Cooling equipment for steel-plastic composite pipe production

Abstract

The invention relates to the technical field of composite pipes, in particular to a cooling device for steel-plastic composite pipe production, which comprises a water storage hopper, a power shell fixedly connected to the upper end of the water storage hopper, a screening shaft engaged to the inner side of the power shell, a heat dissipation module fixedly connected to the side surface of the water storage hopper, and a screening shaft connected to the outer side of the heat dissipation module in a sleeving manner. The upper end of the inner side of the water storage hopper is fixedly connected with a dirt collecting plate. An output wheel is arranged to drive an air blowing wheel to rotate, high-speed gas flow is generated on the inner side of the shell for air cooling of the plastic-steel composite pipe, a movable water spraying ring is arranged, the water spraying ring can spray during air blowing to generate an atomization effect, the temperature of flowing gas is reduced, the plastic-steel composite pipe is wrapped with a cooling pipe, and the cooling effect of the plastic-steel composite pipe is improved. Polyvinyl chloride on the surface of the plastic-steel composite pipe can be rapidly formed, the effects of reducing the peripheral temperature of the plastic-steel composite pipe and carrying out atomization blast cold cutting are achieved, and the problem that a large amount of hot air flow is discharged during air cooling is solved.

Description

Technical Field

[0001] The present application relates to the technical field of steel-plastic composite pipes, and in particular to a cooling device for producing steel-plastic composite pipes. Background Art

[0002] Plastic coated steel pipe, also known as plastic coated pipe, steel plastic composite pipe, plastic coated composite steel pipe, is a steel plastic composite steel pipe with steel pipe as the base, a plastic anti-corrosion layer is welded on the inner surface of the steel pipe (bottom pipe) or on the inner and outer surfaces through spraying, rolling, dipping and suction processes. Plastic coated steel pipe has excellent corrosion resistance and relatively small friction resistance. Epoxy resin coated steel pipe is suitable for the transportation of water supply and drainage, seawater, warm water, oil, gas and other media, and polyvinyl chloride coated steel pipe is suitable for the transportation of drainage, seawater, oil, gas and other media.

[0003] During the production of steel-plastic composite pipes, after the steel pipes are coated with polypropylene, they need to be cooled and formed. The existing cooling mechanism needs to first use air cooling for shaping and then use water cooling to reduce the temperature. This cooling equipment not only takes up a long space, but also consumes a large amount of water and emits a large amount of heat during the cooling process because the coolant cannot be recycled. Therefore, a cooling device for the production of steel-plastic composite pipes is proposed. Summary of the invention

[0004] In order to solve the problems raised in the background technology, the present application provides a cooling device for the production of steel-plastic composite pipes.

[0005] The present application provides a cooling device for the production of steel-plastic composite pipes, which adopts the following technical scheme: it includes a water storage bucket, the upper end of the water storage bucket is fixedly connected to a power shell, the inner side of the power shell is meshed with a screening shaft, the screening shaft is rotatably connected to the water storage bucket, the side of the water storage bucket is fixedly connected to a heat dissipation module, the screening shaft is sleeved on the outer side of the heat dissipation module, the upper end of the inner side of the water storage bucket is fixedly connected to a sewage collecting plate, the inner side of the water storage bucket is fixedly connected to a circulating water pump, the output end of the circulating water pump is fixedly connected and penetrated by a diversion hose, the output end of the diversion hose is fixedly connected and penetrated by a cooling pipe, the end of the cooling pipe away from the diversion hose is fixedly connected and penetrated by a supply plate, the outer side of the supply plate is fixedly connected to a shell, the shell is fixedly connected to the water storage bucket, and the inner end of the shell close to the diversion hose is fixedly connected to an air-cooled The motor and the air-cooled motor are fixedly connected with an output wheel at the output end, and a blower wheel is meshed with the outer circumference of the output wheel, and the blower wheel is rotatably connected to the inner wall of the shell. The end of the output wheel away from the air-cooled motor is slidably connected with a reciprocating rod, and the reciprocating rod is slidably connected to the shell, and a water storage box is slidably connected to the upper inner end of the shell, and the water storage box is connected and penetrated with the diversion hose, and a water sprinkling ring is fixedly connected to the lower end of the water storage box, and the water sprinkling ring is fixedly connected to the reciprocating rod, and a wrapping shell is fixedly connected to the inner side of the shell, and a water inlet is fixedly connected to the upper end of the wrapping shell and penetrated by the water inlet, and a supply plate is fixedly connected and penetrated by the lower end of the water inlet, and a water-draining motor is fixedly connected to the lower outer end of the water inlet, and a water-draining tooth is fixedly connected to the output end of the water-draining motor, and a water-draining wheel is meshed with the outer surface of the water-draining tooth, and the water-draining wheel is rotatably connected to the inner side of the wrapping shell.

[0006] Optionally, the power shell includes an outer shell, a linkage motor and a worm gear. The outer shell is fixedly connected above the water storage bucket, one end of the inner side of the outer shell is fixedly connected to the linkage motor, the output end of the linkage motor is fixedly connected to the worm gear, and the worm gear is on the inner side of the outer shell. The power shell can utilize the internal linkage motor to drive the worm gear so that the screening shaft can rotate in a unified linkage.

[0007] Optionally, one end of the screening shaft is a round tube and the other end is a worm gear. The screening shaft array is distributed at the upper end of the inner side of the water storage bucket. The worm gear of the screening shaft is on the inner side of the outer shell and meshes with the worm. The screening shaft filters the coolant through the intervals of the array to filter out internal impurities. The impurities are pushed to one side through the rotation of the screening shaft to reach the surface of the sewage collecting plate for easy collection.

[0008] Optionally, the center of the output wheel is a cylinder, and teeth are provided on the outer circumference of the cylinder. The teeth on the surface of the output wheel are meshed with the blower wheel. The end face of the output wheel is fixedly connected with a double-toothed key, and the double-toothed key is slidably connected to the reciprocating rod. The output wheel can rotate to drive the blower wheel to rotate, and at the same time, the double-toothed key can be used to squeeze and drive the reciprocating rod to move. The double-toothed key has a triangular sliding key shape.

[0009] Optionally, the blower wheel consists of a circular ring and blower blades. The outer surface of the circular ring is provided with teeth and meshes with the output wheel. The inner side of the circular ring is fixedly connected with blower blades distributed in a circular array. The blower wheel can accelerate the flow of surrounding gas by rotation, thereby achieving the effect of air cooling the plastic-steel composite pipe.

[0010] Optionally, the reciprocating rod is composed of a center rod, a return spring and docking teeth. The center rod is slidably connected to the shell, and a return spring is sleeved on the outside of the center rod. One end of the return spring is fixedly connected to the center rod, and the other end is fixedly connected to the shell. The other end of the center rod away from the return spring is fixedly connected to the docking teeth. Two triangular keys are provided on the surface of the docking teeth and are slidably engaged with the output wheel. The reciprocating rod can utilize the alternating push of the output wheel and the return spring to enable the center rod to drive the water sprinkling ring connected to the surface to move reciprocatingly.

[0011] Optionally, the upper end of the water spraying ring is an elliptical pipe, the lower end of the elliptical pipe is fixedly connected and penetrated by a "C"-shaped circular pipe, a small hole is provided on the inside of the circular pipe, and the circular pipe is half wrapped around the outside of the cooling pipe. The water spraying ring can be wrapped around the surface of the composite pipe to spray coolant for cooling.

[0012] Optionally, the cooling pipe has a spiral pipe shape, the spirals of the cooling pipe have the same pitch and water droplets can pass through, and the cooling pipe can use the coolant flowing inside to reduce the temperature of the surrounding gas, thereby increasing the air cooling effect of the plastic-steel composite pipe surface.

[0013] Optionally, the water-dipping wheel is composed of a stabilizing ring and a water-dipping plate, both ends of the water-dipping plate are fixedly connected to the stabilizing ring, the outer surface of the stabilizing ring at one end is provided with teeth and meshes with the water-dipping teeth, and a wrapping shell is sleeved on the outer side of the water-dipping wheel. The wrapping shell is cylindrical in shape and has a long strip opening at the lower end. The water-dipping wheel can rotate to dig the coolant inside the wrapping shell so that the coolant covers and flushes the surface of the composite pipe.

[0014] In summary, this application includes the following beneficial technical effects: The cooling equipment for the production of steel-plastic composite pipes is provided with an output wheel to drive the blower wheel to rotate, so that a high-speed gas flow is generated inside the shell to air-cool the plastic-steel composite pipe. A movable water spray ring is provided so that the water spray ring can spray during the blowing to produce an atomizing effect, thereby reducing the temperature of the flowing gas. The cooling pipe is wrapped around the outside of the plastic-steel composite pipe so that the polyvinyl chloride on the surface of the plastic-steel composite pipe can be quickly formed, thereby achieving the effect of reducing the peripheral temperature of the plastic-steel composite pipe and performing atomizing blast cooling and cutting, and solving the problem of a large amount of hot air flow being discharged during air cooling.

[0015] The cooling equipment for the production of steel-plastic composite pipes is provided with a water spraying ring to spray the plastic-steel composite pipe, and a wrapping shell and a water dial are provided so that the water dial rotates inside the wrapping shell to stir the coolant to wash the surface of the plastic-steel composite pipe, thereby realizing water cooling. The used coolant is filtered through an array screening shaft to remove impurities inside the coolant, and the screening shaft is cooled through a heat dissipation module so that the coolant can be recycled again at a lower temperature, thereby achieving the effect of filtering, cooling and recycling the coolant during water cooling, and solving the problem of wasting a large amount of coolant during the water cooling process.

[0016] The cooling equipment for the production of steel-plastic composite pipes starts a circulating water pump and uses a diverter hose to allow the coolant to enter a water storage box, and then allows the coolant to enter a water sprinkler ring from the water storage box, and then enter the inner side of the cooling pipe through the liquid diverter hose. The cooling pipe is wrapped around the outside so that the surface of the composite pipe can be cooled. The coolant passing through the cooling pipe enters the water inlet from the supply plate, thereby achieving the effect of combining water cooling and air cooling to cool the pipe, and solving the problem that the equipment cooling length is long and occupies more space. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the present application; Figure 2 is a schematic diagram of the structure of the inner side of the housing in the embodiment of the present application; Figure 3 This is a schematic diagram of the screening shaft structure in an embodiment of the present application; Figure 4 is a schematic diagram of the structure of the diverter hose in the embodiment of the present application; Figure 5 This is a schematic diagram of the structure of the water spray ring in the embodiment of the present application; Figure 6 This is a schematic diagram of the cooling tube structure in the embodiment of the present application; Figure 7 This is a schematic diagram of the structure of the water wheel in the embodiment of the present application; Figure 8 This is a schematic diagram of the structure of the sewage collecting plate in the embodiment of the present application; Fig. 9 It is a schematic diagram of the wrapping shell structure in the embodiment of the present application.

[0018] Figure numerals: water storage bucket-1, power shell-2, outer shell-201, linkage motor-202, worm-203, screening shaft-3, heat dissipation module-4, sewage collecting plate-5, circulating water pump-6, diversion hose-7, cooling pipe-8, supply plate-9, shell-10, air-cooled motor-11, output wheel-12, blower wheel-13, ring-131, blower blade-132, reciprocating rod-14, center rod-141, return spring-142, docking tooth-143, water storage box-15, water sprinkling ring-16, wrapping shell-17, water filling port-18, water-displacing motor-19, water-displacing tooth-20, water-displacing wheel-21, stabilizing ring-211, water-displacing plate-212. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1-9 This application is described in further detail.

[0020] The present application discloses a cooling device for producing steel-plastic composite pipes. Figure 1 As shown, it includes a water storage bucket 1, the upper end of the water storage bucket 1 is fixedly connected to a power shell 2, the inner side of the power shell 2 is meshed with a screening shaft 3, the power shell 2 includes an outer shell 201, a linkage motor 202 and a worm 203, the outer shell 201 is fixedly connected above the water storage bucket 1, one end of the inner side of the outer shell 201 is fixedly connected to the linkage motor 202, the output end of the linkage motor 202 is fixedly connected to the worm 203, the worm 203 is on the inner side of the outer shell 201, and the power shell 2 can utilize the internal linkage motor 202 to drive the worm 203 so that the screening shaft 3 can rotate in a unified linkage manner.

[0021] The screening shaft 3 is rotatably connected to the water storage bucket 1, and a heat dissipation module 4 is fixedly connected to the side of the water storage bucket 1. The heat dissipation module 4 is a conventional refrigeration mechanism. The screening shaft 3 is sleeved on the outside of the heat dissipation module 4, and a sewage collecting plate 5 is fixedly connected to the upper end of the inner side of the water storage bucket 1. One end of the screening shaft 3 is a round tube and the other end is a worm gear. The screening shaft 3 is distributed in an array at the upper end of the inner side of the water storage bucket 1. The worm gear of the screening shaft 3 is on the inner side of the outer shell 201 and meshes with the worm 203. The screening shaft 3 filters the coolant through the intervals of the array to screen out the internal impurities, and the impurities are pushed to one side through the rotation of the screening shaft 3 to reach the surface of the sewage collecting plate 5 for easy collection.

[0022] A circulating water pump 6 is fixedly connected to the inside of the water storage bucket 1, and a diverter hose 7 is fixedly connected to the output end of the circulating water pump 6 and penetrates therethrough, and a cooling pipe 8 is fixedly connected to the output end of the diverter hose 7 and penetrates therethrough, and the cooling pipe 8 is a spiral pipe in shape, and the spirals of the cooling pipe 8 have the same pitch and water droplets can pass through, and the cooling pipe 8 can use the coolant flowing inside to reduce the temperature of the surrounding gas, thereby increasing the air-cooling effect on the surface of the plastic-steel composite pipe.

[0023] The cooling pipe 8 is fixedly connected to one end away from the diversion hose 7 and penetrates a supply plate 9, a shell 10 is fixedly connected to the outside of the supply plate 9, the shell 10 is fixedly connected to the water storage bucket 1, and an air-cooling motor 11 is fixedly connected to one end of the inner side of the shell 10 close to the diversion hose 7, an output end of the air-cooling motor 11 is fixedly connected to an output wheel 12, a blower wheel 13 is meshed on the outer peripheral surface of the output wheel 12, and the blower wheel 13 consists of a circular ring 131 and blower blades 132, the outer surface of the circular ring 131 is provided with teeth and meshed with the output wheel 12, a circular array of distributed blower blades 132 are fixedly connected to the inner side of the circular ring 131, and the blower wheel 13 can accelerate the flow of surrounding gas by rotation, thereby achieving the effect of air cooling the plastic-steel composite pipe.

[0024] The blower wheel 13 is rotatably connected to the inner wall of the shell 10, and the end of the output wheel 12 away from the air-cooled motor 11 is slidably connected to the reciprocating rod 14. The center of the output wheel 12 is a cylinder, and the outer circumference of the cylinder is provided with teeth. The teeth on the surface of the output wheel 12 are meshed with the blower wheel 13. The end face of the output wheel 12 is fixedly connected with a double tooth key, and the double tooth key is slidably connected to the reciprocating rod 14. The output wheel 12 can rotate to drive the blower wheel 13 to rotate, and at the same time, the double tooth key can be used to squeeze and push the reciprocating rod 14 to move. The double tooth key has a triangular sliding key shape.

[0025] The reciprocating rod 14 is slidably connected to the shell 10, and a water storage box 15 is slidably connected to the upper inner end of the shell 10. The water storage box 15 is connected and penetrated with the diversion hose 7. The lower end of the water storage box 15 is fixedly connected to a water spraying ring 16. The upper end of the water spraying ring 16 is an elliptical pipe, and the lower end of the elliptical pipe is fixedly connected and penetrated by a "C"-shaped circular pipe. Small holes are provided on the inside of the circular pipe. The circular pipe is half wrapped around the outside of the cooling pipe 8. The water spraying ring 16 can be wrapped around the surface of the composite pipe to spray coolant for cooling.

[0026] The water sprinkling ring 16 is fixedly connected to the reciprocating rod 14, and the reciprocating rod 14 is composed of a center rod 141, a return spring 142 and a docking tooth 143. The center rod 141 is slidably connected to the shell 10, and a return spring 142 is sleeved on the outer side of the center rod 141. One end of the return spring 142 is fixedly connected to the center rod 141, and the other end is fixedly connected to the shell 10. The other end of the center rod 141 away from the return spring 142 is fixedly connected to the docking tooth 143. Two triangular keys are provided on the surface of the docking tooth 143 and are slidably engaged with the output wheel 12. The reciprocating rod 14 can utilize the alternating push of the output wheel 12 and the return spring 142 to enable the center rod 141 to drive the water sprinkling ring 16 connected to the surface to move back and forth.

[0027] A wrapping shell 17 is fixedly connected to the inner side of the shell body 10, and a water inlet 18 is fixedly connected to the upper end of the wrapping shell 17 and penetrated by the wrapping shell 17. The supply plate 9 is fixedly connected to and penetrated by the lower end of the water inlet 18, and a water-displacing motor 19 is fixedly connected to the lower end of the outer side of the water inlet 18. A water-displacing tooth 20 is fixedly connected to the output end of the water-displacing motor 19, and a water-displacing wheel 21 is meshed on the outer surface of the water-displacing tooth 20. The water-displacing wheel 21 is rotatably connected to the inner side of the wrapping shell 17. The water-displacing wheel 21 consists of a stabilizing ring 211 and a water-displacing plate 212. Stabilizing rings 211 are fixedly connected to both ends of the water-displacing plate 212. The outer surface of the stabilizing ring 211 at one end is provided with teeth and meshed with the water-displacing tooth 20. The outer side of the water-displacing wheel 21 is sleeved with the wrapping shell 17. The wrapping shell 17 is cylindrical in shape and a long strip opening is provided at the lower end. The water-displacing wheel 21 can rotate to move the coolant inside the wrapping shell 17 so that the coolant covers and flushes the surface of the composite pipe.

[0028] The implementation principle of a cooling device for producing steel-plastic composite pipes in the embodiment of the present application is as follows: when in use, first, the composite pipe is passed through the inner side of the shell 10. When the composite pipe passes through the shell 10, the circulating water pump 6 is first started to use the diverter hose 7 to allow the coolant to enter the water storage box 15, and the coolant is allowed to enter the water spraying ring 16 from the water storage box 15, so that the coolant is sprayed on the surface of the composite pipe, and the output wheel 12 is driven to rotate by starting the air-cooling motor 11, so that the output wheel 12 rotates to intermittently extrude the docking teeth 143, so that the center rod 141 pushes the extrusion reset spring 142, and the reciprocating rod 14 is repeatedly pushed, so that the reciprocating rod 14 moves back and forth to pour the coolant from the water spraying ring 16 to spray the coolant on the outside of the composite pipe, and the liquid inside the diverter hose 7 is diverted into the inner side of the cooling pipe 8, and the cooling pipe 8 is wrapped around the outside so that the surface of the composite pipe can be cooled, and the coolant passing through the cooling pipe 8 enters the water inlet 18 from the supply plate 9, and when the output wheel 12 rotates to extrude the docking teeth 143, it rotates and pushes the ring 13 1, so that the fan blades 132 rotate to blow air, so that the surface of the composite pipe is air-cooled, and the fan blades 132 blow the airflow to cool the composite pipe while the coolant sprayed by the water ring 16 cannot reduce the temperature of the inner side of the shell 10. When the composite pipe passes through the wrapping shell 17, it is flushed and cooled by the coolant entering the water inlet 18. By starting the water-displacing motor 19 to drive the water-displacing teeth 20 to rotate and push the water-displacing wheel 21, the liquid inside the wrapping shell 17 can flow evenly over the surface of the composite pipe, and the used coolant inside the wrapping shell 17 flows out from the bottom of the wrapping shell 17. When the coolant needs to be added, it is poured from the water inlet 18. After use, the coolant is filtered from the surface gap of the screening shaft 3 into the water storage bucket 1, and the linkage motor 202 is started to drive the worm 203 to rotate, so that the screening shaft 3 rotates in the same direction, so that the impurities mixed in the coolant are collected on the surface of the dirt collecting plate 5 for easy cleaning, and when the liquid passes through the screening shaft 3, the heat dissipation module 4 can reduce the temperature inside the liquid.

[0029] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A cooling device for producing steel-plastic composite pipes, comprising a water storage bucket (1), characterized in that: The upper end of the water storage bucket (1) is fixedly connected to a power shell (2), the inner side of the power shell (2) is meshed with a screening shaft (3), the screening shaft (3) is rotatably connected to the water storage bucket (1), the side of the water storage bucket (1) is fixedly connected to a heat dissipation module (4), the screening shaft (3) is sleeved on the outer side of the heat dissipation module (4), the upper end of the inner side of the water storage bucket (1) is fixedly connected to a sewage collecting plate (5), the inner side of the water storage bucket (1) is fixedly connected to a circulating water pump (6), the output end of the circulating water pump (6) is fixedly connected to and penetrated by a diversion hose (7), the output end of the diversion hose (7) is fixedly connected to and penetrated by a cooling pipe (8), the end of the cooling pipe (8) away from the diversion hose (7) is fixedly connected to and penetrated by a supply plate (9), the outer side of the supply plate (9) is fixedly connected to a shell (10), the shell (10) The housing (10) is fixedly connected to the water storage bucket (1), and one end of the housing (10) near the diversion hose (7) is fixedly connected to an air-cooled motor (11). The output end of the air-cooled motor (11) is fixedly connected to an output wheel (12). The outer peripheral surface of the output wheel (12) is meshed with a blower wheel (13). The blower wheel (13) is rotatably connected to the inner wall of the housing (10). The end of the output wheel (12) away from the air-cooled motor (11) is slidably connected to a reciprocating rod (14). The reciprocating rod (14) is slidably connected to the housing (10). The upper end of the inner side of the housing (10) is slidably connected to a water storage box (15). The water storage box (15) is connected to and penetrates the diversion hose (7). The lower end of the water storage box (15) is fixedly connected to a water spraying ring (16). The water spraying ring (16) is fixedly connected to the reciprocating rod (14). The housing (10) is fixedly connected to a wrapping shell (17) on the inside, the wrapping shell (17) is fixedly connected to and penetrated by a water inlet (18) on the upper end, the supply plate (9) is fixedly connected to and penetrated by the lower end of the water inlet (18), a water pumping motor (19) is fixedly connected to the lower end of the outer side of the water inlet (18), a water pumping tooth (20) is fixedly connected to the output end of the water pumping motor (19), the outer surface of the water pumping tooth (20) is meshed with a water pumping wheel (21), and the water pumping wheel (21) is rotatably connected to the inside of the wrapping shell (17).

2. The cooling device for producing steel-plastic composite pipes according to claim 1 is characterized in that: The power housing (2) comprises an outer shell (201), a linkage motor (202) and a worm (203); the outer shell (201) is fixedly connected above the water storage bucket (1); one end of the inner side of the outer shell (201) is fixedly connected to the linkage motor (202); the output end of the linkage motor (202) is fixedly connected to the worm (203); and the worm (203) is located on the inner side of the outer shell (201).

3. A cooling device for producing steel-plastic composite pipes according to claim 1 or 2, characterized in that: One end of the screening shaft (3) is a circular tube and the other end is a worm gear. The screening shafts (3) are arranged in an array at the upper end of the inner side of the water storage bucket (1). The worm gear of the screening shaft (3) is on the inner side of the housing (201) and meshes with the worm (203).

4. The cooling device for producing steel-plastic composite pipes according to claim 1, characterized in that: The center of the output wheel (12) is a cylinder, and teeth are arranged on the outer peripheral surface of the cylinder. The teeth on the surface of the output wheel (12) mesh with the blower wheel (13). The end surface of the output wheel (12) is fixedly connected with a double tooth key, and the double tooth key is slidably connected to the reciprocating rod (14).

5. The cooling device for producing steel-plastic composite pipes according to claim 1 is characterized in that: The blower wheel (13) is composed of a circular ring (131) and blower blades (132); the outer surface of the circular ring (131) is provided with teeth and meshes with the output wheel (12); the inner side of the circular ring (131) is fixedly connected with blower blades (132) distributed in a circular array.

6. The cooling device for producing steel-plastic composite pipes according to claim 1, characterized in that: The reciprocating rod (14) is composed of a center rod (141), a return spring (142) and a docking tooth (143); the center rod (141) is slidably connected to the housing (10); the return spring (142) is sleeved on the outer side of the center rod (141); one end of the return spring (142) is fixedly connected to the center rod (141) and the other end is fixedly connected to the housing (10); the other end of the center rod (141) away from the return spring (142) is fixedly connected to the docking tooth (143); two triangular keys are provided on the surface of the docking tooth (143) and are slidably engaged with the output wheel (12).

7. The cooling device for producing steel-plastic composite pipes according to claim 1, characterized in that: The upper end of the water spraying ring (16) is an elliptical pipe, the lower end of which is fixedly connected to and penetrated by a "C"-shaped circular pipe, the inner side of which is provided with a small hole, and the circular pipe is half-wrapped around the outer side of the cooling pipe (8).

8. The cooling device for producing steel-plastic composite pipes according to claim 1, characterized in that: The cooling pipe (8) has a spiral pipe shape, and the spirals of the cooling pipe (8) have the same pitch and water droplets can pass through.

9. The cooling device for producing steel-plastic composite pipes according to claim 1, characterized in that: The water-displacing wheel (21) is composed of a stabilizing ring (211) and a water-displacing plate (212). Both ends of the water-displacing plate (212) are fixedly connected to the stabilizing ring (211). The outer surface of the stabilizing ring (211) at one end is provided with teeth and meshes with the water-displacing teeth (20). The outer side of the water-displacing wheel (21) is sleeved with a wrapping shell (17). The wrapping shell (17) is cylindrical in shape and has a long strip opening at the lower end.

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