CN111747328A - Tilting prevention system for lifting arm of movable arm tower crane - Google Patents
Tilting prevention system for lifting arm of movable arm tower crane Download PDFInfo
- Publication number
- CN111747328A CN111747328A CN202010788176.3A CN202010788176A CN111747328A CN 111747328 A CN111747328 A CN 111747328A CN 202010788176 A CN202010788176 A CN 202010788176A CN 111747328 A CN111747328 A CN 111747328A
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- CN
- China
- Prior art keywords
- boom
- angle
- tower crane
- operating handle
- main controller
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- 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.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/88—Safety gear
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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
- B66C13/16—Applications of indicating, registering, or weighing devices
-
- 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
- B66C13/40—Applications of devices for transmitting control pulses; Applications of remote control devices
- B66C13/44—Electrical transmitters
-
- 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
- B66C13/48—Automatic control of crane drives for producing a single or repeated working cycle; Programme control
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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
- B66C13/50—Applications of limit circuits or of limit-switch arrangements
Abstract
The invention discloses an anti-overturning system for a lifting arm of a movable arm tower crane. The system comprises an angle feedback component and a detection switch, wherein the angle feedback component is used for acquiring the angle of the crane boom, the detection switch comprises two detection switches, the detection switches are respectively arranged on two sides of the control direction of an amplitude-variable operating handle, the detection switches are used for detecting the action signal of the amplitude-variable operating handle, the angle feedback component and the detection switch are connected with a master controller, the detection switches send the detected action signal of the amplitude-variable operating handle to the master controller, the master controller receives the action signal of the amplitude-variable operating handle, whether the angle change of the crane boom is normal within the set time is monitored, the master controller is connected with an alarm, and when the angle change of the crane boom is. The invention can inform a driver of timely operating the rotation action through the alarm to adjust the direction of the suspension arm to the downwind direction, thereby avoiding the suspension arm of the tower crane from tipping backwards or falling down suddenly due to weightlessness caused by strong wind.
Description
Technical Field
The invention relates to the technical field of a swing arm tower crane, in particular to an anti-overturn system for a cargo boom of the swing arm tower crane.
Background
With the increasing of large buildings and high-rise buildings, the number of tower cranes is also increasing. The large number of the swing-arm cranes are high in mounting position and high in altitude wind speed, so that the tower crane bears larger wind load. According to the operation specification of the tower crane, the hoisting operation of the tower crane is forbidden when the wind speed is too high, but the tower crane suddenly comes by strong wind in the actual work, and the tower crane can stop working until the tower crane continues to work to place hoisted objects at a safe position. If the instantaneous wind speed is too large, the weight of the hanging object is too light or no load exists, if the hanging arm is just positioned in the windward direction at the moment, the wind load is greater than the self weight of the hanging arm, and even if the amplitude of the operation is changed forwards, the horizontal wind load cannot be changed. If the driver does not find the situation that the instantaneous wind speed is too high, the driver still operates the amplitude variation forward to act, the hidden trouble of amplitude variation winch idling exists, the suspension arm can fall suddenly, and safety accidents are caused.
Disclosure of Invention
The invention aims to provide an anti-overturning system for a lifting arm of a movable arm tower crane, aiming at the defects in the prior art.
In order to achieve the purpose, the invention provides a boom overturn prevention system of a movable arm tower crane, which comprises two angle feedback components and two detection switches, wherein the two angle feedback components are used for acquiring the angle of a boom, the two detection switches are respectively arranged on two sides of the control direction of a variable-amplitude operating handle and are used for detecting action signals of the variable-amplitude operating handle, the angle feedback components and the detection switches are connected with a main controller, the detection switches send the detected action signals of the variable-amplitude operating handle to the main controller, the main controller monitors whether the angle change of the boom is normal within set time when receiving the action signals of the variable-amplitude operating handle, the main controller is connected with an alarm, and when the angle change of the boom is abnormal, the main controller controls the alarm to give an alarm.
Further, the angle feedback component comprises an angle sensor, the angle sensor is arranged on a boom of the swing arm tower crane, the main controller acquires the current angle of the boom and times when receiving an action signal of the variable-amplitude operating handle, and acquires the angle of the boom again at a set time, and the main controller judges whether the angle change of the boom is consistent with the control direction of the variable-amplitude operating handle or not by comparing the sizes of the two acquired angles of the boom, so as to monitor whether the angle change of the boom is normal within the set time.
The multifunctional travel switch is used for acquiring the rope outlet amount of the variable-amplitude winch steel wire rope, the multifunctional travel switch is connected with the main controller to feed the rope outlet amount of the variable-amplitude winch steel wire rope back to the main controller through a voltage signal, the main controller calculates the angle of the lifting arm according to the rope outlet amount and sets an angle difference threshold value of the lifting arm, and when the absolute value of the difference between the angle calculated by the main controller according to the rope outlet amount and the angle acquired by the angle sensor exceeds the set angle difference threshold value, the main controller controls the alarm to give an alarm.
Further, the boom angle difference threshold is 2 °.
Furthermore, the main controller is a programmable controller, and a signal transmitter is connected between the angle sensor and the programmable controller.
Further, the set time is 2S.
Further, the model of the angle sensor is JD-180.
Furthermore, the model of the multifunctional travel switch is DXZ-1: 78.
Furthermore, the model of the signal transmitter is LCT6-JPA 0101.
Furthermore, the alarm is an audible and visual alarm, and the type number of the alarm is ND16-22 FS.
Has the advantages that: the angle of the crane boom is detected, the action signal of the variable-amplitude operating handle is acquired by arranging the detection switch, so that whether the angle change direction of the crane boom is consistent with the control direction of the variable-amplitude operating handle or not is judged, the rope outlet amount of the variable-amplitude winch is acquired, the theoretical angle of the crane boom is calculated according to the rope outlet amount, and when the angle change direction of the crane boom is inconsistent with the control direction of the variable-amplitude operating handle or the absolute value of the difference between the calculated theoretical angle and the actual angle exceeds a set threshold value, the main controller can inform a driver through the alarm, so that the driver timely operates the slewing motion, the direction of the crane boom is adjusted to the downwind direction, and the falling accident that the crane boom topples backwards or suddenly loses weight caused by strong wind is avoided.
Drawings
FIG. 1 is a schematic structural diagram of a boom overturning prevention system of a movable arm tower crane according to an embodiment of the invention;
FIG. 2 is a schematic block diagram of a boom overturn prevention system of a luffing jib tower crane according to an embodiment of the invention;
fig. 3 is a schematic diagram illustrating the principle of calculating the boom angle by the rope discharge amount of the wire rope.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific examples, which are carried out on the premise of the technical solution of the present invention, and it should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1 and 2, an embodiment of the present invention provides an anti-overturning system for a boom of a boom tower crane, wherein the boom tower crane includes a swing mechanism 1, a boom 2 is hinged to the swing mechanism 1, a balance arm 3 and a press rod 4 are further fixed, a luffing winch 5, a pull rod 6, a counterweight 7 and the like are arranged on the balance arm, the pull rod 6 is fixedly connected to an upper end of the press rod 4, a pulley is fixed to an upper end of the pull rod 6 and the press rod 4, and a steel wire rope 8 of the luffing winch 5 is fixed to an outer end of the boom 2 through the pulley at an upper end of the pull rod 6 and the press rod 4. This system includes angle feedback part 9 and detection switch 10, angle feedback part 9 is used for acquireing the angle of jib loading boom 2, detection switch 10 includes two, can adopt like travel switch and proximity switch, set up respectively in the both sides of the control direction of becoming width of cloth operating handle for detect the action signal of becoming width of cloth operating handle, it is concrete, when jib loading boom 2 that luffing jib tower machine driver controlled luffing jib tower machine through the luffing jib loading boom operating handle carries out the variable width operation, luffing jib operating handle can touch detection switch 10 in the action direction, thereby acquire the action signal of the operating handle that becomes width of cloth. The angle feedback part 9 and the detection switch 10 are connected with a main controller 11, the detection switch 10 sends a detected action signal of the variable-amplitude operating handle to the main controller 11, the main controller 11 monitors whether the angle change of the crane arm 2 is normal within a set time when receiving the action signal of the variable-amplitude operating handle, the main controller 11 is connected with an alarm 12, when the angle change of the crane arm 2 is abnormal, the main controller 11 controls the alarm 12 to give an alarm to prompt a driver to carefully drive, and meanwhile, the variable-amplitude action of the tower crane is forbidden through electrical interlocking. The alarm 12 is preferably an audible and visual alarm, preferably of the type ND16-22 FS.
The angle feedback component 9 of the embodiment of the invention preferably adopts an angle sensor, the preferred model of the angle sensor is JD-180, the angle sensor is arranged on the crane boom 2 of the movable arm tower crane, and the angle sensor synchronously moves along with the crane boom 2, so that the angle of the crane boom 2 can be fed back in real time. When the main controller 11 receives the action signal of the variable-amplitude operating handle acquired by the detection switch 10, the main controller 11 acquires the current angle of the boom 2 and times, and acquires the angle of the boom 2 again at the set time, and the main controller 11 judges whether the angle change of the boom 2 is consistent with the control direction of the variable-amplitude operating handle by comparing the sizes of the twice acquired angles of the boom 2, thereby realizing monitoring whether the angle change of the boom 2 is normal within the set time.
The embodiment of the invention also comprises a multifunctional travel switch 13, and the model of the multifunctional travel switch 13 is preferably DXZ-1: 78. The multifunctional travel switch 13 is connected with the variable amplitude winch 5, specifically, a detection shaft of the multifunctional travel switch 13 is connected with an output shaft of the variable amplitude winch 5, when the variable amplitude winch 5 is controlled to rotate by a variable amplitude operation handle, the detection shaft of the multifunctional travel switch 13 can rotate along with the variable amplitude winch 5, a potentiometer is arranged inside the multifunctional travel switch 13, the number of rotation turns of the detection shaft of the multifunctional travel switch 13 is changed by the transformation ratio of the internal inherent coefficient thereof, a voltage signal output by the potentiometer inside the multifunctional travel switch 13 is changed, the number of rotation turns of the variable amplitude winch 5 can be obtained through the change of the voltage signal output by the potentiometer, so that the rope outlet quantity of the steel wire rope 8 of the variable amplitude winch 5 can be obtained, the multifunctional travel switch 13 is connected with the main controller 11, so as to feed back the rope outlet quantity of the steel wire rope 8 of the variable amplitude winch 5 to the main controller 11 by the voltage, the main controller 11 calculates the angle of the lifting arm according to the rope outlet amount.
Specifically, the detailed description is given by combining the structure of the boom tower crane, as shown in fig. 2 and 3, a triangular structure is formed by the boom 2, the pressure lever 4, and the steel wire rope 8 between the top end of the pressure lever 4 and the front end of the boom 2, the plane included angle between the pressure lever 4 and the swing mechanism 1 is a fixed angle E, the length c of the pressure lever and the length b of the boom 2 are fixed values, and the length of the steel wire rope 8 of the luffing winch 5 between the top end of the pressure lever 4 and the luffing winch 5 is also a fixed value, so that the length a of the steel wire rope 8 between the top end of the pressure lever 4 and the front end of the boom 2 can be calculated by the total rope output amount, and further, the cosine value cosA of the included angle a between the pressure lever 4 and the:
cosA＝(b2+c2-a2)/2bc
after cosA is obtained, the value of the angle A can be obtained through an inverse trigonometric function formula.
Angle E is known, so boom angle D is:
D＝E-A
the master controller 11 is also used to set an angular difference threshold for the boom 2, the angular difference threshold for the boom 2 preferably being set to 2 °. When the absolute value of the difference between the angle D calculated by the main controller 11 according to the rope outlet amount and the angle obtained by the angle sensor exceeds the set angle difference threshold value, the main controller 11 controls the alarm 12 to give an alarm to prompt a driver to drive cautiously, and the amplitude variation action of the tower crane is forbidden through electrical interlocking.
The main controller 11 of the embodiment of the present invention preferably employs a programmable controller, and may employ a programmable controller originally used for controlling a boom tower crane, which is provided in a cab. When the angle sensor and the programmable controller are adopted, a signal transmitter 14 is also required to be connected between the angle sensor and the programmable controller, and the preferred model of the signal transmitter 14 is LCT6-JPA 0101.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that other parts not specifically described are within the prior art or common general knowledge to those of ordinary skill in the art. Without departing from the principle of the invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the scope of the invention.
Claims (10)
1. The utility model provides a swing arm tower machine jib loading boom system of preventing toppling which characterized in that, includes angle feedback part and detection switch, the angle feedback part is used for acquireing the angle of jib loading boom, detection switch includes two, sets up respectively in the both sides of the control direction who becomes width of cloth operating handle for detect the action signal who becomes width of cloth operating handle, angle feedback part and detection switch are connected with the master controller, detection switch sends the action signal who becomes width of cloth operating handle that detects to the master controller, the master controller is when receiving the action signal who becomes width of cloth operating handle, and the monitoring is normal at the angular variation of jib loading boom in the settlement time, the master controller is connected with the alarm, when the angular variation of jib loading boom is unusual, the master controller control alarm sends the warning.
2. The system of claim 1, wherein the angle feedback component comprises an angle sensor, the angle sensor is arranged on a boom of the swing arm tower crane, the main controller acquires the current boom angle and times when receiving an action signal of a variable-amplitude operating handle, and acquires the boom angle again at a set time, and the main controller judges whether the boom angle change is consistent with the control direction of the variable-amplitude operating handle by comparing the boom angles acquired twice, thereby monitoring whether the boom angle change is normal within the set time.
3. The boom overturn prevention system of a movable arm tower crane according to claim 2, further comprising a multifunctional travel switch arranged on the variable amplitude winch, wherein the multifunctional travel switch is used for acquiring the rope outlet amount of the variable amplitude winch steel wire rope, the multifunctional travel switch is connected with the main controller so as to feed the rope outlet amount of the variable amplitude winch steel wire rope back to the main controller as a voltage signal, the main controller calculates the angle of the lifting arm according to the rope outlet amount and sets an angle difference threshold value of the lifting arm, and when the absolute value of the difference between the angle calculated by the main controller according to the rope outlet amount and the angle acquired by the angle sensor exceeds the set angle difference threshold value, the main controller controls the alarm to give an alarm.
4. The boom tower crane boom overturn prevention system of claim 1, wherein the boom angle difference threshold is 2 °.
5. The system of claim 1, wherein the main controller is a programmable controller, and a signal transmitter is connected between the angle sensor and the programmable controller.
6. The boom tower crane boom overturn prevention system of claim 1, wherein the set time is 2S.
7. The boom tower crane boom overturn prevention system of claim 2, wherein the type of the angle sensor is JD-180.
8. The boom tower crane boom overturn prevention system of claim 3, wherein the multifunctional travel switch is dxxz-1: 78 in model number.
9. The boom tower crane boom overturn prevention system of claim 5, wherein the signal transmitter is of a model of LCT6-JPA 0101.
10. The boom tower crane boom overturn prevention system as claimed in claim 1, wherein the alarm is an audible and visual alarm of type ND16-22 FS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010788176.3A CN111747328A (en) | 2020-08-07 | 2020-08-07 | Tilting prevention system for lifting arm of movable arm tower crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010788176.3A CN111747328A (en) | 2020-08-07 | 2020-08-07 | Tilting prevention system for lifting arm of movable arm tower crane |
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| CN111747328A true CN111747328A (en) | 2020-10-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010788176.3A Pending CN111747328A (en) | 2020-08-07 | 2020-08-07 | Tilting prevention system for lifting arm of movable arm tower crane |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU206784U1 (en) * | 2020-11-02 | 2021-09-28 | Федеральное государственное казенное военное образовательное учреждение высшего образования "Военная академия материально-технического обеспечения имени генерала армии А.В. Хрулёва" | DEVICE TO PREVENT TIPPING CRANE-BOOM FOR WORKSHOP MRS-ARM |
| CN114348887A (en) * | 2022-03-21 | 2022-04-15 | 杭州杰牌传动科技有限公司 | Intelligent monitoring and early warning system and method based on tower crane rotation action model |
-
2020
- 2020-08-07 CN CN202010788176.3A patent/CN111747328A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU206784U1 (en) * | 2020-11-02 | 2021-09-28 | Федеральное государственное казенное военное образовательное учреждение высшего образования "Военная академия материально-технического обеспечения имени генерала армии А.В. Хрулёва" | DEVICE TO PREVENT TIPPING CRANE-BOOM FOR WORKSHOP MRS-ARM |
| CN114348887A (en) * | 2022-03-21 | 2022-04-15 | 杭州杰牌传动科技有限公司 | Intelligent monitoring and early warning system and method based on tower crane rotation action model |
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