CN221571636U - Bellows type weighing sensor - Google Patents
Bellows type weighing sensor Download PDFInfo
- Publication number
- CN221571636U CN221571636U CN202323069488.7U CN202323069488U CN221571636U CN 221571636 U CN221571636 U CN 221571636U CN 202323069488 U CN202323069488 U CN 202323069488U CN 221571636 U CN221571636 U CN 221571636U
- Authority
- CN
- China
- Prior art keywords
- column
- load cell
- bellows
- deformation
- circuit board
- 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.)
- Active
Links
- 238000005303 weighing Methods 0.000 title abstract description 19
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 239000000945 filler Substances 0.000 claims abstract description 7
- 229920001971 elastomer Polymers 0.000 abstract description 4
- 239000000806 elastomer Substances 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000002184 metal Substances 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Measurement Of Force In General (AREA)
Abstract
The utility model relates to a bellows type weighing sensor, which comprises an elastomer, a signal component, a filler and a bottom sealing plate. The elastic body comprises a column body part, a connecting column and a flange part, wherein the column body part is recessed from the end face to one side of the connecting column to form a deformation cavity, and the flange part and the column body part are respectively provided with two or more upper connecting holes; the signal assembly comprises a circuit board and a strain gauge assembly, a signal wire of the strain gauge assembly is connected to the circuit board, and an output wire of the circuit board passes through the column part; filling the deformation cavity with filler and containing the circuit board; the bottom sealing plate seals the opening of the deformation cavity. The sensor has the advantages of simple structure, easy processing and manufacturing, low installation height, high measurement precision and good sensor performance.
Description
Technical Field
The utility model relates to the technical field of sensors, in particular to a bellows type weighing sensor.
Background
A load cell is a device that converts the weight of an object into an electrical signal, and is commonly used in weighing systems. The common weighing sensor is based on the principle that a thin film element with a resistance value which changes along with deformation is attached to a metal surface in a specific shape, when the metal and the thin film element are deformed under pressure, the resistance of the thin film element also changes along with the deformation, and a driving circuit converts the resistance value into a digital signal to be output, so that the deformation of the metal can be measured, and the pressure applied to the metal surface can be measured.
A weighing sensor is disclosed in chinese patent CN217211058U, for example. The common weighing sensor has more parts, more complex structure and larger volume, and cannot adapt to special working occasions, so improvement is needed.
Disclosure of utility model
In order to overcome the problems in the related art, the embodiment of the utility model provides a bellows type weighing sensor.
According to a first aspect of an embodiment of the present utility model, there is provided a bellows-type load cell, the bellows-type load cell comprising:
The elastic body comprises a column body part, a connecting column protruding from the column body part and a flange part protruding along the radial direction of the connecting column, wherein the column body part is recessed from the end face to one side of the connecting column to form a deformation cavity, the flange part is provided with two or more upper connecting holes, and the column body part is recessed from the end face to be provided with two or more lower connecting holes;
The signal assembly comprises a circuit board and a strain gauge assembly attached to the bottom of the deformation cavity, a signal wire of the strain gauge assembly is connected to the circuit board, and an output wire of the circuit board passes through the column part;
a filler filling the deformation cavity and containing the circuit board;
And the bottom sealing plate seals the opening of the deformation cavity.
In an embodiment, the column part is cylindrical, and the deformation cavity is a circular groove structure.
In an embodiment, the center of the connecting post and the center of the cylindrical portion coincide, and the strain gage assembly is distributed with respect to the center of the connecting post.
In one embodiment, a step is provided between the cylindrical portion and the flange portion.
In an embodiment, a step groove is formed at the opening of the deformation cavity, and the bottom sealing plate is limited in the step groove.
In an embodiment, the upper and lower connection holes are coaxially arranged.
In one embodiment, the flange portion has an outer diameter of 25mm to 40mm.
In one embodiment, the intersection of the cylindrical portion and the connecting post is provided with an arcuate chamfer.
In an embodiment, the thickness of the bottom wall of the deformation cavity is smaller than the thickness of the flange portion.
In an embodiment, the signal assembly includes a signal connector sleeved outside the signal line, and the signal connector is detachably connected to the connection hole of the column portion.
The technical scheme provided by the embodiment of the utility model can comprise the following beneficial effects: a step part is arranged between the column body part and the flange part of the bellows type weighing sensor, and the step part can enhance the structural strength of the joint position of the flange part and the connecting column; the intersecting part of the column body part and the connecting column of the bellows type weighing sensor is provided with an arc chamfer, so that the phenomenon of stress concentration can be reduced, and the linearity of the sensor is improved. The thickness of the bottom wall of the deformation cavity is smaller than that of the flange part, so that the deformation degree of the bottom of the deformation cavity can be amplified, and the sensitivity of the sensor is improved. In addition, the opening of cylinder portion and outside intercommunication also is sealed and is handled, can improve waterproof dirt-proof ability. In a word, the bellows type weighing sensor has a fine structure, and under the condition of smaller size, better performance is realized in the aspects of measurement precision, linearity, sensitivity and the like.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.
FIG. 1 is a cross-sectional view of a bellows load cell shown according to an exemplary embodiment.
Fig. 2 is a schematic diagram of a bellows-type load cell shown according to an exemplary embodiment.
FIG. 3 is an elastomeric side view of a bellows load cell shown according to an exemplary embodiment.
FIG. 4 is a bottom schematic view of a bellows-type load cell with a strain gage assembly in the shape of a loop, according to an exemplary embodiment.
FIG. 5 is a bottom schematic view of a bellows-type load cell showing a strain gage assembly as multiple strain gages, according to an exemplary embodiment.
In the figures, an elastomer 10; a column portion 11; a connection hole 111; a connecting column 12; a flange portion 13; a deformation chamber 14; an upper connection hole 15; a lower connection hole 16; a step 17; chamfering 18; a step groove 19; a signal assembly 20; a wiring board 21; an output line 211; a strain gauge assembly 22; a signal line 221; a signal connector 23; a filler 30; and a bottom closure plate 40.
Detailed Description
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the utility model, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that, if the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present utility model and simplifying the description, rather than indicating or implying that the apparatus or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, so that the terms describing the positional relationships in the drawings are merely for exemplary illustration and should not be construed as limiting the present patent, and that the specific meaning of the terms described above may be understood by those of ordinary skill in the art according to specific circumstances.
In the description of the present utility model, unless explicitly stated and limited otherwise, the term "coupled" or the like should be interpreted broadly, as it may be fixedly coupled, detachably coupled, or integrally formed, as indicating the relationship of components; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between the two parts or interaction relationship between the two parts. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1-5, the present utility model provides a bellows-type load cell that includes an elastomer 10, a signal assembly 20, a filler 30, and a bottom closure plate 40. The elastic body 10 comprises a cylindrical column part 11, wherein the column part 11 is provided with a connecting column 12 in an upward protruding mode, and the connecting column 12 is connected with a flange part 13 protruding in a radial direction; the bottom of the column body 11 is recessed from the end face to one side of the connecting column 12 to form a deformation cavity 14, and the deformation cavity 14 is of a circular groove structure. The cross sections of the column body 11, the connecting column 12, the flange 13 and the deformation cavity 14 are all round, and the column body, the connecting column and the flange are all on the same central axis. The elastic body 10 is rotationally symmetrical about the center of the central axis. In the present embodiment, the elastic body 10 is formed by cutting.
The strain gauge assembly 22 is attached to the bottom of the deformation cavity 14, and a signal line 221 of the strain gauge assembly 22 is connected to a circuit board 21, and the circuit board 21 and the strain gauge form a signal assembly 20. The circuit board 21 is placed inside the deformation chamber 14 without touching the peripheral wall of the deformation chamber 14 and the strain gauge assembly 22 under the inclusion of the filler 30. The side of the column part 11 is provided with an opening, and the output line 211 of the circuit board 21 passes through the opening and is led out from the side of the column part 11. The bottom of the column 11 is provided with a bottom sealing plate 40, and the bottom sealing plate 40 is used for sealing the opening of the deformation cavity 14. The outer diameter of the flange portion 13 of the elastic portion is between 25mm and 40mm, and since the sensor is small, it is easy to install and the overall height is low. The flange portion 13 outer lane evenly is provided with three upper connecting holes 15, and cylinder portion 11 is provided with three lower connecting holes 16 from the terminal surface indent. The lower connection hole 16 and the upper connection hole 15 are coaxially disposed. The upper connecting hole 15 is a through hole, and the lower connecting hole 16 is a blind hole.
The usage method and principle of the bellows type weighing sensor provided by the utility model are as follows: the lower connecting hole 16 is connected through a fastener, the bellows type weighing sensor is horizontally and stably fixed on the working platform, and the flange part 13 is in fit connection with the bearing flat plate through the upper connecting hole 15. When the measured object is placed on the weighing flat plate, the bellows type weighing sensor is subjected to vertical downward pressure, the elastic body 10 is subjected to micro deformation, the micro deformation of the elastic body 10 causes the resistance value of the strain gauge assembly 22 to change, and the circuit board 21 converts the change condition of the resistance value of the strain gauge assembly 22 into an electric signal to be output. After calibration, the corresponding relation between the deformation of the elastic body 10 caused by the weight of the object and the resistance value of the strain gauge assembly 22 can be established, and the weight value of the measured object can be obtained by reading the electric signal of the circuit board 21.
When the object to be measured is placed on the weighing plate, the vertically downward pressure is conducted to the column part 11 via the flange part 13 and the connecting column 12, and the flange part 13, the connecting column 12 and the column part 11 are subjected to pressure of uniform magnitude. When the stress analysis is performed on the connection post 12, it is known that the thinner the connection post 12 is, the greater the pressure at the connection position between the flange portion 13 and the connection post 12 is, the more easily the connection position between the flange portion 13 and the connection post 12 is deformed, and the structural stability is affected. Therefore, in order to strengthen the structural strength of the flange at the connection position with the connection post 12, a step portion 17 is provided between the cylindrical portion 11 and the flange portion 13, the step portion 17 has a disk structure concentric with the flange portion 13, and the diameter of the step portion 17 is larger than that of the connection post 12 and smaller than that of the flange. The step part 17 can conduct the stress between the flange part 13 and the connecting column 12, avoid the deformation of the joint position of the flange part 13 and the connecting column 12, and improve the bearing stability of the flange part 13.
Because the strain gage assembly 22 is attached to the bottom of the deformation chamber 14, the bellows load cell should be constructed so that deformation of the elastomer 10 occurs primarily at the bottom of the deformation chamber 14 as much as possible. This has the advantage that the more sensitive the deformation of the bottom of the deformation chamber 14 to changes in pressure, the higher the sensitivity of the sensor. The thicker the material thickness, the less deformation will occur under the same amount of pressure. In order to enlarge the degree of deformation of the bottom of the deformation chamber 14 and reduce the degree of deformation of the flange portion 13, it is preferable that the bottom wall thickness of the deformation chamber 14 is smaller than the thickness of the flange portion 13.
In addition to sensitivity, the linearity of the measured physical quantity with the output signal is also a very important performance indicator of the sensor. In order to further improve the linearity of the bellows type weighing sensor, the utility model further optimizes the following steps: the intersection of the cylindrical portion 11 and the connecting post 12 is provided with an arcuate chamfer 18. The connection post 12 is an assembly that conducts radial pressure to the column portion 11. If the column portion 11 and the connection post 12 are simply connected, the interface of the intersection of the column portion 11 and the connection post 12 will be in a perpendicular relationship, with the side of the connection post 12 being at right angles to the top surface of the column portion 11. When the connecting column 12 is radially compressed, the right angle transition of the intersection of the column portion 11 and the connecting column 12 will create a problem of stress concentration. Stress concentration not only easily causes metal fatigue at the intersection to cause fracture, but also causes deformation of the elastic body 10 due to the weight of the object, and after exceeding a specific weight, abrupt change occurs, so that the output characteristic is not linear enough. If the linearity of the sensor is not good, the measured physical quantity and the output electric signal cannot be linearly fitted. If the limited sensor works in a linear interval, the range of the limited sensor tends to be reduced; if the sensor is allowed to operate out of the linear region, a large measurement error will occur in the nonlinear interval. In the case of the bellows type weighing sensor, the arc chamfer 18 is arranged at the intersection part of the column body 11 and the connecting column 12, so that the phenomenon of stress concentration can be reduced, and the deformation amount of the bottom wall of the deformation cavity 14 caused by pressure is more linear. The weight of the measured object and the deformation amount of the bottom wall of the deformation cavity 14 are in linear relation in a larger range, namely in linear relation with the resistance value of the strain gauge, so that the sensor can obtain a stable proportionality coefficient, and the measurement accuracy of the sensor is improved.
Because deformation of the bellows type sensor occurs on the bottom wall of the deformation cavity 14, the stress applied to the bottom wall of the deformation cavity 14 and the deformation are distributed from the center to the periphery. Thus, in order to accurately measure the degree of deformation, the strain gage assemblies 22 are uniformly distributed about the central axis of the deformation body, inside the bottom wall of the deformation chamber 14. The strain gauge may be an annular strain gauge concentric with the central axis (as shown in fig. 4), or may be a plurality of strain gauges independently and uniformly distributed around the central axis (as shown in fig. 5). In this embodiment, the strain gage assembly 22 includes four evenly distributed strain gages. The circuit board 21 is connected to the strain gauge assembly 22, and is used for measuring the resistance and the variation of the strain gauge assembly 22 and outputting the measured resistance and variation in the form of an electric signal.
Considering that the bellows type sensor may work under severe working conditions, in order to improve the waterproof and dustproof capabilities of the sensor, the opening of the cylinder 11, which is communicated with the outside, is also sealed. A circle of step grooves 19 are arranged at the bottom opening of the deformation cavity 14, and the thickness of the bottom sealing plate 40 is slightly smaller than that of the step grooves 19. When the bottom sealing plate is buckled in the step groove 19, the position of the bottom sealing plate is slightly higher than the bottom of the deformation cavity 14, so that on one hand, the bottom of the elastic body 10 can be ensured to be fully contacted with the mounting platform, and on the other hand, the bottom sealing plate can be prevented from colliding with objects below to influence the sealing effect. In addition, the signal assembly 20 includes a signal connector 23 sleeved outside the signal line 221, and the signal connector 23 is preferably a waterproof and dustproof connector, such as a detachable threaded flange connector, and the signal connector 23 is connected to the connection hole 111 of the column portion 11.
Other embodiments of the utility model will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the utility model and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the utility model being indicated by the following claims.
It is to be understood that the utility model is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the utility model is limited only by the appended claims.
Claims (10)
1. A bellows load cell, the bellows load cell comprising:
The elastic body comprises a column body part, a connecting column protruding from the column body part and a flange part protruding along the radial direction of the connecting column, wherein the column body part is recessed from the end face to one side of the connecting column to form a deformation cavity, the flange part is provided with two or more upper connecting holes, and the column body part is recessed from the end face to be provided with two or more lower connecting holes;
The signal assembly comprises a circuit board and a strain gauge assembly attached to the bottom of the deformation cavity, a signal wire of the strain gauge assembly is connected to the circuit board, and an output wire of the circuit board passes through the column part;
a filler filling the deformation cavity and containing the circuit board;
And the bottom sealing plate seals the opening of the deformation cavity.
2. The bellows type load cell of claim 1 wherein said cylindrical portion is cylindrical and said deformation cavity is a circular groove structure.
3. The bellows load cell of claim 1, wherein a center of said connecting post and a center of said cylindrical portion are coincident and said strain gage assembly is distributed with respect to a center of said connecting post.
4. A bellows type load cell according to claim 3, wherein a step portion is provided between the column portion and the flange portion.
5. The bellows load cell of claim 1, wherein a stepped slot is provided at an opening of said deformation chamber, said bottom closure plate being defined within said stepped slot.
6. The bellows load cell of claim 1, wherein said upper and lower connection holes are coaxially disposed.
7. The bellows type load cell of claim 1 wherein the flange portion has an outer diameter of 25mm to 40mm.
8. The bellows load cell of claim 1, wherein an arcuate chamfer is provided at an intersection of said post portion and said connecting post.
9. The bellows load cell of claim 1, wherein a bottom wall thickness of said deformation chamber is less than a thickness of said flange portion.
10. A bellows load cell according to any one of claims 1 to 9, wherein said signal assembly comprises a signal connector which is sleeved outside said signal line, said signal connector being detachably connected to said connection hole of said post.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323069488.7U CN221571636U (en) | 2023-11-14 | 2023-11-14 | Bellows type weighing sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323069488.7U CN221571636U (en) | 2023-11-14 | 2023-11-14 | Bellows type weighing sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221571636U true CN221571636U (en) | 2024-08-20 |
Family
ID=92270701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323069488.7U Active CN221571636U (en) | 2023-11-14 | 2023-11-14 | Bellows type weighing sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221571636U (en) |
-
2023
- 2023-11-14 CN CN202323069488.7U patent/CN221571636U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201476927U (en) | Air pressure sensor | |
| CN106556488A (en) | A kind of strain-type six-dimension force sensor | |
| CN210322103U (en) | Small-torque flange type torque sensor | |
| CN210346954U (en) | Integrated three-dimensional force sensor | |
| CN115727923A (en) | Strain liquid level sensor | |
| CN221571636U (en) | Bellows type weighing sensor | |
| US7661317B2 (en) | High pressure transducer having an H shaped cross-section | |
| CN208187598U (en) | Load cell and dynamic assembly suspension force measuring sensors | |
| US3866464A (en) | Hydraulic load indicator | |
| CN113049070B (en) | A force sensor | |
| WO2020228700A1 (en) | Sensor and sensor manufacturing method | |
| CN208921347U (en) | High-protection type pressure transmitter | |
| CN216283819U (en) | Liquid level measurer and oil level meter system | |
| CN212585894U (en) | Shaft seat type sensor for sensing tension | |
| CN205719378U (en) | A kind of Novel pressure sensor | |
| CN214621409U (en) | Force-measuring weighing sensor | |
| CN110044418B (en) | Integrated combined displacement dynamometer | |
| CN203837784U (en) | A multifunctional weighing sensor | |
| US20090007682A1 (en) | High pressure transducer having an H shaped cross-section | |
| CN219474753U (en) | Integrated bridge load cell | |
| CN222993748U (en) | A high-precision column sensor structure with dust cover | |
| CN220819269U (en) | Single-shaft miniature pressing force transducer | |
| CN219348052U (en) | Force measuring calibration device | |
| CN219244852U (en) | Static torsion sensor with overload protection structure | |
| CN217637757U (en) | Low-height double-flange-surface high-precision sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |