JPS6154652B2 - - Google Patents

Description

Installed suction arm 26 A suction lifting device characterized by comprising:

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to an apparatus for suctioning and lifting objects to be attracted, such as plastic bags.

[Conventional technology]

In conventional devices that automatically package items using plastic bags, etc., a large number of stacked bags are taken out one by one from the top and fed to the automatic packaging device, so it is difficult to wrap the bags horizontally and vertically. Multiple suction cups are installed on the underside of the base arm, which allows it to move freely.
A suction lifting device is used in which this suction cup is connected to a vacuum pump through a flexible conduit, and the suction cup suctions and lifts the top layer of the stacked bags.

[Problem that the invention seeks to solve]

According to the conventional suction lifting device as described above, if a suction error occurs in even one of the multiple suction cups, the bag may shift during lifting or transportation, or the bag may completely peel off. However, there are problems in that the bag cannot be accurately fed to a desired fixed position, which may impede subsequent automatic packaging work or make automatic packaging impossible.

In the present invention, if for some reason some or all of the suction cups do not suction the object and you try to start lifting, the suction work is automatically redone to ensure that all the suction cups are suctioned. It is an object of the present invention to provide a suction and lifting device that solves the above-mentioned problems by suctioning objects.

[Means for solving problems]

In order to achieve the above object, the suction lifting device of the present invention includes a base arm 1 attached to an appropriate moving device, and a valve box 5 attached to the base arm 1 so as to be raised and lowered by an appropriate device. In the valve chamber 10 connected to a vacuum device, a valve body 12 biased downwardly by a spring 13 to a degree stronger than atmospheric pressure is fitted in the valve body 12 so as to be able to move up and down. An adsorption valve 4 having a first ventilation hole 14 communicating between the upper and lower parts of the valve body 12 and a valve rod 15 hanging from the center of the lower surface of the valve body 12; 17a is fixed and the valve rod 15 is loosely fitted with a slight gap 20, and the valve rod 15 is attached to the upper end of the valve rod 15 and moves up and down together with the valve rod 15 to close the gap. an annular closing body that can open and close 20; and ventilation holes 25 and 24 that are fitted into the cylinder 17 and whose upper surface faces closely to the lower surface of the valve rod 15, and which communicates between the inner upper part and the outer lower part of the cylinder 17. The piston devices 22 and 21 are drilled, and are attached to the lower end of the cylinder 17 so as to be able to rise and fall freely with a compression spring 28 interposed, and the upper surface of the piston device 22 is attached to the lower end of the cylinder 17.
The piston 2 is attached to the lower end of the piston 2.
The suction arm 26 is provided with a required number of suction cups 29 that communicate with the two ventilation holes 25.

[Effect]

Since the suction lifting device of the present invention has the above-described configuration, it operates as follows.

When each suction cup 29 is separated from the object to be sucked below, even if the vacuum pump is activated to evacuate the valve chamber 10 of the suction valve 4, the spring 13 pushes the valve body 12 down to the lower limit. An annular closure body hermetically isolates the valve chamber 10 from the cylinder 17.

In this state, when the suction valve 4 is lowered, the cylinder 17 and the suction arm 26 are lowered together with the suction valve 4.

Then, when each suction cup 29 comes into pressure contact with the object to be sucked,
Although the suction arm 26 and the piston devices 22, 21 stop descending, the suction valve 4 and cylinder 17 descend against the compression spring 28, so the piston devices 22,
21 rises relative to the cylinder 17, causes the piston devices 22, 21 to push up the valve rod 15, and the valve body 12 rises.

Then, the annular blocker rises together with the valve rod 15, and the valve chamber 10 of the adsorption valve 4 and the cylinder 17
Since it communicates with the ventilation hole 14 through the gap 20, each suction cup 29 that communicates with the cylinder 17 through the ventilation holes 24 and 25 attracts the object to be attracted, and the piston devices 22 and 21 are held at the upper limit. Ru.

Next, when the suction valve 4 is raised, each suction cup 29
rises while adsorbing the object.

At this time, for some reason, either sucker 2
When the suction arm 9 starts to rise without suctioning an object to be suctioned, the air entering through the suction cup 29 brings the inside of the cylinder 17 to atmospheric pressure, so the suction arm 26
The force of the compression spring 28 immediately lowers the suction cup 2.
9 is brought into pressure contact with the object to be attracted.

At this point, the valve chamber 10 and the cylinder 17 are communicating with each other, so the suction cup 29 sucks the object to be sucked again.

This device, which has sucked objects to each suction cup 29 in this way, is horizontally swung by a moving device such as a rocking device attached to the base arm 1, and the sucked objects are moved to a desired position. After transporting it to the location, the vacuum can be released.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

A pneumatic telescoping device 2 facing downward is fitted approximately in the center of the horizontal piece 1a of the base arm 1 which is L-shaped in front, and on both left and right sides of the pneumatic telescoping device 2,
Guide holes 3, 3 facing in the vertical direction are bored.

Reference numeral 4 designates a downwardly facing suction valve, and a mounting plate 6 is connected to the upper end of the downwardly facing bottomed cylindrical valve box 5 and is connected to the side. At both ends of the mounting plate 6, there are formed the above-mentioned guide holes that face upwardly. 3
A guide rod 7 is threaded to slidably pass through the guide rod 7.

The suction valve 4 includes a downward dish-shaped disc 8 screwed onto the upper end of the guide rod 7 and a compression spring 9 wound between the base arm 1.
The base arm 1 is urged upward and is normally in contact with the lower surface of the base arm 1.

The valve box 5 has an exhaust hole 1 that communicates with the upper end of the valve chamber 10.
1 is bored, and the exhaust hole 11 is connected to a vacuum pump (not shown).

A bottomed cylindrical valve body 12 is fitted into the valve body 5 so as to be able to slide vertically, and is biased downward by a compression spring 13 provided between the valve body 5 and the upper bottom of the valve body 5. There is.

The valve body 1 in the valve chamber 10 is located at the bottom of the valve body 12.
2. The first ventilation holes 14, 14 communicate the upper and lower parts of
is drilled. A valve rod 15 is vertically disposed at the center of the lower surface of the valve body 12, and an O-ring 16 is fitted onto the upper end of the valve rod 15.

A cylinder 17 is fixed to the lower end of the adsorption valve 4, which is coaxial therewith and whose upper surface is closed. A guide hole 19 facing in the vertical direction is bored at the outer end of each mounting plate 18 connected to both sides of the lower end of the cylinder 17 .

The valve rod 15 is loosely fitted into a through hole bored in the center of the upper base 17a of the cylinder 17 with a gap 20 between the upper base 17a and the valve body 12 which is biased downward. The O-ring 16 interposed in the valve chamber 1
0 airtightness is maintained.

Slightly below the valve rod 15 in the cylinder 17, a press plate 21 and a piston 22, which are arranged vertically and are integrated, are fitted inside. An upward protrusion 23 is provided at the center of the upper surface of the pressing plate 21;
Second ventilation holes 24, 24 are formed on the sides of the piston 22, and a third ventilation hole 25 is formed on the axis of the piston 22, which communicates with each of the second ventilation holes 24. .

At the lower end of the piston 22, a suction arm 2 facing to the side is provided.
6 is airtightly fitted at the center of the upper surface. Suction arm 2
The lower ends of guide bolts 27 that are inserted into the respective guide holes 19 of the cylinder 17 from above so as to be vertically slidable are screwed onto the left and right sides of the suction arm 26 .
is biased downward by a compression spring 28 wound around the guide bolt 27.

A required number of suction cups 29 are vertically provided on the lower surface of the suction arm 26. Each suction cup 29 is connected to the third portion of the piston 22 by a communication hole 30 formed laterally in the suction arm 26.
It communicates with the ventilation hole 22.

In the apparatus of the present invention having the above-mentioned structure, when each suction cup 29 is spaced apart from the bag 31 below it, as shown in the drawing, even if the vacuum pump is operated to evacuate the valve chamber 10 of the suction valve 4, the spring 13 pushes down the valve body 12 to the lower limit, so the O-ring 16
The valve chamber 10 and cylinder 17 are hermetically isolated.

In this state, when the pneumatic expansion device 2 is expanded by a high-pressure air source (not shown), the suction valve 4, cylinder 17, and suction arm 26 are moved against the spring 9.
and descend.

Then, when each suction cup 26 comes into pressure contact with the bag 31, the suction arm 26 and piston 22 stop descending, but the suction valve 4 and cylinder 17 resist the spring 28 until the pneumatic expansion device 2 is fully expanded. As it descends, the piston 22 rises relative to the cylinder 17, the protrusion 23 of the pressing plate 21 pushes up the valve rod 15, and the valve body 12 rises.

Then, the O-ring 16 rises together with the valve rod 15, and the valve chamber 10 of the adsorption valve 4 and the cylinder 17
Since the cylinder 17 communicates with the ventilation hole 14 through the gap 20, the second ventilation hole 24 and the third ventilation hole 25 are connected to each other through the gap 20.
Each suction cup 29 communicating with the bag 31 through the communication hole 30 attracts the bag 31, and the piston 22 is held at the upper limit.

Next, when the pneumatic expansion/contraction device 2 is shortened, the suction valve 4 rises due to the force of the spring 9, so that each suction cup 29 rises while adsorbing the bag 31.

At this time, for some reason, either sucker 2
9 starts to rise without attracting the bag 31,
The air entering the suction cup 29 brings the inside of the cylinder 17 to atmospheric pressure, so the suction arm 26 immediately descends due to the force of the spring 28 and lifts the suction cup 29 into the bag 3.
1.

At this point, the valve chamber 10 and the cylinder 17 are communicating with each other, so the suction cup 29 sucks the object to be sucked again.

This device, in which the bag 31 is sucked to each suction cup 29 in this way, is attached to the vertical piece 1b of the base arm 1.
For example, the vacuum may be released after swinging the bag 31 forward using a swinging device (not shown) and clamping the attracted bag 31 to the automatic article packaging device.

〔Effect of the invention〕

As is clear from the above, according to the present invention, if for some reason some or all of the suction cups fail to suction the object and lifting is attempted, the suction work is automatically restarted. All the suction cups can reliably suck the object, and it is possible to eliminate the risk of displacement or separation of the object due to suction errors in the suction cups in conventional devices.

[Brief explanation of the drawing]

FIG. 1 is a central vertical sectional front view showing an example of the apparatus of the present invention, and FIG. 2 is a side view thereof. DESCRIPTION OF SYMBOLS 1... Base arm, 1a... Horizontal piece, 1b... Vertical piece, 2... Pneumatic expansion and contraction device, 3... Guide hole, 4...
... Adsorption valve, 5 ... Valve box, 6 ... Mounting plate, 7 ... Guide rod, 8 ... Disc, 9 ... Compression spring, 10 ... Valve chamber, 11 ... Exhaust port, 12 ... Valve Body, 13... Compression spring, 14... First ventilation hole, 15... Valve lever, 1
6...O-ring, 17...cylinder, 17a...
Upper bottom, 18... Mounting plate, 19... Guide hole, 20...
...Gap, 21...Press plate, 22...Piston, 2
3... Protrusion, 24... Second ventilation hole, 25... Third
Ventilation hole, 26... Suction arm, 27... Guide bolt,
28... Compression spring, 29... Suction cup, 30... Communication hole, 31... Bag.

Claims (1)

[Claims] 1. A base arm 1 attached to an appropriate moving device; A valve box 5 is attached to the base arm 1 so as to be raised and lowered by an appropriate device, and the valve box 5 is connected to a vacuum device. A valve body 12 which is biased downward more strongly than atmospheric pressure by a spring 13 is fitted into the valve chamber 10 so as to be able to rise and fall freely, and the upper and lower sides of the valve body 12 in the valve chamber 10 are communicated with this valve body 12. An adsorption valve 4 having a first ventilation hole 14 and a valve rod 15 hanging from the center of the lower surface of the valve body 12; an upper base 17a fixed to the lower end of the adsorption valve 4; A downward cylinder 17 into which the rod 15 is loosely fitted with a slight gap 20; and an annular closing body attached to the upper end of the valve rod 15 and capable of moving up and down together with the valve rod 15 to open and close the gap 20. and a piston device 22 which is fitted into the cylinder 17, whose upper surface faces closely to the lower surface of the valve rod 15, and which is provided with ventilation holes 25 and 24 that communicate the inner upper part and the outer lower part of the cylinder 17. , 21 are attached to the lower end of the cylinder 17 via a compression spring 28 so as to be able to rise and fall freely, and the upper surface is attached to the piston 22.
The piston 2 is attached to the lower end of the piston 2.
A required number of suction cups 29 communicating with the ventilation holes 25 of No. 2 are provided.