JPH07109388B2 - Load loading switching device for compression load tester - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load / load switching device of a compressive load tester used when performing a strength test on various materials such as concrete and soil.

[0002]

2. Description of the Related Art Conventionally, when measuring the internal stress of various materials with respect to continuous load changes, it is necessary to switch between loads with large loading widths, for several loads, a dedicated loading for each load. Lever is built in parallel, each loading lever is interlocked with the load switching range, and the weight is switched from the small load lever to the large load lever stepwise by switching the range. In the case where the load loading width is small, there is one in which a weight acting on one load loading lever is artificially added or the ratio of the fulcrum of the loading lever is changed.

[0003]

However, in the case of using a plurality of levers as described above, there are drawbacks that the entire device becomes large and the linking mechanism between each lever and the switching range becomes complicated, and one lever is used. In the case where a load is artificially applied using the lever of No. 2, when measuring a subtle change in the sample, the impact appears in the sample due to the impact when weights are sequentially added. Therefore, skill is required to add weight so as not to affect the sample, and in the case of a large load, there is a problem that the physical condition at that time is greatly affected.

Further, changing the fulcrum ratio of the lever is not suitable for a large load, and there is a problem that the device is small but complicated.

As described in Japanese Patent Publication No. 49-16672, a weight holding means for holding a plurality of weights from a bottom at a certain interval in order from the bottom, and a weight holding means. The weight holding means for picking up the weights held by the means in order from the bottom up to a predetermined weight, and the load range switching means for taking out a cumulative load equal to a predetermined load from the weight holding means. As is known, it must always be supported with the load shaft fully loaded, and
Since the support frame that lifts unnecessary weights during the test moves circularly, it is necessary to guide it so that it moves vertically, which complicates the structure as a whole and increases the number of parts and raises the cost. there were.

The present invention has been made in view of the problems of the above-mentioned conventional example, and is capable of switching a load having a large width from a small load to a large load with a compact size and a simple structure. (EN) Provided is a load loading switching device for a compression load paper construction machine capable of performing.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a plurality of weight holding pieces each having a step-like hooking step portion formed inside the outer tube and having a radius gradually increasing upward from the center of the outer tube. Are arranged radially, and a weight holding means in which a plurality of weights are placed in order from the bottom to each hanging step portion of this weight holding piece, and a screw shaft connected to the electric motor are located at the center of the outer cylinder. The weight loading means provided with a weight retaining ring that is lifted up and down along the screw shaft, and the weight loading means and the electric motor of the weight loading means are controlled so that the accumulated load is equal to the designated load. The load range switching means for taking out the weights placed on the retaining steps of the weight holding pieces in order from the bottom through the weight retaining ring.

[0008]

When the load required for measurement is designated by the load range switching means, the electric motor operates and the screw shaft is rotated. Since the rotation of the screw shaft raises the weight retaining ring, the weight rings placed on the weight holding pieces are taken out in order from the bottom. When the accumulated value of the weight ring taken out becomes equal to the load designated by the range switching means, the rotation of the screw shaft is stopped and the load input of the load tester is made.

As a result, the load can be switched by a simple structure in which the screw shaft is rotated by the required number of rotations via the electric motor, and the whole is housed in the outer cylinder and formed into a compact size. As a result, the number of parts can be reduced, the cost can be reduced, and the device can be installed in a small space.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the load / load switching device of the present invention, a weight holding means A for holding and holding a plurality of weights and a weight for taking out the weights in order. It comprises a loading means B and a load range switching means for setting a loading load.

The weight holding means A has a cylindrical outer cylinder 1 erected on a base plate 19 supported by a plurality of adjusters 20, and 120 degrees from the inner peripheral surface of the outer cylinder 1 toward the center. It is composed of the weight holding pieces 2 radially arranged at intervals. Then, each weight holding piece 2 has a stepped hook whose inner end edge projects toward the most center of the outer cylinder 1 at the lower end and is near the inner peripheral surface of the outer cylinder 1 at the upper end. Stop portions b ₁ , b ₂ , ... B _n are formed. That is, the hooking step b ₁ of each weight holding piece 2,
b ₂ , ... B _n are formed at positions on the circumference such that the radius from the center of the outer cylinder 1 increases as it moves upward.

Then, each hooking step portion b of the weight holding piece 2
_1, b _2, ... in the b _n, respectively weight ring a ₁ to weightless different, a _2, ... a _n and is mounted, the weight ring a _1, a _2, is ... a _n, the lowest It is set so that the weight gradually increases from the upper one to the higher one. For example, the weight rings a ₁ , a ₂ , ... A
_n is 0.05 kg, 0.05 kg, 0.1 kg,
0.2kg, 0.4kg, 0.8kg, 1.6kg, 3.2kg,
Like 6.4 kg, 12.8 kg, and 25.6 kg, the weight increases in the following geometric progression except for the first weight ring a ₁ .

Further, the weight loading means B comprises a support plate 10
Installed on the lower surface of the support plate 10, and a screw shaft 13 whose upper end is connected to the output shaft of the electric motor 6 at the center of the guide cylinder 11.
And a weight retaining ring 16 which is connected to a female screw body 14 screwed to the screw shaft 13 and is fitted into the guide cylinder 11 and slidable along a slit 12 formed in the vertical direction thereof. are composed of, the weight locking ring 16, each hanging ledge portion b ₁ of the weight holding piece 2 described above, b _2, ... b different weights of each weight is held in the _n ring a _1, a _2, ... of a _n, are arranged to support the lowest weight ring a ₁ from below. The weight loading means B is hung and connected to the tip of a load loading lever 21 provided in various compression load testers (not shown). That is, the upper end of the hanging rod 5 which vertically penetrates the center hole 4 of the upper lid 3 provided at the upper end of the outer cylinder 1 is connected to the tip of the load-loading lever 21 continuously, and the lower end of the hanging rod 5 has the center of the buffer plate 9. The support plate 10 on which the electric motor 6 is mounted is connected to the buffer plate 9 at a position close to the edge of the buffer plate 9 by two or more connecting rods 7.

As described above, since the weight loading means B is suspended by the suspension rod 5 suspended from the load loading lever 21 via the buffer plate 9, the impact generated at the time of load switching can be attenuated and the weight loading means B can be suspended. There is an advantage that the rod 5, that is, the sample is not affected by the impact, and highly reliable measurement data can be obtained.

The guide cylinder 1 is provided on the upper surface of the electric motor 6.
A rotation meter 8 is provided so that the rotation speed of the screw shaft 13 inserted in the motor 1 can be converted from the rotation speed of the electric motor, and the origin position of the weight retaining ring 16 is provided at the bottom of the outer cylinder 1. A sensor 18 for detecting and an actuating piece 17 for operating the sensor 18 are provided, and a sensor (not shown) for detecting the lower limit of the weight retaining ring 16 is further provided.

The lower end of the guide cylinder 11 is held by a receiving member 15 provided at the lower portion of the outer cylinder 1 while preventing lateral vibration.

On the other hand, although the load range switching means is not shown in detail, it is entirely constituted by an electric control system, and the load range instruction value and the rotation speed of the electric motor 6 provided on the control panel of the compression tester are set. It is composed of an arithmetic circuit, a comparison circuit, and the like, which are interlocked with each other and convert the number of revolutions of the electric motor 6 and the accumulated load of the weight ring into a value designated by the load range to be an actual load value.

The operation of this embodiment will be described below.
For example, to load a sample with a load of 0.05 kg on the operation panel of the compression load tester, first specify the scale of 0.05 kg in the load range, and the electric motor 6 rotates the screw shaft 13 to move the female shaft. Raise the screw body 14.
As a result, the weight retaining ring 16 becomes the weight ring a.
₁ (0.05 kg) is supported and lifted, and lifted to a height at which the weight holding piece 2 is detached from the hook step b ₁ . Raising to this height position is grasped by the tachometer 8 of the electric motor 6, and when the set rotational speed is reached, the rotation of the electric motor 6 is stopped. At this time, the lower end of the operating piece 17 is disengaged from the sensor 18 and the automatic circuit is unlocked, and the measurement state is set.

Therefore, at the same time when the measurement is started, the load on the weight ring a ₁ is determined by the weight retaining ring 16 and the female screw body 14.
Acting on the screw shaft 13 via the
Further, it is loaded onto the load loading lever 21 protruding from the tester main body through the connecting rod 7, the support plate 9 and the suspension rod 5. In this case, the loading lever 21 is inclined by the load,
By detecting this tilted state by a high-sensitivity tilt sensor attached to the lever 21, at the same time as the start of measurement, the posture is electrically controlled to a horizontal state via a belt (not shown). When the load is applied, the guide tube 11 holding the weight retaining ring 16 also moves up and down.

Further, subsequently, in the sample, for example,
To load a load of 0.05 kg (total of 0.1 kg), the load range is set to a scale of 0.05 kg, and similarly, the weight retaining ring 16 is lifted and the weight ring a ₁ is weighted. The ring a ₂ (0.05 kg) is supported and separated from the hook step b ₂ . As a result, the loads of the weight rings a ₁ and a ₂ are added to the support plate 10. In other words, a load of 0.1 kg acts on the sample. Similarly, by sequentially switching the load range scales on the control panel of the tester, the weight ring a ₁ (0.05k
g), a ₂ (0.05 kg), a ₃ (0.1 kg), a
₄ (0.2 kg) ... are selected in order from the bottom, and finally a _n
The accumulated load up to (25.6 kg), here 51.2 kg, acts on the load loading lever 21.

In this way, by raising the weight retaining ring 16, the lower weight ring sequentially supports the upper weight ring, and the load is switched to the testing machine while acting on the suspension rod 5 as a cumulative load. It is something to do.

[0022]

As described above, according to the present invention, a plurality of weights are formed inside the outer cylinder, in which a stepped hooking step portion whose radius from the center of the outer cylinder gradually increases toward the upper side is formed. The holding pieces are arranged radially, and a weight holding means in which a plurality of weights are placed in order from the bottom to each hooking step portion of the weight holding piece, and a screw shaft connected to the electric motor are located at the center of the outer cylinder. Positioned and suspended by a load loading lever, the weight loading means provided with a weight retaining ring that moves up and down along the screw axis and the electric motor of the weight loading means are controlled, and a cumulative load equal to the designated load is obtained. like,
Rotating the screw shaft by the required number of rotations via the electric motor, by configuring the weight placed on the retaining step of the weight holding piece from the bottom through the weight retaining ring and the load range switching means. The load can be switched with a simple structure that allows
Since the whole is housed in the outer cylinder and formed into a compact size, it is possible to reduce the number of parts, reduce the cost, and install in a small space.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of a load loading switching device of a compression load tester according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 outer cylinder 2 weight holding piece 5 suspension rod 6 electric motor 11 guide cylinder 13 screw shaft 16 weight retaining ring 21 load loading lever A weight holding means B weight loading means a ₁ , a ₂ , ... a _n weight ring b ₁ , b ₂ , ... b _n Locking step

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenichi Namba 2-26, Higashide-cho, Hyogo-ku, Kobe, Hyogo Prefecture Mitsuwa Engineering Co., Ltd. (72) Keiji Inoue 3--20, Nishimidoka, Toyonaka City, Osaka Prefecture No. 28

Claims (1)

[Claims] 1. A plurality of weight holding pieces are radially arranged inside the outer cylinder, and a plurality of weight holding pieces are formed, in which a stepped hooking step portion whose radius from the center of the outer cylinder is gradually increased as it goes upward. A weight holding means in which a plurality of weights are placed in order from the bottom to the respective hanging steps of the weight holding piece and a screw shaft connected to the electric motor are positioned at the center of the outer cylinder and suspended on the load loading lever. , A weight loading means provided with a weight retaining ring that moves up and down along the screw shaft, and an electric motor of the weight loading means are controlled so that the weight retaining piece has a retaining step so that the accumulated load is equal to the designated load. A load loading switching device for a compression load testing machine, comprising: a load range switching means for sequentially taking out the weights placed on the section through a weight retaining ring from the bottom.