JPS59120802A - Apparatus for detecting displacement - Google Patents

Abstract

PURPOSE:To reduce the cost of the titled apparatus and to miniaturize the same, by detecting the changes of magnetic resistances in the magnetically deteriorated part and non-deterorated part provided to a generally used rod shaped body by a magnetic detector. CONSTITUTION:The molten metal 3 injected in the inner bore of the sleeve 2 attached to a die plate 1 is introduced into the space 9 constituted between molds 8a, 8b under pressure by the leftward movement of a plunger 7 connected to the rod 5 being a rod shaped body in a support 1a and a pressure injection cylinder 4 by a coupling 6 and cooled to be formed into a product having a predetermined shape. A magnetic detecting apparatus 10 consisting of a main body 11 provided in close vicinity to the rod 5 and the permanent magnet 12, a magnetic path 13, a magnetic resistance element 14 and a magnetic pole piece 15 which are provided in the main body 11 generates line 17 of magnetic force so as to allow the same to also pass the magnetically deteriorated part of the rod 5 and the permanent magnet 12, the magnetic path 13 and the magnetic pole piece 15 are fixed in the main body 11 by a plastic filler 21.

Description

[Detailed Description of the Invention] The cylindrical part is installed in the rTjl I ball / cylinder, nitrogen H- / linter, etc. / The displacement of the parts of the whole 4''-r is 2) Change 1) Regarding the γ detection device.

- In general, rod-shaped parts that are inserted into hydraulic, 7' cylinder, pneumatic/cylinder, etc. are slightly smaller in diameter than the same parts, and have a magnetic part on the surface of the part body. An outer layer with physical properties? 1 (J materials are fixed (7) The above parts are constructed (7 things are /). This part is machined, plating, thermal spraying, etc. - "Because of this, the manufacturing cost is high, and there is a dispute that it is limited to 1-length use.It has the disadvantage of being limited to 1-length use (, 2). 61. Changes in the appearance of mechanical equipment'
Each case is considered a small crime, and mechanical device 6 is changed to small 7, self-UU+, high 1 (I, conversion ε''Lc is Removal 1 - The purpose of the removal is 11. It is for the purpose of removing a generally used iron-based alloy ridge-shaped part. By removing the excess outer layer, the cost can be reduced by removing the excess outer layer, and the cost can be reduced by peeling off the surface, abrasion, and demolition (- also by detecting the displacement of a cylinder with rod-shaped parts. The equipment is fully maintained.

Hereinafter, one embodiment of the present invention will be described with reference to FIG. In diagram i1, gui plate 1
The molten metal 3 injected into the inner hole of the sleeve 2 installed in The space 9 formed between the molds 8a and 8F]
The product is press-fitted into a container and cooled to form a product with a predetermined shape. Since the quality of this product has a large influence on the state of change in speed when the plunger 7 moves leftward, it is necessary to constantly monitor and adjust the leftward speed of the plunger 7.

Next, the displacement detection device 10, which is a main part of Mokukomei, will be explained with reference to FIGS. 2 and 3. The rod-shaped rod 5 is made of an iron-based alloy, and the frontage 5 can be heated and cooled for a short time using a laser beam with very high density energy, other hot rays, or an electron beam. The magnetically altered part 5 has a hardened state and has different magnetic properties, especially magnetic permeability.
A: They can be easily provided on the circumferential surface of the rod 5 at predetermined intervals in the axial direction. i! The magnetically altered portion 5A can also be provided in a spiral shape, a ring shape, or a diagonal shape by appropriately performing the above-mentioned hardening method. A magnetically altered part 5A with a width of about 0.5 mm and a depth of about 0.5 mm provided on the outer peripheral surface of the rod 5 is a laser beam having an output of about 1 kW at a speed of L'5'/'min. It is well coated and the rate of change in magnetic permeability shows a value of 400 to 800%.

a main body 11 provided close to the rod 5;
Permanent magnet 12, magnetic path 13, and magnetic resistance element 14 provided inside
, a magnetic detection device 10 consisting of magnetic pole pieces 15 has a magnetic field line 17
occurs, and it also passes through 58 magnetically altered parts of low y M5.

The permanent magnet 12, the magnetic path 13, and the magnetic pole piece 5 are fixed in the body 11 with a plastic filler 2.

When the rod 5 moves in the direction of the arrow 18σ shown in FIG.
2. The magnetic field lines 17 that pass through the area composed of the magnetic path 13, the magnetic pole piece 15, and the rod 5 increase or decrease the magnetic resistance as they pass, so the strength of the lines of force that they pass through changes. Therefore, between the magnetic paths 13 The electrical resistance of the magnetoresistive element (14σ) inserted into the
It can be sent as an electric signal to the outside of the magnetic detector 0 via the display section 22 of 9. Therefore, by observing the electrical signals in correspondence with time, it is possible to quantitatively know the moving speed of the rod 5, the acceleration JW1, and also the amount of movement of the lot 5 based on the number of times the rod 5 is moved (No. 1 (1)).

In this embodiment, the magnetic pole piece 15 is made thin, and a large number of lines of magnetic force 17 are made to pass completely through the inside of the magnetically altered portion 5A in the longitudinal direction (2).
Therefore, the change in the strength of the magnetic lines of force 17 corresponding to the change in magnetic permeability of the magnetic percent altered portion 5A is large, and the electric signal becomes larger than that of the magnetoresistive element 14.

This embodiment is very advantageous even when the width to the magnetically altered portion 5 is small and the distance between the magnetic I section 5A in the direction of the rod 5 is small. II. In the embodiment described above, a single magnetic pole piece 15 is provided;
By providing it in the axial direction of the magnetoresistive element J4, it is possible to detect the moving direction of the rod 5 and to obtain and output a larger electrical signal.
The force inserted into the path of the magnetoresistive element 14 or the differential magnetoresistive force is fully utilized, and the characteristics of the magnetoresistive element 14 change depending on the temperature. 1., so as to erase it.

In addition, in the embodiment described above, the permanent magnet 12, the magnetic path ]3,
Magnetic detection device 1 consisting of a magnetoresistive element 14 and a magnetic pole piece 15
The permanent magnet 12 and the magnetoresistive element 14 are completely removed, and the detection coil k (I), which has a coil wound on a magnetically permeable material instead of the permanent magnet 12 (I), is shown above. A similar magnetic detector system can be used.

As described above, according to the present invention, a commonly used rod-shaped body is used, and a magnetic detector detects changes in magnetic resistance in the magnetically altered and unaltered areas provided on the rod-shaped body. [Yori, the floor of the 伜shaped body 1g-5+1
8 degrees, positioning/accurate E monitoring, or: 1ill f wholesale/
) Since this can be ensured, this device fY: IU e/co machine (self-width power 1 and miniaturization ke = t A + 2, and 1 - product quality & U vs. 1 This has the effect of lowering the W and changing 1.

[Brief explanation of the drawing]

Figure 1 shows an outline of the main body 1 of 11 shown in Figure 1. Figure 2 shows A of 1;
A few glands shown, i i Jf view, Figure 3 kl:
aL Figure 2 (/J B -HMJ 'Cross-sectional view -
VAZ) (,1, Rin-55-1 all, 1 down,
5) ＼-Change the seven eclipses, 50.
j part, 7- gra/ja, 1.0- (English it + table [6
, 11・Honko, ■2 Mizuku Sosen, 1;-I Magnetic path, 1.
1 Antigen to magnetic 'sil - 1, 15, magnetic fragment, 17 Lines of magnetic force, 22 - Display part t) J,:. Applicant: Toshiba Corporation suspended

Claims (1)

[Claims] ryuj] 2 7/ Linda, ni! /l three /
There are 4 in Linda and others! 11'' The magnetic alteration part is placed at an interval of shearing force l in the axis 75 direction of the front mJ part,
A rod-shaped body made of an iron-based alloy with a non-altered part provided with a flame, and a permanent magnet, a magnetic path, a magnetoresistive cord,
There are magnetic fragments, and the magnetic force generated from these, the rice is 1ffj
+ Due to the movement of the recording body, the magnetically modified part n and the non-transformed part are completely missing &-
3) By detecting the sound of change in magnetoresistance generated in the lines of magnetic force by using a V-shaped magnetic force generator and a magnetic force generator installed in the same 11H' air force generator, the displacement state of the plate-like body was detected in 111. (A displacement detection device consisting of a display section and a display section.