CN112213006A - Overload protection method and structure of force sensor - Google Patents
Overload protection method and structure of force sensor Download PDFInfo
- Publication number
- CN112213006A CN112213006A CN202011052997.7A CN202011052997A CN112213006A CN 112213006 A CN112213006 A CN 112213006A CN 202011052997 A CN202011052997 A CN 202011052997A CN 112213006 A CN112213006 A CN 112213006A
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- China
- Prior art keywords
- screw
- elastic body
- force sensor
- deformation
- threaded hole
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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
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/225—Measuring circuits therefor
- G01L1/2262—Measuring circuits therefor involving simple electrical bridges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
- G01L19/0618—Overload protection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
- G01L9/04—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of resistance-strain gauges
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Force In General (AREA)
Abstract
The invention discloses an overload protection method and a structure of a force sensor.A threaded hole is processed at the bottom of the force sensor, the threaded hole is positioned right below an elastomer deformation area of the force sensor, and the axial direction of the threaded hole is parallel to the deformation direction of the elastomer; the top end of the screw is screwed into the threaded hole until the distance between the top end of the screw and the bottom surface of the elastic body is the same as the deformation of the elastic body in a full range. The elastic part is limited by the screw, the distance between the top end of the screw and the bottom surface of the elastic body is the same as the deformation of the elastic body in the full range, so that the deformation of the elastic body cannot exceed the deformation of the elastic body in the full range all the time, and the force sensor is protected from overload; the screw cooperation screw hole can the interval of adjusting screw and elastomer bottom surface, makes the interval the same with the deflection of elastomer full scale, reaches best overload protection effect to after the regulation is accomplished, the screw can be fixed in the screw hole through the screw thread, guarantees long-term overload protection effect.
Description
Technical Field
The invention belongs to the field of sensor production, and relates to an overload protection method and structure of a force sensor.
Background
Once the existing force sensor has overload phenomenon in the using process, accidents are easy to happen, and therefore the force sensor is very necessary to be provided with an overload protection mechanism, and the existing force sensor mostly adopts a method of machining an overload prevention groove on an elastic body by machining, so that the elastic body is prevented from being plastically deformed after being overloaded, and the purpose of safety protection is achieved. However, because the deformation of the elastic body in the full range is less than 0.1mm, the minimum clearance of the formed overload protection groove is about 0.2mm by adopting a mechanical processing method, and the clearance is too large, so that the aim of safety protection cannot be fulfilled.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned drawbacks of the prior art and to provide an overload protection method and structure for a force sensor, which can form a gap having the same size as the deformation of an elastic body of the force sensor to protect the force sensor from overload.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the overload protection method of the force sensor comprises the steps that a threaded hole is machined in the bottom of the force sensor, the threaded hole is located right below an elastic body deformation area of the force sensor, and the axial direction of the threaded hole is parallel to the deformation direction of the elastic body; the top end of the screw is screwed into the threaded hole until the distance between the top end of the screw and the bottom surface of the elastic body is the same as the deformation of the elastic body in a full range.
Preferably, a limiting piece is inserted between the limiting hole and the bottom surface of the elastic body, the thickness of the limiting piece is the same as the deformation of the elastic body in a full range, and the top end of the screw is screwed into the threaded hole until the top end of the screw contacts with the limiting piece.
Furthermore, the limiting sheet adopts a feeler gauge.
Preferably, the top end of the screw is screwed into the threaded hole until the top end of the screw contacts the bottom surface of the elastic body, a load towards the screw is applied to the top surface of the elastic body, the application direction is collinear with the axis of the screw, the screw is subjected to irreversible axial deformation until the axial deformation of the screw is the same as the full-scale deformation of the elastic body, and the load is removed.
Further, a load of 8 to 12 times is applied to the top surface of the elastic body.
Preferably, when the distance between the top end of the screw and the bottom surface of the elastic body is the same as the deformation of the elastic body in a full range, the bottom end of the screw is welded with the threaded hole.
Preferably, the force sensor is a parallel beam sensor, a bridge sensor or a cantilever beam sensor.
Preferably, the threaded hole is provided in a region where the elastic body is deformed most.
Preferably, the screw and the housing of the force sensor are made of the same material.
An overload protection structure of a force sensor based on the method of any one of the preceding claims, comprising a screw;
the bottom of the force sensor is provided with a threaded hole, the threaded hole is positioned right below the deformation area of the elastic body of the force sensor, and the axial direction of the threaded hole is parallel to the deformation direction of the elastic body; the screw is in threaded connection with the threaded hole, one end of the screw, which is close to the elastic body, is the top end of the screw, and the distance between the top end of the screw and the bottom surface of the elastic body is the same as the deformation of the elastic body in a full range.
Compared with the prior art, the invention has the following beneficial effects:
according to the method, the elastic part is limited through the screw, the distance between the top end of the screw and the bottom surface of the elastic body is the same as the deformation of the elastic body in the full range, so that the deformation of the elastic body cannot exceed the deformation of the elastic body in the full range all the time, and the force sensor is subjected to overload protection; the screw cooperation screw hole can the interval of adjusting screw and elastomer bottom surface, makes the interval the same with the deflection of elastomer full scale, reaches best overload protection effect to after the regulation is accomplished, the screw can be fixed in the screw hole through the screw thread, guarantees long-term overload protection effect.
Furthermore, the distance between the top end of the screw and the bottom surface of the elastic body is adjusted through the thickness of the limiting piece, repeated measurement is not needed, and the screw can be adjusted in place at one time, so that the positioning device is convenient and fast to use.
Further, through applying load, make the screw carry out irreversible axial deformation to the interval of control screw top and elastomer bottom surface, and at screw deformation in-process, take place the distortion with the screw thread of screw hole, make screw and unable separation of screw hole, thereby keep the screw position invariable, guarantee long-term overload protection effect.
Further, weld screw bottom and screw hole to keep screw position invariable, guarantee long-term overload protection effect.
According to the device, the elastic part is limited through the screw, the distance between the top end of the screw and the bottom surface of the elastic body is the same as the deformation of the elastic body in the full range, so that the deformation of the elastic body cannot exceed the deformation of the elastic body in the full range all the time, and the force sensor is subjected to overload protection; the screw cooperation screw hole can the interval of adjusting screw and elastomer bottom surface, makes the interval the same with the deflection of elastomer full scale, reaches best overload protection effect to the screw can be fixed in the screw hole through the screw thread, guarantees long-term overload protection effect.
Drawings
FIG. 1 is a schematic view of the overload protection structure of the parallel beam sensor of the present invention;
FIG. 2 is a schematic diagram of the overload protection structure of the bridge sensor according to the present invention;
fig. 3 is a schematic view of an overload protection structure of a cantilever sensor according to the present invention.
Wherein: 1-a screw; 2-an elastomer.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
the overload protection method of the force sensor comprises the steps that a threaded hole is machined in the bottom of the force sensor, the threaded hole is located right below a maximum deformation area of an elastic body 2 of the force sensor, and the axial direction of the threaded hole is parallel to the deformation direction of the elastic body 2; the top end of the screw 1 is screwed into the threaded hole until the distance between the top end of the screw 1 and the bottom surface of the elastic body 2 is the same as the deformation of the elastic body 2 in a full range. The screw 1 and the housing of the force sensor are made of the same material.
In a real-time process, two schemes may be used for implementation.
The first scheme is as follows: processing a threaded hole at the bottom of the force sensor, wherein the threaded hole is positioned right below the maximum deformation area of the elastic body 2 of the force sensor, and the axial direction of the threaded hole is parallel to the deformation direction of the elastic body 2; insert spacing piece between spacing hole and 2 bottoms surfaces of elastomer, spacing piece adopts the cock piece in this embodiment, and spacing piece thickness is the same with the deflection of 2 full ranges of elastomer, and 1 top screw in screw hole of screw is until 1 top of screw and spacing piece contact, welds 1 bottom of screw and screw hole.
Scheme II: processing a threaded hole at the bottom of the force sensor, wherein the threaded hole is positioned right below the maximum deformation area of the elastic body 2 of the force sensor, and the axial direction of the threaded hole is parallel to the deformation direction of the elastic body 2; screwing the top end of the screw 1 into the threaded hole until the top end of the screw 1 contacts the bottom surface of the elastic body 2, applying 8-12 times of load towards the screw 1 on the top surface of the elastic body 2, in the embodiment, applying 8-12 times of load on the top surface of the elastic body 2, wherein the applying direction is collinear with the axis of the screw 1, enabling the screw 1 to carry out irreversible axial deformation until the axial deformation of the screw 1 is the same as the full-scale deformation of the elastic body 2, removing the load, and welding the bottom end of the screw 1 and the threaded hole.
The overload protection structure of the force sensor processed by the method has the advantages that the bottom of the force sensor is provided with a threaded hole, the threaded hole is positioned right below the maximum deformation area of the elastic body 2 of the force sensor, and the axial direction of the threaded hole is parallel to the deformation direction of the elastic body 2; the screw 1 is in threaded connection with the threaded hole, one end of the screw 1, which is close to the elastic body 2, is the top end of the screw 1, and the distance between the top end of the screw 1 and the bottom surface of the elastic body 2 is the same as the deformation of the elastic body 2 in a full range.
The force sensor can adopt a parallel beam sensor, a bridge sensor or a cantilever beam sensor, and the sensors in the three sensors can adopt the method and the structure.
The first embodiment is as follows:
as shown in fig. 1, when the force sensor is a parallel beam sensor, a threaded hole is arranged at the position where the deformation of the stressed beam is maximum, the threaded hole is positioned right below the region where the deformation of the elastic body 2 of the force sensor is maximum, and the axial direction of the threaded hole is parallel to the deformation direction of the elastic body 2; the screw 1 is in threaded connection with the threaded hole, one end of the screw 1, which is close to the elastic body 2, is the top end of the screw 1, and the distance between the top end of the screw 1 and the bottom surface of the elastic body 2 is the same as the deformation of the elastic body 2 in a full range.
Example two:
as shown in fig. 2, when the force sensor is a bridge sensor, a threaded hole is formed at the position where the deformation of the stressed beam is maximum, the threaded hole is located right below the region where the deformation of the elastic body 2 of the force sensor is maximum, and the axial direction of the threaded hole is parallel to the deformation direction of the elastic body 2; the screw 1 is in threaded connection with the threaded hole, one end of the screw 1, which is close to the elastic body 2, is the top end of the screw 1, and the distance between the top end of the screw 1 and the bottom surface of the elastic body 2 is the same as the deformation of the elastic body 2 in a full range.
Example three:
as shown in fig. 3, when the force sensor is a cantilever beam sensor, a threaded hole is arranged at the position where the deformation of the stressed beam is maximum, the threaded hole is positioned right below the region where the deformation of the elastic body 2 of the force sensor is maximum, and the axial direction of the threaded hole is parallel to the deformation direction of the elastic body 2; the screw 1 is in threaded connection with the threaded hole, one end of the screw 1, which is close to the elastic body 2, is the top end of the screw 1, and the distance between the top end of the screw 1 and the bottom surface of the elastic body 2 is the same as the deformation of the elastic body 2 in a full range.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. The overload protection method of the force sensor is characterized in that a threaded hole is machined in the bottom of the force sensor, the threaded hole is located right below a deformation area of an elastic body (2) of the force sensor, and the axial direction of the threaded hole is parallel to the deformation direction of the elastic body (2); the top end of the screw (1) is screwed into the threaded hole until the distance between the top end of the screw (1) and the bottom surface of the elastic body (2) is the same as the deformation of the elastic body (2) in the full range.
2. The overload protection method for the force sensor according to claim 1, wherein a limiting piece is inserted between the limiting hole and the bottom surface of the elastic body (2), the thickness of the limiting piece is the same as the full-scale deformation of the elastic body (2), and the top end of the screw (1) is screwed into the threaded hole until the top end of the screw (1) contacts with the limiting piece.
3. The overload protection method for the force sensor according to claim 2, wherein the limiting piece is a feeler.
4. The overload protection method for the force sensor according to claim 1, wherein the top end of the screw (1) is screwed into the threaded hole until the top end of the screw (1) contacts the bottom surface of the elastic body (2), a load is applied to the top surface of the elastic body (2) towards the screw (1), the application direction is collinear with the axis of the screw (1), the screw (1) is subjected to irreversible axial deformation until the axial deformation of the screw (1) is the same as the full-scale deformation of the elastic body (2), and the load is removed.
5. The overload protection method for a force sensor according to claim 4, wherein a load of 8 to 12 times is applied to the top surface of the elastic body (2).
6. The overload protection method for the force sensor according to claim 1, wherein when the distance between the top end of the screw (1) and the bottom surface of the elastic body (2) is the same as the deformation of the elastic body (2) in a full range, the bottom end of the screw (1) is welded with the threaded hole.
7. The method of claim 1, wherein the force sensor is a parallel beam sensor, a bridge sensor, or a cantilever beam sensor.
8. The overload protection method for a force sensor according to claim 1, wherein the threaded hole is provided in a region where the elastic body (2) is most deformed.
9. Method for overload protection of a force sensor according to claim 1, characterised in that the screw (1) and the housing of the force sensor are of the same material.
10. An overload protection structure of a force sensor based on the method of any one of claims 1-9, characterized by comprising a screw (1);
the bottom of the force sensor is provided with a threaded hole, the threaded hole is positioned right below a deformation area of the elastic body (2) of the force sensor, and the axial direction of the threaded hole is parallel to the deformation direction of the elastic body (2); the screw (1) is in threaded connection with the threaded hole, one end, close to the elastic body (2), of the screw (1) is the top end of the screw (1), and the distance between the top end of the screw (1) and the bottom surface of the elastic body (2) is the same as the deformation of the elastic body (2) in a full range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011052997.7A CN112213006A (en) | 2020-09-29 | 2020-09-29 | Overload protection method and structure of force sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011052997.7A CN112213006A (en) | 2020-09-29 | 2020-09-29 | Overload protection method and structure of force sensor |
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| Publication Number | Publication Date |
|---|---|
| CN112213006A true CN112213006A (en) | 2021-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011052997.7A Pending CN112213006A (en) | 2020-09-29 | 2020-09-29 | Overload protection method and structure of force sensor |
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| Country | Link |
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| CN (1) | CN112213006A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116989876A (en) * | 2023-07-27 | 2023-11-03 | 中山精量衡器制造有限公司 | Weighing device with overload protection function |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2087781U (en) * | 1990-11-09 | 1991-10-30 | 余姚传感器厂 | Full-weighing section track type weighing and force-measuring transducer |
| CN101337355A (en) * | 2008-08-29 | 2009-01-07 | 哈尔滨工业大学 | Robot delicate finger-joint torque sensor with torque overload protection function |
| CN102322990A (en) * | 2011-08-26 | 2012-01-18 | 重庆大唐科技股份有限公司 | Force transducer with overload protection function and adjustable overload capacity |
| CN207180848U (en) * | 2017-09-19 | 2018-04-03 | 霍丁格包尔文(苏州)电子测量技术有限公司 | Two-way overload protective sensor construction |
| CN208012719U (en) * | 2018-04-11 | 2018-10-26 | 泰科思（深圳）传感器有限公司 | A kind of ripple tube sensor with antioverloading function |
| CN208206368U (en) * | 2018-04-17 | 2018-12-07 | 宁波柯力传感科技股份有限公司 | Axis through type tension sensor |
-
2020
- 2020-09-29 CN CN202011052997.7A patent/CN112213006A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2087781U (en) * | 1990-11-09 | 1991-10-30 | 余姚传感器厂 | Full-weighing section track type weighing and force-measuring transducer |
| CN101337355A (en) * | 2008-08-29 | 2009-01-07 | 哈尔滨工业大学 | Robot delicate finger-joint torque sensor with torque overload protection function |
| CN102322990A (en) * | 2011-08-26 | 2012-01-18 | 重庆大唐科技股份有限公司 | Force transducer with overload protection function and adjustable overload capacity |
| CN207180848U (en) * | 2017-09-19 | 2018-04-03 | 霍丁格包尔文(苏州)电子测量技术有限公司 | Two-way overload protective sensor construction |
| CN208012719U (en) * | 2018-04-11 | 2018-10-26 | 泰科思（深圳）传感器有限公司 | A kind of ripple tube sensor with antioverloading function |
| CN208206368U (en) * | 2018-04-17 | 2018-12-07 | 宁波柯力传感科技股份有限公司 | Axis through type tension sensor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116989876A (en) * | 2023-07-27 | 2023-11-03 | 中山精量衡器制造有限公司 | Weighing device with overload protection function |
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Application publication date: 20210112 |