CN117571187A - Elastomer strain structure for load sensor - Google Patents
Elastomer strain structure for load sensor Download PDFInfo
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- CN117571187A CN117571187A CN202311515091.8A CN202311515091A CN117571187A CN 117571187 A CN117571187 A CN 117571187A CN 202311515091 A CN202311515091 A CN 202311515091A CN 117571187 A CN117571187 A CN 117571187A
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- fixing
- load sensor
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 9
- 239000000806 elastomer Substances 0.000 title claims abstract description 9
- 238000013461 design Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/16—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
- G01L5/167—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using piezoelectric means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/18—Measuring force or stress, in general using properties of piezo-resistive materials, i.e. materials of which the ohmic resistance varies according to changes in magnitude or direction of force applied to the material
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Force In General (AREA)
Abstract
The application relates to an elastomer strain gauge for a load cell comprising: the device comprises a first fixing seat, a second fixing seat and a strain column; the first fixing seat and the second fixing seat are respectively positioned at two ends of the strain column; the strain column is of an I-beam structure, the strain column comprises a web plate and two flange plates, the opposite ends of the web plate are respectively connected with the first fixing seat and the second fixing seat, and the opposite ends of the flange plates are respectively connected with the first fixing seat and the second fixing seat. The strain column is designed into the I-beam structure, the eccentric load resistance of the strain column is greatly improved, the local deformation generated in the area where the upper end face is subjected to the concentrated force acts is restrained, because the unbalanced stress is redistributed due to the characteristics of the I-beam structure, the web can generate quite large tensile force and prevent the deflection from increasing, the stress of the strain column is more reasonable and balanced, and the unbalanced load resistance of the designed load sensor is improved.
Description
Technical Field
The application relates to the technical field of load sensors, in particular to an elastomer strain structure for a load sensor.
Background
The column type sensor is a measuring element, and in the measuring process, pressure acts on an elastic body to generate deformation, and the strain (positive or negative) is converted into an electronic signal by a strain gauge attached to the elastic body, so that the measurement of the called bearing load is realized.
However, the elastic strain area of the existing column type sensor is a column structure with a rectangular cross section, and the structure has good axial rigidity, but poor radial rigidity, so that the offset load resistance of the column type sensor is poor. Secondly, the existing I-beam type sensor adopts a single column body as a support, so that reference can not be provided for a design method of the three-component force sensor, and secondly, the lateral measuring range can not be improved.
Therefore, how to improve the unbalanced load resistance of the column sensor is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of this, the present application proposes an elastomeric strain structure for a load cell.
According to an aspect of the present application, there is provided an elastomer strain structure for a load sensor, suitable for design and processing of a wide-range, three-component load sensor, elastically deformed by pressure, comprising: the device comprises a first fixing seat, a second fixing seat and a strain column;
the first fixing seat and the second fixing seat are respectively positioned at two ends of the strain column;
the strain column is of an I-beam structure and comprises a web plate and two flange plates, wherein the opposite ends of the web plate are respectively connected with the first fixing seat and the second fixing seat, and the opposite ends of the flange plates are respectively connected with the first fixing seat and the second fixing seat.
In one possible implementation, the strain columns are two or more, and the two or more strain columns are arranged in a quadrilateral manner.
In one possible implementation manner, the first fixing seat is provided with a first connecting part and a first fixing part, and the second fixing seat is provided with a second connecting part and a second fixing part;
the first connecting part and the second connecting part are respectively connected with two ends of the strain column;
the first fixing part and the strain column are respectively positioned at two opposite sides of the first connecting part;
the second fixing portion and the strain column are respectively located at two opposite sides of the second connecting portion.
In one possible implementation manner, the first connecting portion and the second connecting portion are both in cylindrical structures, and two ends of the strain column are respectively connected with the end face of the first connecting portion and the end face of the second connecting portion;
the first fixing portion and the second fixing portion are both rectangular structures, the first connecting portion is located at one side middle portion of the first fixing portion, and the second connecting portion is located at one side middle portion of the second fixing portion.
In one possible implementation, the first fixing portion and the second fixing portion are each provided with two or more mounting holes.
In one possible implementation manner, the number of the strain posts is four, the four strain posts are arranged in an equilateral rectangle, and the four strain posts are respectively positioned at four corners of the equilateral rectangle.
In one possible implementation, four of the strain posts are respectively adjacent to an end face edge of the first connection portion.
In one possible implementation manner, the main body of the strain column is in a columnar structure, and buffer grooves are respectively formed in two opposite side surfaces of the strain column.
In one possible implementation manner, the main body of the strain column is in a rectangular column structure, two buffer grooves formed on two opposite sides of the strain column are all in a slotted hole structure, and the length direction of the buffer grooves is the same as the axis direction of the strain column.
In one possible implementation, the webs of more than two of the strain posts are disposed parallel to each other.
The design and the processing of this application suitable for wide-range, three-component load sensor, first fixing base and second fixing base are connected with the equipment that awaits measuring respectively for bear the pressure that awaits measuring, strain column receives the pressure action and takes place elastic deformation. Compared with a traditional strain column with a rectangular column structure and a rectangular cross section, the strain column is designed into an I-beam structure, the eccentric load resistance of the strain column is greatly improved, the local deformation generated in the area where the upper end face is subjected to the concentrated force acts is restrained, because of the characteristics of the I-beam structure, unbalanced stress is redistributed, a web can generate considerable tensile force and delay the development of deflection, the whole stress of the strain column is more reasonable and balanced, and the unbalanced load resistance of an adaptive sensor is improved.
Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features and aspects of the present application and together with the description, serve to explain the principles of the present application.
FIG. 1 shows an elastomeric strain structure design for a load cell of an embodiment of the present application;
FIG. 2 illustrates an isometric cross-sectional view of an elastomeric strain gage structure design for a load cell in accordance with an embodiment of the present application;
FIG. 3 illustrates a front view of an elastomeric strain structure design for a load cell in accordance with an embodiment of the present application;
FIG. 4 shows a cross-sectional view of an elastomeric strain gage structure design for a load cell in accordance with an embodiment of the present application;
fig. 5 shows an enlarged cross-sectional view of a strain post for an elastomeric strain gage design for a load cell in accordance with an embodiment of the present application.
Detailed Description
Fig. 1 shows a main structural view of an elastic strain structure for a load sensor according to an embodiment of the present application, and fig. 2 shows an isometric sectional view of an elastic strain structural design for a load sensor according to an embodiment of the present application. As shown in fig. 1 and 2, the elastic body strain device for a load sensor includes: the first fixing base 100, the second fixing base 200, and the strain post 300; the first fixing seat 100 and the second fixing seat 200 are respectively positioned at two ends of the strain post 300; the strain column 300 is an i-beam structure, the strain column 300 comprises a web 310 and two flange plates 320, opposite ends of the web 310 are respectively connected with the first fixing seat 100 and the second fixing seat 200, and opposite ends of the flange plates 320 are respectively connected with the first fixing seat 100 and the second fixing seat 200.
The application is applicable to design and processing of a wide-range three-component load sensor, and the first fixing seat 100 and the second fixing seat 200 are respectively connected with equipment to be tested and are used for bearing pressure to be tested, and the strain column 300 is elastically deformed under the action of pressure. Compared with the traditional strain column 300 with a cylindrical structure and a rectangular cross section, the strain column 300 is designed into an I-beam structure, the eccentric load resistance of the strain column is greatly improved, the local deformation generated in the area with the concentrated force on the upper end face is restrained, because of the characteristics of the I-beam structure, unbalanced stress is redistributed, the web 310 can generate considerable tensile force and delay the development of deflection, the whole stress of the strain column 300 is more reasonable and balanced, and the unbalanced load resistance of the adaptive sensor is improved.
Further, the strain post 300 of the i-beam structure reduces the fatigue fracture condition of the adapted sensor under special conditions, and improves the static performance of the adapted sensor.
In one possible implementation, the strain posts 300 are two or more, and the two or more strain posts 300 are circumferentially arranged. The number of the strain posts 300 can be correspondingly set according to the type of the sensor to be adapted by a person skilled in the art, so that the number of the strain posts 300 is matched with the number of strain gauges of the sensor to be adapted.
As shown in fig. 1 and 2, the first fixing base 100 is provided with a first connection portion 110 and a first fixing portion 120, and the second fixing base 200 is provided with a second connection portion 210 and a second fixing portion 220; the first connection part 110 and the second connection part 210 are connected to both ends of the strain column 300, respectively; the first fixing portion 120 and the strain column 300 are respectively located at opposite sides of the first connecting portion 110; the second fixing portion 220 and the strain post 300 are located at opposite sides of the second connection portion 210, respectively. The first fixing base 100 and the second fixing base 200 are connected with the equipment to be tested through the first fixing portion 120 and the second fixing portion 220 respectively, the whole structure is simple, and the production cost is effectively reduced.
In one possible implementation manner, the first connection portion 110 and the second connection portion 210 are both in a cylindrical structure, and two ends of the strain column 300 are respectively connected with an end surface of the first connection portion 110 and an end surface of the second connection portion 210; the first fixing portion 120 and the second fixing portion 220 are both rectangular structures, the first connecting portion 110 is located at a middle portion of one side of the first fixing portion 120, and the second connecting portion 210 is located at a middle portion of one side of the second fixing portion 220. It should be noted that, although the present application is described above by way of example, those skilled in the art will appreciate that the present application should not be limited thereto. In fact, the specific structures of the first connection portion 110, the second connection portion 210, the first fixing portion 120 and the second fixing portion 220 can be flexibly set by the user according to the range of the measured object or the installation requirement of the actual application scene, so long as the use under any complex environment can be satisfied.
Further, the first fixing portion 120 and the second fixing portion 220 are provided with two or more mounting holes. The first fixing part 120 and the second fixing part 220 are respectively mounted to the device to be tested through mounting holes thereof.
More than two mounting holes of the first fixing portion 120 are arranged around the first connecting portion 110 in a rectangular shape, and more than two mounting holes of the second fixing portion 220 are arranged around the second connecting portion 210 in a rectangular shape.
Preferably, the first fixing portion 120 and the second fixing portion 220 are each provided with twelve mounting holes.
It should be noted here that, preferably, the sensor adapted in the present application is a four-column sensor, so that the number of the strain columns 300 is four, the four strain columns 300 are arranged in a square shape, and the four strain columns 300 are respectively located at four corners of the square shape.
In one possible implementation, the four strain posts 300 are respectively close to the end edges of the first connection portion 110, so as to increase the distance between the four strain posts 300, and further increase the lateral resistance of the whole application.
Further, compared to a conventional right rectangular cross-sectional structure, the i-beam strain column 300 of the present application greatly improves the lateral resistance, torsional rigidity and shear strength. The i-beam structure cross section is more developed, the moment of inertia of the cross section is larger, and the bending resistance bearing capacity of the strain column 300 is correspondingly improved. Secondly, the pressure acting on the measuring unit is reduced, the resistance strain type material of the strain column 300 is prevented from being damaged, the working stability of the force sensor is improved, and the service life and the cycle life of the force sensor are prolonged. And finally, the I-shaped Liang Ying variable column 300 is used as a supporting structure of the three-component force sensor, even if the sensor fails and breaks in the working process, the I-shaped beam structure has stronger lateral resistance and obvious deformation before breaking, so that the I-shaped beam structure can be manually compensated and trimmed, and the situation of sudden failure of the traditional four-column structure is avoided.
Furthermore, the strain column 300 is designed into an i-beam structure, and compared with the traditional regular rectangular section structure, the three-directional measuring range ratio of the traditional three-component force sensor x:y:z is 1:1:5, the i-beam structure can respectively increase the measuring range of the lateral force of the three-component force sensor by eighty percent, and the three-directional measuring range ratio of the improved structure x:y:z is 1:1:1, so that the measuring range and the use scene are greatly improved.
In addition, the strain column 300 of the I-beam structure is sensitive to deformation sensing, particularly, the problem of mutual interference among dimensions is effectively solved for the three-component force sensor, the influence of crosstalk among mutual forces is guaranteed to be reduced to be within an error range, and the measurement accuracy of the three-component force sensor is greatly improved.
Compared with the strain column 300 of the traditional rectangular section structure, the strain column 300 of the I-beam structure not only enhances the rigidity of the sensor, but also effectively improves the sensitivity and response speed of the sensor due to the fact that the I-beam support structure is smaller than the column type rectangular section structure in total mass and inertia, and meanwhile, the dynamic response frequency of the sensor can be improved.
The general four-column type strain column 300 with the rectangular cross section structure is mostly suitable for single-component force sensors, and has the advantages of large measuring range, easy assembly, simple integrated processing, and low requirements on side output, unbalanced load resistance and eccentric resistance. However, for complex environmental scenes, such as fields of robot finger, paw research, precise assembly, cutting, intelligent automobile manufacturing, automatic assembly line assembly, aerospace and the like, firstly, great requirements are put on the installation position and the structure and weight of the sensor, and secondly, the application scenes greatly need three-component and even multi-component output force and moment. However, three-component force sensors designed at the present stage are mostly of four-column type positive rectangular sectional area structures, and when eccentric stress or torque is detected, unstable change of stress points can greatly influence output, so that the problems of low measurement precision, poor stability and the like of the three-component force sensors are caused. Particularly, the problem of larger mutual interference exists among multiple dimensions, so that the measurement error is further increased and the measurement range is shortened.
In one possible implementation, referring to fig. 5, the web 310 of the strain column 300 is provided with a thickness a, the flange plate 320 of the strain column 300 is provided with a preset thickness b, and in combination with theoretical data calculation and experimental analysis results, it is recommended that the relationship between the width and thickness ratios of the flange plate 320 is: w/b < 13, the relationship of the height to thickness ratio of the web 310 is: h/a < 80.
In one possible implementation, the body of the strain post 300 is in a cylindrical structure, and the opposite sides of the strain post 300 are respectively grooved. By forming the buffer grooves on the two opposite sides of the strain column 300, the strain column 300 forms an I-beam structure, the processing mode is simpler, and the production cost is effectively reduced.
Further, the main body of the strain column 300 is in a rectangular column structure, and two buffer grooves formed on two opposite sides of the strain column 300 are all in a oblong hole structure, and the length direction of the buffer grooves is the same as the axial direction of the strain column 300. As shown in fig. 3 and fig. 4, by forming oblong holes on two opposite side surfaces of the strain column 300, an i-beam structure is formed in the middle of the strain column 300, and two end surfaces of the strain column 300 are kept rectangular, so that the strain column 300 has the structural advantage of an i-beam, and has a larger contact area with the first connection portion 110 and the second connection portion 210, so as to have better connection stability.
It should be noted that, the main body of the strain column 300 is in a rectangular column structure, that is, the end face of the main body is square, the square end face of the main body is provided with a preset side length a, the strain column 300 is provided with a preset length B, the length C of the rectangular hole is set in the body length direction, and the main body can be set by those skilled in the art according to the actual installation environment and the working range.
Referring to fig. 2 and 4, the webs 310 of more than two strain posts 300 are disposed parallel to one another. That is, the side faces of the two or more strain posts 300 are aligned in the direction. The four strain posts 300 are arranged in a square shape, and the right angles of the end surfaces of the four strain posts 300 are respectively overlapped with the four right angles of the square shape. The four strain posts 300 are square and have a predetermined side length L.
From the perspective of improving the dynamic frequency response of the sensor, the relation between the preset length B of the strain column 300 and the preset side length L of the square of the strain column 300 is recommended to be B/L more than or equal to 2; the determination of the preset side length A of the square end face of the strain column 300 and the preset length C of the rectangular circular hole mainly depends on the actual installation size and the working range.
The embodiments of the present application have been described above, the foregoing description is exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. An elastomer strain structure for a load cell adapted for use in the design and processing of a wide-range, three-component load cell, the structure being elastically deformable under pressure, comprising: the device comprises a first fixing seat, a second fixing seat and a strain column;
the first fixing seat and the second fixing seat are respectively positioned at two ends of the strain column;
the strain column is of an I-beam structure and comprises a web plate and two flange plates, wherein the opposite ends of the web plate are respectively connected with the first fixing seat and the second fixing seat, and the opposite ends of the flange plates are respectively connected with the first fixing seat and the second fixing seat.
2. The elastic body strain structure for a load sensor according to claim 1, wherein the strain posts are two or more, and the strain posts are arranged in a quadrangular shape.
3. The elastic body strain structure for a load sensor according to claim 1, wherein the first fixing base is provided with a first connecting portion and a first fixing portion, and the second fixing base is provided with a second connecting portion and a second fixing portion;
the first connecting part and the second connecting part are respectively connected with two ends of the strain column;
the first fixing part and the strain column are respectively positioned at two opposite sides of the first connecting part;
the second fixing portion and the strain column are respectively located at two opposite sides of the second connecting portion.
4. The elastic body strain structure for a load sensor according to claim 3, wherein the first connecting portion and the second connecting portion are each of a cylindrical structure, and both ends of the strain column are connected to an end face of the first connecting portion and an end face of the second connecting portion, respectively;
the first fixing portion and the second fixing portion are both rectangular structures, the first connecting portion is located at one side middle portion of the first fixing portion, and the second connecting portion is located at one side middle portion of the second fixing portion.
5. The elastic body strain gauge structure for a load sensor of claim 4, wherein the first fixing portion and the second fixing portion are each provided with two or more mounting holes.
6. The elastic body strain structure for a load sensor according to claim 4, wherein the number of the strain posts is four, the four strain posts are arranged in an equilateral rectangle, and the four strain posts are respectively positioned at four corners of the equilateral rectangle.
7. The elastomer strain structure for a load sensor of claim 6, wherein four of the strain posts are respectively adjacent to an end surface edge of the first connection portion.
8. The elastomer strain structure for a load sensor according to any one of claims 2 to 7, wherein the main body of the strain column has a columnar structure, and buffer grooves are formed in opposite side surfaces of the strain column.
9. The elastomer strain structure for a load sensor according to claim 8, wherein the main body of the strain column has a rectangular column structure, two buffer grooves formed on opposite sides of the strain column are all of a slotted hole structure, and the body length direction of the grooves is the same as the axis direction of the strain column.
10. The elastomeric strain gage for a load cell of claim 8, wherein the webs of two or more of the strain gages are disposed parallel to one another.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311515091.8A CN117571187A (en) | 2023-11-14 | 2023-11-14 | Elastomer strain structure for load sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311515091.8A CN117571187A (en) | 2023-11-14 | 2023-11-14 | Elastomer strain structure for load sensor |
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| Publication Number | Publication Date |
|---|---|
| CN117571187A true CN117571187A (en) | 2024-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311515091.8A Pending CN117571187A (en) | 2023-11-14 | 2023-11-14 | Elastomer strain structure for load sensor |
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| Country | Link |
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| CN (1) | CN117571187A (en) |
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- 2023-11-14 CN CN202311515091.8A patent/CN117571187A/en active Pending
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