JPH0663182U - Tube inner surface polymer removal device - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a polymer removing device for the inner surface of a tube, which is capable of efficiently removing the polymer adhering to the inner surface of the tube with a relatively small-scale device. [Structure] A brush 2 made of a piano wire is provided on a brush shaft 1 which is rotated by a flexible shaft 6.
A heater 12 for heating the polymer attached to the inner wall surface of the tube 5 is provided. After the polymer is softened by the heater 12, the polymer is removed by the brush 2. Since the brush shaft 1 is eccentric by the flexible shaft 6, the mass and rotational moment of the brush shaft 1 itself are applied to the tubes 5 having different curvatures, and the cutting ability of the tubes attached to the inner wall of the tube 5 is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a polymer removing device on the inner surface of a tube, and more particularly to a device suitable for improving the work efficiency of removing a polymer adhering to the inner surface of a high-pressure polyethylene tube of a polymer manufacturing facility of a chemical plant.

[0002]

[Prior art]

 Conventionally, this type of polymer removal equipment uses a chemical cleaning removal method in which a xylene or dichloromethane compound is circulated on the inner surface of the tube to dissolve and wash the polymer, and vapor is sent into the tube to heat the polymer. There are two mechanical removal methods in which the polymer is mechanically removed with a wire brush after softening.

[0003]

[Problems to be solved by the device]

 However, the above-mentioned conventional polymer removal methods have the following drawbacks. The chemical cleaning and removal method requires (1) large-scale equipment such as chemical tanks and chemical circulation equipment, (2) slow chemical reaction speed between polymer and chemicals, and time-consuming cleaning, (3) inside the tube Since chemicals are circulated, it requires a large amount of setup such as connecting pipes. (4) The chemicals used are generally organic solvents, so care must be taken when handling them.

On the other hand, the mechanical removal method (1) requires large-scale equipment such as a boiler, piping, and a valve in order to send the steam into the tube. (2) A state in which the polymer is softened by the steam Since it is necessary to perform brushing at this time, setup work such as timing adjustment becomes large. (3) In the conventional brush, as shown in FIGS. The removal efficiency was low for removing polymers in tubes with different tube diameters or tubes with different curvatures.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a polymer removing device for the inner surface of a tube, which is capable of efficiently removing a polymer with a relatively small-scale facility.

[0006]

[Means for Solving the Problems]

 The purposes described above are: a heater for heating and softening the polymer, a heater moving tool for moving this heater in the tube, and a eccentric rotation with respect to the axis of the tube via a flexible shaft. , A brush that is provided on a brush shaft that is movable in the axial direction of the tube and that has rigidity to cut the polymer after heating, and is achieved.

[0007]

[Action]

 The heater heats the polymer on the inner surface of the tube to soften it. A soft brush is used to cut the softened polymer. The heater moves inside the tube by the heater moving tool, and is then cut by a brush that can move inside the tube. The polymer is heated by a heater that moves inside the tube, not by steam, so a small-scale device is sufficient and the timing of brushing is easy to adjust. The brush can be brushed in a timely manner, and the brush can be eccentric with respect to the axis of the tube, so that the polymer can be efficiently removed even from a tube having a variable curvature or a long tube.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration view showing an embodiment of a polymer removing device for an inner surface of a tube of the present invention, and FIGS. 2 and 3 are enlarged detail views of a main part of FIG. The polymer removing device on the inner surface of the tube includes a brush device including a brush 2 attached to a brush shaft 1 and a heater 12. As shown in FIG. 2, the brush device is provided with brushes 2 radially from a cylindrical brush shaft 1 in the radial direction.

The brush 2 has a diameter of about 1 mm, is made of a piano wire having sufficient rigidity, and is inserted into a hole 4 provided in the brush shaft 1. The hole 4 is slightly larger than the wire diameter of the brush 2 and is provided with a small gap that does not easily fall off when the brush 2 is inserted. The length of the brush 2 is slightly shorter than the inner diameter of the target tube 5, and the brush 2 is formed by inserting it into the brush shaft 1. As shown in FIG. 2B, the brush 2 has irregular lengths in the radial direction from the central axis of the brush shaft 1. The handle 3 of the brush shaft 1 is connected to a flexible shaft 6, and the flexible shaft 6 is connected to an inverter 10 via a feeding device 8 and a motor 9.

On the other hand, the heater 12 has a cartridge heater 16 therein as shown in FIG. 3, and is mounted inside the guide 17 via a guide fixing screw 18. Centering jigs 13 are provided in front of and behind the guides 17, respectively, and the cartridge heater 16 is connected to a cable 20 via a holding jig 19. The lengths of the cartridge heater 16 and the guide 17 are arbitrarily selected according to the curvature of the target tube 5. Further, the polymer removing device for the inner surface of the tube is equipped with a fiberscope 15 for observing the inner surface of the tube 5.

Next, the procedure for removing the polymer by the polymer removing device for the inner surface of the tube having the above structure will be described. First, the heater 12 is fed and positioned by the holding jigs 14 and 19 inside the target tube 5. Then, the power source 11 of the heater 12 is turned on to heat the polymer on the inner surface of the tube 5. The heat of the heater 12 is transmitted to the inner wall of the tube 5 and softens the polymer attached to the inner wall.

While the heater 12 locally heats the inner wall of the tube 5, the holding jigs 14 and 19 slowly move the inside of the tube 5. The softened polymer portion after the heater 12 has moved is gradually cut off while the brush 2 is rotated by the motor 9 via the flexible shaft 6.

The state of polymer removal at this time will be described with reference to FIGS. 5 and 6. When the brush shaft 1 is rotated via the flexible shaft 6, the brush 2 remains inserted without being fixed to the brush shaft 1, so that the rotation of the brush shaft 1 causes the portion of the brush 2 to move toward the tube 5. The brush shaft 1 moves arbitrarily by contact with the inner wall and the polymer 7. That is, since the portion of the brush 2 is not fixed to the brush shaft 1, the lengths of the brush 2 in the radial direction from the central axis of the brush shaft 1 to the inner wall of the tube 5 are different from each other.

When the brush shaft 1 is rotated as it is via the flexible shaft 6 in a state where the center axis of the brush shaft 1 is different from the center axis of the tube 5, the flexible shaft 6 has good followability, so that the brush shaft 1 is A circular motion commensurate with the eccentricity is generated inside 5.

The short side of the brush 2 in the radial direction from the brush shaft 1 is subject to the mass and rotational moment of the brush shaft 1 itself, and the length of the brush 2 is short, so that the brush is bent. Without contacting the inner wall of the tube 5 with rigidity, the polymer has a stronger cutting ability than a general brush having an ordinary uniform axis. When the target tube 5 is a bent tube or the like, it can be easily applied by shortening the axial length of the brush shaft 1 and reducing the number of brushes 2. The polymer scraped off adheres to the brush 2 or remains in the tube 5 as a small lump, so that it is discharged outside the tube 5 such as air after brushing. Finally, the state of polymer removal in the tube 5 is observed and confirmed by the fiberscope 15.

FIG. 4 is a schematic view showing another embodiment of the polymer removing device for the inner surface of the tube of the present invention. The polymer removing device on the inner surface of the tube shows an example in which the heater portion shown in FIG. 1 is removed and a cutting fluid circulating device is incorporated instead. This cutting fluid circulating device is configured to supply the cutting fluid from the tank 21 containing the cutting fluid to the inside of the tube 5 from the nozzle portion 25 via the hose 24 by the pump 23. The tank 21 is installed at a place where the cutting fluid flows out from the tube 5, and the filter 22 removes foreign substances such as polymer scraped off from the inner surface of the tube 5, and only the cutting fluid is collected in the pump 21 and the cutting fluid is circulated and supplied. To be done. By circulating the cutting fluid, it is possible to prevent clogging of the brush 2 and improve the ability of removing the polymer, and it is possible to prevent damage to the inner wall of the tube 5 by the brush 2 due to the lubricating effect of the cutting fluid.

The procedure for removing the polymer is to remove the polymer by rotating the brush 2 with the motor 9 through the flexible shaft 6 while flowing the cutting fluid into the tube 5. Continuously supply and collect.

In the above-mentioned embodiments, an example of removing the polymer adhering to the inner surface of the tube especially in the high-pressure polyethylene manufacturing equipment is shown. It can be applied for removal. Moreover, although the example of the piano wire is shown as an example of the brush, other metallic brushes can be applied as long as they have rigidity equivalent to that of the piano wire.

[0019]

[Effect of device]

 As described above, according to the present invention, the polymer attached to the inner surface of the tube can be mechanically and efficiently removed by a small-scale device without using a chemical such as an organic solvent.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of a polymer removing device for an inner surface of a tube according to the present invention.

FIG. 2 is an enlarged detailed view of a main part of FIG.

FIG. 3 is an enlarged detailed view of a main part of FIG.

FIG. 4 is a schematic view showing another embodiment of the polymer removing device for the inner surface of the tube of the present invention.

FIG. 5A is an explanatory view showing a polymer removal state by the polymer removing device for the inner surface of the tube of the present invention, and FIG. 5B is a side view of FIG.

FIG. 6 (A) is an explanatory view showing a polymer removal state when the brush shaft is eccentric in the tube inner surface polymer removing device of the present invention, and FIG. It is explanatory drawing which shows a rotation condition.

FIG. 7 is an explanatory diagram showing an example of a conventional brush.

FIG. 8A is a front view showing another example of a conventional brush,
(B) is the same side view.

[Explanation of symbols]

 1 Brush Shaft 2 Brush 5 Tube 6 Flexible Shaft 7 Polymer 9 Motor 10 Inverter 11 Power Supply 12 Heater 13 Centering Jig 14 Holding Jig 15 Fiberscope 16 Cartridge Heater 17 Guide 19 Holding Jig 20 Cable

Claims (5)

[Scope of utility model registration request] 1. A device for removing a polymer adhering to the inner surface of a tube, comprising: a heater for heating and softening the polymer; a heater moving tool for moving the heater in the tube; and a flexible shaft. A brush that is eccentrically rotatable with respect to the axial center of the tube and that is provided on a brush shaft that is movable in the axial direction of the tube and that has rigidity to cut the polymer after heating. Polymer removal device on the inner surface of the tube. 2. The polymer removing device for the inner surface of the tube according to claim 1, further comprising a device for observing a condition of removing the polymer in the tube after the polymer is cut with the brush. 3. The polymer on the inner surface of the tube according to claim 1, further comprising a cutting fluid circulation device for circulating and using the cutting fluid for discharging the polymer removed by the brush to the outside of the tube. Removal device. 4. The polymer removing device for the inner surface of a tube according to claim 1, wherein the brush is provided so as to be movable in a radial direction with respect to the brush shaft. 5. The polymer removing device for an inner surface of a tube according to claim 1, wherein the brush is a piano wire.