JP6720941B2 - Plate thickness measuring device - Google Patents

Description

The present invention relates to a plate thickness measuring device that is installed in a steel plate rolling line to measure the plate thickness.

A rolling line for manufacturing a steel plate such as a thick plate by continuously rolling a steel material is generally equipped with a plate thickness measuring device for measuring the plate thickness of the steel plate (for example, Patent Literature 1).

FIG. 3 is a schematic view showing a conventional plate thickness measuring device. In the plate thickness measuring device 91 shown in FIG. 3, a plurality of pedestals 93 are attached on a bed plate 92, a beam 94 is installed between the pedestals 93 so as to be perpendicular to the rolling direction, and the beams 94 are placed on the beams 94. A gamma ray plate thickness meter 95 is provided.

Here, in order to accurately measure the plate thickness, it is necessary to suppress the vibration of the plate thickness measuring device. If the vibration of the plate thickness measurement device is large, the measurement accuracy of the plate thickness measurement device may be reduced, or the measurement itself may become impossible depending on the degree of vibration.As a result, the manufactured steel plate may have uneven plate thickness. Become.

As described above, it is very important to reduce the vibration of the plate thickness measuring device in the steel plate rolling line in order to improve the quality and the productivity.

JP-A-5-228522

However, in the case of the conventional plate thickness gauge device 91 as shown in FIG. 3, the impact vibration of the rolling mill at the time of rolling propagates through the bed plate 92, and the pedestal 93 and the beam 94 installed on the bed plate 92 move. Easy to vibrate in the rolling direction. As a result, the gamma ray plate thickness gauge 95 installed on the beam 94 also vibrates in the rolling direction.

The present invention has been made in view of the above problems, and an object thereof is as a plate thickness measuring device installed in a rolling line for steel plates, which is less susceptible to impact vibration of a rolling mill during rolling, and vibration is An object of the present invention is to provide a plate thickness measuring device that is suppressed and has good measurement accuracy.

The present invention has been made in order to solve the above problems, and its gist configuration is as follows.

[1] A plate thickness measuring device installed on a steel plate rolling line,
A γ-ray plate thickness meter that measures the plate thickness of the steel plate during rolling,
A beam installed with the γ-ray plate thickness gauge and installed parallel to the rolling direction,
A mount supporting the beam,
A plate thickness measuring device comprising:

[2] The plate thickness measuring device according to the above [1], wherein the gantry is installed on a concrete foundation insulated from the rolling mill.

[3] On the beam, as a vibration reduction device, a dynamic vibration absorber including a mass body to be added to the vibration suppression target object and a spring and a damper interposed between the mass body and the vibration suppression target object is provided. However, the damper is attached to each of the mass body and the vibration damping object via a spherical bearing, and the plate thickness measuring device according to the above [1] or [2].

[4] As a vibration reduction device, a vibration isolator including a spring and a damper is provided between the gamma ray plate thickness gauge and the beam, and the gamma ray thickness gauge is supported by the vibration isolator. The plate thickness measuring device according to any one of the above [1] to [3].

In the present invention, as a plate thickness measuring device installed on a steel plate rolling line, to obtain a plate thickness measuring device which is hardly affected by vibration of a rolling mill during rolling, vibration is suppressed, and measurement accuracy is good. You can

It is a schematic diagram showing composition of a plate thickness measuring device concerning Embodiment 1 of the present invention. It is a schematic diagram showing composition of a plate thickness measuring device concerning Embodiment 2 of the present invention. It is a schematic diagram showing the composition of the conventional board thickness measuring device. It is a conceptual diagram of the vibration reduction apparatus used in Embodiment 3 of this invention. It is a figure which shows the spherical bearing of the vibration reduction apparatus used in Embodiment 3 of this invention. It is a schematic diagram showing composition of a plate thickness measuring device concerning Embodiment 3 of the present invention. It is a graph which compared the maximum value of vibration acceleration in the Example of this invention. It is a graph which compared the average value of vibration acceleration in the Example of this invention.

An embodiment of the present invention will be described with reference to the drawings.

[Embodiment 1]
FIG. 1 is a schematic diagram showing a plate thickness gauge measuring device 1A according to a first embodiment of the present invention.

As shown in FIG. 1, the plate thickness measuring device 1A according to the first embodiment is installed in a rolling line, a plurality of pedestals 3 are mounted on a bed plate 2, and rolling is performed between the pedestals 3 and 3. The beam 4 is installed so as to be parallel to the direction, and the gamma ray plate thickness gauge 5 is provided on the beam 4. Then, the γ-ray plate thickness gauge 5 irradiates a steel plate (not shown) passing thereabove in the rolling direction with γ-rays to measure the plate thickness of the steel plate.

As described above, in the strip thickness measuring device 1A according to the first embodiment, the beam 4 is installed so as to be parallel to the rolling direction, and thus the impact vibration during rolling is less likely to be affected. As a result, compared to the conventional thickness gauge measuring device 91 shown in FIG. 3, the vibration (for example, amplitude and vibration acceleration) of the thickness measuring device 1A is reduced, and the thickness can be accurately measured. Become.

[Embodiment 2]
FIG. 2 is a schematic diagram showing a thickness gauge measuring device 1B according to a second embodiment of the present invention.

As shown in FIG. 2, the basic configuration of the plate thickness measuring device 1B according to the second embodiment is the same as that of the plate thickness measuring device 1A according to the above-described first embodiment, but the plate thickness measuring device 1A has a bed plate. 2, a plurality of pedestals 3 are mounted on the plate 2, whereas the thickness gauge measuring apparatus 1B is different in that the gantry 3 is mounted on the concrete foundation 6 insulated from the rolling mill.

As described above, in the plate thickness measuring device 1B according to the second embodiment, the pedestal 3 is mounted on the concrete foundation 6 that is insulated from the rolling mill, so that it is further less susceptible to the impact vibration during rolling. .. As a result, compared with the conventional thickness gauge measuring device 91 shown in FIG. 3, it is possible to further reduce the vibration (for example, amplitude and vibration acceleration) of the thickness measuring device 1B and measure the thickness accurately. Becomes

[Third Embodiment]
The plate thickness measuring device 1A according to the first embodiment and the plate thickness measuring device 1B according to the second embodiment may further include a vibration reducing device (dynamic vibration absorber, vibration isolator). By providing a vibration reduction device (dynamic vibration absorber, vibration isolator), it is possible to further reduce the vibration of the plate thickness measurement device.

In the third embodiment of the present invention, such a vibration reducing device (dynamic vibration absorber) is installed.

First, FIG. 4 shows a basic conceptual diagram of the vibration reduction device used in the third embodiment.

When vibration due to resonance is dominant in the vibration suppression target 12, the vibration suppression target 12 is supported by a weight 16 supported by a spring 17 fixed to the foundation B and a damper 18, as shown in FIG. It can be replaced. The vibration reducing device 11 is composed of a dynamic vibration absorber 11a including a weight (mass body) 13 added to the weight 16 and a spring 14 and a damper 15 interposed between the weight 13 and the weight 16. To be done. The weight 13 is placed on the weight 16 via, for example, a linear slider so that the weight 13 can freely move in the same direction as the vibration direction of the weight 16, and the spring 14, the weight 13, and the damper 15 are attached to the weight 16. Are attached to the weight 16 in an arrangement aligned in the vibration direction. In particular, the damper 15 is attached to both the weight 13 and the weight 16 via the spherical bearing 19.

Unlike the rolling bearing, the spherical bearing 19 has no rolling elements, and as shown in FIG. 5, the outer ring 19a and the inner ring 19b are spherical contacts, that is, the sliding contact surface is a spherical bearing. In the spherical bearing 19 on the weight 13 side, the inner ring 19b supports the tip of the connecting rod 19c extending from the damper 15 (see FIG. 2(a)). Similarly, in the spherical bearing 9 on the weight 6 side, the inner ring The tip of the sliding shaft 15a of the damper 5 is supported by 9b. By applying the spherical bearing 19 in this way, when the vibration direction of the weight 16 is deviated from the expansion/contraction direction of the sliding shaft 15a, for example, in the case of the connecting rod 19c in FIG. As illustrated, the shift angle can be absorbed by tilting of the inner ring 19b of the spherical bearing 19.

As shown in FIG. 5, the spherical bearing 19 is fixed to the weight 13 with a bolt 25a via a flange-shaped mounting base 25 that holds the outer ring 19a.

Here, if the ratio m/M between the mass m of the weight 13 of the vibration reduction device 11 and the mass M of the weight 16 that is the vibration suppression object 12 is μ, the fixed point theory that is the optimum design method of the dynamic vibration absorber Based on the above, by setting the mass m, the constant k of the spring 14 and the damping coefficient c of the damper 15 which are parameters as the dynamic vibration reducer 11a of the vibration reduction device 11 as follows, the principle of the dynamic vibration reducer 11a is The vibration amplitude of the vibration suppression target 12 can be made as small as possible.

Note m=μM (1)
k=mK{(1/(1+μ)} ² /M (2)
c=2m {3μK/8M(1+μ) ³ } ^1/2 ...(3)

In the vibration reduction device 11, the above parameters are adjusted by the mass of the weight 13, the spring constant of the spring 14, and the damping coefficient of the damper 15. Then, in a state where the vibration reduction device 11 is attached to the vibration suppression target 12, it is important that each parameter functions as designed. An oil damper that is generally used as a damping element of a dynamic vibration absorber has a sliding portion for enclosing a viscous fluid, and therefore there is a deviation between the vibration direction to be damped by the damper and the expansion and contraction direction of the damper. As described above, if it occurs, the situation of friction in the sliding portion changes, and the damping coefficient and the vibration characteristic change, which poses a problem. In this regard, in the third embodiment, as described above, since the connecting portion of the damper 15 is supported by the spherical bearing 19, a deviation occurs between the vibration direction of the vibration suppression target 12 and the expansion/contraction direction of the damper 15. Even in this case, the spherical bearing 19 can absorb this deviation and smoothly convert the motion in the vibration direction into the motion in the damper expansion/contraction direction, and the damping characteristics as designed can be exhibited.

With the above operation, in the vibration reduction device 11, the parameters of the dynamic vibration reducer 11a function as set without being affected by the installation environment of the device, and the vibration of the vibration suppression target 12 can be minimized.

Next, FIG. 6 shows a schematic diagram of a plate thickness gauge measuring apparatus 1C according to a third embodiment of the present invention. Note that FIG. 6 shows a state in which the sheet thickness is continuously measured by the sheet thickness gauge measuring device 1C in the hot rolling line for the steel sheet 23.

As shown in FIG. 6, the plate thickness gauge measuring device 1C according to the third embodiment is similar to the plate thickness measuring device 1A according to the first embodiment and the plate thickness measuring device 1B according to the second embodiment on the bed plate 2. Alternatively, a plurality of pedestals 3 are mounted on a concrete foundation 6, beams 4 are installed between the pedestals 3 and 3 so as to be parallel to the rolling direction, and a gamma ray plate thickness gauge 5 is provided on the beams 4. There is. Further, a vibration reducing device 11 (dynamic vibration absorber 11a) is installed on the beam 4.

Then, in the process of rolling the steel sheet 23 in the direction shown by the arrow in FIG. 6, the sheet thickness is continuously measured by the sheet thickness gauge measuring device 1C and used for quality control or control of manufacturing conditions.

Here, when a shocking vibration is generated in the bed plate 2 or the concrete foundation 6, the resonance of the platform 3 causes the thickness gauge measuring device 1C to vibrate in the rolling direction of the steel plate 23 with the lower side of the platform 3 as a fulcrum. By installing the vibration reducing device 11 (dynamic vibration absorber 11a) as shown in FIG. 4, this vibration can be reduced.

That is, the weight 13 is installed by the linear slider 20 so as to be freely movable in the same direction as the vibrating direction of the thickness gauge measuring device 1C, and the spring 14 and both ends thereof respectively mount the pedestal 3 and the weight via the spherical bearing 19. The weight 13 is supported by a damper 15 attached to the weight 13. With the above configuration, even if the vibration direction of the gantry 3 and the expansion/contraction direction of the damper 15 are deviated as described above, the vibration reduction effect of the dynamic vibration reducer 11a can be obtained as designed, and the plate The vibration (eg, amplitude, vibration acceleration) of the thickness gauge measuring device 1C can be made as small as possible. As a result, it becomes possible to measure the plate thickness with higher accuracy.

In the third embodiment, the dynamic vibration reducer 11a is installed on the beam 4 as the vibration reducing device. However, as the vibration reducing device, a spring and a damper are provided between the beam 4 and the γ-ray plate thickness gauge 5. It is also possible to install a vibration eliminator composed of and to support the γ-ray plate thickness gauge 5 with the vibration eliminator. Further, both the dynamic vibration reducer and the vibration isolator may be installed.

Although the present invention has been described above based on the embodiments (Embodiments 1 to 3), the present invention is not limited to the description and drawings which are part of the disclosure of the present invention in the implementation of the present invention. There is no such thing.

In order to confirm the effect of the present invention, the plate thickness of the steel plate was continuously measured in a thick plate rolling line.

At that time, the case where the plate thickness gauge measuring device 1A according to the first embodiment of the present invention shown in FIG. 1 is used is a first example of the present invention, and the plate thickness gauge according to the second embodiment of the present invention shown in FIG. The case where the measuring device 1B was used was designated as Example 2 of the present invention. On the other hand, the case where the conventional thickness gauge measuring device 91 shown in FIG.

For each example (present invention example 1, present invention example 2, conventional example), an accelerometer is installed on the beam 4 or the beam 94 to continuously measure acceleration data, and the maximum value of the vibration acceleration and the vibration acceleration are measured. Was calculated. When comparing the maximum value of the vibration acceleration and the average value of the vibration acceleration, the values of Examples 1 and 2 of the present invention were normalized with the values of the conventional example and compared. FIG. 7 shows the comparison result of the maximum value of the vibration acceleration, and FIG. 8 shows the comparison result of the average value of the vibration acceleration.

As shown in FIG. 7, in Example 1 of the present invention, the maximum value of vibration acceleration could be reduced by 60% as compared with the conventional example. Further, it can be seen that in Example 2 of the present invention, the maximum value of vibration acceleration can be reduced by 70% as compared with the conventional example, and the device structure is further resistant to impact vibration during rolling, and the effect of vibration reduction is great.

Further, as shown in FIG. 8, in Example 1 of the present invention, the average value of the vibration acceleration could be reduced by 61% as compared with the conventional example. Further, in the second example of the present invention, the average value of the vibration acceleration could be reduced by 72% as compared with the conventional example.

This confirmed the effectiveness of the present invention.

1A Plate Thickness Measuring Device 1B Plate Thickness Measuring Device 1C Plate Thickness Measuring Device 2 Bed Plate 3 Frame 4 Beam 5 Gamma Ray Plate Thickness Meter 6 Concrete Foundation 11 Vibration Reduction Device 11a Dynamic Vibration Absorber 12 Damping Target 13 Weight (Mass Body) )
14 Spring 15 Damper 15a Sliding shaft 16 Weight 17 Spring 18 Damper 19 Spherical bearing 19a Spherical bearing outer ring 19b Spherical bearing inner ring 19c Connecting shaft 20 Linear slider 23 Steel plate 25 Mounting base 25a Bolt 91 Plate thickness measuring device 92 Bed plate 93 Frame 94 Beam 95 Gamma-ray plate thickness gauge

Claims (4)

It is a plate thickness measuring device installed on the steel plate rolling line,
A γ-ray plate thickness meter that measures the plate thickness of the steel plate during rolling,
A beam on which the gamma ray plate thickness gauge is installed,
A plurality of mounts for supporting the beam,
Bei to give a,
The plate thickness measuring device , wherein the beam is installed between the gantry and the gantry so as to be parallel to a rolling direction . The plate thickness measuring device according to claim 1, wherein the gantry is installed on a concrete foundation insulated from the rolling mill. The beam has, as a vibration reducing device, a dynamic vibration absorber including a mass body to be added to a vibration damping target object, and a spring and a damper interposed between the mass body and the vibration damping target object, The plate thickness measuring device according to claim 1 or 2, wherein the damper is attached to each of the mass body and the vibration damping target via a spherical bearing. As a vibration reduction device, a vibration eliminator composed of a spring and a damper is provided between the gamma ray plate thickness gauge and the beam, and the γ ray plate thickness gauge is supported by the vibration isolator. The plate thickness measuring device according to any one of claims 1 to 3, which is characterized.

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