JPS586037B2 - Tongs that can be used for various purposes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved power driven pivoting tong or gripping device for rotating well pipes and the like.

In connecting and separating connections of well pipes, such as well bore pipes, one pipe is held in a fixed position by a support wrench or tongs, and the lengths of the mating pipes are rotated in one or the other direction. be rotated.

Various devices have been used to rotate the pipes at high speed during initial connection or final disconnection.

Other devices have also been used to finally connect and initially disconnect connections.

A common procedure for high speed rotation of pipes is to use so-called swivel chains, which are dangerous to use.

Swivel tongs have been developed that include a swing head or drive roller that is engageable with the pipe to rotate the pipe.

However, pipe diameters vary significantly from time to time, requiring a pipe gripping mechanism that is operable over a range of different pipe sizes.

More particularly, the invention relates to a power-driven swivel tong of the type having rollers for gripping a pipe, some of these rollers being rotatable to drive the pipe in rotation, the rollers being mounted on a lever arm. The lever arms are rotatable and can be expanded so that the tongs are engaged with and removed from the pipe, and closed so that the rollers firmly grip the pipe and rotate it. It has become possible to do so.

The rollers that grip and drive the pipe are rotatably supported on a pair of lever arms that pivot about a common pivot axis by the action of a wedge-shaped actuator.

This actuating device is capable of reciprocating movement by means of an actuating cylinder.

An adjustment device is provided on the lever arm so that the tongue is adjustable to accommodate pipes of various sizes in response to uniform actuation cylinder and wedge strokes;
This minimizes the size and mass of the cylinder and support frame structure, making the tongs easier to handle and requiring less equipment volume.

In order to accomplish the above, the tongs have roller-supported lever arms that are provided with adjustable ends, and the lever arms are arranged to grip the pipe so that the ends are moved closer together and away from each other. The expansion device is adapted to be moved into adjusted positions closer to and further away from the spreader.

In particular, the actuating device includes an expansion wedge block reciprocable by an actuating cylinder, the end of the lever arm being adjusted to move the lever arm closer or further apart to change the action of the wedge block on the lever arm. It looks like this.

A further pair of pipe swirl rollers are mounted on adjustable shafts in close proximity to and spaced apart from the other pair of rollers, the spacing between adjacent rollers being varied to adapt the tongs to pipes of various sizes. That's what I do.

The present invention has many other advantages and has various other objects that become more apparent when considering the form in which the invention is embodied.

This configuration is illustrated in the accompanying drawings, which form a part of this specification.

Although detailed below for the purpose of illustrating the general principle of the present invention,
It is to be understood that the following detailed description is not meant to limit the invention.

Referring first to FIGS. 1 and 2, the adjustable power-driven pivoting tongs or gripping apparatus of the present invention generally includes a suitable motor 2 mounted with a drive motor 2, shown generally as a typical pneumatic motor in the illustrated embodiment. contains frame 1.

A pair of elongated levers 3 and 4 are drivably mounted on the frame 1 and are adapted to be pivoted about a common axis 5.

These levers have an elongated arm 6 extending along the side of the frame 1 and forming an actuating lever arm;
As a result, the pipe gripping lever arms 7 are moved into and out of gripping engagement with the pipe P, and moved toward and away from each other.

An opposing drive roller 8 and an opposing idle roller 9 are supported by the gripping lever arm 7 .

As explained below, drive rollers 8 are driven in either direction by motor 2 to effect rotation of pipe P when it is gripped between rollers 8 and 9 as shown in FIG. It looks like this.

The rollers 8 and 9 are made of or coated with an elastic material, which is adapted to be elastically deformable by the pipe gripping pressure and to provide good frictional gripping of the pipe in a known manner.

The levers 3 and 4 are pivoted as a whole about an axis 5 by an actuating device indicated at 10 to move the actuating lever arm 6 outwardly to close the gripping lever arm 7 and to pull the actuating lever arm 6 back for gripping. It is operable to open the lever arm 7.

More specifically, the actuating device 10 is an expansion wedge or block 1.
1, which is slidably arranged relative to the frame 1 and connected to an operating rod 12 projecting from an operating cylinder 13, which is fixed to the frame 1 by a tie bolt 14.

The husband levers 3 and 4 have at the outer ends of their actuating arms 6 an adjustable device 15 carrying rollers 16 that can be engaged with wedge surfaces 17 on opposite sides of the wedge block 11, thereby allowing the actuating rods 12 When the lever arm is extended, the lever arm is actuated in the pipe gripping direction.

Also supported by an adjustable device 15 is a lever retraction link 18 which is engageable with the wedge block 11 and which operates the lever in response to longitudinal movement of the wedge block 11 when the actuating rod 12 is retracted. It is designed to be pulled back from the gripping engagement state with the pipe.

The purpose of the adjustable device 15, which will be detailed below, is to form an adjustable link between the husband's actuating lever arm 6 and the roller 16, by which the lateral distance between the rollers 16 can be adjusted. The wedge block 11 allows the gripping jaws to close on pipes of a wide variety of sizes in response to short, uniform strokes of the actuating rod 12.

The construction of such an adjusting device not only allows the tongs to be effectively utilized for pivoting pipes of a variety of size ranges, but also allows the short stroke actuating cylinder to reduce the overall size and volume of the pivot tong assembly. This makes it possible to minimize the

As already mentioned, the levers 3 and 4 are pivotably mounted about a common pivot pin 5.

At this store, lever 3 is installed as best shown in Figure 5.
has a pair of vertically spaced width plates or flanges 19 and 20, and the lever 4 has a pair of vertically spaced width plates or flanges 19 and 20 which are horizontally overlapping or interfitting with the width plates or flanges 19 and 20 of the lever 3. It has spaced intermediate plates or flanges 21 and 22.

The frame 1 has a support portion 23 located between the vertically spaced flanges 19 and 22 of the main levers 3 and 4.
has.

The husband flanges 19-22 are all supported on pins or shafts 24 which extend through a support frame portion 23 and downwardly into a gear case 25 which is connected to the drive gear arrangement described below. The motor 2 drives the rotating roller 8.

The swivel roller 8 is adapted to be rotated in either direction by means of a pipe frictionally engaged between the drive roller 8 and the idler roller 9 by a suitable drive gear arrangement, shown in its entirety in FIG. The gear device described above is arranged in the gear case 25 described above.

This gearing includes an output gear 26 driven by the motor 2, which gear meshes with an idle gear 27 which drives a common gear 28 which also meshes with a pair of idle gears 29. Idol Gya 29
is adapted to drive the drive gear 30 of the husband's drive roller 8.

In this gearing system, the drive rollers 8 are driven in the same direction, such that engagement of the drive rollers on opposite sides of the pipe drives the pipe in a selected direction in relation to the direction in which the motor 2 is driven. It comes with being there.

Referring now to Figures 6 and 7, the roller 9 can be positioned either in a first position relative to the roller 8 on the gripping arm T (Figure 6) or in a second position closer to the roller 8 (Figure 6). (Fig. 7), so as to be adjustably mounted by means of a device enabling it to be mounted on any of the pipes (Fig. accompanies.

The rollers 9 are attached to the upper and lower flanges 32 of the gripping arm 7.
and 33 are suitably rotatably supported on a pin or shaft 31 extending therebetween.

The head 34 of the shaft 31 is generally rectangular in shape and the shaft is eccentric with respect to this head.

Flange 32 has a rectangular seat 35 that receives head 34.

On opposite sides of the head 34 are end projections 36 which extend into recesses 37 in the flange 32 at the ends of the seat 35.

The lower flange 33 has a seat 39 and a bore 38 for receiving a bushing 40 having an eccentric opening 41 for receiving the shaft 31.

A retainer 42 is used below flange 33 to hold bushing 40 and shaft 31 in place.

When the retainer 42 is removed from the shaft 31, the shaft is removed from the rollers and rotated 180 degrees, and the bushing 40 is rotated 180 degrees.
When the shaft 31 is rotated through 80 degrees and reassembled, the shaft 31 is moved toward or away from the drive roller 8.

An adjustable device 15 for supporting the wedge rollers 16 so as to vary the width between the wedge rollers 16 is connected to the husband's lever 3.
and 4, consisting of the assembly best shown in FIGS. 8 and 9.

The actuating lever arm 6 has a groove 43 at the end, and the crank 4
4 is disposed within the groove 43 and spans the groove 43.
Pivotably mounted on the top.

One arm 46 of the crank 44 is grooved at 47 to receive a roller 16 rotatably mounted on an axle 48 spanning the groove 47.

The other arm 49 of the crank 44 is grooved at 50 to receive the head 51 of the adjusting screw 52.

A quick-removable pin 53 extends through the head 51;
An adjustment screw 52 is connected to the crank arm 49.

The adjusting screw 52 is screwed into an adjusting link 54 which is pivotally mounted on a pin 55 carried on the lever arm 6.

When pin 53 is withdrawn, adjustment screw 52 can be rotated relative to link 54 and pins 53 and 5
5 can be effectively increased or decreased, thereby allowing the roller 16 to be moved toward or away from the wedge block 11.

In this way, a given stroke of the wedge holder 11 causes the lever 6 to be spread out more or less by adjusting the adjustment device 15, so that the rollers 8 and 9 engage and pivot on different pipe sizes. It can operate like this.

When the wedge block 11 is pulled back by the actuating cylinder 13, the previously mentioned link 18 causes the actuating lever arm 6 to be pulled back.

The link 18 is a shaft 4 that supports the wedge roller 16 at 18a.
8.

The retraction link 18 has at its free end a roller 18b arranged in the recess 18c of the wedge block 11, which roller is pulled back from the position of FIG. 1 to the position of FIG. 4 by retraction of the wedge block 11. , which causes the tensioning and gripping arms 1 to spread out in such a way that the ends of the actuating arms 6 are brought closer to each other.

[Brief explanation of the drawing]

FIG. 1 is a top plan view of a powered pivoting tong made in accordance with the present invention showing the gripping rollers engaging the pipe; 2 is a side elevational view of the pivoting tong of FIG. 1; FIG. FIG. 3 is a partially enlarged view showing the drive mechanism of the pipe turning roller. FIG. 4 is a top plan view corresponding to FIG. 1 showing the jaws in an open position; FIG. 5 is a partially detailed cross-sectional view taken along line 5--5 of FIG. 1 showing the pivotable mounting of the lever on the support frame; FIG. 6 is a partial sectional view taken at 6-6 of FIG. 1, with some portions shown in elevation and showing the adjustable roller installation; FIG. 7 is a partial plan view showing the adjustment roller in a different position compared to the position in FIG. 6; FIG. 8 is a partially detailed cross-sectional view taken along line 8--8 of FIG. 2 showing the lever end adjustment mechanism. FIG. 9 is a cross-sectional view taken along line 9--9 of FIG. 8. 1... Frame, 2... Drive motor, 3, 4... Lever, 6... Arm,
7... Gripping lever arm, 8... Drive roller, 9... Idle roller, 10...
... Actuation device, 11 ... Wedge block, 12
...... Operating rod, 13...... Operating cylinder, 15... Adjusting device, 16... Roller, 18... Lever retraction link, 25...
... Gear case, 42 ... Retainer, 44.
...Crank, 52 ...Adjustment screw, 54
...Adjustment link.

Claims (1)

[Claims] 1 a frame kozo 1, a pair of elongated levers 3 and 4,
a pivoting device 5 for pivotally mounting said lever on said frame structure such that said lever extends in opposed, laterally spaced relation; The pivot device has opposing actuating arms 6, 6 on the other side, and has an opposing pipe gripping arm 7, 7 on the other side of said pivot device, which is further supported by said gripping arm and, by the expansion of said actuating arm, allows the pipe P to be removed. a pipe gripping roller device 8, 8, 9.9 that operates to grip and engage with the pipe gripping roller device 8, 8, 9.9, an actuating device 10 that expands the actuating arm, and rotates the pipe gripping roller device and the pipe gripped thereby. a power-driven pipe-swivel tong comprising a clamping drive device (2), wherein the actuating arm is adjusted relative to the actuating device to cause the pipe gripping roller device to grip and rotate pipes of a variety of size ranges; A power-driven pipe swivel tong, characterized in that it has an adjustment device 15, as shown in FIG.