SU329418A1 - DENSITY SENSOR - Google Patents

Description

The invention relates to the field of metrology, namely, sensors for measuring non-electrical quantities by an electric method.

Load bearing strain gauges are known that contain a cargo-carrying unit in the form of a spherical element supported on a cylindrical liner associated with a membrane elastic element placed in a housing with racks on which glue-free strain gages are placed. These sensors do not provide the required measurement accuracy for lateral loads and tilting torques.

The proposed load-bearing strain gauge differs from the well-known one in that in an elastic element, along the axis of symmetry, there is a cylindrical groove to the neutral plane, with the end of which is in contact with the insert transmitting the measured load, and in the elastic element, in the Heii plane of the rim, holes are made in which the supporting balls are placed, placed in the sockets of the intermediate ring, reinforced in the housing. This reduces the influence of lateral loads and tilting moments on the measurement accuracy and stabilizes the elastic element relative to the body.

The elastic element / (of the plate type) has the insert 2 in the center, which is connected with the elastic element in the neutral plane by the lower spherical ring. The measured load is transmitted through the spherical element 3 to the liner 2 and further to the elastic element. Along the rim of the latter, in the neutral plane, are the supporting balls 4, which are recessed in one side

holes 5 on the elastic element, and the other in the nromel nest of the weft cage 6. The height of the intermediate cage installed in the root of the 7 is inversely proportional to half the thickness of the plate and in total with it is a constant value.

The larger the load on the sensor is calculated, the greater must be the thickness of the ilastina (a single element) and the smaller the height of the intermediate cage in order to create the sum of these quantities; then the remaining parts included in the sensor can be unified.

The placement of the support balls and the application of the measured force in the neutral plane provide stability and a healthy sensor at any orientation in space.

The sensor works as follows. The measured force through the spherical elet / in the neutral plane n causes the corresponding deflection of the plate. At the lower end of the plate there are radially arranged cantilever racks 8, over which wire strain gauges 9 are wound. Depending on the size of the plate, the cantilever pillars 8 are diverted by a certain angle and stretched to the flexible wire. The magnitude of the deformation of the wire also depends on its location on the racks - the more distal the end of the plate end is, the greater the deformation of the wire, the more severe the strain they will be. Varying the arrangement of threads on cantilever racks, it is possible to use the same elastic element to measure different loads. The reduction of the impact of the tilting momeite is ensured by bringing the support of the elastic element and the point of application of the measured force to the neutral plane. The exclusion of the axial displacement of the elastic element relative to the body is ensured by the dimensions 1, the envelope of the supporting bolts and the rim of the elastic element in the non-circular () plane.

PRIORITY

Those 1.Silopzmeritelny) 1zodatchik comprising gruzonrpemny assembly as sferncheskogo elemepta, opirayup1egos on tsiliidrichesky liner associated with the membrane placed in the housing uprugnm element with racks, which are arranged glueless gages, characterized in that, in order to reduce the effect of side loads and ontriding moments on the measurement accuracy, in an elastic element, and on the axis of symmetry, is a cylindrical tube to the neutral plane, with the end of which is in contact with the liner transmitting the measured signal ZKU.

2. Teodonizator io p. 1, characterized in that, in order to stabilize the augurine element, the body, in an elastic element, in the neutral plane but the rim, is made of lungs, in which the onboard nifncans are placed, placed in the lines of the intermediate ring, reinforced in the body.