CN85104807B - Multi-range load cell - Google Patents
Multi-range load cell Download PDFInfo
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- CN85104807B CN85104807B CN 85104807 CN85104807A CN85104807B CN 85104807 B CN85104807 B CN 85104807B CN 85104807 CN85104807 CN 85104807 CN 85104807 A CN85104807 A CN 85104807A CN 85104807 B CN85104807 B CN 85104807B
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Abstract
The utility model relates to a resistance strain type multi-range force measuring sensor, which overcomes the defects that the existing multi-range force measuring sensor has complicated structure, many parts, poor rigidity, and the process performance and precision are not easily ensured. The invention designs a spoke type I-shaped integrated body. The composite elastomer of the structure can easily realize the three-range, four-range load cell with each range starting from zero, and can also be made into a two-range load cell. It can be used for static or dynamic force measurements and can be measured continuously in segments over the full scale range. Therefore, it ensures that the measurement accuracy of each sub-section is improved over the full-scale range during the measurement of the continuous working force value with a large change in measurement amplitude. It can be installed in the vertical direction to the horizontal direction of 90 degrees.
Description
A kind of resistance strain type multi-broad force detecting sensor, it can be for static force or dynamic force measurement; Be used for measuring retarding torque, drag torque, pulling force, force of compression, thrust etc.
At present, single range force detecting sensor of two different ranges of handlebar is connected in series and realizes the method (JP-A-57147025) that double-range is measured both at home and abroad, sees Fig. 1.Also the single dynamometry elastomer group of handlebar is assembled into altogether multi-range load cell and realizes multi-range measurement (JP-A-5991327, US-A-4282762, SU-A-732704), sees Fig. 2,3,4.They are compared with single range force detecting sensor, can realize the measurement of multirange power value, and have improved to a certain extent the measuring accuracy of force cell lower range section.But because these strain-type force sensors are all the dynamometry elastic bodys that has adopted separation structure, adopt the way of combination.Therefore, no matter from the guarantee of processing technology, equipment adjustment technique, and the raising of sensor accuracy, the aspects such as the expansion of range of application are all subject to certain restrictions.While particularly wanting to increase multiple range range number, while namely thinking to increase sectional number again within the scope of gamut, structurally will be more complicated, implement just very difficult.On an elastic body, make the technology in different elastic strains district, only find to be disclosed in Japanese patent application JP-A-5912326, see Fig. 5.
One of object of the present invention be to provide a kind of simple in structure, shop characteristic good, volume is little, weight is light, good rigidly, precision are high, applied range for measuring the multirange strain-type force sensor of retarding torque, drag torque, pulling force, force of compression, thrust.Another object of the present invention is under above-mentioned condition, to provide one can be in the vertical direction install and use to optional position within the scope of 90 degree of horizontal direction and do not need the multi-range load cell of other auxiliary parts meeting.It is to start from scratch that a further object of the present invention is to provide a kind of each range, and within the scope of gamut, does not lose continuously the multi-range load cell of measuring accuracy point section.
The present invention is achieved in that force cell except having a load pressure head and chassis, also has the composite elastic body of an I-shaped integrative-structure of radial, it is by the spoke shape body of upper and lower two different geometrical size, and the middle composite elastic body being connected along three's axis with cylinder (solid or hollow) forms.Also can by be above a spoke shape body and below two in same plane, the spoke shape body of concentric, the composite elastic body being connected as a body along their axis with cylinder between upper lower spokes shape body forms.On the composite elastic body of these two kinds of versions, there are respectively three or four rigidity differences, strain regions that natural frequency is different, therefore, can have the output of three or four ranges.Obviously,, as long as relax with structural house and get through technologic part, can be used as dual-range force detecting sensor and use.
In the present invention, be the part that assisted recombination elastic body bears acting force with the joining load pressure head of composite elastic body and chassis, form the change gap (being simultaneously also overload protection gap) between multirange with it and composite elastic body simultaneously.The size in these gaps is obtained by the distortion accurate Calculation producing after acting force according to composite elastic body, thereby can make two or three after predetermined load, obtain immediately range conversion accurately and overload protection reliably compared with the strain position of lower range bearing.
Composite elastic body relies on wheel hub the one that connects to of each stressed site of action rigidity own, simultaneously because the middle part of wheel hub is also the strain regions of sensor measurement high range power value, so it is designed to column entity or hollow cylinder all has very high strength and stiffness, be enough to keep each strain regions reliability and stability in the course of the work on composite elastic body.
This sensor can according to design needs: at the corresponding position, each strain regions of composite elastic body adhering resistance strain sheets, and form measuring bridge group, to form multiple range strain-type force sensor such as stress, shear stress, pressure (or drawing) stress by bending.
The present invention has adopted the composite elastic body of the I-shaped integrative-structure of radial in version, by making elongation, the shortening of this this body structure of elastic body, and the increase and decrease of spoke and extend can obtain multiple strain regions, thereby be designed to very easily as required three ranges or four-range force cell, and the auxiliary component of having avoided chorista knot ditch elastic body thereupon to bring becomes 3-4 doubly to increase with single elastic body number in the time of recruitment number of passes.
Second, from performance, because elastic body of the present invention is the I-shaped integrative-structure form of radial, can keep spoke strain beam and pillar strain regions (wheel hub) reliability and stability in the course of the work, make it there is the feature of stronger anti-bias load and lateral force resistance.The composite elastic body of it and separation structure is compared, need not increase guide rail pair or auxiliary support member and the connector of any sliding-rolling friction, and any irrational, may give support that the key technical indexes such as nonlinearity, hysteresis, nonrepeatability of sensor brings adverse effect, connection, contact plane, contact point etc., the factor that makes sensor produce error greatly reduces.That is to say, can improve the precision of multi-range load cell.
The 3rd, due to above-mentioned two factors, multi-range load cell of the present invention can be installed and used arbitrarily in the vertical direction within the scope of horizontal direction 90 degree, thereby expanded range of application.
The 4th, each range of multi-range load cell of the present invention can be designed to the form of dual output, and obtaining of the data of the disposable measurement that therefore can not repeat for those provides reliable guarantee, namely improved the reliability of sensor.
The 5th, each range of sensor of the present invention is to start from scratch, and in full range, can divide section ground to measure continuously.Therefore, it has ensured to change in the measuring process of continuous working power value greatly at measuring amplitude, has improved the measuring accuracy of each section within the scope of gamut.As everyone knows, within the scope of gamut, range section is got more, and each sectional measuring accuracy is higher.
The present invention can be applicable to the weighing of various goods and materials, the metering of power value, and in various dynamic force measurement engineering.
One, for the weighing of goods and materials.
For example: in supply station of materials and equipment or warehouse handling goods weighing be to be all exactly that (or one group) force cell is added Displaying Meter or printer with the metering section of mobile crane, crane conventionally, in handling goods, realized automatic gauge, valuation.Using single range sensors in the situation that, lifting capacity is the crane of 20 tons, just can only load and unload those weight large, the goods that price is low.But the specification of the extensive handling goods in supply station of materials and equipment or warehouse, weight are often quite disperseed, if various kinds, specification, the different goods of weight classes are carried out conveniently, are measured accurately, adopt multi-range load cell to be arranged on crane, just can facilitate, rapidly, automatic gauge exactly.In like manner, in departments such as business, grain, goods and materials, and the industrial sector such as machinery, metallurgy, transport can be applied.
Two, for measurement verification department
For example, in measurement verification department, examine and determine 15 tons of second grade standard dynamometers, in verification process, will use three or four ranges single range High Precision Strength Measurement Sensor not etc.Because in the time that range reduces, if do not used the sensor of corresponding range instead, calibration accuracy will reduce at double.If use three ranges or four-range force cell, can ensure calibration accuracy, make the time of calibration operation and program greatly shorten simultaneously, improve work efficiency.
Three, for the test of dynamic force
For example: measure dynamic force in some engineering time, the work of test macro can not optionally be interrupted or repeat, the change that can not carry out force cell in measuring process is replaced.The power of dynamic force is worth time dependent curve as shown in Fig. 6 (a).In figure, abscissa is time t (second); Ordinate is ergometry value F (ton).If adopt multi-range load cell of the present invention, can in full range, point Chengdu be zero-based four ranges:: O-F
1; O-F
2; O-F
3; O-F
4.Thereby increase each sectional electrical output signal, reduce the impact of electrical noise, namely make each range can obtain best output signal, improved each sectional measuring accuracy, make test job extension in time in the situation that range has conversion carry out the continuous measurement of not losing precision.
Fig. 6 (b) is the output characteristic curve of four quantum force cell.Abscissa is ergometry value F (ton); Ordinate is sensor output value Vs (mV/V).M, N, Q, W are respectively the output characteristic curves of four corresponding ranges.In the time that the power value of lower range section exceedes its range, become state of saturation, and maximum amount journey is from O-F
4linear in scope.
According to the needs of Practical Project test, each range of this multi-range load cell can adopt the form of dual output, and namely each range can connect to two test macros simultaneously.So just can form have at most four ranges, totally eight groups of measuring bridge (R
1～R
8) obtain eight road electric signal outputs, and all can carry out respectively independent measurement, be independent of each other.
Fig. 7 is the measurement system diagram of four quantum force cell.
Below by embodiment, structural feature of the present invention and course of action are described:
Embodiment mono-:
Fig. 8 is the schematic diagram of three range force detecting sensors.
This sensor comprises load pressure head (1), composite elastic body (2), chassis (3) and sticks on resistance strain gage (5), (6) and (8) on strain beam (22), lower strain beam (25) and wheel hub (23), also has in addition shell etc. not draw.The circular planes rigid attachment of wheel rim (21) on the lower plane outer ring part of load pressure head (1) and composite elastic body, forms by the upper surface (201) of wheel hub (23) and the lower plane of load pressure head (1) the change gap δ that has determined lower range
1.The lower circular planes of the lower wheel rim (24) of chassis (3) and composite elastic body (2) is also rigid attachment, so just by forming the change gap δ that has determined middle range between the lower surface (202) of wheel hub (23) and chassis (3)
2.
Between wheel hub (23) top and upper wheel rim (21), be strain beam (22) (being lower range strain beam) on cruciform symmetrical in circumference range, it is designed to the bent beam of stress (also can be the shear beam that is subject to shear stress) by bending.Between wheel hub (23) bottom and lower wheel rim (24), also be strain beam (25) under cruciform symmetrical in circumference range) (range strain beam), two strain beams (22), the section of (25) is unequal, and lower strain beam is the shear beam that is subject to shear stress.Wheel hub (23)) (being high range strain cylinder) be the column type elastomer of compression chord.
Course of action is as follows:
In the time that load F is applied on half body of load pressure head (1), it just load F along the lower plane outer ring Transmit evenly of load pressure head to wheel rim on composite elastic body (21), be applied to chassis (3) through upper strain beam (22), wheel hub (23), lower strain beam (25), lower wheel rim (24) upper, when load is increased to F from zero
1time, upper strain beam (22) deforms, and sticking on the measuring bridge that the resistance strain gage (5) on strain beam forms just has output, load O-F just can be detected
1.
As the load F>=F being applied on load pressure head (1)
1time, range change gap δ
1closure is zero.Prevent the F because of load F >
1the damage of Shi Keneng to upper strain beam (22).
Load F continues to increase, at F
1∠ F ∠ F
2time, load F directly passes to wheel hub (23) by load pressure head (1), then is applied on chassis (3) through lower strain beam (25), lower wheel rim (24).Because load is increased to F from zero
2time, lower strain beam (25) deforms all the time.Sticking on the measuring bridge that the resistance strain gage (6) on lower strain beam (25) forms also has output all the time, load O-F just can be detected
2.Range change gap δ
2to prevent that load F is greater than F
2time, may lower strain beam (25) be caused damage or be destroyed.As F>=F
2time, δ
2closure is zero.
Work as F
2∠ F≤F
3time, load F directly passes to wheel hub (23) by load pressure head (1) and is applied on chassis (3), wheel hub (23) also produces compression deformation all the time, and sticking on the measuring bridge that the resistance strain gage (8) on wheel hub (23) forms also has output all the time, load O-F just can be detected
3.In general, column type elastomer load-bearing capacity is very large.Therefore, three ranges of multi-range load cell can be in very large measurement range arrangement ratio arbitrarily, to complete the high precision force measurement of multiple particular/special requirement.
Embodiment bis-:
Fig. 9 is a kind of structural representation of three range force detecting sensors.Its structure and operating principle are substantially identical with embodiment mono-, difference be the 3rd strain regions be a tube-shaped column body (26).Tube-shaped column body bending resistance is strong, lightweight, and therefore this structure is conducive to measure in the horizontal direction thrust.
Same Fig. 8 of the explanation of other labels in figure.
Embodiment tri-:
Figure 10 is a kind of structural representation of four quantum force cell.This sensor is made up of load pressure head (1), composite elastic body (2), top bottom-disc (3) and low bottom-disc (4).Its composite elastic body by be above a spoke shape body and be below two at grade, the spoke shape body of concentric, physical dimension is unequal, and respectively there are four strain beams (spoke), two groups of strain beams (25), (29) circumferencial direction one by one corresponding, differ 45 degree, be uniformly distributed.Between upper lower spokes shape body, be connected to become a whole with right cylinder (being wheel hub (23)).Structure between structure formation, lower inner rim (24) and top bottom-disc (3) between upper wheel rim (21) and load pressure head (1) forms, change gap δ
1and δ
2formation and operating principle all identical with the present embodiment one.In addition, plane (401) rigid attachment on the annulus of the lower circular planes of lower outer rim (28) and low bottom-disc (4) outer ring, makes the lower plane (302) of top bottom-disc (3) and the concave surface (402) of low bottom-disc (4) form range change gap δ
3.This force cell has four strain regions, forms measuring bridge group by the resistance strain gage (5), (6), (7), (8) that stick on the each corresponding site in strain regions.Each measuring bridge can independently be exported.
The course of action of four quantum force cell is as follows: F
1and F
2measurement identical with embodiment mono-.When continuing to increase, load F exceedes F
2time, the outer ring strain beam (29) of composite elastic body continues distortion.When increasing, F meets or exceeds F
3time, δ
3closure is zero.Load F continues to increase until ratings F again
4this process, there is all the time compression deformation in the right cylinder (23) in the middle of composite elastic body.Stick on the measuring bridge that resistance strain gage (5), (6), (7), (8) of each strain regions form and load: O-F detected respectively
1; O-F
2; O-F
3; O-F
4.
The output characteristic curve of this four quantum force cell is shown in Fig. 6 (b), and test macro can be consulted Fig. 7.
Embodiment tetra-:
Obviously,, as long as get through structural local house, just can be used as dual-range force detecting sensor and use.
For example: Figure 11 is the schematic diagram of a kind of double-range (four output) force cell, and it has just shortened the cylinder part in the middle of composite elastic body, and in the middle of making, cylinder only plays connection function.As described in embodiment mono-, it can complete load O～F
1and O～F
2measure.
Same Fig. 8 of explanation of label in figure.
Claims (3)
1. each range all has list or dual output, by load pressure head (1), for the elastic body (2) that is pasted with resistance strain gage on measuring strain regions, chassis (3) rigid attachment, utilize gap to complete the multi-range load cell of range conversion, it is characterized in that this elastic body is a spoke shape body by upper and lower two different geometrical size, and the strain beam (22) above it, (25) cross dimensions is unequal, the middle one-piece construction coupling together along three's axial line with cylinder (being wheel hub (23)), it is the composite elastic body of the I-shaped integrative-structure of radial.On this composite elastic body, there is the strain regions of three different-stiffness.Between the upper surface (201) of wheel hub (23) and the lower plane of load pressure head (1), and form multiple range change gap δ between the lower surface (202) of wheel hub (23) and chassis (3)
1, δ
2.
2. according to the force cell of claim 1, it is characterized in that wheel hub (23) is hollow cylinder.
3. according to the force cell of claim 1, the lower spokes that it is characterized in that described composite elastic body by two at grade, the spoke shape body of concentric forms, on each spoke shape body, respectively there is one group of strain beam, and two groups of strain beams (25), (29) physical dimension are unequal, circumferencial direction one by one corresponding, differ 45 degree, be uniformly distributed.The chassis of force cell is made up of top bottom-disc (3) and low bottom-disc (4) two parts, the lower circular planes rigid attachment of the upper plane of top bottom-disc (3) and lower inner rim (24), forms range change gap δ between the lower surface of wheel hub (23) and the upper plane of top bottom-disc (3)
2.In addition, circular planes (401) rigid attachment of the lower circular planes of lower outer rim (28) and low bottom-disc (4) outer ring, makes to form range change gap δ between the lower plane (302) of top bottom-disc and the concave surface (402) of low bottom-disc (4)
3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85104807 CN85104807B (en) | 1985-06-02 | 1985-06-02 | Multi-range load cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85104807 CN85104807B (en) | 1985-06-02 | 1985-06-02 | Multi-range load cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85104807B true CN85104807B (en) | 1986-08-06 |
| CN85104807A CN85104807A (en) | 1986-08-06 |
Family
ID=4794075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85104807 Expired CN85104807B (en) | 1985-06-02 | 1985-06-02 | Multi-range load cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85104807B (en) |
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| Publication number | Publication date |
|---|---|
| CN85104807A (en) | 1986-08-06 |
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