CN108981984B - Load measuring device for high-temperature conditions - Google Patents
Load measuring device for high-temperature conditions Download PDFInfo
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- CN108981984B CN108981984B CN201810709651.6A CN201810709651A CN108981984B CN 108981984 B CN108981984 B CN 108981984B CN 201810709651 A CN201810709651 A CN 201810709651A CN 108981984 B CN108981984 B CN 108981984B
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- load transmission
- transmission rod
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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
- G01L1/2268—Arrangements for correcting or for compensating unwanted effects
- G01L1/2281—Arrangements for correcting or for compensating unwanted effects for temperature variations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/066—Special adaptations of indicating or recording means with electrical indicating or recording means
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Abstract
The invention relates to a load measuring device used under a high-temperature condition, which comprises a measuring element, a measuring bridge and a load transmission rod, wherein the measuring bridge obtains a load value through data conversion according to the action of the measuring element on the load transmission rod, the load measuring device also comprises a measuring chamber, a temperature compensation circuit and a physical cooling mechanism, one end of the load transmission rod is a linkage end, the other end of the load transmission rod is a measuring end, the measuring element comprises an elastic part and a resistance strain gauge, the elastic part is fixed between the measuring end and the measuring chamber, the resistance strain gauge is arranged on each elastic part, when the load transmission rod rotates circumferentially relative to the measuring chamber, the deformation of the elastic part is converted into resistance data through the resistance strain gauge, the resistance data are transmitted to the measuring bridge through the temperature compensation circuit, and the physical cooling mechanism is arranged in the measuring. By adopting the scheme, the invention provides the load measuring device for improving the accuracy of measured data under the high-temperature condition.
Description
Technical Field
The invention relates to the field of load measurement, in particular to a load measuring device used under a high-temperature condition.
Background
In the mechanical property test of materials, a load measuring device is often used for measuring load values, that is, the values of external forces and other factors of internal force and deformation generated by a structure or a component, including axial force and rotation moment, and is widely applied to various fields requiring mechanical load data measurement.
In order to improve the accuracy of load measurement, some elastic sensitive elements are arranged in the load measurement device for measurement, but in the actual measurement process, the elastic sensitive elements generate heat, and the heat generated by the heat drifts the output signal and the conversion factor of the device, so that the obtained data is distorted.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a load measuring device for high-temperature conditions, which improves the accuracy of measured data.
In order to achieve the purpose, the invention provides the following technical scheme: the load measuring device comprises a measuring element, a measuring bridge and a load transmission rod, wherein the measuring bridge obtains a load value according to data conversion obtained by the action of the measuring element on the load transmission rod, and the load measuring device is characterized in that: the device comprises a measuring chamber, a temperature compensation circuit and a physical cooling mechanism, wherein one end of a load transmission rod is in linkage fit with a measured component through a linkage end, the other end of the load transmission rod extends into the measuring chamber as a measuring end and can rotate in the circumferential direction and move in the axial direction relative to the measuring chamber, the measuring element comprises an elastic part and a resistance strain gauge, the elastic part is fixed between the measuring end and the measuring chamber, the resistance strain gauge is installed on each elastic part, when the load transmission rod rotates in the circumferential direction or moves in the axial direction relative to the measuring chamber, the resistance strain gauge converts the deformation of the elastic part into resistance data, the resistance data are transmitted to a measuring bridge through the temperature compensation circuit, and the physical cooling mechanism is arranged in the measuring chamber and cools the measuring element through contact conduction.
By adopting the technical scheme, in order to control the influence of temperature on the measuring element, the scheme respectively plays a role in two modes of physical compensation and electrical compensation, ensures that the temperature of the measuring element is maintained in a low and stable state, the physical cooling mechanism takes away the heat of the measuring element in a contact heat exchange mode, the temperature compensation circuit pre-corrects the data obtained by the resistance strain gauge in an electrical compensation mode according to the actual temperature value and transmits the data to the measuring bridge, the two modes are combined to greatly improve the accurate value of the obtained load value, in addition, the measuring element formed by matching an elastic piece fixed between the measuring end and the measuring chamber with the resistance strain gauge is selected, the deformation amplitude for detection generated when the load transmission rod acts is enlarged, the measurement of axial force and rotating torque is more sensitive, and the accuracy of data acquisition is further improved, the upper temperature limit of the test is obviously improved.
The invention is further configured to: the quantity of elastic component be two at least to set up respectively in load transmission pole periphery, physics cooling body include cooling channel and UNICOM's passageway, cooling channel set up in the elastic component, one end extends to the measurement outdoor side, and the other end extends to load transmission pole, at least one the cooling channel of elastic component one as the cooling admission passage that supplies the coolant to get into, at least one the cooling channel of elastic component as the cooling outflow passageway that supplies the coolant to flow out, the UNICOM's passageway set up in load transmission pole to carry out the UNICOM with cooling admission passage and cooling outflow passageway.
Through adopting above-mentioned technical scheme, choose for use the circulation bridge of elastic component as coolant, the rational utilization structure, the coolant carries out the heat exchange from the elastic component is inside simultaneously, make cooling efficiency and comprehensiveness reach the optimum, can cool down measuring element in the short time, avoid the produced deviation of temperature fluctuation and temperature rise, and rationally utilize load transmission pole "transfer station" as the coolant, "carry out the UNICOM with the cooling channel of each elastic component, the coolant of input can be exported fast, the structure is greatly simplified, realize passing through fast and the circulation of coolant, further improve cooling efficiency, also be the cooling to load transmission pole simultaneously, avoid external heat to produce the influence from load transmission pole transmission to elastic component, many-sided combination guarantees the stability of temperature.
The invention is further configured to: the coolant is R11 coolant, R113 coolant, R114 coolant or R21 coolant.
By adopting the technical scheme, the application environment is in a high-temperature low-pressure state, so that the performance is better by selecting the plurality of coolants.
The invention is further configured to: the load transmission rod is composed of a loop bar and a core bar, the loop bar and the core bar are coaxially arranged and are provided with insertion cavities for the core bar to be inserted, a linkage pin enabling the loop bar and the core bar to synchronously act penetrates through the loop bar and the core bar, the end part of the core bar corresponding to the linkage end extends out of the loop bar and is in linkage fit with a measured member, the elastic part is fixed on the periphery of the end part of the loop bar corresponding to the measuring end, and the other end of the core bar in linkage fit with the measured member is provided with a limiting disc in butt fit with the end face of the loop bar.
Through adopting above-mentioned technical scheme, divide into loop bar and core bar two parts with load transmission pole, core bar one end is supported to join in marriage through spacing dish and loop bar terminal surface, and the other end cooperates with the linkage of measurand component, and both have better installation stability when the measurand component moves, improve the action synchronism promptly, guarantee measuring accuracy, and the dismouting of loop bar and core bar can be realized to the plug interlocking pin, and the operation is more convenient.
The invention is further configured to: the measuring chamber is provided with a disassembly and assembly port and an end cover for sealing the disassembly and assembly port, and the disassembly and assembly port is used for a worker to press the limiting disc to draw the core rod out of the loop bar.
Through adopting above-mentioned technical scheme, the dismouting mouthful supplies the staff to press down spacing dish and takes the core bar out from the other end of the relative measurand component of loop bar, improves the convenience of dismouting.
The invention is further configured to: the core bar include reposition of redundant personnel portion and portion of converging, the cross-section of reposition of redundant personnel portion be the cross, reposition of redundant personnel portion with insert the intracavity inner wall and form four shunt passageways with different cooling channel UNICOMs respectively, the cross-section of portion of converging be circular, the portion of converging with insert the intracavity inner wall and form the passageway of converging that supplies different shunt passageways UNICOMs, shunt passageway and the passageway combination of converging constitute the UNICOM passageway.
Through adopting above-mentioned technical scheme, optimize the structure, the UNICOM passageway that is used for circulating the coolant is formed automatically to the time when the core bar inserts the loop bar, simplifies the processing structure, inserts the chamber and is complete cylindric when the core bar takes out the loop bar, is convenient for wash.
The invention is further configured to: the measuring chamber is arranged in a sealing way.
Through adopting above-mentioned technical scheme, sealed measuring chamber avoids impurity to get into in the measuring chamber, pollutes the measuring environment in the measuring chamber.
The invention is further configured to: and a plurality of resistance strain gauges are arranged on the deformed side surface of each elastic piece in a surrounding manner to form a resistance strain gauge group.
By adopting the technical scheme, the plurality of resistance strain gauges form the resistance strain gauge group, and deformation of each part can be detected constantly, so that the obtained data is more accurate and comprehensive, and the working states of the resistance strain gauges are synchronous.
The invention is further configured to: the quantity of elastic component be four to arrange in load transmission pole periphery equidistance along load transmission pole circumference.
Through adopting above-mentioned technical scheme, the quantity of elastic component is preferred four, and load transmission pole circumference equidistance arranges in load transmission pole periphery, and the structure is better when guaranteeing measurement accuracy, can effectively eliminate under the circumstances that load transmission pole and loading device's movable rod is not centering or the sample terminal surface is not parallel in the tensile experiment, transverse component when measuring axial load is to measuring result's influence.
The invention is further described with reference to the following figures and detailed description.
Drawings
FIG. 1 is a front partial cross-sectional view of an embodiment of the present invention;
FIG. 2 is a sectional view taken along line A of FIG. 1;
FIG. 3 is a sectional view taken along line B of FIG. 1;
FIG. 4 is a circuit diagram of a temperature compensation circuit according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of a measurement bridge in accordance with an embodiment of the present invention.
Detailed Description
As shown in fig. 1-5, the invention discloses a load measuring device used under high temperature condition, comprising a measuring element, a measuring bridge and a load transmission rod 1, wherein the measuring bridge converts the data obtained by the action of the measuring element on the load transmission rod 1 into a load value, and further comprising a measuring chamber 2, a temperature compensation circuit and a physical cooling mechanism, one end of the load transmission rod 1 is a linkage end 11 which is in linkage fit with the measured member, the other end is a measuring end 12 which extends into the measuring chamber and can rotate and move axially relative to the measuring chamber 2, the measuring element comprises an elastic member 3 and a resistance strain gauge 31, the elastic member 3 is fixed between the measuring end 12 and the measuring chamber 2, the resistance strain gauge 31 is arranged on each elastic member 3, when the load transmission rod 1 rotates circumferentially or moves axially relative to the measuring chamber 2, the resistance strain gauge 31 transforms the deformation of the elastic member 3 into resistance data, the temperature compensation circuit transmits the temperature to the measuring bridge, the physical cooling mechanism is arranged in the measuring chamber 2 to cool the measuring element through contact conduction, in order to control the influence of the temperature on the measuring element, the scheme respectively plays roles in two modes of physical compensation and electrical compensation, the temperature of the measuring element is ensured to be maintained in a low and stable state, the physical cooling mechanism takes away the heat of the measuring element through a contact heat exchange mode, the temperature compensation circuit pre-corrects the data obtained by the resistance strain gauge 31 according to the actual temperature value through the electrical compensation mode and then transmits the data to the measuring bridge, the two modes are combined to greatly improve the accurate value of the obtained load value, in addition, the elastic part 3 fixed between the measuring end 12 and the measuring chamber 2 is selected to be matched with the measuring element formed by the resistance strain gauge 31 to enlarge the deformation amplitude for detection when the load transmission rod 1 acts, in the specific implementation of the invention, as shown in fig. 3, the measuring bridge is a resistance measuring bridge for measuring resistance change caused by resistance strain according to the wheatstone bridge principle, and is a general circuit which has a simple structure, is accurate and reliable, and is suitable for temperature compensation of a sensitive element with large temperature value drift, as shown in fig. 4, the temperature compensation circuit is a compensation circuit formed by a thermistor according to the temperature change characteristic, is a general circuit, and is commonly used in a bridge compensation method.
The number of the elastic parts 3 is at least two, the elastic parts are respectively arranged on the periphery of the load transmission rod 1, the physical cooling mechanism comprises a cooling channel 4 and a communication channel 13, the cooling channel 4 is arranged in the elastic part 3, one end of the cooling channel 4 extends to the outer side of the measuring chamber 2, the other end of the cooling channel extends to the load transmission rod 1, the cooling channel 4 of at least one elastic part 3 is used as a cooling inlet channel for the entering of a coolant, the cooling channel 4 of at least one elastic part 3 is used as a cooling outlet channel for the outflow of the coolant, the communication channel 13 is arranged in the load transmission rod 1 and is used for communicating the cooling inlet channel with the cooling outlet channel, the elastic part 3 is selected as a circulating bridge of the coolant, the structure is reasonably utilized, meanwhile, the coolant exchanges heat from the inside of the elastic part 3, the cooling efficiency and the comprehensiveness are optimal, and the measuring part, avoid the produced deviation of temperature fluctuation and temperature rise, and utilize load transmission pole 1 as the "transfer station" of coolant rationally, carry out the UNICOM with cooling channel 4 of each elastic component 3, the coolant of input can be exported fast, the structure is simplified greatly, realize passing through fast and the circulation of coolant, further improve cooling efficiency, also be the cooling to load transmission pole 1 simultaneously, avoid external heat to produce the influence from load transmission pole 1 transmission to elastic component 3, many-sided combination guarantees the stability of temperature, the arrow that does not have the alphabet in figure 1 is coolant sign coolant flow direction for the coolant, in addition, the tip that cooling channel 4 is located the measuring chamber 2 outside is provided with threaded pipe interface 41.
The coolant is R11 coolant or R113 coolant or R114 coolant or R21 coolant, and because the application environment is in a high-temperature and low-pressure state, the performance is better by selecting the above coolants.
The load transmission rod 1 is composed of a loop bar 14 and a core bar 15, the loop bar 14 and the core bar 15 are coaxially arranged and are provided with an insertion cavity 16 for inserting the core bar 15, a linkage pin 17 enabling the loop bar 14 and the core bar 15 to synchronously act is arranged between the loop bar 14 and the core bar 15 in a penetrating way, the end part of the core bar 15 corresponding to a linkage end 11 extends out of the loop bar 14 and is in linkage fit with a measured member, an elastic part 3 is fixed on the periphery of the end part of the loop bar 14 corresponding to a measuring end 12, the other end of the core bar 15 in linkage fit with the measured member is provided with a limiting disc 151 in abutting fit with the end surface of the loop bar 14, the load transmission rod 1 is divided into two parts of the loop bar 14 and the core bar 15, one end of the core bar 15 is in abutting fit with the end surface of the loop bar 14 through the limiting disc 151, the other end is in linkage fit with the measured member, the two parts have better installation stability when the measured, the operation is more convenient.
The measuring chamber 2 is provided with a disassembly and assembly port 21 and an end cover 22 for sealing the disassembly and assembly port 21, the disassembly and assembly port 21 is used for a worker to press the limiting disc 151 to draw the core rod 15 out of the loop bar 14, the disassembly and assembly port 21 is used for the worker to press the limiting disc 151 to draw the core rod 15 out of the loop bar 14 relative to the other end of the measured component, and the disassembly and assembly convenience is improved.
The core rod 15 comprises a flow dividing part 151 and a converging part 152, the cross section of the flow dividing part 151 is cross-shaped, the flow dividing part 151 and the inner wall of the insertion cavity 16 respectively form four flow dividing channels 131 communicated with different cooling channels 4, the cross section of the converging part 152 is circular, the converging part 152 and the inner wall of the insertion cavity 16 form a converging channel 132 communicated with the different flow dividing channels 131, the flow dividing channels 131 and the converging channel 132 are combined to form a communicating channel 13, the structure is optimized, the communicating channel 13 for circulating the coolant is automatically formed when the core rod 15 is inserted into the loop bar 14, the processing structure is simplified, and the insertion cavity 16 is in a complete cylindrical shape when the core rod 15 is pulled out of the loop bar 14, so that the cleaning is convenient.
The measuring chamber 2 is arranged in a sealing manner, impurities are prevented from entering the measuring chamber 2 through the sealed measuring chamber 2 to pollute the measuring environment in the measuring chamber 2, and in the specific embodiment of the invention, the sealing rings 23 are arranged at the positions of the dismounting opening 21 and the end cover 22 and in the measuring chamber 2 to ensure the sealing performance.
The side face of each elastic part 3 with deformation is surrounded by a plurality of resistance strain gauges 31 to form a resistance strain gauge 31 group, the deformation of each part of the resistance strain gauge 31 forming the resistance strain gauge 31 group can be detected constantly, the obtained data is more accurate and comprehensive, and in addition, the resistance strain gauges 31 which are surrounded and arranged can be synchronously cooled by the coolant of the cooling channel 4, so that the working states of the resistance strain gauges 31 are synchronous.
The quantity of elastic component 3 is four to arrange in load transmission pole 1 periphery along 1 circumference equidistance of load transmission pole, the preferred four of elastic component 3's quantity, and 1 circumference equidistance of load transmission pole arrange in 1 periphery of load transmission pole, the structure is better when guaranteeing measurement accuracy, can effectively eliminate under the condition that load transmission pole 1 and loading device's movable rod is not centering or the sample terminal surface is not parallel in the tensile experiment, the influence of horizontal component to measuring result when measuring axial load.
The load measuring device works as follows: the detected component is in linkage fit with the load transmission rod through mechanical linkage, the load transmission rod is driven to synchronously act when the detected component acts, the generated axial force and the generated rotation moment deform the resistance strain gauge through the elastic piece when the load transmission rod transmits, an electric signal proportional to the load is generated and then amplified and recorded through the signal amplifier, the data of the electric signal passing through the part is pre-corrected, and then the electric signal is transmitted to the measuring bridge to obtain actual data.
Claims (8)
1. A load measuring device used under high temperature conditions comprises a measuring element, a measuring bridge and a load transmission rod, wherein the measuring bridge obtains a load value according to data conversion obtained by the action of the measuring element on the load transmission rod, and the load measuring device is characterized in that: the device comprises a load transmission rod, a measuring chamber, a temperature compensation circuit and a physical cooling mechanism, wherein one end of the load transmission rod is a linkage end and is in linkage fit with a measured component, the other end of the load transmission rod is used as a measuring end and extends into the measuring chamber and can rotate in the circumferential direction and move in the axial direction relative to the measuring chamber, the measuring element comprises an elastic part and a resistance strain gauge, the elastic part is fixed between the measuring end and the measuring chamber, the resistance strain gauge is installed on each elastic part, when the load transmission rod rotates in the circumferential direction or moves in the axial direction relative to the measuring chamber, the resistance strain gauge converts the deformation of the elastic part into resistance data which is transmitted to a measuring bridge through the temperature compensation circuit, the physical cooling mechanism is arranged in the measuring chamber and cools the measuring element through contact conduction, the number of the elastic parts is at least two, the elastic parts are respectively arranged on the periphery of the load transmission rod, and the physical, cooling channel set up in the elastic component, one end extends to the measurement outdoor side, and the other end extends to load transmission pole, at least one the cooling channel of elastic component one as the cooling admission passage that supplies the coolant to get into, at least one the cooling channel of elastic component as the cooling outflow passageway that supplies the coolant to flow out, the UNICOM passageway set up in load transmission pole to carry out the UNICOM with cooling admission passage and cooling outflow passageway.
2. The load measuring device for high temperature conditions according to claim 1, wherein: the coolant is R11 coolant, R113 coolant, R114 coolant or R21 coolant.
3. The load measuring device for high temperature conditions according to claim 1, wherein: the load transmission rod is composed of a loop bar and a core bar, the loop bar and the core bar are coaxially arranged and are provided with insertion cavities for the core bar to be inserted, a linkage pin enabling the loop bar and the core bar to synchronously act penetrates through the loop bar and the core bar, the end part of the core bar corresponding to the linkage end extends out of the loop bar and is in linkage fit with a measured member, the elastic part is fixed on the periphery of the end part of the loop bar corresponding to the measuring end, and the other end of the core bar in linkage fit with the measured member is provided with a limiting disc in butt fit with the end face of the loop bar.
4. The load measuring device for high temperature conditions according to claim 1, wherein: the measuring chamber is provided with a disassembly and assembly port and an end cover for sealing the disassembly and assembly port, and the disassembly and assembly port is used for a worker to press the limiting disc to draw the core rod out of the loop bar.
5. The load measuring device for high temperature conditions according to claim 4, wherein: the core bar include reposition of redundant personnel portion and portion of converging, the cross-section of reposition of redundant personnel portion be the cross, reposition of redundant personnel portion with insert the intracavity inner wall and form four shunt passageways with different cooling channel UNICOMs respectively, the cross-section of portion of converging be circular, the portion of converging with insert the intracavity inner wall and form the passageway of converging that supplies different shunt passageways UNICOMs, shunt passageway and the passageway combination of converging constitute the UNICOM passageway.
6. The load measuring device for high temperature conditions according to claim 1, wherein: the measuring chamber is arranged in a sealing way.
7. The load measuring device for high temperature conditions according to claim 1, wherein: and a plurality of resistance strain gauges are arranged on the deformed side surface of each elastic piece in a surrounding manner to form a resistance strain gauge group.
8. The load measuring device for high temperature conditions according to claim 1, wherein: the quantity of elastic component be four to arrange in load transmission pole periphery equidistance along load transmission pole circumference.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810709651.6A CN108981984B (en) | 2018-07-02 | 2018-07-02 | Load measuring device for high-temperature conditions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810709651.6A CN108981984B (en) | 2018-07-02 | 2018-07-02 | Load measuring device for high-temperature conditions |
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| CN108981984A CN108981984A (en) | 2018-12-11 |
| CN108981984B true CN108981984B (en) | 2020-12-29 |
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| CN111795056B (en) * | 2020-07-04 | 2021-11-09 | 浙江天力机车部件有限公司 | Bolt |
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| CN101038220A (en) * | 2006-02-17 | 2007-09-19 | 罗伯特·博世有限公司 | Force sensor and manufacturing method for a force sensor |
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| CN108981984A (en) | 2018-12-11 |
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