JP4302507B2 - Steel material conveying device and method for setting diameter of conveying roller of steel material conveying device and interval between adjacent conveying rollers - Google Patents

Description

  The present invention relates to a steel material conveying device and a method for setting a diameter of a conveying roller of a steel material conveying device and an interval between adjacent conveying rollers, and more specifically to a technique for reducing steel material conveying noise. is there.

As a technique for reducing noise in conveying work of long steel materials or the like in a steel strip finishing equipment or the like, those shown in Patent Documents 1 to 3 are known.
These conventional techniques have attempted to reduce the noise generated by the conveying roller by devising the conveying roller such as a long steel material.
Japanese Utility Model Publication No. 6-61303 JP 2000-71007 A JP 2000-71008 A

However, even if the noise of the conveying roller itself is reduced, the noise of the conveying operation cannot be significantly reduced.
Therefore, as a result of earnest research, the inventor of the present application has come to know that it is important to reduce noise generated by the steel material other than the conveying roller.
Therefore, an object of the present invention is to reduce collision noise generated from the steel material itself.

In order to achieve the above object, the present invention has taken the following measures.
That is, the feature of the steel material conveying device of the present invention for reducing collision noise is that a plurality of conveying rollers are arranged in parallel at a predetermined interval and the steel material is intermittently supported only by the plurality of conveying rollers. In the steel material conveying apparatus, the diameter D of the conveying roller and the interval L between adjacent conveying rollers are set based on the following equation (1) so that the collision angle θ between the steel material tip and the conveying roller is 5 degrees or less. It is in the point.

The roller interval L refers to the distance between the centers of the rollers.
As shown in FIG. 1A, when a long steel material 2 is conveyed by a conveying roller 1 arranged at a predetermined interval L, the steel material 2 is intermittently supported by the conveying roller 1, so that the steel material is caused by gravity. 2 is bent, and the tip and rear ends of the steel material 2 are supported in a cantilevered manner. As a result, the front end of the steel material 2 hangs down below the horizontal line connecting the apexes of the transport rollers 1.
That is, as shown in FIG. 1 (b), the tip of the steel material 2 and the conveying roller 1 are not in contact with the roller apex, but contact with each other at a point P below the apex. The steel material 2 is transported in the horizontal direction at a speed equal to the peripheral speed Vr of the transport roller 1, but the tangent of the roller 1 at the point P is rotated from the horizontal by θ (hereinafter, this angle θ is referred to as “collision angle”). The collision angle is defined as “an angle formed by a perpendicular line passing through the center of the conveyance roller and a straight line connecting the steel material tip collision point on the outer circumferential surface of the conveyance roller and the center of the conveyance roller”). The direction velocity component Vx is Vx = Vr · cos θ. As a result, a horizontal velocity difference of dVx = Vr−Vx occurs between the horizontal velocity Vr of the steel material tip and the horizontal velocity component Vx, and this relative velocity is It acts in a direction that hinders the advance of the steel material tip, and is converted into a longitudinal vibration of the steel material 2 and a lateral vibration of the conveying roller.

Further, the steel material tip is flipped upward in the vertical direction at a speed Vy (= Vr · sin θ), and the vertical component Vy is converted into a lateral vibration of the steel material 2 and the roller 1.
Due to these various vibrations, the conveying roller 1 and the steel material 2 generate a collision noise.
As a result of the experiment, the inventor of the present application has found that the effect of reducing the collision noise is great if the collision angle θ is set to 5 degrees or less, and has created the formula (1).
Therefore, if the steel material conveyance device of the present invention is used, noise emitted from the steel material itself can be reduced.

In addition, derivation | leading-out of Formula (1) is as follows.
That is, in the coordinate system shown in FIG. 2, the trajectory of the tip of the steel material is expressed as the following equation (a).

Here, if the collision angle when the steel material tip and the roller are in contact with each other is θ ₀ , the coordinates (x ₀ , y ₀ ) of the contact point are expressed by the following equations (b) and (c).

  Since the expressions (b) and (c) satisfy the expression (a) at the contact point, the following expression is obtained by substituting the expressions (b) and (c) into the expression (a).

Here, in the range of 0 ≦ θ ₀ ≦ 90 °, L increases in proportion to θ _0. Therefore, in order to make the collision angle θ smaller than θ ₀ , L ≦ L ₀ may be set. The range that the roller interval L can take is expressed by the above formula (1).
In the present invention, it is preferable that at least two or more of the plurality of transport rollers are driven by a single prime mover.
By setting it as such a structure, the range of the setting value of the space | interval of the adjoining conveyance roller becomes wide, and it can adapt to various steel materials.

It is preferable that the conveying rollers adjacent to each other driven by the one prime mover are transmitted with power by a timing belt.
By using a timing belt, noise can be greatly reduced compared to gears and chains.
In addition, a feature of the setting method of the diameter D of the conveying roller and the distance L between the adjacent conveying rollers of the steel material conveying device of the present invention is that a plurality of conveying rollers are arranged in parallel at a predetermined interval and the plurality of conveying rollers In the method of setting the diameter D of the conveying roller of the steel material conveying apparatus configured to intermittently support the steel material alone and the interval L between the conveying rollers adjacent to each other, the collision angle θ between the steel material tip and the conveying roller is 5 In order to make it less than or equal to the degree, the diameter D of the conveying roller and the interval L between the adjacent conveying rollers are set based on the following equation (1).

  According to the present invention, it is possible to reduce a collision sound generated by a steel material.

Embodiments of the present invention will be described below with reference to the drawings.
What is shown in FIG. 3 is a steel material conveying apparatus used in the refining equipment for strip steel.
This steel material conveying apparatus conveys the long steel material 2 in the longitudinal direction, and is generally called a roller table. The cross-sectional shape of the steel material 2 is round or rectangular, but may be an irregular cross-section.
The roller table has a plurality of transport rollers 1. These transport rollers 1 have a cylindrical shape or a columnar shape, and their axial centers are horizontal, and are arranged in parallel with each other and rotatable in the same plane. One motor 3 is provided for one transport roller 1, and each transport roller 1 is rotationally driven by the motor 3. Adjacent prime movers 3 are controlled so that they have the same rotational speed.

The transport roller 1 and the prime mover 3 are supported by a table frame 4. The two table rollers 4 are supported by the single table frame 4, and a plurality of table frames 4 are arranged in series.
In the roller table, a plate-shaped apron 5 is installed between the transport rollers 1 so that the front and rear ends of the steel material 2 do not fall. The upper surface of the apron 5 is set at a position lower than the apex of the conveying roller 1 so as not to contact the lower surface of the suspended steel material 2.

  When the diameter of the conveying roller 1 is D and the interval between the adjacent conveying rollers 1 is L, the collision angle θ (see “FIG. 1”) between the tip of the steel material 2 and the conveying roller 1 is 5 degrees. Based on the following formula (1), the diameter D of the transport roller 1 and the interval L between the adjacent transport rollers 1 were set.

In this embodiment, the “L” and “D” are determined for the case of transporting a 10 mm thick flat steel as the steel material 2.
The results are shown in Table 1.

In Table 1, “Table (1)” is a conventional roller table, “Table (2)” is a steel material conveying apparatus according to an embodiment of the present invention, “Table (2 ′)” and “Table” “(2 ″)” indicates a comparative example. According to Table 1, the “table (2)” of the embodiment of the present invention is caused by noise caused when the tip of the steel material 2 and the conveying roller 1 collide with the conventional roller “table (1)”. Some relative velocities are reduced by about 96% in the horizontal direction and about 80% in the vertical direction. As a result, the collision energy due to the relative speed difference at the time of collision contact is reduced by about 96%.
That is, when the roller and the steel material collide, the collision energy transmitted to the steel material is considered to be proportional to the square of the speed difference. Therefore, in FIG. 1B, the collision angle θ is changed and the relative speed (dVx ₀ , If it changes from (dVy ₀ ) to (dVx ₁ , dVy ₁ ), the change rate α of the amount of collision energy transmitted to the steel at the time of collision is defined by the following equation (d). This α is the “collision energy reduction rate” in “Table 1”.

FIG. 4 shows another embodiment of the present invention, and at least two of the transport rollers 1 are driven by one prime mover 3. Specifically, five transport rollers 1 are provided in one table frame 4, and one of the motors 3 is connected to one central transport roller 1 of these transport rollers 1 through a shaft coupling 6. Has been.
Each conveyance roller 1 is provided with a pulley 7, and a timing belt 8 is stretched around the pulley 7 of the adjacent conveyance roller 1, and each conveyance roller 1 is driven by the prime mover 3 at a constant speed.

By driving the plurality of transport rollers 1 with a single prime mover 3 in this way, the roller interval L can be designed to be shorter, and materials that are more likely to sag can be transported. Further, by using the timing belt 8 as the torque transmission means, noise can be reduced as compared with a gear or chain.
When the steel material conveying device shown in FIG. 4 conveys a flat steel having a thickness of 3 mm that is not bent except for deflection due to its own weight, the above formula (see FIG. 1) is set so that the collision angle θ (see “FIG. 1”) is 5 degrees. Based on 1), the diameter D of the conveying roller and the interval L between the adjacent conveying rollers were set.

  The results are shown in Table (3) in Table 2 below.

The table (2) in Table 2 is the table (2) in Table 1, and when a flat bar having a thickness of 3 mm (thickness 10 mm in Table 1) is conveyed, the collision angle θ is 15.2 °. Indicates what to say. Tables (3 ′) and (3 ″) show comparative examples.
According to this "Table 2", the "table (3)" which is an embodiment of the present invention is compared with the "table (2)", the relative speed that is the cause of noise when the steel material tip and the roller collide. Is reduced by 89% in the horizontal direction and 67% in the vertical direction. As a result, the collision energy due to the relative speed difference at the time of collision contact is reduced by 89%.

As described in detail above, it can be seen that as a method for reducing the steel material conveyance noise, the steel material may be conveyed so that the collision angle θ between the tip of the steel material and the conveyance roller is 5 degrees or less.
In addition, this invention is not limited to what is shown to the said embodiment.

  INDUSTRIAL APPLICABILITY The present invention can be used for transporting steel materials in strip finishing equipment.

FIG. 1 is an explanatory diagram of the present invention, in which FIG. 1 (a) is an explanatory diagram of a configuration, and FIG. 1 (b) is an enlarged view of a steel material front end portion in FIG. FIG. 2 is an explanatory diagram showing a coordinate system for deriving the equation (1). FIG. 3 is an explanatory view of a steel material conveying device showing an embodiment of the present invention, in which FIG. 3 (a) is a plan view, FIG. 3 (b) is a cross-sectional view along line AA in FIG. (C) is the BB sectional drawing of a (b) figure. FIG. 4 is an explanatory view of a steel material conveying device showing another embodiment of the present invention, in which FIG. 4 (a) is a plan view, FIG. 4 (b) is a cross-sectional view taken along line AA in FIG. FIG. 4C is a sectional view taken along line BB in FIG.

1 Conveying roller 2 Steel material 3 Motor

Claims (4)

In the steel material conveying device configured to support the steel material intermittently only by the plurality of conveying rollers while arranging the plurality of conveying rollers in parallel at a predetermined interval.
The diameter D of the conveying roller and the interval L between adjacent conveying rollers are set based on the following formula (1) so that the collision angle θ between the tip of the steel material and the conveying roller is 5 degrees or less. Steel material transfer device.

  The steel material conveying apparatus according to claim 1, wherein at least two of the conveying rollers are driven by one prime mover.   3. The steel material conveying device according to claim 2, wherein the adjacent conveying rollers driven by the one prime mover are transmitted with power by a timing belt. Setting of the diameter D of the conveyance roller of the steel material conveying apparatus and the interval L of the adjacent conveyance rollers which are configured such that the plurality of conveyance rollers are arranged in parallel at predetermined intervals and the steel material is intermittently supported only by the plurality of conveyance rollers. In the method
A steel material characterized in that a diameter D of the conveying roller and an interval L between adjacent conveying rollers are set based on the following equation (1) so that the collision angle θ between the tip of the steel material and the conveying roller is 5 degrees or less. A method for setting the diameter D of the conveyance roller of the conveyance device and the interval L between adjacent conveyance rollers.

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