CN102267663A - Light-load system for cranes - Google Patents
Light-load system for cranes Download PDFInfo
- Publication number
- CN102267663A CN102267663A CN2011101437430A CN201110143743A CN102267663A CN 102267663 A CN102267663 A CN 102267663A CN 2011101437430 A CN2011101437430 A CN 2011101437430A CN 201110143743 A CN201110143743 A CN 201110143743A CN 102267663 A CN102267663 A CN 102267663A
- Authority
- CN
- China
- Prior art keywords
- frequency converter
- lifting
- control unit
- hoists
- signal
- 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.)
- Pending
Links
Images
Landscapes
- Control And Safety Of Cranes (AREA)
Abstract
The invention relates to a light-load system for cranes. The system comprises a PLC (Programmable Logic Controller) control unit, a lifting frequency converter and an overload limiter, wherein the lifting frequency converter is controlled by the PLC control unit and used for driving motors; the lifting frequency converter is connected with a three-phase supply by an air switch; the overload limiter is arranged on a trolley; the signal input end of the PLC control unit is respectively connected with light-load signals outputted by the overload limiter, overload signals outputted by the overload limiter, lifting input signals controlled by a driver control chamber, lifting output signals controlled by the driver control chamber, and torque signals outputted by the lifting frequency converter; and the signal output end of the PLC control unit controls the lifting frequency converter to carry out positive rotation and reverse rotation and controls the operating frequency of the lifting frequency converter respectively by first, second, third and fourth relays. By using the light-load system for cranes provided by the invention, the proportion of rated loads can be adjusted arbitrarily and then the speed multiple can be set after operation through adjusting the size of loads on the basis of the characteristics of the lifting frequency converter according to on-site situations, therefore, the light-load system for cranes is applicable to quickly light-load lifting occasions, and meets the needs of field works.
Description
Technical field
The present invention relates to a kind of hoisting crane, particularly relate to a kind of can automatically regulating speed, satisfy the hoisting crane underloading system of field activity needs.
Background technology
At present, the hoisting crane of domestic use, no matter the load weight, the maximum speed of work is maximum rated speed, this has just reduced work efficiency, and is especially extremely inapplicable in some special occasions.
Summary of the invention
Technical matters to be solved by this invention is that providing a kind of can with automatically regulating speed, satisfy the hoisting crane underloading system of the needs of field activity according to field conditions.
The technical solution adopted in the present invention is: a kind of hoisting crane underloading system, comprise: the PLC control unit, with the frequency converter that hoists that is used for drive motor by the control of PLC control unit, the described frequency converter that hoists connects three phase mains by air switch, be arranged on the load limiter on the dolly in addition, the signal input part of described PLC control unit connects the underloading signal of load limiter output respectively, the overload signal of load limiter output, lifting incoming signal by the control of driver's control cabin, torque signals by the lifting output signal of driver's control cabin control and the frequency converter that hoists output; The signal output part of described PLC control unit respectively by first to fourth relay control hoist that frequency converter just changes, counter-rotating and frequency of operation.
The signal output part of described PLC control unit connects the coil of first to fourth relay respectively, corresponding first to fourth signal input part that connects the frequency converter that hoists of the switch contact of first to fourth relay.
The switch contact of described first relay be used to control hoist frequency converter just commentaries on classics and stop, the switch contact of described second relay be used to control hoist frequency converter counter-rotating and stop, the switch contact of described the 3rd relay is used to control more than the first grade of speed of frequency converter of hoisting, and the switch contact of described the 4th relay is used to control more than the second grade of speed of frequency converter of hoisting.
Hoisting crane of the present invention underloading system can be according to field conditions, by judging the size of load, the hoist characteristics of frequency converter of application, the ratio that can regulate rated load, nominal load arbitrarily, the speed multiple is set after computing, be applicable to the occasion of underload fast lifting, satisfy the needs of field activity.
Description of drawings
Fig. 1 is a crane structure scheme drawing of the present invention;
Fig. 2 is the present invention's frequency converter external cabling circuit diagram that hoists;
Fig. 3 is a PLC control unit external cabling circuit diagram of the present invention.
Among the figure:
The 1-load limiter; The 2-PLC control unit; The 3-frequency converter that hoists; 4-driver's control cabin; The 5-control cable; XK1-underloading signal; The XK2-signal that overloads; XK3-lifting incoming signal; XK4-lifting output signal; The XK5-torque signals.
The specific embodiment
Provide specific embodiment below in conjunction with accompanying drawing, further specify hoisting crane of the present invention and how to realize with the underloading system.
As Fig. 1, Fig. 2, shown in Figure 3, hoisting crane of the present invention underloading system, comprise: PLC control unit 2, with the frequency converter 3 that hoists that is used for drive motor M by 2 controls of PLC control unit, the described frequency converter 3 that hoists connects three phase mains L1 by air switch S, L2, L3, be arranged on the load limiter 1 on the dolly in addition, the signal input part of described PLC control unit 2 connects the underloading signal XK1 of load limiter 1 output respectively, the overload signal XK2 of load limiter 1 output, lifting incoming signal XK3 by 4 controls of driver's control cabin, by the lifting output signal XK4 of driver's control cabin 4 controls and the torque signals XK5 of frequency converter 3 outputs that hoist; The signal output part of described PLC control unit 2 respectively by first to fourth relay K 0, K1, K2, K3 control hoist that frequency converter 3 is just changeing, counter-rotating and frequency of operation.
The signal output part of described PLC control unit 2 connects the coil of first to fourth relay K 0, K1, K2, K3 respectively, corresponding first to fourth signal input part S1, S2, S5, the S8 that connects the frequency converter 3 that hoists of the switch contact of first to fourth relay K 0, K1, K2, K3.
The switch contact of described first relay K 0 be used to control hoist frequency converter 3 just commentaries on classics and stop, the switch contact of described second relay K 1 be used to control hoist frequency converter 3 counter-rotating and stop, the switch contact of described the 3rd relay K 2 is used to control more than the first grade of speed of frequency converter 3 of hoisting, and the switch contact of described the 4th relay K 3 is used to control more than the second grade of speed of frequency converter 3 of hoisting.
Described load limiter has one group of overload power down function, and setting less than 20% rated load, nominal load by the PLC control unit is normally closed contact, is higher than 20% rated load, nominal load normally closed contact and becomes open contact; By the PLC control unit set the frequency converter output signal specified completely change distance more than 20% or 20% when above of rated current, signal output is arranged.
Hoisting crane of the present invention underloading system can also increase a supplemental button that links to each other with the PLC control unit and an annunciator at driver's cab, and (one group of overload signal is used for overload protection with two groups of signals; One group of underloading signal when being lower than the load of setting, can surpass command speed, high-speed cruising) be sent to the PLC control unit, the driver as when being higher than 20% rated load, nominal load, can be operated under the rated speed of rotation when manipulating crane; When being lower than 20% rated load, nominal load, annunciator is warned, and can be operated in 1.5 times of rated speed of rotation.
Hoisting crane of the present invention underloading system, underloading signal and overload signal with load limiter 1 output, the torque signals XK5 of frequency converter 3 outputs and the lifting input of driver's control cabin 4 controls hoist, output signal is transferred to PLC control unit 2 through cable 5, after computing, export, by the frequency converter 3 control motors that hoist, load limiter 1 is judged magnitude of load, as overload output signal is arranged in scope of design, the frequency converter that hoists is equally judged magnitude of load by torque and electric current, contact output is also arranged, these several signals are delivered to PLC control unit 2, after the computing, resend the frequency converter 3 that hoists, allow high-speed operation or operate in the command speed.
Claims (3)
1. hoisting crane underloading system, comprise: PLC control unit (2), with the frequency converter that hoists (3) that is used for drive motor (M) by PLC control unit (2) control, the described frequency converter that hoists (3) connects three phase mains (L1 by air switch (S), L2, L3), be arranged on the load limiter (1) on the dolly in addition, it is characterized in that the signal input part of described PLC control unit (2) connects the underloading signal (XK1) of load limiter (1) output respectively, the overload signal (XK2) of load limiter (1) output, lifting incoming signal (XK3) by driver's control cabin (4) control, by the lifting output signal (XK4) of driver's control cabin (4) control and the torque signals (XK5) of the frequency converter that hoists (3) output; The signal output part of described PLC control unit (2) respectively by first to fourth relay (K0, K1, K2, K3) control hoist that frequency converter (3) just changes, counter-rotating and frequency of operation.
2. hoisting crane according to claim 1 underloading system, it is characterized in that: the signal output part of described PLC control unit (2) connects the coil of first to fourth relay (K0, K1, K2, K3) respectively, corresponding first to fourth signal input part (S1, S2, S5, S8) that connects the frequency converter (3) that hoists of the switch contact of first to fourth relay (K0, K1, K2, K3).
3. hoisting crane according to claim 2 underloading system, it is characterized in that: the switch contact of described first relay (K0) is used for controlling the just commentaries on classics of the frequency converter (3) that hoists and stopping, the switch contact of described second relay (K1) is used for controlling the counter-rotating of the frequency converter (3) that hoists and stopping, the switch contact of described the 3rd relay (K2) is used for controlling more than first grade of speed of the frequency converter (3) that hoists, and the switch contact of described the 4th relay (K3) is used for controlling more than second grade of speed of the frequency converter (3) that hoists.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101437430A CN102267663A (en) | 2011-05-31 | 2011-05-31 | Light-load system for cranes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101437430A CN102267663A (en) | 2011-05-31 | 2011-05-31 | Light-load system for cranes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102267663A true CN102267663A (en) | 2011-12-07 |
Family
ID=45050149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101437430A Pending CN102267663A (en) | 2011-05-31 | 2011-05-31 | Light-load system for cranes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102267663A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166195A (en) * | 2011-12-19 | 2013-06-19 | 苏州默纳克控制技术有限公司 | System and method for frequency changer speed reduction protection |
| CN103663228A (en) * | 2012-09-17 | 2014-03-26 | (株)大山Inotec | Clutch type electric chain type hoist with limit switch |
-
2011
- 2011-05-31 CN CN2011101437430A patent/CN102267663A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166195A (en) * | 2011-12-19 | 2013-06-19 | 苏州默纳克控制技术有限公司 | System and method for frequency changer speed reduction protection |
| CN103166195B (en) * | 2011-12-19 | 2016-07-06 | 苏州汇川技术有限公司 | converter stall protection system and method |
| CN103663228A (en) * | 2012-09-17 | 2014-03-26 | (株)大山Inotec | Clutch type electric chain type hoist with limit switch |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101665220B (en) | Variable-frequency speed-regulating control system of crane | |
| CN111039208B (en) | Frequency conversion hoisting mechanism and tower crane | |
| CN105384084A (en) | Variable-frequency-speed-adjusting control system and method of tower-crane lifting mechanism | |
| CN103625998A (en) | Light-load and high-speed control system and light-load and high-speed control method for construction hoist | |
| CN201525701U (en) | Intelligent speed regulation and control device of crown block | |
| CN2641003Y (en) | Frequency controller for hoisting mechanism of tower crane | |
| CN113054885B (en) | Redundant switching system of tower machine converter | |
| CN205241085U (en) | Tower machine elevating system variable frequency speed control system | |
| CN102267663A (en) | Light-load system for cranes | |
| CN201557032U (en) | Variable frequency motor and potential energy loading high-speed-ratio frequency conversion system for hoisting machinery | |
| CN201976067U (en) | Variable frequency control device of fan | |
| CN203406808U (en) | Frequency conversion apparatus for taper motor of crane | |
| CN205544318U (en) | Hoisting machinery matrix energy repayment transmission system | |
| CN202170222U (en) | Light load system for crane | |
| CN202671038U (en) | Frequency conversion control device of remote control crane | |
| CN203568750U (en) | Overspeed-preventing control device of gantry hoist lifting mechanism | |
| CN203445481U (en) | Sling specialized for replacing whole 66-kilovolt isolating switch set | |
| CN105356509A (en) | Lifting machinery matrix type energy feedback transmission system | |
| CN202713224U (en) | Crane special-purpose motor stator pressure regulation speed regulation controller | |
| CN211089512U (en) | Tower crane lifting speed control system | |
| CN201506678U (en) | Descending speed regulation control device of crane without selecting load | |
| CN203879780U (en) | Fan control circuit | |
| CN203486781U (en) | Control device for preventing gyration and power-off brake during power-off of tower crane | |
| CN102142799B (en) | Silicon controlled stator voltage-regulation and speed-regulation parallel operation electric control system | |
| CN201982416U (en) | Motor pressure cutting control system and crane employing same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20111207 |