A support-free foamed heat-insulating pipe preparation device

Abstract

This utility model relates to a supportless foamed insulation pipe preparation device in the field of insulation pipe production technology. The working steel pipe of the insulation pipe passes coaxially through the working pipe conveying mechanism, the extruder head of the extruder, the cooling water spraying mechanism, and the outer sheath traction mechanism from front to back. An extrusion cavity is sandwiched between the inner and outer extrusion molds of the extruder head. An inlet is provided on the side wall of the outer extrusion mold, and an extrusion outlet is provided at the rear end of the extrusion cavity. A hollow water-cooling jacket is coaxially fitted inside the inner extrusion mold, and an insulating isolation wall is provided around the rear side of the hollow water-cooling jacket. The front end of the insulation layer foaming adhesive spraying pipe is externally connected to the spray head of the foaming adhesive spraying device, and the rear end of the insulation layer foaming adhesive spraying pipe extends into the interlayer cavity between the working steel pipe and the extrusion pipe. This device solves the problems of "asynchronous operation between the outer sheath and the working pipe and unsatisfactory foaming effect" existing in the production equipment of supportless foamed insulation pipes, eliminating potential product quality and safety hazards.

Description

Technical Field

[0001] This utility model belongs to the field of thermal insulation pipe production technology, specifically relating to a supportless foamed thermal insulation pipe preparation device. Background Technology

[0002] Thermal pipelines commonly use insulated pipes. Insulated pipes are mainly divided into overhead pipelines and direct-buried pipelines according to their installation method, and into steel-jacketed steel insulated pipes and plastic-jacketed steel insulated pipes according to their structural form. The general structure of an insulated pipe consists of a working steel pipe (referred to as the working pipe), an insulation layer, and an outer sheath, from the inside out. Common types of plastic-jacketed steel insulated pipes include polyurethane sprayed polyethylene spiral insulated pipes and supportless foamed insulated pipes. Among the various methods for manufacturing supportless foamed insulation pipes, the most advanced is the "one-step" production process. This process involves molding the insulation layer and outer sheath in a single step. In this method, the working steel pipe cannot be spiral-driven; instead, it uses a V-shaped roller drive for linear conveying. The outer sheath is extruded using a plastic extruder and coaxially sleeved on the outside of the working pipe. Polyurethane foam is sprayed and filled into the cavity between the working pipe and the outer sheath. This production method offers advantages such as high efficiency and small footprint. However, existing supportless foamed insulation pipe production equipment suffers from several drawbacks. These include uneven sheath thickness due to poor synchronization between the outer sheath and the central working pipe, and poor hardening of the polyurethane foam in the insulation layer, leading to clumping and voids. All of these issues contribute to product quality problems. Therefore, there is an urgent need to improve and refine the existing supportless foamed insulation pipe manufacturing equipment. Utility Model Content

[0003] In view of the above situation, this utility model provides a supportless foamed insulation pipe preparation device, which mainly solves the technical problems of "outer sheath and working pipe not being synchronized and the insulation layer foaming effect being unsatisfactory" in the existing supportless foamed insulation pipe production equipment in the background art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A supportless foamed insulation pipe preparation device includes a working steel pipe, an extruder, an insulation layer foaming adhesive spray pipe, a working pipe conveying mechanism for conveying the working steel pipe, a cooling water spraying mechanism for cooling the extruded pipe of the extruder, and an outer sheath traction mechanism for pulling the extruded pipe.

[0006] According to the direction of travel of the insulation pipe, the working steel pipe passes through the working pipe conveying mechanism, the extrusion head of the extruder, the cooling water spraying mechanism and the outer sheath traction mechanism in sequence from front to back. The extrusion head of the extruder is composed of an inner extrusion die and an outer extrusion die that are coaxially fitted together. An extrusion cavity is sandwiched between the inner and outer extrusion dies. A feed port communicating with the extrusion cavity is opened on the side wall of the outer extrusion die. An extrusion port is provided at the rear end of the extrusion cavity.

[0007] The inner side of the inner extrusion mold is coaxially fitted with a hollow water-cooled jacket for rapid cooling and shaping of the extrusion tube. The upper and lower sides of the front end of the hollow water-cooled jacket are respectively provided with a cooling water outlet and a cooling water inlet. An insulating isolation wall is provided around the rear side of the hollow water-cooled jacket. The front end of the insulation layer foaming adhesive spraying pipe is externally connected to the spray head of the foaming adhesive spraying device. The rear end of the insulation layer foaming adhesive spraying pipe passes through the insulating isolation wall and extends into the interlayer cavity between the rear working steel pipe and the extrusion tube, for spraying and filling foaming adhesive insulation material into the interlayer cavity.

[0008] Furthermore, both the working pipe conveying mechanism and the outer sheath traction mechanism adopt a hexagonal V-shaped roller transmission mechanism. The hexagonal V-shaped roller transmission mechanism includes a vertically arranged mounting frame with a central hole in the middle. Six V-shaped rollers are evenly distributed around the outer periphery of the central hole. Each V-shaped roller is rotatably mounted on one side of the mounting frame via a roller frame.

[0009] Furthermore, each of the V-shaped rollers has a roller shaft fixedly connected to both ends. Each roller shaft is rotatably connected to the mounting frame via a rolling bearing. The roller shafts of the six V-shaped rollers are connected in series in an open-loop manner via universal joints. A drive pulley is mounted on one end of the roller shaft of one of the V-shaped rollers. A power motor is fixedly mounted on the mounting frame, and a drive pulley is mounted on the output shaft of the power motor. The drive pulley and the drive pulley are connected by a drive belt. Preferably, the drive belt is a ring-shaped synchronous belt.

[0010] Furthermore, the outer surface of each of the V-shaped rollers is covered with a rubber anti-slip layer to increase the friction between the rollers and the working steel pipe or the outer sheath extrusion pipe, thereby further improving the reliability of the hexagonal fully enclosed V-shaped rollers for pipeline transmission and conveying.

[0011] Furthermore, the two power motors corresponding to the working pipe conveying mechanism and the outer sheath traction mechanism can be interlocked through the system electrical control cabinet, which is mainly used to coordinate the consistency of the travel speed of the working steel pipe and the outer sheath extrusion pipe.

[0012] Furthermore, the cooling water spraying mechanism adopts a spiral coil type spraying mechanism, which includes a horizontally placed spiral coil, and a plurality of spray holes are evenly opened on the inner side wall of the spiral coil. Preferably, each spray hole is also equipped with a corresponding spray head.

[0013] Furthermore, an electrostatic collection block is provided on the rear side of the insulating isolation wall to collect the static electricity generated on the extrusion tube. The electrostatic conduction ring is connected to an electrostatic conduction line, and the outer end of the electrostatic conduction line is connected to an external grounding point to conduct the static electricity collected by the electrostatic collection block away.

[0014] Furthermore, a temperature sensor is embedded within the insulating wall to detect the real-time temperature of the extrusion tube. The temperature sensor transmits the detected extrusion tube temperature to the system control cabinet in real time. By detecting the setting temperature of the extrusion tube, the temperature sensor facilitates comprehensive adjustment of the operating state of the downstream cooling water spray mechanism.

[0015] 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: working steel pipe, foaming adhesive spraying device, extruder and its inner and outer extrusion molds, as well as system electrical control cabinet and its internal control circuit system settings, all adopt the prior art in the field.

[0016] The beneficial effects of this utility model are as follows:

[0017] The supportless foamed insulation pipe preparation device provided by this utility model not only perfectly retains the advantages of the "one-step" production system, such as high production efficiency and small footprint, but also effectively overcomes the problems of "outer sheath and working pipe not being synchronized and the insulation layer foaming effect being unsatisfactory" in the existing supportless foamed insulation pipe production equipment, which leads to product quality and safety hazards. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the supportless foamed insulation pipe preparation device in the embodiment;

[0019] Figure 2 for Figure 1 A three-dimensional structural diagram of a hexagonal V-shaped roller transmission mechanism along the AA direction. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0021] It should be noted that the terms "upper," "lower," "front," "back," "inner," and "outer," which indicate direction or positional relationship, are based on the attached drawings and are used only for ease of description.

[0022] Example

[0023] like Figure 1-2 As shown, a supportless foamed insulation pipe preparation device includes a working steel pipe 1, an extruder, an insulation layer foaming adhesive spray pipe 2, a working pipe conveying mechanism for conveying the working steel pipe, a cooling water spraying mechanism for cooling the extruded pipe of the extruder, and an outer sheath traction mechanism for pulling the extruded pipe.

[0024] According to the direction of travel of the insulation pipe, the working steel pipe passes through the working pipe conveying mechanism, the extrusion head of the extruder, the cooling water spraying mechanism and the outer sheath traction mechanism in sequence from front to back. The extrusion head of the extruder is composed of an inner extrusion die 3 and an outer extrusion die 4 coaxially fitted together. An extrusion cavity 5 is sandwiched between the inner and outer extrusion dies. A feed port 6 communicating with the extrusion cavity is opened on the side wall of the outer extrusion die. An extrusion port 7 is provided at the rear end of the extrusion cavity.

[0025] The inner side of the internal extrusion mold is coaxially fitted with a hollow water-cooled jacket 8 for rapid cooling and shaping of the extrusion tube. Cooling outlets 9 and cooling inlets 10 are respectively located on the upper and lower sides of the front end of the hollow water-cooled jacket. An insulating isolation wall 11 is circumferentially arranged on the rear side of the hollow water-cooled jacket. The front end of the insulation layer foaming adhesive injection pipe is externally connected to the injection head 12 of the foaming adhesive injection device (not shown in the figure). The rear end of the insulation layer foaming adhesive injection pipe extends through the insulating isolation wall into the interlayer cavity 13 between the rear working steel pipe and the extrusion tube, for spraying and filling the interlayer cavity with foaming adhesive insulation material. The foaming adhesive injection device is used to provide liquid foaming adhesive material, which includes isocyanate, polyether polyol, catalyst, and compressed air, etc. Both the foaming adhesive injection device and the foaming adhesive material adopt existing technology and will not be described in detail here.

[0026] Specifically, both the working pipe conveying mechanism and the outer sheath traction mechanism adopt a hexagonal V-shaped roller transmission mechanism. The hexagonal V-shaped roller transmission mechanism includes a vertically arranged mounting frame 14 with a central hole in the middle. Six V-shaped rollers 15 are evenly distributed around the outer periphery of the central hole. Each V-shaped roller is rotatably mounted on the same side surface of the mounting frame via a roller frame 16.

[0027] Specifically, each of the V-shaped rollers has a roller shaft 17 fixedly connected to both ends. Each roller shaft is rotatably connected to the mounting frame via a rolling bearing. The roller shafts of the six V-shaped rollers are connected in an open-loop series transmission via universal joints 18. A transmission pulley 19 is mounted on one end of the roller shaft of one of the V-shaped rollers. A power motor 20 is fixedly mounted on the mounting frame, and a drive pulley 21 is mounted on the output shaft of the power motor. The transmission pulley and the drive pulley are connected by a ring-shaped synchronous belt 22. The universal joint, also known as a universal coupling, enables the transmission connection between two roller shafts that are not on the same axis. This is existing technology and will not be described in detail here.

[0028] Specifically, each of the V-shaped rollers has a roller structure that is thinner in the middle and thicker at both ends, and the outer surface of the roller is covered with a rubber anti-slip layer to increase the friction between it and the working steel pipe or the outer sheath extrusion pipe, thus preventing slippage during V-shaped roller conveying. In the prior art, the open V-shaped roller drive conveying pipeline may experience slippage between the roller surface and the pipe surface, which can easily lead to a mismatch between the conveying speeds of the extrusion pipe and the working steel pipe.

[0029] Specifically, the two power motors corresponding to the working pipe conveying mechanism and the outer sheath traction mechanism can be interlocked and controlled through a system electrical control cabinet (not shown in the figure), mainly to coordinate the consistency of the travel speed of the working steel pipe and the outer sheath extrusion pipe. The system electrical control cabinet is an existing electrical control cabinet used in the insulated pipe preparation system, which is prior art and will not be described in detail here.

[0030] Specifically, the cooling water spraying mechanism adopts a spiral coil spraying mechanism, which includes a horizontally placed spiral coil. Several spray holes are evenly opened on the inner side wall of the spiral coil, and a spray head is also installed on each spray hole to pressurize and make the sprayed water more evenly dispersed.

[0031] Specifically, an electrostatic collection block 23 is also provided on the rear side of the insulating isolation wall to collect the static electricity generated on the extrusion tube. The electrostatic conduction ring is connected to an electrostatic conduction line 24, and the outer end of the electrostatic conduction line is connected to an external grounding point to conduct the static electricity collected by the electrostatic collection block away, thereby avoiding the risk of electrostatic sparks generated during the extrusion of the plastic tube by the extruder, which may ignite the foam insulation material in the insulation layer cavity.

[0032] Specifically, a temperature sensor 25 is embedded within the insulating wall to detect the real-time temperature of the extrusion tube. The temperature sensor transmits the detected extrusion tube temperature to the system control cabinet in real time via a signal transmission line 26. By detecting the setting temperature of the extrusion tube, the temperature sensor comprehensively determines whether the subsequent spiral coil needs further water spraying for cooling, and controls the required amount of spraying water. This operation is also automatically adjusted by the system control cabinet.

[0033] The technical solution of this utility model is not limited to the specific embodiments described above. Without departing from the scope and spirit of the described embodiments, many modifications and changes will be obvious to those skilled in the art. Any technical modifications made within the spirit and principles of this utility model shall fall within the protection scope of this utility model.

Claims

1. A supportless foamed insulation pipe preparation apparatus, comprising a working steel pipe, an extruder, and an insulation layer foaming adhesive spraying pipe, characterized in that: It also includes a working pipe conveying mechanism for conveying the working steel pipe, a cooling water spraying mechanism for cooling the extrusion pipe of the extruder, and an outer sheath traction mechanism for pulling the extrusion pipe; according to the travel direction of the insulation pipe, the working steel pipe passes coaxially through the working pipe conveying mechanism, the extrusion head of the extruder, the cooling water spraying mechanism, and the outer sheath traction mechanism from front to back; the extrusion head of the extruder consists of an inner extrusion die and an outer extrusion die coaxially fitted together, with an extrusion cavity sandwiched between the inner and outer extrusion dies; the side wall of the outer extrusion die has a feed port communicating with the extrusion cavity. An extrusion port is provided at the rear end of the cavity. A hollow water-cooled jacket for rapid cooling and shaping of the extrusion tube is coaxially sleeved on the inner side of the inner extrusion mold. Cooling water outlet and cooling water inlet are respectively provided on the upper and lower sides of the front end of the hollow water-cooled jacket. An insulating isolation wall is provided around the rear side of the hollow water-cooled jacket. The front end of the insulation layer foaming adhesive spraying pipe is externally connected to the spray head of the foaming adhesive spraying device. The rear end of the insulation layer foaming adhesive spraying pipe extends through the insulating isolation wall into the interlayer cavity between the rear working steel pipe and the extrusion tube, for spraying and filling foaming adhesive insulation material into the interlayer cavity.

2. The apparatus for preparing a supportless foamed insulation pipe according to claim 1, characterized in that: Both the working pipe conveying mechanism and the outer sheath traction mechanism adopt a hexagonal V-shaped roller transmission mechanism. The hexagonal V-shaped roller transmission mechanism includes a vertically mounted mounting frame with a central hole in the middle. Six V-shaped rollers are evenly distributed around the outer periphery of the central hole. Each V-shaped roller is rotatably mounted on one side of the mounting frame via a roller frame.

3. The apparatus for preparing a supportless foamed insulation pipe according to claim 2, characterized in that: Each of the V-shaped rollers has a roller shaft fixedly connected to both ends. Each roller shaft is rotatably connected to the mounting frame via a rolling bearing. The roller shafts of the six V-shaped rollers are connected in series in an open-loop manner via universal joints. A drive pulley is installed on one end of the roller shaft of one of the V-shaped rollers. A power motor is fixedly installed on the mounting frame. A drive pulley is installed on the output shaft of the power motor. The drive pulley and the drive pulley are connected by a drive belt.

4. The apparatus for preparing a supportless foamed insulation pipe according to claim 3, characterized in that: The transmission belt is a ring-shaped synchronous belt.

5. The apparatus for preparing a supportless foamed insulation pipe according to claim 3, characterized in that: The outer surface of each of the V-shaped rollers is covered with a rubber anti-slip layer.

6. The apparatus for preparing a supportless foamed insulation pipe according to claim 3, characterized in that: The two power motors corresponding to the working pipe conveying mechanism and the outer sheath traction mechanism can be interlocked.

7. The apparatus for preparing a supportless foamed insulation pipe according to claim 1, characterized in that: The cooling water spraying mechanism adopts a spiral coil type spraying mechanism, which includes a horizontally placed spiral coil, and a number of spray holes are evenly opened on the inner side wall of the spiral coil.

8. The apparatus for preparing a supportless foamed insulation pipe according to claim 7, characterized in that: Each of the aforementioned water spray holes is equipped with a corresponding water spray head.

9. The apparatus for preparing a supportless foamed insulation pipe according to claim 1, characterized in that: An electrostatic collection block is also provided on the rear side of the insulating isolation wall to collect the static electricity generated on the extrusion tube. The electrostatic conduction ring is connected to an electrostatic conduction line to conduct the static electricity collected by the electrostatic collection block away.

10. The apparatus for preparing a supportless foamed insulation pipe according to claim 1, characterized in that: A temperature sensor is also embedded in the insulating wall to detect the real-time temperature of the extrusion tube.

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