CS265334B1 - Vessel propeller measuring device - Google Patents

Abstract

The solution concerns a device for measuring the thrust of a vessel propeller in a shaft guide. The magnitude of the thrust is determined by measuring the axial force using a measuring element, which is placed between the front side of the outer ring of a radial-axial bearing and the bearing body. The measuring element is in the shape of an annulus with protrusions on both sides. Active strain gauges are placed between the protrusions, which sense the magnitude or formation of the measuring element. Compensating strain gauges are placed on the inner side of the protrusions. The measuring element can be used where it is necessary to register axial forces from a rolling bearing.

Description

265334 2

BACKGROUND OF THE INVENTION The present invention relates to a device for measuring the propulsion of a ship propeller in a shaft-axial radial bearing.

So far known devices have allowed the measurement of the propeller of the vessel only when the vessel is delivered to a measuring device located in the repair yard. The disadvantage of this method of measurement is that it does not allow the in-service load to be measured because the force transducers are located outside the vessel. Stress sensing directly by measuring the force transmitted in the shaft axis is inaccurate because the shafts are dimensioned for transmitting the torque and the compressive load from the axial force is inferior to the other torque and bending stresses. This device is also more complicated as it requires the transmission of the measured quantities from the moving part.

The aforementioned drawbacks are eliminated by the device for measuring the propeller thrust, remaining from the shaft, which is supported in the bearing body by a radial-axial bearing. The essence of the solution is that the ring-shaped measuring element by the protrusions on both sides is located between the face of the outer ring bearing on the side facing the vessel motor and the bearing housing. The measuring member is fixedly connected to the bearing body. The outer and inner diameter of the measuring member is identical to the outer inner diameter of the outer bearing ring. The active strain gauges are located on the side of the measuring member facing the bearing, such that the edge of the projection lying on the side of the measuring member that contacts the bearing body is half-active strain gauge. The compensating strain gauges are located on the inside diameter of the measuring member at the point of the projections.

The main advantage of finding the propeller's thrust with the aid of the vessel bearing measuring member is the ability to measure the in-service thrust. This allows, in conjunction with other variables, to determine the technical condition of the propeller 1 optimized; vessel operation during navigation, which has an impact on fuel economy. A further advantage is that the measuring member is not movable, which simplifies the output signal output to the evaluation device.

Figure 1 shows the location of the measuring member for measuring the thrust in the shaft guide shaft of the present invention. Figure 2 is a front elevational view showing the locations of the strain gauges. Shafts 6 are mounted in the bearing body 6 by means of a radially axial bearing 5. The ring-shaped member J1 with the projections 2 on both sides is located between the face of the outer ring of the bearing 5 and the bearing body 6 on the side of the motor. The bearing body is fixedly connected to the bearing body. The inner and outer diameter of the gauge member JL is coincident with the inner and outer diameter of the outer bearing ring JS. The projections 7 are evenly distributed alternately on both sides. Actively the strain gauges 2 are located on the side of the measuring member facing the bearing 5 such that the edge of the protrusion 2 lying on the side of the measuring member 3, which is in contact with the bearing body 6, is in the middle of the active sensor, that is, at the point of the greatest deflection. The compensating strain gauges 2 located at the inner diameter of the measuring member 11 at the location of the protrusions 2 'are at the point of least deformation. Sealing of strain gauges and their outlets to the evaluation device is sealed against sealant. The propeller thrust causes the axial force transmitted by the shaft 6 radially to the bearing 5 axially into the outer ring of the bearing via the measuring element 11 to the bearing hotel 6 and further into the vessel structure. The measuring member 1 has protrusions 2 regularly distributed over the entire circumference, which allows the axial force of the entire circumference of the stationary outer ring of the bearing to be transmitted. The alternately spaced protrusions 7 on both sides of the measuring member 1 form beams deforming with the acting force. The sum of the deformation increments indicated by the strain gauges 2 versus the rest position is proportional to the transmitted axial force, that is to say, the displacement. The actively strain gauges 2 are located at the point where the linear dependence of the deformed acting force. Calibration of the measuring element JL carried out outside the vessel where the characteristic of the measuring sensor is found is to be corrected in the rest position by the evaluation device of the changes that occur in the bearing so that only the deformation increment is measured which is proportional to the characteristic of the measuring element transmitted. part of the axial force that is

Claims (1)

3 265334 is small and does not affect the result with respect to the accuracy required for the purpose of determining the size of the propeller's propeller due to the bearing bearing being frictionally transferred through the cylindrical portion of the outer bearing ring. The evaluation is performed by a dynamic strain gauge measuring instrument. The measuring element according to the invention can be used in mechanical engineering where the force transmitted by the bearing is to be sensitized. OBJECT OF THE INVENTION A device for measuring the propeller of the propeller, consisting of a shaft which is mounted in a bearing body by means of a radially-axial bearing, characterized in that the annular member (1) with the protrusions (7) on both sides is located on the outer ring of the bearing ring ( 5) on the vessel side of the vessel and the bearing housing (6) to which the measuring element is mounted, wherein the outer and inner diameter of the gauge element (1) is identical to the outer and inner diameter of the bearing outer ring (5), actively the strain gauges (2) are located on the side of the measuring element (1) facing the bearing (5) so that the edge of the protrusion (7) lying on the side of the measuring element (1) which contacts the bearing body (6) is in the middle of the active strain gauge (2) and compensates & the meters (3) are located on the inside diameter of the measuring element (1) at the point of the protrusions (7). 1 drawing