CN112945545B - Magnetic closure experimental method for flap valve - Google Patents
Magnetic closure experimental method for flap valve Download PDFInfo
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- CN112945545B CN112945545B CN202110347365.1A CN202110347365A CN112945545B CN 112945545 B CN112945545 B CN 112945545B CN 202110347365 A CN202110347365 A CN 202110347365A CN 112945545 B CN112945545 B CN 112945545B
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 75
- 238000002474 experimental method Methods 0.000 title claims description 17
- 238000007789 sealing Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 16
- 230000008859 change Effects 0.000 claims abstract description 9
- 238000012544 monitoring process Methods 0.000 claims description 7
- 238000003556 assay Methods 0.000 claims 7
- 238000005553 drilling Methods 0.000 abstract description 17
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 230000005484 gravity Effects 0.000 abstract description 5
- 230000006872 improvement Effects 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 abstract description 2
- 230000007246 mechanism Effects 0.000 description 58
- 230000005540 biological transmission Effects 0.000 description 11
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 230000033001 locomotion Effects 0.000 description 9
- 238000006073 displacement reaction Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000006870 function Effects 0.000 description 6
- 238000011065 in-situ storage Methods 0.000 description 6
- 238000005381 potential energy Methods 0.000 description 6
- 230000001960 triggered effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000003993 interaction Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000002907 paramagnetic material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000005570 vertical transmission Effects 0.000 description 2
- 238000013473 artificial intelligence Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013383 initial experiment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention relates to a method for testing the closure property of a flap valve, wherein a sealing plate with a through hole is arranged at one end of the flap valve, which is far away from a valve clack; after the valve clack is closed, medium is injected into the flap valve through the through hole, and meanwhile, the pressure change in the flap valve is monitored. The initial pretightening force of the flap valve is tested, so that the sealing performance of the magnetic flap valve can be more comprehensively evaluated and verified, and the flap valve is improved; the spring for providing initial closing power for the valve clack is replaced by the magnetic part, so that the valve clack can obtain larger kinetic energy, and the valve clack can be ensured to be rapidly closed against gravity or friction force, and rollover is prevented; the invention tests the closing condition of the flap valve in different drilling directions and when the valve clack is positioned in different positions, can test the sealing performance of the flap valve in the conditions of vertical drilling, horizontal drilling, inclined drilling and the like, provides more comprehensive data support for the design and improvement of the pressure maintaining coring device, and is beneficial to the conversion from a theoretical stage to actual exploration.
Description
Technical Field
The invention relates to the technical field of pressure maintaining coring experiment devices, in particular to a flap valve closure experiment method.
Background
The physical mechanics, chemical biology and other characteristics of the deep rock are closely related to the in-situ environmental conditions, the in-situ environmental loss in the coring process can cause the distortion and irreversibility of the physicochemical property and mechanical property of the core, the core and key of the core are how to acquire the in-situ core under the deep environmental conditions, and the in-situ loading test and analysis are carried out in the in-situ fidelity state.
In-situ fidelity coring device, a drill is used for drilling a core, the core is stored in a fidelity cabin, and then a pressure maintaining control device of the fidelity cabin is used for pressure maintaining and sealing of a sample.
The pressure maintaining control device of the fidelity cabin comprises a pressure maintaining valve, wherein the pressure maintaining valve comprises a ball valve, a flap valve and the like. When the core barrel is lifted to a certain height, the flap valve can be automatically closed. At present, the closing of the flap valve is mainly triggered by elastic force.
Patent document CN110847856a discloses a magnetically triggered pressure maintaining core-taking flap valve structure, a magnetic member is arranged on a valve seat of the pressure maintaining core-taking flap valve structure, and a magnetic material is arranged on a valve clack. Theoretically, the valve clack can be magnetically attracted by the valve seat under the action of no external force, so that automatic closing is realized. However, the magnetic flap valve is only in the theoretical stage, and the pressure maintaining performance of the magnetic flap valve needs to be verified and improved.
The tightness test of the conventional pressure-maintaining coring experiment device is generally performed by testing the pressure maintaining performance of a pressure maintaining chamber, for example, the pressure-resisting performance of a flap valve, and the patent document CN110736594A, CN210513039U. The prior art does not test the initial pretightening force of the flap valve, is difficult to comprehensively evaluate and verify the sealing performance of the flap valve, and is not beneficial to the improvement of the flap valve.
Disclosure of Invention
The invention provides a flap valve closure experimental method for solving the technical problems.
The invention is realized by the following technical scheme:
in the experimental method of the closure property of the flap valve, a sealing plate with a through hole is arranged at one end of the flap valve far away from the valve clack; after the valve clack is closed, medium is injected into the flap valve through the through hole, and meanwhile, the pressure change in the flap valve is monitored.
Further, a second magnetic member is provided on the valve flap, and a third magnetic member for attracting the valve flap is provided on the valve seat.
Further, the first magnetic piece generates repulsive force to the second magnetic piece to trigger the valve clack to close, and the magnetic force between the first magnetic piece and the second magnetic piece is monitored.
Or the valve clack is provided with a second magnetic part, the first magnetic part outside generates repulsive force to the second magnetic part to trigger the valve clack to close, and the magnetic force between the first magnetic part and the second magnetic part is monitored.
Further, the magnetic force between the first magnetic piece and the valve clack is adjusted by linearly moving the first magnetic piece.
Preferably, the medium is a gas.
Further, the experimental method for the closure of the flap valve comprises the following steps:
s1, initial state: the core barrel is positioned in the valve seat, and the flap valve is in an open state;
s2, lifting the core barrel, and closing the valve clack;
and S3, filling medium into the flap valve, monitoring the internal pressure through a pressure gauge, and releasing pressure after the pressure reaches the maximum value.
In the step S1, in an initial state, an initial closing power is provided to the valve clack by the first magnetic element, and a value of the initial closing power is measured by the pressure sensor.
Further, the experimental method for the closure of the flap valve further comprises S4, changing the inclination of the valve seat, and/or rotating the valve seat around the axis of the valve seat to change the position of the valve clack, and repeating S1-S3.
Further, in the experimental method of the closure of the flap valve, the valve seat is arranged on the second base, the second base is rotatably arranged on the first base, the first 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 flap is changed by rotating the second base relative to the first base.
Compared with the prior art, the invention has the following beneficial effects:
1, the initial pretightening force of the flap valve is tested, so that the sealing performance of the magnetic flap valve can be more comprehensively evaluated and verified, and the flap valve is improved;
2, the invention changes the spring providing the initial closing power for the valve clack into a magnetic part, and has the beneficial effects of two aspects: (1) The repulsive force generated by the repulsion of the magnets is far greater than the elastic force generated by the springs, namely the magnetic potential energy generated between the magnets is larger in the initial stage, the elastic potential energy generated by the springs is smaller, and when the drilling machine drills horizontally or vertically upwards, the elastic potential energy of the springs is insufficient to provide enough energy to enable the valve clack to rotate to be closed against friction force or gravity; (2) Because the valve clack is limited by the core barrel, energy generated by magnetic potential energy is accumulated, and the energy is thoroughly converted into kinetic energy of the valve clack after the core barrel is lost to be limited, so that the valve clack obtains larger kinetic energy, thereby ensuring that the valve clack is rapidly closed against gravity or friction force and preventing rollover;
the sealing performance of the flap valve under the conditions of vertical drilling, horizontal drilling, inclined drilling and the like can be tested by testing the closing condition of the flap valve when the flap valve is positioned at different drilling directions and at different positions, so that more comprehensive data support is provided for the design and improvement of the pressure maintaining coring device, and the flap valve is beneficial to conversion from a theoretical stage to actual exploration;
4, the invention can detect the pretightening force of the valve seat on the valve clack, optimize the pretightening device in the existing fidelity cabin by detecting the pretightening force, and even remove the pretightening device.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention.
FIG. 1 is a three-dimensional view of the present invention;
FIG. 2 is a three-dimensional view of the laboratory bench inside the cabinet;
FIG. 3 is a three-dimensional view of an adjustable platform;
FIG. 4 is a schematic illustration of a test flap valve using the present invention;
FIG. 5 is a schematic view of the structure of the movable clamp and its operating mechanism;
FIG. 6 is a schematic structural view of a linear displacement adjustment mechanism for magnets;
FIG. 7 is a schematic view of the structure of the second base;
fig. 8 is a schematic structural view of the flap valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of 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. It will be apparent that the described embodiments are some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without collision.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, the azimuth or positional relationship indicated by the terms "forward", "reverse", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship conventionally put in place when the inventive product is used, or the azimuth or positional relationship conventionally understood by those skilled in the art, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
According to the experimental method for the closure property of the flap valve, a sealing plate with a through hole is arranged at one end of the flap valve, which is far away from the valve clack; after the valve clack is closed, medium is injected into the flap valve through the through hole, and meanwhile, the pressure change in the flap valve is monitored. The peak value of the air pressure and the change rule of the process can be automatically recorded through the control system.
The peak value of the air pressure in the flap valve is the initial pretightening force of the valve clack, and when the generated initial pretightening force is large, the valve clack can generate certain pressure maintaining capacity, so that the pressure maintaining effect after closing is realized.
The method can verify the initial pre-tightening force of the existing spring-triggered flap valve and the magnetically-triggered flap valve.
If the valve is an existing spring-triggered flap valve, the initial pretightening force generated by the dead weight of the valve clack can be verified.
If the valve is an existing magnetically triggered flap valve, the initial pretightening force of the magnetic piece on the valve seat on the valve clack can be verified.
Based on the above-mentioned flap valve closure test method, an embodiment of the present invention is disclosed.
Example 1
The experimental method for the closure of the flap valve is realized by the experimental equipment for the closure of the flap valve.
As shown in fig. 1 and 2, the flap valve closure test apparatus includes a case 100 and a test stand. The experiment table comprises a platform 4, a valve seat fixing mechanism 6 for fixing a valve seat and a core barrel driving mechanism 5 for driving the core barrel to lift.
The laboratory bench is arranged in the box 100, and the box 100 is provided with an observation window. The experimental platform was placed in the box 100 with 3 functions: firstly, realizing a protection function, when the valve clack is closed and the pretightening force is determined, adopting air pressure, if a box body is not adopted, a certain experimental danger is caused by overlarge air pressure; secondly, the modularization hiding of the control mechanism is realized, and all pneumatic and electric devices are arranged in the box body 100 to be packaged, so that the tidy and functional modularization effect is realized; thirdly, the test bed not only has experimental function, still has certain disk seat closure action show function, when not needing to carry out the experiment, can realize the valve clack closure state dynamic display, under this function, with the platform arrangement in box 100, can prevent the external interference that receives in dynamic display process, and can integrate high-speed image tracking system in the box 100, realize the dynamic image collection of valve clack closure in-process.
As shown in fig. 2 and 3, in order to simulate vertical drilling, horizontal drilling, inclined drilling, etc., the inclination of the platform 4 is adjustable in this embodiment. The platform 4 specifically includes a first base 41, a second base 42, a first rotary drive mechanism 47, and a second rotary drive mechanism 43.
The rotation shafts 44 are fixedly connected to both sides of the first base 41, and the rotation shafts 44 are supported on the support base 45 through bearings and bearing blocks 46. The first rotation driving mechanism 47 is connected to one of the rotation shafts 44, and is configured to drive the first base 41 to rotate in a first direction.
The second base 42 is rotatably connected with the first base 41, the second rotary driving mechanism 43 is mounted on the first base 41, and an output end of the second rotary driving mechanism 43 is connected with the second base 42 for driving the second base 42 to rotate in a second direction relative to the first base 41. The second direction is perpendicular to the first direction.
The first and second rotary drive mechanisms 47 and 43 may be manual or electric mechanisms. In the present embodiment, the first rotation driving mechanism 47 is a manual mechanism, and the second rotation driving mechanism 43 is an electric mechanism.
The first rotary drive mechanism 47 includes a first hand wheel 471 and a first transmission mechanism. The first transmission mechanism converts the rotational motion of the first hand wheel 471 into the rotational motion of the rotary shaft 44 and the first base 41. In this embodiment, the rotation shaft 44 is perpendicular to the axis of the first hand wheel 471, so that the first transmission mechanism is a vertical transmission mechanism, and in particular, a bevel gear vertical transmission mechanism is selected. The first hand wheel 471 is a driving wheel, the first transmission mechanism is a driven wheel, and the platform 4, the valve seat and the valve clack rotate around the rotation shaft 44 by designing a proper transmission ratio, so that the conditions of vertical drilling, horizontal drilling, inclined drilling and the like are simulated.
The second rotation driving mechanism 43 includes a motor and a gear transmission mechanism that converts the rotational movement of the motor into the rotational movement of the second base 42.
As shown in fig. 7, the second base 42 has a circular hole 421 fitted to 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 mounted on the second base 42, the second rotary drive mechanism 43 operates to drive the second base 42, the valve seat and the flap to synchronously rotate about the axis of the valve seat.
The valve seat fixing mechanism 6 and the core barrel driving mechanism 5 are mounted on the second base 42.
As shown in fig. 5, the valve seat fixing mechanism 6 includes a pair of clamps, one of which is a fixed clamp 62 and the other of which is a movable clamp 61, and an operating mechanism. The operating mechanism is connected to the movable clamp 61 for operating the movable clamp 61.
A linear guide 66 is provided on the upper surface of the second base 42, and the movable clip 61 is slidably connected to the linear guide 66. The operating mechanism comprises a handle 65, a first arm 63, a second arm 67 and a third arm 68, one end of the first arm 63 is connected with the movable clamp 61, the other end of the first arm 63 is rotationally connected with one end of the second arm 67, the other end of the second arm 67 is rotationally connected with one end of the third arm 68, the other end of the third arm 68 is rotationally connected with the mounting seat 64, the mounting seat 64 is fixedly connected with the second base 42, and one end of the handle 65 is fixedly connected with the third arm 68.
By rotating the handle 65 in the forward direction or the reverse direction, the third movable arm 68 can be driven to rotate around the mounting seat 64, and then the first arm 63 and the movable clamp 61 are pulled or pushed to linearly move, so that the distance between the movable clamp 61 and the fixed clamp 62 is adjusted, and then the valve seat is clamped or unclamped.
The core barrel driving mechanism 5 is used for lifting the core barrel. The core barrel driving mechanism 5 comprises a core barrel holder 54 for holding a core barrel and a linear driving mechanism for driving the core barrel holder 54 to linearly move. The linear driving mechanism can be a hydraulic cylinder, an air cylinder, a linear motor and the like.
The linear driving mechanism in this embodiment selects a linear motor, which specifically includes a motor 51, a linear guide rail 52, a slider 53, a ball screw, etc., which are conventional in the art and will not be described herein. The core collet holder 54 is fixedly connected with the slide 53.
As shown in fig. 3 and 8, the flap valve comprises a valve seat 1 and a valve flap 2, wherein the valve flap 2 is connected to one side of the top end of the valve seat 1.
The valve clack 2 is provided with a second magnetic element 9, and the valve seat 1 is provided with a third magnetic element 10 for attracting the second magnetic element 9. In another embodiment, the valve seat 1 may not have the third magnetic member 10. In order to test the sealing pressure of the flap valve conveniently, the bottom end of the valve seat 1 is connected with a sealing plate 11, and the sealing plate 11 is provided with an air injection hole 12; when the valve flap is closed, air pressure can be injected into the valve seat 1 through the air injection hole 12, and the maximum sealing pressure can be tested by monitoring the change of the internal pressure.
To provide an initial closing force for the flap 2, the second base 42 is further provided with a first magnetic member 8 of which the position is adjustable, and a magnet linear displacement adjustment mechanism 7 for linearly adjusting the position of the first magnetic member 8. By adjusting the position of the first magnetic member 8 and thus its repulsive force against the second magnetic member 9. The magnetic member may be a magnet, such as a permanent magnet. The second magnetic element 9 can be embedded in the valve flap 2.
As a better alternative: the valve clack 2 is made of paramagnetic material with high magnetic conductivity and high compressive strength. The reason is that: the valve clack 2 is made of paramagnetic materials, the permanent magnet on the valve clack 2 magnetizes the valve clack 2, after the valve clack 2 is closed, the magnetic potential of the permanent magnet in the valve seat 1 is coupled with the magnetic potential possessed by the valve clack 2, and the valve clack can possess a larger attractive force according to the minimum potential energy principle, so that the gravity potential is overcome, and the effect of continuous closing is achieved. In the embodiment, the valve flap 2 is made of iron, while the valve seat 1 is made of stainless steel. The reason for selecting the stainless steel to manufacture the valve seat 1 is as follows: stainless steel is a low permeability substance to which the magnetic field inside does not create a magnetic potential, so that the closed trajectory of the flap 2 is not affected.
As shown in fig. 3 and 4, the magnet linear displacement adjustment mechanism 7 is mounted on the surface of the second base 42. The magnet linear displacement adjusting mechanism 7 can be a manual mechanism or an automatic mechanism such as an electric mechanism, a pneumatic mechanism, a hydraulic mechanism and the like.
As shown in fig. 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 hand wheel 71 and a second transmission mechanism that converts the rotational movement of the second hand wheel 71 into the linear movement of the first magnetic member 8. In this embodiment, the axis of the second hand wheel 71 is perpendicular to the displacement direction of the first magnetic member 8, so that 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 in sliding connection with the second base 42, the magnet mounting seat 77 is connected with the nut 75 through the guide rod 76, the first magnetic piece 8 is mounted on the magnet mounting seat 77, the pressure sensor 78 is arranged between the first magnetic piece 8 and the magnet mounting seat 77, and the magnet mounting seat 77 is in sliding connection with the second base 42. The working principle is as follows:
(1) Manually rotating the second hand wheel 71, the driving worm 72 drives the turbine 73 to vertically rotate;
(2) The turbine 73 is arranged on the screw rod 74, and the screw rod 74 which rotates drives the nut 75 to move linearly;
(3) The nut 75 transmits the movement to the magnet mount 77, the pressure sensor 78 and the first magnetic member 8 via the guide rod 76;
(4) When the first magnetic element 8 encounters the second magnetic element 9 on the valve clack, the second magnetic element 9 is homopolar opposite to the first magnetic element 8, and when homopolar magnets repel, pressure is generated to the pressure sensor 78, and the magnitude of the repulsive force can be measured by the pressure sensor 78.
Initial acceleration can be determined by measuring repulsive force, so that a dynamic model of valve clack closing is established, and instantaneous motion state of the valve clack in the rotating and closing process is researched; moreover, measuring repulsive force can be compared with elastic force generated by the existing spring trigger model, and the size of the existing magnet is reversely optimized according to the dynamic model.
In order to realize the test of the sealing pressure, the flap valve closure experiment method also comprises an air injection system, wherein the air injection system is used for injecting air into the closed flap valve. The gas injection system comprises a pneumatic pump, a gas injection pipe and a pressure valve, wherein the gas injection pipe is used for being connected with a gas injection hole 12 at the bottom of the valve seat in a sealing way, and the value of the pressure valve is converted into real-time data on a display screen through a computer.
The box 100 is provided with a control system, and the control system comprises a controller and a man-machine interaction module 101. The second rotary driving mechanism 43, the core barrel driving mechanism 5 and the gas injection system are all connected with a control system.
The control system can reduce the number of times of manual operation, adopts man-machine interaction, realizes artificial intelligence operation, and is convenient and fast, has reduced experimental accuracy problem and the security risk that lead to because of manual operation in the experimental process. The control system mainly comprises the following functions: the rapid lifting of the core barrel is controlled, and the monitoring of the lifting speed can be realized; the first base 41 and the valve seat valve clack are controlled to freely rotate 360 degrees around the axis of the valve seat, the closing condition of the valve clack at different positions is monitored, and the control and monitoring of the rotation angle can be realized; after the flap valve is closed, the pretightening force test can be realized, and the air pressure is controlled by the man-machine interaction module, so that the real-time monitoring is realized.
The lifting speed of the core barrel can be controlled by controlling the speed of the motor 51 by depending on the core barrel driving mechanism 5; naturally, the lifting speed of the core barrel can be monitored through the rotating speed of the motor.
The lifting speed of the core barrel is regulated to simulate the pulling-out speed of the core barrel in the field as truly as possible; in addition, it can be determined experimentally whether or not there is an optimal lifting speed.
The application method of the embodiment comprises the following steps:
1, initial state: as shown in fig. 3 and 4, the valve seat 1 of the flap valve is clamped by a fixed clamp 62 and a movable clamp 61, and the core barrel 3 is clamped by a core barrel clamper 54; in the initial state, the core barrel 3 is located in the valve seat 1, the valve clack 2 of the flap valve is in an open state, and the first magnetic element 8 can provide initial power for the valve clack 2, and the initial power can be detected by the corresponding pressure sensor 78.
2, initial experiments, enabling the valve seat 1 to be axially perpendicular to the horizontal plane, operating the core barrel driving mechanism 5, lifting the core barrel 3, and when the core barrel 3 is removed from the valve seat 1 and passes over the valve clack 2; the valve clack 2 makes variable acceleration movement under the repulsive force of the first magnetic part 8 to realize rotary closing, and at the moment, a normal vertical coring state is simulated.
3, readjusting to the initial state, rotating the first hand wheel 471, enabling the axis of the valve seat 1 to form a certain included angle with the horizontal plane, enabling the second base 42 to rotate by a certain angle by utilizing the control system, at the moment, operating the core barrel driving mechanism 5, lifting the core barrel 3, and when the core barrel 3 moves out of the valve seat 1, if the valve clack 2 can realize a rotating closing power process at different angles, at the moment, describing that the rotating closing experiment is successful.
After the valve clack 2 is closed, the third magnetic part 10 on the valve seat 1 can generate a pretightening force on the valve clack 2, so that the valve clack 2 generates a tight closing effect, at the moment, the human-computer interaction module 101 is used for filling gas into the valve seat 1, the pressure gauge is used for monitoring the air pressure, the real-time state of the air pressure can be displayed on the display screen of the control system, the air pressure is relieved after the air pressure reaches the maximum value, and the control system can automatically record and display the peak value of the air pressure and the process change rule.
The peak value of the air pressure in the valve seat 1 is the pretightening force of the third magnetic part 10 on the valve seat 1 to the valve clack 2, which is named as initial pretightening force, when the initial pretightening force is large, the valve clack can generate certain pressure maintaining capacity, and the pressure maintaining effect after closing is realized.
The spring for providing initial closing power for the valve clack is replaced by the magnet, the repulsive force generated by the repulsion of the magnets is far greater than the elastic force generated by the spring, namely, the magnetic potential energy generated between the magnets in the initial stage is large, and enough energy can be provided when the drilling machine drills horizontally or vertically upwards so that the valve clack can be closed by overcoming the friction force or gravity; in addition, the energy generated by the magnet is large enough to ensure that the rotation speed of the valve clack is large after the limit of the core barrel is lost, thereby ensuring the valve clack to be rapidly closed and preventing the valve clack from rollover.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The experimental method for the closure of the flap valve is characterized by comprising the following steps of: the method for testing the initial pretightening force of the flap valve comprises the following steps: a sealing plate with a through hole is arranged at one end, far away from the valve clack, of the flap valve, the valve clack is connected with the top end of the valve seat, the sealing plate is connected with the bottom end of the valve seat, the sealing plate is located below the valve clack, after the valve clack is closed, media are injected into the flap valve through the through hole, and meanwhile pressure change inside the flap valve is monitored.
2. The flap valve closure assay of claim 1 wherein: the valve clack is provided with a second magnetic element, and the valve seat is provided with a third magnetic element for attracting the valve clack.
3. The flap valve closure assay of claim 2, wherein: the first magnetic piece generates repulsive force to the second magnetic piece to trigger the valve clack to be closed, and the magnetic force between the first magnetic piece and the second magnetic piece is monitored.
4. The flap valve closure assay of claim 1 wherein: the valve clack is provided with a second magnetic part, repulsive force is generated on the second magnetic part through the first magnetic part outside to trigger the valve clack to be closed, and the magnetic force between the first magnetic part and the second magnetic part is monitored.
5. The method of claim 3 or 4, wherein: the magnetic force between the first magnetic piece and the valve clack is adjusted by linearly moving the first magnetic piece.
6. The flap valve closure assay of claim 1 wherein: the medium is a gas.
7. The method of claim 1, 2, 3, 4 or 6, wherein: the method comprises the following steps:
s1, initial state: the core barrel is positioned in the valve seat, and the flap valve is in an open state;
s2, lifting the core barrel, and closing the valve clack;
and S3, filling medium into the flap valve, monitoring the internal pressure through a pressure gauge, and releasing pressure after the pressure reaches the maximum value.
8. The flap valve closure assay of claim 7 wherein: in the step S1, in an initial state, an initial closing power is given to the valve clack through the first magnetic element, and the value of the initial closing power is measured through the pressure sensor.
9. The flap valve closure assay of claim 7 wherein: and S4, changing the inclination of the valve seat and/or rotating the valve seat by taking the valve seat axis as the center to change the position of the valve clack, and repeating S1-S3.
10. The flap valve closure assay of claim 9, wherein: the valve seat is arranged on a second base, the second base is rotatably arranged on a first base, the first base can rotate in a first direction, the second base can rotate relative to the first base in a second direction, 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 flap is changed by rotating the second base relative to the first base.
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