CN100359283C

CN100359283C - Horseshoe-shaped screw vernier deepness gauge

Info

Publication number: CN100359283C
Application number: CNB2005101374915A
Authority: CN
Inventors: 王贵华; 张新棋
Original assignee: Capital Aerospace Machinery Co Ltd
Current assignee: Capital Aerospace Machinery Co Ltd
Priority date: 2005-12-30
Filing date: 2005-12-30
Publication date: 2008-01-02
Anticipated expiration: 2025-12-30
Also published as: CN1793775A

Abstract

The present invention relates to a horseshoe-shaped screw vernier deepness gauge which can be used as a tool for measuring the axial depth of products with a revolution shaft or the assembly clearances of relative parts. The horseshoe-shaped screw vernier deepness gauge is composed of a horseshoe-shaped screw vernier deepness gauge body, a measuring head with a large diameter, a measuring rod, a fixed sleeve barrel, a microdrum, etc., wherein the horseshoe-shaped gauge body can avoid the interference of the revolution shaft to enlarge a reference plane to be measured and improve the measuring stability, and the measuring head with a large diameter can avoid the interference to the deepness gauge by a rotor shaft of a product to be measured; the measuring reachability is raised. A vernier principle is used skillfully on a screw pair, and therefore, the measuring accuracy is raised by 10 times. By changing the scale solution and introducing the +/-concept, the actually measured reading is visual.

Description

Horseshoe-shaped screw vernier deepness gauge

Technical field

The invention belongs to the survey instrument field, relate in particular to a kind of horseshoe-shaped screw vernier deepness gauge.

Background technology

In engine turbine pump when assembling,, the quality of fit height is adjusted calculation of complex, non-interchangeability between the part in the assembling process, and each assembling all need select for use suitable adjusting pad to adjust tolerance clearance between each part, to satisfy matching requirements.To rationally select adjusting pad for use, just need in assembling process, to measure in advance the concrete numerical value of correspondence position for calculating and assembling usefulness.Because the measuring head of common pit gauge is all littler than the diameter of microdrum and fixed muffle, when needs were measured near gap between revolving shaft place part and axial depth, common pit gauge just can't measure corresponding data; The station meter body of common pit gauge is a strip, this just makes when using common pit gauge, the contact area of chi body can be subjected to the restriction of solid of revolution, has reduced the contact area of chi body end face and product benchmark face greatly, has reduced the precision and the reliability of used pit gauge indirectly.General common pit gauge all is to utilize the fine pitch accurate thread, carries out calibration according to spiral calibration principle, and measuring accuracy can only reach about 0.01mm, is difficult to satisfy the high precision matching requirements; The scale value of common pit gauge is only on the occasion of, direct measuring height size.

Summary of the invention

The object of the present invention is to provide a kind of large diameter measurement head that has, and can directly read the horseshoe-shaped screw vernier deepness gauge of thousand tantiles behind the radix point.

The present invention is made up of shape of a hoof chi body, large diameter measurement head, sounding rod, fixed muffle and microdrum etc., its characteristics are: shape of a hoof chi body links together by press fit and fixed muffle, large diameter measurement head rest M3 screw thread and sounding rod screw, sounding rod, fixed muffle and microdrum all link together according to common pit gauge mode, when the measuring head end face with after chi body end face overlaps, 0 groove of microdrum aligns with 0 groove of fixed muffle, and simultaneously 19 of microdrum grooves align with the 10th the vertical groove that increases newly on the fixed muffle.

During use shape of a hoof chi shown consideration for and on positioning reference, the rotation microdrum moves vertically to drive sounding rod and measuring head, when measuring head and tested surface paste and after, earlier read radix A from fixed muffle, by reading on the microdrum and the stationary magazine creel zero corresponding reading B of groove, read the vernier reading C that aligns with the microdrum groove on the vernier more again, last, three readings are pressed: A+0.01*B+0.001*C=D, the D value is exactly the depth value of surveying.

Measuring head diameter of the present invention is greater than microdrum and fixed muffle diameter, when measuring head comes to revolving shaft, the microdrum of pit gauge and fixed muffle and revolving shaft also have certain clearance, this measuring head that has not only solved common pit gauge can't measure the problem near the revolving shaft place part degree of depth and gap owing to interfered by microdrum and fixed muffle and revolving shaft, but also has strengthened the operability of pit gauge in measuring process.It is to design according to the diameter of tested rotary part and the diameter dimension of positioning reference that the chi body adopts horseshoe-shaped concrete shape, this shape has not only effectively been avoided tested part, but also increased the contact area of chi body location to the full extent, make measurement stability significantly improve.Common pit gauge utilizes accurate screw pair transmission principle to carry out survey measurements, microdrum internal thread pitch is 0.5mm, when microdrum rotates a circle, microdrum and measuring head relative fixed sleeve and chi body all move down 0.5mm, and be carved with the groove of 50 five equilibriums on the microdrum circumference, microdrum changes lattice, and measuring head axial displacement is 0.01mm.The present invention is incorporated into cursor principle in the screw pair on the principle basis of common pit gauge spiral calibration, and promptly being increases by 10 vertical grooves again on stationary magazine creel, adds formerly in 11 altogether of zero grooves, and these 11 vertical grooves have just utilized cursor principle dexterously.Because groove is 50 five equilibriums on the microdrum, every lattice are represented 0.01mm, the central angle of every lattice correspondence is 7.2 °, make that microdrum is a main scale, 11 vertical lines on the fixed muffle are vernier, 19 lattice on the corresponding main scale of 10 lattice of vernier, vernier just has been divided into 10 equal portions with 0.01 millimeter of the lattice correspondence on the main scale like this, every lattice vernier is with regard to corresponding 0.001mm, the central angle of every lattice groove correspondence then is (19 * 7.2 °)/10=13.68 ° on the vernier, so cursor principle application in this invention makes reading accuracy improve 10 times than the precision of common pit gauge.Fixed muffle scale of the present invention also adopts new mode, promptly the 0-25 spacing of general pit gauge be the groove value of

1mm change

20,15,10,5 into ,-0+, 5,5 ,-0+, 5 scopes increase by 10 horizontal ruling span 0.5mm, owing on scale, quoted+,-notion, this not only makes the present invention can directly measure the projection size in the certain limit, also can be directly positive and negative by reading, judging measurement result is the degree of depth or height.

The present invention is owing to adopted shape of a hoof chi body and large diameter measurement head, can avoid the interference of revolving shaft, increase the positioning reference surface of contact, measurement accuracy and stability are improved, on screw pair, use cursor principle dexterously, make measuring accuracy improve 10 times; Change the scale scheme, introduce+,-notion, make the actual measurement reading more directly perceived.

Description of drawings

Fig. 1 is an axial section of the present invention;

Fig. 2 is a side view of the present invention;

Fig. 3 is the synoptic diagram of the present invention when measuring near the solid of revolution place part degree of depth;

Fig. 4 is a shape of a hoof chi body of the present invention location synoptic diagram;

Fig. 5 is that groove of the present invention launches synoptic diagram;

Fig. 6 is a vernier calibration schematic diagram of the present invention.

Embodiment

Below in conjunction with accompanying drawing the present invention is further specified:

As shown in Figure 1, the present invention is made up of shape of a hoof chi body 2, large diameter measurement head 1, sounding rod 3, fixed muffle 4 and microdrum 5, shape of a hoof chi body 2 and fixed muffle 4 interference fit, measuring head 1 fuses by the M3 screw thread with sounding rod 3, and sounding rod 3, fixed muffle 4 and microdrum 5 are that the mode according to common pit gauge links together.When measuring head 1 with after chi body 2 both ends of the surface overlap, 0 groove of microdrum 5 is alignd with 0 groove of fixed muffle 4,19 of the grooves of microdrum 5 align with the 10th the vertical groove that increases newly on the fixed muffle 4 simultaneously.

As shown in Figure 2, the diameter parts of large diameter measurement head 1 is more outstanding than the inner arc limit of shape of a hoof chi body 2, therefore, large diameter measurement head 1 contacts with revolving shaft prior to shape of a hoof chi body 2 in measuring process, thereby avoid the interference of revolving shaft, record around the size of any one degree of depth of piece surface of revolving shaft.

As shown in Figure 3, because the diameter of large diameter measurement head 1 is greater than fixed muffle 4 and microdrum 5, when shape of a hoof chi body 2 contacts with positioning reference plane, large diameter measurement head 1 is near revolving shaft, fixed muffle 4 and microdrum 5 also have certain interval with revolving shaft, record the size near any one degree of depth of piece surface of revolving shaft.

As shown in Figure 4, concrete shape according to the diameter dimension design shape of a hoof chi body 2 of the diameter of tested rotary part and positioning reference, this shape has not only effectively been avoided revolving shaft, but also increased the contact area of chi body location to the full extent, also according to the coupling bolt outshot of reference surface, designed the many places depression simultaneously, interfered to avoid bolt at shape of a hoof chi body end face, make accurate positioning, measurement stability significantly improves.When large diameter measurement head 1 during near revolving shaft, shape of a hoof chi body 2 has touched positioning reference plane to the full extent when avoiding revolving shaft.

As shown in Figure 5, the spacing of groove 5～20 is 1mm, 5 ,-0+, 5 spacing are 0.5mm, the vernier part of the circular arc type that newly-increased 10 vertical grooves and location zero line are formed, and the central angle between per two grooves is 13.68 degree.Wherein the width of every groove is 0.15 ± 0.05mm, and the line width difference is not more than 0.05mm, carves characters highly to be 2mm.

As shown in Figure 6,11 grooves of below are newly-increased 10 vertical grooves and location zero line, the top is the part groove of microdrum 5, the utilization cursor principle, groove is 50 lattice on the microdrum 5, every lattice are represented 0.01mm, the central angle of every lattice correspondence is 7.2 degree, make microdrum 5 be main scale, 19 lattice on the corresponding microdrum 5 of 10 lattice on the fixed muffle 4, so just the 0.01mm of a lattice correspondence has been divided into 10 equal portions, so the corresponding 0.001mm of every lattice vernier, the central angle of every lattice groove correspondence then is 19 * 7.2/10=13.68 degree on the microdrum 5.

Claims

1. horseshoe-shaped screw vernier deepness gauge, by shape of a hoof chi body (2), large diameter measurement head (1), sounding rod (3), fixed muffle (4) and microdrum (5) are formed, it is characterized in that: shape of a hoof chi body (2) links together by press fit and fixed muffle (4), large diameter measurement head (1) screws by M3 screw thread and sounding rod (3), sounding rod (3), fixed muffle (4) and microdrum (5) all link together according to common pit gauge mode, when large diameter measurement head (1) end face with after shape of a hoof chi body (2) end face overlaps, 0 groove of microdrum (5) aligns with 0 groove of fixed muffle (4), and simultaneously 19 of microdrum (5) grooves align with the 10th the vertical groove that increases newly on the fixed muffle (4).

2. horseshoe-shaped screw vernier deepness gauge according to claim 1 is characterized in that: the diameter parts of large diameter measurement head (1) is more outstanding than the inner arc limit of shape of a hoof chi body (2).

3. horseshoe-shaped screw vernier deepness gauge according to claim 1 is characterized in that: groove 5～20 spacings on the described fixed muffle (4) are 1mm, 5 ,-0+, 5 spacings are 0.5mm, the spacing of 10 vertical grooves is 13.68 degree; When the end face of large diameter measurement head (1) exceeded shape of a hoof chi body (2), measured value was for negative; On the contrary, when the end face of large diameter measurement head (1) was lower than chi body (2), measured value was for just.

4. horseshoe-shaped screw vernier deepness gauge according to claim 1, it is characterized in that: the interior physical dimension of described shape of a hoof chi body (2) is determined according to the diameter of tested rotary part and the diameter of positioning reference, and is processed necessary sinking according to axial coupling bolt position.