JPH0774773B2 - Multiple automatic load mounting controller - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a multiple automatic test for quantitatively testing displacement with respect to pressure for a plurality of test pieces made of soil material, asphalt (paving material), cement, concrete and the like. The present invention relates to a load mounting control device.

[0002]

2. Description of the Related Art A conventional consolidation load mounting device includes a pressurizing device, which is composed of a cylinder and a piston inserted in the cylinder, between two load mounting plates for mounting a test load. An O-ring for airtightness is fitted on the outer circumference of the piston so that the piston and the cylinder are brought into contact with each other through the O-ring, and a pressurized fluid is applied to a space formed between the cylinder and the piston. The test piece abutting on the outer end of the piston rod is compacted by the feeding. Further, the means for switching the mounting pressure adopts a lever system, and the range of the mounting pressure is changed by changing the weight to be mounted on the lever. Moreover, one consolidation load mounting device is used. In this way, a consolidation test is performed on one test piece.

[0003]

However, since the cylinder and the piston are in close contact with each other via the O-ring in the above-described conventional compact load carrying device, the contact friction between the cylinder and the piston during pressurization. As a result, a part of the pressure is lost, and as a result, the pressure acting on the test piece and the mounting input (command value) are not equal, and the detected value is inaccurate.

Further, when the mounting pressure is switched from the low pressure region to the high pressure region, the load acting on the lever is added. Therefore, not only the handling is troublesome but also the caution is required, and it takes a long time. When loading the load in stages, it is necessary to control the time at all times and always be careful during the test. Also, since the load is hung by levers, the size of the device itself becomes large, and nevertheless only one test piece can be tested by one device. In order to obtain a large amount of data in order to increase the reliability of the test, prepare a large number of test pieces and test them one by one sequentially
If it takes several tens of days and a test is to be carried out in a short period of time (several days), it is necessary to secure a large number of consolidation load mounting devices, which is disadvantageous in that it is uneconomical. It was Therefore, the present invention intends to solve the above-mentioned drawbacks of the conventional example, and to provide an apparatus capable of accurately testing a large number of test pieces in a short time with high accuracy.

[0005]

Means for Solving the Problems A load-carrying device capable of switching the load-carrying load, and a load for controlling the load-carrying load on the load-carrying device by a detection output from the load-carrying device. A plurality of load mounting control devices each including a pneumatic device to unitize the load mounting control devices, and an operation signal for gradually increasing and decreasing the mounting load to each load mounting control device according to a program; It is composed of one computer which compares the detection output from the control device with the command value and outputs a correction signal for correcting the mounting load.

[0006]

The same number of test pieces are loaded in each of the plurality of load-mounting control devices, and the computer is started to supply compressed air of constant pressure to each load-loading device for a certain period of time to load the test pieces. To act. And the load placed on each load device (command value)
, And the load actually received by the test piece are compared by a computer, and from the comparison value, how much load should be applied next is calculated, and an operation signal to that effect is generated. The load is placed step by step while controlling the load.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the drawings. The multiple automatic load mounting controller shown in FIG. 1 includes an air supply device 33 and a load mounting device 1 as shown in FIG. And a plurality of load-mounting control devices including a load-carrying device 1 of which the load-carrying device 1 constitutes a heavy-load cylinder composed of an upper casing 3 and a lower casing 4, and a large-load cylinder is placed in the heavy-load cylinder. A piston for use 5 is vertically movably inserted, and a diaphragm is interposed between the large load cylinder and a side wall of the large load piston 5 opposed to each other to form a large load verofram cylinder. A lower casing 9 is attached to the working piston 5 so as to project downward from the lower casing 4. Further, a pressurizing projection 8 is made to face downward from the lower casing 9 in the large load piston 5, and a small load piston 6 is vertically slidably inserted, and the large load piston 5 and the small load piston 5 are inserted. A diaphragm for small load is formed by interposing a diaphragm between the side walls facing the piston 6.
Then, the shaft rod 7 of the small load piston 6 penetrates upward from the upper casing 3, and at the center thereof, the small load verofram cylinder including the large load piston 5, the small load piston 6 and the diaphragm is installed. An air supply hole communicating with the pressurizing chamber is formed, the pressurizing projection 8 is brought into contact with the upper surface of the lower pressurizing plate 10, and the upper casing 3 is attached to the lower surface of the supporting substrate 2.

Further, the lower pressure plate 10 is the support substrate 2
Are attached to the lower ends of the connecting rods 11, 11 ... that pass through, and the upper ends of the connecting rods 11, 11, ... Are fixed to the upper pressurizing plate 12, and the holding ring for the test piece 15 is provided on the supporting plate 2. The test piece mounting plate 13 on which 14 is mounted is fixed, and the load mounting plate 16 is left stationary on the upper surface of the test piece 15, and the upper end of the pressure rod of the load mounting plate 16 and the upper pressure plate 12 are placed.
A load detecting portion 23 'held by springs 24, 24 ... Is interposed between the load detecting portion 23' and the load detecting portion 23 'for a small load which is in contact with the upper end of the pressure rod in the holder 23 ( (100 kg)
Holder 2 with load cell 25 and elastic body 26 stacked in sequence
The load cell 28 for heavy load (2000 kg) is interposed between the upper surface of the upper lid 27 and the upper pressure plate 12 so as to be in contact with the lower surface of the upper lid 27. Then, the load mounting plate 1
A displacement gauge (dial gauge) 21 is interposed between a support arm 22 on the pressure rod 6 and a support rod 17 fixed on the test piece mounting plate 13 or the support substrate 2.

Further, the upper pressure plate 12 has a hook shape 2
A plurality of roll receivers 30 and 30 are provided so as to face each other, and a swing lever 19 is swingably pivoted on an upper end of a support rod 18 erected on the support substrate 2, and both end portions of the swing lever 19 are pivoted. The rolls 29, 29 pivotally mounted on the
Support on the underside of. A screw rod is provided on the outer end of the swing lever 19 and a balance weight 20 is movably mounted on the screw rod so that the load of each member acting on the load mounting plate 16 is zero when no load is applied. I am trying to adjust it.

Next, the air supply device 33 is, as shown in FIG. 1, a large-load berofram cylinder of the load mounting device 1, and
The accumulator tank 35 is connected to the two solenoid valves 34, 34 'for switching the passages leading to the bellows cylinder for small load, and the solenoid valves 36, 38 are respectively provided between the accumulator tank 35 and the compressor 39. The electro-pneumatic converter 37 is connected via the above, and the detected load from each load cell 25, 28 of the load carrying device 1 is input to the input / output port of the computer 41 via the amplifier 40 connected to each path. The electro-pneumatic converter 37 is operated by a control signal obtained by calculation in the computer 41, and thereby the load placed on the load carrying device 1 is controlled.

A plurality of air supply devices 33, 33 ... Are connected in parallel to the compressor 39, and output terminals a ₁ , a ₂ , a ₁ , a ₂ ... Of the air supply devices 33, 33. load rests device 1, 1 each air supply input terminal a of the _{'1, a' 2, a} '1, a' 2
Connect ... Further, each of the load detection terminals b ′ ₁ , b ′ ₂ , b ′ ₁ , b ′ ₂ ... Of the load mounting device 1, 1 ...
, Which is connected to the input terminals b ₁ , b ₂ , b ₁ , b ₂ ... Of the air-supplying device for receiving a control output from the computer 41 according to the detection value of each load-mounting device 1, 1. The multiple automatic load-mounting control device is configured to be input to the electro-pneumatic converter 37 of 33, and each automatic load-mounting control device is mounted on the machine base 31 and the mount 32 as shown in FIGS. 4 and 5. Each is arranged in a Hinata style.

Next, a series of operations will be described. First, the test piece 15 is loaded in the retaining ring 14 of each load mounting device 1, and the dial is set so that the weight of the upper pressurizing plate 12 and other parts does not act on the test piece 15 first. While watching the gauge 21, the balance weight 20 is used to adjust the load. Then, the computer 41 is programmed in advance to apply a load to be placed on the test piece, for example, to change the loading load stepwise at regular intervals, and the computer 41 is started by pressing the start button. That is, the compressed air from the compressor 39 is guided to the accumulator tank 35 via the electromagnetic valve 38, the electropneumatic converter 37 and the electromagnetic valve 36, and the electromagnetic valve 34 is opened first, so that the terminals a ₁ to a ′
It is supplied to the small load pressurizing chamber 6 ′ in the large load piston 5 of the load mounting device 1 via ₁ and presses the small load piston 6 to apply a pressure to the lower pressurizing plate 10.

The lower pressure plate 10 is connected to the connecting rods 11,1.
The test held by the test piece mounting plate 13 and the load mounting plate 16 between the support substrate 2 and the pressure plate 12 via the load detection unit 23 ′ via the load pressure detecting unit 23 ′. Pressurize the piece 15. The reaction force of the test piece at that time is detected by the load cell 25 for small load interposed in the loading system path of the above load, is input from the output terminal b ′ ₁ to the terminal b _{1 of the} amplifier 40, and is compared in the computer 41. A control signal for correction is input to the electropneumatic converter 37 while comparing the mounting load supplied from the solenoid valve 34 by the circuit and the load received by the test piece 15. Then, the electropneumatic converter 37 is operated according to the command value of the correction control signal to adjust the load acting on the small load piston 6. In this way, the physical properties of the test piece 15 with respect to the load are obtained by dividing the test piece 15 in a predetermined low load region in several steps and changing the load at regular intervals.

When the low load measurement is completed, the solenoid valve 34 is automatically closed and the solenoid valve 34 'is opened according to the program in the computer to open the compressor 39.
The compressed air from, and supplied from a terminal a ₂ a to _'2 through to load rests device 1 of the upper casing 3 and the large load piston 5 and the large the load diaphragm made of a large load for pressure chamber 5' in , Lowering the heavy load piston 5, lower casing 9
The lower surface of the lower pressure plate is pressed against the lower pressure plate 10, and the pressure at that time is applied to the test piece 15 in the same manner as in the small load measurement, the reaction force at that time is detected by the heavy load load cell 28, and the terminal b ' _The air pressure (carrying load) supplied to the computer 41 via b2 via ₂ and the electromagnetic valve 34 'is compared with the detected value from the load cell 28 so that the carrying load becomes equal to the detected value. The electropneumatic converter 37 is operated to control the loading load. That is, the mounting load is feedback-controlled by a part of the output of the load mounting device. Then, such control is performed for all of the plurality of load-bearing devices in the same manner to test a plurality of test pieces in substantially the same period.

[0015]

As described above, the present invention is configured to switch between the small-load berofram cylinder and the large-load belofram cylinder. Compared to miniaturization,
Since the mounting load can be easily changed by controlling the supply pressure or the supply amount of the compressed air, the automatic control by feedback is easier. In addition, the feedback control enables accurate detection of the load.

[0016] Then, the loading and unloading operations of the load are performed stepwise by the program of the computer, and the multiple type allows the test to be started simultaneously on a large number of test pieces. Data can be collected and accurate values can be obtained. In addition, since one load computer is used to operate a plurality of load-bearing devices, it is possible to easily change the test mode and measurement conditions by changing the program, and also to load a plurality of load-bearing devices. Since it is arranged in a tandem style, it is compact and does not require a large installation space. In addition, balance weights are applied to each load-carrying device so that no-load adjustment can be performed at the initial stage of the test, and the weight of the components that affect the measured values can be removed in advance, so highly accurate measured values can be obtained. Has excellent effect.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a system of a multiple automatic load mounting controller of the present invention.

FIG. 2 is a cutaway enlarged sectional view of a main part of the above automatic load mounting control device.

FIG. 3 is a right side schematic view of the same.

4 is a front view of the appearance of FIG. 2. FIG.

FIG. 5 is a right side view of the same device.

[Explanation of symbols]

 1 load mounting device 33 air supply device 34, 34 'solenoid valve 37 electro-pneumatic converter 41 computer

Front page continuation (72) Inventor Taisuke Fukunaga 1-11-1 Chuo-ku, Osaka City, Osaka Prefecture Marui Co., Ltd. (56) References JP-A-4-270937 (JP, A) JP-A-62- 12834 (JP, A) Actual public Sho 60-33387 (JP, Y2)

Claims (1)

[Claims] 1. A load-carrying device having a small-load berofram cylinder and a large-load belofram cylinder on a load-carrying axis, and air supply to the device by detection output from the load-carrying device. A plurality of load mounting control devices each including an air supply device configured to control the pressure, and a switching operation signal for gradually increasing and decreasing the pressure to be mounted on each of the load mounting devices according to a program. , A detection signal is compared with a command value to output a correction signal for correcting the load placed on the load-bearing device, and both load-bearing control devices are controlled by a single computer. Characteristic multiple automatic load-mounting control device.