JP3349829B2 - Heating furnace scale crush separation equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for crushing and separating scales deposited on a hearth of a heating furnace for heating a slab.

[0002]

2. Description of the Related Art In a heating furnace in which a slab is continuously charged and heated, oxides adhered to the slab surface are peeled off as the slab is conveyed, and the oxides are gradually deposited on the heating furnace hearth to form a scale layer. . This scale layer deteriorates the combustion state in the furnace, causes the slab to become unbalanced, and has dimensional accuracy after rolling,
It comes to have a shape defect. For this reason, it was necessary to periodically shut down the furnace and perform the scale removing operation.

Conventionally, after removing the scale from the furnace to about 50 ° C., several tens of workers, including replacement workers, enter the furnace and pick up the scale using a pickaxe or rock drill. The excavation of the layer was performed manually and the excavated scale was also discharged to the outside of the furnace.However, the excavation of the scale layer releases latent heat inside the scale, preventing the furnace temperature from rising again. Therefore, the work in the furnace is limited to 10 minutes or more each time, and it requires constant replacement, so the furnace shutdown time becomes longer, more labor must be secured, and the work efficiency is poor. Was.

[0004] It is conceivable to perform a crushing operation by, for example, sending a device equipped with a rock drill into a furnace to perform the crushing operation by mechanical force instead of manpower for the scale crushing operation. Due to the force, the apparatus tends to roll over, and cannot be too large to be transported into a furnace with many skids, such as a walking beam furnace.

Japanese Patent Application Laid-Open No. 47-34111 proposes a device in which a scale scraping device is provided on the exit side of a heating furnace, and a scraping rod is advanced and retracted in and out of the furnace so that the scraping is performed at the time of retreat. .

[0006]

The scale deposited on the hearth of the heating furnace is used for heating slabs of different steel types having different heating temperatures.
It usually forms a layer due to a change in the furnace temperature such as a temperature drop during the suspension period. In a device of the type described above in which the scale is scraped by the scraping rod, scale removal is limited to the range in which the scraping rod reciprocates. It cannot be installed in a heating furnace that is difficult.

[0007] The present inventors have tried various methods for efficiently removing the scale in the entire furnace regardless of the shape of the heating furnace, and using a rotary cultivator as one of the methods. Considering the removal of scale deposited on the hearth of the heating furnace, we actually brought the cultivator into the heating furnace and tried it, but if the cultivator was used as it was, the cultivation blade would The scale did not float and bite into the scale layer, and the scale could not be removed. Grabbing the handle of the cultivator and pushing up so that the cultivation blade is pressed against the scale could scrape the scale.However, this requires considerable skill and effort, and it is configured so that it can be remotely controlled from the outside. This is not easy, and there is a disadvantage that it takes a long time to remove the scale up to the hearth because the scale is scraped off.

According to the trials of the present inventors, it has also been found that the scale layer is layered as described above, so that if the scale layer is scooped from below, the scale layer is easily peeled off.
Therefore, a first object of the present invention is to provide an apparatus capable of efficiently crushing and peeling in a short time by scooping a scale layer deposited on a heating furnace hearth. The purpose is to prevent the heating furnace hearth from being damaged at the time of crushing and peeling.

A third object of the present invention is to provide an apparatus capable of finely crushing a scale to a particle size which can be easily discharged.

[0010]

A crushing / separating apparatus for achieving the first object is configured to rotate a crushing claw about an x-axis, a y-axis, a z-axis or an axis inclined at an appropriate angle with respect to these axes. Then, it is made to bite into the scale layer, and is moved in the traveling direction while being scooped.

A moving vehicle capable of self-running on a scale layer deposited on a hearth of a heating furnace, and an x-axis, a y-axis, a z-axis or an appropriate angle with respect to these axes depending on a driving source installed on the moving vehicle. And a crushing claw that is driven to rotate about an axis that is inclined with the crushing claw.

According to the present apparatus, the crushing nail bites into the scale layer and then scoops up. However, since the scale layer has a layered shape, the scale layer is peeled cleanly and crushed.

Another device is a movable vehicle which can be moved or self-propelled on a scale layer deposited on a heating furnace hearth by remote control or by a towing device, and is mounted on the movable vehicle and driven The rotating body driven by the device, an elevating mechanism for lifting and lowering the rotating body, and a hammer attached to the rotating body and rotating together with the rotating body are provided.

When the rotating body lowered by the elevating mechanism is rotated by the driving device on the scale layer, the hammer rotating together with the rotating body is driven into the scale layer by its centrifugal inertial force.
After the hammering, the hammer cuts horizontally into the scale layer to which the layer is fixed and promotes the peeling of the scale, and as it turns upward, the hammer peels to cause the scale. Thus, as the scale moves,
It is stripped off one after another.

By installing a plurality of hammers around the circumference of the rotating body at regular intervals, the rotation of the rotating body becomes smooth, the speed of crushing and peeling of the scale is increased, and the working efficiency is improved. Another device is characterized in that the hammer is rotatably attached to the outer periphery of a rotating body with a pin.

In this device, much of the interlocking energy of the hammer is consumed for crushing and rises while being decelerated by the rotation of the rotating body. The self-weight of the hammer is applied from the point where the line of action from the center of gravity passes through the center of rotation of the rotating body, and the hammer rotates downward by increasing the angular acceleration about the pin as a fulcrum. Therefore, the hammer increases the crushing force on the scale by adding the centrifugal inertial force due to the rotation of the rotating body and the increase in angular acceleration due to the weight of the hammer,
Hammer due to excessive impact force during crushing,
Damage to the rotating body can be prevented.

In still another device, the hammer is T-shaped. In this device, the crushing action can be performed even when the rotating body is rotated in either direction, and the weight of the hammer head is increased, so that the impact force can be increased. Still another device is characterized in that a sensor for detecting contact of the rotating body with the scale is provided.

In the present apparatus, it is possible to know that the crushing and separating operation is being performed by the hammer by performing the detection by the sensor. The detection by the sensor can be detected, for example, by the fact that the rotating body is lowered by the elevating mechanism, and the scale is prevented from falling further by hitting the scale. As a result, the load for lowering the rotating body is increased.

A crushing and peeling device for achieving the second object is provided with a sensor for detecting when the crushing claw hits the heating furnace hearth, and when a detection signal is transmitted from the sensor,
The rotation driving of the crushing claw is stopped. So Moto
As a sensor used in the device, a torque meter that detects the torque of a motor that rotationally drives the crushing claw is exemplified.
When the crushing claws hit the hearth of the heating furnace, a larger torque is generated to drive the crushing claws than to crush and separate the scale layer, and when the torque rises to the set value, the output from the torque meter causes the motor to output. Will be stopped.

[0020]

[0021] An apparatus for achieving the third object includes a moving vehicle capable of self-layering on a scale layer deposited on a hearth of a heating furnace;
X along the traveling direction by a driving source installed in the mobile vehicle
Axis, y-axis, z-axis or a crushing claw that is driven to rotate about an axis inclined at an appropriate angle with respect to these axes, and the crushing claw has a blade-shaped second on at least one side. It is characterized in that the crushing claws are protruded so as to be warped sideways. Book
The crushing claw used in the device, when changing the direction of travel, the orientation
Must be reversed, but if it is formed symmetrically,
Even if the direction changes, that is, in either forward or reverse direction
Even if it rotates, it can be crushed.

[0022]

FIG. 1 shows a scale crushing and peeling machine according to the present invention. The scale crushing and peeling machine is provided with a caterpillar 1 and is remotely controlled from outside the furnace while watching a photographed image from an ITV camera mounted on the crushing and peeling machine. It comprises a moving vehicle 3 running on the scale layer 2 deposited in the furnace, and a crushing and separating mechanism 4 supported by the moving vehicle 3. An arm 6 pivotally mounted on the frame 5 so as to be able to pivot up and down; a hydraulic cylinder 7 serving as an elevating mechanism for connecting the frame 5 and the arm 6 to elevate the arm 6; A rotating body 11 that is rotationally driven by a motor 8 fixed to a rear end portion through a belt transmission 9, and a T-shaped hammer that is rotatably attached to a peripheral edge of the rotating body 11 at fixed circumferential intervals by pins 12. 1 And a sensor (not shown) for detecting the oil supply pressure of the hydraulic cylinder 7. The oil pressure detected by the sensor is displayed on a gauge installed in a control box (not shown) outside the furnace. is there.

In the scale removing operation, a carry-in door (not shown) is opened to enter the furnace, and the rotating body 11 is rotated on the scale layer 2 with the rotating body 11 at the top (or the moving vehicle 3 may be at the top). Run while driving. The hammer 13 pivotally attached to the rotating body by the pin 12 adds the increase in angular acceleration due to the weight of the hammer with the pin 12 as a fulcrum to the centrifugal inertial force due to the rotation of the rotating body, and the scale layer 2
Is driven into. After the driving, the scale is peeled horizontally to promote the peeling of the scale, and the scale is peeled by turning upward (see FIG. 2). When the rotating body 11 stops when the hammer hits the hard scale layer, the moving vehicle 3 is temporarily retracted to perform the crushing operation.

After the moving vehicle is moved in one direction to perform the above-described crushing operation, the moving vehicle is turned to the left or right side to perform the crushing operation again. Crushing and peeling are performed.
3 and 4 show another crushing and peeling machine,
The crushing and separating mechanism 2 comprises a moving vehicle 23 having a caterpillar 21 and running on a scale layer using a motor 22 as a driving source, and a crushing and separating mechanism 24 supported by the moving vehicle 23.
Reference numeral 4 denotes a support 26 rotatably supported by a support 25 standing upright from the moving vehicle 23, and connects the moving vehicle 23 and the support 26 to tilt the support 26 up and down. Cylinder 27 that switches between a use position where it is pressed against the scale layer and a non-use position where it is released above the scale layer.
And an arm 2 protruding downward from both sides of the support 26.
8, a crushing drum 29 pivotally supported between the arms, and a motor 32 attached to the support base 26 and driving the crushing drum 29 via a chain transmission mechanism 31. As shown in detail in FIG. 5, hook-shaped crushing claws 33 are formed so as to protrude at regular intervals in the circumferential direction, and a pair of tongue-shaped crushing claws 34 that warp in opposite directions to each other between the crushing claws. The mounted crushing pawl 35 is connected to the drive shaft 36.
Has a structure that can be inserted and removed at regular intervals.

FIG. 6 shows another example of the crushing ratchet.
An inverted trapezoidal crushing claw 38 is formed so as to protrude at regular intervals in the circumferential direction to form an uneven gear shape, and has a structure in which a tongue-shaped crushing claw 39 similar to the crushing claw 34 is attached between the crushing claw. Are fixed to the drive shaft of the crushing drum at regular intervals. A torque meter 46 for detecting the torque of the motor is connected to the motor 32. The torque detected by the torque meter 46 is:
When the torque is sent to the control device stored in the control box 47 installed on the mobile vehicle 23 and the torque reaches a set value,
The motor 32 is stopped. In addition, the control device controls, in addition to the motor 32, the motor 22 for controlling the traveling and stopping of the moving vehicle 23 and the cylinder 27 for switching the crushing drum 29 to a use position or a non-use position by remote control from outside the furnace. I have to do it.

Although not shown in FIG.
A hose connected to the vacuum device is attached, the tip of the hose is movable vertically and horizontally on the scale layer, and the suction port is directed right above the scale layer, preferably obliquely. This embodiment is configured as described above,
At the time of removing the scale, after the moving vehicle 23 is introduced into the furnace, the crushing drum 29 is switched to the use position by the operation of the cylinder 27 and pressed against the scale.
The moving vehicle 2 with the crushing wheel claw rotated by the drive of
3 is moved on the scale layer. With the rotation of the crushing claw wheel, the crushing claws 33 and 34 bite into the scale layer, and the scale layer is crushed and separated by scooping up the scale layer,
The crushed scale pieces are sucked out from the suction port of the vacuum.

When the crushing claws hit the hearth and the torque required for driving the crushing drum 29 increases and reaches a set value, the motor 32 is stopped and the driving of the crushing drum 29 is stopped. As described above, after the moving wheel 23 moves in one direction and the scale layer is scooped up by the crushing drum, the crushing claw illustrated in FIG. Is inserted into the drive source 36 and fixed. Then, the moving vehicle 23 is moved in the opposite direction to repeat the scooping and raising of the scale layer. In the crushing claw wheel shown in FIG. 6, the scale layer can be scooped up even if rotated in the forward or reverse direction, and there is no need to change the direction.

The crushing drum 41 shown in FIG. 7 is driven to rotate around an x-axis orthogonal to the traveling direction of the crushing drum 29 in the above embodiment. In another example driven by rotation, a crushing claw 42 is formed at a peripheral edge at a constant interval in a circumferential direction, and a blade 43 is provided on a circumference near the crushing claw so as to protrude laterally at a constant interval. I have.

At the time of crushing and peeling of the scale layer, the rotation axis of the crushing drum 41 is at an angle θ with respect to the scale layer, for example, 0 °.
It is tilted by 45 ° and moved in the traveling direction of the arrow while being rotationally driven in one direction. When the crushing drum 41 rotates around the tilt axis, the crushing claws 42 bite into the scale layer, scoop up, and separate and crush the scale layer.

FIG. 8 shows still another example of the crushing drum 44 in which the crushing claws 45 are formed in a spiral shape. The crushing claw 45 is driven to rotate about an axis inclined at, for example, 0 to 45 ° with respect to the vertical axis z axis. While moving in the traveling direction, crushing and peeling are performed. That is, the crushing nail is scooped up by being screwed into the scale layer.

[0031]

The present invention is configured as described above and has the following effects. According to the crushing and peeling device according to the first aspect, the scale layer can be efficiently crushed and peeled by scooping up the scale layer with the crushing claws.

According to the second aspect of the present invention , if the rotation of the crushing claw can be stopped by detecting when the crushing claw hits the hearth, damage to the hearth caused by the crushing claw can be prevented. Can be. According to the device of the third aspect, the rotation driving of the crushing claw can be controlled by detecting the torque at the time of crushing using a torque meter as a sensor.

According to the crushing peeling apparatus according to claim 4, since the scoop raised scale crushing claw will be divided by the second crushing claw, blotted in vacuum by more finely chopped scale layer Can be easily done.

[0034] As in the apparatus according to claim 5, by forming the crush nail tip as forward and reverse direction in either direction is the same at an acute angle, there is no need to change the direction of crushing claw conversely . According to the crushing and peeling apparatus according to claim 6 , the scale in the entire heating furnace can be crushed and peeled by moving on the scale by mechanical force, and can be introduced without remodeling existing equipment. Can be crushed with a small crushing force because it is driven into the scale layer and digs in horizontally, and it is easy to crush, and has less reaction force compared to crushing work from above using an excavator Therefore, the crushing and peeling operation can be effectively performed even with a small and lightweight one.

[0035] According to the crushing peeling apparatus according to claim 7, since the hammer and the centrifugal inertial force due to the rotation of the rotating body, increase in the angular acceleration by the weight of the hammer is driven into the scale layer to join, crushing force increases At the same time, the impact force at the time of crushing is reduced, and damage to the hammer and the rotating body due to excessive impact force can be prevented. If a plurality of hammers are provided as in the crushing and peeling apparatus according to claim 8 , the rotating body is balanced and the rotating body is smooth, and the crushing and peeling speed of the scale is increased, thereby improving the work efficiency.

According to the crushing and separating apparatus of the ninth aspect, the crushing and separating work of the scale can be performed and the weight of the hammer head is increased irrespective of whether the moving vehicle is moved in any of the front and rear directions. The crushing power is improved. According to the crushing and peeling device of the tenth aspect , by detecting the contact of the rotating body with the scale layer by the sensor, it is possible to grasp that the crushing and peeling operation by the hammer is being performed.

[Brief description of the drawings]

FIG. 1 is a side view of a crushing and peeling machine according to the present invention.

FIG. 2 is an enlarged side view of a hammer attached to a rotating body.

FIG. 3 is a side view of another crushing and peeling machine.

FIG. 4 is a plan view of the same.

FIG. 5 is a front view of a crushing ratchet.

FIG. 6 is a front view of another crushing ratchet.

FIG. 7 is a perspective view of another crushing drum.

FIG. 8 is a perspective view of still another crushing drum.

[Explanation of symbols]

2 ··· Scale layer 3 · 23 ··· Moving vehicle 4 · 24 ··· Crushing and peeling mechanism 5 ··· Frame 6 ··· Arm 7 ··· Hydraulic cylinder 8/22/32 ··· Motor 9 · ..Belt transmission device 11 ... Rotating body 12 ... Pin 13 ... Hammer 26 ... Support table 27 ... Cylinder 28 ... Arm 29,41,44 ... Crushing drum 35 ...・ Crushing claw 33, 34, 38, 39, 42, 45: Crushing claw 36: Drive shaft 46: Torque meter 43: Blade

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuhiko Nakano 111-1 Showa-cho, Kure City, Hiroshima Prefecture Inside Nisshin Steel Co., Ltd. Kure Works (72) Inventor Tsutomu Honda 11-1 Showa-cho, Kure City, Hiroshima Prefecture No. Nisshin Steel Co., Ltd. Kure Works (72) Inventor Nobuhiko Kinchika 11-1 Showa-cho, Kure City, Hiroshima Prefecture Nisshin Steel Co., Ltd. Kure Works (56) References JP-A 64-32200 (JP) , A) Real opening 58-160258 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F27D 1/16 F27D 23/02 C21D 1/00 112 C21B 7 / 06,7 / 14

Claims (10)

(57) [Claims] An apparatus for crushing and separating scales deposited on a hearth of a heating furnace for heating a slab, wherein the scale is deposited on the hearth of the heating furnace.
A mobile vehicle capable of self-propelling on the scale layer
X-axis, y-axis, z-axis or these depending on the installed driving source
Drives around an axis inclined at an appropriate angle to the axis of
And a crushing claw which is provided . 2. The apparatus according to claim 1, further comprising a sensor for detecting when the crushing claw hits the hearth of the heating furnace, and stopping the rotation of the crushing claw when a detection signal is transmitted from the sensor. Crushing and peeling equipment . 3. The crushing and separating apparatus according to claim 2 , wherein the sensor is a torque meter. 4. The crushing and peeling device according to claim 1, wherein the crushing claw is provided with a blade-shaped second crushing claw on at least one side so as to be warped sideways. 5. The crushing and separating apparatus according to claim 1, wherein the crushing claws are formed so as to have the same direction in both the forward and reverse rotation directions. 6. A device for crushing and separating scales deposited on a hearth of a heating furnace for heating a slab, comprising: a movable vehicle capable of self-propelling on a scale layer; A crushing / separating apparatus comprising: a driven rotating body; an elevating mechanism for lifting and lowering the rotating body; and a hammer attached to the rotating body and rotating with the rotating body. 7. The crushing and peeling device according to claim 6 , wherein the hammer is rotatably attached to the outer periphery of the rotating body with a pin. 8. hammer rotator crushing device for peeling off a plurality mounting is claim 6 or 7, wherein at regular intervals on the outer circumference of. 9. The crushing and peeling device according to claim 6, wherein the hammer has a T shape. 10. The crush separation apparatus according to claim 6, further comprising a sensor for detecting contact of the rotating body with the scale.