JPH036594Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cylinder circuit of a plate suction device suitable for stably supplying plates to a transfer press at high speed.

Conventionally, in a plate suction device, one cylinder 2 is placed above the stacked plates 1 as shown in FIG.
A required number of suction cups 3 are attached to the piston rod of the cylinder 2 depending on the dimensions of the plate material 1.
was attached. The cylinder 2 is connected to an air circuit 4 for supplying and discharging compressed air to lower the piston rod, and an air circuit 5 for raising it, and the suction cup 3 is connected to a vacuum circuit 6 for generating vacuum. A vacuum circuit 6 connected to one suction cup 3 in the center was provided with a negative pressure switch 7, and this signal caused the air circuit 4 to exhaust air and the air circuit 5 to supply air to raise the piston rod of the cylinder 2. . As shown in Fig. 2, the suction cup 3 was attached to the piston rod with a ball joint 8 so that it could swing freely. If the suction cup 3 is bent or twisted due to curling, even if the suction cup 3 is pressed against the plate 1, the swing radius l
The suction cup 3 on the periphery did not come into close contact with the surface of the plate 1, and the negative pressure switch 7 was activated to raise the plate 1, which had been sucked on the way.
The problem was that it would fall. Furthermore, even when the adhesion of the suction cup 3 is good, as shown in Fig. 2, the oscillation radius l of the suction cup 3 is large, resulting in large lateral deviation a, which causes the disadvantage of causing the lifted board 1 to shift. Ta. Further, due to the change in the dimensions of the plate material 1, when replacing the suction cup 3, a worker must get under the cylinder 2, making the work dangerous. Furthermore, when the solenoid valves 4a and 5a of the air circuits 4 and 5 are switched by the signal from the negative pressure switch 7, the air flows through the solenoid valves 4a and 5a, so the resistance causes poor response and prevents the suction cup 3 from rising. There was a delay, the plate material 1 was pressed down too much, resulting in poor separation, and the high speed was poor.

The purpose of this invention is to eliminate these drawbacks by providing multiple cylinders each with a suction cup, which can be used selectively and raised and lowered in synchrony, and has good responsiveness, high speed, and suction. An object of the present invention is to provide a cylinder circuit for a plate material suction device that can improve performance. Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 3, a plate suction device according to the present invention provided above the material supply device 9 is shown. In this example, five cylinders 11 each having a suction cup 10 attached to the lower end of its piston rod 20 are provided. When the size of the plate material 1 is small, only the central cylinder 11a is used, and as the size of the plate material 1 increases, 1
1b and 11c are added in this order. Therefore, two suction cups 10 are often provided in the central cylinder 11a. Although not shown in the figure, the material supply device 9 has a conveyor that carries in a pallet loaded with plate materials 1 below, and uses a lifter to push up the plate materials 1 from the pallet that has been stopped at a fixed position. 13 and held at a constant height. The cylinder 11 is supplied with compressed air to raise and lower the suction cup 10, and the magnetic floater 12 picks up the separated plates 1 one by one without pressing them too much, takes them out in order from the top, and transports them in a direction perpendicular to the plane of the paper. The feed bar (not shown) of the transfer press may be transferred via an intermediate conveying device or directly to a feed bar (not shown) of a transfer press. The cylinders 11a, 11b, and 11c are moved up and down in synchronization by an air circuit, which will be described later, but since they are each independent, there is some degree of freedom in their vertical positions.This, combined with the structure of the suction cup 10, which will be described later, prevents the plate material 1 from bending, etc. Even if there is a problem, it adheres well to it and adsorbs quickly and well.

In FIGS. 4 and 5, the cylinder 11a,
The structure of the suction cup 10 provided at the lower end of the piston rod 20 in b and c is shown. The suction cup 10 has a cup 14 made of flexible rubber or the like at a portion that comes into close contact with the plate 1, and the upper end of the cup 14 is fixed to a cup holder 15. The cup holder 15 passes through a hole in a holding member 16 fixed to the lower end of the piston rod 20, and has upper and lower flange portions 15a.
and 15b. Springs 17 and 18 are provided between the holding member 16 and the flange portions 15a and 15b of the cup holder 15, respectively.
and the cup 14 is suspended from the holding member 16. As shown in FIG. 5, the portion of the cup holder 15 that faces the lower end 16a of the holding member 16 is provided with a notch 15c on the opposite side of 180 degrees, which prevents the cup holder 15 suspended by springs 17 and 18 from rotating. . Springs 17 and 18 of the cup holder 15 and the holding member 16
A sloped portion is provided on the surface facing the springs 17 and 18 to avoid interference with the springs 17 and 18 when the cup holder 15 is tilted. A recess 14a is provided on the lower surface of the cup 14, and a vacuum air passage 19 is provided from the recess 14a through the center of the cup holder 15. Cup holder 15
A vacuum air circuit 34, which will be described later, is connected to the upper end of the passage 19.

In FIG. 6, the configuration of the air circuit connected to each cylinder 11 and its suction cup 10 is shown. Air circuits 23a, 23b, 23c are connected to the cylinders 11a, 11b, 11c from a compressed air source 21 via a lubricator 22 to the upper cylinder chamber.
Air circuits 24a, 24b, 2 are provided in the lower cylinder chamber.
4c is connected. Air circuits 23a, b,
c, 24a, b, and c have the same configuration as a, b, and c, respectively, so only 23a and 24a will be explained as representatives. The air circuit 23a includes a pressure reducing valve 25a that sequentially adjusts the air pressure to a constant level from the lubricator 22 to the cylinder 11a, a solenoid valve 26a that is normally switched to supply air by a signal during exhaust, and a check valve 27a that opens when air is supplied. A flow rate control valve 28a is provided in parallel with the suction cup 10 to adjust the flow rate during exhaust to keep the rate of rise of the suction cup 10 constant. The air circuit 24a includes, in order from the lubricator 22, a pressure reducing valve 29a that adjusts the air pressure to a constant level;
An air tank 30a having a required capacity, a check valve 31a that opens when air is supplied, and a suction cup 1 that is installed in parallel with the check valve 31a and adjusts the flow rate when exhausting air.
A flow rate control valve 32a is provided that keeps the downward speed of 0 constant. That is, air at a constant pressure is constantly supplied to the lower cylinder chamber of the cylinder 11a from the air circuit 24a, and air at a constant pressure higher than that of the air circuit 24a is supplied and discharged from the air circuit 23a to the upper cylinder chamber. Suction cup 10
It is configured to move up and down. Therefore, solenoid valve 2
When the suction cup 6a is switched to exhaust, the suction cup 10 can be raised with almost no control delay. Further, the rising and descending speeds of the suction cup 10 are made almost equal by providing flow control valves 28 and 29 for each cylinder 11a, 11b, and 11c, respectively, and by setting the capacity of the tank 30 to a necessary and sufficient appropriate capacity. It is possible to synchronize the raising and lowering of the suction cup 10. Negative pressure generators 33a,
33b, 33c vacuum air circuit 34a, 3
4b and 34c are connected to each other. Electromagnetic valves 35a, 35b, and 35c are connected to the negative pressure generators 33a, 33b, and 33c, respectively, and are opened in response to a signal to supply compressed air from the compressed air source 21. The vacuum air circuit 34a is provided with a negative pressure switch 36 that operates with a constant negative pressure and turns off the signal of the solenoid valve 26.

Next, we will discuss the effect. Depending on the dimensions of the plate material 1, the number of cylinders 11 to be used may be one (11a), three (11a and 11b), or five (11a, 11b, and 11c).
Select and use in books. Using the air circuits a, b, c series shown in FIG. 6 corresponding to the selected cylinder 11, the suction cup 10 is controlled to move up and down as follows. The solenoid valve 26 of the air circuit 23 is always in the exhaust state, and the cylinder 11 is in the position where the suction cup 10 is raised. When a signal is sent to the solenoid valve 26, it opens and the compressed air flows through the check valve 27 and flow control valve 28.
Since the air pressure in the air circuit 23 is higher by the required value than in the air circuit 24 which is supplied to the upper cylinder chamber of the cylinder 11 via the suction cup 10, the suction cup 10 begins to descend. The air in the lower cylinder chamber of the cylinder 11 is transferred to the air tank 30 via the flow control valve 32 through the escape valve 3.
Since the opening degree of 2 and the capacity of the air tank 30 are appropriately selected, the suction cups 30 descend in synchronism.
During the descent, a signal is sent to the solenoid valve 35 to open it, and air flows to the negative pressure generator 33 and the vacuum air circuit 3
Negative pressure is generated at 4. When the suction cup 10 is slightly pressed against the plate 1, the cup 14 of the suction cup 10 moves against the plate 1 while changing its vertical position slightly due to the action of the springs 17 and 18 and the degree of freedom of movement between the cylinders 11.
The surface is tilted to ensure rapid and reliable adsorption. When adsorbed, the cup 14 is tilted by the action of the springs 17 and 18 with almost no displacement in the horizontal plane, so that the displacement of the plate 1 can be reduced. Therefore, even if the gap with the magnetic floater 12 shown in FIG. 3 is made small, it can be taken out without interfering with them, and by making the gap small, the separation effect of the magnetic floater 12 is improved and two pieces can be attracted at the same time. It is less likely to cause malfunctions. When the plate material 1 is attracted to the suction cup 10, the negative pressure in the vacuum air circuit 34a becomes large and the negative pressure switch 36 is activated.
operates, and the signal of the solenoid valve 26 turns OFF.
Then it switches to exhaust. When the air circuit 23 is exhausted, the air in the upper cylinder chamber of the cylinder 11 is
The air circuit 24 connects the cylinder 1 via the check valve 31.
The compressed air supplied to the lower part of the suction cup 10 is forced out through the flow control valve 28 to raise the suction cup 10 at a constant speed. The rise of each suction cup 10 can be easily synchronized by adjusting the capacity of the air tank 30, the adjusted pressure of the pressure reducing valve 29, and the opening degree of the flow rate control valve 28. Therefore, the attracted plate material 1 rises while maintaining a horizontal position, and is reliably delivered to the intermediate conveyance device or the feed bar of the press. At the same time, the signal of the solenoid valve 35 turns OFF and the suction cup 10
negative pressure is released. The suction cup 10 is stopped at the upper limit and the above-mentioned process can be repeated by the next signal.

As is clear from the above explanation, according to the present invention, multiple cylinders can be raised and lowered in synchronization, and when the suction cup adsorbs a plate, the responsiveness of the conversion from lowering to raising of the cylinders is good, and the magnetic The plates separated by the net floater are not pushed down too much, thus preventing two plates from being picked up at the same time, and even if the plates are bent, the positions of the multiple cylinders are automatically adjusted slightly up and down. In addition, since the suction cup is suspended by a spring, it is easy to handle, and suction is quick and reliable, so failures are rare. It has great practical effects and advantages.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional front view of a conventional plate suction device and its air circuit diagram, Fig. 2 is a partially cross-sectional front view of a conventional suction cup, and Fig. 3 is a plate suction device according to an embodiment. Front view of a partial cross section, Fig. 4a,
b and c are a plan view, a vertical cross-sectional front view, and a vertical cross-sectional side view of the suction cup, FIG. 5 is a cross-sectional view taken from FIG. 4 c, and FIG. 6 is an air circuit diagram thereof. 1 is a plate material, 2 is a cylinder, 3 is a suction cup, 4
is an air circuit, 4a is a solenoid valve, 5 is an air circuit, 5a
1 is a solenoid valve, 6 is a vacuum circuit, 7 is a negative pressure switch, 8 is a ball joint, 9 is a material supply device, 10 is a suction cup, 11a, b, c are cylinders, 12 is a magnetic floater, 13 is a holder, 14 Ha katsupu,
15 is a cup holder, 16 is a holding member, 17 is a spring, 18 is a spring, 19 is a passage, 20 is a piston rod, 21 is a compressed air source, 22 is a lubricator,
23a, b, c are air circuits, 24a, b, c are air circuits, 25 is a pressure reducing valve, 26 is a solenoid valve, 27 is a check valve, 28 is a flow control valve, 29 is a pressure reducing valve, 30 is an air tank, 31 is a check valve, 32 is a flow control valve,
33 is a negative pressure generator, 34 is a vacuum air circuit,
35 is a solenoid valve, and 36 is a negative pressure switch.

Claims (1)

[Scope of utility model registration request] In the cylinder circuit that supplies and discharges compressed air to the cylinder that raises and lowers the suction cup of the plate material suction device,
a pressure reducing valve that adjusts compressed air to a constant pressure in an air circuit that communicates with the lower cylinder chamber of the cylinder;
An air tank having a required capacity for storing air adjusted to a constant pressure, a circuit in which a check valve that opens toward the cylinder and a flow rate control valve for air flowing out from the lower cylinder chamber are arranged in parallel,
The air circuit connected to the upper cylinder chamber of the cylinder includes a pressure reducing valve that adjusts the compressed air to a constant pressure higher than the constant pressure by a required value, a solenoid valve that constantly exhausts and switches to supply by a signal, and a solenoid valve that is directed toward the cylinder. 1. A cylinder circuit for a plate adsorption device, characterized in that a check valve that opens when the cylinder is opened and a circuit in which a flow rate control valve for air flowing out from an upper cylinder chamber are arranged in parallel.