CN111391238A

CN111391238A - Soft chip injection molding device based on light sensation control principle

Info

Publication number: CN111391238A
Application number: CN202010236511.9A
Authority: CN
Inventors: 周欢; 刘怡欢; 罗健斌
Original assignee: Changsha Liuteng Technology Co ltd
Current assignee: Changsha Liuteng Technology Co ltd
Priority date: 2020-03-30
Filing date: 2020-03-30
Publication date: 2020-07-10

Abstract

The invention relates to the technical field of chip processing and discloses an injection molding device of a soft chip based on a light sensation control principle, which comprises a first shell, wherein a feeding pipe is fixedly connected to the outside of the first shell, the top of the first shell is movably connected with a motor, the inside of the first shell is movably connected with a buffer structure, the outside of the buffer structure is movably connected with a transmission structure, the outside of the buffer structure is movably connected with a stirring structure, the inside of the first shell is movably connected with a vibration structure, the inside of the first shell is movably connected with a conduit, and the outside of the conduit is movably connected with a second shell; under the interact through between shell one, inlet pipe, motor, buffer structure, transmission structure, the stirring structure, can make when this device is moulding plastics before, can guarantee to mould plastics that liquid is in the state of stirring always, transmission between the structure can be so that the liquid of moulding plastics can be more abundant of stirring under the structure vibrations when the stirring, has guaranteed the normal use of the liquid of moulding plastics.

Description

Soft chip injection molding device based on light sensation control principle

Technical Field

The invention relates to the technical field of chip processing, in particular to an injection molding device for a soft chip based on a light sensation control principle.

Background

Injection molding is a method for producing and molding industrial products. The products are generally produced by rubber injection molding and plastic injection molding. The injection molding can be classified into injection molding and die casting. An injection molding machine is a main molding device for making thermoplastic plastics or thermosetting materials into plastic products with various shapes by using a plastic molding die, and the injection molding is realized by an injection molding machine and the die. Rubber injection molding is a production method in which rubber is directly injected from a cylinder into a mold for vulcanization. The rubber injection molding method has the advantages that although the method is intermittent, the molding period is short, the production efficiency is high, the blank preparation procedure is omitted, the labor intensity is low, and the product quality is excellent.

Along with the arrival of the intelligent era, the machine is more and more demanding to the chip, so the large batch production of chip has become the main problem, however, most of the existing injection molding machines for injecting plastic to soft chip have the problem of poor effect of stirring injection molding liquid, so the production of chip can be caused to be problematic, more defective products are caused, great influence is caused to producers and purchasers, and the existing injection molding machines rarely inject plastic to a plurality of chips, so the working efficiency of production is greatly reduced, the use cost is increased, certain influence is caused to the economic benefit of producers, and the development of factories is also restricted.

Therefore, in order to solve these problems, a soft chip injection molding device based on the light sensation control principle is needed.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides an injection molding device for soft chips based on a light sensation control principle, which has the advantages of sufficient stirring, light sensation control and quantitative injection molding of a plurality of chips, and solves the problem that most of the existing injection molding machines for injection molding of soft chips have poor injection molding liquid stirring effect, so that the production of chips is possibly caused to be problematic, more defective products are generated, great influence is caused to producers and purchasers, and the existing injection molding machines rarely perform injection molding on a plurality of chips, so that the working efficiency of production is greatly reduced, the use cost is increased, and the economic benefit of producers is influenced to a certain extent.

(II) technical scheme

In order to achieve the purposes of full stirring, light sensation control and quantitative injection molding of a plurality of chips, the invention provides the following technical scheme: the utility model provides a device of moulding plastics of soft chip based on light sense control principle, which comprises a housing I, the outside fixedly connected with inlet pipe of shell I, the top swing joint of shell I has the motor, the inside swing joint of shell I has buffer structure, buffer structure's outside swing joint has the transmission structure, buffer structure's outside swing joint has stirring structure, the inside swing joint of shell I has vibrations structure, the inside swing joint of shell I has the pipe, the outside swing joint of pipe has shell II, the inside swing joint of shell II has the centre gripping subassembly, the outside fixedly connected with ware of moulding plastics of shell II, the inside fixedly connected with groove of moulding plastics of shell I, the inside fixedly connected with lantern in the groove of moulding plastics, the inside fixedly connected with photosensitive assembly in the groove of moulding plastics.

Preferably, buffer structure mainly comprises shell three, movable block, spring one, and shell three is fixed in the inside of shell one, and the one end swing joint of spring one is in the inside of shell three, the other end of spring one and the outside swing joint of movable block, and movable block swing joint is in the inside of shell three, and buffer structure has four, the setting that corresponds is in the inside of shell one.

Preferably, transmission structure mainly comprises quarter butt, runner, track, stock, and the one end and the motor fixed connection of stock, track swing joint are in the outside of stock, and the outside swing joint of track has the runner, and the runner is through the outside swing joint of its inside fixed quarter butt and shell three.

Preferably, stirring structure mainly comprises bull stick, rotary drum, balancing weight, stirring rod, and inside the movable block of two buffer structure that correspond at the both ends difference swing joint of bull stick, balancing weight fixed connection is in the outside of bull stick, and rotary drum fixed connection is in the outside of bull stick, and stirring rod fixed connection is in the outside of bull stick, and the aperture has been seted up on the surface of rotary drum and is no less than five, the outside of bull stick and the inside swing joint of track.

Preferably, the vibrations structure mainly comprises stay cord, connecting rod, vibrations piece, spout, keeps away from the outside fixedly connected with stay cord of the movable block among two buffer structure at a shell top, and the one end swing joint that the movable block was kept away from to the stay cord has the connecting rod, and the outside swing joint of connecting rod is in the outside of shell three, shakes the inside of piece fixed connection at the spout, shakes the outside swing joint of piece and connecting rod, the specification of spout and the specification phase-match of the ware of moulding plastics.

Preferably, the clamping assembly mainly comprises a telescopic device, a clamping groove, a clamping rod, a second spring, a first connecting rod and a second connecting rod, the connecting rod III, the push rod, the movable groove is formed, the movable groove is fixed in the shell II, the push rod, the equal swing joint of the connecting rod I is in the movable groove, one end, far away from the movable groove, of the connecting rod I is connected with the connecting rod II and movably connected with the connecting rod III, one end, far away from the connecting rod I, of the connecting rod II is connected with the push rod movably, the outer portions of the clamping rod and the clamping groove are respectively connected with the two connecting rod III movably, one end, far away from the connecting rod I, of the connecting rod III is connected with the spring II, one end, close to the movable groove, of the clamping rod and the clamping groove is connected movably with the spring II, the specifications and the positions of the clamping rod and the clamping groove are matched with each other, the position and the specifications of the clamping groove are matched with.

Preferably, the inside of the injection molding device is movably connected with a guide pipe, the outside of the injection molding device is provided with an injection molding head, the outside of the guide pipe is provided with a branch guide pipe, and the injection molding heads, the branch guide pipes and the injection molding grooves are the same in number.

Preferably, the photosensitive assembly mainly comprises a shading shell, a transparent shell and a photosensitive resistor, the photosensitive resistor is fixed inside the shading shell, the transparent shell is embedded on the surface of the shading shell, and the specification of the transparent shell is matched with that of the small lamp.

Preferably, the motor is electrically connected with an external switch, the photoresistor is electrically connected with the expansion piece, and the expansion piece is electrically connected with the driving power supply.

(III) advantageous effects

Compared with the prior art, the invention provides an injection molding device of a soft chip based on a light sensation control principle, which has the following beneficial effects:

1. this device of moulding plastics of soft chip based on light sense control principle through under the interact between shell one, inlet pipe, motor, buffer structure, transmission structure, the stirring structure, can make when this device is moulding plastics before, can guarantee to mould plastics that liquid is in the state of stirring always, transmission between the structure can be so that when the stirring the liquid of moulding plastics can be more abundant of stirring under the structure vibrations, has guaranteed the normal use of the liquid of moulding plastics.

2. This device of moulding plastics of soft chip based on light sense control principle under the interact between stirring structure and the vibrations structure, can make the liquid of moulding plastics can not lead to the fact the jam owing to the excessive of the liquid of moulding plastics before getting into formal moulding plastics, has guaranteed the normal use of device.

3. This device of moulding plastics of soft chip based on light sense control principle, through the pipe, shell two, centre gripping subassembly, the ware of moulding plastics, the groove of moulding plastics, the lantern light, under the interact between the photosensitive assembly, can be so that under the characteristic of photo resistance, make the device can be quantitative mould plastics the chip, the specification of chip has been guaranteed, the reduction that also can by a wide margin of the output rate of substandard product, utilize a plurality of branch pipes and the head of moulding plastics can realize moulding plastics simultaneously a plurality of chips, the production efficiency of mill has been improved.

Drawings

FIG. 1 is a schematic cross-sectional view of the structure of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 at A according to the present invention;

FIG. 3 is a schematic view of the structure of FIG. 1 at B according to the present invention;

FIG. 4 is a schematic view of the structure of FIG. 1 at C according to the present invention;

FIG. 5 is a schematic structural view of a transmission structure of the present invention;

FIG. 6 is a schematic view of the connection structure between the conduit, the second housing and the clamping assembly according to the present invention.

In the figure: 1. a first shell; 2. a feed pipe; 3. a motor; 4. a buffer structure; 5. a transmission structure; 6. a stirring structure; 7. a vibrating structure; 8. a conduit; 9. a second shell; 10. a clamping assembly; 11. an injection molding machine; 12. injection molding a groove; 13. a small lamp; 14. a photosensitive element.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, an injection molding device for a soft chip based on a light sensation control principle comprises a first shell 1, wherein a feeding pipe 2 is fixedly connected to the outside of the first shell 1, a motor 3 is movably connected to the top of the first shell 1, a buffer structure 4 is movably connected to the inside of the first shell 1, the buffer structure 4 mainly comprises a third shell, a movable block and a first spring, the third shell is fixed to the inside of the first shell 1, one end of the first spring is movably connected to the inside of the third shell, the other end of the first spring is movably connected to the outside of the movable block, the movable block is movably connected to the inside of the third shell, and the number of the buffer structures 4 is four, and the four buffer structures are correspondingly arranged in the inside.

The outside of the buffer structure 4 is movably connected with a transmission structure 5, the transmission structure 5 mainly comprises a short rod, a rotating wheel, a crawler belt and a long rod, one end of the long rod is fixedly connected with the motor 3, the crawler belt is movably connected with the outside of the long rod, the outside of the crawler belt is movably connected with the rotating wheel, and the rotating wheel is movably connected with the outside of the shell III through the short rod fixed in the rotating wheel; the outer part of each buffer structure 4 is movably connected with a stirring structure 6, each stirring structure 6 mainly comprises a rotating rod, a rotating cylinder, a balancing weight and a stirring rod, two ends of each rotating rod are respectively movably connected inside the corresponding movable blocks in the two buffer structures 4, the balancing weight is fixedly connected to the outer part of each rotating rod, the rotating cylinders are fixedly connected to the outer parts of the rotating rods, the stirring rods are fixedly connected to the outer parts of the rotating rods, small holes are formed in the surfaces of the rotating cylinders, the number of the small holes is not less than five, and the outer parts of the rotating rods are movably connected with; through under the interact between shell 1, inlet pipe 2, motor 3, buffer structure 4, transmission structure 5, the stirring structure 6, can make when this device is moulding plastics before, can guarantee to mould plastics that liquid is in the state of stirring always, transmission between the structure can be so that when the stirring mould plastics that liquid can stir under the structure vibrations more abundant, has guaranteed the normal use of the liquid of moulding plastics.

The vibration structure 7 is movably connected inside the first shell 1, and injection molding liquid can not be blocked due to excessive injection molding liquid before entering formal injection molding through interaction between the stirring structure 6 and the vibration structure 7, so that normal use of the device is guaranteed. The inside swing joint of shell 1 has pipe 8, the outside swing joint of pipe 8 has shell two 9, the inside swing joint of shell two 9 has centre gripping subassembly 10, centre gripping subassembly 10 mainly by the expansion bend, the draw-in groove, the kelly, spring two, connecting rod one, connecting rod two, connecting rod three, the push rod, the movable groove is constituteed, the movable groove is fixed in the inside of shell two 9, the push rod, equal swing joint of connecting rod one is in the inside of movable groove, the one end and connecting rod two that the movable groove was kept away from to connecting rod one are swing joint, the one end and the connecting rod three swing joint of connecting rod one are kept away from to connecting rod two, the outside of kelly and draw-in groove respectively with two connecting rod three swing joints, the one end swing joint that connecting rod three was kept away from to connecting rod one is connected with spring two, the kelly and the one end that the draw-in groove is close to the movable groove all, The position and the specification of the clamping groove are matched, the top of the push rod is fixedly connected with the outside of the telescopic device, and one end, far away from the push rod, of the telescopic device is fixedly connected with the inside of the second shell 9.

The outer part of the second shell 9 is fixedly connected with an injection molding device 11, the vibration structure 7 mainly comprises a pull rope, a connecting rod, a vibration block and a sliding chute, the outer part of the movable block in the two buffer structures 4 far away from the top of the first shell 1 is fixedly connected with the pull rope, one end of the pull rope far away from the movable block is movably connected with the connecting rod, the outer part of the connecting rod is movably connected with the outer part of the third shell, the vibration block is fixedly connected with the inner part of the sliding chute, the vibration block is movably connected with the outer part of the connecting rod, and the specification of the; an injection molding groove 12 is fixedly connected inside the first shell 1, a guide pipe 8 is movably connected inside the injection molding device 11, an injection molding head is arranged outside the injection molding device 11, a branch guide pipe 8 is arranged outside the guide pipe 8, and the injection molding head, the branch guide pipe 8 and the injection molding groove 12 are the same in number; a small lamp 13 is fixedly connected inside the injection molding groove 12, and a photosensitive assembly 14 is fixedly connected inside the injection molding groove 12; the photosensitive component 14 mainly comprises a shading shell, a transparent shell and a photosensitive resistor, wherein the photosensitive resistor is fixed inside the shading shell, the transparent shell is embedded on the surface of the shading shell, and the specification of the transparent shell is matched with that of the small lamp 13; the motor 3 is electrically connected with an external switch, the photoresistor is electrically connected with the expansion piece, and the expansion piece is electrically connected with a driving power supply; through the pipe 8, the second shell 9, the clamping assembly 10, the injection molding device 11, the injection molding groove 12, the small lamp 13 and the photosensitive assembly 14, the interaction between the photosensitive resistor and the device can ensure that the device can quantitatively inject the chips, the specification of the chips is ensured, the output rate of defective products is greatly reduced, the injection molding of a plurality of chips can be realized by utilizing a plurality of branch pipes 8 and injection molding heads, and the production efficiency of a factory is improved.

The working process and principle are that when the device starts to be started, the outer part of a shell I1 is fixedly connected with a feeding pipe 2, the top of the shell I1 is movably connected with a motor 3, the inner part of the shell I1 is movably connected with a buffer structure 4, the outer part of the buffer structure 4 is movably connected with a transmission structure 5, the outer part of the buffer structure 4 is movably connected with a stirring structure 6, the inner part of the shell I1 is movably connected with a vibration structure 7, the buffer structure 4 mainly comprises a shell III, a movable block and a spring I, the shell III is fixed in the shell I1, one end of the spring I is movably connected in the shell III, the other end of the spring I is movably connected with the outer part of the movable block, the movable block is movably connected in the shell III, the number of the buffer structures 4 is four, the buffer structures are correspondingly arranged in the shell I1, the transmission structure 5 mainly, one end of the long rod is fixedly connected with the motor 3, the track is movably connected with the outside of the long rod, the outside of the track is movably connected with the rotating wheel, the rotating wheel is movably connected with the outside of the shell III through the short rod fixed in the rotating wheel, the stirring structure 6 mainly comprises a rotating rod, a rotating drum, balancing weights and stirring rods, two ends of the rotating rod are respectively movably connected with the inside of the movable block in the two corresponding buffer structures 4, the balancing weights are fixedly connected with the outside of the rotating rod, the rotating drum is fixedly connected with the outside of the rotating rod, the stirring rods are fixedly connected with the outside of the rotating rod, small holes are formed in the surface of the rotating drum and not less than five holes, the outside of the rotating rod is movably connected with the inside of the track, the vibration structure 7 mainly comprises a pull rope, a connecting rod, a vibration block and a sliding chute, the outside of the movable block in the, the outer part of the connecting rod is movably connected to the outer part of the shell III, the vibration block is fixedly connected to the inner part of the sliding groove, the vibration block is movably connected with the outer part of the connecting rod, the specification of the sliding groove is matched with that of the injection molding device 11, and the motor 3 is electrically connected with an external switch; the operator throws into the raw and other materials of moulding plastics through inlet pipe 2 this moment, and make motor 3 start through external switch, motor 3 starts and drives the track motion under the effect of stock, the track motion drives the bull stick and rotates, the bull stick is at the balancing weight, the effect of movable block and spring drives the rotary drum and shakes down, the bull stick rotates and to make stirring rod stirring liquid medicine, the track can not lead to the track slippage because the vibrations of bull stick under the effect of runner and quarter butt, and the motion of the movable block of keeping away from shell 1 top makes the stay cord motion, the stay cord motion makes the connecting rod and shakes the piece and contact and make and shake the piece vibrations, shake the piece vibrations and make the spout vibrations, make the liquid of moulding plastics flow out more fast.

Because the inside of the first shell 1 is movably connected with the guide pipe 8, the outside of the guide pipe 8 is movably connected with the second shell 9, the inside of the second shell 9 is movably connected with the clamping component 10, the outside of the second shell 9 is fixedly connected with the injection molding device 11, the inside of the first shell 1 is fixedly connected with the injection molding groove 12, the inside of the injection molding groove 12 is fixedly connected with the small lamp 13, the inside of the injection molding groove 12 is fixedly connected with the photosensitive component 14, the clamping component 10 mainly comprises the expansion bend, the clamping groove, the clamping rod, the spring II, the first connecting rod, the second connecting rod, the third connecting rod, the push rod and the movable groove, the movable groove is fixed in the second shell 9, the push rod and the first connecting rod are movably connected in the movable groove, one end of the first connecting rod, far away from the movable groove, is movably connected with the second connecting rod and the third connecting rod, one end of, one end of the third connecting rod far away from the first connecting rod is movably connected with a second spring, one ends of the clamping rod and the clamping groove close to the movable groove are movably connected with a second spring, specifications and positions of the clamping rod and the clamping groove are matched, the position and the specification of the conduit 8 are matched with those of the clamping rod and the clamping groove, the top of the push rod is fixedly connected with the outside of the telescopic device, one end of the telescopic device far away from the push rod is fixedly connected with the inside of the second shell 9, the inside of the injection device 11 is movably connected with the conduit 8, the outside of the injection device 11 is provided with an injection head, the outside of the conduit 8 is provided with a branch conduit 8, the injection head, the branch conduit 8 and the injection groove 12 are the same in number, the photosensitive assembly 14 mainly comprises a shading shell, a transparent shell and a photosensitive resistor, the photosensitive resistor is fixed inside the shading shell, the transparent shell is embedded on the surface of the shading shell, the expansion bend is connected with drive power supply electricity, the lantern light 13 is in the commentaries on classics state of lighting under the initial condition, the liquid of moulding plastics this moment is through flowing into the ware 11 of moulding plastics under the effect at pipe 8, and will mould plastics the liquid through the head of moulding plastics and pour into the groove 12 inside of moulding plastics, when the liquid of moulding plastics blocks the light of lantern light 13, the resistance changes after the light of corresponding photo resistance response not to lantern light 13, can make the expansion bend shrink this moment, the expansion bend drives the push rod motion, the push rod motion drives connecting rod two and connecting rod one motion under the effect of activity groove, connecting rod one and connecting rod two's motion drive connecting rod three motions, connecting rod three motions drive kelly and draw-in groove motion under the effect of spring two, make kelly and draw-in groove with pipe 8 chucking, it stops to mould.

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.

Claims

1. The utility model provides a soft chip's device of moulding plastics based on light sense control principle, includes shell one (1), its characterized in that: the device comprises a shell I (1), an inlet pipe (2) fixedly connected to the outside of the shell I (1), a motor (3) movably connected to the top of the shell I (1), a buffer structure (4) movably connected to the inside of the shell I (1), a transmission structure (5) movably connected to the outside of the buffer structure (4), a stirring structure (6) movably connected to the outside of the buffer structure (4), a vibration structure (7) movably connected to the inside of the shell I (1), a guide pipe (8) movably connected to the inside of the shell I (1), a shell II (9) movably connected to the outside of the guide pipe (8), a clamping assembly (10) movably connected to the inside of the shell II (9), an injection molding device (11) fixedly connected to the outside of the shell II (9), an injection molding groove (12) fixedly connected to the inside of the shell I (1), and a small lamp (13) fixedly, the inside of the injection molding groove (12) is fixedly connected with a photosensitive component (14).

2. The light sensation control principle-based injection molding device for the soft chip as claimed in claim 1, wherein: buffer structure (4) mainly comprise shell three, movable block, spring one, and shell three is fixed in the inside of shell one (1), and the one end swing joint of spring one is in the inside of shell three, the other end of spring one and the outside swing joint of movable block, and movable block swing joint is in the inside of shell three, and buffer structure (4) have four, and the setting that corresponds is in the inside of shell one (1).

3. The light sensation control principle-based injection molding device for the soft chip as claimed in claim 1, wherein: drive structure (5) mainly comprise quarter butt, runner, track, stock, the one end and motor (3) fixed connection of stock, track swing joint is in the outside of stock, the outside swing joint of track has the runner, the runner is through its inside fixed quarter butt and the outside swing joint of shell three.

4. The light sensation control principle-based injection molding device for the soft chip as claimed in claim 1, wherein: stirring structure (6) mainly comprise bull stick, rotary drum, balancing weight, stirring rod, and inside the movable block of the both ends difference swing joint of bull stick in two buffer structure (4) that correspond, balancing weight fixed connection is in the outside of bull stick, and rotary drum fixed connection is in the outside of bull stick, and stirring rod fixed connection is in the outside of bull stick, and the aperture has been seted up on the surface of rotary drum and is no less than five, the outside of bull stick and the inside swing joint of track.

5. The light sensation control principle-based injection molding device for the soft chip as claimed in claim 1, wherein: vibrations structure (7) mainly comprise stay cord, connecting rod, vibrations piece, spout, keeps away from the outside fixedly connected with stay cord of the movable block in two buffer structure (4) at shell (1) top, and the one end swing joint that the movable block was kept away from to the stay cord has the connecting rod, and the outside swing joint of connecting rod is in the outside of shell three, shakes a fixed connection in the inside of spout, shakes the outside swing joint of piece and connecting rod, the specification phase-match of the specification of spout and the ware (11) of moulding plastics.

6. The light sensation control principle-based injection molding device for the soft chip as claimed in claim 1, wherein: the clamping component (10) mainly comprises a telescopic device, a clamping groove, a clamping rod, a spring II, a connecting rod I and a connecting rod II, the connecting rod III, the push rod, the movable groove is constituteed, the movable groove is fixed in the inside of shell two (9), the push rod, the equal swing joint of connecting rod I is in the inside of movable groove, the one end and connecting rod II that connecting rod I kept away from the movable groove, connecting rod three swing joint, the one end and the push rod swing joint of connecting rod I are kept away from to connecting rod II, the outside of kelly and draw-in groove respectively with two connecting rod three swing joints, the one end swing joint that connecting rod I was kept away from to connecting rod III has spring II, the equal swing joint of one end that kelly and draw-in groove are close to the movable groove has spring II, the specification and the position phase-match of kelly and draw-in groove, the position and the specification and the kelly of pipe (8) and draw-in groove, the position and the specification phase-match of draw-.

7. The light sensation control principle-based injection molding device for the soft chip as claimed in claim 1, wherein: the injection molding machine is characterized in that a guide pipe (8) is movably connected inside the injection molding machine (11), an injection molding head is arranged outside the injection molding machine (11), a branch guide pipe (8) is arranged outside the guide pipe (8), and the injection molding heads, the branch guide pipe (8) and the injection molding grooves (12) are the same in quantity.