CN102454592A

CN102454592A - Connecting rod

Info

Publication number: CN102454592A
Application number: CN2010105238291A
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: 2012-05-16
Anticipated expiration: 2030-10-29
Also published as: CN102454592B

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

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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 rig " heart ", gets out first mouthful of rig with commercial value from the whole world and uses drilling mud pump to begin, and the history in more than 100 year has been arranged.This 100 for many years, the rig slurry pump with commercial value all is the triplex pumps that adopt.Nearest more than 10 years; People begin constantly to explore exploitation five cylinder pumps, compare with triplex pump because of five cylinder pumps, have the pressure surge, the expansion range of flow that have reduced to discharge medium, cancelled traditional shock absorber for output; Improved the life-span of discharging fluid cylinder; Simultaneously the volume of drilling pump is reduced gently, advantages such as weight saving, but all very difficult because of five cylinder pump manufacturings maintenance; The critical components such as connecting rod small-end bearing of wherein dismantling and assemble five cylinder pumps make the user very difficulty be exactly an example, cause there be limited evidence currently of to adopt five cylinder pumps.

Usually the connecting rod small end that uses connecting rod small-end bearing all is to be designed to whole circle; And connecting rod small-end bearing cylindrical and connecting rod small-end bearing bore design all are the very big interference fit that adopts; In order both to guarantee very big magnitude of interference, do not make again that rod deformation and copper sheathing are weighed wounded in the assembly process, the normal assembling connecting rod small-end bearing that adopts of manufactory all is that the connecting rod small-end bearing cylindrical is diminished with very low temperature shrinkage; Pack into then in the connecting rod small end hole, promptly be called the assembling of shrinkage method.Connecting rod small-end bearing after the dismounting wearing and tearing can not adopt the shrinkage method again, has only and adopts the powerful connecting rod small-end bearing that extrudes, and needs very big press machine and necessary special tooling.The connecting rod small-end bearing of five cylinder slurry pump is a vital part, is again a part that price is very low, and is to be designed and manufactured into a standard piece.Situ of drilling well is in order to guarantee the good usability of slurry pump; The connecting rod small-end bearing of in time changing the gap increase has become inexorable trend; This is for not only lacking the shrinkage condition but also lack press machine and the frock of necessity at situ of drilling well, and after the connecting rod small-end bearing wearing clearance increased, dismounting and assembling connecting rod small-end bearing were just very difficult; Do not solve the difficulty of this dismounting and assembling connecting rod small-end bearing, the user is with regard to use five cylinder pumps beyond affordability.

Summary of the invention

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

Technological scheme of the present invention is following:

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

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

Said microcephaly's end cap is connected with microcephaly's end group body of said little head end.

Junction plane between said microcephaly's end cap and the said microcephaly's end group body is a toothed surface.

Junction plane is a toothed surface, increases the stress surface and the friction factor of junction plane, can reduce the diameter of screw, and the space of practicing thrift little head end promptly can be satisfied microcephaly's end group body and microcephaly's end cap and can be separated, and does not increase original microcephaly again and holds size.Toothed surface also has the function of microcephaly's end group body and the accurate location of microcephaly's end cap simultaneously, can cancel the conventional positioning finger setting, reduces the processing of two parts and positioning hole.

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

The copper sheathing positioning screwn plays the axial and sense of rotation positioning action of copper sheathing

Said toothed surface obtains with wire cutting method, and the tooth pitch of toothed surface is 10mm～12.5mm, and tooth depth 3mm～4mm, tooth top and tooth root are R2～R3mm orthodromes, and line blanking punch filament diameter is 0.15 ~ 0.18mm.

The tooth pitch of preferred toothed surface is 12.5mm, and tooth depth 4mm, tooth top and tooth root are the R3mm orthodromes, and line blanking punch filament diameter is 0.165mm.

Said microcephaly's end cap is connected through screw with said microcephaly's end group body.

Beneficial effect: the present invention's microcephaly's end cap simple in structure, dismountable has made things convenient for the replacing of copper sheathing.

Description of drawings

The present invention will explain through example and with reference to the mode of accompanying drawing, 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

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

Said microcephaly's end cap 3a is fixed on microcephaly's end group body 3b of said little head end through screw 4.

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

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

Said toothed surface obtains with wire cutting method, and the tooth pitch of toothed surface is 10mm～12.5mm, and tooth depth 3mm～4mm, tooth top and tooth root are R2～R3mm orthodromes, and line blanking punch filament diameter is 0.15～0.18mm.

The tooth pitch of preferred toothed surface is 12.5mm, and tooth depth 4mm, tooth top and tooth root are the R3mm orthodromes, and line blanking punch filament diameter is 0.165mm.。

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

Claims

1. a connecting rod comprises con-rod only (1), copper sheathing (2), and said copper sheathing (2) is arranged in the little head end of said con-rod only (1), it is characterized in that: said little head end has dismountable microcephaly's end cap (3a).

2. a kind of connecting rod according to claim 1 is characterized in that: said microcephaly's end cap (3a) is connected with microcephaly's end group body (3b) of said little head end.

3. a kind of connecting rod according to claim 2 is characterized in that: the junction plane between said microcephaly's end cap (3a) and the said microcephaly's end group body (3b) is a toothed surface.

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

5. a kind of connecting rod according to claim 3; It is characterized in that: said toothed surface obtains with wire cutting method, and the tooth pitch of toothed surface is 10mm～12.5mm, tooth depth 3mm～4mm; Tooth top and tooth root are R2～R3mm orthodromes, and line blanking punch filament diameter is 0.15～0.18mm.

6. a kind of connecting rod according to claim 5 is characterized in that: the tooth pitch of toothed surface is 12.5mm, and tooth depth 4mm, tooth top and tooth root are the R3mm orthodromes, and line blanking punch filament diameter is 0.165mm.

7. a kind of connecting rod according to claim 2 is characterized in that: said microcephaly's end cap (3a) is connected through screw (4) with said microcephaly's end group body (3b).