JPH05331556A - Instrument for detecting tension of metal strip - Google Patents

Abstract

PURPOSE:To provide an inexpensive detecting instrument for tension of a metal strip, in which the installation space is made small and the structure is simplified. CONSTITUTION:In this instrument, guides 2 arranged at each fixed supporting part in both sides of the metal strip passing through part, bearing supporting bodies 3 arranged at each guide 2 so as to be vertically slidable, bearings 4 arranged to each bearing holding body 3, a holding roll 5 supported with both bearings 4 and weigher 6 supporting each bearing supporting body 3 at this lower part are provided. By this weigher 6, a load of difference between the load of the holding roll, etc., and push-up force loaded to the holding roll 5 by the tension of the metal strip is detected so as to measure the tension of the metal strip from this detected value and the known wt. of the holding roll, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension detecting device for a traveling metal strip, and more particularly to a device suitable for detecting the tension of a traveling metal strip with low tension.

[0002]

2. Description of the Related Art In continuous heat treatment lines for steel strips, it is important to control the tension of the traveling steel strips in order to ensure stable line operation and material quality. A device for measuring is used.

As this tension detecting device, a lever type device as shown in FIG. 7 is conventionally known. This device includes a lever 24 rotatably supported by a fulcrum 25, a presser roll 22 suspended from one end of the lever 24 via an arm 23, and a counterweight 27 attached to the other end of the lever 24. A load cell 26 for detecting the pressing force of the lever 24 is provided, and the pressing roll 22 is arranged so as to contact the upper surface of the steel strip S between the rolls 28a and 28b of the processing line on which the steel strip S runs. , The lever 24 according to the tension of the steel strip S applied to the presser roll 22
The pressing force of is detected by the load cell 26, and the steel strip tension is measured based on the detected amount.

[0004]

However, since such a conventional device requires a large space for the lever 24 and the like above the presser roll 22, it should be applied to an actual machine line from the viewpoint of securing the space. Can be difficult,
Further, since high manufacturing accuracy is required, there is a drawback that the equipment cost is high. In view of such conventional problems, the present invention aims to provide a tension detecting device which requires a small installation space, has a simple structure, and is inexpensive.

[0005]

SUMMARY OF THE INVENTION The present invention for solving the above problems is provided with guides provided on fixed support portions on both sides of a metal strip passing plate portion, and vertically slidably provided on the guides. A tension detecting device for a metal band, comprising a bearing holder, bearings provided on the bearing holders, a press roll supported by the bearings, and a weighing device that supports the bearing holders below. is there. In such a device, the guide can be formed by a guide rail, and the sliding portion of the bearing holder that is in contact with the guide rail can be formed by a bearing.

[0006]

The apparatus of the present invention is arranged so that, for example, between the arbitrary rolls of the processing line along which the metal strip travels, the pressing roll can contact the upper surface of the traveling metal strip. The pressing roll that is in contact with the metal band rotates as the metal band travels, and a lifting force based on the metal band tension acts on the pressing roll. Since the bearing holder is vertically slidable along the guide, the load of the bearing holder, the bearing, the press roll, and the like can be received by the measuring instrument via the bearing holder.
The measuring device detects a load which is a difference between a load of a member supported by the measuring device (a pressing roll, a bearing, a bearing holder, etc.) and a lifting force applied to the pressing roll by the tension of the metal band. Therefore, it is possible to measure the tension of the metal band from the detected value and the weight of the member (the pressing roll, the bearing, the bearing holder, etc.) which is known in advance.

Further, in the apparatus in which the guide is constituted by the guide rail and the sliding portion of the bearing holder which is in contact with the guide rail is constituted by the bearing, the bearing holder slides on the guide rail via the bearing. Therefore, the frictional resistance with the guide rail is small, and therefore, the position of the sliding portion on the guide rail can be accurately maintained according to the tension of the metal strip.

[0008]

1 to 4 show an embodiment of the tension detecting device of the present invention, in which 1 is a gate-type frame which is laid across a metal strip passing plate portion, and this frame supports the device. To do. The device is
Guide rails 2 provided on both sides of the frame 1 so as to face each other in the vertical direction, bearing holders 3 provided on the guide rails 2 so as to be vertically slidable, and bearing holders 3
A bearing roll 4 supported by both bearings 4, and a weighing device 6 that supports each bearing support 3 below it.

Each bearing holder 3 has a sliding member 8 attached to the guide rail 2. 3 and 4 show the sliding member 8 and its mounting structure. In order to minimize the frictional resistance of the sliding member 8 to the guide rail 2, the sliding member 8 is provided with a guide rail via a bearing. 2 is configured to slide on.

The sliding member 8 has a vertical groove 9 for receiving the guide rail 2 having a rectangular cross section.
A part of the guide rail 2 is located inside. Inside the groove 9, there are provided four sets of bearings 10 in contact with both side surfaces of the guide rail 2 and both corners in the respective longitudinal directions. The sliding member 8 is provided with an annular guide passage 11 that accommodates each bearing 10 and circulates the bearing 10 inside the groove 9. Each annular guide passage 11 is composed of a guide groove portion 11a provided in the vertical direction on the inner surface of the concave groove 9 and a guide hole portion 11b formed inside the sliding member 8, and the bearing 10 serves as the guide passage 11. Are continuously arranged all around.

Grooves 12 having an arcuate cross section are formed on both side surfaces of the guide rail 2 and at both corners of the guide rail 2 in the respective longitudinal directions, and four pairs of bearings 10 are fitted into the grooves 12. By doing so, the sliding member 8 is slidably held by the guide rail 2.

In such a bearing mechanism, as the sliding member 8 moves along the guide rail 2, the bearing 10 in contact with the guide rail 2 rotates and the guide groove portion 1 moves.
As a result, the entire bearing moves in a circular manner in the guide passage 11. By using the mechanism in which the bearing circulates with the movement of the sliding member, the frictional resistance when the sliding member moves can be effectively reduced.

The measuring instrument 6 is held by supporting portions 7 (brackets) provided on both sides of the frame 1, and is below the bearing supporting body 3 to support it. That is, the bearing support 3 is placed on the weighing section of the weighing device 6, and the bearing support 3 and the pressing roll 5 are moved by the weighing device 6.
The load such as is measured. The pressing roll 5 is rotatably supported by a bearing 4. This presser roll 5
In order to reduce the weight and improve the detection accuracy, it is preferable to use a non-metallic material such as vinyl chloride.

FIG. 5 shows a state in which the apparatus a of the present invention as described above is arranged between the rolls 15a and 15b on the inlet side of the continuous processing furnace A, 13 is a tension meter, 14 is a tension controller, and R is a controller. Is a speed control roll. One of the speed control rolls R is a drive roll.

According to the apparatus of the present invention as described above, since the bearing holder 3 is vertically slidable along the guide rail 2, the load of the bearing holder 3, the bearing 4 and the press roll 5 is It is received by the weighing device 6 via the bearing holder 3, and therefore the weighing device 6 is pressed by the load of the pressing roll 5, the bearing 4 and the bearing holding member 3 and the tension of the metal strip S.
The load of the difference with the pushing force applied to is detected.

Further, particularly in this embodiment, since the sliding member 8 of the bearing holder 3 slides on the guide rail 2 via the bearing 10 which circulates in the guide passage 11 inside thereof, the sliding member 8 The frictional resistance between the guide rail 2 and the guide rail 2 is extremely small. Therefore, the position of the sliding member 8 on the guide rail is accurately maintained according to the magnitude of the pushing force acting on the presser roll 5 by the tension of the metal band. It is possible to detect tension with high accuracy. The measured value by the measuring device 6 is output to the tension meter 13 in FIG. 5, and the tension of the metal band S is obtained based on the weight of the members (press roll, bearing, bearing holder, etc.) given in advance, and this tension The value is given to the tension control device 14, the speed control roll R is controlled, and the tension control is performed.

FIG. 6 shows an embodiment in which the apparatus of the present invention is applied to a Si diffusion and infiltration treatment line for steel strips.
6 is a heating zone, 17 is a CVD treatment zone, 18 is a soaking zone, 19
Is a cooling zone, 20 is a roll in the furnace, and the device a of the present invention is arranged between the rolls 21a and 21b on the furnace entrance side. In addition,
In such a heat treatment furnace, the device a of the present invention can be provided on the exit side of the furnace.

Incidentally, the sliding mechanism of the sliding member by the bearing is not limited to the above-mentioned embodiment. For example, the guide rail is provided with a concave groove along the longitudinal direction, and the sliding member is provided in the concave groove. It is possible to adopt an appropriate structure, such as by locating at the position, and sliding in the groove through the bearing as in the above embodiment.

[0019]

As described above, according to the present invention, since there is no structural member above the pressing roll, the installation space is small, and the structure is simple and large manufacturing accuracy is not required. is there.

Further, in particular, in a device in which the guide is constituted by a guide rail, and the sliding portion of the bearing holder which contacts the guide rail is constituted by a bearing, the bearing holder slides on the guide rail via the bearing. Therefore, the frictional resistance with the guide rail is small, and the position of the sliding portion on the guide rail is accurately maintained according to the tension of the metal strip, so that the tension of the metal strip can be detected with high accuracy. ..

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the device of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a partially cutaway plan view showing a sliding member and its mounting structure constituting the device shown in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an explanatory view showing an embodiment in which the apparatus of the present invention is applied to the inlet side of the continuous processing furnace A.

FIG. 6 is an explanatory view showing an example in which the device of the present invention is applied to a Si diffusion / infiltration treatment line of a steel strip.

FIG. 7 is an explanatory view showing a conventional tension detecting device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Frame, 2 ... Guide rail, 3 ... Bearing support body, 4 ... Bearing, 5 ... Press roll, 6 ... Measuring device, 8 ... Sliding member, 10
... Bearings, 11 ... Guide passages, 11a ... Guide grooves, 1
1b ... Guide hole, 12 ... Recessed groove

Front page continuation (72) Inventor Kazuhisa Okada 1-2 1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.

Claims (2)

[Claims] 1. A guide provided on each of the fixed supporting portions on both sides of the metal band passing plate portion, a bearing holder provided on each guide so as to be vertically slidable, and a bearing provided on each bearing holder.
A tension detecting device for a metal band, comprising: a pressing roll supported by the bearing; and a weighing device that supports each bearing support member therebelow. 2. The guide is constituted by a guide rail,
The tension detecting device for a metal band according to claim 1, wherein the sliding portion of the bearing holder that is in contact with the guide rail is formed of a bearing.