JPH07266231A - Pipe inner surface cleaning device - Google Patents

Abstract

PURPOSE:To provide a pipe inner surface cleaning device which is installed within the same line as an outer-surface shot blast facility and which needs no facility for returning recovered polisher to the outer surface shot blast facility for reuse. CONSTITUTION:This device, installed on the same conveyor line as an outer- surface shot-blast facility 2, is for removing polisher and scales by blowing compressed air to the inner surface of a pipe P after the outer surface of the pipe is shot blasted. An injection nozzle 9 which, while moving along the conveyor line in synchronization with the speed of travel of the pipe P, forces compressed air fed from a compressed air supply mechanism to be blown to the pipe inner surface from the end of the pipe P with an end of the pipe P located outside the hood 2a of the outer surface shot blast facility 2 and with the rear end of the pipe P located inside the hood 2a, and a device 10 for moving the injection nozzle 9 in synchronization, are arranged parallel to the conveyor line. The device is fitted with a retreat mechanism 11 for retreating the injection nozzle 9 just before the rear end of the pipe P protrudes onto the synchronization moving device 10 from the hood 2a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cleaning the inner surface of a tube after shot blasting the outer surface of the tube.

[0002]

2. Description of the Related Art A shot blasting method is often used as a mechanical descaling method, and this shot blasting method is also used for descaling the inner and outer surfaces of a pipe. Usually, descaling of the pipe is performed without closing the end face of the pipe with a lid, so that when the outer surface of the pipe is shot blasted, the abrasive material remains in the pipe after shot blasting. Since the polishing and cleaning material for the outer surface blast and the polishing and cleaning material for the inner surface blast have different shapes, the inner surface shot blasting cannot be performed in the next step with the polishing and cleaning material remaining in the pipe as described above. Therefore, it is necessary to clean the outer surface to remove the abrasive remaining in the tube after shot blasting.

The removal and cleaning work of the polishing and cleaning material remaining in the pipe after the outer surface shot blasting is conventionally performed by a pipe fixing device and a pipe fixed by the fixing device between the outer surface shot blasting equipment and the inner surface shot blasting equipment. The equipment including the air injection device installed on one pipe end side and the dust collecting device also installed on the other pipe end side is separately installed. In addition to this, there is also one in which an air injection nozzle is inserted into the pipe while rotating the pipe (actual flat 60
-100083).

[0004]

However, since the above-mentioned conventional pipe inner surface cleaning devices are all installed on separate lines, a wide equipment space is required and there is a problem in work efficiency. In addition, equipment for returning the collected cleaning and cleaning material to the external shot blasting equipment is required separately.

The present invention has been made in view of the problems of the above-described conventional pipe inner surface cleaning device,
It is an object of the present invention to provide a pipe inner surface cleaning device which does not require a device installed in the same line and returned to the outer surface shot blasting device for reuse of the collected cleaning material.

[0006]

In order to achieve the above object, a pipe inner surface cleaning apparatus of the present invention is installed on the same conveying line as an outer surface shot blasting equipment, and compressed air is applied to the inner surface of the pipe after the outer surface shot blasting. Is a device that removes abrasives and scales by spraying with a pipe, and the pipe tip is located outside the hood of the external shot blasting equipment and the pipe rear end is located inside the hood. The injection nozzle that blows the compressed air sent from the compressed air supply mechanism onto the inner surface of the pipe from the tip side of the pipe while moving along the transfer line, and the synchronized movement device of this injection nozzle and the arrangement on this synchronized movement device. A retracting mechanism is provided which retracts the injection nozzle immediately before the rear end of the pipe comes out of the hood.

[0007]

The pipe inner surface cleaning apparatus of the present invention operates the compressed air supply mechanism to operate the compressed air supply mechanism to operate the pipe from the injection nozzle while the pipe tip is located outside the hood of the exterior shot blasting equipment and the pipe rear end is located inside the hood. While blowing compressed air from the tip side toward the inner surface of the pipe, drive the tuning movement device to move along the transfer line in synchronization with the pipe, and remove the abrasive and scale remaining on the inner surface of the pipe after shot blasting the outer surface. Remove. Then, the operation of the compressed air supply mechanism is stopped immediately before the rear end of the pipe comes out of the hood, and then the retracting mechanism is operated to retract the injection nozzle.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pipe inner surface cleaning apparatus of the present invention will be described below based on one embodiment shown in FIGS. FIG. 1 is an overall plan view of a pipe inner surface cleaning device of the present invention, FIG. 2 is a side view of an injection nozzle that constitutes the pipe inner surface cleaning device of the present invention, a synchronous movement device for this injection nozzle, and a retracting mechanism, and FIG. It is explanatory drawing of the schematic structure of the outer surface shot blast equipment which applies the pipe inner surface cleaning apparatus of invention.

In the drawings, reference numeral 1 is a pipe inner surface cleaning apparatus of the present invention, which is installed on the same conveying line immediately after the outer surface shot blasting equipment 2 and has a structure as described below.

Numeral 3 is arranged at a predetermined angle in the conveying direction of the pipe P, and the output shaft of the motor 4 is rotated by the sprocket 5.
A large number of conveyor rollers that are transmitted to the power transmission shaft 7 via the chain 6 and are synchronously rotated from the power transmission shaft 7 via the gear train 8. The conveyor rollers are formed in a drum shape. Therefore, the pipe P
Is conveyed while being spirally rotated by these many conveyor rollers 3.

The outer surface 9 is shot-blasted by the outer surface shot blasting equipment 2 while being conveyed while being spirally rotated by the plurality of conveyor rollers 3, and the pipe tip comes out from the hood 2a of the outer surface shot blasting equipment 2. , A jet nozzle that blows compressed air from the compressed air supply mechanism to the inner surface of the pipe through an air hose toward the inner surface of the pipe, and when the compressed air is blown to the inner surface of the pipe, the injection port faces the inner surface of the pipe. Is located.

From the standpoint of improving work efficiency, the pipe inner surface cleaning device 1 of the present invention is performed at the same time as the outer surface shot blasting, so that the injection nozzle 9 is synchronized with the transfer speed of the pipe P in synchronization with the transfer speed of the transfer line. Need to move along. Therefore, in the present invention, the synchronous moving device 10 for the injection nozzle 9 is installed along the transfer line immediately after the outer surface shot blasting equipment 2.

In this synchronizing movement device 10, for example, a rail 10a is arranged in parallel to one side of the transfer line, and a carriage 10b on which the injection nozzle 9 is mounted is moved along the rail 10a. Is. In this embodiment, as this moving means, a rack 10c is laid parallel to the rail 10a, and a pinion 10e attached to the output shaft of a reduction gear motor 10d installed on the carriage 10b is meshed with the rack 10c. It discloses things. The moving means is not limited to the one having the above-described configuration, and any configuration may be used as long as it can move in synchronization with the transport speed of the pipe P, such as a motor that directly rotates the wheels 10ba of the carriage 10b in the forward and reverse directions.

Reference numeral 11 is a retracting mechanism installed on the carriage 10b, and the injection nozzle 9 is provided with a pipe P immediately before the rear end of the pipe P shot-blasted on its outer surface by the outer surface shot blasting equipment 2 comes out of the hood 2a. In order not to collide with the tip of the, the upper end is swung upward and retracted. In this embodiment, as the retracting mechanism 11, the base end of the lever 9a having the injection nozzle 9 attached to the tip thereof is rotatably attached integrally to a pivot 11c that is rotatably supported on the carriage 10b. The other end is the pivot 1
Link plate 1 rotatably attached to 1c
It is disclosed that the rod end of an air cylinder 11a pivotally supported by a carriage 10b is pivotally attached to one end of 1b.

That is, in this embodiment, the air cylinder 1
When the rod 1a moves back and forth, the link plate 11
b, the pivot 11c, and the lever 9a are rotated counterclockwise in FIG. 2 by a predetermined angle, and the injection nozzle 9 attached to the tip of the lever 9a is swung upward. The retracting mechanism 11 of the jet nozzle 9 is not limited to the one disclosed in the present embodiment, and may be slid horizontally if it does not interfere with the conveyor roller 3 or the like and does not collide with the pipe P. May be.

The pipe inner surface cleaning device 1 of the present invention is constructed as described above. Next, a method for cleaning and removing the inner surface of the pipe P whose outer surface is shot blasted by using the pipe inner surface cleaning device 1 of the present invention will be described. To do.

First, while being spirally conveyed by the conveyor roller 3, it is carried into the outer surface shot blasting equipment 2,
Position detection installed at a predetermined position that the tip of the pipe P whose outer surface has been shot blasted is located outside the hood 2a of the outer surface shot blasting equipment 2 and the rear end of the pipe P is located inside the hood 2a Where it was detected by the vessel
The compressed air supply mechanism is operated to blow compressed air from the tip end side of the pipe P toward the inner surface of the pipe P from the injection nozzle 9 which is positioned at the injection position in advance.

Simultaneously with the blowing of the compressed air, the motor 10d of the tuning and moving device 10 is driven to move the injection nozzle 9 in synchronization with the pipe P and move along the conveying line to blow the compressed air onto the inner surface of the pipe P. After the outer surface shot blasting, the polishing material and scale remaining on the inner surface of the pipe P are removed. The operation of the compressed air supply mechanism is stopped immediately before the rear end of the pipe P exits from the hood 2a, and then the air cylinder 1 of the retracting mechanism 11 is stopped.
The rod 1a is moved back and forth to swing the jet nozzle 9 upward and retract it.

At the position immediately before the rear end of the pipe P comes out of the hood 2a, that is, at the position where the supply of compressed air is stopped and the injection nozzle 9 is retracted, for example, the length of the pipe P and the conveying speed of the pipe P are previously synchronized. Input to the controller of the mobile device 10,
An appropriate method may be used, such as obtaining the compressed air from the injection nozzle 9 to the inner surface of the pipe P by detecting the tip of the pipe P based on the input length and the transport speed.

In the pipe inner surface cleaning device 1 of the present invention,
Since the inner surface of the pipe P is cleaned and removed in parallel with the shot blasting in the outer surface shot blasting equipment 2, the polishing agent and scale remaining on the inner surface of the pipe P due to the blowing of the compressed air from the injection nozzle 9 is the outer surface shot blasting equipment. It will be blown out into 2. Therefore, when the pipe inner surface cleaning device 1 of the present invention is applied, as shown in FIG. 3, for example, a screw conveyor 2b is installed below the conveyor roller 3 in the outer surface shot blasting equipment 2 and the blown-off cleaning is performed. If the material and scale are recovered, the abrasive and cleaning material are separated from the scale, and then only the abrasive and cleaning material is reused, it is not necessary to newly install a recovery equipment unlike the conventional apparatus. In FIG. 3, 2c indicates a dust collecting duct, and 2d indicates a rotor for injecting the abrasive.

[0021]

As described above, in the pipe inner surface cleaning device of the present invention, the compressed air is blown to the inner surface of the pipe while rotating the pipe in a spiral shape. The removal efficiency of is also improved. Moreover, since it is performed in parallel with the external shot blasting, there is no need for a pipe rotating facility or a collecting facility in a separate line, the installation space for the facility can be narrowed, and the layout can be simplified. Further, since the polishing and cleaning material and scale remaining on the inner surface of the pipe are blown out into the shot blasting equipment on the outer surface, the polishing and cleaning material and dust collecting equipment such as scale can also be used.

[Brief description of drawings]

FIG. 1 is an overall plan view of a pipe inner surface cleaning device of the present invention.

FIG. 2 is a side view of an injection nozzle, a synchronism moving device for the injection nozzle, and a retracting mechanism that constitute the pipe inner surface cleaning device of the present invention.

FIG. 3 is an explanatory view of a schematic structure of an outer surface shot blasting equipment to which the pipe inner surface cleaning device of the present invention is applied.

[Explanation of Codes] 1 pipe inner surface cleaning device 2 outer surface shot blasting equipment 2a hood 9 injection nozzle 10 tuning moving device 11 retracting mechanism P pipe

Claims (1)

[Claims] 1. An apparatus for removing abrasives and scales by blowing compressed air to the inner surface of a pipe after the outer surface shot blasting, which is installed on the same conveying line as the outer surface surface shot blasting equipment, and the pipe tip is an outer surface shot. While moving outside the hood of the blast equipment and with the rear end of the pipe inside the hood, while moving along the transfer line in synchronization with the transfer speed of the pipe,
An injection nozzle for blowing the compressed air sent from the compressed air supply mechanism from the pipe tip side to the inner surface of the pipe, a synchronous movement device for the injection nozzle, and a synchronous movement device arranged on the synchronization movement device, and the rear end of the pipe from the hood. A pipe inner surface cleaning device comprising a retracting mechanism for retracting the injection nozzle immediately before the ejection.