CN1162706C - Revolution meter capable of measuring rotating speed in both forward and reverse directions - Google Patents

Abstract

The present invention relates to a revolution meter for measuring rotating speed in both forward directions and reverse directions, which is formed by jointly and electrically connecting a display, a power switch, a serial RS-232 interface, a probe head socket, a rotating speed measurement probe head and a circuit board. The circuit part of the revolution meter is formed by jointly and electrically connecting a magnetic-sensing switching circuit, a single chip computer circuit, a bit driving and decoding circuit, a serial RS-232 interface circuit and the display. The present invention can unify two parts of circuits for measuring the rotating speed and distinguishing directions, and uses digital type display. The present invention has the advantages of wide rotating speed range and low cost.

Description

Measure the tachometer gage of rotating speed both forward and reverse directions

(1) technical field

The present invention relates to a kind of tachometer gage of measuring the rotating speed both forward and reverse directions, belong to automation instrument technology.

(2) background technology

Tachometer gage belongs to instrument and meter for automation, is divided into digital and pointer two kinds by display mode, and range of application is more extensive, has obtained general application in fields such as automobile, motorcycle, lathes.Its market demand is quite big, and the output value is also very high.At present, the problem that tachometer gage exists is: 1. measure rotating speed and differentiate direction two parts circuit independently, be equivalent to two instrument; 2. select the digital circuit device for use, the cost of instrument is than higher, and volume is big.

(3) Fa Ming content

The object of the present invention is to provide and a kind ofly can measure rotating speed and differentiate the tachometer gage that direction two parts circuit is united, it adopts digital display, and the measurement range of speeds is wide, and cost is low.

Tachometer gage of the present invention is by display, power switch, the serial RS-232 interface, probe socket, measure rotational speed probe, rotation magnetic patch A, rotation magnetic patch B and circuit board are electrically connected jointly and form, wherein, circuit on the circuit board comprises the magnetosensitive on-off circuit, single chip circuit, the position drives and decoding scheme, serial RS-232 interface circuit, its mutual alignment with annexation is: the position on display and the circuit board drives and decoding scheme is electrically connected mutually, serial RS232 interface socket is electrically connected mutually with single-chip microcomputer on the circuit board, measure that rotational speed probe is inserted on the probe socket and be electrically connected mutually with single chip circuit on the circuit board, power switch is electrically connected mutually with the control power lead of circuit board; Two groups of magnetosensitive on-off circuits are electrically connected with two counting input ends of single-chip microcomputer respectively mutually by two output lines; The position drives with decoding scheme and is electrically connected mutually with single-chip microcomputer, display by decoding incoming line, decoding output line respectively; The communication input of the connection of serial RS-232 interface and single-chip microcomputer, output line are electrically connected; Rotation magnetic patch A and rotation magnetic patch B are installed on the measured rotating object, angle α＜180 between two magnetic patch °.

In above-mentioned tachometer gage, the magnetosensitive on-off circuit is electrically connected and is constituted by resistance R 1～R4, magnetosensitive switching device IC1, IC2; The position drives and decoding scheme is electrically connected and is constituted by decoding scheme IC3, bit driver circuit IC4; Single chip circuit is electrically connected and is constituted by capacitor C 1 and C2, crystal oscillating circuit MZ, single-chip microcomputer IC5, resistance R 5, capacitor C 3; Serial line interface RS-232 circuit is electrically connected and is constituted by serial interface circuit IC6, capacitor C 4～C7; Display is 6 light-emitting diode displays, constitutes by showing that charactron LED1～6 are electrically connected.

In the present invention, the measurement both forward and reverse directions of single-chip microcomputer and the software program of rotating speed are as follows: when A magnetic patch during near magnetosensitive on-off circuit IC1, have low pulse to produce, output to single-chip microcomputer T0 pin, the B magnetic patch has low pulse to produce during near magnetosensitive on-off circuit IC2, outputs to single-chip microcomputer T1 pin.Drive counter and interrupt T0, turn off and interrupt T1: as magnetic patch A during, there is the T0 of interruption to produce near IC1, the counting beginning, inquiry T1, magnetic patch B have low level to produce during near IC2, stop the T0 counting, and the time is t _ABOpen and interrupt T1, turn off and interrupt T0: as magnetic patch B during, there is the T1 of interruption to produce near IC2, the counting beginning, inquiry T0, magnetic patch A have low level during near IC1, stop the T1 counting, and the time is t _BAMistiming Δ t=t _AB-t _BA, when Δ t＜0, rotating object is counterclockwise, is shown as "-" number; When Δ t＞0, rotating object is a clockwise direction, is shown as "+" number.The rotating speed time measurement is driven counter and interrupted T0, turns off and interrupts T1: magnetic patch A interrupts producing during near IC1, the counting beginning, and inquiry T0, for low level stops to count, promptly magnetic patch A rotates a circle, and obtains rotating speed time t for the second time, and t gets inverse to the time, obtains rotating speed $N_1=\frac{1}{t}$ (revolutions per second), $N_2=\frac{60}{t}$ (rev/min).Owing to guarantee α＜180 ° when magnetic patch machinery is installed, Δ t ≠ 0 arranged.

The style of work principle and the circuit working principle of this tachometer gage are as follows: magnetic patch A and magnetic patch B trigger the magnetosensitive on-off circuit respectively during the object rotation, the pulse signal of magnetosensitive on-off circuit output is input to two input ends of counter T0, T1 of single-chip microcomputer IC5, utilize counter T0 to measure rotating speed, utilize double counting to calculate the time of measuring rotating speed respectively, twice time is subtracted each other the both forward and reverse directions that can judge rotating object.The tach signal of measuring send the position to drive and decoding scheme respectively by the P1 mouth of single-chip microcomputer, and the process position drives and decoding scheme send LED to show, and exports by the serial RS-232 interface.

The present invention compared with prior art has following advantage and effect: (1) measures rotating speed and the judgement direction is utilized same metering circuit; (2) circuit devcie of tachometer gage of the present invention is few, and cost is low; (3) the measurement range of speeds is wide.

(4) description of drawings

Below in conjunction with Figure of description and concrete embodiment the present invention further is illustrated:

Fig. 1 is an appearance structure synoptic diagram of the present invention;

Fig. 2 is rotating object of the present invention and two magnetic patch mounting means synoptic diagram;

Fig. 3 is a circuit side connector block diagram of the present invention;

Fig. 4 is circuit theory diagrams of the present invention;

Fig. 5 is a flow chart of the present invention.

(5) concrete embodiment

In Fig. 1,1 is that 6 light-emitting diode displays, 2 are that casing, 3 is that power switch, 4 is that serial RS-232 interface, 5 is probe socket.

In Fig. 2,8 for measuring rotational speed probe, 6 and 7 representative rotation magnetic patch A and B respectively, and α is two angles between the magnetic patch, α＜180 °.

In Fig. 1 and Fig. 2, the mutual alignment of above-mentioned each parts and annexation are: circuit board is fixedly installed in the casing 2, light-emitting diode display 1 is installed on the front panel top of casing 2 and drives and decoding scheme is electrically connected mutually with position on the circuit board, serial RS232 interface socket 4 is installed on the rear panel of casing 2 and is electrically connected mutually with single-chip microcomputer on the circuit board, measure that rotational speed probe 8 is inserted on the probe socket 5 and be electrically connected mutually with single-chip microcomputer on the circuit board, power switch 3 is installed on the rear panel top of casing and is electrically connected mutually with the control power lead of circuit board, and rotation magnetic patch 6 and 7 is installed on the measured rotating object.

As seen from Figure 3, magnetic patch A and magnetic patch B trigger the magnetosensitive on-off circuit respectively during the object rotation, and the pulse signal of magnetosensitive on-off circuit output is input in the single-chip microcomputer, can judge the both forward and reverse directions of rotating object through relevant treatment.The tach signal of measuring send the position to drive and decoding scheme respectively, and the process position drives and decoding scheme send LED to show, and exports by the serial RS-232 interface.

Show that by Fig. 4 the magnetosensitive on-off circuit is electrically connected and is constituted by resistance R 1～R4, magnetosensitive switching device IC1, IC2; The position drives and decoding scheme is electrically connected and is constituted by decoding scheme IC3, bit driver circuit IC4; Single chip circuit is electrically connected and is constituted by capacitor C 1 and C2, crystal oscillating circuit MZ, single-chip microcomputer IC5, resistance R 5, capacitor C 3; Serial line interface RS-232 circuit is electrically connected and is constituted by serial interface circuit IC6, capacitor C 4～C7; Light-emitting diode display constitutes by showing that charactron LED1～6 are electrically connected.In the drawings, the line that label is identical interconnects.

Shown as magnetic patch A during near magnetosensitive on-off circuit IC1, have low pulse to produce by Fig. 5, output to single-chip microcomputer T0 pin, magnetic patch B has low pulse to produce during near magnetosensitive on-off circuit IC2, outputs to single-chip microcomputer T1 pin.Drive counter and interrupt T0, turn off and interrupt T1: as magnetic patch A during, there is the T0 of interruption to produce near IC1, the counting beginning, inquiry T1, magnetic patch B have low level to produce during near IC2, stop the T0 counting, and the time is t _ABOpen and interrupt T1, turn off and interrupt T0: as magnetic patch B during, there is the T1 of interruption to produce near IC2, the counting beginning, inquiry T0, magnetic patch A have low level during near IC1, stop the T1 counting, and the time is t _BAMistiming Δ t=t _AB-t _BA, when Δ t＜0, rotating object is counterclockwise, is shown as "-" number; When Δ t＞0, rotating object is a clockwise direction, is shown as "+" number.The rotating speed time measurement is driven counter and interrupted T0, turns off and interrupts T1: magnetic patch A interrupts producing during near IC1, the counting beginning, and inquiry T0, for low level stops to count, promptly magnetic patch A rotates a circle, and obtains rotating speed time t for the second time, and t gets inverse to the time, obtains rotating speed $N_1=\frac{1}{t}$ (revolutions per second), $N_2=\frac{60}{t}$ (rev/min).Because the installation of magnetic patch machinery guarantees α＜180 ° Δ t ≠ 0 is arranged.

Making of the present invention and each components and parts require as follows: (1) casing and panel can be selected plastics or other metal material for use, process with method in common according to Fig. 1; (2) light-emitting diode display is selected getting final product of universal models for use; (3) press Fig. 4 draw PCB, select components and parts to weld and Installation and Debugging then, wherein, the optional US3020 type of IC1 and IC2 magnetosensitive on-off circuit; But the optional decoding driving circuit 4513 of IC3; The optional address decoding circuitry 74LS138 of IC4; The optional single chip computer AT 89C51 circuit of IC5; The optional communication interface circuit of IC6 TSC232 circuit; (4) circuit board that Installation and Debugging are good is loaded in the casing, and response part mutually is connected with light-emitting diode display, power switch, serial line interface respectively.

Claims (3)

1, a kind of tachometer gage of measuring the rotating speed both forward and reverse directions, by display, power switch, the serial RS-232 interface, probe socket, measure rotational speed probe, rotation magnetic patch (A), rotation magnetic patch (B) and circuit board are electrically connected jointly and form, wherein, circuit on the circuit board comprises the magnetosensitive on-off circuit, single chip circuit, the position drives and decoding scheme, serial RS-232 interface circuit, its mutual alignment with annexation is: the position on display and the circuit board drives and decoding scheme is electrically connected mutually, serial RS232 interface socket is electrically connected mutually with single-chip microcomputer on the circuit board, measure that rotational speed probe is inserted on the probe socket and be electrically connected mutually with single chip circuit on the circuit board, power switch is electrically connected mutually with the control power lead of circuit board; Two groups of magnetosensitive on-off circuits are electrically connected with two counting input ends of single-chip microcomputer respectively mutually by two output lines; The position drives with decoding scheme and is electrically connected mutually with single-chip microcomputer, display by decoding incoming line, decoding output line respectively; The communication input of the connection of serial RS-232 interface and single-chip microcomputer, output line are electrically connected; Angle between the rotation magnetic patch (A) and rotate magnetic patch (B) and be installed on the measured rotating object, two magnetic patch is less than 180 °.

2, tachometer gage as claimed in claim 1 is characterized in that: the magnetosensitive on-off circuit is electrically connected and is constituted by resistance R 1～R4, magnetosensitive switching device IC1, IC2; The position drives and decoding scheme is electrically connected and is constituted by decoding scheme IC3, bit driver circuit IC4; Single chip circuit is electrically connected and is constituted by capacitor C 1 and C2, crystal oscillating circuit MZ, single-chip microcomputer IC5, resistance R 5, capacitor C 3; Serial line interface RS-232 circuit is electrically connected and is constituted by serial interface circuit IC6, capacitor C 4～C7; Display is 6 light-emitting diode displays, constitutes by showing that charactron LED1～6 are electrically connected.

3, tachometer gage as claimed in claim 2 is characterized in that: IC1 and IC2 select US3020 type magnetosensitive on-off circuit for use; But IC3 selects decoding driving circuit 4513 for use; IC4 selects address decoding circuitry 74LS138 for use; IC5 selects single chip computer AT 89C51 circuit for use; IC6 selects communication interface circuit TSC232 circuit for use.

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