JPH0328357Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention can be used in high-temperature sealed corrosion test chambers, etc.
This invention relates to a displacement measuring device used for measuring the displacement of a test piece inside a tank and taking it out of the tank.

(Prior art and its problems) In material testing using a high-temperature sealed corrosion test tank, environmental conditions such as high temperatures, (high pressure, corrosive gas, corrosive liquid), the displacement of the specimen must be taken out of the tank by some method and measured.

The conventional method used in such cases is
This method uses a differential transformer as a transducer to detect the amount of displacement, and the coil is installed outside the tank (in the atmosphere) and the core is placed inside the tank. There are limits to its uses due to exposure to the environment. Furthermore, since the tank wall is interposed between the core and the coil, there is a problem in that the output (sensitivity) is reduced. Furthermore, in the conventional method described above, the transducer had to be installed parallel to the central axis of the test piece, which requires space, which increases the size of the container, and also allows the transducer to be installed parallel to the center axis of the test piece. There was a problem that displacement in the direction perpendicular to the axis of action of the load could not be detected.

(Purpose of the invention) This invention improves the problems of the conventional device described above.The transducer is placed outside the tank, completely preventing leakage of the atmosphere inside the tank, and making it possible to measure displacement with high precision. The object of the present invention is to provide a displacement measurement device that can perform the following measurements.

(Summary of the invention) The displacement measurement device according to the invention has two arms provided in the test chamber at right angles to the displacement direction, and an engagement means at the tip of the arm that engages with the gauge point of the test piece. At the same time, a fulcrum is provided in the middle of the arm, and the weight of the arm is supported by this fulcrum.
A hollow connecting rod is provided at the rear end of the first arm of the two arms in a right angle direction, and a connecting rod passing through the inside of the hollow connecting rod is installed at the rear end of the second arm. At the positions where these two connecting rods are provided, four stages of bellows are installed in series along the axial direction of the connecting rods to airtightly partition the inside and outside of the test chamber. 1st located inside
The inner end of the bellows is fixed to a fixed flange fixed to the test chamber, and a first intermediate flange movable back and forth is provided at the boundary between the first bellows and the second bellows adjacent thereto. The ends of the first bellows and the second bellows are fixed to this from both sides,
A second fixing flange is provided at the boundary between the second bellows and the third bellows adjacent thereto, and the ends of the second bellows and the third bellows are fixed to this from both sides. and the fourth adjacent
A movable intermediate flange similar to the first intermediate flange is provided at the boundary of the third bellows.
The ends of the bellows and the fourth bellows are fixed from both sides, the outer end of the fourth bellows is fixed to a fixed flange that does not move due to contraction of the bellows, and the insides of these bellows communicate with the inside of the test chamber. let me,
The hollow connecting rod of the first arm passes through the inside of the first bellows and is fixed to the first intermediate flange, and the connecting rod of the second arm connects the hollow connecting rod and the insides of the second and third bellows. The bellows is fixed to the second intermediate flange through the bellows, and a take-out rod provided on the outside of the bellows is connected to the first intermediate flange and the second intermediate flange, respectively. The present invention is characterized by being provided with a flange movement detection device that detects relative movement of both intermediate flanges.

(Example) Below, an example shown in the drawings will be described. This displacement detection device 1 is attached to a test tank (container) 2 in which a test environment is maintained, and is installed outside the test tank. A heating furnace 4 equipped with a heater 3 is provided. The test piece 5 is held in the tank 2,
A load P is applied via chucks 6, 6 of a loading device (not shown).

The tank 2 is integrally provided with a cylindrical portion 7 that projects outward, and two upper and lower arms 10 and 11 are housed inside the cylindrical portion 7. arm 10,
11 is provided almost at right angles to the axial direction of the test piece, and the tip of the upper first arm 10 is connected to the test piece 5.
The tip of the second arm 11 on the lower side is locked on the gage B on the lower side.
The gauge points A and B are formed in the shape of a protrusion, and the arm 1
The tips of Nos. 0 and 11 engage with this to prevent it from slipping. Additionally, this part allows the arm and specimen to rotate slightly. The tip of the arm is attached to the reference point by pressing it with a spring or by lightly locking it.
A fulcrum 13 is provided between the arms 10 and 11, and the fulcrum 13 is suspended by a spring 15 for supporting the weight of the arms.

A cylindrical bellows chamber 20 is integrally provided at the outer end of the cylindrical portion 7 and projects at right angles to the cylindrical portion 7.
Inside this, there are four bellows 21, 22, 2, upper and lower.
3 and 24 are provided in series. The innermost (lower) end of the first bellows 21 located at the innermost (lowermost stage) is fixed to a partition wall 26 between the cylindrical portion 7 and the fixed flange. first bellows 21
and the second bellows 22 adjacent thereto,
First intermediate flange 2 having a through hole 27a in the core
7 is provided, the upper end of the first bellows is fixed to the lower surface side, and the second bellows 2 is fixed to the upper surface side.
The lower end of 2 is fixed. Second bellows 2
The bellows chamber 2 is located between the second and third bellows 23.
Partition wall-like fixed flange 2 integrally provided with 0
9 is provided. The upper end portion of the second bellows 22 is fixed to the lower surface side of this fixed flange 29, and the lower end portion of the third bellows 23 is fixed to the upper surface side. A through hole 29a is bored in the core of the fixed flange 29. A second intermediate flange 30 is provided between the third bellows 23 and the fourth bellows 24, and the upper end of the third bellows 23 and the lower end of the fourth bellows 24 are fixed to both upper and lower surfaces of the second intermediate flange 30, respectively. ing. Second intermediate flange 30
A through hole 30a is bored in the hole 30a. The upper end of the fourth bellows 24 is connected to the upper end outer wall 31 of the bellows chamber.
is fixed on the inner surface of. Note that the first bellows 21 and the second bellows 22 are formed to have the same size, and the third bellows 23 and the fourth bellows 24 are formed to have the same size.
are also formed to have the same size.

The first intermediate flange 27 and the second intermediate flange 30 are provided vertically movably,
Take-out rod 3 connected on the outside of the bellows
2 and 33, the movement is taken out to the outside of the bellows chamber 20.

A hollow pipe-shaped connecting rod 35 is attached to the rear end of the first arm 10 in a direction perpendicular to the arm. The upper part of this hollow connecting rod 35 is
It is inserted into the bellows chamber 20 through the communication hole 36 connecting the cylindrical portion 7 and the bellows chamber 20, penetrates the inside of the first bellows 21, and is fixed to the first intermediate flange 27. Further, a connecting rod 37 is provided at the rear end of the second arm 11 in a direction perpendicular to the arm, and this connecting rod 37 connects to the hollow connecting rod 35.
and the second intermediate flange 30 through the inside of the second bellows 22 and the third bellows 23.
Fixed. The inside of the cylindrical portion 7 communicates with the inside of the tank 2, and the inside of the four stages of bellows is connected to the communication hole 36, the through holes 27a and 30a of the intermediate flanges 27 and 30, and the through hole 2 of the fixed flange 29.
It communicates with the inside of the cylindrical portion 7 through 9a. However, other parts of the bellows chamber 20 are completely isolated from the tank atmosphere by the bellows 21, 22, 23, and 24. Therefore, the extraction rod 3
2 and 33 are projecting holes 20 that project from the bellows chamber.
Even if special gaskets are not provided for a, 20b, etc., the atmosphere inside the tank will not leak. In addition,
A cooling water jacket 40 is wound around the outer periphery of the cylindrical portion 7.

A base 41 is provided at the upper end of the take-out rod 32 attached to the first intermediate flange 27 that projects outside the bellows chamber 20, and a coil 44 of a differential transformer 43, which is a transducer, is fixed to this. ing. Further, a core 45 is fixed to the upper end of the second intermediate flange 30 that projects outside the bellows chamber 20. The output signal of the differential transformer 43 is converted into a signal representing the amount of displacement by the arithmetic unit 47, and is taken out to the outside.

When this displacement measuring device 1 is used, when a load P is applied to the test piece 5, the distance between the gauge points A and B changes and the arms 10 and 11 move up and down. This movement is transmitted to the intermediate flanges 27, 30 by the connecting rods 35, 37, and is further transmitted to the intermediate flanges 27, 30 by the connecting rods 35, 37.
2 and 33, and is transmitted to a flange movement detection device, ie, a differential transformer 43, installed in the atmosphere. The displacement of the upper gauge point A is determined by the first arm 10, the hollow connecting rod 35, the first
It is transmitted to the coil 44 via the intermediate flange 27 and the take-out rod 32 to displace the coil. The displacement of the lower gauge point B is determined by the displacement of the second arm 11 and the connecting rod 3.
7. It is transmitted to the core 45 via the second intermediate flange 30 and the take-out rod 33 and displaces the core. A signal representing the amount of relative displacement between the coil 44 and the core 45 is extracted, and based on this signal, the amount of displacement of the test piece is measured.

This displacement measurement device 1 can detect not only the displacement of the test piece in the axial direction but also the displacement in the diameter direction and width direction. Only one transducer is required for measurement. Since there is no need to arrange a take-out rod inside the tank for taking out the displacement amount to the outside, the test tank 2 can be downsized. Further, no special packing or the like is required for the protruding portion of the extraction rod. Depending on the position of the fulcrum, the lever ratio of the arm can be freely set. Since the interiors of the four bellows communicate with each other, they have a pressure balancing function and no errors occur due to pressure differences. As the test environment inside the tank, various conditions can be adopted from high temperature to low temperature and from high pressure to vacuum. Note that since the transducer can be set in the atmosphere, it is not limited to the differential transformer shown in the illustration, but various types such as an overcurrent type, a capacitive type, an optical type, and a strain gauge type can be used.

(Effect of the invention) As is clear from the above explanation, the displacement measuring device according to the invention can accurately measure the displacement of the test piece inside the tank to the outside without leaking the inside environment of the tank to the outside. As a result, it has become an excellent product that allows highly accurate displacement measurement with a single transducer.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention;
FIG. 2 is an enlarged view of the main part. 1... Displacement measuring device, 2... Test tank, 5...
Test piece, 7... Cylinder part, 10, 11... Arm, 1
3... Fulcrum, 20... Bellows chamber, 21, 22,
23, 24... Bellows, 27, 30... Intermediate flange, 29... Fixed flange, 32, 33...
Take-out rod, 35, 37...Connection rod, 43...Differential transformer.

Claims (1)

[Scope of utility model registration request] Two arms are provided in the test chamber at right angles to the displacement direction, and each arm is provided with an engagement means for engaging with a reference point of the test piece at the tip thereof, and a fulcrum is provided in the middle of the arm. , the weight of the arm is supported at this fulcrum, and the rear end of the first arm of the two arms is provided with a hollow connecting rod in a right angle direction, and the rear end of the second arm is provided with the A connecting rod penetrating the inside of the hollow connecting rod is provided, and these two
At the position where the connecting rod is provided, four stages of bellows are installed in series along the axial direction of the connecting rod to airtightly partition the inside and outside of the test chamber. The inner end of the bellows is fixed to a fixed flange fixed to the test chamber, and a first intermediate flange movable back and forth is provided at the boundary between the first bellows and the second bellows adjacent thereto. The ends of the first bellows and the second bellows are fixed from both sides, and a second fixing flange is provided at the boundary between the second bellows and the third bellows adjacent thereto. The ends of the bellows and the third bellows are fixed from both sides, and the boundary between the third bellows and the fourth bellows adjacent thereto is provided with the first bellows.
A movable intermediate flange similar to the intermediate flange of is provided to fix the ends of the third bellows and the fourth bellows from both sides, and the outer end of the fourth bellows is fixed so that it does not move due to contraction of the bellows. the hollow connecting rod of the first arm passes through the interior of the first bellows and is fixed to the first intermediate flange, and the interior of the bellows communicates with the interior of the test chamber; The connecting rod passes through the hollow connecting rod and the insides of the second and third bellows and is fixed to the second intermediate flange. What is claimed is: 1. A displacement measuring device comprising a flange movement detecting device connected to respective take-out rods provided in the flange and detecting relative movement of both intermediate flanges transmitted by these take-out rods.