CN113798158A - Reciprocating mechanism combining characteristics of shape memory polymer - Google Patents
Reciprocating mechanism combining characteristics of shape memory polymer Download PDFInfo
- Publication number
- CN113798158A CN113798158A CN202111068800.3A CN202111068800A CN113798158A CN 113798158 A CN113798158 A CN 113798158A CN 202111068800 A CN202111068800 A CN 202111068800A CN 113798158 A CN113798158 A CN 113798158A
- Authority
- CN
- China
- Prior art keywords
- shape memory
- memory polymer
- sliding table
- connecting plate
- movable sliding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229920000431 shape-memory polymer Polymers 0.000 title claims abstract description 122
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 238000005452 bending Methods 0.000 claims abstract description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 10
- 230000008602 contraction Effects 0.000 claims description 4
- 125000004122 cyclic group Chemical group 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 238000007639 printing Methods 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 239000004626 polylactic acid Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/10—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy
- B06B1/12—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy operating with systems involving reciprocating masses
- B06B1/14—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy operating with systems involving reciprocating masses the masses being elastically coupled
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Micromachines (AREA)
Abstract
The invention discloses a reciprocating mechanism combining the characteristics of a shape memory polymer. A guide rail is arranged in the rack, a movable sliding table is slidably arranged on the guide rail, a connecting plate is fixedly arranged on the movable sliding table, and two sides of the connecting plate are respectively connected with two sides in the rack through a shape memory part; each shape memory part mainly comprises a shape memory polymer and a heating module, the shape memory polymer is arranged in an S shape, the heating module is arranged inside the S-shaped semicircular arc bending corner of the shape memory polymer, and two ends of the shape memory polymer are respectively connected to the side part of the connecting plate and the inner side part of the frame. The device can realize the reciprocating movement of the mechanism by utilizing the dynamic cyclic reciprocating change of the shape memory polymer without a complex control assembly. The device can overcome the defects that the traditional reciprocating mechanism is difficult to control, more control components and the like.
Description
Technical Field
The invention belongs to the technical field of 4D printing, and relates to a mechanism capable of realizing circular reciprocating movement by utilizing a 4D printing technology, in particular to a reciprocating mechanism combining the characteristics of a shape memory polymer.
Background
The reciprocating mechanism has wide application in the field of mechanical production and machining, including various machine tools, various agricultural machines, aerospace and other fields which are commonly used in mechanical machining. At present, the common reciprocating mechanism comprises a cam mechanism, a plane four-bar mechanism, an incomplete gear mechanism, a sheave mechanism, a ratchet mechanism, a piston cylinder in hydraulic pressure and the like. The working principle of the traditional reciprocating mechanism is that electric energy and hydraulic energy are mainly used as energy sources to drive the mechanism to realize reciprocating deflection motion or reciprocating linear motion. In the motion process of the conventional mechanical mechanism for realizing reciprocating motion, the pressure is high, and the abrasion is serious; the complex motion mechanism has higher processing difficulty and higher processing cost; secondly, the control assembly of the mechanism is large, the cost is high, and the space area occupied by the control assembly is large.
Disclosure of Invention
Aiming at the defects of the traditional reciprocating mechanism, the invention provides a reciprocating mechanism combining the characteristics of shape memory polymers. The invention relates to a reciprocating mechanism which is designed by 4D printing thermal drive and combines the characteristics of a shape memory polymer. The thermal driving mode is mainly applied to shape memory alloy and thermosensitive shape memory polymer, and the shape memory effect of the shape memory alloy and the thermosensitive shape memory polymer is respectively derived from the glass transition or the melting transition of molecular chain composition units and the martensite forward-reverse phase transition. The device of the invention has simple structure and control mode, low cost, high efficiency and small space used by the mechanism.
The device mainly solves the problems that the traditional reciprocating mechanism has larger pressure and more serious abrasion in the motion process; the complex motion mechanism has the problems of high processing difficulty, high processing cost and large occupied space, and the traditional control assembly has a complex structure and occupies a large space.
The technical scheme adopted by the device for solving the technical problems is as follows:
a reciprocating mechanism incorporating the properties of a shape memory polymer:
comprises a frame, a movable sliding table, a shape memory part, a guide rail and a connecting plate; a guide rail is arranged in the rack, a movable sliding table is slidably arranged on the guide rail, a connecting plate is fixedly arranged on the movable sliding table, and two sides of the connecting plate are respectively connected with two sides in the rack through a shape memory part; each shape memory part mainly comprises a shape memory polymer and a heating module, the shape memory polymer is arranged in an S shape, the heating module is arranged inside the S-shaped semicircular arc bending corner of the shape memory polymer, and two ends of the shape memory polymer are respectively connected to the side part of the connecting plate and the inner side part of the frame.
The heating module adopts a resistance silver wire, and the resistance silver wire is arranged inside or on the inner side of the shape memory polymer in an embedding mode.
The movable sliding table is matched with the guide rail on the rack in an embedded mode through a dovetail groove.
The movable sliding table and the connecting plate are connected together through threads and can move freely on the frame together.
The length between the two sides of the frame is the sum of the length of the single shape memory piece in the contraction state, the length of the single shape memory piece in the extension state and the length of the movable sliding table.
Two, a reciprocating motion control method combining the characteristics of shape memory polymer
1) Under the initial condition, the first shape memory polymer and the second shape memory polymer are respectively in the initial extension shape at normal temperature;
2) the method comprises the following steps of heating a first shape memory polymer to a first temperature, keeping a second shape memory polymer constant at the normal temperature, applying an external force to the first shape memory polymer for compression, then loading the first shape memory polymer and the second shape memory polymer into a rack together and connecting the first shape memory polymer and the second shape memory polymer to the rack and a movable sliding table, wherein after loading, the first shape memory polymer is not heated and naturally descends along with the normal temperature, and the shape of the first shape memory polymer is kept in a compressed state;
3) firstly, heating the second shape memory polymer to a second temperature and keeping the second shape memory polymer, then heating the first shape memory polymer to a first temperature and keeping the first shape memory polymer, wherein the rigidity and the restoring force of the first shape memory polymer are both larger than those of the second shape memory polymer, the sliding platform moves towards the direction close to the second shape memory polymer under the pushing of the first shape memory polymer, and the first shape memory polymer 1 and the second shape memory polymer do not heat and naturally descend along with the normal temperature after the sliding platform moves stably;
4) firstly, heating the first shape memory polymer to a second temperature and keeping the first shape memory polymer, then heating the second shape memory polymer to the first temperature and keeping the first shape memory polymer, wherein the rigidity and the restoring force of the second shape memory polymer are both larger than those of the first shape memory polymer, the sliding platform moves towards the direction close to the first shape memory polymer, and the first shape memory polymer and the second shape memory polymer do not heat any more and naturally descend along with the normal temperature after the sliding platform moves stably;
5) and (4) repeating the steps 3) and 4) continuously to and fro to realize the recovery and extension of the polymer shape and realize the reciprocating motion of the sliding platform.
The second temperature is higher than the first temperature.
The heating module is a silver resistance wire, and mainly provides heat for a first shape memory polymer and a second shape memory polymer to increase the temperature of the polymers; the first shape memory polymer and the second shape memory polymer mainly utilize the shape memory characteristic to realize the stretching and the contraction, thereby driving the reciprocating motion of the moving sliding table.
In the invention, the slider can move mainly because the rigidity of the shape memory polymer is reduced along with the rise of the temperature, the temperature is controlled by the size of the current electrified by the resistance silver wire, and the shape memory polymer is stretched and contracted by utilizing the temperature change, thereby realizing the reciprocating movement of the sliding table.
The device of the invention fully utilizes the characteristic that the shape memory polymer is flexible when being heated, and realizes the space change with large stroke in a smaller space. Meanwhile, the overall occupied space of the mechanism is small, and the space range is effectively saved.
The invention has the beneficial effects that:
the invention can solve the problems of more control components and complex control components of the traditional reciprocating mechanism in the motion process by utilizing the 4D printing technology, and can realize the driving effect by utilizing the deformation of the material by utilizing the characteristics of the material. On the other hand, the device of the invention can better utilize the space, save the resources and reduce the cost.
The device can realize the reciprocating movement of the mechanism by utilizing the dynamic cyclic reciprocating change of the shape memory polymer without a complex control assembly. The device can overcome the defects that the traditional reciprocating mechanism is difficult to control, more control components and the like.
The invention adopts a double-symmetrical structure to carry out deformation reciprocating motion, has a simpler control mode of the reciprocating motion, can reduce the impact of the reciprocating motion, and has gentle motion and impact resistance.
Drawings
FIG. 1 is a schematic structural diagram of a 4D printing characteristic cyclic reciprocating mechanism of the present invention;
fig. 2 is a schematic diagram of the working principle of the device of the invention.
In the figure, 1 platform frame, 2 second shape memory polymer, 3 first shape memory polymer, 4 heating module, 5 guide rail, 6 sliding platform, 7 connecting plate.
Detailed Description
The invention is further described with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, the mechanism comprises a frame 1, a movable sliding table 6, a shape memory part, a guide rail 5 and a connecting plate 7; a guide rail 5 is arranged in the frame 1, a movable sliding table 6 is slidably mounted on the guide rail 5, a connecting plate 7 is fixedly mounted on the movable sliding table 6, and two sides of the connecting plate 7 are respectively connected with two sides of the inside of the frame 1 through a shape memory part; each shape memory part mainly comprises a shape memory polymer 2/3 and a heating module 4, the shape memory polymer 2/3 is arranged in an S shape, namely a wave shape, the heating module 4 is arranged inside the S-shaped bend inflection point of the semi-circular arc of the shape memory polymer 2/3, the heating module 4 is in a semi-circular arc shape, the heating module 4 is used for heating and controlling the shape of the shape memory polymer 2/3, and two ends of the shape memory polymer 2/3 are respectively connected to the side part of the connecting plate 7 and the inner side part of the frame 1; the shape memory polymer 2/3 is arranged in an S-shape between the side of the web 7 and the side of the frame 1.
In specific implementation, the heating module 4 is made of a resistance silver wire, and the resistance silver wire is embedded in or arranged inside the shape memory polymer. The silver resistance wire which can be stretched and deformed is embedded in the polymer and is used as a heat source. The heating module 4 can realize the simultaneous bending and deformation of the shape memory polymer when the shape memory polymer is heated to shrink and stretch.
The movable sliding table 6 is installed on the rack 1 by being embedded and matched with the guide rail 6 on the rack 1 through a dovetail groove. The movable sliding table 6 and the connecting plate 7 are connected together through threads and can freely move on the machine frame 1 together.
The length between the two sides of the frame 1 is the sum of the length of the single shape memory element in the contracted state, the length in the extended state and the length of the moving slide 6.
The left end and the right end of the connecting plate 7 are respectively connected with the first shape memory polymer 3 and the second shape memory polymer 2, and the other ends of the first shape memory polymer 3 and the second shape memory polymer 2 are connected with the frame 1. Wherein the shape memory polymer is connected with the movable sliding table 6 and the frame 1 through a threaded connection to fix the shape memory polymer on the frame 1 and the connecting plate 7.
The S-shaped wavy striations on the upper surface and the lower surface of the first shape memory polymer 3 and the second shape memory polymer 2 can effectively relieve the bending fatigue damage and stress damage generated when the shape memory polymers are expanded and contracted due to heating, and the integrity and the restorability of the shape memory polymers are ensured to the maximum extent.
The first shape memory polymer 3 and the second shape memory polymer 2 are controlled by the heating module 4 to be heated to change shapes, and the stretching and the contraction of the shapes are realized.
Wherein the main component of the first shape memory polymer and the second shape memory polymer used in the present invention is polylactic acid; the main body part of the frame is made of aluminum alloy; the movable sliding table and the guide rail are made of high-quality carbon steel; the heating module is made of manganese alloy, and the inside of the heating module is made of metal silver wires.
The device of the invention fully utilizes the characteristic that the shape memory polymer is flexible when being heated, and realizes the space change with large stroke in a smaller space. Meanwhile, the overall occupied space of the mechanism is small, and the space range is effectively saved.
As shown in fig. 2, the working process and working principle of the present invention are divided into the following steps:
under the initial condition, the first shape memory polymer 1 and the second shape memory polymer 2 are respectively in the initial extension shape at normal temperature;
firstly heating the first shape memory polymer 1, wherein the heating temperature is 60 ℃, the second shape memory polymer 2 is kept unchanged at normal temperature, external force is applied to the first shape memory polymer 1 for compression, then the first shape memory polymer 1 and the second shape memory polymer 2 are jointly installed in the rack 1 and connected to the rack 1 and the movable sliding table 6, after installation, the first shape memory polymer 1 is not heated any more and naturally descends along with the normal temperature, and the rigidity of the second shape memory polymer 2 is greater than that of the first shape memory polymer 1, so that the shape of the first shape memory polymer 1 is kept in a compressed state;
thirdly, heating the second shape memory polymer 2 to 90 ℃ and keeping the temperature, then heating the first shape memory polymer 1 to 60 ℃ and keeping the temperature, wherein the rigidity and the restoring force of the first shape memory polymer 1 are both larger than those of the second shape memory polymer 2, the sliding platform 6 moves towards the direction close to the second shape memory polymer 2 under the pushing of the first shape memory polymer 1, and the first shape memory polymer 1 and the second shape memory polymer 2 are not heated any more and naturally descend along with the normal temperature after the movement is stable;
firstly heating the first shape memory polymer 1 to 90 ℃ and keeping the first shape memory polymer, then heating the second shape memory polymer 2 to 60 ℃ and keeping the second shape memory polymer, wherein the rigidity and the restoring force of the second shape memory polymer 2 are both larger than those of the first shape memory polymer 1, the sliding platform 6 moves towards the direction close to the first shape memory polymer 1, and the first shape memory polymer 1 and the second shape memory polymer 2 are not heated any more after moving stably and naturally descend along with the normal temperature;
fifthly, repeating the steps of the third step and the fourth step repeatedly to realize the recovery and the extension of the shape of the polymer and realize the reciprocating motion of the sliding platform 6.
The schematic diagram of the movement principle process of the device is shown in figure 2.
Claims (5)
1. A reciprocating mechanism incorporating the properties of a shape memory polymer, characterized by: comprises a frame (1), a movable sliding table (6), a shape memory piece, a guide rail (5) and a connecting plate (7); a guide rail (5) is arranged in the rack (1), a movable sliding table (6) is slidably mounted on the guide rail (5), a connecting plate (7) is fixedly mounted on the movable sliding table (6), and two sides of the connecting plate (7) are respectively connected with two sides of the interior of the rack (1) through a shape memory part; each shape memory piece mainly comprises a shape memory polymer (2/3) and a heating module (4), the shape memory polymer (2/3) is arranged in an S shape, the heating module (4) is arranged inside the S-shaped semicircular arc bending inflection point of the shape memory polymer (2/3), and two ends of the shape memory polymer (2/3) are connected to the side portion of the connecting plate (7) and the inner side portion of the frame (1) respectively.
2. A reciprocating mechanism incorporating the properties of a shape memory polymer as claimed in claim 1 wherein: the heating module (4) adopts a resistance silver wire, and the resistance silver wire is arranged inside or on the inner side of the shape memory polymer in an embedding mode.
3. A reciprocating mechanism incorporating the properties of a shape memory polymer as claimed in claim 1 wherein: the movable sliding table (6) is matched with the guide rail (6) on the rack (1) in an embedded mode through a dovetail groove.
4. A reciprocating mechanism incorporating the properties of a shape memory polymer as claimed in claim 1 wherein: the movable sliding table (6) is connected with the connecting plate (7) through threads and can move freely on the rack (1).
5. A reciprocating mechanism incorporating the properties of a shape memory polymer as claimed in claim 1 wherein: the length between the two sides of the frame (1) is the sum of the length of a single shape memory piece in a contraction state, the length of the single shape memory piece in an extension state and the length of the movable sliding table (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111068800.3A CN113798158A (en) | 2021-09-13 | 2021-09-13 | Reciprocating mechanism combining characteristics of shape memory polymer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111068800.3A CN113798158A (en) | 2021-09-13 | 2021-09-13 | Reciprocating mechanism combining characteristics of shape memory polymer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113798158A true CN113798158A (en) | 2021-12-17 |
Family
ID=78940980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111068800.3A Pending CN113798158A (en) | 2021-09-13 | 2021-09-13 | Reciprocating mechanism combining characteristics of shape memory polymer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113798158A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7188473B1 (en) * | 2004-04-26 | 2007-03-13 | Harry HaruRiko Asada | Shape memory alloy actuator system using segmented binary control |
| US20110173970A1 (en) * | 2009-10-05 | 2011-07-21 | Massachusetts Institute Of Technology | Flexible actuator based on shape memory alloy sheet |
| CN102889188A (en) * | 2012-09-29 | 2013-01-23 | 黑龙江科技学院 | Two-way linear driver based on shape memory material actuator |
| CN109483869A (en) * | 2018-12-12 | 2019-03-19 | 哈尔滨工业大学 | A kind of device for the in-orbit 4D printing of thermoset shape memory polymer |
| CN211265352U (en) * | 2019-11-13 | 2020-08-14 | 天津大学 | Mechanical logic control bidirectional actuating mechanism based on shape memory alloy |
-
2021
- 2021-09-13 CN CN202111068800.3A patent/CN113798158A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7188473B1 (en) * | 2004-04-26 | 2007-03-13 | Harry HaruRiko Asada | Shape memory alloy actuator system using segmented binary control |
| US20110173970A1 (en) * | 2009-10-05 | 2011-07-21 | Massachusetts Institute Of Technology | Flexible actuator based on shape memory alloy sheet |
| CN102889188A (en) * | 2012-09-29 | 2013-01-23 | 黑龙江科技学院 | Two-way linear driver based on shape memory material actuator |
| CN109483869A (en) * | 2018-12-12 | 2019-03-19 | 哈尔滨工业大学 | A kind of device for the in-orbit 4D printing of thermoset shape memory polymer |
| CN211265352U (en) * | 2019-11-13 | 2020-08-14 | 天津大学 | Mechanical logic control bidirectional actuating mechanism based on shape memory alloy |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108839051B (en) | Miniature flexible clamp based on shape memory alloy drive | |
| CN102319785B (en) | Single-action type variable length connecting rod and crank-connecting rod transmission mechanism | |
| CN104874664A (en) | Alloy pipe fitting electromagnetic bulging and flanging synchronous forming device and method | |
| CN104607517A (en) | Flexible complex curved-plate machining equipment | |
| CN113798158A (en) | Reciprocating mechanism combining characteristics of shape memory polymer | |
| HK1115226A1 (en) | Energy accumulator | |
| CN105033005B (en) | A kind of wavy metal paillon foil impact forming method and its punch-forming mold | |
| CN209753756U (en) | Variable curve type efficient stretching punch press | |
| CN114261123A (en) | Press for Roman chair forming die | |
| CN113333544A (en) | Electric-assisted variable-section roll forming device and method | |
| CN215391695U (en) | Iron shell shaping and forming mechanism | |
| CN106513486B (en) | A kind of plate liquid filling deep-drawing forming method based on parallel institution | |
| CN103480766B (en) | One-side cantilever linear motor direct-driven feeding device for cover stamping line | |
| CN209943226U (en) | Hydraulic horizontal forging machine | |
| CN108273902B (en) | Metal blank local feature manufacturing process and device | |
| CN101758119B (en) | Multi-cylinder built-up section cold-bending automatic molding equipment and processing method thereof | |
| WO2016022088A1 (en) | Bending press having a drive system with torque motor | |
| CN103632996B (en) | Press fit device and bonder | |
| CN106167175A (en) | Material pusher | |
| CN102689449B (en) | Gas-liquid boosting pressure machine | |
| CN214888054U (en) | Stroke-adjustable power cylinder | |
| CN104057466B (en) | A kind of Special manipulator for injection molding machine telescoping mechanism | |
| CN215847746U (en) | Flexible clamping device suitable for various special-shaped curved surface products | |
| US20230309408A1 (en) | An actuator mechanism | |
| CN215314981U (en) | Electric auxiliary variable cross-section rolling forming device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211217 |
|
| RJ01 | Rejection of invention patent application after publication |