CN114674175B - Electromagnetic emission simulation experiment platform capable of adjusting initial contact pressure and measurement method thereof - Google Patents
Electromagnetic emission simulation experiment platform capable of adjusting initial contact pressure and measurement method thereof Download PDFInfo
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- CN114674175B CN114674175B CN202210308700.1A CN202210308700A CN114674175B CN 114674175 B CN114674175 B CN 114674175B CN 202210308700 A CN202210308700 A CN 202210308700A CN 114674175 B CN114674175 B CN 114674175B
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- 239000004637 bakelite Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 20
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- 238000007599 discharging Methods 0.000 claims abstract description 3
- 230000001105 regulatory effect Effects 0.000 claims abstract 7
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- 239000011521 glass Substances 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
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- 230000007547 defect Effects 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000003721 gunpowder Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
- F41B6/00—Electromagnetic launchers ; Plasma-actuated launchers
- F41B6/006—Rail launchers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/008—Subject matter not provided for in other groups of this subclass by doing functionality tests
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- Testing Electric Properties And Detecting Electric Faults (AREA)
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Abstract
The invention discloses an electromagnetic emission simulation experiment platform capable of adjusting initial contact pressure and a measurement method thereof, wherein the electromagnetic emission simulation experiment platform comprises a charging loop, a capacitor bank, an electromagnetic emission device, a control system, an initial contact pressure adjusting device and a contact pressure measuring module; the charging loop consists of an alternating current power supply, a transformer and a rectifier; the capacitor group is formed by connecting a plurality of capacitors in series and parallel; the electromagnetic emission device consists of two cuboid guide rails, an armature, an bakelite bottom plate and a fixed plate; the control system consists of a switch and a time sequence control switch, and controls the charging process of the charging loop to the capacitor bank and the time sequence discharging process of the capacitor bank to the cuboid-shaped guide rail; the contact pressure adjusting device consists of a pressure adjusting device and a flexible pressure sensor; the pressure regulating device is arranged in the middle of the tail part of the armature. The invention can effectively adjust the contact pressure between the armature and the guide rail, the contact pressure adjusting device has light weight, and the optimal initial pressure during electromagnetic emission can be measured.
Description
Technical Field
The invention relates to the technical field of electromagnetic emission, and provides an electromagnetic emission simulation experiment platform capable of adjusting initial contact pressure and a measurement method thereof.
Background
With the continuous innovation of technology, military weapons are being updated faster and faster. The traditional chemical emission technology represented by gunpowder is difficult to meet the pursuit of the modern military technology for higher speed and higher efficiency, the electromagnetic emission technology replaces gunpowder emission objects with electromagnetic force, and targets are killed and destroyed by ultra-high kinetic energy, so that the technology is a new concept weapon technology which is developed in competitive phase in all military countries in the world today. Electromagnetic launch (Electromagnetic Launch, EML) technology is a novel launch technology that accelerates objects to ultra-high speeds, which uses electromagnetic forces to drive a payload, which converts electromagnetic energy into mechanical kinetic energy that accelerates a variety of objects including projectiles, shells, missiles, rockets, satellites, aircraft, and the like. Electromagnetic emission devices have been the subject of electromagnetic energy to mechanical energy conversion and have been the focus of research in practice to address a number of problems. When the electromagnetic track gun is launched, electric energy of MJ level is input, the outlet speed reaches several kilometers per second, the working condition is extremely bad, the material is subjected to extremely large instantaneous current impact, and serious ablation of the track is easy to cause. Studies have shown that ablation is more severe at the surface of the track electrode where the pellets pass. The shape of the track electrode surface after ablation is mainly arc marks, arc pits and drop-shaped particles hung on the upper track electrode. Not only does ablation severely impact the life of the tube, but the presence of adhered metal fragments in front of the projectile can cause failure of firing.
Many students have conducted intensive research into and have made breakthroughs in the problem of sliding arc ablation of the track. In terms of influencing mechanism, the service life of the steel rail is closely related to the interaction and coupling of fields in a complex coupling system due to the fact that magnetic, temperature and stress multi-physical field coupling exists in the high-speed electric sliding contact process between the armature and the steel rail in the EML process. Through experimental research, the existing transition mechanism of sliding arc ablation mainly comprises a melting wave mechanism, a surface high-speed friction and wear mechanism, a separation electromagnetic force mechanism and the like. Parks proposed a "melt wave" mechanism based on the velocity skin effect for the first time in 1990, but the transition model proposed by Parks has been in need of improvement. Many scholars have proposed non-ideal contact models, "magnetic sawing effect" models, etc. for improving this model. The high-speed wear of the surface is one of the influencing factors for transition to the sliding arc, and under the condition of extreme sliding of high current and high speed, the friction heat of the interface is increased sharply. When the temperature exceeds the bearing limit of the contact interface of the armature rail, the contact interface of the armature is melted, so that the original solid-liquid solid contact state is changed into a solid-liquid solid contact state. Because of the influence of the dynamic characteristics of the metal liquefaction layer of the pivot-rail contact interface, the pivot-rail interface may lose contact due to the instability of the liquefaction layer, so that transition occurs. The influence of electromagnetic forces occurs mainly in the second half of the emission process, i.e. when the current drops. At this time, the eddy current can generate electromagnetic force inwards relative to the guide rail to cause the armature and the guide rail to generate a gap, so that transition is formed.
Aiming at the defects of arc ablation on a metal material damage mechanism and a protection technology in the current electromagnetic emission device, a plurality of students build an electromagnetic emission simulation experiment platform to research the arc ablation on the metal material damage mechanism and the protection technology, but when the electromagnetic emission simulation experiment platform applies initial contact pressure to a guide rail, a method for leaving surplus parts at the tail part of an armature is adopted, and the method has the great defects that the initial contact pressure cannot be well controlled, and the optimal initial contact pressure is troublesome to find.
Disclosure of Invention
The invention aims to provide a device and an experimental method capable of adjusting initial contact pressure between an armature and a guide rail aiming at the current electromagnetic emission simulation experiment platform, so as to find the optimal initial contact pressure between the armature and the guide rail during electromagnetic emission and measure the contact pressure change condition during the moving process of the armature.
The technical scheme of the invention is as follows: the electromagnetic emission simulation experiment platform comprises a charging loop, a capacitor bank, an electromagnetic emission device, a control system and a contact pressure adjusting device.
The charging loop consists of an alternating current power supply, a transformer and a rectifier; the alternating current power supply is 220V alternating current, the alternating current power supply is connected with a transformer, and after the transformer is boosted, the alternating current is converted into direct current through a rectifier, and then the direct current is charged into a capacitor bank through a switch.
The capacitor bank is formed by connecting a plurality of capacitors in parallel, wherein the capacity of each capacitor is 0.8mF, and the total capacity of each capacitor is 3.2mF, and the capacitor bank can be charged to 10kV; one end is connected with the charging loop, and the other end is connected with the electromagnetic transmitting device.
The electromagnetic emission device consists of a cuboid guide rail (the main material is copper), an armature (the material is aluminum alloy), an bakelite bottom plate and a fixed plate; the bakelite bottom plate has a certain thickness, ensures the insulation distance with the ground, is generally more than 2cm, and is provided with a groove on the upper surface; the length of the groove is consistent with the length of the cuboid-shaped guide rail, and the width of the groove is equal to the sum of the width of the cuboid-shaped guide rail and the width of the pressure measuring probe; the fixing plate is made of bakelite, is fixed on the bakelite bottom plate, is adjacent to the groove in position, is provided with holes on the bakelite bottom plate and is used for connecting wires of the flexible pressure sensor, and the number of the wires is consistent with that of the pressure measuring probes;
The fixing plate is made of insulating materials, such as glass or bakelite, and the upper part of the fixing plate is provided with an L-shaped clamping hook protruding forwards to prevent the cuboid-shaped guide rail from tilting in the moving process of the armature; the bottoms of the two cuboid-shaped guide rails are placed in the grooves in parallel, and the upper parts of the two cuboid-shaped guide rails are exactly tangent to the grooves of the fixed plate; the armature clamp is in the middle of two cuboid guide rails, and the afterbody has surplus part, guarantees that when the armature removes, takes contact pressure adjusting device to remove, prevents to drop in the motion process.
The control system consists of a switch a, a switch b, a time sequence control switch and a control console; the switch a controls the charging loop to charge the capacitor bank, and the switch b and the time sequence control switch are used for discharging the capacitor bank to the electromagnetic transmitting device; the time sequence control switch can discharge the capacitor bank according to a certain sequence, and the discharge time interval is controllable; the control console consists of an alternating current/direct current control console and a time sequence switch control console, and controls the charging loop, the switch a, the switch b and the time sequence control switch respectively.
The contact pressure adjusting device is preferably made of materials with light weight, high hardness and good insulating property, such as glass or bakelite, and consists of a right adjusting plate, a left adjusting plate and an adjusting rod, wherein the contact pressure adjusting device is arranged in the middle of the tail part of the armature; the adjusting rod is in the shape of a frustum, and is provided with threads, and the slope of each tangent line of each point of the threads is required to be the same. The right adjusting plate and the left adjusting plate are provided with a hole, and the shape of the hole is a quadrangular pyramid when the right adjusting plate and the left adjusting plate are combined together; the bus slopes of the frustum and the quadrangular pyramid are required to be the same;
The contact pressure measuring module measures the contact pressure between the armature and the cuboid-shaped guide rail, is arranged between the cuboid-shaped guide rail and the fixed plate, and consists of a pressure measuring probe and a detecting module; the pressure measurement probe consists of an insulating block and a flexible pressure sensor;
the insulating block is preferably made of a material with light weight, high hardness and good insulating property, such as glass or bakelite, and has the functions of protecting the pressure sensor patch in a high-pressure environment and ensuring that the flexible pressure sensor is uniformly stressed;
the invention also provides a measuring method, which comprises the following steps:
1) Confirming that the transformer and the capacitor bank are reliably grounded; checking a charging loop, a capacitor bank, an electromagnetic emission device, a control system, an initial contact pressure adjusting device and a contact pressure measuring module;
2) The armature is arranged between the two cuboid guide rails;
3) Placing a contact pressure adjusting device in the middle of the tail part of the armature, rotating an adjusting rod to give a certain initial pressure to the contact surface of the armature and the guide rail, and recording the value of the contact pressure as a reference contact pressure;
4) Closing a charging loop switch, pressurizing the capacitor bank by using a control console, and charging the capacitor bank to the required voltage;
5) The control power supply is reduced in voltage and turned off, and the time sequence switch is closed, so that the capacitor bank discharges to the cuboid-shaped guide rail;
6) Recording pressure change measured by a contact pressure measuring module in the moving process of the armature and the speed of the armature when flying out of the cuboid-shaped guide rail;
7) Rotating the adjusting rod by a certain angle, carrying out an experiment again under the voltage of the step 4, carrying out the steps 4,5 and 6, and comparing the measured speed with the last measured speed;
8) Repeating the experiment until a maximum speed is obtained, at which time the contact pressure is optimal;
The invention has the beneficial effects that: the electromagnetic emission simulation experiment platform is used for researching the damage mechanism and the protection technology of arc ablation on metal materials, but when initial contact pressure is applied to an armature and a guide rail, a method for reserving surplus parts at the tail part of the armature is adopted, and the method has the great defects that the initial contact pressure cannot be controlled well and the optimal initial contact pressure is difficult to find. The present invention overcomes the above-mentioned difficulties by providing an apparatus and experimental method for adjusting contact pressure between armature and rail, finding the optimal initial contact pressure between armature and rail during electromagnetic emissions, and measuring the change in contact pressure during movement of the armature.
Drawings
Fig. 1 is a schematic diagram of structural connection relation of an electromagnetic emission simulation experiment platform capable of adjusting initial contact pressure.
Fig. 2 is a schematic diagram of power line connection of an electromagnetic emission simulation experiment platform with adjustable initial contact pressure.
FIG. 3 is a schematic diagram showing the structure of an electromagnetic emission device in an electromagnetic emission simulation experiment platform with adjustable initial contact pressure, wherein (a) is a schematic diagram showing the positions, connection relations and structure of a rectangular guide rail, an bakelite bottom plate and a fixed plate (304); (b) is a schematic structural view of an armature; (c) Is a schematic diagram of the position relationship of the components on the bakelite plate, the grooves on the bakelite plate and the open holes on the fixing plate.
Fig. 4 is a schematic structural diagram of a contact pressure adjusting device in an electromagnetic emission simulation experiment platform capable of adjusting initial contact pressure.
FIG. 5 is a schematic view of the initial contact pressure adjusting device, wherein (a) is a left adjusting plate; (b) a right adjustment plate three view; (c) is a schematic structural view of the adjusting rod.
Detailed Description
The invention will be further described with reference to the drawings and examples.
An electromagnetic emission simulation experiment platform capable of adjusting initial contact pressure and a measurement method thereof are provided, the structure diagram of the electromagnetic emission simulation experiment platform is shown in figure 1, and the electromagnetic emission simulation experiment platform comprises a charging loop 1, a capacitor bank 2, an electromagnetic emission device 3, a control system 4, a contact pressure adjusting device 5 and a contact pressure measurement module 6;
fig. 2 is a diagram showing the connection of the power lines of the present invention, in which it can be seen that the charging circuit 1 is composed of an ac power source 101, a transformer 102 and a rectifier 103; the alternating current power supply 101 is 220V alternating current, the alternating current power supply 110 is connected with the transformer 102, is controlled by the control system 4, is boosted by the transformer 102, is converted into direct current by the rectifier 103, and is charged by the switch to the capacitor bank 2; the capacitor bank 2 is formed by connecting a plurality of capacitors 201 in parallel, the capacity of each capacitor 201 is 0.8mF, and the total capacity is 3.2mF, so that the voltage can be increased to 10kV; one end is connected with the charging loop 1, and the other end is connected with the electromagnetic emission device 3;
The electromagnetic emission device 3 is composed of a rectangular parallelepiped guide rail 301 (main material copper), an armature 302 (material of which is aluminum alloy), an bakelite base plate 303 and a fixing plate 304, as shown in fig. 3; the bakelite bottom plate 303 has a certain thickness to ensure the insulation distance with the ground, and has a groove 306 on the upper surface; the length of the groove 306 is consistent with the length of the cuboid-shaped guide rail 301, and the width is equal to the sum of the width of the cuboid-shaped guide rail 301 and the width of the pressure measuring probe 601; the fixing plate 304 is made of bakelite, is fixed on the bakelite bottom plate 303, is adjacent to the groove 306, is provided with holes 305 for connecting wires of the flexible pressure sensor 6012, and has the same number as the pressure measuring probes 601; the upper part of the fixed plate is provided with an L-shaped clamping hook 3041 protruding forwards, and the L-shaped clamping hook is used for preventing the cuboid-shaped guide rail 301 from tilting in the moving process of the armature 302; the two cuboid-shaped guide rails 301 are placed in the grooves 306 in parallel, and the upper parts of the two cuboid-shaped guide rails are exactly tangent to the inner sides of the L-shaped clamping hooks 3041 of the fixing plates; the armature 302 is clamped between the two cuboid guide rails 301, and the tail part is provided with a surplus part 3021, so that when the armature 302 moves, the belt contact pressure adjusting device 5 moves;
The control system 4 consists of a switch a401, a switch b402, a time sequence control switch 403 and a control console 404; switch a401 controls charging loop 1 to charge capacitor bank 2, switch b402 and timing control switch 403 are used for capacitor bank 2 to discharge electromagnetic transmitting device 3; the time sequence control switch 403 can discharge the capacitor bank 2 according to a certain sequence, and the discharge time interval is controllable; the control console 404 consists of an alternating current/direct current control console and a time sequence switch control console, the control system controls the transformer 102 and the rectifier 103 of the charging loop 1, and the time sequence switch control console controls the switch a401, the switch b402 and the time sequence control switch 403;
Fig. 4 is a view of the contact pressure adjusting device. The contact pressure adjusting device 5 is arranged at the tail part of the armature 302; consists of a right adjusting plate 501, a left adjusting plate 502 and an adjusting rod 503; the adjusting rod 503 is in the shape of a frustum, and is provided with threads, and the slope of each tangent line of the threads is required to be the same; the right adjusting plate 501 and the left adjusting plate 502 are provided with a groove, a hole with a quadrangular pyramid shape is required to be formed when the right adjusting plate 501 and the left adjusting plate 502 are combined together, the hole wall is carved with a notch with the same slope as the thread tangent of the adjusting rod 503, the contour is the same as the thread contour, and the bus slope of the frustum and the quadrangular pyramid is required to be the same; the diameter of the bottom surface with small area of the adjusting rod 503 is required to be between the lengths of the two bottom surfaces of the quadrangular pyramid, and the right adjusting plate 501, the left adjusting plate 502 and the adjusting rod 503 are made of light weight, high hardness and good insulating property; the surface of the adjusting rod 503 with a large diameter is provided with a hole, so that the adjusting rod 503 is conveniently screwed between the right adjusting plate 501 and the left adjusting plate 502 by a tool to perform pressure adjusting work;
the contact pressure measuring module 6 measures the contact pressure between the armature 302 and the cuboid-shaped guide rail 301, is arranged between the cuboid-shaped guide rail 301 and the fixed plate 304, and consists of a pressure measuring probe 601 and a detecting module 602; fig. 5 is a structural diagram of a pressure measurement probe. The pressure measurement probe 601 is composed of an insulating block 6011 and a flexible pressure sensor 6012.
The measuring method comprises the following implementation steps:
1) Confirm that the charging loop 1 and capacitor bank 2 are reliably grounded; checking the charging circuit 1, the capacitor bank 2, the electromagnetic transmitting device 3, the control system 4, the initial contact pressure adjusting device 5 and the contact pressure measuring module 6;
2) Placing an armature 302 in the electromagnetic emission device 3 in the middle of the rectangular parallelepiped guide rail 301;
3) Placing the contact pressure adjusting device 5 in the middle of the armature 302 to enable the contact pressure adjusting device to give a certain initial pressure to the contact surface of the armature and the cuboid-shaped guide rail 301, and recording the value of the contact pressure as a reference contact pressure;
4) Closing the switch of the charging loop 1, pressurizing the capacitor bank 2 by using the control console 404 to charge the capacitor bank to the required voltage;
5) The charging loop 1 is closed by depressurization, and the time sequence switch is closed to discharge the capacitor bank 2 to the cuboid-shaped guide rail 301;
6) Recording the pressure change on the detection module 602 and the speed of the armature 302 when flying out of the cuboid-shaped guide rail 301 during the movement of the armature 302;
7) Rotating the adjusting rod 503 by a certain angle, carrying out an experiment again under the voltage of the step 4, carrying out the steps 4,5 and 6, and comparing the measured speed with the speed measured last time;
8) Repeating the experiment until the maximum moving speed is obtained, wherein the maximum moving speed is the optimal contact pressure; thus, the contact pressure change during the movement of the armature and the contact pressure at the maximum movement speed can be measured.
Claims (2)
1. The electromagnetic emission simulation experiment platform capable of adjusting initial contact pressure is characterized by comprising a charging loop (1), a capacitor bank (2), an electromagnetic emission device (3), a control system (4), an initial contact pressure adjusting device (5) and a contact pressure measuring module (6);
The charging loop (1) is connected with the capacitor bank (2) and is used for charging the capacitor bank (2);
the charging loop (1) comprises an alternating current power supply (101), a transformer (102) and a rectifier (103); the alternating current power supply (101) is 220V alternating current, the alternating current power supply (101) is connected with the transformer (102), after the voltage is boosted by the transformer (102), the alternating current is changed into direct current through the rectifier (103), and then the direct current is charged into the capacitor bank (2) through the switch;
the capacitor bank (2) is formed by connecting a plurality of capacitors (201) in parallel, and the capacity of each capacitor (201) is 0.8mF;
The electromagnetic emission device (3) is connected with the capacitor bank (2), and the capacitor bank (2) is used for discharging the electromagnetic emission device (3);
The electromagnetic emission device (3) comprises a cuboid guide rail (301), an armature (302), a bakelite base plate (303) and a fixing plate (304);
The cuboid-shaped guide rail (301) is made of copper conductor materials;
The armature (302) is made of an aluminum alloy material;
the thickness of the bakelite bottom plate (303) is more than 2cm;
the fixing plate (304) is made of insulating materials;
the electromagnetic emission device (3) comprises:
the cuboid-shaped guide rail (301) comprises two guide rails with the same size;
The armature (302) is arranged between the two cuboid-shaped guide rails (301), the initial contact pressure adjusting device (5) is arranged in the armature (302), and the contact pressure of the contact surfaces of the cuboid-shaped guide rails (301) and the armature (302) is controlled and adjusted through the tension;
The armature (302) is U-shaped, the moving end of the armature is a U-shaped bottom, the opening part opposite to the U-shaped bottom is provided with an inward backstop (3021), and the backstop (3021) is used for clamping the initial contact pressure adjusting device (5) and driving the initial contact pressure adjusting device (5) to synchronously move when the armature (302) moves;
the bakelite base plate (303) is used for supporting and insulating;
the upper surface of the bakelite bottom plate (303) is provided with grooves (306), and the number of the grooves (306) is two and the grooves are respectively used for accommodating two cuboid-shaped guide rails (301);
The fixing plate (304) comprises two fixing plates, the two fixing plates are respectively arranged on the outer sides of the cuboid-shaped guide rails (301), the bottom end of the fixing plate (304) is fixedly connected with the bakelite base plate (303), an L-shaped clamping hook (3041) facing the cuboid-shaped guide rails (301) is arranged on the surface of the top end of the fixing plate, and the L-shaped clamping hook (3041) is used for embedding the cuboid-shaped guide rails (301) between the upper surfaces of the fixing plates (304) and the bakelite base plate (303) so as to prevent the two cuboid-shaped guide rails (301) from inclining in the moving process of the armature (302);
The control system (4) is connected to a circuit between the charging loop (1) and the capacitor bank (2) and also connected to a circuit between the capacitor bank (2) and the electromagnetic emission device (3), and is used for controlling the charging loop (1) to charge the capacitor bank (2) and controlling the capacitor bank (2) to discharge the electromagnetic emission device (3);
the control system (4) comprises a switch a (401), a switch b (402), a time sequence control switch (403) and a console (404);
The switch a (401) is connected with the charging loop (1), the control console (404) and the capacitor bank (2), and controls the charging loop (1) to charge the capacitor bank (2);
The switch b (402) is connected with the electromagnetic emission device (3), the capacitor bank (2) and the console (404) and is used for controlling the discharge of the electromagnetic emission device (3);
The time sequence control switch (403) is respectively connected with each group of capacitors of the capacitor group (2) in series, is controlled by the control console (404), and one end of the time sequence control switch is connected with the electromagnetic emission device (3) through the switch b (402) and is used for controlling the capacitor group (2) to discharge according to a specified sequence and time interval;
The control console (404) comprises an alternating current/direct current control console and a time sequence switch control console, and the alternating current/direct current control console controls the transformer (102) and the rectifier (103) in the charging loop (1); a time sequence switch console controls a switch a (401), a switch b (402) and a time sequence control switch (403);
The initial contact pressure adjusting device (5) and the contact pressure measuring module (6) are arranged on the electromagnetic transmitting device (3) and are respectively used for adjusting and measuring the contact pressure between the cuboid-shaped guide rail (301) and the armature (302) in the electromagnetic transmitting device (3);
the initial contact pressure adjusting device (5) comprises a right adjusting plate (501), a left adjusting plate (502) and an adjusting rod (503);
The initial contact pressure adjusting device (5) is made of glass or bakelite;
the right adjusting plate (501) and the left adjusting plate (502) are respectively provided with a groove, and the grooves are internally carved with scores with the same slope as the tangential line of the peripheral threads of the adjusting rod (503); the grooves of the right adjusting plate (501) and the left adjusting plate (502) are oppositely combined in the forward direction to form a quadrangular pyramid hole, and the outline of the hole is the same as that of the adjusting rod (503); the slope of a bus of the hole quadrangular pyramid is the same as that of a bus of the frustum of the regulating rod (503), and the small bottom surface area of the regulating rod (503) is between the two bottom surface areas of the quadrangular pyramid;
An operation hole is formed in the bottom surface of the large diameter of the adjusting rod (503), so that the adjusting rod (503) can be screwed into a quadrangular pyramid hole formed when the right adjusting plate (501) and the left adjusting plate (502) are combined by a tool to perform pressure adjusting operation;
The adjusting rod (503) is a frustum, threads are arranged on the periphery of the adjusting rod, and the tangential slopes of the threads on all the periphery of the frustum are the same;
The contact pressure measurement module (6) comprises a pressure measurement probe (601) and a detection module (602), wherein the pressure measurement probe (601) is a plurality of pressure measurement probes, and the pressure measurement probes are uniformly arranged on the outer side of the cuboid guide rail (301) and are parallel to the cuboid guide rail (301) and are arranged in the groove (306);
The pressure measurement probe (601) comprises an insulating block (6011) and a flexible pressure sensor (6012); the flexible pressure sensor (6012) is clamped between the two insulating blocks (6011), and an opening (305) is formed in the side wall of the fixed plate (304) so as to allow a lead of the flexible pressure sensor (6012) to enter and exit;
the insulating block (6011) is made of glass or bakelite.
2. A contact pressure measuring method of an electromagnetic emission simulation experiment platform capable of adjusting initial contact pressure, characterized in that the method uses the electromagnetic emission simulation experiment platform capable of adjusting initial contact pressure as claimed in claim 1, and comprises the following steps:
1) Confirming that the charging loop (1) and the capacitor bank (2) are reliably grounded; checking and confirming that the charging loop (1), the capacitor bank (2), the electromagnetic transmitting device (3), the control system (4), the initial contact pressure adjusting device (5) and the contact pressure measuring module (6) are connected, and all components are in a standby working state;
2) An armature (302) in the electromagnetic emission device (3) is placed in the middle of a cuboid-shaped guide rail (301);
3) Placing an initial contact pressure adjusting device (5) in the middle of the armature (302) to enable the initial contact pressure adjusting device to give a certain initial pressure to the contact surface of the armature and the cuboid-shaped guide rail (301), and recording the value of the contact pressure as a reference contact pressure;
4) Closing a switch of the charging loop (1), pressurizing the capacitor bank (2) by using the control system (4) to charge the capacitor bank to the required voltage;
5) Stopping the charging circuit (1) from charging the capacitor bank (2) and simultaneously starting the capacitor bank (2) to discharge the cuboid-shaped guide rail (301);
6) Recording the pressure change measured by the contact pressure measuring module (6) during the movement of the armature (302) and the speed of the armature (302) when flying out of the cuboid-shaped guide rail (301);
7) Adjusting the pressure of the initial contact pressure adjusting device (5), repeating the steps 4) -6) under the voltage of the step 4), and comparing the flying speed of the armature (302) measured each time with the flying speed of the armature (302) measured last time;
8) Repeating steps 4) -7) until the maximum flying-out speed of the armature (302) is obtained, wherein the pressure measured by the contact pressure measuring module (6) is the optimal contact pressure; thus, the contact pressure change condition in the armature moving process can be measured, and the contact pressure required by the maximum moving speed can be obtained;
in the step 3), in the initial pressure regulating device, the regulating rod (503) is rotated to enter into a hole of a quadrangular pyramid formed by the right regulating plate (501) and the left regulating plate (502) to a certain depth;
In the step 7), the pressure of the initial contact pressure adjusting device (5) is adjusted by rotating the adjusting rod (503) into the hole of the quadrangular pyramid formed by the right adjusting plate (501) and the left adjusting plate (502) to a deeper depth than before.
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