GB1335373A - Tower cranes - Google Patents
Tower cranesInfo
- Publication number
- GB1335373A GB1335373A GB5232770A GB5232770A GB1335373A GB 1335373 A GB1335373 A GB 1335373A GB 5232770 A GB5232770 A GB 5232770A GB 5232770 A GB5232770 A GB 5232770A GB 1335373 A GB1335373 A GB 1335373A
- Authority
- GB
- United Kingdom
- Prior art keywords
- characteristic
- motor
- brake
- excitation
- notching
- 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
Links
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
- B66C23/62—Constructional features or details
- B66C23/84—Slewing gear
-
- 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
- B66C13/30—Circuits for braking, traversing, or slewing motors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C2700/00—Cranes
- B66C2700/08—Electrical assemblies or electrical control devices for cranes, winches, capstans or electrical hoists
- B66C2700/082—Control of the secondary movements, e.g. travelling, slewing, luffing of the jib, changing of the range
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Control And Safety Of Cranes (AREA)
- Stopping Of Electric Motors (AREA)
Abstract
1335373 Control of A.C. motors RICHIER 3 Nov 1970 [3 Nov 1969] 52327/70 Heading H2J The jib of a tower crane is rotated by a wound rotor induction motor 11, Fig. 2, working against an eddy current brake 13 to produce the torque speed curve DEFGHIJKLM, Fig. 3. The motor is supplied via reversing contactors 21, and is controlled from 4-position speed controller 19, which via speed detector 22 sensing rotor voltage controls device 23 which alters the motor torque-speed characteristic by inserting resistors or a thyristor circuit, in its rotor circuit. For motoring notches 1-4 of controller 19, the excitation voltage of the brake 13 is controlled via voltage control contactors 24 and adjustable variable voltage regulator 25 containing thyristors, and for notch 0 via adjustable regulator 28 comprising a network of resistors and capacitors which provides a continuous rate of change of brake excitation voltage, of ramp form to give the braking characteristic C. Actuation of a mechanical locking brake (14), Fig. 1 (not shown) disconnects the excitation from brake (13). Notching up.-For notches 1-4 respectively, in either direction the torque speed characteristic DEFGHIJKLM is obtained as follows: Motor characteristic 1 is combined with brake characteristic A to give operating characteristic 1a; Motor characteristic 1 is combined with brake characteristic B to give operating characteristic 1b; Motor characteristic 1 alone; Motor characteristics 2, 3 with transition from characteristic 2 to 3, performed automatically by the predetermined speed detector 22, or a time delay relay, which removes resistors or thyristors from the rotor circuit. For fast notching up, the brake excitation does not take place, giving characteristic DIJKLM. Notching down reverses the above sequence except that, upon notching from 4 to 3, the motor characteristic changes directly from 3 to 1. Notch 0 gives a ramp excitation of brake 13 via regulator 28 with no motor supply. The mounting of the system in the tower crane is displayed in Fig. 1 (not shown). More than three motor operating characteristics may be used.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR6937787A FR2067426A5 (en) | 1969-11-03 | 1969-11-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1335373A true GB1335373A (en) | 1973-10-24 |
Family
ID=9042529
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5232770A Expired GB1335373A (en) | 1969-11-03 | 1970-11-03 | Tower cranes |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR2067426A5 (en) |
GB (1) | GB1335373A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112811330A (en) * | 2019-11-15 | 2021-05-18 | 湖南沃森电气科技有限公司 | Control method and system for slewing mechanism of tower crane |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2520133A1 (en) * | 1982-01-19 | 1983-07-22 | Potain Sa | EQUIPMENT FOR REDUCING DYNAMIC EFFECTS IN THE ROTATION CONTROL OF A HORIZONTAL ELEMENT OF GREAT INERTIA |
-
1969
- 1969-11-03 FR FR6937787A patent/FR2067426A5/fr not_active Expired
-
1970
- 1970-11-03 GB GB5232770A patent/GB1335373A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112811330A (en) * | 2019-11-15 | 2021-05-18 | 湖南沃森电气科技有限公司 | Control method and system for slewing mechanism of tower crane |
CN112811330B (en) * | 2019-11-15 | 2023-06-23 | 湖南沃森电气科技有限公司 | Control method and system for slewing mechanism of tower crane |
Also Published As
Publication number | Publication date |
---|---|
FR2067426A5 (en) | 1971-08-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed |