JPH0694360B2 - Attachment in vacuum lift device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an attachment of a vacuum lift device for lifting an object while sucking it.

[0002]

2. Description of the Related Art As a device for adsorbing and lifting an object by a single pressure source, it is disclosed in Japanese Utility Model Publication No. 62-25344.
As disclosed in the publication, one end of an axially expandable / contractible lift tube is fixedly or movably supported and communicated with a vacuum pump, and the other end has a suction port for communicating the inside and outside of the lift tube. A vacuum lift device provided with a suction pad is known.

[0003]

However, in the above-mentioned conventional vacuum lift device, it is not possible to lift an object (for example, a wire rod) that does not have a predetermined area for the suction pad to suck, and the vacuum lift device is used. There was a problem that it might not be able to be effectively utilized even though it was equipped.

Therefore, an object of the present invention is to provide an attachment for lifting an object in a vacuum lift device by a method other than suction such as lifting.

[0005]

SUMMARY OF THE INVENTION According to the present invention, one end of a lift tube which can be expanded and contracted in the axial direction is fixedly or movably supported and communicated with a vacuum pump, while the suction port communicates with the inside and outside of the lift tube. In a vacuum lift device provided at the other end of the lift tube, an attachment attached to the suction port, an opening provided in the attachment for communicating the outside and the inside, a valve for contacting and separating from the opening, Lifting means provided in the attachment, means for detecting a load applied to the lifting means, and the valve is opened when the detection result shows no load, and closed when the lifting means is under load. And means.

[0006]

Therefore, when the hoisting means has no load, the valve is opened and external air is sucked into the inside of the lift tube from the opening of the attachment to prevent the negative pressure from increasing. While being held in position, when an object is supported by the lifting means and a load is applied, the opening closes and the inside and outside of the lift tube are shut off, and the lift tube is sucked by the vacuum pump and the negative pressure inside is lifted. Is contracted in the axial direction and the object supported by the lifting means is lifted to a predetermined position.

[0007]

EXAMPLE An example of the present invention is shown in FIGS.

In FIGS. 1 to 3, reference numeral 1 designates a lift tube which can be expanded and contracted in the axial direction, a material having airtightness and elasticity such as resin, which is formed into a bellows shape, and has a coil shape (not shown) on the inner circumference. While being able to expand and contract in the axial direction via a wire rod,
The cross-sectional shape in the direction perpendicular to the axis can be retained.

The base end 1A of the lift tube 1 is a hose 1.
The base end portion 1A is connected to a vacuum pump (not shown) via 2 and is connected to a pulley 18 running on a rail 17, and is supported movably within a predetermined range.

A suction device 1 having a handle 14 for operating the lift tube 1 at a lower end portion 1B of the lift tube 1.
0 is provided, and the adsorption device 10 is provided with an adjustment lever 13. The adjustment lever 13 limits the opening area of an opening (not shown) provided on the side surface of the lift tube 1 so that Adjust contraction and extension. A suction port 11 is provided at the open end of the suction device 10.

The attachment 2 is fastened to the suction port 11 to the suction device 10 via a mounting pad 24 fixed to the upper surface.

The attachment 2 is formed in the shape of a hollow box, and an opening 20 of a predetermined size is formed in the central portion of a top plate 2A constituting the upper portion of the attachment 2 to form the inside and outside of the lift tube 1. And a mounting pad 24 formed of a member having airtightness around the opening 20.
Are provided via the reinforcing plate 25.

A bottom plate 2 which constitutes the lower part of the attachment 2.
A ventilation port 21 that communicates the inside and outside of the attachment 2 is provided at a predetermined position of B, and the inside of the lift tube 1 is formed so as to communicate with the outside through the ventilation port 21 and the opening 20.

On both sides of the attachment 2 sandwiching the mounting pad 24, the bottom plate 2B penetrates the top plate 2A and the bottom plate 2B.
Bolts 22 projecting downward are respectively provided, and two nuts 23 are fastened to each other at predetermined positions of the bolts 22 to prevent the bolts 22 from coming off the attachment 2.

As shown in FIG. 2, a support plate 30 having a through hole 30A through which the bolt 22 is inserted is attached to the lower surface of the attachment 2, and the support plate 30 has a hook 4 as a lifting means via a pedestal 32. Is fixed downward, while being supported freely displaceable in the vertical direction between the lower surface of the bottom plate 2B and the upper end surface of the nut 23. A through hole 31 having the same size as the vent hole 21 is provided at a position corresponding to the vent hole 21 provided on the bottom plate 2B of the support plate 30.

A rod 6 is erected upward in the center of the support plate 30 corresponding to the opening 20 provided in the top plate 2A of the attachment 2. The rod 6 slidably penetrates the bottom plate 2B, and further projects from the opening 20 toward the inside of the lift tube 1. The opening 2 from which this rod 6 protrudes
A valve 3 that comes into contact with and separates from the upper surface of the reinforcing plate 25 is attached at a predetermined position above 0, and a spring 5 that biases the valve 3 upward is interposed between the valve 3 and the inside of the bottom plate 2B. To be dressed.

The spring 5 detects that a load is applied to the hook 4 and closes the valve 3 while driving the valve 3 to a predetermined position when the hook 4 has no load.

The support plate 3 connected via the rod 6
0 and the distance between the valve 3 and the support plate 3 at the valve 3 closed position.
The lower surface of 0 contacts the upper end surface of the nut 23, and the upper surface of the support plate 30 contacts the bottom plate 2B.

With the above construction, the operation will be described below.

As shown in FIGS. 1 and 2, in the unloaded state in which the object is not suspended on the hook 4, the valve 3 forms a predetermined gap with the reinforcing plate 25 by the urging force of the spring 5. The support plate 30 coupled via the rod 6 is urged upward together with the valve 3 to come into contact with the bottom plate 2B of the attachment 2.

In this unloaded state, the air sucked by the vacuum pump (not shown) via the hose 12 passes through the through hole 31 and the vent hole 21 from the outside of the attachment 2 and passes through the valve 3 and the reinforcing plate 25 in a predetermined manner. The negative pressure inside the lift tube 1 is prevented from increasing due to being sucked through the gap, and the stretched state is maintained.

On the other hand, as shown in FIG.
When 0 is suspended and a load is applied, the load of the object 60 displaces the support plate 30 downward against the spring 5, and the support plate 30 is guided by the bolt 22 until the lower surface abuts the upper end surface of the nut 23. To descend. As the support plate 30 descends, the rod 6 and the valve 3 also descend, and the support plate 30 moves the nut 23
The valve 3 comes into contact with the reinforcing plate 25 at a position where the opening 20 is closed. After the valve 3 is closed, when the adjustment lever 13 is operated to close the opening (not shown) provided on the side surface of the lift tube 1, the vacuum pump increases the negative pressure inside the lift tube 1. As the negative pressure increases, the lift tube 1 contracts in the axial direction and lifts the object 60 suspended from the hook 4 upward.

After transporting the object 60 to a desired position, the negative pressure of the lift tube 1 is reduced by operating the adjusting lever 13 and supplying air from an opening (not shown) provided on the side surface of the lift tube 1. The object 60 that has been extended by and is hung by the hook 4 can be placed at a desired position.

When the object 60 is detached from the hook 4, the valve 3 is opened again by the urging force of the spring 5, and the air flowing in from the vent hole 21 and the through hole 31 flows into the lift tube 1 from the opening 20. The inside of the lift tube 1 can hold the hook 4 at a desired position without increasing the negative pressure.

The holding position of the lift tube 1 can be set to a desired position between the most extended position and the most contracted position by operating the adjusting lever 13, and the lift tube 1 is extended or contracted. If the hook 4 is moved to the position where the object 60 is lifted, the above-mentioned lifting and carrying work can be continuously performed.

FIG. 4 shows another embodiment, in which a U-shaped fork 40 as a lifting means is fixed to the lower surface of the attachment 2 with a bolt 41, and the space between the bolt 41 and the bottom plate 2B of the attachment 2 is fixed. Is provided with a pressure sensitive switch 50 as a means for detecting a load applied to the fork 40, and the opening 2 for communicating the upper surface and the lower surface of the attachment 2 with each other.
A valve 33 driven by an actuator 51 is provided at 6, and the pressure sensitive switch 50 and the actuator 51 are respectively connected to a controller (not shown). The other structure is the same as that of the first embodiment.

When an object (not shown) is supported by the fork 40, the pressure sensitive switch 50 is actuated, and the controller 51 (not shown) drives the actuator 51 to close the valve 33, that is, to close the opening 26 and further to adjust the adjusting lever. By operating 13 to close the opening on the side of the lift tube 1 (not shown), the object can be lifted in the same manner as in the first embodiment.

On the other hand, when the pressure-sensitive switch 50 detects no load on the fork 40, the controller causes the actuator 5
Since the valve 1 is driven to open the valve 33, as in the first embodiment, the inside of the lift tube 1 does not generate a large negative pressure, so that the lift tube 1 does not contract and maintains the expanded state.

Although the hook 4 or the fork 40 is provided as the hoisting means in the above embodiment, the hoisting means attached to the pedestal 32 can be replaced according to the object to be lifted, and although not shown, a clamp for holding the object or the like. May be attached.

[0030]

As described above, according to the present invention, while the lifting means is provided in the attachment of the vacuum lift device,
Since a means for opening and closing the valve according to the load applied to the lifting means is provided, the valve closes when the lifting means supports the object, and a negative pressure is generated inside the lift tube to contract in the axial direction. It is possible to lift an object, and it is possible to lift an object such as a wire rod that could not be adsorbed in the past, and it is possible to effectively use the vacuum lift device.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part of the attachment with the valve opened.

FIG. 3 is a sectional view of an essential part of the attachment with the valve closed.

FIG. 4 is a schematic view showing another embodiment.

[Explanation of symbols]

 1 Lift Tube 1A Base End 1B Tip 2 Attachment 3 Valve 4 Hook 5 Spring 11 Suction Port 20 Opening 21 Vent 30 30 Support Plate

Claims (1)

[Claims] 1. A lift tube axially expandable and contractible is fixedly or movably supported and communicated with a vacuum pump, while a suction port is provided at the other end of the lift tube for communicating the inside and outside of the lift tube. In the vacuum lift device, an attachment attached to the suction port, an opening provided in the attachment for communicating the outside and the inside, a valve coming into contact with and separated from the opening, and a lifting means provided in the attachment. And a means for detecting a load applied to the lifting means, and a means for opening the valve when the detection result indicates no load and a means for closing the valve when the lifting means is under load. Attachment in a vacuum lift device.