JPH0747658Y2 - Mechanical valve - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a mechanical valve used for switching a positive pressure and a negative pressure to a vacuum suction pad.

[0002]

2. Description of the Related Art In a production line, a vacuum suction pad for sucking and transferring, carrying, mounting, etc. parts is usually connected by switching between a negative pressure source for generating vacuum and a pressure source for breaking vacuum. It In order to switch such flow paths, mechanical valves that reliably switch between negative pressure and positive pressure are often used.In that case, in order to operate many vacuum suction pads, many mechanical valves are connected in parallel. Set up,
The actuators are operated at the same time or at a predetermined timing. This mechanical valve alternately strikes two switching roller levers at opposite positions with a dog located between them.
The operating position of the dog is fixed.

However, the switching points in the mechanical valves that have been conventionally used have a relatively large variation depending on the product, so that the suction timings of the suction pads are different from each other. This trend is
Especially when the tact becomes shorter. And it takes man-hours to adjust all of the many valves without variation,
There is a problem that it is very difficult, and therefore it takes a lot of time and effort to adjust the valve when assembling. In addition, improving the precision of the valve component processing itself involves technical difficulties and makes the valve very expensive.

[0004]

The technical problem to be solved by the present invention is to provide an adjusting mechanism which can be easily adjusted from the outside on the mechanical valve itself so that the variation of the switching points of the valve bodies for each product can be easily eliminated. Moreover, it is intended to obtain a mechanical valve whose adjustment portion does not easily move due to contact with another object.

[0005]

A mechanical valve of the present invention for solving the above-mentioned problems is constructed such that a valve body for switching an output flow passage between a negative pressure and a positive pressure is slid in an axial direction inside the valve body. A roller lever that accommodates as much as possible and switches the flow path by mechanically pressing the valve body by abutting the dog to the roller at both ends of this valve body, projecting the roller to the side surface side of the valve body. Each of the roller levers has its tip facing the end of the valve body and its base end protruding outward from the end face of the valve body by screwing it in and fixing it with a lock nut. Then, the elastic cap is attached to the base end portion of the adjusting screw and the lock nut protruding outward from both ends of the valve body.

[0006]

[Operation] Since the adjusting screws whose base ends project to the outside are screwed into the roller levers pivotally attached to both ends of the valve body, the amount of projection is adjusted by operating the base ends of the adjusting screws from the outside. By doing so, the switching point of the valve element can be adjusted, and the adjustment can eliminate the variation in the switching point of the valve element for each product. Therefore, it is possible to prevent the suction timings of the suction pads operating by switching the valves from being shifted from each other. Making the adjusting mechanism consisting of the adjusting screw and the lock nut adjustable from the outside reduces the number of adjusting steps, facilitates the adjustment, and eliminates the need for highly accurate machining of valve parts.

Further, since the adjusting screw and the lock nut are projected to the outside from the end of the valve body, the adjustment is easy with a simple structure, but the adjusting portion is easily displaced due to contact with another object. Although there is a possibility of movement, since the elastic cap is attached to the base end of the adjustment screw and the lock nut, the displacement of the adjustment screw and the lock nut is suppressed, and at the same time, the cushioning action at the time of contact with other objects is there.

[0008]

1 shows an embodiment of a mechanical valve according to the present invention. This mechanical valve includes a valve body 1, a negative pressure port 2 connected to a negative pressure source, a positive pressure port 3 connected to a positive pressure source, and an output port 4 connected to an output passage to an adsorption pad. A valve body 5 for switching the output flow path to the negative pressure port 2 and the positive pressure port 3 for communication is provided inside the body 1 so as to be slidable in the axial direction. The valve body 5 includes a push rod 7 which is in contact with a spool portion 6 and an end surface thereof and whose sliding is guided by a bush 8.
It is composed of

At both ends of the valve body 1, roller levers 9 for mechanically pressing the valve body 5 to switch the flow path are pivotally attached by pins 10. This roller lever 9
The flow path is switched by pressing the valve body 5, and the roller 9a, which is brought into contact with a dog (not shown), is projected to the side surface side facing position of the valve body 1. An adjusting screw 11 is screwed into each of the roller levers 9 so that the front end faces the end surface of the push rod 7 of the valve body 5 and the base end projects outward from the end surface of the valve body 1.

The adjusting screw 11 is fixed so as not to be loosened by the screw insertion of the lock nut 12, and is fixed to the base end portion of the adjusting screw 11 and the lock nut 12 protruding from both end surfaces of the valve body 1. Is covered with an elastic cap 13 made of rubber or the like. A spring 14 is held between the pair of roller levers 9 to hold them in the return position.

In the mechanical valve having the above structure, generally, the negative pressure port 2 is connected to a negative pressure source (vacuum source) and the positive pressure port 3 is connected to a positive pressure source (compressed air source), and a vacuum suction pad is used. Is used by connecting the output port 4 to the output port 4, and one of the rollers 9a of the pair of roller levers 9 is pressed by one of the rollers 9a to drive the valve body 5 to drive the negative pressure port 2 or the positive pressure port 2. The pressure port 3 is communicated with the output port 4 so that the suction pad connected to the output port performs the necessary operation.

When installing a large number of such mechanical valves, adjustment screws 11 are screwed into each of the roller levers 9 pivotally attached to both ends of the valve body 1 so that the base ends thereof project outward. By adjusting the protruding amount by operating the base end of the adjusting screw 11 from the outside, the switching point of the valve body 5 is adjusted, and the adjustment eliminates the variation of the switching point of the valve body 5 for each product. You can Therefore, it is possible to prevent the suction timings of the suction pads operating by switching the valves from being shifted from each other.

The fact that the adjusting mechanism composed of the adjusting screw and the lock nut can be adjusted from the outside reduces the number of adjustment steps, facilitates the adjustment, and eliminates the need for highly accurate machining of valve parts.

When the adjusting screw 11 and the lock nut 12 are projected from the end of the valve body 1,
Since the adjustment screw 11 is screwed into the roller lever 9, the adjustment is easy with a simple structure, but the adjustment portion may be easily displaced due to contact with another object.
Since the elastic cap 13 is attached to the base end portion of the adjustment screw 11 and the lock nut 12, the shift movement of the adjustment screw 11 and the lock nut 12 is suppressed, and at the same time, a cushioning action is provided when contacting with another object. be able to.

[0015]

According to the present invention described in detail above, since the mechanical valve itself is provided with the adjusting mechanism which can be easily adjusted from the outside, it is possible to easily eliminate the variation in the switching point of the valve body for each product. Moreover, since the elastic cap is attached, it is possible to prevent the adjustment portion from easily shifting due to contact with another object.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

[Explanation of symbols]

1 valve body, 5 valve body, 9
Roller lever, 9a roller, 11 adjusting screw, 12 lock nut, 13
Elastic cap.

Claims (1)

[Scope of utility model registration request] 1. A valve body for switching an output flow path between a negative pressure and a positive pressure is accommodated inside the valve body so as to be slidable in its axial direction, and a dog contacting a roller is applied to both ends of the valve body. A roller lever that mechanically presses the valve element by contact to switch the flow path is pivotally attached by protruding the roller to the side surface side of the valve body, and the tip of each roller lever is the end of the valve element. The adjustment screw whose base end projects outward from the end surface of the valve body, is fixed by a lock nut, and the base end of the adjustment screw protruding outward from both ends of the valve body and A mechanical valve characterized in that an elastic cap is attached to the lock nut.