Performance loading test device for actuating mechanism of carrier

Abstract

The invention discloses a vehicle actuating mechanism performance loading test device, and relates to the technical field of vehicle testing. The number of the driving screws is multiple, the driving screws are rotatably connected to the inner side of the testing frame, the multiple driving screws are arranged in parallel, and two sections of threads in opposite directions are symmetrically formed on the driving screws; the upper loading plate and the lower loading plate are respectively in threaded connection with the upper section thread and the lower section thread of the driving screw rod, and a loading test area is formed between the upper loading plate and the lower loading plate; the number of the driving mechanisms is the same as that of the driving screws, the driving mechanisms are all installed on the top face of the testing frame, and the multiple driving mechanisms correspondingly drive the multiple driving screws to rotate respectively. The testing device can be compatible with various types of actuating mechanisms, the application range of the testing device is expanded, the whole testing device is more compact in structure and small in occupied space, the displacement and load of the loading plate can be accurately controlled, and therefore the testing precision and reliability are improved, and the center of gravity is stable by adopting opposite top loading.

Description

Technical Field

[0001] The present invention relates to the field of vehicle testing technology, and more particularly to a vehicle actuation mechanism performance loading test device. Background Art

[0002] With the continuous development of modern transportation technology, vehicles (such as subways, light rails, electric vehicles, etc.) play an increasingly important role in urban transportation and logistics transportation. In order to improve the operating efficiency, safety and passenger comfort of vehicles, actuators (such as hydraulic actuators, electromechanical actuators and electro-hydraulic actuators) are widely used in various functional systems of vehicles, such as car height adjustment, suspension system, door control, etc. These actuators achieve dynamic adjustment and stable operation of vehicles through precise force and displacement control.

[0003] However, there are differences in the working principles and performance characteristics of different types of actuators. Hydraulic actuators use hydraulic oil as the power medium, and have the characteristics of high power density and fast response; electromechanical actuators rely on motor drive, and have the advantages of high precision and easy control; electro-hydraulic actuators combine the advantages of both, with high precision and high power density. In practical applications, different types of actuators may need to be selected to achieve specific functions according to the specific needs of the vehicle.

[0004] In order to ensure the reliability and performance stability of the actuator in actual working conditions, it is necessary to conduct comprehensive performance tests on it. At present, most of the existing test devices on the market focus on a single type of actuator (such as hydraulic actuators), lack versatility, and are not compatible with the loading tests of hydraulic actuators, electromechanical actuators, and electro-hydraulic actuators. This not only limits the scope of application of the test device, but also increases the test cost and time.

[0005] In addition, existing test devices are insufficient in simulating actual working conditions and cannot accurately reflect the dynamic performance and stability of the vehicle's actuator under complex working conditions. For example, during the docking, starting and operation of the vehicle, the actuator needs to cope with different load changes and working modes, and existing test devices often cannot provide such a diverse test environment.

[0006] Therefore, developing a performance loading test device that is highly versatile and compatible with various types of actuators is of great significance for improving the test efficiency of vehicle actuators, reducing test costs, and ensuring their reliability and stability in practical applications. Summary of the invention

[0007] In view of this, the present invention provides a vehicle actuation mechanism performance loading test device, aiming to solve the above-mentioned technical problems.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] A vehicle actuation mechanism performance loading test device, comprising:

[0010] Test rack;

[0011] A driving screw, wherein the number of the driving screws is multiple and all are rotatably connected to the inner side of the test frame, the multiple driving screws are arranged in parallel, and two sections of threads in opposite directions are symmetrically formed on the driving screws;

[0012] An upper loading plate and a lower loading plate, wherein the upper loading plate and the lower loading plate are respectively threadedly connected to the upper and lower thread sections of the driving screw, and a loading test area is formed between the upper loading plate and the lower loading plate;

[0013] The driving mechanisms are the same in number as the driving screws and are all mounted on the top surface of the test stand. The plurality of driving mechanisms respectively drive the plurality of driving screws to rotate.

[0014] Through the above technical solution, the present invention can be compatible with various types of actuating mechanisms (such as hydraulic actuators, electromechanical actuators and electro-hydraulic actuators), expand the scope of application of the test device, and reduce the need to replace the test equipment due to different types of actuating mechanisms. Through the design of multiple driving screws and loading plates, the loading test of the actuating mechanism can be realized in a limited space, making the structure of the entire testing device more compact and occupying less space. The upper and lower sections of the driving screw are respectively connected to the upper loading plate and the lower loading plate, which can accurately control the displacement and load of the loading plate, thereby improving the accuracy and reliability of the test, and the center of gravity is relatively stable when the top loading is adopted.

[0015] Preferably, in the above-mentioned carrier actuation mechanism performance loading test device, the test frame includes an upper support plate and a lower support plate arranged in parallel, a plurality of support rods are fixed between the upper support plate and the lower support plate, the plurality of support rods are arranged on the edges of the upper support plate and the lower support plate, and the plurality of drive screws are arranged on the inner sides of the plurality of support rods.

[0016] The parallel arrangement of the upper support plate and the lower support plate and the fixed connection of multiple support rods provide a stable support structure for the drive screw, ensuring the smooth movement of the loading plate during the test and avoiding the test results being affected by the unstable structure of the device. This layered support structure makes it easier to install and disassemble components such as the drive screw and loading plate, and facilitates the maintenance and overhaul of the test device, reducing maintenance costs and time. The setting of the support rods can effectively disperse and withstand the load force generated during the loading process, enhancing the overall load-bearing capacity of the test device and enabling it to adapt to the test of actuators with larger loads.

[0017] Preferably, in the above-mentioned carrier actuation mechanism performance loading test device, the top end of the driving screw is rotatably connected to the upper support plate, and the bottom end of the driving screw is rotatably connected to the lower support plate. The stable rotation connection can ensure the rotation accuracy of the driving screw, and then ensure the displacement accuracy of the upper loading plate and the lower loading plate, providing a guarantee for accurately testing the performance of the actuation mechanism.

[0018] Preferably, in the above-mentioned carrier actuator performance loading test device, the number of the drive screws is three, and they are arranged between the upper support plate and the lower support plate according to the vertex position of an equilateral triangle. The three drive screws are arranged in an equilateral triangle, so that the loading plate can bear the load more evenly when subjected to force, avoiding deformation or damage of the loading plate due to uneven force, thereby improving the reliability of the test device and the accuracy of the test results. The equilateral triangle is a stable geometric structure. This arrangement can enhance the overall structural stability of the test device, making it less likely to shake or deflect during the loading process, thereby ensuring the smooth progress of the test process. The arrangement of the three drive screws not only meets the test requirements, but also makes rational use of the space in the test frame, avoiding the structural complexity and space waste caused by too many drive screws.

[0019] Preferably, in the above-mentioned carrier actuation mechanism performance loading test device, the upper support plate, the lower support plate, the upper loading plate and the lower loading plate are all equilateral triangular plates, the support rod is connected to the vertex position of the upper support plate and the lower support plate, and the drive screw is connected to the vertex position of the upper loading plate and the lower loading plate. Each plate is an equilateral triangle, and the support rod and the drive screw are connected at the vertex position. This symmetrical design makes the structure of the entire test device more regular, and the relative position and force relationship between each component are clearer, which is convenient for structural analysis and optimization. The equilateral triangular plate has good structural stability and can effectively resist deformation under the action of external force, further enhancing the stability of the test device during the loading process, so that it can adapt to complex test conditions. This symmetrical and regular structural design simplifies the design and manufacturing process of the test device, reduces production costs, and also facilitates standardized production and batch manufacturing of the device.

[0020] Preferably, in the above-mentioned carrier actuation mechanism performance loading test device, the driving mechanism includes a driving motor, a reduction box and a gear set, the driving motor is installed on the top surface of the test frame, the reduction box is installed on the top surface of the test frame, and the power input port of the reduction box is connected to the power output port of the driving motor, and the gear set is connected between the top of the driving screw and the power output port of the reduction box. Through the cooperation of the reduction box and the gear set, the power of the driving motor can be smoothly and efficiently transmitted to the driving screw, ensuring the stable rotation of the driving screw, thereby realizing the precise displacement control of the loading plate. The reduction box and the gear set can adjust the transmission ratio as needed, thereby realizing the precise adjustment of the speed and displacement of the driving screw, improving the accuracy and flexibility of the test device, so that it can adapt to the testing requirements of different actuation mechanisms. The reduction box can increase the output torque, so that the driving mechanism can drive a larger load, enhance the load capacity of the test device, and expand its application range.

[0021] Preferably, in the above-mentioned carrier actuator performance loading test device, the gear set includes a helical gear plate and a driving helical gear, the helical gear plate is rotatably connected to the top surface of the test frame and is fixedly connected to the top end of the driving screw, and the driving helical gear is connected to the power output port of the reduction box and meshes with the helical gear plate. The helical gear transmission has high transmission efficiency and good meshing performance, which can reduce energy loss during power transmission, improve the efficiency of the entire drive system, and reduce energy consumption. The helical gear has good meshing stability, which can effectively reduce vibration and noise during transmission, making the test device more stable and quiet during operation, and providing a good environment for testing. The combined structure of the helical gear plate and the driving helical gear is compact, which can achieve effective power transmission in a limited space, saving the volume of the test device and making it more compact.

[0022] Preferably, in the above-mentioned carrier actuator performance loading test device, the drive motor is connected to an encoder, and the number of rotations of the drive motor detected by the encoder can calculate the linear displacement of the upper loading plate and the lower loading plate. The encoder can accurately measure the number of rotations of the drive motor, and combined with the transmission ratio and the pitch of the drive screw, the linear displacement of the loading plate can be accurately calculated, providing high-precision displacement data for the performance test of the actuator. The real-time monitoring function of the encoder can realize real-time monitoring of the displacement of the loading plate. Combined with the control system, the speed and direction of the drive motor can be adjusted in real time according to the test requirements, thereby realizing precise control of the loading process. Through the precise measurement and control of the encoder, the errors of manual measurement and adjustment can be reduced, the test efficiency can be improved, and the test cycle can be shortened.

[0023] Preferably, in the above-mentioned carrier actuator performance loading test device, a force sensor is installed on the upper loading plate and / or the lower loading plate. The force sensor can measure the load force borne by the loading plate in real time, provide accurate load data for the performance test of the actuator, and help evaluate the working performance of the actuator under different loads. Combined with the control system, the measurement data of the force sensor can be used as a feedback signal to adjust the output force of the drive mechanism in real time, achieve precise control of the loading force, and ensure the stability and reliability of the test process. Through real-time monitoring by the force sensor, an alarm can be issued in time or the operation of the test device can be stopped when the load exceeds the set value, thereby avoiding equipment damage or safety accidents caused by overload.

[0024] Preferably, in the above-mentioned carrier actuator performance loading test device, a cover is buckled on the top of the test frame, and the cover covers the drive mechanism. The cover can effectively prevent dust, impurities, etc. from entering the interior of the drive mechanism, reduce damage to the drive mechanism caused by external factors, extend the service life of the drive mechanism, and improve the reliability and stability of the test device. Covering the drive mechanism can prevent operators from contacting high-speed running parts during the test, avoid mechanical damage caused by misoperation, and improve the safety of the test device. The provision of the cover makes the overall appearance of the test device more neat and beautiful, and is convenient for use in environments such as laboratories or industrial sites.

[0025] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a vehicle actuation mechanism performance loading test device, which has the following beneficial effects:

[0026] 1. Strong versatility and wide application range: The device is compatible with various types of actuators (such as hydraulic actuators, electromechanical actuators and electro-hydraulic actuators), which solves the problem that existing test equipment can only test a single type of actuator, significantly expands the application range of the test device and reduces the test cost.

[0027] 2. Compact structure and high stability: The device adopts multiple driving screws, parallel support plates, equilateral triangle loading plates and support structures, so that the whole device can achieve efficient loading function in a limited space, and at the same time enhance the stability of the structure, reduce shaking and deformation during the test, and ensure the accuracy of the test results.

[0028] 3. High test accuracy: The symmetrical thread design of the drive screw, the combination of the drive motor and the encoder, and the installation of the force sensor achieve accurate measurement and control of the displacement and load of the loading plate. Through precise power transmission and real-time monitoring, it can meet the test requirements of different actuators under various working conditions, and improve the reliability and repeatability of the test.

[0029] 4. Efficient power transmission and strong load capacity: The driving mechanism adopts a combination of a driving motor, a reduction box and a gear set. Through helical gear transmission and an adjustable transmission ratio, it achieves efficient power transmission and a large load capacity, while ensuring smooth operation and low noise, and adapts to the test requirements under different load conditions.

[0030] 5. Safe, reliable and long service life: The design of the rotating connection reduces the wear between components and extends the service life of the equipment. The protective design of the cover effectively prevents the entry of dust and impurities, while protecting the safety of the operator, further improving the safety and reliability of the test device.

[0031] 6. Low operating cost and convenient maintenance: The overall structural design is simple, easy to install, maintain and overhaul. Through the optimized power transmission system and self-locking function, the energy consumption during operation is reduced, and the operating cost of the test device is reduced.

[0032] 7. Diversified simulated working conditions: Through adjustable load and displacement control, the device can simulate various complex working conditions of the actuator in actual applications (such as train entering, stopping, leaving the station, etc.), providing a comprehensive testing environment for evaluating the dynamic performance and stability of the actuator, which helps to discover potential problems in advance and optimize the design.

[0033] 8. Design optimization and easy expansion: The equilateral triangle structural design and symmetrical layout not only enhance stability, but also simplify the design and manufacturing process, making it easy to expand or customize according to test requirements, and has good scalability and adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0035] Figure 1 The accompanying drawing is a schematic structural diagram of a vehicle actuation mechanism performance loading test device according to Example 1 of the present invention;

[0036] Figure 2 The accompanying drawing is a front view of a vehicle actuation mechanism performance loading test device according to Embodiment 1 of the present invention;

[0037] Figure 3 The accompanying drawing is a top view of a vehicle actuation mechanism performance loading test device according to Embodiment 1 of the present invention;

[0038] Figure 4The accompanying drawing is a schematic structural diagram of the vehicle actuation mechanism performance loading test device of Example 1 provided by the present invention after the cover body is installed;

[0039] Figure 5 The accompanying drawing is a schematic structural diagram of a vehicle actuation mechanism performance loading test device according to Embodiment 2 of the present invention;

[0040] Figure 6 The accompanying drawings provide Figure 5 A magnified view of the part A in the middle;

[0041] Figure 7 The accompanying drawings provide Figure 5 A schematic diagram of the structure of opening the shielding sheet on the basis of the structure;

[0042] Figure 8 The accompanying drawings provide Figure 7 Enlarged view of part B in the middle.

[0043] in:

[0044] 1-test stand; 2-drive screw; 3-upper loading plate; 4-lower loading plate; 5-drive mechanism; 6-load test area; 7-upper support plate; 8-lower support plate; 9-support rod; 10-drive motor; 11-reduction gearbox; 12-gear set; 13-bevel gear plate; 14-drive bevel gear; 15-cover; 16-laser rangefinder; 17-through hole; 18-shielding sheet. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Embodiment 1:

[0047] See attached Figure 1 The embodiment of the present invention discloses a vehicle actuation mechanism performance loading test device, comprising:

[0048] Test stand 1;

[0049] A driving screw 2, wherein the number of the driving screws 2 is multiple and all are rotatably connected to the inner side of the test frame 1, the multiple driving screws 2 are arranged in parallel, and two sections of threads in opposite directions are symmetrically formed on the driving screws 2;

[0050] An upper loading plate 3 and a lower loading plate 4, wherein the upper loading plate 3 and the lower loading plate 4 are respectively threadedly connected to the upper and lower threads of the driving screw 2, and a loading test area 6 is formed between the upper loading plate 3 and the lower loading plate 4;

[0051] The driving mechanisms 5 , the number of which is the same as the number of the driving screw rods 2 , are all installed on the top surface of the test stand 1 , and the multiple driving mechanisms 5 respectively drive the multiple driving screw rods 2 to rotate.

[0052] See attached Figure 2 The test frame 1 includes an upper support plate 7 and a lower support plate 8 arranged in parallel, and a plurality of support rods 9 are fixed between the upper support plate 7 and the lower support plate 8. The plurality of support rods 9 are arranged at the edges of the upper support plate 7 and the lower support plate 8, and a plurality of drive screws 2 are arranged on the inner side of the plurality of support rods 9.

[0053] In order to further optimize the above technical solution, the top end of the driving screw rod 2 is rotatably connected to the upper support plate 7 , and the bottom end of the driving screw rod 2 is rotatably connected to the lower support plate 8 .

[0054] In this embodiment, the number of the driving screw rods 2 is three, and they are arranged between the upper support plate 7 and the lower support plate 8 according to the vertex positions of an equilateral triangle.

[0055] Specifically, the upper support plate 7, the lower support plate 8, the upper loading plate 3 and the lower loading plate 4 are all equilateral triangular plates, the support rod 9 is connected to the vertex positions of the upper support plate 7 and the lower support plate 8, and the drive screw 2 is connected to the vertex positions of the upper loading plate 3 and the lower loading plate 4.

[0056] See attached Figure 2 The driving mechanism 5 includes a driving motor 10, a reduction box 11 and a gear set 12. The driving motor 10 is installed on the top surface of the test frame 1, the reduction box 11 is installed on the top surface of the test frame 1, and the power input port of the reduction box 11 is connected to the power output port of the driving motor 10, and the gear set 12 is connected between the top end of the driving screw 2 and the power output port of the reduction box 11.

[0057] See attached Figure 3 The gear set 12 includes a bevel gear plate 13 and a driving bevel gear 14. The bevel gear plate 13 is rotatably connected to the top surface of the test frame 1 and is fixedly connected to the top end of the driving screw 2. The driving bevel gear 14 is connected to the power output port of the reduction box 11 and meshes with the bevel gear plate 13.

[0058] In order to further optimize the above technical solution, the drive motor 10 is connected to an encoder, and the number of rotations of the drive motor 10 detected by the encoder can calculate the linear displacement of the upper loading plate 3 and the lower loading plate 4.

[0059] In this embodiment, the drive motor 10 is a permanent magnet synchronous motor, and the number of rotations of the drive motor 10 can be monitored by an encoder. An encoder is a device that converts the rotation of a motor shaft into a digital signal, and can accurately measure the speed and angle of rotation of the motor. In practical applications, the encoder is usually installed on the shaft of the motor, and the number of rotations of the motor can be obtained by reading the output signal of the encoder.

[0060] To calculate the displacement of the upper loading plate 3 and the lower loading plate 4 by the number of revolutions of the driving motor 10 , it is necessary to know the transmission ratio between the driving motor 10 and the driving screw 2 and the pitch of the driving screw 2 .

[0061] The transmission ratio refers to the number of revolutions of the drive screw 2 when the drive motor 10 rotates one revolution. If the drive motor 10 directly drives the drive screw 2, the transmission ratio is 1:1. In this embodiment, there are a reduction box 11 and a gear set 12, and the transmission ratio will change accordingly.

[0062] Determine the pitch of the drive screw 2: The pitch of the drive screw 2 refers to the distance between two adjacent threads on the drive screw 2. This parameter is usually given in the specifications of the screw.

[0063] In this embodiment, it is assumed that the selected transmission ratio is 2:1, that is, the driving motor 10 rotates 2 turns and the driving screw 2 rotates 1 turn.

[0064] Assuming that the pitch of the driving screw 2 is P and the driving motor 10 rotates N times, then at a transmission ratio of 2:1, the actual number of times the driving screw 2 rotates is N / 2. Therefore, the displacement S of the upper loading plate 3 and the lower loading plate 4 can be expressed as: S = N / 2 × P.

[0065] For example, if the pitch P of the driving screw 2 is 1 mm and the driving motor 10 rotates 10 times, then at a transmission ratio of 2:1, the displacement S of the upper loading plate 3 and the lower loading plate 4 is: S=10 / 2×1=5 mm.

[0066] The above calculation example does not take into account the transmission of the reduction box 11 and the gear set 12. In actual calculation, the transmission ratio can be determined according to the actual situation.

[0067] In order to further optimize the above technical solution, a force sensor is installed on the upper loading plate 3 and / or the lower loading plate 4.

[0068] See attached Figure 4 A cover 15 is buckled on the top of the test stand 1 , and the cover 15 covers the driving mechanism 5 .

[0069] The device provided in this embodiment has the advantages that:

[0070] 1. No energy is consumed when stationary, and a smaller thread pitch is used to make the device self-locking.

[0071] 2. The loading process does not utilize the deadweight of the device, so the weight and volume of the entire device can be made relatively light.

[0072] 3. The center of gravity of the device is relatively stable. For devices that rely on their own weight for loading, there may be a risk of insufficient strength at the connection position. However, this device adopts top loading to avoid this problem.

[0073] In this embodiment, taking the height adjustment system of a subway car as an example, the car height adjustment system realizes automatic adjustment of the car height through a series of sensors, controllers, hydraulic power units and actuators working together; when the height of the car needs to be lowered, the controller starts the hydraulic power unit, and the motor drives the hydraulic pump to generate high-pressure oil, which enters the lower chamber of the actuator through the hydraulic valve, pushing the actuator to contract, thereby compressing the spring and lowering the car to the same level as the platform; after reaching the set height, the system enters the locking mode to maintain the oil pressure and keep the position of the car unchanged. After the passengers get on and off the car, the controller switches to the release mode, at which time the actuator begins to extend under the action of the spring force, and the car rises accordingly; the system controls the oil return speed through the two-way speed limiting valve to ensure that the car smoothly returns to its original height.

[0074] The total weight of the carriage is about 16 tons, the number of actuators is 4, the actuator spring stiffness is 600N / mm, the maximum pressure of the lower chamber of the hydraulic cylinder when working with load is about 13.6MPa, and the maximum pressure of the lower chamber of the hydraulic cylinder when working without load is about 14.8MPa. Figures 1 to 3 As shown, the basic parameters of the test device include: the distance between the upper support plate 7 and the lower support plate 8: 1000mm, the maximum stroke 600mm, and the maximum load that can be applied 8t.

[0075] The following provides the specific working process:

[0076] Working condition 1: The test device is in contact with the carriage height adjustment system actuator, loaded to 6t, and the load is kept unchanged, so that the carriage height adjustment system actuator is pressed down and enters the working state. At this time, the internal device of the carriage height adjustment system actuator does not work, and the elastic force generated by the compression of the carriage height adjustment system actuator itself is balanced with the external load of 6t. This process is used to simulate the train before entering the station. At this time, there is only the weight of the carriage and a fixed number of passengers. The carriage height adjustment system actuator stops working, and the weight of the train is balanced with the spring elastic force.

[0077] Working condition 2: The internal device of the carriage height adjustment system actuator starts to work, generating internal force, which reduces the length of the carriage height adjustment system actuator. The test device is required to always be in contact with the carriage height adjustment system actuator and the load is constant, which is 6 tons. This process is used to simulate the train entering the station. At this time, there is only the weight of the carriage and a fixed number of passengers. The carriage height adjustment system actuator starts to work and pulls the train height to the same height as the platform. The whole process is completed in about 15 seconds.

[0078] Working condition three: When the carriage height adjustment system actuator reaches the rated working length and remains unchanged under the traction of the internal device, the test device begins to generate a changing load, which is intended to test the stability of the internal device of the carriage height adjustment system actuator at the rated working position through the changing load, for example, it can change back and forth regularly between 4t and 8t. This process is used to simulate a train stop. At this time, in addition to the weight of the carriage, there is also a change in the number of passengers. The carriage height adjustment system actuator starts to work to keep the train height unchanged and always consistent with the platform height.

[0079] Working condition 4: The test ends and returns to working condition 1. This process is used to simulate the train leaving the station. At this time, there is the weight of the carriage and a stable number of passengers. The actuator of the carriage height adjustment system stops working, the weight of the train is balanced with the spring force, and the train runs stably.

[0080] Embodiment 2:

[0081] See attached Figure 5 To Attachment Figure 8 This embodiment is further improved on the basis of the embodiment 1, mainly to realize the monitoring of the driving stability of the test device. Specifically, it also includes:

[0082] Laser rangefinder 16, the laser rangefinder 16 is installed on the top surface of the test frame 1, that is, the top surface of the upper support plate 7. Similarly, there are three laser rangefinders 16. The upper loading plate 3 and the lower loading plate 4 are provided with through holes 17 corresponding to the emission and recovery paths of the laser rangefinder 16. A shielding piece 18 is rotatably connected to the through hole 17. In order to detect the opening and closing of the shielding piece 18, a signal sensing switch is also provided at the connection position of the shielding piece 18.

[0083] In this embodiment, both the upper loading plate 3 and the lower loading plate 4 have a through hole 17 , and the through hole 17 is located at the midpoint of the edge of the plate body.

[0084] Before using the device, you can first open all the shielding sheets 18, perform laser distance measurement, and detect whether the upper support plate 7 and the lower support plate 8 are deformed. Then, close the shielding sheet 18 on the lower loading plate 4, detect whether the distances of each point on the lower loading plate 4 are equal, and determine whether the lower loading plate 4 is deformed or the position is offset due to the asynchronous rotation of the drive screw 2. Finally, close the shielding sheet 18 on the upper loading plate 3, detect whether the distances of each point on the upper loading plate 3 are equal, and determine whether the upper loading plate 3 is deformed or the position is offset due to the asynchronous rotation of the drive screw 2. After all the detections are completed, you can perform the test.

[0085] The two corresponding upper and lower shielding sheets 18 are regarded as a group. During the test, one group of shielding sheets 18 is fully opened, and the remaining two groups of shielding sheets 18 are opened to different positions respectively. During the test, the distance between the upper support plate 7 and the lower support plate 8, the distance between the upper support plate 7 and the lower loading plate 4, and the distance between the upper support plate 7 and the upper loading plate 3 are monitored in real time to meet the deformation or offset monitoring of each structure.

[0086] Specific:

[0087] For monitoring the distance between the upper support plate 7 and the lower support plate 8, it is only necessary to ensure that the distance remains unchanged.

[0088] The monitoring of the spacing between the upper support plate 7 and the lower loading plate 4 and the spacing between the upper support plate 7 and the upper loading plate 3 needs to be matched with the displacement calculation in Example 1, that is, whether the moving distance calculated by the encoder is equal to the distance measured by the laser rangefinder 16, so as to make a judgment.

[0089] Different shielding sheets 18 may be opened according to actual needs. If the upper loading plate 3 is prone to deformation, all shielding sheets 18 on the upper loading plate 3 are closed, and only the upper loading plate 3 is monitored. Since a signal sensing switch is provided, the monitored object can be fed back accordingly.

[0090] In this embodiment, the amount of elastic deformation in the mechanical transmission can be determined through experiments and compensated in the calculation.

[0091] step:

[0092] Under different loads, the actual displacement and calculated displacement are measured respectively, and the error is recorded.

[0093] Analyze the relationship between error and load, and establish a compensation model (such as linear compensation or nonlinear compensation).

[0094] A compensation algorithm is added to the control system to adjust the calculated displacement according to the actual load.

[0095] Assume that in a certain test, the calculated displacement is 5mm, while the actual displacement measured by the laser rangefinder 16 is 5.05mm, with an error of 0.05mm. The adjustment steps are as follows:

[0096] Calibrate the gear ratio:

[0097] The actual measured transmission ratio is 1.95:1 (the theoretical value is 2:1), and the transmission ratio parameters in the control system are updated.

[0098] Recalculate the displacement:

[0099] The calculated displacement after updating is: S = 10 / 1.95 × 1 ≈ 5.13 mm.

[0100] Compensation for mechanical deformations:

[0101] It was found experimentally that mechanical deformation under this load resulted in an increase in displacement of 0.08 mm.

[0102] Add a compensation value of -0.08mm to the control system.

[0103] Final adjustment result:

[0104] The calculated displacement after adjustment is: 5.13-0.08=5.05mm, which is consistent with the actual measured value.

[0105] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0106] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vehicle actuation mechanism performance loading test device, characterized in that: include: Test stand (1); A driving screw rod (2), wherein the number of the driving screw rods (2) is plural and all are rotatably connected to the inner side of the test frame (1), the plurality of driving screw rods (2) are arranged in parallel, and the driving screw rods (2) are symmetrically formed with two sections of threads in opposite directions; An upper loading plate (3) and a lower loading plate (4), wherein the upper loading plate (3) and the lower loading plate (4) are respectively threadedly connected to the upper and lower threads of the driving screw (2), and a loading test area (6) is formed between the upper loading plate (3) and the lower loading plate (4); Driving mechanisms (5), the number of the driving mechanisms (5) is the same as the number of the driving screw rods (2), and all are installed on the top surface of the test frame (1), and the plurality of driving mechanisms (5) respectively drive the plurality of driving screw rods (2) to rotate.

2. A vehicle actuation mechanism performance loading test device according to claim 1, characterized in that: The test stand (1) comprises an upper support plate (7) and a lower support plate (8) arranged in parallel, a plurality of support rods (9) are fixed between the upper support plate (7) and the lower support plate (8), the plurality of support rods (9) are arranged at the edges of the upper support plate (7) and the lower support plate (8), and the plurality of drive screws (2) are arranged on the inner sides of the plurality of support rods (9).

3. A vehicle actuation mechanism performance loading test device according to claim 2, characterized in that: The top end of the driving screw rod (2) is rotatably connected to the upper support plate (7), and the bottom end of the driving screw rod (2) is rotatably connected to the lower support plate (8).

4. A vehicle actuation mechanism performance loading test device according to claim 3, characterized in that: The number of the driving screw rods (2) is three, and they are arranged between the upper support plate (7) and the lower support plate (8) according to the vertex positions of an equilateral triangle.

5. A vehicle actuation mechanism performance loading test device according to claim 4, characterized in that: The upper support plate (7), the lower support plate (8), the upper loading plate (3) and the lower loading plate (4) are all equilateral triangular plates, the support rod (9) is connected to the vertices of the upper support plate (7) and the lower support plate (8), and the drive screw (2) is connected to the vertices of the upper loading plate (3) and the lower loading plate (4).

6. A vehicle actuation mechanism performance loading test device according to claim 1, characterized in that: The driving mechanism (5) comprises a driving motor (10), a reduction box (11) and a gear set (12); the driving motor (10) is mounted on the top surface of the test frame (1); the reduction box (11) is mounted on the top surface of the test frame (1), and the power input port of the reduction box (11) is connected to the power output port of the driving motor (10); and the gear set (12) is connected between the top end of the driving screw (2) and the power output port of the reduction box (11).

7. A vehicle actuation mechanism performance loading test device according to claim 6, characterized in that: The gear set (12) comprises a bevel gear plate (13) and a driving bevel gear (14); the bevel gear plate (13) is rotatably connected to the top surface of the test frame (1) and is fixedly connected to the top end of the driving screw rod (2); the driving bevel gear (14) is connected to the power output port of the reduction box (11) and is meshed with the bevel gear plate (13).

8. The vehicle actuation mechanism performance loading test device according to claim 6, characterized in that: The drive motor (10) is connected to an encoder, and the number of rotations of the drive motor (10) detected by the encoder can be used to calculate the linear displacements of the upper loading plate (3) and the lower loading plate (4).

9. A vehicle actuation mechanism performance loading test device according to claim 1, characterized in that: A force sensor is installed on the upper loading plate (3) and / or the lower loading plate (4).

10. The vehicle actuation mechanism performance loading test device according to claim 1, characterized in that: A cover body (15) is buckled on the top of the test stand (1), and the cover body (15) covers the driving mechanism (5).

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