JPS5881139A - Safety device of clamping apparatus - Google Patents

Abstract

PURPOSE:To provide a safety device wherein an erroneous operation hardly occur, by providing a stopper movably attached on the side of a fixed plate for stopping clamping operation and a pair of cams that will be positions in the operating position through respective link mechanisms by closing a front and a back safety door. CONSTITUTION:In the clamping apparatus having the front safety door 4 and the back safety door 5 positioned opposite sides of a movable plate 2 and movable together with the movable plate 2 toward the fixed plate 1, a safety rod 6 is detachably projected from a rod retainer 7 of the movable plate 2, and the stopper arranged to the fixed plate 1 can be engaged with a cone nut 8 threaded on the tip of the safety rod 6 thereby preventing the cone nut 8 and therefore the movable plate 2 from moving to effect the safety function. This engagement and disengagement of the stopper 11 with the cone nut 8 is carried out by the cams 16, 22 and the link mechanisms 4a, 4b that will be operated by opening and closing of the front and back safety doors 4, 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety device in a mold clamping device for an injection molding machine, a die casting machine, etc.

Conventionally, the above-mentioned mold clamping device is equipped with a safety device to prevent the worker from getting pinched by the amount of metal during operation, and generally a safety device is installed on the operating side of the mold clamping device. A door is installed, and the hydraulic or electrical interlock is installed so that the mold clamping operation will not be performed unless the safety door is closed. However, with this safety device, even though the safety door is open, the hydraulic
Failure of the electrical system (There is always a danger that the moving plate side will move forward, and absolute safety cannot be guaranteed.Therefore, conventional methods have been used to ensure safety even in the unlikely event of a malfunction in the hydraulic system or electrical system. Various safety devices have been developed to ensure safety, but each has advantages and disadvantages, and it is difficult to say that they are ideal.

On the other hand, a dedicated safety device is also installed on the front safety door used for work such as attaching/detaching and adjusting mold cooling piping, electrical components, etc., but it is usually the same safety device as the front safety door. Because they are installed side by side, the cost is high, and even if both safety devices are configured as mechanical safety devices, they are connected electrically or hydraulically, so it is the same as above. There is no security in the unlikely event that a malfunction occurs in the electrical or hydraulic system.

The present invention aims to eliminate the above-mentioned drawbacks in the safety devices of conventional mold clamping devices. It consists of a stopper/ξ that stops the operation, and a pair of cams that are installed opposite to the stopper, each of which becomes an operating position via a link mechanism when the light and nest safety door is closed. The feature is that the stopper is moved to the inoperative position that enables the mold clamping operation only when the two cams are in the activated position by closing the door, and the seventh objective is simple. The purpose of the present invention is to provide a safety device for a mold clamping device that can be reliably placed in a stopper, non-operating position only when the front and back safety doors are closed.

The present invention has the above-described structure, and when the front/agricultural safety door is closed, each of the four cams is mechanically always in an accurate operating position via a link mechanism, and both of the cams are Only when both of them are in the operating position, the stop horn ξ, which is in the operating position where the mold clamping operation is stopped, is moved to the non-operating position where the mold clamping operation is mechanically enabled by the two cams, so the safety device is activated. The safety of operations such as removing molded products, arranging mold cooling water pipes, and attaching/detaching/adjusting electrical components etc. is ensured without causing malfunctions.

Furthermore, in the present invention, a pair of cams are provided on the front and rear safety doors, respectively, which are operated via a link mechanism.
Since the pair of cams are configured to work together to drive the stopper, the actuation mechanism is extremely simplified and the drive of the stopper ξ is extremely simplified, even though the front and rear safety doors are related. (operates accurately and smoothly.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 and FIG. 2 show an embodiment of the present invention, (1) in the figure.
is a fixed plate on the main body side, (2) is a movable plate that reciprocates in the direction of the arrow when the mold is clamped, and (3) is the tie rod 9, which connects the front safety door (4) and the back that are opened and closed in the direction of the arrow. Safety # (5) is installed.

Furthermore, a safety rod (6) is removably protruded from the rod retainer (7) disposed on the movable plate (2) in the direction of reciprocating motion of the movable plate (2). The part of the cone nut (8) screwed onto the tip side of the movable plate (21)
The reciprocating movement of the fixing plate causes it to move in and out of a hole QIK provided in a stopper block (9) disposed above it.

Furthermore, a stopper aD is pivotally attached to the bracket (121) provided on the stopper block (91), and the stopper aD is pivotally connected to the balance way portion (ll) on the base side.
The distal plate (lla) on the distal end side is supported so as to be slightly heavier than b), and the cone nut (8) is in the lowered position, that is, the operating position shown in the second decoy. The moving path is blocked and the moving plate (2) is prevented from moving to the right to stop the mold clamping operation, and a pair of cams (to be described later) cause the interference plate portion (1'la') to move as shown in FIG. The cone nut (8) is moved above the mold clamping operation, that is, the cone nut (8) is moved to the top of the hole 01 of the Z-lub (9).
The structure allows access inside and out.

Next, the structure in which the stopper aD is moved from the operating position shown in FIG. 2 to the inoperative position shown in FIG. 1 by closing the front safety door (4) is to The front cam Q61 is raised to the operating position via (4a), and the link mechanism (5) is closed by closing the back safety door (5).
1 of the cam @ on the back side which is raised through a) and becomes the operating position.
A cam floor a4 and a roller are swingably mounted vertically from a stopper aυ that is raised by both cams αG when the pair of cams Q61 and (c) are both raised to the operating position. (14a).

A more detailed explanation of the two cams ae and their driving link mechanisms (4), (5a),
Both cams (161(2) are the transverse U-shaped guys P (shown with two-dot chain lines) disposed on the main body side, that is, the fixing plate (11 side).
The rollers of the cam floor I (14
a) The link mechanism (4a) that is arranged to push up Ik and that drives the front cam is attached to the fixed plate +11
m platen) (211 [One end of the bell crank a9 which is pivotably mounted is pivoted to the lower end of the Rondo C171 which is protruded from the lower side of the cam Q6), and the other end of the bell crank a value The roller ■ mounted on the side faces the closing movement path of the front safety door (4), and the link mechanism (5a) that drives the cam on the back side is rotatable with a fixed plate (IIK bearing @). An arm (C) is fixedly attached to both ends of the shaft (C) mounted on the shaft, and a cam c!2 is attached at the tip of the arm (C).
It is pivoted to the lower end of a rod (c) protruding from the bottom of the arm, and has a roller (to) attached to the tip of the arm facing the closing movement path of the rear safety door (5).

The illustrated embodiment has the structure described above, so as shown in FIG.
5) are both "closed", the roller handle is moved in the direction of the solid line arrow at the front safety door (4), and the bell crank (1) is closed.
10 Rotate counterclockwise to rotate the rod 01 through cam (16
1 is raised to the operating position, and the back safety door (5)
The roller (support) is moved in the direction of the solid line arrow, and the arm @
The intermediate shaft (C) rotates and the tip side of the arm (C) rises, and the rod @Nasal cam@ is similarly raised to the operating position, so that the slopes of the supernatant of both opposing cams a6112' and a At (16a) and (22a), the roller (14a) is raised and the stopper αB is moved upward via the cam floor u4J. Namely, Stone, IQ 11 Jama Itabe (lla)
is a corn nut (upper 11i1 of 81) as shown in Figure 1.
The mold moves to the inactive state where mold clamping operation is possible.

Therefore, in the above-mentioned state, the cone nut (8) screwed onto the tip side of the safety rod (6) can move in and out of the strut knob block (910 hole 01) without being obstructed by the strut horn eQl. (2) can freely reciprocate, and the closing and opening operations of the mold (not shown) inside the front and back safety doors (41 (51) are performed.

On the other hand, when the front safety door (4) is open, the cam 〇〇 is in the lowered position as shown in Fig. 2, so that the roller (14a) attached to the lower end of the cam floor α4 is ) Guided by K on the slope of cam a61 (16a)
I started to ride on top of it, and the jama plate part (ll) of Stotsuno Qll
a) is lowered and placed on the movement path of the cone nut (81) and becomes the operating position (due to the stopper's own weight).
Contrary to the above, when only the back safety door (5) is open, the jamb plate (lla) similarly descends to the operating position, and then the front and back safety doors (41 (51) are both opened). When the
(When one or both of the movable plates 51 are open, the jamming plate part (lla) of the stopper Qll is always located on the movement path of the cone nut (8), and the movement of the movable plate (21) causes the mold clamping operation. will be stopped.

When displaying the operational relationship of the front safety door (4), back safety door (5), cam αe, cam@, stone-zoo αB, and moving plate (2), the table above shows the front and rear safety doors. Only when both the safety doors (41 (51) are closed, the stopper αB rises to the inactive position, the movable plate (2) can move forward, the mold clamping operation is performed, and the front and back safety doors (41 (51) When one or both are open, the strut aB, that is, the jamb plate part (11a,)
is lowered to the operating position, the movement of the movable plate (2) is stopped, and the mold clamping operation is stopped.

Therefore, according to the embodiment described above, the safety device is always accurately driven only by the interlocking mechanical mechanism when the front and rear safety doors are closed, and no malfunction occurs. In addition, a pair of cams are activated via a link mechanism that is activated when the front and rear safety doors are closed, and the stopper is driven by the pair of cams, so there is no possibility of malfunction. It becomes an extremely simple mechanism and can drive the stone and e accurately and smoothly.

In the above-mentioned embodiment, it is possible to arrange the safety rod, stopper, cam, stop horn wall block, etc. on the back safety door side, and the structure of the safety rod, cone nut, stop horn, etc. can also be the same as in the above embodiment. In addition to this, various other design changes are possible.

Although the embodiments of the present invention have been described above, it goes without saying that the present invention is not limited to these embodiments, and that various design modifications can be made without departing from the spirit of the present invention. be.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
It is an operation explanatory diagram as viewed from the arrow in the figure. 1: Fixed plate 2: Moving plate 6: Tie rod 4: Front safety door 4a: Front safety door side link machine $ 5: Back safety door 5a
: Link mechanism of the back safety door 6: Safety rod 8: Corn nut 10: Hole 11: Stopper 11a: Jama plate part 16.22: Cam sub-agent Patent attorney 2 persons outside of Kaimoto important literature

Claims (1)

[Claims] In a mold clamping device that has front and front safety doors, a stopper that stops the mold clamping operation is movably attached to the fixed plate side, and when the front and back safety doors are closed, they are brought to the operating position through a link mechanism. a pair of cams installed opposite to the stopper, and an inoperative position in which the stopper enables the mold clamping operation when both the cams are in the activated position due to the closure of the front safety door and the front safety door; A safety device for a mold clamping device characterized in that it is configured to be moved.