JP4062163B2 - Spanner for impact tensile testing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention also relates to the impact tensile testing machine for a spanner.
[0002]
[Prior art]
The tensile impact tester grips both ends of the test piece with the upper and lower grips, pulls the test piece by driving the upper grip with a hydraulic cylinder at high speed, and detects the impact force when the test piece breaks with the load cell. The piston rod of the hydraulic cylinder is connected to a running jig for applying a tensile load after the speed of the piston rod is stabilized, and an upper gripping tool is connected to the tip of the running jig. On the other hand, the lower gripping tool is connected to the load cell. Each gripping tool has a nut portion, and is mounted by screwing the nut portion into the thread portion of the run-up jig and the load cell. At the same time, each pair of wedge-type gripping teeth closes and grips both ends of the test piece.
[0003]
[Problems to be solved by the invention]
After the upper end of the test piece is gripped by the upper gripper, the lower end is gripped by the lower gripper. At this time, when the nut portion of the lower gripping tool is rotated, the pair of gripping teeth rotate together, and the rotation reaches the running jig through the test piece and the upper gripping tool. The portion of the run-up jig connected to the upper grip is not particularly restricted in rotation, but the friction with the portion connected to the piston rod becomes rotational resistance, and the test piece may be twisted.
[0004]
An object of the present invention is to prevent twisting of a test piece when the test piece is mounted.
[0005]
[Means for Solving the Problems]
A spanner for an impact tensile tester according to the invention of claim 1 is a spanner used for rotating and screwing a pair of test piece grips of an impact tensile tester to a tester main body, wherein one gripper is used. A first holding part for holding, a second holding part for holding the other gripping tool, and an adjustment mechanism for adjusting the distance between the first and second holding parts; The tool is configured to be rotatable at the same time .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is an overall configuration diagram of an impact tensile testing machine in the present embodiment. First, the basic configuration will be described. A cross yoke 3 is bridged on a column 2 erected on a table 1, and a hydraulic cylinder 4 is fixed to the cross yoke 3. An upper grip 7 is attached to the piston rod 4 a of the hydraulic cylinder 4 via a running jig 5 and a grip base 6. On the other hand, a lower grip 9 is mounted on the table 1 coaxially with the upper grip 7 via a load cell 8. By holding both ends of the plate-like test piece TP on the upper and lower grips 7 and 9 and driving the hydraulic cylinder 4 to raise the upper grip 7 at a high speed, a high-speed tensile load acts on the test piece TP. The impact force when the test piece is broken is detected by the load cell 8 and used as test data.
[0007]
The detailed structure around the gripping tool will be described with reference to enlarged views of FIGS.
The run-up jig 5 includes a cylindrical body 5 a fixed to the piston rod 4 a of the hydraulic cylinder 4 and a rod 5 b slidably inserted into the cylindrical body 5 a, and the lower end of the rod 5 b is screwed into the gripper base 6. Combined. Tapered surfaces 5c and 5d are formed on the inner surface of the cylinder 5a and the outer surface of the rod 5b, respectively, and these tapered surfaces are initially in a non-contact state. Therefore, even if the cylinder 5a rises integrally with the piston rod 4a, the movement of the cylinder 5a is not transmitted to the rod 5b, that is, the upper gripping tool 7. When the cylindrical body 5a rises to some extent and the tapered surfaces come into contact with each other, the movement of the cylindrical body 5a is transmitted to the upper gripper 7 through the rod 5b while exhibiting a wedge effect. The reason for providing such a run-up jig 5 is to apply a tensile load to the test piece TP after the rising speed of the piston rod 4a is stabilized.
A rubber cushioning material 10, for example, is provided on the upper surface of the gripping tool base 6. When the test piece is broken, the cushioning material 10 hits the cylinder 5 a to protect the cylinder 5 a from impact.
[0008]
An upper grip 7 is connected to the lower end screw portion of the grip base 6. The upper gripping tool 7 is disposed on the upper part of the gripping teeth 7b, the taper nut 7a having a tapered surface at the lower end, a pair of wedge gripping teeth 7b having a tapered surface in contact with the taper surface of the taper nut 7a, and a taper. And a test piece gripping screw member 7c screwed into the nut 7a. A non-circular hole is formed in the center of the screw member 7c, and the screw member 7c can be screwed / retracted by inserting and rotating a tool (not shown) through this hole in the state of the upper gripper alone. When the screw member 7c is screwed downward in the drawing, the gripping teeth 7b are closed by the action of the tapered surfaces, and one end of the test piece TP can be gripped. Then, due to the wedge effect, the gripping force by the gripping teeth 7b increases as the tensile load increases.
[0009]
On the other hand, the lower gripping tool 9 includes a taper nut 9a and a pair of wedge-type gripping teeth 9b having a taper surface in contact with the taper surface T (FIG. 4) of the taper nut 9a. By screwing the tapered nut 9a into the threaded portion of the load cell 8, the lower gripping tool 9 is connected to the load cell 8, and at the same time, the pair of gripping teeth 9b are closed by the action of the tapered surfaces, and the lower end of the test piece TP. Can be gripped.
[0010]
As shown in FIG. 4, two sets of two-surface cut portions composed of a pair of opposed planes P are provided on the outer peripheral surface of the taper nut 9a. The plane P becomes a clamping surface when the taper nut 9a is clamped by a spanner 20 described later. Also, two sets of two similar cut surfaces are provided on the taper nut 7a of the upper gripping tool 7.
[0011]
A spanner 20 shown in FIGS. 5 to 7 is used to hold the test piece TP on the upper and lower grips 7 and 9 and attach it to the testing machine. The spanner 20 includes a lower spanner 22L with which a handle 21 is integrated, a square bar 23 erected on the lower spanner 22L, an upper spanner 22U that can be moved up and down and non-rotatably attached to the square bar 23, and an upper spanner 22U. And a fixing block 24 that is screwed to the lower surface. The upper spanner 22U is vertically adjusted along the square bar 23, a fixing screw is screwed into the screw hole 24a formed in the block 24, and the top end of the screw is pressed against the square bar 23. Can be fixed in position. In other words, the interval between the upper and lower spanners 22U and 22L can be arbitrarily adjusted. The upper and lower spanners 22U and 22L have the same shape, and the interval S between the sandwiching portions is substantially equal to the two-surface width W (FIG. 4) of the upper and lower taper nuts 7a and 9a. When viewed in the vertical direction, the upper and lower spanners 22U and 22L are completely overlapped.
[0012]
A procedure for mounting the test piece TP on the testing machine will be described.
First, with the upper gripper 7 removed from the gripper base 6, one end of the test piece TP is inserted between the pair of gripping teeth 7b of the upper gripper 7, and the screw member 7c is screwed. As a result, the pair of gripping teeth 7b are closed and the test piece TP is gripped. By providing the screw member 7c in this manner, the test piece TP can be gripped in the state of the upper gripping tool alone.
[0013]
Next, the upper grip 7 is connected to the grip base 6 by screwing the taper nut 7 a of the top grip 7 into the grip base 6. In the lower gripping tool 9, the taper nut 9a is loosely screwed into the load cell 8 so that the gripping teeth 9b are not closed. If the other end of the test piece TP is inserted between the gripping teeth 9b of the lower gripping tool 9 and the tapered nut 9a of the lower gripping tool 9 is screwed in, the gripping tooth 9b is closed and the other end of the test specimen TP can be gripped. it can. However, when the taper nut 9a is rotated, the gripping teeth 9b are also rotated together, and the rotation reaches the rod 5b of the running jig 5 via the test piece TP, the upper gripping tool 7 and the gripping tool base 6. The rod 5b is not actively prevented from rotating with respect to the cylindrical body 5a, and there is no problem if the rod 5b rotates without resistance. However, the friction between the rod 5b and the cylindrical body 5a is actually caused by the rod 5b. Therefore, when only the taper nut 9a is rotated, the test piece TP is twisted.
[0014]
Therefore, in this embodiment, the two-stage spanner 20 as described above is used when the lower gripping tool 9 is tightened. First, the interval between the upper and lower spanners 22U and 22L is adjusted according to the interval between the upper and lower taper nuts 7a and 9a. The upper spanner 22U is used to cut the two-side cut portion of the taper nut 7a, and the lower spanner 22L is used to adjust the two-side cut portion of the taper nut 9a. Each is pinched and rotated. Since the two-surface cut portion is provided so as to have the same top and bottom phases when the test piece TP is gripped by the upper and lower gripping teeth 7b and 9b, the upper and lower two-surface cut portions can always be sandwiched by the upper and lower spanners 22U and 22L. When the spanner 20 is rotated in this state, the upper and lower taper nuts 9a and 7a are rotated at the same time, and the same rotational torque can be given to the upper and lower ends of the test piece TP at the same time. Absent. Then, the lower end of the test piece TP is gripped by the rotation of the lower taper nut 9a, and the test piece mounting is completed. The upper taper nut 7 a rotates integrally with the grip base 6 and the rod 5 b of the run-up jig 5.
[0015]
The spanner 20 may be turned upside down, that is, the upper taper nut 9a may be sandwiched by the upper spanner 22U and the upper taper nut 7a may be sandwiched and rotated by the lower spanner 22L. Moreover, although the test piece gripping screw member 7c is provided on the upper gripping tool 7, it may be provided on the lower gripping tool or on both sides. If both the upper and lower grippers are provided in a single state, hold both ends of the test piece, and then attach the upper and lower grippers to the tester at the same time using the two-stage spanner as described above. Good.
[0016]
【The invention's effect】
According to tensile impact tester for spanner according to the present invention, first, the pair of jaws to be rotated simultaneously with the second clamping portion, thereby preventing twisting of the test piece during the test piece mounting.
[Brief description of the drawings]
FIG. 1 is a front view showing an example of an impact tensile testing machine.
FIG. 2 is an enlarged view of the main part of the testing machine, showing the vicinity of the upper and lower grips.
FIG. 3 is an enlarged view of the main part of the testing machine, showing the vicinity of the upper gripping tool and the run-up jig.
FIG. 4 is a half sectional view and a bottom view showing a tapered nut of a lower gripping tool.
FIG. 5 is a perspective view of a spanner used in the embodiment.
FIG. 6 is a plan view of the spanner.
FIG. 7 is a side view of the spanner.
[Explanation of symbols]
4 Hydraulic cylinder 4a Piston rod 5 Run-up jig 5a Tube 5b Rod 6 Grasp base 7 Upper grip 7a Taper nut 7b Grasp tooth 7c Test piece gripping screw member 8 Load cell 9 Lower grip 9a Taper nut 9b Grasp 20 Spanner 21 Handle 22L Lower spanner 22U Upper spanner 33 Square bar 34 Fixing block TP Test piece

Claims (1)

A spanner used for rotating and screwing a pair of test piece grips of an impact tensile tester to a tester main body, a first sandwiching part for sandwiching one gripper and a second for sandwiching the other gripper and the holding portion, these first shock and an adjusting mechanism for adjusting the distance between the second clamping portion, and the first, characterized in that the pair of jaws were rotatable in the same time in the second clamping portion Spanner for tensile testing machine.

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