CN202579689U

CN202579689U - Hydraulic close fit bolt

Info

Publication number: CN202579689U
Application number: CN 201120307459
Authority: CN
Inventors: 梁辉; 王鸿雁; 张英
Original assignee: SHANGHAI BENAN INDUSTRIAL DEVELOPMENT CO LTD
Current assignee: SHANGHAI BENAN INDUSTRIAL DEVELOPMENT CO LTD
Priority date: 2011-08-20
Filing date: 2011-08-20
Publication date: 2012-12-05
Anticipated expiration: 2021-08-20

Abstract

The utility model discloses a hydraulic close fit bolt, comprising a hydraulic close fit bolt body provided with inner taper threads and a spiral oil groove. The hydraulic close fit bolt body is disposed in a coupler; a taper sleeve is disposed between the middle part of the hydraulic close fit bolt body and a bolt hole of the coupler; each of the two ends of the hydraulic close fit bolt is provided with a nut; and blast prevention devices are disposed on the outside of the nuts. The hydraulic close fit bolt is reasonable in structure and is scientific in working mode, is easy to install and dismount and thus shortens a maintenance period, is reusable and thus saves cost, and demands less for work sites.

Description

The hydraulic pressure fitting-up bolt

Technical field

The utility model relates to a kind of novel bolt.

Background technique

Existing plain bolt is connecting large-scale coupling, particularly during the Turbo-generator Set coupling; Because of having the gap between bolt and the bolt hole; Only depend on the frictional force transmitting torque, the moment of torsion of transmission is little, can not produce desirable stable being rigidly connected; The phenomenon that bolt hole plucking or bolt bite very easily occur even kill, the installing/dismounting process wastes time and energy.

The model utility content

It is a kind of rational in infrastructure that the purpose of the utility model is to provide; The working method science, the hydraulic pressure fitting-up bolt of easy installation and removal, the phenomenon that this model utility has fundamentally solved bolt hole plucking or bolt bite even killed; And the ability of transmitting torque is far longer than conventional bolt; Can reuse, the installing/dismounting process rapidly and efficiently can shorten the repair cycle greatly.

The technical solution of the utility model is following:

A kind of hydraulic pressure fitting-up bolt comprises bolt, tapered sleeve, nut, dust guard.The bolt middle part is the screw rod that has tapering; Along the circumferential direction have two annular oil grooves on the screw rod, have a single-screw shape oil groove vertically and link to each other with two annular oil grooves, the bolt two ends have the outside thread that cooperates with nut; The two ends end face has shoulder hole; From end face be successively inward: the oilhole that conical internal thread and the thin extreme direction of bolt screw rod have, the annular oil groove bottom of bolt screw rod radially also has oilhole, and two oilholes communicate; Tapered sleeve is inner conical drogue and matches with the conical screw at bolt middle part; Nut is installed on the outside thread of bolt two ends; Dust guard is made up of cover plate, lock sheet and lock screw, is installed in the nut outside.

The tooth form angle of said conical screw hole is 60 °, and tapering is 1: 3,1: 4 or 1: 5.

The width of said annular oil groove is greater than the width of single-screw type oil groove.

The width of said annular oil groove is greater than the width of radial direction oil hole.

The utility model is rational in infrastructure, has broken through to be Spielpassung between conventional bolt and the bolt hole, only depends on the narrow limitation of friction torque transmitting torque; The working method science; Also use the hydraulic elongator tensile bolt through the location tapered sleeve; Because of the stressed expansion of tapering effect tapered sleeve, make between tapered sleeve and the coupling bolt hole to become interference fit by Spielpassung, thereby by most (more than the 90%) moments of torsion of the shear transfer of bolt and tapered sleeve; Nut and pretension are installed at the bolt two ends then, are made the frictional force between nut and flange plate transmit remainder moment of torsion (4-10%); Easy installation and removal is efficient, and the expansion of tapered sleeve and bolt pretension during installation are to accomplish through accurately controlled hydraulic elongator; During dismounting; Earlier discharge bolt pretightening, discharge the expansive force of tapered sleeve then through creosoting process, the bolt tapered sleeve is separated with hydraulic elongator; Dust guard can effectively be safeguarded the cleaning inside of tapered thread.

Need be equipped with oil hydraulic pump, extreme pressure hose, the ultra-high pressure quick coupling of band hydralic pressure gauge during to hydraulic elongator pressurization and creosoting process release tapered sleeve.The kit that the utility model needs is not in the utility model content.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 3 is the structural representation of the utility model dust guard;

Fig. 2 is the left view of Fig. 3;

Fig. 4 is the half sectional view of the utility model bolt.

Among the figure: 1 bolt, 2 tapered sleeves, 3 nuts, 4 dust guards, 4a cover plate, 4b lock sheet, 4c cover screw, 5 tapered thread holes, 7 axial oilholes, 8 radial direction oil hole, 9 single-screw shape oil grooves, 10, conical screw, 11 annular oil grooves.

Embodiment

Further specify the utility model below in conjunction with accompanying drawing and specific embodiment.

A kind of hydraulic pressure fitting-up bolt comprises bolt 1, tapered sleeve 2, nut 3, dust guard 4.

Bolt 1 two ends end face has tapered thread hole 5; Be axial oilhole 7 inward, bolt 1 intermediate portion is a conical screw 10, along the circumferential direction has annular oil groove 11 on the conical screw 10; Have single-screw shape oil groove 9 vertically; Single-screw shape oil groove 9 communicates with annular oil groove 11, and annular oil groove 11 bottoms, conical screw 10 thin end place have radial direction oil hole 8, and radial direction oil hole 8 communicates with axial oilhole 9.The tapering of conical screw hole 5 is 1: 3 in the present embodiment, 60 ° at tooth form angle, pitch 2.

Tapered sleeve 2 is installed in conical screw 10 outsides, and the tapering of tapered sleeve 2 inner conical surfaces is identical with the tapering of conical screw 10.

Nut 3 is installed on the outside thread at bolt 1 two ends.

Dust guard 4 is made up of cover plate 4a, lock sheet 4b, lock screw 4c; Cover plate 4a, lock sheet 4b are fixed on nut 3 outsides, play dustproof effect.

Claims

1. a hydraulic pressure fitting-up bolt comprises bolt, tapered sleeve, nut, dust guard; The bolt middle part is the screw rod that has tapering; Along the circumferential direction have two annular oil grooves on the screw rod; Have a single-screw shape oil groove vertically and link to each other with two annular oil grooves, the bolt two ends have the outside thread that cooperates with nut, and the two ends end face has shoulder hole; From end face be successively inward: the radial direction oil hole of the oilhole of conical internal thread, the thin extreme direction of bolt screw rod and the annular oil groove of bolt screw rod bottom, two oilholes communicate; Tapered sleeve is inner conical drogue and matches with the conical screw at bolt middle part; Nut is installed on the outside thread of bolt two ends; Dust guard is made up of cover plate, lock sheet and lock screw, is installed in the nut outside.