CN203742473U

CN203742473U - Thread buckling structure for non-excavation drill stem

Info

Publication number: CN203742473U
Application number: CN201320808643.XU
Authority: CN
Inventors: 鲍洪锋
Original assignee: WUXI DOUBLE HORSE DRILLING TOOLS Co Ltd
Current assignee: WUXI DOUBLE HORSE DRILLING TOOLS Co Ltd
Priority date: 2013-12-10
Filing date: 2013-12-10
Publication date: 2014-07-30
Anticipated expiration: 2023-12-10

Abstract

The utility model discloses a thread buckling structure for a non-excavation drill stem, which includes a male buckle and a female buckle, wherein a male thread is formed in the male buckle, a female buckle matched with the male buckle is arranged on the female buckle; a male buckle stress relieving groove positioned at the root of the male thread is arranged on the male buckle; a female buckle stress relieving groove positioned at the root of the female thread is arranged on the female buckle, and is opposite to the male buckle stress relieving groove. The male buckle stress relieving groove and the female buckle stress relieving groove are additionally arranged to effectively release the comprehensive stress generated during the operation of the non-excavation drill stem and further avoid cracking of the roots of the threads due to stress concentration, so that the service life of the non-excavation drill stem can be effectively prolonged; meanwhile, the thread buckling structure provided by the utility model can increase the curvature at the joint and effectively reduces the construction difficulty.

Description

A kind of screw buckle structure of non-excavation drilling rod

Technical field

The utility model relates to a kind of screw buckle structure of non-excavation drilling rod.

Background technology

High speed development along with China's economic, the input that country builds Foundation Design increases, non-excavation drilling tool is being brought into play irreplaceable effect in Foundation Design, non-excavation drilling rod is as the crucial carrier of transferring power, bearing periodically and the complicated combined stress such as drawing, press, turning round, not only requiring has enough hardness, also will have enough toughness and fatigue strength etc. simultaneously.As shown in Figures 1 and 2, for existing non-excavation drill rod thread buckle structure, adopt the non-excavation drilling rod construction of this kind of screw buckle structure, particularly carry out short and dark while closely passing through engineering, non-excavation drilling rod becomes less because of bend radius, connection of thread is periodically drawn, is pressed, is turned round the comprehensive function of alternating stresses especially, pin thread thread root, box thread root are often because this combined stress produces tiny fatigue crack, along with increasing of non-excavation drilling rod frequency of usage, crackle amplifies rapidly, finally shows as a kind of brittle fracture.

Utility model content

The purpose of this utility model is for the problems referred to above, and a kind of screw buckle structure of non-excavation drilling rod is provided, to solve pin thread thread root, the box thread root easy fracture of original non-excavation drilling rod, the problem that application life is short.

The purpose of this utility model is to be achieved through the following technical solutions:

A kind of screw buckle structure of non-excavation drilling rod, comprise pin thread, box, on described pin thread, be provided with male thread, on described box, be provided with the box thread matching with male thread, on described pin thread, be positioned at male thread root and be provided with pin thread stress-relief groove, on described box, be positioned at box thread root and be provided with box stress-relief groove, described pin thread stress-relief groove and box stress-relief groove positioned opposite.

Preferably, on described male thread, box thread, be provided with nitration case, strengthen male thread, box thread case hardness and abrasion resistance.

Preferably, the thickness of described nitration case is 0.10～0.15mm, and the thickness of nitration case is arranged within the scope of this, can make male thread, box thread have best abrasion resistance, simultaneously also can be because of the too thick toughness that affects male thread, box thread top layer of nitration case.

Preferably, on described pin thread, the inclined-plane of male thread is provided with oil storage gap, described oil storage is provided with thread compound in gap, has increased oil storage space, the effect conical surface while having reduced upper button, make drilling rod when screwing, lubricated sufficient, during upper button, can produce certain pressure, during shackle, can reduce constructor's labour intensity.

The beneficial effects of the utility model are, the screw buckle structure of described non-excavation drilling rod is by setting up pin thread stress-relief groove and box stress-relief groove, the combined stress that non-excavation drilling rod is produced when work is effectively discharged, being unlikely to produce stress at thread root concentrates and ftractures, can effectively extend the application life of non-excavation drilling rod, meanwhile, adopt screw buckle structure of the present utility model, can increase the resistant to bending ability of non-excavation drilling rod, effectively reduce difficulty of construction, in addition, oil storage gap is set on the inclined-plane by male thread on pin thread, and in oil storage gap, thread compound is set, thereby when male thread and box thread are screwed, fully lubricated, upper button is simple, easily.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the screw buckle structure of existing non-excavation drilling rod;

Fig. 2 is that the screw buckle structure of the existing non-excavation drilling rod shown in Fig. 1 is at the enlarged drawing at A place;

Fig. 3 is the schematic diagram of the screw buckle structure of a kind of non-excavation drilling rod of the utility model;

Fig. 4 is that the screw buckle structure of a kind of non-excavation drilling rod shown in Fig. 3 is at the enlarged drawing at B place.

In figure:

1, box; 2, pin thread; 3, box thread; 4, male thread; 5, box stress-relief groove; 6, pin thread stress-relief groove; 7, thread compound.

The specific embodiment

Below in conjunction with accompanying drawing and by the specific embodiment, further illustrate the technical solution of the utility model.

Please refer to shown in Fig. 3 and Fig. 4, in the present embodiment, a kind of screw buckle structure of non-excavation drilling rod, comprise pin thread 2, box 1, on described pin thread 2, be provided with male thread 4, on described box 1, be provided with the box thread 3 matching with male thread 4, described box thread 3, on male thread 4, be provided with nitration case, the thickness of described nitration case is 0.12mm, on described pin thread 2, be positioned at male thread 4 roots and be provided with pin thread stress-relief groove 6, and on pin thread 2, the inclined-plane of male thread 4 is provided with oil storage gap, described oil storage is provided with thread compound 7 in gap, on described box 1, be positioned at box thread 3 roots and be provided with box stress-relief groove 5.

By pin thread stress-relief groove 6, box stress-relief groove 5 are set, make stress can access release, effectively extended the application life of non-excavation drilling rod, and the inclined-plane of male thread 4 arranges oil storage gap on pin thread 2, and thread compound 7 is set, while making to screw, fully lubricated, upper button is simple.

By nitration case being set on male thread 4, box thread 3, and the THICKNESS CONTROL of nitration case is between 0.10～0.15mm, make male thread 4, box thread 3 there is best abrasion resistance, simultaneously can be because of the too thick toughness that affects male thread 4, box thread 3 top layers of nitration case yet; The male thread 4 of non-excavation drilling rod, box thread 3 are before nitrogenize, to the processing of sandblasting of male thread 4, box thread 3 surfaces, remove the tiny burr on male thread 4, box thread 3 surfaces, male thread 4, box thread 3 surfaces have formed even tiny male and fomale(M&F) simultaneously, thread compound 7 is stored, thereby better lubricated the flank of male thread 4 with box thread 3, effectively prevented the direct contact of flank.

Above embodiment has just set forth basic principle of the present utility model and characteristic; the utility model is not limited by above-described embodiment; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various variations and change, and these variations and change all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. the screw buckle structure of a non-excavation drilling rod, comprise pin thread, box, on described pin thread, be provided with male thread, on described box, be provided with the box thread matching with male thread, it is characterized in that: on described pin thread, be positioned at male thread root and be provided with pin thread stress-relief groove, on described box, be positioned at box thread root and be provided with box stress-relief groove, described pin thread stress-relief groove and box stress-relief groove positioned opposite, described male thread, on box thread, be provided with nitration case, on described pin thread, the inclined-plane of male thread is provided with oil storage gap, described oil storage is provided with thread compound in gap.

2. the screw buckle structure of a kind of non-excavation drilling rod according to claim 1, is characterized in that: the thickness of described nitration case is 0.10～0.15mm.