JP3047186B2 - Vertical injection molding machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vertical injection molding machine, and more particularly to an improvement in a vertical injection molding machine in which an injection device is provided below a mold clamping device.

(Prior Art) Conventionally, an injection molding machine including a vertical mold clamping device in which a lower mold is fixed and a horizontal injection device in which an extension at an end of an injection portion has an L-shaped structure is very common. It is rare and only found on very small machines. In such a small-sized machine, since the amount of resin purge is small, there is no particular purging, and the purging is performed by receiving with a simple purging receiver held by hand or by injecting into a mold. In addition, since the maintenance of the screw and the like is small, it can be easily performed from the side even if there are many disassembled parts.

(Problems to be Solved by the Invention) However, according to the above-mentioned conventional small injection molding machine, although the purge amount is small, the purge can be received even when the injection is performed upward, but the purge amount is large in the large injection molding machine. Because of the large number, it becomes difficult to receive the purge, and the injection unit itself is covered with resin. Also, when replacing screws, the screws themselves are heavy in large machines, so a large space for hanging them with a crane is required, and after retreating backwards like a conventional horizontal injection unit, the screws must be horizontally moved horizontally. If the screw is pulled out obliquely in the front direction by swinging, this type of vertical machine needs to retreat greatly, and further requires a large wasteful floor area that is not used except for maintenance. Furthermore, the size becomes large and the number of steps required for disassembly at the time of maintenance increases, which becomes very difficult. Further, since the L-shaped extension is used, there is a problem that the lower mold and the nozzle are separated from each other due to the pressure at the time of injection, and the resin leaks.

The present invention is directed to a vertical injection molding machine, focusing on the above-mentioned conventional problems, and an object of the present invention is particularly to improve a vertical injection molding machine in which an injection device is provided below a mold clamping device.

(Means for Solving the Problems) In order to achieve the above object, a first invention according to the present invention is directed to a vertical mold clamping device such as a press for opening and closing a die in a vertical direction, and a vertical mold clamping device. In a vertical injection molding device having a horizontal injection device that is disposed below a die plate and supplies molten resin between dies, a table that slides horizontally below a mold clamping device, and a table that is horizontally moved It consists of a traction device for sliding, a rocking table supported at one end by the table, the other end supported by the table via the actuator, and swingable by operation of the actuator, and an injection device fixed to the rocking table. .
In the second invention, a resin receiving device for resin purging is disposed on the front operation side. According to the third aspect of the present invention, a configuration is adopted in which a cylinder that carries an L-shaped extension at the tip of the horizontal injection device is provided. In the fourth invention, the position of the connecting pin between the horizontally slidable table and the swing table that is swingable by the operation of the actuator is arranged at substantially the same height as the contact surface between the lower mold and the tip of the extension. I have.

(Operation) According to the above configuration, the injection section of the injection molding apparatus is disposed below the die plate and is slid in the horizontal direction to contact the resin receiving apparatus. box office. Further, since this resin receiving device is disposed on the front operation side, it can be easily determined by one person whether or not the purging has been completed. Since the injection device is taken out to the front operation side outside the die plate of the vertical mold clamping device by the traction device, maintenance such as screw replacement and nozzle inspection becomes easy, and the floor area is reduced. Since the L-shaped extension is supported by the cylinder, the lower mold and the nozzle are not separated at the time of injection, and can be safely replaced at the time of screw replacement. In addition, since the position of the connection pin is disposed at substantially the same height as the contact surface between the lower mold and the tip of the extension, the tip of the extension abuts the lower mold at a substantially right angle and no resin leaks.

(Example) Hereinafter, an example of a vertical injection molding machine according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of the overall configuration of one embodiment of the present invention, and FIG. 2 is a plan view of FIG. 3 and 4 are a partially detailed diagram and an operation diagram of one embodiment. FIG. 5 is a partially enlarged view at the time of purging in one embodiment. FIG. 6 is a view for explaining attachment and detachment of the extension. FIG. 7 is a conceptual diagram when the injection unit of the conventional injection molding machine is replaced. 1 and 2, a vertical mold clamping device such as a press for opening and closing a mold in a vertical direction.
In a vertical injection molding apparatus 1 having a horizontal injection device 30 disposed below a die plate of the vertical mold clamping device 10 and supplying a molten resin between the dies, the vertical injection molding device 1 has a horizontal position below the mold clamping device. Table 60 that slides in the direction, a traction device 80 that slides the table in the horizontal direction, one end is supported by the table, the other end is supported by the table via the actuator 70, and is swingable by the operation of the actuator 70. It comprises a swing table 90, a horizontal injection device 30 fixed to the swing table, and a hydraulic unit 110. The vertical mold clamping device 10 has four lift guide rods 12
A lift frame 14 supported by the lift guide rod 12 and moving in the vertical direction; an upper die plate 18 held by four compression cylinders 16 fixed to the lift frame 14; The upper mold 20 and the lower mold arranged opposite to the upper mold 20
22 and the lower mold 22 are held, and the lift guide rod 12
The mold is opened and closed in an up-down direction by an actuator (not shown) or a crank or the like, which comprises a die plate 24 or the like for supporting the die. The horizontal injection device 30 includes an injection unit 32, an extension 34 that is bent into an L-shape at the tip of the injection unit 32, injects resin upward, and contacts the lower mold 22, and an injection that drives the injection unit 32. A driving device 36, a bed 38 supporting the injection unit 32 and the injection driving device 36, and the like.
It is fixed at 90. A bracket 94 is fixed to one end of the plate 92 on the rocking table 90, and the bracket 94 is connected to the table 60 via a pin 96. The height (H) of the position of the pin 96 is substantially the same as the contact surface between the lower mold 22 and the tip of the extension 34. Further, the other end of the plate 92 is connected to an actuator 70 supported by the base 60 via a pin 98. The plate 62 of the table 60 is supported by a linear bearing 64 laid on the ground, a bracket 66 supporting the rocking table 90 at one end, and a cylinder 68 and a rocking table supporting the L-shaped extension 34 at the other end. An actuator 70 that swings 90 is provided. The plate 62 is provided with a block 72 for holding the rocking table 90 when it is lowered. Further, the plate 62 is provided with a block 84 fixedly connected to one end of the traction actuator 82 of the traction device 80 for sliding the table 60 in the horizontal direction. The other end of the traction actuator 82 of the traction device 80 is the frame base of the vertical mold clamping device 10.
Connected to 12. The traction actuator 82 is provided with a sensor 84 for detecting the amount of horizontal sliding movement of the base 60, and the amount of movement is controlled by a flow control valve or the like (not shown). The hydraulic unit 110 is disposed above the horizontal injection device 30 and includes a tank (not shown), a pump, a flow control valve, a pressure regulating valve, and the like, and is connected to the injection drive device 36 or each actuator, a cylinder, or the like via a flexible hose or the like. Supplying pressurized oil. The resin purge resin receiving device 100 is disposed on the front operation side (A) on the lower surface of the die plate 24 at a position in the horizontal sliding direction of the horizontal injection device 30.

 Next, the operation of the above configuration will be described.

When it is desired to purge the resin for molding the next molded article, the hydraulic pressure of the actuator 70 is lowered by operating a switching valve (not shown) until the rocking table 90 contacts the block 72.
Next, pressure oil is sent from a pump (not shown) to the traction actuator 82, and the table 60 is slid in the horizontal direction and moved to a position of the resin receiving device 100 for resin purging by a predetermined amount. This movement amount may be initially set, or may be controlled by a microcomputer or the like by instructing the movement amount from outside. After moving by a predetermined amount, pressure oil is sent to the actuator 70, and the rocking table 90 is raised until the tip of the extension 34 comes into contact with the resin receiving device 100 for resin purging. When the contact is made, the ascent is stopped, the pressurized oil is sent to the injection driving device 36, and the injection unit 32 is purged. At this time, the purged resin flows down below the purged resin receiving device 100 or accumulates in the resin receiver. By seeing the resin from the front operation side, it is possible to determine whether or not the purging of the resin has been completed, so that the purging can be easily performed by one person. When the injection nozzle and screw of the injection device 30 are to be replaced or inspected, the rocking table 90 is lowered in the same manner as when purging the resin, and then the traction actuator 82 is operated, and at least the extension 34 is moved to the vertical clamping device. Of the die plate 24 to the position where it comes to the front operation side.
Tow 60. At the position outside this die plate 24, in a large space, use a crane or the like to replace screws,
Perform maintenance such as nozzle inspection. At this time, the attachment and detachment of the extension 34 is facilitated by supporting the cylinder 68 against the extension 34.

When purging is required to mold the resin, the pressure oil of the actuator 70 is drained, and the rocking table 90 is lowered until the rocking table 90 contacts the block 72. Next, the traction actuator 82 is operated to retreat the base 60 to a predetermined position where the tip of the L-shaped extension 34 contacts the lower mold 22. At this position, pressure oil is sent to the actuator 70, and the rocking table 90 is raised to bring the tip of the L-shaped extension 34 into contact with the lower mold 22.
Further, the cylinder 68 is extended to support the L-shaped extension 34. As a result, the lower mold and the nozzle are not separated at the time of injection, and leakage of the resin is eliminated. Also, since the height of the position of the pin 96 and the height of the contact surface of the tip of the lower mold 22 and the extension 34 are substantially the same, the tip of the extension 34 is
The resin comes into contact with the lower surface at a right angle, so that the resin does not leak. When performing maintenance such as inspection of the injection driving device 36, the injection driving device 36 further retracts the base 60 to the outside of the hydraulic unit 110.

(Effects of the Invention) As described above, according to the present invention, the injection section of the injection molding apparatus is brought into contact with the resin receiving apparatus, so that resin can be purged in the resin receiving apparatus and the resin receiving apparatus can be moved to the front operation side. The end of the purge can be easily determined by one person. Further, since the injection device is taken out of the die plate of the vertical mold clamping device by the traction device, maintenance such as replacement of screws and inspection of nozzles becomes easy, and the floor area can be reduced. Since the L-shaped extension is supported by the cylinder, the lower mold and the nozzle do not separate during injection, and the position of the connecting pin is almost the same height as the contact surface between the lower mold and the tip of the extension. , The tip of the extension abuts the lower mold almost at right angles, so that no resin leaks. An excellent effect that a jig such as a crane can be used in a wide space even at the time of screw replacement can be obtained, which allows safe operation.

[Brief description of the drawings]

FIG. 1 is a side view of the entire structure of one embodiment of the present invention. FIG. 2 is a plan view of FIG. 1. FIG. 3 is a partially detailed view of one embodiment. FIG. 4 is an operation diagram of FIG. FIG. 6 is a partially enlarged view at the time of purging in one embodiment. FIG. 6 is a view for explaining attachment / detachment of an extension. FIG. 7 is a conceptual view when an injection unit of a conventional injection molding machine is replaced. Device 10 Vertical clamping device 22 Lower mold 30 Horizontal injection device 34 Extension 60 Base 68 Cylinder 70 Actuator 80 Traction device 90 Rocking table 96 Pin 100: Resin receiving device for resin purge 110: Hydraulic unit

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 45/00-45/84

Claims (3)

(57) [Claims] 1. A vertical mold clamping device such as a press for opening and closing a mold in a vertical direction, and a horizontal injection device disposed below a die plate of the vertical mold clamping device and supplying molten resin between the molds. A vertical slide molding device having a table that slides horizontally below the mold clamping device, a traction device that slides the table horizontally, and a table supported at one end by the table and the other end via an actuator. A swing table supported by the actuator and swingable by the operation of the actuator, an injection device fixed to the swing table, and a resin receiving device for resin purge disposed on the front operation side; a traction device and an actuator Characterized in that the nozzle of the injection device can be brought into contact with the resin receiving device by the operation of (1). 2. The vertical injection molding machine according to claim 1, further comprising a cylinder for holding an L-shaped extension at the tip of the horizontal injection device. 3. A rocking center pin of the rocking table that connects the rocking table to the rocking table is provided at the rear end of the horizontal injection device, and the height of the pin is set at the contact surface between the lower mold and the tip of the extension. 2. The vertical injection molding machine according to claim 1, wherein the height is substantially the same as that of the vertical injection molding machine.