CN2619920Y

CN2619920Y - Crane stall protector

Info

Publication number: CN2619920Y
Application number: CN 03227441
Authority: CN
Inventors: 胡晓林; 孙国荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-04-21
Filing date: 2003-04-21
Publication date: 2004-06-09
Anticipated expiration: 2013-04-21

Abstract

The utility model relates to a speed loss protecting device, which is a safety protecting device used on the lifting mechanism of a hoister. The utility model is characterized in that: the utility model comprises a safety brake and a speed testing device that can detect the rotating speed of the high speed shaft of a speed reducer. According to the rotating speed of the high speed shaft of the speed reducer, the utility model judges whether the connection between the speed reducer and a motor is separated, so as to avoid a crane hook from falling down and avoid the speed loss situation from happening, as well as to ensure the safety of the device and the staff. The utility model has the advantages of simple and reliable structure, easy and convenient application and maintenance, convenient for innovation to the old type hoister; and thus is suitable for the hoister with high importance and reliability.

Description

Hoisting crane stall protection device

The utility model relates to a kind of stall safety guard of hoisting crane.

Because crane hoisting mechanism retarder high speed shaft exists crackle or other defective, hoisting crane is in operational process, the retarder high speed shaft may occur ruptures suddenly and (once occurred in Hunan Province Da Yuan crosses the lifting mechanism of 200t dam crest door machine of key water control project, do not lift by crane any object at that time on the suspension hook, and device damage and personal casualty do not appear) or other reason make the dockingundocking of electrical motor and retarder, service brake is ineffective, cause load hook stall to descend fast, and cause the damage of lifting appliance and the grave accident of personal casualty with the speed of free-falling body.

The purpose of this utility model is to avoid the generation of above-mentioned accident and a kind of stall safety guard of providing.

The purpose of this utility model can reach by the following technical programs: the other end at retarder increases a brake wheel, an one cover sure brake and a cover speed measuring device are installed on brake wheel, when speed measuring device degree of testing the speed during greater than the high operation speed of electrical motor, promptly cut off the crane hoisting mechanism power supply, the sure brake braking, thereby avoid lifting mechanism stall, prevent that suspension hook from falling.

The utility model will be further described below by accompanying drawing:

Fig. 1 is the structural representation that sure brake and tachogenerator are installed in crane hoisting mechanism;

Fig. 2 is that tachogenerator concerns scheme drawing with the controller that tests the speed;

Fig. 3 is that PLC concerns scheme drawing in tachogenerator and the hoisting crane electrical equipment.

With reference to Fig. 1, Fig. 2 and Fig. 3, the utility model increases a brake wheel 5, sure brake 6 and one near switch 7 on the high speed shaft of crane hoisting mechanism retarder 4.Concrete method of attachment is: electrical motor 1 is connected with the high speed shaft of retarder 4 by band brake wheel coupler 2, and a service brake 3 is installed on brake wheel coupler 2; The other end at retarder 4 high speed shafts is equipped with a brake wheel 5, and a sure brake 6 is installed on brake wheel 5; A tachogenerator 7 is installed in the outside at brake wheel 5.Tachogenerator 7 be electrically connected two kinds of forms: a kind of is tachogenerator 7 and test the speed controller 2-1, and the controller 2-1 that tests the speed is connected with the hoisting crane main control loop again; Another kind is that tachogenerator 7 directly is connected with the PLC 3-1 of hoisting crane electrical equipment, is connected to the hoisting crane main control loop then.

Working process of the present utility model is: during the lifting mechanism normal operation; the speed of retarder 4 high speed shafts that controller 2-1 or PLC 3-1 surveyed of testing the speed is exactly the rotating speed of electrical motor 1; this rotating speed is smaller or equal to electrical motor 1 high workload rotating speed; testing the speed controller 2-1 or PLC 3-1 this moment can be to hoisting crane electric loop transmission shutdown signal, and at this moment lifting mechanism can normally move.When the dockingundocking of electrical motor 1 and retarder 4 high speed shafts; service brake 3 is ineffective; the crane hoisting mechanism get out of hand; load hook can begin quick decline; when the rotating speed of measured retarder 4 high speed shafts of controller 2-1 or PLC 3-1 that test the speed during greater than the high workload rotating speed (this tachometer value can be set) of electrical motor 1; testing the speed controller 2-1 or PLC 3-1 will be to hoisting crane main control loop transmission shutdown signal; cut off the lifting mechanism power supply immediately; sure brake 6 brakings, thus prevent that load hook from falling.

The utlity model has following advantage and good effect: (one) provides crane losing A kind of safety guard under the speed state can be avoided the generation of stall accident, assurance equipment Safety with personnel; (2) this apparatus structure is simple and reliable, expense is low, convenient for installation and maintenance; (3) convenient transformation to old crane.

Claims

1, a kind of hoisting crane stall safety guard is characterized in that in a side of Hoist Mechanism [4] high speed shaft a brake wheel [5] being installed, and goes up an installation sure brake [6] at brake wheel [5]; A near tachogenerator [7] that is installed in the safety arrestment wheel [5]; sensor [7] sends a signal to the controller that tests the speed [2-1]; the controller [2-1] that tests the speed is connected with the hoisting crane main control loop; when the controller that tests the speed [2-1] institute degree of testing the speed sends shutdown signal to the hoisting crane main control loop during greater than lifting mechanism electrical motor [1] maximum functional rotating speed; cut off the lifting mechanism power supply; sure brake [6] braking prevents that suspension hook from falling, to reach the stall safety guard-safeguard.

2, hoisting crane stall safety guard as claimed in claim 1 is characterized in that tachogenerator [7] sends a signal to the controller that tests the speed [2-1], and the controller that tests the speed [2-1] sends a signal to the hoisting crane main control loop and is used for the stall safety guard-safeguard.

3, as claim 1 and 2 described hoisting crane stall safety guards, it is characterized in that tachogenerator [7] directly sends a signal to the PLC[3-1 in the hoisting crane electrical equipment] be used for the stall safety guard-safeguard.