Fresh-keeping method and fresh-keeping device for agricultural products
阅读说明：本技术 一种农产品的保鲜方法及保鲜装置 (Fresh-keeping method and fresh-keeping device for agricultural products ) 是由 汪苏云 于 2020-07-14 设计创作，主要内容包括：本发明公开了农产品保鲜技术领域的一种农产品的保鲜方法及保鲜装置,包括保鲜箱,所述保鲜箱的两侧内壁均固定连接有驱动组件,所述驱动组件上连接有缓冲组件,两组所述缓冲组件相互远离的一端均固定连接在保鲜箱的内壁上,两组所述缓冲组件的相对侧均活动连接在放置板上,所述放置板的顶部均匀设置有放置槽,且放置板的底部均匀设置有漏水孔,通过风箱内的圆板转动,使得齿条板可以往复移动,进而通过齿轮转动,使得转动轴带动导风板往复左右摆动,实现了扫风功能,可以减少风冷死角,进而使得冷气可以均匀地进入保鲜箱内,从而使得冷气可以均匀地分布在保鲜箱内,完成了对农产品的保鲜工作。(The invention discloses a fresh-keeping method and a fresh-keeping device for agricultural products in the technical field of agricultural product fresh-keeping, which comprises a fresh-keeping box, wherein the inner walls of two sides of the fresh-keeping box are fixedly connected with driving components, the driving components are connected with buffer components, the ends, far away from each other, of the two buffer components are fixedly connected to the inner wall of the fresh-keeping box, the opposite sides of the two buffer components are movably connected to a placing plate, the top of the placing plate is uniformly provided with a placing groove, the bottom of the placing plate is uniformly provided with water leakage holes, a rack plate can move in a reciprocating manner by the rotation of a circular plate in an air box, and further, a rotating shaft drives an air guide plate to swing in a reciprocating manner from side to side by the rotation of a gear, so that the air sweeping function is realized, the dead angle of air cooling can be reduced, further, the fresh-keeping work of the agricultural products is completed.)
1. The utility model provides a fresh-keeping device of agricultural product, includes fresh-keeping case (1), its characterized in that: the fresh-keeping box is characterized in that the inner walls of two sides of the fresh-keeping box (1) are fixedly connected with driving assemblies (2), the driving assemblies (2) are connected with buffering assemblies (3), the ends, far away from each other, of the two buffering assemblies (3) are fixedly connected to the inner wall of the fresh-keeping box (1), the opposite sides of the two buffering assemblies (3) are movably connected to a placing plate (4), the top of the placing plate (4) is uniformly provided with a placing groove, the bottom of the placing plate (4) is uniformly provided with a water leakage hole, the two sides of the bottom of the placing plate (4) are movably connected with supporting assemblies (5), the ends, far away from each other, of the two supporting assemblies (5) are fixedly connected to the inner wall of the fresh-keeping box (1), the bottom of the fresh-keeping box (1) is communicated with a collecting box (6), a water outlet is formed in the collecting box (6), and the top of, the air cooler is characterized in that the output end of the air cooler (7) is communicated with an air delivery port (8) at the top of the fresh-keeping box (1), the bottom end of the air delivery port (8) is communicated with an air guide assembly (9) fixedly connected to the fresh-keeping box (1), transverse plates (10) are fixedly connected to the bottoms of two sides of the fresh-keeping box (1), fixed columns (11) are arranged at the bottoms of the transverse plates (10), universal wheels (12) are arranged at the bottoms of the fixed columns (11), and pull rods (13) are arranged on the upper portions of two sides of the fresh-keeping box (1).
2. An agricultural product freshness retaining device according to claim 1, wherein: drive assembly (2) are including mounting panel (21) of fixed connection on fresh-keeping case (1) inner wall, the bottom fixedly connected with motor (22) of mounting panel (21), be provided with lead screw (23) in the power pivot of motor (22), the spiro union has movable block (24) on lead screw (23), the bottom and the bearing frame (25) of fixed connection on fresh-keeping case (1) inner wall of lead screw (23) are connected, the right side of movable block (24) articulates there is connecting rod (26).
3. A freshness retaining device for agricultural products according to claim 2, wherein: the buffer component (3) comprises a fixed frame (31) fixedly connected to the inner wall of the fresh-keeping box (1), two groups of connecting blocks (37) and a fixed seat (38) which are identical in structure, strip-shaped sliding grooves (32) are transversely formed in the front side and the rear side of the top of the fixed frame (31), sliding blocks (33) are slidably connected inside the two groups of strip-shaped sliding grooves (32), fixing rods (34) are fixedly connected to opposite sides of the two groups of sliding blocks (33), opposite sides of the two groups of fixing rods (34) are fixedly connected to the connecting seat (35), the top of the connecting seat (35) is hinged to the bottom end of a connecting rod (26), a supporting spring (36) is arranged at the right end of the connecting seat (35), the right end of the supporting spring (36) is fixedly connected to the top of the connecting block (37), and the right end of, two sets of buffer drum (39) are installed through the bearing rotation to the opposite side of fixing base (38), and buffer drum (39) the right side with place board (4) swing joint, the top both sides all are provided with bracing piece (310) around connecting block (37), and are two sets of the one end that bracing piece (310) kept away from each other all is provided with sliding block (311), and sliding block (311) sliding connection in bar spout (32), two sets of the left end of sliding block (311) all is provided with stress spring (312), and is two sets of the equal fixed connection in the left end of stress spring (312) is on slider (33), the bottom both sides all are provided with guide bar (313) around connecting block (37), and guide bar (313) sliding connection is on fixed frame (31).
4. An agricultural product freshness retaining device according to claim 1, wherein: the supporting assembly (5) comprises a supporting frame (51), grooves (52) are arranged on two sides of the supporting frame (51), return springs (53) are fixedly connected to the inner wall of the bottom of each groove (52), the top ends of the return springs (53) are connected with vertical rods (54), the supporting frame (51) is penetrated through the top ends of the vertical rods (54), the supporting frame is two groups, mounting seats (55) are arranged on the top ends of the vertical rods (54), the opposite sides of the mounting seats (55) are rotated through bearings to install supporting rollers (56), and the top of the supporting rollers (56) is movably connected with a placing plate (4).
5. An agricultural product freshness retaining device according to claim 1, wherein: the air guide assembly (9) comprises an air box (91) fixedly connected to the inner wall of the top of the fresh-keeping box (1), the air box (91) is communicated with the air conveying port (8), a rotating shaft (92) is uniformly installed on the inner wall of the air box (91) through a bearing, an air guide plate (93) is sleeved on the rotating shaft (92), the bottom of the air guide plate (93) penetrates through the air box (91), a movable through groove matched with the air guide plate (93) is formed in the bottom of the air box (91), a gear (94) is sleeved on the front side of the rotating shaft (92), the top of the gear (94) is meshed with rack plates (95), transverse rods (96) are arranged at the ends, far away from each other, of the two groups of transverse rods (96) penetrate through the air box (91), and the ends, close to each other, of the two groups of rack plates (95) are fixedly connected to a movable frame (97), the movable frame (97) is movably connected to the round rod (98), the rear end of the round rod (98) is fixedly connected to the top of the front side of the round plate (99), the round plate (99) is connected to the power rotating shaft of the servo motor in a sleeved mode, and the servo motor is fixedly connected to the outer wall of the rear side of the fresh-keeping box (1).
6. An agricultural product freshness retaining device according to claim 1, wherein: the bottom of the two sides of the fresh-keeping box (1) is provided with vent grooves, and active carbon layers are arranged in the vent grooves.
7. A freshness retaining device for agricultural products according to claim 2, wherein: the fresh-keeping case is characterized in that the movable block (24) is movably connected to the inner wall of the fresh-keeping case (1), the left end of the movable block (24) is provided with a guide block, and a guide groove matched with the guide block is vertically arranged on the inner wall of the fresh-keeping case (1).
8. An agricultural product freshness retaining device according to claim 1, wherein: the front side of the fresh-keeping box (1) is hinged with a box door through a hinge, and a rectangular observation window is arranged on the box door.
9. A method for keeping agricultural products fresh according to any one of claims 1 to 8, wherein: the method comprises the following steps:
s1: opening a box door of the fresh-keeping box (1), placing the agricultural products in a placing groove on a placing plate (4), closing the box door, and starting an air cooler (7) and a servo motor;
s2: the air cooler (7) works, cold air can pass through the air conveying opening (8) into the air box (91), the servo motor works to enable the circular plate (99) to rotate, the circular plate (99) rotates to enable the rack plate (95) to move in a reciprocating mode, and further the gear (94) rotates to enable the rotating shaft (92) to drive the air guide plate to swing left and right in a reciprocating mode, the air sweeping function is achieved, air cooling dead angles can be reduced, the cold air can uniformly enter the fresh-keeping box (1), the cold air can be uniformly distributed in the fresh-keeping box (1), fresh-keeping work of agricultural products is completed, and the fresh-keeping effect is improved;
s3: during transportation, the shaking is transmitted to the fresh-keeping box (1), so that the placing plate (4) shakes, the vertical shaking enables the vertical rod (54) to compress the reset spring (53), and the vertical rod (54) can generate friction with the support frame (51) when compressing the reset spring (53), so that the movement of the vertical rod (54) can be hindered, the vertical shaking of the placing plate (4) is further reduced, similarly, the horizontal shaking enables the connecting block (37) to move, and the horizontal shaking of the placing plate (4) can be reduced by hindering the movement of the connecting block (37), so that the shaking and damage of agricultural products on the placing plate (4) can be avoided;
s4: when taking out agricultural product, starter motor (22) for lead screw (23) anticlockwise rotation, and then make movable block (24) rebound, can drive connecting seat (35) through connecting rod (26) and remove left, and then drive buffer roller (39) through supporting spring (36) and keep away from and place board (4), then can will place board (4) and pull out, be convenient for take out the agricultural product that is located inside, facilitate the use.
Technical Field
The invention relates to the technical field of agricultural product preservation, in particular to a preservation method and a preservation device for agricultural products.
Background
After agricultural product picked, can not expose in the air for a long time, need preserve through special storage device, a fresh-keeping device for agricultural product generally preserves agricultural product through the cold-stored mode of low temperature, present fresh-keeping device is when letting in air conditioning, because the velocity of flow of air conditioning is too fast, lead to in air conditioning can not the even access device, it is not good to lead to cold-stored effect, and when transporting agricultural product through fresh-keeping device, the vehicle rocks and can lead to agricultural product to rock, make agricultural product damage easily, and when needing to take out agricultural product, be located the agricultural product of inside and be difficult for taking out, for this reason, we propose a fresh-keeping method and fresh-keeping device of agricultural product.
Disclosure of Invention
The invention aims to provide a fresh-keeping method and a fresh-keeping device for agricultural products, and aims to solve the problems that when cold air is introduced into the conventional fresh-keeping device in the background art, the cold air cannot uniformly enter the device due to too high flow rate of the cold air, so that the refrigeration effect is poor, and when the agricultural products are transported by the fresh-keeping device, the agricultural products are easy to damage due to shaking of vehicles, and the agricultural products in the fresh-keeping device are difficult to take out when the agricultural products need to be taken out.
In order to achieve the purpose, the invention provides the following technical scheme: a fresh-keeping device for agricultural products comprises a fresh-keeping box, wherein driving components are fixedly connected to the inner walls of two sides of the fresh-keeping box, buffering components are connected to the driving components, the ends, far away from each other, of the two buffering components are fixedly connected to the inner wall of the fresh-keeping box, the opposite sides of the two buffering components are movably connected to a placing plate, a placing groove is uniformly formed in the top of the placing plate, water leakage holes are uniformly formed in the bottom of the placing plate, supporting components are movably connected to two sides of the bottom of the placing plate, the ends, far away from each other, of the two supporting components are fixedly connected to the inner wall of the fresh-keeping box, a collecting box is communicated with the bottom of the fresh-keeping box, a water outlet is formed in the collecting box, an air cooler is fixedly connected to the top of the fresh-keeping box, the output end of the air cooler is communicated with an air delivery port in the, the bottom of fresh-keeping case both sides all fixedly connected with diaphragm, the bottom of diaphragm all is provided with the fixed column, the bottom of fixed column all is provided with the universal wheel, the both sides upper portion of fresh-keeping case all is provided with the pull rod.
Preferably, drive assembly includes the mounting panel of fixed connection on the fresh-keeping incasement wall, the bottom fixedly connected with motor of mounting panel, be provided with the lead screw in the power pivot of motor, the spiro union has the movable block on the lead screw, the bottom and the bearing frame of fixed connection on the fresh-keeping incasement wall of lead screw are connected, the right side of movable block articulates there is the connecting rod.
Preferably, the buffering component comprises a fixed frame fixedly connected to the inner wall of the fresh-keeping box, two groups of connecting blocks and a fixed seat, wherein the two groups of connecting blocks and the fixed seat are identical in structure, strip-shaped sliding grooves are transversely formed in the front side and the rear side of the top of the fixed frame, sliding blocks are slidably connected inside the two groups of strip-shaped sliding grooves, fixed rods are fixedly connected to the opposite sides of the two groups of sliding blocks, the opposite sides of the two groups of fixed rods are fixedly connected to the connecting seat, the top of the connecting seat is hinged to the bottom end of the connecting rod, a supporting spring is arranged at the right end of the connecting seat, the right end of the supporting spring is fixedly connected to the connecting block at the top, the right end of the connecting block is fixedly connected to the fixed seat, buffering rollers are, two sets of the one end that the bracing piece was kept away from each other all is provided with the sliding block, and sliding block sliding connection is two sets of in the bar spout the left end of sliding block all is provided with stress spring, and is two sets of stress spring's the equal fixed connection in left end is on the sliding block, the bottom both sides all are provided with the guide bar around the connecting block, and guide bar sliding connection is on fixed frame.
Preferably, the supporting component comprises a supporting frame, grooves are formed in the two sides of the supporting frame, return springs are fixedly connected to the inner walls of the bottoms of the grooves, the top ends of the return springs are connected with vertical rods, the top ends of the vertical rods penetrate through the supporting frame and are two groups, mounting seats are arranged on the top ends of the vertical rods and are two groups, supporting rollers are installed on the opposite sides of the mounting seats in a rotating mode through bearings, and the tops of the supporting rollers are movably connected with a placing plate.
Preferably, the air guide assembly comprises an air box fixedly connected to the inner wall of the top of the preservation box, the air box is communicated with the air delivery port, the inner wall of the air box is uniformly provided with a rotating shaft through a bearing, the rotating shaft is sleeved with an air deflector, the bottom of the air deflector penetrates through the air box, the bottom of the air box is provided with a movable through groove matched with the air deflector, the front side of the rotating shaft is sleeved with a gear, the top of the gear is meshed with the rack plates, the ends of the two groups of rack plates far away from each other are provided with cross rods, the ends of the two groups of cross rods far away from each other penetrate through the air box, the ends of the two groups of rack plates close to each other are fixedly connected to the movable frame, the movable frame is movably connected on a round rod, the rear end of the round rod is fixedly connected on the top of the front side of the round plate, the circular plate is sleeved on a power rotating shaft of the servo motor, and the servo motor is fixedly connected to the outer wall of the rear side of the fresh-keeping box.
Preferably, the bottoms of the two sides of the fresh-keeping box are both provided with vent grooves, and the vent grooves are both internally provided with activated carbon layers.
Preferably, the movable block swing joint is on the inner wall of fresh-keeping case, the left end of movable block is provided with the guide block, and vertically on the inner wall of fresh-keeping case be provided with guide block assorted guide way.
Preferably, the front side of the preservation box is hinged with a box door through a hinge, and the box door is provided with a rectangular observation window.
Preferably, the method for keeping agricultural products fresh specifically comprises the following steps:
s1: opening a box door of the preservation box, placing the agricultural products in a placing groove on a placing plate, closing the box door, and starting an air cooler and a servo motor;
s2: the air cooler works, the air can pass through the cold air into the air box through the air delivery port, the servo motor works to enable the circular plate to rotate, the circular plate rotates to enable the rack plate to move in a reciprocating mode, and then the rotating shaft drives the air guide plate to swing left and right in a reciprocating mode through the rotation of the gear, so that the air sweeping function is achieved, air cooling dead angles can be reduced, the cold air can uniformly enter the fresh-keeping box, the cold air can be uniformly distributed in the fresh-keeping box, the fresh-keeping work of agricultural products is finished, and the fresh-keeping effect is improved;
s3: during transportation, the shaking is transmitted to the fresh-keeping box, so that the placing plate shakes, the shaking in the vertical direction enables the vertical rods to compress the return springs, and the vertical rods can generate friction force with the supporting frame when compressing the return springs, so that the movement of the vertical rods can be hindered, the shaking in the vertical direction of the placing plate is further reduced, similarly, the shaking in the horizontal direction enables the connecting blocks to move, and the shaking in the horizontal direction of the placing plate can be reduced by hindering the movement of the connecting blocks, so that the shaking and damage of agricultural products on the placing plate can be avoided;
s4: when taking out agricultural product, starter motor for the lead screw counter-clockwise turning, and then make the movable block rebound, can drive the connecting seat through the connecting rod and remove left, and then drive buffer roller through supporting spring and keep away from and place the board, then can will place the board and pull out, be convenient for take out the agricultural product that is located the inside, facilitate the use.
Compared with the prior art, the invention has the beneficial effects that: air-cooler work, can pass through air conditioning in to bellows through defeated wind gap, circular plate through in the bellows rotates, make rack plate reciprocating motion, and then through gear revolve, make the axis of rotation drive the reciprocal horizontal hunting of aviation baffle, realized sweeping the wind function, can reduce the forced air cooling dead angle, and then make air conditioning can get into fresh-keeping incasement uniformly, thereby make air conditioning can distribute at fresh-keeping incasement uniformly, the fresh-keeping work to agricultural product has been accomplished, and the fresh-keeping effect has been improved, remove through drive assembly drive connecting seat, conveniently take out agricultural product, and when need not take out, through drive assembly drive connecting seat reverse movement, can play the effect of protection agricultural product.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view at A of the present invention;
FIG. 3 is a front view of a buffer assembly according to the present invention;
FIG. 4 is a schematic top view of a cushioning assembly according to the present invention;
FIG. 5 is a schematic view of the structure of the present invention at B;
FIG. 6 is a side view of the support assembly of the present invention;
fig. 7 is a schematic structural view of the air guide assembly of the present invention.
In the figure: 1. a fresh-keeping box; 2. a drive assembly; 21. mounting a plate; 22. a motor; 23. a screw rod; 24. a movable block; 25. a bearing seat; 26. a connecting rod; 3. a buffer assembly; 31. a fixing frame; 32. a strip-shaped chute; 33. a slider; 34. fixing the rod; 35. a connecting seat; 36. a support spring; 37. connecting blocks; 38. a fixed seat; 39. a buffer roller; 310. a support bar; 311. a slider; 312. a stress spring; 313. a guide bar; 4. placing the plate; 5. a support assembly; 51. a support frame; 52. a groove; 53. a return spring; 54. a vertical rod; 55. a mounting seat; 56. a support roller; 57. a connecting plate; 6. a collection box; 7. an air cooler; 8. an air delivery opening; 9. an air guide assembly; 91. an air box; 92. a rotating shaft; 93. an air deflector; 94. a gear; 95. a rack plate; 96. a cross bar; 97. a movable frame; 98. a round bar; 99. a circular plate; 10. a transverse plate; 11. fixing a column; 12. a universal wheel; 13. a pull rod.
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.
The invention provides a technical scheme that: a fresh-keeping device for agricultural products, please refer to figure 1, comprising a fresh-keeping box 1, wherein the inner walls of two sides of the fresh-keeping box 1 are fixedly connected with driving
referring to fig. 1 and 7, an
Please refer to fig. 1 and fig. 2, the driving
Referring to fig. 2, 3 and 4, the buffer assembly 3 includes a fixed frame 31 fixedly connected to the inner wall of the fresh-keeping box 1, two sets of connecting blocks 37 and fixing seats 38 with the same structure, bar-shaped sliding grooves 32 are transversely formed on the front and rear sides of the top of the fixed frame 31, sliding blocks 33 are slidably connected inside the two sets of bar-shaped sliding grooves 32, fixing rods 34 are fixedly connected to the opposite sides of the two sets of sliding blocks 33, the opposite sides of the two sets of fixing rods 34 are fixedly connected to the connecting seat 35, the top of the connecting seat 35 is hinged to the bottom end of the connecting rod 26, a supporting spring 36 is arranged at the right end of the connecting seat 35, the right end of the supporting spring 36 is fixedly connected to the top connecting block 37, the right end of the connecting block 37 is fixedly connected to the fixing seat 38, a buffer roller 39 is rotatably installed on the opposite sides of the two sets of fixing seats 38, the front and back sides of the top connecting block 37 are provided with supporting rods 310, the ends of the two groups of supporting rods 310 far away from each other are provided with sliding blocks 311, the sliding blocks 311 are slidably connected in the strip-shaped sliding grooves 32, the left ends of the two groups of sliding blocks 311 are provided with stress springs 312, the left ends of the two groups of stress springs 312 are fixedly connected on the sliding blocks 33, when in shaking, the placing plate 4 extrudes the buffer roller 39 to move the fixing seat 38, further the connecting block 37 is driven to extrude the supporting spring 36 and the sliding blocks 311 on the supporting rods 310 extrude the stress springs 312, the sliding blocks 311 slide in the strip-shaped sliding grooves 32 to provide a moving resistance for the buffer roller 39, further the shaking of the buffer roller 39 can be reduced, thereby the shaking of the placing plate 4 in the horizontal direction can be reduced, the front and back sides of the bottom connecting block 37 are provided, so that the buffer roller 39 is relatively stable when moving.
Referring to fig. 5 and 6, the supporting
Referring to fig. 1 and 7, the air guiding assembly 9 includes an air box 91 fixedly connected to the inner wall of the top of the fresh keeping box 1, the air box 91 is communicated with the air delivery port 8, a rotating shaft 92 is uniformly installed on the inner wall of the air box 91 through a bearing, an air guiding plate 93 is sleeved on the rotating shaft 92, the bottom of the air guiding plate 93 penetrates through the air box 91, a movable through groove matched with the air guiding plate 93 is arranged at the bottom of the air box 91, the air guiding plate 93 conveniently rotates along with the rotating shaft 92, a gear 94 is sleeved on the front side of the rotating shaft 92, the top of the gear 94 is meshed with the rack plates 95, the ends of the two sets of rack plates 95 far away from each other are provided with cross rods 96, the ends of the two sets of cross rods 96 far away from each other penetrate through the air box 91, the cross rods 96 play a role of guiding the rack plates 95, the ends of the two sets, the rear end of the round rod 98 is fixedly connected to the top of the front side of the round plate 99, the round plate 99 is sleeved on the power rotating shaft of the servo motor, the servo motor is fixedly connected to the outer wall of the rear side of the fresh-keeping box 1, the servo motor is connected with the power rotating shaft through the speed reducer, the round plate 99 rotates through the work of the servo motor, the round rod 98 rotates around the center of the round plate 99, the movable frame 97 can horizontally reciprocate through the rotation of the round rod 98, and further the rack plate 95 is driven to horizontally reciprocate, through the meshing relationship between the rack plate 95 and the gear 94, the gear 94 can rotate in a positive and negative alternate manner, further the rotating shaft 92 rotates in a positive and negative alternate manner, so that the wind deflector 93 can swing left and right, when cold wind passes through the wind deflector 93, the wind sweeping work can be realized through the guidance of the wind deflector 93, the wind-cooling dead angle is reduced, and further the cold wind can, thereby make air conditioning can distribute in fresh-keeping case 1 uniformly, accomplished the fresh-keeping work to agricultural product, and improved fresh-keeping effect.
Referring to fig. 1, the bottom of the preservation box 1 is provided with vent grooves, and the vent grooves are provided with activated carbon layers, which can absorb peculiar smell, so that the preservation box 1 has no peculiar smell.
Referring to fig. 2, the
Referring to fig. 1, a box door (not shown) is hinged to the front side of the fresh-keeping box 1 through a hinge, and a rectangular observation window is formed in the box door, so that the placing condition of agricultural products can be conveniently observed through the observation window.
A method for preserving agricultural products comprises the following steps:
s1: opening a box door of the preservation box 1, placing the agricultural products in a placing groove on a
s2: the
s3: during transportation, the shaking is transmitted to the preservation box 1, so that the placing
s4: when taking out agricultural product,
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.
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