JPH0731868Y2 - Vacuum pad - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention has a vacuum pad, particularly an automatic stop valve, used for adsorbing and carrying a plate material in a plate material processing machine such as a press. Regarding the vacuum pad.

(Prior Art) Conventionally, a vacuum pad that adsorbs and conveys a plate material has a detection rod built into the vacuum pad to detect the presence or absence of the plate material. It was configured to switch.

(Problems to be solved by the invention) By the way, such a conventional technique has a problem that when a plate member has a hole or a notch, the detection rod does not operate, and therefore the stop valve cannot be switched.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vacuum pump having an automatic stop valve which is simple in construction, reliable in operation, and easy to handle in order to solve the above problems.

[Structure of the Invention] (Means for Solving the Problem) In view of the conventional problems as described above, the present invention provides a vacuum pad for adsorbing a plate material, wherein a pad capable of adsorbing the plate material is attached to the lower portion of the cylindrical housing. A lower end block provided with a ventilation hole that communicates the inside of the housing with the inside of the pad is provided inside the housing, and a sealing portion is provided at a ventilation port provided at the top of the housing; The valve body installed in the housing is vertically movable between the seal portion and the lower end block, and air sucked from the vent hole of the lower end block to the vent hole when the pad is in an open state. The valve body is pressed against the lower surface of the seal portion by a flow to be adsorbed, and a plate-shaped material is adsorbed to the pad so that the pad is in a closed state. It is made of a substantially equal constituting pressure of the housing and the vent mouth through the hole.

[Action]

In the above structure, when the pad is in the open state without the plate material being adsorbed to the pad, a large amount of air flow sucked from the vent hole of the lower end block to the vent port presses and adsorbs the valve body on the lower surface of the seal portion. It is a composition. Therefore, when the plate material is not adsorbed on the pad, the pad is automatically closed by adhering the valve element to the seal portion.

Then, when the plate material W is adsorbed to the pad and the air flow becomes small, the pressure inside the vent hole becomes substantially equal to the pressure inside the housing through the small vertical through hole provided in the valve body. . Therefore, the valve body falls by its own weight without being adsorbed by the seal portion, and the seal portion is opened, so that the plate material can be surely adsorbed by the pad.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a sectional front view of an embodiment of the present invention. The vacuum pad 1 mainly includes a housing 3, a sealing member 5,
It is composed of a valve body 7, a lower end block 9, a pad 11 and the like. The housing 3 is formed in a hollow cylindrical shape having an upper end vent 13 and a lower end opening 15. The seal member 5 is fixed to the inlet of the upper end ventilation hole 13, and a pipe 17 connected to a vacuum pump (not shown) is connected to the upper end. A pad 11 is attached to the outer periphery of the lower end opening 15 so that the plate material W can be attracted thereto. The valve body 7 is formed in a columnar shape, is provided so as to be vertically movable inside the housing 3, and has a small through hole 19 in its axial center portion. Further, the lower end block 9 is fixed to the inner lower end portion of the housing 3, a ventilation hole 21 is provided in the central portion, and the vertical movement range of the valve body 7 is restricted between the seal member 5 and the lower end block 9, The proper opening / closing operation of the seal member 5 is maintained.

FIG. 1 shows a state in which a plate member W without a normal hole is adsorbed, the suction of the atmosphere is stopped by the plate member W, the valve body 7 is separated from the seal member 5, and the seal member 5 is opened.
When there is no plate material W or when there is a hole or a notch in the plate material W, the valve body 7 moves upward due to the sucked air and is adsorbed and closed by the seal member 5 to block the invasion of the air. . At this time, a small amount of air is sucked through the small through hole 19 of the valve body 7, so that the valve body 7 is easily separated from the seal member 5 when the plate material W having no hole or the like contacts the pad 11. Therefore, the valve body 7 again separates from the seal member 5, the seal member 5 is opened, and the normal plate material W is adsorbed.

Such a vacuum pad 1 has a reliable operation and is easy to handle despite the extremely simple structure having a stop valve function that automatically operates depending on the intake flow rate of the atmosphere.

It should be noted that the present invention is not limited to the above-described embodiment, but can be implemented in other aspects by making appropriate design changes.

[Effects of the Invention] As will be understood from the above description of the embodiments, the present invention is, in short, a vacuum pad for adsorbing a plate material (W), in which a pad (11) capable of adsorbing the plate material (W) is cylindrical. (21) provided in the lower part of the housing (3) for communicating the inside of the housing (3) with the inside of the pad (11).
A lower end block (9) provided with the housing (3)
A seal part (5) is provided inside the housing (3) at the vent (13) part provided on the upper part of the housing (3), and the valve body (7) housed in the housing (3) is attached to the seal part. It is provided between the lower end block (9) and the lower end block (9) so as to be vertically movable, and when the pad (11) is in an open state, the lower end block (9) has a vent hole (21) through the vent hole (21). 1
The valve body (7) is pressed and adsorbed on the lower surface of the seal portion (5) by the air flow sucked by 3), and the plate material (W) is adsorbed by the pad (11) to cause the pad (11). When the valve is closed, the pressure in the vent hole (13) and the pressure in the housing (3) are made substantially equal via a small vertical through hole (19) provided in the valve body (7). It will be.

As is apparent from the above configuration, in the present invention, when the pad 11 is in the open state without the plate material W being adsorbed by the pad 11, the vent hole 21 through the vent hole of the lower end block 9 is used.
Since the valve body 7 is pressed against the lower surface of the seal portion 5 and adsorbed by a large amount of air flow that is sucked into the pad 13, when the plate material W is not adsorbed on the pad 11, the pad 11 will not
By being adsorbed by the seal portion 5, it is automatically closed.

Then, when the plate material W is adsorbed to the pad 11 and the air flow is reduced, the inside of the vent hole 13 and the housing 3 are passed through the small vertical through holes 19 provided in the valve body 7.
Since the internal pressures of the valves are almost equal, the valve body 7 falls by its own weight without being adsorbed by the seal portion 5, and the seal portion 5 is opened, so that the plate material W is securely adsorbed by the pad 11. Is something that can be done.

That is, according to the present invention, when the plate material W is not adsorbed on the pad 11, the pad 11 is automatically closed by the action of the valve body 7, and when the plate material W is adsorbed on the pad 11, the valve body 7 is self-weighted. Plate material W dropped by the pad 11
This will ensure the adsorption of.

[Brief description of drawings]

 FIG. 1 is a sectional front view of an embodiment of the present invention. 1 ... Vacuum pad, 3 ... Housing 5 ... Seal member, 7 ... Valve element 9 ... Lower end block, 11 ... Pat 19 ... Small through hole, W ... Plate material

Claims (1)

[Scope of utility model registration request] 1. A vacuum pad for adsorbing a plate material (W), wherein a pad (11) capable of adsorbing the plate material (W) is provided in a lower portion of a cylindrical housing (3), and inside and front of this housing (3). A lower end block (9) having a ventilation hole (21) communicating with the inside of the pad (11) is provided inside the housing (3), and a ventilation port (13) provided above the housing (3). A seal portion (5) is provided in the portion (3), and a valve element (7) installed in the housing (3) is provided between the seal portion (5) and the lower end block (9) so as to be vertically movable. , The seal portion (5) by the air flow sucked from the vent hole (21) of the lower end block (9) to the vent hole (13) when the pad (11) is in an open state
When the pad (11) is in a closed state by pressing the valve body (7) to the lower surface of the pad and adsorbing the valve body (7) to the valve body (7). A vacuum pad characterized in that the pressure in the vent hole (13) and the pressure in the housing (3) are made substantially equal via a small vertical through hole (19) provided.