JPS6118024Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a billet charging and extraction device for a rotary hearth type heating furnace.

The billet charging and extraction device is installed at the billet charging inlet 1a and billet extraction port 1b of the rotary hearth heating furnace 1, as shown in FIG. 1, and is used to charge and extract billet 2. It will be done.

Conventionally, such a billet charging/extracting device is constructed as shown in FIG. 2 and operates as follows.
For example, two pairs of claw bodies 3A and 3B are mounted on a horizontally provided claw support 4, and a claw drive body 5 provided at the other end of the claw support 4 moves the claw bodies 3 as shown in FIG. It is designed to rotate freely to open and close to grip the steel piece 2. This claw support 4 is connected to the heating furnace 1
A cart 7 that runs on a beam 6 provided outside toward the center of the rotary hearth type heating furnace 1 advances and retreats at each steel shingle loading inlet 1a and extraction port 1b. In addition to the drive source 8 for traveling, the trolley 7 is provided with an elevating drive source 9 consisting of a link mechanism that moves the pawl support 4 up and down.
are raised and lowered within the heating furnace 1.

In such a steel billet charging/extracting device, billets are charged into the heating furnace 1 in the following manner.
After the claw body 3 grips the steel billet 2 on the conveying device 10a outside the furnace, the cart 7 travels toward the heating furnace 1 and carries the steel billet 2.
is charged onto the rotary hearth 11 (see FIG. 1) (see FIG. 3a). Next, the claw support 4 is moved to the lifting drive source 9.
Then, the steel piece 2 is placed on the rotary hearth 11 (see b in the same figure). Then, the pawl driving section 5 opens the two pairs of pawl bodies 3A and 3B and places the steel piece 2 on the rotary hearth 11 (see c in the same figure). Thereafter, the claw body 3 rises while remaining open or closed, and retreats out of the furnace to grip the next steel piece on the conveying device 10a. During this time, the rotary hearth 11 transports the steel slabs 2 toward the extraction port 1b, and moves one pitch to position the loading point of the next steel slab to be charged at the charging port 1a.

The loaded steel pieces 2 are transported toward the extraction port 1b by the rotating hearth 11 that moves intermittently, and during this time each steel piece 2 is heated to a desired temperature.

At the extraction port 1b, the heated steel piece 2 is extracted by an operation that is almost the reverse of the above-described procedure, and transferred to the conveying device 1.
At 0b, it is sent to the next rolling process, etc.

In such an operation, the claws that grip the steel pieces perform the opening and closing operations as described above, so the steel pieces on the rotary hearth need to be mounted at intervals that do not interfere with this. Therefore, one pitch in the intermittent movement of the rotary hearth is set to be a distance that ensures the operating range of the claw body.

By the way, if this pitch is more than a suitable interval for heating the steel pieces, it will leave wasted space on the rotary hearth. This imposes a limit on the throughput of heated steel billets, and the throughput of the heating furnace is not fully utilized. In other words, if a space is secured between the pieces of steel on the rotary hearth for the claws to open and close, the production volume that fully utilizes the processing capacity of the heating furnace and the thermal energy used to heat the pieces of steel will be wasted. There are limits to mass production efficiency and energy conservation.

This invention was developed to solve the above-mentioned problems, and it enables opening and closing operations when charging and extracting steel billets using claw bodies, and also heats the interval between steel billets placed on the rotary hearth. To provide a billet charging/extracting device for a rotary hearth type heating furnace, which can be short enough to cause no problem, increase the amount charged into the heating furnace, and thereby save energy. With the goal.

The feature is that a lever mounting body is attached to the claw support body on which the claw body is attached, and a lever drive body is provided to remotely rotate the lever provided on the lever mounting body, and the claw body is made of steel. As a billet charging/extracting device for a rotary hearth type heating furnace, the levers placed before and after the grip rotate to move one billet close to or away from another billet on the rotary hearth. That's true.

Hereinafter, the present invention will be described in detail based on examples thereof.

FIG. 4 is a plan view of the charging/extracting device 20 of the present invention, and FIG. 5 is an enlarged view of the charging/extracting device 20 as viewed from the - line arrow. The billet charging/extracting device 20 includes a lever 24 and a lever driver 2 for moving the billet 2 on a rotating hearth.
Since there is no difference from the conventional example except for 5, the same reference numerals are given.

In FIG. 4, a claw support 4 is equipped with a claw body 3 that can be opened and closed to grip the heated steel piece 2 in order to charge and extract it into a rotary hearth type heating furnace, and this claw support 4 is equipped with a lever mounting body. 21 is attached. This lever mounting body 21 consists of a lever shaft 23 rotatably supported by a support member 22 protruding from the claw support 4 and a lever 24 fixed to the lever shaft 23.
A lever drive body 25 such as a cylinder that remotely rotates the lever 3 is provided on the truck 7 side. This lever 24 rotates before and after the claw body 3 grips the steel piece 2 on the rotary hearth 11, and moves one steel piece 2 on the rotary hearth 11 toward or away from another steel piece 2. be.

In addition, when the levers 24 are provided at two locations in the radial direction of the rotary hearth 11 as shown in FIG.
Each lever 24a, 2 is moved so that the moved steel piece 2 still coincides with the radial direction of the rotary hearth 11.
It is necessary to vary the amount of rotational movement of the tip of 4b. Therefore, the lever shaft 23 (not shown) is tilted upward toward the center of the rotary hearth 11 with respect to the horizontally installed claw support 4, and the levers 23 are tilted upward in the radial direction of the rotary hearth 11. It is better to make 24a long.

The lever 24 may be partially bent as shown in FIG. 6, which is convenient when operated at the steel shingle loading inlet 1a, as will be described later.

By the way, since the lever 24 is inserted into the high-temperature heating furnace 1, it is preferable to keep it cool.
As shown in the figure, the inside of the lever shaft 23 and the lever 24 are formed into double pipes, and the cooling water is supplied from the truck 7 side to the inner pipe 2.
If heated cooling water is supplied into the lever 24 through the pipe 6 and discharged through the space outside the branch pipe 27 and the inner pipe 26, durability can be improved.

Since the present invention is configured as described above, the steel billets can be charged and extracted in the following manner, and at that time, the loading interval of the steel billets can be adjusted on the rotary hearth.

First, the case where the steel billet 2 is charged into the heating furnace 1 will be described.

As shown in FIG. 6, after the claw body 3 holding the steel piece 2 is loaded into the steel piece charging inlet by the traveling of the cart 7 outside the furnace, the claw support 4 is lowered by the lifting drive source.

When the steel piece 2 is placed still on the rotary hearth 11 as shown by the two-dot chain line, the claw body 3 is opened by the claw driver and the steel piece 2 is placed on the rotary hearth 11. When the claw body 3 rises while remaining open or closed, the lever 24 is then rotated by the lever driver as shown by the two-dot chain line. When the steel billet 2 is further rotated as shown by the broken line, the steel billet 2 rolls as shown by the broken line and comes close to the previously charged steel billet 2a. When the lever 24 is bent as shown, the lever end can be rotated beyond just below the claw body 3. Note that if the center of rotation of the lever 24 is provided directly below the claw support 3 as shown in FIG. 8, the steel piece 2 can be moved even if the lever is not bent.

When the lever 24 is returned to its original position, the lever mounting body 23 is retracted from the furnace together with the claw support 4, and during this time the rotary hearth 11 moves forward by one pitch. Therefore,
When loading the next piece of steel 2, a mounting position for that purpose and a space that allows the claw body 3 to open and close are secured.

This operation is repeated until a large number of pieces of steel are brought close enough to maintain appropriate spacing necessary for heating. Therefore, steel slabs can be charged onto the rotary hearth to the full capacity of the heating furnace, that is, the full conveyance capacity.

Note that, since the lever 24 is exposed to high temperature in the heating furnace, if cooling water is allowed to flow through the lever 24 as described above, damage caused by high heat can be reduced.

On the other hand, when extracting the steel piece 2 from the heating furnace, the steel piece 2 is first held at the position indicated by the two-dot chain line, as shown in FIG. After the steel piece 2 has risen, the lever 24 is rotated, and the next steel piece 2b to be extracted is separated from the other steel pieces 2c as shown by the broken line. Rotary hearth 11
moves one pitch while extracting the currently gripped piece of steel 2, so the piece of steel 2b will be located directly below the claw body 3 when it is loaded again. Therefore, as described above, even if a large number of steel pieces 2 are placed close to each other on the rotary hearth 11, after the claw body 3 grips one steel piece 2, it will not move the next steel piece 2 to another. Since the steel pieces 2 are separated from each other, the steel pieces 2 can be extracted one after another without any trouble.

Note that although the lever 24 may be bent as shown in FIG. 6, it is better to have a straight shape as shown in this figure.

If the lever 24 is installed close to the claw body 3 as shown in FIG. 10, the steel piece 2 can be moved and extracted using a procedure different from that described above.

That is, when the claw body 3 is inserted into the extraction port, before the claw body 3 grips the steel piece 2d, the lever 24
moves the steel piece 2d directly below the claw body 3, and the steel pieces 2d and 2e on the rotary hearth 11 separate to enable the claw body 3 to open and close, so the claw body 3 descends. The opening allows the steel piece 2d to be gripped. Steel piece 2
While d is extracted outside the furnace, the rotary hearth 11
Because of the pitch movement, when the claw body 3 is inserted again, the steel piece 2e is at a position where the lever 24 can reach.

Therefore, even if a large number of steel slabs 2 being heated are placed close to each other on the rotary hearth 11 as shown in FIG. Extraction can be performed even though the body 3 is opened and closed.

Since the billet moving lever and its driving body as described above are simply attached to the claw support, they can be extremely easily installed in an existing billet loading/extracting device that does not have a lever. There are advantages that can be achieved.

As explained in detail above, the present invention has a lever mounting body attached to a claw support body to which a claw body is attached, and a lever drive body that remotely rotates the lever provided on this lever mounting body. The lever rotates before and after the claw body grips the steel piece, allowing one steel piece on the rotary hearth 11 to approach or move away from another steel piece. Therefore, more steel slabs can be charged into the heating furnace than before, improving the processing capacity of the heating furnace, and heating the steel slabs according to the capacity of the heating furnace, which reduces thermal energy. Consumption is low, fuel consumption rate is improved, and energy savings can be achieved.

[Brief explanation of the drawing]

Figure 1 is a plan view of a rotary hearth type heating furnace and a conventional billet charging/extracting device installed therein, Figure 2 is a front view of the billet charging/extracting device, and Figure 3 is the operation of the claw body. Explanatory drawings, FIG. 4 is a plan view of the billet charging and extraction device of the present invention, FIG. 5 is a view taken along the - arrow in FIG. 4, FIG. 6 is an example of a lever with a different shape, and FIG. A sectional view of the lever, FIG. 8 is an explanatory diagram of the movement of the steel piece according to a different embodiment, FIG. 9 is an explanatory diagram of the movement when extracting the steel piece, and FIG.
The figure is an explanatory diagram of movement during extraction of steel pieces according to different embodiments. 1... Heating furnace, 2... Steel billet, 3, 3A, 3B...
...Claw body, 4...Claw support, 11...Rotary hearth, 2
0... Steel billet charging and extraction device, 21... Lever mounting body, 24... Lever, 25... Lever driving body, 2
6...Inner tube.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A steel billet charging/extracting device provided with a claw body that can be opened and closed to grip the heated steel billet in order to charge and extract the heated steel billet into a rotary hearth type heating furnace, A lever mounting body is attached to the claw support body on which the body is attached, and a lever driving body is provided to remotely rotate the lever provided on the lever mounting body, and the lever is rotated before and after the claw body grips the steel piece. A billet charging/extracting device for a rotary hearth type heating furnace, characterized in that the billet charging/extracting device rotates to allow one billet on the rotary hearth to approach or move away from another billet. (2) The inside of the lever is formed in a double pipe structure,
A billet charging/extracting device for a rotary hearth type heating furnace according to claim 1, characterized in that cooling water can be supplied and recovered.