阅读说明：本技术 一种基于电气化铁路的多滚筒受流-接地系统 (Multi-roller current-receiving-grounding system based on electrified railway ) 是由 肖嵩 孟举 赖新安 李玉航 童梦园 叶智宗 饶阳 杨雁 吴广宁 于 2019-11-12 设计创作，主要内容包括：本发明公开了一种基于电气化铁路的多滚筒受流-接地系统,包括设置在受电弓底座上的第一受电弓和第二受电弓；第一受电弓通过受流弓头连接接触线接触受流；第二受电弓通过回流弓头接触连接回流线；回流线连接牵引变电所到牵引变电所负极柜；受流弓头和回流弓头结构相同,受流弓头包括长方体箱型的弓头本体、设置在弓头本体内可转动的多个金属滚筒和设置在弓头本体宽边两端分别设置有第一碳滑块和第二碳滑块；金属滚筒的滚动方向与机车行进方向相互平行；本发明可有效降低磨损和特殊工况下带来的机械冲击,以及降低离线率,保证受流质量；通过改变牵引回流的回流通道,彻底解决杂散电流的问题。(The invention discloses a multi-roller current-collecting and grounding system based on an electrified railway, which comprises a first pantograph and a second pantograph, wherein the first pantograph and the second pantograph are arranged on a pantograph base; the first pantograph is connected with a contact line through a pantograph head to contact with current; the second pantograph is in contact connection with a return line through a return pantograph head; the return line is connected with the traction substation to a negative electrode cabinet of the traction substation; the structure of the current collecting bow is the same as that of the reflux bow, and the current collecting bow comprises a cuboid box-shaped bow body, a plurality of rotatable metal rollers arranged in the bow body and a first carbon slide block and a second carbon slide block which are arranged at two ends of the wide edge of the bow body respectively; the rolling direction of the metal roller is parallel to the advancing direction of the locomotive; the invention can effectively reduce the abrasion and the mechanical impact brought under special working conditions, reduce the off-line rate and ensure the current-receiving quality; the problem of stray current is thoroughly solved by changing a backflow channel for traction backflow.)

1. A multi-roller current-collecting and grounding system based on an electrified railway is characterized by comprising a first pantograph and a second pantograph, wherein the first pantograph and the second pantograph are arranged on a pantograph base (1); the first pantograph is connected with a contact wire (6) through a pantograph head (9) to contact with current; the second pantograph is in contact connection with a return line (7) through a return head (10); the return line (7) is connected with the traction substation to a negative pole cabinet of the traction substation; the structure of the current collection bow head (9) is the same as that of the backflow bow head (10); the current-collecting bow (9) comprises a cuboid box-shaped bow body, a plurality of rotatable metal rollers (16) arranged in the bow body and a first carbon slide block (14) and a second carbon slide block which are arranged at the two ends of the wide edge of the bow body respectively; the rolling direction of the metal roller (16) is parallel to the running direction of the locomotive.

2. The multi-roller current-collecting and grounding system based on the electrified railway as claimed in claim 1, wherein the metal roller (16) comprises a metal outer layer (24) with a through hole cylindrical structure arranged in the middle and a roller rotating shaft (23); the metal outer layer (24) rotates around the rotary shaft (23) of the roller through the bearing (21); an electric brush (22) is arranged between the metal outer layer (24) and the roller rotating shaft (23); two ends of the roller rotating shaft (23) are respectively provided with a clamping groove (19), and the damping screw (20) penetrates through the upper end of the clamping groove (19) and penetrates out of the lower end of the clamping groove to be fixed in the bow head body; a spring (25) is sleeved on the damping screw (20) below the clamping groove (19).

3. The multi-drum current-grounding system based on the electrified railway of claim 1, wherein the first pantograph and the second pantograph are identical in structure; the first pantograph comprises a first lower connecting rod (2) and a second lower connecting rod (3) which are arranged at the lower part, and an upper connecting rod (4) which is arranged at the upper part; the first lower connecting rod (2), the second lower connecting rod (3) and the upper connecting rod (4) form a parallelogram structure.

4. The multi-roller current-collecting and grounding system based on the electrified railway as claimed in claim 2, wherein a connecting plate is arranged below the bow body, and a plurality of fixing plates (17) are arranged on the outer surface of the bow body; the fixing plate (17) fixes the bow head body and the connecting plate through a fixing screw (18).

5. A multi-roller current-collecting-grounding system based on an electrified railway according to claim 2, characterized in that the bearing (21) is made of insulating material, in particular ceramic.

6. A multi-drum current-grounding system based on an electrified railway according to claim 1, characterized in that the metallic outer layer (24) is made of pure copper or copper alloy.

7. A multi-drum current-collecting-grounding system based on an electrified railway according to claim 1, characterized in that the pantograph base (1) is arranged on the vehicle body with a fourth isolating insulator (5) arranged therebetween.

8. A multi-drum current-grounding system based on an electrified railway according to claim 1, characterized in that the pantograph base (1) is divided into two mutually insulated parts by a first isolation insulator (11), a second isolation insulator (12) and a third isolation insulator (13) for arranging a first pantograph and a second pantograph respectively.

Technical Field

The invention relates to the technical field of rail transit, in particular to a multi-roller current-receiving-grounding system based on an electrified railway.

Background

With the rapid development of the society and the economy of China, the national economy of China is continuously and steadily developed forward, and the rail transit technology as an important support for the development of the national economy is rapidly developed in the last decade. At present, the electrification of the rail transit in active service in China is comprehensively realized, and the electric energy is mainly adopted for traction driving of the train. As the core for driving the electric locomotive, the traction power supply system mainly comprises a power grid transmission line, a traction substation, a feeder line, a traction contact network, a traveling rail, a return line and the like. The electric traction locomotive is mainly in contact with a contact net supposed on the roof through a vehicle-mounted pantograph for electric energy transmission. However, the bow net structure adopted by the existing electric traction system generally has the defects that the performance of the carbon sliding plate following the contact line is poor, the off-line rate is high when the train operates at a high speed, the electric arc is frequently generated due to off-line, the current receiving performance of the train is unstable due to various factors, and the severe weather resistance is poor. These all result in the short-lived of in service of carbon slide, change frequently, and the maintenance cost is higher.

The current receiving system is a channel for inputting energy into a train traction and control system, and the train grounding system is a main channel for returning electric energy to a large ground or feeding back to a traction substation in a traction power supply system. At present, most of rail transit power supply systems return through a traveling rail, and traction current returns to a traction substation through the traveling rail. Since the running rails cannot be completely insulated from ground, some current leaks from the running rails to the ground, resulting in stray currents. Stray currents are extremely harmful and can not only cause electrochemical corrosion to running rails and accessories thereof, but also generate rail ground potential, and possibly threaten the safety of passengers and workers. Moreover, most urban rail transit is supplied with direct current, so that the dispersion of direct current stray current in the ground is easy to interfere with surrounding alternating current transmission lines, so that direct current magnetic bias of a transformer core in a transformer substation is caused, the power quality is seriously influenced, and the transmission loss is aggravated. At present, some schemes exist for preventing and controlling stray current, such as a drainage network for avoiding a power transmission line, a stray current compensation device and the like. These measures cannot solve the problem fundamentally, and need to be made according to different lines, which is high in cost.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a multi-roller current-receiving-grounding system based on an electrified railway, which can thoroughly solve the problem of stray current.

The technical scheme adopted by the invention is as follows: a multi-roller current-collecting and grounding system based on an electrified railway comprises a first pantograph and a second pantograph which are arranged on a pantograph base; the first pantograph is connected with a contact line through a pantograph head to contact with current; the second pantograph is in contact connection with a return line through a return pantograph head; the return line is connected with the traction substation to a negative electrode cabinet of the traction substation; the structure of the current collecting bow is the same as that of the reflux bow, and the current collecting bow comprises a cuboid box-shaped bow body, a plurality of rotatable metal rollers arranged in the bow body and a first carbon slide block and a second carbon slide block which are arranged at two ends of the wide edge of the bow body respectively; the rolling direction of the metal roller is parallel to the advancing direction of the locomotive.

Furthermore, the metal roller comprises a metal outer layer and a roller rotating shaft, wherein the middle of the metal outer layer is provided with a through hole cylindrical structure; the metal outer layer rotates around the rotary shaft of the roller through a bearing; an electric brush is arranged between the metal outer layer and the rotary shaft of the roller; the two ends of the rotary shaft of the roller are provided with a clamping groove, and the damping screw penetrates through the upper end of the clamping groove and penetrates out of the lower end of the clamping groove to be fixed in the bow head body; and a spring is sleeved on the damping screw below the clamping groove.

Further, the first pantograph and the second pantograph are identical in structure; the first pantograph comprises a first lower connecting rod and a second lower connecting rod which are arranged at the lower part, and an upper connecting rod which is arranged at the upper part; the first lower connecting rod, the second lower connecting rod and the upper connecting rod form a parallelogram structure.

Furthermore, a connecting plate is arranged below the bow head body, and a plurality of fixing plates are arranged on the outer surface of the bow head body; the fixing plate fixes the bow head body and the connecting plate through the fixing screws.

Further, the bearing is made of an insulating material, specifically ceramic.

Further, the metal outer layer is made of pure copper or copper alloy.

Furthermore, the pantograph base is arranged on the vehicle body, and a fourth isolation insulator is arranged between the pantograph base and the vehicle body.

Further, the pantograph base 1 is divided into two parts insulated from each other by a first isolation insulator 11, a second isolation insulator 12 and a third isolation insulator 13, and is used for setting a first pantograph and a second pantograph respectively.

The invention has the beneficial effects that:

(1) in the invention, a special return line which is arranged in parallel on a contact line is additionally arranged, the return line is connected with a negative pole cabinet of a traction substation, and current does not flow back through a running rail any more, so that the problem of stray current is thoroughly solved;

(2) the pantograph head of the pantograph adopts a multi-metal roller structure to replace a carbon sliding plate, converts a sliding friction current collection mode into a rolling contact current collection mode of the metal roller and a contact net, and can effectively reduce the friction between the pantograph head and the contact net;

(3) in the multi-roller structure, the carbon sliding blocks with lubricating effect are arranged in front and at the back, and the damping device is arranged below the rollers, so that the severe mechanical impact between the bow nets under the condition that the train is told can be effectively reduced;

(4) the pantograph with the multi-roller structure can be applied to a flexible contact network and can also be well suitable for a rigid contact network.

Drawings

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

Fig. 2 is a top view of the overall structure of the present invention.

Fig. 3 is a schematic structural view of a double pantograph head according to the present invention.

Fig. 4 is a schematic structural view of a pantograph head of the pantograph according to the present invention.

Fig. 5 is a side view of a pantograph head of the present invention.

Fig. 6 is a top view of a pantograph head of the present invention.

FIG. 7 is a schematic cross-sectional view of a metal roller according to the present invention.

Fig. 8 is a schematic structural view of the shock absorbing device of the present invention.

Fig. 9 is a schematic view of the structure of the damping screw according to the present invention.

In the figure: 1-pantograph base, 2-first lower connecting rod, 3-second lower connecting rod, 4-upper connecting rod, 5-fourth isolating insulator, 6-contact wire, 7-return wire, 8-limit bolt, 9-current-receiving bow, 10-return bow, 11-first isolating insulator, 12-second isolating insulator, 13-third isolating insulator, 14-first carbon sliding block and 15-second carbon sliding block. 16-metal roller, 17-fixing plate, 18-fixing screw, 19-clamping groove, 20-damping screw, 21-bearing, 22-electric brush, 23-roller rotating shaft, 24-metal outer layer and 25-damping spring.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

As shown in fig. 1 to 9, a multi-roller current-collecting-grounding system based on an electrified railway comprises a first pantograph and a second pantograph arranged on a pantograph base 1; the first pantograph is connected with a contact wire 6 through a pantograph head 9 to contact with current; the second pantograph is in contact connection with a return line 7 through a return head 10; the return line 7 is connected with the traction substation to a negative electrode cabinet of the traction substation; the structure of the current collection bow 9 is the same as that of the reflux bow 10; the current-collecting bow 9 comprises a rectangular box-shaped bow body, a plurality of rotatable metal rollers 16 arranged in the bow body, and a first carbon slide block 14 and a second carbon slide block which are arranged at two ends of the wide edge of the bow body respectively; the rolling direction of the metal roller 16 is parallel to the traveling direction of the motorcycle.

The metal roller 16 comprises a metal outer layer 24 with a through hole cylindrical structure in the middle and a roller rotating shaft 23; the metal outer layer 24 rotates around the roller rotating shaft 23 through the bearing 21; an electric brush 22 is arranged between the metal outer layer 24 and the roller rotating shaft 23; both ends of the roller rotating shaft 23 are provided with a clamping groove 19, the damping screw 20 penetrates through the upper end of the clamping groove 19 from the lower end and is fixed in the bow body, and the damping screw 20 below the clamping groove 19 is sleeved with a spring 25.

The first pantograph and the second pantograph have the same structure; the first pantograph comprises a first lower connecting rod 2 and a second lower connecting rod 3 which are arranged at the lower part, and an upper connecting rod 4 which is arranged at the upper part; the first lower link 2, the second lower link 3 and the upper link 4 constitute a parallelogram structure.

A connecting plate is arranged below the bow head body, and a plurality of fixing plates 17 are arranged on the outer surface of the bow head body; the fixing plate 17 fixes the bow body and the connecting plate by a fixing screw 18.

The bearing 21 is made of an insulating material, specifically ceramic. The metal outer layer 24 is made of pure copper or a copper alloy.

The pantograph base 1 is arranged on the vehicle body, and a fourth isolation insulator 5 is arranged between the pantograph base and the vehicle body. The pantograph base 1 is divided into two parts insulated from each other by a first isolation insulator 11, a second isolation insulator 12 and a third isolation insulator 13, and is used for setting a first pantograph and a second pantograph respectively.

The invention provides a scheme for realizing compatibility of a current receiving system and a grounding return system aiming at the problem that stray current exists in the return of an electrified railway power supply system through a running rail. As shown in fig. 1, a return line 7 (connected to the negative electrode cabinet of the traction substation) arranged in parallel to the original contact line 6 is used for ground return. The return channel is changed from the original walking rail-traction substation into a return bow 9-a return line 7-traction substation, and the return is not performed through the walking rail any more, so that the problem of stray current can be thoroughly solved.

The pantograph structure of the invention is shown in the figure, and the double-pantograph head structure is shown in the figure 3. The pantograph structure is divided into two mutually insulated parts which are symmetrical and have the same mechanical structure, and both comprise a first lower connecting rod 2 and a second lower connecting rod 3 which are arranged at the lower part, and an upper connecting rod 4 which is arranged at the upper part; the first lower link 2, the second lower link 3 and the upper link 4 constitute a parallelogram structure. The upper connecting rod and the lower connecting rod are fixed through a limiting bolt 8. The first pantograph is used for contacting with the contact line 6 to receive current and transmitting electric energy for train operation, and the second pantograph is used for grounding reflux in contact with the reflux line 7 and providing a reflux channel for traction current.

The current receiving part is consistent with the current receiving mode in the traditional rail transit, the traction substation transmits current to a contact net through a connected feeder line, and the train is in contact current receiving with the contact line 6 through a current receiving bow 9 to obtain driving electric energy. In the traditional electrified railway, the return flow of the running rails is mostly adopted, and as the running rails cannot be completely insulated from the ground, part of current leaks from the running rails to the ground to be taken out, so that stray current is formed. Stray current is seriously damaged, not only can cause electrochemical corrosion to a walking rail and accessories thereof, but also the dispersion of direct-current stray current in the ground causes direct-current magnetic biasing of a transformer core in a transformer substation, the electric energy quality is seriously influenced, and the transmission loss is aggravated. The backflow mode of the invention avoids backflow through the running rail, can fundamentally avoid the generation of stray current, can prolong the service life of the running rail and ensure the normal operation of electrical equipment.

Aiming at the common problems of poor performance of a carbon sliding plate following contact line, high off-line rate at high speed, frequent generation of electric arcs, unstable current receiving performance, poor severe weather resistance and serious abrasion of the carbon sliding plate in a pantograph-catenary structure adopted by the conventional electric traction system, the carbon sliding plate is replaced by a pantograph bow with a multi-metal roller structure. The purposes of reducing abrasion, reducing impact force and reducing off-line rate can be achieved. The pantograph head structure is shown in fig. 4, and the metal roller 16 is contacted with the contact line 6 to roll and receive current so as to provide electric energy for train operation. The sliding friction between the original carbon sliding plate and the contact line is changed into rolling friction, so that the abrasion can be effectively reduced. Referring to fig. 7, a cross-sectional view of the metal roller is shown, a bearing 21 inside the metal roller 16 can ensure that the metal roller 16 rotates around a roller rotating shaft 23 when contacting with the contact line 6, and the bearing 21 adopts an insulating bearing to avoid the galvanic corrosion of the bearing 21 caused by the current. The metal outer layer 24 is made of pure copper or copper alloy. And a damping device is arranged below each metal roller 16, as shown in fig. 8, the damping device comprises a clamping groove 19, a roller rotating shaft 23 and a damping screw 20; the damping screw 20 is sleeved with a damping spring 25. The contact wire 6 is contacted with the head of the pantograph of the multi-metal roller, and the pantograph is pressed on the contact wire 6 by the damping spring 25 to roll and rub to receive current. Can reduce like this because the track is uneven or cross the mechanical shock that brings when the contact net hard spot, can make the pantograph closely laminate with contact wire 6 simultaneously, reduce the off-line rate.

The multi-metal roller pantograph head replaces the traditional carbon sliding plate pantograph head, the rolling friction replaces the sliding friction, and the damping spring reduces the abrasion and the mechanical impact brought under special working conditions, reduces the off-line rate and ensures the current collection quality. By adopting the method of compatibility of current collection and grounding backflow, the backflow channel of traction current is changed, backflow does not occur through the traveling rail, the problem of stray current can be thoroughly solved, and the safe operation of the train is ensured.