CN1296143C - Electric heating type inside and outside spraying equipment and process for steel-plastic composite pipe - Google Patents

Abstract

The invention relates to an electrothermal type steel-plastic composite pipe internal and external spraying equipment and a spraying process. The technical problem to be solved is to provide a spraying equipment and process that can spray plastic on the inner and outer walls at the same time, and the coating is uniform, smooth and hygienic. The technical plan is: the device has a workbench, on the longitudinal axis of the workbench, the steel pipe is supported by a pair of runners arranged at both ends, a rotating motor is connected under the runner, and the workbench on both sides of the extension line of the steel pipe axis There are two sliding rails on each side, on which there is a fluidizing cylinder that can move along the sliding rails and an inner spray pipe that is connected to the fluidizing cylinder and is on the same axis as the steel pipe, and a moving motor is installed under the fluidizing cylinder On the top of the steel pipe, an upper slide rail is fixed by a bracket, on which two inverted fluidization cylinders are installed, the lower end of the fluidization cylinder is connected with an outer nozzle pipe, and a moving motor is installed between the two fluidization cylinders. The process is derusting, heating, spraying of inner and outer walls, leveling and solidification, cooling, inspection, and stacking. It can be used in the production industry of water supply and drainage pipelines.

Description

Electrothermal steel-plastic composite pipe internal and external spraying equipment and spraying process

technical field

The invention relates to an electrothermal type steel-plastic composite pipe internal and external spraying equipment and a spraying process. It is suitable for the production industry of water supply and drainage pipelines and fire water supply pipelines.

Background technique

At present, the gas-liquid delivery pipes commonly used, especially the large-diameter civil water supply pipelines and fire-fighting water supply pipelines, are mostly made of steel pipes, and the surface treatment is generally galvanized. Long-term use is easy to corrode and damage, and zinc will also cause secondary damage to tap water. Pollution; and the use of steel-plastic composite pipes can solve this problem. However, the manufacturing technology of steel-plastic composite pipe is very complicated, especially the plastic coating on the inner wall is very difficult, and the inner wall layer is often easy to delaminate, peel off, and have uneven thickness. At the same time, the production speed is also very slow, and it is difficult to form a large-scale Continuous production.

Contents of the invention

The technical problem to be solved by the present invention is to provide an improved electrothermal type steel-plastic composite pipe internal and external spraying equipment and spraying process in view of the above-mentioned problems existing in the production of steel-plastic composite pipes. Plastic, continuous, efficient, and can be mass-produced; the coating wall thickness is uniform and smooth; safe and hygienic, will not cause water pollution; high strength, long service life.

The technical solution adopted in the present invention is: an electric heating type steel-plastic composite pipe internal and external spraying equipment, including a feeding device, an electric heating box, a leveling and curing box, and a cooling frame. Internal and external plastic spraying device, the device has a workbench, on the longitudinal axis of the workbench, the steel pipe is supported by a pair of runners at both ends, and a rotating motor is connected under the runners, on both sides of the extension line of the steel pipe axis There are two sliding rails on the workbench, on which there is a fluidizing cylinder that can move along the sliding rails and an inner spray pipe connected to the fluidizing cylinder and on the same axis as the steel pipe. Mobile motor; on the top of the steel pipe, an upper slide rail is fixed through a bracket, on which two inverted fluidization cylinders are installed, the lower end of the fluidization cylinder is connected with an outer nozzle, and a mobile motor is installed between the two fluidization cylinders.

An electrostatic generator connected to the fluidizing cylinder is also installed on the upper slide rail.

Rollers are installed between the upper and lower rails and each fluidization cylinder.

Both the rotating motor and the moving motor are speed-adjustable motors.

Both the inner nozzle and the outer nozzle have bell mouths.

The internal and external spraying process of the electrothermal steel-plastic composite pipe is:

1) After the steel pipe is derusted, it enters the electric heating box through the feeding device and is heated to 200-220°C;

2) Place the heated steel pipe on the rotating wheel driven by the rotating motor to make the steel pipe rotate at a certain speed. At the same time, the moving motor controls the inner nozzle to translate from both ends to the steel pipe, and the outer nozzle to slide upwards. The rail moves left and right to spray the outer wall of the steel pipe. At the same time, the powder suspended in the fluidized cylinder is sprayed on the inner and outer walls of the steel pipe through the nozzle nozzle under the action of high pressure, and PE powder (polyethylene powder) is sprayed on the inner wall. The outer wall is sprayed with EP powder (epoxy resin powder). In order to prevent the outer wall of EP powder from flying, static electricity is applied when spraying;

3) Put the sprayed steel pipe into the leveling curing box for leveling and curing;

4) Cooling, inspection and stacking.

The beneficial effects of the present invention are: using the equipment of the present invention, the inner and outer walls of the steel pipe can be sprayed with plastic at the same time, the production process is continuous and efficient, and it is suitable for large-scale production; the thickness of the plastic coating on the inner and outer walls is uniform and smooth; the inner wall adopts sanitary grade High-quality plastic, safe and hygienic, will not cause water pollution; the composite pipe has high strength, low cost and long service life.

Description of drawings

Fig. 1 is a structural diagram of the side of the present invention.

Fig. 2 is the A-direction view of the present invention (inner and outer plastic spraying device part).

Fig. 3 is a top view structural view of the present invention.

Detailed ways

As shown in the figure, this embodiment consists of a feeding device 1, an electric heating box 2, a leveling and curing box 3, a cooling frame 4, a workbench 5, a lower rail 6-1, an upper rail 6-2, a fluidization cylinder 7, an electrostatic Generator 8, inner nozzle 9, outer nozzle 10, rotating motor 11-1, moving motor 11-2, runner 12, support 13 and steel pipe 14 form.

In this example, an internal and external plastic spraying device is provided between the electric heating box 2 and the leveling and curing box 3. The device has a fixed workbench 5. On the longitudinal axis of the workbench, a pair of runners 12 are used to support the steel pipe 14. The steel pipe is driven to rotate by the friction of the runner. A rotating motor 11-1 providing power is installed below the runner. Two slide rails 6-1 are respectively arranged on the workbench on both sides of the extension line of the steel pipe axis. There is a fluidization cylinder 7 that can move along the slide rail and an inner spray pipe 9 connected with the fluidization cylinder and on the same axis as the steel pipe. A mobile motor 11-2 is installed under the fluidization cylinder to drive the fluidization cylinder. . Above the steel pipe 14, an upper slide rail 6-2 is fixed by a bracket 13, and an electrostatic generator 8 connected to the fluidized cylinder is also installed on the upper slide rail 6-2. Two inverted fluidization cylinders 7 are installed on the upper slide rail, the outer spray pipe 10 is installed at the lower end of the fluidization cylinders, and a moving motor 11-2 is arranged between the two fluidization cylinders.

For ease of movement, rollers can be installed between the upper and lower rails and each fluidizing cylinder 7 . Both the inner nozzle pipe 9 and the outer nozzle pipe 10 have a bell mouth. Both the rotating motor 11-1 and the moving motor 11-2 are speed-adjustable motors.

Technology of the present invention is:

1) After the steel pipe 14 is derusted, it enters the electric heating box 2 through the feeding device 1, and is heated to 200-220°C;

2) The heated steel pipe 14 is placed on the rotating wheel 12 driven by the rotating motor 11-1, so that the steel pipe rotates at a certain speed, and at the same time, the moving motor 11-2 controls the inner nozzle 9 to translate from both ends to the steel pipe , the outer spray pipe 10 moves left and right on the upper slide rail 6-2 to spray the outer wall of the steel pipe. At the same time, the powder suspended in the fluidization cylinder 7 is sprayed on the inner and outer walls of the steel pipe through the nozzle mouth Above, spray PE powder (polyethylene powder) on the inner wall and EP powder (epoxy resin powder) on the outer wall. In order to prevent the EP powder on the outer wall from flying, static electricity is added when spraying;

3) Put the steel pipe after spraying into the leveling and curing box 3 for leveling and curing;

4) Cooling, inspection and stacking.

Claims (6)

1. electrothermal steel-plastics composite pipe spraying inside and outside equipment, contain pay-off (1), electrocaloric effect (2), levelling solidifies case (3), cooling frame (4), it is characterized in that: between electrocaloric effect and levelling curing case, also be provided with inside and outside plastic-blasting device, this device has a workbench (5), on the longitudinal axis of workbench, hold steel pipe (14) by each pair of turning wheels (12) that is located at two ends, be connected to turning motor (11-1) below the runner, on the workbench on the extended line both sides of steel pipe axial line, respectively be provided with two glidepaths (6-1), have on the glidepath fluidisation tube (7) that can move along slide rail and link to each other with the fluidisation tube and be positioned at inner nozzle (9) on the same axis with steel pipe, travel motor (11-2) is housed below the fluidisation tube; Top in steel pipe (14) is fixed with slide rail (6-2) by support (13), and inverted two fluidisation tubes (7) are housed on it, and fluidisation tube lower end is connected to outer nozzle (10), and travel motor (11-2) is housed between the two fluidisation tubes.

2. electrothermal steel-plastics composite pipe spraying inside and outside equipment according to claim 1 is characterized in that: the electrostatic generator (8) that links to each other with the fluidisation tube also is housed on last slide rail (6-2).

3. electrothermal steel-plastics composite pipe spraying inside and outside equipment according to claim 1 and 2 is characterized in that: between upper and lower slide rail and each the fluidisation tube (7) roller is housed all.

4. electrothermal steel-plastics composite pipe spraying inside and outside equipment according to claim 1 and 2 is characterized in that: described turning motor (11-1) and travel motor (11-2) are adjustable varying-speed motor.

5. electrothermal steel-plastics composite pipe spraying inside and outside equipment according to claim 1 and 2 is characterized in that: inner nozzle (9) and outer nozzle (10) all have horn mouth.

6. electrothermal steel-plastics composite pipe spraying inside and outside technology is characterized in that:

1) steel pipe (14) rust cleaning is heated to 200～220 ℃ after pay-off (1) enters electrocaloric effect (2);

2) steel pipe (14) after will heating is placed on the runner (12) of the rotation that is driven by turning motor (11-1), make steel pipe according to certain speed rotation, simultaneously by the translation in steel pipe of travel motor (11-2) control inner nozzle (9) from two, outer nozzle is then done left and right sides translation at last slide rail (6-2), the outer wall of spraying steel pipe, meanwhile, the powder of fluidisation tube (7) inner suspension is being sprayed on the inside and outside wall of steel pipe through nozzle hole under the effect of high pressure, spray with PE powder (polyethylene powders) at inwall, the outer wall spray is with EP powder (epoxy powder), for preventing that outer wall EP powder from flying upward, static in addition when therefore spraying;

3) steel pipe after will spraying is inserted levelling and is solidified that levelling solidifies in the case (3);

4) cooling, check, stacking.

Images