JPH0613190B2 - Extrusion device with automatic take-up control - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an extrusion molding apparatus of a type in which raw materials are melted in a heating cylinder and extruded from a die with a screw, which is capable of automatic take-up control.

(Prior art and its problems) The conventional device of this kind is the amount of extrusion of the machine. A veteran worker with a high skill set the take-up speed. Therefore, the following problems existed.

(1). Extrusion amount of machine. It takes time to turn the workers into craftsmen because of the highly skilled veterans who set the pick-up speed.

(2). Since the workers change in three shifts, the adjustments will vary depending on the person.

(3). 4 ~ to make adjustments to make the product as specified
Since it takes 8 hours, there are many losses.

(Four). Since it is an analog system, there are individual differences among workers, and the same adjustment cannot be done again.

(Five). It is difficult to always check because one person has multiple machines to work.

(6). I don't know when Ami-jame begins to occur.

(7). It is not possible to respond immediately because the change in the extrusion amount is unknown.

(8). When did the screws start to wear,
I don't know when it will have to be replaced.

(9). It is difficult to understand the temperature change.

(Ten). 2 tank type. When it comes to a three-layer type, it becomes difficult to set very much.

(Problems to be Solved by the Invention) Since the above-mentioned conventional manual operation method by an experienced worker has the above-mentioned problems, the product must be thick as a result, As a result, the use of raw materials has increased, and the operating time of the machine has increased, which has been a drawback.

Therefore, in the present invention, the extrusion amount. The pick-up speed is digitized so that any worker can make the same settings. In addition, according to the present invention, the following advantages can be obtained.

(B). There will be no variation in products due to workers.

(B). The product thickness can be made uniform, and it is 5
Although it was set to be 10% to 10% higher, the required set value will suffice.

(C). It takes less than a minute to set up a product as specified, so there is less loss.

(D). The amount of extrusion changes depending on the change in the jam, so you can know the appropriate timing for changing the web.

(E). Since the microcomputer constantly controls changes in the extrusion amount, the take-up speed is always automatically corrected.

(F). Even if the standard varies depending on the product, it can be easily set with the digital switch and the take-up speed is automatically corrected.

(G). Even if an abnormality occurs, the abnormality display will appear.

(H). Manual operation is possible even in the case of equipment failure.

(Re). Finished weight is less than 1%.

(Nu). There is almost no product loss.

(Means for Solving Problems) Therefore, in order to obtain the above advantages, according to the present invention, a measuring kettle, a raw material opening / closing cylinder, and an automatic take-up speed control panel are arranged on the way of feeding the raw material to the heating cylinder. , The raw material open / close cylinder is turned on with the upper limit setting value and the lower limit setting value of the measuring kettle. While turning it off, measure from the moment when the upper limit set value of the measuring hook is turned on to when it is turned off to the moment when the lower limit set value is turned on. That is, the time for consuming 1 kg of unit raw material is precisely measured. The take-off speed is calculated from this.

(Specific Example) An example of the present invention will be described below with reference to the drawings.

The raw material 1 moves into the measuring kettle 2 while the raw material opening / closing cylinder is open. The raw material collected in the measuring kettle 2 gradually falls into the heating cylinder 4, and is heated and melted while being pushed toward the net 7 by the screw 5 driven by the motor 6. The molten raw material reaching the net 7 passes through the net while being regulated in flow, is extruded from the die 9 through the adapter 8, and is taken up by the pinch roller 10 at the tip thereof, and the width tube regulator 11 is set. This kind of extrusion, through which the product comes out. The relationship between the raw material opening / closing cylinder 3 and the measuring kettle 2 in the take-up process is as follows. The weighing vessel 2 determines two weighing settings, an upper limit value (for example, 5 kg) and a lower limit value (for example, 4 kg), and when the lower limit value is reached, the opening / closing cylinder 3 is turned on to open the raw material into the weighing vessel 2, and the upper limit is set. When the value is reached, the open / close cylinder 3 is turned off to close the raw material intake. Then, the period from the moment when the upper limit set value of the measuring hook is turned on to the moment when it is turned off to the moment when the lower limit set value is turned on is measured. That is, the time for consuming 1 kg of unit raw material is precisely measured. The value is input to the CPU in the automatic take-up speed control panel 12. The specific gravity and tolerance of the raw material are set in advance on the speed control board 12.

Therefore, the extrusion amount and the take-up speed are calculated in the value increasing CPU as follows, and the take-up is controlled. In addition, it is also possible to display an alarm such as when the material runs out. These will be described in some detail below.

(a). Method of calculating extrusion rate ◎ Calculated by measuring the time to consume the unit raw material.

◎ Using a measuring kettle 2, 1 kg of raw material is gradually fed by an air cylinder. If an upper limit and a lower limit are provided in the measuring kettle 2 and the lower limit is turned on, the air cylinder operates to supply the raw material, and one second after the upper limit is turned on, the air cylinder stops. The weighing kettle 2 may be set to have an upper limit of 5 kg and a lower limit of 4 kg, and the air cylinder opens and closes within 1 kg.
(If the difference is 1 kg, it is sufficient.) The measurement operates at the moment when the upper limit of the measuring hook 2 is turned on and then off, and stops when the lower limit is turned on. If you accurately measure the time during this period, you can see how many seconds it takes for 1 kg of raw material. Enter this time in the data (time can be understood to 1/10 seconds).

Example 1.1 If the raw material of 1 kg lasts for 100 seconds, the extrusion amount is
* 1 hour = 3600 (s) Because T = 100s As described above, the extrusion charge can be calculated if the accurate time is known.

(b). The take-off speed can be calculated if the extrusion amount is found by the method (a) of calculating the take-up speed.

In the above formula, 2 × 60 is a constant, so put it in the data.

Others are variables and must be set. Therefore, the take-up speed is automatically displayed by providing a setting digital switch on the operation panel and changing this number.

◎ Example of how to determine the set value 2. Width = 450 mm, thickness = 0.022 mm Specific gravity = 0.955, tolerance = 0.95 Set value = 450 × 0.022 × 0.955 × 0.95 = 8.98 Example 3. Width = 900 mm, thickness = 0.15 Specific gravity = 0.955, tolerance = 0.95 Setting value = 900 × 0.15 × 0.955 × 0.95 = 122.47

Therefore, for example, the extrusion amount of Example 1 and the set value of Example 2 are stored in the CPU.
When set to, and calculated according to the above formula, the drawing speed (m / mi
n) is calculated as 33.3 and displayed on the display.

The take-up speed is calculated as described above. If this value is input to the take-up motor, automatic take-up control can be performed. In addition, to make this device easier to use,
The following displays are displayed.

(c). Method of displaying the logical take-up speed The logical take-up speed is displayed in the first measurement when the extruder enters the high speed operation and the measurement operation button is pressed, but this is done by the operator using the operation panel 13 in Fig. 3. This is to be used as a guide for manual adjustment. After this, after measuring 5 times, the average value of 5 times is displayed, and the average value of every 5 times is displayed and updated. This is because the reaction is fast if it is performed once, but becomes unstable due to fluctuations in the extrusion rate, measurement errors, and the like.

(d). Automatic correction method of take-up speed The actual take-up speed is input to the CPU at intervals of 5 seconds by the tachometer. In this method, the input motor value is compared with the theoretical take-up speed value to shift the take-up motor.

± 0.2 of the theoretical take-off speed as it changes
The upper and lower limits of (m / min) are set inside the CPU (automatically)
Correct the take-off speed so that it is within that range.

Example 4. If the theoretical take-up speed (m / min) is displayed as 33.3, And the upper and lower limits are automatically set, and the take-up speed is 33.1 to 33.
Change the speed of the pinch roll motor so that it enters between 5 (m / min).

Automatic correction starts automatic operation after the second measurement.

(e). Comparison value setting Comparison value setting is to compare theoretical take-up speed (average value every 5 times of measurement). The average value of theoretical take-up speed is compared with the next average value. If it is larger than the comparison set value, it is an abnormal signal. Give out.

Example 5. If the comparison value setting is 1.3 (m / min), As described above, it is possible to control so that the difference between the theoretical take-up speeds averaged every five measurements is within the numerical value set as the comparison value. Since the take-up speed is automatically corrected, there is no problem as the take-up speed, but the width is defective when abruptly changed. or,
If there is a sudden change, it seems that there is a mechanical abnormality,
This is because the extraction amount changes depending on the heater and cooling relationships.

(f). Raw material out alarm This is an alarm when the raw material is not supplied within 10 seconds after the lower limit of the measuring kettle 2 is turned on. When the raw material is supplied, it goes out automatically.

(g). Air cylinder This automatically opens and closes in response to the signal from the weighing kettle 2 when the power is turned on.

In the case of failure of the measuring hook 2, it is opened by turning on the manual switch of the solenoid valve.

(h). Manual push button SW This is used when the take-up speed is adjusted manually, and can be used independently of the others when the power is turned on. (Can also be used during automatic driving) (i). Measurement operation, reset push button SW This is ready when the extruder is in high-speed operation and the measurement can be performed by pressing the operation button. The reset push button has an abnormal comparison, width,
Used when changing thickness, setting, etc. If you press it, the previous memory will be all zero. If the extruder stops, it will work automatically.

The above is programmed, and when the power is turned on, it automatically operates, and the various display lamps in FIG. 2 display. Also, as an additional function, it becomes possible to measure the extrusion rate of the machine in units of one day and one month. If you check the meter every day, you can calculate the machine operation rate, loss rate, and optimal network replacement time.

(Effect of the present invention) As can be seen from the above, according to the present invention, the time during which the raw material is taken in is set to the ON / OFF state of the open / close cylinder. Since the take-off speed is measured based on the off-time and the take-up speed is controlled based on this measured value, the automatic take-out control of the extrusion molding can be performed accurately and easily.

[Brief description of drawings]

FIG. 1 is an extrusion molding apparatus capable of automatic take-up control according to an embodiment of the present invention, FIG. 2 is an enlarged view of an automatic take-up speed control panel which is a central control unit of the above apparatus, and FIG. 3 is an enlarged operation panel. It is a figure. 1: Raw material, 2: Measuring kettle, 3: Raw material opening / closing cylinder, 4:
Heating cylinder, 5: screw, 6: motor, 7: net, 8: adapter, 9: die, 10: pinch roller,
11: Width tube regulator, 12: Automatic take-up speed control panel, 13: Operation panel, 14: Take-up speed display section, 15: Extrusion amount display section, 16: Thickness width setting section.

Claims (1)

[Claims] 1. A heating cylinder into which a raw material is fed, a screw rotatably housed in the heating cylinder, a motor for rotating the screw, and a molten raw material heated in the heating cylinder for straightening. Heat the raw material in an extrusion molding device that consists of an adapter feeding the adapter, a die provided on the output side of the adapter, a pinch roller that pulls the product extruded from the die, and a width tube regulator that controls the width of the product. A weighing vessel that weighs the raw material while sending it to the cylinder, and turns on when the weighing vessel measures the lower limit set value on the raw material intake side of the weighing vessel and turns off when the weighing vessel measures the upper limit set value. From the moment when the raw material open / close cylinder and the upper limit set value of the measuring kettle turn on and then off,
Precisely measure the unit material consumption time until the moment when the lower limit setting value turns on, calculate the extrusion amount from this value, calculate the take-up speed from this and the preset cross-sectional value of the product, An extrusion molding apparatus capable of automatic take-up control, which comprises an automatic take-up speed control panel for giving a drive signal to a drive motor of the pinch roller.