Non-ferrous metal ore pulp electrolytic device

文档序号:1811470 发布日期:2021-11-09 浏览:33次 中文

阅读说明:本技术 一种有色金属矿浆电解装置 (Non-ferrous metal ore pulp electrolytic device ) 是由 田红美 于 2021-08-13 设计创作,主要内容包括:本发明涉及矿浆电解技术领域,且公开了一种有色金属矿浆电解装置,包括底座、收纳桶和固定板,所述底座的顶部固定连接有支撑座,支撑座的顶部固定连接有蓄电柜,蓄电柜的一侧设有触控开关,触控开关与蓄电柜电性连接,所述收纳桶顶部固定连接有隔热环,隔热环的圆周内壁固定连接有多个连接杆,多个连接杆的另一端固定连接有隔热垫座,隔热垫座的顶部固定连接有电机,所述电机输出轴的一端固定连接有竖杆,竖杆的底端固定连接有固定座,竖杆的顶端套接有连接架,连接架的底部固定连接有固定杆。本发明可以使得金属矿浆与絮凝剂充分的混合,以便于矿浆内的杂质更好地凝结,从而方便矿浆中杂质的分离,提升电解效果。(The invention relates to the technical field of ore pulp electrolysis, and discloses a non-ferrous metal ore pulp electrolysis device which comprises a base, an accommodating barrel and a fixed plate, wherein the top of the base is fixedly connected with a supporting seat, the top of the supporting seat is fixedly connected with an electricity storage cabinet, one side of the electricity storage cabinet is provided with a touch switch, the touch switch is electrically connected with the electricity storage cabinet, the top of the accommodating barrel is fixedly connected with a heat insulation ring, the inner circumferential wall of the heat insulation ring is fixedly connected with a plurality of connecting rods, the other ends of the connecting rods are fixedly connected with a heat insulation cushion, the top of the heat insulation cushion is fixedly connected with a motor, one end of an output shaft of the motor is fixedly connected with a vertical rod, the bottom end of the vertical rod is fixedly connected with a fixed seat, the top end of the vertical rod is sleeved with a connecting frame, and the bottom of the connecting frame is fixedly connected with a fixed rod. The invention can fully mix the metal ore pulp and the flocculating agent so as to facilitate the better condensation of impurities in the ore pulp, thereby facilitating the separation of the impurities in the ore pulp and improving the electrolysis effect.)

1. The utility model provides a non ferrous metal ore pulp electrolytic device, includes base (1), containing bucket (4) and fixed plate (5), its characterized in that, the top fixedly connected with supporting seat (2) of base (1), the top fixedly connected with electricity storage cabinet (201) of supporting seat (2), one side of electricity storage cabinet (201) is equipped with touch switch (202), touch switch (202) and electricity storage cabinet (201) electric connection, containing bucket (4) top fixedly connected with heat insulating ring (401), the circumference inner wall fixedly connected with a plurality of connecting rods (6) of heat insulating ring (401), the other end fixedly connected with heat insulating base (601) of a plurality of connecting rods (6), the top fixedly connected with motor (10) of heat insulating base (601), the one end fixedly connected with montant (1001) of motor (10) output shaft, the bottom fixedly connected with fixing base (1002) of montant (1001), the top of montant (1001) has cup jointed link (1003), bottom fixedly connected with dead lever (1004) of link (1003), one side fixed connection of the other end of dead lever (1004) and fixing base (1002), one side outer wall integrated into one piece of thermal-insulated ring (401) has drain nozzle (402), two installation pieces (403) of one side inner wall fixedly connected with of thermal-insulated ring (401), the joint has filter screen (404) between two installation pieces (403), the sealed grafting in top of fixed plate (5) has liquid guide fill (501), installs insulating ring (502) in liquid guide fill (501), installs metal mesh (503) in insulating ring (502), metal mesh (503) and electric cabinet (201) electric connection that holds.

2. The non-ferrous metal ore pulp electrolysis device according to claim 1, characterized in that: one side of link (1003) is equipped with a plurality of vertical mouths (1005), and the top fixedly connected with of thermal-insulated base (601) separates heat exchanger (602).

3. The non-ferrous metal ore pulp electrolysis device according to claim 1, characterized in that: the top fixedly connected with two backup pads (3) of base (1), rotate between two backup pads (3) and be connected with loose axle (301), connecting strip (302) have all been cup jointed at the both ends of loose axle (301), one side fixedly connected with heat insulating board (303) of connecting strip (302), and storage bucket (4) scarf joint is in heat insulating board (303).

4. The non-ferrous metal pulp electrolysis device according to claim 3 wherein: the upper surface of base (1) rotates and is connected with electric putter (305), and the one end of electric putter (305) output shaft rotates and is connected with connection swash plate (304), connects the other end of swash plate (304) and the one end fixed connection of loose axle (301).

5. The non-ferrous metal ore pulp electrolysis device according to claim 1, characterized in that: the top fixedly connected with heater (405) of base (1), heater (405) are located the below of containing bucket (4).

6. The non-ferrous metal ore pulp electrolysis device according to claim 1, characterized in that: fixed plate (5) are fixed between two backup pads (3), and seat (701) are strengthened to one side fixedly connected with of backup pad (3), strengthen the opposite side of seat (701) and the bottom fixed connection of fixed plate (5), fixedly connected with limiting plate (7) between two backup pads (3).

7. The non-ferrous metal ore pulp electrolysis device according to claim 1, characterized in that: the top of base (1) is equipped with trapezoidal mould shell (8), and the bottom of trapezoidal mould shell (8) is rotated and is connected with bottom plate (801), a plurality of universal wheels (802) of bottom fixedly connected with of bottom plate (801), one side outer wall fixedly connected with curb plate (803) of trapezoidal mould shell (8), top fixedly connected with riser (9) of curb plate (803), one side of riser (9) is pegged graft and is had two guide bars (901), spring (902) have been cup jointed to one side of guide bar (901), other end fixedly connected with cardboard (903) of guide bar (901), the upper surface of curb plate (803) is equipped with spacing mouthful, and spacing mouthful is passed in cardboard (903), cardboard (903) and bottom plate (801) joint, one side fixedly connected with handle plate (904) of cardboard (903).

8. The non-ferrous metal pulp electrolysis device according to claim 7 wherein: the top of the side plate (803) is fixedly connected with a handrail frame (804), and one side of the handrail frame (804) is sleeved with an anti-slip sleeve.

9. The non-ferrous metal ore pulp electrolysis device according to claim 1, characterized in that: the top of the heat insulation ring (401) is fixed with a protective shell (12) through a bolt, the outer wall of one side of the electric storage cabinet (201) is fixed with a mounting plate (11) through a bolt, one side of the mounting plate (11) is fixed with an indicator light (1101) and a loudspeaker (1102) through a bolt, the outer wall of one side of the electric storage cabinet (201) is fixed with a display (1103) through a bolt, and the indicator light (1101), the loudspeaker (1102) and the display (1103) are electrically connected.

Technical Field

The invention relates to the technical field of ore pulp electrolysis, in particular to a non-ferrous metal ore pulp electrolysis device.

Background

The electrolysis is a process of leading current to pass through electrolyte solution or molten electrolyte and causing redox reaction on a cathode and an anode, an electrochemical cell can generate an electrolysis process when direct current voltage is applied, non-ferrous metal ore pulp needs to be subjected to electrolysis treatment when being treated, and non-ferrous metal ore pulp needs to be subjected to impurity removal treatment before electrolysis, but the traditional non-ferrous metal ore pulp electrolysis device is inconvenient for separating impurities and can not meet the requirement.

At present, most of the existing non-ferrous metal ore pulp electrolyzing devices have the following defects: at the in-process to non ferrous metal ore pulp electrolysis, impurity in the ore pulp can not conveniently be separated, leads to the electrolytic effect of non ferrous metal ore pulp not good, influences the product quality that non ferrous metal refined, to sum up, current non ferrous metal ore pulp electrolytic device still can not agree with actual need well mostly.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a non-ferrous metal ore pulp electrolysis device, which mainly solves the problems that impurities in ore pulp cannot be conveniently separated in the process of electrolyzing non-ferrous metal ore pulp, so that the electrolysis effect of the non-ferrous metal ore pulp is poor, and the quality of non-ferrous metal refined products is influenced.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme:

a non-ferrous metal ore pulp electrolysis device comprises a base, a containing barrel and a fixed plate, wherein the top of the base is fixedly connected with a supporting seat, the top of the supporting seat is fixedly connected with an electricity storage cabinet, one side of the electricity storage cabinet is provided with a touch switch, the touch switch is electrically connected with the electricity storage cabinet, the top of the containing barrel is fixedly connected with a heat insulation ring, the circumferential inner wall of the heat insulation ring is fixedly connected with a plurality of connecting rods, the other ends of the connecting rods are fixedly connected with a heat insulation base, the top of the heat insulation base is fixedly connected with a motor, one end of an output shaft of the motor is fixedly connected with a vertical rod, the bottom of the vertical rod is fixedly connected with a fixed seat, the top end of the vertical rod is sleeved with a connecting frame, the bottom of the connecting frame is fixedly connected with a fixed rod, the other end of the fixed rod is fixedly connected with one side of the fixed seat, the outer wall of one side of the heat insulation ring is integrally formed with a liquid outlet, and the inner wall of one side of the heat insulation ring is fixedly connected with two mounting blocks, the joint has the filter screen between two installation pieces, the sealed grafting in top of fixed plate has the drain fill, installs the insulating ring in the drain fill, installs the metal mesh in the insulating ring, metal mesh and electric power storage cabinet electric connection.

Furthermore, one side of link is equipped with a plurality of vertical mouths, and the top fixedly connected with of thermal-insulated base of a mattress insulates against heat the shell.

On the basis of the scheme, two supporting plates are fixedly connected to the top of the base, a movable shaft is rotatably connected between the two supporting plates, connecting strips are sleeved at two ends of the movable shaft, a heat insulation plate is fixedly connected to one side of each connecting strip, and the containing barrel is embedded in the heat insulation plate.

As a further scheme of the invention, the upper surface of the base is rotatably connected with an electric push rod, one end of an output shaft of the electric push rod is rotatably connected with a connecting inclined plate, and the other end of the connecting inclined plate is fixedly connected with one end of the movable shaft.

Furthermore, the top of base fixedly connected with heater, the heater is located the below of containing bucket.

On the basis of the scheme, the fixing plate is fixed between the two supporting plates, one side of each supporting plate is fixedly connected with a reinforcing seat, the other side of each reinforcing seat is fixedly connected with the bottom of the fixing plate, and a limiting plate is fixedly connected between the two supporting plates.

According to a further scheme of the invention, a ladder-shaped mold shell is arranged at the top of the base, a bottom plate is rotatably connected to the bottom of the ladder-shaped mold shell, a plurality of universal wheels are fixedly connected to the bottom of the bottom plate, a side plate is fixedly connected to the outer wall of one side of the ladder-shaped mold shell, a vertical plate is fixedly connected to the top of the side plate, two guide rods are inserted into one side of the vertical plate, springs are sleeved on one sides of the guide rods, a clamping plate is fixedly connected to the other end of each guide rod, a limiting opening is formed in the upper surface of the side plate, the clamping plate penetrates through the limiting opening, the clamping plate is clamped with the bottom plate, and a handle plate is fixedly connected to one side of the clamping plate.

Furthermore, the top of the side plate is fixedly connected with a handrail frame, and one side of the handrail frame is sleeved with an anti-slip sleeve.

On the basis of the scheme, the top of the heat insulation ring is further provided with a protective shell through bolt fixing, one side outer wall of the electricity storage cabinet is provided with a mounting plate through bolt fixing, one side of the mounting plate is provided with an indicator light and a loudspeaker through bolt fixing, one side outer wall of the electricity storage cabinet is provided with a display, and the indicator light, the loudspeaker and the display are electrically connected through bolt fixing.

(III) advantageous effects

Compared with the prior art, the invention provides a non-ferrous metal ore pulp electrolysis device, which has the following beneficial effects:

1. according to the invention, the motor drives the connecting frame, the fixing rod and the fixing seat to rotate simultaneously, so that metal ore pulp can be stirred in a layered manner, the metal ore pulp and the flocculating agent are fully mixed, impurities in the ore pulp are better condensed, the separation of the impurities in the ore pulp is facilitated, and the electrolysis effect is improved.

2. According to the invention, the connection inclined plate is driven to rotate by stretching the electric push rod, so that the movable shaft can be driven to rotate, the connecting strip is driven to rotate simultaneously, the storage barrel is inclined, ore pulp flows into the liquid guide hopper from the liquid outlet nozzle for electrolysis, and impurities are filtered out by the filter screen, so that the impurities in the ore pulp are separated, and the operation is simple, convenient and fast.

3. According to the invention, the ladder-shaped die shell is turned over, then the handle plate is pulled to separate the clamping plate from the bottom plate, and then the bottom plate is opened and knocked downwards, so that the metal block is conveniently demoulded.

4. According to the invention, the arrangement of the protective shell can prevent the metal ore pulp from being splashed to damage the device, and meanwhile, the metal ore pulp can be prevented from splashing to scald workers, so that the health of the workers is protected.

Drawings

FIG. 1 is a schematic top view of an embodiment 1 of the non-ferrous metal ore pulp electrolyzing apparatus;

FIG. 2 is a schematic side view of an embodiment 1 of the apparatus for electrolyzing a non-ferrous metal ore slurry according to the present invention;

FIG. 3 is an enlarged schematic view of the position A of the non-ferrous metal ore pulp electrolyzer in accordance with the present invention in the embodiment 1;

FIG. 4 is a schematic bottom view of an embodiment 1 of the apparatus for electrolyzing non-ferrous metal ore slurry according to the present invention;

FIG. 5 is a schematic partial perspective view of an apparatus for electrolyzing non-ferrous metal ore slurry 1 according to the present invention;

FIG. 6 is a schematic view of a partial bottom view of an embodiment 1 of the apparatus for electrolyzing non-ferrous metal ore slurry according to the present invention;

FIG. 7 is a schematic view of a partial cross-sectional structure of an embodiment 1 of the nonferrous metal ore pulp electrolyzing apparatus according to the present invention;

FIG. 8 is a schematic perspective view of an embodiment 1 of the apparatus for electrolyzing non-ferrous metal ore pulp according to the present invention;

fig. 9 is a schematic perspective view of a non-ferrous metal ore pulp electrolyzing apparatus in accordance with embodiment 2 of the present invention.

In the figure: 1. a base; 2. a supporting seat; 201. an electricity storage cabinet; 202. a touch switch; 3. a support plate; 301. a movable shaft; 302. a connecting strip; 303. a heat insulation plate; 304. connecting an inclined plate; 305. an electric push rod; 4. a storage barrel; 401. a heat insulating ring; 402. a liquid outlet nozzle; 403. mounting blocks; 404. a filter screen; 405. a heater; 5. a fixing plate; 501. a liquid guide hopper; 502. an insulating ring; 503. a metal mesh; 6. a connecting rod; 601. a heat insulating pad seat; 602. a thermally insulating shell; 7. a limiting plate; 701. a reinforcement base; 8. a stepped mold shell; 801. a base plate; 802. a universal wheel; 803. a side plate; 804. a handrail frame; 9. a vertical plate; 901. a guide bar; 902. a spring; 903. clamping a plate; 904. a handle plate; 10. a motor; 1001. a vertical rod; 1002. a fixed seat; 1003. a connecting frame; 1004. fixing the rod; 1005. a vertical port; 11. mounting a plate; 1101. an indicator light; 1102. a speaker; 1103. a display; 12. and (4) a protective shell.

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.

Example 1

Referring to fig. 1-8, a non-ferrous metal ore pulp electrolysis device comprises a base 1, a receiving barrel 4 and a fixing plate 5, wherein a supporting seat 2 is fixed on the top of the base 1 through bolts, an electricity storage cabinet 201 is fixed on the top of the supporting seat 2 through bolts, the electricity storage cabinet 201 is used for storing electric energy, a touch switch 202 is arranged on one side of the electricity storage cabinet 201, the touch switch 202 is electrically connected with the electricity storage cabinet 201, a heat insulation ring 401 is welded on the top of the receiving barrel 4, a plurality of connecting rods 6 are welded on the circumferential inner wall of the heat insulation ring 401, a heat insulation base 601 is welded on the other end of the plurality of connecting rods 6, a motor 10 is fixed on the top of the heat insulation base 601 through bolts, a vertical rod 1001 is connected to one end of an output shaft of the motor 10, a fixing seat 1002 is fixed on the bottom end of the vertical rod 1001 through bolts, a connecting frame 1003 is sleeved on the top end of the vertical rod 1001, a fixing rod 1004 is fixed on the bottom of the connecting frame 1003 through bolts, and the other end of the fixing rod 1004 is fixedly connected with one side of the fixing seat 1002, motor 10 drives link 1003 and rotates, thereby it stirs the mixture to drive dead lever 1004 and fixing base 1002 to rotate together to metal ore pulp, thereby make the better condensation of impurity in the metal ore pulp together, thereby be convenient for the separation of later stage impurity, one side outer wall integrated into one piece of thermal-insulated ring 401 has drain tap 402, one side inner wall of thermal-insulated ring 401 has two installation pieces 403 through the bolt fastening, the joint has filter screen 404 between two installation pieces 403, the sealed grafting in top of fixed plate 5 has drain bucket 501, install insulating ring 502 in the drain bucket 501, install metal mesh 503 in the insulating ring 502, metal mesh 503 and electric power cabinet 201 electric connection, metal ore pulp flows into the drain bucket 501 from drain tap 402 and carries out the electrolysis, and impurity is filtered out by filter screen 404 and stays in storage barrel 4.

One side of the connecting frame 1003 is provided with a plurality of vertical openings 1005, the top of the heat insulation base 601 is fixed with a heat insulation shell 602 through bolts, the heat insulation shell 602 can prevent the motor 10 from being damaged by burning, the top of the base 1 is fixed with two supporting plates 3 through bolts, a movable shaft 301 is rotatably connected between the two supporting plates 3, two ends of the movable shaft 301 are sleeved with connecting strips 302, one side of each connecting strip 302 is fixed with a heat insulation plate 303 through bolts, the containing barrel 4 is embedded in the heat insulation plate 303, the upper surface of the base 1 is rotatably connected with an electric push rod 305, one end of an output shaft of the electric push rod 305 is rotatably connected with a connecting inclined plate 304, the other end of the connecting inclined plate 304 is fixedly connected with one end of the movable shaft 301, the connecting inclined plate 304 is rotated under the driving of the electric push rod 305, thereby the movable shaft 301 is rotated, further, the connecting strips 302 and the heat insulation plate 303 are rotated together, thereby the containing barrel 4 is tilted, the top of base 1 is fixed with heater 405 through the bolt, and heater 405 is located the below of containing bucket 4, and heater 405 keeps warm to containing bucket 4, prevents the solidification of metal ore pulp.

The fixing plate 5 is fixed between the two supporting plates 3, one side of each supporting plate 3 is fixedly provided with a reinforcing seat 701 through a bolt, the fixing of the fixing plate 5 is reinforced, the other side of the reinforcing seat 701 is fixedly connected with the bottom of the fixing plate 5, a limiting plate 7 is fixed between the two supporting plates 3 through a bolt, the top of the base 1 is provided with a ladder-shaped mold shell 8, the limiting plate 7 limits the movement of the ladder-shaped mold shell 8, the bottom of the ladder-shaped mold shell 8 is rotatably connected with a bottom plate 801, the bottom of the bottom plate 801 is fixedly provided with a plurality of universal wheels 802 through bolts, the outer wall of one side of the ladder-shaped mold shell 8 is fixedly provided with a side plate 803 through a bolt, the top of the side plate 803 is fixedly provided with a vertical plate 9 through a bolt, one side of the vertical plate 9 is inserted with two guide rods 901, one side of each guide rod 901 is sleeved with a spring 902, the other end of each guide rod 901 is fixedly provided with a clamping plate 903 through a bolt, the upper surface of each side plate 803 is provided with a limiting opening, cardboard 903 passes spacing mouthful, cardboard 903 and bottom plate 801 joint, one side of cardboard 903 is passed through the bolt fastening and is had handle board 904, it comes to overturn trapezoidal mould shell 8, then, pull handle board 904 and make cardboard 903 outside to move, make cardboard 903 and bottom plate 801 separation under the guide effect of guide bar 901, open bottom plate 801 again and strike the metal block downwards, the metal block separates with trapezoidal mould shell 8, the top of curb plate 803 is passed through the bolt fastening and is had handrail frame 804, thereby be convenient for the removal of trapezoidal mould shell 8, the antiskid cover has been cup jointed to one side of handrail frame 804.

The working principle of the embodiment is as follows: when the device is used, firstly, metal ore pulp is poured into the containing barrel 4, the heater 405 is started to keep the temperature of the containing barrel 4, so as to prevent the metal ore pulp from solidifying, then a flocculating agent is put into the metal ore pulp, the motor 10 is started, the motor 10 drives the connecting frame 1003 to rotate, so as to drive the fixing rod 1004 and the fixing seat 1002 to rotate together to stir and mix the metal ore pulp, so that impurities in the metal ore pulp are better condensed together, then the electric push rod 305 is started, the inclined plate 304 is connected to rotate under the driving of the electric push rod 305, so as to drive the movable shaft 301 to rotate, so that the connecting strip 302 and the heat insulation plate 303 rotate together, so that the containing barrel 4 is poured, the metal ore pulp flows into the liquid guide hopper 501 from the liquid outlet 402 to be electrolyzed, and the impurities are filtered by the filter screen 404 to be left in the containing barrel 4, so as to realize the separation of the impurities in the metal ore pulp, after the metal pulp passes through the electrolysis of metal mesh 503 in leading liquid fill 501, fall in trapezoidal mould shell 8 along the inside of leading liquid fill 501, after the metal pulp cooling shaping in trapezoidal mould shell 8, turn over trapezoidal mould shell 8, then, pull handle board 904 and make cardboard 903 outside lateral shifting, make cardboard 903 and bottom plate 801 separation under the guide effect of guide bar 901, reopen bottom plate 801 and strike the metal block downwards, the metal block separates with trapezoidal mould shell 8.

Example 2

Referring to fig. 9, a non-ferrous metal ore pulp electrolytic device, there is protecting sheathing 12 including the top of heat insulating ring 401 through the bolt fastening, protecting sheathing 12 prevents to take place the phenomenon of spilling when empting the metal ore pulp, in order to avoid scalding bad equipment and scalding the staff, one side outer wall of electricity storage cabinet 201 has mounting panel 11 through the bolt fastening, one side of mounting panel 11 has pilot lamp 1101 and speaker 1102 through the bolt fastening, pilot lamp 1101 and speaker 1102 are convenient for the understanding of electricity storage cabinet 201 electric quantity, one side outer wall of electricity storage cabinet 201 has display 1103 through the bolt fastening, show electric quantity and output's power on the display 1103, pilot lamp 1101, speaker 1102 and display 1103 electric connection.

The working principle of the embodiment is as follows: during the use, the change of electric storage cabinet 201 electric quantity can be known clearly to the change of pilot lamp 1101 color, and when electric storage cabinet 201 electric quantity was not enough, speaker 1102 can indicate, shows the power of electric quantity and output on the display 1103, and protective housing 12 prevents to take place the phenomenon of spilling when empting metal ore pulp to the bad equipment of scalding of non-ironing and scald staff.

The electrical components presented in the document are all electrically connected with an external master controller and 220V mains, and the master controller can be a conventional known device controlled by a computer or the like.

In the description herein, it is to be noted that, unless expressly stated or limited otherwise, the terms "connected" and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection may be mechanical or electrical, and may be direct or indirect via an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

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

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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