A kind of double-station lifting device and welding systemTechnical field
The present invention relates to automotive trim technical field of processing equipment, more particularly to a kind of double-station lifting device and welderingWelding system.
Background technology
Automobile door plate is one of important component of automobile.Car door back veneer includes multiple made of plastics or fibrous materialParts, when production, need to be by each parts welding assemblies on door back veneer.In order to promote welding efficiency, reduction labor intensity, carryHigh processing quality, this application provides a kind of double-station lifting devices for welding system, and flowing water metaplasia is automated to meetThe use demand of production.
Invention content
For the above-mentioned prior art the problem of, the object of the present invention is to provide a kind of high degree of automation, productionsEfficient, properties of product and qualification rate are high, input cost low a kind of double-station lifting device and welding system.
To achieve the purpose of the present invention, the present invention provides a kind of double-station lifting device, the lifting device includes carryingDevice frame, lifting device actuating unit, balance weight mechanism, conveyor pallet structure are risen, the lifting device actuating unit is set toLifting device framework upper, the balance weight mechanism are set to inside lifting device frame left, the conveyor pallet structure settingInside lifting device frame right.
Correspondingly, the present invention also provides a kind of welding system, above-mentioned double-station lifting device is applied to the weldingIn system.
Compared with prior art, beneficial effects of the present invention are, when use, pallet is placed on conveyor pallet structureOn, conveyor pallet structure moves up and down under the drive of lifting device actuating unit on lifting device frame, in two stationsBetween converted, and conveyor pallet structure can realize the automatic transmission of pallet, reduce labor intensity, improve welding effectRate improves product quality, is convenient for industrially promotion and application.
Description of the drawings
Fig. 1 show the first schematic diagram of structure of the lifting device of the embodiment of the present application；
Fig. 2 show the second schematic diagram of structure of the lifting device of the embodiment of the present application；
Fig. 3 show the structure third schematic diagram of the lifting device of the embodiment of the present application；
Fig. 4 show the 4th schematic diagram of structure of the lifting device of the embodiment of the present application；
Fig. 5 show the overall structure diagram of the welding system of the embodiment of the present application；
Fig. 6 show the first schematic diagram of structure of the conveying mechanism of the welding system of the embodiment of the present application；
Fig. 7 show the second schematic diagram of structure of the conveying mechanism of the welding system of the embodiment of the present application；
Fig. 8 show the structure third schematic diagram of the conveying mechanism of the welding system of the embodiment of the present application；
Fig. 9 show the 4th schematic diagram of structure of the conveying mechanism of the welding system of the embodiment of the present application；
Figure 10 show the structural schematic diagram of the robot carrying mechanism of the welding system of the embodiment of the present application；
Figure 11 show the structural schematic diagram of the 3-D storehouse of the welding system of the embodiment of the present application；
Figure 12 show the first schematic diagram of structure of the pallet of the welding system of the embodiment of the present application；
Figure 13 show the second schematic diagram of structure of the pallet of the welding system of the embodiment of the present application；
Figure 14 show the structure third schematic diagram of the pallet of the welding system of the embodiment of the present application；
Figure 15 show the 4th schematic diagram of structure of the pallet of the welding system of the embodiment of the present application；
In figure, 1 lifting device, 1-1 lifting device frames, 1-2 lifting device actuating units, 1-21 promotion motors, 1-22Connecting plate for electric motor, 1-23 promotion motor sprockets, 1-24 promotion driven sprockets, 1-25 promotion axis, 1-26 lifting sprockets, 1-27 are verticalBearing block, 1-28 connecting screws, 1-3 balance weight mechanisms, 1-31 counter-balanced carriages, 1-32 clump weights, 1-33 guide wheel assemblies, 1-34 are oriented toWheel, 1-35, which matches, to be redirected, 1-4 conveyor pallet structures, 1-41 tray racks, 1-42 lifting device sliding rail 1-43 lifting device sliding blocks,1-44 lifting device slider connecting plates, 1-45 conveying cylinders, 1-46 conveying cylinder gears, 1-47 cylinder support plates, 1-48 transmissionMotor, 1-49 transmit motor gear, 2 conveying mechanisms, and 2-1 conveys wire frame, 2-2 railway lines, 2-3 second reducing motors, 2-4 biographiesSensor, 2-5 sliding rails, 2-6 buffers, 2-7 secondary positioners, 2-8 servo slide tables, 2-81 movable blocks, 2-82 positioning devices, 2-83 servo motors, 2-84 servo motor gears, 2-85 servo motor mounting plates, 2-86 racks, 2-9 sliding rail bottom plates, 2-10 sliding blocks,2-11 movable block connecting plates, 3 welding robots, 4 put part station, 5 pickup stations, 6 3-D storehouses, 6-1 pallet racks, and 7Robot carrying mechanism, 7-1 transfer robots, 7-2 transfer robot pedestals, 7-3 tracks, the robotically-driven racks of 7-4,7-5Robotically-driven motor, 8 safe fences, 9 control mechanisms, 10 pallets, 10-1 upper cover plates, 10-2 bottom plates, 10-21 first are limitedHole, the second limit holes of 10-22,10-3 hydraulic damping devices, the pneumatic positioning pins of 10-31, the pneumatic locating pin brackets of 10-32,10-33Locating piece, 10-34 hydraulic bjuffers, 10-35 adjustment bolts, 10-36 cushion blocks, 10-4 upper cover plate turnover devices, 10-41 overturn gasCylinder, 10-42 tumble cylinder link blocks, 10-43 tumble cylinder connecting seats, 10-44 torsion shafts, 10-45 overturn bracing strut.
Specific implementation mode
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.It should be appreciated that described hereinSpecific embodiment be only used to explain the present invention, be not intended to limit the present invention.
It should be noted that " connection " described herein and the word for expressing " connection ", as " being connected "," connected " etc. was both directly connected to another component including a certain component, and also passed through other component and another portion including a certain componentPart is connected.
It should be noted that term used herein above is merely to describe specific implementation mode, and be not intended to restricted rootAccording to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulativeBe also intended to include plural form, additionally, it should be understood that, when in the present specification using belong to "comprising" and/or " packetInclude " when, indicate existing characteristics, step, operation, component or module, component and/or combination thereof.
For ease of description, herein can with use space relative terms, as " ... on ", " in ... top "," ... upper surface ", " above " etc., for describing such as a component shown in the figure or module or feature and otherThe spatial relation of component or module or feature.It should be understood that spatially relative term be intended to comprising in addition to component orDifferent direction in use or operation except orientation of person's module described in figure.For example, if component in attached drawingPerhaps module is squeezed, be described as " above other component either module or construction " or " in other component or module orOn construction " component will either be positioned as after module " below other component or module or construction " or " at otherUnder component or module or construction ".Thus, exemplary term " ... top " may include " ... top " and" in ... lower section " two kinds of orientation.The component or module can also the positioning of other different modes (be rotated by 90 ° or be in otherOrientation), and respective explanations are made to the opposite description in space used herein above.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phaseMutually combination.
Embodiment 1
As shown in Figs 1-4, the lifting device 1 in the present embodiment includes lifting device frame 1-1, lifting device actuating unit1-2, balance weight mechanism 1-3, conveyor pallet structure 1-4, the lifting device actuating unit 1-2 are set to lifting device frame 1-1Top, the balance weight mechanism 1-3 are set to inside on the left of lifting device frame 1-1, and the conveyor pallet structure 1-4, which is set to, to be carriedIt rises internal on the right side of device frame 1-1.
Wherein, the lifting device actuating unit 1-2 includes promoting motor 1-21 and promotion axis 1-25, the promotion motor1-21 is fixedly connected by connecting plate for electric motor 1-22 with lifting device frame 1-1, and the promotion axis 1-25 passes through vertical shaft bearing1-27 is linked with lifting device frame 1-1, is connected on the promotion motor 1-21 and is promoted motor sprocket 1-23, and motor train is promotedWheel 1-23 is connected by transmission chain with driven sprocket 1-24 is promoted, and is promoted driven sprocket 1-24 and is set on promotion axis 1-25, carriesThe both sides lifting shaft 1-25 are respectively arranged with lifting sprocket 1-26, lifting sprocket 1-26 by transmission chain respectively with balance weight mechanism 1-3 andConveyor pallet structure 1-4 is fixedly connected.
Wherein, the balance weight mechanism 1-3 includes counter-balanced carriage 1-31, and clump weight 1-32 is provided in the counter-balanced carriage, describedThe both sides counter-balanced carriage 1-31 are provided on directive wheel 1-34, the lifting device frame 1-1 by guide wheel assemblies 1-33 and are provided withWith directive wheel be used cooperatively with being redirected 1-35.
Wherein, 1-31 is provided with connecting screw 1-28 on the counter-balanced carriage, transmission chain tune one end on lifting sprocket 1-26It is connect with the connecting screw 1-28 on counter-balanced carriage 1-31.
Wherein, the conveyor pallet structure 1-4 includes tray rack 1-41 and conveying cylinder 1-45, tray rack 1-41 and sliding blockConnecting plate 1-44 is fixedly connected, and is provided on slider connecting plate on sliding block 1-43, the sliding block 1-43 and lifting device frame 1-1Lifting device sliding rail 1-42 be used in combination the up and down motion for realizing tray rack 1-41, be provided with cylinder support plate on tray rack1-47, conveying cylinder 1-45 are fixedly connected with cylinder support plate 1-47 axis holes, are provided in the conveying cylinder 1-45 two end axlesConveying cylinder gear 1-46, adjacent conveyor drum gear 1-46 are linked by driving chain, the setting of the lower ends the tray rack 1-41There is transmission motor 1-48, transmission motor gear 1-49, the transmission motor gear 1- are provided on the transmission motor 1-48 axis49 are linked by driving chain and drum gear 1-46, and motor shaft rotation drives conveying cylinder 1-45 rotations.
Wherein, the sides the lifting device sliding rail 1-42 both ends are respectively arranged with range sensor, for detecting tray rackSituation, the tray rack lower end is provided with sensor, has pallet-free on tray rack for detecting.
Embodiment 2
As shown in figure 5, the application lifting device is applied in welding system, welding system includes welding production line, solidRepository 6 and robot carrying mechanism 7, safe fence 8, the robot carrying mechanism 7 is located at 3-D storehouse 6 and welding is given birth toBetween producing line, the welding production line, 3-D storehouse 6, robot carrying mechanism 7 are located in safe fence 8；The welding lifeProducing line is for welding relay part to be welded；The robot carrying mechanism 7 is for replacing pallet；The safe fence is transported for ensureingCapable safety；The 3-D storehouse 6 is used for storage trays.
In embodiments of the present invention, the welding production line includes the identical lifting device 1 of two structures and a conveyingMechanism, the pallet 10 for placing relay part to be welded, the lifting device 1 are located at the both ends of conveying mechanism, and the pallet is carryingIt rises device and conveying mechanism drives lower movement.
Wherein, as Figure 6-9, the conveying mechanism includes conveying wire frame 2-1, upper layer pipeline and lower layer's conveyingLine, upper layer pipeline and lower layer's pipeline are arranged in parallel on conveying wire frame 2-1, by upper layer pipeline by relay part to be weldedIt is moved to feeding side from feeding side, and in moving process, is welded；Lower layer's pipeline is by pallet from feeding oneSide is moved to feeding side.
Wherein, upper layer pipeline both sides are roller line 2-2 structures, and centre is servo slide table structure for conveying, the rollerDiatom 2-2 structures include being arranged at intervals on multiple rotating rollers, pallet in same level to be placed in the rotating roller of both sides,In, the multiple rotating roller is followed successively by power line segment, unpowered line segment and power line segment, institute from feeding side to feeding sideIt includes the first reducing motors being arranged on conveying wire frame 2-1 to state power line segment, and first reducing motors pass through chain drive positionIt is rotate in same direction in multiple rotating rollers of power line segment, the servo slide table structure for conveying includes horizontally-parallel being arranged at intervals on conveyingTwo sliding rail 2-5 on wire frame 2-1, servo slide table 2-8 are slidably connected on sliding rail 2-5, are moved left and right on sliding rail 2-5,The servo slide table 2-8 includes movable block 2-81, positioning device 2-82 and servo motor 2-83, servo motor gear 2-84, watchesTake motor mounting plate 2-85, the lower ends rack 2-86, the movable block 2-81 are provided with sliding block 2-10, the sliding block 2-10 and sliding rail2-5 is slidably connected, and the positioning device 2-82 being used in combination with the pallet is provided on the movable block 2-81, by describedPositioning device 2-82 limits the pallet, and to drive the pallet to move, the movable block 2-81 is arranged for spacing side by sideIt is multiple, multiple movable block 2-81 are both connected on movable block connecting plate 2-11, and servo motor 2-83 passes through servo motorMounting plate 2-85 is mounted on the conveying wire frame 2-1, and the lower ends at least one movable block 2-81 are connected with rack 2-86, describedServo motor gear 2-84, the servo motor gear 2-84 and the rack 2- are connected on the output shaft of servo motor 2-8386 are used in combination, the servo motor 2-83 bands forward and reverse rotations of moving gear 2-84, to drive described rack 2-86 or soIt is mobile, and then all movable block 2-81 synchronizing movings are driven, lower layer's pipeline both sides are roller line 2-2 structures, the rollerDiatom 2-2 structures include second for being arranged at intervals on multiple rotating rollers in same level and being arranged on conveying wire frame 2-1Decelerating motor 2-3, pallet are placed in the rotating roller of both sides, and the second reducing motors 2-3 is located at multiple by chain driveRotating roller rotates in same direction, to drive pallet to move.
Wherein, the positioning device 2-82 is the first cylinder being disposed longitudinally on the lower faces movable block 2-81, the first gasCylinder piston rod is on movable block 2-81, the pallet, position corresponding with first cylinder piston rod is provided with firstLimit hole 10-21, the first limit hole 10-21 are used in combination with first cylinder piston rod, and first cylinder is livedStopper rod, which slides into, forms limit in the first limit hole 10-21.
Wherein, first cylinder is two, and correspondingly, the first limit hole 10-21 is two.
Wherein, the quantity of the movable block 2-81 is configured according to the quantity of welding post.
Wherein, on conveying wire frame 2-1 with the position of welding post is matched is provided with secondary positioner 2-7,The secondary positioner 2-7 is the second longitudinally disposed cylinder, on the pallet, position corresponding with the second cylinder piston rodIt installs and is equipped with the second limit hole 10-22, the second limit hole 10-22 is used in combination with second cylinder piston rod, instituteIt states the second cylinder piston rod and slides into formation limit in the second limit hole 10-22, to realize in welding, pallet is determinedPosition.
Wherein, the both sides the conveying wire frame 2-1, welding robot, the weldering are correspondingly provided with welding postWelding robot is for welding the relay part to be welded on welding post.
Wherein, on conveying wire frame 2-1 with the position of welding post is matched is provided with for delaying to palletThe buffer 2-6 of punching.
Wherein, on conveying wire frame 2-1 to the position of welding post is matched is provided with for detecting corresponding stationWhether the sensor 2-4 of pallet is placed with.
Wherein, the sliding rail 2-5 is connected by sliding rail bottom plate 2-9 with conveying wire frame 2-1.
Operation principle：Pallet will be to be welded by employee after part station is put in arrival automatically into upper layer pipeline by elevatorThe product of practicing midwifery are put into the mould of pallet, and after employee's end of operation, employee exits working region, are pressed and are executed switch, system detectioTo the first welding post pallet-free, starting the positioning device of first movement block, piston rod is positioned across the first limit hole, andPallet is driven to enter the first welding post, secondary positioner positions the pallet, and the piston rod of positioning device is limited from firstHole is drawn back, and movable block resets under the drive of servo motor, and the welding robot of the station is welded, after the completion of welding, theThe positioning device piston rod of two movable blocks is positioned across the first limit hole, and drive pallet enter the second welding post, twoSecondary positioning device positions the pallet, and the piston rod of positioning device is drawn back from the first limit hole, band of the movable block in servo motorDynamic lower reset, the welding robot of the station is welded, and after the completion of welding, carries out above-mentioned work successively, until successively in instituteThere is station to complete welding job, pallet is sent into pickup station by the rotating roller of power line segment, and welding fabrication is taken out by employeeProduct, finally, employee exit operating area, press and execute switch, and pallet is sent to by rotating roller in elevator, on elevatorConveyor pallet structure drops to the position of lower layer's pipeline, pallet is sent into lower layer's pipeline automatically, using rotating roller, by palletIt is sent into the other side of lower layer pipeline, then, is sent into the elevator of feeding side by the rotating roller of power line segment, on elevatorConveyor pallet structure rise to the position of upper layer pipeline, pallet is sent into upper layer pipeline automatically, is so recycled.
Embodiment 3
On the basis of the above embodiments, in the embodiment of the present invention, as shown in Figure 10, the robot carrying mechanism 7 wrapsInclude transfer robot 7-1, transfer robot pedestal 7-2 and track 7-3, robotically-driven rack 7-4, robotically-driven motor7-5, the transfer robot 7-1 are slidably connected by transfer robot pedestal 7-2 and track 7-3, the robotically-driven tooth7-4 is horizontally installed on track 7-3, and the robotically-driven motor 7-5 is mounted on transfer robot 7-1, the machineThe gear being used in combination with the robotically-driven rack 7-4 is installed in the drive shaft of people's driving motor 7-5, by with instituteThe relative movement for stating robotically-driven rack 7-4 drives the transfer robot 7-1 to be moved on track 7-3.
Embodiment 4
On the basis of the above embodiments, in embodiments of the present invention, as shown in figure 11, the 3-D storehouse 6 includesMultiple structures placed side by side identical pallet storing frame 6-1 is provided with corresponding identification on the pallet storing frame 6-1 framves and compilesCode, corresponding pallet are put into corresponding identification coding region.
Embodiment 5
On the basis of the above embodiments, in embodiments of the present invention, as shown in figs. 12-15, pallet 10 includes upper cover plateFirst limit hole 10-21 and the second limit hole 10-22 be set on 10-1, bottom plate 10-2, the bottom plate 10-2, upper cover plate 10-1,One end of bottom plate 10-2 by overturning bracing strut 10-45 and torsion shaft 10-44 articulated connections, upper cover plate 10-1, bottom plate 10-2 itBetween be additionally provided with upper cover plate turnover device 10-4, upper cover plate turnover device 10-4 includes tumble cylinder 10-41, is arranged in upper cover plateTumble cylinder link block 10-42 on 10-1, tumble cylinder the connecting seat 10-43, upper cover plate 10-1 being arranged on bottom plate 10-2,Relay part to be welded is placed between bottom plate 10-2, and hydraulic damping device 10-3, liquid are additionally provided between upper cover plate 10-1, bottom plate 10-2Pressure buffer unit 10-3 includes, pneumatic locating pin bracket 10-32 and locating piece 10-33, hydraulic bjuffer 10-34, adjustment bolt10-35, cushion block 10-36, the pneumatic positioning pin 10-31 are connected on the piston rod of cylinder, and cylinder is connected to pneumatic positioning pinHolder 10-32, locating piece 10-33, which are connected on upper cover plate 10-1, is arranged location hole, passes through pneumatic positioning pin 10-31 and location holeIt matches, upper cover plate 10-1, bottom plate 10-2 is locked, in addition, being provided with cushion block 10-36, the cushion block on bottom plate 10-2It is provided with hydraulic bjuffer 10-34 on 10-36, is additionally provided with adjustment bolt 10-35, for adjusting upper cover plate 10-1, bottom plate 10-The distance between 2.
In other preferred embodiments, safe fence may be used in the safe fence, surrounds square structure by other portionsPart fences up, and to improve safety, and can be respectively provided with echelette in the infall on each two side of the upper end of square structureRelease mechanism, and alarm lamp is set on safe fence, when someone crosses by force or has article to enter within the scope of echeletteWhen, triggering alarm lamp alarm.
It should be noted that the present invention includes a kind of multiplexing station ultrasonic wave flexible welding equipment, include to place product supportThe three-dimensional storage shelf of disk, high speed transfer robot put part section for place workpiece to be welded, and head end is used for putting part section and be connectedThe lifting device of product tray is replaced, and 15 welding robots for welding workpiece are connected with other end pickup section tail endLifting device for replacing product tray.Welding pipeline is divided into upper layer and lower layer, and upper layer both sides are roller line form, and centre isServo slide table conveys, and lower layer is roller line form, and welding post is 5, and 3 welding robots are arranged in each station, and both sides are eachThere are one manual operation stations.
Conveying mechanism includes the power line segment in left side, intermediate unpowered line segment, the power line segment on right side, wherein put partThe unpowered line segment in left side is arranged in station, and the unpowered line segment on right side is arranged in pickup station, and intermediate power line segment is successivelyMultiple welding posts are set, and multiple welding posts are used cooperatively, and complete whole welding job.Upper layer pipeline both sides respectively have1.5 meters of power line segments.
Seven axis robots can be used in the transfer robot of the robot carrying mechanism, and 3-D storehouse is one and places productionThe three-dimensional storage shelf of product pallet, including multiple pallet storing frame 6-1 placed side by side, pallet are placed on pallet storing frame,And each pallet placement location band identification coding, replace product tray automatically by seven axis robots, 300 kilograms of robot load-bearing,Working range 3150mm, robot end are equipped with pallet handgrip, and sound construction is stable, and sliding is accurate.Transfer robotPower control cabinet manipulates.
Part station is put using manually taking out relay part to be welded from line side prepackage group, is placed on and waits on a pallet, through peopleEnter welding post through upper layer pipeline after work confirmation.Welding post is placed in upper layer pipeline, and 5 Product jointing works are arranged altogetherPosition, can weld 5 welding workpieces, each welding post is provided with 3 six-joint robots, totally 15, each welding post simultaneouslyBuffer is set, and carries secondary detent mechanism.Three welding robots are arranged in each welding post, and each product tray carriesThe identification of RFID technique encodes, and the identification coding that the welding robot can be on automatic identification product tray automatically selects weldingProgram adapts to different workpiece to be welded.
It is therein, the double-deck pipeline, upper layer pipeline be useful for placing relay part to be welded put part section, with put part section tail endIt is connected and the welding section for being welded to workpiece and is connected to the pickup section of welding section tail end and lower layer's pipeline passes through headTwo lifting devices are arranged to form the pipeline of cyclic annular transmission section in tail.Soldered workpiece manually takes in pickup stationGo out, pallet enters the lifting device that lower layer's pipeline returns to left side by the lifting device of tail portion side, reenters and waits for welderIt awaits orders position.
The course of work：
Before welding, by transfer robot according to instruction, product tray, 300 kilograms of the robot load-bearing, working range are replaced3150mm, 7 axis high speed transfer robots, end are furnished with pallet handgrip, and gripping structure is secured, stable, and sliding is accurate, palletSize is 1300*1000*260mm, and weight is 150 kilograms, after going out storage or in the production line robot identification convenient for pallet,Welding procedure is replaced, bottom plate is made of Q235, and upper cover plate makes using 7075, corresponding position peace on each product tray assemblyThe radio frequency identification coding based on RFID technique is filled, after going out storage or in the production line robot identification convenient for pallet, replaces welderingConnect program.
Product tray is placed on the lifting device of part station side by the robot, in order to promote the speed of service, is adoptedIt is driven with the speed reducer of strap brake function, corresponding clump weight is set.Product tray is promoted to upper layer pipeline by lifting device, productionProduct pallet, which is transported to, puts part station, and manually workpiece to be welded is placed in product tray.It is artificial to pick and place part station, setting oneAir source plug-in connection is covered, to the secondary positioning of pallet, be convenient for the folding of pallet upper cover plate.
First product tray is replaced to part station is put, if this can be saved by not needing to change product tray successively by transfer robotStep has pallet using welding post.
Manually workpiece to be welded is put in placing member work station product pallet, closes upper cover plate, confirms that errorless rear start conveysLine, workpiece to be welded enter welding post, the buffer by each station and secondary detent mechanism location tray, welding robotIt identifies radio frequency encoding, starts welding procedure.Second product tray is returned by welding section tail end lifting device from lower layer's pipelineWelding ends head end lifting device is returned, pallet is transported to by lifting device puts part station, and worker places second workpiece to be welded, at this timeThe first welding sequence is completed in first workpiece to be welded, is delivered to the second welding sequence, and second workpiece to be welded enters the first welderingProcess is connect, carries out this step successively.
After the completion of five welding sequences, worker takes out finished product from pickup station, waits for next finished product.The production that will be vacatedProduct pallet is sent into lifting device.
The above is only a preferred embodiment of the present invention, it is noted that for the common skill of the artFor art personnel, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modificationsAlso it should be regarded as protection scope of the present invention.