JPH09249379A - Hook tip latching detection device and ladle crane on which the detection device is mounted - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hook tip latching detection device which can detect a hook tip latching condition of a ladle crane automatically and perform the correction operation immediately and the ladle crane on which the detection device is mounted. SOLUTION: It is a hook tip latching detection device which is provided with a hook beam and hooks 3 which are suspended at both ends of the hook beam, respectively, and is mounted on a ladle crane which hoists a ladle by applying the hooks on trunnions at both ends of the ladle. It has an inclination meter 13 which is fixed on the hook beam and detects an inclination limit of the hook beam to output a detection signal and controllers 14, 15, 16 which stop the winding up of the ladle crane based on the detection signal and/or inform a driver of an abnormality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hook tip hanging detection device and a ladle crane equipped with the device. More specifically, the present invention includes a hook beam and hooks hung at both ends of the hook beam. The present invention relates to a hook tip hook detection device mounted on a ladle crane that hangs a ladle on trunnions at both ends of the pot and a ladle crane equipped with the device.

[0002]

2. Description of the Related Art In a ladle crane that suspends and conveys hot metal and molten steel (generally referred to as molten metal) at a steelmaking plant, "hook tip hooking" may occur. 5A and 5B are explanatory views of a hook tip hanging state, where FIG. 5A is a front view and FIG. 5B is a right side view.
A ladle crane generally comprises a hook beam 2 and a hook 3 hung at the ends of the hook beam 2, respectively.
Ladle the ladle by hanging it on the trunnions 4 at both ends of the ladle 5.

Hook tip hanging means that the hook bottom of the hook 3 should originally hang on the bottom of the trunnion 4, but the hook 3 is hung while the tip of the hook 3 is in contact with the bottom of the trunnion 4 for some reason. . FIG. 5 shows a situation in which hook tip hooking occurs on the right side of the ladle 5. Hook beam 2
Is hung from the upper part with the central part as a fulcrum. FIG. 5 shows the case where the hook beam 2 is hung by the hanging beam 1 having both ends thereof hung by the wire rope 7 hanging from the ceiling and having the hanging hand 8 at the center. The lower end of the hanging hand 8 and the center of the hook beam 2 are shown. The parts are connected by a connecting pin 6. In addition, the hanging hand 8 may be directly hung by the wire rope 7 without going through the hanging beam 1.

In any case, the hook beam 2 can be tilted left and right with the connecting pin 6 as a fulcrum, and the ladle 5 can be maintained in a horizontal posture by it, so it is out of the question that it does not hinder the carrying. It is unavoidable that the ladle 5 tilts due to a slight impact and the molten metal of the contents flows out, and it should be avoided for safety. It is difficult for a ladle crane operator to visually detect this hook tip hanging state from the operator's cab, and drastic measures for early detection have been desired.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention provides a hook tip hooking detection device that can automatically detect the hook tip hooking state of a ladle crane and can immediately take corrective action, and a ladle crane equipped with the hook tip hooking detection device. The purpose is to

[0006]

According to a first aspect of the present invention, a ladle is provided with a hook beam and hooks hung at both ends of the hook beam, and the hook is hung on trunnions at both ends of the ladle to hang the ladle. A hook tip hanging detection device mounted on a crane, which is fixed to the hook beam, detects an inclination limit of the hook beam and outputs a detection signal, and stops hoisting of the ladle crane based on the detection signal. And / or a control device for informing a driver of an abnormality, which is a hook tip hanging detection device.

A second aspect of the present invention comprises a hook beam whose central portion is connected to a hanger by connecting pins and hooks which are respectively hung at both ends of the hook beam, and the hooks are hung on trunnions at both ends of the ladle. A hook tip hanging detection device mounted on a ladle crane that suspends a ladle, a pair of strikers fixed to a connecting pin and interlocked with the rotation of the connecting pin, and a detection signal that is hit by a striker fixed to a hanging hand Is a hook tip detection device characterized by having a limit switch for outputting a signal and a control device for stopping the hoisting of the ladle crane based on the detection signal and / or notifying an operator of an abnormality.

A third aspect of the present invention is provided with a hook beam and hooks which are hung by connecting hook heads to the connecting portions at both ends of the hook beam, and hooks are hooked on trunnions at both ends of the ladle. A hook tip hook detection device mounted on a ladle crane for hanging a ladle, which is a striker fixed to each hook head and interlocked with the rotation of the hook head, and a striker fixed to each connecting portion and hit by the striker. A hook tip hooking detection device comprising: a limit switch that outputs a detection signal; and a control device that stops the hoisting operation of the ladle crane based on the detection signal and / or notifies the operator of an abnormality. .

A fourth aspect of the present invention is a ladle crane equipped with any one of the hook tip hook detection devices of the first to third aspects of the present invention.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION According to the first aspect of the present invention, an inclinometer which detects a tilt limit of the hook beam and outputs a detection signal is fixed to the hook beam, and the hoisting of a ladle crane is performed based on the detection signal. The control device is configured to stop and / or notify the driver of an abnormality. Accordingly, if the tilt limit of the hook beam to be detected is set according to the hook beam tilt in the hook tip hanging state, when the hook tip hanging occurs, the inclinometer outputs a detection signal and receives the detection signal. The controller automatically stops the hoisting operation of the ladle crane and / or informs the operator of the abnormality. Therefore, it is possible to avoid hanging the ladle with the hook tip hanging.

The second aspect of the present invention utilizes the rotation of the connecting pin with respect to the hanger along with the inclination of the hook beam whose central portion is connected to the hanger with the connecting pin. In the first aspect of the present invention, the hook beam is used. Instead of fixing the inclinometer to, the pair of strikers was fixed to the hook beam connecting pin, and the limit switch that was hit by the striker to output a detection signal was fixed to the hanger.

Accordingly, if one of the pair of strikers is fixed in such a positional relationship that the limit switch is hit when the striker is rotated around the connecting pin by an amount commensurate with the hook tip hanging state, the limit is reached when the hook tip hanging occurs. The switch outputs a detection signal, and the same effect as the first aspect of the present invention can be obtained. The third aspect of the present invention utilizes the rotation of the hook head with respect to the connecting portion in association with the inclination of the hook beam for hooking the hook head by connecting the hook heads to the connecting portions at both ends, respectively. In place of fixing the inclinometer to the hook beam, the striker was fixed to the left and right hook heads, and the limit switch that was hit by the striker to output a detection signal was fixed to each connecting portion.

Accordingly, if the left and right or both strikers are fixed in such a positional relationship that the limiter rotates around the pin by an amount corresponding to the hook tip hooking state and strikes the limit switch, the limit switch is generated when hook tip hooking occurs. Outputs a detection signal, and the same effect as that of the first aspect of the present invention can be obtained. As is apparent from the above, the ladle crane of the fourth aspect of the present invention equipped with the hook tip hanging detection device of any of the first to third aspects of the present invention can immediately detect the hook tip hanging state, and immediately. Emergency stop of winding,
Measures such as warning can be taken.

[0014]

FIG. 1 is a front view of a ladle crane equipped with an inclinometer and a control device according to a first embodiment of the present invention.
FIG. 2 is a circuit diagram of the control device according to the first embodiment of the present invention. 1 and 2, 9 is a crane girder, 10 is a club, 11 is an electric room, 12 is a driver's cab, 13 is an inclinometer, 14 is a relay panel, 15 is an alarm buzzer, 16 is an indicator light, and 17 is an exciting coil. , 17a, 17b are relay contacts of the exciting coil 17, a contact and b contact respectively, 18 is a main winding control circuit contactor, 19 is a signal line, P
₁ , P ₂ , N ₁ , N ₂ , r and t are power lines. In addition,
The same members as those in FIG.

As shown in FIG. 1, in this embodiment, an inclinometer 13 is arranged at an appropriate position on the hook beam 2 and a detection signal thereof is passed through a path from the hook beam 2 to the hanging beam 1 to the club 10. The signal line 19 leads to the relay panel 14 in the electric room 11. The tilt limit of the inclinometer 13 is set to a value (vertical ± 4 ° in this embodiment) suitable for the hooked state.

As shown in FIG. 2, the controller is an inclinometer.
The excitation coil 17 that is demagnetized by the detection signal from 13, and the demagnetization of the excitation coil 17 makes it "open" and opens the main winding control circuit contactor 18 provided on the relay panel 14 in the electric room 11 to open the ladle crane. Relay contact 17a to stop the winding operation of
And a relay contact 17b which becomes "closed" and sounds the alarm buzzer 15 in the operator's cab 12 and turns on the indicator lamp 16.

As a result, when the inclination of the inclinometer 13 reaches the inclination limit (vertical ± 4 °), a detection signal is sent from the inclinometer 13 to the relay board 14, the hoisting operation of the ladle crane is stopped, and the hook tip ends. At the same time as preventing the ladle from being hung up while being hung, the alarm buzzer 15 and the indicator light 16 are turned on to notify the driver of the occurrence of the hook tip hanging state. 3A and 3B show an attached state of a limit switch and a striker according to the second embodiment of the present invention, where FIG. 3A is a front view of the periphery of a hook beam, FIG. 3B is a side view taken along the line AA of FIG. ) Is (b)
It is a BB arrow front view. In FIG. 3, 20 is a limit switch and 21 is a striker. The same members as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 3, a pair of strikers 21 are provided on the connecting pin 6, a limit switch 20 is provided on a lifting hand (also referred to as a turning post) 8, and the hook beam 2 is tilted when the connecting pin 6 is in a hooked state. If the striker 21 on either side hits the limit switch 20 when rotated by (vertical ± 4 ° also in this case), they are attached respectively. The limit switch 20 outputs a detection signal when hit by the striker 21, and the detection signal is guided to the relay board 14 in FIG. 1 through the signal line 19 provided in the same path as in FIG. In the control circuit of this embodiment, the inclinometer 13 of FIG. 2 is replaced by a limit switch 20. Therefore, this second embodiment of the present invention functions similarly to the first embodiment.

FIG. 4 shows the mounting state of the limit switch and striker according to the third embodiment of the present invention.
Is a side view around the hook, (b) is a cross-sectional view taken along the CC line in (a), and (c) is a side view taken along the DD line in (b). In FIG. 3, 22 is a hook connecting portion and 23 is a hook pin. The same members as those in FIGS. 1 and 2 are designated by the same reference numerals and the description thereof is omitted.

As shown in FIG. 4, the striker 21 is attached to the hook connecting portion 22 of the hook beam 2, the limit switch 20 is attached to the head of the hook 3, and the hook 3 is rotated around the hook pin 23 when the head of the hook is hung on the hook. In the embodiment, 9.2 °), the striker 21 hits the limit switch 20, and the striker 21 is attached to each end of the hook beam 2. The limit switch 20 outputs a detection signal when hit by the striker 21, and the detection signal is guided to the relay board 14 in FIG. 1 through the signal line 19 provided in the same path as in FIG. The control circuit of this embodiment is similar to that of the second embodiment of the present invention.
It is assumed that 13 is replaced by the limit switch 20.
Therefore, this third embodiment of the present invention functions similarly to the first embodiment.

In the first to third embodiments of the present invention described above, the case where both the automatic stopping of the hoisting operation and the alarm / display to the driver are performed by using the detection signal has been shown. Is not limited to this, and only one of them may be performed. Further, although the case where the hook beam is suspended via the suspension beam above is shown, the present invention can be applied to the case where the hook beam is directly suspended by the wire rope.

[0022]

According to the present invention, the hook tip hooking state of the ladle crane can be automatically detected, so that the safety of suspending and transporting the ladle is significantly improved.

[Brief description of drawings]

FIG. 1 is a front view of a ladle crane equipped with an inclinometer and a control device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a control device according to the first embodiment of the present invention.

3A and 3B show a mounted state of a limit switch and a striker according to the second embodiment of the present invention, where FIG. 3A is a front view of the periphery of a hook beam, FIG. 3B is a side view taken along the line AA of FIG.
(C) is a front view of the BB arrow of (b).

4A and 4B show a mounted state of a limit switch and a striker according to the third embodiment of the present invention, FIG. 4A is a side view of the periphery of a hook, FIG. 4B is a sectional view taken along the line CC of FIG. )
FIG. 7B is a side view of FIG.

FIG. 5 is an explanatory diagram of a hook tip hanging state.

[Explanation of symbols]

1 Suspended Beam 2 Hook Beam 3 Hook 4 Trunnion 5 Ladle 6 Connecting Pin 7 Wire Rope 8 Lifter (Swivel Post) 9 Crane Girder 10 Club 11 Electric Room 12 Operator's Room 13 Inclinometer 14 Relay Board 15 Alarm Buzzer 16 Indicator Light 17 exciting coils 17a, 17b relay contacts 18 main winding control circuit contactor 19 signal line 20 limit switch 21 the striker 22 hook coupling portion 23 hook pin _{P 1, P 2, N 1} , N 2, r, t power line

Claims (4)

[Claims] 1. A hook tip hook detection device mounted on a ladle crane, comprising a hook beam and hooks hung at both ends of the hook beam, and hanging the hook on trunnions at both ends of the ladle to hang the ladle. There is an inclinometer which is fixed to the hook beam and detects the tilt limit of the hook beam and outputs a detection signal, and stops the hoisting of the ladle crane based on the detection signal and / or informs the operator of the abnormality. A hook tip hooking detection device comprising: a control device. 2. A ladle for hanging a ladle by hooking hooks on trunnions at both ends of the ladle, the hook beam having a hook beam connected to a hanger at the center with connecting pins, and hooks hanging at both ends of the hook beam, respectively. A hook tip hanging detection device mounted on a pan crane, a pair of strikers fixed to a connecting pin and interlocked with the rotation of the connecting pin, and a limit switch fixed to a hanging hand and hitting with the striker to output a detection signal. A hook tip hooking detection device, comprising: a control device that stops hoisting of the ladle crane based on the detection signal and / or notifies a driver of an abnormality. 3. A hook beam and hooks that are hung by connecting hook heads to the connecting portions at both ends of the hook beam, respectively, and hooks are hooked on trunnions at both ends of the ladle. A hook tip hanging detection device mounted on a pan crane, which is a striker fixed to each hook head and interlocked with the rotation of the hook head, and a limit fixed to each connecting portion and hit by the striker to output a detection signal A hook tip hooking detection device comprising a switch and a control device that stops a hoisting operation of a ladle crane based on the detection signal and / or notifies an operator of an abnormality. 4. A ladle crane equipped with the hook tip hook detection device according to any one of claims 1 to 3.