JPH0647673Y2 - Vacuum pressure buffer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a buffer for use in vacuum pressure equipment such as a suction pad.

[Prior Art] When a work is sucked and moved by a suction pad, the suction pad is attached to a piston rod of a fluid pressure cylinder that drives the pad toward the work. In this case, if the suction pad is directly attached to the piston rod, the thrust of the fluid pressure cylinder is transmitted to the work as it is, so it is necessary to provide a buffer between the piston rod and the suction pad.

If vacuum pressure is applied from a direction orthogonal to the drive direction of the suction pad, the vacuum pressure pipe near the suction pad interferes with the work, so the suction pad is connected to the suction pad via the flow path provided in the piston rod. It is desirable to apply a vacuum pressure.

However, when a buffer utilizing the biasing force of the spring is provided between the piston rod and the suction pad, if vacuum pressure is applied to the suction pad via the flow path of the piston rod, the vacuum pressure also acts on the buffer. Therefore, there is a problem that the buffer function of the buffer is lost because the spring is compressed by the suction force of the vacuum pressure.

[Problems to be Solved by the Invention] An object of the present invention is to provide a vacuum pressure buffer having a buffering function even when suction force by vacuum pressure acts.

[Means for Solving the Problems] In order to solve the above problems, a vacuum buffer of the present invention includes a hollow body, a head cover and a bush fixed to the end of the body, and an axial slide on the bush. A vacuum pressure buffer with a rod mounted as possible,
The head cover has an axial suction flow path and a piston rod mounting portion for mounting a hollow piston rod at the suction flow path end, and the rod has an axial suction flow path and A seal sliding portion having a small diameter that slides in the suction passage of the head cover, and a spring for separating the rod from the head cover is contracted in the space between the body and the rod, and the suction passage of the head cover is provided. Between the rod and the seal sliding portion of the rod, a rod packing for sealing the space provided with the spring is provided.

[Operation] When the hollow piston rod of the fluid pressure cylinder is attached to the piston rod attachment portion of the head cover, the vacuum pressure buffer can be moved by the fluid pressure cylinder, and the suction passage of the buffer has the passage of the piston rod. Vacuum pressure acts through the.

In this case, even if the vacuum pressure acts on the suction flow path provided on the rod of the buffer and the head cover, the space provided with the spring is
Since the space between the seal sliding portion of the rod and the suction passage of the head cover is sealed by the rod packing, the suction force due to the vacuum pressure does not act on this space. Further, since the diameter of the seal sliding portion is made smaller than the diameter of the rod to reduce the pressure receiving area of the vacuum pressure acting on the rod, the suction force acting on the rod is reduced.

Therefore, the cushioning function using the biasing force of the spring is not hindered, and the biasing force of the spring can be reduced.

[Embodiment] FIG. 1 shows a first embodiment of the present invention.
Is directly attached to the hollow piston rod 2 of the fluid pressure cylinder, and the piston rod 2 has an axial flow path 2a for applying a vacuum pressure to the suction pad 3.

The hollow body 5 of the buffer 1 has a head cover 6 and a bush 7 which are caulked at the ends thereof. The head cover 6 has an axial suction passage 9 and a tip of the piston rod 2 at the end of the suction passage. The bush 7 has a hexagonal sliding hole 7a having a diameter larger than that of the suction flow passage 9 described above.

A rod that is slidably inserted into the sliding hole 7a and cannot be rotated.
10 is a small-diameter seal sliding portion 10a that slides in the suction passage 9.
And a suction pad mounting flange 10b formed at the tip of a small diameter portion protruding from the bush 7, and an axial suction passage 10c.
The seal sliding portion 10a and the suction passage 9 are hermetically sealed by a rod packing 11 provided on the cover 6.

A stopper 13 is attached to the outer periphery of the base of the seal sliding portion 10a of the rod 10 via a damper 12 formed of an elastic material such as soft synthetic resin, and slides on the outer periphery of the tip of the stopper 13 and the seal sliding portion 10a. A spring 15 that separates the rod 10 from the head cover 6 is contracted between the movable spring seat 14 and the spring seat 14. Therefore, the vacuum pressure of the suction passages 9 and 10c does not act on the space 16 provided with the spring 15.

In the buffer 1, even if the vacuum pressure acts on the suction flow passages 9 and 10c of the head cover 6 and the rod 10, the seal packing 11 between the suction flow passage 9 and the seal sliding portion 10a causes the spring 1 to move.
Since the vacuum pressure does not act on the space 16 provided with 5, the spring 15 is not compressed by the suction force of the vacuum pressure. Therefore, the biasing force of the spring 15 can be reduced.

Further, since the seal sliding portion 10a has a smaller diameter than the rod 10 and the pressure receiving area on the head cover side of the rod 10 is small, the suction force of the rod 10 due to the vacuum pressure is small, so that the force acting on the spring 15 is small. Therefore, the biasing force of the spring 15 can also be reduced.

When the suction pad 3 comes into contact with the work, the rod 10 moves the spring 15
Since it slides toward the head cover 6 side against the urging force of, the thrust of the fluid pressure cylinder that drives the suction pad 3 can be prevented from being directly transmitted to the work, and there is a slight difference in the stroke of the piston rod 2. Can also be absorbed.

When the thrust of the fluid pressure cylinder is released, the rod 10 returns to its original position by the urging force of the spring 15, and the damper 12 reduces the impact of the rod 10 and the bush 7.

The buffer 1 can be moved by the fluid pressure cylinder by attaching the hollow piston rod 2 of the fluid pressure cylinder to the female screw 9a of the head cover 6, and the suction can be performed via the passage 2a of the piston rod 2. Channel 9,
Since vacuum pressure is applied to 10c, the buffer 1 can be made slim and compact.

FIG. 2 shows a second embodiment of the present invention. A head cover 22 in this buffer 21 includes a female screw 22a to which a piston rod having a flow passage is screwed, and a step portion 2 facing the stopper 13.
2b is provided, and the spring 15 is contracted between the stopper 13 and the step portion 22b.

Further, the rod 10 is provided with a male screw 24 for screwing a suction pad instead of the flange 10b, and the suction pad screwed to the male screw 24 is fixed by a seal washer 25 and a tip nut 26.

Since the other structure and operation of the second embodiment are the same as those of the first embodiment, the same parts as those in the figure are designated by the same reference numerals and detailed description thereof will be omitted.

[Advantage of the Invention] The vacuum pressure buffer of the present invention buffers the space provided with the spring for separating the rod from the head cover by the rod packing provided between the seal sliding part of the rod and the suction passage of the head cover. Since the spring is not compressed by the suction force of the vacuum pressure that acts on the suction flow path, the buffer function can be exerted even when the vacuum pressure acts on the suction flow path. The biasing force of can be reduced.

Further, by providing the piston rod mounting portion of the fluid pressure cylinder in the suction passage of the head cover, the buffer can be driven by the fluid pressure cylinder, and the suction passage can be driven through the piston rod of the fluid pressure cylinder. Since the vacuum pressure is applied to the vacuum pressure buffer, the vacuum pressure buffer can be made slim and compact.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a half portion of a first embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of a half portion of the second embodiment. 1,21 ... Buffer, 5 ... Body, 6,22 ... Head cover, 7 ... Bush, 9,10c ... Suction channel, 9a, 22a ...
Female thread, 10 …… rod, 10a …… seal sliding part, 11 ……
Rod packing, 15 ... Spring.

Claims (1)

[Scope of utility model registration request] 1. A vacuum pressure buffer comprising a hollow body, a head cover and a bush fixed to an end portion of the body, and a rod slidably mounted on the bush in the axial direction. A suction flow channel in the axial direction and a piston rod mounting portion for mounting a hollow piston rod at the end of the suction flow channel, wherein the rod has an axial suction flow channel and a diameter smaller than that of the rod. A seal sliding portion that slides in the suction flow passage of the head cover, and a spring for separating the rod from the head cover is contracted in the space between the body and the rod, and the suction flow passage of the head cover and the rod A vacuum packing buffer, characterized in that a rod packing for sealing the space provided with the spring is provided between the seal sliding portion and the seal sliding portion.