JPH0314523B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a vertical rolling mill.

Vertical rolling mills are generally used to form strips into a predetermined width. However, in this type of conventional vertical rolling mill, a vertical roll unit is provided in an inner housing that is slidably provided in the housing, and the inner housing is moved by a motor to roll a pair of vertical rolls. The spacing, that is, the width of the strips can be adjusted. However, in conventional vertical rolling mills, the weight of the inner housing is large, so it is difficult to move the inner housing smoothly, and it is also difficult to adjust the width of the strip quickly and accurately. There was a drawback.

Therefore, a vertical roll unit is slidably provided in the inner housing, and the upper and lower chock of the vertical roll is pressed in the width direction of the strip plate by a hydraulic cylinder mechanism, and the position of these hydraulic cylinder mechanisms is detected. A vertical rolling mill was developed in which the width of the strip was adjusted by controlling a hydraulic cylinder mechanism based on the detected values, and the application was previously filed as Utility Model Application No. 1983-99250. . However, in the vertical rolling mill according to this application, when the vertical roll unit is displaced by the hydraulic cylinder mechanism, a frictional resistance force is generated between the vertical roll unit and the inner housing. The position sensor that detects the position of the hydraulic cylinder mechanism detects the frictional resistance force as well as the position of the hydraulic cylinder mechanism, and therefore the output of the position sensor is unreliable, making it difficult to accurately adjust the width of the strip. There was a problem.

The present invention has been made in view of the above circumstances, and includes providing a load cell between a rolling screw that receives a rolling load and an inner housing, and controlling a hydraulic cylinder mechanism based on the output signal of the load cell. Accordingly, it is an object of the present invention to provide a vertical rolling mill that has high reliability and can accurately adjust the width of a strip.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the figure, 1 is a frame-shaped upper housing, and 2 is a frame-shaped lower housing. Left and right inner housings 3 are attached to the upper housing 1 so as to be slidable in the width direction of the band plate 4, that is, in the directions of arrows A and B, guided by both housings 1 and 2. Further, the housings 1 and 2 are provided with reduction screws 5 and 6. These screws 5 and 6 are transmitted with the driving force of a motor (not shown) through worms 7 and 8, worm wheels 9 and 10, etc., and are moved in the direction of arrow A or B while rotating in forward and reverse directions. This allows the inner housing 3 to slide in the direction of arrow A or B. Note that load meters 11 and 12 are provided between the reduction screws 5 and 6 and the inner housing 3.

The inner housing 3 is provided with upper and lower chock guide protrusions 13 and 14, and these protrusions 13 and 14 allow the upper and lower chock 16 and 17 of the roll unit 15 to slide in the directions of arrows A and B. It is placed freely. Also, the top and bottom ticks 16,
17 is configured to be pressed in the width direction of the strip plate 4 by hydraulic cylinder mechanisms 18 and 19 provided in the inner housing 3. The vertical roll unit 15 has a vertical roll 20 rotatably provided between upper and lower jocks 16 and 17. The vertical roll 20 is rotated in a predetermined direction by transmitting the driving force of a motor 21 via a spline shaft 22, bevel gears 23, 24, a shaft 25, a coupling 26, and the like. Note that 27 is an accelerometer provided at a predetermined location of the inner housing 3, and 28 is a roller conveyor for conveying the strip plate 4.

29 is a vertical roll position setter, the output of which is supplied to the input terminal of a comparison adder 30, and another input terminal of this comparison adder 30 is connected to the lower load cell 1.
The output of 2 is supplied via an amplifier 31. Further, the output of the position detector 38 is supplied to the input terminal of the comparison adder 30. The output of the compare adder 30 is fed to the input of another compare adder 32, which also has an accelerometer 27 at another input.
The output is supplied via an amplifier 33. The output of the comparison adder 32 is used to control the hydraulic servo valves 34 and 35. Note that the hydraulic servo valves 34 and 35 are
Piping 3 connected to hydraulic cylinder mechanisms 18 and 19
It is interposed between 6 and 37.

Therefore, when a predetermined roll gap is first set in the vertical roll position setting device 29, the hydraulic servo valve 3
4 and 35 operate, and the hydraulic cylinder mechanisms 18 and 19
As a result, a rolling force is applied to the vertical rolls 20 to form a predetermined roll gap. And motor 2
The strip plate 4 is rolled to a predetermined width by a vertical roll 20 rotated by the roller 1.

However, when the strip 4 is rolled in this way, when the width of the strip 4 exceeds a set value, that is, when the vertical rolls 20 are separated from each other, the rolling load applied to the rolling screw 6 increases. The load cell 12 detects this and inputs the detection signal to the comparison adder 30, which causes the output from the comparison adder 30 to become high, which in turn causes the output from the comparison adder 32 to become high. The hydraulic servo valves 34 and 35 are brought into the oil supply state, the oil pressure in the cylinders of the hydraulic cylinder mechanisms 18 and 19 is increased, and the vertical rolls 20 are brought closer to each other to control the rolling position. On the other hand, when the width of the strip 4 becomes less than the set value, that is, when the vertical rolls 20 are brought closer to each other, the rolling load applied to the rolling screw 6 becomes smaller, and the load meter 12 detects this and applies the corresponding weight. The detection signal is input to the comparison adder 30, which causes the output from the comparison adder 30 to be low;
As a result, the output from the comparison adder 32 becomes low, causing the hydraulic servo valves 34 and 35 to be in the oil discharge state, lowering the oil pressure in the cylinders of the hydraulic cylinder mechanisms 18 and 19, and thus separating the vertical rolls 20 from each other to control the rolling position. By the way, when the vertical roll 20 is displaced by the hydraulic cylinder mechanisms 18 and 19, the space between the upper and lower jocks 16 and 17 and the inner housing 3, that is, the protruding portion of the inner housing 3 13, 14 and the sliding surfaces of chock 16, 17 (upper protrusion 1
3 and the sliding surface of the chock 16 are shown in Figures 1 and 2.
(indicated by the symbol P in the figure), those checks 1
6 and 17 slide in the plate width direction, a frictional resistance force is generated, but this frictional resistance force is
It has no effect on.

That is, even if the vertical roll 20 is displaced by the hydraulic cylinder mechanisms 18 and 19, the vertical roll unit 1
5 is only displaced inside the inner housing 3, and the inner housing 3 remains in the same position without being displaced. Therefore, since the inner housing 3 does not slide against the upper housing 1, a frictional resistance force is generated on the sliding surfaces (indicated by Q in FIGS. 1 and 2). Therefore, load cell 11,
Since the detected value 12 is not affected by such frictional resistance, the width of the strip plate 4 can be adjusted accurately.

Note that, as described above, the hydraulic cylinder mechanism 18,
Although the inner housing 3 remains in the same position even if the vertical roll 20 is displaced by the roller 19, elastic deformation occurs in the inner housing 3, the rolling screw 6, the upper housing 1, etc. during rolling, and as a result, the rolling of the vertical roll 20 The position may be incorrect. Therefore, it is desirable to compensate for these elastic deformations.
Therefore, this will be discussed below. When the above-mentioned elastic deformation occurs during rolling, the amount of the deformation is elastically proportional to the inertial force applied to the inner housing 3. Since the inertial force applied to the inner housing 3 is the product of the acceleration α applied to the inner housing 3 and the mass M of the inner housing 3, the acceleration α is detected by the accelerometer 27,
The amplifier 33 multiplies the detected value by a known mass M and divides it by a known elastic change spring constant K, that is, by performing the calculation α×M/K, the detected value is detected by the accelerometer 27. Acceleration α
The amount of deformation of the inner housing 3 is detected based on the value of . Then, the result is input to the comparison adder 32, which increases the output from the comparison adder 32, puts the hydraulic servo valves 34 and 35 into the oil supply state, and reduces the oil pressure in the cylinders of the hydraulic cylinder mechanisms 18 and 19. Thus, the vertical rolls 20 are moved closer to each other to compensate for the elastic deformation described above. In this way, the width of the strip plate 4 can be adjusted even more accurately.

In addition, in the above embodiment, the lower load cell 12
Although the hydraulic cylinder mechanisms 18 and 19 are controlled only by the upper load cell 11, it is of course possible to control the hydraulic cylinder mechanisms 18 and 19 by only the upper load cell 11 or by both load cells 11 and 12. . However, since the lower load cell 12 is located near the rolling load generation area, that is, the vertical roll 20, it is sufficient to control the load cell 12 only using this load cell 12.

As explained above, according to the vertical rolling mill of the present invention, a load cell is provided between the rolling screw receiving the rolling load and the inner housing, and the hydraulic cylinder mechanism is controlled based on the output signal of the load cell. Because of this configuration, even if a frictional resistance force is generated between the vertical roll unit and the inner housing when the vertical roll unit is displaced by the hydraulic cylinder mechanism, this frictional resistance force will not affect the load cell in any way. Therefore, the output of the load meter is highly reliable, and the width of the strip plate can be adjusted accurately.

Furthermore, if an accelerometer is provided in the inner housing and the hydraulic cylinder mechanism is further controlled based on the output signal of the accelerometer, even if elastic deformation occurs in the inner housing etc. during rolling, this elastic deformation can be compensated for. This has the effect that the width of the strip can be adjusted even more accurately.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of a vertical rolling mill according to the present invention, and FIG. 2 is a diagram schematically showing an inner housing portion thereof. 1, 2...Housing, 3...Inner housing, 4...Strip plate, 5, 6...Down screw, 1
1, 12...Load cell, 13, 14...Protrusion part, 1
5... Vertical roll unit, 16, 17... Chock, 18, 19... Hydraulic cylinder mechanism, 20...
Vertical roll, 27... Accelerometer, 29... Vertical roll position setter, 30, 32... Comparison adder, 34,
35...Hydraulic servo valve.

Claims (1)

[Scope of Claims] 1. A vertical roll unit is slidably provided on an inner housing that is slidably provided on the housing, a hydraulic cylinder mechanism that determines a lowering position is provided on the inner housing, and the inner housing is provided with a hydraulic cylinder mechanism that determines a lowering position. In a vertical rolling mill provided with a rolling screw that receives a rolling load through a housing, a load cell is provided between the rolling screw and the inner housing, and the output signal of the load cell is input to the hydraulic cylinder. A vertical rolling mill characterized by being provided with a control mechanism for controlling the rolling position of the mechanism. 2. An accelerometer is provided in the inner housing, and the output signal of the accelerometer is input to the control mechanism and added to the output signal from the load meter to control the downward position of the hydraulic cylinder mechanism. A vertical rolling mill according to claim 1, characterized in that: