JPH0436436Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to a load detection device used for measuring loads in material testing and the like, and particularly to one capable of indicating the capacity thereof. [Prior Art] As a load cell (load detector) for measuring the load applied to an object to be measured in material testing, etc., a rod or a cylinder with a strain gauge attached to the surface is widely used. This type of load cell has various capacities, and the one with the optimum capacity is selected and used according to the load applied to the object to be measured, so that accurate measurement can be performed. [Problems to be solved by the invention] However, in the above conventional selective use of load cells, the capacity of the load cell installed in the testing machine is often misunderstood by the operator, and the equipment is There were problems such as damage and incorrect measurements. Therefore, an object of the present invention is to provide a load detection device that can display the capacity of a load cell while being installed in a testing machine. [Means for Solving the Problems] In order to solve the above problems, the present invention has the following configuration. In other words, it consists of a load cell that outputs an electrical signal according to the size of the load, and a connector for attaching the load cell to a testing machine or a test piece grip, and the load cell is fixed at a fixed position regardless of its capacity. The connecting device has a lock pin provided therein, and an actuation pin provided at different positions depending on the capacity for actuating the capacity display switch, and the connecting device has a single lock hole into which the lock pin is fitted; A plurality of actuation pin fitting holes are provided in which the actuation pins of each load cell having different positions depending on the capacity can be fitted, and in which actuation pin fitting hole the actuation pin is inserted. The present invention is characterized in that a capacity display means for transmitting a signal indicating the capacity of the load cell is provided. [Function] A connecting tool is attached to a material testing machine or a test piece gripping tool, and a load cell is attached to the connecting tool, whereby the load cell is attached to the material testing machine. When attaching a load cell to a connector, place the lock pin of the load cell into a single lock hole of the connector, and place the actuation pin for operating the capacity display switch in the appropriate position among the multiple actuation pin fitting holes. fit into something. Since the actuating pins are provided at different positions for each capacity of the load cell, the actuating pins of the load cells having different capacities are inserted into the fitting holes of the connector in a one-to-one correspondence. At this time, by inserting the actuation pin into any of the actuation pin fitting holes, the capacity display means is activated and a display corresponding to the capacity of the load cell is performed. [Example] FIG. 1 is a front view of a material testing machine using a load detection device that is an example of the present invention. Connection tool 3
is attached to the upper crosshead 2 of the testing machine main body 1, and a load cell 5 is attached to the connection surface 4 thereof. A grip 13 for gripping a test piece 14 is attached to the load cell 5. Figure 2 shows the load cell connector 3 and load cell 5.
A lock pin 9 and an operating pin 10 for operating a capacity display switch are protruding from the top surface of the load cell 5. As shown in FIG. 3, the connection surface 4 of the load cell connector 3 is provided with a single lock hole 6 and a plurality of operating pin fitting holes 7a to 7d arranged concentrically. The lock pin 9 of the load cell 5 is provided at a fixed position for each load cell of different capacity, so that the lock pin of each load cell fits into a single lock hole 6 of the connector 3.

[Table] In the above embodiment, a lit lamp was used as a display means for capacity determination, but in a computer-controlled test machine, as shown in Fig. 5 or 6, it is possible to hand
It may be configured to input a signal to the CPU, automatically calibrate the zero value, and display the capacity of the load cell connected to the CRT based on the signal. It is also possible to use other suitable display means, such as driving a digital display to display the capacitance. Further, although the connecting tool 3 is attached to the test machine main body, it may be attached to the test piece gripping tool side. At that time, a load cell is attached to the testing machine. Also,
Although the lock pins and the like are provided on the load cell side and the fitting holes are provided on the connector, they may be provided in the opposite manner, as long as the capacitance display signal can be taken out when the connector and the load cell are connected. The shape of the pin is not limited to the illustrated example. [Effects of the invention] As explained above, the load detection device according to the invention can display the capacity of the load cell while it is being installed, thereby preventing operational errors such as when an operator misidentifies the capacity of the load cell and performs a test. This has made it possible to avoid situations where test equipment is damaged or incorrect data is measured due to erroneous operation.

[Brief explanation of the drawing]

Fig. 1 is a front view of a material testing machine incorporating an embodiment of the present invention, Fig. 2 is a partial cross-sectional view of the joint between the load cell and the connector, viewed from the arrow A-A side in Fig. 3; 3 is a plan view showing the connection surface of the connector, FIG. 4 is a circuit diagram of the display means, and FIGS. 5 and 6 are circuit diagrams of different embodiments. 1...Material testing machine, 3...Load cell connector,
5...Load cell, 6...Lock hole, 7a-7d
...Operating pin fitting hole, 9...Lock pin, 10...
... Operating pins, 11a to 11d... Micro switches, 16a to 16d... Lighting lamps.

Claims (1)

[Scope of utility model registration request] It consists of a load cell that outputs an electrical signal according to the size of the load, and a connection tool for attaching the load cell to a testing machine or a specimen grip, and the load cell is installed at a fixed position regardless of its capacity. The connecting device has a single lock hole into which the lock pin fits, and an operating pin provided at different positions depending on the capacity to operate the capacity display switch. Therefore, a plurality of actuation pin fitting holes are provided in which the actuation pins of the load cells at different positions can be respectively fitted, and
A load detection device comprising a capacity display means for transmitting a signal indicating the capacity of the load cell depending on which operating pin fitting hole the operating pin is inserted into.