CN2450373Y

CN2450373Y - Improved power wrench torque adjusting valve

Info

Publication number: CN2450373Y
Application number: CN 00255290
Authority: CN
Inventors: 傅永森
Original assignee: 傅晖
Priority date: 2000-10-09
Filing date: 2000-10-09
Publication date: 2001-09-26
Anticipated expiration: 2010-10-09

Abstract

The utility model relates to a power wrench torque adjusting valve which is used for unloading a screw thread on an oil well pipe column on the oil field. The valve is composed of a valve body, a valve core, a spring, a valve cap, a leading screw, a back cap and an end plug. The valve is connected in series between a power wrench hand-operated direction valve and a main wrench oil motor. The valve is matched with a power wrench torque sensor capable of automatically making up oil, which forms the power wrench torque regulation technology which only regulates a make-up torque. Because of the application of the technology, the technical performance of the power wrench torque regulating control system can be conspicuously improved and service life is prolonged, which enables the power wrench torque regulating technology more applicable and more reliable.

Description

A kind of improved Power Tong torque adjustment valve

The utility model relates to the Power Tong that is used for unloading the oil well pipe male screw in the oil field drilling engineering, particularly the torque adjustment valve of Power Tong control torque wrench moment.

Oilfield tubing string, particularly oil well casing and oil pipe tubing string have strict requirement to torque wrench moment, the sleeve pipe or the oil pipe of different grade of steels, different tube diameters, different best torque wrench moment values is arranged,, could guarantee the suitable strength and the optimal seal of tubing string by detaining on the best torque wrench moment value.Best torque wrench moment value, by being set on Power Tong, realizes by the torque adjustment valve, and existing torque adjustment valve is two-way control, has both controlled button, also controls shackle, its weak point, the one,, the shackle moment of torsion that should not control is controlled, and has increased the flow passage resistance force of waterproof that shackle turns to, the pressure reduction of oil motor inside when having reduced shackle has reduced the shackle ability of Power Tong.Because the existence in gap between spool step and the valve body, in let out unavoidably, under the big pressure reduction of shackle, Power Tong shackle rotating speed and dynamic load impact force all can weaken to some extent, influence the performance of Power Tong shackle ability.The 2nd,, the shackle moment of torsion of oil well pipe, normally 2～4 of torque wrench moment times, torque control valve is provided with physical dimension to satisfy the shackle moment of torsion, and by a push rod transfer torque sensed pressure, not only structure is loaded down with trivial details, and increase the sealing level, and increased frictional resistance, reduced the sensitivity of torque control valve.The 3rd,, required because of structure, spool and push rod contact position are provided with and big vent hole, and the oilhole that promptly leaks in case sealing ring has wearing and tearing slightly, outside seepage oil will occur.The 4th,, the shackle moment of torsion that should not control is controlled, the operating frequency of torque control valve is doubled, working life reduces half, and is prone to fault, increases maintenance cost, and even influence the operate as normal of Power Tong, as the patent No. is ZL97235655X, and name is called: " hydraulic power tongs torque control valve " is ZL972356541 with the patent No., and name is called: the existing Power Tong moment of torsion control technique that " hydraulic power tongs torque sensing mechanism " is complementary comes to this.

The purpose of this utility model, to overcome the deficiencies in the prior art part exactly, provide a kind of simple for structure, highly sensitive, long service life, the leakage of oil of not exosmosing, do not influence a kind of improved Power Tong torque adjustment valve of Power Tong shackle ability, with number of patent application be 992577594, name is called: " the Power Tong torque sensor of the automatic makeup oil of a kind of energy " is complementary, and constitutes improved Power Tong moment of torsion regulation and control new technology.

The technical solution of the utility model is: the torque adjustment valve is made up of valve body, spool, main spring, auxiliary spring, spring base, bonnet, leading screw, back of the body cap and end plug.Spool is contained in the valve opening of valve body, valve opening has two sections expansions, constitute control oil pocket and overflow oil pocket respectively and between the spool, valve opening end near control oil pocket one side, the union end plug, make spool spacing, and can join with the sensed pressure oil circuit of torque sensor, the sensed pressure oil of torque sensor acts directly on the spool end; Near the valve opening outer end of overflow oil pocket one side, connect bonnet, the bonnet built-in spring, spring one end is supported on the spool by spring base, and spacing by the valve opening end face, and the spring other end is supported on the leading screw on the bonnet.Spool has an annular groove on control oil pocket section, spool is when the spring direction moves, and the spool annular groove can be linked up control oil pocket and overflow oil pocket.Controlled through hole and not controlled through hole are arranged on the valve body, controlled through hole communicates with the control oil pocket, controlled through hole oil-feed, during not controlled through hole oil return, Power Tong does to go up the rotation of button direction, otherwise, not controlled through hole oil-feed, during controlled through hole oil return, Power Tong is done the rotation of shackle direction, has the internal channel can be with the oil back chamber communication of overflow oil pocket and adjacent valve member on the valve body.Valve body has four through holes for four jiaos, passes four screws and valve body can be serially connected with formation integrated hydraulic loop between the hydraulic part of front and back.During work, turn leading screw, regulating spring pressure can make Power Tong obtain different torque wrench moment values.

Enforcement of the present utility model will significantly improve the technical performance of Power Tong moment of torsion regulator control system, prolongs its application life, makes Power Tong moment of torsion control technique more suitable, more reliable, economic benefit and obvious social benefit.

Below in conjunction with accompanying drawing the utility model is elaborated.

Fig. 1 is the utility model structural representation;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the B-B sectional view of Fig. 1;

Fig. 4 is the C-C sectional view of Fig. 1;

Fig. 5 is the hydraulic circuit diagram of the utility model and correlation technique.

As shown in Figure 1, the utility model is made up of valve body (2), spool (3), main spring (10), auxiliary spring (11), spring base A (8), spring base B (13), bonnet (12), leading screw (14), back of the body cap (15), end plug (1).Spool (3) is contained in the valve opening of valve body (2), valve opening has two sections expansions, constitute control oil pocket (4) and overflow oil pocket (7) respectively and between the spool, valve opening end near control oil pocket one side, union end plug (1), make spool spacing, and can join, the sensed pressure oil of torque sensor is acted directly on the spool end with the sensed pressure oil circuit of torque sensor.The Power Tong torque sensor of coupling is a patented technology, and name is called: " the Power Tong torque sensor of the automatic makeup oil of a kind of energy ", number of patent application is 992577594.Valve opening outer end near overflow oil pocket one side, connect bonnet (12), dress main spring (10) and auxiliary spring (11) in the bonnet, spring one end is supported on the spool (3) by spring base A (8), and spacing by the valve opening end face, the spring other end is supported on the leading screw (14) on the bonnet by spring base B (13), turn leading screw (14), adjustable springs pressure is promptly regulated the torque sensing pressure that balances each other with spring pressure, when torque sensing pressure increased, spool was to the displacement of spring direction.Spool has an annular groove (5) on control oil pocket section, spool is when the spring direction moves, and spool annular groove (5) can be linked up control oil pocket (4) and overflow oil pocket (7), makes power oil short circuit overflow.Controlled through hole (6) and not controlled through hole (9) are arranged on the valve body, controlled through hole (6) communicates with control oil pocket (4), controlled through hole (6) oil-feed, during not controlled through hole (9) oil return, Power Tong does to go up the rotation of button direction, otherwise, not controlled through hole (9) oil-feed, during controlled through hole (6) oil return, Power Tong is done the rotation of shackle direction.Internal channel (17), (16) are arranged on the valve body, the overflow oil pocket (7) and the oil back chamber of adjacent valve member can be linked up.Valve body has four holes (18) for four jiaos, is used to wear screw, forms the integrated hydraulic loop before and after valve body (2) can being serially connected between the hydraulic part, and this not only makes compactness simple for structure, and can reduce the oil circuit drag losses.

Bonnet (12) built-in spring decide on torque adjustment range values size, the torque adjustment range values than hour, can only adorn a spring.

As shown in Figure 2, constitute control oil pocket (4) between the reaming of valve body (2) and the spool (3), have controlled through hole (6) to communicate on the valve body with control oil pocket (4).

As shown in Figure 3, constitute overflow oil pocket (7) between the reaming of valve body (2) and the spool (3), overflow oil pocket (7) has internal channel (17), (16), can communicate with the oil back chamber of adjacent valve member.

As shown in Figure 4, not controlled through hole (9) is arranged on the valve body (2), directly pass through from valve body, be not subjected to spool (3) control, oil is smooth logical without hindrance.

As shown in Figure 5, the utility model (22) is serially connected between hand-operated direction valve (20) and the main pincers oil motors (21).Control oil channel of the present utility model and torque sensor (25) (are that application number is: 992577594, the name be called: " the Power Tong torque sensor of the automatic makeup oil of a kind of energy ") torque sensing pressure oil circuit join, back-up tong tooth bar plunger cylinder (24) is in parallel with main pincers oil motor (21) oil circuit, pressure meter (23) shows torque sensing pressure, this force value and Power Tong moment of torsion are proportional, therefore, the just corresponding torque meter of this pressure meter, pressure meter (19) shows the power oil force value.

When oil circuit A is the power oil oil-feed, when oil circuit B was oil return, Power Tong was done the rotation of shackle direction, the utility model (22) is inoperative, main pincers back-guiding rods (26) contact slotted hole downwards to diagram in torque sensor (25) slotted hole, torque sensor is also inoperative.

When oil circuit B is the power oil oil-feed, when oil circuit A is oil return, Power Tong does to go up the rotation of button direction, at this moment, main pincers back-guiding rods (26) press liter to illustrating upwards contact plunger in the torque sensor oil cylinder, when rising to setting value, the utility model (22) overflow, the stall of main pincers oil motor, the Power Tong torque wrench moment is regulated and control.

Claims

1. improved Power Tong torque adjustment valve, contain valve body, spool, main spring, auxiliary spring, spring base, bonnet, leading screw, back of the body cap and end plug, spool is contained in the valve opening of valve body, valve opening has two sections expansions, constitute control oil pocket and overflow oil pocket respectively and between the spool, valve opening end union end plug near control oil pocket one side, valve opening outer end near overflow oil pocket one side connects bonnet, the bonnet built-in spring, spring one end is supported on the spool by spring base, and it is spacing by the valve opening end face, the spring other end is supported on the leading screw on the bonnet, it is characterized in that: spool has an annular groove on control oil pocket section, controlled through hole and not controlled through hole are arranged on the valve body, controlled through hole communicates with the control oil pocket, controlled through hole oil-feed, during not controlled through hole oil return, Power Tong does to go up the rotation of button direction, otherwise, when not controlled through hole oil-feed, controlled through hole oil return, Power Tong is done the rotation of shackle direction, have internal channel that the oil back chamber of overflow oil pocket and adjacent valve member is linked up on the valve body, by the end plug, the sensed pressure oil of Power Tong torque sensor acts directly on the spool end.

2. a kind of improved Power Tong torque adjustment valve as claimed in claim 1 is characterized in that: can only adorn a spring in the end cap.

3. a kind of improved Power Tong torque adjustment valve as claimed in claim 1, it is characterized in that: valve body has the four-way hole for four jiaos, can pass four screws valve body is serially connected with formation integrated hydraulic loop between the hydraulic part of front and back.