CN112945545B - Magnetic closure experimental method for flap valve - Google Patents

Abstract

The invention relates to a flap valve closing test method. A sealing plate with a through hole is provided at one end of the flap valve away from the valve disc; after the valve disc is closed, medium is injected into the flap valve through the through hole, and the flap is monitored at the same time. Pressure changes inside the valve. The present invention tests the initial pre-tightening force of the flap valve, which can more comprehensively evaluate and verify the sealing performance of the magnetic flap valve, and is conducive to improving the flap valve; the present invention provides a spring that provides initial closing power to the valve disc. Replacing it with a magnetic piece can allow the valve disc to obtain greater kinetic energy, thereby ensuring that it can quickly close against gravity or friction and prevent rollover; the present invention tested the performance of the flap valve in different drilling directions and when the valve disc is in different positions. In the closed state, the sealing performance of the flap valve can be tested in vertical drilling, horizontal drilling, inclined drilling, etc., providing more comprehensive data support for the design and improvement of pressure-maintaining coring devices, and facilitating the transition from the theoretical stage to practice. Exploration conversion.

Description

Experimental method for magnetic closure of flap valve

Technical field

The invention relates to the technical field of pressure-maintaining coring experimental devices, and in particular to a flap valve closure test method.

Background technique

The physical, mechanical, chemical and biological properties of deep rocks are closely related to the in-situ environmental conditions in which they are located. The loss of the in-situ environment during the coring process will cause the physical, chemical and mechanical properties of the core to be distorted and irreversible. The core and key to this problem is how to Obtain in-situ cores under deep environmental conditions, and perform real-time loading testing and analysis under in-situ fidelity.

The current in-situ fidelity coring device uses a drilling tool to drill the core and then stores the core in a fidelity cabin, and then uses the fidelity cabin pressure control device to maintain pressure and seal the sample.

The pressure maintaining control device of the fidelity cabin includes a pressure maintaining valve, which includes a ball valve, a flap valve, etc. When the core barrel is raised to a certain height, the flap valve can automatically close. At present, the closure of the flap valve mainly relies on elastic triggering.

Patent document CN110847856A discloses a magnetically triggered pressure-maintaining corer flip valve structure. The valve seat of the pressure-maintaining corer flip valve structure is provided with a magnetic component, and the valve disc is provided with magnetic material. Theoretically, the valve disc can be magnetically attracted by the valve seat without external force, and then automatically close. However, this magnetic flap valve is still in the theoretical stage, and its pressure-holding performance needs to be verified and improved.

The sealing test of the existing pressure-maintaining coring experimental device usually tests the pressure-maintaining performance of the pressure-maintaining chamber and the pressure-resistant performance of the flap valve, such as patent documents CN110736594A and CN210513039U. The existing technology does not test the initial pre-tightening force of the flap valve, making it difficult to comprehensively evaluate and verify the sealing performance of the flap valve, which is not conducive to the improvement of the flap valve.

Contents of the invention

In order to solve the above technical problems, the present invention provides a flap valve closing test method.

The present invention is realized through the following technical solutions:

In the flap valve closing test method, a sealing plate with a through hole is provided at the end of the flap valve away from the valve disc; after the valve disc is closed, medium is injected into the flap valve through the through hole, and at the same time, the internal conditions of the flap valve are monitored. Pressure changes.

Further, a second magnetic component is provided on the valve disc, and a third magnetic component for attracting the valve disc is provided on the valve seat.

Further, the external first magnetic component generates a repulsive force on the second magnetic component to trigger the valve flap to close, and the magnitude of the magnetic force between the first magnetic component and the second magnetic component is monitored.

Alternatively, a second magnetic component is provided on the valve flap, and the external first magnetic component generates a repulsive force on the second magnetic component to trigger the valve flap to close, and the magnitude of the magnetic force between the first magnetic component and the second magnetic component is monitored.

Further, the magnitude of the magnetic force between the first magnetic component and the valve disc is adjusted by linearly moving the first magnetic component.

Preferably, the medium is gas.

Further, the flap valve closing test method includes the following steps:

S1, initial state: the core barrel is located in the valve seat, and the flap valve is open;

S2, lift the core barrel and close the valve disc;

S3, fill the inside of the flap valve with medium, monitor the internal pressure through the pressure gauge, and release the pressure when it reaches the maximum value.

Further, in S1, in the initial state, an initial closing power is given to the valve disc through the first magnetic component, and the value of the initial closing power is measured through the pressure sensor.

Further, the flap valve closure test method also includes S4, changing the inclination of the valve seat, and/or rotating the valve seat around the valve seat axis to change the position of the valve disc, and then repeating S1-S3.

Further, in the flap valve closing test method, the valve seat is installed on the second base, and the second base is rotationally installed on the first base. The first base can rotate in the first direction, and the second base is rotatable in the first direction. The two bases can rotate in a second direction relative to the first base, and the second direction is perpendicular to the first direction;

The inclination of the valve seat is adjusted by rotating the first base, and the position of the valve disc is changed by rotating the second base relative to the first base.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention tests the initial pre-tightening force of the flap valve, which can more comprehensively evaluate and verify the sealing performance of the magnetic flap valve, and is conducive to improving the flap valve;

2. The present invention replaces the spring that provides the initial closing power for the valve disc with a magnetic component, which has two beneficial effects: (1) The repulsive force generated by the mutual repulsion of the magnets is much greater than the elastic force generated by the spring, that is, in the initial stage, the mutual repulsion between the magnets The magnetic potential energy generated during the drilling is relatively large, while the elastic potential energy generated by the spring is small. When the drilling rig drills horizontally or vertically upward, the elastic potential energy of the spring is not enough to provide enough energy to allow the valve disc to overcome friction or gravity to rotate and close. ; (2) Since the valve disc is limited by the core barrel, the energy generated by the magnetic potential energy accumulates. Therefore, after losing the core barrel limit, this energy will be completely converted into the kinetic energy of the valve disc, allowing the valve disc to obtain greater kinetic energy, thus Ensure that it closes quickly against gravity or friction to prevent rollover;

3. The present invention tests the closing conditions of the flap valve when the valve disc is in different positions and in different drilling directions. It can test the sealing performance of the flap valve in vertical drilling, horizontal drilling, inclined drilling, etc., as The design and improvement of the pressure-maintaining coring device provide more comprehensive data support and facilitate the transformation from the theoretical stage to actual exploration;

4. The present invention can detect the pre-tightening force generated by the valve seat on the valve disc, and can optimize the pre-tightening device in the existing fidelity cabin by detecting the pre-tightening force, and even eliminate the pre-tightening device.

Description of the drawings

The drawings described here are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation to the embodiments of the present invention.

Figure 1 is a three-dimensional diagram of the present invention;

Figure 2 is a three-dimensional view of the experimental bench inside the box;

Figure 3 is a three-dimensional view of the adjustable platform;

Figure 4 is a schematic diagram when testing the flap valve using the present invention;

Figure 5 is a schematic structural diagram of the movable clip and its operating mechanism;

Figure 6 is a schematic structural diagram of the magnet linear displacement adjustment mechanism;

Figure 7 is a schematic structural diagram of the second base;

Figure 8 is a schematic structural diagram of the flap valve.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of them. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of embodiments of the invention provided in the appended drawings is not intended to limit the scope of the claimed invention, but rather to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

It should be noted that, as long as there is no conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

It should be noted that similar reference numerals and letters represent similar items in the following figures, therefore, once an item is defined in one figure, it does not need further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "forward", "reverse", etc. is based on the orientation or positional relationship shown in the drawings, or is the usual position when using the product of the invention. The orientation or positional relationship, or the orientation or positional relationship commonly understood by those skilled in the art, is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation. Specific orientations of construction and operation are therefore not to be construed as limitations of the invention. In addition, the terms "first", "second", etc. are only used to differentiate descriptions and are not to be understood as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise clearly stated and limited, the terms "set", "installation", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the flap valve closing test method disclosed by the invention, a sealing plate with a through hole is provided at the end of the flap valve away from the valve disc; after the valve disc is closed, medium is injected into the flap valve through the through hole, and the flap valve is monitored at the same time Internal pressure changes. The control system can automatically record the peak value of air pressure and the process change pattern.

The peak value of the internal air pressure of the flap valve is the initial pre-tightening force of the valve disc. When the initial pre-tightening force generated is large, the valve disc will generate a certain pressure-holding capacity to achieve the pressure-maintaining effect after closing.

The method of the invention can verify the initial pre-tightening force of existing elastically triggered flip valves and magnetically triggered flip valves.

If it is an existing elastic-triggered flap valve, the initial preload force generated by the self-weight of the valve disc can be verified.

If it is an existing magnetically triggered flip valve, the initial pre-tightening force exerted on the valve disc by the magnetic component on the valve seat can be verified.

Based on the above flap valve closing test method, the present invention discloses an embodiment.

Embodiment 1

The flap valve closure test method of this embodiment is implemented by relying on the flap valve closure test equipment.

As shown in Figures 1 and 2, the flap valve closure test equipment includes a box 100 and a test bench. The experimental bench includes a platform 4, a valve seat fixing mechanism 6 for fixing the valve seat, and a core barrel driving mechanism 5 for driving the core barrel up and down.

The experimental bench is placed in the box 100, and the box 100 has an observation window. The experimental platform is placed in the box 100 and has three functions: first, to realize the protection function. When the valve disc is closed, air pressure is used to determine its pretightening force. If the box is not used, excessive air pressure will cause certain experiments. dangerous; secondly, the modular hiding of the control mechanism is realized, and each pneumatic and electric device is placed and packaged in the box 100 to achieve a clean and functional modular effect; thirdly, the test bench not only has experimental functions, but also has certain The valve seat closing action display function can realize the dynamic display of the valve disc closing state when no experiment is required. Under this function, the platform is placed in the box 100 to prevent external interference during the dynamic display process. In addition, a high-speed image tracking system can be integrated into the box 100 to realize dynamic image collection during the closing process of the valve disc.

As shown in Figures 2 and 3, in order to simulate vertical drilling, horizontal drilling, inclined drilling, etc., the inclination of the platform 4 in this embodiment is adjustable. The platform 4 specifically includes a first base 41 , a second base 42 , a first rotation driving mechanism 47 and a second rotation driving mechanism 43 .

The rotating shaft 44 is fixed on both sides of the first base 41 , and the rotating shaft 44 is supported on the supporting seat 45 through bearings and bearing seats 46 . The first rotation driving mechanism 47 is connected to one of the rotation shafts 44 and is used to drive the first base 41 to rotate in the first direction.

The second base 42 is rotationally connected to the first base 41. The second rotation drive mechanism 43 is mounted on the first base 41. The output end of the second rotation drive mechanism 43 is connected to the second base 42 for driving the second base 42. The second base 42 rotates in the second direction relative to the first base 41 . The second direction is perpendicular to the first direction.

The first rotation driving mechanism 47 and the second rotation driving mechanism 43 may be manual mechanisms or electric mechanisms. In this embodiment, the first rotation driving mechanism 47 is a manual mechanism, and the second rotation driving mechanism 43 is an electric mechanism.

The first rotation driving mechanism 47 includes a first handwheel 471 and a first transmission mechanism. The first transmission mechanism converts the rotational motion of the first handwheel 471 into the rotational motion of the rotating shaft 44 and the first base 41 . In this embodiment, the rotation axis 44 is perpendicular to the axis of the first handwheel 471, so the first transmission mechanism is a vertical transmission mechanism, and specifically a bevel gear vertical transmission mechanism can be selected. The first handwheel 471 is the driving wheel, and the first transmission mechanism is the passive wheel. By designing an appropriate transmission ratio, the platform 4, valve seat and valve disc can be rotated around the rotation axis 44, thereby simulating vertical drilling, horizontal drilling, Inclined drilling, etc.

The second rotation driving mechanism 43 includes a motor and a gear transmission mechanism. The gear transmission mechanism converts the rotational motion of the motor into the rotational motion of the second base 42 .

As shown in FIG. 7 , the second base 42 has a circular hole 421 that matches the valve seat, and the axis of the circular hole 421 is coaxial with the rotation center of the second base 42 . When the flap valve is installed on the second base 42, the second rotational driving mechanism 43 operates to drive the second base 42, the valve seat and the valve disc to rotate around the axis of the valve seat synchronously.

The valve seat fixing mechanism 6 and the core barrel driving mechanism 5 are installed on the second base 42.

As shown in FIG. 5 , the valve seat fixing mechanism 6 includes a pair of clips and an operating mechanism. One of the pair of clips is a fixed clip 62 and the other is a movable clip 61 . The operating mechanism is connected with the movable clip 61 and used to operate the movable clip 61 .

A linear guide rail 66 is provided on the upper surface of the second base 42 , and the movable clip 61 is slidingly connected to the linear guide rail 66 . The operating mechanism includes a handle 65, arm one 63, arm two 67, and arm three 68. One end of arm one 63 is connected to the movable clamp 61, and the other end of arm one 63 is rotationally connected to one end of arm two 67. The other end of arm two 67 One end of the arm three 68 is rotatably connected, the other end of the arm three 68 is rotatably connected to the mounting base 64, the mounting base 64 is fixedly connected to the second base 42, and one end of the handle 65 is fixedly connected to the arm three 68.

By rotating the handle 65 in the forward or reverse direction, the arm three 68 can be driven to rotate around the mounting base 64, and then the arm one 63 and the movable clamp 61 can be pulled or pushed to move linearly to adjust the distance between the movable clamp 61 and the fixed clamp 62, thereby realizing the clamping. Tighten or loosen the valve seat.

The core barrel driving mechanism 5 is used to lift the core barrel. The core barrel driving mechanism 5 includes a core barrel holder 54 for clamping the core barrel and a linear drive mechanism for driving the core barrel holder 54 to move linearly. The linear drive mechanism can choose hydraulic cylinder, air cylinder, linear motor, etc.

In this embodiment, a linear motor is selected as the linear drive mechanism, which specifically includes a motor 51, a linear guide rail 52, a slider 53, a ball screw, etc. This is a conventional technology in this field and will not be described in detail here. The core barrel holder 54 is fixedly connected to the slider 53 .

As shown in Figures 3 and 8, the flap valve includes a valve seat 1 and a valve disc 2. The valve disc 2 is connected to one side of the top of the valve seat 1.

The valve disc 2 is provided with a second magnetic component 9 , and the valve seat 1 is provided with a third magnetic component 10 for attracting the second magnetic component 9 . In another embodiment, the third magnetic component 10 may not be provided on the valve seat 1 . In order to facilitate testing of the sealing pressure of the flip valve, a sealing plate 11 is connected to the bottom end of the valve seat 1, and there is an air injection hole 12 on the sealing plate 11; when the valve disc is closed, air pressure can be injected into the valve seat 1 through the air injection hole 12. By monitoring changes in internal pressure, the maximum sealing pressure can be tested.

In order to provide an initial closing force for the valve disc 2, the second base 42 is also equipped with an adjustable first magnetic component 8, and a magnet linear displacement adjustment mechanism 7 for linearly adjusting the position of the first magnetic component 8. By adjusting the position of the first magnetic component 8, the repelling force of the first magnetic component 8 to the second magnetic component 9 is adjusted. Magnetic parts can choose magnets, such as permanent magnets. The second magnetic component 9 can be embedded in the valve disc 2 .

As a better choice: Valve disc 2 is made of paramagnetic material with high magnetic permeability and high compressive strength. The reason is that paramagnetic materials are used to make the valve disc 2. The permanent magnet on the valve disc 2 will magnetize the valve disc 2. After the valve disc 2 is closed, the magnetic potential of the permanent magnet inside the valve seat 1 will be equal to that of the valve disc 2. The magnetic potential coupling, according to the principle of minimum potential energy, will give it a greater attractive force, thereby overcoming the gravitational potential and achieving a continuous closing effect. In the embodiment, iron is selected to make the valve disc 2, and the valve seat 1 is made of stainless steel. The reason for choosing stainless steel to make the valve seat 1 is that stainless steel is a material with low magnetic permeability, and its internal magnetic field will not generate a magnetic potential on it, which will not affect the closing trajectory of the valve disc 2.

As shown in FIGS. 3 and 4 , the magnet linear displacement adjustment mechanism 7 is installed on the surface of the second base 42 . The magnet linear displacement adjustment mechanism 7 can be a manual mechanism, or an automatic mechanism such as electric, pneumatic, or hydraulic.

As shown in Figure 6, the magnet linear displacement adjustment mechanism 7 in this embodiment is a manual mechanism. The magnet linear displacement adjustment mechanism 7 includes a second handwheel 71 and a second transmission mechanism. The second transmission mechanism converts the rotational motion of the second handwheel 71 into linear motion of the first magnetic component 8 . In this embodiment, the axis of the second handwheel 71 is perpendicular to the displacement direction of the first magnetic component 8, so the second transmission mechanism includes a worm gear transmission mechanism and a screw nut transmission mechanism.

The nut 75 of the screw nut transmission mechanism is slidingly connected to the second base 42. The magnet mounting seat 77 is connected to the nut 75 through the guide rod 76. The first magnetic component 8 is installed on the magnet mounting seat 77. The first magnetic component 8 is connected to the magnet. A pressure sensor 78 is disposed between the mounting seats 77 , and the magnet mounting seat 77 is slidingly connected to the second base 42 . Here's how it works:

(1), manually turn the second handwheel 71, and the driving worm 72 drives the turbine 73 to rotate vertically;

(2), the turbine 73 is on the screw rod 74, and the rotating screw rod 74 drives the nut 75 to move linearly;

(3), the nut 75 transmits the motion to the magnet mounting base 77, the pressure sensor 78 and the first magnetic component 8 through the guide rod 76;

(4) When the first magnetic element 8 encounters the second magnetic element 9 on the valve disc, because the second magnetic element 9 and the first magnetic element 8 are opposite to each other in the same pole, the magnets of the same pole will repel each other, causing the pressure sensor 78 to repulse. Pressure will be generated, and the magnitude of the repulsive force can be measured by the pressure sensor 78 .

By measuring the repulsive force, the initial acceleration can be determined, thereby establishing a dynamic model of the valve disc closing, and studying the instantaneous motion state during the rotation and closing process of the valve disc; moreover, the measured repulsive force can be compared with the elastic force generated by the existing spring trigger model. According to The kinetic model works backwards to optimize the dimensions of existing magnets.

In order to test the sealing pressure, the flap valve closure test method also includes a gas injection system, which is used to inject gas into the closed flap valve. The gas injection system includes an air pressure pump, a gas injection pipe and a pressure valve. The gas injection pipe is used to be sealingly connected to the gas injection hole 12 at the bottom of the valve seat. The pressure valve value is converted into real-time data on the display screen through a computer.

The box 100 is provided with a control system, which includes a controller and a human-computer interaction module 101 . The second rotation driving mechanism 43, the core barrel driving mechanism 5 and the gas injection system are all connected to the control system.

The control system can reduce the number of manual operations, adopt human-computer interaction, and realize artificial intelligence operation, which is convenient and fast, and reduces experimental accuracy problems and safety risks caused by manual operations during the experiment. The functions of the control system mainly include: controlling the rapid lifting and lowering of the core barrel, and enabling monitoring of the lifting speed; controlling the first base 41 and the valve seat as a whole to freely rotate 360° around the valve seat axis, and monitoring the valve closing at different positions. The control and monitoring of the rotation angle can be realized according to the situation; after the flap valve is closed, the preload force test can be realized, and the human-computer interaction module is used to control the air pressure to realize real-time monitoring.

The control of the lifting of the core barrel relies on the core barrel driving mechanism 5. By controlling the speed of the motor 51, the lifting speed of the core barrel can be controlled; naturally, the lifting speed of the core barrel can be monitored by the rotation speed of the motor.

By adjusting the lifting speed of the core barrel, the extraction speed of the on-site core barrel can be simulated as realistically as possible; in addition, experiments can also determine whether there is an optimal lifting speed.

How to use this embodiment:

1. Initial state: As shown in Figures 3 and 4, the valve seat 1 of the flap valve is clamped by the fixed clamp 62 and the movable clamp 61, and the core barrel 3 is clamped by the core barrel holder 54; initial state When the core barrel 3 is located in the valve seat 1, the flap 2 of the flap valve is in an open state. At this time, the first magnetic component 8 will give an initial power to the valve flap 2, and the initial power can be measured by the corresponding pressure sensor 78.

2. Initial experiment, make the valve seat 1 axially perpendicular to the horizontal plane, operate the core barrel driving mechanism 5, and lift the core barrel 3. When the core barrel 3 moves out of the valve seat 1 and crosses the valve disc 2; the valve disc 2 is in the Under the repulsive force of a magnetic component 8, it performs a variable acceleration movement to achieve rotation and closure, which simulates the normal vertical coring state.

3. Readjust to the initial state, turn the first handwheel 471 to create a certain angle between the axis of the valve seat 1 and the horizontal plane, and use the control system to rotate the second base 42 to a certain angle. At this time, the core barrel driving mechanism 5 is running and the lift is lifted. Core barrel 3, when the core barrel 3 is moved out of the valve seat 1, if the valve disc 2 can realize the rotational closing dynamic process at different angles, it means that the rotational closing experiment is successful.

When the valve disc 2 is closed, the third magnetic component 10 on the valve seat 1 will generate a pre-tightening force on the valve disc 2, thereby causing the valve disc 2 to produce a tight closing effect. At this time, through the human-computer interaction module 101, the The valve seat 1 is filled with gas, and the air pressure is monitored through the pressure gauge. At this time, the real-time status of the air pressure will be displayed on the display screen of the control system. When the air pressure reaches the maximum value, it is depressurized, and the control system will automatically record and display the air pressure. Peak values and process change patterns.

The peak value of the internal air pressure of the valve seat 1 is the pre-tightening force generated by the third magnetic component 10 on the valve seat 1 on the valve disc 2, which is called the initial pre-tightening force. When the initial pre-tightening force generated is large, the valve disc will Produce a certain pressure-holding capacity and achieve the pressure-holding effect after closing.

The present invention replaces the spring that provides the initial closing power for the valve disc with a magnet. The repulsive force generated by the magnets is much greater than the elastic force generated by the spring. That is, the magnetic potential energy generated between the magnets in the initial stage is relatively large. When drilling horizontally on a drilling rig, When drilling or drilling vertically upward, it can provide enough energy to cause the valve disc to rotate and close against friction or gravity; in addition, the energy generated by the magnet is large enough to cause the valve disc to rotate at a high speed after losing the core barrel limit. This ensures that it closes quickly and prevents the valve disc from tipping over.

The above-described specific embodiments further describe the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above-mentioned are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. The flap valve closing test method is characterized by: including a method for testing the initial preload force of the flap valve. The method for testing the initial preload force of the flap valve includes the following steps: setting up a valve at one end of the flap valve away from the valve disc. A sealing plate with a through hole. The valve disc is connected to the top end of the valve seat. The sealing plate is connected to the bottom end of the valve seat. The sealing plate is located below the valve disc. After the valve disc is closed, medium is injected into the flap valve through the through hole. , while monitoring the pressure changes inside the flap valve. 2. The flap valve closing test method according to claim 1, characterized in that: a second magnetic component is provided on the valve disc, and a third magnetic component for attracting the valve disc is provided on the valve seat. 3. The flap valve closing test method according to claim 2, characterized in that: the external first magnetic component generates a repulsive force on the second magnetic component to trigger the valve flap to close, and the first magnetic component and the second magnetic component are repulsed. Monitor the magnetic force between magnetic parts. 4. The flap valve closing test method according to claim 1, characterized in that: a second magnetic component is provided on the valve disc, and the external first magnetic component generates a repulsive force on the second magnetic component to trigger the valve disc to close. and monitor the magnetic force between the first magnetic component and the second magnetic component. 5. The flap valve closing test method according to claim 3 or 4, characterized in that the magnetic force between the first magnetic component and the valve disc is adjusted by linearly moving the first magnetic component. 6. The flap valve closing test method according to claim 1, characterized in that: the medium is gas. 7. The flap valve closure test method according to claim 1, 2, 3, 4 or 6, characterized in that: it includes the following steps: S1, initial state: the core barrel is located in the valve seat, and the flap valve is open; S2, lift the core barrel and close the valve disc; S3, fill the inside of the flap valve with medium, monitor the internal pressure through the pressure gauge, and release the pressure when it reaches the maximum value. 8. The flap valve closing test method according to claim 7, characterized in that: in the S1, in the initial state, an initial closing power is given to the valve disc through the first magnetic component, and the initial closing power is measured through the pressure sensor. The value of the closing force. 9. The flap valve closure test method according to claim 7, characterized in that: it also includes S4, changing the inclination of the valve seat, and/or rotating the valve seat with the valve seat axis as the center to change the position of the valve disc. , and then repeat S1-S3. 10. The flap valve closure test method according to claim 9, characterized in that: the valve seat is installed on the second base, and the second base is rotationally installed on the first base, and the first The base can rotate in a first direction, the second base can rotate in a second direction relative to the first base, and the second direction is perpendicular to the first direction; The inclination of the valve seat is adjusted by rotating the first base, and the position of the valve disc is changed by rotating the second base relative to the first base.