CN204333926U - A kind of current foldback circuit of D.C. electric drill - Google Patents
A kind of current foldback circuit of D.C. electric drill Download PDFInfo
- Publication number
- CN204333926U CN204333926U CN201420722554.8U CN201420722554U CN204333926U CN 204333926 U CN204333926 U CN 204333926U CN 201420722554 U CN201420722554 U CN 201420722554U CN 204333926 U CN204333926 U CN 204333926U
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- Prior art keywords
- electric drill
- type triode
- resistance
- relay
- connecing
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- 241001074085 Scophthalmus aquosus Species 0.000 abstract description 4
- 230000001681 protective effect Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
Abstract
The current foldback circuit of a kind of D.C. electric drill of the utility model, belongs to the technical field of electric drill current foldback circuit; The technical problem solved is: provide a kind of protective circuit preventing D.C. electric drill overcurrent; The technical scheme adopted is: the protective circuit of D.C. electric drill comprises: electric drill motor M 1, battery U1, thyristor VT1, starting switch K1, change over switch K2, relay ZJ1, its coil is ZJ1.1, and its normally-closed contact is ZJ1.2, when circuit load is excessive, when there is stifled brill phenomenon, the coil ZJ1.1 of relay ZJ1 obtains electric, and the normally-closed contact ZJ1.2 of relay ZJ1 disconnects, and indicator light L1 lights simultaneously, display is shut down, and needs to reopen starting switch K1; Be applicable to electric drill field.
Description
Technical field
The current foldback circuit of a kind of D.C. electric drill of the utility model, belongs to the technical field of electric drill current foldback circuit.
Background technology
Electric drill is the drilling machine utilizing electric energy to do power, it is the conventional products in electric tool, also be the electric tool series products had the call, the operation principle of electric drill is that the rotor of electromagnetic rotating formula or electromagnetic reciprocating low capacity motor does magnetic field intercepts acting running, apparatus for work is driven by transmission mechanism, driven gear strengthens the power of drill bit, thus makes drill bit scraping material surface, better pierces object; Existing market electric drill is of a great variety, the electric drill of straight flow have easy to carry, use time saving and energy saving advantage deeply by the trust of user, be widely used in the field such as construction and installation, medical application; But in the use procedure of electric drill, electric drill is stifled to be bored because the reasons such as using method is improper, service time is long easily cause, and then cause overcurrent to burn out electric drill, affect the normal use of electric drill; At present, for solving the problem that electric drill easily burns out, conventional way is by increasing stifled brill defencive function on electric drill, but this kind of electric drill price is high, is not easy to promote the use of.
Utility model content
The utility model overcomes the deficiency that prior art exists, and technical problem to be solved is: provide a kind of protective circuit preventing D.C. electric drill overcurrent.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:
A kind of current foldback circuit of D.C. electric drill, comprise: electric drill motor M 1, battery U1, the positive pole of described battery U1 is connected with one end of starting switch K1, the other end of described starting switch K1 is also connected with the collector electrode of NPN type triode Q2 after connecing one end of indicator light L1 and the collector electrode of NPN type triode Q1, the other end of described indicator light L1 is also connected with the base stage of described NPN type triode Q1 after connecing the anode of thyristor VT1, the emitter of described NPN type triode Q1 is connected with the base stage of described NPN type triode Q2, the negative electrode of described thyristor VT1 is connected with one end of the coil ZJ1.1 of relay ZJ1,
The emitter of described NPN type triode Q2 is also connected with a stiff end of adjustable resistance R2 after connecing the emitter of PNP type triode Q3 and one end of resistance R1, the base stage of described PNP type triode Q3 is connected with the movable end of adjustable resistance R2, the collector electrode of described PNP type triode Q3 is connected with one end of resistance R3, the other end of described resistance R3 is also connected with one end of resistance R4 after connecing the gate pole of described thyristor VT1, the other end of described resistance R1 is also connected with one end of the normally-closed contact ZJ1.2 of described relay ZJ1 after connecing another stiff end of described adjustable resistance R2, the other end of the normally-closed contact ZJ1.2 of described relay ZJ1 is connected with an end of incoming cables of change over switch K2, another end of incoming cables of described change over switch K2 is also connected with the negative pole of described battery U1 after connecing the other end of described resistance R4 and the other end of the coil ZJ1.1 of described relay ZJ1, the leading-out terminal of described change over switch K2 is attempted by the two ends of described electric drill motor M 1, the voltage of described battery U1 is 12V.
The beneficial effect that the utility model compared with prior art has is: the utility model can the over-current signal of testing circuit accurately, and cut-out motor power that can be quick and complete, can also give the alarm instruction, and whole circuit structure is succinct, safe and reliable, practical.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described in more detail;
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
As described in Figure 1, the current foldback circuit of a kind of D.C. electric drill of the utility model, comprise: electric drill motor M 1, battery U1, the positive pole of described battery U1 is connected with one end of starting switch K1, the other end of described starting switch K1 is also connected with the collector electrode of NPN type triode Q2 after connecing one end of indicator light L1 and the collector electrode of NPN type triode Q1, the other end of described indicator light L1 is also connected with the base stage of described NPN type triode Q1 after connecing the anode of thyristor VT1, the emitter of described NPN type triode Q1 is connected with the base stage of described NPN type triode Q2, the negative electrode of described thyristor VT1 is connected with one end of the coil ZJ1.1 of relay ZJ1,
The emitter of described NPN type triode Q2 is also connected with a stiff end of adjustable resistance R2 after connecing the emitter of PNP type triode Q3 and one end of resistance R1, the base stage of described PNP type triode Q3 is connected with the movable end of adjustable resistance R2, the collector electrode of described PNP type triode Q3 is connected with one end of resistance R3, the other end of described resistance R3 is also connected with one end of resistance R4 after connecing the gate pole of described thyristor VT1, the other end of described resistance R1 is also connected with one end of the normally-closed contact ZJ1.2 of described relay ZJ1 after connecing another stiff end of described adjustable resistance R2, the other end of the normally-closed contact ZJ1.2 of described relay ZJ1 is connected with an end of incoming cables of change over switch K2, another end of incoming cables of described change over switch K2 is also connected with the negative pole of described battery U1 after connecing the other end of described resistance R4 and the other end of the coil ZJ1.1 of described relay ZJ1, the leading-out terminal of described change over switch K2 is attempted by the two ends of described electric drill motor M 1, the voltage of described battery U1 is 12V.
Particularly, when electric drill normally uses, triode Q1 and triode Q2 conducting, the emitter of triode Q3 and the pressure drop at base stage two ends are not enough to make triode Q3 conducting, and triode Q3 ends, and thyristor VT1 also ends; Further; when circuit load is excessive; when there is the phenomenons such as stifled brill; the emitter of triode Q3 and the pressure drop at base stage two ends strengthen; triode Q3 is by ending change conducting; thyristor VT1 fast conducting, after thyristor VT1 conducting, makes the base potential of triode Q1 close to 0 volt; triode Q1 and triode Q2 ends; meanwhile, the coil ZJ1.1 of relay ZJ1 obtains electric, and the normally-closed contact ZJ1.2 of relay ZJ1 disconnects; quick and complete cut-out motor power; indicator light L1 is bright, and display is shut down, and needs to reopen starting switch K1.
In the present embodiment, the resistance of resistance R1 is very little, to reduce the loss in circuit, when regulating the movable end of adjustable resistance R2 to make the electric current of motor M 1 reach institute's limit value, there is the potential difference of 0.7 ~ 1V at the emitter of triode Q3 and base stage two ends, make triode Q3 enter conducting state; Indicator light L1 both as indicator light, again as the base resistance of triode Q1.
The current foldback circuit of the D.C. electric drill in the present embodiment comprises: electric drill motor M 1, battery U1, thyristor VT1, starting switch K1, change over switch K2, relay ZJ1, its coil is ZJ1.1, and its normally-closed contact is ZJ1.2, when circuit load is excessive, when there is the phenomenons such as stifled brill, the coil ZJ1.1 of relay ZJ1 obtains electric, and the normally-closed contact ZJ1.2 of relay ZJ1 disconnects, and indicator light L1 lights simultaneously, display is shut down, and needs to reopen starting switch K1; The utility model can the over-current signal of observation circuit accurately, when circuit overcurrent, cut-out motor power that can be quick and complete, and the instruction that gives the alarm, whole circuit structure is succinct, safe and reliable, there is substantive distinguishing features and progress, by reference to the accompanying drawings embodiment of the present utility model is explained in detail above, but the utility model is not limited to above-described embodiment, in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from the utility model aim.
Claims (2)
1. the current foldback circuit of a D.C. electric drill, comprise: electric drill motor M 1, it is characterized in that: also comprise: battery U1, the positive pole of described battery U1 is connected with one end of starting switch K1, the other end of described starting switch K1 is also connected with the collector electrode of NPN type triode Q2 after connecing one end of indicator light L1 and the collector electrode of NPN type triode Q1, the other end of described indicator light L1 is also connected with the base stage of described NPN type triode Q1 after connecing the anode of thyristor VT1, the emitter of described NPN type triode Q1 is connected with the base stage of described NPN type triode Q2, the negative electrode of described thyristor VT1 is connected with one end of the coil ZJ1.1 of relay ZJ1,
The emitter of described NPN type triode Q2 is also connected with a stiff end of adjustable resistance R2 after connecing the emitter of PNP type triode Q3 and one end of resistance R1, the base stage of described PNP type triode Q3 is connected with the movable end of adjustable resistance R2, the collector electrode of described PNP type triode Q3 is connected with one end of resistance R3, the other end of described resistance R3 is also connected with one end of resistance R4 after connecing the gate pole of described thyristor VT1, the other end of described resistance R1 is also connected with one end of the normally-closed contact ZJ1.2 of described relay ZJ1 after connecing another stiff end of described adjustable resistance R2, the other end of the normally-closed contact ZJ1.2 of described relay ZJ1 is connected with an end of incoming cables of change over switch K2, another end of incoming cables of described change over switch K2 is also connected with the negative pole of described battery U1 after connecing the other end of described resistance R4 and the other end of the coil ZJ1.1 of described relay ZJ1, the leading-out terminal of described change over switch K2 is attempted by the two ends of described electric drill motor M 1.
2. the current foldback circuit of a kind of D.C. electric drill according to claim 1, is characterized in that: the voltage of described battery U1 is 12V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420722554.8U CN204333926U (en) | 2014-11-27 | 2014-11-27 | A kind of current foldback circuit of D.C. electric drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420722554.8U CN204333926U (en) | 2014-11-27 | 2014-11-27 | A kind of current foldback circuit of D.C. electric drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204333926U true CN204333926U (en) | 2015-05-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420722554.8U Expired - Fee Related CN204333926U (en) | 2014-11-27 | 2014-11-27 | A kind of current foldback circuit of D.C. electric drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204333926U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104538931A (en) * | 2014-11-27 | 2015-04-22 | 国家电网公司 | Current foldback circuit of direct current drill |
| CN105514933A (en) * | 2016-01-08 | 2016-04-20 | 中国人民解放军军械工程学院 | Smart protection device for distribution box and distribution box having smart protection function |
-
2014
- 2014-11-27 CN CN201420722554.8U patent/CN204333926U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104538931A (en) * | 2014-11-27 | 2015-04-22 | 国家电网公司 | Current foldback circuit of direct current drill |
| CN105514933A (en) * | 2016-01-08 | 2016-04-20 | 中国人民解放军军械工程学院 | Smart protection device for distribution box and distribution box having smart protection function |
| CN105514933B (en) * | 2016-01-08 | 2018-01-09 | 中国人民解放军军械工程学院 | A kind of intelligent protection device of distribution box and the distribution box with intelligent protection function |
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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: 20150513 Termination date: 20201127 |