JPS6141709B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is applicable to pipes such as cylindrical or rectangular steel pipes.
The present invention relates to a method for simultaneously cleaning the inner and outer surfaces of a pipe and an apparatus therefor.

Conventionally, to remove scale from pipes such as cylindrical or rectangular steel pipes, pickling or using a centrifugal projection device was used to spray abrasive materials such as shots onto the inside and outside of the pipe.
Either they were blasted and polished separately by a device dedicated to the exterior surfaces. However, in the former case, handling is dangerous, productivity is low, and waste liquid disposal is difficult, and in the latter case, separate projection devices for internal and external cleaning are required, and Therefore, there were various problems such as low productivity and the need to take up a large space to install the equipment. The present invention has been made in order to solve these problems, and the present invention supports the pipe to be polished within the cleaning tube with substantially the same gap on the entire outer circumferential surface, and the pipe is polished with compressed air inside the cleaning tube. It is an object of the present invention to provide a method for simultaneously cleaning the inner and outer surfaces of a pipe, and an apparatus for simultaneously cleaning the inner and outer surfaces of the pipe by passing a cleaning material through the pipe. The configuration of the present invention will be explained below based on examples.

1 is a track laid on foundation A 2 wheels 3 on the top surface
This is a trolley installed so that it can freely run left and right via the support member 4.
is supported horizontally. The injection nozzle 5 is provided with a supply port 6 for supplying abrasive material near the center, and a bypass connection port 7 is provided at a position slightly away from the supply port 6.The supply port 6 is provided with an adjustment valve. A storage tank 10 for the abrasive material 9 is connected via the
In addition, bypass pipes 11 each having one end connected to the upper space of the storage tank 10 are connected to the bypass connection port 7 in order to equalize the internal pressures of the injection nozzle 5 and the storage tank 10 and prevent uneven flow rates. Further, an on-off valve 12 and a pipe 1 are provided at one end of the injection nozzle 5.
A compressed air source (not shown) is connected via 3. In this way, the abrasive material 9 is used together with compressed air.
A pre-dust device 15 is installed at a position opposite to the injection nozzle 5 of the mixing device 14, which is provided to inject . In addition, 16
is a lid member for sealingly closing the input port for the abrasive material 9.

The pre-dust device 15 includes an abrasive material collection hopper 19 having an inlet pipe 17 projecting from the side wall opposite to the injection nozzle 5 and an exhaust hole 18 in the upper part, and an abrasive material and compressed material inside the hopper 19. The main part is composed of a shielding plate 20 installed to separate air from the air. The pre-dust device 15 configured in this way is equipped with a trolley 2 that is movable on the upper surface of a pavement 21 laid on the foundation A via wheels 22.
3 via a support member 24. Note that 25 is an opening/closing gate provided at the discharge port of the collection hopper 19.

Reference numeral 26 denotes a polishing pipe installed so as to be able to enter and exit between the injection nozzle 5 of the mixing device 14 and the inlet pipe 17 of the pre-dust device 15, which is installed facing the mixing device 14 with an appropriate interval. Inside the cleaning tube 26, a pipe to be polished 27 is supported via a support member 28 with a substantially uniform gap being maintained at the outer circumferential portion. Further, the pipe to be polished 27 is
It is horizontally supported via a support member 32 by a trolley 31 which is movable in a direction orthogonal to the direction of movement of the vehicle and is movable on a track 29 via wheels 30 . In addition, 33 is the pipe to be polished 27
A semicircular baffle plate is provided on the rear end surface of the inlet pipe 17 of the pre-dusting device 15, and is used to prevent the abrasive material passing along with the compressed air passing through the inner peripheral surface of the pipe 27 to be polished. The internal resistance of the abrasive material passing between the inner surface of the sweep pipe 26 and the outer surface of the pipe to be polished 27 is kept constant to prevent uneven cleaning of the inner and outer surfaces of the pipe to be polished 27. This is provided to prevent uneven cleaning from occurring on the inner and outer surfaces of the pipe 27.

Next, the operation of the device configured as described above will be explained.

The pipe to be polished 27 is placed inside the cleaning pipe 26 and the supporting member 2
The abrasive tube 26 is supported via the injection nozzle 5 of the mixing device 14 and the inlet tube 17 of the pre-dusting device 15.
1, the carriages 1 and 23 are moved toward each other to sharpen the injection nozzle 5 of the mixing device 14 and the inlet pipe 17 of the pre-dust device 15, respectively. When connected to the opening of the sweep pipe 26 and then opening the on-off valve 12 to supply compressed air into the injection nozzle 5, the compressed air flows from the storage tank 10 through the adjustment valve 8 and the supply port 6 into the injection nozzle 5. Continuously supplied abrasive material 9
The compressed air is also injected and supplied into the polishing pipe 26 from the bypass pipe 11 to the storage tank 10.
The internal pressures of the storage tank 10 and the injection nozzle 5 are maintained at the same pressure, so that the abrasive material 9 in the storage tank 10 is uniformly supplied into the injection nozzle 5. Ru.

The abrasive material injected into the cleaning tube 26 together with the compressed air passes through the cleaning tube 26 at a uniform speed while contacting the inner and outer peripheral surfaces of the pipe 27 to be polished. The inner and outer circumferential surfaces of the cleaning pipe 27 are polished uniformly and evenly. After that, the abrasive material passes through the inlet pipe 17 and collides with the shielding plate 20 in the hopper 19, and the compressed air is separated and falls downward into the hopper 19.
9 is accumulated and collected at the bottom, while compressed air is collected through the exhaust hole 1.
8 to the outside. After that, mixer 1
The injection nozzle 5 of No. 4 and the inlet pipe 17 of the pre-dust device 15 are moved in a direction away from each other to be separated from the cleaning tube 26, and the cleaning tube 26 is moved in a direction orthogonal thereto to separate the injection nozzle 5 and the inlet tube. Exit to the side from between 17. Subsequently, the engagement between the pipe to be polished 27 and the support member 28 is released, and the pipe to be polished 27 is taken out to the outside of the cleaning pipe 26. and,
A new pipe 27 to be polished is again supported by the support member 28 in the cleaning tube 26, and the above-described operations are repeated to perform the cleaning work on the inner and outer surfaces of the pipe 27 to be polished.

In short, the present invention uses a method in which a pipe to be polished is supported in a polishing tube with substantially the same gap on the entire outer peripheral surface, and an abrasive material is supplied and passed through the cleaning tube together with compressed air. The injection nozzle of the mixing device, which is capable of injecting the scavenging material together with compressed air from the injection nozzle, and the inlet pipe of the pre-duster device are opposed to each other with an appropriate interval, and the mixing device and the pre-duster device are reciprocated in the mutual direction. The cleaning tube is movably provided between the injection nozzle and the inlet tube and has a support member therein for supporting the pipe to be polished, so that it can be taken in and out. Inside/
It is possible to simultaneously polish the outside surface, dramatically improving productivity, ensuring work safety, and even requiring only a small space to install the device, which provides various benefits. It is.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an embodiment of the present invention, Fig. 2
The figure is a detailed view of part A. 5... Injection nozzle, 9... Abrasive material, 14... Mixing device, 15... Pre-duster device, 17... Inlet pipe, 26... Grinding tube, 27... Pipe to be polished, 2
8...Supporting member.

Claims (1)

[Claims] 1. A semicircular baffle plate is attached to the rear end surface of the pipe to be polished, and the pipe to be polished with the baffle plate attached is supported in the cleaning pipe with the entire outer circumferential surface having substantially the same gap. A method for simultaneously cleaning the inner and outer surfaces of a pipe, characterized by supplying and passing an abrasive material into the pipe together with compressed air.