RU5646U1 - DEVICE FOR POWER MEASUREMENT - Google Patents

Abstract

A device for measuring the force, comprising an intermediate transducer, an active element, a measuring probe, an excitation unit, a measuring unit and an indicator, characterized in that the active element is made in the form of a ring of magnetoelastic material, and the measuring probe is made in the form of two perpendicular to each other and the axis of the probe magnetic circuits with excitation and measurement coils, and during the measurement, a measuring probe is installed inside the ring.

Description

Force Measuring Device

The utility model relates to the field of instrumentation and can be used in measuring force.

Known devices for measuring force, containing an intermediate transducer, an active element in the form of load cells, an excitation unit, a measurement unit and an indicator (1). A disadvantage of the known devices is the low sensitivity of the load cells, the need for wired communication between the load cells and the excitation and measurement unit (which significantly reduces the reliability and explosion safety of devices when working in explosive atmospheres).

A device for measuring force is known, comprising an intermediate transducer, an active element, a measuring probe (sensor), an excitation unit, a measurement unit, and an indicator, while magnetoelastic material is used as the active element (2). In the known device, the primary signal is removed using special coils wound on a core of magnetically elastic material. A disadvantage of the known device is the need to use wired communication between the active element and the excitation and measurement unit, which leads to a decrease in the reliability and safety of the device when working in explosive atmospheres, especially in conditions of constant movement of the measured object.

The utility model is aimed at improving reliability and safety when working in explosive atmospheres.

This is achieved by the fact that in a device containing an intermediate transducer, an active element, a measuring probe, an excitation unit, a measuring unit and an indicator, the active element is made in the form of a ring of magnetoelastic material, and the measuring probe is made in the form of two magnetic cores perpendicular to each other and the axis of the probe with excitation and measurement coils, moreover, during measurement, the measuring probe is installed inside the ring.

The essence of the utility model is illustrated by drawings, where in FIG. 1 shows the proposed device, in FIG. 2 shows the possible position of the measuring probe during the measurement; FIG. 3 shows a use case of the proposed device.

The figure 1. shows the proposed device.

The device for measuring the force contains an intermediate transducer 1, which receives the force P and is coupled to the active element 2, a ring of magnetoelastic material, in which a measuring probe 3 is installed, consisting of two magnetic circuits 4 and 5 with the excitation coil 6 and measurement coil 7 wound on them, moreover, the excitation coil 6 is connected to the excitation unit 8, and the measurement coil 7 is connected to the measurement unit 9 and the indicator 10 connected in series.

The device operates as follows. At the time of measurement, the measuring probe 3 is inserted into the active element 2 - a ring of magnetoelastic material. The excitation unit 8 generates an excitation current flowing along the excitation coil 6 of the measuring probe 3 and creates an electromagnetic field that magnetizes the inner surface of the active element. As a result of the action of the external force P, the deformation of the active element 2 occurs, as a result of which the magnetic characteristics change

material of the ring in sections A, B, C, D, which leads to the appearance of a magnetic field in the magnetic circuit 5, as a result of which a signal appears in the measuring coil 7, which is directly proportional in amplitude and phase to the magnitude and direction of the external force P. Next, the signal with the measuring the windings 7 of the measuring probe 3 goes to the measuring unit 9 and then to the indicator 10. The proposed device has a detuning from the influence of the gap between the inner surface of the active element 2 and the ends of the magnetic circuits 4 and 5. The specified detuning concludes I'm next. As a result of the inaccuracy of the installation of the probe 3 inside the active element 2, a change in the air gap is possible (up to 20 microns - differences in diameters). But since the increase (decrease) of the gap on one side K, L causes a corresponding decrease (increase) on the diametrically opposite side of M, H, the total gap and, accordingly, its magnetic resistance remain almost unchanged. The stability of the magnetic resistance leads to the stability of the electromagnetic field of the excitation (the excitation current is maintained by a stable excitation block) and, accordingly, to the detuning from the gap. In the specified device there are no any wire connections between the active element 2 and the measuring probe 3. The interaction between them occurs using an electromagnetic field. The specified factor leads to increased reliability and explosion safety of the device when working in explosive atmospheres. Since the device has a detuning from the gap between the active element 2 and the measuring probe 3, the measurement accuracy is maintained at the level of the prototype.

The analysis of the prior art by the applicant, including a search by patents and scientific and technical sources of information, made it possible to establish that the applicant did not find a source characterized by features.

at

identical to all the essential features of the claimed utility model. The determination of the identified analogues of the prototype allowed us to establish a set of significant distinguishing features in relation to the technical result perceived by the applicant in the claimed device, set forth in the formula. Therefore, the claimed utility model meets the condition of novelty.

The specified device was used in a portable dynamometer system of oil rigs when measuring the force (force) arising from the translational-reciprocal movement of the string of pump rods. Oil pumping machines were equipped with intermediate elements 1 (with built-in active elements 2) installed between traverses 3 (Fig. 3). The error in measuring the force was less than 1.6% in the range of operating temperatures from - 40 ° C to + 45 ° C. During the test, increased reliability of the device was noted in terms of resistance to clearance, traces of dirt, traces of oil and oil products. The proposed device can be used in various critical structures (bridges, cranes, shaft supports, etc.) to quickly determine the levels of loads and stresses. Given the low cost of an active transducer, the cost of force measuring equipment is low. The applicant intends to equip all of his fields with the proposed devices (about 2000 wells) at the rate of 300 active converters per 1 set of electronic units.

1.Ash J. et al. Sensors of measuring systems: In 2 books. Kn.2., M., Mir, 1992, S.41-54.

2. Tverdin L.M. etc. Automatic devices with magnetoelastic converters. M., Energy, 1974, p.6-7. AUTHORS: - / - if A.G. Tsypushtanov K.E. Eliseev A.A. Istomin D.I. Fozekosh

Claims (1)

A device for measuring the force, comprising an intermediate transducer, an active element, a measuring probe, an excitation unit, a measuring unit and an indicator, characterized in that the active element is made in the form of a ring of magnetoelastic material, and the measuring probe is made in the form of two perpendicular to each other and the axis of the probe magnetic circuits with excitation and measurement coils, and during the measurement, a measuring probe is installed inside the ring.