JPH10244533A - Operation method for resin kneading granulator and operation control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable reduction of the amount of resin dropping from a die nozzle during an operation of causing a rotary blade to approach a die plate after a strand operation is completed in initiating an operation of a resin kneading granulator by causing a pair of sliding members in a screen changer to slide to a screen change position, respectively so as to create a state in which the flow of molten resin is stopped in the screen changer. SOLUTION: After the completion of a strand operation both of a pair of sliding bars 10, 10 in a dual type screen changer 6 are caused to slide to a screen change position, respectively, so as to stop the flow of molten resin inside the screen changer 6 and in this state a rotary blade is caused to approach a die plate, and thereafter the sliding bars 10, 10 are restored to a screen position, when the supply of molten resin to a die nozzle 4a is started. This serves to reduce the amount of resin dropping from the die nozzle to thereby restraining troubles from happening in starting the operation of a continuous resin kneading granulator.

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 for a resin kneading and granulating apparatus provided with a dual type screen changer.

[0002]

2. Description of the Related Art FIGS. 2 to 5 are explanatory diagrams of an example of the structure and operation of a resin kneading and granulating apparatus as described above.
This will be described with reference to FIG. 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 on the die plate 4 into resin pellets 15 of a required size by the rotary blade 13, and the cooling water PCW. In addition, it is configured to be carried out from above the water chamber 12. The screen changer 3 has built-in screens 8.8 for filtering impurities contained in the molten resin, and these are slide bars slidable in directions intersecting the branch flow paths 7a in the changer body 6, respectively. Assembled and held in 10.10 respectively.

As shown in FIG. 4, each slide bar 10 has a screen position at which the screen 8.8 is located in the changer body 6, and FIG. 5 shows an upper slide bar 10 as shown in FIG. , Screen 8
Is driven by the hydraulic cylinder 20 to slide between a screen replacement position where the outside of the changer body 6 is located. 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 supply of the molten resin is continued, so that the screen can be replaced without stopping the operation.

A hydraulic circuit for supplying hydraulic oil to the hydraulic cylinders 20 has conventionally been provided with a hydraulic pump having a relatively small discharge capacity. That is, the slide operation of the slide bar 10 at the time of the screen exchange as described above is configured to occur at a relatively low speed, and thereby, the safety of the operator who performs the screen exchange operation is ensured. .

On the other hand, in the above-described apparatus, when the operation is stopped, the resin remaining on the die plate 4 and the like is solidified, and the resin is deteriorated by heat of the die plate 4 and the like. Therefore, when the operation is restarted, first, the residual resin is extruded and removed, and a work (cleaning work) for piercing the die nozzles 4a... Or a raw material resin is supplied to the kneading machine 1 so that the molten resin is extruded from the die nozzle. (Strand work) to confirm that the resin is uniformly extruded from each of the die nozzles 4a... Then, the supply of the raw resin to the kneading machine 1 is stopped and the surface of the die plate 4 is cleaned again. Done. These operations can be performed by opening the window of the water chamber 12 and through the window. However, as shown in FIG. 3, usually, the pelletizer 5 is moved from the joint surface with the die plate 4 to the bogie 16. Is performed in a state where it is moved and separated.

[0007] After completion of the above operation, the operation has conventionally been started according to the following procedures. The pelletizer 5 is connected to the die plate 4. The supply of the raw material resin to the kneader 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, as to, the timing of the resin is extruded from the die nozzle and the timing of the same,
Adjust each timing.

[0009]

However, in the above-mentioned conventional resin kneading and granulating apparatus, after the above-described strand work or the like is completed at the start of operation,
Since the resin between the gear pump and the die drips from the die nozzle, the dripping resin wraps around the rotary blade at the time of start, and there is a problem that the start often fails.

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

[0011]

In order to achieve the above object, a method of operating a resin kneading and granulating apparatus according to the first aspect of the present invention is directed to a method for operating a resin kneading and granulating apparatus, comprising: A method of operating a resin kneading and granulating apparatus comprising: a pelletizer for cutting and cooling at a temperature, and a dual type screen changer provided with a pair of slide members each having a screen for filtering molten resin supplied to a die nozzle. After the end of the strand work to check the state of extrusion of the molten resin from the die nozzle at the time, both of the pair of slide members are respectively slid to a screen exchange position where the screen is located outside the screen changer body and blocks the resin flow path. Then, with the flow of molten resin stopped in the screen changer body, It is close to Lee plate, then
The slide member is returned to a 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 after the end of the strand operation until the rotating blade is brought close to the die plate and the production is started. The amount of dripping resin is reduced, thereby enabling a smooth start-up without the resin being wrapped around the rotary blade in the pelletizer at the start of production.

That is, in the above, both of the pair of slide members in the screen changer are slid to the screen replacement position at the start of the operation, so that they function as a shut-off valve for the resin flow path. It is not necessary to separately provide a dedicated member for opening and closing the road and a driving mechanism therefor. Therefore, occurrence of trouble at the start of operation can be suppressed without complicating the entire configuration.

An operation control apparatus for a resin kneading and granulating apparatus according to a second aspect of the present invention is an operation control apparatus for a resin kneading and granulating apparatus having a dual type screen changer in which screens for filtering molten resin are provided on a pair of slide members, respectively. Along with a hydraulic cylinder for driving each of the pair of slide members, a low-speed oil supply line for generating the slide speed of the slide member at a low speed and a high-speed oil supply line for generating the slide speed at a high speed are connected, High and low speed switching means for selectively switching the supply of pressure oil through these lines is provided.

According to such an apparatus configuration, when the screen is replaced during a steady operation, the pressurizing oil is supplied to the hydraulic cylinder through the low-speed oil supply line, and the slide member is moved at a low speed, thereby replacing the screen. , The safety of the worker in the same manner as before is ensured. Then, at the start of operation, when performing the operation of returning both slide members from the screen exchange position to the screen position and starting the production of resin pellets, 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 ginger, is supplied to the die nozzle at a stretch. As a result, clogging of the nozzle is reduced, and thereby, occurrence of trouble at the start of operation can be further suppressed.

According to a third aspect of the present invention, there is provided an operation control device for a resin kneading and granulating apparatus, wherein an accumulator for temporarily storing pressure oil from a hydraulic pump is provided in the high-speed oil supply line. In this configuration, when pressurized oil is supplied to the hydraulic cylinder through the high-speed oil supply line, the pressurized oil stored up to that point in the accumulator is added to the pressurized oil from the hydraulic pump. Driven.

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

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One 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 this embodiment includes a kneader 1 to which a granular resin material is supplied and a molten resin melted and kneaded by the kneader 1 at a predetermined pressure. Pump 2 that supplies high pressure
And screen changer 3 and die plate 4
-Pelletizer 5 is provided sequentially.

As shown in FIG. 3, the screen changer 3 is provided with a resin flow path 7 which is once branched up and down in a changer body 6 as its main body. In each of the branch passages 7a, mesh screens 8.8 for filtering impurities contained in the molten resin are provided, respectively. These screens 8.8 are supported from the downstream side (left side in the figure) by breaker plates 9.9 in the form of a perforated disk, and upper and lower screens 8 and the breaker plate 9 are connected to slide bars 10 and 10 described later. , Respectively.

The die plate 4 is connected to the downstream end surface of the changer body 6 via an intermediate die 11. The die plate 4 is formed with a large number of fine die nozzles 4a. I have. Screen changer 3
Is extruded into the pelletizer 5 through the die nozzles 4a. In the pelletizer 5, a water chamber 12 in which cooling water PCW is supplied from below and discharged upward is formed so as to be in contact with the die plate 4, and a rotary blade 13 is provided in the water chamber 12. ing. The rotary blade 13 is fixed to a 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 rotating shaft 14 is provided so as to be able to advance and retreat in the axial direction so that the rotating blade 13 moves in the direction of contacting and separating from 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 are cooled by PCW and cut into required dimensions by the rotary blade 13 to form resin pellets 15. These resin pellets 15 are carried out from above the water chamber 12 together with the cooling water PCW. The pelletizer 5 is mounted on a cart 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 for holding the screen 8 and the breaker plate 9 will be described. These slide bars 10
As shown in FIG. 4, each of the changer bodies 6 penetrates in the horizontal direction, and the length in the penetrating direction is slightly larger than twice the width of the changer body 6. In the same figure, a circular opening is formed at each central position in the left half, and a screen 8 is mounted together with the breaker plate 9 so as to close the circular opening.

Hydraulic cylinders 20, 20 are connected to the slide bars 10, 10, respectively. The hydraulic cylinders 20, 20 allow the slide bars 10, 10 to switch their horizontal positions independently of each other. It is configured. That is, the cylinder rods 20a of the hydraulic cylinders 20
When the slide bars 10 and
The screen 10 is held in a state where the screen 8.8 is located in the changer body 6 (hereinafter, a slide bar at this time).
The 10 position is called the screen position.) In this screen position, the screens 8, 8 are located crossing each other on the branch flow paths 7a, 7a, whereby the molten resin supplied into the changer body 6 is, as described above, the above-described screen. 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 move the cylinder rod 20a to its advanced position, the slide bar 10 is pushed leftward in the drawing from above, and the screen 8 The slide bar 10 is located outside (the position of the slide bar 10 at this time is referred to as a screen replacement position). Thus, when the screen 8 becomes dirty due to the accumulation of impurities, the screen 8 is replaced with a new screen by appropriately switching to the above-described screen replacement position.

It should be noted that the upper slide bar 10
When the screen 8 is replaced with the screen at the screen replacement position, the upper branch flow path 7a in the changer body 6 is cut off by the slide bar 10, so that the upper branch flow path 7a passes through the upper branch flow path 7a. Although the supply of the molten resin is stopped, the supply of the molten resin through the lower branch flow path 7a is continued, so that the above-described screen 8 can be replaced without stopping the operation.

Conversely, the operation is stopped in the same manner as described above by positioning the lower slide bar 10 at the screen replacement position while keeping the upper slide bar 10 at the screen position. The lower screen 8 can be replaced without the need for replacement. As described above, when the screen 8 is replaced, the one hydraulic cylinder 20 is replaced.
Is driven to the forward position, but in the present embodiment,
At the start of the operation, as shown in FIG.
It is also possible to switch to a state in which both of them are located at the screen exchange position (hereinafter, this state is referred to as a 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, the cutting of each of the slide bars 10 is performed.
A hydraulic circuit configuration for performing the replacement will be described. FIG.
As shown in FIG.
Il supply line L _PHigh / low speed switching valve (high / low speed
(Switching means) 23 is provided. This switching valve 23 is
Oil supply line L_PTo the pair of switching ports A
B, a 3-port directional control valve that selectively switches to B
Low-speed oil supply line L to one switching port A_NBut
Also, the high-speed oil supply line L is connected to the other switching port B._H
Are connected respectively.

The tip of the low-speed oil supply line _LN is 4
It is branched into books and connected to the respective P ports of the four first to fourth low-speed directional switching valves 24a to 24d. Each of the low-speed directional control valves 24a to 24d is a three-port directional control valve for selectively switching the internal connection to the A port between the P port and the R port. It is connected to the tank line L _T to return to 25.

The first and second low-speed directional control valves 24a
The A port 24b is connected to the forward connection port P _DF and the reverse connection port P _{DR of} the lower hydraulic cylinder 20 via the first and second oil supply / discharge lines L _DF and L _DR , respectively. Are connected to each other. The A ports of the third and fourth low-speed directional control valves 24c and 24d are connected to the third port respectively.
_-They are connected to a forward connection port P _UF and a reverse connection port P _{UR of} the upper hydraulic cylinder 20 via a fourth oil supply / discharge line L _UF · L _UR . In addition, each first
The ~ fourth oil supply and discharge line _{L DF · L DR · L UF} · L UR,
First two-way switching valves each comprising a two-port switching valve
To the fourth on-off valves 26a to 26d are respectively provided.

On the other hand, the port B of the high / low speed switching valve 23 is connected.
Continued high-speed oil supply line L _HIs the direction cut off for high speed
The switching valve 27 is connected to the P port. And the above lie
L _HAre connected to a pair of accumulators 28
These accumulators 28, 28
High-speed direction switching by temporarily accumulating oil
Supply high pressure and large volume oil to P port of valve 27
It is possible to do.

The high-speed directional control valve 27 described above consists of four-port directional control valve, A port P port described above, but also, B port is internally connected to the R port connected to a tank line L _T Switching between the first position and the second position where 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 direction switching valve 27 is connected to the first port.
The first and third oil supply and discharge line L _{DF-L UF} via a high-speed oil supply and discharge line L _H1, also fast directional control valve
The B port 27 is connected to the second and fourth oil supply / discharge lines _LDR and _LUR via a second high-speed oil supply / discharge line _LH2 . The first and second high-speed oil supply / discharge lines L _H1 and L _H2 are also provided with two-way first and second high-speed on-off valves 29a and 29b each comprising a two-port switching valve. .

[0032] Incidentally, wherein the oil supply line L _P, the relief valve 31 for preventing excessive boosting of the oil supply pressure from the hydraulic pump 22 is connected, also, to retain the oil supply pressure to a predetermined pressure, An unload relief valve 32 containing 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, an operation procedure at the time of starting operation in the above-described apparatus will be described. First, as a preparation 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 the die nozzles 4a... Through holes, etc., the material is put into the kneading machine 1 and a temporary operation is performed. It is confirmed that the resin is uniformly extruded from 4a ... (hereinafter, this preparation work is referred to as strand work).

At this time, the screen changer 3 is held in a state where the respective slide bars 10 are located at the respective 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,
- in a state in which the second high-speed on-off valve 28a, 28b and closed, the pressure oil from the hydraulic pump 22 are sequentially oil supply line L _P,
Low speed oil supply line L _N, through the second-fourth oil supply and discharge line L _{DR-L UR,} while being supplied to the reverse connection port P _{DR-P UR} of each hydraulic cylinder 20, 20, the hydraulic cylinders 20 - as 20 forward connection ports P _{DF-P UF} of communicating with the tank line L _T, high and low speed switching valve 23 and the first to
Each switching position of the fourth low-speed switching valves 24a to 24d is set and held.

When the above-mentioned strand work is completed, the charging of the material into the kneader 1 is temporarily stopped, and the second and fourth low-speed direction switching valves 24b and 24d and the first and third low-speed switching valves are set. 24a and 24c are switched in the reverse of the above. As a result, the forward connection ports P _DF・ P of each hydraulic cylinder 20 ・ 20
With pressure oil from the hydraulic pump 22 is supplied to the _UF, backward connection port P _DR · P _UR communicates with the tank line L _T,
When both of the slide bars 10 are moved from the screen position to the screen exchange position, the change body 6 is moved.
It is positioned and held at a block position that blocks both the upper and lower branch flow paths 7a.

By positioning both slide bars 10 at the block position in this way, the resin remaining in the resin flow path from the kneader 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 strand operation is removed, and the die plate 4 is cleaned again.

Next, the carriage 16 is moved and the pelletizer 5 is moved.
Is connected to the die plate 4, and thereafter, charging of the material into the kneader 1 and 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 started. At this time, in the hydraulic circuit 21, the supply state of the pressure oil to the hydraulic cylinders 20 is maintained while the respective slide bars 10 are positioned at the block positions. Switching is performed through the discharge lines L _H1 and L _H2 . In other words, with the high-speed directional switching valve 27 in the first position, the high-low 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 to 26d
And the first and second high-speed on-off valves 28a and 28b
Open.

Accordingly, the hydraulic oil from the hydraulic pump 22 is supplied to the oil supply line L _P , the high-speed oil supply line L _H , and the first high-speed connection port P _DF , P _{UF of} each hydraulic cylinder 20, 20. The oil supply / discharge line L _H1 and the first / third oil supply / discharge lines L _DF and L _UF are switched to a state where they are supplied. Then, in this state, each accumulator 28
Inside, the pressure oil from the hydraulic pump 22 flows and is accumulated.

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

The movement of the slide bars 10 is performed by switching the high-speed direction switching valve 27 in the hydraulic circuit 21 from the first position to the second position. By this switching, each hydraulic cylinder 20/20, the retreat connection port P _DR・ P
_UR, the oil supply and discharge line L _H2 for the second high-speed, second-fourth oil supply and discharge line L _{DR-L UR} Line Speed oil supplied through the L _H is connected, whereby, the accumulator 28, 28 The pressure oil stored in the port _PDR
Supplied to P _UR .

At this time, a larger amount of pressurized oil is supplied from the accumulators 28 to the respective hydraulic cylinders 20 in a shorter time than when the hydraulic pump 22 is used alone. Will cause the movement from the block position to the screen position to occur at high speed. As a result, the molten resin in the pressurized state, which has been stopped at the upstream side of each slide bar 10 in the screen genger 3, is supplied to the die nozzle 4a at a stretch, and the water chamber 12 of the pelletizer 5 is passed through the die nozzle 4a. Extruded into
After being cut by the rotary blade 13 and cooled, the production of the resin pellet 15 is started.

Thereafter, the pressure oil is supplied to each of the hydraulic cylinders 20.
Supply oil supply line L for low speed _NDone through
Is switched as follows. That is, opening and closing for the first and second high speed
The valves 28a and 28b are closed, and the first to fourth on-off valves 26a to 26d are opened.
Then, the switching position of the high / low speed switching valve 23 is switched. to this
It is necessary to replace the screen 8 by continuing the above operation.
When necessary, the above-mentioned low-speed oil supply line
Inn L_NSupply of pressurized oil through the slide bar
10 is slowly moved from the screen position to the screen change position.
After the screen 8 has been replaced, the slide bar
10 is returned to the screen position at a low speed as above
You.

As described above, in this embodiment, when the strand work is completed at the start of the operation, the pair of slide bars 10 are positioned at the block position, and the flow of the molten resin is caused to flow in the screen changer 3. In this state, the pelletizer 5 is connected to the die plate 4, and the rotary blade 13 is moved closer to the die plate 4. Therefore, the amount of the resin dripping from the molten resin from the die nozzle 4a during this period is reduced, whereby the resin is not wound around the rotary blade 13 at the start of the production, and a smooth start-up becomes 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 close the entire resin flow path at the start of operation, the resin flow is reduced. It is not necessary to separately provide a dedicated member for opening and closing the road and a drive mechanism therefor. Therefore, it is possible to suppress the occurrence of trouble at the start of operation without complicating the entire configuration.

In this embodiment, the slide bar 10
The hydraulic circuit 21 for driving 10 is provided with a high-speed oil supply line separately from the low-speed oil supply line, and moves the slide bar 10 at a high speed when returning the slide bar 10 from the block position to the screen position. Until that time, until then, screen ganger 3
The molten resin in the pressurized state that was stopped inside
Will be supplied at once. As a result, the nozzle 4a
This reduces the occurrence of trouble at the start of operation.

Since the high-speed oil supply line as described above is provided with the accumulator 28, the hydraulic pump 22 may have a discharge capacity of the hydraulic oil adjusted to a low drive speed. Apart from this, it is not necessary to provide a high-capacity hydraulic pump, so that the overall configuration can be simplified. As a result, for example, even when the conventional equipment is remodeled to enable the low-speed switching as described above, the remodeling cost can be made as low as possible.

The above embodiments do not 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 other types of resin kneading and granulating apparatuses, such as an apparatus having a twin-screw extruder in place of the kneader 1 in the above-described embodiment and an apparatus having a single-screw extruder in place of the gear pump 2. 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, while the operation of bringing the rotary blade close to the die plate is performed after the end of the strand work at the start of the operation. Since a pair of slide members of the screen changer are respectively slid to the screen replacement position and the flow of the molten resin is stopped in the screen changer, the resin dripping from the die nozzle during this period is reduced. In this way, by allowing the slide member to function as a shutoff valve for the resin flow path,
The occurrence of trouble at the start of operation can be suppressed without complicating the entire configuration.

According to the second aspect of the present invention, the low-speed oil supply line and the high-speed oil supply line are connected to a hydraulic cylinder for driving a pair of slide members of the screen changer. In addition, a high-low speed switching means is provided for switching both slide members to return to the screen position from the block position at the start of the operation so as to perform the slide speed at a high speed. As a result, the molten resin in the pressurized state, which has been stopped in the screen janger, is supplied to the die nozzle at a stretch, so that the nozzle is less likely to be clogged.
The occurrence of trouble at the start of operation can be further suppressed.

In the operation control device for the resin kneading and granulating apparatus according to the third aspect, the accumulator is provided in the high-speed oil supply line so as to cause the slide member to perform a high-speed sliding operation. It is not necessary to provide a high-capacity hydraulic pump separately only by providing a hydraulic pump whose discharge capacity is adjusted to the low drive speed. Therefore, even when the slide speed of the slide member can be switched between low and high speed, The simple configuration can be made as simple as possible.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration of a hydraulic circuit 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 sectional view showing a configuration of a main part of the resin kneading and granulating apparatus.

FIG. 4 is a cross-sectional view of a main part showing a state where a pair of slide bars in the resin kneading and granulating apparatus are respectively located at screen positions.

FIG. 5 is a sectional view of a main part showing a state where one of the pair of slide bars is located at a screen replacement position.

FIG. 6 is a cross-sectional view of a main part showing a state where both of the pair of slide bars are located at a screen replacement position.

[Explanation of symbols]

Reference Signs List 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 rotary 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

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuki Nagami 2-3-1, Shinhama, Araimachi, Takasago-shi, Hyogo Inside Kobe Steel, Ltd. Takasago Works (72) Inventor Yoshiaki Nakata 2-chome, Araimachi, Takasago-shi, Hyogo Prefecture No.3-1 Kobe Steel, Ltd. Takasago Works

Claims (3)

[Claims] 1. A dual type wherein a pair of slide members are provided with a pelletizer for cutting and cooling a molten resin extruded through a die nozzle formed on a die plate with a rotary blade, and a screen for filtering the molten resin supplied to the die nozzle. A method for operating a resin kneading and granulating apparatus comprising a mold screen changer, wherein after the strand operation for confirming the state of extrusion of the molten resin from the die nozzle at the start of operation, both the pair of slide members are screened. Sliding to the screen exchange position where it is located outside the changer body and blocks the resin flow path, and in a state where the flow of the molten resin is stopped in the screen changer body, the rotating blade is brought closer to the die plate, and then the slide member Is the screen position where the screen is located on the resin flow path. 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 a molten resin is provided on a pair of slide members, respectively, for driving each of the pair of slide members. A low-speed oil supply line for generating the sliding speed of the slide member at a low speed and a high-speed oil supply line for generating the sliding speed at a high speed are connected to the hydraulic cylinder, and the supply of the pressurized oil through these lines is selectively performed. An operation control device for a resin kneading and granulating device, wherein high / low speed switching means for switching is provided. 3. The operation control device for a resin kneading and granulating apparatus according to claim 2, wherein an accumulator for temporarily storing pressure oil from a hydraulic pump is provided in the high-speed oil supply line.