CN2145363Y

CN2145363Y - Differential micrometer head

Info

Publication number: CN2145363Y
Application number: CN 92221872
Authority: CN
Inventors: 邹德春; 沈忙作; 杨亚涛
Original assignee: Institute of Optics and Electronics of CAS
Current assignee: Institute of Optics and Electronics of CAS
Priority date: 1992-12-14
Filing date: 1992-12-14
Publication date: 1993-11-03
Anticipated expiration: 2002-12-14

Abstract

The utility model relates to the improvement of a mini-distance measuring tool. The big stroke manipulating screws at the tail part of a distance measuring screw rod arranged in a guide sleeve are assembled with the rear part of a casing, which is arranged beyond the shaft sleeve and just can do axial movement. The front and back ends of an adjusting sleeve with unequal thread pitches screw threads is arranged simultaneously beyond the shaft sleeve. The screw threads at the back end of the adjusting sleeve are assembled with the casing by screws, and the screw threads at the front end of the adjusting sleeve are assembled with the guide sleeve by screws. The mini-difference between the casing and the guide sleeve produced by the screw pitch differences between the two ends screw threads of the mini-distance adjusting sleeve to realize the distance measuring for small stroke.

Description

Differential micrometer head

The utility model relates to a kind of distance element measurement of length instrument.

In new and high technology exploitation and have in the field of high-precision requirement, often to include monotechnicss test or system tests such as rectilinear motion, orientation adjustment and pitching adjustment.These motions all need to drive with micrometer head, and micro-stroke will be arranged.The micrometer head that uses is the range finding screw form that only adopts one pair of spiral to pay at present, and its precision is thicker, has only one of percentage millimeter.For obtaining the high-acruracy survey result, can only use different instruments or instrument continued operation, very inconvenient.

The purpose of this utility model is to provide a kind of micrometer head with two kinds of strokes of thickness for this reason, can finish the measurement of big stroke and two kinds of different accuracies of travel incognito journey simultaneously.

Micrometer head of the present utility model is the same with existing micrometer head, and having one equally can be along the axial range finding screw rod and the aft mounted manipulation spiral that makes it do and advance and retreat and move thereof of making linear advance and retreat of guideway.In micrometer head of the present utility model, what handle therewith that spiral matches is to be arranged at the overcoat that equally also can only make linear advance and retreat outside the guideway vertically.This overcoat again with also be arranged at outside the guideway and the threaded one end of all screwed microspur regulating sleeve in two ends cooperates as spiral, the other end screw thread of microspur regulating sleeve then cooperates as spiral with the corresponding site of guideway.What should emphasize is that the pitch of this microspur regulating sleeve two ends screw thread is unequal, changes the difference between its pitch, promptly can realize different micrometer precision.Because by above-mentioned connection matching relationship as can be seen, its advance and retreat motion can be manipulated and regulate to rotation range finding screw rod tail spiral directly routinely, and this advance and retreat can only be the coarse adjustment of big stroke.When rotation microspur regulating sleeve, regardless of rotational angle, the relative motion that the outer inner room that must make respectively the fixed guideway of the threads engaged that does not wait with its two ends pitch and can move vertically produces certain travel incognito journey, the distance of motion then depends on the pitch difference between this microspur regulating sleeve two ends screw thread.Different differentially can realize micrometer precision required and that wish with this.

Below structure of the present utility model is described, but scope of the present utility model is not limited only to this example with an example shown in the drawings.

The structure of Fig. 1 the utility model micrometer head

As shown in the figure, the range finding screw rod 1 of this routine micrometer head is arranged in and can axially makes the guideway 2 that linear advance and retreat are moved along it.The rear end of the overcoat 7 outside the tail end of range finding screw rod 1 is handled spiral 9 and is arranged at guideway 2 cooperates as spiral.Overcoat 7 via pins 10 match with axial location gathering sill on the guideway 2, overcoat 7 can not be rotated and can only advance and retreat vertically.Also be provided with the microspur regulating sleeve 3 that a rear and front end has the decreasing worm-pitch screw thread outside the guideway 2, its rear end screw thread cooperates as spiral with the front end of overcoat 7, and its front end screw thread cooperates as spiral with the corresponding site of guideway 2.For ease of the manipulation of microspur regulating sleeve 3, its outside through screw 4 fastening be connected with one with its operation change 5 of rotation synchronously.For ease of handling, range finding screw rod 1 afterbody equally also is connected with a coarse adjustment and handles change 8.Rotate change 8, the spiral 9 of range finding screw rod 1 afterbody can make this screw rod 1 do the coarse adjustment range finding of big stroke.Rotate change 5, drive microspur regulating sleeve 3 and rotate synchronously, the pitch difference of its two ends screw thread can make overcoat 7 drive that range finding screw rods 1 produce synchronously and the small axial difference of 2 of guideways, realizes the vernier range of little stroke.When this pitch difference is 0.05 millimeter, when the circumference of change 5 was carved with 50 lattices such as grade, change 5 revolutions moved 1 lattice, and the stroke of range finding screw rod 1 is 1 micron.This shows that the utility model micrometer head can realize the range finding requirement of stroke that varies in size simultaneously, and can reach very high micrometer precision, convenient and practical.

Claims

1, a kind of differential micrometer head, having can be along the axial range finding screw rod (1) of making linear advance and retreat of guideway (2), its tail end has manipulation spiral (9), it is characterized in that being provided with outside the guideway (2) one is subjected to positioning guiding structure (10) restriction can only make the axially overcoat (7) of advance and retreat motion equally, its rear end cooperates as spiral with the manipulation spiral (9) of range finding screw rod (1) tail end, its front end be arranged at guideway (2) equally outside and the rear end threaded engagement of microspur regulating sleeve (3) of two ends with screw thread of decreasing worm-pitch connect, the screw thread of microspur regulating sleeve (3) front end and the corresponding site on the guideway (2) are made threaded engagement.

2, micrometer head as claimed in claim 1 is characterized in that the difference of the pitch of said microspur regulating sleeve (3) rear and front end screw thread is 0.05 millimeter.

3, micrometer head as claimed in claim 1 or 2 is characterized in that handling change (5) through the fastening microspur that is connected with of connector (4) outside the said microspur regulating sleeve (3).

4, micrometer head as claimed in claim 1 is characterized in that the axial channel that cooperatively interact and the pin feature of said positioning guiding structure (10) for being provided with between overcoat (7) and guideway (2).