JPS61108523A - Injection molding equipment - Google Patents

Abstract

PURPOSE:To enable to control the interval between a movable plate and a fixed plate in a comparatively short time without much labor by a structure wherein a first fixing means to fix a safety bar to the movable plate and a second fixing means to fix the safety bar to the fixed plate. CONSTITUTION:The fixing between a safety bar 6 and a movable plate 2 is released by unscrewing the screw 20a of a split ring 20 so as to expand the bore of the split ring 20. In succession, when a rotating body 24 is turned in the direction that a steel ball 25 is directed from the basic end 30a to the termi nal end 30b of a groove 30, the steel ball 25 gradually moves to the deeper portion of the groove 30, because the opening width W of the groove 30 increases gradually towards the terminal end. A push pin 23 at the position, at which the steel ball is in the deeper portion of the groove, pushes the safety bar strongly, resulting in fixing the safety bar 6 to the fixed plate 3 by means of the pressing force of the push pin. Due to the operation as described above, the safety bar 6 is made shiftably to the movable plate and fixed to the fixed plate 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an injection molding apparatus equipped with a safety device that controls the mold closing operation of a movable plate when a safety door is open.

(Prior Art) In general, injection molding equipment is equipped with a safety door (it-
We are prepared. The safety door 1 is installed on the side of the movable plate 2 and runs on a rail (not shown) extending along the moving direction of the movable plate 2, and when closed, the movable plate 2 and the fixed plate 3 are connected to each other. The space between the movable plate 2 and the fixed plate 3 is closed off from the outside.

However, such a safety door 1 will not be effective unless it is closed during mold clamping.

Therefore, when the safety door 1 is not closed, an interlock device is activated using hydraulic pressure or electricity to prevent the mold clamping operation, but in consideration of the case where such interlock device does not operate, Generally, a mechanical locking device is also used.

5 and 6 show a conventional mechanical locking device, in which a bracket 5 is attached to the top surface of the movable plate 2 via a port 4. As shown in FIG.

This bracket 5 has a sliding hole 7 through which a safety bar 6 can freely move. A pair of ports 8, 8 are screwed into the safety par 6 so as to be located on both sides of the bracket 5. aA Porto 8,8 is a safety par-6
This is for fixing the port 8, 8 to the movable plate 2, and the ports 8, 8 are screwed in the direction closer to the bracket 5, and as shown in the figure, are brought into contact with the end surface of the bracket 5 and tightened. As a result, the safety bar 6 is fixed to the bracket 5.

In the same figure, reference numeral 3 denotes the above-mentioned movable plate, and a safety bar 6 is also attached to the bracket 11 on the top surface of which a bracket 11 is fixed via a port IO in the same way as in the movable plate 2. A slidable sliding hole 13a is formed. The bracket 11 consists of a mounting part 12 that is mounted on the movable plate 2 and a guide part 13 formed on the mounting part 12 and provided with the above-mentioned sliding hole. These are installed at predetermined intervals in the longitudinal direction of the safety bar 6.

A support rod 14 is provided in a protruding manner on the mounting portion 12, and a lock plate 1 is connected to the support rod 14 via a shaft 14a.
The base end of 6 is rotatably attached. The tip of the lock plate 16 is larger than the cross-sectional area of the safety bar 6 (see FIG. 7), and is
．． 13, and when lowered, it comes into contact with the mounting part 12 and the sliding hole 13a of the guide part 13.
It is designed to block out. Note that 14b is a vibration force point into which the safety bar 6 can freely enter.

As shown in FIGS. 5 and 6, a cam 17 is attached to the upper part of the front end of the safety door 1.
A roller 18 rotatably attached to the base end of the lock plate 18 is engaged with the lock plate 18 .

The cam 17 has a straight part 17a parallel to the longitudinal direction of the safety bar 6, and an inclined part 17b continuous to the front end of the straight part 17a.
It is rotatably engaged with the lower surface of the.

Next, to describe the operation of such a conventional device, FIGS. 5 and 6 show a state in which the safety door 1 is closed. In this state, the roller 18 of the lock plate 1B is moved in the straight line of the cam 17. The tip of the lock plate 18 is located above the sliding hole 13a, away from the mounting portion 12 of the bracket 11, and therefore the tip of the safety bar 6 is located on the front side. That is, it can enter into the sliding hole 13a of the guide portion 13 on the right side in the drawing. Therefore, the mold clamping operation can be performed without any problem.

When safety door 1 is opened from the above state, that is, when safety door l is moved to the left in one drawing, lock plate 1
The roller t8 of G moves from the straight portion 17a to the inclined portion 17b. This inclined portion 17b has a front end (
Since the right end (on the Tf4 plane) is formed so that it is lower than the rear end, the roller IB that has reached the inclined part 17b will rise toward its front end. As a result, the rock brake) 1B rotates so that the tip part descends due to its own weight, in other words,
It rotates counterclockwise from the position shown by the solid line in FIG. 7, and finally comes into contact with the mounting portion 12. In this state, even if the safety bar 6 tries to move to the right in the drawing during mold clamping, its tip end surface will not touch the lock plate 16.
Since the mold comes into contact with the mold, the mold clamping operation cannot be performed.

Incidentally, the thicknesses of the molds ta and ts are selected from various values depending on the application, and it becomes necessary to adjust the distance between the plates 2 and 3 when the molds are opened to the maximum accordingly. Conventionally, this adjustment was performed using a port 8 screwed onto the safety bar 6,
8 was loosened and the movable plate 2 was moved manually.

(Problems to be Solved by the Invention) As mentioned above, in the above conventional example, the movable plate 2 and the fixed plate 3
The movable plate 2 is manually moved when adjusting the distance g4w1 between the movable plate 2 and the movable plate 2, but this operation requires a lot of labor and time when the device becomes large.

The present invention has been made to solve these problems, and aims to provide an injection molding device that can adjust the distance between the movable plate and the fixed plate in a relatively short time without requiring much effort. That is.

(Means for Solving the Problems) The present invention provides fixing means for fixing the safety bar on the movable plate and the fixed plate, and also provides the following features: 1. When the safety door is in the open position, the safety door engages with the safety bar. when the safety door is in the closed position.

It has a lock plate that assumes a release position away from the safety bay.

(Function) When adjusting the length of the safety bar between the movable plate and the fixed plate at the time of maximum mold opening, after releasing the first fixing means and fixing the safety bar to the fixed plate by the second fixing means, When the movable plate is moved by hydraulic pressure and the position setting of the movable plate is completed, the safety bar is fixed to the movable plate by the first fixing means and the second fixing means is released.

(Example) The present invention will be described below with reference to examples shown in the drawings. In FIG. 1, the same reference numerals as in FIGS. 4 to 7 indicate the same or corresponding parts.

As shown in FIG. 1, the movable plate 2 has, as in the conventional example,
A bracket 5 is fixed, and a split ring 20 constituting a first fixing means for fixing the safety bar 6 is fixed to the bracket 5. This split ring 2
0 has a pair of screws 20a, 20a, and the screw 20a.

When 20a is tightened, the diameter of the split ring 20 is reduced.

A bracket 11 similar to that of the conventional example is fixed to the fixed plate 3, and a guide portion 13 on the rear side constituting this bracket 11, that is, a guide portion 13 on the left side in the drawing, has a bracket 11 as shown in FIG. As such, a second fixing means 2t4s for fixing the safety bar 6 is provided. As shown in FIG. 3, this second fixing means 21 is arranged between a fixing base 22 fixed to the upper surface of the guide part 13, a pressing pin 23 and one rotating body 24, and a space between the fixing base 22 and the rotating body 24. a steel ball 25 provided in the
It is composed of.

To explain this in more detail, in the center of the fixed base 22, there is a small diameter part 27a and a large diameter part 2 located below this.
A through hole 27 consisting of 7b is formed. A press pin 23 is slidably and rotatably fitted into the small diameter portion 27a of the through hole 27, one end of which reaches the lower part of the large diameter portion 27b, and the other end of which extends upward from the small diameter portion 27a. It stands out. A boot 28 made of an elastic member such as rubber is attached to one end of the pressing pin 23. Further, a spring 28 is wound around one end of the pressing pin 23, and one end of the spring 2B is in contact with an end surface 28 forming a step between the large diameter portion 27b and the small diameter portion 27&. The other end is
The press pin 23 is in contact with the upper end surface of the boot 28, and is biased downward by the spring 26.

Further, a groove 30 is formed on the upper surface of the fixing base 22 so as to surround the through hole 27 . This groove 30 is provided over a range of about 2700 degrees, and its opening width W gradually increases from the base end 3Qa of the groove 30 toward the terminal end 30b, and reaches the maximum width at the terminal end 30b. ing.

A through hole 24a is formed in the center of the rotating body 24, and a press pin 23 protruding from the fixing base 22 is fitted into the through hole 24a. A recess 31 is formed in the lower surface of the rotating body 24.

A steel ball 25 is slidably attached to this recess 31. When the rotating body 24 is rotated, the steel ball 25 moves into the groove 30.
It will roll along.

Next, we will discuss the case of adjusting the distance between the movable plate 2 and the fixed plate 3 based on the above configuration. First, the safety The fixation between the bar 6 and the movable plate 2 is released. Next, the rotating body 24 is moved into the groove 3 by the steel ball 25.
When the steel ball 25 is rotated in the direction from the base end 30a to the terminal end 30b of the groove 30, the opening #AW of the groove 30 gradually increases toward the terminal end, so the steel ball 25 gradually enters the deep part of the groove 30. Moreover, the pressing pin 23 is connected to the spring 26.
Since the rotating body 24 is elastically biased downward by the rotating body 24, the rotating body 24 gradually descends, and the pressing pin 23 also descends together with this. When the steel ball 25 reaches the terminal end 30b of the groove 30, the lower surface of the rotating body 24 comes into contact with the upper surface of the fixed base 22, and the amount of descent of the press pin 23 becomes maximum. In this position, the pressing pin 23 firmly presses the safety bar 6.

This pressing force causes the safety bar 6 to be fixed to the fixing plate 3.

That is, the above-mentioned 2 regarding the first fixing means and the second fixing means
By this operation, the safety bar 6 becomes movable relative to the movable plate 2 and fixed relative to the fixed plate 3. In this state, operate the side cylinder (not shown).

For example, the position of the movable plate 2 is set by moving the movable plate 2 to the position shown by the chain line in FIG.

After the distance between the movable plate 2 and the fixed plate 3 has been newly set in this way, the screw 20a of the split ring 20 is removed.

By tightening 20a, the split ring 20 is reduced in diameter, the safety bar 6 is fixed to the movable plate 2, and the rotating body 24 is rotated in the opposite direction to the above-mentioned direction.

This rotation causes the steel ball 25 to move from the terminal end 30b of the groove 30 toward the base end 30a, and as the rotating body 24 gradually rises, the pressing pin 24 fixed thereto will also rise along with this,
The pressing force of the suppression bin 23 against the safety bar 6 will decrease. When the steel ball 25 reaches the starting end 30a of the groove 30, the suppressing pin 23 is separated from the safety bar 6.

In this state, as long as the lock plate 18 is not lowered, in other words, as long as the safety ml is closed, there is no obstacle to the movement of the safety bar 6, and therefore the mold clamping operation is possible.

Note that after setting the distance between the movable plate 2 and the fixed plate 3,
Even if one forgets to release the second fixing means 21, the pressing force applied to the pressing pin 23 is applied by the spring 28, so the second fixing means 21 will be damaged. There is no such thing.

(Effects) As is clear from the above, the present invention includes a first fixing means for fixing the safety bar to the movable plate and a second fixing means for fixing the safety bar to the fixed plate. When adjusting the distance between the safety bar and the safety bar, it is possible to fix the safety bar to the fixed plate using the W42 fixing means, so the movable plate can be moved by a cylinder, and almost no human power is required. This makes it possible to reduce costs and shorten work time.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the device according to the present invention, Fig. 2(a) is a side view of the first fixing means, Fig. 2(b) is a side view of the second fixing means, and Fig. 3 is a side view of the second fixing means. 4 is a general view of the device, FIG. 5 is a side view of the conventional example, FIG. 6 is a plan view of the device shown in FIG. 5, and FIG. 7 shows the operating state of the lock plate. FIG. 6 is a view taken along line A-A in FIG. 6; l...Safety gate 2...Movable plate 3...Fixed plate 6...Safety bar

Claims (2)

[Claims] (1) Provided to be movable along the moving direction of the movable plate,
In an injection molding apparatus equipped with a safety door that can close the space between the movable plate and the fixed plate from the side, a safety bar movably supported on each of the movable plate and the fixed plate;
first and second fixing means for fixing the safety bar provided on each of the movable plate and the fixed plate; and when the safety door is in the open position, the safety bar is engaged with the safety bar. and a lock plate that takes a lock position to prevent movement, and takes a release position away from the safety bar when the safety door is in the closed position, and when the mold is opened or closed, the safety bar is held by the first fixing means. When fixing the safety bar to the movable plate and releasing the fixation of the safety bar by the second fixing means, and adjusting the length of the safety bar between the movable plate and the fixed plate at the time of maximum mold opening, the first fixing means is fixed to the movable plate. An injection molding apparatus characterized in that when the safety bar is released, the second fixing means fixes the safety bar to the fixed plate and moves the movable plate. (2) A bracket having an insertion hole through which the safety bar can be freely inserted is attached to the fixed plate, and the bracket further has a through hole formed in a direction perpendicular to the longitudinal direction of the insertion hole, A fixed rod that can be pressed against the safety bar in the insertion hole is inserted into this through hole, and this fixed rod is pressed against the safety rod via an elastic member such as rubber attached to its tip. The injection molding apparatus according to claim 1, wherein the safety bar is fixed to the movable plate.