CN219369299U - Plasma rock point load test device - Google Patents
Plasma rock point load test device Download PDFInfo
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- CN219369299U CN219369299U CN202320072596.0U CN202320072596U CN219369299U CN 219369299 U CN219369299 U CN 219369299U CN 202320072596 U CN202320072596 U CN 202320072596U CN 219369299 U CN219369299 U CN 219369299U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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Abstract
The utility model discloses a plasma rock point load test device, which comprises a rock sample fixing frame, a plasma-ultrasonic composite pressure head, a plasma generator and an ultrasonic tester, wherein the plasma sample fixing frame is arranged on the rock sample fixing frame; the rock sample fixing frame comprises a pressure monitor, a bearing plate and a jack which are sequentially arranged on the frame body from top to bottom; the plasma-ultrasonic composite pressure head consists of an ultrasonic upper pressure head and a plasma lower pressure head; the ultrasonic upper pressure head comprises an upper pressure head shell and an ultrasonic sensor, the ultrasonic sensor is connected with a plasma generator through a signal transmission line, and the plasma lower pressure head comprises a lower pressure head shell, an anode electrode, a cathode electrode and two high-voltage cables; the anode electrode and the cathode electrode are electrically connected with the plasma generator through two high-voltage cables; the device has the dual functions of mechanical rock breaking and plasma auxiliary mechanical rock breaking, can be widely applied to point load tests of various rock samples, and can be used for effectively, quickly and accurately obtaining rock strength through applying effective load to superhard rock.
Description
Technical Field
The utility model relates to the technical field of rock strength testing, in particular to a plasma rock point load testing device.
Background
Since the point load strength of rock can be used to estimate the rock strength, the rock point load test is an effective test method for rapidly obtaining the rock strength.
At present, the existing rock point load tester is a point load tester, and can indirectly estimate the relevant strength index of rock due to the characteristics of portability and suitability for irregular rock mass tests, and can effectively overcome the limitations of difficult sampling, high cost, time and labor waste and the like in a direct method. For surveys with short construction period, rock mechanical parameters can be rapidly acquired in a short time, and mechanical parameters such as preliminary scheme design and feasibility analysis of hard rock tunneller TBM, rock drill or drilling and blasting method construction are provided for construction.
However, in the test environment for superhard rock, the existing point load tester not only has the problem that mechanical rock breaking can cause high cutter abrasion, but also has the problem that effective mechanical rock breaking cannot be performed, and further the rock point load test fails. Plasma-assisted mechanical rock breaking is a novel rock breaking method with great potential, however, for analysis of the novel rock breaking method, effective experimental data and experimental devices are lacking. Therefore, it is necessary to design and develop a corresponding experimental device for introducing the plasma-assisted mechanical rock breaking technology into the point load test so as to obtain basic mechanical properties and physical experimental data of the rock under the condition of complex physical fields, and provide experimental support for optimizing and developing the efficient plasma rock breaking technology.
Disclosure of Invention
The utility model aims to provide a plasma rock point load test device for solving the problems in the prior art and effectively obtaining the load strength of superhard rock points.
For this purpose, the technical scheme of the utility model is as follows:
a plasma rock point load test device comprises a rock sample fixing frame, a plasma-ultrasonic composite pressure head, a plasma generator and an ultrasonic tester; the plasma-ultrasonic composite pressure head consists of an ultrasonic upper pressure head and a plasma lower pressure head; wherein, the liquid crystal display device comprises a liquid crystal display device,
the rock sample fixing frame comprises a pressure monitor, a bearing plate and a jack which are sequentially arranged on the frame body from top to bottom; the pressure monitor consists of a pressure sensor arranged in a monitor shell and an external pressure sensor detector, and the pressure sensor is arranged with the detection end facing downwards vertically; the jack is vertically arranged in a mode that a piston rod of the jack faces upwards, and the rod end of the piston rod is fixed at the center of the bottom surface of the bearing plate; the jack, the lower pressure head mounting screw hole, the upper pressure head mounting screw hole and the pressure sensor are coaxially arranged;
the ultrasonic upper pressure head comprises an upper pressure head shell and an ultrasonic sensor; the upper pressure head shell is a hollow shell with a conical bottom end, and the bottom end face of the conical bottom end is a plane and is provided with a central through hole which is communicated with the inner cavity of the shell in the middle; the ultrasonic sensor is arranged in the upper pressure head shell in a central manner that the detection end of the ultrasonic sensor is vertically downward, the detection end of the ultrasonic sensor is arranged in the central through hole in a penetrating way, and the detection end face of the ultrasonic sensor is flush with the bottom end face of the conical bottom end; the ultrasonic upper pressure head is fixed on the bottom surface of the monitor shell, and the pressure sensor is propped against the center of the top surface of the ultrasonic upper pressure head by the detection end of the pressure sensor; an ultrasonic data transmission line on the ultrasonic sensor is led out to the outer side of the shell through a line passing through hole arranged on the upper pressure head shell and is electrically connected with the ultrasonic tester;
the plasma lower pressure head comprises a lower pressure head shell, an anode electrode, a cathode electrode and two high-voltage cables; the lower pressure head shell is a hollow shell with a conical top end, and the top end face of the conical top end is a plane; two axial through holes are symmetrically formed in two sides of the conical top end; the anode electrode and the cathode electrode are vertically penetrated and fixed in the two axial through holes in a mode of processing the anode electrode and the cathode electrode into arc-shaped sheet electrode plates respectively, and the top end surfaces of the anode electrode and the cathode electrode are flush with the top end surface of the conical top end; one end of each of the two high-voltage cables is electrically connected with the bottom ends of the anode electrode and the cathode electrode respectively, and the other end of each of the two high-voltage cables is led out to the outer side of the shell through a wire passing through hole formed in the lower pressure head shell and is electrically connected with the plasma generator.
Further, the rock sample fixing frame also comprises a top plate, an inner support column group, an outer support column group and a bottom plate; wherein the top plate, the bearing plate and the bottom plate are mutually parallel from top to bottom and are arranged at intervals; the outer support column group consists of two outer support columns which are vertically arranged and are symmetrically arranged between the top plate and the bottom plate, the top ends of the two outer support columns are fixed on the top plate, and the bottom ends of the two outer support columns are fixed on the bottom plate, so that the distance between the top plate and the bottom plate is unchanged; the inner support column group consists of two ball screws with the same specification, the two ball screws are vertically arranged and symmetrically arranged between the top plate and the bearing plate, the top ends of the ball screws are fixed on the top plate, and nuts of the ball screws are penetrated and fixed in through holes formed in the bearing plate, so that the bearing plate can reciprocate along the axial direction through the two ball screws; the bottom of jack is fixed in the top surface center department of bottom plate, and pressure monitor passes through monitor shell to be fixed in the bottom surface center department of roof.
Further, an upper pressure head mounting screw hole is formed in the middle of the bottom surface of the monitor shell, and the end surface of the detection end of the pressure sensor is flush with the bottom of the upper pressure head mounting screw hole; correspondingly, an upper threaded connecting column which is vertically arranged is further fixed at the center of the top surface of the upper pressure head shell, the upper threaded connecting column is in threaded connection and fixed in an upper pressure head mounting screw hole, and the detection end of the pressure sensor is kept to be propped against the center of the top surface of the upper threaded connecting column.
Further, a lower pressure head mounting screw hole is formed in the center of the top surface of the pressure bearing plate, correspondingly, a lower threaded connecting column which is vertically arranged is further fixed in the center of the bottom surface of the lower pressure head shell, the lower threaded connecting column is fixedly connected in the lower pressure head mounting screw hole in a threaded manner, and the bottom surface of the lower threaded connecting column is pressed at the bottom of the lower pressure head mounting screw hole.
Further, epoxy resin is filled in the inner cavity of the upper pressure head shell, so that the ultrasonic sensor and the ultrasonic data transmission line are fixed in the shell after the epoxy resin is solidified.
Further, epoxy resin is filled in the inner cavity of the shell of the lower pressure head, so that the bottom ends of the anode electrode and the cathode electrode and the two high-voltage cables are fixed in the shell after the epoxy resin is solidified.
Compared with the prior art, the plasma rock point load test device has the dual functions of mechanical rock breaking and plasma auxiliary mechanical rock breaking, can be widely applied to point load tests of various rock samples, can realize high-efficiency, rapid and accurate acquisition of rock strength by applying effective load to ultra-hard rock samples, can acquire basic mechanical properties and physical test data of the rock under complex physical field conditions in the test process, comprises the steps of monitoring and acquiring the load, plasma damage strength and dynamic data of rock sample damage degree in the process of applying the effective load in real time, and provides simple and convenient in-situ test support for optimizing and developing the efficient plasma rock breaking technology.
Drawings
FIG. 1 is a schematic structural view of a plasma rock point load test apparatus of the present utility model;
FIG. 2 is a schematic view of the structure of a rock sample holder of the plasma rock point load test apparatus of the present utility model;
FIG. 3 is a schematic diagram of the structure of the upper ram of the plasma rock point load test apparatus of the present utility model;
fig. 4 is a schematic structural view of a lower ram of the plasma rock point load test apparatus of the present utility model.
Detailed Description
The utility model will now be further described with reference to the accompanying drawings and specific examples, which are in no way limiting.
Referring to fig. 1, the plasma rock point load test device comprises a rock sample fixing frame 1, a plasma-ultrasonic composite pressure head 2, a plasma generator 3 and an ultrasonic tester 4; wherein, the liquid crystal display device comprises a liquid crystal display device,
referring to fig. 2, the rock sample holder 1 includes a top plate 101, a pressure monitor 102, an inner support column group 103, a bearing plate 104, an outer support column group 105, a jack 106, and a bottom plate 107; in particular, the method comprises the steps of,
the top plate 101, the bearing plate 104 and the bottom plate 107 are parallel to each other from top to bottom and are arranged at intervals; the outer support column group 105 is composed of two outer support columns which are vertically arranged and symmetrically arranged between the top plate 101 and the bottom plate 107, and the top ends of the two outer support columns are fixed on the top plate 101, the bottom ends of the two outer support columns are fixed on the bottom plate 107, so that the distance between the top plate 101 and the bottom plate 107 is unchanged;
the inner support column group 103 is composed of two ball screws with the same specification, the two ball screws are vertically arranged and symmetrically arranged between the top plate 101 and the bearing plate 104, the top ends of the ball screws are fixed on the top plate 101, and nuts of the ball screws are penetrated and fixed in through holes formed in the bearing plate 104, so that the bearing plate 104 can reciprocate along the axial direction through the two ball screws;
the jack 106 is vertically fixed at the center of the top surface of the bottom plate 107 in a way that the piston rod of the jack 106 faces upwards, and the rod end of the piston rod of the jack 106 is fixed at the center of the bottom surface of the bearing plate 104 so as to drive the bearing plate 104 to move up and down in the axial direction through the reciprocating telescopic movement of the piston rod; a lower pressure head mounting screw hole is formed in the center of the top surface of the pressure bearing plate 104;
the pressure monitor 102 is composed of a monitor housing, a pressure sensor and a pressure sensor detector, wherein the pressure sensor and the pressure sensor detector are arranged in the inner cavity of the housing; an upper pressure head mounting screw hole is formed in the middle position of the bottom surface of the monitor shell, the bottom of the upper pressure head mounting screw hole is communicated with the inner cavity of the shell, the pressure sensor is centrally fixed in the inner cavity of the shell in a mode that the detection end of the pressure sensor is vertically downward, and the end surface of the detection end of the pressure sensor is flush with the bottom of the upper pressure head mounting screw hole; the pressure sensor detector is positioned at the outer side of the monitor shell and is connected with the pressure sensor through a data transmission line so as to display pressure data acquired by the pressure sensor in real time;
the pressure monitor 102 is fixed at the center of the bottom surface of the top plate 101 through a monitor housing; the jack 106, the lower pressure head mounting screw hole, the upper pressure head mounting screw hole and the pressure sensor are coaxially arranged;
the plasma-ultrasonic composite pressure head 2 is composed of an ultrasonic upper pressure head 201 and a plasma lower pressure head 202; wherein, the liquid crystal display device comprises a liquid crystal display device,
referring to fig. 3, ultrasonic upper ram 201 includes upper ram housing 2011, ultrasonic transducer 2012, and upper threaded connection post 2013; in particular, the method comprises the steps of,
the upper pressure head shell 2011 is a hollow shell with a conical bottom end, and the bottom end face of the conical bottom end is a plane and is provided with a central through hole which is communicated with the inner cavity of the shell in the middle; the ultrasonic sensor 2012 is centrally arranged in the upper pressure head shell 2011 in a mode that the detection end of the ultrasonic sensor 2012 is vertically downward, the detection end of the ultrasonic sensor 2012 is arranged in the central through hole in a penetrating manner, and the detection end face of the ultrasonic sensor 2012 is flush with the bottom end face of the conical bottom end, so that the detection end of the ultrasonic sensor 2012 can always keep contact with a rock sample in the test process, and the bottom end face of the conical bottom end of the upper pressure head shell 2011 is used as a stress surface to compress the rock sample and protect the detection end of the ultrasonic sensor from being damaged;
the upper threaded connection column 2013 is vertically arranged and fixed at the center of the top surface of the upper pressure head shell 2011, and a line passing through hole penetrating through the inner cavity of the upper pressure head shell 2011 is axially formed in the top surface of the upper threaded connection column 2013, so that the other end of an ultrasonic data transmission line 2015 on the ultrasonic sensor 2012 is led out to the outer side of the ultrasonic upper pressure head 201 through the line passing through hole; the inner cavity of the upper pressure head shell 2011 is filled with epoxy resin 2014, so that the ultrasonic sensor 2012 and the ultrasonic data transmission line 2015 are fixed in the shell after the epoxy resin is cured;
referring to fig. 4, the plasma lower ram 202 includes a lower ram housing 2021, an anode 2022, a cathode 2023, a lower threaded connection 2024, and two high voltage cables 2025; in particular, the method comprises the steps of,
the lower ram housing 2021 is a hollow housing having a tapered tip, and the tip end face of the tapered tip is a plane as a force receiving surface; two axial through holes are symmetrically formed in two sides of the conical top end; the positive electrode 2022 and the negative electrode 2023 are arc-shaped sheet-shaped electrode plates, so that the structures of the positive electrode 2022 and the negative electrode 2023 are similar to those of a spring piece, the positive electrode 2022 and the negative electrode are vertically penetrated and fixed in two axial through holes at two sides of the conical top end, and the top end surfaces of the positive electrode 2022 and the negative electrode 2023 are flush with the top end surfaces of the conical top end, so that the front ends of the positive electrode 2022 and the negative electrode 2023 can be always kept in contact with a rock sample in a test process;
the lower threaded connection column 2024 is vertically arranged and fixed at the center of the bottom surface of the lower pressure head shell 2021, and a wire passing through hole penetrating to the inner cavity of the lower pressure head shell 2021 is axially formed from the bottom surface of the lower threaded connection column 2024, so that the other ends of two high-voltage cables 2025 respectively connected to the bottom ends of the anode electrode 2022 and the cathode electrode 2023 are led out to the outer side of the plasma lower pressure head 202 through the wire passing through holes; the inner cavity of the lower pressure head shell 2021 is filled with epoxy resin, so that the bottom ends of the anode electrode 2022 and the cathode electrode 2023 and the two high-voltage cables 2025 are fixed in the shell after the epoxy resin is cured;
the ultrasonic upper pressure head 201 is fixed in an upper pressure head mounting screw hole of the pressure monitor 102 through an upper threaded connecting column 2013 in a threaded connection manner, and a detection end of the pressure sensor is kept to be propped against the center of the top surface of the upper threaded connecting column 2013; the plasma lower pressure head 202 is fixedly connected in a lower pressure head mounting screw hole on the pressure bearing plate 104 through a lower threaded connecting column 2024, and the bottom surface of the plasma lower pressure head 202 is press-fit at the bottom of the lower pressure head mounting screw hole; the upper pressure head shell 2011 and the lower pressure head shell 2021 are made of hard alloy, and specific materials can be selected to be consistent with the materials of other pressure heads for load tests;
the plasma generator 3 is a commercial product, which is respectively connected with two high-voltage cables 2025; the ultrasonic tester 4 is a commercially available product that is connected to an ultrasonic data transmission line 2015 of the ultrasonic sensor 2012.
The method of use and the principle of operation of the apparatus will be further described below with reference to the point load test of a superhard rock sample using the plasma rock point load test apparatus.
As shown in fig. 1, the specific implementation process of the point load test is as follows:
s1, connecting a rock sample fixing frame 1, a plasma-ultrasonic composite pressure head 2, a plasma generator 3 and an ultrasonic tester 4, and clamping a digital camera 5 in front of the rock sample fixing frame 1, wherein the digital camera is used for collecting image changes of a rock sample in the whole test process;
s2, applying a pretightening force through a jack 106 to fix the rock sample between an upper pressure head and a lower pressure head; the pressure sensor detector is used for displaying the load born by the rock sample in real time;
s3, controlling the ultrasonic sensor 2012 to emit ultrasonic waves by the ultrasonic tester 4, and collecting the ultrasonic waves reflected by the rock sample;
s4, lifting and applying load to the rock sample by using the jack 106;
s5, controlling the anode 2022 and the cathode 2023 to apply high voltage to the rock sample by utilizing the plasma generator 3 so as to cause plasma damage to the rock sample; meanwhile, ultrasonic waves are continuously emitted by the ultrasonic sensor 2012, the rock samples are collected and reflected to obtain ultrasonic waves, and the damage condition of the rock samples is obtained; continuously acquiring rock sample images by using the digital camera 5 to acquire damage morphology change images of the rock samples;
s6, repeating the step S4 and the step S5 until the rock sample is completely destroyed;
and S7, collecting the data obtained in the steps S2 to S6, and analyzing to obtain the strength of the rock sample.
Claims (6)
1. The plasma rock point load test device is characterized by comprising a rock sample fixing frame (1), a plasma-ultrasonic composite pressure head (2), a plasma generator (3) and an ultrasonic tester (4); the plasma-ultrasonic composite pressure head (2) consists of an ultrasonic upper pressure head (201) and a plasma lower pressure head (202); wherein, the liquid crystal display device comprises a liquid crystal display device,
the rock sample fixing frame (1) comprises a pressure monitor (102), a bearing plate (104) and a jack (106) which are sequentially arranged on the frame body from top to bottom; the pressure monitor (102) is composed of a pressure sensor arranged in the monitor shell and an external pressure sensor detector, and the pressure sensor is arranged with the detection end facing downwards vertically; the jack (106) is vertically arranged in a mode that a piston rod of the jack faces upwards, and a rod end of the piston rod is fixed at the center of the bottom surface of the bearing plate (104); the jack (106), the lower pressure head mounting screw hole, the upper pressure head mounting screw hole and the pressure sensor are coaxially arranged;
the ultrasonic upper ram (201) includes an upper ram housing (2011) and an ultrasonic sensor (2012); the upper pressure head shell (2011) is a hollow shell with a conical bottom end, and the bottom end face of the conical bottom end is a plane and is provided with a central through hole communicated with the inner cavity of the shell in the middle; the ultrasonic sensor (2012) is centrally arranged in the upper pressure head shell (2011) in a mode that the detection end of the ultrasonic sensor (2012) is vertically downward, the detection end of the ultrasonic sensor (2012) is arranged in the central through hole in a penetrating way, and the detection end face of the ultrasonic sensor is flush with the bottom end face of the conical bottom end; the ultrasonic upper pressure head (201) is fixed on the bottom surface of the monitor shell, and the pressure sensor is propped against the center of the top surface of the ultrasonic upper pressure head (201) by the detection end of the pressure sensor; an ultrasonic data transmission line (2015) on the ultrasonic sensor (2012) is led out to the outer side of the shell through a line passing through hole arranged on the upper pressure head shell (2011) and is electrically connected with the ultrasonic tester (4);
the plasma lower pressure head (202) comprises a lower pressure head shell (2021), an anode electrode (2022), a cathode electrode (2023) and two high-voltage cables (2025); the lower pressure head shell (2021) is a hollow shell with a conical top end, and the top end face of the conical top end is a plane; two axial through holes are symmetrically formed in two sides of the conical top end; the positive electrode (2022) and the negative electrode (2023) are vertically penetrated and fixed in the two axial through holes in a mode of processing the positive electrode and the negative electrode into arc-shaped sheet-shaped electrode plates respectively, and the top end surfaces of the positive electrode and the negative electrode are flush with the top end surface of the conical top end; one end of each of the two high-voltage cables (2025) is electrically connected with the bottom ends of the anode electrode (2022) and the cathode electrode (2023), and the other end of each of the two high-voltage cables is led out to the outer side of the lower pressure head shell (2021) through a wire passing through hole formed in the lower pressure head shell and is electrically connected with the plasma generator (3).
2. The plasma rock point load testing device of claim 1, wherein the rock sample holder (1) further comprises a top plate (101), an inner set of support columns (103), an outer set of support columns (105) and a bottom plate (107); wherein the top plate (101), the bearing plate (104) and the bottom plate (107) are mutually parallel from top to bottom and are arranged at intervals; the outer support column group (105) is composed of two outer support columns which are vertically arranged and are symmetrically arranged between the top plate (101) and the bottom plate (107), the top ends of the two outer support columns are fixed on the top plate (101) and the bottom ends of the two outer support columns are fixed on the bottom plate (107), so that the distance between the top plate (101) and the bottom plate (107) is unchanged; the inner support column group (103) is composed of two ball screws with the same specification, the two ball screws are vertically arranged and symmetrically arranged between the top plate (101) and the bearing plate (104), the top ends of the ball screws are fixed on the top plate (101), and nuts of the ball screws are penetrated and fixed in through holes formed in the bearing plate (104), so that the bearing plate (104) can reciprocate along the axial direction through the two ball screws; the bottom end of the jack (106) is fixed at the center of the top surface of the bottom plate (107), and the pressure monitor (102) is fixed at the center of the bottom surface of the top plate (101) through the monitor shell.
3. The plasma rock point load test device according to claim 1, wherein an upper pressure head mounting screw hole is formed in the middle of the bottom surface of the monitor housing, and the end surface of the detection end of the pressure sensor is flush with the bottom of the upper pressure head mounting screw hole; correspondingly, an upper threaded connection column (2013) which is vertically arranged is further fixed at the center of the top surface of the upper pressure head shell (2011), the upper threaded connection column (2013) is fixedly connected in an upper pressure head installation screw hole in a threaded mode, and the detection end of the pressure sensor is kept to be abutted against the center of the top surface of the upper threaded connection column (2013).
4. The plasma rock point load test device according to claim 1, wherein a lower pressure head mounting screw hole is formed in the center of the top surface of the pressure bearing plate (104), correspondingly, a lower threaded connecting column (2024) which is vertically arranged is further fixed in the center of the bottom surface of the lower pressure head shell (2021), the lower threaded connecting column (2024) is fixedly connected in the lower pressure head mounting screw hole in a threaded manner, and the bottom surface of the lower threaded connecting column is press-fit at the bottom of the lower pressure head mounting screw hole.
5. The plasma rock point load test device according to claim 1, characterized in that an inner cavity of the upper ram housing (2011) is filled with epoxy resin (2014), so that the ultrasonic sensor (2012) and the ultrasonic data transmission line (2015) are fixed in the housing after the epoxy resin is cured.
6. The plasma rock point load test device according to claim 1, wherein the inner cavity of the lower ram housing (2021) is filled with epoxy resin, so that the bottom ends of the anode electrode (2022) and the cathode electrode (2023) and the two high-voltage cables (2025) are fixed in the housing after the epoxy resin is cured.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320072596.0U CN219369299U (en) | 2023-01-10 | 2023-01-10 | Plasma rock point load test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320072596.0U CN219369299U (en) | 2023-01-10 | 2023-01-10 | Plasma rock point load test device |
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| CN219369299U true CN219369299U (en) | 2023-07-18 |
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| CN202320072596.0U Active CN219369299U (en) | 2023-01-10 | 2023-01-10 | Plasma rock point load test device |
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