Integral cantilever with adjustable damping and adjusting method

Abstract

The invention relates to the field of cantilevers, and particularly discloses an integral cantilever with an adjustable damper and an adjusting method.The integral cantilever comprises a cantilever frame, the cantilever frame is provided with a rotating structure and the cantilever damper, the rotating structure is used for enabling the cantilever frame to rotate relative to a tower, and a rotating shaft extends in the horizontal direction; the cantilever damper is used for applying resistance to rotation of the cantilever frame. The method has the effect of reducing the amplitude of the overhead line system under the condition that the cost is controllable, so that the off-grid rate is reduced, and a space is created for train acceleration.

Description

Technical Field

[0001] The present application relates to the field of wrist arms, and in particular to an integral wrist arm with adjustable damping. Background Art

[0002] High-speed trains can significantly shorten the time and space distance between cities, promote regional economic integration, and have multiple strategic significances for the economy, society, science and technology, and environmental protection. Therefore, all countries are actively developing high-speed trains and pursuing speed increases.

[0003] The overhead contact network is a key device for providing continuous power to trains in electrified railways. The overhead contact network is in sliding contact with the pantograph of the train to transmit power from the train to the vehicle. The contact network wave speed is a key parameter in the design of the contact network, which directly determines the maximum speed of the train.

[0004] The standard deviation of contact force refers to the deviation of the contact force between the pantograph and the contact network from its average value. When the wave speed ratio exceeds 0.7, the frequencies of the pantograph-network interaction excitation wave and the forward wave are similar, and the two types of wave vibrations resonate at the same frequency. The wave energy accumulates at the contact point, causing the contact network to shake drastically, and the standard deviation of the contact force will increase significantly.

[0005] Therefore, when the wave speed ratio exceeds 0.7, the current collection quality deteriorates sharply, that is, the pantograph and the contact network are frequently disconnected, which eventually leads to the inability of the train to speed up. Although replacing the contact wire of the contact network to increase the tension and reduce the line density can increase the wave speed, reduce the wave speed ratio, and reduce the amplitude of the contact network, the risk of line breakage is high and the cost is uncontrollable. Summary of the invention

[0006] In order to reduce the amplitude of the contact network under controllable costs, the present application provides an integral arm with adjustable damping and an adjustment method.

[0007] In the first aspect, the present application provides an integral wrist arm with adjustable damping, which adopts the following technical solution: An integral arm with adjustable damping comprises an arm frame, on which a rotation structure and arm damping are arranged, wherein the rotation structure is used to enable the arm frame to rotate relative to a pole tower with the rotation axis extending in a horizontal direction, and the arm damping is used to apply resistance to the rotation of the arm frame.

[0008] By adopting the above technical solution, after the cantilever frame is installed on the pole tower by means of a rotating connection through a rotating structure, since the rotation axis of the cantilever frame extends in the horizontal direction, when the contact network is subjected to wave vibrations such as bow-net interaction excitation waves, forward waves, or even wind blowing, causing the contact network to shake up and down, the cantilever frame can rotate slightly, effectively reducing the mechanical damage to the cantilever frame caused by the vibration of the contact network. By applying force to the cantilever frame through the cantilever damping, the frequency of the bow-net interaction excitation wave and the vibration frequency of the contact network can be changed, the amplitude of the contact network can be improved, and the off-grid rate can be reduced. Compared with replacing the wire material of the contact line, the cantilever of this application creates space for increasing train speed while keeping costs under control.

[0009] Compared with setting relevant damping structures on the pantograph, although it can also reduce the off-grid rate, such a setting can only suppress the generation of bow-net interactive excitation waves. In addition to the bow-net interactive excitation waves generated on the contact network when the pantograph contacts the contact network, wave vibrations such as forward waves will also be formed on the contact network. In addition, the contact network will also vibrate due to external factors such as wind. The overall vibration problem of the contact network cannot be solved by adding damping to the pantograph. However, the present application can improve the overall vibration of the contact network system, especially the suppression of amplitude, by rotating the arm frame and matching the arm damping for suppression.

[0010] Optionally, the rotating structure includes a rotating hole opened on the arm frame, and the axis of the rotating hole extends in the horizontal direction.

[0011] By adopting the above technical solution, when installing the arm of the present application, the arm can be connected to the pole tower by inserting a pin into the rotating hole and installing the pin on the pole tower. Such a setting has a simple structure and is easy to realize an integral structural setting of the arm.

[0012] Optionally, the end of the cantilever frame is used to connect to a pole tower, the end of the cantilever frame used to connect to the pole tower includes an upper connecting end and a lower connecting end, the upper connecting end is located on the upper side of the lower connecting end, and the cantilever damping is a telescopic damping; The rotating structure is arranged on the lower connecting end, and the arm damping is arranged on the upper connecting end; or The rotating structure is arranged on the upper connecting end, and the arm damping is arranged on the lower connecting end.

[0013] By adopting the above technical solution, if the cantilever frame is rotated as a whole and set on the pole tower, and the cantilever is applied with rotation resistance through the cantilever damping, it is equal to the cantilever damping as rotation damping. At this time, the direction of the damping force applied by the cantilever damping is consistent with the rotation direction of the cantilever frame, and the weight of the cantilever and the weight of the contact network are both applied to the cantilever damping, that is, the damping force is needed to directly counteract the weight, which has high requirements for the cantilever damping and low reliability.

[0014] Compared with the overall rotation of the cantilever frame set on the pole tower, by setting the rotating structure on the upper connecting end or the lower connecting end, the cantilever damping is correspondingly installed on the lower connecting end or the upper connecting end, and the cantilever damping is set as telescopic damping. The telescopic damping can bear the weight through its own mechanical structure without the need to directly resist gravity through damping force, and the rotating structure can also share a small part of the weight, and the reliability is greatly improved.

[0015] The main function of the arm is to provide for the installation of the contact network. The load-bearing cables in the contact network are located on the upper side of the arm and supported by the arm. The contact wire is hung on the lower side of the load-bearing cable, that is, the entire weight of the contact network is mainly applied to the upper end of the arm. When the contact network vibrates, the upper end of the arm is also more affected. When the arm frame rotates, the contact network applies tension or pressure to the arm damping. Compared with the rotating structure set on the upper connecting end, the arm damping is set on the lower connecting end. By setting the rotating structure on the lower connecting end and the arm damping on the upper connecting end, that is, the position of the arm damping is closer to the upper end of the arm for load-bearing, a telescopic response is made to the wave vibration, and the effect of eliminating the wave vibration is better.

[0016] Compared with directly setting the arm damper at the contact of the catenary, since the catenary is connected to the contact line, the voltage on the catenary is also very high. Such a setting will not only complicate the arm structure of the present application, but also cause the arm damper to be in a high-voltage environment. The arm damper set at the connection between the arm frame and the pole tower is directly connected to the pole tower and separated from the catenary. Not only is there an insulated arm frame between the two, but it can also be directly grounded through the pole tower, which is highly safe and helpful for maintenance, replacement and installation.

[0017] Optionally, the wrist-arm damping is adjustable damping.

[0018] By adopting the above technical solution, the arm damping is set to adjustable damping, and the damping coefficient is adjusted according to the maximum speed limit of the train on the line to optimize the suppression effect of wave vibration and the protection effect of the arm. For the arm in the area with clear section speed limit, the damping coefficient is also adjusted in a targeted manner to maximize the suppression effect of wave vibration and the protection effect of the arm.

[0019] Optionally, it also includes a positioner for connecting to the contact line, one end of the positioner is rotatably set on the cantilever frame, and the positioner is provided with a positioning damper, which is used to apply resistance to the rotation of the positioner.

[0020] By adopting the above technical solution, positioning damping is set on the positioner to apply damping force to the positioner when the contact line vibrates and drives the positioner to rotate, thereby suppressing the amplitude. In this way, the contact line and the pantograph can be kept in close contact as much as possible, reducing the off-grid rate.

[0021] Optionally, the positioning damping is adjustable damping.

[0022] By adopting the above technical solution, adjustable damping is selected for positioning damping, and similarly, adjustable damping is selected for wrist arm damping. The damping coefficient is matched according to the maximum speed limit of the train on the line. The wrist arm in the area with clear section speed limit matches the damping coefficient according to the section speed limit, so as to optimize the wave vibration suppression effect and the wrist arm protection effect.

[0023] In the second aspect, the present application provides a method for adjusting an integral wrist arm with adjustable damping, which adopts the following technical solution: A method for adjusting an integral arm with adjustable damping is applied to the integral arm with adjustable damping. The damping coefficient of the arm damping in the section of the route is adjusted according to the maximum speed limit of the train in the route. The higher the maximum speed limit of the train in the route, the greater the damping coefficient of the arm damping with the largest damping coefficient in the section of the route.

[0024] By adopting the above technical solution, the damping coefficient of the arm damping with the best suppression effect on the contact network vibration at different vehicle speeds is obtained in advance through experiments and other means. The higher the vehicle speed, the greater the damping coefficient of the arm damping that achieves the best suppression effect on the contact network vibration. For example, after adjustment according to this method, the damping coefficient of the arm damping with the largest damping coefficient in the line with a speed limit of 400km / h is A, and the damping coefficient of the arm damping with the largest damping coefficient in the line with a speed limit of 350km / h is B, and A is greater than B.

[0025] When installing and adjusting the arm damping, the damping coefficient of the arm damping is adjusted to match the maximum speed limit of the train route. Compared with setting the arm damping with the same damping coefficient in lines with different maximum speed limits, this setting can optimize the suppression effect of wave vibration, reduce the off-grid rate, and reduce damage to the contact network system and the arm.

[0026] Optionally, the damping coefficient of the arm damping in different speed ranges is adjusted according to the different speed ranges of the train in the line section, and the higher the speed limit of the speed range, the greater the damping coefficient of the arm damping in the speed range.

[0027] By adopting the above technical solution, the damping coefficient setting of the arm damping is further refined. For the clear speed range, the arm damping with the corresponding damping coefficient is matched to suppress the wave vibration in a targeted manner, thereby maximizing the protection effect of the overhead line system. For example, there are multiple speed ranges with clear speed limits in the line with a speed limit of 350km / h. The speed limit of speed range A is 200km / h, the speed limit of speed range B is 300km / h, and the speed limit of speed range C is 350km / h. After adjustment according to this method, the relative size of the damping coefficient of the arm damping in the three speed ranges A, B, and C is: the damping coefficient of the arm damping in the speed range A < the damping coefficient of the arm damping in the speed range B < the damping coefficient of the arm damping in the speed range C.

[0028] In summary, the present application includes at least one of the following beneficial technical effects: It can suppress the wave vibration on the entire contact network, reduce the off-grid rate of the pantograph, create space for further speed increase of the train, and also protect the wrist arm, effectively reducing the mechanical damage to the wrist arm caused by wave vibration; The rotating mechanism is arranged at the lower connecting end, and the arm damping is arranged at the upper connecting end. Not only the arm damping has a better load-bearing effect, but also the response feedback to the wave vibration is better, that is, the suppression and elimination effect of the wave vibration is better, and it is also helpful for the maintenance, replacement and installation of the arm damping. Both the wrist damping and positioning damping use damping with adjustable damping coefficient, which can be better matched according to the speed limit. The targeted configuration of the damping coefficient can maximize the elimination and suppression effect of wave vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application (positive positioning).

[0030] Figure 2 It is a schematic diagram of the structure of an embodiment of the present application (reverse positioning).

[0031] Figure 3 It is a schematic diagram of the structure of the embodiment of the present application after being installed on the pole tower (positive positioning).

[0032] Figure 4 yes Figure 1 A magnified schematic diagram of center A.

[0033] Description of reference numerals: 1. Cantilever frame; 11. Upper connecting end; 12. Lower connecting end; 13. Rotating structure; 131. Rotating hole; 14. Cantilever damping; 2. Positioner; 21. Positioning damping; 3. Positioning column; 4. Load-bearing cable seat. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-4This application is described in further detail. Example

[0035] Embodiment 1 of the present application discloses an integral wrist arm with adjustable damping. Figure 1 , Figure 2 The integral cantilever with adjustable damping comprises a cantilever frame 1, a locator 2 for connecting with the contact line, and a locating column 3 for connecting the cantilever frame 1 and the locator 2.

[0036] Reference Figure 1 , Figure 2 One end of the positioning column 3 is fixed to the lower side of the arm frame 1, and the other end of the positioning column 3 extends downward in the vertical direction. One end of the positioner 2 is rotatably set on the positioning column 3, and the other end of the positioning column 3 is used to connect with the contact line. The rotation axis of the positioner 2 extends in the horizontal direction. A positioning damper 21 is provided at the connection between the positioning column 3 and the positioner 2. The positioning damper 21 can adopt friction damping, hydraulic damping, magnetic damping, etc. Any method with an adjustable damping coefficient and capable of applying resistance to the rotation of the positioner 2 is acceptable. In the embodiment of the present application, the positioning damper 21 is preferably magnetic damping.

[0037] Reference Figure 1 , Figure 2 A load-bearing cable seat 4 is fixed on the upper side of the cantilever frame 1, that is, the load-bearing cable seat 4 is located on the horizontal beam of the cantilever frame 1, and the load-bearing cable seat 4 is used for installing the load-bearing cable and supporting the load-bearing cable.

[0038] Reference Figure 1 , Figure 3 The end of the cantilever frame 1 is used to connect to the pole tower, and the end of the cantilever frame 1 used to connect to the pole tower includes an upper connecting end 11 and a lower connecting end 12. The upper connecting end 11 is located on the upper side of the lower connecting end 12, and the upper connecting end 11 is the end of the horizontal beam used to connect to the pole tower.

[0039] Reference Figure 3 , Figure 4 The cantilever frame 1 is provided with a rotating structure 13 and a cantilever damper 14. In the embodiment of the present application, the rotating structure 13 is a rotating hole 131 provided on the lower connecting end 12, and the axis of the rotating hole 131 extends in the horizontal direction. By inserting the pin into the pole tower and rotating it, the cantilever frame 1 can rotate around the axis of the rotating hole 131. In other embodiments, the rotating structure 13 can also be a rotating shaft directly fixed on the upper connecting end 11, and any method that can enable the cantilever frame 1 to rotate relative to the pole tower and the rotating axis to extend in the horizontal direction is acceptable.

[0040] Reference Figure 3 , Figure 4The arm damper 14 is used to apply resistance to the rotation of the arm frame 1. In the embodiment of the present application, the arm damper 14 is a telescopic damper. One end of the arm damper 14 is used to be fixed on the pole tower, and the other end of the arm damper 14 is fixed on the upper connecting end 11. The arm damper 14 is telescopic along the extension direction of the horizontal beam of the arm frame 1. The arm damper 14 can adopt friction damping, hydraulic damping, magnetic damping, etc., and any adjustable damping with adjustable damping coefficient can be used.

[0041] In other embodiments, the arm damper 14 may be installed on the lower connecting end 12, and the rotating structure 13 may be arranged on the upper connecting end 11. The rotating structure 13 may also be arranged on both the upper connecting end 11 and the lower connecting end 12, and the arm damper 14 may be replaced by a rotating damper.

[0042] The implementation principle of the embodiment 1 of the present application is as follows: after the contact network is vibrated due to contact with the pantograph or being blown by the wind, on the one hand, the positioner 2 rotates, and the positioning damper 21 applies a damping force to the positioner 2 to reduce the amplitude of the contact line and minimize the offline rate of the pantograph. On the other hand, the arm frame 1 rotates slightly to minimize the mechanical damage of the arm frame 1. The arm damper 14 is subjected to tension or pressure, and applies a damping force to the rotation of the arm frame 1 to minimize the amplitude of the load-bearing cable, thereby reducing the amplitude of the contact line. The arm of the present application is set in the entire line, which can suppress the vibration of the entire contact network system. The damping coefficients of the arm damper 14 and the positioning damper 21 are adjusted to adapt to the speed of the installed area, which can maximize the suppression and elimination effect of the vibration of the contact network system. The application of the arm of the present application can greatly reduce the off-grid rate of the pantograph under high speed conditions without replacing the contact line wire, creating space for the train to further increase the speed. Example

[0043] Embodiment 2 of the present application discloses a method for adjusting an integral wrist arm. The method for adjusting an integral wrist arm is as follows: According to the maximum speed limit of the train on the route, the damping coefficients of the arm damping and the positioning damping in the route are adjusted. The higher the maximum speed limit of the train on the route, the greater the damping coefficients of the arm damping and the positioning damping with the largest damping coefficients in the route. According to the different speed ranges of the train on the route, the damping coefficients of the arm damping and the positioning damping in different speed ranges are adjusted. The higher the speed limit of the speed range, the greater the damping coefficients of the arm damping and the positioning damping in the speed range.

[0044] The implementation principle of Example 2 of the present application is: when the arm is installed, the arm damping and positioning damping whose damping coefficients match the speed limit of the current position are selected through the above-mentioned scheme, or the damping coefficients of the arm damping and positioning damping are adjusted to match the speed limit of the current position, so as to maximize the wave vibration suppression effect on the contact network system, thereby maximizing the protection effect of the contact network.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An integral arm with adjustable damping, comprising an arm frame (1), characterized in that: The cantilever frame (1) is provided with a rotation structure (13) and a cantilever damper (14); the rotation structure (13) is used to enable the cantilever frame (1) to rotate relative to the pole tower with the rotation axis extending in the horizontal direction; and the cantilever damper (14) is used to apply resistance to the rotation of the cantilever frame (1).

2. The integral arm with adjustable damping according to claim 1, characterized in that: The rotating structure (13) comprises a rotating hole (131) provided on the arm frame (1), and the axis of the rotating hole (131) extends in the horizontal direction.

3. The integral arm with adjustable damping according to claim 1, characterized in that: The end of the cantilever frame (1) is used to be connected to a pole tower, the end of the cantilever frame (1) used to be connected to the pole tower comprises an upper connecting end (11) and a lower connecting end (12), the upper connecting end (11) is located on the upper side of the lower connecting end (12), and the cantilever damper (14) is a telescopic damper; The rotating structure (13) is arranged on the lower connecting end (12), and the arm damping (14) is arranged on the upper connecting end (11); or The rotating structure (13) is arranged on the upper connecting end (11), and the arm damping (14) is arranged on the lower connecting end (12).

4. The integral arm with adjustable damping according to claim 1 or 2, characterized in that: The arm damping (14) is adjustable damping.

5. The integral arm with adjustable damping according to claim 1, characterized in that: It also includes a positioner (2) for connecting to the contact line, one end of the positioner (2) is rotatably arranged on the cantilever frame (1), and a positioning damper (21) is arranged on the positioner (2), and the positioning damper (21) is used to apply resistance to the rotation of the positioner (2).

6. The integral arm with adjustable damping according to claim 5, characterized in that: The positioning damping (21) is adjustable damping.

7. A method for adjusting an integral wrist arm with adjustable damping, characterized in that: The integral arm with adjustable damping as described in claim 3 adjusts the damping coefficient of the arm damping (14) in the section according to the maximum speed limit of the train in the route, and the higher the maximum speed limit of the train in the route, the greater the damping coefficient of the arm damping (14) with the largest damping coefficient in the section.

8. The method for adjusting an integral wrist arm with adjustable damping according to claim 7, characterized in that: The damping coefficient of the arm damper (14) in different speed ranges is adjusted according to the different speed ranges of the train in the line section, and the higher the speed limit of the speed range, the greater the damping coefficient of the arm damper (14) in the speed range.

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