CN207096402U - Tongue tube detects circuit and its measuring instrument - Google Patents

Abstract

The utility model discloses a kind of tongue tube to detect circuit, including controller and electromagnet；Electromagnet is arranged in the bottom of tongue tube, and the I/O pins of the energization end of electromagnet and controller circuitry connect；Controller circuitry be used to sending when detecting the working condition of tongue tube control signal cause on electromagnet it is electric so that electricity and reading the working signal of corresponding tongue tube on electromagnet and judging the quality of tongue tube.The invention also discloses the measuring instrument for including tongue tube detection circuit.The utility model can realize the automatic detection of tongue tube quality；Used time, include the measuring instrument of the utility model circuit, due to realizing the automatic detection of tongue tube, so as to ensure that the metering reliability of measuring instrument and accuracy.

Description

Tongue tube detects circuit and its measuring instrument

Technical field

The utility model is more particularly to a kind of tongue tube detection circuit and its measuring instrument.

Background technology

With the development and the improvement of people's living standards of national economy technology, all types of measuring instruments has become Essential metering unit in the daily production of people and life, production and life to people bring endless facility.

At present, existing intelligence instrument metering is general uses tongue tube technology, and cardinal principle is that testing medium promotes impeller Rotate, while driven coaxial indicators turn, two permanent magnets, such every revolution, two tongue tubes are inlaid with pointer The adhesive successively in the presence of permanent magnet, so as to produce metering signal.In general, existing metering is entered using double dry-reed pipe Row metering；And when all adhesives simultaneously of two tongue tubes, intelligence instrument thinks magnetic disturbance be present, so as to start interference protection program And then valve is closed, play a part of preventing user from destroying function of measuring.But when two tongue tubes all disconnect or one disconnected When opening a closure, intelligence instrument is then considered normal phenomenon, without producing any protection act.So when two dry springs Any one in pipe goes wrong, and may result in the unmeasurable situation of intelligence instrument；But in this case, Intelligent Instrument Table can not automatic detection tongue tube whether there is problem, so as to result in the mistake of metering or error.

Utility model content

One of the purpose of this utility model is to provide a kind of tongue tube detection electricity that can voluntarily detect tongue tube quality Road.

The two of the purpose of this utility model are to provide a kind of measuring instrument for including tongue tube detection circuit.

This tongue tube detection circuit provided by the utility model, including controller and electromagnet；Electromagnet is arranged in dry The bottom of reed pipe, and the I/O pins of the energization end of electromagnet and controller circuitry connect；Controller circuitry is used to detect dry spring Sent during the working condition of pipe control signal cause on electromagnet it is electric so that electricity and reading corresponding tongue tube on electromagnet Working signal, so as to judge the quality of tongue tube.

Described tongue tube detection circuit also includes protection circuit；The protection circuit is connected to controller and electromagnet Between energization end, for protecting the I/O pins of controller.

Described protection circuit includes current-limiting resistance and fly-wheel diode；Current-limiting resistance is serially connected in the energization end of electromagnet, For limiting the operating current of electromagnet；Fly-wheel diode is attempted by between the energization end of electromagnet, in electromagnet power down When for the induced-current that is generated on electromagnet provide continuous current circuit, so as to protect the I/O pins of controller.

Described controller is PLC, single-chip microcomputer or DSP.

The utility model additionally provides a kind of measuring instrument for including tongue tube detection circuit.

This tongue tube detection circuit provided by the utility model, control the break-make of electromagnet and effectively by controller and The break-make of autotelic control tongue tube, so as to realize the detection of tongue tube, therefore the utility model can realize that tongue tube is good Bad automatic detection；Used time, include the measuring instrument of the utility model circuit, due to realizing the automatic detection of tongue tube, from And it ensure that the metering reliability and accuracy of measuring instrument.

Brief description of the drawings

Fig. 1 is functional block diagram of the present utility model.

Fig. 2 is the circuit theory diagrams of controller part of the present utility model.

Fig. 3 is the circuit theory diagrams of solenoid part of the present utility model.

Embodiment

It is functional block diagram of the present utility model as shown in Figure 1：This tongue tube detection circuit provided by the utility model, Including controller, electromagnet and protection circuit；Electromagnet is arranged in the bottom of tongue tube, and the energization end of electromagnet passes through protection The I/O pins of circuit and controller circuitry connect；Controller circuitry is used to send control when detecting the working condition of tongue tube Signal cause on electromagnet it is electric so that electricity and the working signal of corresponding tongue tube is read on electromagnet, so as to judge to do The quality of reed pipe；The protection circuit is connected between controller and the energization end of electromagnet, for protecting the I/O of controller to draw Pin.

It is illustrated in figure 2 the circuit theory diagrams of controller part of the present utility model：In controller circuitry, controller chip Using model MSP430F6736 control chip, single-chip microcomputer, PLC or DSP with similar functions etc. equally can be also used Controller or control chip；The 21 of control chip connect corresponding crystal oscillating circuit with 22 pin and provide crystal oscillator for control chip；Control 24 and 25 pin of device for multiplexing signal pins, 33 pin of controller for the energization end of connection electromagnet common port pin, 34 Draw to connect the control terminal pin at the energization end of first via electromagnet, 35 for the control terminal at the energization end of the second road electromagnet of connection Pin, the 36 of chip and 37 are similarly the signal pins of multiplexing.

It is illustrated in figure 3 the circuit theory diagrams of solenoid part of the present utility model：K1 and K2 in figure are the first dry spring Pipe and the second tongue tube, resistance R20 and R21 are the first pull-up resistor and the second pull-up resistor, and resistance R25 and C31 form first Filter circuit, resistance R26 and electric capacity C32 form the second filter circuit；Signal EN_K1 and EN_K2 connect the 36 of controller respectively With 37 pin, signal Measure-Pluse2_RXD and Measure-Pluse1_TXD connect 24 and 25 pin of controller respectively；Letter Number E be the first electromagnet YA1 energization end common port and the second electromagnet YA2 energization end common port, signal A is first The control terminal at the energization end of electromagnet, signal B are the control terminal at the energization end of the second electromagnet.

Below in conjunction with Fig. 2 and Fig. 3 circuit theory diagrams, illustrate the course of work of the utility model circuit：

Circuit described in Fig. 3 is multiplex circuit, can be used as metering signal detection circuit, can also be as the detection of tongue tube Circuit；

When detecting circuit as metering signal, now EN-K1 and EN-K2 is output signal, Measure-Pulse1_ TXD and Measure-Pulse2_RXD is input signal：Now, medium promotes wheel rotation, while has driven coaxial pointer Rotate, two permanent magnets, such every revolution, the adhesive meeting successively in the presence of permanent magnet of two tongue tubes are inlaid with pointer Low and high level change is produced, in the normal function of measuring stage, EN-K1 and EN-K2 are output signal, Measure-Pulse1_TXD It is input signal with Measure-Pulse2_RXD；EN-K1 and EN-K2 is as metering enable signal, by controller every some Second (such as 1S) sends a high level, through pull-up resistor R20 and R21, enters control after filter circuit R25, R26, C31 and C32 The I/O mouths of device processed, controller is by inquiring about the level states of I/O mouths, as Measure-Pulse1_TXD and Measure- The metering that can just produce 0.1 unit when Pulse2_RXD is sequentially generated low level adds up；And in this stage, electromagnet is not work 's.

When the detection circuit as tongue tube, now EN-K1 and EN-K2 is input signal, Measure-Pulse1_ TXD and Measure-Pulse2_RXD is output signal；When two tongue tubes all disconnect or one disconnects an adhesive, Need to be detected：

If two tongue tubes disconnect：Now EN-K1 and EN-K2 is as input signal, Measure-Pulse1_TXD and Measure-Pulse2_RXD is as output signal, and controller is by Measure-Pulse1_TXD and Measure-Pulse2_RXD Signal is set to high level, while detects EN-K1 and EN-K2 level state, if being all high level, then it is assumed that two tongue tubes All it is off-state, now to electromagnet charging, (i.e. signal E is exported low level by controller, and signal A and B output are high electricity It is flat), now electromagnet will produce magnetic field after being powered, two tongue tubes K1 and K2 under the influence of a magnetic field can adhesive, controller EN-K1 and EN-K2 level state are detected again, if EN-K1 and EN-K2 level states detect high level, then it is assumed that corresponding Tongue tube dysfunction, otherwise it is assumed that corresponding tongue tube is normal.So far, this detection journey terminates.

If two tongue tubes, one disconnection, one adhesive：Now Measure-Pulse1_TXD and Measure-Pulse2_ RXD is set to high level by controller, and controller detects EN-K1 and EN-K2 level state, if one is high level, one For low level, then it is assumed that a tongue tube is off-state and another is attracting state, is now only needed to off-state Electromagnet charging (i.e. signal E is exported low level by controller, while is high level by signal A or B output) under tongue tube, this Shi Tong electricity electromagnet will produce magnetic field, tongue tube K1 or K2 under the influence of a magnetic field can adhesive, controller detection EN-K1 or EN-K2 level state, if EN-K1 or EN-K2 level states are detected as low level, then it is assumed that the tongue tube function of detection is just Often, otherwise it is assumed that tongue tube dysfunction.And when thinking that tongue tube function is normal, it is necessary to continue to carry out another tongue tube Self-test：Now controller can mark normal tongue tube automatically, and when it low level state twice in succession occurs, controller can core Whether the testing medium of corresponding measurement being increased, if adding 0.1 unit, then it is assumed that another tongue tube function is also normal, Otherwise it will be considered that another tongue tube dysfunction.So far, this process of self-test terminates.

And when two tongue tubes are all damaged in attracting state, intelligence instrument is considered magnetic disturbance, can be by the valve of intelligence instrument Door is closed, and is not in non-metering problem；

In addition, once the tongue tube self-test stage finds have tongue tube exception occur, then start and close valve protection program, carry simultaneously Show that tongue tube error information is warned.

Claims (5)

1. a kind of tongue tube detects circuit, it is characterised in that including controller and electromagnet；Electromagnet is arranged under tongue tube Portion, and the I/O pins of the energization end of electromagnet and controller circuitry connect；Controller circuitry is used for the work in detection tongue tube Control signal is sent during state and causes electricity on electromagnet, so that work letter that is electric and reading corresponding tongue tube on electromagnet Number, so as to judge the quality of tongue tube.

2. tongue tube according to claim 1 detects circuit, it is characterised in that also including protection circuit；The protection circuit It is connected between controller and the energization end of electromagnet, for protecting the I/O pins of controller.

3. tongue tube according to claim 2 detects circuit, it is characterised in that described protection circuit includes current-limiting resistance And fly-wheel diode；Current-limiting resistance is serially connected in the energization end of electromagnet, for limiting the operating current of electromagnet；Fly-wheel diode It is attempted by between the energization end of electromagnet, providing afterflow for the induced-current in electromagnet power down to be generated on electromagnet returns Road, so as to protect the I/O pins of controller.

4. the tongue tube detection circuit according to one of claims 1 to 3, it is characterised in that described controller is PLC, list Piece machine or DSP.

5. a kind of measuring instrument, it is characterised in that detect circuit including the tongue tube described in one of Claims 1 to 4.