CN1075412C

CN1075412C - Small-diameter screw-hole tapping device

Info

Publication number: CN1075412C
Application number: CN97123273A
Authority: CN
Inventors: 黎燕
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-12-22
Filing date: 1997-12-22
Publication date: 2001-11-28
Anticipated expiration: 2017-12-22
Also published as: CN1220928A

Abstract

The present invention discloses a tapping device with a small diameter screw hole, which is provided with a driving shaft in a step sleeve shape and a driven shaft with a linking pin, which is positioned and embedded through a bearing, a ratchet wheel and a shifting fork, wherein a reset spring mechanism composed of a spring, a spring seat and a push beam is arranged on the surface of the driven shaft. The centers of rolling beads in the bearing are fixed by the shifting fork on a positioning sleeve of the shifting fork, and the linking pin is matched with a clamping groove and the ratchet wheel on the driving shaft so as to realize the homodromous rotation and the reversal rotation of the driving shaft and the driven shaft. The tapping work under the condition of tap positive rotation and the workpiece exiting work under the condition of automatic reverse rotation are completed. The present invention has the characteristics of simple structure, convenient operation, high tapping speed and wide applicability.

Description

Small-diameter screw-hole tapping device

The present invention relates to the device of screw thread cutting, particularly adopt the automatically quick rotating chasing bar in drilling machine manual operations processing small-diameter thread hole.

Screwed hole on the processing small batch product has manual processing and machinery two kinds of methods of processing automatically.If adopt machinery processing automatically, then need complicated electrical equipment control mechanism or mechanical device, so the equipment investment expense be higher.Simultaneously, if do not adopt automatic feeding device and precision positioning jig, its process velocity is not high yet, also very easily produces card awl, disconnected awl phenomenon.Processing small batch minor diameter screwed hole is generally taked manual method at present, its processing time consuming effort, inefficiency, processing cost height.

The purpose of this invention is to provide a kind of simple in structure, easy to operate, the automatic chasing bar of rotating, it is applicable to manual operations on drilling machine, the small-diameter screw-hole on the processing small batch product to improve process velocity, cuts down finished cost.

The technical scheme that realizes the object of the invention is: a kind of small-diameter screw-hole tapping device, and it has a driving shaft that is step sleeve type, and interior setting-in one top has the driven shaft of set bar, and the middle part matched in clearance of this driven shaft is equipped with ratchet and shift fork positioning sleeve; Between ratchet and driving shaft, be provided with the bearing that inside and outside circle is respectively interference fit; The shift fork of shift fork positioning sleeve upper end stretches between the rolling element of bearing, and the top of its positioning sleeve is provided with lock sleeve and driving shaft thread connection, and the lateral fixation of positioning sleeve has backstay to extend in the sliding tray of fixing slide carriage; On driven shaft, be provided with the back-moving spring mechanism that constitutes by spring, spring base and the decorative pearl on top of an official cap in its driving shaft.

Technical scheme of the present invention also comprises: be connected with at the lower end of driven shaft screw thread and adjust cover, be provided with the friction plate and the rubber cushion of center band tap holder patchhole in the cover.

The present invention compared with prior art has following advantage:

1, utilizes the movement relation of rolling bearing Internal and external cycle dexterously, made the rotating structure very simple, durable.

2, Internal and external cycle frictionally transmission, the size of its driving torque is relevant with the normal pressure that is applied between ball and the inside and outside circle, promptly exerts oneself when big as the operator, and the moment of torsion of transmission is big, and vice versa.Because this transmission allows servo system " to skid ", thereby the card awl that causes, disconnected awl phenomenon have been avoided reversing by force.

3, can use simple and easy drilling machine, not need complicated detent mechanism, make tapping simple to operate, can raise labour productivity significantly, cut down finished cost.

Fig. 1 is small-diameter screw-hole tapping device overall structure figure;

Fig. 2 is the A-A profile of Fig. 1.

The present invention is further elaborated below in conjunction with drawings and Examples:

Provide as accompanying drawing, this chasing bar has the driving shaft 1 of establishing shoulder hole in one, and its endoporus bottom interference fit is installed ball bearing 8, and interference fit is installed ratchet 7 in the bearing 8.Driven shaft 5 is installed on the shaft core position of driving shaft, does matched in clearance with driving shaft top endoporus and ratchet axis hole.Set bar 6 has been crossed on the top of axle 5, and this set bar upwards can cooperate with the draw-in groove 16 on the driving shaft, makes driven shaft and driving shaft with turning to rotation; Can mesh with ratchet 7 downwards, driven shaft is rotated together with ratchet.At the spring 2, spring base 3 and the decorative pearl on top of an official cap 4 that in driving shaft 1 endoporus, are provided with pressuring action above the driven shaft 5.In the below of ratchet 7 and bearing 8 shift fork positioning sleeve 9 is installed with driven shaft 5 matched in clearance, the shift fork of its upper end stretches between the ball of bearing 8.The top of this positioning sleeve is provided with a lock sleeve 10 thread connection in the lower end of driving shaft 1 endoporus.Lateral fixation at positioning sleeve has a horizontal backstay 11, and the end of this backstay places in the vertical sliding tray of fixing slide carriage 12.

In accompanying drawing embodiment, provide one and had the dop structure of deciding moment of torsion and unsteady aligning function.It is to adjust cover 15 in the lower end of driven shaft 5 thread connection one, adjust be provided with in the cover one with the friction plate 14 of axle 5 lower surface frictional fit, rubber cushion 13 is installed below the friction plate 14.Be provided with the tap holder patchhole at the center of friction plate and rubber cushion.By a rolling bearing socket,, make bearing enclose and ball constitute a planet circular system between driving shaft of this chasing bar and the driven shaft by the center fixation of shift fork with ball in the bearing.When rotated in the same way by driving shaft and drill press spindle the outer ring, bearing inner race drove by the frictional force of ball, does the rotation opposite with the outer ring.When the screw tap contact workpiece on the driven shaft, reaction force upwards pushes away driven shaft, and the bearing pin on the driven shaft is combined with driving shaft, and it is identical that driven shaft and driving shaft turn to, the beginning tapping; When tapping was finished, driving shaft was upwards carried, and spring presses driven shaft to contact with the ratchet of counter-rotating, and workpiece is withdrawed from the screw tap counter-rotating.The feed compensation of screw tap provides by the friction-type chuck.

The method of operating of this device is: 1, SBR.Drilling machine is started, and driving shaft is rotated in the forward, and driven shaft is done reverse rotation; 2, duty.Drill press spindle moves downward, the screw tap contact workpiece, and driven shaft is rotated in the forward, and carries out tapping; 3, end-of-job.Carry on the drill press spindle, screw tap is return in the driven shaft counter-rotating, enters next work period.

Claims

1, a kind of small-diameter screw-hole tapping device is characterized in that: it has a driving shaft (1) that is step sleeve type, and interior setting-in one top has the driven shaft (5) of set bar (6), and the middle part matched in clearance of axle (5) is equipped with ratchet (7) and shift fork positioning sleeve (9); Between ratchet (7) and driving shaft (1), be provided with the bearing (8) that inside and outside circle is respectively interference fit; The shift fork of shift fork positioning sleeve (9) upper end stretches between the rolling element of bearing (8), and the top of its positioning sleeve is provided with lock sleeve (10) and driving shaft (1) thread connection, and the lateral fixation of positioning sleeve has backstay (11) to extend in the sliding tray of fixing slide carriage (12); On driven shaft (5), be provided with the back-moving spring mechanism that constitutes by spring (2), spring base (3) and the decorative pearl on top of an official cap (4) in its driving shaft (1).

2, small-diameter screw-hole tapping device according to claim 1 is characterized in that: the lower end screw thread at driven shaft (5) is connected with adjustment cover (15), is provided with the friction plate (14) and the rubber cushion (13) of center band tap holder patchhole in this adjustment cover.