JPS602396Y2 - Lifting device for safety guard in press machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a lifting device for a safety guard in a press machine, particularly a movable gusset bolster. The press work is done at the front of the safety guard, and the lower mold preparation work is done at the rear.The movable bolster is set within the danger limit of the press machine, and the safety guard is placed within the danger limit before the start of the press stroke. In a press machine configured to lower and shield the limit surface, and after the end of the press stroke, the safety guard raises and releases the danger limit surface to move the lower die outside the danger limit of the press machine and perform preparatory work. Concerning a safety guard lifting device.

In recent years, press machines have been equipped with movable bolsters to move the molds attached to the bolsters out of the danger limits of the press, where workpieces can be attached and removed. A movable gusset bolster with excellent safety that does not require insertion has been developed.

This type of press is preferable because it is extremely safe for workers, but because the press work is carried out with the critical surface of the press open, there is a risk of accidents caused by scattering of pieces of the workpiece during work. It is difficult to say that it is completely safe in terms of safety for workers.

The present invention provides a lifting device for a safety guard in the above-mentioned movable gusset bolster for the purpose of double safety for press operators.

The purpose of the present invention is to provide a lifting device for a safety guard in a press machine, in which the safety guard quickly moves the dangerous boundary surface by following the advance or retreat of a movable bolster, and reliably opens the raised part or shields the lowered part. It is in.

Another purpose of the present invention is to apply a link mechanism to a lifting device for a safety guard that is activated by moving the movable bolster forward or backward, and to make it possible to move the safety guard slightly in the opposite direction to the direction of movement of the link. It is an object of the present invention to provide a lifting device for a safety guard in a press machine, which reduces impact when shielding the safety guard and protects links from breakage and breakage.

Preferred examples of the present invention will be described below based on the drawings.

FIG. 2 shows an embodiment of the present invention, and symmetrical parts are omitted from the illustration.

Reference numeral 1 denotes a base bolter, and the base bolster 1 is composed of a rectangular sliding guide receiving part 2 and a fixed part 3 integrally formed and projecting from both sides of the lower end of the guide receiving part 2. Guide rail grooves 4 are provided on both sides of the guide receiving part 2.

The base bolster 1 is fixed to the base of the press machine at the fixing part 3.

Reference numeral 5 denotes a movable bolster, and on both sides of the movable bolster 5 there are formed hook portions 6 that bend inward.

The movable bolster 5 is arranged at the side hook portion 6 so as to be engaged with the guide rail groove 4 of the base bolster so as to be able to reciprocate and slide on the base bolster 1 along the rail groove.

7 is a lower mold installed on the movable bolster 5.

8 is a drive cylinder fixed to the fixed part 3 of the pace bolster 1.

Reference numeral 9 denotes a piston rod of the drive cylinder 8, and a support fitting 10 is fixed to the protruding end of the rod.

The support fitting 10 is connected to the movable bolster 5 at the side surface of the tip of the movable bolster 5.

In the above configuration, the piston rod 9 protrudes due to the operation of the drive cylinder 8, and the movable bolster 5 engages its side hook portion 6 with the side guide rail groove 4 of the base bolster 1, and the movable bolster 5 engages with the side guide rail groove 4 of the base bolster 1. Base bolster along
1. Slide back and forth (forward, backward).

Reference numeral 11 denotes a pair of pillars fixed oppositely to each other on both sides of the distal end of the fixed portion of the pace bolster 1, and the pillars 11 are fastened and fixed by lock nuts 12.

13 C is a drive link rod, and a hook portion 14 is formed at one end of the drive link rod 13 by bending it into an acute angle.

The drive link rod 13 is rotatably attached to the column 11 at a bent portion 14' by a pivot pin 15, and the hook portion 14 is oriented in a direction intersecting the piston rod axis. ing.

Reference numeral 16 denotes a support link rod located above and parallel to the drive link rod 13, and one end of the support link rod 16 is rotatable by a pivot pin 17 on the support column 11. is supported by.

18 is a connecting member provided by connecting the other ends of the driving link rod 13 and the supporting link rod 16, and the driving link rod and the supporting link rod are connected to the connecting member 18 with pins 19.2.
It is rotatably attached by 0.

21 is a coil spring whose one end is fixed near the center of the drive link rod 13 and the other end is fixed near the upper end of the support column 11;
A spring force is applied to pull 3 upward.

In other words, the drive link rod 13 is suspended upwardly by the coil spring 21.

22 is a safety guard plate attached to the connecting member 18 so as to cover the space between the connecting members 18.

Reference numeral 23 denotes a shock absorber provided at the lower end of the safety guard plate 22.

A groove 24 is formed in the shock absorber 23, and the lower end of the safety guard plate 22 fits into the groove 24.

25 is a holder fixed to one side of the shock absorber 23.

Reference numeral 26 denotes an engagement tool fixed to one side of the safety guard 22 facing the holder 25, and a device is provided between the engagement tool 26 and the holder 25 so as to press the holder 25 downward at all times. A coil spring 27 biased with spring force is arranged.

28 is a guide rod for the coil spring 27;
One end is fixed to a holder 25 fixed to the buffer receiver 23, and the other end is an engagement tool 2 fixed to the safety guard plate 22.
6, and a flange 29 is formed at the end thereof.

The guide rod 28 also acts as a connecting member between the holder 25 and the engagement member 26.

Reference numeral 30 denotes a buffer material made of a rubber elastic body attached to the lower end of the buffer receiver 23.

In the above-described configuration, when the safety guard plate 22 moves downward, the safety guard plate 2 comes into contact with the upper surface of the movable bolster 5 via the buffer material 30 and the buffer receiver 23.

The impact force at this time is due to the elasticity of the buffer material 30 and the shock absorber 2.
3 is relieved by fitting the safety guard plate 22 into the groove against the spring force of the coil spring 27 and moving upward.

31 is an upper mold attached to the Goui plate 32.

FIG. 6 shows another embodiment of the support 11, in which the support can be adjusted according to the height of the press machine.

That is, the shaft bolt 33 is fixed to the fixing part 3 of the base plate 1, and the support 11 is provided with a hole 34 in the longitudinal direction of the support.
The shaft portion of the bolt 33 with a shaft is fitted into the hole and held in a predetermined position with a lock nut 35 and a bolt 36.

Next, the operating state of the safety guard of the present invention will be explained.

The situation shown in FIG. 1 (i.e. the movable bolster 5 is located outside the critical limits of the press).

), the actuation of the drive cylinder 8 causes the piston rod 9 to protrude from the cylinder 8 and simultaneously the piston.

The movable bolster 5 connected to the support fitting 10 fixed to the rod 9 fits its side hook portion 6 into the side guide rail groove 4 of the base bolster 1 and moves forward along the groove 4.

At the end of the forward movement of the movable bolster 5, the support fitting 10 fixed to the Viniston rod 9 is connected to the drive link rod 13.
The driving link rod 13, which is rotatably attached to the support column 11 by a pivot pin 15, is rotated about the pivot pin 15 as a fulcrum.

The drive link rod 13 rotates against the spring force of a coil spring 21 that suspends and supports the drive link rod 13, and the connecting member 1 connects the drive link rod 13 and the support link rod 16.
A safety guard plate 22 installed between the presses 8 and 8 shields the critical surface of the press.

4 (FIG. 3) Then, the pressing operation is performed in this state.

In shielding the safety guard plate 22, the safety guard plate 22 is provided with a shock absorber 2 attached to the lower end of the guard plate 22.
3, the movable bolster 5 comes into contact with the shock absorber 23, the coil spring 27, and the shock absorber 30.

After the press operation, the piston rod 9 plunges into the cylinder by the actuation of the drive cylinder 8, and at the same time the movable bolster 5 connected to the support fitting 10 fixed to the piston rod 9 retreats, and the support fitting 10 of the biston rod is moved back.
The contact between the drive link rod 13 and the hook portion 14 is released.

Then, the driving link rod 13 is pulled upward by the coil spring 16, and the safety guard plate 22 is also pulled upward, so that the danger limit 7 surface of the press is released, and the movable bolster 5 is mounted on the movable bolster 5. The lower mold 7 retreats out of the danger limit.

The lifting device for the safety guard in the press machine of the present invention is configured so that the safety guard moves up or down in accordance with the movement of the movable bolster.
There is no risk of colliding with a safety guard that is rising or falling when moving forward or backward within the press machine body, and the critical surface can be quickly and reliably shielded.

In addition, the lower end of the safety guard is loosely fitted into the recessed groove of the shock absorber, and the shock absorber is supported by a coil spring, so it is configured to be able to move slightly in the opposite direction to the direction of movement of the link. This has the effect of alleviating the impact when shielding the guard and protecting the links from damage and breakage.

[Brief explanation of drawings]

Fig. 1 is a side view of the lifting device for the safety guard in the press machine of the present invention, Fig. 2 is a symmetrical front view of the section A-A in Fig. 1, and Fig. 3 is the main part of the safety guard when it is lowered. FIG. 4 is a side view, FIG. 4 is a rear view of the buffer mechanism portion of the safety guard, FIG. 5 is a sectional view taken along line BB in FIG. 4, and FIG. . 1: Base bolster - 5: Movable bolster - 18: Drive cylinder, 10: Support metal fittings, 11: Support, 13: Drive link rod, 16: Support link rod, 21: Coil spring, 22:
Safety guard board.

Claims (1)

[Scope of utility model registration request] A movable bolster connected to the piston rod of a drive cylinder fixed to the base bolster is arranged on the base bolster so as to be able to slide back and forth, and a pair of movable bolsters are provided on both sides of the tip of the base bolster. Supports are fixed to face each other, and a drive link rod having a hook portion at one end is rotatably supported at the bent portion of the support, and the hook portion is aligned with the axis of the piston rod. A support link rod is rotatably supported above and parallel to the drive link rod, and the other ends of the drive link rod and the support link rod are connected to each other. The drive link rod is rotatably supported by the member, and the drive link rod is suspended by a coil spring fixed at one end to the drive link rod and at the other end to the column, and the connecting member has a safety A lifting device for a safety guard in a press machine that is equipped with a guard plate.