JPS6230372B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hardening tester for mortar, etc., and more particularly to an automated Proctor penetration tester.

To measure the degree of hardening of mortar, etc. using a conventional hydraulic testing machine of this type, first attach a needle head to the cylinder shaft of a movable cylinder, and move the movable cylinder according to the height of the container filled with the sample. , place the container at a position corresponding to the needle head. Next, after a predetermined period of time has elapsed after pouring water into the cement, for example, 3 to 4 hours in the case of a test at normal mixing and normal temperature, the handle is rotated by hand, and the needle head perpendicularly penetrates into the cement at a speed of about 10 seconds per inch. First, read the load amount indicated by the needle of the load meter whose zero point has been adjusted, and calculate the penetration resistance by dividing by the area of the needle head used. After finishing, the needle head is wiped to completely remove any deposits, and the process is continued for a predetermined period of time, for example, at intervals of one hour, until the penetration resistance reaches 4000 psi.

As described above, all operating procedures of the testing machine for measuring the degree of hardening of mortar, etc. must be performed by a person, which has the drawback of being troublesome and wasting time.

The present invention aims to eliminate the drawbacks of conventional testing machines.The first invention is to penetrate the needle head into the sample, measure the load on the sample at that time, and measure the penetration resistance of the sample. The hardness tester is equipped with motors for driving the needle head and for driving the sample, a load cell, a displacement meter, a timer, and a display, and after the set time of the timer, the needle head is moved into the sample by the needle head driving motor. When the output of the displacement meter reaches the set value, the needle head drive motor is reversed to return to the initial position, the sample is moved to the next penetration position by the sample drive motor, and the output of the load cell is set. The second invention is characterized in that when the value is reached, the needle head drive motor is stopped or reversed to stop the needle head from penetrating the sample, and the penetration resistance is displayed on the display from the output of the load cell. In a hardening tester that penetrates the needle head into the sample and measures the load on the sample at that time to measure the penetration resistance of the sample, it is equipped with a motor for driving the needle head and a sample drive, a load cell, and a displacement meter. It is equipped with a touch detection switch, a timer, and a display, and after the time set by the timer, the needle head penetrates into the sample by the needle head drive motor, and when the touch detection switch detects that the needle head has contacted the sample, a displacement meter is used. When the value reaches the set value, the needle head drive motor is reversed to return to the initial position, the sample is moved to the next penetration position by the sample drive motor, and the load cell output is set. When the value is reached, the needle head drive motor is stopped or reversed to stop the penetrating operation of the needle head into the sample, and the penetrating resistance is displayed on the display by the output of the load cell.

Embodiments of the present invention will be described below with reference to the drawings.
In Fig. 1, 1 is a needle head, 2 is a needle shaft, 3 is a load cell, and a shaft 5 and other shafts 6 are raised and lowered by a jack 4.
I intervened between them. For example, the shaft 6 and the needle shaft 2 are connected by fitting the shaft 6 into a bottomed tube provided at one end of the needle shaft 2,
A touch detection switch 7 is embedded in the lower part of the shaft 6 and is closed (or opened) when its lower surface comes into contact with the bottom surface of the bottomed cylinder of the needle shaft 2. . 8 is an electric motor that drives the jack 4, 9 is an upper limit switch, 10 is a lower limit switch, 11 is an operating rod attached to the shaft 5 for operating the upper and lower limit switches 9 and 10, and 12 is the shaft 5.
This is a digital displacement meter operated by an operating rod 13 fixed to the base body (not shown). 14 is a container for storing the sample 15; 16 is a turntable rotated by a motor 17; and 18 is a gearbox containing a micro switch for regulating the rotation angle of the motor 17, which is fixed to a base 19. Reference numeral 20 denotes a brush that cleans the needle head 1 by reciprocating in the axial direction by a motor 22 fixed on the cover 21 and a rotation-linear conversion mechanism 23 equipped with a micro switch that regulates the number of times of cleaning. The load cell 3 is the second
As shown in the figure, it consists of a strain gauge 3 ₁ and a resistor 3 ₂ , and a pair of connection points 3 ₃ and 3 ₃ are connected to a power source 3 _4.
It is equipped with a bridge circuit in which the voltage corresponding to the load is output from the other pair of connection points 3 ₅ and 3 ₅ , and 3 ₁ and 3 ₂ are connected to each other with a maximum power supply voltage of 10 V.
At 700Ω, a voltage of approximately 10mV was output with a load of 200Kg. 3 ₆ and 3 ₇ are potentiometers and resistors for zero adjustment.

The digital displacement meter 12 is, for example, 50 mm or 10 μm.
This is a commercially available product that outputs one pulse with a displacement of .

Figure 3 is a block circuit diagram of the testing machine of the present invention.
The same parts as in FIG. 1 are indicated by the same symbols.

30 is an amplifier that amplifies the output voltage from the circuit of the load cell 3 shown in the second diagram, 31 is an A-D converter, 32 is an arithmetic circuit that converts the digital signal indicating the load into units of lb/in ² , and 33 is a peak hold. 34 is a register, 35 is a display, 36 is an overload detection circuit, 37 is an AND gate, 38 is a counter, 39 is a comparator, 40 is a controller, 41 is a clock, 42 is a motor 8, 17, 2
2 is a control circuit, 43 is an operation switch, and 44 is a printer.

The controller 40 includes, for example, a timer T ₁ that sets a predetermined time from the time when water is poured into the cement until the start of the penetrating operation of the needle head 1, a timer T ₂ that sets, for example, the time from the penetrating motion to the next penetrating motion, and the control circuit described above. 42, an arithmetic circuit 32, a peak hold circuit 33, a relay for controlling a register 34, and the like. (Timers T ₁ , T ₂ , relays, etc. are not shown.) The control circuit 42 for the motors 8 , 17 , 22 is a positive control circuit inserted into each circuit of the motors 8 , 17 , 22 and controlled to open and close by the relay of the controller 40 . Including switches such as a reverse switch, motors 8 and 1
7 and 22 are stopped, rotated forward, or reversed by control commands from the controller 40.

The overload detection circuit 36 detects when the detected penetration resistance exceeds a predetermined value, and is composed of, for example, a comparator, and generates an output signal when the signal from the arithmetic circuit 32 exceeds a set value.
This setting value can be changed.

Next, the operation of the testing machine of the present invention will be explained with reference to FIG. 1, FIG. 2, FIG. 3, and FIG. 4 showing a flowchart.

First, the sample 15 is placed in the container 14 and placed on the rotating table 16.
The needle head 1 of one of several thicknesses (for example, 1/10 in ² ) is attached to the tip of the needle shaft 2.

Next, set timer T ₁ to 3 hours, for example, and set timer T ₂ to 3 hours.
is set to 1 hour, for example, and the coefficient of the arithmetic circuit 32 is
Number of times of cleaning by brush 20 and overload detection circuit 3
Change the setting value in step 6.

When the above preparations are completed, close the operation switch 43 and apply an operation input to the controller 40. After the set time of timer _T1 , the relay operates and the motor 8
close the circuit and rotate motor 8, jack 4
to lower the shaft 5. The descending speed at this time is 1 inch in 10 seconds as described above, and when the tip of the needle head 1 passes through the hole in the cover 21 and contacts the sample 15, the needle shaft 2 stops and only the shaft 6 continues to descend. When the tip touches the bottom of the bottomed cylinder of the needle shaft 2, a micro switch, which is the touch detection switch 7, is operated by the bottom, and the tip of the shaft 6 then pushes the bottom of the bottomed cylinder and moves the needle shaft 2.
begins to penetrate into the mortar of sample 15 with a predetermined load. At the same time, an electric signal corresponding to the load is generated in the load cell 3, and this signal is converted into a digital signal by an A-D converter 31 via an amplifier 30, and is multiplied by a predetermined coefficient in an arithmetic circuit 32 to give a unit of penetration resistance (lb). /in ² ). The output signal of this circuit is input to the peak hold circuit 33, where the maximum value of the penetration resistance during the penetration operation of the needle head 1 is held, and this value is stored in the register 34 and displayed on the display 35.

On the other hand, when the shaft 5 moves, the digital displacement meter 12 starts operating by the operating rod 13 and outputs an electric pulse according to the amount of displacement, and the touch detection switch 7
When is activated, AND gate 37 is opened, so
The electric pulses from the displacement meter 12 enter a counter 38, where the number of pulses corresponding to the penetration distance of the needle head 1 into the mortar 15 is counted, and this number is determined as a number corresponding to a predetermined value, for example, 1 inch (25.4 mm). When the value is reached, an output signal is output from the comparator (size comparison circuit) 39, which energizes the relay of the controller 40.
A switch for forward/reverse rotation of the motor 8, which is interposed in the circuit of the motor 8 in the control circuit 42, is operated to the reverse direction to drive the shaft 5 upward. When the shaft 5 reaches the upper limit position, the operating rod 11 operates the upper limit switch 9 to open the circuit of the motor 8, so that the motor 8 stops.

When this upper limit switch 9 is activated, the motor 22
The switch 17 for energizing the motor 17 is closed, and the motor 22 reciprocates the brush 20 back and forth via the rotation-linear exchange mechanism 23 to clean the surface of the needle head 1. Also, the switch 17 for energizing the motor 17 is closed. The motor 17 rotates the rotary table 16, and when the rotary table 16 rotates by a predetermined angle, the micro switch in the gear box 18 operates to open the circuit of the motor 17 and stop the sample 15 at the next penetration position. let When the timer _T2 is activated after a set time elapses, for example one hour, after the shaft 6 reaches the upper limit position, the motor 8 rotates and the needle head 1 is activated.
is lowered, and the same operation as described above is performed thereafter.
This operation is performed a total of 15 times by timer _T2 . During this process, when the overload detection circuit 36 detects that the penetration resistance value has exceeded a set value, for example, 4000 psi, the motor 1 is stopped via the relay of the controller 40. (When the value exceeds the set value, operate the reverse switch to reverse the motor 8 and rotate the shaft 5.
(When the motor 8 reaches the upper limit, the motor 8 may be stopped by the upper limit switch 9.) In this case, data on the amount of penetration resulting in overload is left. If the needle head 1 penetrates the sample 15 by more than a set value due to some reason such as a malfunction and still continues to descend by the yawter 8, the lower limit switch 10 is actuated by the operating rod 11 to stop the motor 8.

The number of penetrations of the needle head 1 and the elapsed time are obtained by counting the outputs of the comparator 39 and the clock 41, and when these are input into the register 34, the display 35 displays the elapsed time and the number of penetrations together with the maximum penetration resistance. I can do it.

The display on the display 35 is maintained until the start of the next penetrating operation, and at the same time it is reset to zero by a reset signal from the controller 40.
The arithmetic circuit 32, peak hold circuit 33, etc. are also reset to zero at the same time, and a new calculation and peak hold are performed.

The printer 44 determines the penetration amount and maximum penetration resistance by inputting the outputs of the counter 38 and the peak hold circuit 33, and also determines the energization by combining the timers T ₁ , T ₂ , the clock 41 and the counter, and inputting the outputs of the counters. Each time is printed out.

In the above embodiment, the touch detection switch 7
Although a micro switch was used in the above, electrode plates may be provided on the bottom surface of the shaft 6 and on the bottom surface of the bottomed cylinder of the needle shaft 2. Also, if a micro switch is used, a counter will be activated when the micro switch moves from on to quickly. 38 may start counting. In addition, although this embodiment is configured to test one sample, when testing multiple samples, the data obtained from each system of testing machines is input into a common print controller. The printer can be omitted by inputting a print command with system identification added to a common printer and printing data for each system.

As described above, according to the present invention, the penetration resistance of the sample can be automatically measured, which makes the work easier and saves time compared to conventional methods. By using this method, it is possible to easily measure the penetration distance of the needle head into the sample without setting the position of the sample.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of essential parts of an embodiment of the present invention, FIG. 2 is an electric circuit diagram of a load cell, FIG. 3 is a block circuit diagram of the present invention, and FIG. 4 is a flowchart. 1... Needle head, 2... Needle shaft, 3... Load cell, 4... Jacket, 5, 6... Axis, 7... Touch detection switch,
8...Motor, 9,10...Upper and lower limit switch,
11, 13... Operating rod, 12... Digital displacement meter,
14... Container, 15... Sample, 16... Turntable, 18...
Gearbox, 19... Base, 21... Moisture-proof cover, 17, 22... Motor, 20... Brush, 23...
Brush drive mechanism, 31...A-D converter, 32
...Arithmetic circuit, 33...Peak hold circuit, 34...
Register, 35... Display, 36... Overload detection circuit, 37... AND gate, 38... Counter, 39
...Comparator, 40...Controller, 41...Clock, 42...Motor control circuit, 43...Operation switch, 44...Printer.

Claims (1)

[Claims] 1. In a hardening tester that penetrates the needle head into a sample and measures the load on the sample at that time to measure the penetration resistance of the sample, each motor for driving the needle head and for driving the sample and a load cell, a displacement meter, a timer, and a display device, and after a set time of the timer, the needle head penetrates into the sample by the needle head driving motor, and when the output of the displacement meter reaches the set value, the needle head driving motor The sample is moved to the next penetration position by the sample drive motor, and when the output of the load cell reaches the set value, the needle head drive motor is stopped or reversed to move the sample to the needle head. A hardening degree tester for mortar, etc., characterized in that the penetrating operation of the mortar is stopped and the penetrating resistance is displayed on a display by the output of a load cell. 2. In a hardening tester that penetrates the needle head into a sample and measures the load on the sample at that time to measure the penetration resistance of the sample, each motor for driving the needle head and sample drive, a load cell, and a displacement meter are installed. It is equipped with a touch detection switch, a timer, and a display, and after the time set by the timer, the needle head penetrates into the sample by the needle head drive motor, and when the touch detection switch detects that the needle head has contacted the sample, the displacement meter When the value reaches the set value, the needle head drive motor is reversed to return to the initial position, the sample is moved to the next penetration position by the sample drive motor, and the load cell output is set. Curing of mortar, etc., characterized in that when the value is reached, the needle head drive motor is stopped or reversed to stop the penetrating movement of the needle head into the sample, and the penetration resistance is displayed on a display by the output of a load cell. Degree testing machine.