JPS61192653A - Expansion and/or contraction control method of spiral looper - Google Patents

Abstract

PURPOSE:To enable the roller position to be controlled smoothly and accurately without any slipping in expanding and/or contracting by restricting the maximum value of a drive force so as to correct an error in calculation when the value for the expansion and/or contraction position of a support roller is erroneously calculated. CONSTITUTION:Pressure control valves 42 and 45 which are capable of setting the pressure as required by means of hydraulic pressure controller 47 and 48, set the upper limit F0 of a drive force for an expansion/contraction cylinder on a keyboard. If the pressure F detected by pressure detectors 65 and 66 is found to be greater than F0, the controller 47 and 48 are activated allowing the pressure F to be controlled so as not to exceed F0. Thus, the upper limit of the drive force is restricted, accordingly, this does not permit the actual displacement of support roller to be a value close to the calculated one. Therefore, the control deviation in an ordinary position control can not be zero, however, this deviation is produced accompanied with an error in detection indicating the deviation between the calculated value and the true position of the radius. Therefore, when the machine is controlled so as to prevent damages, the correction is made in such a manner that the deviation between the calculated value for the radius position of the support roller and the actually measured value, becomes zero.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a spiral louver that accumulates a large amount of belt-like material, and in particular, to a spiral louver that can smoothly expand and contract the position of its support roller. Regarding the control method.

[Background of the invention]

Conventionally, the slip between the strips of a horizontal shaft type spiral louver was kept to a very small value, and the surface quality was not compromised.
In addition, a method of controlling expansion and contraction of support rollers that enables smooth operation is known (US Pat. No. 42,880).
No. 2). In this known example, the support rollers are not actively expanded or contracted. An example of actively expanding and contracting the support roller is Japanese Patent Application No. 18800/1983. In addition, an example in which this support roller expansion/contraction mechanism is taken out from the drum shaft is disclosed in Japanese Patent Application No. 58-1651.
There is Publication No. 79.

However, these techniques for expanding and contracting support rollers often cause problems such as slippage occurring on the IJ tab and surface scratches on the strip.

As a means to solve this problem, as an example of calculating and controlling the expansion/contraction position of the support roller, Japanese Patent Application No. 59-160013
There is a publication. In 9+1, the support roller position is theoretically calculated and controlled from the feeding length and feeding length of the strip-like material, and the rotation angle of the drum.

However, in this control method, some errors occur in the support roller calculation values due to variations in plate thickness, detection errors, calculation errors, etc. In particular, when the calculated value is larger than the true (good) support roller radial position, a large load is applied to the support roller, making it difficult to operate the spiral louver smoothly.

[Object of the Invention] An object of the present invention is to provide a support roller expansion/contraction position control method ε in a spiral rooting machine that can control expansion/contraction of the support roller position with high accuracy and smoothly without causing slippage in the strip. There is a particular thing.

[Summary of the invention]

The present invention focuses on the fact that when an error occurs in the calculated value when controlling the expansion/contraction position of the support roller, the driving force of the support roller expansion/contraction drive device increases or decreases, and limits the maximum value of this driving force. By doing so, calculation errors are corrected and smooth expansion/contraction control of the support roller is performed.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic structure of a spiral louver which is an embodiment of the present invention.

In the figure, the strip 1 is fed through the input pinch roller 2 to the input side of the looping device where it is fed into the input coil 3.
form. A large number of support rollers 4 are arranged in an annular manner along the inside of the inlet coil 3, and the coil is held by these rollers. The strip leaving the inlet coil 3 exits the helicaltor 15, which is a strip drawing device, and moves to the outlet coil 6, where it is formed into a coil and stored.

A support roller 7 is also arranged inside this output coil 6. The strip that has passed through the output coil 6 is sent out to the outside of the looping device via an output pinch roller 8.

Here, the support rollers 4 and 7 have a structure that prevents the strip from slipping between layers and can expand and contract in the radial direction. An example of the expansion and contraction device is shown in FIG. Here, FIG. 2 only shows the input side, or the output side has exactly the same structure.

The support roller 4 is a large gear 1 slidably attached to the face plate 15 of the drum shaft 9 via a rack 11 and a pinion 12.
It is supported by 3. Support roller 4 is rack 1
1 is attached to the friend rod. Binion 12
The shaft of the large gear 13 is attached to the face plate 15, and the outer periphery of the large gear 13 meshes with the gear 24, and the inner periphery meshes with the pinion 12. Therefore, as the large gear 13 rotates relative to the face plate 15, the support row 24 expands and contracts in the radial direction of the drum shaft.

This expansion/contraction of the support roller is performed by an expansion/contraction cylinder 28 via reduction gears 17 to 19 and planetary gears 21.

Next, an example of an expansion/contraction drive device is shown in FIG. In this figure, the expansion/contraction cylinder 28 is connected to a hydraulic power source P via a switching valve 41 and a pressure valve 42. In addition, the switching valve 41 is connected to the tank T, the pressure regulating valve 44, and the flow! It is brought into contact via the regulating valve 43, and a certain amount of flow t1 is always flowing in a bypass manner.

Since the moving position of the support roller 4 is proportional to the stroke of the expansion/contraction cylinder 28, the expansion/contraction control only needs to control the position of the expansion/contraction cylinder 28.

Next, the control method will be explained. Figure 4 shows the expansion/reduction control system in Figure 3. S) The IJ knob feeding length At is determined by the rotation detector 61 attached to the input side pinch roller 2 shown in FIG. In addition, the drum shaft 9
The rotation angle θVs is obtained by detecting the rotation angle θVs with the detector 63 shown in FIG. Computer (CP(J) 49 is the support roller 4 based on the following formula obtained from the geometrical relationship.
and the radial position Rt 21 Ro 2 of 7 is calculated.

Here, Rzo: Initial value of the radial position of the inlet side support roller Do: Initial value of the radial position of the outlet side support roller h: Plate thickness, CPU Compare and calculate the deviation.

The hydraulic controller 48 sends a control signal commensurate with this amount of deviation.
and controls the flow rate of the flow rate adjustment valve 45. In the hydraulic circuit shown in No. 319, the bypass circuit always moves from the P side to the T side.
Since oil is supplied to the side, even when the expansion/contraction cylinder 280 overstrokes, the expansion/contraction cylinder 28 can be moved in either direction by restricting the flow rate of the flow rate adjustment valve 45. It should be noted that the data necessary for calculating equation (1) can be input using the keyboard 50.

The above control method shows the control system at section A in FIG. 4, and normal position control is performed by this 'h method. However, the calculated values of equation (1), h, t, and Lo, are input values and detected values, and include some errors. If this calculated value is smaller than the true value due to an error, the driving force required to expand and contract the support roller will increase, making it impossible to operate the spiral louver smoothly and possibly damaging the machine. In the present invention, as a countermeasure against such a problem, the control method shown in section B in FIG. 4 is carried out simultaneously with section A, and will be explained below.

The pressure control valves 42 and 45 in FIG.
7 and 48, the pressure can be set arbitrarily, and the upper limit of the driving force of the expansion/contraction cylinder can be set using the Fo'Th keyboard. The value of Fo is set to about 1.5 to 2 times the driving force when normal expansion/contraction control is performed.

The support roller driving force F is detected by pressure detectors 65 and 66 attached to the head side and the rond side of the expansion/contraction cylinder 28.

The CPU 49 compares the actual measurement value F of the driving force with the upper limit value Fo. If F is smaller than Fo, no scaling control is performed in part B of the fourth factor. When F becomes smaller than Fo, the hydraulic controllers 47 and 48 operate to control F to a value that does not exceed Fo. If the upper limit of the driving force F is limited, the actual displacement of the support roller cannot approach the calculated value, and the control deviation in section A of FIG. 4 cannot become zero. However, this deviation is due to a detection error and indicates the deviation between the calculated value and the true radial position. Therefore, when the control of section B is performed, the CPU may correct the calculated value of the radial position of the support roller so that the deviation from the actually measured value becomes zero. In the figure, 22 is a gear, 23 is a rotating shaft, 25 is a rotating shaft, 26 is a gear, 27 is a gear, 31 is a gear box, 32 is a sliding motor, 46 is a hydraulic controller, and 64 is a detector.

〔Effect of the invention〕

According to the present invention, the expansion and contraction of the support roller of the spiral louver can be computationally controlled with a high degree of efficiency without causing slippage in the strip, and it is also possible to correct errors in the calculated values due to detection errors.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a spiral louver according to an embodiment of the present invention, FIG. 2 is a schematic diagram of a support roller expansion/contraction device for a spiral louver of the present invention, and FIG. 3 is a schematic diagram of a control circuit for a support roller expansion/contraction device of the present invention. FIG. 4 is a schematic diagram of a support roller expansion/contraction control method according to an embodiment of the present invention. 1... Band-shaped object (strip), 3... Inlet coil,
4... Inlet side support roller, 6... Outlet side coil, 7
...Exit side support roller, 28...Expansion/contraction series/re
, 46-48... Hydraulic controller, 49... Arithmetic device, 61. ,,／””',.

Claims (1)

[Claims] 1. A first device and a second device for forming a first coil and a second coil, respectively, while winding a moving strip; and a strip from the first coil to the second coil. The coil is configured to be movable by a drive device having a structure that allows the upper limit of the driving force to be arbitrarily set for the radius of the support roller that supports each coil, and that allows for positioning control. In the spiral louver support roller expansion/contraction position control device, the radial position of the support roller is calculated based on detection values from a detection device that detects the feeding length and feeding length of the strip and the rotation angle of the drum. , the deviation between this calculated value and the measured value of the radial position of the support roller is calculated, and the drive device of the support roller is controlled so that the deviation value becomes zero, and the driving force of the drive device is A method for controlling expansion and contraction of a spiral louver, characterized in that a calculated value is corrected so as to reset the positional deviation of the support roller to zero when it matches an externally set upper limit value.