A core multi-physical parameter acquisition device and measurement method thereof

Abstract

The invention relates to a device for acquiring multiple physical parameters of a core and a measuring method thereof. The device comprises a cylindrical openable inner cylinder, a clamping device, a cylinder cover, a length adjusting device, a sensing device, a cylinder cover, and a circular patch. The inner cylinder is made of a non-metallic insulating material. The sensing device is used to detect one or more parameters of the core, including magnetic susceptibility, resistivity, density, mass, temperature, humidity, and P-wave velocity. The method of the invention can obtain multiple parameter information at one time, and ensure the depth consistency of various core parameter information obtained, with high test accuracy and small test error, and simplifies the operation process and improves the operation efficiency.

Description

Technical Field

[0001] This patent application belongs to the technical field of geological survey equipment, and more specifically, relates to a device for acquiring multiple physical parameters of a core and a measurement method thereof. Background Art

[0002] Rock cores are the physical geological data that can most directly reflect the characteristics of underground structures. my country has preserved a huge amount of rock cores. Due to various reasons, the storage environment of rock cores is poor and there is a possibility of further damage. The proportion of rock core digitization is extremely low, and the digitalization methods are single and backward, only staying at the image level. Most of them have not yet carried out quantitative and semi-quantitative digitization of rock core physical and chemical parameters. However, the various physical parameter information of rock cores is precisely the basis of research work, so it is urgent to carry out core digitization work. At present, the physical parameters of rock cores are roughly divided into magnetic susceptibility, resistivity, density, P-wave velocity, etc. Among them:

[0003] The magnetic susceptibility is obtained by measuring the magnetic field strength of the core and then calculating it with the magnetization strength.

[0004] The resistivity test method is to use Ohm's law to calculate the resistivity at both ends of the core by testing the voltage and current values;

[0005] Density is measured by the ratio of mass to volume;

[0006] The P-wave velocity is obtained by dividing the core length by the high-voltage pulse that sends a signal from one end of the core to the other.

[0007] Since the measurement methods of the above parameters are different and there will be interference during the measurement of limited parameters, there is currently no device on the market that can measure multiple parameters at one time, resulting in inconsistent depths of multiple measurements. At the same time, although there are a variety of test instruments on the market, such as magnetic susceptibility meters, resistivity meters, density meters, etc., there is no instrument that can integrate multiple parameters. Even if there is, it is a large device or relatively expensive, and is only suitable for indoor work, not for field work. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a device for obtaining multiple physical parameters of a core and a measurement method thereof, so as to achieve the purpose of obtaining multiple parameters in one measurement and ensure the depth consistency of various core parameter information obtained.

[0009] In order to solve the above problems, the technical solution adopted by the present invention is:

[0010] A core multi-physical parameter acquisition device comprises an outer cylinder and an inner cylinder arranged inside and outside, a clamping device arranged in the inner cylinder for clamping the core, a length adjustment device arranged outside the inner cylinder and moving along the length direction of the inner cylinder, a sensor arranged in the inner cylinder, cylinder covers arranged at both ends of the length adjustment device, and a circular patch arranged on the inner wall of the cylinder cover, wherein both the outer cylinder and the inner cylinder can be opened, and the cylinder cover matches the inner diameter of the inner cylinder;

[0011] The inner cylinder is made of non-metallic insulating material; the two ends of the length adjustment device can extend outward or retract inward, so that the cylinder cover can extend outward or retract inward along with the length adjustment device; the sensing device is used to detect one or more parameters of the core's magnetic susceptibility, resistivity, density, mass, temperature, humidity and P-wave velocity.

[0012] A further improvement of the technical solution of the present invention is that the inner cylinder is made of tempered glass or rubber, and the inner cylinder comprises an upper semi-cylinder and a lower semi-cylinder, and the upper semi-cylinder and the lower semi-cylinder are movably connected by a hinge.

[0013] A further improvement of the technical solution of the present invention is that the clamping device includes a plurality of clamping assemblies circumferentially arranged in the inner cylinder, each clamping assembly includes a first drive device, a telescopic rod connected to the output end of the first drive device, and a clamping body correspondingly connected to the free end of each telescopic rod, the clamping body is in contact with the core, and all the first drive devices are connected to the control switch.

[0014] The further improvement of the technical solution of the present invention is that: the clamping components are divided into three groups, the clamping body is arc-shaped or sheet-shaped, a buffer layer is provided at the contact and matching position between the clamping body and the core, and the first driving device is a driving motor.

[0015] A further improvement of the technical solution of the present invention is that the length adjustment device includes a slideway axially arranged on the outer wall of the inner cylinder, a second driving device arranged in the slideway, a sliding rod slidingly matched with the slideway and bidirectionally connected to the second driving device, a transition rod correspondingly connected to the sliding rod, and the transition rod movably connected to the cylinder cover. Alternatively, the components can be simplified, for example, the slideway, the sliding rod, and the second driving device can be set as a screw rod, and the screw rod is connected to the transition rod.

[0016] A further improvement of the technical solution of the present invention is that the transition rod is an L-shaped transition rod, the cylinder cover comprises a left cylinder cover and a right cylinder cover, and the transition rod is movably connected to the left cylinder cover and the right cylinder cover via a buckle.

[0017] A further improvement of the technical solution of the present invention is that the sensing device includes a weight sensor, a temperature sensor, a humidity sensor, a P-wave velocity sensor, a resistivity sensor, and a magnetic susceptibility sensor, wherein:

[0018] The weight sensor is arranged in the lower semi-cylinder;

[0019] The temperature sensor and the humidity sensor are arranged at the bottom end of the inner wall of the lower semi-cylinder;

[0020] The P-wave velocity sensor is arranged in the middle of each circular patch, and the two P-wave velocity sensors are connected by a wire;

[0021] The resistivity sensor is arranged on each circular patch and is located on the outer circle of the P-wave velocity sensor, and the two resistivity sensors are connected by a wire;

[0022] The magnetic susceptibility sensors are located at two ends of the inner wall of the upper semi-cylinder, and the two magnetic susceptibility sensors are located between the two circular patches.

[0023] A further improvement of the technical solution of the present invention is that a ring-wire barrier line is also provided on the circular patch, and the ring-wire barrier line is located between the P-wave velocity sensor and the resistivity sensor.

[0024] A method for measuring multiple physical parameters of a core, using the above-mentioned device for acquiring multiple physical parameters of a core, comprises the following steps:

[0025] Step 1: Pre-process the core to be tested and grind both ends of the core flat;

[0026] Step 2: Open the outer cylinder and the inner cylinder in sequence, put the core to be tested into the inner cylinder, and then close the inner cylinder;

[0027] Step 3: Turn on the control switch of the first driving device in the clamping device, and fix and clamp the core through the clamping device;

[0028] Step 4: Turn on the switch of the second driving device in the length adjustment device. According to the length of the core, the left and right barrel covers extend outward or retract inward as the sliding rod moves, fixing the two ends of the core, so that the P-wave velocity sensor and resistivity sensor on the circular patch are tightly coupled with the end of the core;

[0029] Step 5: Close the outer cylinder, start the instrument switch, and measure the core data through the external control software of the instrument, and measure the core density, resistivity, P-wave velocity and magnetic susceptibility parameter information in turn;

[0030] Step 6: Density measurement: obtain the weight of the core through the weight sensor, and obtain the length of the core through the displacement of the sliding rod; clamp the core through the clamping device and obtain the diameter of the core, and then use the matching electronic counter to accurately obtain the length and diameter of the core, and further obtain the volume of the core, so as to obtain the density information of the core;

[0031] Step 7: Resistivity measurement. The resistivity sensors on the circular patches at both ends of the core are connected to each other through wires. Then a certain voltage is applied, and the resistivity information is calculated through the information of voltage, current and resistance. At the same time, the current humidity and temperature values ​​are recorded through the temperature sensor and humidity sensor.

[0032] Step 8: P-wave velocity measurement. The P-wave velocity sensors at both ends of the core are connected through wires. A high-voltage pulse signal is sent from one end of the core and received at the other end of the core. The P-wave velocity information is calculated based on the receiving time and the core length.

[0033] Step 9: Magnetic susceptibility measurement: a magnetic field is applied inside the inner cylinder, and the magnetic susceptibility sensors at both ends obtain magnetic force, and the magnetic susceptibility information is obtained through the magnetic moment;

[0034] Step 10: After the parameter measurement is completed, the density, resistivity, velocity and magnetic susceptibility information of the core are displayed according to the depth information through the external control software.

[0035] A further improvement of the technical solution of the present invention is that the magnetic susceptibility sensor is symmetrically located at the top end of the inner wall of the upper semi-cylinder.

[0036] Due to the adoption of the above technical solution, the beneficial effects achieved by the present invention are:

[0037] The device for obtaining multiple physical properties of the core of the present invention can place the core inside the device. The core does not need to be completely wrapped by the inner cylinder 1, and can be half-wrapped (one end is wrapped and the other end is not wrapped) or both ends are exposed due to being too long. The clamping device and the length adjustment device are used to effectively match the length and thickness of different cores, so that the core can be tightly coupled with the sensor around and at both ends.

[0038] The clamping device has a simple structure and is easy to install and use. The length adjustment device is reasonably positioned and does not affect other functions of the inner cylinder. It can not only obtain length and thickness and diameter data in real time, but also help the P-wave velocity sensor and resistivity sensor on the circular patch to be in close contact with the core, thereby improving data measurement accuracy.

[0039] Various types of sensors are set up to obtain various parameters. In terms of sensor location layout, different sensors are placed in different locations to effectively eliminate mutual interference between sensors and achieve the purpose of obtaining multiple parameters in one measurement.

[0040] The measuring method of the present invention integrates multiple sensor measurements such as core magnetic susceptibility, resistivity, P-wave velocity, density, temperature, humidity, etc., and can obtain multiple parameter information at one time through a sequentially started measuring method, and ensure the depth consistency of various core parameter information obtained, with high test accuracy and small test error, and simplifies the operation process and improves the operation efficiency. The portable device is suitable for various working environments and can be used to carry out work in large quantities, which will promote the digitalization of my country's core to a new level. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural schematic diagram of the device of the present invention;

[0042] Figure 2 It is a schematic diagram of the structure of a circular patch of the device of the present invention;

[0043] Figure 3 A schematic structural diagram of the clamping device of the device of the present invention from another angle;

[0044] Figure 4 It is a schematic diagram of the installation effect of the length adjustment device and the cylinder cover of the device of the present invention;

[0045] Among them: 1. inner cylinder, 4. clamping device, 41. clamping body, 42. telescopic rod, 43. buffer layer, 5. length adjustment device, 51. sliding rod, 52. circular patch, 53. slideway, 54. transition rod, 61. upper semi-cylinder, 62. lower semi-cylinder, 7. hinge, 81. weight sensor, 82. temperature sensor, 83. humidity sensor, 84. P-wave velocity sensor, 85. resistivity sensor, 86. magnetic susceptibility sensor, 91. left cylinder cover, 92. right cylinder cover, 10. ring wire barrier line, 11. sealing strip. DETAILED DESCRIPTION

[0046] The present invention is further described in detail below with reference to the embodiments.

[0047] The present invention discloses a device for acquiring multiple physical parameters of a core, see Figure 1-Figure 4 , including a cylindrical outer cylinder and an inner cylinder 1 arranged inside and outside, a clamping device 4 for clamping the core arranged in the inner cylinder 1, a length adjustment device 5 arranged outside the inner cylinder 1 and moving along the length direction of the inner cylinder 1, a sensor arranged in the inner cylinder 1, cylinder covers arranged at both ends of the length adjustment device 5, and a circular patch 52 arranged on the inner wall of the cylinder cover. Both the outer cylinder and the inner cylinder 1 can be opened, the cylinder cover matches the inner diameter of the inner cylinder 1, and the outer cylinder can be opened in a semicircle. The function of the outer cylinder is to place the inner cylinder 1 and protect the inner cylinder 1 or the exposed core from being bumped or contaminated by the outside. The outer cylinder is not a protection point of this patent and is not drawn in the drawings. The barrel part of the inner cylinder 1 can be opened except for the barrel cover, and the barrel cover is not connected to the barrel.

[0048] The inner cylinder 1 is made of non-metallic insulating material; the two ends of the length adjustment device 5 can extend outward or retract inward, so that the cylinder cover can extend outward or retract inward along with the length adjustment device 5, and the sensing device is used to detect one or more parameters of the core magnetic susceptibility, resistivity, density, mass, temperature, humidity and P-wave velocity. Of course, the circular patch 52 can be other shapes, such as rectangular, diamond, as long as it can meet the needs of use.

[0049] Since the measurement of magnetic susceptibility and resistivity may be interfered by metal materials, in order to prevent interference, the inner cylinder 1 is preferably made of tempered glass or rubber. The inner cylinder 1 includes an upper semi-cylinder 61 and a lower semi-cylinder 62. The upper semi-cylinder 61 and the lower semi-cylinder 62 are movably connected by a hinge 7 for smoother opening. The length adjustment device 5 is located on the upper semi-cylinder 61.

[0050] The clamping device 4 includes a plurality of clamping assemblies circumferentially arranged in the inner cylinder 1, each of which includes a first drive device, a telescopic rod 42 connected to the output end of the first drive device, and a clamping body 41 correspondingly connected to the free end of each telescopic rod 42, the clamping body 41 is in contact with the core, and all the first drive devices are connected to the control switch. A groove for accommodating the first drive device, the clamping body 41 and the telescopic rod 42 is also provided in the inner cylinder 1. Of course, in actual use, the clamping device 4 can be operated in advance so that the core contacts with several of the clamping bodies 41, and then after closing the inner cylinder 1, the clamping device 4 is adjusted to achieve the clamping operation.

[0051] The clamping components are preferably three groups, each of which is 120°. To ensure the clamping effect, four groups can also be used, which are selected according to the actual situation and the diameter and thickness of the inner cylinder. The clamping body 41 is an arc-shaped or sheet-shaped clamping body. A buffer layer 43 is provided at the contact point between the clamping body 41 and the core. The buffer layer 43 is made of a flexible material, such as sponge, to prevent the core from being damaged. The first driving device is a driving motor.

[0052] Because the lengths of the cores are different, the tube cover can be adjusted to extend outward or contract inward through the length adjustment device 5 to achieve the purpose of coupling the two ends of the core. The tube cover and the tube body do not need to completely cover the core.

[0053] The cylinder cover comprises a left cylinder cover 91 and a right cylinder cover 92, and the left cylinder cover 91 and the right cylinder cover 92 are connected to the length adjustment device 5. That is, the two cylinder covers can extend outside the cylinder body, and can also be inside the cylinder body.

[0054] The length adjustment device 5 includes a slideway 53 axially arranged on the outer wall of the inner cylinder 1, a second driving device arranged in the slideway 53, a sliding rod 51 slidingly matched with the slideway 53 and bidirectionally connected to the second driving device, and a transition rod 54 correspondingly connected to the sliding rod 51, and the transition rod 54 is movably connected to the cylinder cover. The slideway 53, the sliding rod 51, the transition rod 54, and the second driving device can also be designed as a screw rod as a whole, such as an electric screw rod.

[0055] The transition rod 54 is an L-shaped transition rod, and the length and proportion of the "L-shaped" structure of the L-shaped transition rod can be adjusted to adapt to the use of different cores. The core does not need to be completely wrapped by the inner cylinder 1, and can be half-wrapped (one end is wrapped and the other end is not wrapped) or both ends are exposed due to being too long, and the exposed core is protected by the outer cylinder. The sliding rod 51 and the L-shaped transition rod 54 play a role in adjusting and adapting to shorter or longer cores. In actual use, the sliding rod 51 and the L-shaped transition rod 54 also have a measurement range and can adapt to a certain model of cores. Cores that exceed the model need to be replaced with other core multi-physical parameter acquisition devices (the device has multiple models for selection).

[0056] The cylinder cover includes a left cylinder cover 91 and a right cylinder cover 92 , and the transition rod 54 is movably connected to the left cylinder cover 91 and the right cylinder cover 92 via a buckle.

[0057] The diameter of the circular patch 52 is 8 cm. The circular patch 52 may also be a patch of other shapes as long as it can meet the patch requirements.

[0058] The sensing device includes a weight sensor 81, a temperature sensor 82, a humidity sensor 83, a P-wave velocity sensor 84, a resistivity sensor 85, and a magnetic susceptibility sensor 86. The weight sensor 81 is arranged in the lower semi-cylinder 62, and the temperature sensor 82 and the humidity sensor 83 are arranged at the bottom end of the inner wall of the lower semi-cylinder 62.

[0059] The P-wave velocity sensor 84 is disposed in the middle of each circular patch 52, at a section of a small circle 4 cm from the inside to the outside, and the two P-wave velocity sensors 84 are connected by a wire;

[0060] The resistivity sensor 85 is symmetrically arranged on each circular patch 52 and located on the periphery of the P-wave velocity sensor 84. The resistivity sensor 85 is located on the outer ring circular patch 52 4-8CM from the inside to the outside;

[0061] The magnetic susceptibility sensors 86 are located at both ends of the inner wall of the upper semi-cylinder 61, and the number is two, and the two magnetic susceptibility sensors 86 are located between the two circular patches 52. The rectangular block structure similar to the magnetic susceptibility sensor 86 below the sliding rod 51 is a lighting lamp, and the lighting lamps are also two symmetrical left and right.

[0062] The circular patch 52 is also provided with a ring wire barrier line 10 (or other lines or barriers for realizing regional barrier), and the ring wire barrier line 10 is located between the P wave velocity sensor 84 and the resistivity sensor 85. Since the P wave velocity sensor 84 and the resistivity sensor 85 need to be coated with adhesive when in use, the ring wire barrier line 10 is used to block different adhesives, thereby improving the measurement accuracy. For example, vaseline is coated on the inner circle of the ring wire barrier line 10 for the P wave velocity sensor 84, and copper sulfate is coated on the outer circle for the resistivity sensor 85, so that the two types of sensors are fully coupled with the core section, thereby ensuring more accurate measurement of P wave velocity and resistivity information.

[0063] The core multi-physical parameter acquisition device is used to measure the core multi-physical parameters. The specific measurement method includes the following steps:

[0064] Step 1: Pre-process the core to be tested and grind both ends of the core flat.

[0065] Step 2: Open the outer cylinder and the inner cylinder 1 in sequence, place the core to be tested into the inner cylinder 1, then close the inner cylinder 1, and make internal adjustments through the clamping device 4 to fix and clamp the core.

[0066] Step 3: Turn on the control switch of the first driving device in the clamping device 4, and fix and clamp the core through the clamping device 4; the control switches of all the first driving devices can be connected through the solenoid valve, and the on and off of the solenoid valve can be controlled to realize the action of the clamping device.

[0067] Step 4: By using the switch of the second driving device in the length adjustment device 5, the left cylinder cover 91 and the right cylinder cover 92 extend outward or retract inward as the sliding rod 51 moves and drives the transition rod 54, so that the two cylinder covers fix the two ends of the core according to the core length, so that the P wave velocity sensor 84 and the resistivity sensor 85 on the circular patch 52 are tightly coupled with the core end. Of course, it is also possible to set only one cylinder cover to move and the other cylinder cover not to move, such as the right cylinder cover 92 is adjustable and the left cylinder cover 91 is fixed, in order to emphasize that as long as the length adjustment can be met and the length measurement of cores of different lengths can be achieved.

[0068] Step 5: Close the outer cylinder, start the instrument switch, and measure the core density, resistivity, P-wave velocity and magnetic susceptibility parameter information in sequence through the instrument's external control software.

[0069] Step 6: Density measurement: obtain the weight of the core through the weight sensor 81, and obtain the length of the core through the displacement of the sliding rod 51 (for example, a scale can be set on the sliding rod 51, or the sliding rod 51 can be connected to a digital calculator to obtain length data); clamp the core through the clamping device 4 and obtain the diameter of the core, accurately obtain the length and diameter of the core, and further obtain the volume of the core, thereby obtaining the density information of the core.

[0070] Step 7: Resistivity measurement. The resistivity sensors 85 on the circular patches 52 at both ends of the core are connected to each other through wires. Then a certain voltage is applied, and then the resistivity information is calculated through the information of voltage, current and resistance. At the same time, the current humidity and temperature values ​​are recorded through the temperature sensor 82 and the humidity sensor 83.

[0071] Step 8: P-wave velocity measurement. The P-wave velocity sensors 84 at both ends of the core are connected by wires. A high-voltage pulse signal is sent from one end of the core and received at the other end of the core. The P-wave velocity information is calculated based on the receiving time and the core length.

[0072] Step 9: Magnetic susceptibility measurement: a magnetic field is applied to the inner cylinder 1, and the magnetic susceptibility sensors 86 at both ends obtain magnetic force and obtain magnetic susceptibility information through magnetic moments; the magnetic susceptibility sensors 86 are symmetrically located at the top of the inner wall of the upper semi-cylinder.

[0073] Step 10: After the parameter measurement is completed, the density, resistivity, velocity and magnetic susceptibility information of the core are displayed according to the depth information through the external control software of the instrument.

[0074] In actual use: the weight sensor 81 is a prior art, and the weight data is obtained by subtracting the weight of the device without placing the core from the total weight of the device after placing the core, so as to obtain the weight value of the core for calculation and testing.

[0075] The device and the measuring method can achieve the purpose of obtaining multiple parameters in one measurement, ensure the consistency of the depth of various parameter information of the core obtained, and have the characteristics of high measurement accuracy, time and labor saving, easy to carry, and suitable for outdoor operations.

Claims

1. A core multi-physical parameter acquisition device, characterized in that: The invention comprises an outer cylindrical body and an inner cylindrical body (1) arranged inside and outside, a clamping device (4) arranged inside the inner cylindrical body (1) for clamping a rock core, a length adjustment device (5) arranged outside the inner cylindrical body (1) and moving along the length direction of the inner cylindrical body (1), a sensor device arranged inside the inner cylindrical body (1), a cylinder cover arranged at both ends of the length adjustment device (5), and a circular patch (52) arranged on the inner wall of the cylinder cover, wherein both the outer cylindrical body and the inner cylindrical body (1) can be opened, and the cylinder cover matches the inner diameter of the inner cylindrical body (1); The inner cylinder (1) is made of a non-metallic insulating material; the two ends of the length adjustment device (5) can extend outward or retract inward, so that the cylinder cover can extend outward or retract inward along with the length adjustment device (5); the sensing device is used to detect one or more parameters of the core such as magnetic susceptibility, resistivity, density, mass, temperature, humidity and P-wave velocity; The inner cylinder (1) is made of tempered glass or rubber. The inner cylinder (1) comprises an upper semi-cylinder (61) and a lower semi-cylinder (62). The upper semi-cylinder (61) and the lower semi-cylinder (62) are movably connected via a hinge (7). The clamping device (4) comprises a plurality of clamping assemblies circumferentially arranged in the inner cylinder (1), each clamping assembly comprising a first drive device, a telescopic rod (42) connected to an output end of the first drive device, and a clamping body (41) correspondingly connected to a free end of each telescopic rod (42), the clamping body (41) being in contact with the core, and all the first drive devices are connected to a control switch; The clamping assembly comprises three groups, the clamping body (41) is arc-shaped or sheet-shaped, a buffer layer (43) is provided at the contact point between the clamping body (41) and the rock core, and the first driving device is a driving motor; The length adjustment device (5) comprises a slideway (53) axially arranged on the outer wall of the inner cylinder (1), a second driving device arranged in the slideway (53), a sliding rod (51) slidably matched with the slideway (53) and bidirectionally connected to the second driving device, a transition rod (54) correspondingly connected to the sliding rod (51), and the transition rod (54) movably connected to the cylinder cover; The transition rod (54) is an L-shaped transition rod, the cylinder cover comprises a left cylinder cover (91) and a right cylinder cover (92), and the transition rod (54) is movably connected to the left cylinder cover (91) and the right cylinder cover (92) via a buckle; The sensing device comprises a weight sensor (81), a temperature sensor (82), a humidity sensor (83), a P-wave velocity sensor (84), a resistivity sensor (85), and a magnetic susceptibility sensor (86), wherein: The weight sensor (81) is arranged in the lower semi-cylinder (62); The temperature sensor (82) and the humidity sensor (83) are arranged at the bottom end of the inner wall of the lower semi-cylinder (62); A P-wave velocity sensor (84) is arranged in the middle of each circular patch (52), and two P-wave velocity sensors (84) are connected via a wire; The resistivity sensor (85) is arranged on each circular patch (52) and is located on the outer ring of the P-wave velocity sensor (84), and the two resistivity sensors (85) are connected via a wire; The magnetic susceptibility sensors (86) are located at two ends of the inner wall of the upper semi-cylinder (61), and the two magnetic susceptibility sensors (86) are located between the two circular patches (52); A ring-wire barrier line (10) is also provided on the circular patch (52), and the ring-wire barrier line (10) is located between the P-wave velocity sensor (84) and the resistivity sensor (85).

2. A method for measuring multiple physical parameters of a core, using the device for acquiring multiple physical parameters of a core according to claim 1, characterized in that: The measurement method includes the following steps: Step 1: Pre-process the core to be tested and grind both ends of the core flat; Step 2: Open the outer cylinder and the inner cylinder (1) in sequence, place the core to be tested into the inner cylinder (1), and then close the inner cylinder (1); Step 3: Turn on the control switch of the first driving device in the clamping device (4), and fix and clamp the core through the clamping device (4); Step 4: Turn on the switch of the second driving device in the length adjustment device (5), and according to the length of the core, the left cylinder cover (91) and the right cylinder cover (92) extend outward or retract inward as the sliding rod (51) moves, thereby fixing the two ends of the core, so that the P-wave velocity sensor (84) and the resistivity sensor (85) on the circular patch (52) are tightly coupled with the end of the core; Step 5: Close the outer cylinder, start the instrument switch, and measure the core data through the external control software of the instrument, and measure the core density, resistivity, P-wave velocity and magnetic susceptibility parameter information in turn; Step 6: Density measurement: the weight of the core is obtained by the weight sensor (81), and the length of the core is obtained by the displacement of the sliding rod (51); the core is clamped by the clamping device (4) and the diameter of the core is obtained, the length and diameter of the core are accurately obtained, and the volume of the core is further obtained, thereby obtaining the density information of the core; Step 7: Resistivity measurement: the resistivity sensors (85) on the circular patches (52) at both ends of the core are connected to each other through wires, and then a certain voltage is applied. Then, the resistivity information is calculated based on the information of voltage, current and resistance. At the same time, the current humidity value and temperature value are recorded through the temperature sensor (82) and the humidity sensor (83); Step 8: P-wave velocity measurement: P-wave velocity sensors (84) at both ends of the core are connected via wires, a high-voltage pulse signal is sent from one end of the core, and the other end of the core receives the high-voltage pulse signal, and the P-wave velocity information is calculated based on the receiving time and the core length; Step 9: Magnetic susceptibility measurement: a magnetic field is applied inside the inner cylinder (1), and the magnetic susceptibility sensors (86) at both ends obtain magnetic force, and magnetic susceptibility information is obtained through magnetic moment; Step 10: After the parameter measurement is completed, the density, resistivity, velocity and magnetic susceptibility information of the core are displayed according to the depth information through the external control software.

3. The method for measuring multiple physical parameters of a core according to claim 2, characterized in that: The magnetic susceptibility sensor (86) is symmetrically located at the top of the inner wall of the upper semi-cylinder (61).

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