JPH1172303A - Displacement measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a displacement measuring apparatus in which a contact as a measuring member can be attached or removed by a simple operation with reference to a test piece, in which the distance between the test piece and the measuring member can be changed without moving an apparatus body and in which the measuring member can be constituted of only a lever. SOLUTION: Contacts 27, 28 are installed at tip parts of levers 17, 18 which are supported by shafts 10, 20 in two points in separated positions on a base plate 14. A test piece 40 is gripped by the contacts 27, 28 by using the force of a spring 21. Then, the lever 17 on the other side is extended by the action of a pin 24 at a lever opening and shutting rod 23 which is held so as to be turned freely by a shaft 22 which is installed in the intermediate part of the lever 18 on one side, and the contacts 27, 28 can be released from the test piece 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the measurement of the amount of deformation occurring in response to a load in a material test performed as part of quality evaluation of processed materials and products such as rubber, plastics, fibers and metals. The present invention relates to a displacement measuring device to be used.

[0002]

2. Description of the Related Art In many industrial products, a strength test is performed as part of quality evaluation, and the amount of deformation of a test piece with respect to a load is measured. Is expensive, and the method of contacting the measuring member between the reference points of the test piece is generally widely used, and the method of contacting the measuring member with the test piece is not limited to the method using air pressure or electromagnetic force. Many manual methods are provided, and among them, those suitable for the purpose of use are selected and used.

[0003]

However, those using pneumatic or electromagnetic force for contacting the test piece with the measuring member have a drawback that the switch operation is required, so that there is little labor saving effect and there is little place to be obtained for high cost. In addition, there is a problem in that a fine adjustment of the distance between the measuring member and the test piece requires a position adjusting mechanism.

An object of the present invention is to provide a displacement measuring apparatus which is inexpensive, has excellent operability, and has a function capable of coping with a delicate distance adjustment between a measuring member and a test piece with a simple configuration.

[0005]

In order to achieve the above object, in a displacement measuring apparatus according to the present invention, a pair of measuring members contacting between reference points of a test piece are provided with a base which can be freely raised and lowered by a balance weight. A lever supported by two rotating shafts at separate positions on a plate, a contact provided at the tip of the lever to grip a test piece by using a spring force, and a lever at an intermediate portion of one lever. It consists of a lever open / close rod that is provided so as to be freely rotatable, and pushes and spreads the other lever by the action of a pin provided on the lever open / close rod, enabling the lever to be released from the test piece by a simple operation. The operability and functionality are improved by adding a function of compensating for a delicate distance difference between the measuring device and the test piece by utilizing the degree of freedom of the lever supported by the rotating shafts at two different positions, and the simplicity is further improved. Inexpensive device with configuration That.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the displacement measuring device according to the present invention will be described with reference to FIGS.

FIG. 1 shows the structure of an apparatus according to an embodiment of the present invention.
A spring 21 is bridged between levers 17 and 18 supported by rotating shafts 19 and 20 disposed at two spaced positions on the base plate 14, and levers 17 attracted to each other by the action of the spring 21. , 18 are provided with contacts 27, 28 supported by the rotating shafts 25, 26 and capable of swinging in the horizontal direction.

A lever opening / closing rod 23 is provided at an intermediate portion of the lever 18 so as to be freely rotatable with respect to a horizontal direction by a rotating shaft 22.
As shown in FIG. 1, when the levers 17 and 18 are opened so that they are substantially parallel to each other, the pin 24 of the lever opening / closing rod 23 projects to a position where the pin 24 contacts the inside of the lever 17 as shown in FIG. Has been established.

Opening and closing of the contacts 27 and 28 provided at the distal ends of the levers 17 and 18 can be performed by a simple method by operating a finger in the rotating direction of the lever opening and closing bar 23. In the material test, the components shown in FIG. 1 are arranged as measuring members 12 and 13 of the displacement measuring device 1 in two sets of upper and lower as shown in FIG. 2, and as shown in FIG. 4
0 is located at the center.

FIG. 4 shows a state in which the contacts 27 and 28 are arranged at the center of the test piece 40, the levers 17 and 18 are closed by operating the lever opening / closing rod 23, and the contacts 27 and 28 are attached to the test piece 40. This shows a state of being pinched. Therefore, FIG.
Of the measuring members 12, 13 to the test piece 40 by the simple operation of the lever opening / closing rod 23 on each of the measuring members 12, 13 as shown in FIGS. Can be.

Here, the relationship between the apparatus according to the embodiment of the present invention and the material testing machine will be described with reference to FIG. The load of the test piece 40 in which the contacts 27 and 28 of the measuring members 12 and 13 of the apparatus according to the embodiment of the present invention shown in FIG. 1 are gripped between the upper and lower grips 36 and 37 of the material testing machine 30. It is arranged along the central axis.

An upper grip 36 connected to the upper machine frame 31 of the material testing machine 30 and a cross head 35 which is moved up and down by the rotational driving of the screws 33 and 34 erected between the upper machine frame 31 and the lower machine frame 32. The test piece 40 gripped between the lower tool 37 disposed is loaded by the movement of the crosshead 35, and the test piece 40 is deformed according to the applied load.

A displacement measuring device 1 is provided between the reference points of the test piece 40.
Of the measuring members 12 and 13 are clamped. The measuring members 12 and 13 are the substrate 3 fixed to the machine pillar 4.
The weights are balanced by the balance weights 8, 9 suspended by the wires 6, 7 via the pulley 10 disposed above, and the measuring members 12, 13 can freely move up and down even with a small external force.

The contact 2 sandwiched between the reference points of the test piece 40
The measuring members 12 and 13 having the members 7 and 28 follow the contacts 27 and 28 that follow the deformation of the loaded test piece 40.
Move according to. The measuring members 12 and 13 are guided and moved by the linear shaft 5 on which the linear bearings 16 arranged on the respective base plates 14 slide. Measuring members 12, 13
The displacement of the displacement detector 1 connected to the rotation axis of the pulley 10 is controlled by rotating the pulley 10 via the wires 6 and 7.
1 is detected as the amount of deformation between the reference points of the test piece 40.

In the relationship between the material testing machine 30 and the displacement measuring device 1, as shown in FIG.
The base 2 of the displacement measuring device 1 is fixed to the tip of measuring members 12 and 13 of the displacement measuring device 1 sandwiched between the position where the device is fixed and the reference point of the test piece 40. There is a situation in which the positions of the contacts 27 and 28 to be provided are far apart, and a lot of labor and an excessively large position adjusting device must be added to the work of adjusting the positions.

According to the measuring members 12 and 13 of the displacement measuring device 1 according to the present invention, as shown in FIG.
Regardless of the linear shaft 5 that restrains the positions of the linear shafts 2 and 13, the contacts 27 and 28 for holding the test piece 40 and the levers 17 and 18 for holding the test pieces 40 have the degrees of freedom of the respective rotating shafts 19, 20, 25 and 26. The test piece 40 can be clamped between the contacts 27 and 28 regardless of whether the center of the displacement measuring device 1 and the central axis of the load of the material testing machine 30 are shifted by X minutes. In addition, since the degree of freedom in the left-right direction resulting from the allowable rotation angles of the levers 17 and 18 is added, the displacement measuring device 1 is connected
Since no extreme precision is required to set the value to 0, effects such as elimination of excessive labor and an excessive position adjustment mechanism are produced.

The measuring members 12, 1 of the displacement measuring device 1
In some cases, expensive means using a pressurized fluid or an electromagnetic force is used to clamp the contacts 27 and 28 of the test piece 40 to the test piece 40. However, according to the present invention, a simple configuration and It is possible to provide a displacement measuring device that is easy to operate.

[0018]

The present invention has the following effects because it has the structure described above.

The contact operation of the measuring member with the test piece can be performed by an extremely simple operation by moving the fingertip back and forth. In addition, a separate position adjusting mechanism is provided for finely adjusting the distance between the test piece and the contact member of the measuring member. The measurement can be performed within the range of the lever configuration of the measuring member according to the present invention.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a measuring member of an apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between an apparatus according to an embodiment of the present invention and a material testing machine.

FIG. 3 is a diagram showing a measuring member of the apparatus according to an embodiment of the present invention when the lever is opened.

FIG. 4 is a diagram illustrating a state of the measuring member of the apparatus according to the embodiment of the present invention when the lever is closed.

FIG. 5 is a diagram showing a relationship between a test piece and a contact when the lever of the measuring member of the apparatus according to the embodiment of the present invention is closed.

[Explanation of symbols]

 1 ··· Displacement measuring device 12, 13 · Measuring member 14 ··· Base plate 17, 18 · Lever 19, 20 · Rotating shaft 21 ··· Spring 22 ··· Rotating shaft 23 ··· Lever opening / closing rod 24 ... Pin 25, 26 Rotary shaft 27, 28 Contact 40 ... Test piece

Claims (1)

[Claims] 1. A test in which a contact is provided at the tip of a lever which is supported by two rotation shafts at distant positions on a base plate, and the contact is closed by the action of a spring provided between the levers. A pair of measuring members for gripping the piece and opening and closing the contact by pushing and spreading the other lever with a pin of a lever opening / closing rod rotatably held by a rotating shaft provided at an intermediate portion of one lever. A displacement measuring device characterized by the above-mentioned.