JPH04104208U - Tension detection roll for strip material - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to obtain a tension detection roll that can detect the tension of a belt-like object during conveyance with a simple structure and with good accuracy. [Structure] A fixed roll shaft is passed through a hollow roll,
A belt-like tension detection roll comprising a roll shaft fulcrum, a roll bearing provided on the roll shaft, and a bending strain detector mounted on the roll shaft, arranged symmetrically with respect to the axial center. [Effect] Since multiple strain detectors (strain gauges) are built into the roll, the roll shaft support part is compact and does not require a detector mounting structure or correction function, and can prevent deviations in the sheet threading position. It is possible to reduce the decrease in detection accuracy due to

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is based on metal, paper, resin, etc. strips and striatums (hereinafter referred to as strips and striates). It relates to a roll for detecting the tension of a board (referred to as a "board") while it is being transported.

0002

[Conventional technology]

As shown in Japanese Patent Application Laid-Open No. 1-205815, as a means for detecting the tension of a belt-shaped body, A reaction force detection device 13 such as a load cell is provided at the support portion of the roll shaft 12 of the roll 11, There is a method of detecting the pressing force applied to the support part by the tension of the plate 14, as shown in FIG. 5(c). , (d), and (e) show how to attach the reaction force detection device 13.

0003

[Problem that the idea aims to solve]

When detecting plate tension, a detection device like the one described above is attached to the roll support. In the mounting method, it is necessary to connect the roll support part and the detection device, and the Parts require high processing precision to achieve balance, or a correction function is added. The mechanism becomes complicated. In addition, in the method shown in Fig. 5(d)(e), the plate meanders. As the sheet passing position shifts from the center of the left and right sides of the roll, the value of the reaction force to be detected will decrease. This has the disadvantage that measurement accuracy deteriorates. The present invention provides a belt that does not have such drawbacks. The present invention provides a tension detection roll in the form of a shape.

0004

[Means to solve the problem]

The present invention is a tension detection roll that detects the tension of a belt-shaped object such as a thin plate during conveyance. Inside the hollow roll, the roll shaft is fixed in position and rotatable in the axial direction via a bearing. The roll shaft is fixedly supported by the roll shaft support part, and the roll shaft is inserted into the hollow roll. A strain detector is arranged symmetrically with respect to the axial center of the roll shaft. This is a tension detection roll for a belt-like material with a simple structure, and the plate meanderes to detect its passing position. Even if there is a slight deviation in the measurement accuracy, it will not lead to a decrease in measurement accuracy and the measurement accuracy will be stable. can be ensured.

[0005] The present invention will be explained in detail below. The tension detection roll of the band-like body of the present invention makes contact with the plate at an arbitrary wrapping angle. A roll, a roll shaft that rotatably supports the roll by a bearing, and the roll shaft. The fixed support part is attached symmetrically to the center of the roll axis to detect tension. It consists of multiple distortion detectors. Note that the strain on the roll axis due to tension is detected by the strain detector. The roll axis dimensions at the strain detection position are set so that they fall within the measurement range. Also , the strain detector power supply cable and signal extraction cable are installed on the roll axis. The resulting tension is connected to a control unit outside the roll through a girder through hole The value is displayed by the control unit.

[0006] Next, the principle of measurement using the tension detection roll of the present invention will be explained below according to the drawings. state As shown in FIG. 1(b), if the tension applied to the plate 6 is T, then the roll 1 The applied pressing force P is calculated using the wrapping angle θ, P=2×T×cos (θ/2) (1) As shown in Fig. 2, the pressing force P is applied to the two supporting points of the roll 1 at P1, When distributed as P2, the distance between the fulcrum of roll 1 and the support point of roll shaft 2 a1, a2, the distance between the strain detection position and the support point of roll shaft 2 is s1, s2, roll shaft 2 When the distance between the supporting points of is l, the bending moment of the beam at the strain detection position M1, The relationship between M2 and P1, P2 is P=P1 +P2 (2-1) M1 =a1 ×P1 ×(l-s1)/l+a2 ×P2 ×s1/l (2-2) M2 = a1 ×P1 ×s2 /l+a2 ×P2 ×(l-s2)/l (2-3) becomes.

[0007] Here, if we calculate P1 and P2 by setting a1 = a2 = a, s1 = s2 = s, then P1 = {M1 × (l-s)-M2 ×s}/{a × (l-2s)} (3-1) P2 = {M2 × (l-s) - M1 ×s}/{a × (l-2s)} (3-2) Here, the Young's modulus of the roll shaft material is E, and the section modulus of the shaft at the strain detection point is Z. Let the strains ε1 and ε2 be, M1 = ε1 ×Z×E (4-1) M2 = ε2 ×Z×E (4-2) From the relationship, by detecting ε1 and ε2, it can be calculated from the roll shaft material and shape. Find M1 and M2 from equations (4-1) and (4-2) using the full values E and Z. I can do it.

[0008] Furthermore, P1 and P2 are found using equations (3-1) and (3-2), P=P1 +P2 = (M1 +M2)/a (5) Therefore, the tension T can be determined using equations (5) and (1). Ma Also, from equation (5), when the plate 6 meanders, in what ratio are the pressing forces P1 and P2 distributed? Even if ε1 and ε2 are measured, the sum of pressing forces can be calculated correctly from the sum of moments. By calculating the sum of these values, the tension T can be accurately determined regardless of the threading position. I can do it.

[0009]

【Example】

FIG. 1(a) shows an embodiment of the present invention, in which a roll shaft 2 is supported with both ends 4a and 4b as fulcrums. It is fixedly supported, and rolling bearings 3a and 3b are provided at positions equidistant from it. It supports the hollow roll 1. Furthermore, a roll shaft 2 inside this hollow roll 1 are equipped with strain gauges 5a, 5b, and 5b as strain detectors at symmetrical positions with respect to their axial centers. 5c and 5d are attached, and by building a bridge circuit with them as shown in Figure 3. The bending strain is determined, and the pressing force and plate tension can be calculated using the above-mentioned formula. Sara Since the roll shaft 2 can be machined as an integral part, it is possible to machine the roll shaft 2 as an integral part. Compared to the previous model, it is more compact and has better machining accuracy for tension detection. B A total of four strain gauges 5a to 5d, two on the upper and lower sides, are used on one side of the strain measurement position of the roll shaft 2. By configuring a bridge circuit using With just one electric amplifier, the output is four times the value measured by a single gauge, regardless of the strip passing position. You can get it right without having to worry about it. Note that even if s=l/2 (distortion detected at the center), (5 ) formula is established, and in this case, the strain gauge can be pasted in one place. Signal processing is a two-gauge method.

0010 FIG. 4 shows the results of tension measurement using the tension detection roll of the present invention. Lo at the strain measurement point When a load is applied to a tension detection roll with a roll shaft diameter of 7 mm and a roll diameter of 35 mm, the load changes. On the other hand, the measured values obtained change linearly, and according to the principle already mentioned, It also agrees well with the calculated values. Furthermore, the load position was shifted by 30 mm from the center of threading. Even when measured, the detected tension value matches the measured value when the plate is at the center of threading. It was confirmed that there was no effect of meandering of the board. In addition, a strain gauge is installed inside the roll. By incorporating a built-in roll shaft support part, a complicated structure for attaching a detector etc. is required. Realizes a compact tension detection roll that does not require construction, processing precision, or correction functions. did it.

[0011]

[Effect of the idea]

This invention has a built-in strain detector such as a strain gauge inside the roll to support the roll shaft. It does not require a complicated structure to attach a detector etc. to the holding part, and it also helps ensure measurement accuracy. It is compact, inexpensive, and has a simple structure that does not require high precision machining. , measurement accuracy can be stably ensured even if the plate meanders.

[Brief explanation of drawings]

FIG. 1 (a) is a schematic diagram of a tension measuring roll according to the present invention, and (b) is a side view of (a).

FIG. 2 is a schematic diagram showing the relationship between the load applied to the roll shaft and the moment generated in the present invention.

FIG. 3 is a configuration diagram of a measurement circuit in the present invention.

FIG. 4: Measurement results of load and detected strain using the roll of the present invention.

FIG. 5 is an explanatory diagram of the prior art, (a) is a schematic diagram thereof, (b) is a side view of (a), (c), (d), (e)
is a diagram showing the installation method of the detection device.

[Explanation of symbols]

1 hollow roll 2 Roll axis 3a, 3b bearing 4a, 4b Roll shaft support part 5a, 5d Strain gauge (strain detector) 6 board 7 Control unit 11 rolls 12 Roll axis 13 Reaction force detection device 14 board

Claims (1)

[Scope of utility model registration request] Claim 1: In a tension detection roll for detecting the tension of a belt-like object such as a thin plate being conveyed, a roll shaft is fitted into a hollow roll through a bearing so as to be rotatable in a fixed position in the axial direction, and 1. A tension detection roll for a band-shaped body, characterized in that the shaft is fixedly supported by a roll shaft support part, and a strain detector is arranged on the roll shaft in a hollow roll symmetrically with respect to the axial center of the roll shaft.