JPH054208B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a resin supply device for an extruder.

[Technical background of the invention]

A resin supply device for an extruder for coating an insulating layer, sheath, etc. of an electric wire is constructed as shown in FIG. That is, the lower end of the main hopper 2 is connected to the conductor inlet side of the extruder housing 1, and the service hopper 3 is connected to the upper surface plate 2a of the main hopper 2.
is installed. The service hopper 3 extends into the main hopper and has a valve stopper 3a whose tip is cut off diagonally. The other end of the pipe 4 communicating with the upper part of the service hopper 3 is buried in the resin pellet 6 in the resin pallet 5. Further, the service hopper 3 is connected to an intake fan 8 through a pipe 7.

Further, a second service hopper 9 is attached to the main hopper 2, and a crusher 1 is attached to this hopper.
A pipe 11 from 0 is connected. In the figure, 1
2 and 13 indicate level meters.

In the above configuration, the resin is supplied as follows. First, the intake fan 8 is activated in response to a work start command. As a result, when the inside of the service hopper 3 becomes negative pressure, the resin pellets 6 in the resin pallet 5 are sucked into the service hopper 3 through the pipe 4. The suction fan 8 is controlled by a timer and is operated for a period of time necessary to suck an appropriate amount of resin pellets into the service hopper 3. When the fan 8 is stopped, air enters the service hopper 3 from the atmosphere, and the service hopper 3
When the pressure in the main hopper 2 and the main hopper 2 are balanced, a valve (not shown) between the two opens, and the service hopper 3
The pellets inside fall into the main hopper 2. Next, the valve is closed and the fan 8 is restarted to fill the main hopper 2 with pellets via the service hopper 3 in the same manner as described above. This operation is automatically repeated until the pile of pellets 14 accumulated in the main hopper 2 hits the stopper 3a and the valve cannot be closed.

When the extruder is operated and the number of pellets in the main hopper 2 decreases, and the surface of the pile of pellets falls to the level gauge 12 at the top, the main hopper 2 is replenished with pellets in the same manner as described above. If pellets are not sucked into the service hopper 3 for some reason, the service hopper does not have the ability to detect this, so an alarm is issued when the surface of the pellet pile drops to the level indicated by the level meter 13 at the bottom. The operator takes appropriate action based on this alarm.

The pulverizer 10 is used to crush the dough waste generated by dry kneading that is performed at the start of operation until the dough becomes good, send it to the hopper 9, and finally collect it in the main hopper 2.

[Problems with background technology]

In the resin supply device having the above configuration, it is not possible to accurately know the amount of resin supplied. This is inconvenient, since it is important to accurately know the amount of resin supplied for cost control and work management purposes.

[Purpose of the invention]

The present invention was made based on the above-mentioned circumstances, and an object of the present invention is to obtain a resin supply device that can accurately determine the amount of resin supplied.

[Summary of the Invention] The resin supply device of the present invention includes a main hopper communicating with an extruder housing, first and second service hoppers communicating with the main hopper, and the first service hopper communicating with the main hopper.
an intake fan whose intake port communicates with the service hopper; a resin pallet that communicates with the first service hopper and accommodates resin pellets; and a resin pallet that is blown out when the resin is idle and is pulverized and supplied to the second service hopper. Starting and stopping of the crusher and the intake fan are automatically repeated to cause a predetermined amount of resin pellets to fall and be stored in the main hopper by alternating the negative pressure in the first service hopper and the atmospheric pressure. In the resin supply device, the first and second
a service hopper is installed mechanically separated from the main hopper, and the main hopper is installed mechanically separated from the extruder housing, and first and second A load cell is provided, and a table scale is provided for measuring the discharged resin to be supplied to the crusher, and the first and second
A conversion means is provided to digitize the measured output of the load cell and the table scale, and the cumulative value of the second load cell output at the time of starting product picking is _W1 , and the cumulative value of the second load cell output at the time of stopping extrusion is determined.
W ₂ is the output of the first load cell at the time of starting product picking, W ₃ is the output of the first load cell at the time of stopping extrusion, W ₄ is the cumulative output of the platform scale.
W _B , W ₁ − W ₃ , that is, the idle amount is W _A , and the CPU
It is characterized in that the amount of adhesion W _D to the cable etc. is determined by the following formula W _D = (W ₂ - W ₄ ) - W _A + W _B.

[Embodiments of the invention]

FIG. 2, in which the same parts as in FIG. 1 are given the same reference numerals, shows an embodiment of the present invention. In the present invention,
The service hoppers 3 and 9 and the main hopper 2 are mechanically separated, and the same applies to the main hopper 2 and the housing 1. That is, the two are communicated by a flexible joint or the like. In addition, main hopper 2, service hopper 3
are supported on a fixed member via load cells 14 and 15, respectively. Load cell 14,1
5. Platform scale 16 installed near the crusher 10
The output is converted into a digital signal by the converter 17 and sent to the CPU 18.

In the apparatus of the present invention having the above structure, resin pellets are supplied to the main hopper 2 in the same manner as in the conventional example shown in FIG. However, when the fan 8 is started, a work start command A is input to the CPU 18. When the fan 8 is stopped by the timer, the output of the load cell 15, that is, the weight of the resin pellets in the service hopper 3, is converted into a digital signal by the converter 17 and sent to the CPU 18. As mentioned above, the suction into the service hopper 3 and the dropping into the main hopper 2 are automatically repeated, but the weight of the resin pellets in the service tank 3 is sent to the CPU 18 each time, and the weight of the resin pellets is added up and totaled. is required. On the other hand, the pellet weight in the main hopper 2, ie, the output of the load cell 14, is also digitized and sent to the CPU 18. CPU18
stops the supply of resin when the output of the load cell 14 reaches the set value.

When the extruder is started and the resin pellets decrease and the surface of the pile drops to the level gauge 12 at the top,
The fan 8 is activated in the same way as in the conventional case.
Also, the surface of the pellet pile is at the bottom of the level meter 13.
Similarly, an alarm will be issued if the temperature drops to a certain level. By the way, just to be sure, these are
This is done by another sequence separate from the CPU.

In addition, the waste generated during dry kneading is on the platform scale 16.
The output is also digitized and sent to the CPU 18 by the platform scale reading command B.
Accumulated. After being weighed using a table scale, it is crushed and put into the main hopper 2.

After the empty kneading process is completed, a clock measure is started to take out the product, that is, to start extrusion coating onto conductors, etc., but the counter of this clock measure is reset. The reset command at the time of this reset, that is, the measuring start signal C, is taken into the CPU, and the cumulative amount of the output of the load cell 14 and the output of the load cell 15 at that time is stored in the CPU.

When the extruder stops, the stop signal D is sent to the CPU
Load cell 14 at that point
The cumulative output of the output of the load cell 15 and the output of the load cell 15 are determined.

Let W ₁ be the cumulative output of the load cell 15 at the time of starting the product taking, W ₂ be the cumulative output of the load cell 15 when the extrusion is stopped, W ₃ be the output of the load cell 14 at the time of starting the product taking, and W ₄ be the output when the extrusion is stopped. For example, W ₁ − W ₃ = W _A However, W _A is the empty amount W _A − W _B = W _C However, W _B is the cumulative amount on the platform scale W _C is the amount of scrap (W ₂ − W ₄ ) − W _A +W _B = W _D However, W _D can be used as the cable adhesion amount to determine the coated resin amount.

〔Effect of the invention〕

As is clear from the above, according to the present invention, the amount of resin pellets supplied can be accurately determined, and the amount attached to cables, etc. can also be determined from this, which is advantageous in terms of cost control and work management.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of an example of a conventional supply device;
The figure is a schematic diagram of one embodiment of the present invention. 1... Extruder housing, 2... Main hopper, 3... Service hopper, 5... Resin pallet, 8... Intake fan, 9... Service hopper,
10...Crusher, 12,13...Level meter, 1
4, 15...load cell, 16...scale,
17...Converter, 18...CPU.

Claims (1)

[Claims] A main hopper communicating with the extruder housing;
A first and second service hopper communicating with the main hopper, an intake fan having an intake port communicating with the first service hopper, a resin pallet communicating with the first service hopper containing resin pellets, a pulverizer that pulverizes the discharged resin and supplies it to the second service hopper; and a pulverizer that automatically repeats starting and stopping of the intake fan to alternate between negative pressure and atmospheric pressure in the first service hopper. Accordingly, in the resin supply device which allows a predetermined amount of resin pellets to fall and be stored in the main hopper, the first and second service hoppers are installed mechanically separated from the main hopper, and the main hopper is connected to the extruder. A stand that is installed mechanically separate from the housing and that is provided with first and second load cells that measure the weight of the main hopper and the first service hopper, and further that weighs the empty resin to be supplied to the crusher. A scale is provided, and a conversion means is provided to digitize the measurement outputs of the first and second load cells and the platform scale, and the cumulative value of the output of the second load cell at the time of starting product taking is W ₁ and the cumulative value of the output of the second load cell at the time of stopping extrusion. The cumulative value of the output of the second load cell is W ₂ , the output of the first load cell at the time of starting product picking is W ₃ , the output of the first load cell at the time of stopping extrusion is W ₄ , and the cumulative value of the output of the platform scale Assuming that the amount is W _B and W ₁ − W ₃ , that is, the empty amount is W _A , the CPU calculates the adhesion amount W _D to the cable etc. using the following formula W _D = (W ₂ − W ₄ ) − W _A + W _B. A resin supply device characterized by the following.