JPS5945447B2 - Round steel cooling floor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a round steel cooling bed for cooling round steel, such as steel pipes and round bars produced in a steel factory, while being transported on a conveyor.

In a round steel cooling bed that cools round steel while being transferred on a conveyor, the following are usually required.

(1) In order to minimize bending of the round steel during cooling, the round steel to be cooled is cooled uniformly.

(2) It is possible to reduce the difference in cooling time depending on the size of the round steel, shorten the cooling time, and shorten the length of the cooling bed.

(3) Buffer function for storing several round bars in the cooling bed (hereinafter, buffer function refers to a function for storing round bars).

), even if a problem occurs in the round steel exit processing line, the round steel entering the cooling bed can be processed, reducing the occurrence of defective materials.

(4) Power consumption can be reduced.

The present invention provides a cooling bed that can fully satisfy these requirements.

Next, the present invention will be explained with reference to an embodiment shown in the drawings.

In Figures 1 and 2, 1 is a slat conveyor, 2 is a conveyor with top rollers, and slat conveyor 1 and conveyor 2 with top rollers 3 are downwardly inclined conveyors that rotate in the same direction. 1 and 2 were arranged in parallel.

The rotational speed of the slat conveyor 1 was made larger than the rotational speed of the top roller-equipped conveyor 2.

The slat conveyor 1 is a normal chain conveyor made up of a large number of chains with a flat back surface, and the top roller conveyor 2 has a top roller 3 as shown in FIG. A lever 4 is rotatably attached to the lever 4 and is rotatably provided at regular intervals.

When the lever 4 with the top roller 3 is in an upright state as shown in FIG. 1, it can no longer be used in the direction of movement of the conveyor 2, but it can freely fall down in the opposite direction.

A horizontal slat conveyor 5 consisting of an ordinary chain conveyor is disposed following the lower end of the downward-sloping slat conveyor 1 and the top roller conveyor 2, and this horizontal slat conveyor 5 has a fixed type with a buffer function. A stopper 6 with a roller 9 and a stopper 6a with an elevating roller 9a are provided.

The rear ends of both conveyors 1 and 2 and the horizontal slat conveyor 5
The tips of the conveyors 1 and 2.5 are intertwined with each other so that the round steel 7 can be transferred smoothly. In FIG. 1, they are arranged at predetermined intervals in the direction perpendicular to the plane of the paper, so that the round steel 7, which is a long object, can be easily transported.

The lifting roller stopper 6a is composed of a lever 8 that rotates about its lower end and a roller 9a that is rotatably provided at the tip of the lever 8. In the state shown in FIG. There is no better example of this, but I made it so that it could fall freely in the opposite direction.

10 is a stopper.

11.12 is a roller conveyor that conveys the round steel 7 in the axial direction, and transfers the round steel 7 from the roller conveyor 11 to the conveyors 1 and 2, and from the conveyor 5 to the roller conveyor 12.
The round steel 7 is transferred by a conventionally known kick or the like (not shown).

As long as a fixed stopper 6 is provided as having a buffer function, it is not necessarily necessary to provide an elevating stopper 6a. If an elevating roller stopper 6a is installed inside, the buffer capacity can be increased.

In the zone where the downward-sloping slat conveyor 1 and the conveyor with top rollers 2 are located, the round steel is cooled from 900° C. or higher to about 300° C. by natural air cooling while being transported.

When transporting the round bar 7, the top roller conveyor 2 moves in the downward direction while suppressing the free movement of the round bar 7 due to the action of the top roller 3, and the slat conveyor 1 rotates in the same direction as the top roller conveyor 2. Rotation is forcibly given to the round steel 7.

As a result, the round steel 7 is cooled under a constant rotating state, so that the temperature difference on the circumferential surface of the round steel 7 is suppressed, and the round steel 7 with less bending is easily formed. Cooling is carried out as obtained.

By providing the downwardly inclined slat conveyor 1 and the conveyor with top rollers 2, the following effects can be obtained.

(1) Because the round steel is always pressed against the rotatable top roller 3 due to the component force of the round steel's own weight in the direction of inclination,
Uniform rotation of the round steel 7 is reliably obtained, and a round steel with a small temperature difference during cooling and a small degree of bending can be obtained.

(2) Regardless of the speed of the downward-sloping conveyor 2 with top rollers, by changing the speed of the downward-sloping slat conveyor 1 to increase the rotation of the round steel, the cooling time for particularly large round steel can be shortened. , the length of the cooling bed can be made as short as possible.

In addition, in order to reduce the temperature difference in the circumferential direction of round steel,
The faster the round steel rotates, the better.

(3) In the case of a downward slope type, unlike in the case of an upward slope type, by lowering the top roller 3 below the conveyor, it can easily be used as a buffer to store round steel in an emergency. can be used.

In addition, in the case of the up-sloping type, it is impossible to adopt the dart king type, and it is necessary to pay sufficient attention to safety in terms of operation control, etc. There are shortcomings that tend to affect quality.

(4) It is easy to control because it can be operated in continuous rotation.

In addition, in the case of an upward slope type, pitch operation must be adopted, which makes the control complicated.

(5) Due to the action of the component force of the weight of the round steel in the direction of inclination, the power of the conveyor with top rollers is less than that of a horizontal type or an upwardly inclined type conveyor with top rollers.

On the other hand, the zone where the horizontal slat conveyor 5 is located is provided with a buffer function to deal with troubles in the outgoing equipment of this zone.

For this reason, in the event of a problem in the processing line on the output side of the round steel 7 such as the roller conveyor 12, conventionally the operation of the cooling bed had to be stopped. There is no need to stop the operation of the inclined slat conveyor 1 and the top roller conveyor 2 until the amount of water accumulates, and the cooling operation of the round steel 7 can be continued.

Furthermore, in this zone, the temperature of the round steel itself has dropped to a certain extent, and it has sufficient strength and rigidity.

Therefore, even if the round steel rotates unevenly for a short time,
Since the rigidity of the round steel itself is hardly affected, a horizontal slat conveyor 5 is used here.

Next, we combined a downwardly inclined slat conveyor 1 and a top roller conveyor 2, which rotate in the same direction, and made the rotation speed of the slat conveyor 1 greater than the rotation speed of the top roller conveyor 2. Explain why some combinations are more effective than other combinations.

First, slat conveyor 1 and top roller conveyor 2
When is horizontal and the traveling speed S of the slat conveyor 1 is greater than the traveling speed T of the conveyor 2 with top rollers, the round bar 1 operates as shown in FIG.

That is, the round bar 7 moves from the state in which it is in contact with the rear top roller 3 as shown in FIG. 3a to the rear top roller 3 as shown in FIG.

In this case, the round steel 7 just rests on the slat conveyor 1 and does not rotate.

When the round bar 7 on the slat conveyor 1 moves further forward, the round bar 7 hits the front top roller 3a and rotates in the direction shown by the arrow in FIG. 3C.

As a result, due to this rotational action, the round bar 7 moves backward, and the third
As shown in Figure d, it moves away from the front top roller 3a.

However, due to the action of the slat conveyor 1, the round steel 7
It is again pressed against the front top roller 3a.

In this way, the round bar 7 hits and leaves the front top roller 3a.

Therefore, the round steel 7 cannot be rotated uniformly and is not cooled uniformly.

Further, there are disadvantages in that the round steel 7 cannot be bent or the round steel 7 may be bent, and noise is also generated.

Next, FIG. 4 shows the action of the round steel 1 in the case of the same horizontal type, when the traveling speed T of the conveyor 2 with top rollers is higher than the traveling speed S of the slat conveyor 1.

In this case, it is safe to assume that the traveling speed S acts in the opposite direction to the traveling speed T.

The round bar 7 is attached to the rear top roller 3 as shown in FIG. 4a.
Due to the action of , rotation is applied in the direction of the arrow, and due to the action of the rotational force, the roller moves away from the rear top roller 3 as shown in FIG.

However, the rotation of the round bar 7 immediately stops, and by the action of the slat conveyor 1, the round bar 7 is conveyed toward the rear top roller 3 as shown in FIG. 4C.

Then, as shown in FIG. 4d, the round bar 7 hits the rear top roller 3 again, is given rotation, and also tries to separate from the rear top roller 3.

Therefore, even in this case, uniform rotation cannot be obtained, and as a result, uniform cooling cannot be obtained.

Also, noise is generated.

In addition, in the case of horizontal type, the traveling speed S of both conveyors 1 and 2 is
, T are the same, the round bar 7 does not rotate, and therefore,
The round steel 7 has the disadvantage that the circumferential surface is not cooled uniformly and may bend.

In addition, the advancing speed S of the slat conveyor 1 is
is greater than or equal to the traveling speed T of the conveyor 2 with top rollers, the round bar 7 is rotated in the direction of the arrow, as shown in FIG. 5, due to the action of the slat conveyor 1. Although a force is applied, it may separate from the rear top roller and the frictional force may not be transmitted to the round steel 7, and the round steel 7 with a large bend may not rotate and may not be cooled uniformly. There is.

If the slat conveyor 1 is of the up-tilt type and the traveling speed S is smaller than the traveling direction T of the conveyor 2 with top rollers,
As shown in FIG. 6, the round bar 1 rotates in the direction shown by the arrow and is transported forward.

It rotates evenly and cools evenly.

Furthermore, even if the top roller-equipped conveyor 2 stops, the slat conveyor 1 is always in motion and rotates well.

However, as will be explained later, compared to the downward slope type,
There is a disadvantage in terms of the tension of the Cheno.

If the slat conveyor 1 is a downward slope type and the traveling speed S of the slat conveyor 1 is higher than the traveling speed T of the conveyor 2 with top rollers, the round bar 7 will move in the direction of the arrow due to the action of the slat conveyor 1, as shown in FIG. and rotate to the front top roller 3.
a, and the frictional force generated between the upper surface of the slat conveyor 1 and the round steel 7 and the reaction force from the front top roller 3a can form a couple, so that it rotates uniformly.

Therefore, the forced rotational force is sufficiently transmitted even to the round steel 7 which is largely bent, and the round steel 7 is uniformly cooled, so this combination brings about a good effect.

Note that the slat conveyor 1 is of a downward slope type, and the advancing speed S
is smaller than the traveling speed T of the conveyor 2 with top rollers, the round steel 7 rotates in the direction of the arrow as shown in FIG. There is a possibility that the rotational force of the slat conveyor 1 is not sufficiently transmitted to the slat conveyor 7, and uniform cooling may not be performed.

Next, the relationship between the eccentricity of the round steel and the coupled moment of external force will be discussed with reference to FIGS. 9 to 12.

In Figures 9 to 12, 1 is the slat conveyor, 7 is the round steel, W is the own weight of the round steel 7, R is the support reaction force, F is the external force acting on the round steel 7 by the conveyor 2 with top rollers, and h is the external force. The distance between F and the position where the frictional force F' acts, that is, the length of the arm, F' is the force generated by the friction between the round steel 7 and the round steel support surface, which is the top surface of the slat conveyor 1, and the external force F
r is the radius of the round steel 7, 0 is the rotation center of the round steel 7, 0' is the center of gravity of the round steel 7, and e is the center of gravity 0' relative to the rotation center 0 of the round steel 7. It is the amount of eccentricity.

In addition, the sliding friction coefficient of the round steel 7 is μ, the apparent friction coefficient between the round steel 7 and the round steel support surface is μ′, and the rolling friction coefficient is f.
The driving moment of the round steel 7 is Mp, and the eccentric moment of the rotation of the round steel 7 is Me.

Now, when the round steel 7 is stationary and the center of rotation 0 and the center of gravity 0' are on the same perpendicular line, it exhibits an external force balance state as shown in FIG.

The round steel 7 is balanced only by the support reaction force R.

In this state, if an external force F is applied to the position of height h, the round steel 7 tries to rotate.

The driving moment t-Mp at this time is Mp=hF The external force F and the force F' form a couple, and F' is the force generated by the friction between the round steel 7 and the round steel support surface, so F=F' =
μ′R Therefore, Mp=hμ′R Here, R=W Therefore, Mp=hμ′W In the state shown in FIG. If the steel 7 is rotating, it will be □・-, and if the round steel 7 is rotating while sliding, it will be 〈μ′
If the round steel 7 does not rotate but slides, then μ'-μ.

Therefore, μ' changes from μ to μ depending on the condition of the round steel T.

In other words, μ' can take μ as its maximum value.

Therefore, the maximum driving moment Mpmax is Mpm
ax = hμW.

On the other hand, the eccentric moment Me of the round steel 7 is Me=eW It is.

Since the rotation condition of the round steel 7 is Mpmax > Me, hμW>eW, therefore, e < hμ, and when the eccentricity e satisfies this condition, the round steel γ can rotate.

Next, a case where the slat conveyor 1 etc. are inclined by θ will be explained with reference to FIG. 11.

As shown in FIG. 11, when the rotation center 0 and the center of gravity 0' are on the same perpendicular line, when the round steel 7 is at rest, the weight W of the round steel 7 is
is the reaction force R of the round steel support and the center 0 of the top roller 3.
It is supported and balanced by a directional force R'.

Then, the force R′ in the direction of center 0 acting on the top roller 3
are the support base reaction force R'v of the top roller 3 and the tension force R/ of the chain in the inclination direction.

Balanced by

In this state, the top roller 3 is placed parallel to the inclined surface and at a height h.
At the position, if you apply an external force F1 and move it in the direction of the arrow,
The round steel 7 tries to rotate.

At this time, the maximum rotational driving force F1 that can be applied to the round steel 7 forms a couple with the frictional force between the support base and the round steel 7, based on the same principle as in the horizontal case described above.

Therefore, F = μR = μWCO3θ The maximum driving moment M p'max is: Mp/rrlax = hμWcosθ The driving moment Mp is: Mp = eW In order for the round bar 7 to rotate, Ml)'max > Mp hμWcosθ>eW Therefore, e < hμcosθ In normal cases, the inclination angle is considered to be sufficiently small, so
It can be thought of as COSθki1.

e<hμcosθkihμ This means that if it is a slope type, even if it is an up slope type,
It is almost the same even if it is a downward slope type.

Therefore, the allowable eccentricity e of the round steel 7 is almost the same for both the horizontal type and the inclined type.

However, in the case of an incline, the total tension of the conveyor 2 with top rollers differs between an upslope and a downslope.

As shown in Fig. 11, the torque chain tension Fup in the case of an uphill slope is F up = F 1 + R'H + Wc5inθ
+WcCO3θ・μ"Here, Wc is Cheno weight, R'
H=Wsinθ, μ'' is the coefficient of friction between the chain rail and the chain rail.

Therefore, Fup=μWcosθ+Wsinθ+Wc5inθ+W
c CO3θ°μ"As shown in Figure 12, the torque chain tension Fdown in the case of a downward slope is Fdown = F 1- R'H-Wc sinθ0Wc CO3θ・μ"=μWcosθ+WcCO3θ°
μ“−(Wsinθ×Wc 5iHθ) Therefore, F
down < Fup, and the difference is 2 (Wsinθ+Wc5inθ)
becomes.

In the case of a downward slope, if the arrangement is as shown in Figure 12,
It is functionally the same as the uphill case.

In the figure, arrows indicate the traveling directions of the slat conveyor 1 and the conveyor with top rollers 2, respectively.

At this time, as described above, the feed speed S of the slat conveyor 1 is set higher than the feed speed T of the conveyor 2 with top rollers.

At this time, the top roller 3 runs in the opposite direction to the slat conveyor 1.

Therefore, this type has the same functionality as the up-slope case shown in FIG. 6, and yet, as mentioned above, the energy can be lower than the up-slope type.

Therefore, it can be seen that it is best to use a downwardly inclined type in which the conveyors rotate in the same direction, and the rotation speed S of the slat conveyor 1 is higher than the rotation speed T of the conveyor 2 with top rollers.

In this way, in the present invention, since the structure as described in the claims is adopted, as described above, round steel such as pipes and round bars can be transferred while being rotated uniformly, so that uniform cooling can be achieved. It can be obtained reliably and easily, and there is extremely little bending of the round steel.

It also has a buffer function, which is extremely useful.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the present invention, FIG. 2 is a plan view, and FIGS. 3 to 8 are operation diagrams showing differences in operating states between the present invention and other types of devices. Explanatory diagram, No. 9-1
FIG. 2 is an explanatory diagram showing how force acts in each type. 1...Slat conveyor, 2...Conveyor with top roller, 3, 3a...Top roller, 5...Horizontal slat conveyor, 6.6a
...Stopper, 7...Round steel, 11.1
2...Roller conveyor.

Claims (1)

[Claims] 1. A downwardly inclined slat conveyor and a conveyor with top rollers, which rotate in the same direction, are arranged in parallel, and the rotational speed of the slat conveyor is greater than the rotational speed of the conveyor with top rollers. Round steel cooling floor. 2 A downwardly inclined slat conveyor and a top roller conveyor that rotate in the same direction are arranged in parallel, and the rotating speed of the slat conveyor is made larger than the rotational speed of the top roller conveyor, and the downwardly inclined type conveyor rotates in the same direction. A round steel cooling bed in which a horizontal slat conveyor is arranged following the lower end of the slat conveyor, and a stopper with rollers for storing round steel is provided in the horizontal slat conveyor section.