Force transducer

FIELD: transportation.

SUBSTANCE: invention relates to methods and devices intended to measure the rolling stock weight in operating conditions without stopping the said rolling stock and in inclined track automatic control systems. The force transducer incorporates a signal processing unit and a sensitive element fitted on the rail and made up of a passive and active parts moving relative to each other, the passive part being fitted directly on the rail while the active one being fitted on a rigid beam mounted on two hinged supports equidistant, along the rail, from the passive part. The aforesaid passive part represents a bush with an inner and outer threads and is fastened, by means of outer thread and nut, in the rail web hole, while the bush inner thread serves to locate a threaded stepwise rod made from a nonmagnetic material accommodating a magnetic material insert on its end face closer to the sensitive element active part. The said insert magnetisation vector is parallel to the measuring rail direction. The sensitive element active part incorporates a magnetic field intensity meter.

EFFECT: higher measurement accuracy.

2 dwg

 

The inventive design of the sensor relates to rail transport, in particular to methods and devices for measuring the power load from the moving wheels on the rail.

A device for measuring the wheel load on the rail (the Publication of the application of the Republic of Belarus No. a "Method for measuring the wheel load on the rail and a device for its realization". Bulletin of the Republic of Belarus No. 1 of 2003), which contains the signal processing unit and mounted on the rail sensing element, which is made of passive and active parts with the possibility of relative movement, and a passive part of the fortified directly to the rail, and the active part mounted on a rigid beam mounted on the rail on the two hinge supports, equidistant along the rail from the passive part of the sensing element.

The operation of the device is to measure the deformation of the rail under load wheels on the measuring section, which measures the difference between simultaneous deformation displacements in the direction perpendicular to the elastic axis of the rail, the three points of the rail - mounting point of the passive part of the sensing element on the rail and half-sum of the geometric deformation displacements of the two points of attachment to the rail hinge supports, which reinforced rigid beam placed on the active part of the sensor element, Kotor is proportional to the wheel load on the rail. The disadvantage of the described device is a low immunity to high frequency shock created by the roughness of the surface of the wagon wheels, and insufficient work time due to rapid wear.

A device for measuring the weight load of the wheels on the rail (the publication of the application RB a "Device for measuring the weight load of the wheels on the rails", Bulletin of the Republic of Belarus No. 2, 2005), containing the measuring rail, the signal processing unit mounted on the measuring rail sensing element is made of passive and active parts with relative movement, in which the passive part of the fortified directly to the measuring rail, and the active part mounted on a rigid beam mounted on the measuring rail on two ball bearing supports, each of the hinge bearings are equipped with a shock absorber rubber katushabe sleeve paired with the axis of the hinge and a rigid beam with a guaranteed fit, and the passive part of the measuring sensor by means of the adjusting screw supports, and a double hinge with mutually perpendicular axes connected with the locking bar mounted on the measuring rail.

The device operates as follows. When the movement of the measuring wheel to the rail on the section between the cylindrical Sha is nirrimi supports the deformation of the measuring rail, causing, by means of the adjusting screw supports, and a double hinge with mutually perpendicular axes, the displacement of the passive part of the sensing element relative to the active part, which is registered active part. The disadvantage of this device is the reduction of measurement accuracy due to mechanical wear of the adjusting screw bearings and the bearings of the double hinge with mutually perpendicular axes.

Closest to the claimed technical solution (prototype) is a device for measuring pressure of a wheel on a rail (Awts of the USSR №742221, BI No. 23, 1980), containing mounted on the rail sensing element with strain gauges and the signal processing unit. The sensing element is designed as put in the fortified in the hole of the neck rail and is made with an inner cone bushing bolt, the conical part of which is elastic jumper of insulating material on which are fixed strain gages, and in the cavity of the head terminal pad connected to the terminals of the strain gages.

The operation of the device is that when moving over the sensitive element of the wheel deforms the rail and the hole in the neck rail, the hole passes the deformation through the grommet on the elastic jumper, and through it on vertically arranged t is noresistance active shoulder measuring bridge, at the output of the signal processing unit measures the voltage, the amplitude of which is proportional to the pressure of the wheel on the rail.

The disadvantage of this device is the low accuracy of the measurements, due to the fact that the active arm measuring bridge, which is located inside the bolt has a small measuring base and low relative deformation of the database.

The present invention is to improve the accuracy of the measurements.

The problem is solved due to the fact that in the known device, containing the signal processing unit and mounted on the rail sensing element is made of passive and active parts with relative movement, in which the passive part of the fortified directly to the rail, and the active part mounted on a rigid beam mounted on the rail on the two hinge supports, equidistant along the rail from the passive part of the sensing element according to the claimed technical solution passive part of the sensitive element is made in the form of a sleeve with internal and external threads, through which the external thread and a nut mounted in the hole in the neck rail, and on the inner thread of the sleeve is fixed to the stem of stepped form with thread made of a nonmagnetic material, having on the end, near to the sensitive ale is NTA, the insert of magnetic material, the magnetization vector which is parallel to the direction of movement of the measuring rail, and the active portion of the sensing element includes measuring the magnetic field strength.

The above construction provides rigidity inserts of magnetic material relative to the measuring rail, mutual movement and interaction of active and passive parts of the sensing element with the minimum number of pairs of friction and wear of parts, than in the aggregate reaches the desired measurement accuracy of the declared load sensor.

Figure 1 shows a General view of the load sensor, figure 2 - cross section along the axis of the fixing passive part of the sensing element to the measuring rail.

Load sensor includes a signal processing unit 1 is connected to the active portion of the sensing element 2 mounted on a rigid beam 3, which is attached to the measuring rail 4 on the two swivel bearings 5. In the cervix measuring rail 4 is fixed by means of nuts 7 sleeve 6 with external and internal thread. On the inner thread of the sleeve 6 is screwed into the stem 8 of stepped form with a thread that has on the end facing the measuring magnetic field strength 10, box 9 of magnetic material is as. The stem 8 of stepped form the thread is locked by the locking nut 11.

Working load sensor as follows. When the motion of a wheel rolling on measuring rail 4 is deflection, rigid beam 3, due to mounting on hinge supports 5, remains straightforward that provides movement of the active portion of the sensing element 2, comprising measuring the magnetic field strength of 10, relative to the insert 9 of magnetic material. Measuring the magnetic field strength 10 generates a signal associated unambiguous dependence with the position in relation to the insert 9 of magnetic material. The signal received from the measuring magnetic field strength 10, is amplified and converted to digital values received in the signal processing unit 1.

The device is implemented in the form of a model the following construction. In the rail-type P65 at the level of the neutral fiber drilled three holes with a diameter of 22 mm, the extreme of which was removed from the medium at equal distance. In the end holes are attached to the pivot bearing 5, for an average of sleeve 6 with internal and external threads of the passive part of the sensing element. On the pivot bearing 5 mounted rigid beam 3, made of a steel channel with a height of 80 mm in the middle of which between shelves is established case the active part of the sensor element 2. The active portion of the sensing element is a measuring instrument of magnetic field on the basis of the Hall sensor with built-in amplifier, and analog-to-digital Converter, the output of which is connected to the signal processing unit. On the spatial orientation of the measuring magnetic field is placed on the continuation of the axis of rotation of the shaft of stepped form with a thread having at the end of the insert of magnetic material.

Tests of a model the load sensor showed the relative measurement error not exceeding 1% at speed wheelset measuring rail from 1 m/s to 5 m/s, and the stability of this indicator during the year of trial operation.

Load sensor containing the signal processing unit and mounted on the rail sensing element is made of passive and active parts with relative movement, in which the passive part of the fortified directly to the rail, and the active part mounted on a rigid beam mounted on the rail on the two hinge supports, equidistant along the rail from the passive part of the sensing element, wherein the passive part of the sensitive element is made in the form of a sleeve with internal and external threads, through which is the current thread and a nut mounted in the hole in the neck rail, and by the internal thread of the sleeve is fixed to the stem of stepped form with thread made of a nonmagnetic material, having on the end, near to the active portion of the sensing element, the insert of magnetic material, the magnetization vector which is parallel to the direction of movement of the measuring rail, and the active portion of the sensing element includes measuring the magnetic field strength.



 

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