JP4402003B2 - Injection device and injection method - Google Patents

Description

  The present invention relates to a pre-plastic injection device and an injection method in which a plasticizing part that melts a resin to produce a molten resin and an injection part that injects the molten resin are independent of each other.

  The injection device of the injection molding machine is roughly classified into an in-line type injection device and a pre-plastic type injection device. The in-line injection apparatus performs melting of the resin with a screw and injects the molten resin as the screw moves forward.

  On the other hand, as disclosed in, for example, Patent Document 1, a pre-plastic injection device has a plasticizing part that melts a resin to generate a molten resin and an injection part that injects the molten resin independently. The resin melted in the plasticizing part is sent to the storage chamber of the injection part and injected by the injection plunger. This pre-plastic injection device has advantages such as stable metering and high-pressure injection compared to an in-line injection device, so it is often selected when molding molded parts that require high precision. .

By the way, since the plasticizing part and the injection part are separate, a check valve for preventing a backflow from the injection part to the plasticizing part is provided in the middle of the communication path connecting the plasticizing part and the injection part. Yes. The check valve of Patent Document 1 is configured to open and close the communication passage by rotating the valve body with a rotation shaft orthogonal to the passage direction.
JP-A-9-136334

However, the pre-plastic injection device as in Patent Document 1 includes the following (Problem 1) to (Problem 3).
(Problem 1) Since the check passage is required to be provided in the middle of the communication passage, the communication passage becomes longer, so that the resin tends to stay in the middle of the communication passage. Such a staying resin may adversely affect the molded product due to thermal decomposition (burning or the like), or may be troublesome in changing the resin and reduce productivity.

  (Problem 2) Once the thermosetting resin is cured, it will not be plasticized again even if it is heated again. Therefore, when such a thermosetting resin is used as the material of a molded product, the problem 1 causes stagnation and curing. If it does, the passage will be blocked and the injection device will not be usable. Therefore, a thermosetting resin cannot be used in the pre-plastic injection device as in Patent Document 1.

  (Problem 3) Since the plasticizing part and the injection part are independent, the structure is complicated as compared with the in-line type, so that there is a problem that the equipment cost increases particularly in the process of using a plurality of units.

  The present invention has been made to solve the above problems, and a first object thereof is to provide a plasticizer part in a pre-plastic injection device and injection method in which a plasticizer part and an injection part are independent. The purpose is to suppress the generation of staying resin in the communication path between the injection part and the injection part.

  A second object is to realize a reduction in equipment cost when a plurality of units are used.

The invention described in claim 1 includes a plasticizing portion that plasticizes to generate a molten resin, and a storage chamber that stores the molten resin, and the volume of the storage chamber is reduced by an injection operation in the axial direction of the plunger. A pre-plastic injection device in which an injection portion for injecting molten resin in a storage chamber is independent, and the injection portion is coaxial with the plunger between a main body portion of the injection portion and the plunger. And a sleeve member that is operated along the axial direction. The sleeve member includes the storage chamber inside and penetrates from the storage chamber to the outer surface of the sleeve member in a direction intersecting the axial direction. A communication passage between the storage chamber and the plasticizing portion is configured to include the connection passage, and the sleeve member is provided with a front passage when the molten resin is supplied to the storage chamber. communicating the Killen communication passage It is actuated to a first position for, at the time of the injection operation of the plunger, and its gist that the communication passage is actuated to a second position to occlude between the plasticizing unit and the storage chamber.

The invention according to claim 2 is the injection apparatus according to claim 1, wherein the sleeve member constitutes the communication passage extending from the storage chamber in a direction intersecting the axial direction by the connection passage , When the molten resin is supplied to the storage chamber when operated to the first position, the communication passage communicates with the plasticizing portion, and when the plunger is injected to the second position, The gist is that the communication passage is displaced from the communication position with the plasticizing portion and is closed by the main body of the injection portion.

  According to a third aspect of the present invention, in the injection device according to the second aspect, the sleeve member includes an injection nozzle that communicates with the storage chamber and injects the molten resin into a mold. When the nozzle is operated to a position where it abuts on the mold, the gist is that the nozzle is disposed at the second position that closes the communication passage.

  According to a fourth aspect of the present invention, in the injection device according to any one of the first to third aspects, the sleeve member is operated between two positions, the first position and the second position. This is the gist.

  According to a fifth aspect of the present invention, in the injection apparatus according to any one of the first to fourth aspects, the communication passage is configured to extend linearly in a direction orthogonal to the axial direction. The gist.

The invention according to claim 6 is the gist of the injection device according to any one of claims 1 to 5, wherein the plasticizing portion is configured to be able to contact and separate from the injection portion. To do.
A seventh aspect of the present invention is the injection apparatus according to the sixth aspect, wherein a plurality of the injection sections are provided for one plasticization section, and each injection operation is sequentially performed, and the plasticization section Is disconnected from the injection unit at the timing when the communication passage is closed by the operation of the sleeve member, and is connected to the injection unit at the next timing to supply the molten resin. The gist is that the state of connection with the injection portion is switched.

According to an eighth aspect of the present invention, there is provided a plasticizing portion that plasticizes to generate a molten resin, and a storage chamber that stores the molten resin, and the volume of the storage chamber is reduced by an injection operation in the axial direction of a plunger. A pre-plastic injection device in which an injection portion for injecting molten resin in a storage chamber is independent, and is inserted between a main body portion of the injection portion and the plunger so as to be coaxial with the plunger. An injection method of an injection apparatus including a sleeve member operated along a direction, wherein the sleeve member includes the storage chamber inside and intersects the axial direction from the storage chamber to an outer surface of the sleeve member. A connecting passage that penetrates in the direction, and the communication passage between the storage chamber and the plasticizing portion is configured to include the connection passage, and when the molten resin is supplied to the storage chamber, the Killen communication passage The sleeve member is actuated at a first position to allow passage, and the sleeve member is actuated to a second position for closing the communication passage between the storage chamber and the plasticizing portion during the injection operation of the plunger. The gist of this is to do so.

(Function)
According to the first and eighth aspects of the invention, the injection member includes the sleeve member that is inserted between the main body portion and the plunger so as to be coaxial with the plunger and is operated along the axial direction. Provided. The sleeve member is actuated to a first position for communicating the communication passage between the storage chamber and the plasticizing portion when the molten resin is supplied to the storage chamber. That is, when the communication path is in the communication state, the molten resin is supplied from the plasticizing portion into the storage chamber via the communication path. Further, at the time of the injection operation of the plunger, the sleeve member is operated to the second position that closes the communication passage between the storage chamber and the plasticizing portion. That is, when the communication passage is closed, the backflow of the molten resin from the storage chamber to the plasticizing portion side is prevented during the injection operation of the plunger. By using such a sleeve member, the communication passage can be connected and closed at a position close to the storage chamber. Therefore, since the communication path between the storage chamber and the plasticizing part can be shortened as much as possible, generation of staying resin in the middle of the path can be suppressed. Thereby, the bad influence given to a molded article by thermal decomposition (burning etc.) can be reduced, and the effect of reducing the effort concerning resin replacement etc. and leading to productivity improvement can be expected. And since generation | occurrence | production of a residence resin is suppressed, even if it uses not only a thermoplastic resin but thermosetting resin, shaping | molding by this pre-plastic injection apparatus is attained. Further, since the sleeve member is arranged coaxially with the plunger and operates in the axial direction similarly to the plunger, it is possible to share a mechanism that supports the plunger and the sleeve member so as to be movable in the axial direction. . Furthermore, since the sleeve member is a simple linear operation along the axial direction thereof, it is possible to prevent the communication passage from being enlarged and complicated at the portion where the communication passage is connected and closed, which also contributes to shortening of the communication passage. be able to.

The sleeve member includes a storage chamber and a connection passage that penetrates from the storage chamber to the outer surface of the sleeve member in a direction intersecting the axial direction, and the communication path between the storage chamber and the plasticizing portion is , Including the connection passage.
According to the invention described in claim 2, sleeves member, when actuated in a first position when the supply of the molten resin into the storage chamber, communication passage communicates with the plasticizing unit, at the time of injection operation of the plunger When actuated to the second position, the communication passage is displaced from the communication position with the plasticizing part and is closed by the main body part of the injection part. That is, since the storage chamber and the communication passage can be configured in the sleeve member from the mounting state and operation mode of the sleeve member, and the communication and blocking of the passage can be performed, it contributes to the simplification of the configuration of the injection unit. Can do.

  According to the third aspect of the present invention, the sleeve member has an injection nozzle that communicates with the storage chamber and injects the molten resin into the molding die, and the sleeve member operates to a position where the injection nozzle contacts the molding die. The communication passage is disposed at the second position where the communication passage is closed. That is, since the injection nozzle is configured in the sleeve member, it is possible to contribute to further simplification of the configuration of the injection unit. Further, since the sleeve member is disposed at the second position where the communication passage is closed at the same time when the injection nozzle is operated to a position where it comes into contact with the mold, the injection operation can be performed as it is. Thereby, operation | movement of an injection | emission part can be simplified.

According to the fourth aspect of the present invention, since the sleeve member is operated between the first position and the second position, the operation of the injection unit can be simplified.
According to the fifth aspect of the present invention, since the communication passage is configured to extend linearly in a direction orthogonal to the axial direction, the communication passage can be shortened. Further, since the communication passage has a simple shape, it is easy to form the passage.

According to the invention described in claim 6, since the plasticizing part is configured to be able to come into contact with and separate from the injection part, it is possible to easily replace or maintain each device.
According to the invention described in claim 7, a plurality of injection parts are provided for one plasticizing part, and each injection operation is sequentially performed. The plasticizing part is configured to be able to come into contact with and separate from the injection part, and the connection with the injection part is released at the timing when the communication passage is closed by the operation of the sleeve member of the injection part, and then the molten resin is supplied. The connection state with the injection unit is switched so as to be connected to the injection unit at the timing to be performed. As a result, an injection apparatus having a plurality of injection parts and one plasticizing part can be configured, and the number of plasticizing parts can be reduced. Therefore, it is possible to realize a reduction in equipment cost.

As described above, according to the first to sixth aspects of the present invention, it is possible to provide an injection device that can suppress the generation of staying resin in the communication passage between the plasticizing portion and the injection portion.
According to the invention of claim 7, it is possible to provide an injection apparatus capable of realizing a reduction in equipment cost when using a plurality of units.

  According to the invention of claim 8, it is possible to provide an injection method capable of suppressing the generation of staying resin in the communication passage between the plasticizing part and the injection part.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a pre-plastic injection device 1 of the present embodiment. In the pre-plastic injection device 1, the injection part 2 and the plasticizing part 3 are configured independently, the resin R melted in the plasticizing part 3 is sent to the injection part 2, and the injection part 2 is the molten resin R. Is injected into a mold 6 placed on the lower base 5.

  Specifically, the upper base 10 of the injection part 2 is supported on the upper part of the lower base 5 on which the molding die 6 is disposed by a support member (not shown). The upper base 10 is provided with a housing recess 10a at a portion facing the mold 6 and a fixed block 11 is fixed in the housing recess 10a. The fixed block 11 includes a temperature adjusting device 12 such as a heater, and the temperature adjusting device 12 sets the temperature of the fixed block 11, that is, the temperature of the resin R stored in a storage chamber 17 in a plunger cylinder sleeve 14 to be described later. Operates to keep on.

  A fixed hole 11 a having a circular cross section is formed in the fixed block 11 so as to penetrate in the vertical direction (vertical direction of the lower base 5) so as to face the molding die 6. A cylindrical fixing sleeve 13 is fitted and fixed to the inner peripheral surface of the fixing hole 11a. The fixing block 11 and the fixing sleeve 13 are respectively formed with insertion holes 11b and 13a penetrating in the radial direction (horizontal direction) of the fixing sleeve 13 at the center in the vertical direction. Each insertion hole 11b, 13a has a mutually continuous shape, and has a taper shape in which the diameter increases from the inner peripheral surface of the fixing sleeve 13 toward the radially outer side. A screw cylinder sleeve 21 (to be described later) of the plasticizing portion 3 is inserted into each insertion hole 11b, 13a along the horizontal direction.

  A substantially bottomed cylindrical plunger cylinder sleeve 14 serving as a sleeve member is fitted into the fitting insertion hole 13b on the inner side of the fixed sleeve 13 so as to be movable. The plunger cylinder sleeve 14 is slid in the vertical direction (axial direction) in the fixed sleeve 13 by a plunger and a sleeve drive mechanism (not shown), and operates so as to contact and separate from the mold 6. Incidentally, the upper part of the plunger cylinder sleeve 14 protrudes from the upper part of the upper base 10 through an insertion hole 10 b provided in the upper part of the upper base 10. The lower end portion of the plunger cylinder sleeve 14 is a closed portion 14a, and a cylindrical injection nozzle 15 extending further downward is provided at the central portion of the closed portion 14a. The outer peripheral portion of the tip of the injection nozzle 15 is a contact portion 15a having a tapered shape (tapered shape). Incidentally, the mold 6 is vertically divided into two, and an injection hole 6 a for injecting the molten resin R into the cavity 7 is provided at the center of the upper surface of the upper mold. The injection hole 6 a is formed in a taper shape following the contact portion 15 a at the outer peripheral portion of the tip of the injection nozzle 15. In addition, although the contact part 15a and the injection hole 6a are made into the taper shape, it is good also as a curved surface shape (R shape).

  On the inner side of the plunger cylinder sleeve 14, an insertion hole 14b for inserting the plunger 16 is provided. The insertion hole 14b communicates with the injection passage 15b inside the injection nozzle 15, and has a tapered surface 14c that decreases in diameter toward the injection passage 15b. A connecting passage 14d that penetrates in the direction (horizontal direction) perpendicular to the axial direction of the sleeve 14 is formed on the tapered surface 14c, which is in the vicinity of the injection passage 15b, up to the outer peripheral surface of the plunger cylinder sleeve. The connection passage 14d is a communication passage for communicating the storage chamber 17 and the plasticizing portion 3 (screw cylinder sleeve 21). The passage length of the connection passage 14 d is a short passage length corresponding to the radial thickness of the plunger cylinder sleeve 14.

  A substantially columnar plunger 16 is movably inserted into the insertion hole 14b provided inside the plunger cylinder sleeve 14 so as to be coaxial. The plunger 16 slides in the plunger cylinder sleeve 14 in the vertical direction (axial direction) by the plunger and the sleeve drive mechanism, and operates so as to contact and separate from the closed portion 14a (taper surface 14c) at the lower end of the sleeve 14. The lower end portion 16 a of the plunger 16 is formed in a tapered shape, and is formed in a tapered shape following the tapered surface 14 c in the plunger cylinder sleeve 14. A space surrounded by the inner peripheral surface of the fitting insertion hole 14b of the plunger cylinder sleeve 14 and the lower end portion 16a of the plunger 16 serves as a storage chamber 17 for temporarily storing the molten resin R.

  Here, the position of the plunger cylinder sleeve 14 shown in FIG. 1 is the upper end position. At this upper end position, a connection passage 14d provided in the plunger cylinder sleeve 14 and an insertion hole 13a provided in the fixed sleeve 13 (a supply nozzle to be described later) 23 and the supply passage 23b) in the communication line 23 are in communication with each other. The plunger 16 is also located at the upper end in the plunger cylinder sleeve 14, and the storage chamber 17 has a predetermined volume. Incidentally, the height position of the plunger 16 can be adjusted, whereby the volume of the storage chamber 17, that is, the injection amount can be adjusted.

  On the other hand, the position of the plunger cylinder sleeve 14 shown in FIG. 2 is the lower end position, and at this lower end position, the connection passage 14d provided in the plunger cylinder sleeve 14 is displaced from the insertion hole 13a of the fixed sleeve 13 to the lower end of the fixed sleeve 13. It is positioned and is closed by the inner peripheral surface of the fitting insertion hole 13b of the fixed sleeve 13. At the same time, the insertion hole 13 a provided in the fixed sleeve 13 is also displaced from the connection passage 14 d and is closed by the outer peripheral surface of the plunger cylinder sleeve 14. Further, at the lower end position, the injection nozzle 15 of the plunger cylinder sleeve 14 abuts on the inner peripheral surface of the injection hole 6 a in the upper part of the mold 6. The plunger 16 is also located at the lower end in the plunger cylinder sleeve 14 and minimizes the volume in the storage chamber 17. That is, when the plunger 16 operates to the lower end position of the plunger cylinder sleeve 14, a predetermined amount of the molten resin R stored in the storage chamber 17 is injected into the cavity 7 in the mold 6.

  A shutter device 18 is attached to the lower surface of the upper base 10. The shutter device 18 includes a drive unit 19 and a shutter plate 20, the drive unit 19 is fixed to the lower surface of the upper base 10, and the shutter plate 20 penetrates in the radial direction of the fixed block 11 and the fixed sleeve 13. , 13c. The shutter plate 20 operates so as to be able to advance and retract in the horizontal direction from the through hole 13 c of the fixed sleeve 13 by driving of the driving unit 19.

  When the plunger cylinder sleeve 14 is disposed at the upper end position shown in FIG. 1, the shutter plate 20 is advanced, and the shutter plate 20 comes into contact with the tip of the injection nozzle 15. That is, the shutter plate 20 closes the injection passage 15 b of the injection nozzle 15 so that the molten resin R can be stored in the storage chamber 17. On the other hand, when the plunger cylinder sleeve 14 is disposed at the lower end position shown in FIG. 2, the shutter plate 20 is retracted into the through hole 13 c of the fixed sleeve 13. In other words, the shutter plate 20 is retracted into the through hole 13c of the fixed sleeve 13, so that the plunger cylinder sleeve 14 is prevented from interfering with the sleeve 14 when the plunger cylinder sleeve 14 is lowered, and the lowering operation of the sleeve 14 is not hindered. Yes.

  In contrast to the injection unit 2 having such a configuration, the plasticizing unit 3 includes a screw cylinder sleeve 21 and a screw 22. A screw 22 is rotatably mounted in the screw cylinder sleeve 21, and the sleeve 21 is filled with a molten resin R. The screw 22 is rotated in the screw cylinder sleeve 21 by a screw driving mechanism (not shown). The screw cylinder sleeve 21 is heated by a heater (not shown) so that the molten resin R in the sleeve 21 is maintained at a predetermined temperature.

  A cylindrical supply nozzle 23 is provided at the tip of the screw cylinder sleeve 21. The outer peripheral portion of the tip of the supply nozzle 23 is an abutting portion 23 a having a tapered shape (tapered shape) following the tapered shape of the insertion hole 13 a of the fixed sleeve 13. In addition, although this contact part 23a and the said insertion hole 13a are made into the taper shape, it is good also as a curved surface shape (R shape). A supply passage 23b is provided in the supply nozzle 23, and the length of the supply passage 23b is set to be extremely short. Then, the screw cylinder sleeve 21 has an abutting portion 23a at the tip of the supply nozzle 23 and an inner periphery of the insertion hole 13a of the fixed sleeve 13 so that the supply passage 23b and the connection passage 14d are linear along the horizontal direction. It is supported in the horizontal direction while being in contact with the surface. In this embodiment, the screw cylinder sleeve 21 (plasticizing part 3) can be brought into contact with and separated from the injection part 2.

  When the plunger cylinder sleeve 14 is disposed at the upper end position shown in FIG. 1, the supply passage 23 b inside the supply nozzle 23 communicates directly with the connection passage 14 d of the plunger cylinder sleeve 14, It communicates with the storage chamber 17. When the screw 22 rotates in this communication state, the molten resin R plasticized in the screw cylinder sleeve 21 is supplied into the storage chamber 17 through the supply passage 23b and the connection passage 14d.

Next, operation | movement of the injection device 1 of such a structure is demonstrated.
At the time of molding, the fixed block 11 and the screw cylinder sleeve 21 are heated, and the temperature is adjusted so that the molten resin R inside each has a suitable temperature.

  First, in the initial molding state, the plunger cylinder sleeve 14 is positioned at the upper end (see FIG. 1), and the shutter plate 20 closes the injection passage 15b of the injection nozzle 15. However, in this initial molding state, the plunger 16 is positioned at the lower end in the plunger cylinder sleeve 14 (not shown).

  From this state, the molten resin R is supplied from the supply passage 23 b of the supply nozzle 23 to the storage chamber 17 in the plunger cylinder sleeve 14 through the connection passage 14 d by the rotation of the screw 22. In this case, since the shutter plate 20 closes the injection passage 15b of the injection nozzle 15, the molten resin R is filled into the storage chamber 17 without leaking from the injection passage 15b.

  Thereby, the plunger 16 in the plunger cylinder sleeve 14 is raised by the supply pressure of the molten resin R. Incidentally, the molten resin R is measured at the height position of the plunger 16. When a predetermined amount of molten resin R is filled in the storage chamber 17 and the plunger 16 is raised to the upper end position (predetermined height position) shown in FIG. 1, the rotation of the screw 22 is reversed, and the internal pressure of the storage chamber 17 is lowered. (Suckback operation)

  Next, the shutter plate 20 is retracted into the through hole 13 c of the fixed sleeve 13 by driving of the driving unit 19. In this case, dripping of the molten resin R from the injection nozzle 15 is prevented by performing the above-described suck back operation.

  Next, until the contact portion 15a at the tip of the injection nozzle 15 contacts the inner peripheral surface of the injection hole 6a of the mold 6 (see FIG. 2), the plunger cylinder sleeve 14 is lowered by the drive of the plunger and the sleeve drive mechanism (nozzle). Touch action). At this time, the plunger 16 in the plunger cylinder sleeve 14 moves down integrally with the sleeve 14 without moving relative to the sleeve 14.

  Due to the lowering of the plunger cylinder sleeve 14, the connection passage 14 d is closed at the inner peripheral surface of the fitting insertion hole 13 b of the fixed sleeve 13, and the supply passage 23 b is closed at the outer peripheral surface of the plunger cylinder sleeve 14. That is, the connection passage 14d and the supply passage 23b are cut off, and the back flow of the molten resin R from the connection passage 14d to the supply passage 23b is prevented from occurring during the injection operation of the plunger 16.

  Next, the plunger 16 is lowered to the lower end position shown in FIG. As a result, a predetermined amount of the molten resin R stored in the storage chamber 17 is injected into the cavity 7 through the injection passage 15 b in the injection nozzle 15 and the injection hole 6 a of the mold 6. At the time of the injection operation by the lowering of the plunger 16, the connection passage 14d is blocked by the inner peripheral surface of the fixed sleeve 13, so that the leakage from the connection passage 14d does not occur.

  Next, when the plunger cylinder sleeve 14 rises to the upper end position and reaches the upper end position and stops, the shutter plate 20 advances to close the injection passage 15b of the injection nozzle 15 and return to the above-described initial molding state. Thereafter, the above operation by the injection device 1 is repeated, and the resin molded products molded in the cavity 7 of the mold 6 are sequentially molded.

Next, characteristic actions and effects of the present embodiment will be described.
(1) A plunger that is inserted into the injection portion 2 between the fixed sleeve 13 on the main body side (fixed portion side) and the plunger 16 so as to be coaxial with the plunger 16 and is operated along the axial direction. A cylinder sleeve 14 is provided. The plunger cylinder sleeve 14 is located at the upper end position (the position shown in FIG. 1) for communicating the connection passage 14d between the storage chamber 17 and the plasticizing portion 3 (screw cylinder sleeve 21) when the molten resin R is supplied to the storage chamber 17. ). That is, when the connection passage 14d is in the communication state, the molten resin R is supplied from the plasticizing portion 3 into the storage chamber 17 through the connection passage 14d. Further, during the injection operation of the plunger 16, the plunger cylinder sleeve 14 is operated to the lower end position (position in FIG. 2) that closes the connection passage 14 d between the storage chamber 17 and the plasticizing portion 3. That is, when the connection passage 14d is closed, the backflow of the molten resin R from the storage chamber 17 to the plasticizing portion 3 side is prevented during the injection operation of the plunger 16.

  By using such a plunger cylinder sleeve 14, the connection passage 14 d can be communicated and closed at a position close to the storage chamber 17. For this reason, the connection passage 14d between the storage chamber 17 and the plasticizing section 3 can be shortened as much as possible, so that the generation of staying resin in the middle of the passage can be suppressed. Thereby, the bad influence given to a molded article by thermal decomposition (burning etc.) can be reduced, and the effect of reducing the effort concerning resin replacement etc. and leading to productivity improvement can be expected. And since generation | occurrence | production of a residence resin is suppressed, even if it uses not only a thermoplastic resin but a thermosetting resin, shaping | molding by this pre-plastic injection apparatus 1 is attained.

  Further, since the plunger cylinder sleeve 14 is arranged coaxially with the plunger 16 and operates in the axial direction similarly to the plunger 16, a mechanism for supporting the plunger 16 and the plunger cylinder sleeve 14 so as to be movable in the vertical direction is provided. Can be shared. A drive source for moving the plunger 16 relative to the plunger cylinder sleeve 14 is attached to a mechanism for moving the sleeve 14 up and down and moved together with the sleeve 14, thereby shifting the relative position between the plunger 16 and the plunger cylinder sleeve 14. Can be prevented.

  Furthermore, since the plunger cylinder sleeve 14 is a simple linear operation along the axial direction thereof, it is possible to prevent the connection passage 14d from communicating with and closing the large and complicated portion of the connection passage 14d. It can contribute to the conversion.

  (2) The plunger cylinder sleeve 14 is provided with a connection passage 14d that is provided with a storage chamber 17 and extends from the storage chamber 17 in a direction orthogonal to the axial direction. When the plunger cylinder sleeve 14 is operated to the upper end position when the molten resin R is supplied to the storage chamber 17, the connection passage 14 d communicates with the plasticizing portion 3, and when the plunger cylinder sleeve 14 is operated to the lower end position during the injection operation of the plunger 16. The connecting passage 14d is displaced from the communication position with the plasticizing section 3 (position facing the insertion hole 13a) and is blocked by the inner peripheral surface of the fixing sleeve 13 on the main body side of the injection section 2. That is, the plunger cylinder sleeve 14 can be configured with the storage chamber 17 and the connection passage 14d from the mounting state and operation mode of the plunger cylinder sleeve 14, and the passage 14d can be communicated and closed. This can contribute to simplification of the configuration.

  (3) The plunger cylinder sleeve 14 has an injection nozzle 15 that communicates with the storage chamber 17 and injects the molten resin R into the mold 6, and operates to a lower end position where the injection nozzle 15 contacts the mold 6. When the (nozzle touch operation) is performed, the connection passage 14d is simultaneously closed. That is, since the injection nozzle 15 is configured in the plunger cylinder sleeve 14, it is possible to contribute to further simplification of the configuration of the injection unit 2. Further, since the connection passage 14d is simultaneously closed by the nozzle touch operation of the plunger cylinder sleeve 14, the injection operation can be performed as it is. Thereby, operation | movement of the injection | emission part 2 can be simplified.

(4) Since the plunger cylinder sleeve 14 is actuated between the two positions of the upper end position and the lower end position, the operation of the injection unit 2 can be simplified.
(5) Since the connection passage 14d is configured to extend linearly in a direction orthogonal to the axial direction, it can contribute to shortening the connection passage 14d. Further, since the connection passage 14d has a simple shape, the passage 14d can be easily formed.

(6) Since the plasticizing unit 3 is configured to be able to contact and separate from the injection unit 2, it is possible to easily replace or maintain each device.
(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

  The injection device 1 according to the first embodiment is a combination of one plasticizing part 3 and one injection part 2, but the plunger cylinder sleeve 14 is lowered, for example, in FIG. In the state shown, the connection passage 14 d is completely closed at the inner peripheral surface of the fixed sleeve 13. That is, in this state, the screw cylinder sleeve 21 (plasticizing part 3) can be separated from the injection part 2.

  Therefore, in the present embodiment, as shown in FIG. 3, the injection device 30 is configured by combining one injection unit 2 with a plurality of injection units 2 (four in this case). The injection device 30 is configured so that the entire plasticizing part 3 can move forward and backward with respect to the injection part 2 so that the screw cylinder sleeve 21 can be contacted and separated, and the plasticizing part 3 can be slid in the arrangement direction of the injection parts 2. The injection unit 2 is operated so that the injection operations of the injection units 2 are sequentially performed.

  Then, at the timing when the plunger cylinder sleeve 14 is lowered in the injection part 2 to which the screw cylinder sleeve 21 is connected (the connection passage 14d is closed), the plasticizing part 3 (screw cylinder sleeve 21) is the injection part. Evacuate from 2. Next, when the molten resin is slid and moved to a position facing the injection section 2 which is the timing for supplying the molten resin, and the movement to the position facing the target injection section 2 is completed, the plasticizing section 3 ( The screw cylinder sleeve 21) advances and is connected, and the molten resin is supplied to the injection part 2. And it can implement as the injection apparatus 30 which provided the injection | pouring part 2 with respect to one plasticization part 3 by repeating these operation | movement.

  Thereby, it is possible to configure an injection apparatus 30 having a plurality of injection units 2 and a single plasticizing unit 3, and the number of plasticizing units 3 can be reduced. Therefore, it is possible to realize a reduction in equipment cost.

The embodiment of the present invention may be modified as follows.
In the first embodiment, the storage chamber 17, the connection passage 14d, the injection nozzle 15 and the like are integrally formed in the plunger cylinder sleeve 14, but the configuration of the sleeve 14 is not limited to this. It is sufficient that at least the plunger cylinder sleeve 14 can communicate and close the communication passage between the storage chamber 17 and the plasticizing portion 3. That is, the storage chamber 17, the connection passage 14 d, the injection nozzle 15, etc. may be configured as a member other than the plunger cylinder sleeve 14.

In the first embodiment, the plunger cylinder sleeve 14 is operated between the upper end position and the lower end position. However, the plunger cylinder sleeve 14 may be operated in three or more stages.
In the first embodiment, the connection passage 14d is linearly formed in a direction orthogonal to the axial direction, but is not limited to the orthogonal direction, and any direction that intersects the axial direction is sufficient. Further, the connection passage 14d may be formed in a gentle curve shape, for example, other than a straight shape.

In the first embodiment, the plasticizing unit 3 is configured to be able to contact and separate from the injection unit 2. However, the plasticizing unit 3 may be fixed to the injection unit 2.
In the first embodiment, the plasticizing portion 3 that plasticizes the resin R by the rotation of the screw 22 is used. However, a plasticizing portion having another configuration that does not use a screw may be used.

  In the second embodiment, the entire plasticizing part 3 is moved forward and backward with respect to the injection part 2 so that the screw cylinder sleeve 21 can be contacted and separated. For example, the screw cylinder sleeve 21 is partially attached to the injection part 2. On the other hand, it may be possible to move back and forth with respect to the injection unit 2.

  In the second embodiment, the injection device 30 is formed by combining one plasticizing unit 3 with respect to the four injection units 2, but the number of combinations is not limited to this.

It is sectional drawing which shows the state at the time of molten resin supply of the injection device in 1st Embodiment. It is sectional drawing which shows the state at the time of the molten resin injection of an injection device. It is a perspective view which shows the injection apparatus in 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,30 ... Injection apparatus, 2 ... Injection part, 3 ... Plasticization part, 6 ... Mold, 14 ... Plunger cylinder sleeve as a sleeve member, 14d ... Connection path which comprises a communication path, 15 ... Injection nozzle, 16 ... Plunger, 17 ... reservoir, R ... resin.

Claims (8)

An injection that has a plasticizing section that plasticizes to generate a molten resin, and a storage chamber that stores the molten resin, and injects the molten resin in the storage chamber by reducing the volume of the storage chamber by an injection operation in the axial direction of the plunger A pre-plastic injection device whose parts are independent of each other,
The injection portion includes a sleeve member that is inserted between the main body portion of the injection portion and the plunger so as to be coaxial with the plunger and is operated along the axial direction.
The sleeve member includes the storage chamber and a connection passage that penetrates from the storage chamber to the outer surface of the sleeve member in a direction intersecting the axial direction, and is provided between the storage chamber and the plasticizing portion. The communication passage is configured including the connection passage,
The sleeve member, at the time of supply of the molten resin into the storage chamber, is actuated front Killen passageway in a first position for communicating, at the time of the injection operation of the plunger, the said reservoir chamber plasticizing unit The injection device is actuated to a second position that closes the communication passage between the first injection device and the second injection device. The injection device according to claim 1, wherein
The sleeve member constitutes the communication passage extending from the storage chamber in a direction intersecting the axial direction by the connection passage, and is operated to the first position when the molten resin is supplied to the storage chamber. Then, the communication passage communicates with the plasticizing portion, and when the plunger is operated to the second position during the injection operation, the communication passage is displaced from the communication position with the plasticizing portion, and the main body of the injection portion. An injection device characterized in that the injection device is closed at a portion. The injection device according to claim 2,
The sleeve member has an injection nozzle that communicates with the storage chamber and injects the molten resin into a mold, and when the injection nozzle operates to a position where it contacts the mold, the communication passage is closed. The injection device is arranged at the second position. In the injection device according to any one of claims 1 to 3,
2. The injection apparatus according to claim 1, wherein the sleeve member is operated between two positions of the first position and the second position. In the injection device according to any one of claims 1 to 4,
The communication device is configured to extend linearly in a direction orthogonal to the axial direction. In the injection device according to any one of claims 1 to 5,
2. The injection apparatus according to claim 1, wherein the plasticizing part is configured to be able to contact and separate from the injection part. The injection device according to claim 6,
A plurality of the injection parts are provided for one plasticizing part, and each injection operation is sequentially performed.
The plasticizing portion is disconnected from the injection portion at the timing when the communication passage is closed by the operation of the sleeve member, and then connected to the injection portion that is the timing to supply the molten resin next. The injection device, wherein the connection state with the injection unit is switched as described above. An injection that has a plasticizing section that plasticizes to generate a molten resin, and a storage chamber that stores the molten resin, and injects the molten resin in the storage chamber by reducing the volume of the storage chamber by an injection operation in the axial direction of the plunger A sleeve member that is a pre-plastic injection device that is independent of the portion, and is fitted between the main body portion of the injection portion and the plunger so as to be coaxial with the plunger and is operated along the axial direction. An injection method for an injection device comprising:
The sleeve member includes the storage chamber and a connection passage that penetrates from the storage chamber to the outer surface of the sleeve member in a direction intersecting the axial direction, and is provided between the storage chamber and the plasticizing portion. The communication passage is configured including the connection passage,
During the supply of the molten resin into the storage chamber, it is said sleeve member actuating a pre Killen passageway in a first position for communicating, at the time of the injection operation of the plunger, the reservoir chamber and said plasticizing unit An injection method characterized in that the sleeve member is operated at a second position for closing the communication passage between the two.

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