JPS62238335A - Meandering preventing device for metallic belt-like material in floating type heat treatment furnace - Google Patents

Abstract

PURPOSE:To automatically prevent the meandering of a metallic belt-like material in a floating furnace by injecting gas laterally and vertically from injection ports of injection nozzles which are disposed to face a conveying passage for the metallic belt-like material and have suitable angles of inclination. CONSTITUTION:A strip 6 is passed in the state of floating the same by the floating nozzles 4 in the floating furnace 1 consisting of a heating chamber 2 provided with a heating source 5 and a cooling chamber 3 provided with a circulation fan 23 and a cooler 24 and is thereby heat-treated. The injection nozzles 7B, 7B' attached to a pair of right and left frames 7 so as to face the conveying passage for the strip 6 are disposed to face each other at the same angle of inclination relative to the center line in the conveying direction above and below the above-mentioned strip in the floating furnace 1. Ejection ports 8, 8' provided longitudinally thereto are disposed to point the strip 6 diagonally backward a a suitable grading angle. The gaseous substance is injected at all times from the ports 8, 8' to the strip 6. The injection force of the gaseous substance changes according to the injection area to automatically correct the meandering of the strip 6. The generation of meandering thereof is thus prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a device for preventing meandering of a metal strip in a floating heat treatment furnace, and more specifically to a meandering detection function. The present invention relates to a meandering prevention device having a meandering prevention function (sensor function) and a meandering correction function (centering function).

[Conventional technology]

In general, a floating heat treatment furnace is usually used as a device for subjecting metal strips to heat treatment such as annealing6. In such floating heat treatment furnaces, gold F7A strips are floated and Due to the fact that metal strips are conveyed through the furnace in a state of
9 For example, as shown in FIG. 9, a method for preventing the meandering of the strip 1 is to place a light source and a light sensor C facing each other with a conveyance path for the metal strip a placed between them.
By replacing the amount of lateral displacement caused by the meandering of the metal strip a with the amount of electricity output by the optical sensor C, the meandering of the metal strip a is detected, and in conjunction with the optical sensor C. A steering roll d is mounted horizontally so that its tilting angle can be freely adjusted, and the tilting angle of the steering roll d is changed in accordance with the meandering direction of the metal strip material (strip) a. A method of correcting the meandering of lip a) is generally used.

[Problem that the invention seeks to solve]

However, the first problem with the meandering prevention device for metal strips as described above is that the device cannot be installed inside a furnace. In other words, in addition to using an optical sensor as a meandering detection mechanism, the steering roll is brought into direct contact with the metal strip to correct the meandering. The problem is that the centering device cannot be used in a floating furnace where heat treatment is performed. In this way, since the centering device cannot be installed inside the furnace, in a floating furnace where the conveyance distance is long,
This results in a problem in that it is not possible to accurately correct the position of the meandering within the reactor.

Moreover, in addition to the fact that the meandering detection mechanism and meandering correction mechanism must be installed separately, a second problem arises in that a control mechanism for interlocking both mechanisms must be provided separately. .

The present invention is an attempt to improve the conventional problems as described in L, and the present invention is to solve the problem of enabling use in a non-contact state in a furnace. There are problems. That is, the present invention provides a pair of left and right jet ports that constantly inject a gas to a metal band-shaped material (strip), and responds to changes in the jet width dimension of the jet ports to the meandering metal belt-shaped material (strip). The jetting force is automatically changed to automatically correct the meandering of the metal strip in a non-contact manner in the furnace, The specific means and effects are as follows.

[Means for solving problems]

(2) A pair of left and right injection nozzles that constantly inject a gas into the conveyance path of the metal strip material are arranged facing each other at the same angle of inclination with respect to the center line in the conveyance direction.

(D) The jet ports of both jet nozzles are opened with an appropriate width dimension along the longitudinal direction of the jet nozzle, and the jet ports have an appropriate slope angle with respect to the metal strip. The opening is opened diagonally rearward with respect to the conveying direction of the metal band material (strip).

[For production]

■ When the metal strip is being conveyed under normal conditions, the left and right jet ports should be facing the conveying direction of the metal strip and having the same jetting width (i.e., the same jetting area). ), a state is obtained in which the gas body is injected. In this way, by injecting the gas body with the same injection area on the left and right sides, the same resistance force is generated on the left and right sides by the injection force of the same gas body, and in a state where both resistance forces are balanced, the metal strip material (strip ) is transported.

■ If a meandering occurs in the metal strip (strip), the jet width of one spout facing the metal strip (strip) at the jet nozzle placed on the meandering side will be large. (i.e., the injection area of the gas body becomes wider)
At the same time, the jetting force of the gas body becomes stronger in accordance with the change in area, while the jetting width of the jetting port disposed on the opposite side becomes smaller and the jetting force becomes weaker. In this way, the jetting force of the jetting nozzle placed on the meandering side becomes stronger than the jetting force of the jetting nozzle placed on the opposite side, resulting in a resistance due to the jetting force in the direction facing the meandering metal strip. is generated, and the resultant force of this resistance force and the inertial force of the metal strip (strip) provides the effect of returning the metal strip (strip) to its normal position.

〔Example〕

Specific embodiments of the present invention will be described below with reference to illustrative drawings.

In each of the drawings shown in FIGS. 1 to 3, reference numeral 1 indicates a static pressure pad type floating furnace (heat treatment furnace). In the blotting furnace 1, 2 is a heating chamber, 3 is a cooling chamber provided adjacent to the heating chamber 2, and the heating chamber 2 and the cooling chamber 3 are provided with a conveyance path for a metal strip 6. is provided through it, and a pair of upper and lower float nozzles (external pressure pads) 4, 4 are provided with the same conveyance passage in between.
are arranged facing each other at regular intervals, and the same float nozzles 4.4
It is provided so that the metal strip 6 can be levitated via the gas jetted out. Further, heating sources 5 such as heaters or radiant tube burners are arranged at appropriate intervals in the heating chamber 2, and the metal strips 6 can be heated by the heating sources 5. A circulation fan 23 is attached to the upper end of the circulation fan 23.
A cooler 24 is installed facing the cooler 2.
4 is provided so that the metal strip 6 can be cooled. Furthermore, in the heating chamber 2 (or cooling chamber 3), a meandering prevention device 7 for preventing the meandering of the metal strip 6 is installed at the upper and lower positions with the metal strip 6 in between. They are placed opposite each other. Further, 10 indicates an introduction roll, and 11 indicates a delivery roll.

In the meandering prevention device 7 described above, the meandering prevention device 7 includes a pair of left and right flares A7A, 7A located on both sides of the metal strip 6 and extending in the front-rear direction;
Existing between both frames 7A, 7A, approximately A in the conveyance direction
A plurality of upper and lower injection nozzles 7B that are bent into a letter shape.
, 7B'. More specifically, the injection nozzle 7B.

7B' has the same inclination angle with respect to the center line in the conveying direction of the metal strip 6, and both frames 7A, 7
The spray nozzles 7B and 7B' respectively face the surface of the metal strip 6, and the spray nozzles 7B' face the back surface of the metal strip 6. It is set up as follows. And each injection nozzle 7B.

7B' has a pair of left and right nozzles 8.8.8' and 8' extending in the longitudinal direction, respectively.
．． 8. 8', 8' are opened rearward, facing the direction of conveyance of the metal strip 6. More specifically, the spout ports 8, 8, 8', and 8' are arranged in a staggered manner so as to face both the front and back surfaces of the metal strip 6 at an acute angle of inclination. It will be done. Additionally, a blower (not shown) is connected to the meandering prevention device 7, and the gas supplied from the blower can be constantly blown out toward the metal strip 6. It is set up as follows.

Next, its effect will be explained.

By supplying the gas to the injection nozzles 7B, 7B' via the blower, the gas is supplied to the metal strip-shaped material (
A state is obtained in which the spray is constantly sprayed diagonally rearward, opposite to the conveyance direction of the strip) 6. In this way, a pair of left and right spout ports 8, 8 are provided for the metal strip 6.
(and 8'.

8'), by constantly injecting the gas body diagonally backward, facing the direction of conveyance, the resistance force R1 due to the jetting force of the gas body against the inertial force F of the metal strip 6 is increased. R2 is generated, but the metal strip material (
When the strip) 6 is being conveyed in a normal condition, the same width dimension is ejected from the left and right pair of ejection ports 8° 8 (and 8', 8') to the same metal strip (strip) 6. The gas is injected through [the width dimension of the ejection ports 8, 8 (and 8', 8') in the portion facing the metal band-shaped material (strip) 6]. That is, the gas body is injected onto the metal strip 6 with the same injection area on the left and right sides, and the same resistance force R1 and resistance R2 act on the metal strip 6. The state is obtained. And gold fil like this? By applying the same resistance force R1 and resistance force R2 to the iF-shaped material (strip) 6, the components of the resistance forces R1 and R2 in the plate width direction are balanced, and the resultant force R is applied to the metal strip material (strip). )6
The metal band material (strip) 6 is conveyed while maintaining its normal state by the resultant force P of the inertial force F and the inertial force F.

When the metal 'IfF-like material (strip) 6 meanders, for example, to the left with respect to the conveyance direction, one of the left and right pair of ejection ports 8, 8 (and 8', 8') is arranged in the meandering direction. The jet width dimension of the jet nozzle 8 (and 8') [the jet width of the part facing the metal strip 6]
width dimension] of the other spout 8 (and 8')
) is larger than the jet width dimension [the width dimension of the jet nozzle 8 (and 8') in the part facing the metal strip 6], but the jet nozzle 8 (and 8') arranged in the meandering direction in this way is and 8') are larger than the jet width of the jet ports 8 (and 8') disposed on the opposite side. A state is obtained in which the magnitude of the resistance force changes in correspondence with the jet width dimension. That is, a state is obtained in which the resistance force R2 due to the injection force of the injection ports 8 (and 8') arranged in the meandering direction is larger than the resistance force R1 due to the injection force of the injection ports 8 (and 8'') arranged on the opposite side. As the resistance force R2 becomes larger than the resistance force R1 in this way, the resultant force R is opposed to the inertial force F acting in the conveying direction of the meandering metal strip 6. The resultant force P is generated by the resultant force R and the inertial force F, and the resultant force P gradually corrects the meandering of the metal strip 6. That is, the resultant force P are the component force P1 acting in the conveying direction of the gold JiA'!jF-shaped material (strip) 6 in a normal state, and the component force P2 acting rightward in the direction of both wheels of the same metal strip material (strip) 6. This component force P can be decomposed into
2 provides the effect of returning the metal strip 6 to its normal position.

In addition, if the metal band material (strip) 6 meanders, for example, to the right with respect to the conveyance direction, each spout 8 (and 8°
) of the jet nozzles 8 (and 8') arranged in the meandering direction in response to changes in the jet width dimension [width dimension of the jet nozzles 8 (and 8') in the portion facing the metal strip 6]. A state is obtained in which the resistance force R1 due to the injection force is larger than the resistance force R2 due to the injection force of the injection ports 8 (and 8') disposed on the opposite side. And in this way, the resistance force R is greater than the resistance force R1.
2 is larger, the resultant force R acts in a backward direction in opposition to the inertial force F acting in the conveying direction of the meandering metal strip 6, and the resultant force R and A resultant force P is generated by the inertial force F, and the resultant force P has the effect of gradually correcting the meandering of the metal strip 6.

〔Effect of the invention〕

The present invention is constructed as described above.

As described above, a pair of left and right injection nozzles are disposed facing the conveyance path of the metal band material (strip) at the same angle of inclination with respect to the center line in the conveyance direction, and the injection nozzles of both injection nozzles are By opening the outlet diagonally backward with respect to the conveyance direction of the metal strip material (strip) along the longitudinal direction of the injection nozzle, the metal strip material (strip) is By constantly injecting gas at an appropriate inclination angle and correcting the meandering by the injection force that acts in response to changes in the injection width, it can be used in a non-contact manner in the furnace. Meandering detection mechanism (sensor mechanism)
It has now become possible to obtain a meandering prevention device that is unnecessary. In other words, the metal strip material (
This made it possible to prevent the strip from meandering.

[Brief explanation of drawings]

FIG. 1 is an overall sectional view of a floating furnace equipped with a meandering prevention device for metal strip material according to the present invention. Fig. 2 is a plan view of the meandering prevention device, Fig. 3 is a sectional view taken along the line A of the meandering device, Figs. The figure is an explanatory diagram showing the principle of action during meandering. Further, FIG. 9 is a sectional view of a portion (rear end portion) of a floating furnace equipped with a meandering prevention device of a conventional structure. 1...Floating furnace, 2...Heating chamber, 3...
Cooling chamber, 4... Float nozzle, 5... Heating source, 6
... Metal band material (strip), 7 ... Meandering prevention device, 7A ... Frame, 7B, 7B' ... Spray nozzle, 8.8' ... Spray 0.10 ... Introduction roll ,
11... Feeding roll, 23... Circulation fan, 2
4... Cooler. Figure 2 Figure 6 Figure 7 Figure 8 P2 Go to 5. May 15, 1985 1. Display of the incident 1988 Patent Application No. 80,436 2. Name of the invention Floating heat treatment furnace Meandering prevention device for metal strip material 3, relationship with the case of the person making the amendment Patent applicant address: 66 Kade, Hoshizaki-cho, Minami-ku, Nagoya Name (371) Daido Steel Co., Ltd. (Nationality)
Representative Aki 1) Masaya 4, Representative
〒453 7.Delete the words ``Meandering detection function (sensor function)'' from line 18 to line 19 of page 1 of the detailed statement of correction. June 25, 1985 t, Indication of iB 1986 Patent No. 80,436 2, Title of invention Device for preventing meandering of metal strip material in floating heat treatment furnace 3, Relationship with the amended person case Patent Applicant Address: 66 Kade, Hoshizaki-cho, Minami-ku, Nagoya Name (371) Daido Steel Co., Ltd. Representative: Masaya Akita 4, Agent: 453-6, Subject of amendment: Brief description of the drawings in the specification Column 7,
Contents of the amendment On page 14, lines 9 and 10 of the specification cylinder, the statement ``Figures 7 and 8'' has been amended to ``Figures 6 to 8''.

Claims (1)

[Claims] (1) A pair of left and right injection nozzles that constantly inject gas while facing the conveyance path of the metal strip material are disposed facing each other at the same inclination angle with respect to the center line in the conveyance direction, and both injection nozzles are A device for preventing meandering of a metal strip-shaped material in a floating heat treatment furnace, in which the jet nozzle is provided along the longitudinal direction of the injection nozzle and is provided diagonally rearward at an appropriate inclination angle with respect to the metal strip-shaped material.