CN2153040Y - High-precision rotary indexing table - Google Patents

Abstract

The utility model relates to an electromechanical integrated high-precision indexing table. A magnetic detector is used for taking out the magnetic angle displacement signal of a rotary table, and the signal is transferred by a signal transmission gear is processed by difference frequency, K frequency multiplication and a microprocessor, and then the angle displacement of the rotary table is showed on a display screen. A high-speed rotary low-precision indexing fluted disc is taken as high-precision indexing reference in a difference frequency mode, and a leafspring coupling device with three rings is utilized for eliminating concentricity error in installation. Compared with similar products, the utility model has low production cost, high precision, arbitrary index and convenient operation.

Description

High-precision rotary indexing table

The utility model belongs to machinery and measures articles for use and make the field.

At present, the domestic and international various forms of producing, as steel ball graduation formula, optical dividing head formula, raster pattern, multi-gear disk inserted type, polygon formula, induction synchronous mode etc., all there are some shortcomings in the micro swivel that principle is different.One can not arbitrary indexing, as steel-ball type, and multi-gear disk inserted type, polygon formula etc.; Its two, make difficulty, process equipment requires high.Its three costs height, fetch long price.

In view of the above shortcoming of prior art, the purpose of this utility model is, design a kind of can arbitrary indexing, easy to manufacture, with low cost, the rotary table that precision is high.

The purpose of this utility model is to realize by following mode.

In the precision round subsection platform that constitutes by solid of revolution and Angular Displacement Detecting mechanism, one triple gear is co-axially mounted on the synchronous motor output shaft, three sender gears 3,4,5 are housed on this triple gear, be respectively equipped with magnetic detector 7 and 8,8a on the matrix with on sender gear 3 and 4 opposite positions, wherein magnetic detector 8 is 180 degree symmetric arrangement with 8a and installs, its separately signal take out by signal line 10 series connection; Another is installed on the solid of revolution also being 180 degree symmetric arrangement with sender gear 5 corresponding magnetic detectors 9 and 9a, its separately signal take out by signal line 11 series connection.The signal of detector 7 is taken out by signal line 20.Signal line 10 links to each other with the difference frequency device with 11, and signal line 20 links to each other with the K frequency multiplier, and the difference frequency device carries out calculation process with K frequency multiplier and and links to each other with the microprocessor that corner shows.

After having adopted design as above, the utility model can carry out arbitrary indexing, owing to adopted the difference frequency principle, with the low precision calibration fluted disc of high speed rotary as the precision round subsection benchmark, make and manufacture easily, greatly reducing cost, the calibration accuracy of detection can reach ± 1 ", ± 1.5 ", ± 2 " three class.In addition, the supporting high precision angle-measuring instrument that also can be used as of the utility model and collimating light pipe uses.

Description of drawings is as follows:

Fig. 1 is the utility model structure and schematic diagram

Below in conjunction with accompanying drawing, structure of the present utility model is described in further detail.

In Fig. 1, triple gear 1 is co-axially mounted on the output shaft of synchronous motor 2, three sender gears 3,4 are arranged on it, 5, on the matrix 6 with sender gear 3(tooth number Z r) and 4(tooth number Z p) corresponding times put and be respectively equipped with magnetic detector 7 and 8,8a, wherein detector 8 is 180 degree symmetric arrangement with 8a, its separately signal take out by signal line 10 series connection.Another to sender gear 5(tooth number Z o) corresponding magnetic detector 9 and 9a also be 180 degree symmetric arrangement and be installed on the solid of revolution 13, its separately signal take out by signal line 11 series connection.The signal of detector 7 is taken out by signal line 20.

In fact the magnetic detector is made up of magnet coil, and gear teeth are whenever skimmed at its magnetic circuit slit place, and coil just induces an electric pulse.Detector 8 and 8a and 9 purpose of taking out signal of connecting with 9a180 degree symmetric arrangement is to eliminate the influence of eccentric error.

When solid of revolution does not rotate, start the synchronous motor rotation.

Detector 9 is connected with 9a and is got signal: fo=Zo50Hz

Detector 8 is connected with 8a and is got signal: fp=Zp50Hz

Detector 7 is got signal: fr-Zr50Hz

Fo, fp two-way signal by difference frequency device 14 back signals is

fc＝（Zo－Zp）·50Hz

The fr signal by K frequency multiplier 15 back signals is

fb＝KZr·50Hz

Not under the rotation situation, its frequency ratio is a fixed value at solid of revolution for fc and fb two-way signal

(fb)/(fc) ＝ (KZr·50Hz)/(（Zo－Zp）·50Hz) ＝ (KZr)/(Zo－Zp)

When solid of revolution rotates, detector 9 and 9a will rotate thereupon.Fc will form the ripple with respect to the fb phase shifts---the row ripple.The capable wave number that moves past of row ripple is corresponding with the angle that solid of revolution 13 turns over phase place.When solid of revolution turns over a week (360 degree), the capable ripple of fc moves past Zo ripple with row, presses fc, and the fb frequency ratio is equivalent to the capable wave number that moves past of fb and is

Zo× (fb)/(fc) ＝ (KZr·Zo)/(Zo－Zp)

So fb is δ=360(Zo-Zp)/KZrZo with respect to the pulse equivalency of row ripple.

Fc, fb two-way signal enter microprocessor 16 and carry out computing and angle display process, and when solid of revolution did not rotate, fb/fc fixed, and ripple of the every mistake of fc, fb will accurately be pass by KZr/(Zo-Zp) individual ripple.When the solid of revolution rotation, fc produces the row ripple, can be considered fb and produces the row ripple with respect to fc.W is the capable wave number of fb with respect to fc, and W δ is exactly the angular displacement number that solid of revolution turns over, and microprocessor is worth its degree of being converted to, minute, second angle, and it is demonstrated.

For eliminating matrix 6 centres of gyration and solid of revolution 13 centres of gyration influence that concentricity is brought is installed, one three-ring type sheet spring unitor 17 is connected between matrix 6 and the platform wall 19, sponge the displacement degree of freedom and the rotary freedom of other direction respectively by three sheet springs, limited the revolution degree of freedom of matrix system only with stronger rigidity, the error that off-centre is caused is eliminated.

For satisfying the need of work of K frequency multiplier, can on matrix 6, be 180 degree places another magnetic detector 7a is set with detector 7 so that 7 with 7a between signal phasic difference 90 degree mutually.

Because detector 9 and 9a rotate with solid of revolution 13, its series connection signal line 11 can derive by conducting slip ring 21.

Claims (2)

1, a kind of high-precision rotary circular dividing table is made of solid of revolution 13 and Angular Displacement Detecting mechanism, it is characterized in that:

A) triple gear 1 is co-axially mounted on synchronous motor 2 output shafts, and gear 3,4,5 is housed on it; Be respectively equipped with magnetic detector 7 and 8,8a on the matrix 6 with on sender gear 3 and 4 opposite positions, magnetic detector 8 and 8a are the symmetrical mounting arrangements of 180 degree, its separately signal take out by signal line 10 series connection; Another is arranged symmetrically on the solid of revolution 13 also being 180 degree with sender gear 5 corresponding magnetic detectors 9 and 9a, its separately signal take out by signal line 11 series connection; The signal of detector 7 is taken out by signal line 20;

B) link to each other with difference frequency device 14 with 11 in signal line 10, signal line 20 links to each other with K frequency multiplier 15; Difference frequency device 14 carries out calculation process with K frequency multiplier 15 and and links to each other with the microprocessor 16 that corner shows.

2, the rotary table according to claim 1 is characterized in that a three-ring type sheet spring unitor 17 is connected between matrix 6 and the platform wall 19.

Images