CN2572669Y - Brake positioning circuit for electric driven screwdriver - Google Patents
Brake positioning circuit for electric driven screwdriver Download PDFInfo
- Publication number
- CN2572669Y CN2572669Y CN 02252364 CN02252364U CN2572669Y CN 2572669 Y CN2572669 Y CN 2572669Y CN 02252364 CN02252364 CN 02252364 CN 02252364 U CN02252364 U CN 02252364U CN 2572669 Y CN2572669 Y CN 2572669Y
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- Prior art keywords
- motor
- triode thyristor
- bidirectional triode
- brake
- relay group
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Abstract
The utility model provides a brake positioning circuit for an electric driven screwdriver. The utility model is characterized in that a first relay set and a second relay set are respectively connected with the anode of a first bidirectional thyristor (TRIAC) and the triggering end of the first bidirectional thyristor by resistors. Besides, a normally open contact of the second relay set is connected with one anode end and the triggering end of a second bidirectional thyristor (TRIAC), and a normally closed contact is directly connected to a motor. Besides, a delay circuit is arranged between excitation coils of the second relay set. When the excitation coils of the first relay set stop excitation owing to power break, and the excitation coils of the first relay set can keep the energized excitation state through the delay circuit. As a consequence, the utility model can prevent the malfunction case generated by voltage impact caused by touching a start switch by mistake when the residual voltage of the motor is not eliminated. Thus, the utility model effectively avoids resulting in burned puzzledom of active elements of the periphery of a motor driving circuit owing to short circuit occurrence.
Description
Technical field
The utility model relates to a kind of brake positioning circuit of brake positioning circuit, particularly a kind of electric screw driver.
Background technology
Even in the family, bottle opener is indispensable instrument always, and feels now in the manually inconvenience of wasting time and energy and being brought on ladder is done, and impels the appearance of electric screw driver in industrial applicability; General typical case commonly uses electric screw driver 1 (as shown in Figure 1), it mainly is to be provided with a motor 12 in a bottle opener body 11, and then be provided with a screwdriver head 13 in motor 12 front ends, and with motor 12 linking one drive circuits 14, and connect in drive circuit 14 and to establish a starting switch 15,15 of this starting switches are located at bottle opener body 11 outer rims, are beneficial to operation; Yet; this is commonly used ubiquitous topic of electric screw driver and is: the Yin Mada of its regular meeting can't in time cut off; cause the screw closure tension and produce the phenomenon of debentition; therefore many now to orientate its improvement target as at brake; as this case applicant in previous Taiwan application case number No. 75205877, No. 77204795; it all is by an actuating mechanism, and the power on/off of control starting switch and stop switch (brake control device), but it can have following disappearance generally:
Commonly use disappearance
1, its breakover element conduction terminal often must directly be born big electric current, and produces the danger of spark.
2, often survey too sensitivity of element because of brake signal prestige, and under the situation of or big voltage error unstable in power supply, and cause the active element of motor drive circuit to produce the awkward situation of burning damage.
3, be subject to that the contiguous electric equipment in workplace disturbs or because of artificial improper operation (as: when not finishing the brake action as yet), even cause the situation of burning because of short circuit.
4, do not have a practicality.
Learn that from the above mentioned the electric screw driver of commonly using still remains the part improved, hereat, how above-mentioned disappearance is forgone, be the technical difficulties place that this case creator institute desire solves.
In view of this, this case creator is with professional attainment and technical concept that itself was possessed, and the breakthrough improvement through repeatedly makes the utility model be born eventually.
Summary of the invention
Technical problem to be solved in the utility model is, above-mentioned deficiency at prior art, and provide a kind of brake positioning circuit of electric screw driver, this circuit can prevent when the residual voltage of motor is not also eliminated as yet, if the false touch starting switch causes voltage to impact mutually and produces misoperation, burn even cause the peripheral active element of motor drive circuit to be short-circuited; Can effectively avoid screwdriver head being brought the inertia of rotation because of residual electric power; Under the situation of high voltage and big electric current, still can keep its correct operation.
Above-mentioned technical problem of the present utility model is realized by following technical scheme.
A kind of brake positioning circuit of electric screw driver is characterized in that comprising:
One power supply start unit, whether it is to comprise first bridge rectifier, second bridge rectifier, first bidirectional triode thyristor and starting switch, use the control power supply and start;
One driver element, it is to comprise a motor and one second bidirectional triode thyristor, and this second bidirectional triode thyristor be with aforementioned first bridge rectifier between form in parallel;
One brake control unit, it is by the first relay group, the second relay group, silicon controlled rectifier is formed, and be controlled by a brake sensing element, and the normal opened contact of second relay is connected in the aforementioned second The Trigger of Bidirectional Triode Thyristor end, when mat arrives setting torsion in motor, even aforesaid first bridge rectifier and second bidirectional triode thyristor form the sealing short circuit, to eliminate the residual electric power of motor, and cut off positioning motor immediately, and between the magnetizing coil of the first relay group and the second relay group, be provided with a delay circuit, use the ON time that postpones the second relay group and the effect that reaches certain location.
Except that above-mentioned essential features, in specific implementation process, also can replenish following technology contents:
Described brake sensing element is to set a fixing torsion, its in addition end then be connected in motor one end of driver element constituting loop, and negative electrode is directly imported earth terminal.
With after the normally closed contact of second relay is connected in series mutually, the anode with first bidirectional triode thyristor is connected respectively, and is connected with its trigger end by resistance with the common joint of first relay.
The normal opened contact of the second relay group is then behind the positive terminal that is connected first bridge rectifier and motor, be connected by the anode tap of resistance again with second bidirectional triode thyristor, and its common contact is attached to its trigger end, after normally closed contact then is connected the cathode terminal and first bridge rectifier of second bidirectional triode thyristor respectively, be arranged in the negative pole end of motor again.
The anode tap of this silicon controlled rectifier is magnetizing coil one end that is connected in the second relay group, and control is extreme then by being connected in an end of the fair part of a brake sensing.
In between the starting switch and first bidirectional triode thyristor, establish a thermocouple.
In a surge absorber in parallel between first bidirectional triode thyristor and motor.
The brake positioning circuit of a kind of electric screw driver provided by the utility model, it mainly is that one first relay group and one second relay group are connected with its trigger end with the anode of first bidirectional triode thyristor (TRIAC) and by resistance respectively, again the first relay group is connected mutually with the magnetizing coil and the normally closed contact of the second relay group, the normal opened contact of the second relay group then is connected in second bidirectional triode thyristor (TRIAC) one anode tap and is attached to its trigger end, normally closed contact then directly is arranged in motor, reach and between the magnetizing coil of the second relay group, be provided with a delay circuit, make it to use the ON time that postpones the second relay group, use prevention when the residual voltage of motor is not also eliminated as yet, if the false touch starting switch causes voltage to impact mutually and produces misoperation, even the awkward situation that causes the peripheral active element of motor drive circuit to be short-circuited and to burn.
The brake positioning circuit of a kind of electric screw driver provided by the utility model, wherein reach when preestablishing torsion when the tightness of revolution screw, even form open circuit between the first relay group and the second relay group, make first bidirectional triode thyristor (TRIAC) end again because of can not get trigger voltage, while is because of the normal opened contact closure of the second relay group, make the residual supply voltage of motor between second bidirectional triode thyristor (TRIAC), form loop, use the inertia of effectively avoiding screwdriver head being brought rotation because of residual electric power, and screw is damaged, so can effectively reach the effect of certain location.
The brake positioning circuit of a kind of electric screw driver provided by the utility model, wherein each other controlling signal is all used jumbo contact (as: relay, bidirectional triode thyristor ... Deng) as breakover element, therefore can under the situation of high voltage and big electric current, still can keep its correct operation.
Advantage of the present utility model:
1, its controlling signal out of the ordinary (electric current) all uses jumbo contact as breakover element, so operation that still can be safe and certain under the state of high voltage and big electric current.
2, its sensing element has insensitivity for the supply voltage of supply, therefore under the unstable situation about reaching than big voltage error of power supply, still can keep correct operation.
3, when standby, can not consume any power source power, so can the safer and saving energy.
4, can avoid interference the electric equipment that the workplace is close to.
5, when because of artificial improper operation, can do current protection, burn to guarantee that integrated circuit is unlikely.
6, tool practicality.
7, tool industrial competitiveness.
Be convenient and understand content of the present utility model, and the effect that can reach, now enumerate a specific embodiment and conjunction with figs. in detail introduction be described as follows:
Description of drawings
Fig. 1 is the schematic appearance of general electric screw driver.
Fig. 2 is the circuit diagram of a preferred embodiment of the present utility model.
Embodiment
As shown in Figure 2, the utility model provides a kind of brake positioning circuit of electric screw driver, and it mainly comprises:
One power supply start unit 2, it is to comprise the first bridge rectifier C01, the second bridge rectifier C02, start and the controlling signal DC power supply to provide respectively, and between the input endpoint of input induction coil L and the first bridge rectifier C01 and the second bridge rectifier C02, be connected capacitor C 1, C2 and resistance R 6, use the effect that reaches rectifying and wave-filtering; One first bidirectional triode thyristor (TRIAC) TR1 and a starting switch S1, and the cathode terminal of first bidirectional triode thyristor (TRIAC) TR1 is connected in the power end of the first bridge rectifier C01, and and be connected with a current-limiting resistance R1 between trigger end, use the control power supply and whether start;
One driver element 3, it comprises a motor M, to drive the bottle opener running: one second bidirectional triode thyristor (TRIAC) TR2, and be connected in series with the first bridge rectifier C01 by resistance R 2;
One brake control unit 4, it comprises the first relay group S5, the second relay group S3, S4, a silicon controlled rectifier (SCR) and a brake sensing element S2, wherein be with after the normally closed contact of the second relay S4 is connected in series mutually with the common joint of the first relay S5, anode with first bidirectional triode thyristor (TRIAC) TR1 is connected respectively, and be connected with its trigger end by resistance R 5, again with the magnetizing coil LA of the first relay group S5 and the second relay group S4, LB is connected by resistance R 8, wherein the normal opened contact of the second relay group S3 is then behind the positive terminal that is connected the first bridge rectifier C01 and motor M, be connected with the anode tap of second bidirectional triode thyristor (TRIAC) TR2 by resistance R 2 again, reach its common contact one end through resistance R 3, be attached to its trigger end again after the R4 current limliting dividing potential drop, after normally closed contact then was connected the cathode terminal and the first bridge rectifier C01 of second bidirectional triode thyristor (TRIAC) TR2 respectively, the negative pole end that is arranged in motor M again was to form a loop; And the anode tap of silicon controlled rectifier (SCR) is connected in magnetizing coil LB one end of the second relay group S4, control is extremely then by resistance R 10, the integrating circuit 5 that R11 and capacitor C 5 are formed is connected in the end of a brake sensing element S2, and this brake sensing element S2 can set a fixing torsion, it is held in addition and then is connected in the motor M of driver element 3 end to constitute loop, and the negative electrode of silicon controlled rectifier (SCR) directly imported earth terminal (Ground), an and RC delay circuit 6 of being formed by resistance R 9 and capacitor C 4, be to be arranged between the magnetizing coil LB of the second relay group S4, use the ON time that postpones the second relay group S4;
Wherein, when pressing starting switch S1, promptly by forming the conducting loop between the anode of the normally closed contact of the first relay group S5 and the second relay group S4 and first bidirectional triode thyristor (TRIAC) TR1 and its trigger end, after making the first bridge rectifier C01 conducting, form power circuit with motor M, so that motor can drive the rotate action of screw of screwdriver head, this moment the second bridge rectifier C02 and the first relay group S5 and the second relay group S4 magnetizing coil LA, LB does not then sense default torsion as yet because of brake sensing element S2, converting the voltage that is enough to drive silicon controlled rectifier SCR to, and be off state;
Again, when the tightness of revolution screw reaches when preestablishing torsion, even silicon controlled rectifier SCR triggers during conducting, be about to that DC power supply voltage that the second bridge rectifier C02 supplied with then imports earth terminal by magnetizing coil LA and excitatory, and after providing one to postpone buffer time by the delay circuit 5 that resistance R 9 and capacitor C 4 are formed, to import earth terminal behind the magnetizing coil LB again, so that then form open circuit between the first relay group S5 and the second relay group S4 in succession, multiple modern first bidirectional triode thyristor (TRIAC) TR1 ends because of can not get trigger voltage, while is because of the normal opened contact closure of the second relay group S3, make the residual supply voltage of the first bridge rectifier C01 and motor M through between resistance R 2 and second bidirectional triode thyristor (TRIAC) TR2, form loop, use the inertia of effectively avoiding screwdriver head being brought rotation because of residual electric power, and screw is damaged, so can effectively reach the effect of certain location, so brake mechanism need not be additionally added, and cost of manufacture can be effectively saved;
In addition, the utility model is to be located between the magnetizing coil LB of the second relay group S4 by the delay circuit 5 that resistance R 9 and capacitor C 4 are formed, when magnetizing coil LB is excitatory, can absorb power supply by capacitor C 4, the magnetizing coil LA that makes the first relay group S5 to close as starting switch S1 stops when excitatory because of outage, can be discharged to magnetizing coil LB by capacitor C 4, to keep its energization excitation state, make it to prevent when the residual voltage of motor M is not also eliminated as yet, if the awkward situation that the peripheral active element that false touch starting switch S1 (RESET) causes voltage to impact its drive circuit that misoperation causes that produces mutually is short-circuited and burns, and this time constant number can resistance R 9 obtains (τ=R * C) with the product of capacitor C 4, therefore can variable-resistance form design, and have convenient and practical property.
Moreover, the utility model is further to establish a thermocouple PTC between starting switch S1 and first bidirectional triode thyristor (TRIAC) TR1, make in the time of to be higher than preset value in the curtage of power supply, even its impedance reaches and levels off to infinity, produce between first bidirectional triode thyristor (TRIAC) and starting switch by the state of opening a way and make, and can be in a surge absorber A1 in parallel between first bidirectional triode thyristor (TRIAC) TR2 and motor M, use and reach the purpose of keeping the power supply quality.
In sum, the utility model is being broken through under the prior art configurations, really reached the effect that institute's desire is promoted, and also non-be familiar with this skill person institute easily full of beard and, moreover, not open before the utility model application, the progressive of its tool, practicality, show and to have met novel patent and respectively apply for important document, the whence proposes novel application in accordance with the law.
But the above only is of the present utility model one preferable possible embodiments, non-so promptly arrest limit claim of the present utility model, so equivalent structure that uses the utility model specification and diagramatic content to do such as, directly or indirectly apply to other correlative technology field person, all in like manner all ought to be contained in the scope of spiritual category of the present utility model, and close and give Chen Ming.
Claims (7)
1, a kind of brake positioning circuit of electric screw driver is characterized in that comprising:
One power supply start unit, whether it is to comprise first bridge rectifier, second bridge rectifier, first bidirectional triode thyristor and starting switch, use the control power supply and start;
One driver element, it is to comprise a motor and one second bidirectional triode thyristor, and this second bidirectional triode thyristor be with aforementioned first bridge rectifier between form in parallel;
One brake control unit, it is by the first relay group, the second relay group, silicon controlled rectifier is formed, and be controlled by a brake sensing element, and the normal opened contact of second relay is connected in the aforementioned second The Trigger of Bidirectional Triode Thyristor end, when mat arrives setting torsion in motor, even aforesaid first bridge rectifier and second bidirectional triode thyristor form the sealing short circuit, to eliminate the residual electric power of motor, and cut off positioning motor immediately, and between the magnetizing coil of the first relay group and the second relay group, be provided with a delay circuit, use the ON time that postpones the second relay group and the effect that reaches certain location.
2, the brake positioning circuit of electric screw driver according to claim 1, it is characterized in that: described brake sensing element is to set a fixing torsion, its in addition end then be connected in motor one end of driver element constituting loop, and negative electrode is directly imported earth terminal.
3, the brake positioning circuit of electric screw driver according to claim 1, it is characterized in that: with the common joint of first relay with after the normally closed contact of second relay is connected in series mutually, anode with first bidirectional triode thyristor is connected respectively, and is connected with its trigger end by resistance.
4, the brake positioning circuit of electric screw driver according to claim 1, it is characterized in that: the normal opened contact of the second relay group is then behind the positive terminal that is connected first bridge rectifier and motor, be connected by the anode tap of resistance again with second bidirectional triode thyristor, and its common contact is attached to its trigger end, after normally closed contact then is connected the cathode terminal and first bridge rectifier of second bidirectional triode thyristor respectively, be arranged in the negative pole end of motor again.
5, the brake positioning circuit of electric screw driver according to claim 1 is characterized in that: the anode tap of this silicon controlled rectifier is magnetizing coil one end that is connected in the second relay group, and control is extreme then by being connected in an end of the fair part of a brake sensing.
6, the brake positioning circuit of electric screw driver according to claim 1 is characterized in that: establish a thermocouple between the starting switch and first bidirectional triode thyristor.
7, the brake positioning circuit of electric screw driver according to claim 1 is characterized in that: in a surge absorber in parallel between first bidirectional triode thyristor and motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02252364 CN2572669Y (en) | 2002-10-11 | 2002-10-11 | Brake positioning circuit for electric driven screwdriver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02252364 CN2572669Y (en) | 2002-10-11 | 2002-10-11 | Brake positioning circuit for electric driven screwdriver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2572669Y true CN2572669Y (en) | 2003-09-10 |
Family
ID=33721874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02252364 Expired - Fee Related CN2572669Y (en) | 2002-10-11 | 2002-10-11 | Brake positioning circuit for electric driven screwdriver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2572669Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101257259B (en) * | 2007-12-28 | 2010-06-09 | 彩虹显示器件股份有限公司 | Hand-held electric bottle opener special electric power |
| CN102484447A (en) * | 2009-03-03 | 2012-05-30 | 罗伯特·博世有限公司 | Electrodynamic braking device for universal motor |
| TWI501493B (en) * | 2013-06-13 | 2015-09-21 | Universal Scient Ind Shanghai | Starting engine protector with delay circuit and delay circuit thereof |
| TWI689150B (en) * | 2018-08-14 | 2020-03-21 | 建準電機工業股份有限公司 | Power-off braking system and braking method for a motor |
-
2002
- 2002-10-11 CN CN 02252364 patent/CN2572669Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101257259B (en) * | 2007-12-28 | 2010-06-09 | 彩虹显示器件股份有限公司 | Hand-held electric bottle opener special electric power |
| CN102484447A (en) * | 2009-03-03 | 2012-05-30 | 罗伯特·博世有限公司 | Electrodynamic braking device for universal motor |
| CN102484447B (en) * | 2009-03-03 | 2015-05-06 | 罗伯特·博世有限公司 | Electrodynamic braking device for universal motor |
| TWI501493B (en) * | 2013-06-13 | 2015-09-21 | Universal Scient Ind Shanghai | Starting engine protector with delay circuit and delay circuit thereof |
| TWI689150B (en) * | 2018-08-14 | 2020-03-21 | 建準電機工業股份有限公司 | Power-off braking system and braking method for a motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |