DE2022514A1 - Hydraulically operated telescopic jack - Google Patents

Description

Dipl.-Ing. G. Schliebs 61 Darmstadt- Ludwig-Büchner-Sfraßel4

Patent attorney phone (06151) 62928

Postal checking account: Frankfurt aM 111157 λ fl _as bank details: Deutsche Bank AG., Darmstadt

Telegrams: inventron

German Patent Office:

Munich 2
Zweibrückenstrasse 12th

Your reference Your letter My reference H 075 T <? 9 10o4.1970

^ ⁺ "-" ⁴ - "Tf ¹ Π" ¹ ^ "3" I —'niii Γΐι.Γπ-τΓ · * ίΤ "ητη? 1 filing

Applicant: Josef Haamann, Ireudenberger Winden- und Hoist factory, Freudenberg / Main,

Hydraulically operated telescopic jack .

The invention relates to hydraulically operated hoists and relates to a telescopic jack, which is first brought to its place of use, ie at the point of application of a load, for example a container, a swap bridge, a J ahrzeugaufbaus o Bolt or similar plug-in parts on the punch head of his lifting ram is snapped into a corresponding receptacle on the part to be lifted.

Such jacks are used for bulky loads such as larger ones Containers, four pieces required, which attack the four corners of the container. It is known that one and extending the punch heads from a device to effect which the devices for generating pressure and for control contains and via ^ e two lines to be connected to each of the four lifting jacks using hydraulic quick-release couplings, if in this way also the requirement of the, which is very important in practice One-man operation 'is apparently fulfilled, so only for

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the processes of lifting, holding and lowering a load, but not for the much more differentiated work steps of coupling and uncoupling the load from the jacks itself. These operations must be carried out individually at each load application point and assume that Each punch head is raised or lowered independently of the others, i.e. also by the central control can be.

In loading operations there is also often the need to leave a jacked up large container standing for a while. There are therefore several sets of four jacks in operation. On the other hand, it is unprofitable to have one for each set to keep their own equipment with pressure generator and control available, these should rather be used as required be actionable. This requirement results in new demands on the control, since the jacks on the one hand while under load, maintain their pressure independently of the pressure generator, but on the other hand by remote control as by Manual control should be both raised and lowered.

The object of the invention is to provide a iffnhgbnwen hydraulic l'eleskop lifting jack to train so that his The stamp is fed and moved via just two lines from a central facility and in its movements can be both purely hydraulically remote-controlled and manually controlled and its set state even when it is disconnected Central and under load for as long as you like.

There are hydraulically operated pit rams in the form of a ram foot, which are already preferably used in mining forming cylinder with a telescopically displaceable in this, the punch head forming hollow piston known,

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with an itfickschlagventil in the feed line to the cylinder, a pressure relief valve to protect against overload and an arbitrarily openable lowering or "Robbery" valve are installed. These pit punches are over Several feed lines are connected to a central pressure generator and also remain in the line stand under load until the pressure in the cylinder is released by opening the robbery valve directly by hand or off some distance is lowered by means of a rope.

A hydraulically operated ram of this type offers to solve the problem outlined above. According to the invention, the punch head is designed in such a way that that the plunger of the lowering valve is deposited within its guide in the housing and thereby forms an annular piston surface in an annular chamber, which via a The bore in the housing is to be connected to a further supply line for hydraulic fluid (control line). To this In addition, a stamp is created for a telescopic jack, from a central control device can be raised or lowered via just two lines and is at the set working height itself holds unless the pressure relief valve responds or the lowering valve is actuated.

To extend or raise the hollow piston - after the ram head has clicked into place in the receptacle of the piston to be lifted Part - is from the central control device over a control valve "lift" through the feed line from one Pump pumped hydraulic fluid pressed into the cylinder chamber. The return flow of the amount of liquid fed in is shut off by the check valve as soon as the Pressure in the feed line subsides, so that the lifting ram in its extended height hydraulically

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is locked and stops.

To lower the plunger or its hollow piston, the central control device uses a control valve "Lower" is printed through the further supply line of hydraulic fluid into the hanging chamber around the plunger of the lowering valve and applied to the annular piston surface on the plunger, so that the plunger moves and the lowering valve opens: Hydraulic fluid can be released from the cylinder chamber (bypassing the non-return valve) through the feed line (back to the tank of the pump in the central control device).

Independent of the remote control, however, the lowering valve can also arbitrarily by hand by operating a "robbery lever", which acts on its ram, can be opened, as is usual with pit rams, i.e. the jack can also be operated independently be lowered by the hydraulic system; Of course, there must be no pressure on the feed line during this time stand.

In order to be able to raise the jack of the jack arbitrarily by hand, as is the case when setting up and coupling is necessary at the load application point, is according to a further invention in or on the punch head behind the connection an arbitrarily closed pilot valve is arranged for the feed line and is normally open is. For execution, however, this pilot valve is closed and then the feed line is closed by the control device from pressurized by means of the "lift" control valve. By carefully opening the pilot valve, now the ram can be extended slowly and very precisely as required. This procedure can be carried out at each of the load application points with each of the lifting jacks standing there individually

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be performed. When all jacks are set up, the control valve is returned to its closed position and the gate control valves are opened again; the system is ready to lift the load and hold, move, or withdraw as needed.

In an advantageous embodiment of the invention, the ■ Pilot valve in or on the ram head of the jack is designed as a three-way valve that either provides the connection for the feed line or the connection for the control line with the cylinder space or a "connecting channel to this connects. With this improvement it is possible to lower the ram by hand by opening the lowering valve even when there is pressure on the feed line. With actuation of the pilot valve, the pressurized feed line is first shut off; the stamp does not move continue from. If then the lowering valve is also actuated the ram can also be lowered when the feed line is full.

Details and advantages of the invention are set out below explained using two exemplary embodiments, which are shown in the drawing are shown schematically; in this show:

f:

Pig. T a longitudinal section through a jack in the through the cylinder axis and the axis of the level laid in the punch head coaxially arranged one behind the other valves;

2 shows a section only through the punch head of a second embodiment in the illustration according to FIG 1 with a block diagram of the central control device

The lifting jack essentially consists of a lifting ram

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BADORJQiNAL.

with a cylinder 1, which is inserted into a support foot, not shown, and a hollow piston 2, which runs in a long guide in the cylinder and in whose head the valves are built, namely a check valve 4> a conventional spring-loaded ball valve, a pressure relief valve 5 » a common spring-loaded cone valve, a lowering valve 6 and a pilot valve 7. The check valve and pressure relief valve are coaxially located one behind the other and connected by a channel 81 in the plunger 8 of the lowering valve, namely the check valve in the plunger head 88 and the pressure relief valve closer to the end of the stem. The channel 81 communicates via a radial bore 82 with a chamber 9 _f in which the return spring 10 of the lowering valve is housed and which is connected to the spaces in the hollow piston and cylinder via a channel 31 in the punch head.

The plunger 8 of the lowering valve 4 is offset at its rear end 89 of the shaft, which is opposite to its head 88 and sealed with sealing rings 83 and 84 in its guide in the punch head 3. He kicks with the end of his shaft out of the head housing and is with the end face in front of an eccentric 11 which is about an axis 12 by means of a Hand lever 13 »of the so-called robbery lever, in a fork 32 of the Housing is stored.

With its seals 83, 84 and the valve seat 85 of the lowering valve 6 formed by its head 88, the plunger forms 8 three chambers in the housing 3, namely the already mentioned middle chamber 9, one around its offset shaft end 89 lying chamber 14, in which the shoulder of the stepped shaft forms an annular piston 86 and which has a Channel 33 in the punch head has connection to the outside, and a chamber 15 receiving the plunger head 88, which one after

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BATH ORIGINAL

■ outside leading opening 34 has.

To the stamp housing 3 and in front of the opening 34 · in the Chamber 15 is attached to the housing 77 of the pilot valve 7, the spindle 71 of which by means of the handle 72 in a thread 73 is axially adjustable and with her Valve cone the connection channel 74 from the connection socket 75 for a feed line P to the opening 34 shut off or can open.

Before the Pern or manual control of the start-up or the Lowering of the ram are described, is via the central control device ST for better understanding also mentioned that in it for the supply of four hydraulic jacks two parallel connected, from each other independent pumps P are provided. The pressure connections Both pumps branch out via the control valves StV on two jacks each. In doing so, of the four lifting jacks attacking a load, they are attached to one Front side opposite lifting jacks each from one pump fed The lifting and lowering movements of the two lifting jacks standing on one side, but on different front sides on the other hand must be controlled.

It can be seen without further ado that the check valve 4 the liquid trapped in the cylinder and piston chambers then also securely locked and the stamp his Load holds if at any point in the hydraulic system a leak occurs. Therefore it is also possible to use the jack at full load by loosening two quick-release couplings SK in the two supply lines P, R from the hydraulic system to separate, e.g. with the same control device ST and a further set of four jacks second large-capacity container and the like to be loaded.

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Remote control

When the control valve StV of the control device ST (cf. Pig. 2) indicated by dash-dotted lines is moved from a neutral central position to the "lift" position, the pump P driven by a motor M, for example an internal combustion engine, delivers hydraulic fluid from the tank T Via the feed line P via the normally open pilot valve 7 into the chamber 15 of the punch head 3 and from there, since the lowering valve 6 is closed, overcoming the check valve 4 through the channel 81, the radial bore 82 into the middle chamber 9 and from there through the channel 31 in the cylinder 1. The hollow piston 2 rises as a result of the pressure on its end faces as long as the valve StV is on "raise" or until the piston ring 21 rests against the inner shoulder 101 of the cylinder collar 102 ₀ When the pressure in If the cylinder threatens to exceed the permissible value, the overpressure valve 5 arranged behind the channel 81 in the plunger shaft 89 opens and the pressure is fed in e liquid flows through the radial bore 87 behind its valve cone 51 into the rear chamber 14 in the die head housing and from there through the channel 33 and a line R connected to the nozzle 76 back into the tank T without pressure.

In order to lower the ram, the control valve StV is brought into the "lowering" position, and the one conveyed by the pump P. Liquid is now fed into the chamber 14 via the line R and the channel 33 in the housing, where the The annular piston surface 86 is acted upon by the liquid pressure, so that the plunger 8 moves to the left. Through this opens the lowering valve 6, and the liquid standing in the piston and cylinder space can be removed from the one under load Piston 2 are pushed back through the chamber 15 via the channel 74 into the line P and through this into the

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Tank T flow.

Hand control ", '.'.

To raise the ram by hand, the pilot valve 7 is first closed by means of the handle 72. Then the control valve StV is brought into the "raise" position in the control device ST, so that fluid is under pressure via the line P on the pilot valve 7 that is now closed stands. By carefully screwing back the valve spindle 71 to a greater or lesser extent, the channel 74 is released to a greater or lesser extent, so that pressure fluid is fed into the cylinder space in the manner described _{above and the piston 2 rises} stopped at every piston position, and the piston is hydraulically locked in this position.

For central remote control (for common and simultaneous Control of several lifting jacks) the control valve StV is returned to its central position and the pilot valve 7 is then fully open

In order to lower the piston by hand, the lever 13 is pulled in the manner known from pit punches, whereby the eccentric 11 pushes the plunger 8 of the lowering valve 6 to the left pushes and opens the valve so that the liquid in the Cylinder and piston space under the weight of the piston into the chamber 15 and from there into the line P is pressed. However, this assumes that the line P is depressurized is why the control valve StV is in the "lowering" position must be provided.

This additional circuit measure on the control device ST is superfluous when training the

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Pilot valve as a three-way valve, as shown in Fig. 2 the drawing is shown schematically in the structure of the punch head 3 and arrangement of the valves and channels in it with those of FIG. 1 coincide. This pilot valve 7 'connects the opening .34 of the chamber 15 in the Housing 3 either with line P or with line R, whereby the passage to the other line is blocked in each case,

When the ram is stolen, the liquid is now removed from the cylinder and piston chambers by actuating the lever 13 can not flow off via the line P because this is blocked in the control device ST, so can without changing place the operator shut off the passage to this line by means of the pilot valve 7 'and the Passage to line R, which is open in the basic position of the control valve StV, so that the excess Cylinder liquid can flow off through this line.

The embodiment of the invention is not limited to the two shown and illustrated exemplary embodiments, in particular the arrangement and design of the individual Valves may be of a different kind, although preference is given to the coaxial arrangement of the valves because it makes one special small building punch head leads and in particular for the use of a conventional, hydraulically operated Pit punch is suitable, on the head of which only the pilot valve has to be attached, while the shaft of the Lowering valve plunger must be set down to form an annular piston. But you can also see that the pilot valve not necessarily sit in or on the punch head, but only hydraulically connected to its feed opening must be ο

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BATH ORIGINAL

Claims (1)

'\' Patent claims Hydraulically "" moved telescopic jack with one Stamp "forming cylinder and a displaceable in this, the stamp head carrying hollow wedge wherein in the Ram head in the connection from the connection of the feed line to the cylinder has a check valve, a pressure relief valve and a lowering (robbery) valve that can be opened at will are installed, characterized in that the plunger "(8) of the lowering valve (6) within its guide is deposited in the punch head housing (3) and an annular piston surface (86) in an annular chamber (14) which has a Channel (33) in the housing led out to a connection (76) for a supply line for the hydraulic fluid (control line R) is. Telescopic lifting jack according to claim 1, characterized in that in or on the punch head housing (3) behind the connection (75) for the feed line (P) an arbitrarily closed one Pilot valve (7, 7 ') is arranged. Telescopic lifting jack according to claim 2, characterized in that that the pilot valve (7 ') is designed as a three-way valve, which either the connection (75) for the feed line (P) or the connection (76) for the control line (R) with a check valve (4) und.Absenkventil (6) receiving Housing chamber (1.5) connects. 1 0 988 3/07