JPH07106590B2 - Tie bar fastening device in compound mold clamping device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening device for fastening a tie bar with sandwiching members in a composite mold fastening device of an injection molding machine.

[0002]

2. Description of the Related Art As a mold clamping device for an injection molding machine, a small-diameter high-speed mold opening / closing cylinder and a large-diameter low-speed mold clamping cylinder are attached to a movable plate supported by a plurality of tie bars. Opening and closing movements are performed by the mold opening and closing cylinders, and the movable platen clamping movement is performed by moving the clamp members of the same number as the above tie bars by actuators and clamping each tie bar by these clamping members to clamp the movable platen. It is known that a die clamping cylinder is used in combination with.

The above-mentioned mold clamping device is generally called a composite mold clamping device. In this device, a conventional clamping device for clamping a tie bar with a sandwiching member has a structure shown in FIG. That is, the movable platen 6 is slidably supported by the four tie bars 5 which are moved by a mold clamping cylinder (not shown). In each tie bar 5 part of the movable plate 6,
A pair of sandwiching members 11 and 12 are provided respectively.
The sandwiching members 11 and 12 are provided with the tie bar 5 separated from each other,
It is movable in the left-right direction along the pair of guide members 8 and 9. The outer sandwiching member 12 has a pair of support rods 30, 3
One end of 0 is fixed, and the other end of each support rod 30 penetrates through holes 11b, 11b formed in the inner sandwiching member 11. The support rods 30, 30 support the fastening cylinder 14 via a support member 31. Fastening cylinder 1
The piston rod 14 a of No. 4 is fixed to the inner sandwiching member 11.

The pair of sandwiching members 11 and 12 approach each other by the extension operation of the fastening cylinder 14 to sandwich the tie bar 5, and are separated from each other by the contraction operation of the fastening cylinder 14 to release the fastening of the tie bar 5. The movable plate 6 is fastened to the tie bar 5 by fastening the tie bar 5 with a pair of sandwiching members 11 and 12.
Is coupled to the mold clamping cylinder via and is clamped by the mold clamping cylinder. Further, the movable plate 6 is separated from the mold clamping cylinder by releasing the fastening of the tie bar 5 by the pair of sandwiching members 11 and 12, and is moved at high speed along each tie bar 5 by a mold opening / closing cylinder (not shown).

The guide members 8 and 9 have stoppers 15 and 15a.
Is provided. The stoppers 15 and 15a prevent the sandwiching members 11 and 12 from being separated from the guide members 8 and 9, respectively.
The movable plate 6 includes detectors 17 and 18 such as limit switches.
Is provided. The detector 17 includes a pair of sandwiching members 1
1 and 12 are opened, and another detector 18
Detects that the pair of sandwiching members 11 and 12 sandwiches the tie bar 5.

[0006]

In the structure of the conventional fastening device described above, the pair of sandwiching members 11 and 12, the fastening cylinder 14, the detectors 17 and 18, and the stoppers 15 and 15a are
It is necessary to attach to each tie bar 5, and the fastening cylinder 14
There is a problem in that the structure including the piping of 1 and the wiring of the detectors 17 and 18 becomes very complicated.

It is an object of the present invention to provide a fastening device for a tie bar in a composite mold fastening device, which has a simple structure.

[0008]

In order to achieve the above object, the present invention provides a movable platen supported by a plurality of tie bars with a small diameter and high speed mold opening / closing cylinder and a large diameter and low speed mold clamping cylinder. Attached, the movable platen is normally opened and closed by the mold opening and closing cylinder, and the movable platen is clamped and moved by moving the same number of pairs of sandwiching members as the above tie bars with an actuator and sandwiching each tie bar with these sandwiching members. In a compound mold clamping device of an injection molding machine in which a board is connected to a mold clamping cylinder and the mold clamping cylinder is used, a sandwiching member inside one of the two tie bars adjacent to each other and a sandwiching member outside the other tie bar, And an outer sandwiching member of the one tie bar and an inner sandwiching member of the other tie bar are connected to each other by a connecting rod, and between the inner sandwiching members of the two tie bars, and It has a structure provided with an actuator to move in a direction aligned with their scissors member between the outer scissors members.

[0009]

According to the above construction, the sandwiching members on the outer and inner sides of the two tie bars adjacent to each other are moved by one actuator to be engaged with and disengaged from the tie bars. Therefore, the number of equipment for the fastening cylinders for two tie bars is one (2 in the past), and the number of detectors is two (4 in the past). To be done.

[0010]

1 to 3 show an embodiment of the present invention, in which reference numeral 1 is a fixed board. The stationary platen 1 is provided with four mold clamping cylinders 2 and two mold opening / closing cylinders 3 and is fixed to a frame base 4. Each of the mold clamping cylinders 2 has the same shape and has a large diameter and low speed, and has a substantially rectangular shape.
It is arranged horizontally in the corner. The mold opening / closing cylinders 3 have the same shape, have a small diameter and a high speed, and are horizontally arranged at diagonal positions of the stationary platen 1. The cylinders 2 and 3 are parallel to each other. A tie bar 5 is integrally provided on the piston rod 2a of each mold clamping cylinder 2 with its center line aligned with the center line of the piston rod 2a.

Reference numeral 6 is a movable plate. The movable plate 6 is also substantially rectangular and has sliding holes 6a at four corners facing the respective mold clamping cylinders 2. The movable plate 6 is placed on the rails 7 of the frame base 4 and slidably supported by inserting the tie bars 5 into the sliding holes 6a. Movable plate 6
A piston rod 3a of the mold opening / closing cylinder 3 is connected to the. A mold (not shown) is attached to the fixed plate 1 and the movable plate 6 as is well known.

Guide members 8 and 9 are horizontally provided at the sliding holes 6a on the surface of the movable plate 6 opposite to the fixed plate 1. Each pair of guide members 8 and 9 supports a pair of sandwiching members 11 and 12. Each sandwich member 11, 12
Is movable in the diameter direction of the tie bar 5 (left and right direction in FIG. 3). Each of the sandwiching members 11, 12 has locking portions 11a, 12a formed by forming a plurality of ring-shaped grooves on an arcuate inner surface, and the tie bars 5 are engaged by the locking portions 11a, 12a. The movable plate 6 is fixed to the tie bar 5 with the fastening portion 5a formed of a plurality of ring-shaped protrusions provided on the outer periphery of the movable plate 6 sandwiched therebetween.

The inner sandwiching member 11 has a horizontal through hole 11b. The connecting rod 13 is inserted into the through hole 11b. In FIG. 3, the left end of the upper connecting rod 13 is opened in the sandwiching member 11 inside the left tie bar 5 of the tie bars 5, 5 that are adjacent to each other in FIG. 3, and the right end is opened in the sandwiching member 12 inside the right tie bar 5. The through hole 11b is inserted to be fixed to the outer sandwiching member 12 of the right tie bar 5, and the left end of the lower connecting rod 13 is formed with the through hole 11b formed in the inner sandwiching member 11 of the left tie bar 5. It is inserted and fixed to the outer sandwiching member 12 of the left tie bar 5 and the right end to the inner sandwiching member 11 of the right tie bar 5, respectively. In this way, two pairs of sandwiching members 11, 12, 11, 12 that are adjacent to each other on the left and right
Are connected to each other by four connecting rods 13.

Clamping member 1 inside the tie bars 5 and 5
A fastening cylinder 14 having a piston rod 14a is provided between the Nos. 1 and 11. A stopper 15 is attached to the outer ends of the guide members 8 and 9. The stopper 15 prevents the outer sandwiching member 12 from separating outwardly from the guide members 8 and 9, and at the same time, the inner and outer sandwiching members 1
Ensure that both tie bars 5, 5 of 1, 12 escape from the fastening portion 5a. The stopper 15 may be provided at the inner ends of the guide members 8 and 9 to prevent the inner sandwiching member 11 from coming off.

Each tie bar 5 is provided with a stop member 16. The stop member 16 stops the movement of the movable plate 6 with respect to the tie bar 5, and causes the sandwiching members 11 and 12 to coincide with the position of the fastening portion 5 a of the tie bar 5. Further, the movable plate 6 has a detector 17 such as a limit switch for detecting the expansion / contraction operation of the fastening cylinder 14, that is, the open / closed state of the sandwiching members 11, 12.
18 is attached. An end plate 19 is fixed to the tip of the tie bar 5. The end plate 19 is slidably mounted on the rail 7. An ejector cylinder 20 is attached to the movable platen 6. The ejector cylinder 20 moves the ejector pin 21. Reference numeral 22 denotes a movable plate guide that also serves as a guide for the sandwiching members 11 and 12.

Next, the operation of the tie bar fastening device in the composite mold fastening device of the present invention constructed as described above will be described. The mold clamping is started by bringing the movable plate 6 close to the fixed plate 1 at high speed by the mold opening / closing cylinder 3 in a state where the sandwiched portions 11 and 12 are opened. At this time, the movable platen 6 slides on the tie bar 5 and the rail 7 to approach the fixed platen 1. When the movable plate 6 touches the stop member 16 as shown in FIGS. 1 and 2, the fastening cylinder 14 expands to move the inner sandwiching members 11, 11 outward and the outer sandwiching members 12, 12 inward. The locking portions 11a, 12a of the sandwiching members 11, 12 are moved by moving them, respectively.
The fastening plate 5a of the tie bar 5 is sandwiched as shown in FIG.
After the tie bar 5 is fastened, the mold clamping cylinder 2 is contracted.

The movable plate 6 has a piston rod 2 of a mold clamping cylinder 2 when the tie bar 5 is fastened by the sandwiching members 11 and 12.
Since it is coupled to a through the tie bar 5, the mold clamping cylinder 2 is contracted so that it comes closer to the fixed plate 1 and the mold is clamped with a strong force. The detector 17 detects the fastening of the tie bar 5 by the sandwiching members 11 and 12.

The mold opening is generally performed in the reverse order of the above. That is, the mold clamping cylinder 2 is extended to move the movable platen 6,
After separating the molds, the fastening cylinder 14 is contracted to move the inner sandwiching members 11, 11 inward and the outer sandwiching members 12, 12 outward, respectively.
The tie bar 5 is unfastened by 2, and the mold opening / closing cylinder 3 is extended to open and move the movable plate 6 at high speed. In addition, the fastening cylinder 14 is extended to sandwich the sandwiching members 11, 12
When the door is opened, the stopper 15 prevents the outer sandwiching member 12 from excessively moving, so that one of the sandwiching members 11 and 12 does not open too much and the other of the sandwiching members 11 and 12 does not remain with the tie bar 5 fastened. Then, the fastening portion 5a of the tie bar 5 is escaped. The detector 18 detects the opening of the sandwiching members 11 and 12.

In the above embodiment, the cylinder 14 is used as the actuator for moving the sandwiching members 11 and 12, but
The motor, screw, link, etc. can be replaced with this. Further, in the above-described embodiment, the inner sandwiching members 11, 11
The structure is such that the fastening cylinder 14 directly moves the
It is also possible to adopt a structure in which the outer sandwiching members 12, 12 are directly moved by an actuator such as a fastening cylinder 14.
Further, the compound mold clamping device, other than the embodiment shown in the figure, forms an insertion hole through which a tie bar is inserted into a piston and a piston rod of a mold clamping cylinder provided on a fixed platen or a movable platen, and is inserted into the insertion hole. There are various modifications such as one in which the movable platen is connected to the mold clamping cylinder by sandwiching the tie bar with the sandwiching member, or one in which the mold opening / closing cylinder is provided in the movable platen. It can also be implemented in a device.

[0020]

As described above, in the tie bar fastening device according to the present invention, a small-diameter high-speed mold opening / closing cylinder and a large-diameter low-speed mold clamping cylinder are attached to a movable plate supported by a plurality of tie bars. The normal opening and closing movement of the movable platen is performed by the mold opening and closing cylinders, and the mold clamping movement of the movable platen is performed by moving the same number of pairs of sandwiching members as the above tie bars with the actuator and sandwiching each tie bar with these sandwiching members. In a mold clamping device of an injection molding machine in which the mold clamping cylinder is coupled to the mold clamping cylinder, and a clamping member inside one of the two tie bars adjacent to each other and a clamping member outside the other tie bar, and The outer sandwiching member of the one tie bar and the inner sandwiching member of the other tie bar are connected to each other by a connecting rod, and between the inner sandwiching members of the two tie bars, Since it is configured such that an actuator that moves the sandwiching members in the arranging direction is provided between the sandwiching members on the outside or outside, the number of equipment such as fastening cylinders and detectors is halved compared to the conventional one, and the piping and wiring The entire structure including can be greatly simplified.

[Brief description of drawings]

FIG. 1 shows an embodiment of a tie bar fastening device according to the present invention, and is a cross-sectional view of a compound mold clamping device equipped with the tie bar fastening device.

FIG. 2 is a plan view of the same.

FIG. 3 is a cross-sectional view showing a relationship between a sandwiching member, a connecting rod, a fastening cylinder, and the like.

FIG. 4 is a schematic front view of a conventional fastening device.

[Explanation of symbols]

 2 type clamping cylinder 3 type opening / closing cylinder 5 tie bar 6 movable plate 11, 12 sandwiching member 13 connecting rod 14 fastening cylinder (actuator)

Claims (1)

[Claims] 1. A small-diameter high-speed mold opening / closing cylinder and a large-diameter low-speed mold clamping cylinder are attached to a movable plate supported by a plurality of tie bars, and the movable plate is normally opened and closed by the mold opening / closing cylinder. The mold clamping movement of the movable platen is performed by the mold clamping cylinder by connecting the movable platen to the mold clamping cylinder by moving the same number of pairs of clamping members as the above tie bars with an actuator and clamping each tie bar with these clamping members. In a compound mold clamping device of an injection molding machine, a sandwiching member inside one of the two tie bars adjacent to each other and a sandwiching member outside the tie bar, and a sandwiching member outside the one tie bar and the other tie bar. The inner sandwiching members of the two tie bars are connected to each other by connecting rods, and the sandwiching members are arranged between the inner sandwiching members of the two tie bars or between the outer sandwiching members. A fastening device for a tie bar in a compound mold clamping device, which is provided with an actuator that moves in a vertical direction.