CN202837498U - Coal mining feed switch detecting device - Google Patents

Abstract

The utility model relates to the technical field of coal mining equipment, provides a coal mining feed switch detecting device, and aims to solve the problem that an existing feed switch is weak in processing capacity and low in automation degree and the like. The coal mining feed switch detecting device comprises a measuring and controlling module, a managing module and double-port RAM (random-access memory). The measuring and controlling module comprises a mutual inductor unit, a preprocessing circuit unit, an A/D (analog/digital) converter, a DSP (digital signal processor), a switching input unit, a switching output unit and optoelectronic isolation modules, wherein the mutual inductor unit, the preprocessing circuit unit, the A/D converter and the DSP are sequentially connected, and the switching input unit and the switching output unit are connected with the DSP via the optoelectronic isolation modules. The managing module comprises a DSP, a displayer, a keyboard and an RS (radio station)-485 communication interface, wherein the displayer, the keyboard and the RS-485 communication interface are connected with the DSP. The coal mining feed switch detecting device is applied to a coal mining feed switch.

Description

Colliery feeding switch pick-up unit

Technical field

The utility model relates to the coal mine equipment technical field, and a kind of colliery feeding switch pick-up unit is provided.

Background technology

Mining feed switch is applicable to contain in the mine of the explosive hazard environments such as gas or coal dust, opens as distribution

Closing and use, is the key equipment of distribution system under the coal mine, and its performance quality directly affects product safety and the production efficiency under the coal mine.And the present most of mine feeding switch of China remains early stage non intelligentization product; using air type feeding switch intelligent protection system in the low-voltage power supply system; only has electromagnetic type snap action overcurrent relay; can't be to the overload of load, disconnected protect mutually; the unsymmetrical short-circuit protection domain is little, and sensitivity is low.And be embodied in the following aspects:

1. security, reliability can not meet the demands.Traditional exploiting field, down-hole transformer station great majority adopt relay protection and aut.eq., the telemechanical apparatus etc. in conventional equipment, the especially secondary device to adopt electromagnetic type or transistor type, complex structure, and reliability is not high, and itself does not have again the ability of fault self-diagnosis.

2. be not suitable with the requirement that the colliery electric system is calculated and controlled in real time fast.Traditional down-hole transformer station or feeding switch, the operating condition of primary system, because motor function is incomplete, some remote measurements, remote signalling can't be delivered to the dispatching center in real time; And parameter acquisition is uneven, and is inaccurate.Down-hole transformer station itself lacks again automatic control and remote control means, therefore can't control in real time, is unfavorable for the safe and stable operation of colliery electric system.

3. workload is large, and equipment dependability is poor, is unfavorable for improving operation and management level and automatization level.Conventional protective device and aut.eq. are subject to the operating ambient temperature impact, the regularly power failure verification of its setting valve, and workload is large, also can't realize the definite value of distant place modification protection or aut.eq..

4. although part feeding switch electric parameter detection calculations has adopted microprocessor such as 51 series and 96 series.But along with electric system to real-time, the improving constantly of data volume and calculation requirement, these devices can not adapt to the requirement of electric system well aspect computing power.Storage space is little, and arithmetic speed is slow, is difficult to finish in the short time a large amount of data processing operations, can not satisfy the requirement of electric system high real-time.Cause Real Time Monitoring and advanced algorithm to be restricted.

Summary of the invention

The purpose of this utility model is to provide a kind of automaticity high, a kind of colliery feeding switch pick-up unit that processing speed is fast.

The utility model is to achieve these goals by the following technical solutions:

A kind of colliery feeding switch pick-up unit is characterized in that: comprise control module and administration module, dual port RAM, described control module are connected the dual port RAM connection and carry out data interaction with administration module;

Described control module comprises mutual inductor unit, pre-process circuit unit, A/D converter, the dsp processor that is linked in sequence, also comprise the switching value input block, switch amount output unit and photoelectric isolation module, described switching value input block is connected by photoelectric isolation module with dsp processor with switch amount output unit;

Described administration module comprises dsp processor, the display that all is connected with dsp processor, keyboard, RS-485 communication interface.

In the such scheme, described mutual inductor unit comprises HDC-20LB type Hall current sensor and HNV400T type Hall voltage sensor.

In the such scheme, described A/D converter adopts the MAXl25 model.

In the such scheme, also comprise phase-locked loop circuit, described phase-locked loop circuit is connected with pre-process circuit unit, A/D converter, dsp processor.

The utlity model has following beneficial effect:

One, feeder equipment adopts DSP (TMS320LF2407) specially to the real-time processing of electrical network electric parameter, and the data-handling capacity of device is strengthened greatly.The all-wave Fourier algorithm has very strong filter capacity, is applicable to first-harmonic or the collection of various higher hamonic wave periodic quantity.Half-wave Fourier algorithm can use when low voltage electric network is short-circuited situation, guarantees the real-time of feed protection.

Two, adopt dual port RAM that two DSP are carried out digital communication, utilize shared storer, allow simultaneously reference-to storage of many CPU, greatly improved communication efficiency, and CPu there is not too much requirement, be particularly suitable for the asynchronous high-speed system between the xenogenesis CPU, simplified circuit, be beneficial to software implemented.

Description of drawings

Fig. 1 is the utility model system block diagram.

Embodiment

The below is described further the utility model:

The utility model provides colliery feeding switch pick-up unit, comprises control module and administration module, and dual port RAM, described control module are connected the dual port RAM connection and carry out data interaction with administration module;

Described control module comprises mutual inductor unit, pre-process circuit unit, A/D converter, the dsp processor that is linked in sequence, also comprise the switching value input block, switch amount output unit and photoelectric isolation module, described switching value input block is connected by photoelectric isolation module with dsp processor with switch amount output unit;

Described administration module comprises dsp processor, the display that all is connected with dsp processor, keyboard, RS-485 communication interface.

Mutual inductor unit: comprise that its model adopts HDC-20LB type Hall current sensor and HNV400T type Hall voltage sensor for the current transformer of the voltage transformer (VT) that gathers voltage signal and collection current signal.

The pre-process circuit unit: major function has, and the one, with taking from electric current, the voltage signal process proper transformation of electric power mutual-inductor (CT and PT), make it consistent with the input range of analog to digital converter; The 2nd, isolate with external electrical equipment, improve the antijamming capability of system.Signal conversion and low-pass filtering treatment, be respectively 110V, 1A from voltage of power mutual inductor summation current transformer secondary side voltage, current signal out, its amplitude is considerably beyond the permissible value of electronic devices and components, therefore the output signal of voltage of power mutual inductor summation current transformer is carried out transformation of scale by sensor, amplify again and isolate, guarantee that the data volume that gathers is accurate, reliable.

Switching value input, output: this device has ten switch input quantities, eight switch output quantities.The switch input quantity is mainly finished the fault alarm function that monitors various on off states (such as the position of isolating switch, earthing position, closing by hand, manual brake separating etc.), protection action feelings and device.The action of 8 relays of eight switching value output control is comprising a closing relay, a separating brake relay, four signal relays and two locking relays.Switching value is digital signal, and dsp processor is by the I/O input and output.

Dsp chip TMS320F2407, for being the little current signal of low pressure of 3.3V, institute's control object feeding switch is the forceful electric power device, there is very big-difference in both in the requirement of level range and driving force.Therefore the main task of output channel is that small-signal is converted to powerful output signal, satisfies to drive requirement.In addition, in order to prevent isolating switch to the feedback interference of microsystem, exit passageway also will be isolated.The way that this device adopts photoelectrical coupler and relay to combine realizes the isolation between microsystem and the isolating switch.

D/A converting circuit: A/D conversion is the indispensable important step in the control system, and its conversion accuracy has determined the quality of whole control system performance.Although built-in 10 the high-speed a/d modules of TMS320LF2407 DSP, there is following shortcoming in this module, can only receive the unipolar signal input of O～3.3V.Need to design in addition amplitude limit for AC signal and lift volt circuit; Each channels crosstalk is serious in the same sorting unit; 10 conversion accuracy is difficult to satisfy the requirement of high performance system.This problem selects 14 high-speed a/d core MAXl25 of Maxim company as outside analog to digital converter.

Dsp processor adopts dsp chip TMS320F2407.

Keyboard and liquid crystal display

Keyboard circuit is realized following functions:

A. the setting of each switching value virgin state;

B. the setting in each analog quantity limit value and dead band;

C. the modification of relay protection and aut.eq. setting valve table:

D. the modification of picture;

E. the modification of various forms;

F. the calling of various forms, picture, parameter accesses demonstration;

Affirmation and the releasing of h. reporting to the police.

Liquid crystal display: for measurement parameter shows, comprise the measurement parameter of electrical network normal condition and the measurement parameter of malfunction.When normal condition, the analog quantity of demonstration has the position signalling of three-phase current, voltage and meritorious and reactive power, the relevant contact of isolating switch and malfunction demonstration etc.

On communication mode, because it is few that RS-485 communication connects 121 long transmission distance, line, adopt differential signal to transmit, maximum transmission distance can reach 1.2km, can connect 32 drivers and transceiver take MAX485 as the converter maximum, the receiver minimum sensitivity can reach 4-200 mV, and peak transfer rate can reach 2.5Mb/s.According to the characteristics of coal production, all adopt RS-485 bus mode with DSP with communicating by letter of PC point-to-points.

Claims (4)

1. colliery feeding switch pick-up unit is characterized in that: comprise control module and administration module, dual port RAM, described control module are connected dual port RAM and connect and carry out data interaction with administration module;

Described control module comprises mutual inductor unit, pre-process circuit unit, A/D converter, the dsp processor that is linked in sequence, also comprise the switching value input block, switch amount output unit and photoelectric isolation module, described switching value input block is connected by photoelectric isolation module with dsp processor with switch amount output unit;

Described administration module comprises dsp processor, the display that all is connected with dsp processor, keyboard, RS-485 communication interface.

2. colliery according to claim 1 feeding switch pick-up unit, it is characterized in that: described mutual inductor unit comprises HDC-20LB type Hall current sensor and HNV400T type Hall voltage sensor.

3. colliery according to claim 1 feeding switch pick-up unit is characterized in that: described A/D converter employing MAXl25 model.

4. colliery according to claim 1 feeding switch pick-up unit, it is characterized in that: also comprise phase-locked loop circuit, described phase-locked loop circuit is connected with pre-process circuit unit, A/D converter, dsp processor.

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