CN214843000U - Microwave rock volume change measuring system - Google Patents
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- CN214843000U CN214843000U CN202023079421.8U CN202023079421U CN214843000U CN 214843000 U CN214843000 U CN 214843000U CN 202023079421 U CN202023079421 U CN 202023079421U CN 214843000 U CN214843000 U CN 214843000U
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Abstract
The utility model provides a microwave rock volume change measuring system, which comprises a test cavity, a microwave control device, a strain measuring device, a measuring circuit and a resistance strain gauge; the test cavity is of a sealed cavity structure, and a rock test piece is placed in the test cavity; the microwave control device is arranged in the test cavity; the strain measuring device comprises a circumferential strain gauge and an axial strain gauge, and is attached to the surface of the rock test piece; the measuring circuit is connected with a plurality of strain measuring devices through leads, and the resistance strain gauge is connected with the measuring circuit. After the microwave emitted by the microwave control device acts on the rock test piece, data acquisition is carried out on the rock test piece through a plurality of annular strain gauges and axial strain gauges attached to the surface of the rock test piece, and the volume change of the rock test piece can be obtained by combining a measuring circuit and a resistance strain gauge, so that the volume change of liquid or gas caused by temperature change is eliminated, and the influence of the microwave action on the volume of the rock is measured more accurately.
Description
Technical Field
The utility model relates to a rock mechanics equipment technical field relates to a rock volume changes measurement system, especially relates to a can the accurate measurement microwave effect to the measurement system of rock volume influence size.
Background
In mining of mineral resources facing deep parts of the earth surface, how to effectively break rock becomes a hot point of research. The traditional mode is mainly through utilizing the drill bit to carry out rock breaking, and this kind of original broken rock mode is limited by factors such as rock intensity is too big and the drill bit easily wears out, has problems such as inefficiency and with high costs.
In recent years, microwaves are introduced into the field of rock crushing, and the microwaves generate heat by promoting mutual friction among molecules in rocks, so that the overall temperature of an acted object is increased, the softened rock mass is convenient to crush, and the microwaves have the advantages of no secondary pollution and the like, and have proved to be technically and economically feasible in the field. Relevant researches prove that the microwave effect can greatly reduce the strength of the rock and even lead the rock to be melted and peeled, and the microwave technology has a better application prospect in the field of rock crushing.
Before applying microwaves to the field of rock breaking, the effect of microwaves on rock volume changes needs to be ascertained in the laboratory. Most of the existing rock volume change measuring methods indirectly measure the rock volume change through the volume change of liquid or gas, and considering that the rock temperature rises suddenly under the action of microwaves and the volume change of liquid or gas is affected, the rock volume measuring result in the prior art is unreliable, and a new rock volume change measuring scheme needs to be provided in the industry.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to prior art's above-mentioned defect, provide a microwave effect rock volume change measurement system, can get rid of temperature variation and the liquid or gaseous volume change that leads to, measure the microwave effect more accurately and influence the size to the rock volume.
The utility model provides a technical scheme that technical problem adopted as follows:
a microwave action rock volume change measurement system comprising:
the test cavity is of a sealed cavity structure, and a rock test piece is placed in the test cavity;
the microwave control device is arranged inside the test cavity and is used for providing microwaves acting on the rock test piece;
the strain measurement device comprises a plurality of annular strain gauges and a plurality of axial strain gauges, wherein the plurality of the annular strain gauges and the plurality of the axial strain gauges are respectively attached to the surface of the rock test piece;
the measuring circuit is connected with the plurality of strain measuring devices through leads, and the resistance strain gauge is connected with the measuring circuit.
Compared with the prior art, the technical scheme has the beneficial effects that: after the microwave emitted by the microwave control device acts on the rock test piece, data acquisition is carried out on the rock test piece through a plurality of annular strain gauges and axial strain gauges attached to the surface of the rock test piece, and the volume change of the rock test piece can be obtained by combining a measuring circuit and a resistance strain gauge, so that the volume change of liquid or gas caused by temperature change is eliminated, and the influence of the microwave action on the volume of the rock is measured more accurately.
Further, the strain measurement device comprises a sensitive grid, a substrate and a covering layer;
the sensitive grid, the substrate and the covering layer form a sheet structure, the sensitive grid is positioned between the substrate and the covering layer, and the sensitive grid is connected with the measuring circuit through a lead;
when the strain measurement device is attached to the surface of the rock test piece, the substrate is located at a position close to the rock test piece, and the covering layer is located at a position far away from the rock test piece.
The beneficial effect who adopts above-mentioned scheme is: the strain measurement device is composed of the sensitive grid, the substrate and the covering layer, the sensitive grid is arranged between the substrate and the covering layer, the substrate and the covering layer can protect the sensitive grid, and meanwhile, the improvement of the measurement precision is facilitated.
Further, the covering layer is a foamed silica layer.
The beneficial effect who adopts above-mentioned scheme is: the foamed silicon dioxide layer is used as a covering layer, so that the effects of corrosion resistance and moisture resistance can be achieved, and the sensitive grid can be prevented from being irradiated by microwaves.
Further, in the hoop strain gauge, the sensitive grids are arranged along the horizontal direction; in the axial strain gauge, the sensitive grids are arranged along a vertical direction.
The beneficial effect who adopts above-mentioned scheme is: and collecting the annular deformation data and the axial deformation data of the rock test piece, and collecting the deformation data of the rock test piece in multiple directions.
Furthermore, 3-10 annular strain gauges are arranged, and the sensitive grids among the annular strain gauges are parallel to each other;
3-10 axial strain gauges are arranged, and the sensitive grids among the axial strain gauges are parallel to each other.
The beneficial effect who adopts above-mentioned scheme is: according to the size of the rock test piece, the number of the annular strain gauges and the number of the axial strain gauges are adaptively adjusted, and the measurement precision is favorably improved.
Furthermore, the microwave control device comprises a microwave source, a waveguide component and a microwave emitting disc, wherein one end of the microwave source is connected with the waveguide component, and the other end of the microwave source is connected with the microwave emitting disc;
the test cavity consists of a bottom plate, a side plate and a top plate, a rock bearing base station is arranged on the bottom plate of the test cavity, and a rock test piece is placed on the rock bearing base station;
the microwave source is arranged on a top plate or a side panel of the test cavity, and the microwave transmitting disc transmits microwaves towards the rock test piece.
The beneficial effect who adopts above-mentioned scheme is: the bottom plate of the test cavity is provided with a rock bearing base station, the microwave source is arranged on the top plate or the side panel of the test cavity, and the relative position relation between the microwave source and the rock test piece can be adjusted according to actual conditions so as to improve the universality of the system.
Further, the microwave source includes a power supply assembly, a transformer assembly, and a control circuit.
The beneficial effect who adopts above-mentioned scheme is: the microwave source is composed of a power supply assembly, a transformer assembly and a control circuit, so that the test microwave is provided.
Furthermore, the bottom plate, the side panels and the top plate are of a plate-shaped double-layer structure consisting of a metal layer cavity and a heat insulation layer cavity;
a taking and placing through hole is formed in the side panel, and the side door is arranged on the taking and placing through hole;
the rock bearing base platform is arranged on the bottom plate through a height adjusting assembly.
The beneficial effect who adopts above-mentioned scheme is: the bottom plate, the side plate and the top plate are formed by the metal layer cavity and the heat insulation layer cavity, namely the whole test cavity is of a double-layer structure, so that the effects of better heat insulation and radiation prevention can be achieved, and the safety of the test process is ensured.
Further, the measurement circuit includes an amplifier and a bridge;
one end of the lead wire is connected with the strain measuring device, the other end of the lead wire is connected with the electric bridge through the amplifier, and the electric bridge is connected with the resistance strain gauge.
The beneficial effect who adopts above-mentioned scheme is: the electric signals collected by the strain measuring device are processed through the amplifier and the electric bridge, so that the reliability of test data is improved.
Drawings
Figure 1 is the utility model discloses a microwave effect rock volume change measurement system's whole schematic diagram.
Fig. 2 is the utility model discloses a microwave control device's in microwave effect rock volume change measurement system schematic diagram.
Fig. 3 is the utility model discloses a strain measurement device's in microwave effect rock volume change measurement system schematic diagram.
Fig. 4 is a schematic diagram of a measuring circuit in the microwave-action rock volume change measuring system of the present invention.
In the figures, the list of components represented by the various reference numbers is as follows:
the device comprises a test cavity 1, a microwave control device 2, a strain measuring device 3, a measuring circuit 4, a lead 5 and a resistance strain gauge 6;
a rock bearing base 101, a height adjusting assembly 102;
a microwave source 201, a waveguide assembly 202, a microwave launch pad 203;
the device comprises a circumferential strain gauge 301, an axial strain gauge 302, a sensitive grid 303 and a substrate 304;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or assembly referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may for example be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. When an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.
Before the microwaves can be applied to the field of rock breaking on a large scale, the effect of the microwaves on the volume change of the rock needs to be ascertained in the laboratory. Most of the existing rock volume change measuring modes indirectly measure the rock volume change through the volume change of liquid or gas, and the volume change of the liquid or gas is influenced by considering that the temperature of the rock suddenly rises under the action of microwaves, so that the rock volume measuring result in the prior art is unreliable. In brief, when the volume change of the rock is researched, the volume change of the liquid or gas at the periphery of the rock caused by the volume change of the rock is utilized to indirectly measure the volume change of the rock. For example, placing a rock specimen in a container filled with a liquid, which when the volume of the rock increases, causes a portion of the liquid in the periphery to be displaced, it is known to measure the volume change of the rock indirectly by measuring the volume of the displaced portion of the liquid. However, when the microwave acts on the rock specimen, the microwave affects the volume of the liquid, and the volume of the discharged liquid cannot accurately reflect the change of the volume of the rock, which is a limitation of the prior art. Therefore, there is a need to provide a new rock volume change measurement scheme.
As shown in figure 1, the microwave action rock volume change measuring system comprises a test cavity 1, a microwave control device 2, a strain measuring device 3, a measuring circuit 4 and a resistance strain gauge 6.
The test cavity 1 is of a sealed cavity structure, and a rock test piece is placed in the test cavity 1; the microwave control device 2 is arranged in the test cavity 1, and the microwave control device 2 is used for providing microwaves acting on the rock test piece; the strain measurement device 3 comprises a plurality of annular strain gauges 301 and a plurality of axial strain gauges 302, the annular strain gauges 301 and the axial strain gauges 302 are respectively arranged, and the plurality of strain measurement devices 3 are attached to the surface of the rock test piece; the measuring circuit 4 is connected with a plurality of strain measuring devices 3 through leads 5, and the resistance strain gauge 6 is connected with the measuring circuit 4.
The core of the utility model lies in, through a plurality of hoop strain gages 301 and a plurality of axial strain gage 302 as strain measurement device 3, the volume change of direct measurement rock test piece. A plurality of annular strain gauges 301 are arranged on the rock test piece, and a plurality of annular deformation data on the annular strain gauges are collected; meanwhile, a plurality of axial strain gauges 302 are arranged on the rock test piece, and a plurality of axial deformation data are acquired. Through a plurality of annular deformation data and a plurality of axial deformation data, the whole deformation condition of the rock test piece can be accurately reflected.
Therefore, based on the above technical scheme, after the microwave emitted by the microwave control device 2 acts on the rock test piece, data acquisition is performed on the rock test piece through the plurality of annular strain gauges 301 and the axial strain gauge 302 attached to the surface of the rock test piece, and the volume change of the rock test piece can be obtained by combining the measuring circuit 4 and the resistance strain gauge 6, so that the volume change of liquid or gas caused by temperature change is eliminated, and the influence of the microwave action on the volume of the rock is measured more accurately.
Preferably, the strain measurement device 3 comprises a sensitive grid 303, a substrate 304 and a cover layer; the sensitive grid 303, the substrate 304 and the covering layer form a sheet structure, the sensitive grid 303 is positioned between the substrate 304 and the covering layer, and the sensitive grid 303 is connected with the measuring circuit 4 through a lead 5; when the strain measuring device 3 is attached to the surface of the rock specimen, the substrate 304 is located close to the rock specimen, and the cover layer is located far from the rock specimen. The strain measurement device 3 is composed of the sensitive grid 303, the substrate 304 and the covering layer, the sensitive grid 303 is arranged between the substrate 304 and the covering layer, the substrate 304 and the covering layer can protect the sensitive grid 303, and meanwhile, the measurement accuracy is improved.
During the test, the sensitive grid 303 may be wetted or even corroded, which may lead to failure of the strain gauge 3. To avoid this problem, preferably, the cover layer is a foamed silica layer. The foamed silicon dioxide layer is used as a covering layer, so that the effects of corrosion resistance and moisture resistance can be achieved, and the sensitive grid 303 can be prevented from being irradiated by microwaves. Similarly, a foamed silica sleeve is provided outside the lead 5, and the lead 5 is protected from moisture and corrosion by the foamed silica sleeve.
Specifically, the substrate 304 is an insulating substrate 304. The sensitive grid 303 is attached to the substrate 304, and the sensitive grid 303 is used for converting the strain amount of the rock test piece into the resistance variation amount, and in the process, the substrate 304 is arranged between the sensitive grid 303 and the rock test piece and can play an insulating role. In addition, the covering layer is made of an organic polymer material, so that the sensitive grid 303 is protected from radiation damage and mechanical damage, and the covering layer has good mechanical properties. The lead 5 is communicated with the sensitive grid 303 and the measuring circuit 4, and a double-lead 5 and multipoint welding mode is adopted.
As shown in fig. 3, preferably, in the hoop strain gauge 301, the sensitive grids 303 are arranged along a horizontal direction; in the axial strain gage 302, the sensitive grids 303 are arranged in a vertical direction. The method comprises the steps of collecting circumferential deformation data of the rock test piece through the horizontally arranged sensitive grids 303, collecting axial deformation data through the vertically arranged sensitive grids 303, and collecting deformation data of the rock test piece in multiple directions. Specifically, 3-10 circumferential strain gauges 301 are provided, and the sensitive grids 303 between the circumferential strain gauges 301 are parallel to each other; 3-10 axial strain gages 302 are arranged, and the sensitive grids 303 among the axial strain gages 302 are parallel to each other. According to the size of the rock test piece, the number of the annular strain gauges 301 and the number of the axial strain gauges 302 are adjusted adaptively, and the measurement accuracy is improved.
For example, when the size of the rock specimen is 50mm in diameter and 100mm in height, 5 circumferential strain gauges 301 are provided and 5 axial strain gauges 302 are provided. Considering that the rock test piece has complex and various mineral components and internal structures and the heated volume expansion parts are possibly inconsistent, in order to keep the accuracy of measuring the volume change as much as possible and also consider the actual requirements, in the test process, the rock test piece with the diameter of 50mm and the height of 100mm is divided into five sections to respectively measure the strain of each section, a strain gauge is arranged at the midpoint of each section to measure the circumferential strain and the axial strain of the section, and the deformation of each section is approximately uniform deformation, so that the integral volume change is measured.
As shown in fig. 1 and fig. 2, the microwave control device 2 includes a microwave source 201, a waveguide assembly 202, and a microwave launching pad 203, wherein one end of the microwave source 201 is connected to the waveguide assembly 202, and the other end of the microwave source 201 is connected to the microwave launching pad 203; the test cavity 1 consists of a bottom plate, a side plate and a top plate, a rock bearing base 101 is arranged on the bottom plate of the test cavity 1, and a rock test piece is placed on the rock bearing base 101; the microwave source 201 is arranged on the top plate or the side plate of the test cavity 1, and the microwave transmitting disc 203 transmits microwaves towards the rock test piece. The rock bearing base station 101 is arranged on the bottom plate of the test cavity 1, the microwave source 201 is arranged on the top plate or the side panel of the test cavity 1, and the relative position relation between the microwave source 201 and a rock test piece can be adjusted according to actual conditions so as to improve the universality of the system. Specifically, the microwave source 201 includes a power supply module, a transformer module, and a control circuit, and the microwave source 201 is configured by the power supply module, the transformer module, and the control circuit, thereby providing the test microwave.
The microwave control device 2 comprises a microwave source 201, a guided wave assembly and a microwave transmitting disc 203, converts electric energy into microwave energy, heats the rock by transmitting the microwave to achieve the effect of rapidly breaking the rock, and annular strain gauges 301 and axial strain gauges 302 are adhered to the rock test piece, each strain gauge is uniformly distributed at the middle point of each section of the rock test piece, and the strain gauges can measure annular strain and axial strain simultaneously.
The bottom plate, the side panels and the top plate are of plate-shaped double-layer structures consisting of metal layer cavities and heat insulation layer cavities; a taking and placing through hole is formed in the side panel, and the side door is arranged on the taking and placing through hole; the rock bearing foundation 101 is arranged on the bottom plate through a height adjusting assembly 102. Constitute bottom plate, side board and roof by metal level cavity and insulating layer cavity, whole test chamber 1 is bilayer structure promptly, can play better thermal-insulated and prevent the effect of radiation, guarantees the security of test process. And a height adjustment assembly 102 is provided to facilitate adjustment of the height of the rock bearing foundation 101, and thus the relative position between the rock test piece and the microwave control device 2, in accordance with the size of the rock test piece.
As shown in fig. 4, the measurement circuit 4 includes an amplifier 401 and a bridge 402; one end of the lead wire 5 is connected with the strain measuring device 3, the other end of the lead wire 5 is connected with the electric bridge 402 through the amplifier 401, and the electric bridge 402 is connected with the resistance strain gauge 6. The electric signals collected by the strain measuring device 3 are processed by the amplifier 401 and the bridge 402, which is beneficial to improving the reliability of test data.
The process of measuring based on the system comprises the following steps:
emitting microwaves to the rock test piece through a microwave control device 2;
after the microwave acts on the rock test piece, collecting a first resistance variation through the annular strain gauge 301 and the measuring circuit 4, collecting a second resistance variation through the axial strain gauge 302 and the measuring circuit 4, and inputting the collected first resistance variation and the second resistance variation into the resistance strain gauge 6;
the resistance strain gauge 6 obtains the rock annular volume strain according to the first resistance variation, obtains the rock axial volume strain according to the second resistance variation, and obtains the total volume application amount according to the rock annular volume strain and the rock axial volume strain
It should be noted that the measuring circuit 4 and the resistance strain gauge 6 function to automatically convert the resistance variation into the volume variation, which is a conventional application of the prior art to the measuring circuit 4 and the resistance strain gauge 6. Taking the example of setting 5 circumferential strain gauges 301 and 5 axial strain gauges 302 as an example, a specific process for analyzing the volume change of the rock is described.
And (3) setting the original height of the rock test piece as l and the radius of the cross section cylinder as r, taking a cylinder infinitesimal in the rock test piece, wherein the side length of each side is dl and dr, and then the volume of the infinitesimal before deformation is dV:
dV＝πdl·(dr)2。
axial strain epsilon measured by each section of strain gauge after deformationiAnnular strain of epsiloni′(i＝1，2，3，4，5)。
Each section of deformation can be considered as approximately uniform deformation, and the length change of each side after deformation is respectively as follows:
(1+εi)dl，(1+εi′)dr。
the volume of the deformed infinitesimal body is dV ═ pi (1+ epsilon)i)dl·(1+εi′)2(dr)2Then the volume strain θ is:
developing the above formula and neglecting high-order trace to obtain
θi＝εi+2εi′
Let the original volume of each segment be Vi 0After deformation, each section has a volume Vi. The total volume of the rock specimen is
To sum up, the utility model provides a microwave effect rock volume changes measurement system, including test chamber 1, microwave controlling means 2, strain measurement device 3, measuring circuit 4 and resistance strain gauge 6. The test cavity 1 is of a sealed cavity structure, and a rock test piece is placed in the test cavity 1; the microwave control device 2 is arranged in the test cavity 1, and the microwave control device 2 is used for providing microwaves acting on the rock test piece; the strain measurement device 3 comprises a plurality of annular strain gauges 301 and a plurality of axial strain gauges 302, the annular strain gauges 301 and the axial strain gauges 302 are respectively arranged, and the plurality of strain measurement devices 3 are attached to the surface of the rock test piece; the measuring circuit 4 is connected with a plurality of strain measuring devices 3 through leads 5, and the resistance strain gauge 6 is connected with the measuring circuit 4. The utility model discloses consider the inhomogeneous deformation that the rock test piece produced after receiving microwave heating, take annular deformation and axial deformation of segmentation measurement rock test piece each section, and the deformation of every section rock test piece is approximate for even deformation to try to obtain the whole volume after the rock test piece warp, get rid of the temperature variation and the liquid or gaseous volume change that leads to, measure the microwave action to rock volume influence size more accurately.
It is to be understood that the invention is not limited to the above-described embodiments, and that modifications and variations may be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (9)
1. A microwave-action rock volume change measurement system, comprising:
the test cavity is of a sealed cavity structure, and a rock test piece is placed in the test cavity;
the microwave control device is arranged inside the test cavity and is used for providing microwaves acting on the rock test piece;
the strain measurement device comprises a plurality of annular strain gauges and a plurality of axial strain gauges, wherein the plurality of the annular strain gauges and the plurality of the axial strain gauges are respectively attached to the surface of the rock test piece;
the measuring circuit is connected with the plurality of strain measuring devices through leads, and the resistance strain gauge is connected with the measuring circuit.
2. A microwave action rock volume change measurement system according to claim 1, characterised in that the strain measurement means comprises a sensitive grating, a substrate and a cover layer;
the sensitive grid, the substrate and the covering layer form a sheet structure, the sensitive grid is positioned between the substrate and the covering layer, and the sensitive grid is connected with the measuring circuit through a lead;
when the strain measurement device is attached to the surface of the rock test piece, the substrate is located at a position close to the rock test piece, and the covering layer is located at a position far away from the rock test piece.
3. A microwave action rock volume change measurement system according to claim 2, characterised in that the cover layer is a foamed silica layer.
4. A microwave action rock volume change measurement system according to claim 2, wherein in the hoop strain gage, the sensitive grids are arranged in a horizontal direction; in the axial strain gauge, the sensitive grids are arranged along a vertical direction.
5. A microwave action rock volume change measurement system according to claim 4, characterised in that there are 3-10 said hoop strain gages, said sensitive grids between each said hoop strain gage being parallel to each other;
3-10 axial strain gauges are arranged, and the sensitive grids among the axial strain gauges are parallel to each other.
6. A microwave action rock volume change measurement system according to claim 1, characterised in that the microwave control means comprises a microwave source, a waveguide assembly, a microwave launching disc, one end of the microwave source being connected to the waveguide assembly and the other end of the microwave source being connected to the microwave launching disc;
the test cavity consists of a bottom plate, a side plate and a top plate, a rock bearing base station is arranged on the bottom plate of the test cavity, and a rock test piece is placed on the rock bearing base station;
the microwave source is arranged on a top plate or a side panel of the test cavity, and the microwave transmitting disc transmits microwaves towards the rock test piece.
7. A microwave action rock volume change measurement system according to claim 6, wherein the microwave source includes a power supply assembly, a transformer assembly and control circuitry.
8. A microwave action rock volume change measurement system according to claim 6, characterised in that the bottom plate, the side plates and the top plate are of a plate-like double layer structure consisting of a metal layer cavity and a thermally insulating layer cavity;
a taking and placing through hole is formed in the side panel, and a side opening door is arranged on the taking and placing through hole;
the rock bearing base platform is arranged on the bottom plate through a height adjusting assembly.
9. A microwave action rock volume change measurement system according to claim 1, wherein the measurement circuitry includes an amplifier and a bridge;
one end of the lead wire is connected with the strain measuring device, the other end of the lead wire is connected with the electric bridge through the amplifier, and the electric bridge is connected with the resistance strain gauge.
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