CN204256071U - A kind of safety detection circuit of mining switching machine control knob - Google Patents
A kind of safety detection circuit of mining switching machine control knob Download PDFInfo
- Publication number
- CN204256071U CN204256071U CN201420742197.1U CN201420742197U CN204256071U CN 204256071 U CN204256071 U CN 204256071U CN 201420742197 U CN201420742197 U CN 201420742197U CN 204256071 U CN204256071 U CN 204256071U
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Abstract
The utility model relates to a kind of safety detection circuit of mining railway switch control button.Safety detection circuit comprises microprocessor, frequency signal detection circuit, level signal testing circuit and mining button.Frequency signal detection circuit, its input/output terminal is connected alternately with the input/output terminal of microprocessor, and its input/output terminal is connected with mining button by mine cable.Level signal testing circuit, its input/output terminal is connected with mining button by mine cable, and its output terminal is connected with the input end of microprocessor.From above technical scheme, the utility model adopts frequency signal detection circuit and level signal testing circuit to carry out dual safety detection to mining button, effectively can solve the error detection because mining button shake, contact adhesion etc. bring, compared with safety detection low circuit cost achieving mining switching machine control knob.
Description
Technical field
The utility model relates to mining equipment field control field, is specifically related to a kind of safety detection circuit of mining switching machine control knob.
Background technology
On-the-spot in mine, mining goat, as a kind of equipment pulling track switch, plays very important effect in the transportation such as material, personnel.Usually, mining goat can access transport monitor system, and system can need to control mining goat and automatically carries out pulling track switch according to current.But, when non-usage monitoring system or supervisory system occur abnormal, need scene to operate mining goat.
Now, mining switching machine control knob, is called for short mining button, as very important that a kind of simple and effective control mode shows.At present, conventional mining railway switch control button working method is: when external force makes mining push-button contact close, the loop conducting of mining button, once detect that namely the loop conducting of mining button thinks that this mining button is effective; Distant between mining button and mining goat, or when mining button soaks, contact resistance is less, be easy to occur error detection, the method of normal employing is the voltage or the current value that increase mining button loop, this mode not only increases equipment power dissipation, at special dimensions such as collieries, the raising that the flame proof and intrinsic safety that bring equipment require by the increase of this power consumption, adds equipment cost.
Utility model content
The purpose of this utility model is the safety detection circuit providing a kind of mining railway switch control button, this safety detection circuit can make up the deficiencies in the prior art, and when low-voltage, consumption small electric stream, reliable safety detection can be carried out to mining button.
For achieving the above object, the utility model have employed following technical scheme:
A safety detection circuit for mining railway switch control button, comprises microprocessor, frequency signal detection circuit, level signal testing circuit and mining button.
Described frequency signal detection circuit, its input/output terminal is connected alternately with the input/output terminal of microprocessor, and its input/output terminal is connected with mining button by mine cable.
Described level signal testing circuit, its input/output terminal is connected with mining button by mine cable, and its output terminal is connected with the input end of microprocessor.
Further, described frequency signal detection circuit comprises output isolation circuit, loop control circuit, comparator circuit, dividing potential drop current-limiting circuit and input isolation circuit.
Described output isolation circuit, the output terminal of its input termination microprocessor, its output terminal connects the first input end of loop control circuit.
Described dividing potential drop current-limiting circuit, its input/output terminal is connected with mining button interaction, and its output terminal is connected with the input end of comparator circuit.
Described comparator circuit, its output terminal connects the second input end of loop control circuit.
Described loop control circuit, it exports the input end of termination input isolation circuit.
Described input isolation circuit, it exports the input end of termination microprocessor.
Further, described level signal testing circuit comprises relay buffer circuit, described relay buffer circuit, and its input/output terminal is connected with mining button interaction, and its output terminal is connected with the input end of microprocessor.Relay has the features such as On current is large, strong interference immunity, and two alignment detection circuits cooperatively interact, and reach the object of safety detection.
Further, described mining button is contact open type nonstick button.
From above technical scheme, the utility model adopts frequency signal detection circuit and level signal testing circuit to carry out dual safety detection to mining button, effectively can solve the error detection because mining button shake, contact adhesion etc. bring, compared with safety detection low circuit cost achieving mining switching machine control knob.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model;
Fig. 2 is the theory diagram of frequency signal detection circuit;
Fig. 3 is the theory diagram of level signal testing circuit;
Fig. 4 is the circuit theory diagrams of dividing potential drop current-limiting circuit.
Wherein:
1, microprocessor, 2, frequency signal detection circuit, 3, level signal testing circuit, 4, mining button, 21, output isolation circuit, 22, loop control circuit, 23, comparator circuit, 24, dividing potential drop current-limiting circuit, 25, input isolation circuit.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further:
As shown in Figure 1, a kind of safety detection circuit of mining railway switch control button, comprises microprocessor 1, frequency signal detection circuit 2, level signal testing circuit 3 and mining button 4.Under normal circumstances, mining button is for manually operating.Described frequency signal detection circuit 2, its input/output terminal is connected alternately with the input/output terminal of microprocessor 1, and its input/output terminal is connected with mining button 4 by mine cable.Described level signal testing circuit 3, its input/output terminal is connected with mining button 4 by mine cable, and its output terminal is connected with the input end of microprocessor 1.Preferably, described mining button 4 is contact open type nonstick button.The model of described microprocessor 1 is LPC1768 chip, and this chip not only for generation of the frequency quantity signal of 8khz, and carries out back surveying to this frequency quantity signal; Level amount also for exporting level signal testing circuit detects.
As shown in Figure 2, described frequency signal detection circuit 2 comprises output isolation circuit 21, loop control circuit 22, comparator circuit 23, dividing potential drop current-limiting circuit 24 and input isolation circuit 25.Described output isolation circuit 21, the output terminal of its input termination microprocessor 1, its output terminal connects the first input end of loop control circuit 22.Described dividing potential drop current-limiting circuit 24, its input/output terminal is connected alternately with mining button 4, and its output terminal is connected with the input end of comparator circuit 23.Described comparator circuit 23, its output terminal connects the second input end of loop control circuit 22.Described loop control circuit 22, it exports the input end of termination input isolation circuit 25.Described input isolation circuit 25, it exports the input end of termination microprocessor 1.
Specifically, described output isolation circuit 21 all adopts optical coupling isolation circuit with input isolation circuit 25.Described loop control circuit 22 comprises a switch triode.Described switch triode, its base stage connects the output terminal of output isolation circuit 21, and its collector connects the input end of input isolation circuit 25, and its emitter connects the output terminal of comparator circuit 23.Described comparator circuit 23 adopts amplifier circuit.As shown in Figure 4, described dividing potential drop current-limiting circuit 24 comprises resistance R1, resistance R2, diode D and mining button power supply (DC24V), the positive pole of mining button power supply connects the anode of diode D through resistance R1, resistance R2, the negative electrode of diode D connects the power supply signal input end of mining button 4, and the power supply signal of mining button 4 exports the earth terminal of the mining button power supply of termination.From drawing the output terminal of a line as this dividing potential drop current-limiting circuit 24 between resistance R1 and resistance R2, connect the input end of comparator circuit 23.
The principle of work of frequency signal detection circuit is:
Microprocessor 1 exports a frequency quantity signal, after output isolation circuit 21 is isolated, by this frequency quantity Signal transmissions to the base stage of loop control circuit 22 switch triode.Now, when mining button 4 is pressed, dividing potential drop current-limiting circuit 24 can form loop as shown in Figure 4, and the voltage signal that dividing potential drop current-limiting circuit 24 exports to comparator circuit 23 is the magnitude of voltage U1 after resistance R1 and R2 dividing potential drop.When mining button 4 is not pressed, dividing potential drop current-limiting circuit 24 can not form loop as shown in Figure 4, and the voltage signal that dividing potential drop current-limiting circuit 24 exports to comparator circuit 23 is the voltage U 2 of mining button power supply.U1 and U2 is the magnitude of voltage of two different sizes, and it exports to comparator circuit 23, and comparator circuit can export two different control signals to the emitter of loop control circuit 22 switch triode.When for U1, the switch triode conducting of loop control circuit 22, frequency quantity signal is isolated continuing to transfer to input isolation circuit 25, and then exports microprocessor 1 to.When for U2, the switch triode cut-off of loop control circuit 22, frequency quantity signal cannot transmit back microprocessor 1 after transferring to loop control circuit 22 from output isolation circuit 21.Therefore, according to the signal that microprocessor 1 receives from input isolation circuit 25, judge whether mining button normally works.
As shown in Figure 3, described level signal testing circuit 3 comprises relay buffer circuit, described relay buffer circuit, and its input/output terminal is connected alternately with mining button 4, and its output terminal is connected with the input end of microprocessor 1.Relay buffer circuit comprises relay and relay power supply, and relay power supply and microprocessor power supply are mutually isolated.The two ends relay power supply of the coil of relay and mining button composition primary Ioops.The contact of relay, as the output terminal of relay buffer circuit, connects the input end of microprocessor 1.
The principle of work of level signal testing circuit is:
When mining button 4 is pressed, relay coil is energized, and make the closing of contact of relay, the input end of microprocessor 1 receives a level signal U3.When mining button 4 is not pressed, relay coil no power, the contact of relay does not close, and the input end of microprocessor 1 receives a level signal U4.U3 and U4 is two different level signals.
Above-described embodiment is only be described preferred implementation of the present utility model; not scope of the present utility model is limited; under the prerequisite not departing from the utility model design spirit; the various distortion that those of ordinary skill in the art make the technical solution of the utility model and improvement, all should fall in protection domain that the utility model claims determine.
Claims (4)
1. a safety detection circuit for mining railway switch control button, is characterized in that: comprise microprocessor (1), frequency signal detection circuit (2), level signal testing circuit (3) and mining button (4);
Described frequency signal detection circuit (2), its input/output terminal is connected alternately with the input/output terminal of microprocessor (1), and its input/output terminal is connected with mining button (4) by mine cable;
Described level signal testing circuit (3), its input/output terminal is connected with mining button (4) by mine cable, and its output terminal is connected with the input end of microprocessor (1).
2. the safety detection circuit of a kind of mining switching machine control knob according to claim 1, is characterized in that: described frequency signal detection circuit (2) comprises output isolation circuit (21), loop control circuit (22), comparator circuit (23), dividing potential drop current-limiting circuit (24) and input isolation circuit (25);
Described output isolation circuit (21), the output terminal of its input termination microprocessor (1), its output terminal connects the first input end of loop control circuit (22);
Described dividing potential drop current-limiting circuit (24), its input/output terminal is connected alternately with mining button (4), and its output terminal is connected with the input end of comparator circuit (23);
Described comparator circuit (23), its output terminal connects the second input end of loop control circuit (22);
Described loop control circuit (22), it exports the input end of termination input isolation circuit (25);
Described input isolation circuit (25), it exports the input end of termination microprocessor (1).
3. the safety detection circuit of a kind of mining railway switch control button according to claim 1, it is characterized in that: described level signal testing circuit (3) comprises relay buffer circuit, described relay buffer circuit, its input/output terminal is connected alternately with mining button (4), and its output terminal is connected with the input end of microprocessor (1).
4. the safety detection circuit of a kind of mining railway switch control button according to claim 1, is characterized in that: described mining button (4) is contact open type nonstick button.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420742197.1U CN204256071U (en) | 2014-12-02 | 2014-12-02 | A kind of safety detection circuit of mining switching machine control knob |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420742197.1U CN204256071U (en) | 2014-12-02 | 2014-12-02 | A kind of safety detection circuit of mining switching machine control knob |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204256071U true CN204256071U (en) | 2015-04-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420742197.1U Expired - Fee Related CN204256071U (en) | 2014-12-02 | 2014-12-02 | A kind of safety detection circuit of mining switching machine control knob |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204256071U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407252B (en) * | 2014-12-02 | 2017-10-13 | 合肥工大高科信息科技股份有限公司 | The safety detection circuit and its detection method of a kind of mining switching machine control button |
-
2014
- 2014-12-02 CN CN201420742197.1U patent/CN204256071U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407252B (en) * | 2014-12-02 | 2017-10-13 | 合肥工大高科信息科技股份有限公司 | The safety detection circuit and its detection method of a kind of mining switching machine control button |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150408 Termination date: 20181202 |