JPH045304Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a mechanical safety device for a vertical mold clamping device such as a plastic injection molding machine, a die-casting machine, or a press.

(Prior art and its problems) Generally, a mold clamping device that opens and closes a mold is equipped with a safety door that prevents a part of the worker's body from entering between the molds during the mold clamping operation. An electrical, hydraulic, pneumatic, or mechanical interlock is provided to prevent mold clamping operation when the mold is closed.

Conventionally, this type of mechanical safety device has a device installed at right angles to the mold clamping direction on the sides of a pair of upper and lower mold mounting plates 1 and 7 arranged opposite each other, as shown in FIGS. 1 to 7. A safety door 9 that can be opened and closed in the direction shown in FIG. A stopper rod 22 that extends in the mold clamping direction and has a length that does not reach the stopper plate 16 at the limit position is attached to the upper mold mounting plate 7, and the stopper rod 22 is attached to the stopper plate 16 so that the safety door 9 is pushed to the maximum in the door closing direction. When the safety door 9 is closed and fixed with a door lock device, the hole 19 of the stopper plate 16 and the stopper rod 22 become concentric, and the stopper rod 22 can pass through the hole 19 when the mold is clamped. 22 does not hit the stopper plate 16, so the mold clamping operation can be performed, but if the safety door 9 is even slightly open, the hole 19 of the stopper plate 16
A mechanical mold clamping safety device has been developed in which the stopper rod 22 and the stopper rod 22 are not concentric, and the stopper rod 22 hits the top surface of the stopper plate 16 at right angles, thus making the mold clamping operation impossible (actually). 1986-
(See Publication No. 39095).

However, in mold clamping devices that open and close molds in the vertical direction, such as press machines, vertical injection molding machines, and die casting machines, the weight of the movable parts (upper mold mounting plate 7, upper mold 8, etc.) In order to prevent falling, a counterbalance valve 29 is provided in the hydraulic circuit controlled by the switching valve 28 of the mold clamping cylinder 5, as shown in FIG. This balances the pressure generated on the rod side of the mold clamping cylinder 5 and prevents the movable parts from falling due to their own weight. Furthermore, a pilot check valve 30 may be provided to prevent oil leakage from the counterbalance valve 29 itself, but in any case, internal leaks from the packing in the mold clamping cylinder 5 or minute leaks from the pilot check valve 30, etc. Unavoidably, if the safety door 9 is left open for a long time, the tip of the stopper rod 22 will hit the top surface of the stopper plate 16 due to the slight movement and fall of the movable part, and the next time the safety door 9 is closed, the gap between the two will be The stopper plate 16 cannot be moved smoothly due to friction, and the mold clamping operation cannot be performed unless the movable part is lifted and the stopper rods 22 of the holes 19 of the stopper plate 16 are positioned concentrically.

(Purpose of the invention) The present invention was made in order to solve the above-mentioned conventional problems, and its purpose is to enable the stopper plate to move smoothly even when the stopper bar is in contact with the top surface of the stopper plate. do.

(Means for solving the problem) The mechanical safety device for a vertical mold clamping device of the present invention is provided on the sides of a pair of upper and lower mold mounting plates arranged oppositely, and can be opened and closed in a direction perpendicular to the mold clamping direction. A safety door is provided, and a stopper plate that is pushed in the door closing direction by the safety door and biased in the door opening direction is provided on the lower mold mounting plate, and the stopper plate is reached at the mold opening limit position. A stopper rod along the mold clamping direction with a length that is not long is attached to the upper mold mounting plate, and a hole is formed in the stopper plate through which the stopper rod can pass through at the position where the safety door is pushed the most in the door closing direction. established,
The present invention is characterized in that rotating bodies that can roll and come into contact with each other are mounted on the upper surface of the stopper plate or the end surface of the stopper rod on a line in the door closing direction passing through the center of the hole.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 9.

In the figure, 1 is a lower mold mounting plate that is supported and fixed on the frame 2. On the mounting plate 1, a plurality of tie bars 4 (four in the example) whose lower ends are connected by a mold clamping plate 3 are vertically connected. A mold clamping drive device 5 (a cylinder in the embodiment) which extends slidably through the mold clamping plate 3 and has one end connected to the mold clamping plate 3, and a lower mold 6 are attached.

Reference numeral 7 denotes an upper mold mounting plate mounted on the upper end of the tie bar 4, and an upper mold 8 facing the lower mold 6 is mounted on the mounting plate 7.

Reference numeral 9 denotes a safety door, which is movable in the direction perpendicular to the mold clamping direction (horizontal direction in Fig. 1) via a guide mechanism consisting of rollers 10, rails 11, etc. on the sides of the upper and lower mold mounting plates 1 and 7. The upper and lower molds 6 and 8 can be opened or closed by moving to the left or right in FIG. 1, respectively. On the back side of this safety door 9, there is a dog 1 that protrudes in a direction perpendicular to the door opening/closing direction.
2 is provided.

13 is a square cylindrical stopper plate guide, and a bracket 14 is attached to the lower mold mounting plate 1 along the door opening/closing direction.
The guide 13 is installed through the guide 13 and opens only in the door opening direction. Corresponding holes 15 are provided in the upper and lower opposing walls of the stopper plate guide 13.

16 is a stopper plate, and the stopper plate guide 1
3, and is held by a retainer 17 so as not to come out in the door opening direction, and is urged in the door opening direction by a pushing device 18 (a spring in the embodiment) to prevent the stopper plate from coming out. 1
It stands out from 3. This stopper plate 16 is
The tip is disposed so as to be able to come into contact with the dog 12 of the safety door 9, and is pushed in the door closing direction by receiving a force from the safety door 9 that overcomes the force of the pushing device 18. The stopper plate 16 is provided with a hole 19 that coincides with the hole 15 at the position shown in FIG. 7, which is pushed the most in the door closing direction.

A stopper rod holder 20 is attached to the upper mold mounting plate 7, and the holder 20 is provided with a screw hole 21 extending in the mold clamping direction.

Reference numeral 22 denotes a stopper rod made of a threaded rod extending in the mold clamping direction, which is screwed into the screw hole 21 of the stopper rod holder 20 and tightened with a lock nut 23 screwed onto the stopper rod 22, so that the stopper plate guide 13 It is arranged on the center line of the hole 15. This stopper rod 22 can be adjusted depending on the molds 6 and 8 so that the lower end surface does not reach the stopper plate 16 at the mold opening limit position shown in FIG.

The holes 15 and 19 are formed in a size that allows the stopper rod 22 to pass through the holes 15 and 19 by the mold clamping operation when they are aligned, and when the stopper rod 22 passes through the holes 15 and 19, the mold is clamped. The movement is now allowed.

The present invention provides a mechanical safety device for a vertical mold clamping device as described above, in which the stopper rod 22 is resiliently supported by a spring 24 on the tip end surface, and the ball stopper 25 is elastically supported by a spring 24.
The ball 26 (see Fig. 8) or the supported roller 27 (see Fig. 9) is prevented from falling off.
A rotating body is provided which rolls into contact with the upper surface of the stopper plate 16. The same effect can be obtained even if the rotating bodies are mounted in a row on the upper surface of the stopper plate on the door closing direction line passing through the center of the hole 19.

(Function) When the safety door 9 is closed to the right in Fig. 1 and fixed with a door lock device (not shown), the stopper plate 1
6 is pushed the most in the door closing direction by a force that overcomes the force of the pushing device 18 and is held at that position. At this time, the hole 19 of the stopper plate 16 is aligned with the hole 15 of the stopper plate guide 13, so when the upper mold mounting plate 7 is moved downward by the extension operation of the mold clamping drive device 5, the stopper rod 22 is It passes through the matching holes 15 and 19, allowing the mold clamping operation to be performed.

However, if the safety door 9 is opened even a little,
The stopper plate 16 is pushed out in the door opening direction by the force of the extrusion device 18, and the holes 15 and 19 are not aligned, and the stopper rod 22 hits the stopper plate 16 at right angles and is securely supported. , and the mold clamping operation becomes impossible.

In addition, because the safety door 9 was left open for a long time, the movable part may move slightly and fall, causing the stopper bar 2 to fall.
2 hits the upper surface of the stopper plate 16 at a right angle, the stopper plate 16 is pushed in the door closing direction by rolling contact by a rotating body such as the ball 26 or roller 27, and the stopper plate 16 is closed. Connect hole 19 to hole 15 of stopper plate guide 13.
Since it can be arranged concentrically with the stopper rod 22, the mold clamping operation can be carried out smoothly.

(Effect of the invention) As described above, in this invention, the stopper rod can penetrate the hole provided in the stopper plate and perform the mold clamping operation only when the safety door is closed, but when the safety door is open, the hole is closed. As the position shifts, the stopper rod comes into contact with the stopper plate, and further mold clamping operation is impossible. Therefore, the structure and operation are simple and compact, but the mold clamping operation when the safety door is open is possible. This can be reliably prevented, and it is also possible to reliably prevent personal injury caused by getting a hand or the like caught between the molds. In addition, even if the stopper rod touches the top surface of the stopper plate due to the slight downward movement of the movable part, the stopper plate can be smoothly pushed in the door closing direction due to the rolling contact between the two. It has the effect of closing the safety door without having to lift it up and moving smoothly to the mold clamping operation.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the present invention with the safety door omitted and the door open; Figs. 2 and 3;
Figure 4 is a right side view, top view, and partially enlarged plan view taken in the direction of the arrows in Figure 1, Figure 5 is a sectional view taken along the line ~ in Figure 4, and Figure 6 is taken along the line ~ in Figure 5. 7 is a plan view corresponding to FIG. 4 showing the door in the closed state, FIG. 8 is an enlarged sectional view of the main part, FIG. 9 is an enlarged sectional view of the main part of another embodiment of the present invention, and FIG. The figure is a hydraulic circuit diagram for controlling the mold clamping cylinder. 1...Lower mold mounting plate, 3...Mold clamping plate, 4...Tie bar, 5...Mold clamping drive device, 7...Upper mold mounting plate, 9...Safety door, 12...Dog, 13 ……
Stopper plate guide, 15, 19...hole, 16...
...Stopper plate, 18...Extrusion device, 20...
Stopper rod holder, 22...stopper rod,
24...Spring, 25...Ball stop, 26...Ball, 27...Roller.

Claims (1)

[Scope of utility model registration request] A safety door that can be opened and closed in a direction perpendicular to the mold clamping direction is provided on the side of a pair of upper and lower mold mounting plates that are arranged opposite each other, and the safety door is attached in the door opening direction when the safety door is pushed in the door closing direction. A biased stopper plate is installed on the lower mold mounting plate, and a stopper bar along the mold clamping direction with a length that does not reach the stopper plate at the mold opening limit position is installed on the upper mold mounting plate, and the stopper bar is attached to the upper mold mounting plate. A hole is provided in the plate through which the stopper rod can pass through at a position where the safety door is pushed the most in the door closing direction, and the stopper rod is rolled onto the top surface of the stopper plate or the end surface of the stopper rod on a line in the door closing direction passing through the center of the hole. A mechanical safety device for a vertical mold clamping device characterized by being equipped with a contactable rotating body.