CN111251949B - Lightweight grounding reflux device suitable for rail transit grounding third rail - Google Patents
Lightweight grounding reflux device suitable for rail transit grounding third rail Download PDFInfo
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- CN111251949B CN111251949B CN202010046282.4A CN202010046282A CN111251949B CN 111251949 B CN111251949 B CN 111251949B CN 202010046282 A CN202010046282 A CN 202010046282A CN 111251949 B CN111251949 B CN 111251949B
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- Prior art keywords
- grounding
- rail
- reflux
- roller
- spring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M5/00—Arrangements along running rails or at joints thereof for current conduction or insulation, e.g. safety devices for reducing earth currents
Abstract
The invention discloses a light-weight grounding reflux device suitable for a rail transit grounding third rail, wherein a reflux roller is arranged at the bottom of a locomotive through a spring damping device and a rotating arm, when the reflux roller rolls, traction current firstly flows through a roller main shaft and a grounding carbon brush, and then is transmitted to the grounding third rail through the outer layer of the reflux roller and returns to the negative pole of a traction substation, so that the work grounding is realized; the invention can effectively improve the current situation of rail circulation of the motor train unit, inhibit the galvanic corrosion of the stray current on the steel rail and the interference on other electrical equipment, has light weight design, meets the technical standard of reflux voltage, does not consume more materials, and ensures the reliability of reflux by using a damping measure.
Description
Technical Field
The invention belongs to the technical field of rail transit, and particularly relates to a light-weight grounding reflux device suitable for a rail transit grounding third rail.
Background
The traction power supply system consists of a traction substation, a return line, a contact network, a locomotive, a steel rail and the like, and traction current flows back to the substation from the path of the traction substation. The rail is one of the components of the traction power supply system, and besides being used as a running rail of the locomotive, the rail also serves as a return conductor of the traction power supply network.
Because the motor train unit is in a motion state at all times, compared with the grounding of an electric power system, the motor train unit has specificity, and the difficulty of research and optimization of the motor train unit is greatly increased. According to different functions, the grounding system of the motor train unit can be divided into a working grounding and a protective grounding: the working ground provides a return path for traction current of the motor train unit; the vehicle body is connected with the steel rail through the grounding wire, the grounding carbon brush and the wheel pair through protection grounding, and a public reference ground potential is provided for vehicle-mounted weak current equipment. The unreasonable grounding mode can cause voltage difference of different grounding points to form local circulation of the rail, and the current leaks to the bearing box to cause abnormal heating and electrochemical corrosion of the bearing box; and when lightning stroke or overvoltage operation occurs, the potential of the vehicle body is raised, and the personal safety of personnel in the vehicle is seriously threatened.
The steel rail and the ground are connected in parallel to form a loop, which is a commonly used return flow path in the electrified railway. Since the rail is not completely insulated from the ground, some current will leak to the ground during the reflow process. According to the soil property, a part of current flows through the ground and flows back to the steel rail again, and flows to the negative electrode of the traction substation through the steel rail and returns to the traction substation; another part flows into the ground to form a ground current, and this part of the current is called a stray current. In the process of stray current leakage from the steel rail to the ground, the steel rail is just positioned in an anode area of electrochemical corrosion, so that the steel rail is easy to corrode and damage, accessories such as spikes, buried metal structures and the like are also easy to corrode, the service life of the metal structures is greatly shortened, and serious economic loss is caused; stray current is leaked to the ground through the transverse transition admittance between the rail and the ground near the current taking point of the locomotive, reenters the steel rail near the current return point, returns to the grounding end of a power supply, generates obvious steel rail-to-ground potential in the steel rail near the current receiving point and the current return point of the locomotive, and possibly causes damage to passengers, line maintenance personnel and equipment.
At present, few grounding devices adopted for grounding backflow are researched, a current receiving device is designed for a contact net with a voltage level of 27.5kV, the voltage level of a backflow point of a wheel set and a steel rail is often below hundred volts, and if the structure of the current receiving device is directly used for backflow grounding, the material utilization is insufficient and the voltage level is not consistent with the voltage level. Therefore, in order to ensure the safe operation of the high-speed railway, a new solution, namely a lightweight grounding reflux device suitable for the rail transit grounding third rail, is required to be provided, and by adding a special reflux rail parallel to the steel rail for working grounding and isolating the special reflux rail from protective grounding, the rail circulation can be effectively avoided, and meanwhile, the degree of the steel rail corrosion caused by stray current is inhibited; and the backflow device used in a matched manner meets the lightweight design standard, meets the voltage standard generated by backflow, and simultaneously ensures the reliability of backflow.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a light-weight grounding reflux device suitable for a rail transit grounding third rail.
The invention relates to a light-weight grounding reflux device suitable for a rail transit grounding third rail, which has the following structure: the fixed seat is connected with the bottom of the locomotive through a main shaft of the reflux device, and the side supports positioned at two sides of the bottom of the fixed seat limit the positions of all components; the spring fixing plate is connected with the fixing seat through four supporting devices.
The small sleeves at one ends of the two spring damping devices are limited at the bottom of the spring fixing plate through fastening screws, and the large sleeve at the other end movably penetrates through a damping spring limiting shaft; the spring damping device consists of a compression cylinder and a piston rod, and a damping spring is sleeved on the piston rod between the compression cylinder and the spring baffle.
The rotating centers of the two rotating arms are fixed on a rotating shaft on the side bracket, one end of each rotating arm penetrates through a damping spring limiting shaft and then is fixed by a limiting device, and the other end of each rotating arm is connected with a backflow roller and then is fixed by a roller limiting ring.
The outer layer of the reflux roller freely rotates around a roller main shaft through a bearing, a plurality of grounding carbon brushes are arranged on the roller main shaft, and the grounding carbon brushes are connected with the outer layer of the reflux roller in a rolling way; the outer layer of the reflux roller is in rolling contact with the grounded third rail.
When the reflux roller rolls, the traction current firstly flows through the roller main shaft and the grounding carbon brush, then is conducted to the grounding third rail through the outer layer of the reflux roller and returns to the negative pole of the traction substation, and the purpose of working grounding is achieved.
Furthermore, the bottom of the side support is provided with a sliding plate tray, and a guide sliding plate is fixed on the sliding plate tray to play a role in fixing and guiding.
Furthermore, the side support is of an arc-shaped structure and is used for reducing mechanical impact on the guide sliding plate.
Further, the roller spindle is wrapped with a shaft sleeve to limit the positions of the bearings at the two ends and the grounding carbon brush, and end covers are further arranged at the two ends of the shaft sleeve.
Furthermore, the shaft sleeve is made of an insulating material.
Compared with the prior art and structure, the invention has the beneficial effects that:
1. the invention can effectively improve the current situation of rail circulation of the motor train unit, inhibit the galvanic corrosion of the stray current on the steel rail and the interference on other electrical equipment, has light weight design, meets the technical standard of reflux voltage, does not consume more materials, and ensures the reliability of reflux by using a damping measure.
2. The invention adopts the rolling friction of the reflux roller and the grounded third rail to replace the sliding friction, can constantly change the contact position of the reflux roller and the grounded third rail, has sufficient time for heat dissipation of the roller, and can simultaneously reduce the loss of the working surface of the roller, so that the roller material can be more fully utilized and uniformly consumed; the spring damping device can greatly reduce mechanical impact generated due to uneven grounding third rail, so that the return roller can be always attached to the grounding third rail, the condition of working grounding fault caused by instant separation of the return roller from the grounding third rail is reduced, and the spring damping device plays an important role in ensuring safe running of the motor train unit.
3. The guide sliding plates arranged on the two sides of the device can play a role in fixing and guiding, and the backflow device is prevented from shaking caused by left and right jolting or turning of a train.
Drawings
Fig. 1 is a schematic view of the overall structure of the reflow apparatus of the present invention.
FIG. 2 is a side view of the reflow apparatus of the present invention.
Fig. 3 is a sectional view of a reflow cylinder of the reflow apparatus of the present invention.
Fig. 4 is a perspective view of a spring damper of the reflow apparatus of the present invention.
Fig. 5 is a schematic view of the contact between the reflow apparatus and the grounded third rail according to the present invention.
Fig. 6 is a cross-sectional view of the contact between the reflow apparatus and the grounded third rail.
Wherein, the part names corresponding to the reference numbers are as follows:
1-fixing base, 2-reflux unit main shaft, 3-damping spring spacing shaft, 4-guide sliding plate, 5-spacing device, 6-sliding plate tray, 7-reflux drum, 8-drum spacing ring, 9-fastening screw, 10-rotating arm, 11-supporting device, 12-spring fixing plate, 13-drum main shaft, 14-rotating shaft, 15-side support, 16-reflux drum outer layer, 17-bearing, 18-grounding carbon brush, 19-shaft sleeve, 20-end cover, 21-small sleeve, 22-compression cylinder, 23-spring baffle, 24-damping spring, 25-small sleeve, 26-piston rod, 27-grounding third rail.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
As shown in fig. 1 and 2, the lightweight ground return device suitable for the rail transit grounding third rail of the present invention has the following structure: the fixed seat 1 is connected with the bottom of the locomotive through a main shaft 2 of the reflux device, and side supports 15 positioned at two sides of the bottom of the fixed seat 1 limit the positions of all components; the spring fixing plate 12 is connected with the fixing base 1 through four supporting devices 11.
The two spring damping devices are symmetrically and uniformly distributed, the small sleeve 21 at one end of each spring damping device is limited at the bottom of the spring fixing plate 12 through a fastening screw 9, and the large sleeve 25 at the other end movably penetrates through the damping spring limiting shaft 3. As shown in fig. 4, the spring damper device is composed of a compression cylinder 22 and a piston rod 26, and a damper spring 24 is sleeved on the piston rod 26 between the compression cylinder 22 and the spring baffle 23. The piston rod 26 is freely extendable and retractable within the compression cylinder 22 and acts in concert with the outer damping spring 24 to provide shock attenuation.
The rotation centers of the two rotating arms 10 are fixed on a rotating shaft 14 on a side support 15, one end of each rotating arm 10 penetrates through the damping spring limiting shaft 3 and then is fixed by the limiting device 5, and the other end of each rotating arm 10 is connected with the backflow roller 7 and then is fixed by the roller limiting ring 8. When the backflow roller 7 and the grounding third rail 27 are in rolling friction contact with unsmooth positions or hard points, the lifted backflow roller 7 can rotate through the rotating shaft 14, the other end of the rotating arm 10 can stretch the piston rod 26 of the spring damping device, the design can play a role in buffering, the influence of mechanical impact on the backflow device is reduced, hard collision of the backflow roller 7 at the hard points of the grounding third rail 27 is avoided, meanwhile, the backflow roller 7 can be prevented from being separated from the grounding third rail 27 after being impacted, work grounding can be enabled to work constantly, and therefore reliability of work grounding is guaranteed.
As shown in fig. 3, the reflow roller 7 has a reflow roller outer layer 16 freely rotating around the roller main shaft 13 through a bearing 17, a plurality of grounding carbon brushes 18 are mounted on the roller main shaft 13, and the grounding carbon brushes 18 are connected with the reflow roller outer layer 16 in a rolling way; the reflow roller outer layer 16 is in rolling contact with a grounded third rail 27.
When the reflux drum 7 rolls, the traction current firstly flows through the drum main shaft 13 and the grounding carbon brush 18, and then is conducted to the grounding third rail 27 through the reflux drum outer layer 16 to return to the negative pole of the traction substation, so as to achieve the purpose of working grounding.
Further, as shown in fig. 5 and 6, a sliding plate tray 6 is arranged at the bottom of the side support 15, a guide sliding plate 4 is fixed on the sliding plate tray 6, when the backflow device interacts with the grounded third rail 27, the grounded third rail 27 can be clamped by the guide sliding plates 4 at two sides to play a role in fixing and guiding, and the backflow device can be prevented from being bumped left and right when the train bumps left and right or turns.
Furthermore, the side support 15 is of an arc structure, so that mechanical impact on the sliding plate can be effectively reduced when the guide sliding plate 4 passes through an uneven place.
Further, the roller spindle 13 is wrapped with a shaft sleeve 19 to limit the positions of the bearings 17 and the grounding carbon brushes 18 at the two ends, and end covers 20 are further disposed at the two ends of the shaft sleeve 19.
Further, the sleeve 19 is made of an insulating material.
The grounding third rail 27 is a special grounding third rail which is parallel to the steel rail, the grounding third rail is connected with the negative electrode of the traction substation, and the traction current of the working grounding returns to the traction substation through the grounding third rail, so that the stray current can be effectively inhibited, and the current situation of rail circulation of the motor train unit can be improved; the design of the single-reflux roller meets the voltage grade requirement of the reflux device and the aim of light weight design; and the design of the rotating arm and the spring damping device can effectively reduce the mechanical impact of the reflux roller on the hard point of the rail surface, and ensure that the roller is always attached to the grounding third rail without the fault of work grounding separation.
Claims (4)
1. A lightweight grounding reflux device suitable for a rail transit grounding third rail is characterized in that a fixed seat (1) is connected with the bottom of a locomotive through a reflux device main shaft (2), and side supports (15) positioned on two sides of the bottom of the fixed seat (1) limit the positions of all components; the spring fixing plate (12) is connected with the fixed seat (1) through four supporting devices (11);
the small sleeves (21) at one ends of the two spring damping devices are limited at the bottom of the spring fixing plate (12) through fastening screws (9), and the large sleeve (25) at the other end movably penetrates through a damping spring limiting shaft (3); the spring damping device consists of a compression cylinder (22) and a piston rod (26), and a damping spring (24) is sleeved on the piston rod (26) between the compression cylinder (22) and the spring baffle plate (23);
the rotating centers of the two rotating arms (10) are fixed on a rotating shaft (14) on a side support (15), one end of each rotating arm (10) penetrates through a damping spring limiting shaft (3) and is fixed by a limiting device (5), and the other end of each rotating arm is connected with a backflow roller (7) and is fixed by a roller limiting ring (8);
the outer layer (16) of the reflux roller (7) freely rotates around the roller main shaft (13) through a bearing (17), a plurality of grounding carbon brushes (18) are installed on the roller main shaft (13), and the grounding carbon brushes (18) are connected with the outer layer (16) of the reflux roller in a rolling way; the outer layer (16) of the reflux roller is in rolling contact with a grounded third rail (27);
when the reflux roller (7) rolls, traction current firstly flows through the roller main shaft (13) and the grounding carbon brush (18), and then is transmitted to the grounding third rail (27) through the outer layer (16) of the reflux roller to return to the negative pole of the traction substation, so that the aim of working grounding is fulfilled;
the bottom of the side support (15) is provided with a sliding plate tray (6), and a guide sliding plate (4) is fixed on the sliding plate tray (6) to play a role in fixing and guiding.
2. The ground return apparatus for a third rail of a railway system according to claim 1, wherein the side bracket (15) has an arc-shaped structure for reducing mechanical impact on the guide sliding plate (4).
3. The lightweight grounding reflux device suitable for the rail transit grounding third rail is characterized in that a shaft sleeve (19) is wrapped on the roller main shaft (13) to limit the positions of a bearing (17) and a grounding carbon brush (18) at two ends, and end covers (20) are further arranged at two ends of the shaft sleeve (19).
4. The lightweight grounding reflux device suitable for the rail transit grounding third rail is characterized in that the shaft sleeve (19) is made of an insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010046282.4A CN111251949B (en) | 2020-01-16 | 2020-01-16 | Lightweight grounding reflux device suitable for rail transit grounding third rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010046282.4A CN111251949B (en) | 2020-01-16 | 2020-01-16 | Lightweight grounding reflux device suitable for rail transit grounding third rail |
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| Publication Number | Publication Date |
|---|---|
| CN111251949A CN111251949A (en) | 2020-06-09 |
| CN111251949B true CN111251949B (en) | 2021-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010046282.4A Expired - Fee Related CN111251949B (en) | 2020-01-16 | 2020-01-16 | Lightweight grounding reflux device suitable for rail transit grounding third rail |
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| CN (1) | CN111251949B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112389146A (en) * | 2020-11-17 | 2021-02-23 | 梁乐 | Plate support for automotive suspension |
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| RU2151702C1 (en) * | 1998-02-12 | 2000-06-27 | Омская государственная академия путей сообщения | Device for checking frequency characteristic of current collectors |
| CN103129416A (en) * | 2013-03-07 | 2013-06-05 | 西南交通大学 | Rail transit double-contact-rail power supply system |
| CN104290606A (en) * | 2014-11-06 | 2015-01-21 | 邱世军 | Multi-rotating-wheel pantograph head of pantograph |
| CN106181503A (en) * | 2016-08-31 | 2016-12-07 | 侯马市东鑫机械铸造有限公司 | A kind of air clamper of machining crankshafts dead eye |
| RU2016142488A (en) * | 2016-10-28 | 2017-01-10 | Александр Васильевич Дегтярев | The method of suspension of vehicle feed lines using a universal self-centering system having three rollers on an internal base |
| CN110303891A (en) * | 2019-07-17 | 2019-10-08 | 西南交通大学 | Self-lubricating modular metal roller block of bow collector of electric locomotive bow containing shock-damping structure |
-
2020
- 2020-01-16 CN CN202010046282.4A patent/CN111251949B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2151702C1 (en) * | 1998-02-12 | 2000-06-27 | Омская государственная академия путей сообщения | Device for checking frequency characteristic of current collectors |
| CN103129416A (en) * | 2013-03-07 | 2013-06-05 | 西南交通大学 | Rail transit double-contact-rail power supply system |
| CN104290606A (en) * | 2014-11-06 | 2015-01-21 | 邱世军 | Multi-rotating-wheel pantograph head of pantograph |
| CN106181503A (en) * | 2016-08-31 | 2016-12-07 | 侯马市东鑫机械铸造有限公司 | A kind of air clamper of machining crankshafts dead eye |
| RU2016142488A (en) * | 2016-10-28 | 2017-01-10 | Александр Васильевич Дегтярев | The method of suspension of vehicle feed lines using a universal self-centering system having three rollers on an internal base |
| CN110303891A (en) * | 2019-07-17 | 2019-10-08 | 西南交通大学 | Self-lubricating modular metal roller block of bow collector of electric locomotive bow containing shock-damping structure |
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| CN111251949A (en) | 2020-06-09 |
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Granted publication date: 20210409 Termination date: 20220116 |