JP2019051617A - Connecting mechanism between die and cutter unit, underwater cutting type granulator and connecting method between die and cutter unit - Google Patents

Abstract

To provide a connecting mechanism between a die and a cutter unit which can connect and disconnect the cutter unit to the die even when a center axis of the die and the cutter unit is deviated in a present invention.SOLUTION: A connecting mechanism between a die 8 and a cutter unit 9 according to a present invention has the die 8, a die holder 32 in which the die 8 is fixed and a notch 33 having an opening end 331 and a closed end 332 having a narrow width is formed, and the cutter unit 9 having a lock bar 21 consisting of a first rod part 211 extending toward the die 8, a protrusion 27 attached to a tip end of the first rod part 211, and a second rod part 212 extending in a direction inclined with respect to the first rod part 211, and drive means 22 for driving the lock bar 21. With the protrusion 27 of the lock bar 21 in contact with a rear surface of the die holder 32, the first rod part 211 contacts an inner edge of the closed end 332.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a connecting mechanism between a die and a cutter unit, an underwater cut granulator, and a connecting method between a die and a cutter unit.

  In general, an underwater cut granulator capable of processing a large volume is known for a granulator that processes a synthetic resin raw material into pellets (Patent Document 1). This underwater cut granulator mainly includes a screw mixer, a die, a cutter unit, and the like. The cutter unit includes a circulation box and a cutter.

  An underwater cut granulator kneads and melts a synthetic resin raw material with a screw mixer, continuously discharges the molten synthetic resin raw material from a die hole of a die, and cuts it with a cutter pressed against the die hole. The synthetic resin raw material is processed into pellets. Synthetic resin raw materials have the property of melting at high temperatures and solidifying at low temperatures. Therefore, the synthetic resin raw material is processed at a high temperature that is easy to process. However, it is preferable to retain the shape after cutting. For this reason, the synthetic resin raw material is cooled and maintained in shape after cutting. The synthetic resin raw material is cooled in a circulation box that covers the discharge part side of the die hole. The inside of the circulation box is filled with water. That is, the synthetic resin raw material is discharged from the die hole, cut, and cooled with water.

  In the underwater cut granulator, it is necessary to clean the dice when the synthetic resin raw material used for the pellet is changed, or when the operation of the apparatus is started or stopped. The cleaning of the die is an operation of scraping and discarding the synthetic resin raw material adhering to the die. When the die hole is covered with the circulation box and the cutter, it is difficult for the operator to perform the scraping work of the synthetic resin raw material. The circulation box and the cutter are preferably configured to be easily removed from the die.

  In the underwater cut granulator described in Patent Document 1, the cutter unit includes wheels and a motor, and the cutter unit can move forward and backward. Further, the cutter unit is disposed in front of the surface of the die where the die hole is formed, a circulation box disposed with the opening facing the surface where the die hole is formed, and a cutter disposed inside the circulation box. It has. When the cutter unit moves forward, the circulation box can be connected to the opposing die, and when the cutter unit moves backward, the connection between the circulation box and the die can be released. At this time, the cutter pressed against the die hole also moves together with the circulation box.

  If the direction of the rotation axis of the cutter and the normal direction of the die deviate when the circulation box and cutter are pressed against the die, only a part of the cutter will be offset and come into strong contact with the die. Causes wear. For this reason, when connecting the circulation box and the cutter to the die, the circulation box is firmly pressed against the die so that the cutter contacts the die evenly, and the normal direction of the die and the rotation axis of the cutter are fixed. Need to match direction.

  In the underwater cut granulator described in Patent Document 1, the circulation box of the cutter unit is fixed to the die using a lock bar and a cutter lock ring. The lock bar is provided in the cutter unit and is made of a rod-like member having a bulge at the tip. The lock bar can be driven in the axial direction by a hydraulic cylinder provided in the cutter unit, or can be driven independently from the cutter unit. On the other hand, the cutter lock ring is provided on the die side and has a Dalma hole-shaped lock hole. That is, the lock hole has a configuration in which a large diameter portion and a small diameter portion are connected.

  Specifically, the circulation box is fixed to the die by the following procedure. First, the cutter unit is brought close to the die, the circulation box is brought into close contact with the die, and the lock bar extending from the cutter unit is inserted into the lock hole of the cutter lock ring on the die side so that the large diameter portion at the tip of the lock bar is locked. The lock bar is advanced to pass through the hole. Thereafter, the cutter lock ring is rotated. As a result, the lock bar shifts from a state in which the large diameter portion of the lock hole of the cutter lock ring is inserted to a state in which the small diameter portion of the lock hole is inserted. The tip of the lock bar is thicker than the lock bar shaft. Further, the tip of the lock bar can be inserted through the large diameter portion of the lock hole, but cannot be inserted through the small diameter portion of the lock hole. For this reason, after rotating the cutter lock ring, the lock bar cannot be detached from the cutter lock ring.

  Therefore, after the cutter lock ring is rotated as described above, the cutter lock ring locked to the large-diameter portion of the lock bar is pulled against the cutter unit by pulling the lock bar with the hydraulic cylinder on the cutter unit side. Approaching relatively, the circulation box is fixed in a state of being strongly pressed against the die. As a result, the circulation box is fixed on the connecting surface with the die without any backlash, and the positional relationship between the circulation box and the die is fixed, and the normal direction of the die and the direction of the rotation axis of the cutter arranged inside the circulation box Match.

JP 2006-239990 A

  However, in the underwater cut granulator described in Patent Document 1, when the rotation axis of the cutter lock ring of the die is shifted from the central axis of the connecting portion to the die of the cutter unit, a lock bar extending from the cutter unit is provided. After being inserted into the lock hole of the cutter lock ring, the cutter lock ring cannot be rotated and the die and the cutter unit may not be connected. This is because when the cutter lock ring is rotated, the lock bar interferes with the end surface of the small diameter portion of the lock hole.

  Moreover, in a granulator, a die | dye may be heated at the time of granulation and a die | dye may cause a thermal deformation. In this case, even if it is attempted to separate the connected die and the cutter unit, due to the thermal deformation of the die, the lock bar interferes with the end face of the lock hole, and the cutter lock ring is rotated to remove the lock bar. In some cases, the lock hole of the lock ring cannot be returned from the state where the small diameter portion is inserted to the state where the large diameter portion is inserted and cannot be separated.

  Furthermore, when the die and cutter unit are connected again after disconnection, the center axis of the connecting portion of the cutter unit to the die and the rotation axis of the cutter lock ring of the die may be displaced due to the influence of thermal deformation, making it difficult to connect. is there. In that case, it is necessary to adjust the position of the connecting portion so that the central axis of the connecting portion to the die of the cutter unit coincides with the rotation axis of the cutter lock ring.

  Accordingly, an object of the present invention is to provide a connecting mechanism between a die and a cutter unit that can connect and disconnect the cutter unit to and from the die even when the center axis of the die and the cutter unit is displaced. .

  The connecting mechanism between the die and the cutter unit according to the present invention includes a die in which a die hole for discharging a raw material is formed, an opening end and a closed end narrower than the opening end. A die holder having a notch portion formed thereon, a cutter that faces the die and is pressed against a surface to which the raw material of the die is discharged, a first rod portion that extends toward the die, and the first rod Cutter unit comprising: a lock bar comprising a protrusion attached to the tip of the part and a second rod part extending in a direction inclined with respect to the first rod part; and a drive means for driving the lock bar And the drive means advances and retracts the second rod portion in the inclined direction, and advances and retracts in the direction in which the first rod portion extends toward the die. The lock bar is driven so as to move in a direction connecting the open end portion and the closed end portion of the notch portion, and the protrusion of the lock bar is in contact with the back surface of the die holder. A rod part contacts the inner edge of the closed end.

  The underwater cut granulator according to the present invention includes a connection mechanism for connecting the die and the cutter unit.

  The method for connecting the die and the cutter unit according to the present invention uses the connecting mechanism between the die and the cutter unit to bring the protrusion of the lock bar into contact with the back surface of the die holder using the cylinder. A step of causing the first rod portion to abut against an inner edge of the closed end.

  With the above configuration, the present invention provides a connecting mechanism between a die and a cutter unit that can connect and disconnect the cutter unit to and from the die even when the center axis of the die and the cutter unit is displaced.

It is a front view which shows the structure of one Embodiment of the underwater cut type granulator which has the connection mechanism of the dice | dies and cutter unit which concern on this invention. It is a front view which shows the structure of the part of the cutter unit of the underwater cut type granulator shown in FIG. (A1) and (b1) are a sectional view and a front view showing a connecting surface with a die of the cutter unit shown in FIG. 2 before applying hydraulic pressure to the hydraulic cylinder, and (a2) and (b2) are It is sectional drawing and front view which show the connection surface with the die | dye of the cutter unit shown in FIG. 2 after adding hydraulic pressure to a hydraulic cylinder. (A), (b) is the top view and front view which show the connection surface with the cutter unit of the die | dye shown in FIG. (A1) is sectional drawing seen from the upper side which shows the structure of the connection part of the die | dye before adding hydraulic pressure to a hydraulic cylinder, and a cutter unit, (b1) is the CC arrow part of (a1) FIG. (A2) is an upper cross-sectional view showing the structure of the connecting portion between the die and the cutter unit after applying hydraulic pressure to the hydraulic cylinder, and (b2) is a cross-section showing the portion of (a2) taken along the line DD FIG.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the embodiments described below do not limit the present invention. The present invention can be arbitrarily changed within the scope of the technical idea.

[Configuration of underwater granulator]
FIG. 1 is a diagram for explaining a configuration of an embodiment of an underwater cut granulator 1 having a connecting mechanism for a die 8 and a cutter unit 9 according to the present invention.

  The underwater cut granulator 1 is connected to a feeder 14 and a circulating water pipe 41. The synthetic resin raw material supplied from the feeder 14 is processed into pellets inside the apparatus and discharged from the circulating water pipe 41 together with the circulating water. It is a device to do. As shown in FIG. 1, the underwater cut granulator 1 is configured by connecting various components.

  The feeder 14 is a device for supplying a certain amount of synthetic resin raw material per unit time to the underwater cut granulator 1, and is disposed at the upper part of the underwater cut granulator 1.

  The underwater cut granulator 1 mainly includes a hopper 13, a screw mixer 4, a diverter valve 5, a gear pump 6, a screen changer 7, a die holder 32, a die 8, and a cutter unit 9. Configured. That is, the synthetic resin raw material supplied from the feeder 14 is processed through each component in this order. Further, the cutter unit 9 includes a carriage 50 and a circulation box 40.

  The hopper 13 has a raw material supply port at the top, and has a funnel-like shape. The synthetic resin raw material supplied from the feeder 14 is received at the upper raw material supply port and supplied to the screw mixer 4.

  The screw mixer 4 receives the synthetic resin raw material supplied from the feeder 14 from the hopper 13. The screw mixer 4 is heated and kneads and melts the synthetic resin raw material inside. The screw mixer 4 sends the kneaded and melted synthetic resin raw material to the diverter valve 5 in the next step.

  The diverter valve 5 has one inlet, two outlets, and a valve. By switching the valve, the diverter valve 5 can discharge the synthetic resin raw material entering from the inlet from any outlet. One outlet of the diverter valve 5 is connected to the gear pump 6, and the other outlet is connected to the outside of the underwater cut granulator 1. That is, the diverter valve 5 switches whether the synthetic resin raw material melted and kneaded by the screw mixer 4 flows to the gear pump 6 or is discharged to the outside.

  Specifically, when the physical properties of the melt-kneaded synthetic resin raw material are stable, the diverter valve 5 injects the synthetic resin raw material from one outlet, and the synthetic resin raw material is injected into the gear pump 6 in the next step. Send to. On the other hand, if the physical properties of the melt-kneaded synthetic resin raw material are not stable, the product produced by the underwater cut granulator 1 will be defective. Therefore, the diverter valve 5 uses the synthetic resin raw material as the other material. It is discharged from the outlet of the underwater cut granulator 1 to the outside.

  The gear pump 6 is connected to the diverter valve 5 and the screen changer 7, and pushes out the synthetic resin raw material supplied from the diverter valve 5 to the screen changer 7 while being pressurized.

  The screen changer 7 includes a plurality of screens (not shown). The synthetic resin raw material supplied from the gear pump 6 is removed of impurities by passing through the screen. Further, the screen changer 7 replaces the screen without stopping the underwater cut granulator 1 when the screen is clogged. The synthetic resin raw material that has passed through the screen changer 7 goes to the die 8 through the die holder 32.

  The die holder 32 is connected to the screen changer 7 and is a part for fixing the die 8. Since the die 8 can be easily removed from the die holder 32, maintenance of the die 8 can be easily performed.

  The die 8 is fixed to the die holder 32, and a plurality of die holes 81 (see FIG. 4) are formed. The die 8 receives the synthetic resin raw material supplied from the screen changer 7 from the die holder 32 and passes the die hole 81 to process the synthetic resin raw material into a long and thin cylindrical shape.

  The diverter valve 5, the gear pump 6, the screen changer 7 and the die 8 described above are heated to maintain the workability of the synthetic resin raw material.

  The cutter unit 9 can approach and leave the die 8 by a movable carriage 50. The circulation box 40 provided in the cutter unit 9 has a box shape having an opening 29 (see FIG. 3) facing the die 8 side. When the cutter unit 9 approaches the die 8, the die hole 81 of the die 8 is covered with the circulation box 40. That is, the synthetic resin raw material discharged from the die hole 81 is configured to enter the inside of the circulation box 40. A cutter 60 (see FIG. 2) is disposed inside the circulation box 40. When the cutter unit 9 is connected to the die 8, the cutter 60 is pressed against the surface of the die 8 where the die hole 81 is formed. The cutter 60 cuts the synthetic resin raw material discharged from the die hole 81 and processes it into a pellet shape. Further, the circulation box 40 is connected to a circulation water pipe 41. Thereby, when the underwater cut granulator 1 is operated, the inside of the circulation box 40 is filled with the water supplied from the circulation water pipe 41. The cut synthetic resin raw material is cooled with water and fixed in shape.

  The cooled pellet-shaped synthetic resin raw material passes through the circulating water pipe 41 together with the circulating water and is transported to a dehydration / drying apparatus (not shown). The synthetic resin raw material is dried by a dehydration / drying device to produce pellets.

[Detailed configuration of cutter unit]
Next, the configuration of the cutter unit 9 provided in the underwater cut granulator 1 shown in FIG. 1 will be described in more detail. FIG. 2 is a diagram showing a configuration of the cutter unit 9 provided in the underwater cut granulator 1 shown in FIG. The cutter unit 9 includes a circulation box 40, a carriage 50, a cutter motor 50a, a pinion 53, a chain 54, an air motor 55, a cutter 60, and earthquake-resistant rubber (not shown). The cutter unit 9 is disposed on the flat base 51. A rack 52 is disposed on the upper portion of the base 51.

  The cutter unit 9 is disposed in front of the discharge surface of the synthetic resin raw material of the die 8. The cutter unit 9 has a configuration in which various components for processing a synthetic resin raw material are mounted on a carriage 50 having a driving means (air motor 55) for moving. Specifically, the cutter unit 9 has a configuration in which an earthquake-resistant rubber is disposed on a carriage 50, and a circulation box 40, a cutter motor 50a, and a cutter 60 are disposed thereon. The circulation box 40 is arranged on the carriage 50 with the opening 29 (see FIG. 3) facing the discharge surface of the synthetic resin raw material of the die 8. Further, the carriage 50 can move in the front-rear direction (direction A in the figure). Thereby, the circulation box 40 can be connected to the die 8 by moving forward, and the circulation box 40 can be separated from the die 8 by moving backward. Further, when the circulation box 40 and the die 8 are connected, the circulation box 40 and the die 8 are firmly adhered by a fixing mechanism described later.

  The power of the air motor 55 mounted on the carriage 50 is used to move the cutter unit 9. The air motor 55 is connected to the pinion 53 via the chain 54. The pinion 53 meshes with the rack 52 of the base 51 fixed to the surface on which the underwater cut granulator 1 is installed. Thereby, the power of the air motor 55 is converted into the movement of the carriage 50 in the longitudinal direction.

  The cutter 60 is disposed inside the circulation box 40. The cutter motor 50 a is connected to the cutter 60 inside the circulation box 40. The cutter motor 50a rotates the cutter 60.

[Fixing mechanism of connecting part of cutter unit and die]
Next, the fixing structure of the connecting portion between the circulation box 40 of the cutter unit 9 and the die 8 will be described. FIG. 3 is a view showing a connection portion of the circulation box 40 provided in the cutter unit 9 to the die 8. As shown in FIG. 3, the cutter unit 9 includes a lock bar 21, a hydraulic cylinder 22, a spring 23, an air cylinder 24, a safety device 25, and a stopper 26 around the circulation box 40.

  3 (a1) and (b1) show the state before the hydraulic pressure is applied to the hydraulic cylinder 22 of the cutter unit 9, and FIGS. 3 (a2) and (b2) show the hydraulic pressure applied to the hydraulic cylinder 22. Indicates the state. 3A1 is a view showing a cross section AA in FIG. 3B1, and FIG. 3A2 is a view showing a BB cross section in FIG. 3B2.

  Around the circulation box 40, there is a mechanism arrangement portion in which a mechanism for moving the lock bar 21 used for fixing to the die 8 is arranged. The circulation box 40 has a flat contact surface 28 that comes into contact with the die 8. The contact surface 28 is formed with four openings 29 through which the synthetic resin raw material discharged from the die 8 enters and four long holes 30 arranged so as to surround the opening 29. From the elongated hole 30, the tip of the lock bar 21 protrudes. The longitudinal directions of the long holes 30 are all unified in the same direction (the left-right direction in FIG. 3B1). The long hole 30 penetrates from the contact surface 28 to the mechanism arrangement portion inside the circulation box 40. A hydraulic cylinder 22 used for moving the lock bar 21 is arranged in the mechanism arrangement portion of the circulation box 40.

  The lock bar 21 is made of a rod-shaped member. The lock bar 21 includes a first rod portion 211 extending toward the die 8 along a direction orthogonal to the contact surface 28 and a second rod portion 212 extending in a direction inclined by 45 degrees with respect to the first rod portion 211. Have However, this inclination angle is not limited to 45 degrees. In addition, a protrusion 27 is provided at the tip of the first rod portion 211 of the lock bar 21 so that the diameter of the tip is thicker than the diameter of other portions.

  The hydraulic cylinder 22 is a single-acting cylinder, and a spring 23 is disposed inside. The hydraulic cylinder 22 is arranged in the mechanism arrangement part of the circulation box 40. At this time, the hydraulic cylinder 22 is disposed at an angle that is the same as the bending angle of the lock bar 21 with respect to an axis perpendicular to the contact surface 28, that is, 45 degrees. The hydraulic cylinder 22 accommodates a part of the second rod portion 212 of the lock bar 21. That is, the second rod portion 212 is a piston rod of the hydraulic cylinder 22, and the traveling direction of the hydraulic cylinder 22 and the direction in which the second rod portion 212 extends coincide with each other. The axis of the first rod portion 211 of the lock bar 21 is arranged so as to coincide with the axis perpendicular to the contact surface 28.

  When hydraulic pressure is applied to the hydraulic cylinder 22, the hydraulic cylinder 22 starts from a state where the second rod portion 212 of the lock bar 21 is pushed out of the hydraulic cylinder 22 (see FIG. 3 (a 1)). (See FIG. 3 (a2)). At this time, since the hydraulic cylinder 22 is arranged to be inclined with respect to the contact surface 28, the protrusion 27 of the lock bar 21 moves in the direction of the contact surface 28 and is parallel to the contact surface 28. Move in the direction as well.

  On the other hand, when the hydraulic pressure is removed from the hydraulic cylinder 22, the second rod portion 212 of the lock bar 21 protrudes from the hydraulic cylinder 22 due to the force of the spring 23. As a result, the lock bar 21 returns to the state before the hydraulic pressure is applied to the hydraulic cylinder 22.

  As shown in FIG. 3A 2, in the state where hydraulic pressure is applied to the hydraulic cylinder 22, a space is formed between the wall surface 401 facing the die inside the circulation box 40 and the stopper 26. At this time, the safety device 25 is driven by the air cylinder 24, the safety device 25 is fitted into this space, and the lock bar 21 is fixed.

  FIGS. 4A and 4B are a cross-sectional view and a plan view showing the die 8 connected to the circulation box 40 and the die holder 32 for fixing the die 8.

  As shown in FIG. 4, the die 8 has a disk shape, and a large number of die holes 81 are formed on the surface. The synthetic resin raw material is discharged from the die hole 81 through the die hole 81. The die 8 is attached to the die holder 32 in a replaceable state. By exchanging the die 8 attached to the die holder 32, the specifications of the pellets produced by the underwater cut granulator 1 can be easily changed.

  The die holder 32 is a component for fixing the die 8 and is connected to the screen changer 7 (see FIG. 1). The die holder 32 has fixing ears 34 at four corners. The ear 34 is formed with a notch 33 for engaging the lock bar 21 described above. The notch 33 has an elongated shape, and the longitudinal direction of the notch 33 extends in the horizontal direction. The notch 33 has an open end 331 that opens to the outside and a closed end 332 that is located closer to the center of the die 8 than the open end 331. The width in the direction perpendicular to the straight line connecting the open end 331 and the closed end 332 is narrower at the closed end 332 than at the open end 331.

  FIG. 5 shows the configuration of the connecting portion when the die 8 and the circulation box 40 are connected. FIGS. 5A1 and 5B1 are views showing a state before the circulation box 40 is fixed to the die 8. FIG. FIGS. 5A2 and 5B2 are views showing a state after the circulation box 40 is fixed to the die 8. FIG. 5B1 is a diagram illustrating a cross section taken along the line CC in FIG. 5A1, and FIG. 5B2 is a diagram illustrating a cross section taken along the line DD in FIG. 5A2. The circulation box 40 is fixed to the die 8 by the following procedure.

  First, the cutter unit 9 is brought close to the die 8 (see FIG. 2), and the lock bar 21 is disposed at the positions of the notches 33 at the four corners of the die holder 32 as shown in FIGS. 5 (a1) and 5 (b1). To. In this state, the direction connecting the open end 331 and the closed end 332 of the notch 33 coincides with the direction in which the elongated hole 30 of the circulation box 40 extends. In this state, hydraulic pressure is applied to the hydraulic cylinder 22. As a result, the second rod portion 212 constituting the piston rod of the hydraulic cylinder 22 is drawn into the hydraulic cylinder 22. As a result, the first rod portion 211 moves backward in the direction orthogonal to the contact surface 28 toward the cutter unit 9 and extends in the direction parallel to the contact surface 28 along the direction in which the elongated hole 30 extends. Moving. Since the extending direction of the cutout portion 33 and the elongated hole 30 coincide with each other, the first rod portion 211 that moves along the extending direction of the elongated hole 30 is directed from the open end portion 331 toward the closed end portion 332. (In the direction of the arrow in FIG. 5 (b1)). Finally, at the position where the protrusion 27 of the first rod portion 211 contacts the back surface of the die holder 32 and the first rod portion 211 contacts the inner edge of the closed end 332 of the notch 33. The movement of the lock bar 21 stops. Therefore, if the closed end 332 of the notch 33 is provided at an appropriate position, the lock bar 21 and the cutter unit 9 are always circulated at a certain position (for example, the center axis of the die 8 and the circulation) by driving the hydraulic cylinder 22. The center axis of the box 40 can be moved and fixed.

[Effect 1]
In the present embodiment, as described above, the width of the open end 331 of the notch 33 is wide. Therefore, even when the cutter unit 9 is displaced to some extent with respect to the die 8, the first rod portion 211 can be disposed at the opening end portion 331 of the notch portion 33 when performing the connection. Furthermore, since the width of the notch 33 becomes narrower from the open end 331 toward the closed end 332, the first rod portion 211 can be guided to the above-described fixed position. As a result, the cutter unit 9 can be easily and accurately connected to the die 8 with the position of the cutter unit 9 corrected so that the center axis of the die 8 and the center axis of the circulation box 40 coincide.

  In order to fix the cutter unit 9 to the die 8 without rattling, a plurality of lock bars 21 and notches 33 are provided, and it is preferable that four are provided as in this embodiment.

  Further, as described above, the lock bar 21 is driven by the hydraulic cylinder 22 that can apply a large force. Therefore, the lock bar 21 can move the heavy cutter unit 9 itself. Therefore, even when the center axis of the die 8 and the cutter unit 9 is displaced before the connection, and the end face of the notch 33 of the lock bar 21 and the die holder 32 interferes during the connection, without applying an external force, Only the driving force of the lock bar 21 can bring the die 8 and the central axis of the circulation box 40 into the same position. The driving means for driving the lock bar 21 is not limited to the hydraulic cylinder 22, but is preferably capable of generating a relatively large driving force.

  As described above, when the circulation box 40 is fixed to the die 8, the central axes of the die 8 and the circulation box 40 coincide with each other, so that the cutter 60 accommodated inside the circulation box 40 extends along the surface of the die 8. It is possible to reduce the wear of the cutter 60 and the surface of the die 8. Further, since the cutter 60 is in contact with the surface of the die 8, the pellet can be cut well.

  Further, when the die 8 and the circulation box 40 are separated from each other, the lock bar 21 moves in the direction opposite to the arrow in FIG. 5 (b1) in FIG. 5 (b1). As the lock bar 21 moves in this direction, the length in the short direction of the notch 33 that engages with the lock bar 21 increases. Therefore, the die 8 and the circulation box 40 can be separated from each other with a small force compared with the case of fixing. For this reason, when the separation is performed with the same force as the fixing, it is difficult to cause a problem that the separation cannot be performed when the fixing is performed.

[Effect 2]
In the present embodiment, the die 8 and the circulation box 40 can be fixed without using the cutter lock ring and the pneumatic cylinder for the cutter lock ring used in the underwater cut granulator described in Patent Document 1. Can do.

  That is, when the underwater cut granulator 1 is configured as in the present embodiment, it is possible to place other pipes and devices where the cutter lock ring and the pneumatic cylinder have conventionally been arranged. The degree of freedom increases and workability in the factory is improved.

[Effect 3]
In the present embodiment, as shown in FIGS. 5A2 and 5B2, the safety device 25 is disposed between the wall surface 401 facing the die side of the circulation box 40 and the stopper 26 fixed to the lock bar 21 when fixed. The Therefore, even when a power failure occurs and the hydraulic cylinder 22 loses power, the die 8 and the circulation box 40 can be kept fixed.

  Thereby, the accident where the circulating water inside the circulation box 40 flows out from the clearance gap between the dice | dies 8 and the circulation box 40 can be prevented.

[Effect 4]
In the cutter unit 9, earthquake resistant rubber is disposed between the circulation box 40 and the carriage 50. As a result, even when the center axis of the dice 8 and the circulation box 40 is larger than when the seismic rubber is not disposed, the seismic rubber absorbs this deviation, and the center of the die 8 and the circulation box 40 is absorbed. It can be fixed so that the axes coincide.

  Therefore, the die 8 and the circulation box 40 can be fixed even if the deviation between the center axis of the die 8 and the circulation box 40 before fixation is larger.

DESCRIPTION OF SYMBOLS 1 Underwater cut type granulator 8 Die 9 Cutter unit 21 Lock bar 22 Hydraulic cylinder 27 Protrusion part 32 Die holder 33 Notch part 40 Circulation box 60 Cutter

Claims (7)

A die in which a die hole for discharging the raw material is formed;
A die holder in which the die is fixed and a notch having an open end and a closed end narrower than the open end is formed;
A cutter facing the die and pressed against a surface of the die from which the raw material is discharged; a first rod portion extending toward the die; and a protrusion attached to the tip of the first rod portion; A cutter unit comprising: a lock bar composed of a second rod portion extending in a direction inclined with respect to one rod portion; and a driving means for driving the lock bar;
With
The driving means causes the second rod portion to advance and retreat in the inclined direction, and the first rod portion advances and retracts in a direction extending toward the die, and the opening end portion of the notch portion and the The lock bar is driven to move in the direction connecting the closed end,
The first rod portion contacts the inner edge of the closed end in a state where the protrusion of the lock bar contacts the back surface of the die holder;
A connecting mechanism between the die and the cutter unit. In the connection mechanism between the die and the cutter unit according to claim 1,
The drive means is a hydraulic cylinder, and a part of the second rod portion is housed inside the hydraulic cylinder to form a piston rod;
A connecting mechanism between the die and the cutter unit. In the connection mechanism between the die and the cutter unit according to claim 1 or 2,
The cutter unit is
A wall faced through the lock bar and facing the die;
A stopper attached to the lock bar;
Safety devices;
An air cylinder that drives the safety device;
With
The safety device is fitted in a gap generated between the stopper and the wall surface in a state where the protrusion of the lock bar is in contact with the back surface of the die holder, and fixes the lock bar.
A connecting mechanism between the die and the cutter unit. In the connection mechanism between the die and the cutter unit according to any one of claims 1 to 3,
The cutter unit includes a carriage,
An anti-seismic rubber disposed at the top of the carriage;
Further comprising
The cutter, the lock bar and the driving means are disposed on an upper part of the earthquake-resistant rubber;
A connecting mechanism between the die and the cutter unit. In the connection mechanism between the die and the cutter unit according to any one of claims 1 to 4,
A plurality of lock bars and notches are provided, and the plurality of lock bars can be moved independently of each other. A connecting mechanism between the die and the cutter unit according to any one of claims 1 to 5,
Underwater cut granulator. Using the connecting mechanism between the die and the cutter unit according to any one of claims 1 to 5,
A step of bringing the protrusion of the lock bar into contact with the back surface of the die holder by the driving means and bringing the first rod portion into contact with an inner edge of the closed end;
Comprising
How to connect the die and cutter unit.

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