CN102454592B

CN102454592B - Connecting rod

Info

Publication number: CN102454592B
Application number: CN201010523829.1A
Authority: CN
Inventors: 黄顺俊
Original assignee: Sichuan Honghua Petroleum Equipment Co Ltd
Current assignee: Sichuan Honghua Petroleum Equipment Co Ltd
Priority date: 2010-10-29
Filing date: 2010-10-29
Publication date: 2015-04-01
Anticipated expiration: 2030-10-29
Also published as: CN102454592A

Abstract

The invention discloses a connecting rod which comprises a connecting rod body (1), and a copper sheathing (2), wherein the copper sheathing (2) is arranged in a small head end of the connecting rod body (1), and the small head end is provided with a detachable small head end cover (3a). The connecting rod provided by the invention has the advantages of simple structure, and by using the detachable small head end cover, the copper sheathing is convenient to replace.

Description

A kind of connecting rod

Technical field

The invention belongs to petroleum and natural gas drilling equipment field, relate to a kind of connecting rod concretely.

Background technique

Drilling mud pump is described as " heart " of rig, gets out the rig that first has a commercial value and uses drilling mud pump, had the history of more than 100 year from the whole world.This 100 for many years, the slurry pump of drilling machine with commercial value is all the triplex pumps adopted.Nearest more than 10 years, people start constantly to explore exploitation five cylinder pump, because five cylinder pumps are compared with triplex pump, have reduce discharge medium pressure surge, expand range of flow, eliminate traditional shock absorber for output, improve the life-span of discharging fluid cylinder, the volume of drilling pump can also be made to reduce light simultaneously, the advantages such as weight saving, but all because five cylinder pump manufacture maintenances are very difficult, wherein dismantle and assemble the critical components such as the connecting rod small-end bearing of five cylinder pumps to make user very difficult to be exactly an example, to cause there be limited evidence currently of to adopt five cylinder pumps.

The connecting rod small end of usual use connecting rod small-end bearing is all be designed to overall circle, and connecting rod small-end bearing cylindrical and connecting rod small-end bearing bore design are all the very large interference fit adopted, in order to both ensure very large magnitude of interference, rod deformation and copper sheathing in assembly process is not made again to be weighed wounded, the assembling connecting rod small-end bearing that manufactory often adopts is all the very low temperature shrinkage of connecting rod small-end bearing cylindrical diminished, then load in connecting rod small end hole, be namely called that shrinkage method is assembled.Connecting rod small-end bearing after dismounting wearing and tearing can not adopt shrinkage method again, only has and adopts powerful extrusion connecting rod small-end bearing, need very large press machine and necessary special tooling.The connecting rod small-end bearing of five cylinder slurry pump is a vital part, is again the part that a price is very low, and is to be designed and manufactured into a standard piece.Situ of drilling well is in order to ensure the excellent usability of slurry pump, the connecting rod small-end bearing that timely replacing gap increases has become inexorable trend, this is for the frock not only having lacked shrinkage condition at situ of drilling well but also lacked press machine and necessity, after connecting rod small-end bearing wearing clearance increases, dismantle and assemble connecting rod small-end bearing just very difficult, do not solve the difficulty of this dismounting and assembling connecting rod small-end bearing, user is with regard to use five cylinder pump beyond affordability.

Summary of the invention

The object of this invention is to provide the connecting rod that a kind of structure is simple, be convenient to change copper sheathing in connecting rod small end end.

Technological scheme of the present invention is as follows:

A kind of connecting rod, comprise con-rod only, copper sheathing, described copper sheathing is arranged in the little head end of described con-rod only, and described little head end has dismountable microcephaly's end cap.

Adopt said structure key to be: connecting rod small end end has been designed to two-part composition, the replacing of the design copper sheathing of dismountable microcephaly's end cap is very easy to, and avoids traditional copper sheathing installing/dismounting Problems existing in background technique.

Described microcephaly's end cap is connected with microcephaly's end group body of described little head end.

Junction plane between described microcephaly's end cap and described microcephaly's end group body is toothed surface.

Junction plane is toothed surface, increases the stress surface of junction plane and friction factor, can reduce the diameter of screw, save the space of little head end, namely can meet microcephaly's end group body and microcephaly's end cap can separate, and does not increase again original little head end size.Simultaneously toothed surface also has the function that microcephaly's end group body and microcephaly's end cap are accurately located, and can cancel traditional locating stud location, reduce the processing of two parts and positioning hole.

Described microcephaly's end cap is provided with copper sheathing positioning screwn.

Copper sheathing positioning screwn plays axis and the sense of rotation positioning action of copper sheathing

Described toothed surface wire cutting method obtains, and the tooth pitch of toothed surface is 10mm ~ 12.5mm, tooth depth 3mm ~ 4mm, and tooth top and tooth root are R2mm ~ R3mm orthodromes, and Linear cut mould filament diameter is 0.15 mm ~ 0.18mm.

The tooth pitch of preferred toothed surface is 12.5mm, tooth depth 4mm, and tooth top and tooth root are R3mm orthodromes, and Linear cut mould filament diameter is 0.165mm.

Described microcephaly's end cap and described microcephaly's end group body are connected by screw.

Beneficial effect: simple, the dismountable microcephaly's end cap of structure of the present invention facilitates the replacing of copper sheathing.

Accompanying drawing explanation

Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:

Fig. 1 structural representation of the present invention;

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

Fig. 3 is the worm's eye view of Fig. 1;

Fig. 4 is the A place enlarged view of Fig. 3;

Fig. 5 is the right elevation of Fig. 3.

Embodiment

As shown in Fig. 1,2,3,4,5: a kind of connecting rod, comprises con-rod only 1, copper sheathing 2, described copper sheathing 2 is arranged in the little head end of described con-rod only 1, and described little head end has dismountable microcephaly's end cap 3a.

Described microcephaly's end cap 3a is fixed on microcephaly's end group body 3b of described little head end by screw 4.

Junction plane between described microcephaly's end cap 3a and described microcephaly's end group body 3b is toothed surface.

Described microcephaly's end cap 3a is provided with copper sheathing positioning screwn 5.

Described toothed surface wire cutting method obtains, and the tooth pitch of toothed surface is 10mm ~ 12.5mm, tooth depth 3mm ~ 4mm, and tooth top and tooth root are R2mm ~ R3mm orthodromes, and Linear cut mould filament diameter is 0.15mm ~ 0.18mm.

The tooth pitch of preferred toothed surface is 12.5mm, tooth depth 4mm, and tooth top and tooth root are R3mm orthodromes, and Linear cut mould filament diameter is 0.165mm.。

Wherein: the screw on little head end must firm screw tap tapping with executing, and has extraordinary auto-lock function, do not need traditional part adding spring washer, add the anti-thread looseness that steel wire etc. takes up room, directly Linear cut just can satisfy the demand, manufacturability maturation is easy to process.

Claims

1. a connecting rod, comprise con-rod only (1), copper sheathing (2), described copper sheathing (2) is arranged in the little head end of described con-rod only (1), it is characterized in that: described little head end has dismountable microcephaly's end cap (3a); Described microcephaly's end cap (3a) is connected by screw (4) with microcephaly's end group body (3b), junction plane between described microcephaly's end cap (3a) and described microcephaly's end group body (3b) is toothed surface, described toothed surface wire cutting method obtains, the tooth pitch of toothed surface is 10mm ~ 12.5mm, tooth depth 3mm ~ 4mm, tooth top and tooth root are R2 mm ~ R3mm orthodromes, and Linear cut mould filament diameter is 0.15 mm ~ 0.18mm.

2. a kind of connecting rod according to claim 1, is characterized in that: described microcephaly's end cap (3a) is provided with copper sheathing positioning screwn (5).

3. a kind of connecting rod according to claim 1, is characterized in that: the tooth pitch of toothed surface is 12.5mm, tooth depth 4mm, and tooth top and tooth root are R3mm orthodromes, and Linear cut mould filament diameter is 0.165mm.