JPH06194286A - Load placing and switching apparatus for compressive load tester - Google Patents

Abstract

PURPOSE:To automatically switch to place a load in order to remove an impact, since the impact is given to a sample by an abrupt change of the load when a weight is transferred to be suspended when the weight is manually placed or removed in the case where predetermined loads are placed on various load testers. CONSTITUTION:The load placing and switching apparatus for a compressive load tester comprises stairlike holding pieces 2, 2,... having a plurality of engaging steps b1, b2, b3,...bn) so placing weight rings a1, a2, a3,...an of several weights concentrically at a certain interval in lighter order from lower positions, a guide cylinder 11 suspended at an upper part from an end of a load placing lever 21 of the tester longitudinally via the centers of the rings a1, a2, a3,..., an) held by the steps b1, b2, b3,..., bn, and a weight engaging ring 16 so loosely engaged to be held at an outer periphery of the cylinder 11 as to rise or fall by a motor 6 at a lower side of the ring of the lowermost position, where, when the ring 16 is raised by the rotation of the motor 6, the weight rings are sequentially superposed with the ring a1 of the lowermost position to be received.

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 compression load tester used when carrying out a strength test of basic materials for construction such as concrete or soil or a strength test of various materials. is there.

[0002]

2. Description of the Related Art Conventionally, when measuring the internal stress with respect to continuous load changes of various materials, a large load switching is performed in parallel with a dedicated loading lever for each load for several loads. A built-in load lever is interlocked with the load switching range, and by switching the range, the weight is switched from the small load lever to the large load lever in a stepwise manner. If the width is small, the weight acting on one load-loading lever is artificially added, or by changing the ratio of the fulcrum of the load-lever, the strength change characteristics for one sample can be measured. It was measured quantitatively.

[0003]

However, the conventional apparatus using a plurality of levers has the drawbacks that the entire apparatus becomes large and the linkage mechanism between each lever and the switching range becomes complicated. With a means for artificially loading a load using one lever, when measuring a subtle change in the sample, the impact will occur on the sample due to the impact when weights are sequentially added. Considering this fact, adding weights has many problems such as being highly influenced by the skill level and the state of the body at the time of heavy load. 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 and complicated. SUMMARY OF THE INVENTION The present invention addresses the above-mentioned problems of the conventional examples and provides a device that is compact and can carry a large load change from a small load to a large load.

[0004]

[Means for Solving the Problems] Weight holding means for receiving a plurality of weights having several weights in order from the bottom in the order of lightness, and a weight holding means held by the holding means. Each of the weights is composed of a weight loading means that allows the weights up to a predetermined weight to be stacked and taken out, and a load range switching means that controls the weight loading means according to a designated set load.

[0005]

When the load required for measurement is set in advance by the range switching means, the weight loading means starts to operate accordingly, and the weights held in a stepwise manner by the weight holding means are sequentially stacked from the bottom. The weights are superimposed so that the additive cumulative value of the weights becomes equal to the load set by the range switching means, and the weights are operated so as to reach the set load
Input the load of various load testers.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the embodiments shown in the drawings. First, the outline of the construction is as follows: weight holding means A for receiving a plurality of weights, and weight loading means for sequentially taking out the weights. B and load range switching means for setting the load.
Next, the weight holding means A includes the adjusters 20, 20,
The weight holding pieces 2, 2, ... Are oriented toward the center of the outer cylinder 1 with an arrangement angle of 120 ° (in case of three pieces) inside the cylindrical outer cylinder 1 on the base plate 19 supported by. Are radially protruded, and the inner edges of the holding pieces 2, 2, ... Forming staircase-like latching step portions b ₁ , b ₂ , b ₃ , ..., B _n , that is, the latching step portions of the respective holding pieces 2, 2 ,. Is formed at a position on the circumference such that the radius with respect to is large. Further, the weight loading means B is provided with a central hole 4 of the upper lid 3 provided at the upper end of the outer cylinder 1.
The upper end of the hanging rod 5 which vertically extends through is vertically connected to the tip of a load loading lever 21 provided in various compression load testers (not shown), and the central portion of the buffer plate 9 is attached to the lower end of the hanging rod 5. ,
A support plate 10 on which the electric motor 6 is mounted is connected to the end of the buffer plate 9 by two or more connecting rods 7, 7, ... Attach the upper end of 11,
The lower end of the outer cylinder 1 is fixed to the lower part of the outer cylinder 1 so as to prevent only lateral shake and rotatably hang down (supported by an upper bearing of a screw shaft described later when a load is loaded). A screw shaft 13 having an upper end connected to the output shaft end of the electric motor 6 is inserted in the central portion of 11 and a female screw body 14 that can move up and down in the guide cylinder 11 is screwed into the screw shaft 13. A weight retaining ring 16, which is fitted on the outer side of the guide cylinder 11 so as to be vertically slidable, is attached to the female screw body 14 by a screw through a slit 12 provided in the guide cylinder 11 in the vertical direction. , 2, ... Each of the weight rings a ₁ , a ₂ , a ₃ , ... a _n having different weights held by the respective hanging steps b ₁ , b ₂ , b ₃ , ... b _n , the lowest weight. The ring a ₁ is received from below. Here, the weight ring is designed such that the weight is gradually increased from the lowermost one to the upper one. For example, the weight rings a ₁ , a ₂ , a ₃ , ... A _n are 0.05 kg and 0.0, respectively.
05kg, 0.1kg, 0.2kg, 0.4kg, 0.8kg, 1.6kg, 3.
The weight is increased in the following equal ratio except for the first weight ring a ₁ such as 2 kg, 6.4 kg, 12.8 kg and 25.6 kg. Incidentally, a tachometer 8 capable of converting the rotation speed of the screw shaft 13 in the guide cylinder 11 from the rotation speed of the electric motor is provided on the upper surface of the electric motor 6, and the weight retaining ring is provided on the lower portion inside the outer cylinder 1. A sensor 18 for detecting the origin position of 16 and an operating piece 17 for operating the sensor 18 are provided, and a sensor (not shown) for detecting the lowering limit of the weight retaining ring 16 is provided. Although not particularly shown, the load range switching means is entirely constituted by an electric control system, and the load range instruction value provided on the control panel of the compression tester and the rotation speed of the electric motor 6 are interlocked with each other. The rotation speed of the electric motor 6 and the cumulative load of the weight ring are made to correspond to each other, and an arithmetic circuit, a comparison circuit, and the like for converting the value set by the load range into the actual load value are included.

The operation will be described below. In order to load a load of, for example, 0.05 kg on the sample on the operation panel of the compression load tester, first, a scale of 0.05 kg is set in the load range so that the electric motor 6 is screwed. Axis 13
Is rotated to raise the female screw body 14 so that the weight retaining ring 16 pulls up the weight ring a ₁ (0.05 kg), and the weight retaining ring 16 is elevated to a height at which it is removed from the retaining step b ₁ of the step-like holding piece 2. The position is detected by the tachometer 8 of the electric motor 6, and 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 measuring state is set. Therefore, simultaneously with the start of measurement, the load of the weight ring a ₁ acts on the screw shaft 13 via the weight retaining ring 16 and the female screw body 14 and is transmitted to the upper support plate 10 to connect the connecting rods 7, 7 ,. 9. The load is loaded on the load loading lever 21 protruding from the main body of the tester through the suspension rod 5. In this case, the lever 21 is tilted by the load, and the high-sensitivity tilt sensor attached to the lever 21 grasps the state, and at the same time when the measurement is started, the posture is electrically controlled to the horizontal state via the belt. When the load is loaded, the guide cylinder 11 holding the weight retaining ring 16 also moves up and down.

[0008] Subsequently, for example, 0.05 k is added to the sample.
To suspend a load of g (total 0.1 kg), set the load range to a scale of 0.05 kg, and the weight latch ring 16 is lifted by the rotation of the electric motor 6 and the weight ring a ₁ is moved in the same manner as the previous time. By mounting the weight ring a ₂ (0.05 kg) and separating it from the latching step b ₂ , the loads a ₁ and a ₂ are added to the support plate 10 to act. In other words, a load of 0.1 kg will be applied to the sample. Similarly, by sequentially switching the load range scales on the control panel of the tester, the weight rings corresponding to the indicated scales a ₁ (0.05 kg), 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 (2
A cumulative load of up to 5.6 kg, for example here 51.2 kg, will be hung on the load-loading lever. By thus raising the weight retaining ring 16, the lower weight ring sequentially receives the upper weight ring,
The cumulative load is applied to the suspension rod 5 to switch the load to the testing machine.

[0009]

As described above, according to the present invention, the weight ring having a small load is placed at the lowest position as described above, and the heavy weight rings are held concentrically in order toward the upper position at a certain interval, and this weight ring is placed at the lowest position. The load is accumulated by the upward movement of the weight ring so as to correspond to the set load, so that the load switching mechanism can be automated with a simple configuration. Also, by holding multiple weight rings of different weights concentrically, it is very compact and does not occupy a lot of space. In addition, it has been unitized so that it can be used while being stored in the outer cylinder. It can be easily used with a machine. Further, since the weight loading means is suspended via the buffer support plate at the lower end of the suspension rod that hangs at the end of the load loading lever of the tester, the impact that occurs when the load is switched is damped to the suspension rod. It has many excellent effects such as highly reliable measurement data because it does not significantly affect the sample and therefore does not change the sample due to impact.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a device of the present invention.

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 outer cylinder 2 step-shaped holding piece 5 suspension rod 6 electric motor 11 guide cylinder 13 screw shaft 16 weight retaining ring 21 load loading lever A holding means B weight loading means a ₁ , a ₂ , a ₃ , ... a _n weight ring b ₁ , b ₂ , b ₃ , ... b _n

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

Claims (1)

[Claims] 1. A weight holding means in which a plurality of weights having several weights are placed in order from the bottom in order from the bottom at a certain interval, and weights held by the holding means are lowered. And a weight range loading means for controlling the weight loading means so as to take out a cumulative load equal to a previously designated load from the holding means. And a load loading switching device for a compression load testing machine, wherein the loading load can be selected by switching the range.