CN207807112U - Full-automatic arc fold bending butt welding machine - Google Patents

Full-automatic arc fold bending butt welding machine Download PDF

Info

Publication number
CN207807112U
CN207807112U CN201721713450.0U CN201721713450U CN207807112U CN 207807112 U CN207807112 U CN 207807112U CN 201721713450 U CN201721713450 U CN 201721713450U CN 207807112 U CN207807112 U CN 207807112U
Authority
CN
China
Prior art keywords
bending
welding
eccentrically weighted
weighted shaft
full
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
CN201721713450.0U
Other languages
Chinese (zh)
Inventor
左国正
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.)
Xinhui District Jiangmen Xinhui Electromechanical Equipment Co Ltd
Original Assignee
Xinhui District Jiangmen Xinhui Electromechanical Equipment Co Ltd
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 Xinhui District Jiangmen Xinhui Electromechanical Equipment Co Ltd filed Critical Xinhui District Jiangmen Xinhui Electromechanical Equipment Co Ltd
Priority to CN201721713450.0U priority Critical patent/CN207807112U/en
Application granted granted Critical
Publication of CN207807112U publication Critical patent/CN207807112U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The utility model discloses a kind of full-automatic arc fold bending butt welding machines, including arc shaping mechanism, welding mechanism, clamping frame mechanism, tangent mechanism, bar straightening mechanism and thread feeding mechanism, it is characterised in that:The arc shaping mechanism includes at least being made of mold core and eccentrically weighted shaft, and the mold core is set to the axle center of eccentrically weighted shaft, and eccentrically weighted shaft is relatively rotated around mold core.Driving eccentrically weighted shaft rotation pressure holding metal wire rod to realize the arc fold bending molding of metal wire rod by way of mold core shape, eccentrically weighted shaft rotation is driven by bending rack and bending gear mechanism simultaneously, keep shaping mechanism overall structure simple, easily operated realization, and it is of low cost, Forming Quality is good;Additionally by arc shaping mechanism and welding mechanism etc. is effectively combined, realizes that automatic integratedization is welded in bending, improve production efficiency.

Description

Full-automatic arc fold bending butt welding machine
Technical field
The utility model is related to a kind of bending butt welding machine technical fields, more particularly to arc fold bending butt welding machine.
Background technology
When daily plant produced manufactures some arcs or oval frame, all it is respectively necessary for carrying out bending and molding and weldering It is connected into type, wherein bending and molding is a kind of common technique in mechanical processing, and previous bending and molding is usually artificial bending, and With wire rod bending shape structure because production requirement it is increasingly complicated, manual type Bending Processing much cannot be satisfied, simultaneously Artificial bending general work efficiency is low, and production precision is low;Then for production automation is improved, people have invented bender progress Bending Processing, and existing bender is generally divided into impact briquetting machine and wheeled roller head machine, impact briquetting machine is rushing It is easy to damage fracture to wire surface when pressure, bending is ineffective, low production efficiency, and precision is relatively low;And wheeled rolling Molding machine molding is irregular, and bending part has been easy wedge angle after molding;Above-mentioned bender in the prior art is required to multiple simultaneously Driving device and programming could control, and professional is needed to operate, and device structure is caused excessively to complicate, and produce Cost is excessively high, and oval frame needs are welded additionally by human hand after bending and molding, cannot achieve bending and welding It is molded automatic integratedization, causes low production efficiency, Forming Quality poor.
Invention content
In view of the above shortcomings of the prior art, the utility model provides a kind of full-automatic arc fold bending butt welding machine, whole It is simple in structure easily operated, of low cost, stable quality, while can realize bending and welding fabrication automatic integratedization, it produces It is efficient, high precision machining.
The utility model is realized in that above-mentioned purpose:
Full-automatic arc fold bending butt welding machine, including arc shaping mechanism, welding mechanism, clamping frame mechanism, tangent mechanism, straightening Mechanism and thread feeding mechanism, the arc shaping mechanism include at least being made of mold core and eccentrically weighted shaft, and the mold core is set to The axle center of eccentrically weighted shaft, eccentrically weighted shaft are relatively rotated around mold core.
Wherein, the eccentrically weighted shaft is equipped with the bending driving mechanism for driving eccentrically weighted shaft to rotate, the bending driving Mechanism includes bending cylinder, bending rack and bending gear, and the output end of the bending cylinder is connected with bending rack, described Eccentrically weighted shaft is mounted on bending gear, and bending rack is vertically installed in the side of eccentrically weighted shaft, and is mutually nibbled with bending gear Crossed belt moves eccentrically weighted shaft rotation.
Wherein, the shape of the mold core is round or semicircle, and the outer diameter of the mold core is less than the outer diameter of eccentrically weighted shaft.
Wherein, the welding mechanism is located at the top of arc shaping mechanism, and welding mechanism includes left weld assembly and backhand welding Connected components, the left weld assembly and backhand welding connected components are respectively equipped with upper welding electrode and lower welding electrode, upper welding electrode Be equipped with clamp cylinder, the left weld assembly or backhand welding connected components at least one be equipped with to welding cylinder.
Wherein, the clamping frame mechanism is at least formed by sending deckle board, sending frame driving mechanism, folder frame and pressing from both sides frame driving mechanism, Send deckle board to be arranged send the rear side of deckle board to be connected with frame driving mechanism is sent in the lower section of tangent mechanism;The folder deckle board setting exists The right opposite for sending deckle board, the rear side for pressing from both sides deckle board are connected with folder frame driving mechanism.
Wherein, the tangent mechanism includes tangent line hydraulic cylinder, cutter and threading block, the tangent line hydraulic cylinder and cutter phase Connection;The threading block horizontal cross, which runs through, is equipped with threading hole, and cutter is arranged in the side of threading block and on threading hole Side.
Wherein, the bar straightening mechanism includes at least being made of lateral straightening component, longitudinal straightening component, the transverse direction straightening Component and longitudinal straightening component are staggered and are provided with multiple straightening pulleys, between being equipped between the multiple straightening pulley Gap, the gap form straightening channel.
Wherein, the thread feeding mechanism is located at the side of tangent mechanism, the thread feeding mechanism include two pairs of upper pressure wheels and with The mutually matched lower pressure wheel of upper pressure wheel, the upper pressure wheel or lower pressure wheel are additionally provided with the gear rotated with one heart, the gear it Between engagement be connected with transmission gear, pass through drive gears moving gear and upper pressure wheel or lower pressure wheel rotation.
The beneficial effects of the utility model:By driving eccentrically weighted shaft rotation pressure holding metal wire rod along the side of mold core shape Formula realizes the arc fold bending molding of metal wire rod, while driving eccentrically weighted shaft rotation by bending rack and bending gear mechanism, Keep shaping mechanism overall structure simple, easily operated realization, and also it is of low cost, Forming Quality is good;Additionally by effectively tying Arc shaping mechanism and welding mechanism etc. are closed, realizes that automatic integratedization is welded in bending, improves production efficiency.
Description of the drawings
The utility model is further illustrated below in conjunction with the accompanying drawings:
Fig. 1 is the structural schematic diagram of the utility model;
Fig. 2 is the overall structure diagram that the utility model Fig. 1 dismantles protective plate and welding mechanism;
Fig. 3 is the left view that the utility model Fig. 2 removes shaping mechanism;
Fig. 4 is the front view of arc shaping mechanism and tangent mechanism in the utility model.
In figure, 1. arc shaping mechanisms, 11. mold cores, 12. eccentrically weighted shafts, 13. bending cylinders, 14. bending racks, 15. foldings Curved gear;2. welding mechanism, 21. left weld assemblies, 22. backhand welding connected components, welding electrode on 23., 24. times welding electrodes, 25. Clamp cylinder, 26. pairs of welding cylinders;3. clamping frame mechanism, 31. send deckle board, and 32. send frame driving mechanism, 33. folder deckle boards, 34. folder frames to drive Motivation structure;4. tangent mechanism, 41. tangent line hydraulic cylinders, 42. cutters, 43. threading blocks, 44. threading holes;5. bar straightening mechanism, 51. is horizontal To straightening component, 52. longitudinal straightening components, 53. straightening pulleys;6. thread feeding mechanism, 61. upper pressure wheels, 62. lower pressure wheels, 63. teeth Wheel, 64. transmission gears;7. metal wire rod, 8. protective plates.
Specific implementation mode
As shown in Figures 1 to 4, full-automatic arc fold bending butt welding machine, including arc shaping mechanism 1, welding mechanism 2, folder frame Mechanism 3, tangent mechanism 4, bar straightening mechanism 5 and thread feeding mechanism 6, the arc shaping mechanism 1 include at least by mold core 11 and partially Heart shaft 12 forms, and the mold core 11 is set to the axle center of eccentrically weighted shaft 12, and eccentrically weighted shaft 12 is relatively rotated around mold core 11.Molding When, drive eccentrically weighted shaft 12 press metal wire rod 7 along 11 outer diameter of mold core rotate by way of, make metal wire rod 7 fitting at Type realizes the arc fold bending molding of metal wire rod 7 to 11 shape of mold core, while passing through bending rack 14 and 15 machine of bending gear Tool drives eccentrically weighted shaft 12 to rotate, and keeps shaping mechanism overall structure simple, easily operated realization, and of low cost, is molded matter It measures;Additionally by arc shaping mechanism 1 and welding mechanism 2 etc. is effectively combined, realizes that automatic integratedization is welded in bending, improve Production efficiency.
As shown in figure 4, in order to drive eccentrically weighted shaft rotate and can export enough torque to metal wire rod 7 into Row bending, the bending driving mechanism include bending cylinder 13, bending rack 14 and bending gear 15, the bending cylinder 13 Output end be connected with bending rack 14, the eccentrically weighted shaft 12 is mounted on bending gear 15, and bending rack 14 is vertically installed in The side of eccentrically weighted shaft 12, and be intermeshed with bending gear 15 and eccentrically weighted shaft 12 is driven to rotate, to by controlling bending The mode simple realization driving bending shaft 11 that rack 14 is mechanically connected with bending gear 15 rotates, and makes shaping mechanism structure more Simply, it is easy to accomplish;It simultaneously can be by the process distance of control bending cylinder 13, to turning for easily controllable eccentrically weighted shaft 12 Dynamic amplitude.
As shown in figure 4, in order to realize that mold core 11 can coordinate 12 bending of eccentrically weighted shaft to go out arc, 11 shape of the mold core is Round or semicircle, the outer diameter of the mold core 11 is less than the outer diameter of eccentrically weighted shaft 12, to enable metal wire rod 7 to turn in bias Fitting is along 11 shape precise forming of mold core under the rotation of axis 12.
As shown in Figure 2 and Figure 3, in order to realize that the metal wire rod after bending and molding 7 carries out welding fabrication, thus it is described Welding mechanism 2 is located at the top of arc shaping mechanism 1, and welding mechanism 2 includes left weld assembly 21 and backhand welding connected components 22, described Left weld assembly 21 and backhand welding connected components 22 are respectively equipped with upper welding electrode 23 and lower welding electrode 24, and upper welding electrode 23 is equal Equipped with clamp cylinder 25, the left weld assembly 21 or backhand welding connected components 22 at least one be equipped with to welding cylinder 26.Wherein, lower weldering The shape of receiving electrode 24 is " L " font, and it is in " 7 " font that the shape of upper welding electrode 23 is matched with lower welding electrode 24.Metal Wire rod 7 is cut off after being bent over molding by tangent mechanism 4, and metal wire rod 7 forms two after being cut off by tangent mechanism 4 End, and given to welding mechanism 2 by giving the driving of frame driving mechanism 32 that deckle board 31 is given to move forward two ends, make gold Belong to 7 two ends of wire rod to be hung in the lower welding electrode 24 of left weld assembly 21 and backhand welding connected components 22, then lead to respectively Crossing the driving of clamp cylinder 25, above welding electrode 23 moves down two ends of the metal wire rod 7 that is clamped and makes metal wire rod 7 contacts are powered, and drive left weld assembly 21 or backhand welding connected components 22 to be clamped two of metal wire rod 7 finally by welding cylinder 26 End is close to welding is closed up, to complete butt welding welding.
As shown in figure 3, give the metal wire rod 7 after bending and molding to progress welding processing at welding mechanism 2 to realize, Therefore the clamping frame mechanism 3 is at least formed by sending deckle board 31, sending frame driving mechanism 32, folder deckle board 33 and pressing from both sides frame driving mechanism, Send deckle board 31 to be arranged send the rear side of deckle board 31 to be connected with frame driving mechanism 32 is sent in the lower section of tangent mechanism 4;The folder deckle board The rear side for pressing from both sides deckle board 33 in the right opposite for sending deckle board 31 is arranged with frame driving mechanism is pressed from both sides to be connected.Specifically, in metal wire rod After 7 bending and moldings, it is flat that the cooperation under the driving of folder frame driving mechanism of folder deckle board 33 send deckle board 31 together to clamp metal wire rod 7 It is whole, then again by sending frame driver driving that deckle board 31 and folder deckle board 33 is sent together to send the clamping of metal wire rod 7 to welding mechanism 2 Place carries out butt welding welding processing.
As shown in Figure 3 and Figure 4, the tangent mechanism 4 includes rack tangent line hydraulic cylinder 41, cutter 42 and threading block 43, The tangent line hydraulic cylinder 41 is connected with cutter 42;43 horizontal cross of threading block, which runs through, is equipped with threading hole 44, and cutter 42 is set It sets in the side of threading block 43 and above threading hole 44.After 1 bending and molding of arc shaping mechanism, tangent line hydraulic cylinder 41 The driving cooperation threading block 43 of cutter 42 will be cut off across the metal wire rod 7 in 44 one end of threading hole.
As shown in Figures 1 and 2, in order to enable metal wire rod 7 quickly to carry out straightening correction, the bar straightening mechanism 5 includes It is at least made of lateral straightening component 51, longitudinal straightening component 52, the transverse direction straightening component 51 and longitudinal straightening component 52 are It is staggered and is provided with multiple straightening pulleys 53, gap is equipped between the multiple straightening pulley 53, the gap is formed Straightening channel, to make metal wire rod 7 by the way that staggeredly uniformly rolling is adjusted by about 53 multiple straightening pulleys in straightening channel Straight correction.
As shown in Figures 1 and 2, it is sent to processing stations to enable metal wire rod 7 further to fast move, it is described to send Line mechanism 6 is located at the side of tangent mechanism 4, the thread feeding mechanism 6 include two pairs of upper pressure wheels 61 and with 61 phase of the upper pressure wheel The lower pressure wheel 62 mutually coordinated, the upper pressure wheel 61 or lower pressure wheel 62 are additionally provided with the gear 63 rotated with one heart, between the gear 63 Engagement is connected with transmission gear 64, is rotated with moving gear 63 and upper pressure wheel 61 or lower pressure wheel 62 by transmission gear 64.Transmission Gear 64 drives two gears 63 to move simultaneously respectively, and then the speed for driving the lower pressure wheel 62 being connect with gear 63 to be consistent Rotation, to ensure that metal wire rod 7 can be steady, rapidly, continuously mobile.
Wherein, in order to enable bending butt welding machine general safety is beautiful, the welding mechanism 2, tangent mechanism 4, arc molding It carries out blocking protection in the protective plate 8 that mechanism 1 and clamping frame mechanism 3 are arranged in rack.
In order to realize that arc fold bending welds automatic integratedization, therefore use the processing side of full-automatic arc fold bending butt welding machine Method comprises the following steps that:
First metal wire rod 7 be threaded by bar straightening mechanism 5 and thread feeding mechanism 6 be positioned over eccentrically weighted shaft 12 and mold core 11 it Between, when metal wire rod 7 is moved to corresponding processing pitch, bending cylinder 13 drives the movement of eccentrically weighted shaft 12 and around 11 turns of mold core It is dynamic, it needs molding radian to be adjusted the rotation amplitude of eccentrically weighted shaft 12 according to metal wire rod 7, makes metal wire rod 7 in bias The lower shape bending and molding for being bonded mold core 11 is clamped to corresponding radian in the rotation of shaft 12;In 7 bending and molding one end of metal wire rod Afterwards, eccentrically weighted shaft 12 reset, metal wire rod 7 move forward to next section processing pitch, then proceed to driving eccentrically weighted shaft 12 into Row bending and molding, to which Bending Processing goes out the oval frame that both ends are arc;Last tangent mechanism 4 cuts off metal wire rod 7 simultaneously Oval frame clamped by clamping frame mechanism 3 smooth, then oval frame is sent to welding mechanism 2 by clamping frame mechanism 3 and is welded It is connected into type.

Claims (8)

1. full-automatic arc fold bending butt welding machine, including arc shaping mechanism(1), welding mechanism(2), clamping frame mechanism(3), cutting machine Structure(4), bar straightening mechanism(5)And thread feeding mechanism(6), it is characterised in that:The arc shaping mechanism(1)Including at least by mold core (11)And eccentrically weighted shaft(12)Composition, the mold core(11)It is set to eccentrically weighted shaft(12)Axle center, eccentrically weighted shaft(12)Around mould Core(11)It relatively rotates.
2. full-automatic arc fold bending butt welding machine according to claim 1, it is characterised in that:The eccentrically weighted shaft(12)Equipped with use In driving eccentrically weighted shaft(12)The bending driving mechanism of rotation, the bending driving mechanism include bending cylinder(13), bending tooth Item(14)And bending gear(15), the bending cylinder(13)Output end and bending rack(14)It is connected, described eccentric turn Axis(12)Mounted on bending gear(15), bending rack(14)It is vertically installed in eccentrically weighted shaft(12)Side, and and bending Gear(15)Intermeshing drives eccentrically weighted shaft(12)Rotation.
3. full-automatic arc fold bending butt welding machine according to claim 1, it is characterised in that:The mold core(11)Shape be circle Shape or semicircle, the mold core(11)Outer diameter be less than eccentrically weighted shaft(12)Outer diameter.
4. full-automatic arc fold bending butt welding machine according to claim 1, it is characterised in that:The welding mechanism(2)Positioned at arc Shape shaping mechanism(1)Top, welding mechanism(2)Including left weld assembly(21)With backhand welding connected components(22), the left welding Component(21)With backhand welding connected components(22)Respectively it is equipped with upper welding electrode(23)With lower welding electrode(24), upper welding electrode (23)It is equipped with clamp cylinder(25), the left weld assembly(21)Or backhand welding connected components(22)At least one is equipped with to welding cylinder (26).
5. full-automatic arc fold bending butt welding machine according to claim 1, it is characterised in that:The clamping frame mechanism(3)At least by Send deckle board(31), send frame driving mechanism(32), folder deckle board(33)And folder frame driving mechanism(34)Composition, send deckle board(31)Setting In tangent mechanism(4)Lower section, send deckle board(31)Rear side and send frame driving mechanism(32)It is connected;The folder deckle board(33)If It sets and is sending deckle board(31)Right opposite, press from both sides deckle board(33)Rear side with folder frame driving mechanism(34)It is connected.
6. full-automatic arc fold bending butt welding machine according to claim 1, it is characterised in that:The tangent mechanism(4)Including cutting Line hydraulic cylinder(41), cutter(42)And threading block(43), the tangent line hydraulic cylinder(41)With cutter(42)It is connected;It is described to wear Line block(43)Horizontal cross, which runs through, is equipped with threading hole(44), cutter(42)Setting is in threading block(43)Side and positioned at threading Hole(44)Top.
7. full-automatic arc fold bending butt welding machine according to claim 1, it is characterised in that:The bar straightening mechanism(5)Including extremely Less by lateral straightening component(51), longitudinal straightening component(52)Composition, the transverse direction straightening component(51)With longitudinal straightening component (52)It is staggered and is provided with multiple straightening pulleys(53), the multiple straightening pulley(53)Between be equipped with gap, institute It states gap and forms straightening channel.
8. full-automatic arc fold bending butt welding machine according to claim 1, it is characterised in that:The thread feeding mechanism(6)Positioned at cutting Line mechanism(4)Side, the thread feeding mechanism(6)Including two pairs of upper pressure wheels(61)And with the upper pressure wheel(61)It cooperates Lower pressure wheel(62), the upper pressure wheel(61)Or lower pressure wheel(62)It is additionally provided with the gear rotated with one heart(63), the gear(63) Between engagement be connected with transmission gear(64), pass through transmission gear(64)Band moving gear(63)And upper pressure wheel(61)Or lower pressure wheel (62)Rotation.
CN201721713450.0U 2017-12-11 2017-12-11 Full-automatic arc fold bending butt welding machine Expired - Fee Related CN207807112U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201721713450.0U CN207807112U (en) 2017-12-11 2017-12-11 Full-automatic arc fold bending butt welding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201721713450.0U CN207807112U (en) 2017-12-11 2017-12-11 Full-automatic arc fold bending butt welding machine

Publications (1)

Publication Number Publication Date
CN207807112U true CN207807112U (en) 2018-09-04

Family

ID=63331805

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201721713450.0U Expired - Fee Related CN207807112U (en) 2017-12-11 2017-12-11 Full-automatic arc fold bending butt welding machine

Country Status (1)

Country Link
CN (1) CN207807112U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109500294A (en) * 2018-09-29 2019-03-22 佛山市顺德区奔蓝五金机械有限公司 Gantry frame structure wire molding machine
CN110572953A (en) * 2019-08-26 2019-12-13 楼显华 crystal diode sleeve pipe bending assembly
CN113414312A (en) * 2021-02-05 2021-09-21 广东金客厨房科技有限公司 Automatic straightening, bending and forming equipment for metal wire

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109500294A (en) * 2018-09-29 2019-03-22 佛山市顺德区奔蓝五金机械有限公司 Gantry frame structure wire molding machine
CN110572953A (en) * 2019-08-26 2019-12-13 楼显华 crystal diode sleeve pipe bending assembly
CN110572953B (en) * 2019-08-26 2022-08-16 重庆达标电子科技有限公司 Crystal diode sleeve pipe bending assembly
CN113414312A (en) * 2021-02-05 2021-09-21 广东金客厨房科技有限公司 Automatic straightening, bending and forming equipment for metal wire

Similar Documents

Publication Publication Date Title
CN207807112U (en) Full-automatic arc fold bending butt welding machine
CN108188307A (en) Full-automatic bending butt welding machine and its processing method
CN101829885B (en) Full-automatic integrated character enclosing machine
CN206298081U (en) A kind of automatic turning device of adjustable revolution center of gravity
CN111069366B (en) A spot welding device of bending is managed in side for guardrail production
CN110280644A (en) A kind of hardware dies automatic press processing unit (plant)
CN204504468U (en) A kind of welding manipulator
CN206578923U (en) A kind of timber processes multi-angle cutting mechanism
CN109014764A (en) A kind of pipeline automatic welding connection device
CN203579178U (en) Full-automatic pin shaft cut-off machine
CN204867190U (en) Metal forming robot
CN202655779U (en) High-speed seam welder
CN206604989U (en) A kind of three gear drives of novel multi-station parts shaping machine
CN207238851U (en) Socket flanger
CN202263869U (en) Novel automatic iron railing stool manufacturing machine
CN103465025A (en) Fully automatic pin shaft cutting machine
CN204975734U (en) Build -up welding machine
CN205966906U (en) Machine of twisting is turned round to square steel
CN216138022U (en) Cold header for processing tapered roller
CN216423939U (en) Wire inlay mould for metal processing by applying enamel process
CN208437790U (en) A kind of machining welder
CN218574800U (en) A plastic tool for MIM axle piece
CN2475486Y (en) Roller-pressing shaping equipment with shearing device
CN102357621A (en) Novel automatic iron railings stool manufacturing machine
CN2536388Y (en) Manually operated joint device for steel cord fabric

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: 20180904

Termination date: 20191211

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