Disclosure of Invention
The invention aims to provide a seed cleaning and processing device with a water circulation mechanism for agricultural production, which solves the problem that due to the fact that the good product rate of melon seeds is uneven, full-grained seeds can sink into water, and shriveled seeds can float in the water along with pulp, when the seeds need to be harvested after cleaning is finished, water in the device needs to be completely discharged through a filtering device, the melon seeds in the water are filtered and collected, and the problem of resource waste is greatly increased by the collection mode.
In order to achieve the purpose, the invention provides the following technical scheme: a seed cleaning and processing device with a water circulation mechanism for agricultural production comprises a device body, wherein the device body comprises a processing box, a partition plate and a cleaning box, a feed inlet is fixedly arranged at the top end of the processing box, a feed plate is fixedly arranged on the inner sides of the processing box and the partition plate, the feed plate is in an inclined shape, a discharge hole is formed in the partition plate, a top frame is fixedly arranged at the top end of the cleaning box, a first servo motor is fixedly arranged at the top end of the top frame, a stirring shaft is fixedly arranged at the bottom end of the first servo motor, the bottom end of the stirring shaft penetrates through openings in the top frame and the cleaning box and extends to the interior of the cleaning box, a first fixing plate is fixedly arranged on the inner sides of the cleaning box and the partition plate, the bottom end of the stirring shaft is movably connected with the top end of the first fixing plate through a bearing, and a water adding pipe, and a valve is arranged on the water feeding pipe, one side of the cleaning box, which is far away from the separation plate, is fixedly provided with a water outlet pipe, a valve is arranged on the water outlet pipe, one side of the cleaning box, which is far away from the separation plate, is fixedly provided with a mounting plate, the top end of the mounting plate is fixedly provided with a water pump, the water pumping end of the water pump extends to the inside of the cleaning box, one side of the treatment box, which is far away from the separation plate, is fixedly provided with a control panel, the bottom end of the treatment box is fixedly provided with a second servo motor, the top end of the second servo motor is fixedly provided with a screw rod, the top end of the screw rod passes through a sealing ring to extend to the inside of the treatment box through an opening on the bottom end of the treatment box, the top end of the screw rod is movably, the top end of the first fixed shaft is connected with the bottom end of the feeding plate through a bearing, the outer side of the first fixed shaft is movably sleeved with a movable plate, the outer side of the movable plate is sleeved with a sealing ring, the sealing ring on the outer side of the movable plate is tightly attached to one side of the processing box and one side of the partition plate, the side, close to each other, of the movable plate is fixedly connected with a thread sleeve, one side, far away from the processing box, of the partition plate is fixedly provided with a second fixed plate, one side, far away from the cleaning box, of the second fixed plate is fixedly provided with two extension springs, one ends, far away from the second fixed plate, of the two extension springs are fixedly provided with a sealing plate, the sealing plate extends into a through groove in the partition plate, the bottom end of the processing box is fixedly provided with a drain pipe, the bottom end of, the utility model discloses a portable water treatment device, including the inlet tube, the inboard fixed mounting of outlet pipe and inlet tube has the collecting box, the front of collecting box all has the hatch door through hinge movable mounting, one side fixed mounting that is close to the inlet tube of collecting box has first filter screen, the inner wall top of handling the case is equipped with peeling mechanism, the inside of collecting box is equipped with prevents stifled mechanism.
Preferably, the top end of the feeding plate is fixedly provided with an exhaust pipe, and the outer side of the exhaust pipe is fixedly provided with a filter ball.
Preferably, a protective cylinder is fixedly installed on the outer side of the stirring shaft, and a plurality of through holes are uniformly formed in the protective cylinder.
Preferably, two the belt pulley is all cup jointed in the outside of first fixed axle and lead screw and is installed, and is three the connecting band is installed in the outside winding of belt pulley, the first fixed axle outside of movable plate bottom all cup joints and installs and clean the blanket wheel, and clean the bottom of blanket wheel and all laminate mutually with the inner wall bottom of handling the case.
Preferably, a first connecting rod is fixedly mounted on one side of the sealing plate on the inner side of the extension spring, the first connecting rod penetrates through an opening in the second fixing plate and extends to the outer side of the second fixing plate, a second connecting rod is fixedly mounted at the bottom end of the magnet sealing cover, and the second connecting rod penetrates through an opening in the third fixing plate and extends to the outer side of the bottom end of the third fixing plate.
Preferably, peeling means includes first mounting bracket, the inner wall top fixed mounting who handles the case has first mounting bracket, bearing movable mounting has the second fixed axle in one side of first mounting bracket, and the second fixed axle one end of keeping away from the bearing passes the inside that the opening on the division board extends to the roof-rack, the inside (mixing) shaft outside of roof-rack is cup jointed and is installed second bevel gear, the inboard second fixed axle outside of roof-rack is cup jointed and is installed first bevel gear, and first bevel gear and second bevel gear intermeshing, the inboard second fixed axle outside of processing case is cup jointed and is installed a plurality of cover and connect the ring, the even fixed mounting in the outside of cover and connect the ring has a plurality of conical heads, and the top of conical head passes the opening on the top of handling the case and extends to the outside of handling the case, the even fixed mounting in top of handling the case has a plurality of fender fra.
Preferably, the inner wall one side fixed mounting who handles the case has the second mounting bracket, there is the baffle one side of second mounting bracket through pivot movable mounting, the top fixed mounting of baffle has first compression spring, first compression spring keeps away from the one end of baffle and handles incasement wall one side fixed connection, there is the third fixed axle through bearing movable mounting between the front and back two sides of handling the case, the even fixed mounting in the outside of third fixed axle has a plurality of flitches that connect.
Preferably, prevent that stifled mechanism is including the installation pole, the inside of collecting box is equipped with the installation pole, and the both ends of installation pole respectively with inner wall one side fixed connection of drain pipe and inlet tube, the inside fixed mounting of collecting box has the backup pad, and the quantity of backup pad is two, the backup pad is kept away from the equal fixed mounting in the installation pole outside of inlet tube one side has the second compression spring, the backup pad is kept away from the installation pole outside of inlet tube one side and all has the second filter screen, and one side of second filter screen all with second compression spring fixed connection, the top and the bottom of collecting box all fixed mounting have a set of communicating pipe, and the quantity of every communicating pipe of group all is two.
Compared with the prior art, the invention has the beneficial effects that:
1. after melon seeds are cleaned in the cleaning box, the second servo motor is started, the movable plate moves upwards at the moment, water sources in the cleaning box and the melon seeds enter the inside of the processing box from an opening in the partition plate due to pressure difference between the processing box and the cleaning box, after the movable plate moves downwards, the water in the processing box and the melon seeds are pressed into the inside of the drain pipe, after water flow moves continuously, the melon seeds are in contact with the first filter screen and are blocked in the collecting box by the first filter screen, and melon pulp passes through gaps in the melon seeds and the first filter screen due to continuous impact of high-pressure water flow and enters the inside of the processing box through the water inlet pipe, and the melon pulp is less in density, so the melon pulp can float on the surface of the water in the cleaning box, the melon pulp on the surface can be pumped out through the water pump at the moment, the circulation washing of the melon seeds can be started, and the melon seeds and the melon pulp can be separated through the method, and need not to discharge the water source and can take out the melon seed after the washing, when also having avoided extracting the melon pulp, take out the melon seed together and lead to the condition emergence of secondary work, the wasting of resources when having reduced the device use, and then has promoted the feature of environmental protection of device.
2. Through being provided with anti-blocking mechanism, make and get into the inside back and the contact of second filter screen of collecting box when melon seed, the second filter screen can block melon seed this moment, because the continuous impact of rivers, the melon pulp passes the clearance between melon seed and the second filter screen and continuously moves right, when water pressure is too big in the twinkling of an eye, when leading to the second filter screen to take place to block up, the second filter screen moves right, and drive second compression spring compression deformation, move right to a definite position after when the second filter screen, water source accessible is continuous to be carried right communicating pipe, can avoid melon seed and melon pulp to take place to block up in the collecting box is inside through this kind of mode, the condition that influences the device use takes place.
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. 1-7, an embodiment of the present invention is shown:
a seed cleaning and processing device with a water circulation mechanism for agricultural production comprises a device body 100, wherein a first servo motor 116, a second servo motor 120 and a water pump 138 which are used in the device are directly purchased products in the market, the principle and the connection mode of the first servo motor 116, the second servo motor 120 and the water pump 138 are well known in the prior art, and therefore the description is omitted, the output end of a control panel 142 is electrically connected with the input ends of the first servo motor 116, the second servo motor 120 and the water pump 138 through conducting wires, the device body 100 comprises a processing box 110, a partition plate 132 and a cleaning box 114, a feed inlet 111 is fixedly arranged at the top end of the processing box 110, a feed plate 112 is fixedly arranged on the inner sides of the processing box 110 and the partition plate 132, the feed plate 112 is inclined, a discharge port 113 is arranged on the partition plate 132, a top frame 115 is fixedly arranged at the top end of the cleaning box 114, a first servo motor 116 is fixedly, a stirring shaft 117 is fixedly installed at the bottom end of the first servo motor 116, the bottom end of the stirring shaft 117 passes through openings on the top frame 115 and the cleaning box 114 and extends to the inside of the cleaning box 114, a first fixing plate 119 is fixedly installed at the inner sides of the cleaning box 114 and the partition plate 132, the bottom end of the stirring shaft 117 is movably connected with the top end of the first fixing plate 119 through a bearing, a water adding pipe 144 is fixedly installed at one side of the cleaning box 114 far away from the partition plate 132, a valve is installed on the water adding pipe 144, a water outlet pipe 143 is fixedly installed at one side of the cleaning box 114 far away from the partition plate 132, a valve is installed on the water outlet pipe 143, an installation plate 137 is fixedly installed at one side of the cleaning box 114 far away from the partition plate 132, a water pump 138 is fixedly installed at the top end of the installation plate 137, a water pumping end of the water pump 138 extends to the inside of the, a screw rod 121 is fixedly installed at the top end of the second servo motor 120, the top end of the screw rod 121 passes through an opening at the bottom end of the treatment box 110 through a sealing ring and extends into the treatment box 110, the top end of the screw rod 121 is movably connected with the bottom end of the feeding plate 112 through a bearing, a threaded sleeve 122 is movably installed at the outer side of the screw rod 121, first fixing shafts 124 are movably installed at two sides of the bottom end of the inner wall of the treatment box 110 through bearings, the top ends of the first fixing shafts 124 are connected with the bottom end of the feeding plate 112 through bearings, a moving plate 123 is movably sleeved and installed at the outer side of the first fixing shafts 124, a sealing ring is sleeved and installed at the outer side of the moving plate 123, the sealing ring at the outer side of the moving plate 123 is tightly attached to one side of the treatment box 110 and one side of the partition plate 132, one side of the moving plate 123 close to, a second fixing plate 133 is fixedly installed on one side of the partition plate 132 far away from the processing box 110, two extension springs 134 are fixedly installed on one side of the second fixing plate 133 far away from the cleaning box 114, a sealing plate 135 is fixedly installed on one end of each extension spring 134 far away from the second fixing plate 133, the sealing plate 135 extends into a through groove on the partition plate 132, a drain pipe 128 is fixedly installed at the bottom end of the processing box 110, a water inlet pipe 130 is fixedly installed at the bottom end of the cleaning box 114, a third fixing plate 139 is fixedly installed inside the water inlet pipe 130, a magnet sealing cover 141 is installed at the top end of the water inlet pipe 130, a collecting box 129 is fixedly installed on the inner sides of the drain pipe 128 and the water inlet pipe 130, a cabin door 145 is movably installed on the front surface of the collecting box 129 through a hinge, a first filter screen 131 is fixedly installed on one side, the anti-blocking mechanism 300 is arranged inside the collecting box 129, when the melon seeds are cleaned in the cleaning box 114, the second servo motor 120 is started, the moving plate 123 moves upwards at the moment, due to the pressure difference between the processing box 110 and the cleaning box 114, the water source in the cleaning box 114 and the melon seeds enter the processing box 110 from the opening on the partition plate 132, when the moving plate 123 moves downwards, the water in the processing box 110 and the melon seeds are pressed into the drainage pipe 128, when the water flow moves continuously, the melon seeds are in contact with the first filter screen 131 and are blocked inside the collecting box 129 by the first filter screen 131, and the pulp passes through the gaps on the melon seeds and the first filter screen 131 due to the continuous impact of the high-pressure water flow and enters the processing box 110 through the water inlet pipe 130, and the pulp floats on the surface of the water in the cleaning box 114 due to the low density of the pulp, and the pulp on the surface can be pumped away by the water pump 138, can begin to circulate to the melon seed and wash this moment, can separate melon seed and melon pulp through this kind, and need not to discharge the water source and can take out the melon seed after washing, when also having avoided the extraction to the melon pulp, take out the melon seed together and lead to the condition emergence of needs secondary work, the wasting of resources when having reduced the device use, and then promoted the feature of environmental protection of device.
Further, the outside fixed mounting of (mixing) shaft 117 has a protection section of thick bamboo 118, and evenly seted up a plurality of through-holes on the protection section of thick bamboo 118, avoids getting into the inside back of wasing case 114 when the melon seed, with the (mixing) shaft 117 direct contact under the operating condition, leads to the melon seed to take place the condition of damaging, has promoted the yields that this device was handled the melon seed.
Further, the outer sides of the two first fixing shafts 124 and the screw rod 121 are all sleeved with belt pulleys 125, the outer sides of the three belt pulleys 125 are wound with connecting belts 126, the outer side of the first fixing shaft 124 at the bottom end of the moving plate 123 is sleeved with a cleaning sleeve wheel 127, the bottom end of the cleaning sleeve wheel 127 is attached to the bottom end of the inner wall of the processing box 110, when the screw rod 121 rotates, the first fixing shaft 124 is driven to rotate, the cleaning sleeve wheel 127 at the outer side of the first fixing shaft 124 is in a working state at the moment, the water source left at the bottom end of the processing box 110 is driven to move, on one hand, melon pulp is prevented from being condensed at the bottom end of the processing box 110 into a mass, difficulty is caused in subsequent cleaning, on the other hand, melon seeds and the like in the water source can be.
Further, a first connecting rod 136 is fixedly installed on one side of the sealing plate 135 inside the extension spring 134, the first connecting rod 136 extends to the outside of the second fixing plate 133 through an opening on the second fixing plate 133, a second connecting rod 140 is fixedly installed at the bottom end of the magnet sealing cover 141, the second connecting rod 140 extends to the outside of the bottom end of the third fixing plate 139 through an opening on the third fixing plate 139, and when the sealing plate 135 and the magnet sealing cover 141 move outward to a certain position, the first connecting rod 136 and the second connecting rod 140 are respectively attached to the second fixing plate 133 and the third fixing plate 139, so that the situation that the outward movement amplitude of the sealing plate 135 and the magnet sealing cover 141 is too large and the use of the device is affected is avoided.
Further, the peeling mechanism 200 comprises a first mounting frame 210, the top end of the inner wall of the processing box 110 is fixedly provided with the first mounting frame 210, one side of the first mounting frame 210 is movably provided with a second fixing shaft 211 through a bearing, one end of the second fixing shaft 211 far away from the bearing passes through an opening on the partition plate 132 and extends to the inside of the top frame 115, the outer side of the stirring shaft 117 inside the top frame 115 is sleeved with a second bevel gear 213, the outer side of the second fixing shaft 211 inside the top frame 115 is sleeved with a first bevel gear 212, the first bevel gear 212 is meshed with the second bevel gear 213, the outer side of the second fixing shaft 211 inside the processing box 110 is sleeved with a plurality of sleeving rings 214, the outer side of the sleeving rings 214 is uniformly and fixedly provided with a plurality of conical heads 215, the top end of the conical heads 215 passes through an opening on the top end of the processing box 110 and extends to the outer side of the processing box 110, when melon seeds enter the feeding plate 112, the feeding plate 112 is inclined, so that the material on the feeding plate 112 slides to the right, the first servo motor 116 is in a working state, so that the stirring shaft 117 is driven to rotate, the second bevel gear 213 is in a rotating state at the moment, so that the first bevel gear 212 meshed with the second bevel gear 213 is in a rotating state, and further the second fixing shaft 211 is driven to rotate, after the melon peels on the feeding plate 112 slide to a certain position, the thickness of the melon peels is higher than that of the melon seeds, so that the melon peels are in contact with the conical head 215 in the rotating state, so that the melon peels are punctured by the conical head 215 to be driven to rotate, after the sleeving ring 214 rotates to a certain extent, the conical head 215 is in contact with the blocking frame 219, at the moment, the blocking frame 219 applies resistance to the melon peels punctured by the conical head 215, so that the melon peels are blocked on the blocking frame 219, and the conical head 215 continuously works to remove subsequent, according to the mode, the melon peels remained in the melon seeds after the melon seeds are crushed can be removed, the manual melon peels removal during the feeding process of workers is not needed, and the processing flow of the workers for cleaning the melon seeds is simplified.
Further, a second mounting frame 216 is fixedly mounted on one side of the inner wall of the processing box 110, a baffle plate 218 is movably mounted on one side of the second mounting frame 216 through a rotating shaft, a first compression spring 217 is fixedly mounted at the top end of the baffle plate 218, one end of the first compression spring 217 far away from the baffle plate 218 is fixedly connected with one side of the inner wall of the processing box 110, a third fixing shaft 220 is movably mounted between the front surface and the rear surface of the processing box 110 through a bearing, a plurality of material receiving plates 221 are uniformly and fixedly mounted on the outer side of the third fixing shaft 220, melon seeds subjected to crushing processing are fed into the feeding port 111 during use, fall onto the material receiving plates 221 at the moment, and apply downward rotating force to the material receiving plates 221 due to gravity to drive the third fixing shaft 220 to rotate clockwise, and after the material receiving plate 221 bearing materials is turned over downwards by a certain extent, other material receiving plates 221 on, baffle 218 stops the flitch 221 this moment, after the material that bears on connecing the flitch 221 reaches a basis weight, because lever principle, the left side connects the flitch 221 to promote baffle 218 upwards to overturn this moment, and drive first compression spring 217 compression deformation, the flitch 221 that connects that bears the material this moment inclines down right because of gravity, will connect the material on the flitch 221 to empty to the feeding plate 112 on, can slow down the melon seed that gets into in processing box 110, reduce the motion potential energy of melon seed, avoid melon seed moving speed too fast, the influence takes place the condition that the melon skin got rid of, the stability of device during operation has been promoted.
Further, the anti-blocking mechanism 300 comprises a mounting rod 310, the inside of the collecting box 129 is provided with the mounting rod 310, two ends of the mounting rod 310 are respectively fixedly connected with the water discharging pipe 128 and one side of the inner wall of the water inlet pipe 130, the inside of the collecting box 129 is fixedly provided with a support plate 311, the number of the support plates 311 is two, the outer side of the mounting rod 310 of the support plate 311 far away from one side of the water inlet pipe 130 is fixedly provided with a second compression spring 313, the outer side of the mounting rod 310 of the support plate 311 far away from one side of the water inlet pipe 130 is movably provided with a second filter screen 312, one side of the second filter screen 312 is fixedly connected with the second compression spring 313, the top end and the bottom end of the collecting box 129 are fixedly provided with a group of communicating pipes 314, the number of each group of communicating pipes 314 is two, when melon seeds enter the inside of, because the continuous impact of rivers, the melon pulp passes the clearance between melon seed and the second filter screen 312 and continuously moves to the right, when water pressure is too big in the twinkling of an eye, lead to the second filter screen 312 to take place to block up, second filter screen 312 moves to the right, and drive second compression spring 313 compressive deformation, move to the right when second filter screen 312 moves to a certain position after, water source accessible communicating pipe 314 continuously carries to the right, can avoid melon seed and melon pulp to block up in the inside emergence of collecting box 129 through this kind of mode, the condition that influences the device and use takes place.
The working principle is as follows: when the device is used by a worker, the device is firstly externally connected with a power supply so as to provide electric support for the device, proportioned cleaning water is poured into the cleaning box 114 through the water feeding pipe 144, the device is started through the operation control panel 142, melon seeds subjected to crushing treatment are fed into the feeding hole 111 during use, the melon seeds and the like fall into the material receiving plate 221, downward rotating force is applied to the material receiving plate 221 due to gravity to drive the third fixed shaft 220 to rotate clockwise, after the material receiving plate 221 bearing materials turns downwards for a certain extent, other material receiving plates 221 on the third fixed shaft 220 are driven to be in contact with the baffle plate 218, the baffle plate 218 blocks the material receiving plate 221, when the materials bearing the material receiving plate 221 reach a certain weight, the left material receiving plate 221 pushes the baffle plate 218 to turn upwards due to the lever principle and drives the first compression spring 217 to be compressed and deformed, at this time, the material receiving plate 221 for bearing the material inclines downwards to the right due to gravity, and the material on the material receiving plate 221 is poured onto the feeding plate 112;
when the feeding plate 112 works, the feeding plate 112 is inclined, so that the material on the feeding plate 112 slides rightwards, the first servo motor 116 is in a working state, so that the stirring shaft 117 is driven to rotate, the second bevel gear 213 is in a rotating state, the first bevel gear 212 meshed with the second bevel gear 213 is in a rotating state, and further the second fixing shaft 211 is driven to rotate, after the melon peel on the feeding plate 112 slides to a certain position, the thickness of the melon peel is higher than that of the melon seed, so that the melon peel is in contact with the conical head 215 in the rotating state, so that the melon peel is punctured by the conical head 215 to drive the rotation, after the sleeving ring 214 rotates to a certain extent, the conical head 215 is in contact with the blocking frame 219, at this time, the blocking frame 219 applies resistance to the melon peel punctured by the conical head 215, so that the melon peel is blocked on the blocking frame 219, and the conical head 215 continuously works through the blocking frame 219 to;
during operation, the melon seeds continuously move rightwards on the feeding plate 112 and finally pass through the discharge port 113 to enter the cleaning box 114, because the stirring shaft 117 is in an operating state, the melon seeds are driven by the stirring shaft 117 to fully contact with a water source in the cleaning box 114 after entering the cleaning box 114, after the melon seeds are processed, the second servo motor 120 is started through the operation control panel 142, the screw rod 121 is driven to rotate when the second servo motor 120 works, the threaded sleeve 122 movably sleeved and mounted on the outer side of the screw rod 121 through threads moves upwards on the outer side of the screw rod 121 and drives the movable plate 123 to move upwards, because the space pressure in the processing box 110 at the bottom end of the movable plate 123 is smaller than the pressure in the cleaning box 114, at the moment, due to pressure difference, the water source mixed melon seeds in the cleaning box 114 push the sealing plate 135 through the through grooves on the second fixing plate 133, so that the sealing plate 135 moves away from, the extension spring 134 is driven to be stretched and deformed, at the moment, the sealing plate 135 does not block the through groove on the partition plate 132 any more, so that the water source in the cleaning box 114 enters the inside of the treatment box 110, when the moving plate 123 moves upwards, air on the upper part of the moving plate 123 is driven to be compressed, so that the air is blown out from the water feeding pipe 144, and at the moment, the high-speed gas discharged from the water feeding pipe 144 can assist in blowing the melon seeds adhered to the feeding plate 112 to the inside of the cleaning box 114 through the discharge port 113;
during operation, when the moving plate 123 moves upwards to a certain position, the pressures in the processing tank 110 and the cleaning tank 114 are the same, the extension spring 134 resets to drive the sealing plate 135 to seal the through groove on the partition 132, at this time, the second servo motor 120 is operated to work in reverse, the threaded sleeve 122 moves downwards, at this time, the moving plate 123 moves downwards, because the sealing plate 135 seals the partition 132 at this time, the water source mixed melon seeds at the bottom end of the moving plate 123 enter the inside of the collecting tank 129 through the drain pipe 128, the melon seeds contact the second filter screen 312, are blocked by the second filter screen 312 and are collected in the collecting tank 129, after the moving plate 123 continuously pressurizes water, the melon seeds in the water pass through the gap between the melon seeds and the second filter screen 312 and continue moving to move rightwards to enter the inside of the water inlet pipe 130, at this time, the water source passes through the opening on the third, so that the magnet sealing cover 141 is not adsorbed to the water inlet pipe 130 any more, and the water in the water inlet pipe 130 enters the inside of the cleaning tank 114 for recycling.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.