CN116748105B - Production process of metal pipeline inner lining plastic and outer coating plastic - Google Patents
Production process of metal pipeline inner lining plastic and outer coating plastic Download PDFInfo
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- CN116748105B CN116748105B CN202310759543.0A CN202310759543A CN116748105B CN 116748105 B CN116748105 B CN 116748105B CN 202310759543 A CN202310759543 A CN 202310759543A CN 116748105 B CN116748105 B CN 116748105B
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- metal pipeline
- fixedly connected
- circular ring
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- arc
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- 239000002184 metal Substances 0.000 title claims abstract description 204
- 229920003023 plastic Polymers 0.000 title claims abstract description 64
- 239000004033 plastic Substances 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 42
- 238000000576 coating method Methods 0.000 title claims description 9
- 239000011248 coating agent Substances 0.000 title claims description 8
- 230000007246 mechanism Effects 0.000 claims abstract description 104
- 239000000843 powder Substances 0.000 claims abstract description 66
- 238000007789 sealing Methods 0.000 claims abstract description 53
- 239000004698 Polyethylene Substances 0.000 claims abstract description 52
- -1 polyethylene Polymers 0.000 claims abstract description 52
- 229920000573 polyethylene Polymers 0.000 claims abstract description 52
- 238000000034 method Methods 0.000 claims abstract description 36
- 238000005507 spraying Methods 0.000 claims abstract description 12
- 238000004381 surface treatment Methods 0.000 claims abstract description 6
- 239000006223 plastic coating Substances 0.000 claims description 35
- 238000007790 scraping Methods 0.000 claims description 18
- 239000007921 spray Substances 0.000 claims description 15
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 4
- 230000002146 bilateral effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims 3
- 230000000694 effects Effects 0.000 abstract description 11
- 238000007711 solidification Methods 0.000 abstract description 9
- 230000008023 solidification Effects 0.000 abstract description 9
- 238000007667 floating Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 2
- 229920000297 Rayon Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000001175 rotational moulding Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
- B05D7/146—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies to metallic pipes or tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
- B05B13/0221—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts
- B05B13/0228—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts the movement of the objects being rotative
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
- B05B13/0278—Arrangement or mounting of spray heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B16/00—Spray booths
- B05B16/20—Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
- B05D3/0272—After-treatment with ovens
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Coating Apparatus (AREA)
Abstract
The invention relates to the technical field of plastic-lined and plastic-coated processes of metal pipelines, in particular to a production process of plastic-lined and plastic-coated metal pipelines, which comprises the following steps of firstly, conveying a metal pipeline which is smooth in surface treatment and preheated into a production device through an external conveying mechanism, and sealing and clamping the metal pipeline from the interiors of two ends of the metal pipeline through the production device; when spraying polyethylene powder to the metal pipeline, the sealing clamping mechanism is used for sealing the inner wall of the metal pipeline all the time, so that the powder floating in the air cannot fall on the middle section inside the metal pipeline, and although a small amount of powder falls on the inner wall between the clamping position of the sealing clamping mechanism to the metal pipeline and the two ends of the metal pipeline, the sealing clamping mechanism is taken out after solidification, and meanwhile the powder is scraped off, so that the smoothness of the inner wall of the metal pipeline is effectively guaranteed, and the effect of a subsequent plastic lining process is facilitated.
Description
Technical Field
The invention relates to the technical field of plastic-lined plastic-coated processes of metal pipelines, in particular to a production process of plastic-lined plastic-coated metal pipelines.
Background
The production process of the plastic-coated steel pipe product comprises the steps of pre-treating and heating the steel pipe, then rapidly coating plastic, and curing and forming the steel pipe; the plastic lining process is to spread viscose on the outer wall of the plastic pipe and then to put the plastic pipe inside the heated steel pipe to expand the plastic pipe by heating.
The prior art discloses a part of Chinese patent with the application number of CN201310216870.8 about a metal pipeline plastic lining and coating process, and discloses a method for coating the outside of a steel pipeline plastic lining, which is characterized in that a material conveying device and a lower bracket are arranged on a raw rotomoulding machine, the material conveying device consists of a material conveying pipe and a material spraying pipe arranged on the material conveying pipe, and the material conveying device is used for spraying fusible plastics on a steel substrate to form a plastic coating layer.
In the prior art, when the plastic coating is performed on the outside of a metal pipeline, polyethylene powder which is subjected to electrostatic treatment is directly sprayed on the outer wall of the metal pipeline through a spray gun, in the process, the polyethylene powder floats in the air and finally falls on the inner wall of the metal pipeline, the polyethylene powder of the polyethylene powder is adhered to the inner wall of the metal pipeline after solidification, in the subsequent plastic lining process, the plastic pipeline is required to be sleeved on the inner wall of the metal pipeline, then air between the inner wall of the metal pipeline and the plastic pipeline is discharged in a heating and pressurizing mode, so that the plastic pipeline is adhered on the inner wall of the metal pipeline, but due to the existence of the solidified polyethylene powder, the air is insufficiently discharged, the plastic pipeline cannot be fully adhered on the inner wall of the metal pipeline, and finally slowly falls off, and the protection effect on the metal pipeline is lost.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a production process for inner lining plastic and outer coating plastic of a metal pipeline.
In order to achieve the above purpose, the invention adopts the following technical scheme: a production process of plastic-coated metal pipeline lining plastic comprises the following steps:
Step one, conveying a metal pipeline which is subjected to surface treatment and leveling and preheating to a production device through an external conveying mechanism, and sealing and clamping the metal pipeline from the interiors of two ends of the metal pipeline through the production device;
Step two, after the metal pipeline is clamped by the production device, driving the metal pipeline to synchronously rotate, and spraying polyethylene powder subjected to electrostatic treatment to the outer wall of the metal pipeline through the production device;
Step three, feeding the metal pipeline and part of the structure of the production device into a curing furnace, and preserving heat for minutes at moderate temperature of the curing furnace to realize curing of polyethylene powder;
Taking out the cooled metal pipeline from the curing furnace, restarting the production device, separating the production device from the metal pipeline, and scraping polyethylene powder attached and cured on the inner walls of the two ends of the metal pipeline in the separation process of the production device;
Inserting a plastic pipeline into the metal pipeline with the outer plastic coating, and sending the metal pipeline into a plastic lining machine for plastic lining;
The production device comprises a plastic coating table, wherein a lifting supporting device for supporting a processed metal pipeline is arranged at the top of the plastic coating table, mounting plates are symmetrically and fixedly connected to the left side and the right side of the top of the plastic coating table, two groups of spray guns are symmetrically arranged at the front side and the rear side of the top of the plastic coating table, and the spray nozzles of the two groups of spray guns are opposite to the metal pipeline;
The side walls of the two mounting plates are fixedly provided with sealing clamping mechanisms which are symmetrically arranged, the sealing clamping mechanisms are used for clamping the metal pipeline from the inside, and the sealing clamping mechanisms are used for driving the metal pipeline to rotate;
the back of plastic-coated platform has placed solidification equipment, solidification equipment is used for solidifying the polyethylene powder of metal pipeline surface spraying.
Preferably, the lifting support device comprises a mounting cavity, the mounting cavity is arranged in the middle of the inside of the plastic coating platform, a plurality of first sliding grooves which are linearly distributed are formed between the top surface of the mounting cavity and the top surface of the plastic coating platform in a penetrating mode, a first air cylinder is fixedly connected to the bottom surface of the mounting cavity, a sliding plate is fixedly connected to the top of a telescopic rod of the first air cylinder, the sliding plate is slidably connected to the inner wall of the mounting cavity, a plurality of supporting frames which are linearly distributed are fixedly connected to the top surface of the sliding plate, all the supporting frames are slidably connected to the corresponding first sliding grooves respectively, the tops of the supporting frames penetrate through the first sliding grooves and then extend out, and the top surfaces of the supporting frames are in contact with the outer wall of the metal pipeline.
Preferably, the right side the sealing and clamping mechanism comprises a cylinder, the cylinder is inserted into the right end of the metal pipeline, a first rotating cavity is arranged in the middle of the cylinder, a first rotating shaft is rotatably arranged on the left side surface of the first rotating cavity, the first rotating shaft penetrates through the right end surface of the cylinder and extends outwards, four first fan-shaped grooves distributed in a circumferential array and four second fan-shaped grooves distributed in a circumferential array are arranged on the outer wall of the cylinder, the first fan-shaped grooves and the second fan-shaped grooves are staggered for forty-five degrees, the first fan-shaped grooves and the second fan-shaped grooves are communicated with the first rotating cavity, the four first fan-shaped grooves are connected with a first fan-shaped plate in a sliding manner, the four second fan-shaped plates are connected with the second fan-shaped grooves in a sliding manner, a second sliding manner is arranged on the left side surface of the first fan-shaped grooves, the left side surface of the first sector plate is fixedly connected with a first sliding block, the first sliding block is in sliding connection with the inside of the second sliding groove, a first spring is fixedly connected between the first sliding block and the inner wall, close to the axis of the cylinder, of the second sliding groove, a third sliding groove is formed in the right side surface of the second sector plate, a second sliding block is fixedly connected on the right side surface of the second sector plate, the second sliding block is in sliding connection with the inside of the third sliding groove, a second spring is fixedly connected between the second sliding block and the inner wall, close to the axis of the cylinder, of the third sliding groove, a top moving plate is fixedly connected at the inner cambered surfaces of all the first sector plates and all the second sector plates, two groups of arc-shaped protruding blocks are fixedly connected at the left end of the outer wall of the first rotating shaft, four arc-shaped protruding blocks are distributed in a group and are distributed in a circumferential array, the right side surface of the cylinder is fixedly connected with four first connecting shafts distributed in a circumferential array, the right ends of the four first connecting shafts are fixedly connected with first circular rings together, a first positioning mechanism is connected between the first circular rings and the first rotating shafts, and the first positioning mechanism is used for fixing the relative positions between the first circular rings and the first rotating shafts;
A scraping mechanism is further connected between the first circular ring and the cylinder, and is used for scraping the solidified polyethylene powder attached to the inner wall of the metal pipeline when the cylinder is taken out of the metal pipeline;
the left side sealing and clamping mechanism and the right side sealing and clamping mechanism are symmetrically arranged.
Preferably, the first positioning mechanism comprises a first connecting plate, the first connecting plate is fixedly connected to the right end of the outer wall of the first rotating shaft, one end, away from the axis of the cylinder, of the first connecting plate is fixedly connected with a first positioning plate, a first positioning pin is inserted onto the first positioning plate in a sliding manner, a third spring is fixedly connected between the first positioning pin and the left end face of the first positioning plate, and two first positioning holes are formed in the left end face of the first circular ring.
Preferably, the scraping mechanism comprises a second rotating cavity, a third fan-shaped groove, two groups of first arc-shaped grooves and second arc-shaped grooves, the second rotating cavity is formed in the first rotating shaft, the second rotating cavity is rotationally connected with the second rotating shaft, the two groups of first arc-shaped grooves are formed in the outer wall of the first rotating shaft, the positions of the two groups of first arc-shaped grooves correspond to the positions of the two groups of arc-shaped protruding blocks respectively, through grooves are formed in the middle of all the arc-shaped protruding blocks in a penetrating manner, arc-shaped sliding plates are connected in the through grooves in a sliding manner, connecting blocks are fixedly connected between all the arc-shaped sliding plates and the second rotating shaft, all the connecting blocks are respectively and slidably connected in the inner cavities of the adjacent first arc-shaped grooves, the second arc-shaped grooves are formed in the right side of the outer wall of the first rotating shaft, all the third fan-shaped grooves are respectively formed in the middle of each first rotating shaft in a penetrating manner, all the third fan-shaped grooves are respectively in a sliding manner, through grooves are formed in the inner parts of all the third fan-shaped grooves in a penetrating manner, arc-shaped sliding grooves are respectively, arc-shaped sliding grooves are formed in the right side surfaces of all the third fan-shaped grooves are fixedly connected with a fourth sliding groove, and a fifth sliding groove is fixedly connected between the fourth sliding groove, and a fourth sliding groove is arranged on the side, and a fourth sliding groove is fixedly connected with a fourth sliding groove, and a sliding groove is fixedly connected;
a second positioning mechanism is connected between the second rotating shaft and the first circular ring and used for fixing the relative position between the first circular ring and the second rotating shaft;
and a clamping mechanism is arranged between the first circular ring and the mounting plate, and is used for releasing connection positioning between the first circular ring and the mounting plate when the metal pipeline is required to be sent into the curing device for curing.
Preferably, the second positioning mechanism comprises a second connecting plate, the second connecting plate is fixedly connected to the right end of the outer wall of the second rotating shaft, the second connecting plate is slidably connected to the inside of the second arc-shaped groove, one end, away from the axis of the cylinder, of the second connecting plate is fixedly connected with a second positioning plate, a second positioning pin is slidably inserted on the second positioning plate, a fourth spring is fixedly connected between the left end face of the second positioning pin and the left end face of the second positioning plate, and two second positioning holes are formed in the left end face of the first circular ring.
Preferably, the relative positions between the two first positioning holes and the two second positioning holes are fixed, and the first connecting plate is contacted with the second connecting plate.
Preferably, the clamping mechanism comprises four clamping blocks and a second circular ring, the four clamping blocks are circumferentially arranged and fixed on the right end face of the first circular ring, the clamping blocks are provided with inclined planes and clamping grooves, the second circular ring is positioned on the right side of the first circular ring, the left end face of the second circular ring is provided with four grooves distributed in a circumferential array manner, the four clamping blocks are respectively inserted into the four grooves, the side walls of the four grooves are respectively provided with a third arc-shaped groove, the four third arc-shaped grooves are respectively connected with an arc-shaped plate in a sliding manner, the arc-shaped plates are inserted into the adjacent clamping grooves, a sixth spring is fixedly connected between the arc-shaped plates and the side wall of the third arc-shaped groove, which is far away from one end of the groove, the right side wall of the second circular ring is provided with four arc-shaped sliding grooves distributed in a circumferential array manner, the right side faces of the four arc plates are fixedly connected with connecting rods, the connecting rods are slidably connected in the adjacent arc-shaped sliding grooves, the right ends of the four connecting rods penetrate through the adjacent arc-shaped sliding grooves and then are fixedly connected with a third circular ring, the front side of the left side face of the third circular ring is fixedly connected with a rack, the front side of the right side face of the second circular ring is fixedly connected with a micro motor, the output shaft of the micro motor is fixedly connected with a gear, the gear is meshed with the rack, the circumferential array on the right side of the second circular ring is fixedly connected with two second connecting shafts, the right ends of the two second connecting shafts are fixedly connected with discs together, the circumferential array on the side wall of the first circular ring is penetrated and provided with four jacks, the left ends of the jacks penetrate through the adjacent first connecting shafts, the left end face of the second circular ring is fixedly connected with four inserting rods, the four inserting rods are respectively inserted into the four inserting holes;
And a rotary driving mechanism is arranged between the disc and the mounting plate and used for driving the disc to rotate.
Preferably, the rotary driving mechanism comprises a motor, the motor is fixedly installed on the side wall of the mounting plate, which is opposite to the metal pipeline, the end part of the motor output shaft penetrates through the mounting plate and then is fixedly connected with a mounting frame, the mounting frame is rotationally connected to the side wall of the mounting plate, a second cylinder is fixedly connected to the side wall of the mounting frame, and the end part of the second cylinder telescopic rod is fixedly connected with the disc.
Preferably, the curing device comprises a curing furnace, wherein two rectangular supporting tables are fixedly connected on the bottom surface of the inside of the curing furnace in a bilateral symmetry mode, and rectangular grooves are formed in the top surface of each rectangular supporting table.
Compared with the prior art, the invention has the following beneficial effects:
1. When spraying polyethylene powder to the metal pipeline, the sealing clamping mechanism is used for sealing the inner wall of the metal pipeline all the time, so that the powder floating in the air cannot fall on the middle section inside the metal pipeline, and although a small amount of powder falls on the inner wall between the clamping position of the sealing clamping mechanism to the metal pipeline and the two ends of the metal pipeline, the sealing clamping mechanism is taken out after solidification, and meanwhile the powder is scraped off, so that the smoothness of the inner wall of the metal pipeline is effectively guaranteed, and the effect of a subsequent plastic lining process is facilitated.
2. The first cylinder drives the sliding plate to slide downwards through the telescopic rod so as to drive the supporting frame to slide downwards, so that the supporting frame is separated from the outer wall of the metal pipeline, and at the moment, the effect of spraying polyethylene powder is relatively uniform because the outer wall of the metal pipeline is not contacted with other structures.
3. In the resetting process of the first sector plate and the second sector plate, the scraping mechanism always keeps fit with the inner wall of the metal pipeline, so that the cylinder can be taken out, and polyethylene powder which is adhered to the inner wall of the metal pipeline and is solidified is scraped by the scraping mechanism in the taking out process, so that the cleaning of the inner wall of the metal pipeline is favorably realized in the process of taking out the cylinder, and the influence on the subsequent lining molding process caused by residual solidified polyethylene powder on the inner wall of the metal pipeline is favorably avoided.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a cross-sectional view of the plastic coated table structure of the present invention;
FIG. 3 is an enlarged view of the structure of FIG. 2B in accordance with the present invention;
FIG. 4 is a schematic view of the right side sealing and clamping mechanism of the present invention;
FIG. 5 is a schematic view of the connection between the first slider and the second chute according to the present invention;
FIG. 6 is a schematic view of a connection between a second slide block and a third slide slot according to the present invention;
FIG. 7 is a top view of the structure at the first sector plate and the second sector plate of the present invention;
FIG. 8 is a schematic cross-sectional view taken along line A-A of FIG. 7 in accordance with the present invention;
FIG. 9 is a schematic view of a seal clamping mechanism (cylinder removed) according to the present invention;
FIG. 10 is an enlarged view of the structure of FIG. 9C in accordance with the present invention;
FIG. 11 is a top view of the seal clamping mechanism of the present invention (with the cylinder removed);
FIG. 12 is a schematic cross-sectional view taken along line B-B of FIG. 11 in accordance with the present invention;
FIG. 13 is a schematic view of a clamping mechanism (partially cut away) according to the present invention;
FIG. 14 is an enlarged view of the structure of FIG. 13A in accordance with the present invention;
FIG. 15 is a schematic view of the fan blade of the present invention after being exploded from the connection with the first fan plate;
fig. 16 is a schematic view of a cross-sectional structure of a cylinder according to the present invention.
In the figure: 2. A mounting plate; 3. a spray gun; 5. A mounting cavity; 6. a first chute; 7. a first cylinder; 8. a slide plate; 9. a support frame; 10. a cylinder; 11. a first rotation chamber; 12. a first rotating shaft; 13. a first fan-shaped groove; 14. a second fan-shaped groove; 15. a first sector plate; 16. a second sector plate; 17. a second chute; 18. a first slider; 19. a first spring; 20. a third chute; 21. a second slider; 22. a second spring; 23. a top movable plate; 24. arc-shaped protruding blocks; 25. a first connecting shaft; 26. a first ring; 27. a first connection plate; 28. a first positioning plate; 29. a first positioning pin; 30. a third spring; 31. a first positioning hole; 32. a second rotation chamber; 33. a third fan-shaped groove; 34. a first arc-shaped groove; 35. a second arc-shaped groove; 36. a second rotating shaft; 37. an arc-shaped sliding plate; 38. a connecting block; 39. a second connecting plate; 40. a second positioning plate; 41. a second positioning pin; 42. a fourth spring; 43. a second positioning hole; 44. a fourth chute; 45. a fan-shaped scraper; 46. a third slider; 47. a fifth spring; 48. a motor; 49. a second cylinder; 50. a disc; 51. a second connecting shaft; 52. a second ring; 53. a rod; 54. a socket; 55. a clamping block; 5501. an inclined plane; 5502. a clamping groove; 56. a groove; 57. a third arc-shaped groove; 58. an arc-shaped plate; 59. a sixth spring; 60. an arc chute; 61. a connecting rod; 62. a third ring; 63. a rack; 64. a micro motor; 65. a gear.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art.
A process for producing a metal pipe lining plastic-coated outer plastic as shown in fig. 1 to 16, comprising the steps of:
Step one, conveying a metal pipeline which is subjected to surface treatment and leveling and preheating to a production device through an external conveying mechanism, and sealing and clamping the metal pipeline from the interiors of two ends of the metal pipeline through the production device;
Step two, after the metal pipeline is clamped by the production device, driving the metal pipeline to synchronously rotate, and spraying polyethylene powder subjected to electrostatic treatment to the outer wall of the metal pipeline through the production device;
Step three, feeding the metal pipeline and part of the structure of the production device into a curing furnace, and preserving heat for 20 minutes at the temperature of 200 ℃ in the curing furnace to realize the curing of polyethylene powder;
Taking out the cooled metal pipeline from the curing furnace, restarting the production device, separating the production device from the metal pipeline, and scraping polyethylene powder attached and cured on the inner walls of the two ends of the metal pipeline in the separation process of the production device;
Inserting a plastic pipeline into the metal pipeline with the outer plastic coating, and sending the metal pipeline into a plastic lining machine for plastic lining;
The production device in the first to fifth steps comprises a plastic coating table, wherein a lifting supporting device for supporting a processed metal pipeline is arranged at the top of the plastic coating table, mounting plates 2 are symmetrically and fixedly connected to the left side and the right side of the top of the plastic coating table, two groups of spray guns 3 are symmetrically arranged at the front side and the rear side of the top of the plastic coating table, and the spray nozzles of the two groups of spray guns 3 are opposite to the metal pipeline;
the side walls of the two mounting plates 2 are fixedly provided with sealing clamping mechanisms which are symmetrically arranged, the sealing clamping mechanisms are used for clamping the metal pipeline from the inside, and the sealing clamping mechanisms are used for driving the metal pipeline to rotate;
the back of the plastic-coated table is provided with a curing device which is used for curing polyethylene powder sprayed on the surface of the metal pipeline.
When the plastic coating device is used for coating plastic on the outside of a metal pipeline in the prior art, polyethylene powder which is subjected to electrostatic treatment is directly sprayed on the outer wall of the metal pipeline through a spray gun, a part of the polyethylene powder finally falls on the inner wall of the metal pipeline in the process of floating in the air, the part of the polyethylene powder is adhered to the inner wall of the metal pipeline after solidification, in the subsequent plastic lining process, the plastic pipeline is required to be sleeved on the inner wall of the metal pipeline, then air between the inner wall of the metal pipeline and the plastic pipeline is discharged in a heating and pressurizing mode, so that the plastic pipeline is adhered on the inner wall of the metal pipeline, but the air is insufficiently discharged due to the existence of the solidified polyethylene powder, and finally the plastic pipeline slowly falls off, so that the protection effect on the metal pipeline is lost. Firstly, conveying a metal pipeline which is smooth in surface treatment and preheated to a plastic coating table through an external conveying mechanism, sealing and clamping the metal pipeline from the inside of the metal pipeline through a sealing and clamping mechanism, then driving the metal pipeline to synchronously rotate through the rotation of the sealing and clamping mechanism, spraying polyethylene powder which is subjected to electrostatic treatment to the outer wall of the metal pipeline through a spray gun 3, wherein a small amount of polyethylene powder still falls on the clamping position of the sealing and clamping mechanism on the metal pipeline and the inner wall between two ends of the metal pipeline in the process, conveying the metal pipeline with the polyethylene powder attached to the surface together with the sealing and clamping mechanism to a curing device, conveying the metal pipeline back to the plastic coating table after the polyethylene powder on the surface of the metal pipeline is cured, extracting the sealing and clamping mechanism from the metal pipeline, scraping the polyethylene powder attached to and cured on the inner wall between two ends of the metal pipeline in the extracting process, so that the inner wall of the metal pipeline is in a smooth and flat state, and convenient for subsequent lining plastic work; in the process, when polyethylene powder is sprayed on the metal pipeline, the sealing clamping mechanism is used for always sealing the inner wall of the metal pipeline, so that the powder floating in the air cannot fall on the middle section inside the metal pipeline, and even though a small amount of powder falls on the inner wall between the clamping position of the sealing clamping mechanism on the metal pipeline and the two ends of the metal pipeline, the sealing clamping mechanism is taken out after solidification, and meanwhile the powder is scraped off, so that the smoothness of the inner wall of the metal pipeline is effectively guaranteed, and the effect of a subsequent plastic lining process is facilitated.
As one implementation mode of the invention, the lifting supporting device comprises a mounting cavity 5, wherein the mounting cavity 5 is arranged in the middle of the inside of the plastic coating platform, a plurality of first sliding grooves 6 which are linearly distributed are formed between the top surface of the mounting cavity 5 and the top surface of the plastic coating platform in a penetrating way, a first air cylinder 7 is fixedly connected to the bottom surface of the mounting cavity 5, a sliding plate 8 is fixedly connected to the top of a telescopic rod of the first air cylinder 7, the sliding plate 8 is slidingly connected to the inner wall of the mounting cavity 5, a plurality of supporting frames 9 which are linearly distributed are fixedly connected to the top surface of the sliding plate 8, all the supporting frames 9 are respectively slidingly connected to the corresponding first sliding grooves 6, the tops of all the supporting frames 9 extend out after penetrating through the first sliding grooves 6, and the top surfaces of the supporting frames 9 are contacted with the outer wall of a metal pipeline; during operation, in the prior art, when polyethylene powder is sprayed on the outer wall of the metal pipeline, the metal pipeline is mostly rotated on the support, and in the process, the contacted part is continuously rubbed due to the contact of the metal pipeline and the support, so that the attached powder of the part is not uniform enough, the plastic coating effect is affected, and the embodiment of the invention can solve the problems as follows: after the metal pipeline is conveyed to the supporting frame 9, the inside at two ends of the metal pipeline is clamped through the sealing and clamping mechanism, then the telescopic rod of the first air cylinder 7 is started to shrink, the first air cylinder 7 drives the sliding plate 8 to slide downwards through the telescopic rod, so that the supporting frame 9 is driven to slide downwards, the supporting frame 9 is separated from the outer wall of the metal pipeline, and at the moment, the effect of spraying polyethylene powder is relatively uniform because the outer wall of the metal pipeline is not in contact with other structures.
As one implementation mode of the invention, the right sealing and clamping mechanism comprises a cylinder 10, the cylinder 10 is inserted into the right end of the inside of a metal pipeline, a first rotating cavity 11 is arranged in the middle of the inside of the cylinder 10, a first rotating shaft 12 is rotatably arranged on the left side surface of the first rotating cavity 11, the first rotating shaft 12 penetrates through the right end surface of the cylinder 10 and extends outwards, four first fan-shaped grooves 13 distributed in a circumferential array and four second fan-shaped grooves 14 distributed in a circumferential array are arranged on the outer wall of the cylinder 10, the first fan-shaped grooves 13 and the second fan-shaped grooves 14 are staggered for forty-five degrees, the first fan-shaped grooves 13 and the second fan-shaped grooves 14 are communicated with the first rotating cavity 11, a first fan-shaped plate 15 is slidably connected in the inside of the four first fan-shaped grooves 13, a second fan-shaped plate 16 is slidably connected in the inside of the four second fan-shaped grooves 14, a second chute 17 is arranged on the left side surface of the first fan-shaped grooves 13, the left side surface of the first sector plate 15 is fixedly connected with a first sliding block 18, the first sliding block 18 is in sliding connection with the inside of a second sliding groove 17, a first spring 19 is fixedly connected between the first sliding block 18 and the inner wall of the second sliding groove 17, which is close to the axis of the cylinder 10, a third sliding groove 20 is arranged on the right side surface of the second sector plate 14, a second sliding block 21 is fixedly connected on the right side surface of the second sector plate 16, the second sliding block 21 is in sliding connection with the inside of the third sliding groove 20, a second spring 22 is fixedly connected between the second sliding block 21 and the inner wall of the third sliding groove 20, which is close to the axis of the cylinder 10, the inner cambered surfaces of all the first sector plates 15 and all the second sector plates 16 are fixedly connected with a top moving plate 23, the left end of the outer wall of the first rotating shaft 12 is fixedly connected with two groups of arc-shaped protruding blocks 24, the arc-shaped protruding blocks 24 are distributed in a group and are in a circumferential array, the two groups of arc-shaped protruding blocks 24 are staggered by forty-five degrees, the right side surface of the cylinder 10 is fixedly connected with four first connecting shafts 25 distributed in a circumferential array, the right ends of the four first connecting shafts 25 are fixedly connected with first circular rings 26 together, a first positioning mechanism is connected between the first circular rings 26 and the first rotating shaft 12, and the first positioning mechanism is used for fixing the relative position between the first circular rings 26 and the first rotating shaft 12;
A scraping mechanism is also connected between the first circular ring 26 and the cylinder 10, and is used for scraping the solidified polyethylene powder attached to the inner wall of the metal pipeline when the cylinder 10 is taken out of the metal pipeline;
The left side sealing clamping mechanism and the right side sealing clamping mechanism are symmetrically arranged.
When the metal pipeline is required to be clamped, an operator starts the first positioning mechanism, the first positioning mechanism drives the arc-shaped protruding block 24 to rotate by driving the first rotating shaft 12 to rotate, the arc-shaped protruding block 24 extrudes the top moving plate 23 through an arc surface after rotating, the top moving plate 23 is pushed to move towards the outer wall of the cylinder 10, the top moving plate 23 drives the first sector plate 15 and the second sector plate 16 to slide in the first sector groove 13 and the second sector groove 14 respectively, meanwhile, the first sliding block 18 and the second sliding block 21 slide in the second sliding groove 17 and the third sliding groove 20 respectively, the first spring 19 and the second spring 22 are stretched in the process, and after the first sector plate 15 and the second sector plate 16 are driven to extend completely along the first sector groove 13 and the second sector groove 14, the top moving distance of the arc-shaped protruding block 24 to the top moving plate 23 is maximum, and the first sector plate 15 and the second sector plate 16 are tightly attached to the inside the metal pipeline, so that the metal pipeline is clamped; when the cylinder 10 needs to be taken out, the first positioning mechanism is started to reset, so that the arc-shaped protruding block 24 is driven to rotate and reset, at the moment, the first sliding block 18 and the second sliding block 21 reset under the elastic reset force of the first spring 19 and the second spring 22 respectively, and simultaneously drive the first sector plate 15 and the second sector plate 16 to reset, at the moment, the first sector plate 15 and the second sector plate 16 are separated from the inner wall of the metal pipeline, the scraping mechanism always keeps the fit with the inner wall of the metal pipeline in the resetting process of the first sector plate 15 and the second sector plate 16, the cylinder 10 can be taken out, and the scraping mechanism scrapes the solidified polyethylene powder attached to the inner wall of the metal pipeline in the taking out process, so that the cleaning of the inner wall of the metal pipeline is facilitated, and the influence on the subsequent lining plastic process caused by the residual solidified polyethylene powder on the inner wall of the metal pipeline is avoided.
As an embodiment of the invention, the first positioning mechanism comprises a first connecting plate 27, the first connecting plate 27 is fixedly connected to the right end of the outer wall of the first rotating shaft 12, one end of the first connecting plate 27, which is far away from the axis of the cylinder 10, is fixedly connected with a first positioning plate 28, a first positioning pin 29 is slidably inserted on the first positioning plate 28, a third spring 30 is fixedly connected between the first positioning pin 29 and the left end surface of the first positioning plate 28, and two first positioning holes 31 are formed in the left end surface of the first circular ring 26; during operation, a worker pulls the first positioning pin 29 out of the first positioning hole 31, stretches the third spring 30, rotates the first connecting plate 27, drives the first positioning pin 29 to synchronously move by the first connecting plate 27, enables the first positioning pin 29 to reach the position of the other first positioning hole 31, and the first positioning pin 29 is inserted into the other first positioning hole 31 under the elastic force of the third spring 30, so that the first positioning plate 28 and the first circular ring 26 are positioned through the first positioning pin 29, and the first circular ring 26 and the cylinder 10 are fixedly connected through the first connecting shaft 25, so that the position of the first rotating shaft 12 relative to the cylinder 10 is fixed.
As an embodiment of the present invention, the scraping mechanism includes a second rotating cavity 32, a third fan-shaped slot 33, two sets of first arc-shaped slots 34 and a second arc-shaped slot 35, the second rotating cavity 32 is opened inside the first rotating shaft 12, the second rotating shaft 36 is rotatably connected inside the second rotating cavity 32, the two sets of first arc-shaped slots 34 are opened on the outer wall of the first rotating shaft 12, the positions of the two sets of first arc-shaped slots 34 respectively correspond to the positions of the two sets of arc-shaped protruding blocks 24, through slots are opened in the middle of all the arc-shaped protruding blocks 24, arc-shaped sliding plates 37 are slidingly connected inside all the through slots, a connecting block 38 is fixedly connected between all the arc-shaped sliding plates 37 and the second rotating shaft 36, all the connecting blocks 38 are slidingly connected inside the inner cavities of the adjacent first arc-shaped slots 34, the second arc-shaped slot 35 is opened on the right side of the outer wall of the first rotating shaft 12, all the third fan-shaped slots 33 are respectively opened in the middle of each first fan-shaped plate 15 and the second fan-shaped plate 16, a fan-shaped scraper 45 is slidingly inserted inside all the third fan-shaped slots 33, a fourth fan-shaped sliding slot 44 is arranged on the right side surface of the third fan-shaped slot 33, a fourth sliding slot 44 is fixedly connected with a fourth sliding slot 46, and a fifth sliding slot 46 is fixedly connected with a fourth sliding slot 46, and a fourth sliding slot 46 is fixedly arranged on the fourth sliding slot 46, and is fixedly connected with a fourth sliding slot 46, and a fourth sliding slot 46;
A second positioning mechanism is connected between the second rotating shaft 36 and the first circular ring 26, and the second positioning mechanism is used for fixing the relative position between the first circular ring 26 and the second rotating shaft 36;
A clamping mechanism is arranged between the first circular ring 26 and the mounting plate 2, and is used for releasing the connection positioning between the first circular ring 26 and the mounting plate 2 when the metal pipeline is required to be sent into the curing device for curing.
When the metal pipeline needs to be clamped, an operator synchronously starts a second positioning mechanism and a first positioning mechanism, the second positioning mechanism drives a second rotating shaft 36 to synchronously rotate with a first rotating shaft 12, a connecting block 38 is linked to drive an arc sliding plate 37 to rotate, the cambered surface of the arc sliding plate 37 extrudes one side of a fan-shaped scraper 45 close to the axis of a cylinder 10, so that the fan-shaped scraper 45 and a first fan-shaped plate 15 and a second fan-shaped plate 16 synchronously extend out, when the metal pipeline needs to be sent into a curing device for curing, the operator starts a clamping mechanism, the clamping mechanism is used for releasing the connection positioning between the first circular ring 26 and a mounting plate 2, so that the first circular ring 26 can be separated from the mounting plate 2, and the first circular ring 26 can synchronously process the inside of the curing device along with the metal pipeline, and therefore sealing of two ends of the metal pipeline is kept, when the cylinder 10 needs to be taken out, the operator starts the first positioning mechanism to reset, at the moment, the first fan-shaped plate 15 and the second fan-shaped plate 16 synchronously retract to the first fan-shaped plate 13 and the inner wall 45 of the second fan-shaped plate 14 are synchronously retracted to the first fan-shaped plate 13, and the inner wall 45 of the first fan-shaped plate 45 can be simultaneously pulled out of the first fan-shaped plate 16, and the inner wall 45 of the first fan-shaped plate 45 can be correspondingly stretched with the fan-shaped plate 45, and the inner wall 45 of the first fan-shaped plate is correspondingly stretched, and the first fan-shaped plate 45 can be pulled, and the inner wall 45 of the first fan-shaped plate 45 can be simultaneously, and the inner wall 45 of the first fan-shaped plate is correspondingly pulled, and the inner wall 45 can be pulled, and the inner wall of the metal plate 45 can be correspondingly, and the inner wall of the metal plate is correspondingly, and the first circular plate is correspondingly, and the inner wall is stretched, and the inner wall 45, and the fourth plate, can be is correspondingly; when the cylinder 10 is completely taken out, the fan-shaped scraper 45 needs to be reset, at the moment, the second positioning mechanism is started to rotate and reset, the arc-shaped sliding plate 37 also rotates and resets in the process, the third sliding block 46 slides and resets under the elastic reset force of the fifth spring 47, and meanwhile, the fan-shaped scraper 45 is driven to slide and reset.
As an implementation mode of the invention, the second positioning mechanism comprises a second connecting plate 39, the second connecting plate 39 is fixedly connected to the right end of the outer wall of the second rotating shaft 36, the second connecting plate 39 is slidably connected to the inside of the second arc-shaped groove 35, one end of the second connecting plate 39 far away from the axis of the cylinder 10 is fixedly connected with a second positioning plate 40, a second positioning pin 41 is slidably inserted on the second positioning plate 40, a fourth spring 42 is fixedly connected between the second positioning pin 41 and the left end surface of the second positioning plate 40, and two second positioning holes 43 are formed on the left end surface of the first circular ring 26; when the rotary positioning device works, a worker pulls the second positioning pin 41 out of the second positioning hole 43, stretches the fourth spring 42, rotates the second connecting plate 39, and drives the second positioning plate 40 to rotate, so that the second positioning plate 40 drives the second positioning pin 41 to reach the position of the other second positioning hole 43, and the second positioning pin 41 is inserted into the other second positioning hole 43 under the elastic force of the fourth spring 42, so that the position of the second rotary shaft 36 relative to the cylinder 10 is fixed.
As one embodiment of the present invention, the relative positions between the two first positioning holes 31 and the two second positioning holes 43 are fixed, and the first connection plate 27 is in contact with the second connection plate 39; when the first connecting plate 27 is rotated, the first connecting plate 27 contacts with the second connecting plate 39, so that the first connecting plate 27 simultaneously drives the second connecting plate 39 to rotate together, and meanwhile, the second positioning pin 41 correspondingly reaches the position of the other second positioning hole 43 when the first positioning pin 29 reaches the position of the other first positioning hole 31 due to the fixed relative positions of the first positioning hole 31 and the two second positioning holes 43; when the first connecting plate 27 and the second connecting plate 39 are reset, the reset of the first connecting plate 27 is rotated, so that the second connecting plate 39 is not affected, and the fan-shaped scraper 45 is still attached to the inner wall of the metal pipeline.
As one embodiment of the invention, the clamping mechanism comprises four clamping blocks 55 and a second circular ring 52, the four clamping blocks 55 are circumferentially arrayed and fixed on the right end face of the first circular ring 26, the clamping blocks 55 are provided with inclined faces 5501 and clamping grooves 5502, the second circular ring 52 is positioned on the right side of the first circular ring 26, the left end face of the second circular ring 52 is provided with four grooves 56 distributed in a circumferential array manner, the four clamping blocks 55 are respectively inserted into the four grooves 56, the side walls of the four grooves 56 are respectively provided with a third arc-shaped groove 57, arc-shaped plates 58 are slidably connected in the four third arc-shaped grooves 57, the arc-shaped plates 58 are inserted into the adjacent clamping grooves 5502, a sixth spring 59 is fixedly connected between the arc-shaped plates 58 and the side wall of the third arc-shaped grooves 57, which is far away from one end of the grooves 56, the right side wall of the second circular ring 52 is provided with four arc-shaped sliding grooves 60 distributed in a circumferential array manner, the right sides of the four arc plates 58 are fixedly connected with connecting rods 61, the connecting rods 61 are slidably connected in the adjacent arc sliding grooves 60, the right ends of the four connecting rods 61 are fixedly connected with a third circular ring 62 after penetrating through the adjacent arc sliding grooves 60, the front side of the left side surface of the third circular ring 62 is fixedly connected with a rack 63, the front side of the right side surface of the second circular ring 52 is fixedly connected with a micro motor 64, the output shaft of the micro motor 64 is fixedly connected with a gear 65, the gear 65 is meshed with the rack 63, the circumferential array on the right side of the second circular ring 52 is fixedly connected with two second connecting shafts 51, the right ends of the two second connecting shafts 51 are fixedly connected with discs 50 together, the circumferential array on the side wall of the first circular ring 26 is penetrated and provided with four jacks 54, the left ends of the jacks 54 penetrate through the adjacent first connecting shafts 25, the left end surface of the second circular ring 52 is fixedly connected with four inserting rods 53, the four inserting rods 53 are respectively inserted into the four inserting holes 54;
A rotary driving mechanism is arranged between the disc 50 and the mounting plate 2 and is used for driving the disc 50 to rotate; when the metal pipe surface is sprayed with polyethylene powder, the powder still floats in the air, so that the first sector plate 15 and the second sector plate 16 are required to be sent into the curing device together with the metal pipe, at the moment, the micro motor 64 is started to drive the gear 65 to rotate, the gear 65 rotates to drive the rack 63 meshed with the gear 65 to rotate, the rack 63 is linked with the third circular ring 62 to rotate, the arc plate 58 is pulled out of the clamping groove 5502, at the moment, the rotary driving mechanism is started to pull the disc 50 to move towards the mounting plate 2, the second circular ring 52 is driven to move rightwards, the clamping block 55 is pulled out of the groove 56, the inserting rod 53 is driven to be pulled out of the inserting hole 54, the separation of the first circular ring 26 and the second circular ring 52 is realized, the first sector plate 15 and the second sector plate 16 can be positioned in the metal pipe together with the first circular ring 26, along with the synchronous entering of the metal pipeline into the curing device for curing processing, after the curing is finished, the first sector plate 15 and the second sector plate 16 need to be taken out, at this time, the rotary driving mechanism is started again to drive the second circular ring 52 to approach the first circular ring 26, in the process, the clamping block 55 is inserted into the groove 56, the inclined plane 5501 of the clamping block 55 extrudes the arc plate 58 to slide in the third arc groove 57, meanwhile, the sixth spring 59 is compressed, when the second circular ring 52 is attached to the first circular ring 26, the arc plate 58 is aligned with the clamping groove 5502, the arc plate 58 is keyed into the clamping groove 5502 under the elastic force of the sixth spring 59 to realize the transverse fixation of the first circular ring 26 and the second circular ring 52, at this time after the clamping of the first sector plate 15, the second sector plate 16 and the metal pipeline is released, the rotary driving mechanism can be started to pull the first circular ring 26 rightward to drive the first sector plate 15 and the second sector plate 16 to be pulled out.
As one implementation mode of the invention, the rotary driving mechanism comprises a motor 48, the motor 48 is fixedly arranged on the side wall of the mounting plate 2, which is opposite to the metal pipeline, the end part of the output shaft of the motor 48 penetrates through the mounting plate 2 and is fixedly connected with a mounting frame, the mounting frame is rotatably connected to the side wall of the mounting plate 2, the side wall of the mounting frame is fixedly connected with a second air cylinder 49, and the end part of a telescopic rod of the second air cylinder 49 is fixedly connected with a disc 50; when the metal pipeline clamping device works, after the first sector plate 15 and the second sector plate 16 clamp a metal pipeline, the motor 48 is started, the output shaft of the motor 48 drives the second air cylinder 49 to rotate and then drives the disc 50 to rotate, so that the first circular ring 26 and the cylinder 10 fixedly connected with the first circular ring 26 are driven to rotate through the disc 50, then the metal pipeline is driven to rotate through the first sector plate 15 and the second sector plate 16, and the disc 50 can be driven to transversely move through the telescopic rod after the second air cylinder 49 is started.
As one implementation mode of the invention, the curing device comprises a curing furnace, wherein two rectangular supporting tables are fixedly connected on the bottom surface of the inside of the curing furnace in a bilateral symmetry manner, and rectangular grooves are formed in the top surface of each rectangular supporting table; in most curing ovens during operation, the metal pipe is still directly placed on the bracket for curing, and the contact between the metal pipe and the bracket still causes non-uniform curing of the polyethylene powder during curing, and the embodiment of the invention can solve the problems as follows: the first circular ring 26 is clamped through the external conveying mechanism and conveyed into the curing oven, and the first circular ring 26 is correspondingly placed in the rectangular groove, so that the outer wall of the metal pipeline is not contacted with any structure, and the curing effect of polyethylene powder is guaranteed.
The working principle of the invention is as follows:
When the plastic coating device is used for coating plastic on the outside of a metal pipeline in the prior art, polyethylene powder which is subjected to electrostatic treatment is directly sprayed on the outer wall of the metal pipeline through a spray gun, a part of the polyethylene powder finally falls on the inner wall of the metal pipeline in the process of floating in the air, the part of the polyethylene powder is adhered to the inner wall of the metal pipeline after solidification, in the subsequent plastic lining process, the plastic pipeline is required to be sleeved on the inner wall of the metal pipeline, then air between the inner wall of the metal pipeline and the plastic pipeline is discharged in a heating and pressurizing mode, so that the plastic pipeline is adhered on the inner wall of the metal pipeline, but the air is insufficiently discharged due to the existence of the solidified polyethylene powder, and finally the plastic pipeline slowly falls off, so that the protection effect on the metal pipeline is lost. Firstly, conveying a metal pipeline which is smooth in surface treatment and preheated to a plastic coating table through an external conveying mechanism, sealing and clamping the metal pipeline from the inside of the metal pipeline through a sealing and clamping mechanism, then driving the metal pipeline to synchronously rotate through the rotation of the sealing and clamping mechanism, spraying polyethylene powder which is subjected to electrostatic treatment to the outer wall of the metal pipeline through a spray gun 3, wherein a small amount of polyethylene powder still falls on the clamping position of the sealing and clamping mechanism on the metal pipeline and the inner wall between two ends of the metal pipeline in the process, conveying the metal pipeline with the polyethylene powder attached to the surface together with the sealing and clamping mechanism to a curing device, conveying the metal pipeline back to the plastic coating table after the polyethylene powder on the surface of the metal pipeline is cured, extracting the sealing and clamping mechanism from the metal pipeline, scraping the polyethylene powder attached to and cured on the inner wall between two ends of the metal pipeline in the extracting process, so that the inner wall of the metal pipeline is in a smooth and flat state, and convenient for subsequent lining plastic work; in the process, when polyethylene powder is sprayed on the metal pipeline, the sealing clamping mechanism is used for always sealing the inner wall of the metal pipeline, so that the powder floating in the air cannot fall on the middle section inside the metal pipeline, and even though a small amount of powder falls on the inner wall between the clamping position of the sealing clamping mechanism on the metal pipeline and the two ends of the metal pipeline, the sealing clamping mechanism is taken out after solidification, and meanwhile the powder is scraped off, so that the smoothness of the inner wall of the metal pipeline is effectively guaranteed, and the effect of a subsequent plastic lining process is facilitated.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the foregoing embodiments, but rather, the foregoing embodiments and description illustrate the principles of the invention, and that various changes and modifications may be effected therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (8)
1. The production process of the metal pipeline inner lining plastic and outer coating plastic is characterized by comprising the following steps of:
Step one, conveying a metal pipeline which is subjected to surface treatment and leveling and preheating to a production device through an external conveying mechanism, and sealing and clamping the metal pipeline from the interiors of two ends of the metal pipeline through the production device;
Step two, after the metal pipeline is clamped by the production device, driving the metal pipeline to synchronously rotate, and spraying polyethylene powder subjected to electrostatic treatment to the outer wall of the metal pipeline through the production device;
Step three, feeding the metal pipeline and part of the structure of the production device into a curing furnace, and preserving heat for 20 minutes at the temperature of 200 ℃ in the curing furnace to realize the curing of polyethylene powder;
Taking out the cooled metal pipeline from the curing furnace, restarting the production device, separating the production device from the metal pipeline, and scraping polyethylene powder attached and cured on the inner walls of the two ends of the metal pipeline in the separation process of the production device;
Inserting a plastic pipeline into the metal pipeline with the outer plastic coating, and sending the metal pipeline into a plastic lining machine for plastic lining;
The production device comprises a plastic coating table, wherein a lifting supporting device for supporting a processed metal pipeline is arranged at the top of the plastic coating table, mounting plates (2) are symmetrically and fixedly connected to the left side and the right side of the top of the plastic coating table, two groups of spray guns (3) are symmetrically arranged at the front side and the rear side of the top of the plastic coating table, and the spray nozzles of the two groups of spray guns (3) are opposite to the metal pipeline;
The side walls of the two mounting plates (2) are fixedly provided with sealing clamping mechanisms which are symmetrically arranged, the sealing clamping mechanisms are used for clamping the metal pipeline from the inside, and the sealing clamping mechanisms are used for driving the metal pipeline to rotate;
the back of the plastic-coated table is provided with a curing device which is used for curing polyethylene powder sprayed on the surface of the metal pipeline;
The right side sealing and clamping mechanism comprises a cylinder (10), the right end inside a metal pipeline is spliced by the cylinder (10), a first rotating cavity (11) is formed in the middle inside the cylinder (10), a first rotating shaft (12) is rotatably arranged on the left side surface of the first rotating cavity (11), the first rotating shaft (12) penetrates through the right end surface of the cylinder (10) and extends outwards, four first fan-shaped grooves (13) distributed in a circumferential array and four second fan-shaped grooves (14) distributed in a circumferential array are formed in the outer wall of the cylinder (10), the first fan-shaped grooves (13) and the second fan-shaped grooves (14) are staggered by forty-five degrees, the first fan-shaped grooves (13) and the second fan-shaped grooves (14) are all communicated with the first rotating cavity (11), the interiors of the four first fan-shaped grooves (13) are all connected with a first plate (15) in a sliding mode, the interiors of the four second fan-shaped grooves (14) are all connected with a second fan-shaped groove (16) in a sliding mode, the first fan-shaped grooves (17) are connected with a first sliding block (17) on the left side surface of the first fan-shaped grooves (17) in a sliding mode, a first spring (19) is fixedly connected between the first sliding block (18) and the inner wall, close to the axis of the cylinder (10), of the second sliding groove (17), a third sliding groove (20) is formed in the right side surface of the second fan-shaped groove (14), a second sliding block (21) is fixedly connected to the right side surface of the second fan-shaped groove (16), the second sliding block (21) is slidably connected to the inside of the third sliding groove (20), a second spring (22) is fixedly connected between the second sliding block (21) and the inner wall, close to the axis of the cylinder (10), of the third sliding groove (20), a top moving plate (23) is fixedly connected to the inner arc surface of the first fan-shaped plate (15) and the inner arc surface of the second fan-shaped plate (16), two groups of arc-shaped protruding blocks (24) are fixedly connected to the left end of the outer wall of the first rotating shaft (12), the arc-shaped protruding blocks (24) are distributed in a group and are distributed in a circumferential array, the two groups of arc-shaped protruding blocks (24) are staggered by four fifteen degrees, a first rotating shaft (25) is fixedly connected to the right side surface of the first rotating shaft (10), a first rotating shaft (25) is fixedly connected to the first rotating shaft (25), a second rotating shaft (25) is fixedly connected to the first rotating shaft (25), and the first rotating shaft (25) and the second rotating shaft is fixedly connected to the second rotating shaft, the first positioning mechanism is used for fixing the relative position between the first circular ring (26) and the first rotating shaft (12);
A scraping mechanism is also connected between the first circular ring (26) and the cylinder (10), and is used for scraping the solidified polyethylene powder attached to the inner wall of the metal pipeline when the cylinder (10) is taken out of the metal pipeline;
the left side sealing and clamping mechanism and the right side sealing and clamping mechanism are symmetrically arranged;
the scraping mechanism comprises a second rotating cavity (32), a third arc-shaped groove (33), two groups of first arc-shaped grooves (34) and a second arc-shaped groove (35), wherein the second rotating cavity (32) is arranged inside the first rotating shaft (12), the second rotating cavity (32) is internally connected with the second rotating shaft (36) in a rotating way, the two groups of first arc-shaped grooves (34) are all arranged on the outer wall of the first rotating shaft (12), the positions of the two groups of first arc-shaped grooves (34) are respectively corresponding to the positions of the two groups of arc-shaped protruding blocks (24), the middle parts of all arc-shaped protruding blocks (24) are respectively penetrated and are provided with through grooves, all arc-shaped sliding plates (37) are respectively connected with connecting blocks (38) between the second rotating shaft (36), all the connecting blocks (38) are respectively connected with the inner cavities of the adjacent first arc-shaped grooves (34) in a sliding way, the second arc-shaped grooves (35) are respectively arranged on the right side surfaces of the first rotating shaft (12), all the third arc-shaped grooves (33) are respectively provided with through grooves (45), a third sliding block (46) is fixedly connected to the right side wall of the fan-shaped scraper (45), the third sliding block (46) is in sliding fit with the fourth sliding groove (44), and a fifth spring (47) is fixedly connected between the third sliding block (46) and the inner wall, close to the axis of the cylinder (10), of the fourth sliding groove (44);
a second positioning mechanism is connected between the second rotating shaft (36) and the first circular ring (26), and the second positioning mechanism is used for fixing the relative position between the first circular ring (26) and the second rotating shaft (36);
And a clamping mechanism is arranged between the first circular ring (26) and the mounting plate (2), and is used for releasing connection positioning between the first circular ring (26) and the mounting plate (2) when a metal pipeline is required to be sent into the curing device for curing.
2. The production process of the metal pipeline lining plastic coating outside according to claim 1, wherein the lifting supporting device comprises a mounting cavity (5), the middle inside the plastic coating platform is arranged in the mounting cavity (5), a plurality of first sliding grooves (6) which are linearly distributed are formed between the top surface of the mounting cavity (5) and the top surface of the plastic coating platform in a penetrating mode, a first air cylinder (7) is fixedly connected to the bottom surface of the mounting cavity (5), a sliding plate (8) is fixedly connected to the top of a telescopic rod of the first air cylinder (7), the sliding plate (8) is slidably connected to the inner wall of the mounting cavity (5), a plurality of supporting frames (9) which are linearly distributed are fixedly connected to the top surface of the sliding plate (8), all the supporting frames (9) are slidably connected to the corresponding first sliding grooves (6) respectively, the tops of all the supporting frames (9) penetrate through the first sliding grooves (6) and then extend out, and the top surfaces of the supporting frames (9) are in contact with the outer wall of the metal pipeline.
3. The production process of the metal pipeline inner lining plastic coating according to claim 1, wherein the first positioning mechanism comprises a first connecting plate (27), the first connecting plate (27) is fixedly connected to the right end of the outer wall of the first rotating shaft (12), one end, far away from the axis of the cylinder (10), of the first connecting plate (27) is fixedly connected with a first positioning plate (28), a first positioning pin (29) is slidably inserted on the first positioning plate (28), a third spring (30) is fixedly connected between the first positioning pin (29) and the left end face of the first positioning plate (28), and two first positioning holes (31) are formed in the left end face of the first circular ring (26).
4. A production process of plastic-coated metal pipe lining according to claim 3, wherein the second positioning mechanism comprises a second connecting plate (39), the second connecting plate (39) is fixedly connected to the right end of the outer wall of the second rotating shaft (36), the second connecting plate (39) is slidably connected to the inside of the second arc-shaped groove (35), one end, away from the axis of the cylinder (10), of the second connecting plate (39) is fixedly connected with a second positioning plate (40), a second positioning pin (41) is slidably inserted on the second positioning plate (40), a fourth spring (42) is fixedly connected between the second positioning pin (41) and the left end face of the second positioning plate (40), and two second positioning holes (43) are formed in the left end face of the first circular ring (26).
5. A process for producing a metal pipe lining plastic-coated steel according to claim 4, wherein the relative positions of the two first positioning holes (31) and the two second positioning holes (43) are fixed, and the first connecting plate (27) is in contact with the second connecting plate (39).
6. The process for producing the metal pipeline lining plastic coating according to claim 1, wherein the clamping mechanism comprises four clamping blocks (55) and a second circular ring (52), the four clamping blocks (55) are circumferentially arrayed and fixed on the right end face of the first circular ring (26), the clamping blocks (55) are provided with inclined planes (5501) and clamping grooves (5502), the second circular ring (52) is positioned on the right side of the first circular ring (26), the left end face of the second circular ring (52) is provided with four grooves (56) distributed in a circumferential array, the four clamping blocks (55) are respectively inserted into the four grooves (56), the side walls of the four grooves (56) are respectively provided with a third arc-shaped groove (57), the four third arc-shaped grooves (57) are respectively connected with one another in a sliding manner, the second circular ring (52) is inserted into the adjacent clamping grooves (5501) and positioned on the right side face of the first circular ring (26), the four grooves (55) are respectively connected with one end of the connecting rod (60) which is connected with the right side face of the fourth circular ring (56), the connecting rod (60) is connected with the side wall (60) which is connected with the other end of the fourth circular ring (56), the right ends of the four connecting rods (61) penetrate through adjacent arc-shaped sliding grooves (60) and then are fixedly connected with a third circular ring (62), the front side of the left side surface of the third circular ring (62) is fixedly connected with a rack (63), the front side of the right side surface of the second circular ring (52) is fixedly connected with a micro motor (64), the output shaft of the micro motor (64) is fixedly connected with a gear (65), the gear (65) is meshed with the rack (63), the right side circumferential array of the second circular ring (52) is fixedly connected with two second connecting shafts (51), the right ends of the two second connecting shafts (51) are fixedly connected with a disc (50), the circumferential array on the side wall of the first circular ring (26) is penetrated and provided with four jacks (54), the left end of each jack (54) is penetrated through the adjacent first connecting shaft (25), the left end surface of the second circular ring (52) is fixedly connected with four inserting rods (53), and the four inserting rods (53) are respectively inserted into the jacks (54);
a rotary driving mechanism is arranged between the disc (50) and the mounting plate (2), and the rotary driving mechanism is used for driving the disc (50) to rotate.
7. The production process of the metal pipeline inner lining plastic coating according to claim 6, wherein the rotary driving mechanism comprises a motor (48), the motor (48) is fixedly installed on the side wall of the mounting plate (2) opposite to the metal pipeline, an installation frame is fixedly connected with an output shaft end portion of the motor (48) after penetrating through the mounting plate (2), the installation frame is rotationally connected to the side wall of the mounting plate (2), a second air cylinder (49) is fixedly connected to the side wall of the installation frame, and the end portion of a telescopic rod of the second air cylinder (49) is fixedly connected with the disc (50).
8. The production process of the metal pipeline lining plastic coating according to claim 1, wherein the curing device comprises a curing furnace, two rectangular supporting tables are fixedly connected on the bottom surface of the inside of the curing furnace in a bilateral symmetry mode, and rectangular grooves are formed in the top surface of the rectangular supporting tables.
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| CN202310759543.0A CN116748105B (en) | 2023-06-26 | 2023-06-26 | Production process of metal pipeline inner lining plastic and outer coating plastic |
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| CN202310759543.0A CN116748105B (en) | 2023-06-26 | 2023-06-26 | Production process of metal pipeline inner lining plastic and outer coating plastic |
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| CN116748105B true CN116748105B (en) | 2024-05-07 |
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| Publication number | Publication date |
|---|---|
| CN116748105A (en) | 2023-09-15 |
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