Energy-saving device for suspension experiment

Abstract

The invention relates to the technical field of automobile manufacturing and detection, in particular to an energy-saving device for a suspension experiment, which comprises a rack, the top end of the rack is connected with a loading unit, the loading unit comprises an actuator, the top end of a piston rod of the actuator is connected with a loading beam, the bottom end of the piston rod is connected with a clamp, and the clamp is connected with the loading beam. The loading beam is connected with the top end of the air spring assembly, the bottom end of the air spring assembly is connected with the rack, downward pressure of the actuator is transmitted to the air spring assembly through the loading beam, and the air spring assembly generates upward gas pressure and elastic deformation force under the pressure action of the loading beam so as to reduce loads needing to be borne by the actuator. The invention provides an energy-saving device for a suspension experiment, which can effectively balance the downward pulling force of a loading unit, obviously reduce the operation energy consumption and greatly improve the energy-saving effect. The device is simple in structure and wide in application range, and can be widely applied to suspension performance tests of various vehicles.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile manufacturing detection, and in particular to an energy-saving device for suspension experiment. BACKGROUND

[0002] With the popularity of passenger cars, people's requirements for vehicle safety and comfort are increasing, and related performance needs to rely on a large amount of test data support. The suspension system as a key assembly, its parts must be subjected to durability fatigue life test before being installed on the vehicle, and dynamic loading is often required in the simulated real vehicle state. At present, such test mainly uses hydraulic servo loading device to apply alternating load through actuator under the control of servo valve. However, the traditional device has a significant energy consumption problem: the servo valve throttling loss is large, the energy generated by the reciprocating motion of the actuator is not recycled, and the hydraulic pump runs continuously under high load, resulting in high power consumption, especially in long-term durability test, energy consumption has become an important burden for test units. At the same time, with the improvement of energy saving and emission reduction requirements, the existing test equipment is insufficient in energy efficiency and environmental protection. Therefore, it is urgent to develop an energy-saving device for suspension experiment, which can effectively reduce the operating energy consumption and improve the energy utilization efficiency to meet the needs of efficient testing and green development of automobile parts. SUMMARY

[0003] In view of the above-mentioned deficiencies of the existing suspension experiment device, the present application provides an energy-saving device for suspension experiment, which can effectively balance the downward pulling force of the loading unit, significantly reduce the energy consumption of the suspension experiment device during operation, and greatly improve the energy-saving effect. The device has a simple structure and a wide range of applications, and can be widely used in suspension performance testing of various vehicles.

[0004] To achieve the above-mentioned purpose, the embodiments of the present application adopt the following technical solutions: An energy-saving device for suspension experiment, comprising a rack, a loading unit connected to the top end of the rack, the loading unit comprising an actuator, the piston rod of the actuator being connected to the top end of a loading beam, the bottom end of the piston rod being connected to a clamp, the loading beam being connected to the top end of an air spring assembly, the bottom end of the air spring assembly being connected to the rack, the downward pressure of the actuator being transmitted to the air spring assembly through the loading beam, and the air spring assembly generating upward gas pressure and elastic deformation force under the pressure of the loading beam to reduce the load required to be borne by the actuator.

[0005] According to one aspect of the present application, a tension and compression load sensor is further included, which is arranged at the lower end of the air spring assembly to monitor the dynamic load borne by the air spring assembly.

[0006] According to an aspect of the present application, the air spring assembly comprises at least one air spring, the air springs are connected in series through air spring connecting flanges, the top air spring is connected with the loading beam, and the bottom air spring is connected with the tension-compression load sensor.

[0007] According to an aspect of the present application, the rack is provided with a mounting seat assembly, the mounting seat assembly comprises a bottom mounting plate, an upper fixing plate and a sensor mounting plate, the bottom mounting plate is fixedly mounted on the rack, the upper fixing plate is connected with the bottom mounting plate through a support column, the sensor mounting plate is connected with the bottom mounting plate through a small support column, and the tension-compression load sensor is mounted on the sensor mounting plate.

[0008] According to an aspect of the present application, the rack is provided with a mounting seat assembly, the mounting seat assembly comprises a bottom mounting plate, an upper fixing plate and a sensor mounting plate, the bottom mounting plate is fixedly mounted on the rack, the upper fixing plate is connected with the bottom mounting plate through a support column, the sensor mounting plate is connected with the bottom mounting plate through a small support column, and the tension-compression load sensor is mounted on the sensor mounting plate.

[0009] According to an aspect of the present application, the air spring assembly is provided as two, and the two air spring assemblies are symmetrically arranged on both sides of the loading unit.

[0010] According to an aspect of the present application, the air spring assembly is connected with a pneumatic system, the pneumatic system is configured to supply gas to the air spring assembly and adjust the internal gas pressure of the air spring assembly.

[0011] According to an aspect of the present application, the rack is provided with a mounting seat assembly, the mounting seat assembly comprises a bottom mounting plate, an upper fixing plate and a sensor mounting plate, the bottom mounting plate is fixedly mounted on the rack, the upper fixing plate is connected with the bottom mounting plate through a support column, the sensor mounting plate is connected with the bottom mounting plate through a small support column, and the tension-compression load sensor is mounted on the sensor mounting plate.

[0012] According to an aspect of the present application, the pneumatic system comprises a gas source treatment system, a proportional pressure reducing valve and a gas storage tank, the input end of the proportional pressure reducing valve is connected with the gas source treatment system, the output end of the proportional pressure reducing valve is connected with the gas storage tank, and the gas storage tank is connected with the air spring assembly.

[0013] According to an aspect of the present application, the loading unit further comprises a displacement sensor and a load sensor, one end of the actuator is connected with the displacement sensor, the other end is connected with the load sensor, the displacement sensor is mounted on the top of the rack, and the load sensor is connected with the clamp.

[0014] The advantages of the embodiment of the present application are as follows: by arranging the energy-saving device, an upward force can be applied to the loading beam, and the force is transmitted to the upper end of the piston rod of the actuator. The force can balance the downward force of the piston rod, and the balance of the initial static dynamic force (the gravity of the vehicle body) is realized. By arranging the air spring, gas can be filled into the air spring, so that the air spring generates gas pressure and elastic deformation force. By changing the gas pressure in the air spring, the requirement of different tests for different forces can be met, so that the applicability of the equipment is improved. The static load of the air spring changes relatively stably, and the air spring can quickly respond to the dynamic load, so that the quick conversion of energy storage and energy release is realized. The two air springs are connected in series in an up-down mode, so that the deformation amount of a single air spring in the experiment process is reduced, the load change range is smaller, and the service life of the air spring is prolonged. Two energy-saving devices are arranged on both sides of the loading unit, so that the force borne by the piston rod can be balanced, the piston rod is prevented from being affected by the bending moment force, and the service life of the actuator is improved. By arranging the pneumatic system and the control system, the air pressure in the air spring can be regulated and controlled, so that the requirement of different tests for different forces is met. The control system is responsible for the accurate coordination and closed-loop management of the whole test process. The control system collects the signals of force, displacement and other sensors in real time, adjusts the output of the servo valve, controls the actuator to perform dynamic loading according to the set load spectrum, so that the accurate control of test parameters, data monitoring and automatic operation are realized. The energy-saving device for suspension experiment provided by the present application can effectively balance the downward pulling force of the actuator, uniformly distribute the load through the ingenious force transmission mechanism, significantly reduce the energy consumption of the suspension experiment device during operation, and greatly improve the energy-saving effect. The device has a simple structure and a wide range of applications, and can be widely applied to the suspension performance test of various vehicles, has a good application prospect, and has remarkable economic benefits and social benefits. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 FIG. 1 is a perspective structural schematic view of the energy-saving device for suspension experiment according to the present application; Figure 2 FIG. 2 is a perspective structural schematic view of the suspension experiment device using the energy-saving device according to the present application; Figure 3 FIG. 3 is a cross-sectional schematic view of the energy-saving device for suspension experiment according to the present application; Figure 4 FIG. 4 is a diagram of the test force of the actuator according to the present application; Figure 5 A schematic diagram of the air spring structure of the energy-saving device for suspension experiment according to the present application; Figure 6 Dynamic characteristics of the air spring according to the present application; Figure 7 Static characteristics of the air spring according to the present application; Figure 8 Mechanical characteristics of the coil spring; Figure 9 A schematic diagram of the pneumatic system.

[0017] Reference numerals in the drawings: 1, rack; 11, upright column; 12, cross beam; 13, upper mounting plate; 14, guardrail; 15, base; 2, loading unit; 21, actuator; 25, load sensor; 28, loading device; 30, displacement sensor; 3, counterforce frame; 4, clamp; 5, energy-saving device; 51, mounting seat assembly; 511, bottom mounting plate; 512, support column; 513, upper fixing plate; 514, small support column; 515, sensor mounting plate; 53, air spring assembly; 531, lower air spring plate; 532, first air spring; 533, air spring connecting flange; 534, second air spring; 54, tension and compression load sensor; 55, guiding device; 551, guiding rod; 552, guiding beam; 553, bearing sleeve; 554, bearing baffle; 555, upper plate flange; 6, loading beam; 01, gas source processing system; 02, proportional pressure reducing valve; 03, gas storage tank; 04, pressure gauge. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0019] Embodiment one

[0020] As Figures 1 to 9As shown, an energy-saving device for suspension experiment is used in a vehicle suspension experiment device, and the suspension device comprises a rack 1, a loading unit 2, a counterforce frame 3, a loading beam 6, a clamp, and an energy-saving device 5. The rack 1 is used for mounting various parts on the machine body, and comprises a base 15, a stand column 11, a cross beam 12, an upper mounting plate 13, and a guardrail 14. The stand column 11 is fixed symmetrically at two ends of the base 15, and the cross beam is fixed at the middle or top end of the two stand columns 11. The guardrail 14 is fixedly mounted on the cross beam 12, and the top of the guardrail 14 is provided with the upper mounting plate 13. The counterforce frame 3 is mounted on the base 15 of the rack 1 and is arranged between the two stand columns 11. The loading unit 2 is connected to the top end of the rack 1, and is arranged between the two stand columns 11. Specifically, the top end of the loading unit 2 is connected to the upper mounting plate 13 of the rack 1, and the bottom end of the loading unit 2 is connected to the clamp 4. The clamp 4 is mounted on the counterforce frame 3. The energy-saving device comprises an air spring assembly 53, which is arranged on the rack 1, specifically on the cross beam 12 of the rack 1. The top of the air spring assembly 53 is provided with the loading beam 6, which is mounted on the upper end of the loading unit 2. When the loading unit 2 applies a load, the load is applied to the loading beam 6. After the test piece (suspension) is installed on the clamp 4, the clamp 4 is driven by the loading unit 2 to ascend or descend relative to the counterforce frame 3, so as to vertically load the test piece (suspension). The energy-saving device 5 forms an upward force under the pressure of the loading beam 6 and applies the force to the loading unit 2, so as to reduce the load required to be borne by the loading unit 2.

[0021] In the embodiment, the loading unit comprises an actuator 21, a displacement sensor 30, and a load sensor 25. One end of the actuator 21 is connected to the displacement sensor 30, and the other end is connected to the load sensor 25. The displacement sensor 30 is mounted on the top of the rack 1, specifically on the upper mounting plate 13 of the rack 1. The lower end of the displacement sensor 30 is connected to the telescopic rod of the actuator 21. The load sensor 25 is connected to the clamp 4 through a loading device 28.

[0022] In the embodiment, the loading beam 6 is mounted on the top end of the piston rod of the actuator 21. Under the action of hydraulic oil, the extension or retraction of the piston rod will apply a dynamic load to the loading beam 6.

[0023] In the embodiment, the energy-saving device 5 further comprises an energy-saving device mounting seat assembly 51, which comprises a bottom mounting plate 511, a support 512, an upper fixing plate 513, a small support 514, and a sensor mounting plate 515. The upper fixing plate 513 is fixedly mounted on the bottom mounting plate 511 through the support 512, and the sensor mounting plate 515 is mounted on the bottom mounting plate 511 through the small support 514. The air spring assembly 53 is mounted on the energy-saving device mounting seat assembly 51, and the top of the air spring assembly 53 is connected with the loading beam 6. Under the pressure of the loading beam 6, the air spring assembly 53 generates upward gas pressure and elastic deformation force.

[0024] In the embodiment, the air spring assembly 53 is provided in two, and the two air spring assemblies 53 are symmetrically arranged on the two sides of the loading unit 2. Such arrangement is to balance the stress of the piston rod and avoid the influence of the bending moment force on the piston rod. In other embodiments, the number of the energy-saving device 5 is not limited, and can be one, three, four, etc. The static initial force of the force balancing loading unit is used as a reference (the weight of the vehicle body).

[0025] In the embodiment, the energy-saving device 5 further comprises a tension and compression load sensor 54, which is arranged at the lower end of the air spring assembly 53 and is used to monitor the dynamic load borne by the air spring assembly 53.

[0026] In the embodiment, the air spring assembly 53 comprises a first air spring 532 and a second air spring 534, and the first air spring 532 and the second air spring 534 are connected through an air spring connecting flange 533. The first air spring 532 is connected with the loading beam 6 through a lower air spring plate 531, and the second air spring 534 is connected with the tension and compression load sensor 54 through the lower air spring plate 531. The tension and compression load sensor 54 is mounted on the sensor mounting plate 515. The two air springs are connected in series in order to reduce the deformation of each air spring during the test, so that the load change range is smaller, and the service life of the air spring is longer. In other embodiments, the number of air springs is not limited, and a person skilled in the art can set it according to the needs, which can be one air spring or multiple air springs, i.e., at least one air spring. The air springs are connected in series through the air spring connecting flange 533, the top air spring is connected with the loading beam 6 through the lower air spring plate 531, and the bottom air spring is connected with the tension and compression load sensor 54 through the lower air spring plate 531.

[0027] In the embodiment, the energy-saving device 5 further comprises a guiding device 55 configured to guide the movement of the air spring assembly 53 to smoothly slide along the guiding device 55 and prevent the air spring assembly 53 from deviating or tilting. The guiding device 55 comprises a guiding beam 552 connected with the air spring assembly 53, specifically, the guiding beam 552 is fixedly installed on the air spring connecting flange 533, the guiding beam 552 is sleeved on the guiding rod 551 and can slide up and down along the guiding rod 551. The guiding rod 551 and the guiding beam 552 are provided with a bearing sleeve 553 fixedly installed on the guiding beam 552 through a bearing baffle 554, the top end of the guiding rod 551 is fixedly connected with the upper mounting plate 13 through an upper plate flange 555, and the bottom end is fixedly connected with the upper fixed plate 513. The guiding rod 551 is provided with two rods which are symmetrically arranged on both sides of the air spring assembly. By arranging the guiding device, the deviation or tilting of the air spring assembly can be effectively prevented, so that the bending moment force load of the piston rod can be avoided.

[0028] In the embodiment, the upper mounting plate 13 and the upper fixed plate 513 are fixedly connected with a fixed column, and the loading beam 6 is sleeved on the fixed column and can slide up and down. In other embodiments, the fixed column can be fixed on the upper mounting plate 13, the cross beam 12 or the base 15, which is mainly used to guide the loading beam and limit the movement of the loading beam, so that the loading capacity can slide parallelly relative to the bottom surface.

[0029] Through the test of the energy-saving device for suspension experiment, under the support of the energy-saving device 5, the actuator is changed from 65kN to 35kN, the hydraulic station is changed from 400L to 200L, the power of the energy-saving device for suspension experiment is changed from 185kW to 100kW, and the test power is greatly reduced. According to the test results, the average energy-saving can reach 34.5%, the economic benefit is significant, and it is suitable for wide promotion and use.

[0030] The beneficial effect of the embodiment is that, by the arrangement of the energy-saving device, an upward force can be applied to the loading beam and transmitted to the upper end of the piston rod of the actuator. This force can balance the downward force of the piston rod, thereby achieving the balance of the initial static dynamic force (the weight of the vehicle body). By the arrangement of the air spring, gas can be filled into the air spring to generate gas pressure and elastic deformation force. Moreover, by changing the gas pressure in the air spring, the requirement for different sizes of force in different tests can be met, thereby improving the applicability of the equipment. The static load of the air spring changes relatively stably, and the air spring can quickly respond to the dynamic load, so that the energy storage-energy release can be quickly converted. The two air springs are connected in series in an up-down manner, so that the deformation amount of a single air spring during the experiment is reduced, the load change range is smaller, and the service life of the air spring is prolonged. The two energy-saving devices arranged on both sides of the loading unit can balance the force acting on the piston rod and avoid the influence of the bending moment force on the piston rod, thereby improving the service life of the actuator. The displacement sensor is arranged at the top end of the piston rod of the actuator, and the load sensor is arranged at the bottom end of the piston rod. The displacement sensor is used to measure the displacement change of the piston rod in real time and accurately, so as to obtain the dynamic stroke, vibration amplitude and motion trajectory of the suspension system, thereby providing key data for analyzing the kinematic characteristics of the suspension, evaluating the response accuracy of the control algorithm and verifying the simulation model. The load sensor is used to monitor the acting force or the counterforce borne by the actuator in real time, so as to reflect the stress state and dynamic load characteristics of the suspension under different road excitation. The displacement sensor and the load sensor work together to comprehensively collect the displacement-force dynamic response data of the suspension system, so as to realize the closed-loop monitoring and accurate control of the output performance of the actuator.

[0031] Embodiment two

[0032] The difference between the embodiment and the embodiment one is that, in the embodiment, the air spring assembly 53 is connected with a pneumatic system, and the pneumatic system is configured to supply gas to the air spring assembly 53 and adjust the gas pressure inside the air spring assembly 53. As shown in Figure 9 the pneumatic system includes a gas source treatment system 01, a proportional pressure reducing valve 02, a gas storage tank 03, a gas circuit and a pressure gauge 04. The input end of the proportional pressure reducing valve 02 is connected with the gas source treatment system 01 through the gas circuit, the output end of the proportional pressure reducing valve 02 is connected with the gas storage tank 03 through the gas circuit, the gas storage tank 03 is connected with the air spring assembly 53 through the gas circuit, and the pressure gauge 04 is arranged between the gas storage tank 03 and the air spring assembly 53. The gas source treatment system adopts a three-in-one device, that is, the gas source treatment system includes a filter, a pressure reducing valve and an (optional) oil atomizer.

[0033] In the embodiment, a control system is further included, which is connected with the loading unit 2, the tension and compression load sensor 54 and the pneumatic system respectively. The control system can realize remote control and adjustment, and change the inflation pressure to meet the requirements of different experiments for different sizes of force. The size of the inflation pressure is measured by a pressure gauge and / or a tension and compression load sensor.

[0034] The working principle or operation process in the embodiment is as follows: as shown in the figure, the force output by the actuator has two purposes, one is to balance the initial static force Fl (simulating the gravity of the vehicle body) on the suspension, and the other is to apply a dynamic test force F2 (simulating the jolt force under different road conditions), that is, F = Fl + F2 (F: total output force of the actuator; Fl: initial static force; F2: dynamic test force), the experimental force F is always a unidirectional force (the loading unit 2 is always subjected to tension), the initial static force Fl is always unchanged during the experiment, that is, the energy-saving device 5 is used to balance the initial static force Fl, and then the output force of the actuator is only used to meet the test requirements of the dynamic test force F2, so a smaller load actuator can be used to achieve the purpose of energy saving. Figure 4

[0035] Before the experiment, the air spring assembly 53 is inflated according to the size of Fl in the test force, and the inflation pressure and elastic deformation force of the air spring assembly 53 are measured by a pressure gauge and / or a tension and compression load sensor. The inflation pressure and elastic deformation force of the air spring assembly 53 are applied to the upper end of the piston rod of the actuator through the loading beam 6, forming an upward force, which is equal and opposite to the force (downward force) applied by the suspension to the lower piston rod of the actuator 21, so as to achieve the purpose of balance.

[0036] The two air springs in the energy-saving device are air springs, that is, they rely on the characteristics of smaller gas volume and larger pressure to generate elastic springs, which are used as elastic elements in the device for loading and energy storage. Specifically, the air spring relies on gas for work, and this characteristic facilitates remote adjustment of the size of the initial static force Fl (by adjusting the air pressure) according to different test requirements in use, making the operation more convenient. As shown in the figure, Figure 6 、 Figure 7 and Figure 8 , the pressure characteristics of the air spring are much superior to those of the coil spring. As can be seen from the figure, the mechanical characteristics of the coil spring are relatively single, while the air spring has different responses to static load and dynamic load. The static load has no obvious response in a long deformation range, which meets the requirement that the balance force remains unchanged during the test, while the dynamic stiffness increases, which can quickly respond to the dynamic load and quickly complete the energy storage-energy release change process.

[0037] ​The beneficial effects of the embodiment are that: through the setting of the pneumatic system and the control system, the pneumatic system can inflate the air spring and control the air pressure inside the air spring to meet the requirements of different tests on different forces. The control system is responsible for the accurate coordination and closed-loop management of the entire test process. It collects sensor signals such as force and displacement in real time, adjusts the output of the servo valve, controls the actuator to perform dynamic loading according to the set load spectrum, so as to realize accurate control of test parameters, data monitoring and automatic operation. The pneumatic system and the control system jointly guarantee the safety, repeatability and high precision of the test.

[0038] The advantages of the embodiment are that: through the setting of the energy-saving device, it can exert an upward force on the loading beam and transmit the force to the upper end of the piston rod of the actuator. This force can balance the downward force of the piston rod, thereby realizing the balance of the initial static dynamic force (vehicle body gravity). Through the setting of the air spring, gas can be filled into the air spring to generate gas pressure and elastic deformation force. Moreover, by changing the gas pressure in the air spring, the requirements of different tests on different forces can be met, thereby improving the applicability of the equipment. The static load of the air spring changes relatively stably, and it can also respond quickly to dynamic load, so that the energy storage-energy release conversion can be realized. The two air springs are connected in series in an up-down manner, which can reduce the deformation amount of a single air spring during the experiment, so that the load change range is smaller, thereby prolonging the service life of the air spring. The two energy-saving devices arranged on both sides of the loading unit can balance the force on the piston rod and avoid the influence of the bending moment force on the piston rod, thereby improving the service life of the actuator. Through the setting of the pneumatic system and the control system, the air pressure inside the air spring can be controlled to meet the requirements of different tests on different forces. The control system is responsible for the accurate coordination and closed-loop management of the entire test process. It collects sensor signals such as force and displacement in real time, adjusts the output of the servo valve, controls the actuator to perform dynamic loading according to the set load spectrum, so as to realize accurate control of test parameters, data monitoring and automatic operation. The energy-saving device for suspension experiment provided by the present application can effectively balance the downward pulling force of the actuator, evenly distribute the load through a clever force transmission mechanism, significantly reduce the energy consumption of the suspension experiment device during operation, and greatly improve the energy-saving effect. The device has a simple structure and a wide range of applications, and can be widely used in suspension performance testing of various vehicles, has good application prospect, and has significant economic and social benefits.

[0039] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can easily think of changes or replacements within the scope of the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A kind of energy-saving device for suspension experiment, including rack (1), the top end of the rack (1) is connected with loading unit (2), the loading unit includes actuator (21), it is characterized by, The piston rod top end of the actuator (21) is connected with a loading beam (6), the bottom end of the piston rod is connected with a clamp (4), the loading beam (6) is connected with the top end of an air spring assembly (53), the bottom end of the air spring assembly (53) is connected with the rack (1), the downward pressure of the actuator (21) is conducted to the air spring assembly (53) through the loading beam (6), the air spring assembly (53) generates upward gas pressure and elastic deformation force under the pressure of the loading beam (6), so as to reduce the load required to be borne by the actuator (21).

2. The energy saving device for suspension experiment according to claim 1, characterized in that, A tension and compression load sensor (54) is further included, which is arranged at the lower end of the air spring assembly (53) and used to monitor the dynamic load borne by the air spring assembly (53).

3. The energy saving device for suspension experiment according to claim 2, characterized in that, The air spring assembly (53) includes at least one air spring, the air springs are connected in series through air spring connecting flanges (533), the top end air spring is connected with the loading beam (6), and the bottom end air spring is connected with the tension and compression load sensor (54).

4. The energy saving device for suspension experiment according to claim 3, characterized in that, The rack (1) is provided with a mounting seat assembly (51), which includes a bottom mounting plate (511), an upper fixed plate (513) and a sensor mounting plate (515), the bottom mounting plate (511) is fixedly mounted on the rack (1), the upper fixed plate (513) is connected with the bottom mounting plate (511) through a support column (512), the sensor mounting plate (515) is connected with the bottom mounting plate (511) through a small support column (514), and the tension and compression load sensor (54) is mounted on the sensor mounting plate (515).

5. The energy saving device for suspension experiment according to claim 2, wherein, A guide device (55) is further included, which includes a guide beam (552) and a guide rod (551), the guide beam (552) is connected with the air spring assembly (53), and the guide beam (552) is sleeved on the guide rod (551) and can slide up and down along the guide rod (551).

6. The energy saving device for suspension experiment according to claim 1, wherein, The air spring assembly (53) is provided in two, and the two air spring assemblies (53) are symmetrically arranged on the two sides of the loading unit (2).

7. The energy saving device for suspension experiment according to any one of claims 1 to 6, characterized in that, The air spring assembly (53) is connected with a pneumatic system, the pneumatic system is configured to supply gas to the air spring assembly (53) and adjust the internal gas pressure of the air spring assembly (53).

8. The energy saving device for suspension experiment according to claim 7, characterized in that, A control system is further included, which is connected with the loading unit (2), the tension and compression load sensor (54) and the pneumatic system respectively.

9. The energy saving device for suspension experiment according to claim 7, characterized in that, The pneumatic system includes a gas source treatment system, a proportional pressure reducing valve and a gas storage tank, the input end of the proportional pressure reducing valve is connected with the gas source treatment system, the output end of the proportional pressure reducing valve is connected with the gas storage tank, and the gas storage tank is connected with the air spring assembly (53).

10. The energy saving device for suspension experiment according to claim 8, characterized in that, The loading unit further includes a displacement sensor (30) and a load sensor (25), one end of the actuator (21) is connected with the displacement sensor (30), the other end is connected with the load sensor (25), the displacement sensor (30) is mounted on the top of the rack (1), and the load sensor (25) is connected with the clamp (4).

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