A 3D printing device and method for thermoplastic protective layer in building pipelines

Abstract

The present invention discloses a device and method for 3D printing a thermoplastic protective layer inside a building pipe, comprising a moving mechanism comprising a plurality of scissor-type adjustment devices arranged in a star shape, a moving roller mounted on the scissor-type adjustment devices, and a regulator for adjusting the scissor-type adjustment devices, wherein a 3D printing mechanism is mounted on the moving mechanism. The present invention relates to the field of building 3D printing technology. By integrating pipe pretreatment, active cooling, and efficient printing functions, the present invention proposes an environmentally friendly and highly stable solution to the problems of insufficient cleaning, temperature control defects, and low construction efficiency of existing pipe inner wall 3D printing technology. The coaxial cleaning-cooling-printing integrated design overcomes the functional limitations of existing pipe inner wall 3D printing equipment, significantly improving the operating stability of the equipment in narrow and complex environments and the quality of the finished product while ensuring environmentally friendly construction, saving polymer materials for the pipe inner wall, and reducing energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of building 3D printing, and in particular to a device and method for 3D printing of a thermoplastic protective layer in a building pipeline. Background Art

[0002] Traditional construction methods rely on a large amount of formwork construction, concrete pouring and manual operations, which not only leads to excessive consumption of materials such as wood and steel, but also increases the environmental burden due to problems such as construction dust and wastewater discharge. 3D printing technology, through digital modeling and additive manufacturing, achieves precise on-demand distribution of materials, significantly reducing waste. Therefore, the application of 3D printing technology in the field of construction is gradually becoming the core driving force for promoting the green transformation of the industry.

[0003] For example, in the "Project Milestone" project in the Netherlands, the material utilization rate of 3D-printed houses is about 40% higher than that of traditional processes, and the construction period is shortened by more than 50%. 3D printing technology can optimize complex structural designs, such as curved walls or special-shaped components, reduce mold requirements, and further reduce resource consumption.

[0004] In the subdivided scenarios of construction, 3D printing technology for pipe inner walls has shown unique application potential. The repair and reinforcement of the inner walls of underground pipeline corridors, oil and gas pipelines and building drainage systems have long relied on manual operations or traditional prefabricated parts, and have problems such as difficult construction, long cycles and insufficient precision. Direct molding inside the pipes through 3D printing equipment can achieve efficient construction of customized structures. For example, printing lining layers with anti-corrosion, wear-resistant or diversion functions can significantly improve the service life and operating efficiency of the pipes. With the advancement of smart cities and underground space development, the market demand for 3D printing of pipe inner walls will continue to grow.

[0005] Therefore, at this stage, 3D printing equipment developed based on construction equipment inside pipelines has also emerged, but this technology still has significant shortcomings. Taking the patent number CN109624317B as an example, it discloses a 3D printing device inside a pipeline, which completes component molding by moving the print head, but the technical solution does not integrate the pipeline cleaning function and the nozzle cooling system. In actual applications, the inner wall of the pipeline is often attached with oil or particulate impurities. If not pre-treated, the bonding strength between the printing material and the substrate will be greatly reduced, resulting in component falling off or substandard performance. At the same time, the pipeline length is usually long, and the nozzle is prone to overheating due to the continuous output of high-temperature materials (such as thermoplastic polymers) during continuous printing, which may cause material carbonization or equipment failure. This patent only relies on passive heat dissipation and cannot meet the needs of long-term operations. There is a risk of construction interruption, which directly affects the operation efficiency and product quality.

[0006] Therefore, there is an urgent need for an environmentally friendly 3D printing device that integrates pipeline pretreatment, active nozzle cooling and intelligent monitoring functions. This is the key to breaking through the existing technical bottleneck. By optimizing the cleaning and temperature control links in the printing process, the construction accuracy and equipment stability of 3D printing of the inner wall of the pipeline can be improved, and the technology can be promoted to develop in the direction of scale and efficiency, realizing green and intelligent upgrades in the field of construction. Summary of the Invention

[0007] In response to the deficiencies of the prior art, the present invention provides a device and method for 3D printing of thermoplastic protective layers in building pipes, which solves the problems of the existing background technology.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a 3D printing device for a thermoplastic protective layer in a building pipe, comprising a moving mechanism, the moving mechanism comprising a plurality of scissor-type adjustment devices arranged in a star shape, moving rollers mounted on the scissor-type adjustment devices, and an adjuster for adjusting the scissor-type adjustment devices, wherein a 3D printing mechanism is mounted on the moving mechanism;

[0009] The 3D printing mechanism includes a printing inlet pipe, one side of which is connected to a 3D printer head, and the upper part of the 3D printer head is connected to a cooling circulator, which provides cooling water for the 3D printer head;

[0010] The cooling circulator is provided with a coaxial power adjustment structure, which drives the 3D printer head to rotate through the cooling circulating water. The coaxial power adjustment structure is provided with a coaxial cleaner, which rotates synchronously with the 3D printer head.

[0011] The coaxial cleaner, coaxial power adjustment structure and 3D printer head are all located on the same axis;

[0012] The 3D printer head includes a material diverter seat, which is arranged on one side of the moving mechanism and connected to the printing inlet pipe. The material diverter seat is provided with at least one pair of printing nozzles, and the ends of the printing nozzles are connected to the printing nozzles.

[0013] The coaxial power adjustment structure includes a support sleeve, which is sleeved on the head end of the moving mechanism. A driving turbine is provided inside the support sleeve. The cooling circulator passes through the central axis of the regulator and corresponds to the driving turbine in the support sleeve. The cooling circulating water of the cooling circulator impacts the driving turbine to rotate the driving turbine. One end of the driving turbine is connected to an output shaft, and the output shaft is connected to the material diverter seat.

[0014] The shaft end of the output shaft passes through the material diverter seat and is connected with the coaxial cleaner.

[0015] The adjuster includes a supporting main rod, which is a rod with a columnar structure and one end of which is an external thread structure. A positioning thread seat is threadedly connected to the supporting main rod, and the positioning thread seat is connected to the scissor-type adjustment device.

[0016] A travel motor is provided on one side of the moving roller, and the travel motor drives the moving roller to rotate.

[0017] The scissor-type adjustment device includes a first support rod installed on the side of the support sleeve, a second support rod connected to the first support rod in a scissor-like manner, the end of the second support rod is movably connected to the positioning threaded seat, and the outer ends of the second support rod and the first support rod are respectively provided with movable rollers.

[0018] The cooling circulator includes an outer tube, an inner tube and a shunt cold channel. The inner tube is connected to the inner cavity of the supporting main rod. The inner tube is coaxially arranged in the outer tube. The inner tube is connected to the supporting sleeve to drive the driving turbine to rotate. Several shunt cold channels are arranged on the upper ring of the supporting sleeve. The printing nozzle and the outer ring of the printing nozzle are provided with cooling tubes.

[0019] The material diversion seat consists of a mounting plate connected to the support sleeve, and a movable seat nested with the mounting plate. The mounting plate is provided with a feed port connected to the printing inlet pipe. The printing nozzle extends radially from the movable seat. The printing nozzle is connected to the inner cavity of the movable seat. A sealing slip ring is provided between the movable seat and the mounting plate.

[0020] The coaxial cleaner and the coaxial power adjustment structure are linked through bearing drag reduction. The coaxial cleaner includes a cleaning shaft seat, which is connected to the end of the output shaft. A number of cleaning support rods are provided on the cleaning shaft seat, and a number of cleaning wiping blocks are provided at the ends of the cleaning support rods. The cleaning support rods are telescopic rod structures.

[0021] The cooling circulator also includes a circulation return pipe, which is connected to the cooling pipe. The cooling pipe is connected to the annulus between the outer pipe and the inner pipe through the circulation return pipe. A return ring is provided on the outside of the outer pipe. The return ring is connected to the annulus between the outer pipe and the inner pipe, and the return ring is movably connected to the outer pipe. Cooling water enters the annulus between the outer pipe and the inner pipe through the circulation return pipe for reflux.

[0022] The outer tube is provided with a plurality of through grooves, and a pair of ring plates are provided on both sides of the through grooves. The return ring sleeve is provided on the pair of ring plates. The return ring sleeve is a plate with an annular structure. The return ring sleeve is integrally provided with an interface for connecting with the circulation return pipe, and the pair of ring plates are sealed and connected to the return ring sleeve.

[0023] A method for using a 3D printing device for a thermoplastic protective layer in a building pipeline comprises the following steps:

[0024] Step 1. Equipment positioning and leveling: Move the equipment to the predetermined construction location, start the travel motor to drive the moving rollers to initially position the equipment, rotate the positioning threaded seat to change its relative position with the supporting main rod. Since the positioning threaded seat is connected to the scissor-type adjustment device, this action will drive the scissor-type mechanism to extend and retract, so that the scissor-type adjustment devices in multiple directions of the equipment are in contact with the inner wall of the pipeline, ensuring that the equipment is placed firmly and horizontally on the pipeline working surface;

[0025] Step 2: Loading printing materials: Connect the environmentally friendly printing slurry used in the building pipeline to the printing inlet pipe through the feeding system. The slurry flows into the feed port of the material diverter seat through the printing inlet pipe, filling its inner cavity and preparing for printing;

[0026] Step 3: Pre-adjust the coaxial cleaner: Manually adjust the length of the cleaning rod on the coaxial cleaner according to the cleaning requirements of the printed component so that the cleaning wipe block is in the appropriate radial position;

[0027] Step 4: Cooling system connection: connect the external water source or coolant supply pipeline to the inlet and outlet of the cooling circulator. The inlet is the end of the inner tube coaxially arranged at the end of the moving device, and the outlet is connected to the annulus of the inner tube and the outer tube.

[0028] Step 5: Printing in the pipe: Start the feeding system and press the printing slurry into the material diversion seat through the printing inlet pipe. The slurry is diverted to the printing nozzles arranged on the movable seat and finally extruded from the printing nozzle. The cooling water circulation is started simultaneously. Driven by pressure, the cooling water flows out of the inner pipe at high speed, impacting the driving turbine in the support sleeve, driving the turbine to rotate, driving the output shaft connected to it to rotate. The output shaft synchronously drives two key components:

[0029] Step 5.1. Movement of the material diverter seat: The output shaft causes the entire annularly distributed printing nozzle and printing head to revolve around the central axis of the equipment, realizing the extrusion trajectory of the printing head;

[0030] Step 5.2, the coaxial cleaner's activities: the cleaning shaft seat, cleaning rod and cleaning wiper rotate synchronously with the output shaft, automatically cleaning the residual material splashed or accumulated near the print head, keeping the printing area clean;

[0031] Step 6. Printing process monitoring and adjustment: Monitor the extrusion state and molding quality of the printing slurry, observe whether the cooling water circulation is normal, ensure that the 3D printer head is effectively cooled to prevent overheating, and indirectly adjust the speed of the drive turbine by controlling the flow and pressure of the cooling water, thereby controlling the rotation speed of the print head and cleaner;

[0032] Step 7, cooling water circulation and recovery: After the cooling water impacts the driven turbine to do work, it flows into the bypass cooling channel arranged on the support sleeve. The bypass cooling channel guides the cooling water to the printing nozzle and the cooling pipe arranged outside the printing nozzle to directly cool the high-temperature printing nozzle. The cooling water after absorbing heat is collected from the cooling pipe to the circulation return pipe. The circulation return pipe transports the hot water / hot coolant back to the return annulus. The hot water / hot coolant enters the annulus between the outer pipe and the inner pipe through the return annulus, and flows back along this annulus to the equipment inlet or the external recovery / cooling device, completing a cycle.

[0033] Step 8. Printing end and cleaning: Stop the feeding system, interrupt the printing slurry supply, keep the cooling water circulating for a while, and continue to cool the print head until the temperature drops to a safe range, then stop the cooling water circulation;

[0034] Step 9. Equipment folding and moving: Operate the adjuster, reversely rotate the supporting main rod or positioning threaded seat to retract the scissor-type adjustment device and lower the height of the equipment to a state that is easy to move.

[0035] Beneficial effects: The present invention provides a device and method for 3D printing of thermoplastic protective layers inside building pipes. By integrating pipe pretreatment, active cooling and efficient printing functions, it proposes an environmentally friendly and highly stable solution to the problems of insufficient cleaning, temperature control defects and low construction efficiency of existing 3D printing technology for pipe inner walls. Through the coaxial cleaning-cooling-printing integrated design, it breaks through the functional limitations of existing 3D printing equipment for pipe inner walls. While ensuring environmentally friendly construction, saving polymer materials for the inner wall of the pipe and reducing energy consumption, it significantly improves the operating stability of the equipment in narrow and complex environments and the quality of the finished product. It also has the following technical effects.

[0036] 1. The coaxial cleaner works in conjunction with the print head to solve the problem of low bonding strength to the inner wall of the pipe. The coaxial cleaner and the coaxial power adjustment structure are linked through bearing drag reduction and rotate synchronously with the 3D print head. During the printing process, the cleaner scrapes off oil stains and particulate impurities on the inner wall of the pipe in real time, ensuring direct contact between the thermoplastic material and the substrate, avoiding interlayer delamination or substandard performance caused by attachments.

[0037] 2. The cooling circulator is coupled with the power regulation structure to solve the problems of nozzle overheating and material carbonization. The cooling circulator provides circulating cooling water to the print head through the inner tube and the diverter cooling channel. At the same time, it uses the impact of water flow to drive the turbine, converting the cooling power into the rotational driving force of the print head, achieving "one water for two purposes". It not only prevents the thermoplastic material from causing the nozzle operating temperature to be too high through active cooling, causing the thermoplastic material to carbonize during pipeline printing, but also reduces additional energy consumption by replacing the traditional motor through hydraulic drive. While reducing energy consumption, it also extends the working time of the nozzle.

[0038] 3. The multi-nozzle annular layout optimizes printing efficiency and material utilization. The material diversion ring is equipped with no less than a pair of printing nozzles. Combined with the rotation function of the print head, 360° printing of the annular lining can be completed in a single pass, which greatly improves material utilization, printing efficiency and speed, and significantly shortens the construction period.

[0039] 4. The star-shaped scissor-type moving mechanism improves the adaptability of the equipment in complex pipelines. The regulator cooperates with the positioning thread seat through the external thread structure of the supporting main rod to dynamically adjust the expansion angle of the scissor-type adjusting device. The star-shaped arranged moving rollers can adapt to changes in various pipe diameters and are easy to control. Compared with traditional linear moving mechanisms, the passability in various pipelines is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a first structural schematic diagram of a 3D printing device for a thermoplastic protective layer inside a building pipe according to the present invention.

[0041] Figure 2 This is a schematic diagram of the top view of the structure of a 3D printing device for a thermoplastic protective layer inside a building pipe according to the present invention.

[0042] Figure 3 This is a second structural schematic diagram of a 3D printing device for a thermoplastic protective layer inside a building pipe according to the present invention.

[0043] Figure 4 This is a schematic diagram of the three-dimensional structure of the moving mechanism of the 3D printing device for thermoplastic protective layer in building pipes described in the present invention.

[0044] Figure 5 This is a schematic cross-sectional view of a 3D printing device for a thermoplastic protective layer inside a building pipe according to the present invention.

[0045] Figure 6 This is a first stereoscopic structural diagram of the 3D printing mechanism of a 3D printing device for a thermoplastic protective layer inside a building pipe according to the present invention.

[0046] Figure 7 This is a second three-dimensional structural schematic diagram of the 3D printing mechanism of the 3D printing device for thermoplastic protective layer inside building pipes described in the present invention.

[0047] Figure 8 This is a schematic diagram of the blasting structure of a 3D printing device for a thermoplastic protective layer inside a building pipeline as described in the present invention.

[0048] Figure 9 This is a schematic diagram of the first partial cross-sectional structure of a 3D printing device for a thermoplastic protective layer in a building pipe according to the present invention.

[0049] Figure 10This is a second partial cross-sectional structural schematic diagram of a 3D printing device for a thermoplastic protective layer in a building pipe according to the present invention.

[0050] Figure 11 This is a flow chart of a method for using the 3D printing device for thermoplastic protective layers in building pipes described in the present invention.

[0051] In the figure: 1. Moving mechanism; 2. 3D printer head; 3. Cooling circulator; 4. Coaxial power adjustment structure; 5. Coaxial cleaner; 11. Support main rod; 12. Positioning threaded seat; 13. Travel motor; 14. First support rod; 15. Second support rod; 16. Moving roller; 21. Print inlet pipe; 22. Material diverter seat; 23. Print nozzle; 24. Print nozzle; 31. Outer tube; 32. Inner tube; 33. Diverter cold channel; 34. Circulation return pipe; 35. Return ring sleeve; 36. Through groove; 37. Interface; 38. Cooling pipe; 41. Support sleeve; 42. Drive turbine; 43. Output shaft; 51. Bearing; 52. Cleaning shaft seat; 53. Cleaning support rod; 54. Cleaning wiper block; 221. Mounting plate; 222. Movable seat. DETAILED DESCRIPTION

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0053] See also Figure 1-11 , the present invention provides an implementation scheme: Although the current 3D printing technology in pipelines has made progress in the field of composite pipe manufacturing and repair, it still faces multiple challenges: the traditional abrasive flow has high flow resistance due to high viscosity abrasives, resulting in low processing efficiency and insufficient improvement in surface roughness. The residual abrasive is difficult to remove, which threatens the safety of the pipeline; the existing equipment has weak adaptability in complex pipelines such as variable diameter / bends, and cannot achieve uniform repair. In particular, the deep oxygen-deficient environment will significantly inhibit the activity of microbial repair agents and restrict the repair depth; template-free construction is prone to cause interlayer gaps and shrinkage cracks, and conventional chemical repairs are difficult to simultaneously close microscopic defects, seriously affecting the durability of the structure. This technical solution targets the above-mentioned core bottlenecks, and through innovative equipment structure and process collaborative design, focuses on breakthroughs in three key technologies: efficient residue-free internal surface treatment, adaptive repair of complex pipelines, and interlayer bonding reinforcement.

[0054] Example 1: According to the instructions attached Figure 1 -Attached Figure 10It can be seen that in order to solve the above problems, the present application discloses a 3D printing device for thermoplastic protective layer in building pipes, including a moving mechanism 1, which is composed of a plurality of scissor-type adjustment devices arranged in a star shape, a moving roller 16 installed on the scissor-type adjustment device, and a regulator for adjusting the scissor-type adjustment device. Figure 1 -Attached Figure 4 It can be seen that the scissor-type adjustment device changes the radial position of the equipment support point through its telescopic movement to adapt to different working environments. The mobile roller 16 carries the equipment and contacts the working surface such as the inner wall of the pipe. A travel motor 13 is provided on one side of the mobile roller 16 to drive the mobile roller 16 to rotate, and the entire equipment is driven to move through the friction with the working surface such as the inner wall of the pipe. The adjuster drives the scissor-type adjustment device to extend and retract synchronously through linear motion, thereby jointly realizing stable support, precise leveling and height adjustment of the equipment. A 3D printing mechanism is installed on the mobile mechanism 1 for automatic printing in the pipeline.

[0055] According to the instruction manual Figure 1 -Attached Figure 10 It can be seen that the above-mentioned 3D printing mechanism includes a printing inlet pipe 21, and a 3D printer head 2 is connected to one side of the printing inlet pipe 21 for inputting environmentally friendly building slurry such as high molecular polymer from an external feeding system into the printing head. A cooling circulator 3 is connected to one side of the 3D printer head 2, and the cooling circulator 3 provides cooling water for the 3D printer head 2 and cleverly utilizes the kinetic energy of the cooling water to drive related rotating parts.

[0056] Specifically, the cooling circulator 3 is provided with a coaxial power regulating structure 4, which drives the 3D printer head 2 to rotate through the cooling circulating water. Its core function is to efficiently convert the fluid kinetic energy of the cooling water into mechanical rotational energy. The coaxial power regulating structure 4 is provided with a coaxial cleaner 5, which rotates synchronously with the 3D printer head 2 to realize the automatic cleaning function during the printing process.

[0057] Then according to the instructions Figure 1-3 It can be seen that the coaxial cleaner 5, the coaxial power adjustment structure 4 and the 3D printer head 2 are all located in the axial direction of the moving mechanism 1, ensuring the precise synchronization and strict coaxiality of power transmission and rotational motion, and avoiding motion interference.

[0058] According to the instruction manual Figure 5 -Attached Figure 10It can be seen that the 3D printer head 2 includes a material diverter seat 22, which is arranged on one side of the mobile mechanism 1 to obtain a stable basic support. The material diverter seat 22 is connected to the printing inlet pipe 21 to receive the printing slurry. The material diverter seat 22 is ringed with at least one pair of printing nozzles 23. The printing slurry is diverted to different printing nozzles 23 through the diversion effect of the material diverter seat 22. A printing nozzle 24 is connected to the end of the printing nozzle 23 for extruding the slurry as needed.

[0059] According to the instruction manual Figure 5 -Attached Figure 10 It can be seen that the coaxial power adjustment structure 4 includes a support sleeve 41, which is sleeved on the head end of the moving mechanism 1 as a fixed shell of the power conversion mechanism. A driving turbine 42 is arranged on the inside of the support sleeve 41, and the cooling circulator 3 passes through the central axis of the regulator and corresponds to the driving turbine 42 in the support sleeve 41. The cooling circulating water of the cooling circulator 3 impacts the driving turbine 42 at high speed to rotate the driving turbine 42. This process is a key step in converting water power into mechanical rotation. One end of the driving turbine 42 is connected to an output shaft 43, and the output shaft 43 is connected to the movable part of the material diverter seat 22, thereby directly transmitting the rotational power to the material diverter seat 22, driving the printing nozzle 23 and the nozzle to revolve around the central axis of the equipment, and then in order to clean the internal area of ​​the spray pipeline, the shaft end of the output shaft 43 passes through the material diverter seat 22 and is connected to the coaxial cleaner 5, realizing the synchronous transmission of rotational power to the coaxial cleaner 5.

[0060] According to the instructions attached Figure 1 -Attached Figure 4 It can be seen that the above-mentioned adjuster includes a supporting main rod 11, which is a rod with a columnar structure and an external thread structure at one end to constitute the main body and threaded driving part of the adjuster. A positioning threaded seat 12 is threadedly connected to the supporting main rod 11, and the internal thread of the positioning threaded seat 12 is engaged with the external thread of the supporting main rod 11. The positioning threaded seat 12 is movably connected to the end of the second support rod 15 of the scissors-type adjustment device. When the positioning threaded seat 12 is rotated, the thread side effect causes the positioning threaded seat 12 and the supporting main rod 11 to undergo axial relative displacement, thereby pulling or pushing the positioning threaded seat 12. The movement of the positioning threaded seat 12 directly drives the fulcrum of the scissors-type adjustment device connected to it, and finally causes all the star-shaped scissors mechanisms to extend and retract synchronously, thereby realizing the overall support position adjustment of the equipment.

[0061] According to the instructions attached Figure 1 -Attached Figure 4It can be seen that the above-mentioned scissor-type adjustment device includes a first support rod 14 installed on the side of the support sleeve 41 as a fixed fulcrum, and a second support rod 15 connected to the first support rod 14 in a scissor-like manner as a movable fulcrum. The end of the second support rod 15 is movably connected to the positioning thread seat 12 to receive the push and pull force from the adjuster. The outer ends of the second support rod 15 and the first support rod 14 are respectively provided with movable rollers 16. When the adjuster drives the positioning thread seat 12 to move axially, the end of the second support rod 15 moves accordingly, forcing the scissor-like structure formed by the first support rod 14 and the second support rod 15 to change the angle, so that the outer ends of the first support rod 14 and the second support rod 15, that is, the positions where the movable rollers 16 are installed, synchronously produce radial extension or contraction movements, so that the equipment can firmly and adaptively support working surfaces of different sizes, such as the inner walls of pipes of different diameters.

[0062] According to the instructions attached Figure 5 -Attached Figure 10 It can be seen that the cooling circulator 3 includes an outer tube 31, an inner tube 32 and a shunt cold channel 33. The inner tube 32 is connected to the inner cavity of the support main rod 11 to provide structural support and serve as an input path. The inner tube 32 is coaxially arranged in the outer tube 31 to form an annular reflux channel with the outer tube 31. The inner tube 32 is connected to the support sleeve 41 and guides the high-pressure cooling water to impact the blades of the drive turbine 42. This is the core driving process. The outer ring of the printing nozzle 23 and the printing nozzle 24 is provided with a cooling pipe 38 for directly cooling the high-temperature nozzle and nozzle. A number of shunt cold channels 33 are arranged on the support sleeve 41 to receive the cooling water after impacting the turbine. The shunt cold channel 33 is connected to the cooling pipe 38 to guide the cooling water to the cooling pipe 38 to perform a direct cooling function.

[0063] The cooling circulator 3 also includes a circulation return pipe 34, which is connected to the cooling pipe 38 for recovering the cooling water after absorbing heat. The cooling pipe 38 is connected to the annulus between the outer pipe 31 and the inner pipe 32 through the circulation return pipe 34, forming a complete cooling water return path. A return ring 35 is provided on the outside of the outer pipe 31. The return ring 35 is connected to the annulus between the outer pipe 31 and the inner pipe 32 as a transfer interface 37 between the circulation return pipe 34 and the annular return channel. The return ring 35 is movably connected to the outer pipe 31, allowing the circulation return pipe 34 to move synchronously with the movement of the 3D printer head 2 without interference. The cooling water enters the annulus between the outer pipe 31 and the inner pipe 32 through the circulation return pipe 34 for reflux, and finally completes the cooling cycle.

[0064] According to the instructions attached Figure 5 -Attached Figure 10It can be seen that a number of through grooves 36 are provided on the outer tube 31 as the entrances of the annular return channel, and a pair of ring plates are provided on both sides of the through grooves 36 for positioning and forming sealing surfaces. The return ring sleeve 35 is sleeved on a pair of ring plates to achieve relatively movable connection. The return ring sleeve 35 is a plate with an annular structure. An interface 37 is integrally provided on the return ring sleeve 35 to connect with the circulating return pipe 34 to receive hot water from the cooling pipe 38. A pair of ring plates are sealedly connected to the return ring sleeve 35, for example, through a sealing ring. Its key function is to effectively seal the return cooling water when the return ring sleeve 35 and the outer tube 31 are relatively movable or fixed, so that it can only flow into the annular space between the outer tube 31 and the inner tube 32 through the through grooves 36 without leakage, thereby ensuring the airtightness of the cooling cycle.

[0065] According to the instruction manual Figure 5 -Attached Figure 10 It can be seen that the above-mentioned material diversion seat 22 is composed of a mounting plate 221 connected to the support sleeve 41 as a fixed part, and a movable seat 222 nested and connected to the mounting plate 221 as a rotating part. A feed port is provided on the mounting plate 221 to connect with the printing inlet tube 21 to receive printing slurry. The printing nozzle 23 extends radially from the movable seat 222 and rotates with the movable seat 222. The printing nozzle 23 is connected to the inner cavity of the movable seat 222 so that the slurry can flow to the nozzle. A sealing slip ring is provided between the movable seat 222 and the mounting plate 221; when the movable seat 222 is driven by the output shaft 43 to rotate relative to the fixed mounting plate 221, the sealing slip ring effectively seals the connection interface between the inner cavity of the movable seat 222 and the feed port of the mounting plate 221 to prevent slurry leakage and ensure that the slurry can only flow smoothly through the printing nozzle 23 to the printing nozzle 24.

[0066] According to the instruction manual Figure 5 -Attached Figure 10 It can be seen that the above-mentioned coaxial cleaner 5 can be linked with the coaxial power adjustment structure 4 through a gear set if speed and direction need to be changed, or more directly through the output shaft 43. The core is to receive the rotational power from the output shaft 43. The coaxial cleaner 5 includes a cleaning shaft seat 52, and the cleaning shaft seat 52 is connected to the end of the output shaft 43 and is directly driven to rotate by the output shaft 43. A number of cleaning support rods 53 are provided on the cleaning shaft seat 52, and a number of cleaning wiping blocks 54 are provided at the ends of the cleaning support rods 53 as terminals for performing cleaning actions. The cleaning support rods 53 are telescopic rod structures, which allow the radial position of the cleaning wiping blocks 54 to be manually adjusted according to actual cleaning needs such as component size or nozzle position, so that they can effectively reach and clean the area near the printing nozzle 24.

[0067] Example 2: According to the instructions attached Figure 11 It can be seen that in order to match the above-mentioned 3D printing device for thermoplastic protective layer inside building pipelines to perform 3D printing construction inside pipelines, the present application also discloses a method for using the 3D printing device for thermoplastic protective layer inside building pipelines, including the following steps:

[0068] Step 1. Equipment positioning and leveling: Move the equipment to the predetermined construction location, start the travel motor to drive the moving rollers to initially position the equipment, rotate the positioning threaded seat to change its relative position with the supporting main rod. Since the positioning threaded seat is connected to the scissor-type adjustment device, this action will drive the scissor-type mechanism to extend and retract, so that the scissor-type adjustment devices in multiple directions of the equipment are in contact with the inner wall of the pipeline, ensuring that the equipment is placed firmly and horizontally on the pipeline working surface;

[0069] Step 2: Loading printing materials: Connect the environmentally friendly printing slurry used in the building pipeline to the printing inlet pipe through the feeding system. The slurry flows into the feed port of the material diverter seat through the printing inlet pipe, filling its inner cavity and preparing for printing;

[0070] Step 3: Pre-adjust the coaxial cleaner: Manually adjust the length of the cleaning rod on the coaxial cleaner according to the cleaning requirements of the printed component so that the cleaning wipe block is in the appropriate radial position;

[0071] Step 4: Cooling system connection: connect the external water source or coolant supply pipeline to the inlet and outlet of the cooling circulator. The inlet is the end of the inner tube coaxially arranged at the end of the moving device, and the outlet is connected to the annulus of the inner tube and the outer tube.

[0072] Step 5: Printing in the pipe: Start the feeding system and press the printing slurry into the material diversion seat through the printing inlet pipe. The slurry is diverted to the printing nozzles arranged on the movable seat and finally extruded from the printing nozzle. The cooling water circulation is started simultaneously. Driven by pressure, the cooling water flows out of the inner pipe at high speed, impacting the driving turbine in the support sleeve, driving the turbine to rotate, driving the output shaft connected to it to rotate. The output shaft synchronously drives two key components:

[0073] Step 5.1. Movement of the material diverter seat: The output shaft causes the entire annularly distributed printing nozzle and printing head to revolve around the central axis of the equipment, realizing the extrusion trajectory of the printing head;

[0074] Step 5.2, the coaxial cleaner's activities: the cleaning shaft seat, cleaning rod and cleaning wiper rotate synchronously with the output shaft, automatically cleaning the residual material splashed or accumulated near the print head, keeping the printing area clean;

[0075] Step 6. Printing process monitoring and adjustment: Monitor the extrusion state and molding quality of the printing slurry, observe whether the cooling water circulation is normal, ensure that the 3D printer head is effectively cooled to prevent overheating, and indirectly adjust the speed of the drive turbine by controlling the flow and pressure of the cooling water, thereby controlling the rotation speed of the print head and cleaner;

[0076] Step 7, cooling water circulation and recovery: After the cooling water impacts the driven turbine to do work, it flows into the bypass cooling channel arranged on the support sleeve. The bypass cooling channel guides the cooling water to the printing nozzle and the cooling pipe arranged outside the printing nozzle to directly cool the high-temperature printing nozzle. The cooling water after absorbing heat is collected from the cooling pipe to the circulation return pipe. The circulation return pipe transports the hot water / hot coolant back to the return annulus. The hot water / hot coolant enters the annulus between the outer pipe and the inner pipe through the return annulus, and flows back along this annulus to the equipment inlet or the external recovery / cooling device, completing a cycle.

[0077] Step 8. Printing end and cleaning: Stop the feeding system, interrupt the printing slurry supply, keep the cooling water circulating for a while, and continue to cool the print head until the temperature drops to a safe range, then stop the cooling water circulation;

[0078] Step 9. Equipment folding and moving: Operate the adjuster, reversely rotate the supporting main rod or positioning threaded seat to retract the scissor-type adjustment device and lower the height of the equipment to a state that is easy to move.

[0079] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A 3D printing device for thermoplastic protective layers in building pipes, comprising a moving mechanism (1), wherein the moving mechanism (1) is composed of a plurality of scissor-type adjustment devices arranged in a star shape, a moving roller (16) mounted on the scissor-type adjustment devices, and an adjuster for adjusting the scissor-type adjustment devices, characterized in that: A 3D printing mechanism is installed on the mobile mechanism (1); The 3D printing mechanism comprises a printing inlet pipe (21), one side of the printing inlet pipe (21) is connected to a 3D printer head (2), the upper portion of the 3D printer head (2) is connected to a cooling circulator (3), and the cooling circulator (3) provides cooling water for the 3D printer head (2); The cooling circulator (3) is provided with a coaxial power regulating structure (4), and the coaxial power regulating structure (4) drives the 3D printer head (2) to rotate through the cooling circulating water. The coaxial power regulating structure (4) is provided with a coaxial cleaner (5), and the coaxial cleaner (5) rotates synchronously with the 3D printer head (2); The coaxial cleaner (5), the coaxial power adjustment structure (4) and the 3D printer head (2) are all located in the same axial direction; The 3D printer head (2) includes a material diverter seat (22), the material diverter seat (22) is arranged on one side of the moving mechanism (1), the material diverter seat (22) is connected to the printing inlet pipe (21), and at least one pair of printing nozzles (23) are arranged around the material diverter seat (22), and the ends of the printing nozzles (23) are connected to the printing nozzles (24); The coaxial power adjustment structure (4) includes a support sleeve (41), the support sleeve (41) is sleeved on the head end of the moving mechanism (1), a driving turbine (42) is provided inside the support sleeve (41), the cooling circulator (3) passes through the central axis of the regulator, the cooling circulator (3) corresponds to the driving turbine (42) in the support sleeve (41), the cooling circulating water of the cooling circulator (3) impacts the driving turbine (42) to rotate the driving turbine (42), one end of the driving turbine (42) is connected to an output shaft (43), and the output shaft (43) is connected to the material diverter seat (22); The shaft end of the output shaft (43) passes through the material diversion seat (22) and is connected to the coaxial cleaner (5).

2. A 3D printing device for thermoplastic protective layer inside building pipes according to claim 1, characterized in that: The adjuster comprises a supporting main rod (11), the supporting main rod (11) is a rod with a columnar structure and one end of which is an external thread structure, a positioning thread seat (12) is threadedly connected to the supporting main rod (11), and the positioning thread seat (12) is connected to a scissor-type adjusting device.

3. The 3D printing device for thermoplastic protective layer inside building pipes according to claim 2, characterized in that: A travel motor (13) is provided on one side of the moving roller (16), and the travel motor (13) drives the moving roller (16) to rotate.

4. A 3D printing device for thermoplastic protective layer inside building pipes according to claim 3, characterized in that: The scissor-type adjustment device comprises a first support rod (14) mounted on the side of a support sleeve (41), a second support rod (15) connected to the first support rod (14) in a scissor-type manner, the end of the second support rod (15) being movably connected to a positioning threaded seat (12), and outer ends of the second support rod (15) and the first support rod (14) are respectively provided with movable rollers (16).

5. The 3D printing device for thermoplastic protective layer inside building pipes according to claim 4, characterized in that: The cooling circulator (3) includes an outer tube (31), an inner tube (32) and a shunt cooling channel (33). The inner tube (32) is connected to the inner cavity of the supporting main rod (11). The inner tube (32) is coaxially arranged in the outer tube (31). The inner tube (32) is connected to the supporting sleeve (41) to drive the driving turbine (42) to rotate. A plurality of shunt cooling channels (33) are arranged on the upper ring of the supporting sleeve (41). The outer ring of the printing nozzle (23) and the printing nozzle (24) is provided with a cooling pipe (38), and the shunt cooling channel (33) is connected to the cooling pipe (38).

6. A 3D printing device for thermoplastic protective layer inside building pipes according to claim 5, characterized in that: The material diversion seat (22) is composed of a mounting plate (221) connected to the support sleeve (41) as a fixed part, and a movable seat (222) nested and connected to the mounting plate (221) as a rotating part. The mounting plate (221) is provided with a feed port connected to the printing feed pipe (21). The printing nozzle (23) extends radially from the movable seat (222). The printing nozzle (23) is communicated with the inner cavity of the movable seat (222). A sealing slip ring is provided between the movable seat (222) and the mounting plate (221).

7. A 3D printing device for thermoplastic protective layer inside building pipes according to claim 6, characterized in that: The coaxial cleaner (5) and the coaxial power regulating structure (4) are linked to each other via a bearing (51) to reduce drag.

8. The 3D printing device for thermoplastic protective layer inside building pipes according to claim 7, characterized in that: The cooling circulator (3) further comprises a circulation return pipe (34), wherein the circulation return pipe (34) is connected to the cooling pipe (38), and the cooling pipe (38) is connected to the annular space between the outer pipe (31) and the inner pipe (32) through the circulation return pipe (34). A return annular sleeve (35) is provided on the outside of the outer pipe (31), and the return annular sleeve (35) is connected to the annular space between the outer pipe (31) and the inner pipe (32), and the return annular sleeve (35) is movably connected to the outer pipe (31), and cooling water enters the annular space between the outer pipe (31) and the inner pipe (32) through the circulation return pipe (34) for reflux.

9. The 3D printing device for thermoplastic protective layer inside building pipes according to claim 8, characterized in that: The outer tube (31) is provided with a plurality of through grooves (36), a pair of ring plates are provided on both sides of the plurality of through grooves (36), the return ring sleeve (35) is sleeved on the pair of ring plates, the return ring sleeve (35) is a plate with an annular structure, an interface (37) is integrally provided on the return ring sleeve (35) for connection with the circulation return pipe (34), and the pair of ring plates are sealedly connected to the return ring sleeve (35).

10. A method for using a 3D printing device for thermoplastic protective layers inside building pipes, applied to the 3D printing device for thermoplastic protective layers inside building pipes according to any one of claims 1 to 9, characterized in that: The steps include: Step 1. Equipment positioning and leveling: Move the equipment to the predetermined construction location, start the travel motor to drive the moving rollers to initially position the equipment, rotate the positioning threaded seat to change its relative position with the supporting main rod. Since the positioning threaded seat is connected to the scissor-type adjustment device, this action will drive the scissor-type mechanism to extend and retract, so that the scissor-type adjustment devices in multiple directions of the equipment are in contact with the inner wall of the pipeline, ensuring that the equipment is placed firmly and horizontally on the pipeline working surface; Step 2: Loading printing materials: Connect the environmentally friendly printing slurry used in the building pipeline to the printing inlet pipe through the feeding system. The slurry flows into the feed port of the material diverter seat through the printing inlet pipe, filling its inner cavity and preparing for printing; Step 3: Pre-adjust the coaxial cleaner: Manually adjust the length of the cleaning rod on the coaxial cleaner according to the cleaning requirements of the printed component so that the cleaning wipe block is in the appropriate radial position; Step 4: Cooling system connection: connect the external water source or coolant supply pipeline to the inlet and outlet of the cooling circulator. The inlet is the end of the inner tube coaxially arranged at the end of the moving device, and the outlet is connected to the annulus of the inner tube and the outer tube. Step 5: Printing in the pipe: Start the feeding system and press the printing slurry into the material diversion seat through the printing inlet pipe. The slurry is diverted to the printing nozzles arranged on the movable seat and finally extruded from the printing nozzle. The cooling water circulation is started simultaneously. Driven by pressure, the cooling water flows out of the inner pipe at high speed, impacting the driving turbine in the support sleeve, driving the turbine to rotate, driving the output shaft connected to it to rotate. The output shaft synchronously drives two key components: Step 5.

1. Movement of the material diverter seat: The output shaft causes the entire annularly distributed printing nozzle and printing head to revolve around the central axis of the equipment, realizing the extrusion trajectory of the printing head; Step 5.2, the coaxial cleaner's activities: the cleaning shaft seat, cleaning rod and cleaning wiper rotate synchronously with the output shaft, automatically cleaning the residual material splashed or accumulated near the print head, keeping the printing area clean; Step 6. Printing process monitoring and adjustment: Monitor the extrusion state and molding quality of the printing slurry, observe whether the cooling water circulation is normal, ensure that the 3D printer head is effectively cooled to prevent overheating, and indirectly adjust the speed of the drive turbine by controlling the flow and pressure of the cooling water, thereby controlling the rotation speed of the print head and cleaner; Step 7, cooling water circulation and recovery: After the cooling water impacts the driven turbine to do work, it flows into the bypass cooling channel arranged on the support sleeve. The bypass cooling channel guides the cooling water to the printing nozzle and the cooling pipe arranged outside the printing nozzle to directly cool the high-temperature printing nozzle. The cooling water after absorbing heat is collected from the cooling pipe to the circulation return pipe. The circulation return pipe transports the hot water / hot coolant back to the return annulus. The hot water / hot coolant enters the annulus between the outer pipe and the inner pipe through the return annulus, and flows back along this annulus to the equipment inlet or the external recovery / cooling device, completing a cycle. Step 8. Printing end and cleaning: Stop the feeding system, interrupt the printing slurry supply, keep the cooling water circulating for a while, and continue to cool the print head until the temperature drops to a safe range, then stop the cooling water circulation; Step 9. Equipment folding and moving: Operate the adjuster, reversely rotate the supporting main rod or positioning threaded seat to retract the scissor-type adjustment device and lower the height of the equipment to a state that is easy to move.

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