CN1163397A - Computerized pressure tester - Google Patents

Abstract

The computerized pressure measurer is for the strength measurement of cement, sandrock, concrete, mortar, cement-stabilized soil, asphalt concrete and other building material. It mainly consists of two-site controller, sensor, main measuring frame, computer and printer. During the automatic measurement, the computer controles the pressure test machine via the two-site controller, the physical quantity signal from sensor is processed by amplifier, A/D converter, and the computer and the data is printed.

Description

Computerized pressure tester

The present invention is a kind of Computerized pressure tester, is applicable to the strength test of building materialss such as cement, sandstone, concrete, mortar, cement stabilized soil, bituminous concrete.

Tradition is carried out on several different stage pressure testing machines the strength test of building materials, and these old-fashioned pressure testing machines nearly all adopt mechanical dynamometer.The numeral of producing both at home and abroad shows pressure testing machine in recent years, also all is to adopt manual operations that artificial reading, manually calculates and fill in test report at manual record.But because the precision deficiency of traditional pressure testing machine, test speed is slow, causes the sum of errors manual record of artificial reading, the artificial error of calculating easily, thereby influences the precision accuracy of test findings.

Purpose of the present invention just is to overcome the weak point of old-fashioned pressure testing machine mechanical type dynamometer, improve measuring accuracy, the mitigation technique working strength of workers reduces personal error, realization is finished the overall process of test by Computerized pressure tester automatic pressure control testing machine.

The present invention mainly is made up of two places controller, sensor, electrical testing main frame, computer, printer etc.It is characterized in that: the electric pilot mainboard is made up of amplification plate 4, A/D plate 3, expansion slot 16, power supply 7, expansion slot interface 13, motor switch socket 8, force transducer interface 9, displacement transducer interface 10, displacement transducer interface 11, supply socket 12; The two places controller is by relay 16 and relay 17 back in parallel serial connection computer relay normally open contacts 19, with two relays 18 and be connected on the power supply 23, electric capacity 24 and resistance 25 series connection backs also are connected in relay 17 two ends, switch 15 and switch 14 are connected between relay 18 and the relay 17 and the power supply 23 positive poles end that links, and relay normally open contact 20 and relay normally closed contact 22 series connection backs also are connected in switch 15 two ends with relay normally open contact 21.The present invention is through two places controller controlled pressure testing machine by computer, and measurand is converted to the simulation electric weight through amplifying plate by the sensor that is installed on the pressure testing machine, to simulate electric weight through A/D plate conversion again is converted to digital quantity and flows to computer and carry out data processing up to the printout test report, the realization test automation.The effect of amplifying plate is the weak electric signal that sensor is sent here, amplifies by resistance-capacitance network AD624 high-precision amplifying 30, in order to adapt to the needs of A/D plate.Be amplifier electrical schematic diagram of the present invention with reference to figure 2, it adjusts potentiometer VR1, VR2, VR3 can make amplifier be operated in linear zone, guarantees measuring accuracy. Integrated voltage stabilizer 27,28,29 is respectively MC7805, MC7809, μ A317, forms different voltage stabilizing values, in order to mate corresponding sensor.Signal after the amplification, carry out data processing by A/D plate and computer, computer sends the execution signal according to actual needs, triggering two places controller computer relay J D normally closed contact comes the startup of controlled pressure testing machine and closes, turns round and stop, and finishes test procedure.

Two places of the present invention controller can manually be controlled, and also can carry out computer and control automatically.

With reference to figure 4, its principle of manually controlling is: when pressing switch 15, relay 18 gets electric adhesive, and self-locking, and motor is turned round continuously, provides the pressure energy to pressure testing machine.When clicking switch 14, relay 18 dead electricity, other four relay normally open contacts 20 reset simultaneously, and motor shuts down.

Computer is the principle of control automatically: the duty of pressure testing machine, be to control by the instruction that computer sends, when computer internal relay 26 closures, computer relay normally open contact 19 closures in the controller of two places, relay 16, relay 17 are simultaneously, relay normally open contact 21 closures make relay 18 adhesives, the pressure testing machine operation.When computer relay normally open contact 19 disconnects and since relay 17 parallel connections electric capacity 24, so the effect of time-delay reset is arranged, make at first dead electricity of relay 16,, make relay 18 dead electricity by relay normally open contact 21 controls, relay normally open contact 20 resets, and pressure testing machine is out of service.Because two places controller control loop is to adopt low-voltage (direct current 24V) control, can the interference computer, therefore safe and reliable.

The process flow diagram that Fig. 1 controls automatically for Computerized pressure tester of the present invention.

The present invention is of many uses, can carry out the strength test of multiple building materials: as cement, sandstone, concrete, mortar, cement stabilized soil, bituminous concrete etc., spare the following controlled step of employing for various strength test computers:

Start-up system work, computer is read zero reading, wait command;

The two places controller is accepted computer command starting pressure testing machine motor;

Computer reads magnitude of voltage;

Judge whether magnitude of voltage makes mistakes:

If make mistakes, be-1 with load symbol value;

If there is not mistake, convert magnitude of voltage to load;

Judge that current load is whether greater than the peak load that has recorded:

Be the peak load that recorded if then put current load, and turn back to and get magnitude of voltage;

If not, judge then whether current load drops to 60% of peak load:

If not, then turn back to and read magnitude of voltage;

If current load drops to 60% of peak load, disconnect two places controller motor switch;

Utilize the peak load value to calculate, storage file, demonstration, printing.

Fig. 2 amplifies the plate electrical schematic diagram for the present invention

Fig. 3 is a Computerized pressure tester block scheme of the present invention

Fig. 4 is the utility model two places controller fundamental diagrams

Fig. 5 is electric pilot main frame of the present invention and notebook computer sensor link position figure

Fig. 6 Compaq 486 computers of the present invention are installed the locations drawing such as amplifying plate 4, A/D plate 3, expansion slot 5

Fig. 7 amplifies the locations drawing such as plate 4, A/D plate 3, expansion slot 5, power supply 7 for electric pilot main frame of the present invention

Computerized pressure tester of the present invention has desk-top and two kinds of types of portable type, is illustrated in figure 6 as platform machine formula, and it will amplify plate, the A/D plate is installed in COMPAQProlinea 4/33 computing machine, and the testing laboratory of existing computer all can install.Portable type electric tester configuration notebook computer NP-925 is as Fig. 5.

Claims (3)

1. Computerized pressure tester of being made up of two places controller, sensor, electrical testing main frame (1), computer (2), printer etc. is characterized in that: the electric pilot mainboard by A/D plate (3), amplify plate (4), expansion slot (5), power supply (7), motor switch socket (8), force transducer interface (9), displacement transducer interface (10), displacement transducer interface (11), supply socket (12), expansion slot interface (13) and form; The two places controller is by relay (16) and relay (17) back in parallel serial connection computer relay normally open contact (19), with two relays (18) and be connected on the power supply (23), electric capacity (24) and resistance (25) series connection back also are connected in relay (17) two ends, switch QA (15) and switch TA (14) are connected between relay (18) and the relay (17) and power supply (23) the positive pole end that links, and relay normally open contact (20) and relay normally closed contact (22) series connection back also are connected in switch QA (15) two ends with relay normally open contact (21).

2. Computerized pressure tester according to claim 1 is characterized in that amplifying plate integrated voltage stabilizer (27), (28), (29), is respectively MC7805, MC7809, μ A317, and amplifier (30) is a resistance-capacitance network AD624 high-precision amplifying.

3. one kind is carried out the automatically method of control of computer by the described Computerized pressure tester of claim 1 to pressure testing machine, it is characterized in that comprising the steps:

Start-up system work, computer is read zero reading, wait command;

The two places controller is accepted computer command starting pressure testing machine motor;

Computer reads magnitude of voltage;

Judge whether magnitude of voltage makes mistakes:

If make mistakes, be-1 with load symbol value;

If there is not mistake, convert magnitude of voltage to load;

Judge that current load is whether greater than the peak load that has recorded:

Be the peak load that recorded if then put current load, and turn back to and get magnitude of voltage;

If not, judge then whether current load drops to 60% of peak load:

If not, then turn back to and read magnitude of voltage;

If current load drops to 60% of peak load, disconnect two places controller motor switch;

Utilize the peak load value to calculate, storage file, demonstration, printing.

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