A lightweight busbar expansion joint suitable for low headroom

Abstract

The present invention relates to an expansion joint suitable for a low-headroom lightweight busbar, comprising: a first and a second expansion joint arranged in parallel; a first flow taker, one end of which is fixedly connected to the first expansion joint, and a lower pressure plate is fixedly arranged at the bottom of the other end; a second flow taker, one end of which is fixedly connected to the second expansion joint, and a lower pressure plate is fixedly arranged at the bottom of the other end; the lower pressure plate has a horizontal section arranged horizontally, a groove is provided in the horizontal section, and a pressure block is installed in the horizontal section, the top of which is against the second expansion joint or the bottom of the first expansion joint; the pressure block cooperates with the bottom of the flow taker to clamp the second expansion joint or the first expansion joint, and the first flow taker is slidably connected to the second expansion joint or the second flow taker is slidably connected to the first expansion joint; the first expansion joint can slide relative to the second expansion joint to ensure the stable operation of the locomotive and improve the safety and reliability of the locomotive operation.

Description

Technical Field

[0001] The invention relates to an expansion joint, in particular to an expansion joint suitable for a low-headroom lightweight busbar. Background Art

[0002] Urban rail transit is constrained by topography, urban planning and other conditions. Most of the urban areas are underground. The contact network in the underground tunnel mainly adopts rigid suspension, and its structural height is limited by the tunnel clearance. In actual engineering, the rigid contact network suspension system and components must not only meet the tunnel clearance requirements, but also ensure safe and reliable power supply. Therefore, the development of bus expansion joints suitable for low-clearance tunnel environments is the future development trend of rigid contact networks.

[0003] The ideal operating state of the rigid suspension power supply system is reliable contact between the pantograph and the contact wire, which provides a guarantee for the electric locomotive to continuously obtain electricity from the contact wire; reliable contact and interaction between the pantograph and the contact wire are important conditions to ensure good current collection of the electric locomotive.

[0004] The rigid contact network suspension structure has a large rigidity. When the pantograph passes through a positioning point with large rigidity at high speed, it will be impacted, especially at the joint of the anchor section, which is not conducive to good dynamic current collection between the pantograph and the catenary. The large rigidity of the positioning point causes serious and uneven wear of the contact line of the rigid contact network, which affects the normal contact and current collection between the pantograph and the catenary, and thus affects the operation safety. The bus expansion joint is connected in series in the middle of the busbars of the two anchor sections. Due to the sudden increase in weight, the contact force of the pantograph changes suddenly, thus forming a hard point between the pantograph and the catenary. The hard point causes the pantograph to go offline and the high-temperature arc generated at the moment of going offline, which brings great harm to the contact network and the pantograph.

[0005] Therefore, the deadweight of the busbar expansion joint will affect the smoothness of the contact line. The smaller its deadweight, the smaller the sag, the smoother the contact line, and the more reliable the contact line and pantograph contact, which can better ensure the safe operation of the power supply system. At the same time, the convenient replacement of some parts after its installation and application should be considered to improve the efficiency of inspection and maintenance.

[0006] Based on the above, how to provide a lightweight bus expansion joint suitable for low clearance, which can not only be suitable for low clearance tunnel environment, but also compensate for the thermal expansion and contraction of the system caused by temperature changes, ensure the smoothness of the contact line by limiting the sag of the expansion joint, achieve reliable contact between the pantograph and the contact line at the anchor section joint, ensure good current collection of the pantograph, improve the pantograph's tracking ability to the rigid contact network, and improve the current collection quality of the pantograph network, which is of great significance for reducing the overall project investment. Summary of the invention

[0007] The technical problem to be solved by the present invention is: how to achieve good electrical connection and smooth transition between anchor sections in a low-headroom tunnel environment.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] The present invention is an expansion joint suitable for a low-headroom lightweight busbar, comprising: a first expansion joint and a second expansion joint arranged in parallel; a first flow taker, one end of which is fixedly connected to the first expansion joint, and a lower pressure plate is fixedly arranged at the bottom of the other end; a second flow taker, one end of which is fixedly connected to the second expansion joint, and a lower pressure plate is fixedly arranged at the bottom of the other end; the lower pressure plate has a horizontal section arranged horizontally, a groove is provided in the horizontal section, and a pressure block is installed in the horizontal section, the top of which is against the second expansion joint or the bottom of the first expansion joint; the pressure block cooperates with the bottom of the flow taker to clamp the second expansion joint or the first expansion joint, and the first flow taker is slidably connected to the second expansion joint or the second flow taker is slidably connected to the first expansion joint;

[0010] A first expansion joint is fixedly connected to one side of the first current taker, and a second expansion joint is movably connected to the other side; a second expansion joint is fixedly connected to one side of the second current taker, and the first expansion joint is movably connected to the other side; the current taker and the expansion joint are clamped by the nylon pressure block and the lower pressure plate, thereby limiting the sagging of the expansion joint; when the power supply system freely expands and contracts in the line due to thermal expansion and contraction, the first expansion joint can slide relative to the second expansion joint, thereby achieving good electrical connection and smooth transition between the anchor sections, ensuring stable operation of the locomotive, and improving the safety and reliability of locomotive operation.

[0011] The present invention adopts an elastic member placed in the groove, and the elastic member acts on the bottom of the pressing block, so that the pressing block always abuts against the bottom of the expansion joint.

[0012] Under the action of the elastic member, the pressing block always abuts against the bottom of the first expansion joint, thereby achieving the clamping of the first expansion joint or the second expansion joint.

[0013] The present invention adopts a second expansion joint or a first expansion joint with a first semicircular groove on the top; a first current collector or a second current collector with a second semicircular groove on the bottom, and the length of the first semicircular groove is greater than the length of the second semicircular groove; spring contacts are installed in the first semicircular groove and the second semicircular groove; their function is to achieve sliding electrical contact.

[0014] A carbon slide plate is provided at one end of the spring contact finger, and its function is to remove dust in the second semicircular groove of the expansion joint during sliding to ensure good contact between the spring contact finger and the expansion joint; the graphite debris rubbed off during sliding can play a lubricating role, making the sliding smoother.

[0015] A spring device is installed on the upper part of the carbon slide plate, which can apply vertical pressure to the carbon slide plate during the sliding consumption process of the slide plate, so that the carbon slide plate keeps in contact with the second semicircular groove.

[0016] In order to achieve a fixed connection between the first bus and the current taker, the first current taker and the first expansion joint of the present invention are connected by bolts, and a strap contact finger is provided between the two; the second current taker and the second expansion joint are connected by bolts, and a strap contact finger is also provided between the two; the function of the strap contact finger is to achieve fixed electrical contact.

[0017] In order to ensure smooth sliding between the first expansion joint and the second expansion joint, the present invention adopts a slide groove between the first expansion joint and the second expansion joint; a slider is located in the slide groove and fixed to the first expansion joint or the second expansion joint; and a chip groove is opened in the slide groove.

[0018] A slider is installed between the first or second expansion joint. The fixed end of the slider is made of stainless steel, and the sliding end is made of polymer material to cover the stainless steel body, so that the overall structure of the slider has high strength and good wear resistance and self-lubricating performance at the sliding end; a number of chip grooves are designed on the first or second expansion joint to effectively remove dust accumulated during operation.

[0019] In order to facilitate replacement of the slider, the present invention adopts a hollow groove at the end of the slide groove; the length of the hollow groove is greater than the length of the slider;

[0020] In order to facilitate the replacement of the slider and pull out the slider, the end of the slider is fixed with a pulling bolt;

[0021] In order to prevent the slider from falling out when it is effectively running, the present invention adopts a limit bolt arranged in the hollow groove.

[0022] In order to increase the contact surface with the busbar and improve conductivity, and to make the forces on both sides of the busbar uniform and to have the characteristic of anti-torsion, the end of the first expansion joint or the second expansion joint is equipped with an aluminum pad in contact with the busbar.

[0023] In order to reduce the overall weight of the bus expansion joint, the present invention uses two small-area aluminum alloy blocks as current takers, which ensures good electrical connection while greatly reducing the weight of the expansion joint, thereby reducing the sag and ensuring the smoothness of the contact line.

[0024] The beneficial effects of the present invention are as follows: the present invention is a lightweight bus expansion joint suitable for low-headroom, which is particularly light in weight. The first expansion joint can slide relative to the second expansion joint to ensure stable operation of the locomotive and improve the safety and reliability of locomotive operation. The device itself has a small structural height and low headroom requirements, and can be well adapted to low-headroom tunnel installation environments. In addition, the device can compensate for thermal expansion and contraction caused by temperature changes in the system, ensure the smoothness of the contact line by limiting the sag of the expansion joint, achieve reliable contact between the pantograph and the contact line at the anchor section joint, ensure good current collection by the pantograph, and improve the pantograph's ability to follow the rigid contact network, thereby improving the current collection quality of the pantograph network. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 is an exploded view of the second flow taker or the first flow taker;

[0028] Figure 3 It is a schematic diagram of accessories for the chute and slider;

[0029] In the figure: 1-first expansion joint, 2-second expansion joint, 3-first flow taker, 4-second flow taker, 5-lower pressure plate, 6-horizontal section, 7-pressure block, 8-first semicircular groove, 9-second semicircular groove, 10-carbon slide plate, 11-band contact finger, 12-slide groove, 13-slider, 14-chip groove, 15-hollow groove, 16-lifting bolt, 17-limiting bolt, 18-aluminum pad, 19-bus. DETAILED DESCRIPTION

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0031] like Figure 1-2As shown, the present invention is an expansion joint suitable for a low-headroom lightweight busbar, comprising: a first expansion joint 1 and a second expansion joint 2 arranged in parallel; a first flow taker 3, one end of which is fixedly connected to the first expansion joint 1, and a lower pressure plate 5 is fixedly arranged at the bottom of the other end; a second flow taker 4, one end of which is fixedly connected to the second expansion joint 2, and a lower pressure plate 5 is fixedly arranged at the bottom of the other end; the lower pressure plate 5 has a horizontal section 6 arranged horizontally, and a groove is provided on the horizontal section 6, in which a pressure block 7 is installed, the top of which is against the bottom of the second expansion joint 2 or the first expansion joint 1; the pressure block 7 cooperates with the bottom of the flow taker to clamp the second expansion joint 2 or the first expansion joint 1, and slides the first flow taker 3 with the second expansion joint 2 or slides the second flow taker 4 with the first expansion joint 1;

[0032] A first expansion joint is fixedly connected to one side of the first current taker, and a second expansion joint is movably connected to the other side; a second expansion joint is fixedly connected to one side of the second current taker, and the first expansion joint is movably connected to the other side; the current taker and the expansion joint are clamped by a pressure block and a lower pressure plate to limit the sagging of the expansion joint; when the power supply system freely expands and contracts in the line due to thermal expansion and contraction, the first expansion joint can slide relative to the second expansion joint to achieve good electrical connection and smooth transition between anchor sections, thereby ensuring stable operation of the locomotive and improving the safety and reliability of locomotive operation.

[0033] like Figure 1 As shown, in order to reduce the overall weight of the bus expansion joint, the present invention uses two small-area aluminum alloy blocks as current takers, which ensures good electrical connection while greatly reducing the weight of the expansion joint, thereby reducing the sag and ensuring the smoothness of the contact line.

[0034] like Figure 2 As shown, in order to make the pressing block always abut against the bottom of the expansion joint, the present invention adopts an elastic member placed in the groove, and the elastic member acts on the bottom of the pressing block 7.

[0035] Under the action of the elastic member, the pressing block always abuts against the bottom of the first expansion joint, thereby achieving the clamping of the first expansion joint or the second expansion joint.

[0036] like Figure 1-2 As shown, the present invention adopts a second expansion joint 2 or a first expansion joint 1 with a first semicircular groove 8 on the top; a first current collector 3 or a second current collector 4 with a second semicircular groove 9 on the bottom, and the length of the first semicircular groove 8 is greater than the length of the second semicircular groove 9; spring contacts are installed in the first semicircular groove 8 and the second semicircular groove 9; their function is to achieve sliding electrical contact.

[0037] A carbon slide plate 10 is provided at one end of the spring contact finger, and its function is to remove dust in the second semicircular groove 9 of the expansion joint during the sliding process to ensure good contact between the spring contact finger and the expansion joint; the graphite debris that falls off during the sliding process can play a lubricating role, making the sliding smoother. A spring device is installed on the upper part of the carbon slide plate, which can apply vertical pressure to the slide plate during the sliding consumption process of the slide plate to keep it in contact with the second semicircular groove.

[0038] like Figure 1-2 As shown, in order to achieve a fixed connection between the expansion joint and the current collector, the present invention adopts a first current collector 3 and a first expansion joint 1 connected by bolts, and a strap contact finger 11 is provided between the two; the second current collector 4 and the second expansion joint 2 are connected by bolts, and a strap contact finger 11 is provided between the two; the function of the strap contact finger 11 is to achieve fixed electrical contact.

[0039] like Figure 3 As shown, in order to ensure smooth sliding between the first expansion joint 1 and the second expansion joint 2, the present invention adopts a slide groove 12 between the first expansion joint 1 and the second expansion joint 2; a slider 13, which is located in the slide groove 12 and fixed to the first expansion joint 1 or the second expansion joint 2; and a chip groove 14, which is opened in the slide groove 12.

[0040] A slider is installed between the first or second expansion joint. The fixed end of the slider is made of stainless steel, and the sliding end is made of polymer material to cover the stainless steel body, so that the overall structure of the slider has high strength and good wear resistance and self-lubricating properties at the sliding end to ensure smooth sliding between the two expansion joints; a number of chip removal grooves are designed on the first or second expansion joint to effectively remove dust accumulated during operation.

[0041] like Figure 3 As shown, the present invention adopts a hollow groove 15 at the end of the slide groove 12; the length of the hollow groove 15 is greater than the length of the slider 13; the slider can be easily replaced.

[0042] like Figure 3 As shown, in order to facilitate pulling out the slider when replacing the slider, the end of the slider 13 is fixed with a pulling bolt 16 in the present invention.

[0043] like Figure 3 As shown, in order to prevent the slider from falling out when the slider is effectively running, the present invention adopts a limit bolt 17 provided in the hollow groove 15.

[0044] like Figure 3 As shown, in order to increase the contact area between the expansion joint and the busbar and improve the conductivity; to make the force on both sides of the busbar uniform and have the characteristic of anti-torsion, the end of the first expansion joint 1 or the second expansion joint 2 is equipped with an aluminum pad 18 in contact with the busbar.

[0045] The invention is an expansion joint suitable for low-headroom lightweight busbars. It is particularly light in weight, and the first expansion joint can slide relative to the second expansion joint to ensure stable operation of the locomotive and improve the safety and reliability of locomotive operation. The device itself has a small structural height and low headroom requirements, and can be well applied to low-headroom tunnel installation environments. In addition, it can compensate for thermal expansion and contraction caused by temperature changes in the system, ensure the smoothness of the contact line by limiting the sag of the expansion joint, achieve reliable contact between the pantograph and the contact line at the anchor section joint, ensure good current collection by the pantograph, improve the pantograph's ability to follow the rigid contact network, and improve the current collection quality of the pantograph network.

[0046] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A low headroom lightweight busbar expansion joint, characterized in that: include: Two parallel-arranged first expansion joints and second expansion joints; A first flow extractor, one end of which is fixedly connected to the first expansion joint, and a lower pressure plate is fixedly arranged at the bottom of the other end; A second flow collector, one end of which is fixedly connected to the second expansion joint, and the bottom of the other end of which is fixedly provided with the lower pressure plate; The lower pressing plate has a horizontal section arranged horizontally, a groove is provided in the horizontal section, and a pressing block is installed in the groove, the top of which abuts against the bottom of the second expansion joint or the first expansion joint; The pressing block cooperates with the bottom of the flow collector to clamp the second expansion joint or the first expansion joint, and slidingly connects the first flow collector with the second expansion joint or slidingly connects the second flow collector with the first expansion joint.

2. The low headroom lightweight busbar expansion joint according to claim 1, characterized in that: An elastic member is placed in the groove, and the elastic member acts on the bottom of the pressing block.

3. The low headroom lightweight busbar expansion joint according to claim 1, characterized in that: A first semicircular groove is provided on the top of the second expansion joint or the first expansion joint; A second semicircular groove is provided at the bottom of the first flow collector or the second flow collector, and the length of the first semicircular groove is greater than the length of the second semicircular groove; A spring contact finger, which is placed in the first semicircular groove and the second semicircular groove; The carbon slide plate is arranged at the end of the spring contact finger and is located in the first semicircular groove and the second semicircular groove.

4. The low headroom lightweight busbar expansion joint according to claim 1, characterized in that: The first current collector and the first expansion joint are connected by bolts, and a strap contact finger is arranged between the two; The second current extractor and the second expansion joint are connected by bolts, and a strap contact finger is arranged between the two.

5. The low headroom lightweight busbar expansion joint according to claim 1, characterized in that: A slide groove is provided between the first expansion joint and the second expansion joint; A sliding block, which is located in the sliding groove and fixed to the first expansion joint or the second expansion joint; A chip removal groove is provided in the slide groove.

6. The low headroom lightweight busbar expansion joint according to claim 5, characterized in that: A hollow groove is provided at the end of the slide groove; The length of the hollow groove is greater than the length of the sliding block.

7. The low headroom lightweight busbar expansion joint according to claim 6, characterized in that: A lifting bolt is fixed to the end of the sliding block.

8. The low headroom lightweight busbar expansion joint according to claim 6, characterized in that: A limiting bolt is arranged in the hollow groove.

9. The low headroom lightweight busbar expansion joint according to claim 1, characterized in that: An end of the first current collector or the second current collector is connected to the busbar via bolts.

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