JP6872885B2 - Injection molding machine and its control method - Google Patents

Description

The present invention relates to an injection molding machine.

As disclosed in Patent Document 1, many conventional molding machines are of the in-line screw type and the pre-plunger type, but in each case, the size of the apparatus has been increased. In addition, it may not be possible to meet the dimensional requirements of high-precision molded products, such as changing the on / off of the resin at the confluence of the resin material path and variations in the dimensional accuracy of the molded product due to variations in the drive accuracy of the check valve. ..

In addition, the attachment and detachment of the heating cylinder is large and complicated, and a crane work qualification is required, and a lot of time is wasted on the dismantling and returning work at the site.

Japanese Unexamined Patent Publication No. 2014-136356 Japanese Unexamined Patent Publication No. 11-277592

However, in recent years, there has been an increasing need for miniaturization of equipment due to the idea of a microfactory and the concept of in-line molding machine. Further, there is an increasing need for a molded product with higher precision, and it is required to perform a stable check valve operation to stabilize the dimensions of the molded product.

In addition, at the production site, it was necessary to disassemble and clean the heating cylinder and nozzle between productions, but due to the large size of the equipment, special qualifications such as cranes were required, disassembly was difficult, and it took time to return to production. ..

The present invention has been made in view of this point.
An injection cylinder which the liquid resin was kicked melt injection all rather set from the resin supply section,
A nozzle provided at the tip of the flow path provided inside the injection cylinder and
Provided inside before Symbol injection cylinder, a plunger having a pressing portion at the tip,
Driving means for injection before Symbol nozzle by moving the plunger,
A first shut-off valve was provided, et al in the injection cylinder,
A second on-off valve for supplying resin from the resin supply unit to the injection cylinder is provided.
A first space between the injection cylinder and the plunger on the nozzle side of the first on-off valve,
It has a second space between the injection cylinder and the plunger on the resin supply unit side of the first on-off valve.
By moving the plunger closer to the nozzle, the resin filled in the first space is ejected from the nozzle, and at the same time, the resin is supplied through the second on-off valve by utilizing the pressure difference of the resin. The resin is supplied from the part to the second space,
By moving the plunger away from the nozzle, and characterized by utilizing a pressure difference of the resin through the first shut-off valve for supplying the resin into the first space from the second space Injection molding machine.

According to the present invention, a stable check valve operation can be performed with a simple configuration, and the molding machine can be miniaturized. Further, it is possible to provide an injection mechanism that can be easily disassembled.

It is a front view schematically showing an embodiment in which the injection mechanism according to the present invention is applied to a vertical injection molding machine, and is in a mold clamping state. It is sectional drawing which shows typically one Embodiment which applied the injection mechanism by this invention to a vertical injection molding machine, and the center of the front surface is a cross-sectional line in a mold compaction state. It is sectional drawing which shows typically one Embodiment which applied the injection mechanism by this invention to a vertical injection molding machine, and is the injection enlarged sectional view which shows the state which the plunger is raised in the mold open state. The nozzle is an open nozzle. It is a cross-sectional view schematically showing an embodiment in which the injection mechanism according to the present invention is applied to a vertical injection molding machine, and is an enlarged injection cross-sectional view showing a state in which the plunger is lowered in the mold open state, and is on the resin supply side. Represents a cross section. It is a cross-sectional view schematically showing another embodiment which applied the injection mechanism by this invention to a vertical injection molding machine, is the injection enlarged cross-sectional view which shows the state which the plunger is lowered, and the nozzle is a shut-off nozzle. It is a three-dimensional projection drawing schematically showing one embodiment of the vertical injection molding machine according to the present invention, and is in a mold-opened state. It is a three-dimensional projection drawing which schematically represents one Embodiment of the vertical injection molding machine by this invention, and shows the part of a plunger which pushes a resin. It is a three-dimensional projection drawing schematically showing one embodiment of the vertical injection molding machine according to the present invention, represents the second on-off valve on the resin supply side (merging side), and is in a state where the valve is closed. It is a three-dimensional projection drawing schematically showing one embodiment of the vertical injection molding machine according to the present invention, represents the second on-off valve on the resin supply side (merging side), and is in a state where the valve is open. It is sectional drawing which shows typically one Embodiment which applied the injection mechanism by this invention to a vertical injection molding machine, and the center of the front surface is a sectional line in the mold open state. It is a figure which shows typically one Embodiment which applied the injection mechanism by this invention to a vertical injection molding machine, and shows the type which the resin supply mechanism is automatic in the mold compaction state. It is a figure which shows typically the flow chart of the control of one Embodiment which applied the injection mechanism by this invention to a vertical injection molding machine, and shows the type which the resin supply mechanism is manual. It is a figure which shows typically the flow chart of the control of one Embodiment which applied the injection mechanism by this invention to a vertical injection molding machine, and shows the type which the resin supply mechanism is automatic. It is a figure which shows typically the flow chart of the control of one Embodiment which applied the injection mechanism by this invention to a vertical injection molding machine, and shows the tray type only for automatic purging. It is a figure which shows typically the flow chart of the control of another embodiment which applied the injection mechanism by this invention to a vertical injection molding machine, and shows the type which has a valve on the material supply side. It is a figure which shows typically the flow chart of the control of another embodiment which applied the injection mechanism by this invention to a vertical injection molding machine, and shows the type which attached the motor control mechanism to the material supply. It is a three-dimensional projection drawing schematically showing one embodiment of the vertical injection molding machine according to the present invention, represents a portion of a plunger that pushes a resin, and represents a state in which a valve is lowered against a spring force and opened. It is a figure which shows the three-dimensional figure of one Embodiment which applied the injection mechanism by this invention to a vertical injection molding machine, and shows the gun type which the resin supply mechanism is manual. It is a figure which shows the three-dimensional figure of one Embodiment which applied the injection mechanism by this invention to a vertical injection molding machine, and shows the attachment / detachment of a gun type which the resin supply mechanism manually attaches and detached. It is a figure which shows the three-dimensional figure of one Embodiment which applied the injection mechanism by this invention to a vertical injection molding machine, and shows the attachment / detachment of a heating cylinder. This is the first dismantling procedure. It is a figure which shows the three-dimensional figure of one Embodiment which applied the injection mechanism by this invention to a vertical injection molding machine, and shows the attachment / detachment of a heating cylinder. The second of the dismantling procedures is a view in which the heating cylinder is tilted. It is a figure which shows the three-dimensional figure of one Embodiment which applied the injection mechanism by this invention to a vertical injection molding machine, and shows the attachment / detachment of a heating cylinder. It is the third of the dismantling procedure, and is the figure which removed the heating cylinder. It is an injection enlarged perspective view schematically showing two embodiments in which the injection mechanism according to the present invention is applied to a vertical injection molding machine, and the nozzle is an open nozzle. It is a nozzle that touches the mold on the surface, and the resin outlet is a replaceable figure. It is an injection enlarged perspective view schematically showing two embodiments in which the injection mechanism according to the present invention is applied to a vertical injection molding machine, and the nozzle is an open nozzle. It is a nozzle that touches the mold on the surface, and the resin outlet is a replaceable figure. It is the figure which the flow path part is cut in an easy-to-understand manner. It is an enlarged perspective view schematically showing two embodiments which applied the injection mechanism by this invention to a vertical injection molding machine, and is the figure which looked at the front of the apparatus from diagonally below. The mold has been removed and the open nozzle is visible.

An embodiment in which the injection mechanism according to the present invention is applied to a vertical injection molding machine is shown in FIGS.
This will be described in detail with reference to FIG. However, the present invention is not limited to such embodiments.
Any modification or modification included in the concept of the invention described in the claims may be made.
Therefore, it can be naturally applied to any other technique belonging to the spirit of the present invention.

FIG. 1 is a front view schematically showing an embodiment in which the injection mechanism according to the present invention is applied to a vertical injection molding machine, and is in a mold clamping state.

Hereinafter, the injection section will be described first. The injection motor 20 rotates the driven pulley 45 via the drive pulley 46 and the injection belt 21, and power is transmitted to the injection ball screw 17, so that the screw shaft moves up and down. The plunger guide plate 35 connected to the screw shaft is guided to the guide post 34. The plunger 25 is screwed to the plunger guide 35 from the bottom to the top by the plunger holder 48. The load in the screw axis direction is received by the injection bearing 52 and the injection ball screw 17.

The resin stored in the dispenser 69 is extruded to the left side in FIG. 4 by a material extruder, passes through a branch point 63, and is sent to a fixed mixer 30 for mixing. A plurality of resin materials are stored in the dispenser 69, and two types of resin materials are mixed and reacted, a colorant is mixed like a master batch, and a plurality of ratios of 1: 1 are changed to 4: 1. Items with different ratios can be attached and detached and can be ejected. When the predetermined amount has been used, the dispenser 69 can be replaced to enable re-injection.

The mixer 30 is preferably one in which an iron plate is twisted like a normal static mixer, that is, one in which a plurality of elements for promoting kneading of a resin material are laminated. The shape is not limited to the static mixer, and any shape may be used as long as it promotes kneading. The mixer 30 is housed in the mixer holder 33, sandwiched between the mixer 30 and the check holder 31, and sealed so that there is no resin leakage.

Here, FIG. 8 is a three-dimensional projection drawing schematically showing an embodiment of a rigid injection molding machine according to the present invention, showing a second on-off valve on the resin supply side (merging side), and the valve is closed. It shows the state. As shown in FIG. 8, it is effective to provide an O-ring 14 or the like at the contact portion of the mixer 30 so that the liquid resin can be sealed.

The resin that has passed through the mixer 30 is kneaded, has a uniform distribution, and moves to the confluence passage 62.
At the end of the merging passage 62, the second on-off valve 32 can be slightly moved in the flow direction. The second on-off valve 32 has a spindle shape along the flow direction, and the back side in the flow direction is a surface. When pressure is applied in the feeding direction, the second on-off valve 32 slightly moves toward the back side. The amount of fine movement is preferably changed depending on the size of the valve in the moving direction depending on the resin material used, and is preferably about 0.5 to 3 mm. When moved to the back side, a gap is formed between the valve claw 15 and the valve claw 15 which is guided by the outer circumference of the second on-off valve 32. The valve claw 15 has a shape similar to a bird's claw and has four claws. That is, the structure is such that the valve claw 15 appears to grip the second on-off valve 32, and the resin flows out from between the claws. The number of these nails does not matter.

On the contrary, when the resin is about to be returned from the back side, the second on-off valve 32 is pressed against a similar spindle-shaped hole to seal it. By configuring the second on-off valve 32 in this way, the resin does not flow back.

Since the ease of flow changes depending on the viscosity of the resin material, the amount of fine movement of the second on-off valve 32 may be adjusted at the time of assembly as described above. In the case of a liquid resin, about 0.5 mm is preferable.

In the above embodiment, the second on-off valve 32 is of a type that opens and closes depending on the difference in resin pressure before and after the valve, but it may be forcibly opened and closed by an external power such as a solenoid valve or an air valve. I do not care. This is preferable when supply accuracy is required.

The resin material is sent to the injection cylinder 1 through the material supply port 23. Regarding the method of supplying the resin material, a manual gun type, that is, a dispenser 69 may be used, or a device such as a liquid thermosetting resin that automatically pumps and controls the discharge amount is used. It may accompany. FIG. 11 shows a fully automatic pump weighing type device configuration, and FIG. 13 shows the control at that time. A solenoid valve is attached to the supply device in the supply path from the dispenser 69 to the injection cylinder 1 to switch the supply ON / OFF, and a degassing device is interposed in front of the injection cylinder 1 to inject resin bubbles into the injection cylinder 1. Before supplying to, pull out in advance and then supply. The degassing device is preferably a separated air using centrifugal force or the like. The transporting force of the resin material is various, such as one that transports by air pressure and a device of a mechanism that sends by an electric pump, and any device can be supported by connecting an IO signal.

The configuration of the resin material after being supplied to the injection cylinder 1 will be described with reference to the enlarged cross-sectional views of FIGS. 3 and 4. The resin sent to the injection cylinder 1 is heated by the band heater 2 and melted. In the case of a thermosetting resin, it is cooled not by the band heater 2 but by something like a cooling holder in which a temperature control pipe is processed. In that case, attach a water pipe and a hose to the holder, and control the temperature with an external temperature controller. It is even more preferable that the injection cylinder 1 is machined with a 3D pipe to directly control the temperature. In the case of a low-pressure resin pressure dedicated machine, this configuration is preferable because strength that can withstand the resin pressure is not required.

The outer diameter of the plunger 25 is set smaller than the inner diameter of the hole of the injection cylinder 1 in consideration of the material supply port 23, and the resin material passes through the gap in front of the plunger head 26 (lower side in FIG. 3). Will be sent to. When the plunger 25 rises, it is sent to the front of the plunger head 26, that is, to the room (space) of the cylinder resin flow path 61 and the space of the nozzle resin flow path 60 in FIG.

A spring 29 is provided above the plunger head 26 in FIG. 3, and a first on-off valve 28 is provided above the spring 29. The first on-off valve 28 is slidable up and down, and a resin hole guide ring 27 is provided on the first on-off valve 28. FIG. 7 shows a stereoscopic projection drawing of the plunger 25.

The resin hole guide ring 27 has innumerable flow path holes, through which the resin is sent downward. The first on-off valve 28 is constantly pressed against the resin hole guide ring 27 by the urging force of the spring 29, and the flow path hole of the resin hole guide ring 27 is blocked. When the pressure flowing into the flow path hole becomes stronger, the force of the spring 29 is resisted, the first on-off valve 28 is lowered, the seal is released, the outer circumference of the first on-off valve 28 is passed, and the outer periphery of the plunger head 26 is used. , Flows down. FIG. 17 shows the state. When the backflow is attempted (the resin tries to go upward), the first on-off valve 28 rises upward, blocks the flow path hole of the resin hole guide ring 27, and prevents the resin from returning. Therefore, the plunger head 26 always contains a new resin and has a first-in first-out structure, so that there is no problem of resin retention or burning.

Further, the urging force of the spring 29 can suppress the variation in the pressure difference in the resin flow. Therefore, it becomes easy to appropriately manage the amount of the resin material sent to the plunger head 26 side (cylinder resin flow path 61). If only the valve is released due to the pressure difference of the resin before and after the first on-off valve 28, in the case of a liquid viscous material such as water, the amount flowing to the plunger head 25 side varies, and the inflow amount changes to the molded product. The filling pressure will change, and stable molding will not be possible. In the present embodiment, by urging the first on-off valve 28 to the resin guide ring 27 with a predetermined pressing force by the spring 29, the inlet can be forcibly shut off and an unstable pressure difference can be assisted. ..

Here, the injection pressure is P1, and the force of the spring 29 is F. Assuming that the resin pressure at the tip of the plunger head 26 is P2, when P1> F + P2, the first on-off valve 28 is lowered, the flow path is opened, and the resin material flows downward.

The plunger 25 is protected from backflow of resin by a seal 65 press-fitted into the inner hole of the injection cylinder 1. Further, a bush 64 is press-fitted into the inner hole of the injection cylinder 1 on the seal 65, and the outer circumference of the plunger 25 is guided to the inner circumference of the bush 64 and slides. The bush 64 is preferably a metal bush and serves as a guide on the upper side of the plunger 25 that moves up and down.

Further, the plunger 25 is guided by the outer circumference of the resin hole guide ring 27 on the first on-off valve 28 and the inner hole of the injection cylinder 1 and slides. This serves as a guide for the lower side of the plunger 25. The wider the distance between the upper and lower guides, the higher the vertical sliding accuracy (coaxial accuracy, tilt accuracy) of the plunger 25. The lower the plunger 25, the better the sliding accuracy. On the device, a load is applied to the resin, and what is most desired to be a guide is a state in which the plunger is lowered and a reverse reaction force is applied due to the resin pressure, and this mechanism tends to be accurate at that time. Therefore, when the resin has a high pressure, the sliding accuracy is improved and the resin leakage can be reduced. In addition, the dimensional accuracy of the guide is easy to manage. By widening the top and bottom, the outer diameter accuracy without the bush 64, the inner diameter accuracy of the injection cylinder 1, and the outer diameter accuracy of the plunger can be made rough, and not only the bush 64 alone but also the total cost of the device can be reduced.

Due to the vertical movement of the plunger 25, a pressure difference is created before and after the flow path with the first on-off valve 28 as a boundary. When the plunger 25 rises, the pressure in the space of the resin flow path under the plunger 25 (the lower side of the first on-off valve 28 and the nozzle side) becomes lower, and the pressure on the opposite side becomes higher. The resin flows from the higher pressure side to the lower pressure side. At that time, if the flowing force is stronger than the force of the spring 29, the resin is sent to the space (nozzle side) of the resin flow path. In addition, the valve on the material supply side is also released and pulled into the plunger 25 side.

When the plunger 25 begins to descend, the pressure in the space (nozzle side) of the resin flow path under the plunger 25 becomes high, and the pressure on the opposite side becomes low. The resin tries to go from the higher pressure side to the lower pressure side. that time,
The force of the spring 29 causes the first on-off valve 28 to move against the flowing force and block the flow path of the resin hole guide ring 27. The amount of resin sent to the space (nozzle side) of the resin flow path is the measured value. The smaller the difference between the forward and reverse timings, the more stable the measured value. Therefore, the spring is urged. In addition, the valve on the material supply side closes due to pressure and does not flow back.

An open nozzle 4 is attached to the tip of the injection cylinder 1, and resin is discharged from the nozzle resin outlet 36. The convex portion of the open nozzle 4 and the concave portion of the locating ring 38 both have a spherical shape and come into contact with the ridgeline. Normally, the R of the convex portion of the open nozzle 4 and the R of the locating ring 38 are set to be larger. 3 and 4 show a picture of a mold-opened state in which the convex portion of the open nozzle 4 and the concave portion of the locating ring 38 are not in contact with each other. In this state, heat is separated and there is no heat conduction. In this state, it is preferable that the open nozzle 4 and the locating ring 38 are insulated by reducing the contact area. In the present embodiment, as shown in FIG. 4, a heat insulating material 37 is sandwiched between the fixed platen 3 side to be fitted with the locating ring 38 to form a separate part so that heat is not transferred.

FIGS. 23 and 24 show a diagram in which the tip of the convex portion of the open nozzle is not spherical but flat. This is the second embodiment in which the mold is in surface contact with the mold. Details will be described later.

A cylinder back plate 47 is bolted to the injection cylinder holder 39 on the upper part of the injection cylinder 1 via a nozzle touch spring 49. When the mold is tightened and the nozzle is touched, it is pressed against the locating ring 38 by the urging force of the nozzle touch spring 49, and is sealed so that there is no resin leakage. The urging force of the nozzle touch spring 49 is preferably changed according to the resin material to be produced. Since no special power is required and the spring force and mold clamping force are used, the structure is simple and the entire device can be miniaturized. According to FIG. 6, the cylinder back plate 47 is screwed with bolts, but the front side is open. That is, it escapes from the plunger 25 in the U groove, and it is easy to attach / detach and replace it. The attachment / detachment method will be described with reference to FIGS. 18 to 22.

FIG. 5 is a cross-sectional view schematically showing another embodiment in which the injection mechanism according to the present invention is applied to a rigid injection molding machine. It is an injection enlarged cross-sectional view showing a state processed by a plunger, and as shown in FIG. 5 in which a shut-off nozzle 5 is mounted as a nozzle, a spring is built in the rear part of the nozzle head, and a pin moves in and out up and down. A type that blocks resin materials. It is a mechanism that the pin moves up and down by using the pressure difference of the resin material. The tip of the shut-off nozzle 5 forms a minute tapered portion and fits with the nozzle plate 16.

In FIGS. 23 and 24, the tip of the convex portion of the open nozzle 4 is not spherical but flat, and the exchange outlet 72 is provided at the discharge port of the resin material to be separated. The mold is a second embodiment in which the mold is in contact with the surface. The replacement outlet 72 has a hexagonal screw shape, and is screwed upward from the bottom of the device into the convex portion of the nozzle. A female thread is cut on the convex portion of the nozzle, and the nozzle is screwed with the replacement outlet 72. A nozzle resin outlet 36, which is a hole through which the resin passes, is provided in the center of the exchange outlet 72. In the present embodiment, the diameter can be selected from φ0.5 to 2.0 depending on the resin to be produced and replaced. Since the screw head has a hexagonal shape, it can be attached and detached with a box wrench or the like.

The glass-containing resin and the long-fiber resin were treated as consumables because the flow path of the portion corresponding to the nozzle replacement outlet 72 was severely worn. Once worn, the molding conditions change and the dimensions of the molded product change, making stable production impossible. In the past, it was necessary to remove the nozzle and heating cylinder from the device and discard the nozzle. Further, due to the difference in the flow path diameter of the nozzle resin outlet 36, a difference in residual pressure may occur, stringing may occur, and production may be stopped. By exchanging only the exchange outlet 72 of the flow path, it is possible to cope with liquid molding in which the viscosity of the resin material is about water, and it is not necessary to dispose of the entire nozzle. Further, even if the resin flow path diameter is worn by a resin containing glass or the like, the heating cylinder or nozzle can be replaced as it is without removing it from the device.

The exchange will be described below. FIG. 25 is a perspective view of the rigid injection molding machine of the present embodiment looking up from below, and is a state in which the mold is removed. As long as the mold is removed, the convex portion of the nozzle can be easily accessed, and the replacement outlet 72 can be replaced with a wrench. Therefore, it is possible to deal with the occurrence of stringing or the like simply by exchanging the exchange outlet 72 without stopping the production. If you do it with the mold open, the space will expand and it will be easier to work. The smaller the replacement outlet 72 is made of, the cheaper it can be made, the easier it is to replace and procure, and the lower the running cost. If a sealing material is placed in the hexagonal head of the replacement outlet 72 and combined with the surface of the open nozzle 4, resin leakage can be prevented. Further, if a precision fitting portion is provided in a part of the screw portion, the sealing property is improved and there is no resin leakage.

18 and 19 show a method of attaching and detaching the manual dispenser 69 for supplying the material. The dispenser 69 is a system capable of mixing two liquids, and FIG. 18 shows a type in which one-to-one volume of resin is pushed by two syringes. Resin enters the inside of the two cylindrical cylinders and is pushed out from the rear like a piston. A cylinder having a different shape and having a variable capacity ratio is commercially available, and a resin can be sealed therein. There is a male screw at the tip of the dispenser 69, which is screwed with the female screw of the retain nut 74. When fixing the dispenser 69, tighten the retain nut 74.

FIG. 19 shows a state in which the dispenser 69 is removed. A retain nut 74 can slide in the flow direction of the cartridge joint 73, and the dispenser 69 side has a tapered diameter to prevent it from coming off. The hole diameter of the cartridge joint 73 on the dispenser 69 side fits with the tip of the dispenser 69. It is preferable to have a fitting diameter that allows precision fitting and can be inserted at a level where it can be pushed in by hand. When installing the dispenser 69, push it into the hole diameter on the dispenser 69 side of the cartridge joint 73 to fit it, shift the retain nut 74, and use the male screw at the tip of the dispenser 69 (behind the fitting portion) and the retain nut 74. Screw in.

The retain nut 74 has blades on the outer diameter, does not require a special tool, and has a shape that is easy to turn by hand. The cartridge joint 73 has a female screw on the mixer holder 33 and is screwed. In FIG. 19, a two-way wrench is formed near the screw portion, and a spanner can be inserted and tightened using this. It is preferable that the screw of the retain nut 74 is a tapered screw for piping so that there is no resin leakage.

In this way, the fitting portion at the tip of the dispenser 69 and the screw can be attached and detached simply by turning the retain nut 74, which facilitates the maintenance work. No special tools are required and it is easy to turn by hand.

The method of attaching and detaching the injection cylinder 1 will be described with reference to FIGS. 20, 21 and 22. Before work, first remove the mold.

FIG. 20 shows the initial state of the dismantling work. First, the cylinder osae 40 and the nozzle wedge block 71 are removed. The cylinder osae 40 has a U groove, escapes the path outer diameter of the mixer holder 33, suppresses the flange portion (connecting side with the injection cylinder 1) of the mixer holder 33, and prevents the entire material supply mechanism from shifting. It is pressed against the holder 39. The outer diameter of the injection cylinder 1 and the U groove of the injection cylinder holder 39 are fitted to position the injection cylinder 1 (in the Y-axis direction when viewed from the front of the device). When the cylinder osae 40 is attached, positioning in XY is possible. It is preferable that there is a minute gap between the cylinder holder 40 and the injection cylinder holder 39, and the cylinder holder 40 comes into contact with the flange portion (connecting side with the injection cylinder 1) of the mixer holder 33 and is sandwiched. Specifically, it is preferable that the gap is a gap that takes into account thermal expansion. When the screw that holds the plunger 25 from the bottom to the top of the plunger guide 35 of the plunger holder 48 is removed, there is no support for the plunger 25 in the upward direction, and the plunger 25 slides into the injection cylinder 1 and falls, and the resin is removed. It goes down to the remaining part.
Remove the screw fixing the nozzle osae 70.

FIG. 21 shows the second state of the dismantling work. When the nozzle osae 70 is removed and the fixing screw of the triangular shaped cylinder back plate 47 is loosened, the cylinder back plate 47 is lifted by the force of the nozzle touch spring 49 underneath. As it is, the units constituting the injection cylinder 1 are tilted as shown in FIG. The triangular shaped cylinder back plate 47 has a U-groove so that it can be tilted with the plunger 25 inserted.

When it is further tilted and pulled out upward, the injection cylinder 1 is disengaged together with the unit as shown in FIG. A space from which the nozzle osae 70 has been removed and an escape space that can be tilted to the fixed plate 3 are provided so that the open nozzle 4 does not collide. If only the plunger 25 is to be replaced, it can be detached and replaced in the state shown in FIG. 21 by simply tilting it.

If you cover the outer diameter of the tip of the open nozzle 4 with a protective cap (made of resin) before dismantling, the precision fitting part with the mold will be protected, and even if you accidentally hit it when tilted, it will be scratched. There are no dents.

If the dispenser 69 is removed in advance, the work will be easier. Since the entire unit is small, it is not very heavy and even women can easily replace it. Since it is easy for anyone to exchange by following the manual, there is no need to call a service person one by one. By preserving another set of injection cylinder units, continuous molding can be performed without stopping production.

The installation proceeds in the order of FIGS. 22, 21, and 20 in the reverse order of the above description. First, the injection cylinder unit is inserted diagonally.

Although the fitting portion U groove of the injection cylinder 1 and the injection cylinder holder 39 is not described in the figure, the injection cylinder 1 has a D shape and is positioned at the abutting portion of the D and the bottom of the U groove. It is a detent. Next, the cylinder osae 40 is attached and temporarily tightened with bolts. After that, the nozzle osae 70 and the nozzle wedge block 71 are attached.

Screw the plunger holder 48 from the bottom to the top toward the plunger guide 35 to hold the plunger 25 at the top. When the fixing screw of the triangular shaped cylinder back plate 47 is tightened, the cylinder back plate 47 is lowered. The injection cylinder 1 is urged downward by the force of the nozzle touch spring 49 below it. Finally, the unit is firmly fixed by retightening with the bolts of the cylinder osae 40.

It is preferable that the cylinder osae 40 is in contact with the flange portion (connecting side with the injection cylinder 1) of the mixer holder 33, and the injection cylinder 1 is sandwiched between the injection cylinder holder 39, and the fitting in consideration of thermal expansion is preferable.

Further, after the mold is attached, if the cylinder is retightened with the bolt of the cylinder osae 40, the unit is further firmly fixed based on the mold.

As described above, the injection cylinder 1 can be easily attached and detached. A replacement work time of 20 to 40 minutes is sufficient. No special qualifications required, no special tools required.

Although the dispenser 69 has been described in this embodiment, it may be connected to an automatic material feeder. In the case of thermosetting liquid resin molding, if a pipe having a tapered diameter that matches the female screw of the retain nut 74 is used and the same idea as described above is incorporated, attachment / detachment is easy. The outer diameter of the retain nut 74 may be any shape as long as it has a shape that can be easily turned by hand. The cartridge joint 73 has a female screw on the mixer holder 33 and is screwed.

This will be described below in the mold clamping section. As described above, FIG. 1 is a schematic view showing a mold clamping state of a mold clamping mechanism portion of a vertical injection molding machine to which the present invention is applied. FIG. 1 shows an example in which a single toggle link mechanism is adopted, showing a mold open state, and will be described below in a mold clamping portion.

The single toggle link mechanism of FIG. 1 is applied to a relatively small molding machine. The fixed platen 3 to which the fixed side mold 10 is attached is fixed to the upper part of the tie bar 24, and the movable platen 9 to which the movable side mold 7 is attached is held in a form guided by the tie bar 24, and is held in the fixed side mold 10 direction and its direction. It can be moved in the opposite direction to the anti-fixing side, and is attached by a bush 64 or the like without rattling. The other end of the tie bar 24 fixed to the fixed platen 3 is fixed to the base plate 41. The opening and closing operation of the mold is performed by the toggle link mechanism, and the upper 18 of the toggle link mechanism is attached to the movable platen 9 and is rotatably connected to the lower 19 of the toggle link mechanism.

The link shaft long 59 shown in the cross-sectional view of FIG. 2 is fixed to the member from the base plate 41, and the toggle link mechanism lower 19 rotates around the link shaft long 59 as a fulcrum. Below the toggle link mechanism lower 19, a link cam follower 50 (see FIG. 1) is connected to a drive unit for operating the toggle link mechanism. The drive unit is a mold clamping motor 43, a mold clamping ball screw 42 connected to the mold clamping motor 43 with a belt and a pulley, and a nut holder 51 is connected to a ball screw nut screwed into the mold clamping ball screw 42. It is composed of things. The nut holder 51 has a block that receives the link cam follower 50 in the front-rear direction, and when the mold clamping ball screw 42 moves back and forth, the force is transmitted to the link cam follower. In the embodiment of the present invention, the drive is driven by a servomotor, but the drive source may be a hydraulic or pneumatic cylinder or the like, and is not particularly limited.

The mold clamping ball screw 42 is rotated via the rotary power belt and pulley of the mold clamping motor 43 as a drive source, and the screwed nut is moved along the axis of the ball screw.

As shown in the cross-sectional view of FIG. 2, the mold clamping force is generated when the toggle link mechanism upper 18 and the toggle link mechanism lower 19 are in a straight line. Actually, when the fixed mold 10 and the movable mold 7 are completely closed just before the toggle link mechanism upper 18 and the toggle link lower 19 become a straight line, and the toggle link mechanism is fully extended from there. The tie bar 24 is stretched by the amount of movement in the upward direction, and the mold clamping force is generated by the elastic force generated by the stretch of the tie bar 24.

After the mold clamping is completed, the injection / cooling process is completed, the mold clamping motor 43 rotates in the direction opposite to that at the time of mold clamping, and each part of the toggle link mechanism operates in the opposite direction to the mold clamping process to complete the mold opening operation. Then, the product is discharged and a series of molding processes are completed. The state of FIG. 10 is the mold opening state. The link mechanism is folded.

<Control method of material supply amount>
The supply of the resin material to the injection mechanism in the present embodiment will be described below. In this embodiment, a liquid material is injected into a mold and the temperature of the mold is raised to thermally cure the material. The control will be described in detail below.

<Control method of material supply (manual supply)>
In this embodiment, a liquid material is injected into a mold and the temperature of the mold is raised to thermally cure the material. The control will be described in detail below. FIG. 12 is a flowchart showing an example of material supply to the injection unit and the cylinder.

It is assumed that the mold clamping is completed at the start point of the flowchart, and the injection cylinder 1 is filled with the resin material. Further, the resin material is supplied to the material supply port 23 by the operator using an injection device such as an injection gun type. Hereinafter, a method of controlling material supply will be described along the flow of FIG.

In step S101, the injection motor 20 is driven, the plunger 25 is lowered to the lowered position, and the resin inside the injection cylinder 1 is injected into the mold 10 and the mold 7 via the open nozzle 4.

In step S102, the position of the plunger 25 is maintained and the holding pressure time elapses. This holding time can be freely set by the user. If the resin material drips from the nozzle resin outlet 36 of the open nozzle 4 when the mold is opened, the injection motor 20 is moved in the reverse direction again after the holding pressure time has elapsed, and so-called suckback is performed to slightly raise the injection motor 20 to perform a so-called suckback. By removing the residual pressure of, the resin material can be prevented from dripping from the tip of the nozzle.

In step S103, the injection motor 20 is driven and raised to the plunger 25 supply position. Here, the supply position is a position where the injection amount / plunger diameter is increased from the descending position. The user can set the desired position according to the size of the molded product. Larger size articles are raised to the appropriate position. By inputting the weight and volume of the molded product on the user interface, the amount of suckback can be automatically controlled. The operator supplies the resin material from the material supply port 23 while the plunger 25 is rising. The timing at which the worker supplies the material may be notified to the worker by a signal tower, a display panel, or the like. Further, in this embodiment, since the above-mentioned second on-off valve 32 is used, it is not necessary to control the valve, but here, a device configuration using compressed air or an electric switching valve may be used. In that case, the switching valve may be opened before step S103, and the switching valve may be closed after the plunger 25 has risen to the supply position.

The above is the operation of one cycle. If molding is to be continued, the molding may be performed again from step S101 after molding.

<Control method of material supply (automatic supply)>
FIG. 13 is a flowchart showing another example of material supply to the injection unit and the cylinder.

It is assumed that the mold clamping is completed at the start point of the flowchart, and the injection cylinder 1 is filled with the resin material.

The pressure Pd for pushing the material supply of the external supply device to the injection cylinder 1 is larger than the required pressure Po for opening the check valve in the second on-off valve 32 and lower than the required pressure Pn for nozzle injection in the first on-off valve 28. That is, it is assumed that Pn> Pd> Po.

It is assumed that the mold clamping is completed at the start point of the flowchart, and the injection cylinder 1 is filled with the resin material. Further, the resin material is supplied to the material supply port 23 by the material supply machine. The supply device is provided with a solenoid valve in the supply path to switch the supply ON / OFF, an degassing device is interposed in front of the injection cylinder 1, and air bubbles of the resin material are removed before being supplied to the injection cylinder 1 before being supplied. .. The degassing device is excellent in separating air using centrifugal force. There are various transporting forces of resin, such as those that transport by air pressure and devices with a mechanism that feeds by an electric pump, and any device can be supported by connecting an IO signal.

The material feeder is electrically connected to the molding machine by an IO signal or a communication signal, and the supply and stop of the resin material can be switched according to the instruction of the molding machine. Hereinafter, a method of controlling material supply will be described along the flow of FIG.

In step S121, the injection motor 20 is driven, the plunger 25 is lowered to the lowered position, and the resin material inside the injection cylinder 1 is injected via the nozzle portion.

In step S122, the position of the plunger 25 is maintained and the holding pressure time elapses. This holding time can be freely set by the user. If the resin material drips from the open nozzle 4 when the mold is opened, the injection motor 20 may be slightly raised after the holding pressure time has elapsed to lower the resin pressure inside the nozzle, so-called suckback.

In step S123, the mold clamping portion waits for the mold opening operation. It is not necessary to wait until the mold opening operation is completely opened, and it is sufficient that there is a gap between the cassette type fixed side template 10 and the open nozzle 4.

In step S124, the external material feeder is instructed to supply the material.

In step S125, it waits for the plunger rise delay time to elapse. The plunger rise delay time waits for a time from when the material supply machine is instructed to supply the resin material until the resin material is actually extruded into the material supply port 23. In this example, it is set to 100 ms. Since the optimum set value of this time varies depending on the material feeder to be used, the operator may freely set it when using a plurality of material feeders properly.

In step S126, the injection motor 20 is driven to raise the plunger 25 to the supply position. Here, the supply position is a position where the injection amount / plunger diameter is increased from the descending position. Further, in this embodiment, since the check valve is used for the first on-off valve 28, it is not necessary to directly control the valve, but a compressed air or electric switching valve may be used. In that case, it is advisable to open the switching valve before step S124.

In step S127, the supply stop delay time waits for elapse. The supply stop delay timer waits for the time until the resin material is completely filled in the plunger 25 after the plunger 25 has stopped rising. In this example, it is set to 100 ms.

In step S128, the external material feeder is instructed to stop the material supply.

The above is the operation of one cycle. If molding is to be continued, it may be carried out from step S121 after molding.

<Control method of material supply (purge operation)>
FIG. 14 is a flowchart showing an example of a purging operation for the injection unit and the cylinder.

When the molding is repeated, it is assumed that the air generated from the resin material remains in the injection cylinder 1 or some of the resin material is not discharged and remains in the injection cylinder. The purpose of this purging operation is to discharge these residual air and residual resin from the inside of the injection cylinder 1.

This purging operation is performed before and after material injection. In this embodiment, the execution frequency is assumed to be once every several cycles, but it may be executed every time, and the frequency may be other than that. Further, the execution frequency may be freely changed by the operator or may be such that the optimum execution frequency is automatically selected according to the material used.

In this embodiment, it is assumed that the mold clamping is open at the start point of the flowchart and there is a space under the open nozzle 4. The purge tray is attached to the actuator and is provided so as to be able to move between the lower part of the open nozzle 4 and the outside of the movable range of the mold clamping. The actuator of the purge tray may be any actuator as long as it can move as described above. For example, a cylinder driven by compressed air as a drive source may be used, or an electric motor may be used.

It is assumed that the injection cylinder 1 is filled with a resin material. Hereinafter, a method of controlling material supply will be described along the flow of FIG.

In step S141, it is determined whether to perform the purge operation. If the purge operation is executed by setting the execution frequency, the process proceeds to step S142, and if the normal molding operation is performed without performing the purge operation, the process proceeds to step S146.

In step S142, the purge tray is moved to the purge position. The purge position is a position where the purge tray is located at the lower part of the open nozzle 4.

In step S143, the injection motor 20 is driven to lower the plunger 25 to the lowest point of the injection cylinder 1. In this embodiment, the lowering position of the plunger 25 at the time of purging is set as the lowest point, and the lowering position of the plunger 25 at the time of molding is set as the injection position, but these two may be the same position.

In step S144, it waits for the purge holding time to elapse.

In step S145, the purge tray is moved to the standby position. The standby position is a position where the purge tray does not interfere with the device during mold clamping. The discharged resin material remains on the purge tray, which may be removed by the operator, or an actuator may be further attached to the purge tray to cause the discharge operation. Any operation may be performed as long as the resin material is removed. For example, it is possible to perform an operation such as turning, turning the purge tray by 180 ° C., and dropping the resin material into the waste material container attached to the lower part of the standby position. Alternatively, the discharge route to the waste material container may communicate with the purge tray as it moves to the standby position, and the resin material may be removed from the purge tray by moving to the standby position. Although the shape of the purge tray is not shown, it may be box-shaped or plate-shaped. If you make it into a box shape and put a glass window on the side, you can see from the outside whether the resin has come out or not. It is preferable that the handle of the tray is connected to the Robo cylinder.

In step S146, the mold clamping portion starts the mold clamping operation. After that, steps S147 to S151 are performed in parallel with the mold clamping operation.

In step S147, the external material feeder is instructed to supply the material.

In step S148, the plunger rise delay time waits for elapse. The plunger rise delay time waits for a time from when the material supply machine is instructed to supply the resin material until the resin material is actually extruded into the material supply port 23. In this example, it is set to 100 ms. Since the optimum set value of this time varies depending on the material feeder to be used, the operator may freely set it when using a plurality of material feeders properly.

In step S149, the injection motor 20 is driven to raise the plunger 25 to the supply position. Here, the supply position is a position raised by the injection amount / plunger diameter + (injection position-minimum lowering position) from the lowest descending position. Further, in this embodiment, since the check valve is used for the first on-off valve 28, it is not necessary to control the valve, but here, a switching valve by compressed air or electric power may be used. In that case, it is advisable to open the switching valve before step S149.

In step S150, the supply stop delay time waits for elapse. The supply stop delay timer waits for the time until the resin material is completely filled in the plunger 25 after the plunger 25 has stopped rising. In this example, it is set to 100 ms.

In step S151, the external material supply machine is instructed to stop the material supply.

The above is the operation of one cycle when the purge operation is performed. When the molding is continued, it may be carried out from step S121 of the above-described embodiment. If the purging operation is to be repeated, it is repeated from step S141. When purging continuously, it is not necessary to start mold clamping in step S146 except for the final cycle.

In the vertical injection molding machine of the present embodiment described above, as shown in FIG. 21 and the like, the injection cylinder 1 is configured to be removable from one side with respect to the injection cylinder holder 39, and the injection cylinder 1 is further attached to the injection cylinder. Since it has a simple structure that uses the spring force and mold clamping force when mounting and fixing to the holder 39, it is easy to attach / detach the injection cylinder 1 and subsequent cleaning (maintenance), which is extremely advantageous for miniaturization of the entire device. Configuration. Further, in the vertical injection molding machine of the present embodiment, as shown in FIG. 4 and the like, the tip portion of the plunger 25 is simply driven and controlled in the injection cylinder 1 and moved up and down in the axial direction thereof. The pressure difference between the material supply (upstream) side space and the material injection side (downstream) side space in the injection cylinder 1 can be easily adjusted by operating the first on-off valve 28 provided in the plunger head 26 connected to the injection cylinder 1. Therefore, the material supply and the injection operation can be efficiently performed without complicating the configuration of the injection cylinder 1, which is also effective for miniaturization of the apparatus. Further, as described in the above embodiment, a toggle link mechanism (single toggle link) is used for mold clamping of the mold, and a mold clamping force is easily generated only by turning 19 under the toggle link mechanism. By adopting this structure as well, the entire device can be further miniaturized.

<Control method of material supply (automatic operation valve control)>
(Second Embodiment)
FIG. 15 is a flowchart showing an example of injection operation to the injection unit and the cylinder. Unlike the embodiments described so far, the supply unit (first on-off valve 28) of the injection cylinder 1 uses a switching valve that operates by compressed air or electric power instead of a check valve. Further, a switching valve operated by compressed air or electric power is also used between the open nozzle 4 and the cassette type fixed side template 10. Compared with the above embodiment, the outflow of the resin material from the open nozzle 4 and the backflow of the resin material from the check valve portion are less likely to occur due to the pressure difference during material supply.

The valve installed in the material supply section (first on-off valve 28) of the injection cylinder 1 is a material supply valve, and the valve installed between the open nozzle 4 and the cassette type fixed side template 10 is a nozzle valve.

In this embodiment, it is assumed that the mold clamping is closed at the start point of the flowchart. It is also assumed that both the material supply valve and the nozzle valve are closed. For external material supply, give a supply instruction in advance so that the resin material will flow into the cylinder when the material supply valve is opened. After that, the operation contents will be explained according to the flow of the flowchart.

In step S161, the nozzle valve is opened so that the resin material flowing out of the nozzle is discharged downward (mold).

In step S162, the delay time waits for elapse. The delay time may be the operating time of the nozzle valve plus a margin, and is assumed to operate at, for example, 100 ms.

In step S163, the injection motor 20 is driven, the plunger 25 is lowered to the lowered position, and the resin inside the injection cylinder 1 is injected into the mold via the nozzle portion.

In step S164, it waits for the holding pressure time to elapse. After the holding pressure time has elapsed, the nozzle valve is closed in step S165.

In step S166, the delay time waits for elapse. The delay time may be the operating time of the nozzle valve plus a margin, and is assumed to operate at, for example, 100 ms. Further, the mold clamping operation unit may start the mold opening operation at this point.

In step S167, the material supply valve is opened to allow the resin material to flow into the injection cylinder 1.

In step S168, the delay time elapses. The delay time may be the operating time of the nozzle valve plus a margin, and is assumed to operate at, for example, 100 ms.

In step S169, the injection motor 20 is driven to raise the plunger 25 to the supply position. Here, the supply position is a position where the injection amount / plunger diameter is increased from the descending position.

In step S170, the process waits for the supply stop delay time to elapse. The supply stop delay time may be the time from when the rise of the plunger 25 is stopped until the material is completely spread in the cylinder. For example, it is assumed that it operates at 200 ms.

In step S171, the material supply valve is closed.

The above is the operation of one cycle. If molding is to be continued, it may be carried out from step S121 after molding.

<Control method of material supply amount (automatic operation secondary supply operation)>
(Third Embodiment)
FIG. 16 is a flowchart showing another example of the injection operation to the injection unit and the cylinder. Unlike the first embodiment, a cylinder and a motor for operating the cylinder are installed in the material supply unit. By performing filling in two steps, even if the injection pressure of the resin material of the external material feeder is not stable, the supply pressure of the resin material to the cylinder can be kept constant, so the injection cylinder The injection amount of 1 can be stabilized.

The pressure Pd for pushing the material supply of the external supply device to the material supply cylinder is Pd <Po, which is smaller than the required pressure Po for opening the check valve. If an external material supply device with Pd ≥ Po is used, a valve that can open and close the flow path is installed between the material supply cylinder and the external material supply machine, and the material supply instruction is always issued to the external material supply machine. It may be placed and the injection and stop of the resin material may be controlled by the opening / closing instruction of the valve.

The additional mechanism of this embodiment will be described. A material supply cylinder and a material supply plunger are provided at the rear of the mixer holder 33. The material supply plunger is connected to the material supply motor, and the plunger can move back and forth. The material supply cylinder has a material supply port connected to an external material supply machine and a material supply valve that opens and closes the material supply port. When the material supply instruction is issued to the external material supply machine and the material supply valve is opened, the resin material flows into the material supply cylinder. The material supply valve may be one using compressed air or an electric one.

Hereinafter, a method of controlling material supply will be described along the flow of FIG.

In step S181, the injection motor 20 is driven, the plunger 25 is lowered to the lowered position, and the resin inside the injection cylinder 1 is injected via the nozzle portion.

In step S182, the position of the plunger 25 is maintained and the holding pressure time elapses. This holding time can be freely set by the user. If the resin material drips from the open nozzle 4 when the mold is opened, the injection motor 20 may be slightly raised after the holding pressure time has elapsed to lower the resin pressure inside the nozzle, so-called suckback.

In step S183, the mold clamping portion waits for the mold opening operation. It is not necessary to wait until the mold opening operation is completely opened, and it is sufficient that there is a gap between the cassette type fixed side template 10 and the open nozzle 4.

In step S184, the material supply motor is advanced and the material supply cylinder is advanced. At this time, the force with which the material supply cylinder pushes the resin material is higher than the pressure for opening and closing the check valve of the material supply port 23. Torque control is desirable as the control method for the material supply motor, but other control methods may be used as long as the relative pressure relationship as described above is satisfied.

In step S184, the material supply motor is advanced and the material supply cylinder is advanced. At this time, the pressure Pm at which the material supply cylinder pushes the resin material is higher than the required pressure Po for opening the check valve (first on-off valve 32) of the material supply port 23 and lower than the nozzle injection required pressure Pn. That is, Pn> Pm> Po.

In step S185, the injection motor 20 is driven, and the plunger 25 is stopped at a position raised by the valve closing amount from the supply position. Here, the supply position is a position where the injection amount / plunger diameter is increased from the descending position. The valve closing amount will be described in S188. At this point, the inside of the injection cylinder 1 is filled with a resin material.

In step S186, the supply stop delay time waits for elapse. This timer is the time from when the plunger 25 stops rising until the resin material sent from the material supply unit is filled in the injection cylinder 1. It is necessary to change the set value for this time depending on the type of resin material, and the operator may be able to freely set the timer value. Further, the timer value may be automatically determined by the resin material instructed by the operator.

In step S187, the injection motor 20 is stopped and the plunger 25 is raised to the supply position.

In step S188, it waits for the material supply cylinder to stop. The injection motor 20 is driven, and the plunger 25 is lowered by the valve closing amount. At this time, the cylinder internal pressure Pi is lower than the nozzle injection required pressure Pn and higher than the check valve closing required pressure Tc, that is, Pn> Pi> Pc holds. The internal pressure is adjusted by the valve closing amount. This value may be freely adjusted by the operator. Further, the internal pressure detecting means of the injection cylinder may be installed and dynamically determined while monitoring the internal pressure.

In step S188, a material supply instruction is issued to the external material supply machine. If a valve is installed between the material supply cylinder and the external material supply machine, open the valve.

In step S189, the material supply plunger retreat delay time waits for elapse. This timer is the time until the resin material is filled in the material supply cylinder. If a valve is installed between the material supply cylinder and the external material supply machine, its operating time is also included.

In step S190, the material supply motor is operated to move the material supply cylinder to the retracted position.

In step S191, it waits for the supply stop delay time to elapse. This timer is the time until the resin material is filled in the material supply cylinder.

In step S188, a material supply stop instruction is issued to the external material supply machine. If a valve is installed between the material supply cylinder and the external material supply machine, close the valve.

The injection molding machine and its control method according to the present invention are not limited to the embodiments described above, and various modifications can be made without departing from the technical idea of the present invention.

1. Injection cylinder 2. Band heater 3. Fixed platen 4. Open nozzle 5. Shut-off nozzle 6. Fixed side template holder 7. Cassette type movable side template 8. Cassette type receiving plate 9. Movable side template holder 10. Cassette type fixed side template 11. Cassette type return pin 12. Cassette type ejector pin 13. Cassette type ejector plate 14. O ring 15. Valve claw 16. Nozzle plate 17. Injection ball screw 18. Toggle link mechanism top 19 Under the toggle link mechanism 20. Injection motor 21. Injection belt 22. Injection ball screw 23. Material supply port 24. Tie bar 25. Plunger 26. Plunger head 27. Resin hole guide ring 28. First on-off valve 29. Spring 30. Mixer 31. Check holder 32. Second on-off valve 33. Mixer holder 34. Guide post 35. Plunger guide plate 36. Nozzle resin outlet 37. Insulation plate 38. Locating ring 39. Injection cylinder holder 40. Cylinder cassette 41. Base plate 42. Molding ball screw 43. Molding motor 44. Before ball screw support 45. Driven pulley 46. Drive pulley 47. Cylinder back plate 48. Plunger holder 49. Nozzle touch spring 50. Link cam follower 51. Nut holder 52. Injection bearing 53. Main Frame 54. Electrical BOX
55. Caster 56. Anchor L angle 57. Level pad 58. Link shaft 59. Link shaft long 60. Nozzle resin flow path 61. Cylinder resin flow path 62. Confluence passage 63. Branch point 64. Bush 65. Seal 66. Holder Feet 67. Injection sensor flag 68. Injection sensor mounting plate 69. Dispenser 70. Nozzle sash 71. Nozzle wedge block 72. Replacement outlet 73. Cartridge joint 74. Retain nut

Claims (6)

An injection cylinder which the liquid resin was kicked melt injection all rather setting of the resin feed section,
A nozzle provided at the tip of the flow path provided inside the injection cylinder and
Provided inside before Symbol injection cylinder, a plunger having a pressing portion at the tip,
Driving means for injection before Symbol nozzle by moving the plunger,
A first shut-off valve was provided, et al in the injection cylinder,
A second on-off valve for supplying resin from the resin supply unit to the injection cylinder is provided.
A first space between the injection cylinder and the plunger on the nozzle side of the first on-off valve,
It has a second space between the injection cylinder and the plunger on the resin supply unit side of the first on-off valve.
By moving the plunger closer to the nozzle, the resin filled in the first space is ejected from the nozzle, and at the same time, the resin is supplied through the second on-off valve by utilizing the pressure difference of the resin. The resin is supplied from the part to the second space,
By moving the plunger away from the nozzle, and characterized by utilizing a pressure difference of the resin through the first shut-off valve for supplying the resin into the first space from the second space Injection molding machine. Fitted to the flow path inner diameter of the front Symbol injection cylinder, and has a ring-shaped member provided with a plurality of flow through holes in the outer periphery of the pressing portion,
The first on-off valve, an injection molding machine according to claim 1, characterized in that opening and closing the plurality of flow through holes in the pressure difference between the resin before and after the first shut-off valve in the flow path. The injection molding machine according to claim 1 or 2, wherein the first on-off valve is urged by a spring along the flow direction of the resin. The movement of the plunger is based on the inner diameter of the bush provided on the upper end side of the inner wall of the injection cylinder.
The injection molding machine according to any one of claims 1 to 3, wherein the injection molding machine is guided by the outer diameters of a plurality of flow path holes provided on the outer periphery of the pressing portion. Prior Symbol second shut-off valve, according to a spinning spindle shape, a supply path is provided to be finely moved in the direction of flow, characterized in that open and close at a pressure difference of the resin before and after in the feed path The injection molding machine according to any one of Items 1 to 4. A cylinder holder for holding the injection cylinder is provided.
The direction in which the injection cylinder is detached from the cylinder holder and the direction in which the supply path is provided for the injection cylinder are the same.
The injection molding machine according to claim 5, wherein the injection cylinder can be removed from the cylinder holder by tilting the injection cylinder toward the supply path side.

Images