CN106113353B - Large-diameter steel pipe plastic-coated equipment - Google Patents

Abstract

The invention discloses a plastic-coating equipment for large-diameter steel pipes. A walking frame driven by a power unit, the walking frame is provided with an outer plastic coating device and an inner plastic coating device, the inner plastic coating device is located below the outer plastic coating device, and the outer plastic coating device includes a powder trough , the powder trough is fixed on the walking frame, the discharge port of the powder trough is provided with a gate driven by a power device, the inner plastic coating device includes a turning shaft, and the turning shaft rotates Installed on the walking frame, one end of the turning shaft is connected with a turning drive mechanism, and the other end is fixedly connected with a turning hopper that can axially extend into the steel pipe. The equipment can simultaneously carry out internal and external plastic coating on large-diameter steel pipes, with fast coating speed, uniform coating of steel pipes and high powder recovery rate.

Description

Large diameter steel pipe plastic coating equipment

technical field

The invention relates to the technical field of plastic-coating equipment for large-diameter steel pipes, in particular to plastic-coating equipment for large-diameter steel pipes.

Background technique

The inner and outer plastic-coated steel pipes are made by melting a layer of polyethylene (PE) resin, ethylene-acrylic acid copolymer (EAA), epoxy (EP) powder, non-toxic polypropylene (PP) or non-toxic polyvinyl chloride (PVC) on the steel pipe wall. ) and other organic substances, the plastic-coated steel pipe not only has the advantages of high strength, easy connection, and water impact resistance, but also overcomes the corrosion, pollution, scaling and low strength of the plastic pipe , poor fire performance and other shortcomings.

Large-diameter steel pipes generally refer to steel pipes with a nozzle diameter of 300mm to 2400mm, which can be coated with plastic coatings with different properties such as polyvinyl chloride (PVC), polyethylene (PE), epoxy resin (EPOZY), etc. Floor. Plastic-coating large-diameter steel pipes can reduce the conveying resistance of steel pipes, improve flow and conveying efficiency, and reduce conveying pressure loss. Large-diameter coated steel pipes are widely used in tap water, natural gas, petroleum, chemical industry, medicine, communication, electric power, marine and other engineering fields.

Chinese utility model patent CN203316338 discloses a new intelligent automatic steel pipe inner and outer plastic coating production line, which consists of a feeding device, a preheating device, an outer shot blasting device, an inner shot blasting device, an inner plastic coating device, an outer plastic coating device, It is composed of plastic coating curing device, electric spark detection device, coding device, finished product packaging device and central console. When the production line is used to plastic-coat the steel pipe inside and outside, the inner coating process and the outer coating process of the steel tube need to be carried out successively, so it takes a long time.

Contents of the invention

The technical problem to be solved by the present invention is to provide a plastic coating equipment for large-diameter steel pipes, which can simultaneously perform internal and external plastic coating on large-diameter steel pipes, with fast coating speed, uniform coating of steel pipes, and high powder recovery rate.

In order to solve the above technical problems, the technical solution of the present invention is: a large-diameter steel pipe plastic coating equipment, including a bottom frame, the bottom frame is provided with a steel pipe rotation device, the guide rail and the rotation axis of the steel pipe supported by the steel pipe rotation device Arranged in parallel, the guide rail is provided with a walking frame driven by a power device, and the walking frame is provided with an outer plastic coating device and an inner plastic coating device, and the inner plastic coating device is located below the outer plastic coating device. The outer plastic coating device includes a powder trough fixed to the walking frame, and a shutter driven by a power device is provided at the discharge port of the powder trough. The inner plastic coating device includes a material turning shaft, which is rotatably mounted on the walking frame, one end of the material turning shaft is connected with a turning drive mechanism, and the other end is fixedly connected with a steel pipe that can axially extend into the steel pipe The turning hopper inside; the turning drive mechanism includes a gear, a rack and a cylinder, the gear is connected to the turning shaft, the rack is slidably installed on the walking frame and meshed with the gear, and the cylinder connected between the rack and the walking frame;

The steel pipe rotating device has two groups, which are used to support the two ends of the steel pipe, and each group of the steel pipe rotating device includes a supporting seat, and the supporting seat is installed on the base frame, and the supporting seat is rotatably installed with There are at least two rollers arranged side by side, at least one of which is driven by a motor, gear teeth are provided on the outer peripheral surface of the rollers, and grooves for accommodating plastic powder are arranged between adjacent teeth.

As an improved way, the feed opening of the powder trough deviates from the vertical plane where the rotation axis of the steel pipe is located.

As an improved manner, the turning hopper is located below the corresponding powder chute.

As an improved manner, the powder trough is provided with a vibrator.

As an improved way, the two sides of the steel pipe rotating device are respectively provided with a powder recycling conveyor belt device, and a collecting slide is arranged above the conveyor belt of the powder recycling conveyor belt device.

As an improved manner, the outer peripheral surface of the roller is a conical surface.

As an improved manner, there are two rollers, both of which are driving rollers.

As an improved way, two walking frames are arranged on the same guide rail, the side of the two walking frames close to each other is the inner side, and the side farther away is the outer side, installed on the two The turning drive mechanisms of the inner plastic coating devices of the walking frames are respectively arranged on the outer sides of the corresponding walking frames.

The effect obtained by adopting the above-mentioned technical scheme is:

The inner plastic coating and outer plastic coating of the rotating steel pipe are carried out by using the turning hopper to turn over the powder feeding and the powder trough to sprinkle the powder, which improves the coating speed of the steel pipe and makes the coating of the steel pipe uniform.

Since the discharge opening of the powder trough deviates from the vertical plane where the axis of rotation of the supported steel pipe is located, the steel pipe supports the plastic powder and rotates upwards, which is opposite to the falling direction of the plastic powder, so that the plastic-coated powder and The outer peripheral surface of the steel pipe is in full contact.

Since the turning hopper is located below the corresponding powder trough, plastic-coating powder can be added to the turning hopper by opening the shutter at the bottom of the powder trough.

Due to the installation of the powder recovery conveyor belt device and the collection slide, the plastic coating powder can be recovered and the utilization rate of the plastic coating powder can be improved.

Since the outer peripheral surface of the roller of the steel pipe rotating device is provided with gear teeth, and there is a groove for containing plastic powder between adjacent teeth, when the steel pipe is coated with plastic, the temperature is generally about 280°C to 320°C, and the steel pipe is in contact with the roller. When rolling, the plastic powder on the outer surface of the steel pipe is very sticky and slippery, and the grooves between the teeth of the roller can accommodate these plastic powders, thereby playing an anti-skid role.

Since the outer peripheral surface of the roller of the steel pipe rotating device is set as a conical surface, the steel pipe is placed on the conical surface, the axial force on both ends of the steel pipe can prevent the steel pipe from moving in the axial direction, and at the same time, the contact between the roller and the steel pipe is approximately Line contact, small contact area, little damage to the plastic powder on the steel pipe, easy to repair.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a side structure schematic diagram of the present invention;

Fig. 3 is an enlarged view of part C in Fig. 2;

Fig. 4 is the structural representation of internal coating device;

Figure 5 is a top view of Figure 4;

Fig. 6 is a structural schematic diagram of a steel pipe rotating device;

Fig. 7 is a side view of Fig. 6;

Fig. 8 is the structural representation of embodiment two uncoated state;

Fig. 9 is a schematic structural view of the plastic-coated state of embodiment two;

In the figure, 1-rotary device, 103-roller, 104-motor, 105-support seat, 109-gear, 2-inner plastic coating device, 21-turning shaft, 22-turning hopper, 23-cylinder, 24- Rack, 25-gear, 40-powder trough, 402-deflector, 403-gate, 404-cylinder, 405-vibrator, 501-collecting slide, 502-conveyor belt, 6-ladder, 7 -walking frame, 8-guide rail, 9-steel pipe, 10-underframe.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Embodiment one

As shown in FIG. 1 , FIG. 2 , FIG. 6 and FIG. 7 , a plastic-coating equipment for large-diameter steel pipes includes an underframe 10 , and the underframe 10 is provided with a steel pipe rotating device 1 . The steel pipe rotating device 1 is provided with two groups for supporting the two ends of the steel pipe 9 . Each group of steel pipe rotating device 1 includes a support base 105, which is installed on the chassis 10, and the support base 105 is rotatably equipped with at least two rollers 103 arranged side by side, and at least one roller 103 is a driving roller driven by a motor 104. In this embodiment, there are two rollers 103, both of which are driving rollers. The dual-drive mode can effectively avoid the slipping phenomenon between the steel pipe 9 and the rollers 103 during the plastic coating process.

Gear teeth 109 are arranged on the outer peripheral surface of the roller 103, and grooves for accommodating plastic powder are arranged between adjacent teeth 109. When the steel pipe 9 is coated with plastic, the temperature is generally about 280°C to 320°C. When the steel pipe 9 is in contact with the roller 103, the plastic powder on the outer surface of the steel pipe 9 is very sticky and slippery. The grooves between the teeth 109 of the roller 103 can accommodate these plastics. Powder, so as to play a non-slip effect.

The outer peripheral surface of the roller 103 of the steel pipe rotating device 1 is set as a conical surface, and the steel pipe 9 is placed on the conical surface, and the axial component force on both ends of the steel pipe 9 can prevent the steel pipe 9 from moving in the axial direction. Simultaneously, the contact of roller 103 and steel pipe 9 approximates line contact, and the contact area is small, and damage to the plastic powder on steel pipe 9 is little, and is easy to repair.

Both sides of the steel pipe rotating device 1 are respectively provided with a powder recovery conveyor belt device, and a collection slide 501 is provided above the conveyor belt of the powder recovery conveyor belt device. 501 slides to the powder recovery conveyor belt device, and the recovery conveyor belt device includes a conveyor belt 502 driven by a driving device, which can recycle the plastic-coated powder and improve the utilization rate of the plastic-coated powder.

As shown in Figures 1 to 3, the guide rail 8 is set parallel to the axis of rotation of the steel pipe 9 supported by the steel pipe rotating device 1, the guide rail 8 is provided with a walking frame 7 driven by a power device, and a climbing ladder is installed on one side of the walking frame 7 6. The walking frame 7 is provided with an outer plastic coating device and an inner plastic coating device 2 . Inner plastic coating device 2 is located below the outer plastic coating device. The outer plastic coating device includes a powder material tank 40 , which is fixed on the walking frame 7 , and a shutter 403 driven by an air cylinder 404 is arranged at the discharge port of the powder material tank 40 . A deflector 402 is provided below the feeding port of the powder trough. The feed opening of the powder trough 40 deviates from the vertical plane where the axis of rotation of the supported steel pipe 9 is located, and the side of the steel pipe supporting the plastic powder rotates upwards, opposite to the falling direction of the plastic powder, so that the plastic-coated powder and the steel pipe The peripheral surface of 9 fully contacts. The powder trough 40 is provided with a vibrator 405, and the vibrator 405 vibrates the powder trough 40, so that the plastic-coating powder is evenly poured from the discharge opening at the bottom of the powder trough 40 to the steel pipe 9 to be plastic-coated.

As shown in conjunction with FIG. 4 and FIG. 5 , the inner plastic coating device 2 includes a material turning shaft 21 , and the material turning shaft 21 is rotatably mounted on the walking frame 7 . One end of the turning shaft 21 is connected with a turning drive mechanism, the turning driving mechanism includes a gear 25, the gear 25 is connected to the turning shaft 21, the rack 24 is slidably installed on the walking frame 7 and meshed with the gear 25, and the cylinder 23 is connected to the rack 24 Between the walking frame 7. The other end of the turning shaft 21 is fixedly connected with a turning hopper 22 that can axially extend into the steel pipe 9 . The turning hopper 22 is located below the corresponding powder trough 40 , and plastic-coating powder can be added to the turning hopper 22 by opening the shutter 403 at the bottom of the powder trough 40 . The rotating steel pipe 9 is coated with plastic inside and outside by using the turning hopper 22 to turn over the powder feeding and the powder trough 40 to spread the powder, which improves the coating speed of the steel pipe 9 and makes the coating of the steel pipe 9 uniform.

Plastic coating method of the present invention is:

1) Place the steel pipe 9 preheated to the plastic coating temperature on the roller 103 of the rotating device 1;

2) Drive the steel pipe 9 to rotate through the rotating device 1;

3) Send the powder tank 40 filled with plastic powder to the working position above the outside of the steel pipe 9, and extend the hopper 22 filled with plastic powder into the steel pipe 9 in the axial direction to the working position;

4) Open the shutter 403 of the powder material tank 40, so that the plastic powder is sprinkled onto the outer peripheral surface of the steel pipe 9 from the elongated leakage gap. By controlling the opening time of the shutter 403, the amount of plastic powder sprayed from the powder tank 40 to the steel pipe 9 is controlled. After spraying to the specified amount, close the shutter 403, so that the powder tank 40 is removed from the top of the steel pipe 9;

5) Overturn the turning hopper 22, turn over the plastic powder in the turning hopper 22 to the inner peripheral surface of the steel pipe 9, turn over the turning hopper 22 and return it after the turning is completed;

6) Make the steel pipe 9 continue to rotate until the plastic powder forms a continuous coating on the inner and outer peripheral surfaces of the steel pipe 9;

7) The steel pipe 9 is sent into a curing furnace for curing or cured naturally at room temperature.

Embodiment two

As shown in Figure 8 and Figure 9, two walking frames 7 are arranged on the same guide rail 8, the side of the two walking frames 7 close to each other is the inner side, and the side farther away is the outer side, and they are installed on the two walking frames The overturn drive mechanisms of the inner plastic coating device 2 of 7 are respectively arranged on the outsides of the corresponding walking frames 7 . The two walking frames 7 move towards each other along the track 8, and the powder chute 40 and the turning bucket 22 of the two walking frames 7 move from the two ends of the steel pipe to the middle position of the steel pipe. The combination of the inside and outside plastic coating devices on the two walking frames 7 can complete the inside and outside plastic coating to a longer steel pipe 9 .

The above embodiments are preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention Inside.

Claims (8)

1. A large-diameter steel pipe plastic coating equipment, including: An underframe, the underframe is provided with a steel pipe rotating device; Guide rail, the guide rail is arranged parallel to the rotation axis of the steel pipe supported by the steel pipe rotating device; it is characterized in that, The guide rail is provided with a walking frame driven by a power device, and the walking frame is provided with an outer plastic coating device and an inner plastic coating device, and the inner plastic coating device is located below the outer plastic coating device; The outer plastic coating device includes a powder trough fixed to the walking frame, and a shutter driven by a power device is provided at the discharge port of the powder trough; The inner plastic coating device includes a material turning shaft, which is rotatably mounted on the walking frame, one end of the material turning shaft is connected with a turning drive mechanism, and the other end is fixedly connected with a steel pipe that can axially extend into the steel pipe The turning hopper inside; the turning drive mechanism includes a gear, a rack and a cylinder, the gear is connected to the turning shaft, the rack is slidably installed on the walking frame and meshed with the gear, and the cylinder connected between the rack and the walking frame; The steel pipe rotating device has two groups, which are used to support the two ends of the steel pipe, and each group of the steel pipe rotating device includes a supporting seat, and the supporting seat is installed on the base frame, and the supporting seat is rotatably installed with There are at least two rollers arranged side by side, at least one of which is driven by a motor, gear teeth are provided on the outer peripheral surface of the rollers, and grooves for accommodating plastic powder are arranged between adjacent teeth. 2. The plastic coating equipment for large-diameter steel pipes according to claim 1, characterized in that, the discharge opening of the powder material tank deviates from the vertical plane where the rotation axis of the steel pipe is located. 3. The plastic coating equipment for large-diameter steel pipes according to claim 1, wherein the hopper is located below the corresponding powder tank. 4. The plastic-coating equipment for large-diameter steel pipes according to claim 1, characterized in that the powder tank is provided with a vibrator. 5. The plastic-coating equipment for large-diameter steel pipes as claimed in claim 1, characterized in that powder recovery conveyor belt devices are respectively provided on both sides of the steel pipe rotation device, and a conveyor belt of the powder material recovery conveyor belt device is provided with Aggregating slides. 6. The large-diameter steel pipe plastic coating equipment according to claim 1, characterized in that, the outer peripheral surface of the roller is a conical surface. 7. The plastic-coating equipment for large-diameter steel pipes according to claim 1 or 6, wherein there are two rollers, both of which are driving rollers. 8. The plastic-coating equipment for large-diameter steel pipes as claimed in claim 1, wherein two walking frames are arranged on the same guide rail, and the side where the two walking frames are close to each other is the inner side. The far side is the outer side, and the turning drive mechanisms of the inner plastic coating devices installed on the two walking frames are respectively arranged on the outer sides of the corresponding walking frames.