Lifting structure for pantograph

Abstract

The invention belongs to the technical field of pantographs, and particularly relates to a lifting structure for a pantograph. The pantograph seat is arranged on the base in a lifting manner and is used for mounting a pantograph; the connecting rod structure is used for connecting the base and the pantograph seat; the damping adjustable telescopic structure is arranged in the connecting rod structure and used for buffering when the connecting rod structure stretches or folds, the damping adjustable telescopic structure is filled with magnetic fluid, the magnetic fluid is magnetically connected with an elastic electromagnetic part, and the elastic electromagnetic part is arranged between the base and the pantograph seat; the driving part is used for driving the connecting rod structure to stretch or fold, and the driving part is arranged on the base. The device generates a magnetic field through the elastic electromagnetic part, and the magnetofluid changes the viscosity under the action of the magnetic field so as to realize resistance change.

Description

Technical Field

[0001] The invention belongs to the technical field of pantographs, and in particular relates to a lifting structure for a pantograph. Background Art

[0002] The pantograph (also known as the electric receiver) is an electrical device installed on the roof of the locomotive or EMU for electric traction locomotives to obtain electric energy from the contact network. The pantograph can be divided into four categories: double-arm type, single-arm type, vertical type and Ishizu type. Both single-arm and double-arm pantographs are composed of a slide plate, an upper frame, a lower arm rod (a lower frame for double-arm pantographs), a bottom frame, a pantograph spring, a transmission cylinder, a supporting insulator and other components. The rhombus pantograph, also known as the diamond pantograph, was very common in the past, but was gradually eliminated due to its high maintenance cost and the fact that it was easy to break the contact network in case of a fault. In recent years, single-arm pantographs have been mostly used, but the existing single-arm pantographs are basically driven by springs and pull ropes. The contact and buffering between the pantograph and the conductor are derived from the elasticity of the spring. During the movement, since the pantograph needs to maintain contact with the conductor, a damping structure is required to avoid separation or excessive squeezing of the pantograph and the conductor caused by too rapid expansion and contraction of the spring. In traditional technologies, the damping degree of the damping structure cannot be changed according to actual road conditions. Therefore, a lifting structure for the pantograph is urgently needed to solve this problem. Summary of the invention

[0003] The object of the present invention is to provide a lifting structure for a pantograph to solve the above-mentioned problems.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A lifting structure for a pantograph, comprising:

[0006] Base;

[0007] A pantograph seat, which is escalable and arranged on the base, and is used for installing the pantograph;

[0008] A connecting rod structure, used for connecting the base and the pantograph seat;

[0009] A damping adjustable telescopic structure is arranged in the connecting rod structure and is used for buffering when the connecting rod structure is extended or folded. The damping adjustable telescopic structure is filled with magnetic fluid, and the magnetic fluid is magnetically connected to an elastic electromagnetic part, and the elastic electromagnetic part is arranged between the base and the pantograph seat;

[0010] A driving unit is used to drive the connecting rod structure to extend or fold, and the driving unit is arranged on the base.

[0011] Optionally, the connecting rod structure includes a first connecting rod portion and two second connecting rod portions, and the two second connecting rod portions are symmetrically arranged on the front and rear sides of the base;

[0012] The first connecting rod portion is arranged between two of the second connecting rod portions;

[0013] The two second connecting rod parts are located on one side of the pantograph, and the first connecting rod part is located on the other side of the pantograph;

[0014] The driving portion is transmission-connected to the first connecting rod portion.

[0015] Optionally, the first connecting rod portion includes a third rod and a fourth rod hinged to each other, one end of the third rod away from the fourth rod is hinged to the bottom of the pantograph seat, and one end of the fourth rod away from the third rod is hinged to the top of the base;

[0016] A second damping-adjustable telescopic rod is provided between the third rod and the fourth rod, one end of the second damping-adjustable telescopic rod is hinged to the middle of the third rod, and the other end of the second damping-adjustable telescopic rod is hinged to the middle of the fourth rod;

[0017] The fourth rod is transmission-connected to the driving part.

[0018] Optionally, the second connecting rod portion includes a first rod and a second rod hinged to each other, an end of the first rod away from the second rod is hinged to the top of the base, and an end of the second rod away from the first rod is hinged to the bottom of the pantograph seat;

[0019] A first damping-adjustable telescopic rod is provided between the first rod and the second rod, one end of the first damping-adjustable telescopic rod is hinged to the middle of the first rod, and the other end of the first damping-adjustable telescopic rod is hinged to the middle of the second rod;

[0020] The first damping-adjustable telescopic rod and the second damping-adjustable telescopic rod have exactly the same structure.

[0021] Optionally, the first damping adjustable telescopic rod comprises:

[0022] A sleeve, wherein a spacer ring is axially connected to the inner side of the middle part of the sleeve, and the spacer ring separates the sleeve into a sliding cavity located at the top and a magnetic fluid temporary storage cavity located at the bottom, and the magnetic fluid is filled in the sliding cavity and the magnetic fluid temporary storage cavity, and a sealing ring is axially connected to the inner side of the top of the sliding cavity;

[0023] A sliding ring is slidably arranged in the sliding cavity, and the sliding ring is provided with a plurality of through holes for the passage of magnetic fluid at equal intervals in the circumferential direction;

[0024] One end of the sliding rod is axially connected to the sliding ring, and the other end of the sliding rod penetrates the sealing ring.

[0025] Optionally, the elastic electromagnetic part includes a second telescopic rod, both ends of the second telescopic rod are respectively fixedly connected with magnetic coil grooves, and the magnetic coil grooves are fixedly connected to the corresponding bottom of the pantograph seat or the top of the base;

[0026] The outer sleeve of the second telescopic rod is provided with a magnetic coil in the form of a spring, and the magnetic coil is used to provide elasticity and an electromagnetic field.

[0027] Optionally, the driving part includes a telescopic rod, one end of the telescopic rod is hinged to the middle part of the fourth rod, and the other end of the telescopic rod is hinged to the base;

[0028] The hinge axis between the telescopic rod and the base is connected with the output shaft of the rotary motor, and the fixed end of the rotary motor is fixedly connected to the base.

[0029] Compared with the prior art, the present invention has the following advantages and technical effects:

[0030] When in use, the driving part drives the connecting rod structure to extend, so that the pantograph seat rises. At this time, the pantograph contacts the bottom of the conductor, and the elastic electromagnetic part provides contact force between the pantograph and the conductor. In the process of the pantograph moving along the conductor, the pantograph changes with the height of the conductor, and the length of the damping-adjustable telescopic structure changes. When the damping-adjustable telescopic structure changes in telescopicity, the magnetic fluid provides resistance to the change in telescopicity, and a magnetic field is generated through the elastic electromagnetic part. The magnetic fluid changes its viscosity under the action of the magnetic field to achieve resistance change. Based on this, the damping of the telescopic structure is adjustable, and the damping size can be adaptively adjusted according to different road conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0032] Figure 1 This is a front view of the structure of the present invention;

[0033] Figure 2 It is a side view of the structure of the present invention;

[0034] Figure 3 This is a structural diagram of the first damping adjustable telescopic rod of the present invention;

[0035] Figure 4 For the present invention Figure 3 A partial enlarged view of the middle part;

[0036] Among them, 1. base; 2. first rod; 3. second rod; 4. first damping adjustable telescopic rod; 5. pantograph; 6. pantograph seat; 7. magnetic coil slot; 8. magnetic coil; 9. third rod; 10. fourth rod; 11. second damping adjustable telescopic rod; 12. telescopic rod; 13. rotating motor; 14. second telescopic rod; 401. sleeve; 402. spacer ring; 403. sliding cavity; 404. magnetic fluid temporary storage cavity; 405. sliding rod; 406. sealing ring; 407. sliding ring; 408. through hole. DETAILED DESCRIPTION

[0037] In the prior art, there is a buffered lifting pantograph, which includes a base, a lifting arm and a pantograph head. The upper end of the lifting arm is connected to the pantograph head. The central shaft at the lower end of the lifting arm is rotatably mounted on the base. A spring pantograph raising device and a pantograph lowering cylinder are arranged between the central shaft and the base to drive the central shaft to rotate. The spring pantograph raising device overcomes the damping buffering force generated by the intake and exhaust throttling of the pantograph lowering cylinder to drive the pantograph raising. The pressure gas introduced into the pantograph lowering cylinder overcomes the damping buffering force and the action force of the spring pantograph raising device to push out the piston rod to drive the pantograph lowering. When the pantograph is raised, the spring pantograph raising device provides the pantograph raising power, and the pantograph lowering cylinder becomes the pantograph raising damping. When the pantograph is lowered, the pantograph lowering cylinder provides the pantograph lowering power, and the spring pantograph raising device becomes the pantograph lowering damping. At the same time, since the intake and exhaust throttling can form the damping buffering force when the pantograph lowering cylinder is inhaled and exhausted, there is an obvious pause in the pantograph lowering process. Thus, the pantograph raising and lowering driving structure of the buffered lifting pantograph is simple in design, easy to assemble and maintain, and can effectively control the manufacturing and assembly costs. The bow lowering cylinder is a pre-shrink single-acting cylinder, and the piston rod of the bow lowering cylinder is reset and returned by the force of the spring bow raising device. Since the bow lowering cylinder is a pre-shrink single-acting cylinder, when lowering the bow, pressurized gas is introduced to push out the piston rod to drive the bow lowering, and when raising the bow, the air is exhausted and reset under the force of the spring bow raising device. The inner chamber of the bow lowering cylinder is divided into a rod chamber and a rodless chamber by the piston. The rod chamber is connected to the atmosphere through the limiting hole B, and the rodless chamber is connected to the throttling gas path through the limiting hole A. The limiting hole A and the limiting hole B cooperate to limit the speed, so that the exhaust side of the bow lowering cylinder forms a damping buffer force generated by the intake and exhaust throttling. The damping buffer force is greater than the power on the intake side of the bow lowering cylinder at the beginning of the piston movement, and the damping buffer force gradually decreases with the exhaust on the exhaust side and tends to a stable value. During the movement of the piston, the rodless chamber and the rod chamber are alternately inlet and exhaust through the limiting hole A and the limiting hole B respectively. The limiting holes A and the limiting holes B limit the speed to form the inlet and outlet throttling, so that there is a gas pressure difference between the two chambers of the bow lowering cylinder that hinders the movement of the piston, and the exhaust side of the bow lowering cylinder forms a damping buffer force; with the exhaust of the exhaust side and the intake of the intake side, the damping buffer force gradually decreases until the gas pressure of the rodless chamber and the rod chamber enters a dynamic equilibrium state, the piston begins to move under the action of the combined force, the damping buffer force tends to approach the stable value, and the piston movement transitions from rapid acceleration to nearly uniform speed. The buffered lifting pantograph of the present invention can transition from rapid acceleration to nearly uniform speed raising or uniform speed lowering under the regulation of the bow lowering cylinder, with high stability, and can avoid the problems of the raising pantograph hitting the net and the lowering pantograph hitting the top. The throttling air circuit includes a high-pressure air release circuit and an air inlet and return air circuit respectively connected to the flow limiting hole A. The high-pressure air release circuit and the air inlet and return air circuit are connected to the main circuit through an air pressure valve. The high-pressure air release circuit is unidirectionally connected to the main circuit, and the main circuit is unidirectionally connected to the air inlet and return air circuit. The high-pressure air release circuit is provided with a return valve for adjusting the exhaust speed of the rodless chamber.The inlet and return air paths of the rodless chamber are separated from the high-pressure air release path, and a return air valve is set on the high-pressure air release path. When the pantograph lowering cylinder is inflated, the rod chamber is the exhaust side, and the pressure gas enters the rodless chamber from the inlet and return air path. The rod chamber is connected to the atmosphere through the flow limiting hole B, and the flow limiting holes A and B cooperate with the inlet and return air path to perform intake and exhaust throttling; when the pantograph lowering cylinder is exhausted, the rodless chamber is the exhaust side, and the gas in the rodless chamber is discharged through the flow limiting hole A and the return air valve on the high-pressure air release path. The flow limiting holes A and B cooperate with the high-pressure air release path to perform intake and exhaust throttling. In order to perform the intake and exhaust conversion of the rodless chamber, the main path is connected to the gas source and the atmosphere respectively through the electromagnetic reversing valve; wherein, the main path is connected to the gas source when the electromagnetic reversing valve is energized, and the main path is connected to the atmosphere when the electromagnetic reversing valve is de-energized. In order to optimize the structural layout of the pantograph, the spring pantograph raising device and the pantograph lowering cylinder are located on the same side of the central shaft axis. The piston rod of the bow lowering cylinder is pushed and matched with the transmission plate assembly arranged on the central rotating shaft. Among them, the transmission plate assembly includes a transmission plate fixed on the central rotating shaft, and a roller rotatably connected to the transmission plate, and the piston rod of the bow lowering cylinder is pushed and matched with the roller. The piston rod of the bow lowering cylinder and the transmission plate assembly are push-fitted in a contacting manner, and the sliding friction between the piston rod and the transmission plate assembly is converted into rolling friction by the roller, which can effectively reduce wear. The spring bow raising device includes a main spring and a transmission chain. The fixed end of the main spring is installed on the base, and the movable end of the main spring is connected to a cam installed on the central rotating shaft through a transmission chain. Among them, the main spring is a tension spring. The tension spring has stable mechanical properties and can stably provide bow raising power and bow lowering resistance. The buffered lifting pantograph of the above scheme uses a spring bow raising device to provide bow raising power, and a bow lowering cylinder to provide bow lowering power. At the same time, the damping buffer force on the exhaust side of the bow lowering cylinder becomes damping during the bow raising process, and the action force of the spring bow raising device becomes damping during the bow lowering process, so that the spring bow raising device and the bow lowering cylinder are alternately used as power and damping, simplifying the structural design and reducing the design and assembly costs. Compared with the prior art that requires continuous air supply in the air circuit during vehicle operation, the bow lowering cylinder of the present invention is used in the vehicle. During operation, the bow is connected to the atmosphere for exhaust, so that the force of the spring bow raising device is dominant, and the bow can be raised. No air supply is required during vehicle operation. Compared with the prior art, which exhibits a speed-changing movement that is first fast and then slow during bow raising and lowering, the present invention can achieve a bow raising action that is first fast, then buffered, and finally rising at a uniform speed through the cooperation of the spring bow raising device and the throttling air circuit. It can also achieve a bow lowering action that is first fast, then paused, and finally falling at a uniform speed through the cooperation of the bow lowering cylinder device and the throttling air circuit. The bow raising speed can be adjusted by controlling the return valve, and the bow lowering speed can be adjusted by controlling the pressure gas exhaust speed. The stability and controllability are high.

[0038] In another technical solution, a pantograph includes a base frame, a lower arm mounted on the base frame, an upper arm hinged to the lower arm, a pull rod hinged at one end to the lower end of the upper arm and hinged at the other end to the base frame, a bow lifting drive device, and a bow head, the bow head including a bow angle, a bow head rotating shaft, an elastic buffer device connected to both ends of the bow head rotating shaft, a slide plate spanning the elastic buffer device at both ends of the bow head rotating shaft and fixedly connected to the elastic buffer device, a connecting portion extending from the upper end of the upper arm, the connecting portion is hinged to the bow head rotating shaft, the length of the connection position between the bow head rotating shaft and the connecting portion and the slide plate is less than the length of the connection between the bow head rotating shaft and the elastic buffer device and the slide plate; it also includes a balance rod system located directly below the upper arm, the balance rod system includes a first rod hinged to the upper end of the lower arm, a second rod hinged to the upper end of the upper arm, a fourth rod hinged to the bow head rotating shaft, a third rod hinged at one end to the free end of the second rod and at the other end to the free end of the fourth rod; the other end of the first rod is hinged to the middle of the second rod.

[0039] In the above scheme, the connection point between the bow head rotating shaft and the upper arm is moved upward, so that the distance between the connection point with the upper arm and the slide plate is reduced, which can reduce the distance between the bow head rotation axis and the bow head mass center, thereby reducing the bow head torque used to keep the bow head vertical, thereby reducing the force on the balance bar system and improving the fatigue life of the balance bar system. At the same time, the reduction in distance can also reduce the air lift force of the slide plate, thereby reducing the force on components such as the elastic buffer device and improving the fatigue life of the structural components. At the same time, the use of a multi-link balance bar system with a multi-stage design instead of a traditional straight balance bar structure can keep the bow head rotation angle basically unchanged during the pantograph raising and lowering process, so that the pantograph slide plate remains horizontal.

[0040] The bow head shaft is a π-shaped structure, including a hollow middle tube, a curved segment fixedly connected to the tube wall at both ends of the middle tube, the two ends of the curved segment are connected to the elastic buffer device, and the middle tube is connected to the connecting part; the length of the connection position between the middle tube and the connecting part and the slide plate is less than the length of the connection between the curved segment and the elastic buffer device and the slide plate. The first rod is located directly below the upper arm, and the hinge position of the fourth rod and the bow head shaft is located in the middle of the middle tube. Hiding the first rod directly below the upper arm can effectively reduce wind resistance during high-speed driving. During the process of raising and lowering the pantograph, the fourth rod maintains approximate translation, and the angle of the fourth rod relative to the initial position of the fourth rod is in the range of -0.5 to 0.5 degrees. The so-called approximate translation means that the fourth rod maintains a very small deflection angle when moving. The connecting part is a pair of curved parts fixed on the upper end of the upper arm and arranged symmetrically. The connecting part and the upper arm rod body together form a Y-shaped structure. The end of the curved part is provided with a connection seat with a hole. The connection seats with a hole are distributed at both ends of the intermediate tube, and the distance between the two connection seats with a hole is equal to the length of the intermediate tube. The bolt passes through the inner cavity of the connection seat with a hole and the intermediate tube in turn, and the curved part is hinged with the bow head rotating shaft. The intermediate tube can rotate around the bolt. The connection part of the intermediate tube and the upper end of the upper arm forms a triangular structure, thereby ensuring the stability of the structure and effectively improving the lateral stiffness of the structure after the upper arm and the bow head are connected. In addition, the use of a bolt through-type connection can ensure sufficient structural strength and effectively ensure that the components will not fall off when a foreign object hits. Engineering plastic bushings are pressed on both ends of the intermediate tube. The use of engineering plastic bushings instead of the previous powder metallurgy bushings solves the problem that the processing technology of this type of bushing is difficult to control and is easy to break during use. The bolt and the connection seat with a hole are pre-tightened by a nut to limit the rotation of the bolt itself; there is a gap between the connection seat with a hole and the two ends of the intermediate tube. Due to the existence of the gap, the bow head shaft can flexibly rotate around the bolt. The elastic buffer device is a spring box. The elastic buffer device is provided with a bow angle mounting plate, and the bow angle is mounted on the bow angle mounting plate.

[0041] In the above solutions, damping cannot be adaptively adjusted.

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] Reference Figures 1 to 4 The present invention discloses a lifting structure for a pantograph, comprising:

[0045] Base 1;

[0046] A pantograph seat 6 is escalably disposed on the base 1 and is used for mounting the pantograph 5;

[0047] A connecting rod structure, used for connecting the base 1 and the pantograph base 6;

[0048] The damping adjustable telescopic structure is arranged in the connecting rod structure and is used for buffering when the connecting rod structure is extended or folded. The damping adjustable telescopic structure is filled with magnetic fluid, and the magnetic fluid is magnetically connected to the elastic electromagnetic part, which is arranged between the base 1 and the pantograph seat 6;

[0049] The driving part is used to drive the connecting rod structure to extend or fold, and the driving part is arranged on the base 1.

[0050] Magnetorheological fluid is a special fluid composed of tiny magnetic particles suspended in a base liquid. In the absence of a magnetic field, the magnetorheological fluid exhibits a low resistance state and can flow freely; when a magnetic field is applied, the magnetic particles will quickly align and form a chain structure, thereby increasing viscosity and resistance.

[0051] When in use, the driving part drives the connecting rod structure to extend, so that the pantograph seat 6 rises. At this time, the pantograph 5 contacts the bottom of the conductor, and the elastic electromagnetic part provides contact force between the pantograph 5 and the conductor. In the process of the pantograph 5 moving along the conductor, the pantograph 5 changes with the height of the conductor, and the length of the damping adjustable telescopic structure changes. When the damping adjustable telescopic structure changes in telescopicity, the magnetic fluid provides resistance to the telescopic change, and a magnetic field is generated through the elastic electromagnetic part. The magnetic fluid changes its viscosity under the action of the magnetic field to achieve resistance change. Based on this, the damping of the telescopic structure is adjustable, and the damping size can be adaptively adjusted according to different road conditions.

[0052] As an optional embodiment, the connecting rod structure includes a first connecting rod portion and two second connecting rod portions, and the two second connecting rod portions are symmetrically arranged on the front and rear sides of the base 1;

[0053] The first connecting rod portion is arranged between the two second connecting rod portions;

[0054] The two second connecting rod parts are located on one side of the pantograph 5, and the first connecting rod part is located on the other side of the pantograph 5;

[0055] The driving part is transmission-connected with the first connecting rod part.

[0056] As an optional embodiment, the first connecting rod portion includes a third rod 9 and a fourth rod 10 which are hinged to each other, one end of the third rod 9 away from the fourth rod 10 is hinged to the bottom of the pantograph seat 6, and one end of the fourth rod 10 away from the third rod 9 is hinged to the top of the base 1;

[0057] A second damping adjustable telescopic rod 11 is provided between the third rod 9 and the fourth rod 10, one end of the second damping adjustable telescopic rod 11 is hinged to the middle of the third rod 9, and the other end of the second damping adjustable telescopic rod 11 is hinged to the middle of the fourth rod 10;

[0058] The fourth rod 10 is transmission-connected to the driving unit.

[0059] As an optional embodiment, the second connecting rod portion includes a first rod 2 and a second rod 3 which are hinged to each other, one end of the first rod 2 away from the second rod 3 is hinged to the top of the base 1, and one end of the second rod 3 away from the first rod 2 is hinged to the bottom of the pantograph seat 6;

[0060] A first damping adjustable telescopic rod 4 is provided between the first rod 2 and the second rod 3, one end of the first damping adjustable telescopic rod 4 is hinged to the middle of the first rod 2, and the other end of the first damping adjustable telescopic rod 4 is hinged to the middle of the second rod 3;

[0061] The first damping-adjustable telescopic rod 4 and the second damping-adjustable telescopic rod 11 have the same structure.

[0062] A group of mutually hinged third rods 9 and fourth rods 10 and two groups of mutually hinged first rods 2 and second rods 3 are used to support the pantograph seat 6. The first connecting rod portion and the second connecting rod portion are respectively located on both sides of the pantograph seat 6 to realize the vertical lifting of the pantograph seat 6 and also to improve the overall strength of the structure.

[0063] As an optional implementation, the first damping adjustable telescopic rod 4 includes:

[0064] A sleeve 401, a spacer ring 402 is axially connected to the inner side of the middle of the sleeve 401, and the spacer ring 402 divides the sleeve 401 into a sliding cavity 403 located at the top and a magnetic fluid temporary storage cavity 404 located at the bottom. The magnetic fluid is filled in the sliding cavity 403 and the magnetic fluid temporary storage cavity 404, and a sealing ring 406 is axially connected to the inner side of the top of the sliding cavity 403;

[0065] A sliding ring 407 is slidably disposed in the sliding cavity 403, and a plurality of through holes 408 for the passage of magnetic fluid are evenly spaced in the circumferential direction of the sliding ring 407;

[0066] One end of the sliding rod 405 is axially connected to the sliding ring 407 , and the other end of the sliding rod 405 passes through the sealing ring 406 .

[0067] When in use, the sliding cavity 403 located above and the magnetic fluid temporary storage cavity 404 located below are filled with magnetic fluid. When the elastic electromagnetic part generates a magnetic field, the viscosity of the magnetic fluid can change. When the sliding ring 407 slides, part of the magnetic fluid enters the upper part of the sliding cavity 403 through the through hole 408. In this process, the magnetic viscosity of the magnetic fluid is changed by the elastic electromagnetic part, and the damping size can be adjusted.

[0068] As an optional embodiment, the elastic electromagnetic part includes a second telescopic rod 14, and both ends of the second telescopic rod 14 are respectively fixed with magnetic coil slots 7, and the magnetic coil slots 7 are fixed to the corresponding bottom of the pantograph seat 6 or the top of the base 1;

[0069] The second telescopic rod 14 is provided with a spring-shaped magnetic coil 8 on its outer sleeve, and the magnetic coil 8 is used to provide elasticity and an electromagnetic field.

[0070] The magnetic coil 8 is in the form of a spring and can provide elastic supporting force for the pantograph seat 6 and the base 1 . The magnetic coil 8 is extended or compressed when the distance between the pantograph seat 6 and the base 1 changes.

[0071] The top end and the bottom end of the magnetic coil 8 are fixed to the corresponding magnetic coil slots 7 respectively.

[0072] Providing power to the magnetic coil 8 can generate an electromagnetic field, and the magnitude of the magnetic field can be adjusted according to the magnitude of the power, thereby adjusting the viscosity of the magnetic fluid.

[0073] As an optional embodiment, the driving part includes a telescopic rod 12, one end of the telescopic rod 12 is hinged to the middle of the fourth rod 10, and the other end of the telescopic rod 12 is hinged to the base 1;

[0074] The hinge axis between the telescopic rod 12 and the base 1 is connected to the output shaft of the rotary motor 13 , and the fixed end of the rotary motor 13 is fixedly connected to the base 1 .

[0075] When in use, the output shaft of the rotating motor 13 rotates to drive the telescopic rod 12 to rotate, and the telescopic rod 12 drives the fourth rod 10 to achieve the folding or unfolding between the third rod 9 and the fourth rod 10, thereby realizing the lifting and lowering of the pantograph 5.

[0076] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0077] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A pantograph lifting structure, characterized in that: include: Base (1); A pantograph seat (6) is movably arranged on the base (1), and the pantograph seat (6) is used for installing the pantograph (5); A connecting rod structure, used for connecting the base (1) and the pantograph base (6); A damping adjustable telescopic structure is arranged in the connecting rod structure and is used for buffering when the connecting rod structure is extended or folded. The damping adjustable telescopic structure is filled with magnetic fluid. The magnetic fluid is magnetically connected to an elastic electromagnetic part. The elastic electromagnetic part is arranged between the base (1) and the pantograph seat (6). A driving unit is used to drive the connecting rod structure to extend or fold, and the driving unit is arranged on the base (1).

2. A pantograph lifting structure according to claim 1, characterized in that: The connecting rod structure comprises a first connecting rod portion and two second connecting rod portions, wherein the two second connecting rod portions are symmetrically arranged on the front and rear sides of the base (1); The first connecting rod portion is arranged between two of the second connecting rod portions; The two second connecting rod parts are located on one side of the pantograph (5), and the first connecting rod part is located on the other side of the pantograph (5); The driving portion is transmission-connected to the first connecting rod portion.

3. A pantograph lifting structure according to claim 2, characterized in that: The first connecting rod portion comprises a third rod (9) and a fourth rod (10) which are hinged to each other, one end of the third rod (9) away from the fourth rod (10) is hinged to the bottom of the pantograph seat (6), and one end of the fourth rod (10) away from the third rod (9) is hinged to the top of the base (1); A second damping-adjustable telescopic rod (11) is provided between the third rod (9) and the fourth rod (10), one end of the second damping-adjustable telescopic rod (11) is hinged to the middle of the third rod (9), and the other end of the second damping-adjustable telescopic rod (11) is hinged to the middle of the fourth rod (10); The fourth rod (10) is in transmission connection with the driving part.

4. A pantograph lifting structure according to claim 3, characterized in that: The second connecting rod portion comprises a first rod (2) and a second rod (3) which are hinged to each other, wherein one end of the first rod (2) away from the second rod (3) is hinged to the top of the base (1), and one end of the second rod (3) away from the first rod (2) is hinged to the bottom of the pantograph seat (6); A first damping-adjustable telescopic rod (4) is provided between the first rod (2) and the second rod (3); one end of the first damping-adjustable telescopic rod (4) is hinged to the middle of the first rod (2), and the other end of the first damping-adjustable telescopic rod (4) is hinged to the middle of the second rod (3); The first damping-adjustable telescopic rod (4) and the second damping-adjustable telescopic rod (11) have completely the same structure.

5. The pantograph lifting structure according to claim 4, characterized in that: The first damping adjustable telescopic rod (4) comprises: A sleeve (401), wherein a spacer ring (402) is axially connected to the inner side of the middle of the sleeve (401), and the spacer ring (402) divides the sleeve (401) into a sliding cavity (403) located at the top and a magnetic fluid temporary storage cavity (404) located at the bottom, and the magnetic fluid is filled in the sliding cavity (403) and the magnetic fluid temporary storage cavity (404), and a sealing ring (406) is axially connected to the inner side of the top of the sliding cavity (403); A sliding ring (407) is slidably disposed in the sliding cavity (403), and the sliding ring (407) is provided with a plurality of through holes (408) for the passage of magnetic fluid at equal intervals in the circumferential direction; One end of the sliding rod (405) is axially connected to the sliding ring (407), and the other end of the sliding rod (405) passes through the sealing ring (406).

6. The pantograph lifting structure according to claim 1, characterized in that: The elastic electromagnetic part comprises a second telescopic rod (14), both ends of the second telescopic rod (14) are respectively fixedly connected with magnetic coil grooves (7), and the magnetic coil grooves (7) are fixedly connected to the corresponding bottom of the pantograph seat (6) or the top of the base (1); The outer shell of the second telescopic rod (14) is provided with a magnetic coil (8) in the form of a spring, and the magnetic coil (8) is used to provide elasticity and an electromagnetic field.

7. The pantograph lifting structure according to claim 3, characterized in that: The driving part comprises a telescopic rod (12), one end of the telescopic rod (12) is hinged to the middle part of the fourth rod (10), and the other end of the telescopic rod (12) is hinged to the base (1); The hinge axis between the telescopic rod (12) and the base (1) is connected to the output shaft of a rotary motor (13), and the fixed end of the rotary motor (13) is fixedly connected to the base (1).

Images