JPH069709U - Chamber used for non-oxidizing transport of hot rolled steel sheet - Google Patents

Abstract

(57) [Summary] [Purpose] The non-oxidizing chamber of hot-rolled steel sheet is divided into upper and lower parts to enable the opening and closing of the upper chamber quickly, and
The gobble pusher can be applied to efficiently discharge defective materials. Improves the sealability of the mating surfaces of the upper and lower chambers. [Constitution] The chamber 1 is divided into an upper chamber 1a and a lower chamber 1b. A gutter 2 containing water 3 is provided along the entire length of the upper end surface of the lower chamber 1b. The lower end surface of the upper chamber 1a is located in the water 3 contained in the trough 2, and there is no gap between the mating surfaces of the upper chamber 1a and the lower chamber 1b. The elevating mechanism 6 raises the upper chamber 1a, and then the gobble pusher 13 discharges the defective material 16.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a chamber used for non-oxidizing conveyance of hot rolled steel sheet.

[0002]

[Prior art]

 In hot rolling, for example, after heating the slab to a temperature at which it can be easily rolled in a heating furnace, the scale on the slab surface is removed, and then the slab is rolled by a rough rolling mill to perform a rough rolling treatment slab (commonly called "coarse bar"). That is). The rolled slab is transported to the finish rolling mill by a transport table having a chamber filled with an inert gas so that the surface of the rolled slab is not oxidized.

A conventional transfer table including a chamber has a problem in operation because the rapid opening and closing of the chamber is not taken into consideration. In other words, in the hot rolling process, rolling defects occur due to rolling failure at a certain frequency, but defective materials (commonly called "semi-finished products") must be quickly discharged and prepared for the next material. As a device for that purpose, a gobble pusher device for pushing semi-finished products out of the line is attached. FIG. 4 is a front view illustrating the structure of the gobble pusher device. As shown in FIG. 4, the gobble pusher device 10 includes a gobble pusher 13 located between the transfer rolls 11 connected to a gobble pusher drive hydraulic cylinder 12 provided outside the line where the transfer rolls 11 are arranged. It has a function of pushing the semi-finished product (defective material) 16 toward the semi-finished product cradle 15 on the opposite side of the hydraulic cylinder 12. 18 is a gobble pusher receiving roller.

[0004]

[Problems to be solved by the device]

 However, since the transfer table is covered by the chamber, there is a problem that the chamber must be disassembled and removed in order to operate the gobble pusher.

The following techniques have been disclosed as non-oxidizing transport techniques for hot-rolled steel sheets. Conveying device for hot steel strip: Japanese Utility Model Laid-Open No. 62-131709. In hot rolling, a chamber (casing = non-oxidizing cover) surrounding the conveying device is provided, and an inert gas is filled in the chamber to prevent the oxidation of the surface of the hot steel billet (hereinafter, "Prior art 1").

Prior art 1 has a chamber divided into upper and lower parts, but does not have a mechanism for promptly lifting the upper chamber. Moreover, there is no clear disclosure about the method of sealing the mating surfaces of the upper and lower chambers.

According to the experiments by the inventors, in the chamber in the non-oxidizing conveyance of the hot rolled steel sheet, the gap between the mating surfaces of the upper and lower chambers must be suppressed to 1 mm or less as shown in FIG. Due to the draft, the oxygen concentration in the inert gas atmosphere in the chamber rises sharply, and as shown in FIG. 6, the scale suppression effect can hardly be expected. Figure 5 is a graph showing the effect of the gap between the mating surfaces of the upper and lower chambers on the oxygen concentration in the inert gas atmosphere in the chamber. Figure 6 is the effect of the oxygen concentration in the inert gas atmosphere in the chamber on the scale thickness. It is a graph which shows. The experimental conditions were as follows. Composition of nitrogen (N ₂ ) gas enclosed in the chamber; 97.5% N ₂ , 2.5% O ₂ , input amount of nitrogen (N ₂ ) gas enclosed in the chamber; 580 Nm ³ / Hr unit ・ 1 unit is 6 m line length . Gap between mating surfaces of upper and lower chambers; 0.06 m ² .

Metal material transport table: Japanese Patent Laid-Open No. 63-112014. It is provided with a table roll arranged along a transport path for transporting the metal material, and a plurality of spray members for spraying an inert gas toward the metal material transported on the table roll. They are arranged in a plurality of rows extending along the material conveying path (hereinafter referred to as "prior art 2").

The prior art 2 is intended to suppress the oxidation only by injecting an inert gas without providing a chamber, but according to the experiments conducted by the inventors, a very large amount of the inert gas is required. It has the drawback of The absence of a chamber is convenient for removing semi-finished products with a gobble pusher, but due to the above-mentioned drawbacks, Prior Art 2 is not practical.

Method for preventing scale generation in hot rolled steel strip: JP-A-59-19018. By forming an airtight chamber by a water curtain flow over the entire length of the hot run table and supplying an inert gas to this airtight chamber, rusting of the hot strip and growth of rust are prevented (hereinafter referred to as "Prior Art 3"). ).

In the prior art 3, the airtight chamber is formed by the water curtain flow, and the inert gas is filled therein to suppress the scale, and there is no interference between the airtight chamber and the gobble pusher. However, as mentioned above, even with the mating surfaces of the upper and lower chambers, a gap of 1 mm or less can be tolerated, so the effect of airtightness is expected unless the water curtain is completely uniform and continuous. Can not.

Further, water vapor exhibits an oxidizability as high as oxygen at a high temperature. The inventors investigated the effects of various gases on the oxidation of metallic materials. FIG. 7 is a graph showing the relationship between the thickness of the iron oxide film and the oxidation time when acom iron was heated to 1000 ° C. and oxidized in steam, oxygen, air (atmosphere) or carbon dioxide gas. . As shown in FIG. 7, it can be seen that water vapor shows an oxidizability comparable to that of oxygen at high temperatures. Therefore, even if the airtight chamber is filled with the inert gas as in the prior art 3, the water vapor significantly destroys the effect of suppressing oxidation, and the scale removing ability is greatly reduced.

Method for suppressing scale of hot rolled steel strip: JP-A-61-123403. Scale control of hot-rolled steel sheet is suppressed by covering the set area of the measuring machine near the exit side of the final stand of the finishing rolling mill with a container to create a high-pressure non-oxidizing atmosphere and cooling the steel strip from this container to a specific temperature. Perform efficiently and inexpensively (hereinafter referred to as "Prior Art 4").

Cooling method for hot-rolled steel strip: JP-A-59-97710. By performing the water cooling process, hot finishing process, winding process, and slow cooling process of the steel strip in an inert gas atmosphere, and by using deoxidized water as cooling water for the rolling rolls and steel strip, Prevents the occurrence of scale on the surface of the rolled steel strip (hereinafter referred to as "prior art 5").

Prior arts 4 and 5 do not describe the specific structure of the chamber, and neither disclose nor suggest the division of the chamber into upper and lower halves, and quick opening and closing.

Therefore, the object of the present invention is to divide the chamber, to quickly open and close the upper chamber, to efficiently apply the gobble pusher, and to improve the sealing property between the upper and lower mating surfaces. An object is to provide an excellent chamber for non-oxidizing transport of hot-rolled steel sheet.

[0017]

[Means for Solving the Problems]

 The present invention is directed to the oxidation-free transport of hot-rolled steel sheets for covering the hot-rolled steel sheets moving on the transport rolls, which are provided around the transport rolls arranged along the hot-rolled steel sheet transport path. In the chamber to be used, the chamber is divided into an upper chamber and a lower chamber by dividing the chamber into upper and lower chambers, and an upper and lower mechanism provided outside the transport roll supports the upper chamber so as to be vertically movable. A gutter is provided over the entire length of the upper end surface of the chamber, the lower end surface of the upper chamber is positioned in the water contained in the gutter, and the mating surface of the upper chamber and the lower chamber is sealed with a water seal. It has characteristics.

[0018]

[Action]

 At the position below the pass line of the transfer table, the chamber is divided into two parts, the upper chamber and the lower chamber, so that the upper chamber can be moved up and down. It never happens. Further, since the elevating mechanism having the drive source is provided to raise the upper chamber, the upper chamber can be raised easily and quickly. In addition, for the most important control of material oxidation in non-oxidizing transport, use a water seal with water contained in a gutter installed along the entire length of the upper end of the upper chamber for the mating surfaces of the upper and lower chambers. Then, the gap between the mating surfaces becomes less than 1 mm, and the inert gas sealed in the chamber is sealed without leakage.

Next, the invention will be described with reference to the drawings. 1 and 2 show one embodiment of the present invention. FIG. 1 is a front sectional view of a chamber of the present invention, and FIG. 2 is a sectional view showing a water sealing part of a mating surface of an upper chamber and a lower chamber. is there.

As shown in FIGS. 1 and 2, the chamber 1 is divided into an upper chamber 1a and a lower chamber 1b. The position of the mating surface between the upper chamber 1a and the lower chamber 1b is set to a position lower than the pass line 17 through which the material (semi-finished product) 16 passes. A gutter 2 is provided over the entire length of the upper end surface of the lower chamber 1b. The gutter 2 contains water 3. On the outside of the gutter 2, an auxiliary gutter 4 is provided for discharging the water overflowed and overflowed from the gutter 2. The lower end surface of the upper chamber 1a is located in the water contained in the gutter 2 over its entire length. Therefore, there is no gap between the mating surfaces of the upper chamber 1a and the lower chamber 1b. That is, the allowable clearance is set within 1 mm or less without any problem.

The water 3 for water sealing contained in the gutter 2 is always overflowed to flow out to the auxiliary gutter 4 so as to maintain a constant water level. The reason why the auxiliary gutter 4 is not allowed to overflow into the inside of the gutter 2 is to avoid the influence of strong oxidation by steam as described above.

An elevating mechanism 6 is provided outside the chamber 1. The elevating mechanism 6 includes an elevating guide post 7 standing upright on the concrete frame 5, an upper chamber elevating hydraulic cylinder 8, and an elevating body 9 that can be moved up and down along the guide post 7 by the action of the hydraulic cylinder 8. It consists of The lifting body 9 is attached to the upper surface of the upper chamber 1a. The upper chamber 1a can be raised and lowered by the action of the raising and lowering mechanism 6 configured as described above. The drive source of the lifting mechanism may be an electric power cylinder or a rack and pinion instead of the hydraulic cylinder.

The gobble pusher device 10 is the same device as shown in FIG. The gobble pusher 13 provided between the transport rolls 11 in the same direction as the axial direction of the transport rolls 11 is located below the pass line 17. A pusher claw 14 is provided on the upper surface of the gobble pusher 13, and the upper end of the claw 14 projects upward from the pass line 17. One end of the gobble pusher 13 is connected to a gobble pusher drive hydraulic cylinder 12 provided outside the chamber 1. By operating the hydraulic cylinder 12, the gobble pusher 13 and the claw 14 move toward the semi-finished product cradle 15. To do. 18 is a gobble pusher receiving roller. When the gobble pusher 13 moves toward the semi-finished product cradle 15, the semi-finished product 16 on the transport roll 11 is pushed toward the semi-finished product cradle 15 by the claw 14.

In this way, if the work of pushing out the semi-finished product 16 is performed after the upper chamber 1a is raised by the elevating mechanism 6, the upper chamber 1a does not interfere with the pushing out. Since the upper chamber 1a is guided by the guide post 7 and can be quickly moved up and down by the hydraulic cylinder 8, this operation is performed in an extremely short time.

FIG. 3 is a front sectional view showing another embodiment of the lifting mechanism for the upper chamber 1a. A pillar 19 is erected on the concrete stand 5, and a hydraulic cylinder 20 is attached to the upper portion of the pillar 19. Furthermore, an upper chamber 1a is attached to the lifting hydraulic cylinder 20. The upper chamber 1a is pin-connected to the side where the lifting hydraulic cylinder 20 is located. 21 is a pin coupling part. The lift hydraulic cylinder 20 is operated to raise only one side of the upper chamber 1a with the pin coupling portion 21 as a fulcrum to open the discharge side of the semi-finished product and discharge the semi-finished product.

Further, as the object of the oxidation suppression, not only steel plates but also steel materials such as shaped steels, and in terms of materials, general metals such as aluminum, titanium, etc. in which oxidative wear is a problem, The device of the present invention is applicable.

[0027]

[Effect of device]

 As described above, according to the present invention, the sealing property of the mating surfaces of the two divided chambers is extremely good, and a relatively small amount of inert gas is used, and not only hot-rolled steel sheets but also high-temperature metal in hot-rolling equipment can be used. It is possible to suppress the oxidation of the material, to discharge the defective rolling material quickly, and to perform it without any human labor, which is an industrially useful effect.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of a chamber of the present invention.

FIG. 2 is a cross-sectional view showing a water sealing part on a mating surface of an upper chamber and a lower chamber.

FIG. 3 is a front sectional view showing another embodiment of the lifting mechanism for the upper chamber 1a.

FIG. 4 is a front view illustrating the structure of a gobble pusher device.

FIG. 5 is a graph showing the effect of the gap between the mating surfaces of the upper and lower chambers on the oxygen concentration in the inert gas atmosphere in the chamber.

FIG. 6 is a graph showing the effect of oxygen concentration in an inert gas atmosphere in the chamber on scale thickness.

FIG. 7 is a graph showing the relationship between iron oxide film thickness and oxidation time when acom iron is heated to 1000 ° C. and oxidized in each gas of steam, oxygen, air (atmosphere) or carbon dioxide. .

[Explanation of symbols]

 1 chamber 1a upper chamber 1b lower chamber 2 gutter 3 water 4 auxiliary gutter 5 concrete pedestal 6 lifting mechanism 7 lifting guide post 8 upper chamber lifting hydraulic cylinder 9 lifting body 10 gobble pusher device 11 transfer roll 12 gobble pusher drive hydraulic cylinder 13 Gobble pusher 14 Claw 15 Semi-finished product cradle 16 Semi-finished product (defective material) 17 Pass line 18 Gobble pusher receiving roller 19 Pillar 20 Lifting hydraulic cylinder 21 Pin connection part.

Claims (1)

[Scope of utility model registration request] 1. Used for non-oxidizing conveyance of a hot-rolled steel sheet for covering the hot-rolled steel sheet which is provided on the conveyance roll and is arranged along a conveyance path of the hot-rolled steel sheet and which moves on the conveyance roll. In the chamber, the chamber is divided into an upper chamber and a lower chamber by dividing the chamber into upper and lower halves, and the upper chamber is movably supported by an elevating mechanism provided outside the transfer roll. Is provided with a gutter over the entire length thereof, the lower end surface of the upper chamber is positioned in the water contained in the gutter, and the mating surface of the upper chamber and the lower chamber is sealed with a water seal. Chamber used for non-oxidizing transport of steel sheets.