CN2273405Y

CN2273405Y - Linear displacement sensor for piston of pressure oil cylinder

Info

Publication number: CN2273405Y
Application number: CN 96219918
Authority: CN
Inventors: 张晓林
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-07-29
Filing date: 1996-07-29
Publication date: 1998-01-28
Anticipated expiration: 2006-07-29

Abstract

The utility model discloses a linear displacement sensor for a pressure oil cylinder piston, which is integrated with light, mechanism and electricity for measuring the opening degree of an arched gate of a reservoir or a hydroelectric station. The utility model is characterized in that one end of a code bar is fixed on one end part of a pressure oil cylinder piston rod, and the other end of the code bar is inserted in a sheath of the code bar; two reflection type photoelectric switches are arranged in a supporting frame of the sheath of the code bar. When the pressure oil cylinder piston rod displaces, the code bar moves together, and the quantity of the code bar can be read by the reflection type photoelectric switches to obtain displacement for further direct and continuous measurement. Since a complicated mechanical transmission device in the prior art is not utilized, the utility model having the advantages of reliable performance, high accuracy and continuous signal is favorable for automatization and closed-loop control.

Description

Oil pressure cylinder piston linear displacement sensor

The utility model relates to a kind of sensing device of the ray machine electricity one of measuring reservoir or power station arc gate aperture, particularly relates to a kind ofly code-bar one end being fixed in the oil pressure cylinder piston rod end is synchronized with the movement with it and read the oil pressure cylinder piston linear displacement sensor that the bar number of codes reflects displacement by reflective photoelectric switch.

The displacement transducer of the reflection arc gate aperture that generally use in current reservoir or power station is made up of control switch, promptly pass through the motion of oil pressure cylinder piston, itself corner is changed, the variation of this corner by the cam rotation of fan type gear driven control switch inside, makes its contact be switched on or switched off the position of reacting arc gate again.This old-fashioned displacement transducer has following deficiency and shortcoming:

One. complex structure, adjust difficult in maintenancely, it is unreliable to move.Control switch is by the mechanical gear transmission, and the cam switch of driving itself moves, and intermediate link is more, and the complicated in mechanical structure that seems is adjusted difficulty, and maintenance workload is big; Also there is the contact oxidation in mechanical contacts itself, contacts labile factors such as unreliable;

Two. measuring error is bigger because the total travel corner of arc gate is bigger by the error of cam driven contact reaction aperture less than 130 degree, generally be difficult to reach error rate 5% with interior requirement;

Three. output signal is discontinuous, is difficult to accurate automatic control, and what control switch was exported can only be interrupted switching signal, can only react the displacement situation in a certain subrange of arc door, therefore can't realize high-precision closed-loop control.

The novel purpose of this use is to use ray machine electricity one body technique, code-bar one end is fixed on the oil pressure cylinder piston rod end, the other end inserts in the code-bar sheath, two reflective photoelectric switches are loaded in the code-bar sheath support, when the pressure piston bar is subjected to displacement motion, related code-bar is synchronized with the movement, can read code-bar quantity by reflective photoelectric switch and learn displacement, oil pressure cylinder piston displacement situation is carried out directly continuous measurement, owing to there is not the complicated mechanical gearing, thereby overcome the shortcoming of above-mentioned prior art, measuring reliability and degree of accuracy to arc gate are greatly improved.

Fig. 1 is the utility model structural drawing;

Fig. 2 is the front profile of code-bar sheath support 5;

Fig. 3 is the side profile of code-bar sheath support 5;

Narrate technology contents of the present utility model below in conjunction with accompanying drawing:

The primary structure of oil pressure cylinder piston displacement sensor has: an end inserts in the code-bar sheath 3 and the other end is fixed on the code-bar 2 of oil pressure cylinder piston rod 8 ends by code-bar fulcrum 6, two reflective photoelectric switches 1 (the two is overlapping) that are placed in the code-bar sheath support 5, code-bar sheath support 4 and 5 is fixed on code-bar sheath 3 on the pressure oil cylinder body 10; When the pressure oil in the cylinder body 10 makes oil pressure cylinder piston rod 8 be subjected to displacement motion, related code-bar 2 is synchronized with the movement simultaneously, two reflective photoelectric switches 1 can be exported the different level of height, thereby read code-bar quantity during by different regional of light and shade on the code-bar 2.The pulse signal of reading transmits by sensor lead 7 and is conveyed in the computing machine 9, thereby reflects displacement.Wherein, two HOA 1406-3 type reflective photoelectric switches that reflective photoelectric switch 1 adopts U.S. Honeywell Inc. to produce, this reflective photoelectric switch is Darlington transistor output, has good, the highly sensitive characteristics of anti-interference; Code-bar 2 is processed into by stainless-steel tube, corrosion processing becomes one to arrange along 12 of axis normal * (square type striped of 2MM～5MM) on the tube wall of Φ 30MM～60MM (different on the length of cylinder body decide), be spaced apart 2MM～5MM between the striped, when moving, code-bar 2 can produce dutycycle like this and be 50% square wave, each code-bar is equipped with installs two reflective photoelectric switches, make its output phase differ A, the B two paths of signals of 90 degree, so that differentiate direction of motion.

Narrate the utility model embodiment below:

At first code-bar sheath 3 is connected with code-bar sheath support 4, code-bar sheath support 5 and is mounted on the pressure oil cylinder body 10, then code-bar 2 one ends that process are inserted in the code-bar sheath 3, the other end uses bolt on code-bar support 6, and a side that makes code-bar up, after relative with reflective photoelectric switch 1 in the code-bar sheath support 5, adjust the installation site of reflective photoelectric switch 1, the distance that makes itself and code-bar is between 5MM ± 1MM.Reflective photoelectric switch 1 links to each other with computing machine or other secondary instruments by lead-in wire 7.When rectilinear motion takes place in oil cylinder piston bar 8, driving code-bar 2 by code-bar fulcrum 6 is synchronized with the movement, when light and dark code-bar 2 process reflective photoelectric switches 1, produce corresponding pulse, this pulse is admitted in computing machine or other secondary instrument and counts, thereby reflects the size of the oil cylinder piston throw of lever.

Advantage of the present utility model and effect are not have complicated intermediate mechanical drive mechanism, the employing reflection type photoelectricity The direct output signal of switch, dependable performance is stable, the accuracy height, when oil cylinder length was 8M, error rate only existed In 0.05%; And signal is continuous, is particularly suitable for computer control system, realizes closed-loop control.

Claims

1. oil pressure cylinder piston linear displacement sensor, mainly by code-bar 2, reflective photoelectric switch 1, code-bar sheath 3 and code-bar sheath support 4 and code-bar sheath support 5 are fixed on that structure forms on the pressure oil cylinder body 10, be primarily characterized in that: an end of code-bar 2 inserts in the code-bar sheath 3, the other end is fixed on the end of oil pressure cylinder piston rod 8 by code-bar fulcrum 6, two reflective photoelectric switches 1 are installed in the code-bar sheath support 5, code-bar sheath support 4 is fixed on code-bar sheath 3 on the pressure oil cylinder body 10 with code-bar sheath support 5, when oil pressure cylinder piston rod 8 is subjected to displacement motion, drives code-bar 2 and be synchronized with the movement.

2. a kind of oil pressure cylinder piston linear displacement sensor according to claim 1, said code-bar 2 is characterized in that adopting stainless-steel tube, becoming width in its surface corrosion is the code channel of 2MM～5MM, the part that is corroded is coated dark paint, and the ratio of making between the length of the diameter of stainless-steel tube of code-bar and oil pressure cylinder piston rod is 1: 100～1: 160.