STRING DISPLACEMENT TRANSDUCER Russian patent published in 2023 - IPC G01L1/10 

FIELD: electrical measurements of non-electrical values (displacements).

SUBSTANCE: invention can be used in systems for monitoring the technical condition of buildings and structures. A string displacement transducer contains a housing, a measuring element in the form of a string with constant tension, the first movable element, which perceives movement with the help of rods, connected to the first movable tip, made in the form of a hollow cylinder with holes in the ends of the cylinder, in which the string is installed with the possibility of moving along sliding fits, highlighting a section of a string of constant length inside the cylinder (third section). On the generatrix of the cylinder of the first tip in its middle part there is the first converter of the string tension into an electrical signal; the second movable tip is made in the form of a hollow cylinder with a rack-type ratchet mounted on it, the pawl and the clamping spring of which are attached on the sensor body. Inside the second movable tip there is a second movable element, which has the ability to move along the second section of the string of variable length. There is a second converter of string tension into an electrical signal, and the second movable element on the generatrix of the second movable element, located exactly in the middle of the second section of the string of variable length, has a vertical groove that provides free movement in a plane perpendicular to the axis of the string, the first hinge axis of the first pair of movable links equal to length, the second hinge axes of which are respectively located on the body and the second movable tip, forming the first slider. Between the end face of the body and the first movable tip, there is a third movable element that can move along the first section of the string of variable length. There is a third converter of the string tension into an electrical signal on the generatrix of the third movable element. The third movable element, located exactly in the middle of the third section of the string of variable length, has a vertical groove that provides free movement in a plane perpendicular to the axis of the string, the second hinge axis of the second pair of movable links of equal length, the second hinge axes of which are respectively located on the first movable tip and the body, forming a second slider. The second movable tip has holes coaxial with the first movable tip, one of which has a sliding fit that highlights the second working section of the string. The casing is sealed by means of a bellows.

EFFECT: improved accuracy and noise immunity of displacement measurement.

1 cl, 6 dwg