DE8400084U1 - Proportional automatic compressed air control device for air cushions - Google Patents

Description

-3-

fMTSNTANWÄLTB

XILLENTI N

/ WRl (ORUCKeNSTR. 18

MUNICH 2

Proportional automatic air pressure control device for air cushions

The invention relates to a proportional automatic Compressed air control device for one, several to one Air cushion carrier pallet having an air cushion that can be connected to a compressed air source.

The invention is based on the object of a proportional automatic compressed air control device for a / several inflatable ones that can be connected to a compressed air source Indicate air cushion carrier pallet with air cushions / the maintenance of a given lifting height independent of the respective load and its distribution the pallet, as well as with different surface roughness and bumps.

This task is done by a proportional automatic Compressed air control with the features of claim 1 solved.

Advantageous refinements of the invention are set out in the subclaims refer to.

The invention is illustrated below using an exemplary embodiment for an air cushion carrier pallet with reference to drawings

• · · L.

I (111 · V

-4-explained in more detail. It shows:

Pig. 1 is a schematic of an air cushion carrier pallet from below Depiction,

Fig. 1 is a section along line H-II in Fig. 1,

3 shows a circuit diagram of an automatic compressed air control device.

The air cushion carrier pallet shown in FIGS. 1 and 2 has a carrier 1 with four inflatable air cushions 2, 3/4, 5 of known design arranged on the underside. In the example shown, each air cushion 2, 3, 4, 5 is one automatic compressed air control device 6,7,8,9 assigned. However, it is also possible with a compressed air control device to control two or more air cushions at a time.

Each of the automatic compressed air control devices 6, 7,8,9 has a pressure control valve 10 (see Fig. 3) that can be controlled by a controller 11 as a function of a transmitter of the lifting height 13.

The pressure control valve 10 is input side via a line 14 and a shut-off valve 15 with a compressed air source 16 and on the output side connected to the interior of the (or the) associated individual air cushion (s) 2,3,4,5.

The pneumatically designed control 11 of the pressure regulating valve 10 contains a delay and compensation element 17, the upper a shut-off device 18 to the compressed air source 16 connected and with a venting device

19 is connected.
35

-δ-The delay and compensation element 17 has two adjustable Throttle check valves 20,21 and a memory 22 for the control compressed air.

The shut-off device 18 consists of a mechanical one

switchable directional valve 23 and a pneumatically switchable 3/2 way valve 24 and the venting device from one mechanically switchable 3/2 way valve 25..

The transmitter 12 of the lifting height 13 is in the exemplary embodiment Mechanically executed and contains a movably arranged plunger 26, which by a spring 27 in contact with the bottom sliding surface 28 is held. With the plunger 26 are two length-adjustable shift rods 29,30 different The effective length is firmly connected by means of a driver 31. The shift rod 29 is arranged such that it is the first with an increasing stroke height 13 given by the set effective length of the shift rod 29 Stroke 13, which corresponds to the optimally inflated working position of the Air cushion 5 corresponds to the 3/2 way valve 23 of the shut-off device 18 actuated. This switches the pneumatically switchable 3/2 way valve 24 to the blocking position.

However, if the lifting height continues to rise up to a predetermined effective length of the shift rod 29 maximum limit value, the 3/2-way valve 25 of the venting device 19 is actuated by the switching rod.

The compressed air control device 9 for the air cushion works as follows:

Both the control pressure and the Feed pressure in the pressure control valve 10 zero, and the carrier 1 with its empty air cushions 5,6,7,8 rests on its supports 32 on the floor sliding surface 28. Through open of the shut-off valve 15 comes from the compressed air source 16

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Compressed air through the line 14 to the inlet of the pressure control valve 10. At the same time, the control pressure 1m pressure control valve 10 is built up. The supplied compressed air passes through the 3/2-way valve 24, which is open in the initial position, through the throttle check valve 21, both into the memory 22 and into the control chamber of the pressure regulating valve 10. The compressed air can still pass through the throttle check valve 20 of the vent line, but is the other one Path closed by the 3/2 way valve 25, which is closed in the initial position. The higher the control pressure now rises, the more compressed air passes through the pressure control valve 10 into the air cushion 5, which inflates. When the specified working height is reached, the 3/2 way valve 23 is actuated - opened for the flow of compressed air - and the 3/2 way valve 24 is closed. (With regard to the disclosure of the circuit, reference is made to the detailed illustration of the shut-off device 18 in FIG. 3). By closing the 3/2-way valve 24, the supply of control air to the pressure control valve 10 is interrupted, so that no further build-up of the control pressure can take place.

This increases the control pressure of the pressure regulating valve 10 limits a value depending on the lifting height and thus also 2 ^ of the load, whereby a regulation of the Working compressed air flow guaranteed depending on the load is.

With the commercially available simple pressure regulating valves 10

an opening is provided in the control chamber, by means of which the control chamber communicates with the atmosphere. The opening causes a slow reduction in the control pressure. By the presence of the pressure storage tank

22 this reduction is delayed =
35

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J But it can also be a pressure control valve 10 with an air }

tight control chamber are provided, then remains with §

Shutting off the compressed air supply through the 3/2 way valve 24 f

the control pressure practically constant and thus also the strength |

the compressed air supply into the air cushion. f

If you drive with the air cushion 5 via a rougher Bodengleit- \ area 28 or over minor cracks or bumps, ER; This is followed by a stronger outflow of compressed air from the air cushion 5, which causes a sagging of the air cushion 5 and thus also a reduction in the lifting height 13. As a result, the switching rod 29 releases the 3/2-way valve 23, which moves into its closed starting position. As a result, the 3/2 way valve 24 opens, so that the control pressure can build up accordingly until the compressed air flow increases so that the drainage due to the rough ground or the cracks compensated and the predetermined lift height is reached again, after which the control pressure air supply as described above, is interrupted.

If you have passed the rough ground or the cracks and bumps and there is less air flowing out than before, increases with the regulated constant Compressed air supply strength the lifting height 13 over the predetermined Value addition. This has the effect that the switching rod 30 actuates the 3/2 way valve 25 and opens it. This can Control compressed air through the throttle check valve 21 and the opened 3/2 way valve 25 escape until the predetermined lifting height 13 is reached, at which the switching rod 30 is no longer in engagement with the 3/2 way valve 25, which returns to its closed starting position.

The one-way flow control valves 20, 21, but also the memory 22 serve that the construction and also the dismantling of the tax tax compressed air is slowed down, continuous and smooth,

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so that no vibrations can be transmitted to the pallet. Eoirch setting the throttles, the build-up and decrease of the control pressure air strength can be slowed down or accelerated.
5

In the case of a transport pallet with several unevenly loaded Air cushions 2,3,4,5 with automatic air pressure control devices 6,7,8,9 will be the least loaded Air cushions reach the prescribed lifting height 13 first and the most loaded air cushions as last. In the final state, the transport pallet definitely has the same transport height on all sides.

The compressed air control devices can be connected to any Place to be arranged. However, it is advisable to arrange them symmetrically so that they are relative to each other in terms of weight balance. The transducers 12 are preferably to be arranged on the outer edge where there are fluctuations in the lifting height or inflation to be most effective. 20th

The control of the shut-off device 18 and the venting device 19 can also be done in any other way, e.g. electrical, electromagnetic, hydraulic and the Transmitters 12 can also pick up any electrical, optical, hydraulic or pneumatic control pulses and pass it on. The transmitter 12 can instead of the lifting height 13, the distance of the carrier 1a from the BodengLeitfLache reproduces, also the moving point of contact from a support point to any point on the upper outer wall

Scan (33) of the inflatable ring body of the air cushion. The transmitter 12 can also be part of the wall 33.

Claims (6)

PATENTANWALTt ZELLENTl N ZWEIBRÜCKENSTH. 16 COQO MÜNCHEN 2 March 16, 1984 dsn 84 298 ίθ Slm claims 1. Proportional automatic air pressure control device for one or more connected to a compressed air source 5 air cushion carrier pallet having bare air cushions, characterized in that they have at least one simple pressure control valve (10) and a control (11) with an encoder (12) for measuring a predetermined lifting height (13) of the pallet above the Floor sliding surface (28) or a predetermined degree of swelling of the respective one measured by the transmitter (12) Has air cushion (s) (2,3,4,5). __ 2. Device according to claim 1, characterized in that 2 B that the chamber of the pressure control valve acted upon by the control pressure (10) is airtight. 3. Device according to claim 1 or 2, characterized gekennzeich- net ₃ Q that the control unit (11) contains a shut-off device (18) for the supply of control air and eima ventilation device (19). 4. Device according to one of claims 1 to 3, characterized gg marked that in the supply line for control air, in the pressure regulating valve (10) and in the venting line a throttle valve or a throttle check valve (20,21) is built in. • · · ·· ■■ Γ2 "" * 15. Device according to one of claims 1 to 5, characterized characterized in that the pressure control valve (10) has a Has memory (22) for control compressed air. 5 6. Device according to one of claims 1 to 5, characterized characterized in that the transmitter (12) is part of the wall (33) of the air cushion (2,3,4,5). 10 15 20 25 30 36