An electromagnetic contactor for electric locomotive

Abstract

The invention discloses an electromagnetic contactor for electric locomotive, comprising an electromagnetic contactor body; a contact assembly; an arc extinguishing assembly; and a contact suction assembly, comprising a first coil, a second coil and a moving assembly, wherein the moving assembly comprises a moving iron core, a swing arm, a compression spring and a contact fixing seat, wherein the first coil is arranged horizontally, the moving iron core is arranged coaxially with the first coil and is located at one end of the first coil, one end of the moving iron core enters the first coil, and the other end is hinged to the middle part of the swing arm, one end of the swing arm is hinged to the electromagnetic contactor body, and the other end is hinged to the contact fixing seat, the contact fixing seat can slide in a horizontal direction, and the moving contact is connected to the contact fixing seat; the compression spring keeps applying a tendency force to the moving iron core, and the tendency force can make the moving iron core move toward the outside of the first coil; the coil suction control assembly comprises a first travel switch and a trigger assembly; when the first coil is energized, the moving contact is driven to trigger the first travel switch, and the second coil is connected in series in the loop of the first coil.

Description

Technical Field

[0001] The invention belongs to the technical field of electromagnetic contactors, and in particular relates to an electromagnetic contactor for electric locomotives. Background Art

[0002] The converter installed in the traction main circuit of electric locomotives and other locomotives equipped with electric transmission devices. The function of the traction converter is to convert the electrical energy between DC and AC, and to control and regulate various traction motors, thereby controlling the operation of the locomotive.

[0003] In order to realize the separation and combination of the traction converter input terminal and the secondary traction winding of the main transformer, it is necessary to install an electromagnetic contactor in the traction auxiliary converter of the power concentrated EMU; although the existing electromagnetic contactor can realize the separation / combination of the auxiliary converter input terminal and the secondary auxiliary winding of the main transformer, due to the high voltage and large current between the converter input terminal and the secondary auxiliary winding of the main transformer, a strong arc will be generated when the electromagnetic contactor switches from closing to opening. The existing technology often uses an arc extinguishing hood to extinguish the arc, but the arc extinguishing effect is not good, which often causes the contacts and internal structure of the electromagnetic contactor to be burned by the arc, resulting in damage to the electromagnetic contactor; in addition, when the electromagnetic contactor is closed, it is necessary to use a coil with a larger current and a higher attraction to start the moving contact and contact the static contact, but after starting, the power of the coil is The requirements for rate and attraction will be reduced, so only a coil with low power can maintain continuous contact between the moving contact and the static contact under long-term energized operation. In order to solve this problem, the prior art uses a starting coil for starting, and after starting, the electronic module controls the series connection of a resistor in the loop of the starting coil to reduce the current of the starting coil to solve the above problem. However, it has the problems of high heating of the resistor and low stability of the electronic module in a high-voltage use environment. In addition, after the arc extinguishing hood has been used for a period of time, the arc extinguishing hood will be more obviously damaged in places where the arc is more concentrated, thereby affecting the arc extinguishing effect. However, at this time, other components inside the electromagnetic contactor are still intact and have not reached their service life. If the entire machine is directly replaced, the cost will be too high, but there will be risks in continuing to use it. Summary of the invention

[0004] The purpose of the present invention is to provide an electromagnetic contactor for electric locomotive, which is intended to solve the technical problems existing in the background technology.

[0005] To solve the above technical problems, the purpose of the present invention is achieved as follows:

[0006] An electromagnetic contactor for an electric locomotive comprises an electromagnetic contactor body; a contact assembly located in the electromagnetic contactor body and comprising a moving contact and a static contact; and

[0007] A contact pull-in assembly comprises a first coil, a second coil and a moving assembly, wherein the moving assembly comprises a moving iron core, a swing arm, a compression spring and a contact fixing seat, wherein the first coil is arranged horizontally, the moving iron core is arranged coaxially with the first coil and is located at one end of the first coil, one end of the moving iron core enters the interior of the first coil, and the other end is hinged to the middle part of the swing arm, one end of the swing arm is hinged to the electromagnetic contactor body, and the other end is hinged to the contact fixing seat, the contact fixing seat can slide in the horizontal direction, and the moving contact is connected to the contact fixing seat; when the first coil is energized to make the moving iron core move further into the first coil, the contact fixing seat can be driven to slide in the same direction, so that the moving contact contacts the static contact; the compression spring keeps applying a tendency force to the moving iron core, and the tendency force can make the moving iron core move to the outside of the first coil;

[0008] The coil pull-in control component includes a first travel switch and a trigger component; the trigger component is linked with the contact fixing seat, and when the first coil is energized to drive the moving contact to contact the static contact, the trigger component triggers the first travel switch to connect the second coil in series with the loop of the first coil;

[0009] An arc extinguishing assembly comprises an arc extinguishing cover, and the arc extinguishing cover is arranged outside the moving contact and the static contact.

[0010] On the basis of the above scheme and as a preferred scheme of the above scheme: it also includes a second travel switch, and the trigger component can trigger the first travel switch and the second travel switch synchronously.

[0011] On the basis of the above scheme and as a preferred scheme of the above scheme: it also includes auxiliary contacts, the auxiliary contacts include auxiliary static contacts and auxiliary moving contacts, the auxiliary moving contacts are connected to the contact fixing seat through a compensation component, and the minimum spacing between the auxiliary static contacts and the auxiliary moving contacts is smaller than the minimum spacing between the static contacts and the moving contacts.

[0012] On the basis of the above scheme and as a preferred scheme of the above scheme: it also includes a moving contact lead-out terminal and a moving contact position adjustment component, the moving contact lead-out terminal is connected to the moving contact and the auxiliary moving contact respectively through a first flexible conductor and a second flexible conductor; the moving contact position adjustment component includes an adjusting screw and a buffer compression spring, the contact fixing seat is hollow to form a moving contact accommodating chamber, the adjusting screw is inserted into the moving contact accommodating chamber from the outside of the accommodating chamber and is threadedly connected to the moving contact; the buffer compression spring is sleeved on the outside of the adjusting screw, and one end contacts the moving contact and the other end contacts the side wall of the accommodating chamber, and the adjusting screw is clearance-matched with the side wall of the accommodating chamber.

[0013] On the basis of the above scheme and as a preferred scheme of the above scheme: the normally closed contact of the first travel switch is connected in parallel with the second coil and then connected in series in the loop of the first coil.

[0014] On the basis of the above scheme and as a preferred scheme of the above scheme: the swing arm includes a first swing arm and a second swing arm symmetrically arranged on both sides of the moving iron core, the first swing arm and the second swing arm are both straight, one end of the moving iron core is hinged to the middle part of the first swing arm and the second swing arm respectively, the same end of the first swing arm and the second swing arm is hinged to the electromagnetic contactor body, and the other ends of the two are hinged to the contact fixing seat.

[0015] On the basis of the above scheme and as a preferred scheme of the above scheme: the arc extinguishing assembly also includes an arc striking assembly, the arc striking assembly includes an arc striking coil and magnetic flux plates symmetrically arranged on both sides of the contact assembly, a magnetic conductive column is passed through the middle of the arc striking coil, the magnetic flux plates are respectively in contact with the two end surfaces of the magnetic conductive column, and the magnetic flux plates are located in the electromagnetic contactor body and are attached to the outer surface of the arc extinguishing cover.

[0016] On the basis of the above scheme and as a preferred scheme of the above scheme: it also includes a first arc-striking plate and a second arc-striking plate; the first arc-striking plate is located above the moving contact, with the front end close to the moving contact and the rear end extending into the arc-extinguishing cover; the second arc-striking plate is located above the static contact, with the front end close to the static contact and the rear end extending into the arc-extinguishing cover.

[0017] On the basis of the above solution and as a preferred solution of the above solution: the arc extinguishing cover is detachably fixed on the electromagnetic contactor body through a quick-release assembly.

[0018] On the basis of the above scheme and as a preferred scheme of the above scheme: the quick-release assembly includes a clamping part fixed to the electromagnetic contactor body, and a clamping piece connected to the arc-extinguishing cover, the clamping piece has a clamping part bent or protruding toward the clamping part, and after the arc-extinguishing cover is pressed against the upper end surface of the electromagnetic contactor body, the clamping part is clamped to the clamping part; the clamping part is provided with a handle on the side away from the clamping part, and an external force is applied to the handle to separate the clamping part from the clamping part.

[0019] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0020] 1. By setting an auxiliary static contact and an auxiliary moving contact, and the minimum spacing between the auxiliary static contact and the auxiliary moving contact is smaller than the minimum spacing between the static contact and the moving contact, the auxiliary moving contact and the auxiliary static contact are first in contact before the moving contact and the static contact are in contact; after the moving contact and the static contact are separated, the auxiliary moving contact and the auxiliary static contact are separated last, and since the auxiliary static contact and the auxiliary moving contact are closer to the arc extinguishing hood, the arc can be better introduced into the arc extinguishing hood; in addition, the static contact and the moving contact serve as the main working contacts, and after such a setting, the arc mainly occurs on the auxiliary static contact and the auxiliary moving contact, thereby avoiding ablation damage to the static contact and the moving contact, and greatly improving the service life of the electromagnetic contactor.

[0021] 2. The normally closed contact of the first travel switch is connected in parallel with the second coil (holding coil) and then connected in series in the loop of the first coil. Then, at startup, the normally closed contact of the first travel switch will short-circuit the second coil, so that the voltage of the starting power supply is directly loaded on both ends of the first coil. After the moving iron core of the first coil (starting coil) is sucked down to make the moving contact contact with the static contact, the pressure block will press down the contact at the beginning of the first stroke to separate the normally closed contact, so that the second coil is connected in series in the loop of the first coil to achieve the effect of voltage reduction and current limiting, thereby reducing the power of the first coil and reducing its heat generation; and adopts a mechanical switching method with high reliability, low cost, and not easily interfered with, which is more conducive to long-term stable operation in a high-voltage environment.

[0022] 3. The arc extinguishing hood is detachably fixed on the electromagnetic contactor body through a quick-release assembly. Therefore, when the arc extinguishing hood is damaged, the electromagnetic contactor can continue to operate well by quickly replacing the arc extinguishing hood, avoiding the problem of the existing electromagnetic contactor arc extinguishing hood integral design, which is not conducive to maintenance, and the overall replacement of the arc extinguishing hood when there is a problem leads to high maintenance costs.

[0023] 4. The magnetic flux plate of the arc striking assembly is arranged in the main body of the electromagnetic contactor and is located on both sides of the arc extinguishing cover. It adopts a position closer to the moving and static contacts, and the area of ​​the magnetic flux plate is increased, which is more conducive to introducing the arc generated by the moving and static contacts into the arc extinguishing cover, so that the arc can be extinguished quickly, avoiding the problem that the arc extinguishing effect of the electromagnetic contactor in the prior art is poor, resulting in long-term arcing and damaging the electromagnetic contactor and other auxiliary circuits.

[0024] 5. The addition of the first arc-starting plate and the second arc-starting plate further enhances the arc-starting effect, thereby making the arc extinguishing speed faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is another three-dimensional schematic diagram of the overall structure of the present invention;

[0027] Figure 3 It is the overall structural front view of the present invention;

[0028] Figure 4 It is a schematic diagram of the arc striking assembly structure;

[0029] Figure 5 It is a schematic diagram of the internal structure of the present invention;

[0030] Figure 6 It is a three-dimensional schematic diagram of the internal structure of the present invention;

[0031] Figure 7 It is a schematic diagram of the coil attraction control principle of the present invention. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of this application clearer, the technical solution in the embodiment will be clearly and completely described below in conjunction with the drawings in the embodiment. Obviously, the described embodiment is only a part of the embodiment of this application, not all embodiments. Based on the given embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0033] In the description of the present application, it should be understood that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] In the description of this application, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0035] Combination Figure 1-5 , an electromagnetic contactor for electric locomotive, comprising an electromagnetic contactor body 10; a contact assembly 20, located in the electromagnetic contactor body 10, comprising a moving contact 22 and a static contact 21; and further comprising

[0036] The contact pull-in assembly 30 includes a first coil 31, a second coil 32 and a moving assembly 33, wherein the moving assembly includes a moving iron core 331, a swing arm 332, a compression spring (not shown in the accompanying drawings, 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 is located at one end of the first coil 31, one end of the moving iron core 331 enters the first coil 31, and the other end 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 connector 11 of the electromagnetic contactor body 10, and the other end is hinged to the contact fixing seat 334; a horizontal track 336 is fixedly provided on the electromagnetic contactor body 10, and the contact fixing seat 334 is slidably installed on the horizontal track 336, so that the contact fixing seat 334 can slide horizontally along the horizontal track 336 while the swing arm 332 swings, and the moving contact 3 31 is connected to the contact fixing seat 334; when the first coil 31 is energized to make the moving iron core 331 overcome the elastic force of the compression spring and move further into the first coil 31, the swing arm 332 can be pulled to swing in the direction of the first coil 31, thereby driving the contact fixing seat 334 and the moving contact 22 to move in the direction of the static contact 21, so that the moving contact 22 contacts the static contact 21, thereby connecting the line; the compression spring keeps applying a tendency force to the moving iron core 331, and the tendency force can make the moving iron core 331 move toward the outside of the first coil 31. Specifically, when the first coil is de-energized, the attraction of the first coil disappears, and the elastic force of the compression spring directly acts on the moving iron core 331 as the dominant force, thereby moving the moving iron core toward the outside of the first coil, and then at the same time drives the swing arm to swing away from the first coil, thereby driving the contact fixing seat and the moving contact to move toward the initial position, thereby separating the static contact from the moving contact, and disconnecting the line. Preferably, in this embodiment, the first coil and the second coil are coaxial windings, the second coil is the outermost coil, and the size of the outermost coil assembly is: 150 (length) * 90 (diameter). Under the premise of meeting the use requirements, the weight of the whole machine is reduced compared with the coil size of 150 (length) * 100 (diameter) of the existing electromagnetic contactor; on the other hand, the reduced outer size of the coil can make the side panel unnecessary to hollow out, thereby increasing the bearing capacity of the side panel and preventing it from being broken due to subsequent long-term use.

[0037] In order to simplify the process and reduce the difficulty of product production, the swing arm in this embodiment preferably includes a first swing arm 3321 and a second swing arm 3322 symmetrically arranged on both sides of the moving iron core, the first swing arm 3321 and the second swing arm 3322 are both straight, one end of the moving iron core 31 is respectively hinged to the middle of the first swing arm 3321 and the second swing arm 3322, the same end of the first swing arm 3321 and the second swing arm 3322 is hinged to the electromagnetic contactor body 10, and the other end of the two is hinged to the contact fixing seat 334. After such a setting, the movement of the contact suction assembly can be made more stable, the stability is greatly improved, and the process is simplified, and the difficulty of product production is reduced.

[0038] Furthermore, it also includes an auxiliary contact 23, which includes an auxiliary static contact 231 and an auxiliary moving contact 232. The auxiliary moving contact 232 is connected to the contact fixing seat 334 through a compensation component 27, and the minimum distance between the auxiliary static contact 231 and the auxiliary moving contact 232 is smaller than the minimum distance between the static contact 21 and the moving 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 arranged at the front end of the movable seat 271, the lower part of the front end of the movable seat 271 is hinged to the connecting seat 273, and a spring 272 is arranged between the lower part of the rear end of the movable seat 271 and the connecting seat 273; the upper end of the spring 272 contacts the lower part of the rear end of the movable seat 271, and the lower end contacts the upper end of the connecting seat 273; since the minimum spacing between the auxiliary static contact 231 and the auxiliary moving contact 232 is smaller than the minimum spacing between the static contact 21 and the moving contact 22, after the auxiliary moving contact contacts the auxiliary static contact, the contact fixing seat will move further until the static contact contacts the moving contact 22, at which time the auxiliary moving contact 2 32 will absorb the excessive contact displacement by compressing the spring 272 through the rotation of the movable seat 271, that is, when the static contact and the moving contact are attracted, the auxiliary moving contact and the auxiliary static contact are attracted first; when the static contact and the moving contact are disconnected, since the minimum spacing between the auxiliary static contact 231 and the auxiliary moving contact 232 is smaller than the minimum spacing between the static contact 21 and the moving contact 22, the static contact and the moving contact are separated first, and then the spring 272 begins to stretch from compression, thereby driving the movable seat 271 to rotate toward the auxiliary static contact, thereby compensating for the displacement of the contact fixing seat, until the static contact and the moving contact are completely separated by a sufficient distance and reach the limit of spring compensation, at which time the auxiliary static contact and the auxiliary moving contact are separated. By setting an auxiliary static contact and an auxiliary moving contact, and the minimum spacing between the auxiliary static contact and the auxiliary moving contact is smaller than the minimum spacing between the static contact and the moving contact, the auxiliary moving contact and the auxiliary static contact are first contacted before the moving contact and the static contact are contacted; after the moving contact and the static contact are separated, the auxiliary moving contact and the auxiliary static contact are separated last, and since the auxiliary static contact and the auxiliary moving contact are closer to the arc extinguishing hood, the arc can be better introduced into the arc extinguishing hood; in addition, the static contact and the moving contact serve as the main working contacts, and after such a setting, the arc mainly occurs on the auxiliary static contact and the auxiliary moving contact, thereby avoiding ablation damage to the static contact and the moving contact, and greatly improving the service life of the electromagnetic contactor.

[0039] It also includes a static contact lead-out terminal 241, a moving contact lead-out terminal 242 and a moving contact position adjustment component 28. The moving contact lead-out terminal 241 is connected to the moving contact 22 and the auxiliary moving contact 232 respectively through a first flexible conductor 251 and a second flexible conductor 252; the moving contact position adjustment component 28 includes an adjusting screw 281, an adjusting block 282 and a buffer compression 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 threadedly connected to the adjusting block 282, and the moving contact is fixedly connected to the adjusting block 282; the buffer compression spring 283 is sleeved on the outside of the adjusting screw 281, and one end contacts the adjusting block 282 and the other end contacts the side wall of the moving contact accommodating cavity. The adjusting screw 281 is clearance-matched with the side wall of the moving contact accommodating cavity. Then, by rotating the adjusting screw 281 in the forward or reverse direction, the movable contact of the adjusting block can be moved closer to or farther away from the static contact, thereby facilitating the adjustment of the movable stroke required for the movable contact to contact the static contact.

[0040] The coil pull-in control component includes 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 energized to drive the moving contact 22 to contact the static contact 21, the trigger component 337 triggers the first travel switch 51 to connect the second coil 32 in series with the circuit of the first coil 31; specifically, the trigger component 337 includes a first connecting member 3371, a second connecting member 3372, a driving swing arm 3373 and a rotating shaft 3374 fixedly mounted on the contact fixing seat 334; the first connecting member 3371 is vertically arranged, one end of which is fixedly connected to the contact fixing seat 334, and the other end of which is fixedly connected to the contact fixing seat 334. One end of the second connecting member 3372 is hinged, and the other end of the second connecting member 3372 is hinged to one end of the driving swing arm 3373. The driving swing arm 3373 is fixedly connected to the rotating shaft 3374, and the peripheral surface of the rotating shaft 3374 has a protruding trigger block 33741; when the contact fixing seat 334 moves toward the direction where the static contact is located, the first connecting member 3371, the second connecting member 3372 and the driving swing arm 3373 drive the rotating shaft 3374 to rotate, so that the trigger block 33741 rotates counterclockwise toward the position where the contact 511 of the first travel switch 51 is located, thereby squeezing the contact 511 to trigger the first travel switch 51. Figure 7The first coil 31 and the second coil 32 are separated and arranged side by side, which is beneficial to the heat dissipation of the coils; the normally closed contact SQ1 of the first travel switch is connected in parallel with the second coil 32 and then connected in series in the loop of the first coil 31. Then, at startup, the normally closed contact of the first travel switch will short-circuit the second coil, so that the voltage of the starting power supply is directly loaded on both ends of the first coil. After the moving iron core of the first coil (starting coil) is sucked down to make the moving contact contact with the static contact, the trigger block 33741 will press down the contact at the beginning of the first stroke to separate the normally closed contact, thereby realizing the second coil being connected in series in the loop of the first coil, thereby realizing the effect of voltage reduction and current limiting.

[0041] It is further preferred that the second travel switch 52 is also included, and the trigger assembly can synchronously trigger the first travel switch and the second travel switch; specifically, two trigger blocks 33741 are arranged side by side on the rotating shaft 3374, and each trigger block 33741 corresponds to the first travel switch and the second travel switch respectively, so that when the moving iron core 331 is attracted by the first coil 31 and moves into the first coil or moves out of the first coil under the action of the 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 contact down or away from the release contact, so as to connect or disconnect the contacts inside the first travel switch 51 and the second travel switch. It should be noted that the second travel switch 52 is used to connect with the communication interface 53, and after the moving contact and the static contact are closed to the specified position, the contact inside the second travel switch 52 is triggered, thereby satisfying the transmission of the signal, and then the signal can be fed back to the external control system through the communication interface 53.

[0042] Arc extinguishing assembly, specifically, the arc extinguishing assembly 40 includes an arc extinguishing cover 41, and the arc extinguishing cover 41 is arranged outside the moving contact 22 and the static contact 21. The arc extinguishing assembly 40 also includes an arc striking assembly 42, and the arc striking assembly 42 includes an arc striking coil 421 and a magnetic flux plate 422 symmetrically arranged on both sides of the contact assembly 20, a magnetic conductive column 4211 is penetrated in the middle of the arc striking coil 421, and the magnetic flux plate 422 is respectively in contact with the two end surfaces of the magnetic conductive column 4211, and the magnetic flux plate 422 is located in the electromagnetic contactor body 10 and is attached to the outer surface of the arc extinguishing cover 41. Preferably, the wire diameter of the arc striking coil 421 is increased from φ1.8 to φ2.0 to increase the magnetic flux, and the magnetic flux plate is further extended to the top and bottom of the contact assembly, for example, it is increased to 50mm on the basis of the existing magnetic flux plate, so that the arc is easier to be drawn into the arc extinguishing cover, solving the problem that the existing electromagnetic contactor cannot normally draw an arc or the arc drawing is unstable.

[0043] Further preferably, it also includes a first arc-starting plate 451 and a second arc-starting plate 452; the first arc-starting plate 451 is located above the moving contact 22, and the front end is close to the moving contact 22, and the rear end extends into the arc-extinguishing cover 41; the second arc-starting plate 452 is located above the static contact 21, and the front end is close to the static contact 21, and the rear end extends into the arc-extinguishing cover 41. The addition of the first arc-starting plate and the second arc-starting plate further enhances the arc-starting effect, thereby making the arc extinguishing speed faster. Preferably, it also includes an arc-starting coil protection plate 453, which prevents the arc from burning the arc-starting coil. Preferably, the arc-starting coil is half-wrapped with a glass ribbon, and the outside of the arc-starting coil is covered with an epoxy tube to increase protection and prevent the outside from damaging the coil and affecting its performance.

[0044] After the arc extinguishing hood has been used for a period of time, there will be obvious damage to the arc extinguishing hood where the arc is more concentrated, thereby affecting the arc extinguishing effect. However, at this time, other components inside the electromagnetic contactor are still intact and have not reached their service life. In this case, if the entire machine is replaced directly, the cost will be too high, but there will be risks in continuing to use it. For this reason, the present application further prefers that the arc extinguishing hood 41 is detachably fixed to the electromagnetic contactor body 10 through a quick-release assembly 46. Specifically, the quick-release assembly 46 includes a clamping portion 462 fixed to the electromagnetic contactor body 10, and a clamping piece 461 connected to the arc-extinguishing cover 41, the clamping piece 461 has a clamping portion 4611 bent or protruding 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 to the clamping portion 462; the clamping portion 4611 is provided with a handle 46111 on the side away from the clamping portion 462, and an external force is applied to the handle 46111 to separate the clamping portion 4611 from the clamping portion 462. It also includes a support column 463, the clamping piece 461 rotates around the support column 463, and the upper end 4612 of the clamping piece 461 abuts against the outer shell of the arc extinguishing cover 41, so that when the clamping part 4611 clamps the clamping part 462, a trend force is generated due to the elastic deformation of the clamping piece 461, and the trend force clamps the clamping part 4611 to the clamping part 462. The arc extinguishing cover 41 is detachably fixed to the electromagnetic contactor body through a quick-release component 46, so when the arc extinguishing cover 41 is damaged, the electromagnetic contactor can continue to operate well by quickly replacing the arc extinguishing cover, avoiding the problem of the existing electromagnetic contactor arc extinguishing cover integral design, which is not conducive to maintenance, and the arc extinguishing cover has problems and the overall replacement leads to high maintenance costs.

[0045] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electromagnetic contactor for electric locomotive, comprising an electromagnetic contactor body; a contact assembly, located in the electromagnetic contactor body, comprising a moving contact and a static contact; characterized in that: Also includes A contact pull-in assembly comprises a first coil, a second coil and a moving assembly, wherein the moving assembly comprises a moving iron core, a swing arm, a compression spring and a contact fixing seat, wherein the first coil is arranged horizontally, the moving iron core is arranged coaxially with the first coil and is located at one end of the first coil, one end of the moving iron core enters the first coil, and the other end is hinged to the middle part of the swing arm, one end of the swing arm is hinged to the electromagnetic contactor body, and the other end is hinged to the contact fixing seat, the contact fixing seat can slide in the horizontal direction, and the moving contact is connected to the contact fixing seat; when the first coil is energized to make the moving iron core move further into the first coil, the contact fixing seat can be driven to slide in the same direction, so that the moving contact contacts the static contact; the compression spring keeps applying a tendency force to the moving iron core, and the tendency force can make the moving iron core move to the outside of the first coil; A coil closing control component, comprising a first travel switch and a trigger component; The trigger component is linked with the contact fixing seat. When the first coil is energized to drive the moving contact to contact the static contact, the trigger component triggers the first travel switch to connect the second coil in series with the loop of the first coil. The normally closed contact of the first travel switch is connected in parallel with the second coil and then connected in series with the loop of the first coil. An arc extinguishing assembly, the arc extinguishing assembly comprising an arc extinguishing cover, the arc extinguishing cover being arranged outside the moving contact and the static contact; Auxiliary contacts, the auxiliary contacts comprising auxiliary static contacts and auxiliary moving contacts, the auxiliary moving contacts being connected to the contact fixing seat via a compensation component, the minimum spacing between the auxiliary static contacts and the auxiliary moving contacts being smaller than the minimum spacing between the static contacts and the moving contacts; The arc extinguishing assembly also includes an arc striking assembly, which includes an arc striking coil and magnetic flux plates symmetrically arranged on both sides of the contact assembly, a magnetic conductive column is passed through the middle of the arc striking coil, and the magnetic flux plates are respectively in contact with the two end surfaces of the magnetic conductive column, and the magnetic flux plates are located in the electromagnetic contactor body and are attached to the outer surface of the arc extinguishing cover; a first arc-striking plate and a second arc-striking plate; the first arc-striking plate is located above the moving contact, with its front end close to the moving contact and its rear end extending into the arc-extinguishing cover; the second arc-striking plate is located above the static contact, with its front end close to the static contact and its rear end extending into the arc-extinguishing cover.

2. The electromagnetic contactor for electric locomotive according to claim 1, characterized in that: It also includes a second travel switch, and the trigger component can synchronously trigger the first travel switch and the second travel switch.

3. The electromagnetic contactor for electric locomotive according to claim 1, characterized in that: It also includes a moving contact lead-out terminal and a moving contact position adjustment component, the moving contact lead-out terminal is connected to the moving contact and the auxiliary moving contact respectively through a first flexible conductor and a second flexible conductor; the moving contact position adjustment component includes an adjusting screw and a buffer compression spring, the contact fixing seat is hollow to form a moving contact accommodating chamber, the adjusting screw is inserted into the moving contact accommodating chamber from the outside of the accommodating chamber and is threadedly connected to the moving contact; the buffer compression spring is sleeved on the outside of the adjusting screw, and one end contacts the moving contact and the other end contacts the side wall of the accommodating chamber, and the adjusting screw is clearance-matched with the side wall of the accommodating chamber.

4. The electromagnetic contactor for electric locomotive according to claim 1, characterized in that: The swing arm includes a first swing arm and a second swing arm symmetrically arranged on both sides of the moving iron core, the first swing arm and the second swing arm are both straight, one end of the moving iron core is hinged to the middle of the first swing arm and the second swing arm respectively, the same end of the first swing arm and the second swing arm is hinged to the electromagnetic contactor body, and the other ends of the two are hinged to the contact fixing seat.

5. The electromagnetic contactor for electric locomotive according to claim 1, characterized in that: The arc extinguishing cover is detachably fixed on the electromagnetic contactor body through a quick-release assembly.

6. The electromagnetic contactor for electric locomotive according to claim 5, characterized in that: The quick-release assembly includes a clamping portion fixed to the electromagnetic contactor body, and a clamping piece connected to the arc-extinguishing cover, wherein the clamping piece has a clamping portion bent or protruding toward the clamping portion, and after the arc-extinguishing cover is pressed against the upper end surface of the electromagnetic contactor body, the clamping portion is clamped to the clamping portion; the clamping portion is provided with a handle on the side away from the clamping portion, and an external force is applied to the handle to separate the clamping portion from the clamping portion.

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