CN201455867U

CN201455867U - Friction pipe plier

Info

Publication number: CN201455867U
Application number: CN2009201095959U
Authority: CN
Inventors: 舒红梅
Original assignee: SANFREE PETROLEUM TECHNOLOGY Co Ltd
Current assignee: SANFREE PETROLEUM TECHNOLOGY Co Ltd
Priority date: 2009-07-03
Filing date: 2009-07-03
Publication date: 2010-05-12
Anticipated expiration: 2019-07-03

Abstract

The utility model relates to a friction pipe plier, which comprises an upper jaw, a lower jaw, a plier handle, a handle and a pin shaft, wherein the jaws are articulated with the plier handle by the pin shaft. The friction pipe plier is characterized in that the upper and the lower jaws are of an arc-shaped structure which is thin in the middle and gradually thickened towards the two ends; the position of the thinnest part NN' of the upper jaw is bias toward one end articulated with the lower jaw corresponding to the center O1 of the jaws, and the position of the thinnest part MM' of the lower jaw and the position of NN' are symmetrical about the center O1 of the jaws; and the head of the plier handle is sequentially provided with an oval head hook and a pin hole, and the tail part of the plier handle is fixedly connected with the handle. The friction pipe plier can be used for completely clasping a pipe fitting in real time, and the pipe fitting does not slip. When in use, the outer surface of the pipe fitting is not damaged by the friction pipe plier, and the friction pipe plier has the advantages of convenient and fast operation and simple structure, and is economic and practical.

Description

Friction spanner for pipe

Technical field

The utility model relates to a kind of pipe wrench, particularly a kind of hood type Friction spanner for pipe.

Background technology

At present, pipe fitting is threaded screws or pine is unloaded existing multiple instrument.Such as: serial Boost pipe tongs, O type Strong pipe wrench, quick Boost pipe tongs, chain wrench etc., these several pipe wrench all can not well be protected outer surface of pipe fittings.And the Friction spanner for pipe of the outer surface of pipe fittings protected that generally use in the oil field is made up of the jaw that pincers handle and griffith woodsorrel herb sheet constitute, and displacement makes the tile radial contraction by the pincers handle, the chucking pipe fitting, and the rotary clamp handle reaches the upward button or the shackle operation of pipe fitting.Tile is to be rigidly connected, and is non-deformable, and there is mismachining tolerance in pipe fitting, and its external diameter size is not determined.So when this pipe wrench was worked, three tile radial contraction produced pressure, the chucking pipe fitting, but fully do not contact with outer surface of pipe fittings, and the general hardness of oil well logging pipe fitting is higher, cause this pipe wrench use in and the real contact area of outer surface of pipe fittings very little, easily skid, not handy.

The utility model content

The utility model provides a kind of Friction spanner for pipe, solve the technical problem that existing Friction spanner for pipe can't be held pipe fitting fully tightly.

The technical scheme that its technical problem that solves the utility model adopts is:

This Friction spanner for pipe, comprise upper jaw, lower jaw, pincers handle, handle, and with jaw and the hinged bearing pin of pincers handle, it is characterized in that: it is thin that upper jaw and lower jaw are the middle part, to the two ends arcuate structure of thickening gradually, the position of upper jaw thinnest part NN ' is with respect to jaw center 01 deflection and the hinged end of lower jaw, and the position of lower jaw thinnest part MM ' and the position of NN ' are about jaw center 01 symmetry; The pincers negative winding stem has oval head crotch and pin-and-hole successively, and the pincers handle tail is fixedlyed connected with handle;

Described upper jaw one end is hinged by bearing pin one and lower jaw, the other end is hinged with the pincers handle by bearing pin two, upper jaw is enclosed the jaw that contacts with outer surface of pipe fittings with the circular arc of lower jaw inboard, and upper jaw and lower jaw are having the gap that enough is out of shape for jaw near the pincers shank portion;

Described lower jaw is a crotch that is combined by a bit of elliptic arc and a bit of circular arc with the part that the pincers negative winding stem contacts, and be connected with the pincers oval head crotch of negative winding stem towards the jaw inboard, pincers negative winding stem oval head crotch top and lower jaw crotch portion offset, at the contact point place, oval head crotch radian is less than the radian of lower jaw crotch portion.

Described jaw center 01 is preferably eccentric structure with bearing pin two centers of circle 02.

Described upper jaw inboard can have small one and large one two sections circular arcs, and wherein the circular arc of great circle segmental arc and lower jaw inboard is relative and establish, and encloses the jaw that contacts with outer surface of pipe fittings, is provided with enough the gap for the jaw distortion between little arc section and the lower jaw.

The beneficial effects of the utility model are as follows:

On of the present utility model, the lower jaw uneven thickness, employing with middle certain for the thinnest, then to the two ends structure of thickening gradually. when this pliers is just held pipe fitting tightly, on, lower jaw deformable under pincers handle displacement effect is shunk, the realization self-locking is held tightly automatically, allow the jaw inner surface contact fully with outer surface of pipe fittings, increased contact area, thereby also increased frictional force. go up simultaneously, lower jaw is not contacting near the pincers shank portion, but leave enough gap values for its distortion, can realize holding tightly fully in real time pipe fitting, can not skid. arrive the distance in bearing pin two centers of circle 02 during use much larger than contact point to the distance in bearing pin two centers of circle with the force, use very laborsaving. the jaw structural design gets also very compact in addition, clamp the certain angle that has between handle center line and the horizontal line, be designed beautifully rationally, also be convenient to workman's operation.

The utility model can not damage outer surface of pipe fittings in use, has easy to operate, quick, simple in structure, economical and practical advantage, can be used for the pipe fitting screw thread tighten or pine is unloaded.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is a cross-sectional view of the present utility model.

Fig. 3 is the structural representation of upper jaw.

Fig. 4 is the cross-sectional view of upper jaw.

Fig. 5 is the structural representation of lower jaw.

Fig. 6 is the cross-sectional view of lower jaw.

Fig. 7 is the structural representation of pincers handle.

Fig. 8 is the structural representation of Fig. 7 A-A section.

Fig. 9 is handle and the structural representation of filling out wedge.

Figure 10 is the structural representation at pincers handle and lower jaw contact point place.

Reference numeral: 1-lower jaw, 2-bearing pin one, 3-upper jaw, 4-gap, 5-contact point, 6-bearing pin two, 7-pincers handle, 7.1-oval head crotch, 7.2-pin-and-hole, 8-handle, 9-fill out wedge; 01-jaw center, 02-bearing pin two centers of circle; NN '-upper jaw thinnest part, MM '-lower jaw thinnest part.

The specific embodiment

Embodiment is referring to Fig. 1, shown in Figure 2, this Friction spanner for pipe, comprise upper jaw 3, lower jaw 1, pincers handle 7, handle 8, fill out wedge 9, and with upper jaw and the hinged hinged bearing pin two of bearing pin one, upper jaw and pincers handle of lower jaw, it is thin that upper jaw and lower jaw are the middle part, to the two ends arcuate structure of thickening gradually.Jaw center 01 is an eccentric structure with bearing pin two centers of circle 02.The position of upper jaw thinnest part NN ' is with respect to jaw center 01 deflection and the hinged end of lower jaw; The position of lower jaw thinnest part MM ' and the position of NN ' are about jaw center 01 symmetry.L1 is the distance in contact point 5 places and bearing pin two centers of circle 02, and L2 is with the distance of force F to bearing pin two centers of circle 02, and L2 is far longer than L1.Bearing pin two is very near to the distance at contact point 5 places, can make the jaw overall construction design very compact.

Referring to Fig. 1, Fig. 3, shown in Figure 4, upper jaw 3 one ends are hinged by hinge 1 and lower jaw, the other end is hinged with the pincers handle by bearing pin 26, the upper jaw inboard has small one and large one two sections circular arcs, wherein the circular arc of great circle segmental arc and lower jaw inboard is relative and establish, and enclose the jaw that contacts with outer surface of pipe fittings, be provided with the gap 4 that enough is out of shape between little arc section and the lower jaw for jaw.

Referring to Fig. 1, Fig. 5, shown in Figure 6, described lower jaw 1 is a crotch that is combined by a bit of elliptic arc and a bit of circular arc with the part that the pincers negative winding stem contacts, and is connected with the oval head crotch 7.1 of pincers negative winding stem towards the jaw inboard.

Referring to Fig. 7, shown in Figure 8, pincers handle 7 heads have oval head crotch 7.1 and pin-and-hole 7.2 successively, and the pincers handle tail is fixedlyed connected with handle 8, and pincers handle and handle are to adopt the interference hot charging to form.

Referring to shown in Figure 9, handle end is equipped with fills out wedge 9.On the handle and to fill out wedge also be to adopt the interference hot charging to form, strength character can meet the demands fully.

Referring to shown in Figure 10, pincers negative winding stem oval head crotch top and lower jaw crotch portion offset, and at the contact point place, oval head crotch radian is less than the radian of lower jaw crotch portion.

The course of work of the present utility model is as follows:

When being subjected to power F on the pincers handle, lower jaw will be subjected to the combined deformation of stretching upwards and the bending in circle, and upper jaw also can be subjected to the combined deformation of downward stretching and the bending in circle simultaneously, and upper and lower jaw acts on simultaneously, realizes the function of holding tightly to pipe fitting.

The above only is a preferred embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; as adopt and change the linear interpolation point; with two or more linearity and non-linear interpolation method; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.

Claims

1. Friction spanner for pipe, comprise upper jaw (3), lower jaw (1), pincers handle (7), handle (8), and with jaw and the hinged bearing pin of pincers handle, it is characterized in that: it is thin that upper jaw and lower jaw are the middle part, to the two ends arcuate structure of thickening gradually, the position of upper jaw thinnest part NN ' is with respect to jaw center 01 deflection and the hinged end of lower jaw, and the position of lower jaw thinnest part MM ' and the position of NN ' are about jaw center 01 symmetry; Pincers handle (7) head has oval head crotch (7.1) and pin-and-hole (7.2) successively, and the pincers handle tail is fixedlyed connected with handle (8);

Described upper jaw (3) one ends are hinged by bearing pin one (2) and lower jaw, the other end is hinged with the pincers handle by bearing pin two (6), upper jaw is enclosed the jaw that contacts with outer surface of pipe fittings with the circular arc of lower jaw inboard, and upper jaw and lower jaw are having the gap (4) that enough is out of shape for jaw near the pincers shank portion;

Described lower jaw (1) is a crotch that is combined by a bit of elliptic arc and a bit of circular arc with the part that the pincers negative winding stem contacts, and be connected with the pincers oval head crotch (7.1) of negative winding stem towards the jaw inboard, pincers negative winding stem oval head crotch top and lower jaw crotch portion offset, at the contact point place, oval head crotch radian is less than the radian of lower jaw crotch portion.

2. Friction spanner for pipe according to claim 1 is characterized in that: described jaw center 01 is preferably eccentric structure with bearing pin two centers of circle 02.

3. Friction spanner for pipe according to claim 1 and 2, it is characterized in that: described upper jaw inboard has small one and large one two sections circular arcs, wherein the circular arc of great circle segmental arc and lower jaw inboard is relative and establish, and enclose the jaw that contacts with outer surface of pipe fittings, be provided with the gap (4) that enough is out of shape between little arc section and the lower jaw for jaw.