JPH0339685Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a shape detection device that can detect the tension distribution subdivided in the width direction of the strip in order to determine the shape (flatness) of the strip being tension rolled. It is something.

[Prior Art] When tension rolling a strip, it is not possible to visually assess the flatness of the strip while it is running, so it is necessary to detect the tension distribution in the width direction of the strip to understand the shape of the strip. Therefore, various shape detection devices have been used in the past.

Among conventional shape detection devices, a rotor supported by an air bearing is used to absorb the tension of the strip.
The first example in which the differential pressure between the air pressures above and below the air bearing is detected will be explained with reference to FIGS. 9 and 10. In the figures, 1 is a hollow fixed shaft fixed to a stand (not shown) , 2 are a plurality of rotors that fit around the outer periphery of the fixed shaft 1 and are arranged separately in the axial direction; 3 are arranged on the outer periphery of the fixed shaft 1 at predetermined intervals in the axial and circumferential directions; This nozzle receives compressed air through a guide hole 5 bored in the radial direction from the hollow part 4 and injects the compressed air into the gap between the rotor 2 and the fixed shaft 1.

Detection ports 7, 7 for measuring air pressure are provided between the nozzles 3, 3 located directly below the strip 6, and each detected pressure is led to a differential pressure transducer 9 via detection tubes 8, 8. Here, the differential pressure is subjected to pneumatic conversion, and the converted electric signal is sent to an arithmetic unit (not shown) via the cable 10, and the tension in the strip 6 is calculated using equation 1.

t=W/2bdsin(θ/2) Formula (1) where t: Unit tension (kg/mm ² ) W: Rotor vertical load determined in proportion to the above differential pressure (kg/mm ² ) b: Rotor width ( mm) d: Strip thickness (mm) θ: Bend angle of the plate.

A second example of a conventional shape detection device is shown in FIGS. 11 and 12. In this case, a sleeve 12 is fitted around the outer periphery of the fixed shaft 1a, and a ring-shaped groove 1 provided inside the sleeve 12 supplies compressed air to the nozzle 3a and detects pressure at the detection port 7a.
3, 13, 13, and a pipe 14 is individually connected to each groove 13, 13, 13.

[Problems to be solved by the invention] However, in the shape detection device as described above, compressed air is supplied to keep the rotor 2 floating above the fixed shaft 1, but the width dimension b of the rotor 2
must be set quite large (for example, the rotor diameter
170 mm (width dimension: 75 mm), the rotor 2 tilts due to the tension distributed in the axial direction, and the fixed shaft 1 and rotor 2
The pressure of the air supplied between the strips decreases, and as a result, the rotor 2 cannot be supported, causing a practical problem in the operation of the air bearing. There was a problem that could not be measured.

[Means for solving the problem] The present invention aims to reduce the inclination of the rotor by expanding the static pressure holding portion that supports the rotor in the axial direction, thereby preventing a sudden pressure drop in the supplied air. The present invention aims to provide a shape detecting device for rotors with a small width dimension, in which each rotor has an outer rotor part formed in a cylindrical shape, and an outer rotor integrally fixed to the inner circumference of the outer rotor part. a convex portion having an arcuate cross-section extending in the axial direction from both width ends of the outer rotor portion, and a recess formed so as to retract in the axial direction from both width ends of the outer rotor portion and to be able to fit with the convex portion; and inner rotor parts formed alternately in the circumferential direction and symmetrically in the axial direction.

[Function] Each rotor has a cylindrical outer rotor portion and an inner rotor portion having convex portions and concave portions that engage with adjacent rotors alternately in the circumferential direction and symmetrically in the axial direction. Therefore, a combination of multiple such rotors expands the static pressure holding area in the axial direction, eliminating rotor inclination, and as a result, a sudden pressure drop distributed in the axial direction between the rotor and the fixed shaft is reduced. It is possible to prevent this and reduce the rotor width dimension.

[Embodiment] Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 8. In addition, in the figure, the same reference numerals and symbols are used for parts that perform the same functions as the parts of the shape detection device used when explaining the conventional example, and the description thereof will be omitted.

The rotor 21, which is a feature of the present invention, includes an outer rotor part 22 formed in a cylindrical shape and an inner rotor part 23 integrally formed inside the outer rotor part 22, as shown in FIGS. 1 to 5. It is composed of

The inner rotor part 23 has a convex part 25 having an arcuate cross section extending in the axial direction from both width ends 24, 24 of the outer rotor part 22, and has substantially the same shape and dimensions as the convex part 25, and has the end part It has recesses 26 extending from 24, 24 in the axial direction, and three projections 25 and three recesses 26 are provided on each side alternately in the circumferential direction. As shown in the developed view of FIG. 5, adjacent rotors have one convex portion 25 in the other concave portion 26,
Further, the protrusions 25 of the other are combined so as to fit into the recesses 26 of one, forming a seemingly continuous cylinder (see FIG. 4). In addition, as shown in FIG. 5, two detection ports 7,
7 and 16 nozzles 3 are assigned.

In FIG. 6, 27 is a pedestal that supports the fixed shaft 1, and 28 is an air pipe that supplies compressed air to the hollow portion 4 of the fixed shaft 1. Note that each part other than the above has the same structure as in FIG. 9, and therefore a description thereof will be omitted.

Next, the operation of this device will be explained. Compressed air is injected from the nozzle 3 from the air pipe 28 through the hollow part 4 of the fixed shaft 1 and the guide hole 5, and forms an air bearing in the gap between the fixed shaft 1 and each rotor 21, and the rotor 2
1 is supported by this air bearing and receives the tension F of the strip 6. The air forming the air bearing passes through the fitting portion between adjacent sleeves, that is, the engagement portion 32 with the mutually engaged convex periphery 29 and the concave periphery 30, and then flows into the inner part of the outer rotor portion 22 of the rotor 21. It is released into the atmosphere through the contact portion between the circumferential surface 33 and the outer circumferential surface 34 of the convex portion 25 in the inner rotor portion 23 of the rotor 21 (see FIG. 4).

In this case, the combined rotors act like a single flexible tube, making it difficult for the rotors to tilt. Therefore, a sudden drop in the pressure gradient distributed in the axial direction within the air bearing does not occur, and the supporting load per unit area of the air bearing increases, so the width dimension b per rotor can be reduced ( The tension distribution in the strip width direction can be detected in a more detailed manner (50 mm to 25 mm, compared to the conventional 75 mm width).

FIG. 8 shows an example in which the shape detecting device of the present invention is applied to rolling equipment to enable automatic strip shape control. In the figure, 41 is a winding machine, 42 is an unwinding machine, 43 is a single-stand rolling mill, 44 is a shape detection device according to the present invention, 45 is a roll coolant spray device which is a strip shape correction device, and 46 is a work roll. 47 is a roll bending device, 48 is a back roll using a variable crown roll, 49 is a roll crown changing device for changing the crown of the back roll 48, 50 is a hydraulic rolling device, and shape detection device 44 is a rolling machine. It is placed on the exit side so that it can be raised and lowered.

The tension F of the strip 6 detected by the shape detection device 44 is passed through the cable 10 as an electrical signal,
It is amplified by the amplifier 51 and input to the arithmetic and control device 52, where it is calculated based on the above-mentioned formula (1), and the calculation result is sent to the roll coolant spray device 4.
5. Output as a command signal to the roll bending device 46, roll coolant changing device 49, and hydraulic lowering device 50, and each of these devices 45, 46, 4
9 and 50 are adjusted so as to equalize the tension distribution in the width direction of the strip 6.

It should be noted that the present invention is not limited to the above-described embodiments; for example, the planar shape of the convex portions and concave portions may be formed into a different shape instead of a rectangular shape; Of course, various changes may be made without departing from the gist of the present invention, such as the possibility of providing three or more in the circumferential direction.

[Effects of the Invention] As described above, the shape detection device of the present invention exhibits the following excellent effects.

() Each rotor has a cylindrical outer rotor portion,
Since the inner rotor part is provided with convex parts and concave parts arranged alternately in the circumferential direction, which engage with adjacent rotors, a combination of a plurality of such rotors is like a single continuous rotor. It acts like a cylinder and expands the static pressure holding part of the rotor fitting part in the axial direction, making it difficult for the rotor to tilt and preventing a sudden pressure drop. Therefore, the rotor width dimension can be shortened.

() As a result of item (), the width dimension per rotor can be shortened, and the tension distribution in the strip width direction can be detected in a more finely divided state.

[Brief explanation of drawings]

1 to 8 show embodiments of the present invention,
Figure 1 is a perspective view conceptually showing the shape of the rotor;
Fig. 2 is a cutaway front view of the rotor, Fig. 3 is a view taken from the - direction in Fig. 2, Fig. 4 is a cutaway front view of a plurality of assembled rotors, and Fig. 5 is shown in Fig. 4. 6 is a cutaway front view of the shape detecting device of the present invention, FIG. 7 is a view taken from the − direction in FIG. 6, and FIG. 8 is the shape detecting device shown in FIG. 6. An explanatory diagram of an example of the rolling equipment to which the application is applied. Figures 9 to 12 are explanatory diagrams of a conventional shape detection device. Figure 9 is a partially cutaway perspective view of the first example, and Figure 10 is also a cut side view. 11 is a cutaway side view of the second example, and FIG. 12 is a partially cutaway front view taken from the direction in FIG. 11. In the figure, 1 is a fixed shaft, 6 is a strip, 21 is a rotor, 22 is an outer rotor portion, 23 is an inner rotor portion, 25 is a convex portion, and 26 is a concave portion.

Claims (1)

[Scope of utility model registration request] A plurality of rotors are fitted on the outer periphery of a fixed shaft in the axial direction, and the strip tension acting on each rotor is taken as a pressure change in the fluid bearing formed between the inner periphery of the rotor and the outer periphery of the fixed shaft. In a shape detection device that measures the tension distribution in the width direction of the strip by electrostatically converting the A convex portion having an arcuate cross section extending in the axial direction from both width ends of the outer rotor portion, and retractable in the axial direction from both width ends of the outer rotor portion, respectively, and capable of fitting with the convex portion. 1. A shape detection device comprising an inner rotor portion formed by forming recesses alternately in the circumferential direction and symmetrically in the axial direction.