RU133925U1 - COMPLEX FOR TORQUE MONITORING, AXIAL STOP FORCES AND ANGULAR SPEED ON ROTATING SHAINS - Google Patents

Abstract

A complex for monitoring torque, axial thrust forces and angular velocity on rotating shafts, containing axial force and torque tensometric bridges mounted on the propeller shaft along the axes of the corresponding main stresses, speed indicator, data recording and processing unit, characterized in that the signal from the rotating shaft is transmitted through the radio channel using a radio transmitter and provides data exchange with the ship’s server and through it with standard systems with udna.

Description

The utility model relates to the field of measurement technology and can be used to measure axial forces and torque on the propeller shafts of ships.

The most common way to evaluate the power developed by a ship’s power plant is currently to control the fuel consumption of the power plant and recalculate it into developed power by the coefficients obtained at the manufacturer. This method is quite approximate, since the conversion factor substantially depends on the correct adjustment of the fuel supply in the power plant and its operation mode.

A device for measuring the axial force and torque of the propeller of a vessel with tensometric bridges mounted on a rotating shaft and connected to a measuring bridge, a current collector with sliding brushes, amplification-measuring equipment and a power source located stationary on a stationary object (patent No. 21115900 FSUE TsNII named after academician A.N. Krylov "1998) - a prototype.

The disadvantages of the known device is the need to manufacture a large number of slip rings for transmitting information for various diameters of the propeller shafts, which limits the capabilities of the device when testing modern ships and ships. For large-capacity fleets, shaft diameters exceed 0.5 m, and for nuclear icebreakers and special vessels, shaft diameters are up to 1.1 m. Current collector designs for such shafts become extremely bulky, metal-intensive and very heavy. These disadvantages are especially apparent when transporting such current collectors and mounting them on a propeller shaft.

The proposed utility model of the complex for monitoring torque, axial thrust forces and angular velocity on rotating shafts is a device for measuring axial forces and torque on the propeller shafts of ships of various types and purposes. In ship's conditions, and especially with a limited extent of the free surface of the shaft, the creation of devices using a radio channel for transmitting information becomes relevant. To this end, a radio transmitter with frequency modulation of the signal is used in a complex for signal collection from a rotating shaft.

To determine and record the current values of the axial thrust force and torque in the developed measurement systems, it is proposed to measure the compressive and torsional strain of the shaft shaft section transmitting the axial thrust force and torque. To increase the measurement accuracy of the created system for measuring the axial force of the stop, the system provides an additional measurement of the displacement (tipping) of the upper part of the main thrust bearing housing relative to the basic housing structures. Such displacements are of sufficient value for their reliable registration by measuring equipment and are proportional to the axial force of the stop acting in the shaft line.

The main objective of the complex is to increase the reliability and reliability when measuring the instantaneous values of the torque transmitted by the shaft drive to the propeller, and the axial thrust of the propellers with simultaneous measurement of the shaft speed.

The basis of such a complex is the principle of measuring the twisting of the shaft line using strain gauge bridges, followed by the transmission of the measured signal from the rotating shaft via a radio channel to the signal recording and processing unit.

The figure 1 presents a schematic drawing of a complex for monitoring the torque and axial stop forces transmitted by the shaft to the propeller, as well as measuring the shaft speed. The complex consists of mobile I and stationary II parts, including the following elements:

Moving part (I) mounted on a rotating shaft:

- tensometric bridge (1) mounted on the propeller shaft along the axes of the corresponding main stresses,

- radio transmitter (2),

- power supply (3),

- transmitting antenna (4).

Stationary part (II) installed in a place convenient for the operator:

- receiving antenna (5),

- a receiver of frequency modulated signals (6),

- speed indicator (7),

- laser sensor (8),

- unit for recording and processing signals (9).

The complex works as follows.

When the propeller shaft rotates, axial force and torque develop on it, deforming the shaft. The strain gauge bridges mounted on the shaft (1) change their resistance and unbalance voltages arise in their diagonals, which are fed to the input of the radio transmitter (2). For the operation of the radio transmitter, a power supply unit (3) is connected to it with a battery life of 10 hours. An amplified and frequency-modulated signal from a radio transmitter is transmitted to a transmitting antenna (4) and via a radio channel to a receiving antenna (5) connected to a receiver of frequency-modulated signals (6), where the received signal is decoded and fed to the input of the signal recording and processing unit (9 ) The signals proportional to the rotational speed come from the pulse revolution indicator (7) and the displacement of the thrust bearing housing from the laser displacement sensor (8). The signal recording and processing unit (9), using the calibration coefficients entered into it, calculates the values of the axial stop force, torque and shaft speed, displays the obtained values on the monitor screen in the form of a graph, and also stores the obtained values on its magnetic carrier.

The figure 2 presents a General view of the equipment mounted on the shaft and included in the complex for monitoring the torque and axial stop forces transmitted by the shaft to the propeller, as well as measuring the shaft speed.

In addition, the signal recording and processing unit (9) has the ability to receive and transmit data from the ship’s server and communicate through it with other measuring systems as well as with the ship’s standard systems.

Thus, with the help of a complex for monitoring torque, axial thrust forces and angular velocity on rotating shafts, a solution to the problem of increasing the reliability and reliability of measurements in difficult ship and ship conditions is realized with a limited length of the shaft surface allocated for the placement of measuring equipment.

Claims (1)

A complex for monitoring torque, axial thrust forces and angular velocity on rotating shafts, containing axial force and torque tensometric bridges mounted on the propeller shaft along the axes of the corresponding main stresses, a speed indicator, a data recording and processing unit, characterized in that the signal from the rotating shaft is transmitted through the radio channel using a radio transmitter and provides data exchange with the ship’s server and through it with standard systems with udna.

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