Flap Valve Magnetic Closing Performance Testing Equipment and Testing Method

Abstract

The present invention relates to a magnetic closing performance testing device and method for a flap valve, including a valve seat fixing mechanism for fixing a valve seat, a core barrel driving mechanism for driving a core barrel to lift and lower, a first magnetic member for providing an initial closing force to a valve flap, and a magnet linear displacement adjusting mechanism connected to the first magnetic member for adjusting the distance between the first magnetic member and the valve seat. In the present invention, the spring that provides the initial closing force to the valve flap is replaced with a magnet. The repulsive force generated by the repulsion of magnets is much greater than the elastic force generated by the spring. When the drill rig drills horizontally or vertically upward, the elastic potential energy of the spring is not sufficient to provide enough energy for the valve flap to overcome the friction or gravity and rotate to close. Since the valve flap is limited by the core barrel, the energy generated by the magnetic potential energy accumulates. Therefore, after losing the limitation of the core barrel, this energy will be completely converted into the kinetic energy of the valve flap, enabling the valve flap to obtain a large amount of kinetic energy, thereby ensuring that it quickly closes against gravity or friction and preventing tipping over.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure-holding coring experimental devices, and particularly to a testing device and method for the magnetic closing performance of a flap valve. Background Art

[0002] The physical, mechanical, chemical, and biological properties of deep rocks are closely related to the in-situ environmental conditions they are in. The loss of the in-situ environment during the coring process will cause the physical and chemical properties and mechanical properties of the core to be distorted and irreversible. The core and key to tackling this problem is how to obtain the in-situ core under deep environmental conditions and conduct real-time loading tests and analyses in an in-situ fidelity state.

[0003] Current in-situ fidelity coring devices use drill tools to drill cores and then store the cores in a fidelity chamber, and then use a pressure-holding control device in the fidelity chamber to perform pressure-holding and sealing on the samples.

[0004] The pressure-holding control device of the fidelity chamber includes a pressure-holding valve, such as a ball valve and a flap valve. When the core barrel is lifted to a certain height, the flap valve can automatically close. Currently, the closing of the flap valve mainly relies on elastic force triggering. Elastic force triggering can only be applied during vertical drilling, and there are problems such as seal failure caused by the side turning of the valve flap.

[0005] Patent document CN110847856A discloses a magnetic-triggered flap valve structure for a pressure-holding corer. A magnetic part is provided on the valve seat of the flap valve structure of the pressure-holding corer, and a magnetic material is provided on the valve flap. Theoretically, the valve flap can be magnetically attracted by the valve seat without external force and then achieve automatic closing. However, this magnetic flap valve is still in the theoretical stage, and its pressure-holding performance needs to be verified and improved. Summary of the Invention

[0006] The present invention provides a testing device and method for the magnetic closing performance of a flap valve to solve the above technical problems.

[0007] The present invention is achieved through the following technical solutions:

[0008] A testing device for the magnetic closing performance of a flap valve includes a valve seat fixing mechanism for fixing the valve seat, a core barrel driving mechanism for driving the core barrel to move up and down, a first magnetic part for providing an initial closing force to the valve flap, and a magnet linear displacement adjusting mechanism connected to the first magnetic part for adjusting the distance between the first magnetic part and the valve seat.

[0009] Furthermore, the testing device for the magnetic closing performance of a flap valve further includes a platform with adjustable inclination, and the valve seat fixing mechanism, the core barrel driving mechanism, and the magnet linear displacement adjusting mechanism are installed on the platform.

[0010] Furthermore, the platform includes a first base, a second base, a first rotation driving mechanism, and a second rotation driving mechanism;

[0011] The first rotation driving mechanism is connected to the first base and is used to drive the first base and the second base to rotate in the first direction;

[0012] The second base is rotatably connected to the first base; the second rotation driving mechanism is connected to the second base and is used to drive the second base to rotate relative to the first base in the second direction; the second direction is perpendicular to the first direction;

[0013] The valve seat fixing mechanism, the core barrel driving mechanism and the magnet linear displacement adjusting mechanism are installed on the second base.

[0014] Furthermore, there is a round hole on the second base that is adapted to the valve seat, and the axis of the round hole is coaxial with the rotation center of the second base.

[0015] Furthermore, the flap valve magnetic closing performance testing device further includes a box body with an observation window, and the platform is placed inside the box body.

[0016] Furthermore, the valve seat fixing mechanism includes a pair of clips and an operating mechanism. One of the pair of clips is a fixed clip, and the other is a movable clip. The operating mechanism is connected to the movable clip.

[0017] Furthermore, the flap valve magnetic closing performance testing device further includes a flap valve. The flap valve includes a valve seat and a valve flap. The valve flap is connected to one side of the top end of the valve seat;

[0018] There is a second magnetic member on the valve flap, and there is a third magnetic member on the valve seat for attracting the valve flap to close.

[0019] Furthermore, a sealing plate is connected to the bottom end of the valve seat, and there is an air injection hole on the sealing plate.

[0020] Furthermore, the flap valve magnetic closing performance testing device further includes an air injection system.

[0021] The flap valve magnetic closing performance testing method uses the described flap valve magnetic closing performance testing device.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In the present invention, the spring that provides the initial closing power for the valve flap is replaced with a magnet, which has two beneficial effects: (1) The repulsive force generated by the repulsion of magnets is much greater than the elastic force generated by the spring. That is, at the initial stage, the magnetic potential energy generated between the magnets is relatively large, while the elastic potential energy generated by the spring is relatively small. When the drill rig drills horizontally or vertically upward, the elastic potential energy of the spring is not sufficient to provide enough energy for the valve flap to overcome the frictional force or gravity and rotate to close; (2) Since the valve flap is limited by the core barrel, the energy generated by the magnetic potential energy accumulates. Therefore, after losing the limitation of the core barrel, this energy will be completely converted into the kinetic energy of the valve flap, enabling the valve flap to obtain a relatively large kinetic energy, thereby ensuring that it can overcome gravity or frictional force and close quickly to prevent tipping over.

[0024] 2. In the present invention, the inclination of the platform is adjustable, and the closing condition of the flap valve in different drilling directions can be tested; the second base can rotate relative to the first base, enabling the overall valve flap and valve seat to rotate around the axis of the valve seat. Under the combined action of the first base and the second base, tests of the valve flap at different inclination angles and different placement positions can be achieved.

[0025] 3. The present invention has an experimental function. Through different magnet experiments, the existing sizes of the valve flap magnet and the magnet inside the valve seat can be optimized;

[0026] 4. The present invention can detect the magnitude of the pre-tightening force generated by the valve seat on the valve flap, and the existing pre-tightening device in the pressure maintaining chamber can be optimized by detecting the pre-tightening force, or even the pre-tightening device can be removed. Description of the Drawings

[0027] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not constitute a limitation to the embodiments of the present invention.

[0028] Figure 1 is the three-dimensional view of the present invention;

[0029] Figure 2 is the three-dimensional view of the experimental bench inside the box;

[0030] Figure 3 is the three-dimensional view of the adjustable platform;

[0031] Figure 4 is the schematic diagram when the flap valve is tested using the present invention;

[0032] Figure 5 is the structural schematic diagram of the movable clamp and its operating mechanism;

[0033] Figure 6 is the structural schematic diagram of the magnet linear displacement adjustment mechanism;

[0034] Figure 7 is the structural schematic diagram of the second base;

[0035] Figure 8 It is a structural schematic diagram of a flap valve. Specific implementation manners

[0036] To make the objectives, 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 with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0038] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0039] It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0040] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "forward", "reverse", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present invention is normally placed, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "arranged", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0042] Embodiment 1

[0043] As Figure 1 , Figure 2 shown, the flap valve magnetic closing performance test equipment disclosed in this embodiment includes a box body 100 and a test bench. The test 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 to lift and lower.

[0044] The test bench is placed inside the box body 100, and the box body 100 has an observation window. Placing the test platform inside the box body 100 has three functions: First, it realizes the protection function. When the valve flap is closed, air pressure is used to determine its pre-tightening force. If the box body is not used, there will be certain experimental risks due to excessive air pressure. Second, it realizes the modular concealment of the control mechanism. Place various pneumatic and electric devices inside the box body 100 for encapsulation to achieve a clean and modular functional effect. Third, the test bench not only has an experimental function but also has a certain function of demonstrating the valve seat closing action. When no experiment is needed, it can realize the dynamic display of the valve flap closed state. In this function, placing the platform inside the box body 100 can prevent external interference during the dynamic display process, and a high-speed image tracking system can be integrated inside the box body 100 to collect the dynamic images during the valve flap closing process.

[0045] As Figure 2 , Figure 3 shown, to simulate situations such as vertical drilling, horizontal drilling, and inclined drilling, 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.

[0046] Rotating shafts 44 are fixedly connected to both sides of the first base 41, and the rotating shafts 44 are supported on the support seat 45 through bearings and bearing seats 46. The first rotation driving mechanism 47 is connected to one of the rotating shafts 44 for driving the first base 41 to rotate in the first direction.

[0047] The second base 42 is rotatably connected to the first base 41. The second rotation driving mechanism 43 is installed on the first base 41, and the output end of the second rotation driving mechanism 43 is connected to the second base 42 for driving the second base 42 to rotate relative to the first base 41 in the second direction. The second direction is perpendicular to the first direction.

[0048] The first rotation driving mechanism 47 and the second rotation driving mechanism 43 can 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.

[0049] The first rotation drive 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 axis of the rotating shaft 44 is perpendicular to the axis of the first handwheel 471. Therefore, 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 driven wheel. By designing an appropriate transmission ratio, the platform 4, the valve seat, and the valve flap can be rotated around the rotating shaft 44, thereby simulating situations such as vertical drilling, horizontal drilling, and inclined drilling.

[0050] The second rotation drive 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.

[0051] As Figure 7 shown, there is a circular hole 421 adapted to the valve seat on the second base 42, 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 rotation drive mechanism 43 operates, and it can drive the second base 42, the valve seat, and the valve flap to synchronously rotate around the axis of the valve seat.

[0052] The valve seat fixing mechanism 6 and the core barrel drive mechanism 5 are installed on the second base 42.

[0053] As Figure 5 shown, 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 to the movable clip 61 for controlling the movable clip 61.

[0054] A linear guide rail 66 is provided on the upper surface of the second base 42, and the movable clip 61 is slidably connected to the linear guide rail 66. The operating mechanism includes a handle 65, an arm one 63, an arm two 67, and an arm three 68. One end of the arm one 63 is connected to the movable clip 61, the other end of the arm one 63 is rotatably connected to one end of the arm two 67, the other end of the arm two 67 is rotatably connected to one end of the arm three 68, the other end of the arm three 68 is rotatably connected to the mounting seat 64, the mounting seat 64 is fixedly connected to the second base 42, and one end of the handle 65 is fixedly connected to the arm three 68.

[0055] By rotating the handle 65 forward or backward, the arm three 68 can be driven to rotate around the mounting seat 64, and then the arm one 63 and the movable clip 61 can be pulled or pushed to move linearly, realizing the adjustment of the distance between the movable clip 61 and the fixed clip 62, and then realizing the clamping or loosening of the valve seat.

[0056] The core barrel driving mechanism 5 is used to lift the core barrel. The core barrel driving mechanism 5 includes a core barrel gripper 54 for gripping the core barrel and a linear driving mechanism for driving the core barrel gripper 54 to move linearly. The linear driving mechanism can be selected from a hydraulic cylinder, a pneumatic cylinder, a linear motor, etc.

[0057] In this embodiment, the linear driving mechanism is selected as a linear motor, which specifically includes a motor 51, a linear guide 52, a slider 53, a ball screw, etc. This is conventional technology in the art and will not be elaborated here. The core barrel gripper 54 is fixedly connected to the slider 53.

[0058] As Figure 3 , Figure 8 shown, the flap valve includes a valve seat 1 and a valve flap 2, and the valve flap 2 is connected to one side of the top end of the valve seat 1.

[0059] There is a second magnetic member 9 on the valve flap 2, and a third magnetic member 10 for attracting the second magnetic member 9 on the valve seat 1. In another embodiment, the third magnetic member 10 may not be provided on the valve seat 1. To facilitate testing the sealing pressure of the flap valve, a sealing plate 11 is connected to the bottom end of the valve seat 1, and an air injection hole 12 is provided on the sealing plate 11; when the valve flap is closed, air pressure can be injected into the valve seat 1 through the air injection hole 12, and by monitoring the change of the internal pressure, the maximum sealing pressure can be measured.

[0060] To provide an initial closing force for the valve flap 2, a first magnetic member 8 with adjustable position and a magnet linear displacement adjustment mechanism 7 for linearly adjusting the position of the first magnetic member 8 are also installed on the second base 42. By adjusting the position of the first magnetic member 8, the repulsive force on the second magnetic member 9 is adjusted. The magnetic member can be selected as a magnet, such as a permanent magnet. The second magnetic member 9 can be embedded in the valve flap 2.

[0061] As a better choice: The valve flap 2 is made of a paramagnetic material with high magnetic permeability and high compressive strength. The reason is that by using a paramagnetic material to make the valve flap 2, the permanent magnet on the valve flap 2 will magnetize the valve flap 2. After the valve flap 2 is closed, the magnetic potential of the permanent magnet inside the valve seat 1 will be coupled with the magnetic potential of the valve flap 2. According to the principle of minimum potential energy, it will have a greater attractive force, thus overcoming the gravitational potential and achieving the effect of continuous closing. In the embodiment, iron is selected to make the valve flap 2, while 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 low magnetic permeability material, and the magnetic field inside it will not generate a magnetic potential, so it will not affect the closing trajectory of the valve flap 2.

[0062] As Figure 3 , Figure 4 shown, 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 an electric, pneumatic, or hydraulic mechanism.

[0063] AsFigure 6 As shown in the figure, in this embodiment, the magnet linear displacement adjusting mechanism 7 is a manual mechanism. The magnet linear displacement adjusting 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 the linear motion of the first magnetic member 8. In this embodiment, the axis of the second handwheel 71 is perpendicular to the displacement direction of the first magnetic member 8. Therefore, the second transmission mechanism includes a worm and gear transmission mechanism and a lead screw and nut transmission mechanism.

[0064] The nut 75 of the lead screw and nut transmission mechanism is slidably connected to the second base 42. The magnet mounting seat 77 is connected to the nut 75 through a guide rod 76. The first magnetic member 8 is mounted on the magnet mounting seat 77. A pressure sensor 78 is provided between the first magnetic member 8 and the magnet mounting seat 77. The magnet mounting seat 77 is slidably connected to the second base 42. Its working principle is as follows:

[0065] (1), Manually rotate the second handwheel 71 to drive the worm 72 to drive the turbine 73 to rotate vertically;

[0066] (2), The turbine 73 is on the lead screw 74, and the rotating lead screw 74 drives the nut 75 to move linearly;

[0067] (3), The nut 75 transfers the motion to the magnet mounting seat 77, the pressure sensor 78 and the first magnetic member 8 through the guide rod 76;

[0068] (4), When the first magnetic member 8 encounters the second magnetic member 9 on the valve flap, because the second magnetic member 9 and the first magnetic member 8 are opposite poles, when the same pole magnets repel, a pressure will be generated on the pressure sensor 78, and the magnitude of the repulsive force can be measured through the pressure sensor 78.

[0069] By measuring the repulsive force, the initial acceleration can be determined, so as to establish the dynamic model of the valve flap closing and study the instantaneous motion state during the rotation and closing process of the valve flap; moreover, measuring the repulsive force can be compared with the elastic force generated by the existing spring trigger model, and the size of the existing magnet can be optimized by back-calculating according to the dynamic model.

[0070] To realize the test of the sealing pressure, the flap valve magnetic closing performance test equipment further includes an air injection system for injecting gas into the closed flap valve. The air injection system includes an air pressure pump, an air injection pipe and a pressure valve. The air injection pipe is used for sealing connection with the air 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.

[0071] A control system is provided on the box body 100. The control system includes a controller and a human-computer interaction module 101. The second rotation drive mechanism 43, the core barrel drive mechanism 5 and the air injection system are all connected to the control system.

[0072] The control system can reduce the number of manual operations. By adopting human-machine interaction, it realizes artificial intelligence operation, which is convenient and fast, and reduces the 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 the monitoring of the lifting and lowering speed; controlling the first base 41 and the valve seat and valve flap to rotate freely 360° around the valve seat axis, monitoring the closing condition of the valve flap at different positions, and enabling the control and monitoring of the rotation angle; after the flap valve is closed, it can realize the pre-tightening force test, control the air pressure size by using the human-machine interaction module, and realize real-time monitoring.

[0073] The control of the lifting and lowering of the core barrel depends on the core barrel driving mechanism 5. By controlling the speed of the motor 51, the lifting and lowering speed of the core barrel can be controlled; naturally, through the rotation speed of the motor, the lifting and lowering speed of the core barrel can be monitored.

[0074] By adjusting the lifting and lowering speed of the core barrel, the extraction speed of the on-site core barrel can be simulated as realistically as possible; in addition, through experiments, it can also be determined whether there is an optimal lifting speed.

[0075] The usage method of the present invention:

[0076] 1. Initial state: As Figure 3 、 4 shown, 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 gripper 54; in the initial state, the core barrel 3 is located inside the valve seat 1, and the valve flap 2 of the flap valve is in the open state. At this time, the first magnetic member 8 will give an initial power to the valve flap 2, and this initial power can be measured by the corresponding pressure sensor 78.

[0077] 2. Initial experiment: Make the valve seat 1 axially perpendicular to the horizontal plane, and the core barrel driving mechanism 5 operates to lift the core barrel 3. When the core barrel 3 is removed from the valve seat 1 and passes over the valve flap 2; the valve flap 2 makes a variable acceleration movement under the repulsive force of the first magnetic member 8 to realize rotational closing. At this time, the normal vertical coring state is simulated;

[0078] 3. Readjust to the initial state, rotate the first handwheel 471 to make a certain angle between the axis of the valve seat 1 and the horizontal plane, use the control system to rotate the second base 42 by a certain angle. At this time, the core barrel driving mechanism 5 operates to lift the core barrel 3. When the core barrel 3 is removed from the valve seat 1, if the valve flap 2 can realize the rotational closing power process at different angles, it indicates that the rotational closing experiment is successful.

[0079] After the valve flap 2 closes, the third magnetic part 10 on the valve seat 1 will generate a pre-tightening force on the valve flap 2, so as to make the valve flap 2 produce a tight closing effect. At this time, through the human-machine interaction module 101, gas is filled into the valve seat 1, and the air pressure is monitored by a pressure gauge. At this time, the real-time state 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 peak value of the air pressure and the change law of the process.

[0080] The peak value of the air pressure inside the valve seat 1 is the pre-tightening force generated by the third magnetic part 10 on the valve seat 1 on the valve flap 2, which is called the initial pre-tightening force. When the generated initial pre-tightening force is relatively large, the valve flap will have a certain pressure-holding ability to achieve the pressure-holding effect after closing.

[0081] Embodiment 2

[0082] The difference between this embodiment and Embodiment 1 is that in this embodiment, the first base 41 and the second base 42 are disc-shaped. The first base 41 and the second base 42 are arranged in parallel. Two rotating shafts 44 are radially arranged on opposite sides of the first base 41.

[0083] The support seat 45 is a vertically arranged plate, and the bearing seat 46 is installed on the top of the support seat 45.

[0084] In the present invention, the spring that provides the initial closing power for the valve flap is replaced with a magnet. The repulsive force generated by the repulsion of the magnets is much greater than the elastic force generated by the spring. That is, at the initial stage, the magnetic potential energy generated between the magnets is relatively large. When the drill rig drills horizontally or vertically upward, it can provide enough energy to make the valve flap rotate and close against friction or gravity; in addition, the energy generated by the magnets is large enough, so that the rotation speed of the valve flap is relatively large after losing the limit of the core barrel, thus ensuring its rapid closing and preventing the valve flap from tipping over.

[0085] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. The magnetic closing performance testing device for a flap valve is characterized in that: It includes a valve seat fixing mechanism for fixing the flap valve seat, a core barrel driving mechanism for driving the core barrel to lift and lower, a first magnetic member for providing initial closing power to the flap valve disc, and a magnet linear displacement adjusting mechanism connected to the first magnetic member; There is a second magnetic member on the valve disc. The magnet linear displacement adjusting mechanism is used to linearly adjust the position of the first magnetic member, and by adjusting the position of the first magnetic member, the repulsive force on the second magnetic member is adjusted accordingly; It further includes a platform with adjustable inclination. The valve seat fixing mechanism, the core barrel driving mechanism, and the magnet linear displacement adjusting mechanism are installed on the platform; The valve seat fixing mechanism includes a pair of clips and an operating mechanism. One of the pair of clips is a fixed clip, and the other is a movable clip. The operating mechanism is connected to the movable clip.

2. The magnetic closing performance testing device for a flap valve according to claim 1, characterized in that: The platform includes a first base, a second base, a first rotation driving mechanism, and a second rotation driving mechanism; The first rotation driving mechanism is connected to the first base and is used to drive the first base and the second base to rotate in a first direction; The second base is rotatably connected to the first base. The second rotation driving mechanism is connected to the second base and is used to drive the second base to rotate relative to the first base in a second direction; the second direction is perpendicular to the first direction; The valve seat fixing mechanism, the core barrel driving mechanism, and the magnet linear displacement adjusting mechanism are installed on the second base.

3. The magnetic closing performance testing device for a flap valve according to claim 2, characterized in that: There is a circular hole on the second base that is adapted to the valve seat, and the axis of the circular hole is coaxial with the rotation center of the second base.

4. The magnetic closing performance testing device for a flap valve according to claim 1, characterized in that: It further includes a box body with an observation window, and the platform is placed inside the box body.

5. The magnetic closing performance testing device for a flap valve according to any one of claims 1 - 4, characterized in that: There is a third magnetic member on the valve seat for attracting the valve disc to close.

6. The magnetic closing performance testing device for a flap valve according to claim 5, characterized in that: A sealing plate is connected to the bottom end of the valve seat, and there is an air injection hole on the sealing plate.

7. The magnetic closing performance testing device for a flap valve according to claim 6, characterized in that: It further includes an air injection system.

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