EP2052129A1

EP2052129A1 - A shearer loader for underground mining comprising a spray system

Info

Publication number: EP2052129A1
Application number: EP07801730A
Authority: EP
Inventors: Sebastian M. Mundry; Rainer Marek; Johannes Wesselmann
Original assignee: Bucyrus Europe GmbH; Bucyrus DBT Europe GmbH
Current assignee: Caterpillar Global Mining HMS GmbH
Priority date: 2006-08-18
Filing date: 2007-08-17
Publication date: 2009-04-29
Anticipated expiration: 2027-08-17
Also published as: AU2007286414A1; DE102006038939B4; US7954904B2; RU2009109711A; CN101490365A; WO2008019866A1; US20100237683A1; ATE491079T1; DE102006038939A1; CN101490365B; RU2441156C2; AU2007286414B2; PL2052129T3; EP2052129B1; DE502007005908D1

Abstract

A shearer loader for underground mining, the shear loader comprising a shearer loader body, at least one cutting drum fastened to a supporting arm joined to the loader body, a first drive motor for moving the shearer loader and a second drive motor for moving the cutting drums, a cooling water circuit for cooling the first and second drive motors, the cooling water circuit including an inlet and a return line, a spray system including at least one spray water circuit, the spray system including a feed line fluidly connecting a common water connection to the cutting drums, the spray system further including a valve in the feed line for switching the spray water circuits on and off, a control valve connected between the feed line of the spray water circuit and the return line of the cooling water circuit, the control valve allowing selective flow from the cooling water circuit to be directed to the cutting drums.

Description

ROLLER LOADERS FOR UNDERGROUND MANUFACTURE WITH BEDUSUNGSYSTEM

The invention relates to a shearer for underground mining, with a roller loader body, each with a fixed to a support arm cutting roller for each direction of the shearer loader, with drive motors for moving the shearer and for moving the cutting rollers, with at least one cooling water circuit for cooling the drive motors, with a a Bedüsungswasserkreislauf with a supply line to the tools of the cutting rollers comprehensive Bedüsungssystem, with a preferably common water connection for the water circuits and associated with the water circuits valves for connecting or disconnecting the water circuits.

In the underground mining of minerals, especially in the underground coal extraction is prescribed to spraying jet water on nozzles for dust control on the degraded excavation front. A majority of the Strebbedüsung is effected here by means of the expansion point, where at appropriate locations such as the caps nozzles are mounted, which can be operated with high-pressure water of about 150-200 bar. For example, reference is made to DE 195 37 448 Al.

The performance increase achieved with shearers increases the formation of dust and the risk of ignition in the cutting companies. While initially the cutting rollers were sprayed from the outside via water nozzles from the support arm, an interior spraying now takes place, in which each tool on the cutting rollers is assigned a water nozzle that can be supplied with water for spraying. The spraying of the chisel tools takes place at pressures up to about 50 bar. The lower water consumption of the spraying sys- tems achieved by the internal spraying now makes it possible to use some of the cooling water in hoses. lead out of the longwall via the cable drag chain (see www.steinkohleportal.de).

From DE 30 200 46 Al a roller loader is known, in which the the shearer fed zugefuhrte water is divided at a branch in a branch for the Kuhlwasserkreislauf and a branch for the Bedusungswasserkreislauf, the two line branches behind the units to be cooled in Kuhlwasserkreislauf and behind Flow control valves in both subcirculation are fed to a 4/3 way valve, to the Bewusigkeit in Anhangig- speed of the direction of travel of the shearer on the respective leading cutting roller exclusively with the flowing from the Bedusungswasserkreislauf water and on the trailing cutting roll exclusively with the zugefuhrten from the Kuhlwasserkreislauf water to be able to make. Since accumulates on the trailing roller less by means of Bedustung dust precipitated, the Bedusung on the trailing roller should be done only with the smaller amount of water from the Kuhlwasserkreislauf.

The object of the invention is to improve the effectiveness of the water supply systems of shearer loaders.

To solve this and other objects according to the invention it is proposed that in generic Schatt loaders in return lines of Kuhlwasserkreislaufs each connected to one of the supply lines switching valve is arranged, via which the Kuhlwasser, if necessary, the cutting rollers is fed as Bedusungswasser. In the shearer according to the invention, therefore, the cooling water can be supplied, if necessary, by opening the switching valves the Bedusungsdusen on the cutting rollers and used there as Bedusungswasser. Thus, with an overall lower required water throughput for the shearer loader, an effective supply of conditioning water which can be adapted to the respective weather conditions and mining conditions can be provided. Since the cooling water is supplied only as needed the scrub rollers, at the same time swelling of the recumbent can be largely avoided and it is not more necessary to pump out excess Bedüsungswasser from the longwall ago ^¬ .

In the particularly preferred embodiment according to the invention, a separate switching valve is provided for each cutting roller. It is particularly advantageous if both switching valves are each connected via an intermediate line to the associated supply line for one of the cutting rollers, preferably each supply line is provided before the inflow of the intermediate line with a valve for separate connection or disconnection of the Bedüsungswasserkreislaufs and further preferably with a flow control valve , In this embodiment, on the one hand via the flow control valve, the cutting rollers exclusively on the Bedüsungswasserkreislauf supplied amount of water are set and on the other it is ensured that, if necessary, in excess dust and both the Bedüsungswasser from the Bedüsungswasserkreislauf and the cooling water from the cooling circuit fed to the cutting rollers as Bedüsungswasser can be.

Further preferably, in the intermediate lines and / or in the Kühlwasserzuführleitungen individual or possibly all with the cooling water from the cooling water system to be cooled drive motors each a flow control valve may be arranged to regulate the recorded and possibly delivered to the Bedüsungssystem amount of water as optimally as possible. It is particularly advantageous if individual or all flow control valves can be controlled or regulated for a metered admission of the cutting rollers with Bedüsungswasser. The control can be implemented, for example, via a higher-level control unit, such as a control unit. the longwall control or the like. be effected.

Expediently, downstream of the water connection, a pressure limiting valve and / or a pressure regulating valve are arranged in the common water inlet to both water circuits in order to recognize or avoid malfunctions by exceeding or falling below the amount of water and water pressure for spraying which may have been set by the mines. For example, if the water supply is too low, a dust protection threshold could be exceeded, which is why the Extraction machine on detection of this hazardous condition should then be switched off or reduced in their performance. An overshoot or undershoot can also be an indication of blockage of the nozzles or other malfunctions. In order to reliably detect this, it is also expedient if a volumetric flow sensor is arranged upstream of the pressure limiting valve. In order to avoid contamination of the circuit and clogging of the nozzles, it is also advantageous if a water filter, preferably a back-flow filter, is arranged in the water inlet upstream of the volume flow sensor. It is also expedient if, downstream of the pressure-limiting valve, a branch is formed which, with one branch into the cooling-water circuit and with one or preferably two branch-lines, discharges into separate pressurized water circuits for the individual cutting rollers.

In the particularly preferred embodiment, the Bedusungs system has a first Bedusungswasserkreislauf for a cutting roller and a separate second Bedusungswasserkreislauf for the other cutting roller, the cooling water to the cutting rollers via the one or at least one connected to the supply lines switching valve when open Switching valves and valves open as an additional amount of Bedus- water or with closed valves and open switching valves as exclusive Bedusungswasser is supplied or is supplied. By dividing the supplied water into separate Bedusungswasserkreislaufe for both cutting rollers and, if necessary, connection or connection of the water from the cooling water circuits a much more effective and optimized in terms of water consumption control Bedusung can be realized. It may be sufficient to arrange for each subcircuit in the Bedusungswasserkreislauf and / or Kuhlwasserkreislauf each exactly one valve and a switching valve to make the Bedusung optional only with Kuhlwasser, only with Bedusungswasser or with the flow rates of Kuhl- and Bedusungswasser.

According to a further embodiment, in the Bedusungswasserkreislauf for each cutting roller at least two independently can be arranged controllable valves between the water connection, in particular between the associated branch line of Bedüsungswasserteil- circulation and the respective supply and / or cooling water circuit can be arranged for each cutting roller at least two independently controllable switching valves between the return line and the respective supply line to the cutting roller. By separately controlling the respective switching valves and valves, the cutting rollers then actually supplied amount of water for the spraying not only be set differently for the individual cutting rollers, but the amount can also be gradually adjusted with little circuit complexity to the needs, only to the Spraying the amount of dust required in the face dust, while the remaining water through the return lines and a return hose from the strut is led out again. For further optimization and improvement of effectiveness, a flow control valve can be assigned to each valve in the spray water circuit.

In order to increase safety in the extraction striving, it is also possible, preferably in the water inlet, to arrange a diversion to a preferably manually switchable extinguishing spray. Alternatively or additionally, downstream of the pressure limiting valve, a branch can be inserted into a camera cleaning system which can be switched on or off for cleaning, e.g. be arranged a surveillance camera for the longwall or the shearer.

Further advantages and embodiments of a shearer according to the invention will become apparent from the following description of exemplary embodiments shown schematically in the drawing. In the drawing show:

Fig. 1 shows a simplified schematic plan view of a shearer for underground mining;

FIG. 2 is a diagram of the water circuit provided with a roller loader according to the invention according to FIG. Run for the cooling and spraying according to a first embodiment; and

Fig. 3 is a diagram of the water circuits for cooling and spraying according to a second embodiment.

In Fig. 1 is a highly simplified schematically illustrated a shearer 1 in particular for coal mining in underground mining, comprising a Walzenladerkörper 2, which is movable on a parallel to the conveyor (not shown) laid in the longwall shoot. On the roller loader body 2 each support arms 3 are fixed for both directions of travel of the shearer 1, where in turn for each direction of travel, a cutting roller 4 is rotatably mounted, which is equipped with a variety of Schrammißeln (not shown) as processing tools with which to dismantle at the mining front Minerals such as coal in particular can be won. In the roller loader body 2, in the support arms 3 and in the cutting rollers 4 are not shown in Fig. 1, water circulation systems u.a. integrated with a cooling water circuit for the drive systems of the individual units and motors of the shearer loader 1 and a Bedüsungssystem for the cutting rollers 4, the structure will now be explained with reference to FIG. 2.

In Fig. 2, only the two cutting rollers 4 are indicated for the respective directions of travel of the shearer, wherein in the schematic representation of FIG. 2 it can be seen that both cutting rollers 4 are provided with a plurality of nozzles 5, preferably the processing tools directly are assigned and sprayed on the spray water for dust control during the extraction work. To supply the nozzles 5 with spraying water, the shearer is supplied via at least one hose, which is preferably laid parallel to the trailing cable for the electrical power supply of all units of the shearer, water, which is supplied via a common for all water circuits 10 inlet 11. It may be preferred way to act a low pressure input for water with an average pressure of about 35-40 bar at a flow rate of, for example, about 300 L / min. Downstream of the water inlet 11, a jerk filter 12 is arranged in the water circuit 10, can be filtered through the impurities in the zugefuhrten water to prevent contamination of the water lead to blockages in the partial circuits or blockages of the nozzle. Again downstream of the backflow filter 12, a combined flow / water pressure monitoring system 13 is switched on in the water circuit 10, which comprises a flow sensor 14 and a pressure sensor 15 to determine the current pressure P and the current flow rate Q and a non-illustrated signal lines also not shown higher-level control and evaluation device to signal. Downstream of the monitoring system 13, a pressure control valve 16 are arranged with downstream pressure relief valve 17, with which the pressure of the water to the desired range between 35 bar and 40 bar can be controlled.

Downstream of the two valves 16, 17 is a Stromungsabzweigung or a Stromungsteiler 18 is arranged, from which a line branch 19 to a Kuhlkreislauf 30 and two further branch lines 20A and 2OB each to a switching valve 21A, 21B lead, by actuating electromagnetic valves a common pilot block 22 can be switched to supply the Bedu- sungswasser if necessary either via the branch line 2OA with open valve 21A of a cutting roller 4 or via the other branch line 2OB with open valve 21B of the other cutting roller 4. Each of the valves 21A, 21B is preceded by a quantity regulating valve 22A, 22B in order to be able to reduce the amount of pressurized water supplied to the respective cutting roller 4 via the supply lines 23A or 23B when the switching valve 21A, 21B is open to an appropriate value , A quantity limitation can be done here, for example, to a maximum of 45 liters / min. The branch 18 divides the supplied via the inlet 11 water flow, respectively, each in a separate Bedusungswasserkreislauf 25A for the one cutting roller 4 and 25B for the other cutting roller 4, depending on the weather direction or due to other conditions, the Flow rate of Bedusungswassers on the Bedusungskreislaufe 25A, 25B can be set differently.

The branch line 19 behind the branch 18 mouths into the generally designated by reference numeral 30 Kuhlwasserkreislauf, which in turn may include part cycle 3OA for a cutting roller 4 and 3OB for the other cutting roller 4. Each partial circuit 3OA, 3OB can be provided with a plurality of cooling units for, for example, cutting roller drive motors 31, winch drive motors 32 for the respective direction of travel, movement motors 33 for the support arms, and for further system components 34 to be cooled, such as pumps. Each individual drive motor 31, 32, 33 or each individual system component 34 to be cooled can be assigned a quantity control valve 35, by way of which the respectively supplied quantity of cooling water can be set individually. The cooling water from the cooling water circuit 3OA can be supplied via a return line 36A and the cooling water of the cooling water circuit 3OB can be supplied via a return line 36B to a common return hose 41, via which cooling water that is no longer needed is led out of the longwall. Each of the return lines 36A, 36B is assigned a respective switching valve 37A, 37B, which via a check valve 38 secured intermediate line 39A, 39B in one of the supply lines 23A, 23B to the cutting rollers 4 to, if necessary, a supply of Kuhlwassers from the respective Kuhlwasserkreislauf 3OA or 3OB to allow the associated cutting roller 4. Thus, by opening the switching valves 37A and 37B, respectively, with the valves 21a, 21B open in the circulation circuits 25A, 25B, the amount of pressurized water supplied to the respective cutting rollers 4 can be increased by the amount of cooling water, or the conditioning can be achieved by simultaneously closing the valves 21A, 21B if necessary, only with the cooling water previously used for cooling. By suitable control of the quantity control valves and the switching valves, a metered supply of water for conditioning or cooling water to the cutting rollers 4 can be achieved. The additional amount of water from the Kuhlwasserkreislauf 3OA or 30B can then also the cutting rollers 4 are supplied, for example, if the respective cutting rollers 4 associated Pressure difference measuring systems 40 indicate an increase in the differential pressure and thus clogging of the nozzles in the cutting rollers 4.

In the exemplary embodiment shown, the water circuit 10 further comprises a camera cleaning system 50 which can be actuated via a branch line 51 and a valve 52 in order, for example, to clean the lenses of surveillance cameras, and a fire extinguishing system 60 with a plurality of nozzle groups 61, the cutting motors and associated with the Walzenladerkorper. The operation of the fire extinguishing system 60 is carried out manually via manual control valves 62 and a pilot operated valve 63 and the Loschsystem 60 is connected via a branch line 64 directly to the water inlet 11 upstream of the jerk filter 12.

Fig. 3 shows in a second hydraulic plan an alternative embodiment for the design of the water circuit for a combined Bedusungs- and Kuhlsystem in a shearer loader according to Fig. L ^" From the shearer loader in Fig. 3, only the two cutting rollers 104 are shown with the plurality of nozzles The water supply of all the water circulation 110 takes place, as in the previous exemplary embodiment, via a central water inlet 111, from which a branch line 164 to a preferably manually activatable fire extinguishing system 160 flows, while the main amount of water here first flows to a flow / water pressure monitoring system 113 and then as in the previous embodiment, a main branch 118 flows in. As in the previous exemplary embodiment, the amount of water at the main branch 118 via a branch line 119 is supplied to a Kuhlwasserkreislaufs designated generally by reference numeral 130, which in turn here has two Kuhlwasserteilkreislaufe 130A, 130B. However, subgroups are again formed in each of the two partial circuits 130A and 130B, respectively, for the cooling water flow rate of the two cooling units 131, eg drive motors, via a first return line 136A to a first switching valve 137A and the cooling water flow rate of the units designated by reference number 132 via a return line 186A a second switching valve 187A to supply. An identical structure is found in the second pitch 130B of the coolant water circuit 130 with the switching valve 137B in the return line 136B and the switching valve 187B in the return line 186B. In the initial position, all of the switching valves 137A, 137B, 187A, 187B are switched in such a way that the water from the individual return lines 136A, 136B, 186A, 186B flows into the return hose 141 and can be led out of the shearer or strut. Each one of the switching valves 137A, 187A, 137B, 187B, however, may be switched, if necessary independently of all other switching valves and valves, such that the respective water flow from the associated return line, eg 136A at the switching valve 137A, not the return hose 141, but the feed line 123A (or 123B in Kuhlwasserkreislauf 130B) to one of the two cutting rollers 104 flows. The inflow into the supply lines 123A, 123B takes place downstream, ie behind the valves of the Bedusungswasserkreislaufe, via intermediate lines, which are secured by check valves 138.

Also, the Bedusungswasserkreislauf is divided in the exemplary embodiment shown in two separate Bedusungswasserkreislaufe, namely in the Bedusungswasserkreislauf 125A for the left in Fig. 3 cutting roller 104 and the second Bedusungswasserkreislauf 125B for the right in Fig. 3 cutting roller 104. The volume flow distribution takes place at the main branch 118 via the branch lines 120A and 120B, respectively. Notwithstanding the first exemplary embodiment, two valves 121B, 171B with upstream quantity control valves 122B, 172B are now arranged both at the branch line 120A for the water supply circuit 125A two separately controllable valves 121A, 171A with upstream flow control valves 122A, 172A and in the branch line 120B for the Bedusungswasserkreislauf 125B to be able to adjust the amount of Bedusungswasser in each Bedusungswasserkreislauf 125A, 125B by opening or closing one or both associated switching valves 121A, 171A different. The inflow from the Kuhlkreislaufen downstream, ie, behind the valves 121A, 121B, 171A, 171B of the Bedusungswasserkreislaufe 125A, 125B, on the secured by means of check valves 138 intermediate lines. Because both the valves 121A, 171A and the switching valves 137A, 187A can be switched independently of each other via a switching device not shown here, according to the embodiment. Fig. 3 already for the cutting roller 104 in the left, with "A" respectively designated partial circuit 16 different settings for the amount of Bedüsungswasser. The same applies of course to the right cutting roller 104 behind the Bedüsungswasserkreislauf 125B and the cooling water subcircuit 130B. In the second embodiment, the spray water may be wholly or partly from the associated spray water circuit 125A or 125B, exclusively or partially from the cooling water circuit 130A, 130B, or from both sub-circuits. The arrangement of further switching valves or valves, the adjustment for optimizing the cutting rollers 104 ultimately supplied Bedüsungswassers can be adjusted more precisely. Since the switching valves of the cooling water circuit have a connection to the return line 141, it can be ensured at the same time that temporarily not required for a spray water from the shearer and thus out of the longwall can be led out again.

Those skilled in the art will recognize from the foregoing description numerous modifications which are intended to be within the scope of the appended claims. It is understood that the system can work at other pressures and that additional Mengenregelventi- Ie example, in the intermediate lines may be present in order to regulate the cutting rollers supplied amount of Bedüsungswasser even more optimal. The number of valves and switching valves present in each circuit or subcircuit may vary and e.g. separate switching valves are provided for each line branch in the cooling water circuit, which cooperate with a single or with more than two valves in Bedüsungswasserkreislauf to adjust by separate control of the valves and switching valves, the water supply of the individual cutting rollers, if necessary.

Claims

Patent claim:

1. Roller loader for underground mining, with a roller loader (2), each with one on a support arm (3) fixed cutting roller (4) for each direction of travel of the shearer loader, with drive motors (31, 32) for moving the shearer and the cutting rollers (4), with a Kuhlwasserkreislauf (30) for cooling the drive motors (31, 32), with a at least one Bedusungswasserkreislauf (25A, 25B), each with a feed line (23A, 23B) to the tools of the cutting rollers (4) comprehensive Bedusungssystem, with a common water connection (11) for the water circuit (10) and with the water circulation associated valves (21A, 21B) for connecting or disconnecting the circuit, characterized in that in return lines (36A, 36B) of the Kuhlwasserkreislaufs (30) each one to one of the supply lines (23A, 23B) connected switching valve (37A, 37B) is arranged, via which the cooling water, if necessary, the cutting rollers (4) is fed as Bedusungswasser.

2. shearer according to claim 1, characterized in that for each cutting roller (4), a separate switching valve (37 A, 37 B) is provided.

3. shearer according to claim 1 or 2, characterized in that both switching valves (37A, 37B) are each connected via an intermediate line (39A, 39B) to the associated supply line (23A, 23B) for one of the cutting rollers (4), preferably each supply line (23A, 23B) is provided with a valve (21A) for switching on or off before the supply of the intermediate line (39A, 39B) and a flow control valve (22A, 22B).

4. shearer according to one of claims 1 to 3, characterized in that in the intermediate lines and / or in the Kuhl- water supply lines of individual or all drive motors (31, 32, 33, 34) each flow control valves (35) are arranged.

5. shearer according to claim 4, characterized in that individual or all flow control valves (22A, 22B, 35) for a metered admission of the cutting roller (4) can be controlled or regulated with Bedüsungswasser.

6. shearer according to one of claims 1 to 5, characterized in that downstream of the water connection (11) a pressure relief valve (17) or a pressure control valve (16) in the common water inlet to both circuits (25A, 25B, 30) is arranged.

7. shearer according to claim 6, characterized in that upstream of the pressure relief valve (16) a flow sensor (13) is arranged.

8. shearer according to claim I ₁ characterized in that upstream of the volume flow sensor (13) a water filter, preferably a backwash filter (12) is arranged in the water inlet.

9. shearer according to one of claims 6 to 8, characterized in that downstream of the pressure limiting valve, a branch (18) is formed, which with first branch lines

(20A, 20B) in preferably separate Bedüsungswasserkreisläufe (25A, 25B) for each cutting roller (4) and with another branch (19) in the cooling water circuit (30) opens.

10. shearer according to one of claims 6 to 9, characterized in that downstream of the pressure relief valve (16) a branch is arranged in a switched on and off camera cleaning system (50).

Roller shearer according to one of claims 1 to 10, characterized in that the spraying system has a first jet water circulation circuit (25A) for the one cutting roll (4) and a separate second jet water circulation circuit (25B) for the other cutting roll (4) the cooling water zen (4) via the one or in each case at least one of the supply lines (23A, 23B) connected switching valve (37A, 37B) with open switching valves (37A, 37B) and opened valves (21A, 21B) as an additional amount of Bedüsungs- water or with closed valves (21A, 21B) and open switching valves can be supplied as exclusive Bedüsungswasser.

12. shearer according to one of claims 1 to 11, characterized in that in the Bedüsungswasserkreislauf for each cutting roller (104) at least two independently controllable valves (121A, 171A, 121B, 171B) between the water connection

(111) and the respective supply line (123A, 123B) are arranged.

Roller shear according to one of claims 1 to 12, characterized in that in the cooling water circuit for each cutting roller (104) at least two independently controllable switching valves (137A, 187A, 137B, 187B) between the return line (136A, 186A, 136B, 186B ) and the respective supply line (123A, 123B) are arranged.

14. A shearer according to claim 12 or 13, characterized in that each valve (121A, 121B, 171A, 171B) in the Bedüsungswasserkreislauf a flow control valve (122A, 122B, 172A, 172B) is associated.

15. shearer according to one of claims 1 to 14, characterized in that in the water inlet a branch to a preferably manually switchable Feuerlöschbedüsungssystem (60) is arranged.