DE1189938B - Hydraulic pit ram - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

E21d

German class: 5 c -10 / Θ1- ff / t-

Number: 1189 938

File number: K 47631 VIa / 5c

Filing date: August 31, 1962

Open date: April 1, 1965

The invention relates to hydraulic jacks of the so-called open system, i. H. those in which the pressure medium is not inside the ram as with the older hydraulic rams is pumped from a storage space in a pressure space S, but the stamp in each case Set is filled with the required amount of hydraulic fluid, which flows out freely during the robbery process.

In the known hydraulic rams of this type, it is known and customary for the entire valve arrangement for the operation of the punch in an as such independent of the inner punch tube, to accommodate exchangeable body in its interior. On the other hand, such are hydraulic Pit punch not free from disadvantages. The block carrier, which is inserted into the inner punch is, must rest on an inner paragraph of the inner stamp, which requires that the inner stamp in his the upper area has a much smaller wall thickness. In addition, the one to be picked up by the stamp Pressure from the punch head via the valve block on this shoulder and thus on the lower punch transfer. This is disadvantageous because it can easily damage the valve block.

It has also been proposed to use a block body containing the bores for the valves to use in the outer die, however, this makes it necessary that this block body directly is connected to the punch head.

The disadvantage that the valve assembly is exposed to dangerous stresses because of the Stamp head absorbed load that the stamp has to carry over that containing the valve arrangement The area of the inner punch is introduced into the punch, a third of the known ones must also be used Stamp constructions are attributed, in which the valve arrangement in a particular Component is housed, which as such forms a load-bearing part of the outer die.

The invention provides a hydraulic pit ram in which the entire valve arrangement is housed in a body inserted in the inner punch tube in a known manner, In which, however, a novel arrangement ensures that extremely easy accessibility and ability to operate the valve assembly without any risk of clogging is given and in particular the attachment point of the block containing the valve assembly depending on Expediency can be chosen arbitrarily, since no outwardly protruding parts at all Inner punch tube are present, its entire hydraulic pit punch

Applicant:

Klöckner-Werke Aktiengesellschaft, Duisburg

Length for setting the stamp can be used without the entry path due to protruding parts the inner punch would be limited.

The invention achieves this according to its basic idea in that the inner punch tube independent, the pressure loads exerted on the stamp body one with openings of the inner punch tube has aligned through transverse bore into which the at the same time the Function of the robbery and filling valve fulfilling main valve opens, which is on one side of the Cross hole The hole in the body to be located with the through cross hole and another one Bore of the body is connected to the pressure chamber of the punch and the valve body is with an approach on which the robbery key inserted into the bore acts, extends into the bore.

The mentioned further bore of the body normally ends in the usual, in the pressure chamber the pipe leading to the outer punch.

According to the invention, a pressure relief valve of the usual type is in a further bore in the body, which is in connection with the pipe leading to the stamp space after the said pipe is provided, Via which through an outlet-side bore the drainage when the rated load of the punch is exceeded Liquid, be it in the above-mentioned transverse bore or in the cavity above the die Valve assembly receiving body escapes.

According to another embodiment, this can lead to the pressure chamber of the outer die Tube come in failure. This only requires that the body that receives the valve assembly against the interior of the inner stamp, which is then also filled with the pressure fluid, in an appropriate manner Way is sealed.

The above-described design of the new stamp or that of the invention According to a further advantageous feature of the invention, valve arrangement also enables use a much simplified set pistol, to which because of the radial course of the Cross hole into which the setting gun is inserted

509 537/69

is now not after the filling valve leading hole during the filling process, as in known constructions, an axial pressure acts, which tends to push out the setting gun. In principle, needs the setting gun to consist of nothing more than an appropriate radial bore having, at the end closed tube, which through the bore of the inner punch tube in the through hole inserted and with the radial confluence of the after the filling and robbery valve leading channel is brought into congruence.

Obviously, the hydraulic fluid acts via this radial channel instead of pushing it away into the setting gun in them additionally holding, namely pressing against the bore wall sense.

The details and further features of the invention will emerge from the following description an embodiment of the new stamp on the basis of the images of which

A b b. 1 shows an axial section through the punch with the setting pistol in the ready position,

A b b. 2 shows a horizontal section through the body receiving the valve arrangement along line AB of A b b. 1 and

A b b. 3 also shows a section through the body along line C-D of A b b. 2 represents.

In the figures, the inner punch is designated with α and the outer punch connected to it by the collar c with b. The inner die carries the usual removable head plate d.

The cylindrical body e , which receives all of the components belonging to the valve assembly and which is in the inner punch, for. B. by dowel pins / penetrate the bores of the inner punch and extend in recesses g of the body e , is attached. The recesses g must have such a width that it is possible to drive the dowel pins / through the bores receiving them into the interior of the recesses for the purpose of loosening the body e .

The body e has a through bore i aligned with the openings h ', h " of the inner punch tube α , into which a channel k formed by a further bore opens which leads to the valve which simultaneously forms the filling valve and the robbery valve.

On the outlet side of this valve, the channel m, which is also formed by a bore in the body and, according to the illustrated embodiment, is connected to the pipe η leading to the pressure chamber of the lower ram, extends from it.

In a further hole in the body e , the z. B. housed by a valve cartridge formed as such a pressure relief valve ο , on the one hand through the bore ρ with the channel m and on the other hand, be it with the bore i or the free space above the body e in a manner not shown in detail.

The setting gun q is in A b b. 1 for the sake of clarity shown in the non-inserted state. It consists of a tube closed at the end, which has a radial bore near its end which can be brought into alignment with the channel k , the extent of the introduction of the gun barrel being secured by an appropriate stop in the bore /. According to a further feature of the invention - as shown - the setting gun can be equipped with a valve arrangement to be actuated simultaneously by a lever r - a return valve s' and a filling valve " Hydraulic fluid line open and the vent closed, and vice versa.

The operator can therefore use and operate the setting gun with one hand, as well

ίο lose weight again, which is particularly important when using of the stamp is inclined because the man now has his other hand free to hold on.

To steal the ram, ie to drain the necessary amount of pressure fluid, only an eccentric robbery key needs to be inserted into the bore i , the rotation of which and consequently the effect on a shoulder of the valve body opens the valve.

The mode of operation of the new valve arrangement does not require any further explanation hereafter, just as it can be seen that the entire valve arrangement is now free from all stresses and is no longer subject to any risk of contamination. Rather, it cleans itself automatically by the liquid flowing back when the ram is stolen, which rinses the bore / and frees it of impurities that could penetrate through the openings h ', h "of the inner ram tube.

The embodiment of the new punch which results when the tube η is dispensed with, ie the sealing of the body ρ against the circumference of the inner punch tube which is then necessary does not require any further explanation.

Of course, the invention is not limited to those described in detail above and in the Embodiments shown are limited, but changes are made possible without deviating from their basic idea.

For the features of the subclaims, patent protection is only granted in connection with the main claim desired.

Claims (7)

Patent claims: 1. Open system hydraulic pit ram, the entire valve arrangement of which is in housed as such in the interior of the inner punch tube replaceable body is, characterized in that the pressure loads exerted on the punch, which are independent of the inner punch tube withdrawn body a continuous flush with openings in the inner punch tube Has transverse bore in which the simultaneously fulfilling the function of the robbery and filling valve The main valve opens via a bore to one side of the transverse bore of the body with the through-going transverse bore and connected to the pressure chamber of the punch via a further bore in the body is, and the valve body is with an approach on which the into the bore introduced robbery key acts, extends into the bore. 2. Hydraulic pit ram according to claim 1, characterized in that it is preferably designed as valve cartridge pressure valve also housed in a bore in the body and to which the robbery and Filling valve is connected to the channel connecting the pressure chamber. 3. Hydraulic pit ram according to spoke 1 and 2, characterized in that the the interchangeable body accommodating the valve assembly without sealing against the Inner punch tube is held in this and the connection of the common filling and robbery valve with the pressure chamber in a manner known per se by a one extending after this Tube takes place. 4. Hydraulic pit ram according to claim 1 to 3, characterized in that the Body through radial bores in the inner punch tube and aligned with these Bores in the body, which open into recesses of the same, detachable extending dowel pins is attached. 5. embodiment of the hydraulic pit ram according to claim 1 and 2, characterized in that that the body is sealed against the inner circumference of the inner punch and the Downstream bore of the robbery and filling valve in the then pressurized interior of the Inner punch opens. 6. Set gun for pit punches according to claim 1 to 5, characterized in that it has an end-closed approach with a radial bore, which is in a position limited by a stop in which this bore with the leading to the robbery and filling valve channel of the Body (e) is connected, can be inserted into the through-going transverse bore of the body. 7. setting gun according to claim 6, characterized in that that it is provided with a vent and an opening valve, which at the same time and can be operated in opposite directions together by a single operating lever. Considered publications:
German Patent No. 919 525;
German interpretative documents No. 1047 150,
733, 1075 074;
British Patent No. 767 561. 1 sheet of drawings 509 537/69 3.65 © Bundesdruckerei Berlin