CN109900398A - Squash type torque-measuring apparatus based on sheet type piezoresistor - Google Patents
Squash type torque-measuring apparatus based on sheet type piezoresistor Download PDFInfo
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- CN109900398A CN109900398A CN201910221293.9A CN201910221293A CN109900398A CN 109900398 A CN109900398 A CN 109900398A CN 201910221293 A CN201910221293 A CN 201910221293A CN 109900398 A CN109900398 A CN 109900398A
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Abstract
The present invention relates to a kind of squash type torque-measuring apparatus based on sheet type piezoresistor, belong to sensing detection technical field.Including shell, annular steelframe, three-pawl type structure, chip piezoresistor, connector, dynamometry disk, circuit board, the side of chip piezoresistor is attached on the pressure plare of three-pawl type structure, and the two sides of each pressure plare are symmetrically arranged amongst, the other side is just in contact with the notch of annular steelframe.When dynamometry disk is by external force, three-pawl type structure is transmitted the force to by connector, annular steelframe and three-pawl type structure squeeze chip piezoresistor, the signal measured and riding position, received signal is handled and is amplified, transmits out by data using communication bus.It solves chip force sensing resistance if other conditions are the same, obtains multiple measurement results different problems because of contact condition difference.Inductive signal can be stable holding zero, can be to avoid sluggish and creep problem.
Description
Technical field
The present invention relates to sensor detecting field, in particular to a kind of squash type based on sheet type piezoresistor
Torque-measuring apparatus, espespecially a kind of material property of combination chip force sensing resistance are aided with structure design appropriate and carry out torque measurement
Device.
Background technique
Torque sensor application range is very extensive, is mainly used for: motor, engine, torque wrench torque and function
The detection of rate manufactures in viscosimeter and process industrial and process industry.
Currently, the sensor of torque can be divided into three kinds: non-contact torque sensor, foil gauge torque sensor, phase
Differential torque rotary speed sensor.Wherein, foil gauge torque sensor uses strain measurement technology.Its principle is to utilize bullet
Property axis, paste strain gauge, constitute measuring bridge, when elastic shaft by torque act on occur miniature deformation, the resistance value of electric bridge is just
It can change, and then electric signal is changed, realize the measurement of torque.
Sheet type piezoresistor has that very thin thickness, range are smaller, characteristics are influenced etc. vulnerable to contact condition, is mainly used for
In various tensometers, accelerometer, semiconductor microphone and various pressure sensors.When it is used for torque sensor, in the presence of
The some problems in face: range is small, is easy to produce sluggish and creep, and when work identical by size and that contact condition is different
When firmly, different measurement results etc. can be obtained.
Summary of the invention
The purpose of the present invention is to provide a kind of squash type torque-measuring apparatus based on sheet type piezoresistor, solve
When chip piezoresistor is used for torque sensor, range very little is easy to produce sluggish and creep, in stress effect
The problems such as obtaining different measurement results because of contact condition difference.The present invention is rigid by two using sheet type piezoresistor
The extruding of body and generate force signal, by conversion to obtaining torque signal.The side of chip piezoresistor is attached to three-pawl type
On the pressure plare of structure, and the two sides of each pressure plare are symmetrically arranged amongst, the other side is just in contact with the notch of annular steelframe.
When dynamometry disk is by external force, dynamometry disk transmits the force to three-pawl type structure, annular steelframe and three by connector
Claw structure squeezes intermediate chip resistor, the signal measured according to chip force sensing resistance and riding position, to received letter
It number is handled and is amplified, transmit out by data using communication bus.
Above-mentioned purpose of the invention is achieved through the following technical solutions:
Squash type torque-measuring apparatus based on sheet type piezoresistor, shell lower end 1 and upper shell 11 pass through third group
Screw 8 is connected, it is characterised in that: the both ends of annular steelframe 17 are connected with shell lower end 1 and bearing insert 16 respectively, and lead to respectively
It is fixed to cross first group of screw 2, the 6th group of screw 15；Bearing insert 16, three-pawl type structure 4 respectively with the inside and outside circle of first bearing 3
It is connected, wherein three-pawl type structure 4 is equipped with bushing, prevents first bearing 3 from occurring between bearing insert 16 and three-pawl type structure 4
It slides axially；Circuit board 5 is connected by the 5th group of screw 13 with annular steelframe 17；Signal wire 18 is clipped in upper shell 11 and shell
Among lower end 1 and fixed；Connector 12 is connect by second group of screw 7 with three-pawl type structure 4, the inner ring of second bearing 6,
Outer ring is connected with bearing insert 16, connector 12 respectively, due to the limit of the bushing of the bushing and upper shell 11 of three-pawl type structure 4
Position effect, second bearing 6 are fixed between connector 12 and three-pawl type structure 4, can not slide axially；Connector 12 is logical
It crosses 8, the 4th groups of screws 9 of third group screw to be connected with three-pawl type structure 4, dynamometry disk 10, the torque that dynamometry disk 10 is generated
Connector 12 is passed to, then passes to three-pawl type structure 4, chip piezoresistor 14 is by the pressure plare in three-pawl type structure 4
Extruding with the notch of annular steelframe 17 and export electric signal.
Three or more equally distributed pressure plares in the three-pawl type structure 4.
The endface of the upper shell 11 is opened there are three groove, and cooperation sets that there are three convex on the dynamometry disk 10
Platform, the position of boss and the position of groove are corresponding；Wherein, the size of boss is less than the size of groove.
The chip piezoresistor 14 is symmetrically arranged amongst the two sides of the pressure plare in three-pawl type structure 4, is entirely surveying
Amount device not effect loaded when be just in contact with the notch of annular steelframe 17.
The material of the three-pawl type structure 4 and annular steelframe 17 is rigid material.
Input signal of the circuit board 5 by the output signal of chip piezoresistor 14, as circuit board 5.
The beneficial effects of the present invention are:
(1) pressure plare and annular steelframe are all made of rigid material in the present invention, can not only exclude the external force pair in non-measured direction
The influence of measurement result, and ensure every time to pressure plare load external force when, between pressure plare, chip piezoresistor and rigid frame
Contact condition it is constant always.Solves chip force sensing resistance if other conditions are the same, due to contact condition difference
Obtain multiple measurement results different problems.
(2) present invention is arranged symmetrically two chip piezoresistors in pressure plare two sides, measures positive and negative torque letter respectively
Number, and when the external force release applied, the holding zero that inductive signal can be stable can ask to avoid sluggish and creep
Topic.
(3) traditional strain-type torque sensor is that foil gauge is attached on elastomer mostly, and elastomer is generated because of stress
Deformation causes foil gauge resistance variations, then is measured to resistance value to achieve the purpose that survey torque.And the present invention is based on chip
The characteristic of force sensing resistance realizes torque measurement by the design to structure.Novel, structure is simple, easy to use.
(4) pressure plare is uniformly distributed using three-pawl type belongs to a kind of special circumstances of the invention.Wherein, the quantity of pressure plare
The range ability for determining sensor can be promoted effectively according to demand that is, under the premise of not changing force sensitive resistive material
The range of sensor.It is practical.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative example and its explanation is used to explain the present invention, and is not constituted improper limitations of the present invention.
Fig. 1 is isometric side view of the invention；
Fig. 2 is structural blast schematic diagram of the invention；
Fig. 3 is side view of the invention；
Fig. 4 is the A-A schematic cross-sectional view of Fig. 3；
Fig. 5 is the B-B schematic cross-sectional view of Fig. 3；
Fig. 6 is the schematic diagram of Calculating Torque during Rotary in the present invention；
Fig. 7 is schematic block circuit diagram of the invention.
In figure: 1, shell lower end；2, first group of screw；3, first bearing；4, three-pawl type structure；5, circuit board；6, second
Bearing；7, second group of screw；8, third group screw；9, the 4th group of screw；10, dynamometry disk；11, upper shell；12, it connects
Device；13, the 5th group of screw；14, chip piezoresistor；15, the 6th group of screw；16, bearing insert；17, annular steelframe；18,
Signal wire.
Specific embodiment
Detailed content and its specific embodiment of the invention are further illustrated with reference to the accompanying drawing.
Referring to Fig. 1 to Fig. 7, the squash type torque-measuring apparatus of the invention based on sheet type piezoresistor, including it is outer
1, first group of shell lower end screw 2, first bearing 3, three-pawl type structure 4, circuit board 5, second bearing 6, second groups of screws 7, third
Group screw 8, the 4th group of screw 9, dynamometry disk 10, upper shell 11, connector 12, the 5th group of screw 13, chip force sensing resistance
Device 14, the 6th group of screw 15, bearing insert 16, annular steelframe 17, signal wire 18, in order to protect and fix the portion of sensor internal
Divide part, shell lower end 1 is connected with upper shell 11, and is fixed by third group screw 8.The both ends of annular steelframe 17
It is connected respectively with shell lower end 1 and bearing insert 16, and fixed by first group of screw 2, the 6th group of screw 15 respectively；Jewel
Set 16, three-pawl type structure 4 are connected with the inside and outside circle of first bearing 3 respectively, wherein three-pawl type structure 4 is equipped with bushing, effect
To prevent first bearing 3 from sliding axially between bearing insert 16 and three-pawl type structure 4；The one of chip piezoresistor 14
Side is individually fixed at three pawls of three-pawl type structure 4, and the other side is just in contact with annular 17 notch of steelframe, and every pack
Formula piezoresistor 14 keeps identical relative to the distance of 4 central axis of three-pawl type structure；17 notch of pressure plare 4 and annular steelframe
The design at place ensures when loading external force to pressure plare 4 every time, pressure plare 4, chip piezoresistor 14 and annular rigid frame 17 it
Between contact condition it is constant always.Solves chip force sensing resistance if other conditions are the same, because of contact condition difference
And obtain multiple measurement results different problems.Circuit board 5 is fixed on annular steelframe 17 using the 5th group of screw 13,
In, the signal input of circuit board 5, output port are connected with the output end of chip piezoresistor 14 and signal wire 18 respectively,
Effect is to be analyzed and processed the output signal of chip piezoresistor 14, and by signal wire 18, by treated, signal is transmitted
Out；Signal wire 18 is clipped among upper shell 11 and shell lower end 1 and is fixed.
Connector 12 is connect by second group of screw 7 with three-pawl type structure 4, the inner ring of second bearing 6, outer ring respectively with axis
It is connected to hold bushing 16, connector 12, and 6 inner ring of second bearing, outer ring are respectively by the bushing of three-pawl type structure 4 and upper shell 11
Bushing limited, to prevent second bearing 6 from sliding axially between connector 12 and three-pawl type structure 4；Connector
12 are connected by 8, the 4th groups of screws 9 of third group screw with three-pawl type structure 4, dynamometry disk 10, and it acts as by dynamometry disk
10 torques generated pass to connector 12, then pass to three-pawl type structure 4, and chip piezoresistor 14 is by three-pawl type structure
The extruding of the notch of pressure plare in 4 and annular steelframe 17 and export electric signal.It opens there are three recessed the endface of upper shell 11
Slot, cooperation sets that there are three boss on the dynamometry disk 10, and the position of boss and the position of groove are corresponding；Wherein, boss
Size outline is less than the size of groove, and design is advantageous in that while ensure that torque transmitting in this way, and is convenient to and to survey
The connection of moment element ensure that overall structure good appearance.
The design of equally distributed three pressure plares in the three-pawl type structure 4, a kind of special feelings only of the invention
Condition, wherein the number of pressure plare can need suitably to be changed with range.
The chip piezoresistor 14 is symmetrically arranged amongst the two sides of the pressure plare in three-pawl type structure 4, is entirely surveying
Amount device not effect loaded when be just in contact with the notch of annular steelframe 17.The design advantage is: positive and negative torque difference
Chip piezoresistor by being distributed in pressure plare two sides measures, and when the external force release applied, inductive signal can
It, can be to avoid sluggish and creep problem with stable holding zero.
The material of the three-pawl type structure 4 and annular steelframe 17 is rigid material.It therefore, will not during reverse cyclic loadings
Any deformation is generated, the contact shape of pressure plare when ensure that each load in three-pawl type structure 4 and the notch of annular steelframe 17
State is constant always, i.e., each measurement result has good repeatability.It is identical in other conditions to avoid chip piezoresistor
In the case where, multiple measurement results different problems are obtained because of contact condition difference.
Shown in Figure 6, chip piezoresistor 14 is clipped among annular steelframe 17 and pressure plare, annular steelframe, pressure
Plate all chooses rigid material.When external torque acts on dynamometry disk 10, pressure is transmitted torque to by connector 12
On plate, the interaction force generated between pressure plare and annular steelframe 17 is measured by chip piezoresistor.Two chips
Piezoresistor is arranged symmetrically in pressure plare two sides, measures the power in positive and negative direction respectively, and works as applied external force release
When, the holding zero that inductive signal can be stable can be to avoid sluggish and creep problem.Structure of the invention uses this design
It also solves chip force sensing resistance if other conditions are the same, obtains multiple measurement results not because of contact condition difference
Same problem.When by positive torque, the chip piezoresistor of downside is squeezed and generates signal, the chip power of upside
Sensitive resistor is not affected by extruding without generating signal；When by positive torque, the chip piezoresistor of upside is squeezed
And signal is generated, the chip piezoresistor of downside is not affected by extruding without generating signal.Resulting torque arithmetic formula are as follows:
T=n*F*L
Wherein, n is the number of pressure plare, and F is the interaction force of pressure plare and annular steelframe, and L is that chip piezoresistor arrives
The distance of center sensor axis.
Structure is illustrated by taking 3 pressure plares as an example in the present invention, therefore three-pawl type structure is only one kind of the invention
Special circumstances.It, can if thinking effectively to improve the range of sensor according to demand under the premise of not changing force sensitive resistive material
To pass through the length of the size of n or L.
Shown in Figure 7, schematic block circuit diagram of the invention includes following components altogether: signal processing, amplification
Circuit part, master controller part and communications portion.Circuit board 5 is by the output signal of chip piezoresistor 14, as circuit
The input signal of plate 5.A1 in figure, A2, A3 are respectively in Fig. 6 from the output signal of upside chip piezoresistor, B1,
B2, B3 are respectively from the output signal of downside chip piezoresistor in Fig. 6, and the input signal as circuit board is by letter
Number preprocessing module is pre-processed, in order to which amplifying circuit amplifies signal.Then by treated, signal feeding is put
Big circuit is transmitted to master control borad by serial ports by amplified signal；Master controller part includes Context-M4 processing
Device, ADC signal acquisition module and CAN controller part.Wherein Context-M4 acquires signal by ADC, at signal
Reason, then conveys relevant instruction information by indicator light.The treated signal in master control borad inside is by CAN controller and outside
Portion's equipment is communicated.
The foregoing is merely preferred embodiments of the invention, are not intended to restrict the invention, for the technology of this field
For personnel, the invention may be variously modified and varied.All any modification, equivalent substitution, improvement and etc. made for the present invention,
It should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of squash type torque-measuring apparatus based on sheet type piezoresistor, shell lower end (1) and upper shell (11)
By third group screw (8) be connected, it is characterised in that: the both ends of annular steelframe (17) respectively with shell lower end (1) and jewel
It covers (16) to be connected, and fixed by first group of screw (2), the 6th group of screw (15) respectively；Bearing insert (16), three-pawl type structure
(4) it is connected respectively with the inside and outside circle of first bearing (3), wherein three-pawl type structure (4) is equipped with bushing, prevents first bearing (3)
It slides axially between bearing insert (16) and three-pawl type structure (4)；Circuit board (5) passes through the 5th group of screw (13) and ring
Shaped steel frame (17) is connected；Signal wire (18) is clipped among upper shell (11) and shell lower end (1) and is fixed；Connector
(12) connect with three-pawl type structure (4) by second group of screw (7), the inner ring of second bearing (6), outer ring respectively with bearing insert
(16), connector (12) is connected, due to the position-limiting action of the bushing of the bushing and upper shell (11) of three-pawl type structure (4), the
Two bearings (6) are fixed between connector (12) and three-pawl type structure (4), can not be slid axially；Connector (12) is logical
Cross third group screw (8), the 4th group of screw (9) is connected with three-pawl type structure (4), dynamometry disk (10), by dynamometry disk (10)
The torque of generation passes to connector (12), then passes to three-pawl type structure (4), and chip piezoresistor (14) is by three-pawl type
The extruding of pressure plare in structure (4) and the notch of annular steelframe (17) and export electric signal.
2. the squash type torque-measuring apparatus according to claim 1 based on sheet type piezoresistor, it is characterised in that:
Three or more equally distributed pressure plares in the three-pawl type structure (4).
3. the squash type torque-measuring apparatus according to claim 1 based on sheet type piezoresistor, it is characterised in that:
The endface of the upper shell (11) is opened there are three groove, and cooperation sets that there are three boss on the dynamometry disk (10), convex
The position of platform and the position of groove are corresponding；Wherein, the size of boss is less than the size of groove.
4. the squash type torque-measuring apparatus according to claim 1 based on sheet type piezoresistor, it is characterised in that:
The chip piezoresistor (14) is symmetrically arranged amongst the two sides of the pressure plare in three-pawl type structure (4), in entire measurement dress
It is just in contact with the notch of annular steelframe (17) when setting not effect loaded.
5. the squash type torque-measuring apparatus according to claim 1 or 4 based on sheet type piezoresistor, feature exist
In: the material of the three-pawl type structure (4) and annular steelframe (17) is rigid material.
6. the squash type torque-measuring apparatus according to claim 1 based on sheet type piezoresistor, it is characterised in that:
Input signal of the circuit board (5) by the output signal of chip piezoresistor (14), as circuit board (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910221293.9A CN109900398B (en) | 2019-03-22 | 2019-03-22 | Extrusion type torque measuring device based on sheet type force sensitive resistor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910221293.9A CN109900398B (en) | 2019-03-22 | 2019-03-22 | Extrusion type torque measuring device based on sheet type force sensitive resistor |
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| CN109900398A true CN109900398A (en) | 2019-06-18 |
| CN109900398B CN109900398B (en) | 2023-09-29 |
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| CN201910221293.9A Active CN109900398B (en) | 2019-03-22 | 2019-03-22 | Extrusion type torque measuring device based on sheet type force sensitive resistor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111426412A (en) * | 2020-04-26 | 2020-07-17 | 华南理工大学 | Annular stress sensing device suitable for GI L three-post insulator and detection method |
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| Publication number | Publication date |
|---|---|
| CN109900398B (en) | 2023-09-29 |
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