Nodular cast iron prefabricated thermal insulation pipe machining device

Abstract

The utility model relates to a nodular cast iron prefabricated thermal insulation pipe machining device in the field of thermal insulation pipeline production, which comprises a steel pipe feeding platform, a spraying transmission line, a polyurethane spraying device, a winding transmission line, a polyethylene winding device, a water spray cooling bin and a turnover discharging platform. The water-cooling roller is positioned on the lower side right in front of an extrusion opening of the extruder; the water-cooling roller is of a hollow roller structure, hollow rotating shafts at the two ends of the water-cooling roller are connected with a water inlet pipe and a water outlet pipe through rotating joints, and the water-cooling roller is rotationally installed on the supporting seat assembly through a bearing seat. The supporting seat assembly comprises a base, a support, an overturning table and an overturning air cylinder and is used for driving the overturning table to overturn, a driving motor is fixedly connected to the lower portion of the overturning table, and the water cooling roller is in transmission connection with the driving motor. According to the thermal insulation pipe processing device, corresponding technical transformation is mainly carried out on polyethylene winding processing equipment, and the spiral winding bonding effect and the air tightness detection qualification rate of a polyethylene winding layer of the thermal insulation pipe can be effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal insulation pipe production, and in particular relates to a ductile iron prefabricated thermal insulation pipe processing device. Background Art

[0002] Insulated pipes are usually called thermal pipes. Their structure is generally composed of a working steel pipe and a layer of insulation material covering the outside of the steel pipe. According to the material of the working steel pipe, prefabricated insulated pipes can be divided into ductile iron prefabricated insulated pipes and seamless steel pipe prefabricated insulated pipes. Ductile iron has both the essence of iron and the properties of steel, so ductile iron prefabricated insulated pipes also have relatively excellent pipeline performance. In recent years, they have been widely praised by market users. At present, most ductile iron prefabricated insulation pipes adopt the structure of polyurethane sprayed polyethylene wrapped insulation pipe. The production process of the insulation pipe requires multiple processing steps. The equipment of the insulation pipe production line is of various types and the equipment layout is complex. The main processing device of the polyethylene winding process is the extruder. The high-temperature polyethylene from the traditional extruder is generally directly cooled by immersion in water to form a polyethylene winding tape. However, this cooling method is not very suitable for the polyethylene winding process of the insulation pipe. There may be water droplets remaining on the polyethylene winding tape after immersion in water for cooling, which will affect the bonding effect of the joints during spiral winding, resulting in poor bonding effect and sealing of the polyethylene winding. The subsequent polyethylene winding layer is prone to unqualified air tightness detection or water seepage and moisture accelerated corrosion during the operation of the insulation pipe. Therefore, it is urgent to carry out corresponding technical transformation of the polyethylene winding processing device of the insulation pipe to avoid similar problems. Utility Model Content

[0003] In view of the above situation, the utility model provides a ductile iron prefabricated insulation pipe processing device, which mainly carries out corresponding technical transformation of the polyethylene winding processing equipment, and can effectively improve the spiral winding bonding effect and air tightness detection pass rate of the polyethylene winding layer of the insulation pipe.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A ductile iron prefabricated insulation pipe processing device comprises a steel pipe loading platform, a spraying transmission line, a polyurethane spraying device, a winding transmission line, a polyethylene winding device, a water spray cooling bin and a turning unloading platform which are arranged on the processing production line in sequence from front to back according to the conveying direction of the pipeline.

[0006] The polyethylene winding device includes an extruder for extruding the polyethylene winding tape and a water-cooled roller for cooling and shaping the polyethylene winding tape, wherein the water-cooled roller is located at the lower side just in front of the extrusion port of the extruder; the water-cooled roller is a hollow drum structure, and the hollow cavity is used for circulating cooling water. Preferably, the water-cooled roller is made of stainless steel, which ensures good thermal conductivity while also having good rust and corrosion resistance.

[0007] The two ends of the water-cooled roller are coaxially fixed with a hollow rotating shaft connected to the hollow inner cavity of the water-cooled roller. The two hollow rotating shafts are respectively used as inlet and outlet channels for cooling water to enter and flow out of the water-cooled roller. The water-cooled roller is rotatably mounted above the support seat assembly.

[0008] The support seat assembly includes a base, two brackets, a turning table and a turning cylinder. The two brackets are vertically fixed to the front and rear ends of the upper left side of the base. The front and rear ends of the left side of the turning table are rotatably hinged to the upper ends of the two brackets respectively through hinge seats three. The right side of the turning table is swingably mounted above the base through a turning cylinder; the two hollow rotating shafts of the water-cooled roller are rotatably mounted above the turning table through bearing seats. Preferably, the bearing seats are vertical external spherical bearing seats.

[0009] A motor mounting frame is fixedly connected to the bottom of the turning table, and a driving motor is installed on the motor mounting frame. One of the hollow rotating shafts of the water-cooled roller is transmission-connected to the driving motor through a transmission assembly, and the outer ends of the two hollow rotating shafts of the water-cooled roller are respectively connected to a water inlet pipe and a water outlet pipe through rotating joints.

[0010] Furthermore, an electromagnetic induction heating ring is provided at the front end of the polyurethane spraying device, and the steel pipe can be heated by electromagnetic induction when the steel pipe passes through the ring.

[0011] Furthermore, a pipe end cutting saw is also provided at the rear end of the water spray cooling bin for cutting and stripping the end of the insulation pipe after being wrapped with polyurethane sprayed polyethylene.

[0012] Furthermore, the transmission assembly includes a driven wheel arranged on one of the hollow rotating shafts of the water-cooled roller, a driving wheel arranged on the output shaft of the driving motor, and a transmission belt connected between the driving and driven wheels, and a protective cover is also arranged on the outside of the transmission assembly.

[0013] Furthermore, the bottom of the cylinder seat of the flip cylinder is rotatably hinged to the middle right side of the base through hinge seat 1, and the top of the piston rod of the flip cylinder is rotatably hinged to the middle right side of the flip table through hinge seat 2. The telescopic movement of the flip cylinder can drive the flip table and the water-cooled roller to perform a fan-shaped flipping movement.

[0014] Furthermore, the base is a rectangular frame structure, and adjustable anchor screws are arranged under the four corners to achieve height adjustment and balance adjustment of the base.

[0015] The utility model also includes other components that enable it to be used normally, which are all conventional means in the field. In addition, devices or components not limited in the utility model, such as: steel pipe feeding platform, spray transmission line, electromagnetic induction heating ring, polyurethane spray device, winding transmission line, water cooling bin, pipe end cutting saw and flip unloading platform, as well as electromagnetic induction heating ring, pipe end cutting saw, rotary joint, flip cylinder, drive motor, transmission belt, bearing seat and various articulated seats, etc., all adopt the existing technology in the field.

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

[0017] The ductile iron prefabricated insulation pipe processing device mainly carries out corresponding technical transformation on the polyethylene winding processing equipment, adopts water-cooling rollers to realize the cooling and shaping of the polyethylene spiral winding tape extruded by the extruder, and no water droplets will remain on the inner side of the winding tape, thereby ensuring the bonding and sealing effect of the joints when the winding tape is spirally wound, and can effectively improve the air tightness of the polyethylene winding layer of the insulation pipe, thereby solving the problems of unqualified air tightness detection of the subsequent polyethylene winding layer, and water seepage, moisture and corrosion of the insulation pipe during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the ductile iron prefabricated insulation pipe processing device in the embodiment.

[0019] Figure 2 for Figure 1 Schematic diagram of the front view of the water-cooled rollers of the polyethylene winding device.

[0020] Figure 3 for Figure 2 Side view of the water-cooled roller. DETAILED DESCRIPTION

[0021] The technical solution of the present utility model will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments.

[0022] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and the like indicating directions or positional relationships are based on the accompanying drawings and are only for the convenience of description.

[0023] Example

[0024] like Figure 1As shown, a ductile iron prefabricated insulation pipe processing device includes a steel pipe feeding platform 1, a spraying transmission line 2, a polyurethane spraying device 3, a winding transmission line 4, a polyethylene winding device 5, a water spray cooling bin 6 and a turning unloading platform 7, which are arranged in sequence from front to back according to the conveying direction of the pipeline 10. The steel pipe feeding platform, the spraying transmission line, the polyurethane spraying device, the winding transmission line, the water spray cooling bin and the turning unloading platform all adopt the existing technology, such as the first feeding platform, the spraying transmission line, the double-gun spraying device, the winding transmission line, the spray cooling device, etc. in a variable-diameter polyurethane continuous spray polyethylene winding insulation pipe production line disclosed in the patent document of publication number CN116872480B, all of which belong to the existing technology in this field, and the specific settings are not repeated here.

[0025] The front end of the polyurethane spraying device is also provided with an electromagnetic induction heating ring 8, through which the steel pipe can be heated by electromagnetic induction when passing through it, and the heated steel pipe surface is more convenient for better adsorption of the sprayed polyurethane foam. The electromagnetic induction heating ring belongs to the prior art in this field, and the specific configuration is not repeated here.

[0026] The rear end of the water spray cooling bin is also provided with a pipe end cutting saw 9, which is used to cut and strip the end of the insulation pipe after being wrapped with polyurethane spray polyethylene. The end of the insulation pipe needs to be stripped to expose about 15 cm of the steel pipe to facilitate the butt welding between the pipes during the subsequent laying of the thermal pipeline.

[0027] The pipe end cutting saw adopts the existing technology, such as a cutting device in a variable diameter polyurethane continuous spray polyethylene winding insulation pipe production line disclosed in patent document publication number CN116872480B, which belongs to the existing technology in this field and the specific setting is not repeated here.

[0028] The polyethylene winding device includes an extruder 51 for extruding the polyethylene winding tape 11 and a water-cooled roller 52 for cooling and shaping the polyethylene winding tape. The extruder can heat and melt the polyethylene granular raw material, and then extrude it from the flat extrusion port at the end of the extruder under the spiral extrusion force of the extrusion screw, and evenly spread it on the surface of the water-cooled roller. Then, the high-temperature molten polyethylene flat layer is quickly cooled and shaped on the surface of the water-cooled roller to become a polyethylene winding tape. At the same time, the surface of the side of the shaped polyethylene winding tape away from the water-cooled roller also has a relatively high temperature and high viscosity, which is conducive to better adhesion at the winding joint during the winding process to the outside of the pipeline insulation layer 12. The polyethylene winding tape does not directly contact the cooling water from the extruder to the cooling and shaping, and there will be no water droplets remaining on the surface of the winding tape, which is also conducive to the reliable adhesion of the winding tape. Therefore, the air tightness of the wound polyethylene waterproof layer will be better.

[0029] The extruder adopts existing technology, such as a polyethylene winding extruder in a polyurethane spray polyethylene winding insulation pipe production line disclosed in patent document publication number CN106273528A, which belongs to the existing technology in this field and the specific settings are not repeated here.

[0030] The water-cooling roller is located at the lower side directly in front of the extrusion port 512 of the extruder; the water-cooling roller is a hollow roller structure made of stainless steel and has good thermal conductivity and corrosion resistance.

[0031] like Figure 2 and 3 As shown, two ends of the water-cooling roller are coaxially fixed with a hollow rotating shaft connected to the hollow inner cavity of the water-cooling roller, and the water-cooling roller is rotatably installed above the support seat assembly.

[0032] The support seat assembly includes a base 521, two brackets 522, a turning table 523 and a turning cylinder 524. The two brackets are vertically welded to the front and rear ends of the upper left side of the base. The front and rear ends of the left side of the turning table are rotatably hinged to the upper ends of the two brackets through hinge seats 525 respectively. The right side of the turning table is swingably mounted above the base through a turning cylinder; the two hollow rotating shafts of the water-cooled roller are rotatably mounted above the turning table through vertical outer spherical bearing seats 526.

[0033] A motor mounting frame 527 is fixedly welded at the bottom of the turning table, and a driving motor 528 is installed on the motor mounting frame. One of the hollow rotating shafts of the water-cooled roller is connected to the driving motor through a transmission assembly. The outer ends of the two hollow rotating shafts of the water-cooled roller are respectively connected to a water inlet pipe 530 and a water outlet pipe 531 through a rotating joint 529. The rotating joint can realize the rotating seal of the flowing water between the water inlet and outlet pipes and the hollow rotating shafts at both ends of the water-cooled roller.

[0034] The transmission assembly adopts a belt drive structure, including a driven wheel 532 arranged on one of the hollow rotating shafts of the water-cooled roller, a driving wheel 533 arranged on the output shaft of the driving motor, and a transmission belt 534 connected between the driving and driven wheels. A protective cover 535 is also provided on the outside of the transmission assembly to provide safety protection for the rotating parts of the machine.

[0035] The bottom of the cylinder seat of the flip cylinder is rotatably hinged to the middle right side of the base through an articulated seat 1 536, and the top of the piston rod of the flip cylinder is rotatably hinged to the middle right side of the flip table through an articulated seat 2 537. The flip table and the water-cooled roller can be driven to perform a fan-shaped flipping movement through the telescopic movement of the flip cylinder. When the flip table is fan-shaped outward, the water-cooled roller can be temporarily away from the outer surface of the pipeline; when the flip table is fan-shaped inward, the water-cooled roller rolls and presses against the outer surface of the pipeline insulation layer to spirally wrap the polyethylene wrapping tape. At the same time, the wrapping and extrusion force of the water-cooled roller on the pipeline insulation layer can also be adjusted by the flip cylinder to ensure the compression and bonding of the spirally wrapped joints of the polyethylene wrapping tape to ensure the air tightness of the polyethylene wrapping layer.

[0036] The base is a rectangular frame structure, and adjustable anchor screws 538 are arranged under the four corners. By adjusting the protruding length of the anchor screws, the height and balance of the base can be adjusted, which also helps to adjust the effective distance between the water-cooled roller and the outer surface of the pipeline insulation layer, and the auxiliary turning platform can better realize the rolling spiral winding of the water-cooled roller on the polyethylene winding belt.

[0037] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. Without departing from the scope and spirit of the described embodiments, many modifications and changes are obvious to ordinary technicians in this technical field. Any technical deformation made within the spirit and principles of the present invention falls within the protection scope of the present invention.

Claims

1. A ductile iron prefabricated insulation pipe processing device, comprising a steel pipe feeding platform, a spraying transmission line, a polyurethane spraying device, a winding transmission line, a polyethylene winding device, a water cooling bin and a turning unloading platform arranged in sequence from front to back, characterized in that: The polyethylene winding device comprises an extruder and a water-cooled roller, the water-cooled roller is located at the lower side just in front of the extrusion port of the extruder; the water-cooled roller is a hollow drum structure, and the two ends of the water-cooled roller are respectively coaxially fixed with a hollow rotating shaft connected to the hollow inner cavity of the water-cooled roller, and the water-cooled roller is rotatably installed above the support seat assembly; the support seat assembly comprises a base, a bracket, a turning table and a turning cylinder, the bracket is vertically fixed to the upper left side of the base, the left side of the turning table is rotatably hinged with the upper end of the bracket, and the right side of the turning table is swingably mounted above the base through the turning cylinder; the two hollow rotating shafts of the water-cooled roller are rotatably mounted above the turning table through a bearing seat, a motor mounting frame is fixedly connected below the turning table, and a driving motor is installed on the motor mounting frame, one of the hollow rotating shafts of the water-cooled roller is connected to the driving motor through a transmission assembly, and the outer ends of the two hollow rotating shafts of the water-cooled roller are respectively connected to a water inlet pipe and a water outlet pipe through a rotating joint.

2. A ductile iron prefabricated insulation pipe processing device according to claim 1, characterized in that: The front end of the polyurethane spraying device is also provided with an electromagnetic induction heating ring.

3. A ductile iron prefabricated insulation pipe processing device according to claim 1, characterized in that: The rear end of the water cooling bin is also provided with a pipe end cutting saw.

4. A ductile iron prefabricated insulation pipe processing device according to claim 1, characterized in that: The transmission assembly includes a driven wheel arranged on one of the hollow rotating shafts of the water-cooled roller, a driving wheel arranged on the output shaft of the driving motor, and a transmission belt connected between the driving and driven wheels, and a protective cover is also arranged on the outside of the transmission assembly.

5. The ductile iron prefabricated insulation pipe processing device according to claim 1 is characterized in that: The bottom of the cylinder seat of the turning cylinder is rotatably hinged to the middle right side of the base through a hinge seat 1, and the top of the piston rod of the turning cylinder is rotatably hinged to the middle right side of the turning platform through a hinge seat 2.

6. A ductile iron prefabricated insulation pipe processing device according to claim 1, characterized in that: The base is a rectangular frame structure, and adjustable anchor screws are arranged under the four corners.

7. The ductile iron prefabricated insulation pipe processing device according to claim 1 is characterized in that: The bearing seat is a vertical external spherical bearing seat.

8. The ductile iron prefabricated insulation pipe processing device according to claim 1 is characterized in that: The water-cooling roller is made of stainless steel.

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