CN1010430B - Load measurement - Google Patents
Load measurementInfo
- Publication number
- CN1010430B CN1010430B CN 85105681 CN85105681A CN1010430B CN 1010430 B CN1010430 B CN 1010430B CN 85105681 CN85105681 CN 85105681 CN 85105681 A CN85105681 A CN 85105681A CN 1010430 B CN1010430 B CN 1010430B
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- CN
- China
- Prior art keywords
- load
- bar
- measuring device
- transfer device
- pin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The present invention relates to a load measurement device, wherein force or the sum of all force is exerted on a rod, and values of the force are obtained by the strain among supporting points (31) in a measuring rod. In order to reduce the influence of installation errors and the additional bending force to the minimum, the force is exerted on the rod by devices (30), (31) and (38) with elastic materials (32) and (36).
Description
The present invention relates to the device of ergometry, be specially adapted to weighing device.Though the present invention mainly is for the big and unmanageable load of weighing (as livestock and big industrial load), also can be applied to other field, really, a feature of the present invention can be applied to various load measurements exactly.
The present invention be more particularly directed to the bendable rod application of force with technology by employing strain gauge means dynamometry.
No. 2899191 patent disclosures of the U.S. a kind of weigh scale, wherein, weighing platform is bearing on a pair of bar.Bar is bearing in the knife edge bearing near its outer rim, and on bar, axle journal comprises the pin that is installed on the flange to platform by journal rest, and from knife edge bearing, pin inwardly constitutes equidistantly.Strainmeter is installed in each bar center.
In principle, the moment of flexure that the superiority of said structure layout is the bar center is directly proportional with the summation of power on being applied to journal pin, makes that the strain by measuring each bar center goes out gross load on the platform with regard to energy measurement.
The sort of topology layout as describing in the United States Patent (USP) of enjoying special application has now found that to have major defect.Its defective is support pattern and to the mode of the imposed load of bar that strainmeter is installed.Like this, for example produce any alignment error at area supported, inclination or injustice will be transformed into torsion or moment of flexure to bar, so that produce great measuring error.
Disclose similar force application structure of another kind of use and strainmeter to solve the method that gross load is measured in No. 4287958, US Patent specification, in the case, structure is got the vehicle suspension bracket shape of measuring load.In this instructions, the axle journal of bearing load is positioned at can make that its axis and bar axle intersect local and is enclosed within on the minor axis by the elasticity measurement axle sleeve and constitutes, and the both sides from bar extend out on each imposed load point.When axle journal was positioned at the outside of bar, this structure just was easy to produce torsion, and torsion can influence accurate measurement.And the mounting means of the rod end described in the disclosure all helps torsion and additional bending moment are delivered on the bar no matter produce alignment error where.
PCT applies for disclosing in WO-85-1796 number the bent stick device of the another kind of employing edge of a knife, be to select the edge of a knife degree of depth in this device according to the neutral plane of bar, and allow one to execute the lotus edge of a knife and one the supporting edge of a knife and do low friction and vertically move about, but this structure still can produce unacceptable measuring error because of the influence of distortion power or other asymmetric force.
Though prior art device discussed above has touched the load measurement problem, and has a perfect mathematics basis, and this mathematics is according to being used in the preferred embodiment of the invention, but the solution that realizes the prior art device will relate to such structure, and promptly Zhuan Zhi alignment error can produce very big measuring error.Like this, as discussed above in the United States Patent (USP) disclosed structure can in the above described manner load is applied to that place on the bar produces twisting force or produces torsion or imposed load in the place of bar supporting inaccurate and then cause sizable measuring error.
The means of prior art are emphasized the physical dimension that holding device should have, this physical dimension in the running of determining device on the mathematics as the distance between the point of force application, basic point of the present invention then is a kind of like this understanding, promptly when adopting the extensometry method to measure load, the measuring error that the error that is produced by device alignment error or tilting load power causes can be more a lot of greatly than the error of size error or change in size generation, therefore, under actual service conditions, be that cost reduces additional strain and can produce more accurate load measurement to sacrifice dimensional accuracy.
With regard to one side, the present invention roughly belongs to load-measuring device, wherein, being applied to loading force on the bar and the strain measurement on a pair of reacting force balance and the bar carries out at selection area, loading force and reacting force are applied to respectively on separately the power holder, and power holder spaced-apart certain distance on the longitudinally of bar, it is characterized in that the web member between bar and at least one the above-mentioned power holder comprises an elastic body, wherein at least a portion can play from the power holder that links to each other the effect that power is delivered on the bar, and is positioned at the horizontal boundary of bar.
Generally, four point of applications are set on the bar, two are used to apply load to be measured, and in addition two are used for cramp bar, and but, we will describe the situation of three point of applications.
In one embodiment of the invention, elastic body comprises that the lining of a deflection and each load holder all comprise a pin in lining.
Among second embodiment of the present invention, elastic body comprises the flexible component between bar and each load holder.
In the above two kinds of cases, be used in if desired bar is transmitted other purposes beyond the power, elastic body is the horizontal boundary of extended bar all, but be used on the elastic body should be at the horizontal boundary of bar to the part of the bar application of force.In running through this specification, " horizontal boundary " of bar be meant to extend to and be parallel to its longitudinal axis and the plane on the general direction of load and reacting force outside the bar itself, like this, and in certain embodiments, elastic component is not in bar, but in according to the horizontal boundary that as above definition is extended.
Fig. 1 is a force diagram;
Fig. 2 is a load measurement bar view according to the first embodiment of the invention body plan;
Fig. 3 is the planimetric map of Fig. 2 king-rod;
Fig. 4 is along the cross-sectional view of 4-4 line among Fig. 3;
Fig. 5 is the planimetric map of employing according to the weighing platform device of the bar of Fig. 2 to Fig. 4 body plan;
Fig. 6 is the side view of weighing platform device among Fig. 5;
Fig. 7 is along the partial cross section figure of 7-7 line among Fig. 5;
Fig. 8 is along the partial cross section figure of 8-8 line among Fig. 5;
Fig. 9 is the planimetric map according to the load measurement bar of second embodiment of the invention body plan;
Figure 10 is the side view of Fig. 9 king-rod;
Figure 11 is the amplification cross-sectional view that is applicable to the load holder among Fig. 9 and Figure 10 embodiment;
Figure 12 is the end-view that bar shown in Fig. 9 and Figure 10 is loaded onto the female part of transmission and bearing load;
Figure 13 is the side view according to the bar of third embodiment of the invention;
Figure 14 is the planimetric map of Figure 13 king-rod;
Figure 15 is the side view according to the bar of fourth embodiment of the invention;
Figure 16 is the planimetric map of Figure 15 king-rod;
Figure 17 is the side view according to the bar of fifth embodiment of the invention.
Having shown the bar 20 by certain material system in the force diagram of Fig. 1, is linear relationship between the moment of flexure of this material and the strain, applies a pair of power F on bar
1And F
2, they and reacting force F
3And F
4Keep balance, above-mentioned all power to put on respectively on A, E, B, the D at 4.Show easily bar 20 with power F
3And F
4Strain and F that equidistant c point produces
1X
1Product and F
2X
2The sum of products be directly proportional, wherein, X
1And X
2Be respectively F
1And F
3Do between the active line and F
2And F
4Distance between the active line.X under special circumstances
1Equal X
2, at this moment as seen, power F has been represented in the strain that c is ordered
1With F
2Sum is if the acting force that applies is F
3And F
4Then the strain of c point will be represented power F
3With F
4Sum also can be measured with strainmeter at the C point.
Fig. 2 has represented the concrete structure of schematic structure shown in Figure 1 to Fig. 8.Fig. 2 shown to Fig. 4 the strain gauge means that strainmeter 33(or other are suitable for is housed therein) rectangular shaft 20.The two pairs of pins 30 and 31 are by below being installed in the pliability lining of discussing in the hole of bar 20, and pin 30 and 31 preferably is positioned on bar 20 central shafts, and in this case, the upper and lower surface of the position of pin and bar is equidistant.If the geometric configuration of bar is more complicated, preferably determine central plane, pin 30 and 31 is positioned at wherein or approaches this plane.
Each pin 30 of cramp bar and the distance of bearing between the pin 31 of load to be measured accurately are arranged to equidistantly, in the preferred construction design, and the mid point of strainmeter 33 distance between pin 31.
Axle sleeve can be made of polyurethane material, and its durometer level should lost between Lip river-A90～95.Though more soft harder material also can use, the size of hardness should be according to serving as that magnitude of load according to carrying out device design is decided with it.Certainly, optional being used for of alternative elasticity dynamometry material may be greater than or less than the material of describing herein to the elasticity of bar transmission power and these materials.Inelastic bearing comes in handy to some point of application, but preferably always selects for use the elasticity that can provide enough to reduce the moment of flexure that produced by the device alignment error and Stress Transfer to bar, and this uses in following situation.Promptly when seeing that the error that produced by above-mentioned stress can be greater than because when having used elastic force to bear the error of little variation generation of the influential pin distance that structure brings.
Fig. 5 to Fig. 8 has shown the weighing platform device that adopts Fig. 2 to Fig. 4 king-rod.Bar 20 is equipped with a spill upper load bearing piece 21, and this part is bearing on the pin 31, and pin penetrates in the hole of female part sidewall 22.Bar 20 cooperates supporting by pin 30 with spill lower supporting part 23 sidewalls 24.24 ones of sidewalls cut open to clearly show pin 31 among the figure.Elastic washer 34 is installed in the expose portion of pin 30 and 31, help to make bar not to be subjected to the extra-stress that produces by the part in addition that is contained on the pin or moment of flexure to reach influence on the bar, and help at axle sleeve of no use bonding or axle sleeve 32 is remained on the bar when otherwise being fixed on the bar.
Weighing platform 25 is bearing on the part 21 of two above-mentioned lever apparatus, and with known method the strainmeter 33 of each bar 20 is connected on the measurement mechanism to obtain the summation of the power on two bars 20 that is applied to.
The pin that is installed in by utilization in the polyurethane axle sleeve in the hole of bar is added to load on the bar, can find, can obtain self-collimation characteristic, whereby, if the installation of part 23 is out-of-level, then power leans on the distortion of axle sleeve to determine the center along the line that its direction is delivered to bar, and this type of installation has been made valuable contribution to this field device operating accuracy.As mentioned above, outer other suitable material of polyurethane all can be used to do axle sleeve.
The bar of weighing of Fig. 9 to Figure 12 has shown bar 20 has been supported different modes with imposed load.This method is not that pin and axle sleeve are passed bar, but load onto elastic load bearing piece 36 at each point of application, this part is represented that by the sectional view of Figure 11 it comprises the elastic body of preferably making of polyurethane material 37, utilizes insert plate 39 that a pair of threaded 38 is installed on the elastic body.Bore the hole in each load on the bar 20 and supporting power application point holding pin 38, with the identical method of aforementioned enforcement power, bar 20 mode as shown in figure 12 assembles, its up and down the pin 38 of spill 21 and 23 by separately be respectively installed to load bear with bearing support on.Best, the spacer ring 40 on the elastic body 37 usefulness pins 38 separates with bar 20.
In this case, find that again device alignment error or loading force error all by 36 acceptance of elastic load bearing piece, exist under the condition of error, adopt rigidity load to bear structure in this texture ratio prior art and can obtain bigger precision.
Load bearing piece among the above-mentioned last embodiment can with top first embodiment in combine use for the load bearing piece of pin and axle sleeve form, an example of this combination is seen Figure 13 and 14, at the center, supporting member comprises pin 31 and elastic shaft sleeve 32, and side load bearing piece 36 is pressed Figure 11 formation outside.Like this, will see that load bearing piece 36 is installed in one of the bar part that descends part 36 is positioned at more near the mid-plane of bar 20 and the place, plane of pin 31.
In order to obtain relation and the best strain value of measurement point between desirable each power that device is applied, in the place of needs, how much shapes of bar can be adjusted.For example, the xsect of the core on the bar between a pair of power of inner portion can reduce, no matter this is reacting force or loading force to power.In other embodiments of the invention, the material of the core of bar can be not used in the material of the outer part of bar, selects suitable material and layout from helping strain measurement.
Figure 15 and Figure 16 have shown a kind of version of practicality, and wherein, a center sensor bar 26 has strain sensing device 33, and it is linked on the work rod member 27, and working beam is equipped with fulcrum arrangement and load holder, as pin 30 and 31.By adopting said structure, can produce standard operation rod member 27 and size and material all the sensing rod member 26 of suitable special applications be used.
Referring to Fig. 1 and will seeing to the discussion of Fig. 1, because the device of having described to this accurately provides the summation of applied force, this device just can be measured one of them power when other power are zero, the feasible load that can only measure the single point of application in the place of needs, can use with aforementioned the same measurement device, if necessary, unnecessary pin and bearing arrangement can remove.The device that this class is adjusted as shown in figure 17.
Figure 17 king-rod 20 is by the supporting of the device as shown in Fig. 7 and 8, and testing force can be applied on the part 36 by any adaptive device.Certainly, part 36 can be replaced with aforesaid that class pin 30, sells 31 all available elastic components 36 in both cases and replaces.
It should be noted, in illustrated embodiment, only adopted a strain measurement position 33, this point be positioned at bar 20 above.Yet, can adopt a pair of device, one at the bar upper surface, the lower surface at bar, have now found that the cost that adopts single measuring position can obtain satisfied result and can avoid bringing unnecessary complicacy and the circuit increase is provided for the bar both sides.
Simultaneously under normal conditions, in above-mentioned embodiment, strain gauge means can be made up of the strainmeter of common model, should understand, the device of strain is not an essential feature of the present invention in the sounding rod, can adopt other strain measurement techniques yet.
In different embodiments of the invention described herein, the material that is used as bar or bar assembly should have suitable physical property and show between moment of flexure and strain the material of satisfied linear relationship from those to be chosen.Optional usefulness has the thermal treatment steel of satisfied character.
Claims (28)
1, load-measuring device, therein with the load of balance and reacting force apply on the bar these power be added in respectively bar vertically on have mutually on the load transfer device of spacing, measure strain in the selection area on bar, this strain is because of described power rod bending to be produced, and and this selection area and load transfer device between distance, and the distance between those load transfer devices is directly proportional, it is characterized in that at least one comprises an elastic body in this load transfer device, this elastic body has at least a part to be in substantially in the horizontal boundary of bar, plays a part to transmit power to bar.
2,, be characterized as each loading force transfer device and comprise a this elastic body as the load-measuring device in the claim 1.
3,, be characterized as each reacting force transfer device and comprise a this elastic body as the load-measuring device in the claim 1.
4,, be characterized as this elastic body or at least one this elastic body and comprise the resilient material sleeve that is installed in this bar as the load-measuring device in the claim 1.
5, as the load-measuring device in the claim 4, be characterized as stressing device and be associated with this load transfer device, the stressing device that is associated with this sleeve is mounted in a rigid material pin in this sleeve.
6,, be characterized as this elastic body or at least one this elastic body and comprise an elastic materials that is placed between bar and the loading force holder as the load-measuring device in the claim 1.
7, as the load-measuring device in the claim 3, be characterized as the stressing device that is associated with this load transfer device, each described reacting force holder comprises with the resilient material sleeve and is installed in pin in the bar that the resilient material sleeve constitutes this elastic body.
8,, be characterized as the bar fulcrum arrangement, outside the pin lateral extensometer rod of each reacting force holder, to engage with this fulcrum arrangement as the load-measuring device in the claim 7.
9, as the load-measuring device in the claim 8, being characterized as this fulcrum arrangement has a channel, stretches on the length of bar substantially, have one at the bottom of and two vertical edges, described pin is supported with this vertical edge.
10,, two loading force transfer devices have been characterized as the load-measuring device in the claim 1.
11, as the load-measuring device in the claim 10, be characterized as each loading force transfer device and comprise a resilient material sleeve, each loading force holder comprises the pin that is installed in this sleeve.
12, as the load-measuring device in the claim 11, be characterized as load transfer means, described pin crosses out on bar, to engage with this transfer device.
13, as the load-measuring device in the claim 12, be characterized as this transfer device and comprise a channel, on whole length of bar, stretch substantially, groove web and dual-side are arranged, described pin and this side engage, and therefore make the load on this transfer device go up transmission to this pin.
14, as the load-measuring device in the claim 7, be characterized as each loading force transfer device and comprise a resilient material sleeve, each loading force holder comprises a pin that is fitted together with this sleeve.
15, as the load-measuring device in the claim 10, this load transfer means respectively comprises an elastic materials between this bar and loading force holder.
16,, be characterized as this load holder and be included in the load transfer means that this bar is vertically gone up stretching, extension as the load-measuring device in the claim 15.
17, as the load-measuring device in the claim 16, be characterized as this load transfer means and comprise the groove that on whole length of bar, stretches basically, trough floor and two sides that stretch to this bar portion from trough floor are arranged.
18, as the load-measuring device in the claim 7, be characterized as and further comprise two loading force holders, each this loading force transfer device has an elastic materials that is located between bar and the loading force holder.
19, as the load-measuring device in the claim 1, be characterized as each this reacting force transfer device and comprise an elastic materials, be placed between bar and the loading force holder.
20, as the load-measuring device in the claim 11, being characterized as each this reacting force transfer device has an elastic materials that is located between bar and the loading force holder.
21, as the load-measuring device in the claim 15, being characterized as each this reacting force transfer device has an elastic materials that is located between bar and the loading force holder.
22, as the load-measuring device in the claim 1, be characterized as single load transfer means, there is an elastic materials to be placed between bar and the loading force holder.
23, as the load-measuring device in the claim 22, be characterized as each reacting force transfer device and comprise such elastic body, this device also has the power holder that links with this force transfering device, each this reacting force holder comprises with the resilient material sleeve and is installed in pin in the bar that the resilient material sleeve constitutes this elastic body.
24, as the load-measuring device in the claim 22, be characterized as each this reacting force transfer device and comprise an elastic materials, be placed between bar and the loading force holder.
25, as the load-measuring device in the claim 5, be characterized as single loading force transfer device, comprise the sleeve of a resilient material.
26, as the load-measuring device in the claim 25, be characterised in that to each reacting force transfer device and comprise such elastic body, this device also has the power holder that links with this force transfering device, each this reacting force holder comprises with the resilient material sleeve and is installed in pin in the bar that the resilient material sleeve constitutes this elastic body.
27,, be characterized as each this reacting force transfer device and comprise the elastic materials that is placed between bar and the loading force holder as the load-measuring device in the claim 26.
28, as the load-measuring device in the claim 1, being characterized as this bar has one first bar portion, and this selection area is wherein arranged, this first and its fixing second portion and third part between, lay this load transfer device above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85105681 CN1010430B (en) | 1985-07-26 | 1985-07-26 | Load measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85105681 CN1010430B (en) | 1985-07-26 | 1985-07-26 | Load measurement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85105681A CN85105681A (en) | 1987-01-28 |
| CN1010430B true CN1010430B (en) | 1990-11-14 |
Family
ID=4794633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85105681 Expired CN1010430B (en) | 1985-07-26 | 1985-07-26 | Load measurement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1010430B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105318944B (en) * | 2015-11-03 | 2018-06-29 | 浙江大学 | The chicken scene weighing system and method for rod-shaped platform |
| TW201723448A (en) * | 2015-12-23 | 2017-07-01 | Prodrives & Motions Co Ltd | Axial rotation torque sensor allows one end of the elastic piece to sensitively produce bending and deformation under state of force received |
| CN111537331B (en) * | 2020-04-30 | 2023-02-10 | 中国飞机强度研究所 | Mechanical connection structure load transfer device and test method |
-
1985
- 1985-07-26 CN CN 85105681 patent/CN1010430B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85105681A (en) | 1987-01-28 |
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