CN2402654Y - Cradle overload protector - Google Patents
Cradle overload protector Download PDFInfo
- Publication number
- CN2402654Y CN2402654Y CN 00219022 CN00219022U CN2402654Y CN 2402654 Y CN2402654 Y CN 2402654Y CN 00219022 CN00219022 CN 00219022 CN 00219022 U CN00219022 U CN 00219022U CN 2402654 Y CN2402654 Y CN 2402654Y
- Authority
- CN
- China
- Prior art keywords
- mouth
- connects
- hanging basket
- time delay
- delay circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a cradle overload protector. A mutual inductor is connected in series in a working motor circuit, the secondary terminal (1) of the mutual inductor which is connected with a resistor is reconnected with an input terminal of an operational amplifier, the other input terminal of the operational amplifier (2) is connected with a resistive load which is connected with a standard power supply; the output terminal of the operational amplifier is connected with an amplifier or a solid switch device, and is connected with a relay (J) which controls a motor.
Description
The utility model relates to a kind of overload protection device of weight-lifting equipment, especially the overload protection device of hanging basket.
Along with construction trade constantly develops, skyscraper is rised sheer from level ground, and many hanging baskets manufacturer also occurs simultaneously.But many hanging basket production units are unkitted safety device, the people who adds applying unit is unfamiliar with hanging basket, breach of security service regeulations, the different accident that causes takes place again and again, and the hanging basket that for example has is caught on by the obstacle of ground or metope, the user is also upwards opening by force, cause the roofing hitch to be left behind, pound and hurt sb.'s feelings, the steel cable that has has been raised mouth and has killed, also, cause steel cable to break using by force.The restraining coil cisco unity malfunction that has is also continuing use, causes Friction disk fusing, examination circle to burn out; Also have the unrestricted load carrying ability that strengthens, cause distortion of basket body even fracture etc.Existing overload protection device has mechanical; as being provided with spring and travel switch at the hanging basket frame bottom; spring presses down the shake-up travel switch when overload; also have more complicated allied equipment to have the cost height; no delay protection device can not effectively be protected the normal use that maybe can influence hanging basket to the safety of hanging basket sometimes.
The purpose of this utility model is: a kind of hanging basket overload protection device is provided, especially has the delay protection function, the normal use of hanging basket is effectively protected and do not influenced to safety that can basket.
The purpose of this utility model is achieved in that a kind of hanging basket overload protection device; it is characterized in that being provided with mutual inductor serial in the work drive motor loop; an input end of transformer out secondary concatenation operation amplifier; another input end of op amp links to each other with the ohmic load that is connected reference power supply; the mouth of op amp connects amplifier or solid switch device, and connects the relay of control motor.
Further improvement of the utility model is: be provided with the capacitor charge and discharge time delay circuit between the mouth of op amp and ground, this circuit output connects the relay that above-mentioned amplifier or solid switch device connect the control motor.
The utility model is sent load signal by transformer, by the op amp output overload signal voltage of comparing with preset voltage, and drive relay and cut off motor power, the relay of the mouth control motor of op amp, and what provide is a relay cut-off signal.And automatic power supply taking alarm, time delay circuit automatically resets behind 15 seconds or setting-up time relay is resetted, and promptly can use again.
Characteristics of the present utility model are: when the hanging basket ascent direction have obstacle to bump or below when catching on, promptly stop to rise and reporting to the police; When sky is stopped in braking or face crack adjustment power alarm at once not; It is power alarm that the steel cable knotting enters in the lifter; Surpassing certain load is power alarm, and automatic position.The utlity model has the delay protection function, can effectively protect, do not influence the normal use of hanging basket again the safety of hanging basket.
Below in conjunction with accompanying drawing and by embodiment village's utility model is described further:
Fig. 1 is the utility model circuit diagram
As shown in the figure; the hanging basket overload protection device; transformer 1 is connected on the work drive motor loop; transformer out secondary 1-1 connects a resistance R 1; resistance R 1 is an input end 2-1 of concatenation operation amplifier 2 again; another input end 2-2 connects resistance R 2, and resistance R 2 is connected with the power supply voltage of power supply, and power supply of the present utility model is a low-voltage direct working power.This direct supply comprises custom circuits such as step-down, rectification, filtering, use for light current circuit such as op amps, the mouth of op amp 2 connects amplifier 3 or solid switch device, solid switch device can be switching valve or silicon control etc., its output connects the relay of control motor, during the actuating of relay, cut off the power supply of motor.Op amp 2 can be the L324 type, can also be comparator.
Send load signal with transformer, when motor working current is big more, the transformer induced signal that goes out is high more, and it can be adjustable resistance that another input end 2-2 of amplifier connects resistance R 2, transformer inducedly when setting its current potential and be go out signal electricity district, slightly more higher setting according to running current.When the position surpass is set in load, then can normal operation, when surpassing setting value: 50mA for example, promptly cut off the electricity supply automatically by the actuating of relay.
Suppose: the motor running current is 5 amperes, 8 volts of transformer output voltages, and presetting setting voltage is 8.1 volts, when the motor normal load, electric current does not surpass 5 ampere-hours, and the source that then can not cut off the power supply is when load surpasses, electric current reaches 5A+0.05A, the transformer output signal voltage reaches 8.1 volts, and compare with preset voltage by op amp and export overload signal voltage drive relay power machine power supply, and automatic power supply taking alarm, automatically reset after 15 seconds, promptly can use again.As continue overload and then repeat said process, as be provided with above then normally using.
The time-delay purpose is when electric motor starting, do not delay time if transformer induced signal voltage is very high, detect, promptly carrying out relay moves immediately, the utility model adopts resistance R, capacitor C to discharge and recharge time delay circuit, and resistance is one fixedly to add a variable resistance, in order to the adjusting delay time, delay time length is for adapting to the motor of different capacity, and the incoming end of time delay circuit charges to capacitor C by a diode D again.Discharge and recharge in the time delay circuit, resistance is one fixedly to add a variable resistance, and the incoming end of time delay circuit connects charging capacitor C again by diode D, and the mouth that discharges and recharges time delay circuit is a coil Z, and coil Z is connected on the mouth at op amp.Like this when separating fault (comparator does not surpass threshold value), the motor normal operation does not influence again next time and reports to the police.
The motor that hanging basket uses is the motor of special-purpose band brake, and when not working when cutting off the power supply at ordinary times, the jail of stopping is to prevent to glide, and brake is to unclamp during work, but sometimes because mechanical dumb getting rusty etc. or problem such as Friction disk gap.During energising work, it is failed in time to unclamp and causes restraining coil to burn out, and be the problem that often occurs, but at this time, motor working current is very big, if used the utility model, can in time cut off the power supply, thus preventive device.
Claims (3)
1. hanging basket overload protection device; it is characterized in that being provided with mutual inductor serial in the work drive motor loop; an input end of transformer out secondary (1) concatenation operation amplifier; another input end of op amp (2) links to each other with the ohmic load that is connected reference power supply; the mouth of op amp connects amplifier or solid switch device, and connects the relay (J) of control motor.
2. by the described hanging basket overload protection device of claim 1, it is characterized in that being provided with the capacitor charge and discharge time delay circuit at the mouth of op amp, the mouth of this circuit connects above-mentioned amplifier or solid switch device connects the relay of controlling motor.
3. by the described hanging basket overload protection device of claim 2; it is characterized in that discharging and recharging in the time delay circuit; resistance is one fixedly to add a variable resistance; the incoming end of time delay circuit connects charging capacitor (C) again by diode (D); the mouth that discharges and recharges time delay circuit is a coil (Z), and coil (Z) is connected on the mouth at op amp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00219022 CN2402654Y (en) | 2000-01-04 | 2000-01-04 | Cradle overload protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00219022 CN2402654Y (en) | 2000-01-04 | 2000-01-04 | Cradle overload protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2402654Y true CN2402654Y (en) | 2000-10-25 |
Family
ID=33584272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00219022 Expired - Fee Related CN2402654Y (en) | 2000-01-04 | 2000-01-04 | Cradle overload protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2402654Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101085662B (en) * | 2007-06-21 | 2010-05-19 | 江苏三上机电制造股份有限公司 | Construction lifter excess load controller |
| CN102674100A (en) * | 2012-05-14 | 2012-09-19 | 杭州沪宁电梯配件有限公司 | Circuit for monitoring normal/abnormal work of trigger electromagnet of elevator brake |
-
2000
- 2000-01-04 CN CN 00219022 patent/CN2402654Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101085662B (en) * | 2007-06-21 | 2010-05-19 | 江苏三上机电制造股份有限公司 | Construction lifter excess load controller |
| CN102674100A (en) * | 2012-05-14 | 2012-09-19 | 杭州沪宁电梯配件有限公司 | Circuit for monitoring normal/abnormal work of trigger electromagnet of elevator brake |
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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 |