1. The utility model provides a main shaft intensity detection device for digit control machine tool, includes workstation (1), its characterized in that: the upper surface of the workbench (1) is provided with a strength detection mechanism (2), an auxiliary supporting mechanism (3) and a bearing mechanism (4), the lower surface of the workbench (1) is provided with a transportation mechanism (5), and the upper surface of the bearing mechanism (4) is provided with a lifting mechanism (6);

the auxiliary supporting mechanism (3) comprises a bottom plate (31), a guide block (32) is fixedly connected to the lower surface of the bottom plate (31), a bidirectional electric screw rod (33) inserted into the bottom plate (31) is fixedly installed on the front surface of the bottom plate (31), two bidirectional nuts (34) are connected to the bidirectional electric screw rod (33) in an external thread connection mode, linkage rods (35) are rotatably connected to the upper surfaces of the bidirectional nuts (34), and the upper surfaces of the two linkage rods (35) are rotatably connected with a supporting plate (36);

hoisting mechanism (6) include coiling motor (61), rolling dish (62) and play gallows (65), rolling dish (62) periphery wall fixedly connected with stay cord (63), one end fixedly connected with lifting hook (64) of rolling dish (62) are kept away from in stay cord (63), play fixed surface is connected with link (66) on gallows (65), swing joint has butt joint rope (67) between link (66) and lifting hook (64).

2. The spindle strength detecting device for the numerical control machine tool according to claim 1, characterized in that: intensity detection mechanism (2) include host computer head (21), activity head (22), the electronic slip table of third (23) and control terminal (24), host computer head (21) and the equal fixed mounting in workstation (1) upper surface of control terminal (24), the electronic slip table of third (23) fixed mounting is in workstation (1), just the electronic slip table of third (23) is located host computer head (21) left side.

3. The spindle strength detecting device for the numerical control machine tool according to claim 2, characterized in that: the slider upper surface and the first (22) lower fixed surface that moves about of third electronic slip table (23) are connected, supplementary supporting mechanism (3) are located between host computer head (21) and the head (22) that moves about, guide block (32) are pegged graft to workstation (1) in, two the moving direction of two-way nut (34) is opposite.

4. The spindle strength detecting device for the numerical control machine tool according to claim 1, characterized in that: the upper surface of the bottom plate (31) is provided with a strip-shaped groove matched with the size of the linkage rod (35), the upper surface of the support plate (36) is fixedly provided with a pressure sensing plate, and the pressure sensing plate is electrically connected with the bidirectional electric screw rod (33).

5. The spindle strength detecting device for the numerical control machine tool according to claim 1, characterized in that: bearing mechanism (4) include first grudging post (41) and second grudging post (42), the equal fixed mounting in workstation (1) upper surface of first grudging post (41) and second grudging post (42), intensity detection mechanism (2) are located between first grudging post (41) and second grudging post (42), fixed mounting has first electronic slip table (43) in first grudging post (41).

6. The spindle strength detecting device for the numerical control machine tool according to claim 5, characterized in that: the upper surface sliding connection of first grudging post (41) has first layer board (44), the slider and first layer board (44) fixed connection of first electronic slip table (43), fixed mounting has electronic slip table of second (45) in second grudging post (42), upper surface sliding connection has second layer board (46) on second grudging post (42).

7. The spindle strength detecting device for the numerical control machine tool according to claim 6, characterized in that: the slider and the second layer board (46) fixed connection of electronic slip table of second (45), equal fixed mounting of first layer board (44) and second layer board (46) upper surface has rolling motor (61) and rolling dish (62), the output shaft of rolling motor (61) and the pivot fixed connection of rolling dish (62).

8. The spindle strength detecting device for the numerical control machine tool according to claim 1, characterized in that: the anti-skidding type transport mechanism is characterized in that an arc-shaped groove is formed in the upper surface of the lifting frame (65), an anti-skidding sponge cushion is fixedly connected to the inner peripheral wall of the arc-shaped groove, the transport mechanism (5) comprises a frame body (51), the four moving wheels (52) are fixedly mounted on the lower surface of the frame body (51), and the two clamping seats (53) are slidably connected to the upper surface of the frame body (51).

9. The spindle strength detecting device for the numerical control machine tool according to claim 8, characterized in that: the front surface of the clamping seat (53) is in threaded connection with a positioning screw (54), the clamping seat (53) is fixedly connected with two limiting pins (55), the lower surface of the lifting frame (65) is provided with a slot matched with the limiting pins (55), and the peripheral wall of the frame body (51) is rotatably connected with a telescopic hand lever (56).

10. A spindle strength detection method for a numerical control machine tool is characterized by comprising the following steps:

1) firstly, mounting lifting frames (65) on clamping seats (53), positioning through limiting pins (55), then adjusting the distance between the two clamping seats (53) according to the length of a main shaft to be detected, then positioning through positioning screws (54), moving the main shaft to be detected to the two lifting frames (65), and then driving the main shaft to be detected to move to the bottom of a workbench (1) through pushing a frame body (51);

2) firstly, adjusting the distance between two winding motors (61) according to the length of a main shaft to be detected, then controlling the output shafts of the winding motors (61) to rotate to lower a lifting hook (64) to be close to a lifting frame (65), then connecting a hanging ring (66) with the lifting hook (64) through a butt-joint rope (67), further controlling the output shafts of the winding motors (61) to rotate reversely to drive a pull rope (63) to rewind, lifting the main shaft to be detected between a main machine head (21) and a movable head (22), fixing one end of the main shaft with the main machine head (21), then moving the movable head (22) to be tightly attached to the other end of the main shaft and be fixed with the main machine head, and after the fixing is completed, controlling the output shafts of the winding motors (61) to rotate to lower the lifting hook (64) by a small distance;

3) starting a main machine head (21) to carry out strength detection, firstly carrying out loading detection from an initial load, keeping for a period of time after the initial load is reached, observing whether damage occurs, increasing the load by a fixed numerical value if no damage trace exists, and repeating the operation until the damage occurs to obtain a strength value;

4) after the main shaft is broken and damaged, the auxiliary supporting mechanism (3) is moved to the position below one section after the main shaft is broken, then the bidirectional electric screw (33) is controlled to drive the supporting plate (36) to ascend until the supporting plate is contacted with the bottom of the main shaft, the positions of the two winding motors (61) are adjusted, the two lifting frames (65) are moved to the position below the other section, then the section is separated from the strength detection mechanism (2), the winding motors (61) are used for placing the section back to the frame body (51), and after the section is placed, the operation is repeated to place the other section.

Background

The strength is one of mechanical properties of the engineering material for resisting fracture and excessive deformation, common strength performance indexes comprise tensile strength and yield strength (or yield point), cast iron and inorganic materials have no yield phenomenon, so that the strength performance is measured by only using the tensile strength, the high polymer material also adopts the tensile strength, the strength performance of the material is expressed by the bending strength, the compressive strength and the shear strength of the material when the high polymer material bears bending load, compressive load or torsional load, and a spindle of a numerical control machine tool refers to a shaft which drives a workpiece or a cutter to rotate on the machine tool.

In practical applications, shaft parts are often required to have high comprehensive properties such as strength, toughness, surface hardness and wear resistance, and the strength of a main shaft must be measured in order to ensure normal use of the parts and safe operation of a machine.

Present main shaft intensity detection device needs the manual work to carry the main shaft, and the main shaft is generally heavier, leads to the handling inefficiency, and simultaneously after the main shaft fracture of detection, both ends are fixed to become one end fixed, and the manual work takes off it from the top needs a period of time, and the action of gravity of main shaft can cause the damage to the fixed point this moment, influences follow-up detection.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the spindle strength detection device for the numerical control machine tool and the method thereof, which have the advantages of convenience in carrying and use and solve the problems of inconvenience in carrying and use.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a main shaft intensity detection device for digit control machine tool, includes the workstation, the workstation upper surface is equipped with intensity detection mechanism, supplementary supporting mechanism and bearing mechanism, the workstation lower surface is equipped with transport mechanism, bearing mechanism upper surface is equipped with lifts by crane the mechanism.

The auxiliary supporting mechanism comprises a bottom plate, a guide block is fixedly connected to the lower surface of the bottom plate, a bidirectional electric screw rod which is inserted into the bottom plate is fixedly mounted on the front surface of the bottom plate, the bidirectional electric screw rod is externally connected with two bidirectional nuts in number, the upper surface of each bidirectional nut is rotatably connected with a linkage rod, and the upper surfaces of the linkage rods are rotatably connected with a supporting plate.

The lifting mechanism comprises a winding motor, a winding disc and a lifting frame, a pull rope is fixedly connected to the outer peripheral wall of the winding disc, one end of the pull rope, far away from the winding disc, is fixedly connected with a lifting hook, the upper surface of the lifting frame is fixedly connected with a hanging ring, and a butt-joint rope is movably connected between the hanging ring and the lifting hook.

Further, intensity detection mechanism includes host computer head, activity head, the electronic slip table of third and control terminal, the equal fixed mounting of host computer head and control terminal is in the workstation upper surface, the electronic slip table fixed mounting of third is in the workstation, just the electronic slip table of third is located host computer head left side.

Further, the slider upper surface and the first lower fixed surface of activity of electronic slip table of third are connected, supplementary supporting mechanism is located between host computer head and the activity head, the guide block is pegged graft to the workstation in, two the moving direction of two-way nut is opposite.

Further, the strip-shaped groove matched with the size of the linkage rod is formed in the upper surface of the bottom plate, a pressure sensing plate is fixedly mounted on the upper surface of the supporting plate, and the pressure sensing plate is electrically connected with the bidirectional electric screw rod.

Further, bearing mechanism includes first grudging post and second grudging post, the equal fixed mounting of first grudging post and second grudging post in workstation upper surface, intensity detection mechanism is located between first grudging post and the second grudging post, fixed mounting has first electronic slip table in the first grudging post.

Further, first grudging post upper surface sliding connection has first layer board, the slider and the first layer board fixed connection of first electronic slip table, fixed mounting has the electronic slip table of second in the second grudging post, second grudging post upper surface sliding connection has the second layer board.

Further, the slider and the second layer board fixed connection of electronic slip table of second, first layer board and second layer board upper surface all fixed mounting have rolling motor and rolling dish, rolling motor's output shaft and rolling dish's pivot fixed connection.

Further, the arc-shaped groove has been seted up to the gallows upper surface, the internal perisporium fixedly connected with antiskid foam-rubber cushion of arc-shaped groove, transport mechanism includes the framework, fixed surface installs the removal wheel that quantity is four under the framework, framework upper surface sliding connection has the cassette that quantity is two.

Furthermore, the front surface of the clamping seat is in threaded connection with a positioning screw, the upper surface of the clamping seat is fixedly connected with two limiting pins, the lower surface of the lifting frame is provided with a slot matched with the limiting pins, and the peripheral wall of the frame body is rotatably connected with a telescopic hand lever.

A spindle strength detection method for a numerical control machine tool comprises the following steps:

1) firstly, mounting lifting frames on clamping seats, positioning through limiting pins, adjusting the distance between the two clamping seats according to the length of a main shaft to be detected, positioning through positioning screws, moving the main shaft to be detected to the two lifting frames, and driving the main shaft to be detected to move to the bottom of a workbench by pushing a frame body;

2) firstly, adjusting the distance between two winding motors according to the length of a main shaft to be detected, then controlling the output shafts of the winding motors to rotate to lower a lifting hook to be close to a lifting frame, then connecting a hanging ring with the lifting hook through a butt joint rope, further controlling the output shafts of the winding motors to rotate reversely to drive a pull rope to rewind, lifting the main shaft to be detected to be between a main machine head and a movable head, firstly fixing one end of the main shaft and the main machine head, then moving the movable head to be tightly attached to the other end of the main shaft and be fixed with the main shaft, and after the fixing is finished, controlling the output shafts of the winding motors to rotate to lower the lifting hook for a small distance;

3) starting the main machine head to carry out strength detection, firstly carrying out loading detection from an initial load, keeping for a period of time after the initial load is reached, observing whether damage occurs, if no damage trace exists, increasing the load by a fixed numerical value, and repeating the operation until the damage occurs, so as to obtain a strength value;

4) when the main shaft is broken and damaged, the auxiliary supporting mechanism is moved to the position below one section after the main shaft is broken, then the bidirectional electric screw rod is controlled to drive the supporting plate to ascend until the supporting plate is contacted with the bottom of the main shaft, the positions of the two winding motors are adjusted again, the two lifting frames are moved to the position below the other section, then the section can be separated from the strength detection mechanism, the winding motors are used for placing the section back to the frame body, and after the section is placed, the operation is repeated to place the other section.

Compared with the prior art, the technical scheme of the application has the following beneficial effects:

1. according to the spindle strength detection device and method for the numerical control machine tool, the spindle is moved and transported by arranging the transportation mechanism, the spindle transported to the lower side of the workbench is lifted by arranging the lifting mechanism, the distance of manual carrying in the whole feeding and discharging process is reduced, meanwhile, the lifting frame is applied to the transportation mechanism and the lifting mechanism, the movement stability in the transportation lifting process can be ensured, the overall cost is reduced, the transit time from the transportation mechanism to the lifting mechanism is shortened, and the detection efficiency is improved.

2. According to the spindle strength detection device and method for the numerical control machine tool, the auxiliary supporting mechanism is arranged, so that one section of spindle can be supported after the spindle is broken, damage of an unsupported spindle to the strength detection mechanism in the blanking process of the other section of spindle is avoided, and the purpose of convenience in use is achieved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural diagram of the strength detection mechanism of the present invention;

FIG. 3 is a schematic structural diagram of an auxiliary supporting mechanism according to the present invention;

FIG. 4 is a schematic view of the construction of the support mechanism of the present invention;

FIG. 5 is a schematic structural view of the transport mechanism of the present invention;

FIG. 6 is a schematic structural diagram of a hoisting mechanism according to the present invention;

fig. 7 is a schematic structural view of the lifting frame of the present invention.

In the figure: 1 workbench, 2 strength detection mechanisms, 21 main machine head, 22 movable head, 23 third electric sliding table, 24 control terminal, 3 auxiliary supporting mechanisms, 31 bottom plate, 32 guide block, 33 bidirectional electric screw rod, 34 bidirectional nut, 35 linkage rod, 36 supporting plate, 4 bearing mechanism, 41 first vertical frame, 42 second vertical frame, 43 first electric sliding table, 44 first supporting plate, 45 second electric sliding table, 46 second supporting plate, 5 transport mechanism, 51 frame body, 52 moving wheel, 53 clamping seat, 54 positioning screw, 55 spacing pin, 56 telescopic hand lever, 6 hoisting mechanism, 61 winding motor, 62 winding disc, 63 pulling rope, 64 lifting hook, 65 hoisting frame, 66 hanging ring and 67 butt joint rope.

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, the spindle strength detecting device for a numerical control machine tool in the present embodiment includes a workbench 1, a strength detecting mechanism 2, an auxiliary supporting mechanism 3, and a supporting mechanism 4 are disposed on an upper surface of the workbench 1, a transporting mechanism 5 is disposed on a lower surface of the workbench 1, and a lifting mechanism 6 is disposed on an upper surface of the supporting mechanism 4.

Referring to fig. 1 and 2, the strength detection mechanism 2 includes a main machine head 21, a movable head 22, a third electric sliding table 23 and a control terminal 24, the main machine head 21 and the control terminal 24 are both fixedly mounted on the upper surface of the workbench 1, the third electric sliding table 23 is fixedly mounted in the workbench 1, the third electric sliding table 23 is located on the left side of the main machine head 21, the upper surface of a sliding block of the third electric sliding table 23 is fixedly connected with the lower surface of the movable head 22, the working strength of the main machine head 21 is controlled by the control terminal 24 and used for reading detected numbers, and the main machine head 21 is matched with the movable head 22 to fixedly clamp the main shaft and detect the main shaft.

Referring to fig. 1 and 3, the auxiliary supporting mechanism 3 includes a bottom plate 31, the auxiliary supporting mechanism 3 is located between the main head 21 and the movable head 22, a guide block 32 is fixedly connected to a lower surface of the bottom plate 31, the guide block 32 is inserted into the workbench 1, a bidirectional electric screw 33 inserted into the bottom plate 31 is fixedly installed on a front surface of the bottom plate 31, the bidirectional electric screw 33 is externally threaded with two bidirectional nuts 34, moving directions of the two bidirectional nuts 34 are opposite, an upper surface of the bidirectional nut 34 is rotatably connected with a linkage rod 35, upper surfaces of the two linkage rods 35 are rotatably connected with a supporting plate 36, an output shaft of the bidirectional electric screw 33 rotates to drive the two bidirectional nuts 34 to move in opposite directions, and the linkage rod 35 is pushed or pulled to drive the supporting plate 36 to move up or down.

Referring to fig. 1 and 4, the supporting mechanism 4 includes a first vertical frame 41 and a second vertical frame 42, the first vertical frame 41 and the second vertical frame 42 are both fixedly mounted on the upper surface of the workbench 1, the strength detection mechanism 2 is located between the first vertical frame 41 and the second vertical frame 42, a first electric sliding table 43 is fixedly mounted in the first vertical frame 41, the upper surface of the first vertical frame 41 is slidably connected with a first supporting plate 44, a sliding block of the first electric sliding table 43 is fixedly connected with the first supporting plate 44, a second electric sliding table 45 is fixedly mounted in the second vertical frame 42, the upper surface of the second vertical frame 42 is slidably connected with a second supporting plate 46, a sliding block of the second electric sliding table 45 is fixedly connected with the second supporting plate 46, the first supporting plate 44 is driven to move left and right by the first electric sliding table 43, and the second supporting plate 46 is driven to move left and right by the second electric sliding table 45.

Referring to fig. 1 and 5, the transportation mechanism 5 includes a frame 51, four moving wheels 52 are fixedly mounted on a lower surface of the frame 51, two clamping seats 53 are slidably connected to an upper surface of the frame 51, a positioning screw 54 is threadedly connected to a front surface of each clamping seat 53, two limiting pins 55 are fixedly connected to an upper surface of each clamping seat 53, slots matched with the limiting pins 55 are formed in a lower surface of the lifting frame 65, a retractable hand lever 56 is rotatably connected to an outer peripheral wall of the frame 51, the frame 51 can be pushed to move by the retractable hand lever 56 and the moving wheels 52, and the clamping seats 53 can be loosened or fixed by rotating the positioning screw 54.

Please refer to fig. 1, fig. 6 and fig. 7, the hoisting mechanism 6 includes a winding motor 61, a winding disc 62 and a lifting frame 65, an output shaft of the winding motor 61 is fixedly connected with a rotating shaft of the winding disc 62, a pull rope 63 is fixedly connected to the outer peripheral wall of the winding disc 62, one end of the pull rope 63 far away from the winding disc 62 is fixedly connected with a lifting hook 64, an arc-shaped groove is formed in the upper surface of the lifting frame 65, an anti-slip sponge cushion is fixedly connected to the inner peripheral wall of the arc-shaped groove, a hanging ring 66 is fixedly connected to the upper surface of the lifting frame 65, a butt-joint rope 67 is movably connected between the hanging ring 66 and the lifting hook 64, the winding disc 62 is driven to rotate by the output shaft of the winding motor 61, and then the pull rope 63 can be driven to wind or release, the spindle is supported by the lifting frame 65, and the spindle is prevented from sliding in the moving process.

A spindle strength detection method for a numerical control machine tool comprises the following steps:

1) firstly, mounting lifting frames 65 on the clamping seats 53, positioning the lifting frames through limiting pins 55, then adjusting the distance between the two clamping seats 53 according to the length of a main shaft to be detected, then positioning the main shaft to be detected by using positioning screws 54, moving the main shaft to be detected onto the two lifting frames 65, and then driving the main shaft to be detected to move to the bottom of the workbench 1 by pushing the frame body 51;

2) firstly, adjusting the distance between two winding motors 61 according to the length of a main shaft to be detected, then controlling the output shafts of the winding motors 61 to rotate to lower a lifting hook 64 to be close to a lifting frame 65, then connecting a hanging ring 66 with the lifting hook 64 through a butt-joint rope 67, further controlling the output shafts of the winding motors 61 to rotate reversely to drive a pull rope 63 to rewind, lifting the main shaft to be detected between a main machine head 21 and a movable head 22, fixing one end of the main shaft and the main machine head 21, then moving the movable head 22 to be tightly attached to the other end of the main shaft and fixing the movable head, and after the fixing is finished, controlling the output shafts of the winding motors 61 to rotate to lower the lifting hook 64 for a small distance;

3) starting the main machine head 21 to carry out strength detection, firstly carrying out loading detection from an initial load, keeping for a period of time after the initial load is reached, observing whether damage occurs, if no damage trace exists, increasing the load by a fixed numerical value, and repeating the operation until the damage occurs, so as to obtain a strength value;

4) after the main shaft is broken and damaged, the auxiliary supporting mechanism 3 is moved to the position below one section after the main shaft is broken, then the bidirectional electric screw 33 is controlled to drive the supporting plate 36 to ascend until the supporting plate contacts with the bottom of the main shaft, the positions of the two winding motors 61 are adjusted, the two lifting frames 65 are moved to the position below the other section, then the section can be separated from the strength detection mechanism 2, the winding motors 61 are used for placing the section back onto the frame body 51, and after the section is placed, the operation is repeated to place the other section.

It should be noted that a strip-shaped groove matched with the linkage rod 35 in size is formed in the upper surface of the bottom plate 31, and the winding motor 61 and the winding disc 62 are fixedly mounted on the upper surfaces of the first supporting plate 44 and the second supporting plate 46.

Referring to fig. 3, in order to facilitate the supporting plate 36 to determine whether to contact with the spindle, a pressure sensing plate is fixedly mounted on the upper surface of the supporting plate 36 in the present embodiment, and the pressure sensing plate is electrically connected to the bidirectional electric screw 33.

The working principle of the above embodiment is as follows:

1) firstly, mounting lifting frames 65 on the clamping seats 53, positioning the lifting frames through limiting pins 55, then adjusting the distance between the two clamping seats 53 according to the length of a main shaft to be detected, then positioning the main shaft to be detected by using positioning screws 54, moving the main shaft to be detected onto the two lifting frames 65, and then driving the main shaft to be detected to move to the bottom of the workbench 1 by pushing the frame body 51;

2) firstly, adjusting the distance between two winding motors 61 according to the length of a main shaft to be detected, then controlling the output shafts of the winding motors 61 to rotate to lower a lifting hook 64 to be close to a lifting frame 65, then connecting a hanging ring 66 with the lifting hook 64 through a butt-joint rope 67, further controlling the output shafts of the winding motors 61 to rotate reversely to drive a pull rope 63 to rewind, lifting the main shaft to be detected between a main machine head 21 and a movable head 22, fixing one end of the main shaft and the main machine head 21, then moving the movable head 22 to be tightly attached to the other end of the main shaft and fixing the movable head, and after the fixing is finished, controlling the output shafts of the winding motors 61 to rotate to lower the lifting hook 64 for a small distance;

3) starting the main machine head 21 to carry out strength detection, firstly carrying out loading detection from an initial load, keeping for a period of time after the initial load is reached, observing whether damage occurs, if no damage trace exists, increasing the load by a fixed numerical value, and repeating the operation until the damage occurs, so as to obtain a strength value;

4) after the main shaft is broken and damaged, the auxiliary supporting mechanism 3 is moved to the position below one section after the main shaft is broken, then the bidirectional electric screw 33 is controlled to drive the supporting plate 36 to ascend until the supporting plate contacts with the bottom of the main shaft, the positions of the two winding motors 61 are adjusted, the two lifting frames 65 are moved to the position below the other section, then the section can be separated from the strength detection mechanism 2, the winding motors 61 are used for placing the section back onto the frame body 51, and after the section is placed, the operation is repeated to place the other section.

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, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a 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.