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Title:
ROADHEADER RIPPING HEAD WITH A COOLING DUCT
Document Type and Number:
WIPO Patent Application WO/2017/204665
Kind Code:
A1
Abstract:
Utility model of the structure of the roadheader ripping head employed for driving headings in underground mining. The ripping head (1) has a tight chamber (11) with inlet (15) and outlet (16) terminals for the cooling agent fixed to the external surface (10) of the frontal end (9), and both the inlet (15) and outlet (16) terminals as well as the ducts (23, 24) routed to them, feeding and discharging the cooling agent, are located in the upper longitudinal conduit (22) of the body (2) closed from the above with a detachable lid (25). The interior of the chamber (11) is beneficially divided with partitions (19), essentially parallel to the side plates (18) equipped with interchangeably distributed ports (20) directing the labyrinth-like flow of the cooling agent.

Inventors:
PIETRAS, Ryszard (ul. Uchylany 56, 43-430 Pierściec, PL)
RABUCZEWSKI, Bogdan (ul. Czwartaków 1/13, 44-121 Gliwice, PL)
ŚCIERSKI, Adam (ul. Kokota 4, 40-748 Katowice, PL)
Application Number:
PL2016/000057
Publication Date:
November 30, 2017
Filing Date:
May 23, 2016
Export Citation:
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Assignee:
BUMECH S.A. (ul. Krakowska 191, 40-389 Katowice, PL)
International Classes:
E21C35/23
Foreign References:
US4289357A1981-09-15
GB996962A1965-06-30
US3353871A1967-11-21
US4076316A1978-02-28
EP0180573A11986-05-07
PL180915B12001-05-31
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Claims:
Protective claims

1. The ripping head of the roadheader, which is the end of the extension arm in which its body is connected in a detachable manner with the body of the drive and coupled with the drive shaft of the drive by means of an overload coupling, and which is equipped on its free end with two ripping components on both sides, with a common rotation axis perpendicular to the longitudinal axis of the extension arm, is characterised by the fact that on the external surface (10) of the frontal end (9) it has a fixed tight chamber (11 ) equipped with inlet (15) and outlet (16) terminals for the cooling agent, and both the inlet (15) and outlet (16) terminal as well as the ducts (23, 24) feeding and discharging the cooling agent are located in the upper longitudinal conduit (22) of the body (2) closed from above with a detachable lid (25).

2. The head, acc. to claim 1, is characterised by the fact that the chamber (11) is formed by an external plate (12) parallel to the external surface (10) of the frontal end (9), welded in its upper part with its transverse side (13) to the strip (14) equipped with inlet (15) and outlet (16) terminals, and welded in its lower part with its transverse side (17) to the external surface (10) of the frontal end (9) of the body (2), and the created space of the chamber (11) interior is closed tightly from both sides, welded with terminal side plates (18), and the space of the chamber (11) interior is divided by means of partitions (19), essentially parallel to the side plates (18), equipped with interchangeably distributed ports (20).

3. The head acc. to claim 1 or 2 is characterised by the fact that the chamber (11) has a circumferential length resulting from the wrapping angle (a) of the external surface (10) of the frontal end (9) with value close to 240° in relation to the rotation axis (0;) of the ripping components (21).

4. The head acc. to claim 1 is characterised by the fact that the body (2) near the connector flange (3) of the drive is equipped with openable windows )6) in both side walls (5), providing access to the overload coupling (7) connecting the drive shaft with the ripping head (1) shaft.

Description:
ROADHEADER RIPPING HEAD WITH A COOLING DUCT

The subject of the patent is a ripping head of the roadheader used to drive headings in underground mining.

Roadheaders getting unmined coal by means of ripping components mounted at the end of the extension arm housing the drive are known and commonly employed to drive headings. The free frontal end of the extension arm usually is equipped with two bearing-mounted ripping components perpendicular to its longitudinal axis. In order to decrease dusting during rock mining, the ripping components are equipped with water nozzles spraying the cutters with water fed through ducts bored in the drive shaft of the components. In addition to reduction of dusting and extinguishing of mining cutter sparks, the water sprinkling the mining zone indirectly cools down the body of the ripping head from the outside. This cooling is, however, insufficient, especially in case of mining of rocks with significant compactness, when the loads transferred by the ripping head cause heating up of the oil filling the head extension as well as worse lubrication of the bearings in which the drive shaft of the ripping components is assembled. This, on the other hand, worsens the performance parameters of the roadheader and results in necessary breaks preventing failures.

The problem regarding cooling of functional blocks of long- wall shearers is solved by the cooling-sprinkling system, acc. to the Polish invention PL 180915. In this system, the water, prior to its supply to the sprinkling nozzles of the long-wall shearer, is directed to the cooling circuit of the particular shearer assemblies. The water from the coolers of these cooling circuits flows down to the tank equipped with a sweep valve and is supplied, by means of a water pump, to the ducts feeding it to the sprinkling nozzles distributed on the ripping components.

The objective of the patent is development of such a ripping head structure of the roadheader that will allow to employ the water used for sprinkling of the mining zones for pre-cooling of the extension arm ripping head mechanisms.

The essence of the patent is that on the outer surface of the frontal end of the extension arm there is a fixed chamber equipped with an inlet terminal and outlet terminal for the cooling agent, usually water, whereas both the inlet and outlet terminals as well as the cooling agent feeding ducts are placed in the upper longitudinal duct of the ripping head, closed from above with a detachable lid.

It is preferable if the chamber is formed by a plate, parallel to the external hemmed surface of the frontal end, welded in the upper part with its transverse side to the strip equipped with inlet and outlet terminals and welded with its lower transverse part in the further part to the external surface of the frontal end of the body oval. The resulting space of the chamber interior is closed tight from both sides with the welded terminal side plates, and the internal space of the chamber is divided by means of partitions, essentially parallel to the side plates, equipped with interchangeably distributed ports.

Favourable cooling parameters are obtained when the length of the chamber measured along its circumference resulting from the wrapping angle of the external surface of the frontal end of the extension arm of 240° in relation to the axis of ripping components.

In addition, it is beneficial if the body of the ripping head near the connector flange of the drive is equipped with openable windows in both side walls, providing access to the overload coupling, connecting the drive shaft with the ripping head shaft, without head disassembly, thus enabling also disconnection of the ducts of the ripping head cooling circuit.

The essential benefits of the ripping head according to the said patent consist in the fact that it has a circulating closed system of the cooling agent, wrapping around the surface of its frontal end where heat emission from the inside of the body of the ripping head is the most intensive. Thus, the intense cooling involves both the head lubricating oil as well as the bearings in which the ripping components are mounted. The structure of the welded chamber with opposing ports results in formation of a relatively great length of the stream of the cooling agent flowing around the free end of the head which is conducive to increase of heat collection. Thus, it is beneficial to form a chamber for the cooling agent that has the largest possible wrapping angle of the free end of the ripping head. The cooling agent, most frequently water, after flowing between the inlet tenninal and the outlet tenninal of the chamber, and after collection of heat by the head body walls, is fed to the rundown tank from where it is pumped to the sprinkling circuit. The ripping head based on the patent can have a body that is factory- fitted with a chamber as well as longitudinal closed conduit for ducts feeding the cooling agent, however it is also possible to adjust the already operating heads for this purpose if they are not equipped with a cooling system, which would be a significant advantage of the structure based on this patent.

The patent is presented in the drawing where fig. 1 presents the ripping head in spatial view, with partially uncovered chamber partitions, fig. 2 - ripping head in longitudinal section through the longitudinal axis of the extension arm, and fig. 3 - ripping head in simplified view from above, with a partially open chamber for the cooling agent.

Ripping head 1 (fig. 1) has a corpus 2 which, on one side, is equipped with a mounting flange 3, with an unillustrated screw drive 4, and adjacent to the flange 3 on both side walls 5 of the body 2, it is equipped with openable windows 6 providing access to the overload coupling 7 (fig. 2), connecting the drive shaft with the ripping head 1 shaft 8. On the other, frontal end 9, on the outer surface 10 of the body 2, there is a fixed chamber 11 consisting of an external plate 12, in a parallel position over the curved external surface 10 of the body 2, fitted with its upper transverse side 13 to the strip 14 equipped with inlet 15 and outlet 16 terminals (fig. 3), and with its transverse side 17 - to the external surface 10 of the body 2, as well as of terminal sides of side plates 18 limiting the chamber 11 , with partitions 19 between them. The partitions 19 are parallel to the side plates 18 and have interchangeably distributed ports 20 at their ends, forming a labyrinth-like route of flow of the cooling agent through the chamber 11. The side plates 18 and partitions 19 are set on planes essentially perpendicular to the rotation axis Oi of the ripping components 21 which, on the other hand, is perpendicular to the longitudinal axis C of the extension arm. Chamber 11 surrounds the external surface 10 of the body 2 on its frontal end 9, at the wrapping angle a close to 240° around the rotation axis Oi of the ripping components 21. Moreover, the body 2 of the ripping head 1 is equipped with an upper longitudinal conduits 22 where conduits 23, 24 are located which feed and discharge the cooling agent and which are routed to the inlet 15 and outlet 16 terminals, where the longitudinal conduit 22 is covered with a detachable lid 25 mounted to the body 2.