CN211788838U

CN211788838U - Electromagnetic contactor for electric locomotive

Info

Publication number: CN211788838U
Application number: CN202020045170.2U
Authority: CN
Inventors: 叶辉浩; 樊林清
Original assignee: Jiaxing Saitielong Electric Co ltd
Current assignee: Jiaxing Saitielong Electric Co ltd
Priority date: 2020-01-09
Filing date: 2020-01-09
Publication date: 2020-10-27
Anticipated expiration: 2030-01-09

Abstract

The utility model discloses an electromagnetic contactor for an electric locomotive, which comprises an electromagnetic contactor main body; a contact assembly; an arc extinguishing assembly; the electromagnetic contactor further comprises a contact actuation assembly, the contact actuation assembly comprises a first coil, a second coil and a movable assembly, the movable assembly comprises a movable iron core, a swing arm, a pressure spring and a contact fixing seat, the first coil is horizontally arranged, the movable iron core is coaxially arranged with the first coil and is positioned at one end of the first coil, one end of the movable iron core enters the first coil, the other end of the movable iron core is hinged with the middle part of the swing arm, one end of the swing arm is hinged with the electromagnetic contactor main body, the other end of the swing arm is hinged with the contact fixing seat, the contact fixing seat can slide along the horizontal direction; the pressure spring keeps applying a trend force to the movable iron core, and the trend force can make the movable iron core move towards the outside of the first coil; the coil suction control assembly comprises a first travel switch and a trigger assembly; the first coil is electrified to drive the movable contact to trigger the first travel switch, and the second coil is connected in series in a loop of the first coil.

Description

Electromagnetic contactor for electric locomotive

Technical Field

The utility model belongs to the technical field of electromagnetic contactor, specifically speaking relates to an electromagnetic contactor for electric locomotive.

Background

The electric locomotive and other locomotives installed with electric transmission devices are provided with a current transformer arranged in a traction main circuit. The traction converter functions to convert electrical energy between the dc system and the ac system and to control and regulate various traction motors to control the operation of the locomotive.

In order to realize the switching of the input end of the traction converter and the secondary side traction winding of the main transformer, an electromagnetic contactor is required to be installed in the traction auxiliary converter of the power-concentrated motor car; although the existing electromagnetic contactor can realize the on/off of the input end of the auxiliary converter and the secondary side auxiliary winding of the main transformer, because the voltage of the input end of the converter and the secondary side auxiliary winding of the main transformer is high and the current is large, strong electric arcs can be generated when the electromagnetic contactor is switched in an on-off mode, the existing electromagnetic contactor often adopts an arc extinguishing cover to extinguish the electric arcs, but the arc extinguishing effect is poor, so that the contacts and the internal structure of the electromagnetic contactor are often burnt by the electric arcs, and the electromagnetic contactor is damaged; in addition, when the electromagnetic contactor is closed, a coil with larger current and high attractive force is needed to be used for starting, the movable contact is contacted with the fixed contact, but the requirements on the power and the attractive force of the coil are reduced after starting, so that the movable contact and the fixed contact can be maintained to be continuously contacted in a long-term power-on running state only by a coil working with low power, in order to solve the problem, the starting coil is adopted for starting in the prior art, and after starting, the electronic module controls a series resistor in a loop of the starting coil to reduce the current of the starting coil so as to solve the problem, but the problems of high resistance heating amount and low stability of the electronic module in a high-voltage use environment exist; in addition, the arc-extinguishing cover is after using a period, and comparatively obvious damage can appear in the place that electric arc is comparatively concentrated in the arc-extinguishing cover to influence arc extinguishing effect, but other inside components and parts of electromagnetic contactor are still intact this moment, do not reach life, so if directly carry out the complete machine and change the cost too high, but continue to use and will have the risk.

Disclosure of Invention

The utility model aims at providing an electric locomotive uses electromagnetic contactor, its technical problem who anticipates to exist in solving the background art.

In order to solve the technical problem, the purpose of the utility model is to realize like this:

an electromagnetic contactor for an electric locomotive comprises an electromagnetic contactor main body; the contact assembly is positioned in the electromagnetic contactor main body and comprises a movable contact and a fixed contact; also comprises

The contact actuation assembly comprises a first coil, a second coil and a movable assembly, wherein the movable assembly comprises a movable iron core, a swing arm, a pressure spring and a contact fixing seat, the first coil is horizontally arranged, the movable iron core is coaxially arranged with the first coil and is positioned at one end of the first coil, one end of the movable iron core enters the first coil, the other end of the movable iron core is hinged with the middle part of the swing arm, one end of the swing arm is hinged with the electromagnetic contactor main body, the other end of the swing arm is hinged with the contact fixing seat, the contact fixing seat can slide along the horizontal direction, and the movable contact is connected with the contact fixing seat; when the first coil is electrified to enable the movable iron core to further move towards the inside of the first coil, the contact fixing seat can be driven to slide in the same direction, and the movable contact is in contact with the static contact; the pressure spring keeps applying a trend force to the movable iron core, and the trend force can make the movable iron core move to the outside of the first coil;

the coil suction control assembly comprises a first travel switch and a trigger assembly; the trigger component is linked with the contact fixing seat, and when the first coil is electrified to drive the movable contact to be contacted with the fixed contact, the trigger component triggers the first travel switch to realize that the second coil is connected in series in a loop of the first coil;

the arc extinguishing assembly comprises an arc extinguishing cover, and the arc extinguishing cover is arranged outside the movable contact and the fixed contact.

On the basis of the above scheme and as a preferable scheme of the scheme: the trigger assembly can synchronously trigger the first travel switch and the second travel switch.

On the basis of the above scheme and as a preferable scheme of the scheme: the auxiliary contact comprises an auxiliary fixed contact and an auxiliary moving contact, the auxiliary moving contact is connected to the contact fixing seat through a compensation assembly, and the minimum distance between the auxiliary fixed contact and the auxiliary moving contact is smaller than the minimum distance between the fixed contact and the moving contact.

On the basis of the above scheme and as a preferable scheme of the scheme: the movable contact is connected with the movable contact and the auxiliary movable contact through a first flexible conductor and a second flexible conductor respectively; the movable contact position adjusting assembly comprises an adjusting screw and a buffering pressure spring, the contact fixing seat is hollow to form a movable contact accommodating cavity, and the adjusting screw penetrates into the movable contact accommodating cavity from the outside of the accommodating cavity and is in threaded connection with the movable contact; the buffer compression spring is sleeved outside the adjusting screw, one end of the buffer compression spring is in contact with the movable contact, the other end of the buffer compression spring is in contact with the side wall of the accommodating cavity, and the adjusting screw is in clearance fit with the side wall of the accommodating cavity.

On the basis of the above scheme and as a preferable scheme of the scheme: and the normally closed contact of the first travel switch is connected with the second coil in parallel and then connected in series in a loop of the first coil.

On the basis of the above scheme and as a preferable scheme of the scheme: the swing arm including the symmetry set up in move the first swing arm and the second swing arm of iron core both sides, first swing arm and second swing arm are straight form, move iron core one end respectively with first swing arm and second swing arm middle part are articulated, first swing arm with the second swing arm same end is articulated with the electromagnetic contactor main part, the two other end with the contact fixing base is articulated.

On the basis of the above scheme and as a preferable scheme of the scheme: the arc extinguishing assembly further comprises an arc striking assembly, the arc striking assembly comprises an arc striking coil and magnetic flux plates symmetrically arranged on two sides of the contact assembly, a magnetic conduction column penetrates through the middle of the arc striking coil, the magnetic flux plates are respectively in contact with two end faces of the magnetic conduction column, and the magnetic flux plates are located in the electromagnetic contactor body and attached to the outer surface of the arc extinguishing cover.

On the basis of the above scheme and as a preferable scheme of the scheme: the arc welding device also comprises a first arc ignition plate and a second arc ignition plate; the first arc striking plate is positioned above the movable contact, the front end of the first arc striking plate is close to the movable contact, and the rear end of the first arc striking plate extends into the arc extinguishing cover; the second arc ignition plate is positioned above the fixed contact, the front end of the second arc ignition plate is close to the fixed contact, and the rear end of the second arc ignition plate extends into the arc extinguishing cover.

On the basis of the above scheme and as a preferable scheme of the scheme: the arc extinguishing cover is detachably and fixedly arranged on the electromagnetic contactor main body through a quick-release assembly.

On the basis of the above scheme and as a preferable scheme of the scheme: the quick release assembly comprises a clamping part fixedly arranged on the electromagnetic contactor body and a clamping piece connected to the arc extinguishing cover, the clamping piece is provided with a clamping part bent or protruded towards the clamping part, and the clamping part is clamped on the clamping part after the arc extinguishing cover is tightly pressed on the upper end surface of the electromagnetic contactor body; the clamping portion is provided with a handle on one side departing from the clamping portion, and the clamping portion can be separated from the clamping portion by applying an external force to the handle.

Compared with the prior art, the utility model outstanding and profitable technological effect is:

1. by arranging the auxiliary fixed contact and the auxiliary movable contact, and the minimum distance between the auxiliary fixed contact and the auxiliary movable contact is smaller than the minimum distance between the fixed contact and the movable contact, the auxiliary movable contact and the auxiliary fixed contact are contacted firstly before the movable contact and the fixed contact are contacted; after the movable contact and the fixed contact are separated, the auxiliary movable contact and the auxiliary fixed contact are separated finally, and the auxiliary fixed contact and the auxiliary movable contact are closer to the arc-extinguishing chamber, so that electric arcs can be better introduced into the arc-extinguishing chamber; in addition, the fixed contact and the movable contact are used as main working contacts, and electric arcs are mainly generated on the auxiliary fixed contact and the auxiliary movable contact after the arrangement, so that ablation damage of the fixed contact and the movable contact is avoided, and the service life of the electromagnetic contactor is greatly prolonged.

2. The normally closed contact of the first travel switch is connected with the second coil (the holding coil) in parallel and then connected in series in the loop of the first coil, so that the normally closed contact of the first travel switch can be in short circuit with the second coil when the first travel switch is started, the voltage of a starting power supply is directly loaded at two ends of the first coil, and after the movable iron core of the first coil (the starting coil) is sucked downwards to enable the movable contact to be in contact with the fixed contact, the pressing block can press the contact at the beginning of the first travel to enable the normally closed contact to be separated, so that the second coil is connected in series in the loop of the first coil, the effects of reducing voltage and limiting current are realized, the power of the first coil is reduced, and the heat productivity of the first; and a mechanical switching mode is adopted, so that the reliability is high, the cost is low, the interference is not easy to happen, and the long-term stable operation in a high-pressure environment is facilitated.

3. The arc-extinguishing cover sets firmly on the electromagnetic contactor main part through a quick detach subassembly detachable, just so can make electromagnetic contactor can continue good operation through the mode of quick replacement arc-extinguishing cover when the arc-extinguishing cover damages, avoids current electromagnetic contactor arc-extinguishing cover integral design, is unfavorable for the maintenance, and the problem that the maintenance cost is high is led to maintaining to the overall change of arc-extinguishing cover problem appearance.

4. The magnetic flux board of striking subassembly sets up in the electromagnetic contactor main part to be located the arc-extinguish chamber both sides, adopted the position that is close to the sound contact more, and the area of magnetic flux board strengthens, more be favorable to introducing the electric arc that produces the sound contact in the arc-extinguish chamber, thereby make the quick extinguishing of electric arc, avoid the electromagnetic contactor arc extinguishing effect among the prior art not good, lead to drawing the problem that the arc damaged electromagnetic contactor and other accessory circuits for a long time.

5. The first arc striking plate and the second arc striking plate are added to further enhance the arc striking effect, so that the arc extinguishing speed is higher.

Drawings

Fig. 1 is a perspective view of the overall structure of the present invention;

fig. 2 is another perspective view of the overall structure of the present invention;

FIG. 3 is a front view of the overall structure of the present invention;

FIG. 4 is a schematic structural view of an arc striking assembly;

FIG. 5 is a schematic view of the internal structure of the present invention;

FIG. 6 is a perspective view of the internal structure of the present invention;

fig. 7 is a schematic diagram of the coil attracting control principle of the present invention.

Detailed Description

In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step, based on the given embodiments, fall within the scope of protection of the present application.

In the description of the present application, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

In the description of the present application, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated.

Referring to fig. 1 to 5, an electromagnetic contactor for an electric locomotive includes an electromagnetic contactor main body 10; a contact assembly 20, located inside the electromagnetic contactor body 10, including a movable contact 22 and a stationary contact 21; also comprises

The contact attraction assembly 30 comprises a first coil 31, a second coil 32 and a moving assembly 33, wherein the moving assembly comprises a moving iron core 331, a swing arm 332, a pressure spring (not shown in the drawing and located in the hollow part of the middle of the first coil 31) and a contact fixing seat 334, the first coil 31 is horizontally arranged, the moving iron core 331 is coaxially arranged with the first coil 31 and located at one end of the first coil 31, one end of the moving iron core 331 enters the first coil 31, the other end of the moving iron core is hinged to the middle of the swing arm 332 through a hinge shaft 33, one end of the swing arm 332 is hinged to the base connecting piece 11 of the electromagnetic contactor main body 10, and the other end of the swing arm 332 is hinged to the; a horizontal rail 336 is fixedly arranged on the electromagnetic contactor main body 10, the contact fixing seat 334 is slidably arranged on the horizontal rail 336, so that the contact fixing seat 334 can slide along the horizontal direction of the horizontal rail 336 while the swing arm 332 swings, and the movable contact 331 is connected with the contact fixing seat 334; when the first coil 31 is powered on and the movable iron core 331 moves further into the first coil 31 against the elastic force of the compression spring, the swing arm 332 can be pulled to swing towards the direction of the first coil 31, so as to drive the contact fixing seat 334 and the movable contact 22 to move towards the direction of the stationary contact 21, and the movable contact 22 is in contact with the stationary contact 21, so that the circuit is connected; the pressure spring keeps applying a trend power to moving iron core 331, this trend power can make moving iron core 331 move to first coil 31 outside, it is concrete, when first coil outage, the appeal of first coil disappears, the elasticity of pressure spring is leading direct action on moving iron core 331, thereby make moving iron core move to first coil outside, just so drive the swing arm simultaneously and swing to the direction of keeping away from first coil, thereby realize driving contact fixing base and movable contact and remove to initial position, thereby make the stationary contact and movable contact separate, with the circuit disconnection. Preferably, in the present embodiment, the first coil and the second coil are coaxial windings, the second coil is an outermost coil, and the outermost coil assembly size: 150 (length) × 90 (diameter), on the premise of meeting the use requirement, the weight of the whole machine is reduced compared with the coil size 150 (length) × 100 (diameter) of the existing electromagnetic contactor; on the other hand, the peripheral size of the coil is reduced, so that the side plate does not need to be hollowed out, the bearing capacity of the side plate is increased, and fracture caused by long-time follow-up use is prevented.

In order to simplify the technology, reduce the product production degree of difficulty, this embodiment is preferred the swing arm including the symmetry set up in first swing arm 3321 and second swing arm 3322 of movable iron core both sides, first swing arm 3321 and second swing arm 3322 are straight form, and movable iron core 31 one end is articulated with first swing arm 3321 and second swing arm 3322 middle part respectively, and first swing arm 3321 and the same end of second swing arm 3322 are articulated with electromagnetic contactor main part 10, and the other end of the two is articulated with contact fixing base 334. After the contact attraction assembly is arranged, the contact attraction assembly can move more stably and stably, the stability is greatly improved, the process is simplified, and the production difficulty of products is reduced.

Further, the auxiliary contact 23 is included, the auxiliary contact 23 includes an auxiliary fixed contact 231 and an auxiliary movable contact 232, the auxiliary movable contact 232 is connected to the contact holder 334 through a compensation assembly 27, and the minimum distance between the auxiliary fixed contact 231 and the auxiliary movable contact 232 is smaller than the minimum distance between the fixed contact 21 and the movable contact 22. Preferably, the compensation assembly 27 includes a movable seat 271, a spring 272 and a connecting seat 273, the auxiliary moving contact is fixedly disposed at the front end of the movable seat 271, the lower portion of the front end of the movable seat 271 is hinged to the connecting seat 273, and a spring 272 is disposed between the lower portion of the rear end of the movable seat 271 and the connecting seat 273; the upper end of the spring 272 is contacted with the lower part of the rear end of the movable seat 271, and the lower end is contacted with the upper end of the connecting seat 273; because the minimum distance between the auxiliary fixed contact 231 and the auxiliary movable contact 232 is smaller than the minimum distance between the fixed contact 21 and the movable contact 22, after the auxiliary movable contact is contacted with the auxiliary fixed contact, the contact fixing seat can further move until the fixed contact is contacted with the movable contact 22, at the moment, the auxiliary movable contact 232 can absorb excessive contact displacement in a mode of compressing the spring 272 by rotating the movable contact 271, namely, when the fixed contact and the movable contact are attracted, the auxiliary movable contact and the auxiliary fixed contact are attracted in advance; when the fixed contact and the movable contact are disconnected, because the minimum distance between the auxiliary fixed contact 231 and the auxiliary movable contact 232 is smaller than the minimum distance between the fixed contact 21 and the movable contact 22, the fixed contact and the movable contact are firstly separated, then the spring 272 begins to extend from the compression, so that the movable seat 271 is driven to rotate towards the auxiliary fixed contact, the displacement of the fixed contact seat is compensated, the limit of spring compensation is reached after the fixed contact and the movable contact are completely separated by a sufficient distance, and at the moment, the auxiliary fixed contact and the auxiliary movable contact are separated. By arranging the auxiliary fixed contact and the auxiliary movable contact, and the minimum distance between the auxiliary fixed contact and the auxiliary movable contact is smaller than the minimum distance between the fixed contact and the movable contact, the auxiliary movable contact and the auxiliary fixed contact are contacted firstly before the movable contact and the fixed contact are contacted; after the movable contact and the fixed contact are separated, the auxiliary movable contact and the auxiliary fixed contact are separated finally, and the auxiliary fixed contact and the auxiliary movable contact are closer to the arc-extinguishing chamber, so that electric arcs can be better introduced into the arc-extinguishing chamber; in addition, the fixed contact and the movable contact are used as main working contacts, and electric arcs are mainly generated on the auxiliary fixed contact and the auxiliary movable contact after the arrangement, so that ablation damage of the fixed contact and the movable contact is avoided, and the service life of the electromagnetic contactor is greatly prolonged.

The movable contact position adjusting assembly 28 is connected with the movable contact 22 and the auxiliary movable contact 232 through a first flexible conductor 251 and a second flexible conductor 252 respectively; the moving contact position adjusting assembly 28 comprises an adjusting screw 281, an adjusting block 282 and a buffer pressure spring 283, the contact fixing seat 334 is hollow to form a moving contact accommodating cavity, the adjusting screw 381 penetrates into the moving contact accommodating cavity from the outside of the accommodating cavity and is in threaded connection with the adjusting block 282, and the moving contact is fixedly connected with the adjusting block 282; the buffer compression spring 283 is sleeved outside the adjusting screw 281, one end of the buffer compression spring is contacted with the adjusting block 282, the other end of the buffer compression spring is contacted with the side wall of the movable contact accommodating cavity, and the adjusting screw 281 is in clearance fit with the side wall of the movable contact accommodating cavity. The forward or reverse rotation of the adjusting screw 281 can make the adjusting block communicate the moving contact to approach or separate from the stationary contact, thereby facilitating the adjustment of the moving stroke required by the contact between the moving contact and the stationary contact.

The coil suction control component comprises a first travel switch 51 and a trigger component 337; the trigger component 337 is linked with the contact fixing seat 334, when the first coil 31 is electrified to drive the movable contact 22 to contact with the stationary contact 21, the trigger component 337 triggers the first travel switch 51, so that the second coil 32 is connected in series in the loop of the first coil 31; specifically, the triggering assembly 337 includes a first connecting member 3371, a second connecting member 3372, a driving swing arm 3373 and a rotating shaft 3374, which are fixedly disposed on the contact fixing base 334; the first connecting piece 3371 is vertically arranged, one end of the first connecting piece 3371 is fixedly connected with the contact fixing seat 334, the other end of the first connecting piece 3372 is hinged with one end of the second connecting piece 3372, the other end of the second connecting piece 3372 is hinged with one end of the driving swing arm 3373, the driving swing arm 3373 is fixedly connected with the rotating shaft 3374, and the peripheral surface of the rotating shaft 3374 is provided with a raised trigger block 33741; when the contact fixing seat 334 moves towards the direction of the stationary contact, the first connecting member 3371, the second connecting member 3372 and the driving swing arm 3373 are driven to rotate the rotating shaft 3374, so that the triggering block 33741 rotates counterclockwise to the position where the contact 511 of the first travel switch 51 is located, and the first travel switch 51 is triggered by the pressing contact 511. With reference to fig. 7, the first coil 31 and the second coil 32 are separated and arranged side by side, which is beneficial to heat dissipation of the coils; normally closed contact SQ1 of first travel switch with second coil 32 connects in series in the return circuit of first coil 31 after connecting in parallel, so first travel switch's normally closed contact can short circuit the second coil when starting to the voltage of starting power supply directly loads at first coil both ends, inhales under first coil (starting coil) movable iron core and makes movable contact and quiet contact after, trigger block 33741 can push down the contact of first stroke start, makes normally closed contact separation, thereby realizes that the second coil connects in series in the return circuit of first coil, realizes the effect of step-down current-limiting.

Further preferably, the device further comprises a second travel switch 52 and a second travel switch, and the trigger component can trigger the first travel switch and the second travel switch synchronously; specifically, two trigger blocks 33741 are arranged on the rotating shaft 3374 side by side, each trigger block 33741 corresponds to a first travel switch and a second travel switch, respectively, so that in the process that the movable iron core 331 is attracted by the first coil 31 to move into the first coil or moves out of the first coil under the action of a compression spring, the two trigger blocks 33741 can simultaneously contact the contact 511 of the first travel switch 51 and the contact of the second travel switch and press the contacts downwards or be far away from the release contacts, and the contacts inside the first travel switch 51 and the second travel switch are switched on or off. It should be noted that the second travel switch 52 is used to connect with the communication interface 53, and after the movable contact and the fixed contact are closed to the designated positions, the contacts inside the second travel switch 52 are triggered, so as to satisfy the transmission of signals, and then the signals can be fed back through the communication interface 53 and the external control system.

The arc extinguishing assembly, specifically, the arc extinguishing assembly 40 includes an arc extinguishing chamber 41, and the arc extinguishing chamber 41 is covered outside the movable contact 22 and the stationary contact 21. The arc extinguishing assembly 40 further comprises an arc striking assembly 42, the arc striking assembly 42 comprises an arc striking coil 421 and magnetic flux plates 422 symmetrically arranged on two sides of the contact assembly 20, a magnetic conductive column 4211 penetrates through the middle of the arc striking coil 421, the magnetic flux plates 422 are respectively in contact with two end surfaces of the magnetic conductive column 4211, and the magnetic flux plates 422 are located in the electromagnetic contactor main body 10 and attached to the outer surface of the arc extinguishing cover 41. Preferably, the wire diameter of the arc striking coil 421 is increased from Φ 1.8 to Φ 2.0, so as to increase the magnetic flux, and the magnetic flux plate further extends above and below the contact assembly, for example, the magnetic flux plate is increased to 50mm on the basis of the existing magnetic flux plate, so that the arc is more easily introduced into the arc extinguishing chamber, and the problem that the existing electromagnetic contactor cannot normally draw the arc or draw the arc unstably is solved.

Further preferably, the arc welding device further comprises a first arc ignition plate 451 and a second arc ignition plate 452; the first arc-striking plate 451 is positioned above the moving contact 22, the front end of the first arc-striking plate is close to the moving contact 22, and the rear end of the first arc-striking plate extends into the arc-extinguishing chamber 41; the second arc-striking plate 452 is located above the stationary contact 21, and the front end of the second arc-striking plate is close to the stationary contact 21, and the rear end of the second arc-striking plate extends into the arc-extinguishing chamber 41. The first arc striking plate and the second arc striking plate are added to further enhance the arc striking effect, so that the arc extinguishing speed is higher. Preferably, an arc striking coil protection plate 453 is further included, and the arc striking coil protection plate 453 prevents the arc from burning the arc striking coil. Preferably, the arc striking coil is wrapped the one deck with the glass silk area half-lap, and the arc striking coil outside is covered with epoxy pipe, increases the protectiveness and avoids the external world to cause the damage to the coil, influences its performance.

After the arc-extinguishing cover is used for a period of time, comparatively obvious damage can appear in the place that electric arc is comparatively concentrated in the arc-extinguishing cover to influence arc extinguishing effect, but inside other components and parts of electromagnetic contactor are still intact this moment, do not reach life, so if directly carry out the complete machine and change the cost too high, but continue to use and will have the risk, for this application further preferred arc-extinguishing cover 41 set firmly in through a quick detach subassembly 46 detachable on the electromagnetic contactor main part 10. Specifically, the quick release assembly 46 includes a clamping portion 462 fixedly disposed on the electromagnetic contactor body 10, and a clamping piece 461 connected to the arc extinguishing cover 41, where the clamping piece 461 has a clamping portion 4611 bent or protruded toward the clamping portion 462, and after the arc extinguishing cover 41 is pressed against the upper end surface of the electromagnetic contactor body 10, the clamping portion 4611 is clamped on the clamping portion 462; the locking portion 4611 is provided with a handle 46111 on a side away from the locking portion 462, and the locking portion 462 can be separated from the locking portion 4611 by applying an external force to the handle 46111. The arc extinguishing device further comprises a supporting column 463, the clamping sheet 461 rotates around the supporting column 463, the upper end 4612 of the clamping sheet 461 abuts against the outer shell of the arc extinguishing chamber 41, and therefore when the clamping portion 4611 clamps the clamping portion 462, a trend force is generated due to elastic deformation of the clamping sheet 461, and the trend force enables the clamping portion 4611 to be clamped on the clamping portion 462. With arc-extinguishing chamber 41 set firmly in the electromagnetic contactor main part through a quick detach subassembly 46 detachable, just so can make electromagnetic contactor can continue good operation through the mode of quick replacement arc-extinguishing chamber when arc-extinguishing chamber 41 damages, avoid current electromagnetic contactor arc-extinguishing chamber integral design, be unfavorable for the maintenance, the problem that the maintenance cost is high is led to maintaining to the overall change of arc-extinguishing chamber goes wrong.

The above-mentioned embodiment is only the preferred embodiment of the present invention, and does not limit the protection scope of the present invention according to this, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. An electromagnetic contactor for an electric locomotive comprises an electromagnetic contactor main body; the contact assembly is positioned in the electromagnetic contactor main body and comprises a movable contact and a fixed contact; the method is characterized in that: also comprises

The contact actuation assembly comprises a first coil, a second coil and a movable assembly, wherein the movable assembly comprises a movable iron core, a swing arm, a pressure spring and a contact fixing seat, the first coil is horizontally arranged, the movable iron core is coaxially arranged with the first coil and is positioned at one end of the first coil, one end of the movable iron core enters the first coil, the other end of the movable iron core is hinged with the middle part of the swing arm, one end of the swing arm is hinged with the electromagnetic contactor main body, the other end of the swing arm is hinged with the contact fixing seat, the contact fixing seat can slide along the horizontal direction, and the movable contact is connected with the contact fixing seat; when the first coil is electrified to enable the movable iron core to further move towards the inside of the first coil, the contact fixing seat can be driven to slide in the same direction, and the movable contact is in contact with the fixed contact; the pressure spring keeps applying a trend force to the movable iron core, and the trend force can make the movable iron core move to the outside of the first coil;

2. The electromagnetic contactor for an electric locomotive according to claim 1, wherein: the trigger assembly can synchronously trigger the first travel switch and the second travel switch.

3. The electromagnetic contactor for an electric locomotive according to claim 1, wherein: and the normally closed contact of the first travel switch is connected with the second coil in parallel and then connected in series in a loop of the first coil.

4. The electromagnetic contactor for an electric locomotive according to claim 1, wherein: the auxiliary contact comprises an auxiliary fixed contact and an auxiliary moving contact, the auxiliary moving contact is connected to the contact fixing seat through a compensation assembly, and the minimum distance between the auxiliary fixed contact and the auxiliary moving contact is smaller than the minimum distance between the fixed contact and the moving contact.

5. The electromagnetic contactor for an electric locomotive according to claim 4, wherein: the movable contact is connected with the movable contact and the auxiliary movable contact through a first flexible conductor and a second flexible conductor respectively; the movable contact position adjusting assembly comprises an adjusting screw and a buffering pressure spring, the contact fixing seat is hollow to form a movable contact accommodating cavity, and the adjusting screw penetrates into the movable contact accommodating cavity from the outside of the accommodating cavity and is in threaded connection with the movable contact; the buffer compression spring is sleeved outside the adjusting screw, one end of the buffer compression spring is in contact with the movable contact, the other end of the buffer compression spring is in contact with the side wall of the accommodating cavity, and the adjusting screw is in clearance fit with the side wall of the accommodating cavity.

6. The electromagnetic contactor for an electric locomotive according to claim 1, wherein: the swing arm including the symmetry set up in move the first swing arm and the second swing arm of iron core both sides, first swing arm and second swing arm are straight form, move iron core one end respectively with first swing arm and second swing arm middle part are articulated, first swing arm with the second swing arm same end is articulated with the electromagnetic contactor main part, the two other end with the contact fixing base is articulated.

7. The electromagnetic contactor for an electric locomotive according to claim 1, wherein: the arc extinguishing assembly further comprises an arc striking assembly, the arc striking assembly comprises an arc striking coil and magnetic flux plates symmetrically arranged on two sides of the contact assembly, a magnetic conduction column penetrates through the middle of the arc striking coil, the magnetic flux plates are respectively in contact with two end faces of the magnetic conduction column, and the magnetic flux plates are located in the electromagnetic contactor body and attached to the outer surface of the arc extinguishing cover.

8. The electromagnetic contactor for an electric locomotive according to claim 1, wherein: the arc welding device also comprises a first arc ignition plate and a second arc ignition plate; the first arc striking plate is positioned above the movable contact, the front end of the first arc striking plate is close to the movable contact, and the rear end of the first arc striking plate extends into the arc extinguishing cover; the second arc ignition plate is positioned above the fixed contact, the front end of the second arc ignition plate is close to the fixed contact, and the rear end of the second arc ignition plate extends into the arc extinguishing cover.

9. The electromagnetic contactor for an electric locomotive according to claim 1, wherein: the arc extinguishing cover is detachably and fixedly arranged on the electromagnetic contactor main body through a quick-release assembly.

10. The electromagnetic contactor for an electric locomotive according to claim 9, wherein: the quick release assembly comprises a clamping part fixedly arranged on the electromagnetic contactor body and a clamping piece connected to the arc extinguishing cover, the clamping piece is provided with a clamping part bent or protruded towards the clamping part, and the clamping part is clamped on the clamping part after the arc extinguishing cover is tightly pressed on the upper end surface of the electromagnetic contactor body; the clamping portion is provided with a handle on one side departing from the clamping portion, and the clamping portion can be separated from the clamping portion by applying an external force to the handle.