Steel-plastic composite pipe self-melting material sealing method and forming equipment

Abstract

The invention discloses a steel-plastic composite pipe self-melting material sealing method and forming equipment, and relates to the technical field of steel-plastic composite pipe end sealing. Comprising a base, a guide rail device connected to the base through threads, a clamping mechanism connected to the guide rail device through threads, a first air cylinder or a first oil cylinder connected to the clamping mechanism through threads, and a second air cylinder or a second oil cylinder with a piston rod in threaded connection with the clamping mechanism. The mold mechanism is in threaded connection with the guide rail device; a piston rod of the third air cylinder or the third oil cylinder is in threaded connection with the mold mechanism; pipe plastic can be rapidly and evenly heated to be molten, the sealing defect can be avoided through the exhaust hole, the sealing quality is improved through the material sealing component, and the two ends are sealed at the same time through cooperation of the symmetrically-arranged mold mechanisms and the third air cylinder.

Description

Technical Field

[0001] The invention relates to the technical field of steel-plastic composite pipe end sealing, in particular to a self-melting material sealing method and molding equipment for a steel-plastic composite pipe. Background Art

[0002] When the continuously formed steel-plastic composite pipe is cut into a certain length, there is a phenomenon of steel wire leakage on the cut surface. In order to ensure the performance of the steel-plastic composite pipe, the cut surface must be sealed, which is called sealing the pipe end of the steel-plastic composite pipe in the industry, so as to seal the steel wire into the plastic layer.

[0003] At present, there are mainly the following sealing methods for the ends of steel-plastic composite pipes: 1. Injection molding and sealing the ends of the pipes through an injection molding machine; 2. Sealing by butt welding; 3. Preheating the prefabricated sealing ring and the end of the pipe at the same time, and welding the two into shape; 4. Using the inner and outer molds of the sealing machine to heat the end face of the pipe to form a warped curling edge, and then using the forming mold to seal the inner and outer wall plastics at the curling edge back to the end face of the pipe. This sealing method is only suitable for polyethylene plastic composite pipes wrapped with steel wire mesh, and cannot be applied to steel skeleton polyethylene plastic composite pipes due to the rigidity of the pipe.

[0004] The first sealing method is gradually replaced by other methods due to the high investment and low efficiency of injection molding. However, the sealing effect of the pipe end is not good due to the presence of steel wire in the steel-plastic composite pipe, and the inner and outer weld curling edges at the sealing position of the pipe end must be cut after sealing. The method of preheating the prefabricated sealing ring and the pipe end at the same time and welding the two together has many processes. In addition to the sealing equipment, it is also necessary to introduce a prefabricated sealing ring mold and an injection molding machine, which increases the investment cost invisibly. The application of the sealing machine is limited by the rigidity of the pipe due to its molding mechanism. Because the rigidity of the steel skeleton in the steel skeleton polyethylene plastic composite pipe is relatively high, it is impossible to form enough inner and outer wall melts with curled end faces, so it cannot be applied to steel skeleton polyethylene plastic composite pipes.

[0005] In summary, it is urgent to develop a new type of steel skeleton steel-plastic composite pipe self-melting material sealing method and molding equipment that can heat, melt, and seal, and effectively control the overflow of the pipe during the sealing process. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a self-melting material sealing method and molding equipment for steel-plastic composite pipes, so as to solve the problems that the sealing machine in the prior art does not have the self-melting material sealing function for steel skeleton polyethylene plastic composite pipes.

[0007] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows: A self-melting sealing and forming device for steel-plastic composite pipes, comprising a base, a guide rail device threadedly connected to the base, a clamping mechanism threadedly connected to the guide rail device, a first air cylinder or a first oil cylinder threadedly connected to the clamping mechanism, a second air cylinder or a second oil cylinder threadedly connected to the clamping mechanism by a piston rod, a mold mechanism threadedly connected to the guide rail device, and a third air cylinder or a third oil cylinder threadedly connected to the mold mechanism by a piston rod; the mold mechanism is made of sintered copper, and the mold mechanism comprises a sealing component, a mold component fixedly connected to the sealing component, a heater fixedly connected to the mold component, a heater mounting plate threadedly connected to the sealing component, a heat insulating component clamped between the sealing component and the mold component and between the heater and the heater mounting plate, a pipe end sealing cavity arranged between the sealing components, and an exhaust hole arranged on the mold component; the mold mechanism is provided with a sleeve, which is located on both sides of the clamping mechanism and is arranged in a mirror-symmetrical manner.

[0008] Further preferably, the sealing and molding equipment is provided with a total of 4 guide rail devices, the guide rail device includes a guide rail and a guide rail slider, the guide rail is connected to the base through threads, and the guide rail slider is slidably connected to the guide rail.

[0009] Further preferably, the clamping mechanism comprises a lower clamp and an upper clamping component, the lower clamp is connected to the base by threads, and the upper clamping component is connected to the guide rail sliders on both sides of the base by threads.

[0010] Further preferably, the first air cylinder or the first oil cylinder is threadedly connected to the upper clamping component, drives the upper clamping component to move downward to the limit position of the steel-plastic composite pipe and then drives the upper clamping component to return upward along the original path.

[0011] Further preferably, the second air cylinder or the second oil cylinder also includes a second cylinder mounting seat, the second cylinder mounting seat is threadedly connected to the base, the second cylinder or the second oil cylinder is horizontally connected to the second cylinder mounting seat by threads, the movement direction of the piston rod is parallel to the setting direction of the guide rail, the second cylinder or the second oil cylinder drives the upper clamping component to move to the right to a position corresponding to the lower clamp and then drives the upper clamping component to return to the left along the original path.

[0012] Further preferably, the sealing component includes an upper sealing ring and a lower sealing ring, the mold component includes an outer mold and an inner mold, the thermal insulation component includes a first polytetrafluoroethylene thermal insulation ring, a second polytetrafluoroethylene thermal insulation ring, and a polytetrafluoroethylene thermal insulation pad, the upper sealing ring is welded to the outer mold, the lower sealing ring is welded to the inner mold, the first polytetrafluoroethylene thermal insulation ring is clamped between the sealing component and the mold component, the second polytetrafluoroethylene thermal insulation ring is arranged under the heater, the polytetrafluoroethylene thermal insulation pad is arranged between the heater and the heater mounting plate, and the lower sealing ring is connected to the heater mounting plate by threads.

[0013] Further preferably, a taper of less than or equal to 5° is provided in the tube end sealing cavity.

[0014] Further preferably, one end of the third air cylinder or the third oil cylinder is horizontally connected to the mold mechanism on one side through a flange thread, and the other end of the piston rod is horizontally connected to the mold mechanism on the other side through a thread, and the movement direction of the piston rod is parallel to the direction in which the guide rail is set, and the third air cylinder or the third oil cylinder drives the mold mechanism to move left or right.

[0015] Further preferably, the sealing and molding equipment also includes a mold mechanism movable fixing seat, which is threadedly connected or fixedly connected to the base and is located at an extreme blocking position for movement to the left or right on both sides of the mold mechanism.

[0016] A method for sealing and molding a steel-plastic composite pipe by self-melting material, comprising the following steps: A. Place the steel-plastic composite pipe on the lower clamp, drive the upper clamping component to move rightward to the position corresponding to the lower clamp by the second cylinder or the second oil cylinder, and drive the upper clamping component downward to the limit position of the steel-plastic composite pipe by the first cylinder or the first oil cylinder, so that the upper clamping component cooperates with the lower clamp to clamp the steel-plastic composite pipe; B. The third air cylinder or the third oil cylinder drives the mold mechanisms on both sides of the clamping mechanism to move left or right, so that the tube walls at the left and / or right ends of the steel-plastic composite tube enter the tube end sealing cavities of the mold mechanisms on both sides; C. The mold mechanism heats, seals, and cools the steel-plastic composite pipe wall; D. Start the third air cylinder or the third oil cylinder to drive the mold mechanism back to allow the sealed steel-plastic composite pipe end to exit the pipe end sealing cavity.

[0017] The beneficial effects of adopting the above technical solution are: The present invention provides four guide rail devices to ensure that the clamping mechanism and the mold mechanism are stable and accurate during the movement process, thereby ensuring the smooth progress of the sealing and molding operation; By setting up a clamping mechanism, the steel-plastic composite pipe to be sealed can be stably placed and fixed; By setting the first air cylinder or the first oil cylinder, the second air cylinder or the second oil cylinder, and the third air cylinder 7 or the third oil cylinder, the clamping mechanism can move in the horizontal and vertical directions, and the mold mechanism can move horizontally, providing driving force for each part of the equipment, and the repeatability and stability of its actions are high, which effectively reduces the auxiliary time in the sealing process, improves the overall working efficiency of the equipment, and helps to maintain the stability and reliability of the equipment operation; The heater of the mold mechanism ensures that the shallow plastics on the inner and outer walls of the steel-plastic composite pipe are fully melted, providing the necessary material melting conditions for the sealing operation and ensuring that the sealing can be carried out smoothly; the sealing component keeps the rear end of the molten seal cool, and the hot melt material will not flip back to the outside of the die, further ensuring the sealing quality; the heat insulation component effectively reduces the heat transfer between the sealing component and the mold component, avoids the cooling effect from being affected, improves the heat utilization efficiency, and also protects other components from being affected by excessive temperature; the conical pipe end sealing cavity can make the molten material move only forward, so as to reach the end face to complete the sealing process. This sealing process is formed in one step, and no prefabricated sealing ring or other hot melt material introduction is required, which saves costs and improves efficiency, and the sealing and pipe are integrated, and the sealing quality is reliable; By setting up a mold mechanism moving fixed seat, the mold mechanism can be ensured to stop accurately at the predetermined position, avoiding problems such as inaccurate docking between the mold and the pipe and poor sealing due to excessive or insufficient movement, thereby effectively improving the accuracy and stability of the sealing and molding operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 is a top view of the present invention; Figure 4 yes Figure 3 Enlarged view of point B in the middle.

[0019] In the figure: 1-base; 2-guide rail device; 21-guide rail; 22-guide rail slider; 3-clamping mechanism; 31-lower clamp; 32-upper clamping component; 4-first cylinder; 5-second cylinder; 51-second cylinder mounting seat; 6-mold mechanism; 61-sealing component; 611-upper sealing ring; 612-lower sealing ring; 62-mold component; 621-outer mold; 622-inner mold; 63-heater; 64-heater mounting plate; 65-insulating component; 651-first polytetrafluoroethylene insulation ring; 652-second polytetrafluoroethylene insulation ring; 653-polytetrafluoroethylene insulation pad; 66-pipe end sealing cavity; 67-exhaust hole; 7-third cylinder; 8-mold mechanism movable fixed seat. DETAILED DESCRIPTION

[0020] In order to make the features and advantages of the present invention more obvious and easy to understand, the technical solution will be clearly and completely described below in combination with the drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Example

[0021] like Figure 1-4 As shown, a self-melting material sealing and molding equipment for steel-plastic composite pipes includes a base 1, a guide rail device 2, a clamping mechanism 3, a first air cylinder 4 or a first oil cylinder, a second air cylinder 5 or a second oil cylinder, a mold mechanism 6, a third air cylinder 7 or a third oil cylinder, and a mold mechanism movable fixed seat 8 and other components.

[0022] There are 4 guide rail devices 2, one of which is provided on each side of the clamping mechanism 3, and two guide rails are provided between the two sets of mold mechanisms 6. Each guide rail device 2 includes a guide rail 21 and a guide rail slider 22. The guide rail 21 is firmly connected to the base 1 by threads, and has good straightness and load-bearing capacity, providing a precise sliding track for the guide rail slider 22. The guide rail slider 22 is closely matched with the guide rail 21, can slide smoothly on the guide rail 21, and has a certain load-bearing capacity, which can withstand the weight and force of the clamping mechanism 3 and the mold mechanism 6 and other components during the movement process, while ensuring the accuracy and stability during the movement process.

[0023] The clamping mechanism 3 is composed of a lower clamp 31 and an upper clamping part 32. The lower clamp 31 is connected to the base 1 by bolts, and its position remains fixed. Its design shape is compatible with the shape of the steel-plastic composite pipe, and can stably place the steel-plastic composite pipe to be sealed. The upper clamping part 32 is connected to the guide rail sliders on both sides of the base by threads. With the help of the sliding function of the guide rail sliders, it can move left and right, and can move up and down through the first cylinder 4 or the first oil cylinder, so as to cooperate with the lower clamp 31 to complete the clamping and loosening operations of the pipe.

[0024] The first air cylinder 4 or the first oil cylinder is threadedly connected to the upper clamping component 32, and its main function is to drive the upper clamping component 32 to move in the vertical direction. When the first air cylinder 4 or the first oil cylinder is started, its piston rod extends, driving the upper clamping component 32 to move downward until it reaches the limit position of the steel-plastic composite pipe, thereby clamping the pipe together with the lower clamp 31; after the sealing is completed, the upper clamping component 32 can be driven to return upward along the original path, loosening the clamping of the pipe so as to remove the sealed pipe.

[0025] The second air cylinder 5 or the second oil cylinder also includes a second cylinder mounting seat 51, which is connected to the base 1 by threads, providing a stable installation foundation for the second air cylinder 5 or the second oil cylinder. The second cylinder 5 or the second oil cylinder is horizontally connected to the second cylinder mounting seat 51 by threads, and the movement direction of its piston rod is parallel to the setting direction of the guide rail 21. It is mainly used to drive the upper clamping component 32 to move left and right in the horizontal direction. When started, the upper clamping component 32 can be pushed to the right to the exact position corresponding to the lower clamp 31, so that the pipe can be accurately located between the upper and lower clamping parts; after completing the clamping or other related operations, the upper clamping component 32 can be driven to return to the original position to the left.

[0026] The mold mechanism 6 is made of sintered copper, which has good thermal conductivity and air permeability, can quickly and evenly transfer heat, and is conducive to the sealing operation of the steel-plastic composite pipe. The whole set of equipment is equipped with 2 sets of mold mechanisms 6, which are located on both sides of the clamping mechanism 3 and are distributed in a mirror-symmetrical manner, so that both ends of the pipe can be sealed at the same time, greatly improving production efficiency.

[0027] The mold mechanism 6 includes a sealing component 61 , a mold component 62 , a heater 63 , a heater mounting plate 64 , a heat insulating component 65 , a tube end sealing cavity 66 , and an exhaust hole 67 .

[0028] The sealing component 61 (sealing structure for controlling back overflow) includes an upper sealing ring 611 and a lower sealing ring 612. The upper sealing ring 611 is welded to the outer die 621, and the lower sealing ring 612 is welded to the inner die 622, and is connected to the heater mounting plate 64 by threads. The sealing component 61 plays an important role in the sealing process. On the one hand, it can quickly cool the sealing part of the pipe after the sealing is completed, so that the molten plastic only exists in the mold, and the molten material on the outer edge of the mold will not overflow to form a curling edge, thereby enhancing the strength and stability of the seal; at the same time, it can inhibit the plastic on the root tube wall outside the mold from turning back and forming overflow.

[0029] The mold component 62 is composed of an outer die 621 and an inner die 622. The shape of its cavity is compatible with the shape of the end of the steel-plastic composite pipe, and a taper of less than or equal to 5° is provided in the pipe end sealing cavity 66. This taper design is ingenious. During the sealing process, when the plastics on the inner and outer walls of the pipe melt due to heat, the guiding effect of the taper is used to make the molten material move only forward, so that it can smoothly reach the end face of the pipe to complete the sealing process. At the same time, an exhaust hole 67 is left between the mold component 62 and the heater 63 to exhaust the air in the mold component 62. When heating and sealing, the air in the pipe end sealing cavity 66 can be smoothly discharged to avoid defects such as bubbles or cavities in the sealing part, thereby ensuring the sealing quality.

[0030] The heater 63 is fixedly connected to the mold part 62 and fits tightly with the mold part 62. The heater 63 can generate enough heat to quickly melt the inner and outer wall plastics of the steel-plastic composite pipe in the pipe end sealing cavity 66. The mold is usually heated to 250-260°C and the temperature is controlled to be within this range for more than 30 minutes through constant temperature control to ensure that the shallow layer of plastics on the inner and outer walls of the steel-plastic composite pipe can be fully melted to achieve a good sealing effect.

[0031] The heater mounting plate 64 is connected to the sealing component 61 by threads, provides a mounting position for the heater 63 , and plays a certain supporting and connecting role in the structure of the entire mold mechanism 6 .

[0032] The heat insulation component 65 includes a first tetrafluoro heat insulation ring 651, a second tetrafluoro heat insulation ring 652, and a tetrafluoro heat insulation pad 653. The first tetrafluoro heat insulation ring 651 is clamped between the sealing component 61 and the mold component 62, effectively reducing the heat transfer between the sealing component 61 and the mold component 62, and avoiding the cooling effect from being affected; the second tetrafluoro heat insulation ring 652 is arranged under the heater 63 to prevent the excessive heat loss of the heater 63 downward; the tetrafluoro heat insulation pad 653 is arranged between the heater 63 and the heater mounting plate 64, further improving the heat insulation effect, so that the heat generated by the heater 63 can act more concentratedly on the mold component 62, improve the heat utilization efficiency, and also protect the heater mounting plate 64 from being affected by excessive temperature.

[0033] The pipe end sealing cavity 66 is provided with a taper of less than or equal to 5°. The port size of the pipe end sealing cavity 66 is consistent with the pipe wall thickness, and the bottom size is smaller than the pipe wall thickness. The radial difference between the port and the bottom is the melting depth of the plastic on the inner and outer walls of the pipe. Under this structural design, the molten material can only move forward, so as to reach the end surface to complete the sealing process. This sealing process is formed in one step, and no prefabricated sealing ring or other hot melt material is required. It saves costs and improves efficiency. The sealing and the pipe are integrated, and the sealing quality is reliable.

[0034] One end of the third air cylinder 7 or the third oil cylinder is horizontally connected to the mold mechanism 6 on one side through a flange thread, and the other end of the piston rod is horizontally connected to the mold mechanism 6 on the other side through a thread, and the movement direction of the piston rod is parallel to the direction in which the guide rail 21 is set. Its main function is to drive the mold mechanism 6 to move left or right on the guide rail device 2. After the clamping mechanism 3 clamps the pipe, the third air cylinder 7 or the third oil cylinder can push the mold mechanisms 6 on both sides to move toward each other, so that the pipe walls at both ends of the steel-plastic composite pipe can smoothly enter the pipe end sealing cavity 66 of the mold mechanism 6 for heating, sealing and other operations; after the sealing is completed, the mold mechanism 6 can be driven to move in the opposite direction and return to the initial position to take out the sealed pipe.

[0035] The mold mechanism moving fixed seat 8 is installed on the base 1 by means of threaded connection or fixed connection, and is located at the limit blocking position of the left or right movement of both sides of the mold mechanism 6. Its main function is to accurately limit the movement range of the mold mechanism 6, prevent the mold mechanism 6 from exceeding the design range during the movement process, ensure that the mold mechanism 6 can accurately reach the predetermined position every time it runs, and accurately cooperate with the pipe, thereby ensuring the stability and reliability of the sealing and molding operation, and improving the sealing quality and consistency of the product. Example

[0036] A self-melting material sealing and molding method for steel-plastic composite pipes: Take a section of steel-plastic composite pipe to be sealed, the inner and outer walls of the pipe are made of polyethylene material, and the middle steel skeleton layer is exposed on the end face. Place the steel-plastic composite pipe on the lower clamp 31 of the clamping mechanism 3, start the second cylinder 5 or the second oil cylinder to drive the upper clamping part 32 to move rightward, so that it moves to the position corresponding to the lower clamp 31.

[0037] Then start the first air cylinder 4 or the first oil cylinder to drive the upper clamping component 32 to move downward until it reaches the limit position of the steel-plastic composite pipe. At this time, the upper clamping component 32 and the lower clamp 31 are tightly matched to clamp the steel-plastic composite pipe to ensure that the pipe will not be displaced during the subsequent sealing process.

[0038] When the steel-plastic composite pipe is clamped, the third air cylinder 7 or the third oil cylinder is started to drive the mold mechanisms 6 on both sides of the clamping mechanism 3 to move left or right. The mold mechanisms 6 on both sides move toward each other under the action of the third air cylinder 7 or the third oil cylinder, so that the pipe walls at the left and / or right ends of the steel-plastic composite pipe enter the pipe end sealing cavity 66 of the mold mechanisms 6 on both sides.

[0039] Heat the heater 63 in the mold mechanism 6, set the temperature to 250-260° C., and keep the temperature constant for more than 30 minutes to heat, melt, seal, and cool the steel-plastic composite pipe end into shape.

[0040] After the sealing operation is completed, the third air cylinder 7 or the third oil cylinder is started again to drive the mold mechanism 6 to move in the opposite direction, that is, return to the initial position, so that the sealed steel-plastic composite pipe end exits the pipe end sealing cavity 66.

[0041] Then, the first air cylinder 4 or the first oil cylinder is started to drive the upper clamping component 32 to return upward along the original path to release the steel-plastic composite pipe.

[0042] Finally, the sealed steel-plastic composite pipe is taken out from the lower clamp 31 of the clamping mechanism 3, completing the entire sealing and molding process.

[0043] The present invention can not only heat the plastic of the pipe quickly and evenly to melt it, but also cool and shape it efficiently. The exhaust hole avoids sealing defects, the sealing component improves the sealing quality, and the symmetrical arrangement of the mold mechanism cooperates with the third cylinder to achieve simultaneous sealing of both ends. The present invention can be formed in one step without prefabricated sealing rings, saving costs and improving efficiency. The sealing quality is reliable, the equipment runs accurately and stably, and the components are firmly connected for easy maintenance, which effectively improves the economic benefits and product quality of the production of steel-plastic composite pipes, extends the service life of the equipment, and reduces energy consumption and maintenance costs.

[0044] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A self-melting material sealing and molding equipment for steel-plastic composite pipes, characterized in that: The invention comprises a base (1), a guide rail device (2) connected to the base (1) by threads, a clamping mechanism (3) connected to the guide rail device (2) by threads, a first air cylinder (4) or a first oil cylinder connected to the clamping mechanism (3) by threads, a second air cylinder (5) or a second oil cylinder threadedly connected to the clamping mechanism (3), a mold mechanism (6) threadedly connected to the guide rail device (2), and a third air cylinder (7) or a third oil cylinder threadedly connected to the mold mechanism (6), wherein the mold mechanism (6) is made of sintered copper, and comprises a sealing component (61), a sealing component fixedly connected to the A mold part (62) of a sealing part (61), a heater (63) fixedly connected to the mold part (62), a heater mounting plate (64) connected to the sealing part (61) by threads, a heat insulating part (65) clamped between the sealing part (61) and the mold part (62) and between the heater (63) and the heater mounting plate (64), a pipe end sealing cavity (66) arranged between the sealing parts (61), and an exhaust hole (67) arranged on the mold part (62). The mold mechanism (6) is provided with two sets in total, which are located on both sides of the clamping mechanism (3) and are arranged in a mirror-symmetrical manner.

2. The self-melting material sealing and molding equipment for steel-plastic composite pipes according to claim 1 is characterized in that: The sealing and molding equipment is provided with a total of four guide rail devices, wherein the guide rail device (2) comprises a guide rail (21) and a guide rail slider (22), wherein the guide rail (21) is connected to the base (1) via threads, and the guide rail slider (22) is slidably connected to the guide rail (21).

3. The self-melting material sealing and molding equipment for steel-plastic composite pipes according to claim 1 is characterized in that: The clamping mechanism (3) comprises a lower clamp (31) and an upper clamping component (32), wherein the lower clamp (31) is connected to the base (1) via threads, and the upper clamping component (32) is connected to guide rail sliders (22) on both sides of the base via threads.

4. The self-melting material sealing and molding equipment for steel-plastic composite pipes according to claim 1 is characterized in that: The first air cylinder (4) or the first oil cylinder is threadedly connected to the upper clamping component (32), drives the upper clamping component (32) to move downward to the limit position of the steel-plastic composite pipe, and then drives the upper clamping component to return upward along the original path.

5. The self-melting material sealing and molding equipment for steel-plastic composite pipes according to claim 1 is characterized in that: The second air cylinder (5) or the second oil cylinder further comprises a second air cylinder mounting seat (51), the second air cylinder mounting seat (51) being threadedly connected to the base (1), the second air cylinder (5) or the second oil cylinder being horizontally connected to the second air cylinder mounting seat (51) by means of threads, the movement direction of the piston rod being parallel to the setting direction of the guide rail (21), the second air cylinder (5) or the second oil cylinder driving the upper clamping component (32) to move rightward to a position corresponding to the lower clamp and then driving the upper clamping component (32) to return to the left along the original path.

6. The self-melting material sealing and molding equipment for steel-plastic composite pipes according to claim 1 is characterized in that: The sealing component (61) comprises an upper sealing ring (611) and a lower sealing ring (612); the mold component (62) comprises an outer die (621) and an inner die (622); the heat insulating component (65) comprises a first tetrafluoroethylene heat insulating ring (651), a second tetrafluoroethylene heat insulating ring (652), and a tetrafluoroethylene heat insulating pad (653); the upper sealing ring (611) is welded to the outer die (621); the lower sealing ring (612) is welded to the inner die (622); the first tetrafluoroethylene heat insulating ring (651) is clamped between the sealing component (61) and the mold component (62); the second tetrafluoroethylene heat insulating ring (652) is arranged below the heater (63); the tetrafluoroethylene heat insulating pad (653) is arranged between the heater (63) and a heater mounting plate (64); and the lower sealing ring (612) is connected to the heater mounting plate (64) by means of threads.

7. The self-melting material sealing and molding equipment for steel-plastic composite pipes according to claim 1 is characterized in that: The pipe end sealing cavity (66) is provided with a taper of less than or equal to 5°.

8. The self-melting material sealing and molding equipment for steel-plastic composite pipes according to claim 1 is characterized by: One end of the third air cylinder (7) or the third oil cylinder is horizontally connected to the mold mechanism (6) on one side through a flange thread, and the other end of the piston rod is horizontally connected to the mold mechanism (6) on the other side through a thread. The movement direction of the piston rod is parallel to the direction in which the guide rail (21) is set. The third air cylinder (7) or the third oil cylinder drives the mold mechanism (6) to move leftward or rightward.

9. The self-melting material sealing and molding equipment for steel-plastic composite pipes according to claim 1 is characterized in that: The sealing and molding device further comprises a mold mechanism movable fixing seat (8), wherein the mold mechanism movable fixing seat (8) is threadedly connected or fixedly connected to the base (1) and is located at an extreme blocking position for leftward or rightward movement on both sides of the mold mechanism (6).

10. A method for sealing and molding a steel-plastic composite pipe from a self-melting material, characterized in that: The following steps are involved: A. Place the steel-plastic composite pipe on the lower clamp, drive the upper clamping component to move rightward to the position corresponding to the lower clamp by the second cylinder or the second oil cylinder, and drive the upper clamping component downward to the limit position of the steel-plastic composite pipe by the first cylinder or the first oil cylinder, so that the upper clamping component cooperates with the lower clamp to clamp the steel-plastic composite pipe; B. The third air cylinder or the third oil cylinder drives the mold mechanisms on both sides of the clamping mechanism to move left or right, so that the tube walls at the left and / or right ends of the steel-plastic composite tube enter the tube end sealing cavities of the mold mechanisms on both sides; C. The mold mechanism heats, seals, and cools the steel-plastic composite pipe wall; D. Start the third air cylinder or the third oil cylinder to drive the mold mechanism back to allow the sealed steel-plastic composite pipe end to exit the pipe end sealing cavity.

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