A bogie equalization test system for metro acceptance

Abstract

The application provides a bogie equalization test system for metro acceptance, and relates to the technical field of bogie testing. The system comprises a supporting platform, a plurality of weighing units, a load-carrying moving device, a suspension device, a fine positioning device, and a position-falling control and detection device. The load-carrying moving device is used to receive the bogie from hoisting equipment and can move along the supporting platform to above the weighing units; the suspension device is arranged below the load-carrying moving device and is used to suspend the load-carrying moving device after it moves to above the weighing units; the fine positioning device is arranged between the load-carrying moving device and the weighing units and is used to precisely adjust the relative position of the bogie and the weighing units in the suspended state, so that each wheel is aligned with the corresponding weighing unit; the position-falling control and detection device is connected with the weighing units and the load-carrying moving device respectively and is used to control the weighing units to be lifted in sequence to stably receive the bogie and detect whether the bogie accurately falls into the preset limiting position.

Description

Technical Field

[0001] This application relates to the field of bogie testing technology, and in particular to a bogie equalization test system for subway acceptance. Background Technology

[0002] After a subway car is manufactured or overhauled, a bogie balancing test is required to verify the assembly quality of its components and the uniformity of wheel weight distribution. Bogie balancing tests are typically conducted using a dedicated testing system.

[0003] In related technologies, a typical bogie balancing test system commonly employs a hoisting method when placing the bogie onto the weighing unit of the test system. Specifically, an overhead crane or bridge crane is used to lift the bogie from the storage area and move it above the support platform of the test system. Then, through visual observation and remote control fine-tuning by operators, the bogie is slowly lowered until each wheel falls onto its corresponding weighing unit. The weighing unit is typically equipped with limit seats and limit blocks to restrict wheel position. After the wheels are lowered into place, they contact these limit structures, thereby achieving the bogie's positioning on the test system.

[0004] However, the aforementioned bogie balancing test system still has the following shortcomings. Due to the large overall weight of the bogie and the flexible swinging of the wire ropes or slings during hoisting, operators can only rely on visual observation for alignment, making it difficult to simultaneously and accurately align all four wheels with the limiting structures on the multiple weighing units below. Furthermore, when the bogie descends close to the weighing units, the wheels often collide or scrape against the limiting seats, generating significant impact loads. This impact can not only damage the delicate weighing sensors inside the weighing units, leading to decreased measurement accuracy, but may also cause the bogie to be tilted or not fully in place after being lowered, affecting the accuracy of subsequent test data. In addition, repeated impact loads accelerate the mechanical wear of the test system, reducing the equipment's service life. Summary of the Invention

[0005] This application provides a bogie equalization test system for subway acceptance, which solves the problems of flexible swaying and inaccurate positioning during hoisting, and the large impact load generated when the hoisted bogie is lowered, which accelerates the mechanical wear of the test system.

[0006] The technical solution adopted in the embodiments of this application is as follows: In a first aspect, embodiments of this application provide a bogie balancing test system for subway acceptance, which includes a support platform for placing the bogie and multiple weighing units connected above the support platform for supporting the bogie wheels respectively, and further includes; A carrying and moving device is used to receive the bogie from the hoisting equipment and is capable of moving along the supporting platform to above the weighing unit; A suspending device is disposed below the load-bearing mobile device or on the upper surface of the supporting platform, and is used to suspend the load-bearing mobile device after it travels to the top of the weighing unit to reduce its movement resistance. A precision positioning device is disposed between the load-bearing moving device and the weighing unit, and is used to precisely adjust the relative position between the bogie and the weighing unit when the load-bearing moving device is suspended, so that each wheel is aligned with the corresponding weighing unit. A positioning control and detection device is connected to the weighing unit and the load-bearing moving device, respectively, for controlling the weighing unit to rise sequentially to smoothly support the bogie, and detecting whether the bogie accurately falls into the preset limit position.

[0007] By adopting the above technical solution, the load-bearing moving device first receives the bogie from the hoisting equipment, avoiding direct hard contact between the bogie and the weighing unit; after the suspension device lifts the load-bearing moving device, the precision positioning device can precisely adjust the relative position of the bogie and the weighing unit under low friction, reducing the position deviation caused by coarse positioning during hoisting; the placement control and detection device controls the weighing unit to rise sequentially to receive the bogie, so that the load is transferred smoothly, and detects whether the bogie falls accurately into the limit position, thereby improving the safety and alignment accuracy of bogie placement.

[0008] In one optional implementation, the load-bearing moving device includes a frame, four Mecanum wheels, four lifting outriggers, and four thick guide posts; the Mecanum wheels are mounted on the bottom of the frame and are used to drive the load-bearing moving device to move omnidirectionally on the support platform; the lifting outriggers are mounted at the four corners of the frame and are connected to lifting frames for adjusting the height and level of the frame; the thick guide posts are foldably disposed at the four corners of the frame, and the frame is provided with a lifting mechanism for controlling the lifting of the Mecanum wheels.

[0009] By adopting the above technical solutions, the lifting outriggers can independently adjust the height of the four corners of the chassis. On the one hand, this compensates for unevenness of the ground or supporting platform, ensuring that the bogie maintains a horizontal posture during transportation and reducing uneven loading caused by tilting. On the other hand, during the lowering process, the weight of the bogie can be smoothly transferred to the weighing unit by retracting the outriggers, further reducing impact. The foldable thick guide column is erected during hoisting, which can guide the bogie during lowering to slide into the coarse positioning area on the chassis, relaxing the alignment accuracy requirements of the hoisting operation, reducing the difficulty of hoisting and operation time, and at the same time reducing the effect of hard collision between the bogie and the chassis.

[0010] In one optional implementation, the lifting mechanism of the Mecanum wheel includes a DC geared motor, a vertically mounted ball screw, and a linear guide rail. The DC geared motor drives the ball screw to rotate, and the nut of the ball screw is fixedly connected to the wheel assembly mounting plate on which the Mecanum wheel is mounted. The wheel assembly mounting plate slides up and down along the linear guide rail. When switching to the air cushion suspension mode, the DC geared motor drives the ball screw to move the wheel assembly mounting plate upward, causing the Mecanum wheel to detach from the support platform surface. When switching back to the wheel-walking mode, the DC geared motor drives the wheel assembly mounting plate downward, causing the Mecanum wheel to re-contact the support platform surface.

[0011] By adopting the above technical solution, when the air cushion suspension mode is activated, the Mecanum wheels can be actively retracted upwards, allowing the frame to be supported by the air membrane. This reduces residual friction between the wheel structure and the ground, providing an ideal fine-tuning environment for the precision positioning device and improving the accuracy and response speed of precision positioning. Simultaneously, the ball screw has a self-locking characteristic, enabling the Mecanum wheels to maintain a locked position in both retracted and extended states, eliminating the need for additional braking devices and simplifying the system structure. The linear guide rail ensures verticality and resistance to lateral forces during the lifting process; even under bogie off-center loading, the Mecanum wheels will not jam or tilt. The lifting mechanism and the air cushion suspension device work together to achieve both the efficient transport capability of wheel drive and the high-precision fine-tuning capability of air cushion suspension.

[0012] In one optional implementation, the suspension device is an air cushion suspension module, which is located at the bottom of the vehicle frame. When the load-bearing mobile device travels above the weighing unit, the air cushion suspension module introduces high-pressure gas between the support platform and the vehicle frame to form an air film that lifts the load-bearing mobile device. At the same time, the Mecanum wheels retract upward through their respective lifting mechanisms, so that the vehicle frame is completely supported by the air film.

[0013] By adopting the above technical solution, the air cushion suspension module suspends the entire bogie and its supporting mobile device by forming an extremely thin air film between the chassis and the supporting platform, thereby reducing the coefficient of friction between the chassis and the supporting platform. This low-friction state provides ideal working conditions for the precision positioning device, resulting in smoother, more accurate, and faster positioning actions, significantly reducing the difficulty and time required for precision positioning. Simultaneously, the air film has the characteristic of uniform load-bearing, automatically adapting to the shift in the bogie's center of gravity, keeping the chassis level in the suspended state and reducing tilting caused by localized overload. The linkage with the Mecanum wheel retraction action ensures that no wheeled components contact the ground during suspension, achieving the effect of reducing residual friction interference with precision positioning.

[0014] In one optional implementation, the precision positioning device includes at least two industrial cameras, multiple reference targets, and a fine-tuning platform. The industrial cameras are mounted on the load-bearing moving device and face the weighing unit. The reference targets are fixed to the upper surface of each weighing unit. The fine-tuning platform is disposed between the load-bearing moving device and the bogie. The industrial cameras capture images of the reference targets and the bogie wheels. The positional deviation between the wheels and the corresponding weighing units is calculated through image processing. The fine-tuning platform drives the bogie to move and rotate in the horizontal plane according to the positional deviation until each wheel is precisely aligned with the corresponding weighing unit.

[0015] By employing the above technical solution, images of the benchmark target and bogie wheels are acquired in real time using industrial cameras. Image processing technology is then used to calculate the positional deviation between the two, which is then compensated by a fine-tuning platform, achieving fully automatic, closed-loop precision alignment. The layout of at least two industrial cameras covers both ends of the bogie, simultaneously detecting and correcting translational and rotational deviations, ensuring that all wheels are synchronously aligned with their corresponding weighing units. The fine-tuning platform is positioned between the load-bearing moving device and the bogie, making the precision positioning action independent of the main body of the load-bearing moving device, mitigating the problems of high inertia and slow response caused by moving the entire frame. This improves the reliability of the test data.

[0016] In one optional implementation, the positioning control and detection device includes a sequential positioning controller, which is electrically connected to the lifting drive of each weighing unit. The sequential positioning controller is configured to: after the bogie is precisely aligned with the weighing unit, first control some weighing units located on the same side of the bogie to rise to contact the wheel, then control the weighing units on the other side to rise to contact the wheel, and finally control all weighing units to synchronously descend to a preset test height, thereby smoothly transferring the bogie from the load-bearing moving device to the weighing unit.

[0017] By adopting the above technical solution, a phased and side-by-side lifting sequence is used: first, some weighing units on the same side rise to contact the wheels. Since there are fewer contact points at this stage, the pressure at each contact point is easier to control. After that side has stabilized under load, the weighing units on the other side rise to contact the wheels. At this point, the wheels on the other side, supported by one side, slowly descend, reducing the impact of free fall. Finally, all weighing units descend synchronously to the test height, completing a smooth transfer of load from the load-bearing moving device to the weighing units. This effectively disperses the instantaneous load peaks during the descent process, ensuring that the force borne by each weighing unit remains within its design range and thus protecting the precision sensors.

[0018] In one optional implementation, the upper surface of each weighing unit is provided with two limiting seats for restricting the wheel tread and one limiting block for restricting the outer end face of the wheel; the positioning control and detection device further includes a multi-positioning detection component, which includes a pressure film sensor installed on the limiting seat, an airtight detection micro-hole opened in the contact area between the limiting seat and the wheel tread, and laser beam switches disposed on both sides of the weighing unit; when the pressure film sensor detects that the pressure exceeds a preset threshold, the air pressure rises to a preset range after gas is introduced into the airtight detection micro-hole, and the beam of the laser beam switch is blocked by the wheel flange, the multi-positioning detection component determines that the bogie has been accurately positioned on the weighing unit.

[0019] By adopting the above technical solution, the pressure diaphragm sensor directly detects the contact pressure between the tread and the limit seat, ensuring the existence of actual positive pressure; the airtightness detection micro-orifice judges whether the contact surface is completely sealed by air pressure changes, and can identify abnormal situations such as only partial contact or foreign objects raising the wheel; the laser beam switch detects whether the wheel flange is in the correct height position, confirming that the wheel is not suspended or excessively sunken. Only when all three conditions are met simultaneously does the system determine that the positioning is accurate, thereby reducing the risk of incorrect test data or even equipment damage due to improper positioning.

[0020] In one optional implementation, an elastic floating pad is provided between the limiting seat and the upper surface of the weighing unit. The elastic floating pad is used to absorb the height tolerance of each weighing unit when it rises and contacts the wheel. The elastic floating pad is a composite structure of silicone rubber and metal spring.

[0021] By adopting the above technical solution, unavoidable tolerances exist in the upper surface height of each weighing unit, the machining height of the limit seat, and the actual contour of the wheel tread during actual manufacturing and installation. When multiple weighing units rise simultaneously to support the bogie, the accumulation of these minute tolerances may cause some limit seats to contact the wheel before others, resulting in local overload or slight tilting of the bogie. The elastic floating shim adopts a composite structure of silicone rubber and metal spring, which has both the buffering and vibration absorption characteristics of rubber and the stable rebound capability of spring. This shim can generate controllable micro-compression when the limit seat is compressed, thereby automatically compensating for the height differences between each contact point, making the contact pressure between each wheel and the limit seat more uniform, and achieving the effect of reducing the cumulative effect of tolerances with simple mechanical components.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The pre-positioning of the bogie by the load-bearing moving device reduces the direct hard collision between the bogie and the weighing unit in traditional hoisting methods. After the suspension device lifts the load-bearing moving device, the precision positioning device completes precise alignment under low friction, effectively reducing the positional deviation caused by coarse positioning during hoisting, and significantly improving the safety and alignment accuracy of bogie placement; 2. The bogie is omnidirectionally and flexibly transported and its horizontal attitude adjusted by utilizing Mecanum wheels and lifting outriggers. The thick guide columns relax the hoisting alignment accuracy requirements to the centimeter level, reducing the difficulty of operation. The air cushion suspension module works in conjunction with the Mecanum wheel lifting mechanism to keep the frame in an ultra-low friction state during precise positioning. The positioning action is smooth and responsive. At the same time, the uniform load-bearing characteristics of the air film automatically adapt to the center of gravity shift, ensuring the stability of the suspension state. 3. By using a sequential placement controller to control the weighing units on both sides and in stages to receive the bogies in sequence, the instantaneous load peak during the placement process is effectively dispersed, achieving a smooth load transfer. The multi-stage placement detection component integrates three independent methods: pressure membrane detection, airtightness detection, and laser beam detection. Only when all three conditions are met simultaneously is the placement considered accurate, reducing test data errors or equipment damage caused by improper placement and significantly improving the reliability of the test. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a bogie balancing test system used for subway acceptance testing.

[0024] Figure 2 This is a partial structural diagram of the mobile device.

[0025] Figure 3 This is a structural diagram of the lifting mechanism.

[0026] Figure 4 This is a structural diagram of the weighing unit. Explanation of reference numerals in the attached drawings: 1. Supporting platform; 2. Weighing unit; 3. Load-bearing moving device; 4. Chassis; 5. Mecanum wheel; 6. Lifting frame; 7. Lifting outrigger; 8. Coarse guide column; 9. Ball screw; 10. Linear guide rail; 11. Limit seat; 12. Limit stop; 13. Reference target; 14. Industrial camera. Detailed Implementation

[0027] The present application will be further described in detail below with reference to all the accompanying drawings in the embodiments of the present application.

[0028] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after the connection. It should be understood that when component A is fixedly connected to component C via component B, changes in the relative positional relationship due to deformation of components A, B, and C are permissible. The integrated structure obtained by the two components through a one-piece molding process means that during the formation of one of the two components, that component is connected to the other component, without requiring further processing (such as bonding, welding, snap-fit ​​connections, or screw connections) to connect the two components.

[0029] The directional terms mentioned in the embodiments of this application, such as "upper", "lower", "side", etc., are only for reference to the direction of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0030] The term "multiple" refers to at least two. The term "more than" includes the stated number. The term "and / or" describes a relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0031] This application discloses a bogie balancing test system for subway acceptance.

[0032] Reference Figure 1A bogie balancing test system for subway acceptance includes a support platform 1 for placing the bogie. The support platform 1 is a frame structure welded from high-strength steel, with a flat support surface on top to support subsequent components.

[0033] Eight weighing units 2 are connected above the support platform 1. The number of these weighing units 2 matches the number of wheels of the bogie to be tested, and each weighing unit 2 is used to support one wheel.

[0034] Each weighing unit 2 includes a support base, a lifting drive component, and a weighing platform. The support base is fixed on the support platform 1, the lifting drive component is installed on the support base and extends upward, and the weighing platform is connected to the extension end of the lifting drive component and can move up and down under the drive of the lifting drive component.

[0035] Reference Figure 1 and Figure 4 The weighing platform is equipped with multiple load cells to measure the vertical load applied to it by the wheels. In addition, each weighing unit 2 has two limit seats 11 arranged at intervals along the front-rear direction of the bogie on its upper surface, and a limit stop 12 located outside the limit seats 11.

[0036] The top of the limiting seat 11 has a limiting surface that slopes downwards to the adjacent side, used to contact the tread of the wheel and restrict the wheel's rolling in the front-rear direction; the limiting block 12 protrudes upwards and abuts against the outer end face of the wheel to restrict the wheel's movement in the axial direction. An elastic floating pad is also provided between the limiting seat 11 and the upper surface of the weighing unit 2. This elastic floating pad adopts a composite structure of silicone rubber and metal spring, which can generate controllable micro-compression when compressed, thereby automatically compensating for the height differences between various contact points.

[0037] Reference Figure 1 The system also includes a load-bearing moving device 3, a suspension device, a precision positioning device, and a placement control and detection device. Among them, the load-bearing moving device 3 is used to receive the bogie from the hoisting equipment and can move along the support platform 1 to above the weighing unit 2.

[0038] Reference Figure 1 and Figure 2 The supporting moving device 3 includes a frame 4, four Mecanum wheels 5, four lifting outriggers 7, and four coarse guide columns 8. The frame 4 is welded from steel profiles with a rectangular cross section, and its upper part has a lifting frame 6 for placing the bogie. The lifting frame 6 has coarse positioning grooves that conform to the bottom contour of the bogie.

[0039] Four Mecanum wheels 5 are respectively installed at the four corners of the bottom of the frame 4. Each Mecanum wheel 5 is equipped with an independent drive motor. By controlling the speed and direction of each motor, the frame 4 can move in all directions on the support platform 1, including forward, backward, lateral translation and rotation in place.

[0040] Reference Figure 2 and Figure 3 Four lifting outriggers 7 are also installed at the four corners of the frame 4. Each lifting outrigger 7 includes a servo motor, a ball screw 9 and a telescopic sleeve. The servo motor drives the ball screw 9 to rotate, which in turn drives the telescopic sleeve to extend and retract, thereby independently adjusting the height of the corresponding corner of the frame 4.

[0041] Reference Figure 2 Four thick guide posts 8 are foldably set at the four corners of the frame 4. When hoisting the bogie, the operator flips the thick guide posts 8 upward to the upright position. The inner side of each thick guide post 8 is an outwardly expanding slope, forming a trumpet-shaped guide inlet. When the bogie is hoisted and lowered by the overhead crane, even if there is a large horizontal deviation between the bogie and the frame 4, the bottom of the bogie will first contact the slope of the thick guide post 8 and automatically slide into the thick positioning groove on the frame 4 under the guidance of the slope.

[0042] Reference Figure 1 and Figure 2 The suspension device is located below the load-bearing mobile device 3, and the suspension device adopts an air cushion suspension module. When the load-bearing mobile device 3 travels above the weighing unit 2, the air cushion suspension module introduces high-pressure gas between the support platform 1 and the frame 4, forming an extremely thin air film between the frame 4 and the support platform 1, which suspends the load-bearing mobile device 3 together with the bogie on it.

[0043] To reduce residual friction between the Mecanum wheel 5 and the supporting platform 1 in the suspended state, each Mecanum wheel 5 is also equipped with an independent lifting mechanism.

[0044] Reference Figure 2 and Figure 3 The lifting mechanism includes a DC geared motor, a vertically mounted ball screw 9, and a linear guide rail 10. The output shaft of the DC geared motor is connected to one end of the ball screw 9, and the nut of the ball screw 9 is fixedly connected to the wheel assembly mounting plate on which the Mecanum wheel 5 is mounted. The wheel assembly mounting plate is also slidably engaged with the linear guide rail 10 via a slider.

[0045] Reference Figure 1 and Figure 4The precision positioning device is located between the load-bearing moving device 3 and the weighing unit 2, and is used to precisely adjust the relative position of the bogie and the weighing unit 2 while the load-bearing moving device 3 is suspended. The precision positioning device includes two industrial cameras 14, multiple reference targets 13, and a fine-tuning platform.

[0046] Reference Figure 1 and Figure 2 An industrial camera 14 is mounted on a frame 4 that supports the mobile device 3, with its lens facing the weighing unit 2 on the support platform 1; a reference target 13 is fixed to the upper surface of each weighing unit 2, and each reference target 13 has a unique coding pattern to facilitate camera identification and positioning.

[0047] The fine-tuning platform is located between the frame 4, which carries the moving device 3, and the bogie. This fine-tuning platform can be a three-degree-of-freedom translational rotary table driven by piezoelectric ceramics, which can realize translation in two orthogonal directions and rotation around the vertical axis in the horizontal plane.

[0048] Reference Figure 1 The positioning control and detection device is connected to both the weighing unit 2 and the load-bearing moving device 3. It controls the weighing units 2 to rise sequentially to smoothly support the bogie and detects whether the bogie accurately falls into the preset limit position. The positioning control and detection device includes a sequential positioning controller and a multi-positioning detection component. The sequential positioning controller is electrically connected to the lifting drive of each weighing unit 2 and has preset control logic.

[0049] Reference Figure 1 and Figure 4 The multiple positioning detection component is used to verify whether the bogie is accurately positioned. The component includes a pressure film sensor installed on the limit seat 11, an airtight detection micro-hole opened in the contact area between the limit seat 11 and the wheel tread, and laser beam switches set on both sides of the weighing unit 2.

[0050] Reference Figure 4 The pressure diaphragm sensor is a thin-film resistive sensor. When the wheel tread presses against the limit seat 11, the sensor outputs a pressure signal. The micro-orifice for airtightness detection has a very small aperture. It is connected to an external micro air pump and pressure switch via a flexible tube embedded inside the weighing platform. Before the wheel is seated, the air pump introduces low-pressure gas into the micro-orifice. When the wheel is correctly seated, the micro-orifice is completely sealed by the tread, the air pressure rises to the preset range, and the pressure switch closes. If the wheel is tilted or not fully seated, the micro-orifice is not sealed, and air pressure cannot be established.

[0051] Reference Figure 1The laser beam switch includes a transmitter and a receiver, installed on the front and rear sides of the weighing unit 2, respectively. Its beam height is set to the lowest point of the wheel flange when the bogie is correctly positioned. When the bogie is in place, the wheel flange precisely blocks the beam, interrupting the signal from the receiver. Only when the pressure film sensor, the pneumatic switch of the airtightness detection micro-orifice, and the laser beam switch all meet the conditions simultaneously will the multi-positioning detection component determine that the bogie has been accurately positioned on the weighing unit 2 and allow the subsequent balancing test to begin; otherwise, the system issues an alarm signal, prompting the operator to check.

[0052] The implementation principle of a bogie balancing test system for subway acceptance according to an embodiment of this application is as follows: the bogie is hoisted above the load-bearing moving device 3 by an overhead crane, and the coarse guide column 8 guides the bogie to fall into the groove of the frame 4 to achieve coarse positioning. The load-bearing moving device 3 travels to above the weighing unit 2.

[0053] The air cushion suspension module is activated, and at the same time, the Mecanum wheel 5 lifting mechanism retracts the wheel set, so that the frame 4 is suspended on the air membrane.

[0054] The precision positioning device identifies positional deviations using an industrial camera 14 and a reference target 13, and drives a fine-tuning platform to precisely align the wheels with each weighing unit 2.

[0055] The sequential placement controller first controls one side of the weighing unit 2 to rise and contact the wheel, then controls the other side to rise, and finally all weighing units 2 synchronously descend to the test height, completing the smooth transfer of load. The multi-positioning detection component confirms that the wheel is accurately seated in the limiting seat 11 through triple signals of pressure membrane, airtight micropores and laser beam, before the equalization test can begin.

[0056] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other, and any combination of features in different embodiments is also within the protection scope of this application. That is to say, the multiple embodiments described above can also be arbitrarily combined according to actual needs.

[0057] It should be noted that all the above-mentioned figures are exemplary illustrations of this application and do not represent the actual size of the product. Furthermore, the dimensional proportions between the components in the figures are not intended to limit the actual product of this application. The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bogie balancing test system for subway acceptance, comprising a support platform (1) for placing the bogie and multiple weighing units (2) connected above the support platform (1) for supporting the bogie wheels respectively, characterized in that: Also includes; The carrying moving device (3) is used to receive the bogie from the hoisting equipment and can move along the supporting platform (1) to above the weighing unit (2); A suspension device is provided below the carrying mobile device (3) or on the upper surface of the supporting platform (1) to suspend the carrying mobile device (3) after it travels to the weighing unit (2) to reduce its movement resistance. A precision positioning device is provided between the load-bearing moving device (3) and the weighing unit (2) for precisely adjusting the relative position between the bogie and the weighing unit (2) in the suspended state of the load-bearing moving device (3) so that each wheel is aligned with the corresponding weighing unit (2). The positioning control and detection device is connected to the weighing unit (2) and the carrying moving device (3) respectively. It is used to control the weighing unit (2) to rise in sequence to smoothly support the bogie and to detect whether the bogie falls accurately into the preset limit position.

2. The bogie balancing test system for subway acceptance as described in claim 1, characterized in that: The carrying and moving device (3) includes a frame (4), four Mecanum wheels (5), four lifting legs (7), and four thick guide columns (8); the Mecanum wheels (5) are installed at the bottom of the frame (4) and are used to drive the carrying and moving device (3) to move omnidirectionally on the support platform (1); the lifting legs (7) are installed at the four corners of the frame (4) and are connected to lifting frames (6) for adjusting the height and level of the frame (4); the thick guide columns (8) are foldably arranged at the four corners of the frame (4) and the frame (4) is provided with a lifting mechanism for controlling the lifting of the Mecanum wheels (5).

3. The bogie balancing test system for subway acceptance as described in claim 2, characterized in that: The lifting mechanism of the Mecanum wheel (5) includes a DC geared motor, a vertically mounted ball screw (9), and a linear guide rail (10); the DC geared motor drives the ball screw (9) to rotate, the nut of the ball screw (9) is fixedly connected to the wheel assembly mounting plate on which the Mecanum wheel (5) is mounted, and the wheel assembly mounting plate slides up and down along the linear guide rail (10).

4. The bogie balancing test system for subway acceptance as described in claim 3, characterized in that: The suspension device is an air cushion suspension module, which is located at the bottom of the frame (4). When the load-bearing moving device (3) travels above the weighing unit (2), the air cushion suspension module introduces high-pressure gas between the support platform (1) and the frame (4) to form an air film that lifts the load-bearing moving device (3). At the same time, the Mecanum wheels (5) retract upward through their respective lifting mechanisms, so that the frame (4) is completely supported by the air film.

5. The bogie balancing test system for subway acceptance as described in claim 1, characterized in that: The precision positioning device includes at least two industrial cameras (14), multiple reference targets (13), and a fine-tuning platform. The industrial cameras (14) are mounted on the load-bearing moving device (3) and face the weighing unit (2). The reference targets (13) are fixed on the upper surface of each weighing unit (2). The fine-tuning platform is located between the load-bearing moving device (3) and the bogie. The industrial cameras (14) capture images of the reference targets (13) and the bogie wheels. The positional deviation between the wheels and the corresponding weighing units (2) is calculated through image processing. The fine-tuning platform drives the bogie to move and rotate in the horizontal plane according to the positional deviation until each wheel is precisely aligned with the corresponding weighing unit (2).

6. The bogie balancing test system for subway acceptance as described in claim 1, characterized in that: The positioning control and detection device includes a sequential positioning controller, which is electrically connected to the lifting drive of each weighing unit (2). The sequential positioning controller is configured to: after the bogie is precisely aligned with the weighing unit (2), first control some weighing units (2) located on the same side of the bogie to rise to contact the wheel, then control the weighing units (2) on the other side to rise to contact the wheel, and finally control all weighing units (2) to descend synchronously to the preset test height, so that the bogie is smoothly transferred from the load-bearing moving device (3) to the weighing unit (2).

7. The bogie balancing test system for subway acceptance as described in claim 6, characterized in that: Each weighing unit (2) has two limiting seats (11) for limiting the wheel tread and one limiting block (12) for limiting the outer end face of the wheel on its upper surface. The positioning control and detection device also includes a multi-positioning detection component, which includes a pressure film sensor installed on the limiting seat (11), an airtight detection micro-hole opened in the contact area between the limiting seat (11) and the wheel tread, and laser beam switches set on both sides of the weighing unit (2). When the pressure film sensor detects that the pressure exceeds a preset threshold, the air pressure rises to a preset range after the airtight detection micro-hole is filled with gas, and the beam of the laser beam switch is blocked by the wheel flange, the multi-positioning detection component determines that the bogie has been accurately positioned on the weighing unit (2).

8. The bogie balancing test system for subway acceptance as described in claim 7, characterized in that: An elastic floating pad is provided between the limiting seat (11) and the upper surface of the weighing unit (2). The elastic floating pad is used to absorb the height tolerance of each weighing unit (2) when it rises and contacts the wheel. The elastic floating pad is a composite structure of silicone rubber and metal spring.

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