JPH044967Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a slab width measuring device using a tong crane used for stacking and transporting slabs in a slab yard before charging into a heating furnace.

[Conventional technology]

As shown in FIG. 3, the rolling process at a steelworks consists of a slab yard 10, a conveying table 12, a heating furnace 14, a conveying table 16, a rough rolling mill 18, a finishing rolling mill 20, etc. (not shown) is transferred to conveying table 1 using a slab gripping device.
2, transported by the table, and heated to the heating furnace 14.
The material is charged into a furnace and heated, then taken out from the heating furnace, placed on a conveyance table 16, passed through a rough rolling mill 18, and then passed through a finishing mill 20, where it is rolled to a predetermined thickness and width. The width is determined by adjusting the spacing of the vertical rolls 18a of the rolling mill to obtain the desired final or intermediate product width, which requires knowing the slab width in addition to the target width.

The slab width is the target width of the blooming process in the case of the blooming method, the measured width if the width is measured by hand sampling, and the value converted from the mold width setting in the case of the continuous casting method. We are hiring. Recently, there are also machines that measure the width by installing a dedicated width detector on the outlet side of the continuous casting equipment.

[Problem that the invention attempts to solve]

However, an accurate slab width cannot be obtained by converting from the target width for blooming rolling or the mold setting width for continuous casting. In addition, equipment costs are high with the method of installing a dedicated width detector, and depending on the installation location, the slab width may be cut due to various factors after width measurement, making it difficult to accurately determine the slab width during rolling. There is also the problem that it is not shown.

A tong crane is used to unload slabs from the slab yard 10 to the transport table 12. In the past, electromagnetic cranes were used, but these days, as hot-charging is carried out to save energy, electromagnetic cranes are no longer available, and instead, tong cranes are used, which grip both sides of the slab with tong arms. Tokukai Akira
The "slab gripping device" of No. 57-112287 is an example of this. Since the tong crane grips the slab from both the left and right sides, the width of the slab can be determined by measuring the spacing between the tong arms.Moreover, since this is the value before charging into the heating furnace, it corresponds one-to-one to the width of the slab during rolling. (There is no width cutting after that).

The present invention focuses on such a point, and attempts to construct a slab width measuring device using a tong crane, thereby making it possible to accurately grasp the slab width during rolling.

[Means for solving problems]

The slab width measuring device using the tong crane of the present invention is applicable to the tong crane, which is equipped with a plurality of tong arms that move left and right by a feed screw shaft rotated by a motor and that grip the slab by coming into contact with both end faces of the slab. A pulse generator is attached to the feed screw shaft, and a counter that counts the pulses output by the pulse generator and a converter that calculates the slab width from the count value of the counter and preset distance data are provided. It is characterized by this.

〔Example〕

FIG. 1 is a diagram explaining the configuration of the present invention, in which 30 is a tong crane, 32 is a tong arm (a, b,
. . . is a code that distinguishes each other), 34 is a feed screw shaft,
36 is a motor. When the feed screw shaft 34 is rotated in one direction or the opposite direction by the motor 36, the shaft 3
The tong arms 32a, 32b are screwed into the 4, and the threads of the screwed parts are cut in the opposite direction, so the tong arms 32a, 32b move toward each other or away from each other, When moving, the slab 22 is held. This slab clamping is performed at the front and rear of the slab 22 as shown in FIG.
The slab 22 can be lifted by raising 2d, and the slab can be transported by moving horizontally in that state.

In the present invention, a converter 40 is provided with a pulse generator 38 attached to the feed screw shaft 34 and a counter 41 for counting the pulses generated by the pulse generator.
will be established. Since the pulse generator 38 generates one pulse every predetermined rotation angle of the feed screw shaft 34, the counter 41 is cleared with the tongue arms 32a and 32b opened to the origin positions P ₁ and P ₂ , and then the motor 3
6 rotates and moves the tong arms 32a and 32b in a direction toward each other until the tip of the tong arms abuts both sides of the slab 22 and the motor stops. At that time, the pulse generator 38 outputs a pulse. By counting with the counter 41, the illustrated distance l can be measured. Once the distance l is determined, the slab width W can be determined as W=L-2l, where L is the distance between the origins P ₁ and P ₂ , and this calculation is performed by the converter 40 when lifting the slab. The slab width W output by the converter 40 is output to the display 42 for display, and is also input to the computer (process computer) 44 for tracking, when the slab leaves the heating furnace 14 and enters the rough rolling mill 18. , the vertical roll 18
Used to set the opening of a.

The tong crane 30 is shown in more detail in FIG. 4. 36 is an electric motor for opening and closing the claw, 50, 54
52 is a clutch, 58 is a brake, 60 is a speed reducer, 62 and 66 are sprockets, and 64 is a drive chain, through which the feed screw shaft 34 is rotated by the motor 36. The tong arms 32a and 32b are connected to the frame 74.
and is slidable along the frame 74. The tong arms 32a and 32b are connected to the feed screw shaft 3.
4, this sliding movement occurs when the feed screw shaft 34 rotates. Although not shown, the frame 74 is suspended from a crane traveling truck mechanism and is movable up and down and horizontally. There is a slope at the tip of the tong arm, and a claw 6 that can move along this slope
8 is installed. The pawl 68 is constantly driven in the upward direction by a spring 70, and is in the state shown in the figure by a stopper 72, but when the pawls 68 of the left and right tong arms grip the slab 22 and try to lift it, the downward force due to the weight of the slab is applied. receive. However, since the tip of the tong arm is sloped, as it descends, the gap between the left and right claws becomes smaller, and both sides of the slab 22 are pressed hard. In this way, the slab 22 is
Although it is possible to securely grip the slab and transfer the slab, the lowering of the claw 68 may cause an error in measuring the slab width. However, it is possible to measure and understand this error in advance and correct it by presetting a predetermined number corresponding to the error in the counter 41, or by excluding the predetermined number when calculating the width with the converter 40. can.

There are tong cranes that not only have pairs of tong arms at the front and rear of the slab, but also have them in the center to clamp the slab at multiple points. By measuring the width at each point in the longitudinal direction of the slab, it is possible to adjust the opening of the vertical rolls during rolling to obtain a uniform slab width.

In the embodiment, the feed screw shaft is common to the left and right pair of tong arms, but there is also a type in which the feed screw shafts are separate and each is driven by its own motor.
In this case, a pulse generator may be attached to each feed screw shaft and a counter for counting the output pulses may be provided.

[Effect of idea]

As explained above, according to the present invention, the width of the slab can be measured using a tong crane, so the width of the slab can be accurately formed using a rolling mill. It is inexpensive because it only needs to be provided, and it has the advantage that it can be measured automatically during the work of transferring the slab from the slab yard to the conveyance table, so no special measurement work is required.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the device of the present invention, Fig. 2 is an explanatory diagram of the slab sandwiched state, Fig. 3 is an explanatory diagram of the rolling equipment,
FIG. 4 is a schematic side view illustrating the tong crane. In the drawing, 36 is the motor, 34 is the feed screw shaft, 22
is a slab, 32 is a tong arm, 30 is a tong crane, 38 is a pulse generator, 41 is a counter,
40 is a converter.

Claims (1)

[Scope of utility model registration request] left by the feed screw shaft rotated by the motor,
A pulse generator is attached to the feed screw shaft of a tong crane equipped with a plurality of tong arms that move to the right and sandwich the slab by coming into contact with both end faces of the slab, and a counter that counts the pulses output by the pulse generator; A slab width measuring device using a tong crane, characterized in that it is provided with a converter that calculates the slab width from the counted value of the counter and preset distance data.