JP5462721B2 - Screw temperature control device for injection molding machine - Google Patents

Description

  The present invention relates to a screw temperature control device for an injection molding machine. In particular, the present invention relates to a screw temperature control device for an injection molding machine that adjusts the screw temperature using a heat exchange medium.

  An injection molding machine used for injection molding of a resin material includes a cylinder for melting the resin material, a screw that can move inside the cylinder along the axial direction of the cylinder, and that can rotate around the cylinder axis. It is equipped with. The screw includes a screw shaft and a blade formed in a spiral shape on the outer peripheral surface of the screw shaft. The resin material is conveyed toward the injection port of the injection molding machine under the force of the blade as the screw rotates.

  The conveyance of the resin material inside the cylinder depends on the magnitude of the frictional resistance generated between the cylinder or blade and the resin material. Specifically, when the frictional resistance between the blade and the resin material is smaller than the frictional resistance between the cylinder and the resin material, the resin material slides on the blade and moves along the inner peripheral surface of the cylinder. It is conveyed toward. When the frictional resistance between the blade and the resin material is larger than the frictional resistance between the cylinder and the resin material, the resin material slides on the inner peripheral surface of the cylinder and rotates integrally with the blade. It will not be transported toward the injection port.

  If the transport of the resin material in the injection port direction is not performed, the density of the resin material becomes non-uniform inside the cylinder. As a result, the weight and density of the molded product after injection molding are uneven, and there may be a problem that a uniform molded product cannot be obtained.

  The magnitude of the frictional resistance between the cylinder or blade and the resin material varies greatly depending on the temperature of the cylinder, blade or resin material. For this reason, it has been required to adjust the temperature of the cylinder and the screw having the blade.

  In a cylinder fixed to an injection molding machine, a heater and other temperature adjusting means can be provided to perform temperature control relatively easily. Therefore, many cylinder temperature adjusting devices and adjusting methods have been proposed. Yes.

  On the other hand, it is difficult to install heaters and temperature control means that require electrical connection in a screw that moves in a complicated manner such as linear motion or rotational motion with respect to the main body of the injection molding machine. There wasn't.

  Therefore, Patent Literature 1 and Patent Literature 2 disclose a screw temperature adjusting device that adjusts the temperature of a screw using a heat exchange medium such as temperature-controlled water. The screw temperature adjusting device is provided with heat exchange medium control means for controlling the flow rate and temperature of the heat exchange medium. The temperature detection value of the screw is sent to the heat exchange medium control means using a telemeter, and the flow rate and temperature of the heat exchange medium are controlled by the heat exchange medium control means so that the screw temperature becomes a preset temperature. .

JP-A-9-1612 Japanese Patent No. 3515245

  In Patent Document 1, a deep hole is formed in the screw shaft along the axial direction of the screw shaft, and a heat exchange medium is passed through the deep hole to exchange heat between the screw and the heat exchange medium. A temperature regulating device is disclosed. Since the heat exchange medium directly hits the screw, the responsiveness of the screw temperature and the efficiency of heat exchange are improved.

  In the screw temperature adjusting device disclosed in Patent Document 1, it is difficult to machine a deep hole along the axial direction of the screw shaft, which may increase the cost of machining. In particular, as the outer diameter of the screw becomes smaller, deep hole machining becomes more difficult and the machining cost becomes higher. Further, when a deep hole is formed inside the screw shaft, the strength of the screw is lowered, and the durability of the screw may be lowered.

  Patent Document 2 discloses a screw temperature adjusting device including a jacket in which a flow path of a heat exchange medium is formed. A jacket is provided so as to cover the outer peripheral surface of the screw shaft, and heat exchange between the heat exchange medium and the screw is performed by flowing the heat exchange medium through the flow path.

  In the screw temperature adjusting device disclosed in Patent Document 2, the flow path and the screw shaft are separated by a jacket so that the heat exchange medium does not directly hit the screw shaft. Since the heat exchange between the screw and the heat exchange medium is performed with the jacket sandwiched therebetween, there is a limit to the improvement in screw temperature responsiveness and heat exchange efficiency. In particular, when a gap is formed between the screw shaft and the jacket, the heat of the screw is transferred through the air layer, so that the temperature control responsiveness and heat exchange efficiency are further reduced.

  In order to improve the responsiveness of the screw temperature and the heat exchange efficiency, a method of adjusting the temperature by directly applying the heat exchange medium to the screw shaft can be mentioned. Specifically, a flow path is formed by the outer peripheral surface of the screw shaft and the inner peripheral surface of the jacket, and a heat exchange medium is passed through the flow path. As a result, heat is directly transferred between the screw and the heat exchange medium, and the responsiveness of the screw temperature and the heat exchange efficiency are improved.

  However, in an injection molding machine, the screw rotates about its central axis. As the screw rotates, the flow of the heat exchange medium may be disturbed, and stagnation may occur inside the flow path. Residue of the heat exchange medium may cause a decrease in screw temperature adjustment responsiveness and heat exchange efficiency.

  Then, this invention is made | formed in view of the said subject, and it aims at providing the screw temperature control apparatus which is excellent in the responsiveness of temperature control, heat exchange efficiency, and has a simple structure.

In order to achieve the above object, one aspect of the present invention relates to a screw temperature adjusting device of an injection molding machine for adjusting the temperature of a screw using a heat exchange medium. The present invention provides a flow for flowing a heat exchange medium formed by a first jacket covering an outer peripheral surface of a screw shaft of a screw, a groove formed on an inner peripheral surface of the first jacket, and an outer peripheral surface of the screw shaft. A road. The flow path has a supply port for supplying the heat exchange medium to the groove from the outer peripheral surface of the first jacket, and a discharge port for discharging the heat exchange medium from the groove to the outer peripheral surface of the first jacket. The groove is formed so as to maintain a constant flow path width from the supply port to the discharge port , and is disposed in the circumferential direction of the screw shaft while being folded back within a predetermined range in the axial direction of the screw shaft .
Moreover, the other aspect of this invention concerns on the screw temperature adjustment apparatus of the injection molding machine for adjusting the temperature of a screw using a heat exchange medium. The present invention provides a flow for flowing a heat exchange medium formed by a first jacket covering an outer peripheral surface of a screw shaft of a screw, a groove formed on an inner peripheral surface of the first jacket, and an outer peripheral surface of the screw shaft. A road and a second jacket covering the outer peripheral surface of the first jacket. The flow path has a supply port for supplying the heat exchange medium to the groove from the outer peripheral surface of the first jacket, and a discharge port for discharging the heat exchange medium from the groove to the outer peripheral surface of the first jacket. . The groove is formed so as to maintain a constant flow path width from the supply port to the discharge port. The first jacket is rotatably provided with the rotation of the screw, and the supply port and the discharge port are provided at different positions in the axial direction of the screw. A supply groove and a discharge port for supplying the heat exchange medium to the supply port in a region where the second jacket passes on the inner peripheral surface of the second jacket through which the supply port and the discharge port pass when the first jacket rotates. And a discharge groove for receiving a heat exchange medium from.

  According to the present invention, it is possible to provide a screw temperature adjusting device which has excellent temperature response and heat exchange efficiency and has a simple structure.

It is sectional drawing of the injection molding machine which can apply the screw temperature control apparatus of this invention. It is sectional drawing when the screw temperature control apparatus in the 1st Embodiment of this invention is cut | disconnected by the surface parallel to the rotating shaft of a screw. It is sectional drawing when the screw temperature control apparatus shown in FIG. 2 is cut | disconnected by the surface (AA surface shown in FIG. 2) which cross | intersects perpendicularly to the rotating shaft of a screw. It is a figure when the inner peripheral surface of the jacket which concerns on the screw temperature control apparatus of 1st Embodiment is expand | deployed. FIG. 3 is a development view of an inner peripheral surface of a jacket in which a heat exchange medium is relatively likely to stay. It is sectional drawing when the screw temperature control apparatus in the 2nd Embodiment of this invention is cut | disconnected by the surface parallel to the rotating shaft of a screw. It is sectional drawing when the screw temperature control apparatus shown in FIG. 6 is cut | disconnected by the surface (AA surface shown in FIG. 6) which cross | intersects perpendicularly | vertically with the rotating shaft of a screw.

Example 1
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of an injection molding machine to which the screw temperature adjusting device of the present invention can be applied.

  As shown in FIG. 1, the injection molding machine is provided with a cylinder 1 for melting a resin material, and can be moved forward and backward in the axial direction of the cylinder 1 inside the cylinder 1 and rotatable around the axis of the cylinder 1. The screw 2 is provided.

  An injection port 3 for injecting a resin material is provided at one end of the cylinder 1 in the axial direction. When molding a molded product, a mold is attached to the injection port 3. By moving the screw 2 toward the injection port 3, the molten resin material stored in the cylinder 1 is injected toward the mold.

  The screw 2 includes a screw shaft 4 and a blade 5 formed in a spiral shape on the outer peripheral surface of the screw shaft 4. As the screw 2 rotates, a force is received from the blade 5 and the resin material is conveyed toward the injection port 3.

  A hopper 6 for introducing a resin material into the cylinder 1 is provided on the outer peripheral surface of the cylinder 1. The resin material introduced from the hopper 6 is solid, and the resin material is heated and melted while moving toward the injection port 3. Specifically, it is melted by heat applied from the heater 7 provided on the outer periphery of the cylinder 1, or frictional heat and shear heat generated as the screw 2 rotates. In order to ensure the time for heating and melting the resin material, the hopper 6 is disposed at a position away from the injection port 3.

  A hopper flange 8 is provided in the vicinity of the cylinder 1 where the hopper 6 is disposed so as to fit the cylinder 1 therein. The hopper flange 8 has a temperature-controllable structure. By using the hopper flange 8 to cool the cylinder 1 in the vicinity of the hopper 6, melting of the resin material in the vicinity of the hopper 6 can be suppressed.

  The screw shaft 4 is provided so as to protrude from an opening located on the opposite side of the injection port 3 of the cylinder 1. A screw temperature adjusting device 9 for adjusting the temperature of the screw 2 is provided at a portion of the screw shaft 4 protruding from the cylinder. In addition, the blade 5 is not provided in the part of the screw shaft 4.

  FIG. 2 is a cross-sectional view when the screw temperature adjusting device 9 of the injection molding machine according to the first embodiment of the present invention is cut along a plane parallel to the rotation axis of the screw 2. 3 is a cross-sectional view of the screw temperature adjusting device 9 shown in FIG. 2 taken along a plane (A-A plane shown in FIG. 2) that intersects the rotation axis of the screw 2 perpendicularly.

  As shown in FIGS. 2 and 3, the screw temperature adjusting device 9 includes a jacket 10 provided so as to cover the outer peripheral surface of the screw shaft 4. On the inner peripheral surface of the jacket 10, a groove (hereinafter referred to as a heat exchange groove 11) for transferring heat to the screw 2 by flowing a heat exchange medium such as water is formed. That is, the region surrounded by the wall surface of the heat exchange groove 11 and the outer peripheral surface of the screw shaft 4 is the flow channel 12 of the heat exchange medium.

  The flow path 12 includes a supply port 13 for supplying the heat exchange medium from the outer peripheral surface of the jacket 10 to the heat exchange groove 11, and a discharge port for discharging the heat exchange medium from the heat exchange groove 11 to the outer peripheral surface of the jacket 10. And an outlet 14. The supply port 13 and the discharge port 14 are connected to a heat exchange medium control device (not shown) that adjusts the flow rate and temperature of the heat exchange medium.

  The jacket 10 is fixed to the injection molding machine main body. Further, seal members 15 for preventing leakage of the heat exchange medium are provided on both outer sides of the inner circumferential surface of the jacket 10 with respect to the heat exchange groove 11 in the axial direction of the screw 2. By providing the seal member 15, the screw 2 can be rotated without leakage of the heat exchange medium from the gap between the jacket 10 and the screw 2.

  FIG. 4 is a diagram when the inner peripheral surface of the jacket 10 according to the screw temperature adjusting device 9 of the present embodiment is developed. As shown in FIG. 4, a seal member groove for disposing a seal member 15 (FIG. 2) on the inner peripheral surface of the jacket 10 in addition to the heat exchange groove 11 serving as the heat exchange medium flow path 12. 16 is formed.

  The groove width l of the heat exchange groove 11 in the direction perpendicular to the flow direction of the heat medium and along the inner peripheral surface of the jacket 10 is designed to be substantially equal from the supply port 13 to the discharge port 14. The groove width l is designed to be substantially equal to the dimension m of the supply port 13 and the dimension n of the discharge port 14. That is, the heat exchange groove 11 is formed so as to maintain a constant flow path width from the supply port 13 to the discharge port 14. Therefore, the heat exchange medium can be prevented from staying in the flow path 12.

  Here, the “constant flow path width” is not limited to the case where the flow path width does not change at all from the supply port 13 to the discharge port 14, and the flow path width changes so as not to cause the heat exchange medium to stay. including.

  FIG. 5 is a development view of the inner peripheral surface of the jacket 10 in which the heat exchange medium is likely to stay. Specifically, it is a diagram in the case where the groove width l changes abruptly as compared with the dimension m of the supply port 13, the dimension n of the discharge port 14, and the like. The heat exchange medium supplied from the supply port 13 flows along the direction of the white arrow shown in the figure. At this time, the heat exchange medium may stay in a part of the heat exchange groove 11. Further, in the injection molding machine, the screw shaft 4 (FIGS. 2 and 3) rotates. As the screw shaft 4 rotates, the flow of the heat exchange medium tends to be disturbed, and the heat exchange medium is likely to stay. When the number of staying places where such a heat exchange medium does not flow increases, the heat exchange efficiency between the screw shaft 4 and the heat exchange medium decreases.

  In this embodiment, as shown in FIG. 4, it is designed to maintain a constant flow path width from the supply port 13 to the discharge port 14. As a result, retention of the heat exchange medium in the heat exchange groove 11 can be suppressed.

  Further, the heat exchange groove 11 is arranged in the circumferential direction of the screw shaft 4 while being folded back within a predetermined range in the axial direction of the screw shaft 4. By forming the flow path 12 along the axial direction of the screw shaft 4, heat exchange can be performed in the axial direction of the screw shaft 4, and temperature deviation in the axial direction of the screw shaft 4 can be reduced. Become.

  Next, operations of the screw temperature adjusting device 9 and the injection molding machine in the present embodiment will be described with reference to FIGS.

  A solid resin material is put into the cylinder 1 from the hopper 6 in a state where the cylinder 1 is set to 200 ° C. to 300 ° C. using the heater 7. In order to prevent melting of the resin material in the vicinity of the hopper 6, the hopper flange 8 is kept at 40 ° C to 80 ° C.

  The temperature of the resin material charged into the cylinder 1 varies depending on the resin material that needs to be dried before being charged into the cylinder 1 and the resin material that does not need to be dried. In the resin material that needs to be dried, the resin material is heated to 80 ° C. to 120 ° C., and the moisture is removed. The resin material that does not need to be dried is charged at a temperature of 10 ° C. to 30 ° C. that is substantially equal to the atmospheric temperature.

  The temperature of the screw 2 varies depending on the temperature of the cylinder 1, the hopper flange 8, the resin material charged into the cylinder 1, and the like.

  In the screw temperature adjusting device 9 in this embodiment, the heat exchange medium is directly applied to the screw shaft 4 to exchange heat between the screw 2 and the heat exchange medium. Therefore, the temperature responsiveness of the screw 2 is higher than that of a screw temperature adjusting device (for example, Patent Document 2) in which the heat exchange medium is not directly applied to the screw 2. Further, since the heat exchange groove 11 is designed so that the heat exchange medium does not stay in the heat exchange groove 11, the heat exchange efficiency between the screw 2 and the heat exchange medium is caused to stay. Compared to higher. Therefore, the temperature fluctuation of the screw 2 can be further reduced.

  By maintaining the temperature of the screw 2 at a predetermined temperature, the size of the frictional resistance between the screw 2 and the resin material can be set to a desired size. As a result, the resin material can be efficiently moved toward the injection port 3 of the cylinder 1. The desired temperature varies depending on the type of resin material used.

  Since the heat exchange medium flow path 12 of the screw temperature adjusting device 9 in the present embodiment is obtained by forming the heat exchange groove 11 on the inner peripheral surface of the jacket 10, the screw temperature adjusting device can be processed relatively easily. 9 can be provided.

(Example 2)
Next, the screw temperature adjusting device 9 in the second embodiment of the present invention will be described. The injection molding machine to which the screw temperature adjusting device 9 in the second embodiment can be applied includes the cylinder 1, the screw 2, the hopper 6, and the hopper flange 8 as in the first embodiment, and the screw temperature adjusting device. 9 is provided on the screw shaft 4 (see FIG. 1).

  FIG. 6 is a cross-sectional view when the screw temperature adjusting device 9 of the injection molding machine according to the second embodiment of the present invention is cut along a plane parallel to the rotation axis of the screw 2. FIG. 7 is a cross-sectional view when the screw temperature adjusting device 9 shown in FIG. 6 is cut along a plane (plane BB shown in FIG. 6) that intersects the rotation axis of the screw 2 perpendicularly.

  As shown in FIGS. 6 and 7, the screw temperature adjusting device 9 covers a first jacket 17 provided to cover the outer peripheral surface of the screw shaft 4 and an outer peripheral surface of the first jacket 17. And a second jacket 18 provided on the head. A heat exchange groove 11 for flowing a heat exchange medium is formed on the inner peripheral surface of the first jacket 17. That is, a region surrounded by the wall surface of the heat exchange groove 11 and the outer peripheral surface of the screw shaft 4 is the flow channel 12 of the heat exchange medium.

  A supply port 13 and a discharge port 14 communicating with the heat exchange groove 11 are formed on the outer peripheral surface of the first jacket 17. Therefore, the heat exchange medium supplied from the supply port 13 is discharged from the discharge port 14 through the heat exchange groove 11. The supply port 13 and the discharge port 14 are formed at different positions in the axial direction of the screw 2.

  The first jacket 17 is provided so as to be capable of rotating along with the rotation of the screw shaft 4. A seal member 15 for preventing leakage of the heat exchange medium is provided on both outer sides of the inner circumferential surface of the first jacket 17 with respect to the heat exchange groove 11 in the axial direction of the screw 2.

  A supply groove 19 for supplying a heat exchange medium to the supply port 13 is formed on the inner peripheral surface of the second jacket 18. The supply groove 19 is formed in the inner peripheral surface of the second jacket 18 in a region through which the supply port 13 passes when the first jacket 17 rotates. That is, the supply groove 19 is formed so as to go around the inner peripheral surface of the second jacket 18.

  When the first jacket 17 moves in the axial direction of the screw 2 along with the screw 2, the width of the supply groove 19 in the axial direction is set to the expected movement distance of the first jacket 17 in the axial direction. Keep as much as. Thereby, the supply port 13 can always receive the heat exchange medium from the supply groove 19.

  Similarly, a discharge groove 20 that receives the heat exchange medium from the discharge port 14 is formed on the inner peripheral surface of the second jacket 18 in a region where the first jacket 17 rotates and the discharge port 14 passes. . Since the supply port 13 and the discharge port 14 are formed at different positions in the axial direction of the screw 2, the supply groove 19 and the discharge groove 20 are also formed at different positions in the axial direction of the screw 2.

  When the first jacket 17 moves in the axial direction of the screw 2 along with the screw 2, the supply port 13 in the axial direction of the screw 2 is considered in consideration of the movement distance of the first jacket 17 in the axial direction. What is necessary is just to design the distance with the discharge port 14 apart.

  An outer supply port 21 and an outer discharge port 22 communicating with the supply groove 19 and the discharge groove 20 are formed on the outer peripheral surface of the second jacket 18. The outer supply port 21 and the outer discharge port 22 are connected to a heat exchange medium control device (not shown) that adjusts the flow rate and temperature of the heat exchange medium.

  Seal members 15 for preventing the heat exchange medium from leaking are provided on the inner peripheral surface of the second jacket 18 on both outer sides of the supply groove 19 and the discharge groove 20 in the axial direction of the screw 2. By providing the seal member 15, the screw 2 and the first jacket 17 can be rotated without the heat exchange medium leaking from the gap between the first jacket 17 and the second jacket 18.

  A separate fixed seal member is provided between the supply groove 19 and the discharge groove 20 on the inner peripheral surface of the second jacket 18 to suppress the movement of the heat exchange medium between the supply groove 19 and the discharge groove 20. Also good.

  The second jacket 18 is fixed to the main body of the injection molding machine so that it does not rotate. Even if the first jacket 17 rotates with the screw 2, the supply groove 19 and the heat exchange groove 11 are always in communication, and the discharge groove 20 and the heat exchange groove 11 are always in communication. The supply and discharge of the heat exchange medium can be performed continuously.

  The heat exchange groove 11 is designed so that the heat exchange medium does not stay in the same manner as the heat exchange groove 11 (see FIG. 4) formed on the inner peripheral surface of the jacket 10 of the first embodiment.

  In the screw temperature adjusting device 9 in this embodiment, the heat exchange medium is directly applied to the screw shaft 4 to exchange heat between the screw 2 and the heat exchange medium. Therefore, the temperature responsiveness of the screw 2 is higher than that of a screw temperature adjusting device (for example, Patent Document 2) in which the heat exchange medium is not directly applied to the screw 2. In addition, since the heat exchange groove 11 is designed so that the heat exchange medium 11 does not stay in the heat exchange groove 11, the heat exchange efficiency between the screw 2 and the heat exchange medium is longer than that in the case where the heat exchange efficiency occurs. Become higher. Therefore, the temperature fluctuation of the screw 2 can be further reduced.

  By maintaining the temperature of the screw 2 at a predetermined temperature, the size of the frictional resistance between the screw 2 and the resin material can be set to a desired size. As a result, the resin material can be efficiently moved toward the injection port 3 of the cylinder 1. The desired temperature varies depending on the type of resin material used.

  Since the heat exchange medium flow path 12 of the screw temperature adjusting device 9 in the present embodiment is obtained by forming the heat exchange groove 11 on the inner peripheral surface of the jacket 10, the screw temperature adjusting device can be processed relatively easily. Can be provided.

  Further, in the present embodiment, the first jacket 17 rotates as the screw 2 rotates. That is, since wear occurs between the first jacket 17 and the second jacket 18 that can be replaced relatively easily compared to when the screw 2 is replaced, it is possible to reduce the time for parts replacement due to wear. it can. Further, since the first and second jackets 17 and 18 can be manufactured at a lower cost than the screw 2, it is possible to reduce the cost of replacement parts.

  This embodiment is suitable when wear of the screw shaft 4 is expected.

  In the first and second embodiments, the heat exchange groove 11 is arranged in the circumferential direction of the screw shaft while being folded back within a predetermined range in the axial direction of the screw 2 as shown in FIG. However, the shape is not limited to this shape as long as the shape is a flow path that does not cause retention of the heat exchange medium. For example, the heat exchange groove 11 may be formed in a spiral shape on the outer peripheral surface of the screw shaft 4.

2 Screw 4 Screw shaft 5 Blade 9 Screw temperature adjusting device 10 Jacket 11 Heat exchange groove 12 Flow path 13 Supply port 14 Discharge port 17 First jacket 18 Second jacket 19 Supply groove 20 Discharge groove

Claims (3)

A screw temperature adjusting device of an injection molding machine for adjusting the temperature of a screw using a heat exchange medium,
A first jacket covering the outer peripheral surface of the screw shaft of the screw;
A flow path for flowing the heat exchange medium formed by a groove formed on an inner peripheral surface of the first jacket and an outer peripheral surface of the screw shaft,
The flow path is for supplying the heat exchange medium to the groove from the outer peripheral surface of the first jacket, and for discharging the heat exchange medium from the groove to the outer peripheral surface of the first jacket. And an outlet for
The groove is formed so as to maintain a constant flow path width from the supply port to the discharge port , and is disposed in the circumferential direction of the screw shaft while being folded back in a predetermined range in the axial direction of the screw shaft . , Screw temperature adjusting device for injection molding machine. The first jacket is rotatably provided with the rotation of the screw;
A second jacket covering the outer peripheral surface of the first jacket;
The supply port and the discharge port are provided at different positions in the axial direction of the screw;
The second jacket supplies the heat exchange medium to the supply port in a region of the inner peripheral surface of the second jacket through which the supply port and the discharge port pass when the first jacket rotates. The screw temperature adjusting device for an injection molding machine according to claim 1, further comprising a discharge groove for receiving the heat exchange medium from a supply groove and the discharge port. A screw temperature adjusting device of an injection molding machine for adjusting the temperature of a screw using a heat exchange medium,
A first jacket covering the outer peripheral surface of the screw shaft of the screw;
A flow path for flowing the heat exchange medium formed by a groove formed on an inner peripheral surface of the first jacket and an outer peripheral surface of the screw shaft;
A second jacket covering the outer peripheral surface of the first jacket,
The flow path is for supplying the heat exchange medium to the groove from the outer peripheral surface of the first jacket, and for discharging the heat exchange medium from the groove to the outer peripheral surface of the first jacket. And an outlet for
The groove is formed so as to maintain a constant flow path width from the supply port to the discharge port,
The first jacket is rotatably provided with the rotation of the screw;
The supply port and the discharge port are provided at different positions in the axial direction of the screw;
The second jacket supplies the heat exchange medium to the supply port in a region of the inner peripheral surface of the second jacket through which the supply port and the discharge port pass when the first jacket rotates. A screw temperature adjusting device for an injection molding machine, comprising a supply groove and a discharge groove for receiving the heat exchange medium from the discharge port.

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