JPH07251424A - Mold clamping mechanism - Google Patents

Abstract

PURPOSE:To provide a mold clamping mechanism which improves the safety of mold replacement work and reduces the cost. CONSTITUTION:A mold clamping mechanism consists of a fixed platen 32 fixed on one end of a bod 31, a revolving movable platen 33 mounted revovably on a shaft 40 and fixed on the other end of the bad 31 or disposed movably on the bed 31 and in parallel with the fixed platen 32, tie bar 45 and a half nut 48 for fastening the revolving movable platen 33 to the fixed platen 32 and a cylinder 50 revolvable until the revolving movable platen 33 is disposed horizontally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold clamping mechanism capable of easily exchanging a mold of a processing machine using a mold such as an injection molding machine and a press machine.

[0002]

2. Description of the Related Art FIGS. 4 to 10 show a conventional example of a mold exchanging device for a processing machine using a mold. FIG. 4 shows a horizontal injection molding machine M.
And an overall perspective view of the mold exchanging device T thereof, showing that a left and right integrated mold D is fixed by a mold clamper 4 in a mold mounting space 3 between the fixed plate 1 and the movable plate 2 of the molding machine M. It is detachably attached to the board 1 and the movable board 2. On the front side of the molding machine M, two mold receiving frames 5 incorporated in one carriage S travel in the left-right direction on a traveling rail 6 via a traveling drive device 7, and each mold receiving frame 5 is Alternatively, it can be switched to the mold replacement position X on the front side of the mold mounting space 3. Below the mold mounting space 3 of the molding machine M, a pair of conveying roller devices 8 are fixedly provided on the fixed platen 1 and the movable platen 2. The center of the mold D can be aligned. Moreover, 2 is provided on the upper surface of each mold receiving frame 5.
A set of conveying rollers 8A is attached, and the conveying rollers 8A
A pair of molds D can be placed on A.

As shown in FIGS. 4 to 10, the mold receiving frame 5
Is located at the mold exchange position X, the pair of molds D is pushed and pulled over the mold receiving frame 5 and the conveyance roller device 8 with the pushing and pulling device P.
The mold D can be carried in and out by moving the mold D back and forth. Further, each of the mold receiving frames 5 is provided with each push-pull device P. The push-pull device P has a main body 11, a drive band 12 that is driven by push and pull in the front-rear direction by being engaged with the partition wheel 11a. Drive band 1
It is composed of a push-pull tool 13 connected to the front end of 2 and a drive band guide portion 14 fixed on the mold receiving frame 5. Further, the main body 11 of each of the push-pull devices P is provided on the front side of the mold receiving frame 5,
The drive band guide portion 14 is attached to the upper surface of the mold receiving frame 5,
Both push-pull devices P are driven by one common prime mover 10.

The drive band 12 has a structure in which idle wheels 12c are provided on both sides of a connecting shaft 12b of a steel chain 12a, and the idle wheels 12c are guide grooves 14a of the drive band guide portion 14.
Since the levitation is restrained by being guided by
By driving 2 to push and pull, the push and pull tool 13 is pushed and pulled back and forth along the drive band guide portion 14 to push and pull the mold D. Further, the leg portion 13a of the push / pull tool 13 is guided along the vertical groove 14b of the drive band guide portion 14, and the push / pull arm 13b of the push / pull tool 13 is movable up and down via the pin 13 so that it can be pushed up and down. The hook portion at the tip of the pull arm 13b is pushably and pullably engaged with the connector 15 of the mold D (FIGS. 8 and 10). Further, the main body 11 of the push / pull device P has a box-like shape, and a drive wheel 11a is attached to the upper part of the inside thereof, and a drive band accommodating portion 11b is formed in the lower part thereof.

The prime mover 10 is a forward / reverse rotatable electric motor with a speed reducer, and is linked to each drive wheel 11a via a clutch 10a so as to selectively drive each drive wheel 11a. An electromagnetic clutch or various other clutches can be used as the clutch 10a. As a traveling drive device 7 for the carriage S of the mold receiving frame 5, a pinion gear 7b, which is rotatable forward and reverse by a motor 7a with a speed reducer for traveling, is attached to the left end of the carriage S, and a rack 7c meshes with the pinion gear 7b. Is attached to the floor, and the rack and pinion mechanism allows the carriage S to travel left and right. Instead of the traveling device 7, the traveling wheels may be rotated to travel.
Reference numerals 17 to 21 in FIG. 5 are limit switches for detecting the position of the carriage S and the position of the mold D.

[0006]

In a processing machine using a mold such as an injection molding machine, it is essential to replace the mold, and it is necessary to manually replace the mold with a conventional crane or to perform the automatic replacement as described above. Although it has been performed using the device, there are the following problems. When using a crane Since there is a tie bar for clamping the mold above the die mounting position, this tie bar interferes with the crane and limits the usability of the crane. Met. In the case of using an automatic changer If the automatic clamping is performed as in the prior art, the precision of the mold, the injection molding machine and the automatic converter must be improved, which becomes very expensive and the apparatus becomes large-scale.
Further, although the cost is reduced if only the clamping of the mold is manually performed, there is a drawback that the equipment is an obstacle during the mold replacement work and the work is unsafe. The present invention is to provide a mold clamping mechanism that enables mold replacement work in a wide working space.

[0007]

Therefore, according to the present invention, there is provided a fixed plate fixed to one end of a base and a fixed plate fixed to the other end of the base or movably provided on the base. On an axis parallel to
In a mold clamping mechanism equipped with a rotatable movable plate that is rotatably mounted and a mold clamping means for clamping the rotatable movable plate to a fixed plate, the rotation of the movable movable plate can be rotated by a rotary drive device until it becomes horizontal. In addition, the rotating movable platen is provided with a conveying means for conveying the mold, and this is a means for solving the problem.

[0008]

When the mold is opened in the normal molding process, the movable platen is placed at an appropriate angle necessary for taking out the molded product, for example, 4 with respect to the horizontal plane.
Stop at a position inclined by about 5 °. When exchanging dies, the male and female dies are grouped together and fixed to the movable platen, and the movable platen is rotated and tilted horizontally. Next, the horizontal conveyor for die exchange is used to pull out from the processing machine, and the vertical conveyor conveys it to the die storage area. Install a new mold in the reverse order.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments of the drawings. An embodiment of the mold clamping mechanism of the present invention will be described with reference to FIGS. FIG. 1 is a side sectional view of this mold clamping mechanism, and FIG. 2 is a view taken in the direction of arrow A in FIG.
FIG. 3 is a plan view showing the arrangement of conveyors.
In the figure, 31 is a base, 32 is a fixed plate fixed to one end of the base 31, 33 is a rotary movable plate provided facing the fixed plate 32, and 34 is a female plate attached to the fixed plate 32. Mold, 35 is a male mold attached to the rotary movable plate 33, 36
Is an injection unit for injecting the molten resin into the molds 34 and 35 which are clamped. 37 is two linear rails fixed to the base 31, 38 is a shaft support that travels on the linear rail 37 via four linear guides 39, and 40 is fixed to the shaft support 38 by a plate key 41. The shaft 42 is a stopper bolt that regulates the position of the shaft support 38, and 43 is a bracket that supports the stopper bolt 42 fixed to the base 31. The lower part of the rotary movable plate 33 has a shaft 40.
It is rotatably supported by the shaft support base 38, and a notch hole 33a having a notch on the upper side is provided in the upper portion.

On the upper and lower sides of the fixed platen 32, a pair of left and right 4
Each of the mold clamping cylinders 32a and piston 44 is built in, and the upper piston 44 has a tie bar (rod).
45 has a tie bar (rod) 4 on the lower piston 44.
6 are connected. An annular stopper 47 that engages with the rotary movable plate 33 is externally fitted to the upper tie bar 45, and a screw portion 45a is provided at the tip. The lower tie bar 46 is screwed to the shaft support 38. Reference numeral 48 is a half nut obtained by dividing the nut in half, and 49 is a cylinder (FIG. 2) for opening and closing the half nut 48, both of which are mounted on the rotary movable plate 33, and when closed, the two half nuts 4 are used.
8 is a threaded portion 4 of the tie bar 45 that forms one nut.
5a is engaged and coupled (FIG. 2).

Reference numeral 50 denotes a long stroke cylinder for rotationally driving the rotary movable plate 33. The outer cylinder portion is provided with a pin 51, and the rod tip is provided with a pin 52.
It is rotatably fastened to the upper part of 2 and the upper part of the rotary movable plate 33, and to one side surface (left side in FIG. 2) of the mold clamping mechanism. 5
Reference numeral 3 is a stopper fixed to the base 31 so that the rotatable movable plate 33 stops horizontally. Further, 54 is a pair of lateral (roller) conveyors that are laterally embedded in the rotary movable plate 33 and are lifted by a cylinder with a small stroke, and 55 is a lateral conveyor 54 along the side surface (the side opposite to the cylinder 50) of the injection molding machine. It is a vertical (roller) conveyor that runs at a right angle, and on the extension of the horizontal conveyor 54, a horizontal conveyor 56 that is lifted by a cylinder is provided as with the horizontal conveyor 454. A lift cylinder 60 lifts the horizontal conveyor 54.

Next, the operation of the mold clamping device having the above-described structure will be described. The position C indicated by the alternate long and short dash line in FIG. 1 shows the state in which the rotary movable plate 33 is open, and the position fixed by the cylinder 50 is fixed. Is. At this time, the tip of the shaft support 38 (the left end in FIG. 2) contacts the stopper bolt 42, and the upper tie bar 45 is in the most protruding position. When the cylinder 50 is contracted in the molding process, the rotary movable plate 33 rotates and stands vertically, and the tie bar 45 penetrates through the notch hole 33a of the rotary movable plate 33 and the paired half nuts 48. , The stopper 47 contacts the rotatable movable plate 33,
The state shown by the solid line in FIG. 1 is obtained. Then half nut 4
8 is closed and joined with the tie bar 45. Half nut 4
The position is adjusted by the stopper bolt 42 and the stopper 47 so that the screw thread 8 and the screw thread and the valley of the screw portion 45a are properly meshed. Next, the rotary movable plate 33 is moved in parallel with the direction of the fixed plate 32 by the upper and lower pistons 44 to clamp the mold.
The molten resin is injected from the injection unit 36, and after cooling, the above operations are performed in the reverse order to open the mold to the C position and take out the molded product.

Explaining the mold replacement work, the female mold 34 is fixed to the male mold 35 while the mold is clamped, and the female mold 34 and the fixing plate 32 are separated from each other. Then, the rod 45 and the shaft support 38 are pushed out by the upper and lower pistons 44 to the position shown by the solid line in FIG. 1 (the cylinder 50 extends), and the half nut 48 is opened. Next, the rotary movable plate 33 is rotated by the cylinder 50 and tilted horizontally to bring the lower surface into contact with the stopper 53 (position D in FIG. 1). Next, the male mold 35 and the rotary movable plate 33 are released from each other, the horizontal conveyor 54 is lifted by the lift cylinder 60, and the horizontal conveyor 56 is further lifted by a cylinder (not shown) to integrally couple the male mold 35 and the female mold 34. As it is, it is pulled out onto the vertical conveyor 55 and conveyed to the mold storage place. Then, a new mold is brought from the mold storage place, and installation is performed in the reverse order of the above. In the above embodiment, the rotary movable plate 33 is described as a device that performs both rotation and parallel movement, but it may be a device that only rotates, and the horizontal conveyor 54, the horizontal conveyor 56, and the vertical conveyor 55. In the above description, a free roller conveyor is used, but a drive conveyor may be used. Further, in the above-described embodiment, the rotation of the rotary movable plate 33 is performed by the long stroke cylinder 50.
It goes without saying that the motor, the speed reducer and the gear may be combined.

[0014]

As described in detail above, according to the present invention, since the die changing work can be performed in a place where there is no tie bar, the work space is wide and the work posture is good. The workability and safety are improved. Also, when using a crane, there are less restrictions on the usability of the crane. Further, since the two molds of male and female are integrally rotated, transferred and stored, the work efficiency of the mold replacement is improved. Further, since the structure is simple, the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a side sectional view of a mold clamping mechanism according to an embodiment of the present invention.

2 is a partial cross-sectional view taken along arrow A in FIG. 1, and a right half is a cross-sectional view taken along line BB in FIG.

FIG. 3 is a plan view showing the arrangement of conveyors.

FIG. 4 is a perspective view showing an entire conventional horizontal molding machine and mold exchanging device.

FIG. 5 is a plan view of FIG.

6 is a cross-sectional view taken along line CC of FIG.

7 is a sectional view taken along line D-D in FIG.

FIG. 8 is an enlarged side sectional view of a main part in FIG.

9 is a front view of the cart in FIG. 8. FIG.

10 is a front cross-sectional view of the drive band guide portion in FIG.

[Explanation of symbols]

 31 Base 32 Fixed Plate 32a Cylinder 33 Rotary Movable Plate 40 Shaft 44 Piston 45,46 Tie Bar 48 Half Nut 49 Cylinder 50 Cylinder 54 Horizontal Conveyor 55 Vertical Conveyor 56 Horizontal Conveyor

Claims (5)

[Claims] 1. A fixed plate fixed to one end of the base, and a rotary plate fixed to the other end of the base and rotatably mounted on a shaft parallel to the fixed plate movably provided on the base. In the mold clamping mechanism provided with the rotary movable plate and the mold clamping means for clamping the rotary movable plate to the fixed plate, the rotation of the rotary movable plate can be rotated until it becomes horizontal by the rotation drive device. The characteristic mold clamping mechanism. 2. The mold clamping mechanism according to claim 1, wherein the rotary movable plate is provided with a transfer unit that transfers a mold. 3. The mold clamping mechanism according to claim 1, wherein the mold clamping means for clamping the rotatable movable plate to the fixed plate is constituted by a tie bar and a half nut. 4. A rotary drive device for the rotary movable plate is constituted by a cylinder pivotally mounted on a fixed plate and having a rod tip pivotally mounted on the rotary movable plate. The described mold clamping mechanism. 5. The mold clamping mechanism according to claim 1, wherein the rotary drive device for the rotary movable plate is configured by a combination mechanism of a motor, a speed reducer and a gear.