JPH0524832B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of manufacturing a bent pipe used in a pulverized coal transport pipe, or a bent pipe used to transport fluids that promote wear.

[Conventional technology]

The abrasive transported fluid is, for example, fine powder (mixed in air).
However, as shown in Figure 5, in the transportation system,
There are many bends 54 in the transport pipe 53 from the crushing device 51 to the burner 52, and the bends are exposed to severe wear.

Conventionally, as a wear-resistant measure for the curved pipe portion of a pipe for transporting pulverized coal, etc., there has been a technology that improves the wear resistance inside the curved pipe by bonding ceramics with adhesive to the inner surface of the curved pipe of steel or cast iron pipes. Another technique is to attach a protector made of steel, cast iron, etc. to the inner or outer surface of a curved pipe by welding to improve its strength.

[Problems that the invention/device attempts to solve]

However, when attaching ceramics to the inner surface of a curved pipe, the inner surface of the pipe has a complex curved surface, so it is necessary to manually attach the ceramic plates one by one with adhesive and press them with mechanical pressure each time. It was hot. For this reason, while the crimping device was inside the tube, the next ceramic plate could not be attached, which caused significant problems in terms of work efficiency. Furthermore, there was a risk that the ceramic would crack and fracture if it was crimped using a mechanical device. If mechanical crimping is omitted, there is a risk that the wear-resistant material such as ceramics will fall off, so it is impossible to omit crimping. Furthermore, there was a risk of the bonding part coming off due to the difference in thermal expansion between the main tube and the wear-resistant material such as ceramics, or falling off due to vibration. Further, due to the above-mentioned reason, there was a problem in that the cost required for installation was enormous. Another problem is that the main pipe is made of steel or cast iron, which increases its weight. This is also a common problem regarding how to attach protectors to bent pipes,
Since steel or cast iron was used as the protector, there were problems, especially in terms of weight.

[Means for solving problems]

The object of the present invention is to solve these problems, to effectively utilize lightweight wear-resistant materials such as ceramics, and to reduce the weight of the main pipe material.

That is, the present invention is a method for manufacturing a bent pipe portion of a transport pipe for transporting powder, in which wear-resistant material in the form of small plates is adhered to the inner surface of a bent pipe made of a plastic non-ferrous pipe with an adhesive without any gaps between them. Attach blind plates to both ends of the pipe, attach a mold to the outside as necessary, and gradually pressurize the bent pipe by introducing pressurizing medium into the bent pipe through the introduction pipe and pressure regulating valve provided on one of the blind plates. The present invention provides a method of manufacturing a wear-resistant bent pipe characterized by applying pressure uniformly to the entire inner surface and crimping a wear-resistant material.

[Effect]

In the present invention, a wear-resistant material such as ceramic is pressed into close contact with a base material pipe using a pressure medium. As the pressure medium, thermopressure, hydraulic pressure, hydrothermal pressure, etc. are used. The necessity of heating is determined by the base material and the quality of the base material.

〔Example〕

Next, the present invention will be explained in more detail with reference to Examples. FIG. 1 is a cross-sectional view showing the processing steps of one embodiment of the method for manufacturing a wear-resistant and bend-resistant pipe according to the present invention. In Figure 1, 1 is a plastic non-ferrous main pipe made of FRP, plastic, etc., 2 is a flange part that is integrated with the base material of the plastic non-ferrous main pipe 1, and 4 is heating when a plastic non-ferrous material is used as the main pipe material. Separate molds 5 and 6, which are attached to the outer peripheral surface of the main tube due to strength problems of the main tube material during crimping, are blind plates for sealing the pressure medium inside the main tube 1. In such a configuration, the pressurized medium (hot air, oil pressure, or water pressure may be used) introduced from the pressurized medium introduction pipe 8 is introduced into the main pipe 1 via the on/off and pressure regulating valve 7, and is Lamics 3, which is a small plate piece adhered to the inside of the tube 1 with an adhesive without any gap, is heat-pressed or crimped to the inner wall of the main tube 1. Although not shown, the outer surface of the plastic non-ferrous main tube 1 may be provided with a cooling device when a heating medium is used as the pressure medium.

FIG. 2 is a sectional view taken along line A-A in FIG.
FIG. 3 is a sectional view taken along the line BB in FIG. 1. FIG. 4 is a cross-sectional view of a finished plastic nonferrous wear-resistant tube according to the present invention.

[Effects of inventions and ideas]

(1) Since plastic non-ferrous materials (such as FRP, plastic, etc.) are used as the main pipe material, significant weight reduction can be achieved.

(2) Mechanical crimping is not required for crimping wear-resistant materials such as ceramics, so there is no need to alternate between pasting and crimping, which greatly increases work efficiency, and because pressure is gradually applied using a pressure medium. There is no risk of damage due to cracks in the ceramic.

(3) Due to reason 2 above, workability is improved, and wear-resistant materials such as ceramics can be divided into small plate pieces and bonded together, so the main pipe has good expansion and contraction flexibility, and the bonded parts will peel off due to thermal expansion bonding. The risk of falling off due to this or vibration is significantly reduced.

(4) Since mechanical crimping is not required, a significant reduction in man-hours can be achieved and a significant cost reduction can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the processing steps of one embodiment of the method for manufacturing a wear-resistant bent pipe according to the present invention, and FIG.
The figures are a cross-sectional view taken along the line A-A in FIG. 1, FIG. 3 is a cross-sectional view taken along the line B-B in FIG. FIG. 5 shows an example of a system diagram of an abrasive transported fluid to which the technology of the present invention is applied. 1... Plastic non-ferrous main pipe, 3... Wear-resistant material, 4...
...Separate mold, 5, 6... Blind plate, 7... On/off and pressure regulating valve, 8... Pressurized medium introduction pipe.

Claims (1)

[Claims] 1. In a method of manufacturing a bent pipe section of a transport pipe for transporting powder, small pieces of wear-resistant material are glued to the inner surface of a bent pipe made of plastic non-ferrous metal without any gaps between them, and the ends of the bent pipe are Attach a blind plate and attach a mold to the outside as necessary, then introduce pressurized medium into the bent pipe through the introduction pipe and pressure regulating valve provided on one side of the blind plate, and gradually apply pressure to the entire inner surface evenly. A method for manufacturing a wear-resistant bent pipe, which is characterized by adding the above and crimping a wear-resistant material.