JPH0353992B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to lubricant application of a threaded part on the inner surface of a pipe, for example, in which a lubricant such as grease is evenly applied to the threaded part on the inner surface of a pipe joint connected to a pipe end. It is related to the device.

[Prior Art] 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.

The present applicant has already filed Japanese Patent Application Laid-Open No. 58-219965 as a lubricant application device for such a threaded portion on the inner surface of a tube. That is, this application sprays lubricant together with compressed gas from a high-speed rotating nozzle head that enters and exits the pipe end, and applies the lubricant to the threaded portion.
A brush installed coaxially with the nozzle head evens out the applied lubricating oil. However, since the axis of the nozzle head is fixed, if the diameter of the pipe to which lubricant is to be applied changes significantly, it is necessary to replace the nozzle head and brush in its entirety. There are problems in that it requires time and effort, and many types of nozzle heads and brushes must be prepared. Further, for a tube with a large diameter, the nozzle head, brush, etc. will also be large, and the device for supporting them will have to be large-scale, which is a drawback.

[Object of the Invention] An object of the present invention is to make the nozzle head rotate, and to solve the drawbacks of the conventional example.
By rotating eccentrically from the axis in accordance with the pipe diameter, it is possible to follow changes in the pipe diameter, and the conventional recombination work of nozzle heads, etc., can be omitted, and the types of nozzle heads and brushes that should be kept can be changed. An object of the present invention is to provide a lubricant application device for a threaded portion on the inner surface of a tube, which can significantly reduce the number of units.

[Summary of the invention] The gist of the present invention for achieving the above object is as follows:
A nozzle head that enters the pipe end and sprays lubricant onto the threaded part on the inner surface, a mechanism that moves the nozzle head back and forth in the axial direction relative to the pipe end, and a mechanism that moves the nozzle head from the axis according to the inner diameter of the pipe end. This is a lubricant application device for a threaded portion on an inner surface of a tube, characterized by comprising an eccentric adjustment mechanism for eccentricity, and a planetary movement mechanism for causing the eccentric nozzle head to rotate on its own axis and revolve around the inner surface of the tube end.

[Embodiments of the Invention] The present invention will be described in detail based on illustrated embodiments.

FIGS. 1 and 2 show 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 mainly 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 that reciprocates 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 mounted on the base 20, and a frame 23 fixed to the base 20 includes a nozzle mechanism 5, a cover 24 surrounding the nozzle mechanism 5,
An oil reservoir 2 attached to this cover 24 to receive grease.
5 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, and its piston rod 32 is connected to the base 20 of the movable base 2,
Limit switches 10, 11, 12 on rail 1
A predetermined reciprocating position of the movable base 2 is determined by the operating cams 26 and 27 of the movable base 2.

In the drive mechanism 4, a motor 40 and a reduction gear 41 are attached to a base 20, and a gear 43 is fixed to an output shaft 42 of the motor 40.
It is designed to drive a large diameter gear 44 meshed with each other through. A guide disk 45 is superimposed on the gear 44, and the 3
It is rotatably supported by two guide rollers 46. Further, a planetary gear 48 is rotatably attached to a shaft 47 eccentrically attached to the guide disk 45, and this planetary gear 48 is connected to the frame 23.
A fixed gear 49 having internal teeth and a rotating cylinder 5 to be described later.
It is meshed with a sun gear 50 provided around 5.

A support cylinder 51 of the nozzle mechanism 5 is eccentrically supported by a guide disk 45, and this support cylinder 51 is provided with a grease supply port 52 and a gas supply port 53 for supplying compressed air, and is connected to a conduit (not shown). and are respectively connected to a grease supply device and a compressed gas supply device. A rotary joint 54 is attached to the support tube 51.
A rotary cylinder 55 is connected through the rotary cylinder 55.
A nozzle head 56 is attached to the front end of the nozzle.

The nozzle head 56 has a structure in which an inner tube 57 and an outer tube 58 are fitted together as shown in FIG. Further, an annular space 60 between the inner tube 57 and the outer tube 58 is communicated with the gas supply port 53 of the support tube 51. Nozzle head 5
A crosswise hole is made in the inner tube 57 at the tip of the tube 6, and a short tube 61 is inserted therein, from which grease is spouted in all directions. Further, an air outlet member 63 having a gas outlet 62 of a predetermined diameter is attached around the tip of the short pipe 61, and a required gas outlet path is formed between the outer surface of the short pipe 61 and the inner surface of the air outlet member 63. It is formed. Furthermore, the tip of the center hole 59 is connected to the plug 6.
4 is occluded.

Further, the guide disk 45 is provided with an eccentric adjustment mechanism for eccentrically centering the axis of the nozzle head 56. That is, the rotary joint 54 is fitted into an eccentric curved hole 71 provided in a guide disk 45, and the guide disk 45 is provided with a block 73 to which an eccentric adjustment shaft 72 is screwed. A forked engagement portion 74 is engaged with the rotary joint 54 around the support tube 51 . When the eccentric adjustment shaft 72 is twisted with a spanner or the like, the forked engagement portion 74 moves and moves the rotary joint 54 along the eccentricity curved hole 71, aligning the axes of the support tube 51 and nozzle head 56 with the gear. 44
It is designed so that it can be eccentric from the center. The amount of eccentricity can be directly or converted into the pipe diameter, and the amount of movement of the block 73 can be finely adjusted by supporting the scale 75.

For example, three brushes 76, 77, and 78 are mounted concentrically around the nozzle head 56 to evenly spread the grease applied to the threaded portion. brush 76
is normally used without being removed, and the brush 77 is removably provided around the nozzle head 56.
The brush 78 is dedicated to small diameter pipes, and this brush 78
When using the brush 77, the brush 77 is removed. The grease ejected from the nozzle head 56 is ejected from the gap between the brushes 77.

Next, the operation of this device will be described. First, the hydraulic cylinder 30 is set to the retracted position, and the distal end of the pipe fitting C screwed onto the threaded pipe P is transferred to a predetermined position by a transfer mechanism (not shown). The movable base 2 is advanced by the cylinder mechanism 3, and the nozzle head 56 and the brushes 76, 77, 78 are inserted into the pipe joint C. The movement of the movable base 2 is controlled by limit switches 10, 11. Next, the motor 40 is started and its driving force is transferred to the reduction gear device 4.
1. Transmitted to gear 44 via output shaft 42 and gear 43. The gear 44 rotates together with the guide disk 45 while being supported by the guide roller 46, and the planetary gear 48 supported by the guide disk 45 by the shaft 47 also performs planetary motion around the sun gear 50, and the rotating cylinder 55. Rotate the nozzle head 56. In this case, since the rotary joint 54 is interposed between the rotary cylinder 55 and the support cylinder 51, the support cylinder 51 is fixed with respect to the rotation of the rotary cylinder 55. here,
If the support tube 51 is eccentric from the axis of the gear 44, the rotating tube 55 and nozzle head 56 will revolve along the inner surface of the pipe joint C as shown by arrow A in FIG. It rotates as shown by arrow B.

Next, grease of a predetermined standard is supplied from a grease supply device (not shown) to the grease supply port 52 of the support cylinder 51 at a pressure of, for example, 30 kg/cm ² , and is passed through the center hole 59 of the nozzle head 56 to the tip of the short pipe 61. Grease G is blown out as shown in FIG.
At the same time, when compressed gas of, for example, 2 to 4 kg/cm ² is supplied from a compressed gas supply device (not shown) to the gas supply port 53 of the support tube 51, this compressed gas is supplied to the annular space 60 between the inner tube 57 and the outer tube 58. Short pipe 6
1 and is blown out from the gas outlet 62 as a gas flow surrounding the grease G. The blown compressed gas spreads outward due to a pressure drop, and the grease G is blown out at a certain angle accordingly. Therefore, by selecting the gas pressure value, the spreading angle of the grease G from the short pipe 61 can be set to a desired value.

Then, since the nozzle head 56 moves along the inner surface of the pipe joint C, the grease G is deposited on the inner surface. At this time, by operating the cylinder mechanism 3 to reciprocate the movable base 2 by a predetermined distance, the brushes 76 and 77 can evenly spread the grease G on the threaded portion of the inner surface of the pipe joint C. When the short pipe 61 comes out of the pipe joint C, the jetted grease G adheres to the inner surface of the cover 24 and flows down into the oil sump 25 to be recovered and reused.

Brush 7 attached to nozzle head 56
6 and 77 serve to even out the applied grease G, but if the inner diameter of the pipe to which grease is to be applied is an appropriate size for the diameter of these brushes 76 and 77, the nozzle head 56 should be No need to make it eccentric. If the pipe diameter is too small to insert the brush 77 into the pipe joint, the brush 77 may be removed and the brush 78 at the tip may be used to smooth out the grease when the nozzle head 56 returns.

The compressed gas flow determines the spread of the grease G, but also plays a role in preventing grease from clogging. That is, by blowing out compressed gas for a short time even after the spraying of grease has stopped, the remaining grease in the short pipe 61 is sucked and blown away, thereby preventing the grease from dripping.

The nozzle head 56 is moved forward and backward by the movable base 2.
It may be done relative to the pipe joint C, and the threaded pipe P may be moved back and forth. In addition, internal threads are not necessarily limited to pipe fittings.
Of course, this method can also be applied to cases in which the inner surface of the tube is directly threaded.

[Effects of the Invention] As explained above, the device for applying lubricant to the threaded portion on the inner surface of a pipe according to the present invention allows the nozzle head and the brush to rotate on their own axis and to revolve at an eccentric speed, making it possible to apply lubricant to a pipe with a large diameter. The lubricant can also be applied using a small device. Further, there is no need to replace the nozzle head etc. each time the pipe diameter is changed, which not only omits the reassembly work but also greatly reduces the types and quantity of nozzle heads etc. to be held.

[Brief explanation of drawings]

The drawings show an embodiment of a lubricant application device for a threaded portion on the inner surface of a tube according to the present invention, in which Fig. 1 is a partially cutaway side view, Fig. 2 is a perspective view of the drive mechanism and nozzle mechanism, and Fig. 3 is a perspective view of the drive mechanism and nozzle mechanism. The figure is a partially enlarged sectional view of the nozzle mechanism.
FIG. 4 is an explanatory diagram of a state in which grease is being 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, 44 is a gear, 45 is a guide disk, 46 is a guide roller, 48 is a planetary gear, 49 is a fixed gear, 5
0 is a sun gear, 51 is a support cylinder, 52 is a grease supply port, 53 is a gas supply port, 55 is a rotating cylinder, 56 is a nozzle head, 71 is a curved hole for eccentricity, 72 is an eccentricity adjustment shaft, 73 is a block, 76, 77 and 78 are brushes, C is a pipe joint, and G is grease.

Claims (1)

[Scope of Claims] 1. A nozzle head that enters the pipe end and sprays lubricant onto the threaded portion on the inner surface, and a mechanism that moves the nozzle head back and forth in the axial direction relative to the pipe end;
A pipe interior characterized by comprising: an eccentricity adjustment mechanism that decenters the nozzle head from the axis according to the inner diameter of the tube end; and a planetary motion mechanism that causes the eccentric nozzle head to rotate on its own axis and revolve around the inner surface of the tube end. A device for applying lubricant to face threads. 2. The device for applying lubricant to a threaded portion on an inner surface of a tube according to claim 1, wherein the eccentricity adjustment mechanism moves a support shaft connected to the nozzle head along an eccentricity curved hole. 3. The planetary motion mechanism includes a large-diameter internal gear centered on the axis, a sun gear disposed around the support shaft, and a planet interposed between the internal gear and the sun gear to transmit driving force. A lubricant application device for a threaded portion on an inner surface of a tube according to claim 3, comprising a gear. 4. The device for applying lubricant to a threaded portion on an inner surface of a tube according to claim 1, wherein a brush is attached near the nozzle and coaxially with the nozzle to even out the lubricant applied to the threaded portion. 5. An apparatus for applying lubricant to a threaded portion on an inner surface of a tube according to claim 4, wherein the brush is disposed around the nozzle head and is removable. 6. The lubricant application device for a threaded portion on an inner surface of a pipe according to claim 1, wherein compressed gas is blown out from the nozzle head in conjunction with the spraying of the lubricant.