CN1233509C - Miniature creeping vehicle based on shape memory alloy driving - Google Patents

Miniature creeping vehicle based on shape memory alloy driving Download PDF

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Publication number
CN1233509C
CN1233509C CN 02160687 CN02160687A CN1233509C CN 1233509 C CN1233509 C CN 1233509C CN 02160687 CN02160687 CN 02160687 CN 02160687 A CN02160687 A CN 02160687A CN 1233509 C CN1233509 C CN 1233509C
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China
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vehicle body
shape memory
memory alloy
alloy spring
aftercarriage
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CN 02160687
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CN1421302A (en
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姚沁
金晟
孙志强
马培荪
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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Abstract

The present invention relates to a minisize creeping vehicle based on shape memory alloy drive, which belongs to the technical field of a robot. The present invention mainly comprises a mechanism main body, a control system and an electricity supplying device, wherein the mechanism main body mainly comprises a front vehicle body, a shape memory alloy driving device, an elastic rod, a rear vehicle body, a front wheel self-locking mechanism, a rear wheel self-locking mechanism, a front wheel and a rear wheel, the elastic rod is hinged with the front vehicle body and the rear vehicle body, the front vehicle body is connected with the front wheel through a wheel shaft, the front vehicle body is connected with the front wheel self-locking mechanism through the wheel shaft, the rear vehicle body is connected with the rear wheel through the wheel shaft, and the rear vehicle body is connected with the rear wheel self-locking mechanism through the wheel shaft. Furthermore, the shape memory alloy driving device is connected with the front vehicle body and the rear vehicle body into integration through a guide barrel, a parallel mechanism is formed by the shape memory alloy driving device and the elastic rod, and a connection position of the elastic rod on the front vehicle body and the rear vehicle body is above a connection position of the shape memory alloy driving device, the front vehicle body and the rear vehicle body. Walking pace distances of the minisize vehicle are obviously enlarged by the present invention, the minisize vehicle can move in an irregular and bent type pipeline, and the present invention provides a cheap and convenient solution for the detection and the maintenance of minisize pipelines in fields such as a nuclear power station, an aerospaceplane, etc.

Description

Wriggling minicar based on the marmem driving
Technical field
What the present invention relates to is the wriggling minicar of a kind of pipe detection and maintenance, and particularly a kind of wriggling minicar that drives based on marmem belongs to the Robotics field.
Background technique
It is 1 inch, 2 inches microminiature pipe that there are a large amount of internal diameters in complex system such as nuclear power station and space shuttle, for these pipelines effectively being detected and safeguarding, presses for the micro robot that development is applicable to the micro type pipeline.
According to retrieval to prior art, find: the patent of Shanghai Communications University's application, name is called: Cubical creeping and walking mechanism of intertube robot, application (patent) numbers 99113962.3, this patent disclosure comprehensive creepage robot traveller in a kind of square bodily form pipe.This traveller outward appearance is the square bodily form, is connected with 8 measure-alike supporting foots that are positioned at place, square body summit by 12 that are positioned at square body seamed edge place measure-alike marmem linear actuators to form.The feature of marmem linear actuator is: be assembled by a common helical spring, a Coil Spring of Shape Memory Alloys, two cylindrical sleeves and two metal clips, common helical spring is enclosed within the sleeve outside, two ends withstand on the step place of sleeve, and common helical spring diastole provides diastole power for driver.Coil Spring of Shape Memory Alloys is after sleeve inner is passed, and two ends are clamped by two metal clips, and the metal clip retaining is in the outside, sleeve two ends, and Coil Spring of Shape Memory Alloys is punctured into driver contractile force is provided.Two metal clips link to each other with the both positive and negative polarity of power supply by lead respectively during work.When robot moves in managing, by the sequential of control flows electric current of marmem in each set drive, control linear actuator and alternately shrink and diastole, the realization robot wriggles the front and back in straight tube and walks.This patent adopts 12 groups of shape memory alloy spring linear actuators to constitute square body structure, causes the control complex time, and the motion of each set drive interferes with each other, and power consumption is big, and the walking top speed only can reach 10 mm/min.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of wriggling minicar that drives based on marmem is provided, make its cost low, power consumption is little, and the step square obviously increases, owing to adopt the novel intelligent driver, noise free, pollution-free especially is fit to strict pipe detection.The present invention is achieved by the following technical solutions, the present invention mainly comprises: mechanism body, control system and power supply unit, four input leads of control system are connected with power supply unit, two output pins are connected with mechanism body, mechanism body mainly comprises: front vehicle body, marmen, elastic rod, aftercarriage, the front wheel self-locking mechanism, the rear wheel self-locking mechanism, front wheel and rear wheel, its Placement is: elastic rod and front vehicle body, aftercarriage is hinged, front vehicle body and front wheel, front vehicle body and front wheel self-locking mechanism, aftercarriage and rear wheel, aftercarriage is connected by wheel shaft respectively with the rear wheel self-locking mechanism, guide and the front vehicle body of marmen by setting within it, aftercarriage fuses, marmen and elastic rod constitute parallel mechanism structure, and elastic rod is preceding, coupled position on the aftercarriage is in marmen and front vehicle body, the top of aftercarriage coupled position.
Marmen is made of a common bias spring, shape memory alloy spring, guide and a screw, shape memory alloy spring passes the guide internal diameter, constitute parallel compliant mechanism with the common bias spring that is enclosed within on the guide external diameter, the shape memory alloy spring two ends are fixed by screw and guide respectively, common bias spring provides restoring force to shape memory alloy spring, the restriction of car body before and after common bias spring vertically is subjected to, guide play the guiding role.
Shape memory alloy spring is connected with control system by lead, the phase transformation state of control system control shape memory alloy spring.When control system made shape memory alloy spring be in heated condition, shape memory alloy spring produced powerful contractile force, and front vehicle body, aftercarriage and then shrink; When control system made shape memory alloy spring be in the state of cooling, the shape memory alloy spring contractile force disappeared, and under the acting in conjunction of common bias spring and elastic rod, forward and backward car body elongation also bends.
The initial configuration of forward and backward car body must meet the following conditions: the original length of marmen is longer than elastic rod; Make forward and backward car body (under no electric circuit state) under nature, elastic rod is tightened, and marmen forward, aftercarriage below is crooked; Under the "on" position, marmen vertically shortens, and elastic rod is relaxed state.
The motion mode of simulating nature circle worm of the present invention, front and back wheel plays retainer, keeps relative rolling or static in different phase with ground; Marmen and elastic rod constitute parallel compliant mechanism, and the speed of travel can reach 50 mm/min.
Forward and backward wheel self-locking mechanism is a kind of eccentric wheel braking device, and forward and backward wheel and forward and backward wheel self-locking mechanism are coarse elastomer, and self-locking mechanism is an eccentric wheel structure, utilizes the friction circle principle to realize self-locking.Front and back wheel is rotated to the car body direction of advance and is driven forward and backward wheel self-locking mechanism counter-rotation; Both compress mutually, and the suffered driving force of forward and backward wheel self-locking mechanism can fall in the friction circle with joint efforts gradually, thereby realize self-locking.Equally, forward and backward wheel rotates towards the car body direction of retreat will drive forward and backward wheel self-locking mechanism and the equidirectional rotation of car body direction of advance, the suffered driving force of forward and backward wheel self-locking mechanism can drop on outside the friction circle with joint efforts gradually, at this moment the not self-locking of forward and backward wheel self-locking mechanism, forward and backward wheel can roll forward in the clear.The eccentric wheel self-locking mechanism rolls forward and backward wheel only forward, can not reverse backward, thus the moving direction of control car body.
Elastic rod and marmen constitute parallel compliant mechanism, and marmen foreshortens to a certain degree, and elastic rod is relaxed state, can ignore to the effect of system; When marmen is stretched to a certain degree, elastic rod is elongated gradually to be tightened, both form mutual constraint, the net shape memory alloy actuator vertically is subjected to the length restriction of elastic rod and is bent downwardly, this compliant mechanism occurs bending and deformation, make car body also bend, parallel compliant mechanism has two states in a cycle of motion: contracted state and diastole attitude.
Control system is integrated control chip, drive the diverter in amplification circuit and the executive circuit, the output port of control chip connects the input end that drives amplification circuit, drives the diverter of the output termination executive circuit of amplification circuit.
Drive amplification circuit and constitute by triode, base resistance, the output port of base resistance one termination control chip, the other end links to each other with the base stage of triode.
Executive circuit is made of shape memory alloy spring in the mechanism body and diverter, and shape memory alloy spring one end connects another root output pin of the other end connected control system by the output pin and the diverter polyphone of control system; Another termination of diverter drives the output terminal of amplification circuit, promptly connects the collector electrode of triode.
Triode plays on-off action, the input of its base stage be PWM (pulsewidth modulation) signal of control chip output, PWM (pulsewidth modulation) is when signal is in high level, triode conducting, executive circuit conducting, shape memory alloy spring energising heating; PWM (pulsewidth modulation) is when signal is in low level, triode by, executive circuit disconnects, shape memory alloy spring outage cooling, PWM (pulsewidth modulation) signal of control chip output connects the driving amplification circuit, and can be by changing the heating and the cool time of the program adjusting shape memory alloy spring in the chip.PWM (pulsewidth modulation) signal adopts three kinds of dutycycles, realizes the shape memory alloy spring heat shrink, is incubated and keeps, cool off three kinds of states of diastole, and its advantage is: prevent that shape memory alloy spring is overheated; Keeping warm mode adopts weak current, reduces energy consumption; Must temperature or the resistance feedback, simplify circuit.
Apparatus of the present invention are totally assembled, the service line at shape memory alloy spring two ends is connected with the output line of control system respectively, control system is when assembling, adjust power supply unit earlier, make its two output voltage be 5V, with mechanism body and control system, control system is connected by lead-in wire respectively with power supply unit again.After mechanism body and control system are all adjusted, open power supply unit main switch, system can normally move.The vermicular movement of a complete cycle of the present invention can be decomposed into contraction process and two processes of diastole process:
Contraction process: the heating of (1) shape memory alloy spring, rear wheel moves forward distance, and the front wheel self-locking mechanism compresses front wheel, and elastic rod recovers former length, and front vehicle body and aftercarriage turn to the vertical position around wheel shaft respectively; The car body profile by the diastole attitude gradually to the contracted state transition; (2) shape memory alloy spring insulation, forward and backward wheel keeps the state identical with (1), and elastic rod is lax, the bias spring lateral bending, car body continues to shrink, and profile becomes contracted state gradually.
The diastole process: the cooling of (3) shape memory alloy spring, the rear wheel self-locking mechanism compresses rear wheel, and front wheel is displacement distance forward, and elastic rod is tightened gradually; Forward and backward car body by contracted state to the transition of diastole attitude.(4) shape memory alloy spring continues cooling, and front wheel, rear wheel keep the state identical with (3), and elastic rod is tightened, front vehicle body and aftercarriage rotate around wheel shaft respectively, tilted gradually by initial vertical position, car body continues diastole, and profile becomes the diastole attitude gradually.So far, minicar has been finished the vermicular movement forward of one-period.
Repeat above step, minicar can be wriggled forward continuously.
The present invention has substantive distinguishing features and remarkable progress, the biological already present structure of most natural imitation circle of Kai Fa micro robot in the past, as adopt leg foot or geometrical construction etc., the present invention broke the tradition that domestic and international in recent years micro robot adopts leg formula structure mostly, it is the brand-new trial of the wheeled micro robot of exploitation, the warm bionics principle of the present invention, absorb the advantage of wheeled mechanism, and overcome some defectives of wheeled construction inherence, broken the circumscribed viewpoint of wheeled mechanism of propositions such as Teshigahara, utilize the contraction and the diastole campaign of shape memory alloy spring simulation worm muscle, elastic rod in the hard and soft hybrid component and flexible joint, obviously increased the forward step square of minicar, can in irregular flexure type pipeline, move, the wheel self-locking mechanism has successfully been eliminated the wheel setback, and control wheel movement direction is for the inspection and the maintenance of other special dimension microminiature pipelines such as nuclear power station space shuttle provides cheapness solution easily.
Description of drawings
Fig. 1 general structure schematic representation of the present invention
Fig. 2 mechanism body structural representation of the present invention
Fig. 3 marmen structural representation of the present invention
Fig. 4 control system block diagram of the present invention
Embodiment
As Fig. 1, Fig. 2, Fig. 3 and shown in Figure 4, the present invention mainly comprises: mechanism body 1, control system 2 and power supply unit 3, two output pins 4 of control system 2 are connected with mechanism body 1, four input leads 23 are connected with power supply unit 3, mechanism body 1 mainly comprises: front vehicle body 5, marmen 6, elastic rod 7, aftercarriage 8, front wheel self-locking mechanism 9, rear wheel self-locking mechanism 10, front wheel 11 and rear wheel 12, its Placement is: elastic rod 7 and front vehicle body 5, aftercarriage 8 is hinged, front vehicle body 5 and front wheel 11, front vehicle body 5 and front wheel self-locking mechanism 9, aftercarriage 8 and rear wheel 12, aftercarriage 8 is connected by wheel shaft respectively with rear wheel self-locking mechanism 10, the guide 15 and front vehicle body 5 of marmen 6 by setting within it, aftercarriage 8 fuses, marmen 6 constitutes parallel mechanism structure with elastic rod 7, and elastic rod 7 is in front vehicle body 5, coupled position on the aftercarriage 8 is in marmen 6 and front vehicle body 5, the top of aftercarriage 8 coupled position.
Marmen 6 is made of a common bias spring 13, shape memory alloy spring 14, guide 15 and a screw 16, shape memory alloy spring 14 passes guide 15 internal diameters, constitute parallel compliant mechanism with the common bias spring 13 that is enclosed within on guide 15 external diameters, shape memory alloy spring 14 two ends are fixing with guide 15 by screw 16 respectively, common bias spring 13 provides restoring force to shape memory alloy spring 14, common bias spring 13 vertically is subjected to the restriction of front vehicle body 5, aftercarriage 8, and guide 15 play the guiding role.
Shape memory alloy spring 14 is connected with control system 2 by lead 4, the phase transformation state of control system 2 control shape memory alloy springs 14, when control system 2 makes shape memory alloy spring 14 be in heated condition, shape memory alloy spring 14 produces powerful contractile force, and front vehicle body 5, aftercarriage 8 and then shrink; When control system 2 made shape memory alloy spring 14 be in the state of cooling, shape memory alloy spring 14 contractile forces disappeared, and under the acting in conjunction of common bias spring 13 and elastic rod 7, front vehicle body 5, aftercarriage 8 elongations also bend.
The initial configuration of front vehicle body 5, aftercarriage 8 must meet the following conditions: the original length of marmen 6 is longer than elastic rod 7; Make front vehicle body 5, aftercarriage 8 under nature, elastic rod 7 is tightened, and marmen 6 is to front vehicle body 5, aftercarriage 8 below bendings; Under the "on" position, marmen 6 vertically shortens, and elastic rod 7 is relaxed state.
Front wheel self-locking mechanism 9, rear wheel self-locking mechanism 10 are a kind of eccentric wheel braking devices, front wheel 11, rear wheel 12 are coarse elastomer with front wheel self-locking mechanism 9, rear wheel self-locking mechanism 10, and front wheel self-locking mechanism 9, rear wheel self-locking mechanism 10 are eccentric wheel structure.
Control system 2 is integrated control chip 17, drive the diverter 20 in amplification circuit 18 and the executive circuit 19, the output port of control chip 17 connects the input end that drives amplification circuit 18; Drive the diverter 20 of the output termination executive circuit 19 of amplification circuit 18.
Drive amplification circuit 18 and constitute by triode 21, base resistance 22, the output port of base resistance 22 1 termination control chips 17, the other end links to each other with the base stage of triode 21.
Executive circuit 19 is made of shape memory alloy spring in the mechanism body 1 14 and diverter 20, shape memory alloy spring 14 1 ends connect another root output pin of the other end connected control system 2 by the output pin and diverter 20 polyphones of control system 2; The other end of diverter 20 then connects the output terminal that drives amplification circuit, the i.e. collector electrode of triode 21.
What the base stage of triode 21 was imported is the pulse-width signal of control chip 17 outputs, when pulse-width signal is in high level, and triode 21 conductings, executive circuit conducting, shape memory alloy spring 14 energising heating; When pulse-width signal is in low level, triode 21 by, executive circuit disconnects, shape memory alloy spring 14 outage coolings, the pulse-width signal of control chip 17 outputs connects and drives amplification circuit 18, and can be by changing the heating and the cool time of the program adjusting shape memory alloy spring 14 in the control chip 17.
Pulse-width signal adopts three kinds of dutycycles, realizes shape memory alloy spring 14 heat shrink, is incubated and keeps, cool off three kinds of states of diastole.

Claims (10)

1, a kind of wriggling minicar that drives based on marmem, mainly comprise: mechanism body (1), control system (2) and power supply unit (3), two output pins (4) of control system (2) are connected with mechanism body (1), four input leads (23) are connected with power supply unit (3), it is characterized in that: described mechanism body (1) mainly comprises: front vehicle body (5), marmen (6), elastic rod (7), aftercarriage (8), front wheel self-locking mechanism (9), rear wheel self-locking mechanism (10), front wheel (11) and rear wheel (12), its Placement is: elastic rod (7) and front vehicle body (5), aftercarriage (8) is hinged, front vehicle body (5) and front wheel (11), front vehicle body (5) and front wheel self-locking mechanism (9), aftercarriage (8) and rear wheel (12), aftercarriage (8) is connected by wheel shaft respectively with rear wheel self-locking mechanism (10), the guide (15) and front vehicle body (11) of marmen (6) by setting within it, aftercarriage (12) fuses, marmen (6) constitutes parallel mechanism structure with elastic rod (7), and elastic rod (7) is in front vehicle body (5), coupled position on the aftercarriage (8) is in marmen (6) and front vehicle body (5), the top of aftercarriage (8) coupled position.
2, this wriggling minicar that drives based on marmem according to claim 1, it is characterized in that marmen (6) is by common bias spring (13), shape memory alloy spring (14), guide (15) and screw (16) constitute, shape memory alloy spring (14) passes guide (15) internal diameter, constitute parallel compliant mechanism with the common bias spring (13) that is enclosed within on guide (15) external diameter, shape memory alloy spring (14) two ends are fixing by screw (16) and guide (15) respectively, common bias spring (13) provides restoring force to shape memory alloy spring (14), common bias spring (13) vertically is subjected to front vehicle body (5), the restriction of aftercarriage (8), guide (15) play the guiding role.
3, this wriggling minicar that drives based on marmem according to claim 1 and 2, it is characterized in that shape memory alloy spring (14) is connected with control system (2) by lead (4), the phase transformation state of control system (2) control shape memory alloy spring (14), when control system (2) makes shape memory alloy spring (14) when being in heated condition, shape memory alloy spring (14) produces powerful contractile force, and front vehicle body (5), aftercarriage (8) are along with contraction; When control system (2) makes shape memory alloy spring (14) when being in the state of cooling, shape memory alloy spring (14) contractile force disappears, under the acting in conjunction of common bias spring (13) and elastic rod (7), front vehicle body (5), aftercarriage (8) elongation and crooked.
4, this wriggling minicar that drives based on marmem according to claim 1, it is characterized in that the initial configuration of front vehicle body (5), aftercarriage (8) must meet the following conditions: the original length of marmen (6) is longer than elastic rod (7); Make front vehicle body (5), aftercarriage (8) under nature, elastic rod (7) is tightened, and marmen (6) is crooked to front vehicle body (5), aftercarriage (8) below; Under the "on" position, marmen (6) vertically shortens, and elastic rod (7) is relaxed state.
5, this wriggling minicar that drives based on marmem according to claim 1, it is characterized in that front wheel self-locking mechanism (9), rear wheel self-locking mechanism (10) are a kind of eccentric wheel braking devices, front wheel (11), rear wheel (12) are coarse elastomer with front wheel self-locking mechanism (9), rear wheel self-locking mechanism (10), and front wheel self-locking mechanism (9), rear wheel self-locking mechanism (10) are eccentric wheel structure.
6, this wriggling minicar that drives based on marmem according to claim 1, it is characterized in that control system (2) integrated control chip (17), drive the diverter (20) in amplification circuit (18) and the executive circuit (19), the output port of control chip (17) connects the input end that drives amplification circuit (18), drives the diverter (20) of the output termination executive circuit (19) of amplification circuit (18).
The 7 this wriggling minicars that drive based on marmem according to claim 6, it is characterized in that driving amplification circuit (18) is made of triode (21), base resistance (22), the output port of base resistance (22) one termination control chips (17), the other end links to each other with the base stage of triode (21).
The 8 this wriggling minicars that drive based on marmem according to claim 6, it is characterized in that executive circuit (19) is made of shape memory alloy spring (14) in the mechanism body (1) and diverter (20), shape memory alloy spring (14) one ends connect another root output pin of the other end connected control system (2) by the output pin and diverter (20) polyphone of control system (2); The other end of diverter (20) then connects the output terminal that drives amplification circuit, the i.e. collector electrode of triode (21).
9, this wriggling minicar that drives based on marmem according to claim 7, it is characterized in that triode (21) base stage input be the pulse-width signal of control chip (17) output, when pulse-width signal is in high level, triode (21) conducting, the executive circuit conducting, shape memory alloy spring (14) energising heating; When pulse-width signal is in low level, triode (21) by, executive circuit disconnects, shape memory alloy spring (14) outage cooling, the pulse-width signal of control chip (17) output connects and drives amplification circuit (18), and by changing the heating and the cool time of the program adjusting shape memory alloy spring (14) in the control chip (17).
10, this wriggling minicar that drives based on marmem according to claim 9 is characterized in that pulse-width signal adopts three kinds of dutycycles, realizes shape memory alloy spring (14) heat shrink, is incubated and keeps, cool off three kinds of states of diastole.
CN 02160687 2002-12-30 2002-12-30 Miniature creeping vehicle based on shape memory alloy driving Expired - Fee Related CN1233509C (en)

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