JP4708842B2 - Conveyor conveyor control device and conveyor method - Google Patents

Description

  The present invention relates to a transport conveyor control apparatus and a control method for transporting a rubber sheet fed from a sheeting roll, and in particular, to maintain a constant tension of the rubber sheet fed from the sheeting roll, The present invention relates to a transport conveyor control device and a transport conveyor control method capable of improving quality.

  As a method for forming a belt-shaped rubber sheet (for example, an unvulcanized rubber sheet) that is a constituent member of a tire or the like, a roller head extruder having a pair of sheeting rolls at an extrusion port is generally used. Since the belt-like rubber sheet extruded in series from the roller head extruder is in a high temperature condition and unstable in shape for a while after being extruded, it is transported by a transport conveyor and carried into a cooling device (for example, a patent) Reference 1).

  During the conveyance of such a rubber sheet, it is necessary to always convey the rubber sheet with a certain tension in order to stabilize the shape of the rubber sheet sent out from the sheeting roll.

  Therefore, in the conventional conveyor control device, the delivery speed of the rubber sheet to be delivered is substantially constant by draw control based on the rotational speed of the sheeting roll measured by an encoder or the like and a predetermined constant draw ratio. The detection signal from the detector provided near the exit of the roller head extruder (immediately after the sheeting roll) in order to calculate the reference speed of the conveyor and detect the tension of the rubber sheet delivered from the sheeting roll. By the feedback control based on the above, the calculated reference speed of the conveyor is corrected as appropriate, and the conveyor speed of the conveyor is controlled so that the tension of the rubber sheet sent out is always constant.

  The draw ratio used for the draw control for calculating the reference speed is a value that determines the ratio between the rotation speed of the sheeting roll and the conveyance speed (or rotation speed) of the conveyor, and is often a roller diameter, etc. The value is close to the ratio obtained from mechanical components.

Further, in practice, the feeding speed of the rubber sheet fed from the sheeting roll is determined by the slip (slip) generated between the surface of the sheeting roll and the rubber sheet. Since the linear velocity obtained from the roll diameter is slower than the theoretical value of the feeding speed of the rubber sheet, the draw ratio is generally taken into consideration.
JP-A-7-60821

  However, the control device and control method for the transport speed of the transport conveyor as described above have the following problems.

  In the rubber sheet molding process, the state of various variable elements changes (for example, the type of the rubber material of the rubber sheet is changed as the product is changed, the roll gap width of the pair of sheeting rolls is adjusted, the sheeting roll Change of the rotation speed, etc.).

  When the state of these variable elements changes, the ratio of the slip (slip ratio) generated between the sheeting roll surface and the rubber sheet changes according to the state of the variable elements, and the peripheral speed of the sheeting roll and the rubber The speed ratio with the sheet feeding speed changes.

  As a result, the value of the constant draw ratio used for the above-described draw control is no longer an appropriate value, and the reference speed of the conveyer calculated by the draw control is a speed that is significantly different from the rubber sheet feed speed, There has been a case where the conveying speed of the conveying conveyor with respect to the feeding speed of the rubber sheet is excessive or decreased and the tension of the rubber sheet cannot be kept constant.

  If the tension of the rubber sheet sent out from the sheeting roll is disturbed, the rubber sheet will be cut and bent, which will have a serious adverse effect on the quality of the rubber sheet, and if the rubber sheet is cut off, Adjustment work and follow-up work in a subsequent process occur, and productivity is reduced. In addition, if the rubber sheet is bent, it will be involved in a rotating body such as a conveyor and cause trouble.

  Conventionally, in this case, the actual situation is that the operator has manually adjusted the draw ratio according to changes or changes in the state of variable elements such as the rotational speed of the sheeting roll, and the draw value that is the optimum value The adjustment to the ratio largely depends on the experience of the operator, and the productivity is not excellent.

  The feedback control based on the detection of the tension of the rubber sheet is intended to correct the transport speed of the transport conveyor so as to correct a slight tension fluctuation, and the correction range is small, and the change in the state of the variable element is large. It is not possible to make corrections that follow this.

  The present invention has been made in view of such problems, and in a rubber sheet forming process by an extruder provided with a pair of sheeting rolls, a conveyor for handling changes in variable elements such as a sheeting roll rotation speed. Conveying speed can be controlled and the tension of the rubber sheet fed from the sheeting roll is kept constant to prevent the rubber sheet from being cut or bent, thereby improving the productivity and quality of the rubber sheet. It aims at providing a control device and a conveyance conveyor control method.

  Therefore, in the transport conveyor control device that transports the rubber sheet fed from the pair of sheeting rolls, when the state of the variable element that causes the speed ratio between the peripheral speed of the sheeting roll and the feeding speed of the rubber sheet to change is changed. Even so, the conveyance speed of the conveyor can be controlled so as to keep the tension of the rubber sheet to be sent out constant, and the rubber sheet can be prevented from being cut or bent to improve the productivity and quality of the rubber sheet. be able to.

In order to achieve the above-described object, the present invention has the following features. A feature of the present invention is that a rubber material (for example, rubber material 30) extruded by an extruder (for example, roller head extruder 1) is formed into a band-shaped rubber sheet (for example, an unvulcanized rubber sheet 18). In a transport conveyor control device (for example, the control device 100) that controls the transport speed of a transport conveyor (for example, the transport conveyor 20) that transports the rubber sheet fed from a sheeting roll (for example, the sheeting rolls 10 and 11), Among the variable elements related to the setting or operation that changes in the rubber sheet molding process, the speed ratio between the peripheral speed of the sheeting roll and the feed speed of the rubber sheet fed from the sheeting roll (for example, the follow-up rate or slip rate) ) Variable factors that cause the change (eg That the roll gap width W of the rubber material 30 of the type and the pair of sheeting rolls 10 and 11 of the rubber sheet 18, a predetermined numerical value corresponding to the sheeting, such as roll rotation speed VR1) to be measured, the rubber sheet A rubber property follow-up rate A that is a predicted follow-up rate of the speed ratio due to the rubber property of the rubber material, and a rotation speed of the sheeting roll (for example, a sheeting) that is the numerical value set in advance corresponding to the variable element Roll rotation slip coefficient B obtained by preliminarily predicting the rate of change of the speed ratio that changes according to the roll rotation speed VR1), and the numerical value set in advance corresponding to the variable element. The gap width W between the sheeting rolls and the gap that is the maximum width of the adjustment range in the gap width adjustment of the pair of sheeting rolls. A storage unit (for example, storage unit 106) that stores a gap width slip coefficient C obtained by previously predicting a coefficient of change of the speed ratio that changes according to the maximum adjustment width Wmax, and rotation of the sheeting roll Using the rotational speed measurement unit that measures the speed VR1, the numerical value stored in the storage unit, the rotational speed VR1 of the sheeting roll, the gap width W, and the gap maximum adjustment width Wmax, the predicted tracking of the speed ratio is performed. A predicted follow-up rate deriving unit (for example, a predicted follow-up rate deriving unit 102) that calculates the rate F based on the following Equation 1;
Formula 1... F = (A−VR1 × B− (Wmax−W) × C)
Using the predicted follow-up rate F, the rotational speed VR1 of the sheeting roll, and the reference draw ratio Dr, which is the ratio of the radius of the sheeting roll to the peripheral radius from the drive roll center of the conveyor to the conveyor surface, A reference speed calculation unit (for example, a reference speed calculation unit 103) that calculates a reference speed VR2 that serves as a reference for the transfer speed of the transfer conveyor based on the following equation (2);
Formula 2 ... VR2 = VR1 * Dr * F
A feedback calculation unit (for example, feedback calculation unit 104) that corrects the reference speed and calculates a target speed of the transfer speed of the transfer conveyor, and controls the transfer speed of the transfer conveyor according to the reference speed or the target speed The gist is to do.

  According to the transport conveyor control device according to the features of the present invention, the predicted value derived by the predicted value deriving unit is a state of a variable element that causes a change in the speed ratio between the circumferential speed of the sheeting roll and the feeding speed of the rubber sheet. (For example, the setting state of the rubber material in the rubber sheet molding process, the roll gap width of the pair of sheeting rolls, the operating state of the rotational speed of the sheeting roll, etc.) Therefore, the predicted value is always a value that approximates the speed ratio between the peripheral speed of the sheeting roll and the feeding speed of the rubber sheet, even when the state of the variable element changes. .

  The reference speed calculation unit is a case where the state of the variable speed described above is changed by applying such a predicted value in the draw control for calculating the reference speed of the conveyer from the measured rotational speed of the sheeting roll. In addition, it is possible to calculate the reference speed of the transport conveyor that is optimal for the rubber sheet feed speed.

  Therefore, in the transport conveyor control device that transports the rubber sheet fed from the pair of sheeting rolls, when the state of the variable element that causes the speed ratio between the peripheral speed of the sheeting roll and the feeding speed of the rubber sheet to change is changed. Even so, the conveyance speed of the conveyor can be controlled so as to keep the tension of the rubber sheet to be sent out constant, and the rubber sheet can be prevented from being cut or bent to improve the productivity and quality of the rubber sheet. be able to.

Further, in the transport conveyor control device according to the present invention, a plurality of the rubber property follow-up rates A stored in the storage unit are set corresponding to the type of the rubber material, and the predicted follow-up rate deriving unit is Using the type of rubber material as the state of the variable element, obtaining a determination signal associated with the type of rubber material, and a plurality of predicted values of the rubber properties stored in the storage unit according to the acquired determination signal It is desirable to select one rubber property follow-up rate A from among these and derive the predicted follow-up rate F using the selected rubber property follow-up rate A.

  According to such a conveyer control device, even when the rubber material of the rubber sheet is changed to a rubber material having a different rubber physical property, a predicted value corresponding to the rubber physical property of the rubber material is derived and the rubber physical property is obtained. The reference speed of the conveyer corresponding to the resulting speed ratio can be obtained, and the tension of the rubber sheet fed from the sheeting roll can be kept constant.

Further, in the transport conveyor control device according to the present invention, the roll rotation slip coefficient B stored in the storage unit is determined by the peripheral speed of the sheeting roll and the feeding speed of the rubber sheet with respect to the rotational speed of the sheeting roll. It is desirable that the change rate of the slip ratio, which is the speed ratio, is a value obtained by predicting in advance, and the slip ratio is calculated based on the following Equation 3.
Formula 3 ... slip ratio = (sheeting roll peripheral speed-rubber sheet feed speed) / sheeting roll peripheral speed

Moreover, the conveyance conveyor control apparatus concerning this invention is a cooling device which cools the rubber shortage signal which is the signal of the rubber material shortage inside the roller head extruder which has the said sheeting roll, and the rubber sheet conveyed by the said conveyance conveyor. A speed control unit that lowers the rotational speed of the sheeting roll based on a stay signal that is a signal that the rubber sheet has stayed may be further provided.

  According to such a conveyer control device, even when the rotation speed of the sheeting roll that feeds the rubber sheet changes, a predicted value corresponding to the rotation speed of the sheeting roll is derived, and the rotation speed of the sheeting roll is calculated. The reference speed of the conveyer corresponding to the speed ratio that changes accordingly can be obtained, and the tension of the rubber sheet fed from the sheeting roll can be kept constant.

  Furthermore, in the transport conveyor control device according to the feature of the present invention, the numerical value stored in the storage unit (for example, the storage unit 106) changes according to the roll gap width (for example, the roll gap width W). A gap width coefficient (for example, gap width slip coefficient C) obtained by predicting a change rate of the deceleration ratio (for example, slip ratio) in advance and coefficientizing the prediction ratio deriving unit (for example, predicted follow-up rate deriving unit 102) Is measured based on a detection signal from a gap width detector (for example, the gap width detector 14) that detects the roll gap width by setting the roll gap width of the pair of sheeting rolls to the state of the variable element. The roll gap width is acquired, and based on the acquired roll gap width and the gap width coefficient stored in the storage unit, the predicted value Derivation, it is preferable to.

  According to such a conveyer control device, even when the roll gap width of the pair of sheeting rolls changes, a predicted value corresponding to the roll gap width is derived, and the speed that changes according to the roll gap width. The reference speed of the transfer conveyor corresponding to the ratio can be obtained, and the tension of the rubber sheet fed from the sheeting roll can be kept constant.

Still another feature of the present invention is that a rubber material (eg, rubber material 30) extruded by an extruder (eg, roller head extruder 1) is formed into a belt-like rubber sheet (eg, unvulcanized rubber sheet 18). In the conveyance conveyor control method for controlling the conveyance speed of a conveyance conveyor (for example, conveyance conveyor 20) that conveys a rubber sheet fed from a pair of sheeting rolls (for example, sheeting rolls 10 and 11), the rubber sheet forming step Among the variable elements relating to the setting or operation that changes in the above, the cause of the change in the speed ratio (for example, the follow-up rate or slip rate) between the peripheral speed of the sheeting roll and the feed speed of the rubber sheet fed from the sheeting roll Variable elements (for example, the rubber sheet 18 set in accordance with the type switching) The state of the material material 30, the state of the roll gap width W of the pair of sheeting rolls 10 and 11, the measured sheeting roll rotation speed VR 1, etc.) and the variable factors that cause the speed ratio to change are preset. The rubber property follow-up rate A, which is the predicted follow-up rate of the speed ratio due to the rubber physical properties of the rubber material of the rubber sheet, and the value set in advance corresponding to the previous variable element. The roll rotation slip coefficient B obtained by previously predicting a coefficient of change of the speed ratio that changes according to the rotation speed of the sheeting roll, and the numerical value set in advance corresponding to the variable element, Gap width adjustment that is the maximum width of the adjustment range in the gap width W between the pair of sheeting rolls and the gap width adjustment of the pair of sheeting rolls A step of calculating a predicted follow-up rate F of the speed ratio based on the following equation 1 using a gap width slip coefficient C obtained by predicting a coefficient of change of the speed ratio that changes in accordance with Wmax and converting it into a coefficient ( Step 20)
Formula 1... F = (A−VR1 × B− (Wmax−W) × C)
Using the predicted follow-up rate F, the rotational speed VR1 of the sheeting roll, and the reference draw ratio Dr, which is the ratio of the radius of the sheeting roll to the peripheral radius from the drive roll center of the conveyor to the conveyor surface, A step (for example, step 30) of calculating a reference speed VR2 serving as a reference of the transfer speed of the transfer conveyor based on the following equation 2
Formula 2 ... VR2 = VR1 * Dr * F
Correcting the reference speed and calculating a target speed of the transfer speed of the transfer conveyor (for example, step 40), and controlling the transfer speed of the transfer conveyor in accordance with the reference speed or the target speed (for example, And step 50).

  Even if the state of a variable element that causes a change in the speed ratio between the peripheral speed of the sheeting roll and the feeding speed of the rubber sheet is changed with respect to the transport conveyor that transports the rubber sheet fed from the pair of sheeting rolls The conveyance speed of the conveyor can be controlled so as to keep the tension of the rubber sheet sent out constant, and the conveyance and the quality of the rubber sheet can be improved by preventing the rubber sheet from being cut or bent. A conveyor control device and a transfer conveyor control method can be provided.

  Next, an example of an embodiment of a transport conveyor control device according to the present invention will be described with reference to the drawings. In addition, it should be noted that the drawings described in the following description are schematic and ratios of dimensions and the like are different from actual ones.

  FIG. 1 is a diagram illustrating a control device 100, a roller head extruder 1, and transport conveyors 20 and 22, which are transport conveyor control devices in the present embodiment. The control device 100 is a control device that controls the operations of the transport conveyors 20 and 22 and is a control device that controls the operation of the roller head extruder 1 including the pair of sheeting rolls 10 and 11.

  The roller head extruder 1 heats and melts the rubber material 30 made of the added kneaded rubber inside, and pushes out the melted rubber material 30 from the base 4 by the screw 2 that is driven and rotated by the screw motor 3. Inside the roller head extruder 1, there is provided a both-rubber detection switch 5 for detecting that the amount of the charged rubber material 30 is insufficient and outputting a rubber shortage signal.

  A pair of sheeting rolls 10 and 11 provided in the roller head extruder 1 are cylindrical rollers for forming and feeding the rubber material 30 extruded from the base 4 into a belt-shaped unvulcanized rubber sheet 18, The sheeting roll motor 12 is rotated by being driven.

  In addition, the pair of sheeting rolls 10 and 11 has a roll gap width W (mm) between the roll surfaces of each other in order to change the sheet thickness to a predetermined sheet thickness according to the type change of the unvulcanized rubber sheet 18 to be manufactured. Is configured to be adjustable. A gap width detector 14 for measuring the adjusted roll gap width W (mm) is provided in the vicinity of the sheeting roll 10.

  Further, a rotary encoder 13 which is a rotation detector for measuring the rotation speed of the sheeting roll 10 is attached to the rotation shaft of the sheeting roll 10.

  The conveyer 20 is a conveyer that conveys the unvulcanized rubber sheet 18 fed from the sheeting rolls 10 and 11 of the roller head extruder 1, and the control device 100 controls the rotation speed of the conveyer motor 21 to be predetermined. Operates at a transfer speed of.

  In the present embodiment, the transport speed of the transport conveyor 20 controlled by the control device 100 is determined by the rotational speed of the transport conveyor motor 21, and the drive system and transport after the control device 100 outputs a speed command. The speed loss due to the conveyor motor 21 is ignored.

  The transport conveyor 22 is a conveyor that takes the unvulcanized rubber sheet 18 transported by the transport conveyor 20 and transports it to the downstream process, and operates when the control device 100 controls the transport conveyor motor 23. . The transport speed of the transport conveyor 22 is controlled by the control device 100 to be equal to the transport speed of the transport conveyor 20 or a transport speed that maintains a predetermined speed ratio with respect to the transport speed of the transport conveyor 20.

  The unvulcanized rubber sheet 18 fed from the sheeting rolls 10 and 11 is temporarily cooled while being transported on the transport conveyors 20 and 22 because it is in a high temperature condition and unstable in shape for a while after being extruded. It is carried into a subsequent cooling device 150 (not shown) and is finally cooled to form a stable shape.

  Immediately after the sheeting rolls 10 and 11, a dancer roll 16 is provided. The dancer roll 16 rotates in contact with the surface of the unvulcanized rubber sheet 18 fed from the sheeting rolls 10 and 11 and can swing in the direction perpendicular to the surface of the unvulcanized rubber sheet 18. And has a tension sensor 15 for measuring the swinging displacement amount.

  Next, the control apparatus 100 which controls operation | movement of the roller head extruder 1 mentioned above and the conveyance conveyor 20 is demonstrated.

  The control device 100 includes a CPU that executes a control sequence in the molding process of the unvulcanized rubber sheet 18, a ROM that stores a logic program that defines the control sequence, and a RAM that stores a rubber property follow-up rate A and various coefficients, which will be described later. Further, it is configured by a PLC (Programmable Logic Controller) or a personal computer equipped with I / O used for input / output with an external device.

  Connected to the input side of the control device 100 are the rubber detection switch 5, the rotary encoder 13, the gap width detector 14, the tension sensor 15, the control box 40, which will be described later, and a stay signal line from the cooling device 150. ing.

  On the output side of the control device 100, an inverter circuit 41 for driving and controlling the screw motor 3, an inverter circuit 42 for driving and controlling the sheeting roll motor 10, an inverter circuit 43 for driving and controlling the conveyor conveyor motor 21, An inverter circuit 44 for driving and controlling the conveyor motor 23 is connected. Each of the inverter circuits 41 to 44 is configured to be able to vary the rotation speed of each connected motor in accordance with a speed command signal output from the control device 100.

  FIG. 2 is a block diagram showing the flow of electrical signals in the control device 100. The control device 100 is connected to an operation box 40 that is an operation unit for switching the type of the unvulcanized rubber sheet 18 to be manufactured. The operation box 40 is disposed at a position that can be operated by the operator, and is attached with a digi switch or the like that designates a pre-managed product number in order to switch the product type of the unvulcanized rubber sheet produced in the roller head extruder 1. It is the operation part. The product number designated by operating the operation box 40 is stored in the product number storage unit 101 of the control device 100. The product number storage unit 101 includes a RAM having a storage area.

  The extruder control unit 110 has a function of controlling the roller head extruder 1, and outputs a speed command to the inverter circuits 41 and 42 based on the product number stored in the product number storage unit 101, and the roller head The screw motor 3 and the sheeting roll motor 12 of the extruder 1 are controlled.

  The extruder control unit 110 is provided with a rubber shortage signal from the rubber amount detection switch 5 for detecting a shortage of rubber material inside the roller head extruder 1 and an after-feed conveyor 22 as an interlock signal from the outside. A stay signal input from the cooling device 150 or the like is input. The stay signal is a signal that is input when a stay of a member or the like occurs in the cooling device 150 or a manufacturing process that is a subsequent stage.

  When any of the interlock signals described above is turned on, the extruder control unit 110 changes the speed command signal to the inverter circuits 41 and 42 and switches the rotational speeds of the screw motor 3 and the sheeting roll motor 12 to the low speed state. When the interlock signal input is turned off, the rotational speeds of the screw motor 3 and the sheeting roll motor 12 are returned to the original speed.

  The control of the transport conveyor 20 in the control device 100 is performed by the predicted follow-up rate derivation unit 102, the reference speed calculation unit 103, the feedback calculation unit 104, and the speed conversion unit 106 illustrated in FIG.

  The model number storage unit 101, the rotary encoder 13, the gap width detector 14, the storage unit 106, and the like are connected to the prediction tracking rate deriving unit 102. Based on the detection signals and information obtained from these, the sheeting roll A predicted follow-up rate F (%), which is a predicted value of the speed ratio between the peripheral speed and the unvulcanized rubber sheet feed speed, is derived. More specifically, it will be described later with reference to FIG.

Here, the peripheral speed (mm / min) of the sheeting roll 10 is a linear speed obtained from the rotational speed (min ⁻¹ ) of the sheeting roll 10 and its roll diameter r1 (mm), This is the theoretical delivery speed of the unvulcanized rubber sheet 18 ignoring slipping with the unvulcanized rubber sheet 18.

The reference speed calculation unit 103 is based on the rotation speed of the sheeting roll (sheeting roll rotation speed VR1) calculated based on the measurement signal from the rotary encoder 13, and will be described later with reference draw ratio Dr and predicted tracking rate F (%). Is used to calculate a reference speed VR2 (min ⁻¹ ) that serves as a reference speed for controlling the rotation speed of the conveyor motor 21.

The following rate (%) and slip rate (%) referred to in the present embodiment are the peripheral speed (mm / min) of the sheeting roll 10 and the feed speed (mm / min) of the unvulcanized rubber sheet 18. The speed ratio is defined by the following formulas (1) and (2).

Based on the detection signal from the tension sensor 15 that detects the amount of displacement of the dancer roll 16, the feedback calculation unit 104 uses the reference speed VR2 calculated by the reference speed calculation unit 103 so that the swinging dancer roll maintains a fixed position. (Min ⁻¹ ) is corrected, and a target speed VR3 (min ⁻¹ ) that is the rotational speed of the conveyor motor 21 is determined.

The speed conversion unit 105 converts the target speed VR3 (min ⁻¹ ) determined by the feedback calculation unit 104 into a predetermined speed command signal and outputs it to the inverter circuit 43, and rotates the transport conveyor motor 21 to rotate the transport conveyor 20. To control. Further, the speed converter 105 outputs the same speed command signal as the speed command signal output to the inverter circuit 43 to the inverter circuit 44 in order to control the transport conveyor 22 so as to be at the same speed as the transport conveyor 20.

  Next, the processes of the predicted tracking rate deriving unit 102, the reference speed calculating unit 103, and the feedback calculating unit 104 will be described more specifically with reference to FIG. FIG. 3 is a block diagram showing a processing flow of the predicted tracking rate deriving unit 102, the reference speed calculating unit 103, and the feedback calculating unit 104.

As shown in the figure, the reference speed calculation unit 103 uses the sheeting roll rotational speed VR1 (min ⁻¹ ) measured based on the measurement signal from the rotary encoder 13 as an input parameter, and uses the reference draw ratio Dr and the prediction. Based on the follow-up rate F (%), it has a function of performing a draw control for calculating a reference speed VR2 (min ⁻¹ ) for controlling the transport conveyor motor 21 that drives the transport conveyor 20. Note that the sheeting roll rotational speed VR1 (min ⁻¹ ), which is an input parameter, is a value calculated by the control device 100 by converting the rotational speed per unit time based on the detection signal from the rotary encoder 13. A calculation formula (3) used for calculating the reference speed VR2 (min ⁻¹ ) in the reference speed calculation unit 103 is shown below.

The reference draw ratio Dr in the equation (3) is the radius r1 (mm) of the sheeting roll 10 and the peripheral radius from the roll center to the conveyor surface in the driving roll 26 of the conveyor 20 as shown in the following equation (4). It is a value determined by a ratio with r2 (mm). (If the conveyor motor 21 is a geared motor, the gear ratio is taken into account in equation (4).)

When the value of the radius r1 (mm) and the value of the peripheral radius r2 (mm) are the same and the value of the reference draw ratio Dr is 1.0, the expression (3) is expressed as VR2 (min ⁻¹ ) = It can be replaced with VR1 × F.

Further, the predicted follow-up rate F (%) in the expression (3) is the state of three variable elements, i.e., the type of the rubber material 30 of the unvulcanized rubber sheet 18 to be manufactured, and ii) the measured sheeting. Roll rotation speed VR1 (min ⁻¹ ), iii) The measured roll gap width W (mm) of the sheeting rolls 10 and 11 is a variable parameter, and the circumference of the sheeting roll 10 in a predetermined state of these variable elements. This is a predicted value derived by predicting in advance the speed ratio of the feed speed (mm / min) of the unvulcanized rubber sheet 18 to the speed (mm / min).

The predicted follow-up rate deriving unit 102 derives a predicted follow-up rate F (%) by the following equation (5) based on the state of each variable element.

The rubber property follow-up rate A (%) in the formula (5) is a rubber of the kind of the rubber material 30 of the unvulcanized rubber sheet 18 to be molded in calculating the reference speed VR2 (min ⁻¹ ) of the conveyor motor 21. This is due to physical properties (such as the surface roughness of rubber and the ease of grouping into a sheet shape). This is a predicted value set in advance by predicting a follow-up rate that is a speed ratio between the peripheral speed (mm / min) of the sheeting roll 10 and the delivery speed (mm / min) of the unvulcanized rubber sheet 18.

  The rubber property follow-up rate A (%) is set in advance by an operator or the like corresponding to the type of rubber material, and is stored in a plurality in the storage unit 106 of the control device 100 (see FIG. 2).

  The product number stored in the product number storage unit 101 when the operation box 40 is operated is a number previously associated with the type of the rubber material 30, and the predicted tracking rate deriving unit 102 stores the product number in the product number storage unit 101. A determination signal (for example, a Read signal from the RAM constituting the product number storage unit 101) indicating the received product number is acquired from the product number storage unit 101 and stored in the storage unit 106 in accordance with the acquired determination signal. One rubber property follow-up rate A (%) is selected from a plurality of rubber property follow-up rates A (%).

  The roll rotation slip coefficient B in the equation (5) changes according to the rotation speed of the sheeting roll 10. The rate of change of the slip ratio (%), which is the speed ratio between the peripheral speed (mm / min) of the sheeting roll 10 and the delivery speed (mm / min) of the unvulcanized rubber sheet 18, is predicted in advance and set as a coefficient. Value.

FIG. 4 is a graph showing the relationship between the slip ratio (%) resulting from the change in the rotation speed of the sheeting roll 10 and the rotation speed (min ⁻¹ ) of the sheeting roll 10. In the present embodiment, as shown in the figure, the change in the slip ratio (%) with respect to the change in the rotational speed (min ⁻¹ ) of the sheeting roll 10 is approximated as a linear change, and a linear expression indicated by the graph is obtained. The inclination was defined as a roll rotation slip coefficient B.

The predicted follow-up rate deriving unit 102 multiplies the roll rotation slip coefficient B and the sheeting roll rotation speed VR1 (min ⁻¹ ) to calculate a prediction value that is a predicted value of the slip ratio (%) according to the rotation speed of the sheeting roll. The slip ratio Sr1 (%) is calculated (see block 202 in FIG. 3).

  Moreover, the gap width slip coefficient C in Formula (5) changes according to the roll gap width W (mm) adjusted. The rate of change of the slip ratio (%), which is the speed ratio between the peripheral speed (mm / min) of the sheeting roll 10 and the delivery speed (mm / min) of the unvulcanized rubber sheet 18, is predicted in advance and set as a coefficient. Value.

  FIG. 5 is a graph showing the relationship between the slip ratio (%) resulting from the change in the adjusted roll gap width W (mm) and the roll gap width W (mm). In this embodiment, as shown in the figure, the change of the slip ratio (%) with respect to the change of the roll gap width W (mm) is approximately regarded as a linear change, and the absolute value of the slope of the linear expression shown in the graph Was the gap width slip coefficient C.

  The gap maximum adjustment width Wmax (mm) is a value indicating the maximum width of the adjustment range in the gap width adjustment of the sheeting rolls 10 and 11.

  The predicted follow-up rate deriving unit 102 multiplies the gap width slip coefficient C by the roll gap width W (mm) measured by the gap width detector 14 to respond to the adjusted roll gap width W (mm). A predicted slip ratio Sr2 (%), which is a predicted value of the slip ratio (%), is calculated (see block 205 in FIG. 3).

  The roll rotation slip coefficient B and the gap width slip coefficient C are values set in advance by an operator or the like, and are stored in the storage unit 106 included in the control device 100 (see FIG. 2).

  Thus, the predicted follow-up rate deriving unit 102 selects or calculates the rubber property follow-up rate A (%) and the predicted slip rate Sr1 (%) based on the state of the variable elements such as the rotational speed of the sheeting roll described above. Based on the predicted slip rate Sr2 (%), the predicted follow-up rate F (%) is derived.

(Example)
An example of the calculation of the reference speed VR2 (min ⁻¹ ) by the reference speed calculation unit 103 is shown below. Table 1 is an example of the contents of the values stored in the storage unit 106.

  The value of the rubber property follow-up rate A (%) shown in Table 1, 99.0 (%) means the peripheral speed of the sheeting roll 10 (theoretical delivery of the unvulcanized rubber sheet 18 by the sheeting roll 10). Speed) Shows that the actual unvulcanized rubber sheet 18 delivery speed is 99.0 (%) with respect to 100.0 (%) (the remaining 1.0% is the loss due to surface slip, etc.) .

The sheeting roll rotational speed VR1 (min ⁻¹ ) calculated by the detection signal from the rotary encoder 13 is 20.0 (min ⁻¹ ), and the roll gap width W (mm) measured by the gap width detector 14 is 30. In the case of 0 (mm), the predicted slip rate SR1 (%) = 1.0% and the predicted slip rate Sr2 (%) = 2.0% based on the above-described equation (5).

  Therefore, based on the formula (5), the predicted follow-up rate F (%) = 99.0% (rubber property follow-up rate A) −1.0% (follow-up rate Sr1) −2.0% (follow-up rate Sr2) = 96.0%.

Then, the value of the reference speed VR2 (min ⁻¹ ) that is the reference speed of the rotation speed of the conveyor motor 21 is based on the formula (3), the reference speed VR2 (min ⁻¹ ) = 20.0 min ⁻¹ (VR1 ) × 2.0 (reference draw ratio Dr) × 96.0% (predicted tracking rate F) = 38.4 (min ⁻¹ ).

The calculated reference speed VR2 (min ⁻¹ ) is then corrected as necessary by the feedback calculation unit 104 to adjust the tension at the time of delivery, and the target speed VR3 (min ⁻¹ ) is calculated. The target speed VR3 (min ⁻¹ ) is converted into a speed command signal by the conversion unit 105 and output to the inverter 43, and the transport speed of the transport conveyor 20 is controlled.

  Thereby, the tension of the unvulcanized rubber sheet 18 delivered from the pair of sheeting rolls 10 and 11 can be kept constant, and the unvulcanized rubber sheet 18 is prevented from being cut or bent, and the unvulcanized rubber sheet 18. Productivity and quality can be improved.

  Note that the method of calculating the predicted follow-up rate F (%) in the present embodiment is an example, and the design can be changed as appropriate. The predicted follow-up rate F (%) is calculated using as a parameter the state of a variable element that causes a change in the speed ratio between the peripheral speed of the sheeting roll 10 and the feed speed of the unvulcanized rubber sheet 18 fed from the sheeting roll 10. Any other calculation method may be used as long as it is.

FIG. 6 is a flowchart showing a process flow of the control device 100 related to the control of the transport speed of the transport conveyor 20. In step S <b> 10, the control device 100 measures the sheeting roll rotational speed VR <b> ¹ (min ⁻¹ ) based on the detection signal from the rotary encoder 13 that is a rotation detector. In step S20, the control device 100 acquires the state of variable elements such as the type of the rubber material 30, the sheeting roll rotation speed VR1 (min ⁻¹ ), the roll gap width W (mm), and the predicted tracking rate F (%). Is derived. Next, in step S30, the control device 100 calculates a reference speed VR2 (min ⁻¹ ) that is a reference value for the rotation speed of the transport conveyor motor 21. Note that the processing of step 20 and step 30 is processing executed by the reference speed calculation unit 103 described above. Then, the control device 100 corrects the reference speed VR2 (min ⁻¹ ) calculated in step 30 by the feedback calculation unit 104 in order to control the tension of the unvulcanized rubber sheet fed from the sheeting rolls 10 and 11. The target speed VR3 (min ⁻¹ ) is calculated (step S40), and the calculated target speed VR3 (min ⁻¹ ) is converted into a speed command to the inverter 43 and output (step S50).

Thus, the control method of the conveyor 20 by the control device 100 is caused by the change in the speed ratio between the rotational speed of the sheeting roll 10 and the delivery speed of the unvulcanized rubber sheet 18 delivered from the sheeting rolls 10 and 11. Is obtained, and a predicted follow-up rate F (%) for predicting the speed ratio is derived based on a preset numerical value corresponding to the variable element that causes the speed ratio to change. Based on the step (step S20), the derived predicted follow-up rate F (%) and the sheeting roll rotational speed VR1 (min ⁻¹ ), the reference speed VR2 (min ⁻ stearyl for controlling the rotational speed of the conveyor motor 21 in response to ¹⁾ calculating a (step 30), the reference speed VR2 (min ^-1 derived) And a flop (step S40 and S50).

  As a modification of the present embodiment, a sensor for measuring the sheet thickness of the unvulcanized rubber sheet 18 fed from the sheeting rolls 10 and 11 instead of the gap width detector 14 may be provided. In this case, the predicted follow-up rate deriving unit 102 replaces the roll gap width W (mm) detected by the gap width detector 14 with the sheet thickness of the unvulcanized rubber sheet 18 as a variable element. %) May be used.

  Furthermore, the determination signal acquired for the predicted tracking rate deriving unit 102 to select the rubber property tracking rate A (%) is not limited to the determination signal from the product number storage unit 101. The determination signal may be a signal directly input from the operation box 40 as long as it is a signal associated with the type of the rubber material 30, or may be a signal input from another control device or the like. Good.

Further, in this embodiment, the roll rotation slip coefficient B and the gap width slip coefficient C are respectively regarded as linear changes in the slip ratio (%) with respect to the change in the rotational speed (min ⁻¹ ) of the sheeting roll 10. However, the present invention is not limited to this. A plurality of coefficients relating to a multidimensional curve graph obtained by analyzing the change in the slip ratio (%) in more detail may be set in advance.

  Further, in the present embodiment, the rubber physical properties based on the three variable elements, that is, the types of the rubber material 30 as the variable elements that cause a change in the speed ratio between the peripheral speed of the sheeting roll 10 and the feed speed of the unvulcanized rubber sheet. Although the rotation speed of the sheeting roll and the roll gap width W are applied, the present invention is not limited to this. The present invention can be applied to any one of the three variable elements, or other variable elements other than the three variable elements. As another variable element, for example, the surrounding environment such as the temperature and humidity at the production site of the unvulcanized rubber sheet 18 and the temperature of the rubber material 30 extruded from the roller head extruder 1 may be measured to be a variable element. .

  Moreover, although the control apparatus 100 in this embodiment is provided with the extruder control part 110 which controls the roller head extruder 1, this is not essential for the control apparatus 100 of this invention. The control device 100 of the present invention can be configured even when the extruder control unit 110 is provided to another control device and connected to the control device 100.

(Action / Effect)
According to the transport conveyor control device according to the present embodiment, the predicted follow-up rate deriving unit 102 adds the unapplied amount to the circumferential speed (mm / min) of the sheeting roll 10 in accordance with the state of a variable element such as the sheeting roll rotation speed. A predicted follow-up rate F (%) that is a predicted value of the speed ratio of the delivery speed (mm / min) of the vulcanized rubber sheet 18 is derived. The predicted follow-up rate F (%) includes three variable elements, i) the rubber physical properties of the rubber material 30 of the unvulcanized rubber sheet 18, ii) the rotational speed of the sheeting roll, and iii) the roll gap width W (mm). Since the tracking rate and slip ratio caused by each variable element are calculated based on the state of each of the three variable elements, the circumference of the sheeting roll 10 is always changed even when the states of these three variable elements change. It becomes a value approximate to the speed ratio between the speed and the delivery speed of the unvulcanized rubber sheet 18.

By applying such a predicted follow-up rate F (%) in the draw control for calculating the reference speed VR2 (min ⁻¹ ) of the transport conveyor motor 21 that drives the transport conveyor 20 from the measured rotational speed of the sheeting roll 10. The unvulcanized rubber sheet, even when the above-mentioned three variable elements change causing the change in the speed ratio between the peripheral speed of the sheeting roll 10 and the delivery speed of the unvulcanized rubber sheet 18 The reference speed VR2 (min ^-1 ) of the conveyor conveyor motor 21 that is always optimal for the delivery speed of 18 can be obtained, and the tension of the unvulcanized rubber sheet 18 delivered from the sheeting roll 10 is kept constant. The unvulcanized rubber sheet 18 can be prevented from being cut or bent by controlling the conveying speed of the conveying conveyor 20.

It is a figure which shows the control apparatus 100, the roller head extruder 1, and the conveyance conveyors 20 and 22. FIG. 3 is a block diagram showing a flow of electrical signals in the control device 100. FIG. It is a block diagram which shows the flow of a process of the reference | standard speed calculation part 103, the prediction tracking rate deriving part 102, and the feedback calculating part 104. It is a graph which shows the relationship between the slip rate (%) of the unvulcanized rubber sheet 18 sent out, and a sheeting roll rotational speed (min <^-1> ). It is a graph which shows the relationship between the slip ratio (%) of the unvulcanized rubber sheet 18 sent out, and roll gap width W (mm). It is a flowchart showing the flow of a process of the control apparatus 100 concerning control of the conveyance speed of the conveyance conveyor.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Roller head extruder, 2 ... Screw, 3 ... Screw motor, 4 ... Base, 5 ... Rubber amount detection switch, 10, 11 ... Sheeting roll, 12 ... Seating roll motor, 13 ... Rotary encoder, 14 ... Gap width detection 15 ... tension sensor, 16 ... dancer roll, 18 ... unvulcanized rubber sheet, 20, 22 ... transport conveyor, 21, 23 ... transport conveyor motor, 26 ... drive roll, 30 ... rubber material, 40 ... operation box, 41-44 ... inverter circuit, 100 ... control device, 101 ... type number storage unit, 102 ... predicted follow-up rate deriving unit, 103 ... reference speed calculation unit, 104 ... feedback calculation unit, 105 ... speed conversion unit, 106 ... storage unit 110 ... Extruder control unit, 150 ... Cooling device

Claims (5)

In a conveyer control device for controlling the conveyance speed of a conveyer that conveys the rubber sheet fed from a pair of sheeting rolls that form a rubber material extruded by an extruder into a belt-shaped rubber sheet,
Among the variable elements related to the setting or operation that change in the molding process of the rubber sheet, a variable that causes a change in the speed ratio between the peripheral speed of the sheeting roll and the feeding speed of the rubber sheet fed from the sheeting roll A rubber property follow-up rate A that is a predicted follow-up rate of the speed ratio due to the rubber physical properties of the rubber material of the rubber sheet, which is a numerical value set in advance corresponding to the element, and a preset value corresponding to the variable element The roll rotation slip coefficient B, which is a coefficient obtained by predicting the rate of change of the speed ratio that changes in accordance with the rotation speed of the sheeting roll, which is the numerical value, and is set in advance corresponding to the variable element. In adjusting the gap width W between the pair of sheeting rolls and the gap width of the pair of sheeting rolls, which is the numerical value. A storage unit for storing a gap width slip coefficient C and the coefficient of in advance predicting a rate of change of the speed ratio which changes according to the gap maximum adjustment width Wmax is a maximum width of integer range,
A rotational speed measuring unit for measuring the rotational speed VR1 of the sheeting roll;
Using the numerical value stored in the storage unit, the rotation speed VR1 of the sheeting roll, the gap width W, and the gap maximum adjustment width Wmax, the predicted follow-up rate F of the speed ratio is calculated based on the following formula 1. A predictive tracking rate deriving unit that performs
Formula 1... F = (A−VR1 × B− (Wmax−W) × C)
Using the predicted follow-up rate F, the rotational speed VR1 of the sheeting roll, and the reference draw ratio Dr, which is the ratio of the radius of the sheeting roll to the peripheral radius from the drive roll center of the conveyor to the conveyor surface, A reference speed calculation unit that calculates a reference speed VR2 serving as a reference for the transfer speed of the transfer conveyor based on the following equation (2);
Formula 2 ... VR2 = VR1 * Dr * F
A feedback calculator that corrects the reference speed and calculates a target speed of the transport speed of the transport conveyor;
A transport conveyor control device that controls a transport speed of the transport conveyor according to the reference speed or the target speed . A plurality of the rubber property follow-up rates A stored in the storage unit are set corresponding to the type of the rubber material,
The predicted tracking rate deriving unit obtains a determination signal associated with the type of rubber material, with the type of rubber material as the state of the variable element, and is stored in the storage unit according to the acquired determination signal. 2. The rubber material follow-up rate A is selected from the plurality of predicted rubber property values, and the predicted follow-up rate F is derived using the selected rubber property follow-up rate A. Conveyor control device. The roll rotation slip coefficient B stored in the storage unit is a change rate of a slip ratio, which is a speed ratio between the circumferential speed of the sheeting roll and the feeding speed of the rubber sheet, with respect to the rotation speed of the sheeting roll. Is a predicted and factorized value,
The conveyance conveyor control device according to claim 1 or 2, wherein the slip ratio is calculated based on the following formula (3 ).
Formula 3 ... slip ratio = (sheeting roll peripheral speed-rubber sheet feed speed) / sheeting roll peripheral speed A rubber shortage signal that is a shortage signal of the rubber material inside the roller head extruder having the sheeting roll, and a retention signal that is a signal that the rubber sheet has accumulated in the cooling device that cools the rubber sheet conveyed by the conveyor. And further comprising a speed control unit for lowering the rotational speed of the sheeting roll based on the transfer conveyor control device according to any one of claims 1 to 3. In a transport conveyor control method for controlling the transport speed of a transport conveyor that transports a rubber sheet fed from a pair of sheeting rolls that form a rubber material extruded by an extruder into a belt-shaped rubber sheet,
Among the variable elements related to the setting or operation that change in the molding process of the rubber sheet, a variable that causes a change in the speed ratio between the peripheral speed of the sheeting roll and the feeding speed of the rubber sheet fed from the sheeting roll A rubber property follow-up rate A that is a predicted follow-up rate of the speed ratio due to the rubber physical properties of the rubber material of the rubber sheet, which is a numerical value set in advance corresponding to the element, and a preset value corresponding to the variable element The roll rotation slip coefficient B, which is a rotation coefficient obtained by previously predicting the change rate of the speed ratio that changes according to the rotation speed of the sheeting roll, which is the numerical value, and the variable element, The gap width W between the pair of sheeting rolls and the gap width adjustment of the pair of sheeting rolls are the numerical values set in advance. Using the gap width slip coefficient C obtained by previously predicting and factoring the rate of change of the speed ratio that changes according to the maximum gap adjustment width Wmax that is the maximum width of the adjustment range at Calculating based on Equation 1 below:
Formula 1... F = (A−VR1 × B− (Wmax−W) × C)
Using the predicted follow-up rate F, the rotational speed VR1 of the sheeting roll, and the reference draw ratio Dr, which is the ratio of the radius of the sheeting roll to the peripheral radius from the drive roll center of the conveyor to the conveyor surface, A step of calculating a reference speed VR2 serving as a reference of the transfer speed of the transfer conveyor based on the following equation 2;
Formula 2 ... VR2 = VR1 * Dr * F
Correcting the reference speed and calculating a target speed of the transport speed of the transport conveyor;
And a step of controlling a transport speed of the transport conveyor according to the reference speed or the target speed .

Images