Device for measuring torque

 

(57) Abstract:

Usage: the torque measurement on rotating and non-rotating shafts during benchmark testing of gearboxes and electric actuators. The inventive device includes an elastic shaft, the labels of the two cross sections of the elastic shaft and corresponding sensors labels, a rotor mounted for rotation around an elastic shaft, the Electromechanical drive of the rotor. Label the first and second sections are located on the rotor, the sensor mark for the first section and the motor of the Electromechanical drive installed with rigid fixation relative to the first section of the elastic shaft, and the second sensor section is installed with rigid fixation relative to the second section of the elastic shaft. 6 C.p. f-crystals, 4 Il.

The invention relates to measuring technique and can be used when measuring torque on a rotating and non-rotating shafts, for example, bench testing of Electromechanical transmission of planetary Rovers.

A device for measuring torque, containing elastic shaft, the label of the first section of the elastic shaft and the sensor mark for the first section, the label of the second section of the elastic shaft and CSOs shaft, the unit of measurement of the time difference or phase difference of the sensor signals of the labels of the first and second sections [1]

The disadvantage of this device is that the accuracy of torque measurement depends on the stability of the angular velocity of the elastic shaft; in addition, the device does not allow to measure torque on the non-rotating shafts.

A device for measuring torque, containing elastic shaft, the label of the first section of the elastic shaft and the sensor mark for the first section, the label of the second section and the second mark sensor section, a rotor mounted for rotation around an elastic shaft, the Electromechanical drive rotation of the labels of the first and second sections, the unit of measurement of the time difference or phase difference of the sensor signals of the labels of the first and second sections, and label the first and second sections are located on the rotor, the sensor marks of both sections and the motor of the Electromechanical actuator is fixed on the fixed base [2]

The disadvantage of this device is the dependence of the accuracy of measurement of torque on a rotating shaft from the stability of the angular velocity of the shaft.

In its technical essence is the device closest to the Declaration shall ysenia precision measuring torque on a rotating shaft.

The difference between the claimed technical solution from the prototype is that the mark sensor of the first section and the motor of the Electromechanical drive installed with rigid fixation relative to the first section of the elastic shaft, and the mark sensor of the second section is installed with rigid fixation relative to the second section of the elastic shaft.

Other differences is that:

the device is equipped with a ball bearing, the first bearing surface of the bearing is fixed relative to the first section of the elastic shaft, and the rotor is fixed relative to the second support surface of the bearing;

on the first and second sections of the elastic shaft fixed stops installed with the possibility of mutual contact when subjected to an elastic shaft loads in excess of its operating range;

the device has a sensor twisting elastic shaft for maximum allowable angle;

patch sensors of the first and second sections made in the form of photovoltaic cells with a light source and a photodetector, the labels of the first and second sections are made in the form of circuit breakers light photoelectric transducers, each breaker light made in the form of soon the x converters are perpendicular to the axis of the elastic shaft;

the breakers of light and the photoelectric converters are arranged so that when the unloaded elastic shaft phase difference signals of the first and second photovoltaic cells is 180 degrees;

the device has a casing covering the photoelectric converters and chopper light, and the breakers of light and the inner surface of the casing provided with a light-absorbing coating.

In Fig. 1 shows a General view of the device for measuring torque in Fig. 2 is a cross-section a-a of Fig. 1, in Fig. 3 section b-B of Fig. 1, in Fig. 4 view In Fig. 1.

Elastic shaft 1 made in the form of torsion, with their slotted shank 2 and 3 is installed on the test device in the chain torque transmission (not shown). On the first shank 2 elastic shaft 1 is fixed to the first housing 4, on the second shank 3 elastic shaft 1 is fixed to the second housing 5. Between buildings 4 and 5 has a bearing 6. The rotor 7 is installed on the housing 4 through bearings 8 coaxially with the elastic shaft 1. On the rotor 7 secured additional cargo 9.

The rotor 7 has a circuit breaker light 10, made in the form of a cylindrical shell with two soo the housing 5 - the photoelectric Converter 14. Each photoelectric Converter includes a light source (led) type AL and a photodetector in the form of a photodiode type FD-256. The transducers 13 and 14 are arranged so that their optical axes are perpendicular to the axis of the elastic shaft 1 plane and in an unloaded elastic shaft 1 are shifted relative to each other by 180 degrees.

On the housing 4 is fixed to the motor 15 DC type DPR-32 and the gear 16, the output shaft of the gear 16 with the gear 17 is kinematically connected with the rotor 7.

The housing 4 has a stop 18, the housing 5 provided with a stop 19 and the sensor twisting elastic shaft 1 at the maximum allowable angle, made in the form of two limit switches 20 type KM1. The stop 18 and the stop 19 is designed in such a way that they come into contact with the elastic twisting of the shaft angle1in one direction and angle 2in the other direction, and angles1and2are the maximum permissible angle of twist of the shaft 1. Limit switches 20 are arranged in such a way that they interact with the stop 18 when the elastic twisting of the shaft 1 by the angle1or angle2< / BR>
The casing 21 is fixed to the housing 4 and is made covering fotoscippo converters 13 and 14, buildings 4 and 5 provided with a light-absorbing coating. On the casing 21 made of an aluminum alloy D16T marks, light-absorbing coating applied by anodic oxidation filled with soot, and the breaker light 10, made of steel grade 40X, light-absorbing coating applied by the method of chemical oxidation with tension. Light-absorbing coating of cases converters 13 and 14, the housings 4 and 5 are completed in the same way.

Photoelectric transducers 13 and 14 through the collector rings 22 are electrically connected with the unit measuring a time offset and / or phase difference of the signals of the transducers 13 and 14, the motor 15 to a power source, type B5-47, and limit switches 20 to the device light and audible alarm (not shown). Unit measuring a time offset and / or phase difference of the signals of the transducers 13 and 14 and the alarm device made according to known principles.

In the described device for measuring torque the installation location of the first housing 4 on the first shank 2 is the first elastic section of the shaft 1, the installation location of the second housing 5 on the second shank 3 second elastic section of the shaft 1, the slit aperture 11 is chick mark for the first section, photoelectric Converter 14 by the mark sensor of the second section.

The operation of the device is as follows.

The voltage from the power source through the collector ring 22 is supplied to the motor 15, which, through the gear 16 with the gear 17 with a constant angular velocity rotates the rotor 7 with breaker light 10 and the diaphragm 11 and 12 relative to the shaft 1.

The constancy of the speed of rotation of the rotor 7 is achieved by the supply voltage constant of the electric motor 15, and the extra cargo 9, acting as a flywheel.

At a certain point in time, the diaphragm 11 intersects the optical axis of the inverter 13, the output of the inverter 13 is formed an electrical signal, which through the collector ring 22 is supplied to the first input unit of measurement. After rotation of the rotor 7 at some angle aperture 12 intersects the optical axis of the Converter 14, the output of the inverter 14 is formed of an electric signal through the collector ring 22 is supplied to the second input of the measurement unit, the measurement unit determines the angle g, which is the phase difference of the signals of the transducers 13 and 14.

Under the action of the elastic shaft 1, the torque is adjusted relative position and the phase difference of the signals of the transducers 13 and 14.

Torque is determined by the formula

Mkr= K and = -about,

where Mkracting on the shaft 1 torque;

To a constant factor determined in the calibration device for measuring torque;

the twisting angle of the elastic shaft 1;

g the phase difference of the signals of the transducers 13 and 14 by the action of the elastic shaft 1 torque;

gaboutthe phase difference of the signals of the transducers 13 and 14 when the unloaded elastic shaft 1.

Under the action of the elastic shaft 1 torque exceeding the operating range of the measurement, the shaft 1 is twisted at an angle1(or 2the stop 18 of the housing 4 is in contact with the stop 19 of the housing 5 and further twisting of the shaft 1 does not occur, thereby preventing the malfunction.

Force arising at the site of contact of the stop 18 with the stop 19, balanced by the force transmitted between buildings 4 and 5 through the bearing 6. This prevents bending of the housings 4 and 5, and the associated shaft 1, which protects the device from damage and improves the measurement accuracy.

Torsional elastic shaft angle1(or2) stop 18 cooperates with a limit switch 20, an electrical signal which chareston, in this time, the device for measuring the torque acting load exceeding the permissible level.

External light is delayed by the casing 21 and is incident on the photodiodes converters 13 and 14. Light LEDs converters 13 and 14 is not reflected from the light-absorbing surfaces of the casing 21, a rotor 7 with breaker light 9, enclosures, inverters 13 and 14, the housings 4 and 5. This prevents the photodiodes converters 13 and 14 of the external light and the reflected light LEDs converters 13 and 14 and increases the immunity of the device.

1. Device for measuring torque, containing elastic shaft, the label of the first section of the elastic shaft and the sensor mark for the first section, the label of the second section of the elastic shaft and the second mark sensor section, a rotor mounted for rotation around an elastic shaft, the Electromechanical drive of the rotor, and the labels of the first and second sections are located on the rotor, characterized in that the sensor mark for the first section and the motor of the Electromechanical drive installed with rigid fixation relative to the first section of the elastic shaft, and the mark sensor of the second section has the same time, it is equipped with ball bearing, the first bearing surface of the bearing is fixed relative to the first section of the elastic shaft, and the rotor is fixed relative to the second support surface of the bearing.

3. The device under item 1 or 2, characterized in that the first and second sections of the elastic shaft fixed stops installed with the possibility of mutual contact when subjected to an elastic shaft loads in excess of its operating range.

4. Device according to any one of paragraphs.1 to 3, characterized in that it has a sensor twisting elastic shaft for maximum allowable angle.

5. Device according to any one of paragraphs.1 to 4, characterized in that the sensor marks of the first and second sections made in the form of photovoltaic cells with a light source and a photodetector, the labels of the first and second sections are made in the form of circuit breakers light photoelectric transducers, each breaker light made in the form of coaxial elastic shaft of a cylindrical shell with a longitudinal slit aperture, and the optical axis of the photoelectric converters are arranged perpendicular to the axis of the elastic shaft.

6. The device under item 5, characterized in that prom Vale phase difference signals of the first and second photovoltaic cells is 180o.

7. The device under item 5 or 6, characterized in that it is provided with a casing covering the photoelectric converters and the breakers of the world, with the breakers of light and the inner surface of the casing provided with a light-absorbing coating.

 

Same patents:

Torsiometer // 2310821

FIELD: measuring technique.

SUBSTANCE: torsiometer comprises two rotors secured to the shaft at a given distance one from the other. The rotors are made of cylindrical nozzles that are coaxial to the shaft. The dielectric clamps are arranged uniformly over periphery along the generatrices of the nozzles. The free ends of the clamps are provided with the permanent magnets. The torsiometer is additionally provided with stator made of two groups of dielectric beams uniformly arranged over the cylindrical surface. The free ends of the beams are provided with the electromagnets mounted for permitting periodic pulse cooperation with the permanent magnets. The fiber optic coils of the interferometer are built in the base of the stator. The fiber coils receive the ends of the stator beams. The output of the interferometer is connected with the recorder through photocurrent amplifier, pulse inverter, and integrator connected in series. When the shaft rotates, the permanent magnets of the rotors periodically cooperates with the electromagnets of the stator. When a torque is generated at the shaft, a signal proportional to the value of the torque is generated at the output of the interferometer.

EFFECT: enhanced precision.

2 cl, 6 dwg

FIELD: electricity.

SUBSTANCE: invention describes a method for tracking the status of the twisted cable, which has a central longitudinal axis. The method comprises the steps of: providing a cable comprising a torsion sensor, extending longitudinally along the cable. Mentioned twisting sensor comprises a single mode optical fibre placed substantially along the central longitudinal axis of the cable, and at least three longitudinal structural element. Furthermore, at least one of the longitudinal structural elements forms a conductive wire. Twisting sensor mechanically connected to at least one of the longitudinal structural elements; measured twisted state mode optical fibre using a polarization-sensitive optical reflectometry and associated cable twisted state along a longitudinal axis with a measured state twisted single mode optical fibre.

EFFECT: tracking the twist during use and providing a reliable measure of the actual placement of the cable, which may be performed periodically.

12 cl, 8 dwg

Up!