CN114906739A - Tower crane control circuit with function of hovering to prevent maloperation - Google Patents
Tower crane control circuit with function of hovering to prevent maloperation Download PDFInfo
- Publication number
- CN114906739A CN114906739A CN202210629791.9A CN202210629791A CN114906739A CN 114906739 A CN114906739 A CN 114906739A CN 202210629791 A CN202210629791 A CN 202210629791A CN 114906739 A CN114906739 A CN 114906739A
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- China
- Prior art keywords
- control circuit
- frequency converter
- relay
- delay relay
- time delay
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/22—Control systems or devices for electric drives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C15/00—Safety gear
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C15/00—Safety gear
- B66C15/06—Arrangements or use of warning devices
- B66C15/065—Arrangements or use of warning devices electrical
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Control And Safety Of Cranes (AREA)
Abstract
The invention relates to the technical field of tower cranes, and discloses a tower crane control circuit with a hovering function and capable of preventing misoperation, which comprises a frequency converter with the hovering function, a control switch, a main contactor, a band-type brake abrasion relay, a time delay relay, a main control circuit and an auxiliary control circuit, wherein the frequency converter with the hovering function is connected with the main contactor; one end of the control switch is connected with the power supply, and the other end of the control switch is connected with the main contactor; the auxiliary control circuit is connected with the main contactor in parallel; the input end of the frequency converter is connected with a power supply through a main control circuit, and the output end of the frequency converter is connected with a lifting motor; the delay relay is connected with the frequency converter through the contracting brake abrasion relay, the delay relay is connected with the control switch in parallel, the frequency converter is used for supplying power to the delay relay by the delay relay, and the contracting brake abrasion relay is used for controlling a power supply path of the delay relay. The invention can delay the power-off of the time delay relay when a hook slipping accident occurs, and avoids the loss of the function of hook slipping protection caused by the disconnection of the control switch due to the misoperation of a driver.
Description
Technical Field
The invention relates to the technical field of tower cranes, in particular to a tower crane control circuit with a hovering function for preventing misoperation.
Background
The tower crane is an auxiliary machine used for vertical transportation in the building construction process, the electric control system technology of the tower crane is newly established, and the tower crane becomes the mainstream control technology in the market at present by adopting frequency conversion control. In order to prevent the hook slipping in the hoisting process of the crane, a hovering function control technology is designed in an electric control circuit adopting a closed-loop vector control mode or an open-loop vector control mode, in the application process of the technology, if a frequency converter is in a halt state, a hook slipping accident occurs when a brake system of the tower crane is abraded, a brake failure protection function is triggered, the frequency converter outputs zero-speed high torque, a heavy object is hovered in the air at zero speed, and a driver waits for operation and operates through a control console, and the heavy object is lowered to a ground safety position. In the process, the driver is strictly prohibited to press the emergency stop button, otherwise, the hovering technology loses the protection function. Sometimes, when an operator encounters a hook slipping accident, the operator mistakenly presses the emergency stop button in an emergency, so that the hook slipping protection function is disabled.
Disclosure of Invention
The invention aims to solve the problems and provides a tower crane control circuit with a hovering function and an misoperation prevention function, which can delay the power-off of a delay relay when a hook slipping accident occurs, and avoid the phenomenon that the hook slipping protection function is disabled because a control switch is turned off due to misoperation of an operation driver.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a tower crane control circuit with a hovering function and capable of preventing misoperation comprises a frequency converter with the hovering function, a control switch, a main contactor, a band-type brake abrasion relay, a time delay relay, a main control circuit and an auxiliary control circuit;
one end of the control switch is connected with a power supply, and the other end of the control switch is connected with the main contactor; the auxiliary control circuit is connected with the main contactor in parallel and is used for controlling the action of a lifting motor and sending an alarm signal when the lifting motor is abnormal;
the input end of the frequency converter is connected with a power supply through a main control circuit, the main control circuit is used for providing power control signals for the frequency converter, and the output end of the frequency converter is connected with a lifting motor; the time delay relay passes through band-type brake wearing and tearing relay with being connected of converter, time delay relay with control switch connects in parallel, time delay relay utilizes the converter does time delay relay supplies power, band-type brake wearing and tearing relay is used for controlling time delay relay's power supply route.
Further, the control switch comprises an emergency stop button SA0 and a inching button SA1 which are connected in series, the input end of a coil KT of the time delay relay is connected to the +24V output end of the frequency converter, and a normally open auxiliary contact KT of the time delay relay is connected between the input end of the emergency stop button SA0 and the output end of the inching button SA1 in parallel; the input end of a coil 1KA3 of the band-type brake abrasion relay is connected with the frequency converter, and a normally open auxiliary contact 1KA3 of the band-type brake abrasion relay is connected in series in a power supply path of a coil KT of the time delay relay; an auxiliary normally open contact KM of the main contactor is connected with the inching button SA1 in parallel; the auxiliary control circuit is connected in parallel with the coil KM of the main contactor.
Further, the control circuit further comprises a power switch, and the emergency stop button SA0 is connected with a power supply through the power switch.
Furthermore, the control circuit further comprises an encoder matched with the hoisting motor, and the encoder is connected with the frequency converter.
Furthermore, the control circuit further comprises a master controller, wherein the master controller is connected with the input end of the frequency converter and is used for providing gear action control signals for ascending, descending and stopping for the frequency converter so as to control the lifting motor to act according to a set gear.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
according to the invention, the delay relay is connected with the control switch in parallel, the delay relay is connected with the frequency converter through the contracting brake abrasion relay, the frequency converter is used for supplying power to a coil KT of the delay relay, and the power supply channel of the delay relay is controlled through the contracting brake abrasion relay; at the moment, if a driver operates the control switch in a wrong way, but the delay relay is electrified, the parallel circuit of the delay relay and the control switch is connected, so that the main contactor is kept electrified, an operator can safely place the lifting hook on the ground through the operation of the master controller, the misoperation of the emergency stop button by the operator is avoided, and the hook sliding protection function is not effective, and the safety and reliability are realized.
Drawings
FIG. 1 is a functional block diagram of the present invention;
FIG. 2 is a schematic circuit wiring diagram of the present invention;
FIG. 3 is a schematic wiring diagram of the frequency converter of the present invention;
FIG. 4 is a circuit control schematic flow diagram of the present invention;
in the figure: 1-a frequency converter, 2-an auxiliary control circuit, 3-a master controller, 4-an encoder, 5-a master control circuit, 6-a lifting motor, 7-a power supply, 8-a power switch, 9-a band-type brake abrasion relay, 10-a control switch, 11-a time delay relay and 12-a main contactor.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms "first," "second," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
As shown in fig. 1, fig. 2 and fig. 3, a control circuit of a tower crane with a hovering function for preventing misoperation comprises a frequency converter 1 with a hovering function, a control switch 10, a main contactor 12, a brake wear relay 9, a delay relay 11, a main control circuit and an auxiliary control circuit 2. The frequency converter 1 with the hovering control function is one of frequency converters 1 in the industry, and belongs to the prior art.
One end of the control switch 10 is connected with the power supply 7, and the other end of the control switch 10 is connected with the main contactor 12; the auxiliary control circuit 2 is connected with the main contactor 12 in parallel, and the auxiliary control circuit 2 is used for controlling the action of the lifting motor 6 and sending out an alarm signal when the lifting motor is abnormal. The power supply 7 is a power supply in industrial power, and is supplied to a circuit by adjusting voltage through a transformer.
The input end of the frequency converter is connected with a power supply 7 through a main control circuit 5, and the main control circuit 5 is used for providing power control signals for the frequency converter. The main control circuit 5 is a three-phase power circuit and comprises a main control contact KM and a switch contact QM1 of the contactor, and the output end of the switch contact QM1 is connected with the input end R, S, T of the frequency converter 1. The output end of the frequency converter 1 is connected with a hoisting motor 6, and specifically, the hoisting motor 6 is connected to the U, V, W end of the frequency converter 1.
The delay relay 11 is connected with the frequency converter 1 through the contracting brake abrasion relay 9, the delay relay 11 is connected with the control switch 10 in parallel, the delay relay 11 utilizes the frequency converter to supply power for the delay relay 11, and the contracting brake abrasion relay 9 is used for controlling a power supply access of the delay relay 11.
In the embodiment, the control switch 10 comprises an emergency stop button SA0 and an inching button SA1 which are connected in series, the input end of a coil KT of the time delay relay 11 is connected to the +24V output end of the frequency converter, and a normally open auxiliary contact KT of the time delay relay 11 is connected in parallel between the input end of the emergency stop button SA0 and the output end of the inching button SA 1; the input end of a coil 1KA3 of the contracting brake abrasion relay 9 is connected with the frequency converter 1, and a normally open auxiliary contact 1KA3 of the contracting brake abrasion relay 9 is connected in series in a power supply path of a coil KT of the delay relay 11; the auxiliary normally open contact KM of the main contactor 12 is connected in parallel with the jog button SA 1. When the coil 1KA3 of band-type brake wearing relay 9 got electric, the normally open auxiliary contact 1KA3 of band-type brake wearing relay 9 was closed, and the power supply route switch-on of the coil KT input of delay relay 11 gave the coil KT circular telegram of delay relay 11, and the normally open auxiliary contact KT of delay relay 11 was closed after getting electric, the coil KM of the total contactor 12 of switch-on. The delay relay 11 is powered by a +24v output power supply of the frequency converter 1, and an auxiliary normally open contact 1KA3 of the band-type brake abrasion relay 9 is used as a switch-on switch.
The control circuit further comprises a power switch 8, and the emergency stop button SA0 is connected with a power supply through the power switch 8. The power switch 8 is a breaker switch QF 2.
The control circuit further comprises an encoder 4 matched with the lifting motor 6, and the encoder 4 is connected with the frequency converter 1. In this embodiment, the encoder 4 is a toffee encoder, the toffee encoder is connected to the PE, +15V, OV, a-, B-end of the frequency converter 1, and the frequency converter 1 forms closed-loop control over the hoisting motor 6 through the encoder 4, so that the control speed precision is high, and the speed regulation range is wide.
The control circuit further comprises a master controller 3, wherein the master controller 3 is connected with the input end of the frequency converter 1 and is used for providing gear action control signals for ascending, descending and stopping for the frequency converter so as to control the lifting motor 6 to act according to a set gear. In this embodiment, the master controller 3 is connected to the points DI3, DI4, DI5 and DI6 at the input end of the frequency converter 1.
The working principle of the invention is as follows:
as shown in fig. 4, when the tower crane is in a working state, and a driver resets the gear of the master controller 3 to a zero position, the encoder 4 detects an abnormal rotation signal, that is, the feedback speed of the encoder 4 is greater than a speed detection threshold value, and the duration time exceeds the detection time, the frequency converter 1 judges that the hook slips, the hovering function of the frequency converter 1 is started, and an alarm in the auxiliary control circuit 2 is triggered, the frequency converter 1 outputs voltage to the coil 1KA3 of the band-type brake abrasion relay 9, the normally open auxiliary contact 1KA3 of the band-type brake abrasion relay 9 is closed, the coil KT of the delay relay 11 is powered on, the auxiliary contact KT of the delay relay 11 is closed, and the driver is waited to operate the master controller 3 to place articles on the hook into a safe area. If the driver does not press the emergency stop button SA0 by mistake, the driver can operate the master controller 3 to put the hanging object in the safe area. If the driver mistakenly presses the emergency stop button SA0 at this time, the emergency stop button SA0 is turned off, when the circuit does not have the auxiliary contact KT of the delay relay 11, the main contact KM of the main contactor 12 is turned off, the input end of the frequency converter 1 is powered off, and the driver cannot operate the master controller to place the hoisted objects in a safe area. When the time delay relay 11 is added, even if the emergency stop button SA0 is pressed to turn off the emergency stop button SA0, because the coil KT of the time delay relay 11 is electrified from the frequency converter 1, the auxiliary contact KT of the time delay relay 11 is closed, the coil KM of the main contactor 12 is continuously electrified, the input end power supply of the frequency converter 1 is ensured to be continuously connected, and a driver can operate the master controller 3 to place the suspended object to a safe area.
When a driver operates the master controller 3, the alarm in the auxiliary control circuit 2 is released when the hook is operated to be hooked down, the time delay relay 11 starts to time, the driver operates the object to be hung to be placed in a safe area, when the object to be hung is placed in the safe area, the time delay relay 11 finishes the time counting, and the time delay relay 11 returns to a standby state. If the safety area is not placed in the hung object, after the timing of the delay relay 11 is finished, the emergency stop button SA0 is not reset, the delay relay 11 is disconnected, the circuit is powered off, the encoder 4 detects abnormal rotation, and the whole circuit enters a cycle state that the hovering function of the frequency converter 1 is started.
According to the invention, a delay relay 11 is connected with a control switch 10 in parallel, the delay relay 11 is connected with a frequency converter 1 through a band-type brake abrasion relay 9, the frequency converter 1 is used for supplying power to a coil KT of the delay relay 11, the band-type brake abrasion relay 9 is used for controlling a power supply path of the delay relay 11, when the frequency converter 1 is in a shutdown state, if a hook slipping accident occurs, a hovering function of the frequency converter 1 is started, and the delay relay 11 obtains power from the frequency converter 1 through the band-type brake abrasion relay 9; at this moment, if a driver operates the control switch 10 by mistake, but the delay relay 11 is electrified, the parallel circuit of the delay relay 11 and the control switch 10 is switched on, so that the main contactor 12 is kept electrified, an operator can safely place the lifting hook on the ground by operating the main controller 3, the phenomenon that the operator operates the control switch 10 by mistake to enable the hook slipping protection function to be out of action is avoided, and the safety and reliability advantages are achieved.
The invention has been described in general terms in the foregoing, but it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Therefore, modifications or improvements are within the scope of the invention without departing from the spirit of the inventive concept.
Claims (5)
1. The utility model provides a tower crane control circuit with function of hovering prevents maloperation which characterized in that: the device comprises a frequency converter with a hovering function, a control switch, a main contactor, a band-type brake abrasion relay, a time delay relay, a main control circuit and an auxiliary control circuit;
one end of the control switch is connected with a power supply, and the other end of the control switch is connected with the main contactor; the auxiliary control circuit is connected with the main contactor in parallel and is used for controlling the action of a lifting motor and sending an alarm signal when the lifting motor is abnormal;
the input end of the frequency converter is connected with a power supply through a main control circuit, the main control circuit is used for providing power control signals for the frequency converter, and the output end of the frequency converter is connected with a lifting motor; the time delay relay passes through band-type brake wearing and tearing relay with being connected of converter, time delay relay with control switch connects in parallel, time delay relay utilizes the converter does time delay relay supplies power, band-type brake wearing and tearing relay is used for controlling time delay relay's power supply route.
2. The control circuit of tower crane with hovering function for preventing malfunction according to claim 1, wherein: the control switch comprises an emergency stop button SA0 and a jog button SA1 which are connected in series, the input end of a coil KT of the time delay relay is connected to the +24V output end of the frequency converter, and a normally open auxiliary contact KT of the time delay relay is connected between the input end of the emergency stop button SA0 and the output end of the jog button SA1 in parallel; the input end of a coil 1KA3 of the band-type brake abrasion relay is connected with the frequency converter, and a normally open auxiliary contact 1KA3 of the band-type brake abrasion relay is connected in series in a power supply path of a coil KT of the time delay relay; an auxiliary normally open contact KM of the main contactor is connected with the inching button SA1 in parallel; the auxiliary control circuit is connected in parallel with the coil KM of the main contactor.
3. The control circuit of tower crane with hovering function for preventing malfunction according to claim 2, wherein: the control circuit further comprises a power switch, and the emergency stop button SA0 is connected with a power supply through the power switch.
4. The control circuit of tower crane with hovering function for preventing malfunction according to claim 1, wherein: the control circuit further comprises an encoder matched with the lifting motor, and the encoder is connected with the frequency converter.
5. The control circuit of tower crane with hovering function for preventing malfunction according to claim 1, wherein: the control circuit further comprises a master controller, wherein the master controller is connected with the input end of the frequency converter and is used for providing gear action control signals for ascending, descending and stopping for the frequency converter so as to control the lifting motor to act according to a set gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210629791.9A CN114906739A (en) | 2022-06-02 | 2022-06-02 | Tower crane control circuit with function of hovering to prevent maloperation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210629791.9A CN114906739A (en) | 2022-06-02 | 2022-06-02 | Tower crane control circuit with function of hovering to prevent maloperation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114906739A true CN114906739A (en) | 2022-08-16 |
Family
ID=82771309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210629791.9A Pending CN114906739A (en) | 2022-06-02 | 2022-06-02 | Tower crane control circuit with function of hovering to prevent maloperation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114906739A (en) |
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2022
- 2022-06-02 CN CN202210629791.9A patent/CN114906739A/en active Pending
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