JP3046510B2 - Main winding hook detachment detector of ladle crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladle crane for charging hot metal in a converter, which is used to prevent a main hook from coming off from a metal fitting of a hot metal pot when charging hot metal into a converter. It concerns the device.

[0002]

2. Description of the Related Art An operation procedure for charging hot metal into a converter using a hot metal charging ladle crane is performed by hanging a main winding ladle hook on a hanging metal fitting of a hot metal ladle containing hot metal and lifting the hot metal from the front of the converter. After being roughly positioned at the center height of the furnace mouth of the converter, which is stopped by tilting it to the position where the hot metal is received, it is wrapped around the hot metal tilting bracket attached to the bottom of the hot metal ladle. Hook up the hook, position the leading end of the hot metal ladle entrance in the converter mouth, gradually raise the auxiliary hook, tilt the hot metal pot little by little, and remove the hot metal in the hot metal pot into the converter. I will charge it inside.

[0003] When the hot metal pot is inclined, the tip of the charging port of the hot metal pot contacts the inside of the furnace opening of the converter. If the auxiliary hook is further wound up while the tip end of the inlet of the hot metal pot is in contact with the furnace opening of the converter, the main winding ladle hook comes off from the metal fittings of the hot metal pot. In order to prevent this, it is necessary to wind up the main winding ladle hook or to further incline the converter in a direction in which the inclination angle increases while the hot metal is being charged.

When hoisting the main winding ladle hook, the crane is operated in accordance with a signal from a signer on the ground. In addition, when tilting the converter, it is common that a signal person on the ground performs the operation of tilting the converter.

[0005]

In the operation procedure described above, the cooperative operation between the crane operation and the converter tilting operation is very difficult, and the tip of the inlet of the hot metal pot contacts the inside of the furnace opening of the converter. In some cases, the main winding ladle hook came off the metal fittings of the hot metal pot. This can be caused by a variety of causes, including, for example, mistakes made by the signaler, errors in communication between the signaler and the crane operator, errors in the operation of the crane operator in tilting the hot metal pot, and errors in the operation of the ground signaler in the converter tilt It is based on.

[0006] It is an object of the present invention to solve the above-mentioned problems and to improve the safety of charging hot metal into a converter.

[0007]

SUMMARY OF THE INVENTION The present invention has been developed to solve the above-mentioned problems, and has a roll having a main winding and an auxiliary winding.
A weight detecting means for detecting the weight acting on the main winding hanger device of the furnace hot metal charging ladle cranes, was suspended by the main winding
Weight signal determining means for comparing the detected weight signal of the weight detecting means when the hot metal pan is tilted by auxiliary winding with a predetermined reference weight, and an alarm output means for outputting an alarm signal based on the determination The present invention provides a main-hook detachment detection device for a hot metal charging ladle crane, comprising:

[0008]

According to the present invention, there is provided a hot metal charging ladle crane having a main operation of charging hot metal into a converter in the following (a) to (d).
Is provided. (A) It is provided with a weight detecting means for detecting the own weight of the hot metal pot and the weight of the hot metal acting on the main winding hanging device. (B) When the hot metal is being charged into the converter, a reference weight for determining in advance that the main winding ladle hook is coming off from the metal fittings of the hot metal pot is input and set. A determination reference weight input unit is provided. The criterion weight changes in the course of the hot metal charging process, but is at least larger than the weight of the hot metal pot. (C) The weight signal continuously detected by the weight detecting means is received, and the weight signal is received and compared with the reference weight. Weight signal determining means for determining that the weight is coming off the hanging fitting is provided. (D) An alarm output means for outputting an alarm signal to the crane operator when it is determined that the main winding ladle hook is coming off from the metal fittings of the hot metal pot.

The main winding hook detachment detecting device of the present invention continuously detects the total weight of the weight of the hot metal pot and the weight of the hot metal acting on the main winding hanging device, thereby detecting the hot metal pot during hot metal charging. Since the weight acting on the main hoisting device is reduced when the charging inlet tip comes into contact with the inside of the furnace opening of the converter, it is detected that the main winding ladle hook is coming off from the metal fittings of the hot metal pot. In other words, at the moment when the tip of the inlet of the hot metal ladle contacts the furnace opening of the converter, the weight acting on the main hoisting device does not decrease, but when the auxiliary hook is further wound up from this state, it acts on the main winding wire rope. When the total weight of the hot metal pot weight and hot metal weight acting on the main hoist hanging device becomes 0 tons, the main winding ladle hook is This means that it has been removed from the metal fittings.

[0010]

An embodiment of the present invention will be described below.
FIG. 1 is a diagram illustrating the operation of a ladle crane to which the present invention is applied. FIG. 2 shows an example of a block configuration of the apparatus of the present invention. FIG. 3 shows an example of the alarm circuit. FIG. 1 is an explanatory view of an operation state of a ladle crane, and FIG. 1A shows a state in which a hot metal ladle 7 for charging hot metal into a tilting converter 10 approaches. The main winding ladle hook 5 hangs a hot metal pot hanging metal fitting 8. FIG. 2B shows a state in which the auxiliary hook 6 pulls up the hot metal pan tilting hanging metal fitting 9 to tilt the hot metal pan 7, and the tip of the hot metal pan 7 is caught on the mouth of the converter 10,
The main winding ladle hook 5 has been removed from the hot metal ladle hanging metal fitting 8.

In FIG. 2, the weight detecting means 1 employs a load cell type weighing device in the present embodiment, and includes a load cell 1a and a weight signal converter 1b. If it is desired to arbitrarily set the determination reference weight, it is necessary to employ a load cell type weigher capable of detecting the weight as a continuous amount. When it is not necessary to arbitrarily set the determination reference weight, a load limiter or the like that detects one or several weights may be employed. The criterion weight input means 2 is:
In this embodiment, an analog meter type meter relay is used. This determination reference weight is input to the weight signal determination means 3 and set. In this embodiment, the configuration is such that the determination is made by the meter relay. The alarm output unit 4 outputs an alarm such as a buzzer or a chime based on the determination signal of the weight signal determination unit 3. As an example of the load cell of the superimposition detecting means, there is a load cell of a type incorporated in a bearing of an upper sheave of a crane main winding device.

In FIG. 3, LC is a weight converter, and MR is a meter relay. Output signal M of meter relay MR
R1 is a contact that outputs an ON signal when the weight is equal to or greater than W1.
A relay R for outputting an N signal and establishing an alarm circuit
Activate 1 The output signal MR2 is a contact for outputting an ON signal when the weight becomes W2 or less, and the state where the main winding hook is coming off from the hanging metal fitting of the hot metal pot, that is, the weight acting on the main winding device is larger than the reference weight. When the number decreases, an ON signal is output, and the relay R2 for sounding the buzzer BZ is operated.

SW is a switch for turning on and off the entire alarm circuit, and PB is a push button switch for turning off the alarm circuit when the hot metal charging is completed.

[0014]

As described above, according to the present invention, when charging molten iron into the converter, a signaler makes a mistake in judgment, a communication error between the signaler and the crane operator, or a crane operator. The tip of the inlet of the hot metal ladle contacts the inside of the converter furnace mouth due to the misoperation of the hot metal ladle tilting operation mistake or the operation error of the ground signaler's converter tilting, and the main winding ladle hook is Since it was possible to prevent an unsafe state of coming off from the hanging metal fittings, it was possible to improve the safety of hot metal charging work into the converter.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the operation of a ladle crane for charging hot metal into a converter.

FIG. 2 is a block diagram of an embodiment of the present invention.

FIG. 3 is an alarm circuit diagram of one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Weight detecting means 1a Load cell 1b Weight signal converter 2 Judgment reference weight input means 3 Weight signal judging means 4 Alarm output means 5 Main winding ladle hook 6 Supplementary hook 7 Hot metal pot 8 Hot metal ladle hanging metal fitting 9 10 converter

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B66C 13/00-15/06

Claims (1)

(57) [Claims] 1. A weight detecting means for detecting a weight acting on a main hoisting device of a converter hot metal charging ladle crane provided with a main winding and an auxiliary winding, and a hot metal pot suspended by the main winding is used as an auxiliary winding. Yo
Weight signal judging means for judging the weight signal detected by the weight detecting means at the time of tilting with a predetermined reference weight, and alarm output means for outputting an alarm signal based on the judgment. A main winding hook disengagement detecting device for a ladle crane charged with hot metal.