DE1583080A1 - Pit ceiling extension - Google Patents

Description

Patenfanwfilfe Or. -Feg.ff. KsßcmfcnJr, Dqrt-he. H.

2 Hamburg 30, Heuer WaK 4T

"(rubendeeken expansion ¹¹

The invention relates to a Gfrubendeckeausbau, in which a plurality of pit ceiling support units are arranged at intervals along a mineral face surface and can be gradually advanced in accordance with the progressing deboning process.

Each pit ceiling extension unit contains one or more telescopic, hydraulically extendable rams and is, for example, with. a push boble and a conveyor connected by a hydraulic winch. The process of pushing a pit ceiling extension unit consists of pushing the rams together so that they no longer press against the face surface "pulling in the winch so that the pit ceiling equipment can be shifted towards the conveyor * and finally extending the rams again so that they again counteract the mineral face surface can be chiselled *

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There are trench ceiling extensions known in which an initial extension unit see can move forward bit by bit. With this structure, however, a signal is only automatically transmitted when the expansion unit has completed the intended relocation titid from the first expansion iahe it handed over to the second following

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Expansion unit. The second expansion unit then becomes automatic causes their offset movement to be performed. When the second expansion unit has then again finished its displacement movement, it automatically sends a signal to the third expansion unit, plural marriage follows the second expansion unit and for its part finally carries out the displacement movement.

If, as a result of unforeseen circumstances, the movement of one of the pit ceiling construction units on the conveyor is not fully carried out during this pit ceiling extension (for example, if there are bends on the ground between the unit and the conveyor or the unit from the strut ceiling, which is pushed together by the punch has broken in, is locked), then the successive advancement of the expansion units stops and a worker must be. be consulted, which exposes the stuck pit support unit again. The advancing movement of the units can only start again when the worker has released the stuck unit and it has finished its movement. . , *, .-

Such yorschiib delays reduce the., Possible. Reduction; - ₅ .. amount within a given 2 time?. ,, ^,.,., .. .. _: . · ,. ".," / ,,, _7S ,,. ^

Bs is an object of the invention _9, n \ -SrubendeQkenausbau ent to be created consisting of a number of Ausbaiieiiilieiteii "which are arranged at intervals along a longwall face and in which, such Eransgörtstörungen. do not occur.

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The task at hand is for a pit ceiling extension the-mentioned-type solved in that according to the invention 'the Feed movement of an expansion unit after `` completed feed movement '', the previous expansion unit through the transfer a single liquid pressure signal from a control point is initiated from, which belongs to all expansion units ".

In an expedient further development of the invention, the pit ceiling support contains liquid pressure lines which emanate from a pressure source at a control point, which can be arranged apart from the extension units, and lead to the individual extension units, with lines in between in the pressure lines the expansion units (other than the first unit put into operation in the sequence) and the control point, valves closed in the idle state, are arranged and the advancing movement of an expansion unit is caused by the "transfer of a liquid pressure which is supplied by the; control point to the unit" is passed, which moves to v / ground and, while the movement or viährend the completion-of locomotion this Ausbaueinheix, the normally closed valve intermediate the 'control point and the next expansion unit in * offset such a state is _f that the feed of the next Expansion unit can go ahead, w If the fluid return signal from the control point to the next following unit is wound out; ^! '"''""'"'"

h a - "further development of the 'irfindün ^ f eätlmlf ^ der Grubeneustiiu a? Iüssi £; lceit

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BATH

Return lines which are arranged along the mineral face surface, each excavation unit being provided with a valve through which the unit can be connected to the liquid supply line and the return line; Furthermore, a first conductive fluid line is provided which, when pressurized, actuates the valve of the first unit so that it can be lowered from the face surface and displaced along the mineral face surface. When a second guide line is pressurized, it actuates a valve of the first unit, which causes it to be supported again against the face surface by being extended; the control valves are arranged at a control point and are able, in one position: to pressurize the first liquid line, but not the second liquid line, while in another position they pressurize the second liquid line; The valves are arranged in each unit in such a way that when the first guide part is pressurized, the first expansion unit is lowered and displaced, this unit being the unit which follows a unit which is brought back to support against the ceiling by a second liquid guide line has been"

The invention is illustrated with reference to the drawing The following examples show: '

Figure 1 shows a number of sliding pit ceiling support units, which are arranged along a sole surface,

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FIGS. 2a and 2b show parts of one of the expansion units and the associated one Control members,

Figures 3a and 3b parts of another expansion unit and its assigned control valves,

FIG. 4 shows a control device in a control point aside the expansion units and

Figure 5 is an instructive drawing showing how the devices of Figures 2a, 2b, 3a, 3b and 4 work together.

lüine coal mining machine 1 shown in Figure 1 operates from the left to the right along a naeli carbon surface 2, where they degrade KoLiIe from the surface via the second The mined coal is carried away to the left by means of a conveyor 3. The StrebdGCMce is supported by a number of expansion units 4, which are arranged at equal intervals along the expansion route,

Each ^ usoaueinlieit is via a control valve with a main » pressure supply line 5 and a main return line 6 tied together. Both main lines lead from one aspiring person to the other and both are using a igke it's pressure source 7, which is arranged in the so-called YJache outside the left end of the conveyor. Both main lines are not shown in Figure 1, but shown in Figure 2b.

Each expansion unit has three telescopically extendable, hydraulic

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lisch to be operated stamp 8, which, if aie over the. ... the control valve are connected to the main pressure supply line and are extended so high that they can press against the face in the area of the unit. However, if the three stamps are connected to the main return line via the corresponding con

t are they so shortened,

troll valve are connected so / that they no longer cover the ceiling prop up.

Each expansion unit is also equipped with a hydraulic winch which connects the unit with the conveyor. Each winch can be connected to the main pressure line via a valve which makes it possible to send the stamps to the Use conveyors if they do not support the face.

The winches can also be connected to the main pressure line via valves be connected when the punches are against the longwall face to press. In this case the winds move, the sponsor. .

It has been shown that it is not necessary that every winch can move the conveyor. The winch shown in Figure 2 is only able to attach the expansion unit. to consult the sponsor. The winch shown in Figure 3a can both pull the unit to the conveyor, as well push the conveyor away from you. :

Each valve contains a main valve block 10 and a longwall, lowering valve block 11. The valve block 10 consists of four valves, of which the valves 12 and 13 are used to control the conveyor

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to push away from the expansion unit. The third valve 14 cooperates with the valve 1j5 to pull the expansion unit towards the conveyor; Finally, the fourth valve 15 is used to extend the stamp up to a length where they support the face surface.

The valves 12 and 15 are connected to the main pressure supply line 5 via a branch line 16. The valve 14 is in a manner to be described later via a pull-up pressure ^ir "(pull pressure) -Versorgungsleitung 1? Also with the Hauptdruekversorgungsieitung 5 in connection. Each of these valves and the valve 15 are connected via a ITebenrückflußleitung 18 with the Hauptrüclcflußleitung 6. Connected.

Each of the valves 12, 14 and 1: can be activated by a pressure signal which is sent to its pistons 1 ¹ , 2C and 21, as will be described later . Each hydraulic circuit belonging to one punch 6 contains a release valve 22 and a relief valve 2'5. The release valves can be actuated by the application of hydraulic pressure to the piston 24, which contacts its movable valve body. * _:

In a control point provided limes from the coal surface to be mined, control equipment is housed, voii the pressure signals between . different valves of the individual aciiient can be sent. This remote control.

Degradation units, -.-.- _:.

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The control redness shown in Figure 4 'contains a Control valve 25, which is connected to the main pressure supply line via an open-close valve 26, 5 connects. In one position of the AbbaueinheitkontroUventiles 25, the retraction the ram and serves to pull the unit to the conveyor, the main pressure supply is connected to a first Command signal line 27. This line 27 is again passed through to a control valve 28.

This direction control valve has two working positions. In in one position it connects the mining unit control valve 25 to the mining unit at the left end of the one to be dismantled Coal surface. When the valve is in this position, then the dismantling units move one after the other, starting from left to right. In the other working position of the direction control valve 28 is the dismantling unit control valve with the dismantling unit at the right end of the Coal surface to be mined -connected and the mining units move in this case one after the other from the right to the left Left.

The connection to the first dismantling unit from the directional control valve 28 and the connection to the last dismantling unit from the direction control valve 28 are the same, so that only one of the lines is described below.

The direction control valve 28 is via a line 29 with a ^ orjtnung ^ out. _? four '^ test valves 30, '31, 32 and 33

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(Figure 2b) connected. The ■ connection is made in such a way that that the degradation unit either in accordance with a pressure signal can work that comes from his mind or his right *

The test valve 30, which is when the line is pressurized 29 opens, is connected to a first sequence valve 34; In addition, it is with the valve in the one shown in the drawing Position connected via the body of the valve 34 and a line 35. The line 35 is in turn via a line 36 with the piston 24 of the ram release valve 22 and above a line 37 with the piston 20 of the valve 14 in connection. Furthermore, a connection of the line 35 leads via the throttle ■ place 85 on branch return line 18.

■ If valves 26, 25 * 28 and 34 are in the positions mentioned above take, then the main supply flow has an inflow Stempellöseventileni the stamp can then collapse. . Liquid coming from the stamps then flows through line 38 also. Main control valve block 10 and to the reflux line 18. In addition, there will be the main congestion pressure open valve 14 * whereby the main supply

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gungsdruök the possibility gives _s through the pull-Drüok (pull-pressure) - "supply line 17 and a line on the other side of the winds durchq.üerenj au 9 which winds imm 2usammen3iehen causes WI3 dj the reduction unit is thus at the Front hot items *

When the ram is ready for completion of a forward movement of the

10 ■ *

Expansion unit can be printed again against the track surface should, then the control valve 25 is in its other position brought »In this position the main supply pressure is connected to a second miter signal line 4G. To the at the same time a line 29 is kept under pressure, which is slightly lower than the pressure originally applied (e.g. 73.1 kg per cm versus 146.2 kg per cm); this reduction is brought about by means of a reducing valve 41, that - in one? Connecting line between the control valve 25 and the first control signal line 27 is arranged. The "line 29 with reduced pressure holds the Valves 14 and 22 open as well as a pressurized one Valve 42.. ·

The control signal line 40 is connected to the valve 42. As soon as this valve is opened, the pressure from the control signal line reaches the piston 21 of the valve 15 via a line 43 Valve and via line 38 and valves 22 (which, as will be determined later, are kept open) on the rams to extend them and press them against the face. The flow of liquid to the stamps is partially supplemented by liquid in the signal line 40. The flow of liquid then passes through throttles 44 into a line 45 and via a check valve 46 ί «© ine line 38 *

If the stamps are legal again; sindj, then the pressure rises in

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the line 38 and closes the test valve 46. As a result of the liquid level in the signal line, the pressure in the line 45, which leads to a piston 47 of a valve 34, rises. This piston, when it is pressurized, causes a movement of the relative valve element of the valve 34 in order to prevent a connection between the lines 29 and yj su, while the line 2'j is opened to the line 48. The reduced pressure in line 29 then holds valve 34 in its new position.

The, line 4β is with a second 3? O Ige valve 4 ¹ J and, as can be seen from Figure 2b, via the. Valve body further connected to a line 50. The line 50 communicates with the surface of a piston 51 which is arranged separately from the movable valve element of the valve 49 (. Because of the reduced pressure in the line 29 and therefore also in the line ^ O, the piston moves in the direction of the The force ifsr is not sufficient to move the piston against the pressure of a pretensioned spring of the movable valve element into the position shown in the drawing.

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set position to press

While the control valve Z ^z j of the expansion unit has been brought into one position and then into its other position. is, ^ lxatv äie the expansion unit, which is shown in Figures 2a-and 2b, a complete Vprschubbev / egung carried out from the. Lowering of the ram, drawing of the unit en deri _; , j? örfer and. and finally, before the Ausialiren, the stamp

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opposite the longwall is there »

In order to be able to carry out an advance movement of the expansion unit following the next in the row, one of which is shown in FIGS. 3a and 3b, the control valve 25 is returned to its first position. The main pressure is then applied to the first guide line 27 and on to the lines 48 and 50. The compressive force then works on the piston 51 and . is sufficient to move the movable valve element upwards to thereby separate the lines 48 and 52 from each other. The movable Yentileleiaent is then held in its new position by means of the pressure in the line 4Ü.

Line 52 has four test valves 30, 31, 32 and 33 like this connected that the valve 33, which the line 52 with the Abbaueinheityerblndungsleitung 53 connects, are opened can. The line 53 then leads again to four test valves 30 ', 31 ', 32' and 3-3 'of the next expansion unit and further to a sequence valve 34 *.

The line 55 leading to the expansion unit shown in Fig. 3 corresponds to the line 29 leading to the first expansion unit; - as a result, the printer in the main line 53 will cause the stamp 'ei' to be transferred from the roof, Where-. Then we aie "de_ ^ ¹ the expansion unit to the sponsor. approach, see ..

. <epi..dl.es.eii, s.ir * £ "5, tr.eten igt, .. then the rlontr oliv ent il, 25

the B-inlieit gebrachtί to its second position by the Brüeic in the first Signalfüiirtingsleiteng, lowered, and the 1st BrKeIc the aweiten. Signal guide line raised. As a result, the stamps will be long again. supporting the Strebdeclce, read second sequence valve 49 ^f is then located in precisely the same as · "zsavor the ■ IPolgeventil 49 · offset _r ■ WO dtürefe üle first Signalfünnungsleiteng to animal testing valves of näe & stfolgenden Ä ^ sbaraeinEieit dtireiinrerbBnden is wesiialb operates these -Weraeni when the control valve is returned to its first position.

The Törseliiibbewegiing the individual Abbaxieinlieiten is thus caused by a single FMssigfeeitsdrneksignal that danny if it is gewönseMt of ε · _s gfugefiilirt. Bie

takes place wan. one and all. .Aasbaueinfeei- ten common checkpoint. Bie two liquid defined feeitsdriic & signals that emanate from a Eontrollventil _r are SITR Kircliftiiriing of Tersetzprozesses linerläBlicli; while the first signal is one, first. Eeil the Tersefebewegong, the second signal for AEIE is followed. ¥ he—

In deEt swept StreelcenansbaiL · there is a constant insane knowledge. the "üeitrosigeii 29 _f 53 _y 53 ^f msw" and the "Yentti— ■ ien swisehem xtaes. This terlst can be so large that after the movement of five or more dismantling parts, further perfect work becomes difficult. For this lall feaKQ For example, at every sixth dismantling unit, a modified second sequence valve can be provided, which is used as a

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so-called regeneration sequence valve can be considered. , The in & en figures. 3a and 3b shown dismantling unit is equipped with such a modified sequence valve. Since this dismantling unit otherwise completely corresponds to the dismantling unit according to Figures 2a and 2b. " only this valve is described in detail

Coming from DEM first sequence valve 34 ^F Iieittsng 48 * ^r itniaittelfear via a throttle 54 with the piston 51 Terbiinden: In figure 3b is a. (At. The valve 43 ^1, the connection to aMrch. VentilkSrper zol the piston 51) * Bie throttle. 54 prevents the docuck increase in the line; 48, which would cause the valve element of valve 49 * to jerk off from the position shown in the drawing »

the pressure in the first Signalfühningsleitiing 27 from its reduced ¥ _e rt to the value in the main pressure line * as a result of a suitable movement of the Eontrollventiles the Äbbaueinheit increases, 'the piston 5i verscEiebt * of the movable valve element of the valve 49 * which t the läeitungen 80 and 52 ^f . to be connected to each other. Bie Lei-. The device 80 is again connected to a line 81 which is directly discharged on the coal surface and which is connected to the first signal transmission line 2? connected is. The lter _f pressure of the first signal routing line then arrives via the four EcM valves "to" ^ the next dismantling unit and corresponds exactly to the bridge "which- the first '" affected dismantling unit was listed """" ■■ "'. ^: - '■ ·

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Ks "is öereitB., ^ ^1, etc., ά. Hi ■ 'has been mentioned, the hydraulic jacks ■ ;, that-' every fourth, perform two functions. One function is to" that used to be moved reduction unit to the conveyor The other function is to push the conveyor away from the dismantling unit as long as its rams are pressed against the track surface.

Thus, a h;.> Drauiische winch For Example, "every sixth, the second function can alien from a Schiangeiiventil is provided (snake-valve), which is shown in Figures 2a and 2b in conjunction with the reduction unit The snake valve contains a Serpentine valve body 55 with two similar pressure-responsive valves 56 and 57. The pressure-responsive valve 57 is used when the displacement sequence is right along the coal-mining route from Liiiics, and the pressure-responsive valve 56 is used when the vöi 'set'z'foige · in., which runs in the opposite direction.

The ήύή hesulmieütnei. Working method of the ochlangenvalves refers to axiie "." - Ver? Etz.sequence.-from the left- rrwh reoiit-s. If the .I) Γüβk ^ äus / der; I5a ^ pt ■ dr; u ■ Q} ίΓy: eκsQrέ _^ · 4ngs ■ lei ■ do £. at the first signal fiüi ^ un ^ rsiteituät: '27, (the control valve of the dismantling unit / beiIn det'.sisii diiljei, .irirs # iner ■ first.-öteij.uii.j :) ani-iegt, · then he is alsor- i® de3>': U.j3irtung-55 availablei Viie -be already bescliri-even was. The. "Iiei-tani.- * ?. Is a leituiig <'5-y, nitrdesi _ö KoIberL. 5 ^ .des. Ve: ii? Il; es ^: « Γ waii.! Er. Koioeix 6G aes-Valves §Ιί ^ e ^ ßunden * -Line, V'QXij der ^ ie-ivui ^. £> ^: - branched .. Lei-tuiit: 61 2 9 with de:.: -Vazitli 57. 'rvegen des an der Zc

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Valves 57 and 56 when the pressure is applied, these valves are open. The branch line 61 then leads to the valve 63 and keep this closed. Gie is also about the test valve 64 connected to line 65, which is not connected to the next serpentine valve in the series, but to the next following and a serpentine valve communicates.

The pressure in the line 65 opens the valve (66 ⁿ ), which corresponds to the valve 66 according to FIGS. 2a and 2b, in the opening of the next-and-one serpentine ^{valve (55 n} ), so that the valve 6b ⁿ and, the line 65 is connected to a line (67) which corresponds to line 67 of FIGS. 2a and 2b. The line 67 is connected to a valve (for example 12 ^L ' ) which corresponds to the valve 12' and belongs to the dismantling unit located next downstream, which contains the serpentine valve 55 ⁿ . The pressure in the line 67 ⁿ will then open the valve ΐ2 ^{η +} and connect it to the branch line 16 ⁿ which leads to the hydraulic Y / inde 9 ^{n +} . The conveyor at this v / inde ^ e ^ en [Dell of the. fixed degradation unit v / eg pressed. If desired, several ver.-iie corresponding to the valve 12 'can be connected to the line 67 ^η so that the conveyor can be pushed away by several winches. The actuation element of the control valve 25 of the dismantling units, which is housed in a control point, must be informed of the progressive relocation of the individual units. Monitoring devices are provided for this purpose. Such a Lber \ -, 'ac} ^ urij_3vorrichtung consists of a hydraulic

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actuated counter 68 (Figure 4) ,, which has the task of determining the number of dismantling units that have already completed their relocation movements. The hydraulic meter 68 includes a line 69 which leads from the reducing pressure side of a reducing valve to a piston-operated valve 70 on the dismantling unit and can also be displaced with it. This Y-valve is closed in the rest position with the aid of the pressure in a line 71 which is in communication with the line 36. During an offset movement of a mining unit, the line : 5b'and the connecting line 71 is pressurized, v / whether the TJrαoi-r has a higher value than the pressure in the first / osignalfülirun ^ line. The dismantling unit and the yentil [(O i-jaw "Ot_; en on the! • 'ürdersr au. .Veim the xibbaueinheit Uoi'i front ex thereby aux" has approached a certain distance, dt.nn v.'ird the movable valve member of the valve 70 is lifted off its clit-.j, because the punch 72 with "a bevel 73 abuts against the ino ötf! cioiiure, / inden rod. This increases the pressure in the line 69 of the pressure by means of the reducing valve o2 reuti ^ IOx fcen ', / ert au £ ert a higher i /. This Drucld'iiderung ■ fIilirt to a Sählvorgang in the counter. the Sählvorgang can uooei ■ auoh- be optically tingeseigt through the needle position of a. the pressure gauge 74 ·

further monitoring device consists of a counter which is connected to a display device 76. The display device 76 contains a piston-cylinder device 77. One cylinder end of the device 77 is connected to a line 78 connected, which leads to the main pressure supply line. That the other end of the cylinder is connected to the pull-pressure supply

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device 17 connected. This line 17 is in turn connected to the main pressure supply line via a pressurized valve 79. In the. In the rest position, the valve is open and the two ends of the piston-cylinder device 77 are in connection with one another. The pressure applied to the piston of the device 77 then moves the pointer 83 to the right-hand end of the scale of the indicator 76.

when the iControllventii 25 is brought into its first position, in which the ram is drawn in and the dismantling units are moved towards the front, including the pressure in the first signal guide line 27, v / as closing the valve 79 leads. In this position the valve 14 is open and thus allows your liquid flow to flow out of the line 17 to the winch y. i) The liquid thus flows away from the left cylinder side of the device 77. Thus, the pressure acting on the piston dex "Eauj.tdruclcversorgungsleitung can move the piston 7Jer payers '73 ziVhlt it each time so that the number of support units is held by the pointer iirika be ^ 'Cot:.... Their Offset movement have started. '

When the control valve 25 is in its second position, then the punches are pressed against the face and the first routing line 27 becomes pressurized

for example 73.1 kg per cm. set what is less than

2 * the pressure of 146.2 kg per cm, which was on the Jieitung when the valve 25 was in its first position. The pressure reduction in the line 27 "causes the opening of the

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Valves 14, the valves 22 and the sequence valves of those dismantling units who have already completed their work processes and through which the first signal has to step in order to to operate the i'olgenderi units. Keeping the valves open however, it could be done in a different way.

The valve 28 can be a 3-way, Zvreiposotionsventil, "" ./enn it is in its first position, which is shown in FIG then the displacement movement takes place from left to right. In this first position is a line 83, the with ^ the line is connected to that of the line 5> corresponds to and from the subsequent parts of the let ^ toa: degradation unit is that works when the relocations of linlcs after proceed to the right, also connected to line 84 which, as a result, is connected to the main return flow line 6.

3ur completing the Foljje wira the valve 26 in his "On" position, which reduces the pressure on the lines £ 7, 2y and 81 2urüc! Rftlhxt, dtiBiit alle Fol ^ eventile in ilire Au3-gangspositioöen ' surcick sweeping jrönnen. ^

Is · .. anseht 'a dislocation of reelits left V-örswn eiiisÄ ^, ^^ Kird as -YeiiiiZ aurüeicgedi'ehf 2v in his Ause nöSsteilung and d - if-it dam.cr *: as "Ve-?. iatil Zz - in pure second positior ^ e brach-t ,. J) is leittinj ö '~ - lot äaroi rsit connected to the line 27, so du del Terret.mngsprose; * = dam: right oeginnen and ^ inkc of 3osubaueiiae- n Ecbieoterflache can run to linlcs.

The Venti- e 1 £, 1 ;, 14 ,. 15 and 2L --- 3ii: d r; usi't2lieh nit Eana-

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handles provided. These handles allow the offset the dismantling units can also be carried out manually instead of using a remote control, if this occurs during the relocation of the individual Dismantling units should be necessary.

When the control valve 25 is placed in its second position is and the second signal line is pressurized, then according to the invention, the first signal line to be put under pressure. This pressure corresponds at a pressure that is on the line when the control valve 25 is in its first position. With this switching option, the second sequence valve becomes a dismantling unit held in the position shown in the drawings; this position is achieved by an additional piston, which can be exposed to the second lead pressure and the Piston 51 can counteract until the second signal line pressure is canceled.

The structure shown and described in the drawings is based on a uniform pressure supply for the first signal routing line, the punches, the winches and the remaining parts of the expansion units. However, this is not necessary; the first signal line can also be supplied with the pressure from another supply line.

If one of the dismantling units according to the invention is not offset by the full expected amount, for example there Debris lying on the bottom of the mining stretch can then get through

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Appropriate movement of the control valve puts the plunger in the position reached are pressed again against the face. If the control valve 25 is then in its starting position brought back after the punch of the unit in question has been propped up again on the face, then the the next dismantling unit. The sequence of relocations of the dismantling units can thus be continued even if one of the dismantling units is the dislocation movement does not perform; the sequence of dislocations experiences little or no interruptions. That dismantling unit which has not advanced by the desired amount can then either be done in the next sequence of shifts or by hand be tightened. The vision of time through further guidance the iol.ge when the failed dismantling unit is cut out is only then questioned when several breakdown units one Series fail to comply with the proposed transfer process.

Claims: 009817/0910 - 22-

Claims (12)

Claims: · '9 · OKI. 1967 1. Pit ceiling extension, which consists of individual extension units,. which according to the progressing degradation process can be advanced one after the other in the degradation direction, characterized in that the advance of the individual degradation units (4) ^ can be initiated by means of a -üPlüssigkeitsdrueksignales which emanates from a control element (25) common to all degradation units. 2. Expansion according to claim 1, characterized in that between the individual expansion units (except for the first one to be operated Unit of the IoIge) and the control link (25) in the rest position closed valves (34, 49) are arranged so that during or after completion of the gate push of a unit (4) the Valves (54 *, 49 ') of the next following unit to be relocated must be put in such a position that the relocation of the next expansion unit is initiated, when the next fluid pressure signal from the controller is sent out. · 3. Expansion according to claim 2, characterized in that one first liquid pressure signal line (2?) from your Control element (25) proceeds from the liquid pressure signal can be pressurized to cause an expansion unit * lower their struts and advance, and that of the control member (25) another second liquid guide line '' (4O), which is based on a second! Liquid pressure ^ signal can be put under pressure to complete the offset 00981 7/0910 _BA 0 movement of the expansion unit, this again against the ceiling the longwall is pressed. 4. Expansion according to claims 1 and 2, characterized in that that the first liquid guide line (27) is not pressurized when the second liquid guide line is under Dyuok. 5. Expansion according to claims 1 to 3 _t, characterized in that the second liquid guide line (40) as well as the first liquid guide line (27) can be pressurized, the pressure in the first liquid guide line being lower than the pressure which the pressure of the ■ liquid pressure signal. 6. Expansion according to one of claims 5 to 5, characterized in that a normally closed valve is provided on one of the expansion units, which is located between the control member (25) and the next expansion unit to be operated in the sequence. < 7. expansion na.cn one of the preceding claims, characterized in that that the normally closed valves (34 ', 4S' '), which are assigned to some.-i-bbaueinlieiten, directly with the first liquid guide line and the remaining ones normally closed valves with the first liquid filling line connected via at least one normally closed valve, the latter of which are preceding Disassembly units are assigned, veiin such valves are open. 009817/0910 BATH ORIGINAL 8. Expansion according to one of claims 1 to 7, characterized in that each expansion unit (4) with a conveyor (3) · is connected, which extends in front of the row of support units along, and that the connection via hydraulic winches is made, with which the expansion units relative to the 'conveyor and the conveyor relative to the removal units can be displaced are. '. 9. Expansion according to one of claims 1 to 8, characterized in that, that a hydraulic signal for the control element (25) is emitted from an expansion unit, which is a display device (76) is actuated when a dismantling unit has approached the conveyor (3) by a certain distance pn. . 10. Expansion according to one of claims 1 to 9, characterized by a counter (68) in the area of the control member (25), which is actuated each time "when the first guide line and / or the second guide line are pressurized.>. 11. Expansion according to one of claims 1 to 10, characterized that some of the expansion units are provided with a hydraulic winch with which the conveyor from the expansion unit can be pushed away. 12. Expansion according to claim 11, characterized in that the expansion units are equipped with conveyor advance valves (56, 57) are, which, when one of the expansion units completes its advance movement, the conveyor ^ advance valves of a, 0 0 9817/0910 - 25 - or several other conveyor hoists in operation place ^ those with further expansion units along their front side are connected. UO98 1 7/09 10 Blank page