CN206947194U - Linear permanent magnet vacuum load ratio bridging switch - Google Patents

Abstract

A kind of linear permanent magnet vacuum load ratio bridging switch, including switching switch and selecting switch two parts composition, the selecting switch includes motion, the discriminating gear being made up of moving contact and multigroup static contact for the motive contact module that stepper motor, screw mandrel, screw pair form；The static contact of the selecting switch is divided into odd number group and even numbers group；The switching switch includes permanent magnet mechanism and handover module, main road connection or the connection of secondary road are changed come quick by the magnet coil being arranged on handover module, two groups of vacuum tubes are provided with handover module, main vacuum tube is wherein provided with main road, pair route main vacuum tube and transition resistance and is composed in series, and discriminating gear and switching mechanism be arranged in parallel.Its automaticity is high, simple in construction, is easily installed maintenance.Its numbers of gear steps is unlimited, and volume is more compact with respect to tub shunting switch.

Description

Linear permanent magnet vacuum load ratio bridging switch

Technical field

A kind of more gear vacuum shunting switch are the utility model is related to, the permanent magnetism loaded tap-off of particularly linear structure is opened Close.

Background technology

Mostly it is to use core structure in load ratio bridging switch used in power supply department, profile is cylinder, and it is by exhausted Edge cylinder, main shaft, mounting bracket, conducting ring, moving contact and static contact composition, insulating cylinder are made up of stack shell and upper and lower cover, are insulated The center of cylinder is provided with main shaft, and the static contact and roller of conducting ring and more gears are provided with insulating cylinder inwall, is fixed on main shaft There is multigroup mounting bracket, mounting bracket is divided into contact support and moving contact rack, contact and conducting ring wherein on contact support All the time contact, active contact and transition moving contact are arranged on moving contact rack, are set between active contact and transition moving contact There is gearshift resistance, a pair of vacuum tubes are installed on contact supporting, connected between contact and active contact by main vacuum tube, contact Connected between transition moving contact transition vacuum tube and gearshift resistance；It is each provided with by the main vacuum tube and by transition vacuum tube One leverage, the fulcrum of leverage are set on support, and the moving conductive rod on the rear end and vacuum tube of lever coordinates；Vacuum The front end of the dynamic lever of pipe is provided with trapezoid block, and the trapezoid block coordinates, the rotating shaft of roller when with main axis with roller It is fixed on the inwall of insulating cylinder or is fixed on conducting ring inwall.

Its static contact is distributed on the inwall of insulating cylinder, and certain length is needed due to static contact, and adjacent Static contact between must keep suitable gap, prevent electric leakage or arc through, therefore the diameter and girth of insulating cylinder inwall Directly determine the maximum gear number that the shunting switch can be set.The more shunting switch of gear number, required insulating cylinder Diameter is bigger, and the volume of switch is also bigger.And corresponding internal moving contact rack and contact support also must accordingly increase, Weight increase.

The content of the invention

Technical problem to be solved in the utility model is：The linear permanent magnet vacuum for providing a kind of brand new has load Shunting switch.It does not use core structure, can reduce equipment volume and weight, reduces manufacture and maintenance cost.

The technical scheme in the invention for solving the above technical problem is：A kind of linear permanent magnet vacuum loaded tap-off is opened Close, be made up of gear selection mechanism and switching mechanism, multiple static contacts and matched are provided with gear selection mechanism Moving contact；Switching mechanism includes switching switch, permanent magnet mechanism, main vacuum tube, transition vacuum tube and transition resistance；Its feature exists In：The gear selection mechanism and switching mechanism be arranged in parallel.

The moving contact group that the gear selection mechanism is moved by two groups of static contact groups arranged in parallel and synchronous linear Composition, one of which static contact is odd number static contact, and its moving contact lead-out wire is odd number lead-out wire, and another group of static contact is even numbers Static contact, its moving contact lead-out wire are even numbers lead-out wire；Odd number static contact and even numbers static contact are respectively connected to cutting for switching mechanism Change on two interfaces of switch；

The static contact of the gear selection mechanism is arranged in stationary contact bracket, and slide rail is provided with stationary contact bracket, single Number moving contacts and even numbers moving contact are separately positioned on the both sides of moving contact rack, at the same with an odd number static contact and an even numbers Static contact is in contact；Moving contact rack is connected with pushing meanss.

The pushing meanss are stepper motor, and stepper motor is connected with the screw mandrel being arranged on below moving contact rack, move and touch Screw pair is provided with head bracket.

The gear selection mechanism is provided with three groups of moving contact racks that are identical, and being synchronized with the movement, three moving contacts It is fixedly connected between support integrally, is connected by a screw pair with the screw mandrel that stepper motor is driven.The structure can fit Answer the same step gear shifting requirement of three-phase electricity.

The static contact of the gear selection mechanism is L-shaped, and two row's static contact contacting points positions are by being arranged on static contact branch The contact extension of top of the trellis, focus on the side of stationary contact bracket.This is designed with beneficial to the continuously distributed of gear contact.

In the switching mechanism, permanent magnet mechanism is arranged on the side of the pedestal of switching mechanism, the moving lever of switching mechanism It is connected with the sliding shoe of switching mechanism, the side of pedestal is provided with vacuum tube buffer, main vacuum tube, secondary vacuum tube and transition electricity Resistance, opposite side are provided with the static contact group of switching switch；The side of the sliding shoe is provided with roller, and opposite side is provided with tap The moving contact of switch；The roller is engaged with the vacuum tube buffer of shunting switch, the top of vacuum tube buffer and roller It is in contact, the bottom of vacuum tube buffer is fixedly connected with the moving conductive rod of vacuum tube.

A leverage is provided with the pedestal of the switching mechanism, one end rotating shaft of leverage is arranged on pedestal On, the moving lever of permanent magnet mechanism and the middle part of lever are hinged, and the other end of lever and the bearing pin being arranged on sliding shoe are rotated and connected Connect.The leverage amplifies the movement travel of the moving lever of permanent magnet mechanism, vacating space.

Roller on the moving lever of the switching mechanism is separately positioned on two horizontal planes, wherein every group of main vacuum tube Buffer and the first roller, the second roller coordinate, and the buffer of transition vacuum tube and the 3rd roller coordinate.

The sliding shoe of the switching mechanism is internally provided with internal trolley, and internal trolley coordinates with the T-shaped slide rail on pedestal.

Limit spacing block, limit spacing block and the pole on moving lever are installed with the top of the pedestal of the switching mechanism Spacing hole is limited to coordinate.

The vacuum tube buffer is made up of lower casing, elastic jacking block and spring, and spring groove, spring installation are provided with lower casing In spring groove, and elastic jacking block is withstood, the upper surface of elastic jacking block is truncated cone-shaped, and the bottom of elastic jacking block is provided with fastening Point, fasten the matching ends of the moving conductive rod of point and vacuum tube.

The moving contact of the gear selection mechanism, by the contact of left and right two and contact spring, the first spring lever and fixation Pin bank is into being provided with spring lever positioning hole and contact mounting groove, the first spring lever sequentially passes through the first left bullet on moving contact rack After spring, the first left movable contact spring, the first right movable contact spring, the first right spring, the both ends of the first spring lever are fixed by steady pin；Institute State rounding on the top surface of the static contact of gear selection mechanism.

The moving contact of the switching switch of the switching mechanism is by contact chip, sliding shoe, conductor rail, the second left movable contact spring, the Two right movable contact springs and a pair of second springs are formed, and contact chip, which is arranged on, to be slided on bar, and sliding shoe is fixed with T-shaped slide rail matches somebody with somebody Close, slide bar and be clamped in contact chip bottom, slide and movable contact spring positioning hole is provided with bar, second spring bar through spring, The movable contact spring positioning hole on bar is slided, by two panels the second movable contact spring flexible fastening；The top surface of the static contact of the switching switch Rounding.

Compared with prior art, the utility model has the advantage of：It uses linear gear structure, is driven by stepper motor Dynamic screw mandrel rotates, and with the screw pair rectilinear movement on gear moving contact, selects different gears.With conventional linear formula selecting switch Difference, it employs two sets of moving contacts of odd number and even numbers and static contact coordinates, and single and double line is simultaneously turned on and accessed in switching mechanism. Switching mechanism includes a set of confirmation odd number connection or the switching of even numbers joint switch, and a set of vacuum tube and transition resistance, very Arc extinguishing when blank pipe is used to switch gear, transition resistance and transition vacuum tube are used in gear handoff procedure, keep loaded electricity Road does not power off.The two works asynchronously, and coordinates and completes.

Gear selection mechanism in the utility model can be used as no-load tapping switch to work independently, and it uses linear knot Structure, easily assembling, and requirement without concentricity, the required precision of processing can drop simpler than cartridge type shunting switch structure Low, beneficial to manufacture, and volume is significantly less than the cartridge type shunting switch of equivalent specifications.

Switching mechanism in the utility model can also work independently, and it upgrades to loaded switch as a kind of no load switch Upgraded module can individually add according to the actual requirements.It can synchronously complete the handoff procedure of incoming line, be cut in gear The transition stage for the transition stage changed, is automatically performed the intervention of transition resistance, and holding circuit does not power off.Its transition resistance and master Vacuum tube is provided with path, prevents that electric arc arcing occurs when movable contact spring and static contact are contacting and separating.

Brief description of the drawings

Fig. 1 is top perspective view obliquely of the present utility model.

Fig. 2 is face upwarding stereogram obliquely of the present utility model.

Fig. 3 is the structure chart of gear selection mechanism（Hide stationary contact installing plate）.

Fig. 4 is the moving contact relevant portion structure chart of gear selection mechanism.

Fig. 5 is the part explosive view of the moving contact of gear selection mechanism.

Fig. 6 is the component drawings of the moving contact of gear selection mechanism.

Fig. 7 is the stereogram of switching mechanism.

Fig. 8 is the side view of switching mechanism.

Fig. 9 is vacuum tube and the part explosive view of transition resistance side in switching mechanism.

The state diagram of vacuum tube side when Figure 10 is odd number gear in switching mechanism.

The state diagram of switching switch side when Figure 11 is odd number gear in switching mechanism.

The state diagram of vacuum tube side when Figure 12 is transition state in switching mechanism.

The state diagram of switching switch side when Figure 13 is transition state in switching mechanism.

The state diagram of vacuum tube side when Figure 14 is even numbers state in switching mechanism.

The state diagram of switching switch side when Figure 15 is even numbers state in switching mechanism.

Figure 16 is A-A sectional views in Figure 10.

Figure 17 is B-B sectional views in Figure 10.

Wherein 1 is gear selection mechanism, and 3 be switching mechanism, and 5 be mounting seat.

11 be stepper motor, and 12 be steering gear, and 13 be screw mandrel, and 14 be screw pair, and 15 be gangbar, and 16 be conductiving slide rail, 17 be the slide plate of gear selection mechanism, and 18 be movable contact spring seat, and 19 be vertical rack, and 20 be the peace of the static contact of gear selection mechanism Loading board, 21 be odd number static contact, and 22 be even numbers static contact, and 23 be the first spring lever, and 24 be the first spring, and 25 be stator.

31 be permanent magnet mechanism, and 32 be sliding shoe, and 33 be T-shaped slide rail, and 34 be leverage, and 35 be the first roller, and 36 be Second wheel, 37 be the 3rd roller, and 38 be buffer, and 39 be the elastic jacking block of buffer, and 40 be vacuum tube, and 41 be the dynamic of vacuum tube Conducting rod, 42 be transition resistance, and 43 be limited block, and 44 be the lower casing of buffer, and 45 be internal trolley, and 46 be the interior bullet of buffer Spring, 47 is switch the moving contacts of switch, and 48 is switch the conductor rail of switch, and 49 be the static contacts of switching switch.

Embodiment

Embodiment of the present utility model is further described below in conjunction with the accompanying drawings.

As shown in figure 1, linear permanent magnet vacuum load ratio bridging switch described in the utility model, by shell, switching mechanism Formed with gear selection mechanism, to show internal structure, shell only remains mounting seat 5, and remainder is opened up not in the drawings Show.

Gear selection mechanism is arranged on Fig. 1 right side, and switching switch is arranged on Fig. 1 left side, and gear selection mechanism is straight Wire type, realize the function of three-phase electricity synchronism switching.As shown in figure 3, the power section of gear selection mechanism is by stepper motor 11 Formed with screw mandrel 13, in order to save space, by stepper motor right angle setting, screw mandrel is horizontally disposed with, and the two passes through the phase of steering gear 12 Even.Screw mandrel 13 is connected with screw pair 14, and gangbar 15 is provided with screw pair.Mounting base 5 and vertical rack 19 are mutually perpendicular to, Gangbar 15 is parallel with screw mandrel through the through hole on vertical rack 19.

Fig. 4 is the motion parts structure chart of gear selection mechanism, and movable contact spring seat 18, the present embodiment are provided with gangbar 15 For three-phase electricity, the movable contact spring seat of three groups of synchronous workings is employed.The center of vertical rack 19 is additionally provided with conductor rail 16, conductive Rail has three, corresponds to three-phase electricity respectively.The lower end of slide plate 17 on movable contact spring seat is connected with conductiving slide rail 16 all the time.Vertical rack Top is fixed with the installing plate 20 of the static contact of gear selection mechanism.

Different from the gear on-off of routine, it is parallel with even numbers gear separately positioned that the utility model employs odd number gear Structure, to realize the switching of gear.Therefore conductiving slide rail 16 has two, corresponds to odd number gear and even numbers gear respectively.And stationary contact Head is set for L-shaped structure, and the static contact 21 of odd number gear is short, and the static contact 22 of even numbers gear is grown, thus it is alternate to form two row Static contact.

18 be that movable contact spring seat is arranged in gangbar, and is also divided into two groups of moving contacts, one group and odd number gear it is quiet Contact 21 is in contact, and the static contact 22 of another group and even numbers gear is in contact.As shown in figure 3, two moving contacts, according to 12nd, 23,34 ... pattern, alternating are in contact with static contact.

Fig. 5 provides the part explosive view of moving contact mounting seat, and Fig. 6 is the structure chart of moving contact mounting seat.Moving contact is pacified Fill seat pedestal on be provided with left and right two sets of slide plates, every movable contact spring by the first spring clamping on pedestal, the first spring lever Through after the first spring, the first movable contact spring, fixed by stator.Therefore two movable contact springs 17 are Elastic Contact static contact Side.

The slide plate 17 of gear selection mechanism is convex shape, and narrower one end is located at lower section, contacted with conductiving slide rail 16, wider One end it is above, be in contact with static contact.Static contact is provided with the both sides hair of circular arc chamfering, two slide plates and static contact During raw contact, slide plate can be made a concession under the action of the spring, then firmly be fitted on static contact.Spring is also avoided that stationary contact Direct collision occurs for head and slide plate, avoids slide plate from deforming, extends the service life of shunting switch.

Moving contact contact leaf length is much larger than the width of static contact, therefore moving contact is in the promotion lower slider of trace, Two moving contacts are able to ensure that static contact and moving contact are realized and contact and postpone separation in advance, and this is designed to anti-stop position switching When, arc discharge occurs between the moving contact and static contact of gear on-off, damages the contact reliability of contact and contact.It is originally Body only has two static state, but simple in construction, and switch speed is fast.Accordingly high speed gear it can switch.

Switching mechanism 3 is arranged on the opposite side of mounting seat 5.It is controlled by permanent magnet mechanism, in two gears and one Toggled between transition gear.

Fig. 7, Fig. 8 and Fig. 9 respectively show the internal structure i.e. internal breakup structure of switching mechanism.T-shaped slide rail 33 and peace Dress base 5 is fixedly connected.

The motion parts of switching mechanism, power is provided by permanent magnet mechanism 31, permanent magnet mechanism sheet is as one with reset bullet The electromagnetic switch of spring, coil electricity, magnetic field is produced, attract permanent magnet, the elastic force of back-moving spring is overcome, by the motion of permanent magnet mechanism Bar pulls to side；Coil losing electricity, the moving lever of permanent magnet mechanism then in the presence of back-moving spring, return to initial position.

The end of the moving lever of permanent magnet mechanism is connected with a lever construction 34, and the rotary shaft of leverage is arranged on T-shaped On slide rail 33, the stage casing of lever connects with the moving lever of permanent magnet mechanism, and the top of lever and the sliding shoe 32 of switching mechanism rotate Connection.Leverage amplifies the movement travel of the moving lever of permanent magnet mechanism, is advantageous to set switching switch, vacuum tube and transition Resistance, position collides with each other between solving them.

Fig. 9 and Figure 10 respectively show the structure of the both sides of switching mechanism, and wherein Fig. 9 sides are vacuum tube and transition electricity The arc extinguishing part of composition is hindered, Figure 10 sides are switching switch sections, and the two works asynchronously.

Limited block 43 is fixedly installed at the top of T-shaped slide rail, the top of sliding shoe 32 is provided with stopper slot, limited block and stopper slot Coordinate, limit the ultimate range of the two relative movement.Avoid damaging permanent magnet mechanism and leverage.

As seen from Figure 8, the inside of sliding shoe 32 is additionally provided with internal trolley 45, reduces friction of motion.

Fig. 9 and Figure 10 is one of inactive state of switching switch, i.e., when odd number gear is connected, after completing gear switching State.There are three groups of identical structures in Fig. 9, every group includes a main vacuum tube, a transition vacuum tube, two vacuum tubes Buffer and transition resistance, they are fixedly installed on the side of T-shaped slide rail.Main vacuum tube is located at right side, middle for mistake Resistance is crossed, left side is transition vacuum tube, transition vacuum tube and transition resistance series connection.

Three pulleys, i.e. first pulley 35, the pulley 37 of second pulley 36 and the 3rd are installed, wherein first on sliding shoe 32 Pulley and second pulley are highly identical, and the two spacing is larger, and the 3rd pulley position is more on the lower side.It is from spacing between second pulley It is smaller.

Vacuum tube buffer 38 is made up of lower casing 44, elastic jacking block 39 and spring 46, and spring groove, spring are provided with lower casing In spring groove, and elastic jacking block is withstood, the upper surface of elastic jacking block is truncated cone-shaped, and the bottom of spring jacking block 39 is set There is fastening point, fasten the matching ends of the moving conductive rod 41 of point and vacuum tube.The internal structure of buffer is as shown in figure 15, delays The inner spring 46 for rushing device jacks up elastic jacking block upwards, and when elastic jacking block is not pressurized, inner spring 46 is enough the dynamic of vacuum tube Conducting rod 41 is lifted up, and realizes the function that vacuum tube disconnects.

As shown in figure 9, when in odd number gear, first pulley 35 pushes down the buffer of main vacuum tube, and main vacuum tube connects It is logical, and the elastic jacking block of the buffer of transition vacuum tube is thin lower than the buffer elasticity jacking block of main vacuum tube, so transition Vacuum tube is in released state, and transition resistance does not work.Electric current flows through by main vacuum tube.

Figure 11 is that now main vacuum tube is between first pulley 35 and second pulley 36, main vacuum tube in shift process Separated under the elastic reaction of buffer, and the 3rd pulley presses the buffer of transition vacuum tube, transition vacuum tube is connected, mistake Cross resistance connection.

Because the elastic jacking block of buffer is pushed down by roller, vacuum tube begins to connect, it is possible to accomplishes to work as main vacuum Before pipe disconnects, transition vacuum tube is first connected；Then main vacuum tube disconnects, and electric current has again by transition vacuum tube and transition resistance Remained up in the case of load；Sliding shoe continues to move to right, and the buffer elasticity jacking block of main vacuum tube touches second pulley 36, and by Pressure, now main vacuum tube is again switched on, and the shift switch of opposite side, is changed to even numbers gear via odd number gear.

Sliding shoe continues to move to right, and the position that reaches capacity, and as shown in figure 13, the buffer of transition vacuum tube exits the 3rd cunning The lower section of wheel 37, internally realize and reset under spring effect, transition vacuum tube is disconnected, and now main vacuum tube is connected, and gear is by list Number gear switches to even numbers gear.

The buffer of transition vacuum tube, the thickness of its elastic jacking block are less than main vacuum tube buffer, and its thickness difference is more than The release travel of transition vacuum tube, so it will not also be pushed down by the first roller even at below the first roller, can continue to protect Hold the state being kept completely separate.

Correspondingly, switch sections are switched successively as shown in Figure 10, Figure 12 and Figure 14.The moving contact of switching switch is fixed on cunning On motion block 32, the static contact 49 for switching switch only has two gears, and the gear to be kept left in figure connects the odd number gear of gear selecting switch Conductor rail, the gear kept right connect even numbers gear conductor rail.

As shown in figure 15, the spring leaf of fluted, to be switched for switching moving contact contact chip is set to reserve shifting on sliding shoe Dynamic space.During the moving contact movement of switching switch, moving contact contact chip switches between two static contacts 49.Moving contact contacts Piece also is located in a pair of spring clamping states.When it contacts static contact, spring can absorb buffering vibration, extend the use of contact Life-span.

With the movement of sliding shoe 32, switch the movement simultaneously of switch sections and arc extinguishing part, in the same of single double gears switchings When, synchronously complete the vacuum extinction process for carrying circuit.

Gear on-off and switching switch be arranged in parallel by the utility model, so-called to be arranged in parallel, refer to gear on-off and cut It is identical to change the direction of motion of the motion of switch, mutually communication, and being integrated in a rectangular parallelepiped space, compared to Cartridge type shunting switch volume compact, has been reduced significantly installation volume.

Claims (10)

1. a kind of linear permanent magnet vacuum load ratio bridging switch, is made up of gear selection mechanism and switching mechanism, gear selection Multiple static contacts and matched moving contact are provided with mechanism；Switching mechanism includes switching switch, permanent magnet mechanism, main vacuum Pipe, transition vacuum tube and transition resistance；It is characterized in that：The gear selection mechanism and switching mechanism be arranged in parallel.

2. linear permanent magnet vacuum load ratio bridging switch according to claim 1, it is characterised in that：The gear selects machine The static contact of structure is arranged in stationary contact bracket, and slide rail, odd number moving contact and even numbers moving contact point are provided with stationary contact bracket The both sides of moving contact rack are not arranged on, while are in contact with an odd number static contact and an even numbers static contact；Moving contact Support is connected with pushing meanss；The pushing meanss are stepper motor, stepper motor and the silk being arranged on below moving contact rack Bar is connected, and screw pair is provided with moving contact rack.

3. linear permanent magnet vacuum load ratio bridging switch according to claim 2, it is characterised in that：The gear selects machine Structure is provided with three groups of moving contact racks that are identical, and being synchronized with the movement, is fixedly connected between three moving contact racks integrally, Connected by a screw pair with the screw mandrel that stepper motor is driven.

4. linear permanent magnet vacuum load ratio bridging switch according to claim 2, it is characterised in that：The gear selects machine The static contact of structure is L-shaped, and two row's static contact contacting points positions are concentrated by the contact extension being arranged at the top of stationary contact bracket To the side of stationary contact bracket.

5. linear permanent magnet vacuum load ratio bridging switch according to claim 2, it is characterised in that：The switching mechanism In, permanent magnet mechanism is arranged on the side of the pedestal of switching mechanism, the moving lever of switching mechanism and the sliding shoe phase of switching mechanism Even, the side of pedestal is provided with vacuum tube buffer, main vacuum tube, secondary vacuum tube and transition resistance, and opposite side is provided with switching The static contact group of switch and the moving contact of switching switch.

6. linear permanent magnet vacuum load ratio bridging switch according to claim 2, it is characterised in that：The switching mechanism A leverage is provided with pedestal, one end rotating shaft of leverage is arranged on pedestal, the moving lever and thick stick of permanent magnet mechanism The middle part of bar is hinged, and the other end of lever and the bearing pin being arranged on sliding shoe are rotatablely connected.

7. linear permanent magnet vacuum load ratio bridging switch according to claim 2, it is characterised in that：The switching mechanism Sliding shoe is internally provided with internal trolley, and internal trolley coordinates with the T-shaped slide rail on pedestal.

8. linear permanent magnet vacuum load ratio bridging switch according to claim 2, it is characterised in that：The switching mechanism Limit spacing block is installed with the top of pedestal, limit spacing block coordinates with the limit spacing hole on moving lever.

9. linear permanent magnet vacuum load ratio bridging switch according to claim 2, it is characterised in that：The gear selects machine The moving contact of structure, it is made up of the contact of left and right two and contact spring, the first spring lever and steady pin, is set on moving contact rack There are a spring lever positioning hole and contact mounting groove, the first spring lever sequentially passes through the first left spring, the first left movable contact spring, first right dynamic After contact, the first right spring, the both ends of the first spring lever are fixed by steady pin；The static contact of the gear selection mechanism Rounding on top surface.

10. linear permanent magnet vacuum load ratio bridging switch according to claim 2, it is characterised in that：The switching mechanism Switching switch moving contact by contact chip, sliding shoe, conductor rail, the second left movable contact spring, the second right movable contact spring and a pair second Spring is formed, and contact chip, which is arranged on, to be slided on bar, sliding shoe and T-shaped slide rail secure fit, is slided bar and is clamped in contact Piece bottom, slide and movable contact spring positioning hole is provided with bar, second spring bar positions through the movable contact spring on spring, slip bar Hole, by two panels the second movable contact spring flexible fastening；The top surface rounding of the static contact of the switching switch.