A multi-axle special vehicle mass center detection roll test system

Abstract

The present application relates to the technical fields of vehicle roll test, in particular to a mass and centroid detection roll test system for multi-axle special vehicle, which comprises a turnover frame, a detection control system, the turnover frame is provided with an inclination angle sensing unit for measuring the inclination angle thereof; a weighing platform is installed on the turnover frame, the weighing platform is provided with a weighing sensing unit for measuring the weight of the vehicle; the weighing platform comprises a plurality of groups of weighing frames symmetrically installed on both sides of the turnover frame, and a positioning device is fixedly connected between each group of weighing frames and the turnover frame; a hydraulic system is arranged on one side of the turnover frame, the hydraulic system is connected with the turnover frame and used for driving the side roll of the turnover frame; the detection control system is electrically connected with the weighing sensing unit, the inclination angle sensing unit and the hydraulic system. Through the arrangement of the positioning device, a flexible constraint is formed, the force on the weighing sensing unit is ensured to be a pure vertical pressure, the weighing sensor is protected from being damaged, and the measurement accuracy is ensured.

Description

Technical Field

[0001] This invention relates to the field of vehicle roll test technology, and in particular to a roll test system for detecting the center of mass of a multi-axle special vehicle. Background Technology

[0002] Accurate detection of vehicle mass and center of gravity position is a key technical aspect of assessing the driving stability and safety of special vehicles, especially for multi-axle, heavy-duty special vehicles such as fire ladder trucks and military transport vehicles. Current technologies for detecting these vehicles primarily employ the lateral tilt load method for center of gravity measurement. While this has achieved some progress, it still has significant limitations in practical applications.

[0003] Chinese patent CN102620888B discloses a heavy vehicle mass center of gravity detection device, including a foundation pit, a four-degree-of-freedom platform, pressure sensors, a vehicle under test, and a horizontal platform surface. The four-degree-of-freedom platform is installed in the foundation. Multiple pressure sensors are arranged along an Archimedean spiral from the center to the edge on the upper cylindrical portion of the upper platform. A horizontal platform surface covers the pressure sensors, and the vehicle under test is placed on the horizontal platform surface. This device's four-degree-of-freedom platform can rotate along the X, Y, and Z axes. Based on the pressure measured by the pressure sensors at different positions and during rotational motion, the mass and center of gravity of the heavy vehicle are quickly fitted and calculated. The patent points out that most heavy vehicle mass center of gravity detection devices use the tilt-bearing method, which allows for two-degree-of-freedom rotational measurement (X-axis and Y-axis rotation). Furthermore, the pressure sensors are typically evenly arranged and few in number, usually three.

[0004] Although the aforementioned patent improves measurement accuracy by optimizing the sensor arrangement, its four-degree-of-freedom platform structure is complex and has high manufacturing costs. Further improvements are still needed for the attitude control and long-term stability of the weighing platform under large tilt angle conditions. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a tilt test system for detecting the center of mass of multi-axle special vehicles. The system adopts a structure combining a tilting frame and a weighing platform. Through lateral and longitudinal positioning components, the weighing platform is flexibly constrained and its attitude is adjusted. This system can maintain the stability of the weighing platform under large tilt angle conditions, improve the accuracy of the center of mass measurement, and is simple in structure, low in manufacturing cost, and highly applicable.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A roll test system for detecting the center of gravity of a multi-axle special vehicle includes a tilting frame and a detection and control system. The tilting frame is equipped with a tilt angle sensing unit for measuring its tilt angle. A weighing platform is installed on the tilting frame, and the weighing platform is equipped with a weighing sensing unit for measuring the weight of the vehicle. The weighing platform includes several sets of weighing frames symmetrically installed on both sides of the tilting frame. Each weighing frame and tilting frame are hinged together by a positioning device; a hydraulic system is provided on one side of the tilting frame, which is connected to the tilting frame and is used to drive the tilting frame to tilt in the range of 0° to 45°; the detection and control system is electrically connected to the weighing sensing unit, the tilt sensing unit and the hydraulic system; the positioning device includes a lateral positioning component and a longitudinal positioning component.

[0007] Preferably, the lateral positioning component includes a first adjusting screw, both ends of which are screwed with a first universal rotating connector, and each of the first universal rotating connectors is hinged with a first mounting bracket; one end of the lateral positioning component is fixedly connected to the side wall of the tilting frame through the first mounting bracket, and the other end of the lateral positioning component is fixedly connected to the corresponding weighing frame through the first mounting bracket. The longitudinal positioning component includes a second adjusting screw, both ends of which are screwed with second universal rotating connectors, and each of the second universal rotating connectors is hinged with a second mounting bracket; one end of the longitudinal positioning component is fixedly connected to the bottom wall of the corresponding weighing frame through the second mounting bracket, and the other end of the longitudinal positioning component is fixedly connected to the top wall of the tilting frame at the corresponding weighing frame position through the second mounting bracket.

[0008] Preferably, the weighing sensing unit is a weighing sensor assembly disposed on the weighing frame.

[0009] Preferably, the weighing frame includes a steel frame, with a patterned steel plate fixedly covering the upper end of the steel frame, and bearing plates fixed at the four corners of the lower end of the steel frame. Each bearing plate is fixedly connected to a weighing sensor assembly, and the bottom of the weighing sensor assembly is fixedly connected to the tilting frame.

[0010] Preferably, the weighing sensor assembly includes a weighing sensor, one end of which is fixedly connected to a support plate by an upper mounting bolt; the other end of the weighing sensor is fixed to a support device, which is located below the weighing sensor and is fixedly connected to a tilting frame by a lower mounting bolt.

[0011] Preferably, the tilt sensing unit is an angle sensor assembly, which is fixed on the tilting frame.

[0012] Preferably, the tilting frame includes a tilting frame body, an anti-tilt plate is provided on one side of the tilting frame body, and one end of the lateral positioning component is hinged to the side wall of the anti-tilt plate through a first mounting support; hooks are evenly distributed and fixed on the anti-tilt plate, and an mounting frame is provided along the axial direction in the middle of the tilting frame body, on which an anti-slip pull rod assembly is installed; a mounting plate is fixed on one side of the bottom of the tilting frame body, and an angle sensor assembly is fixed on the mounting plate; hinge frames are also evenly distributed on the bottom of the tilting frame body located on one side of the mounting plate.

[0013] Preferably, the angle sensor assembly includes an L-shaped mounting bracket, one side of which is fixedly attached to a mounting plate, and the other side is fixed with an angle sensor. The rotating shaft of the angle sensor is connected to a lifting rod, and a counterweight is fixedly connected to the end of the lifting rod away from the angle sensor.

[0014] Preferably, the hydraulic system includes an independent hydraulic station and a number of engineering cylinders evenly distributed on one side of the bottom of the tilting frame. The independent hydraulic station is connected to each of the engineering cylinders through hydraulic pipelines. One end of the engineering cylinder is hinged to the bottom of the tilting frame, and the other end of the engineering cylinder is hinged in the test pit. The engineering cylinder is located on the side away from the hinged frame.

[0015] Preferably, the detection and control system includes a data acquisition module and a control module; the data acquisition module is used to receive signals from the weighing sensor unit and the tilt sensor unit; the control module is used to control the hydraulic system according to the signals.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention prevents lateral slippage of the weighing frame when the system tilts and longitudinal displacement when the vehicle enters or exits braking by setting lateral positioning components and longitudinal positioning components, thereby achieving zero shear force load on the weighing sensing unit. The adjusting screw in the positioning device can eliminate installation errors, and the universal rotating connector can automatically align itself, so that the upper and lower surfaces of the weighing sensor always keep face-to-face contact, ensuring that the force applied to the weighing sensing unit is a pure vertical pressure, thereby maintaining the attitude stability of the weighing platform under large tilt angle conditions, improving measurement accuracy and long-term reliability.

[0017] (2) The present invention adopts a structure combining a tilting frame and multiple symmetrically arranged weighing frames. The tilting frame is driven by a hydraulic system to achieve a large tilt angle of 0° to 45°. The structure is simple and the manufacturing cost is low. The multiple weighing frames form an automatic adaptation system for the entire wheelbase, which is suitable for multi-axle vehicles. After the vehicle drives in, it is naturally distributed on different independent weighing frames. There is no need to physically move the weighing platform or adjust the front and rear positions of the vehicle, which greatly improves the detection efficiency and versatility. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a roll test system for detecting the center of mass of a multi-axle special vehicle according to the present invention; Figure 2 This is an exploded view of the overall structure of a set of weighing frames corresponding to a roll test system for detecting the center of mass of a multi-axle special vehicle according to the present invention. Figure 3 This is a schematic diagram of the cross-sectional structure of a roll test system for detecting the center of mass of a multi-axle special vehicle according to the present invention; Figure 4 This is a schematic diagram of the lateral positioning component structure of a roll test system for detecting the center of mass of a multi-axle special vehicle according to the present invention; Figure 5 This is a schematic diagram of the longitudinal positioning component structure of a roll test system for detecting the center of mass of a multi-axle special vehicle according to the present invention; Figure 6 This is a schematic diagram of the weighing sensor assembly structure of a roll test system for detecting the center of mass of a multi-axle special vehicle according to the present invention; Figure 7 yes Figure 2 A partially enlarged structural diagram of the weighing frame; Figure 8 yes Figure 2 A partially enlarged structural diagram of the anti-slip pull rod assembly; Figure 9 This is a schematic diagram of the angle sensor assembly structure of a roll test system for detecting the center of mass of a multi-axle special vehicle according to the present invention; Figure 10 This is a schematic diagram of the test structure of a roll test system for detecting the center of mass of a multi-axle special vehicle according to the present invention.

[0019] In the diagram: 100, Tilting frame; 200, Weighing frame; 300, Lateral positioning assembly; 400, Hydraulic system; 600, Longitudinal positioning assembly; 110, Tilting frame body; 120, Anti-tilt plate; 130, Hook; 140, Mounting bracket; 150, Anti-slip tie rod assembly; 160, Mounting plate; 170, Angle sensor assembly; 180, Hinge frame; 151, Clip-on bracket; 152, Clip-on slot; 153, Tie rod; 154, Anti-slip stopper; 171, L-shaped mounting bracket; 172, Angle sensor... 173. Load cell; 174. Counterweight; 210. Steel frame; 220. Patterned steel plate; 230. Bearing plate; 240. Weighing sensor assembly; 241. Weighing sensor; 242. Upper mounting bolt; 243. Bearing device; 244. Lower mounting bolt; 310. First adjusting screw; 320. First universal joint connector; 330. First mounting support; 410. Engineering cylinder; 610. Second adjusting screw; 620. Second universal joint connector; 630. Second mounting support. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention. Furthermore, the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0021] Example Reference Figure 1-10 A tilt test system for detecting the center of gravity of a multi-axle special vehicle includes a tilting frame 100 and a detection and control system. The tilting frame 100 is equipped with a tilt angle sensing unit for measuring its tilt angle. A weighing platform is installed on the tilting frame 100, and the weighing platform is equipped with a weighing sensing unit for measuring the weight of the vehicle. The weighing platform includes several sets of weighing frames 200 symmetrically installed on both sides of the tilting frame 100. Each weighing frame 200 and the tilting frame 100 are hinged together by a positioning device; a hydraulic system 400 is provided on one side of the tilting frame 100, and the hydraulic system 400 is connected to the tilting frame 100 to drive the tilting frame 100 to tilt to the side within the angle range of 0° to 45°; the detection and control system is electrically connected to the weighing sensing unit, the tilt sensing unit and the hydraulic system 400.

[0022] The tilting frame 100 is assembled from C-shaped channel steel, with each part fixedly connected by welding and / or pins. It is used to bear the weight of the vehicle and to install the weighing platform. It has sufficient strength and rigidity to ensure the safety of operators and products during normal use. The weighing platform includes multiple weighing racks 200, symmetrically arranged on both sides of the tilting frame 100, so that the tires on both sides of the vehicle can be parked. When the vehicle is parked, each tire needs to be placed on a different weighing rack 200 to facilitate accurate weighing of the vehicle. The hydraulic system 400 controls one side of the tilting frame 100 to conduct a tilt test, so as to detect the component or whole vehicle mass parameters and the three-dimensional position distribution of the vehicle's center of gravity through the detection and control system. The positioning device is used to prevent the tangential component force generated when the vehicle tilts from damaging the weighing sensing unit.

[0023] The positioning device includes a lateral positioning component 300 and a longitudinal positioning component 600.

[0024] When the vehicle travels onto the weighing platform, the friction of the wheels during braking causes the weighing frame 200 to tend to move horizontally. At this time, the longitudinal positioning component 600 and the tilting frame work together to stop the horizontal movement of the weighing frame 200. The longitudinal positioning component 600 ensures the longitudinal safety of the weighing sensing unit.

[0025] When the system tilts to the side, the horizontal component of the wheel tends to push the weighing frame 200 to tilt and move laterally, generating a downward component. This downward component will cause the weighing sensor unit on the weighing frame 200 to generate a tangential component. At this time, the lateral positioning component 300 and the tilting frame work together to stop the horizontal movement of the weighing frame 200. The lateral positioning component 300 ensures the lateral safety of the weighing sensor unit.

[0026] like Figure 4 As shown, the lateral positioning component 300 includes a first adjusting screw 310, both ends of which are screwed with a first universal rotating connector 320, and each of the first universal rotating connectors 320 is hinged with a first mounting support 330; one end of the lateral positioning component 300 is fixedly connected to the side wall of the tilting frame 100 through the first mounting support 330, and the other end of the lateral positioning component 300 is fixedly connected to the corresponding weighing frame 200 through the first mounting support 330.

[0027] like Figure 5 As shown, the longitudinal positioning component 600 includes a second adjusting screw 610, both ends of which are screwed with second universal rotating connectors 620, and each of the second universal rotating connectors 620 is hinged with a second mounting bracket 630; one end of the longitudinal positioning component 600 is fixedly connected to the bottom wall of the corresponding weighing frame 200 through the second mounting bracket 630, and the other end of the longitudinal positioning component 600 is fixedly connected to the top wall of the tilting frame 100 at the corresponding position of the weighing frame 200 through the second mounting bracket 630.

[0028] The lateral positioning component 300 and the longitudinal positioning component 600 have the same structure. Both the first adjusting screw 310 and the second adjusting screw 610 are double-ended adjusting screws, used to fine-tune the relative position between the weighing frame 200 and the tilting frame 100, eliminating installation errors. The first mounting bracket 330 and the second mounting bracket 630 are both welded to their corresponding tilting frame 100 and weighing frame 200. The first universal rotating connector 320 and the second universal rotating connector 620 are spherical bearings or ball joints. In this embodiment, spherical bearings are used. Due to the spherical bearing connection, the positioning device constitutes a flexible constraint. When the tilting frame 100... When tilted, the spherical bearing allows the adjusting screw to rotate / oscillate freely within a certain angle range; it can also automatically align itself and compensate for machining and installation errors, ensuring that the force remaining on the weighing sensor unit is purely vertical pressure; most importantly, it can completely transfer the lateral shear force generated by tilting and the longitudinal shear force generated during vehicle braking to the tilting frame 100 through the positioning device, without transferring it to the weighing sensor; this is like hanging the weighing frame 200 on the tilting frame 100, so that the weighing sensor unit is only responsible for supporting the weighing frame 200, thereby protecting the weighing sensor unit from shearing damage, achieving zero shear force load on the weighing sensor unit, and ensuring measurement accuracy.

[0029] In this embodiment, the weighing sensing unit is a weighing sensor assembly 240 disposed on the weighing frame 200. The weighing sensing unit is used to measure the mass of the vehicle on the weighing frame.

[0030] like Figure 7 As shown, in this embodiment, the weighing frame 200 includes a steel frame 210, with a patterned steel plate 220 fixedly covering the upper end of the steel frame 210, and bearing plates 230 fixed at the four corners of the lower end of the steel frame 210. Each bearing plate 230 is fixedly connected to a weighing sensor assembly 240, and the bottom of the weighing sensor assembly 240 is fixedly connected to the tilting frame 100.

[0031] The steel frame 210 is used to ensure load-bearing capacity and is welded from C-shaped steel. The patterned steel plate 220 on the top surface is used to make the weighing frame 200 form a plane, which facilitates the entry and exit of vehicles from the weighing platform. The platform size design needs to adapt to vehicles with different wheelbases and is determined according to the actual situation. The bearing plate 230 is used to fix the top of the weighing sensor assembly 240. The bearing plate 230 is welded to the steel frame 210 as a whole.

[0032] like Figure 6As shown, in this embodiment, the weighing sensor assembly 240 includes a weighing sensor 241. One end of the weighing sensor 241 is fixedly connected to the support plate 230 by an upper mounting bolt 242. The other end of the weighing sensor 241 is fixed with a support 243, which is located below the weighing sensor 241. The support 243 is fixedly connected to the tilting frame 100 by a lower mounting bolt 244.

[0033] Multiple sets of weighing sensor assemblies 240 are installed between the tilting frame 100 and the weighing frame 200, jointly enabling the measurement of the vehicle's mass on the weighing platform. In this embodiment, the weighing sensor 241 is a strain gauge type weighing sensor with an accuracy class of not less than C3, and the measuring range is selected according to actual needs. The weighing sensor 241 is fixed to the support plate 230 by upper mounting bolts 242, and its lower end is fixedly connected to the tilting frame 100 by a support 243, forming a stable force transmission path. In practical applications, four weighing sensor assemblies 240 are set under each weighing frame 200, symmetrically distributed at the four corners to ensure uniform force distribution. The weighing sensor 241 adopts fully digital output, and after being collected through a dedicated sensor junction box, it is uniformly transmitted to the acquisition module of the detection and control system.

[0034] In this embodiment, the tilt sensing unit is an angle sensor assembly 170, which is fixed to the tilting frame 100. The tilt sensing unit is used to measure the angle between the weighing platform and the horizontal plane when the vehicle tilts, thus completing the tilt angle measurement.

[0035] like Figure 2 , 3 As shown, in this embodiment, the tilting frame 100 includes a tilting frame body 110. An anti-tilt plate 120 is provided on one side of the tilting frame body 110. One end of the lateral positioning component 300 is hinged to the side wall of the anti-tilt plate 120 through a first mounting support 330. Hooks 130 are evenly distributed and fixed on the anti-tilt plate 120. An mounting frame 140 is provided along the axial direction in the middle of the tilting frame body 110. An anti-slip pull rod assembly 150 is installed on the mounting frame 140. An mounting plate 160 is fixed on one side of the bottom of the tilting frame body 110. An angle sensor assembly 170 is fixed on the mounting plate 160. Hinges 180 are also evenly distributed on the bottom of the tilting frame body 110 located on one side of the mounting plate 160.

[0036] The anti-roll plate 120 is used to mount the hook 130. During the roll test, the hook 130 is fixedly connected to the vehicle with ropes to prevent the vehicle from tipping over and sliding down during a roll. The mounting bracket 140 is used to mount the anti-slip tie rod assembly 150, which also prevents the vehicle from tipping over and sliding down during a roll, thus avoiding accidents. The angle sensor assembly 170 is fixed below the tilting frame body 110. Multiple hinge brackets 180 are used to form a tilting axis, allowing the tilting frame 100 to rotate around a fixed axis.

[0037] like Figure 9 As shown, in this embodiment, the angle sensor assembly 170 includes an L-shaped mounting bracket 171. One side of the L-shaped mounting bracket 171 is attached to and fixed on the mounting plate 160, and the other side is fixed with an angle sensor 172. The rotating shaft of the angle sensor 172 is connected to a hanging rod 173, and a counterweight 174 is fixedly connected to the end of the hanging rod 173 away from the angle sensor 172.

[0038] Angle sensor 172 is used for tilt angle measurement. In this embodiment, angle sensor 172 is a rotary transformer type angle sensor with a measurement accuracy of not less than 0.1° and a measurement range of 0° to 180°. Under the action of gravity, the counterweight 174 keeps the boom 173 vertically downward, with the starting point being zero degrees. When the tilting frame 100 tilts, the L-shaped mounting bracket 171 rotates along with it. Under the action of the counterweight 174, the angle sensor 172 rotates relative to it, thereby outputting an electrical signal to achieve angle measurement. The angle sensor 172 uses analog output, which has high signal accuracy and fast response speed, and can reflect the tilt angle of the tilting frame 100 in real time. After the measurement is completed, when the tilting frame 100 returns to its original position, the angle sensor 172, due to the setting of the counterweight 174, follows the tilting frame 100 to return to its initial angle value, without manual adjustment, making it convenient to use and providing accurate measurement results.

[0039] like Figure 8 As shown, in this embodiment, the anti-slip pull rod assembly 150 includes a snap-fit ​​bracket 151 fixed on the mounting frame 140. The snap-fit ​​bracket 151 is provided with a plurality of snap-fit ​​slots 152. Each weighing frame 200 is provided with two pull rods 153. The pull rods 153 extend radially along the tilting frame 100 to the weighing frame 200. One end of the two pull rods 153 is snapped into the snap-fit ​​slot 152, and the other end passes through the anti-slip stopper 154 and is fixed by fasteners.

[0040] When the tilting frame 100 is in a horizontal position, the tie rod 153 is in a relaxed state, and the asymmetric load cell 200 applies additional restraint. When the tilting frame 100 begins to tilt, if the vehicle tends to slip relative to the load cell 200, the anti-slip stopper 154 will prevent the vehicle's wheels from sliding. At the same time, the tie rod 153 is tightened, transferring the sliding force to the snap-fit ​​bracket 151, and finally to the tilting frame body 110, thereby protecting the load cell assembly 240 from shear force damage and preventing the vehicle from tipping over. The anti-slip stopper 154 uses a rubber-coated steel structure, which provides sufficient blocking force while avoiding damage to the vehicle's tires. The fasteners are made of steel nuts, and the tie rod 153 is made of high-strength threaded rope, which has sufficient tensile strength and fatigue resistance.

[0041] It should be noted that each anti-skid tie rod assembly 150 is installed at the corresponding vehicle tire, and each tire is located between two tie rods 153; with the positioning device, anti-skid tie rod assembly 150 and anti-tilt plate 120, the tilting frame 100 can tilt within a range of 0° to 45°.

[0042] In this embodiment, the hydraulic system 400 includes an independent hydraulic station and a plurality of engineering cylinders 410 evenly distributed on one side of the bottom of the tilting frame 100. The independent hydraulic station is connected to each of the engineering cylinders 410 through hydraulic pipelines. One end of the engineering cylinder 410 is hinged to the bottom of the tilting frame 100, and the other end of the engineering cylinder 410 is hinged in the test pit. The engineering cylinders 410 are located on the side away from the hinge frame 180.

[0043] To drive the tilting frame 100 to perform smooth and controllable lateral tilting movements, this embodiment employs an independent hydraulic system 400. The hydraulic system 400 mainly includes an independent hydraulic station and multiple symmetrically arranged engineering cylinders 410.

[0044] The independent hydraulic power unit includes a motor, hydraulic pump, oil tank, control valve assembly, and corresponding hydraulic pipelines. It is connected to the rodless and rod-side chambers of each engineering cylinder 410 via hydraulic lines, forming a closed-loop hydraulic circuit. The hydraulic pump is a fixed displacement pump with a rated working pressure of 16 MPa, and the flow rate is configured according to system requirements.

[0045] Multiple engineering cylinders 410 are evenly distributed along the length of the tilting frame 100 on one side of its bottom. Specifically, the lower end of each engineering cylinder 410 is hinged to a fixed base pre-cast in the bottom of the test pit by a pin, and the upper end is hinged to a cylinder seat mounting plate pre-set at the bottom of the tilting frame 100 by a pin. In this embodiment, six engineering cylinders 410 are provided, evenly distributed on the bottom side of the tilting frame 100 away from the hinge frame 180. The stroke of each engineering cylinder 410 is designed based on the maximum tilt angle of the tilting frame 100 of 45°, and the rated thrust is calculated and determined based on the total weight of the tilting frame 100 and the maximum load-bearing vehicle.

[0046] The hydraulic system 400 controls the flow and pressure of hydraulic oil entering each engineering cylinder 410 via proportional valves of an independent hydraulic station. This, combined with multi-way diverter valves, enables synchronized movement of each cylinder, allowing the tilting frame 100 to smoothly and uniformly tilt from a horizontal position to any set angle and maintain that angle stably. The hydraulic system 400 is also equipped with safety relief valves, balance valves, and hydraulic locks to ensure that the tilting frame 100 is safely locked in the event of power failure or hydraulic pressure loss, preventing accidental falls that could damage equipment or cause personal injury.

[0047] In this embodiment, the detection and control system includes a data acquisition module and a control module; the data acquisition module is used to receive signals from the weighing sensor unit and the tilt sensor unit; the control module is used to control the hydraulic system 400 according to the signals.

[0048] Specifically, the detection and control system adopts an architecture combining a main control computer and a PLC control box. The acquisition module includes a weighing signal acquisition unit and an angle signal acquisition unit. The weighing signal acquisition unit acquires the output signals of all weighing sensors 241 through a dedicated sensor junction box, while the angle signal acquisition unit acquires the output signals of the angle sensor 172. The control module interacts with the independent hydraulic station via the PLC control box using 485 serial communication and Modbus communication methods, controlling the operation of the hydraulic system 400 in real time.

[0049] The main control computer has built-in dedicated measurement and control software, enabling real-time data acquisition, storage, processing, display, and report output. The system adopts a fully digital programmed calibration method, using standard weights to calibrate the weighing sensors, ensuring measurement accuracy. Based on the wheel load data collected from each weighing frame 200 and the tilt angle data from the tilting frame 100, the measurement and control software calculates the vehicle's total mass, longitudinal center of gravity position, lateral center of gravity position, and vertical center of gravity position using a torque balance algorithm.

[0050] The working process of the mass center of gravity detection and roll test system for multi-axle special vehicles of the present invention is as follows: Vehicle preparation: Drive the vehicle to be tested into the weighing platform at the designated location, ensuring that each tire on both sides of the vehicle is placed on a different weighing rack 200. The tilting rack 100 should be horizontal at this time, with an inclination angle of 0°.

[0051] Initial weighing: After the vehicle comes to a complete stop, the acquisition module of the detection and control system begins to collect the output signals of all weighing sensor components 240, acquiring wheel load data for each wheel in a level state. The main control computer records and stores this data as the reference value for subsequent calculations.

[0052] Roll test preparation: The operator secures the vehicle to the anti-roll plate 120 using hook 130, and the anti-skid tie rod assembly 150 is in standby mode. The detection and control system sets the target roll angle range, for example, 6°~12°.

[0053] Lateral tilting motion: The control module sends a command to the hydraulic system 400 through the PLC control box, the independent hydraulic station is started, and the hydraulic oil enters each engineering cylinder 410 synchronously through the multi-way diversion and collection valve. The piston rods of each cylinder extend synchronously, pushing the tilting frame 100 to tilt slowly and smoothly around the axis of the hinge frame 180.

[0054] Angle monitoring: During the tilting process, the angle sensor assembly 170 monitors the tilt angle of the tilting frame 100 in real time and feeds the signal back to the detection and control system. When the tilt angle reaches the set value, the control module instructs the hydraulic system 400 to stop operating, the hydraulic lock locks, and the tilting frame 100 remains in that tilt angle state.

[0055] Weighing under tilt: After the tilting frame 100 stabilizes at the target tilt angle, the detection and control system dynamically acquires the output signals of all weighing sensor assemblies 240 multiple times to obtain the wheel load data of each wheel under tilt. The lateral positioning assembly 300 and the longitudinal positioning assembly 600 ensure that the weighing frame 200 does not shift, and the weighing sensor 241 is only subjected to vertical pressure and is not affected by shear force.

[0056] Data processing: Based on the collected horizontal wheel load data, lateral wheel load data, tilt angle data, and position parameters of each weighing frame 200, the main control computer calculates the vehicle's total mass, longitudinal center of gravity position, lateral center of gravity position, and vertical center of gravity position using the torque balance equation and center of gravity calculation algorithm.

[0057] Reset: After data acquisition is completed, the control module instructs the hydraulic system 400 to reverse, the piston rod of the engineering cylinder 410 retracts, the tilting frame 100 smoothly resets to a horizontal state, and the operator releases the vehicle from the fixation.

[0058] Vehicle departure: The vehicle leaves the weighing platform, and the test ends. The main control computer generates a test report, including parameters such as vehicle mass and center of gravity position.

[0059] It should be noted that during the above test, the first universal rotating connector 320 and the second universal rotating connector 620 in the positioning device allow the weighing frame 200 to produce a slight adaptive rotation when the tilting frame 100 is tilted, to compensate for geometric deformation, and to ensure that the upper and lower surfaces of the weighing sensor 241 are always in face-to-face contact, achieving zero shear force loading; the anti-slip tie rod assembly 150 automatically tightens when the vehicle tends to slip, and transmits the sliding force to the tilting frame 100 to ensure that the vehicle will not slip or overturn; the angle sensor assembly 170 keeps the hanging rod 173 vertically downward through the counterweight 174, achieving high-precision angle measurement.

[0060] Through the above-described structural design and workflow, this invention achieves high-precision mass centroid detection for multi-axle special vehicles under large tilt angle conditions, and has the advantages of simple structure, low cost, strong applicability, and high measurement accuracy.

[0061] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A roll test system for detecting the center of gravity of a multi-axle special vehicle, comprising a rollover frame (100) and a detection and control system, characterized in that: The tilting frame (100) is equipped with a tilt angle sensing unit for measuring its tilt angle; a weighing platform is installed on the tilting frame (100), and the weighing platform is equipped with a weighing sensing unit for measuring the weight of the vehicle; the weighing platform includes several sets of weighing frames (200) symmetrically installed on both sides of the tilting frame (100). Each weighing frame (200) and the tilting frame (100) are hinged together by a positioning device; a hydraulic system (400) is provided on one side of the tilting frame (100), and the hydraulic system (400) is connected to the tilting frame (100) to drive the tilting frame (100) to tilt to the side within the angle range of 0° to 45°; the detection and control system is electrically connected to the weighing sensing unit, the tilt sensing unit and the hydraulic system (400); the positioning device includes a lateral positioning component (300) and a longitudinal positioning component (600).

2. The mass center of gravity detection and roll test system for a multi-axle special vehicle according to claim 1, characterized in that: The lateral positioning component (300) includes a first adjusting screw (310), both ends of which are screwed with a first universal rotating connector (320), and each of the first universal rotating connectors (320) is hinged with a first mounting bracket (330); one end of the lateral positioning component (300) is fixedly connected to the side wall of the tilting frame (100) through the first mounting bracket (330), and the other end of the lateral positioning component (300) is fixedly connected to the corresponding weighing frame (200) through the first mounting bracket (330); The longitudinal positioning component (600) includes a second adjusting screw (610), both ends of which are screwed with second universal rotating connectors (620), and each of the second universal rotating connectors (620) is hinged with a second mounting bracket (630); one end of the longitudinal positioning component (600) is fixedly connected to the bottom wall of the corresponding weighing frame (200) through the second mounting bracket (630), and the other end of the longitudinal positioning component (600) is fixedly connected to the top wall of the flipping frame (100) at the corresponding position of the weighing frame (200) through the second mounting bracket (630).

3. The mass center of gravity detection and roll test system for a multi-axle special vehicle according to claim 1, characterized in that: The weighing sensing unit is a weighing sensor assembly (240) mounted on the weighing frame (200).

4. The mass center of gravity detection and roll test system for a multi-axle special vehicle according to claim 3, characterized in that: The weighing frame (200) includes a steel frame (210), with a patterned steel plate (220) fixedly covering the upper end of the steel frame (210), and bearing plates (230) fixed at the four corners of the lower end of the steel frame (210). Each bearing plate (230) is fixedly connected to a weighing sensor assembly (240), and the bottom of the weighing sensor assembly (240) is fixedly connected to the tilting frame (100).

5. The mass center of gravity detection and roll test system for a multi-axle special vehicle according to claim 4, characterized in that: The weighing sensor assembly (240) includes a weighing sensor (241), one end of which is fixedly connected to the support plate (230) by an upper mounting bolt (242); the other end of the weighing sensor (241) is fixed with a support (243), which is located below the weighing sensor (241), and is fixedly connected to the tilting frame (100) by a lower mounting bolt (244).

6. The mass center of gravity detection and roll test system for a multi-axle special vehicle according to claim 1, characterized in that: The tilt sensing unit is an angle sensor assembly (170), which is fixed on the flip frame (100).

7. The mass center of gravity detection and roll test system for a multi-axle special vehicle according to claim 6, characterized in that: The tilting frame (100) includes a tilting frame body (110), an anti-tilt plate (120) is provided on one side of the tilting frame body (110), and one end of the lateral positioning component (300) is hinged to the side wall of the anti-tilt plate (120) through a first mounting bracket (330); hooks (130) are evenly distributed and fixed on the anti-tilt plate (120), and an mounting frame (140) is provided along the axial direction in the middle of the tilting frame body (110), and an anti-slip pull rod assembly (150) is installed on the mounting frame (140); a mounting plate (160) is fixed on one side of the bottom of the tilting frame body (110), and an angle sensor assembly (170) is fixed on the mounting plate (160); hinged frames (180) are also evenly distributed on the bottom of the tilting frame body (110) located on one side of the mounting plate (160).

8. The mass center of gravity detection and roll test system for a multi-axle special vehicle according to claim 7, characterized in that: The angle sensor assembly (170) includes an L-shaped mounting bracket (171), one side of which is fixed to the mounting plate (160), and the other side is fixed with an angle sensor (172). The rotating shaft of the angle sensor (172) is connected to a rod (173), and a counterweight (174) is fixedly connected to the end of the rod (173) away from the angle sensor (172).

9. A roll test system for detecting the center of gravity of a multi-axle special vehicle according to claim 7, characterized in that: The hydraulic system (400) includes an independent hydraulic station and a number of engineering cylinders (410) evenly distributed on one side of the bottom of the tilting frame (100). The independent hydraulic station is connected to each of the engineering cylinders (410) through hydraulic lines. One end of the engineering cylinder (410) is hinged to the bottom of the tilting frame (100), and the other end of the engineering cylinder (410) is hinged in the test pit. The engineering cylinder (410) is located on the side away from the hinged frame (180).

10. The mass center of gravity detection and roll test system for a multi-axle special vehicle according to claim 1, characterized in that: The detection and control system includes a data acquisition module and a control module; the data acquisition module is used to receive signals from the weighing sensor unit and the tilt sensor unit; the control module is used to control the hydraulic system (400) according to the signals.

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