A spraying and winding device for small-bore cast iron heat preservation pipe

Abstract

The utility model relates to a kind of spraying winding device for small-bore cast iron heat preservation pipe in the production technology field of heat preservation pipe, including the working pipe transmission line, spraying transmission line, electromagnetic heating coil, spraying chamber, winding transmission line, plastic extruding machine, cooling chamber and heat preservation pipe transmission line arranged in order from front to back, spraying chamber is equipped with polyurethane spray gun, cooling chamber is equipped with water spraying assembly and water removal assembly;Each transmission line is using spiral roller transmission line, including support base, roller support, spiral roller and driving motor, two horizontal rotary shafts are rotatably arranged on roller support left and right symmetry, driving motor is connected with two horizontal rotary shafts by transmission mechanism, spiral roller is equipped on the outside of horizontal rotary shaft, spiral protruding edge is wound outside spiral roller, so that pipeline edge circumferential rolling edge axial conveying.The device structure is simple, relatively lower cost, better adapt to the production preparation of small-bore heat preservation pipe, avoid large-bore and small-bore specification switching to cause time waste.

Description

Technical Field

[0001] This utility model belongs to the field of thermal insulation pipe production technology, specifically relating to a spraying and winding device for small-diameter cast iron thermal insulation pipes. Background Technology

[0002] Thermal pipelines, also known as insulated pipes, mainly consist of a working pipe, an insulation layer, and an outer protective layer. The working pipe is mostly made of cast iron, with a polyurethane foam layer sprayed on the outside. A polyethylene wrapping layer is then wrapped around the outside of the polyurethane insulation layer. There are two main laying methods for insulated pipes: direct-buried thermal pipelines and overhead thermal pipelines. Regardless of the laying method, insulated pipes are generally prefabricated in the factory and then transported to the construction site for laying. Existing prefabricated insulation pipe production lines generally use tire-type pipe conveyor lines for spraying and winding, such as the spraying conveyor line disclosed in patent document CN116872480A. This pipe conveying equipment consists of several sets of rolling tire mechanisms, resulting in a very complex structure, large equipment size, large footprint, and high manufacturing and cost. It is generally suitable for continuous spraying and winding of large-diameter main insulation pipes. Furthermore, tire-type pipe conveyor lines are designed for the production of main thermal pipelines, and the gaps between their drive tires are relatively wide, making them unsuitable for the direct production of small-diameter insulation pipes. Each switch from large-diameter to small-diameter cast iron insulation pipe production requires equipment debugging time, delaying production and affecting efficiency. Therefore, there is an urgent need to design a spraying and winding device that is better suited for the production of small-diameter cast iron insulation pipes. Utility Model Content

[0003] In view of the above situation, this utility model provides a spraying and wrapping device for small-diameter cast iron insulation pipes, which can better adapt to the production and preparation of small-diameter insulation pipes.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A spraying and winding device for small-diameter cast iron insulation pipes includes a working pipe drive line, a spraying drive line, a spraying chamber, a winding drive line, an extruder, and an insulation pipe drive line arranged sequentially from front to back according to the direction of heat pipeline transportation. A polyurethane spray gun is installed on the side wall of the spraying chamber for spraying a polyurethane insulation layer onto the outer surface of the working pipe. The extrusion end of the extruder is close to the outer surface of the polyurethane insulation layer and is equipped with an extrusion die for winding a polyethylene outer protective layer around the outside of the polyurethane insulation layer.

[0005] An electromagnetic heating coil is also installed between the spraying transmission line and the spraying chamber to preheat the working pipe before spraying, so that the polyurethane spray coating can better adhere to the surface of the working pipe; a cooling chamber is also installed between the extruder and the insulation pipe transmission line, and the cooling chamber is equipped with a water spraying component and a water removal component, which are used to water-cool and shape the finished insulation pipe after the outer protective layer is wrapped, and to blow away water; the working pipe transmission line, spraying transmission line, winding transmission line and insulation pipe transmission line all adopt spiral roller transmission lines.

[0006] The spiral roller transmission line includes a support base, a roller bracket, spiral rollers, and a drive motor. The roller bracket and drive motor are fixedly installed above the support base. Two horizontal rotating shafts are symmetrically and rotatably mounted above the roller bracket, arranged parallel to each other in the front-back direction. The drive motor is connected to the two horizontal rotating shafts through a transmission mechanism. Spiral rollers are coaxially fixed on the outer sides of the two horizontal rotating shafts. Spiral ribs are fixedly wound on the outer surfaces of the two spiral rollers. The inner upper surfaces of the two spiral ribs are in frictional contact with the outer surface of the heat pipe. That is, the heat pipe is movably placed above the spiral ribs between the two spiral rollers. As the spiral rollers and their spiral ribs rotate, the heat pipe can roll circumferentially while simultaneously achieving axial transport along the pipe axis. Furthermore, the front and rear sides of the spraying chamber are respectively provided with inlets and outlets for heat pipes to pass through. The nozzle of the polyurethane spray gun extends into the spraying chamber and onto the side surface near the working surface for spraying coating material onto the working pipe surface. The top of the spraying chamber is also provided with an exhaust pipe to prevent polyurethane particles in the spraying chamber from drifting to the outside. A filter is installed on the exhaust pipe, and the exhaust pipe is connected to the exhaust gas treatment system.

[0007] Furthermore, the water spray assembly includes a spray pipe network suspended at the top of the cooling chamber, with several spray heads evenly distributed below the spray pipe network for spraying cooling water onto the surface of the heat pipes. A circulating water tank is provided below the cooling chamber, and the circulating water tank supplies cooling water to the spray pipe network through a circulating pump and a water supply pipe.

[0008] Furthermore, the dewatering assembly includes an annular air duct located at the rear of the cooling chamber. The air inlet of the annular air duct is connected to a compressed air network. Multiple jet air knives are arranged in a ring on the inner side of the annular air duct, blowing air towards the surface of the heat pipe. This can form an isolation air curtain around the surface of the heat pipe, thereby drying the residual water droplets left on the surface of the heat pipe.

[0009] Furthermore, the front and rear ends of the horizontal rotating shaft are rotatably connected to the roller bracket through rotary bearings, and the transmission mechanism is a dual-output shaft reducer that can simultaneously drive the two horizontal rotating shafts to rotate synchronously in the same direction. The reducer gearbox can realize the synchronous rotation of the two output shafts in the same direction.

[0010] Furthermore, the two output ends of the dual output shaft reducer are each coaxially fixed to the two horizontal rotating shafts via couplings. The motor base of the drive motor is fixedly connected to the support base. The motor shaft of the drive motor is fixedly connected to the input end of the dual output shaft reducer. The drive motor and the dual output shaft reducer are fitted with protective covers on their outer sides.

[0011] Furthermore, the spiral roller and the spiral protrusion are integrally formed spiral rubber rollers, and multiple spiral rubber rollers are coaxially connected on the same horizontal rotating shaft. The horizontal rotating shaft between each spiral rubber roller is rotatably connected to the roller support through a rotary bearing.

[0012] This utility model also includes other components that enable its normal use, all of which are conventional means in the field. In addition, devices or components not limited in this utility model, such as: spray booth, polyurethane spray gun, electromagnetic heating coil, extruder, extrusion die, dual output shaft reducer, etc., all adopt the prior art in the field.

[0013] The beneficial effects of this utility model are as follows: This utility model provides a spraying and winding device for small-diameter cast iron insulation pipes, which can better adapt to the production and preparation of small-diameter insulation pipes and avoid the time wasted caused by frequent switching and debugging between large-diameter and small-diameter insulation pipes. At the same time, compared with the existing tire-type pipeline transmission line, the device has a simpler structure and relatively lower equipment investment cost. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the spray coating and winding device for small-diameter cast iron insulation pipes according to this utility model. Figure 2 for Figure 1 Schematic diagram of the spiral roller drive line structure along the AA direction; Figure 3 for Figure 1 A schematic diagram of the spray booth and electromagnetic heating coil structure along the BB direction; Figure 4 for Figure 1 A schematic diagram of the cooling chamber and annular duct structure along the CC direction. Detailed Implementation

[0015] The present invention will now be clearly described with reference to the accompanying drawings and specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art based on the embodiments of the present invention without creative effort to obtain all other embodiments should be included within the protection scope of the present invention.

[0016] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "inner," "outer," "center," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] Example 1 like Figure 1-4 As shown, a spraying and winding device for small-diameter cast iron insulation pipes includes a working pipe transmission line 1, a spraying transmission line 2, a spraying chamber 3, a winding transmission line 4, an extruder 5, and an insulation pipe transmission line 6, arranged sequentially from front to back according to the direction of heat pipeline transportation. A polyurethane spray gun 7 is installed on the side wall of the spraying chamber. The polyurethane spray gun is externally connected to a spraying material supply system (not shown in the figure; the polyurethane foam material for insulation pipes is generally made from high-performance polyether polyol blends and polymethylene polyphenyl isocyanate through a chemical reaction foaming process, which is existing technology and will not be described in detail here). This system is used to spray a polyurethane insulation layer onto the outer surface of the working pipe. The extrusion end of the extruder is close to the outer surface of the polyurethane insulation layer and is equipped with an extrusion die 8, which is used to wind a polyethylene outer protective layer around the outside of the polyurethane insulation layer. Both the extruder and the extrusion die are existing technologies and will not be described in detail here.

[0018] An electromagnetic heating coil 9 is also installed between the spraying transmission line and the spraying chamber to preheat the working pipe before spraying, so that the sprayed polyurethane foam material can better adhere to the surface of the working pipe. The electromagnetic heating coil adopts existing technology and will not be described in detail here. A cooling chamber 10 is also installed between the extruder and the insulation pipe transmission line. The cooling chamber is equipped with a water spraying component and a water removal component, which are used to water-cool and shape the finished insulation pipe after the outer protective layer is wrapped, and to blow away water. The working pipe transmission line, spraying transmission line, winding transmission line and insulation pipe transmission line are all spiral roller transmission lines.

[0019] The spiral roller transmission line includes a support base 11, a roller bracket 12, a spiral roller 13, and a drive motor 14. The roller bracket and the drive motor are fixedly installed above the support base. Two horizontal rotating shafts 15 are symmetrically and rotatably mounted above the roller bracket, arranged parallel to each other in the front-back direction. The drive motor is connected to the two horizontal rotating shafts through a transmission mechanism. Spiral rollers are coaxially fixed on the outer sides of the two horizontal rotating shafts. Spiral ribs 16 are fixedly wound on the outer surfaces of the two spiral rollers. The inner upper surfaces of the two spiral ribs are in frictional contact with the outer surface of the heat pipe. That is, the heat pipe is movably placed above the spiral ribs between the two spiral rollers. As the spiral rollers and their spiral ribs rotate, the heat pipe can roll circumferentially while simultaneously achieving axial transport along the axis of the heat pipe. Compared with the existing tire-type pipe transmission line, the structure is relatively simpler, and the manufacturing and use costs are relatively lower. Specifically, the front and rear ends of the horizontal rotating shaft are rotatably connected to the roller bracket via rotary bearings. The transmission mechanism is a dual-output shaft reducer capable of simultaneously driving both horizontal rotating shafts to rotate synchronously in the same direction. The synchronous rotation of the two output shafts is achieved through the transmission engagement of a gear set within the reducer's gearbox. The dual-output shaft reducer is existing technology and will not be described in detail here.

[0020] Specifically, the two output ends of the dual-output shaft reducer are each coaxially fixed to the two horizontal rotating shafts via couplings. The motor base of the drive motor is fixedly connected to the support base. The motor shaft of the drive motor is fixedly connected to the input end of the dual-output shaft reducer. Furthermore, a protective cover 17 is provided on the outside of the drive motor and the dual-output shaft reducer. This can help avoid the risk of mechanical damage and also protect the equipment from dust and water.

[0021] Specifically, the spiral roller and spiral protrusion are integrally formed spiral rubber rollers. Multiple spiral rubber rollers are coaxially connected on the same horizontal rotating shaft. Roller supports are provided in the gaps between adjacent spiral rubber rollers. The horizontal rotating shafts between each spiral rubber roller are rotatably connected to the roller supports through rotary bearings. The structure of a longer spiral roller is formed by combining multiple spiral rollers in series, which helps to improve the equipment stability and maintenance convenience of the spiral roller transmission line, enhance the structural strength of the spiral roller, and reduce the equipment load on the drive motor.

[0022] Example 2 Based on Example 1, the spraying chamber has inlet and outlet 18 on its front and rear sides, allowing heat pipes to pass through. The nozzle of the polyurethane spray gun extends into the spraying chamber and onto the surface near the working surface, for spraying coating material onto the working pipe surface. An exhaust pipe 19 is also installed at the top of the spraying chamber to prevent polyurethane particles from drifting out of the spraying chamber and thus avoiding increased air pollution in the workshop. A filter 20 is installed on the exhaust pipe, such as a replaceable pluggable air filter. The exhaust pipe is connected to an exhaust gas treatment system (not shown in the figure). The exhaust gas treatment system uses existing technology and will not be described in detail here.

[0023] Example 3 Based on Embodiment 2, the water spraying assembly includes a spray pipe network 21 suspended at the top of the cooling chamber, and a plurality of spray heads 22 are evenly distributed below the spray pipe network for spraying cooling water onto the surface of the heat pipe. Because the temperature of the polyethylene outer sheath wound by the extruder is high, it needs to be cooled and shaped in time. A circulating water tank is provided below the cooling chamber, and the circulating water tank supplies cooling water to the spray pipe network through a circulating pump 23 and a water supply pipe.

[0024] The dewatering assembly includes an annular duct 24 located at the rear of the cooling chamber. The air inlet of the annular duct is connected to a compressed air network. Multiple jet air knives 25 are arranged in a ring around the inner side of the annular duct, blowing air towards the surface of the heat pipe. The compressed air network uses existing technology and will not be described in detail here. Preferably, the jet air knives are arranged in a cross shape with four duckbill-shaped flat jet air knives, which can form a ring of isolation air curtain around the surface of the heat pipe, thereby drying the residual water droplets left on the surface of the heat pipe.

[0025] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A spraying and winding device for small-diameter cast iron insulation pipes, comprising a working pipe drive line, a spraying drive line, a spraying chamber, a winding drive line, an extruder, and an insulation pipe drive line arranged sequentially from front to back according to the direction of heat pipeline transportation; a polyurethane spray gun is installed on the side wall of the spraying chamber for spraying a polyurethane insulation layer onto the outer surface of the working pipe; the extrusion end of the extruder is close to the outer surface of the polyurethane insulation layer and is equipped with an extrusion die for winding a polyethylene outer sheath around the outside of the polyurethane insulation layer; characterized in that: An electromagnetic heating coil is also installed between the spraying transmission line and the spraying chamber to preheat the working pipe before spraying. A cooling chamber is also installed between the extruder and the insulation pipe transmission line. The cooling chamber is equipped with a water spraying component and a water removal component to water-cool and shape the finished insulation pipe after the outer protective layer is wrapped, and to blow away water. The working pipe transmission line, spraying transmission line, winding transmission line and insulation pipe transmission line all adopt a spiral roller transmission line. The spiral roller transmission line includes a support base, a roller bracket, a spiral roller and a drive motor. The roller bracket and the drive motor are fixedly installed above the support base. Two horizontal rotating shafts are symmetrically rotatably mounted on the roller bracket and arranged parallel to each other in the front-back direction. The drive motor is connected to the two horizontal rotating shafts through a transmission mechanism. Spiral rollers are fixedly fixed on the outer side of the horizontal rotating shafts. Spiral ribs are fixedly wound on the outer surface of the two spiral rollers. The inner upper surface of the two spiral ribs is in frictional contact with the outer surface of the heat pipe, so as to make the heat pipe roll circumferentially and transport axially.

2. The spray coating and winding device for small-diameter cast iron insulation pipes according to claim 1, characterized in that: The front and rear sides of the spraying chamber are respectively provided with inlets and outlets for heat pipes to pass through. The nozzle of the polyurethane spray gun extends into the spraying chamber and onto the side surface near the working surface for spraying coating material onto the working pipe surface. The top of the spraying chamber is also provided with an exhaust pipe to prevent polyurethane particles in the spraying chamber from drifting to the outside. A filter is installed on the exhaust pipe, and the exhaust pipe is connected to the exhaust gas treatment system.

3. The spray coating and winding device for small-diameter cast iron insulation pipes according to claim 1, characterized in that: The water spray assembly includes a spray pipe network suspended at the top of the cooling chamber, with several spray heads evenly distributed below the spray pipe network for spraying cooling water onto the surface of the heat pipes. A circulating water tank is provided below the cooling chamber, and the circulating water tank supplies cooling water to the spray pipe network through a circulating pump and a water supply pipe.

4. The spray coating and winding device for small-diameter cast iron insulation pipes according to claim 3, characterized in that: The dewatering assembly includes an annular duct located at the rear of the cooling chamber. The air inlet of the annular duct is connected to a compressed air network. Multiple jet air knives are arranged in a ring on the inner side of the annular duct, blowing air towards the surface of the heat pipe, to form an isolation air curtain on the surface of the heat pipe that can dry residual water droplets.

5. The spray coating and winding device for small-diameter cast iron insulation pipes according to claim 1, characterized in that: The front and rear ends of the horizontal rotating shaft are rotatably connected to the roller bracket through rotary bearings. The transmission mechanism is a dual-output shaft reducer that can simultaneously drive the two horizontal rotating shafts to rotate synchronously in the same direction.

6. The spray coating and winding device for small-diameter cast iron insulation pipes according to claim 5, characterized in that: The two output ends of the dual-output shaft reducer are respectively coaxially fixed to the two horizontal rotating shafts through couplings. The motor base of the drive motor is fixedly connected to the support base. The motor shaft of the drive motor is fixedly connected to the input end of the dual-output shaft reducer. The drive motor and the dual-output shaft reducer are fitted with protective covers on their outer sides.

7. The spray coating and winding device for small-diameter cast iron insulation pipes according to claim 1, characterized in that: The spiral roller and the spiral protrusion are integrally formed spiral rubber rollers. Multiple spiral rubber rollers are coaxially connected on the same horizontal rotating shaft. Each spiral rubber roller is provided with a roller support. The horizontal rotating shaft between each spiral rubber roller is rotatably connected to the roller support through a rotary bearing.

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