CN201820152U

CN201820152U - Liquid level measuring and controlling system for brick making machine

Info

Publication number: CN201820152U
Application number: CN2010205626682U
Authority: CN
Inventors: 黄冬来
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-10-11
Filing date: 2010-10-11
Publication date: 2011-05-04
Anticipated expiration: 2020-10-11

Abstract

The utility model relates to the field of liquid level control, in particular to a liquid level measuring and controlling system for a brick making machine, comprising an ultrasonic wave liquid level detection circuit, a microprocessor, a keyboard, a display circuit and a liquid level control circuit, wherein the microprocessor outputs the keyboard and the display circuit and is connected with the ultrasonic wave liquid level detection circuit, the keyboard and the display circuit to realize two-way transmission. The liquid level measuring and controlling system measures the liquid level of a boiler mainly by the ultrasonic wave liquid level detection circuit, the strong intelligent function of a singlechip is used, and the keyboard displays and controls the liquid level, so that the system provided by the utility model has the advantages of reasonable design and high degree of automation and is stable and reliable to operate.

Description

A kind of brick machine liquid level controlling system

Technical field

The utility model relates to liquid level control field, particularly be a kind of brick machine liquid level controlling system.

Background technology

Traditional liquid level control overwhelming majority is a manual control, caused waste of manpower resource, the reliability of security simultaneously is not high, modern industry production be in one by labour-intensive, equipment is intensive to knowledge-intensive transforming process, in this course, Based Intelligent Control plays crucial effects undoubtedly.

The utility model content

The purpose of this utility model provides a kind of reasonable in design, automaticity height, stable and reliable operation brick machine liquid level controlling system.

The technical scheme that the utility model adopted is such: a kind of brick machine liquid level controlling system, comprise supersonic liquid level testing circuit, microprocessor, keyboard and display circuit, liquid level control circuit, described microprocessor output keyboard and display circuit, and be connected with keyboard and display circuit with the supersonic liquid level testing circuit, realize transmitted in both directions.

Described microprocessor adopts the AT89S51 single-chip microcomputer.

Described supersonic liquid level testing circuit is made up of two groups of ultrasonic transducers and ultrasonic transmitter-receiver, ultrasonic transducer is selected piezoelectric transducer for use, ultrasonic transmitter-receiver adopts the ultrasound chip of sonar ranging controller TL851 and sonar ranging receiver TL852, ultrasonic signal is by sonar ranging controller TL851 and sonar ranging receiver TL852 and peripheral cell generation, then by triode and transformer output, be delivered to ultrasonic transducer through triode, ultrasonic transmitter-receiver is by the single-chip microcomputer P1 mouth control of microprocessor.

Described liquid level control circuit adopts electric control valve DAC08328 bit resolution D/A conversion integrated chip.

By adopting the aforementioned techniques scheme, the beneficial effects of the utility model are: boiler liquid level is mainly measured by the supersonic liquid level testing circuit by this liquid level controlling system, and utilize the powerful intelligent function of single-chip microcomputer, keyboard shows and the control liquid level, reasonable in design, the automaticity height, working stability is reliable.

Description of drawings

Fig. 1 is the system architecture synoptic diagram of the utility model embodiment;

Fig. 2 is the utility model embodiment supersonic liquid level testing circuit figure;

Fig. 3 is the interface circuit figure of the utility model embodiment electric control valve DAC0832 and single-chip microcomputer;

Fig. 4 is the program flow diagram of the utility model embodiment microprocessor.

Embodiment

Further specify the utility model below in conjunction with the drawings and specific embodiments.

As shown in Figure 1, a kind of brick machine liquid level controlling system, comprise supersonic liquid level testing circuit 1, microprocessor 2, keyboard and display circuit 3, liquid level control circuit 4, described microprocessor 2 output keyboard and display circuits 3, and be connected with keyboard and display circuit 3 with supersonic liquid level testing circuit 1, realize transmitted in both directions.

As shown in Figure 2, described supersonic liquid level testing circuit 1 is made up of two groups of ultrasonic transducers and ultrasonic transmitter-receiver, ultrasonic transducer is selected piezoelectric transducer for use, ultrasonic transmitter-receiver adopts the ultrasound chip of sonar ranging controller TL851 and sonar ranging receiver TL852, TL851 is a digital integrated circuit, TL852 is an Analogous Integrated Electronic Circuits, these two chips have been widely used in the ultrasonic ranging system, it is static and piezoelectric transducer interface, ultrasonic signal is by TL851 and TL852 and peripheral cell generation, be delivered to ultrasonic transducer by triode and transformer then, this ultrasonic transducer integrates to be received and dispatched, and return signal also is by sending AT89S51 to after the processing such as TL851 and TL852.The ultrasonic transmitter-receiver of being made up of TL851 and TL852 has two kinds of working methods: single echo (single-echo) working method and many echoes (multi-echo) working method, so-called single echo mode of operation is waited for echoed signal after being meant and sending the INIT signal, then echoed signal is amplified and generates a logic high output at the ECHO pin, like this from INIT put high level to time of ECHO output high level be exactly that ultrasound wave is issued to the time that object returns that runs into.A plurality of echoes of many echoes mode of operation must once obtain in the emission, so just must be after ECHO exports high level, input high level and time-delay are not less than the pulse of 0.44ms on BINK, get back to low level again at the negative edge ECHO of pulse, can receive echo again.The measuring distance of TL851 is 6 inches to 35 feet, it has an internal oscillator that can use the starting of oscillation of low-cost external ceramic crystal oscillator, use the ceramic crystal oscillator of simple external interface and 420KHz, can drive a 50KHz electrostatic converter, the INIT pin of TL851 must just can be put high level after Vcc powers on 5ms, in the time of this 5ms, internal system is reset, and produces stable vibration.INIT puts after the high level, and TL851 is 49.4KHz with regard to transmission frequency, and amplitude is the train of impulses of 16 pulses of 400V, drives converter XDCH work.These 16 pulses are converted into ultrasound wave and launch in converter, behind 16 end-of-pulsings, still have the direct current of a 200V to work on to guarantee converter.When the outside 420KHz pottery of use crystal oscillator, the blanking of TL851 (BLNK) signal-inhibiting receives the echo in the 2.38ms, this echo may be to be caused by the noise that converter damped oscillation is produced, so the blanking characteristic forbids receiving and the echo of sensor at a distance of 1.33 feet object.If want to detect the object in 1.33 feet, can make and forbid that blanking (BINH) becomes high level to shorten blanking, make the sensor can receiving inputted signal.Blanking (BLNK) also can be used to close the reception input in single echo working method or many echoes working method and replacement ECHO is a logic low.Described microprocessor 2 adopts the AT89S51 single-chip microcomputer, two ultrasonic transmitter-receivers of P1 mouth control of AT89S51 single-chip microcomputer, and wherein, P1.0-P1.3 connects INIT, ECHO, BLNK, the BINH pin of ultrasonic transmitter-receiver 1 respectively; The INIT that connects ultrasonic transmitter-receiver 2 respectively, the ECHO of P1.4-P1.7, BLNK, BINH pin, be connected to the INIT pin by phase inverter, zero clearing P1.0, P1.4 start ultrasonic transducer emission ultrasound wave, unison counter begins counting, and constantly inquire about the state of P1.1 and P1.5, when P1.1 or P1.5 become high level, promptly receive echo, read the count value of counter, count value by counter can calculate from the emission ultrasound wave to the time of receiving echo, thereby calculated the distance of emission place to object.

As shown in Figure 3, described liquid level control circuit 4 adopts electric control valve DAC08328 bit resolution D/A conversion integrated chip, the signal that electric control valve received is a standard signal, compatible fully with processor, it is cheap, interface circuit and program are simple, and conversion and control is easy, have obtained using widely in scm application system.

As shown in Figure 4, described microprocessor 2 softwares are divided into master routine and interrupt routine two parts, and master routine is finished the control of initial work, each road ultrasonic emitting and reception order and write down hyperacoustic launch time.Work such as the reading of the main deadline value of interrupt service routine, distance calculation, result's demonstration or output.

More than show and described ultimate principle of the present utility model and principal character and advantage thereof; the technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the explanation just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications; these changes and improvements all fall in claimed the utility model scope, and the claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. brick machine liquid level controlling system, it is characterized in that: comprise supersonic liquid level testing circuit (1), microprocessor (2), keyboard and display circuit (3), liquid level control circuit (4), described microprocessor (2) output keyboard and display circuit (3), and be connected with keyboard and display circuit (3) with supersonic liquid level testing circuit (1), realize transmitted in both directions.

2. brick machine liquid level controlling according to claim 1 system is characterized in that: described microprocessor (2) adopts the AT89S51 single-chip microcomputer.

3. brick machine liquid level controlling according to claim 1 and 2 system, it is characterized in that: described supersonic liquid level testing circuit (1) is made up of two groups of ultrasonic transducers and ultrasonic transmitter-receiver, ultrasonic transducer is selected piezoelectric transducer for use, ultrasonic transmitter-receiver adopts the ultrasound chip of sonar ranging controller TL851 and sonar ranging receiver TL852, ultrasonic signal is by sonar ranging controller TL851 and sonar ranging receiver TL852 and peripheral cell generation, then by triode and transformer output, be delivered to ultrasonic transducer through triode, ultrasonic transmitter-receiver is by the single-chip microcomputer P1 mouth control of microprocessor (2).

4. brick machine liquid level controlling according to claim 1 system is characterized in that: described liquid level control circuit (4) adopts electric control valve DAC08328 bit resolution D/A conversion integrated chip.