CN2874659Y

CN2874659Y - Coal flow monitor

Info

Publication number: CN2874659Y
Application number: CN 200620089909
Authority: CN
Inventors: 杨声
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-03-20
Filing date: 2006-03-20
Publication date: 2007-02-28
Anticipated expiration: 2016-03-20

Abstract

The utility model relates to a monitor, in particular to a coal flow monitor, which comprises a detector and a control box. Wherein, the detector has applied acoustoelectric detecting principle and adopted a piezo-ceramic sheet as detecting element and detected frequency signals arising from friction through a band-pass filtering. The utility model can be widely applied to the coal feeder and measure the coal flow in the closed pipes or chutes.

Description

Coal flow monito

Technical field

The utility model relates to a kind of monitor, particularly relates to a kind of coal flow monito.

Background technology

Also do not have at home at present a kind of can be to the instrument of coal mobile monitoring in the feeder closed container, normally whether feeder previous stage belt conveyor operation, whether have coal to carry and come, be very important concerning feeder.Usually place a monitor abroad in feeder, both coal flow monito was monitored the state in the feeder, and the coal flow monito of our development is exactly a performance of using for reference external product, adopted acoustic-electric technology for detection principle design to come out.Have the characteristics identical with the external product performance.And external product price is more expensive relatively, debugs very inconveniently again, causes not fleabite to enterprise, causes a large amount of wastes also for country and business capital.

Summary of the invention

The purpose of this utility model is to provide a kind of coal flow monito, and this coal flow monito has been used acoustic-electric and detected principle, and piezoelectric ceramic piece produces frequency signal to friction by bandpass filtering and detects as detecting element.

The purpose of this utility model is achieved through the following technical solutions:

Coal flow monito is made up of detection bodies and control box, and this control box is provided with the acoustic-electric testing circuit, also is provided with simultaneously to exchange amplification, bandpass filtering, rectification, direct current amplification, comparison, delay circuit; Body and flange welding, piezoelectric ceramics sticks on the stainless steel cone, cone is put into body, gland screws in body, connector and preamplification board bolt connect with electric wire, and preamplification board, sensor connector connect with shielding line, the aviation plug of detection bodies and the connection terminal in the control box connect with shielding line.

Principal feature of the present utility model is:

1, acoustic-electric being detected principle is applied on the coal flow monito.

2, by piezoelectric ceramic piece as detecting element, it is adhered on the stainless steel cone, as the detection bodies (probe) of coal flow monito.

3,,, realize the function of coal flow monito through exchanging technical finesses such as amplification, bandpass filtering, rectification, direct current amplification, comparison, time-delay by the acoustic-electric detection signal.See Fig. 1 schematic diagram block diagram.

4, She Ji bandpass filtering is very important, and the coal friction produces frequency to be passed through at the acoustic signals of 100KHz ± 10%, and other extraneous mechanical noise filters (for example: extraneous hammering pipeline or blanking headwall produce).Bandpass filtering is seen schematic diagram 2 the first five integrated package.

Advantage of the present utility model and effect are:

1, adopts acoustic-electric technology for detection and various technical measures, be not subjected to the influence of exterior mechanical vibration or impact force, can measure flowing of closed conduit or material-falling hopper materials inside effectively.

2, used acoustoelectric sensor is different with capacitive type sensor commonly used.It is highly reliable, is not subjected to medium (material variety, size, humidity etc.) influence.

3, main components and parts adopt import industry and device, and the reliability height adapts to and works under abominable industrial environment.

4, probe and control box all have good sealing property, and probe adopts the RUT sealing, and good water proofing property is arranged, and control box adopts suction casing, and degree of protection is IP65.

Description of drawings

Fig. 1 is a schematic diagram block diagram of the present utility model;

Fig. 2 is a bandpass filtering schematic diagram of the present utility model;

Fig. 3 is sonde configuration figure of the present utility model;

Fig. 4 is a control box front view of the present utility model;

Fig. 5 is a control box side view of the present utility model.

Embodiment

Fig. 3 sonde configuration figure is seen in the probe assembling.

Body 1 and flange 6 welding.Piezoelectric ceramics 5 sticks on stainless steel cone 4.O type ring 3 is enclosed within on the stainless steel cone 4.Cone 4 is put into body 1.Gland 2 screws in body 1, compresses fixedly stainless steel cone 4 of O type ring 3.Lid 7 is fastening with flange 6 usefulness M5 bolts 8.Connector 9 is fixing with preamplification board 12 usefulness M3 bolts 10, connects with electric wire.Preamplification board 12, sensor connector 5 usefulness shielding lines connect.

Detection bodies (probe) and control box assembling, the aviation plug 10 of detection bodies (probe) and the connection terminal in the control box connect with RVVP 4 core shielding lines.

The product technology application process

The stainless steel cone 4 of coal flow monito stretches in the closed conduit or material-falling hopper of Flow of Goods and Materials.When its inner Flow of Goods and Materials, the friction between material and the stainless steel cone 4 can be sent sound wave, and the acoustical-electrical transducer that this sound wave will be placed in the detection bodies (probe) converts electric signal to.Electric signal sends control box to after preposition amplification.Filter mechanical noise through interchange amplification, bandpass filtering in control box, effectively represented the signal of Flow of Goods and Materials, after rectification, direct current amplified, one road signal sent LED light beam decibel meter to show again.Another road signal and threshold voltage compare, again through 5 seconds-60 seconds time-delay rear drive relay output alarm signals.Be provided with in order further to prevent mistaking signal from reporting to the police with threshold voltage comparison and these two links of time-delay, threshold voltage, delay time can set up on their own according to actual conditions.

Total 4 in the potentiometer of adjusting on the circuit board is respectively to adjust potentiometer VR-1, gain amplifier adjustment potentiometer VR-2, threshold voltage adjustment potentiometer VR-3, delay time adjustment potentiometer VR-4 zero point.9 TP1 of test point---TP9, passes through tested points can detect the running parameter of circuit at different levels.

Preliminary detection: open the control case lid, connect the cable of control box by terminal figure.The control box energising, power light bright (redness) flows if feeder is the coal that do not have that stops, behind the delay time that sets, alarm lamp bright (yellow), disconnected coal signal is sent in relay adhesive simultaneously.Contact the stainless steel cone 4 that friction is popped one's head in gently with objects such as wooden sticks, produce simulating signal, at this moment alarm lamp goes out, and relay discharges, and illustrates that coal flow monito is working properly.

Adjust zero point: (promptly do not have coal stream flow state) under the out-of-work state of feeder, measure TP7 point voltage or observation LED decibel meter with multimeter, adjust potentiometer VR-1, the voltage that TP7 is ordered is minimum (being similar to zero).Gain amplifier is adjusted: under feeder startup situation, make the coal in the coal pipe begin to flow, (LED decibel meter selector switch pushes the SV position to look into the LED decibel meter with multimeter measurement TP7 point voltage (coal stream signal) or sight, show and detect coal stream signal), adjust potentiometer VR-2, the voltage that TP7 is ordered increases to suitable magnitude of voltage (generally should greater than 2V).Threshold voltage is adjusted: LED decibel meter selector switch is pushed PV (decibel meter demonstration threshold voltage) position, the LED decibel meter will show threshold voltage, measure TP8 point voltage (threshold voltage) or observation LED decibel meter with multimeter, adjust potentiometer VR-3, make threshold voltage be lower than TP7 point voltage (detecting coal stream signal) 0.5V.The adjustment delay time is adjusted: adjust potentiometer VR-4, according to on-the-spot coal situation, be as the criterion not send out the false alarm signal.

Claims

1. coal flow monito is made up of detection bodies and control box, it is characterized in that this control box is provided with the acoustic-electric testing circuit, also is provided with simultaneously to exchange amplification, bandpass filtering, rectification, direct current amplification, comparison, delay circuit; Body (1) and flange (6) welding, piezoelectric ceramics (5) sticks on the stainless steel cone (4), cone (4) is put into body (1), gland (2) screws in body (1), connector (9) is fixing with bolt (10) with preamplification board (12), connects with electric wire, and preamplification board (12), sensor connector (5) connect with shielding line, connection terminal in aviation plug of detection bodies (10) and the control box connects with shielding line.