Electrically-driven pantograph lifting device for pantograph of railway vehicle

Abstract

The invention relates to an electrically-driven pantograph lifting device for a pantograph of a railway vehicle, and the device comprises a bottom frame which is arranged on a vehicle roof; the rod seat is rotationally arranged on the bottom frame; one end of the lower arm rod is connected with the rod seat, the other end of the lower arm rod is connected with a connecting rod assembly, and the other end of the connecting rod assembly is provided with a bow body; the mounting base is arranged on one side of the bottom frame, and a driving assembly is fixed to the mounting base; one end of the inhaul cable is connected with the rod seat, and the other end of the inhaul cable is connected with the movable end of the driving assembly through a spring; the worm and gear reducer is driven by the servo motor to drive the nut to rotate, the screw matched with the nut axially moves to pull the spring and the steel cable, and then the upper and lower arm rods and the upper and lower guide rods are rotated to achieve the pantograph lifting action of the pantograph. Mechanical self-locking of the pantograph lifting device is achieved through the worm gear reducer, and electrifying is not needed after pantograph lifting. Rapid pantograph descending under the fault working condition is achieved through the electromagnetic clutch; vibration of the pantograph net is isolated and buffered through the springs, and the service life of the electrically-driven pantograph lifting device is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high-voltage current collection equipment for rail transit, in particular to an electrically-driven pantograph lifting device for a rail vehicle. BACKGROUND

[0002] With the continuous iteration of rail transit vehicle technology, emerging technologies such as electromechanical braking systems, electric doors, and electric air horns have gradually replaced traditional air braking systems, pneumatic sliding doors, and pneumatic air horns. The "full electrification" of rail vehicles has become a clear new direction for the industry. This trend further requires the simultaneous replacement of power for the remaining pneumatic components of rail vehicles, with the ultimate goal of eliminating air compressors to reduce vehicle weight and improve operational efficiency.

[0003] As a core component of high-voltage current collection equipment for rail vehicles, the core function of the pantograph is to introduce the power of the overhead contact system into the locomotive and vehicle to power the traction system of the entire train. The current pantographs used in the railway field mostly use air bag pantograph technology — using compressed air as a power source, the air bag expands to generate thrust when the pantograph is lifted, and then the power is transmitted to the pantograph arm and slide plate through a mechanical transmission mechanism such as a lever, ultimately completing the lifting action.

[0004] However, electrically-driven pantographs differ significantly from existing air bag pantographs in terms of power source and structural design, so electrically-driven pantograph lifting devices suitable for fully-electrified rail vehicles are still in development.

[0005] After searching, it was found that Chinese patent application (publication number: CN202410043984.5) proposes an actively controlled electrically-driven electric highway pantograph. The pantograph mainly consists of a pantograph base, left and right symmetrical lifting pantograph assemblies, and a pantograph head. The lifting pantograph assembly is directly driven by an electric push rod, and the pantograph head is lifted through the coordinated action of the upper pantograph arm, the lower pantograph arm, and the lower pantograph arm link, with the characteristics of simple structure and small installation space required.

[0006] However, in-depth analysis shows that the electrically-driven electric highway pantograph has the following three defects: 1. Self-locking and emergency failure defects: The electrically-driven pantograph lifting device relies on an electric push rod for driving, and needs to be continuously powered after lifting to maintain the thrust, and cannot achieve mechanical self-locking. In the event of a power failure, it cannot complete the rapid lowering operation, posing a safety hazard.

[0007] 2. Lack of vibration damping capability: The transmission path from the pantograph head to the electric push rod is designed as a hard connection, which cannot dampen the vibrations generated by the pantograph system during vehicle operation, which can easily damage the internal screw pair of the electric push rod due to vibration impact, reducing the service life of the equipment.

[0008] 3. Insufficient application scene adaptability: The pantograph is designed to adapt to highway driving environment, and it is difficult to meet the core requirements of rail transit vehicles such as "high-speed operation, high load flow, wide area harsh environment tolerance, and complex line adaptation", and cannot be directly applied to rail scenes.

[0009] In summary, how to realize the self-locking of the pantograph in the lifting process, the automatic lowering of the pantograph after failure, and the elastic contact of the pantograph to prolong the service life of the electric drive pantograph lifting device has become a problem that researchers in the field urgently need to solve. SUMMARY

[0010] The technical problem to be solved by the present application is: how to realize the self-locking of the pantograph in the lifting process, the automatic lowering of the pantograph after failure, and the elastic contact of the pantograph to prolong the service life of the electric drive pantograph lifting device has become a problem that researchers in the field urgently need to solve.

[0011] To solve the above technical problems, the technical scheme adopted by the present application is: The present application is an electric drive pantograph lifting device for rail vehicles, comprising: a chassis arranged on the roof of the vehicle; a rod seat rotatably arranged on the chassis; a lower arm rod having one end connected to the rod seat and the other end connected to a connecting rod assembly, the other end of the connecting rod assembly being provided with a pantograph body; a mounting seat arranged on one side of the chassis, a driving assembly being fixed to the mounting seat; a cable having one end connected to the rod seat and the other end connected to the movable end of the driving assembly through a spring.

[0012] Further, the driving assembly comprises: an electric motor fixed to the horizontal plate of the mounting seat; a worm gear reducer connected to the output end of the electric motor; a nut rotatably arranged on the vertical plate of the mounting seat; an electromagnetic clutch, one end of the nut being fixedly connected to the electromagnetic clutch, the other end of the electromagnetic clutch being connected to the output end of the worm gear reducer, the electromagnetic clutch being connected to power and disconnected when power is lost; a screw rod having one end threadedly connected to the nut and the other end connected to the spring.

[0013] Further, the chassis is provided with a hinge seat on both sides; the rod seat is provided with a connecting portion rotatably matched with the hinge seat.

[0014] Further, the connecting rod assembly comprises: an upper arm rod having one end of the bottom portion connected to one end of the top portion of the lower arm rod, one end of the top portion of the upper arm rod being hingedly connected to a pantograph seat fixedly connected to the pantograph body; a first guide rod having one end hingedly connected to a connecting rod on the chassis and the other end hingedly connected to an ear at the end of the upper arm rod; and a second guide rod having one end hingedly connected to the top portion of the lower arm rod and the other end hingedly connected to the pantograph seat.

[0015] Further, a guide piece is fixed at the bottom of the rod seat, a guide groove is formed in the profile of the guide piece; the inhaul cable is wound in the guide groove, the end of the inhaul cable is provided with a protruding part, and the guide piece is provided with a buckle for clamping the protruding part.

[0016] Further, the part of the guide piece where the guide groove is formed is a continuous arc segment.

[0017] The present application has the following beneficial effects: the present application is a rail vehicle pantograph electric drive pantograph lifting device, which drives a nut to rotate through a servo motor and a worm gear reducer, drives a screw rod to move axially to pull a spring and a cable, and then rotates an upper and lower arm rod and an upper and lower guide rod to realize the lifting and lowering of the pantograph. The worm gear reducer realizes the mechanical self-locking of the pantograph lifting device, and no power is needed after the pantograph is lifted. The electromagnetic clutch realizes the rapid lowering of the pantograph in a fault condition. The spring isolates and buffers the pantograph vibration, prolongs the service life of the electric drive pantograph lifting device, and maintains the constant pantograph contact force. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be further described below in combination with the drawings and embodiments.

[0019] Figure 1 is a structural schematic diagram of the present embodiment; Figure 2 is an enlarged view of A of Figure 1 ; Figure 3 is a structural schematic diagram of another view of the present embodiment; Figure 4 is an enlarged view of B of Figure 3 ; Figure 5 is a structural schematic diagram of the cooperation of the guide piece and the inhaul cable. DETAILED DESCRIPTION

[0020] The present application will be further described below in combination with the drawings and embodiments. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the present application in a schematic manner, and thus only show the components related to the present application.

[0021] participate Figure 1 , 3 , the present embodiment is a rail vehicle pantograph electric drive pantograph lifting device, which comprises: a chassis 1 arranged on the roof of the vehicle; a rod seat 2 rotatably arranged on the chassis 1; a lower arm rod 3, one end of the bottom of which is connected with the rod seat 2, the other end of which extends obliquely upward and is connected with a connecting rod assembly 4, the other end of the connecting rod assembly 4 is provided with a pantograph body 5; a mounting seat 6 is arranged on the right side of the chassis 1, a driving assembly 7 is fixed on the mounting seat 6; one end of the left side of an inhaul cable 8 is connected with the rod seat 2, the other end of the right side of the inhaul cable 8 is connected with the movable end of the driving assembly 7 through a spring 9; In the embodiment, the driving assembly 7 is started, the rope 8 is pulled to the right, the lower arm rod 3 is moved from the inclined state to the vertical state, the lifting of the arch body 5 is realized under the driving of the connecting rod assembly 4, the spring 9 is arranged between the driving assembly 7 and the rope 8, the axial compression force of the spring 9 is utilized, the arch body 5 can be elastically moved up and down along the pantograph to maintain the constant contact force between the arch body 5 and the pantograph, and the service life of the electric drive lifting arch device is prolonged.

[0022] In some possible embodiments, the driving assembly 7 comprises a servo motor 71 fixed on the horizontal plate 62 of the mounting base 6, a worm gear reducer 72 connected with the output end of the motor 71, a nut 73 rotatably arranged on the vertical plate 61 of the mounting base 6 through a bearing, one end of the right side of the nut 73 fixedly connected with an electromagnetic clutch 74 through a bolt, the input end of the electromagnetic clutch 74 connected with the output end of the worm gear reducer 72, and a screw rod 75 with the right end threadedly connected with the nut 73 and the left end connected with the spring 9. In the embodiment, the servo motor 71 is started, the rotating force is transmitted to the nut 73 through the worm gear reducer 72 and the electromagnetic clutch 74, the nut 73 rotates to drive the screw rod 75 to move axially, and then the rope 9 is pulled to the right to drive the arch body 5 to rise; since the worm gear reducer 72 is adopted in the scheme, the self-locking function of the device is realized. In addition, the nut 73 passes through the mounting base 6 and is connected with one end of the electromagnetic clutch 74 through a bolt, the other end of the electromagnetic clutch 74 is inserted into the worm shaft hole of the worm gear reducer 72, the electromagnetic clutch 74 is connected with power, the rotating force of the servo motor 71 can be transmitted to the screw rod 75 to realize the lifting of the arch body 5; when a fault occurs, the electromagnetic clutch 74 is disconnected by losing power, after losing power, the screw rod 75 drives the nut 73 to rotate reversely due to the weight of the arch body, and the arch body 5 is rapidly lowered under the action of the weight.

[0023] The power of the servo motor 71 is preferably 400 W, the output rotating speed is not less than 3000 rpm, the reduction ratio of the worm gear reducer 72 is not less than 30, and the worm gear reducer 72 can be mechanically self-locked; the pulling force of the screw rod 75 is not less than 15 kN, the axial movement speed is not less than 10 mm / s, and the stroke is not less than 50 mm.

[0024] Participation Figure 2 In some possible embodiments, how to realize the rotation of the rod seat, the embodiment adopts the hinged seats 11 arranged on both sides of the chassis 1; the rod seat 2 is provided with the connecting parts 21 rotationally matched with the hinged seats 11. In the embodiment, the rod seat 2 is rotationally connected with the hinged seats 11 through the connecting parts 21, the rotation of the rod seat 2 relative to the chassis 1 is realized, and then the lifting of the arch body 5 is realized.

[0025] Participation Figure 1 ,3 , 4, in some possible embodiments, the connecting rod assembly 4 comprises: the bottom end of the upper arm rod 41 is connected with the top end of the lower arm rod 3, the top end of the upper arm rod 41 is hinged with the arch seat 42 fixedly connected with the arch body 5; the bottom end of the first guide rod 43 is hinged with the length direction connecting rod 12 on the chassis 1, and the top end of the first guide rod 43 is hinged with the lug at the end of the upper arm rod 41; the bottom end of the second guide rod 44 is hinged with the top of the lower arm rod 3, and the top end of the second guide rod 44 is hinged with the arch seat 42; In this embodiment, the first guide rod 43 is used to adjust the maximum rising height of the arch body 5, and the second guide rod 44 is used to adjust the rotation angle of the arch seat 42, so that the arch body 5 is always in a horizontal state to contact the pantograph.

[0026] Participate Figure 5 In some possible embodiments, a guide 22 is fixed at the bottom of the rod seat 2, and a guide groove 23 is formed at the bottom profile of the guide 22; the cable 8 is wound in the guide groove 23, the end of the cable 8 is provided with a protruding part 81, and the guide 22 is provided with a buckle 24 for clamping the protruding part 81; In this embodiment, the cable 8 is wound in the guide groove 23 of the guide, the left end of the cable 8 is provided with a protruding part 81, and the protruding part 81 is limited by the buckle 24 arranged opposite to the guide 22, so that the cable 8 is fixedly connected with the rod seat 2.

[0027] Participate Figure 5 In some possible embodiments, the part of the guide 22 where the guide groove 23 is formed is a continuous arc segment; In this embodiment, the guide 22 rotates with the rod seat 2, and the guide groove 23 is provided with a connected arc segment, so that the arch body 5 can be stably and gradually lifted.

[0028] In summary, first of all, the device contains a worm gear reducer 72 driven by a servo motor 71, which can realize mechanical self-locking, and does not need to be powered after lifting the bow to protect the motor, avoiding the motor always working in the blocked state, while ensuring the reliability of the lifting position; Secondly, the electromagnetic clutch 74 is arranged on the transmission path of the device, and the pantograph can realize rapid lowering of the arch body under the action of its own weight in the case of power failure and other faults; Finally, the device is provided with a spring 9, which can isolate and buffer the pantograph vibration under the high-speed and complex running conditions of the rail vehicle, effectively protect the transmission parts of the lifting device, prolong the service life, and maintain the constant pantograph contact force.

[0029] With the above ideal embodiments according to the present application as the inspiration, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A pantograph-driven pantograph lifting device for rail vehicles, characterized in that, include: The underframe is mounted on the roof of the vehicle; A rod holder, which is rotatably mounted on the base frame; The lower arm has one end connected to the arm seat and the other end connected to the connecting rod assembly, the other end of which is provided with an arch body; A mounting base is provided on one side of the base frame, and the drive assembly is fixed on the mounting base; The cable has one end connected to the rod seat and the other end connected to the movable end of the drive assembly via a spring.

2. The pantograph-driven pantograph lifting device for rail vehicles according to claim 1, characterized in that, The driving component includes: The motor is fixed to the horizontal plate of the mounting base; A worm gear reducer, which is connected to the output end of the motor; A nut, which is rotatably mounted on the vertical plate of the mounting base; An electromagnetic clutch is provided, wherein one end of the nut is fixedly connected to the electromagnetic clutch, and the other end of the electromagnetic clutch is connected to the output end of the worm gear reducer. The electromagnetic clutch is energized and de-energized. The screw has one end threadedly connected to the nut and the other end connected to the spring.

3. The pantograph-driven pantograph lifting device for rail vehicles according to claim 1, characterized in that, Hinges are provided on both sides of the base frame; Both ends of the rod seat are provided with connecting parts that rotatably engage with the hinge seat.

4. The pantograph-driven pantograph lifting device for rail vehicles according to claim 1, characterized in that, The linkage assembly includes: The upper arm has a bottom end that meets the top end of the lower arm, and the top end of the upper arm is hinged to a bow seat that is fixedly connected to the bow body. The first guide rod has one end hinged to the connecting rod on the base frame and the other end hinged to the lug at the end of the upper arm rod; The second guide rod has one end hinged to the top of the lower arm and the other end hinged to the bow seat.

5. The pantograph electric drive lifting device for rail vehicles according to claim 1, characterized in that, A guide member is fixed at the bottom of the rod base, and a guide groove is provided at the bottom contour of the guide member; The cable is wound inside the guide groove, and the end of the cable is provided with a protrusion. The guide is provided with a buckle that engages the protrusion.

6. The pantograph electric drive lifting device for rail vehicles according to claim 5, characterized in that, The portion of the guide member with the guide groove is a continuous arc-shaped segment.

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