CN114447209A - Manufacturing device and method for artificial muscle wrapped and twisted by sheath material - Google Patents
Manufacturing device and method for artificial muscle wrapped and twisted by sheath material Download PDFInfo
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- CN114447209A CN114447209A CN202210132607.XA CN202210132607A CN114447209A CN 114447209 A CN114447209 A CN 114447209A CN 202210132607 A CN202210132607 A CN 202210132607A CN 114447209 A CN114447209 A CN 114447209A
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Abstract
The invention belongs to the field of preparation and application of artificial muscle type flexible drivers, and particularly relates to a device and a method for manufacturing artificial muscle coated and twisted by a sheath material. The invention realizes two work steps of twisting the sheath-core artificial muscle and wrapping sheath materials by controlling the coordinated operation of three groups of motors, and realizes the automatic manufacture of the sheath-core artificial muscle. The invention simplifies the preparation process of the sheath-core artificial muscle, improves the manufacturing efficiency of the sheath-core artificial muscle and simultaneously realizes the controllability of the parameters of the sheath-core artificial muscle. The invention is expected to promote the automatic production of sheath-core artificial muscles and sheath-core structural materials.
Description
Technical Field
The invention belongs to the field of preparation and application of artificial muscle type flexible drivers, and particularly relates to a device and a method for manufacturing artificial muscle coated and twisted by a sheath material.
Background
In recent years, artificial muscles having high flexibility and high output have been applied to advanced fields such as medical rehabilitation devices and biomimetic robots. The existing artificial muscle generally has a pneumatic type artificial muscle, and the principle of the existing artificial muscle is to change the pressure inside a cavity body so as to enable the artificial muscle to contract or expand to drive a corresponding motion part; the disadvantages are that: needs external pneumatic equipment 9, has larger volume and weight and is not easy to carry. The dielectric elastomer artificial muscle has the principle that when an electric field is applied, the charges of the elastomer are mutually extruded or repelled to generate deformation; the disadvantage is that very high applied voltages are used, increasing the risk of use. Thin film flexure actuators made of Ionic Polymer Metal Composites (IPMC) tend to have lower output forces.
CN111390895A discloses an artificial muscle module with a dielectric elastomer spring structure and a manufacturing method thereof. The disadvantages are that: the circuit voltage is very high, and the safety faces great challenges; the spring and dielectric elastomer are in a resistive relationship and the drive performance of the dielectric elastomer is lost.
CN102044627A discloses electrostrictive composite materials and electrostrictive elements which are in the shape of sheets and actuated in a curved manner, which limits the application in the field of artificial muscles or actuators. CN102044627A does not mention the magnitude of the output force of the actuator, which determines the type of device it can drive, and the temperature range of the actuator deformation, and it is very important to control the deformation temperature because the melting temperature of the polymer is relatively low.
CN202010881926.1 discloses an electrostrictive spiral artificial muscle and its preparation and application, but it cannot realize automatic twisting. The actuator structure designed by the invention is of a spiral type, and the actuation mode is contraction, so that the invention is more widely applied to the field of artificial muscles or actuation.
Disclosure of Invention
Aiming at the problems of uneven wrapping of a sheath material, unfixed twisting angle and the like in the manufacture of the sheath-core structure artificial muscle, the invention provides a manufacturing device of the sheath-core artificial muscle (structure), which can synchronously carry out twisting and sheath material wrapping. The invention simplifies the preparation process of the sheath-core artificial muscle, improves the manufacturing efficiency of the sheath-core artificial muscle and simultaneously realizes the controllability of the parameters of the sheath-core artificial muscle. The invention is expected to promote the automatic production of sheath-core artificial muscles and sheath-core structural materials.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a twisting wraps up in with sheath material and covers artifical muscle (structure) making devices of sheath core that can go on in step, including bottom plate, step motor I base, shaft coupling, step motor II, slide rail motor cabinet, step motor III base, the vice I, connecting seat, screw-nut supporting platform, feeding platform, screw-nut is vice II, step motor IV base, the control unit I, the control unit II, the control unit III.
The coaxial rotating part consists of a stepping motor I, a stepping motor II, a stepping motor base I, a sliding rail motor base, a coupler and a control unit I thereof, wherein the stepping motor I is fixedly connected with the bottom plate through a base of the stepping motor I, and the stepping motor II is arranged in a track of the bottom plate through the sliding rail motor base and is connected with the bottom plate in a sliding manner; output shafts of the stepping motor I and the stepping motor II are connected with two ends of the fixed core wire through a coupler and are used for driving the core wire to rotate and twist; the sliding rail motor base is installed in a sliding rail of the bottom plate and used for adjusting the horizontal movement of the stepping motor II, firstly, the motor can move along with the shortening of the length of the artificial muscle when the artificial muscle is twisted in order to adjust the original length of the core wire, so that the applicability of the device is improved, and secondly, the motor can move along with the shortening of the length of the artificial muscle, and the artificial muscle is prevented from being torn due to overlarge axial tensile stress when the artificial muscle is twisted too tightly.
The contraction translation part consists of a stepping motor III, a base of the stepping motor III and a control unit II, and an output shaft of the stepping motor III is connected with a screw rod of the screw rod nut pair I through a coupler and used for driving the screw rod to rotate.
Screw-nut pair I constitute by trapezoidal thread lead screw and corresponding nut, nut and slide rail motor cabinet fixed connection, the bottom plate restriction slide rail motor cabinet is rotatory, can drive the slide rail motor cabinet through the nut and carry out horizontal migration when the lead screw is rotatory.
The feeding part consists of a stepping motor IV, a stepping motor IV base and a control system III, and an output shaft of the stepping motor IV is connected with a screw rod of a screw rod nut pair II through a coupler and used for driving the screw rod to rotate.
One end of the connecting seat is connected with the bottom plate and used as a supporting column of the bottom plate, and the other end of the connecting seat is groove-shaped and used for installing and fixing the lead screw nut pair supporting platform.
The screw-nut pair supporting platform is provided with three horizontal rails on the side surface and the top surface, two horizontal rails on the side surface and one horizontal rail on the top surface, and nuts are placed in the side rails, connected with the groove structures of the connecting seats through bolts and used for fixing the supporting platform; the top surface track is connected with the feeding platform to limit the rotational freedom of the feeding platform.
The lower end of the feeding platform is connected with a screw nut pair supporting platform through a sliding rail, and the central part of the feeding platform is fixedly connected with a screw nut pair II; the feed screw nut provides driving force for the feed screw nut, the slide rail restrains the feed platform to rotate and simultaneously performs slide guiding, the feed platform carries sheath materials to perform horizontal movement, and the sheath materials are uniformly covered to the other end from one end of the core wire.
The control units I, II and III are controlled by a single chip microcomputer, and the control unit I respectively provides different or same rotating speed control for the stepping motor I and the stepping motor II; the control unit II is used for controlling the steering and rotating speed of the stepping motor III and realizing the horizontal movement of the stepping motor II by driving the lead screw nut pair I; and the control unit III is used for controlling the steering and rotating speed of the stepping motor IV and realizing the horizontal movement of the feeding platform by driving the screw-nut pair II.
For the manufacturing technology of the sheath-core structure artificial muscle, the invention has the beneficial effects that: the control unit I controls the rotating speeds of the stepping motor I and the stepping motor II, namely controls the rotating speed of the core wire and the twisting speed of the sheath-core structure artificial muscle, so that the sheath layer material wrapping speed and the twisting twist degree are accurately controlled. And the control unit II controls the rotation direction and the rotation speed of the stepping motor III and provides proper horizontal moving speed for the stepping motor II in the twisting process. And the control unit III controls the rotation direction and the rotation speed of the stepping motor IV so as to control the horizontal moving speed of the wire feeding platform. The working distance from the wire feeding platform to the central shaft core wire is adjusted by changing the length parameter of the connecting seat. The parameters of the prepared sheath core artificial muscle can be controlled by setting the parameters of the control units I, II and III, the center distance between the stepping motor I and the stepping motor II, the screw pitch of the screw rod and the wrapping angle of the material feeding to the core wire. The invention provides a sheath-core artificial muscle (structure) manufacturing device capable of synchronously twisting and sheath material wrapping, which realizes the flexible control of the twisting of the sheath-core artificial muscle and the wrapping of the sheath material simultaneously or sequentially through the coordinated operation of three groups of motor-driven control simple mechanisms, realizes the automation of the manufacturing of the sheath-core artificial muscle, improves the manufacturing efficiency of the sheath-core artificial muscle and ensures the controllable parameters of the sheath-core artificial muscle.
Drawings
Fig. 1 is a construction view of a sheath-core structure artificial muscle manufacturing apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the apparatus for preparing a CNT @ nylon sheath-core structure;
fig. 3 is a schematic structural view of the connecting socket 12;
in the figure, 1-base plate; 2-a base of a stepping motor I; 3-a step motor I; 4-coupling I; 5-a screw-nut pair I; 6-coupler II; 7-step motor II; 8-a sliding rail motor base; 9-coupler III; 10-step motor III; 11-a base of a stepping motor III; 12-a connecting seat; 13-a screw-nut pair supporting platform; 14-screw nut pair II; 15-a feeding platform; 16-a coupler IV; 17-a stepper motor IV base; 18-step motor IV; 19-carbon nanotube film; 20-nylon thread.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The sheath material used in the examples was carbon nanotubes and the core material was nylon thread.
Fig. 1 shows a preferred embodiment of the sheath-core structure artificial muscle manufacturing device, which is capable of synchronously performing twisting and sheath material wrapping, and comprises a bottom plate 1, a base 2 of a stepping motor i, a stepping motor i 3, a screw-nut pair i 5, a stepping motor ii 7, a sliding rail motor base 8, a stepping motor iii 10, a base 11 of a stepping motor ii, a connecting base 12, a screw-nut pair supporting platform 13, a screw-nut pair ii 14, a feeding platform 15, a base 17 of a stepping motor iv, a stepping motor iv 18, a control unit i, a control unit ii, and a control unit iii.
Coaxial rotating part comprises step motor I3, step motor II 7, I base 2 of step motor, slide rail motor cabinet 8, shaft coupling I4, shaft coupling II 6 and the control unit I, and step motor I3 passes through I base 2 of step motor and 1 fixed connection of bottom plate, and step motor II 7 is connected with slide rail motor cabinet 8, and slide rail motor cabinet 8 is installed in the slip track of bottom plate 1. Output shafts of the stepping motor I and the stepping motor II are respectively connected with two ends of the fixed core wire through a coupler 4 and a coupler 6 and are used for driving the core wire to rotate and twist; sliding connection seat 8 is used for adjusting step motor II 7's horizontal migration, firstly can adjust in order to make the original length of heart yearn, improves the suitability of device, and secondly the motor can move along with the length shortening of artificial muscle when artificial muscle twists, prevents when twisting overtightness, and the artificial muscle receives the axial tensile stress too big and tears.
The contraction translation part consists of a stepping motor III 10, a stepping motor base 11, a coupler 9 and a control unit II, and an output shaft of the stepping motor III 10 is connected with a screw rod of a screw rod nut pair I5 through the coupler III 9 and used for driving the screw rod to rotate.
Screw-nut pair I5 constitute by trapezoidal thread lead screw and corresponding nut, nut and 8 fixed connection of slide rail motor cabinet, bottom plate 1 restriction slide rail motor cabinet 8 is rotatory, can drive slide rail motor cabinet 8 through the nut and carry out horizontal migration when the lead screw is rotatory.
The feeding part consists of a stepping motor IV 18, a stepping motor base 17, a coupler 16 and a control unit III, and an output shaft of the stepping motor IV 18 is connected with a screw rod of a screw rod nut pair II 14 through the coupler IV 16 and used for driving the screw rod to rotate.
One end of the connecting seat 12 is connected with the bottom plate and used as a supporting column of the bottom plate, and the other end of the connecting seat is groove-shaped and used for installing and fixing the lead screw nut pair supporting platform 13.
The lead screw nut pair supporting platform 13 is provided with three horizontal rails on the side surface and the top surface, nuts are placed in the rails on the side surface, and are connected with the groove structure of the connecting seat 12 through bolts for fixing the supporting platform; the top surface rail is connected with the feeding platform 15 to limit the rotational freedom of the feeding platform 15.
The lower end of the feeding platform 15 is connected with a screw nut pair supporting platform 13 through a slide rail, and the central part of the feeding platform is fixedly connected with a screw nut pair II 14; the feed screw nut pair II 14 provides driving force for the feed screw nut pair, the sliding rail restrains the feed platform 15 from rotating and simultaneously conducts sliding guide, the feed platform carries sheath materials to horizontally move, and the sheath materials are uniformly covered from one end of a core wire to the other end of the core wire.
The control units I, II and III are controlled by a single chip microcomputer, and the control unit I respectively provides different or same rotating speed control for the stepping motor I3 and the stepping motor II 7; the control unit II is used for controlling the steering and rotating speed of the stepping motor III 10 and realizing the horizontal movement of the stepping motor II 7 by driving the screw-nut pair I5; and the control unit III is used for controlling the steering and rotating speed of the stepping motor IV 18 and realizing the horizontal movement of the feeding platform 15 by driving the screw-nut pair II 14.
As shown in fig. 2, the schematic diagram of the CNT @ nylon sheath-core structure preparation process performed by the apparatus includes a sheath material carbon nanotube film (CNT Forest)19, a core wire nylon wire 20, a material feeding platform 15, a coupler ii 6, and a lead screw nut pair ii 14. The structural parameters of the prepared CNT @ nylon sheath-core artificial muscle sheath-core ratio, the twist, the length and the like can be controllably changed by determining the relationship among the parameters of the central shaft rotating speed, the screw rod driving rotating speed, the screw rod pitch, the wrapping angle alpha of the CNT film to the nylon wire, the diameter of the nylon wire and the like.
The specific preparation process and parameter calculation process are as follows:
two ends of a nylon wire 20 are respectively fixed on the coupler I4 and the coupler II 6, a carbon nanotube Forest (CNT Forest) is fixed on the feeding platform 15, and the led-out carbon nanotube film 19 is led out and attached to one end, close to the coupler I4, of the nylon wire 20. In the first stage, the stepping motor I3, the stepping motor II 7 and the stepping motor IV 18 work simultaneously, the stepping motor I3 and the stepping motor II 7 rotate coaxially at the same rotating speed, so that the carbon nanotube film 19 is wrapped on the surface of the nylon wire, and meanwhile, the stepping motor IV 18 drives the screw-nut pair II 14 to drive the feeding platform 15 to translate at a constant speed, so that the carbon nanotube film 19 is uniformly wrapped from one end of the nylon wire to the other end of the nylon wire. And in the second stage, after the carbon nanotube film is coated, the stepping motor I3, the stepping motor II 7 and the stepping motor III 10 work simultaneously, the stepping motor I3 and the stepping motor II 7 rotate coaxially at different speeds to twist the nylon wire coating the carbon nanotube, and the stepping motor III 10 drives the screw-nut pair I5 to drive the sliding rail motor seat 8 and the stepping motor II 7 to horizontally move along with the axial shortening of the nylon wire of the carbon nanotube until the nylon wire coating the carbon nanotube completely forms a spiral structure.
To meet the requirement of parameter calculation process explanation, let point a be any point on the nylon wire (core wire) 20, and the rotation speed of the nylon wire (core wire) 20 be n1(r/s) and the rotating speed of the stepping motor I3 is n11(r/s) and the rotating speed of the stepping motor II 7 is n12(r/s) and the rotating speed of the stepping motor IV 18 is n2(r/s) the horizontal moving speed of the carbon nanotube film 19 on the nylon wire (core wire) 20 is v1(mm/s), the horizontal moving speed v of the carbon nano tube film 19 driven by the feeding platform 15 is2(mm/s), the wrapping angle alpha (degree) of the carbon nanotube film 19 to the nylon thread, and the width of the carbon nanotube film 19 is x1(mm), the pasting length of the carbon nanotube film 19 on the nylon wire is d (mm), and the carbon nanotube film 19 is covered on the nylon wire (core wire) for a circle with a horizontal moving distance of x1(mm), nylonThe diameter of the thread (core thread) 20 is D, the wrapping layer number of the nylon thread (core thread) 20 is z (layer), and the screw pitch of the screw-nut pair II 14 is s2(mm), twist number S (T/m), length L (mm) of nylon thread (core thread) 20.
To determine the rotation speed n of the central shaft1(r/s) screw drive rotation speed n2(r/s) and lead screw pitch s2(mm), the wrapping angle alpha of the CNT film to the nylon wire, and the algebraic relation of the diameter D of the nylon wire.
The assumption of the convention is that:
1. the time t when the CNT film passes through the point a on the nylon thread (core thread) is the wrapping time at the point a, and the number z of wrapping layers is estimated.
2. To ensure the coating uniformity, the angle α needs to be kept constant, which requires that the CNT horizontal moving speed v1 on the nylon wire (core wire) be equal to the moving distance v2 of the screw platform.
Solution:
after the lapse of the time t,
the horizontal moving distance of the CNT film on the nylon string is as follows: l1＝v1t＝n1t s1；
The horizontal moving distance of the CNT Forest driven by the screw rod platform is as follows: l2＝v2t＝n2t s2；
Namely:
to equalize the speeds: v. of1＝v2Obtaining:
the following steps are provided:
and (4) calculating the layer number:
let a be sin α ∈ (0,1), and obtain:
calculating the twist of the sheath core structure artificial muscle:
the rotation speed n of the central shaft is determined by the formula (1) and the formula (2)1(r/s) step motor IIIn2(r/s) and lead screw nut pair II pitch s2(mm), the wrapping angle alpha of the carbon nano tube film to the nylon wire, and the algebraic relation of the diameter D of the nylon wire. And determining the corresponding relation between the electric control parameters of the control units I and II, the center distance between the stepping motor I3 and the stepping motor II 7, the thread pitch of the screw-nut pair II, the wrapping angle of the carbon nano tube film on the nylon wire and the parameters of the prepared sheath core artificial muscle.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (5)
1. A manufacturing device for artificial muscles coated and twisted by sheath materials is characterized by comprising a bottom plate, a stepping motor I, a base of the stepping motor I, a coupler, a stepping motor II, a sliding rail motor base, a stepping motor III, a base of the stepping motor III, a screw-nut pair I, a connecting base, a screw-nut supporting platform, a feeding platform, a screw-nut pair II, a stepping motor IV, a base of the stepping motor IV, a control unit I, a control unit II and a control unit III; the stepping motor I is fixedly connected with the bottom plate through the base of the stepping motor I, and the stepping motor II is installed in a track of the bottom plate through the sliding rail motor base and is in sliding connection with the bottom plate; output shafts of the stepping motor I and the stepping motor II are connected with two ends of the fixed core wire through a coupler and are used for driving the core wire to rotate and twist; the sliding rail motor base is arranged in a sliding rail of the bottom plate and used for adjusting the horizontal movement of the stepping motor II, so that the original length of the core wire can be adjusted, the applicability of the device is improved, and the motor can move along with the shortening of the length of the artificial muscle when the artificial muscle is twisted, so that the artificial muscle is prevented from being torn due to overlarge axial tensile stress when the artificial muscle is twisted too tightly; an output shaft of the stepping motor III is connected with a screw rod of the screw rod nut pair I through a coupler and is used for driving the screw rod to rotate; the connecting seat is used for connecting the supporting bottom plate and installing and fixing the lead screw nut pair supporting platform; the lower end of the feeding platform is connected with a screw nut pair supporting platform through a sliding rail, and the central part of the feeding platform is fixedly connected with a screw nut pair II; the screw rod nut provides driving force for the feeding platform, the sliding rail restrains the feeding platform to rotate and simultaneously performs sliding guide, so that the feeding platform carries sheath materials to horizontally move, and the sheath materials are uniformly covered from one end of a core wire to the other end; the control units I, II and III are controlled by a single chip microcomputer, and the control unit I respectively provides different or same rotating speed control for the stepping motor I and the stepping motor II; the control unit II is used for controlling the steering and rotating speed of the stepping motor III and realizing the horizontal movement of the stepping motor II by driving the screw-nut pair I; and the control unit III is used for controlling the steering and rotating speed of the stepping motor IV and realizing the horizontal movement of the feeding platform by driving the screw-nut pair II.
2. The apparatus for making artificial muscle with sheath material wrapped and twisted according to claim 1, wherein one end of the connecting base is connected with the bottom plate to serve as a supporting column of the bottom plate, and the other end is grooved to be used for installing and fixing the lead screw nut pair supporting platform.
3. The device for making artificial muscle wrapped and twisted by sheathing material according to claim 1, wherein the screw-nut pair support platform is provided with three horizontal rails of a side surface and a top surface, two horizontal rails of a side surface and one horizontal rail of a top surface, nuts are placed in the rails of the side surface, and are connected with the groove structures of the connecting seats through bolts for fixing the support platform; the top surface track is connected with the feeding platform to limit the rotational freedom of the feeding platform.
4. The method for preparing the artificial muscle wrapped and twisted by the sheath material by using the manufacturing device as claimed in claim 1 is characterized by comprising the following specific steps: two ends of a core wire are respectively fixed on the coupler I and the coupler II, a sheath material is fixed on the feeding platform, and the led-out sheath material is led out and attached to one end, close to the coupler I, of the core wire; in the first stage, a stepping motor I, a stepping motor II and a stepping motor IV work simultaneously, the stepping motor I and the stepping motor II rotate coaxially at the same rotating speed to wrap sheath materials on the surface of a core wire, and meanwhile, the stepping motor IV drives a lead screw nut pair II to drive a feeding platform to translate at a constant speed so that the sheath materials are uniformly wrapped from one end of the core wire to the other end; the second stage, the sheath material wraps up in and covers the completion back, step motor I, step motor II, III simultaneous workings of step motor, step motor I, II coaxial not fast rotations of step motor, twist the heart yearn of parcel sheath material, step motor III drive screw-nut is vice I drives slide rail motor cabinet and step motor II and carries out horizontal migration along with the heart yearn axial shortening of parcel sheath material, until the heart yearn of parcel sheath material forms helical structure completely, thereby obtain artifical muscle.
5. The method of claim 4,
let point a be any point on the core wire, the core wire rotation speed be n1(r/s) and the rotating speed of the stepping motor I is n11(r/s) and the rotating speed of the stepping motor II is n12(r/s) and the rotating speed of a stepping motor IV is n2(r/s) and the horizontal moving speed of the sheath material on the core wire is v1(mm/s), the horizontal moving speed of the core wire driven by the feeding platform is v2(mm/s), a wrap angle α (°) of the sheath material to the core wire, and a width x of the sheath material1(mm), the attaching length of the sheath material on the core wire is d (mm), the sheath material is wrapped on the core wire for a circle, and the horizontal moving distance is x1(mm), the diameter of the core wire is D, the number of the core wire wrapping layers is z (layer), and the screw pitch of the screw-nut pair II 14 is s2(mm), twist number S (T/m), core length L (mm);
to determine the rotation speed n of the central shaft1(r/s) screw drive rotation speed n2(r/s) and lead screw pitch s2(mm), the wrapping angle alpha of the carbon nano tube film to the core wire and the algebraic relation of the diameter D of the core wire;
the assumption of the convention is that:
1. the time t when the sheath material crosses the point a on the core wire is the wrapping time of the point a, and therefore the number z of wrapping layers is calculated;
2. in order to ensure the coating uniformity, the angle alpha needs to be kept constant, which needs to make the horizontal moving speed v1 of the sheath material on the core wire equal to the moving distance v2 of the screw rod platform;
solution:
after the lapse of the time t,
the horizontal travel distance of the sheath material on the core wire is: l1＝v1t＝n1t s1；
The horizontal moving distance of the CNT Forest driven by the screw rod platform is as follows: l2＝v2t＝n2t s2；
Namely:
v2＝n2s2；
to equalize the speeds: v. of1＝v2Obtaining:
the following steps are provided:
and (4) calculating the layer number:
let a ═ sin α ∈ (0,1), we get:
calculating the twist of the sheath core structure artificial muscle:
the rotation speed n of the central shaft is determined by the formula (1) and the formula (2)1(r/s) step motor IIIn2(r/s) and lead screw nut pair II pitch s2(mm), the wrapping angle alpha of the sheath material to the core wire, and the algebraic relation of the diameter D of the core wire; and determining the corresponding relation between the electric control parameters of the control units I and II, the center distance between the stepping motor I and the stepping motor II, the screw pitch of the screw-nut pair II, the wrapping angle of the sheath material to the core wire and the parameters of the prepared sheath core artificial muscle.
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| CN112201744A (en) * | 2020-08-27 | 2021-01-08 | 东华大学 | Electrostrictive spiral artificial muscle and preparation and application thereof |
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2021
- 2021-06-25 CN CN202110712231.5A patent/CN113675331A/en active Pending
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- 2022-02-14 CN CN202210132607.XA patent/CN114447209B/en active Active
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| CN113675331A (en) | 2021-11-19 |
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