JPH0725675Y2 - Tensile impact tester - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a tensile impact tester suitable for performing a low load tensile impact test of plastics and the like.

B. Conventional Technique FIGS. 3 and 4 show a conventional example of a jig device used in this type of tensile impact tester. This jig device includes a fixed jig connected to the fixed side of the load mechanism and a movable jig connected to the movable side. The movable jig is the movable rod 1.
A first connecting tool 2 screwed into the thread and having a parallel guide hole 2a formed therein.
And a connecting shaft 3 having a tapered surface 3a formed in the guide hole 2a so as to be movable in the axial direction and a parallel surface 3b formed above the tapered surface 3a, and a complementary shape of the tapered surface 3a. It has a tapered surface 4a and is externally inserted on the connecting shaft 3 to form a first connecting member 2
The second connecting tool 4 whose lower end is screwed to the fork, the two-pronged holder 5 to which the upper end of the connecting shaft 3 is screwed, and the two-pronged holder 5 pinched and held by the movable side end of the test piece TP. And a sandwiching member 7 connected to.

On the other hand, the upper fixed jig is a two-pronged holder 12 that is screwed onto the fixed rod 11 of the load mechanism, and is pinched and held at the fixed end of the test piece TP, and is connected to the two-pronged holder 12 with a pin 13. Sandwiching member
14 and.

A tensile impact test is performed as follows using such a jig device.

The second connecting tool 4 is set to the position shown in FIG. 3 by a load actuator (not shown), and from this state, the load actuator drives the first and second connecting tools 2, 4 downward. Connection shaft 3
The time until the taper surface 4a of the second connecting tool 4 contacts the tapered surface 3a of the second connecting tool 4 is the run-up section of the first and second connecting tools 2, 4.
The first and second couplings 2, 4 are accelerated to the desired speed in this section. Then, when the taper surface 4a collides with the taper surface 3a, an impact load acts on the test piece TP to break it. The load and displacement in the process are measured by a load cell and a displacement meter (not shown) and output to the recorder.

C. Problem to be Solved by the Invention However, for example, when an impact load is applied to a test piece made of plastic or the like in a high temperature tank, a clamping member is attached to the movable end of the test piece TP in the state shown in FIG. It was difficult to obtain highly accurate measurement data because the test piece TP was stretched due to the weight of 7, the pin 6 and the connecting shaft 3 being suspended.

The technical problem of the present invention is to reduce the weight of the jig acting on the movable end side of the test piece before the start of the test.

D. Means for Solving the Problem The present invention will be described with reference to FIG. 1 showing an embodiment. In the present invention, the test piece TP is installed between the movable member 1 and the fixed member 11 of the load mechanism. It is applied to a tensile impact tester for applying a tensile impact load. And the above-mentioned technical problem is
The engaging piece 51 attached to the movable side of the test piece TP, and the engaging piece 51
The test piece TP mounted with has a run-up area that includes the movable side and the proximal end side 30a to the open end side 30b so as to be movable, and the proximal end side 3
A projecting portion that forms a connecting portion with the movable member 1 at 0a and engages an engaging piece 51 at the open end 30b to apply an impact tensile force to the test piece TP.
A jig device having a movable jig 30 provided with 31 is provided, and an engaging portion of the engaging piece 51 with the protrusion 31 has an outer periphery of a connecting position between the engaging piece 51 and the test piece TP. It is solved by being provided on the side.

E. Action Test piece TP with engaging piece 51 attached prior to starting the test
The movable side end portion of (1) is included in the movable side jig (30). At this time,
Since only the weight of the engaging piece 51 acts on the test piece TP, undesired elongation of the test piece TP before the start of the test is suppressed and the measurement accuracy is improved as compared with the conventional case.

It should be noted that, in the above D and E for explaining the configuration of the present invention, the drawings of the embodiments are used to make the present invention easy to understand, but the present invention is not limited to the embodiments.

F. Embodiment FIG. 1 and FIG. 2 show an embodiment of a jig device used in the impact tester according to the present invention. In FIG. 1, reference numerals 1 and 11 denote a movable rod and a fixed rod of a load mechanism, and the impact test jig device is a movable jig 30 connected to the movable rod 1.
And the fixed side jig 40 connected to the fixed rod 11 and the test piece.
Engaging piece 5 sandwiched and held between the movable side end and the fixed side end of TP
It consists of 1,52.

The movable jig 30 is formed in a U shape, and its base end side 30a is connected to the movable rod 1 of the load mechanism and is an open end on the fixed rod side.
A jaw (projection) 31 is provided on the inside 30b so as to project inward. Here, the run-up section (region) extends from the base end side 30a to the open end 30b. A wall member is provided integrally with the U-shaped member on the back surface of the movable jig 30 so that the open end 30b does not expand due to impact force. Engaging piece 51 attached to the movable side of the test piece TP
Consists of two trapezoidal plates each having a tooth surface on one side, and is clamped and held by the bolt 32 on the test piece TP. The engaging piece 51 is located in the run-in section inside the movable jig 30, and
Is configured to be engaged with the jaw portion 31 after the run. The engaging pieces 51, 52 are preferably made of aluminum or titanium to reduce the weight.

The fixed jig 40 is formed in a U shape, and its base end side 40a is connected to the movable rod 1 of the load mechanism, and the fixed rod side open end is on the movable rod side.
A jaw 40c is provided on the inside of 40b so as to project inward. The engagement piece 52 attached to the movable side of the test piece TP is composed of two trapezoidal plates, and is clamped and held by the bolt 32 on the test piece TP. The engagement piece 52 is located inside the fixed-side jig 40, and the test piece TP is suspended by the engagement piece 52 on the jaw portion 41.

Figure 1 shows the positional relationship before the start of the test.
Is hung by engaging the fixed side engagement piece 52 with the jaw 41 of the fixed side jig 40, and the movable side engagement piece 51 is hung.
And is located on the proximal side 30a. Test piece TP
For the set, adjust the spacing between the upper and lower jigs 30 and 40
2 is inserted into the upper jig 40 from the front of the jig and is engaged with the jaw 41.

In this state, only the engaging piece 51 is suspended on the movable side end of the test piece TP, and the tensile load due to its own weight is smaller than in the conventional case, and the elongation of the test piece TP due to its own weight is suppressed. When the movable rod 1 is driven downward by the arrow by a load actuator (not shown), the movable jig 30 also starts moving downward. The movable jig 30 is accelerated to reach a desired speed while moving by a distance corresponding to the approach section, and when the jaw 31 collides with the engaging piece 51, an impact load acts on the test piece TP.

The displacement of the movable rod 1 during this period is detected by a displacement meter (not shown), and the load acting on the test piece TP is detected by a load cell (not shown).

The jig on the fixed side may be the same as that of the conventional example. Further, the movable side jig 30 which is cut out in a U shape is used, but in the case of a structure in which the test piece TP can be inserted from the jig front surface, the form is not limited to the embodiment. However, the present invention is not limited to a structure in which the test piece can be easily inserted and removed from the front surface or the back surface, and includes a case where the movable side jig completely surrounds the movable side of the test piece. Also in this case, the end of the movable jig on the fixed rod side is
It is an open end for inserting and removing the test piece in the load axis direction.

G. Effect of the Invention As described above, according to the present invention, since only the engaging piece is connected and suspended at the movable end of the test piece at the start of the test, the test piece by the jig's own weight is used. Elongation is suppressed, and especially when a test piece made of plastic or the like is installed in a high temperature tank and an impact test is performed, the measurement accuracy is improved. Since the engaging portion of the engaging piece with the movable jig is provided on the outer peripheral side of the connecting position between the engaging piece and the test piece, the engaging piece can be moved from the movable end of the test piece in the direction of the tensile load. It is not necessary to project, and the engagement piece can be configured to be small, and the elongation itself of the test piece due to the weight of the engagement piece can be suppressed to be small. Further, since it is not necessary to project the engaging piece from the movable side end of the test piece, the amount of projection of the entire jig from the movable side end of the test piece can be suppressed to be small. Therefore, particularly when the distance between the movable member and the fixed member of the load mechanism is limited, the maximum length of the test piece that can be mounted within the limited size can be increased, and the versatility of the device can be improved.

[Brief description of drawings]

1 is a front view showing an embodiment of the present invention, FIG. 2 is a perspective view thereof, FIG. 3 is a side sectional view showing a conventional example, and FIG. 4 is a front view showing a portion of a test piece thereof. . 1: drive rod, 11: fixed rod 30: movable side jig, 31, 41: jaw (projection) 40: fixed side jig, 51, 52: engaging pieces

Claims (1)

[Scope of utility model registration request] 1. A tensile impact tester for installing a test piece between a movable member and a fixed member of a load mechanism to apply a tensile impact load, and an engagement piece attached to the movable side of the test piece.
The test piece having the engaging piece mounted thereon has a run-up region that movably encloses the movable side from the base end side to the open end side, and the base end side is formed with a connecting portion with the movable member and has an open end. Has a jig on a movable side provided with a protrusion that engages with the engagement piece and applies an impact tensile force to the test piece, the protrusion of the engagement piece The tensile impact tester is characterized in that the engaging portion with is provided on the outer peripheral side of the connecting position between the engaging piece and the test piece.