JP2546780Y2 - Force reference machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a force reference device, and more particularly, to a force reference device used as a reference for power between nations or between countries, or for calibrating the force of a JIS force meter or an electric load cell.

[0002]

2. Description of the Related Art In a conventional force reference machine, a reference force having a first cylinder ram device comprising a cylinder and a first ram, and a weight suspended from the first ram to be lowered in the cylinder. It was not expected to replace the generator. The reference force generating unit has a function of changing the magnitude of the force transmitted to the force test main unit that detects expansion and contraction of the test body to which the force is applied.

On the other hand, the measurement accuracy required for a force reference machine is very high, and is usually required to be 1 / 100,000.

[0004]

[Problems to be solved by the present invention] However, in the conventional force reference machine, the reference force generating portion force could not be exchanged.
Since the ratio between the bottom area of the first ram of the first cylinder ram and the bottom area of the second ram of the second cylinder ram is constant, fine adjustment of the magnitude of the force transmitted to the apparatus force test main body is performed. Could not.

For this reason, there has been a problem that the measurement accuracy of the force reference machine is insufficient.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a force reference device having high measurement accuracy.

[0007]

In order to achieve the above object, the present invention provides a first cylinder ram device comprising a cylinder and a first ram, and a weight suspended from lowering the first ram. A second cylinder ram device including a reference force generation unit having a cylinder and a second ram, a head that moves up and down in accordance with the elevation of the second ram, and a test that holds a specimen between the head and the fixed unit. A force test body for detecting expansion and contraction of a test body to which a force is applied, a first space surrounded by a cylinder of the first cylinder ram and a first ram, and the second cylinder ram A hydraulic pressure generator for generating a pressure transmitted to the first ram and the second ram via a pipe communicating between the first cylinder and the second space surrounded by the second ram; To process the measured results of expansion and contraction A force reference apparatus comprising a processing unit,
The reference force generator has a plurality of first cylinder ram devices that are exchangeable, and the plurality of first cylinder ram devices have different bottom areas of the first ram.

[0008]

The reference force generator can replace a plurality of first cylinder ram devices. Since the bottom areas of the first rams of the plurality of first cylinder ram devices are different, the first cylinder ram device can be replaced. Thereby, the ratio between the bottom area of the first ram of the first cylinder ram and the bottom area of the second ram of the second cylinder ram can be changed. By changing the ratio between the bottom area of the first ram of the first cylinder ram and the bottom area of the second ram of the second cylinder ram, the pressure generated by the hydraulic pressure generation unit is equal to the pressure of the cylinder of the first cylinder ram. The first space surrounded by the ram, the cylinder of the second cylinder ram, and the second space surrounded by the second ram communicate with the first space via a pipe.
It is transmitted equally to the ram and the second ram. Since the force is given as the product of the pressure and the bottom area, by changing the ratio of the bottom area of the first ram of the first cylinder ram to the bottom area of the second ram of the second cylinder ram, the apparatus force test body section The magnitude of the force transmitted to the motor can be finely adjusted.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a force reference machine according to the present invention will be described below with reference to FIGS.

FIG. 3 shows the entire structure of the force reference machine. FIG.
In the above, the force reference machine includes a reference force generator 2 for adjusting a force to be applied to the test body 90, a force test main body 4 for applying a force to the test body 90 and detecting expansion and contraction of the test body 90 ,
The apparatus includes a hydraulic pressure generating section 6 for generating pressure and a data processing section 10 for processing a result of expansion and contraction of the test body 90 detected by the force test main body section 4.

The reference force generator 2 is provided with a first cylinder ram device 40 including a cylinder 42 and a first ram 41. A first space 47 surrounded by the cylinder 42 of the first cylinder ram 40 and the first ram 41 is formed.

The reference force generating section 2 is also provided with a fishing section 61 at the bottom 46 of the first cylinder ram device 40, and the fishing section 61 is detachably suspended with a weight 60 of various weights. The bottom 60 is fixed to the frame 43,
Is fixed to a saddle portion 44 at the top of the first cylinder ram device 40. A hemispherical pivot 45 is attached to the lower side of the saddle portion 44, whereby the first ram 4 is moved.
1 can be engaged with the saddle portion 44 in a comfortable posture.

The force test body 4 has a cylinder 82 and a second
A second cylinder ram device 80 comprising a ram 81;
A head 83 that moves up and down in response to the raising and lowering of the ram 81, and specimen holding sections 86 and 87 that hold a specimen 90 between the head 83 and the fixing sections 84 and 85 are provided. A saddle portion 91 is provided above the second cylinder ram device 80. A pivot 95 is attached to the lower side of the saddle portion 91 so that the pivot 95 can be engaged with the second ram 81 in a reasonable posture. A frame 9 extending downward at the lateral end of the saddle portion 91
2 is fixed, and the frame body 92 has a threaded portion 92a at the lower portion.
And penetrates the head 83. The head 83 is screwed with the threaded portion 92 a of the frame 92 so that the distance between the head 83 and the fixed portion 84 or the distance between the head 83 and the fixed portion 85 can be adjusted according to the length of the test body 90. After this adjustment, the test body 90 is locked to the threaded portion 92a. When measuring the tensile force of the specimen 90, the specimen 9
0 is set between the head 83 and the fixed portion 85, and is set between the head 83 and the fixed portion 85 when measuring the compression force.

The force test body 4 is provided with a displacement detector (not shown), and the change in the length of the test body 90 is measured by the displacement detector. The measurement result by the displacement detector is sent to the data processing unit 10.

Next, the general operation of the force reference machine shown in FIG. 3 will be described.

The magnitude of the pressure generated by the hydraulic pressure generator 6 is controlled and adjusted by a hydraulic controller 12. The pressure transmitted from the hydraulic control unit 12 is transmitted to the pipe 8. The pipe 8 is the first
First space 47 of cylinder ram 40 and second cylinder ram 8
0 and the second space 88. Therefore, the same pressure is transmitted to the first space 47 and the second space 88.

The first ram 41 is lifted by the pressure transmitted to the first space 47 by the pipe 8. Thereby, the first ram 41 rises so as to lift the saddle portion 44 upward. On the other hand, the frame 43 and the bottom 4
6, the weight of the weight 60 is loaded. Thereby, the first ram 41 moves in the descending direction. And
The first ram 41 stops at a position where the pressure transmitted by the pipe 8 and the weight of the weight 60 are balanced.

Further, the second ram 81 is lifted by the pressure transmitted to the second space 88. With the upward movement of the second ram 81, the head 83 rises integrally with the frame body 92. One of the test body holding portions 86 is fixed to the fixing portion 84 and the other is fixed to the head 83. Therefore, the test body 90 held by the test body holding portion 86 is raised by raising the head.
Is applied with a tensile force. Similarly, the specimen holding unit 87
Since one is fixed to the fixing portion 85 and the other is fixed to the head 83, a compressive force is applied to the test piece 90 held by the test piece holding section 87.

Next, a replaceable first cylinder ram device will be described with reference to FIGS. FIG. 1 is a front view showing a replaceable first cylinder ram device 40 and related devices. FIG. 2 is a plan view corresponding to FIG.

In FIG. 1, a first cylinder ram device 40
Are exchangeably mounted on the machine base 110. The positioning plate 100 is fixed on the machine base 110. The first cylinder ram device 40 is connected to the pipe 8 via the connection part 102. Further, it is connected to the speed reducer 104 via the connection part 104. The speed reducer 104 is connected to the drive motor 1
06 is reduced. Here, the drive motor 106
Is for rotating the first ram 41 of the first cylinder ram device 40. The first ram 41 moves up and down in the cylinder 42 while rotating, so that the frictional force is reduced and the first ram 41 can smoothly move up and down.

The first cylinder ram device 40 can be positioned by bringing the bottom side surface of the first cylinder ram device 40 into contact with the side surface of the positioning plate 100. After the first cylinder ram device 40 is positioned, the first cylinder ram device 40 is fixed on the machine base 110 by a suitable means.

A plurality of replaceable first cylinder ram devices 4
The bottom areas of the first ram first cylinder ram device 40 are different from each other.

Next, the operation of this embodiment will be described.

By setting the first cylinder rams 40 having different bottom areas of the first ram 41, the bottom areas of the first ram 41 of the first cylinder ram 40 and the second ram 81 of the second cylinder ram 80 are set. Can be changed. The pressure generated by the hydraulic pressure generating unit 6 is supplied to the first ram 41 via the pipe 8 communicating between the first space 47 and the second space 88.
And to the second ram 81 equally. Since the force is given as the product of the pressure and the bottom area, the first cylinder ram 4
By changing the ratio of the bottom area of the first ram 41 to the bottom area of the second ram 81 of the second cylinder ram 80, it is possible to finely adjust the magnitude of the force transmitted to the apparatus force test main body. it can.

According to this embodiment, a plurality of exchangeable first
Since the bottom areas of the first rams of the cylinder ram device 40 are different from each other, the magnitude of the force transmitted to the device force test main body can be finely adjusted.

Since the positioning plate 100 is provided, the plurality of first cylinder ram devices 40 can be connected to the connecting portions 102 and 104.
Position can be easily determined.

[0027]

[Effects of the Invention] As described above, according to the present invention,
Since the bottom areas of the first rams of the plurality of replaceable first cylinder ram devices are different from each other, the magnitude of the force transmitted to the device force test main body can be finely adjusted.

[Brief description of the drawings]

FIG. 1 shows a replaceable first power reference machine according to the present invention.
FIG. 2 is a front view of the cylinder ram device and related devices.

FIG. 2 is a plan view corresponding to FIG. 1;

FIG. 3 is an overall configuration diagram of an embodiment of the force reference device according to the present invention.

[Explanation of symbols]

 2 Reference force generation unit 4 Force test main unit 6 Hydraulic pressure generation unit 8 Piping 10 Data processing unit 40 First cylinder ram device 41 First ram 42 Cylinder 47 First space 60 Weight 80 Second cylinder ram 81 Second ram 82 cylinder 83 head 90 specimen 100 positioning plate

Claims (1)

(57) [Scope of request for utility model registration] 1. A reference force generator having a first cylinder ram device comprising a cylinder and a first ram, a weight suspended from the first ram, and a cylinder and a second ram. A second cylinder ram device, a head that moves up and down in accordance with the elevation of the second ram, and a specimen holding section that holds the specimen between the head and the fixed section; A force test main body for detecting expansion and contraction, a first space surrounded by the cylinder of the first cylinder ram and the first ram, and a second space surrounded by the cylinder of the second cylinder ram and the second ram; A hydraulic pressure generator for generating a pressure transmitted to the first ram and the second ram via a pipe communicating between the first and second rams, and a data processor for processing a measurement result of the expansion and contraction of the test body detected by the force test main body. A force reference machine, wherein the reference force generator is Having a first cylinder ram device having interchangeably, first of the plurality of first cylinder ram unit
Force reference machine characterized by different ram bottom areas.