JPS5960332A - Output torque monitoring device - Google Patents

Abstract

PURPOSE:To facilitate calibration and signal processing and to take a measurement of output torque with high precision by providing a surface acoustic wave resonator to a flexible beam on a driving shaft, and detecting a resonance frequency difference by utilizing the opposite polarity of strain. CONSTITUTION:When torque operates on the shaft 3 to be measured, rings 4a and 4b shift circumferentially from each other in proportion to the torque and the flexible beam 1 bridged between them deforms by delta, so that surface acoustic wave resonators 6a and 6b stuck where the strain is concentrated vary in resonance frequency. The operating strain is opposite in polarity between drawing and compression, so one increases in resonance frequency and the other decreases. The resonance frequencies are amplified by a transmitter 7 and received by a receiver 9 through antennas 8a and 8b. Those resonance frequencies are mixed together to obtain only the difference in resonance frequency. Electric power for operating the transmitter 7 is supplied successively as a constant voltage by adjusting and applying the voltage from an AC power source 10 to the primary side of a rotary transformer 12 to induce a voltage on the second side and then converting it into the constant voltage through a converter 13. The frequency of the receiver 9 corresponds to only the torque, so it is read to measure the torque which operates on the shaft 3 to be measured continuously with high precision.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method for detecting torque of a driving shaft j-axis.
This is related to the Ruku supervision device.

[Technical background of Hatsuyu]

In iron and paper manufacturing lines, detecting and controlling the torque of the drive shaft of each stand is essential in terms of confining products. Conventionally, this Yuzu axis torque detection force type (using a strain gauge, the slip ring method was avoided due to maintenance difficulties in extracting signals from the rotating part, a transmitter was installed in the rotating part, and t'e was used. The telemeter system is often used. However, the S/P meter system is
The N (signal/a ratio) is probably 40dI3L (,
[Objective of the Invention] The present invention was made in view of such 4↓ pleasure, and it is a method for monitoring The purpose is to provide a device 1'.

[Summary of Hatsutsu]

That is, in order to achieve the above object, the present invention has a flexible beam for detecting the torsion of the shaft by leaning on the axis of the drive shaft to be measured. A pair of surface acoustic wave resonators are installed at a distance of 1 tM, and the resonant wave number of these surface acoustic wave resonators is set so that the deflection of opposite polarities in this flexible beam is caused by the M-noise. A + stage is provided to obtain the frequency of the difference between both 4r = numbers, and from this frequency U, the 1st axis of the 1st axis of the measurement target is
This is to measure sleeve torque, and when a flexible beam is deformed by the shaft torque of the 6% 11 constant target drive shaft, this deformation is a deflection deformation with opposite polarity and 1. [Using this fact, we extract the resonant frequency in this irregular valley surface acoustic wave resonator, and control the fvj torque (from the difference between the two resonant frequencies) to measure the 11Y drag. It can be so.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention shown in FIGS. 1 and 2 will be described. 1 is a flexible beam 2, which is made of two-part T14 structure with both ends capable of being removable, and is fixed to two points D in the longitudinal direction on the shaft 3 to be measured by bolts 2. It is fixed with bolt 5.

The flexible beam I is provided with a cutout near both fixed parts for the purpose of reducing the reinforcing effect that appears in the torsional direction of the fixed axis 3 of the dllJ and concentrating strain in this part, and the outer surface of the cutout is Surface acoustic wave resonators 6a and 6b whose resonant frequency changes in proportion to the strain applied are attached.The assignment of frequency changes of these surface acoustic wave resonators 6a and 6b, that is, the amount of frequency change ΔJ゛ and the original frequency J The ratio (Δj'
/f) is the strain, 1-the ratio of the straw deformed length Δl to the original length l (ΔI!/'7), PI: h: Ship Shiku;
j"+=100hThe numerator in the case of the gold-burr foil strain gauge is as follows: Δf reaches 1 gQ
, and surface 5.''11 Suminami Co. J Tatsuko 6a.

6b is connected to the transmitter 1, 1\J7, and from this the transmitter (M antenna '8a) comes out.The receiving antenna 8b, which is installed opposite the transmitting antenna 8a, is connected to the receiver 9. On the other hand, the transmitter 7 is turned on to the silent capital mL box: (
A converter I3 is connected to the rotary transformer 12 via the voltage regulator II from fij', 10, and to the inverting side of i01, which converts the AC power transmitted through the R+ contact to a constant voltage of η1.

The transmitter 7, the transmitting antenna Ha, the secondary side of the rotary transformer 12, and the converter I3 provided in the rotary transformer 71SI 4 are fixed so as not to fly by 1N with a recoil force of 2.

Next, the operation of the shaft torque monitoring device for misfiring ψJ configured as described in 5 above will be explained. When torsion acts on the fixed axis 3 of the 6111, a relative displacement occurs between the rings 4a and 4b in the circumferential direction in proportion to the torsion. tT''z As shown in Figure 3, the surface acoustic wave resonator 6a is deformed by δ and is connected to the part where the strain is most concentrated.

The resonance frequency of 6b changes. At this time, as shown in FIG. 3, the surface acoustic wave resonator 6a is attached to the side surface of the flexible beam I by deformation.

Since the polarity of the strain acting on 6b is 611, the tensile strain J is T, and the rear field is the specific axial strain P, so the resonant frequency becomes quotient in the case of - force, but becomes lower in the other case. . The resonance frequency 1 corresponding to this torque is amplified by the transmitter 7 and transmitted to the antenna 8a.

8b and is received by receiver 9. The receiver 9 mixes the respective resonance frequencies and extracts the difference 3- between the frequencies of the two frequencies. For this reason, the surface acoustic wave resonators 6a, 6
The change in resonance frequency due to the temperature change b and the bending of the shaft 30 to be measured is 6a.

Since they are almost equal in 6b, they are eliminated. On the other hand, the power that operates the transmitter 7 is the voltage of the AC power supply 10.
In addition to the primary VT++ of the rotating transformer 12, the secondary side which is the rotating side is caused to have a constant 1 by the converter 13.
(1, 1''-IJii) and is continuously supplied.

Accordingly, the frequency indicated by ``C'' corresponds only to torque, so reading this corresponds to the frequency being measured.
The torque acting on 3 is applied continuously with precision.

In addition, the present invention is described in Example 111 (not limited to the above), but the shape of the flexible beam is hollowed out so that only υ・1 is concentrated in the part where the surface acoustic wave resonator is pasted. The seed vat can be modified to a circular shape or other shape, or to a U-shaped one, as long as the suction is not changed.

〔Effect of the invention〕

As explained above, the present invention includes a flexible beam on the axis of the drive unit 11i11 that detects the four return of the offer, and the rhombic shape of this flexible beam is placed at different positions that are easy to receive. The same surfaces 51i'-t, I: 7w resonators are provided, and the drive! ++Using the fact that the polarity of the force received by the flexible beam becomes opposite due to the axial torque of the # axis, the resonant frequency of both surfaces 'j'l'Fi= e is the same wave number corresponding to the torque as the resonant frequency of the resonator. This resonant frequency difference is detected by using the difference that occurs, and from this it is determined that the torque is constant. -j gauge, at least 10 times the resolution n compared to the telemeter method?t < , t L-
C. Since the torque signal is divided by one frequency, it is easy to process the signal using a digital circuit, and it is easy to measure shaft torque with high accuracy.
t4B <Since you can choose, the transmitter circuit can be used as a carrier wave when transmitting the projection output of the resonant frequency wirelessly, so the transmitter circuit is simple (111). It is possible to provide a simple shaft torque monitoring device with a resolution of t, 1.1, which is easy to calibrate through an equivalence test because it has a high degree of decoupling ability for the target drive shaft.

[Brief explanation of the drawing]

Figures 1 and 2 are a schematic diagram showing an embodiment of the present invention α), and a 1□-illustration diagram of the third evil eye torsion variation.

Claims (1)

[Claims] A flexible beam for detecting torsion of the shaft can be obtained by bending its IItl line to the drive shaft to be measured, and a position where it is easy to receive strain deformation of opposite polarity in this flexible beam due to the deviation of the drive shaft to be measured. A pair of surface acoustic wave resonators are provided in the surface acoustic wave resonator, and a means is provided for receiving the resonance frequency signals of these surface acoustic wave resonators to obtain a frequency difference between the two signals. +lqi+) torque 611].