CN102538919A - Force sensor structure - Google Patents
Force sensor structure Download PDFInfo
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- CN102538919A CN102538919A CN2011104499123A CN201110449912A CN102538919A CN 102538919 A CN102538919 A CN 102538919A CN 2011104499123 A CN2011104499123 A CN 2011104499123A CN 201110449912 A CN201110449912 A CN 201110449912A CN 102538919 A CN102538919 A CN 102538919A
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- bearing plate
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Abstract
The invention provides a force sensor structure, which comprises a displayer, a lower pressure bearing plate, a sensor group formed by three sensors which are arranged at 120-degree angles, an upper pressure bearing plate positioned above the sensor group, a pressure balance plate arranged on the sensor group and three push force joint bearings which are correspondingly positioned above the three sensors and between the pressure balance plate and the upper pressure bearing plate. The force sensor structure resolves the problem that an existing force sensor is prone to detection indication value deviation caused by working deformation of the upper pressure bearing plate and centralization error of articles to be detected.
Description
[technical field]
The present invention relates to a kind of load cell structure.
[background technology]
Force cell is a kind of after receiving the external force effect; Stick on elastomeric foil gauge and produce deformation thereupon and cause resistance variations, resistance variations makes one of the Wheatstone bridge out of trim output of composition and the device of the electric weight electric signal of the linear direct ratio variation of external force.Force cell is widely used in fields such as metallurgy, pharmacy, chemical industry, oil, weighing and force measurement system.Force cell is formed a kind of force cell of wide range usually by the sensor combinations of a plurality of little ranges.
Existing force cell 100 ' structure is as shown in Figure 1; Mainly comprise bearing plate 1 ', a sensor groups 2 by a plurality of sensors of along the circumferential direction evenly laying 21 ' constitute ' and one on bearing plate 3 ', every said sensor 21 ' all have the elastic body 211 that connects of floating each other ' with a centering regulate pressure head 212 '.When this force cell 100 ' bearing load F ' time; Its power F ' with distribution act on three elastic bodys 211 ' directly over; The size of three elastic body 211 ' three power of induction and set feed back on the display instrument (not shown) of force cell 100 therewith ' link to each other, and display instrument (not shown) shows the load of force cell 100 ' born then.If this force cell 100 of rotation ' or reinstall after imposed load F ' again; Distribution act on three elastic bodys 211 ' on magnitude of load and position with before state inconsistent; Three elastic body 211 ' three power of induction the size and the set feed back on the display instrument (not shown) indicating value with before will be variant, promptly force cell 100 ' rotation effect bad.In addition, when the bigger power of force cell 100 ' receive, last bearing plate can be out of shape.Thereby, existing force cell 100 ' structure, easily because of the distortion of last bearing plate 3 ' work, testee (not shown) error of centralization produce eccentric load, tilting load problem, and cause force cell 100 ' the detection indicating value produce deviation.
Present double bracket dish sky flat structure is uncle sieve Weir (Roberval) mechanism; The principle of uncle sieve Weir mechanism is as shown in Figure 2; In uncle sieve Weir mechanism; Cross bar AB, A ' B ' are connected with vertical pole AA ', BB ', pillar EE ' hinge, form two equal parallelogram AA ' E ' E and EE ' B ' B.When equal-sized power P, P ' act on the transverse arm of the left and right sides respectively, concerning pillar EE ', even the position of effect is asymmetric, also balance flatly.Reason is no matter how AB tilts, and AA ', BB ' are parallel with pillar EE ', from the left side of EE ', when the power P that will be d with the distance of vertical pole AA ' acts on the transverse arm, is used for A and A ' point with regard to there being one with P equal and opposite in direction, masterpiece that direction is identical; Simultaneously, the torque that a value is arranged is Pd is in vertical pole AA ', thereby pulls to the left side at the A lever of naming a person for a particular job, and pushes the right side at the A ' lever of naming a person for a particular job.But because lever receives E E ' restriction; On A, A ', will produce equal and opposite in direction, reacting force f, f ' in the opposite direction respectively, (or f ' s), and wherein s is the distance between f and the f ' thereby form an opposing torque fs who equates with Pd; Pd torque as a result is by fs (or s) torque of f ' institute balance; At last, on A, A ', have only with the identical power of P equal and opposite in direction direction and work, and irrelevant with the active position d of P on transverse arm.In like manner, the stressing conditions on EE ' right side is also identical.
[summary of the invention]
Technical matters to be solved by this invention is to provide a kind of load cell structure, has improved the accuracy that detects indicating value.
The present invention solves the problems of the technologies described above through following technical scheme: a kind of load cell structure comprises a display instrument, bearing plate, is the last bearing plate that sensor groups, that 120 ° of sensors of arranging constitute is positioned at the sensor groups top by three once; Said display instrument is connected with sensor groups; Said sensor groups places down on the bearing plate; And every said sensor all is located by connecting with following bearing plate; Every said sensor all contains an elastic body 211 and the centering that connects of floating each other regulates pressure head 212, and the longitudinal axis of this centering adjusting pressure head 211 and elastic body 212 coincides; This load cell structure comprises that also one is set up in the equal pressing plate on the sensor groups, and three corresponding respectively three sensor tops and thrust articulated bearings between this equal pressing plate and last bearing plate be located at; Every said sensor all is located by connecting with equal pressing plate; Every said thrust articulated bearing all is located by connecting with last bearing plate; And every said thrust articulated bearing all is fixedly connected with equal pressing plates, and the longitudinal axis of every said thrust articulated bearing all coincides with the longitudinal axis of respective sensor; Every said thrust articulated bearing all contains a ball seat and a bulb that floats and connect each other, and the longitudinal axis of this ball seat and bulb coincides.
Preferably, the bottom surface of said bulb is one second curved surface, and the upper surface of said ball seat is provided with the groove that matches with this second curved surface.
Preferably, said bulb is located by connecting through a connection piece and last bearing plate, and said ball seat is fixedly connected with equal pressing plate.
Preferably, the central authorities of said upward bearing plate, equal pressing plate and following bearing plate all are provided with an equal-sized through hole, and go up the through hole of bearing plate, all through hole, longitudinal axis coincidences of the through hole of bearing plate down of pressing plate.
The invention has the advantages that: adopt three thrust articulated bearings to match with three sensors; And said three thrust articulated bearings and three structures that sensor is accepted through equal pressing plate have solved existing force cell and have produced the problem of deviation because of last bearing plate work distortion, the testee error of centralization cause the detection indicating value of force cell easily.
[description of drawings]
Combine embodiment that the present invention is done further description with reference to the accompanying drawings.
Fig. 1 is the perspective view of existing force cell.
Fig. 2 is uncle sieve Weir mechanism principle figure.
Fig. 3 is the perspective view of the force cell among the present invention (removing decapsidate).
Fig. 4 is for the thrust articulated bearing among the present invention and last bearing plate, all pressing plate cooperates figure (wherein partly analysing and observe).
Fig. 5 is the vertical view of the force cell among the present invention.
Fig. 6 is the fundamental diagram of the force cell among the present invention.
[embodiment]
Said unsteady connection is meant that an object places on another object, does not connect through any intermediary between the two articles.
See also Fig. 3; A kind of force cell 100 structures comprise a display instrument (not shown), bearing plate 1, is sensor groups that 120 ° of sensors of arranging 21 constitute 2, a bearing plate 3, on above the sensor groups 2 by three and is set up in that equal pressing plate 4 on the sensor groups 2, three are corresponding respectively to be located at above three sensors 21 and thrust articulated bearing 5 between this equal pressing plate 4 and last bearing plate 3 once.Said display instrument (not shown) is connected with sensor groups 2; Said sensor groups 2 places down on the bearing plate 1, and every said sensor 21 is all with following bearing plate 1, all pressing plate 4 is located by connecting.Every said sensor 21 all contains an elastic body 211 and the centering that connects of floating each other regulates pressure head 212; Said elastic body 211 is inserted in the housing 213, and the upper surface of this elastic body 211 is a first surface 2111; Said centering is regulated pressure head 212 and is located by connecting with equal pressing plate 4; Be that every said sensor 21 is all regulated pressure head 212 through corresponding centering and is located by connecting with equal pressing plates 4, and this centering bottom surface of regulating pressure head 212 is provided with first groove 2121 that matches with said first surface 2111; The longitudinal axis that said centering is regulated pressure head 211 and elastic body 212 coincides.
Shown in Fig. 3-4, every said thrust articulated bearing 5 all is located by connecting with last bearing plate 3, and every said thrust articulated bearing 5 all is fixedly connected with equal pressing plate 4.The longitudinal axis of every said thrust articulated bearing 5 all coincides with the longitudinal axis of respective sensor 21; Every said thrust articulated bearing 5 all contains a bulb 51 and a ball seat 52 that floats and connect each other; Said bulb 51 is located by connecting through a connection piece 6 and last bearing plate 3, and the bottom surface of this bulb 51 is one second curved surface 511; Said ball seat 52 is fixedly connected with equal pressing plates 4, and the upper surface of this ball seat 52 is provided with second groove 521 that matches with this second curved surface 511; The longitudinal axis of said bulb 51 and ball seat 52 coincides.
Please consult Fig. 3 again, the said upper surface of going up bearing plate 3 is provided with the pilot hole 31 that three confessions and other parts (not shown) are located by connecting, and said three pilot holes 31 adopt and three settings that thrust articulated bearing 5 staggers each other and arranges.In order when reality is used, to make things convenient for sensor installation; Said central authorities of going up bearing plate 3, equal pressing plate 4 and following bearing plate 1 all also can be provided with an equal-sized through hole; And the through hole 7 of last bearing plate 3, all through hole (not shown), longitudinal axis coincidences of the through hole 9 of bearing plate 1 down of pressing plate 4 are to satisfy use needs of the present invention.
Please consult Fig. 5 again, appearance of the present invention can be coated with a shell 8, with convenient force cell 100 and the protection force cell 100 of using.
Please consult Fig. 6 again, Fig. 6 is a fundamental diagram of the present invention, and for clarity sake, this paper places three sensor 21 (see figure 3)s and carries out principles illustrated on the same straight line.Describe for convenient; In Fig. 6; The applicant carries out carrying out mark with letter character to some parts, and three thrust articulated bearing 5 (see figure 3)s are labeled as M, N, R from right to left successively, centering is regulated pressure head 212 (see figure 3)s be labeled as M ', N ', R ' from right to left successively.Among Fig. 6, M (thrust articulated bearing), N (thrust articulated bearing), R (thrust articulated bearing), M ' (centering is regulated pressure head), N ' (centering is regulated pressure head), R ' (centering is regulated pressure head), go up bearing plate 3 and all pressing plate 4 promptly constitute uncle sieve Weir mechanism.Because bulb 51 (see figure 3)s in thrust articulated bearing 5 (see figure 3)s all are that curved surface contacts with ball seat 52 (see figure 3)s; Centering is regulated between pressure head 212 (see figure 3)s and elastic body 211 (see figure 3)s also for curved surface contact, thereby M (thrust articulated bearing), N (thrust articulated bearing), R (thrust articulated bearing), M ' (centering is regulated pressure head), N ' (centering adjusting pressure head), R ' (centering adjusting pressure head) two equal parallelogram MM ' N ' N of composition and NN ' R ' R.When bearing load F of the present invention, load F distributes and acts on three elastic body 211 tops, if load F skewness, asymmetric or go up bearing plate 3 distortion causes bearing plate 3 inclinations, then no matter goes up bearing plate 3 and how to tilt, and MM ', RR ' are parallel with NN '.When the distributed load on the last bearing plate 3 is that component F1 is when being in apart from elastic body 211 for the position of d; Just there is one to be used for M (thrust articulated bearing) and M ' (centering is regulated pressure head) with the identical masterpiece of F1 equal and opposite in direction direction; The torque that just have a numerical value this moment is F1d is between MM '; Thereby at the M place M (thrust articulated bearing) is pulled to the right side, locate to push M ' (centering is regulated pressure head) to left side, but owing to receive the restriction of NN ' (being that thrust articulated bearing N and centering are regulated pressure head N ') point at M '; On M (thrust articulated bearing) and M ' (centering is regulated pressure head), will produce equal and opposite in direction, reacting force f1, f2 in the opposite direction respectively; Thereby the opposing torque (s is the distance between f1 and the f2) that to form a numerical value that equates with F1d be f1s (or f2s), F1d torque as a result are last by f1s (or f2s) institute balance; On M (thrust articulated bearing) and M ' (centering is regulated pressure head), have only and work with the identical power of F1 equal and opposite in direction direction; And irrelevant with eccentric position and eccentric distance, in like manner, this situation goes up at N (thrust articulated bearing) and N ' (centering is regulated pressure head), also identical on R (thrust articulated bearing) and the R ' (centering is regulated pressure head).Therefore when the present invention being applied a load F and is directed force F; No matter the rotation or change installment state of the present invention; Twice numerical value difference was very little before and after display instrument (not shown) showed, thereby the present invention has good rotation effect, and detection indicating value repdocutbility promptly of the present invention is good.
The present invention adopts three thrust articulated bearings 5 to match with three sensors 21; And said three thrust articulated bearings 5 and three structures that sensor 21 is accepted through equal pressing plate 4; The present invention can effectively be reduced because the error that 3 work of last bearing plate are out of shape, testee (not shown) error of centralization produces eccentric load, tilting load is brought; Improve the accuracy of the detection indicating value of force cell 100, solved the problem of the detection deviation of reading that present force cell 100 ' structure caused because of last bearing plate work distortion, the tested sensor error of centralization easily.
Claims (4)
1. load cell structure comprises a display instrument, bearing plate, is the last bearing plate that sensor groups, that 120 ° of sensors of arranging constitute is positioned at the sensor groups top by three once; Said display instrument is connected with sensor groups; Said sensor groups places down on the bearing plate, and every said sensor all is located by connecting with following bearing plate, and every said sensor all contains an elastic body and the centering that connects of floating each other regulates pressure head, and this centering is regulated pressure head and the elastomeric longitudinal axis coincides; It is characterized in that: this load cell structure comprises that also one is set up in the equal pressing plate on the sensor groups, and three corresponding respectively three sensor tops and thrust articulated bearings between this equal pressing plate and last bearing plate be located at; Every said sensor all is located by connecting with equal pressing plate; Every said thrust articulated bearing all is located by connecting with last bearing plate; And every said thrust articulated bearing all is fixedly connected with equal pressing plates, and the longitudinal axis of every said thrust articulated bearing all coincides with the longitudinal axis of respective sensor; Every said thrust articulated bearing all contains a bulb and a ball seat that floats and connect each other, and the longitudinal axis of this bulb and ball seat coincides.
2. a kind of load cell structure as claimed in claim 1 is characterized in that: the bottom surface of said bulb is one second curved surface, and the upper surface of said ball seat is provided with the groove that matches with this second curved surface.
3. according to claim 1 or claim 2 a kind of load cell structure, it is characterized in that: said bulb is located by connecting through a connection piece and last bearing plate, and said ball seat is fixedly connected with equal pressing plates.
4. a kind of load cell structure as claimed in claim 1; It is characterized in that: the central authorities of said upward bearing plate, equal pressing plate and following bearing plate are equipped with an equal-sized through hole, and go up the through hole of bearing plate, all through hole, longitudinal axis coincidences of the through hole of bearing plate down of pressing plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110449912.3A CN102538919B (en) | 2011-12-28 | 2011-12-28 | Force sensor structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110449912.3A CN102538919B (en) | 2011-12-28 | 2011-12-28 | Force sensor structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102538919A true CN102538919A (en) | 2012-07-04 |
| CN102538919B CN102538919B (en) | 2014-01-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110449912.3A Active CN102538919B (en) | 2011-12-28 | 2011-12-28 | Force sensor structure |
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| CN (1) | CN102538919B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103115759A (en) * | 2013-01-14 | 2013-05-22 | 合肥工业大学 | Special component applied on test specimen bottom for simulating clamped boundary axial load |
| CN105716746A (en) * | 2016-04-12 | 2016-06-29 | 肖军 | Force measurement method for switching external force measurement into internal measurement and force measurement device adopted by same |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0560624A (en) * | 1990-12-26 | 1993-03-12 | Hitachi Constr Mach Co Ltd | Load detector |
| JPH11304606A (en) * | 1998-04-27 | 1999-11-05 | Showa Sokki:Kk | Load cell |
| CN2559972Y (en) * | 2002-01-14 | 2003-07-09 | 张立群 | Load sensor |
| CN101033999A (en) * | 2007-01-25 | 2007-09-12 | 西安交通大学 | Opening type anti-eccentric-loading three elastic cylinders load cell |
| JP2007315923A (en) * | 2006-05-25 | 2007-12-06 | Kyowa Electron Instr Co Ltd | Center hole type load transducer |
| CN201340293Y (en) * | 2009-01-15 | 2009-11-04 | 东莞市华兰海电子有限公司 | Column weighting sensor |
| CN201803816U (en) * | 2010-09-28 | 2011-04-20 | 苏州龙盛测试设备有限公司 | Combined transducer force-measuring device |
| CN202403777U (en) * | 2011-12-28 | 2012-08-29 | 福建省计量科学研究院 | Force measurement sensor structure |
-
2011
- 2011-12-28 CN CN201110449912.3A patent/CN102538919B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0560624A (en) * | 1990-12-26 | 1993-03-12 | Hitachi Constr Mach Co Ltd | Load detector |
| JPH11304606A (en) * | 1998-04-27 | 1999-11-05 | Showa Sokki:Kk | Load cell |
| CN2559972Y (en) * | 2002-01-14 | 2003-07-09 | 张立群 | Load sensor |
| JP2007315923A (en) * | 2006-05-25 | 2007-12-06 | Kyowa Electron Instr Co Ltd | Center hole type load transducer |
| CN101033999A (en) * | 2007-01-25 | 2007-09-12 | 西安交通大学 | Opening type anti-eccentric-loading three elastic cylinders load cell |
| CN201340293Y (en) * | 2009-01-15 | 2009-11-04 | 东莞市华兰海电子有限公司 | Column weighting sensor |
| CN201803816U (en) * | 2010-09-28 | 2011-04-20 | 苏州龙盛测试设备有限公司 | Combined transducer force-measuring device |
| CN202403777U (en) * | 2011-12-28 | 2012-08-29 | 福建省计量科学研究院 | Force measurement sensor structure |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103115759A (en) * | 2013-01-14 | 2013-05-22 | 合肥工业大学 | Special component applied on test specimen bottom for simulating clamped boundary axial load |
| CN103115759B (en) * | 2013-01-14 | 2015-06-24 | 合肥工业大学 | Special component applied on test specimen bottom for simulating clamped boundary axial load |
| CN105716746A (en) * | 2016-04-12 | 2016-06-29 | 肖军 | Force measurement method for switching external force measurement into internal measurement and force measurement device adopted by same |
| CN105716746B (en) * | 2016-04-12 | 2019-02-12 | 肖军 | A kind of force measuring method and its device for measuring force converting external force measurement to internal force measurement |
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| Publication number | Publication date |
|---|---|
| CN102538919B (en) | 2014-01-15 |
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