SU1760397A1 - Signal indicator of limit value of torque - Google Patents

Abstract

The invention relates to load measuring technology and can be used to signal the achievement of a maximum torque on a rotating shaft. The aim of the invention is to increase reliability. The angular pitch of the placement of the modulator elements around the perimeter of the measuring disks 2, 3 is made more than twice the angular width of the modulator elements. When the elastic shaft 1 is twisted by an angle exceeding the angular width of the modulator elements, a pulse appears at the output of the comparator unit 10, indicating that the maximum torque value has been reached. 4 il.

Description

The invention relates to a measurement technique and can be used for registering, using a contactless method, the limiting value of a torque transmitted by a rotating shaft.

A torque meter is known, comprising an elastic shaft, with the ends of the base portion of which the measuring disks, speed sensors and the measuring circuit are rigidly connected.

However, this meter does not provide registration of torque limits.

A device for measuring the torque, comprising an elastic half-shaft, half-coupling, measuring spring, an electrical switch controlled by a pressure element with a roller supported on the end surface of the coupling half, is known.

However, the specified torque limiter has low accuracy, low speed and reliability.

The closest in technical essence to the present invention is a torque limit signaling device, which includes an elastic shaft on which bushings with gear disks, contacts, current collectors, illuminator and photodetectors are attached.

The disadvantage of this detector is low reliability due to the presence in its design of open measuring contacts and moving contacts of current collectors.

The purpose of the invention is to improve the reliability of the alarm limit value of the torque,

The goal is achieved by the fact that, in the signaling device, the limiting value of the torque, containing two measuring disks, installed at the ends of the elastic shaft and equipped with modulator elements placed with a given angular step around the perimeter of the measuring disks, two pulse sensors associated with the modulator elements of O) U

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Measuring discs and connected to the corresponding pulse makers, an adder, two frequency-analog converters, a comparator and a comparison unit are entered, and the angular spacing of the modulator elements around the perimeter of the measuring discs is more than twice the angular width of the modulator elements, the output of the first pulse driver is connected to the first input of the adder, to the second input of which the output of the second pulse driver is connected, and through one frequency-analog converter If the output of the first pulse shaper is connected to one input of the comparator unit, to the other input of which through the serially connected comparator and another frequency-analog converter the output of the adder is connected,

The proposed device makes determination of the limiting torque by a contactless method, which allows, unlike the prototype, to avoid introducing into the design of profiled sleeves, open measuring contacts and moving contacts of tokosemniki and thus significantly increase the reliability of the detector. Therefore, the proposed technical solution in comparison with the prototype has significant differences.

FIG. 1 shows a functional diagram of the proposed detector; in fig. 2 is a section A-A in FIG. 1, in the operating state of the detector: in FIG. 3 shows section A-A in FIG. 1 upon reaching the maximum torque value: in FIG. 4 - timing diagrams explaining the operation of the detector.

The limit torque warning device contains (Fig. 1) an elastic shaft 1, at the ends of which base section two measuring disks 2 and 3 are installed with the same modulating elements, for example, toothed ones. In this case, the angular spacing of the modulator elements around the perimeter of the measuring disks is more than twice the angular width of the modulator elements. Two pulse sensors 4 and 5 are located in the immediate vicinity of the disks 2 and 3. The first input of the adder 6 through the pulse shaper 7 is connected to the output of sensor 5. The second input of the adder 6 through the driver of the 8 pulses connected to the output of the sensor 4. The output of the driver of the pulse 8 is connected to the input of the frequency-analog converter 9, the output of which is connected to one im from the inputs of block 10 comparison. Other input block comparison

is connected via a frequency-analog converter 11 and a comparator 12 to the output of the adder 6. The input of the reference voltage to the comparator 12 in FIG. 1 vie is shown.

Extreme Torque Alarm

The moment works as follows.

Before the measurements are started, the measuring disks 2 and 3 are mounted on the elastic shaft 1 so that when the shaft is loaded with the limiting torque, point A on the front edge of the disk during rotation is

3 was located opposite the point B on the back of the tooth 2 of the disk 2 (see 3).

5When rotating shaft 1 loaded

torque below the limit value, the signals from the outputs of the sensors 4 and 5 are fed to the formers 7 and 8 and converted into signals U and Us 9 Fig. 4) which

0 is fed to the inputs of the adder 6, where the / ix addition is performed. At the output of adder 6, a signal Ue appears, which is converted by comparator 12 into a signal Uia. The signals Us and U12, respectively, arrive at clock5, analog-to-analog converters 9 and 11. The voltages generated by converters 9 and 11 are fed to the inputs of comparator block 10. In this case, if the leading edge of the signal U is sent to the processing

0 before the trailing edge of the signal Us (see FIG.

4a, b), which corresponds to the location of the measuring disks shown in Fig. 2, the frequency of the signals Us and U n (see Fig. 4 a. D) is the same, therefore,

The 5 inputs of the comparison unit 10 receive two equal voltages. In this case, there is no signal at the output of the comparator unit 10, which indicates the operation of the alarm device when the torque is lower

0 limit value.

If the leading edge of the signal U arrives at processing after the trailing edge of the signal Us (see Fig. 4 a), which corresponds to the location of the measuring disks, as shown in Fig. 3, the frequency of the signals Ui2 is different from the frequency of the signals U (see Fig. 4 a, e). In this case, two different voltages are applied to the inputs of the comparison unit 10. In that

In the case of the output of the comparator unit 10, a signal appears that indicates the operation of the alarm device with a torque higher than the limit value.

The operation of the detector does not depend on the direction of rotation of the shaft and the application of torque.

The use of the proposed signaling device will allow to register the fact of the occurrence of the limiting torque value and to give a signal to the actuators of the instruments and machines.

Claims (1)

Claims of Invention A torque limit value detector comprising two measuring discs installed at the ends of an elastic shaft and provided with modulator elements placed at a given angular step around the perimeter of the measuring discs, two pulse sensors connected to the modulator elements of the corresponding measuring discs and connected to the corresponding pulse former, characterized in that, in order to increase reliability, an adder is introduced into it, two frequency-a five lot converters, comparator and comparison unit, and the angular spacing of the modulator elements around the perimeter of the measuring disks is more than twice the angular width of the modulator elements, while the output of the first pulse shaper is connected to the first input of the adder, to the second input of which the output is connected the second pulse shaper and through one frequency-analog converter the output of the first pulse shaper is connected to one input of the comparison unit, to the other input of which through serially connected comparators and another frequency-analog converter is connected to the output of the adder. Executive UDrayS / PDA Fig1 FIG. 2 Fkg I I I I Sh at) U12 D, tor. four