JP2510471B2 - Mold clamping device for synthetic resin molding machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold clamping device used in a synthetic resin molding machine such as an injection molding machine, an injection compression molding machine and a blow molding machine.

[0002]

2. Description of the Related Art Generally, in a resin molding machine such as an injection molding machine, a mold clamping device is provided with a movable plate movable forward and backward with respect to a fixed plate fixed on a bed of the machine. Is moved by a hydraulic cylinder device directly or via a toggle mechanism to open and close the mold and close the mold.

[0003]

The mold opening and closing and the mold clamping in the mold clamping device described above are performed because the movable plates move to the fixed plate side and the pair of molds attached to the respective plates are closed. The position will deviate from the center line between the opened molds. In a normal injection molding machine, the nozzle for injecting the molten resin is on the side of the fixed plate, and JIS 51
When using a mold structure such as injection molds A and B shown in 06 in which molten resin is injected and filled in the cavity from the outer surface of the fixed side mounting plate through the mounting plate and the fixed side mold plate. Such movement of the central axis does not pose any problem. However, in special cases such as insert molding, the part surface of the fixed side mold plate of the mold and the movable side mold plate,
That is, it may be necessary to perform injection filling from the side surface of the mold, and in blow molding, the mold must be opened evenly to the left and right with respect to the extrusion nozzle of the molten resin. In such a case, there is a problem in that the conventional mold opening / closing and mold clamping mechanism that moves to the fixed side cannot be used.

The present invention has been conceived in order to solve the above problems, and enables a mold mounting plate to be opened and closed in both directions around a nozzle of a molding machine with a relatively simple mechanism. Further, the present invention provides a mold clamping device equipped with a mold lifting mechanism so that the mold slides upward during mold clamping and the sprue port comes into close contact with the nozzle of the molding machine.

[0005]

To achieve the above object, the present invention is directed to a resin molding machine in which an injection nozzle is provided in a direction perpendicular to the opening / closing direction of a mold, and the molding machine faces the bed. Several parallel tie bars are slidably inserted in the required places of the fixed board, movable board and sliding board placed, and both ends of the tie bars are inserted and held in the pressure receiving support board fixed to the bed, and further fixed. Both ends of the connecting rod slidably inserted into the board are fixed to the movable board and the sliding board, and bearings are projected on the opposing surfaces of the fixed board and the sliding board, and both ends of the toggle mechanism via the hydraulic cylinder. Is a mold clamping device having a structure in which the bearing is pivotally supported on the bearing, and further, guide rails having locking edges are fixed to the facing surfaces of the fixed platen and the movable platen and slidably engaged with the locking edges. Insert a mold with a step on the side from above the bed and It is held by the pedestal 11, and the mold is slid up by the mold lifting arm (or table) when the mold is clamped so that the sprue mouth of the mold comes into strong contact with the nozzle of the molding machine. It adopts a structure that lowers it.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a mold clamping device according to the present invention will be described with reference to the drawings. A movable plate 3 for mounting a mold and a mold, which are sequentially mounted slidably in the longitudinal direction on a bed 1 of the apparatus.
Two parallel tie bars 5 are slidably inserted above the mounting fixed plate 2 and the sliding plate 4, and both ends of the tie bars are fixedly supported and supported by pressure receiving support plates 6 and 7, respectively. There is. Further, the two parallel connecting rods 8 below the fixed platen 2, the movable platen 3, and the sliding platen 4 are slidable with respect to the fixed platen 2,
Moreover, the movable platen 3 and the sliding platen 4 are fixed at both ends thereof 8a, 8b.
Have been. Further, the stationary platen 2 and the sliding platen 4 are connected to each other by a toggle mechanism 9 in which bearings 2a and 4a are provided on their opposing surfaces so as to project from each other and a hydraulic cylinder C drives them.

As shown in FIG. 3, engaging edges 10a and 1 are provided on the facing surfaces of the fixed plate for mounting the mold and the movable plate for mounting the mold , respectively.
A pair of guide rails 10 and 10 having 0a are mounted vertically, and a mold receiving base 11 is mounted below the guide rails 10 so as to be adjustable at a position according to the size of the mold (FIG. 4). . The below the mold cradle 11, the mold elevating sliding arm 11a forming the <br/> inclined surface rising towards the base, 11a are protruded from the tip. 1 and 2 as another embodiment
The one shown is applicable to the fixed plate for mold attachment and mold attachment described above.
Mold 2 through guardrails 10 and 10 mounted on the moving platen
Fixed plate for die attachment and movable plate for die attachment
When the mold is clamped by the
Contact, immediately below the so-called parting surface, its top
Bet the die slide lift 12 with a mountain cross section so that it is positioned.
It is attached to the do .

On the other hand, a step 20a or a groove 20b is formed on each side surface of the pair of molds 20 which are fixed and movable. This mold is the guide rail 10,
From above 10 to the engaging edges 10a, 10a into the grooves 20b, 20
b is engaged and lowered, and the lower surface of the die is supported by the die stand 11.

[0009]

The mold 20 thus mounted on the fixed platen 2 and the movable platen 3 operates as follows. First, when the cylinder rod is extended by the hydraulic cylinder C, FIG.
As shown in FIG. 1, the toggle 9 which is bent in a V shape is extended in a straight line as shown in FIG. 1, and the stationary platen 2 and the sliding platen 4 move in the direction of separating from each other. The movable platen 3 connected by the rod 8 is pulled by the sliding platen 4 and approaches the fixed platen 2 side at a constant speed, and the mold is clamped at the center position of the movable platen 3 and the fixed platen 2. At the stage of this mold clamping, the molds are guided by the inclined surfaces 11b of the mold sliding elevating arms 11a (or the mold sliding elevating table 12) which are provided so that the lower surfaces of the respective molds are opposed to each other. Ascending along the rail 10a, the sprue port 21 on the upper surface of the mold touches the injection nozzle N at the final stage of mold clamping. In this state, the molten resin is filled in the cavity 23 from the nozzle N through the sprue 22. Next, when the hydraulic cylinder C sucks the cylinder rod and pulls the toggle 9, the toggle bends into a V shape, and the fixed plate 2 and the sliding plate 4 approach each other. Then, the movable platen 3 connected to the sliding platen 4 moves in the direction opposite to the fixed platen 2 around the nozzle, and the mold is opened. By the time the mold opening is completed, the mold sliding on the elevating arm 11a descends by its own weight and separates from the nozzle N. Such a series of cycles is repeated thereafter to perform molding.

Due to the above structure, the mold clamping mold opening is performed at a constant speed and at equal intervals around the resin injection nozzle, and the mold and the nozzle are touched with a strong pressure.

[0011]

As described above, according to the present invention, a plurality of tie bars 5 and 5 are slidably inserted through the fixed platen 2, the movable platen 3 and the sliding platen 4 which are erected on the bed 1, and the tie bar 5 is provided. Both ends of 5 are fixed by support plates 6 and 6, respectively, and the fixed plate 2 and the sliding plate 4 are connected by a toggle 9 via a hydraulic cylinder 7, and the sliding plate 4 and the movable plate 3 are connected by a rod 8. Since the hydraulic cylinder 7 is actuated, the mold is opened and closed at equal speeds to the left and right around the nozzle for injecting the molten resin at a constant speed. The mold clamping speed is doubled compared with the mold clamping device in which only the chisel moves, and the work efficiency is improved.

In particular, the present invention can be applied to a vertically clamped injection molding machine or blow molding machine corresponding to an insert for injecting and filling a molten resin from a parting surface of a mold to improve work efficiency.

The die mounting method is a locking edge 10 for latching.
The mold cradle 1 can be formed simply by engaging and inserting a groove (or step) provided on the side surface of the mold from above in the guide rail 10 having a.
The fixed platen 2 and the movable platen 3 are mounted on the fixed platen 1 at a predetermined position, so that the mold can be mounted easily and quickly, and the mold sprue port 21 is set to the nozzle N of the molding machine by the mold lifting arm 11a when the mold is clamped. The solid touch makes it possible to prevent the resin from leaking from the contact surface between the nozzle and the sprue port.
Also, the nozzle touch mechanism that moves the cylinder of the injection molding machine back and forth is no longer necessary.

Since the toggle structure is adopted in the mold clamping mechanism, the resin filling pressure is tolerated by the mechanical strength of the toggle material itself while the toggle is extended, that is, while the mold is clamped and the molten resin is filled. Therefore, during that time, energy saving is achieved because no additional power is required for the mold clamping.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a main part of a mold clamping device according to the present invention during mold clamping.

FIG. 2 is a vertical sectional view when the mold is opened.

FIG. 3 is a plan view at the time of mold clamping.

FIG. 4 is a perspective view showing a mold attaching device.

FIG. 5 is a perspective view showing a mold guide rail.

FIG. 6 is a perspective view of a mold.

[Explanation of symbols]

 1 bed 2 fixed plate 3 movable plate 4 sliding plate 5 tie bar 6 pressure receiving support plate 7 pressure receiving support plate 8 connecting rod 9 toggle 10 guide rail 11 die receiving stand 11a die lifting arm 12 die lifting stand 20 die 20a die Mold step 20b Mold side groove

Claims (3)

(57) [Claims] 1. A injection nozzle in the direction perpendicular to the opening and closing directions of the mold are brought apparatus resin injection molding machine, a horizontal base
Several parallel tie bars are slidably inserted into the required positions of the mold mounting movable plate, the mold mounting fixed plate and the sliding plate that are sequentially placed on the pad, and both ends of the tie bars are used as beds. Both ends of a plurality of connecting rods that are fixedly inserted through the pressure receiving support plate that is fixed and that are slidably inserted through the fixed plate for mounting the mold
A type that has a structure in which it is fixed to a movable plate and a sliding plate for attachment, bearings are respectively provided on the opposing surfaces of the fixed plate for mounting the mold and the sliding plate, and the space between them is connected by a toggle mechanism driven by a hydraulic cylinder. It is a clamping device, which is a fixed plate for mold attachment and
The guide rail, on which the mold is slidably mounted vertically on the movable plate for mounting the mold, and the fixed plate for mounting the mold and the mold can be mounted.
It is characterized in that it has an elevating device for slidingly moving a mold inserted between the movable platen up and down with opening and closing motions.
Mold clamping device having. 2. A mold lifting device, the mounted below the pair of guide rails mounted vertically on the opposite surface of the die mounting the fixed platen and the mold mounting movable platen mold pedestal, from the tip Towards the base
Projecting the sliding arm for mold lifting having an inclined surface selfish increase
The mold clamping device according to claim 1, wherein the mold clamping device is formed by 3. A mold lifting device, the pair of guide rails of the lower bed mounted perpendicularly to the opposing faces of the mold mounting the fixed platen and the mold mounting movable platen, sectional mountain shape of the mold slide The mold clamping device according to claim 1, wherein the movable lifting / lowering table is mounted in a protruding manner.