Steel-plastic composite pipe sealing forming device and method

Abstract

The invention relates to the technical field of steel-plastic composite pipe machining, and discloses a steel-plastic composite pipe sealing forming device and method.The steel-plastic composite pipe sealing forming device comprises a base, a supporting mechanism, a sealing mechanism, a grinding mechanism and a fixing plate are arranged at the top of the base, and a rotating shaft is rotationally installed in the fixing plate; the sealing mechanism comprises an extrusion cylinder and a spiral auger, the spiral auger is rotatably mounted in the extrusion cylinder, one end of the extrusion cylinder is communicated with a square-opening extrusion nozzle, and a preheating mechanism and a flattening mechanism are arranged on one side of the extrusion cylinder. The device is reasonable in design, the temperature of a plastic layer and the contact pressure of the flattening roller are monitored in real time through a closed-loop control system integrating the temperature sensor, the pressure sensor and the semiconductor refrigeration ring, the temperature sensor dynamically adjusts the power of the semiconductor refrigeration ring, and the cooling airflow temperature is accurately controlled; embrittlement caused by too fast cooling of the plastic layer or deformation caused by insufficient cooling is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of steel-plastic composite pipe processing, and particularly relates to a steel-plastic composite pipe sealing and forming device and method. Background Art

[0002] Due to its high strength, corrosion resistance and other characteristics, steel-plastic composite pipes are widely used in municipal engineering, petrochemical and other fields. The sealing treatment of its ports directly affects the sealing performance and service life of the pipeline, and needs to be completed through multiple processes such as grinding, molten plastic coating and flattening. However, the existing sealing processing technology still has the following bottlenecks:

[0003] 1. Low efficiency caused by discrete processes: Traditional equipment needs to complete grinding, preheating, plastic extrusion and flattening step by step. Multiple workpiece clamping is likely to introduce positioning errors, and the process connection efficiency is low, making it difficult to meet the requirements of mass production.

[0004] 2. Insufficient precision in temperature and pressure control: When spraying molten plastic, uneven preheating is likely to cause thermal stress concentration at the interface between the coating and the pipe body, leading to delamination or deformation; The cooling system mostly uses fixed nozzles, which cannot dynamically track the position of the flattening roller, resulting in uneven air flow coverage and local cooling lag, and the plastic layer is prone to warping.

[0005] 3. Limited adaptability of equipment: Most of the existing fixtures and support mechanisms are rigid structures, with poor compatibility for different pipe diameters, time-consuming adjustment and uneven clamping force distribution, and thin-walled pipe fittings are prone to pressure deformation; The grinding and extrusion mechanisms lack axial feed compensation and are difficult to adapt to the geometric errors at the pipe ends.

[0006] 4. Low degree of intelligence: Traditional processes rely on manual experience to adjust parameters, lacking real-time monitoring and feedback of temperature, pressure and cutting resistance. When the material properties fluctuate or the tool wears, problems such as uneven coating thickness and excessive surface roughness are likely to occur, and the finished product rate is unstable.

[0007] In the prior art, although some equipment has tried to integrate multiple processes or improve the cooling method, there are still significant defects. For example, some sealing devices use independently driven grinding and extrusion modules, but the coordination of complex movements is poor, resulting in chaotic processing timing; Some cooling systems introduce temperature control elements, but due to the fixed air flow path, they cannot adapt to the dynamic processing trajectory, and the cooling effect is limited; Therefore, we propose a steel-plastic composite pipe sealing and forming device and method to solve this problem. Summary of the Invention

[0008] The purpose of the present invention is to solve the above-mentioned disadvantages in the background art, and to propose a steel-plastic composite pipe sealing and forming device and method.

[0009] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0010] A steel-plastic composite pipe sealing and forming device, comprising: a base, on the top of the base, there are provided a support mechanism, a sealing mechanism, a grinding mechanism and a fixing plate. A rotating shaft is rotatably installed in the fixing plate, and one end of the rotating shaft is connected with a fixture. The sealing mechanism includes: an extrusion cylinder and a spiral auger. The spiral auger is rotatably installed in the extrusion cylinder. One end of the extrusion cylinder is communicated with a square extrusion nozzle. On one side of the extrusion cylinder, there are provided a preheating mechanism and a flattening mechanism. The flattening mechanism includes: a mounting frame, a flattening roller and two second pressure sensors. The flattening roller is rotatably installed in the mounting frame. A temperature sensor is embedded in the flattening roller. Compression boxes are fixedly installed at the top and bottom of the mounting frame. A piston plate is slidably installed in the compression box. Air spray pipes are communicated on one side of the two compression boxes close to each other.

[0011] Preferably, a first one-way valve is fixedly installed in the air spray pipe. The other side of the compression box is communicated with an air inlet pipe. A semiconductor refrigeration ring and a protective cover are fixedly sleeved on the outer side of the air inlet pipe. A second one-way valve is arranged in the air inlet pipe. One side of the piston plate is hinged with a linkage rod. Rotating arms are fixedly installed at both ends of the flattening roller. The other end of the linkage rod is rotatably sleeved on the outer side of the corresponding rotating arm. The second pressure sensor is fixedly installed on one side of the extrusion cylinder. A guide post and a compression spring are fixedly installed on one side of the second pressure sensor. The other end of the compression spring is fixedly connected with the mounting frame. The mounting frame is slidably sleeved on the outer side of the guide post.

[0012] Preferably, a feed pipe is communicated on the top of the extrusion cylinder. An extrusion motor is fixedly installed on the other side of the extrusion cylinder. The output shaft of the extrusion motor is fixedly installed at one end of the spiral auger. A heating cylinder and a heat preservation cover are fixedly sleeved on the outer side of the extrusion cylinder. The extrusion cylinder is slidably installed in the fixing plate. A first electric push rod is fixedly installed on one side of the fixing plate. A driving plate is fixedly installed on the output end of the first electric push rod. The driving plate is fixedly sleeved on the outer side of the extrusion cylinder.

[0013] Preferably, the grinding mechanism includes: a grinding wheel, a bracket, a grinding motor, a driving column and a second electric push rod. The bracket is fixedly installed on the output end of the second electric push rod. A vertical shaft and a horizontal shaft are rotatably installed in the bracket. The grinding wheel is fixedly sleeved on the outer side of the vertical shaft. Grinding sheets are integrally formed at the top and bottom of the grinding wheel. A driven bevel gear is fixedly installed on the vertical shaft. A driving bevel gear is fixedly installed at one end of the horizontal shaft. The driving bevel gear meshes with the driven bevel gear. A hexagonal prism is fixedly installed at the other end of the horizontal shaft. A hexagonal hole is opened at one end of the driving column. The hexagonal prism is slidably installed in the hexagonal hole. A driven gear is fixedly sleeved on the outer side of the driving column. A driving gear is fixedly installed on the output end of the grinding motor. The driving gear meshes with the driven gear;

[0014] A vertical plate is fixedly installed on the top of the base. The second electric push rod and the grinding motor are respectively fixedly installed on both sides of the vertical plate. The driving column is rotatably installed in the vertical plate. One side of the bracket is fixedly installed with a cross bar, and the cross bar is slidably installed in the vertical plate. The heat preservation cover is slidably installed on the top of the vertical plate.

[0015] Preferably, the preheating mechanism includes: a preheating plate, a mounting plate and two first pressure sensors. A mounting shell is fixedly installed on one side of the mounting plate. The preheating plate is fixedly installed in the mounting shell. The first pressure sensor is fixedly installed on one side of the extrusion barrel. A limiting column and a connecting spring are fixedly installed on one side of the first pressure sensor. The other end of the connecting spring is fixedly connected with the mounting plate. The mounting plate is slidably sleeved on the outside of the limiting column.

[0016] Preferably, the fixture includes: a mounting cylinder, a moving column, a cylinder and a plurality of clamping arms. One end of the clamping arm is hinged with a connecting rod, and the other end of the connecting rod is hinged on the outside of the moving column. One end of the moving column is fixedly installed with a moving disk. The output end of the cylinder is fixedly installed on the other side of the moving disk. A cross plate is fixedly installed on the side wall of the mounting cylinder. The moving disk is slidably sleeved on the outside of the cross plate. A plurality of sliding holes are formed in the outside of the mounting cylinder. The clamping arm is slidably installed in the corresponding sliding hole. The cylinder is fixedly installed on one side of the mounting cylinder. The other side of the mounting cylinder is fixedly connected with one end of a rotating shaft. A rotating motor is fixedly installed on one side of the fixed plate. The other end of the rotating shaft is fixedly installed on the output shaft of the rotating motor.

[0017] Preferably, the support mechanism includes: a third electric push rod, a lifting plate and two connecting shafts. The third electric push rod is fixedly installed on the top of the base. The lifting plate is fixedly installed on the output end of the third electric push rod. Cross beams are fixedly installed on the front and rear sides of the lifting plate. L-shaped plates are fixedly installed at both ends of the cross beam. The connecting shaft is rotatably installed in the corresponding L-shaped plate. Support wheels are fixedly installed at both ends of the connecting shaft. A vertical rod is slidably installed in the L-shaped plate. The bottom end of the vertical rod is fixedly connected with the base.

[0018] Preferably, a controller is fixedly installed on the top of the base. The temperature sensor, the second pressure sensor and the semiconductor refrigeration ring are in signal connection with the controller.

[0019] The present invention also provides a method for sealing and forming a steel-plastic composite pipe, which is applied to the above-mentioned steel-plastic composite pipe sealing and forming device, and includes the following steps:

[0020] S1: Sleeve the steel-plastic composite pipe onto the outside of the fixed cylinder, start the cylinder to drive the moving column to move leftward. The moving column drives the multiple clamping arms to move away from each other through multiple connecting rods, so that the multiple clamping arms abut against the inner wall of the steel-plastic composite pipe to achieve clamping and fixing. Start the third electric push rod to drive the lifting plate to move upward, thereby driving the four support wheels to move upward, so that the support wheels abut against the bottom of the steel-plastic composite pipe to achieve support. Then start the rotating motor to drive the rotating shaft and the clamp to rotate slowly, thereby driving the steel-plastic composite pipe to rotate;

[0021] S2: Start the grinding motor and the second electric push rod. The grinding motor drives the driving column to rotate through the meshing of the driving gear and the driven gear. The driving column drives the horizontal axis to rotate synchronously through the sliding cooperation between the hexagonal hole and the hexagonal prism. The horizontal axis drives the vertical axis and the grinding wheel to rotate at high speed through the meshing of the driving bevel gear and the driven bevel gear. The second electric push rod drives the bracket and the grinding wheel to move horizontally, so that the grinding wheel grinds the steel-plastic composite pipe while it rotates. After grinding is completed, the second electric push rod is controlled to drive the bracket to reset, and then the grinding motor is controlled to stop running.

[0022] S3: Start the first electric push rod to drive the extrusion barrel to move towards the side close to the steel-plastic composite pipe. After the preheating plate and the flattening roller come into contact with the steel-plastic composite pipe, continue to control the horizontal movement of the extrusion barrel, and compress the compression spring and the connecting spring. When the pressure values sensed by the first pressure sensor and the second pressure sensor reach the preset values, control the first electric push rod to stop running. Then start the preheating plate and the extrusion motor. The preheating plate preheats the steel-plastic composite pipe through contact with its end face. At the same time, the extrusion motor drives the spiral auger to convey the plastic introduced into the feeding pipe to the right, heats the plastic through the heating barrel to make it turn into a molten state, then extrudes it through the square-hole extrusion nozzle and coats it on the port of the steel-plastic composite pipe to form a thin plastic covering. Then, the thin plastic covering is flattened by the extrusion of the flattening roller. At the same time, the flattening roller rotates and drives the rotating arm to rotate. The rotating arm drives the two piston plates to reciprocate through the cooperation with the linkage rod, and under the cooperation of the first one-way valve and the second one-way valve, air enters the compression box through the air inlet pipe and then is sprayed onto the thin plastic covering through the air spray pipe to accelerate its cooling. The semiconductor refrigeration ring is started to refrigerate the air inlet pipe, thereby cooling the air inlet pipe and the air inside it. The temperature of the thin plastic covering is monitored by the temperature sensor, and when the temperature is monitored to rise, the power of the semiconductor refrigeration ring is controlled to increase to enhance the cooling effect, thereby enhancing the cooling and forming effect of the thin plastic covering. When the first pressure sensor monitors an increase in pressure, it indicates that a complete circle of the thin plastic covering is about to be completed. At this time, the controller controls the preheating plate to stop heating, and the extrusion motor continues to run, so as to continue spraying plastic on the surface of the steel-plastic composite pipe to form a thin-wall covering, and flatten it through the flattening roller and cool it by the air spray from the air spray pipe. During this period, the pressure value is continuously monitored by the second pressure sensor and the signal is transmitted to the controller. When the pressure value monitored by the second pressure sensor slowly rises, the controller determines that the work is normal. When the pressure value monitored by the second pressure sensor undergoes a sudden change, the controller determines that an abnormal situation has occurred, and controls the rotation motor and the extrusion motor to stop running to conduct problem troubleshooting. When the pressure value monitored by the second pressure sensor reaches the set value, control the extrusion motor and the rotation motor to stop running, and control the first electric push rod to drive the extrusion barrel to move horizontally and reset;

[0023] S4: Control the rotation motor to stop running, start the cylinder to drive the moving column to move in the reverse direction, release the clamping of the steel-plastic composite pipe, and thus complete the sealing work.

[0024] Compared with the prior art, the present invention provides a steel-plastic composite pipe sealing and forming device and method, which have the following beneficial effects:

[0025] (1) Through the composite motion design of the fixture rotation and the high-speed self-rotation of the grinding wheel, combined with the dynamic adjustment of the flattening roller feeding synchronously with the extrusion barrel, the multi-process integrated processing of surface grinding, molten plastic spraying and flattening forming is realized during the rotation of the steel-plastic composite pipe. The grinding slices of the grinding wheel cooperate with the driving bevel gear system to ensure uniform distribution of the cutting force; the flattening roller drives the reciprocating motion of the piston plate through the rotating arm, and drives the air jet pipe to dynamically spray cooling air flow, effectively eliminating the thermal stress of the plastic layer and avoiding warping and deformation. This composite motion mode significantly improves the processing efficiency and at the same time ensures the consistency of the sealing layer thickness and surface finish;

[0026] (2) Through the closed-loop control system integrating temperature sensors, pressure sensors and semiconductor refrigeration rings, the temperature of the plastic layer and the contact pressure of the flattening roller are monitored in real time. The temperature sensor dynamically adjusts the power of the semiconductor refrigeration ring to accurately control the temperature of the cooling air flow, preventing the plastic layer from becoming brittle due to excessive cooling or deforming due to insufficient cooling; the pressure sensor feedbacks through the elastic deformation of the compression spring and the connecting spring, and intelligently controls the feeding speed of the extrusion barrel and the pressure of the flattening roller, avoiding unevenness or breakage of the plastic layer caused by fluctuations in material hardness or equipment overload. This intelligent control mechanism greatly improves the process stability of the sealing forming and the qualified rate of finished products;

[0027] (3) The preheating plate locally preheats the port of the steel-plastic composite pipe through contact heating to reduce the temperature difference stress during molten plastic spraying; the air jet pipe combines the reciprocating motion of the piston plate and the semiconductor refrigeration ring to form a directional low-temperature air flow jet to achieve rapid and uniform cooling of the plastic layer. The sequential coordination design of preheating and dynamic cooling effectively inhibits interface delamination or pipe body deformation caused by differences in thermal expansion coefficients, and at the same time shortens the processing cycle. In addition, the air flow one-way control structure of the compression box and the one-way valve ensures the continuous and efficient output of the cooling air flow, avoiding local overheating problems caused by air flow stagnation in the traditional cooling system.

[0028] (4) The fixture drives the radial expansion and contraction of the clamping arm through the cylinder, and cooperates with the lifting plate and the supporting wheel of the supporting mechanism for multi-directional positioning to realize the adaptive clamping and stable support of steel-plastic composite pipes with different diameters. The grinding mechanism adopts the sliding transmission design of a hexagonal prism and a hexagonal hole, allowing the driving column and the horizontal axis to maintain power transmission during axial movement to ensure the feeding accuracy of the grinding wheel. The extrusion barrel and the preheating mechanism are linked by an electric push rod to achieve horizontal feeding and pressure self-compensation, adapting to the requirements of different pipe end sealing thicknesses. This modular integrated design significantly improves the compatibility of the equipment with workpieces of different specifications, reduces the changeover adjustment time, and meets the requirements of flexible production. Brief Description of the Drawings

[0029] Figure 1 It is a three-dimensional structural schematic diagram of a steel-plastic composite pipe sealing and forming device proposed by the present invention;

[0030] Figure 2Another perspective three-dimensional structure schematic diagram of a steel-plastic composite pipe sealing and forming device proposed by the present invention;

[0031] Figure 3 Cross-sectional structure schematic diagram of a steel-plastic composite pipe sealing and forming device proposed by the present invention;

[0032] Figure 4 For Figure 2 Partial enlarged view in;

[0033] Figure 5 For Figure 2 Another partial enlarged view in;

[0034] Figure 6 For Figure 2 Partial enlarged view of part A in;

[0035] Figure 7 Three-dimensional structure schematic diagram of the sealing mechanism proposed by the present invention;

[0036] Figure 8 Three-dimensional structure schematic diagram of the spiral auger proposed by the present invention;

[0037] Figure 9 Three-dimensional structure schematic diagram of the flattening mechanism proposed by the present invention;

[0038] Figure 10 Cross-sectional structure schematic diagram of the flattening mechanism proposed by the present invention;

[0039] Figure 11 For Figure 10 Partial enlarged view in;

[0040] Figure 12 Three-dimensional structure schematic diagram of the preheating mechanism proposed by the present invention;

[0041] Figure 13 Partial three-dimensional structure schematic diagram of the fixture proposed by the present invention;

[0042] Figure 14 Three-dimensional structure schematic diagram of the clamping arm and the connecting rod proposed by the present invention;

[0043] Figure 15 Three-dimensional structure schematic diagram of the support mechanism proposed by the present invention;

[0044] Figure 16 Three-dimensional structure schematic diagram of the grinding mechanism proposed by the present invention.

[0045] In the figure: 1, base; 101, fixed plate; 102, vertical plate; 2, support mechanism; 201, third electric push rod; 202, lifting plate; 203, cross beam; 204, L-shaped plate; 205, connecting shaft; 206, support wheel; 207, vertical rod; 3, fixture; 301, mounting cylinder; 302, clamping arm; 303, connecting rod; 304, moving column; 305, moving disk; 306, cylinder; 307, rotating shaft; 308, rotating motor; 4, grinding mechanism; 401, second electric push rod; 402, bracket; 403, vertical shaft; 404, grinding wheel; 405, driven bevel gear; 406, driving bevel gear; 407, hexagonal prism; 408, driving column; 409, grinding motor; 410, horizontal shaft; 411, driving gear; 412, driven gear; 5, sealing mechanism; 501, extrusion cylinder; 502, square extrusion nozzle; 503, spiral auger; 504, extrusion motor; 505, feed pipe; 506, heat preservation cover; 507, heating cylinder; 508, driving plate; 509, first electric push rod; 6, preheating mechanism; 601, first pressure sensor; 602, limit post; 603, mounting plate; 604, connecting spring; 605, mounting shell; 606, preheating plate; 7, flattening mechanism; 701, second pressure sensor; 702, guide post; 703, compression spring; 704, mounting frame; 705, flattening roller; 706, compression box; 707, air spraying pipe; 708, air inlet pipe; 709, protective cover; 710, semiconductor refrigeration ring; 711, first one-way valve; 712, second one-way valve; 713, rotating arm; 714, linkage rod; 715, piston plate; 716, temperature sensor; 8, controller. Detailed implementation manners

[0046] 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.

[0047] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0048] Refer to Figure 1-16, a steel-plastic composite pipe sealing and forming device, comprising: a base 1, a support mechanism 2, a sealing mechanism 5, a grinding mechanism 4 and a fixing plate 101 are arranged on the top of the base 1. A rotating shaft 307 is rotatably installed in the fixing plate 101. One end of the rotating shaft 307 is connected with a clamp 3. The sealing mechanism 5 includes: an extrusion cylinder 501 and a spiral auger 503. The spiral auger 503 is rotatably installed in the extrusion cylinder 501. One end of the extrusion cylinder 501 is communicated with a square extrusion nozzle 502. A preheating mechanism 6 and a flattening mechanism 7 are arranged on one side of the extrusion cylinder 501. The flattening mechanism 7 includes: a mounting frame 704, a flattening roller 705 and two second pressure sensors 701. The flattening roller 705 is rotatably installed in the mounting frame 704. A temperature sensor 716 is embedded in the flattening roller 705. Compression boxes 706 are fixedly installed at the top and bottom of the mounting frame 704. A piston plate 715 is slidably installed in the compression box 706. Air injection pipes 707 are communicated with one side of the two compression boxes 706 close to each other.

[0049] Preferably, a first one-way valve 711 is fixedly installed in the air injection pipe 707. The other side of the compression box 706 is communicated with an air inlet pipe 708. A semiconductor refrigeration ring 710 and a protective cover 709 are fixedly sleeved on the outer side of the air inlet pipe 708. A second one-way valve 712 is arranged in the air inlet pipe 708. One side of the piston plate 715 is hinged with a linkage rod 714. Rotating arms 713 are fixedly installed at both ends of the flattening roller 705. The other end of the linkage rod 714 is rotatably sleeved on the outer side of the corresponding rotating arm 713. The second pressure sensor 701 is fixedly installed on one side of the extrusion cylinder 501. A guide post 702 and a compression spring 703 are fixedly installed on one side of the second pressure sensor 701. The other end of the compression spring 703 is fixedly connected with the mounting frame 704. The mounting frame 704 is slidably sleeved on the outer side of the guide post 702.

[0050] Preferably, a feed pipe 505 is communicated with the top of the extrusion cylinder 501. An extrusion motor 504 is fixedly installed on the other side of the extrusion cylinder 501. The output shaft of the extrusion motor 504 is fixedly installed at one end of the spiral auger 503. A heating cylinder 507 and a heat preservation cover 506 are fixedly sleeved on the outer side of the extrusion cylinder 501. The extrusion cylinder 501 is slidably installed in the fixing plate 101. A first electric push rod 509 is fixedly installed on one side of the fixing plate 101. A driving plate 508 is fixedly installed at the output end of the first electric push rod 509. The driving plate 508 is fixedly sleeved on the outer side of the extrusion cylinder 501.

[0051] Preferably, the grinding mechanism 4 includes: a grinding wheel 404, a bracket 402, a grinding motor 409, a driving column 408, and a second electric push rod 401. The bracket 402 is fixedly installed on the output end of the second electric push rod 401. A vertical shaft 403 and a horizontal shaft 410 are rotatably installed in the bracket 402. The grinding wheel 404 is fixedly sleeved on the outside of the vertical shaft 403. Grinding sheets are integrally formed on both the top and bottom of the grinding wheel 404. A driven bevel gear 405 is fixedly installed on the vertical shaft 403. A driving bevel gear 406 is fixedly installed at one end of the horizontal shaft 410. The driving bevel gear 406 meshes with the driven bevel gear 405. A hexagonal prism 407 is fixedly installed at the other end of the horizontal shaft 410. A hexagonal hole is formed at one end of the driving column 408. The hexagonal prism 407 is slidably installed in the hexagonal hole. A driven gear 412 is fixedly sleeved on the outside of the driving column 408. A driving gear 411 is fixedly installed on the output end of the grinding motor 409. The driving gear 411 meshes with the driven gear 412;

[0052] A vertical plate 102 is fixedly installed on the top of the base 1. The second electric push rod 401 and the grinding motor 409 are respectively fixedly installed on both sides of the vertical plate 102. The driving column 408 is rotatably installed in the vertical plate 102. A cross bar is fixedly installed on one side of the bracket 402. The cross bar is slidably installed in the vertical plate 102. The heat preservation cover 506 is slidably installed on the top of the vertical plate 102.

[0053] Preferably, the preheating mechanism 6 includes: a preheating plate 606, a mounting plate 603, and two first pressure sensors 601. A mounting shell 605 is fixedly installed on one side of the mounting plate 603. The preheating plate 606 is fixedly installed in the mounting shell 605. The first pressure sensor 601 is fixedly installed on one side of the extrusion barrel 501. A limiting column 602 and a connecting spring 604 are fixedly installed on one side of the first pressure sensor 601. The other end of the connecting spring 604 is fixedly connected to the mounting plate 603. The mounting plate 603 is slidably sleeved on the outside of the limiting column 602.

[0054] The cam 306 is fixed on the side of the cam 308 and the cam 309 is fixed on the side of the cam 309.

[0055] Preferably, the support mechanism 2 includes: a third electric push rod 201, a lifting plate 202 and two connecting shafts 205, the third electric push rod 201 is fixedly installed on the top of the base 1, the lifting plate 202 is fixedly installed on the output end of the third electric push rod 201, and the front and rear sides of the lifting plate 202 are fixedly installed with a cross beam 203, and both ends of the cross beam 203 are fixedly installed with an L plate 204, the connecting shaft 205 is rotatably installed in the corresponding L plate 204, and both ends of the connecting shaft 205 are fixedly installed with a support wheel 206, and a vertical rod 207 is slidably installed in the L plate 204, and the bottom end of the vertical rod 207 is fixedly connected to the base 1.

[0056] Preferably, a controller 8 is fixedly installed on the top of the base 1 , and the temperature sensor 716 , the second pressure sensor 701 and the semiconductor refrigeration ring 710 are connected to the controller 8 via signals.

[0057] The present invention also provides a steel-plastic composite pipe sealing and forming method, which is applied to the above-mentioned steel-plastic composite pipe sealing and forming device, comprising the following steps:

[0058] S1: Sleeve the steel-plastic composite pipe onto the outside of the fixed cylinder, start the cylinder 306 to drive the moving column 304 to move leftward. The moving column 304 drives the multiple clamping arms 302 to move away from each other through the multiple connecting rods 303, so that the multiple clamping arms 302 abut against the inner wall of the steel-plastic composite pipe to achieve clamping and fixing. Start the third electric push rod 201 to drive the lifting plate 202 to move upward, thereby driving the four supporting wheels 206 to move upward, so that the supporting wheels 206 abut against the bottom of the steel-plastic composite pipe to achieve support. Then start the rotating motor 308 to drive the rotating shaft 307 and the clamp 3 to rotate slowly, thereby driving the steel-plastic composite pipe to rotate;

[0059] S2: Start the grinding motor 409 and the second electric push rod 401. The grinding motor 409 drives the driving column 408 to rotate through the meshing of the driving gear 411 and the driven gear 412. The driving column 408 drives the horizontal shaft 410 to rotate synchronously through the sliding fit of the hexagonal hole and the hexagonal prism 407. The horizontal shaft 410 drives the vertical shaft 403 and the grinding wheel 404 to rotate at high speed through the meshing of the driving bevel gear 406 and the driven bevel gear 405. The second electric push rod 401 drives the bracket 402 and the grinding wheel 404 to move horizontally, so that the grinding wheel 404 grinds the steel-plastic composite pipe when it rotates. After grinding, control the second electric push rod 401 to drive the bracket 402 to reset, and then control the grinding motor 409 to stop running;

[0060] S3: Start the first electric push rod 509 to drive the extrusion barrel 501 to move towards the side close to the steel-plastic composite pipe. After the preheating plate 606 and the flattening roller 705 come into contact with the steel-plastic composite pipe, continue to control the horizontal movement of the extrusion barrel 501, and compress the compression spring 703 and the connecting spring 604. When the pressure values sensed by the first pressure sensor 601 and the second pressure sensor 701 reach the preset value, control the first electric push rod 509 to stop operating. Then start the preheating plate 606 and the extrusion motor 504. The preheating plate 606 preheats the steel-plastic composite pipe through contact with its end face. At the same time, the extrusion motor 504 drives the spiral auger 503 to convey the plastic introduced into the feed pipe 505 to the right, heats the plastic through the heating cylinder 507 to turn it into a molten state, then extrudes it through the square-hole extrusion nozzle and coats it on the port of the steel-plastic composite pipe to form a thin plastic coating. Then, the thin plastic coating is flattened by the extrusion of the flattening roller 705. At the same time, the flattening roller 705 rotates and drives the rotating arm 713 to rotate. The rotating arm 713 drives the two piston plates 715 to reciprocate through cooperation with the linkage rod, and under the cooperation of the first one-way valve 711 and the second one-way valve 712, air enters the compression box 706 through the air inlet pipe 708 and then is sprayed onto the thin plastic coating through the air spray pipe 707 to accelerate its cooling. Start the semiconductor refrigeration ring 710 to refrigerate the air inlet pipe 708, thereby cooling the air inlet pipe 708 and the air inside it. Monitor the temperature of the thin plastic coating through the temperature sensor 716, and when the temperature is monitored to rise, control the power of the semiconductor refrigeration ring 710 to increase to enhance the cooling effect, thereby enhancing the cooling and forming effect of the thin plastic coating. When the first pressure sensor 601 monitors an increase in pressure, it indicates that a complete circle of thin plastic coating is about to be completed. At this time, the controller 8 controls the preheating plate 606 to stop heating, and the extrusion motor 504 continues to operate, so as to continue spraying plastic on the surface of the steel-plastic composite pipe to form a thin-wall coating, and flatten it through the flattening roller 705 and cool it by spraying air through the air spray pipe 707. During this period, continuously monitor the pressure value through the second pressure sensor 701 and transmit the signal to the controller 8. When the pressure value monitored by the second pressure sensor 701 slowly rises, the controller 8 determines that the work is normal. When the pressure value monitored by the second pressure sensor 701 undergoes a drastic change, the controller 8 determines that an abnormal condition has occurred, and controls the rotation motor 308 and the extrusion motor 504 to stop operating to conduct problem troubleshooting. When the pressure value monitored by the second pressure sensor 701 reaches the set value, control the extrusion motor 504 and the rotation motor 308 to stop operating, and control the first electric push rod 509 to drive the extrusion barrel 501 to move horizontally and reset;

[0061] S4: Control the rotation motor 308 to stop operating, start the cylinder 306 to drive the moving column 304 to move in the reverse direction, release the clamping of the steel-plastic composite pipe, and thus complete the sealing work.

[0062] In this embodiment, the processing efficiency and quality are significantly improved through multi-institutional collaborative control and intelligent feedback mechanism. Its core advantages are as follows: The integrated processing of multiple processes such as grinding, preheating, melting plastic extrusion, and flattening forming is realized by adopting compound motion design. The uniformity of the processing surface is ensured through the synergistic effect of the rotation of the fixture 3 and the high-speed self-rotation of the grinding wheel 404. The closed-loop control system integrating the temperature sensor 716 and the pressure sensor adjusts the preheating temperature, the intensity of the cooling air flow, and the flattening pressure in real time to suppress thermal stress deformation and coating warping.

[0063] In this embodiment, the plastic raw material introduced into the feed pipe 505 can be recycled waste plastic, thereby reducing costs.

[0064] The low-temperature air flow is directionally sprayed through the linkage of the piston plate 715 and the air jet pipe 707, combined with the precise temperature control of the semiconductor refrigeration ring 710, to accelerate the curing of the plastic layer and reduce the oxidation risk. The adaptive fixture 3 and the modular support mechanism 2 are adjusted by driving the clamping arm 302 and the electric push rod through the cylinder 306, which is compatible with workpieces of different pipe diameters and avoids clamping deformation. Through intelligent control and structural innovation, this device solves the problems of discrete traditional process procedures, lag in temperature and pressure control, and poor adaptability, and realizes the efficient sealing and forming of high-precision and low-deformation steel-plastic composite pipes.

[0065] The standard parts used in the present invention can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art. Coupled with the circuit connection adopting the conventional connection method in the prior art, it will not be elaborated here.

Claims

1. A steel-plastic composite pipe sealing and forming device, characterized in that, Including: A base (1), on the top of the base (1), there are provided a support mechanism (2), a sealing mechanism (5), a grinding mechanism (4) and a fixing plate (101). A rotating shaft (307) is rotatably installed in the fixing plate (101), and one end of the rotating shaft (307) is connected to a fixture (3). The sealing mechanism (5) includes an extrusion barrel (501) and a spiral auger (503). The spiral auger (503) is rotatably installed in the extrusion barrel (501). One end of the extrusion barrel (501) is communicated with a square extrusion nozzle (502). On one side of the extrusion barrel (501), there are provided a preheating mechanism (6) and a flattening mechanism (7). The flattening mechanism (7) includes a mounting frame (704), a flattening roller (705) and two second pressure sensors (701). The flattening roller (705) is rotatably installed in the mounting frame (704). A temperature sensor (716) is embedded in the flattening roller (705). Compression boxes (706) are fixedly installed at the top and bottom of the mounting frame (704). A piston plate (715) is slidably installed in the compression box (706). On one side of the two compression boxes (706) close to each other, there is communicated with a jet pipe (707).

2. The steel-plastic composite pipe sealing and forming device according to claim 1, wherein, A first one-way valve (711) is fixedly installed in the jet pipe (707). The other side of the compression box (706) is communicated with an air inlet pipe (708). A semiconductor refrigeration ring (710) and a protective cover (709) are fixedly sleeved on the outer side of the air inlet pipe (708). A second one-way valve (712) is arranged in the air inlet pipe (708). One side of the piston plate (715) is hinged with a linkage rod (714). Rotating arms (713) are fixedly installed at both ends of the flattening roller (705). The other end of the linkage rod (714) is rotatably sleeved on the outer side of the corresponding rotating arm (713). The second pressure sensor (701) is fixedly installed on one side of the extrusion barrel (501). A guide post (702) and a compression spring (703) are fixedly installed on one side of the second pressure sensor (701). The other end of the compression spring (703) is fixedly connected with the mounting frame (704). The mounting frame (704) is slidably sleeved on the outer side of the guide post (702).

3. The steel-plastic composite pipe sealing and forming device according to claim 2, wherein, A feed pipe (505) is communicated with the top of the extrusion barrel (501). An extrusion motor (504) is fixedly installed on the other side of the extrusion barrel (501). The output shaft of the extrusion motor (504) is fixedly installed at one end of the spiral auger (503). A heating barrel (507) and a heat preservation cover (506) are fixedly sleeved on the outer side of the extrusion barrel (501). The extrusion barrel (501) is slidably installed in the fixing plate (101). A first electric push rod (509) is fixedly installed on one side of the fixing plate (101). A driving plate (508) is fixedly installed at the output end of the first electric push rod (509). The driving plate (508) is fixedly sleeved on the outer side of the extrusion barrel (501).

4. The steel-plastic composite pipe sealing and forming device according to claim 3, characterized in that, The grinding mechanism (4) includes: a grinding wheel (404), a bracket (402), a grinding motor (409), a driving column (408), and a second electric push rod (401). The bracket (402) is fixedly installed on the output end of the second electric push rod (401). A vertical shaft (403) and a horizontal shaft (410) are rotatably installed in the bracket (402). The grinding wheel (404) is fixedly sleeved on the outside of the vertical shaft (403). Grinding sheets are integrally formed at the top and bottom of the grinding wheel (404). A driven bevel gear (405) is fixedly installed on the vertical shaft (403). A driving bevel gear (406) is fixedly installed at one end of the horizontal shaft (410). The driving bevel gear (406) meshes with the driven bevel gear (405). A hexagonal prism (407) is fixedly installed at the other end of the horizontal shaft (410). A hexagonal hole is formed at one end of the driving column (408). The hexagonal prism (407) is slidably installed in the hexagonal hole. A driven gear (412) is fixedly sleeved on the outside of the driving column (408). A driving gear (411) is fixedly installed on the output end of the grinding motor (409). The driving gear (411) meshes with the driven gear (412). A vertical plate (102) is fixedly installed on the top of the base (1). The second electric push rod (401) and the grinding motor (409) are respectively fixedly installed on both sides of the vertical plate (102). The driving column (408) is rotatably installed in the vertical plate (102). A cross bar is fixedly installed on one side of the bracket (402). The cross bar is slidably installed in the vertical plate (102). The heat preservation cover (506) is slidably installed on the top of the vertical plate (102).

5. The steel-plastic composite pipe sealing and forming device according to claim 4, characterized in that, The preheating mechanism (6) includes: a preheating plate (606), a mounting plate (603), and two first pressure sensors (601). A mounting shell (605) is fixedly installed on one side of the mounting plate (603). The preheating plate (606) is fixedly installed in the mounting shell (605). The first pressure sensor (601) is fixedly installed on one side of the extrusion barrel (501). A limiting column (602) and a connecting spring (604) are fixedly installed on one side of the first pressure sensor (601). The other end of the connecting spring (604) is fixedly connected to the mounting plate (603). The mounting plate (603) is slidably sleeved on the outside of the limiting column (602).

6. The steel-plastic composite pipe sealing and forming device according to claim 5, characterized in that, The fixture (3) includes: a mounting cylinder (301), a moving column (304), a cylinder (306), and a plurality of clamping arms (302). One end of the clamping arm (302) is hinged with a connecting rod (303), the other end of the connecting rod (303) is hinged to the outside of the moving column (304), one end of the moving column (304) is fixedly installed with a moving disk (305), the output end of the cylinder (306) is fixedly installed on the other side of the moving disk (305), a cross plate is fixedly installed on the side wall of the mounting cylinder (301), the moving disk (305) is slidably sleeved on the outside of the cross plate, a plurality of sliding holes are formed in the outside of the mounting cylinder (301), the clamping arm (302) is slidably installed in the corresponding sliding hole, the cylinder (306) is fixedly installed on one side of the mounting cylinder (301), the other side of the mounting cylinder (301) is fixedly connected to one end of a rotating shaft (307), a rotating motor (308) is fixedly installed on one side of the fixed plate (101), and the other end of the rotating shaft (307) is fixedly installed on the output shaft of the rotating motor (308).

7. The steel-plastic composite pipe sealing and forming device according to claim 6, wherein The support mechanism (2) includes: a third electric push rod (201), a lifting plate (202), and two connecting shafts (205). The third electric push rod (201) is fixedly installed on the top of the base (1), the lifting plate (202) is fixedly installed on the output end of the third electric push rod (201), cross beams (203) are fixedly installed on both the front and rear sides of the lifting plate (202), L-shaped plates (204) are fixedly installed at both ends of the cross beam (203), the connecting shaft (205) is rotatably installed in the corresponding L-shaped plate (204), support wheels (206) are fixedly installed at both ends of the connecting shaft (205), a vertical rod (207) is slidably installed in the L-shaped plate (204), and the bottom end of the vertical rod (207) is fixedly connected to the base (1).

8. The steel-plastic composite pipe sealing and forming device according to claim 7, wherein A controller (8) is fixedly installed on the top of the base (1), and the temperature sensor (716), the second pressure sensor (701), and the semiconductor refrigeration ring (710) are in signal connection with the controller (8).

9. A method for sealing and forming a steel-plastic composite pipe, which is applied to the steel-plastic composite pipe sealing and forming device described in claim 8, and is characterized in that, It includes the following steps: S1: Sleeve the steel-plastic composite pipe on the outside of the fixed cylinder, start the cylinder (306) to drive the moving column (304) to move leftward. The moving column (304) drives a plurality of clamping arms (302) to move away from each other through a plurality of connecting rods (303), so that the plurality of clamping arms (302) abut against the inner wall of the steel-plastic composite pipe to achieve clamping and fixing. Start the third electric push rod (201) to drive the lifting plate (202) to move upward, thereby driving the four support wheels (206) to move upward, so that the support wheels (206) abut against the bottom of the steel-plastic composite pipe to achieve support. Then start the rotating motor (308) to drive the rotating shaft (307) and the fixture (3) to rotate slowly, thereby driving the steel-plastic composite pipe to rotate; S2: Start the grinding motor (409) and the second electric push rod (401). The grinding motor (409) drives the drive column (408) to rotate through the meshing of the driving gear (411) and the driven gear (412). The drive column (408) drives the horizontal shaft (410) to rotate synchronously through the sliding fit between the hexagonal hole and the hexagonal prism (407). The horizontal shaft (410) drives the vertical shaft (403) and the grinding wheel (404) to rotate at high speed through the meshing of the driving bevel gear (406) and the driven bevel gear (405). The second electric push rod (401) drives the bracket (402) and the grinding wheel (404) to move horizontally, so that the grinding wheel (404) grinds the steel-plastic composite pipe when it rotates. After grinding, control the second electric push rod (401) to drive the bracket (402) to reset, and then control the grinding motor (409) to stop running; S3: Start the first electric push rod (509) to drive the extrusion barrel (501) to move towards the side close to the steel-plastic composite pipe. After the preheating plate (606) and the flattening roller (705) come into contact with the steel-plastic composite pipe, continue to control the horizontal movement of the extrusion barrel (501), and compress the compression spring (703) and the connecting spring (604). When the pressure values sensed by the first pressure sensor (601) and the second pressure sensor (701) reach the preset value, control the first electric push rod (509) to stop running. Then start the preheating plate (606) and the extrusion motor (504). The preheating plate (606) preheats the steel-plastic composite pipe by contacting its end face. At the same time, the extrusion motor (504) drives the spiral auger (503) to convey the plastic introduced into the feed pipe (505) to the right, heats the plastic through the heating barrel (507) to turn it into a molten state, then extrudes it through the square-hole extrusion nozzle and coats it on the port of the steel-plastic composite pipe to form a thin plastic covering. Then, the thin plastic covering is flattened by the extrusion of the flattening roller (705). At the same time, the flattening roller (705) rotates and drives the rotating arm (713) to rotate. The rotating arm (713) drives the two piston plates (715) to reciprocate through the cooperation with the linkage rod, and under the cooperation of the first one-way valve (711) and the second one-way valve (712), air enters the compression box (706) through the air inlet pipe (708) and then is sprayed onto the thin plastic covering through the air jet pipe (707) to accelerate its cooling. By starting the semiconductor refrigeration ring (710) to refrigerate the air inlet pipe (708), the air inlet pipe (708) and the air inside it are cooled. The temperature of the thin plastic covering is monitored by the temperature sensor (716). When the temperature is monitored to rise, the power of the semiconductor refrigeration ring (710) is controlled to increase to enhance the cooling effect, thereby enhancing the cooling and forming effect of the thin plastic covering. When the first pressure sensor (601) monitors an increase in pressure, it indicates that a complete circle of the thin plastic covering is about to be completed. At this time, the controller (8) controls the preheating plate (606) to stop heating, and the extrusion motor (504) continues to run, so as to continue spraying plastic on the surface of the steel-plastic composite pipe to form a thin-wall covering, and flatten it through the flattening roller (705) and cool it by jetting air through the air jet pipe (707). During this period, the pressure value is continuously monitored by the second pressure sensor (701) and the signal is transmitted to the controller (8). When the pressure value monitored by the second pressure sensor (701) slowly rises, the controller (8) determines that the work is normal. When the pressure value monitored by the second pressure sensor (701) undergoes a drastic change, the controller (8) determines that an abnormal situation has occurred, and stops the rotation of the rotary motor (308) and the extrusion motor (504) to conduct problem troubleshooting. When the pressure value monitored by the second pressure sensor (701) reaches the set value, control the extrusion motor (504) and the rotary motor (308) to stop running, and control the first electric push rod (509) to drive the extrusion barrel (501) to horizontally move back to its original position; S4: Control the rotary motor (308) to stop running, start the cylinder (306) to drive the moving column (304) to move in the reverse direction, release the clamping of the steel-plastic composite pipe, thereby completing the sealing work.

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