CN213483585U

CN213483585U - Microswitch for vacuum main circuit breaker of electric locomotive

Info

Publication number: CN213483585U
Application number: CN202022697390.6U
Authority: CN
Inventors: 曾前
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2021-06-18
Anticipated expiration: 2030-11-20

Abstract

The utility model discloses an electric locomotive vacuum is micro-gap switch for main circuit breaker, include: the device comprises a roller component, a shell and a pre-tightening spring, wherein a copper base, a moving contact and a static contact are mounted on a base at the bottom of the shell, the copper base is fixed inside the shell, a static contact is welded on the copper base, a moving contact is welded on an upper conducting sheet and a lower conducting sheet, a sliding rod is arranged at the center of the shell and is arranged on the shell, the upper section of the sliding rod is limited by a position C on the shell, the lower section of the sliding rod is limited by a position D on the shell and slides up and down, the pre-tightening spring is sleeved on the sliding rod and is connected with the sliding rod through a flat spring, one end of the flat spring is inserted into a sliding rod groove, the other end of the flat spring is inserted. The sliding rod controls the connection and the disconnection of the brake and the static contact, the strength and the rigidity are improved, the movement of the parts is stable, the contacts are separated and contacted simultaneously, and the arc discharge is small; the parts are not blocked, the contacts are not adhered, and the locomotive runs safely.

Description

Microswitch for vacuum main circuit breaker of electric locomotive

Technical Field

The utility model relates to a micro-gap switch application among the electric control circuit, concretely relates to micro-gap switch for electric locomotive vacuum main circuit breaker.

Background

Two groups of micro switches on the vacuum main circuit breaker of the electric locomotive are used for controlling the pantograph lifting and pantograph lowering of the locomotive pantograph, the two groups of micro switches drive the up-and-down movement of the cam block by the reciprocating motion of a cylinder piston rod, and the up-and-down movement of the cam block pushes the roller component of the switch so as to realize the opening and closing of the micro switches. Because the moving speed of the piston rod of the cylinder is very high, the cam block can provide a very large high-speed impact force for the microswitch when contacting with the microswitch roller. The microswitch selected for use in the initial design of the main vacuum circuit breaker of various harmonious series electric locomotives has the model S826, the microswitch drives a leaf spring to turn over by using a trapezoidal block in the movement process to control the connection and disconnection of a moving contact and a static contact, the trapezoidal block on the microswitch of the S826 is a hollow irregular part, and corners are sharp-angled transitions, so that the structure has poor strength and rigidity; when the trapezoidal block cracks, the leaf spring or the spring is separated from the spring seat hole, the copper shifting fork is dislocated and other faults occur, and the microswitch is switched on and off, the railway field technicians cannot judge the fault source through naked eyes, and serious hidden trouble of locomotive operation is brought.

Disclosure of Invention

The utility model aims to solve the technical problem that it is not enough to overcome prior art, provide an electric locomotive vacuum micro-gap switch for main circuit breaker. The strength and rigidity of the microswitch are greatly improved in the process of controlling the on and off movement of the moving contact and the static contact; other parts in the switch move stably and symmetrically, the left moving contact and the right moving contact are separated and contacted, and the arc between the contacts is small; the moving parts in the switch can not be blocked, and the contact can not be switched on and off, thereby ensuring the operation safety of the locomotive.

In order to solve the technical problems, the invention adopts the following technical scheme: this electric locomotive vacuum main circuit breaker micro-gap switch includes: the device comprises a roller component, a shell, a copper base, a moving contact and a static contact and a pre-tightening spring, wherein the pre-tightening spring is arranged on a base at the bottom of the shell, the copper base is fixed in the shell, a normally open end fixed contact is welded on the normally open end copper base, a normally closed end fixed contact is welded on the normally closed end copper base, an upper group of moving contacts and a lower group of moving contacts are welded on an upper conducting sheet and a lower conducting sheet, the middle of the upper conducting sheet and the lower conducting sheet are separated (insulated) by a partition, 2 upper moving contacts are communicated by an upper conducting sheet, 2 lower moving contacts are communicated by a lower conducting sheet, a sliding rod is arranged at the center of the shell, the sliding rod is arranged on the shell, the upper section of the sliding rod is limited by a boss plane at a position C on the shell, the lower section of the sliding rod is limited by a boss plane at a position D on the shell and can, the spacer is connected with the slide bar through the leaf spring, one end of the leaf spring is inserted into an open slot at the middle part of the slide bar, the other end of the leaf spring is inserted into a central slot of the spacer, and the slide bar moves up and down through the leaf spring, the spacer and the conducting sheet to drive the upper and lower moving contacts to move up and down.

The shell at the lower part of the conducting sheet is provided with a left semicircular groove and a right semicircular groove, auxiliary semicircles are installed in the left semicircular groove and the right semicircular groove, the auxiliary semicircles can rotate in the semicircular grooves, the slide bar moves to the lowest end position, the boss plane at the D position on the slide bar extrudes one end of the auxiliary semicircles to enable the auxiliary semicircles to rotate around the circle center of the auxiliary semicircles, the other end of the auxiliary semicircles jacks the conducting sheet, the lower moving contact and the fixed contact at the normally closed end can be forcibly opened, and the contacts.

The microswitch (T2125 b) of the present invention has solid long rod sliding rod to replace S826 short hollow trapezoidal block, and the guide stroke of the sliding rod is much longer than that of the trapezoidal block. The roller component rotates anticlockwise and is limited by a boss plane at the position E and two boss planes of C, D on the shell, so that the sliding rod overturns a spring with a driving plate to control the moving contact to be connected with a normally closed static contact and to be closed, the strength and the rigidity are greatly improved, other components in the switch move stably and symmetrically, the left moving contact and the right moving contact are almost separated and contacted at the same time, and the arc between the contacts is very small; moving parts in the switch cannot be stuck, moving and static contacts cannot be adhered, the contacts cannot be switched on and off, the strength and rigidity of the whole T2125b micro switch and the movement stability of each part are many times higher than those of an S826 switch, the theoretical life is prolonged by one order of magnitude, and the operation safety of a locomotive is ensured.

The present invention will be further explained with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic view of the microswitch

FIG. 2 is a schematic view of the structure of the slide bar of the microswitch

FIG. 3 is a schematic diagram of a trapezoidal block structure on the S826 microswitch

FIG. 4 is a schematic view of the structure of the micro switch for assisting the lifting of the moving contact and the fixed contact of the semi-circle end of the conducting sheet

Detailed Description

Referring to fig. 1-4, the electric locomotive vacuum main circuit breaker microswitch comprises: the roller component 1, the shell 12, the first copper base 10, the second copper base 14, the moving contact, the static contact, the pre-tightening spring 11 is installed on the base at the bottom of the shell 12, the first copper base 10, the second copper base 14 are fixed inside the shell 12, the normally open end static contact 4 is welded on the normally open end second copper base 14, the normally closed end static contact group 8 is welded on the normally closed end first copper base 10, the upper moving contact group 5, the lower moving contact group 7 are welded on the upper and lower conducting sheets 3, the middle of the upper and lower conducting sheets is separated (insulated) by a separating

piece

13, 2 upper moving contacts are communicated by the upper conducting

sheet

3, 2 lower moving contacts are communicated by the lower conducting sheet 3, the center of the shell 12 is provided with the sliding rod 2, the sliding rod 2 is installed on the shell 12, the upper section 15 of the sliding rod 2 is limited by the plane boss at the position C on the shell 12, the lower section 16 of the sliding rod 2 is limited by the plane boss at the position D, can slide up and down, the upper end of the slide rod 2 is contacted with the roller component 1, and the roller component rotates anticlockwise and is limited by a boss plane at the E position on the shell 12. The pre-tightening spring 11 is sleeved on the sliding rod 2, the separating piece 13 is connected with the sliding rod 2 through the leaf spring 6, one end of the leaf spring 6 is inserted into an open slot in the middle of the sliding rod 2, the other end of the leaf spring is inserted into a central slot of the separating piece 13, and the up-down movement of the sliding rod 2 can drive the upper moving contact set 5 and the lower moving contact set 7 to move up and down through the leaf spring 6, the separating piece 13 and the conducting piece 3.

The shell at the lower part of the conducting sheet 3 is provided with a left semicircular groove 18 and a right semicircular groove 18, an auxiliary semicircle 9 is arranged in the left semicircular groove 18 and the right semicircular groove 18, the auxiliary semicircle 9 can rotate in the semicircular grooves, the slide bar 2 moves to the lowest end position, the boss plane at the D part on the slide bar 2 extrudes one end of the auxiliary semicircle 9, the auxiliary semicircle 9 rotates around the center of the circle, the other end 17 of the auxiliary semicircle 9 jacks the conducting sheet 3, the lower movable contact group 7 and the normally closed end static contact 8 can be forcibly opened, and the

contact groups

7 and 8 are prevented from being welded together when the power-on heat is overlarge.

The magnetic blocks are arranged on the outer surface of the shell 12 and at the positions of the moving contact and the static contact, and can play a role in sweeping electric arcs so as to reduce the damage of the electric arcs in the circuit to the micro switch.

When the roller is acted by an external force F, the roller assembly 1 rotates downwards around the fixed shaft of the roller assembly and pushes the sliding rod 2 to move downwards, when the moving position of the sliding rod 2 just passes through the horizontal positions of the two ends of the leaf spring 6 and then moves downwards, the elastic force of the turned leaf spring 6 acts on the central groove of the separating part 13 and provides an upward elastic force to drive the separating part 13 to move upwards in an accelerated way, the upper movable contact group 5 and the lower movable contact group 7 also move upwards in an accelerated way, so that the

contact groups

7 and 8 which are contacted in an initial state are separated and separated rapidly, the

contact groups

4 and 5 which are separated in the initial state are closed rapidly, and at the moment, the normally-open end circuit is connected; when the external force F is removed, the compressed pre-tightening spring 11 provides an upward force for the sliding rod 2, when the sliding rod 2 moves upwards to the horizontal positions at the two ends of the leaf spring 6 and then moves upwards, the leaf spring 6 turns over and applies a downward elastic force to the separating piece 13 to drive the separating piece 13 to move downwards, under the combined action of the leaf spring 6 and the pre-tightening spring 11, the

contact groups

4 and 5 are rapidly separated, the

contact groups

7 and 8 are rapidly closed, and at the moment, the normally closed end circuit is connected. In the whole process, the switch acts rapidly, the return is normal, the switch contact is disconnected, the time is short, the contact is not easy to damage, and the circuit stable control is realized.

The microswitch model S826 is selected when the harmonious series various electric locomotive vacuum main circuit breakers are initially designed, the trapezoid blocks on the microswitch S826 are special-shaped plastic pieces with hollow interiors (see figure 3), and corners are in sharp corner transition, so that the structure is poor in strength and rigidity, and a new microswitch T2125b is developed aiming at the defects of the microswitch S826, the reliability is greatly improved compared with that of the microswitch S826, and the theoretical service life is prolonged by one order of magnitude. The microswitch T2125b of the invention uses a solid long rod slide rod 2 to replace a hollow trapezoid block with a short S826, and the guide stroke of the slide rod 2 is much longer than that of the trapezoid block, the upper section 15 of the slide rod 2 is limited by a boss plane at the C position on the shell 12, the lower section 16 of the slide rod 2 is limited by a boss plane at the D position on the shell 12, and the slide rod can slide up and down. The roller assembly is limited by the boss plane at E on the housing 12 in the counterclockwise rotation. The plane of the bosses at the two positions of the component C, D is limited, so that the slide bar 2 overturns to control the

movable contact groups

5 and 7 to be connected with the

static contacts

4 and 8 and to be disconnected, other components in the switch move stably and symmetrically, the left and right

movable contact groups

5 and 7 are almost separated from and contacted with the

static contacts

4 and 8 at the same time, the arc between the movable contact and the static contacts is very small, and the strength, the rigidity and the motion stability of each component of the whole switch are higher by one order of magnitude than those of the S826 switch.

The microswitch T2125b has the same action process, the same wiring mode and the same installation size as the S826 microswitch, and the reliability of the microswitch T2125b which is replaced by the S826 microswitch is greatly improved.

On a test bed for simulating the working condition of the vacuum main circuit breaker, the same impact action (impact air pressure: 4.0-4.5 Kg/cm) is used²(ii) a Impact velocity: about 1.4 m/s; impact frequency: about 1/S) were tested separately for destructive comparison of the S826 microswitch and the newly developed microswitch T2125b, the test results showing that the impact life of the microswitch T2125b of the invention is an order of magnitude higher than that of the S826 microswitch.

Tests prove that the maximum trigger speed which can be borne by the microswitch T2125b is 3m/s, and the microswitch is suitable for being used under the condition that the trigger speed is greater than 1 m/s.

The S826 micro-switch is replaced by the T2125b micro-switch, from 5 months in 2017, a customer uses 8000 micro-switches T2125b to replace the S826 micro-switch to be respectively installed on an HXD1C type electric locomotive BVAC N99D vacuum main breaker, an HXD1D type locomotive TDV10(01) vacuum main breaker and an HXD3C type electric locomotive 22CBDP1 vacuum main breaker, the quality is stable and reliable when the micro-switch is used up to now, no moving part clamping stagnation occurs in the switch, any quality problems such as contact disconnection and contact connection are solved, and the stability of train operation is ensured.

Claims

1. A micro switch for a vacuum main breaker of an electric locomotive comprises: wheel components (1), casing (12), first copper base (10), second copper base (14), sound contact, pretension spring (11) are installed on casing (12) bottom base, first copper base (10), second copper base (14) are fixed inside casing (12), normally open end static contact (4) welding is on normally open end second copper base (14), normally closed end static contact (8) welding is on normally closed end first copper base (10), go up movable contact group (5), lower movable contact group (7) welding is on two upper and lower conducting pieces (3), two upper and lower conducting pieces (3) are middle to be separated by separator (13), 2 go up the movable contact and switch on by upper portion conducting piece (3), 2 lower movable contact switches on by lower part conducting piece (3), characterized by: the center of the shell (12) is provided with a sliding rod (2), the sliding rod (2) is arranged on the shell (12), the upper section (15) of the sliding rod (2) is limited by a boss plane at the C position on the shell (12), the lower section (16) of the sliding rod (2) is limited by a boss plane at the D position on the shell (12) and can slide up and down, the top end of the sliding rod (2) is contacted with a roller component (1), the roller component rotates anticlockwise and is limited by a boss plane at the E position on the shell (12), a pre-tightening spring (11) is sleeved on the sliding rod (2), a separating component (13) is connected with the sliding rod (2) through a leaf spring (6), one end of the leaf spring (6) is inserted into the middle part of the sliding rod (2), the other end of the leaf spring is inserted into a central groove of the separating component (13), the up-down movement of the sliding rod (2) can drive an upper movable contact head group (5, The lower moving contact group (7) moves up and down.

2. The micro switch for the main vacuum circuit breaker of the electric locomotive as claimed in claim 1, wherein: be equipped with two left and right half-round grooves (18) on the casing of conducting plate (3) lower part, install supplementary semicircle (9) in two left and right half-round grooves (18), supplementary semicircle (9) can be at half-round groove (18) internal rotation, slide bar (2) are moving to the bottom position in-process, D department boss plane extrusion supplementary semicircle (9) one end on slide bar (2), make supplementary semicircle (9) be rotary motion around its centre of a circle, supplementary semicircle (9) other end (17) jacking conducting plate (3), open lower movable contact group (7) and normally closed end static contact (8).