KR19980020509A - Slip prevention device and method of crane - Google Patents

Abstract

The present invention relates to an apparatus and method for preventing slip of a crane.

The present invention is a crane body (1), a speed reducer (2) installed on the top of the crane body driven by a hoist motor, wire drums (3a to 3d) wires are installed on both sides of the speed reducer, and the speed reducer Hoist motors 8a to 8d to drive, Hoist brakes 9a to 9d to brake the reducer, Wire drums 3a to 3d which rotate by the reducer 2 and hoist the bucket 7 and And auxiliary decelerators 14a and 14b and pignon interlocked with the wire drum, and proximity switches 20a and 20b for generating pulses according to the rotation of the pignan 15 and providing them to the program logic controller. And a program logic controller 30 for controlling the operation of each device and controlling the emergency hydraulic brakes 11a to 11d at the time of emergency detection, and then operating the emergency brake after detecting the failure of the hoist brake as a braking device. Of the crane Phuket relates to an apparatus and a method of slip crane to prevent accidents resulting from the fall down in advance.

Description

Slip prevention device and method of crane

The present invention relates to an apparatus and a method for preventing a slip of a crane (SLIP), in particular, in a bucket crane (BUCKET CRANE), by simply implementing a slip prevention device of the wire drum due to the failure of the brake brake hoisting device, The present invention relates to an anti-slip device and a method for maintaining a maintenance cost and facilitating installation and maintenance.

1 (a) and (b) are a front view and a plan view of a general bucket crane. Referring to FIG. 1, a wire drum 3a wound with wires on both sides of the reducer 2 installed on the crane body 1 is illustrated. 3d), hoist motors 8a to 8d and hoist brakes 9a to 9d are provided, and the four hoist motors 8a to 8d include one planetary gear reducer (2). By rotating the wire drums 3a to 3d, the bucket 7 serving as the load is hoisted. There is a disk 16 between the speed reducer 2 and the hoist motors 8a to 8d, which holds the hoist brakes 9a to 9d and stops it.

In the above bucket crane device, when the adsorption force is reduced due to a brake pater defect, rainwater or foreign matter penetration, etc., the bucket crane slides under the force of the load and a safety accident occurs accordingly.

In order to prevent such a safety accident, conventionally, a tachometer (TACHO METER) is attached to the rotating shaft, the value is converted into an electrical signal, and then transmitted to the program logic controller, which is a signal from the techometer. On the basis of this, the slip is recognized and the emergency hydraulic brake is operated to prevent the slip.

However, in the case of using a conventional tachometer, the installation cost is greatly increased due to the tachometer and its signal converter, and is difficult to maintain and repair, and is limited to constant speed control, and is used only for direct current (DC) control. There are various problems, such as limited use.

The present invention has been made to solve the above problems and to achieve an improvement.

Accordingly, an object of the present invention is to implement a slip prevention device of the wire drum due to the failure of the brake brake hoist brake in the bucket crane, the installation cost and maintenance cost is low, and also the installation and maintenance It is to provide an apparatus and method for preventing slip of a crane to facilitate maintenance.

Another object of the present invention in the bucket crane (bucket crane), by preventing the sliding of the wire drum due to the failure of the brake brake hoist brake, the safety of the crane bucket caused by the sliding of the wire drum falling down It is to provide an anti-slip device and method for preventing the accident in advance.

As a technical means for achieving the above object of the present invention, the crane anti-slip device of the present invention is a crane main body, a gear reducer installed on the top of the crane body driven by a hoist motor, the reducer is installed on both sides of the wire In the anti-slip device of the crane comprising: a wire drum wound around; a hoist motor for driving the speed reducer; a hoist brake for braking the speed reducer; and a wire drum rotating by the speed reducer to hoist the bucket. Auxiliary reducer and pignan interlocked with wire drum; Proximity switch for generating a pulse according to the rotation of the pignan provided to the program logic controller; Emergency operation of the hydraulic brake when the operation of each device including the crane operation and the hoist brake and the emergency hydraulic brake is input, and the pulse is input from the proximity switch more than a predetermined number in the non-driven control state of each device. And a program logic controller for outputting an operation signal.

In addition, as another technical means for achieving the above technical problem, the crane slip prevention method of the present invention is installed on the crane body, the crane main body is installed on the top of the crane body driven by the hoist motor, and installed on both sides of the speed reducer A wire drum wound around the wire, a hoist motor for driving the reducer, a hoist brake for braking the reducer, a wire drum rotating by the reducer and hoisting a bucket, and an auxiliary reducer interlocking with the wire drum. And a pignon, a proximity switch that generates a pulse according to the rotation of the pignan and provides it to the program logic controller, and a program logic to control the operation of each device and to control the emergency hydraulic brake during emergency detection. In the method for preventing slip of a crane including a controller, a crane operation command command If it is determined whether the operation command into a first step of controlling the normal operation of the crane; A second step of determining whether a pulse input from a proximity switch is greater than or equal to a preset number according to the sliding of the wire drum in a crane non-driven state without a crane operation command command in the first step; And a third step of preventing the sliding of the wire drum by operating the emergency hydraulic brake when the number of pulses from the proximity switch is greater than the number set in advance in the second step.

1 (a) and (b) are a front view and a plan view of a general bucket crane.

2 is a configuration diagram of a slip prevention device of a crane according to the present invention.

FIG. 3 is a detail view of the pigg (pig non) shown in FIG.

4 is a logic circuit diagram of the program logic controller 30 shown in FIG.

5 is a timing chart for a signal according to the present invention.

6 is a flowchart showing a method of preventing slip of a crane according to the present invention.

Explanation of symbols on the main parts of the drawings

1: crane body 2: reducer

3a to 3d: wire drum 4: traveling device

5 vertical beam 6 horizontal beam

7: Bucket 8a-8d: Hoist motor

9a to 9d: Hoist brake 11a to 11d: Emergency hydraulic brake

12a-12d: Brake limit switch 13a, 13b: Bearing

15a, 15b: Pininan 14a, 14b: auxiliary reducer

16: disk 20a, 20b: proximity switch

30: program logic controller 31: first logic operation unit

32: second logical operation unit 33: coefficient / comparison unit

34: control unit

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the slip prevention device of the crane according to the present invention will be described. In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.

FIG. 2 is a configuration diagram of a crane slip prevention apparatus according to the present invention. FIG. 3 is a detailed view of pig non shown in FIG. 2, and FIG. 4 is a program logic controller shown in FIG. 30) Internal logic circuit diagram.

2, 3 and 4, the crane slip prevention device according to the present invention is a crane body (1), a reduction gear (2) installed on the crane body is driven by a hoist motor, Wire drums 3a to 3d provided on both sides of the speed reducer and wound with wires, hoist motors 8a to 8d for driving the speed reducer, hoist brakes 9a to 9d for braking the speed reducer, and the speed reducer ( 2) wire drums 3a to 3d which rotate by 2) and hoist the bucket 7, auxiliary reduction gears 14a and 14b and pignon that interlock with the wire drum, and the pignan 15 Each device including proximity switches 20a and 20b for generating a pulse according to the rotation of the motor and providing it to the program logic controller, and the crane operation, the hoist brakes 9a to 9d, and the emergency hydraulic brakes 11a to 11d. In the non-driven control state of each device Constitute a group proximity switch program logic controller 30 which outputs an operation signal to emergency brake hydraulic pressure (11a~11d) when a pulse is input to more than the number set in advance from (20a, 20b).

The program logic controller 30 includes a first logic operation unit 31 for logically multiplying a signal obtained by inverting an operation signal of its own hoist brakes 9a to 9d, and a signal from the proximity switches 20a and 20b, and A second logical operation unit 32 which logically multiplies and outputs the signal from the limit switches 12a to 12d, the reset signal by the external reset button, the operation signal of the hoist brakes 9a to 9d, and the hoisting signal, and the second When the signal from the logic operation unit 32 is input and the signal is not a reset signal, the pulse signal of the first logic operation unit 31 is counted to generate a slip signal when a pulse is input at a predetermined number or more. And a control part 34 for outputting an emergency stop control signal to the emergency hydraulic brake 11b when the coefficient / comparing part 33 to be output is applied and the slip signal from the coefficient / comparing part 33 is outputted.

Operation according to the device of the present invention configured as described above will be described in detail below based on the accompanying drawings.

Referring to FIGS. 2 to 6, the present invention will be described. A process of detecting a slip phenomenon (sliding phenomenon) in such a crane and preventing it is first performed in a first step (61 to 64). If there is an operation command, the normal operation of the crane is controlled.

Specifically, in FIG. 2, only the hoist motor 8b, the hoist brake 9b and the wire drum 3b are shown in the planetary gear reducer 2, and three units operating in the same manner as the above apparatus are shown. Hoist motors 8a, 8c and 8d, hoist brakes 9a, 9c and 9d and wire drums 3a, 3c and 3d are omitted. 2 is a configuration diagram of a crane slip prevention apparatus according to the present invention. In the program logic controller 30 shown in FIG. 2, when there is an operation signal, that is, a crane operation signal signal, the crane is operated normally and the hoist When the motor 8b is driven, the hoist brake 9b holding the disc opens at this time, and the wire drum 3b rotates by moving the reducer 2 when the sensing limit switch 12b is touched. Accordingly, the bucket is hoisted by the wire wound and wound around the wire drum 3b. Meanwhile, the pignan 15a interlocks with the bearing 13a and the auxiliary reducer 14a connected to the rotation shaft of the wire drum.

Next, in the second step 65, it is determined whether the pulses inputted from the proximity switches 20a and 20b are greater than or equal to a preset number in the non-driven state of the crane without the crane operation command command in the first steps 61 to 64. do.

Specifically, referring to FIG. 4, first, when there is no operation command in the program logic controller, the hoist brake of the crane operation command command signal as shown in FIG. If the operation command (-F12.6) is low and the crane is abnormal in this state, such as a hoist brake abnormality, that is, slippage of the wire drum 3b occurs, As the wire drum 3b shown rotates, the peak column 11 interlocked with the wire drum 3 rotates through the bearing 13b and the auxiliary reduction gear 14b, and thus the pig egg shown in FIG. The protruding portion and the non-protruding portion formed in (15) alternately approach the proximity switch 20a so that the pulses CP are continuously generated in the proximity switch 20a as shown in FIG.

In this situation, the first logic operation unit 31, which is the questionnaire shown in FIG. 4, logically multiplies the inverted signal of the signal (-F12.6) by the signal of the proximity switch 20a to FIG. The pulse train CP from the proximity switch shown in Fig. 8) is output.

Finally, in the third step 66, when the number of pulses from the proximity switches 20a and 20b is larger than the number previously set in the second step 65, the emergency hydraulic brakes 11a to 11d are operated to operate. The braking force of the emergency hydraulic brake 11b prevents the sliding of the wire drum 3b.

In detail, referring to FIG. 4, when the count / comparator 33 counts the pulse of the first logical operation unit 31 so that the counting value is larger than the preset value KC002, When KC002 is set to 2, when the number of input pulses is 2, the coefficient / comparator 33 determines that the wire drum 3b is slip and outputs a slip signal F42.4 to the output terminal Q. do. Of course, the OR / second logical operation unit 32, which is an OR gate, resets the coefficient / comparator 33 when there is an internal reset signal or an external reset signal. However, the state of the coefficient / comparator 33 that outputs the slip signal in this way is output. Is a logical multiplication of the signal from the limit switch (12a to 12d), the reset signal by the external reset button, the operation signal of the hoist brakes (9a to 9d) and the hoisting signal to the coefficient / comparison unit 33, This output signal is a state in which the count / comparator 33 is not reset when there are no internal and external reset signals. The control unit 34 receiving the slip signal outputs a brake operation signal which is an emergency stop control signal as shown in FIG. 5E to the emergency hydraulic brake 11b. The emergency hydraulic brake (11b) is to prevent the sliding of the wire drum (3b) by the hydraulic braking mechanism by the emergency stop control signal.

According to the present invention as described above, in the bucket crane, by simply implementing the anti-skid device of the wire drum due to the failure of the brake brake, which is a braking device, the installation cost and maintenance cost is low, and also the installation And it is effective to facilitate maintenance, and also, by preventing the slip of the wire drum due to the failure of the brake brake hoist device, it is effective to prevent the safety accident caused by the bucket bucket falling down will be.

The above description is only a description of one embodiment of the present invention, the present invention is capable of various changes and modifications within the scope of the configuration. In addition, it will be readily apparent to those skilled in the art that the slip preventing apparatus and method of the crane is not limited to the above-described embodiment.

Claims (3)

A crane main body 1, a speed reducer 2 mounted on the top of the crane body driven by a hoist motor, wire drums 3a to 3d wound on both sides of the speed reducer, and a hoist for driving the speed reducer; A crane including motors 8a to 8d, hoist brakes 9a to 9d for braking the reducer, and wire drums 3a to 3d which rotate by the reducer 2 and hoist the bucket 7. In the slip prevention device of Auxiliary reduction gears (14a, 14b) and pigg (pig non) interlocked with the wire drum; Proximity switches (20a, 20b) for generating a pulse according to the rotation of the pignan (15) to provide a program logic controller; The operation of each device including the crane operation and the hoist brakes 9a to 9d and the emergency hydraulic brakes 11a to 11d is controlled, and from the proximity switches 20a and 20b in the non-driven control state of each device. And a program logic controller (30) for outputting an operation signal to the emergency hydraulic brakes (11a to 11d) when a pulse is inputted over a predetermined number. The first logic operation unit of claim 1, wherein the program logic controller 30 logically multiplies a signal obtained by inverting an operation signal of its own hoist brakes 9a to 9d and a signal from the proximity switches 20a and 20b. (31); A second logic operation unit 32 for performing a logical AND operation on the signal from the limit switches 12a to 12d, the reset signal by the external reset button, the operation signal of the hoist brakes 9a to 9d, and the hoisting signal; When the signal from the second logical operation unit 32 is input, and if the signal is not a reset signal, the pulse signal of the first logical operation unit 31 is counted and the pulses are input at a predetermined number or more. A coefficient / comparison unit 33 for outputting a slip signal; A control unit 34 outputting an emergency stop control signal to the emergency hydraulic brake when the slip signal from the coefficient / comparator 33 is output; Slip prevention device of the crane, characterized in that consisting of. A crane main body 1, a speed reducer 2 mounted on the top of the crane body driven by a hoist motor, wire drums 3a to 3d wound on both sides of the speed reducer, and a hoist for driving the speed reducer; Motors 8a to 8d, hoist brakes 9a to 9d for braking the reducer, wire drums 3a to 3d rotating by the reducer 2 and hoisting the bucket 7, and the wire Auxiliary decelerators 14a and 14b interlocked with drums and pigg (pig non), and proximity switches 20a and 20b which generate pulses according to rotation of the pignan 15 and provide them to a program logic controller; In the method of preventing the slip of a crane comprising a program logic controller (30) for controlling the operation of the device and at the same time controlling the emergency hydraulic brakes (11a to 11d) during emergency detection. First steps (61 to 64) for judging whether there is a crane operation command instruction and controlling the normal operation of the crane if the operation instruction is received; In the first steps 61 to 64, it is determined whether the pulses input from the proximity switches 20a and 20b are equal to or greater than a preset number according to the sliding of the wire drum 3b in the non-driven state of the crane without the crane operation command command. A second step 65; In the second step 65, if the number of pulses from the proximity switches 20a and 20b is larger than the preset number, the emergency hydraulic brakes 11a to 11d are operated to prevent the wire drum from slipping. 66); Slip prevention method of the crane, characterized in that consisting of.