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External displacement sensor

A displacement sensor and outer sleeve technology, applied in the direction of fluid pressure actuating devices, etc., can solve the problems of shortened sensor life, large downtime, and displacement sensor damage, achieve high detection accuracy and response frequency, and meet the needs of position control. , the effect of prolonging the service life

Active Publication Date: 2013-01-30
CHINA NAT HEAVY MACHINERY RES INSTCO
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the eccentric load of the oil cylinder causes the piston to tilt during the working process, the sensor core (magnetic scale) will be bent and deformed, resulting in a decrease in measurement accuracy and stability. Long-term work will cause the iron core (magnetic scale) to be in contact with the measuring rod ( Magnetic head) contact wear, the life of the sensor is greatly shortened; in addition, when the displacement sensor is being maintained or replaced, it is necessary to stop the oil supply to the oil cylinder, and then replace it after disassembling the oil cylinder. detection, causing a lot of downtime
[0004] For the externally installed displacement sensors that are rigidly fixed on the cylinder body and the piston through the brackets, the working environment of the servo cylinder in the metallurgical production process is usually relatively harsh. Factors such as dust, water vapor, and oil leakage usually cause the displacement sensor with simple protection to frequently fail. Normal damage, it is also difficult to meet the high response frequency requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1 is a schematic diagram of the installation of a LVDT type linear displacement sensor.

[0018] Such as figure 1 As shown, a kind of external displacement sensor, comprises: linear bearing 6, outer sleeve 7, spring 8, slide guide rod 4, displacement sensor measuring rod 19 and moving sleeve 17, displacement sensor measuring rod 19 is in sliding guide rod 4 Inside, the sliding guide rod 4 is inside the outer sleeve 7, the sliding guide rod 4 and the outer sleeve 7 are coaxially fixed by screws, and there is an annular space for placing the linear bearing 6 between the moving sleeve 17 and the sliding guide rod 4, and the linear bearing 6 In the annular space; the spring 8 is fixed by the spring seat 9 in the inner hole of the outer sleeve 7, the retaining ring 5 is installed on the left end of the moving sleeve 17, the spring seat 9 is installed between the moving sleeve 17 and the outer sleeve 7, and the When the spring 8 is loaded into the moving sleeve 17...

Embodiment 2

[0024] Embodiment 2 is a schematic diagram of the installation structure of the SONY MD50 series magnetic ruler and magnetic head.

[0025] figure 2 As shown, the difference from Embodiment 1 is that the shapes of the inner hole of the sliding guide rod 4, the fixed gland 3 on the outlet side and the flange gland 10 are different, which is only due to the different shapes of the detection heads of the two types of sensors.

[0026] The principle of the present invention is: by fixing the measuring rod (magnetic head) of the displacement sensor in the sliding guide rod, and the iron core (magnetic ruler) of the displacement sensor is installed in the moving sleeve through the flange type fixing assembly, the sensor position detection process The middle moving sleeve and the sliding guide rod produce concentric relative sliding along the axis, and an air communication hole is set on each of the moving sleeve and the sliding guide rod to ensure that the main body will not crawl ...

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Abstract

The invention relates to an external displacement sensor. The external displacement sensor is characterized by comprising a linear bearing, an outer sleeve, springs, a sliding guide rod, a displacement sensor measuring rod and a movable sleeve, wherein the displacement sensor measuring rod is located in the sliding guide rod, the sliding guide rod is located in the outer sleeve, the sliding guide rod and the outer sleeve are coaxially fixed through screws, an annular space which is used for containing the linear bearing is formed between the movable sleeve and the sliding guide rod, and the linear bearing is located in the annular space; and the springs are fixed in an internal hole of the outer sleeve through spring seats, retaining rings are mounted at the left end of the movable sleeve, the spring seats are mounted between the movable sleeve and the outer sleeve, the movable sleeve is provided with a sealing cover at the end part of the outer sleeve, an O-shaped sealing ring is arranged between the sealing cover and the outer sleeve, and a dustproof ring and a combined seal are arranged between the sealing cover and the movable sleeve. The external displacement sensor has the advantages that the mounting and replacement are convenient, the sensing accuracy and operational reliability of the displacement sensor can be guaranteed, the contact wear to the sensor arising from uncoaxiality is avoided, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the field of metallurgical equipment, in particular to an external displacement sensor used in a hydraulic servo oil cylinder. Background technique [0002] In the field of metallurgical equipment, hydraulic servo cylinders are widely used. In order to achieve position control, each set of servo hydraulic cylinders is usually equipped with a displacement sensor for open-loop or closed-loop control of the position of the controlled equipment. LVDT type linear displacement sensor and SONY MD50 series magnetic head are two types of displacement sensors commonly used in hydraulic servo cylinders of metallurgical equipment. The following problems often occur in the installation of these two types of sensors: [0003] For displacement sensors of the built-in installation type. If the eccentric load of the oil cylinder causes the piston to tilt during the working process, the sensor core (magnetic scale) will be bent and deformed, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B15/28
Inventor 甄永富谢世明辛静泰
Owner CHINA NAT HEAVY MACHINERY RES INSTCO
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