CN87213537U

CN87213537U - Power measuring device

Info

Publication number: CN87213537U
Application number: CN 87213537
Authority: CN
Inventors: 曲兆林
Original assignee: AGRICULTURAL MECHANIZATION RESEARCH INSTITUTE ANHUI PROVINCE
Current assignee: AGRICULTURAL MECHANIZATION RESEARCH INSTITUTE ANHUI PROVINCE
Priority date: 1987-09-21
Filing date: 1987-09-21
Publication date: 1988-07-13

Abstract

The utility model relates to a power measuring device. The utility model is characterized in that four strain sheets are connected into an electric bridge for measuring torque or traction force. A voltage Vn generated by a rotation speed signal or a speed signal through a conversion device is added on the input end of the electric bridge, and thus the output end of the electric bridge obtains a corresponding power signal VN. Mechanical power can be directly displayed through a power displaying device. The utility model has the advantages of simple structure, low manufacture cost, proper precision and convenient operation. The utility model is suitable for measuring and displaying rotation shaft power and traction power under various conditions, and is an ideal mechanical power measuring and displaying device.

Description

Power measuring device

The utility model relates to a kind of power-measuring device.

In engineering survey, usually need to measure the rotating shaft power of rotary machine or the traction power of hitching machinery.The numerical value that shows power in measuring process in real time is very important.Realize that power measurement shows that two kinds of methods are generally arranged: first kind is moment of torsion (or tractive force) and rotating speed (or speed) signal to be imported computing machine calculate and show; Second kind is moment of torsion (or tractive force) and rotating speed (or speed) signal input digit circuit, realizes that the product of two signals calculates and demonstrate power.These two kinds of methods obviously all compare accurately, reliable, but instrument more complicated and cost height.

The purpose of this utility model is to adopt a kind of ball bearing made using to realize that the product of moment of torsion (or tractive force) and rotating speed (or speed) calculates and power is shown.

Principle of the present utility model as shown in Figure 1, by rotating speed (or speed) sensor 1, converting means 2, rotating speed (or speed) show 3, moment of torsion (or tractive force) sensor 6, product circuit 5 and power shows that 4 six parts form.Rotating speed (or speed) sensor 1 is frequency type or power generating type sensor; Converting means 2 as shown in Figure 2, by the circuit that R1, C1, BG, D1, C2, R2 form, its output voltage V n and rotating speed (or speed) are proportional; Rotating speed (or speed) shows that 3 are made of ammeter; Moment of torsion (or tractive force) sensor 6 is connected into electric bridge and is formed by flexible member and Ra, Rb, four foil gauges of Rc, Rd as shown in Figure 3, Figure 4, and electric bridge also is a product circuit 5; Power shows that 4 are made of ammeter.

This power-measuring device is by following mode work: send into converting means 2 by the signal that rotating speed (or speed) sensor comes, obtain and the proportional aanalogvoltage Vn of rotating speed (or speed) through converting means 2, Vn shows that by rotating speed (or speed) 3 show rotating speed (or speed); Vn adds A, the B two ends of measuring bridge 5 simultaneously as bridge power supply, as shown in Figure 5, the strain bridge of forming by foil gauge Ra, Rb, Rc, Rd, because of being subjected to moment of torsion (or tractive force) effect to produce output, amassing of voltage VN between its output terminal c, D and moment of torsion (or tractive force) and rotating speed (or speed) is proportional, thereby in electric bridge 5, realized the multiplication calculating of moment of torsion (or tractive force), obtained and the proportional voltage VN of power with rotating speed (or speed); VN shows that by power 4 show power.

The utility model has following advantage:

1. measuring accuracy is suitable, the power display precision is higher than 1%, applied range can be realized under the multiple condition movable type mechanicals such as engine, motor, automobile, engineering machinery, railway locomotive being carried out power measurement and demonstration in real time, and its service condition is unrestricted.

2. the utility model uses circuit simple, and element is few, and cost is low, and general every is no more than 200 yuan, and simultaneously, the reliability height shows flexibly, can adopt numeral to show, also can adopt pointer ammeter to show.

Fig. 1 is the functional-block diagram of this power-measuring device;

Fig. 2 is the converting means figure of this power-measuring device;

Fig. 3 is a kind of torque sensor principle and the foil gauge paste position figure of this power-measuring device;

Fig. 4 is the measuring bridge figure of this power-measuring device;

Fig. 5 is the circuit theory diagrams of this power-measuring device.

A kind of embodiment of the present utility model such as Fig. 3 and shown in Figure 5, in Fig. 5,2 is converting means, and 5 are torque measurement electric bridge and product circuit, and 4 for power shows, and 3 are the rotating speed demonstration.This example is used for measuring the power of diesel engine, compares with traditional hydraulic dynamometer, has changed in the past and can only measure rotating speed and torque, must just can be drawn the situation of power by artificial calculating, and is convenient greatly and and simplified the measurement of power operation.

Claims

1, a kind of by the torque of rotary machine and the tractive force and the rate signal of tach signal or hitching machinery, draw rotary machine or hitching machinery power signal and the power that shows is then surveyed device through converting means, it is characterized in that by rotating speed (or speed) sensor 1, converting means 2, rotating speed (or speed) show 3, moment of torsion (or tractive force) sensor 6, product circuit 5 and power shows that 4 form.

2, power-measuring device according to claim 1 is characterized in that the circuit that its converting means 2 is made up of R1, C1, BG, D1, C2, R2.

3, power-measuring device according to claim 1 is characterized in that its moment of torsion (or tractive force) sensor 6 is made up of the measuring bridge that Ra, Rb, four foil gauges of Rc, Rd are connected into.

4, power-measuring device according to claim 1 is characterized in that the measuring bridge that its product circuit 5 is made up of Ra, Rb, four foil gauges of Rc, Rd finishes product calculation.