CN201708523U - Electronically-controlled protection device - Google Patents
Electronically-controlled protection device Download PDFInfo
- Publication number
- CN201708523U CN201708523U CN2010202529163U CN201020252916U CN201708523U CN 201708523 U CN201708523 U CN 201708523U CN 2010202529163 U CN2010202529163 U CN 2010202529163U CN 201020252916 U CN201020252916 U CN 201020252916U CN 201708523 U CN201708523 U CN 201708523U
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- motor
- power
- relay
- unit
- protection unit
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- Protection Of Static Devices (AREA)
- Protection Of Generators And Motors (AREA)
Abstract
The utility model discloses an electronically-controlled protection device, which comprises an overload power-off protection unit and an over-temperature power-off protection unit that are electrically connected and are also connected with an external motor, wherein the overload power-off protection unit comprises a voltage comparing unit and a power-off action unit; the power-off action unit comprises a first relay, of which the normally-closed point is connected in series in a pilot loop of the external motor and is switched off when the current value exceeds the rated current of the motor; and the over-temperature power-off protection unit comprises a second relay, of which the normally-closed point is connected in series in the pilot loop of the external motor and is switched off when the temperature of the motor becomes abnormal. By virtue of the action of the two relays, the loop can be cut off fast, thereby ensuring both the safety and stability of the system; moreover, the utility model can not only save wiring and devices, but also avoid error actions, thereby enhancing the stability of the system, and greatly facilitating the maintenance and reducing the cost.
Description
Technical field
The utility model relates to the electric current of a kind of cutting motor that is used to detect coal-winning machine and pump motor and realizes the device of overload protection power down function, and what be specifically related to is a kind of automatically controlled protective device.
Background technology
In the prior art, the cutting motor of coal-winning machine and the overload protection of pump motor are to give PLC analog quantity input signal by current transformer, realize according to the PLC program setting, thereby play the function in the whole loop of protection control.Yet prior art needs very complicated wiring and a large amount of device to realize, and; the possibility that misoperation appears in system is also very big, and the poor stability of system overhauls also very inconvenient; in addition, cost is higher also is one of shortcoming of the automatically controlled protection system of prior art.
The utility model content
The purpose of this utility model provides a kind of automatically controlled protective device, provides protection to greatest extent by its overload power-off protection unit that carries and excess temperature power-off protection unit to system.
To achieve these goals, the utility model provides a kind of automatically controlled protective device, is characterized in, comprises the overload power-off protection unit and the excess temperature power-off protection unit that connect and be connected with exterior motor by circuit;
Above-mentioned overload power-off protection unit comprises voltage comparison unit and the outage motor unit that connects by circuit;
Described outage motor unit comprises first relay; The normally closed point of described first relay is connected in the guide loop of its exterior motor, and it disconnects when current value surpasses the motor rated current;
Described excess temperature power-off protection unit comprises second relay; The normally closed point of described second relay is connected in the guide loop of its exterior motor, and it disconnects when the temperature anomaly of motor.
Above-mentioned automatically controlled protective device, wherein, voltage comparison unit comprises slide rheostat and some pressurizers; Described some pressurizers offer operational amplifier with voltage, obtain the reference voltage of operational amplifier by slide rheostat, realize the comparison of voltage.
Above-mentioned automatically controlled protective device, wherein, the outage motor unit also comprises operational amplifier and the transistor that inserts by circuit;
Described operational amplifier when system power overloads with its in the same way the voltage of input and reverse input end compare, its output level is a high level;
Conducting when the base stage input current potential of described transistor is high potential;
During described transistor conducting, the normally closed point of first relay disconnects.
Above-mentioned automatically controlled protective device, wherein, excess temperature power-off protection unit is connected with the temperature protection point of exterior motor, and when temperature anomaly, the temperature protection point of exterior motor disconnects, and normally closed some dead electricity of second relay disconnected.
Above-mentioned automatically controlled protective device, it also comprises the alarm module by the circuit access device, and whether it overloads according to whole system is sent alarm signal.
The utility model compared with prior art, its advantage is: because the utility model carries three-dimensional pressurizer and rectifier, so can produce 12 volts of stable direct voltages, make the more accurate of voltage, protect more reliable; The utility model itself is outer to have indicator light, can show fault; The utility model passes through relay J 1, the action of J2, and cut-off loop guarantees the fail safe and stability of system rapidly; The utility model both can have been saved wiring and device, can prevent misoperation again, had strengthened the stability of system, also for maintenance brings great convenience, greatly reduced cost simultaneously again.
Description of drawings
Fig. 1 is the structured flowchart of the automatically controlled protective device that provides of the utility model;
Fig. 2 is the circuit diagram of the automatically controlled protective device that provides of the utility model.
Embodiment
Below in conjunction with Fig. 1 and Fig. 2, describe the utility model preferred embodiment in detail.
As depicted in figs. 1 and 2, a kind of automatically controlled protective device is characterized in that, comprises the overload power-off protection unit 1, excess temperature power-off protection unit 2 and the alarm module that connect and be connected with exterior motor by circuit.Overload power-off protection unit 1 comprises voltage comparison unit 11 and outage motor unit 12.
Operational amplifier (LM358) and transistor (V3) that outage motor unit 12 comprises first relay (J2), inserts by circuit.System major loop in the utility model place has 3 motor, and 3 motor are equipped with the automatically controlled protective device that the utility model provides.The detected current value of arbitrary current transformer in the utility model external circuit, above 150% o'clock of the motor rated current, the utility model was carried out overload protection.With arbitrary cutting motor is example, just when detecting electric current above 165A, export the direct voltage of 4.13V at the secondary side of current transformer, the in-phase input end of operational amplifier (LM358) and the voltage of inverting input are compared, the operational amplifier output level is a high level, then the transistor V3 in the circuit is because its base stage input current potential is high level and conducting, the normally closed point of the relay in the circuit (J2) disconnects, because this node strings is associated in the guide loop of its exterior motor, so disconnected the guide loop of whole coal-winning machine system, realized the overload power down function of coal-winning machine, wherein, the guide loop of coal-winning machine refers to: the circuit loop of conducting at first during the coal-winning machine starting up.
Excess temperature power-off protection unit 2 comprises second relay (J1); be connected with the temperature protection point of outside two cutting motors and pump motor between the CH2-6 of excess temperature power-off protection unit 2 and the CH2-7; when in case wherein arbitrary motor temperature is too high; motor self temperature protection point disconnect; cause relay (J1) dead electricity, its normally closed point disconnects, because this node strings is associated in the guide loop; so also play the guide loop of resolving the mine coal machine, realized the excess temperature power down function of coal-winning machine.Excess temperature power-off protection unit 2 also comprises bridge rectifier, and bridge rectifier cooperates pressurizer (7812,7824) can produce 12 volts of stable direct voltages, makes the more accurate of voltage, protects more reliable.
Can send alarm signal when the excessive or temperature of its electric current at the motor of system of alarm module (not shown) is too high, the attendant is to its place under repair in prompting, saves time, and increases work efficiency.
The utility model has the advantages that: the utility model carries three-dimensional pressurizer and rectifier, so can produce 12 volts of stable direct voltages, makes the more accurate of voltage, protects more reliable; The utility model itself is outer to have indicator light, can show fault; The utility model passes through relay J 1, the action of J2, and cut-off loop guarantees the fail safe and stability of system rapidly; The utility model both can have been saved wiring and device, can prevent misoperation again, had strengthened the stability of system, also for maintenance brings great convenience, greatly reduced cost simultaneously again.
Although content of the present utility model has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to restriction of the present utility model.After those skilled in the art have read foregoing, for multiple modification of the present utility model with to substitute all will be conspicuous.Therefore, protection range of the present utility model should be limited to the appended claims.
Claims (5)
1. an automatically controlled protective device is characterized in that, comprises the overload power-off protection unit (1) and the excess temperature power-off protection unit (2) that connect and be connected with exterior motor by circuit;
Described overload power-off protection unit (1) comprises voltage comparison unit (11) and the outage motor unit (12) that connects by circuit;
Described outage motor unit (12) comprises first relay; The normally closed point of described first relay is connected in the guide loop of its exterior motor, and it disconnects when current value surpasses the motor rated current;
Described excess temperature power-off protection unit (2) comprises second relay; The normally closed point of described second relay is connected in the guide loop of its exterior motor, and it disconnects when the temperature anomaly of motor.
2. automatically controlled protective device as claimed in claim 1 is characterized in that, described voltage comparison unit (11) comprises slide rheostat and some pressurizers; Described some pressurizers offer operational amplifier with voltage, obtain the reference voltage of operational amplifier by slide rheostat, realize the comparison of voltage.
3. automatically controlled protective device as claimed in claim 2 is characterized in that, described outage motor unit (12) also comprises operational amplifier and the transistor that inserts by circuit;
Described operational amplifier when system power overloads with its in the same way the voltage of input and reverse input end compare, its output level is a high level;
Conducting when the base stage input current potential of described transistor is high potential;
During described transistor conducting, the normally closed point of first relay disconnects.
4. automatically controlled protective device as claimed in claim 3; it is characterized in that described excess temperature power-off protection unit (2) is connected with the temperature protection point of exterior motor, when temperature anomaly; the temperature protection point of exterior motor disconnects, and normally closed some dead electricity of second relay disconnected.
5. automatically controlled protective device as claimed in claim 4 is characterized in that, also comprises the alarm module by the circuit access device, and whether it overloads according to whole system is sent alarm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202529163U CN201708523U (en) | 2010-07-06 | 2010-07-06 | Electronically-controlled protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202529163U CN201708523U (en) | 2010-07-06 | 2010-07-06 | Electronically-controlled protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201708523U true CN201708523U (en) | 2011-01-12 |
Family
ID=43445674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202529163U Expired - Lifetime CN201708523U (en) | 2010-07-06 | 2010-07-06 | Electronically-controlled protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201708523U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102411322A (en) * | 2011-11-10 | 2012-04-11 | 许继集团有限公司 | Single chip microcomputer maloperation prevention driving method and circuit thereof |
-
2010
- 2010-07-06 CN CN2010202529163U patent/CN201708523U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102411322A (en) * | 2011-11-10 | 2012-04-11 | 许继集团有限公司 | Single chip microcomputer maloperation prevention driving method and circuit thereof |
| CN102411322B (en) * | 2011-11-10 | 2014-04-30 | 许继集团有限公司 | Single chip microcomputer maloperation prevention driving method and circuit thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHANGHAI CHUANGLI GROUP CO., LTD. Free format text: FORMER NAME: SHANGHAI CHUANGLI MINING EQUIPMENT CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: Qingpu Industrial Park Qingpu District Shanghai city 201706 song Fu Road No. 1568 Patentee after: Shanghai Chuangli Group Co., Ltd. Address before: Qingpu Industrial Park Qingpu District Shanghai city 201706 song Fu Road No. 1568 Patentee before: Shanghai Chuangli Mining Equipment Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110112 |