Forge crane overload servo protection device
A technology of forging cranes and protection devices, which is applied in the direction of cranes, walking bridge cranes, safety devices, etc., can solve the problems of crane steel structure fracture, collapse, crane overload, etc., and achieve the effect of increasing safety and reliability
Active Publication Date: 2008-09-17
CHINA ERZHONG GRP DEYANG HEAVY IND
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Problems solved by technology
When working, the workpiece clamped on the turning machine is hoisted by the forging crane to the working platform of the hydraulic press for forging. When the downforce of the hydraulic press is greater than the rated load of the crane, it can pass through the buffer spring under the fixed pulley block and the hanging plate of the turning machine. However, when the operator makes a mistake, the downward movement of the buffer spring will exceed the downward movement caused by the design load. At this time, the crane will be seriously overloaded, which will cause the steel structure of the crane to break, collapse
Method used
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[0015] Example: As shown in Figures 1 to 3, the forging crane overload follow-up protection device of the present invention is arranged between the motor 101 and the reducer 102, the fixed pulley block frame 1 is supported on the beam of the trolley through the buffer spring, and the fixed pulley block A transmission is provided between the frame 1 and the brake 10 . The buffer spring adopts scroll spring, and the brake 10 adopts electro-hydraulic push rod normally closed brake. The transmission device includes a cantilever 3 with a bumper 4, a link mechanism 7 connected to the bumper 6 and the rocker arm 9, and a connecting block 11 connected to the brake block of the brake 10, which are arranged in sequence in the direction of motion transmission. 7 is supported on the beam by the rotating shaft 8, and the swing arm 9 is fixedly arranged on the rotating shaft 8; the cantilever 3 is arranged on the fixed pulley block frame 1, the bumper 6 corresponds to the position of the bu...
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The invention discloses a following overload protection unit of forging crane used for preventing effectively the serious overload during the hydraulic forging operation, which is characterized in that a frame of fixed pulley block is arranged on the beam of carriage frame by force of buffer springs, a transmission device is arranged between the frame of the fixed pulley block and the brake; when the crane is overload, the displacement of buffer spring can transmit an opposing torque to the brake through the transmission device, the opposing torque is opposite in direction of the braking torque. When the load of the forging crane reach to the specified load, the generated opposing torque can balance out some braking torque of the brake, when reaching to the braking torque required by the specified load, the brake can skid, the load can lower to make the crane unloading. The device can react if the overload condition is occurred by misoperation, so, the device has the advantages of improving the safety and reliability of the forging crane and using comprehensively on the prior forging cranes.
Description
technical field [0001] The invention relates to a crane overload protection device, in particular to a forging crane overload follow-up protection device used in the forging operation of a hydraulic press. Background technique [0002] At present, the safety protection devices for forging cranes used in China to prevent overload are only equipped with spring buffers, and the frame of the fixed pulley block is supported on the beam of the trolley through the buffer springs, which is an effective protection device. When working, the workpiece clamped on the turning machine is hoisted by the forging crane into the working platform of the hydraulic press for forging. When the downforce of the hydraulic press is greater than the rated load of the crane, it can pass the buffer spring under the fixed pulley block and the lifting plate of the turning machine. The downward movement of the buffer spring to avoid the overload of the crane, but when the operator makes mistakes, the down...
Claims
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Login to View More IPC IPC(8): B66C17/12B66C15/00
Inventor 洪盛荣陈远
Owner CHINA ERZHONG GRP DEYANG HEAVY IND