JPH04109134A - Torque meter - Google Patents

Abstract

PURPOSE:To obtain a torque meter which has high durability and can measure torque with high precision by providing a slip ring on the outer periphery of a torque transmission shaft, sticking a distortion gauge on the inner wall face of a hollow section, and connecting them with an inner cable. CONSTITUTION:A torque meter is arranged at the parting section of a drive shaft 1, and a torque transmission shaft 4 is connected between flanges 18a, 18b of the drive shaft 1. An outer ring 12 on the outer periphery of the transmission shaft 4 is prevented from rotating by a rotation catch 11. The inner periphery of the outer ring 12 of the transmission shaft 4 is rotated integrally with the drive shaft 1. Electric power is fed to a distortion gauge 8 via an external cable 15, a brush 14 connected to it, a slip ring 5 kept in contact with it, and an inner cable 10 inserted into shaft 4, thus the power can be fed continuously and stably. The signal detected by the distortion gauge 8 is smoothly extracted to the outside, and it is processed by a processor and measured as the torque of the drive shaft 1. The distortion can be detected under the complete sealing not affected by the outside environment.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a torque meter used to measure the torque of a drive shaft such as a drive system output shaft of a shearing machine.

[Prior Art] Conventionally, this kind of torque meter has a torque transmitting shaft interposed in the middle of the drive shaft a, and a battery C is installed on the outer peripheral surface of the torque transmitting shaft as shown in FIG. Attach a strain gauge d which is supplied with power by the strain gauge d, detect the strain on the outer peripheral surface of the torque transmission shaft with the strain gauge d, and receive the output with an antenna e installed outside the torque transmission shaft, A strain meter-type torque meter that converts it into an electrical quantity using a telemeter f, or
As an example is shown in FIG. 3, gears g and h are fixed at two locations in the middle of the drive shaft 1, and pickup
Electromagnetic detectors) i and 1 are placed facing each other, and the torsion angle generated between the gear housings 1h is extracted as a phase difference by a comparator k based on the two AC voltage signals detected by the pickup LJ. There are known digital torque meters that measure torque by digitally processing the phase difference based on clock pulses.

[Problems to be Solved by the Invention] However, in the case of the above-mentioned strain meter type torque meter, the strain is measured on the outer circumferential surface of the shaft and is easily affected by the external environment, resulting in low reliability. Since it is a spacer arrangement and a slip ring cannot be used, there is a problem that it cannot be used when the battery runs out and has a short lifespan.On the other hand, in the case of the digital torque meter mentioned above, since the teeth of gears g and h are coarse, There is a problem that instantaneous torque cannot be measured accurately.

Therefore, an object of the present invention is to provide a torque meter that is highly durable and capable of measuring torque with high accuracy.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a slip ring on the outer periphery of a torque transmission shaft to be installed in the middle of the drive shaft, and also provides a slip ring for the torque transmission shaft. A hollow part is formed inside the hollow part, a strain gauge is pasted on the inner wall surface of the hollow part, and the strain gauge and the slip ring are connected by an internal cable passed through the torque transmission shaft, and the torque transmission shaft is further connected to the slip ring. An outer ring having a brush provided on the inner wall for contacting the slip ring is fitted onto the outer periphery of the transmission shaft so as to restrict rotation, and the brush is connected to an external cable.

[Function] The strain measurement method is used on the inner surface of the shaft, and the power supply and signal extraction are performed through a slip ring, so measurements can be performed without being affected by the external environment, and it has high durability. be able to.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which a flange 18 on the drive shaft 1 side is attached to one end so that it can be installed in the middle of the drive shaft 1 whose torque is to be measured. A torque transmission shaft 4 is attached to the drive shaft, and a flange 2b is integrally provided on the other end of the flange 2b to be joined to the flange 18b on the drive shaft 1 side. 1 flange 181, 18b
Use it in between. The torque transmission shaft 4 is provided with a slip ring 5 on its outer circumferential surface, and has a hollow portion 7 formed therein through a conduction hole 6 bored from the end surface on the one flange 2a side. A strain gauge 8 is installed on the inner wall surface of the section 7.
At the same time, an amplifier 9 for the strain gauge 8 is installed, and the strain gauge 8 and amplifier 9 are connected to the slip ring 5 by an internal cable IO passing through the torque transmission shaft 4. Further, an outer ring 12 whose rotation is regulated by a rotation stopper II is fitted onto the outer circumference of the torque transmission shaft 4 via bearings 13 installed at both ends, and the inner wall of the outer ring 12 is An external cable 15 is provided with a brush 14 in contact with the slip ring 5, and the brush 14 is guided to the outer wall of the outer ring 12.
The power supply to the strain gauge 8 is connected to the slip ring 5.
The signal from the strain gauge 8 can be taken out to the outside via the slip ring 5. In addition, 16 is a hole 1-1 for partitioning between the hollow part 7 and the conduction hole 6 in the torque transmission shaft 4.
A metic seal 17 is a sealing member for sealing the inside of the outer ring 12. Moreover, 19 is a flange 2 of the torque transmission shaft 4 formed on the flanges 18a and 18b formed at the dividing part of the drive shaft ! , 2b, 20 is the drive gear of the drive shaft l, and 21 is a coupling connecting the drive shaft 1 and the shaft 22 driven by the drive shaft 1.

When measuring the torque acting on the drive shaft I using the torque meter of the present invention configured as described above, the torque meter is placed at the divided portion of the drive shaft 1, as shown in FIG. Flange 2 at one end! 7 to one flange 181 of the drive shaft 1, and the flange 2b of the other end of the torque transmission shaft 4 to the other flange 18b of the drive shaft l.
The connection is made using a flange connection bolt 19, and furthermore, the outer ring 12 on the outer periphery of the torque transmission shaft 4 is prevented from rotating by a rotation stopper 11. Therefore, drive shaft 1. When is rotated by the drive gear 20, the torque transmission shaft 4 is caused to rotate the inner peripheral portion of the outer ring 12 integrally with the drive shaft l.

The torque generated on the drive shaft I due to the above rotation is detected by a strain gauge 8 provided inside the torque transmission shaft 4. At this time, a slip ring 5 is provided on the outer circumference of the torque transmission shaft 4. There is this slip ring 5,
Since the strain gauge 8 is connected via the internal cable IO and the brush 14 connected to the external cable 15 is in contact, power can be continuously and stably supplied to the strain gauge 3. Further, the signal detected by the strain gauge 8 is also smoothly taken out to the outside, processed by a processing device (not shown), and measured as the torque of the drive shaft 1.

As described above, in the present invention, since the strain on the inner surface of the torque transmission shaft is measured to obtain an output equivalent to the shaft torque on the outer surface of the shaft, strain detection by the strain gauge 8 is not influenced by the external environment. The measurement can be carried out in a completely sealed environment, which enables highly accurate measurement over a long period of time, resulting in a torque meter with excellent durability.

It should be noted that the present invention is not limited only to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As described above, according to the torque meter of the present invention, a hollow part is provided in the torque transmission shaft, and a strain gauge is attached to the inner surface of the hollow part, and the shaft torque is measured from the inside of the shaft. This makes it possible to use a slip ring, which allows strain detection to be performed without being affected by the external environment, allowing accurate measurement over a long period of time, and improving reliability and durability. It has excellent effects such as being able to improve performance.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view showing an overview of an embodiment of the torque meter of the present invention, FIG. 2 is a schematic diagram showing an example of a conventional strain measuring torque meter, and FIG. 3 is a conventional digital torque meter. It is a schematic diagram showing an example. l... Drive shaft, 4... Torque transmission shaft, 5... Slip ring, 7... Hollow part, 8... Strain gauge, lO
...Internal cable, 11... Rotation stopper, 12...
Outer ring, 14... Brush, 15... External cable.

Claims (1)

[Claims] (1) A slip ring is provided on the outer periphery of the torque transmission shaft to be installed in the middle of the drive shaft, and a hollow part is formed inside the torque transmission shaft, and the inner wall surface of the hollow part is strained. A gauge is attached, and the strain gauge and the slip ring are connected by a cable, and an outer ring is provided on the outer periphery of the torque transmission shaft and a brush is provided on the inner wall for contacting the slip ring. A torque meter characterized by having a configuration in which the brush is connected to an external cable by being fitted so that rotation is regulated.