AU738669B2

AU738669B2 - An apparatus for sucking dust by spraying high-pressure water in a sublevel caving hydraulic support for sublevel caving hydraulic support

Info

Publication number: AU738669B2
Application number: AU20702/00A
Authority: AU
Inventors: Jing TAI; Tao Tingyun; Jiang Xueyun
Original assignee: Yankuang Group Corp Ltd
Current assignee: Yankuang Group Corp Ltd
Priority date: 1999-10-19
Filing date: 2000-03-07
Publication date: 2001-09-20
Anticipated expiration: 2020-03-07
Also published as: AU2070200A; CN2396183Y

Description

n Our Ref:7465109 P/00/011 Regulation 3:2

AUSTRALIA

Patents Act 1990

ORIGINAL

COMPLETE SPECIFICATION STANDARD PATENT S. *5~

S..

Applicant(s): Address for Service: Yankuang Group Corporation No. 40 Fushan Road Zoucheng City Shandong 273500 People's Republic of China DAVIES COLLISON CAVE Patent Trade Mark Attorneys Level 10, 10 Barrack Street SYDNEY NSW 2000 Invention Title: An apparatus for sucking dust by spraying high-pressure water in a sublevel caving hydraulic support for sublevel caving hydraulic support The following statement is a full description of this invention, including the best method of performing it known to me:- 5020

P\WPDOCS\DYS

0 pecie\7465]09spec.doc-10 July 2001 -1- AN APPARATUS FOR SUCKING DUST BY SPRAYING HIGH-PRESSURE WATER IN A SUBLEVEL CAVING HYDRAULIC SUPPORT FOR SUBLEVEL CAVING HYDRAULIC SUPPORT The present invention relates to an apparatus for the suction of dust and like material.

"Long Tube Type High-pressure Water Spraying and Suction Dust Apparatus for Shearer" ZI, 96232320, CN 2282070Y, has been disclosed on The Gazette of the Chinese Utility Model, V61.14, Number 20.The object of the Utility Model patent is to further reduce the S 10 dust concentration around the shearer on the basis of the dust suppression by the inner and outer spraying system of the shearer. The apparatus consists of a long tube made of a steel i plate, fixed on the upper surface of the shearer along the longitudinal direction of the shearer. A spraying nozzle is fixed in the long tube. When high-pressure water supplied by S" a water pipe is sprayed through a nozzle, a negative pressure will be produced at an end of 15 the long tube so that dust is sucked and suppressed. The shortcomings of the patent are •°ooo Slong length of the tube, a big volume, a large suction resistance of air, more water consumption and high water pressure.

It is an object of the present invention to alleviate one or more of the shortcomings in the prior art.

According to one aspect of the present invention there is provided apparatus for the suction of dust and like material, the apparatus being suitable for use with a sub-level caving hydraulic support, the support including a canopy having a side shield, hydraulic legs adapted to carry the canopy, the canopy overlying a region between the hydraulic legs, a debris shield, a tail canopy, a linkage mechanism operatively connected to the debris shield and a caving door adjacent the tail canopy for the passage of caved material, the apparatus including two suction devices, one of said suction devices being disposed on the inner side of the side shield the canopy, the other of said suction devices being disposed in the region of said caving door; P:\WPDOCS\DYS~specie\7465 109sp=.doc-10 July 2001 -2each suction device including a spray pipe having an inlet end and an outlet end, a nozzle disposed within said spray pipe generally on the central axis thereof and spaced from the outlet end and a suction pipe operatively connected to the inlet end of said spray pipe; the parameters of the inner diameter D of the spray pipe, the distance L of the nozzle from the outlet end of the spray pipe, and the diffuse angle 0 of the spray from the nozzle meeting the following requirements: D< 2L.tan(O) said suction pipe for said one of said suction devices being in the form of a straight ooS* pipe having an open end operatively connected to the inlet end of the spray pipe and the other end being closed, a plurality of slots in the wall of the suction pipe along its length, baffle plates on the pipe wall below said slots; S 15 said suction pipe for said other of said section devices being in the form of a generally U-shaped pipe, one end thereof being operatively connected to the inlet end of the spray pipe, the pipe being operatively mounted to the support in the region of the ooSo

S

caving door.

Preferably, the nozzle is operatively connected to a nozzle socket by a staple connector, the other end of the nozzle socket being operatively connected to a high-pressure hose by a staple connector.

In one preferred form, the slots face generally towards the regions between the canopy and between the hydraulic legs.

Preferably, three slots are provided in the wall of said straight pipe, the width of the slots gradually widening towards the closed end thereof. Preferably, a generally wedge shaped slot is provided in a wall of said straight pipe width of the wedge shaped slot gradually 0 widening towards the closed end thereof.

P:\WPDOCS\DYS\spccic\7465]09spec.d-oc-l 0 July 2001 -3- In one preferred form, the U-shape pipe includes three cylindrical sections with two side cylindrical sections being operatively connected to a middle section generally at a right angle. In another form, the U-shape pipe includes three cylindrical sections with two side cylindrical sections being operatively connected to a middle section at an obtuse angle.

As compared with the prior art, the present invention in its preferred form has following advantages: 10 1. high-pressure water is sprayed to suppress and suck dust so that a stronger dust suppression is achieved; the apparatus of the present invention is of smaller volume, smaller space, lower water pressure, and less water consumption; 3. the apparatus of the present invention is of simple structure, low manufacture cost and is easy to be manufactured, handled, assembled and removed.

Preferred embodiments of the invention will be hereinbefore described with reference to 20 the accompanying drawings, and in those drawings: FIG.1 is a schematic view showing installation positions of the dust cleaner located between the hydraulic supports and the dust cleaner near the caved coal door.

FIG.2 is a front schematic view showing structure of dust cleaner located between the hydraulic supports according to the present invention.

FIG.3 is a sectional view showing the pipe for sucking dust of the dust cleaner located between hydraulic supports.

FIG.4 is a schematic view in the direction of arrow A in Figure 2 showing the pipe for P:\WPDOCS\DYS\spcdc\7465109spm.doc-IO July 2001 -4sucking dust of the dust cleaner located between hydraulic supports.

is a schematic view showing the pipe for sucking dust of the dust cleaner located between hydraulic supports.

FIG.6 is a schematic view showing other pipe for sucking dust of the dust cleaner located between hydraulic supports.

FIG.7 is a front schematic view showing dust cleaner located near the caved coal door of 10 the present utility model.

FIG.8 is a schematic view in the direction of arrow B in Figure 7 showing the dust cleaner located near the caved coal door.

FIG.9 is C-direction structure schematic view showing the dust cleaner located near the caved coal door.

is a structure schematic view showing other dust cleaner located near the caved coal door.

The present invention will be described in more detail by means of the embodiments shown in the attached Figures.

FIG. 1 shows installation positions of the high-pressure water suction dust apparatus for sublevel caving hydraulic supports in a sublevel caving support with a low caved coal door. The present invention includes two types of the dust cleaners: one located near the caved coal door, the other located between two hydraulic supports. The dust cleaner located between the hydraulic supports is fixed on the inner side of the side shield of the canopy and under the canopy of the hydraulic support. The dust cleaner located near the caved coal door is located under the tall canopy of the hydraulic support and near the caved coal door.

P:\WPDOCS\DYS\pcic \7463109spc.do-10 July 2001 An embodiment is shown in Figs 2 to 4, in which the dust cleaner is located between the hydraulic supports, which is a part of the apparatus for sucking dust by spraying highpressure water in a sublevel caving hydraulic support.

The dust cleaner located between the hydraulic supports consists of a spraying pipe a nozzle and a pipe for sucking dust etc. Both the spraying pipe and the pipe for sucking dust are straight and cylindrical pipes. A rear end of the spraying pipe(3) is connected to the pipe for sucking dust by a fixed tube (11) and fixed bolts (15) on the 10 fixed tube The nozzle is centered in the spraying pipe near it's rear end. The nozzle is connected to the nozzle socket by a staple connector. The nozzle socket is connected to an inlet bend pipe The other end of the inlet bend pipe (10) is connected to a high-pressure hose (17) by the staple connector. Staples of the staple *o connectors (9 and 16) are inserted into the staple connectors, respectively. The end of the 15 high-pressure hose (17) is connected to a high-pressure water cock. The high-pressure .oeeei water cock is controlled by a hydraulic non-return valve of the hydraulic support. The pipe for sucking dust is a straight pipe with a closed end facing towards the goaf Slots, i.e.

slots for sucking dust are provided on the wall of the pipe for sucking dust along its length direction. The slots for sucking dust comprise 3 slots The lengths of the slots are equivalent, but the widths thereof are widened gradually in the direction towards the closed end of the pipe for sucking dust. Baffle plates (12) are fixed on the wall of the pipe for sucking dust under the slot for sucking dust.

The parameters including the inner diameter D of the spraying pipe, the distance L from a nozzle to an outlet of a spraying pipe and the diffuse angle 0 of sprayed water must satisfy the following relation namely when the diameter of the cylinder formed by sprayed water is larger than or equal t 0namely when the diameter of the cylinder formed by sprayed water is larger than or equal P:\WPDOCS\DYS\specic\7465 I09spjo.doc-10 July 2001 -6to the inner diameter D of the spraying pipe, it will form a piston of sprayed water so that a higher negative pressure will be produced in the spraying pipe. For example, if the diffuse angle 0 of sprayed water is 300 and the inner diameter D is 80mm or 100mm, the distance L between the nozzle and the outlet of the spraying pipe should be 150mm 250mm.

The spraying pipe is mounted on a fastening plate with the front fastening end by bolts. Both the spraying pipe and the pipe for sucking dust are fixed on a shift (8) for pivoting the canopy of a hydraulic support with the front canopy by the fastening plate so that the dust cleaner provided between the hydraulic supports is arranged on the S 10 inner side of the side shield (14) of the canopy and the slots for sucking dust will be closely paralleled with the gap between the hydraulic supports.

Fig.6 shows a further embodiment of the pipe for sucking dust (18) of the dust cleaner located between the hydraulic supports, which is a pipe for sucking dust (18) with a wedged slot. The slot for sucking dust (19) on the wall of the pipe for sucking dust (18) is a slot with its width widened gradually towards the closed end of pipe for sucking dust, namely, a wedged slot. Other details are similar to the pipe for sucking dust of the above embodiment.

20 FIGS. 7 to 9 show a structure of the dust cleaner located near the caved coal door of a ooo i sublevel caving hydraulic support. The dust cleaner consists of a spraying pipe a nozzle a pipe for sucking dust The spraying pipe (24) is formed cylindrically and provided a fastening part on the outer side of its rear end. The rear end of the spraying pipe (24) is connected with the pipe for sucking dust (23) by the fastening part, the nut (20) and the bolt The pipe for sucking dust (23) comprises 3 straight sections connected in a U-shape. Two side sections, one is longer than the other, are connected to the middle section at a right angle. The end of the shorter side section is connected to the rear end of the spraying pipe (24) by the fastening part, the nut (20) and the bolt The nozzle is also centered in the spraying pipe at its rear end and connected to a nozzle socket by a staple connector. Then the nozzle socket is connected to a two-way pipe the other /1USi Z end of the two-way pipe (22) is connected to a high-pressure hose (17) by a staple P:\WPDOCS\DYSspecic\7465109spcc.doc-10 July 2001 -7connector. The staples of the staple connector (9 and 16) are inserted into two staple connectors, respectively. The other end of the high-pressure hose (17) is connected to the high-pressure water cock. The high-pressure water cock is controlled by a hydraulic nonreturn valve of the hydraulic support. In the same way, the parameters including the inner diameter D of the spraying pipe, the distance L from a nozzle to an outlet of a spraying pipe and the diffuse angle 0 of sprayed water must satisfy the following relation D 2L.tan().

10 For example, if the diffuse angle 0 of sprayed water is 300 and the inner diameter D is i 100mm or 120mm, the distance L between the nozzle to the outlet of the spraying pipe Sshould be 300mm 500mm.

The dust cleaner with U-shape pipe for sucking dust is fixed near the caved coal door on 15 the inclined lemniscate bars of a lemniscate mechanism of a hydraulic support and located near the caved coal door by a fastening plate on the outside of the U-shape pipe for sucking o dust, the U-shape fastening bolt (26) and nut The dust cleaner may also be fixed under the shield of the hydraulic support or the tail canopy.

FIG.10 shows a further embodiment of the U-shape pipe for sucking dust of the dust cleaner located near the caved coal door which comprises a U-shape pipe for sucking dust (27) formed in a trapezoid-support-shape and comprises 3 cylindrical sections. Two side cylindrical sections are connected to the middle section at an obtuse angle, the other is similar to the U-shape pipe for sucking dust The pipe for sucking dust (27) is propitious for reducing the airflow resistance at the two connector bends. Angle a is the angle between the side sections of the, trapezoid U-shape pipe for sucking dust (27) and the middle section.

Arc-shape pipe can be used for a U-shape pipe for sucking dust.

P:\WPDOCS\DYSspccicV/465109spcc.doc*I0 July 2001 -8- Working principle: both the dust cleaner located at the gap between the hydraulic supports and the dust cleaner located near the caved coal door are worked on the same principle. When supplying high-pressure water into the nozzle located in the spraying pipe with two open ends, the high-pressure water will be sprayed out from the front end of the nozzle to cover the coal dust before the nozzle. At the same time, a negative pressure is produced at the rear end of the spraying pipe so as to suck in air with airborne dust. Air with airborne dust is cleaned up by the sprayed water in the spraying pipe and then is sprayed out from the front end of the spraying pipe together with the sprayed water. When the parameters including the inner diameter D of the spraying pipe, the distance L from a 10 nozzle to an outlet of a spraying pipe and the diffuse angle 0 of sprayed water satisfy the following relation 9*D 2L tan(.) 15 a water piston will be formed by sprayed water in the spraying pipe so as to result a strong

S

negative pressure. When the water pressure is 15 MPa, the ratio of sprayed water to sucked air volume should be about 1:2500, namely when sprayed water is 10 L/min, sucked air is So

S

m3/min, which is enough to clear air near the dust resources of the hydraulic support.

:Water pressure supplying to the nozzle ranges from 5MPa to 17MPa.

S When the caved coal door is raised by actuating a control valve, high-pressure emulsion flowing into the cylinder for raising the caved coal door will be branched by a special pipe and flows into the hydraulic non-return valve for controlling the dust cleaner located near the caved coal door. Accordingly, the high-pressure water cock is actuated so that water is sprayed in the direction of the tail canopy through the nozzle provided in the spraying pipe.

The sprayed water catches dust produced from coal flowing into a conveyor in a support.

The negative pressure produced at the rear ends of the spraying pipe sucks in the air with airborne dust through a U-shape pipe for sucking dust.

Meanwhile a miner operates a control valve to move a hydraulic support, the hydraulic P:\WPDOCS\DYS\peic\7465109spcc.doc10 July 2001 -9non-return valve will actuate the high-pressure water cock so that water is sprayed through the spraying pipe towards the coal face to catch and suck in dust producing between the coal face and the front leg of the hydraulic support. The negative pressure produced at the rear end of the spraying pipe sucks in the air with airborne dust through the slots for sucking dusts on the straight pipe, and along the extending direction of the side shield.

Both sucked dust and water are sprayed out from the spraying pipe.

Machining and selection of the parts: the dust cleaner located between the hydraulic supports and the dust cleaner located near the caved coal door are mainly riveted joint 10 parts and welding parts. The spraying pipe is made of steel pipe. 4D 1.5 mm nozzle with wear resistance ceramic core manufactured by Wuxi Coal Machinery Factory may be selected for the nozzle.

Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be Sunderstood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.

Claims

1. Apparatus for the suction of dust and like material, the apparatus being suitable for use with a sub-level caving hydraulic support, the support including a canopy having a side shield, hydraulic legs adapted to carry the canopy, the canopy overlying a region between the hydraulic legs, a debris shield, a tail canopy, a linkage mechanism operatively connected to the debris shield and a caving door adjacent the tail canopy for the passage of caved material, the apparatus including two suction devices, one of said suction devices being disposed on the inner side of 10 the side shield the canopy, the other of said suction devices being disposed in the region of said caving door; each suction device including a spray pipe having an inlet end and an outlet end, a nozzle disposed within said spray pipe generally on the central axis thereof and spaced 00:0 from the outlet end and a suction pipe operatively connected to the inlet end of said spray pipe; the parameters of the inner diameter D of the spray pipe, the distance L of the nozzle from the outlet end of the spray pipe, and the diffuse angle 0 of the spray from the nozzle meeting the following requirements: 0000 0 000o 20 D< 2L.tan( 0 2 said suction pipe for said one of said suction devices being in the form of a straight pipe having an open end operatively connected to the inlet end of the spray pipe and the other end being closed, a plurality of slots in the wall of the suction pipe along its length, baffle plates on the pipe wall below said slots; said suction pipe for said other of said section devices being in the form of a generally U-shaped pipe, one end thereof being operatively connected to the inlet end of the spray pipe, the pipe being operatively mounted to the support in the region of the caving door.

2. Apparatus according to claim 1 wherein said nozzle is operatively connected to a P:\WPDOCS\DYS\pecic\7465109spc.doc-10 July 2001 11 nozzle socket by a staple connector, the other end of the nozzle socket being operatively connected to a high-pressure hose by a staple connector.

3. Apparatus according to claim 1 or 2 wherein said slots face generally towards the regions between the canopy and between the hydraulic legs.

4. Apparatus according to claim 1, 2 or 3 wherein three said slots are provided in the wall of said straight pipe, the width of the slots gradually widening towards the closed end thereof. l 0

5. Apparatus according to claim 1, 2 or 3 wherein a generally wedge shaped slot is provided in a wall of said straight pipe width of the wedge shaped slot gradually widening towards the closed end thereof.

6. Apparatus according to claim 1 wherein said U-shape pipe includes three cylindrical sections with two side cylindrical sections being operatively connected to a too* middle section generally at a right angle.

7 Apparatus according to claim 1 wherein said U-shape pipe includes three 0 20 cylindrical sections with two side cylindrical sections being operatively connected to a middle section at an obtuse angle.

8. Apparatus for the suction of dust and the like substantially as hereinbefore described with reference to the accompanying drawings. DATED this 10th day of July, 2001 YANKUANG GROUP CORPORATION By Their Patent Attorneys DAVIES COLLISON CAVE