A rolling current collecting test device and test method for electrified rail trains

Abstract

The present invention discloses a rolling and sliding current collecting test device and test method for electrified rail trains, including a test platform, a servo screw assembly, a normal loading assembly, a current collecting roller test assembly and a friction rotating disk assembly. A servo screw assembly is provided above the test platform, the servo screw assembly is connected to the normal loading assembly through a screw nut seat, the normal loading assembly and the current collecting roller test assembly are connected and fixed, and the current collecting roller and the friction rotating disk assembly in the current collecting roller test assembly are in friction contact. The present invention adopts the above-mentioned rolling and sliding current collecting test device and test method for electrified rail trains, which can simulate the current-carrying operating conditions during the actual operation of rail trains, and monitor the real-time voltage and current at both ends of the copper alloy contact wire and the current collecting roller, transmit the real-time voltage and current data to the data acquisition system and process them, and realize the measurement of the real-time rolling and sliding contact resistance of the copper alloy contact wire and the current collecting roller.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicle testing, and in particular to a rolling and sliding current collection testing device and a testing method for electrified rail vehicles. Background Art

[0002] In the electrified railway network, the pantograph and catenary friction pair composed of the pantograph and the contact network is a key component to ensure railway operation. The friction and wear problems of the pantograph-catenary friction pair are prominent in long-term alternation, variable load, strong current, high voltage, high-speed sliding, mobile arcing and complex environments. Its electrical contact characteristics and current-carrying tribological behavior directly affect the reliability, safety, maintainability and economy of train operation.

[0003] Traditional sliding contact current collection is achieved through sliding friction between the pantograph and the contact wire or the collector shoe and the conductive rail. It is the only transmission path for energy of various types of vehicles, such as passenger and freight vehicles, EMUs and subways. However, the wear of the traditional pantograph slide is still one of the key factors restricting its life, safety and reliability. The innovative design of the bow head structure is expected to greatly improve the reliability and life of the pantograph network system, that is, using a rolling bow head instead of a sliding bow head, and replacing the two-dimensional sliding contact motion with a rolling contact motion, so that the contact pair has a lower friction coefficient and a smaller wear rate. However, the influence of various operating parameters on the current collection mechanism and tribological behavior of the rolling bow head under the rolling motion mode is currently unclear. In view of this, the present invention proposes a rolling current collection test device and test method for electrified rail vehicles, which can study the influence of different operating parameters on the current collection mechanism and tribological behavior of the rolling bow head under the rolling motion mode. Summary of the invention

[0004] The purpose of the present invention is to provide a rolling and sliding current collecting test device and test method for electrified rail trains, which can simulate the current-carrying operating conditions during the actual operation of rail trains, monitor the real-time voltage and current at both ends of the copper alloy contact wire and the current collecting roller, transmit the real-time voltage and current data to a data acquisition system and process them, and realize the measurement of the real-time rolling and sliding contact resistance of the copper alloy contact wire and the current collecting roller; and monitor the normal load and friction force between the copper alloy contact wire and the current collecting roller, transmit the real-time normal force and friction force data to the data acquisition system and process them, and realize the measurement of the real-time rolling and sliding friction coefficient of the copper alloy contact wire and the current collecting roller.

[0005] The present invention provides a rolling and sliding current collecting test device and test method for electrified rail trains, comprising a test platform, a servo screw assembly, a normal loading assembly, a current collecting roller test assembly and a friction rotating disk assembly. A servo screw assembly is arranged above the test platform, the servo screw assembly is connected to the normal loading assembly via a screw nut seat, the normal loading assembly and the current collecting roller test assembly are connected and fixed, and the current collecting roller and the friction rotating disk assembly in the current collecting roller test assembly are in friction contact.

[0006] Preferably, the servo screw assembly includes a first guide rail pad, a first guide rail slider, a screw support seat, a screw support seat fixing plate, a transmission screw, a second guide rail pad, a second guide rail slider, a screw nut seat, a screw fixing seat, a coupling, a screw fixing seat fixing plate, and a servo motor; the servo screw assembly includes a first guide rail pad and a second guide rail pad arranged above the test platform and fixedly connected thereto, the first guide rail pad and the first guide slider are fixedly connected, the second guide rail pad and the second guide slider are fixedly connected, the test platform and the servo screw assembly are fixedly connected by fixing the screw support seat, the screw fixing seat, the screw support seat fixing plate and the screw fixing seat fixing plate, a transmission screw and a screw nut seat are arranged between the screw support seat and the screw fixing seat, one end of the transmission screw is transmission-connected to the output end of the servo motor through a coupling, and the servo motor drives the transmission screw to rotate, thereby driving the screw nut seat to move.

[0007] Preferably, the first guide rail slider and the second guide rail slider are parallel to each other, and a motor screw assembly for transmission is arranged between the first guide rail slider and the second guide rail slider.

[0008] Preferably, the normal loading assembly includes a normal assembly support plate, a third guide rail slider, a test assembly fixing frame, a fourth guide rail slider, a normal force sensor, a shock absorbing spring, a cylinder-spring connector, a cylinder mounting seat and a loading cylinder; the normal loading assembly includes a normal assembly support plate fixedly connected to the screw nut seat, the third guide rail slider and the fourth guide rail slider are fixedly installed above the normal assembly support plate, the third guide rail slider and the fourth guide rail slider are provided with a test assembly fixing frame, the test assembly fixing frame is connected to the normal force sensor, the normal force sensor is fixedly connected with the shock absorbing spring, the cylinder-spring connector and the loading cylinder in sequence from near to far, the loading cylinder is fixed to the end face of the cylinder mounting seat, and the cylinder mounting seat is fixedly connected to the normal assembly support plate.

[0009] Preferably, the current collecting roller test assembly includes a first connecting piece of the friction sensor, a friction sensor, a second connecting piece of the friction sensor, a first end cover assembly, a first locking nut, a first ceramic ball bearing, a second locking nut, a current collecting roller, a current collecting roller rotating support shaft, a second ceramic ball bearing, a third locking nut, a first mercury slip ring support frame, a first mercury slip ring, a second end cover assembly, a current collecting roller support frame and a fifth guide rail slider; the current collecting roller test assembly includes a current collecting roller, which is positioned and installed in the middle of the current collecting roller rotating support shaft through a shoulder and is locked by a second locking nut, a first mercury slip ring is provided at the end of the current collecting roller rotating support shaft, the first mercury slip ring is fixedly connected to the end of the current collecting roller rotating support shaft through the first mercury slip ring support frame, and the first ceramic ball bearing and the second ceramic ball bearing are provided at both ends of the current collecting roller rotating support shaft. Ball bearings, the first ceramic ball bearing and the second ceramic ball bearing are positioned with their inner rings through the shoulder of the current collecting roller rotating support shaft, the outer rings of the bearings are positioned through the first end cover assembly and the second end cover assembly, the first end cover assembly and the second end cover assembly are locked to fix the outer rings of the first ceramic ball bearing and the second ceramic ball bearing respectively, the first locking nut and the third locking nut are used for pre-tightening, and the axial clearance of the first ceramic ball bearing and the second ceramic ball bearing is adjusted, the first end cover assembly and the second end cover assembly are fixed to the current collecting roller support frame, the current collecting roller support frame is fixedly connected to the fifth guide rail slider, the fifth guide rail slider is fixedly connected to the test assembly fixing frame, a friction sensor is arranged at one end of the current collecting roller support frame, and the friction sensor is fixedly connected to the test assembly fixing frame and the current collecting roller support frame through the first friction sensor connector and the second friction sensor connector respectively.

[0010] Preferably, the current collecting roller support frame, the fifth guide rail slider and the test assembly fixing frame are horizontal and not tilted.

[0011] Preferably, the friction rotating disk assembly includes a copper alloy contact wire, a contact wire mounting disk, an insulating disk, a rotating chassis and a second mercury slip ring; the copper alloy contact wire is fixedly connected to the contact wire mounting disk, the contact wire mounting disk is fixedly connected to the insulating disk, the insulating disk is fixedly connected to the rotating chassis, and a second mercury slip ring is arranged at the rotation center of the contact wire mounting disk.

[0012] Preferably, the current collecting roller is installed on the rotating support shaft and locked with a locking nut, and then the current collecting roller and the rotating support shaft are installed on the current collecting roller support frame and fixed with a first end cover assembly and a second end cover assembly, and the bearing clearance is adjusted with a locking nut; the copper alloy contact wire is installed on the contact wire mounting disk; the air source is started, and the loading cylinder drives the test assembly fixing frame to perform normal movement, thereby driving the current collecting roller test assembly to move normally and finally contact the friction rotating disk assembly; the positive and negative terminals of the DC power supply are respectively connected to the first mercury slip ring and the second mercury slip ring, and the DC power supply is turned on and adjusted to the test current; the friction rotating disk assembly is subjected to rotational motion to the test speed, and the servo motor drives the transmission screw to rotate, thereby driving the screw nut seat to move, and then driving the normal loading assembly fixedly connected to the screw nut seat to reciprocate.

[0013] Therefore, the present invention adopts the above-mentioned rolling and sliding current collecting test device and test method for electrified rail trains, which can simulate the current-carrying operating conditions during the actual operation of the rail train, monitor the real-time voltage and current at both ends of the copper alloy contact wire and the current collecting roller, transmit the real-time voltage and current data to the data acquisition system and process them, and realize the measurement of the real-time rolling and sliding contact resistance of the copper alloy contact wire and the current collecting roller; and monitor the normal load and friction force between the copper alloy contact wire and the current collecting roller, transmit the real-time normal force and friction force data to the data acquisition system and process them, and realize the measurement of the real-time rolling and sliding friction coefficient of the copper alloy contact wire and the current collecting roller.

[0014] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an overall schematic diagram of a rolling and sliding current collecting test device and test method for electrified rail trains according to the present invention;

[0016] Figure 2 It is a schematic structural diagram of a servo screw assembly of a rolling and sliding current collection test device and test method for an electrified rail train according to the present invention;

[0017] Figure 3 It is a schematic structural diagram of a normal loading component and a current collecting roller test component of a rolling and sliding current collecting test device and test method for an electrified rail train according to the present invention;

[0018] Figure 4 The present invention is a schematic structural diagram of a friction rotating disk assembly of a rolling and sliding current collection test device and test method for electrified rail vehicles.

[0019] Reference numerals

[0020] 1. Test platform; 2. Servo screw assembly; 3. Normal loading assembly; 4. Current receiving roller test assembly; 5. Friction rotating disk assembly; 201. First guide rail pad; 202. First guide rail slider; 203. Screw support seat; 204. Screw support seat fixing plate; 205. Transmission screw; 206. Second guide rail pad; 207. Second guide rail slider; 208. Screw nut seat; 209. Screw fixing seat; 210. Coupling; 211. Screw fixing seat fixing plate; 212. Servo motor; 301. Normal assembly support plate; 302. Third guide rail slider; 303. Test assembly fixing frame; 304. Fourth guide rail slider; 305. Normal force sensor; 306. Shock-absorbing spring; 307. Cylinder-spring connector; 308. Air Cylinder mounting seat; 309, loading cylinder; 401, first connecting piece of friction force sensor; 402, friction force sensor; 403, second connecting piece of friction force sensor; 404, first end cover assembly; 405, first locking nut; 406, first ceramic ball bearing; 407, second locking nut; 408, current collecting roller; 409, current collecting roller rotating support shaft; 410, second ceramic ball bearing; 411, third locking nut; 412, first mercury slip ring support frame; 413, first mercury slip ring; 414, second end cover assembly; 415, current collecting roller support frame; 416, fifth guide rail slider; 501, copper alloy contact wire; 502, contact wire mounting disk; 503, insulating disk; 504, rotating chassis; 505, second mercury slip ring. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0022] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by one having ordinary skills in the field to which the present invention belongs.

[0023] Embodiment 1

[0024] like Figure 1-Figure 4 As shown, the present invention provides a rolling and sliding current collecting test device and test method for electrified rail trains, comprising a test platform 1, a servo screw assembly 2, a normal loading assembly 3, a current collecting roller test assembly 4 and a friction rotating disk assembly 5. A servo screw assembly 2 is provided above the test platform 1. The servo screw assembly 2 is connected to the normal loading assembly 3 through a screw nut seat. The normal loading assembly 3 and the current collecting roller test assembly 4 are connected and fixed. The current collecting roller in the current collecting roller test assembly 4 and the friction rotating disk assembly 5 are in friction contact.

[0025] The servo screw assembly 2 includes a first guide rail pad 201, a first guide rail slider 202, a screw support seat 203, a screw support seat fixing plate 204, a transmission screw 205, a second guide rail pad 206, a second guide rail slider 207, a screw nut seat 208, a screw fixing seat 209, a coupling 210, a screw fixing seat fixing plate 211, and a servo motor 212; the servo screw assembly 2 includes a first guide rail pad 201 and a second guide rail pad 206 arranged above the test platform 1 and fixedly connected thereto, and a second guide rail pad 206 and a second guide rail pad 206 are provided. A guide rail pad 201 is fixedly connected to the first guide rail slider 202, the second guide rail pad 206 is fixedly connected to the second guide rail slider 207, the test platform 1 and the servo screw assembly 2 are fixedly connected through the fixed screw support seat 203, the screw fixing seat 209, the screw support seat fixing plate 204 and the screw fixing seat fixing plate 211, and a transmission screw 205 and a screw nut seat 208 are arranged between the screw support seat 203 and the screw fixing seat 209. The use of the transmission screw 205 can ensure the smooth operation of the mechanism.

[0026] One end of the transmission screw 205 is connected to the output end of the servo motor 212 through the coupling 210, and the servo motor 212 drives the transmission screw 205 to rotate, thereby driving the screw nut seat 208 to move. Then the normal loading component 3 fixedly connected to the screw nut seat 208 is driven to reciprocate. By adjusting the forward and reverse speeds of the servo motor, the stepless speed change of the entire reciprocating motion mechanism can be achieved, thereby simulating the operating conditions of the pantograph head and the contact line of the rail train at different reciprocating speeds. In addition, the use of servo motor drive can also achieve a rapid response of the reciprocating motion commutation, making it closer to the actual operating conditions of the pantograph head and the contact line of the rail train.

[0027] The first guide rail slider 202 and the second guide rail slider 207 are parallel to each other, and a motor screw assembly for transmission is arranged between the first guide rail slider 202 and the second guide rail slider 207 .

[0028] The normal loading component 3 includes a normal component support plate 301, a third guide rail slider 302, a test component fixing frame 303, a fourth guide rail slider 304, a normal force sensor 305, a shock absorbing spring 306, a cylinder-spring connector 307, a cylinder mounting seat 308, and a loading cylinder 309; the normal loading component 3 includes a normal component support plate 301 fixedly connected to the screw nut seat 208, and the third guide rail slider 302 and the fourth guide rail slider 304 are fixedly installed above the normal component support plate 301. During installation, the parallelism requirements of the two guide rail sliders should be ensured.

[0029] The third guide rail slider 302 and the fourth guide rail slider 304 are provided with a test assembly fixing frame 303, and the test assembly fixing frame 303 is connected to the normal force sensor 305. The normal force sensor 305 is fixedly connected with a damping spring 306, a cylinder-spring connector 307, and a loading cylinder 309 in sequence from near to far. During installation, the four should be kept coaxial as much as possible. The damping spring 306 can effectively reduce the fluctuation of the normal loading force caused by the uneven contact of the test piece during the test. The loading cylinder 309 is fixed to the end face of the cylinder mounting seat 308, and the cylinder mounting seat 308 is fixedly connected to the normal assembly support plate 301.

[0030] The normal loading component 3 is loaded by the loading cylinder 309. When the normal force is loaded, the air source is started, and the loading cylinder 309 drives the test component fixing frame 303 to move normally, thereby driving the current collecting roller test component 4 to move normally and finally contact the friction rotating disk component 5 to apply the normal load. In addition, the loading force can be adjusted steplessly by adjusting the pressure of the loading cylinder input air source.

[0031] The current collecting roller test assembly 4 includes a first connecting piece 401 of a friction sensor, a friction sensor 402, a second connecting piece 403 of a friction sensor, a first end cover assembly 404, a first locking nut 405, a first ceramic ball bearing 406, a second locking nut 407, a current collecting roller 408, a current collecting roller rotating support shaft 409, a second ceramic ball bearing 410, a third locking nut 411, a first mercury slip ring support frame 412, a first mercury slip ring 413, a second end cover assembly 414, a current collecting roller support frame 415 and a fifth guide rail slider 416.

[0032] The current collecting roller test assembly 4 includes a current collecting roller 408, which is positioned and installed in the middle of the current collecting roller rotating support shaft 409 through a shaft shoulder and locked by a second locking nut 407. A first mercury slip ring 413 is provided at the shaft end of the current collecting roller rotating support shaft 409 for current loading during the test. The first mercury slip ring 413 is fixedly connected to the shaft end of the current collecting roller rotating support shaft 409 through a first mercury slip ring support frame 412. When the current collecting roller rotating support shaft 409 rotates, one end of the first mercury slip ring 413 is driven to rotate, while the other end of the first mercury slip ring remains fixed and connected to the current loading wire, thereby applying current to the current collecting roller 408 during the rotation process.

[0033] The first ceramic ball bearing 406 and the second ceramic ball bearing 410 are provided at both ends of the current collecting drum rotating support shaft 409 to provide rotational support and insulation for the bearings. The ceramic ball bearings electrically isolate the inner and outer rings of the bearings through the ceramic ball rolling elements, thereby ensuring that the charged body is only the rotating parts. The first ceramic ball bearing 406 and the second ceramic ball bearing 410 are positioned at the inner rings of the bearings through the shoulder of the current collecting drum rotating support shaft 409, and the outer rings of the bearings are positioned through the first end cover assembly 404 and the second end cover assembly 414. The first end cover assembly 404 and the second end cover assembly 414 can be locked to fix the outer rings of the first ceramic ball bearing 406 and the second ceramic ball bearing 410 respectively, and the first locking nut 405 and the third locking nut 411 are used for pre-tightening to adjust the axial clearance of the first ceramic ball bearing 406 and the second ceramic ball bearing 410. The first end cover assembly 40 4. The second end cover assembly 414 is fixed to the current receiving roller support frame 415, the current receiving roller support frame 415 is fixedly connected to the fifth guide rail slider 416, the fifth guide rail slider 416 is fixedly connected to the test assembly fixing frame 303, and a friction sensor 402 is provided at one end of the current receiving roller support frame 415 to monitor the real-time friction force during the movement. The friction sensor 402 is fixedly connected to the test assembly fixing frame 303 and the current receiving roller support frame 415 through the first friction sensor connector 401 and the second friction sensor connector 403. When installing and fixing, it should be ensured that the friction sensor 402 is only subjected to the force along the axial direction of the rotating shaft.

[0034] The current collecting roller support frame 415, the fifth guide rail slider 416 and the test assembly fixing frame 303 are horizontal and not tilted.

[0035] The friction rotating disk assembly 5 includes a copper alloy contact wire 501, a contact wire mounting disk 502, an insulating disk 503, a rotating chassis 504 and a second mercury slip ring 505; the copper alloy contact wire 501 is fixedly connected to the contact wire mounting disk 502, the contact wire mounting disk 502 is fixedly connected to the insulating disk 503, the insulating disk 503 is fixedly connected to the rotating chassis 504, and a second mercury slip ring 505 is provided at the rotation center of the contact wire mounting disk 502 for current loading during the test. During installation, the five should be installed coaxially as much as possible. During current loading, the current loading wire is connected to one end of the second mercury slip ring 505, and the other end of the second mercury slip ring 505 is fixedly installed at the rotation center of the contact wire mounting disk 502, so that the current can be loaded on the copper alloy contact wire 501 that is rotating.

[0036] The receiving roller 408 is mounted on the rotating support shaft 409 and locked with the locking nut 407. Then, the receiving roller 408 and the rotating support shaft 409 are mounted on the receiving roller support frame 415 and fixed with the first end cover assembly 404 and the second end cover assembly 414. The bearing clearance is adjusted with the locking nuts 405 and 411 to make the receiving roller rotate smoothly.

[0037] Installing the copper alloy contact wire 501 on the contact wire installation plate 502;

[0038] Start the gas source, the loading cylinder 309 drives the test assembly fixing frame 303 to move in the normal direction, thereby driving the current collecting roller test assembly 4 to move in the normal direction and finally contact the friction rotating disk assembly 5 to apply the normal load;

[0039] Connect the positive and negative terminals of the DC power supply to the first mercury slip ring 413 and the second mercury slip ring 505 respectively, turn on the DC power supply, and adjust it to the test current;

[0040] Applying a rotational motion to the friction rotating disk assembly 5 to a test speed, so that the current collecting drum 408 rolls under the driving force of friction;

[0041] The servo motor 212 drives the transmission screw 205 to rotate, thereby driving the screw nut seat 208 to move. Then, the normal loading assembly 3 fixedly connected to the screw nut seat 208 is driven to reciprocate, realizing a rolling and sliding composite motion;

[0042] The real-time friction force is monitored by the friction force sensor 402 and the rolling friction coefficient is calculated. The contact resistance is calculated by measuring the real-time voltage and current at both ends of the current receiving roller 408 and the copper alloy contact wire 501.

[0043] Therefore, the present invention adopts the above-mentioned rolling and sliding current collecting test device and test method for electrified rail trains, which can simulate the current-carrying operating conditions during the actual operation of the rail train, monitor the real-time voltage and current at both ends of the copper alloy contact wire and the current collecting roller, transmit the real-time voltage and current data to the data acquisition system and process them, and realize the measurement of the real-time rolling and sliding contact resistance of the copper alloy contact wire and the current collecting roller; and monitor the normal load and friction force between the copper alloy contact wire and the current collecting roller, transmit the real-time normal force and friction force data to the data acquisition system and process them, and realize the measurement of the real-time rolling and sliding friction coefficient of the copper alloy contact wire and the current collecting roller.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A rolling and sliding current collection test device for electrified rail vehicles, characterized in that: It includes a test platform, a servo screw assembly, a normal loading assembly, a current collecting roller test assembly and a friction rotating disk assembly. A servo screw assembly is arranged above the test platform. The servo screw assembly is connected to the normal loading assembly through a screw nut seat. The normal loading assembly and the current collecting roller test assembly are connected and fixed. In the current collecting roller test assembly, the current collecting roller and the friction rotating disk assembly are in friction contact. The normal loading component includes a normal component support plate, a third guide rail slider, a test component fixing frame, a fourth guide rail slider, a normal force sensor, a shock absorbing spring, a cylinder-spring connector, a cylinder mounting seat and a loading cylinder; the normal loading component includes a normal component support plate fixedly connected to a screw nut seat, a third guide rail slider and a fourth guide rail slider are fixedly mounted above the normal component support plate, a test component fixing frame is arranged on the third guide rail slider and the fourth guide rail slider, the test component fixing frame is connected to the normal force sensor, the normal force sensor is fixedly connected with a shock absorbing spring, a cylinder-spring connector and a loading cylinder in sequence from near to far, the loading cylinder is fixed to the end face of the cylinder mounting seat, and the cylinder mounting seat is fixedly connected to the normal component support plate; The current collecting roller test assembly includes a first connecting piece of a friction sensor, a friction sensor, a second connecting piece of a friction sensor, a first end cover assembly, a first locking nut, a first ceramic ball bearing, a second locking nut, a current collecting roller, a current collecting roller rotating support shaft, a second ceramic ball bearing, a third locking nut, a first mercury slip ring support frame, a first mercury slip ring, a second end cover assembly, a current collecting roller support frame and a fifth guide rail slider; the current collecting roller test assembly includes a current collecting roller, which is positioned and installed on the middle part of the current collecting roller rotating support shaft through a shoulder and is locked by a second locking nut, a first mercury slip ring is provided at the shaft end of the current collecting roller rotating support shaft, the first mercury slip ring is fixedly connected to the shaft end of the current collecting roller rotating support shaft through the first mercury slip ring support frame, and a first ceramic ball bearing and a second ceramic ball shaft are provided at both ends of the current collecting roller rotating support shaft. The first ceramic ball bearing and the second ceramic ball bearing are positioned with the inner ring of the bearing through the shoulder of the current collecting roller rotating support shaft, and the outer ring of the bearing is positioned through the first end cover assembly and the second end cover assembly. The first ceramic ball bearing and the second ceramic ball bearing outer ring can be fixed by locking the first end cover assembly and the second end cover assembly respectively. The first locking nut and the third locking nut are used for pre-tightening to adjust the axial clearance of the first ceramic ball bearing and the second ceramic ball bearing. The first end cover assembly and the second end cover assembly are fixed to the current collecting roller support frame, and the current collecting roller support frame is fixedly connected to the fifth guide rail slider, and the fifth guide rail slider is fixedly connected to the test assembly fixing frame. A friction sensor is arranged at one end of the current collecting roller support frame, and the friction sensor is fixedly connected to the test assembly fixing frame and the current collecting roller support frame through the first friction sensor connector and the second friction sensor connector respectively. The current collecting roller support frame, the fifth guide rail slider and the test component fixing frame are horizontal and not tilted.

2. The rolling and sliding current collecting test device for electric rail vehicles according to claim 1, characterized in that: The servo screw assembly includes a first guide rail pad, a first guide rail slider, a screw support seat, a screw support seat fixing plate, a transmission screw, a second guide rail pad, a second guide rail slider, a screw nut seat, a screw fixing seat, a coupling, a screw fixing seat fixing plate, and a servo motor; the servo screw assembly includes a first guide rail pad and a second guide rail pad that are arranged above the test platform and fixedly connected thereto, the first guide rail pad and the first guide slider are fixedly connected, the second guide rail pad and the second guide slider are fixedly connected, the test platform and the servo screw assembly are fixedly connected by fixing the screw support seat, the screw fixing seat, the screw support seat fixing plate and the screw fixing seat fixing plate, a transmission screw and a screw nut seat are arranged between the screw support seat and the screw fixing seat, one end of the transmission screw is transmission-connected to the output end of the servo motor through a coupling, and the servo motor drives the transmission screw to rotate, thereby driving the screw nut seat to move.

3. The rolling and sliding current collecting test device for electric rail vehicles according to claim 2, characterized in that: The first guide rail slider and the second guide rail slider are parallel to each other, and a motor screw assembly for transmission is arranged between the first guide rail slider and the second guide rail slider.

4. The rolling and sliding current collecting test device for electric rail vehicles according to claim 1, characterized in that: The friction rotating disk assembly includes a copper alloy contact wire, a contact wire mounting disk, an insulating disk, a rotating chassis and a second mercury slip ring; the copper alloy contact wire is fixedly connected to the contact wire mounting disk, the contact wire mounting disk is fixedly connected to the insulating disk, the insulating disk is fixedly connected to the rotating chassis, and a second mercury slip ring is arranged at the rotation center of the contact wire mounting disk.

5. A test method for a rolling and sliding current collecting test device for an electrified railway train according to any one of claims 1 to 4, characterized in that: Install the current collecting roller on the rotating support shaft and lock it with a locking nut, then install the current collecting roller and the rotating support shaft on the current collecting roller support frame, and fix them with the first end cover assembly and the second end cover assembly, and adjust the bearing clearance with a locking nut; install the copper alloy contact wire on the contact wire mounting disk; start the air source, and the loading cylinder drives the test assembly fixing frame to move normally, thereby driving the current collecting roller test assembly to move normally and finally contact with the friction rotating disk assembly; connect the positive and negative terminals of the DC power supply to the first mercury slip ring and the second mercury slip ring respectively, turn on the DC power supply, and adjust it to the test current; apply rotational motion to the friction rotating disk assembly to the test speed, and the servo motor drives the transmission screw to rotate, thereby driving the screw nut seat to move, and then drives the normal loading assembly fixedly connected to the screw nut seat to reciprocate.

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