CN2154343Y

CN2154343Y - Planetary claw double-way clamping sturture of power pliers

Info

Publication number: CN2154343Y
Application number: CN 93213627
Authority: CN
Inventors: 杨春会
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-05-26
Filing date: 1993-05-26
Publication date: 1994-01-26
Anticipated expiration: 2003-05-26

Abstract

The utility model relates to a planetary claw double-way clamping mechanism for power pliers, which is used for assembly and disassembly of thread connecting pieces of the mud oil engineering of oil fields and is suitable for the clamping mechanism of mouth-closed type power pliers and particular threaded loading and unloading machines. The utility model is composed of a big gear body with inner and outer teeth, a planetary frame, a planetary wheel, a planetary claw, etc. The planetary wheel and the planetary claw are folded and fastened into a whole. The planetary claw forms a y-y axial symmetry. When the inner teeth of the big gear drives the planetary wheel to rotate, one wing of the planetary claw can clamp workpieces, and the other wing can extend from the window opening hole of the big gear body for realizing that the workpiece can be clamped with the large range in both the positive direction and the reverse direction without replacing and turning any parts.

Description

Planetary claw double-way clamping sturture of power pliers

The utility model relates in the oil drilling petroleum production engineering, is used for unloading a kind of Power Tong planet pawl bidirectional clamping mechanism of thread connector, and this mechanism is applicable to the closed type Power Tong, is specially adapted to the clamp mechanism of screw thread charging crane, and main pincers back-up tong all is suitable for.

Present Power Tong planet pawl clamp mechanism all is to be with the local gear teeth on the planet pawl, and with the internal tooth engagement of binding clip gear wheel, the slewing area of planet pawl is limited in the ring gear of binding clip gear wheel.Two kinds of typical structures of prior art, a kind ofly be: the planet pawl is an asymmetrical graphic, the biasing of planet pawl has outer curved block teeth, can only unidirectional clamping work pieces, any caliber in the energy clamping certain limit, but when needing oppositely to clamp, must open the binding clip lid, the upset of taking-up planet pawl is installed or 180 ° of ability realizations of the whole upset of Power Tong is oppositely clamped for 180 °.Owing to limit by the internal tooth space, the adaptable clamping size range of the planet pawl of a specification is very limited, must repeatedly change planet pawl specification when enlarging gripping range, this give to make, uses and keeps in repair all and make troubles, and is that 89200789 " a kind of formula back-up tong " is exactly this structure as the patent No. in China's utility model patent.Another kind is: the planet pawl itself is a pivoted arm, local external tooth on the pivoted arm and the engagement of gear wheel internal tooth, pivoted arm and pliers tooth base hinge joint, pliers tooth base is provided with introversion arc dental lamina, in working order down, the center of rotation of planet pivoted arm and pivoted arm depart from workpiece centre with the line at pliers tooth base hinge joint center.Can realize forward and reverse clamping, but the slewing area of planet pivoted arm is limited in the ring gear still, and each workpiece outside dimension must have a cover pliers tooth base and dental lamina to satisfy, this uses to manufacturing and keeps in repair still and make troubles.Moreover, the clamping performance of this mechanism is influenced greatly by extraneous factor, as the elastic deformation of workpiece outside diameter tolerance, the stressed part of binding clip etc. the ratio of clamping tangential force and clamping normal pressure is changed, and makes to clamp performance and be labile state.As U.S.'s patent No. in 1989 is that " the jaw mechanism of Power Tong and back-up tong " (JAWS FOR POWER TONGS AND BUCKING UNITS) of 4,869,137 is exactly this planet pawl clamp mechanism.

The purpose of this utility model will overcome the deficiencies in the prior art part exactly, provide a kind of clamping size range big, the clamping that adapts to the different-diameter workpiece need not changed any component, the planet pawl that the do not overturn caliper that also do not overturn, the tangential force that workpiece is applied remains unchanged with the ratio of normal pressure, and Power Tong planet pawl clamp mechanism that can forward and reverse clamping.

The technical solution adopted in the utility model is in order to achieve the above object: the shape of planet pawl is with the axisymmetric figure of y-y, and it becomes the space closed state with planetary gear, and is anchored on one by the coupling spindle cover.On the gear wheel main body, there are some groups to window beyond the inside and outside gear teeth, when the internal tooth engagement of planetary gear and gear wheel main body was rotated, a wing of each planet pawl was gathered clamping work pieces by rotating in the same way, and another wing can be windowed from main body and be stretched out.The block teeth that planet pawl both wings outer is fixing, its cusp contour curve is calculated by special computational methods, and when making its clamping arbitrary diameter, the tangential force that workpiece is applied remains unchanged with the ratio of normal pressure.

For realizing technique scheme, the technology formation that the utility model adopts comprises: the gear wheel main body that the gear wheel of an interior external tooth of band and gear cap constitute, be used for containing planet pawl and planet carrier, and transfer torque; One by planetary gear, planet pawl, outcurve block teeth, connect the planet claw assembly that axle sleeve is formed, be used for clamping work pieces; A planet carrier of being made up of gusset piece A, gusset piece B and rotating shaft is used for supporting the planet claw assembly; The arrestment mechanism that gusset piece end, brake(-holder) block, friction plate, brake disc and the tripping spring of a band external splines formed is used for braking planet carrier; One by turning to the controlling organization that turns to that block and shaft head constitute, and is used for controlling binding clip work and turns to.When adopting following embodiment, will obtain compact conformation, the convenient manufacturing, reliable clamping, effect such as sturdy and durable.Below in conjunction with accompanying drawing the utility model is elaborated.

Fig. 1 is the utility model structural representation front view.

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

Fig. 3 is the B-B sectional view of Fig. 2.

With reference to attached Fig. 1 and 2.(1) be gear wheel, (9) are the gear wheel internal tooth, and (15) are the canine tooth wheel cap, between canine tooth wheel cap and the gear wheel with screw fastening formation gear wheel main body, on the main body with respect to each planet pawl window (26).(3) be the planet pawl, (13) be planetary gear, (6) are spline housing, and (7) are rotating shaft, (10) be gusset piece A, (14) be gusset piece B, spline housing is anchored on one with planetary gear and planet pawl, forms the planet claw assembly, planetary gear is meshed with the internal tooth (9) of gear wheel, and rotate around rotating shaft (7), rotating shaft two ends and gusset piece A, gusset piece B tight fit constitute planet carrier, support the planet claw assembly also can rotate in the gear wheel main cavity.The planet pawl is the double-vane structure, and with the y-y axial symmetry, the both wings outer is fixed with different several outcurve block teeth (2,4,5) of curvature, is used for stinging clamping of workpieces.The planet claw assembly is pressed the circumference uniform distribution at binding clip center, and component count is 3～5 groups.

With reference to accompanying drawing 2.(21) be brake(-holder) block, link by spline structure and gusset piece A end (19).(20,22) for friction plate by brake disc (18), tripping spring (17), clamping screw (16), end cap (12) is held on the housing (8), constitutes arrestment mechanism, and planet carrier is produced braking moment.

With reference to accompanying drawing 3.(23) for turning to block, (24) are shaft head, and conversion turns to the direction of block breach (25), just can determine the work of this structure to turn to.Work turns to opposite with the breach direction that turns to block.

During work, driving force drives gear wheel (1) by travelling gear (11) and rotates, planet carrier is temporarily braked, gear wheel (1) drives each planetary gear and rotates, one wing together rotation after workpiece is gathered clamping work pieces of this moment and the fastening planet pawl of each planetary gear, and another wing of planet pawl is protruding from the position of windowing of gear wheel main body, realizes the forward and reverse clamping to arbitrary diameter in the accommodation, and the ratio of the tangential force that acts on surface of the work and normal pressure remains unchanged.

Claims

1, a kind of Power Tong planet pawl bidirectional clamping mechanism, it comprises:

The gear wheel main body that the gear wheel (1) of an interior external tooth of band and gear cap (15) constitute is used for containing planet pawl and planet carrier, and transfer torque;

One by planetary gear (13), planet pawl (3), outcurve block teeth (2,4,5), connect the planet claw assembly that axle sleeve (6) is formed, be used for clamping work pieces;

A planet carrier of being made up of gusset piece A (10), gusset piece B (14) and rotating shaft (7) is used for supporting the planet claw assembly;

The arrestment mechanism that gusset piece end (19), brake(-holder) block (21), friction plate (20,22), brake disc (18) and the tripping spring (17) of a band external splines formed is used for braking planet carrier;

One by turning to the controlling organization that turns to that block (23) and shaft head (24) constitute, and is used for controlling binding clip work and turns to;

Of the present utility model being characterised in that: planet pawl (3) is a kind of with the axisymmetric figure of y-y, it becomes the space closed state with planetary gear (13), and be anchored on one by connecting axle sleeve (6), on the gear wheel main body, there are some groups beyond the inside and outside gear teeth and window (26), when planetary gear (13) rotates with internal tooth (9) engagement, a wing clamping work pieces of each planet pawl, another wing can stretch out from the hole of windowing.

2, a kind of Power Tong planet pawl bidirectional clamping mechanism as claimed in claim 1, it is characterized in that: planet pawl both wings outer is fixed with the different outer curved block teeth of several curvature (2,4,5).

3, as claim 1 and 2 described a kind of Power Tong planet pawl bidirectional clamping mechanisms, it is characterized in that: the planet claw assembly can be 3～5 groups, presses the circumference uniform distribution at binding clip center.