Urban rail single-section vehicle ground return flow test device

Abstract

The utility model discloses a city rail single section vehicle ground return test device relates to vehicle ground return test technical field, including base, the base upside is installed with sliding seat, the base upper recess symmetry is installed with guide column, install screw rod between the guide column, install screw rod nut on the screw rod, the one end of screw rod is installed with servo motor, the sliding seat upside is installed with motor. The utility model discloses the sliding seat, base, servo motor, screw rod, guide column and screw rod nut that are set up, make servo motor drive screw rod rotate, and then make sliding seat along guide column transverse movement, make the wheel shaft of sliding seat upside installation along the axial transverse movement, and then make carbon brush structure receive axial force effect, make carbon brush structure's axial bearing force get the test.

Description

Technical Field

[0001] This utility model relates to the field of vehicle grounding return current test technology, specifically a grounding return current test device for a single urban rail vehicle. Background Technology

[0002] Urban rail vehicles typically obtain current through elevated lines or third rails, transmitting it to the rails via axles and wheels to form a current loop. To ensure stable current transmission, urban rail vehicles are equipped with a grounding return device, which is electrically connected to the vehicle's axles, allowing current to be transmitted to the rails through the axles and wheels. The core component of the grounding return device is a carbon brush structure, which works in conjunction with a contact plate at the end of the axle to achieve dynamic conductivity. During vehicle operation, the axle may experience axial movement due to vibration, installation errors, or other factors, causing the carbon brush structure to be subjected to axial forces. If the axial bearing capacity of the carbon brush structure is insufficient, poor contact, excessive wear, or even breakage may occur, affecting the stability of the return current and posing a safety hazard.

[0003] Existing reflow testing devices mostly focus on testing the radial contact performance and current transmission efficiency between the carbon brush and the contact plate, but they cannot simulate the axial movement of the axle, resulting in the inability to effectively test the axial load-bearing capacity of the carbon brush structure. Although some testing devices attempt to incorporate movable parts, the descriptions of the connection method between the contact plate and the axle, the installation form of the carbon brush structure, the current conduction path, and the testing methods are vague, making it difficult for those skilled in the art to clearly understand how to achieve axial force testing and reflow performance testing, and the technical solutions lack feasibility.

[0004] Therefore, there is an urgent need for a grounding return current test device for a single-car urban rail vehicle with a clear structure and controllable operation, in order to solve the problems of the inability to test the axial bearing capacity of the carbon brush structure and the lack of clear technical solutions in the existing technology. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the existing defects and provide a grounding return current test device for a single-section urban rail vehicle. Through the setting of a sliding seat, a base, a servo motor, a lead screw, a guide column, and a lead screw nut, the servo motor drives the lead screw to rotate, which in turn causes the sliding seat to move laterally along the guide column. This causes the wheel axle mounted on the upper side of the sliding seat to move laterally along the axis, thereby subjecting the carbon brush structure to axial force and testing the axial bearing capacity of the carbon brush structure. This can effectively solve the problems in the background technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a grounding return current test device for a single-section urban rail vehicle, comprising a base, a sliding seat mounted on the upper side of the base, guide columns symmetrically mounted in a pre-set groove on the upper part of the base, a lead screw mounted between the symmetrically mounted guide columns, a lead screw nut mounted on the lead screw, a servo motor mounted at one end of the lead screw, the sliding seat fixedly connected to the lead screw nut and connected to the guide columns through a sliding bearing, a motor mounted on the upper side of the sliding seat, a gearbox mounted on the output end of the motor, a wheel axle mounted on the output end of the gearbox, a contact plate coaxially and detachably connected to the end of the wheel axle away from the gearbox; a pressure sensor embedded on the surface of the contact plate; an integrally formed wheel on the outer ring side of the wheel axle, and a return current guide wheel fixed to the base is provided below the wheel, wherein: the contact plate is used to connect the carbon brush structure of the grounding return current device under test, and the pressure sensor is used to connect to an external data acquisition system to monitor the axial pressure on the carbon brush structure in real time.

[0007] Furthermore, a support frame is provided at the end of the axle away from the transmission, and the lower end of the support frame is fixed to the base.

[0008] Furthermore, the support frame is provided with bolt holes for fixing the housing of the grounding return device under test.

[0009] Furthermore, the sliding seat is bolted to the motor housing, and the sliding seat is connected to the guide post via a sliding bearing.

[0010] Furthermore, the lead screw nut is bolted to the sliding seat, and the return guide wheel is bolted to the base.

[0011] Furthermore, the lower end of the support frame is connected to the base by bolts, and an insulating layer is installed between the lower end of the support frame and the base.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model, through the setting of a sliding seat, base, servo motor, lead screw, guide column and lead screw nut, enables the servo motor to drive the lead screw to rotate, thereby causing the sliding seat to move laterally along the guide column, causing the wheel axle installed on the upper side of the sliding seat to move laterally along the axis, thereby causing the carbon brush structure to be subjected to axial force, and thus the axial bearing capacity of the carbon brush structure can be tested.

[0014] 2. A lead screw mechanism driven by a servo motor precisely controls the axial displacement of the wheel axle, simulating the wheel axle movement during vehicle operation;

[0015] 3. The contact plate integrates a pressure sensor to quantify the axial force data of the carbon brush structure in real time; and

[0016] 4. The insulating support frame isolates the test current, ensuring the accuracy of the test results. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the left sectional view of the base in this utility model;

[0019] Figure 3 This is a partial structural diagram of the base in this utility model.

[0020] In the diagram: 1. Motor; 2. Sliding seat; 3. Gearbox; 4. Axle; 5. Wheel; 6. Support frame; 7. Bolt hole; 8. Base; 9. Guide column; 10. Lead screw; 11. Lead screw nut; 12. Servo motor; 13. Return guide wheel; 14. Contact plate; 15. Pressure sensor. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-3 This embodiment provides a technical solution: a grounding return current test device for a single-car urban rail vehicle, including a base 8. A sliding seat 2 is installed on the upper side of the base 8. Guide columns 9 are symmetrically installed in a pre-set groove on the upper part of the base 8. A lead screw 10 is installed between the symmetrically installed guide columns 9. A lead screw nut 11 is installed on the lead screw 10. A servo motor 12 is installed at one end of the lead screw 10. The sliding seat 2 is fixedly connected to the lead screw nut 11 and connected to the guide columns 9 through a sliding bearing. A motor 1 is installed on the upper side of the sliding seat 2. The output end of the motor 1... A gearbox 3 is installed, and an axle 4 is installed at the output end of the gearbox 3. A contact plate 14 is detachably connected to the end of the axle 4 away from the gearbox 3. A pressure sensor 15 is embedded on the surface of the contact plate 14. A wheel 5 is integrally formed on the outer ring side of the axle 4, and a return guide wheel 13 fixed to the base 8 is provided below the wheel 5. The contact plate 14 is used to connect the carbon brush structure of the grounding return device under test, and the pressure sensor 15 is used to connect to an external data acquisition system to monitor the axial pressure on the carbon brush structure in real time.

[0023] like Figure 1-3 As shown, the servo motor 12 can drive the lead screw 10 to rotate, causing the sliding seat 2 to move laterally along the guide post 9, which in turn causes the wheel axle 4 to move axially, thereby causing the contact plate installed at the end of the wheel axle 4 to contact the carbon brush structure, so that the load-bearing capacity of the carbon brush structure can be detected.

[0024] The outer ring of the axle 4 is integrally formed with a wheel 5, and a return guide wheel 13 is installed on the lower side of the wheel 5.

[0025] like Figure 1 As shown, the return guide wheel 13 can contact the wheel 5 to support the wheel 5, and at the same time, it can guide the current flowing on the return device to the ground.

[0026] A support frame 6 is provided at the end of the wheel axle 4 away from the gearbox 3. The lower end of the support frame 6 is fixedly connected to the base 8. Bolt holes 7 are provided on the support frame 6.

[0027] The sliding seat 2 is connected to the housing of the motor 1 by bolts, and the sliding seat 2 is connected to the guide column 9 by a sliding bearing.

[0028] The lead screw nut 11 is connected to the sliding seat 2 by bolts, and the return guide wheel 13 is connected to the base 8 by bolts.

[0029] The lower end of the support frame 6 is connected to the base 8 by bolts, and an insulating layer is installed between the lower end of the support frame 6 and the base 8.

[0030] The structure of a wheel grounding return current device for rail vehicles typically includes the following main parts:

[0031] (1) Return Module: This is the core component of the grounding return device, typically installed on the axle box of a vehicle and kept stationary. It is equipped with springs and carbon brushes, with the carbon brushes maintaining a frictional connection with the rotating module via the springs. The function of the springs is to ensure that the carbon brushes and the rotating module always maintain good contact, thereby ensuring stable current transmission;

[0032] (2) Rotation module: It is fixed to the vehicle's wheelset axle and rotates synchronously with the wheelset axle during operation;

[0033] (3) Connecting cable: It is used to connect the grounding return device to the vehicle's electrical system to ensure that the current can return smoothly.

[0034] The working principle of the urban rail single-car grounding return current test device provided by this utility model is as follows: Figures 1-3As shown, during use, the housing of the grounding return device is fixed to the bolt holes 7 on the support frame 6. The carbon brush structure and contact plate 14 of the grounding return device are arranged close to each other in a manner parallel to the extension direction of the wheel axle 4. The motor 1 drives the wheel axle 4 to rotate after the speed is changed by the gearbox 3, so that the end face of the wheel axle is connected to the carbon brush structure through the contact plate 14, thereby guiding the current. The current flows through the wheel axle 4 and the wheel 5 to the return guide wheel 13, and then the current flows to the grounding structure. The servo motor 12 can drive the lead screw 10 to rotate, so that the sliding seat 2 moves laterally along the guide column 9, thereby causing the wheel axle 4 to move axially, so that the contact plate 14 installed at the end of the wheel axle 4 contacts the carbon brush structure, and the bearing capacity of the carbon brush structure is detected.

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0036] Example

[0037] See Figures 1-3 This embodiment provides a grounding return current test device for a single-car urban rail vehicle, including a base 8, a sliding seat 2, a servo motor 12, a lead screw 10, a guide column 9, a lead screw nut 11, a motor 1, a gearbox 3, a wheel axle 4, a contact plate 14, a pressure sensor 15, a wheel 5, a return current guide wheel 13, a support frame 6, and an insulation layer 17. The connection relationships of each component are as follows:

[0038] The sliding seat 2 is sleeved on the guide column 9 through a sliding bearing and is fixedly connected to the lead screw nut 11 by bolts; the end of the wheel axle 4 away from the gearbox 3 is coaxially fixed to the contact plate 14, and the surface of the contact plate 14 is embedded with a pressure sensor 15; the lower end of the support frame 6 is fixed to the base 8 through an insulating layer 17, and bolt holes 7 are opened on it for fixing the housing of the grounding return device to be tested; the return guide wheel 13 is bolted to the base 8 and keeps in contact with the wheel 5 to conduct current.

[0039] The experimental procedure is as follows:

[0040] 1. Install the component to be tested:

[0041] Position the carbon brush structure of the grounding return device under test onto the surface of contact plate 14, ensuring that the carbon brush structure forms an electrical connection with the contact plate; and

[0042] The housing of the return current device is fixed by the bolt holes 7 of the support frame 6 to prevent the grounding return current device under test from shifting during the test.

[0043] 2. Dynamic testing:

[0044] Current conduction simulation: Starting motor 1 drives wheel axle 4 to rotate via transmission 3 (simulating vehicle operating conditions). Current conducts along the following path:

[0045] The carbon brush structure of the grounding return device under test → contact plate 14 → wheel axle 4 → wheel 5) → return guide wheel 13 → grounding;

[0046] Axial force test: Start the servo motor 12 to drive the lead screw 10 to rotate, which forces the sliding seat 2 to move laterally along the guide post 9, and drives the wheel axle 4 to generate axial displacement;

[0047] The contact plate 14 moves synchronously with the wheel axle 4. Since the grounding return device under test is fixed to the support frame, the contact plate 14 will apply axial pressure to the carbon brush structure of the grounding return device under test.

[0048] Pressure sensor 15 collects axial pressure data on the carbon brush structure in real time and transmits it to an external data acquisition system (such as a PLC or computer) via wires.

[0049] Performance evaluation

[0050] Mechanical performance: Analyze the fluctuation data collected by pressure sensor 15 to evaluate the load-bearing characteristics and wear trend of the carbon brush structure under axial movement conditions;

[0051] Electrical performance: Monitor current conduction stability (e.g., using a series ammeter) and verify the conductivity reliability of the grounding return device under mechanical vibration.

[0052] Technical effect verification

[0053] Axial displacement accuracy control: The closed-loop control of servo motor 12 can achieve precise adjustment of displacement (such as ±0.1mm) to simulate the amount of movement under different working conditions;

[0054] Integrated testing: The simultaneous acquisition of pressure and current data provides multi-dimensional basis for predicting the lifespan of carbon brush structures.

[0055] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A grounding return current test device for a single-car urban rail vehicle, comprising a base (8), characterized in that: A sliding seat (2) is installed on the upper side of the base (8). Guide columns (9) are symmetrically installed in a pre-set groove on the upper part of the base (8). A lead screw (10) is installed between the symmetrically installed guide columns (9). A lead screw nut (11) is installed on the lead screw (10). A servo motor (12) is installed at one end of the lead screw (10). The sliding seat (2) is fixedly connected to the lead screw nut (11) and connected to the guide column (9) through a sliding bearing. A motor (1) is installed on the upper side of the sliding seat (2). A gearbox (3) is installed at the output end of the motor (1). 3) The output end is equipped with a wheel axle (4), and the end of the wheel axle (4) away from the gearbox (3) is coaxially and detachably connected to a contact plate (14); a pressure sensor (15) is embedded on the surface of the contact plate (14); a wheel (5) is integrally formed on the outer ring side of the wheel axle (4), and a return guide wheel (13) fixed to the base (8) is provided below the wheel (5), wherein: the contact plate (14) is used to connect the carbon brush structure of the grounding return device to be tested, and the pressure sensor (15) is used to connect to an external data acquisition system, thereby monitoring the axial pressure on the carbon brush structure in real time.

2. The urban rail single-car grounding return current test device according to claim 1, characterized in that: The axle (4) is provided with a support frame (6) at the end away from the gearbox (3) via a sliding bearing, and the lower end of the support frame (6) is fixed on the base (8).

3. The urban rail single-car grounding return current test device according to claim 2, characterized in that: The support frame (6) has bolt holes (7) for fixing the housing of the grounding return device to be tested.

4. The urban rail single-car grounding return current test device according to claim 1, characterized in that: The sliding seat (2) is connected to the housing of the motor (1) by bolts, and the sliding seat (2) is connected to the guide column (9) by a sliding bearing.

5. The urban rail single-car grounding return current test device according to claim 1, characterized in that: The lead screw nut (11) is connected to the sliding seat (2) by bolts, and the return guide wheel (13) is connected to the base (8) by bolts.

6. The urban rail single-car grounding return current test device according to claim 2, characterized in that: The lower end of the support frame (6) is connected to the base (8) by bolts, and an insulating layer is installed between the lower end of the support frame (6) and the base (8).

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