A friction-damped pantograph for post-earthquake track operation

Abstract

This invention discloses a friction-damped pantograph for post-earthquake track operation. A vertically arranged diamond-shaped damping device is connected between the upper and lower arms. A vibration isolation support is installed between the pantograph head and the upper arm, and an acceleration sensor is installed at the pantograph head. When the high-speed train is running on a smooth track, the diamond-shaped damping device is inactive. When the high-speed train is running on an uneven track after an earthquake, the vibration between the pantograph and the contact wire increases significantly, and the acceleration at the pantograph head changes significantly. When the acceleration change exceeds a specified range, the acceleration sensor transmits an electrical signal to the diamond-shaped damping device, activating the device. Through frictional energy dissipation, the device improves the energy dissipation and vibration reduction effect of the structure. Simultaneously, the vibration isolation support at the pantograph head reduces vibration, preventing large-amplitude vibrations of the pantograph when the high-speed train is running on an uneven track after an earthquake, thereby improving the current collection quality of the pantograph.

Description

Technical Field

[0001] This invention belongs to the field of high-speed railway equipment, specifically a friction-damped pantograph for vibration reduction of trains on tracks after an earthquake. Background Technology

[0002] High-speed trains are powered by high-voltage electricity supplied to the railway tracks. Electricity is transmitted through the contact between the train's pantograph and the overhead contact line. The electrical system consisting of the pantograph and the contact wire is called the pantograph-catenary system. This system can also be used to control the stopping and starting of trains. The sliding contact between the pantograph and the contact wire is a crucial component of the high-speed railway's overhead contact system, directly determining the quality of electrical energy transmission from the contact wire to the train.

[0003] The probability of high-speed railways encountering earthquakes is significantly increased when they pass through mountainous earthquake fault zones and coastal areas with high earthquake intensity. After experiencing strong earthquakes, the structure of high-speed railways will deform, making the tracks uneven.

[0004] When high-speed trains run on uneven tracks after an earthquake, the vibration between the pantograph and the overhead contact line increases significantly, posing a huge challenge to the current collection quality of the pantograph-catenary system.

[0005] Currently, pantographs only use ordinary spring damping devices at the pantograph head, which is not ideal for damping. Summary of the Invention

[0006] The purpose of this invention is to provide a friction-damped pantograph with good current collection from the contact line after an earthquake, so as to ensure the normal operation of high-speed trains on uneven tracks after an earthquake.

[0007] The friction damping and vibration reduction pantograph for post-earthquake track operation provided by this invention adopts the following technical solution: a vertically arranged diamond-shaped damping device is connected between its upper arm and lower arm, a vibration isolation support component is provided between its pantograph head and the upper arm, and an acceleration sensor is provided at the pantograph head.

[0008] When the above technical solution is implemented, the rhomboid damping device includes two sets of inner steel plates, two sets of outer steel plates, and electric push rods; each set of inner and outer steel plates includes two parallel steel plates, and the two sets of outer steel plates sandwich the two sets of inner steel plates to form a vertical rhombus; the top and bottom of the rhombus are hinged by prestressed bolts, and the middle part is hinged by bolts, and each steel plate can rotate around the hinge point; there are two sets of electric push rods corresponding to the bolts, which are arranged in parallel on the outside of the bolts, the fixed end is connected to the bolt through the ear plate, and the telescopic end can be slidably sleeved on the bolt through the ear plate, with both ends located outside the outer plates.

[0009] When the above technical solution is implemented, the diamond-shaped damping device further includes a hydraulic damper, and the two ends of the hydraulic damper are respectively connected to the corresponding inner side plates of the bolt through sleeves.

[0010] When the above technical solution is implemented, friction pads are respectively provided on both sides of the sleeve and between the inner steel plate and the outer steel plate on the bolt rod.

[0011] When the above technical solution is implemented, the length segment between the inner steel plates corresponding to the prestressed bolt is a smooth rod segment, a friction pad is provided between the inner steel plate and the outer steel plate corresponding to the prestressed bolt, and a limit nut is connected to the outer steel plate.

[0012] When the above technical solution is implemented, there are two upper arm rods symmetrically arranged with respect to the lower arm rod. The two upper arm rods are symmetrically connected to ear plates on their lower sides. The two ends of the prestressed bolts at the top of the diamond-shaped damping device pass through the ear plates and are connected to locking nuts.

[0013] When the above technical solution is implemented, the prestressed bolts at the bottom of the diamond-shaped damping device are connected to a U-shaped seat. The two ends of the prestressed bolts pass through the side walls of the U-shaped seat and are connected to locking nuts. The bottom surface of the U-shaped seat is connected and fixed to the lower arm rod.

[0014] When the above technical solution is implemented, the vibration isolation support component includes a vibration isolation support and a U-shaped rod. There are two vibration isolation supports, each including a connecting column, a damping cylinder and a spring. The damping cylinder includes a steel cylinder and an elastic vibration isolation sleeve lining it. The lower end of the steel cylinder is a closed end and the upper end is an open end. The spring is placed in the elastic vibration isolation sleeve. A retaining ring is provided in the middle of the connecting column, and the lower end is inserted into the elastic vibration isolation sleeve corresponding to the upper end of the spring. The two sides of the U-shaped rod are respectively connected to the center position of the bottom surface of the two steel cylinders.

[0015] When the above technical solution is implemented, the upper ends of the two connecting columns are symmetrically fixed to both ends of the bow head, and one end of the upper arm is connected to the U-shaped rod.

[0016] When the above technical solution is implemented, two acceleration sensors symmetrical about the center plane of the bow head are provided.

[0017] The main innovation of this invention is the diamond-shaped damping device installed between the upper and lower arms of the pantograph, the vibration isolation support component connected to the upper arm at the pantograph head, and the acceleration sensor installed at the pantograph head. The working principle is as follows: when the high-speed train is running on a smooth track, the diamond-shaped damping device does not function. When a high-speed train runs on an uneven track after an earthquake, the vibration between the pantograph and the contact wire increases significantly, and the acceleration at the pantograph head changes significantly. The acceleration sensor at the pantograph head can detect these changes. When the acceleration exceeds a specified range, the sensor transmits an electrical signal to the electric actuator of the diamond-shaped damping device. The telescopic rod of the electric actuator retracts, clamping the outer and inner steel plates of the diamond-shaped damping device, thus activating it. The distance between the two ends of the middle section of the diamond-shaped damping device changes, and the two ends of the inner and outer plates rotate around the prestressed bolts and tie rods, respectively. Simultaneously, the hydraulic damper between the two ends of the middle section engages, increasing frictional energy dissipation through the rotational friction between the steel plates and the friction pads, as well as the operation of the hydraulic damper, thereby improving the energy dissipation and vibration reduction effect of the structure. At the same time, the vibration isolation support at the pantograph head further reduces vibration, preventing large-amplitude vibrations of the pantograph when the high-speed train runs on the uneven track after an earthquake, thus improving the current collection quality of the pantograph.

[0018] In short, this invention uses a diamond-shaped damping device to dissipate the energy of vibrations caused by track deformation, thereby reducing the impact of train vibrations on the pantograph and contact wire. At the same time, the vibration isolation support at the pantograph head further isolates the pantograph head, thus ensuring stable contact between the pantograph head and the contact wire and ensuring good current collection by the pantograph. Attached Figure Description

[0019] Figure 1 This is a front view schematic diagram of an embodiment of the present invention.

[0020] Figure 2 for Figure 1 A diagram showing the view from the right.

[0021] Figure 3 for Figure 1 Axonometric schematic diagram.

[0022] Figure 4 for Figure 1 A top-down enlarged schematic diagram of the rhomboid damping device.

[0023] Figure 5 for Figure 2 Enlarged cross-sectional view of the vibration isolation support. Detailed Implementation

[0024] Combination Figures 1 to 3 It can be seen that:

[0025] The friction damping pantograph disclosed in this embodiment for use in post-earthquake track operation has a frame base 1 with a tie rod 2 and a lower arm 3 hinged to both sides of the longitudinal center. A lifting cylinder (not shown in the figure) is provided between the lower arm and the frame base. One end of the lifting spring 4 is hinged to the frame base 1, and the other end is hinged to the longitudinal rod connected to the tie rod 2.

[0026] Two upper arm rods 5 are arranged symmetrically about the lower arm rod 3. One end of the two upper arm rods is hinged to a pin. The upper end of the tie rod 2 is hinged to the pin. The end of the connecting rod hinged to the upper end of the lower arm rod 4 is also hinged to the pin.

[0027] Two accelerometers (CGQs) are symmetrically mounted on the front slide of the bow head 6.

[0028] Vibration isolation supports 7 are symmetrically connected to the lower ends of the bow head 6, and the two vibration isolation supports are connected by a U-shaped rod 8 parallel to the bow head slide plate.

[0029] The other end of the two upper arm rods 5 is connected to the U-shaped rod 8, and a balance bar 10 is provided between the U-shaped rod and the pin that is hinged to one end of the upper arm rod.

[0030] The innovative structures in the pantograph include: an acceleration sensor CGQ mounted on the pantograph head, a vibration isolation support 7, and a U-shaped rod 8 that connects the vibration isolation support into one unit.

[0031] All other structures are conventional.

[0032] Two vibration damping and isolation supports 7 and a U-shaped rod 8 constitute the vibration damping and isolation support component.

[0033] Combination Figures 1 to 3 and Figure 5 It can be known that:

[0034] The vibration isolation support 7 includes a connecting column 71, a vibration damping cylinder 72, and a spring 73.

[0035] The vibration damping cylinder 72 includes a steel cylinder 721 and an elastic vibration isolation sleeve 722 lining it. The lower end of the steel cylinder is a closed end and the upper end is an open end. The spring 73 is placed in the elastic vibration isolation sleeve 722. A retaining ring is provided in the middle of the connecting column 721, and the lower end is inserted into the upper end of the elastic vibration isolation sleeve corresponding to the spring.

[0036] The elastic vibration isolation sleeve 722 is made of high-damping elastic rubber material.

[0037] The two sides of the U-shaped rod 8 are respectively connected to the center of the bottom surface of the two steel cylinders.

[0038] When installing the vibration damping and isolation support components, the upper end of the connecting column 71 is welded and fixed to the bow head 6, and the welding positions at both ends are symmetrical about the center face of the bow head in the width direction.

[0039] The other end of the upper arm 5 is welded and fixed to the U-shaped rod 8.

[0040] The main innovation of this invention is the installation of a diamond-shaped damping device 9 between the upper arm 5 and the lower arm 3.

[0041] Combination Figures 1 to 3 and Figure 4 It can be seen that:

[0042] The rhomboid damping device 9 includes two sets of inner steel plates 91, two sets of outer steel plates 92, a hydraulic damper 93, and an electric push rod 94. Figures 1 to 3 Not shown in the image, in Figure 4 (as shown in the image).

[0043] Two sets of outer steel plates 92 are arranged to sandwich two sets of inner steel plates 91 to form a vertical rhombus. The top and bottom of the rhombus are hinged by prestressed bolts 95, and the middle part is hinged by bolts 96. Each steel plate can rotate around the hinge.

[0044] The length section between the prestressed bolt 95 and the inner steel plate 91 is a smooth section. A friction pad 97 is provided on the prestressed bolt between the inner steel plate 91 and the outer steel plate 92, and a limit nut is connected to the outer steel plate.

[0045] The two ends of the hydraulic damper 93 are respectively connected to the inner steel plates 91 on the bolt 96 through sleeves.

[0046] Friction pads 97 are respectively provided on both sides of the sleeve and between the inner steel plate 91 and the outer steel plate 92 on the bolt rod 96.

[0047] Friction pad 97 is made of polymer composite friction material.

[0048] The electric push rod 94 has two sets corresponding to the bolt rod 96, which are arranged in parallel on the outside of the bolt rod. The fixed end is connected to the bolt rod through the ear plate EB, and the telescopic end is slidably sleeved on the bolt rod through the ear plate EB. Both ends are located outside the outer steel plate 92, and the initial state of the telescopic end is not in contact with the outer steel plate 91.

[0049] The prestressed bolt 95 at the bottom of the diamond-shaped damping device 9 is connected to a U-shaped seat 98. The two ends of the prestressed bolt pass through the side wall of the U-shaped seat and are connected to a lock nut.

[0050] When installing the diamond-shaped damping device 9, ear plates are welded at designated positions on the lower side of the two upper arm rods 5. The two ends of the prestressed bolts 95 at the top of the diamond-shaped damping device pass through the ear plates and are connected to nuts. The bottom surface of the U-shaped seat 98 at the bottom is welded to the lower arm rod 4.

[0051] The rhomboid damping device of the pantograph is an important vibration reduction structure for high-speed trains running on uneven tracks after an earthquake. It isolates the pantograph head through the vibration isolation support component at the pantograph head.

[0052] The working principle of the pantograph mentioned above is as follows:

[0053] When a high-speed train is running on a smooth track, the diamond-shaped damping device does not function.

[0054] When a high-speed train runs on an uneven track after an earthquake, the vibration between the pantograph and the contact wire increases significantly, and the acceleration at the pantograph head changes significantly. The acceleration sensor at the pantograph head can detect the acceleration change. When the acceleration change exceeds the specified range, the acceleration sensor transmits an electrical signal to the electric push rod of the diamond-shaped damping device. The telescopic rod of the electric push rod retracts, clamping the outer and inner steel plates of the diamond-shaped damping device, causing the diamond-shaped damping device to work. The distance between the two ends of the middle part of the diamond-shaped damping device changes, and the two ends of the inner and outer plates rotate around the prestressed bolts and tie rods, respectively. At the same time, the hydraulic damper between the two ends of the middle part engages, increasing frictional energy dissipation through the rotational friction between the steel plates and the friction pads, as well as the operation of the hydraulic damper, thereby improving the energy dissipation and vibration reduction effect of the structure. Simultaneously, the vibration damping spring 73 and the elastic vibration isolation sleeve 722 of the vibration isolation support 7 at the pantograph head reduce vibration and prevent the pantograph from generating large-amplitude vibrations when the high-speed train runs on the uneven track after an earthquake, thereby improving the current collection quality of the pantograph.

[0055] In short, this invention uses a diamond-shaped damping device to dissipate the energy of vibrations caused by track deformation, thereby reducing the impact of train vibrations on the pantograph and contact wire. At the same time, the vibration isolation support at the pantograph head further isolates the pantograph head, thus ensuring stable contact between the pantograph head and the contact wire and ensuring good current collection by the pantograph.

Claims

1. A frictionally damped shock absorbing pantograph for post-earthquake on-track vehicles, characterized by: A vertically arranged diamond-shaped damping device is connected between its upper arm and lower arm. A vibration isolation support component is installed between its bow head and upper arm. An acceleration sensor is installed on the bow head. The rhomboid damping device includes two sets of inner steel plates, two sets of outer steel plates, and electric push rods. Each set of inner and outer steel plates includes two parallel steel plates. The two sets of outer steel plates sandwich the two sets of inner steel plates to form a vertical rhombus. The top and bottom of the rhombus are hinged by prestressed bolts, and the middle part is hinged by bolts. Each steel plate can rotate around the hinge. There are two sets of electric push rods corresponding to the bolts, which are arranged parallel to the outside of the bolts. The fixed end of the electric push rod is connected to the bolt through an ear plate, and the telescopic end of the electric push rod can be slidably sleeved on the bolt through an ear plate. The two ends of the electric push rod are located outside the outer steel plates. The rhomboid damping device also includes a hydraulic damper, the two ends of which are respectively connected to the corresponding inner steel plate section of the bolt rod through sleeves; The vibration isolation support component includes a vibration isolation support and a U-shaped rod. There are two vibration isolation supports, each including a connecting column, a damping cylinder, and a spring. The damping cylinder includes a steel cylinder and an elastic vibration isolation sleeve lining it. The lower end of the steel cylinder is a closed end, and the upper end of the steel cylinder is an open end. The spring is placed in the elastic vibration isolation sleeve. A retaining ring is provided in the middle of the connecting column. The lower end of the steel cylinder is inserted into the elastic vibration isolation sleeve corresponding to the upper end of the spring. The two sides of the U-shaped rod are respectively connected to the center position of the bottom surface of the two steel cylinders.

2. The frictionally damped shock absorbing pantograph for post-earthquake on-track movement as claimed in claim 1 wherein: Friction pads are provided on both sides of the sleeve and between the inner and outer steel plates on the bolt rod.

3. The frictionally damped shock absorbing pantograph for post-earthquake on-track movement as claimed in claim 1 wherein: The length segment between the inner and outer steel plates corresponding to the prestressed bolt is a smooth rod segment. Friction pads are provided between the inner and outer steel plates corresponding to the prestressed bolt, and a limit nut is connected to the outer steel plate.

4. The frictionally damped shock absorbing pantograph for post-earthquake on-track travel as claimed in claim 1 wherein: The upper arm has two arms symmetrically arranged with respect to the lower arm. The two upper arms are symmetrically connected to ear plates on their lower sides. The prestressed bolts at the top of the diamond-shaped damping device pass through the ear plates and are connected to lock nuts.

5. The frictionally damped shock absorbing pantograph for post-earthquake on-track travel as claimed in claim 1 wherein: The prestressed bolts at the bottom of the diamond-shaped damping device are connected to a U-shaped seat. The two ends of the prestressed bolts pass through the side walls of the U-shaped seat and are connected to lock nuts. The bottom surface of the U-shaped seat is connected and fixed to the lower arm.

6. The frictionally damped shock absorbing pantograph for post-earthquake on-track travel according to claim 1, characterized in that: The upper ends of the two connecting columns are symmetrically fixed to both ends of the bow head, and one end of the upper arm is connected to the U-shaped rod.

7. The frictionally damped shock absorbing pantograph for post-earthquake on-track travel according to claim 1, characterized in that: The bow head is equipped with two acceleration sensors that are symmetrical about the center plane of its width direction.

Images