JP6028706B2 - Round steel slab or steel pipe storage device - Google Patents

Description

  The present invention relates to a storage device for round steel slabs or steel pipes. In particular, in the seamless steel pipe manufacturing process, the slabs are carried into a device for temporarily storing a large number of round steel slabs as raw materials in advance. The present invention relates to technology for preventing trouble and noise.

  A seamless steel pipe is generally manufactured by using a round steel slab (called a round billet) which is long and solid and has a circular cross section, and is subjected to piercing and rolling. And the manufacturing process arrange | positions furnaces, such as a heating furnace, a piercer, an elongator, and various rolling mills in series according to a use purpose, and comes to process the round steel slab supplied continuously. Yes. Therefore, in order to produce a seamless steel pipe efficiently, it is necessary to prepare a large number of round steel slabs in advance so that the treatment can be performed continuously before starting the treatment. .

  Usually, a round steel slab sent from a foundry is called a long billet, which is actually the length necessary to manufacture one seamless steel pipe (called a cut billet, 1.1 to A length of about 3.6 m) (for example, the outer diameter is 140 to 270 mm and the length is 4.5 to 12.5 m). For this reason, conventionally, the long billet is cut into a predetermined length and then loaded into a storage means called a cradle, where it is temporarily stored until a certain number is accumulated. The stored round billets are then sequentially cut out from the storage means and carried out to the manufacturing process of the seamless steel pipe.

  By the way, the round billet cut into a predetermined length needs to be continuously carried into the storage means. Previously, a storage device in which a device called a kicker for kicking out a round billet in the radial direction in the vicinity of the opening above the storage means has been put into practical use. However, in this device, the round billet jumps in a lateral direction with respect to its axis and then falls into the storage means, so that significant noise is generated and impact is applied to other machines and devices. Another problem was that they deteriorated. Therefore, as shown in FIG. 1, a kicker 3 for kicking the round billet 1 that has moved on the conveying roller 2 in the lateral direction, a storage means 5 for stockpiling the kicked round billet 1 in sequence, and the storage A storage device including a cylinder-driven arm 4 on which the kicked round billet 1 is placed on the upper end of the kicker 3 side of the means 5, one end of which is swingably locked and the other end is movable up and down is conceivable. The efficient operation method is also disclosed in Patent Document 1. According to this, since the kicked round billet 1 does not fall directly on the storage means 5 and falls on the storage means 5 while being on the arm 4, the noise generation frequency and impact are Compared to the drop method, it is considerably reduced.

JP 2001-975576 A

  However, even in the storage device, since the receiving surface of the cradle was a smooth curved surface, even if the arm was lowered, the round billet that was placed remained on the arm as it was, and the subsequent round billet Stagnation and poor conveyance (see Fig. 2 (a)), or problems such as falling to the tip of the preceding round billet on the arm and causing noise (see Fig. 2 (b)). There was a case.

The present invention has been made for the purpose of solving the above-described problems, providing a storage device that can stably store and reduce noise, and the gist thereof is as follows.
(1) A kicker that kicks out the round steel slab that has moved on the transport roller in the lateral direction, a storage means that sequentially stores the kicked round steel slab, and an upper end on the kicker side of the storage means, In a storage device equipped with a kicked round steel slab, one end of which is rockably locked, and the other end of which is movable up and down, and a cylinder drive arm.
The receiving surface of the storage means that becomes the contact surface of the kicked round steel slab is a stepped shape in which the height or depth L of each step satisfies the following formula with the corresponding surface as the ascending side. Storage device characterized by.
Record
a ≦ b × (N−1) × sin θ
D ≦ H ≦ 1.5 × D
Where D: the outer diameter of the round steel slab,
N: Number of round steel slabs arranged on the arm
α = sin ⁻¹ (1-2 L / D), θ: inclination angle of the arm,
a = D / 2−L, b = (D / 2) × cos (θ + α)

(2) instead of the prior determined steel slabs, storage device according to the steel pipe (1).

  According to the present invention, there is no conveyance failure that occurs when stocking round billets in the storage means, noise can be reduced, and stable operation becomes possible.

Schematic diagram showing a conventional storage device A diagram schematically showing an example of a problem that occurs in a conventional storage device Schematic diagram showing a storage device according to the present invention Schematic diagram showing the stockpiling process of round steel slab when the present invention is applied The schematic diagram which shows the rotational moment which made the corner of the step which acts on the round billet caught on the step which concerns on this invention a fulcrum

Embodiments of the present invention will be described below with reference to the drawings.
First, a conventional storage device is shown in FIG.
In general, a group of transport rollers 2 for transporting a round billet 1 cut to a predetermined length is disposed on the side of the storage means 5. The round billet 1 that has been continuously conveyed on the group of conveying rollers is stopped traveling beside the storage means 5 and kicked out sequentially by the kicker 3 in the lateral direction. The kicked round billet 1 is placed on an arm 4 whose one end is locked to the kicker 3 so as to be movable up and down, and the arm 4 is inclined (sloped several degrees from the horizontal so that the round billet rotates). To the other end side. Therefore, a row of round billets 1 is formed on the arm 4. When the round billet 1 on the arm 4 reaches a predetermined amount, the operation of the cylinder 6 for changing the inclination (posture) of the arm 4 is performed, and the tip of the arm 4 is lowered so that the subsequent round billet 1 is It falls on the row of billets 1 and sequentially accumulates in the storage means 5. A plurality of kickers 3 and arms 4 are provided for the conveyance line of the round billet 1. Therefore, the storage means 5 is formed of a columnar member with a gap on its side surface (surface perpendicular to the paper surface in FIG. 1) so as not to interfere with the kicker 3, the arm 4, the cylinder 6 and the like. Yes.

  However, in the conventional apparatus as described above, the round billet 1 that has been placed even if the arm 4 is lowered does not collapse and remains on the arm 4 in a row, as shown in FIG. In some cases, the round billet stagnated, resulting in poor conveyance. Further, as shown in FIG. 2 (b), there is a problem that noise is generated when the subsequent round billet falls to the tip of the preceding round billet on the arm 4 with the arm 4 lowered to the lowest point. It was.

Therefore, the present inventors pay attention to the shape of the contact surface of the storage means (cradle) that becomes the receiving surface of the kicked round billet, and according to the lowering of the arm by making the contact surface stepped, We have found that the preceding round billet is sequentially stacked on the subsequent round billet on the arm.
That is, as shown in FIGS. 4A to 4D, when the tip of the arm 4 is lowered while the round billets 1 are arranged in a line on the arm 4, the first one at the forefront of the arm 4. A round billet catches on the first tier and rides on the second round billet. When the tip of the arm 4 is further lowered, the second round billet is hooked on the second stage and rides on the third round billet. Similarly, when the n-th round billet rides on the (n + 1) -th round billet and the tip of the arm 4 reaches the lowest point, the round billet in the cradle is collapsed and stacked.

  Next, the relationship between the shape of the step provided on the contact surface of the cradle and the diameter of the accumulated round billet necessary for realizing the above-described operation will be described with reference to FIG.

The height of the step is H, the depth is L, the outer diameter of the round billet is D, the weight is W, the inclination angle of the arm 4 (the angle that the arm 4 makes with the horizontal direction) is θ, and the arm 4 is aligned on the arm 4. Assuming that the number of the round billets is N, as shown in FIG. 5, when the round billet 11 at the end of the arm is caught on the corner of the step, the rotation is performed with the step angle A acting on the round billet 11 as a fulcrum. The moment balance is expressed by the following equation.
a × W = b × (N−1) × W × sin θ
That is,
a = b × (N−1) × sin θ
Here, a is the distance between the step A and the line of gravity (W) acting on the round billet 11, and b is the step A and the subsequent round billet group is the round billet 11. Is the distance from the line of action of the force ((N−1) × W × sin θ) that pushes along the inclination angle of the arm.
a = D / 2−L, b = (D / 2) × cos (θ + α),
α = sin ⁻¹ (2 × a / D) = sin ⁻¹ (1-2L / D),

Therefore, when the tip of the arm is further lowered (when the inclination angle of the arm is increased), the subsequent round billet 12 sinks under the round billet 11 at the tip of the arm caught on the step, and the round billet 11 Is superimposed on the subsequent round billet 12 when the counterclockwise rotational moment acting on the round billet 11 in FIG. 5 is greater than or equal to the clockwise rotational moment.
a ≦ b × (N−1) × sin θ <1>
Is true.

Further, in order for the round billet 11 that is overlaid to roll to the right and overlap the top round billet 12 and the second round billet 13 that are aligned on the arm, The height H of the step is
H ≧ D <2>
It is desirable to satisfy

  Therefore, it is preferable that the height H and the depth L of the step satisfy the above formulas <1> and <2>. Further, in order to secure the number of storages and prevent noise and impact due to falling, the step height H is preferably as small as possible within the range satisfying the above formula <2>, and H ≦ 1.5 × D. It is preferable.

The above-described storage device (step height H = 259 mm, step depth L = 68 mm) was employed to carry out stockpiling work for the round billet, and the effect was confirmed. The target round billet is a high alloy steel with an outer diameter of 190 mm. Further, when the round billet is applied to the first stage of the storage device, the inclination angle of the arm is 23 degrees, and the number of round billets arranged on the arm is five.
As a result, according to the present invention, there was no conveyance failure that the round billet stagnated, and there was no noise abnormality.

  As mentioned above, although the round billet was described as the stockpiling target material, the stockpiling target material according to the present invention is not limited to the round billet, and can be applied as a storage device for a long material having a circular cross section such as a steel pipe. I can do it.

1 round billet 2 transport roller 3 kicker 4 arm 5 storage means (cradle)
6 Cylinder H Stage height L Stage depth D Round billet outer diameter W Round billet weight A Stage angle θ Arm inclination angle (angle between horizontal direction)

Claims (2)

A kicker that kicks out the round steel slab that has moved on the transport roller in the lateral direction, storage means that sequentially stores the kicked round steel slab, and kicked out to the upper end on the kicker side of the storage means In a storage device equipped with a round steel cast piece, one end of which is rockably locked, and the other end of which is movable up and down, and a cylinder drive arm.
The receiving surface of the storage means that becomes the contact surface of the kicked round steel slab is a stepped shape in which the height or depth L of each step satisfies the following formula with the corresponding surface as the ascending side. Storage device characterized by.
Record
a ≦ b × (N−1) × sin θ
D ≦ H ≦ 1.5 × D
Where D: the outer diameter of the round steel slab,
N: Number of round steel slabs arranged on the arm
α = sin ⁻¹ (1-2 L / D), θ: inclination angle of the arm,
a = D / 2−L, b = (D / 2) × cos (θ + α) Instead of the round steel slabs, storage device according to claim 1, the steel pipe.

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