JPH0422840A - Shear modulus measuring instrument - Google Patents

Abstract

PURPOSE:To improve measuring accuracy by reducing frictional resistance and to simplify the mounting work of a test piece by comprising a pivot rod of a convergent bar shape body, and comprising a pivot receiver of a miniature bearing. CONSTITUTION:A recessed part 30 is formed on a slide vertical wall 7, and the pivot receivers 31, 32 consisting of the miniature bearing the fitted in the recessed part 30. The convergent pivot rods 33, 34 tapered advancing the tip are inserted to the center holes of the pivot receivers 31, 32. In such a case, the pivot rods 33, 34 are comprised of hardened steel, and also, the pivot receivers 31, 32 are formed so as to sandwich a steel ball between an inner peripheral lace and an outer peripheral lace, and the steel ball and the laces are comprised of the hardened steel. By comprising a device in such a way, the measuring accuracy can be improved by lowering a friction coefficient, and also, to simplify the mounting work by eliminating the deviation of a fulcrum center due to the joining of the pivot rod with the pivot receiver.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to f&iWs for measuring the shear property coefficient of electrically insulating paper, functional paper, nonwoven fabric, film, etc. This invention relates to improvements in the pivot shaft portion of a measuring device.

(Prior Art) In electrical insulating paper used by being wrapped around electric wires, etc., the shear modulus of the paper is measured in advance in order to prevent breakage or breakage under various usage conditions.

Conventionally, as an apparatus for measuring the shear coefficient of physical properties of such industrial paper, apparatuses as shown in FIGS. 2 and 5 are known.

Referring to FIGS. 2 to 5, a cylindrical test piece 1 made of electrically insulating paper or the like has test piece fixing chucks 2.3 at both ends.
One test piece fixing chuck 2 is detachably connected to the frame 4. For installation, the frame 4 is erected on one horizontal stand 5, and two horizontal adjustment screws 6 are provided near both ends of the horizontal stand 5 to adjust the horizontal stand 5 to a horizontal state. The horizontal table 5 is adjusted to be in a horizontal state by winding the horizontal adjustment screw 6. The other specimen fixing chuck 3 has a pivot rotation #j
! It is removably connected to the structural part P. The pivot rotation mechanism section P is rotatably supported by the slide vertical wall 7 via a pivot rod, which will be described later. A movable table 8 is erected on the slide vertical wall 7, and the movable table 8 is slidably fitted to the slide bed 9, so that the movable table 8 can slide along the slide bed 9. In order to fix the movable base 8 at a predetermined position, the movable base 8 is provided with a through screw 10. By screwing the through screw 10 into the slide bed 9 side and abutting and fixing, the movable base 8 is fixed at a predetermined position. Fixed in position. The slide bed 9 is connected between the one horizontal table 5 and the other horizontal table 11, and is connected to the horizontal table 11.
Horizontal adjustment screws 12 near both ends of the horizontal table 11 are used to adjust the horizontal table 11 to be in a horizontal state. Further, a level 13 is installed on the horizontal table 11 so that it can be monitored whether the horizontal state is maintained.

Particularly with reference to FIGS. 4 and 5, the pivot rotation W1 structure WjP has pivot mountings at both ends at portions 14.15, and both pivot mountings are integrally or separately provided at the openings of portions 14.15. The connecting portion 16 and the pivot mounting portion 1
4.15 and pivot rod 17.18. One of the pivot rods 17 is fixed to the pivot attachment part 14, but the other pivot rod 18 is installed by screwing into the pivot attachment part 15, thereby fixing the pivot rod 18. It stands out and makes it immersive. The pivot rods 17, 18 are supported by projecting into pivot receivers 19, 20 provided on the side walls near the top of the sliding wall 7, thereby allowing the pivot rotation 8! The structural part P is rotatable.

A pointer port 21 and a weight hanging rod 22 are provided protruding from the connecting portion 16. As shown in FIG. 2, a pointer 23 is provided near the tip of the pointer port 21, and a weight 24 is suspended from a weight hanging rod 22.

In the shear modulus measuring device as described above, the shear modulus of the test piece 1 made of electrically insulating paper or the like is measured in the following manner.

The cylindrical test piece 1 is set in the open position of the test piece fixing chuck 2.3, and the weight 24 is suspended from the weight hanging rod 22. Then. The test piece 1 is twisted and the pointer rod 21
The position of the pointer 23 is displaced. As shown in FIG. 3, the displacement of the position of the pointer 23 is monitored with a microscope 25 and the amount of displacement is measured with a micrometer 26.

In the above measurement work, the rotation support between the pivot rod 17.18 of the pivot rotation mechanism part P and the pivot receiver 19.2o of the slide vertical wall 7 must be disengaged and fitted each time a test is performed.

This fitting and unfitting operation is carried out by sliding the sliding vertical wall 7 on the sliding bed 9 and winding one of the pivot rods 18 to retract or protrude.

In the conventional shear modulus measuring device as described above, the material of the pivot rods 17,]8 which have a structure for rotational support is glass, and the pivot receivers 19. The material of 20 was made of 7-fire, thereby reducing frictional resistance and making it possible to measure even minute torsional angles.

(Problem to be Solved by the Invention) However, in the above-mentioned known shear modulus measuring device, since the pivot rod 17.18 and the pivot receiver 19.20 are supported in contact with each other during each test, the pivot This will cause damage to the rods 17 and 18 and the support 19 and 20.

If such damage occurs, there is a risk that the fulcrum center will be displaced and the measurement accuracy will be reduced.

Also, in order to prevent such damage to the pivot rod 17.18 and the pivot receiver 19.20, the pivot rod 1
It is better to loosen the tightening of 8, but if it is tightened so loosely, it will not be possible to obtain a stable support and center as described above, and the accuracy of the measurement will decrease.

Such deficiencies naturally occur due to the nature of glass and 7-layer materials, and cannot be avoided.

Therefore, the purpose of the present invention is to improve the above-mentioned defects and flies, to make the mounting of the test piece simple and easy, to have a high upper-side constant accuracy y, e, and to have a pivot mechanism with improved durability. To provide measuring equipment.

(Means for Solving the Problems) The present invention is characterized in that the pivot rod is constituted by a tapered rod-like body tapered toward the tip, and the pivot receiver is formed by a mini-chain 7 made of a race and a ball. It consists of bearings.

(Example) Hereinafter, one embodiment of the present invention will be explained with reference to the drawings.

Since the main part of the present invention lies in the structure of the pivot rod and pivot receiver, in the following explanation, only the pivot rod and pivot receiver according to the present invention will be explained. Since it is the same as a conventionally known measuring device, it will be explained.

Referring to FIG. 1, a recess 30 is formed in the wall 7 of the slide 1, into which a pivot receiver 31, 32 consisting of a miniature bearing is fitted. A pivot rod 33.34 with a tapered tip is inserted into the center hole of the pivot receiver 31.32, which is a miniature bearing.

In this embodiment of the invention, the pivot rods 33,34 are constructed of hardened steel. Further, the pivot receivers 31 and 32 are made by sandwiching a steel ball between an inner race and an outer race, similar to a normal bearing, and in this embodiment of the present invention, the steel balls and the race are Both are made of hardened steel.

The vivo rod 33 of the present invention configured as described above
．． According to the mechanisms of 34 and pivot receivers 31 and 32, the rolling friction coefficient is 1.002 to 1.002, depending on the size.
0.0007'l (-Yes.

On the other hand, in the conventional structure made of glass and sapphire, the coefficient of sliding friction is around 0.4. Therefore, what is the advantage of the mechanism according to the present invention? The friction coefficient is approximately 200 times higher, and the measurement accuracy is improved accordingly.

Also, a pivot receiver 31 consisting of a miniature bearing.
32 has a hole in the center and a pivot rod 33.3
4 is tapered toward the tip, so the pivot rod 33.34 and the pivot receiver 31.3
There is no shift of the support or center due to joining with 2, and the installation work is easy.

The above is one embodiment of the present invention, and the present invention is not limited to the above-mentioned shear modulus measuring device, but measures the shear modulus by using a pivot 8!1 structure made of glass and 7 wires. It is also applicable to other shear modulus measuring devices.

Further, the material of the pivot rod and the miniature bearing is not limited to the above-mentioned hardened steel, but other metals, alloys, ceramics, hard plastics, etc. may be used. In this way, even if the materials of the pivot rod and the miniature bearing are changed, the coefficient of friction caused by floating will be smaller than the coefficient of sliding friction between the pivot holder and the vivo trosod made of glass and sapphire.

(Effects of the Invention) Since the present invention is formed in M4 as described above, the following effects are achieved.

According to the present invention, measurement accuracy is improved because frictional resistance is reduced.

The combination of a pivot receiver made of a miniature bearing and a tapered bibo/trod with a tapered tip toward the tip makes it possible to obtain the fulcrum center reliably and easily, improving measurement accuracy in this area. At the same time, work efficiency is improved.

Since the friction contact is not caused by abutment as in the past, there is no damage to the pivot rod or pivot receiver, and durability is improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a pivot rod and a pivot receiver showing one embodiment of the present invention, FIG. 2 is a perspective view of a conventionally known shear modulus measuring device to which the present invention is applied, and FIG. 2 is a schematic perspective view showing the measurement work performed by the measuring device shown in FIG. 2, FIG. 4 is an enlarged perspective view showing the pivot rotation mechanism part shown in FIG. 2, and FIG. 5 is an enlarged sectional view showing the pivot rod and pivot receiver shown in FIG. 4. It is. 1: Test piece 2.3: Test piece fixing chuck 4: Mounting frame 5: Horizontal table 6: Horizontal adjustment screw P: Pivot rotation mechanism 7: Slide vertical wall 8: Moving table 9 Ni Slide bed 10: Penetrating screw 11: Horizontal stand 12: Horizontal adjustment screw 13: Level 14.15: Pivot mounting part 1 33.34: Pivot rod 35.36: Pivot receiver 6: Connection part

Claims (1)

[Scope of Claims] Both ends of a cylindrical test piece are fixed to a pivot rotation mechanism part in which a test piece fixing chuck has a pivot rod, and at the same time one of the pivot rods is installed so that it can protrude and retract. In a shear elastic modulus measuring device that is supported in contact with a pivot receiver provided on a movably mounted sliding wall, and in which the pivot rotation mechanism section is provided with a pointer rod and a weight hanging rod, the pivot rod is A shear modulus measuring device comprising a rod-shaped body tapered toward the tip, and the pivot receiver comprising a mini chair bearing consisting of a race and a ball.