CN110657874A - Infinite rigidity weighing platform - Google Patents
Infinite rigidity weighing platform Download PDFInfo
- Publication number
- CN110657874A CN110657874A CN201810695372.9A CN201810695372A CN110657874A CN 110657874 A CN110657874 A CN 110657874A CN 201810695372 A CN201810695372 A CN 201810695372A CN 110657874 A CN110657874 A CN 110657874A
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- platform
- weighing platform
- sensor
- weighing
- scale
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- 238000005303 weighing Methods 0.000 title claims abstract description 123
- 238000005452 bending Methods 0.000 claims description 30
- 230000003014 reinforcing effect Effects 0.000 claims description 10
- 239000003351 stiffener Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
- G01G21/22—Weigh pans or other weighing receptacles; Weighing platforms
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Force In General (AREA)
Abstract
The invention provides an infinite rigidity weighing platform which comprises an upper weighing platform, a lower weighing platform and a plurality of weighing feet, wherein a plurality of convex parts are arranged on the upper end surface of the lower weighing platform, and the upper weighing platform is arranged on the convex parts, so that the upper weighing platform can freely slide relative to the convex parts; a plurality of sensors are installed on the bottom surface of the lower weighing platform, the weighing feet are installed at the bottoms of the sensors correspondingly, and the protruding portions correspond to and are coaxial with the weighing feet one to one. The infinite rigidity weighing platform of the invention can ensure that the sensor can not be inclined along with the deformation of the weighing platform when bearing load by changing the structure of the weighing platform under the condition of not changing the height of the weighing platform and not increasing the weight of the whole scale, thereby improving the performance of the whole scale. Because the rigidity of the upper weighing platform and the lower weighing platform is lower, the material can be effectively saved, and the cost is reduced. Meanwhile, because the sensor can not incline when loading, the contact point between the scale foot and the sensor is stable. Therefore, the performances of repeatability, zero return, linearity, hysteresis and the like of the whole scale are greatly improved.
Description
Technical Field
The invention relates to a platform scale, in particular to an infinite rigidity weighing platform which is suitable for an electronic platform scale adopting a strain type weighing sensor.
Background
In the prior art, a platform scale is structured such that strain-type weighing sensors (hereinafter, referred to as sensors) are installed at four corners of a rectangular steel structure, and the sensors are supported on the ground through scale feet or a grounded bottom frame.
The scale body of platform balance all is thinner, so rigidity is limited, produces down warping after the loading easily and warp, and the sensor on the four corners also can take place the slope thereupon, leads to the contact point of balance foot and sensor to take place the skew. Platform scales mainly use bending beam and shear beam strain gauge sensors, which are sensitive to the load point. Therefore, the down-warping deformation of the weighing platform will cause the deterioration and even the exceeding of a series of performance indexes such as repeatability, linearity, zero return, lag and the like of the whole scale.
Based on the above situation, if the performance of the platform scale is to be improved, a weighing platform with large rigidity is required. Because the height of the current standard platform scale is fixed, the main method for improving the rigidity is to increase the number of steel beams. However, this method is still feasible for small-size and small-capacity platform scales, but tends to result in a large increase in cost for large-size and large-capacity platform scales. Meanwhile, the increase of the tare weight of the weighing platform also puts forward higher requirements for the weighing sensor.
In addition, another measure for improving the precision of the platform scale is to improve the scale feet. However, such a scale foot has a relatively complex structure and a relatively high cost, and also has a limited contribution to improving the accuracy of the whole scale.
In view of the above, there is a need for developing and improving the structure of platform balance in order to solve the above problems.
Disclosure of Invention
The invention aims to overcome the defects that a platform scale in the prior art is limited in rigidity, a sensor is easy to incline, a stress point is easy to shift and the like, and provides a platform with infinite rigidity.
The invention solves the technical problems through the following technical scheme:
an infinite rigidity weighing platform is characterized by comprising an upper weighing platform, a lower weighing platform and a plurality of weighing feet, wherein a plurality of protruding parts are arranged on the upper end surface of the lower weighing platform, and the upper weighing platform is arranged on the protruding parts, so that the upper weighing platform can freely slide relative to the protruding parts;
a plurality of sensors are installed on the bottom surface of the lower weighing platform, the weighing feet are installed at the bottoms of the sensors correspondingly, and the protruding portions correspond to and are coaxial with the weighing feet one to one.
According to one embodiment of the invention, the downward load borne on the boss is not on the same axis with the upward supporting force of the sensor, and a first bending moment is generated; the scale feet generate a second bending moment opposite to the first bending moment, and the first bending moment and the second bending moment are balanced with each other.
According to an embodiment of the present invention, the tip end surface of the projection is a circular arc surface.
According to one embodiment of the invention, a groove is formed in the bottom surface of the sensor, and one end of the scale foot is fixed in the groove.
According to one embodiment of the invention, the lower scale platform and the sensor are nested within the upper scale platform.
According to one embodiment of the invention, the upper weighing platform comprises an upper weighing platform surface and a plurality of upper weighing platform reinforcing ribs, the lower weighing platform comprises a plurality of lower weighing platform transverse connecting strips, and two ends of each lower weighing platform transverse connecting strip are fixedly connected with a sensor bottom plate to form a frame structure; the lower weighing platform transverse connecting strip is positioned at the bottom of the upper weighing platform, and the upper weighing platform reinforcing rib covers the corresponding lower weighing platform transverse connecting strip and is welded and fixed to the bottom of the upper weighing platform;
the bellying sets up the up end of sensor bottom plate, the sensor is installed the bottom of sensor bottom plate, the balance foot is installed the bottom of sensor, the underframe is established the below of balance foot is used for fixing each decides the interval between the balance foot. According to one embodiment of the invention, the protruding part is a force transfer convex point, and one end of the force transfer convex point is embedded in the sensor bottom plate.
According to one embodiment of the invention, the lower weighing platform transverse connecting strip is provided with a positioning hole, the lower surface of the upper weighing platform is provided with a positioning pin, and the lower weighing platform transverse connecting strip and the top surface of the upper weighing platform are in spaced limit connection through the positioning hole and the positioning pin of the upper weighing platform.
According to one embodiment of the invention, a side stiffener is welded to the bottom of the sensor backplane.
The positive progress effects of the invention are as follows:
the infinite rigidity weighing platform of the invention can ensure that the sensor can not be inclined along with the deformation of the weighing platform when bearing load by changing the structure of the weighing platform under the condition of not changing the height of the weighing platform and not increasing the weight of the whole scale, thereby improving the performance of the whole scale. Because the rigidity of the upper weighing platform and the lower weighing platform is lower, the material can be effectively saved, and the cost is reduced. Meanwhile, the sensor cannot be inclined during loading, so that the scale foot contact point is stable, and the impact load is well buffered. Therefore, the performances of repeatability, zero return, linearity, hysteresis and the like of the whole scale are greatly improved.
Drawings
The above and other features, nature, and advantages of the present invention will become more apparent from the following description of the embodiments when taken in conjunction with the accompanying drawings in which like reference characters identify correspondingly throughout and wherein:
fig. 1 is a schematic structural diagram of an infinite stiffness platform according to a first embodiment of the present invention.
FIG. 2 is a schematic diagram of the force between the sensor and the lower platform in the infinite stiffness platform of the present invention.
Fig. 3 is a schematic structural diagram of a second embodiment of the infinite stiffness platform of the present invention.
Fig. 4 is an enlarged view of a portion a in fig. 3.
Fig. 5 is a schematic diagram of the internal structure of a second embodiment of the infinite stiffness platform of the present invention.
Fig. 6 is a schematic view of a portion of fig. 5 taken along line B-B.
Fig. 7 is a schematic structural view of the connection between the lower scale platform cross connecting strip and the sensor base plate in the second embodiment of the infinite stiffness scale platform of the present invention.
[ reference numerals ]
First bending moment M1
Second bending moment M2
Groove 221
Reinforcing rib 12 for upper weighing platform
Lower weighing platform cross connecting strip 24
Upper weighing platform positioning pin 231
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
Further, although the terms used in the present invention are selected from publicly known and used terms, some of the terms mentioned in the description of the present invention may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein.
Furthermore, it is required that the present invention is understood, not simply by the actual terms used but by the meaning of each term lying within.
The first embodiment is as follows:
fig. 1 is a schematic structural diagram of an infinite stiffness platform according to a first embodiment of the present invention. FIG. 2 is a schematic diagram of the force between the sensor and the lower platform in the infinite stiffness platform of the present invention.
As shown in fig. 1 and 2, the present invention discloses an infinite stiffness weighing platform, which includes an upper weighing platform 10, a lower weighing platform 20 and a plurality of weighing feet 30, wherein a plurality of protrusions 21 are disposed on an upper end surface of the lower weighing platform 20, and the upper weighing platform 10 is mounted on the protrusions 21, such that the upper weighing platform 10 freely slides relative to the protrusions 21. A plurality of sensors 22 are mounted on the bottom surface of the lower platform 20, the feet 30 are mounted on the bottom of the corresponding sensors 22, and the bosses 21 are coaxial with the feet 30 in a one-to-one correspondence.
The downward load on the boss 21 and the upward supporting force of the sensor 22 are not on the same axis, and a first bending moment M1 is generated, and the scale foot 30 generates a second bending moment M2 opposite to the first bending moment M1, wherein the first bending moment M1 and the second bending moment M2 are balanced.
Preferably, the projections 21 are symmetrically distributed along the diameter of the lower scale platform 20. The tip end surface of the boss 21 is a circular arc surface. A groove 221 is arranged on the bottom surface of the sensor 22, and one end of the scale foot 30 is fixed in the groove 221.
According to the structure, the infinite rigidity weighing platform separates the platform for mounting the sensor from the platform for bearing the weighing load, adopts a double-layer weighing platform, the upper weighing platform 10 only bears the weighing load, the lower weighing platform 20 is provided with the sensor 22, and the upper weighing platform 10 transmits the load force to the lower weighing platform 20 through the four convex parts 21. The four projections 21 are here coaxial with the scale foot 30 on the lower sensor 22, and no sensor 22 can tilt therewith under limited flexural deformation of the upper scale platform 10.
As shown in fig. 2, when the lower platform 20 is stressed, the downward load on the boss 21 and the upward supporting force from the sensor 22 are not on the same axis, and a first bending moment M1 is generated. However, the first bending moment M1 will be balanced by the second bending moment M2 from the scale foot 30. Thus, the connection in the middle of the lower platform 20 does not experience bending moments, i.e., the lower platform 20 does not deflect downward.
The first bending moment M1 causes a local bending deformation of the lower scale platform 20, and the second bending moment M2 also causes a bending deformation of the sensor 22, where both bending deformations are normal deformations. Since the sensor 22 is also mounted on the sensor base plate 23 during the performance calibration test of the sensor 22, the sensor base plate 23 is also subjected to bending deformation under the action of a load.
It is of course noted that the extent of deformation of the sensor base plate 23 has some effect on the hysteresis performance of the sensor 22, and so by adjusting the local bending stiffness of the sensor-mounting portion of the lower platform 20, the hysteresis performance of the scale can be adjusted, which is another attendant advantage of such a structural platform.
Four force transmission salient points (namely the convex parts 21) between the upper weighing platform 10 and the lower weighing platform 20 are required to be arranged on the lower weighing platform 20, because the upper weighing platform 10 can be warped downwards after being loaded, the positions of the salient points are deviated, the lower weighing platform 20 is almost not deformed, and the stability and invariability of the axis of the transmission force can be ensured.
According to the structure, compared with the prior platform scale, the upper scale platform 10 of the infinite rigidity scale platform can be smaller in rigidity, so that materials can be saved. However, if the upper scale platform 10 is deflected too far downward, the distance between the upper scale platform 10 and the lower scale platform 20 must be large, and the overall scale height will be relatively high.
As described above, the infinite stiffness platform of the present embodiment ensures that the sensor 22 does not tilt when the platform is loaded, and appears to have a scale integrity performance that is independent of the platform stiffness. It can be considered infinite stiffness.
Example two:
fig. 3 is a schematic structural diagram of a second embodiment of the infinite stiffness platform of the present invention. Fig. 4 is an enlarged view of a portion a in fig. 3. Fig. 5 is a schematic diagram of the internal structure of a second embodiment of the infinite stiffness platform of the present invention. Fig. 6 is a schematic view of a portion of fig. 5 taken along line B-B. Fig. 7 is a schematic structural view of the connection between the lower scale platform cross connecting strip and the sensor base plate in the second embodiment of the infinite stiffness scale platform of the present invention.
As shown in fig. 3 to 7, the structure of the present embodiment is substantially the same as that of the first embodiment, except that: the overall height of an infinite stiffness platform according to the embodiment is high, and the limitation of the standard platform height is difficult to meet. The present embodiment employs a nested dual scale platform configuration, i.e., the lower scale platform 20 and the sensor 22 are nested within the upper scale platform 10. Specifically, the upper scale platform 10 includes an upper scale platform surface 11 and a plurality of upper scale platform reinforcing ribs 12, the lower scale platform 20 includes a plurality of lower scale platform transverse connecting strips 24, and sensor bottom plates 23 are fixedly connected to both ends of the lower scale platform transverse connecting strips 24 to form a frame structure. The structure is that a frame is formed in advance, and four sensor bottom plates 23 are ensured to be in the same plane after welding. The lower weighing platform transverse connecting strip 24 is positioned at the bottom of the upper weighing platform surface 11, and the upper weighing platform reinforcing ribs 12 cover the corresponding lower weighing platform transverse connecting strip 24 and are welded and fixed at the bottom of the upper weighing platform surface 11. The upper platform stiffener 12 is preferably U-shaped. It will also be understood that the lower platform cross web 24 extends through the upper platform stiffener 12 at the edge of the upper platform 10 with a gap therebetween that is greater than the maximum downward deflection of the upper platform 10 when fully loaded. In the assembling process of the infinite rigidity weighing platform, before the upper weighing platform reinforcing ribs 12 around the upper weighing platform 10 are assembled and welded, the assembled lower weighing platform 20 can be embedded into the infinite rigidity weighing platform.
The bulge 21 is arranged on the upper end face of the sensor bottom plate 23, the sensor 22 is arranged at the bottom of the sensor bottom plate 23, the scale foot 30 is arranged at the bottom of the sensor 22, and finally, the components are hung on the bottom frame 25.
The raised portion 21 in this embodiment may preferably be a force-transmitting protrusion, which is fixed to the sensor base plate. Alternatively, one end of the force transfer bump may be embedded in the sensor substrate 23. The lower weighing platform transverse connecting strip 24 is provided with a positioning hole 241, the upper weighing platform table 11 is provided with an upper weighing platform positioning pin 231, and the lower weighing platform transverse connecting strip 24 is in spacing connection with the upper weighing platform table 11 through the positioning hole 241 and the upper weighing platform positioning pin 231. This prevents lateral movement between the two. The sensor 22 is fixed to the bottom of the sensor base plate 23 by mounting bolts 222.
The side reinforcing plate 232 is welded to the bottom of the sensor base plate 23, so that the bending rigidity thereof can be effectively improved. At the same time, the connecting length of the connecting strip 24 with the lower weighing platform in the height direction is provided, and the coplanar rigidity of the sensor bottom plate 23 is improved.
In summary, the infinite stiffness weighing platform of the invention can ensure that the sensor can not be inclined along with the deformation of the weighing platform when bearing load by changing the structure of the weighing platform under the conditions of not changing the height of the weighing platform and not increasing the weight of the whole weighing platform, thereby improving the performance of the whole weighing platform. Because the rigidity of the upper weighing platform and the lower weighing platform is lower, the material can be effectively saved, and the cost is reduced. Meanwhile, the sensor cannot be inclined during loading, so that the scale foot contact point is stable. Therefore, the performances of repeatability, zero return, linearity, hysteresis and the like of the whole scale are greatly improved.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (9)
1. An infinite rigidity weighing platform is characterized by comprising an upper weighing platform, a lower weighing platform and a plurality of weighing feet, wherein a plurality of protruding parts are arranged on the upper end surface of the lower weighing platform, and the upper weighing platform is arranged on the protruding parts, so that the upper weighing platform can freely slide relative to the protruding parts;
a plurality of sensors are installed on the bottom surface of the lower weighing platform, the weighing feet are installed at the bottoms of the sensors correspondingly, and the protruding portions correspond to and are coaxial with the weighing feet one to one.
2. The infinite stiffness platform of claim 1, wherein the downward load on the boss is not in-line with the upward support force of the sensor, resulting in a first bending moment; the scale feet generate a second bending moment opposite to the first bending moment, and the first bending moment and the second bending moment are balanced with each other.
3. The infinite stiffness platform of claim 2, wherein the top end surface of the boss is a circular arc.
4. The infinite stiffness platform of claim 1, wherein the bottom surface of the sensor is formed with a recess, and one end of the scale foot is secured in the recess.
5. The infinite stiffness platform of claim 1, wherein the lower platform and the sensor are nested within the upper platform.
6. The infinite stiffness platform according to claim 5, wherein the upper platform comprises an upper platform surface and a plurality of upper platform reinforcing ribs, the lower platform comprises a plurality of lower platform cross connecting strips, and the two ends of the lower platform cross connecting strips are fixedly connected with sensor bottom plates to form a frame structure; the lower weighing platform transverse connecting strip is positioned at the bottom of the upper weighing platform, and the upper weighing platform reinforcing rib covers the corresponding lower weighing platform transverse connecting strip and is welded and fixed to the bottom of the upper weighing platform;
the bellying sets up the up end of sensor bottom plate, the sensor is installed the bottom of sensor bottom plate, the balance foot is installed the bottom of sensor, the underframe is established the below of balance foot is used for fixing each decides the interval between the balance foot.
7. The infinite stiffness platform of claim 6, wherein the protrusion is a force-transmitting protrusion, one end of the force-transmitting protrusion being embedded in the sensor base plate.
8. The infinite stiffness platform according to claim 6, wherein the lower platform cross connecting strip is provided with a positioning hole, the lower surface of the upper platform is provided with a positioning pin, and the lower platform cross connecting strip and the top surface of the upper platform are in spaced limit connection through the positioning hole and the positioning pin of the upper platform.
9. The infinite stiffness platform of claim 6, wherein a side stiffener is welded to the bottom of the sensor floor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810695372.9A CN110657874B (en) | 2018-06-29 | 2018-06-29 | Infinite stiffness weighing platform |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810695372.9A CN110657874B (en) | 2018-06-29 | 2018-06-29 | Infinite stiffness weighing platform |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110657874A true CN110657874A (en) | 2020-01-07 |
| CN110657874B CN110657874B (en) | 2024-09-13 |
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| CN201810695372.9A Active CN110657874B (en) | 2018-06-29 | 2018-06-29 | Infinite stiffness weighing platform |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114012296A (en) * | 2021-11-09 | 2022-02-08 | 安庆市纵衡称重科技有限公司 | High-strength weighing platform end plate welding structure, welding device and welding method thereof |
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| CN114012296B (en) * | 2021-11-09 | 2023-05-16 | 安庆市纵衡智造科技股份有限公司 | Welding structure, welding device and welding method for end plate of high-strength weighing platform |
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| CN110657874B (en) | 2024-09-13 |
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