DE1128383B - Hydraulic pit ram - Google Patents

Description

A fully hydraulic pit ram to which the hydraulic fluid is controlled by a high-pressure pump is supplied, three functions fall, namely an automatic setting, an automatic Robbery and, in the event of overload, automatic lowering of the outer ram.

The object; The invention relates to adjustable hydraulic ram with on the principle of a Pressure relief valve working safety valve for the passage of the hydraulic fluid and a valve for the inlet of the pressure fluid when setting the ram as well as a valve for the outlet of the Hydraulic fluid for robbery, consisting of a cylinder that serves as a cylinder for an inner punch Outer plunger, the inner plunger consisting of a hollow piston rod, which is used for the hydraulic fluid receives the required inlet and outlet line, is formed, in conjunction with a piston-like Head.

In the known valves are setting valves, robbery valves and the check valve as a pressure relief valve so summarized in the construction to a totality that in the event of malfunctions or Failure of one of these elements calls into question the response of the other elements. This moment the related uncertainty must be viewed as a disadvantage.

Pit punches are also known that have the same functions of setting, Robbery and Overload ”contain, but constructively the function of placing and robbing in their Wear entirety, the function of the pressure relief valve, however, is separate.

In these designs, two pressure lines have been provided, one pressure line for setting and another pressure line for robbery. However, both lines control only one Double piston valve that feeds the hydraulic fluid to the valves in question.

It is now used for a hydraulic pit ram with a piston rod designed as an inner ram, in this arranged supply and discharge lines for the pressure medium and attached in the piston Non-return or set, overpressure and robbery valves proposed according to the invention that the non-return or setting valve and the associated supply line for the pressure medium lie in the stamp axis while the robbery valve and the pressure relief valve are arranged off-center. The robbery valve is in the axis a second conduit.

The robbery valve is designed as a piston valve whose working piston has a bore with a Hydraulic pit ram

Applicant:

Hoesch Aktiengesellschaft,
Dortmund, Eberhardstr. 12th

Dipl.-Berging. Waldemar Tomeezek, Dortmund,
has been named as the inventor

Line pipe for the hydraulic fluid is connected, and the two line pipes are through a dem Stamp pre-built control element used alternately as inlet or outlet pipe.

As a further characteristic it poison that the lower one Part of the piston-like head of the inner punch is tapered and has a smaller diameter as the upper part and that there are also horizontal bores to the valves, so that the hydraulic fluid in both overload and robbery from the upper pressure chamber in the Counterpressure chamber can penetrate and that there is a horizontal bore below the robbery valve is located, which when robbing the outflow of the pressure fluid from the upper pressure chamber in the central Line pipe permitted.

The individual functions are summarized again below: When setting the stamp only the setting valve in the form of a ball check valve is actuated. The hydraulic fluid is Enter here, fill the pressure chamber of the outer punch and, when the setting load is reached, it will operate automatically conclude.

If the nominal load of the ram is overloaded, only the pressure relief valve and the hydraulic fluid are stressed can escape unhindered through the return line.

When the ram is stolen, the hydraulic fluid first becomes the spring chamber of the pressure relief valve fill, at the same time lift the robbery valve designed as a pressure piston through an annular channel and once in the back pressure chamber, on the other hand through the return line.

The advantage of the proposal according to the invention is therefore seen in the fact that both the setting valve, the pressure relief valve as well as the robbery valve in their

209 577/81

Function are arranged independently of each other, so that when the stamp is overloaded the activity the pressure relief valve secured, a destruction of the stamp is not given and also of the function stealing independently of setting, and finally, independently of the function of stealing and the function of overloading, the setting of the Stamp is possible.

A very particular advantage of this invention over the other known arrangements must but can still be seen in the fact that by the Separation of the two functions that affect the setting valve and the robbery valve, the closing time of the Setting valve, which must be kept very briefly in any case, is justified and, on the other hand, freedom from malfunctions is greater than when two valves work together. It has been proven in practice that that existing valves, due to longer closing times, greatly reduce the uniformity of the set load influence and thus not the required equal setting load within a closed extension front is secured.

In the figure, an embodiment according to the invention is shown schematically, namely this gives a longitudinal section through the in the as Inside stamp housed valves again.

An inner punch 1 is provided with a piston-like head 2 which is guided in an outer punch 3 is. When the stamp is set it opens with the help of a high pressure pump between the stamp switched on (not shown) control a pressure medium via a pressure line 4 a setting valve (Check valve) 5, so that the pressure fluid enter an upper pressure chamber 6 and the outer ram can put.

When the robbery is applied by switching the control, the pressure medium in a line 7 and through an annular channel 8, a piston 9 of a robbery valve. The spring force of a spring 10 overcomes the pressure on the robbery valve and gives the Return for the pressure medium located in the upper pressure chamber 6 through a channel 11 into a counter pressure chamber 13 free or the pressure medium can now use line 4 and exit.

If the nominal load limit is overloaded by the rock pressure of the hanging wall, a pressure relief valve is activated 12 address. The pressure medium flows through the channel 8 into the line 7 and through it at the same time the channel 14 back into the counter-pressure chamber 13.

After the stamp has been set, the control is brought into a neutral position in which the pressure medium after overload through the pressure relief valve 12 and the line 7 can flow back freely. Even though In the present invention, there are three separate functional elements that act independently of one another are used for the operation of the stamp (setting, robbery and overloading process) only two pressure lines required. The pressure line 4 shown according to the drawing is arranged so that they are attached to the central axis directly by a trapezoidal one placed on the lower punch tube 1 Pressure piece (not designated) is introduced into the valve piston 2. The off-center Pressure pipe 7 is also through the (not designated) trapezoidal pressure piece in the robbery valve of the valve piston introduced. The ring channel 8 milled into the valve body represents when it comes into force the effect of robbery or overloading is a connection to the pressure pipe 7. In addition, through the annular channel 8 and the transverse channel 14, the application (robbing the punch) of the lower pressure chamber 13 through the pressure pipe 7 is possible. By applying the pressure medium in the pressure pipe 4 is the setting process or emptying of the pressure medium from the setting valve 5 Pressure chamber 13 possible via the transverse channel 11.

Due to the arrangement according to the invention, there is once a central loading of the upper punch and, on the other hand, a diametrically opposite loading of the annular space 13. Both measures prevent unilateral exposure and thus close every possibility from that the upper punch tilts. It can no longer bend or jam. The ring channel with the two lines 11 and 14 is of particular importance for this.

Claims (3)

PATENT CLAIMS: 1. Hydraulic pit ram with piston rod designed as an inner ram, in this arranged supply and discharge lines for the pressure medium and mounted in the piston check or setting, overpressure and robbery valves, characterized in that the check or setting valve and the associated supply line for the pressure medium in the ram axis, while the robbery valve and the pressure relief valve are arranged off-center. 2. Hydraulic pit ram according to claim 1, characterized in that the robbery valve lies in the axis of the other conduit pipe. 3. Hydraulic pit ram according to claim 1 and 2, characterized in that the two conduits by a control element built in front of the stamp alternately as a supply or Drain pipe can be used. Considered publications:
German Auslegeschrift No. 1013 245,
1048 852. For this purpose, 1 sheet of drawings © 209 577/81 4.62