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

Abstract

The invention discloses a 3D printing device and method for a thermoplastic protective layer in a building pipeline, and the device comprises a moving mechanism which is composed of a plurality of scissor-type adjusting devices which are arranged in a star shape, moving rollers which are installed on the scissor-type adjusting devices, and an adjuster which is used for adjusting the scissor-type adjusting devices. A 3D printing mechanism is mounted on the moving mechanism; the invention relates to the technical field of building 3D printing, and provides an environment-friendly and high-stability solution aiming at the problems of insufficient cleaning, temperature control defects, low construction efficiency and the like of an existing pipeline inner wall 3D printing technology by integrating pipeline pretreatment, active cooling and efficient printing functions. Through the coaxial cleaning-cooling-printing integrated design, the function limitation of existing pipeline inner wall 3D printing equipment is broken through, and the operation stability and the finished product quality of the equipment in a narrow and complex environment are remarkably improved while environment-friendly construction is guaranteed, a high polymer material of the pipeline inner wall is saved and energy consumption is reduced.

Description

Technical Field

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

[0002] Traditional construction methods rely on a large amount of formwork erection, concrete pouring and manual operations, which not only lead to excessive consumption of materials such as wood and steel, but also increase the environmental load due to problems such as construction dust and wastewater discharge. 3D printing technology, through digital modeling and additive manufacturing, realizes the precise on-demand distribution of materials and significantly reduces waste. Therefore, the application of 3D printing technology in the field of building 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 increased by about 40% compared with 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 the need for molds, and further reduce resource consumption.

[0004] In the specific scenario of building construction, the 3D printing technology for the inner wall of pipelines shows unique application potential. The inner wall repair and reinforcement of underground pipe galleries, oil and gas pipelines and building drainage systems have long relied on manual operations or traditional prefabricated parts, which have problems such as high construction difficulty, long cycle and insufficient accuracy. By directly forming inside the pipeline with a 3D printing device, the efficient construction of customized structures can be realized. For example, printing a lining layer with anti-corrosion, wear-resistant or flow-guiding functions can significantly improve the service life and operation efficiency of the pipeline. With the advancement of smart cities and underground space development, the market demand for 3D printing of the inner wall of pipelines will continue to grow.

[0005] Therefore, at the present stage, 3D printing devices developed based on in-pipeline construction equipment have also emerged, but this technology still has significant shortcomings. Taking the patent with the patent number CN109624317B as an example, it discloses a 3D printing device inside a pipeline, which forms components by moving the printing head. However, the technical solution does not integrate a pipeline cleaning function and a nozzle cooling system. In actual applications, the inner wall of the pipeline is often attached with oil stains or particulate impurities. If not pretreated in advance, the bonding strength between the printing material and the substrate will be greatly reduced, resulting in component detachment or unqualified performance. At the same time, usually the pipeline is relatively long, and during the continuous printing process, the nozzle is prone to overheating due to the continuous output of high-temperature materials (such as thermoplastic polymers), which may cause material carbonization or equipment failure. This patent only relies on passive heat dissipation and cannot meet the long-term operation requirements, and there is a risk of construction interruption, directly affecting the operation efficiency and finished product quality.

[0006] Therefore, there is an urgent need for an environmentally friendly 3D printing device that integrates pipeline preprocessing, active nozzle cooling, and intelligent monitoring functions, which has become the key to breaking through the bottleneck of existing technologies. By optimizing the cleaning and temperature control links in the printing process, the construction accuracy of 3D printing on the inner wall of the pipeline and the equipment stability can be improved, promoting the development of this technology towards large-scale and high-efficiency directions, and realizing the green and intelligent upgrade in the field of construction. Summary of the Invention

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

[0008] To achieve the above objectives, the present invention is realized through the following technical solutions: A 3D printing device for a thermoplastic protective layer inside a building pipeline includes a moving mechanism, which consists of a plurality of scissor-type adjusting devices arranged in a star shape, moving rollers installed on the scissor-type adjusting devices, and a regulator for adjusting the scissor-type adjusting devices. A 3D printing mechanism is installed on the moving mechanism;

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

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

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

[0012] The 3D printer head includes a material distribution seat, which is arranged on one side of the moving mechanism and is connected to the printing inlet pipe. There are no less than a pair of printing nozzles arranged around the material distribution seat, and the end of the printing nozzle is connected to a printing head;

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

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

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

[0016] One side of the moving roller is provided with a traveling motor, and the traveling motor drives the moving roller to rotate.

[0017] The scissor-type adjusting device includes a first support rod installed on the side of the support sleeve seat, and a second support rod scissor-connected to the first support rod. The end of the second support rod is movably connected to the positioning thread seat, and moving rollers are respectively arranged at the outer ends of the second support rod and the first support rod.

[0018] The cooling circulator includes an outer tube, an inner tube and a shunt cooling channel. The inner tube is communicated with the inner cavity of the supporting main rod. The inner tube is coaxially arranged in the outer tube. The inner tube communicates with the support sleeve seat to drive the driving turbine to rotate. A plurality of shunt cooling channels are distributed around the support sleeve seat. Cooling tubes are arranged outside the printing nozzle and the printing head.

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

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

[0021] The cooling circulator further includes a circulation return pipe, which is connected to the cooling pipe. The cooling pipe is communicated with the annulus between the outer tube and the inner tube through the circulation return pipe. A reflux ring sleeve is arranged outside the outer tube, and the reflux ring sleeve is communicated with the annulus between the outer tube and the inner tube and is movably connected to the outer tube. Cooling water enters the annulus between the outer tube and the inner tube through the circulation return pipe for reflux.

[0022] A plurality of through grooves are arranged on the outer tube, and a pair of ring pieces are arranged on both sides of the plurality of through grooves. The reflux ring sleeve is sleeved on the pair of ring pieces. The reflux ring sleeve is a plate with an annular structure. An interface is integrally arranged on the reflux ring sleeve and is connected to the circulation return pipe. The pair of ring pieces are hermetically connected to the reflux ring sleeve.

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

[0024] Step 1. Equipment positioning and leveling: Move the equipment to the predetermined construction position, start the traveling motor to drive the moving rollers to make the equipment initially in place, rotate the positioning screw seat to change its relative position with the main support rod. Since the positioning screw seat is connected to the scissor-type adjusting device, this action will drive the scissor mechanism to expand and contract, so that the scissor-type adjusting devices in multiple directions of the equipment are in contact with the inner wall of the pipeline, ensuring that the equipment is firmly and horizontally placed within the pipeline working surface;

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

[0026] Step 3. Preliminary adjustment of the coaxial cleaner: Manually adjust the length of the cleaning support rod on the coaxial cleaner according to the cleaning requirements of the component to be printed, so that the cleaning wiping block is in a suitable radial position;

[0027] Step 4. Connection of the cooling system: Connect the external water source or coolant supply pipeline to the inlet end and outlet end of the cooling circulator. The inlet end is the pipe end of the inner pipe coaxially arranged at the end of the moving device, and the outlet end communicates with the annulus between the inner pipe and the outer pipe;

[0028] Step 5. Printing inside the pipeline: Start the feeding system, press the printing slurry into the material diversion seat through the printing inlet pipe. The slurry is diverted to the printing nozzles distributed around the movable seat and finally extruded from the printing nozzles. Synchronously start the cooling water circulation. Under the drive of pressure, the cooling water flows out of the inner pipe at high speed, impacts the drive turbine in the support sleeve seat, the drive turbine rotates, drives the output shaft connected to it to rotate, and the output shaft synchronously drives two key components:

[0029] Step 5.1. Movement of the material diversion seat: The output shaft makes the entire annularly distributed printing nozzles and printing nozzles revolve around the central axis of the equipment to realize the extrusion trajectory of the printing nozzles;

[0030] Step 5.2. Movement of the coaxial cleaner: The cleaning shaft seat, cleaning support rod and cleaning wiping block rotate synchronously with the output shaft to automatically clean the residual materials splashed or accumulated near the printing nozzles and keep the printing area clean;

[0031] Step 6. Monitoring and adjustment during printing: Monitor the extrusion state and forming 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 then indirectly adjust the rotation speed of the drive turbine by controlling the flow rate and pressure of the cooling water, so as to control the rotation speed of the printing nozzles and the cleaner;

[0032] Step 7, Cooling water circulation and recovery: After the cooling water impacts and drives the turbine to do work, it flows into the shunt cooling channels distributed around the upper ring of the support socket. The shunt cooling channels direct the cooling water to the cooling pipes arranged outside the printing nozzle and the printing head, directly cooling the high-temperature printing head. The cooling water after absorbing heat converges from the cooling pipes into the circulation return pipe. The circulation return pipe transports the hot water / hot coolant back to the reflux ring sleeve. The hot water / hot coolant enters the annulus between the outer pipe and the inner pipe through the reflux ring sleeve and returns to the equipment inlet end or an external recovery / cooling device along this annulus to complete one cycle;

[0033] Step 8, End of printing and cleaning: Stop the feeding system, interrupt the supply of printing slurry, keep the cooling water circulation running for a period of time, continue to cool the print head until the temperature drops to a safe range, and then stop the cooling water circulation;

[0034] Step 9, Folding and moving the equipment: Operate the regulator, reverse-rotate the main support rod or the positioning threaded seat, so that the scissor-type adjustment device contracts and reduces the height of the equipment to a state convenient for movement.

[0035] Beneficial effects: The present invention provides a 3D printing device and method for a thermoplastic protective layer inside a building pipeline. By integrating functions of pipeline pretreatment, active cooling, and efficient printing, aiming at problems such as insufficient cleaning, temperature control defects, and low construction efficiency in the existing 3D printing technology for the inner wall of pipelines, an environmentally friendly and highly stable solution is proposed. Through an integrated design of coaxial cleaning-cooling-printing, the functional limitations of existing 3D printing equipment for the inner wall of pipelines are broken through. While ensuring environmentally friendly construction, saving high-polymer materials for the inner wall of pipelines, and reducing energy consumption, the operation stability and finished product quality of the equipment in narrow and complex environments are significantly improved. It also has the following technical effects.

[0036] 1. The coaxial cleaner and the print head work together to solve the problem of low bonding strength of the inner wall of the pipeline. 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 continuously scrapes off the oil stains and particulate impurities on the inner wall of the pipeline in real time, ensuring direct contact between the thermoplastic material and the substrate, and avoiding interlayer peeling or unqualified performance caused by attachments.

[0037] 2. The cooling circulator is coupled with the power adjustment structure to solve the problems of overheating of the print head and carbonization of the material. The cooling circulator provides circulating cooling water for the print head through the inner pipe and the shunt cooling channels. At the same time, it uses the water flow impact to drive the turbine and converts the cooling power into the rotational driving force of the print head, achieving "dual use of one water". It not only avoids the working temperature of the print head being too high due to the thermoplastic material through active cooling, causing carbonization of the thermoplastic material during pipeline printing, but also replaces the traditional motor with hydraulic drive, reducing additional energy consumption, lowering energy consumption, and prolonging the working time of the print head.

[0038] 3. The multi-nozzle annular layout optimizes the printing efficiency and material utilization rate. The material diversion seat ring is provided with no less than a pair of printing nozzles. Combining with the rotation function of the print head, the 360° printing of the annular inner lining layer can be completed in a single pass, greatly improving the material utilization rate, enhancing the printing efficiency and speed, and significantly shortening the construction period.

[0039] 4. The star-shaped scissor-type moving mechanism enhances 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 the changes in the diameters of various pipelines, and the travel control is convenient. Compared with the traditional linear moving mechanism, the passability in various pipelines is significantly improved. Brief Description of the Drawings

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

[0041] Figure 2 It is the top view structural schematic diagram of a 3D printing device for a thermoplastic protective layer in a building pipeline according to the present invention.

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

[0043] Figure 4 It is the three-dimensional structural schematic diagram of the moving mechanism of a 3D printing device for a thermoplastic protective layer in a building pipeline according to the present invention.

[0044] Figure 5 It is the sectional structural schematic diagram of a 3D printing device for a thermoplastic protective layer in a building pipeline according to the present invention.

[0045] Figure 6 It is the first three-dimensional structural schematic diagram of the 3D printing mechanism of a 3D printing device for a thermoplastic protective layer in a building pipeline according to the present invention.

[0046] Figure 7 It is the second three-dimensional structural schematic diagram of the 3D printing mechanism of a 3D printing device for a thermoplastic protective layer in a building pipeline according to the present invention.

[0047] Figure 8 It is the blasting structural schematic diagram of a 3D printing device for a thermoplastic protective layer in a building pipeline according to the present invention.

[0048] Figure 9 It is the first partial sectional structural schematic diagram of a 3D printing device for a thermoplastic protective layer in a building pipeline according to the present invention.

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

[0050] Figure 11 This is a flowchart of the usage method of a 3D printing device for a thermoplastic protective layer inside a building pipeline according to 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, main support rod; 12, positioning threaded seat; 13, traveling motor; 14, first support rod; 15, second support rod; 16, moving roller; 21, printing inlet pipe; 22, material distribution seat; 23, printing nozzle; 24, printing head; 31, outer pipe; 32, inner pipe; 33, shunt cooling channel; 34, circulation return pipe; 35, return ring sleeve; 36, through groove; 37, interface; 38, cooling pipe; 41, support sleeve seat; 42, driving turbine; 43, output shaft; 51, bearing; 52, cleaning shaft seat; 53, cleaning support rod; 54, cleaning wiping block; 221, mounting plate; 222, movable seat. Specific embodiments

[0052] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0053] Please refer to Figures 1-11 , the present invention provides an implementation scheme: Although the current in-pipe 3D printing technology has made progress in the field of composite pipe manufacturing and repair, it still faces multiple challenges: The traditional abrasive flow has a large flow resistance due to the high viscosity of the abrasive, resulting in low processing efficiency, insufficient improvement of surface roughness, and difficult removal of residual abrasive, which threatens the pipeline safety; The existing equipment has weak adaptability in complex pipelines such as variable diameter / bent pipes and cannot achieve uniform repair. Especially in the deep anoxic environment, the activity of the microbial repair agent will be significantly inhibited, restricting the repair depth; Template-free construction is prone to cause interlayer gaps and shrinkage cracks, and conventional chemical repair is difficult to synchronously seal microscopic defects, seriously affecting the structural durability. This technical solution aims at the above core bottlenecks and focuses on breaking through three key technologies: efficient residue-free inner surface treatment, adaptive repair of complex pipelines, and strengthening of interlayer bonding through innovative collaborative design of equipment structure and process.

[0054] Example 1: According to the attached drawings of the specification Figure 1 - attached Figure 10It can be seen that to solve the above problems, the present application discloses a 3D printing device for a thermoplastic protective layer inside a building pipeline, including a moving mechanism 1. The moving mechanism 1 consists of a plurality of scissor-type adjusting devices arranged in a star shape, moving rollers 16 installed on the scissor-type adjusting devices, and a regulator for adjusting the scissor-type adjusting devices. According to the appended Figure 1 - appended Figure 4 It can be seen that the scissor-type adjusting device changes the radial position of the equipment support point through its telescopic movement to adapt to different working environments. The moving rollers 16 carry the equipment and contact the working surface, such as the inner wall of the pipeline. A traveling motor 13 is arranged on one side of the moving rollers 16 to drive the moving rollers 16 to rotate, and the entire equipment is driven to move through the friction force with the working surface, such as the inner wall of the pipeline. The regulator drives the scissor-type adjusting device to synchronously expand and contract through a linear motion, jointly realizing the stable support, precise leveling, and height adjustment of the equipment. A 3D printing mechanism is installed on the moving mechanism 1 for automatic printing inside the pipeline.

[0055] According to the appended Figure 1 - appended Figure 10 It can be seen that the above 3D printing mechanism includes a printing inlet pipe 21. One side of the printing inlet pipe 21 is connected to a 3D printer head 2 for inputting an environmentally friendly building slurry, such as a polymer, from an external feeding system into the print head. One side of the 3D printer head 2 is connected to a cooling circulator 3. 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 relevant rotating components.

[0056] Specifically, a coaxial power adjustment structure 4 is arranged on the above cooling circulator 3. The coaxial power adjustment structure 4 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. A coaxial cleaner 5 is arranged on the coaxial power adjustment structure 4. The coaxial cleaner 5 rotates synchronously with the 3D printer head 2 to realize the automatic cleaning function during the printing process.

[0057] Furthermore, according to the appended Figures 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 on the axis of the moving mechanism 1, ensuring the precise synchronization and strict coaxiality of power transmission and rotational movement, and avoiding motion interference.

[0058] According to the appended Figure 5 - appended Figure 10It can be seen that the 3D printer head 2 includes a material shunt base 22. The material shunt base 22 is arranged on one side of the moving mechanism 1 to obtain a stable basic support. The material shunt base 22 is connected to the printing inlet pipe 21 to receive printing slurry. There are no less than a pair of printing nozzles 23 arranged around the material shunt base 22. The printing slurry is shunted into different printing nozzles 23 through the shunting function of the material shunt base 22. A printing head 24 is connected to the end of the printing nozzle 23 for extruding the slurry as needed to form a shape.

[0059] According to the attached instructions Figure 5 - Attachment Figure 10 It can be seen that the coaxial power adjustment structure 4 includes a support sleeve base 41. The support sleeve base 41 is sleeved on the head end of the moving mechanism 1 as a fixed housing of the power conversion mechanism. A driving turbine 42 is arranged inside the support sleeve base 41. The cooling circulator 3 passes through the central axis of the regulator and corresponds to the driving turbine 42 inside the support sleeve base 41. The cooling circulating water of the cooling circulator 3 impacts the driving turbine 42 at high speed to make the driving turbine 42 rotate. 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. The output shaft 43 is connected to the movable part of the material shunt base 22, so as to directly transmit the rotational power to the material shunt base 22, drive the printing nozzles 23 and the nozzle to revolve around the central axis of the device. Furthermore, in order to clean the inner area of the spraying pipeline, the shaft end of the output shaft 43 penetrates through the material shunt base 22 and is connected to the coaxial cleaner 5 to realize the synchronous transmission of the rotational power to the coaxial cleaner 5.

[0060] According to the attached instructions Figure 1 - Attachment Figure 4 It can be seen that the above-mentioned regulator includes a support main rod 11. The support main rod 11 is a rod with a cylindrical structure and one end is an external thread structure, constituting the main body and the threaded driving part of the regulator. A positioning threaded seat 12 is threadedly connected to the support main rod 11. The internal thread of the positioning threaded seat 12 meshes with the external thread of the support main rod 11. The positioning threaded seat 12 is movably connected to the end of the second support rod 15 of the scissor-type adjustment device. When the positioning threaded seat 12 is rotated, the threaded side effect causes an axial relative displacement between the positioning threaded seat 12 and the support main rod 11, and then pulls or pushes the positioning threaded seat 12. The movement of the positioning threaded seat 12 directly drives the fulcrum of the scissor-type adjustment device connected to it, and finally causes all the scissor mechanisms arranged in a star shape to expand and contract synchronously, realizing the adjustment of the overall support position of the device.

[0061] According to the attached instructions Figure 1 - Attachment Figure 4It can be seen that the above-mentioned scissor-type adjusting device includes a first support rod 14 installed on the side of the support socket 41 as a fixed fulcrum, and a second support rod 15 scissor-connected to the first support rod 14 as a movable fulcrum. The end of the second support rod 15 is movably connected to the positioning threaded seat 12 to receive the pushing and pulling force from the adjuster. Moving rollers 16 are respectively arranged at the outer ends of the second support rod 15 and the first support rod 14. When the adjuster drives the positioning threaded seat 12 to axially move, the end of the second support rod 15 moves accordingly, forcing the angle of the scissor structure formed by the first support rod 14 and the second support rod 15 to change. As a result, the outer ends of the first support rod 14 and the second support rod 15, that is, the positions where the moving rollers 16 are installed, synchronously generate radial stretching or contracting movements, enabling the device to firmly and adaptively support on work surfaces of different sizes, such as the inner walls of pipes with different diameters.

[0062] According to the attached description Figure 5 - Attachment Figure 10 It can be seen that the cooling circulator 3 includes an outer pipe 31, an inner pipe 32, and a shunt cooling channel 33. The inner pipe 32 is communicated with the inner cavity of the support main rod 11 to provide structural support and serve as an input passage. The inner pipe 32 is coaxially arranged in the outer pipe 31 to form an annular space return channel with the outer pipe 31. The inner pipe 32 is communicated with the support socket 41 and guides high-pressure cooling water to impact and drive the blades of the turbine 42. This is the core driving process. Cooling pipes 38 are arranged outside the printing nozzle 23 and the printing head 24 for directly cooling the high-temperature nozzle and the head. A number of shunt cooling channels 33 are distributed on the support socket 41 for receiving the cooling water after impinging on the turbine. The shunt cooling channels 33 are communicated with the cooling pipes 38 to direct the cooling water to the cooling pipes 38 to perform the direct cooling function.

[0063] The cooling circulator 3 further includes a circulation return pipe 34. The circulation return pipe 34 is connected to the cooling pipe 38 for recovering the cooling water after absorbing heat. The cooling pipe 38 is communicated with the annular space between the outer pipe 31 and the inner pipe 32 through the circulation return pipe 34 to form a complete cooling water return path. A return ring sleeve 35 is arranged outside the outer pipe 31. The return ring sleeve 35 is communicated with the annular space between the outer pipe 31 and the inner pipe 32 as a transfer interface 37 between the circulation return pipe 34 and the annular space return channel. The return ring sleeve 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 annular space 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 attached description Figure 5 - Attachment Figure 10It can be known that a plurality of through grooves 36 are provided on the outer pipe 31 as the inlets of the annulus return channels. A pair of annular plates are arranged on both sides of the plurality of through grooves 36 for positioning and forming a sealing surface. The return ring sleeve 35 is sleeved on the pair of annular plates to achieve a 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 and connected to the circulation return pipe 34 to receive hot water from the cooling pipe 38. The pair of annular plates are hermetically 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 pipe 31 are relatively movable or fixed, so that it can only flow into the annulus between the outer pipe 31 and the inner pipe 32 through the through grooves 36 without leakage, ensuring the tightness of the cooling cycle.

[0065] According to the attached drawings of the specification Figure 5 - attached drawings Figure 10 It can be known that the above-mentioned material shunt seat 22 has a mounting plate 221 connected to the support sleeve seat 41 as the fixed part, and a movable seat 222 nested with the mounting plate 221 as the rotating part. A feed port is provided on the mounting plate 221 and connected to the printing inlet pipe 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 communicated with 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, preventing slurry leakage and ensuring that the slurry can only smoothly flow to the printing nozzle 24 through the printing nozzle 23.

[0066] According to the attached drawings of the specification Figure 5 - attached drawings Figure 10 It can be known that the above-mentioned coaxial cleaner 5 can be linked through a gear set if speed change and direction change are required, or more directly through the output shaft 43 and the coaxial power adjustment structure 4. The core is to receive the rotational power from the output shaft 43. The coaxial cleaner 5 includes a cleaning shaft seat 52. 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 plurality of cleaning support rods 53 are provided on the cleaning shaft seat 52. A plurality of cleaning wiping blocks 54 are provided at the ends of the plurality of cleaning support rods 53 as the terminals for performing cleaning actions. The cleaning support rods 53 are of a telescopic rod structure, allowing the radial position of the cleaning wiping blocks 54 to be manually adjusted according to actual cleaning requirements, such as the size of the component or the position of the nozzle, so that it can effectively touch and clean the area near the printing nozzle 24.

[0067] Embodiment 2: According to the attached drawings of the specification Figure 11 It can be known that in order to match the above-mentioned 3D printing device for the thermoplastic protective layer inside the building pipe to perform 3D printing construction inside the pipe, the present application also discloses a use method of the 3D printing device for the thermoplastic protective layer inside the building pipe, including the following steps:

[0068] Step 1: Equipment positioning and leveling: Move the equipment to the predetermined construction position, start the traveling motor to drive the moving rollers to make the equipment preliminarily in place, rotate the positioning threaded seat to change its relative position with the main support rod. Since the positioning threaded seat is connected to the scissor-type adjusting device, this action will drive the scissor mechanism to expand and contract, so that the scissor-type adjusting devices in multiple directions of the equipment are all in contact with the inner wall of the pipeline, ensuring that the equipment is firmly and horizontally placed within the pipeline working surface;

[0069] Step 2: Loading of printing materials: Connect the environmentally friendly printing slurry for building pipelines to the printing inlet pipe through the feeding system. The slurry flows into the feeding port of the material shunt seat through the printing inlet pipe and fills its inner cavity to prepare for printing;

[0070] Step 3: Preliminary adjustment of the coaxial cleaner: Manually adjust the length of the cleaning support rod on the coaxial cleaner according to the cleaning requirements of the component to be printed, so that the cleaning wiping block is in a suitable radial position;

[0071] Step 4: Connection of the cooling system: Connect the external water source or coolant supply pipeline to the inlet end and outlet end of the cooling circulator. The inlet end is the pipe end of the inner pipe coaxially arranged at the end of the moving device, and the outlet end communicates with the annulus between the inner pipe and the outer pipe;

[0072] Step 5: Printing inside the pipeline: Start the feeding system, press the printing slurry into the material shunt seat through the printing inlet pipe. The slurry is shunted to the printing nozzles distributed around the movable seat and finally extruded from the printing nozzles. Synchronously start the cooling water circulation. Under the drive of pressure, the cooling water flows out of the inner pipe at high speed, impacts the drive turbine in the support sleeve seat, and the drive turbine rotates, 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 shunt seat: The output shaft makes the entire annularly distributed printing nozzles and printing nozzles revolve around the central axis of the equipment to realize the extrusion trajectory of the printing nozzles;

[0074] Step 5.2: Movement of the coaxial cleaner: The cleaning shaft seat, cleaning support rod and cleaning wiping block rotate synchronously with the output shaft to automatically clean the residual materials splashed or accumulated near the printing nozzles and keep the printing area clean;

[0075] Step 6: Monitoring and adjustment during printing: Monitor the extrusion state and forming 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 then indirectly adjust the rotation speed of the drive turbine by controlling the flow rate and pressure of the cooling water, so as to control the rotation speed of the printing nozzles and the cleaner;

[0076] Step 7, Cooling water circulation and recovery: After the cooling water impacts and drives the turbine to do work, it flows into the diverging cooling channels distributed around the upper ring of the support socket. The diverging cooling channels direct the cooling water to the cooling pipes arranged outside the printing nozzle and the outer ring of the printing head to directly cool the high-temperature printing head. The cooling water after absorbing heat converges from the cooling pipes into the circulation return pipe. The circulation return pipe transports the hot water / hot coolant back to the reflux ring sleeve. The hot water / hot coolant enters the annulus between the outer pipe and the inner pipe through the reflux ring sleeve and flows back along this annulus to the equipment inlet end or an external recovery / cooling device to complete one cycle;

[0077] Step 8, End of printing and cleaning: Stop the feeding system, interrupt the supply of printing slurry, keep the cooling water circulation running for a period of time, continue to cool the print head until the temperature drops to a safe range, and then stop the cooling water circulation;

[0078] Step 9, Folding up and moving the equipment: Operate the regulator, rotate the main support rod or the positioning threaded seat in the reverse direction to make the scissor-type adjustment device contract and reduce the height of the equipment to a state convenient for movement.

[0079] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A 3D printing device for a thermoplastic protective layer inside a building pipeline, comprising a moving mechanism (1). The moving mechanism (1) consists of a plurality of scissor-type adjusting devices arranged in a star shape, moving rollers (16) installed on the scissor-type adjusting devices, and a regulator for adjusting the scissor-type adjusting devices, characterized in that, A 3D printing mechanism is installed on the moving mechanism (1). The 3D printing mechanism includes a printing inlet pipe (21). One side of the printing inlet pipe (21) is connected to a 3D printer head (2). A cooling circulator (3) is connected to the 3D printer head (2). The cooling circulator (3) provides cooling water for the 3D printer head (2). A coaxial power adjustment structure (4) is arranged on the cooling circulator (3). The coaxial power adjustment structure (4) drives the 3D printer head (2) to rotate through the cooling circulating water. A coaxial cleaner (5) is arranged on the coaxial power adjustment structure (4). 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 on the same axis. The 3D printer head (2) includes a material distribution seat (22). The material distribution seat (22) is arranged on one side of the moving mechanism (1). The material distribution seat (22) is connected to the printing inlet pipe (21). Not less than a pair of printing nozzles (23) are arranged around the material distribution seat (22). The end of the printing nozzle (23) is connected to a printing head (24). The coaxial power adjustment structure (4) includes a support sleeve seat (41). The support sleeve seat (41) is sleeved on the head end of the moving mechanism (1). A driving turbine (42) is arranged inside the support sleeve seat (41). The cooling circulator (3) penetrates through the central axis of the regulator. The cooling circulator (3) corresponds to the driving turbine (42) inside the support sleeve seat (41). The cooling circulating water of the cooling circulator (3) impacts the driving turbine (42) to make the driving turbine (42) rotate. One end of the driving turbine (42) is connected to an output shaft (43). The output shaft (43) is connected to the material distribution seat (22). The shaft end of the output shaft (43) penetrates through the material distribution seat (22) and is connected to the coaxial cleaner (5).

2. The 3D printing device for the thermoplastic protective layer inside the building pipeline according to claim 1, wherein, The regulator includes a support main rod (11). The support main rod (11) is a rod with a cylindrical structure and one end has an external thread structure. A positioning thread seat (12) is threadedly connected to the support main rod (11). The positioning thread seat (12) is connected to a scissor-type adjustment device.

3. The 3D printing device for the thermoplastic protective layer inside the building pipeline according to claim 2, wherein, A traveling motor (13) is arranged on one side of the moving roller (16). The traveling motor (13) drives the moving roller (16) to rotate.

4. A 3D printing device for a thermoplastic protective layer inside a building pipeline according to claim 3, characterized in that, The scissor-type adjustment device includes a first support rod (14) installed on the side of the support sleeve seat (41), and a second support rod (15) scissor-connected to the first support rod (14). The end of the second support rod (15) is movably connected to the positioning thread seat (12). Moving rollers (16) are respectively arranged at the outer ends of the second support rod (15) and the first support rod (14).

5. The 3D printing device for the thermoplastic protective layer inside a building pipeline according to claim 4, wherein, The cooling circulator (3) includes an outer tube (31), an inner tube (32), and a shunt cooling channel (33). The inner tube (32) is communicated with 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 communicated with the supporting socket (41) to drive the driving turbine (42) to rotate. A plurality of shunt cooling channels (33) are distributed around the supporting socket (41). A cooling tube (38) is arranged outside the printing nozzle (23) and the printing head (24). The shunt cooling channel (33) is communicated with the cooling tube (38).

6. The 3D printing device for the thermoplastic protective layer inside a building pipeline according to claim 5, wherein, The material shunt seat (22) consists of a mounting plate (221) connected to the supporting socket (41) and a movable seat (222) nestedly connected to the mounting plate (221). A feed port is arranged on the mounting plate (221) and connected to the printing inlet 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 arranged between the movable seat (222) and the mounting plate (221).

7. The 3D printing device for the thermoplastic protective layer inside a building pipeline according to claim 6, wherein, The coaxial cleaner (5) and the coaxial power adjustment structure (4) are linked with reduced resistance through a bearing (51).

8. A 3D printing device for a thermoplastic protective layer inside a building pipeline according to claim 7, characterized in that, The cooling circulator (3) further includes a circulating return pipe (34). The circulating return pipe (34) is connected to the cooling tube (38). The cooling tube (38) is communicated with the annulus between the outer tube (31) and the inner tube (32) through the circulating return pipe (34). A reflux ring sleeve (35) is arranged outside the outer tube (31). The reflux ring sleeve (35) is communicated with the annulus between the outer tube (31) and the inner tube (32), and the reflux ring sleeve (35) is movably connected to the outer tube (31). Cooling water enters the annulus between the outer tube (31) and the inner tube (32) through the circulating return pipe (34) for reflux.

9. The 3D printing device for the thermoplastic protective layer inside a building pipeline according to claim 8, characterized in that, A plurality of through grooves (36) are arranged on the outer tube (31). A pair of ring pieces are arranged on both sides of the plurality of through grooves (36). The reflux ring sleeve (35) is sleeved on the pair of ring pieces. The reflux ring sleeve (35) is a plate with an annular structure. An interface (37) is integrally arranged on the reflux ring sleeve (35) and connected to the circulating return pipe (34). The pair of ring pieces are hermetically connected to the reflux ring sleeve (35).

10. A method of using a 3D printing device for a thermoplastic protective layer inside a building pipeline, which is applied to the 3D printing device for a thermoplastic protective layer inside a building pipeline according to any one of the above claims 1-9, characterized in that, It includes the following steps: Step 1, equipment positioning and leveling: Move the equipment to the predetermined construction position, start the traveling motor to drive the moving rollers to make the equipment initially in place. Rotate the positioning screw seat to change its relative position with the supporting main rod. Since the positioning screw seat is connected to the scissor-type adjusting device, this action will drive the scissor mechanism to expand and contract, so that the scissor-type adjusting devices in multiple directions of the equipment are all in contact with the inner wall of the pipeline, ensuring that the equipment is firmly and horizontally placed in the pipeline working surface; Step 2, printing material loading: Connect the environmentally friendly printing slurry for building pipelines to the printing inlet pipe through the feeding system. The slurry flows into the feed port of the material shunt seat through the printing inlet pipe and fills its inner cavity to prepare for printing; Step 3, pre-adjustment of the coaxial cleaner: According to the cleaning requirements of the component to be printed, manually adjust the length of the cleaning support rod on the coaxial cleaner so that the cleaning wiping block is in a suitable radial position; Step 4. Cooling System Connection: Connect an external water source or coolant supply pipeline to the inlet end and the outlet end of the cooling circulator. The inlet end is the pipe end of the inner pipe coaxially arranged at the end of the mobile device, and the outlet end communicates with the annulus between the inner pipe and the outer pipe; Step 5. Printing inside the Pipeline: Start the feeding system, press the printing slurry into the material distribution seat through the printing inlet pipe. The slurry is distributed to the printing nozzles annularly arranged on the movable seat and finally extruded from the printing nozzles. Synchronously start the cooling water circulation. Under the drive of pressure, the cooling water flows out of the inner pipe at high speed, impacts the drive turbine in the support sleeve seat, the drive turbine rotates, drives the output shaft connected thereto to rotate, and the output shaft synchronously drives two key components: Step 5.

1. Movement of the Material Distribution Seat: The output shaft makes the entire annularly distributed printing nozzles and printing nozzles revolve around the central axis of the equipment, realizing the extrusion trajectory of the printing nozzles; Step 5.

2. Movement of the Coaxial Cleaner: The cleaning shaft seat, the cleaning support rod and the cleaning wiping block rotate synchronously with the output shaft, automatically cleaning the residual materials splashed or accumulated near the printing nozzles, and keeping the printing area clean; Step 6. Monitoring and Adjusting during the Printing Process: Monitor the extrusion state and forming 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 then indirectly adjust the rotation speed of the drive turbine by controlling the flow rate and pressure of the cooling water, so as to control the rotation speeds of the printing nozzles and the cleaner; Step 7. Cooling Water Circulation and Recovery: After the cooling water impacts the drive turbine to do work, it flows into the shunt cooling channels annularly arranged on the support sleeve seat. The shunt cooling channels direct the cooling water to the cooling pipes arranged outside the printing nozzles and the outer ring of the printing nozzles to directly cool the high-temperature printing nozzles. The cooling water after absorbing heat converges from the cooling pipes to the circulation return pipe. The circulation return pipe transports the hot water / hot coolant back to the return ring sleeve. The hot water / hot coolant enters the annulus between the outer pipe and the inner pipe through the return ring sleeve and returns to the equipment inlet end or an external recycling / cooling device along this annulus to complete a cycle; Step 8. End of Printing and Cleaning: Stop the feeding system, interrupt the supply of the printing slurry, keep the cooling water circulation running for a period of time, continue to cool the printing head until the temperature drops to a safe range, and then stop the cooling water circulation; Step 9. Folding and Moving of the Equipment: Operate the regulator, rotate the support main rod or the positioning thread seat in the reverse direction to make the scissor-type adjusting device contract and lower the height of the equipment to a state convenient for movement.

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