DE1902043A1 - Pit lining element - Google Patents

Description

PATENTANWALT BODE 4033 HÖSEL POST BOX TELEPHONE 02102-61701 TELEX 8585166

R 1 - 225 II / Bo

GULLICK LIMITED

Kirkless Street, Wigan, Lanes., England _

Pit lining element

The invention relates to a pit lining element which is equipped with a pre-pledging cap that can be hydraulically extended parallel to the hanging wall is provided.

With longwall mining in underground mining operations, certain unfavorable slopes of the slope sometimes cause the Sloping end strips remaining without support between the front edge of the extension row and the excavation joint falls after the mining machine has passed and before the expansion series advances. To intercept this hanging strip it is known to provide the caps of the extension elements of the longwall construction with so-called Vorpfändkappeη, which are supported on the caps of the extension elements and the hanging strips in front of the extension line immediately undertaken after passage of the extraction machine. Such pre-pledged caps are usually longitudinally displaceable in or on the Caps of the expansion are guided and pulled out by hand and braced against the caps with the help of bracing devices. Lately, pre-pledging caps have also become known which can be extended with the aid of hydraulic cylinders.

In the known pre-pledging cap arrangements, the pre-pledging caps are released and then retracted or extended

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PATENT ADVERTISER BODE · 4033 HÖSEL. POST BOX ■ TELEPHONE 02102-61701 · TELEX 8585166

only possible if the associated expansion element is out of its bracing between hanging and lying is solved because the forces acting on the pre-pledged cap after a short time are so large that the .Vorpfändkappe is used to clamp the .Vorpfändkappe Bracing device can no longer be released. The operator must in addition, work to extend or retract the pre-pledging cap over the moving face conveyor. this is not allowed for security reasons.

fe It is an object of the invention to use the known expansion elements To develop the pre-pledging cap in such a way that these disadvantages do not occur.

The subject of the invention is an extension element which is equipped with a pre-pledging cap that can be hydraulically extended parallel to the hanging wall is provided and is characterized in that the pre-pledging cap is in the bracing between hanging and lying located expansion element in each lying between the largest and the smallest extension length against the hanging wall can be pressed on, released from the hanging wall and again extended or retracted.

According to a preferred embodiment of the subject matter of the invention, the extension element is attached to the cap structure one for extending or retracting the pre-pledging cap and one for tensioning or releasing the pre-pledging cap serving device attached.

With the aid of the pre-pledging cap arrangement according to the invention, it is possible to extend the pre-pledging cap in any desired way and braced against the hanging wall. Furthermore can

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the pre-pledging cap is released from its tension at any time, be pushed further against the dismantling front and tightened again, or also be retracted again, without the associated expansion element being released from its tension between hanging and lying needs. This enables the pre-attachment to be adapted particularly well to the given operating conditions enables. For example, in planing struts, the pre-pledging caps can gradually be advanced gradually against the working face as it corresponds to the method of operation in this extraction process, so that here too the one to be intercepted Hang strips can always remain supported. I.

The pre-pledging cap is preferably mounted so that it can be moved longitudinally in the cap structure of the extension element and is also laterally displaceable provided protruding pins that engage in serving as guides longitudinal slots in the cap structure. This makes it possible to move the Vorpfändkappe on the one hand in its longitudinal direction and on the other hand to the To pivot pin to brace it against the hanging wall.

The hydraulic pressure cylinder which is used to advance the pre-pledging cap is provided with laterally protruding pins, which are attached to consoles that are connected to the cap structure of the extension element. There are the consoles expediently provided with slits inclined to the vertical, in which the pins of the pressure cylinder can be displaced are. This type of fastening of the pressure cylinder ensures that the same can be displaced against the cap structure and is pivotable so that it can adapt to any angular position and height of the pre-pledging cap.

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Between the rear end of the pre-pledging cap and the cap construction, the wedge is one for bracing the The pre-pledging cap can be pushed in against the tensioning device serving as a hanging wall. As a result, the pre-pledging cap is around their Fastening pin pivoted and pressed against the hanging wall with its end on the mining joint side.

Furthermore, between the pre-pledging cap and the bracing device an elastic yielding device is provided, which is expediently between the wedge of the clamping device and the pre-pledging cap is arranged. This yielding device ™ consists of a bent leaf spring attached to the pre-pledging cap is attached and resiliently rests on the wedge of the bracing device, so that the forces used for bracing be transferred via the leaf spring to the rear end of the pre-pledged cap and this relative to the cap construction of the expansion element is pressed down. This ensures that the pre-pledging cap only absorb a limited load can, so that the clamping device remains releasable at any time.

The bracing device is expediently with the aid of the hydraulic The pressure cylinder is actuated, with which the pre-pawn cap is also pushed forward against the dismantling front. To this Purpose of the hydraulic pressure cylinder has two oppositely extendable and retractable from a common cylinder part Piston, one piston being connected to the pre-pledging cap and the other piston being connected to the bracing device. Due to this special design of the pressure cylinder, a separate pressure cylinder is used for tensioning the pre-pledging cap saved.

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The wedge of the bracing device expediently cooperates with an inclined surface on the end section of the pre-pledging cap. To limit the load absorption, the wedge angle and the angle that the inclined surface with the horizontal eir.fehlii dimensioned so that with a certain force acting on the end of the pre-pledged cap, the pre-pledged cap yields. This takes place in that the wedge of the tensioning device is displaced in the event of an excessively high load s, yf of the "© bs" -cited inclined surface, thereby indexing the piston connected to it in the hydraulic pressure cylinder. ^ and in this cylinder generates such a pressure that an overpressure assigned to the pressure chamber of the cylinder speaks. This device also avoids over-?.?!,. .;. Hanging walls can come free without the associated extension element having to be released from its bracing between hanging walls, ur.c * . *. <&% . ^.

For example, two embodiments of the subject matter Invention will, in the following with reference to the drawing nahü described in the

Fig. 1 is a side view and a partial Sol'n'tt an elemenx of excavation with an extensible and elrfah-able Pre-pledging cap in the retracted Pötitiw; ..

Fig. 2 is a plan view of Figs. 1,

Fig. 3 the cap construction in a similar Dc-rstal " zi ^ as Fig,. ·. Sjsdocn with ausfalaen-af» '. ^Γ & 5 · νΓ = .-' ₁ .ίΐ: Λί.; · ^

Fig. H schematic cross-section through, ά ^ η in i'cn?; Lg 2 and 3 shown, for extension and retraction .-- j ^ t ^ v ₄ for bracing the Vc-ppfär.dkappe dier; a ~ Sc- , h ~; ± «..-. iischen pressure cylinder,

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5 shows the type of loading of the pre-pledging cap,

6 is a rear view and a partial section by means of an elastic yielding device arranged in the expansion element,

FIG. 7 is a side view of the yielding device shown in FIG. 6 and

Fig. 8 is a partial side view of a second embodiment s » form of the subject matter of the invention.

The expansion element shown in the drawing has a © Aappen construction 10 on »the. of hydraulic rams ii ! ©, which © are attached to a base plate 11a tilt of the base plate is still a hydraulic "back

connected, which is used in a known manner to advance the face conveyor ³ ^? ® against the newly exposed mining front as well as the subsequent tightening of the construction element, with the face conveyor »serving as an abutment.

lit the cap construction is an extendable and retractable pre-pledged cap 1? connected _s which is provided on both sides with round tenons * i4. These pegs If are displaceable in slides 13: which are provided on the inside of the legs 10a and 10b of the cap construction 10, between which the pre-pledged cap 12 is guided during the extension and retraction process

is \ n the bottom of the "cap structure 10 is .onsolen between two fixed 18 min hydraulic pressure cylinder 15, eat cylinder part on both sides with pins 17 which de in zw ^ i arranged in the brackets 16 slots 18 are free to slide." The slots 18 in the consoles 16

:. run inclined to the vertical.

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The hydraulic pressure cylinder 15 is provided with two opposing extendable pistons 15a and 15b, as shown in Fig. H is shown. The piston 15a is connected to a piston rod 19 which is used to extend and retract the pre-pledging cap 12 is used relative to the cap construction 10. The other piston 15b is connected to a piston rod 20 which is used for Pressing and bracing of the pre-pledging cap 12 serving bracing device 21 actuated. The tensioning device 21 is provided with a wedge between the cap structure 10 and an inclined, upward-facing surface ^ on the rear End portion of the pre-pledging cap 12 can be inserted.

In Fig. 4, the hydraulic pressure cylinder 15 is more ins Individual shown walking. The pressure cylinder is provided with a pressure medium connection 23, which is used to retract the piston rod 19 is acted upon, and has a further pressure medium connection 24aif, which is used to retract the piston rod 20 is acted upon with pressure medium. Another pressure rail connection 25 is provided at the free end of the piston rod 20 and protrudes over the hollow piston rod 20 with the pressure space between the pistons 15a and 15b in connection. This pressure chamber is acted upon with pressure medium in order to drive the two pistons ISa and 15b apart.

An illustration of the distribution of forces on the pre-pledging cap 12 is given in FIG. 5. Overall, the pre-pledging cap 12 is designed as a two-armed lever which is supported by the supporting force F at the pivot point, ie at the pin IU. The force acting from the hanging wall on the section of the lever on the working face side is denoted by T, while <Sb force exerted on the lever by the tensioning device 21 at the rear end is denoted by R and the wedge angle is denoted by <K.

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The yielding device shown in FIGS. 6 and 7 is used to limit the load to be absorbed by the pre-pledging cap to a certain value. It is arranged at the rear end of the pre-pledging cap 12 and consists of a curved leaf spring 26, which is firmly connected with its central part to the pre-pledging cap 12 or loosely anchored to this with the help of a pin 27 and with its free ends on the wedge surface of the clamping device 21 rests, which is designed to receive the end portion of the pre-pledging cap 12 slotted.

In the functional description of the device according to the invention, it is assumed that when the extension element is in place, the cap structure 10 is pressed against the hanging wall as a result of the pressurization of the punch 11. The pre-pledging cap 12 is still retracted, as shown in FIG. 1. To extend the pre-pledged cap 12 against the mining front, the pressure medium connection 23 to the drainage of pressure medium is now opened and the pressure medium connection V \ is closed while the pressure medium connection 25 is acted upon with pressure medium. As a result, the pre-pledging cap 12 is advanced relative to the cylinder, which automatically moves into the. Adjusts the direction of movement of the piston 15a. When the cap Vorpfänd * extended to the desired length, the pressure medium connection 23 is closed and the pressure medium connection 25 is opened to the outlet of the pressure fluid, while the fluid port 2H is acted upon with pressure medium. As a result, the piston rod 20 is moved in the extension direction of the pre-pledged cap, whereby the wedge of the bracing device is inserted between the surface 22 at the end of the pre-pledged cap 12 and the underside of the cap structure 10. If, as described above, at the end of the pre-pledging cap 12

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a Nachgebevorrichtung is provided, the wedge is driven between the Verspannvorriohtung 21 the outer portions of the leaf spring 26 and the cap structure 10th As a result of the movement of the bracing device 21, the pre-pledging cap 12 is pivoted about the pin 17, so that the section of the pre-pledging cap 12 on the working face side rests against the hanging wall. In this position, the extended pre-pledging cap 12 is braced against the hanging wall to support it.

If the Vorpfändkappe to be solved 12 that it was in order to advance further against the working face, or was .es, i get them back to retire, the printing center are! Connections 23 and 2U opened so that the pressure medium can escape, while the Pressure space between the two pistons 15a and 15b is acted upon by pressure medium via the pressure medium connection 2 5. The pre-pledging cap 12 can then be advanced further in that the pressure medium connection 23 is opened and the pressure medium connection 2 ^ closed while the pressure medium connection 25 continues to be pressurized with pressure medium. However, if the pre-pledging cap 12 is to be retracted after it has been released from the bracing ₃ , pressure medium is applied to the pressure medium connection 23, while the other two pressure medium connections 24 and 2 5 are opened so that the pressure medium can flow off «

Due to the arrangement of the leaf spring 26 between the bracing device 21 and the pin 2 attached to the pre-pledging cap 12? is achieved that from the pre-pledging cap maximum load absorbed compared to the load »that of the cap structure 10 of the expansion element 10,11 is received, is limited. In other words, each

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load from the canopy construction in excess of this limit 10 of the expansion element 10.11 is worn when the The supporting surface of the pre-pledging cap 12 has lowered to below the supporting surface of the cap structure 10.

In the event that the pre-pledged cap 12 should give way when the force F acting on its section on the working face side exceeds a certain value, the wedge angle oi can also be increased. This causes the force exerted on the tensioning device 21 from the rear end of the pre-pledging cap 12 to be broken down into force components due to the inclination, one of which acts via the piston rod 20 on the pressure cylinder 15 in its longitudinal direction, so that additional pressure is generated in the pressure cylinder when the Vorpfändkappe 12 is pivoted about the axis extending through the pin 17. In this case, a pressure limiting valve 21a is built into the pressure medium supply line to the pressure medium connection 2 $. This pressure relief valve opens when the pressure forces in the cylinder, as a result of the pressure forces acting on the end of the pre-pledging cap on the working face side, rise above a certain value in the manner described above.

The expansion element shown in FIG. 8 is constructed in the same way in many respects as the expansion element described above. The same reference numerals are therefore used for the parts that correspond to one another as in the case of the one in FIGS. 1-7 shown expansion element. In the device shown in Fig. 8 sum advancement and retraction of the pre-pledging cap 12, a double-acting hydraulic pressure cylinder 28 is provided which is attached to the cap structure 10 eats and engages with the free end of its piston rod on the pre-pledging cap 12. For pressing the

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Vorpfändkappe 12 against the hanging wall is another hydraulic Pressure cylinder 29 which is attached to the cap structure 10 via a bracket 30. The one for pressurization of the printing cylinder 29 serving. Pressure medium circuit can be provided with a pressure relief valve, so that too here the maximum load absorbed by the cap is limited. Instead of placing the printing cylinder 29 under the front one Section of the pre-pledging cap 12, an arrangement can also be selected in which the pressure cylinder 29 at the rear Section between the cap construction and the pre-pledging cap is arranged. In this case, the pressure cylinder 29 with its piston rod pointing downwards is attached to the cap structure " tion IO attached.

The pressure cylinder 29 can support the pre-pledging cap 12 directly, as shown in FIG. 7, or else indirectly, for example via a wedge bracing.

It is particularly emphasized that with the aid of the device according to the invention, the hanging end surface before "the expansion" element can be effectively supported and that this support for any desired extension path of the pre-pledging cap 12 can be achieved.

Patent claims:

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Claims (15)

PATENTANWALT BODE 4033 HÖSEL POST BOX TELEPHONE 02102-61701 TELEX 8585166 R 1 - 225 - 12 - P a t e η t a η s y rü ch e: 1. Pit extension element »which is provided with a hydraulically extendable Vorpfändkappe parallel to the hanging wall, characterized in that the Vorpfändkappe (12) of the extension element (10,11) located in the bracing between the hanging wall and lying in each lying between the largest and the smallest extension length Extension length can be pressed against the hanging wall, can be released from the hanging wall and can be extended or retracted again. Jk 2. pit support element according to claim 1, dad ur ch characterized in that on the cap structure _: (10) of the expansion element (10,11) a pressure cylinder (15; 28) serving for extending and retracting the pre-pledging cap (12) and one for Clamping or releasing the pre-pledging cap serving device (21; 29) are attached. 3. Pit lining element according to claim 1 and 2, characterized characterized in that the pre-pledging cap (12) is longitudinally displaceable in the cap structure (10) of the extension element (10,11) is stored. U. mine roof element according Anspruch.1 to 3, characterized w in that the Vorpfändkappe is provided with laterally protruding pins (IU), which engage in longitudinal slots serving as guides (13) in the cap structure (10). 5. Pit lining element according to claim 1 to * », characterized characterized in that the hydraulic pressure cylinder (15) is provided with laterally protruding pins (17) which are attached to brackets (16) with - 13 - 9 0 9 8 3 6/0921 BAD ORf _GiNAL PATENT ADVERTISER BODE - 4033 HÖSEL; POST BOX tELEFQN021 &2;i-61701;TELEX'8585 too '' ■ ' - 13 - the cap construction .; ilQ> - 3 "^ structural elements" (10, 11) are connected. 6. Grubenausbauelemsnt according to claim S, since you _; - ^v r -ch ''^i; -g '"e" k ^ e / rt η ζ e' i * c "h η et · that the consoles; (16) are provided with the pin Cl?) of the pressure cylinder (15) can be displaced 7. pit support element "according to claim 1 to 6j da'd'ü r-c'h characterized in that between the rear end of the Vorpfändkappe (12) and Öia Käpperiköristrüktiöh 'ClO) • a wedge of a zürn bracing the Vorpfändkappe" (12t against the Hanging ^{wall 1} serving "lter clamping device 'C 21> insert- -bär'ist.''-■■" - ""■■■■' ■■. '' ■ "- ■■ ■ · '■■; ■■■ ■ '■■' · '■■'"■■ 8. Pit lining element according to claim 1 to ^: / 7V d: - ^? ä you ^?; r 'c "h marked that between the pre-pledging cap (12) and the Varspannvörrichtüng (2i-] i öine- elastic transfer device (26) is arranged a" ■ " ^? ■ · - ^!>; * ■ 9. Pit support element according to claim 7, 'dkd ü'r'ä h' characterized in that the Elaean yielding device (26) is arranged between the 'wedge' of the bracing device '(21>"and the rear end section of the pre-pledging cap (12) - * ^c - "· ' ^r ' ^fi ""-''-'-'~" ^: ' - " ^"^; - 10, pit lining element according to claim 8 or "d ä du r ie characterized in that the guard device (26) is designed as a curved leaf spring which is attached to the pre-pledging cap (12) and resiliently on the wedge 3-clamping device (21) is applied so that the forces that serve to brace zuia via the leaf spring (26) 9 09836/0921 " BATH ORIGINAL PATENTANWALT BODE 4033 HÖSEL - POST BOX TELEPHONE 02102-61701 TELEX 8585166 - I ^s * - i - ■ on the rear end of the pre-pledging cap; C12> are transferred and this relative to the cap construction C1O> the external building element ($ 0.11) is pressed down » 11. pit excavation element according to claim 1 to 10 »dadu; rcb geke η η ζ eic h η et that the clamping device C2i> can be actuated by the hydraulic pressure cylinder; C15>" ^: 12. Pit lining element according to claim 1 to 11 _y dadur ch ge kenn'zeicli η eti that; the hydraulic pressure cylinder ClS) has two pistons ClSa, 15b) which can be extended and retracted in opposite directions to a common cylinder part, the ■. Its piston (15a) with the pre-pledging case Cl2> and the other piston · (15b> with the bracing device (21) connected 13. Pit support element according to claim 1 to 12 »because you rch geke η η; draw η et that the wedge of the; bracing device ¹ C 21) on an inclined surface (22) on the end portion of the pre-pledging cap C12 J-rests. 'IM .. pit lining element according to claim 13- ,, d: a _: by geke η η ζ e.ic h η et that the wedge angle (C ^) and the angle that the inclined surface (22) includes with the horizontal s <> are dimensioned that at a certain force acting on the mining impact end of the * pre-pledging cap (CT); the pledge cap C12) H yields.! 15. Pit lining element after. Claim 1 to W :, fd a through g e ke η n; z e i. c; h nert ^ atass i "to tighten the pre-pledging cap Cjl2) a hydraulic" pressure cylinder ClS; 29) is provided, on whose Druckrauili eiii pressure relief valve C2 ^ ä> connected*; ': i. : Elder-y ^ ^γ-γϊΓ:; . ? J ..: ..... b ^ ^k; η ^ 5ι BAD Originai 9 09836/09 ^ 1