CN111880131A - Clamping assembly and method for magnetic force test of pressure maintaining controller capable of simulating high-temperature environment - Google Patents
Clamping assembly and method for magnetic force test of pressure maintaining controller capable of simulating high-temperature environment Download PDFInfo
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- CN111880131A CN111880131A CN202010621902.2A CN202010621902A CN111880131A CN 111880131 A CN111880131 A CN 111880131A CN 202010621902 A CN202010621902 A CN 202010621902A CN 111880131 A CN111880131 A CN 111880131A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to a clamping assembly and a method for magnetic force test of a pressure maintaining controller capable of simulating a high-temperature environment, and the clamping assembly comprises a clamping mechanism, a heat conducting cylinder and at least one electric heating ring, wherein the electric heating ring is operatively sleeved outside the heat conducting cylinder, the heat conducting cylinder is used for transferring heat from the electric heating ring to a magnetic seat, and the clamping mechanism is used for clamping the heat conducting cylinder and the magnetic seat together; the heat conducting cylinder consists of at least two tile-shaped sheets. The magnetic force testing device can heat the magnetic force seat while clamping the magnetic force seat, can be used for testing the magnitude of the magnetic force in a high-temperature environment and the relation between the magnetic force and the distance, can research the influence of high temperature on the magnetic force by comparing the relation between the magnetic force and the distance in the high-temperature environment and a normal-temperature environment, and has important significance on the research and performance improvement of the pressure maintaining controller.
Description
Technical Field
The invention relates to the technical field of magnetic measurement equipment, in particular to a clamping assembly and a method for magnetic test of a pressure maintaining controller, which can simulate a high-temperature environment.
Background
An important process of a rock coring drilling machine in deep coring is pressure-maintaining coring, a pressure-maintaining core is a precious sample in rock mechanics research, how to realize efficient pressure maintaining of the drilling machine is a development direction of the coring drilling machine, China makes many researches on the pressure-maintaining coring and the design of the drilling machine in recent years, and China makes ' one ' for one ' in the concept of ' five-protection ' coring proposed by xi peace academicians for the first time and then ' one ' for the pressure-maintaining coring. There are many techniques to be studied for the structural design of each part in the pressure-maintaining coring.
Patent document CN110847856A discloses a flap valve structure of pressure-maintaining coring device, in which the valve seat has magnetism to attract the valve flap to close. Because the valve clack is closed without depending on the gravity of the valve clack, the valve clack is not limited by the drilling direction. The magnetic force generated by the magnetomechanical machine is used for long-distance traction, and is an ideal unstructured traction device.
In the deep drilling process of the core drilling machine, along with a high-temperature and high-pressure environment, the deep ground high temperature has certain influence on the performance of the core drilling machine, the magnetism of a valve seat of a pressure maintaining controller is also influenced, and the influence of the high temperature on the magnetism of the valve seat (the magnetic force generated by the valve seat on the valve clack is reflected on the valve seat) needs to be specifically tested.
However, at present, a testing device for measuring the magnetic force of the valve seat in a high-temperature environment is lacked, so that the reliability of magnetic closing cannot be further verified, and the improvement of the pressure maintaining controller of the coring device is hindered.
Because the magnetic valve seat of the pressure-maintaining coring device is complex in numerical simulation and actual analog simulation experiments, the dynamic stress condition of the magnetic valve seat under different magnetic field combinations is difficult to study, and the mechanical model is fuzzy, so that a simplified model of a pressure-maintaining controller is usually used for replacing the magnetic valve seat in the experiments. As shown in fig. 1, a simplified model of the holding pressure controller includes a disk-shaped valve flap (No. 7) and a cylindrical magnetic seat (No. 6). The valve seat magnetic field combination and the mechanical model of the pressure maintaining controller of the coring device are improved deeply by researching the magnetic force magnitude of the simplified model magnetic force field.
As shown in fig. 2 and 3, when the magnetic base (serial number 6) of the simplified model has magnetic fields in multiple directions (arrows in the figure represent the magnetizing directions of the permanent magnets), the magnetic base (serial number 6) is formed by splicing multiple magnets (61), and how to measure the magnetic force applied to the valve flap by the whole magnetic base in the axial direction is unsolved by the prior art.
In addition, because the high temperature environment can appear in the pressurize controller operating mode, so the influence of high temperature environment to magnetic base magnetic field also needs the test, and this also prior art can't solve.
Disclosure of Invention
The invention provides a clamping assembly and a method for magnetic force test of a pressure maintaining controller, which can simulate a high-temperature environment.
The invention is realized by the following technical scheme:
the clamping assembly comprises a clamping mechanism, a heat conduction cylinder and at least one electric heating ring, wherein the electric heating ring is operatively sleeved outside the heat conduction cylinder, the heat conduction cylinder is used for transferring heat from the electric heating ring to a magnetic seat, and the clamping mechanism is used for clamping the heat conduction cylinder and the magnetic seat together;
further, the heat conducting cylinder is composed of at least two tile-shaped sheets.
Further, the clamp mechanism includes a pair of clamp arms.
Preferably, the clamping mechanism is a clamp.
Furthermore, a temperature sensor is arranged on the heat conducting cylinder.
Furthermore, the heat conducting cylinder is of a hollow structure, the temperature sensor is arranged in the hollow structure, and a heat conducting liquid medium is arranged in the hollow structure of the heat conducting cylinder.
Preferably, the material of the heat conduction cylinder is nonmetal or copper.
Further preferably, the material of the heat conducting cylinder is silicon nitride ceramic.
Furthermore, the clamping assembly for the magnetic force test of the pressure maintaining controller capable of simulating the high-temperature environment further comprises a cylindrical core, and the magnetic seat can be clamped between the cylindrical core and the clamping mechanism.
The method for testing the magnetic force of the pressure maintaining controller adopts the clamping component for testing the magnetic force of the pressure maintaining controller capable of simulating the high-temperature environment to clamp the magnetic seat.
Compared with the prior art, the invention has the following beneficial effects:
the magnetic force seat can be heated while being clamped, the magnetic force seat can be used for testing the magnitude of magnetic force in a high-temperature environment and the relation between the magnetic force and the distance, the influence of high temperature on the magnetic force generated when the tile-shaped permanent magnets in different magnetizing modes are combined into a cylinder can be researched by comparing the relation between the magnetic force and the distance in the high-temperature environment and the normal-temperature environment, and the magnetic force seat has important significance on the research and performance improvement of a pressure maintaining controller.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is a schematic structural view of a simplified model of a pressure holding controller;
FIG. 2 is a three-dimensional view of the magnetic sockets of the simplified model when they are brought together;
FIG. 3 is an exploded view of the magnetic base of the simplified model;
FIG. 4 is a three-dimensional view of a clamping assembly according to one embodiment;
FIG. 5 is an exploded view of a heat conducting cartridge;
FIG. 6 is a three-dimensional view of an electrical heating ring;
FIG. 7 is a three-dimensional view of the clamping mechanism;
FIG. 8 is a schematic view of the first embodiment under test;
FIG. 9 is a schematic view of a clamp assembly according to the second embodiment;
FIG. 10 is a schematic view of the third embodiment in the test;
FIG. 11 is a schematic view of the example four under test;
FIG. 12 is a schematic view showing the installation of the tensile testing apparatus according to the fifth embodiment;
FIG. 13 is a schematic view of the fifth example under test;
FIG. 14 is a schematic view of the sixth example under test.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example one
As shown in fig. 4 to 7, the clamping assembly for magnetic force test of pressure maintaining controller capable of simulating high temperature environment disclosed in this embodiment includes a clamping mechanism 3, a heat conduction cylinder 4 and at least one electric heating ring 5, the electric heating ring 5 is operatively sleeved on the heat conduction cylinder 4, the heat conduction cylinder 4 is used for transferring heat from the electric heating ring 5 to the magnetic base, and the clamping mechanism 3 is used for clamping the heat conduction cylinder 4 and the magnetic base together.
The length of the heat conducting cylinder 4 is consistent with the height of the magnetic base, and the inner diameter of the heat conducting cylinder 4 is matched with the outer diameter of the magnetic base so as to be in contact with the magnetic base surface, so that the heat conducting effect is improved. The number of the electric heating rings 5 is set according to the requirement, and can be two, three or more. The electric heating ring 5 avoids the clamping mechanism 3 and is sleeved outside the heat conducting cylinder 4.
As shown in fig. 5, the heat conducting tube 4 of the present embodiment is composed of at least two tile-shaped plates 41, so that the heat conducting tube 4 can be clamped on the magnetic base. The material of the heat conducting cylinder 4 is non-metal or copper so as to reduce the influence on the magnetic field of the magnetic seat, and the non-metal material is preferably silicon nitride ceramic.
In this embodiment, the clamping mechanism 3 is clamped on the heat conducting cylinder 4, and the magnetic base is clamped by clamping the heat conducting cylinder 4 consisting of tile-shaped sheets 41. Thus, the holding mechanism 3 has a space for accommodating the heat-conducting tube 4 when it is clamped.
As shown in fig. 7, the clamping mechanism 3 in this embodiment includes a pair of clamping arms, and the clamping surfaces of the clamping arms are cylindrical surfaces. Preferably, the clamping mechanism 3 is a clamp.
In the present embodiment, the temperature sensor is provided on the heat conductive tube 4. The heat conducting cylinder 4 can be arranged to be hollow, a temperature sensor is additionally arranged in the hollow heat conducting cylinder 4, and a heat conducting liquid medium can be refilled in the hollow part according to needs, wherein in the embodiment, the heat conducting liquid medium is selected from oil; then the electrical heating ring 5 at the outermost layer is electrified for heating, and then the oil temperature is increased until a preset temperature value is reached; when the temperature exceeds the set value, the power of the electric heating ring 5 can be automatically reduced, and the temperature of the heat conducting cylinder 4 is ensured to be constant. Thus, the temperature transmitted to the magnetic base through heat transfer is constant;
meanwhile, a temperature sensor can be additionally arranged on the magnetic base, and after the magnetic base is heated for a period of time, when the temperature on the magnetic base reaches the set temperature, the test can be started. The preset temperature may be specifically set according to the working environment of the pressure maintaining controller. Because the dwell controller is to operate in a deep environment, different temperature gradients can be set between 50 degrees celsius and 150 degrees celsius.
The magnetic force testing method for the pressure maintaining controller disclosed by the embodiment comprises the following steps:
first, as shown in fig. 8, the clamping mechanism 3 is mounted on the bracket, and the weighing device 1 is placed below the clamping mechanism 3;
the valve clack 7 is placed on the weighing device 1, the magnetic seat 6 is clamped by the clamping mechanism 3, the heat conduction cylinder 4 and the magnetic seat 6 are clamped together, and the electric heating ring 5 is sleeved outside the heat conduction cylinder 4;
starting the electric heating ring 5, moving the clamping mechanism 3 downwards when the temperature of the magnetic base 6 reaches a preset value, so that the magnetic base 6 is synchronously lowered, and recording the height of the clamping mechanism 3 and the measured value of the weighing device 1 at the corresponding moment according to the requirement in the lowering process;
when the measured value of the weighing device 1 becomes 0, it is stated that the magnetic base 6 has just attracted the flap 7, and then the locking knob 21 is tightened, and the height of the clamping mechanism 3 at this time is read out by means of the height scale markings 22 on the bracket and recorded.
In this embodiment, the bracket includes a base 21 and a pillar 22, and the bottom of the pillar 22 is fixedly connected to the base 21. The fixture 3 is fixed to the column 22. The upright post 22 can be an automatic lifting mechanism or a manual lifting mechanism, and the lifting of the clamping mechanism 3 is realized by adjusting the height of the upright post 22.
If the upright column 22 is an automatic lifting mechanism, the upright column 22 may be a conventional driving mechanism such as a linear motor, an air cylinder, a hydraulic cylinder, etc. If the upright 22 is a manual automatic lifting mechanism, the upright 22 can select a damping telescopic rod.
The weighing device 1 is an electronic scale. The electronic scale works through a piezoresistor and an electronic chip, and is irrelevant to a magnetic field, so that the electronic scale can be optimized.
The magnetic force testing device can heat the magnetic force seat while clamping the magnetic force seat, can be used for testing the magnitude of the magnetic force in a high-temperature environment and the relation between the magnetic force and the distance, can research the influence of high temperature on the magnetic force by comparing the relation between the magnetic force and the distance in the high-temperature environment and a normal-temperature environment, and has important significance on the research and performance improvement of the pressure maintaining controller.
Example two
The difference between this embodiment and the first embodiment is: as shown in fig. 9, the clamping assembly for magnetic force test of the pressure maintaining controller capable of simulating high temperature environment in the embodiment further includes a cylindrical core 8. The outer diameter of the cylindrical core 8 is equal to the inner diameter of the magnetic base 6. When the heat conducting cylinder is used, the cylindrical core 8 is arranged in the center of the magnetic base 6, the clamping mechanism 3 provides a restraining force for the magnetic base 6 from the outside, and the magnetic base 6 and the heat conducting cylinder 4 are fixed together through the clamping action of the cylindrical core 8 and the inside and the outside of the clamping mechanism 3. The cylindrical core 8 does not affect the magnetic force of the magnetic base 6. The cylindrical core 8 may be a wood core, a rock core, a plastic tube, or the like. The cylindrical core 8 is a core and can simulate whether the core influences the magnetic force; the cylindrical core 8 is a plastic tube which can simulate the process of real coring.
EXAMPLE III
As shown in fig. 10, the present embodiment measures the displacement or height of the gripping mechanism 3 by the displacement sensor 9 or distance sensor mounted on the bracket when testing the magnetic force.
During testing, the displacement sensor 9 or the distance sensor and the weighing device 1 are electrically connected with the control system. The control system can automatically record the measured value of the lower displacement sensor 9 or distance sensor and the measured value of the weighing device 1 at the corresponding moment in the course of the downward movement and when the measured value of the weighing device 1 is 0.
Example four
As shown in fig. 11, the linear driving mechanism 10 is used to drive the holding mechanism 3 to move vertically when testing the magnetic force. The linear driving mechanism 10 is installed on the base 21, the clamping mechanism 3 is connected with the upright column 22 in a sliding mode, and the output end of the linear driving mechanism 10 is connected with the clamping mechanism 3. The linear driving mechanism 10 may be a linear motor, an air cylinder, a hydraulic cylinder, or other conventional driving mechanisms.
EXAMPLE five
In the first embodiment, the weighing device is used to measure the relationship between the magnetic force applied to the valve flap 7 and the distance between the magnetic seat 6 and the magnetic seat 6 when the magnetic force is not greater than the gravity at the earlier stage and the magnetic seat 6 is far away from the valve flap 7. However, when the magnetic base 6 moves down to the position where the magnetic force applied to the valve flap 7 is greater than the self-gravity, the weighing device 1 will lose its function.
Therefore, in this embodiment, the tensile force measuring device 101 is used to measure the upward acting force of the valve flap, and then the magnetic force greater than the gravity can be measured. The specific method comprises the following steps:
as shown in fig. 12 and 13, the tension measuring device 101 is disposed below the platform 102, and the tension measuring device 101 may be mounted on the platform 102 or on the base 21; the flap 7 rests on the platform 102. The tension measuring device 101 may be a fixed electronic tension meter, which is fixed on the platform 102 or the base 21 by bolts.
The force measuring hook end of the tension measuring device 101 is sleeved with the connecting part 104, and the other end of the connecting part 104 is tied to the valve clack 7 after penetrating through the through hole 103 on the object placing platform 102, so that the center lines of the tension measuring device 101, the connecting part 104 and the valve clack 7 are on the same straight line.
Then debugging is carried out, so that the connecting part 104 is straight, and the measured value of the tension measuring device 101 is zero;
the clamping mechanism 3 clamps the magnetic base 6, the electric heating ring 5 is started, and when the temperature of the magnetic base 6 reaches a preset value, the clamping mechanism 3 is moved downwards to enable the magnetic base 6 to be synchronously lowered;
when the measured value of the tension measuring device 101 is changed from 0 to non-0, the magnetic seat 6 just attracts the valve flap 7, and the height or displacement of the magnetic seat 6 at the moment is recorded;
and continuing to lower the magnetic base 6, and recording the corresponding height or displacement of the magnetic base 6 and the measured value of the tension measuring device 101 at the corresponding moment according to the requirement in the process. When the valve flap 7 is moved upwards against the force of gravity and the force of the tension measuring device 101, the magnetic force is equal to the sum of the force of gravity of the valve flap 7 and the force measured by the tension measuring device 101. Because in this process, the magnetic force that valve clack 7 receives is greater than self gravity, therefore valve clack 7 can be unsettled and gradually upwards move, for the distance between valve clack 7 and magnetic force seat 6 this moment of measurement, the height of valve clack 7 or calculate the ascending displacement of valve clack 7 this moment need be recorded, can calculate the distance of magnetic force seat 6 and valve clack 7 through the height of fixture 3 and valve clack 7.
The tension measuring device 101 may be selected from an electronic tension meter, a spring balance, and the like. The connecting member 104 may be selected from a string, a band, a cord, and the like. The connecting member 104 is preferably a rigid cable, which is guaranteed not to deform, so as not to affect the experimental results.
In the embodiment, the relationship between the magnetic force borne by the valve clack and the distance can be measured by adopting the tension measuring device 101, and the valve clack measuring device has a simple structure and is convenient to operate; the magnetic force testing device can be used for testing and comparing the magnetic force of the pressure maintaining controller in different magnetic field combination modes, and has important significance for research and performance improvement of the pressure maintaining controller.
EXAMPLE six
The present embodiment employs the weighing device 1 and the tension measuring device 101 to collectively test the magnetic force. As shown in fig. 7, 12 and 13, the invention adopts the weighing device 1 to measure the relationship between the magnetic force and the distance when the magnetic force is smaller than the gravity; after the tension measuring device 101 is used for measuring the relation between the magnetic force and the distance after the magnetic force is larger than the gravity. The method comprises the following steps:
firstly, measuring the relation between the magnetic force and the distance by using the weighing device 1 when the magnetic force is smaller than the gravity of the valve clack 7;
when the weighing device 1 shows 0, the scale or displacement is recorded;
subsequently, the measurement is continued by replacing the tension measuring device 101.
Wherein, the weighing device 1 can be directly arranged on the base 4, and also can be directly arranged on the object platform 102 with the through hole 103. If the weighing device 1 is placed on the base 4, the platform 102 is not mounted on the stand before the start of measurement, and when the weighing device is replaced by the tension measuring device 101, the platform 102 is mounted on the stand, and the distance between the clamping mechanism 3 and the platform 102 needs to be adjusted. It is known that when the weighing apparatus 1 is shown as 0, the distance between the weighing apparatus 1 and the clamping mechanism 3 is h, and the distance between the clamping mechanism 3 and the platform 102 needs to be adjusted at this time.
If the weighing device 1 is placed on the platform 102 in the through hole 103. Because the valve clack 7 is directly arranged on the weighing device when the weighing device 1 is used for measuring, and when the tension measuring device 101 is adopted, the valve clack 7 is directly arranged on the object placing platform 102, when the tension measuring device 101 is used for measuring, the object placing platform 102 needs to move upwards by the height of the weighing device, so that the distance between the valve clack 7 and the magnetic seat 6 before and after replacement is unchanged.
The method of this embodiment can measure the magnetic force versus distance of the magnetic seat and the valve flap throughout the process of approaching.
EXAMPLE seven
The present embodiment employs the weighing device 1 and the pressure measuring device to collectively test the magnetic force. The invention adopts the weighing device 1 to measure the relationship between the magnetic force and the distance when the magnetic force is smaller than the gravity; and after the pressure measuring device is used for measuring the relation between the magnetic force and the distance after the magnetic force is greater than the gravity.
As shown in fig. 14, the pressure measuring device includes a vertical rod 105 and a pressure measuring probe 106 mounted on a lower end of the vertical rod 105. The outer diameter of the vertical rod 105 should be smaller than the inner diameter of the magnetic holder 6. The vertical rod 105 is preferably a non-metallic material.
The vertical rod 105 is detachably mounted on the column 2 in this embodiment. The upper end of the vertical rod 105 is connected with a sleeve or a clamping arm, the sleeve is installed on the upright post 2 and is in clearance fit with the upright post 2, a locking knob 24 is arranged between the sleeve and the upright post 2, and the position of the sleeve can be locked and fixed through the locking knob 24. The clamping arm may be selected as a clamp.
The test method of this example is as follows:
placing the valve flap 7 on the weighing device 1; the clamping mechanism 3 clamps the magnetic base 6;
the lower end of the vertical rod 105 penetrates through the middle of the magnetic base 6, the lower end of the pressure measuring probe 106 is in contact with the top surface of the valve clack 7, and the measured value of the pressure measuring probe 106 is 0;
then, the electric heating ring 5 is started, when the temperature of the magnetic base 6 reaches a preset value, the clamping mechanism 3 is moved downwards, the magnetic base 6 is synchronously lowered, and the height of the clamping mechanism 3 and the measured value of the weighing device 1 at the corresponding moment are recorded according to the requirement in the lowering process;
when the measured value of the weighing device 1 becomes 0, the magnetic seat 6 is indicated to just attract the valve clack 7, the height of the clamping mechanism 3 at the moment is read through the height scale mark 22 and recorded;
and continuously moving the clamping mechanism 3 downwards to synchronously lower the magnetic base 6. In the process, the magnetic force borne by the valve flap 7 is greater than the self gravity, so the valve flap 7 has a tendency of moving upwards, but due to the blocking of the pressure measuring probe 106, the valve flap 7 can be still, but an upward thrust can be given to the pressure measuring probe 106, and the thrust can be directly measured through the pressure measuring probe 106. The measurement values of the pressure measuring probe 106 and the height or displacement of the holding means 3 can be recorded as desired during this process.
The method can test and compare the magnetic force of the pressure maintaining controller in different magnetic field combination modes, can measure the relationship between the magnetic force and the distance of the magnetic seat and the valve clack in the whole process of gradually approaching, and has important significance for the research and performance improvement of the pressure maintaining controller.
Of course, the invention can also be used to test the relationship of magnetic force to distance of different magnets and their attracting substances in the whole process of approaching gradually. It is particularly suitable for testing cylindrical or cylindrical magnets.
The above embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. Clamping component for magnetic force test of pressure maintaining controller capable of simulating high temperature environment, which is characterized in that: the clamping mechanism is used for clamping the heat conduction barrel and the magnetic seat together.
2. The clamping assembly for magnetic force testing of a pressure holding controller capable of simulating a high-temperature environment according to claim 1, wherein: the heat conducting cylinder is composed of at least two tile-shaped sheets.
3. The clamping assembly for magnetic force testing of pressure holding controller capable of simulating high temperature environment according to claim 1 or 2, wherein: the gripper mechanism includes a pair of gripper arms.
4. The clamping assembly for magnetic force testing of a pressure holding controller capable of simulating a high temperature environment according to claim 3, wherein: the clamping mechanism is a hoop.
5. The clamping assembly for magnetic force testing of pressure holding controller capable of simulating high temperature environment according to claim 2 or 3, wherein: and a temperature sensor is arranged on the heat conducting cylinder.
6. The clamping assembly for magnetic force testing of a pressure holding controller capable of simulating a high temperature environment according to claim 5, wherein: the heat conducting cylinder is of a hollow structure, the temperature sensor is arranged in the hollow part, and a heat conducting liquid medium is arranged in the hollow part of the heat conducting cylinder.
7. The clamping assembly for magnetic force testing of pressure holding controller capable of simulating high temperature environment according to claim 1, 2, 3 or 4, wherein: it also comprises a cylindrical core, and the magnetic base can be clamped between the cylindrical core and the clamping mechanism.
8. The clamping assembly for magnetic force testing of pressure holding controller capable of simulating high temperature environment according to claim 1, 2, 6 or 7, wherein: the heat conducting cylinder is made of nonmetal or copper.
9. The clamping assembly for magnetic force testing of pressure holding controller capable of simulating high temperature environment according to claim 1, 2, 6 or 7, wherein: it also comprises a cylindrical core, and the magnetic base can be clamped between the cylindrical core and the clamping mechanism.
10. The magnetic force testing method of the pressure maintaining controller is characterized by comprising the following steps: the method adopts the holding assembly for the magnetic test of the pressure maintaining controller capable of simulating the high-temperature environment, which is disclosed by any one of claims 1 to 9, to hold the magnetic seat.
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| CN111880131B (en) | 2022-03-29 |
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