JPH0736736Y2 - Mold clamping safety device for injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a mold clamping safety device for an injection molding machine.

(Prior Art) Conventionally, a molding material that is heated and fluidized in a heating cylinder is injected into a mold by high pressure, cooled and solidified or hardened therein, and then the mold is opened to take out a molded product. The injection molding machine has the following structure.

That is, a mold clamping device and an injection device are installed on a machine base, and the mold clamping device includes a fixed mold mounting body and a movable mold mounting body, and the mold clamping cylinder has a movable mold mounting body. When reciprocating, the fixed mold and the movable mold come into contact with and separate from each other.

On the other hand, the injection device is provided with a nozzle for reciprocating, which heats and melts the resin supplied from the hopper and injects the resin, and the molten resin is injected from the nozzle into the mold recess, that is, the cavity.

In the above-mentioned mold clamping device, actuators such as a mold clamping cylinder and a link mechanism are operated in response to various operations such as mold closing, mold clamping, and mold opening, and the movable platen is reciprocally moved to bring the mold into and out of contact. However, a safety door is provided in the mold clamping unit so that the operator's hand and clothes are not caught when these elements are activated.

Then, when the safety door is opened, the safety device is activated to perform interlock by a system such as mechanical, hydraulic, and electrical.

FIG. 6 is a diagram showing an example of a conventional mechanical interlock.

In the figure, 1 is a fixed platen to which a fixed mold is attached, and 2 is a movable platen to which a movable mold is attached and which reciprocates along a tie bar 3 to bring the movable mold into and out of contact with the fixed mold. . The movable platen 2 is operated by a mold clamping cylinder.

Reference numeral 6 is a safety door which is arranged in front of the movable platen 2 and a mold (not shown) so as to be openable and closable. The safety door 6 swings a shutter 8 attached to the fixed platen 1 via a cam. When the safety door 6 is opened, the shutter 8 closes the passage of the rod 9. Since the rod 9 is attached to the movable platen 2, the passage of the rod 9 is closed and its movement is restricted, so that the movable platen 2 is interlocked.

Further, there is provided one in which a long cam is arranged on the base plate and the movement of the movable platen is restricted by utilizing the long cam.

FIG. 7 is a diagram showing another example of a conventional mechanical interlock,
FIG. 7 (A) is a front view of the interlock, and FIG. 7 (B) is a side view of the main part of the interlock.

In the figure, 11 is a movable platen, 12 is a tie bar, 13 is a rod that moves together with the movable platen 11, and 15 is a shutter for restricting the movement of the rod 13. The shutter 15 swings around a fulcrum 16.

Further, reference numeral 18 denotes a cam which is arranged on the base plate and swings around a fulcrum 19, and the shutter 15 is driven by the movement of the cam 18.

In addition to the mechanical interlock described above, a hydraulic interlock is provided.

In this case, the rod is passed through the lower part of the safety door, and the movement of the safety door is detected by the cams provided at both ends of the rod to push the arm of the cam operation switching valve.

(Problems to be Solved by the Invention) However, in the mold clamping safety device of the conventional injection molding machine described above, when the shutter 8 is provided on the fixed platen 1 as shown in FIG. 6, the movable platen 2 reciprocates. Since the rod 9 moves in front of the mold in accordance with the movement, the operability of the operator and the take-out machine is deteriorated, and there is a risk of contact with the rod 9, which is dangerous.

In the case where the cam 18 is arranged on the base plate as shown in FIG. 7, a long cam corresponding to the die thickness moving stroke is used.
18 is required, and the interlock structure becomes complicated.

Furthermore, in the case of the hydraulic interlock, not only is it necessary to pull the hydraulic piping under the safety door, but attention must be paid to oil leakage.

Further, in the mold clamping safety device of the conventional injection molding machine, the mechanical mold clamping safety device is provided only on the operating side, and it operates only when the safety door on the operating side is opened. Therefore, if you want to operate the mechanical mold clamping safety device even if the safety door on the non-operation side is opened, do you additionally install a safety device with the above structure on the non-operation side? Since it is necessary to use the link mechanism to transmit the movement on the operating side to the non-operating side, the cost increases.

The present invention solves the problems of the mold clamping safety device of the conventional injection molding machine described above, does not reduce the operability of the operator and the take-out machine, is safe and has a simple structure, and there is no concern about oil leakage. It is an object of the present invention to provide a mold clamping safety device for an injection molding machine, which is free from the above and can be easily adapted to a safety door on the opposite side.

(Means for Solving the Problems) Therefore, in the mold clamping safety device of the injection molding machine of the present invention, a cam that is disposed at the lower end of the safety door and operates when the safety door is opened, and It has a wire cable that is connected and that moves forward and backward in response to the operation of the cam, and a stopper that is connected to the other end of the wire cable and that operates as the wire cable moves forward and backward. The stopper is composed of a hydraulic, mechanical, or electric interlock.

The safety door is provided on each of the operating side and the non-operating side, and a pair of cams is provided corresponding to each.
A rod that integrally connects the pair of cams is provided.

Further, it has a return spring for generating the return force of the wire cable and adjusting the stroke of the wire cable.

(Operation) According to the present invention, the cam, which is arranged at the lower end of the safety door and operates when the safety door is opened as described above, is connected to the cam, and moves back and forth according to the operation of the cam. And a stopper that is connected to the other end of the wire cable and that operates as the wire cable advances and retracts.

Therefore, when the safety door is opened, the cam is operated to move the wire cable forward and backward. Due to this forward / backward movement, a stopper connected to the other end of the wire cable operates, and a hydraulic interlock, an electric interlock, or a mechanical interlock operates to stop the operation of the mold clamping device or the like.

Further, the safety door is provided on each of the operating side and the non-operating side, and a pair of cams is provided corresponding to each. A rod that integrally connects the pair of cams is provided. Therefore, the mold clamping safety device can be operated via the common rod regardless of whether the safety door on the operating side or the non-operating side is opened.

Further, since the return force of the wire cable is generated and the return spring for adjusting the stroke of the wire cable is provided, the return operation can be performed only by closing the safety door. Can be operated accurately.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a front view of a mold clamping safety device of an injection molding machine of the present invention,
FIG. 2 is an enlarged view of a cam mechanism of the mold clamping safety device of the injection molding machine of the present invention, FIG. 3 is a wire cable arrangement diagram of the mold clamping safety device of the injection molding machine of the present invention, and FIG. 4 is the present invention. FIG. 3 is an enlarged view of a mechanical stopper portion of the mold clamping safety device of the injection molding machine.

In FIG. 1, reference numeral 20 is a base plate 21, a movable platen that reciprocates along a tie bar 22, 24 is a safety door, and 26 is a cam mechanism for contacting an end surface of the safety door 24 to operate a mold clamping safety device. .

Wire cables 31 and 32 are connected to the cam mechanism 26, and when the safety door 24 is opened, the cam mechanism 26 pushes the wire cables 31 and 32 to operate the mold clamping safety device. ing. The wire cable 31 is connected to the cam operation switching valve 33, and the wire cable 32 is connected to the mechanical stopper.

When the wire cable 31 is pushed out by the cam mechanism 26, it operates to operate the hydraulic interlock. Reference numeral 34 is a return spring arranged to smoothly push out the wire cable 31.

The cam mechanism 26 has a cam 35 that comes into contact with the end surface of the safety door 24 and is driven thereby. As shown in FIG. 3, a pair of cams 35 are provided corresponding to the operation side safety door 24a and the counter operation side safety door 24b, and are connected via a rod 37. Therefore, even if any of the safety doors 24 is opened, the swing member 38 can be swung via the rod 37.

The swing member 38 is supported by a fulcrum 39,
Has 43. And the lever 43 is the wire cable 3
1, 32 and return spring 46 are connected. The return spring 46 is provided to return the mold clamping safety device when the safety door 24 is closed.

In FIG. 4, 51 is a shutter, and 52 is a mechanical stopper rod whose movement is restricted by the shutter 51. The mechanical stopper rod 52 is formed with a plurality of notches, and the shutter 51 is connected to the wire cable 32.
When is pushed, it is closed and the movement is restricted. Reference numeral 53 is a return spring, which is arranged to smoothly push out the wire cable 32.

In this way, the mold clamping safety device operates so that the safety door 24 on either the operating side or the non-operating side is opened.

If the wire cables 31, 32 are of PUSH-PULL type (for pushing and pulling), the return springs 34, 53 are unnecessary.

FIG. 5 is a view showing a second embodiment of the mold clamping safety device of the injection molding machine of the present invention.

In the figure, 61 is a dogleg-shaped cam that swings by opening and closing the safety door 24, 62 is a wire cable that operates by swinging of the cam 61, and 63 is a mold clamping safety device in which the safety door 24 is closed. It is a return spring provided for the return operation.

In this case, since the cam 61 is directly pushed by the safety door 24,
The structure is simplified.

The operation of the mold clamping safety device of the injection molding machine having the above configuration will be described.

When the operator opens the safety door 24, the cam 35 is pushed and the rod 37
And the swinging member 38 rotates. Then, the swing member 38
The wire cables 31 and 32 connected to are pulled by the return springs 34 and 53 to operate the interlocks.

When the operator closes the safety door 24, the wire cables 31 and 32 are returned to their original state by the force of the return springs 46 stronger than the return springs 34 and 53 of the respective devices, and the interlock is released.

The present invention is not limited to the above embodiment,
Various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

(Effect of the Invention) As described in detail above, according to the present invention, a cam that is disposed at the lower end of the safety door and that operates when the safety door is opened, and a cam that is connected to the cam. It has a wire cable that advances and retreats in response to operation, and a stopper that is connected to the other end of the wire cable and that operates as the wire cable advances and retracts.

Therefore, as the safety door is opened, the stopper connected to the other end of the wire cable can be operated, and the operation of the mold clamping device or the like can be stopped by the hydraulic interlock, the electric interlock, or the mechanical interlock. .

Further, the safety door is provided on each of the operating side and the non-operating side, and a pair of cams is provided corresponding to each. A rod that integrally connects the pair of cams is provided. Therefore, the mold clamping safety device can be operated via the common rod regardless of whether the safety door on the operating side or the non-operating side is opened.

Furthermore, since it has a return spring that generates the return force of the wire cable and adjusts the stroke of the wire cable, it is possible to perform the return operation simply by opening the safety door. The device can be operated accurately.

Since the mold clamping safety device is located below the safety door, the operator can easily take out the molded product without causing any danger. Moreover, it is not necessary to arrange piping for the hydraulic circuit near the safety door, and there is no risk of oil leakage.

[Brief description of drawings]

FIG. 1 is a front view of a mold clamping safety device of an injection molding machine of the present invention,
FIG. 2 is an enlarged view of a cam mechanism of the mold clamping safety device of the injection molding machine of the present invention, FIG. 3 is a wire cable arrangement diagram of the mold clamping safety device of the injection molding machine of the present invention, and FIG. 4 is the present invention. Enlarged view of mechanical stopper part of mold clamping safety device of injection molding machine, No. 5
FIG. 6 is a diagram showing a second embodiment of a mold clamping safety device for an injection molding machine of the present invention, FIG. 6 is a diagram showing an example of a conventional mechanical interlock, and FIG. 7 is a diagram showing a conventional mechanical interlock. FIG. 7 (A) is a front view of an interlock, and FIG. 7 (B) is a side view of an essential part of the interlock, showing another example. 20 …… base plate, 21 …… movable platen, 24 …… safety door, 31,32 …… wire cable, 33 …… cam operation switching valve, 34,46,53 …… return spring, 35 …… cam,
37 …… Rod.

Claims (3)

[Scope of utility model registration request] 1. A cam disposed on a lower end of a safety door and operated when the safety door is opened, and a wire which is connected to the cam and which advances and retreats in response to the operation of the cam. A mold clamping safety device for an injection molding machine, comprising: a cable; and (c) a stopper that is connected to the other end of the wire cable and that operates as the wire cable advances and retracts. 2. The safety door is provided on each of the operating side and the non-operating side, a pair of cams is provided corresponding to each, and a rod integrally connecting the pair of cams is provided. 1. A mold clamping safety device for an injection molding machine according to 1. 3. The mold clamping safety device for an injection molding machine according to claim 1, further comprising a return spring for generating a return force of the wire cable and adjusting a stroke of the wire cable.