CN206287557U - Forage briquetting forming machine - Google Patents

Forage briquetting forming machine Download PDF

Info

Publication number
CN206287557U
CN206287557U CN201621170025.7U CN201621170025U CN206287557U CN 206287557 U CN206287557 U CN 206287557U CN 201621170025 U CN201621170025 U CN 201621170025U CN 206287557 U CN206287557 U CN 206287557U
Authority
CN
China
Prior art keywords
forage
room
compression
stage
forming machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201621170025.7U
Other languages
Chinese (zh)
Inventor
谢伟
吴明亮
易鹏
向伟
张贝贝
王加跃
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Agricultural University
Original Assignee
Hunan Agricultural University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hunan Agricultural University filed Critical Hunan Agricultural University
Priority to CN201621170025.7U priority Critical patent/CN206287557U/en
Application granted granted Critical
Publication of CN206287557U publication Critical patent/CN206287557U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)

Abstract

The utility model discloses a kind of forage briquetting forming machine, including frame, one stage of compression room is installed in frame, two-stage compression room, forming room and feed space, one stage of compression room connects with two-stage compression room, two-stage compression room connects with forming room, one stage of compression room is provided with charging aperture, forming room is provided with discharging opening, feed space is connected with charging aperture, also include the first compression mechanism for the forage in one stage of compression room to be pressed into two-stage compression room, for by second compression mechanism and discharging mechanism for the forage in forming room to be released from discharging opening of the forage press-in forming room in two-stage compression room.The forage briquetting forming machine has the advantages that simple and compact for structure, Forming Quality is good, efficiency high.

Description

Forage briquetting forming machine
Technical field
The utility model is related to compound stalk forming equipment technical field, and in particular to a kind of forage briquetting forming machine.
Background technology
At present because the change of environment faces new problem, southern rice heavy metals exceeding standard phenomenon is very serious, gives people Life and health bring greatly threat, researcher has found that rice straw carries substantial amounts of heavy metal in itself(Such as cadmium Deng), therefore it is one of effective solution that rice straw is removed from field.Can be processed into for stalk by stalk block making machine Type fuel, because its small volume, density increase, can substantially improve combustion characteristics, can effectively replace coal, natural gas and fuel oil to turn into business Product commodity.
Existing stalk block making machine is divided into three kinds, respectively spiral squeezing type, piston punching type and pressure roller compaction type.Wherein, Spiral squeezing type stalk block making machine is to be advanced using screw rod transmission and extruding biomass, and the product for obtaining is column, this kind of stalk The problems such as there is profiled part serious wear, short life, high energy consumption in cuber.Piston punching type stalk block making machine is to rely on piston Reciprocating motion realize that it is divided into the compression of flywheel piston again and hydraulic piston compresses two kinds of forms, but flywheel piston sets Standby huge, vibrations are strong and noise is violent, and the hydraulic machinery stroke of hydraulic piston is big, and productivity ratio is low.Pressure roller compaction type stalk Cuber is divided into ring mould and flat-die, and using pressure roller and pressure roller shaft or ring model extrusion, its shaped article is bulk, using piston Hydraulic piston compression in punching press, with all operations of programme-control, simple to operate, efficiency high.
Utility model content
The technical problems to be solved in the utility model is to overcome the shortcomings of that prior art is present, there is provided a kind of simple structure is tight Gather, Forming Quality is good, efficiency high forage briquetting forming machine.
In order to solve the above technical problems, the utility model uses following technical scheme:
A kind of forage briquetting forming machine, including frame, be provided with the frame one stage of compression room, two-stage compression room, into Type room and feed space, the one stage of compression room connect with two-stage compression room, and the two-stage compression room connects with forming room, and described one Level discharge chambe is provided with charging aperture, and the forming room is provided with discharging opening, and the feed space is connected with the charging aperture, also including being used for By the first compression mechanism of the forage press-in two-stage compression room in one stage of compression room, for the forage in two-stage compression room to be pressed into Second compression mechanism and the discharging mechanism for the forage in forming room to be released from discharging opening of forming room.
Above-mentioned forage briquetting forming machine, it is preferred that the direction of the first compression mechanism compression forage and the second compression The direction of mechanism's compression forage is mutually perpendicular to, and the discharging mechanism releases direction and the second compression mechanism compression forage of forage Direction is mutually perpendicular to.
Above-mentioned forage briquetting forming machine, it is preferred that the charging aperture is located at the top of one stage of compression room, the feed space Bottom positioned at the top of one stage of compression room, and feed space communicates with charging aperture.
Above-mentioned forage briquetting forming machine, it is preferred that the feed space is provided with blocking rotary type level detector.
Above-mentioned forage briquetting forming machine, it is preferred that the volume of the one stage of compression room is the 4 of the volume of two-stage compression room More than times.
Above-mentioned forage briquetting forming machine, it is preferred that the one stage of compression room and two-stage compression room are interconnected and constitute one Individual overall regular hexahedron chamber, the two-stage compression room and forming room are interconnected and constitute a regular hexahedron chamber for entirety Room.
Above-mentioned forage briquetting forming machine, it is preferred that first compression mechanism includes first piston and and first piston The first connected telescopic drive part, second compression mechanism includes second piston and the second flexible drive being connected with second piston Moving part, the discharging mechanism includes push pedal and the 3rd telescopic drive part being connected with push pedal.
Above-mentioned forage briquetting forming machine, it is preferred that the first piston is connected with and seals charging aperture when forage is compressed The baffle plate for closing.
Above-mentioned forage briquetting forming machine, it is preferred that the first telescopic drive part, the second telescopic drive part and the 3rd are stretched Contracting actuator is telescopic oil cylinder, and each telescopic oil cylinder is mounted on travel switch, and the forage briquetting forming machine also includes being used for Drive the hydraulic system and switch board of the first telescopic drive part, the second telescopic drive part and the 3rd telescopic drive part expanding-contracting action.
Compared with prior art, the utility model has the advantage of:Forage briquetting forming machine of the present utility model is to grass During material compound stalk forming, first pass through the first compression mechanism carries out first time pressure by the forage press-in two-stage compression room in one stage of compression room Contracting, then the material press-in forming room in two-stage compression room is carried out by the second second compression by the second compression mechanism, so as to obtain into The forage block of type.By the way of compressing at twice, the compression travel of the first compression mechanism and the second compression mechanism can be all provided with Put smaller, make the structure of forage briquetting forming machine compacter, reduce the space of occupancy.The forage briquetting forming machine also has Have the advantages that Forming Quality is good, efficiency high.
Brief description of the drawings
Fig. 1 is the dimensional structure diagram of forage briquetting forming machine.
Fig. 2 is forage briquetting forming machine main cross section structure diagram.
Fig. 3 is the overlooking the structure diagram of forage briquetting forming machine.
Fig. 4 is the backsight structural representation of forage briquetting forming machine.
Fig. 5 is the side structure schematic view of forage briquetting forming machine.
Marginal data:
1st, frame;2nd, one stage of compression room;21st, charging aperture;3rd, two-stage compression room;4th, forming room;41st, discharging opening;5th, feed Room;6th, the first compression mechanism;61st, first piston;62nd, the first telescopic drive part;63rd, baffle plate;7th, the second compression mechanism;71st, Two pistons;72nd, the second telescopic drive part;8th, discharging mechanism;81st, push pedal;82nd, the 3rd telescopic drive part;9th, switch board;101st, bottom Disk;102nd, control valve group;103rd, fuel tank;104th, motor.
Specific embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
As shown in Figures 1 to 5, the forage briquetting forming machine of the present embodiment, including frame 1, is provided with one-level pressure in frame 1 Contracting room 2, two-stage compression room 3, forming room 4 and feed space 5, one stage of compression room 2 connect with two-stage compression room 3, two-stage compression room 3 with Forming room 4 connects, and one stage of compression room 2 is provided with charging aperture 21, and forming room 4 is provided with discharging opening 41, and feed space 5 connects with charging aperture 21 It is logical, also including for by the first compression mechanism 6 of the forage press-in two-stage compression room 3 in one stage of compression room 2, for two grades to be pressed Forage in contracting room 3 is pressed into the second compression mechanism 7 of forming room 4 and for the forage in forming room 4 to be pushed away from discharging opening 41 The discharging mechanism 8 for going out.
Forage briquetting forming machine first passes through the first compression mechanism 6 by one stage of compression room 2 when to forage compound stalk forming Forage press-in two-stage compression room 3 carries out the first second compression, then by the second compression mechanism 7 by the material pressure in two-stage compression room 3 Entering forming room 4 carries out the second second compression, so as to the forage block being molded.By the way of compressing at twice, can be by the first pressure The compression travel of the compression mechanism 7 of contracting mechanism 6 and second is respectively provided with smaller, makes the structure of forage briquetting forming machine compacter, Reduce the space of occupancy.The forage briquetting forming machine also has the advantages that Forming Quality is good, efficiency high.
The utility model belongs to the mode of hydraulic piston compression in piston punching type, using tri- orthogonal sides of XYZ To being compressed respectively and extruding, using more than two-stage mutually perpendicular compression method, be compressed step by step, reduce volume into Block, can reduce the shear action between stalk, there is close adhesion between making stalk, with certain consolidation.Wherein, the second pressure Contracting mechanism 7 pushes away the grass block side flanging in two-stage compression room 3, and until grass block is clamped in, to be connected with two-stage compression room 3 be one In the forming room 4 of body, under the clamping of the certain force of the second compression mechanism 7, forage cane distribution order without arranging again May, therefore in forming room 4, after forage is compressed, its cane can only do the warpage in other directions, so as to cause snake spring shape forever Deformation long, forms the grass block with certain consolidation.
In the present embodiment, the direction phase of forage is compressed in the direction of the compression forage of the first compression mechanism 6 with the second compression mechanism 7 Mutually vertical, discharging mechanism 8 releases the direction of forage and the direction of the compression forage of the second compression mechanism 7 is mutually perpendicular to.Specifically, the The direction of the compression forage of one compression mechanism 6 is horizontal direction, and the direction of the compression forage of the second compression mechanism 7 is side straight down To the direction that discharging mechanism 8 releases forage is horizontal direction, and discharging mechanism 8 releases direction and first compression mechanism 6 of forage The direction that forage is compressed in the direction and the second compression mechanism 7 for compressing forage is vertical.
In the present embodiment, charging aperture 21 is located at the top of one stage of compression room 2, and feed space 5 is located at the upper of one stage of compression room 2 Side, and the bottom of feed space 5 communicates with charging aperture 21, the forage in feed space 5 can be dropped in one stage of compression room 2, feeding side Just it is quick.
In the present embodiment, feed space 5 is provided with blocking rotary type level detector, and the material position of feed space 5 is measured by blocking rotary type level detector, It is easy to the feed quantity for coordinating control device control forage and the automatic work for realizing forage briquetting forming machine, the blocking rotary type material position Device is prior art.When artificial operation is compressed forage, blocking rotary type level detector can not be installed.
In the present embodiment, the volume of one stage of compression room 2 is more than 4 times of the volume of two-stage compression room 3, makes one stage of compression room Its volume is reduced to a quarter or so after forage in 2 is pressed into two-stage compression room 3, and this compression ratio makes the density of forage Can reach 0.5g/Cm3More than, at this moment forage cane is in itself outside internal voids, and the gap between cane is minimum, makes forage without again The possibility of arrangement, so twines the best results of connection.
In the present embodiment, the first compression mechanism 6 includes first piston 61 and the first flexible drive being connected with first piston 61 Moving part 62, the second compression mechanism 7 includes second piston 71 and the second telescopic drive part 72 being connected with second piston 71, discharging machine Structure 8 includes push pedal 81 and the 3rd telescopic drive part 82 being connected with push pedal 81.The one stage of compression room 2, two-stage compression of the present embodiment The cross section of room 3 and forming room 4 is square, and the cross section of first piston 61 is to be coincide with the cross section of one stage of compression room 2 Square, second piston 71 is square with what the cross section of two-stage compression room 3 coincide, and the cross section of push pedal 81 is and forming room 4 It is square that cross section coincide.One stage of compression room 2 and two-stage compression room 3 are interconnected and constitute a regular hexahedron chamber for entirety, Namely one stage of compression room 2 and two-stage compression room 3 are perpendicular to the shapes and sizes of the arbitrary section of the compression direction of the first compression mechanism 6 It is identical;Two-stage compression room 3 and forming room 4 are interconnected and constitute a regular hexahedron chamber for entirety, namely the He of two-stage compression room 3 Forming room 4 is identical perpendicular to the shapes and sizes of the arbitrary section of the compression direction of the second compression mechanism 7.
In the present embodiment, the height of two-stage compression room 3 is more than 3.5 times of width, and the two-stage compression room 3 of this kind of form makes Forage arrangement is reasonable, can reach the effect that forage cane closely twines connection.The height of two-stage compression room 3 is and one stage of compression room 2 Height be substantially uniform, it is contemplated that the stroke of the density requirements that finally compress and effective piston when meeting pressure, by two The ratio between Gao Yukuan of level discharge chambe 3 is set to 3.5 or so.
In the present embodiment, first piston 61 is provided with the baffle plate 63 for closing charging aperture 21 when forage is compressed, baffle plate 63 Moved with first piston 61, during first piston 61 advances compression forage, baffle plate 63 progressively closes charging aperture 21, in case Only the forage in feed space 5 enters one stage of compression room 2, and during first piston 61 is retreated, baffle plate 63 progressively opens charging Mouth 21, makes the forage in feed space 5 to enter one stage of compression room 2, namely first piston 61 while retreating, material is while fall into one Level discharge chambe 2.
In the present embodiment, the first telescopic drive part 62, the second telescopic drive part 72 and the 3rd telescopic drive part 82 are and stretch Contracting oil cylinder, each telescopic oil cylinder is mounted on travel switch, and forage briquetting forming machine is also included for driving the first telescopic drive part 62nd, the hydraulic system and switch board 9 of the second telescopic drive part 72 and the expanding-contracting action of the 3rd telescopic drive part 82.
Hydraulic system includes the control valve group 102, fuel tank 103, motor 104 and the hydraulic pump that are arranged on a chassis 101, electricity The output shaft of machine 104 is connected to drive hydraulic pump works, control valve group 102 to pass through oil pipe and hydraulic pump with the input shaft of hydraulic pump It is connected with each telescopic oil cylinder, control valve group 102 is connected by control line with switch board 9.
Switch board 9 be provided with the rotation of automatic charging button, pump startup button, oil cylinder stop button, hand adaptive switched knob and Control the control button of the first telescopic drive part 62, the second telescopic drive part 72 and the forward-reverse of the 3rd telescopic drive part 82.It is whole The all program pushbuttons of machine are combined in switch board 9, simple to operate, can realize that artificial loading and automatic charging measure two kinds of moulds Formula, beneficial to the production automation and efficiency.
Because in one stage of compression room 2, first piston 61 makes to compress the dry rice straw that nature is piled up under certain speed, The orientation of its cane axis has spy mainly vertical with compression direction namely almost parallel with the working face of first piston 61 Point, therefore the compression travel of first piston 61 is designed as the height of the feeding forage more than needed for.
The forage briquetting forming machine of the present embodiment is divided into manually and automatically two kinds of mode of operations, during manual work pattern, will The adaptive switched knob of hand on switch board 9 is rotated to manual mode, and automatic charging button need not start, manually by ready rice Stalk pours into feed space 5, presses the pump startup button on switch board 9, and whole hydraulic system is started working, before pressing oil cylinder afterwards Enter button, the first telescopic drive part 62 drives first piston 61 to advance, until corresponding travel switch is touched, the first flexible drive The stopping of moving part 62 is acted, and completes the first second compression of rice straw, and rice straw volume-diminished simultaneously enters two-stage compression room 3 and forming room 4.Then press briquetting and decline button, the second telescopic drive part 72 drives second piston 71 to decline, until touching corresponding row Cheng Kaiguan, the stopping of the second telescopic drive part 72 action completes the second second compression of rice straw, and rice straw volume further reduces simultaneously It is pressed into forming room 4.Press again and push away bag forwarding button, the 3rd telescopic drive part 82 drives push pedal 81 to advance, and forming blocks are released Forming room 4, discharges through discharging opening 41, until touching travel switch, the stopping of the 3rd telescopic drive part 82 action completes briquetting mistake Journey, finally presses the corresponding button and returns successively, successively retreats push pedal 81, second piston 71 rises, first piston 61 is retreated, and is Next task is prepared.In whole process, in case of emergency, oil cylinder stop button is pressed, you can realize hydraulic cylinder The pause of work, rotary oil cylinder stop button can continue normal work(As pressure reaches hydraulic cylinder limiting value, hydraulic cylinder can not Piston is driven, this button need to be just pressed), the motion of hydraulic cylinder is all the intermittent movement being engaged according to setting program, is only gone up The hydraulic cylinder travel of one-level is completed, and the hydraulic cylinder of next stage could start.
During automatic operation mode, the adaptive switched knob of hand is rotated to auto state, start automatic charging button, press control Pump startup button on cabinet 9, blocking rotary type level detector is started working, continual in feed space 5 using uninterrupted feed mechanism Feeding, when material reaches blocking rotary type level detector rotating vane, blade stops the rotation, now controller in triggering switch board 9 Program, controls forage briquetting forming machine according to the sequential compression forage of above-mentioned manual work pattern.First telescopic drive part 62, The flexible stroke and sequence of movement of two telescopic drive parts 72 and the 3rd telescopic drive part 82 match somebody with somebody hop controller and control by travel switch Valve group processed 102 is controlled.
The above is only preferred embodiment of the present utility model, and protection domain of the present utility model is not limited merely to Above-described embodiment.To those of ordinary skill in the art, the gained under the premise of the utility model technology design is not departed from To modifications and variations also should be regarded as protection domain of the present utility model.

Claims (9)

1. a kind of forage briquetting forming machine, it is characterised in that:Including frame(1), the frame(1)On one stage of compression room is installed (2), two-stage compression room(3), forming room(4)And feed space(5), the one stage of compression room(2)With two-stage compression room(3)Connection, The two-stage compression room(3)With forming room(4)Connection, the one stage of compression room(2)It is provided with charging aperture(21), the forming room (4)It is provided with discharging opening(41), the feed space(5)With the charging aperture(21)Connection, also including for by one stage of compression room(2) In forage press-in two-stage compression room(3)The first compression mechanism(6), for by two-stage compression room(3)In forage be pressed into Type room(4)The second compression mechanism(7)And for by forming room(4)In forage from discharging opening(41)The discharging mechanism of release (8).
2. forage briquetting forming machine according to claim 1, it is characterised in that:First compression mechanism(6)Compression grass The direction of material and the second compression mechanism(7)The direction for compressing forage is mutually perpendicular to, the discharging mechanism(8)Release the direction of forage With the second compression mechanism(7)The direction for compressing forage is mutually perpendicular to.
3. forage briquetting forming machine according to claim 1, it is characterised in that:The charging aperture(21)Positioned at one stage of compression Room(2)Top, the feed space(5)Positioned at one stage of compression room(2)Top, and feed space(5)Bottom and charging aperture (21)Communicate.
4. forage briquetting forming machine according to claim 1, it is characterised in that:The feed space(5)Blocking rotary type is installed Level detector.
5. forage briquetting forming machine according to claim 1, it is characterised in that:The one stage of compression room(2)Volume be Two-stage compression room(3)More than 4 times of volume.
6. forage briquetting forming machine according to claim 1, it is characterised in that:The one stage of compression room(2)With two grades of pressures Contracting room(3)It is interconnected and constitutes a regular hexahedron chamber for entirety, the two-stage compression room(3)And forming room(4)Mutually interconnect It is logical to constitute a regular hexahedron chamber for entirety.
7. forage briquetting forming machine according to any one of claim 1 to 6, it is characterised in that:First compressor Structure(6)Including first piston(61)And with first piston(61)The first connected telescopic drive part(62), second compressor Structure(7)Including second piston(71)And with second piston(71)The second connected telescopic drive part(72), the discharging mechanism(8) Including push pedal(81)And with push pedal(81)The 3rd connected telescopic drive part(82).
8. forage briquetting forming machine according to claim 7, it is characterised in that:The first piston(61)It is connected with pressure By charging aperture during contracting forage(21)The baffle plate of closing(63).
9. forage briquetting forming machine according to claim 7, it is characterised in that:The first telescopic drive part(62), Two telescopic drive parts(72)With the 3rd telescopic drive part(82)Telescopic oil cylinder is, each telescopic oil cylinder is mounted on travel switch, The forage briquetting forming machine is also included for driving the first telescopic drive part(62), the second telescopic drive part(72)Stretched with the 3rd Contracting actuator(82)The hydraulic system and switch board of expanding-contracting action(9).
CN201621170025.7U 2016-11-02 2016-11-02 Forage briquetting forming machine Expired - Fee Related CN206287557U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201621170025.7U CN206287557U (en) 2016-11-02 2016-11-02 Forage briquetting forming machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201621170025.7U CN206287557U (en) 2016-11-02 2016-11-02 Forage briquetting forming machine

Publications (1)

Publication Number Publication Date
CN206287557U true CN206287557U (en) 2017-06-30

Family

ID=59099111

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201621170025.7U Expired - Fee Related CN206287557U (en) 2016-11-02 2016-11-02 Forage briquetting forming machine

Country Status (1)

Country Link
CN (1) CN206287557U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106427024A (en) * 2016-11-02 2017-02-22 湖南农业大学 Forage briquetting machine
US10933603B2 (en) 2019-06-12 2021-03-02 Ernest J. Sweetland, Iii Device for forming bio-logs and method therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106427024A (en) * 2016-11-02 2017-02-22 湖南农业大学 Forage briquetting machine
US10933603B2 (en) 2019-06-12 2021-03-02 Ernest J. Sweetland, Iii Device for forming bio-logs and method therefor

Similar Documents

Publication Publication Date Title
CN106427024A (en) Forage briquetting machine
CN207496047U (en) Household garbage compactor
CN206287557U (en) Forage briquetting forming machine
CN212349853U (en) Environment-friendly garbage compression vacuum packer
CN202319016U (en) Brown coal forming machine
CN201792512U (en) Spiral feed type straw compressor
CN102774026A (en) Reciprocate plunger type biomass briquetting machine
CN110124352A (en) A kind of subcritical abstraction equipment and technology for strengthening reaction based on micro-interface
CN203919787U (en) A kind of biomass fuel is passed pressing machine
CN203185666U (en) Downward-pressing and demolding mechanism of bi-directional powder pressing forming machine
CN207630597U (en) A kind of pressure texture of novel precommpression biomass forming machine
CN206030607U (en) Grape crusher
CN202623335U (en) Automatic soft broken material blocking machine
CN203077649U (en) Double-end mechanical club pressing machine
CN2780371Y (en) Garbage dewatering device
CN205601226U (en) Hydraulic pressure briquetting machine
CN209096093U (en) A kind of tiny raw material impact molding machine of biomass
CN210278391U (en) Filter pressing device is used in production of high molecular polymer cement waterproof coating
CN211807238U (en) Plastic foam compressor
CN210234094U (en) A packing apparatus for scrap iron
CN101032867A (en) Triplex plunger type biofuel forming machine
CN210057502U (en) Filter press with filter plates divided into three groups and opened and closed
CN1810393A (en) Garbage dewatering mechanism
CN209275375U (en) The mobile pressure head of rectilinear collection garbage compression box
CN216679510U (en) Novel impurity compression equipment

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20170630

Termination date: 20191102

CF01 Termination of patent right due to non-payment of annual fee