JPH074905Y2 - Mold clamping device such as injection molding machine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold clamping device such as an injection molding machine, and more particularly to a support sheet for supporting a movable platen.

[0002]

2. Description of the Related Art Conventionally, a mold clamping device such as an injection molding machine has a fixed plate fixedly mounted on a machine base for mounting a fixed mold, and a movable plate for mounting a movable mold. This movable plate is
By being guided through a plurality of tie bars, the fixed platen is moved back and forth on the machine base to perform the mold opening / closing operation.

By installing a support sheet, a sliding member, a rolling element, etc. between the movable platen and the machine base, a part of the weight of the movable platen is supported on the machine frame through the support sheet, etc. The bending of the tie bar due to the weight of the movable platen is prevented, the accuracy of the parallelism between the movable platen and the fixed plate in the mold clamping device is improved, and the mechanical life is maintained. Known mold clamping devices such as an injection molding machine having such a structure are shown in Japanese Utility Model Publication No. 63-37225 and shown in FIG.

In FIG. 2, reference numeral 1 is a base of the injection molding machine,
A fixed platen 2 and an end plate 3 are fixedly mounted on the machine base 1 with a required space therebetween. Four tie bars 4 are provided on each of the corners of the fixed platen 2 and the end plate 3 so as to bridge them. A movable plate 5 is fitted in the middle of the tie bar 4, and the movable plate 5 is adapted to move back and forth with respect to the fixed plate 2. A fixed mold 2A is fixed to the fixed platen 2, and a movable mold 5A is fixed to the movable platen 5. A mold clamping cylinder 6 is attached to the end plate 3 and moves the movable platen 5 back and forth to open and close the fixed mold 2A and the movable mold 5A and to mold the mold.

Reference numeral 7 is a support sheet made of a strip-shaped thin steel plate whose surface is finished. The support sheet 7 is provided on the machine base 1 over the range of movement of the movable platen 5, and is a tightening tool 8 composed of bolts with both ends pulled. , 9 are fixed respectively. A part of the weight of the movable plate 5 is supported on the support sheet 7,
The bottom surface of the slides to move.

[0006]

However, in a conventional mold clamping device such as an injection molding machine, when the movable plate 5 is used for a long period of time, the movable platen 5 slides against the support sheet 7 due to resistance. The support sheet 7 may be stretched and loosened. Therefore, the sliding resistance of the movable plate 5 with respect to the support sheet 7 becomes large, and it is difficult to move smoothly.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to reduce the sliding resistance of the movable plate and to allow the movable plate to smoothly slide on the supporting sheet. An object of the present invention is to provide a mold clamping device such as an injection molding machine.

[0008]

According to the present invention, a fixed plate is fixedly mounted on a machine base, and both ends of a support sheet at positions separated from the fixed plate are fixed and fixed on the machine base with a fastener. In a mold clamping device such as an injection molding machine in which the lower part of the movable plate, which is opposed to and placed against the plate, is movably supported on the support sheet It is characterized in that it is provided with a board and a tension member which is provided so as to bridge the seat portion and whose length can be adjusted.

[0009]

In the present invention, when the support sheet is loosened, the seat portion of the support sheet is displaced toward the fixed platen by tightening the tension member. Therefore, the support sheet stretches,
The slack of the support sheet is extended and returns to flat. Therefore, the sliding resistance of the movable plate on the support sheet is reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. In the present embodiment, only components different from the conventional example will be described, and the same components as the conventional example will be denoted by the same reference numerals and the description thereof will be omitted. As shown in the figure, a recess 1A is formed in the machine base 1 close to the fixed platen 2. Reference numeral 21 denotes a support sheet, which is made of a strip-shaped thin steel plate whose surface has been finished. It is fastened and installed on the machine base 1. The outermost end of the support sheet 21 on the stationary platen 2 side projects above the recess 1A, and a seat portion 24 is fixed to the upper surface of the outermost end by a bolt 23.
Further, a through hole is formed in the seat portion 24 in the horizontal direction.

A tension member 25 made of a bolt is screwed to the fixed plate 2 through a through hole of the seat portion 24, and a head portion 25A of the tension member 25 has a movable plate 5 of the seat portion 24.
Abuts the side surface. That is, the tension member 25 is provided so as to bridge the fixed platen 2 and the seat portion 24, and the length thereof can be adjusted to pull the support sheet 21 toward the fixed platen 2 side.

If the support sheet 21 is loosened while the mold clamping device such as the injection molding machine is used, loosen the clamp 9 near the fixed platen 2. Therefore, the tension member 25 is tightened deeply to the fixed platen 2 to shorten the length from the head portion 25A to the wall surface of the fixed platen 2. As a result, the seat portion 24 of the support sheet 21 is pushed toward the fixed platen 2 and displaced, and as a result, the support sheet 21 extends and the slack of the support sheet 21 extends, and the support sheet 21 returns to a flat state. After the support sheet 21 is stretched, the tension state of the support sheet 21 is maintained by tightening the loosened fastener 9.

According to the above construction, the support sheet 21
When the slack occurs, by tightening the tension member 25, the seat portion 24 of the support sheet 21 is displaced to the fixed platen 2 side, and the support sheet 21 extends and can be returned to the flat state.
Therefore, the sliding resistance of the movable platen 5 is reduced, and the movable platen 5 can be smoothly slid on the support sheet 21. In this embodiment, the tension member 25 is composed of a bolt, and the head portion 25A presses the seat portion 24 so that the seat portion 24 can be pulled toward the fixed platen 2. However, the tension member is not limited to this, and for example, a turnbuckle whose length can be adjusted may be provided so as to bridge between the fixed platen 2 and the seat portion 24.

[0014]

As described above, according to the present invention,
When the support sheet is loosened, the tension member is tightened, so that the support sheet can be easily stretched and returned to a flat state. Therefore, the sliding resistance with respect to the support sheet when the movable platen is moved is reduced, and the movable platen can be smoothly slid on the support sheet.

[Brief description of drawings]

FIG. 1 is a side view of a mold clamping device such as an injection molding machine according to an embodiment of the present invention.

FIG. 2 is a side view of a mold clamping device such as a conventional injection molding machine.

[Explanation of symbols]

 1 Machine stand 2 Fixed plate 5 Movable plate 8, 9 Tightening tool 24 Seat part 25 Tension member

Claims (1)

[Scope of utility model registration request] 1. A fixed plate is fixedly mounted on the machine base, and both ends of a supporting sheet at a position separated from the fixed plate are fixedly fixed on the machine base with a fastening tool and faced and arranged with respect to the fixed plate. In a mold clamping device such as an injection molding machine in which a lower part of a movable platen is movably supported on a support sheet, a seat portion provided at an end of the support sheet on the fixed plate side and a bridge portion provided between the fixed plate and the seat portion A mold clamping device such as an injection molding machine, which is provided with a pulling member whose length is adjustable.