KR20150075534A

KR20150075534A - Hoist apparatus for monitoring of connection status and hoist method

Info

Publication number: KR20150075534A
Application number: KR1020130163586A
Authority: KR
Inventors: 김영균
Original assignee: 주식회사 포스코
Priority date: 2013-12-26
Filing date: 2013-12-26
Publication date: 2015-07-06

Abstract

To a hoisting device and hoisting method having a fastening state detection function capable of detecting in real time the connection state between the hoisting device and the container from the start of hoisting of the container to the hoisting completion.
A hoisting device having a fastening state detecting function according to the present invention is a device for hoisting a container provided with a pair of trunnies on both sides facing each other, wherein the first fastening means and the second fastening means fastened to the pair of trunnions, respectively, A first driving means and a second driving means for lifting and lowering the first fixing means and the second fixing means, respectively, and a second driving means for driving the first driving means and the second driving means, And a controller for comparing the load received from the sensing means and the second sensing means and the first sensing means and the second sensing means to determine the state of engagement of the pair of trunnions with the first and second fixing means .
Further, the hoisting method of the present invention is a hoisting method for hoisting a container provided with a pair of trunnies on both sides facing each other, wherein the load applied to the pair of trunnions is measured and compared in real time, And the state of the user.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hoisting apparatus and a hoisting apparatus having a fastening state detecting function,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hoisting device having a fastening state detecting function and a hoisting method. More particularly, the present invention relates to a hoisting device having a fastening state detecting function capable of detecting a connection state between a hoisting device and a container, Device and hoisting method.

Generally, a truck equipped with wheels or wheels is used to move a heavy container. If the starting and arriving locations of the container are not on the same line and there is a height difference, a hoisting device such as a crane or a hoist is used.

In order to use such a hoisting device, basically, a trunnion container for fastening a hook of a hoisting device must be provided. In order to stably hoist a hoist, a pair of hooks and a pair of trunnions are provided and fastened. do.

However, if the fastening state of the hook and the trunnion is not firm, the container may fall in the middle of hoisting the container, or the contents stored in the container may flood to the outside.

Hereinafter, a container (also referred to as a ladle) widely used in a steel factory is described as a representative example for convenience of explanation.

The container is used to supply the produced dross to the converter. The dross is charged into the container, and then the container is moved to the top of the converter using the hoisting device.

As shown in FIG. 1, a pair of trunnions 20 are provided on both sides of the container. As the hook 210 of the hoisting device and the trunnion 20 are fastened, 100) will rise and fall. The hook 210 is provided at an end of the wire 220 wound around the drum 40 so that the drum 40 rotates and the wire 220 is lowered toward the ground .

The worker can hardly approach the periphery of the container 100 due to the characteristics of the working environment for handling the high-temperature molten steel, so that the worker can visually check the fastening state of the hook 210 and the trunnion 20 in a separately installed cab. However, since the distance between the cabin and the cabin 100 is considerable and the cabin is located higher than the container 100, it is difficult to visually check the state of engagement between the hook 210 and the trunnion 20, There are many difficulties.

Further, there is a problem that the operator's field of view is limited due to smoke, heat, and surrounding facilities generated in the molten steel, so that only the approximate state is checked, and the container 100 is raised and lowered.

However, when the container 100 is moved only in the eyes of the operator, the hoisting device operates in a state where only one of the pair of hooks 210 to be fastened to both sides of the container 100 is fastened, and the pair of hooks 210 The container 100 may be lifted and lowered in a state in which the container 100 is not firmly fastened to the container body 100. The vibration and shock generated when the container 100 is lifted and lowered even when the hook 210 and the trunnion 20 are normally fastened, The fastening state of the hook 210 and the trunnion 20 may be slightly deteriorated.

When such a situation occurs when the container 100 is raised or lowered, the trunnion 20 and the hook 210 of the container 100 that have been lifted or lowered separate from each other, causing a large accident that the container 100 falls, Not only threatens the safety of the equipment but also damages the peripheral equipment and stops the production process.

A method for solving such a problem is specifically known in the conventional "ladle and hook automatic monitoring system (registered patent 10-1184410)" and "hook trunion fastening detection apparatus (patent 10-0526136)".

In the conventional "ladle and hook automatic monitoring system (patent registration No. 10-1184410)", a ladle hook automatic monitoring system for automatically monitoring the movement of the ladle of the molten steel transportation ladder and the hook of the crane for raising and lowering the ladle was proposed.

The ladle hook automatic surveillance system includes a first beam output unit for outputting a first beam to indicate a first position on the bogie and a second beam output unit for displaying a second position spaced apart from the first position in the height direction of the bogie, A camera for acquiring an image in which the first beam and the second beam are displayed, and a controller for detecting the shape of the first beam and the second beam in the image and causing the ladle and the ladder on the banner to ascend and descend A control unit for determining a state of engagement between hooks of the crane and a position of the ladle and the hook, and an output unit connected to the control unit and outputting information on the state of the engagement and the position of the ladle and the hook.

Further, in the conventional "hook trunion fastening detection device (Patent No. 10-0526136) ", a sensing bellows sensing device in which a crane hook is fastened to a trunnion is proposed.

The trunnion fastening detecting device of the hook includes a distance detecting unit for detecting a first distance and a second distance, an image acquiring unit for acquiring the fastening state of the hook and the trunnion as an image, A comparison unit comparing an image pattern of the hooked state of the extracted hook and trunnion with a similarity degree of a predetermined reference image pattern; And a second judging unit for judging whether or not the fastening improperly fastened according to the deviation value of the second distance.

However, such conventional ladle and hook automatic monitoring systems (registered patent No. 10-1184410) and hook trunion fastening detection apparatuses (Patent Literature 10-0526136) are capable of obtaining a beam or an image at a long distance, It is impossible to obtain accurate data in the facilities disposed around the ladle and smoke or heat generated in the ladle (in particular, in the case of winter, the greatest amount is generated), and the change in the state of engagement There is a problem that can not be detected.

Korean Patent No. 10-1184410 (September 13, 2012) Korean Patent No. 10-0526136 (October 27, 2005)

SUMMARY OF THE INVENTION [0008] In order to solve the problems of the prior art, it is an object of the present invention to provide a hoisting device and a hoisting method having a fastening state detecting function capable of detecting the connection state between the hoisting device and the container in real time, have.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided an apparatus for hoisting a container having a pair of trunnions on opposite sides of a trunnion, A first driving means and a second driving means for raising and lowering the first fixing means and the second fixing means, respectively, and a second driving means for driving the first driving means and the second driving means The first sensing means and the second sensing means for measuring the load respectively and the load received from the first sensing means and the second sensing means are compared with each other, and the load of the pair of trunnions, the first fixing means and the second fixing means And a control unit for determining a fastened state.

The first driving means and the second driving means include a rotary shaft extending through both ends of the sheave and passing through the sheave so that the sheave is rotatable and a pair of fixed frames respectively provided at both ends of the rotary shaft, Wherein the first sensing means and the second sensing means comprise a support frame which is provided in contact with the lower surface of the pair of fixed frames to support the fixed frame, And a load cell for measuring a load of the fixing means.

The plurality of load cells are disposed directly below the pair of fixed frames.

And the load cell is disposed at the same distance apart from the pair of fixed frames immediately below.

Wherein the controller is further configured to determine the position of the hook by calculating the winding or winding length of the wire after receiving the rotation number from the encoder, And stopping the rotation of the drum and the sheave when the positions of the trunnions are the same.

The control unit compares the loads received from the load cells of the first sensing unit and the second sensing unit, and stops the rotation of the drum and the sheave when the difference is equal to or greater than a reference value.

The control unit compares the loads transmitted from the load cells of the first sensing unit and the second sensing unit and stops the rotation of the drum and the sheave when the difference is maintained for a predetermined time or longer in a state where the difference is equal to or greater than a reference value.

On the other hand, a hoisting method according to the present invention is a hoisting method for hoisting a container provided with a pair of trunnies on both sides facing each other, wherein the load applied to the pair of trunnions is measured and compared in real time, And the hoisting condition is grasped.

And stopping the hoisting of the container when a difference in load applied to each of the pair of trunnions is equal to or greater than a pre-input value.

And stopping the hoisting of the container when the load difference applied to the pair of trunnions is equal to or greater than a pre-input value and is maintained for a predetermined time or more.

The present invention has the following various effects.

First, the present invention can prevent an accident that the ladle is released and falls to the ground.

Second, the present invention can secure the safety of the operator.

Third, the present invention can prevent the surrounding facilities from being damaged.

Fourth, the present invention can prevent molten steel contained in the ladle from leaking out.

1 is a view showing a state where a trunnion of a container and a hook are engaged,
Figure 2 schematically shows a hoisting device according to the invention,
3 is a side view of the driving means and sensing means according to the invention,
4 is a plan view showing the driving means and the sensing means according to the present invention,
5 is a front view showing the driving means and the sensing means according to the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings, and the same reference numerals will be applied to the constituent elements described in the background art unless otherwise specified.

The description of the hoisting device and the hoisting method having the fastening state detecting function of the present invention described below is a preferred embodiment of the present invention and is not limited to the embodiments but can be implemented in various forms.

As shown in FIG. 1, a hoisting apparatus having a fastening state detecting function according to an embodiment of the present invention for hoisting a container 100 having a pair of trunnions 20 on opposite sides thereof, The first fixing means 200 and the second fixing means 250, the first driving means 300 and the second driving means 350, the first sensing means 400 and the second sensing means 450, (Not shown).

The first fixing means 200 and the second fixing means 250 are fastened to a pair of trunnions 20 provided on both sides of the container 100 so that the container 100 can be raised and lowered, 210 and a wire 220.

The hook 210 is directly fastened to the trunnion 20, and one end of the wire 220 is connected to the end of the hook 210. The other end of the wire 220 is fixed to a drum 40 which is separately provided to be rotatable. As shown in FIG. 2, the drums 40 are provided as a pair so that the wires of the first fixing means 200 220 and the wires 220 of the second fixing means 250, respectively.

3 and 4, the first driving unit 300 and the second driving unit 350 are connected to the first fixing unit 200 and the second fixing unit 250, respectively, A sheave 310, a rotating shaft 320, and a pair of fixed frames 330.

The sheave 310 is wound around or wound around a wire 220 extending from the drum 40 by being positioned in proximity to the drum 40. The rotary shaft 320 is protruded through both ends of the rotary shaft 320 at its center. A pair of fixed frames 330 are fastened to both ends of the rotary shaft 320, and a lower end of the fixed frame 330 is firmly fixed to the ground.

The first sensing means 400 and the second sensing means 450 measure the load applied to the first driving means 300 and the second driving means 350 respectively and the supporting frame 420 and the load cell 410 ).

5, the support frame 420 is disposed in contact with the lower surface of the pair of fixed frames 330 to firmly support the fixed frame 330, and is positioned between the ground and the fixed frame 330 do. The support frame 420 is provided with a load cell 410 for measuring the loads of the driving means and the fixing means. It is preferable that a plurality of the load cells 410 are disposed directly below the pair of fixed frames 330 At this time, the load cell 410 may be provided on the surface of the support frame 420, but it is preferable that an insertion space is formed inside the support frame 420 and fixed therein.

It is also possible that the load cells 410 are spaced apart from each other by a predetermined distance immediately below the pair of fixed frames 330.

That is, since the lower ends of the pair of fixed frames 330 spaced apart from each other and the support frame 420 composed of one body are in contact with each other, a load applied to the fixed frame 330 is transmitted to the upper surface of the support frame 420 Which is in contact with the lower end of the fixed frame 330.

Therefore, it is possible to maximize the reliability of the load measured by disposing the plurality of load cells 410 at a predetermined distance from the pair of fixed frames 330.

In the present embodiment, a plurality of load cells 410 are positioned directly below the fixed frame 330, but it is also possible to uniformly distribute the load cells 410 over the entire area of the support frame 420, depending on the circumstances to which the present invention is applied.

In the present embodiment, a pair of fixed frames 330 are fixed using one support frame 420, but a pair of fixed frames 330 are fixed It is also possible to do. However, in this case, providing a plurality of load cells 410 in each support frame 420 is a method of increasing the reliability of the measured load.

The control unit (not shown) includes a first fixing unit 200 and a second fixing unit 200 which are respectively coupled to the pair of trunnions 20 by comparing the loads received from the first sensing unit 400 and the second sensing unit 450, 2 load is measured by comparing the load transmitted from the load cell 410 of the first sensing unit 400 and the second sensing unit 450 by determining the fastening state of the fastening unit 250. If the difference is greater than or equal to the reference value And functions to stop the rotation of the drum 40 and the sheave 310. [

It is also possible to immediately stop the rotation of the drum 40 and the sheave 310 when the load difference between the first sensing means 400 and the second sensing means 450 is equal to or greater than the reference input value, It is also possible to stop the rotation of the drum 40 and the sheave 310 when the temperature is maintained above the predetermined time.

That is, the ladle, which is coupled by the first fixing means 200 and the second fixing means 250 and ascending and descending, may generate minute vibration and impact due to the drum 40, the sheave 310, Such a shock may cause the container 100 to tilt to one side.

When such a case occurs, a phenomenon occurs in which the raw material contained in the container 100 is tilted in a direction in which the raw material is tilted, and thus the load cell 410 of the first sensing means 400 and the load cell 410 of the second sensing means 450 410). &Lt; / RTI >

However, if the load difference is considerably larger than the reference value, it is necessary to immediately stop the elevation, but if the moment is finely exceeded, stopping the elevation every time will result in a decrease in the production speed.

Therefore, if a certain error value is inputted in advance and the load difference is maintained over a certain time within the error range, the drum 40 and the sheave 310 are immediately stopped. Otherwise, It is desirable to continue the elevating operation.

The present invention preferably includes an encoder (not shown) for measuring the number of revolutions of the drum 40.

That is, when the hook 210 is lowered to fasten the hook 210 and the trunnion 20, the control unit (not shown) receives the rotation number of the drum 40 measured by an encoder (not shown) The position of the hook 210 can be grasped by calculating the length of the wire 220 to be wound or the position of the hook 210 when the position of the hook 210 is determined to be the same as the position of the trunnion 20 spaced from the ground, 40 and the sheave 310 is stopped, the hook 210 can be prevented from descending below the height of the trunnion 20. [

At this time, since the height of the trunnion 20 is not a predetermined value, it is preferable that the height of the trunnion 20 is measured in advance according to the situation in which the present invention is applied and input to the control unit (not shown).

Hereinafter, the operation of the present invention for detecting the fastening state of the trunnion 20, the first fastening means 200 and the second fastening means 250 will be described with reference to FIGS. 2 and 5. FIG.

The drum 40 is rotated using a control unit (not shown) to fasten the pair of trunnions 20 and the hooks 210 of the first fixing unit 200 and the hooks 210 of the second fixing unit 250. [ And the sheave 310 are rotated.

When the drum 40 and the sheave 310 start to rotate in either direction, the wire 220 wound around the drum 40 and the sheave 310 is pulled out so that the hook 210 descends toward the ground .

At this time, the number of revolutions of the rotating drum 40 is measured by an encoder (not shown) and transferred to a control unit (not shown). In a control unit (not shown) After calculating the length, the current position of the hook 210 is grasped.

When the hook 210 descends and is lowered to the same position as the trunnion 20, the control unit (not shown) stops the rotation of the drum 40 and the sheave 310. When the hook 210 and the trunnion 20 are fastened together, the load is measured by the load cell 410 of the first fixing means 200 and the load cell 410 of the second fixing means 250, The drum 40 and the sheave 310 start to rotate in the opposite direction to the first direction.

The wire 220 is wound by the sheave 310 and the drum 40 so that the container 100 fastened to the hook 210 is also raised and lowered. At this time, the load cell 410 measures the load of the driving means and the wire 220 in real time, and continuously transmits the measured value to the control unit (not shown).

When vibrations and shocks are generated during the lifting and lowering of the container 100 and the difference between the load measured at the load cell 410 of the first sensing unit 400 and the load cell 410 of the second sensing unit 450 becomes equal to or greater than the reference value , The time when the state is maintained is measured and the rotation of the drum 40 and the sheave 310 is stopped as soon as the time reaches the pre-input time.

If an abnormality occurs in any one of the first fixing means 200 or the second fixing means 250, a change in the load value measured by the load cell 410 occurs immediately, The rotation of the drum 40 and the sheave 310 is stopped to prevent the container 100 from falling off the hook 210 and falling down.

The hoisting method of the present invention for hoisting up the container 100 provided with the pair of trunnions 20 on both sides facing each other will be described below.

The loads applied to the pair of trunnions 20 provided on both sides of the container 100 are measured in real time in order to grasp in real time the state of the container 100 being hoisted while hoisting the container 100.

By thus comparing the loads measured in the pair of trunnions 20, it is possible to grasp the hoisting state of the container 100. That is, when the measured loads are compared, if there is no difference, the raw materials contained in the container 100 are stably distributed in the container 100, and if the compared values show a large difference, ), Indicating that the center of gravity is deviated to one side.

At this time, if the load difference applied to each of the pair of trunnions 20 is equal to or greater than a predetermined reference value, hoisting of the container 100 is stopped, thereby preventing a safety accident.

It is also possible to stop the hoisting of the container 100 if the load difference applied to each of the pair of trunnions 20 is maintained equal to or higher than the pre-input value for a predetermined period of time.

In other words, it is possible to immediately stop the hoisting operation when the load difference is equal to or larger than the reference input value. However, considering that the container 100 is shaken finely, when the load difference is maintained over the predetermined input time, By stopping the hoisting operation, the hoisting operation can proceed smoothly.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. It will also be appreciated that many modifications and variations will be apparent to those skilled in the art without departing from the scope of the present invention.

20: trunnion 100: container
200: first fixing means 210: hook
220: wire 300: first driving means
310: Sheave 320:
330: fixed frame 400: first sensing means
410: load cell 420: support frame

Claims

An apparatus for hoisting a container provided with a pair of trunnies on both sides facing each other,
First fixing means and second fixing means respectively fastened to the pair of trunnions;
First driving means and second driving means for raising and lowering the first fixing means and the second fixing means, respectively;
First sensing means and second sensing means for respectively measuring a load applied to the first driving means and the second driving means; And
And a control unit for comparing the load received from the first sensing unit and the second sensing unit to determine a state of engagement between the pair of trunnions, the first fixing unit and the second fixing unit, Lt; / RTI >

The method according to claim 1,
Further comprising a pair of drums connected to the first fixing means and the second fixing means, respectively,
Wherein the first fixing means and the second fixing means comprise a hook which is engaged with the trunnion and a wire which connects the hook and the drum,
Wherein the first driving means and the second driving means comprise a sheave which is located close to the drum and is rotatably provided to wind or unwind the wire extending from the drum, .

The method of claim 2,
The first driving means and the second driving means include a rotary shaft extending through both ends of the sheave and passing through the sheave so that the sheave is rotatable and a pair of fixed frames respectively provided at both ends of the rotary shaft, Further comprising:
Wherein the first sensing means and the second sensing means comprise a support frame which is provided in contact with the lower surface of the pair of fixed frames and which supports the fixed frame and a support frame provided on the support frame, A hoisting device having a fastening state sensing function, including a load cell to be measured.

The method of claim 3,
Wherein the load cells are provided in a plurality of the load cells and are disposed directly below the pair of fixed frames.

The method of claim 4,
Characterized in that the load cell is disposed at equal intervals immediately below the pair of fixed frames.

The method of claim 3,
Further comprising an encoder for measuring the number of revolutions of the drum,
Wherein the control unit determines the position of the hook by calculating the winding or winding length of the wire by receiving the number of revolutions from the encoder and if the position of the hook and the position of the trunnion are the same, Wherein said stopping means is a stopping means for stopping said stopping means.

The method of claim 3,
Wherein the control unit compares the loads transmitted from the load cells of the first sensing unit and the second sensing unit and stops the rotation of the drum and the sheave when the difference is greater than or equal to a reference value. Device.

The method of claim 3,
Wherein the control unit compares the loads transmitted from the load cells of the first sensing unit and the second sensing unit and stops the rotation of the drum and the sheave when the difference is maintained for a predetermined time or longer in a state where the difference is equal to or greater than a reference value. A hoisting device having a status detection function.

A method for hoisting a container provided with a pair of trunnies on both sides facing each other,
Characterized in that the load applied to the pair of trunnions is measured and compared in real time to grasp the hoisting state of the container

The method of claim 9,
Characterized in that when the difference in load applied to each of the pair of trunnions is equal to or greater than a pre-input value, hoisting of the container is stopped

The method of claim 9,
Wherein when the load difference applied to the pair of trunnions is equal to or greater than a pre-set value and the load difference is maintained for a predetermined time or more, the container is stopped.