably set between the two sets of rotating clamps. A blocking plate is connected to the side of the rotating ring away from the closed frame through multiple sets of connecting rods. A sealing layer is set between the outer tube and the inner tube on one side of the blocking plate. The inner tube is perforated on the blocking plate and the side of the closed frame. Two sets of limit blocks are set on one side of the closed frame. A rotating gear is set on one side of the blocking plate. A rotating motor is set on one side of the closed frame. The main shaft of the rotating motor is equipped with gears that mesh with the rotating gears. When the closed frame is in the clearance position, the blocking plate and the closed frame do not coincide with the rotation axis of the inner tube and the outer tube; When the closed frame is in the closed position, the sealing layer seals the opening at the end of the outer tube. The plugging plate and the closed frame are both located on the rotation axis of the inner tube and the outer tube, and the inner tube is inserted into the inner tube perforation.

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