JPS6333640A - Load applicator for constant load tester - Google Patents

Abstract

PURPOSE:To set a specified load accurately and quickly, by providing an opening at the center of a part where a constant load tester is placed to adjust and set a test piece. CONSTITUTION:An opening 30 of a support plate 14 is provided at the center thereof so as to coincide with the center of a constant load tester 12 to be placed thereon. In the procedure of setting a load, the length of an upper screw part of a test piece where to be engaged with an upper nut 24b is adjusted so that a lower spring seat 20a is extended enough in the length to engage with a lower nut 24a. Finally, with the load kept applied, a box spanner or the like is inserted from under the opening 30 of the support plate 14 to mount a lower nut 24a on a test piece 15. In this case, the load setting can be made without removing the previous load on the constant load tester thereby permitting a reduction in the variation range of a load to be set. Therefore, a handle 1 is reversed to remove the previous load and then, the constant load tester 12 with the load set is removed off a base plate 13. Thus, all setting work is completed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a load loading device for a constant load testing device for materials, and in particular, to quantify and accurately quantify stress, such as the constant load test method for stress corrosion testing. The present invention relates to a load loading device for a constant load test device suitable for cases where it is necessary to perform a large number of tests.

[Conventional technology]

Conventional equipment, as described in Japanese Patent Application Laid-open No. 60-73433, installs a hydraulic pressure generator, obtains pressure oil from the generator, and
A method was adopted in which a hydraulic motor was installed to output rotational driving force, and this hydraulic pressure was used to rotate a lifting nut to move the crosshead up and down, thereby applying a load to a constant load testing device installed on a table.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology mainly measures the load of the test device itself, that is, the measurement of compressive and tensile loads. Therefore, in order to accurately set the load of the test device on the built-in test piece while retaining the load applied to the test device, temporarily set it using a temporary setting jig, and then It was necessary to remove the constant load test device from the machine and set the test piece in place.

Therefore, even if the load on the test device itself is exactly ill! 1
Even if the set load could be set, the set load was not necessarily maintained accurately when the test piece was set in the test device, and there was a high possibility that the error would become large, especially when the temporary setting jig was removed. Therefore, if it is thought that an error has occurred, the process N must be repeated from the beginning.
It was inefficient.

In materials testing, where increasing the number of test pieces is important, variations in the set load 11 are a major negative factor. In addition, since the load-bearing device is large-scale, a lot of time is required for preparation and adjustment work.
For example, when verifying the load of a material test device in the reactor water environment of a nuclear couplant, there are many problems due to radiation exposure of the person being measured.

One object of the present invention is to provide a load loading device for a constant load test device that can accurately and quickly set a predetermined load.

[Means for solving problems]

In order to achieve the above-mentioned objective [1], the present invention provides a drive unit that applies a load to a constant load test device that applies a constant load to a built-in test piece, and an IW drive unit that mounts a constant 41f load test device. A load loading device PC for a constant load 1R test device, which consists of a support plate that supports the load, a compression plate that accurately opposes the tester and part of the constant load test device that measure the load applied from the drive part. The present invention proposes a load loading device for a constant load tester in which the support plate is provided with an opening for adjusting and setting the test piece (one part is provided in the center of the constant load tester mounting part).

The present invention also proposes a load loading device for a constant load test device, in which the compression plate is provided with a nut rotation stopper for preventing the upper nut that fixes the upper part of the test piece built into the constant load test device from slipping.

[Effect]

In the present invention, the opening part of the support plate is provided at the center so as to coincide with the center of the constant load testing device placed there. During this time, insert the adjustment tool into section 11,
The load of the test piece built into the test device can be easily set. In addition, since the load can be directly set without removing the constant load test device from the load application device, the working time can be significantly shortened and the fluctuation range of the load setting value can be reduced. Furthermore, the ``-starting load'' is directly calculated from 1-1 of the displacement meter of the detector.
It can be confirmed visually, there is no risk of underloading or overloading the constant load test device, and it is easy to operate.

〔Example〕

Before explaining the present invention in detail, the structure of the constant load test device will be briefly explained.

FIG. 13 is a longitudinal cross-sectional view showing the overall structure of the constant load test device. The constant load 1R test device includes a bell spring 21 and two sets of bell springs 21n connected in series.

21b and a pair of spring seats 20n and 20b that sandwich the spring 21 from both ends and grip the ends of the test piece 15.
, nuts 24a and 24b are tightened to maintain the spacing between the spring seats 2o at a predetermined value, a pair of sleeves 28n and 28b are used to align the load direction with the axial direction of the test piece 15, and the sleeves and the connecting guide are connected. A pair of connecting spring seats that receive one end of the Shirasara spring, scattering prevention covers 26a, 2f;b that prevent scattering when the test piece 15 breaks, and I tightening screws 25a that fix the scattering prevention cover 26 to the spring seat 2o. , 25
The present invention relates to a load loading device that sets a predetermined load to the spring seats 20Q and 20blllJ of such a constant load loading test device.

Hereinafter, preferred embodiments of the present invention will be explained with reference to FIGS. 1 to 12.

FIG. 1 is a longitudinal section r showing one embodiment of the load loading device of the constant load loading test device according to the present invention together with the constant load test device VC.
In figure 0, which is a +i figure, `` is the handle, 2 is the screw shaft that transmits the load, 3 is the holder of the screw shaft 2, 4 is the fixing plate that fixes the screw shaft 2 at the part, 5 is the whole branch, 6 is supported by the pillar and the load is transferred to the annular type 4. & A guide plate that conveys information to the vehicle tester 7, 8 is a dial gauge installed in the tester 7 to measure the applied load in terms of displacement, 9 is a base for the tester, 10 is a shaft that prevents the tester 7 from lifting up, 11 12 is a compression plate that transmits the load to the constant load test device, 12 is the constant load test device shown in FIG. 13, 13 is a base plate on which the constant load test device is placed, and 14 is a support for the constant load test device via the base plate 13. 15 is a test piece built into the constant load test device 12, 16 is an overall support, ]7 is a pressure plate inserted between the guide plate 6 and the tester 7, and 18 is a support plate around the holder 3. 19 is a nut rotation attached to the compression plate 12, 24b is an upper nut whose rotation is regulated by the nut rotation stopper 19, and 24a is tightened by a tool inserted through the hole 30 to apply a predetermined load to the test piece 15. This is Dobe Natsuto.

Note that, as shown in FIGS. 4 and 5, the guide plate 6 has a cutout at the portion that engages with the support column 5, and the handle 1
It goes down smoothly due to its rotation.

A feature of the present invention is that, as shown in FIGS. 2 and 3, an opening (hole) 3o for adjusting and setting the test piece 15 is provided in the center of the constant load test device mounting portion of the support plate 14. It is.

Another feature of the present invention is that a groove 31 is formed on the lower surface of the compression plate 11 as shown in FIGS. 6 and 7, and the groove 31 is inserted into the groove 31 as shown in FIGS. 8 to 10. A nut detent 19 is provided which has a key portion 29 and a pawl 27 that engages with the upper nut 24).

A method of applying a load to a constant load test apparatus using a load applying apparatus having such a configuration will be explained. The scattering prevention covers 26a and 26b shown in FIG. 13 are removed, and the bolts for fixing the constant load test device, which are not shown but are incorporated in place of the test piece, are removed. Next, the actual machine test piece 15 is inserted from the spring seat 20. Then, the upper nut 24b is attached, but the lower nut 24a is left unattached.

In this state, the constant load test device 12 is attached to the base plate 1 in FIG.
3, but before that, the center of the base plate 13 is aligned with the tester 7 and the compression plate 11,
Prevent eccentric loads from being applied to the constant load test equipment. The constant load test device placed on the base plate 13 is
Set it in the center of the support plate 14). This is to prevent torsional load from being applied to the constant load test device, as described above.

Here, as shown in FIG. 11, a nut rotation stopper 19 is attached to the upper spring seat 20b of the constant load test device. Since the upper nut 24b is sandwiched between the catches 27 and the key part 29 of the nut rotation stopper 19 is in the groove 31 of the compression plate 11, the upper nut 24b will not slip when tightening the lower nut 24a later. It will be hindered.

Now, when the handle 1 is turned, the screw shaft 2 pushes down the guide plate 6. The load transmitted from the guide plate 6 to the tester 7 is transferred to the tester base 9. Compression plate 11. It is finally transmitted to the constant load testing device 12 via the nut rotation stopper 19. The support plate 14 used has sufficient strength to withstand the above-mentioned load and does not cause deflection. Therefore,
The load value applied to the constant load test device appears as a displacement of the tester 7. This displacement is read by a dial gauge 8 provided at the center of the test. The load applied to each test piece 15 is converted into displacement in advance, and the load is gradually applied, and when the specified displacement is reached, the pressurization is stopped.

The load setting procedure around the lower part of the test piece is shown in Figure 12. Initially, it is in state A, but when a specified load is applied, it becomes state B. In this way, tighten the upper nut 2 so that the length enough to hang the lower nut 24a comes out from the lower spring seat 20a.
Adjust the length of the screw part on the top of the test piece 4b. 6. Next, while the load is still applied, insert a box spanner or the like from below the opening 3o of the support plate 14 to attach the lower nut 24a to the test piece 15. Then, the load setting is completed. In this case, unlike the conventional example, the load can be set without unloading the constant load test device, which has the effect of reducing the fluctuation range of the set load. Then, the handle 1 is turned in the opposite direction to remove the load, and the constant load test device 2, which has already been loaded, is removed from the base plate 13, completing the work.

As an application example, when verifying whether the load of the constant load test device that has already been set is correct or not, in order to measure minute displacements, a new displacement dial gauge (not shown) is installed on the test device on the reference line of the test device base 9. Set it to a position close to 7,
While looking at the displacement dial gauge, apply a load and look for the point where the scale of the displacement dial gauge changes suddenly. At this point, the test piece 15 of the constant load test device 12 and the bell spring 21 are balanced, that is, the load is applied to the test piece, and the load can be easily verified.

Furthermore, even if the above verification results in a value different from the specified value, it can be easily reset in the same manner as described above.

In particular, in the case of material testing, test results are often statistically processed and many test pieces are used, but with the present invention, it is possible to set loads with little variation, and the work can be done in a short time. Since this is possible, there are great advantages not only in terms of the reliability of the data obtained but also in terms of economics.

Note that the width of the load setting value of the constant load test device depends on the type of tester and the load value, but when using an annular tester as in this example, in the range of the set load of 10 to 1000 kg, It can be suppressed to approximately ±1' system.

(Effects of the Invention) According to the present invention, a predetermined load can be accurately and quickly set in a constant load testing device, and the already set load can be easily verified and corrected.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of the load applying device of the constant load test device according to the present invention together with the constant load test device;
The figure is a top view of the support plate, Figure 3 is a sectional view taken along line A-A in Figure 2,
Figure 4 is a top view of the guide plate, Figure 5 is 1'3- of Figure 4.
B sectional view, Fig. C) is a top view of the compression plate, Fig. 7 is a C-C sectional view of Fig. 6, Fig. 8 is a sectional view of the nut rotation stopper, and Fig. 9 is a top view of the nut rotation stopper. , Fig. 10 is a bottom view, Fig. 11 is a longitudinal cross-sectional view of the upper part of the test piece, Fig. 12 is a diagram showing the load setting procedure around the lower part of the test piece, and Fig. 13 is a longitudinal cross-sectional view of the constant load test device. It is. 1...Handle, 2...Screw shaft, 3...Holder, 4...Fixing plate, 5...Strut, 6...Kite handling, 7...Verifier, 8...Dial Gauge, 9...
Base for tester, 10°°・Shaft, 11... Compression plate, 12... Constant load test M1 [¥, 13... Base plate, 14... Support plate, 15°°. Test piece, 16... Support, 17... Pressure plate, 18...
...Holder rotation stopper, 19...Nut rotation stopper, 20
...Spring seat, 21... Separate spring, 22... Connection spring seat, 23... Connection guide, 24... Narrow 1~. 25
... Set screw, 26 ... Shatter prevention cover, 27 ...
・Claw, 28...Sleeve, 29...Ki part, :3
0...hole, 31...groove.

Claims (1)

[Claims] 1. A drive unit that applies a load to a built-in constant load test device that is to apply a constant load to a test piece, and a drive unit that places the constant load test device and supports it against the load from the drive unit. In the load loading device of the constant load test device, the load loading device includes a support plate and a compression plate that accurately opposes the test device for measuring the load applied from the drive unit and the upper part of the constant load test device. A load applying device for a constant load testing device, characterized in that the opening for adjusting and setting a test piece is provided in the center of a mounting portion of the constant load testing device. 2. The constant load tester according to claim 1, wherein the compression plate is provided with a nut stopper that prevents an upper nut that fixes the upper part of the test piece built into the constant load testing apparatus from spinning. Load loading device of load testing equipment.