JP2988310B2 - Thread surface treatment equipment for steel pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to equipment to facilities the chemical surface treatment to the threaded portion of the steel pipe.

[0002]

2. Description of the Related Art Conventionally, a chemical conversion treatment (mainly zinc phosphate treatment) has been applied to the surface of a screw in order to prevent the surface of the screw from galling when connecting a steel pipe. As a method of performing a chemical conversion treatment on the steel pipe thread portion, a method of immersing a pipe end thread portion of a steel pipe inclined at an appropriate angle in a treatment liquid in a treatment tank, and a method of spraying a treatment liquid on the pipe end thread portion of a steel pipe There is.

By the way, this method has an advantage that a high-quality steel pipe can be treated because a film having a uniform thickness can be obtained in the circumferential direction of the thread portion, but an apparatus for inclining the steel pipe is required. There is a problem that the equipment is complicated and large. In addition, the method has an advantage that a large processing facility is not required and the processing efficiency is excellent. However, it is difficult to obtain a film having a uniform thickness in the circumferential direction of the screw portion, and there is a problem that the quality is not stable.

Therefore, a method and an apparatus for applying a coating treatment to a pipe end thread portion in order to solve the problems caused by the above-mentioned method have been proposed in Japanese Patent Application Laid-Open No. 63-65978.

[0005]

However, in this method and apparatus, since the apparatus for performing the degreasing step, the rinsing step, and the film processing step is switched by operating the cylinder device to perform each step, the switching time for each step is changed. is necessary. Further, since the configuration is such that steel pipes are processed by a predetermined number of pieces, when processing a steel pipe having a large outer diameter, for example, a steel pipe having an outer diameter of 200 mm or more, it is necessary to increase the size of the equipment. Further, since the number of steel pipes that can be processed at one time is limited, a space for accommodating the steel pipes to be processed is required.

The present invention has been made in view of the above-mentioned problems, and provides a threaded surface treatment apparatus for a steel pipe capable of efficiently treating a surface of a steel pipe having excellent quality without increasing the size of the equipment. It is intended to be.

[0007]

To achieve the above object SUMMARY OF THE INVENTION The apparatus of the present invention is an apparatus for performing chemical conversion treatment on the threaded portion of the steel pipe end, it skids and the upper surface of this skid Forming more protruding projections at predetermined intervals, comprising a steel pipe transfer device provided with a chain driven at a predetermined speed, a degreasing cleaning nozzle for supplying a degreasing cleaning liquid, and a washing nozzle for supplying water, A chemical conversion nozzle for supplying a chemical conversion solution is disposed above the steel pipe transfer device, and a curtain is defined between the nozzles so as not to mix the degreasing cleaning solution, the chemical conversion solution, and the water supplied from each nozzle. It was interposed.

[0008]

According to equipment of the present invention, the steps of degreasing by degreasing solution, a step of washing the threaded portion which is degreasing, a step of chemical conversion treatment by supplying a process liquid into a threaded portion which is washed with water Since the steps of washing the chemically threaded portion with water are successively applied to the threaded portion of the steel pipe which is conveyed while rotating, a uniform coating can be formed in the threaded portion of the steel tube in the circumferential direction. Further, since the threaded portion of the steel pipe is processed independently in each processing step, the processing efficiency is improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram showing a configuration of the device of the present invention,
FIG. 2 is a view showing a configuration of a steel pipe transfer device which is a component of the device of the present invention.

[0010] In the drawings, 1 denotes a steel pipe transfer apparatus for transferring while rotating the steel pipe P which has been processed the screw to the tube end received from the kicker 21, abuts against the steel pipe P protrudes from the upper surface of the skid 2 projections 3a by the chain 3 is the driving source for example, a motor 4 provided at a predetermined interval for example 500mm and rotated at a predetermined speed, moves on the skid 2 steel pipe P is sequentially to exist a predetermined speed and a predetermined distance It is configured to be.

[0011] Above the steel pipe transfer device 1, a degreasing cleaning nozzle 5 for spraying a degreasing cleaning liquid to the threaded portion of the steel pipe P to perform a series of chemical treatments on the transferred steel pipe P, Rinsing nozzle 6 for injecting water into the nozzle, chemical conversion nozzle 7 for supplying a chemical conversion liquid to the washed screw portion to form a film, and water and hot water for washing away the chemical conversion solution excessively remaining in the screw portion. A second washing nozzle 8 and a hot water washing nozzle 9 for jetting water are sequentially arranged from the upstream side. For example, a rubber curtain 10 is provided between the nozzles 5 to 9 at intervals according to the processing time. The liquid supplied to the thread portion of the steel pipe P is prevented from mixing.

A laminar nozzle is used as the chemical conversion nozzle 7 in order to prevent unevenness of the film formed on the surface of the threaded portion of the steel pipe P, and each of the nozzles 5 to 9 is provided according to each processing time. The width of the booth is changing.

Also, for example, processing liquid receiving tanks 11 to 15 made of stainless steel for storing the liquids supplied from the respective nozzles 5 to 9.
Are disposed below the steel pipe transfer device 1 at positions corresponding to the respective nozzles 5 to 9, and the liquids stored in the respective processing liquid receiving tanks 11 to 15 are stored in respective tanks via the respective pipes 16 to 20. Sent to.

[0014] The present invention apparatus, there in configuration described above, processed steel pipe P with screws to the tube end is sent to the steel pipe transfer device 1 by kicker 21, while moving on the steel pipe transfer device 1 A chemical conversion treatment is applied to the screw surface.

At this time, the steel pipe P transferred by the steel pipe transfer device 1 is sprayed with the degreasing cleaning liquid from the degreasing cleaning nozzle 5 to clean and remove the oil and dust on the screw portion surface, and then the steel pipe P is transferred from the first water cleaning nozzle 6. The degreased cleaning liquid remaining on the screw portion is washed away by the injected water. And the chemical conversion nozzle 7
The chemical conversion treatment liquid is supplied from the chemical conversion treatment nozzle at a position below the nozzle, and a film is formed on the thread portion of the steel pipe. At a position below the second washing nozzle 8 and the hot water washing nozzle 9, the second washing nozzle 8,
The water and hot water sprayed from the hot water washing nozzle 9 wash away the chemical conversion treatment liquid that has excessively adhered to the screw surface. And
Steel pipe P whose surface has been subjected to chemical conversion treatment as described above
Is sent out by the kicker 22 from the steel pipe transfer device 1 to the accumulation site.

Outer diameter φ9.625 inch (about 244mm)
The chemical conversion treatment (zinc phosphate treatment) was carried out at the respective treatment times shown in Table 1 by the method using the apparatus of the present invention and the conventional method (the method proposed in Japanese Patent Application Laid-Open No. 63-69778) on the thread portion of the steel pipe. Compare the case of applying.

[0017]

[Table 1]

In the case of the method using the apparatus of the present invention, the protrusion 3a
With steel pipes at intervals of 500 mm.
If a device that conveys at a speed of 0 mm / min is configured, the device will be 6000 mm wide including a standby space of 500 mm.
The processing capacity is 60 lines / hour. In contrast, 60
In the case of the conventional method using an apparatus having a width of 00 mm, a standby space (300 mm) equivalent to the processing space (3000 mm) is used.
0mm) is required, so 10 pipes can be processed at one time.
It requires 1 hour for loading and unloading steel pipes (2 minutes) and switching time for each process (2 minutes).
In 5 minutes, the processing capacity is 40 tubes / hour.

When an apparatus of the same size is used as described above, the method using the apparatus of the present invention has 1.5 times the processing capacity as compared with the conventional method, and In this case, one steel pipe is stored in the standby space until the process is completed.
If the number is less than 0, there is a problem that the processing capacity is reduced. In addition, according to the method using the apparatus of the present invention, the configuration of the apparatus can be simplified because a rotation driving apparatus for rotating the steel pipe and a switching apparatus for switching each process are not required.

[0020]

As described in the foregoing, according to the equipment of the present invention, the screw portion of the steel pipe to be transported while rotating,
A step of degreasing and cleaning with a degreasing cleaning liquid, a step of rinsing the degreased and cleaned thread portion, a step of supplying a treatment liquid to the thread portion and the step of rinsing the chemically threaded portion. Since the coating is performed sequentially and sequentially, a uniform coating can be formed in the circumferential direction on the threaded portion of the steel pipe. Further, the processing efficiency is improved.

[Brief description of the drawings]

1 is a diagram showing the configuration of the onset AkiraSo location.

FIG. 2 is a diagram showing a configuration of a steel pipe transfer device that is a component of the device of the present invention.

[Explanation of symbols]

1 steel tube transfer device 2 skid 3 chain 3a projections 5 degreasing nozzle 6 first washing nozzle 7 chemical treatment nozzle 8 second washing nozzle 9 hot water nozzle 10 Curtain P steel

Claims (1)

(57) [Claims] 1. A device for performing chemical conversion treatment on the threaded portion of the steel pipe end, a skid, a projection projecting from the upper surface of this skid is formed at a predetermined interval, at a predetermined speed A steel pipe transfer device provided with a driven chain is provided, and a degreasing cleaning nozzle for supplying a degreasing cleaning liquid, a washing nozzle for supplying water, and a chemical conversion nozzle for supplying a chemical conversion treatment liquid are provided above the steel pipe transfer device. A surface treatment device for a threaded portion of a steel pipe, wherein a curtain is provided between each of the nozzles so as to prevent mixing of a degreasing cleaning solution, a chemical conversion treatment solution, and water supplied from each nozzle.