阅读说明：本技术 煤矿液压支架组合阀体装置 (Combined valve body device of coal mine hydraulic support ) 是由 李磊 罗洪恩 孙兆新 候旭 鹿晓林 马梦祺 于 2021-01-19 设计创作，主要内容包括：本发明公开了煤矿液压支架组合阀体装置,包括组合式液压阀体,传动轴逆时针旋转的时候,摆动件顺时逆转动,并通过驱动杆带动第一阀盘和第二阀盘分别向第一液压阀入口和第一液压阀出口侧移动,此时第一阀盘和第二阀盘分别与第一液压阀入口和第一液压阀出口闭合,于此同时,在连杆的带动下,第三阀盘和第四阀盘同时向内侧处移动,并且与第二液压阀入口和第二液压阀出口分离,实现了第二液压阀入口和第二液压阀出口通道的开启,以及第一液压阀入口和第一液压阀出口的闭合；本发明中,可实现管路切换过程顺畅、连贯,通过一次转动,实现两个管路的启闭,有效的降低了人工劳动强度,提高了管路切换效率,并且整个切换过程可实现无缝对接。(The invention discloses a combined valve body device of a coal mine hydraulic support, which comprises a combined hydraulic valve body, wherein when a transmission shaft rotates anticlockwise, a swinging piece rotates clockwise and anticlockwise, and drives a first valve disc and a second valve disc to move towards the inlet of a first hydraulic valve and the outlet of the first hydraulic valve respectively through a driving rod, at the moment, the first valve disc and the second valve disc are respectively closed with the inlet of the first hydraulic valve and the outlet of the first hydraulic valve, and meanwhile, under the driving of a connecting rod, the third valve disc and the fourth valve disc simultaneously move towards the inner side and are separated from the inlet of a second hydraulic valve and the outlet of the second hydraulic valve, so that the opening of a channel between the inlet of the second hydraulic valve and the outlet of the second hydraulic valve and the closing of the inlet of the first hydraulic valve; according to the invention, the pipeline switching process can be smooth and coherent, the opening and closing of the two pipelines are realized through one-time rotation, the manual labor intensity is effectively reduced, the pipeline switching efficiency is improved, and the seamless butt joint can be realized in the whole switching process.)

1. Colliery hydraulic support combination valve body device, its characterized in that: the hydraulic control valve comprises a mounting seat (1), a combined hydraulic valve body (2), a flange type connecting seat (3), a driving mechanism (4), a first hydraulic valve inlet (5), a first hydraulic valve outlet (6), a second hydraulic valve inlet (7) and a second hydraulic valve outlet (8), wherein the mounting seat (1) for mounting the combined hydraulic valve body (2) is fixedly mounted on one side of the combined hydraulic valve body (2); the flange type connecting seat (3) is fixedly arranged on one side, far away from the mounting seat (1), of the combined type hydraulic valve body (2) through bolts; the driving mechanism (4) is fixedly arranged at one end of the flange type connecting seat (3) far away from the combined type hydraulic valve body (2);

the inlet (5) of the first hydraulic valve is arranged at the top of the combined hydraulic valve body (2); the outlet (6) of the first hydraulic valve and the inlet (5) of the first hydraulic valve are symmetrically arranged and are positioned at the bottom of the combined hydraulic valve body (2);

the second hydraulic valve inlet (7) is arranged on the right side of the combined hydraulic valve body (2); the second hydraulic valve outlet (8) and the second hydraulic valve inlet (7) are symmetrically arranged and are positioned on the left side of the combined hydraulic valve body (2);

through holes convenient for the fixed installation of the mounting seat (1) are formed in the two sides of the mounting seat (1); the flange type connecting seat (3) is transversely provided with a through hole which is convenient for the transmission shaft (47) to penetrate through.

2. The coal mine hydraulic support combination valve body device as claimed in claim 1, wherein: the combined hydraulic valve body (2) comprises a valve shell (21), the valve shell (21) is in an octagon shape made of metal materials, and a first valve disc (25), a second valve disc (26), a third valve disc (27) and a fourth valve disc (28) are arranged inside the valve shell (21); the first valve disc (25), the second valve disc (26), the third valve disc (27) and the fourth valve disc (28) are respectively positioned at the inner sides of the first hydraulic valve inlet (5), the first hydraulic valve outlet (6), the second hydraulic valve inlet (7) and the second hydraulic valve outlet (8).

3. The coal mine hydraulic support combination valve body device as set forth in claim 2, wherein: the two ends of the first valve disc (25) and the second valve disc (26) are connected with the third valve disc (27) and the fourth valve disc (28) through connecting rods, and the connecting rods are movably connected with the first valve disc (25), the second valve disc (26), the third valve disc (27) and the fourth valve disc (28) through rotating shafts.

4. The coal mine hydraulic support combination valve body device as set forth in claim 3, wherein: a bearing (22) with a seat is arranged in the middle of the interior of the valve shell (21) and is convenient for connecting a transmission shaft (47); a swinging piece (23) is fixedly arranged outside the connecting end of the transmission shaft (47) and the bearing with the seat (22); two ends of the swinging piece (23) are respectively connected with a first valve disc (25) and a second valve disc (26) through a driving rod (24); the driving rod (24) is movably connected with the first valve disc (25) and the second valve disc (26) through rotating shafts.

5. The coal mine hydraulic support combination valve body device as set forth in claim 4, wherein: and one side of the upper end of the bearing with a seat (22) is fixedly provided with a limiting column (29) for limiting the rotation angle of the driving rod (24).

6. The coal mine hydraulic support combination valve body device as claimed in claim 1, wherein: first hydrovalve entry (5), first hydrovalve export (6), the inboard of second hydrovalve entry (7) and second hydrovalve export (8) has all been seted up and has been convenient for first valve disc (25) and second valve disc (26), third valve disc (27) and fourth valve disc (28) matched with seal groove.

7. The coal mine hydraulic support combination valve body device as claimed in claim 1, wherein: the driving mechanism (4) comprises two supporting columns (41), an outer shell (42) and an overhauling cover (43), wherein the two supporting columns (41) are arranged in parallel, one end of each supporting column (41) is fixedly welded with the flange type connecting seat (3), and the outer shell (42) is fixedly installed at the other end of each supporting column; one end of the outer shell (42) far away from the support column (41) is fixedly provided with an overhaul cover (43) through a screw; a sealing gasket is arranged between the outer shell (42) and the maintenance cover (43).

8. The coal mine hydraulic support combination valve body device as set forth in claim 7, wherein: an arc-shaped groove for a transmission shaft (47) to pass through is formed in one side, opposite to the two support columns (41); one side of the outer shell (42) close to the support column (41) is provided with a through groove which is convenient for the transmission shaft (47) to pass through.

9. The coal mine hydraulic support combination valve body device as set forth in claim 7, wherein: a bevel gear set (44) is arranged inside the outer shell (42); the bevel gear set (44) is respectively connected with a driving shaft (45) and a transmission shaft (47); the driving shaft (45) is rotatably connected with the outer shell (42) through a bearing, one end of the driving shaft (45) penetrates through the outer part of the outer shell (42), and the driving shaft (45) is arranged at the outer end of the outer shell (42) and is provided with a hand wheel (46) in a matched mode.

10. The coal mine hydraulic support combination valve body device as set forth in claim 9, wherein: one end of the transmission shaft (47) far away from the bevel gear set (44) penetrates through the outer shell (42), the support column (41), the flange type connecting seat (3) and the valve shell (21) and then is connected with the bearing (22) with the seat in a matched mode, and a bearing is arranged between the transmission shaft (47) and the outer shell (42).

Technical Field

The invention relates to the technical field of valve body equipment, in particular to a combined valve body device of a coal mine hydraulic support.

Background

The hydraulic support is a structure used for controlling the mine pressure of a coal face, the mine pressure of the coal face acts on the hydraulic support in an external load mode, and in a mechanical system in which the hydraulic support and surrounding rock of the coal face interact, if the resultant force of all supporting pieces of the hydraulic support and the resultant force of the external load of a top plate acting on the hydraulic support are exactly in the same straight line, the hydraulic support is very suitable for the surrounding rock of the coal face.

Colliery hydraulic support uses with hydraulic support combination valve cooperation usually, and when one set of hydraulic support equipment of current needs a plurality of combination valves, need control two combination valves and could reach the purpose that hydraulic pressure pipeline switched in hydraulic pressure switching-over, can not realize seamless butt joint moreover when switching, intensity of labour is big, and work efficiency is low.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a combined valve body device of a coal mine hydraulic support, which solves the problems that when one set of hydraulic support equipment needs a plurality of combined valves, two combined valves need to be operated to achieve the aim of hydraulic pipeline switching in hydraulic reversing, seamless butt joint cannot be realized in switching, the labor intensity is high, and the working efficiency is low.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: the combined valve body device of the coal mine hydraulic support comprises a mounting seat, a combined hydraulic valve body, a flange type connecting seat, a driving mechanism, a first hydraulic valve inlet, a first hydraulic valve outlet, a second hydraulic valve inlet and a second hydraulic valve outlet, wherein the mounting seat for mounting the combined hydraulic valve body is fixedly mounted on one side of the combined hydraulic valve body; the flange type connecting seat is fixedly arranged on one side of the combined type hydraulic valve body, which is far away from the mounting seat, through bolts; the driving mechanism is fixedly arranged at one end of the flange type connecting seat far away from the combined hydraulic valve body;

the inlet of the first hydraulic valve is arranged at the top of the combined hydraulic valve body; the outlet of the first hydraulic valve and the inlet of the first hydraulic valve are symmetrically arranged and are positioned at the bottom of the combined hydraulic valve body;

the inlet of the second hydraulic valve is arranged on the right side of the combined hydraulic valve body; the outlet of the second hydraulic valve and the inlet of the second hydraulic valve are symmetrically arranged and are positioned on the left side of the combined hydraulic valve body;

through holes convenient for the fixed installation of the mounting seat are formed in the two sides of the mounting seat; the flange type connecting seat is transversely provided with a through hole which is convenient for the transmission shaft to penetrate through.

As a further technical scheme of the invention, the combined hydraulic valve body comprises a valve shell, the shape of the valve shell is in an octagon shape made of metal materials, and a first valve disc, a second valve disc, a third valve disc and a fourth valve disc are arranged inside the valve shell; the first valve disc, the second valve disc, the third valve disc and the fourth valve disc are respectively positioned at the inner sides of the inlet of the first hydraulic valve, the outlet of the first hydraulic valve, the inlet of the second hydraulic valve and the outlet of the second hydraulic valve.

As a further technical scheme of the invention, two ends of the first valve disc and the second valve disc are connected with the third valve disc and the fourth valve disc through connecting rods, wherein the connecting rods are movably connected with the first valve disc, the second valve disc, the third valve disc and the fourth valve disc through rotating shafts.

As a further technical scheme of the invention, a bearing with a seat which is convenient for connecting a transmission shaft is arranged in the middle position in the valve shell; the outer part of the connecting end of the transmission shaft and the bearing with the seat is fixedly provided with a swinging piece; two ends of the swinging piece are respectively connected with the first valve disc and the second valve disc through the driving rod; the driving rod is movably connected with the first valve disc and the second valve disc through rotating shafts.

As a further technical scheme of the invention, one side of the upper end of the bearing with the seat is fixedly provided with a limit column for limiting the rotation angle of the driving rod.

As a further technical scheme of the invention, the inner sides of the inlet of the first hydraulic valve, the outlet of the first hydraulic valve, the inlet of the second hydraulic valve and the outlet of the second hydraulic valve are respectively provided with a sealing groove which is convenient for the first valve disc, the second valve disc and the third valve disc to be matched with the fourth valve disc.

As a further technical scheme of the invention, the driving mechanism comprises two supporting columns, an outer shell and an overhaul cover, wherein the two supporting columns are arranged in parallel, one end of each supporting column is welded and fixed with the flange type connecting seat, and the other end of each supporting column is fixedly provided with the outer shell; one end of the outer shell, which is far away from the strut, is fixedly provided with an overhaul cover through a screw; a sealing gasket is arranged between the outer shell and the maintenance cover.

As a further technical scheme of the invention, one side of each of the two support columns opposite to each other is provided with an arc-shaped groove for the transmission shaft to pass through conveniently; one side of the outer shell body, which is close to the support column, is provided with a through groove which is convenient for the transmission shaft to pass through.

As a further technical scheme of the invention, a bevel gear set is arranged inside the outer shell; the bevel gear set is respectively connected with the driving shaft and the transmission shaft; the drive shaft pass through bearing and shell body swivelling joint, and the outside of shell body is run through to the one end of drive shaft, this drive shaft is in the outside end cooperation of shell body and installs the hand wheel.

As a further technical scheme of the invention, one end of the transmission shaft, which is far away from the bevel gear set, penetrates through the outer shell, the support post, the flange type connecting seat and the valve shell and then is matched and connected with the bearing with the seat, and the bearing is arranged between the transmission shaft and the outer shell.

(III) advantageous effects

The invention provides a combined valve body device of a coal mine hydraulic support. The method has the following beneficial effects:

1. according to the invention, the inlet and the outlet of the first hydraulic valve are a group of hydraulic passages, the inlet and the outlet of the second hydraulic valve are another group of hydraulic passages, and the two groups of passages are integrated, so that two hydraulic pipelines can be controlled simultaneously, and the switching efficiency of the pipelines is effectively improved;

2. according to the invention, the driving mechanism is arranged, when the pipelines are switched, the hand wheel is rotated to drive the driving shaft to rotate, and the transmission shaft is driven to rotate under the coordination of the bevel gear set, so that the rotation of the swinging part is realized, and the switching of the pipelines of the combined hydraulic valve body is realized;

3. according to the invention, when the transmission shaft rotates clockwise, the swinging piece rotates clockwise, and drives the first valve disc and the second valve disc to move inwards through the driving rod, at the moment, the first valve disc and the second valve disc are separated from the inlet of the first hydraulic valve and the outlet of the first hydraulic valve respectively, and meanwhile, under the driving of the connecting rod, the third valve disc and the fourth valve disc move towards the inlet of the second hydraulic valve and the outlet of the second hydraulic valve respectively and are sealed, so that the closing of the channels of the inlet of the second hydraulic valve and the outlet of the second hydraulic valve and the opening of the inlet of the first hydraulic valve and the outlet of the first hydraulic valve are realized;

4. according to the invention, when the transmission shaft rotates anticlockwise under the condition that the second hydraulic valve inlet and the second hydraulic valve outlet are communicated, the swinging piece rotates clockwise and anticlockwise, and drives the first valve disc and the second valve disc to move towards the first hydraulic valve inlet and the first hydraulic valve outlet respectively through the driving rod, at the moment, the first valve disc and the second valve disc are respectively closed with the first hydraulic valve inlet and the first hydraulic valve outlet, and meanwhile, under the driving of the connecting rod, the third valve disc and the fourth valve disc simultaneously move towards the inner side and are separated from the second hydraulic valve inlet and the second hydraulic valve outlet, so that the opening of a channel of the second hydraulic valve inlet and the second hydraulic valve outlet and the closing of the first hydraulic valve inlet and the first hydraulic valve outlet are realized;

5. according to the invention, the arrangement of the limiting column can limit the rotation angle of the swinging piece, so that the situation that the first valve disc and the second valve disc cannot be closed with the inlet and the outlet of the first hydraulic valve due to excessive torsion of the swinging piece is prevented;

6. according to the invention, the pipeline switching process can be smooth and coherent, the opening and closing of the two pipelines are realized through one-time rotation, the manual labor intensity is effectively reduced, the pipeline switching efficiency is improved, and the seamless butt joint can be realized in the whole switching process.

Drawings

FIG. 1 is a schematic perspective view of a combined valve body device of a coal mine hydraulic support according to the present invention;

FIG. 2 is a bottom view of FIG. 1 of the coal mine hydraulic support combination valve body apparatus of the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 1 of the coal mine hydraulic support combination valve body apparatus of the present invention;

FIG. 4 is a schematic structural diagram of a combined valve body device of a coal mine hydraulic support according to the invention;

FIG. 5 is a sectional view taken along line A-A of FIG. 4 of the coal mine hydraulic support combination valve body assembly of the present invention;

fig. 6 is a sectional view B-B of fig. 4 in the combined valve body device of the coal mine hydraulic support of the invention.

In the figure: 1. a mounting seat; 2. a combined hydraulic valve body; 21. a valve housing; 22. a pedestal bearing; 23. a swinging member; 24. a drive rod; 25. a first valve disc; 26. a second valve disc; 27. a third valve disc; 28. a fourth valve disc; 29. a limiting column; 3. a flange type connecting seat; 4. a drive mechanism; 41. a pillar; 42. an outer housing; 43. an overhaul cover; 44. a bevel gear set; 45. a drive shaft; 46. a hand wheel; 47. a drive shaft; 5. a first hydraulic valve inlet; 6. a first hydraulic valve outlet; 7. a second hydraulic valve inlet; 8. and a second hydraulic valve outlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, the present invention provides the following technical solutions: the combined valve body device of the coal mine hydraulic support comprises a mounting seat 1, a combined hydraulic valve body 2, a flange type connecting seat 3, a driving mechanism 4, a first hydraulic valve inlet 5, a first hydraulic valve outlet 6, a second hydraulic valve inlet 7 and a second hydraulic valve outlet 8, wherein the mounting seat 1 for mounting the combined hydraulic valve body 2 is fixedly mounted on one side of the combined hydraulic valve body 2; the flange type connecting seat 3 is fixedly arranged on one side, far away from the mounting seat 1, of the combined type hydraulic valve body 2 through bolts; the driving mechanism 4 is fixedly arranged at one end of the flange type connecting seat 3 far away from the combined type hydraulic valve body 2;

the first hydraulic valve inlet 5 is arranged at the top of the combined hydraulic valve body 2; the first hydraulic valve outlet 6 and the first hydraulic valve inlet 5 are symmetrically arranged and are positioned at the bottom of the combined hydraulic valve body 2;

the second hydraulic valve inlet 7 is arranged on the right side of the combined hydraulic valve body 2; the second hydraulic valve outlet 8 and the second hydraulic valve inlet 7 are symmetrically arranged and are positioned on the left side of the combined hydraulic valve body 2;

through holes convenient for the fixed installation of the installation base 1 are formed in the two sides of the installation base 1; the flange type connecting seat 3 is transversely provided with a through hole which is convenient for the transmission shaft 47 to penetrate through.

In this embodiment, the combined hydraulic valve body 2 includes a valve housing 21, the shape of the valve housing 21 is an octagonal shape made of metal, and a first valve disc 25, a second valve disc 26, a third valve disc 27 and a fourth valve disc 28 are arranged inside the valve housing 21; the first valve disc 25, the second valve disc 26, the third valve disc 27 and the fourth valve disc 28 are located inside the first hydraulic valve inlet 5, the first hydraulic valve outlet 6, the second hydraulic valve inlet 7 and the second hydraulic valve outlet 8, respectively.

In this embodiment, both ends of the first valve disc 25 and the second valve disc 26 are connected to the third valve disc 27 and the fourth valve disc 28 through connecting rods, wherein the connecting rods are movably connected to the first valve disc 25, the second valve disc 26, the third valve disc 27 and the fourth valve disc 28 through rotating shafts.

In this embodiment, the middle position inside the valve housing 21 is further provided with a bearing with a seat 22 for facilitating the connection of the transmission shaft 47; the swinging piece 23 is fixedly arranged outside the connecting end of the transmission shaft 47 and the bearing with a seat 22; the two ends of the swinging piece 23 are respectively connected with a first valve disc 25 and a second valve disc 26 through a driving rod 24; the driving rod 24 is movably connected with the first valve disc 25 and the second valve disc 26 through rotating shafts.

In this embodiment, a limiting column 29 for limiting the rotation angle of the driving rod 24 is fixedly installed on one side of the upper end of the bearing with bearing seat 22.

In this embodiment, the first hydrovalve entry 5, first hydrovalve export 6, the inboard of second hydrovalve entry 7 and second hydrovalve export 8 all seted up the first valve disc 25 and the second valve disc 26 of being convenient for, third valve disc 27 and fourth valve disc 28 matched with seal groove.

In this embodiment, the driving mechanism 4 includes two support columns 41, an outer casing 42 and an inspection cover 43, the two support columns 41 are arranged in parallel, one end of each support column 41 is welded and fixed with the flange type connecting seat 3, and the other end of each support column 41 is fixedly provided with the outer casing 42; one end of the outer shell 42 far away from the strut 41 is fixedly provided with an overhaul cover 43 through a screw; a sealing gasket is arranged between the outer shell 42 and the maintenance cover 43.

In this embodiment, the two opposite sides of the support posts 41 are provided with arc-shaped grooves for the transmission shaft 47 to pass through; one side of the outer shell 42 close to the pillar 41 is provided with a through groove for the transmission shaft 47 to pass through.

In the present embodiment, a bevel gear set 44 is disposed inside the outer casing 42; the bevel gear set 44 is respectively connected with a driving shaft 45 and a transmission shaft 47; the driving shaft 45 is rotatably connected with the outer shell 42 through a bearing, one end of the driving shaft 45 penetrates through the outer part of the outer shell 42, and a hand wheel 46 is installed at the outer end of the driving shaft 45, which is positioned at the outer part of the outer shell 42, in a matching manner.

In this embodiment, the end of the transmission shaft 47 far from the bevel gear set 44 penetrates through the outer housing 42, the pillar 41, the flange type connecting seat 3 and the valve housing 21 and then is connected with the bearing 22 with the seat in a matching manner, and a bearing is arranged between the transmission shaft 47 and the outer housing 42.

Principle of operation

When the pipeline is switched, the rotating hand wheel 46 drives the driving shaft 45 to rotate, the transmission shaft 47 is driven to rotate under the coordination of the bevel gear set 44, thereby realizing the rotation of the swinging component 23, realizing the switching of the pipelines of the combined hydraulic valve body 2, when the transmission shaft 47 rotates clockwise, the oscillating member 23 rotates clockwise, and drives the first valve disc 25 and the second valve disc 26 to move inward through the driving rod 24, at this time, the first valve disc 25 and the second valve disc 26 are separated from the first hydraulic valve inlet 5 and the first hydraulic valve outlet 6, respectively, and at the same time, driven by the connecting rod, the third valve disc 27 and the fourth valve disc 28 move to the second hydraulic valve inlet 7 and the second hydraulic valve outlet 8 respectively, and sealing, the closing of the channels of the second hydraulic valve inlet 7 and the second hydraulic valve outlet 8 and the opening of the first hydraulic valve inlet 5 and the first hydraulic valve outlet 6 are realized;

when the transmission shaft 47 rotates counterclockwise in a state that the second hydraulic valve inlet 7 and the second hydraulic valve outlet 8 are communicated, the oscillating member 23 rotates clockwise and counterclockwise, and drives the first valve disc 25 and the second valve disc 26 to move to the first hydraulic valve inlet 5 and the first hydraulic valve outlet 6 respectively through the driving rod 24, at this time, the first valve disc 25 and the second valve disc 26 are closed with the first hydraulic valve inlet 5 and the first hydraulic valve outlet 6 respectively, and at the same time, under the driving of the connecting rod, the third valve disc 27 and the fourth valve disc 28 simultaneously move to the inner side and are separated from the second hydraulic valve inlet 7 and the second hydraulic valve outlet 8, so that the opening of channels of the second hydraulic valve inlet 7 and the second hydraulic valve outlet 8 and the closing of the first hydraulic valve inlet 5 and the first hydraulic valve outlet 6 are realized; the arrangement of the limiting column 29 can limit the rotation angle of the oscillating piece 23, and prevent the situation that the first valve disc 25 and the second valve disc 26 cannot be closed with the first hydraulic valve inlet 5 and the first hydraulic valve outlet 6 due to the fact that the oscillating piece 23 is excessively twisted; according to the invention, the pipeline switching process can be smooth and coherent, the opening and closing of the two pipelines are realized through one-time rotation, the manual labor intensity is effectively reduced, the pipeline switching efficiency is improved, and the seamless butt joint can be realized in the whole switching process.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.