JPS6336302B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lubricant application device for a threaded portion on the inner surface of a tube, which evenly applies a lubricant such as grease to a threaded portion on the inner surface of a pipe joint connected to a pipe end, for example.

For example, when shipping oil country tubular goods from a pipe manufacturing factory, threads must be cut on the outer surfaces of both pipe ends and a pipe joint must be screwed onto one pipe end. In order to ensure this screwing and to ensure smooth connection of OCTGs at construction sites, apply lubricant made from a specified standard grease evenly to the threaded portions on the outer surface of the pipe ends and the threaded portions on the inner surface of the pipe fitting. It is necessary to apply the plug without any defects, and to screw the plug into the internal thread of the pipe joint.

Generally, this lubricant application step is often performed manually, but as a method of applying lubricant by mechanical means, a method is known in which a nozzle is rotated at high speed and sprayed using centrifugal force. However, since this conventional device requires high-speed rotation, the seal portion is likely to be damaged, and maintenance work is labor-intensive.

SUMMARY OF THE INVENTION An object of the present invention is to provide a lubricant application device for a threaded part on the inner surface of a tube, which eliminates the above-mentioned drawbacks and uses a nozzle to apply lubricant automatically and evenly in concentration to the threaded part on the inner surface of the pipe end. The gist thereof is to provide a nozzle mechanism that enters a tube end and sprays lubricant onto a threaded portion in the tube end, and a mechanism for moving the nozzle mechanism back and forth in the axial direction relative to the tube end. a cover that surrounds the tube end when the nozzle mechanism is inserted into the tube end; the nozzle mechanism includes a fixed support tube having a lubricant supply hole and a gas supply hole; It consists of a rotating cylinder rotatably supported around a fixed support cylinder, and a nozzle head attached to the front of the rotating cylinder, and the nozzle head includes an inner pipe having a center hole communicating with the lubricant supply hole, and the inner pipe. and a plurality of lubricant outlets that penetrate the inner tube and the outer tube in a radial direction and communicate with the center hole of the inner tube. This is characterized by comprising a short pipe, and an outlet member forming a gas outlet passage communicating with the annular space around the short pipe.

The present invention will be explained in detail based on illustrated embodiments.

FIG. 1 shows an embodiment of an apparatus for applying a lubricant such as grease to the internal thread of a pipe joint C screwed onto the end of an oil country tubular goods P. This device includes a fixed rail 1, a movable base 2 mounted on the rail 1 so as to move back and forth, a cylinder mechanism 3 for reciprocating the movable base 2 along the rail 1, and a movable base 2 on the movable base 2. It is composed of an attached drive mechanism 4 and a nozzle mechanism 5 that is rotationally driven by the drive mechanism 4.

A base 20 of the movable table 2 is supported by rollers 21 and 22 so as to reciprocate on the rail 1. A drive mechanism 4 is installed on the base 20,
A frame 23 fixed to a base 20 has a nozzle mechanism 5, a cover 24 surrounding the nozzle mechanism 5, and an oil reservoir 25 attached to the cover 24 for receiving grease.
is provided. Furthermore, limit switch operating cams 26 and 27 are attached to the base 20.

In the cylinder mechanism 3, for example, a hydraulic cylinder 30 is fixed by a support member 31, its piston 32 is connected to the base 20 of the movable base 2, and the limit switches 10, 11, 12 on the rail 1 and the operating cam of the movable base 2 are connected. A predetermined reciprocating position of the movable base 2 is determined by 26 and 27.

In the drive mechanism 4, a motor 40 and a reduction gear 41 are attached to a base 20, a sprocket 43 is fixed to an output shaft 42, and a sprocket 50 of the nozzle mechanism 5 is driven via a toothed belt or chain 44. It's getting old.

A support cylinder 51 of the nozzle mechanism 5 is fixed to the frame 23 of the movable base 2, and a grease supply hole 52 at a central position and a gas supply hole 53 for supplying air, for example, at an intermediate position are bored in this support cylinder 51. It is connected to a grease supply device and a compressed gas supply device through conduits (not shown). A rotary cylinder 5 is installed around the fixed support cylinder 51 via a bearing 54.
5 is supported, and the sprocket 5 is supported on this rotating cylinder 55.
0 is integrated. A nozzle head 56 is replaceably attached to the front end of the rotating cylinder 55.
This nozzle head 56 has a structure in which an inner tube 57 and an outer tube 58 are fitted together, and a center hole 59 in the inner tube 57 is communicated with the grease supply hole 52 of the support cylinder 51. Further, an annular space 60 between the inner tube 57 and the outer tube 58 is communicated with the gas supply hole 53 of the support tube 51.

The details of the cross section of the tip of the nozzle head 56 are as shown in FIG. 2, and a cross-shaped hole is made in the inner tube 57, into which a short tube 61 is inserted, from which grease is spouted in all directions. An outlet member 63 having a gas outlet 62 of a predetermined diameter is attached around the tip of the short tube 61, and a required gas outlet path is formed between the outer surface of the short tube 61 and the inner surface of the outlet member 63. ing. Furthermore, the tip of the center hole 59 is connected to a plug 64.
Closed by.

Next, to explain the operation of this device, first, the hydraulic cylinder 30 is set to the retracted position, and a transfer mechanism (not shown) is used to move the tip of the pipe fitting C screwed onto the threaded pipe P so that it almost coincides with the pipe end reference plane L. Transport. The movable base 2 is advanced by the cylinder mechanism 3, and the nozzle head 56 is inserted into the pipe joint C. The movement of the movable base 2 is controlled by the limit switch 1.
This is done under the control of 0 and 11. Next, the motor 40 is started, and its driving force is transmitted to the reduction gear device 41, output shaft 42, sprocket 43, chain 44, sprocket 50, and rotating cylinder 55.
For example, a nozzle head 56 integrally connected to
Rotate at 150-200 rpm.

Supplying grease of a predetermined standard from a grease supply device (not shown) to the grease supply hole 52 of the support cylinder 51 at a substantially constant pressure, for example, 30 kg/cm ² ,
Through the center hole 59 of the nozzle head 56, the short pipe 61
Grease G is blown out from the tip as shown in FIG. At the same time, when compressed gas at a predetermined pressure, for example 2 to 4 kg/cm ^{2 ,} is supplied from a compressed gas supply device (not shown) to the gas supply hole 53 of the support tube 51, this compressed gas flows between the inner tube 57 and the outer tube 58. The grease G passes through the annular space 60, passes through the outer surface of the short pipe 61, and is blown out from the gas outlet 62 as a gas flow A surrounding the grease G. The compressed gas blown out spreads outward due to a pressure drop, and in conjunction with this, the grease G is blown out at a certain angle. Therefore, by selecting the gas pressure value, the spread angle of the grease G from the short pipe 61 can be set to a desired value.

When the cylinder mechanism 3 is operated to move the movable table 2 back and forth by a predetermined distance, the nozzle head 56 will blow out the grease G from the short pipe 61 at the required angle while rotating, so that the short pipe 61 will be inserted into the pipe joint C. During this time, grease G can be sprayed evenly onto the threaded portion of the inner surface of the pipe fitting C. Short pipe 61 is pipe joint C
If you go outside, the blown out grease G will be on the cover 24.
The oil adheres to the inner surface of the oil tank and flows down into the oil sump 25 where it is recovered and reused.

The compressed gas flow A determines the spread of the grease G, but also plays a role in preventing clogging of the grease. That is, by blowing out compressed gas for some time even after the grease spraying has stopped,
The grease remaining in the short pipe 61 is sucked and blown away to prevent the grease from dripping. Since the nozzle head 56 is replaceable with respect to the rotary cylinder 55,
It is possible to change the fitting as appropriate depending on the size of the pipe joint C, and to deal with grease clogging by cleaning or the like.

In the above-mentioned embodiment, the nozzle head 56 is rotatable, but this rotation can be made relative to the pipe fitting C, and the threaded pipe P to which the pipe fitting C is screwed can be rotated without rotating the nozzle head 56. It may be rotated. Also, the nozzle head 5
The same applies to the forward and backward movement of the movable base 2 of No. 6, and the threaded pipe P may be moved forward and backward. Furthermore, the grease is applied by the nozzle mechanism 5.
Although this was done using a chisel, it is also possible to use a brush in order to spread the grease more evenly. In this case, one or several rotating brushes may be arranged in parallel on the nozzle head 56. In addition, if the pipe has a small diameter and the brush cannot be installed in parallel with the nozzle head 56, the brush can be attached to the tip of the nozzle head 56 coaxially with the nozzle head 56.
It is also possible to level out the grease when returning in step 6. The internal thread cut portion is not necessarily limited to pipe joints, but can also be applied to cases in which the inner surface of the pipe is directly threaded.

As explained above, the apparatus for applying lubricant to the internal threads of a pipe according to the present invention can spray lubricant evenly and without defects to the internal threads of a pipe fitting, etc. connected to a pipe end. Compared to conventional equipment, the efficiency is extremely high, and there are fewer breakdowns compared to conventional equipment, resulting in a significant improvement in work.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of a lubricant application device for a threaded portion on the inner surface of a pipe according to the present invention, and FIG. FIG. 2 is a partially enlarged sectional view of the nozzle mechanism, and FIG. 3 is an explanatory diagram of a state in which grease and gas are blown out from the nozzle mechanism. 1 is a rail, 2 is a movable base, 3 is a cylinder mechanism, 4 is a drive mechanism, 5 is a nozzle mechanism, 40 is a motor, 51 is a support cylinder, 52 and 59 are grease supply holes, 53 is a gas supply hole, and 55 is a A rotary cylinder, 56 is a nozzle head, 57 is an inner pipe, 58 is an outer pipe, 61 is a short pipe, 62 is a gas outlet, 63 is an outlet member, G is grease, and A is a gas flow.

Claims (1)

[Claims] 1. A nozzle mechanism that enters a tube end and sprays lubricant onto a threaded portion in the tube end, and a mechanism that moves the nozzle mechanism back and forth in an axial direction relative to the tube end. , a cover surrounding the tube end when the nozzle mechanism is inserted into the tube end; the nozzle mechanism includes a fixed support tube having a lubricant supply hole and a gas supply hole; and the fixed support tube. It consists of a rotary cylinder rotatably supported around the rotary cylinder, and a nozzle head attached to the front of the rotary cylinder, and the nozzle head includes an inner pipe having a central hole communicating with the lubricant supply hole, and a nozzle head mounted around the inner pipe. a plurality of short tubes having an outer tube fitted across an annular space communicating with the gas supply hole, and a lubricant outlet passing through the inner tube and the outer tube in a radial direction and communicating with the center hole of the inner tube; and an outlet member that forms a gas outlet passage communicating with the annular space around the short pipe. 1. A device for applying lubricant to a threaded portion on an inner surface of a tube. 2. The lubricant application device for a threaded portion on an inner surface of a tube according to claim 1, wherein the spread angle of the lubricant blown out from the lubricant outlet is adjusted by the compressed gas blown out from the gas outlet path.