JPS632860B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an inlet automatic method that calculates the start point of deceleration of the speed of a coiled strip material made of steel plate, paper, rubber, plastic, etc. when unwinding the strip material by an unwinding machine. This invention relates to a deceleration control device. Entry side automatic deceleration control means that when the tail end of the strip material being rewound by the unwinding machine leaves the unwinding machine,
This control is performed to prevent damage to machinery and equipment and damage to the strip material due to swinging of the tail end of the strip material by completing the speed reduction of the strip material.

A conventional device of this type is shown in FIG. In Fig. 1, 1 is an unwinding machine, 2 is a pinch roll, 3 is a coiled steel plate, 4 is a rotation amount measuring device, 5 is a steel plate movement amount measuring device, and 6 is a speed for calculating the unwinding speed of the steel plate. A calculation circuit 7 is a coil diameter calculation circuit that calculates the coil diameter of the coiled steel plate 3 being rewound by the unwinding machine 1; 8 is a winding of the coiled steel plate 3 being rewound by the unwinding machine 1; A coil turns number calculation circuit that counts the amount of return; 9 is a deceleration start turns calculation circuit that calculates the number of turns of the coiled steel plate at the time when the unwinding machine 1 starts decelerating; 10 is a deceleration start turns calculation circuit that calculates the number of turns calculated in this deceleration start turns calculation circuit. This is a deceleration command calculation circuit that outputs a deceleration command when the number of turns matches the number of turns of the coiled steel plate 3 being rewound by the unwinding machine 1.

Next, the operation will be explained using FIGS. 1 and 2.

In FIG. 1, a rotation amount measuring device 4 is attached to the unwinding machine 1 and outputs a pulse corresponding to the rotation of the coiled steel plate 3, for example, one pulse every time the coiled steel plate 3 rotates once. Further, the steel plate movement measuring device 5 attached to the pinch roll 2 outputs a pulse according to the rotation of the pinch roll 2 in order to obtain a signal l proportional to the distance the steel plate has moved.

In the speed calculation circuit 6, the steel plate movement amount measuring device 5
The velocity V of the steel plate 3 is calculated by measuring the pulses for a certain time t. The coil diameter calculation circuit 7 uses the pulse of the steel plate movement amount measuring device 5, that is, the signal l corresponding to the movement amount of the steel plate 3, to calculate the coil shape using equation (1) every time the coiled steel plate 3 rotates once. The coil diameter D of the steel plate 3 is calculated.

D=l/π...Equation (1) The deceleration start turns calculation circuit 9 executes calculations based on the following principle. The amount of movement of the steel plate at the point where the speed of the coiled steel plate starts decelerating and ends when decelerating.
l' is given by l'=1/2 V ² /α...(2) formula.

Here, V is the speed of the steel plate, and α is the deceleration rate of the speed of the steel plate.

Furthermore, if the coil diameter at the start of deceleration is D ₁ , the coil diameter at the end of deceleration is D ₀ , and the thickness of the steel plate 3 is h,
For example, based on the known formula shown in Japanese Patent Publication No. 53-15352, the above movement amount l' is calculated as: l'=D ₁ -D ₀ /2h×πD ₀ +D ₁ -D ₀ /2h×(D ₁ -D ₀ /2h+1)×πh...It is expressed as equation (3).

Therefore, the coil diameter D ₁ at the start of deceleration can be obtained from equation (3).

Now, in Fig. 2, the coil diameters of the coiled steel plate 3 are D ₀ , D ₁ , D ₂ , D ₃ , the number of turns of the coil between D ₃ and D ₂ is N ₂ , and the number of turns between D ₂ and D ₁ is Let the number of turns of the coil be N ₁ .

Furthermore, D ₁ , D ₂ , and D ₃ are determined so that equation (4) holds true.

D ₃ - D ₂ = D ₂ - D ₁ ... Equation (4) Also, assuming that the thickness h of the steel plate is constant, D ₃ - _{D 2} = 2 x h x N ₂ ... Equation (5) D ₂ −D ₁ = 2×h×N ₁ ... From equations (6) (4), (5), and (6), N ₁ = N ₂ ... (7) From equation (7), the coil of steel plate 3 Measure the number of turns N ₂ of the coil whose diameter is between D ₃ and D ₂ , and find out that the coil diameter of steel plate 3 is
When the number of turns N _{2 matches D 2} , the number of turns N ₂ of the coil is sent to the deceleration command calculation circuit 10 shown in FIG.

To specifically describe the operation of the deceleration start winding number calculation circuit 9, based on the speed V of the steel plate 3 inputted from the speed calculation circuit 6 and the preset deceleration rate α, (2)
The amount of movement l' of the steel plate 3 is calculated according to the formula. this
l', calculate D ₁ based on equation (3), and set coil diameters D ₂ and D ₃ that satisfy equation (4). The method for setting the coil diameters D ₂ and D ₃ cannot be uniquely determined because there are various coil diameters of the coiled steel plate 3 to be rewound. Therefore, there is a method of setting appropriate coil diameters D ₂ and D ₃ assuming the minimum coil diameter, or obtaining the coil diameter of the unwound coiled steel plate 3 from the coil diameter calculation circuit 7 and There is a method of appropriately setting D ₂ and D ₃ based on the diameter, but in order to improve control accuracy, it is better to set D ₂ and D ₃ as large as possible. and,
The coil diameter input from the coil diameter calculation circuit 7 is D ₃
The difference between the output of the coil turns calculation circuit 8 at the time when the coil diameter becomes D ₂ and the output of the coil turns calculation circuit 8 at the time when the coil diameter becomes D 2, that is, the number of coil turns unwound until the coil diameter changes from D ₃ to D ₂ . Compute N ₂ ,
Furthermore, the above coil turns is added to the coil turns of the coil turns calculation circuit 8 which is output when the coil diameter is D ₂ .
The number of turns obtained by adding N ₂ is output to the subtraction command circuit 10.

In the deceleration command calculation circuit 10, the number of coil turns from the deceleration start turns calculation circuit 9 is input, and when it matches the coil rewind amount output from the coil turns calculation circuit 8, that is, when equation (7) is established, the number of coil turns of the steel plate is calculated. Outputs a speed deceleration command.

That is, in the conventional device, as shown in equation (7), N ₁ =
Each coil diameter D ₁ to _{D 3} is set with a relationship of N ₂ . However, D ₁ is a value known in advance.
Here, N ₁ is an unknown quantity, and N ₂ is also an unknown quantity. Therefore, in order to predict the number of turns N ₁ between D ₁ and D ₂ at the time of the coil diameter D ₂ using this control, the above settings are made and the number of turns N of the coil until the coil diameter changes from D ₃ to D ₂ is calculated. ₂ , and the value N ₂ is N ₁ (N ₁ = N ₂ )
It is intended to be used as a Moreover, as shown in Fig. 2, (D ₁ −D ₀ )<(D ₃ −D ₂ )=(D ₂ −D ₁ )
By setting this, in other words, by setting large values for D ₂ and D ₃ , variations in measured values due to fluctuations in rewinding speed, etc. are absorbed, and a deceleration command can be output with high accuracy at D ₁ . .

In other words, in conventional equipment, the coil diameter is
It would be sufficient to detect the time point _D1 and send a deceleration command, but in actual machinery, it is difficult to measure the coil diameter D due to fluctuations in the coil unwinding speed, slippage between the pinch roll and the coil, etc. Causes variation. Therefore, in the conventional device, D ₂ and D ₃ are set in order to detect D ₁ with high accuracy. By the way, it goes without saying that errors due to the above will occur in the detection of D ₂ and D ₃ , but
The error is smaller than the detection of D ₁ (because D ₁ <
D ₂ , D ₃ ) Yes.

In this way, the conventional entry side automatic deceleration control device is (5)
As shown in Equation (6), the structure does not take into account changes in the coil space factor or the amount of slip between the pinch roll and the steel plate, so when changes in the space factor occur, ( Since Equations 5) and (6) do not hold, the number of turns that output the deceleration command changes, resulting in errors in deceleration control.

This invention was made to eliminate the above-mentioned drawbacks of the conventional method, and by taking into account errors caused by changes in the space factor of the coil, amount of slip between the pinch roll and the steel plate, etc., into the calculation formula, It is an object of the present invention to provide an entry side automatic deceleration control device that can always output a desired deceleration command.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the entry side automatic deceleration control device of the present invention will be described below with reference to the drawings.

In Fig. 3, 1 is an unwinding machine, 2 is a pinch roll, 3 is a coiled steel plate, 4 is a rotation amount measuring device, and 5
6 is a speed calculation circuit that calculates the unwinding speed of the steel plate; 7 is a coil diameter calculation circuit that calculates the coil diameter of the coiled steel plate 3 being unwound by the unwinding machine 1; 8 is a coil turns calculation circuit that counts the amount of unwinding of the coiled steel plate 3 being rewound by the unwinding machine; 90 is a coiled steel plate 3;
10 is a deceleration circuit that outputs a deceleration command when the number of turns calculated by a turns correction circuit 11 (described later) matches the number of turns of the coiled steel plate being rewound by the unwinding machine 1. The command calculation circuit 11 is a turns correction circuit that corrects the turns calculated in the turns calculation circuit 90.

In Figure 3, 1, 2, 3, 4, 5, 6,
7, 8, and 10 are the same parts as the conventional circuit configuration, and in the present invention, 11 circuit configurations are added in order to solve the problems of the conventional technology.

The operation of the entry side automatic deceleration control device of the present invention will be explained based on FIGS. 2 and 3.

In FIG. 3, a rotation amount measuring device 4 is attached to the unwinding machine 1 and outputs a pulse corresponding to the rotation of the coiled steel plate 3, for example, one pulse every time the coiled steel plate 3 rotates once.

Further, the steel plate movement measuring device 5 attached to the pinch roll 2 outputs a pulse according to the rotation of the pinch roll 2 in order to obtain a signal l proportional to the distance the steel plate has moved.

In the speed calculation circuit 6, the steel plate movement amount measuring device 5
The velocity V of the steel plate 3 is calculated by measuring the pulses for a certain time t.

The coil diameter calculation circuit 7 uses the pulse of the steel plate movement amount measuring device 5, that is, the signal l corresponding to the movement amount of the steel plate 3, to calculate (8) every time the coiled steel plate 3 rotates once.
The coil diameter D of the coiled steel plate 3 is calculated using the formula.

D=l/π...Equation (8) The turns calculation circuit 90 executes calculations based on the following principle.

The amount of movement l' of the steel plate after the speed of the coiled steel plate starts decelerating until the deceleration is completed is given by l'=1/2×V ² /α (9).

Here, V is the speed of the steel plate, and α is the deceleration rate of the speed of the steel plate.

Furthermore, if the coil diameter at the start of deceleration is D ₁ , the coil diameter at the end of deceleration is D ₀ , and the thickness of the steel plate 3 is h,
The above movement amount l' is expressed as l'=D ₁ −D ₀ /2h×πD ₀ +D ₁ −D ₀ /2h×(D ₁ −D ₀ /2h+1)×πh (10).

Therefore, the coil diameter D ₁ at the start of deceleration can be obtained from this equation (10).

Now, in Fig. 2, the coil diameters of the coiled steel plate 3 are D ₀ , D ₁ , D ₂ , D ₃ , and D ₄ , and the number of turns of the coil between D ₄ and D ₃ is N ₃ , and D ₃ and D The number of turns of the coil between ₂
N ₂ , the number of coil turns between D ₂ and D ₁ is N ₁ .

Furthermore, D ₁ , D ₂ , D ₃ , and D ₄ are determined so that equation (11) holds true.

D ₄ - D ₃ = D ₃ - D ₂ = D ₂ - D ₁ ... Formula (11) Also, assuming that the thickness of the steel plate is constant, D ₄ - _{D 3} = 2 × h × α ₃ × N ₃ ...(12) formula D ₃ −D ₂ =2×h×α ₂ ×N ₂ ...(13) formula D ₂ −D ₁ =2×h×α ₁ ×N ₁ ...(14) formula here Here, α ₁ , α ₂ , α ₃ are correction amounts for the space factor of the coil, the amount of slip between the pinch roll and the steel plate, etc.

From formulas (11), (12), (13), and (14), α ₃ ×N ₃ = α ₂ ×N ₂ ... (15) formula α ₂ ×N ₂ = α ₁ ×N ₁ ... (16) From equation (15), if we calculate the number of coil turns N ₃ while the coil diameter of the steel plate changes from D ₄ to D ₃ and the number of coil turns N ₂ while the coil diameter changes from D ₃ to D ₂ , we get: α ₂ =N ₃ /N ₂ ×α ₃ =k×α ₃ (17) (k is a constant).

From equation (11) and the fact that the plate thickness h is constant,
It is assumed that N ₂ =N ₃ and it is expected that k=1. However, depending on the space factor of the coil, the amount of slip between the pinch roll and the steel plate, etc., a result of N ₂ ≠ N ₃ may occur. Therefore, the values of N ₂ to N ₁ can be accurately calculated in advance by correcting the number of coil turns based on the value of k described above.

Here, it is assumed that the constant k is constant regardless of the value of the coil diameter. That is, the coiled steel plate 3
Since the winding conditions are constant regardless of the coil diameter, assuming that the constant k is constant, α ₁ = k × α ₂ = k (k × α ₃ ) = k ² α ₃ , and the above (16 ), from formula (17), N ₁ = α ₂ / α ₁ N ₂ = α ₃ / α ₂ kN ₂ = α ₃ /k ² α ₃ kN ₂ Therefore, N ₁ = 1/k×N ₂ ... Equation (18) is obtained.

In the turns calculation circuit 90 of FIG. 3, D ₁ , D ₂ , D ₃ , and D ₄ are determined so that equation (11) holds, and the coil diameter is determined while the coil diameter of the steel plate changes from D ₄ to D ₃ . Number of turns N ₃
Then, the number of coil turns N ₂ while the coil diameter changes from D ₃ to D ₂ is calculated, and the constant k is determined using equation (17).

The constants k and N ₂ are sent from the turns calculation circuit 90 to the turns correction circuit 11, and the turns correction circuit 11 calculates the following:
The number of coil turns N ₁ is calculated by calculating equation (18).

Then, when the coil diameter of the steel plate 3 matches D ₂ , the winding number correction circuit 11 is sent to the deceleration command calculation circuit 10.
The coil turns number obtained by adding the coil turns number N ₁ and the output of the coil turns calculation circuit 7 obtained via the turns number calculation circuit 90 is sent out. The deceleration command calculation circuit 10 compares the coil winding number value with the coil unwinding amount counted by the calculation circuit 8, and outputs a deceleration command for the speed of the steel plate when they match.

In the above embodiment, a coiled steel plate in a steel plant was explained, but it goes without saying that this control device can be applied to coiled materials such as paper as well, and the same effects as in the above embodiment can be achieved. play.

As described above, according to the present invention, correction of errors caused by changes in the coil space factor, coil slip, etc. is introduced into the calculation of the number of turns of the coil at which deceleration starts, so that automatic deceleration control on the entry side of the coil can be performed reliably. Moreover, it can be performed with high precision.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional entrance automatic deceleration device, FIG. 2 is an explanatory diagram for explaining the operation of the present invention, and FIG. 3 is an implementation of the entrance automatic deceleration control device of the present invention. FIG. 2 is a block diagram showing an example. In the figure, 1 is a rewinding machine, 2 is a pinch roll,
3 is a coiled steel plate, 4 is a rotation amount measuring device, 5 is a steel plate movement amount measuring device, 6 is a speed calculation circuit, 7 is a coil diameter calculation circuit, 8 is a coil turns calculation circuit, 90 is a turns number calculation circuit, 10 1 is a deceleration command calculation circuit, and 11 is a winding number correction circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. An unwinding machine that rewinds a coiled strip material, a rotation amount measuring device that measures the amount of rotation of this unwinding machine, a movement amount measuring device that measures the amount of movement of the strip material, and the above-mentioned rotation. A coil turns calculation circuit that counts the amount of unwinding of the coiled strip material using a measurement signal from a quantity measuring device, and a coil diameter of the coiled strip material based on measurement signals from the rotation amount measuring device and the movement amount measuring device. A coil diameter calculation circuit that calculates a coil diameter calculation circuit, a speed calculation circuit that calculates the rewinding speed of the strip material based on the measurement signal of the movement amount measuring device, and a coil diameter calculation circuit that calculates the unwinding speed of the strip material based on the measurement signal of the movement amount measuring device. Input the return speed V, derive the movement amount l' of the strip material from the start of deceleration of the unwinding machine to the completion of deceleration, and calculate this movement amount l',
Determine the coil diameter D ₁ at the start of deceleration from the plate thickness h of the strip material and the coil diameter D ₀ at the end of deceleration, and based on this coil diameter D ₁ , D ₄ − D ₃ = D ₃ − D ₂ = D ₂ - D ₁ , and determine the number of coil turns N _{3 and the coil diameter between D 3 and} D ₂ while the coil diameter changes _from D ₄ to D _{3 .} The constant K for calculating the number of coil turns N ₁ while the coiled strip material changes from the coil diameter D ₂ to the coil diameter D ₁ at the start of deceleration is determined by the number of coil turns N ₂ during the change to . = N ₃ /N ₂ Based on the number of turns calculation circuit, the constant K derived by this number of turns calculation circuit, and the number of turns N ₂ above, calculate the number of turns N ₁ between the coil diameters D ₁ and D ₂ , N ₁ = 1/KN ₂ and outputs this, the coil turns number N ₁ from this turns correction circuit, and the coil unwinding amount counted by the coil turns calculation circuit after the coil diameter is D ₂ . An entry side automatic deceleration control device comprising a deceleration command calculation circuit that generates a deceleration command when the values match.