JP2000055565A - Heating furnace having moving hearth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating furnace having a moving hearth in which skid rails acting as composing material for a movable hearth and a fixed hearth can be endured against a long-term usage without showing any local wearing, an amount of usage of the skid rails is small and a loss of heat removed through a water-cooled pipe is low. SOLUTION: In a heating furnace having a movable hearth in which at movable hearth and a fixed hearth provided with water-cooled pipes having skid rails for supporting material are applied as an inter-furnace transporting device and the materials supported on the fixed hearth are transported intermittently at a predetermined transporting stroke S under an upward or downward motion and a forward or rearward motion of the movable hearth and heated, the skid rails 16 having a length L capable of supporting one piece of material W are fixed to a water-cooled pipe 15 in a fixing pitch P in a furnace length direction which is equal to the transporting stroke S so as to cause the material W to be supported within a range of the length L of the skid rails 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a moving hearth type heating furnace such as a walking beam type heating furnace and a walking hearth type heating furnace.

[0002]

2. Description of the Related Art A moving hearth type heating furnace such as a walking beam type heating furnace or a walking hearth type heating furnace has a movable hearth and a fixed hearth as a furnace transfer device.
Heating is performed while the material supported on the fixed hearth is intermittently conveyed by a predetermined conveyance stroke by the vertical and vertical movements of the movable hearth.

[0003] As a movable hearth and a fixed hearth,
Generally, as shown in the example of a walking beam type heating furnace in FIG. 8, a water cooling pipe 1 through which cooling water flows to prevent overheating.
A movable beam 42 or a fixed beam 43, which has a short skid rail 41 for supporting a material attached thereto by welding or the like and is entirely covered with the refractory 18 except for the head of the skid rail 41, is used.

[0004]

However, conventionally, FIG.
The mounting pitch P of the skid rail 41 in the material W
And a large number of the skid rails 41 are arranged in a dense state so that the clearance between the skid rails 41 is small (for example, 20 to 30 mm). The surface pressure of the part and the rear corner becomes excessive and wears out locally, so that it cannot withstand long-term use, and may cause the material to fall over. There are many problems, such as bulkiness and a large heat loss due to the water cooling tube 15 via the skid rail 41.

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned conventional problems, and the skid rail which is a constituent material of the movable hearth and the fixed hearth can be used for a long time without being locally worn, and can be used for a long time. It is an object of the present invention to provide a moving hearth type heating furnace in which the amount of water used and the heat loss due to a water cooling tube can be reduced.

[0006]

According to a first aspect of the present invention, there is provided a moving hearth type heating furnace, wherein a movable hearth provided with a water-cooled tube having a skid rail for material support and a fixed hearth are transferred in the furnace. A moving hearth type heating furnace which has as a device and heats while intermittently conveying a material supported on a fixed hearth by a predetermined conveying stroke by moving the movable hearth up and down and back and forth; The skid rail having a length that can be supported is mounted on the water cooling tube at a mounting pitch in a furnace length direction equal to the transfer stroke, so that the material is supported within the length of the skid rail. It is characterized by.

A moving hearth type heating furnace according to a second aspect of the present invention has a movable hearth provided with a water cooling tube to which a skid rail for material support is attached and a fixed hearth as a furnace transfer device. In a moving hearth type heating furnace that performs heating while intermittently conveying a material supported on a fixed hearth by a vertical hearth movement and back and forth movement in a predetermined conveyance stroke, the heating hearth is located at a position separated by the conveyance stroke. The skid rail having a length capable of supporting the two materials at the same time,
It is characterized in that the material is mounted on the water cooling tube at a mounting pitch in a furnace length direction equal to twice the transfer stroke, so that the material is supported within the length of the skid rail.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. In FIGS. 1 and 2, reference numeral 1 denotes a side discharge type walking beam heating furnace, 2 denotes a furnace body, 3 denotes a material charging port, and 4 denotes a material extraction port. Reference numeral 5 denotes a movable beam (movable hearth) constituting the in-furnace transfer device, and reference numeral 6 denotes a fixed beam (fixed hearth).
The movable beam 5 is fixed to a drive stand 8 by a column 7, and the fixed beam 6 is fixed to a furnace bottom 9 by a column not shown.

The drive base 8 is driven up and down and back and forth by a well-known mechanism to repeat a rectangular or elliptical motion cycle. With the movable beam 5 driven by the drive table 8, the material W loaded from the material loading port 3 is sequentially transferred forward on the fixed beam 6 by a predetermined transport stroke S, and is moved to the material extraction port 4. It is conveyed toward.

Reference numeral 11 denotes a charging roller for charging a material;
Is an extraction roller for extracting the material, and the extraction roller 12 can enter the furnace only at the time of extraction, but its detailed illustration is omitted. As shown in FIG. 2, in this example, the movable beam 5 and the fixed beam 6 have a bent portion G inclined at a small angle in the horizontal plane, thereby reducing the skid mark generated at the bottom of the material. I am wearing it.

The movable beam 5 and the fixed beam 6 are shown in FIG.
5 has the same structure, and a skid rail 1 is provided above a water cooling pipe 15 made of steel pipe through which cooling water flows.
6 are mounted by welding at a mounting pitch P in the furnace length direction equal to the transport stroke S of the material W. Reference numeral 16a denotes a saddle serving as a base of the skid rail 16, which is welded to the water cooling tube 15, and 16b denotes a skid body welded thereon. The length L of the skid body 16b in the furnace length direction supports one material W. The possible length, ie, the width T of the material W in the furnace length direction + the extra dimension (for example, 20 to 30 mm). In this example, the center Q of the length L of the skid rail 16 (specifically, the skid body 16b) is the center of the support position of the material W on the movable and fixed beams by the walking operation (that is, the center of the width T of the material W) R The skid rail 16 is attached to the water cooling tube 15 so that

Reference numeral 17 denotes an auxiliary skid which is provided in advance as necessary, for example, to prevent overturning of the material W when the material W is excessively bent during the transfer in the furnace.
It is welded to the water cooling tube 15 at the middle part between 6 and 16. Since the auxiliary skid 17 does not always hold the material W, the skid body 1 of the skid rail 16
6b, an inexpensive material having low heat resistance and low wear resistance may be used. Reference numeral 18 denotes a refractory which covers the respective parts except for the heads of the skid rail 16 and the auxiliary skid 17, prevents the temperature rise and oxidation of the respective parts, and suppresses the heat loss due to the water cooling tube 15.

[0013] The walking beam type heating furnace 1 having the above configuration.
In the above, the material W is loaded from the material loading port 3 onto the loading roller 11, and the movable beam 5 is moved up and down and back and forth to transport the material W intermittently forward with the transport stroke S and provided on the furnace wall. The material W is heated by a burner (not shown).

Material W of movable beam 5 and fixed beam 6
Since the skid rail 16 is present at the support position and the material W is supported within the range of the length L of the skid rail 16, the front corner and the rear corner of the skid rail 16 are locally worn. No problem, and the upper surface is worn almost uniformly, so that it can withstand long-term use. In addition, since the skid rails 16 need only be provided at the material support positions, the amount of the skid rails 16 made of an expensive heat-resistant and abrasion-resistant material can be reduced, and the heat is removed by the water cooling tube 15 via the skid rails 16. Less heat loss is required.

In this example, since the center Q of the length L of the skid rail 16 coincides with the center R of the material supporting position on the movable beam 5 and the fixed beam 6, the front and rear sides of the material W are also provided. Although the skid rail 16 extends and the material W is securely supported within the range of the length L of the skid rail 16, as long as the material W does not protrude from the front end or the rear end of the skid rail 16, Center Q
May be eccentric to the front side or the rear side with respect to the support position center R.

FIG. 6 shows a second embodiment of the present invention, in which two adjacent skid rails 1 shown in FIG.
6 are attached to the water cooling tube 15 as a longer skid rail 26 than that of FIG. 4, and the movable beam 21 and the fixed beam 22 are formed by using the auxiliary skid 17 and the refractory 18 similar to FIG. The other configuration of the entire furnace is the same as that of the first example.

The length M of the skid rail 26 is equal to the transport stroke S + the width T of the material W so that two materials W separated by the transport stroke S can be supported at the same time.
+ Extra dimension (for example, 20 to 30 mm). The skid rail 26 has a center N having a length M coincident with the center O of the supporting positions R of the two adjacent materials W, and a mounting pitch in the furnace length direction equal to twice the transport stroke S. At P ', it is attached to the water cooling tube 15 by welding.

The skid rail 26 has a cross section similar to that of the skid rail 16 of the first embodiment, and comprises a saddle 26a welded to the water cooling tube 15 and a skid main body 26b welded thereon. In addition, instead of this saddle 26a,
Using two short saddles 16a of FIG. 4 in the same arrangement as in FIG.
It may be welded over the skid body 26b.

In the movable beam 21 and the fixed beam 22 of this example, the skid rail 16 in the first example is lengthened by the transport stroke S so that two materials W are supported by one skid rail 26. Others have the same configuration as the first example, and the material W is a skid rail 2
6 is supported within the range of length M, and the front corner and the rear corner of the skid rail 26 are not locally worn, and the bearing surface is almost uniformly worn. Also, compared to the conventional arrangement in which the skid rails are densely arranged, the usage amount of the skid rails and the heat loss due to the water cooling tube 15 can be reduced.

The present invention is not limited to the above examples. For example, the specific structure of the skid rails 16 and 26, and the arrangement and specific structure of the movable beam and the fixed beam in the furnace are other than those described above. Is also good. In addition, one of the movable beam and the fixed beam has the structure of the first example,
The other may have the structure of the second example.

The present invention can also be applied to a walking beam type heating furnace other than the side discharge type,
Further, as shown in FIG. 7, the present invention can be applied to a walking hearth type heating furnace 30 having a movable hearth 31 and a fixed hearth 32 provided with a water cooling tube 35 to which a skid rail 36 is attached as a furnace transfer device. Things.

[0022]

As described above, according to the present invention,
The skid rails are locally worn because there are skid rails at the material supporting positions of the movable hearth and the fixed hearth that transport the material in the furnace, and the material is supported within the length of the skid rails. The bearing surface wears out almost uniformly without endurance, so it can withstand long-term use.Since it is arranged at intervals, the use of expensive heat-resistant material skid rails can be reduced, reducing equipment and repair costs. Can be
Further, the heat loss due to the water cooling tube via the skid rail can be reduced, and the operating cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic vertical sectional view of a walking beam type heating furnace showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged plan view of main parts of a movable beam and a fixed beam in FIG. 2 (however, a state where a refractory is removed).

FIG. 4 is an enlarged side view taken along a line BB in FIG. 3 (however, a refractory is cut away).

FIG. 5 is a sectional view taken along line CC of FIG. 4;

FIG. 6 is a diagram corresponding to FIG. 4, showing a second example of the embodiment of the present invention.

FIG. 7 is a cross-sectional view showing an example of a walking hearth heating furnace to which the present invention is applied.

FIG. 8 is a diagram corresponding to FIG. 4, showing an example of a conventional walking beam.

[Explanation of symbols]

1 ... walking beam type heating furnace, 5 ... movable beam, 6
... fixed beam, 15 ... water cooling tube, 16 ... skid rail,
21: movable beam, 22: fixed beam, 26: skid rail, 30: walking hearth heating furnace, 35: water cooling tube, 36: skid rail.

Claims (2)

[Claims] A movable hearth provided with a water cooling tube to which a skid rail for material support is attached and a fixed hearth as an in-furnace transfer device, and the movable hearth is supported on the fixed hearth by moving up and down and back and forth. In a moving hearth type heating furnace that performs heating while intermittently transporting the material that has been transported at a predetermined transport stroke, the skid rail having a length capable of supporting one of the materials is moved in a furnace length direction equal to the transport stroke. A movable hearth heating furnace, wherein the material is supported within the length of the skid rail by being attached to the water cooling tube at an installation pitch of: 2. A movable hearth provided with a water cooling tube to which a skid rail for material support is attached and a fixed hearth as an in-furnace transfer device, and the movable hearth is supported on the fixed hearth by moving up and down and back and forth. In a moving hearth type heating furnace which heats while transporting the material intermittently at a predetermined transport stroke, the skid having a length capable of simultaneously supporting two of the materials at positions separated by the transport stroke. A rail is mounted on the water-cooled tube at a mounting pitch in a furnace length direction equal to twice the transport stroke, so that the material is supported within the length of the skid rail. Hearth heating furnace.