JPS6142109Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a crosshead chuck mechanism mounting device for a material testing machine, and more particularly to an improvement in a crosshead chuck mechanism mounting device for a tensile testing machine for curved wire rods.

A conventional tensile testing machine cannot perform a tensile test on a curved wire as it is. In order to apply it to a conventional tensile testing machine, the curved material must be straightened in advance so that it can be attached to the tensile testing machine. The present invention provides an apparatus that allows such a curved material to be directly mounted on a tensile testing machine.

The present invention consists of a plurality of pillars 4 extending parallel to each other,
A pair of chuck mechanisms 7, 8 are provided which extend between the pair of crossheads 1 and 2 and pass through the support shafts 9 through the holes 11 of each of the crossheads 1 and 2, respectively, and which face each other between the crossheads 1 and 2. are provided at one end of each of the support shafts 9, and each of the support shafts 9 is connected to each of the crossheads 1 and 2 in the same direction as the opening and closing direction of the chuck mechanisms 7 and 8 by means of a rotary joint 10 in the hole 11. A swing operation mechanism 13 is transmission connected to the other end of each of the support shafts 9, and each of the support shafts 9 is connected to each of the crossheads 1 and 2 by the swing operation mechanisms 13. The chuck mechanisms 7, 8 are operated to change direction relative to the crossheads 1, 2 by swinging operation.

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

In the figure, 1 is the lower crosshead and 2 is the upper crosshead. The lower crosshead 1 is designed to be able to vertically slide along a pair of vertical connecting columns 4 that are erected on a fixed bed 3. The upper crosshead 2 is capable of vertically sliding movement along a pair of vertical connecting columns 6 that are set up on a lifting table 5 located above the fixed bed 3. In FIG. 1, only one column 4 is shown on the left side, but there is another column 4 located on the right side behind the column 6.

A chuck mechanism 7, 8 is attached to each crosshead 1, 2, respectively, and according to the present invention, the chuck mechanism 7, 8 is attached to the respective crosshead 1, 2 so as to be able to change direction. As a method for attaching each chuck 7, 8 to each crosshead 1, 2 so as to be able to change direction, for example, the support shaft 9 of the chuck mechanism 7, 8 is attached to each crosshead 1, 2 via a rotary joint 10. To explain in more detail about the chuck attached to the upper crosshead, the support shaft 9 of the chuck mechanism 8 is located in a large hole 11 drilled in the upper crosshead 2.
It extends upward from the inside, and its apex projects upward from the crosshead 2. The support shaft 9 is held within the hole 11 by a horizontal support shaft 12 so as to be rotatable around the shaft 12 . In other words, the support shaft 9 of the chuck mechanism 8
can be tilted left and right around an axis perpendicular to the plane of the paper in FIG. 1 (the axis indicated by 12 in FIG. 2). The permissible tilting angle can be approximately 20° left and right, for example. The top end protrusion 9a of the support shaft 9 is connected to an angle setting mechanism, that is, a swing operation mechanism 13. In the embodiment shown in the drawings, the angle setting mechanism 13 includes a plunger 15 and a cylinder 14 that can slide back and forth relative to the plunger 15. The tip of the cylinder 14 is connected to the top protrusion 9a of the support shaft by a connecting pin 16.
On the other hand, the tip of the plunger 15 is connected by a connecting pin 17 to a support frame 18 attached to the crosshead 2 so as to project from it. Therefore, when the support shaft 9 of the rotary joint 10 tilts from side to side in FIG.
The angle setting device, which consists of a plunger-cylinder mechanism, can expand and contract to follow the angle. Although this angle setting device can be fixed at a desired position,
Normally, it is preferable to make it freely expandable and retractable so that it can follow the tilting movement of the support shaft 9. This angle setting device can therefore also play the role of a damper.

The mechanism for the lower crosshead of chuck 7 is similar, and like reference numerals indicate like corresponding parts.

Since the chuck mechanism attachment mechanism of the present invention has the above-described configuration, both ends of the curved test wire are connected to the chuck mechanisms 7 and 8, respectively, so that the axis of the support shaft 9 of the chuck mechanism is in the direction of extension of both ends of the wire. Attach it so that it matches. In the present invention, the chuck mechanisms 7 and 8 are respectively attached to the crossheads 1 and 2 via the rotary joints 10, so that the curved test wire can be directly attached to the tensile testing machine. After the curved material is installed in this way, when a tensile test is carried out by gradually increasing the distance between the crossheads 1 and 2 (driven by a hydraulic mechanism as is well known), the curved material is gradually elongated. Depending on the size, the chuck mechanism is gradually oriented in the vertical direction. When the test wire breaks, use the angle setting device 1.
The cylinder plunger mechanism of 3 can function as a damper as well as a stopper,
This serves to cushion the shock movement of the chuck mechanism mounting portion and bring it to a standstill.

As explained above, the present invention spans a pair of crossheads 1 and 2 between a plurality of supports 4 and 6 that extend parallel to each other, and operates each chuck mechanism 7 and 8 to change the direction of each crosshead 1 and 2. Therefore, even if it is a curved test wire, it can be chucked directly to the chuck mechanisms 7 and 8. After that, a tensile load is applied to correct the curve of the curved test wire and when it is stretched, the chuck mechanisms 7 and 8 change direction accordingly.
Therefore, a tensile test can be performed without any problem. The present invention also relates to a crosshead type testing machine in which the crossheads 1 and 2 are moved along supports 4 and 6, thereby applying a tensile load to the test wire. Therefore,
A tensile load can be applied smoothly to the curved test wire, and a large tensile load can also be applied.

Further, in the present invention, the support shaft 9 is passed through the hole 11 of each crosshead 1, 2, and each chuck mechanism 7, 8 is provided at one end of each support shaft 9.
Each support shaft 9 is swingably attached to each crosshead 1, 2 by a rotary joint 10 in a hole 11. A swing operation mechanism 13 is transmission connected to the other end of each support shaft 9, and each swing operation mechanism 13 swings each support shaft 9 relative to each crosshead 1, 2. , each crosshead 1, 2
The swing operation mechanism 13 such as the cylinder 15
can be arranged on opposite sides of each chuck mechanism 7,8. Therefore, there is no problem with the installation space, and the direction changing stroke of the chuck mechanisms 7, 8 can be made sufficiently large.

Furthermore, for this type of curved test wire, it is mandatory to inspect the scale release state during the curve correction process. To achieve this, it is necessary to observe the test wire to be straightened and to observe the degree of straightening. On the other hand, in the chucking work of test wires, the test wires are usually inserted into the chuck mechanisms 7 and 8 from the front of the testing machine.
The insertion direction is perpendicular to the opening/closing direction of the chuck mechanisms 7, 8. The present invention was made taking into consideration the insertion direction of the test wire and the convenience of observing the test wire. In the present invention, the support shaft 9 of each chuck mechanism 7, 8 is attached so as to be swingable in the same direction as the opening/closing direction of each chuck mechanism 7, 8. The test wire can be oscillated in the same direction as the opening/closing direction, and can be changed direction in the direction perpendicular to the insertion direction of the test wire.
Therefore, after inserting the test wire, the operator can observe the test wire from the test wire insertion position from chucking to straightening and breaking the test wire, thereby providing a rational testing machine. For example, in the case of the test machine shown in Fig. 1, the chuck mechanism 7,
8 opens and closes in left and right directions when viewed from the front of the test machine. The test wire is inserted into the chuck mechanism 7 from the front of the test machine.
8, and is chucked in the left-right direction while being curved in the left-right direction. Therefore, the chuck state can be accurately observed from the front of the test machine. Thereafter, when a tensile load is applied to the test wire, each of the chuck mechanisms 7 and 8 moves to change direction in the left-right direction, and the test wire is straightened from curving in the left-right direction. Therefore, the test wire can be directly observed from the front of the testing machine, and the degree of straightening of the curvature can be observed.

Further, the present invention can open and close each chuck mechanism 7, 8 in the same direction as the direction of change of the chuck mechanism 7, 8, and chuck the test wire in the same direction as the direction of change of the chuck mechanism 7, 8. Therefore, when the chuck mechanisms 7, 8 operate to change direction and straighten the test wire, no slipping occurs between the chuck mechanisms 7, 8 and the test wire, and the test wire can be accurately chucked. Furthermore, due to the relationship between the opening/closing direction of the chuck mechanisms 7 and 8 and the direction of change of direction, the test wire is always chucked within a plane passing through the center of change of direction of the chuck mechanisms 7 and 8, that is, the center of rotation of the rotary joint 10. Therefore, the test wire can be placed and held on the load axis from the start of the test to the end of the test, and can be accurately tensile tested.

[Brief explanation of drawings]

FIG. 1 is a front view of a tensile testing machine equipped with an apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view of the upper crosshead. 1, 2...Crosshead, 7, 8...Chuck mechanism, 10...Rotary joint, 13...Angle setting device.

Claims (1)

[Scope of utility model registration request] A pair of crossheads 1 and 2 are spanned between a plurality of supports 4 and 6 extending parallel to each other, and a support shaft 9 is passed through each of the holes 11 of each of the crossheads 1 and 2. A pair of opposing chuck mechanisms 7 and 8 are connected to each of the support shafts 9.
At the same time, each of the support shafts 9 is attached to each of the crossheads 1 and 2 so as to be swingable in the same direction as the opening and closing direction of the chuck mechanisms 7 and 8 by means of a rotary joint 10 in the hole 11. , a rocking operation mechanism 13 is transmission connected to the other end of each of the support shafts 9, and each of the support shafts 9 is rocked with respect to each of the crossheads 1 and 2 by each of the rocking operation mechanisms 13, A chuck mechanism mounting device for a crosshead in a materials testing machine, characterized in that each of the chuck mechanisms 7 and 8 is operated to change direction relative to each of the crossheads 1 and 2.