JPH08164470A - Ladle cover attaching/detaching device - Google Patents

Abstract

PURPOSE: To constitute a ladle cover attaching/detaching device simple and in small size by including no mechanism to travel in the horizontal direction. CONSTITUTION: The device 1 is provided with a frame 2 rigidly mounted on a foundation 45 which horizontally crosses over a ladle 47, a hoist mechanism 10 mounted on the frame 2, an elevation frame 20 to be elevated by the hoist mechanism 10, a tong opening/closing mechanism 30 mounted on the elevation frame 20, a pair of tongs 28... to hold the upper frame 41 of a ladle cover 40 to be opened/closed by the tong opening/closing mechanism 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pot lid attaching / detaching device.

[0002]

2. Description of the Related Art A device for attaching and detaching a pan lid that closes the upper opening of a ladle is disclosed, for example, in Japanese Utility Model Publication No. 61-45972, "Moveable pan lid attaching / detaching device", and in Japanese Utility Model Publication No. 60-5975, "Heat retaining lid for ladle". The technology of "detachment device" has been proposed. As described above, as shown in FIG. 2 of the publication, a crane girder rail-shaped rails 1 and 1 are mounted with a traveling carriage 9 in the form of an overhead crane, and a lid attaching / detaching machine 26 is attached to the traveling carriage 9. The lid 44 is lifted by the attaching / detaching machine 26, and the traveling carriage 9
The lid 44 is moved to the lid temporary storage place by traveling.

Further, the above description is based on FIGS. 2 and 3 of the publication.
As shown in the drawing, the frame-shaped main frame 1 stores the frame-shaped lifting frame 3, and the lifting frame 3 holds the gripping claws 7.
And the like, and the lifting frame 3 is lifted and lowered by one lifting member 2. The runout of the lifting frame 3 is caused by a slide on the lifting frame 3 side on a guide plate 4 mounted on the inner surface of the main frame 1. It has a structure in which the plate 5 is held in sliding contact with the plate 5.

[0004]

Since the above-mentioned structure is basically the same as the structure in which the lid attaching / detaching machine 26 is attached to the overhead crane, the positional deviation easily occurs in the horizontal (traveling) direction.
Therefore, it is necessary for the operator to perform an operation to correct the positional deviation. Also, according to the detailed explanation, it is said that the automatic operation is performed "by a limit switch (not shown)".
There is a possibility that the four engaging claws 43 may not be properly engaged with the hanging fitting 45 on the lid 44 side. This is because the metal or the metal sticks to the top edge of the pot 7, and the lid 44 is attached due to this deposit.
The height position fluctuates or tilts, which tends to cause poor engagement, but no countermeasure for this point is described.

In the above, the lifting frame 3 is forced to have a three-dimensional frame structure in order to prevent steady movement, and the entire apparatus becomes large. Further, similarly to the above, no consideration is given to the inclination and height variation of the lid 6 due to the metal or the metal. Therefore,
An object of the present invention is to simplify the device and to take effective measures against the inclination and height variation of the pot lid due to the ladle and the metal.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention relates to a frame which is horizontally passed over the ladle and is directly or indirectly attached to a foundation firmly. Attached hoist mechanism, lifting frame raised and lowered by this hoist mechanism, tongue opening and closing mechanism attached to this lifting frame, and two sets of tongs that are opened and closed by the tongs opening and closing mechanism to grip the upper frame of the pan lid. The pot lid attaching / detaching device is constructed from.

Desirably, the hoist mechanism is composed of two electric hoists arranged above the tongs of each set.

[0008]

[Function] The upper frame of the pan lid is gripped by the tongue opening / closing mechanism, and the pan lid is lifted together with the tongue opening / closing mechanism by the hoist mechanism to separate from the ladle. Since the mechanism for moving the pan lid in the horizontal direction is not included, the pan lid attaching / detaching device can be configured simply and in a small size.

By using two electric hoists, the lifting frame can be tilted and the tilted pan lid can be surely removed.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a perspective view of a pot lid attaching / detaching device according to the present invention. The pot lid attaching / detaching device 1 is horizontally extended so as to straddle an upper portion of a ladle 47, and a frame 2 firmly attached to a foundation 45. Hoist mechanism 10 attached to frame 2 and this hoist mechanism 1
The lifting frame 20 that is lifted up and down at 0, the tongue opening and closing mechanism 30 attached to the lifting frame 20, and the upper frame 4 of the pan lid 40 that is opened and closed by the tongue opening and closing mechanism 30.
2 sets of tongs 28 that grip 1, 41 (1 set of 2 tongs 28, 28 .... indicates a plurality. The same applies hereinafter). In the figure, 43 is a ladle truck, 44 and 44 are rails, and 46 is a pit.

The frame 2 has, for example, two main girders 3 and 3.
And two cross girders 4 and 4 connecting these main girders 3 and 3, inverted V-shaped leg frames 5 and 5 erected on the main girders 3 and 3, and on these leg frames 5 and 5. It is composed of a cross frame 6 that is hung over. The hoist mechanism 10 is
Two electric hoists 11, 11 mounted on the cross frame 6 in parallel at a constant interval are suitable. As shown in FIG. 6A, the electric hoist 11 includes, for example, a motor 12 with a speed reducer, a wire drum 13, and a mounting bracket 1.
4 and.

FIG. 2 is a perspective view of an essential part of the pot lid attaching / detaching device according to the present invention, and shows that the hook 17 can be raised and lowered via the wire 15 and the pulley 16 by rotating the wire drum 13 in the forward and reverse directions. The elevating frame 20 is a frame having a rectangular shape in a plan view, and includes a bracket 21 corresponding to the hooks 17, 17.
The pin 2 which is provided with 21 and is inserted into the brackets 21 and 21.
It is a structure in which hooks 17, 17 are hooked on 2, 22. FIG.
3 is a sectional view taken along line 3-3 of FIG.
Two of the sides are channels 24, 24 facing each other with their backs facing each other at a constant interval.
The upper wheel 26 and the lower wheel 27 of the car 25L are brought into contact with the upper and lower surfaces of the wheels 4 and 24, and the tongue 28 is hung from the car 25L with the channels 24 and 24 being passed between them, and the screw 31 is used to move the car in the reverse direction of the figure. 25L and tongs 28 are moved.

Returning to FIG. 2, the tongue moving mechanism 30 includes cars 25L and 25R (25L is a left car and 25R is a right car) equipped with the tongs 28 and these cars 25L and 25R. Screws 31 and 31 in which a left screw and a right screw are engraved on one axis for moving, and a sprocket 32 for rotating these screws 31, 31
32, tensioner sprocket 33, 33, chain 3
4, 34, a double-row sprocket 35, and a motor 36 with a speed reducer. The car 25L and the car 25R approach each other by rotating the screw 31 in the forward direction, and the car 25L and the car 25R separate from each other by rotating the screw 31 in the reverse direction.

The pan lid attaching / detaching device 1 of this embodiment is equipped with the following three types of sensor mechanisms. These are the tongue lower limit position detection mechanisms that determine the lower limit position of the tongue 28,
The tong upper limit position detecting mechanism for determining the upper limit position (or the standby position) of the tongue 28 and the tongue horizontal position detecting mechanism for determining the reciprocating movement position of the tongue 28 will be described below.

FIGS. 4 (a) and 4 (b) are a structural view and an operation diagram of the tongue lower limit position detecting mechanism according to the present invention. The tongue lower limit position detecting mechanism 50 is a bracket 51 hanging from the elevating frame 20 and this bracket. A limit switch 53 and a swing lever 54 attached to 51, a weight 56 suspended from one end of the swing lever 54 via a chain 55, and a balance weight 57 attached to the other end of the swing lever 54. The couple weight by the weight 56 is larger than the balance weight 57. In (a), the weight 56 is the swing lever 54.
, The swing lever 54 rotates in the counterclockwise direction around the pin 58, and the limit switch 53 is “OFF”. In (b), since the weight 56 is placed on the upper frame 41 and the chain 55 is slack, the swing lever 54 rotates clockwise in the drawing, and the limit switch 53
Indicates that it is turned on. At this time, since the rotation of the swing lever 54 is restricted by the stopper pin 59, the swing lever 54 does not rotate excessively.

FIGS. 5 (a) and 5 (b) are block diagrams and operation diagrams of the lid detecting mechanism according to the present invention, and the lid detecting mechanism 80 is substantially the same structure as the tongue lower limit position detecting mechanism 50 described in FIG. And only chain 85 is longer than said chain 55. The other components are the same, but reference numerals in the 80s are newly added to distinguish them. That is, the lid detection mechanism 80
Is a bracket 81 hanging from the lifting frame 20, a limit switch 83 and a swing lever 84 attached to the bracket 81, a weight 86 suspended from one end of the swing lever 84 via a chain 85, and a swing lever 84. And a balance weight 87 attached to the other end of the. The couple force of the weight 86 is larger than that of the balance weight 87.
(A) shows a state in which the weight 86 pulls down one end of the swing lever 84, the swing lever 84 rotates counterclockwise around the pin 88, and the limit switch 83 is "off". (B) shows that the weight 86 is placed on the upper frame 41 and the chain 85 is slackened, so that the swing lever 84 is rotated clockwise in the drawing and the limit switch 83 is turned on. At this time, since the rotation of the swing lever 84 is restricted by the stopper pin 89, the swing lever 84 does not rotate excessively.

FIGS. 6 (a) and 6 (b) are a structural view and an operation view (corresponding to the arrow 6 view of FIGS. 4 and 5) of the tongue horizontal position detecting mechanism according to the present invention. Is
As shown in (a), the striker 6 attached to the car 25R
1 and a tongue open limit sensor 62 and a tongue close limit sensor 63 attached to the lifting frame 20 side. (A) shows a state in which the tongues 28 and 28 are opened, and at this time, the striker 61 kicks the tongue opening limit sensor 62. Lift the tongs 28L and 28R to the lifting frame
When you lower it with the arrow, along with it, the weight 5
6, 86 abut on the upper surface of the upper frame 41. (B)
As a result of the weights 56 and 86 coming into contact with the upper surface of the upper frame 41, the chains 55 and 85 bend (,).
The limit switch 53 detects the lower limit position of the tongue 28 in the manner of (b). Based on this detection signal, the control unit (not shown) starts the motor 36 shown in FIG.
Drive R as indicated by the arrow. When the striker 61 kicks the tongue closing limit sensor 63, the signals of the sensor 63 stop the cars 25L and 25R. The tongs 28, 28 shown in phantom are in the closed position.

FIG. 7 is an operation diagram of the lid detecting mechanism. Figure 6
When the elevating frame 20 is raised in FIG.
The tongs 28, 28 are hooked on the flange of the upper frame 41 as shown in FIG. At this time, the chain 55 having a short length tensions the weight 56 from the upper flange 41 and turns off the limit switch 53. On the other hand, since the long chain 85 remains bent, the limit switch 83 remains on. Therefore, while lifting the lid, the weight 86,
It is possible to confirm "with a lid" by the chain 85 and the limit switch 83.

The operation of the ladle attaching / detaching device described above will be described below. In FIG. 1, a ladle 47 covered with a pan lid 40.
The ladle dolly 43 is moved horizontally to move the ladle lid attaching / detaching device 1
(See the arrow in FIG. 8A). The ladle truck 43 has a positioning sensor and a brake system (not shown) (for example, the brake is applied stepwise) for several mm.
It can be stopped with an accuracy of tens of mm (for example, 20 mm).

FIGS. 8 (a) to 8 (d) are views for explaining the standard operation of the ladle attaching / detaching device according to the present invention. (A) shows that four (front, rear, left, and right) tongs 28 ... Are at the upper limit (or standby) position. The upper limit position (or standby) position is determined by raising the elevating frame 20 by the electric hoist 11 and kicking the tongue upper limit position detection sensor 73 via the sub wire 71 and the weight 72 at the tip thereof. Specifically, the motor 12 is stopped by the detection signal of the sensor 73. That is, in the present embodiment, the sub wire 71, the weight 72, and the tongue upper limit position detection sensor 73 constitute the tongue upper limit position detection mechanism 70. However, the sensor 73
Is fixed to the frame 2 with a bracket (not shown).

(B) shows the lowering operation of the tongs 28 ...
The motor 12 rotates the wire drum 13 to move the tongs 2
8 ... is lowered. (C) shows a state in which the tongs 28 ... Are moved to the closed position. The operations of (c) and (b) are as described in FIG. 6 (b).
(D) shows the hoisting operation of the pan lid 40, and the wire drum 13 is rotated by the motor 12 to the winding side, and the pan lid 40 is hoisted by the tongs 28 ... And separated from the ladle 47. Note that the motor 12 at this time is stopped by the detection signal of the upper limit position detection sensor 73, or by any means such as a timer, the rotation speed of the motor, or a height position detection monitor (not shown) of the elevating frame 20. Good.

Although the operation of opening the pan lid 40 has been described with reference to FIGS. 8A to 8D, the operation of closing the pan lid 40, that is, the operation of covering the pan lid 40 on the pan 47 is performed as shown in FIG. (C) → (b)
→ It may be carried out in the order of (a).

FIGS. 9 (a) and 9 (b) are explanatory views of the operation of the tilted pan lid according to the present invention, and correspond to the arrow 9 view of FIG. 6 (b) (however, a modified example). In FIGS. 9A and 9B, the subscript L indicates left and R indicates right, which are added for convenience of description. Since the ladle 47 handles molten steel, the bare metal 75 sometimes adheres to the upper edge. Pot lid attaching / detaching device 1
It will be described below that can sufficiently cope with such adhesion of the metal 75. (A) shows that the metal pot 75 is attached to a part of the upper edge of the ladle 47, so that the pot lid 40 is covered in a state of being inclined by the angle θ. This pot lid 4
When the elevating frame 20 is lowered to open 0, the upper frame 41L is located higher than the upper frame 41R, so that the weight 56L comes into contact with the upper frame 41L, the limit switch 53L is turned on, and the electric hoist 1
Stop 1L. On the other hand, since the right weight 56R is not yet in contact with the upper frame 41R, the right electric hoist 11R continues the lowering operation.

(B) shows that the right weight 56R is in contact with the upper frame 41R, the limit switch 53R is turned "on", and the electric hoist 11R is stopped. As a result, the two electric hoists 11L and 11R both stop, and the suspended elevating frame 20 tilts by the angle θ similarly to the pan lid 40, and as a result, the left and right tongs 28L and 28R both have substantially the same dimension d. , D only upper frame 41L, 4
It means that it was wrapped in 1R. After that, the tongs 28L and 28R are moved to the closed position by the AND signals of the limit switch 53L and the limit switch 53R. Therefore, even if the pan lid 40 is tilted to a considerable extent, the elevating frame 20 can be adjusted to this tilt, so that there is no concern that the tongs 28L and 28R will be "missed".

The position sensor described in this embodiment is preferably a limit switch, but the position switch is not limited to this, and any kind of position detection switch such as a proximity switch or an optoelectronic switch may be used. Although the frame 2 is directly fixed to the foundation 45 in this embodiment, the frame 2 may be fixed to the foundation 45 via an appropriate frame, that is, indirectly.

[0026]

The present invention has the following effects due to the above configuration. The pot lid attaching / detaching device according to claim 1 is a frame which is horizontally passed over the ladle and is firmly attached directly or indirectly to a foundation, a hoist mechanism attached to the frame, and this hoist mechanism. It consists of an elevating frame lifted up and down, a tongue opening and closing mechanism attached to this elevating frame, and two sets of tongs that are opened and closed by the tongue opening and closing mechanism to grip the upper frame of the pan lid. Since the mechanism for moving the pan lid is not included, the pot lid attaching / detaching device can have a simple structure and can be configured sufficiently small.

In the pot lid attaching / detaching device of the second aspect, since the electric hoists are arranged above the tongs of each set, the elevating frame can be tilted, and the tilted pot lid can be surely attached / detached. Therefore, the burden on the driver of the apparatus can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a pot lid attaching / detaching device according to the present invention.

FIG. 2 is a perspective view of an essential part of a pan lid attaching / detaching device according to the present invention.

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a block diagram and operation diagram of a tongue lower limit position detection mechanism according to the present invention.

FIG. 5 is a block diagram and operation diagram of a lid detection mechanism according to the present invention.

FIG. 6 is a block diagram of a tong horizontal position detection mechanism according to the present invention

FIG. 7 is an operation diagram of a lid detection mechanism according to the present invention.

FIG. 8 is an explanatory view of a standard operation of the ladle attaching / detaching device according to the present invention.

FIG. 9 is an explanatory view of the operation of the inclined pan lid according to the present invention.

[Explanation of symbols]

1 ... Pot lid attaching / detaching device, 2 ... Frame, 10 ... Hoist mechanism, 1
1 ... Electric hoist, 13 ... Wire drum, 20 ... Lifting frame, 25, 25L, 25R ... Car, 28, 28L,
28R ... tongs, 30 ... tongs opening / closing mechanism, 31 ... screw, 36 ... motor, 40 ... pan lid, 41, 41L, 41
R ... Upper frame, 43 ... Ladle cart, 45 ... Foundation, 47
... ladle, 50 ... tong lower limit position detection mechanism, 60 ... tong horizontal position detection mechanism, 70 ... tong upper limit position detection mechanism, 7
5 ... bullion.

Claims (2)

[Claims] 1. A frame which is horizontally passed over an upper part of a ladle and is directly or indirectly firmly attached to a foundation, a hoist mechanism attached to the frame, and a hoisting mechanism which is lifted up and down by the hoist mechanism. A pot lid attaching / detaching device comprising a frame, a tongue opening / closing mechanism attached to the lifting frame, and two sets of tongs that are opened / closed by the tongs opening / closing mechanism to grip an upper frame of the pot lid. 2. The pot lid attaching / detaching device according to claim 1, wherein the hoist mechanism is composed of two electric hoists arranged above the tongs of each set.