JPS6222410B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to chucking and crosshead fixing devices for machines such as universal testing machines.

As a universal testing machine for material testing test pieces, a machine with a crosshead attached to a plurality of supports extending parallel to each other is generally used. Typically, the crosshead is movably guided along a column. The crosshead is provided with a plurality of clamp mechanisms, and each support column is tightened by the clamp shoe of each clamp mechanism, thereby fixing the crosshead to each support column. Furthermore, the test piece is chucked by a chuck on the crosshead. The specimen can therefore be subjected to material testing. The present invention was made for the purpose of simplifying the structure of the chucking and crosshead fixing device of this type of universal testing machine and other machines, and reducing the cost thereof.

In the present invention, a crosshead is attached to a plurality of pillars extending parallel to each other, the crosshead is movably guided along the pillars, a chuck for chucking a test specimen is provided on the crosshead, and a plurality of pillars are mounted on the crosshead. In a machine such as a universal testing machine, which is provided with a clamp mechanism, and the clamp shoes of each of the clamp mechanisms tighten the respective columns and fix the crosshead to each of the columns, the chuck is provided between the clamp shoes of each of the clamp mechanisms. A hydraulic jack is provided for operating the clamp shoe, the hydraulic jack is arranged in a direction perpendicular to the tightening direction of the clamp shoe, and a pin is provided between each of the clamp shoes and the hydraulic jack, and each pin is connected to the clamp shoe. The hydraulic jacks are disposed in a direction parallel to the tightening direction, and the hydraulic jacks are transmission-connected to the respective clamp shoes via the respective pins, so that each of the columns is tightened by a lateral component of the reaction force of the hydraulic jacks. It is characterized by the following.

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, a crosshead 1 has a plurality of columns 2,
2' so that it can be raised and lowered. The crosshead 1 is raised and lowered by, for example, a hydraulic jack for raising and lowering. The chuck 3 is of a wedge type and has a wedge 5. The wedge 5 is pushed down by the plunger 7 of the hydraulic jack 6, gripping the test piece 4 from both sides and chucking it.
The hydraulic jack 6 has ports 8 and 9.

Clamp mechanisms 10 and 11 for tightening to each support column 2 and 3 include clamp shoes 12 and 13,
Each clamp shoe 12, 13 can be tightened onto each post 2, 2' by pulling it inward. The hydraulic jack 6 is arranged between the clamp mechanisms 10 and 11. The hydraulic jack 6 and the plunger 7 are arranged at right angles to the tightening direction of the clamp shoes 12 and 13 of the clamp mechanisms 10 and 11. Each clamp shoe 12, 13 is connected to a pin joint 14, 15 provided on the hydraulic jack 6 via a pin 16, 17.

In the apparatus constructed as described above, when hydraulic pressure is supplied to the port 8 of the hydraulic jack 6, the plunger 7 is pushed down and the test piece 4 is chucked by the chuck 5 of the chuck 3. Check 3 of 5
The reaction force of the force pushing down the hydraulic jack 6 and the clamp mechanism 10, 1 against the pin joint 14, 15
It acts upward perpendicularly to the tightening direction of the clamp shoes 12 and 13 of No. 1. Therefore, the hydraulic jack 6 and pin joints 14, 15 are lifted upward, and the clamp shoes 12, 13 of each clamp mechanism 10, 11 are moved by the lateral component of the reaction force transmitted by the pins 16, 17. and is pulled inward, tightening each support column 2, 2'. Therefore, at the same time as the test piece 4 is chucked, the crosshead 1 is fixed to each support column 2, 2' by each clamp mechanism 10, 11. The amount of displacement of each clamp shoe 12, 13 is significantly smaller than that of the hydraulic jack 6 and pin joints 14, 15. Therefore, each clamp shoe 12, 13 clamps the column 2, 2' with a force significantly greater than the reaction force applied to the hydraulic jack 6, that is, the hydraulic pressure supplied from the port 8. When a large tensile load is applied to the test piece 4 during the test, the test piece is chucked with a corresponding force, but the crosshead 1 is clamped to the support by the clamping mechanisms 10 and 11 with a force that is sufficiently larger than that. 2 and 2', it can sufficiently withstand the test load.

When the test is complete, port 9 of hydraulic jack 6
Hydraulic pressure is supplied from the plunger 7, the plunger 7 is lifted, and the test piece 4 is released from the wedge 5 of the chuck 3. At the same time, the reaction force of the hydraulic jack 6 is also removed, and the clamp shoes 12, 13 of the clamp mechanisms 10, 11 are released from the supports 2, 2'. At this time, the crosshead 1 is supported by its lifting jack. When no test load is applied to the crosshead 1, the lifting jack alone is sufficient to support the crosshead 1.

As explained above, according to the present invention, the clamp shoes 12, 13 of the clamp mechanisms 10, 11
Hydraulic jack 6 for operating chuck 3 between
is provided, and the hydraulic jack 6 is connected to the clamp shoe 1.
2 and 13 in a direction perpendicular to the tightening direction.
Further, pins 16 and 17 are provided between each clamp shoe 12 and 13 and the hydraulic jack 6, respectively.
Each pin 16, 17 is arranged in a direction parallel to the direction in which the clamp shoes 12, 13 are tightened. The hydraulic jack 7 is transmission connected to each clamp shoe 12, 13 via each pin 16, 17. Therefore, when the test piece 4 is chucked by the hydraulic jack 6 and the chuck 3, each pin 16, 1
7 receives the reaction force of the hydraulic jack 6, and its lateral component force is transmitted to each clamp shoe 12, 13.
Therefore, each clamp shoe 12, 13 is operated by the lateral component of the reaction force of the hydraulic jack 6, and each support column 2, 2' is tightened. Moreover, when the hydraulic jack 6 itself moves due to the reaction force of the hydraulic jack 6, and each clamp shoe 12, 13 moves due to its lateral component force,
Compared to the amount of movement of the hydraulic jack 6, the amount of movement of the clamp shoes 12 and 13 is extremely small. Therefore, the reaction force of the hydraulic jack 6 is magnified by each pin 16, 17, and a sufficiently large force is applied to each pin 12, 13. Therefore, each support column 2, 2' can be tightened with a sufficiently large force to firmly fix the crosshead 1. As a result, the test piece 4 can be chucked with a single hydraulic jack 6, and the crosshead 1 can be fixed at the same time. Therefore, each clamp mechanism 10,
There is no need to provide a special drive mechanism for operating the 11 clamp shoes 12 and 13, and the structure can be simplified and manufacturing costs can be reduced. Note that when the hydraulic pressure of the hydraulic jack 6 is released, the test piece 4 is removed from the chuck 3, and at the same time each clamp shoe 12, 13 is moved to each column 2,
It is released from 2'. Therefore, the position of the crosshead 1 can be adjusted by moving the crosshead 1 along each post 2, 2'. after that,
Clamp show 1 of each clamp mechanism 10, 11
2 and 13, each support column 2 and 2' can be tightened to fix the crosshead 1 in any desired position.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the present invention, and FIG. 2 is a sectional view of FIG. 1. 1... Crosshead, 2, 2'... Support, 3...
...Chuck, 4...Test piece, 6...Hydraulic jack, 10, 11...Clamp mechanism, 16,17...
…pin.

Claims (1)

[Claims] 1. A crosshead is attached to a plurality of columns extending parallel to each other, the crosshead is movably guided along the columns, a chuck for chucking a test piece is provided on the crosshead, and a plurality of clamping mechanisms are provided on the crosshead. In a machine such as a universal testing machine, the chuck is operated between the clamps of each of the clamp mechanisms in a machine such as a universal testing machine, which is provided with a clamp shoe of each of the clamp mechanisms to tighten each of the columns and fix the crosshead to each of the columns. A hydraulic jack is provided, the hydraulic jack is arranged in a direction perpendicular to the tightening direction of the clamp shoe, a pin is provided between each clamp shoe and the hydraulic jack, and each pin is arranged in a direction perpendicular to the tightening direction of the clamp shoe. and the hydraulic jacks are transmission-connected to the respective clamp shoes via the respective pins, so that the respective supports are tightened by the lateral component of the reaction force of the hydraulic jacks. A chucking and crosshead fixing device featuring: