CN201203474Y - Balance self-calibration mechanism - Google Patents
Balance self-calibration mechanism Download PDFInfo
- Publication number
- CN201203474Y CN201203474Y CNU2008200593543U CN200820059354U CN201203474Y CN 201203474 Y CN201203474 Y CN 201203474Y CN U2008200593543 U CNU2008200593543 U CN U2008200593543U CN 200820059354 U CN200820059354 U CN 200820059354U CN 201203474 Y CN201203474 Y CN 201203474Y
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- CN
- China
- Prior art keywords
- counterweight
- cam
- correcting
- balance
- lever assembly
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- Expired - Lifetime
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Abstract
The utility model discloses a balance self-calibrating mechanism comprising an electric machine, a cam, lever components, a counterweight, a loading part, wherein, the cam is fixedly connected with an output shaft of the electric machine, external edges of the cam are movably connected with lever components, the rotation of the cam drives the lever components to rotate, the lever components drive the counterweight to make it connect and separate with the loading part, the counterweight is connected with the loading part for performing balance self-calibration when separating with the lever components, when the counterweight is separated with the loading part and is connected with the lever components, normal weighing is performed. The mechanism has simple structure, convenient use and low manufacture cost, can be extensively used for various balances.
Description
Technical field
The utility model relates to the instrument and meter member, and more particularly, it relates to the balance aligning gear.
Background technology
In order to guarantee the accuracy of weighing, precision balance or analytical electron balance generally need carry out range calibration before using.In the past, people normally bought the high precision counterweight balance were carried out manual calibration, and this brings greater inconvenience for the user of balance: one, and the user must additionally buy the high precision counterweight; Its two, manual operation is very not convenient, is easy to generate error; Its three, counterweight keeping inconvenience and easily losing.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of balance self-correcting mechanism of compact conformation is provided, and realizes the self-correcting function of precision balance or analytical balance.
The purpose of this utility model is achieved through the following technical solutions; according to the balance self-correcting mechanism that the utility model proposes; comprise: motor, cam, lever assembly, counterweight, load bearing component; wherein camshaft links to each other with the output shaft of motor; the outer rim and the lever assembly of cam are movably connected; the rotation of cam drives lever assembly and rotates, and lever assembly drives counterweight, it is linked to each other with load bearing component and separates.Counterweight links to each other with load bearing component, and when separating with lever assembly, carries out the self-correcting of balance; Counterweight separates with load bearing component, and when linking to each other with lever assembly, balance carries out normal weighing.Load bearing component links to each other with balance sensor.
Described cam can be right cylinder, and cam rotation axis deviation right cylinder center line is provided with.Preferably, described cam is a cylinder, four sections curves of the outer cause of its xsect are formed, wherein go up circular arc and be respectively the circular arc that radius is different, the center of circle is identical with following circular arc, the smooth transition curve of middle both sides is transcendental curve (as sinusoidal curve or cosine curve) or higher order polynomial curve, and the cam rotation axle center is arranged at the together circle center place of circular arc and following circular arc.More preferably, the smooth transition curve of middle both sides is the 3-4-5 polynomial curve, curve equation such as S (φ)=a φ
3+ b φ
4+ c φ
5Be provided with like this, can make the lever assembly that is movably connected with cam when rotating, not have the acceleration sudden change, rotate level and smooth; Being provided with of upper and lower arc section can guarantee in certain angle, drives by cam rotation that lever assembly lifts or the height of the counterweight of loweing meets the requirements, thereby reduced the control requirement to the motor running accuracy.
For the lower occasion of balance accuracy requirement, described counterweight can be one, is placed in a side of balance sensor, and at this moment, the tray on the lever assembly also can only be provided with one, thereby reduces cost.To the balance accuracy requirement when higher, matter counterweights such as two or matter counterweight such as approximate can be set, and be symmetrically distributed in the both sides of balance sensor.Like this, can make lever assembly stressed more even, and can effectively reduce the caused calibration error of four angular displacement.Certainly as required, also more counterweight can be set.Refer to equiponderant counterweight etc. the matter counterweight, matter counterweight such as approximate refers to that weight differs less counterweight, all be to use counterweight always.
Described motor is preferably reducing motor, so that rotating speed is controlled.
More firm for motor is installed, also electric machine support can be set, motor, camshaft and electric machine support are connected; be that camshaft one end links to each other with motor output shaft, the other end links to each other with motor fixed rack, and electric machine support is as bearing; like this, make the compact conformation and the good rigidly of self-correcting mechanism.
Also can in above-mentioned self-correcting mechanism, the counterweight securing cover plate be set,,, improve stability when unloaded state with the protection counterweight so that counterweight is fixed well.When this cover plate is set, need make its height make accurate match with cam arc radius, lever assembly rising height and counterweight size etc.
Also can in reducing motor, assemble the output shaft position transducer.The output of this sensor feeds back to the control circuit of motor, and the position of cam can more easily be controlled on the desired position.
By structural arrangements mode of the present utility model,, can realize the automatic calibration of balance owing to be provided with self-correcting mechanism in the balance.The utility model compact conformation, easy to use, low cost of manufacture is with a wide range of applications.
Description of drawings
Fig. 1 is the structural representation of the utility model self-correcting mechanism preferred embodiment.
Fig. 2 is the cam synoptic diagram.
Fig. 3 is the cam cross sectional representation.
Fig. 4 is the lever assembly synoptic diagram.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:
As accompanying drawing 1, Fig. 2, shown in Figure 3, the balance self-correcting mechanism of this embodiment comprises reducing motor 4, cam 5, lever assembly 7, counterweight 8, load bearing component 3, electric machine support 6, counterweight securing cover plate 9, wherein, camshaft 5-1 one end links to each other with reducing motor 4 output shafts, and the other end is supported in electric machine support 6; Reducing motor 4 is fixed on the support 6, and electric machine support 6 is installed on the base 1 of electronic balance.Matter counterweights 8 such as two are arranged on the lever assembly tray 7-5, and load bearing component 3 links to each other with balance sensor 2, is set to hook shape; Cover plate 9 is installed on the base 1, and is arranged on counterweight 8 tops.
As accompanying drawing 2 and shown in Figure 3, cam 5 is column, and its xsect is made up of four sections curves, and epimere and hypomere are circular arc, and last circular arc 5-2 radius is greater than following circular arc 5-3, and smooth transition is made by polynomial curve 5-5 in middle both sides, curve equation such as S (φ)=10 φ
3-15 φ
4+ 6 φ
5Cam rotation axle center 5-1 is arranged at the together circle center 5-4 place of circular arc 5-2 and following circular arc 5-3.
As shown in Figure 4, lever assembly 7 similar Y types, lever parent 7-1 and pin 7-3 are hinged, and bipod 7-3 is installed on the base 1, and jointed shaft is as lever fulcrum shaft 7-4.In the middle of the leverage tail end projection 7-2 being set contacts with the outer rim of cam 5.Hinged two the tray 7-5 of two arms of lever assembly 7.
When balance is carried out self-correcting, reducing motor 4 rotate to make cam 5 roundlet arc 5-3 down, because of action of gravity, leverage 7 rotates around fulcrum shaft 7-4,7-2 raises with the contacted lever tail end of roundlet arc 5-3 outer rim projection, the front end tray 7-5 of lever assembly 7 descends, both sides counterweight 8 is followed tray 7-5 and is descended on the hook that places as load bearing component 3, lever assembly front end tray 7-5 continues to descend, and separate fully with counterweight 8, be supported at last on the base 1, at this moment, counterweight 8 links to each other with load bearing component 3, and separates with lever assembly 7.Because of load bearing component 3 is to link to each other with balance sensor 2, so can carry out the self-correcting of balance.
After self-correcting is finished, for making the normal weighing of balance, need unloading counterweight 8, at this moment, reducing motor 4 rotated to make on the cam 5 circular arc down, its outer rim is depressed lever tail end projection 7-2 contacted with it, make lever assembly 7 around fulcrum shaft 7-4 rotation, lift two arms from face, the tray 7-5 on two arms raises counterweight 8, break away from load bearing component 3, and place under the cover plate 9.Be fixing counterweight better, the height setting of cover plate 9 has been considered the factors such as displacement, counterweight size of raising of tray 7-5, and cover plate 9 just in time can be joined with counterweight 8, but not overslaugh counterweight 8 is raised.At this moment, counterweight separates with load bearing component 3, and is fixed between lever assembly tray 7-5 and the cover plate 9.
Also the output shaft position transducer can be installed in the reducing motor 4, this signal of sensor feeds back to circuit for controlling motor, rotates to two required positions thereby control cam 5 effectively.
The above, it only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, every foundation technical spirit of the present utility model is to any simple modification, equivalent variations or modification that above embodiment did, as the variation of counterweight shape, the variation of lever assembly shape, the change of motor output shaft position transducer installation site etc., all belong within the scope of technical solutions of the utility model.
Claims (8)
1. balance self-correcting mechanism; comprise: motor (4), cam (5), lever assembly (7), counterweight (8), load bearing component (3); its cam is fixedlyed connected with the output shaft of motor; cam outer rim and lever assembly flexibly connect; the rotation of cam drives lever assembly and rotates; lever assembly drive counterweight makes it link to each other with load bearing component and separates; counterweight and load bearing component link to each other and carry out the balance self-correcting when separating with lever assembly; counterweight separates with load bearing component and when linking to each other with lever assembly, balance carries out normal weighing.
2. balance self-correcting as claimed in claim 1 mechanism; it is characterized in that: described cam (5) is a cylinder; four sections curves of the outer cause of its xsect are formed; wherein go up circular arc (5-2) and be respectively the circular arc that radius is different, the center of circle is identical with following circular arc (5-3); the smooth transition curve of middle both sides is transcendental curve or higher order polynomial curve (5-5), and cam rotation axle center (5-1) is arranged at circular arc and locates with the together circle center (5-4) of following circular arc.
3. balance self-correcting as claimed in claim 1 or 2 mechanism, it is characterized in that: described counterweight (8) is one.
4. balance self-correcting as claimed in claim 1 or 2 mechanism is characterized in that: described counterweight (8) is matter counterweights such as two or matter counterweight such as approximate, and is distributed in the both sides of balance sensor (2).
5. balance self-correcting as claimed in claim 4 mechanism, it is characterized in that: described motor (4) is a reducing motor.
6. balance self-correcting as claimed in claim 5 mechanism, it is characterized in that: also comprise electric machine support (6), cam rotation axle center (5-1) and motor (4) are connected with electric machine support (6).
7. balance self-correcting as claimed in claim 6 mechanism is characterized in that: also comprise counterweight securing cover plate (9).
8. balance self-correcting as claimed in claim 7 mechanism, it is characterized in that: reducing motor is equipped with the output shaft position transducer in (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200593543U CN201203474Y (en) | 2008-06-04 | 2008-06-04 | Balance self-calibration mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200593543U CN201203474Y (en) | 2008-06-04 | 2008-06-04 | Balance self-calibration mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201203474Y true CN201203474Y (en) | 2009-03-04 |
Family
ID=40425786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200593543U Expired - Lifetime CN201203474Y (en) | 2008-06-04 | 2008-06-04 | Balance self-calibration mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201203474Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977078A (en) * | 2014-03-28 | 2015-10-14 | 梅特勒-托利多公开股份有限公司 | Robot-actuated door-opening device for a draft shield enclosure of an analytical scale |
-
2008
- 2008-06-04 CN CNU2008200593543U patent/CN201203474Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977078A (en) * | 2014-03-28 | 2015-10-14 | 梅特勒-托利多公开股份有限公司 | Robot-actuated door-opening device for a draft shield enclosure of an analytical scale |
| CN104977078B (en) * | 2014-03-28 | 2020-03-13 | 梅特勒-托莱多有限公司 | Automatic mechanically actuated door opener for a mobile housing of an analytical balance |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090304 |