CN106531493A - Mechanical self-locking hanging piece used with AC contactor in matching way and working method of mechanical self-locking hanging piece - Google Patents

Abstract

The invention provides a mechanical self-locking hanging piece used with an AC contactor in a matching way and a working method of the mechanical self-locking hanging piece, and relates to an energy-saving technology of the AC contactor and a method of the AC contactor. The mechanical self-locking hanging piece comprises an auxiliary contact group, a sliding rail, a crochet hook and a press spring, wherein the auxiliary contact group is provided with a left cover plate and a right cover plate, movable contact seats are arranged in the left cover plate and the right cover plate, a movable contact group and a reset button are arranged on each movable contact seat, a front static contact seat and a rear static contact seat are arranged in front of and behind the movable contact seat and are used for matching with the movable contact seat, static contact groups are arranged on both of the front static contact seat and the rear static contact seat, the on/off states of the static contact group and the movable contact group are controlled by the AC contactor, the sliding rail is arranged on the movable contact seat and is formed by a closed ring groove in a heart shape from bottom to top, the crochet hook is arranged between the sliding rail and the left/right cover plate, and self-locking or unlocking is achieved by matching of the crochet hook and the sliding rail in a sliding way. The mechanical self-locking hanging piece is simple in structure and low in cost and is easy to use, the AC contactor is not needed to transform, energy saving is achieved by completely dependent on mechanical self-locking, and the mechanical self-locking hanging piece can synchronously and coordinately act with the AC contactor.

Description

With the mechanical self-locking suspension member and its method of work of A.C. contactor adapted

Technical field

The present invention relates to the power-saving technology and its method of A.C. contactor, more particularly, to a kind of and A.C. contactor adapted Mechanical self-locking suspension member and its method of work.

Background technology

A.C. contactor is one of most frequently used low-voltage electrical apparatus, is mainly used in the electric wiring reality to relatively large load Now closure and disjunction is controlled.The power of every A.C. contactor autophage is about 30～500W, and usage amount surpasses at present for China 700,000,000 (year increases about 100,000,000) are crossed, the whole world there are about 45～5,000,000,000, consume billions of degree electricity daily.It can be seen that, A.C. contactor It is electricity consumption " "big tiger" ".For this purpose, people are studied for a long period of time.

" mechanical self-latching type ac contact means " of China Patent Publication No. CN1107963C, it adopt mechanical self-locking and Electromagnetism unlocking manner, locks the contacts status of A.C. contactor using more complicated mechanical mechanism, to reach energy-conservation purpose；Which lacks Point is that structure is relative complex, including using major and minor two groups of electromagnet, electromagnetism release circuit and mechanical mechanism, and cost Height, has not yet been viewed the patented product popularization and application commercially at present.

China Patent Publication No. CN2388703 " saving device for alternating current contactor ", it is locking friendship using DC circuit magnetic loop The contact closure condition of stream contactor, reaches energy-conservation purpose；Which has the disadvantage that DC circuit magnetic loop can produce remanent magnetism, may go out when power is off Existing its moving armature and static gag bit cannot be separated, and reduce the reliability of A.C. contactor switching, or even cannot normal work.

China Patent No. ZL200820302979.8 " saving device for alternating current contactor ", it passes through AC contactor touch head machine Structure moves produced mechanical energy to realize the locking of its contact closure condition；During disconnection, it is produced using another group of electromagnet Electromagnetic energy promote mechanical release mechanism recovering the original state of A.C. contactor, which has the disadvantage that structure is relative complex, disconnects Action is delayed, and mechanical mechanism is easily stuck, poor reliability.

China Patent No. ZL 201620369956.3 " mechanical self-locking contactor ", it overcomes to a certain extent The shortcoming of foregoing invention, but transformation A.C. contactor is needed also exist for, and the self-locking device of A.C. contactor side is installed on, logical Electric moment is likely to occur dynamic unbalance, and affects the switching of self-locking and unblock.

In a word, at present on the power-economizing method and its device of A.C. contactor, it is required for changing the structure of A.C. contactor, Not only result in the increase of production process and production cost, and the reliability of A.C. contactor can be affected to varying degrees, This is to restrict the main cause that A.C. contactor does not also have ripe energy-conserving product to put on market.

The content of the invention

It is an object of the invention to provide one kind directly outer can be suspended on A.C. contactor, it is to avoid because transforming A.C. contactor institute The series of problems for bringing, it is possible to resolve the energy-efficient contradiction and reliably working between of A.C. contactor with A.C. contactor adapted Mechanical self-locking suspension member and its method of work.

For achieving the above object, the present invention is adopted the following technical scheme that：

A kind of mechanical self-locking suspension member with A.C. contactor adapted, including auxiliary contact group, dragging track, crochet hook and pressure Tight spring；

The auxiliary contact group is provided with left cover and right cover plate, is disposed with movable contact seat in left cover and right cover plate, moves Movable contact group and SR are provided with contact shoe, before being provided with for being engaged with movable contact group before and after movable contact seat Breakback contact stand and rear breakback contact stand；The front breakback contact stand and rear breakback contact stand are equipped with stationary contact, stationary contact group and movable contact The on off operating mode of group is controlled by A.C. contactor；At least side of the movable contact seat is provided with dragging track, dragging track with Crochet hook is set between left cover or right cover plate, and the crochet hook is slidably matched with dragging track, for realize between contact sets from Lock and unblock；The crochet hook is slided by which in the contact adhesive for following A.C. contactor moving contact group upwards motion process Row orbital position makes A.C. contactor electromagnet still protect when power is off realizing the self-locking between movable contact group and stationary contact group The working condition (abbreviation self-locking) of its contact sets is held, the crochet hook departs from the movable contact group for following A.C. contactor and transports downwards During dynamic, realize from the switching for being locked into certainly unblock again by the diverse location of its dragging track, make the dynamic of A.C. contactor Original state (referred to as resetting) is returned between contact sets and stationary contact group.

Further：

Preferably, the dragging track by bottom to top is inShape closed annular groove is formed, describedShape closed annular Groove is made up of corresponding step and gradient section, describedThe minimum point (bottom) of shape closed annular groove be defined as initial point step and Unblock point step (abbreviation initial point and unblock point, similarly hereinafter), the dragging track is inMinimum point (recess) definition at the top of shape It is for latching point step (abbreviation latching point, similarly hereinafter), describedPeak of the shape closed annular groove between unblock point and latching point Right relay point step and left relay point step (the right relay point of abbreviation and left relay point, similarly hereinafter) are respectively defined as, on initial point, the right side Self-locking starting gradient section, self-locking are respectively equipped between adjacent 2 points of relay point, latching point and left relay point and complete gradient section, solution The initial gradient section of lock and unblock complete gradient section, describedShape closed annular groove is used to protect using corresponding step and pits rampway structure Card crochet hook can only be moved along single (clockwise or counterclockwise) direction when the movable contact group action of A.C. contactor is followed, with Avoid producing misoperation in self-locking or unblock.

Preferably, contact pressure spring is provided between the movable contact group and stationary contact group in the auxiliary contact group, institute State crochet hook from initial point move to right relay point (or left relay point) when, the suction-combining force of A.C. contactor will be made in auxiliary contact group Contact pressure spring there is positive deformation, promote crochet hook continue to move to latching point from right relay point (or left relay point) it is real Existing self-locking；The crochet hook from latching point move to left relay point (or right relay point) when, the spring restoring force of A.C. contactor will Make the contact pressure spring in auxiliary contact group that reverse deformation to occur, promote crochet hook to continue from left relay point (or right relay point) to transport Move to initial point realize unlock and reset.The deformation of contact pressure spring and variable, can be according to the inhomogeneity of A.C. contactor Type is adjusted in right amount, synchronous to guarantee the action between mechanical self-locking suspension member and A.C. contactor.

Preferably, the holddown spring for avoiding crochet hook from coming off from dragging track is provided between the crochet hook and casing.

Preferably, the crochet hook is typically in being easy to fixed zigzag or π fonts, it is also possible to using can follow movable contact The other shapes of group motion.

Preferably, the left cover is worn fixed using fastening screw with right cover plate and is scheduled on front breakback contact stand and rear breakback contact stand On.

Preferably, the movable contact seat is provided with SR, when exterior power supply plant failure and A.C. contactor and machine When tool formula self-locking suspension member is still all in self-locking state, A.C. contactor and mechanical self-locking suspension member are made by pressing SR On all contact sets states carry out manual reset.

Preferably, the frame mode of the mechanical self-locking suspension member, directly outer can be suspended to A.C. contactor for installing On the rank frame of auxiliary contact group, (top) and can retain auxiliary contact group of A.C. contactor and application thereof realizing energy-conservation.

Preferably, the auxiliary contact group can directly using the auxiliary contact group of A.C. contactor, it is also possible to is designed as solely The outer suspension member of A.C. contactor is stood on, while also not limiting to the energy-conservation for being applied to A.C. contactor.

A kind of method of work of the mechanical self-locking suspension member with A.C. contactor adapted, using a kind of above-mentioned and ac contactor The mechanical self-locking suspension member of device adapted, the method for work are comprised the steps of：

(1) crochet hook is located at the initial point of dragging track, is switched on power moment, the electromagnetism Tie Tong in A.C. contactor Electricity produces electromagnetic force, and the electromagnetic force overcomes the reaction force adhesive armature of back-moving spring, and the armature is moved downward, so as to band Move the movable contact seat to move downward with respect to crochet hook, while the crochet hook is moved up in the right side along dragging track from initial point After point or left relay point, now corresponding movable contact group is contacted or is separated with stationary contact group, i.e. moving together contact group closure, dynamic Contact sets disconnection is opened, into the preparatory stage of self-locking；

(2), during deenergization, the electromagnet power-off in the A.C. contactor loses electromagnetic force, and the armature is in reset bullet Moved under the restoring force effect of spring upwards, drive the movable contact seat to be moved with respect to crochet hook upwards, while the crochet hook edge Dragging track latching point is moved downwardly to from right relay point or left relay point, now corresponding movable contact group and stationary contact group The state of step (1) is kept, self-locking is completed.Now, the electromagnet of A.C. contactor is powered without the need for power supply, fully relies on crochet hook and exists The step locking of latching point, makes all contact sets on A.C. contactor and mechanical self-locking suspension member keep its working condition；

(3) power supply moment is again switched on, the electromagnet in A.C. contactor is powered and produces electromagnetic force, and the electromagnetic force overcomes The reaction force of back-moving spring adhesive armature again, the armature are moved downward, so as to drive the relative crochet hook of movable contact seat downward Motion, while the crochet hook moves up to left relay point or right relay point from latching point along dragging track, it is now corresponding Movable contact group and stationary contact group keep the state of step (1), into the preparatory stage of unblock；

(4), when being again off power supply, the electromagnet power-off in the A.C. contactor loses electromagnetic force, and the armature is multiple Position spring active force under move upwards, so as to drive movable contact seat to be moved relative to crochet hook upwards, at the same the crochet hook along Dragging track moves downwardly to unblock point from left relay point or right relay point, now movable contact group with stationary contact group by the thixotroping that connects To be separated or being changed into contacting from phase separation, i.e., by closed reduction to disconnect, dynamic to open contact sets multiple by disconnecting for moving together contact group Position is closure, completes unblock, makes all contact sets on A.C. contactor and mechanical self-locking suspension member all reset；

(5) when exterior power supply plant failure, and A.C. contactor and mechanical self-locking suspension member are still all in self-locking state When, by pressing the SR on mechanical plug-in latch fitting, to all tactile on A.C. contactor and mechanical self-locking suspension member Point group carries out manual reset.

Compared with prior art, the invention has the advantages that：

(1) present invention is by dragging track and mechanical self-latching principle, makes its crochet hook can only using the gradient and step of slideway Along unidirectional motion, and by corresponding step (point) locking and release the working condition of A.C. contactor, with effective Misoperation or action failure are prevented, reliability is high.

(2), into the self-locking stage, the electromagnet of A.C. contactor is without the need for consuming energy still for mechanical self-locking suspension member of the invention The working condition of all contact sets is kept so, relative to conventional AC contactor up to 95% in energy-conservation, obvious energy conservation.

(3) simple structure of the invention, no matter in production technology and production cost, or in use occasion and convenience side Face, all with unique advantage, plug and play takes effect.

(4) present invention is effectively reduced outside heating, noise and the electromagnetic radiation of A.C. contactor, may be used also except energy-efficient Extend the service life of A.C. contactor.

(5) present invention is not required to transform A.C. contactor, and can retain the using method and its characteristic of A.C. contactor, installs Using very convenient.

Description of the drawings

Fig. 1 is embodiment of the present invention structural representation.

Exploded perspective views of the Fig. 2 for Fig. 1.

First profiles of the Fig. 3 for Fig. 1.

Second profiles of the Fig. 4 for Fig. 1.

Fig. 5 is the dragging track structural representation in Fig. 3.

Fig. 6 is the scheme of installation of the embodiment of the present invention and A.C. contactor.

In Fig. 1～6, each mark is represented respectively：The mechanical self-locking suspension members of A-, B- A.C. contactors, 1- left covers, 2- pressures Tight spring, 3- crochet hooks, 4- upper cover plates, 5- dragging tracks, 51- initial points (are unlocked a little), and 52- self-lockings complete gradient section, and 53- is right Relay point, 54- self-lockings starting gradient section, 55- latching points, the initial gradient section of 56- unblocks, the left relay points of 57-, 58- unblocks are completed Gradient section, 59- unblocks point (i.e. initial point), 6- stationary contact groups, 7- movable contact seats, 8- right cover plates, 9- fastening screws are quiet after 10- Contact shoe, breakback contact stand before 11-, 12- contact pressure springs, 13- movable contact groups, 14- SRs.

Specific embodiment

Below in conjunction with the accompanying drawings and embodiment is described in further detail to the present invention.

Referring to Fig. 1～6, a kind of mechanical self-locking suspension member A with A.C. contactor adapted, including auxiliary contact group (stationary contact Point group 6 and movable contact group 13), dragging track 5, crochet hook 3 and holddown spring 2；The auxiliary contact group is provided with left cover 1 and the right side Movable contact seat 7 is disposed with cover plate 8, the left cover 1 and right cover plate 8,13 He of movable contact group on the movable contact seat 7, is provided with SR 14, the movable contact seat 7 before and after be provided with the front breakback contact stand 11 for being engaged with movable contact group 13 and after Breakback contact stand 10, the front breakback contact stand 11 and rear breakback contact stand 10 are equipped with stationary contact group 6, and the stationary contact group 6 is touched with dynamic The on off operating mode of point group 13 is controlled by A.C. contactor B.In the auxiliary contact group, at least side of the movable contact seat 7 Dragging track 5 is provided with, the dragging track 5 by bottom to top is inShape closed annular groove (see Fig. 5) is formed, describedShape Closed annular groove by initial point 51 or unblock point 59, self-locking starting gradient section 52, right relay point 53, self-locking complete gradient section 54, Latching point 55, the initial gradient section 56 of unblock, left relay point 57 and unblock complete gradient section 58 and constitute, describedShape closed annular groove Being set to different steps and gradient section is used to ensure that crochet hook can only be moved along single (clockwise or counterclockwise) direction, described to slide Crochet hook 3 is provided between track 5 and left cover 1 or right cover plate 8, one end of the crochet hook 3 is connected with left cover 1 or right cover plate 8 Fixation is picked up, the other end and the dragging track 5 of the crochet hook 3 are slidably matched and play self-locking and unblock effect, the hook Pin 3 follow 13 adhesive of movable contact group of auxiliary contact group and upwards in motion process through dragging track 5 unblock point 51, right Relay point 53 (or left relay point 57), latching point 55 connect exchange completing the self-locking between movable contact group 13 and stationary contact group 6 The electromagnet of tentaculum remains in that the working condition (abbreviation self-locking) of all contact sets when power is off；Crochet hook 3 is following auxiliary tactile The movable contact group of head group departs from and during moving downward, latching point 55 through dragging track 5, left relay point 57 are (or in the right side After point 53), finally return to unblock point 51, complete from the switching for being locked into certainly unblock, make the movable contact group 13 of A.C. contactor with it is quiet Original state (referred to as resetting) is returned between contact sets 6.

In the present embodiment, contact pressure spring 12, the hook are provided between the movable contact group 13 and stationary contact group 6 Pin 3 from initial point 51 move to right relay point 53 (or left relay point 57) when, the contact pressure spring in auxiliary contact group will be made 12 there are positive deformation, promote crochet hook 3 to continue to move to latching point 55 from right relay point 53 (or left relay point 57) and complete self-locking； The crochet hook 3 from latching point 55 move to left relay point 57 (or right relay point 53) when, the contact pressure spring on contact will be made 12 occur reverse deformations, promote crochet hook 3 continue from left relay point 57 (or right relay point 53) move to initial point 51 complete unblock And reset.The deformation of contact pressure spring 12 and variable, can be adjusted in right amount according to the different type of A.C. contactor B, with Ensure that mechanical self-locking suspension member A is synchronous with the action between A.C. contactor B.

The holddown spring 2 for avoiding crochet hook 3 from coming off from dragging track 5 is provided between the crochet hook 3 and left cover 1, The crochet hook 3 is general in being easy to fixed zigzag or π fonts, it is also possible to using can follow that movable contact group 13 moves other Shape.

The left cover 1 is fixed on front breakback contact stand 11 and rear breakback contact stand 10 with fastening screw 9 with right cover plate 8.

On the movable contact seat, 7 are provided with SR 14, when exterior power supply plant failure and A.C. contactor B and machinery When formula self-locking suspension member A is still all in self-locking working condition, by pressing SR 14, make on A.C. contactor B and suspension member A All contact sets carry out manual reset.

During installation, the mechanical self-locking suspension member A adopts plug-in mode, is directly inserted into A.C. contactor B for installing auxiliary Help on the rank frame of contact sets (see Fig. 6) to realize energy-conservation, and it is (described to retain the auxiliary contact group of A.C. contactor B and application thereof Mechanical self-locking suspension member A is not limited to the auxiliary contact group using A.C. contactor B, does not also limit to and is applied to A.C. contactor Energy-conservation).

It is described as follows with the method for work of the mechanical self-locking suspension member A of A.C. contactor adapted：

(1) it is located at the initial point 51 of dragging track 5 in the crochet hook 3, connects (odd number) power supply moment, ac contactor Electromagnet (containing electromagnet) in device B is powered and produces electromagnetic force, and electromagnetic force overcomes the reaction force adhesive armature of back-moving spring, holds in the mouth Iron is moved downward, so as to drive 7 relative crochet hook 3 of the movable contact seat to move downward, while the crochet hook 3 is along dragging track 5 Right relay point 53 or left relay point 57 are moved up to from initial point 51, now corresponding movable contact group 13 and 6 phase of stationary contact group Contact is separated, i.e. moving together contact closure, dynamic to open contact disconnection, into the preparatory stage of self-locking.

(2) during deenergization, the electromagnet power-off in the A.C. contactor B loses electromagnetic force, and the armature is resetting Moved under the restoring force effect of spring upwards, drive 7 relative crochet hook 3 of the movable contact seat to move upwards, while 3 edge of the crochet hook Dragging track 5 latching point 55 is moved downwardly to from right relay point 53 or left relay point 57, now corresponding movable contact group 13 The state of step (1) is kept with stationary contact group 6, self-locking is completed.Now, the electromagnet of A.C. contactor B is powered without the need for power supply, complete The full step by crochet hook 3 in latching point 55 is locked, and makes all contact sets on A.C. contactor B and mechanical self-locking suspension member A Keep its working condition.

(3) (even number) power supply moment is again switched on, the electromagnet in A.C. contactor B is powered and produces electromagnetic force, electromagnetism Power overcomes the reaction force of back-moving spring adhesive armature again, and the armature is moved downward, so as to drive 7 phase of movable contact seat Crochet hook 3 is moved downward, while the crochet hook 3 moves up to left relay point 57 or the right side from latching point 55 along dragging track 5 Relay point 53, now corresponding movable contact group 13 and stationary contact group 6 keep the state of step (1), into the preparation rank of unblock Section.

(4) when being again off power supply, the electromagnet power-off in the A.C. contactor B loses electromagnetic force, and the armature exists Moved under the active force of back-moving spring upwards, so as to drive 7 relative crochet hook 3 of the movable contact seat to move upwards, while the hook Pin 3 moves downwardly to unblock point 51 from left relay point 57 or right relay point 53 along dragging track 5, now the movable contact group 13 It is changed into being separated from contacting with stationary contact group 6 or is changed into contacting from phase separation, i.e., moving together contact group is disconnected by closed reduction Open, dynamic contact sets of opening are reset to closure by disconnection, complete unblock, make all on A.C. contactor B and mechanical self-locking suspension member A Contact sets all reset.

(5) when exterior power supply plant failure and A.C. contactor B and mechanical self-locking suspension member A are still all in self-locking state When, by pressing the SR 14 on mechanical plug-in latch fitting A, to the institute on A.C. contactor B and mechanical self-locking suspension member A There are contact sets to carry out manual reset.

In embodiments of the present invention (see Fig. 6), mechanical self-locking suspension member A is energized to power-off time, can by button or and Electric impulse signal is controlled, and control (being persistently powered) time is not more than 300ms.

Claims (9)

1. with the mechanical self-locking suspension member of A.C. contactor adapted, it is characterised in that：Including auxiliary contact group, dragging track, hook Pin and holddown spring；

The auxiliary contact group is provided with left cover and right cover plate, is disposed with movable contact seat, movable contact in left cover and right cover plate Movable contact group and SR are provided with seat, the front stationary contact for being engaged with movable contact group before and after movable contact seat, is provided with Point seat and rear breakback contact stand；The front breakback contact stand and rear breakback contact stand are equipped with stationary contact, stationary contact group and movable contact group On off operating mode is controlled by A.C. contactor；At least side of the movable contact seat is provided with dragging track, dragging track and left cover Crochet hook is set between plate or right cover plate, and the crochet hook is slidably matched with dragging track, for realize the self-locking between contact sets and Unblock.

2. mechanical self-locking suspension member according to claim 1 with A.C. contactor adapted, it is characterised in that：It is described to slide rail Road by bottom to top is inShape closed annular groove is formed, describedShape closed annular groove is by corresponding step and gradient section structure Into describedThe minimum point (bottom) of shape closed annular groove is initial point step and unblock point step, describedShape closed annular Minimum point at the top of groove is latching point step, describedPeak difference of the shape closed annular groove between unblock point and latching point For right relay point step and left relay point step, between adjacent 2 points of initial point, right relay point, latching point and left relay point It is respectively equipped with self-locking starting gradient section, self-locking and completes gradient section, the initial gradient section of unblock and unblock and completes gradient section, it is describedShape The step and pits rampway structure of closed annular groove makes crochet hook when the movable contact group action of A.C. contactor is followed, can only be along clockwise Or counterclockwise move, crochet hook coordinates slip to realize self-locking or unblock with dragging track.

3. mechanical self-locking suspension member according to claim 1 with A.C. contactor adapted, it is characterised in that：The auxiliary is touched Contact pressure spring is provided between movable contact group and stationary contact group in point group.

4. mechanical self-locking suspension member according to claim 1 with A.C. contactor adapted, it is characterised in that：The crochet hook with The holddown spring for avoiding crochet hook from coming off from dragging track is provided between casing.

5. mechanical self-locking suspension member according to claim 1 with A.C. contactor adapted, it is characterised in that：The crochet hook is in Zigzag or π fonts.

6. mechanical self-locking suspension member according to claim 1 with A.C. contactor adapted, it is characterised in that：The left cover Fixed is worn using fastening screw with right cover plate to be scheduled on front breakback contact stand and rear breakback contact stand.

7. mechanical self-locking suspension member according to claim 1 with A.C. contactor adapted, it is characterised in that：The movable contact Seat is provided with the SR for manual reset.

8. mechanical self-locking suspension member according to claim 1 with A.C. contactor adapted, it is characterised in that：The auxiliary is touched Head group is directly using the auxiliary contact group or the auxiliary contact group of other independent plug-in setting of A.C. contactor.

9. a kind of method of work of the mechanical self-locking suspension member of and A.C. contactor adapted, it is characterised in that：Will using such as right 1～8 any one described mechanical self-locking suspension member with A.C. contactor adapted, the method for work is asked to comprise the steps of：

(1) crochet hook is located at the initial point of dragging track, is switched on power moment, and the electromagnet in A.C. contactor is powered and produces Raw electromagnetic force, the electromagnetic force overcome the reaction force adhesive armature of back-moving spring, and the armature is moved downward, so as to drive State movable contact seat to move downward with respect to crochet hook, while the crochet hook moves up to right relay point from initial point along dragging track Or left relay point, now corresponding movable contact group contact or be separated with stationary contact group, i.e. moving together contact group closure is dynamic to open tactile Point group disconnects, into the preparatory stage of self-locking；

(2), during deenergization, the electromagnet power-off in the A.C. contactor loses electromagnetic force, and the armature is in back-moving spring Moved under restoring force effect upwards, drive the movable contact seat to be moved with respect to crochet hook upwards, while the crochet hook is along cunning Row track moves downwardly to latching point from right relay point or left relay point, and now corresponding movable contact group is kept with stationary contact group The state of step (1), completes self-locking, and now, the electromagnet of A.C. contactor is powered without the need for power supply, fully relies on crochet hook in self-locking The step locking of point, makes all contact sets on A.C. contactor and mechanical self-locking suspension member keep its working condition；

(3) power supply moment is again switched on, the electromagnet in A.C. contactor is powered and produces electromagnetic force, and the electromagnetic force overcomes reset The reaction force of spring adhesive armature again, the armature are moved downward, so as to drive the relative crochet hook of movable contact seat to move downward, The crochet hook moves up to left relay point or right relay point from latching point along dragging track simultaneously, and now corresponding is dynamic tactile Point group keeps the state of step (1) with stationary contact group, into the preparatory stage of unblock；

(4), when being again off power supply, the electromagnet power-off in the A.C. contactor loses electromagnetic force, and the armature is in reset bullet Moved under the active force of spring upwards, so as to drive the relative crochet hook of movable contact seat to move upwards, while the crochet hook is along sliding rail Road moves downwardly to unblock point from left relay point or right relay point, and now movable contact group is changed into phase point with stationary contact group from contacting From or be changed into contacting from phase separation, i.e., moving together contact group by closed reduction to disconnect, it is dynamic to open contact sets and be reset to close by disconnection Close, complete unblock, make all contact sets on A.C. contactor and mechanical self-locking suspension member all reset；

(5) when exterior power supply plant failure, and A.C. contactor and mechanical self-locking suspension member still all in self-locking state when, lead to The SR pressed on mechanical plug-in latch fitting is crossed, all contact sets on A.C. contactor and mechanical self-locking suspension member are entered Row manual reset.