Double expansion nail copper bar connector suitable for track traffic power supply system uniform backflow

Abstract

The utility model provides a double expansion nail copper bar connector suitable for track traffic power supply system even backflow, is used for installing in the track side that has opened at least two track side side hole, this double expansion nail copper bar connector includes track side mounting plate and installation cable connecting plate, and track side mounting plate and installation cable connecting plate are connected with one angle, and installation cable connecting plate is equipped with a plurality of cooperation cable installation through -hole interval, cooperation cable installation through -hole is used for installing at least one ear cable with line through first bolt and first nut, and the side of track side mounting plate towards track is provided with two expansion nails, and two expansion nails are located on the left and right two sides of track side mounting plate respectively, and the left and right two sides of track side mounting plate are provided with two track installation through -hole, and the central through -hole of expansion nail is connected with track installation through -hole concentrically and homodirectionally one to one. The utility model can safely and conveniently install a plurality of cables on the track according to the actual double hole position of track and through the double expansion nail copper bar connector.

Description

Technical Field

[0001] This utility model relates to the field of rail transit technology, specifically to a double-expansion pin copper busbar connector suitable for return current in rail transit power supply systems. Background Technology

[0002] Chinese utility model patent document with publication number CN202523864U discloses an expansion bolt terminal for connecting the equalization and return cables of a rail transit power supply system to the rail, including a copper sleeve connecting plate and a bolt. The copper sleeve connecting plate includes a cylindrical copper sleeve with a locking connection hole and a copper plate with a cable connector connection hole. The copper sleeve is used to install in the rail hole, and the bolt is used to pass through the locking connection hole to lock the copper sleeve connecting plate to the rail.

[0003] Chinese utility model patent document with publication number CN208835281U discloses a rail connecting expansion bolt, including an expansion bolt copper sleeve, the expansion bolt copper sleeve being a hollow cylinder, the expansion bolt copper sleeve penetrating the mounting hole of the rail and forming an interference fit, the outer surface of the expansion bolt copper sleeve being provided with a limit block, the left section of the expansion bolt copper sleeve extending out of the rail web being fixed to the rail, the right section of the expansion bolt copper sleeve extending out of the rail web being connected to a cable conductor, and the left section of the expansion bolt copper sleeve extending out of the rail web being fixed to the rail by riveting.

[0004] The expansion bolt connectors in the above technical solutions are all single expansion bolt connectors, and a single expansion bolt connector connects one or two cables through a bolt hole. Even if those skilled in the art can easily think of expanding the ability to connect multiple cables by adding bolt holes, such a design will lead to a decrease in the structural strength of the expansion bolt connector in the rail transit power supply system and is prone to loosening during installation. Utility Model Content

[0005] In view of this, it is necessary to address the defects and shortcomings of the existing technology by proposing a double-expansion pin copper busbar connector suitable for the uniform return of power supply systems in rail transit. This would allow for the safe and convenient installation of multiple cables on rails where the uniform return of power supply systems in rail transit is achieved, based on the actual location of the double holes in the rails, through the double-expansion pin copper busbar connector.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model proposes a double-expansion-pin copper busbar connector suitable for the return current of rail transit power supply systems. It is used for installation on the side of a track with at least two track-side through holes. The double-expansion-pin copper busbar connector includes a track-side mounting plate and a cable mounting connection plate, which are connected at an angle. The cable mounting connection plate has multiple mating cable mounting through holes spaced apart, used to install at least one cable with a lug via a first bolt and a first nut. Two expansion pins protrude from the track-side side of the track-side mounting plate, located on the left and right sides of the plate. Two track mounting through holes are provided on the left and right sides of the track-side mounting plate, and the central through holes of the expansion pins are concentrically connected to the track mounting through holes. When installing the double-expansion-pin copper busbar connector, each expansion pin is embedded into a corresponding connecting through hole on the track side. After being embedded in the connecting through hole on the track side, the expansion pins are tightened using a second bolt and a second nut.

[0008] Furthermore, the main structure of both the track-side mounting plate and the main structure of the cable connection plate are rectangular parallelepipeds.

[0009] Furthermore, the track-side mounting plate and the cable connection plate are integrally formed or bent copper components.

[0010] Furthermore, each expansion pin is distributed at intervals in a first virtual straight line, which is parallel to the length or lateral direction of the track-side mounting plate.

[0011] Furthermore, each of the mating cable mounting through holes is distributed at another second virtual straight line interval; the number of the mating cable mounting through holes is at least four.

[0012] Furthermore, this second virtual straight line is parallel to the length direction of the mounting cable connection plate.

[0013] Furthermore, the included angle is a right angle.

[0014] Furthermore, the expansion bolt includes an integrally formed expansion tube body and a threaded mounting tube body connected in sequence; the expansion tube body is used to embed into the connecting through hole on the side of the track; the threaded mounting tube body is provided with an external thread that mates with the internal thread of the track mounting through hole, and the threaded mounting tube body is used to be screwed into the track mounting through hole in a threaded fit.

[0015] Furthermore, the bottom of the expansion bolt tube is welded to the edge of the rail mounting through hole.

[0016] Furthermore, the bottom of the expansion bolt tube is integrally formed and connected to the track-side mounting plate.

[0017] The beneficial effects of this utility model are as follows:

[0018] This utility model enables the safe and convenient installation of multiple cables on tracks where the power supply system of rail transit is returned, based on the actual location of the double holes in the track and through the double expansion bolt copper busbar connector.

[0019] In particular, when installing four or more cables, the double expansion pin copper busbar connector of this utility model has a more secure and stable installation effect and a longer service life.

[0020] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the double expansion pin copper busbar connector of the present invention, which is suitable for the return current of power supply systems for rail transit.

[0022] Figure 2 This is a three-dimensional structural diagram of the double expansion stud copper busbar connector of this utility model, which is suitable for the return current of rail transit power supply systems, installed after being mounted on the track. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be further described clearly and completely below in conjunction with the embodiments of this utility model. It should be noted that the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] It should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] The terms “first,” “second,” “third,” and “fourth” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, the use of “first,” “second,” “third,” and “fourth” to designate a feature may explicitly or implicitly include one or more of that feature.

[0026] Example 1

[0027] like Figure 1 , Figure 2 As shown:

[0028] This embodiment proposes a double-expansion-pin copper busbar connector suitable for the return current of rail transit power supply systems. It is used for installation on the side of a rail with at least two rail-side through holes. The double-expansion-pin copper busbar connector includes a rail-side mounting plate 5 and a cable mounting connection plate 8. The rail-side mounting plate 5 and the cable mounting connection plate 8 are connected at an angle. The cable mounting connection plate 8 has multiple mating cable mounting through holes 82 spaced apart. Each mating cable mounting through hole 82 is used to install at least one cable 100 with a lug via a first bolt and a first nut. Two expansion pins 9 protrude from the side of the rail-side mounting plate 5 facing the rail. The two expansion pins 9 are located on the left and right sides of the rail-side mounting plate 5, respectively. Two rail mounting through holes (not shown in the attached figure) are provided on the left and right sides of the rail-side mounting plate 5. The central through hole 91 of each expansion pin 9 is concentrically connected to the rail mounting through hole (not shown in the attached figure). When installing this double-expansion-pin copper busbar connector, each expansion pin 9 is embedded into the corresponding connecting through hole on the side of the rail. After being embedded into the connecting through hole on the side of the rail, the expansion pin 9 is tightened by a second bolt and a second nut.

[0029] Ideally, the main structure of the track-side mounting plate 5 and the main structure of the cable connection plate 8 are both rectangular blocks; this makes installation easier and facilitates matching with the pre-drilled connection holes on the side of the track.

[0030] Ideally, the track-side mounting plate 5 and the cable connection plate 8 are integrally formed or bent copper components.

[0031] Ideally, each expansion pin 9 is distributed at a first virtual straight line interval, which is parallel to the length or lateral direction of the track-side mounting plate 5; this makes installation easier and also improves the load-bearing capacity of the connector for multiple cables.

[0032] Ideally, each of the mating cable mounting through holes 82 is distributed at another second virtual straight line interval; the number of mating cable mounting through holes 82 is at least four; this makes installation more convenient and allows for the neat and non-interfering installation of multiple cables.

[0033] Ideally, the second virtual straight line is parallel to the length direction of the mounting cable connection plate 8.

[0034] Ideally, the included angle is a right angle.

[0035] Specifically, one preferred installation process for the double-expansion pin copper busbar connector applicable to the return current of rail transit power supply systems in this embodiment is as follows:

[0036] First, drill holes at the rail web position. Insert each expansion bolt 9 on the rail side mounting plate 5 into the corresponding hole in the rail. Use a special tool to rivet two expansion bolts 9 on the rail side mounting plate 5 into the corresponding hole in the rail, forming a connecting hole that runs through the rail side mounting plate 5 and the rail. At this time, without the second nut installed, the expansion bolts 9 on the rail side mounting plate 5 are stretched, squeezed, and plastically deformed by the special tool and then riveted into the rail hole. They are completely riveted together with the hole drilled on the rail, forming a firm and precise connection. Then, use a welding tool to perform low-temperature heating welding on the rail and the rail side mounting plate 5 (after welding, the gap between the rail and the rail side mounting plate 5 is filled with welding filler metal and forms an effective and reliable transition connection). Then, use the second nut, along with a spring washer and a flat washer, to sequentially insert into the through hole of the welded rail side mounting plate 5 and the rail. Then, tighten the second nut for secondary locking. Finally, clean the weld slag at the welding edge between the rail and the rail side mounting plate 5 and apply anti-corrosion material for anti-corrosion sealing.

[0037] The double-expansion pin copper busbar connector of this embodiment, which is suitable for the return current of rail transit power supply systems, also has the following advantages:

[0038] The double expansion pin copper busbar connector of this embodiment, which is suitable for the return current of the power supply system of rail transit, can complete the task of connecting multiple (e.g., twelve) cables. Only two holes need to be drilled on the steel track side to complete the connection, which is convenient for installing multiple traction power supply lines and convenient for overall installation.

[0039] The double expansion bolt copper busbar connector of this embodiment, which is applicable to the return current of the power supply system of rail transit, realizes the direct connection between the rail-side mounting plate 5 and the rail (i.e., steel rail), avoiding the phenomenon of using a separate protective expansion bolt to undertake multiple transfers between the copper busbar and the rail, thereby reducing the number of mechanical connection surfaces and further improving the reliability of electrical connection.

[0040] The double-expansion pin copper busbar connector of this embodiment, applicable to the return current of rail transit power supply systems, improves the installation process of existing products, increases installation efficiency, and solves the problem of excessively long welding and installation time during the construction of new lines and later operation and maintenance.

[0041] For example, in practical applications of rail transit, the cable type responsible for the return current on the rail at the location corresponding to the traction power supply substation is 150mm. 2 -240mm 2 If there are twelve cables, twelve 19mm holes need to be drilled in the rail to install twelve cables with lugs. Six holes need to be drilled at the position of a 320mm copper busbar to complete the connection of the twelve cables (connecting the terminals at the top and bottom, with two cable terminals installed in one hole). Only two 19mm holes need to be drilled on the side of the rail to complete the connection.

[0042] In rail transit depots and parking lots, where signaling equipment, isolation grounding, and other equipment are concentrated and need to be connected to the rails at the front and middle positions of the depot, due to limited space and the requirement to drill holes in the rails with a center-to-center distance of more than 200mm between holes, power supply and current sharing generally require the connection of eight to twelve cables. In this case, the connector of this utility model can effectively reduce the number of holes drilled in the rails per unit length.

[0043] Example 2

[0044] Example 2 is a further optimization of any one of the technical solutions in Example 1;

[0045] like Figure 1 , Figure 2 As shown:

[0046] Optimally, the expansion pin 9 includes an integrally formed expansion tube body and a threaded mounting tube body connected in sequence; the expansion tube body is used to be embedded in the connecting through hole on the side of the track; the threaded mounting tube body is provided with an external thread that mates with the internal thread of the track mounting through hole, and the threaded mounting tube body is used to be screwed into the track mounting through hole in a threaded engagement.

[0047] Specifically, holes are drilled in the track-side mounting plate 5 and its inner hole is machined into a nut-type internal thread. The outer side of the copper rod is threaded to match the inner hole thread of the track-side mounting plate 5 and tightened. Then, through machining (or cold stamping) process, an inner hole composed of an inner cone and a straight hole is formed, thereby completing the integral copper busbar with the reserved expansion pin 9.

[0048] Example 3

[0049] Example 3 is an alternative to Example 2;

[0050] like Figure 1 , Figure 2 As shown:

[0051] The bottom of the expansion pin 9 is welded to the edge of the through hole for mounting the rail.

[0052] Specifically, holes are drilled and chamfered on the track-side mounting plate 5, and the reserved expansion bolts 9 are welded to the track-side mounting plate 5 to form an integral copper busbar.

[0053] Example 4

[0054] Example 4 is an alternative to Example 2;

[0055] like Figure 1 , Figure 2 As shown:

[0056] The bottom of the expansion bolt 9 is integrally formed and connected to the track-side mounting plate 5.

[0057] Specifically, the track-side mounting plate 5 is extruded in one piece. The cylindrical expansion pin 9 pre-reserved on the track-side mounting plate 5 is integrally formed with the track-side mounting plate 5. The expansion pin 9 has a through hole in the center, which is composed of a combination of a conical inner hole and a straight through hole.

[0058] Example 5

[0059] Example 5 is an alternative to Example 2;

[0060] like Figure 1 , Figure 2 As shown:

[0061] Drill holes in the track-side mounting plate 5 and rivet the reserved expansion bolts 9 to the track-side mounting plate 5 to form an integral copper busbar (including the integral copper busbar formed by thermal expansion and contraction interference fit).

[0062] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A double-expansion pin copper busbar connector suitable for return current in rail transit power supply systems, for installation on a rail side with at least two rail-side through holes, the double-expansion pin copper busbar connector comprising a rail-side mounting plate (5) and a cable mounting connection plate (8), the rail-side mounting plate (5) and the cable mounting connection plate (8) being connected at an angle, the cable mounting connection plate (8) having a plurality of mating cable mounting through holes (82) spaced apart, the mating cable mounting through holes (82) being used to install at least one cable (100) with a lug by means of a first bolt and a first nut, characterized in that, Two expansion pins (9) are protruding from the side of the track-side mounting plate (5) facing the track. The two expansion pins (9) are located on the left and right sides of the track-side mounting plate (5) respectively. Two track mounting through holes are opened on the left and right sides of the track-side mounting plate (5). The central through hole (91) of the expansion pin (9) is concentrically connected to the track mounting through hole. When installing the double expansion pin copper busbar connector, each expansion pin (9) is embedded into the connecting through hole on the side of the track. The expansion pin (9) is used to tighten the installation by the second bolt and the second nut after being embedded into the connecting through hole on the side of the track. The track-side mounting plate (5) and the cable connection plate (8) are integrally formed or bent copper components; The bottom of the tube of the expansion stud (9) is integrally formed and connected to the track side mounting plate (5); the bottom of the tube of the expansion stud (9) is used to weld to the edge of the track mounting through hole; The expansion pin (9) has a through hole at its center, which is a combination of a tapered inner hole and a straight through hole.

2. The double expansion nail copper bar connector suitable for the equal return current of the rail transit power supply system according to claim 1, characterized in that, The main structure of the track-side mounting plate (5) and the main structure of the cable connection plate (8) are both rectangular blocks.

3. The double expansion nail copper bar connector suitable for the equal return current of the rail transit power supply system according to claim 1, characterized in that, Each expansion pin (9) is distributed in a first virtual straight line interval, which is parallel to the length direction or the lateral direction of the track side mounting plate (5).

4. The double expansion nail copper bar connector suitable for the equal return current of the rail transit power supply system according to claim 1, characterized in that, Each of the aforementioned mating cable mounting through holes (82) is distributed at another second virtual straight line interval; the number of the mating cable mounting through holes (82) is at least four.

5. The double expansion nail copper bar connector suitable for the equal return current of the rail transit power supply system according to claim 4, characterized in that, The second virtual straight line is parallel to the length direction of the mounting cable connection plate (8).

6. The dual expansion nail copper bar connector suitable for the equal return current of the rail transit power supply system according to claim 1, characterized in that, The included angle is a right angle.

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