CN111098713B

CN111098713B - Multi-roller rotating pantograph head and bipolar rigid suspension bus composite system

Info

Publication number: CN111098713B
Application number: CN201911273136.9A
Authority: CN
Inventors: 肖嵩; 叶智宗; 李玉航; 童梦园; 赖新安; 孟举; 饶阳; 吴广宁; 高国强; 魏文赋; 杨泽锋
Original assignee: Southwest Jiaotong University
Current assignee: Southwest Jiaotong University
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2020-12-18
Anticipated expiration: 2039-12-12
Also published as: CN111098713A

Abstract

The invention discloses a multi-roller rotating pantograph head and bipolar rigid suspension busbar composite system, which comprises a plurality of roller modules, a rotating motor fixed on a rotating motor bracket, and a power supply bar and a return bar which are arranged above the roller modules in parallel and horizontally; the roller modules are radially fixed on a roller connecting shaft through a roller module bracket and an insulating bracket, and the roller connecting shaft is arranged at the output end of the rotating motor; a roller sliding plate connecting shaft is connected below the roller module bracket, and an arc-shaped sliding plate is arranged on the outer side of the bottom end of the roller sliding plate connecting shaft; the roller is in rolling contact with the bottom surface of the power supply row or the backflow row independently; all be equipped with a plurality of arc carbon block on power supply support and the backward flow support, arc slide independent and power supply support or the arc carbon block sliding contact on the backward flow support. The invention avoids the stray current phenomenon generated by the reflux of traction current through the train steel rail, reduces the maintenance cost of the subway, and prolongs the service life of the peripheral buried metal pipeline and the civil engineering structural steel bar.

Description

Multi-roller rotating pantograph head and bipolar rigid suspension bus composite system

Technical Field

The invention relates to the technical field of electrified rail transit, in particular to a multi-roller rotating pantograph head and bipolar rigid suspension bus bar composite system.

Background

With the continuous development of the electrified rail transit system in China, the method not only puts higher requirements on the stability of a current receiving system, but also puts challenges on the reliability of an electrified railway grounding system. At present, urban rail transit in China generally adopts direct-current traction power supply, electric energy is obtained from a traction power supply system through a vehicle-mounted current receiving device, a train is driven to normally run, and traction current flows back to a traction substation through a train steel rail. Since the train rail is not completely insulated from the ground, the traction return current flowing through the train rail leaks to the ground, thereby generating stray current. Stray current easily causes corrosion of a grounding grid, easily invades a power transmission line of a power grid, influences power transmission quality and even causes magnetic biasing of a transformer substation. Compared with stray current generated by an alternating current power supply system, a direct current power supply system adopted by the subway easily causes electrochemical corrosion on train steel rails, track bed steel bars and civil structure steel bars, and the safety and the service life of a civil structure of the subway are influenced. Under the action of a complex environment, stray current can be continuously increased, the influence on a nearby alternating current transmission system can be caused, and a transformer iron core can generate direct current magnetic bias to seriously influence the transmission performance and quality.

In addition, because the subway working grounding system and the protection grounding system are both connected with the train steel rail, when the train runs, because the resistance of the train steel rail is different from the resistance of a train body loop, the traction return current of the working grounding can flow back to the train body through the protection grounding system to generate rail return current. When the vehicle rail reflows to cause the potential of the vehicle body to rise, logic disorder of a vehicle-mounted control and communication system can be caused, and the normal operation of the vehicle-mounted weak current equipment is directly influenced.

In order to avoid the harm of stray current, a four-rail power supply system specially provided with a return rail is researched abroad, namely, a substation supplies power through a third rail and returns through a fourth rail, so that the reason of the generation of the stray current is fundamentally solved, but the method has higher cost.

The existing grounding system comprises working grounding and protective grounding, wherein the working grounding is to flow the working current of the train back to a traction substation through a train steel rail; the protection grounding is to connect the train body and the vehicle-mounted electrical equipment with the train steel rail and to flow the induced current of the train or the leakage current of the vehicle-mounted electrical equipment to the train steel rail. Because the current path can be formed through the train steel rail to the work ground system and the protection ground system that have now, produce the rail backward flow phenomenon, can influence the operation of on-vehicle weak current equipment when serious, threaten the normal operating of train.

At present, in order to inhibit rail backflow and reduce the current component flowing into the train body through the train rail, an isolation resistor is usually added between the train body and the grounding carbon brush, so that the equivalent resistance of the train body is increased, and the rail backflow component can be reduced. However, the method has obvious defects that when the vehicle body is subjected to overvoltage impact, the grounding switch is closed, so that transient impact current is loaded on the grounding resistor, the voltage of the vehicle body is raised instantly, and the vehicle body is a common reference ground of vehicle-mounted weak current equipment, so that the vehicle-mounted control, communication and other weak current equipment can be damaged when the impact voltage is serious.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a compound system of a multi-roller rotating pantograph bow and a bipolar rigid suspension busbar, wherein the parallel arrangement of the bipolar rigid busbar and the multi-roller rotating pantograph bow synchronously realizes the functions of a "power supply-grounding" system, can effectively solve the problems of stray current and rail backflow, and ensures safe and reliable operation of a train. The technical scheme is as follows:

a multi-roller rotating pantograph head and bipolar rigid suspension busbar composite system comprises a plurality of roller modules, a rotating motor fixed on a rotating motor bracket, and a power supply bar and a return bar which are arranged above the roller modules in parallel and horizontally; the roller modules are radially fixed on a roller connecting shaft sequentially through a roller module bracket and an insulating bracket, and the roller connecting shaft is vertically arranged at the output end of the rotating motor; a vertical roller sliding plate connecting shaft is fixedly connected below the roller module bracket, and an arc-shaped sliding plate is arranged on the outer side of the bottom end of the roller sliding plate connecting shaft; the roller with at least one roller module is in rolling contact with the bottom surface of the power supply row or the backflow row; the power supply support and the backflow support are both provided with a plurality of arc-shaped carbon sliding blocks, and at least one arc-shaped sliding plate is in sliding contact with the arc-shaped carbon sliding blocks on the power supply support or the backflow support independently.

Furthermore, the roller modules comprise rollers and roller connectors, a plurality of rollers are arranged on the roller connectors through horizontal roller rotating shafts, the rollers of all the roller modules are positioned on the same circumference, and the axis of the roller connecting shaft penetrates through the circle center of the circle; the roller connector is connected to the end of the roller module support.

Furthermore, the arc-shaped carbon slide block is fixed on the power supply bracket or the reflux bracket through the carbon slide block bracket; and the power supply bracket and the backflow bracket are respectively fixed on the rotating motor bracket through bottom insulators.

Furthermore, the number of the roller modules is four, and each roller module is provided with three rollers; three arc-shaped carbon sliding blocks are respectively arranged on the power supply bracket and the backflow bracket.

Furthermore, the distance between the power supply row and the backflow row is marked as L, the radius of a circle where the roller rotation path is located is marked as R, and the radian number occupied by the roller module and the arc-shaped sliding plate is marked as theta and phi, so that L: R =8:5, theta =40 degrees and phi =40 degrees are taken.

The invention has the beneficial effects that:

1) the parallel bipolar rigid suspension busbar is arranged, and the traction current of the train flows back through the special backflow row, so that the stray current phenomenon caused by the backflow of the traction current through a train steel rail is avoided, the maintenance cost of the subway is reduced, and the service lives of peripheral buried metal pipelines and civil engineering structural steel bars are prolonged;

2) the traction current of the train is released to the rigidly-suspended busbar, the grounding point is still the steel rail of the train, the rail backflow phenomenon is effectively inhibited, and the normal operation of vehicle-mounted weak current equipment and the personal safety of personnel in the train are protected;

3) the pantograph head of the pantograph is rotated by the multiple rollers, so that the friction between the pantograph head and the rigid busbar can be effectively reduced under the rotation of the rollers, and the service life of the pantograph head is prolonged;

4) the invention benefits from the rotation characteristic of the multi-roller rotating pantograph head, can ensure the safe and reliable operation of a power supply-grounding system on one pantograph head, and saves the operation and maintenance cost of the subway.

Drawings

Fig. 1 is a schematic structural diagram of a multi-roller rotating pantograph head and a bipolar rigid suspension bus composite system according to the present invention.

Fig. 2 is a front view of the multiple roller rotating pantograph head and bipolar rigid suspension busbar hybrid system of the present invention.

Fig. 3 is a left side view of the multiple roller rotating pantograph head and bipolar rigid suspension busbar hybrid system of the present invention.

Fig. 4 is a top view of the multiple roller rotating pantograph head and bipolar rigid suspension bus composite system of the present invention.

In the figure: 1-power supply row; 2-refluxing and draining; 3-a locator; 4, an insulator; 5-fixing a bracket; 6-a roller; 7-roller connecting shaft; 8-an insulating support; 9-arc carbon slide block; 10-carbon slider mount; 11-a reflux scaffold; 12-arc-shaped sliding plate; 13-bottom insulator; 14-rotating machine support; 15-motor fixed shaft; 16-a rotating electrical machine; 17-a power supply bracket; 18-roller skate connecting axle; 19-roller shaft; 20-a roller connector; 21-roller module support.

Detailed Description

The invention is described in further detail below with reference to the figures and specific embodiments. As shown in fig. 1, a multi-roller rotating pantograph head and bipolar rigid suspension busbar composite system comprises a plurality of roller modules, a rotating motor 16 fixed on a rotating motor bracket 14, a power supply bar 1 and a return bar 2 which are arranged above the roller modules in parallel and horizontally; the roller modules are radially fixed on the roller connecting shaft 7 through the roller module bracket 21 and the insulating bracket 8 in sequence, and the roller connecting shaft 7 is vertically arranged at the output end of the rotating motor 16; a vertical roller sliding plate connecting shaft 18 is fixedly connected below the roller module bracket 21, and an arc-shaped sliding plate 12 is arranged on the outer side of the bottom end of the roller sliding plate connecting shaft 18; the roller 6 with at least one roller module is separately in rolling contact with the bottom surface of the power supply row 1 or the return row 2; still including the power supply support 17 of connecting the train power supply line and the backward flow support 11 of connecting the train return line, all be equipped with a plurality of arc carbon block 9 on power supply support 17 and the backward flow support 11, and respectively have an arc slide 12 alone and power supply support 17 or backward flow support 11 on arc carbon block 9 sliding contact at least.

The roller modules of the present embodiment include rollers 6 and roller connectors 20, the rollers 6 are disposed on the roller connectors 20 through horizontal roller rotating shafts 19, and the rollers 6 of all the roller modules are located on the same circumference, and the axis of the roller connecting shaft 7 passes through the center of the circle; the roller connectors 20 are connected to the ends of the roller module support 21.

The arc-shaped carbon slide block 9 of the embodiment is fixed on the power supply bracket 17 or the reflux bracket 11 through the carbon slide block bracket 10; the power supply bracket 17 and the return current bracket 11 are respectively fixed on the rotating motor bracket 14 through a bottom insulator 13.

The power supply row 1 and the backflow row 2 are mutually independent and respectively realize power supply and grounding functions, and the pantograph draws current from the power supply row 1 to the electric locomotive and then flows back to the traction substation through the backflow row 2. The multi-roller rotating pantograph head reduces friction between the pantograph head and a bus bar and improves the utilization rate of the pantograph head under the condition of ensuring the normal operation of a power supply-grounding system.

The top of the pantograph head of the multi-roller rotating pantograph is provided with four mutually independent roller modules, each roller module comprises three rollers 6, the three rollers 6 are connected through a roller rotating shaft 19 and a roller connector 20, the roller modules are connected with an insulating support 8 and a roller connecting shaft 7 through a roller module support 21, the roller connecting shaft 7 drives the four mutually independent roller modules to rotate around an annular path under the driving of a rotating motor 16, and the circle center of the annular path is positioned at the central line of a bipolar rigid suspension independent busbar arranged in parallel. The arc-shaped sliding plates 12 are connected through roller sliding plate connecting shafts 18, so that the arc-shaped sliding plates 12 and the rollers 6 rotate synchronously, and three arc-shaped carbon sliding blocks 9 are arranged on the power supply bracket 17 and the backflow bracket 11 respectively and are in contact with the arc-shaped sliding plates 12 to take current and backflow. As shown in FIG. 4, twelve rollers 6 are arranged under the same annular path, and four arc-shaped sliding plates 12 are also arranged under the same annular path. The roller modules are in one-to-one correspondence with the arc-shaped sliding plates 12 in the vertical direction, and when the rollers 6 in the roller modules take current and return current, the arc-shaped sliding plates 12 corresponding to the roller modules realize the power supply return current function on the arc-shaped carbon sliding blocks 9. And can guarantee that at any moment, there is a gyro wheel module at least to arrange 1 and the contact of backward flow row 2 with the power, respectively have an arc carbon block 9 and arc slide 12 contact on power supply support 17 and the backward flow support 11 at least to guarantee to pull the normal operating of power supply system.

In order to ensure that the normal operation of a power supply-grounding system can be ensured at any time and at any rotation angle, the invention sets the proportion between the distance L between the power supply row 1 and the return row 2 and the rotation path R of the roller, and also sets the size between the arc degrees theta and phi occupied by the roller module and the arc-shaped sliding plate 12. Through tests, when L: R =8:5, theta =40 degrees and phi =40 degrees, at any moment, at least one roller module is arranged on each of the power supply row 1 and the return row 2 to be in contact with the power supply row, and at least one arc-shaped sliding plate 12 is arranged on each of the power supply bracket 17 and the arc-shaped carbon sliding block 9 on the return bracket 11 to be in contact with the power supply row and the return row. In addition, can also effectively guarantee that power supply row 1 and backward flow row 2 do not short circuit.

Under the connection of the insulating support 8 and the bottom insulator 13, the integrity of the pantograph head of the pantograph is ensured, the electric contact of each roller module and the arc-shaped sliding plate 12 is effectively isolated, and the safe and reliable operation of a power supply-grounding system is ensured.

The working modes of the invention are as follows: the roller 6 in the roller module is contacted with the power supply row 1 to take current, and the arc-shaped sliding plate 12 is contacted with the arc-shaped carbon sliding block 9 on the power supply bracket through the roller sliding plate connecting shaft 18 to transmit electric energy to the train; the train passes through the arc-shaped carbon sliding block 9 on the backflow bracket 11, the traction backflow is transmitted to the arc-shaped sliding plate 12 in contact with the arc-shaped carbon sliding block 9, and then the traction current is sent back to the traction substation through the roller sliding plate connecting shaft 18 and the roller 6 in contact with the backflow row 2.

Claims

1. A multi-roller rotating pantograph head and bipolar rigid suspension busbar composite system is characterized by comprising a plurality of roller modules, a rotating motor (16) fixed on a rotating motor bracket (14), and a power supply bar (1) and a return bar (2) which are arranged above the roller modules in parallel and horizontally; the roller modules are radially fixed on a roller connecting shaft (7) sequentially through a roller module support (21) and an insulating support (8), and the roller connecting shaft (7) is vertically arranged at the output end of the rotating motor (16); a vertical roller sliding plate connecting shaft (18) is fixedly connected below the roller module bracket (21), and an arc sliding plate (12) is arranged on the outer side of the bottom end of the roller sliding plate connecting shaft (18); the roller (6) with at least one roller module is separately in rolling contact with the bottom surface of the power supply row (1) or the backflow row (2); still including power supply support (17) of connecting the train power supply line and backflow support (11) of connecting the train return line, all be equipped with a plurality of arc carbon slider (9) on power supply support (17) and backflow support (11), and respectively have arc slide (12) alone and power supply support (17) or backflow support (11) arc carbon slider (9) sliding contact at least.

2. The multiple roller rotary pantograph head and bipolar rigid suspension busbar combination system according to claim 1, wherein said roller modules comprise rollers (6) and roller connectors (20), a plurality of rollers (6) are arranged on the roller connectors (20) through a horizontal roller rotating shaft (19), and the rollers (6) of all the roller modules are located on the same circumference, and the axis of the roller connecting shaft (7) passes through the center of the circumference; the roller connector (20) is connected to the end of the roller module support (21).

3. The multiple roller rotary pantograph head and bipolar rigid suspension busbar hybrid system according to claim 1, wherein said arc-shaped carbon block (9) is fixed to a power supply bracket (17) or a return bracket (11) by a carbon block bracket (10); the power supply support (17) and the backflow support (11) are fixed on the rotating motor support (14) through bottom insulators (13) respectively.

4. The multiple roller rotary pantograph head and bipolar rigid suspension bus compound system of claim 1, wherein said roller modules are four, each roller module having three rollers (6); three arc-shaped carbon sliding blocks (9) are respectively arranged on the power supply bracket (17) and the backflow bracket (11).

5. The multiple-roller rotating pantograph head and bipolar rigid suspension bus compound system according to claim 1, wherein a distance between the power supply row (1) and the return row (2) is denoted as L, a radius of a circle where a rotation path of the roller (6) is located is denoted as R, and radians of a circle occupied by the roller module and the arc-shaped sliding plate (12) are denoted as θ and Φ, wherein L: R is 8:5, θ is 40 °, and Φ is 40 °.