JP3437401B2 - Operation method and operation control device for resin kneading and granulating device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation method and an operation control device of a resin kneading and granulating apparatus equipped with a dual type screen changer.

[0002]

2 to 5 which are explanatory views of the present invention regarding an example of the structure and operation of the above-mentioned resin kneading and granulating apparatus.
Will be described with reference to. In this apparatus, the molten resin melted and kneaded by the kneader 1 shown in FIG. 2 is raised to a predetermined pressure by the gear pump 2 and supplied to the pelletizer 5 through the screen changer 3 and the die plate 4.

As shown in FIG. 3, the pelletizer 5 cuts the molten resin extruded through the die nozzles 4a formed in the die plate 4 into resin pellets 15 ... Together with this, it is configured to be carried out from above the water chamber 12. The screen changer 3 has built-in screens 8 and 8 for filtering impurities contained in the molten resin, and these are slide bars slidable in the directions intersecting with the branch flow passages 7a and 7a in the changer body 6. It is assembled and held on 10 and 10, respectively.

As shown in FIG. 4, each slide bar 10 has a screen position where the screen 8 is located inside the changer body 6, and the slide bar 10 on the upper stage side in FIG. , Screen 8
Is configured to be slid by a hydraulic cylinder 20 between a screen exchange position in which is located outside the changer body 6. When the screen is replaced at the screen replacement position, the resin flow path on the side located at the screen replacement position is blocked by the slide bar 10, but the other slide bar is located at the screen position. The molten resin is continuously supplied, which allows the screen to be replaced without stopping the operation.

Incidentally, the hydraulic circuit for supplying pressure oil to the hydraulic cylinders 20 has conventionally been constructed by providing a hydraulic pump having a relatively small discharge capacity. That is, the sliding operation of the slide bar 10 at the time of screen replacement as described above is configured to occur at a relatively low speed, thereby ensuring the safety of the operator in the screen replacement work. .

On the other hand, in the above apparatus, when the operation is stopped, the resin remaining on the die plate 4 and the like is solidified, and this is deteriorated by the heat of the die plate 4 and the like. Therefore, when the operation is restarted, first, the residual resin is extruded and removed, and the die nozzles 4a ... Are pierced (cleaning operation) or the raw material resin is supplied to the kneading machine 1 to extrude the molten resin from the die nozzle. Then, the work of confirming that the resin is uniformly extruded from each die nozzle 4a (strand work), and then the work of stopping the supply of the raw material resin to the kneading machine 1 and cleaning the surface of the die plate 4 again. Done. Although these operations can be performed by opening the window of the water chamber 12 and through this window, normally, as shown in FIG. 3, the pelletizer 5 is mounted on the carriage 16 from the joint surface with the die plate 4. It is performed by moving and separating by.

After the above work is completed, conventionally, the operation is started by the following procedure. The pelletizer 5 is connected to the die plate 4. The supply of the raw material resin to the kneading machine 1 is restarted. The driving of the rotary blade 13 is started.

The rotary blade 13 is advanced to the die plate 4 side, and the supply of the cooling water PCW to the water chamber 12 is started. However, with respect to, so that the timing of extruding the resin from the die nozzle and the timing of
Adjust each timing.

[0009]

However, in the above-mentioned conventional resin kneading and granulating apparatus, during the period between and after finishing the above-mentioned strand work at the start of operation,
Since the resin between the gear pump and the die drips from the die nozzle, the dripping resin winds around the rotary blade at the time of start, often causing a start failure.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to operate a resin kneading and granulating apparatus capable of preventing the occurrence of trouble at the start of operation with a simpler structure. A method and an operation control device are provided.

[0011]

In order to achieve the above object, a method for operating a resin kneading and granulating apparatus according to claim 1 of the present invention is to use a rotary blade for a molten resin extruded through a die nozzle formed in a die plate. A method for operating a resin kneading and granulating apparatus, comprising: a pelletizer for cutting and cooling with a die; and a dual-type screen changer in which a screen for filtering molten resin supplied to a die nozzle is provided on each of a pair of slide members. After completing the stranding work to confirm the extruded state of the molten resin from the die nozzle at the time, slide both of the pair of slide members to the screen replacement position where the screen is located outside the screen changer body and blocks the resin flow path. With the flow of molten resin stopped inside the main body of the screen changer, It is close to Lee plate, then
It is characterized in that the slide member is returned to the screen position where the screen is located on the resin flow path, and the supply of the molten resin to the die nozzle is started.

According to the above method, the flow of the molten resin is stopped in the main body of the screen changer until the rotary blade is brought close to the die plate and the production is started after the strand work is completed. This reduces the amount of dripping resin, which enables smooth start-up without resin wrapping around the rotary blade in the pelletizer at the start of manufacturing.

That is, in the above description, by sliding both of the pair of slide members in the screen changer to the screen replacement position at the time of starting operation, these functions as a valve for closing the resin flow path. It is not necessary to separately provide a dedicated member for opening and closing the passage and its drive mechanism. Therefore, the occurrence of trouble at the start of operation can be suppressed without complicating the overall configuration.

The operation control device of the resin kneading and granulating apparatus according to claim 2 is an operation control device of the resin kneading and granulating apparatus, which comprises a dual type screen changer in which a screen for filtering the molten resin is provided on each of a pair of slide members. Then, a hydraulic cylinder for driving each of the pair of slide members is connected to a low speed oil supply line that causes the slide member to slide at a low speed and a high speed oil supply line that causes a high speed, and It is characterized in that high-low speed switching means for selectively switching the supply of pressure oil through these lines is provided.

According to such a device configuration, when the screen is replaced during the steady operation, the pressure oil is supplied to the hydraulic cylinder through the low speed oil supply line, and the slide member is moved at a low speed to replace the screen. The safety of the worker who hits is secured as in the conventional case. Then, when the operation of starting the production of resin pellets by returning both slide members from the screen replacement position to the screen position at the start of operation, by supplying pressure oil to the hydraulic cylinder through the high speed oil supply line, When the slide member is moved at a high speed, the molten resin in the pressurized state, which has been stopped in the screen ganger until then, is supplied all at once to the die nozzle. As a result, the clogging of the nozzle is reduced, which can further suppress the occurrence of troubles at the start of operation.

The operation control device of the resin kneading and granulating apparatus according to a third aspect is characterized in that the high speed oil supply line is provided with an accumulator for temporarily storing the pressure oil from the hydraulic pump. With this configuration, when pressure oil is supplied to the hydraulic cylinder through the high-speed oil supply line, the pressure oil that has been stored in the accumulator until then is added to the pressure oil from the hydraulic pump. Driven.

That is, the hydraulic circuit is provided with a hydraulic pump whose discharge capacity for pressure oil is adjusted to a low speed drive speed.
There is no need to install a high capacity hydraulic pump separately,
Therefore, even when the slide speed of the slide member can be switched to a low speed or a high speed, the overall configuration can be simplified.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 2, the resin kneading and granulating apparatus according to the present embodiment is provided with a kneading machine 1 to which a powdery granular resin material is supplied, and a molten resin melted and kneaded by the kneading machine 1 at a predetermined pressure. Pump 2
And a screen changer 3 and a die plate 4 which will be described later.
・ Pelletizer 5 is installed in sequence.

As shown in FIG. 3, the screen changer 3 has a changer body 6 as a main body, in which a resin flow path 7 which is once branched vertically is provided. A mesh-shaped screen 8.8 for filtering impurities contained in the molten resin is provided in each of the branch channels 7a. These screens 8 and 8 are respectively supported from the downstream side (left side in the figure) by breaker plates 9 and 9 having a perforated disk shape, and the upper and lower screens 8 and breaker plates 9 are slide bars 10 and 10 described later. Are assembled and retained respectively.

The die plate 4 is connected to the downstream end face of the changer body 6 through an intermediate die 11, and the die plate 4 is provided with a large number of pore-shaped die nozzles 4a. There is. Screen changer 3
The molten resin supplied via the die is extruded into the pelletizer 5 through the die nozzles 4a. A water chamber 12 into which cooling water PCW is supplied from below and discharged upward is formed in the pelletizer 5 so as to contact the die plate 4, and a rotary blade 13 is provided in the water chamber 12. ing. The rotary blade 13 is fixed to the tip of a rotary shaft 14, and is configured to rotate at a position in contact with the surface of the die plate 4 by driving the rotary shaft 14 by a motor (not shown). Further, the rotary shaft 14 is provided so as to be movable back and forth in the axial direction so that the rotary blade 13 moves in the contacting / separating direction with respect to the die plate 4.

In the pelletizer 5 having the above structure, the molten resin extruded into the water chamber 12 through the die nozzles 4a ...
The resin pellets 15 are cooled by PCW and cut into a required size by the rotary blade 13 to form resin pellets 15. These resin pellets 15 are carried out together with the cooling water PCW from above the water chamber 12. The pelletizer 5 is mounted on a carriage 16 and can be separated at the joint surface between the die plate 4 and the water chamber 12.

Next, the structure of the upper and lower slide bars 10 and 10 for holding the screen 8 and the breaker plate 9 will be described. These slide bars 10, 10 are
As shown in FIG. 4, the changer bodies 6 are horizontally penetrated, and the length in the penetrating direction is slightly larger than twice the width dimension of the changer body 6. Further, in the figure, circular openings are formed at the respective central positions of the left half, and the screen 8 is attached together with the breaker plate 9 so as to close these circular openings.

Hydraulic cylinders 20 and 20 are connected to the slide bars 10 and 10, respectively, so that the slide cylinders 10 and 10 can perform horizontal position switching independently of each other. It is configured. That is, the cylinder rods 20a, 20a of the hydraulic cylinders 20, 20
Slide bar 10 when each is in the retracted position.
The screen 10 is held with the screen 8 positioned inside the changer body 6 (hereinafter, the slide bar at this time).
Position 10 is called the screen position). At this screen position, the screens 8 and 8 are respectively located on the branch flow passages 7a and 7a so as to intersect with each other, whereby the molten resin supplied into the changer body 6 is, as described above, It is filtered at 8.8 and supplied to the pelletizer 5 side.

On the other hand, in FIG. 5, the upper slide bar
As shown in FIG. 10, when the hydraulic cylinder 20 is driven to position the cylinder rod 20a at its forward position, the slide bar 10 is pushed leftward in the drawing from the above, and the screen 8 moves to the changer body 6 side. It is in a state of being located outside (hereinafter, the position of the slide bar 10 at this time is referred to as a screen exchange position). As a result, when the screen 8 becomes dirty due to the accumulation of impurities, it is replaced with a new screen by appropriately switching to the screen replacement position as described above.

Incidentally, the upper slide bar 10
When the screen 8 is to be replaced with the screen located at the screen replacement position, the upper branch passage 7a in the changer body 6 is blocked by the slide bar 10, and therefore the upper branch passage 7a is passed through. Although the supply of the molten resin is stopped, but the supply of the molten resin through the lower branch flow path 7a is continued, so that the screen 8 can be replaced without stopping the operation.

Contrary to the above, the operation is stopped in the same manner as above by positioning the lower slide bar 10 at the screen exchange position while keeping the upper slide bar 10 at the screen position. It is possible to replace the lower screen 8 without changing the screen. Thus, when the screen 8 is replaced, one hydraulic cylinder 20
Is driven to the forward position, and further in the present embodiment,
At the start of operation, as shown in Fig. 6, both slide bars 10
・ It is also possible to switch both of the 10 to the state in which they are located at the screen exchange position (hereinafter, this state is referred to as the block position). At this block position, the resin flow path from the kneader 1 to the pelletizer 5 is blocked in the screen changer 3.

Next, turn off the slide bars 10 and 10 described above.
The hydraulic circuit configuration for performing the replacement will be described. Figure 1
As shown in, the hydraulic circuit 21 has
Ill supply line L _PHigh / low speed switching valve connected to
A switching means) 23 is provided. This switching valve 23 is
Oil supply line L_PA pair of switching ports A on the output side
It consists of a 3-port directional valve that selectively switches to B.
Low speed oil supply line L to one switching port A_NBut
On the other hand, the other switching port B has a high-speed oil supply line L._H
Are connected respectively.

The tip side of the low speed oil supply line L _N is 4
Each of the four branches is connected to the P port of each of the four first to fourth low speed directional control valves 24a to 24d. Each of the low speed directional control valves 24a to 24d is a 3-port directional control valve that selectively switches the internal connection to the A port between the P port and the R port, and each R port stores oil in the tank. The tank lines L _T returning to 25 are respectively connected.

The first and second low speed directional switching valves 24a
Each A port of 24b is connected to the forward connection port P _DF and the reverse connection port P _{DR of} the lower hydraulic cylinder 20 through the first and second oil supply / discharge lines L _DF and L _DR , respectively. Connected to each. Also, the A ports of the third and fourth low speed directional control valves 24c and 24d are respectively connected to the third port.
It is connected to the forward connection port P _UF and the reverse connection port P _{UR of} the upper hydraulic cylinder 20 via the fourth oil supply / discharge lines L _UF and L _UR , respectively. In addition, each first
~ For the 4th oil supply / discharge line L _DF / L _DR / L _UF / L _UR ,
Bidirectional first, each consisting of a 2-port switching valve
-The 4th on-off valve 26a-26d is respectively installed.

On the other hand, it is connected to the B port of the high / low speed switching valve 23.
Continued high speed oil supply line L _HFor high speed
It is connected to the P port of the exchange valve 27. And the above
L _HA pair of accumulators 28, 28 are connected to
These accumulators 28 · 28 from the hydraulic pump 22
Switching the direction for high speed by temporarily accumulating oil
Supply high-pressure, large-volume oil to the P port of valve 27
It is possible to do.

The high-speed directional control valve 27 is composed of a 4-port directional control valve. The A port is internally connected to the P port, and the B port is internally connected to the R port connected to the tank line L _T. Switching between the first position and the second position in which the B port is connected to the P port and the A port is connected to the R port can be performed. The A port of the high-speed directional control valve 27 described above has the first
High-speed oil supply / discharge line L _H1 to the first / third oil supply / discharge line L _DF / L _UF , and also high-speed directional switching valve
The B port 27 is connected to the second and fourth oil supply / discharge lines L _DR , L _UR via the second high speed oil supply / discharge line L _H2 , respectively. These first and second high speed oil supply / discharge lines L _H1 and L _H2 are also provided with bidirectional first and second high speed on-off valves 29a and 29b each including a 2-port switching valve. .

A relief valve 31 for preventing the oil supply pressure from the hydraulic pump 22 from being excessively increased is connected to the oil supply line L _P , and the oil supply pressure is maintained at a predetermined pressure. An unload relief valve 32 incorporating a check valve 32a is connected. Further, the above-mentioned line L _P, 2-port consists of the switching valve start-stop relief valve 33 for starting and stopping the hydraulic pump 22 as a no-load state is connected.

Next, the operation procedure at the time of starting the operation of the above apparatus will be described. First, as a preparatory work, the carriage 16 is moved to separate the pelletizer 5 from the die plate 4,
In this state, the resin remaining on the die plate 4 and the like is removed, and after cleaning such as passing through the die nozzles 4a ..., the material is put into the kneading machine 1 to perform temporary operation, and each die nozzle Check that the resin is extruded uniformly from 4a (this preparatory work is called strand work).

At this time, the screen changer 3 is held in a state in which the slide bars 10 are located at the screen positions. That is, in the hydraulic circuit 21 shown in FIG. 1, the first to fourth on-off valves 26a to 26d are opened and the first to fourth open / close valves 26a to 26d are opened.
With the second high-speed on-off valves 28a and 28b closed, the pressure oil from the hydraulic pump 22 is sequentially supplied to the oil supply line L _P ,
The oil is supplied to the reverse connection port _PDR / _PUR of each hydraulic cylinder _20/20 through the low speed oil supply line _LN and the second / fourth oil supply / discharge lines _LDR / _LUR , while each hydraulic cylinder 20 is supplied. The high-low speed switching valve 23 and the first to the first so that the 20 forward connection ports P _DF and P _UF communicate with the tank line L _T.
The respective switching positions of the fourth low speed switching valves 24a to 24d are set and held.

When the above strand work is completed, the material input to the kneading machine 1 is temporarily stopped, and the second and fourth low speed directional control valves 24b and 24d, and the first and third low speed directional control valves Switch 24a and 24c in the reverse order of the above. As a result, the forward connection port P _DF · P of each hydraulic cylinder 20 · 20
_Pressure oil from the hydraulic pump 22 is supplied to the _UF , and the reverse connection ports P _DR and P _{UR communicate} with the tank line L _T.
Both of the slide bars 10 and 10 are moved from the screen position to the screen replacement position, and the change body 6
It is held at a block position that blocks both the upper and lower branch flow paths 7a, 7a therein.

By thus positioning both slide bars 10 at the block position, the resin remaining in the resin flow path from the kneading machine 1 to the die plate 4 at this time flows out to the die nozzles 4a. Is prevented in the screen changer 3. In this state, the resin extruded in the above-mentioned strand work is removed and the die plate 4 is cleaned again.

Next, the carriage 16 is moved to move the pelletizer 5
Is connected to the die plate 4, and thereafter, the feeding of the material into the kneading machine 1 and the driving of the gear pump 2 are restarted. On the other hand, on the side of the pelletizer 5, the rotation of the rotary blade 13 is activated. At this time, in the hydraulic circuit 21, the pressure oil is supplied to the hydraulic cylinders 20 while the slide bars 10 are kept at the block positions. Switch to perform through the discharge lines L _H1 and L _H2 . That is, with the high-speed directional switching valve 27 in the first position, the high-low speed switching valve 23 is switched to a position where its P port communicates with the B port, and at the same time, the first to fourth opening / closing 26a-26d.
Is closed, and the first and second high-speed on-off valves 28a and 28b
Open.

As a result, the pressure oil from the hydraulic pump 22 is supplied to the forward connection ports P _DF and P _UF of the respective hydraulic cylinders 20 and 20 by the oil supply line L _P , the high speed oil supply line L _H , and the first high speed. The oil supply / discharge line L _H1 and the first / third oil supply / discharge line L _DF / L _{UF are} supplied. And in this state, each accumulator 28
The pressure oil from the hydraulic pump 22 flows into the inside and the pressure is accumulated.

As described above, after the driving of the gear pump 2 is restarted for a predetermined time, or when it is detected that the supply pressure of the resin has risen to a predetermined pressure, the rotary blade 13 is moved to the die plate in the pelletizer 5. 4 is advanced to a position close to 4, and the supply of water PCW into the water chamber 12 is started, and at the same time as this, each slide bar 10 is moved from the block position to the screen position.

The movement of the slide bar 10 is carried out by switching the high speed directional switching valve 27 in the hydraulic circuit 21 from the first position to the second position. By this switching, each hydraulic cylinder 20 ・ 20 reverse connection port P _DR・ P
_The high speed oil supply line L _H is connected to the _UR via the second high speed oil supply / discharge line L _H2 and the second / fourth oil supply / discharge line L _DR / L _UR , whereby each accumulator 28/28 is connected. pressure oil that has been accumulated is - each port P _DR within
Supplied to P _UR .

At this time, a large amount of pressure oil is supplied from the accumulators 28, 28 to each hydraulic cylinder 20, 20 in a shorter time than in the case of the hydraulic pump 22 alone, whereby each slide bar 10, 10. Will cause a fast movement from the block position to the screen position. As a result, the molten resin in the pressurized state, which has been stopped on the upstream side of each slide bar 10 in the screen jigger 3 until then, is supplied all at once to the die nozzle 4a, and passes through the die nozzle 4a to the water chamber 12 of the pelletizer 5. Pushed out,
After being cut by the rotary blade 13 and cooled, the production of the resin pellets 15 is started.

After that, the pressure oil to each hydraulic cylinder 20
Supply is low speed oil supply line L _NDone through
Can be switched to. That is, opening and closing for the first and second high speed
The valves 28a and 28b are closed, and the first to fourth opening / closing valves 26a to 26d are opened.
Then, the switching position of the high / low speed switching valve 23 is switched. to this
Therefore, it is necessary to continue the above operation and replace the screen 8.
If necessary, the low speed oil supply line
In L_NBy supplying pressure oil through the slide bar
Slowly move 10 from the screen position to the screen replacement position.
Slide bar after the screen is replaced.
10 is returned to the screen position at low speed as above
It

As described above, in the present embodiment, when the strand work is completed at the start of the operation, the pair of slide bars 10 and 10 are positioned at the block position so that the molten resin flows in the screen changer 3. In the stopped state, the pelletizer 5 is connected to the die plate 4 in this state, and the rotary blade 13 is brought close to the die plate 4. Therefore, the amount of molten resin dripping from the die nozzle 4a during this period is reduced, and as a result, the resin is not wound around the rotary blade 13 at the start of manufacturing, and smooth startup is possible.

As described above, by operating the pair of slide bars 10 in the screen changer 3 provided adjacent to the die plate 4 so as to block the entire resin flow passage at the start of the operation, It is not necessary to separately provide a dedicated member for opening and closing the road or a drive mechanism therefor, and therefore it is possible to suppress the occurrence of trouble at the start of operation without making the overall configuration complicated.

In this embodiment, the slide bar 10
The hydraulic circuit 21 that drives 10 is provided with a high-speed oil supply line in addition to the low-speed oil supply line, and when moving the slide bar 10/10 from the block position to the screen position, the moving operation is performed at high speed. It is supposed to occur, so until then, ScreenGenger 3
The molten resin under pressure that was stopped inside is the die nozzle 4a
Will be supplied all at once. As a result, the nozzle 4a
The number of blockages in the engine is reduced, which can further suppress the occurrence of troubles at the start of operation.

Further, since the high-speed oil supply line as described above is constructed by providing the accumulator 28, the hydraulic pump 22 may have a capacity adapted to discharge the pressure oil at a low speed. Apart from this, it is not necessary to provide a high-capacity hydraulic pump, and therefore the overall structure can be made simpler. As a result, even if, for example, the conventional equipment is modified to enable low-speed switching as described above, the modification cost can be made as low as possible.

The above embodiment is not intended to limit the present invention, and various modifications can be made within the scope of the present invention. For example, the present invention is applied to resin kneading and granulating apparatuses of other forms, such as a twin screw extruder provided in place of the kneading machine 1 in the above embodiment, a single screw extruder provided in place of the gear pump 2, and the like. It is possible.

[0048]

As described above, in the method for operating the resin kneading and granulating apparatus according to the first aspect of the present invention, during the operation of bringing the rotary blade close to the die plate after the end of the strand work at the start of operation, Since the pair of slide members in the screen changer are respectively slid to the screen exchange position to stop the flow of the molten resin in the screen changer, the resin dropping from the die nozzle during this period is reduced. In this way, by making the slide member function as a shutoff valve for the resin flow path,
It is possible to suppress the occurrence of trouble at the start of operation without making the entire configuration complicated.

In the operation control device of the resin kneading and granulating apparatus according to the second aspect, the low speed oil supply line and the high speed oil supply line are connected to the hydraulic cylinders for respectively driving the pair of slide members in the screen changer. Further, there is provided a high / low speed switching means for switching the sliding speed at the time of returning the both slide members from the block position to the screen position at a high speed at the start of operation. As a result, the molten resin under pressure that was stopped in the screen ganger is supplied to the die nozzle all at once, so that the nozzle is less clogged.
It is possible to further suppress the occurrence of troubles at the start of operation.

In the operation controller of the resin kneading and granulating apparatus according to the third aspect, the accumulator is provided in the high-speed oil supply line to cause the sliding member to perform the high-speed sliding operation. It is not necessary to provide a high-capacity hydraulic pump separately from the hydraulic pump whose discharge capacity is adjusted to the low-speed driving speed. Therefore, even if the sliding speed of the slide member can be switched to low and high speed, The basic configuration can be made as simple as possible.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a hydraulic circuit configuration for driving a pair of slide bars in a resin kneading and granulating apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an overall configuration of the resin kneading and granulating apparatus.

FIG. 3 is a cross-sectional view showing a main configuration of the resin kneading and granulating apparatus.

FIG. 4 is a sectional view of an essential part showing a state in which a pair of slide bars in the resin kneading and granulating apparatus are respectively located at screen positions.

FIG. 5 is a main-portion cross-sectional view showing a state where one of the pair of slide bars is located at a screen exchange position.

FIG. 6 is a cross-sectional view of an essential part showing a state in which both of the pair of slide bars are located at a screen exchange position.

[Explanation of symbols]

3 Screen Changer 4 Die Plate 4a Die Nozzle 5 Pelletizer 6 Changer Body (Screen Changer Body) 7 Resin Flow Path 7 7a Branch Flow Path 8 Screen 10 Slide Bar (Slide Member) 13 Rotating Blade 15 Resin Pellet 21 Hydraulic Circuit 22 Hydraulic Pump 23 High Low speed switching valve (high / low speed switching means) 28 Accumulator L _N Low speed oil supply line L _H High speed oil supply line

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Nobuki Nagami 2-3-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture Kobe Steel Works Takasago Works (72) Inventor Yoshiaki Nakata 2-chome, Niihama, Arai-cho, Takasago, Hyogo Prefecture No. 3 No. 1 in Takasago Works, Kobe Steel, Ltd. (56) Reference JP 10-95041 (JP, A) JP 8-11193 (JP, A) JP 2-6117 (JP, A) JP 62-167012 (JP, A) JP 52-26548 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) B29B 9/06

Claims (3)

(57) [Claims] 1. A dual, wherein a pair of slide members are provided with a pelletizer for cutting a molten resin extruded through a die nozzle formed on a die plate with a rotary blade to cool it and a screen for filtering the molten resin supplied to the die nozzle. A method for operating a resin kneading and granulating apparatus including a mold screen changer, wherein after the strand work for confirming the extruded state of the molten resin from the die nozzle at the start of operation is completed, the screen of both of the pair of slide members is screened. Slide the sliders to the screen exchange positions that are located outside the changer body and block the resin flow path, and with the flow of the molten resin stopped inside the screen changer body, bring the rotary blade closer to the die plate, and then slide the slide member. The screen is located on the resin channel By returning to the process operation of the plastic mixing and pelletizing apparatus characterized by starting the supply of the molten resin into die nozzle. 2. An operation control device for a resin kneading and granulating apparatus comprising a dual type screen changer in which a screen for filtering molten resin is provided on each of a pair of slide members, the drive control device driving each of the pair of slide members. Is connected to a low-speed oil supply line that causes the sliding speed of the slide member to occur at a low speed and a high-speed oil supply line that causes the sliding speed to occur at a high speed, and the pressure oil is selectively supplied through these lines. An operation control device for a resin kneading and granulating device, characterized in that high-low speed switching means for switching is provided. 3. The operation control device of the resin kneading and granulating apparatus according to claim 2, wherein the high speed oil supply line is provided with an accumulator for temporarily storing the pressure oil from the hydraulic pump.