JPH115247A - Synthetic resin sheet molding system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a plant cost by separating an operating unit for units of a mold, raw material supplying, extruding, cooling roll, take-off roll, cutting and stacking for constituting a facility from a controller and transmitting an operation signal from the operating unit to the controller, thereby improving operability and control accuracy. SOLUTION: Raw material supplied from a raw material supplying unit is plasticized by an extruder, shaped to a planar state by a die, extruded as a sheet, and cooled by a cooling roll unit temperature controlled by a heating cooler. This is taken off to a take-off unit, cut in an arbitrary width length by a take-off cutter, and stuck on a pallet by a stacking unit. Operating units 11 of these units are separated from controllers 14 to 20. The units 11 include display, input units, and a microcomputer, are connected to the controllers 14 to 20 via a cable 12 and connecting unit 13, and an operation signal is transmitted to respective units. Accordingly, since the operating units are all size and each unit has a simple control unit, an installation construction can be easily executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for controlling a synthetic resin sheet molding facility, and contributes to improving the convenience of operation management of the facility and reducing the construction cost of the facility.

[0002]

2. Description of the Related Art Synthetic resin sheet molding equipment is basically composed of a raw material supply device, an extruder for plasticizing the raw material, a mold for shaping the plasticized raw material into a flat shape, and a cooling device for cooling the sheet. It is composed of a roll facility, a cutting device for cutting sheets to an arbitrary width, a stacking device for stacking the cut sheets on a pallet, and the like.

In recent years, in synthetic resin sheet molding equipment,
Automatic control has been largely incorporated, and in some cases, interlocking between multiple devices has been performed.The number of control components inside the operation and control panel has increased significantly, and the size of the housing has tended to increase. It is impossible to provide a control panel as a machine side panel of each device and integrate an operation panel, a control panel, and a device main body.

As a system in which the operation / control section and the equipment main body are separated, for example, as shown in FIG. 4, a device necessary for controlling each device, for example, a measuring device is controlled under a small and high-speed programmable sequencer. Operating / control unit 21 with a hardware, a temperature controller, an NC controller for a servomotor, etc. attached thereto, and housed in a housing separate from the device main body, and using the front surface of the housing as an operation surface. ~ 27
Is provided for each device, and there is a system connected to the device body.

However, hundreds to thousands of signal lines and power lines are laid between the control panel, the operation panel, and the device main body. In such a system, the operation / control section is connected to each device main body. Because of the separation, the wiring that had been connected once for the test run at the equipment manufacturer must be disassembled once for transportation, reconnected at the installation site, and further inspected, which requires cost. There is a problem that it is very disadvantageous. This problem is the same when the layout of the equipment is changed. In addition, since an operation / control unit is provided for each device, a plurality of operation surfaces are dispersed and there is a problem that operability is poor.

On the other hand, in order to improve operability, a system in which a control unit and an operation unit are housed in a single centralized console, for example, as shown in FIG. 5, a high-speed computer for process control having a display and a keyboard There is a system provided with a control unit 32 that performs operation control collectively based on a command of an operation unit 31 configured by an operation unit.

However, the control unit 32 and each device main body must be connected by a power line and a signal line, and the above-mentioned problems in changing the layout of the equipment cannot be solved. Since the weighing controller and the cutting machine controller are housed in a single large program, there is also a problem that a partial waiting time cannot be allocated during a series of control operations, thereby impairing weighing accuracy and cutting accuracy.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a synthetic resin sheet molding system capable of improving operability and control accuracy and reducing plant cost.

[0009]

In order to solve the above-mentioned problems, the present inventors have proposed a method of controlling a control panel or a control panel at any cycle or speed while a synthetic resin sheet molding facility is operating. And it was analyzed whether it was moving back and forth between the apparatus main body. Table 1 shows the results.

[0010]

[Table 1]

The signal is an operation signal between the operation panel and the control panel,
Although they are classified into control signals between the control panel and the apparatus main body, as shown in Table 1, operation signals are not always exchanged (level I), but most of the control signals are Signals requiring high speed and high frequency (level I
I) and a two-way signal for which feedback or answer back is performed to ensure automatic control.

Also, 50% to 90% of the signal lines are used for transmitting control signals, that is, wired between the control panel and the apparatus main body. Furthermore, the power line is also basically wired between the control panel and the apparatus body.

From the above analysis, by separating the operation panel and the control panel and installing the control panel in the main body of the apparatus, the wiring can be greatly reduced, the control accuracy can be improved, and the operation panel is further integrated. As a result, the present inventors have found that the degree of freedom in layout can be increased and the operability can be improved.

That is, the present invention provides at least a raw material supply device,
In a synthetic resin sheet molding facility having an extrusion device, a mold, a cooling roll device, a take-up roll device, a cutting device, and a stacking device, an operation unit and a control unit of each device are separated,
An operation signal is transmitted from an operation unit to a control unit, which is a synthetic resin sheet molding system.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

The synthetic resin sheet molding equipment that can be used in the system of the present invention includes at least a raw material supply device, an extrusion device,
It is not particularly limited as long as it has a mold, a cooling roll device, a take-up roll device, a cutting device, and a stacking device, and facilities usually used for extrusion molding of an acrylic resin sheet or a polycarbonate resin sheet can be used.

FIG. 1 shows an example of a synthetic resin sheet molding facility that can be used in the system of the present invention. The raw material supplied from the raw material supply device 1 is plasticized in the extrusion device 2, shaped into a flat shape by a T-die 3 as a mold, and extruded as a sheet 9. Then, the sheet 9 is cooled by the cooling roll device 4 whose temperature is controlled by the heating and cooling device 5, taken up by the take-off roll device 6, cut by the cutting device 7 into an arbitrary width, and palletized by the stacking device 8. Stacked on top.

FIG. 2 is a schematic explanatory diagram of the system of the present invention. As shown in FIG. 2, the operation unit and the control unit of each device are separated, and the operation unit 11 is integrated and each control unit 14
To 20 are transmitted via the cable 12.

The operation unit 11 includes a display device, an input device, and a small computer for converting input information into operation signals for the respective devices.

As the display device, a display mechanism combining a lamp such as a CRT, a liquid crystal, a plasma display, an LED and a picture and the like can be used. As an input device,
In addition to a keyboard, a mouse, a pen-type pointer, a push button, a toggle switch, and the like, a device that can externally input data by a communication function can be used.

The operation unit 11 and the control units 14 to 20 provided in each device are connected by a cable 12 and a connector 13 to form a LAN (local area network). Operation signals are transmitted to the units 14 to 20. As the cable 12, a coaxial cable, an optical fiber, a twisted pair wire, or the like can be used, but a coaxial cable or an optical fiber is preferable because of its resistance to disturbance such as noise in a factory.

The control units 14 to 20 are housed in a small housing as a machine side panel of each device. However, if necessary, the control units of a plurality of devices may be combined into a single control panel as long as the control panel can be accommodated. These housings include communication devices for receiving operation signals, processing devices for processing the received operation signals, and the minimum control devices necessary for efficiently controlling the role of each device. For example, a servo amplifier and an NC controller of a servomotor, an operation board for digital control, a thyristor, a solid state relay for opening and closing large power, and the like are incorporated.

Examples of the processing device include a small sequence control device capable of high-speed arithmetic processing, a process computer, a control device having a circuit for automatically controlling equipment directly without using software, a programmable sequencer, a machine-machine interface. Can be used.

The control section 14 controls the raw material supply device 1 and automatically controls a blower, an autoloader, a measuring device, a mixer and the like for transporting the raw material. FIG. 3 shows an example of the control in the control unit 14. As shown in FIG. 3, a virgin raw material (V raw material) and a recycled raw material (R raw material) are weighed in accordance with the mixing ratio sent as an operation signal from the operation unit 11, and the raw materials are put into the extruder 2.

The control unit 15 controls the extruder 2, and automatically controls the rotation speed of the main motor, feedback of the extrusion pressure, and the like.

The control unit 16 controls the temperature from the extruder 2 to the T-die 3.

The control unit 17 controls the cooling roll device 4 and the take-up roll device 6, and performs roll speed control, gap control, and the like.

The control section 18 controls the heating and cooling of the cooling roll device 4, and controls the heating and cooling of the cooling and heating device 5.
Performs automatic control of servo valves and pumps.

The control unit 19 controls the cutting device 7, and measures the width and length of the sheet 9, controls the cutting operation, and controls the position of the saw tooth and the number of rotations.

The control unit 20 controls the stacking device 8 and performs positioning of a pallet, counting of the number of products, control of a conveyor and a manipulator for transferring products.

According to the present system, the operation unit of the synthetic resin sheet molding equipment is extremely miniaturized, and the individual devices are provided with a simple and simple control unit as a machine side panel. Therefore, the work in the installation work of the device is completed by connecting the power lines and routing the cables, and it is not necessary to route hundreds to thousands of signal lines as in the related art. Moreover, once the machine maker performs a trial run, it is not necessary to check the operation after the operation.

Therefore, the degree of freedom in the layout of the apparatus is increased, and the arrangement can be performed with priority given to the operability of the operating personnel, thereby improving the work efficiency. Since the control scale can be made compact and general-purpose equipment can be used, the costs for installing the equipment itself and the equipment can be reduced, and the total equipment cost of the synthetic resin sheet molding equipment can be reduced. Becomes

In addition, since the small-scale system dedicated to each of the raw material measuring system and the cutting machine system independently performs the control operation, the measuring accuracy and the cutting accuracy can be improved without being affected by other systems. Can be done.

[0034]

As described above, according to the present invention, the operability and control accuracy of the synthetic resin sheet molding equipment can be improved, and the plant cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of a synthetic resin sheet molding facility that can be used in the system of the present invention.

FIG. 2 is a schematic explanatory diagram of the system of the present invention.

FIG. 3 is a flowchart illustrating control of a raw material supply device.

FIG. 4 is a schematic explanatory diagram of a conventional system.

FIG. 5 is a schematic explanatory diagram of a conventional system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Raw material supply apparatus 2 Extrusion apparatus 3 T die 4 Cooling roll apparatus 5 Heating / cooling apparatus 6 Take-up roll apparatus 7 Cutting apparatus 8 Stacking apparatus 9 Sheet 11 Operation part 12 Cable 13 Connector 14-20 Control part

Claims (6)

[Claims] At least a raw material supply device, an extrusion device, a mold, a cooling roll device, a take-up roll device, a cutting device,
In a synthetic resin sheet molding facility having a stacking device, an operation unit and a control unit of each device are separated, and an operation signal is transmitted from the operation unit to the control unit. 2. The synthetic resin sheet molding system according to claim 1, wherein the control section is housed in a machine side panel of an apparatus main body to be controlled. 3. The synthetic resin sheet molding system according to claim 1, wherein the operation unit and the control unit are connected by a cable to form a network. 4. The synthetic resin sheet molding system according to claim 3, wherein the cable is a coaxial cable or an optical fiber. 5. The synthetic resin sheet molding system according to claim 1, wherein the operation unit is a small computer having at least a display device and an input device. 6. The synthetic resin according to claim 1, wherein the control unit includes a sequence control device, a process computer, or a control device having a circuit for automatically controlling the device directly without using software. Sheet forming system.