JPS62254035A - Material testing apparatus - Google Patents

Abstract

PURPOSE:To simplify a drive mechanism and to prevent the generation of backlash, by constituting the titled apparatus so that a crosshead is driven by utilizing a direct drive motor and a ball screw. CONSTITUTION:A material testing apparatus is constituted so that the drive mechanism of a crosshead 7 is constituted of a direct drive motor 10 and screw levers 3, 4 each having a ball screw carved therein and test load is applied to the test piece 15 held between the crosshead 7 and a table 2. By this constitution, the material testing apparatus is made structurally simple, enhanced in reliability and can be made hard to generate backlash.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a material testing device that loads a test piece by moving a crosshead.

[Prior art 1] A conventional material testing device that moves the crosshead to apply a negative VJ to the test tube Φ on the test specimen has two wooden screw rods installed on the table, and the crosshead is connected to the crosshead via a nut screwed onto the screw rods. It is customary to attach a screwdriver to this and move the crosshead while rotating the screw rod using a motor.

[Problems to be Solved by the Invention] However, the conventional testing device requires a complicated power transmission mechanism to convert the rotation of the motor into linear motion after decelerating it using a speed reduction device. In addition, backlash occurs in screws, gears, etc. in the drive system, causing the load to temporarily stop as shown in Figure 4 (a) and (b).
There was a problem in that it was not possible to perform tests such as dragon tests and high-speed response repetition tests accurately.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a material testing device that can perform accurate and fast-response tests by simplifying the crosshead drive mechanism and improve drive efficiency.

[Means for Solving the Problems] In order to solve the above problems, the present invention employs the following configuration.

That is, the material testing device according to the present invention takes a crosshead to a screw rod provided on a table and applies a test load to a test piece by rotating the screw rod to move the crosshead. The material testing device is characterized in that a direct drive motor is used as the rotational drive source for the screw rod, and a ball screw is used as the screw for the screw rod.

[Function j] The screw shaft is directly rotated by a direct drive motor, and the crosshead is attached via a ball screw that does not easily cause backlash, so the crosshead drive mechanism is simplified and backlash does not occur.

[Example] Fig. 1 shows an example of a material testing device according to the present invention, and this material testing device has a table 2 and a pair of left and right screw rods 3.4. The screws 35 and 4 are provided with a ball screw force on the outer periphery, and their upper ends are connected to the yoke 6.
is rotatably supported by. The screw head 3.4 is attached to the intermediate portion thereof via a ball screw nut 8.9 screwed onto the crosshead 7 or the ball screw of the screw rod 3.4.

The lower 98 portions of the screws 3.4 are fixed to the rotor 25 of a direct drive heater (hereinafter referred to as DO+-ta) 10 by a key 30 and a hinge 29, as shown in FIG. The DD motor 10 is equipped with the data 24 (the motor housing 23 is fixed to the table 2 with fastening bolts 28, and the thrust load receiver (the bearing 6) is installed between the motor housing 23 and the data 25 (through the motor housing 23). The left and right pair of DDTs IQ and 10 are respectively driven by the DD motor drivers 17 and 18, but when the DDTs 25 rotate, the screw shafts are rotated as described above. Since the lower end is fixed to the rotor 25, the screw rods 3.4 rotate together.When the screw rod 3.4 rotates, the ball screw threaded thereon (・8.9 is the direction of rotation). Move up and down depending on the ball screw nut 8.9
It can be attached to or the Ross head 7 can be moved up and down along the screw rod 3.4! 1Jllzuru.

Two I)D motors 10 that rotate the left and right screw rods 3.4
are synchronously rotated by component 1 caller 21.

An upper grip 12 is attached to the crosshead 7 via a load cell 11, and a lower grip shell 1 is attached to the table 2.
3 is attached, and the test piece 1 is attached by these two gripping shells.
5 is retained.

The load cell 11 is electrically connected to a controller 21 via a load measurement system 20.

The DD motor 10 is electrically connected to a controller 21 via a displacement measurement system 19 into which a position detection signal from an internal rotation detector is input.

When the two DD motors 10 are rotated synchronously by the motor drivers 17 and 18, the head 7 moves in the vertical direction, and the linear movement of the cross head 7 in the upward direction is connected to this. The test load is transmitted to the upper grip 12 and applied to the test piece 15 . The displacement of the test piece due to the load is measured by the displacement measurement system 19 based on the position detection signal from the D-D-E rotation detector, and the test load is measured based on the load signal from the load cell 11. Measured by System 2G.

This material testing device 1 (, t, DD momo as described above)
The test load 9 is applied to the test head 15 held between the crosshead 7 and the daple 2, which constitutes the drive mechanism of the head 7. Since it is configured to carry a load, it is structurally simple and highly reliable, and also has high driving efficiency and low power consumption when it is used as a mouthpiece. In addition, since a decelerator is not used and a bolt is used as the thread for the screw rod, backlash is less likely to occur, and therefore high-speed response is achieved. As shown in the figure, it can be done accurately and smoothly.

In the example above, the vertical testing machine was explained next, but
It can also be applied to horizontal testing machines.

[Effects of the Invention] Hereinafter, as is clear from the explanation of L, key 4 according to the present invention
Material Testing Equipment "tJ, 63, l) Since the crosshead is driven using a D motor and a ball screw, the structure of the drive mechanism is simple and backlash is less likely to occur. This makes it easy to transmit the force for loading the test piece. There is no loss, and it is suitable for repeated high-speed response tests, such as being able to smoothly carry out 9 consecutive loads during a tension-compression double-wall test, for example.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the configuration showing one embodiment of the present invention, Fig. 2 is an explanatory diagram of the main parts, Fig. 3 is a diagram showing changes in cart in the tension/compression double wall test using the embodiment device R, and Fig. 4 Figures (a) and (b) are diagrams showing changes in load in a tension/compression double-wall test using a conventional device. 1... Material testing device 2... Table 3.4...
・Screw mourning 7...Cross head 8.9...Small screw nut 10...Direct drive motor 12, 13...Seizing odor

Claims (1)

[Claims] (1) Direct drive as a rotational drive source for the screw rod in material testing equipment in which a crosshead is attached to a screw rod on a table, and the crosshead is moved by rotating the screw rod to apply a test load to the test piece. A material testing device characterized by using a motor and a ball screw as the screw for the screw rod.