CN2513075Y

CN2513075Y - Angular radius measuring device

Info

Publication number: CN2513075Y
Application number: CN 01277695
Authority: CN
Inventors: 郑海波; 郑凌云
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-12-31
Filing date: 2001-12-31
Publication date: 2002-09-25
Anticipated expiration: 2011-12-31

Abstract

The utility model relates to an angular radius measuring device, which uses three measuring rods to measure the angle and the radius. Wherein, two follower levers are fixed on a principal caliper and an auxiliary caliper respectively, a stem is arranged above the principal caliper or the auxiliary caliper. The three measuring rods are measuring rods are in axes parallel and coplanar, and the two follower levers are adjacent; when measuring the radius, the principal caliper and the auxiliary caliper displace relatively, so as to make the three measuring rods contact with the circular arc to be measured simultaneously; when measuring the angle, the stem and one side the measuring angle are coplanar, two follower levers contact with another side of simultaneously. The relative displacement of the principal caliper and the auxiliary caliper are converted into the measured value by a measuring circuit and is outputted to a LCD. The utility model can be used for measuring the angle and the radius.

Description

The angle radius measuring device

Affiliated technical field

The utility model relates to a kind of instrument that not only can be used to take measurement of an angle but also can be used to measure radius.

Background technology

The instrument and equipment that is used at present take measurement of an angle mainly contains: 1) angular templet can only be used to measure special angle; 2) universal protractor can be measured arbitrarily angledly, but measuring error is bigger, and bevel protractor itself is also heavy.3) sine gauge, the measuring accuracy height, but general must the measurement on platform is cumbersome; 4) coordinate measurment instrument is measured accurately, but needs bigger investment.

The instrument and equipment that is used to measure radius at present mainly contains: 1) radius gauge can only be used to measure certain radius.2) common slide calliper rule obtain radius by measuring diameter, if the central angle of measured circular arc is spent less than 180, diameter then can not be recorded.3) (see Shanghai Measuring and Cutting Tools Plant website: www.smctw.com.cn/data/caliper.pdf), the external arc diameter is measured in its special use to the circular arc slide calliper rule, and restricted to the action of measured circular arc.4) Chinese patent 90218334 described inner arc radius measuring instruments, interior arc diameter is measured in its special use.5) coordinate measurment instrument is measured accurately, but needs bigger investment.

Summary of the invention

In the weak point that is showed aspect angle and the radius measurement, the utility model provides a kind of angle radius measuring device at existing surveying instrument, and it can take measurement of an angle and inside and outside arc radius easily.

The technical scheme that its technical matters that solves the utility model adopts is: utilize three sounding rods to take measurement of an angle and radius.Wherein two sounding rods are called moving bar, are fixedly mounted on respectively on main scale and the secondary chi; Another root sounding rod is called basic bar, is installed on main scale or the secondary chi, can move relative to them, also can accurately be parked in an assigned address simultaneously so that measure radius; Three sounding rods are installed side by side, their parallel axes and coplane, and two moving bars are adjacent simultaneously.When measuring radius, main scale and secondary chi relatively move, and three sounding rods are contacted with measured circular arc simultaneously; When taking measurement of an angle,, drive two moving bars motions, they are contacted simultaneously with the another side of tested angle one side the overlapping of basic bar and tested angle allows main scale and secondary chi relative motion then.Concern according to the relative shift of main scale and secondary chi and the relative installation of three sounding rods, can calculate tested angle or radius.Radius measurement principle such as Fig. 1, Fig. 2 and shown in Figure 3, the distance of establishing between adjacent two sounding rods is identical, is d, and r is the radius of sounding rod end face, and s is the relative shift of main scale and secondary chi, and R is the radius of circular arc to be measured, the outer arc radius computing formula is: R=(s ²+ d ²)/2s-r, the inner arc radius computing formula is: R=(s ²+ d ²)/2s+r.The measurement of angle principle as shown in Figure 4 and Figure 5, wherein s is the relative shift of main scale and secondary chi, the spacing of the moving bars of L two, the computing formula of angle is: A=arctg (L/s).Adopt metering circuit shown in Figure 6 to realize the digital Presentation Function of measured value, the rate of travel of main scale and secondary chi is converted to electric signal through displacement transducer, electric signal through amplify with mould/number conversion after become digital signal, single-chip microcomputer is gathered digital signal, and the calculating of operation angle or radius and display routine, finally on LCD, export measured value.

The beneficial effects of the utility model are can take measurement of an angle easily and the radius of inside and outside circular arc, and cost is low, and are simple in structure.

Description of drawings

Fig. 1 is the initial relative position synoptic diagram of three sounding rods before measuring radius.

Fig. 2 is the relative position synoptic diagram of three sounding rods when finishing the inner arc radius measurement.

Fig. 3 is the relative position synoptic diagram of three sounding rods when finishing the outer arc radius measurement.

Fig. 4 is the relative position synoptic diagram of three sounding rods when finishing the measurement of salient angle degree.

Fig. 5 is the relative position synoptic diagram of three sounding rods when finishing the measurement of re-entrant angle degree.

Fig. 6 is a metering circuit schematic diagram of the present utility model.

Fig. 7 is the front elevation of first embodiment of the present utility model.

Fig. 8 is the A-A cut-open view of first embodiment of the present utility model.

Fig. 9 is the front elevation of second embodiment of the present utility model.

Figure 10 is the front elevation of the 3rd embodiment of the present utility model.

Among the figure, 1. basic bar, 2. moving bar A, 3. moving bar B, 4. secondary chi, 5. spring, 6. main scale, 7. LCD, 8. movable plate electrode, 9. fixed plate, 10. button, 11. circuit boards, 12. bearings.

Embodiment

In Fig. 7 and first embodiment shown in Figure 8, the relative shift of main scale (6) and secondary chi (4) is converted to electric signal through capacitive displacement transducer.Three sounding rods are respectively basic bar (1), moving bar A (2) and moving bar B (3); The fixed plate (9) of base bar (1) and moving bar B (3) and capacitive displacement transducer is installed on the main scale (6); When taking measurement of an angle, in order to ensure basic bar (1) can with the fine coincidence in one side of measured angle, basic bar (1) can be in its mounting hole relatively main scale slide; When measuring radius, basic bar (1) keeps in touch with its mounting hole bottom, is still in main scale relatively; The movable plate electrode (8) of moving bar A (2) and capacitive displacement transducer is installed on the secondary chi (4); Secondary chi (4) can move in the chute of main scale (6), relatively moves thereby drive three sounding rods; The parallel axes of three sounding rods and coplane.Button (10), circuit board (11), LCD (7) are installed on the main scale (6); Spring (5) is contained in the chute of main scale (6), and its effect is to allow bar A (2) reset after measurement finishes.During measurement, the axis direction along sounding rod in the chute of secondary chi (4) on main scale (6) moves, and drives three sounding rods and relatively moves, and its relative shift is converted to tested angle value or radius value by metering circuit, and outputs to LCD (7).

In second embodiment shown in Figure 9, its measuring principle is identical with first embodiment, different is the structure of having utilized existing slide calliper rule, base bar (1), moving bar A (2) and moving bar B (3) are installed in respectively on the main scale (6) and secondary chi (4) of slide calliper rule, and adopt the metering circuit that has digimatic calipers now, only the program among the EPROM is increased the calculating and the Presentation Function of angle and radius.

In the 3rd embodiment shown in Figure 10, its measuring principle is identical with second embodiment, different is basic bar (1) and moving bar B (3) is installed in the main scale (6) of slide calliper rule by bearing (12), and the benefit that increases bearing (12) is to make the distance between basic bar (1) and the moving bar B (3) not to be subjected to the restriction of the size of slide calliper rule own.

Claims

1. angle radius measuring device, comprise main scale, secondary chi and metering circuit, it is characterized in that: utilize three sounding rods to take measurement of an angle and radius, wherein two moving bars are fixedly mounted on respectively on main scale and the secondary chi, the base bar is installed on main scale or the secondary chi, can move relative to them, also an assigned address can be parked in accurately simultaneously so that measure radius, three sounding rods are installed side by side, their parallel axes and coplane, two moving bars are adjacent, when measuring radius, three sounding rods contact with measured circular arc simultaneously, when taking measurement of an angle, one side the overlapping of basic bar and tested angle, two moving bars contact simultaneously with the another side of tested angle, the relative shift of main scale and secondary chi is converted to measured value through metering circuit, and outputs on the LCD.

2. angle radius measuring device according to claim 1 is characterized in that: utilize the main scale of slide calliper rule, secondary chi and metering circuit, three sounding rods are installed in respectively on the main scale and secondary chi of slide calliper rule.

3. angle radius measuring device according to claim 2 is characterized in that: wherein two sounding rods are installed in respectively on the main scale or secondary chi of slide calliper rule by a bearing, make two distances between the sounding rod not be subjected to the restriction of the size of slide calliper rule own.