CN202158926U

CN202158926U - Differential type horizontal micro force loading device

Info

Publication number: CN202158926U
Application number: CN2011202693707U
Authority: CN
Inventors: 王勇; 何鲲; 孙敬慧; 刘正士; 刘焕进
Original assignee: Hefei University of Technology
Current assignee: Hefei University of Technology
Priority date: 2011-07-27
Filing date: 2011-07-27
Publication date: 2012-03-07
Anticipated expiration: 2021-07-27

Abstract

The utility model discloses a differential type horizontal micro force loading device and method. The differential type horizontal micro force loading device is characterized in that a vertically arranged secondary lever is taken as a center rod; and in the same vertical plane, a pair of primary levers are symmetrically arranged at two sides of the secondary lever and is connected with the secondary lever through a transition rods at one side of each of the primary levers. In the differential type horizontal micro force loading device, a secondary lever force decrease mechanism is established based on a flexible hinge and lever principle and is used for generating micro acting force; and by means of the flexible hinge, the friction link in a calibration system is decreased, and the calibration precision is enhanced.

Description

The horizontal micro-force loading device of differential type

Technical field

The utility model relates to the micro-force loading device that is applied in the field of measuring technique.

Background technology

Flourish along with modern science and technology; Need the occasion of little small value force more and more; For example the Research on Mechanical Properties of microscale lower member in the MEMS, Micro Lub phenomenon are measured, little power detection etc. in the assembling of micro sensing Micro-Robot; Therefore, the research of Micro-force sensor, making, production are also with regard to thereupon carrying out.But its research is made relatively, and the performance measurement development of Micro-force sensor itself seems and relatively lags behind.The conventional at present pulley counterweight method of using can't be carried out little power loading force; Existing Lorentz force and electrostatic force scaling method are because of the more instability of bringing of affected factor; Utilize piezoelectric element to produce the applied more and more of little power in recent years, but this method cost is high, complicated operation, and the power scope that produces is less.

Flexure hinge mechanism has obtained widespread use in fields such as precision measurement, demarcation at present; But about flexible hinge distortion, lever centre of gravity place and variation of temperature to measuring and the influence of stated accuracy still lacks comprehensive consideration and research; Do not see structural design so far for elimination gravity and temperature two aspect factor affecting, and when little power is demarcated or measured, in order to obtain higher precision; Must solve of the influence that demarcation or measurement caused of above several respects to little power; Because the influence that gravity and temperature produce possibly be far longer than the maximum range that little power loads, little power is loaded the fatal influence of generation.

The utility model content

The utility model is for avoiding the existing weak point of above-mentioned prior art; A kind of requirement and horizontal cheaply micro-force loading device that satisfies certain precision power value is provided; Be used for Micro-force sensor, MEMS and various little force detector are demarcated, and provide support for the dynamometric system of little small value force.

The utility model technical solution problem adopts following technical scheme:

The design feature of the horizontal micro-force loading device of the utility model differential type is that the second lever with vertical setting is a center-pole; In same perpendicular; A pair of one-level lever symmetry is divided the both sides that are in second lever, and connects mutually with second lever through the transiting rod of a side separately respectively;

Said one-level lever is inverted " L " type bar that is made up of horizon bar and vertical bar; Load counterweight and be arranged on rod end as the horizon bar of input end; The one-level fulcrum is positioned at the middle part of horizon bar; Vertically the bottom of bar is connected the outer end of transiting rod at the bar sidepiece through the one-level flexible hinge, and the inner of said transiting rod is connected on the force position of second lever through the secondary flexible hinge;

The bottom of said second lever is set to the secondary fulcrum, and the top of second lever is a free end, on the top of said second lever probe is set, and contacts with force transducer on being arranged on micromotion platform with said probe;

Connect firmly a pair of connecting rod that one side is extended towards the inner place of transiting rod in the outer end of said transiting rod, connect firmly the transiting rod balancing weight, make the center of gravity of said transiting rod adjust to place, secondary flexible hinge position at the rod end of said connecting rod; Horizon bar rod end place at said one-level lever is provided with one-level lever balancing weight, makes the center of gravity of said one-level lever adjust to one-level position of the fulcrum place; On said second lever, the position between secondary fulcrum and secondary flexible hinge is provided with the second lever balancing weight through the cantilever that connects firmly, and second lever, transiting rod, connecting rod and the common center of gravity of transiting rod balancing weight are adjusted on the position of secondary fulcrum.

The design feature of the horizontal micro-force loading device of the utility model differential type is at said one-level fulcrum and secondary position of the fulcrum place; One-level lever and second lever are respectively to be arranged on the pedestal through each supports flexible hinge; Said each supports flexible hinge is suspended on the support, becomes consistent with gravity direction.

Compared with present technology, the utility model beneficial effect is embodied in:

1, the utility model has been set up a kind of second lever power based on flexible hinge and lever principle and has been dwindled mechanism, is used to produce micro force, and Applications of Flexure Hinge has reduced the friction link in the calibration system, has improved stated accuracy.

2, the utility model utilizes the counterweight loading force, and is simple and reliable, easy to operate, can carry out dynamic load within the specific limits, can be widely used in multiple occasion.

3, the utility model at first makes the center of gravity of transiting rod adjust to secondary flexible hinge position through each balancing weight is set, and the common center of gravity of transiting rod that makes second lever then and have a counter weight construction is adjusted at secondary position of the fulcrum place; The center of gravity of one-level lever is adjusted on the one-level position of the fulcrum, has eliminated center of gravity and changed the influence that each rod member is caused, make little power of generation more stable, anti-interference factor is strong.

4, the utility model adopts symmetrical mechanism, has eliminated Influence of Temperature, has improved the loading accuracy of power.

5, each supports flexible hinge at the utility model one-level fulcrum and secondary fulcrum place all adopts and becomes consistent setting with gravity direction; Flexural deformation and bending stress that gravity causes flexible hinge have been eliminated; Otherwise, the destruction that the moment of flexure that gravity produces can cause flexible hinge.

Description of drawings

Fig. 1 is a horizontal micro-force loading device schematic diagram in the utility model;

Fig. 2 is a counter weight construction synoptic diagram on the utility model transiting rod;

Label among the figure: 1 second lever; The 1a cantilever; 1b second lever balancing weight; 2 transiting rods; The 2a connecting rod; 2b transiting rod balancing weight; The 3a horizon bar; The vertical bar of 3b; 4 load counterweight; 5 one-level fulcrums; 6 one-level flexible hinges; 7 secondary flexible hinges; 8 secondary fulcrums; 9 probes; 10 micromotion platforms; 11 force transducers; 12 one-level lever balancing weights.

Embodiment

Referring to Fig. 1, Fig. 2, include a pair of inverted " L " type one-level lever that constitutes by horizon bar 3a and vertical bar 3b, second lever 1 and a pair of transiting rod 2 in the present embodiment; And a pair of one-level lever balancing weight 12, a pair of transiting rod balancing weight 2b and second lever balancing weight 1b arranged;

Shown in Figure 1, be center-pole with the second lever 1 of vertical setting, in same perpendicular, a pair of one-level lever symmetry is divided the both sides that are in second lever 1, and connects mutually with second lever 1 through the transiting rod 2 of a side separately respectively;

The one-level lever is inverted " L " type bar that is made up of horizon bar 3a and vertical bar 3b; Load counterweight 4 and be arranged on rod end as the horizon bar 3a of input end; Loading counterweight 4 shown in Figure 1 hangs over horizon bar 3a and goes up formation one-level heap(ed) capacity F1a; One-level fulcrum 5 is positioned at the middle part of horizon bar 3a, and one-level fulcrum 5 is arranged on the pedestal through flexible hinge; Vertically the bottom of bar 3b is connected an end of transiting rod 2 at the bar sidepiece through one-level flexible hinge 6, and the other end of transiting rod 2 is connected on the force position of second lever 1 through secondary flexible hinge 7;

The bottom of second lever 1 is set to secondary fulcrum 8, and secondary fulcrum 8 is arranged on the pedestal through disciform flexible hinge; The top of second lever 1 is a free end, on the top of second lever 1 probe 9 is set, and contacts with force transducer 11 on being arranged on micromotion platform 10 with probe 9.Be to move in the horizontal direction in the practical implementation by micromotion platform 10 drive sensors 11.

In order to eliminate Influence of Temperature, the both sides that are distributed in second lever 1 of two one-level levers and two transiting rod 2 symmetries.

Change the influence that each rod member is caused in order to eliminate center of gravity; Balancing weight can be set respectively on the relevant position: the outer end that is included in transiting rod 2 connects firmly a pair of connecting rod 2a that one side is extended towards the inner place of transiting rod; Rod end at connecting rod 2a connects firmly transiting rod balancing weight 2b, makes the center of gravity of transiting rod 2 adjust to place, secondary flexible hinge 7 positions; Rod end place at the horizon bar 3a of one-level lever is provided with one-level lever balancing weight 12, makes the center of gravity of one-level lever adjust to the position of one-level fulcrum 5; On second lever 1; Position between secondary fulcrum 8 and secondary flexible hinge 7; Through the cantilever 1a that connects firmly second lever balancing weight 1b is set, second lever 1, transiting rod 2, connecting rod 2a and the common center of gravity of transiting rod balancing weight 2b are adjusted on secondary fulcrum 8 positions.

In the practical implementation, can remove transiting rod balancing weight 2b, but this loading accuracy that can exert all one's strength reduction, and the power value scope of dwindling loading force.

At one-level fulcrum and secondary position of the fulcrum place; One-level lever and second lever are respectively to be arranged on the pedestal through each supports flexible hinge; In order to eliminate flexural deformation and the bending stress that gravity causes flexible hinge; The destruction that the moment of flexure of avoiding gravity to produce causes flexible hinge, the flexible hinge at one-level fulcrum and secondary fulcrum place are all adopted and are become consistent setting with gravity direction.

Whole device produces little power by counterweight; Little power is much smaller than the quality of counterweight; And vertically the input end of the length of bar 3b and one-level lever is big more to the ratio of the distance of one-level fulcrum 5; The length of second lever 1 and secondary fulcrum 8 are big more to the ratio of the distance of secondary flexible hinge 7, then just can produce more little little power.

In the practical implementation, can realize the differential loading of the little power of level according to following dual mode:

Mode one, load the loading counterweight of equal in quality at two input ends, this moment, probe was on the initial position; Force transducer is set keeps motionless at initial position; Change the quality difference that two input ends load counterweight, the loading force that makes one of them input end is F1a, and the loading force of another input end is F1b; The power difference F1=F1a-F1b that is then loaded; This power difference is loaded on the force transducer 11 through probe after dwindling through flexure hinge mechanism, thereby obtains little power of different sizes;

Mode two, load the loading counterweight of equal in quality at two input ends; This moment, probe was on the initial position; Change the quality difference that two input ends load counterweight then, make probe skew occur, probe is progressively passed initial position from the position of skew by force transducer; Force transducer is near more apart from initial position; Probe is big more to the acting force of force transducer, and the displacement that finally loads quality difference and the force transducer of counterweight by two input ends determines the size of loading force, and a non-contact displacement transducer can be set at the probe place; Through theoretical analysis, numerical evaluation and experimental calibration, be based upon different two input ends and load the quality difference test pin biasing displacement of counterweight and the relation between loading force.

The utility model device can realize 10 ^-2The loading of following little power.

Claims

1. horizontal micro-force loading device of differential type; It is characterized in that the second lever (1) with vertical setting is a center-pole; In same perpendicular, a pair of one-level lever symmetry is divided the both sides that are in second lever (1), and connects mutually with second lever (1) through the transiting rod of a side (2) separately respectively;

Said one-level lever is inverted " L " type bar that is made up of horizon bar (3a) and vertical bar (3b); Loading counterweight (4) is arranged on the rod end of the horizon bar (3a) as input end; One-level fulcrum (5) is positioned at the middle part of horizon bar; Vertically the bottom of bar (3b) is connected the outer end of transiting rod (2) at the bar sidepiece through one-level flexible hinge (6), and the inner of said transiting rod (2) is connected on the force position of second lever (1) through secondary flexible hinge (7);

The bottom of said second lever (1) is set to secondary fulcrum (8), and the top of second lever (1) is a free end, and probe (9) is set on the top of said second lever, contacts with force transducer (11) on being arranged on micromotion platform (10) with said probe (9);

Connect firmly a pair of connecting rod (2a) that one side is extended towards the inner place of transiting rod in the outer end of said transiting rod (2); Rod end at said connecting rod (2a) connects firmly transiting rod balancing weight (2b), makes the center of gravity of said transiting rod (2) adjust to place, secondary flexible hinge (7) position; Horizon bar (3a) rod end place at said one-level lever is provided with one-level lever balancing weight (12), makes the center of gravity of said one-level lever adjust to the position of one-level fulcrum (5); On said second lever (1); The position that is positioned between secondary fulcrum (8) and the secondary flexible hinge (7) is provided with second lever balancing weight (1b) through the cantilever (1a) that connects firmly, and second lever (1), transiting rod (2), connecting rod (2a) and the common center of gravity of transiting rod balancing weight (2b) are adjusted on the position of secondary fulcrum (8).

2. according to the horizontal micro-force loading device of the said differential type of claim 1; It is characterized in that in said one-level fulcrum (5) and secondary fulcrum (8) position; One-level lever and second lever are respectively to be arranged on the pedestal through each supports flexible hinge; Said each supports flexible hinge is suspended on the support, becomes consistent with gravity direction.