JPS6246285B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic control method for a steel billet removing machine and a hydraulic control device thereof.

Surface defects such as cracks and sludge defects that occur during steelmaking and blooming have a large effect on the quality of steel slabs, and removal of these defects is an important issue in terms of quality control. Therefore, for example, as disclosed in Japanese Patent Publication No. 55-25006, the surface flaws of a steel piece are detected using a flaw detector installed on a flaw detection line, and then the steel piece is charged into a flaw removing line and the flaws are removed. While the steel billet is conveyed in the longitudinal direction by a conveyance roller table on the line, surface flaws on the steel billet are removed by a flaw removal machine. This type of flaw removing machine uses a drive roller and a driven roller to sandwich the steel piece conveyed by a conveying roller table, and while the flaw removing machine body follows the bending etc. of the steel piece, the flaw removing machine There is a type that cuts surface flaws in steel pieces using a cutter installed in the main body. However, in the past, the main body of the flaw removal machine was simply supported in a floating state, so for example, if the steel billet was bent so that the center part in the longitudinal direction was curved upwards, the main body of the flaw removal machine When cutting surface flaws while feeding the steel piece by clamping it, the leading end of the steel piece may collide with the starting end of the conveyance roller table on the conveyance direction side, making it impossible to feed it. Moreover, if the entire weight of the flaw removing machine body was applied to the conveying roller table via the steel piece, the tip of the steel piece would bite into the conveying roller table, making it impossible to feed the piece. For this reason, in the past, material properties such as curvature of the steel billet had an adverse effect on cutting performance, and there was a drawback that the state of flaw removal varied significantly depending on the material properties.

The present invention was provided for the purpose of solving such conventional problems, and its first feature is that the steel billet is conveyed in the longitudinal direction by a conveyance roller table. A steel billet crack removal machine that cuts surface flaws from the steel billet with a cutter on the billet removal machine body while holding the billet between the billet removal machine body and operating a lifting cylinder to cause the billet removal machine body to follow the steel billet. After the steel billet is clamped, the tip end of the steel billet is placed in a cutting position where it floats above the conveyance roller table until the tip of the steel billet passes the starting end of the conveyance roller table on the conveyance direction side. After the tip of the steel billet exceeds the starting end, the billet is placed on a conveying roller table and an underbalance state is created in which only the weight of the flaw removing machine body is hydraulically balanced with the lifting cylinder. The second feature is that the steel piece conveyed in the longitudinal direction by the conveying roller table is held by the flaw removal machine body, and the lifting cylinder is operated to lift the flaw removal machine body. In a steel billet removing machine that cuts surface flaws from a steel billet with a cutter on the machine body while following the steel billet, a steel billet held in the spot removal machine body is connected to a hydraulic circuit that controls a lifting cylinder. A positioning function that operates a lifting cylinder to hold the tip of the steel in a cutting position where it floats above the conveyance roller table on the conveyance direction side, and a Creates an underbalance state in which only the weight of the machine body is hydraulically balanced with the lifting cylinder, and operates the lifting cylinder to raise the flaw removal machine body by sensing the reaction force from the billet transport roller table. The main point is that it has a weight balance function that makes it easier to use.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. In FIGS. 1 and 2, 1 is a steel piece, which is conveyed in the longitudinal direction by front and rear conveyance roller tables 2 and 3. Reference numeral 4 denotes a flaw removing machine body, which includes upper and lower clamping frames 5 and 6 arranged vertically perpendicular to the conveyance direction of the steel material 1, and pins 7 and 7 on the clamping frames 5 and 6.
A pair of left and right tightening cylinders 9 connected via 8
and two sets of driving roller units 10 and driven roller units 11 arranged to sandwich the steel piece 1.
and four sets of cutter units 12, which are configured to clamp and feed the steel piece 1 and cut surface flaws. A pair of left and right mounting frames 14 are pivotally connected to a bracket 13 attached to the lower surface of the upper tightening frame 5 by pins 15 parallel to the conveying direction of the steel piece 1, and the lower tightening frame 6
A pair of left and right mounting frames 17 are pivotally connected to a bracket 16 attached to the upper surface of the frame by pins 18, and each of these mounting frames 14, 17 is connected to the pins 15, 18 on the opposite side of the steel piece 1. The upper and lower tightening frames 5 and 6 are held by the posture holding devices 19 and 20.
are installed respectively. As shown in FIG. 3, the pair of left and right mounting frames 14 are provided with a pair of front and rear drive rollers 21 and a drive motor 22 that drives them.
Each of the drive roller units 10 is equipped with a rotation shaft 2 of the drive roller unit 10.
A swinging arm 24 that can freely swing about three rotations is provided so as to protrude back and forth. Each swing arm 24 is equipped with a cutter unit 12 having a cutter 25 and a drive motor 26 for driving the cutter, and the swing arm 24 is connected to an operating cylinder 27 interposed between the swing arm 24 and the mounting frame 14. This allows the cutter unit 12 to be operated toward and away from the surface of the steel piece 1 to be cut. Pair of left and right mounting frames 1
7 is the drive roller 2 of each drive roller unit 10.
1 and between the steel piece 1 and the drive roller 21.
A pair of front and rear driven rollers 28 are freely rotatably mounted so as to sandwich the driven roller 2.
A measuring roller 29 is provided so as to be located between 8 and 8. Note that the drive roller 21, cutter 25, driven roller 28, etc.
They are arranged in the positional relationship shown in the figure.

30 is a frame body, this frame body 30
A pair of left and right lifting cylinders 32 are provided above for raising and lowering the flaw removal machine main body 4 via a cable 31 such as a chain. The lifting cylinder 32 is a double-acting hydraulic type, and is attached to a bracket 33 on the frame body 30.
It is pivoted to. The cable 31 has one end connected to the tip of the piston rod 34 of the lifting cylinder 32, and the other end connected to the end of the upper tightening frame 5 via a connector 35, and is guided by a guide ring 36 in the middle. There is. There are a pair of guide shafts 36 on the left and right,
Each of them is attached to a bracket 37 on the frame body 30.
The support shaft 38 is rotatably supported by a support shaft 38, and the support shaft 38 is linked to a positioning detector 39 such as a pulse generator mounted on the frame main body 30.

FIG. 4 shows a hydraulic circuit that controls the lifting cylinder 32, and this hydraulic circuit operates until the tip of the steel piece 1 passes over the starting end of the conveyance roller table 3 on the conveyance direction side after the steel piece 1 is clamped. In between, a positioning function holds the steel billet 1 at a cutting position floating above the conveyance roller table 3, and after the tip of the steel billet 1 exceeds the starting end, only the weight of the flaw removing machine body 4 is transferred. It has a weight balance function that creates an underbalance state in which hydraulically balances the lifting cylinder and raises the flaw removal machine main body 4 by sensing the reaction force from the conveying roller table 3 of the steel billet 1. That is, 40 and 41 are solenoid valves;
41 has solenoids 42 and 43 for lifting and solenoids 44 and 45 for lowering. Reference numerals 46 to 49 indicate check valves with an operator, which are used to prevent the lifting cylinder 32 from operating during a power outage. 50～
Reference numeral 53 denotes a flow control valve with a check valve, which is used to adjust the speed when the lifting cylinder 32 is pulled up and lowered.
Denoted at 54 and 55 are heavy magnetic valves for weight balance, which have solenoids 56 and 57. 58 is a relief valve,
It is configured to operate with pressure equal to the weight of the flaw removing machine body 4, and operates during low-speed balance and high-speed balance. 59 is a flow control valve with a check valve, which regulates the descending speed of the steel billet 1 due to its own weight during low speed balance. Reference numeral 60 denotes a flow control valve, which is used to replenish the amount of oil escaping from the relief valve 58 during low speed balance. 61 and 62 are check valves, and 63 is a shuttle valve, which is configured to open the check valve 49 with an operator during high-speed balance and low-speed balance. Note that the function of the shuttle valve 63 itself is to regulate the high pressure input side. Reference numerals 64 and 65 are check valves for preventing negative pressure in the lifting cylinder 32 during low speed balance. 70 is a check valve with an operator.

In FIGS. 1 and 2, 66 and 67 are guide rollers, and 68 and 69 are damper devices.

Next, the operation of the above configuration will be explained. Steel piece 1
When waiting for the frame to be transported, the tightening cylinder 9 extends to open the space between the upper and lower tightening cylinders 5 and 6, and the lifting cylinder 32 contracts to pull up the upper tightening frame 5 to the maximum extent possible. There is. In other words, the steel piece 1 is in a state where it is easy to enter the flaw removal machine main body 4. The tip of the steel piece 1 is connected to the conveyor roller table 2 and the guide roller 6.
6 and reaches the flaw removing machine body 4, the lifting cylinder 32 is actuated in the downward direction by a signal from a detector (not shown) to lower the flaw removing machine main body 4, and the tightening cylinder 9 is actuated to remove the steel piece. Tighten 1. That is, the lowering solenoids 44 and 45 of the solenoid valves 40 and 41 are energized by the signal from the detector, and the lowering solenoids 44 and 45 of the solenoid valves 40 and 41 are excited.
1 switches to the downward direction, pressure oil from the pump is supplied to the lifting cylinder 32 via the solenoid valves 40, 41 and check valves 46, 48, and the lifting cylinder 32 operates at high speed in the downward direction. Then, the upper tightening frame 5 side of the flaw removing machine main body 4 descends at high speed. This amount of descent is detected by a detector 39, and when the solenoid 45 of the solenoid valve 41 is demagnetized by a signal from the detector 39 and returns to neutral when it descends to a predetermined position at high speed, the upper tightening frame 5 Switching to a slow descent via 40. When a predetermined cutting position is reached, the solenoid valve 40 also returns to neutral, and the upper clamping frame 5 stops descending. Meanwhile, at the same time or with a certain time difference, the tightening cylinder 9 operates to pull up the lower tightening frame 6 and clamp the steel piece 1 from above and below by the driving roller 21 and the driven roller 28. Enter cutting preparation state. In this state, the steel billet 1 is at a cutting position floating upward from the conveyance roller table 3 as shown in FIG. 5, and this cutting position is determined by taking into consideration the amount of bending of the steel billet 1 and the like. This state is maintained until the tip of the steel billet 1 reaches the starting end of the conveyance roller table 3, so that the tip of the steel billet 1 hits the starting end of the conveyance roller table 3 and cannot be fed. It won't happen. During this time, if the steel piece 1 falls below the cutting position due to oil leakage from the lifting cylinder 32, the solenoid 42 of the solenoid valve 40 is energized by a signal from the position detector 39, and the lifting cylinder 32 moves in the lifting direction. The flaw removing machine body 4 is raised and the steel piece 1 is returned to the cutting position. If the steel piece 1 is placed above the cutting position, the solenoid 44 of the solenoid valve 40 is energized to lower the flaw removing machine body 4. In this way, the steel piece 1
Positioning control is performed to position the machine at a predetermined cutting position.

When the tip of the steel piece 1 reaches the starting end of the conveyor roller table 3, a weight balance command is input from the measuring roller 29 via the length measuring device, the solenoid valve 54 for low speed balance is energized, and the flow control valve 6 is energized.
0. Apply pressure oil to the lifting side of the lifting cylinder 32 via the solenoid valve 54. At this time, since the load of the flaw removal machine main body 4 and the steel slab 1 is acting on the lifting cylinder 32, the relief valve 58 works, and the lifting cylinder 32
is operated in the downward direction via the check valve 70 at a low speed set by the flow rate control valve 59, and the steel billet 1 is lowered. After estimating with a timer or the like that the steel piece 1 has been placed on the conveyance roller table 3, the process shifts to high-speed balance control and begins cutting work for surface flaws. In high-speed balance, the solenoid 4 of the solenoid valve 41 is excited and switched to the lifting direction, and
The solenoid valve 55 is energized and opened to maintain a balanced state. That is, when the electromagnetic valve 41 is switched to the lifting direction, pressure oil from the pump is applied to the lifting side of the lifting cylinder 32 via the electromagnetic valve 41 and the flow control valves 52 and 53. At this time, if the steel slab 1 is floating above the roller table 3, the relief valve 58 will open due to the weight of the flaw removing machine body 4 and the steel slab 1, and the pressure oil will flow through the solenoid valve 55 and the relief valve. Escaped through 58,
The lifting cylinder 32 is extended, the flaw removing machine body 4 is lowered, and the steel piece 1 is placed on the roller table 3. Therefore, normally, the lifting cylinder 32 is controlled so that it is balanced only with the weight of the flaw removal machine main body 4, and the weight of the flaw removal machine main body 4 does not act on the conveyance roller tables 2 and 3. Furthermore, when the steel piece 1 is bent or the like and a reaction force is suddenly generated on the conveying roller table 3, this acts on the flaw removing machine body 4, and the internal pressure of the lifting cylinder 32 instantly decreases, causing relief. Since the valve 58 is closed, pressure oil is sent to the lifting cylinder 32 and it operates in the upward direction, raising the flaw removal machine body 4 and preventing the steel billet 1 from hitting the conveyance roller table 3. Therefore, the steel billet 1 can be fed smoothly regardless of bends, etc., and the flaw removal performance is significantly improved.

When a flaw signal is received in accordance with preset flaw position information, the cutter unit 12 is operated at the flaw position, and the rotating cutter 25 cuts and removes the surface flaw on the steel piece 1. That is, when there is a flaw signal, the cutter 25 moves in the width direction of the surface to be cut to the flaw position, the operating cylinder 27 is operated to perform a predetermined cutting operation, and the cutter 25 cuts the flaw. The flaw position is calculated by measuring the distance of movement of the steel piece 1 using a measuring roller 29.

After removing the flaw, the solenoid 43 of the electromagnetic valve 41 is energized and the lifting cylinder 32 returns it to the initial position.

As described in detail in the embodiments above, according to the method of the present invention, after the steel billet is clamped by the flaw removing machine body, the steel strip is The tip of the steel piece is held at the cutting position where it floats above the conveyance roller table, and after the tip of the steel piece passes the starting end, the piece is placed on the conveyance roller table and removed from the flaw removing machine body. Since only the weight is hydraulically balanced with the lifting cylinder, an underbalance condition is created, so even if the billet is bent such that the longitudinal center is curved upward, the tip of the billet will be on the conveying direction side. The steel strip may collide with the starting end of the conveyor roller table and become unfeedable, or the entire weight of the flaw removing machine body may be applied to the conveyor roller table during flaw removal, and the tip of the steel piece may get wedged in the middle of the conveyor roller table and be fed. Therefore, the steel billet can be fed very smoothly, and adverse effects on the flaw removal state due to material properties such as bending of the steel billet can be prevented. Further, since the weight of the flaw removing machine body does not directly act on the conveying roller table, the conveying roller table can be made simple and compact.

Furthermore, according to the device of the present invention, it can be processed circuit-wise using a hydraulic circuit, so it is easy to implement. Furthermore, by providing a function to lift the flaw removing machine body by sensing the reaction force of the steel billet, the weight balance can be further improved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a partially cutaway side view, FIG. 2 is a partially cutaway rear view, FIG. 3 is an enlarged view of the main parts, FIG. 4 is a hydraulic circuit diagram, and FIG. FIG. 5 is an explanatory diagram of the operation, and FIG. 6 is a schematic perspective view of the flaw removal section. 1... Steel billet, 2, 3... Conveyance roller table,
4... Scratch removal machine main body, 10... Drive roller unit, 11... Driven roller unit, 12... Cutter unit, 30... Main body frame, 32...
Lifting cylinder, 40, 41, 56, 57... solenoid valve.

Claims (1)

[Scope of Claims] 1. A steel billet conveyed in the longitudinal direction by a conveyance roller table is held between a flaw removing machine body, and while a lifting cylinder is operated to cause the flaw removing machine body to follow the steel billet, In a steel billet flaw removing machine that cuts surface flaws on a steel billet using a cutter on the machine body, after the steel billet is clamped, the tip of the steel billet passes over the starting end of the conveyance roller table on the conveyance direction side. During this time, the tip side of the steel billet is held at a cutting position where it floats above the conveyance roller table, and after the tip of the steel billet exceeds the starting end, the steel billet is placed on the conveyance roller table. A hydraulic control method for a steel billet removing machine, characterized in that an underbalance state is created in which only the weight of the machine body is hydraulically balanced with a lifting cylinder. 2. Holding the steel billet conveyed in the longitudinal direction by the conveyance roller table between the defect removal machine body and operating the lifting cylinder to make the defect removal machine body follow the steel billet, In a billet removal machine that uses a cutter to remove surface flaws from a steel billet, a hydraulic circuit that controls a lifting cylinder is used to move the tip of the billet held between the machine body above the conveyance roller table in the conveyance direction. The positioning function operates the lifting cylinder to hold the scraping machine in the floating cutting position, and when removing defects with the steel piece placed on the conveyor roller table, only the weight of the flaw removal machine body is hydraulically connected to the lifting cylinder. It is characterized by having a weight balance function that creates an underbalance state for balancing, and operates a lifting cylinder to raise the flaw removing machine body by sensing the reaction force from the conveying roller table of the steel billet. Hydraulic control device for steel billet removal machine.