CN203534737U - Temperature sensor-based testing device for hollow inclusion stress gauges - Google Patents
Temperature sensor-based testing device for hollow inclusion stress gauges Download PDFInfo
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- CN203534737U CN203534737U CN201320397151.6U CN201320397151U CN203534737U CN 203534737 U CN203534737 U CN 203534737U CN 201320397151 U CN201320397151 U CN 201320397151U CN 203534737 U CN203534737 U CN 203534737U
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- temperature sensor
- resistance strain
- strain gage
- plastic tube
- taseometer
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Abstract
The utility model relates to a temperature sensor-based testing device for hollow inclusion stress gauges, and aims to effectively solve the problem of the accurate stress measurement. According to the technical scheme of the utility model, a temperature sensor is adopted for carrying out the temperature compensation so as to make up the measurement error caused by the temperature change. The device structurally comprises a shell made of glass fiber reinforced plastics. The shell is composed of two parts, namely a shell body and a plug. The inner surface of the shell body is sleeved with an inner-layer PVC plastic tube. The outer surface of the inner-layer PVC plastic tube is adhered with a resistance strain gage. The outside of the resistance strain gage is surrounded by epoxy resin poured by means of a PVC tube, wherein the outer surface of the PVC tube is provided with four small circular holes. A temperature sensor DS18B20 is arranged in the groove of the shell body. The shell body is externally connected with a peripheral circuit display module connected by a single-chip microcomputer. The temperature sensor-based testing device for hollow inclusion stress gauges is novel in structure and low in cost. By means of the device, the ground stress can be measured accurately at a mining construction site. Meanwhile, the occurrence of safety accidents caused by the stress of primary rocks during the engineering construction can be avoided. The device also provides a reliable support for the supporting design of mines.
Description
Technical field
The utility model relates to a kind of terrestrial stress proving installation, particularly a kind of test unit based on temperature sensor hollow inclusion taseometer.
Background technology
Terrestrial stress is the natural stress that is not subject to Engineering Disturbance being present in stratum, it can cause country rock and supporting in mining engineering distortion and destruction, produce mine motive force phenomenon, do not consider that the impact of terrestrial stress constructs, mine is produced and can not normally be carried out, and often causes major accident.Therefore, geostress survey is accurately that safety in production institute is indispensable.The hollow inclusion taseometer based on trepanning stress relief method is the most still applied in geostress survey at present, it is the mid-1970s by Australian scholar Wo Luote Thessaloniki (G.Worotnicki) and Wal (R.Wlton) utility model of pausing, China's application now more widely KX-81 type hollow inclusion strainometer is developed on its basis, the hollow cylinder of its main body for making with epoxy resin, external diameter is 36mm, internal diameter is 30mm, interbed diameter 32mm place therein, along same circumference is equidistant, be embedded into 3 groups of resistance strain gages, every group of strain rosette is comprised of 4 foil gauges, apart from one another by 45 degree.Its shell is made by aluminium alloy, because aluminium alloy easily occurs the problems such as shrinkage cavity, sand holes, pore and slag inclusion in producing casting process, price is relatively also expensive, again because the hardness of material own is superpower, the shell mechanism of hollow inclusion taseometer is more complicated again, on numerically controlled lathe, processing is difficult for, and therefore to processing technology, requires higher.It is to use resistance strain gage as sensing element, so its meeting is because temperature variation cause measuring error, causes Instrument measuring precision low.In addition, due to the complex structure of hollow inclusion taseometer own with resistance strain gage is smaller, feature such as lead-in wire frangibility etc., this has just determined the complicacy of the processing technologys such as cast of strain gauge adhesion, epoxy resin in its manufacture process.Therefore, the relevant knowledge of the subjects such as application machine manufacture, Circuit theory, develop a kind of sheathing material low price, handling ease, the terrestrial stress test macro that effect temperature compensation is good, measuring accuracy is high, finds a kind of manufacture method of manufacturing process simple possible imperative.
Summary of the invention
For above-mentioned situation, for overcoming the defect of prior art, the object of the utility model is just to provide a kind of test unit of the hollow inclusion taseometer based on temperature sensor, can effectively solve the error that temperature variation causes, shell mechanism processing is difficult for, the problem of complex manufacturing technology, improves the precision of measuring.
The technical scheme that the utility model solves is to comprise shell mechanism, resistance strain gage, temperature sensor, PVC plastic tube, epoxy resin.Described shell mechanism has glass-reinforced plastic material to process on numerically controlled lathe, shell mechanism comprises housing (as shown in Figure 2) and embolism (as shown in Figure 3) two parts, its middle shell afterbody has leader cable outlet 10 and bolt pin 1, O-ring seal 9, front end has overcoat annulus 13, surface of shell 3 covers have internal layer PVC plastic tube 6, internal layer PVC outer tube surface posts resistance strain gage 4, the outside of resistance strain gage 4 is surrounded by epoxy resin 7, the lead-in wire of resistance strain gage 4 extracts by cable outlet 2, the groove of housing has temperature sensor 11, embolism front end has O-ring seal 9, inner chamber afterbody has pilot hole 12, front end has jointing compound tap hole 8.In addition, the outer PVC plastic tube (as shown in Figure 6) that also has casting epoxy resin to use, there are 4 small sircle holes on its surface.
The utility model measuring accuracy is high, effective, can provide terrestrial stress data more accurately and reliably for design and the construction of mine, railway, water conservancy and hydropower, civil construction and other Large Undergrounds or open-air work, under economic and effective prerequisite, for the safety in production promoting in engineering construction, there is significant role.
Accompanying drawing explanation
Fig. 1 is structural drawing of the present utility model.
Fig. 2 is housing figure of the present utility model.
Fig. 3 is embolism figure of the present utility model.
Fig. 4 is temperature sensor connection diagram of the present utility model.
Fig. 5 is internal layer PVC plastic tube of the present utility model.
Fig. 6 is outer PVC plastic tube of the present utility model.
Fig. 7 is overcoat annulus of the present utility model.
Fig. 8 is inner chamber xsect of the present utility model.
Fig. 9 is resistance strain gage connection diagram of the present utility model.
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.
As shown in Figure 1, the utility model comprises shell mechanism, resistance strain gage, temperature sensor, PVC plastic tube, epoxy resin.
Described shell mechanism has glass-reinforced plastic material to process on numerically controlled lathe, shell mechanism comprises housing and embolism two parts, its middle shell afterbody has leader cable outlet 10 and bolt pin 1, O-ring seal 9, front end has overcoat annulus 13, shell inner surface 3 covers have internal layer PVC plastic tube 6, the sub-outside surface of internal layer pvc pipe posts resistance strain gage 4, the outside of resistance strain gage 4 is surrounded by epoxy resin 7, the lead-in wire of resistance strain gage 4 extracts by cable outlet 2, the groove of housing has temperature sensor 11, embolism front end has O-ring seal 9, inner chamber afterbody has pilot hole 12, front end has jointing compound tap hole 8, in addition the outer PVC plastic tube that also has casting epoxy resin to use, there are 4 small sircle holes on its surface.
Said temperature sensor 11, that used is temperature sensor DS18B20, it has 3 pins, be respectively earth terminal GND, digital signal input end DQ, power supply input end VCC, three cable tails connect respectively three pins, exit connects respectively 5v power supply, ground connection, connects digital signal input port, and it is by monolithic processor controlled peripheral circuit display module.
Described shell mechanism is processed on numerically controlled lathe by glass-reinforced plastic material, housing afterbody has leader cable outlet 10 and bolt pin 1, O-ring seal 9, the sub-outside surface of internal layer pvc pipe posts resistance strain gage 4, the outside of resistance strain gage 4 is surrounded by epoxy resin 7, the lead-in wire of resistance strain gage 4 extracts by cable outlet 2, embolism front end has O-ring seal 9, and inner chamber afterbody has pilot hole 12, front end to have jointing compound tap hole 8.
Described internal layer PVC plastic tube 6, it is the pipe of being made by Corvic, and internal diameter is 29mm, and external diameter is 32mm, and length is 94mm.
Described overcoat annulus 13, it is also the annulus of being made by Corvic, and internal diameter is 32mm, and external diameter is 36mm, and length is 2mm.
Said outer PVC plastic tube, it is also the annulus that has Corvic to make, and internal diameter is 36mm, and external diameter is 40mm, and length is 94mm, outside surface has the small sircle hole of 4 diameter 3mm.
By above-mentioned, can be found out, shell mechanism of the present utility model is according to certain planform and dimensioned, to be formed on numerically controlled lathe by glass-reinforced plastic material, comprises housing and embolism two parts.After shell mechanism processes, on the outside surface of housing, cover has internal layer PVC plastic tube 6, it is the pipe of being made by Corvic, its size is that internal diameter is 29mm, external diameter is 32mm, length is 94mm, 3 groups of strain rosettes are posted on internal layer PVC plastic tube 6 surfaces, the connecting line construction of resistance strain gage as shown in Figure 5, the outside of resistance strain gage by the epoxy resin of thick about 2mm around, housing front portion has overcoat annulus 13 keeping off, prevent that epoxide-resin glue from flowing out, it is also the annulus of being made by Corvic, its size is that internal diameter is 32mm, external diameter is 36mm, length is 2mm, in the groove of housing, be mounted with 11 temperature sensor DS18B20, its 3 pins connect respectively 5v power supply, ground connection, connect digital signal input port, be externally connected to monolithic processor controlled display device, its line signal as shown in Figure 4, the aperture 2 that has 16 diameter 1mm in housing groove, 13 lead-in wires of resistance strain gage and 3 lead-in wires of temperature sensor can be drawn by aperture 2, embolism front end and housing afterbody are equipped with O-ring seal 9, outflow and the moisture that can prevent jointing compound in use procedure enter in instrument, embolism afterbody and housing front end have diameter 2mm aperture 8, the accurate position relationship of positioning housing and embolism.Outer PVC plastic tube used, it is also the hollow ring that has Corvic to make, internal diameter is 36mm, external diameter is 40mm, length is 94mm, and outside surface has the small sircle hole of 4 diameter 3mm, as shown in Figure 6, be for quickly and accurately to injection ring epoxy resins in cavity, improved the processing technology of processing.
The utility model apparatus structure is novel, outward appearance is unique, on the basis of traditional hollow inclusion taseometer, the test unit of the hollow inclusion taseometer based on temperature sensor that further develops and come, its effect temperature compensation is good, precision is high, its sheathing material fiberglass low price, handling ease of while, the processing technology of adhering resistance strain sheets, casting epoxy resin is fairly simple, convenient, measurement terrestrial stress that can be more accurate, prevents the security incident causing due to the initial stress in engineering construction.
The utility model is in order to reach result of use, when making, sheathing material will process with glass-reinforced plastic material on numerically controlled lathe, reason is that the hardness of aluminum alloy materials own is superpower, shell mechanism more complicated again, manufacturing procedure more complicated on numerically controlled lathe, and easily there is shrinkage cavity in aluminum alloy materials in producing casting process, trachoma, the defect such as pore and slag inclusion, add that aluminum alloy materials itself is more expensive, and glass-reinforced plastic material belongs to organic substance, hardness is more intense, can bear rock pressurized, easy to process on numerically controlled lathe, less demanding to cutter, it is cheap that the relative aluminium alloy of price is wanted, so it is more rational that sheathing material adopts fiberglass.Resistance strain gage should be attached to the outside surface of internal layer PVC plastic pipe 6, because it is to be synthesized by Corvic for PVC material, its elastic-plastic ratio is better, the working environment that is applicable to resistance strain gage, makes remolding sensitivity better, then must clean with alcohol the outside surface of internal layer PVC plastic tube before pasting, make it clean, clean, post after foil gauge, oxidized in order to prevent it, also should be coated with last layer paraffin at its outside surface.Use outer PVC plastic pipe, it is enclosed within the outside of internal layer PVC plastic pipe 6, on its outside surface, there are four apertures, by aperture can with needle tubing simply, easily and quickly to its inside cavity casting epoxy resin, in order to pour into a mould evenly, turne tube that should be suitable, the front end sleeve of internal layer PVC plastic pipe 6 has an annulus simultaneously, can prevent the outflow of epoxy resin.In order to prevent that outflow and the moisture of jointing compound in use procedure from entering into inside, in embolism front portion and housing afterbody, must load onto O-ring seal.For attached cable lead-in wire, the housing afterbody bolt pin of must screwing on.
The making step of the utility model type is: (1) is on numerically controlled lathe, with fiberglass rod materials processing, become shell (2) to put internal layer PVC plastic pipe 6 at the outside surface of housing, after cleaning with alcohol, stick resistance strain gage, at foil gauge outside surface, be coated with in the groove of last layer paraffin (3) at housing and load onto temperature sensor DS18B20, lead-in wire is drawn, lead-in wire is connected with monolithic processor controlled display device (4) lead-in wire of temperature sensor is coupled together according to Fig. 2, by the lead-in wire of resistance strain gage, according to Fig. 7 couple together (5) at the outside surface of internal layer PVC plastic tube 6, put outer PVC plastic tube, and on front end sleeve overcoat annulus 13(6) aperture with needle tubing by outer PVC plastic tube is to injection ring epoxy resins in inner chamber, and turne tube ceaselessly, until after epoxy resin cure, take out outer PVC plastic tube and can (7) load onto bolt pin at housing afterbody, in housing afterbody and embolism front end groove, load onto O-ring seal.
The principle of work of the utility model type is: the object of the utility model type is to measure the initial stress based on stress relieving method, instructs in engineering and keeps the safety in production.The utility model utilizes resistance strain gage as sensitive element, and the variation that the power of experiencing by handle is converted to resistance shows, and comprises 3 groups of resistance strain gages, and every group of strain rosette is comprised of four foil gauges, and space 45 degree are arranged, and connection line as shown in Figure 9.What it used is the principle of Wheatstone bridge, resistance strain gage is as 1/4th brachium pontis, only has a resistance strain gage as active gage at every turn, the resistance of other 3/4ths brachium pontis of electric bridge all adopts the resistance of ultralow temperature coefficient, they are very little with the variation of the change resistance of temperature, on almost not impact of measurement result.The value of the initial stress can reflect by resistance strain gage like this, but meanwhile, by the variation of temperature, also can cause the variation of resistance strain gage resistance.Therefore, the utility model is provided with temperature sensor DS18B20 in the groove of housing, and it is a kind of digital temperature sensor, and the variation of energy Real-Time Monitoring ambient temperature, can directly read temperature registration.Temperature sensor DS18B20 has 3 pins, earth terminal GND, meets power supply VCC, digital signal input end DQ, and these 3 pins have respectively cable to draw, and is externally connected to the monolithic processor controlled display section of self-developing design, and circuit diagram connection as shown in Figure 4.The strain value of a resistance strain gage of every like this record, the while is also recorded the reading of temperature sensor DS18B20.Until after outcome record is complete, take out core, core is put into alternating temperature case, regulate the temperature value of alternating temperature case, core temperature around can change, and resistance-strain sector-meeting is simultaneously because of the variation of temperature, and strain value also changes accordingly, the variation of the strain value being caused by the variation of temperature so just can be obtained, and finally by demarcating, can obtain the strain value of resistance strain gage accurately.
The course of work of the present utility model is: after completing the utility model type according to correct making step, will use the utility model type to measure terrestrial stress according to correct method, method be as follows.
(1) after choosing test point according to the requirement of choosing terrestrial stress test point, use is furnished with the geological drilling rig of drilling rod and special core sleeve and drill bit, in surveyed wall, beat the horizontal drilling that diameter is 130mm, to 3-5 times of depths of tunnel span, to guarantee that strainometer installation site is positioned at initial stress area.Boring updip 3 degree, to 5 degree, are holed so that cold water flows out and is easy to clean.
(2) with flat drill head, polish at the bottom of by hole, and get hydraucone with taper bit, then at the bottom of hole, beat the concentric aperture that diameter is 36mm, the dark 35-40cm of aperture, after aperture is accomplished fluently, water is rinsed well, then cleans with alcohol.
(3) then start to install the utility model type.With cementing agent, inject in the inner chamber of the utility model type, fix embolism plug, use with the mounting rod of orientor the utility model type is sent into precalculated position in aperture, infer fixed pin, cementing agent is extruded the interval entering between taseometer and aperture from taseometer inner chamber, by the time after adhesive cures, write down the drift angle of taseometer and the orientation of boring and inclination angle.
(4) until after jointing compound solidifies, start to carry out stress relieving test.With rig, start to overlap the heart, every drilling depth 3cm records the reading of instrument, records the temperature value of temperature sensor DS18B20 simultaneously, when instrument readings no longer changes after drilling depth by the time, stops drilling depth, takes out core.
(5) core of taking-up is put in alternating temperature case, regulate the temperature value of alternating temperature case, record the variation of the strain value that resistance strain gage causes by temperature variation, by demarcating the change of the strain value that just can obtain being caused by temperature, measure like this, the strain value recording during by this change amount and previously stress relieving compares, and can obtain strain value accurately.Bring strain value into data software for calculation and calculate, just can obtain terrestrial stress accurately.
Claims (6)
1. a test unit for the hollow inclusion taseometer based on temperature sensor, comprises shell mechanism, resistance strain gage, temperature sensor, PVC plastic tube, epoxy resin, described shell mechanism has glass-reinforced plastic material to process on numerically controlled lathe, shell mechanism comprises housing and embolism two parts, its middle shell afterbody has leader cable outlet (10) and bolt pin (1), O-ring seal (9), front end has overcoat annulus (13), shell inner surface 3 covers have internal layer PVC plastic tube (6), the sub-outside surface of internal layer pvc pipe posts resistance strain gage (4), the outside of resistance strain gage (4) is surrounded by epoxy resin (7), the lead-in wire of resistance strain gage (4) extracts by cable outlet (2), the groove of housing has temperature sensor (11), embolism front end has O-ring seal (9), inner chamber afterbody has pilot hole (12), front end has jointing compound tap hole (8), in addition the outer PVC plastic tube that also has casting epoxy resin to use, there are 4 small sircle holes on its surface.
2. the test unit of the hollow inclusion taseometer based on temperature sensor according to claim 1, it is characterized in that, said temperature sensor (11), that used is temperature sensor DS18B20, it has 3 pins, is respectively earth terminal GND, digital signal input end DQ, power supply input end VCC, and three cable tails connect respectively three pins, exit connects respectively 5v power supply, ground connection, connects digital signal input port, and it is by monolithic processor controlled peripheral circuit display module.
3. the test unit of the hollow inclusion taseometer based on temperature sensor according to claim 1, it is characterized in that, described shell mechanism is processed on numerically controlled lathe by glass-reinforced plastic material, housing afterbody has leader cable outlet (10) and bolt pin (1), O-ring seal (9), the sub-outside surface of internal layer pvc pipe posts resistance strain gage (4), the outside of resistance strain gage 4 is surrounded by epoxy resin 7, the lead-in wire of resistance strain gage (4) extracts by cable outlet (2), embolism front end has O-ring seal (9), inner chamber afterbody has pilot hole (12), front end has jointing compound tap hole (8).
4. the test unit of the hollow inclusion taseometer based on temperature sensor according to claim 3, is characterized in that, described internal layer PVC plastic tube (6), it is the pipe of being made by Corvic, internal diameter is 29mm, and external diameter is 32mm, and length is 94mm.
5. the test unit of the hollow inclusion taseometer based on temperature sensor according to claim 3, is characterized in that, described overcoat annulus 13, and it is also the annulus of being made by Corvic, and internal diameter is 32mm, and external diameter is 36mm, and length is 2mm.
6. the test unit of the hollow inclusion taseometer based on temperature sensor according to claim 3, it is characterized in that, said outer PVC plastic tube, it is also the annulus that has Corvic to make, internal diameter is 36mm, external diameter is 40mm, and length is 94mm, and outside surface has the small sircle hole of 4 diameter 3mm.
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| CN201320397151.6U CN203534737U (en) | 2013-07-05 | 2013-07-05 | Temperature sensor-based testing device for hollow inclusion stress gauges |
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| CN201320397151.6U CN203534737U (en) | 2013-07-05 | 2013-07-05 | Temperature sensor-based testing device for hollow inclusion stress gauges |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390734A (en) * | 2014-12-02 | 2015-03-04 | 安徽恒源煤电股份有限公司 | Hollow inclusion stressometer |
| CN104864838A (en) * | 2015-06-14 | 2015-08-26 | 安徽圣力达电器有限公司 | Novel strain meter |
| CN104897113A (en) * | 2014-10-05 | 2015-09-09 | 安徽贝莱电子科技有限公司 | Strain gauge |
| CN104897324A (en) * | 2014-10-05 | 2015-09-09 | 安徽贝莱电子科技有限公司 | Concrete strain gauge |
| CN104897112A (en) * | 2014-10-05 | 2015-09-09 | 安徽贝莱电子科技有限公司 | Novel concrete strain gauge |
| CN104897111A (en) * | 2014-10-05 | 2015-09-09 | 安徽贝莱电子科技有限公司 | Embedded type strain gauge |
| CN104897323A (en) * | 2014-10-05 | 2015-09-09 | 安徽贝莱电子科技有限公司 | Novel strain gauge |
| CN105136357A (en) * | 2015-09-29 | 2015-12-09 | 中国地质科学院地质力学研究所 | Foil gauge measure circuit and hollow inclusion strain gauge measurement system |
| CN105424238A (en) * | 2015-12-08 | 2016-03-23 | 北京金风科创风电设备有限公司 | Stress strain sensor |
| CN105606263A (en) * | 2016-01-14 | 2016-05-25 | 北京至感传感器技术研究院有限公司 | Triaxial stress gauge |
| CN106979004A (en) * | 2017-05-16 | 2017-07-25 | 中国地质科学院地质力学研究所 | A kind of boring observation instrument and its installation method |
| CN108414129A (en) * | 2018-04-02 | 2018-08-17 | 长江水利委员会长江科学院 | The direct patch crustal stress of half backpack body releases test device and method |
| CN110595657A (en) * | 2019-09-23 | 2019-12-20 | 煤炭科学技术研究院有限公司 | Small-aperture 16-component conical strain gauge |
| CN115420251A (en) * | 2022-11-02 | 2022-12-02 | 煤炭科学研究总院有限公司 | Twelve-component small-aperture hole bottom strain gauge |
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2013
- 2013-07-05 CN CN201320397151.6U patent/CN203534737U/en not_active Expired - Fee Related
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897113A (en) * | 2014-10-05 | 2015-09-09 | 安徽贝莱电子科技有限公司 | Strain gauge |
| CN104897324A (en) * | 2014-10-05 | 2015-09-09 | 安徽贝莱电子科技有限公司 | Concrete strain gauge |
| CN104897112A (en) * | 2014-10-05 | 2015-09-09 | 安徽贝莱电子科技有限公司 | Novel concrete strain gauge |
| CN104897111A (en) * | 2014-10-05 | 2015-09-09 | 安徽贝莱电子科技有限公司 | Embedded type strain gauge |
| CN104897323A (en) * | 2014-10-05 | 2015-09-09 | 安徽贝莱电子科技有限公司 | Novel strain gauge |
| CN104390734A (en) * | 2014-12-02 | 2015-03-04 | 安徽恒源煤电股份有限公司 | Hollow inclusion stressometer |
| CN104864838A (en) * | 2015-06-14 | 2015-08-26 | 安徽圣力达电器有限公司 | Novel strain meter |
| CN105136357B (en) * | 2015-09-29 | 2017-11-17 | 中国地质科学院地质力学研究所 | A kind of foil gauge measuring circuit and hollow inclusion strain gauge measuring system |
| CN105136357A (en) * | 2015-09-29 | 2015-12-09 | 中国地质科学院地质力学研究所 | Foil gauge measure circuit and hollow inclusion strain gauge measurement system |
| CN105424238A (en) * | 2015-12-08 | 2016-03-23 | 北京金风科创风电设备有限公司 | Stress strain sensor |
| CN105606263A (en) * | 2016-01-14 | 2016-05-25 | 北京至感传感器技术研究院有限公司 | Triaxial stress gauge |
| CN106979004A (en) * | 2017-05-16 | 2017-07-25 | 中国地质科学院地质力学研究所 | A kind of boring observation instrument and its installation method |
| CN108414129A (en) * | 2018-04-02 | 2018-08-17 | 长江水利委员会长江科学院 | The direct patch crustal stress of half backpack body releases test device and method |
| CN108414129B (en) * | 2018-04-02 | 2023-07-14 | 长江水利委员会长江科学院 | Device and method for testing relief of direct patch ground stress of semi-enclosure |
| CN110595657A (en) * | 2019-09-23 | 2019-12-20 | 煤炭科学技术研究院有限公司 | Small-aperture 16-component conical strain gauge |
| CN115420251A (en) * | 2022-11-02 | 2022-12-02 | 煤炭科学研究总院有限公司 | Twelve-component small-aperture hole bottom strain gauge |
| CN115420251B (en) * | 2022-11-02 | 2023-01-31 | 煤炭科学研究总院有限公司 | Twelve-component small-aperture hole bottom strain gauge |
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| C14 | Grant of patent or utility model | ||
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