JP2008213400A - Cooling mechanism of heating tube of injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling mechanism of a heating tube of an injection molding machine effectively and rapidly cooling the heating tube heated to a high temperature. <P>SOLUTION: The cooling mechanism B of the heating tube of the injection molding machine for cooling the heating tube 7 has a heating tube main body 10 having an injection nozzle 6 mounted at the tip end 10a and supported by a forward and backward movable injection unit 5 connected to the rear end 10b, and a heater 11 mounted on the outer circumference of the heating tube main body 10, wherein the cooling mechanism has a cooling water jacket 21 provided at the outer circumference of the heating tube 7 and for cooling the heating tube 7 with the cooling water circulated in a hollow part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heating cylinder cooling mechanism of an injection molding machine.

  2. Description of the Related Art Conventionally, an injection molding machine clamps a mold with a mold clamping device that opens and closes a pair of molds and molds by moving a movable plate that holds the other mold forward and backward with respect to a fixed plate that holds one mold. An injection device that injects a molding material such as a molten resin into the cavities of the pair of molds is configured. The injection device includes a heating cylinder having an injection nozzle for injecting a molding material at the tip, and an injection unit provided so as to be able to advance and retreat in a state where the rear end of the heating cylinder is connected and supported. Has been.

  Furthermore, the heating cylinder is provided so as to cover the outer periphery of the heating cylinder main body to which a solid molding material is supplied, for example, via a hopper, and the injection nozzle attached to the tip of the heating cylinder main body or the heating cylinder main body. Equipped with a heater. In this heating cylinder, the heating cylinder main body and the injection nozzle are heated to a high temperature of, for example, several hundred degrees Celsius by the heater, and the supplied solid molding material is inserted into the heating cylinder main body so as to be able to advance and retreat and to rotate around the axis. Melt with stirring with a screw. The molten molding material is injected with the advance of the screw from the injection nozzle that is in contact with the mold by the advance of the injection unit, and is filled in the cavities of the pair of molds.

On the other hand, for example, at the time of switching from a molding material that melts at a high temperature to a molding material that has a low melting temperature or maintenance of a heating cylinder or the like, it is necessary to cool (lower the temperature) the heating cylinder. At this time, if the heating cylinder heated to a high temperature is cooled by natural heat dissipation, a very long time is required until the heating cylinder is cooled to a desired temperature, and the production efficiency is remarkably lowered. For this reason, for example, the injection molding machine disclosed in Patent Document 1 includes a blower, an air nozzle, or the like, and blows air to the outer peripheral side of the heating cylinder at the time of switching or maintenance of the molding material. The heating cylinder is cooled efficiently.
Japanese Utility Model Publication No. 2-41922

  However, as disclosed in Patent Document 1, even when the heating cylinder is cooled using a blower such as a blower or an air nozzle, the cooling efficiency of the heating cylinder heated to a high temperature is low, and the desired temperature is reached. From the point that it takes a lot of time to cool down and improves productivity, there is a strong demand for measures that can be cooled more efficiently and quickly.

  In view of the above circumstances, an object of the present invention is to provide a heating cylinder cooling mechanism of an injection molding machine capable of efficiently and quickly cooling a heating cylinder heated to a high temperature.

  In order to achieve the above object, the present invention provides the following means.

  The heating cylinder cooling mechanism of the injection molding machine according to the present invention is provided with a heating cylinder main body supported by connecting an injection unit provided with an injection nozzle at the front end and capable of advancing and retreating the rear end back and forth, and on the outer periphery of the heating cylinder main body. A heating cylinder cooling mechanism of an injection molding machine for cooling a heating cylinder provided with a heated heater, the cooling cylinder being provided on the outer peripheral side of the heating cylinder and cooling the heating cylinder with cooling water flowing through a hollow portion A cooling water jacket is provided.

  In the present invention, the heating cylinder heated to a high temperature can be efficiently and quickly cooled by using the cooling water having a specific heat and thermal conductivity larger than that of air and a remarkably large heat capacity as the refrigerant.

  Moreover, in the heating cylinder cooling mechanism of the injection molding machine of this invention, it is desirable to provide the ventilation mechanism which blows cooling air on the outer peripheral side of the said heating cylinder.

  In the present invention, by using cooling water and air (cooling air) together as a refrigerant, the heating cylinder heated to a high temperature can be cooled more efficiently and quickly.

  Further, in the heating cylinder cooling mechanism of the injection molding machine according to the present invention, the cooling water is supplied to the cooling water jacket, and after the heating cylinder is cooled to a desired temperature, the cooling water jacket is inserted into the hollow portion of the cooling water jacket. It is more desirable to provide a cooling water supply / discharge mechanism that supplies air to discharge the cooling water in the hollow portion to the outside.

  In the present invention, after the heating cylinder is cooled to a desired temperature, the cooling water remaining in the cooling water jacket can be removed to the outside. As a result, when the injection molding operation is restarted and the heating cylinder is heated again, it is possible to reliably prevent the cooling water remaining in the cooling water jacket from evaporating and causing damage to the cooling water jacket due to the vapor pressure. .

  In the heating cylinder cooling mechanism of the injection molding machine of the present invention, a plurality of the heaters are arranged in parallel with a gap in the axial direction of the heating cylinder, and the cooling water jacket is disposed at least in the gap. More desirable.

  In the present invention, a plurality of heaters are arranged in parallel with a gap in the axial direction of the heating cylinder, and the heating cylinder main body exposed in the gap can be directly cooled by the cooling water jacket. Thereby, cooling of a heating cylinder main body can be performed efficiently.

  Furthermore, in the heating cylinder cooling mechanism of the injection molding machine according to the present invention, a plurality of the cooling water jackets are arranged in parallel in the axial direction, and the cooling water jackets adjacent in the axial direction mutually form the hollow portions. It is desirable that they are connected via a communication pipe for communication.

  In this invention, since the cooling water jackets adjacent in the axial direction are connected through the connecting pipe, the cooling water supplied to one cooling water jacket can be distributed to the other cooling water jackets. As a result, the cooling water having a large heat capacity can be circulated along the outer periphery of the heating cylinder for a long time while sequentially absorbing heat from the heating cylinder, so that the heating cylinder can be cooled more efficiently.

  According to the heating cylinder cooling mechanism of the injection molding machine of the present invention, for example, when switching from a molding material that melts at a high temperature to a molding material having a low melting temperature or during maintenance of the heating cylinder, the heating cylinder is reliably and efficiently Since it can cool to a desired temperature at an early stage, the time for stopping the operation of the injection molding machine by switching the molding material and performing maintenance at an early stage can be shortened. This makes it possible to improve productivity.

  Hereinafter, the heating cylinder cooling mechanism of the injection molding machine according to the first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, for example, when switching from a molding material that melts at a high temperature to a molding material having a low melting temperature, or during maintenance of a heating cylinder, the heating cylinder can be efficiently and quickly cooled to a desired temperature. The present invention relates to a heating cylinder cooling mechanism of an injection molding machine.

  The injection molding machine A of the present embodiment is a so-called horizontal injection molding machine, and as shown in FIG. 1, a stationary platen 1 erected in the vertical direction and one side (that is, sandwiching the stationary platen 1 (that is, The injection device 2 provided on the one side 1a facing the horizontal direction of the fixed platen 1) and the other side of the fixed platen 1 (that is, the other surface 1b side facing the horizontal direction of the fixed platen 1). A mold clamping device (not shown) is provided. The stationary platen 1 constitutes a part of the mold clamping device. The fixed platen 1 is fixedly connected with the lower end 1c to the machine body 3, and a nozzle insertion port 1d penetrating from one surface 1a to the other surface 1b is formed at a substantially vertical center. Further, on the other surface 1b side of the stationary platen 1, a mold holding portion 1e is provided at the substantially vertical center, and the fixed side die K1 is attached to the mold holding portion 1e. In the fixed mold K1, the movable plate K2 held by the movable plate is clamped or molded by moving the movable plate of the mold clamping device back and forth (horizontal direction) with respect to the fixed plate 1. Opened.

  The injection device 2 includes an injection unit 5 and an unillustrated forward / backward drive mechanism having, for example, a screw mechanism for moving the injection unit 5 forward and backward (horizontal direction) with respect to the fixed platen 1. It is configured. The injection unit 5 is provided with a heating cylinder 7 provided with an injection nozzle 6 at the tip and arranged with the axis O1 direction in the horizontal direction, connecting the rear ends thereof. Thus, the heating cylinder 7 provided in the injection unit 5 moves forward and backward in the direction of the axis O1 (horizontal direction) together with the injection unit 5 by driving of the advance / retreat drive mechanism.

  Here, as shown in FIG. 2, the heating cylinder 7 of the present embodiment includes a substantially cylindrical heating cylinder body 10, and a plurality of heating cylinder bodies 10 provided to cover the outer periphery of the heating cylinder body 10 and the outer periphery of the injection nozzle 6. A heater (heater band) 11 is provided. The plurality of heaters 11 attached to the outer periphery of the heating cylinder main body 10 are spaced at a predetermined interval in the direction of the axis O1 from the front end 10a side to which the injection nozzle 6 of the heating cylinder main body 10 is connected to the rear end 10b side to which the injection unit 5 is connected. (Gap H) is provided in parallel.

  2 and 3, the heating cylinder 7 is partitioned into a plurality of heating units. In this embodiment, the heating cylinder 7 is from the front end 10a side in the axis O1 direction (the rear end side of the injection nozzle 6) to the rear end 10b side. The first heating unit 12, the second heating unit 13, the third heating unit 14, the fourth heating unit 15, and the fifth heating unit 16 are partitioned in that order. The first heating unit 12 is a range in which the heater 11 (11a) on the rear end side of the injection nozzle 6 is provided, and the second heating unit 13 is adjacent to the rear end side heater 11a of the injection nozzle 6 in the direction of the axis O1. In a range where one heater 11 (11b) on the front end 10a side of the cylinder body 10 is provided, the third heating unit 14 is adjacent to the heater 11 adjacent to the rear end 10b side in the axis O1 direction of the second heating unit 13 (this embodiment). In the range where the four heaters 11c) are provided, the fourth heating unit 15 is provided with the heaters 11 (four heaters 11d in the present embodiment) adjacent to the rear end 10b side of the third heating unit 14 in the axis O1 direction. The fifth heating unit 16 is a range in which one heater 11 (11e) adjacent to the rear end 10b of the fourth heating unit 15 in the axis O1 direction is provided.

  Furthermore, as shown in FIG. 3, a plurality of temperature sensors 20 are attached to the heating cylinder 7, and in this embodiment, six temperature sensors 20 are attached. Of these, two temperature sensors 20 a and 20 b are attached to the front end side and the rear end side of the injection nozzle 6, respectively. Moreover, the temperature of these heating parts 13, 14, 15, and 16 is detected in the approximate center of each axis O1 direction of the 2nd heating part 13, the 3rd heating part 14, the 4th heating part 15, and the 5th heating part 16, respectively. The temperature sensors 20c to 20f are attached one by one as possible. The temperature sensors 20b, 20c, 20f (20) provided in the first heating unit 12, the second heating unit 13, and the fifth heating unit 16 are heaters 11a, 11b, 11e of the heating units 12, 13, 16 respectively. The temperature sensors 20d and 20e (20) provided in the third heating unit 14 and the fourth heating unit 15 are substantially in the center of the axis O1 direction of (11), and a gap H portion between the heaters 11c and 11d adjacent in the axis O1 direction. Is attached.

  Further, as shown in FIGS. 3 and 4, the heating cylinder 7 of the present embodiment cools the high-temperature heating cylinder 7 (the heating cylinder main body 10 and the heater 11), for example, at the time of switching the molding material or during maintenance. The heating cylinder cooling mechanism B is attached. In the present embodiment, the heating cylinder cooling mechanism B is attached to the third heating unit 14 and the fourth heating unit 15, respectively, and includes a first water cooling mechanism B1 and a second water cooling mechanism B2 that cool the heating units 14 and 15, respectively. I have. Moreover, these 1st and 2nd water cooling mechanisms B1 and B2 are provided with the some cooling water jacket 21 each arrange | positioned in the clearance gap H of the heaters 11c and 11d adjacent to an axis O1 direction. Furthermore, each cooling water jacket 21 is formed to include a pair of upper and lower upper cooling water jackets 22 and 23 formed in a substantially C-shaped plate shape in plan view and formed in a hollow structure. Yes.

  Then, the upper cooling water jacket 22 brings the inner peripheral edge 22a having a concave arc shape into contact with the outer peripheral surface (the outer peripheral side of the heating cylinder 7) on the upper side of the heating cylinder main body 10 exposed in the gap H and the outer peripheral edge. 22 b is provided so as to protrude outward (upward) in the direction orthogonal to the axis O <b> 1 of the heating cylinder 7. The lower cooling water jacket 23 has a concave arc-shaped inner edge 23a in contact with the lower outer peripheral surface (the outer peripheral side of the heating cylinder 7) of the heating cylinder body 10, and the outer edge 23b is orthogonal to the axis O1. It protrudes outward in the direction (downward side). Further, in the first water cooling mechanism B1 and the second water cooling mechanism B2, the upper cooling water jackets 22 of the cooling water jackets 21 adjacent to each other in the direction of the axis O1 are connected to each other by a first communication pipe (communication pipe) 24. The hollow portions on the upper end side are communicated with each other through the first communication pipe 24. Further, the lower cooling water jackets 23 of the cooling water jackets 21 adjacent to each other in the direction of the axis O1 are also connected by the second communication pipe (communication pipe) 25, and the hollow portions on the lower end sides of the cooling water jackets 23 connect the second communication pipe 25 with each other. It is communicated through. Each cooling water jacket 21 is attached with a substantially U-shaped third communication pipe 26 that communicates the hollow portions of the pair of upper cooling water jacket 22 and lower cooling water jacket 23. The third communication pipe 26 has one end connected to the lower end side of the upper cooling water jacket 22 and the other end connected to the upper end side of the lower cooling water jacket 23, and the heaters 11 c and 11 d adjacent to the tip 10 a side of the heating cylinder 7. Projection is provided up to the center of the axis O1 direction of (11).

  Further, each cooling water jacket 21 provided on the rearmost side of each of the first and second water cooling mechanisms B1 and B2 (on the rear end 10b direction of the heating cylinder 7 in the direction of the axis O1) includes a hollow portion of the upper cooling water jacket 22. One end is connected to the upper end side of the upper cooling water jacket 22 so as to communicate with the portion, and the other end communicates with the drain pipe 27 extending toward the rear end 10b side in the axis O1 direction and the hollow portion of the lower cooling water jacket 23. One end is connected to the lower end side of the lower cooling water jacket 23, and the other end is attached with a water supply pipe 28 extending toward the rear end 10b side in the axis O1 direction.

  Further, as shown in FIG. 5, the first water cooling mechanism B1 and the second water cooling mechanism B2 are supplied with cooling water W to the water supply pipe 28 and are cooled through the second and third communication pipes 25 and 26, respectively. While supplying the cooling water supply mechanism 30 for supplying the cooling water W to the water jacket (hollow part of each cooling water jacket 21) 21, the air S is supplied to the water supply pipe 28, and the second and third communication pipes 25, 26 are provided. In order to discharge the cooling water W in each cooling water jacket 21 to the outside through the first communication pipe 24 and the drain pipe 27 by circulating the air S through the cooling water jackets 21 (hollow portions of the respective cooling water jackets 21). The cooling water removal mechanism 31 is connected. The cooling water supply mechanism 30 and the cooling water removal mechanism 31 constitute the cooling water supply / discharge mechanism of the present embodiment.

  In the present embodiment, the cooling water supply mechanism 30 is connected to the water storage tank 32 storing the cooling water W, the first pipe 33 having one end connected to the water supply pipe 28, and the other end of the first pipe 33. A water supply means 34 such as a pump for supplying the cooling water W in the water storage tank 32 to the supply pipe 28 via the pipe 33, a first switching valve 35 such as an electromagnetic valve for opening and closing the first pipe 33, and one end thereof The drain pipe 27 is connected to the water storage tank 32 at the other end, and a second pipe 36 for collecting the cooling water W discharged from the drain pipe 27 into the water storage tank 32 and a solenoid valve for opening and closing the second pipe 36, for example. And a second switching valve 37. The cooling water supply mechanism 30 is not necessarily limited to the above-described configuration. For example, tap water (cooling water W) is directly supplied from the tap by connecting the other end of the first pipe 33 to the tap water tap. The waste water W flowing through the second pipe 36 may be discharged to the outside such as a side groove without being collected by the water storage tank 32. In addition, a heat exchanger or the like may be interposed between the water supply means 34 or the faucet and the first switching valve 35 to adjust the temperature of the cooling water W supplied to the water supply pipe 28.

  On the other hand, the cooling water removing mechanism 31 is provided such that, for example, an air supply means 38 such as a compressor and one end are connected to the supply pipe 28 side with respect to the first switching valve 35 of the first pipe 33 to branch the first pipe 33. The third pipe 39 whose other end is connected to the air supply means 38, the third switching valve 40 such as an electromagnetic valve for opening and closing the third pipe 39, and the one end draining more than the second switching valve 37 of the second pipe 36. A fourth pipe 41 connected to the pipe 27 side so as to branch the second pipe 36 and having the other end arranged outside such as a side groove, and a fourth switching such as an electromagnetic valve that opens and closes the fourth pipe 41. And a valve 42. In the present embodiment, the water supply means 34, the first switching valve 35, and the second switching valve 37 of the cooling water supply mechanism 30, the air supply means 38, the third switching valve 40, and the fourth of the cooling water removal mechanism 31 are used. A control device (not shown) is connected to the switching valve 42 and each temperature sensor 20. For example, based on the switch operation of the control device and the detection result of each temperature sensor 20, the control device causes the water supply means 34, the air supply means 38, and the first to fourth switching valves 35, 37, 40, 42, respectively. Is controlled.

  3 to 5, the heating cylinder 7 is covered with the cooling water jacket 21 with the upper cover 43 from the upper side and the lower cover 44 from the lower side across the axis O1, that is, the upper cover. 43 and the lower cover 44 cover the heating cylinder body 10, the heater 11, the temperature sensor 20, the cooling water jacket 21, and the like, and are accommodated therein. Further, as shown in FIGS. 2 and 3, a screw 45 for injecting a molding material from the injection nozzle 6 from the rear end 10 b side is inserted into the heating cylinder body 10 of the heating cylinder 7.

  Next, a method for cooling the high-temperature heating cylinder 7 by the heating cylinder cooling mechanism B of the injection molding machine A having the above-described configuration will be described, and the operation and effect of the heating cylinder cooling mechanism B of the injection molding machine A of the present embodiment will be described. explain.

  First, when injection molding is performed using the injection molding machine A having the above-described configuration, the injection unit 5 is moved forward after the fixed side mold K1 and the movable side mold K2 are clamped by the mold clamping device. The nozzle 6 is brought into contact with the stationary mold K1 through a nozzle insertion port 1d of the fixed platen 1 with a predetermined pressing force. At this time, a molding material such as a solid resin is put into the heating cylinder main body 10 from a hopper or the like attached to the rear end 10 b side of the heating cylinder 7. Then, the heating cylinder 7 (heating cylinder main body 10) is heated by the heater 11 at a temperature exceeding 300 ° C., for example, and the molding material is melted in the heating cylinder main body 10 together with this and the screw 45 inserted into the heating cylinder main body 10 is driven. Is injected from the injection nozzle 6. As a result, the melted molding material is filled into the cavities of the pair of molds K1 and K2 that have been clamped.

  On the other hand, for example, when switching from a molding material having a melting temperature above 300 ° C. to a molding material having a melting temperature of 250 ° C. or when performing maintenance on the heating cylinder 7 or the like, it is necessary to cool the heating cylinder 7. is there. In the present embodiment, for example, when an operator performs a switch operation of the control device, an operation command is issued from the control device to the water supply means 34, the first switching valve 35, and the second switching valve 37 of the cooling water supply mechanism 30, and the water supply The means 34 starts driving, and the first switching valve 35 and the second switching valve 37 open the first pipe 33 and the second pipe 36. Thereby, the cooling water W in the water storage tank 32 is supplied to the cooling water jacket 21 through the water supply pipe 28. At this time, the supplied cooling water W is sent to the lower cooling water jackets 23 of all the cooling water jackets 21 through the second communication pipes 25, and the air in the cooling water jackets 21 is discharged from the drain pipes 27 in order. The cooling water W flows through the third communication pipe 26, the upper cooling water jacket 22, and the first communication pipe 24, and this cooling water W flows from the supply pipe 28 toward the drain pipe 27. Here, in the present embodiment, the cooling water W is supplied from the lower side to the upper side, so that the cooling water jacket 21 can be surely filled into the cooling water jacket 21 without causing air accumulation or the like. Circulate.

  In this way, the cooling water W circulates, the cooling water jacket 21 is lowered in temperature, and the heat of the high-temperature heating cylinder body 10 and the heater 11 is absorbed by the cooling water jacket 21 (circulating cooling water W). At this time, as compared with the conventional case where air is blown to the heating cylinder 7 and cooled, the cooling water W having a specific heat and thermal conductivity larger than that of air and having a much larger heat capacity is used as a refrigerant as in the present embodiment. By using it, the heating cylinder 7 heated to a high temperature is efficiently and quickly cooled. Further, the cooling water jacket 21 is provided by bringing the inner edge portions 22a and 23a of the upper cooling water jacket 22 and the lower cooling water jacket 23 into contact with the heating cylinder body 10 exposed in the gap H between the adjacent heaters 11, and Since the heaters 11 c and 11 d are sandwiched between the cooling water jackets 21, the heat of the high-temperature heating cylinder body 10 is reliably and efficiently absorbed by the cooling water W flowing through the cooling water jacket 21. Further, since the cooling water W is sequentially distributed and supplied in the plurality of cooling water jackets 21, that is, the contact time between the cooling water W having a low heat capacity and a large heat capacity and the high-temperature heating cylinder 7 becomes long. Also from the point, the heat of the heating cylinder body 10 is absorbed reliably and efficiently.

  Then, at the stage where it is confirmed that the heating cylinder 7 has been cooled to the desired temperature efficiently and early by the cooling water W, the water supply means of the cooling water supply mechanism 30 from the control device based on the detection result of the temperature sensor 20. 34, the first switching valve 35, and the second switching valve 37 are commanded to stop the water supply means 34, and the first switching valve 35 and the second switching valve 37 are connected to the first piping 33 and the second piping. 36 is closed. At the same time, an operation command is issued from the control device to the air supply means 38, the third switching valve 40, and the fourth switching valve 42 of the cooling water removing mechanism 31, and the air supply means 38 starts driving, and the third switching valve. 40 and the fourth switching valve 42 open the third pipe 39 and the fourth pipe 41. As a result, the air S sent from the air supply means 38 is supplied to the cooling water jacket 21 through the supply pipe 28. At this time, the supplied air S is sent to the lower cooling water jackets 23 of all the cooling water jackets 21 through the second communication pipes 25, and the cooling water W in the cooling water jackets 21 is discharged from the drain pipes 27 sequentially. The third communication pipe 26, the upper cooling water jacket 22 and the first communication pipe 24 circulate. Then, the cooling water W sequentially discharged from the drain pipe 27 is discharged to the outside through the fourth pipe 41, and when the cooling water W is not discharged from the fourth pipe 41, that is, the air S flowing through the cooling water jacket 21. Is exhausted from the fourth pipe 41, all the cooling water jackets 21 and the first to third communication pipes 24, 25, and 26 (in the first water cooling mechanism B1 and the second water cooling mechanism B2). In addition, the air S is completely filled without the cooling water W remaining.

  Thus, when the injection molding is resumed by removing the cooling water W from the first water cooling mechanism B1 and the second water cooling mechanism B2, the first water cooling mechanism B1 and the second water cooling mechanism are accompanied by heating of the heating cylinder 7. The cooling water W evaporates in the hollow part of B2, and damage to the cooling water jacket 21 and the first to third communication pipes 24, 25, 26 and the like is reliably prevented by this vapor pressure.

  Therefore, in the heating cylinder cooling mechanism B of the injection molding machine A of the present embodiment, the heating cylinder heated to a high temperature by using the cooling water W having a specific heat and thermal conductivity larger than that of air as a refrigerant, which is much larger than the air. 7 can be efficiently and quickly cooled.

  In addition, after the heating cylinder 7 is cooled to a desired temperature, the first water cooling mechanism B1 and the second water cooling mechanism B2 (the cooling water jacket 21 and the first to the first water cooling mechanisms 21) are cooled by the cooling water supply / discharge mechanism (cooling water removal mechanism 31). The cooling water W remaining in the three communication pipes 24, 25, 26) can be removed to the outside. Thereby, when the injection molding operation is restarted and the heating cylinder 7 is heated again, the cooling water W remaining in the first water cooling mechanism B1 and the second water cooling mechanism B2 evaporates, and the cooling water jacket 21 is caused by the vapor pressure. Can be reliably prevented from being damaged.

  Furthermore, a plurality of heaters 11 are provided side by side with a gap H in the direction of the axis O <b> 1 of the heating cylinder 7, and the heating cylinder body 10 exposed in the gap H can be directly cooled by the cooling water jacket 21. Thereby, cooling of the heating cylinder main body 10 can be performed efficiently.

  Further, since the cooling water jackets 21 adjacent to each other in the direction of the axis O1 are connected through the first and second connecting pipes 24 and 25, the cooling water W supplied to one cooling water jacket 21 is supplied to the other cooling water jackets 21. It can be distributed. As a result, the cooling water W having a large heat capacity can be circulated along the outer periphery of the heating cylinder 7 for a long time while absorbing heat from the heating cylinder 7 in sequence, so that the heating cylinder 7 can be cooled more efficiently. Become.

  Therefore, according to the heating cylinder cooling mechanism B of the injection molding machine A of the present embodiment, for example, at the time of switching from a molding material that melts at a high temperature to a molding material having a low melting temperature, or at the time of maintenance of the heating cylinder 7 or the like, the heating cylinder 7 Can be efficiently and quickly cooled to the desired temperature, so that the time required to stop the operation of the injection molding machine A by switching and maintaining the molding material at an early stage can be shortened. Can be improved.

  In addition, this invention is not limited to said 1st Embodiment, In the range which does not deviate from the meaning, it can change suitably. For example, in this embodiment, the heating cylinder cooling mechanism B is configured by a first water cooling mechanism B1 and a second water cooling mechanism B2 attached to the third heating unit 14 and the fourth heating unit 15, respectively. However, for example, as shown in FIG. 6, a cooling water jacket 21 connected to the first water cooling mechanism B <b> 1 is also provided in the gap H between the first heating unit 12 and the second heating unit 13. The first heating unit 12 may also be cooled by the third communication pipe 26 of the jacket 21.

  In addition to this, it is not necessary to limit the heating cylinder cooling mechanism B to the first water cooling mechanism B1 and the second water cooling mechanism B2, and the first water cooling mechanism B1 and the second water cooling mechanism are not necessarily limited. B2 may be configured to communicate, and the cooling water W supplied from the supply pipe 28 may be circulated through all the cooling water jackets 21 to cool the heating cylinder 7. Furthermore, the heating cylinder cooling mechanism B may be configured with more water cooling mechanisms than in the present embodiment. In addition, each of the water cooling mechanisms B1 and B2 is provided with one supply pipe 28 and one drain pipe 27, but a plurality of supply pipes 28 and drain pipes 27 may be provided. That is, for one water cooling mechanism B1, B2, the cooling water W may be supplied from a plurality of locations, or the cooling water W circulated from the plurality of locations may be discharged. Can more reliably distribute the cooling water W throughout, and can further improve the cooling efficiency.

  Further, in the present embodiment, the cooling water jacket 21 is disposed in the gap H between the heaters 11 adjacent in the direction of the axis O1, but the cooling water jacket 21 is covered so as to cover each heater 11 (the heating cylinder 7). May be provided). In addition, although each cooling water jacket 21 is composed of an upper cooling water jacket 22 and a lower cooling water jacket 23 separated from each other through the third communication pipe 26, the respective hollow portions are communicated. The jacket 21 does not necessarily have to be formed separately in the upper part and the lower part, and may be constituted by a single cooling water jacket.

  Further, in this embodiment, the injection molding machine A is a horizontal injection molding machine, and the heating cylinder cooling mechanism B according to the present invention is applied to the heating cylinder 7 arranged with its axis O1 oriented in the horizontal direction. However, the heating cylinder cooling mechanism of the injection molding machine according to the present invention may be applied to the heating cylinder 7 of the vertical injection molding machine. In this case, since the heating cylinder 7 is provided with the axis O1 in the vertical direction, the supply pipe 28 is provided below the heating cylinder 7 (injection nozzle 6 side, tip 10a side), and the cooling water on the lower side is provided. The cooling water W is supplied from the jacket 21 so as to fill the hollow portion of the upper cooling water jacket 21 in order, and the cooling water W circulated from the lower side to the upper side is supplied to the upper side of the heating cylinder 7 (the injection unit 5 side, If it is made to discharge from the drain pipe 27 provided on the rear end 10b side), it is possible to obtain the same effect as this embodiment.

  Furthermore, in this embodiment, the 3rd piping 39 to which the air supply means 38 of the cooling water removal mechanism 31 is connected is connected to the 1st piping 33, the air S is supplied from the supply pipe 28 through this 1st piping 33, and cooling water is supplied. The cooling water W in the jacket 21 and the first to third communication pipes 24, 25, and 26 is discharged and removed from the drain pipe 27, and the removed cooling water W is connected to the drain pipe 27, the second pipe 36 and The cooling water removing mechanism 31 connects the third pipe 39 connected to the air supply unit 38 to the second pipe 36 and connects the fourth pipe 41 to the first pipe 33. May be configured. In this case, the air S sent from the air supply means 38 is supplied from the drain pipe 27, and at the same time, the cooling water in the cooling water jacket 21 and the first to third communication pipes 24, 25, and 26 is supplied from the supply pipe 28. W can be sequentially discharged and removed. Thus, the air S can be supplied (circulated) so as to push out the cooling water W in the cooling water jacket 21 and the first to third communication pipes 24, 25, and 26 from the upper side to the lower side. The cooling water W in the cooling water jacket 21 and the first to third communication pipes 24, 25, and 26 can be more reliably removed than pushing out upward from the bottom as in the embodiment. Therefore, when the injection molding is resumed, the remaining cooling water W evaporates as the heating cylinder 7 is heated, and the steam damages the cooling water jacket 21 and the first to third communication pipes 24, 25, and 26 due to this steam. Can be prevented more reliably.

  Next, the heating cylinder cooling mechanism of the injection molding machine according to the second embodiment of the present invention will be described with reference to FIG. As in the first embodiment, the present embodiment is a heating cylinder cooling mechanism of a horizontal injection molding machine that can cool the heating cylinder to a desired temperature efficiently and quickly, for example, at the time of switching molding materials or during maintenance. It is about. Therefore, here, the same reference numerals are given to the components common to the first embodiment, and the detailed description thereof is omitted.

  The heating cylinder cooling mechanism C of the present embodiment is configured by adding a blower mechanism E to the heating cylinder cooling mechanism B of the first embodiment shown in FIG. 6 as shown in FIG. That is, in the present embodiment, the heating cylinder cooling mechanism C is the cooling water W flowing through the second and third heating units 13 and 14 to the cooling water jacket 21 and the first to third communication pipes 24, 25 and 26. In addition to the first water cooling mechanism B1 for cooling and the second water cooling mechanism B2 for cooling the fourth heating unit 15 with the cooling water jacket 21 and the cooling water W flowing through the first to third communication pipes 24, 25, and 26. The first air-cooling mechanism E1, the second air-cooling mechanism E2, and the third air-cooling mechanism E3 that cool the air by blowing the cooling air R onto the second heating unit 13, the third heating unit 14, and the fourth heating unit 15, respectively. A blower mechanism E is provided.

  Each of the first to third air cooling mechanisms E1, E2, and E3 includes a blower (blower device) 50 and a rectifying plate 51 having a large number of through holes (not shown), for example. Among these, the first air-cooling mechanism E1 has a blower 50 attached to the front end of the first protrusion 44a formed in the lower cover 44 in the protrusion direction, and the first protrusion 44a is the second heating part of the lower cover 44. Of the portion covering 13, a portion excluding a part on the front end 10 a side and the rear end 10 b side in the axis O <b> 1 direction protrudes outward (downward) in the direction orthogonal to the axis O <b> 1. Further, the space M1 formed by the first projecting portion 44a is divided into the heater 11b side (the heating tube main body 10 and the second communication pipe 25 side of the first water cooling mechanism B1) and the blower 50 side, and the second One rectifying plate 51 is supported and provided on the first protrusion 44a so as to face the outer peripheral surface of the heater 11b of the heating unit 13. In the first air cooling mechanism E1, the cooling air R sent from the blower 50 into the space M1 of the first projecting portion 44a passes through the rectifying plate 51 and is rectified, and below the heater 11b of the second heating unit 13. It sprays from the side so as to be orthogonal to the outer peripheral surface. Thus, the cooling air R blown from the lower side to the heater 11b of the second heating unit 13 circulates upward in the space between the lower cover 44 and the upper cover 43 and the heater 11b. 2 The heat of the heating cylinder body 10 of the heating unit 13 is absorbed. The cooling air R that has absorbed heat from the heating cylinder body 10 of the second heating unit 13 and has risen in temperature passes through the upper cover 43 of the portion covering the second heating unit 13 and is not shown. It is discharged from the mouth to the outside.

  The second air cooling mechanism E2 has a blower 50 attached to the tip of a second protrusion 44b formed on the lower cover 44, and the second protrusion 44b covers the third heating part 14 of the lower cover 44. Of the portion, a portion excluding a part on the front end 10a side and the rear end 10b side in the axis O1 direction is formed to protrude outward in the direction orthogonal to the axis O1. In addition, a plurality of rectifying plates 51 (four in this embodiment) are provided so as to divide the space M2 formed by the second projecting portion 44b into the heater 11c side and the blower 50 side. At this time, the plurality of rectifying plates 51 of the first air cooling mechanism E2 are provided along the axis O1 and spaced in the direction of the axis O1, and one each for each of the four heaters 11c of the third heating unit 14. It arrange | positions so that it may oppose. The plurality of rectifying plates 51 have two end portions adjacent to each other that are connected to each other via a connecting member 52, and are arranged on the front end 10a side and the rear end 10b side in the direction of the axis O1. The end of the current plate 51 is connected to the second protrusion 44b. Thereby, the some baffle plate 51 is supported by the 2nd protrusion part 44b via the connection member 52. As shown in FIG. In the second air cooling mechanism E2, the cooling air R sent from the blower 50 into the space M2 of the second projecting portion 44b is rectified by the respective rectifying plates 51, and below the heaters 11c of the third heating unit 14. It sprays from the side so as to be orthogonal to the outer peripheral surface. At this time, since the cooling water jackets 21 are provided on both sides in the axis O1 direction of each heater 11c, the cooling air R blown from the lower side to each heater 11c is moved upward along the outer peripheral surface of each heater 11c. And the heat of the heating cylinder body 10 of the third heating unit 14 is absorbed. Then, the cooling air R whose temperature has risen is discharged to the outside from an exhaust port (not shown) formed so as to penetrate through positions corresponding to the heaters 11 c of the upper cover 43 covering the third heating unit 14. .

  In the third air cooling mechanism E3, the blower 50 is attached to the tip of the third protrusion 44c formed on the lower cover 44, and the third protrusion 44c covers the fourth heating part 15 of the lower cover 44. Of the portion, a portion excluding a part on the front end 10a side and the rear end 10b side in the axis O1 direction is formed to protrude outward in the direction orthogonal to the axis O1. In addition, a plurality of rectifying plates 50 (four in this embodiment) are provided so as to divide the space M3 formed by the third projecting portion 44c into the heater 11d side and the blower 50 side. The plurality of rectifying plates 50 are arranged so as to face the four heaters 11d of the fourth heating unit 15 one by one, as in the second air cooling mechanism E2, and the third projecting portion via the connecting member 52. 44c. Also in the third air cooling mechanism E3, the cooling air R sent from the blower 50 into the space M3 of the third projecting portion 44c is rectified by each rectifying plate 50, and each heater 11d of the fourth heating unit 15 is rectified. Is blown from the lower side of the heater 11 and flows upward along the outer peripheral surface of each heater 11 d to absorb the heat of the fourth heating unit 15. The cooling air R circulated upward is discharged to the outside from an exhaust port (not shown) formed so as to penetrate the upper cover 43 covering the fourth heating unit 15 at a position corresponding to each heater 11d. .

  The control device of the first embodiment and the blowers 50 of the first to third air cooling mechanisms E1, E2, and E3 are connected, and the drive of each blower 50 is controlled by the control device.

  Next, a method for cooling the high-temperature heating cylinder 7 by the heating cylinder cooling mechanism C of the injection molding machine A having the above configuration will be described, and the operation and effect of the heating cylinder cooling mechanism C of the injection molding machine A of the present embodiment will be described. explain.

  At the time of switching the molding material or during maintenance, for example, an operator performs a switch operation of the control device, and similarly to the first embodiment, the cooling water W is supplied to the cooling water jacket 21 and the first to third communication pipes 24, 25, and 26. Circulates and the heat of the high-temperature heating cylinder body 10 is absorbed.

  In the present embodiment, when the switch operation of the control device is performed as described above, the blowers 50 of the first to third air cooling mechanisms E1, E2, and E3 start driving. As a result, the cooling air R is blown to the heaters 11b, 11c, and 11d of the second to fourth heating units 13, 14, and 15, and the cooling air R moves upward along the outer peripheral surfaces of the heaters 11b, 11c, and 11d. The heat of each heating part 13,14,15 is absorbed by circulating through. Furthermore, the cooling air R supplied in this way also contacts the cooling water jacket 21 and the first to third communication pipes 24, 25, and 26 of the first water cooling mechanism B1 and the second water cooling mechanism B2. For this reason, the effect which cools 1st water cooling mechanism B1 and 2nd water cooling mechanism B2 is also acquired, and the cooling water W which distribute | circulates these is made low temperature.

  And based on the detection result of each temperature sensor 20 sent to the control device, the cooling air R is sent from the heating parts 13, 14, 15 reduced to a desired temperature to the heating parts 13, 14, 15 reduced in temperature. The controller sequentially stops driving the blowers 50 of the first to third air cooling mechanisms E1, E2, and E3 that are supplying air. At this time, the control device lowers the temperature to a desired temperature based on the detection result of each temperature sensor 20 or based on the driving state of each blower 50 of the first to third air cooling mechanisms E1, E2, and E3. The circulation of the cooling water W of the first water cooling mechanism B1 or the second water cooling mechanism B2 that cools the heating units 12, 13, 14, and 15 is stopped. Specifically, for example, the driving of the blower 50 of the third air cooling mechanism E3 that cools the fourth heating unit 15 is stopped, and the control device that detects this stops the fourth heating unit 15 as well. The driving of the water supply means 34 of the cooling water supply mechanism 30 is stopped so that the supply of the cooling water W of the two-water cooling mechanism B2 is stopped, and an operation command is issued to the first switching valve 35 and the second switching valve 37 to give the first The pipe 33 and the second pipe 36 are closed. At the same time, an operation command is issued from the control device to the air supply means 38, the third switching valve 40, and the fourth switching valve 42 of the cooling water removal mechanism 31, and the air supply means 38 starts driving, and the third The switching valve 40 and the fourth switching valve 42 open the third pipe 39 and the fourth pipe 41. Thereby, the cooling water W in the cooling water jacket 21 and the first to third communication pipes 24, 25, and 26 is discharged by the air S sent from the air supply means 38, and all the cooling water W is discharged. When the predetermined time has elapsed, the control device stops driving the air supply means 38 and issues an operation command to the third switching valve 40 to close the third pipe 39.

  The first water cooling mechanism B1, the second water cooling mechanism B2, and the first to third air cooling mechanisms that cool the heating parts 13, 14, and 15 from the heating parts 13, 14, and 15 that have been sequentially lowered to a desired temperature as described above. By ending the cooling work by E1, E2, and E3, the entire heating cylinder 7 is finally lowered to a desired temperature.

  For example, when the large heating cylinder 7 mounted on the injection molding machine A having a mold clamping force of 850 ton class is cooled from 300 ° C. to 250 ° C., it takes 80 minutes by natural heat dissipation. Moreover, when the heating cylinder cooling mechanism B of 1st Embodiment is applied, it is shortened to 23 minutes. On the other hand, when the heating cylinder cooling mechanism C of this embodiment is applied and it cools by said operation, it has been proven that it can shorten to 18 minutes.

  Therefore, in the heating cylinder cooling mechanism C of the injection molding machine A of the present embodiment, the heating cylinder 7 is cooled to a desired temperature more efficiently and earlier than the heating cylinder cooling mechanism B shown in the first embodiment. be able to. Therefore, switching and maintenance of the molding material can be performed at an early stage, and the time for stopping the operation of the injection molding machine A can be greatly shortened, so that further improvement in productivity can be achieved.

  In addition, although 2nd Embodiment of the heating cylinder cooling mechanism of the injection molding machine which concerns on this invention was described, this invention is not limited to said embodiment, The modification shown in 1st Embodiment is included. It can be changed as appropriate without departing from the spirit of the invention. For example, in the present embodiment, the air blowing mechanism E is configured by three air cooling mechanisms E1, E2, and E3 of the first air cooling mechanism E1, the second air cooling mechanism E2, and the third air cooling mechanism E3. There is no need to limit the number of air cooling mechanisms of E.

  In this connection, it is assumed that one air blower (blower) 50 is provided for each air cooling mechanism E1, E2, E3 of the air blow mechanism E. The cooling air R may be supplied to the heating unit. Conversely, the first projecting portion 44a, the second projecting portion 44b, and the third projecting portion 44c are formed as one projecting portion, that is, the spaces M1, M2, and M3 of the projecting portions 44a, 44b, and 44c are formed in the direction of the axis O1. One protrusion may be formed so as to be continuous as one space, and one or a plurality of blowers 50 may be provided at the tip of the protrusion.

  Furthermore, in this embodiment, although the ventilation mechanism E shall be comprised including the air blower 50, the baffle plate 51, and the connection member 52, it equipped with the air blower 50 at least and the heater 11 and the heating cylinder main body 10 were comprised. It is only necessary that the cooling air R can be used for cooling, and the configuration of the blower mechanism E is not particularly limited. Further, the cooling air R may be blown directly from the blower 50 to the heater 11 or the heating cylinder body 10 without providing the upper cover 43 and the lower cover 44.

  In the present embodiment, the air blowing mechanism E is provided in the lower cover 44 and the cooling air R is circulated from below to above. However, the cooling air R is provided in the upper cover 43 from below to below. R may be distributed.

  Further, the exhaust air outlet is formed in the upper cover 43 to discharge the cooling air R to the outside. For example, the cooling air R can be discharged from other gaps communicating with the outside of the upper cover 43 and the lower cover 44. In particular, it is not necessary to provide an exhaust port, and even when an exhaust port is provided, it is not necessary to limit the position and shape.

It is the figure which showed the injection molding machine which concerns on 1st Embodiment of this invention. It is the figure which showed the heating cylinder which attaches the heating cylinder cooling mechanism of the injection molding machine which concerns on 1st Embodiment of this invention. It is a figure which shows the heating cylinder cooling mechanism of the injection molding machine which concerns on 1st Embodiment of this invention. It is a perspective view which shows the heating cylinder cooling mechanism of the injection molding machine which concerns on 1st Embodiment of this invention. It is a figure which shows the cooling water supply / discharge mechanism of the heating cylinder cooling mechanism of the injection molding machine which concerns on 1st Embodiment of this invention. It is a figure which shows the modification of the heating cylinder cooling mechanism of the injection molding machine which concerns on 1st Embodiment of this invention. It is a figure which shows the heating cylinder cooling mechanism of the injection molding machine which concerns on 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 5 Injection unit 6 Injection nozzle 7 Heating cylinder 10 Heating cylinder main body 10a Front end 10b Rear end 11 Heater 12 1st heating part 13 2nd heating part 14 3rd heating part 15 4th heating part 16 5th heating part 20 Temperature sensor 21 Cooling Water jacket 22 Upper cooling water jacket 23 Lower cooling water jacket 24 First communication pipe (communication pipe)
25 Second communication pipe (communication pipe)
26 Third communication pipe 27 Drain pipe 28 Water supply pipe 30 Cooling water supply mechanism (cooling water supply / discharge mechanism)
31 Cooling water removal mechanism (cooling water supply / discharge mechanism)
43 Upper cover 44 Lower cover 45 Screw 50 Blower 51 Baffle plate 52 Connecting member A Injection molding machine B Heating cylinder cooling mechanism B1 First water cooling mechanism B2 Second water cooling mechanism C Heating cylinder cooling mechanism E Blower mechanism E1 First air cooling mechanism E2 2nd air cooling mechanism E3 3rd air cooling mechanism H Crevice O1 Axis line R of heating cylinder Cooling air S Air W Cooling water

Claims (5)

Cooling a heating cylinder provided with a heating cylinder body provided with an injection nozzle at the front end and supported by connecting an injection unit capable of moving back and forth back and forth, and a heater provided on the outer periphery of the heating cylinder body A heating cylinder cooling mechanism of an injection molding machine for
A heating cylinder cooling mechanism for an injection molding machine, comprising a cooling water jacket that is provided on an outer peripheral side of the heating cylinder and cools the heating cylinder with cooling water that circulates in a hollow portion. In the heating cylinder cooling mechanism of the injection molding machine according to claim 1,
A heating cylinder cooling mechanism comprising a blower mechanism for blowing cooling air to the outer peripheral side of the heating cylinder. In the heating cylinder cooling mechanism of the injection molding machine according to claim 1 or 2,
The cooling water is supplied to the cooling water jacket, and after the heating cylinder is cooled to a desired temperature, air is supplied to the hollow portion of the cooling water jacket to discharge the cooling water in the hollow portion to the outside. A heating cylinder cooling mechanism for an injection molding machine, comprising a cooling water supply / discharge mechanism. In the heating cylinder cooling mechanism of the injection molding machine according to any one of claims 1 to 3,
A heating cylinder cooling mechanism of an injection molding machine, wherein a plurality of the heaters are arranged side by side with a gap in the axial direction of the heating cylinder, and the cooling water jacket is disposed at least in the gap. In the heating cylinder cooling mechanism of the injection molding machine according to any one of claims 1 to 4,
A plurality of the cooling water jackets are arranged side by side in the axial direction, and the cooling water jackets adjacent in the axial direction are connected to each other via a communication pipe that connects the hollow portions to each other. Heating cylinder cooling mechanism for injection molding machines.

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