CN107610795B - Electron gun overhauling equipment under nuclear radiation environment - Google Patents
Electron gun overhauling equipment under nuclear radiation environment Download PDFInfo
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- CN107610795B CN107610795B CN201710954714.XA CN201710954714A CN107610795B CN 107610795 B CN107610795 B CN 107610795B CN 201710954714 A CN201710954714 A CN 201710954714A CN 107610795 B CN107610795 B CN 107610795B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention relates to electron gun maintenance equipment in a nuclear radiation environment, which comprises an electric control system, a maintenance platform, a trolley running track, a vulnerable part replacement device, an electron gun transportation trolley, an electron gun, a high-voltage electric interface module and a low-voltage electric interface module, wherein the electric control system is used for controlling the maintenance platform to move along with the trolley running track; the trolley running rail positioned at the rear side of the table top of the overhaul platform is of a linear rail structure, and a rack is further arranged on the top rail surface of the trolley running rail positioned at the front side of the table top of the overhaul platform; the electron gun transfer trolley is used for carrying an electron gun and runs on a trolley running track and comprises a trolley main body, a spring pressure switch, a trolley motor, a spring energy accumulator, a transmission mechanism, driving wheels, driven wheels and a motor-end-free S-pole permanent magnet. The invention has reasonable and compact structural design, can work in nuclear radiation environment, and especially has safe and stable operation of the electron gun operation trolley, complete functions, high reliability and complete working mechanism.
Description
Technical Field
The invention relates to an automatic control device for electron gun maintenance in a neutron nuclear radiation environment, in particular to an electron gun maintenance device in a nuclear radiation environment.
Background
With the development and utilization of nuclear energy and nuclear technology, nuclear radiation sources are increasingly used in the fields of industry, agriculture, medical treatment, scientific research, education, and the like. However, with the wide use of nuclear technology, nuclear accidents also occur continuously, such as nuclear leakage accidents of the Fudao nuclear power plant in northeast China in 2011, which occur in 3 months and 11 days, and a large amount of radioactive substances are put into the surrounding environment, so that the radioactive substances cannot be cleaned effectively by personnel alone, and the radioactive substances cannot be cleaned by radiation-proof robots at present, but because of strong radiation in the region, electronic components of equipment are too many (expensive), and the equipment cannot be cleaned effectively and stably, and finally the radioactive substances cannot be cleaned by people.
Currently, electron guns have been widely used in various fields such as television display tubes, oscilloscopes, and 3D printing of molten metal. In the nuclear industry, electron guns are mainly used to emit high performance electron beams. When the electron gun has reached its life and has been damaged, there has been little investigation on how it can be safely and effectively removed from the environment with radiation, replaced and then introduced into the hot chamber, and the main reasons for this are:
(1) Personnel safety considerations. The human body can cause dizziness, insomnia, skin redness, ulcer, alopecia, leukemia and vomiting after receiving nuclear radiation; in severe cases, canceration, aberration, hereditary lesions and the like can be caused, and the physical health of several generations is affected.
(2) Device stability considerations. In a nuclear radiation environment, conventional electronic devices may be damaged or even fail to different degrees, because the electronic devices often include a large number of sensing devices and executing devices, and the electronic devices often fail after long-time high-energy nuclear radiation (neutron radiation and gamma radiation) passes.
In view of the above-mentioned problems and the specific circumstances of the present patent, it is necessary to design an electron gun carrying apparatus considering the carrying of an electron gun emitter.
Disclosure of Invention
Aiming at the problems, the invention provides the electron gun maintenance equipment which has reasonable and compact structural design, can work in a nuclear radiation environment, and particularly has safe and stable operation of an electron gun operation trolley, complete functions, high reliability and complete working mechanism in the nuclear radiation environment.
The technical scheme of the invention is as follows:
The electron gun maintenance equipment in the nuclear radiation environment comprises an electric control system, a maintenance platform, a trolley running rail, a vulnerable part replacement device, an electron gun transfer trolley, an electron gun, a high-voltage electric interface module and a low-voltage electric interface module; the maintenance platform is arranged on the ground, the trolley running rail is arranged on the maintenance platform table top, the trolley running rail positioned at the rear side of the maintenance platform table top is of a linear rail structure, and a rack is further arranged on the top rail surface of the trolley running rail positioned at the front side of the maintenance platform table top; the electron gun transfer trolley is used for carrying an electron gun and runs on the trolley running track and comprises a trolley main body, a spring pressure switch, a trolley motor, a spring energy accumulator, a transmission mechanism, driving wheels, driven wheels and a motor-end-free S-pole permanent magnet; the motor-free end S-pole permanent magnet is arranged on the trolley running track; the frame of the trolley main body is made of stainless steel materials or hydrogen-containing composite materials which can shield neutrons; a positioning N-pole electromagnet is arranged at the bottom of the right half section of the trolley main body, and is attracted with the non-motor end S-pole permanent magnet when the positioning N-pole electromagnet is electrified; the spring pressure switch is a pair of the front and rear ends of the trolley body and is electrically connected with the electric control system; the trolley motor is arranged in the left half section of the trolley main body and is electrically connected with the electric control system, and a protective cover made of stainless steel materials is arranged outside the trolley motor; the spring energy accumulator is arranged in the left half section of the trolley main body; the transmission mechanism is arranged in the left half section of the trolley main body and is connected with the trolley motor or the clockwork spring energy accumulator; the driving wheels are uniformly arranged at the bottom of the front side of the trolley main body, are axially connected with the transmission mechanism, and are radially engaged with the racks in a matching way through teeth; the driven wheels are uniformly distributed at the bottom of the rear side of the trolley main body and are in rolling connection with the trolley running track positioned at the rear side of the table top of the overhaul platform; the vulnerable part replacing device is arranged on the table top of the first maintenance table and is positioned between the trolley running rails; the high-voltage electric interface module and the low-voltage electric interface module are arranged in the hot room, the high-voltage electric interface module and the low-voltage electric interface module are in front-back symmetry and parallel, and a trolley gear block is arranged between the right ends of the high-voltage electric interface module and the low-voltage electric interface module.
Electron gun overhauls equipment under nuclear radiation environment, wherein: the spring energy accumulator consists of an outer wheel disc, a spring, a plectrum connecting piece and an end surface sealing cover; a wheel disc shaft is axially arranged in the middle of the outer wheel disc and is connected with the transmission mechanism through the wheel disc shaft; the spring is of a coiled strip structure and is arranged in the outer wheel disc; the plectrum connecting piece is arranged at the middle gap of the spring; the end face sealing cover is arranged at one side end of the outer wheel disc and seals the spring and the plectrum connecting piece in the outer wheel disc.
Electron gun overhauls equipment under nuclear radiation environment, wherein: the transmission mechanism comprises a first bevel gear, a first straight gear, a first speed change gear pair, a second bevel gear, a second straight gear, a third bevel gear, a third straight gear and a second speed change gear pair; the first bevel gear is assembled and connected with a power output shaft of the trolley motor or the wheel disc shaft; the first straight gear is in matched engagement with the first bevel gear; the first speed change gear pair is positioned at the rear side of the first bevel gear and comprises a first speed change main gear and a first speed change auxiliary gear, the first speed change main gear is axially connected with the first straight gear through a connecting shaft, and the first speed change auxiliary gear is in matched engagement with the first speed change main gear; the second bevel gear is positioned in front of the first straight gear and is in matched engagement with the first straight gear; the second spur gear is in matched engagement with the second bevel gear; the third bevel gear is positioned at the front side of the second spur gear and is axially connected with the second spur gear through a connecting shaft; the third spur gear is in matched engagement with the third bevel gear; the second speed change gear pair is positioned at the rear side of the third straight gear and comprises a second speed change main gear and a second speed change auxiliary gear, the second speed change main gear is axially connected with the third straight gear through a connecting shaft, and the second speed change auxiliary gear is in matched engagement with the second speed change main gear.
Electron gun overhauls equipment under nuclear radiation environment, wherein: each driving wheel comprises a driving sliding block and a driving gear hinged to the middle of the outer side surface of the driving sliding block; the driving sliding block is of a structure with an L-shaped cross section, and a right-angle part is provided with a sliding groove with the L-shaped cross section in a left-right through way; the lower part of the trolley running track positioned at the front side of the overhaul platform surface is in matched sliding connection with the sliding groove; the driving gear is axially connected with the first speed changing pinion or the second speed changing pinion through a connecting shaft, and radial teeth of the driving gear are in matched engagement with the rack.
Electron gun overhauls equipment under nuclear radiation environment, wherein: each driven wheel comprises a driven sliding block and a driven wheel body hinged to the middle of the outer side face of the driven sliding block; the driven wheels are in rolling connection with the trolley running track positioned at the rear side of the table top of the maintenance platform through the driven wheel body.
Electron gun overhauls equipment under nuclear radiation environment, wherein: the overhaul platform is arranged on the ground and comprises a first overhaul stand, a second overhaul stand and a third overhaul stand; a first sealing door is vertically arranged between the first overhaul stand and the second overhaul stand; a wall body is vertically arranged between the second overhaul stand and the third overhaul stand, the bottom of the wall body is arranged on the ground, and a wall body tunnel is horizontally penetrated through the middle upper part of the wall body; a second sealing door is vertically arranged between the left tunnel portal of the wall tunnel and the second overhaul stand; and a third sealing door is vertically arranged between the right side tunnel portal of the wall tunnel and the third overhaul stand.
Electron gun overhauls equipment under nuclear radiation environment, wherein: the trolley running track is four sections arranged on the table top of the overhaul platform, one section is a turning track, and the other three sections are horizontal linear tracks; each section of trolley running track is a pair of which the cross section is L-shaped.
Electron gun overhauls equipment under nuclear radiation environment, wherein: the electric control system is arranged in the control room and comprises a power supply, a ammeter A, switches K1-K4, a spring relay KT1, a front side interface relay KT2, a rear side interface relay KT3, a stop block relay KT4, contactors KM 1-KM 2 and the positioning N-pole electromagnet; the rear side interface relay KT3 is arranged inside the low-voltage power interface module, and the front side interface relay KT2 is arranged inside the high-voltage power interface module; the ammeter A is connected in series with the negative electrode of the power supply; the contactors KM1 and KM2 are connected in parallel to two ends of a serial body of the power supply and the ammeter A; one end of the spring pressure switch is connected with the ammeter A and is connected to the negative electrode of the power supply through the ammeter A, and the other end of the spring pressure switch is connected to one end of the trolley motor; the other end of the trolley motor is connected with the positive electrode of the power supply; the switch K1 is connected with the clockwork relay KT1 in series, and the series body of the switch K1 and the clockwork relay KT1 is connected in parallel with two ends of the series body of the power supply and the ammeter A; the switch K2 is also connected in series with the relay KT3 at the back side interface, and the serial bodies of the switch K2 and the relay KT3 at the back side interface are connected in parallel with the two ends of the serial body of the power supply and the ammeter A; one end of the front side interface relay KT2 is connected between the switch K2 and the rear side interface relay KT3, and the other end of the front side interface relay KT2 is connected to the ammeter A and is connected to the negative electrode of the power supply through the ammeter A; the switch K3 is also connected in series with the stop block relay KT4, and the series body of the switch K3 and the stop block relay KT4 is connected in parallel with two ends of the series body of the power supply and the ammeter A; the switch K4 is connected with the positioning N-pole electromagnet in series, and the switch K4 is connected with the serial body of the positioning N-pole electromagnet in parallel at two ends of the serial body of the power supply and the ammeter A.
The beneficial effects are that:
the electron gun maintenance equipment in the nuclear radiation environment has reasonable and compact structural design, can work in the nuclear radiation environment, and particularly has safe and stable operation, complete functions, high reliability and complete working mechanism of the electron gun operation trolley; solves the following problems:
(1) In the nuclear radiation environment, workers cannot directly repair and replace the electron gun emission device;
(2) Under the nuclear radiation environment, the radiation problem of the radiation to the electronic components in the carrying trolley equipment;
(3) In nuclear radiation environment, electron gun transfer trolley has integrated multiple functions in order to adapt to its external environment of work, and the reply scheme after electron gun transfer trolley electrical control inefficacy:
meanwhile, the invention has the following advantages:
(1) The frame is made of stainless steel or a composite material with more hydrogen components, which is most effective for shielding the medium, and only the shielding is not absorbed, so that the nuclear corrosion to the frame is reduced, and the personal safety of workers in maintaining the vehicle body is ensured;
(2) The trolley is of a pure mechanical structure on the whole, so that the damage of radiation to an electrical system is reduced, the stability of the system is ensured, and when a motor in the system fails, a spring energy storage mechanism is adopted, so that the normal operation of the trolley is ensured;
(3) The inner wheel and the outer wheel of the trolley are in different forms, so that the smooth running of the trolley is ensured not to be blocked when the trolley turns;
(4) The spring pressure switch that the part set up around the dolly is according to the sealing door that the front and back end touched in the dolly to control motor pivoted return circuit makes the motor advance or retreat, has improved the degree of automation of system, has reduced personnel control error rate.
Drawings
FIG. 1 is a schematic diagram of an electron gun maintenance apparatus in a nuclear radiation environment of the present invention;
FIG. 2 is a schematic diagram of another embodiment of an electron gun maintenance apparatus in a nuclear radiation environment according to the present invention;
FIG. 3 is a schematic view of the automated replacement device for consumable parts of an electron gun maintenance apparatus in a nuclear radiation environment of the present invention;
FIG. 4 is a schematic structural view of a tooling fixture of electron gun maintenance equipment in a nuclear radiation environment;
FIG. 5 is a schematic plan view of an automated replacement device for a consumable part of an electron gun service apparatus in a nuclear radiation environment of the present invention;
FIG. 6 is a schematic structural view of a tooling fixture of electron gun maintenance equipment in a nuclear radiation environment;
FIG. 7 is a state diagram of an electron gun transport trolley of electron gun maintenance equipment in a nuclear radiation environment of the present invention passing through a gap between two adjacent trolley running rails;
FIG. 8 is a layout of the trolley running track of the electron gun maintenance apparatus in the nuclear radiation environment of the present invention;
FIG. 9 is a layout of a high voltage electrical interface module and a low voltage electrical interface module of the electron gun maintenance apparatus in a nuclear radiation environment of the present invention;
FIG. 10 is an exploded view of the spring energy accumulator of the electron gun service apparatus in the nuclear radiation environment of the present invention;
FIG. 11 is a top view of an electron gun transport cart of an electron gun maintenance apparatus in a nuclear radiation environment of the present invention;
FIG. 12 is a layout of driven wheels of an electron gun transport trolley and a trolley running track of electron gun maintenance equipment in a nuclear radiation environment of the present invention;
FIG. 13 is a layout of the drive wheels of the electron gun transport cart and the cart running track of the electron gun maintenance apparatus in a nuclear radiation environment of the present invention;
FIG. 14 is a control circuit diagram of electron gun maintenance equipment in the nuclear radiation environment of the present invention;
fig. 15 is a circuit diagram of the triggering of the clockwork accumulator of the electron gun service apparatus in the nuclear radiation environment of the present invention.
Detailed Description
The present invention will be further described with reference to specific embodiments, and the terms "front, rear, left, right, upper, lower, top, bottom" and the like used herein are oriented in the same manner as in fig. 2, 9, 11 and 13.
As shown in fig. 1 to 15, the electron gun maintenance equipment in the nuclear radiation environment comprises a maintenance platform 1, a trolley running rail 2, a wearing part replacing device 3, an electron gun transfer trolley 4, an electron gun 5, a high-voltage electric interface module 6, a low-voltage electric interface module 7 and an electric control system.
The overhaul platform 1 is arranged on the ground and comprises a first overhaul stand 11, a second overhaul stand 12 and a third overhaul stand 13; wherein the first, second and third service tables 11, 12 and 13 have the same height; wherein, a first sealing door 14 is vertically arranged between the first overhaul stand 11 and the second overhaul stand 12; the top of the second maintenance platform 12 is also provided with a box body 121; a wall body 15 is vertically arranged between the second overhaul stand 12 and the third overhaul stand 13, the bottom of the wall body 15 is arranged on the ground, a wall body tunnel 151 is horizontally penetrated at the middle upper part of the wall body 15, and the bottom surface in a passage hole of the wall body tunnel 151 and the table surfaces of the first overhaul stand 11, the second overhaul stand 12 and the third overhaul stand 13 are positioned on the same horizontal line; a second sealing door 16 is vertically arranged between the left tunnel portal of the wall tunnel 151 and the second overhaul stand 12; a third sealing door 17 is vertically arranged between the right tunnel portal of the wall tunnel 151 and the third maintenance platform 13. Meanwhile, the third service table 13 is located in the hot room.
The trolley running track 2 is four sections arranged on the table top of the overhaul platform 1, wherein one section is a turning track and is arranged in the hot chamber, and the other three sections are horizontal linear tracks and are arranged on the table top of the overhaul platform 1; each section of trolley running track 2 is a pair of which the cross section is L-shaped, the trolley running track 2 positioned at the rear side of the table top of the overhaul platform 1 is of a linear track structure, and a rack 21 is further arranged on the track surface at the top of the trolley running track 2 positioned at the front side of the table top of the overhaul platform 1.
As shown in fig. 2 and 3, the quick-wear part replacing device 3 is arranged between trolley running rails 2 on the table surface of a first overhaul table 11 of the overhaul platform 1, and comprises a quick-wear part replacing base 31, an upright post 32, an electron gun overhaul device 33, a fixture 34, a chain hanging mechanism 35, a containing box 36, an upright post X-direction driving motor 37 and a fixture Z-direction driving motor 38; the quick-wear part replacing base 31, the upright post 32, the electron gun overhauling device 33, the tool clamp 34, the chain hanging mechanism 35, the upright post X-direction driving motor 37 and the tool clamp Z-direction driving motor 38 are all positioned in the accommodating box 36.
The quick-wear part replacing base 31 is fixedly arranged on the table surface of the first overhaul stand 11 of the overhaul platform 1, and a horizontal linear rail 311 is horizontally arranged on the top surface of the quick-wear part replacing base along the length direction of the first overhaul stand 11; the horizontal linear rail 311 is further provided with a stress strain gauge for detecting the horizontal pushing force of the upright post in real time.
The upright 32 comprises a pair of rear uprights 321 and a front upright 322, and the bottom ends of the rear uprights 321 and the front uprights 322 are respectively and slidably connected to a section of horizontal linear rail 311 on the top surface of the quick-wear part replacing base 31; a vertical linear rail 323 is longitudinally arranged on one side wall opposite to the rear upright post 321 and the front upright post 322; the rear upright 321 has an upper gear block 324 at its upper end and a lower gear block 325 at its lower end. The upright X-direction driving motor 37 is disposed at one side of the bottom end of the upright 32, and its power output end is connected with the rear upright 321 and the front upright 322 in a matching manner, so as to drive the rear upright 321 and the front upright 322 to simultaneously slide along the horizontal linear rail 311.
The electron gun maintenance device 33 is disposed on the wearing part replacement base 31, and comprises a left maintenance seat 331 and a right maintenance seat 332; the left and right service seats 331 and 332 are arranged in parallel with each other; the left overhauling seat 331 is located between the left ends of the horizontal linear rails 311, and the right overhauling seat 332 is located between the right ends of the horizontal linear rails 311. The vulnerable part is provided with two holes with the diameter of 9mm, the wheelbase of the two holes is 16mm, the error is in the interval of 0.1mm, the electron gun overhauling device 33 is directly connected with two cylindrical contact pins of the vulnerable part to be used for placing the vulnerable part, the vulnerable part is exposed and then is subjected to the work of pulling out and inserting through the tool fixture 34, the axial force about 50N is required for pulling out and inserting the vulnerable part, and the connecting screw for assisting in fixing the vulnerable part is also required to be screwed and loosened in the replacing engineering of the vulnerable part.
The fixture 34 is mounted on a pair of posts 32 and moves linearly on a vertical linear rail 323 between an upper gear block 324 and a lower gear block 325; the work fixture 34 includes a rear worm drive motor 340, a rear slide arm 341, a front slide arm 342, a clamp mount 343, a clamp block 344, a rear worm 345, a front worm 346, a rolling clamp wheel 347, a laser displacement sensor 348, and a front worm drive motor 349.
One end of the rear sliding arm 341 is slidably connected to the vertical linear rail 323 of the rear upright 321, and the other end is fixedly connected to the left side wall of the clamping seat 343; one end of the front sliding arm 342 is slidably connected to the vertical linear rail 323 of the front upright 322, and the other end is fixedly connected to the right side wall of the clamping seat 343. The Z-direction driving motor 38 is disposed outside one side of the rear sliding arm 341 or the front sliding arm 342, and the power output end of the Z-direction driving motor is connected to the rear sliding arm 341 or the front sliding arm 342, so as to drive the whole fixture 34 to slide up and down along the vertical linear rail 323 of the upright post 32. The clamping seat 343 is fixed between the rear sliding arm 341 and the front sliding arm 342, and a groove 3431 is formed in the middle of the top surface; the clamping block 344 is disposed in the groove 3431 of the clamping seat 343, and has a V-shaped groove 3441 at the top center thereof; the front and rear inner groove walls and the groove bottom of the upper end of the V-shaped groove 3441 are provided with rolling pinch wheels 347. The rear worm drive motor 340 and the rear worm 345 are mounted inside the rear side of the clamping seat 343, and the front worm 346 and the front worm drive motor 349 are mounted inside the front side of the clamping seat 343; one end of the rear worm 345 is connected with the power output end of the rear worm driving motor 340, and the other end is connected with a rolling clamping wheel 347 positioned on the inner groove wall at the rear side of the V-shaped groove 3441; one end of the front worm 346 is connected with the power output end of the front worm driving motor 349, and the other end is connected with the rolling clamping wheel 347 positioned on the inner groove wall at the front side of the V-shaped groove 3441; the rolling pinch wheel 347 cooperates with the rear worm 345 and the front worm 346 to adjust the position of the replaced wearing part. The laser displacement sensor 348 is mounted to the left side of the front slot wall of the clamp block 344 for detecting the angle of the replacement part.
The chain hanging mechanism 35 is arranged right above the fixture 34 and comprises a chain hanging shell 351, a workpiece clamping component 352 and a chain hanging motor 353; the chain hanging shell 351 is a rectangular annular shell structure, the top end of the chain hanging shell is fixedly connected to the inner box top of the accommodating box 36 through four symmetrical fixing columns 354, and an annular track 355 is circumferentially arranged at the bottom end of the chain hanging shell. The workpiece clamping assembly 352 is provided with a plurality of annular tracks 355 which are arranged at the bottom end of the chain hanging shell 351, a plurality of new parts to be replaced are clamped on the workpiece clamping assembly 352, the workpiece clamping assembly 352 is compressed by adopting a spring, the end face is axially compressed in a compressing mode, an accurate initial position can be provided for the whole mechanism, and the burden is reduced for later adjustment. The chain hanging motor 353 is arranged on the outer wall of one end of the chain hanging shell 351, the power output end of the chain hanging motor 353 is connected with the workpiece clamping assembly 352 and drives the workpiece clamping assembly 352 to perform circular motion on the annular track 355, and then the replacement of vulnerable parts and the preservation of waste vulnerable parts are performed.
The electron gun transfer trolley 4 is used for carrying an electron gun 5 and runs on a trolley running track 2 on the table top of the overhaul platform 1, and comprises a trolley main body 41, a spring pressure switch 42, a trolley motor 43, a spring energy accumulator 44, a transmission mechanism 45, driving wheels 46, driven wheels 47 and a motor-end-free S-pole permanent magnet.
The frame of the trolley main body 41 is made of stainless steel material or composite material with more hydrogen components, etc. which is most effective for shielding the medium; the spring pressure switch 42 is a pair installed on the front and rear end surfaces of the carriage body 41, and is connected to an operation circuit of the control carriage motor 43 to control the operation of the carriage motor 43, thereby controlling the electron gun transfer carriage 4 to smoothly pass through the first sealing door 14, the second sealing door 16 and the second sealing door 17 in the course and to move to a designated position.
When the spring pressure switch 42 is in a closed state and contacts an obstacle, the spring pressure switch 42 is stressed, the spring is compressed, the switch is opened, the ammeter on the loop is displayed as 0, the obstacle is removed, the spring of the spring pressure switch 42 compressed starts to stretch, the switch for controlling the rotation of the trolley motor 43 is automatically closed, and the trolley motor 43 is driven to advance again.
The trolley motor 43 is arranged in the left half section of the trolley main body 41, and a protective cover made of a stainless steel material with strong radiation resistance is arranged outside the trolley motor to prevent the damage of nuclear radiation (neutron radiation) to the trolley motor 43.
The spring accumulator 44 is also arranged in the left half section of the trolley body 41, and consists of an outer wheel disc 441, a spring 442, a plectrum connecting piece 443 and an end face sealing cover 444; the spring accumulator 44 is also provided with a stop switch; a wheel disc shaft 445 is axially arranged in the middle of the outer wheel disc 441 and is connected with the transmission mechanism 45 through the wheel disc shaft 445; the spring 442 is in a coiled structure and is arranged inside the outer wheel disc 441; the plectrum connecting piece 443 is arranged in the gap of the middle part of the spring 442; the end cover 444 covers one side end of the outer wheel 441 and encloses the spring 442 and the paddle connector 443 inside the outer wheel 441.
The spring accumulator 44 is used to prevent the electron gun transport trolley 4 from being able to continue operating due to a failure of the electrical system under nuclear radiation conditions, and provides another driving force for the electron gun transport trolley 4, ensuring that the electron gun 5 can eventually exit all sealing doors. The spring accumulator 44 stores energy in the wound spring 442 in advance, and is triggered only when the drive of the carriage motor 43 fails, and outputs the spring energy from the transmission mechanism 45 connected to the outer wheel 441. The spring energy accumulator 44 is used for releasing the mechanical energy stored in advance to replace the trolley motor 43 by opening a stop switch of the spring energy accumulator 44 under the condition that an electric system in the electron gun transfer trolley 4 is completely disabled after nuclear radiation, so as to provide driving force for the transmission mechanism 45 and drive the electron gun transfer trolley 4 to withdraw.
The transmission mechanism 45 is installed inside the left half section of the dolly main body 41, and includes a first bevel gear 451, a first spur gear 452, a first speed change gear pair 453, a second bevel gear 454, a second spur gear 455, a third bevel gear 456, a third spur gear 457, and a second speed change gear pair 458. Wherein the first bevel gear 451 is assembled and connected with the power output shaft of the trolley motor 43; the first straight gear 452 is in mating engagement with the first bevel gear 451; the first speed change gear pair 453 is located behind the first bevel gear 451 and comprises a first speed change main gear 4531 and a first speed change auxiliary gear 4532, the first speed change main gear 4531 is axially connected with the first straight gear 452 through a connecting shaft, and the first speed change auxiliary gear 4532 is in matched engagement with the first speed change main gear 4531; the second bevel gear 454 is located forward of the first spur gear 452 and is in mating engagement with the first spur gear 452; the second spur gear 455 is in mating engagement with the second bevel gear 454; the third bevel gear 456 is located at the front side of the second spur gear 455 and is axially connected to the second spur gear 455 by a connecting shaft; the third spur gear 457 is in mating engagement with a third bevel gear 456; the second ratio gear pair 458 is located at the rear side of the third spur gear 457 and includes a second ratio main gear 4581 and a second ratio pinion 4582, the second ratio main gear 4581 being axially connected to the third spur gear 457 by a connecting shaft, the second ratio pinion 4582 being in mating engagement with the second ratio main gear 4581.
The driving wheels 46 have a plurality of driving wheels 461 and driving gears 462 hinged to the middle of the outer side surface of the driving sliding blocks 461, and are uniformly arranged at the bottom of the front side of the trolley body 41; wherein the driving sliding block 461 has an L-shaped cross section and a right-angle part is provided with a sliding groove 463 with an L-shaped cross section along the left and right through directions; the lower part of the trolley running rail 2 positioned at the front side of the table surface of the overhaul table 1 is in matched sliding connection with the sliding chute 463; the driving gear 462 is axially connected to the first gear set 4532 of the first gear set 453 or the second gear set 4582 of the second gear set 458 via a connecting shaft, and the radial teeth of the driving gear 462 are in mating engagement with the rack 21 on the trolley running rail 2.
The driven wheels 47 have a plurality of driven wheels 471 and are uniformly arranged at the bottom of the rear side of the trolley body 41, and each driven wheel 47 comprises a driven slide 471 and a driven wheel body 472 hinged at the middle of the outer side surface of the driven slide 471; the driven wheel 47 is connected with the trolley running track 2 positioned at the rear side of the surface of the maintenance platform 1 in a rolling way through the driven wheel body 472.
The permanent magnet of the motor-free end S pole is arranged on the trolley running track 2 and is matched and attracted with the positioning N pole electromagnet when the trolley running track is electrified.
The high-voltage electrical interface module 6 and the low-voltage electrical interface module 7 are arranged in a hot room, the high-voltage electrical interface module 6 and the low-voltage electrical interface module 7 are in front-back symmetry and parallel, and a trolley limiting block 8 is arranged between the right ends of the high-voltage electrical interface module 6 and the low-voltage electrical interface module 7; the high-voltage electric interface module 6 and the low-voltage electric interface module 7 are internally provided with interfaces connected through springs.
The electric control system is arranged in a control room and comprises a power supply, a ammeter A, switches K1-K4, a spring relay KT1, a front side interface relay KT2, a rear side interface relay KT3, a stop block relay KT4, a positioning N-pole electromagnet and contactors KM 1-KM 2; wherein, the ammeter A is connected in series with the cathode of the power supply; the contactors KM1 and KM2 are connected in parallel to two ends of a serial body of a power supply and an ammeter A; one end of the spring pressure switch 42 is connected with the ammeter A and is connected to the negative electrode of the power supply through the ammeter A, and the other end of the spring pressure switch is connected to one end of the trolley motor 43; the other end of the trolley motor 43 is connected with the positive electrode of a power supply; the switch K1 is connected with the clockwork relay KT1 in series, and the series body of the switch K1 and the clockwork relay KT1 is connected in parallel with two ends of the series body of the power supply and the ammeter A; the spring relay KT1 is connected to a stop switch of the spring accumulator 44. The switch K2 is also connected in series with the relay KT3 at the back side interface, and the series body of the switch K2 and the relay KT3 at the back side interface is connected in parallel with the two ends of the series body of the power supply and the ammeter A; one end of the front side interface relay KT2 is connected between the switch K2 and the rear side interface relay KT3, and the other end of the front side interface relay KT is connected to the ammeter A and is connected to the negative electrode of the power supply through the ammeter A; the switch K3 is also connected in series with the relay KT4 at the stop block, and the series body of the switch K3 and the relay KT4 at the stop block is connected in parallel with the two ends of the series body of the power supply and the ammeter A; the switch K4 is connected with the positioning N-pole electromagnet in series, and the switch K4 is connected with the positioning N-pole electromagnet (the positioning N-pole electromagnet is arranged at the bottom of the right half section of the trolley body 41) in parallel at two ends of the serial body of the power supply and the ammeter A; when the switch K4 is turned on, the positioning N-pole electromagnet is electrified to generate N-pole magnetism, the N-pole electromagnet is attracted with the permanent magnet at the end without the motor on the trolley running track 2, then the right half section of the trolley main body 41 is stopped, the left half section of the trolley main body 41 is continuously moved to a proper place under the control of the control room, the separation of the electron gun transfer trolley 4 is realized, and then the automatic replacement system is used for replacing the internal vulnerable parts. Wherein, this back side interface department relay KT3 sets up inside the low voltage electric interface module 7, and this front side interface department relay KT2 sets up inside the high voltage electric interface module 6.
The working flow of the invention is as follows:
the electron gun transfer trolley 4 carrying the electron gun 5 is placed at the starting position of the trolley running track 2, the trolley running track 2 is powered on in a control room, the 4-section trolley running track 2 is connected with an external power supply in a serial connection mode by using a penetrating piece for assisting in realizing, the switch KM1 is closed, a motor loop starts to supply power, the trolley motor 43 on the electron gun transfer trolley 4 is further driven, and the driving wheel 46 and the driven wheel 47 of the electron gun transfer trolley 4 are driven to move on the trolley running track 2 until reaching the first sealing door 14. The front end of the trolley body 41 is provided with a spring pressure switch 42 (comprising a control switch KP and a spring), the spring pressure switch 42 is in a closed state all the time, when the spring pressure switch 42 is stressed and the spring is compressed when the spring pressure switch contacts the first sealing door 14, the control switch KP is opened, and a ammeter A on the loop is displayed as 0 at the moment, so that the electron gun transfer trolley 4 moves to the position of the first sealing door 14, and the electron gun transfer trolley 4 waits for the first sealing door 14 to be opened.
Opening the first sealing door 14, starting the extension of the spring pressure switch 42 compressed by the thrust force at the front end of the trolley body 41, controlling the rotation of the trolley motor 43, automatically closing the control switch KP of the spring pressure switch 42, and driving the motor 43 again to enable the electron gun transport trolley 4 to continue to advance; a plurality of groups of wheels at the lower part of the trolley main body 41, wherein one group slowly begins to hang in the middle of the two sections of trolley running rails 2; due to the overall weight of the car body and the trolley running rail 2 which can be designed in a bearing way, the suspended trolley running rail 2 can be ensured to keep a straight line with other groups of small wheels. Under the drive of 2 groups of small wheels, the suspended small wheels of the first group and the second section are connected with the trolley running rails 2 with arc chamfers of 5mm in a butt joint mode, and then each group of small wheels sequentially pass through the middle positions of the two groups of trolley running rails 2. When the trolley has completely entered the trolley running rail 3 of the second group, until the trolley reaches the second sealing door 16, the whole circuit is disconnected again, the current being 0. At this time, the first sealing door 14 is controlled to be closed, the second sealing door 16 is opened, and next, the electron gun transfer cart 4 is ready to pass through the second sealing door 16.
After the second sealing door 16 is opened, the wheels of the electron gun transfer trolley 4 pass through the suspension part between the two sections of trolley running rails 2 again in the same manner, enter the extension port of the wall body 15, gradually move into the tunnel of the wall body 15, then the electron gun transfer trolley 4 reaches the position of the third sealing door 17, the second sealing door 16 is controlled to be closed, the third sealing door 17 is opened, and the electron gun transfer trolley 4 starts to move again and enters the hot chamber.
The electron gun transfer trolley 4 passes through a section of curved track, because the travel of the front side and the rear side of the trolley travel track 2 is different in length when turning, at this time, the driving gear 462 at the front side of the electron gun transfer trolley 4 is responsible for accurate driving, the rear side is the driven wheel 47, a small amount of sliding distance can be provided for the driven wheel 47 to a certain extent, smoothness of the whole movement is ensured, thereby ensuring that the electron gun transfer trolley 4 smoothly passes through the curved track and continuously moves until the electron gun transfer trolley 4 moves to the position of the trolley limiting block 8, at this time, the spring of the spring pressure switch 42 is pressed to control the switch KP to be disconnected, the current above the loop is controlled to be 0 by the trolley motor 43 again, the electron gun transfer trolley 4 stops moving, the connection port is ready to be started, and the third sealing door 17 is controlled to be closed.
The connection process is that the interfaces of a relay KT2 at the front side interface and a relay KT3 at the rear side interface are connected and clamped, a switch K2 is closed, and a high-voltage electric interface module 6 and a high-voltage electric interface module 7 which are symmetrically distributed in a hot chamber are pushed by a control mode of the relay KT2 at the front side interface and the relay KT3 at the rear side interface, so that the matched interfaces of a water pipe and an air pipe on the high-voltage electric interface module 6 and the high-voltage electric interface module 7 quickly slide into a designated interface position on an electron gun 5; the interface (water pipe interface, air pipe interface, high-voltage interface) on the electron gun 5 is connected under the condition that the relay KT2 at the front side interface and the relay KT3 at the back side interface are electrified, the interface on the electron gun 5 is connected in a pressing-in mode, the pressing-in force is determined by the design characteristics of the relay KT2 at the front side interface and the relay KT3 at the back side interface, and after connection is successful, the electron gun 5 enters a working state.
After the electron gun 5 works smoothly, the electron gun 5 starts to integrally withdraw; firstly, a switch KM1 is opened, a switch KM2 is closed, and a trolley motor 43 is connected in a reverse wiring way; the switch K2 is disconnected, so that the relay KT2 at the front side interface and the relay KT3 at the rear side interface are disconnected, and the interfaces of the relay KT2 at the front side interface and the relay KT3 at the rear side interface are returned to the initial state due to the release of the spring tension of the high-voltage electric interface module 6 and the low-voltage electric interface module 7. At the moment, a switch K3 of an electromagnetic relay KT3 at the gear block is closed, the trolley limiting block 8 moves rightwards, so that a spring of the spring pressure switch 42 is stopped from contacting with the trolley limiting block 8, a switch KP of the spring pressure switch 42 is automatically closed, and a trolley motor 43 supplies reverse current to reverse; according to the reverse flow of the entering process, exiting the connection work; then the switch KM2 is turned off in the form of the previous entry into the hot chamber and through the first sealing door 14, the second sealing door 16 and the third sealing door 17, exiting in reverse direction the hot chamber, the wall 15 and the outer chamber in sequence and finally reaching the initial position of the outer space.
Checking the whole electron gun maintenance equipment, and if no fault occurs, preparing to enter into the work again, and entering into the next new stroke; if some vulnerable parts are found to have faults and problems by inspection, the vulnerable part replacement device 3 immediately performs the vulnerable part replacement work; closing the switches KM2 and K4, moving the electron gun transferring trolley 4 into the vulnerable part replacing device 3 until the position of the N-pole electromagnet which is exactly attracted with the S-pole permanent magnet of the non-motor end on the electron gun transferring trolley 4 is reached, stopping the movement of the non-motor driving end of the electron gun transferring trolley 4 under the action of attraction force between magnetic poles, and continuing to move forwards under the driving of the trolley motor 43 to separate the electron gun 5 into two parts and expose vulnerable parts which need to be replaced, opening the switch KM2 at the moment, and enabling the electron gun transferring trolley 4 to be stationary at the proper position for replacing the vulnerable parts; then, the tool fixture 34 reaches the position of the vulnerable part under the driving of the rear upright post 321, the front upright post 322, the vertical linear rail 323 and the horizontal linear rail 311, and then tightly clamps the damaged vulnerable part and applies an axial force with proper magnitude to pull out the vulnerable part from the electron gun 5. When the tool clamp 34 moves upward along the vertical linear rail 323 and reaches the upper gear block 324, the damaged vulnerable part taken out from the electron gun 5 is put into the empty position of the chain hanging mechanism 35, so that the movable storage work of the damaged vulnerable part is completed. The chain hanging motor 353 of the chain hanging mechanism 35 is started to drive the chain hanging mechanism 35 to perform the circular motion, at this time, the chain hanging mechanism 35 moves to the next position and removes the damaged vulnerable part which is already placed, and a new vulnerable part is transported. After the new vulnerable part is clamped by the tool fixture 34 and moved to the position of the lower gear block 325, the replaced vulnerable part is reinserted into the electron gun 5 by controlling the linear motion of the trolley in the direction of the running track 2 and applying an axial force with proper magnitude, the connecting screw for connecting the vulnerable part and the electron gun 5 is screwed, and then the tool fixture 34 continues to move vertically upwards for a certain distance and waits for the next instruction for replacing the vulnerable part. The switch K4 is opened, the switch KM1 is closed, the two parts of the electron gun 5 are combined into one again, and the electron gun withdraws from the vulnerable part replacing device 3 along the direction of the trolley running track 2, so that the whole vulnerable part replacing work is completed. After the vulnerable part is replaced or the fault is removed, the electron gun transfer trolley 4 enters the next new journey again.
The invention relates to an emergency treatment measure of electron gun maintenance equipment in nuclear radiation environment, which comprises the following steps:
1) Because the electron gun maintenance device in the nuclear radiation environment of the present invention operates in the hot chamber nuclear radiation and neutron radiation environments, the radiation is likely to cause serious damage to the electrical system, such as the trolley motor 43 and the electrical control system, of the electron gun maintenance device in the nuclear radiation environment of the present invention, and therefore, after the electron gun maintenance device in the nuclear radiation environment of the present invention fails, a non-electrical system scheme is adopted to mechanically drive the electron gun transfer trolley 4.
2) The mechanical power source drive is a mechanism for storing energy by using a spring, which is pre-tensioned and arranged inside the electron gun transfer trolley 4 in advance, and the spring energy storage 44 is limited by a stop switch to release energy. When the electric control system of the electron gun maintenance equipment in the nuclear radiation environment fails, the electromagnetic trigger switch K1 is controlled to be closed, the electromagnetic valve KT1 controls the electromagnet thereof, and the stop switch is released. At this time, the spring energy accumulator 44 replaces the trolley motor 43, triggers the spring 442 to release energy, provides energy for the transmission mechanism 45, and drives the electron gun transfer trolley 4 to exit the hot chamber to reach the third sealing door 17; since the driving gear 462 and the rack 21 can completely retain the characteristics of mechanical energy when restricting movement, a limit switch is not required to be added; when the sealing door 17 is opened, the mechanical energy can be automatically triggered and released, and the back-off is continued until the sealing door is completely withdrawn.
The invention has reasonable and compact structural design, complete functions, high reliability, high working efficiency of the vulnerable part replacement device, good stability, convenient adjustment and maintenance of operators, high space utilization rate, high reliability and accurate positioning.
Claims (5)
1. An electron gun overhauling device under a nuclear radiation environment is characterized in that: the overhaul equipment comprises an electric control system, an overhaul platform, a trolley running rail, a vulnerable part replacement device, an electron gun transfer trolley, an electron gun, a high-voltage electric interface module and a low-voltage electric interface module;
the maintenance platform is arranged on the ground, the trolley running rail is arranged on the maintenance platform surface, the trolley running rail positioned on the rear side of the maintenance platform surface is of a linear rail structure, and a rack is further arranged on the top rail surface of the trolley running rail positioned on the front side of the maintenance platform surface;
the electron gun transfer trolley is used for carrying an electron gun and runs on the trolley running track and comprises a trolley main body, a spring pressure switch, a trolley motor, a spring energy accumulator, a transmission mechanism, driving wheels, driven wheels and a motor-free end S-pole permanent magnet; the motor-free end S-pole permanent magnet is arranged on the trolley running track; the frame of the trolley main body is made of stainless steel materials or hydrogen-containing composite materials which can shield neutrons; a positioning N-pole electromagnet is arranged at the bottom of the right half section of the trolley main body, and is attracted with the non-motor end S-pole permanent magnet when the positioning N-pole electromagnet is electrified; the spring pressure switch is a pair of the front and rear ends of the trolley body and is electrically connected with the electric control system; the trolley motor is arranged in the left half section of the trolley main body and is electrically connected with the electric control system, and a protective cover made of stainless steel materials is arranged outside the trolley motor; the spring energy accumulator is arranged in the left half section of the trolley main body; the transmission mechanism is arranged in the left half section of the trolley main body and is connected with the trolley motor or the clockwork spring energy accumulator; the driving wheels are uniformly arranged at the bottom of the front side of the trolley main body, are axially connected with the transmission mechanism, and are radially engaged with the racks in a matching way through teeth; the driven wheels are uniformly distributed at the bottom of the rear side of the trolley main body and are in rolling connection with the trolley running track positioned at the rear side of the table top of the overhaul platform;
The vulnerable part replacing device is arranged on the table top of the first maintenance table and is positioned between the trolley running rails;
the high-voltage electric interface module and the low-voltage electric interface module are arranged in the hot room, the high-voltage electric interface module and the low-voltage electric interface module are in front-back symmetry and are parallel, and a trolley gear block is arranged between the right ends of the high-voltage electric interface module and the low-voltage electric interface module;
the spring energy accumulator consists of an outer wheel disc, a spring, a plectrum connecting piece and an end surface sealing cover; a wheel disc shaft is axially arranged in the middle of the outer wheel disc and is connected with the transmission mechanism through the wheel disc shaft; the spring is of a coiled strip structure and is arranged in the outer wheel disc; the plectrum connecting piece is arranged at the middle gap of the spring; the end face sealing cover is covered at one side end of the outer wheel disc and seals the spring and the plectrum connecting piece in the outer wheel disc;
each driving wheel comprises a driving sliding block and a driving gear hinged to the middle of the outer side surface of the driving sliding block; the driving sliding block is of a structure with an L-shaped cross section, and a right-angle part is provided with a sliding groove with the L-shaped cross section in a left-right through way; the lower part of the trolley running track positioned at the front side of the overhaul platform surface is in matched sliding connection with the sliding groove; the driving gear is axially connected with the first speed changing pinion or the second speed changing pinion through a connecting shaft, and radial teeth of the driving gear are in matched engagement with the rack;
Each driven wheel comprises a driven sliding block and a driven wheel body hinged to the middle of the outer side face of the driven sliding block; the driven wheels are in rolling connection with the trolley running track positioned at the rear side of the table top of the maintenance platform through the driven wheel body.
2. An electron gun repair facility in a nuclear radiation environment according to claim 1, wherein: the transmission mechanism comprises a first bevel gear, a first straight gear, a first speed change gear pair, a second bevel gear, a second straight gear, a third bevel gear, a third straight gear and a second speed change gear pair; the first bevel gear is assembled and connected with a power output shaft of the trolley motor or the wheel disc shaft; the first straight gear is in matched engagement with the first bevel gear; the first speed change gear pair is positioned at the rear side of the first bevel gear and comprises a first speed change main gear and a first speed change auxiliary gear, the first speed change main gear is axially connected with the first straight gear through a connecting shaft, and the first speed change auxiliary gear is in matched engagement with the first speed change main gear; the second bevel gear is positioned in front of the first straight gear and is in matched engagement with the first straight gear; the second spur gear is in matched engagement with the second bevel gear; the third bevel gear is positioned at the front side of the second spur gear and is axially connected with the second spur gear through a connecting shaft; the third spur gear is in matched engagement with the third bevel gear; the second speed change gear pair is positioned at the rear side of the third straight gear and comprises a second speed change main gear and a second speed change auxiliary gear, the second speed change main gear is axially connected with the third straight gear through a connecting shaft, and the second speed change auxiliary gear is in matched engagement with the second speed change main gear.
3. An electron gun repair facility in a nuclear radiation environment according to claim 1, wherein: the overhaul platform is arranged on the ground and comprises a first overhaul stand, a second overhaul stand and a third overhaul stand; a first sealing door is vertically arranged between the first overhaul stand and the second overhaul stand; a wall body is vertically arranged between the second overhaul stand and the third overhaul stand, the bottom of the wall body is arranged on the ground, and a wall body tunnel is horizontally penetrated through the middle upper part of the wall body; a second sealing door is vertically arranged between the left tunnel portal of the wall tunnel and the second overhaul stand; and a third sealing door is vertically arranged between the right side tunnel portal of the wall tunnel and the third overhaul stand.
4. An electron gun repair facility in a nuclear radiation environment according to claim 1, wherein: the trolley running track is four sections arranged on the table top of the overhaul platform, one section is a turning track, and the other three sections are horizontal linear tracks; each section of trolley running track is a pair of which the cross section is L-shaped.
5. An electron gun repair facility in a nuclear radiation environment according to claim 1, wherein: the electric control system is arranged in the control room and comprises a power supply, a ammeter A, switches K1-K4, a spring relay KT1, a front side interface relay KT2, a rear side interface relay KT3, a stop block relay KT4, contactors KM 1-KM 2 and the positioning N-pole electromagnet; the rear side interface relay KT3 is arranged inside the low-voltage power interface module, and the front side interface relay KT2 is arranged inside the high-voltage power interface module;
The ammeter A is connected in series with the negative electrode of the power supply; the contactors KM1 and KM2 are connected in parallel to two ends of a serial body of the power supply and the ammeter A; one end of the spring pressure switch is connected with the ammeter A and is connected to the negative electrode of the power supply through the ammeter A, and the other end of the spring pressure switch is connected to one end of the trolley motor; the other end of the trolley motor is connected with the positive electrode of the power supply; the switch K1 is connected with the clockwork relay KT1 in series, and the series body of the switch K1 and the clockwork relay KT1 is connected in parallel with two ends of the series body of the power supply and the ammeter A; the switch K2 is also connected in series with the relay KT3 at the back side interface, and the serial bodies of the switch K2 and the relay KT3 at the back side interface are connected in parallel with the two ends of the serial body of the power supply and the ammeter A; one end of the front side interface relay KT2 is connected between the switch K2 and the rear side interface relay KT3, and the other end of the front side interface relay KT2 is connected to the ammeter A and is connected to the negative electrode of the power supply through the ammeter A; the switch K3 is also connected in series with the stop block relay KT4, and the series body of the switch K3 and the stop block relay KT4 is connected in parallel with two ends of the series body of the power supply and the ammeter A; the switch K4 is connected with the positioning N-pole electromagnet in series, and the switch K4 is connected with the serial body of the positioning N-pole electromagnet in parallel at two ends of the serial body of the power supply and the ammeter A.
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