CN110919517B

CN110919517B - External anti-corrosion method for oil-water well pipeline

Info

Publication number: CN110919517B
Application number: CN201911250330.5A
Authority: CN
Inventors: 杨浩; 周巨标; 费鸿韬; 刘军; 王进; 韩刚; 徐爱兵; 曹剑锋
Original assignee: China Petroleum and Chemical Corp; Sinopec Jiangsu Oilfield Co
Current assignee: China Petroleum and Chemical Corp; Sinopec Jiangsu Oilfield Co
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-11-27
Anticipated expiration: 2039-12-09
Also published as: CN110919517A

Abstract

The invention relates to an external anticorrosion method for an oil-water well pipeline, which sequentially comprises the following steps: the method comprises the steps of fixing two X-direction guide rails on the ground; mounting special anti-corrosion equipment on the X-direction guide rail; placing two ends of the oil-water well pipeline on the pipeline driving support, wherein the axis of the pipeline is parallel to the X-direction guide rail; the derusting grinding head on the special anticorrosion device falls down and is pressed on the top of the pipeline, then the special anticorrosion device translates towards the other end, the pipeline continuously rotates, and the derusting grinding head rotates at a high speed to derust until reaching the other end of the oil-water well pipeline; fifthly, stopping the derusting grinding head, the special anticorrosion equipment and the pipeline driving support, and then lifting the derusting grinding head; sixthly, leading out the varnished glass fiber cloth from special anti-corrosion equipment and wrapping the varnished glass fiber cloth on an oil-water well pipeline; and the special anti-corrosion equipment returns to the other end for translation, and the oil-water well pipeline continuously rotates, so that the paint-dipped glass fiber cloth is spirally wound on the pipeline. The external corrosion prevention method can complete the external corrosion prevention work of the pipeline safely, efficiently and at low strength.

Description

External anti-corrosion method for oil-water well pipeline

Technical Field

The invention relates to an external corrosion prevention method for an oil-water well pipeline, which is mainly applied to common automatic corrosion prevention work in the external corrosion prevention operation of the pipeline, comprises automatic rust removal, cloth winding, paint brushing and the like, and belongs to the technical field of oil-water well pipeline corrosion prevention.

Background

In the field pipeline external anti-corrosion operation, the cloth needs to be frequently wound and painted, at present, two persons are adopted to lift the pipe, the two persons hold the steel pipe to rotate, the two persons manually wind the cloth, the two persons manually paint the wound cloth, and the circular reciprocating operation is carried out until the construction of four oil and four cloth of one steel pipe is completed. Because no special tool is provided, eight operators are required to cooperate to operate, the labor intensity is high, not only pipe rotation and cloth winding are required, but also manual painting is required, the labor intensity is high, and the efficiency is low. The manual rotating pipe has no stable speed, is purely dependent on the experience of operators, is easy to destabilize by manual cloth winding and manual paint brushing, has high danger, is easy to cause serious mechanical damage, and has larger potential safety hazards and quality hazards.

In addition, the rust removal is time-consuming and labor-consuming, the caused dust is large, the labor protection of workers is not facilitated, the rust removal is easy to be incomplete in the actual work, and even the rust removal step is omitted, the corrosion prevention quality is reduced, and the service life of the pipeline is influenced.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provide an external anti-corrosion method for an oil-water well pipeline, which can save labor, shorten construction time, improve external anti-corrosion efficiency, and complete the external anti-corrosion work of the pipeline safely, efficiently and at low strength.

In order to solve the technical problems, the external corrosion prevention method of the oil-water well pipeline sequentially comprises the following steps: the method comprises the steps that two parallel X-direction guide rails are fixed on the ground on the rear side of a pipeline driving support; mounting special anti-corrosion equipment on the X-direction guide rail; placing two ends of the oil-water well pipeline on the pipeline driving support, wherein the axis of the oil-water well pipeline is parallel to the X-direction guide rail; the derusting grinding head on the special anti-corrosion device falls down and is pressed on the top of one end of the oil-water well pipeline, then the special anti-corrosion device translates towards the other end along the X-direction guide rail, meanwhile, the pipeline driving support drives the oil-water well pipeline to rotate continuously, and the derusting grinding head rotates at a high speed to derust the oil-water well pipeline until the derusting grinding head reaches the other end of the oil-water well pipeline; fifthly, stopping the derusting grinding head, the special anticorrosion equipment and the pipeline driving support, and then lifting the derusting grinding head; sixthly, leading out the varnished glass fiber cloth from special anti-corrosion equipment and wrapping the varnished glass fiber cloth on an oil-water well pipeline; and the special anti-corrosion equipment returns to the other end to translate, and meanwhile, the pipeline driving support drives the oil-water well pipeline to rotate continuously, so that the paint dipping glass fiber cloth is spirally wound on the oil-water well pipeline.

Compared with the prior art, the invention has the following beneficial effects: the invention improves the traditional working procedures of firstly brushing cloth and then brushing paint into the working procedures of firstly brushing paint and then brushing cloth, the paint-dipped glass fiber cloth is wound under the traction of an oil-water well pipeline, once the winding is finished, the glass fiber cloth is stuck on the outer wall of the pipeline and can not be loosened, the lap joint width of the wound cloth is uniform and stable, and the coating amount of the asphalt paint is uniform. The external corrosion prevention of the oil-water well pipeline is changed from manual operation to automatic operation, the labor intensity is reduced, the working efficiency is improved, automatic cloth winding is realized, the number of used workers is reduced from eight workers/time to three workers/time, two workers lift the pipe and feed and discharge, one worker supervises steering, and the unit external corrosion prevention construction time is reduced by more than 60%. The original manual external corrosion prevention requires only ten minutes for finishing the external corrosion prevention of each pipeline, and the external corrosion prevention of each pipeline is finished by adopting the equipment of the invention after only 3.5 minutes. In addition, the invention has good safety, does not need manual pipe rotation and manual painting, avoids the danger of mechanical injury to operators and is beneficial to the labor protection of workers; and the applicability is wide, and the steel pipe used in the oil field can be suitable.

As an improvement of the invention, the method also comprises the following steps: after the paint-dipped glass fiber cloth is wound to the end, the special anti-corrosion equipment returns to the other end to translate until the paint-dipped glass fiber cloth reaches the preset winding layer number; cutting off the paint dipping glass fiber cloth by the self-lifting, and detaching the oil-water well pipeline which is finished with corrosion prevention; the method returns to the step three, and the corrosion prevention of the next oil-water well pipeline is continued. After each pipeline finishes derusting and is wound with cloth, the special anti-corrosion equipment continuously and circularly operates in a reciprocating mode, so that the steel pipe can continuously finish four-oil four-cloth mode, and the working efficiency can be further improved.

As a further improvement of the invention, the special anti-corrosion device comprises a fixed bottom plate supported on two X-direction guide rails, a movable bottom plate is hinged on the fixed bottom plate, an asphalt paint dipping groove is fixed above the middle part of the movable bottom plate, a cloth roller extending along the X direction is arranged behind the asphalt paint dipping groove, a glass fiber cloth roll is wound on the cloth roller, a cloth dipping roller is arranged in the asphalt paint dipping groove, a pair of rollers is arranged in front of the asphalt paint dipping groove, the glass fiber cloth led out from the glass fiber cloth roll bypasses the cloth dipping roller downwards for dipping paint, then passes through the rollers upwards, and the dipped paint glass fiber cloth is wound on the oil-water well pipeline forwards. The two ends of the oil-water well pipeline are supported on a pipe frame to rotate at a constant speed, the liquid level of asphalt paint in an asphalt paint dipping groove is higher than that of a cloth dipping roller, the cloth dipping roller presses glass fiber cloth led out from a glass fiber cloth roll into the asphalt paint to be dipped, then the glass fiber cloth soaked with the asphalt paint enters a roller, redundant floating paint is rolled off, the dipped glass fiber cloth is wound on the periphery of the oil-water well pipeline at a certain angle under the traction of the oil-water well pipeline, the glass fiber cloth roll is synchronously unwound on the cloth dipping roller, a movable bottom plate, the asphalt paint dipping groove, the cloth roller and the like are carried by a fixed bottom plate to synchronously translate along the X direction, and thus the dipped glass fiber cloth is spirally lapped on the periphery of the oil-water well pipeline one by one.

As a further improvement of the invention, the peripheral edge of the movable bottom plate is provided with a rectangular frame standing upwards, two ends of the cloth roller are respectively placed on a pair of cloth roller bearings, central shafts of the two cloth roller bearings are respectively fixed on corresponding cloth rolling wall plates, and the bottoms of the two cloth rolling wall plates are respectively fixed above the front part of the rectangular frame; the top of two batching wallboards is welded respectively has the L shape that upwards extends to damp the support, and the horizontal limit in top of two L shape damping supports stretches out in opposite directions, and the center on the horizontal limit in two tops has connect the damping screw soon, and the lower extreme of two damping screws contacts respectively the end top of cloth roller, and the middle part of two damping screws has connect the damping lock nut soon respectively, and two damping lock nuts press respectively in the horizontal limit in top of L shape damping support. The rectangular frame provides support for the cloth rolling wall plate and the central shaft of the cloth rolling roller bearing; when the glass fiber cloth is pulled, the cloth roller rotates on the cloth roller bearing to unwind the glass fiber cloth roll; the lower ends of the two damping screws symmetrically apply certain damping friction force to the cloth roller, so that the glass fiber cloth before being dipped in paint keeps certain tension, on one hand, the glass fiber cloth roll is prevented from being excessively unwound due to inertia when the tension fluctuates, and on the other hand, the cloth roller can be prevented from jumping and falling off from the two cloth roller bearings.

As a further improvement of the invention, the left end and the right end of the cloth dipping roller are respectively hinged at the lower end of a cloth dipping roller swing arm, the two cloth dipping roller swing arms are in a U shape with a downward opening, the rear ends of the two cloth dipping roller swing arms are hinged on a swing arm shaft, the axis of the swing arm shaft is parallel to the axis of the cloth dipping roller, the two ends of the swing arm shaft are respectively hinged on a swing arm shaft lug, and the front ends of the two swing arm shaft lugs are respectively welded on a rear wall plate of the asphalt paint dipping tank; the swing arm shaft is higher than the cloth dipping roller, and a handle rod extending backwards is connected to the swing arm shaft. Because the length of the oil-water well pipeline is long and the oil-water well pipeline is supported by two ends, certain elastic shaking can be generated during rotation and cloth winding, so that the tension of the paint-dipped glass fiber cloth fluctuates; when the tension on the varnished glass fiber cloth is increased, the cloth dipping roller is lifted upwards, and the swing arm of the cloth dipping roller swings upwards around the axis of the swing arm shaft; when the tension on the dip coating glass fiber cloth is reduced, the dip coating roller is pressed down under the action of the dead weight, and the swing arm of the dip coating roller swings downwards around the axis of the swing arm shaft, so that the tension of the dip coating glass fiber cloth is always similar to the dead weight of the dip coating roller and the swing arm of the dip coating roller, and the tension fluctuation caused by the elastic shaking of the oil-water well pipeline is greatly buffered. When needing to wear the cloth again, push down the handle pole, swing arm axle rotates and lifts up the cloth soaking roller through cloth soaking roller swing arm, and the fine cloth of glass of being convenient for passes downwards.

As a further improvement of the invention, the rollers comprise a movable roller and a fixed roller, the axes of which are parallel to each other and are positioned at the upper side and the lower side of the varnished glass fiber cloth, two ends of the fixed roller are respectively supported in fixed roller bearing blocks, the front end and the rear end of each of the two fixed roller bearing blocks are respectively fixed on a roller vertical support, the bottoms of the corresponding roller vertical supports are respectively welded on a roller support bottom plate, and the roller support bottom plates are respectively fixed at the top of the rear end of the rectangular frame; the tops of the corresponding roller vertical supports are mutually connected through roller support top plates; the two ends of the movable roller are respectively supported in the movable roller bearing blocks, the front side and the rear side of each movable roller bearing block are respectively supported on the opposite end faces of the roller vertical support through vertical caulking grooves, the centers of the tops of the two movable roller bearing blocks are respectively hinged to the lower ends of the roller screw rods, the middle parts of the two roller screw rods are screwed in the roller nuts, the two roller nuts are respectively fixed in the middle parts of the corresponding roller support top plates, and adjusting hand wheels are respectively installed at the tops of the two roller screw rods. The fixed roller and the movable roller rotate oppositely, the paint dipping glass fiber cloth penetrates through a gap between the fixed roller and the movable roller, the roller screw rod is rotated through the adjusting hand wheel, the roller screw rod rotates in the roller nut respectively to enable the heights of two ends of the movable roller to be adjusted, therefore, the gap between the movable roller and the fixed roller can be changed, the rolling residual rate of the paint dipping glass fiber cloth can be adjusted, dripping and waste of asphalt paint are reduced, the working environment is improved, and the environment protection is facilitated.

As a further improvement of the invention, the middle part of the movable bottom plate is hinged on the fixed bottom plate through a central hinge shaft, one side of the rear part of the movable bottom plate is hinged with a horizontal swinging cylinder, the fixed end of the horizontal swinging cylinder is hinged on the outer end of a swinging cylinder support, and the inner end of the swinging cylinder support is welded on the side surface of the middle part of the fixed bottom plate. The transverse axis of the fixed bottom plate is parallel to the axis of the oil-water well pipeline, the movable bottom plate rotates for a certain angle around the axis of the central hinge shaft, so that the axes of the roller, the cloth dipping roller and the cloth rolling roller form an included angle with the axis of the oil-water well pipeline, when the dipping varnish glass fiber cloth is wound on the periphery of the oil-water well pipeline, a stable lead angle can be formed, the glass fiber cloth is relatively fitted on the periphery of the pipeline, the translation speed of the fixed bottom plate is well matched with the rotation speed of the oil-water well pipeline, and the dipping varnish glass fiber cloth can be uniformly wound on the periphery of the oil-water well pipeline. The front end of the movable bottom plate swings leftwards and then winds forwards, the movable bottom plate swings rightwards and then winds backwards, and the four-oil four-cloth external anti-corrosion work can be completed by two reciprocating motions. The piston rod of the horizontal swinging cylinder extends out, so that the rear part of the movable bottom plate can be pushed to swing leftwards; the piston rod of the horizontal swinging cylinder retracts, and the rear part of the movable bottom plate can be pulled to swing rightwards.

As a further improvement of the invention, two transmission shafts extending along the Y direction are mounted below the fixed bottom plate, the two transmission shafts are parallel to each other and symmetrically located at two sides of the front and rear direction axis of the fixed bottom plate, the front and rear ends of the two transmission shafts are respectively provided with rollers, and each roller is respectively supported on a corresponding X-direction guide rail; the outer sides of the front and rear rollers are respectively provided with a transmission shaft bearing, and a bearing seat of each transmission shaft bearing is respectively fixed on the lower end surface of the fixed bottom plate; v-shaped grooves are respectively formed in the middle of the periphery of each roller, each X-direction guide rail is an angle steel with a downward opening, and the V-shaped grooves of the rollers are respectively embedded in the tops of the corresponding X-direction guide rails; the rear end of one of the transmission shafts is provided with a transmission shaft chain wheel, the transmission shaft chain wheel is in transmission connection with a walking chain wheel through a chain, the walking chain wheel is fixed at the output end of a walking reduction gearbox, the bottom of the walking reduction gearbox is fixed on a bottom plate of the reduction gearbox, the bottom plate of the reduction gearbox is welded at the rear side of a fixed bottom plate, and the input end of the walking reduction gearbox is driven by a walking motor (M1). The two transmission shafts synchronously rotate by four rollers, so that the fixed bottom plate can horizontally move along the X-direction guide rail; the axial positioning of the roller and the X-direction guide rail is realized by the matching of the V-shaped groove and the angle steel, so that the distance between the fixed bottom plate and the oil-water well pipeline in the translation process is kept unchanged. The walking motor M1 drives the walking reduction box to operate, the walking reduction box drives the transmission shaft chain wheel to rotate through the walking chain wheel and the chain, the transmission shaft chain wheel drives the transmission shaft to rotate, and the transmission shaft drives the fixed bottom plate to translate along the X-direction guide rail through the roller.

As a further improvement of the invention, the two sides of the front part of the rectangular frame are respectively fixed with a derusting upright post, the tops of the two derusting upright posts are respectively welded with a turntable base which extends outwards, the two turntable bases are respectively supported with a turntable, the centers of the two turntables are respectively provided with a turntable locking screw, and the lower ends of the turntable locking screws are respectively screwed on the turntable bases; the circumference of the two turntables is respectively provided with turntable protruding parts which extend outwards along the radial direction, the two turntable protruding parts are respectively hinged with a derusting swing arm, the free end of the derusting swing arm extends forwards, a derusting grinding head is respectively arranged below the front end heads of the two derusting swing arms, a derusting swing arm lug is respectively arranged below the middle section of the two derusting swing arms, the derusting swing arm lugs are respectively hinged with derusting air cylinders, and the lower ends of the two derusting air cylinders are respectively hinged on corresponding derusting upright posts. When the device is not in a working state, the piston rods of the two rust removing cylinders extend out, and the free end of the rust removing swing arm lifts the rust removing grinding head to a high position and does not contact with an oil-water well pipeline. The rotating disc rotates on the rotating disc base to adjust the included angle between the rust removing swing arm and the axis of the movable bottom plate, so that when the movable bottom plate swings leftwards or rightwards, the rust removing swing arm on the opposite side can point to the oil-water well pipeline along the Y direction, and after the adjustment is accurate, the rotating disc is locked by screwing up the rotating disc locking screw. If rust removal is needed from right to left before winding, the piston rod of the right rust removing cylinder retracts, so that the right rust removing grinding head falls on the oil-water well pipeline, the right rust removing grinding head rotates at a high speed and translates right, and meanwhile, the oil-water well pipeline rotates slowly, so that the outer wall of the oil-water well pipeline can be completely derusted. Similarly, if rust removal is needed from left to right before cloth winding, the piston rod of the left rust removal cylinder retracts, the left rust removal grinding head falls on the oil-water well pipeline, the left rust removal grinding head rotates at a high speed and translates left, and meanwhile, the oil-water well pipeline rotates slowly, so that the outer wall of the oil-water well pipeline can be completely derusted. Compared with manual rust removal, the method saves time and labor, and greatly improves the working efficiency of external corrosion prevention.

As a further improvement of the invention, one end of the fixed plate is provided with a control cabinet, a main loop and a control loop are arranged in the control cabinet, the main loop comprises a frequency converter (E1), and a traveling motor (M1) is connected with the power output end of the frequency converter (E1); the control circuit comprises a PLC, a right-moving button (SB3) is connected to an X2 port of the PLC, and a left-moving button (SB4) is connected to an X3 port of the PLC; an X7 port of the PLC is connected with a normally open contact of a left end limit switch (SQ1), an X10 port of the PLC is connected with a normally open contact of a right end limit switch (SQ2), a Y0 port of the PLC is connected with a coil of a left shift relay (KA1), and the normally open contact of the left shift relay (KA1) is connected with a DI1 port of a frequency converter (E1) in series; a Y1 port of the PLC is connected with a coil of a right shift relay (KA2), and a normally open contact of the right shift relay (KA2) is connected in series with a DI2 port of a frequency converter (E1); the center end of the speed regulation potentiometer (RX) is connected with a rotating speed signal input end AI1 of a frequency converter (E1), two ends of the speed regulation potentiometer (RX) are connected between +10V and GND, and a motor rotating speed output port AO1 of the frequency converter (E1) is connected with a signal input end of a tachometer (SP 1). After button SB3 is moved to the right is pressed, PLC controller's X2 port input low level, PLC controller's Y1 port output high level makes the coil of the relay KA2 that moves to the right get electricity, the normally open contact of the relay KA2 that moves to the right is closed, the DI2 port of converter E1 receives the signal that moves to the right, control walking motor M1 corotation, this equipment is the translation of moving to the right, when the right-hand member of this equipment arrival profit well pipeline, right-hand member limit switch SQ2 is triggered, its normally open contact is closed, PLC controller's X10 port input low level, PLC controller control walking motor M1 parks. Move the back to the left SB4, the X3 port input low level of PLC controller, the Y0 port output high level of PLC controller makes the coil of moving relay KA1 to a left side get electric, the normally open contact of moving relay KA1 to a left side is closed, the DI1 port of converter E1 receives the signal of moving to a left side, control walking motor M1 reversal, this equipment translation left side, when the left end of this equipment arrival profit well pipeline, left end limit switch SQ1 is triggered, its normally open contact is closed, the X7 port input low level of PLC controller, PLC controller control walking motor M1 parks. The set value of the rotating speed is changed by a speed-regulating potentiometer RX, the rotating speed of a walking motor M1 is controlled by a frequency converter E1, so that the translation speed of the equipment along the X direction is controlled, and the rotating speed of the walking motor M1 is sent to a tachometer SP1 by a motor rotating speed output port AO1 to be displayed.

As a further improvement of the invention, the upper cavity of the horizontal swing cylinder is connected with the A port of the swing electromagnetic directional valve (YV3), the lower cavity of the horizontal swing cylinder is connected with the B port of the swing electromagnetic directional valve (YV3), the P port of the swing electromagnetic directional valve (YV3) is connected with a compressed air pipeline, and the swing electromagnetic directional valve (YV3) is a three-position four-way electromagnetic directional valve with the middle position function of O type; the outer side of a cylinder barrel of the horizontal swing cylinder is provided with a left swing limit magnetic switch (SQ3) and a right swing limit magnetic switch (SQ4) for detecting the cylinder stroke, a normally open contact of the left swing limit magnetic switch (SQ3) is connected in series with an X11 port of the PLC, a normally open contact of the right swing limit magnetic switch (SQ4) is connected in series with an X12 port of the PLC, a left coil (YV3-1) of a swing electromagnetic directional valve (YV3) is connected with a Y4 port of the PLC, and a right coil (YV3-2) of the swing electromagnetic directional valve (YV3) is connected with a Y5 port of the PLC. When the left coil YV3-1 of the swing electromagnetic directional valve YV3 is electrified, the P port of the swing electromagnetic directional valve YV3 is communicated with the port A, compressed air enters the upper cavity of the horizontal swing cylinder, air in the lower cavity of the horizontal swing cylinder is discharged from the port B to the port O, the piston rod of the horizontal swing cylinder retracts, and the lower end of the movable bottom plate swings rightwards. When the right coil YV3-2 of the swing electromagnetic directional valve YV3 is electrified, the P port of the swing electromagnetic directional valve YV3 is communicated with the port B, compressed air enters the lower cavity of the horizontal swing cylinder, air in the upper cavity of the horizontal swing cylinder is discharged from the port A to the port O, the piston rod of the horizontal swing cylinder extends out, and the lower end of the movable bottom plate swings leftwards. When the movable bottom plate swings left to place, the normally open contact of the left swing limit magnetic switch SQ3 is closed, the X11 port of the PLC receives a left swing in-place signal, and the Y4 port of the PLC outputs low level to enable the left coil YV3-1 of the swing electromagnetic directional valve YV3 to lose power. When the movable bottom plate swings right to the right position, the normally open contact of the right swing limit magnetic switch SQ4 is closed, the X12 port of the PLC receives a right swing in-place signal, and the Y5 port of the PLC outputs low level to enable the right coil YV3-2 of the swing electromagnetic directional valve YV3 to lose power.

As a further improvement of the invention, a left rust removing button (SA1) is connected to an X4 port of the PLC, and a right rust removing button (SA2) is connected to an X5 port of the PLC; the coil of the left rust removing electromagnetic valve (YV1) is connected in series with the Y2 port of the PLC controller, and the coil of the right rust removing electromagnetic valve (YV2) is connected in series with the Y3 port of the PLC controller; the lower cavity of the left rust removing cylinder is connected with the port A of a left rust removing electromagnetic valve (YV1), the upper cavity of the left rust removing cylinder is connected with the port B of the left rust removing electromagnetic valve (YV1), and the port P of the left rust removing electromagnetic valve (YV1) is connected with a compressed air pipeline; the lower cavity of the right de-rusting cylinder is connected with the port A of the right de-rusting electromagnetic valve (YV2), the upper cavity of the right de-rusting cylinder is connected with the port B of the right de-rusting electromagnetic valve (YV2), the port P of the right de-rusting electromagnetic valve (YV2) is connected with a compressed air pipeline, and the left de-rusting electromagnetic valve (YV1) and the right de-rusting electromagnetic valve (YV2) are two-position four-way electromagnetic reversing valves. When the left rust removing electromagnetic valve YV1 and the right rust removing electromagnetic valve YV2 are not electrified, the port P is communicated with the port A, and compressed air enters a lower cavity of the left rust removing cylinder and a lower cavity of the right rust removing cylinder, so that the left rust removing grinding head and the right rust removing grinding head are in a high-position non-working state. The left rust removing button SA1 is pressed, the X4 port of the PLC controller receives a left rust removing signal, the Y2 port of the PLC controller controls the coil of the left rust removing electromagnetic valve YV1 to be electrified, the left rust removing electromagnetic valve YV1 is electrified, the P port of the left rust removing electromagnetic valve YV1 is communicated with the B port, compressed air enters the upper cavity of the left rust removing cylinder, the piston rod of the left rust removing cylinder retracts, and the left rust removing grinding head falls down and is pressed on a pipeline. The right rust removing button SA2 is pressed, the X5 port of the PLC receives a right rust removing signal, the Y3 port of the PLC controls the coil of the right rust removing electromagnetic valve YV2 to be electrified, the P port of the right rust removing electromagnetic valve YV2 is communicated with the B port, compressed air enters the upper cavity of the right rust removing cylinder, the piston rod of the right rust removing cylinder retracts, and the right rust removing grinding head falls down and is pressed on a pipeline.

Drawings

The invention will be described in further detail with reference to the following drawings and detailed description, which are provided for reference and illustration purposes only and are not intended to limit the invention.

FIG. 1 is a front view of the special corrosion prevention apparatus of the present invention.

Fig. 2 is a front view of fig. 1 with the roll omitted.

Fig. 3 is a left side view of fig. 1 without the drip-preventing pan, the cloth roller and the rust removing device.

Fig. 4 is a left side view of fig. 1 without the drip-preventing pan, the roller and the rust removing device.

FIG. 5 is a working state diagram of the invention when rust removal is carried out rightwards.

FIG. 6 is a working state diagram of the present invention when winding cloth to the right.

Fig. 7 is a working state diagram of the invention when winding cloth leftwards.

Fig. 8 is a schematic diagram of the gas circuit of the present invention.

Fig. 9 is a main circuit diagram of the electrical system of the present invention.

Fig. 10 is a control circuit diagram of the electrical system of the present invention.

In the figure: 1. fixing the bottom plate; 1a, fixing an arc-shaped groove of a bottom plate; 1b, a limiting pin shaft; 1c, locking nuts of limiting pin shafts; 1d, swinging a cylinder support; 2. a movable bottom plate; 2a, a central hinge shaft; 2b, locking a central hinge shaft; 3. a rectangular frame; 4. a cloth roller; 4a, rolling glass fiber cloth; 4b, a cloth roller bearing; 4c, rolling the cloth wallboard; 4d.L form damping support; 4e, damping screw; 4f, damping lock nuts; 4g, a cloth rolling hand wheel; 5. dipping the asphalt paint in a tank; 5a, a swing arm shaft lug; 6. a cloth dipping roller; 6a, swinging an arm of the cloth soaking roller; 6b, swinging arm shafts; 6c, a handle bar; 7. fixing the roller; 7a, fixing a roller bearing seat; 8. a movable roller; 8a, a movable roll chock; 8b, a roller bracket bottom plate; 8c, vertical roller supports; 8d, a roller support top plate; 8e, rolling a screw rod; 8f, rolling a nut; 8g, adjusting a hand wheel; 9. a drive shaft; 9a, a roller; 9b. a propeller shaft bearing; 9c. a drive shaft sprocket; 10. a walking reduction box; 10a, a walking sprocket; 11. a horizontal swing cylinder; 12. derusting upright posts; 12a, a turntable base; 13. a turntable; a turntable locking screw; 14. derusting swing arms; 14a, derusting a swing arm lug; 15. a left rust removing cylinder; 16. a right de-rusting cylinder; 17. a left rust removing grinding head; 18. a right derusting grinding head; an X-direction guide rail; 20. an oil-water well pipeline; 21. a control cabinet; 22. a drip-proof receiving tray; G1. a compressed air conduit; m1, a walking motor; E1. a frequency converter; rx. a variable-speed potentiometer; SB1. start button; sb2. stop button; sb3. right movement button; SB4, moving the button to the left; sb5. scram button; SA1. left rust removal button; SA2. Right rust removal button; SQ1. left limit switch; SQ2. a right end limit switch; SQ3. left-swing limit magnetic switch; SQ4. right swing limit magnetic switch; KA1, moving the relay to the left; KA2, right shift relay; yv1. left rust removal solenoid valve; yv2. right derusting solenoid valve; yv3. oscillating solenoid directional valve; SP1. tachometer.

Detailed Description

The external anti-corrosion method of the oil-water well pipeline sequentially comprises the following steps: fixing two parallel X-shaped guide rails 19 on the ground on the rear side of a pipeline driving bracket; mounting special anti-corrosion equipment on the X-direction guide rail 19; placing two ends of the oil-water well pipeline on the pipeline driving support, wherein the axis of the oil-water well pipeline is parallel to the X-direction guide rail 19; the derusting grinding head on the special anti-corrosion device falls down and is pressed on the top of one end of the oil-water well pipeline, then the special anti-corrosion device translates towards the other end along the X-direction guide rail 19, the pipeline driving support drives the oil-water well pipeline to rotate continuously, and the derusting grinding head rotates at a high speed to derust the oil-water well pipeline until the derusting grinding head reaches the other end of the oil-water well pipeline; fifthly, stopping the derusting grinding head, the special anticorrosion equipment and the pipeline driving support, and then lifting the derusting grinding head; sixthly, leading out the varnished glass fiber cloth from special anti-corrosion equipment and wrapping the varnished glass fiber cloth on an oil-water well pipeline; and the special anti-corrosion equipment returns to the other end to translate, and meanwhile, the pipeline driving support drives the oil-water well pipeline to rotate continuously, so that the paint dipping glass fiber cloth is spirally wound on the oil-water well pipeline.

Also comprises the following steps: after the paint-dipped glass fiber cloth is wound to the end, the special anti-corrosion equipment returns to the other end to translate until the paint-dipped glass fiber cloth reaches the preset winding layer number; cutting off the paint dipping glass fiber cloth by the self-lifting, and detaching the oil-water well pipeline which is finished with corrosion prevention; the method returns to the step three, and the corrosion prevention of the next oil-water well pipeline is continued.

As shown in fig. 1 to 6, the special anticorrosion device includes a fixed bottom plate supported on two X-direction guide rails 19, a movable bottom plate 2 is hinged on the fixed bottom plate 1, an asphalt paint dipping tank 5 is fixed above the middle portion of the movable bottom plate 2, a cloth roller 4 extending along the X direction is arranged behind the asphalt paint dipping tank 5, a fiberglass cloth roll 4a is wound on the cloth roller 4, a cloth dipping roller 6 is arranged in the asphalt paint dipping tank 5, a pair of rollers is arranged in front of the asphalt paint dipping tank 5, and fiberglass cloth led out from the fiberglass cloth roll 4a passes through the rollers upwards after passing around the cloth dipping roller 6 downwards, and then is wrapped on an oil-water well pipeline 20 forwards.

The two ends of the oil-water well pipeline 20 are supported on a pipe frame to rotate at a constant speed, the asphalt paint liquid level in an asphalt paint immersion groove 5 is higher than that of an immersion cloth roller 6, the immersion cloth roller 6 presses glass fiber cloth led out from a glass fiber cloth roll 4a into the asphalt paint to be immersed, then the glass fiber cloth soaked with the asphalt paint enters a roller, redundant floating paint is rolled off, the immersion paint glass fiber cloth is wound on the periphery of the oil-water well pipeline 20 at a certain angle under the traction of the oil-water well pipeline 20, the glass fiber cloth roll 4a is synchronously unwound on the immersion cloth roller 6, a movable bottom plate 2, the asphalt paint immersion groove 5, the cloth roller 4 and the like are carried by a fixed bottom plate 1 to synchronously translate along the X direction, and the immersion paint glass fiber cloth is wound on the periphery of the oil-water well pipeline 20 in a spiral lap joint mode.

The periphery of the movable bottom plate 2 is provided with an upward-erected rectangular frame 3, two ends of the cloth roller 4 are respectively placed on a pair of cloth roller bearings 4b, central shafts of the two cloth roller bearings 4b are respectively fixed on corresponding cloth rolling wall plates 4c, and the bottoms of the two cloth rolling wall plates 4c are respectively fixed above the front part of the rectangular frame 3; the top of two batching wallboards 4c has welded the L shape that upwards extends damping support 4d respectively, and the top horizontal limit of two L shape damping supports 4d stretches out in opposite directions, and the center on two top horizontal limits has connect damping screw 4e soon, and the lower extreme of two damping screw 4e contacts respectively at the end top of cloth roller 4, and the middle part of two damping screw 4e has connect damping lock nut 4f soon respectively, and two damping lock nut 4f press respectively in the top horizontal limit top of L shape damping support 4d. The rectangular frame 3 provides support for the cloth rolling wall plate 4c and the central shaft of the cloth rolling roller bearing; when the glass fiber cloth is pulled, the cloth roller 4 rotates on the cloth roller bearing 4b, so that the glass fiber cloth roll 4a is unwound; the lower ends of the two damping screws 4e symmetrically apply certain damping friction force to the cloth roller 4, so that the glass fiber cloth before being dipped in paint keeps certain tension, on one hand, the glass fiber cloth roll 4a is prevented from being excessively unwound due to inertia when the tension fluctuates, and on the other hand, the cloth roller 4 can be prevented from jumping and falling off from the two cloth roller bearings 4b. A cloth rolling hand wheel 4g is arranged at one end of the cloth rolling roller 4, and the cloth rolling hand wheel 4g can be rotated to keep the glass fiber cloth roll 4a in a tensioning state when the glass fiber cloth roll 4a is loosened.

The left end and the right end of the cloth dipping roller 6 are respectively hinged to the lower end of a cloth dipping roller swing arm 6a, the two cloth dipping roller swing arms 6a are U-shaped with downward openings, the rear ends of the two cloth dipping roller swing arms 6a are hinged to a swing arm shaft 6b, the axis of the swing arm shaft 6b is parallel to the axis of the cloth dipping roller 6, the two ends of the swing arm shaft 6b are respectively hinged to swing arm shaft lugs 5a, and the front ends of the two swing arm shaft lugs 5a are respectively welded to the rear wall plate of the asphalt paint dipping tank 5. Because the length of the oil-water well pipeline 20 is long and is only supported by two ends, certain elastic shaking can be generated during rotation and cloth winding, so that the tension of the paint-dipped glass fiber cloth fluctuates; when the tension on the varnished fiberglass cloth is increased, the cloth dipping roller 6 is lifted upwards, and the swing arm 6a of the cloth dipping roller swings upwards around the axis of the swing arm shaft 6 b; when the tension on the paint-impregnated fiberglass cloth is reduced, the cloth-impregnating roller 6 is pressed down under the action of self-weight, and the swing arm 6a of the cloth-impregnating roller swings downwards around the axis of the swing arm shaft 6b, so that the tension of the paint-impregnated fiberglass cloth is always similar to the self-weight of the cloth-impregnating roller 6 and the swing arm 6a of the cloth-impregnating roller, and the tension fluctuation caused by the elastic shaking of the oil-water well pipeline 20 is greatly buffered.

The swing arm shaft 6b is higher than the cloth soaking roller 6, and a handle rod 6c extending backwards is connected to the swing arm shaft 6b. When the cloth needs to be put through again, the handle rod 6c is pressed down, the swing arm shaft 6b rotates to lift the cloth soaking roller 6 through the cloth soaking roller swing arm 6a, and the glass fiber cloth can conveniently penetrate downwards.

The roller comprises a movable roller 8 and a fixed roller 7, the axes of the movable roller 8 and the fixed roller 7 are parallel to each other and are positioned on the upper side and the lower side of the paint dipping glass fiber cloth, two ends of the fixed roller 7 are respectively supported in fixed roller bearing blocks 7a, the front end and the rear end of each of the two fixed roller bearing blocks 7a are respectively fixed on a roller vertical support 8c, the bottom of the corresponding roller vertical support 8c is respectively welded on a roller support bottom plate 8b, and the roller support bottom plate 8b is respectively fixed on the top of the rear end of the rectangular; the tops of the corresponding roller vertical supports 8c are connected with each other through roller support top plates 8 d; the two ends of the movable roller 8 are respectively supported in movable roller bearing blocks 8a, the front side and the rear side of each of the two movable roller bearing blocks 8a are respectively supported on the opposite end faces of a roller vertical support 8c through vertical caulking grooves, the centers of the tops of the two movable roller bearing blocks 8a are respectively hinged at the lower ends of roller screw rods 8e, the middle parts of the two roller screw rods 8e are screwed in roller nuts 8f, the two roller nuts 8f are respectively fixed in the middle parts of corresponding roller support top plates 8d, and adjusting hand wheels 8g are respectively installed at the tops of the two roller screw rods 8e.

The fixed roller 7 and the movable roller 8 rotate oppositely, the paint dipping glass fiber cloth penetrates through a gap between the fixed roller 7 and the movable roller 8, the roller screw 8e is rotated through the adjusting hand wheel 8g, the roller screw 8e rotates in the roller nut 8f respectively to enable the heights of two ends of the movable roller 8 to be adjusted, therefore, the gap between the movable roller 8 and the fixed roller 7 can be changed, the rolling residual rate of the paint dipping glass fiber cloth can be adjusted, and dripping and waste of asphalt paint are reduced.

The middle part of the movable bottom plate 2 is hinged on the fixed bottom plate 1 through a central hinge shaft 2a, the rear part of the fixed bottom plate 1 is provided with a fixed bottom plate arc-shaped groove 1a, and the fixed bottom plate arc-shaped groove 1a takes the axis of the central hinge shaft 2a as the center and is symmetrically distributed on two sides of the axis of the fixed bottom plate in the front and back directions; a limit pin shaft 1b is inserted in the arc-shaped groove 1a of the fixed bottom plate, and the limit pin shaft 1b is fixed at the center of the rear part of the movable bottom plate 2.

The transverse axis of the fixed bottom plate 1 is parallel to the axis of the oil-water well pipeline 20, the movable bottom plate 2 rotates for a certain angle around the axis of the central hinge shaft 2a, so that the axes of the roller, the cloth soaking roller 6 and the cloth rolling roller 4 form an included angle with the axis of the oil-water well pipeline 20, when the paint soaking glass fiber cloth is wound on the periphery of the oil-water well pipeline 20, a stable lead angle can be formed, the glass fiber cloth is relatively attached to the periphery of the pipeline, the translation speed of the fixed bottom plate 1 is well matched with the rotation speed of the oil-water well pipeline 20, and the paint soaking glass fiber cloth can be uniformly wound on the periphery of the oil-water well pipeline 20. The front end of the movable bottom plate 2 swings leftwards and then winds forwards, the movable bottom plate 2 swings rightwards and then winds backwards, and the four-oil four-cloth external anti-corrosion work can be completed by two reciprocating motions.

When the front end of the movable bottom plate 2 swings leftwards, the limit pin shaft 1b slides to the right end of the arc-shaped groove 1a of the fixed bottom plate, and the limit is obtained; when the front end of the movable bottom plate 2 swings rightwards, the limiting pin shaft 1b slides to the left end of the arc-shaped groove 1a of the fixed bottom plate to obtain limiting; thus, the limit angle of the movable bottom plate 2 swinging to the left and the right can be limited.

The large-end flash of the central hinge shaft 2a is pressed on the upper end face of the movable bottom plate 2, the lower end of the central hinge shaft 2a is screwed with a central hinge shaft locking nut 2b, and the central hinge shaft locking nut 2b is positioned below the fixed bottom plate 1; the big end flash of the limit pin shaft 1b is pressed below the arc-shaped groove 1a of the fixed bottom plate, the upper end of the limit pin shaft 1b is screwed with a limit pin shaft locking nut 1c, and the limit pin shaft locking nut 1c is pressed above the movable bottom plate 2. The big end of the central hinge shaft 2a is arranged on the upper part, the big end of the limit pin shaft 1b is arranged on the lower part, and the fixed bottom plate 1 and the movable bottom plate 2 are respectively limited between the big end flash and the nut, so that the movable bottom plate 2 can be ensured to automatically rotate on the fixed bottom plate 1, and the movable bottom plate 2 can be prevented from jumping relative to the fixed bottom plate 1 in the advancing process.

One side of the rear part of the movable bottom plate 2 is hinged with a horizontal swing cylinder 11, the fixed end of the horizontal swing cylinder 11 is hinged with the outer end of a swing cylinder support 1d, and the inner end of the swing cylinder support 1d is welded on the side surface of the middle part of the fixed bottom plate 1. The piston rod of the horizontal swinging cylinder 11 extends out, so that the rear part of the movable bottom plate 2 can be pushed to swing leftwards; the piston rod of the horizontal swinging cylinder 11 retracts, so that the rear part of the movable bottom plate 2 can be pulled to swing rightwards.

Two transmission shafts 9 extending along the Y direction are arranged below the fixed bottom plate 1, the two transmission shafts 9 are parallel to each other and symmetrically positioned at two sides of the front and rear direction axes of the fixed bottom plate, rollers 9a are respectively arranged at the front and rear ends of the two transmission shafts 9, and each roller 9a is respectively supported on a corresponding X-direction guide rail 19; the outer sides of the front and rear rollers 9a are respectively provided with a transmission shaft bearing 9b, and a bearing seat of each transmission shaft bearing 9b is respectively fixed on the lower end surface of the fixed bottom plate 1; the middle part of the periphery of each roller 9a is respectively provided with a V-shaped groove, each X-shaped guide rail 19 is respectively an angle steel with a downward opening, and the V-shaped grooves of the rollers 9a are respectively embedded in the tops of the corresponding X-shaped guide rails 19. The two transmission shafts 9 are provided with four rollers 9a which rotate synchronously, so that the fixed bottom plate 1 can translate along the X-direction guide rail 19; the axial positioning of the roller 9a and the X-direction guide rail 19 is realized by the matching of the V-shaped groove and the angle steel, so that the distance between the fixed bottom plate 1 and the oil-water well pipeline 20 in the translation process is kept unchanged.

The rear end of one of the transmission shafts 9 is provided with a transmission shaft chain wheel 9c, the transmission shaft chain wheel 9c is in transmission connection with a walking chain wheel 10a through a chain, the walking chain wheel 10a is fixed at the output end of the walking reduction gearbox 10, the bottom of the walking reduction gearbox 10 is fixed on the bottom plate of the reduction gearbox, the bottom plate of the reduction gearbox is welded at the rear side of the fixed bottom plate 1, and the input end of the walking reduction gearbox 10 is driven by a walking motor M1. The walking motor M1 drives the walking reduction box 10 to operate, the walking reduction box 10 drives the transmission shaft chain wheel 9c to rotate through the walking chain wheel 10a and the chain, the transmission shaft chain wheel 9c drives the transmission shaft 9 to rotate, and the transmission shaft 9 drives the fixed bottom plate 1 to translate along the X-direction guide rail 19 through the roller 9a.

The two sides of the front part of the rectangular frame 3 are respectively fixed with a derusting upright post 12, the tops of the two derusting upright posts 12 are respectively welded with a rotary table base 12a which extends outwards, rotary tables 13 are respectively supported on the two rotary table bases 12a, the centers of the two rotary tables 13 are respectively provided with rotary table locking screws 13a, and the lower ends of the rotary table locking screws 13a are respectively screwed on the rotary table bases 12 a; the circumferences of the two rotary tables 13 are respectively provided with rotary table protruding parts extending outwards along the radial direction, the two rotary table protruding parts are respectively hinged with a derusting swing arm 14, the free end of the derusting swing arm 14 extends forwards, derusting grinding heads are respectively arranged below the front ends of the two derusting swing arms 14, derusting swing arm lugs 14a are respectively arranged below the middle sections of the two derusting swing arms 14, derusting cylinders are respectively hinged on the derusting swing arm lugs 14a, and the lower ends of the two derusting cylinders are respectively hinged on the corresponding derusting upright posts 12.

When the device is not in a working state, the piston rods of the two rust removing cylinders extend out, and the free end of the rust removing swing arm 14 lifts the rust removing grinding head to a high position and does not contact with the oil-water well pipeline 20. The rotating disc 13 rotates on the rotating disc base 12a to adjust the included angle between the derusting swing arm 14 and the axis of the movable bottom plate, so that when the movable bottom plate 2 swings leftwards or rightwards, the derusting swing arm 14 on the opposite side can point to the oil-water well pipeline 20 along the Y direction, and after the adjustment is accurate, the rotating disc locking screw 13a is screwed down to lock the rotating disc 13.

If rust removal is needed from right to left before winding, the piston rod of the right rust removing cylinder 16 retracts, so that the right rust removing grinding head 18 falls on the oil-water well pipeline 20, the right rust removing grinding head 18 rotates at a high speed and translates to the right, and meanwhile, the oil-water well pipeline 20 rotates slowly, so that the outer wall of the oil-water well pipeline 20 can be completely derusted. Similarly, if rust removal is needed from left to right before winding, the piston rod of the left rust removal cylinder 15 retracts, the left rust removal grinding head 17 falls on the oil-water well pipeline 20, the left rust removal grinding head 17 rotates at a high speed and translates left, and meanwhile, the oil-water well pipeline 20 rotates slowly, so that the outer wall of the oil-water well pipeline 20 can be completely derusted. Compared with manual rust removal, the method saves time and labor, and greatly improves the working efficiency of external corrosion prevention.

As shown in fig. 7, the front end of the rectangular frame is fixed with a drip-preventing pan 22 extending forward and upward, the drip-preventing pan 22 is in a trapezoid shape with a wide front and a narrow rear, the front end is located below the oil-water well pipeline winding section, and the rear end is located above the asphalt paint dipping tank. The asphalt paint dropped when the oil-water well pipeline is wound falls on the anti-leaching tray 22 and flows back to the asphalt paint dipping tank, so that the redundant asphalt is prevented from falling on the ground, and the environment protection is facilitated.

As shown in fig. 8, the lower cavity of the left rust removing cylinder 15 is connected with the port a of the left rust removing electromagnetic valve YV1, the upper cavity of the left rust removing cylinder 15 is connected with the port B of the left rust removing electromagnetic valve YV1, and the port P of the left rust removing electromagnetic valve YV1 is connected with the compressed air pipeline G1; the lower cavity of the right derusting cylinder 16 is connected with the port A of the right derusting electromagnetic valve YV2, the upper cavity of the right derusting cylinder 16 is connected with the port B of the right derusting electromagnetic valve YV2, the port P of the right derusting electromagnetic valve YV2 is connected with a compressed air pipeline G1, and the left derusting electromagnetic valve YV1 and the right derusting electromagnetic valve YV2 are two-position four-way electromagnetic reversing valves; an upper cavity of a horizontal swinging cylinder 11 for driving the movable bottom plate 2 to swing left and right is connected with an A port of a swinging electromagnetic directional valve YV3, a lower cavity of the horizontal swinging cylinder 11 is connected with a B port of a swinging electromagnetic directional valve YV3, a P port of the swinging electromagnetic directional valve YV3 is connected with a compressed air pipeline G1, and the swinging electromagnetic directional valve YV3 is a three-position four-way electromagnetic directional valve with O-shaped function as a median function.

When the left rust removing electromagnetic valve YV1 and the right rust removing electromagnetic valve YV2 are not electrified, the port P is communicated with the port A, and compressed air enters the lower cavity of the left rust removing cylinder 15 and the lower cavity of the right rust removing cylinder 16, so that the left rust removing grinding head 17 and the right rust removing grinding head 18 are in a high-position non-working state. When rust removal is needed from left to right, the left rust removal electromagnetic valve YV1 is electrified, the P port of the left rust removal electromagnetic valve YV1 is communicated with the B port, compressed air enters the upper cavity of the left rust removal air cylinder 15, and the left rust removal grinding head 17 falls down to be put into operation. When rust removal is needed from right to left, the right rust removing electromagnetic valve YV2 is electrified, the P port of the right rust removing electromagnetic valve YV2 is communicated with the B port, compressed air enters the upper cavity of the right rust removing air cylinder 16, and the right rust removing grinding head 18 falls down to be put into operation.

When the left coil YV3-1 of the swing electromagnetic directional valve YV3 is electrified, the P port of the swing electromagnetic directional valve YV3 is communicated with the port A, compressed air enters the upper cavity of the horizontal swing cylinder 11, air in the lower cavity of the horizontal swing cylinder is discharged from the port B to the port O, the piston rod of the horizontal swing cylinder 11 retracts, and the lower end of the movable bottom plate 2 swings rightwards. When the right coil YV3-2 of the swing electromagnetic directional valve YV3 is electrified, the P port of the swing electromagnetic directional valve YV3 is communicated with the port B, compressed air enters the lower cavity of the horizontal swing cylinder 11, air in the upper cavity of the horizontal swing cylinder is discharged from the port A to the port O, a piston rod of the horizontal swing cylinder 11 extends out, and the lower end of the movable bottom plate 2 swings leftwards.

As shown in fig. 9 and 10, a control cabinet 21 is installed at one end of the fixing plate, a main loop and a control loop are installed in the control cabinet 21, the main loop includes a frequency converter E1, and a traveling motor M1 is connected with a power output end of the frequency converter E1; the control circuit comprises a PLC, a right-moving button SB3 is connected to an X2 port of the PLC, and a left-moving button SB4 is connected to an X3 port of the PLC; an X7 port of the PLC is connected with a normally open contact of a left-end limit switch SQ1, an X10 port of the PLC is connected with a normally open contact of a right-end limit switch SQ2, a Y0 port of the PLC is connected with a coil of a left-shift relay KA1, and the normally open contact of the left-shift relay KA1 is connected with a DI1 port of a frequency converter E1 in series; the Y1 port of the PLC controller is connected with a coil of a right shift relay KA2, and a normally open contact of the right shift relay KA2 is connected in series with the DI2 port of the frequency converter E1.

After a right-moving button SB3 is pressed, a low level is input from an X2 port of a PLC controller, a high level is output from a Y1 port of the PLC controller to enable a coil of a right-moving relay KA2 to be electrified, a normally open contact of the right-moving relay KA2 is closed, a DI2 port of a frequency converter E1 receives a right-moving signal, a walking motor M1 is controlled to rotate positively, the equipment moves rightwards, when the equipment reaches the right end of an oil-water well pipeline 20, a right-end limit switch SQ2 is triggered, the normally open contact of the equipment is closed, a low level is input from an X10 port of the PLC controller, and the walking motor M1 is controlled by the PLC controller to stop.

Move the back to the left SB4, PLC controller's X3 port input low level, PLC controller's Y0 port output high level makes the coil of moving relay KA1 to a left side get electric, move relay KA 1's normally open contact closure to a left side, converter E1's DI1 port receives the signal of moving to a left side, control walking motor M1 reversal, this equipment is the translation left, when this equipment reachs the left end of oil-water well pipeline 20, left end limit switch SQ1 is triggered, its normally open contact closure, PLC controller's X7 port input low level, PLC controller control walking motor M1 parks.

The outer side of a cylinder barrel of the horizontal swing cylinder 11 is provided with a left swing limit magnetic switch SQ3 and a right swing limit magnetic switch SQ4 for detecting the cylinder stroke, a normally open contact of the left swing limit magnetic switch SQ3 is connected in series with an X11 port of the PLC controller, a normally open contact of the right swing limit magnetic switch SQ4 is connected in series with an X12 port of the PLC controller, a left coil YV3-1 of a swing electromagnetic directional valve YV3 is connected with a Y4 port of the PLC controller, and a right coil YV3-2 of the swing electromagnetic directional valve YV3 is connected with a Y5 port of the PLC controller.

When the movable bottom plate 2 swings left to be in place, the normally open contact of the left swing limit magnetic switch SQ3 is closed, the X11 port of the PLC receives a left swing in-place signal, and the Y4 port of the PLC outputs low level to enable the left coil YV3-1 of the swing electromagnetic directional valve YV3 to be powered off. When the movable bottom plate 2 swings right to the right position, the normally open contact of the right swing limit magnetic switch SQ4 is closed, the X12 port of the PLC receives a right swing in-place signal, and the Y5 port of the PLC outputs low level to enable the right coil YV3-2 of the swing electromagnetic directional valve YV3 to lose power.

The X4 port of the PLC is connected with a left rust removing button SA1, and the X5 port of the PLC is connected with a right rust removing button SA 2; the coil of the left rust removing electromagnetic valve YV1 is connected in series with the Y2 port of the PLC controller, and the coil of the right rust removing electromagnetic valve YV2 is connected in series with the Y3 port of the PLC controller. When the left rust removing button SA1 is pressed down, the X4 port of the PLC controller receives a left rust removing signal, and the Y2 port of the PLC controller controls the coil of the left rust removing electromagnetic valve YV1 to be electrified, so that the piston rod of the left rust removing air cylinder 15 retracts, and the left rust removing grinding head 17 falls to a working position. The right rust removing button SA2 is pressed, the X5 port of the PLC receives a right rust removing signal, the Y3 port of the PLC controls the coil of the right rust removing electromagnetic valve YV2 to be electrified, the piston rod of the right rust removing cylinder 16 retracts, and the right rust removing grinding head 18 falls to a working position.

The port X0 of the PLC controller is connected with a start button SB1, the port X1 of the PLC controller is connected with a stop button SB2, the port X6 of the PLC controller is connected with an emergency stop button SB5, the center end of a speed-regulating potentiometer RX is connected with a rotating speed signal input end AI1 of a frequency converter E1, two ends of the speed-regulating potentiometer RX are connected between +10V and GND, and a motor rotating speed output port AO1 of the frequency converter E1 is connected with a signal input end of a tachometer SP1. The set value of the rotating speed is changed by a speed-regulating potentiometer RX, the rotating speed of a walking motor M1 is controlled by a frequency converter E1, so that the translation speed of the equipment along the X direction is controlled, and the rotating speed of the walking motor M1 is sent to a tachometer SP1 by a motor rotating speed output port AO1 to be displayed.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention. Technical features of the present invention which are not described may be implemented by or using the prior art, and will not be described herein.

Claims

1. An external anticorrosion method for an oil-water well pipeline is characterized by sequentially comprising the following steps: the method comprises the steps that two parallel X-direction guide rails are fixed on the ground on the rear side of a pipeline driving support; mounting special anti-corrosion equipment on the X-direction guide rail; placing two ends of the oil-water well pipeline on the pipeline driving support, wherein the axis of the oil-water well pipeline is parallel to the X-direction guide rail; the derusting grinding head on the special anti-corrosion device falls down and is pressed on the top of one end of the oil-water well pipeline, then the special anti-corrosion device translates towards the other end along the X-direction guide rail, meanwhile, the pipeline driving support drives the oil-water well pipeline to rotate continuously, and the derusting grinding head rotates at a high speed to derust the oil-water well pipeline until the derusting grinding head reaches the other end of the oil-water well pipeline; fifthly, stopping the derusting grinding head, the special anticorrosion equipment and the pipeline driving support, and then lifting the derusting grinding head; sixthly, leading out the varnished glass fiber cloth from special anti-corrosion equipment and wrapping the varnished glass fiber cloth on an oil-water well pipeline; the special anti-corrosion equipment returns to the other end to translate, and meanwhile, the pipeline driving support drives the oil-water well pipeline to rotate continuously, so that the paint dipping glass fiber cloth is wound on the oil-water well pipeline in a spiral shape; after the paint-dipped glass fiber cloth is wound to the end, the special anti-corrosion equipment returns to the other end to translate until the paint-dipped glass fiber cloth reaches the preset winding layer number; cutting off the paint dipping glass fiber cloth by the self-lifting, and detaching the oil-water well pipeline which is finished with corrosion prevention; the method returns to the step three, and the corrosion prevention of the next oil-water well pipeline is continued; the special anti-corrosion equipment comprises a fixed base plate supported on two X-direction guide rails, a movable base plate is hinged to the fixed base plate, an asphalt paint dipping groove is fixed above the middle of the movable base plate, a cloth roller extending along the X direction is arranged behind the asphalt paint dipping groove, a glass fiber cloth roll is wound on the cloth roller, a cloth dipping roller is arranged in the asphalt paint dipping groove, a pair of rollers is arranged in front of the asphalt paint dipping groove, glass fiber cloth led out from the glass fiber cloth roll is wound downwards around the cloth dipping roller to dip paint, then upwards penetrates through the rollers, and the dipped paint glass fiber cloth is wound forwards on the oil-water well pipeline.

2. The external corrosion prevention method for the oil-water well pipeline according to claim 1, characterized in that: the periphery of the movable bottom plate is provided with an upward-erected rectangular frame, two ends of the cloth roller are respectively placed on a pair of cloth roller bearings, central shafts of the two cloth roller bearings are respectively fixed on corresponding cloth rolling wall plates, and the bottoms of the two cloth rolling wall plates are respectively fixed above the front part of the rectangular frame; the top of two batching wallboards is welded respectively has the L shape that upwards extends to damp the support, and the horizontal limit in top of two L shape damping supports stretches out in opposite directions, and the center on the horizontal limit in two tops has connect the damping screw soon, and the lower extreme of two damping screws contacts respectively the end top of cloth roller, and the middle part of two damping screws has connect the damping lock nut soon respectively, and two damping lock nuts press respectively in the horizontal limit in top of L shape damping support.

3. The external corrosion prevention method for the oil-water well pipeline according to claim 2, characterized in that: the left end and the right end of the cloth dipping roller are respectively hinged to the lower end of a cloth dipping roller swing arm, the two cloth dipping roller swing arms are in a U shape with a downward opening, the rear ends of the two cloth dipping roller swing arms are hinged to a swing arm shaft, the axis of the swing arm shaft is parallel to the axis of the cloth dipping roller, the two ends of the swing arm shaft are respectively hinged to swing arm shaft lugs, and the front ends of the two swing arm shaft lugs are respectively welded on a rear wall plate of the asphalt paint dipping tank; the swing arm shaft is higher than the cloth dipping roller, and a handle rod extending backwards is connected to the swing arm shaft.

4. The external corrosion prevention method for the oil-water well pipeline according to claim 2, characterized in that: the roller comprises a movable roller and a fixed roller, the axes of the movable roller and the fixed roller are parallel to each other and are positioned on the upper side and the lower side of the paint dipping glass fiber cloth, two ends of the fixed roller are respectively supported in fixed roller bearing blocks, the front end and the rear end of each fixed roller bearing block are respectively fixed on a roller vertical support, the bottoms of the corresponding roller vertical supports are respectively welded on a roller support bottom plate, and the roller support bottom plates are respectively fixed on the top of the rear end of the rectangular frame; the tops of the corresponding roller vertical supports are mutually connected through roller support top plates; the two ends of the movable roller are respectively supported in the movable roller bearing blocks, the front side and the rear side of each movable roller bearing block are respectively supported on the opposite end faces of the roller vertical support through vertical caulking grooves, the centers of the tops of the two movable roller bearing blocks are respectively hinged to the lower ends of the roller screw rods, the middle parts of the two roller screw rods are screwed in the roller nuts, the two roller nuts are respectively fixed in the middle parts of the corresponding roller support top plates, and adjusting hand wheels are respectively installed at the tops of the two roller screw rods.

5. The external corrosion prevention method for the oil-water well pipeline according to claim 1, characterized in that: the middle part of the movable bottom plate is hinged to the fixed bottom plate through a central hinge shaft, one side of the rear part of the movable bottom plate is hinged to a horizontal swinging cylinder, the fixed end of the horizontal swinging cylinder is hinged to the outer end of a swinging cylinder support, and the inner end of the swinging cylinder support is welded to the side face of the middle part of the fixed bottom plate.

6. The external corrosion prevention method for the oil-water well pipeline according to claim 2, characterized in that: two transmission shafts extending along the Y direction are arranged below the fixed bottom plate, the two transmission shafts are parallel to each other and symmetrically positioned on two sides of the axis of the fixed bottom plate in the front-back direction, rollers are respectively arranged at the front end and the back end of each transmission shaft, and each roller is respectively supported on a corresponding X-direction guide rail; the outer sides of the front and rear rollers are respectively provided with a transmission shaft bearing, and a bearing seat of each transmission shaft bearing is respectively fixed on the lower end surface of the fixed bottom plate; v-shaped grooves are respectively formed in the middle of the periphery of each roller, each X-direction guide rail is an angle steel with a downward opening, and the V-shaped grooves of the rollers are respectively embedded in the tops of the corresponding X-direction guide rails; the rear end of one of the transmission shafts is provided with a transmission shaft chain wheel, the transmission shaft chain wheel is in transmission connection with a walking chain wheel through a chain, the walking chain wheel is fixed at the output end of a walking reduction gearbox, the bottom of the walking reduction gearbox is fixed on a bottom plate of the reduction gearbox, the bottom plate of the reduction gearbox is welded at the rear side of a fixed bottom plate, and the input end of the walking reduction gearbox is driven by a walking motor (M1).

7. The external corrosion prevention method for the oil-water well pipeline according to claim 6, characterized in that: the two sides of the front part of the rectangular frame are respectively fixed with a derusting upright post, the tops of the two derusting upright posts are respectively welded with a turntable base which extends outwards, turntables are respectively supported on the two turntable bases, turntable locking screws are respectively arranged at the centers of the two turntables, and the lower ends of the turntable locking screws are respectively screwed on the turntable bases; the circumference of the two turntables is respectively provided with turntable protruding parts which extend outwards along the radial direction, the two turntable protruding parts are respectively hinged with a derusting swing arm, the free end of the derusting swing arm extends forwards, a derusting grinding head is respectively arranged below the front end heads of the two derusting swing arms, a derusting swing arm lug is respectively arranged below the middle section of the two derusting swing arms, the derusting swing arm lugs are respectively hinged with derusting air cylinders, and the lower ends of the two derusting air cylinders are respectively hinged on corresponding derusting upright posts.

8. The external corrosion prevention method for oil-water well pipelines according to claim 7, characterized in that: a control cabinet is installed at one end of the fixing plate, a main loop and a control loop are installed in the control cabinet, the main loop comprises a frequency converter (E1), and a traveling motor (M1) is connected with a power output end of the frequency converter (E1); the control circuit comprises a PLC, a right-moving button (SB3) is connected to an X2 port of the PLC, and a left-moving button (SB4) is connected to an X3 port of the PLC; an X7 port of the PLC is connected with a normally open contact of a left end limit switch (SQ1), an X10 port of the PLC is connected with a normally open contact of a right end limit switch (SQ2), a Y0 port of the PLC is connected with a coil of a left shift relay (KA1), and the normally open contact of the left shift relay (KA1) is connected with a DI1 port of a frequency converter (E1) in series; a Y1 port of the PLC is connected with a coil of a right shift relay (KA2), and a normally open contact of the right shift relay (KA2) is connected in series with a DI2 port of a frequency converter (E1); the center end of the speed regulation potentiometer (RX) is connected with a rotating speed signal input end AI1 of a frequency converter (E1), two ends of the speed regulation potentiometer (RX) are connected between +10V and GND, and a motor rotating speed output port AO1 of the frequency converter (E1) is connected with a signal input end of a tachometer (SP 1).

9. The external corrosion prevention method for the oil-water well pipeline according to claim 8, characterized in that: the upper cavity of the horizontal swing cylinder is connected with the port A of the swing electromagnetic directional valve (YV3), the lower cavity of the horizontal swing cylinder is connected with the port B of the swing electromagnetic directional valve (YV3), the port P of the swing electromagnetic directional valve (YV3) is connected with a compressed air pipeline, and the swing electromagnetic directional valve (YV3) is a three-position four-way electromagnetic directional valve with the middle position function of O type; the outer side of a cylinder barrel of the horizontal swing cylinder is provided with a left swing limit magnetic switch (SQ3) and a right swing limit magnetic switch (SQ4) for detecting the cylinder stroke, a normally open contact of the left swing limit magnetic switch (SQ3) is connected in series with an X11 port of the PLC, a normally open contact of the right swing limit magnetic switch (SQ4) is connected in series with an X12 port of the PLC, a left coil (YV3-1) of a swing electromagnetic directional valve (YV3) is connected with a Y4 port of the PLC, and a right coil (YV3-2) of the swing electromagnetic directional valve (YV3) is connected with a Y5 port of the PLC.

10. The external corrosion prevention method for an oil-water well pipeline according to claim 9, characterized in that: the X4 port of the PLC is connected with a left rust removing button (SA1), and the X5 port of the PLC is connected with a right rust removing button (SA 2); the coil of the left rust removing electromagnetic valve (YV1) is connected in series with the Y2 port of the PLC controller, and the coil of the right rust removing electromagnetic valve (YV2) is connected in series with the Y3 port of the PLC controller; the lower cavity of the left rust removing cylinder is connected with the port A of a left rust removing electromagnetic valve (YV1), the upper cavity of the left rust removing cylinder is connected with the port B of the left rust removing electromagnetic valve (YV1), and the port P of the left rust removing electromagnetic valve (YV1) is connected with a compressed air pipeline; the lower cavity of the right de-rusting cylinder is connected with the port A of the right de-rusting electromagnetic valve (YV2), the upper cavity of the right de-rusting cylinder is connected with the port B of the right de-rusting electromagnetic valve (YV2), the port P of the right de-rusting electromagnetic valve (YV2) is connected with a compressed air pipeline, and the left de-rusting electromagnetic valve (YV1) and the right de-rusting electromagnetic valve (YV2) are two-position four-way electromagnetic reversing valves.