DE2829664A1 - Coal mine pneumatic backfilling with advancing support - has walling moved at times and extent differing from pneumatic lead - Google Patents

Abstract

The pneumatic duct fitted to a mobile support is intermittently moved in the direction of advance, in the pneumatic packing process used in underground pit working particularly coal mining. A pneumatic wall unit (19), or its component parts (20) are motor driven to move forward at different time intervals, and to a greater extent each time, than the duct (17), or to a greater extent than the support elements (5) at each step. This integrates pneumatic back-filling and staged support forwarding.

Description

Blow backfilling process for underground mining operations and

Means for performing this method prior art Es numerous blow molding processes have become known. In a known blow batch process the blown material is behind by means of soft-like discharges from the side of the blow line discharged a blow wall, which because of the relatively sharp deflection of the blown material flow high wear of the discharges from the flow direction into the discharge direction connected is. In addition, the filling of the offset field is not uniformly good to accomplish, because the discharge direction practically only through the soft-like Austräge is determined (DE-AS 18 12 365; Mehrhoff and Voss: The future meaning of the full backfill for the German hard coal mining industry. Happy April 1st 1976. DE-AS 23 24 877; DE-OS 1 907 219).

Blowing processes are also previously known in which the blown material is pre-headed from a blow pipe that can be separated into pipe sections and can be advanced one shot at a time a blow-off wall emerges.

OBJECT The invention is based on the object of a method to integrate the blow offset and step extension.

The process should be economical with simple means carry out permit. Furthermore, the invention is based on the object of implementing one of the process to create suitable equipment with simple, robust construction Funds and is particularly suitable for use in underground hard coal mining suitable.

Solution of the task with regard to the method This task is solved by the features reproduced in claim 1.

Advantages of the fact that the Blasversatzwand in other time intervals is advanced in the direction of the mining progress, it is possible to adjust the offset field width to be determined larger than this corresponds to the extent of a step by which the expansion elements progress in the direction of the dismantling front. When using the invention During the process, the blow-off wall does not need to be advanced every time. when the expansion elements migrate. Rather, it is possible, for example, to use the blow offset walls only after every second step that the extension elements move around or after one larger number of steps by which the extension elements move or

after a larger number of steps by which the expansion elements are advanced, also in dismantling line to advance motor-driven. In this way you have it practically in your hand to determine the offset field width. Also wears the motorized movement of the blow-off wall for the further mechanization of the longwall construction at.

Further embodiments In claim 2 is a particularly advantageous one Procedure described in which the Blasversatzwand or the individual Blasversatzwandteile by a significantly larger amount than the blow line or the Extension elements are advanced in the dismantling direction as they move forward, for example be advanced by twice or more the amount, around which the expansion moves step by step. That means that after advancing the blow-off wall or its blow-off wall parts behind these advanced blow-off wall parts an offset field is available whose width z. B. twice the increment by which the expansion moves with each advance.

Claim 3 is a detailed teaching on the planned and technical Action described, which is of particular advantage in underground hard coal mining can apply.

Solution of the task in terms of the establishment This task becomes solved by the features reproduced in claim 4.

Some advantages The device according to the invention enables Use of an extension, which is characterized by its good and spacious accessibility which is possible both in front of, between and behind the stamps.

Further embodiments In an embodiment according to claim 5 results a reliable, robust construction between the blow-off wall and the extension elements, alternately on both sides with pressure medium - primarily a suitable one Hydraulic fluid 'loadable piston-cylinder units (push piston gear) on the one hand enable reliable support of the blow-off wall parts, if this is held at a distance from the expansion elements against the blown material when the expansion elements advance. On the other hand, the Blasversatzwandteile through this thrust piston gear advance safely in the mining direction, the amount by which the blow-off wall parts are advanced within more practical Limits can be kept practically any size, especially if in the geared Coupling chain further transmission links, for example telescopic tubes and / or extendable canopy and sole parts are switched on.

In the embodiment according to claim 7, the blow offset wall parts Move forward without any problems even with uneven or swelling beds, because the individual Blasversatzwandteile adapt to a certain degree of unevenness capital. The blow-off wall is also divided into several or one A plurality of Blasversatzwandteile the successive advancement of the expansion elements opposite.

The embodiment according to claim 8 is particularly advantageous.

This is because it is possible to use the two at the top in the area of the caps lying thrust piston gear to extend differently to the relevant Blow offset wall part to pivot about a vertical axis. This allows the blow-off wall be adjusted depending on the overturning, especially if according to claim 9 the thrust piston gear articulated with the expansion elements and the Blasversatzwandteile are coupled. This coupling can be gimbal or via universal joints, whereby it is not necessary in all cases to have at both ends of the thrust piston gear, that is, cardanic joints on the expansion elements and on the Blasversatzwandteile to be provided. Rather, it can be quite advantageous in individual cases if the thrust piston gear are coupled to the extension elements so that they can be articulated via horizontal axes, while with the Blasversatzwandteile via universal joints or cardanic - also indirectly - are in connection (claim 10).

In the embodiment according to claim 11, a stable one results Storage for the blown wall parts.

In claim 12, a further alternative solution is described in which the Blasversatzwandteile in guide slots of the caps - possibly indirectly - are performed.

A particularly advantageous embodiment is described in claim 13. This embodiment is particularly suitable for use in struts with sloping Storage, for example for use in struts up to 20 gon tipping. Included the individual blown wall parts can be placed in the upper and lower suspension Pivot and adjust to a limited extent according to the overturning. In addition, the Stabilizing cylinder in the area of the caps to form an extension team coupled support frames, dispensing with complicated lemniscate guides for a stable arrangement, the stroke of the stabilizing cylinder by the for the necessary amount of overturning is greater than the relevant rear cylinder, through which the support frames are connected to a face conveyor.

According to claim 13, the back and stabilization cylinders move of the respective expansion team synchronously.

This synchronous operation is in the embodiment according to claim 16 achieved in that the cylinder spaces of the respective rear cylinder and the stabilizing cylinder alternately on both sides - depending on which of the extension frames of an extension team progresses - pressure medium conducting, in particular liquid conducting - with each other are connectable, each of the back cylinder during the movement of its piston The amount of pressure medium displaced is identical to the amount of pressure medium used by the stabilizing cylinder during its synchronous running ~ from the rear cylinder swallows (absorbs).

In claim 15 is an alternative solution for the arrangement of the thrust piston gear described, which couple the Blasversatzwandteile with the expansion elements.

If the device is designed according to claim 16, so can The blow line can not only be adjusted in height in a simple manner and also to a limited extent Swivel angle measure, but it is also ensured that otherwise local overstressing of the pipeline through the communicating connection of several piston-cylinder units For example, the cylinders of one can be balanced over the other Communicating pipe section, in particular connected to one another in a hydraulic fluid-conducting manner be. In addition, it is possible for each of the piston-cylinder units to have a pressure relief valve to be assigned to the pressure medium in the event of overstressing can leak. In all cases, the pipeline is spared.

In claim 17 is a further advantageous embodiment for Formation of the Blasversatzwandteile described.

The flexible apron can be made of suitable rubber-like properties having elastomers exist, the one hand the gap between two consecutive Blown backfill wall parts to prevent the mountains from falling into the face, on the other hand, the skirt can act as a hinge between the blow-off wall parts act to make them pivotable to the required extent.

In the drawing, the invention is based on exemplary embodiments - in part schematic - illustrated. Show it: Figures 1 to 6 schematic Longitudinal sections through a longwall, with the expansion according to the progress of the mining is arranged differently; FIGS. 7 to 10 belonging to FIGS. 1 to 6 schematic cross-sections through the strut; Figure 11 is a cross section through a Streb in a further embodiment; FIG. 12 is a partial plan view of FIG. 11; FIG. 13 shows a partial side view of FIGS. 11 and 12 when the angle is inclined Storage and tipping; FIG. 14 shows a hydraulic circuit diagram of an expansion trailer according to the invention; FIGS. 15 to 17 show the arrangement of blown wall parts schematically in plan view.

In the drawing, the reference numeral 1 denotes in each case a longwall, while 2 is the mine face. A face conveyor is parallel to face 2 7, for example a scraper conveyor, arranged that the mined mineral promotes in direction X to route 4b, which is arranged opposite the supply route 4a is.

With the reference numeral 5 expansion frames are designated, which in the illustrated embodiment each consisting of a cap 6 and a sole piece 7 and four jointly arranged between them, in particular by a suitable one Hydraulic fluid alternately acted upon on both sides punches 8, 9, 10 and 11 exist. The joints through which these punches 8 to 11 are articulated can Be space joints.

Each expansion frame 5 is in the illustrated embodiments by alternating one on both sides with pressure medium, primarily a suitable one Hydraulic fluid, acted upon back cylinder 12 - directly - with the channel shots of the face conveyor 3 coupled. It is in the illustrated embodiments the arrangement made so that the cylinder tube 13 of the rear cylinder 12 with the formed as a lying runner sole piece 7 is immovably connected, while the piston rod 14 can be articulated with the relevant walker rods 15 over Intermediate pieces on the face conveyor 3 is in connection. In the embodiment from In FIGS. 11 to 13, the piston rods 14 can each be articulated to an intermediate piece attached, which in turn via horizontal pivot axes on the walking frame 15 and the channel section in question is hinged. In addition, every second walker bar is 15 in the embodiment described, an alternating pressure medium on both sides, if necessary, in particular hydraulic fluid, associated with loadable piston-cylinder unit 16, the end facing the lying person via a ball joint in the walker bars 15 and is supported at its other end on an abutment of the channel section in question, such that this piston-cylinder unit 16 forms an acute angle with the horizontal includes.

As can be seen in FIGS. 1 to 6, the line 4a is one Blow line 17 composed of pipe sections is brought into the face 1. the end this blow line 17, the blown material head is discharged. According to the progress of the dismantling the individual pipe sections are advanced and by couplings 18 at the front coupled together. The couplings 18 are designed such that a separation of the pipe string 17 in individual parts is not required.

All elements of the blow line 17 are on the working face side in front of a Blow offset wall 19 is arranged, which consists of several blow offset wall parts 20.

The blow line 17 is suspended from the black 6 by chains 21 and by hydraulically operated piston-cylinder units in the direction of the mining progress advanceable.

As can be clearly seen from FIGS. 12 and 14, the expansion racks are 5 coupled together in pairs to form extension teams. For this purpose are in the area of the sole piece 7, a plurality of link elements 22, 23 and 24 are arranged such that they can move in an articulated manner. The link elements 22 and 24 are in the embodiment shown as alternating on both sides pressurized with pressure medium, primarily a suitable hydraulic fluid Piston-cylinder units formed, the cylinder at the joint of one Extension frame and the piston rod each to a corresponding joint of the other Extension frame are arranged immovable. The link element 23 is against it rod-shaped. In this way it is possible by applying the appropriate pressure of the link elements 22 and 24 with pressure medium to direct the support frames.

The caps of these two neighboring support frames are also with link elements 22, 23, 24 and a stable top cylinder 25 (Fig. 14) Coupled with one another so as to be able to move in a walking distance, this stabilizing cylinder 25 extends with its longitudinal axis in the direction of the mining progress, i.e. parallel to the longitudinal axes of the two support frames 5 coupled to one another, the cylinder tube 26 of the Stabilizing cylinder 25 via an immovable joint 27 - possibly with the interposition further link elements or abutments - with the cap 6 of one extension frame 5 and the piston rod 28 by a likewise immovable joint 29 - possibly also with the interposition of further link elements or intermediate abutments - Is coupled to the cap 6 of the other extension frame 5. 30 denotes the with the piston rod 28 immovable as well as longitudinally displaceable and sealing in the cylinder tube 26 guided piston, which alternately on both sides with pressure medium, primarily a suitable hydraulic fluid can be acted upon. How it works will be below will be described in detail later.

The Blasversatzwandteile 20 are - as from the drawing, however is not so clearly evident - arranged at a distance from one another (Fig. 15 - 17)., In some of the embodiments shown, the gap is created by a stiff Apron made of steel and a flexible apron made of a rubber elastic properties having elastomers bridged.

The Blasversatzwandteile 20 can over a removal gesture 'or via several expansion racks, for example via an expansion team or extend three support frames (Figures 15 to 17). In Figures 15 to 17 is the flexible apron is designated by the reference numeral 31.

The blown spare wall parts 20 are - which can be seen from FIG. 11 - In the embodiments shown, each is equipped with a horizontal runner 32 and by alternately using pressure medium on both sides, primarily a suitable hydraulic fluid, loadable piston-cylinder units 3 also adjustable in height. The piston-cylinder units 77 are arranged on the mine face.

In addition, each blown wall part is in the area of the horizontal runner 7 in the illustrated embodiments duroh one alternately on both sides Pressure medium, primarily a suitable hydraulic fluid, can be acted upon Piston-cylinder unit (push piston gear) 34 connected to both the horizontal runner 7 as well as on the relevant Blasversatzwandteil 20 articulated, for example by universal joints, is articulated, the thrust piston gear 34 are in the from the Figures 7 to 10> apparent embodiments as continuously extendable Parts of the. Sole piece 7 shown, while in the embodiments according to the FIGS. 11 to 13 clearly show the thrust piston gear 34 as piston-cylinder units can be seen. The joint axes 35 and 36 are also particularly clear from FIG. 11 recognizable.

Below the cap 6 of each expansion frame 5 are two with each their longitudinal axes parallel and spaced apart, likewise alternately on both sides with pressure medium, also primarily a suitable hydraulic fluid, actable piston-cylinder units (push piston gear) arranged by which in Fig. 11, however, only the thrust piston gear 37 is designated in more detail.

The longitudinal axes of this thrust piston gear 37 run parallel to the longitudinal axes of the relevant expansion frames, i.e. in the direction of the progress of the dismantling. Each thrust piston gear is articulated at both ends, wherein the telescopically mutually displaceable parts of the thrust piston gear Each via special joint axes, primarily universal joints, on the one hand with the Cap 6 and on the other hand with the Blasversatzwandteil 20 are connected.

These joints are shown in Fig. 11 with the reference numerals 38 and 39 for the thrust piston gear 37 denotes. This way you can go through differently the push piston gears 37 articulated in the region of the caps 6 are extended far the relevant Blasversatzwandteil 20 about a vertical axis to a limited Swivel measure. This means that it can be adjusted, for example, depending on the overturning will.

The joints 38 and 39 are below the cap 6 in SchlitzführunguqF en slidably guided parallel to the longitudinal axis of each extension frame. These are the joints 38 and 39 in the embodiment according to FIGS. 11 to 13 in slides stored, for example, with projections not shown, for example in the manner of a dovetail guide, engage in the slot guides. on in this way it is possible to move the Blasversatzwandteile 20 in the direction of the Abaufortschriftes to adjust or to advance and to secure them against lateral displacement The chains 21 are in each case alternately by means of pressure on both sides - primarily a suitable one Hydraulic fluid - assigned piston-cylinder units 40 that can be acted upon, the on the blow line 17 are attached horizontally. These piston-cylinder units 40 can also be referred to as a holding and height adjustment cylinder. Several of these Holding and height adjustment cylinders 40 are communicating, i.e. they conduct pressure medium, connected with each other. This avoids overstressing the blow line 17 In addition, a pressure relief valve (not shown in detail) is assigned to each cylinder 40, which opens freely into the longwall, so that the pressure medium in the event of overpressure can flow out to the outside.

In Fig. 14, the letter P is an to a not shown Pressure medium source, for example a motor-driven hydraulic pump connected Pump line denotes, while R represents the return line leading to a Pressure medium container, in particular to a liquid tank, leads. Shown are three reversing valves designed as multiple valves for each expansion combination 41, 42 and 43, which can be operated by hand levers. In Fig. 14 are all the hydraulic parts of the circuit diagram in its zero position. For example, this will be Reversing valve 41 in its marked by diametrically opposed arrows Switch position brought by operating his hand lever, so flows with this Embodiment hydraulic fluid via a line 44 into a cylinder space 45 of the associated return cylinder 12. The hydraulic fluid in the annular space 46 is thereby from the piston 47 via a line 48 and a releasable check valve 49 is pressed into a line 50 and from here into a line 51 and arrives in the annular space 52 of the stabilizing cylinder 25. This is from the annular space 46 displaced pressure medium volume dem'vom the annular space 52 during the displacement of the piston 30 recorded pressure medium volume identical. In this way there is a synchronous operation of the rear cylinder 12 and the stabilizing cylinder 25 reached.

This means that the support frame 5 in the direction of Cen face conveyor 3 is pressed, while the cap 6 by the stabilizing cylinder 25 also is taken in the direction of the dismantling front 3.

The valve 42 serves inter alia. in addition, any leakage losses in the stabilization cylinder 25 balance. In addition, the stabilizing cylinder can be operated via valve 42 25 set by extending it to a greater or lesser extent depending on the tipping over will. In addition, the valve 42 can be used to straighten the stroke (or walking direction) possible.

The amount of pressure medium displaced from the annular space 53 flows over the Lines 54, 55 and 56 to the check valve which can be unlocked via line 57 58 and then flows into the reflux line R. The function of the other extension frame 5 associated rear cylinder 12 and the stabilizing cylinder 25 with these Lines assigned to elements are accordingly.

The sequence in the mining process and the blow-back process is as follows: Figures 1 and 7 show the starting position. Here are the expansion frames 5 aligned, backfill 59 is blown in, an extraction machine 60 - here a cutting masclline -.

begins to gain mineral.

In the position of FIGS. 2 and 8, the support frames 5 move behind the mining machine 60 a step T in the mining direction V before. The blow pipe 17 and the blow offset wall 19 hold their positions shown in FIG. 7 Extending the associated thrust piston gear 37 and 34 or the extendable cap and sole piece parts in FIGS. 8a and 8b.

In the position of Figures 3 and 8, the blow guide 17 is in their whole length 1 separated in direction V by the increment T motorized advanced by the thrust piston associated with the blower line 17 been.

In the position of Figures 4 and 8, the support frames 5 are braced. The face conveyor 3 is advanced by the increment T in the direction V. The extraction machine 60 begins to gain mineral.

As can be seen in FIGS. 5 and 9, the lower support frames are here 5, in which no blowpipe is hanging, with the blow-off wall or parts of the blow-off wall 20 moved forward by increment T in direction V. In addition, the blow-off wall parts were 20 also by the increment by applying appropriate pressure to the push piston gear T preferred in direction V, so that the Blasversatzwandteile 20 in direction V as a whole twice by the dimension T, i.e. by two steps, so that in Fig. 5 behind the protruding Blasversatzwandteile results in an offset field, the width of which B corresponds to T twice.

In Fig. 6, the next are above the introduced offset Extension frames 5 one after the other one step T advanced (dash-dotted lines). Because the retraction of the offset wall parts 20 through the blow line 17 is not possible is, the blow line 17 is disconnected at the pre-head discharge unit.

The separate line section in the extension racks that have been pulled out one step with the associated piston-cylinder units (push piston gears) T preferred. Then the offset wall parts 20 are fully retracted and it arises again an offset field whose width B is twice the dimension T, i.e. twice the increment corresponds to how it was explained in connection with FIGS.

When the offset has been introduced up to the top support frame and the face conveyor 3 is advanced one step T, the starting position is as they are shown in Figures 1 and 7 is reached again. Thereupon the entire process is repeated.

Should the extraction of the coal be slower than the blowing take place, then the pre-pledging cap 61 is shortened by pivoting or pulling in (Sliding cap), and the removal is preferred anyway.

The shown in the drawing and in the Beschreibunp; and Features described in the claims can be used individually or in any Combinations are essential for the implementation of the invention.

As can be seen, the expansion is characterized by its good and spacious accessibility, both in front of, between and behind the Stamping is possible.

The prerequisite for this creates the expansion in the upper straightening and Stabilizing cylinders and the duo system (team). With The help of the

Rear cylinder synchronously extending stabilization cylinder between That is the caps and the non-guiding mechanism arranged above and below Duo system stable both in the sinking in and in the brush. Use in pursuit up to about 20 gon overturning is also possible.

In claims 18 to 20 are further advantageous embodiments of the invention described.

Bibliography DE-AS 26 05 068 DE-AS 26 46 815 DE-AS 23 24 877 DE-AS 18 12 365 DE-OS 25 39 149 DE-OS 19 07 219 DE-Gn 75 36 391 Mehrhoff and Voss: The future significance of full backfill for the German hard coal mining industry. Glückauf April 1, 1976, pages 317 to 322

Claims (20)

Claims 1. Blasversatzverfahren for underground mining operations, primarily for hard coal mining, in which one is a migratory expansion assigned blow line intermittently in the direction of the progress of the expansion is moved, that is, that a blow-off wall (19) or. whose Blasversatzwandteile (20) motorized in other time intervals and each time it moves larger distances than the blow line (17) or larger distances as the expansion elements (5) cover them with each progression, are moved forward. 2. Blasversatzverfahren according to claim 1, characterized in that the blow offset wall (19) by a considerably larger amount than the blow line (17) or the expansion elements (5), preferably each time they move forward in the dismantling direction (V) is advanced by about twice or more the amount by which the expansion (5) Moves step by step. 3. Blow batch process according to claim 1 or 2, characterized in that that in the starting position the expansion elements (5) are aligned, offset material (59) is blown in, a mining machine (60) begins to mineral win in, after which the expansion elements (5) step by step behind the extraction machine (60), namely by an increment (T) in the dismantling direction, while the blow offset wall (20) and the blow line (17) retain their initial position, and that afterwards the blow line (17) in its entire length - unseparated - in the dismantling direction (V) is moved forward, after which a face conveyor (3) in the mining direction (V) by one Step (T) is advanced whereupon the mining machine (60) mineral again wins in while the blow-off wall still maintains its original position, and that the expansion elements (5) to which no blow line (17) is assigned to one step (T) in the direction of degradation (V) and that the blow-off wall is advanced by a total of twice the increment (T) in the dismantling direction (V), after which the next next to the offset expansion elements (5) in the dismantling direction (V) by one step (T) - just like the pipe sections coupled to one another at the end the blow line (17) - migrate, whereupon the associated parts of the blow-off wall (20) can also be moved forward by two steps (T) in the dismantling direction (V). 4. Device for performing the method according to claim 1 or one of the following, with one that can be advanced with a motor, with one that also walks with a motor Expansion elements arranged blow line, d u r c h e k e n n nz e i c h n e t that also the blow offset wall (19, 20) can be advanced by a motor with the expansion elements (5) is coupled. 5. Device according to claim 4, characterized in that in the Coupling of the blow-off wall (19, 20) with the expansion elements (5) alternately on both sides Piston-cylinder units that can be acted upon by pressure medium (push piston gear - 34 or 37) are switched on. 6. Device according to claim 4 or 5, characterized in that the thrust piston gear (34, 37) at one end on the relevant expansion element (5) and at its other end - possibly also indirectly - on the blow-off wall (19, 20) are hinged. 7. Device according to claim 5 or 6, characterized in that the blow-off wall (19) is divided into several blow-off wall parts (20) which Via the push piston gear (34 or 37) with the associated expansion elements (5) are coupled. 8. Device according to claim 5 or one of the following, characterized characterized in that with each expansion element (5) below the cap (6) in each case two push-piston gears arranged at a distance and parallel to each other (e. B. 37) and in the area of the base piece (7) a thrust piston gear (34) is hinged to the relevant Blasversatzwandteil (20) and that the thrust piston gear (34 or 37) both with the extension element (5) and with the blow-off wall part (20) are coupled so that they can be articulated. 9. Device according to claim 8, characterized in that the thrust piston gear (34 or 37) by universal joints with the blow-off wall (19, 20) and / or the relevant Expansion element (5) are coupled. 70. Device according to claim 4 or one of the following, characterized characterized in that the thrust piston gear (34, 37) with the blow offset wall (19, 20) via universal joints or cardan joints and with the extension elements via horizontal ones Swivel axes are coupled. 11. Device according to claim 4 or one of the following, characterized characterized in that the Blasversatzwandteile (20) on the expansion elements (5), in particular on the caps (6) and preferably also on the lower part extensions (tongues), longitudinally displaceable are guided and lockable. 12. Device according to claim 10 or 11, characterized in that that the universal joints or cardan joints in the area of the caps (6) on guide carriages are arranged, on each of which a thrust piston gear (37) is articulated and that the guide carriage in guide grooves below the caps (6) in the direction of striding (V) are guided. 13. Device according to claim 4 or one of the following, with from In each case two extension racks are formed by extension teams, which have link elements movable relative to one another - movable walking - are coupled to one another, wherein the individual support frames of the support team with a face conveyor alternately on both sides pressurized return cylinders are coupled, d u r c h g e k e n n n z e i c h n e t that the caps (6) of the extension racks (5) by at least one in the direction of walking (V) with its longitudinal axis Stabilizing cylinder (25) are coupled such that the cylinder tube (26) of the Stabilizing cylinder (25) via a joint (27) with one cap (6) and the Piston rod (28) via a joint (29) with the other cap (6) - also each indirect - are coupled, the stroke of the stabilizing cylinder (5) of the piston (30) of the stabilizing cylinder (25) by what is necessary to compensate for the tipping over Dimension is greater than the stroke of the associated rear cylinder (12) and that the rear and stabilizing cylinder (12 or 25) of the respective expansion team move synchronously. 14. Device according to claim 14, characterized in that the Cylinder spaces (e.g. 46 or 52) of the rear (12) and stabilizing cylinder (25) alternately communicating on both sides can be connected to one another in a pressure medium conducting manner and that each of the rear cylinder (12) moves when its piston (47) displaced pressure medium is identical to the amount of pressure medium, that of the stabilizing cylinder (25) with its synchronous running from the back cylinder (12) absorbs and provides in terms of volume. 15. Device according to claim 4 or one of the following, characterized characterized in that the cap and / or sole piece ends on the offset side are driven by a thrust piston mechanism are adjustable in length and that the Blasversatzwandteile (20) are hinged to these parts are. 16. Device according to claim 4 or one of the following, in which the blow line can be displaced via tension elements on the caps of expansion elements is suspended, characterized in that the tension elements (21) alternately on both sides piston-cylinder units (40) which can be acted upon by pressure medium are assigned and that several of these piston-cylinder units (40) lying on the blow line (17) are attached, with a plurality of piston-cylinder units (40) - preferably one via the other piston-cylinder unit or more - communicating pressure medium conducting are connected to one another, the individual piston-cylinder units (40) erdruckventile assigned. 17. Device according to claim 7 or one of the following, characterized characterized in that the Blasversatzwandteile (20) overlap each other like scales or are arranged at a distance from one another, the distance being through a gap covering apron made of flexible and / or solid material is covered. 18. Device according to claim 1 or one of the following, characterized characterized in that the blow offset wall (19) is formed under the cap (6) in the mold is that they bend the cap (6) by more than 15 go in the stroke and collapse allows and still displaceable against the offset to the lower edge of the cap (6) seals. 19. Device according to claim 1 or one of the following, characterized characterized in that the introduction of the offset with the help of a shortening Vorpfändkappe (61 slide cap) take place relatively independently of the extraction process can. 20. Device according to claim 1 or one of the following, characterized characterized in that the Blasversatzwand (19) is on the lying on one the base piece (7 lying runner) protruding towards the offset as well as one and / or retractable tongue stabilized against collapsing.