Steel-plastic composite pipe forming machine and forming method

Abstract

The invention relates to the technical field of steel-plastic composite pipe machining, and discloses a steel-plastic composite pipe forming machine and a forming method.The steel-plastic composite pipe forming machine comprises an extrusion mechanism, a cooling mechanism, a cutting mechanism and a forming mechanism, and the cutting mechanism comprises a fixed disc, a rotating disc and a mounting plate; a cutting motor is fixedly mounted on the mounting plate, a cutting disc is fixedly mounted at the output end of the cutting motor, a connecting column is fixedly mounted at the other end of the mounting plate, and a guide groove is formed in one side of the fixing disc. The device is reasonable in design, plastic waste can be used as a raw material to manufacture a plastic pipe blank through cooperation of the arranged basic mechanism and the cooling mechanism, the cost is reduced, the environmental protection property is improved, automatic cutting can be achieved through the arranged cutting mechanism in the basic process, and normal extrusion work is not affected; and the heating amount and the feeding speed can be automatically adjusted according to the resistance of the plastic pipe blank through the arranged forming mechanism, and the quality of the formed steel-plastic composite pipe is guaranteed.

Description

Technical Field

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

[0002] With the continuous development of modern industry and the increasing performance requirements for piping systems, steel-plastic composite pipes, a new type of pipe that combines the strength of metal steel pipes with the excellent corrosion resistance and lightness of plastic pipes, have been widely used in many fields. For example, steel-plastic composite pipes play an important role in water supply and drainage systems and heating systems in the construction industry, as well as fluid transportation systems in the petroleum, chemical, and power industries.

[0003] Traditional methods for forming steel-plastic composite pipes often have limitations. Early methods used simple, crude methods to bond the plastic to the steel pipe, such as gluing. This method not only suffers from low bond strength and the tendency for the plastic layer to peel off during use, but the glue itself can also contaminate the transported media, compromising safety. Furthermore, this bonding process struggles to ensure uniform adhesion between the plastic layer and the steel pipe, leading to localized stress concentrations and reduced overall pipe quality and service life.

[0004] Some molding methods involve manufacturing the plastic and steel pipes separately and then assembling them. However, during the assembly process, the dimensional accuracy of the plastic and steel pipes is difficult to precisely control, which can lead to gaps or interference fits between the two. Excessive gaps can easily cause leakage of liquids or gases during transportation, while interference fits can increase assembly complexity and even damage the pipes. This can also shorten the pipe's service life due to stress concentration.

[0005] In the plastic pipe molding process, previous equipment often had limited functionality, failing to effectively achieve key process steps such as uniform plasticization, precise extrusion, and rapid cooling and shaping of the plastic raw material. For example, some extruders lacked precise control over heating and extrusion speed, resulting in unstable plastic melt quality, which in turn affected the molding quality of the plastic pipe blank, causing uneven wall thickness and high surface roughness. Furthermore, cooling and shaping devices typically used simple air or water cooling, resulting in uneven cooling and easily causing deformation and internal stress in the plastic pipe blank.

[0006] When assembling plastic tubes onto steel pipes, traditional equipment often lacks automation and precise positioning control systems. Excessive manual labor not only reduces production efficiency but also makes it difficult to ensure assembly precision and consistent quality across each pipe. For example, when inserting the plastic tube into the steel pipe, problems such as eccentricity and tilt are prone to occur, impacting the performance and appearance of the steel-plastic composite pipe. Therefore, we propose a steel-plastic composite pipe forming machine and forming method to address this issue. Summary of the Invention

[0007] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology and to propose a steel-plastic composite pipe forming machine and forming method.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A steel-plastic composite pipe forming machine includes: an extrusion mechanism, a cooling mechanism, a cutting mechanism, and a forming mechanism. The cutting mechanism includes: a fixed disk, a rotating disk, and a mounting plate. A cutting motor is fixedly mounted on the mounting plate, and a cutting disk is fixedly mounted on the output end of the cutting motor. A connecting column is fixedly mounted on the other end of the mounting plate. A guide groove is formed on one side of the fixed disk, and the connecting column is movably inserted into the guide groove.

[0010] The forming mechanism includes: a fixed seat, a movable seat, an electromagnetic heater, a pulling mechanism and a positioning mechanism, the movable seat is slidably mounted on the top of the fixed seat, a protective cover is fixedly mounted on the outside of the electromagnetic heater, and the protective cover is fixedly mounted on the top of the movable seat, the pulling mechanism includes: a driving motor, a square plate, a driving disk and a plurality of clamping claws, one end of the square plate is fixedly mounted on a fixed column, the clamping claw is hinged to a side close to the fixed column with a plurality of linkage rods parallel to each other, the other end of the linkage rod is hinged to the outside of the fixed column, one side of the driving disk is hinged with a plurality of connecting rods, the other end of the connecting rod is hinged to the corresponding linkage rod, a rack is fixedly mounted on the bottom of the square plate, a transmission gear is fixedly mounted on the output shaft of the driving motor, the transmission gear and the rack are meshed with each other, a base is fixedly mounted on one side of the driving motor, a pressure sensor is fixedly mounted on one side of the base, a controller is provided on the top of the fixed seat, and the controller is connected to the pressure sensor and the electromagnetic heater signal.

[0011] Preferably, the extrusion mechanism includes: an extrusion barrel, an extrusion die, a heating ring and a spiral auger, an extrusion motor is fixedly installed on one side of the extrusion barrel, the spiral auger is fixedly installed on the output shaft of the extrusion motor, the extrusion die is fixedly installed on the other end of the extrusion barrel, the top of the extrusion barrel is connected to the feed hopper, the heating ring is fixedly sleeved on the outside of the extrusion barrel, the outside of the heating ring is fixedly sleeved with a heat insulation cover, and the bottom of the extrusion barrel is fixedly installed with a support seat.

[0012] Preferably, the cooling mechanism includes: a cooling box, a fixed ring tube, a rotating ring tube and a rotating motor, circular holes are opened on both sides of the cooling box, the fixed ring tube is fixedly installed in the cooling box, the rotating ring tube is rotatably installed in the fixed ring tube, one side of the rotating ring tube is connected to a plurality of spray cylinders, the inner side of the spray cylinder is connected to a plurality of nozzles, the outer side of the rotating ring tube is fixedly installed with an outer gear ring, the rotating motor is fixedly installed on one side of the cooling box, a driving gear is fixedly installed on the output shaft of the rotating motor, the driving gear and the outer gear ring are meshed with each other, a circulating pump is fixedly installed on the inner bottom of the cooling box, a conduit is connected between the water outlet of the circulating pump and the fixed ring tube, and the front side of the cooling box is connected with a drain pipe and a water supply pipe.

[0013] Preferably, the cutting mechanism also includes: a first electric push rod and a servo motor, the first electric push rod is fixedly mounted on the other side of the cooling box, the output end of the first electric push rod is fixedly connected to the fixed disk, the rotating disk is rotatably mounted in the fixed disk, a driving rod is rotatably mounted on one side of the rotating disk, the servo motor is fixedly mounted on the outside of the fixed disk, a rotating frame is fixedly mounted on the output shaft of the servo motor, the rotating frame is slidably sleeved on the outside of the driving rod, a plurality of sliding holes are opened on the outside of the rotating disk, the mounting plate is slidably mounted in the corresponding sliding holes, and the guide groove includes: an arc segment and an inclined segment that are connected to each other.

[0014] Preferably, the guiding mechanism comprises: a guiding frame, two annular shafts and a plurality of positioning wheels, the annular shafts are fixedly mounted in the guiding frame, and the positioning wheels are rotatably mounted on the outsides of the corresponding annular shafts.

[0015] Preferably, a square hole is provided on one side of the movable seat, the square plate is slidably installed in the square hole, a guide plate is slidably installed inside the base, the guide plate and the pressure sensor are both fixedly installed on one side of the movable seat, the top of the fixed seat is fixedly installed with a first motor and a fixed rail, the movable seat is slidably sleeved on the outside of the fixed rail, a screw rod is fixedly installed on the output shaft of the first motor, the movable seat is threadedly sleeved on the outside of the screw rod, two cross bars are fixedly installed on one side of the driving disk, the cross bars are slidably installed in the square plate, the other ends of the two cross bars are fixedly installed with the same push plate, the other end of the square plate is fixedly installed with a second electric push rod, and the output shaft of the second electric push rod is fixedly connected to the push plate.

[0016] Preferably, the positioning mechanism includes: a positioning motor, a bidirectional screw and two cross plates, the positioning motor is fixedly mounted on the top of the movable seat, the bidirectional screw is fixedly mounted on the output shaft of the positioning motor, the two cross plates are threadedly sleeved on the outside of the bidirectional screw, positioning frames are fixedly mounted on both ends of the cross plates, guide rails are fixedly mounted on both sides of the top of the movable seat, the positioning frame is slidably sleeved on the outside of the guide rails, a steel pipe is provided through the inner side of the electromagnetic heater, and the positioning frame is movably abutted against the outside of the steel pipe.

[0017] The present invention also provides a steel-plastic composite pipe forming method, which is applied to the above-mentioned steel-plastic composite pipe forming machine and comprises the following steps:

[0018] S1: The collected plastic waste is crushed, cleaned, filtered, dried, and then added to the feed hopper of the plastic extruder. Driven by the extrusion motor, the auger rotates at a certain speed to push the plastic particles forward. The heating ring heats the extruder barrel, causing the plastic particles to gradually melt into a uniform plastic melt in the extruder. The plastic melt is extruded through the extrusion die to form a plastic tube blank that matches the inner diameter of the steel pipe.

[0019] S2: The extruded plastic tube enters the cooling box, and the circulation pump and the rotating motor circulation pump are started to guide the water in the cooling box into the fixed ring tube. There are connecting holes in the fixed ring tube and the rotating ring tube, allowing water to enter the rotating ring tube and be sprayed out through multiple nozzles on the spray barrel to cool the plastic tube. The rotating motor drives the driving gear to rotate, and the driving gear drives the rotating ring tube to rotate by meshing with the outer gear ring, thereby driving the multiple spray barrels to perform circular motion, achieving all-round spray cooling of the plastic tube.

[0020] S3. Start the servo motor and the cutting motor. The cutting motor drives the cutting disc to rotate. The servo motor drives the rotating frame to rotate. The rotating frame drives the rotating disc to rotate by cooperating with the driving rod. The rotating disc drives the mounting plate to perform circular motion. The mounting plate drives the connecting column to move synchronously. The connecting column first moves toward the axis of the rotating disc under the guidance of the guide groove, and then performs circular motion around the axis of the rotating disc. After the mounting plate drives the cutting disc to approach the plastic tube blank, it performs circular motion around the plastic tube blank, thereby achieving rapid circular cutting. During the cutting process, the fixed disc is driven to move horizontally by the first electric push rod and matches the basic forming speed of the plastic tube blank, thereby ensuring continuous and stable extrusion.

[0021] S4. The cut plastic tube blank is sleeved on the outer sides of the multiple clamping claws under the guidance of the multiple positioning wheels. The second electric push rod is started to drive the cross bar and the driving disc to move to the left. The driving disc drives the multiple linkage rods to rotate through the connecting rod, and causes the clamping claw to move to the side away from the fixed column, thereby abutting against the inner side of the plastic tube blank. Then the driving motor is started to drive the transmission gear to rotate. The transmission gear drives the square plate to move horizontally by engaging with the rack, thereby pulling the plastic tube blank into the interior of the steel pipe. The resistance encountered by the plastic tube blank during the process of entering the steel pipe is monitored by the pressure sensor. When the resistance is detected to increase, the controller controls the speed of the driving motor to decrease and controls the electromagnetic heater to start, thereby heating the steel pipe, so that the outer layer of the plastic tube blank in contact with the inner wall of the steel pipe is melted by the heat, thereby reducing the movement resistance.

[0022] S5. After the plastic pipe has completely entered the steel pipe, the first motor is started to drive the screw to rotate. The screw drives the movable seat to move back and forth by cooperating with the thread of the movable seat. Then the positioning motor is started to drive the bidirectional screw to rotate, thereby driving the two positioning frames to move to the side away from the steel pipe, so as to facilitate the removal of the formed steel-plastic composite pipe. After the steel-plastic composite pipe is naturally cooled, the outer wall of the plastic pipe is condensed and tightly combined with the steel pipe.

[0023] Compared with the prior art, the present invention provides a steel-plastic composite pipe forming machine and forming method, which have the following beneficial effects:

[0024] (1) Collect various plastic wastes as raw materials and use them for production after pre-treatment such as crushing, cleaning, filtering and drying. This not only effectively reduces the pollution of plastic waste to the environment and realizes the recycling of resources, but also reduces production costs, which is in line with the concept of sustainable development. At the same time, in the entire production process, reasonable process design and equipment coordination make energy consumption relatively low. For example, in the extrusion and cooling links, through precise temperature control and efficient heat exchange mechanism, unnecessary energy loss is reduced, energy utilization efficiency is improved, and it helps enterprises reduce energy consumption costs and environmental impact;

[0025] (2) The plastic particles are heated by the heating ring and pushed by the spiral auger in the extruder, gradually melting to form a uniform plastic melt, and then extruded through the extrusion die to form a plastic tube blank that matches the inner diameter of the steel pipe. This extrusion process can ensure that the material of the plastic tube blank is uniform and the size is accurate, providing a good foundation for the subsequent compounding with the steel pipe, and helping to improve the overall quality and performance of the steel-plastic composite pipe. The extruded plastic tube blank enters the cooling box for cooling and molding. The circulating pump and the rotating motor drive the spray barrel to spray and cool in all directions, so that the plastic tube blank can be cooled quickly and evenly. The stable cooling process can ensure the shape and dimensional stability of the plastic tube blank, reduce problems such as deformation or internal stress concentration caused by uneven cooling, and thus improve the product qualification rate and reliability;

[0026] (3) Rapid circular cutting of the plastic tube blank is achieved by starting the servo motor and the cutting motor. During the cutting process, the fixed disk is driven horizontally by the first electric push rod and matched with the basic forming speed of the plastic tube blank, ensuring the continuous and smooth extrusion work. This precise cutting operation can ensure that the length of the plastic tube blank meets the requirements and the cut is smooth, which is conducive to the subsequent assembly with the steel pipe. At the same time, the efficient cutting speed also improves production efficiency and meets the needs of large-scale production;

[0027] (4) The cut plastic tube blank is guided by a plurality of positioning wheels and sleeved on the outside of the clamping claw. The coordinated action of the second electric push rod and the drive disc and other components enables the clamping claw to accurately abut against the inside of the plastic tube blank, and then pull the plastic tube blank into the inside of the steel pipe. The entire assembly process has a high degree of automation and is easy to operate. It can ensure the coaxiality and position accuracy of the plastic tube blank and the steel pipe, which is beneficial to improving the structural stability and performance of the steel-plastic composite pipe. In addition, the pressure sensor monitors the resistance and feedback controls the speed of the drive motor and the start of the electromagnetic heater to heat the steel pipe, thereby reducing the movement resistance between the plastic tube blank and the inner wall of the steel pipe, avoiding problems such as damage to the plastic tube blank or improper assembly due to excessive resistance, and further improving the reliability of assembly and product quality.

[0028] (5) When the plastic tube is completely inserted into the steel tube, the first motor and the positioning motor drive the screw and the bidirectional screw to rotate respectively, realizing the corresponding movement of the moving seat and the positioning frame, so as to facilitate the removal of the formed steel-plastic composite tube. This structural design allows the product to be easily removed from the equipment after forming, facilitating subsequent processing, testing and packaging, improving the smoothness and work efficiency of the entire production process, and also reducing the risk of damage to the product caused by the difficulty of removing the tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the three-dimensional structure of a steel-plastic composite pipe forming machine proposed by the present invention;

[0030] Figure 2 This is a schematic diagram of the overall cross-sectional structure of a steel-plastic composite pipe forming machine proposed by the present invention;

[0031] Figure 3 This is a schematic cross-sectional view of the extrusion mechanism proposed in the present invention;

[0032] Figure 4 This is a schematic cross-sectional view of the cooling mechanism and cutting mechanism proposed in the present invention;

[0033] Figure 5 for Figure 4 A partial enlarged view of part A;

[0034] Figure 6This is a schematic cross-sectional view of the molding mechanism proposed in the present invention;

[0035] Figure 7 for Figure 6 A partial enlarged view of part B;

[0036] Figure 8 This is a schematic diagram of the three-dimensional structure of the extrusion mechanism proposed in the present invention;

[0037] Figure 9 A schematic diagram of a partial three-dimensional structure of the cooling mechanism proposed in the present invention;

[0038] Figure 10 This is a schematic diagram of the three-dimensional structure of the cutting mechanism proposed in the present invention;

[0039] Figure 11 A side view of the cutting mechanism proposed by the present invention;

[0040] Figure 12 This is a schematic diagram of the three-dimensional structure of the guiding mechanism proposed in the present invention;

[0041] Figure 13 This is a schematic diagram of the three-dimensional structure of the forming mechanism proposed in the present invention;

[0042] Figure 14 This is a schematic diagram of the three-dimensional structure of the pulling mechanism proposed in the present invention;

[0043] Figure 15 for Figure 14 A partial enlarged view of the

[0044] Figure 16 This is a schematic diagram of a partial three-dimensional structure of the pulling mechanism proposed in the present invention;

[0045] Figure 17 This is a schematic diagram of the partial cross-sectional structure of the pulling mechanism proposed in the present invention.

[0046] In the figure: 1. Extrusion mechanism; 101. Extrusion barrel; 102. Extrusion motor; 103. Screw auger; 104. Feed hopper; 105. Heating ring; 106. Heat shield; 107. Extrusion die head; 108. Support seat; 2. Cooling mechanism; 201. Cooling box; 202. Fixed ring tube; 203. Rotating ring tube; 204. Spray barrel; 205. Nozzle; 206. Circulation pump; 207. Outer gear ring; 208. Driving gear; 209. Rotating motor; 3. Cutting mechanism; 301. Fixed disk; 302. Rotating disk; 303. Mounting plate; 304. Cutting motor; 305. Cutting disk; 306. Connecting column; 307. Guide groove; 308. First electric push rod; 309. Servo motor; 310. Rotating frame; 311. Driving rod; 4. Guide mechanism ;401, guide frame; 402, annular shaft; 403, positioning wheel; 5, forming mechanism; 501, fixed seat; 502, fixed rail; 503, movable seat; 504, screw rod; 505, first motor; 506, protective cover; 507, electromagnetic heater; 6, positioning mechanism; 601, positioning motor; 602, bidirectional screw; 603, cross plate; 604, positioning frame; 605, guide rail; 7, pulling mechanism; 701, square plate; 702, fixed column; 703, clamping claw; 704, linkage rod; 705, connecting rod; 706, driving disk; 707, rack; 708, transmission gear; 709, driving motor; 710, base; 711, pressure sensor; 712, guide plate; 713, cross bar; 714, push plate; 715, second electric push rod. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0048] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0049] Reference Figure 1-17A steel-plastic composite pipe forming machine includes: an extrusion mechanism 1, a cooling mechanism 2, a cutting mechanism 3 and a forming mechanism 5. The cutting mechanism 3 includes: a fixed disk 301, a rotating disk 302 and a mounting plate 303. A cutting motor 304 is fixedly mounted on the mounting plate 303. A cutting disk 305 is fixedly mounted on the output end of the cutting motor 304. A connecting column 306 is fixedly mounted on the other end of the mounting plate 303. A guide groove 307 is opened on one side of the fixed disk 301. The connecting column 306 is movably inserted into the guide groove 307.

[0050] The forming mechanism 5 includes: a fixed seat 501, a movable seat 503, an electromagnetic heater 507, a pulling mechanism 7 and a positioning mechanism 6. The movable seat 503 is slidably mounted on the top of the fixed seat 501. A protective cover 506 is fixedly mounted on the outside of the electromagnetic heater 507. The protective cover 506 is fixedly mounted on the top of the movable seat 503. The pulling mechanism 7 includes: a driving motor 709, a square plate 701, a driving disk 706 and a plurality of clamping claws 703. A fixed column 702 is fixedly mounted on one end of the square plate 701. A plurality of mutually parallel linkage rods 704 are hinged on the side of the clamping claw 703 close to the fixed column 702. The linkage rods 704 The other end is hinged to the outside of the fixed column 702, and a plurality of connecting rods 705 are hinged on one side of the driving disk 706. The other end of the connecting rod 705 is hinged to the corresponding linkage rod 704. A rack 707 is fixedly installed on the bottom of the square plate 701, and a transmission gear 708 is fixedly installed on the output shaft of the driving motor 709. The transmission gear 708 and the rack 707 are engaged with each other. A base 710 is fixedly installed on one side of the driving motor 709, and a pressure sensor 711 is fixedly installed on one side of the base 710. A controller is provided on the top of the fixed base 501, and the controller is connected to the pressure sensor 711 and the electromagnetic heater 507 signals.

[0051] In this embodiment, the extrusion mechanism 1 includes: an extrusion barrel 101, an extrusion die 107, a heating ring 105 and a spiral auger 103. An extrusion motor 102 is fixedly installed on one side of the extrusion barrel 101, and the spiral auger 103 is fixedly installed on the output shaft of the extrusion motor 102. The extrusion die 107 is fixedly installed on the other end of the extrusion barrel 101. The top of the extrusion barrel 101 is connected to the feed hopper 104. The heating ring 105 is fixedly sleeved on the outside of the extrusion barrel 101. The outside of the heating ring 105 is fixedly sleeved with a heat insulation cover 106. The bottom of the extrusion barrel 101 is fixedly installed with a support seat 108.

[0052] In this embodiment, the cooling mechanism 2 includes: a cooling box 201, a fixed ring pipe 202, a rotating ring pipe 203 and a rotating motor 209. Circular holes are opened on both sides of the cooling box 201. The fixed ring pipe 202 is fixedly installed in the cooling box 201, and the rotating ring pipe 203 is rotatably installed in the fixed ring pipe 202. One side of the rotating ring pipe 203 is connected to multiple spray cylinders 204, and the inner side of the spray cylinder 204 is connected to multiple nozzles 205. An outer gear ring 207 is fixedly installed on the outer side of the rotating ring pipe 203, and the rotating motor 209 is fixedly installed on one side of the cooling box 201. A driving gear 208 is fixedly installed on the output shaft of the rotating motor 209, and the driving gear 208 and the outer gear ring 207 are meshed with each other. A circulating pump 206 is fixedly installed on the inner bottom of the cooling box 201, and a conduit is connected between the water outlet of the circulating pump 206 and the fixed ring pipe 202. The front side of the cooling box 201 is connected to a drain pipe and a water supply pipe.

[0053] In this embodiment, the cutting mechanism 3 also includes: a first electric push rod 308 and a servo motor 309. The first electric push rod 308 is fixedly installed on the other side of the cooling box 201. The output end of the first electric push rod 308 is fixedly connected to the fixed disk 301. The rotating disk 302 is rotatably installed in the fixed disk 301. A drive rod 311 is rotatably installed on one side of the rotating disk 302. The servo motor 309 is fixedly installed on the outside of the fixed disk 301. A rotating frame 310 is fixedly installed on the output shaft of the servo motor 309. The rotating frame 310 is slidably sleeved on the outside of the drive rod 311. A plurality of sliding holes are opened on the outside of the rotating disk 302. The mounting plate 303 is slidably installed in the corresponding sliding holes. The guide groove 307 includes: an arc segment and an inclined segment that are connected to each other.

[0054] In this embodiment, the guide mechanism 4 includes: a guide frame 401 , two annular shafts 402 and a plurality of positioning wheels 403 . The annular shafts 402 are fixedly mounted in the guide frame 401 , and the positioning wheels 403 are rotatably mounted on the outside of the corresponding annular shafts 402 .

[0055] In this embodiment, a square hole is opened on one side of the movable seat 503, and the square plate 701 is slidably installed in the square hole. A guide plate 712 is slidably installed inside the base 710, and the guide plate 712 and the pressure sensor 711 are both fixedly installed on one side of the movable seat 503. The top of the fixed seat 501 is fixedly installed with a first motor 505 and a fixed rail 502. The movable seat 503 is slidably sleeved on the outside of the fixed rail 502. A screw rod 504 is fixedly installed on the output shaft of the first motor 505, and the movable seat 503 is threadedly sleeved on the outside of the screw rod 504. Two cross bars 713 are fixedly installed on one side of the driving disk 706. The cross bars 713 are slidably installed in the square plate 701. The other ends of the two cross bars 713 are fixedly installed with the same push plate 714. The other end of the square plate 701 is fixedly installed with a second electric push rod 715, and the output shaft of the second electric push rod 715 is fixedly connected to the push plate 714.

[0056] In this embodiment, the positioning mechanism 6 includes: a positioning motor 601, a bidirectional screw 602 and two horizontal plates 603. The positioning motor 601 is fixedly mounted on the top of the movable seat 503. The bidirectional screw 602 is fixedly mounted on the output shaft of the positioning motor 601. The two horizontal plates 603 are both threadedly sleeved on the outside of the bidirectional screw 602. Positioning frames 604 are fixedly mounted on both ends of the horizontal plates 603. Guide rails 605 are fixedly mounted on both sides of the top of the movable seat 503. The positioning frame 604 is slidably sleeved on the outside of the guide rail 605. A steel pipe is provided through the inner side of the electromagnetic heater 507, and the positioning frame 604 is movably abutted against the outside of the steel pipe.

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

[0058] S1: The collected plastic waste is crushed, cleaned, filtered, dried, and then added to the feed hopper 104 of the plastic extrusion mechanism 1. The auger 103 rotates at a certain speed under the drive of the extrusion motor 102 to push the plastic particles forward. The heating ring 105 heats the extruder barrel, causing the plastic particles to gradually melt into a uniform plastic melt in the extruder. The plastic melt is extruded through the extrusion die 107 to form a plastic tube blank that matches the inner diameter of the steel pipe.

[0059] S2: The extruded plastic tube blank enters the cooling box 201, and the circulation pump 206 and the rotating motor 209 are started. The circulation pump 206 guides the water in the cooling box 201 into the fixed ring tube 202. There are connecting holes in the fixed ring tube 202 and the rotating ring tube 203, so that water enters the rotating ring tube 203 and is sprayed out through the multiple nozzles 205 on the spray barrel 204 to cool the plastic tube blank. The rotating motor 209 drives the driving gear 208 to rotate. The driving gear 208 drives the rotating ring tube 203 to rotate by meshing with the outer gear ring 207, thereby driving the multiple spray barrels 204 to perform circular motion, achieving all-round spray cooling of the plastic tube blank;

[0060] S3, start the servo motor 309 and the cutting motor 304, the cutting motor 304 drives the cutting disc 305 to rotate, the servo motor 309 drives the rotating frame 310 to rotate, the rotating frame 310 drives the rotating disc 302 to rotate by cooperating with the driving rod 311, the rotating disc 302 drives the mounting plate 303 to perform a circular motion, the mounting plate 303 drives the connecting column 306 to move synchronously, the connecting column 306 first moves toward the axis of the rotating disc 302 under the guidance of the guide groove 307, and then performs a circular motion around the axis of the rotating disc 302, the mounting plate 303 drives the cutting disc 305 to approach the plastic tube blank, and then performs a circular motion around the plastic tube blank, thereby achieving rapid circular cutting, during the cutting process, the fixed disc 301 is driven to move horizontally by the first electric push rod 308 and matches the basic molding speed of the plastic tube blank, thereby ensuring continuous and stable extrusion work;

[0061] S4. The cut plastic tube blank is sleeved on the outer side of the plurality of clamping claws 703 under the guidance of the plurality of positioning wheels 403. The second electric push rod 715 is started to drive the cross bar 713 and the driving disk 706 to move to the left. The driving disk 706 drives the plurality of linkage rods 704 to rotate through the connecting rod 705, and causes the clamping claw 703 to move to the side away from the fixed column 702, thereby abutting against the inner side of the plastic tube blank. Then the driving motor 709 is started to drive the transmission gear 708 to rotate. The transmission gear 708 drives the square plate 701 to move horizontally by engaging with the rack 707, thereby pulling the plastic tube blank into the interior of the steel pipe. The resistance encountered by the plastic tube blank during the process of entering the steel pipe is monitored by the pressure sensor 711. When the resistance is detected to increase, the controller controls the speed of the driving motor 709 to decrease and controls the electromagnetic heater 507 to start, thereby heating the steel pipe, so that the outer layer of the plastic tube blank in contact with the inner wall of the steel pipe is melted by the heat, thereby reducing the movement resistance.

[0062] S5. After the plastic pipe has completely entered the steel pipe, the first motor 505 is started to drive the screw 504 to rotate. The screw 504 drives the movable seat 503 to move back and forth by cooperating with the thread of the movable seat 503. Then the positioning motor 601 is started to drive the bidirectional screw 602 to rotate, thereby driving the two positioning frames 604 to move to the side away from the steel pipe, so as to facilitate the removal of the formed steel-plastic composite pipe. After the steel-plastic composite pipe is naturally cooled, the outer wall of the plastic pipe is condensed and tightly combined with the steel pipe.

[0063] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

Claims

1. A steel-plastic composite pipe forming machine, characterized in that: include: An extrusion mechanism (1), a cooling mechanism (2), a cutting mechanism (3) and a forming mechanism (5), wherein the cutting mechanism (3) comprises: a fixed disk (301), a rotating disk (302) and a mounting plate (303); a cutting motor (304) is fixedly mounted on the mounting plate (303); a cutting disk (305) is fixedly mounted on the output end of the cutting motor (304); a connecting column (306) is fixedly mounted on the other end of the mounting plate (303); a guide groove (307) is provided on one side of the fixed disk (301); and the connecting column (306) is movably inserted into the guide groove (307); The forming mechanism (5) comprises: a fixed seat (501), a movable seat (503), an electromagnetic heater (507), a pulling mechanism (7) and a positioning mechanism (6); the movable seat (503) is slidably mounted on the top of the fixed seat (501); a protective cover (506) is fixedly mounted on the outer side of the electromagnetic heater (507); the protective cover (506) is fixedly mounted on the top of the movable seat (503); the pulling mechanism (7) comprises: a driving motor (709), a square plate (701), a driving disc (706) and a plurality of clamping claws (703); a fixed column (702) is fixedly mounted on one end of the square plate (701); a plurality of mutually parallel linkage rods (704) are hinged on one side of the clamping claw (703) close to the fixed column (702); the linkage rods ( The other end of the drive plate (704) is hinged to the outside of the fixed column (702), a plurality of connecting rods (705) are hinged on one side of the drive disc (706), and the other end of the connecting rod (705) is hinged to the corresponding linkage rod (704), a rack (707) is fixedly installed on the bottom of the square plate (701), a transmission gear (708) is fixedly installed on the output shaft of the drive motor (709), and the transmission gear (708) and the rack (707) are meshed with each other, a base (710) is fixedly installed on one side of the drive motor (709), and a pressure sensor (711) is fixedly installed on one side of the base (710), and a controller is provided on the top of the fixed seat (501), and the controller is connected to the pressure sensor (711) and the electromagnetic heater (507) for signal.

2. The steel-plastic composite pipe forming machine according to claim 1, characterized in that: The extrusion mechanism (1) comprises: an extrusion barrel (101), an extrusion die head (107), a heating ring (105) and a spiral auger (103); an extrusion motor (102) is fixedly mounted on one side of the extrusion barrel (101); the spiral auger (103) is fixedly mounted on the output shaft of the extrusion motor (102); the extrusion die head (107) is fixedly mounted on the other end of the extrusion barrel (101); the top of the extrusion barrel (101) is connected to a feed hopper (104); the heating ring (105) is fixedly sleeved on the outside of the extrusion barrel (101); a heat insulation cover (106) is fixedly sleeved on the outside of the heating ring (105); and a support seat (108) is fixedly mounted on the bottom of the extrusion barrel (101).

3. The steel-plastic composite pipe forming machine according to claim 2, characterized in that: The cooling mechanism (2) comprises: a cooling box (201), a fixed annular tube (202), a rotating annular tube (203) and a rotating motor (209); circular holes are provided on both sides of the cooling box (201); the fixed annular tube (202) is fixedly installed in the cooling box (201); the rotating annular tube (203) is rotatably installed in the fixed annular tube (202); one side of the rotating annular tube (203) is connected to a plurality of spray cylinders (204); the inner side of the spray cylinder (204) is connected to a plurality of nozzles (205); the rotating annular tube (203) is connected to the inner side of the spray cylinder (204); 3) is fixedly mounted on the outside of an outer gear ring (207), the rotating motor (209) is fixedly mounted on one side of the cooling box (201), a driving gear (208) is fixedly mounted on the output shaft of the rotating motor (209), the driving gear (208) and the outer gear ring (207) are meshed with each other, a circulating pump (206) is fixedly mounted on the bottom inside the cooling box (201), a conduit is connected between the water outlet of the circulating pump (206) and the fixed ring pipe (202), and a drain pipe and a water supply pipe are connected to the front side of the cooling box (201).

4. The steel-plastic composite pipe forming machine according to claim 3, characterized in that: The cutting mechanism (3) further comprises: a first electric push rod (308) and a servo motor (309); the first electric push rod (308) is fixedly mounted on the other side of the cooling box (201); the output end of the first electric push rod (308) is fixedly connected to the fixed disk (301); the rotating disk (302) is rotatably mounted in the fixed disk (301); a driving rod (311) is rotatably mounted on one side of the rotating disk (302); the servo motor (309) is fixedly mounted on the outside of the fixed disk (301); a rotating frame (310) is fixedly mounted on the output shaft of the servo motor (309); the rotating frame (310) is slidably sleeved on the outside of the driving rod (311); a plurality of sliding holes are provided on the outside of the rotating disk (302); the mounting plate (303) is slidably mounted in the corresponding sliding holes; and the guide groove (307) comprises: an arc segment and an inclined segment that are interconnected.

5. The steel-plastic composite pipe forming machine according to claim 4, characterized in that: The guide mechanism (4) comprises: a guide frame (401), two annular shafts (402) and a plurality of positioning wheels (403); the annular shafts (402) are fixedly mounted in the guide frame (401); and the positioning wheels (403) are rotatably mounted on the outsides of the corresponding annular shafts (402).

6. The steel-plastic composite pipe forming machine according to claim 5, characterized in that: A square hole is provided on one side of the movable seat (503), the square plate (701) is slidably mounted in the square hole, a guide plate (712) is slidably mounted inside the base (710), the guide plate (712) and the pressure sensor (711) are both fixedly mounted on one side of the movable seat (503), a first motor (505) and a fixed rail (502) are fixedly mounted on the top of the fixed seat (501), the movable seat (503) is slidably sleeved on the outside of the fixed rail (502), and the output of the first motor (505) is A screw rod (504) is fixedly mounted on the shaft, the movable seat (503) is threadedly sleeved on the outside of the screw rod (504), two cross bars (713) are fixedly mounted on one side of the driving disc (706), the cross bars (713) are slidably mounted in the square plate (701), the other ends of the two cross bars (713) are fixedly mounted with the same push plate (714), the other end of the square plate (701) is fixedly mounted with a second electric push rod (715), and the output shaft of the second electric push rod (715) is fixedly connected to the push plate (714).

7. The steel-plastic composite pipe forming machine according to claim 6, characterized in that: The positioning mechanism (6) comprises: a positioning motor (601), a bidirectional screw (602) and two transverse plates (603); the positioning motor (601) is fixedly mounted on the top of the movable seat (503); the bidirectional screw (602) is fixedly mounted on the output shaft of the positioning motor (601); the two transverse plates (603) are both threadedly sleeved on the outside of the bidirectional screw (602); positioning frames (604) are fixedly mounted on both ends of the transverse plates (603); guide rails (605) are fixedly mounted on both sides of the top of the movable seat (503); the positioning frames (604) are slidably sleeved on the outside of the guide rails (605); a steel pipe is provided through the inner side of the electromagnetic heater (507); the positioning frames (604) are movably abutted against the outer side of the steel pipe.

8. A method for forming a steel-plastic composite pipe, applied to the steel-plastic composite pipe forming machine as claimed in claim 7, characterized in that: The following steps are involved: S1: The collected various plastic wastes are crushed, cleaned, filtered, dried, and then added to the feed hopper (104) of the plastic extrusion mechanism (1). The spiral auger (103) rotates at a certain speed under the drive of the extrusion motor (102) to push the plastic particles forward. The heating ring (105) heats the extruder barrel so that the plastic particles gradually melt into a uniform plastic melt in the extruder. The plastic melt is extruded through the extrusion die (107) to form a plastic tube blank that matches the inner diameter of the steel pipe. S2: The extruded plastic tube blank enters the cooling box (201), and the circulating pump (206) and the rotating motor (209) are started. The circulating pump (206) guides the water in the cooling box (201) into the fixed ring tube (202). There are communicating holes in the fixed ring tube (202) and the rotating ring tube (203), so that water enters the rotating ring tube (203) and is sprayed out through the multiple nozzles (205) on the spray barrel (204), cooling and forming the plastic tube blank. The rotating motor (209) drives the driving gear (208) to rotate. The driving gear (208) drives the rotating ring tube (203) to rotate by meshing with the outer gear ring (207), thereby driving the multiple spray barrels (204) to perform circular motion, thereby achieving all-round spray cooling of the plastic tube blank. S3, start the servo motor (309) and the cutting motor (304), the cutting motor (304) drives the cutting disc (305) to rotate, the servo motor (309) drives the rotating frame (310) to rotate, the rotating frame (310) drives the rotating disc (302) to rotate by cooperating with the driving rod (311), the rotating disc (302) drives the mounting plate (303) to perform circular motion, the mounting plate (303) drives the connecting column (306) to move synchronously, and the connecting column (306) is in the guide groove (3 07), first moves toward the axis of the rotating disk (302), and then performs a circular motion around the axis of the rotating disk (302). After the mounting plate (303) drives the cutting disk (305) to approach the plastic tube blank, it performs a circular motion around the plastic tube blank, thereby achieving rapid circular cutting. During the cutting process, the fixed disk (301) is driven by the first electric push rod (308) to move horizontally and match the basic molding speed of the plastic tube blank, thereby ensuring continuous and stable extrusion. S4. The cut plastic tube blank is sleeved on the outside of the plurality of clamping claws (703) under the guidance of the plurality of positioning wheels (403). The second electric push rod (715) is started to drive the cross bar (713) and the driving disc (706) to move to the left. The driving disc (706) drives the plurality of linkage rods (704) to rotate through the connecting rod (705), and causes the clamping claw (703) to move to the side away from the fixed column (702), thereby contacting the inner side of the plastic tube blank. Then, the driving motor (709) is started to drive the transmission gear (708) ) rotates, and the transmission gear (708) drives the square plate (701) to move horizontally by meshing with the rack (707), thereby pulling the plastic tube blank into the interior of the steel pipe. The resistance encountered by the plastic tube blank during the process of entering the steel pipe is monitored by the pressure sensor (711). When the resistance is detected to be increasing, the controller controls the speed of the drive motor (709) to decrease and controls the electromagnetic heater (507) to start, thereby heating the steel pipe, so that the outer layer of the plastic tube blank in contact with the inner wall of the steel pipe is heated and melted, thereby reducing the movement resistance; S5. After the plastic tube has completely entered the steel tube, the first motor (505) is started to drive the screw rod (504) to rotate. The screw rod (504) drives the movable seat (503) to move forward and backward by cooperating with the thread of the movable seat (503). Then, the positioning motor (601) is started to drive the bidirectional screw rod (602) to rotate, thereby driving the two positioning frames (604) to move to the side away from the steel tube, thereby facilitating the removal of the formed steel-plastic composite tube. The steel-plastic composite tube is allowed to cool naturally, so that the outer wall of the plastic tube is condensed and tightly combined with the steel tube.

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