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CN-116753886-B - Automatic compensation pull rope encoder

CN116753886BCN 116753886 BCN116753886 BCN 116753886BCN-116753886-B

Abstract

The invention provides an automatic compensation stay cord encoder, which belongs to the technical field of stay cord encoder signals and comprises a single-row measuring wheel wound with a stay cord, wherein the other end of the stay cord is connected with an elastic compensation piece, the elastic compensation piece is connected with a target object to be measured, one end of a rotating shaft of the measuring wheel is connected with a deformation piece, the other end of the rotating shaft of the measuring wheel is connected with a rotary encoder, deformation energy storage occurs in the measuring process, when the target object to be measured is close to the measuring wheel, the deformation piece drives the measuring wheel to reversely rotate to recover the stay cord, the rotation of the measuring wheel drives the rotary encoder to rotate, and distance measurement is achieved, and elastic force generated by deformation of the deformation piece is equal to elastic force generated when the elastic compensation piece pulls the stay cord, so that errors caused by the fact that a winding circle of the stay cord on the measuring wheel is reduced are compensated. The invention reduces the lamination error caused by multi-winding in the existing stay cord encoder by using an automatic compensation mode, has simple structure, hardly influences the volume and manufacturing cost of the sensor, and improves the precision of the stay cord encoder.

Inventors

  • ZHANG YUMEI
  • ZHENG WEI

Assignees

  • 北京交通大学

Dates

Publication Date
20260512
Application Date
20230616

Claims (9)

  1. 1. An automatic compensation pull-cord encoder, comprising: a measuring wheel (2) wound with a pull rope (1) in a single row, wherein the other end of the pull rope (1) is connected with an elastic compensation piece (3), and the elastic compensation piece (3) is connected with a target object to be measured; One end of the rotating shaft of the measuring wheel (2) is connected with the deformation piece, the other end of the rotating shaft of the measuring wheel (2) is connected with the rotary encoder (5), When the object to be measured is close to the measuring wheel (2), the deformation piece drives the measuring wheel (2) to reversely rotate to recover the pull rope (1), and the rotation of the measuring wheel (2) drives the rotary encoder (5) to rotate so as to realize distance measurement; the elastic force generated by deformation of the deformation piece is equal to the elastic force generated when the elastic compensation piece (3) pulls the pull rope, and the elastic compensation piece (3) compensates errors caused by the fact that the winding of the pull rope on the measuring wheel (2) is reduced; let the elastic coefficient of the deformation member be The diameter of the measuring wheel (2) is D, the diameter of the pull rope (1) is D, the circumference of the pull rope (1) wound on the measuring wheel (2) is C, and the pulling force on the pull rope (1) is F; The elastic force of the deformation piece changes into every time the stay cord (1) is pulled out one circle: ; The elastic coefficient of the elastic compensation piece (3) is compensated by the stress deformation of the elastic compensation piece (3) and the error caused by the lamination of the pull rope (1) in the measuring process The method comprises the following steps: 。
  2. 2. The automatic compensation stay cord encoder according to claim 1, wherein the measuring wheel (2) is arranged in the housing (6), and both ends of the rotating shaft are rotatably extended out of the housing (6) and are respectively connected with the deformation member and the rotary encoder (5).
  3. 3. The automatic compensation stay cord encoder according to claim 2, characterized in that a guiding pulley (7) is rotatably arranged in the housing (6), and one end of the stay cord (1) is extended out of the housing (6) after bypassing the guiding pulley (7) and is connected with the elastic compensation member (3).
  4. 4. The self-compensating pull-cord encoder of claim 3, wherein the deformation member is a planar spiral spring.
  5. 5. The automatic compensation stay cord encoder according to claim 4, wherein a scroll spring box (8) is arranged on one side of the housing (6), the plane scroll spring is arranged in the scroll spring box (8), one end of the plane scroll spring is connected with the rotating shaft, and the other end of the plane scroll spring is connected with the scroll spring box (8).
  6. 6. The self-compensating pull-cord encoder according to claim 2, characterized in that the rotary encoder (5) is connected to the housing (6).
  7. 7. The automatic compensation stay cord encoder according to claim 2, characterized in that a through hole (9) is provided on the housing (6) for the stay cord (1) to extend out and connect with the elastic compensation member (3).
  8. 8. The automatic compensation stay cord encoder according to claim 1, wherein two ends of the elastic compensation piece (3) are respectively connected with a first connector (10) and a second connector (11), the stay cord (1) is connected with the first connector (10), and the second connector (11) is connected with the object to be measured.
  9. 9. The automatic compensation rope encoder according to claim 8, characterized in that the elastic compensation element (3) is a tension spring.

Description

Automatic compensation pull rope encoder Technical Field The invention relates to the technical field of stay cord encoders, in particular to an automatic compensation stay cord encoder. Background The stay cord encoder is also called a stay cord displacement sensor, a stay cord electronic ruler and the like. The linear displacement sensor fully combines the advantages of the angle sensor and the linear displacement sensor, and has the advantages of compact structure, long measurement stroke, high measurement precision, reliable performance and low cost. The stay cord encoder is mainly applied to measurement of relevant dimensions and control of positions such as linear guide rail systems, hydraulic cylinder systems, telescopic systems, hollow bottle blowing machines, IT equipment, tension adjustment, high-speed automatic feeders, speed adjustment, storage position positioning, pressure machines, papermaking machines, textile machines, sheet metal machines, paper product packaging machines, printing machines, level controllers, construction machines, gate opening degree measurement and the like, is also widely applied to screen display and digital display systems of the testing machine industry, and has considerable prospects. The pull-cord encoder can detect and measure linear position and velocity by utilizing a flexible pull cord and a spring-loaded spool. The sensor mainly comprises four main parts of a measuring rope, a spool, a spring and a rotary sensor, wherein the working principle is that a stainless steel stay rope is wound on a straight cylindrical spool which is precisely processed and can be used as a measuring stay rope reel and an unwinding reel, the spring is coupled to the spool for maintaining the tension of the stay rope, the spool is coupled to a shaft of the rotary sensor (an encoder or a potentiometer), the spool and the sensor shaft rotate due to the fact that the stay rope of the sensor extends along a movable object, and an electronic signal proportional to the linear extension or the speed of the stay rope is generated by a rotary shaft. The common stay cord encoder in the existing market is the coaxial design mode of encoder rotation axis and reel, because the reel is wider than wire rope, wire rope can appear irregular lamination phenomenon on the reel, increases along with the wire winding, and wire radius still can produce undulant on tending to the basis of increase to influence wire winding girth, thereby lead to measuring error. The adoption of the measuring mode of the driven layer can avoid a plurality of windings, but the whole volume and cost of the sensor are increased remarkably. Disclosure of Invention The invention aims to provide an automatic compensation stay cord encoder, which controls a steel wire rope to be wound along a variable-diameter spiral line track in a single row by arranging a measuring wheel with a certain winding groove width, and simultaneously combines a tension spring arranged at a rope head part to compensate errors caused by winding change of the steel wire rope, so as to eliminate winding lamination errors by combined action, thereby solving at least one technical problem in the prior art. In order to achieve the above purpose, the present invention adopts the following technical scheme: the invention provides an automatic compensation stay cord encoder, comprising: The measuring wheel is wound with a pull rope in a single row, the other end of the pull rope is connected with an elastic compensation piece, and the elastic compensation piece is connected with a target object to be measured; one end of the rotating shaft of the measuring wheel is connected with the deformation piece, the other end of the rotating shaft of the measuring wheel is connected with the rotary encoder, When the object to be measured is far away from the measuring wheel, the elastic compensation piece pulls the pull rope to drive the measuring wheel to rotate so that the deformation piece deforms and stores energy; when the object to be measured is close to the measuring wheel, the deformation piece drives the measuring wheel to reversely rotate to recover the pull rope; the elastic force generated by deformation of the deformation piece is equal to the elastic force generated when the elastic compensation piece pulls the pull rope, and errors caused by the fact that the winding of the pull rope on the measuring wheel is reduced are compensated. Preferably, the elastic coefficient of the deformation piece is K 1, the diameter of the measuring wheel is D, the diameter of the pull rope is D, the circumference of the pull rope wound on the measuring wheel is C, and the pulling force on the pull rope is F; Every time the stay cord pulls out one circle, the elasticity of deformation spare changes into: AF=C*K1; Through the atress deformation of elastic compensation spare, compensate the error that the stay cord stacks up and bring in the measurement process, then elastic co