Injection molding apparatus

Abstract

This invention provides a technology that allows for easy removal of the injection molding unit in an injection molding apparatus. [Solution] An injection molding apparatus is provided that performs injection molding of a molded product using a mold. This injection molding apparatus comprises an injection unit for injecting material into a mold, and a mold opening / closing unit to which the mold is attached and which opens and closes the mold. The injection unit comprises an injection section having an injection control unit for controlling the injection of material and a nozzle section for injecting material, a moving section for moving the injection unit relative to the mold opening / closing unit, and a holding plate connected to the injection section and holding the injection section. The moving section has a support section for supporting the holding plate, and the holding plate is slidably provided with respect to the support section.

Description

Technical Field

[0001] This disclosure relates to an injection molding apparatus.

Background Art

[0002] Patent Document 1 discloses a molding apparatus that fills a cavity with an uncured material made of rubber or a thermoplastic elastomer to form a molded product. Patent Document 2 discloses an injection apparatus for a resin that is injection-molded at a low viscosity and a low injection pressure, such as a liquid curable resin material typified by a liquid silicone resin.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In an injection molding apparatus, the injection part for injecting the material may be removed for cleaning or maintenance. Depending on the structure of the injection molding apparatus, the man-hours required for removing the injection part may increase. Particularly in a vertical injection molding apparatus, the increase in man-hours may become significant in order to prevent the injection part from falling.

Means for Solving the Problems

[0005] According to a first embodiment of the present disclosure, an injection molding apparatus is provided for performing injection molding of a molded product using a mold. The injection molding apparatus comprises an injection unit for injecting material into the mold, and a mold opening / closing unit to which the mold is attached and for opening and closing the mold, wherein the injection unit has an injection section having an injection control unit for controlling the injection of the material and a nozzle section for injecting the material, a moving section for moving the injection unit relative to the mold opening / closing unit, and a holding plate connected to the injection section and holding the injection section, wherein the moving section has a support section for supporting the holding plate, and the holding plate is slidably provided with respect to the support section. [Brief explanation of the drawing]

[0006] [Figure 1] This is a cross-sectional view showing the schematic configuration of an injection molding apparatus. [Figure 2] This is a cross-sectional view showing the schematic configuration of an injection molding apparatus. [Figure 3] This is a perspective view showing the connection between the moving part and the injection part. [Figure 4] This is a perspective view showing how the injection unit is connected to the moving unit. [Figure 5] This is a view from below showing the injection unit fixed to the moving unit. [Figure 6] This is a cross-sectional view showing how the injection unit is fixed to the moving unit. [Modes for carrying out the invention]

[0007] A. First Embodiment: Figure 1 is a cross-sectional view showing the schematic configuration of the injection molding apparatus 10. Figure 1 shows arrows representing the mutually orthogonal X, Y, and Z directions. The X and Y directions are parallel to the horizontal plane. The Z direction is parallel to the vertical direction. The X, Y, and Z directions in Figure 1 and the X, Y, and Z directions in other figures point to the same directions. When specifying the direction, the positive direction, which is the direction pointed to by the arrow, is denoted as "+", and the negative direction, which is the direction opposite to the direction pointed to by the arrow, is denoted as "-", and both positive and negative signs are used in the direction notation. The +Z direction is also called upward, and the -Z direction is also called downward.

[0008] The injection molding apparatus 10 forms a molded product by injecting material into a mold 900 mounted on the injection molding apparatus 10. In this embodiment, a liquid material with relatively low viscosity is used as the material for the molded product. In this embodiment, a two-component thermosetting material is used as the liquid material, which consists of a first liquid and a second liquid that are pre-mixed. The first liquid contains the main component of the thermosetting material. For example, a silicone polymer is used as the main component. The second liquid contains a polymerization initiator that starts the polymerization reaction of the two-component thermosetting material.

[0009] The injection molding apparatus 10 comprises a mold opening / closing unit 220, an injection unit 250, and a control unit 500. In this embodiment, the injection unit 250 and the mold opening / closing unit 220 are positioned side by side in the direction of gravity, i.e., in the -Z direction. In other words, the injection molding apparatus 10 in this embodiment is configured as a vertical injection molding apparatus 10.

[0010] The control unit 500 is comprised of a computer comprising one or more processors, memory, and an input / output interface for inputting and outputting signals to and from the outside. The control unit 500 performs various functions, such as executing the process of molding a molded product, by having the processor execute programs and instructions loaded into the main memory. Alternatively, instead of being comprised of a computer, the control unit 500 may be implemented by a configuration combining multiple circuits to realize at least some of each function.

[0011] The mold opening / closing unit 220 includes a fixed section 210. A molding die 900 is attached to the fixed section 210. The fixed section 210 includes a fixed platen 211 and a movable platen 212. The fixed platen 211 and the movable platen 212 are plate-shaped members. The fixed platen 211 is fixed to the upper end of a tie bar 213 that extends vertically, such that its plate surface is parallel to the horizontal direction. The movable platen 212 is positioned below the fixed platen 211 and opposite to the fixed platen 211, such that its plate surface is parallel to the horizontal direction. The fixed mold 901 of the molding die 900 is mounted on the fixed platen 211, and the movable mold 902 of the molding die 900 is mounted on the movable platen 212. The fixed mold 901 and the movable mold 902 are attached to the fixed platen 211 and the movable platen 212, respectively, by bolts or clamping mechanisms.

[0012] The mold opening / closing unit 220 opens and closes the mold 900 mounted on the fixed part 210. The mold opening / closing unit 220 rotates a ball screw 221 by driving a motor (not shown) under the control of the control unit 500, and moves a movable platen 212 coupled to the ball screw 221 along the tie bar 213. As the movable platen 212 moves along the tie bar 213, the mold 900 mounted on the fixed part 210 is opened and closed. When the movable platen 212 moves in the +Z direction, the mold 900 is clamped, and when the movable platen 212 moves in the -Z direction, the mold 900 is opened. When the mold 900 is clamped, the cavity Cv is partitioned by the fixed mold 901 and the movable mold 902. The cavity Cv is a space having a shape corresponding to the shape of the molded product.

[0013] In this embodiment, the mold 900 has a heater 903 for heating the mold 900 to cure the material filled in the cavity Cv. The temperature of the heater 903 is controlled by the control unit 500. The mold 900 may be made of metal, resin, or ceramic. A metal mold 900 is also called a mold.

[0014] The fixed mold 901 has a gate opening 904 which is a hole penetrating the fixed mold 901 in the vertical direction. The material is filled into the cavity Cv through the gate opening 904. The fixed mold 901 is mounted on the fixing part 210 such that the gate opening 904 faces the nozzle opening 321 of the nozzle part 320 in the vertical direction.

[0015] The injection unit 250 has an injection part 230 and a moving part 240.

[0016] The injection part 230 injects the material supplied from an external tank through a pump. The injection part 230 is provided above the fixing part 210 and the mold opening / closing unit 220. The injection part 230 is provided so as to be movable in the vertical direction along a guide member 242 described later. The injection part 230 includes a material supply port 319, a material flow path 310, a nozzle part 320, and an injection control part 330.

[0017] The material is supplied to the material supply port 319 from the outside.

[0018] The material flow path 310 communicates with the material supply port 319. The material flows inside the material flow path 310. A check valve 315 for preventing the backflow of the material is arranged in the material flow path 310.

[0019] The injection control part 330 controls the injection of the material under the control of the control part 500. The injection control part 330 has a cylinder 313, a plunger 332, and a plunger driving part 333 including a motor. The cylinder 313 communicates with the material flow path 310. The plunger 332 moves forward and backward along the X direction inside the cylinder 313 by the control part 500 controlling the driving of the plunger driving part 333. When the plunger 332 retreats in the direction away from the nozzle part 320 inside the injection cylinder 331, the material is sucked and measured into the injection cylinder 331. When the plunger 332 advances in the direction approaching the nozzle part 320 inside the injection cylinder 331, the sucked material is supplied to the nozzle part 320.

[0020] The nozzle part 320 injects the material supplied by the injection control part 330. The nozzle part 320 has a nozzle flow path 322 and a shut-off pin 334. The nozzle flow path 322 communicates with the cylinder 313. A nozzle opening 321 is formed at the tip of the nozzle part 320. The shut-off pin 334 controls the opening and closing of the nozzle opening 321 by moving forward and backward in the nozzle flow path 322 along the Z direction.

[0021] The shut-off pin 334 is inserted into the nozzle flow path 322 from the end of the nozzle flow path 322 on the side opposite to the nozzle opening 321. The shut-off pin 334 is a columnar member whose diameter is smaller than the diameter of the nozzle flow path 322, and is provided so as to be movable along the Z direction in the nozzle flow path 322. The shut-off pin 334 is driven by a shut-off pin drive part 338 under the control of the control part 500. In the present embodiment, the shut-off pin drive part 338 is connected to the nozzle part 320 in the X direction that intersects the Z direction, which is the direction in which the nozzle part 320 and a holding plate 260 to be described later are arranged. More specifically, the shut-off pin drive part 338 is connected to the nozzle part 320 on the side opposite to the injection control part 330.

[0022] The shut-off pin drive part 338 has, for example, an air cylinder, and moves the shut-off pin 334 in the nozzle flow path 322 using compressed air. When the shut-off pin 334 moves in the -Z direction inside the nozzle flow path 322, the nozzle opening 321 is blocked by the end of the shut-off pin 334 on the nozzle opening 321 side, and the injection of the material from the nozzle opening 321 stops. When the shut-off pin 334 moves in the +Z direction inside the nozzle flow path 322, the nozzle opening 321 opens, and the material can be injected from the nozzle opening 321. The shut-off pin drive part 338 is not limited to an air cylinder, and may drive the shut-off pin 334 using a motor or gears.

[0023] The movable part 240 is located above the injection unit 230. The movable part 240 moves the injection unit 250 relative to the mold opening / closing unit 220. The movable part 240 comprises a movable member 241, a guide member 242, a base 243, a screw shaft 244, a ball nut 245, and a movable motor 246. The screw shaft 244 and the ball nut 245 constitute a ball screw.

[0024] The injection unit 230 is fixed to the movable member 241. The movable member 241 is attached to the guide member 242, which is a columnar member extending vertically upward from the top of the fixed part 210, so that it can move along the guide member 242. The base 243 is fixed to the upper end of the guide member 242. The screw shaft 244 is fixed to the base 243 so that it protrudes downward from the base 243. The axis direction of the screw shaft 244 is along the vertical direction. The ball nut 245 is attached to the screw shaft 244 and is fixed to the connecting member 247 which is fixed to the movable member 241. The moving motor 246 is driven under the control of the control unit 500 and rotates the screw shaft 244 around its axis. As the screw shaft 244 rotates, the ball nut 245, the connecting member 247, and the movable member 241 move vertically, and the injection unit 230 moves vertically as a result. As the injection unit 230 moves in the -Z direction, the nozzle unit 320 comes into contact with the fixed mold 901 so that the nozzle opening 321 and the gate opening 904 are in communication. As the injection unit 230 moves in the +Z direction, the nozzle unit 320 moves away from the fixed mold 901. Figure 2 shows the state in which the injection unit 230 has been moved to a position where the nozzle unit 320 and the fixed mold 901 are in contact.

[0025] Figure 3 is a perspective view showing the connection between the movable part 240 and the injection part 230 of the injection unit 250. In Figure 3, the guide member 242 and other components are omitted from the illustration. In this embodiment, the injection unit 250 includes a holding plate 260. The holding plate 260 is connected to the injection part 230 of the injection unit 250 and holds the injection part 230. In this embodiment, the nozzle part 320 of the injection part 230 is connected to the holding plate 260. Specifically, the +Z end of the nozzle part 320 of the injection part 230 is connected to the holding plate 260 by a bolt. The injection control unit 330 of the injection part 230 is connected to the nozzle part 320. In other words, the injection control unit 330 is connected to the holding plate 260 via the nozzle part 320. The holding plate 260 has a substantially rectangular flat plate shape. The longitudinal direction of the holding plate 260 is along the X direction. The retaining plate 260 is positioned below the movable member 241 and parallel to the movable member 241.

[0026] The movable part 240 has a support part 270 that supports the holding plate 260. The support part 270 is fixed to the -Z direction side of the movable member 241 of the movable part 240. In this embodiment, the support part 270 is composed of a plurality of L-shaped fasteners. Specifically, the support part 270 includes a pair of first fasteners 271 and a pair of second fasteners 272. Each fastener of the pair of first fasteners 271 is arranged so that its L-shaped bent tip faces the other along the Y direction. Each fastener of the pair of second fasteners 272 is arranged so that its L-shaped bent tip faces the other along the Y direction. The spacing between each fastener in the pair of first fasteners 271 in the Y direction is equal to the spacing between each fastener in the pair of second fasteners 272 in the Y direction. The pair of first fasteners 271 and the pair of second fasteners 272 are arranged side by side in the X direction.

[0027] Figure 4 is a perspective view showing how the injection unit 230 is connected to the movable unit 240. As described above, the support unit 270 is composed of a pair of first fixing devices 271 and a pair of second fixing devices 272, so that an insertion space IS is formed below the movable member 241 for inserting the retaining plate 260 along the -X direction. When the operator fixes the injection unit 230 to the movable unit 240, the operator inserts the retaining plate 260 to which the injection unit 230 is connected into the insertion space IS from the +X direction to the -X direction. When the operator removes the injection unit 230 from the movable unit 240 for maintenance or cleaning, the operator moves the retaining plate 260 to which the injection unit 230 is connected from the -X direction to the +X direction. Thus, in this embodiment, the retaining plate 260 that holds the injection unit 230 is slidably provided with respect to the support unit 270 of the movable unit 240.

[0028] Figure 5 is a view from below of the injection unit 230 fixed to the movable unit 240. The retaining plate 260 has a first groove 261 and a second groove 262 of different shapes on its end face 269 in the direction of sliding relative to the support unit 270. In this embodiment, when the retaining plate 260 is viewed from below, the first groove 261 has a U-shape, and the second groove 262 has a V-shape.

[0029] The movable part 240 has a first restricting part 281 and a second restricting part 282. In this embodiment, the first restricting part 281 and the second restricting part 282 are provided on the lower surface of the movable member 241. The first restricting part 281 and the second restricting part 282 each have a cylindrical shape with the same diameter. The first restricting part 281 and the second restricting part 282 are spaced apart in the Y direction, but their positions are the same in the X direction.

[0030] The first restricting portion 281 contacts the first groove 261 formed in the retaining plate 260 when the retaining plate 260 is supported by the support portion 270. The second restricting portion 282 contacts the second groove 262 formed in the retaining plate 260 when the retaining plate 260 is supported by the support portion 270. The length of the first groove 261 in the direction along the end face 269 is greater than the diameter of the first restricting portion 281. When the second restricting portion 282 contacts the triangular second groove 262 at two points, the first restricting portion 281 contacts the rectangular first groove 261 at one point. The first restricting portion 281 and the second restricting portion 282 function as restricting the movement of the retaining plate 260 in the -X direction relative to the support portion 270. Furthermore, the first restricting section 281 and the second restricting section 282 function as positioning sections that position the holding plate 260 relative to the support section 270 in the X and Y directions.

[0031] Figure 6 is a cross-sectional view showing how the injection unit 230 is fixed to the movable unit 240. The injection unit 250 has a fixing mechanism 290 that fixes the holding plate 260 to the movable unit 240. In this embodiment, four fixing mechanisms 290 are arranged at positions corresponding to the four corners of the holding plate 260. Each fixing mechanism 290 has a screw 291 and a spring 292 provided around the threads of the screw 291. The spring 292 constantly biases the screw 291 in the opposite direction to the holding plate 260, i.e., in the +Z direction. After the holding plate 260 is supported by the support part 270, the screw 291 is screwed into the screw hole 264 of the holding plate 260 through a through hole 293 provided in the movable member 241, thereby fixing the injection unit 230 held by the holding plate 260 to the movable unit 240. In this embodiment, a retaining member 294 is placed at the opening of the through hole 293 to prevent the screw 291 from coming out of the through hole 293.

[0032] When the retaining plate 260 is moved in the -X direction and supported by the support part 270, the screw 291 is biased in the opposite direction to the retaining plate 260 by the spring 292, so the screw 291 does not come into contact with the retaining plate 260 through the through hole 293. This allows the retaining plate 260 to be easily moved toward the insertion space IS. When removing the injection unit 230 from the moving unit 240, the screw 291 is loosened and released from the screw hole 264. In this state, the retaining plate 260 is supported by the support part 270 without falling in the -Z direction. Even in this state, the screw 291 is biased in the opposite direction to the retaining plate 260 by the spring 292, so the screw 291 does not come into contact with the retaining plate 260 through the through hole 293. Therefore, the operator can easily remove the injection unit 230 from the moving unit 240.

[0033] According to the injection molding apparatus 10 of the first embodiment described above, the movable part 240 has a support part 270 for supporting a holding plate 260 that holds the injection part 230, and the holding plate 260 is slidably provided with respect to the support part 270. Therefore, when removing the injection part 230 held by the holding plate 260 from the movable part 240, the holding plate 260 is supported by the support part 270, and in that state, the holding plate 260 can be slid away from the support part 270 and moved. Accordingly, when cleaning or maintaining the injection part 230, the injection part 230 can be easily removed from the movable part 240.

[0034] Furthermore, in this embodiment, the injection unit 250 and the mold opening / closing unit 220 are positioned side by side in the direction of gravity. In other words, the injection molding apparatus 10 of this embodiment is configured as a vertical injection molding apparatus 10. According to this embodiment, in such a vertical injection molding apparatus 10, the injection unit 230 can be easily removed from the moving unit. In particular, in this embodiment, the support unit 270 supports the holding plate 260 from vertically below. Therefore, when removing the injection unit 230 from the moving unit 240, it can be easily removed without dropping the injection unit 230. As a result, there is no need to increase the number of personnel to support the injection unit 230 when removing it. Accordingly, the injection unit 230 can be easily removed without increasing the number of workers or other man-hours. In addition, according to this embodiment, the injection unit 230 can be easily removed and easily installed at the same time. Therefore, it becomes easy to attach another injection unit 230 to the injection molding apparatus 10 while the injection unit 230 is being cleaned, thereby minimizing the downtime of the apparatus and improving the manufacturing efficiency of molded products.

[0035] Furthermore, in this embodiment, the nozzle section 320 is equipped with a shut-off pin 334 that moves forward and backward within the nozzle flow path 322. Therefore, the injection molding apparatus 10 can inject materials with relatively low viscosity. As a result, the injection section 230 can be easily removed from the injection molding apparatus 10 that injects materials with low viscosity.

[0036] Furthermore, in this embodiment, the nozzle section 320 is connected to the retaining plate 260, and the injection control unit 330 is connected to the nozzle section 320. With this configuration, there is no need to connect the injection control unit 330 to the retaining plate 260, so the size of the retaining plate 260 can be reduced. As a result, the injection molding apparatus 10 can be made more compact.

[0037] Furthermore, in this embodiment, the shut-off pin drive unit 338, which drives the shut-off pin 334, is connected to the nozzle unit 320 in a direction intersecting the direction in which the nozzle unit 320 and the retaining plate 260 are aligned. Therefore, the possibility of the shut-off pin drive unit 338 interfering with other parts when the retaining plate 260 is slid and moved is reduced. As a result, the injection unit 230 can be easily removed.

[0038] Furthermore, in this embodiment, the injection unit 250 has a fixing mechanism 290 that fixes the retaining plate 260 to the movable part 240. The fixing mechanism 290 includes a screw 291 and a spring 292 provided around the threads of the screw 291. The screw 291 is screwed into a screw hole 264 formed in the retaining plate 260 through a through hole 293 provided in the movable part 240. With this configuration, when removing the screw 291 from the screw hole 264, the spring 292 can reliably separate the screw 291 from the retaining plate 260. Therefore, the injection unit 230 can be easily removed. In addition, in this embodiment, a retaining member 294 is placed at the opening of the through hole 293 into which the screw 291 is inserted. Therefore, the risk of the screw 291 falling or being lost can be suppressed, and the number of steps required to insert the screw 291 into the through hole 293 can be reduced.

[0039] Furthermore, in this embodiment, the retaining plate 260 has a first groove 261 and a second groove 262 of different shapes on its end face 269 in the direction of sliding relative to the support portion 270, and the moving portion 240 has a first restricting portion 281 that contacts the first groove 261 and a second restricting portion 282 that contacts the second groove 262 when the retaining plate 260 is supported by the support portion 270.Therefore, the retaining plate 260 can be accurately positioned relative to the moving portion 240.In particular, in this embodiment, since the first groove 261 is U-shaped and the second groove 262 is V-shaped, even if there are individual errors in the distance between the first restricting portion 281 and the second restricting portion 282, the retaining plate 260 can be accurately positioned on the moving portion 240.

[0040] B. Other embodiments: (B1) In the above embodiment, the injection unit 250 and the mold opening / closing unit 220 are positioned side by side in the direction of gravity. In contrast, the injection unit 250 and the mold opening / closing unit 220 may be positioned side by side in the horizontal direction. In other words, the injection molding apparatus 10 may be configured as a horizontal injection molding apparatus 10.

[0041] (B2) In the above embodiment, the injection molding apparatus 10 is equipped with a shut-off pin 334 and a shut-off pin drive unit 338. However, the injection molding apparatus 10 does not necessarily have to be equipped with a shut-off pin 334 and a shut-off pin drive unit 338. In other words, the injection molding apparatus 10 may be a molding machine that injects a material with relatively high viscosity.

[0042] (B3) In the above embodiment, the nozzle unit 320 is connected to the holding plate 260, and the injection control unit 330 is connected to the nozzle unit 320. Alternatively, both the nozzle unit 320 and the injection control unit 330 may be connected to the holding plate 260.

[0043] (B4) In the above embodiment, the shut-off pin drive unit 338 is connected to the nozzle portion 320 in a direction intersecting the direction in which the nozzle portion 320 and the retaining plate 260 are aligned. Alternatively, the shut-off pin drive unit 338 may be connected to the nozzle portion 320 along the direction in which the nozzle portion 320 and the retaining plate 260 are aligned.

[0044] (B5) In the above embodiment, the injection molding apparatus 10 is provided with a fixing mechanism 290 for fixing the retaining plate 260 to the movable part 240. This fixing mechanism 290 is not limited to a configuration including a screw 291 and a spring 292, but may also be configured without the spring 292. Furthermore, the fixing mechanism 290 may be provided on a support part 270 provided on the movable part 240, rather than on a movable member 241 provided on the movable part 240.

[0045] (B6) In the above embodiment, the retaining plate 260 has a first groove 261 and a second groove 262, and the moving part 240 has a first restricting part 281 and a second restricting part 282. In contrast, the retaining plate 260 does not have to have a first groove 261 and a second groove 262, and the moving part 240 does not have to have a first restricting part 281 and a second restricting part 282.

[0046] (B7) In the above embodiment, the support portion 270 includes a pair of first fasteners 271 and a pair of second fasteners 272. However, the support portion 270 may include only the pair of first fasteners 271, and each fastener included in the pair of first fasteners 271 may have an elongated shape along the X direction. Furthermore, the shape of the first fasteners 271 and the second fasteners 272 is not limited to L-shapes; for example, they may have a configuration in which a slit into which the side end of the retaining plate 260 is inserted is provided on the inner surface.

[0047] C. Other forms: This disclosure is not limited to the embodiments described above, and can be implemented in various configurations without departing from its spirit. For example, the technical features of the embodiments corresponding to the technical features in each of the embodiments described below can be replaced or combined as appropriate in order to solve some or all of the above-described problems, or to achieve some or all of the above-described effects. Furthermore, if a technical feature is not described as essential in this specification, it can be deleted as appropriate.

[0048] (1) According to a first embodiment of the present disclosure, an injection molding apparatus is provided for performing injection molding of a molded product using a mold. The injection molding apparatus comprises an injection unit for injecting material into the mold, and a mold opening / closing unit to which the mold is attached and for opening and closing the mold, wherein the injection unit has an injection section having an injection control unit for controlling the injection of the material and a nozzle section for injecting the material, a moving section for moving the injection unit relative to the mold opening / closing unit, and a holding plate connected to the injection section and holding the injection section, wherein the moving section has a support section for supporting the holding plate, and the holding plate is slidably provided with respect to the support section. With this configuration, the injection unit can be easily removed from the moving part when cleaning or maintaining it.

[0049] (2) In the above configuration, the injection unit and the mold opening / closing unit may be positioned side by side in the direction of gravity. In such a configuration, the injection unit can be easily removed from the moving part in a vertical injection molding apparatus.

[0050] (3) In the above embodiment, the nozzle portion may have a nozzle flow path and a shut-off pin that controls the opening and closing of the nozzle flow path by forward and backward movement. With this embodiment, the injection portion can be easily removed in an injection molding apparatus that injects materials with relatively low viscosity.

[0051] (4) In the above configuration, the nozzle portion may be connected to the retaining plate, and the injection control unit may be connected to the nozzle portion. With this configuration, the size of the retaining plate can be reduced, so the injection molding apparatus can be miniaturized.

[0052] (5) In the above configuration, the injection unit has a shut-off pin drive unit for driving the shut-off pin, and the shut-off pin drive unit may be connected to the nozzle unit in a direction intersecting the direction in which the nozzle unit and the retaining plate are aligned. With this configuration, the possibility of the shut-off pin drive unit interfering with other parts when the retaining plate is slid and moved can be reduced. As a result, the injection unit can be easily removed.

[0053] (6) In the above embodiment, the injection unit has a fixing mechanism for fixing the retaining plate to the moving part, the fixing mechanism includes a screw and a spring provided around the threads of the screw, and the screw may be screwed into a screw hole formed in the retaining plate through a through hole provided in the moving part. With this embodiment, when removing the screw from the screw hole, the spring can reliably separate the screw from the retaining plate, so that the injection part can be easily removed.

[0054] (7) In the above embodiment, the retaining plate has a first groove and a second groove of different shapes on its end face in the direction in which it slides relative to the support, and the moving part may have a first restricting part that contacts the first groove and a second restricting part that contacts the second groove when the retaining plate is supported by the support. With this embodiment, the retaining plate can be positioned with precision relative to the moving part. [Explanation of Symbols]

[0055] 10...Injection molding apparatus, 210...Fixed part, 211...Fixed platen, 212...Movable platen, 213...Tie bar, 220...Mold opening / closing unit, 221...Ball screw, 230...Injection part, 240...Moving part, 241...Movable member, 242...Guide member, 243...Base, 244...Screw shaft, 245...Ball nut, 246...Movement motor, 247...Connecting member, 250...Injection unit, 260...Holding plate, 261...First groove, 262...Second groove, 264...Screw hole, 269...End face, 270...Support part, 271...First fixing device, 272...Second fixing device, 281...First restricting part, 282...Second restricting part, 290 ...fixing mechanism, 291...screw, 292...spring, 293...through hole, 294...retaining member, 310...material flow path, 313...cylinder, 315...check valve, 319...material supply port, 320...nozzle section, 321...nozzle opening, 322...nozzle flow path, 330...injection control unit, 331...injection cylinder, 332...plunger, 333...plunger drive unit, 334...shut-off pin, 338...shut-off pin drive unit, 500...control unit, 900...molding mold, 901...fixed mold, 902...movable mold, 903...heater, 904...gate opening, Cv...cavity, IS...insertion space

Claims

1. An injection molding apparatus that performs injection molding of molded products using a mold, An injection unit for injecting material into the mold, The mold to which the mold is attached, and a mold opening / closing unit for opening and closing the mold, Equipped with, The injection unit is, An injection unit having an injection control unit for controlling the injection of the material and a nozzle unit for injecting the material, A moving part for moving the injection unit relative to the aforementioned opening / closing unit, A retaining plate connected to the injection unit and holding the injection unit, It has, The movable part has a support part that supports the holding plate, The retaining plate is slidably mounted relative to the support portion. Injection molding equipment.

2. An injection molding apparatus according to claim 1, The injection unit and the mold opening / closing unit are positioned side by side in the direction of gravity. Injection molding equipment.

3. An injection molding apparatus according to claim 1, The nozzle portion is Nozzle flow path and A shut-off pin that controls the opening and closing of the nozzle flow path by forward and backward movement, Having, Injection molding equipment.

4. An injection molding apparatus according to claim 3, The nozzle portion is connected to the holding plate, The injection control unit is connected to the nozzle section, Injection molding equipment.

5. An injection molding apparatus according to claim 4, The injection unit has a shut-off pin drive unit that drives the shut-off pin, The shut-off pin drive unit is connected to the nozzle portion in a direction intersecting the direction in which the nozzle portion and the retaining plate are aligned. Injection molding equipment.

6. An injection molding apparatus according to claim 1, The injection unit has a fixing mechanism for fixing the holding plate to the moving part, The fixing mechanism includes a screw and a spring provided around the threads of the screw, The screw is screwed into a screw hole formed in the retaining plate through a through hole provided in the movable part. Injection molding equipment.

7. An injection molding apparatus according to claim 1, The retaining plate has a first groove and a second groove of different shapes on its end face in the direction in which it slides relative to the support portion. The movable part has a first restricting part that contacts the first groove when the holding plate is supported by the support part, and a second restricting part that contacts the second groove. Injection molding equipment.

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