1. The utility model provides a super magnetic separation water purification system with quick separation function which characterized in that includes the following step:

the method comprises the following steps: the wastewater enters a coagulation tank in a coagulation system after being settled in a pre-settling tank, a flocculating agent and magnetic seeds are added into the coagulation tank to flocculate and aggregate impurities in the wastewater, and the pre-settled impurities enter a sludge tank;

step two: the flocculated wastewater enters a super-magnetic separator, flocculated impurities and water are separated under the magnetic action of a magnetic field, and the separated water is discharged outwards;

step three: the impurities after magnetic separation enter a magnetic seed recovery machine to recover the magnetic seeds and flow back to a coagulation tank, the rest impurities enter a sludge transfer tank and enter a sludge tank from the sludge transfer tank, and finally the impurities in the sludge tank enter a filter press to be filtered and then are discharged outwards.

2. The system of claim 1, wherein the flocculating agent in the first step is PAC and PAM.

3. The ultra-magnetic separation water purification system with rapid separation function as claimed in claim 1, wherein the filter press in step three is a chamber filter press.

4. A water purifying apparatus, characterized in that the water purifying apparatus is a chamber filter press used in the ultra-magnetic separation water purifying system with a rapid separation function as claimed in claim 3, the chamber filter press comprising a base (1), a top frame (5) installed at the upper part thereof, and a bottom frame (2) installed at the lower part thereof.

5. A water purifying device according to claim 4, characterized in that a plurality of filter plates (6) are slidably mounted inside the top frame (5), the side edges of the upper end and the lower end of one side of each filter plate (6) are provided with insertion holes (7), the side edges of the upper end and the lower end of the other side of each filter plate are connected with insertion rods (12) correspondingly inserted into the insertion holes (7), a second start-stop switch is mounted inside any one insertion hole (7) on the same filter plate (6), and toggle boxes (4) for toggling the filter plates (6) are slidably mounted on the two sides of the top frame (5).

6. The water purifying apparatus according to claim 5, wherein an L-shaped top plate (8) is connected to the top of one side of the top of the filter plate (6) facing the insertion rod (12), the horizontal end of the top plate (8) is at the top, a movable plate (11) capable of sliding up and down is installed on the side of the filter plate (6) below the top plate (8), a pull rope (10) is connected to the top of the movable plate (11), a storage shaft (9) is rotatably installed below the horizontal end of the top plate (8), the top end of the pull rope (10) is wound outside the storage shaft (9), one end of the storage shaft (9) is connected with an output shaft of a driving motor inside the movable plate (11), and the second start-stop switch is used for controlling the start and stop of the driving motor.

7. The water purifying apparatus according to claim 6, wherein two ends of one side of the moving plate (11) facing the filter plate (6) are both connected with a support rod (13), one end of the support rod (13) far away from the moving plate (11) is provided with a ball (14), two sides of the filter plate (6) are both provided with a sliding groove for mounting the support rod (13) along a vertical direction, the length of the moving plate (11) is smaller than the distance between two inserted rods (12) at the same end, two sides of the moving plate (11) are both provided with loading cavities (17), a plurality of downward-inclined nozzles (16) are mounted inside the loading cavities (17), one end of the moving plate (11) is provided with an air pump (15), and an air outlet end of the air pump (15) is connected with the nozzles (16) through a pipeline.

8. The water purifying device according to any one of claims 4 to 7, wherein a receiving plate (21) is rotatably mounted inside the bottom frame (2), a discharge end is arranged on one side of the bottom frame (2), a push plate (23) for pushing impurities is slidably mounted on one side of the top of the receiving plate (21) away from the discharge end, sliding grooves (22) are formed in both ends of the top of the receiving plate (21), a shielding pad (24) made of elastic material is mounted above the inside of the sliding grooves (22), and both ends of the bottom of the push plate (23) are slidably mounted with the sliding grooves (22) through electric sliding blocks.

9. The water purifying apparatus according to claim 8, wherein both ends of the receiving plate (21) are rotatably mounted with both ends of the inside of the bottom frame (2) through a rotating rod (27), the end of the rotating rod (27) at one end is connected with an output shaft of a driving motor inside the bottom frame (2), a first start-stop switch (26) for controlling the electric slider is mounted at one end of the inside of the bottom frame (2), the receiving plate (21) can be pressed on the first start-stop switch (26) during rotation, and a rubber pad (25) is connected between the periphery of the receiving plate (21) and the inner wall of the bottom frame (2).

10. The water purifying device according to claim 8, wherein a plurality of cutting ropes (3) are installed above the bottom frame (2) along the length direction, both ends of the cutting ropes (3) are connected with moving seats (18), the moving seats (18) are slidably installed on one side of a vertical plate (20), the bottom of the vertical plate (20) is connected with the top of the bottom frame (2) for installation, a limiting groove is vertically arranged on the installation side of the vertical plate (20) and the moving seats (18), the moving seats (18) are slidably installed inside the limiting groove, and a return spring (19) is installed between the bottom of the moving seats (18) and the bottom end of the inside of the limiting groove.

Background

With the increase of cases of water pollution and the protection of water environment, sewage treatment is more and more emphasized. A wide variety of water treatment devices are available on the market. Some existing water treatment equipment are large in size and inconvenient to carry, and can only be fixed at a certain position to work. The existing water treatment equipment is simply adopted for mine water treatment, and the water treatment equipment is difficult to normally move in a mine due to limited space. Adversely affecting the efficiency of subsequent water purification and the shifting of the location of the plant.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a super-magnetic separation water purification system with a quick separation function and equipment.

The purpose of the invention can be realized by the following technical scheme:

a super-magnetic separation water purification system with a quick separation function comprises the following steps:

the method comprises the following steps: the wastewater enters a coagulation tank in a coagulation system after being settled in a pre-settling tank, a flocculating agent and magnetic seeds are added into the coagulation tank to flocculate and aggregate impurities in the wastewater, and the pre-settled impurities enter a sludge tank;

step two: the flocculated wastewater enters a super-magnetic separator, flocculated impurities and water are separated under the magnetic action of a magnetic field, and the separated water is discharged outwards;

step three: the impurities after magnetic separation enter a magnetic seed recovery machine to recover the magnetic seeds and flow back to a coagulation tank, the rest impurities enter a sludge transfer tank and enter a sludge tank from the sludge transfer tank, and finally the impurities in the sludge tank enter a filter press to be filtered and then are discharged outwards.

Optionally, the flocculating agent in the first step is PAC and PAM.

Optionally, the filter press in step three is a chamber filter press.

A water purifying device is a box-type filter press used in the super-magnetic separation water purifying system with the rapid separation function, and the box-type filter press comprises a base, a top frame arranged on the upper portion of the base and a bottom frame arranged on the lower portion of the base.

Optionally, the inside slidable mounting of top frame has a plurality of filter plate, and both ends side all is provided with the jack about one side of filter plate, and the upper and lower both ends side of opposite side all is connected with the inserted bar of pegging graft corresponding with the jack, and the internally mounted of arbitrary jack has the second to open and stop the switch on same filter plate, and the equal slidable mounting in both sides of top frame has the box of stirring that is used for stirring the filter plate.

Optionally, the top of the filter plate is connected with a top plate of an "L" shape towards the top of one side of the inserted link, the horizontal end of the top plate is at the top, a movable plate capable of sliding up and down is installed below the top plate on the side of the filter plate, the top of the movable plate is connected with a pull rope, a storage shaft is installed below the horizontal end of the top plate in a rotating mode, the top end of the pull rope is wound outside the storage shaft, one end of the storage shaft is connected with an output shaft of a driving motor inside the movable plate, and the second start-stop switch is used for controlling the start and stop of the driving motor.

Optionally, both ends of one side of the movable plate facing the filter plate are connected with supporting rods, one ends of the supporting rods far away from the movable plate are provided with balls, sliding grooves used for installing the supporting rods are formed in both sides of the filter plate along the vertical direction, the length of the movable plate is smaller than the distance between two inserting rods at the same end, loading cavities are formed in both sides of the movable plate, a plurality of downward-inclined spray heads are installed inside the loading cavities, an air pump is installed at one end of the movable plate, and the air outlet end of the air pump is connected with the spray heads through a pipeline.

Optionally, the inside rotation of underframe is installed and is connect the flitch, and one side of underframe is provided with the discharge end, connects one side slidable mounting that the discharge end was kept away from at flitch top to have the push pedal that is used for promoting impurity, connects the top both ends of flitch all to be provided with the spout, and the inside top of spout is installed sheltering from of elastic material and is filled up, and electric slider and spout slidable mounting are all passed through at the bottom both ends of push pedal.

Optionally, the both ends of connecing the flitch all rotate the installation through the inside both ends of dwang and underframe, and the output shaft of the inside drive motor of bull stick tip and underframe of one end, and the inside one end of underframe is installed and is used for controlling the first switch that opens of electronic slider, can press first opening the switch that opens in connecing the flitch rotation, connect the flitch all around all with the underframe between the inner wall be connected with the rubber pad.

Optionally, a plurality of cutting ropes are installed along length direction above the bottom frame, the two ends of each cutting rope are connected with a moving seat, the moving seats are slidably installed on one side of a vertical plate, the bottoms of the vertical plates are connected with the top of the bottom frame, the vertical limiting grooves are formed in the installation sides of the vertical plates and the moving seats, the moving seats are slidably installed in the limiting grooves, and return springs are installed between the bottoms of the moving seats and the bottom ends of the limiting grooves.

The invention has the beneficial effects that:

1. the high-intensity magnetic field generated by the permanent magnetic material in the supermagnetic separator is utilized to rapidly separate the magnetized water suspended substances (alum blossom) under the action of the high-intensity magnetic field.

(1) The separation effect is good, the high-intensity magnetic field generated by the permanent magnetic material is used for quickly separating the magnetized water suspended matters (alum blossom) under the action of the high-intensity magnetic field, and the super magnetic force is hundreds of times of the gravity.

(2) The effluent quality is excellent, and the removal effect on SS (suspended matter content SS (mg/L)) is good, wherein SS is less than 20 mg/L.

(3) The impact load resistance is strong, the effluent is stable and reliable, partial sludge flows back, the sludge concentration of the flocculation tank is high, the sudden change of SS 2000mg/L of raw water can be accepted, and the stable treatment effect is ensured.

(4) Short treatment time, simple system process and total hydraulic retention time less than 10 min.

(5) The occupied area is small, the capital construction investment is saved, the occupied area is saved, the land utilization rate is high, the occupied area is 1/5 of that of an inclined tube sedimentation tank or dissolved air floatation and is 1/20 of that of the traditional sedimentation tank, and the engineering capital construction investment is greatly reduced. Is suitable for the underground space of a coal mine.

(6) The operation cost is low, the magnetic seeds are recycled, the recovery rate is higher than 99 percent, and the loss of the magnetic seeds is very little; part of sludge flows back, the dosage of the coagulant is saved by fully playing the utilization rate of the coagulant, and the operation cost is saved.

(7) The daily maintenance is simple, the service life of the equipment is long, the automation degree is high, and the operation management is simple; the equipment has small power, small abrasion and long service life.

(8) The device can be prized into an integrated device, the occupied area of the device is extremely small, the device can be effectively prized into a prizing device, the integrated device can be used as a temporary facility, and the device can be moved at any time or moved for other purposes in the future. The method is suitable for the application of the underground working face of the coal mine, and can be widely applied to water treatment sites such as mine water treatment, black and odorous water treatment and the like.

2. Through improving the pressure filter for when the filter plate removes and takes off the mud cake, both sides load the inside a plurality of shower nozzle of chamber and blow the air current respectively to both sides and the filter plate of mud cake contact, utilize the air current to accelerate the speed that the mud cake dropped downwards, improve the efficiency of work, the phenomenon that the mud cake bonding did not break away from on the filter plate can be avoided to the air current simultaneously to blow. Meanwhile, the airflow can blow the residual broken mud cakes on the filter plates to fall off, so that the mud cakes on the filter plates are cleaned more fully, and the follow-up use is more efficient. The side face of the filter plate, which is in contact with the mud cake, can be blown by air flow, extra operation is not needed during use, the movable plate can move up and down simultaneously by moving the filter plate, and the operation is simple and rapid.

3. Through setting up the cutting rope for the mud cake drops the in-process downwards at first with many cutting rope contacts, the cutting rope cuts the mud cake, reduces the space that the mud cake occupy, and the mud cake can be more even scatter on connecing the flitch and pile up, has improved the bearing capacity who connects the flitch. The cutting rope is pressed downwards after contacting the mud cake, the moving seat at the end part presses the return spring, the cutting rope moves downwards along with the return spring, and the height of the cutting rope is reduced. After the mud cake is separated from the cutting rope, the return spring pushes the moving seat to move upwards, and the cutting rope moves upwards to return to the original position. The cutting rope vibrates in the up-and-down moving process, so that the mud cake cutting rope can be prevented from being attached to the mud cake cutting rope, and the cutting rope is kept to have higher cutting capacity.

4. Can the pivoted connect the flitch through the installation for when connecing the piled up mud cake on the flitch and need clear up, the dwang drives and connects the flitch to rotate to that side of discharge end and empty. Simultaneously, the push plate pushes away mud cakes on the material receiving plate in the moving process of the discharge end, and the mud cakes are prevented from being bonded on the material receiving plate. Connect the flitch to empty the back that finishes on the flitch, connect the flitch to rotate and return home position, press the first switch that opens afterwards once more, electronic slider drives the push pedal and removes and get back to home position, treats next time to use, and the push pedal can carry out work along with the rotation that connects the flitch, has guaranteed in time going on of promotion.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic diagram of the filter plate structure of the present invention.

Fig. 3 is an enlarged view of detail B in fig. 2 according to the present invention.

Fig. 4 is a schematic diagram of the moving plate structure of the present invention.

FIG. 5 is an enlarged view of detail A in FIG. 1 according to the present invention.

Fig. 6 is a schematic view of a bottom frame structure according to the present invention.

Fig. 7 is a schematic view of the mounting structure of the bottom frame and the material receiving plate of the present invention.

Fig. 8 is a schematic flow diagram of a water purification system of the present invention.

In the figure: 1. a base; 2. a bottom frame; 3. cutting the rope; 4. shifting the box; 5. a top frame; 6. filtering the plate; 7. a jack; 8. a top plate; 9. a storage shaft; 10. pulling a rope; 11. moving the plate; 12. inserting a rod; 13. a support bar; 14. a ball bearing; 15. an air pump; 16. a spray head; 17. a loading chamber; 18. a movable seat; 19. a return spring; 20. a vertical plate; 21. a material receiving plate; 22. a chute; 23. pushing the plate; 24. a shield pad; 25. a rubber pad; 26. a first start-stop switch; 27. rotating the rod.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood 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. 1-8, a super magnetic separation water purification system with a fast separation function includes the following steps:

the method comprises the following steps: the wastewater enters a coagulation tank in a coagulation system after being settled in the preliminary sedimentation tank, a flocculating agent and magnetic seeds are added into the coagulation tank to flocculate and aggregate impurities in the wastewater, and the preliminary sedimentation impurities enter a sludge tank.

Step two: the flocculated waste water enters a super-magnetic separator, flocculated impurities and water are separated under the magnetic action of a magnetic field, and the separated water is discharged outwards.

Step three: the impurities after magnetic separation enter a magnetic seed recovery machine to recover the magnetic seeds and flow back to a coagulation tank, the rest impurities enter a sludge transfer tank and enter a sludge tank from the sludge transfer tank, and finally the impurities in the sludge tank enter a filter press to be filtered and then are discharged outwards.

As a technical optimization scheme of the invention, the flocculating agent in the first step is PAC and PAM.

As a technical optimization scheme of the invention, the filter press in the third step is a box filter press.

A water purifying device is a box-type filter press used in the super-magnetic separation water purifying system with the rapid separation function, and the box-type filter press comprises a base 1, a top frame 5 arranged on the upper part of the base and a bottom frame 2 arranged on the lower part of the base.

As a technical optimization scheme of the invention, a plurality of filter plates 6 are slidably mounted in a top frame 5, jacks 7 are respectively arranged on the upper end side and the lower end side of one side of each filter plate 6, inserting rods 12 which are correspondingly inserted into the jacks 7 are respectively connected to the upper end side and the lower end side of the other side of each filter plate 6, a second start-stop switch is mounted in any jack 7 on the same filter plate 6, toggle boxes 4 for toggling the filter plates 6 are slidably mounted on the two sides of the top frame 5, and the inserting rods 12 are inserted into the jacks 7, so that the filter plates 6 can be limited and the internal start-stop switches can be pressed.

As a technical optimization scheme of the invention, the top of one side, facing an insert rod 12, of the top of a filter plate 6 is connected with an L-shaped top plate 8, the horizontal end of the top plate 8 is at the top, a movable plate 11 capable of sliding up and down is arranged on the side edge of the filter plate 6 below the top plate 8, the top of the movable plate 11 is connected with a pull rope 10, a storage shaft 9 is rotatably arranged below the horizontal end of the top plate 8, the top end of the pull rope 10 is wound outside the storage shaft 9, one end of the storage shaft 9 is connected with an output shaft of a driving motor inside the movable plate 11, a second start-stop switch is used for controlling the start and stop of the driving motor, the storage shaft 9 can rotate to wind the pull rope 10, and then.

As a technical optimization scheme of the invention, two ends of one side of a movable plate 11, which faces a filter plate 6, are both connected with supporting rods 13, one end of each supporting rod 13, which is far away from the movable plate 11, is provided with a ball 14, two sides of the filter plate 6 are both provided with sliding grooves for mounting the supporting rods 13 in the vertical direction, the length of the movable plate 11 is smaller than the distance between two inserted rods 12 at the same end, two sides of the movable plate 11 are both provided with loading cavities 17, a plurality of downward-inclined spray heads 16 are mounted inside the loading cavities 17, one end of the movable plate 11 is provided with an air pump 15, the air outlet end of the air pump 15 is connected with the spray heads 16 through a pipeline, the supporting rods 13 can limit the movement of the movable plate 11 inside the sliding grooves, and the balls 14 reduce the friction force in the movement. The air flow from the nozzle 16 can blow and clean the side surface of the filter plate 6.

As a technical optimization scheme of the invention, a material receiving plate 21 is rotatably arranged in a bottom frame 2, a material discharging end is arranged on one side of the bottom frame 2, a push plate 23 used for pushing impurities is slidably arranged on one side, far away from the material discharging end, of the top of the material receiving plate 21, sliding grooves 22 are formed in two ends of the top of the material receiving plate 21, a shielding pad 24 made of elastic materials is arranged above the inside of each sliding groove 22, two ends of the bottom of each push plate 23 are slidably arranged with the corresponding sliding grooves 22 through electric sliding blocks, and each push plate 23 can move on the upper portion of the material receiving plate 21 so as to push mud cakes.

As a technical optimization scheme of the invention, two ends of the material receiving plate 21 are rotatably installed with two ends inside the bottom frame 2 through a rotating rod 27, the end part of the rotating rod 27 at one end is connected with an output shaft of a driving motor inside the bottom frame 2, a first start-stop switch 26 for controlling an electric slider is installed at one end inside the bottom frame 2, the first start-stop switch 26 can be pressed during the rotation of the material receiving plate 21, and a rubber pad 25 is connected between the periphery of the material receiving plate 21 and the inner wall of the bottom frame 2.

As a technical optimization scheme of the invention, a plurality of cutting ropes 3 are arranged above the bottom frame 2 along the length direction, two ends of each cutting rope 3 are connected with a moving seat 18, each moving seat 18 is slidably mounted on one side of a vertical plate 20, the bottom of each vertical plate 20 is connected with the top of the bottom frame 2, a limiting groove is vertically arranged on the mounting side of each vertical plate 20 and the corresponding moving seat 18, each moving seat 18 is slidably mounted in the corresponding limiting groove, a return spring 19 is mounted between the bottom of each moving seat 18 and the bottom end of the corresponding limiting groove, and the cutting ropes 3 cut mud cakes to reduce the space occupied by the mud cakes, so that the mud cakes can be scattered and stacked on the material receiving plate 21 more uniformly, and the bearing capacity of the material receiving plate 21 is improved.

When the magnetic separating device is used, a magnetic seed medium and a flocculating agent are added to wastewater after the wastewater is settled, so that suspended matters in water and magnetic seeds are agglomerated together to form magnetic alum blossom, and the magnetic alum blossom of the suspended matters in the water is quickly separated under the action of a high-intensity magnetic field generated by a permanent magnetic material in a super-magnetic separator. The super magnetic force is hundreds times of the gravity, so the super magnetic separation water treatment technology greatly shortens the hydraulic retention time due to the high separation speed, and provides technical support for the reduction of the occupied area of engineering facilities. The separated suspended matters are recycled by magnetic seeds and then discharged into a sludge pool, and finally are discharged outwards after being filter-pressed by a filter press.

After the filter press of the filter press, a plurality of filter plates 6 inside move one by one to one end on the upper part of the top frame 5, after the filter plates 6 move, the inserted rods 12 are separated from the insertion holes 7 inside the adjacent filter plates 6, so that the pressing force of the second start-stop switch inside the filter plates is lost, and the driving motor above the filter plates 6 to be moved does not work. When the movable filter plate 6 moves towards one end, the mud cake formed by filter pressing in the movable filter plate falls downwards, the movable plate 11 moves downwards under the action of gravity, meanwhile, the air pump 15 is started to work to deliver air to the spray nozzles 16, the spray nozzles 16 in the loading cavities 17 at two sides respectively blow air flow to the filter plate 6, the mud cake falls downwards, the working efficiency is improved, and meanwhile, the phenomenon that the mud cake is bonded on the filter plate 6 and cannot be separated is avoided due to the fact that the air flow blows. Meanwhile, the airflow can blow the residual broken mud cakes on the filter plates 6 to fall off, so that the mud cakes on the filter plates 6 are cleaned more fully, and the follow-up use is more efficient. After the moving filter plate 6 is transferred to the other end and contacts with the adjacent filter plate 6, the contact rod 12 is inserted into the jack 7, the driving motor is started to operate, the storage shaft 9 winds and stores the pull rope 10, and then the moving plate 11 is pulled to move upwards to return to the initial position. The side surfaces of the filter plates 6, which are in contact with mud cakes, can be blown by airflow, extra operation is not needed during use, the moving plate 11 can move up and down simultaneously by moving the filter plates 6, and the operation is simple and rapid.

The mud cake on the upper part falls downwards and enters the upper part of the material receiving plate 21 to be stacked. Mud cake drops the in-process downwards at first with the contact of many cutting ropes 3, cutting rope 3 cuts the mud cake, reduces the space that the mud cake took for the mud cake can be more even scatter on connecing flitch 21 and pile up, has improved the bearing capacity who connects flitch 21. The cutting rope 3 is pressed downwards after contacting the mud cake, the moving seat 18 at the end part presses the return spring 19, the cutting rope 3 moves downwards along with the return spring, and the height is reduced. After the mud cake is separated from the cutting rope 3, the return spring 19 pushes the moving seat 18 to move upwards, and the cutting rope 3 moves upwards to return to the original position. The cutting rope 3 vibrates in the up-and-down moving process, so that the mud cake cutting rope 3 can be prevented from being attached to the mud cake cutting rope 3, and the cutting rope 3 is kept to have higher cutting capacity.

When the mud cake piled up on the material receiving plate 21 needs to be cleaned, the rotating rod 27 drives the material receiving plate 21 to rotate to the side of the discharge end, the first start-stop switch 26 is pressed in the rotating process of the material receiving plate 21, and then the electric slide block drives the push plate 23 to move on the material receiving plate 21 along the sliding groove 22. The push plate 23 pushes the mud cake on the material receiving plate 21 in the moving process towards the discharge end, so that the mud cake is prevented from being bonded on the material receiving plate 21. After the mud cake on the material receiving plate 21 is poured, the material receiving plate 21 rotates to the original position, then the first start-stop switch 26 is pressed again, and the electric sliding block drives the push plate 23 to move to the original position for next use. The push plate 23 pushes and presses the shielding pad 24 in the moving process of the discharge end, and the shielding pad 24 does not influence the movement of the push plate 23. When the push plate 23 moves back, the blocking pad 24 automatically expands to block the upper part of the chute 22, so that the falling mud cake is prevented from entering the chute 22 to block the chute 22.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.