JPH0642825Y2 - Movable base locking device for injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to an injection molding machine for press-fitting a molten plastic material into a mold to mold it into a predetermined shape, and in particular, to divide a movable side during molding. The present invention relates to a locking device that prevents movement of a movable base that supports a mold.

(Prior Art) As a conventional technology, a guide rod is vertically fixed to four corners of a rectangular fixed base that locks a lower die, and a rectangular movable base that locks an upper die is slid on each guide rod. Fit as much as possible, fix the support base to the upper end of each guide rod,
The hydraulic cylinder mechanism is supported upright on the support base, the lower end of the operating rod is connected to the movable base, and the operating rod is extended to lower the movable base and press the upper die to the lower die. There was something that became.

(Problems to be solved by the invention) In the above-mentioned conventional one, the upper and lower dies are pressed against each other by the pressure force of only the cylinder mechanism to prevent the hot water supplied into the dies from leaking from the split surface of the upper and lower dies. Therefore, a large-capacity cylinder mechanism with a large pressing force is required, and there is a drawback that it becomes large and expensive.

It is an object of the present invention to obtain a new movable base locking device for an injection molding machine that solves the above drawbacks.

(Means for Solving the Problems) The present invention is configured as follows in order to achieve the above object.

That is, a guide rod is erected and fixed to a fixed base that locks one split mold, and a movable base that locks the other split mold is slidably fitted to the guide rod, and the guide rod is attached to the tip of the guide rod. The support base is fixed, the cylinder mechanism is erected on the support base, and its operating rod is connected to the movable base, and the locking rod with rack-shaped teeth formed on the outer peripheral surface is slidably fitted to the support base. At the same time, one of the shaft ends is connected to the movable base, and an engaging piece that can be engaged and disengaged is provided on the teeth of the engaging rod by moving from the orthogonal direction of the engaging rod on the support base side. The drive device is provided to move the stop rod from the orthogonal direction to the approaching / separating direction.

(Operation) Since the present invention is configured as described above, when the cylinder mechanism is extended, the movable base moves in the direction of the fixed base, and the split mold attached to the movable base changes to the split mold attached to the fixed base. Will come into contact with.

Further, as the movable base moves, the locking rod slides in the support base and moves toward the fixed base.

When the driving device is operated in this state to move the engagement piece in the locking rod direction, the engagement piece engages with the teeth of the locking rod, and the locking rod is integrally connected to the support base. The movable base is integrally connected to the support base via the locking rod.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In the drawings, FIG. 1 is a front view showing an embodiment of the present invention,
2 is a plan view thereof, and FIG. 3 is a right side view of FIG.

In the drawing, 1 is a fixed base having a rectangular shape in plan view, and four guide rods 4 are provided at four corners of the fixed base 1.
To stand upright.

The lower die 2 forming one of the split dies is placed on the central portion of the upper surface of the fixed base 1 and fixed by the fastener 3.

Reference numeral 5 denotes a movable base having a rectangular shape in plan view. The movable base 5 is arranged horizontally, and its four corners are slidably fitted to the guide rods 4, and the movable base 5 has a central portion on the lower surface thereof. The upper die 6 forming the other split die is opposed to the lower die 2 and fixed by the fastener 7.

In addition, 2a and 6a are cavities formed in the facing portions of the lower mold 2 and the upper mold 6.

A support base 8 having a rectangular shape in a plan view is horizontally arranged and fixed to the upper end portion of each of the guide rods 4, and a hydraulic cylinder mechanism 10 is erected and supported upward at the center of the support base 8.

In this cylinder mechanism 10, the operating rod 11 is projected downward, and the central portion of the movable base 5 is integrally connected to the lower end of the operating rod 11, whereby the cylinder mechanism 10 is expanded and contracted to move the movable base 5. Move up and down.

At the four corners of the movable base 5, four locking rods 12 are erected and fixed upward. That is, the threaded portion 12b formed at the lower end is inserted into the movable base 5, and the upper and lower nuts 14 and 14 screwed onto the threaded portion 12b are tightened and fixed to the movable base 5 by standing.

The locking rod 12 is one side surface of the prismatic main body, that is, the first side.
In the figure, rack-shaped teeth 12a projecting at a predetermined pitch in the up-down direction are formed on one side surface facing in the left-right direction.

U-shaped receiving members 13 are fixed to the four corners of the support base 8, and the locking rods 12 are slidably fitted to the receiving members 13 with their teeth 12a exposed.

Further, the drive device 15 including an air cylinder mechanism is fixedly supported at the four corners of the support base 8.

The drive device 15 is arranged horizontally and orients its operating rod 16 toward the teeth 12a of the locking rod 12.

An engaging piece 17 is integrally connected to the tip of the operating rod 16. As shown in FIG. 1, this engaging piece 17 has rack-shaped teeth 17a protruding vertically at a predetermined pitch on the surface facing the teeth 12a, and the teeth 17a are engaged with the teeth 12a. It will be possible.

Then, by operating the drive device 15, the engaging piece 17 is moved in the direction orthogonal to the locking rod 12 and disengaged from the tooth 12a of the locking rod 12.

Next, the operation mode of the above embodiment will be described.

When the cylinder mechanism 10 is extended, the movable base 5 descends and moves in the direction of the fixed base 1, and the upper die 6 attached to the movable base 5 comes into pressure contact with the lower die 2 attached to the fixed base 1.

At the same time, as the movable base 5 moves downward, the locking rod 12
While sliding on the inside of the base metal 13, it moves toward the fixed base 1.

When the drive device 15 is extended in this state, the engaging piece 17 moves in the direction of the locking rod 12 and its teeth 17a move toward the locking rod 12.
Engages with the tooth 12a.

As a result, the locking rod 12 is integrally connected to the support base 8, and the movable base 5 is integrally connected to the support base 8 via the locking rod 12 so that it cannot move up and down.

In this state, molten plastic material, that is, hot water, is injected into the cavities 2a, 6a of the upper and lower molds 6,2.

Then, the upward movement of the upper mold 2 due to the pouring of the hot water is blocked mainly by the engaging force between the teeth 17a of the engaging piece 17 and the teeth 12a of the locking rod 12.

In this case, since the engaging piece 17 and the locking rod 12 are engaged with each other by the rack type teeth 17a and 12a, even if the pressing force of the drive device 15 is small, that is, the size is small, the upper die 2 The locking force for the upward movement of the will increase.

Further, when taking out the molded product, first, the driving device 15 is shortened to retract the engaging piece 17 from the locking rod 12 and disengage its teeth 17a from the teeth 12a of the locking rod 12.

As a result, the locking rod 12 becomes slidable with respect to the support base 8.

Next, when the cylinder mechanism 10 is operated to be shortened, the movable base 5, and hence the upper mold 6, is lifted and separated from the lower mold 2, whereby the molded product can be taken out.

(Effect of the Invention) As is clear from the above description, according to the present invention, the locking rod having the rack-shaped teeth formed on the outer peripheral surface is slidably fitted to the support base and one of the shaft ends is movable. A cylinder that reciprocates the movable base because it is connected to the base and the engaging piece provided on the support base side is moved from the direction orthogonal to the locking rod by the driving device to engage and disengage with the teeth of the locking rod. Even if the mechanism has a small capacity, the locking force of the split mold at the time of molding can be increased, and the effect of making the injection molding machine small and inexpensive can be obtained.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a right side view of FIG. 1: Fixed base, 2: Lower mold (one split mold), 2a: Cavity, 3: Fastener, 4: Guide rod, 5: Movable base, 6: Upper mold (other split mold), 6a: Cavity, 7: Fastener, 8:
Support base, 10: Cylinder mechanism, 11: Actuating rod, 12: Locking rod, 12a: Tooth, 13: Bracket, 14: Nut, 15: Drive device, 1
6: Actuating rod, 17: Engagement piece, 17a: Tooth.

Claims (1)

[Scope of utility model registration request] 1. A guide rod is erected and fixed to a fixed base that locks one split mold, and a movable base that locks the other split mold is slidably fitted to the guide rod. A support base is fixed to the tip, the cylinder mechanism is erected and supported on the support base, and its operating rod is connected to a movable base, and a locking rod with rack-shaped teeth formed on the outer peripheral surface can slide on the support base. And one of the shaft ends is connected to the movable base, and the engaging rod is provided with an engaging piece that can be engaged and disengaged with the teeth of the locking rod by moving from the orthogonal direction of the locking rod on the support base side. A movable base locking device for an injection molding machine, comprising a drive device for moving a piece from a direction orthogonal to the locking rod to a contacting / separating direction.