DE2050761A1 - Device for controlling movement by means of a hydraulic pressure cylinder - Google Patents

Description

Patent attorneys Dipl.-Ing. F. Weickmann, 2050761

Dipl.-Ing. H.Weickmann, Dipl.-Phys. Dr. K. Fincke Dipl.-Ing. RA Weickmann, Dipl.-Chem. B. Huber

8 MUNICH 86, POST BOX 860 820

MÖHLSTRASSE 22, TELEPHONE NUMBER 48 39 21 111

<983921/22>

MATAIRCO S.A.,

63 avenue des Allies

91-Palaiseau / France

Device for motion control by means of a hydraulic pressure cylinder

The invention relates to a device for controlling movement by means of a hydraulic pressure cylinder controlled by a pump, e.g. for swiveling the cabin of a Truck «The printing cylinder can be used as a simple or double-acting

In a device with a double-acting pressure cylinder, it is known to provide a non-return valve which is controlled by the pressurized liquid of the pump, through which the liquid to the one or

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the other side of the piston of the pressure cylinder is pumped by means of a four-way distributor. Such a one
The device is complex and expensive.

In the case of devices with a single-acting printing cylinder, on the other hand, it is necessary to use a hand-held locking device which is arranged on the printing cylinder itself
To prevent liquid from exiting the impression cylinder. Of course, the locking device is in
a certain distance from the pressure cylinders arranged, for example on the pump, and connected to the pressure cylinder via a channel. A leak or a break in this channel prevents it from fulfilling its task, so that the sudden backward stroke of the piston can no longer be prevented.

However, since the user of the locking device to their Actuation must be in the immediate vicinity of the pressure cylinder, i.e. that it is under the pressure » cylinder is lifted or swiveled load, it assumes a very dangerous position if for any Reason the load is suddenly and unintentionally lowered before the user actuates the locking device can, or even if he actuates this.

The invention is based on the object of improving the safety of such a device in such a way that a downward or backward stroke of the piston of the pressure cylinder under the action of the lifted load in the event of a leak or breakage of the pressure cylinder with the line connecting the pump is prevented.

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When using a single-acting pressure cylinder this object is achieved by a non-return valve in the bottom of the pressure cylinder and by a device around the non-return valve from a remote location after opening a decompression valve that is close to the Pump is arranged to open by actuation of the pump, which pump is used to control the outward stroke of the piston of the pressure cylinder is used when the decompression flap is closed.

The control device consists of a flap with different Cross-sections, which are arranged in such a way that they open the non-return valve when the pressure of the Liquid only acts on its small area; In addition, a device is provided to reduce the pressure on both To let surfaces act when the decompression flap is closed, and to only apply pressure to the small ones Allow the area to act when the decompression flap is open.

The latter device consists of two channels, one of which is the channel leading to the small area of the valve with different cross-sections, is directly connected to the pump, while the other, the one on the large area of this flap opens, is either connected to the pump or a collecting container, depending on whether the decompression flap is closed or open.

For this purpose, the device according to the invention an auxiliary flap that connects the two aforementioned channels. This auxiliary flap is in the extension the decompression flap and arranged as

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designed to act opposite to this. A sliding one Crossbar is arranged between the movable elements of these two flaps in such a way that it opens one door when the other is closed.

The device according to the invention with double-acting The pressure cylinder is characterized by the fact that the on the small area of the flap with different Cross-section opening channel has a branch channel which is connected to the end of the pressure cylinder which is opposite the non-return valve, so that it is in the annular space between the pressure cylinder and the rod of the piston opens. Xn the branch duct that has the first flap with different cross-sections with that of the first flap with different cross-sections opposite end of the pressure cylinder connects, a second flap with different Be arranged cross-sections.

The invention is explained below with reference to two exemplary embodiments shown in FIGS. 1 to 10. It shows

1 and 2 show an embodiment of the device according to of the invention with single-acting pressure cylinder in the state that corresponds to the outward stroke of the Corresponds to the piston of the pressure cylinder or the inward stroke of the piston,

FIG. 3 shows an embodiment of the device according to FIG Invention with double-acting pressure cylinder,

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Figures 5, 7, 8 and 10 show a further embodiment of the device geraäss the invention with double-acting pressure cylinder in different working positions, and

4, 6 and 9 schematic representations of a truck with tiltable cabin, which is operated by means of a device according to the invention will.

In FIGS. 1 and 2, a pressure cylinder 1 and a control block 2 are shown, which have a pump and a decompression spindle 4 has.

The pump 3 'is, in a known manner, one with a liquid container 7 connected suction flap 5 and carries a storage flap 6 is on the one hand through a channel 8 directly connected to the smallest area of a flap 9, which has a piston with two cross-sections s and S, and on the other hand by means of a ball valve 10 and a channel 11 with the side of the largest cross section of the valve 9

The chamber above the latter side is connected to the pressure cylinder 1 by means of a ball check valve 12 in connection, and the flap 9 is operated so that it, when operated in the appropriate direction is, the non-return valve 12 pushes into its open position.

The channel 11 is also connected to a collecting container 14, which is generally the same as the container 7, by means of a flap 13 'which is subject to the action of the decompression spindle k.

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Finally, a displaceable cross bar 15 is free placed between the balls of the flaps 10 and 13 to open one when the other is closed, and vice versa.

The operation of this device will now be described.

The process of controlling the outward stroke of the printing cylinder 1 will first be explained with reference to FIG. 1. During this process, it is important to distinguish the pump's stagnation periods from its suction periods.

To control the outward stroke of the pressure cylinder, the decompression spindle k is screwed in and thus closes the flap Ij, which by means of the transverse rod 15 prevents the flap 10 from closing. The pump is thus connected at the same time through the channels 8 and 11 to the two surfaces of the flap 9, which are consequently both exposed to the same pressure. However, since the force that is exerted on the large area of the piston of the flap 9 is greater than that exerted on the small area, the piston is pushed to the outside of its guide, the flap 12 is free, which is below the action of its spring closes, whereby any connection between the pressure cylinder and the outside is prevented, and thus prevents the return of the piston of the pressure cylinder regardless of the state of the rest of the device.

When the pump is operated in such a way that it accumulates the liquid, its pressure is applied to the flap 12 via the Channel 11 acts, greater than the effect of the spring of this

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Flap that rises and allows liquid to enter into the pressure cylinder and thus the outward stroke of its piston.

In the intervals between the congestion periods of the pump, i. E. during the suction periods, the Pressure of the liquid on the flap 12 so that it closes and thus blocks the pressure cylinder. Of the the same process is repeated as long as the pump is operated.

It will now be explained with reference to FIG. 2 how to control the backward stroke of the piston of the pressure cylinder 1 can.

The decompression spindle h is started to be loosened so that the ball of the flap 13 is released in such a way that the spring of the flap 10 closes it, which then opens the flap 13 by means of the transverse rod 15.

The inside of the flap 9 is thus via the channel 11, the flap 13 and the container i4 to atmospheric pressure exposed, while at the same time the connection between the channels 8 and 11 by the flap 10 is interrupted.

The piston of the printing cylinder 1 can therefore not yet move back because the contained in the printing cylinder Liquid is prevented from flowing through the flap 12, which is held closed by its spring.

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If you operate the pump in the damming direction, the pumped liquid does not reach the large area of the flap 9 via the channel 11, as it passes through the flap 10 is closed, but it reaches the small area of this flap via the channel 8. Hence the piston this flap 9 ", which is not subject to any counteraction, is displaced into the interior of its guide and presses on the Ball of the flap 12, which opens and now the liquid of the pressure cylinder via the channel 11 to the container 14 can flow away. The piston of the pressure cylinder can therefore move back.

The return of the piston of the pressure cylinder can therefore only be controlled by operating the pump, which is a represents a particular and important feature of the invention.

The piston can be stopped at any point during the return stroke by closing the flap 13 with the decompression spindle k.

Fig. 3 shows the application of the invention to a double acting Printing cylinder.

In this embodiment, the channel 8, the under the flap 9 opens with a different cross-section, a junction 16 which opens at 17 in the pressure cylinder 1 at the end opposite the non-return valve 12, so that it is always with the annular space 18 between the rod 19 of the piston 20 and the inner wall of the pressure cylinder 1 is in communication.

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It will now be the operation of this embodiment in The return stroke of the piston 20 is described.

As in the previous case, you start the decompression spindle 4, which opens the flap 1jj and that Closing the flap 10 made possible

When the pump is operated, liquid under pressure, e.g. Oil, through channel b to flap 9 pumped, which opens the flap 12. The liquid located at the bottom of the pressure cylinder can therefore through the Channel 11 flow into collecting container 14. Simultaneously is liquid through the channel 16 to the annular Side of the piston, i.e. on the side of the rod 19 ο The piston is therefore pumped towards the bottom of the Displaced pressure cylinder and pushes the liquid back into the container 14, as has been shown.

If now, under the effect of the load that acts on the piston, this tends to move into the pressure cylinder to return at a speed which is greater than that which results from the pump power the pressure in the annular chamber 18 of the pressure cylinder as well as in the channel 16 zero, while at the other side of the piston builds up a pressure which closes the flap 12.

The advantage from the standpoint of safety is the same as that of the single-acting pressure cylinder.)

Figures k to 10 show an embodiment in which a second flap with different cross-sections is arranged in the channel which has the smallest area

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the first flap 9 with different cross-sections connects to the end of the pressure cylinder 1 opposite the non-return valve at 17.

The second flap improves security when a certain facility, e.g. in the case of the Staggering one advanced on a truck The vertical of the center of gravity of the load to be lifted or adjusted beyond the articulation points of the cabin Printing cylinder and the moving load runs. In this position, the thrust that is to be generated changes is when the vertical of the center of gravity of the movable load between the articulation point of the printing cylinder and the articulation point of the load runs into a tensile force.

The embodiment shown in Figures h to 10 makes it possible to control the displacement of the movable load under the same conditions as in the case of a thrust force.

In the figures, the arrangement of such a device on a truck with a tipping device is shown in FIG different work phases.

Fig. H shows a truck before pivoting the cab. The pressure cylinder is hinged at A to the chassis and at C to the cabin. The cabin is hinged to the chassis at B. In this position, the vertical of gravity G of the car, which represents the weight P of the car, runs between points A and B.

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The thrust F, which acts on the pressure cylinder, is therefore maximum. It decreases as the Vertical of the center of gravity approaches point B.

Fig. 5 shows the corresponding position of the device according to the invention. In this figure, 21 is the second flap with different cross-sections and with 22 denotes the ball valve assigned to it. K and M denote the two ends of the pressure cylinder and L the reversal point of the cabin, if its center of gravity acts on their joint axis.

The swiveling of the cabin corresponds to a work phase during which a thrust force up to the swivel point L. is exercised.

The thrust is maximum at K and decreases to zero at L.

When the pump is actuated, the pressure that builds up in the pressure cylinder acts on the large area S. the flap 21 and, thus keeps the flap 22 open. The rod of the piston moves under the effect of this pressure of the printing cylinder through an outward stroke. The liquid contained in the annular space of the pressure cylinder, namely oil, flows off at the bottom of the pressure cylinder via 22, 10 and 12.

In the event of a leak or break in the pipeline while the cabin is pivoting, the pressure drop enables the two non-return valves to close and thus to hold the piston of the pressure cylinder in its position «

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Di * Fig. 6 shows the truck with its cabin, which is in equilibrium. The vertical of the center of gravity G runs duroh the articulation parts B of the jtabine. The force F that is exerted on the pressure cylinder is therefore zero.

Figures 7 and 8 each show the positions of the Device according to the invention, which correspond to the pivoting process and the reversal of the cabin.

In the case of Flg. 7 is the moment T, not shown, the weight of the cabin, multiplied by the lever arm between its center of gravity and its pivot axis, is equal, at L zero and at M maximum.

The vertical of the center of gravity of the cabin is forward their articulation, so that the weight of the cabin tends to pull out the piston of the pressure cylinder. This makes it necessary to control the lowering of the cabin.

Xn Fig. 8 the pressure in the pressure cylinder is zero. That Moment T due to the weight of the cabin causes a pressure that is greater, the greater T is, in which annular space of the pressure cylinder and the various lines up to the flap 22 protruding from below the action of its spring closes when the pressure at L is zero. This leads to the blocking of the printing cylinder.

If you now operate the pump, a pressure builds up in the device and increases to the pressure who is able to open the flap 22 via the flap 21

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to open. When 22 is open, the piston of the pressure cylinder performs a downward stroke under the action of the moment T. through and so creates a pressure drop behind its piston in the space with full cross-section as well as at of the flap 21 at the largest cross-section · The spring of the Flap 22 therefore pushes its ball back onto its seat

If the pump is operated further, the cabin can be completely swiveled. This phase of the pivoting is thus controlled by the pump

9 shows the position of the device when it is reset the cabin "

The pressure in the pressure cylinder is eliminated by opening the flap 13 and closing the flap 10. the The load to be returned is maximum at M and zero at L. When the pump is actuated, the pressure builds up in the annular space of the pressure cylinder and in the largest one Side of the first flap 9. The flap 12 is therefore opened and the rod of the piston returns into the pressure cylinder return.

Fig. 9 shows echematisoh the truck in the Cabin reset phase. If the vertical of the center of gravity G of the cabin in front of the articulation point B the cabin, the weight of the cabin exerts a tensile force F. on the pressure cylinder.

Fig. 10 shows the corresponding position of the device according to the invention.

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Venn the vertical of the center of gravity of the cabin behind runs along the hinge axis of the cabin, the load F tries to return the rod of the piston to the pressure cylinder ·

Since the pressure at L is zero, the flaps 22 and 12 shown open in FIG. 10 are closed.

With the flap 13 open, the pump is now operated until the pressure is sufficient to open the flap 12 via the flap 9. Opening the flap 12 enables the load causes a downward stroke of the rod of the piston. This creates a pressure drop in the annular space of the Printing cylinder generated. This pressure drop causes the flaps 22 and 12 to close, causing the piston of the Pressure cylinder is set · The pump is operated in this way until the cabin is in its normal Position is.

The pump can be a hand pump or a hydropneumatic one Be a pump.

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Claims (1)

Claims Γ I.jDevice for movement control by means of a hydraulic pressure cylinder controlled by a pump) e.g. for swiveling the cab of a truck », characterized by a non-return valve (12) in the bottom of the pressure cylinder (1) and a device to close the non-return valve (12) from At a distant point after opening a decompression flap (13) which is arranged near the pump (3), open which pump is used to control the outward stroke of the piston (20) of the pressure cylinder (i) by actuating the pump when the decompression hatch is closed. 2 · Device according to claim 1, characterized in that that the control device consists of a flap (9) «it different cross-sections, which are arranged in such a way that they open the non-return valve (12) opens when the liquid pressure of the pump (3) is only applied to the small area (s), and that means are provided to exert pressure on both surfaces when the decompression flap (13) is open and to exert pressure only on Exercise the small area when the decompression flap (13) is open. 3 · Device according to claim 1 or 2, characterized in that the device for controlling the Flap (9) bit of different cross-sections consists of two channels (8,11), of which the first, which opens onto the small area (s) of the flap (9), 109822/1140 205Q761 connected directly to the pump (3), and the second, which opens onto the large area (s) of the flap (9), either with the pump (3) or a collecting container (14), depending on whether the decompression flap (13) is closed or open. 4. Apparatus according to claim 3 »characterized by a Help flap (1O) that connects the two channels (8,11) and arranged in the extension of the decompression flap (13) and acting in opposite directions is formed, and by a displaceable transverse rod (15) »between the balls of the two Flaps (10,13) is arranged to close one flap when the other is opened. 5. Device for a double-acting hydraulic pressure cylinder, characterized in that the on the small area of the flap (9) with different cross-sections opening channel (8) a branch channel (16), which is connected to the end of the pressure cylinder (i) that is opposite the non-return "flap" (12), so that it is in the annular space (18) between the pressure cylinder (1) and the rod (19) of the Piston (20) opens. 6. Apparatus according to claim 5, characterized by a second flap (21) with different cross-sections, which in the branch duct (16) on which the first non-return valve (12) opposite end of the pressure cylinder (i) is arranged. 109822/11 AO Blank page