CN100530467C

CN100530467C - Monostable self-locking type air gas variable permanent magnet operation device

Info

Publication number: CN100530467C
Application number: CNB2007101204858A
Authority: CN
Inventors: 朱学贵; 王毅
Original assignee: Beijing Jiaotong University
Current assignee: Beijing Jiaotong University
Priority date: 2007-08-20
Filing date: 2007-08-20
Publication date: 2009-08-19
Anticipated expiration: 2027-08-20
Also published as: CN101106026A

Abstract

The invention discloses a monostable self-locking variable air-gap permanent magnet operating mechanism which belongs to the field of medium and high-voltage electrical switches and is suitable for large opening distance and high-voltage circuit breakers. When used in medium-voltage circuit breakers, it can To reduce the excitation current and increase the electromagnetic force, the permanent magnet operating mechanism is mainly composed of a magnetic circuit system, a transmission system, a locking system and a support system. The permanent magnet of the magnetic circuit system is embedded between the inner and outer static iron cores; the electromagnetic coil is embedded in the coil slot formed by the inner and outer static iron cores and the moving iron core. There is an air gap, and the mandrel passes through the lock plate, the moving iron core, the opening spring in the magnetic circuit system, the end cover and the limit block from bottom to top, and is pressed on the limit block by a nut. The present invention can It can better control the opening and closing speed of the switch contacts, reduce contact collision and bounce, and is suitable for circuit breakers of different voltage levels, especially high-voltage vacuum circuit breakers with large opening distances, reducing excitation current and energy consumption. Higher reliability.

Description

Monostable self-locking type air gas variable permanent magnet operation device

Technical field

The invention belongs to middle and high piezoelectricity device field of switches.Be particularly related to a kind of Monostable self-locking type air gas variable permanent magnet operation device that is used with vacuum circuit-breaker.

Background technology

Because permanent magnet mechanism has high reliability, non-maintaining and good advantages such as power producing characteristics are used with vacuum circuit-breaker, are more and more widely used in the middle and high field of compressing switch.Along with the rising of applied voltage, contact of breaker is opened apart from increasing, and the moving stroke unshakable in one's determination of permanent magnet mechanism increases, and causes the combined floodgate starting current of mechanism to increase.The increase of exciting curent causes the control difficulty, and energy consumption increases, and heating is serious, and the aggravation of the collision between moving iron core and static iron core, and these are all very unfavorable to the reliably working of permanent magnet mechanism, has therefore influenced the popularization of permanent magnet mechanism and the application implementation in high pressure field.The kind of permanent magnet mechanism is more, structure has nothing in common with each other, majority is the pressure field that is used for 10KV-24KV, what can be used in the 40.5KV voltage levvl so far can only be minority, application permanent magnet mechanism in the 72.5KV level is only under test, but these mechanisms itself only are simple modifications and do not have the change of essence on the structure.For the current high pressure field that surpasses 100KV, almost not about using the research report of permanent magnet mechanism.Because the expansion of electricity market, high pressure even superhigh pressure power transmission and distribution market are very wide, and permanent magnet mechanism is applied to high pressure even superhigh pressure field, replace operating mechanisms such as spring mechanism, electromagnetic mechanism, will have very remarkable economical meaning and social effect.

Summary of the invention

The purpose of this invention is to provide a kind of Monostable self-locking type air gas variable permanent magnet operation device that is applicable to large opening, high-tension circuit-breaker, when being used for medium voltage breaker, can reducing exciting curent and strengthen electromagnetic force.It is characterized in that; Described permanent-magnet manipulating mechanism comprises mainly and being made up of four big systems such as magnetic circuit system, drive system, block sytem and support systems.

A magnetic circuit system, mainly form by moving iron core 10, outer static iron core 15, interior static iron core 17 and permanent magnet 20, be provided with air gap 28 at moving iron core 10, outer

static iron core

15,17 of Inner static iron cores, thereby constitute the path in permanent magnet 20 and solenoid 13 magnetic field that produces; Confining force when the permanent magnet 20 between static iron core 15, the interior static iron core 17 provides the mechanism "on" position outside; And, under the suction-combining force that permanent magnet 20 and solenoid 13 produce, moving iron core 10 along coaxial mandrel 8 earlier upwards null move LAP, air gap 28 is changed, can reduce the exciting curent of solenoid 13 and strengthen electromagnetic force;

Power and drive system, mainly by power line 7, solenoid 13, tripping spring 6, mandrel 8, pendulum pin 4, pull bar 5, adjusting nut 2 compositions such as grade, driving members such as pendulum pin 4, pull bar 5 and adjusting nut 2 are two, and symmetry is installed; Mandrel is coaxial with moving iron core, and can move to axial.When coil passes to switching current, moving

iron core

10 and 8 minutes three moved further of mandrel, moving iron core 10 LAP of can advancing in advance under the situation that is not subjected to counter-force substantially is then by drive system pulling mandrel, mandrel catches up with moving iron core, up to put in place or close a floodgate the preamble that puts in place just closing a floodgate; When the separating brake position, tripping spring 6 has certain pretightning force; When needs during from the closing position separating brake, as long as make solenoid 13 pass to less current, produce the magnetic field with permanent magnet 20 FRs, will move iron core 10, outer static iron core 15, Inner static iron core 17 separately;

A block sytem, mainly by lock collar 9, locking bolt 27, afterburning plug 26, lock pin 24, adjustable ring 22, retaining spring 25, back-moving spring 21, support spring 23 is formed; Lock collar 9 is linked together by bolt and moving iron core 10, and mandrel 8 passes lock collar 9, and square section of locking bolt 27 1 ends with lock collar 9 radial holes square section cooperates, and a smooth cylindrical end of locking bolt 27 play the guiding role to retaining spring 25; When mechanism is in gate-dividing state, in the groove of locking bolt 27 wedging mandrels 8, can screw afterburning plug 26 simultaneously; The key-way shape through hole that pull bar 5 passes pendulum pin 4 cooperates with adjusting nut 2, and adjusting nut 2 plays slide block at " sole " of pendulum pin 4; Because the counter-force effect of tripping spring 6, mandrel 8 can not moved to the combined floodgate direction, and locking bolt 27 make mandrel 8 and moving iron core 10 that relative motion not take place under the precompressed effect of retaining spring 25, prevent false switching, guaranteed that permanent magnet mechanism divides normally, combined floodgate and reliability.

A support system, by bearing 3, Bunper assembly 1, guide vane end stop 18, end cap 19, magnetic isolation plate 16, support and connect composition such as firm.Bearing 3 and magnetic isolation plate 16 respectively by bolt tightening on support (not drawing among the figure).Bearing 3 is used for installing the pendulum pin 4 of drive system.Buffer 1 when separating brake to 8 cushioning effects of mandrel.The stroke of 18 pairs of mandrels 8 of guide vane end stop limits.End cap 19 is used to support guide vane end stop 18, and mandrel 8 is play the guiding role.

The permanent magnet 20 of described magnetic circuit system is inlaid between Inner static iron core 17 and the outer static iron core 15; Solenoid 13 is flush-mounted in the coil groove that constitutes between Inner static iron core 17, outer static iron core 15 and the moving iron core 10, and it is fixing by epoxy resin ring 14 and Inner static iron core 17, outer static iron core 15, guard shield 11 is outside on static iron core 15, moving iron core 10 excircles, upper end and outer static iron core 15 relative fixed, leave air gap 28 between Inner static iron core 17, outer static iron core 15 and the moving iron core 10, moving iron core 10 is upper and lower mobile in guard shield 11 under the power effect of solenoid 13 magnetic fields generation, and air gap 28 is changed; Outer static iron core 15 is fixing by bolt 29 and magnetic isolation plate 16, Inner static iron core 17 is fixed by bolt 29 and end cap 19, magnetic isolation plate 16, guide vane end stop 18 places in the central recessed step cutting pattern of end cap 19, moving iron core 10 is linked together by bolt 30 with lock collar 9, pull bar 5 one ends are enclosed within on the lock collar 9 on first bearing pin 31, the other end of pull bar 5 is loaded onto adjusting nut 2 after passing the key-way shape through hole 4.1 of putting pin 4, after the formed product, adjusting nut 2 and pull bar 5 can be made into one; Pendulum pin 4 is installed on the bearing 3 by second bearing pin 32; " tiptoe " 4.3 of pendulum pin 4 constitutes the cam drive pair with the large end face of mandrel 8 8.1, and driving link is pendulum pin 4, and driven member is a mandrel 8; Tripping spring 6 multi-discs overlap in the centered cylinder chamber of magnetic circuit system, tripping spring 6, end cap 19 and guide vane end stop 18 backs that mandrel 8 passes in lock collar 9, moving iron core 10, the magnetic circuit system from bottom to up successively are pressed on the guide vane end stop 18 by a nut, and buffer 1 is supported in bearing 3 centre bores.

Described dynamic and static iron core is made by the electrical pure iron material of high magnetic conductivity, makes and other metal parts is a non-magnet material.

Described magnetic circuit system promptly moves iron core axisymmetricly, and inside and outside static iron core, solenoid are circle;

Described permanent magnet 20 is embedded between outer static iron core 15, the interior static iron core 17 for multi-disc, annular.

Described tripping spring 6 is by the paired closed assembly of multi-disc dish spring.

Three moved further of described moving iron core 10 and mandrel 8, in the phase I of motion, because " sole " 4.2 of the end face 2.1 of adjusting nut 2 and pendulum pin 4 has a segment distance, therefore moving iron core 10 will have one section idle stroke, " tiptoe " 4.3 of pendulum pin 4 do not contact with mandrel 8 as yet, and mandrel 8 is not action as yet; In the motion of second stage, when moving iron core 10 continues to rise, pull bar 5 will be by adjusting nut 2 pulling pendulum pin 4, " tiptoe " 4.3 of pendulum pin 4 withstood on the end face 8.1 of mandrel 8, mandrel 8 catches up with moving iron core 10, design suitable gearratio, make when moving iron core 10 and static iron core adhesive, mandrel 8 also arrives closing position; If adopt the motion strategy in three steps, then in the phase III, with cam drive relation suitable between mandrel 8 end faces and the pendulum pin 4, made before arriving closing position, cam drive is threaded off, the subsynchronous again and locking with mandrel 8 of moving simultaneously iron core 10, moving iron core 10 locks together with mandrel 8 and is synchronized with the movement, and puts in place until combined floodgate.

The invention has the beneficial effects as follows by design drive system transmission rule and block sytem, can increase the startup ability of hydromagnetic switch, reduce the exciting curent of permanent magnet mechanism coil, starting current particularly, and branch, closing speed that can better the control switch contact, reduce contact collision and spring, it is easier that control system is realized, reliability is higher.This mechanism uses the blank of permanent magnet mechanism to fill up high-pressure vacuum breaker like this applicable to the high-pressure vacuum breaker of the circuit breaker of different electric pressures, particularly large opening.

Description of drawings

Fig. 1 permanent magnet mechanism A-A cutaway view.

Fig. 2 permanent magnet mechanism vertical view.

Fig. 3 permanent magnet mechanism B-B revolved sectional view.

Fig. 4 mandrel schematic diagram.

Fig. 5 lock collar schematic diagram.

Fig. 6 puts the pin schematic diagram.

Fig. 7 locking bolt schematic diagram.

Fig. 8 adjusting nut schematic diagram.

Subordinate list: self-locking becomes the main parts size of air gap permanent magnet operating mechanism

Part No.	Title	Part No.	Title	Part No.	Title
Part No.	Title	Part No.	Title	Part No.	Title	1	Buffer	11	Guard shield	21	Back-moving spring
2	Adjusting nut	12	Skeleton	22	Adjustable ring	1	Buffer	11	Guard shield	21	Back-moving spring
2	Adjusting nut	12	Skeleton	22	Adjustable ring	3	Bearing	13	Coil	23	Support spring
4	The pendulum pin	14	The epoxy resin ring	24	Lock pin	3	Bearing	13	Coil	23	Support spring
4	The pendulum pin	14	The epoxy resin ring	24	Lock pin	5	Pull bar	15	Outer static iron core	25	Retaining spring
6	Tripping spring	16	Magnetic isolation plate	26	Afterburning plug	5	Pull bar	15	Outer static iron core	25	Retaining spring
6	Tripping spring	16	Magnetic isolation plate	26	Afterburning plug	7	Cable	17	Interior static iron core	27	Locking bolt
8	Mandrel	18	Guide vane end stop	28	Air gap	7	Cable	17	Interior static iron core	27	Locking bolt
8	Mandrel	18	Guide vane end stop	28	Air gap	9	Lock collar	19	End cap	29，30	Bolt
10	Moving iron core	20	Permanent magnet	31，32	Bearing pin	9	Lock collar	19	End cap	29，30	Bolt

Embodiment

The invention provides a kind of Monostable self-locking type air gas variable permanent magnet operation device that is applicable to large opening, high-tension circuit-breaker, mainly form by four big systems such as magnetic circuit system, drive system, block sytem and support systems.

In Fig. 1, Fig. 2, Monostable self-locking type air gas variable permanent magnet operation device shown in Figure 3, magnetic circuit system mainly is made up of moving iron core 10, outer static iron core 15, interior static iron core 17 and permanent magnet 20 axisymmetricly.Permanent magnet 20 is inlaid between Inner static iron core 17 and the outer static iron core 15; Solenoid 13 is flush-mounted in the coil groove that constitutes between Inner static iron core 17, outer static iron core 15 and the moving iron core 10, and it is fixing by epoxy resin ring 14 and Inner static iron core 17, outer static iron core 15, guard shield 11 is outside on static iron core 15, moving iron core 10 excircles, upper end and outer static iron core 15 relative fixed, leave air gap 28 between Inner static iron core 17, outer static iron core 15 and the moving iron core 10, moving iron core 10 is upper and lower mobile in guard shield 11 under the power effect of solenoid 13 magnetic fields generation, and air gap 28 is changed.Dynamic and static iron core is made by the electrical pure iron material of high magnetic conductivity, the air gap 28 with between the sound iron core, the path in formation permanent magnet 20 and solenoid 13 magnetic field that produces.The permanent magnet 20 of tile is 8～15, in being inlaid between static iron core 17 and the outer static iron core 15, and the confining force when the mechanism "on" position is provided.Tripping spring 6 is stacked in the centered cylinder chamber of magnetic circuit system, and tripping spring 6, end cap 19 and guide vane end stop 18 backs that mandrel 8 passes in lock collar 9, moving iron core 10, the magnetic circuit system from bottom to up successively are pressed on the guide vane end stop 18 by a nut.

Described power and drive system are put pin 4, pull bar 5, adjusting nut 2 compositions such as grade mainly by power line 7, solenoid 13, tripping spring 6, mandrel 8.Tripping spring 6 is overrided to form in pairs by 40～50 dish springs, when the separating brake position, has certain pretightning force, when will only producing and the reverse magnetic field of permanent magnet field when closing position separates, promptly rely on tripping spring 6 separately with the sound iron core for coil passes to less current.The upper end of mandrel 8 is connected with the moving contact component of switch (not drawing among the figure).Driving members such as pendulum pin 4, pull bar 5 and adjusting nut 2 are two, and symmetry is installed.Moving iron core 10 is linked together by bolt 30 with lock collar 9, and pull bar 5 one ends are enclosed within on first bearing pin 31, and the other end of pull bar 5 is loaded onto adjusting nut 2 after passing the key-way shape through hole 4.1 of putting pin 4, and pendulum pin 4 is installed on the bearing 3 by second bearing pin 32; An end face 2.1 of adjusting nut 2 is fitted with " sole " 4.2 of pendulum pin 4 in motion process, and adjusting nut 2 plays the effect of slide block in " sole " planar slide of pendulum pin 4.Adjusting nut 2 is processed into frustum 2.2 (as shown in Figure 8) with the end that " sole " of pendulum pin 4 contacts, and has reduced contact area, thereby has reduced force of sliding friction.After the formed product, adjusting nut 2 and pull bar 5 can be made into one." tiptoe " 4.3 of pendulum pin 4 constitutes the cam drive pair with the large end face of mandrel 8 8.1, and driving link is pendulum pin 4, and driven member is a mandrel 8.

When needs close a floodgate, pass to the direct current of correct direction for solenoid 13 after, solenoid 13 generates an electromagnetic field, the magnetic field with permanent magnet produces produces the suction-combining forces to moving iron core 10.

In the phase I of motion, because the end face 2.1 (as shown in Figure 8) of adjusting nut 2 and pendulum pin 4 " sole " 4.2 have a segment distance, therefore moving iron core 10 will have one section idle stroke, the length of idle stroke is L0, in this stage, " tiptoe " 4.3 (as shown in Figure 6) of pendulum pin 4 do not contact with mandrel 8 as yet, and mandrel 8 is not action as yet.When moving iron core 10 continues to rise, will be by adjusting nut 2 pulling pendulum pin 4, this moment, pull bar 5 rotated around first bearing pin 31, pendulum pin 4 rotates around second bearing pin 32, " tiptoe " 4.3 of pendulum pin 4 withstands on the end face 8.1 of mandrel 8, the counter-force that mandrel 8 is overcome from tripping spring 6 parts such as grade moves upward, thereby enters the motion of second stage.Design suitable gearratio, when moving iron core 10 and static iron core adhesive, mandrel 8 also arrives closing position.So far finish the total kilometres L1 of making process.And, can design cam drive relation suitable between mandrel 8 end faces and the pendulum pin 4, made before arriving closing position, cam drive is threaded off, the subsynchronous again and locking with mandrel 8 of moving simultaneously iron core 10.So just enter the phase III, moving iron core 10 locks together with mandrel 8 and is synchronized with the movement.Following table is in the making process of two kinds of motion modes of new mechanism and traditional permanent magnet mechanism, the speed contrast that moving iron core 10 and mandrel are 8.

During separating brake, pass to reverse electric current, realizing separating brake under the effect of tripping spring 6 and under the cooperation of block sytem to coil.Position when drive system only returns to separating brake after separating brake is finished does not need transmission agency in the separating brake process.

Block sytem is mainly by lock collar 9, locking bolt 27, and afterburning plug 26, lock pin 24, adjustable ring 22, retaining spring 25, back-moving spring 21, support spring 23 is formed.Lock collar 9 is linked together by bolt and moving iron core 10, and mandrel 8 passes lock collar 9.Along lock collar 9 radially, symmetry has two holes.The inner segment in each hole is square 9.1, is used to install square toes locking bolt 27, and outer section be internal thread hole 9.2 (as shown in Figure 5), is used to screw afterburningly fill in 26.Locking bolt 27 1 ends are square 27.1, cooperate with square section 9.1 of lock collar 9 radial holes, and the other end is smooth cylindrical 27.2, and retaining spring 25 is play the guiding role.Smooth cylindrical 27.2, one ends that retaining spring 25 is enclosed within locking bolt 27 withstand on square, the circle segments boundary step 27.3 of locking bolt 27, and an end withstands on the endoporus bottom surface of afterburning plug 26.Square section of locking bolt 27 is wedge shape, and the inclined-plane is working face 27.4 (as shown in Figure 7), during operating state with the wedge-shaped slot 8.2 of mandrel 8 in inclined-plane 8.3 cooperate slip (as shown in Figure 4).When mechanism is in gate-dividing state, in the groove of locking bolt 27 wedging mandrels 8, can screw afterburning plug 26 simultaneously, push down locking bolt 27 by retaining spring 25, make its tightly wedge advance in the wedge-shaped slot of mandrel 8.Because the counter-force effect of tripping spring 6 mandrel 8 can not moved to the combined floodgate direction, and locking bolt 27 makes mandrel 8 and moving iron core 10 that relative motion not take place, and prevents false switching.Lock pin 24 two ends are polished rod, and interlude is a thread segment, and adjustable ring 22 is housed.Lock pin 24 passes moving iron core 10, installs perpendicular to iron core adhesive face, and an end embeds in the pin-and-hole of static iron core, and the other end embeds in the pin-and-hole 9.3 of lock collar 9.Lock pin 24 can be free to slide in the aperture of moving iron core 10 together with adjustable ring 22.End near static iron core is equipped with back-moving spring 21, near an end that moves iron core 10 support spring 23 is housed.Except selecting suitable back-moving spring 21 and support spring 23 for use, also can guarantee correctly to realize safely the function of lock pin 24 by screwing adjustable ring 22.After the formed product, lock pin 24 and adjustable ring 22 can be fixed or make one.

When gate-dividing state, by support spring 23, make lock pin 24 be suspended in slightly locking bolt 27 lockholes 27.5 directly over, lock pin 24 is not fallen in the pin-and-hole 27.5 of 27 square sections of locking bolts.When closing a floodgate, because moving iron core 10 is not subjected to bigger separating brake power effect, to the static iron core adhesive, locking bolt 27 is pulled away from the wedge-shaped slot of mandrel 8 prior to mandrel 8, the end face of locking bolt 27 will withstand on the side plane 8.4 of mandrel 8.Because the outer of locking bolt 27 moves back, pin-and-hole on the locking bolt 27 departs from the position of lock pin 24, an end face of lock pin 24 will be subjected to the compression of back-moving spring 21 simultaneously, withstand on the dovetail groove plane 27.6 of locking bolt 27, and the other end of lock pin 24 is along with the rising of moving iron core 10, inwardly dodge in the pin-and-hole of static iron core 17, up to combined floodgate put in place (or moving iron core 10 is subsynchronous again with mandrel 8).Because mandrel 8 has been finished to moving catching up with of iron core 10, so mandrel 8 returns to sync bit once more with moving iron core 10 when combined floodgate puts (or moving iron core 10 is subsynchronous again with mandrel 8) in place by drive system.At this moment, because locking bolt 27 is subjected to the effect of retaining spring 25, be pressed into once more in the wedge-shaped slot of mandrel 8, so retaining spring 25 has also played the reset response to locking bolt 27 here.After locking bolt 27 resetted, lock pin 24 was aimed at the pin-and-hole on the locking bolt 27 once more, and slipped into the pin-and-hole of locking bolt 27 under the effect of back-moving spring 21, thereby had realized the locking of 8 of moving iron core 10 and mandrels, had prevented the mistake separating brake.When needs once more during separating brake, under the cooperation of each block sytem parts, can successfully realize separating brake, and return to gate-dividing state.

Support system is mainly by bearing 3, Bunper assembly 1, guide vane end stop 18, end cap 19, magnetic isolation plate 16, support and connect composition such as firm.Bearing 3 and magnetic isolation plate 16 respectively by bolt tightening on support (not drawing among the figure).Bearing 3 is used for installing the pendulum pin 4 of drive system, and pendulum pin 4 is installed on the bearing 3 by second bearing pin 32; " tiptoe " 4.3 of pendulum pin 4 constitutes the cam drive pair with the large end face of mandrel 8 8.1, and driving link is pendulum pin 4, and driven member is a mandrel 8; Magnetic isolation plate 16 is fixing by bolt 29 and outer static iron core 15, Inner static iron core 17 is fixed by bolt 29 and end cap 19, magnetic isolation plate 16, guide vane end stop 18 places on the central recessed step cutting pattern of end cap 19, and the stroke of 18 pairs of mandrels 8 of guide vane end stop limits, and mandrel 8 is play the guiding role.Buffer 1 is supported in bearing 3 centre bores, buffer 1 when separating brake to 8 cushioning effects of mandrel.Support system also comprises firm of various connections such as bolt, pin.

Claims

1. A monostable self-locking variable air gap permanent magnet operating mechanism is characterized in that, the permanent magnet operating mechanism comprises:

A magnetic circuit system mainly consists of a moving iron core (10), an outer static iron core (15), an inner static iron core (17) and a permanent magnet (20). The moving iron core (10), the outer static iron core ( 15), the inner static iron core (17) is provided with an air gap (28), thereby forming the passage of the magnetic field produced by the permanent magnet (20) and the electromagnetic coil (13); in the outer static iron core (15), the inner static iron core The permanent magnet (20) between (17) provides the holding force when the mechanism is closed; and under the attraction force produced by the permanent magnet (20) and the electromagnetic coil (13), the moving iron core (10) The mandrel (8) first moves upwards for a certain stroke, so that the air gap (28) is changed, which can reduce the excitation current of the electromagnetic coil (13) and increase the electromagnetic force;

A power and transmission system, mainly composed of power cord (7), electromagnetic coil (13), opening spring (6), mandrel (8), swing foot (4), pull rod (5), and adjustment nut (2) , the swing foot (4), the pull rod (5) and the adjusting nut (2) transmission parts are two pieces, symmetrically installed; the mandrel is coaxial with the moving iron core, and moves relative to the axial direction, and the electromagnetic coil (13) When the closing current is passed, the moving iron core (10) and the mandrel shaft (8) move in three steps, and the moving iron core (10) advances for a certain distance in advance under the condition of basically no reaction force, and then pulls the core through the transmission system. The shaft and the mandrel catch up with the moving iron core until they are synchronized on the eve of closing; in the opening position, the opening spring (6) has a certain pretightening force; when it is necessary to separate from the closing position, the electromagnetic coil (13 ) as long as a smaller current is used to generate a magnetic field opposite to the magnetic field of the permanent magnet (20), the moving iron core (10) is separated from the outer static iron core (15) and the inner static iron core (17);

A locking system mainly consists of a lock plate (9), a lock bolt (27), a booster plug (26), a lock pin (24), an adjusting ring (22), a stop spring (25), a return spring (21), The support spring (23) is composed of; the lock disc (9) is connected together with the moving iron core (10) by bolts, the mandrel (8) passes through the lock disc (9), and the square section at one end of the lock bolt (27) is connected to the lock disc (9) The square section of the radial hole cooperates, and the smooth cylindrical end of the lock bolt (27) acts as a guide to the stop spring (25); when the mechanism is in the opening state, the lock bolt (27) is wedged into the mandrel ( 8), the booster plug (26) can be screwed together at the same time; the pull rod (5) passes through the keyway-shaped through hole of the swing foot (4) to cooperate with the adjustment nut (2), and the adjustment nut (2) is in the swing foot ( 4) The "sole" of the foot acts as a slider; due to the reaction force of the opening spring (6), the mandrel (8) will not move towards the closing direction, and the lock bolt (27) will not move in the direction of the stop spring (25). ) under the preloading action, so that the core shaft (8) and the moving iron core (10) do not move relative to each other, prevent false closing, and ensure the normal opening, closing and reliability of the permanent magnet mechanism;

A support system is composed of a support (3), a buffer assembly (1), a limit block (18), an end cover (19), a magnetic isolation plate (16), a bracket and a connecting solid piece; the support (3) and the magnetic isolation plate (16) are respectively fastened on the bracket by bolts, and the support (3) is used to install the swing foot (4) in the transmission system; the buffer (1) acts on the mandrel (8) when the brake is opened Buffer function; the limit block (18) limits the stroke of the mandrel (8); the end cover (19) is used to support the limit block (18), and guides the mandrel (8).

2. The monostable self-locking variable air gap permanent magnet operating mechanism according to claim 1, characterized in that, the permanent magnet (20) of the magnetic circuit system is embedded in the static iron core (17) and Between the outer static iron cores (15); the electromagnetic coil (13) is embedded in the coil groove formed between the inner static iron core (17), the outer static iron core (15) and the moving iron core (10), and is composed of The epoxy resin ring (14) is fixed with the inner static iron core (17) and the outer static iron core (15), and the protective cover (11) is on the outer circumference of the outer static iron core (15) and the moving iron core (10), and the protective cover (11) The upper end is relatively fixed to the outer static iron core (15), and there is an air gap (28) between the inner static iron core (17), the outer static iron core (15) and the moving iron core (10), and the moving iron core (10) Under the action of the force generated by the magnetic field of the electromagnetic coil (13), it moves up and down in the shield (11) to change the air gap (28); the outer static iron core (15) passes through the bolt (29) and the magnetic isolation The plate (16) is fixed, the inner static iron core (17) is fixed by the bolt (29), the end cover (19), and the magnetic isolation plate (16), and the limit block (18) is placed on the end cover (19) in the opening state. In the step below the center of the center, the moving iron core (10) and the lock plate (9) are connected together by bolts (30), and one end of the pull rod (5) is sleeved on the first pin shaft (31) on the lock plate (9). On top, the other end of the pull rod (5) passes through the keyway-shaped through hole (4.1) of the swing foot (4) and then installs the adjusting nut (2). After the product is formed, the adjusting nut (2) can be made with the pull rod (5) integrated; the swing foot (4) is installed on the support (3) through the second pin shaft (32); the "toe" (4.3) of the swing foot (4) and the large end surface (8.1) of the mandrel (8) constitute Cam transmission pair, the active part is the swing foot (4), the driven part is the mandrel (8); the opening spring (6) is stacked in the central cylindrical cavity of the magnetic circuit system, and the mandrel (8) is from bottom to top Pass through the lock plate (9), the moving iron core (10), the opening spring (6) in the magnetic circuit system, the end cover (19) and the limit block (18) in turn, and then be pressed against the limit block by a nut (18), the buffer (1) is supported in the center hole of the support (3).

3. According to the described monostable self-locking variable air gap permanent magnet operating mechanism of claim 1 or 2, it is characterized in that the moving and static iron cores are all made of high-permeability electrical pure iron material, and The rest of the metal parts are made of non-magnetic materials.

4. According to claim 1 or 2, the monostable self-locking variable air gap permanent magnet operating mechanism is characterized in that, the magnetic circuit system is axisymmetric, that is, the moving iron core, the inner static iron core, and the outer static Both the iron core and the electromagnetic coil are circular.

5. The monostable self-locking variable air gap permanent magnet operating mechanism according to claim 1 or 2, characterized in that the permanent magnets (20) are multi-piece, and are grouped and embedded in the outer static iron core (15) , Between the static iron core (17).

6. The monostable self-locking variable air gap permanent magnet operating mechanism according to claim 1, characterized in that the opening spring (6) is composed of multiple disc springs overlapping in pairs.

7. According to claim 1 or 2, the monostable self-locking variable air gap permanent magnet operating mechanism is characterized in that, the three-step movement of the moving iron core (10) and the mandrel (8) In the first stage, since there is a certain distance between the end surface (2.1) of the adjusting nut (2) and the "sole" (4.2) of the swing foot (4), the moving iron core (10) will have a certain idle stroke, and the swing foot ( 4) The "toe" (4.3) has not been in contact with the mandrel (8), and the mandrel (8) has not yet moved; in the second stage of motion, when the moving iron core (10) continues to rise, the pull rod (5) will Pull the swing foot (4) through the adjustment nut (2), so that the "toe" (4.3) of the swing foot (4) is pushed against the end face (8.1) of the mandrel (8), and the mandrel (8) catches up with the moving iron core ( 10), design an appropriate transmission ratio, so that when the moving iron core (10) is attracted to the static iron core, the mandrel (8) also reaches the closing position; in the third stage of movement, the end face of the mandrel (8) The proper cam transmission relationship with the swing foot (4) makes the cam transmission trip before reaching the closing position, and at the same time, the moving iron core (10) and the mandrel (8) are synchronized and locked again, and the moving iron core ( 10) Lock together with the mandrel (8) and move synchronously until the switch is in place.