4772results about "Shock testing" patented technology

The invention discloses a valve vibration impact test method and system based on digital twinning, and belongs to the technical field of industrial equipment test and evaluation. The method comprises the following steps: firstly, deploying a multi-source sensor network, constructing a physical entity layer of a valve vibration impact test, collecting and preprocessing various physical monitoring data, and constructing a digital twinborn body layer; secondly, real-time data assimilation with a physical test bed is realized through parameter calibration and updating of a digital twinborn model based on various physical monitoring data and the digital twinborn layer; and finally, executing a virtual vibration impact test, realizing prediction and evaluation of global response and key part information of the physical entity according to a test result, and finally realizing interaction and performance prediction. And the valve vibration impact test is realized through the valve vibration impact test system. According to the method, the fault diagnosis capability, the early damage identification capability and the valve state prediction and evaluation capability can be remarkably improved, and the defect of insufficient field monitoring information is overcome.

The invention relates to the technical field of protection door testing, in particular to a method, a system and equipment for testing explosion shock wave resistance of a protection door and a medium. The method comprises the following steps: firstly, receiving position information of a to-be-tested protective door and a chemical explosive, confirming a test preparation state, and activating and verifying a connection state of a plurality of sensors arranged on the to-be-tested protective door when confirmation is completed; after the connection of all the sensors is verified to be correct, a detonation signal is sent to the chemical explosive, and chemical explosion shock waves are triggered; processing the original measurement data by using a preset abnormal value screening model, and filling data vacancy by adopting an interpolation method; finally, converting the processed chemical explosion shock wave load data into equivalent nuclear explosion shock wave load data by applying a preset conversion algorithm; the data quality is improved, and equivalent conversion from chemical explosion to nuclear explosion is realized, so that the nuclear explosion resistance of the protective door can be accurately evaluated under the condition that an actual nuclear explosion test is not carried out.

The chest structure of the simulation dummy for the bursting test comprises a thoracic vertebra assembly, and the thoracic vertebra assembly comprises an upper thoracic vertebra section, a thoracic vertebra elastic assembly and a lower thoracic vertebra section which are sequentially connected from top to bottom; the thoracic vertebra elastic assembly can generate elastic deformation when being vertically extruded, and the upper thoracic vertebra section or / and the lower thoracic vertebra section is / are provided with a thoracic vertebra acceleration sensor set used for collecting vertical acceleration information. The invention further discloses the simulation dummy for the bursting test, the dummy comprises the chest structure of the simulation dummy for the bursting test and further comprises a hip assembly arranged at the lower end of the chest structure, and the hip assembly comprises an abdomen structure and a lumbar vertebra assembly arranged on the rear side of the abdomen structure and connected with the lower end of the thoracic vertebra assembly. The abdomen structure is provided with a limiting step matched with the lower end structure of the thoracic vertebra assembly. The simulation dummy can serve as a real human body substitute to undertake a test task in places such as a bursting test and a protective lifesaving equipment test.

The invention discloses a sliding bearing-rotor system stability test system and method under an impact load, and relates to the field of rotating machinery test in mechanical engineering. According to the technical scheme, different types of impact loads are applied through a vibration acceleration platform, and starting, stopping or external impact force in actual working conditions is simulated. In the testing process, a high-precision sensor and a multi-channel acquisition board card are used for monitoring the vibration characteristic and the rotating speed of the system in real time, it is guaranteed that signals of different positions and types can be synchronously acquired, and comprehensive system state information is provided. Then, in combination with time domain and frequency domain analysis technologies, key features are extracted from mass data by applying an advanced Fourier transform algorithm, the resonant frequency, modal characteristics and potential fault modes of the system are identified, and accurate evaluation of the stability of the system is realized. Experimental results show that the real-time monitoring and analysis method can effectively improve the stability test precision of the sliding bearing-rotor system under the impact load, and provides powerful technical support for engineering application. The method is used for evaluating the stability of the sliding bearing-rotor system under the impact load.

The invention relates to the technical field of detection devices, and discloses a gear impact fatigue detection device which comprises a detection table and a plurality of supporting legs fixedly installed on the lower surface of the detection table, a T-shaped arc sliding groove is formed in the upper surface of the detection table, and an arc T-shaped sliding block is installed on the inner wall of the T-shaped arc sliding groove in a sliding mode. An arc T-shaped sliding block is manually pushed to slide along the inner wall of a T-shaped arc sliding groove, a rotating sleeve drives an impact block to adjust the impact position, a plug pin is inserted into an insertion hole to limit the position of the impact block, and when a spiral cam rotates, a push-pull rod is driven by a driving column to move away from a gear body, so that the impact position is adjusted. The impact angle of the impact block can be conveniently adjusted through the device, so that the device can detect impact resistance data of different positions of teeth of the gear body, and the reliability of the data is greatly improved.

The invention discloses a high-temperature and high-pressure multifunctional integrated shock tube test system, belongs to the technical field of explosion and impact dynamics tests, and aims at solving the problem that an existing shock tube is usually single in function and is only used for a simulation test of a certain function. The high-pressure section and the low-pressure section of the shock tube are both made of high-temperature-resistant nickel-based alloy, an induction heater is adopted for heating, high-pressure inert gas is filled into the high-pressure section through pressure gradients of diaphragm sets with different layers of diaphragm clamping sections, high temperature and high pressure of the high-pressure section at the temperature of 20-900 DEG C and the pressure of 0.1-50 MPa are obtained, and the high-pressure shock tube has the advantages that the high-pressure shock tube is compact in structure and low in cost. The multifunctional integrated shock tube test system can be used for researching the crushing characteristics of rock materials under the conditions of different pressures, temperatures, water contents and the like, the damage characteristics of explosion shock waves in the air to a target piece and the impact damage characteristics of a high-speed projectile body. Effective methods and means are provided for related research, and the shock tube test technology and engineering application capability are expanded. The test system is easy to implement, low in cost and multipurpose.

The invention relates to the technical field of battery detection equipment, and discloses external force resistance detection equipment for a new energy battery, which comprises a detection room as a basic component of the whole device, and a detection cavity is arranged in the detection room and is used for assembling and bearing each processing mechanism and a lower structural member to which the processing mechanism belongs; and the toughened glass door is arranged at the middle upper part of the front side of the detection room, and is used for workers to go in and out of the detection room and observe the new energy battery when the new energy battery is detected. By adding and arranging the impact test mechanism, when the new energy battery is subjected to an external force resistance test, on one hand, the mechanism can accurately simulate a complex scene that a new energy automobile suffers from impact at different angles in a driving process, so that a test result and data are highly close to reality and are more authentic and representative, and on the other hand, the impact test mechanism can accurately test the external force resistance of the new energy battery. The mechanism can also truly simulate the extreme situation that the new energy battery is impacted by shock waves when the new energy automobile turns over and falls during driving, so that the battery performance can be comprehensively evaluated.

Provided in the present invention application is a test identification method and apparatus for vibration-involved dynamic parameters of a bearing pedestal and using additional masses. The method comprises: simplifying a dynamic model of a bearing pedestal into a single-degree-of-freedom system; applying an excitation force to the bearing pedestal, testing a response, plotting a frequency spectrogram, and obtaining a resonance frequency; adding additional masses to the bearing pedestal, and testing inherent frequencies under different additional masses; calculating vibration-involved masses on the basis of test results; plotting a curve of the vibration-involved masses changing with the additional masses, performing fitting by using the least-squares method, and performing extrapolation, so as to obtain a vibration-involved mass for when the additional mass is 0 and use same as a vibration-involved mass of the bearing pedestal; adding additional masses to the bearing pedestal, and testing damped vibration responses under different additional masses, so as to obtain logarithmic decrements and damping factors; plotting a curve of the damping factors changing with the additional masses, obtaining a damping factor in the same manner to use as a damping factor of the bearing pedestal, and performing calculation on the basis of the damping factor and the mass to obtain a vibration-involved stiffness coefficient of the bearing pedestal. The present invention using the solution can realize accurate identification of vibration-involved dynamic parameters of a bearing pedestal.

The invention relates to the technical field of bumper detection, in particular to an automobile bumper detection method and system, and the system comprises a rigid test bench, a multi-point adjustable impact loading module, a bumper surface deformation monitoring module, and a control and processing module. The to-be-tested automobile bumper is fixed on the test bench according to a preset mode, and the plurality of sensors are arranged based on a preset position; carrying out dynamic and static balance test on the to-be-tested automobile bumper according to the received control instruction, and carrying out corresponding index calculation; on the basis of static and dynamic test indexes, a quantitative report is generated, whether the balance of the bumper structure reaches the standard or not is automatically judged, complex static supporting and dynamic impact working conditions possibly encountered by the bumper on a vehicle can be effectively simulated in an integrated process, the static stability of the overall structure and the coordination under power impact of the bumper can be quantitatively evaluated, and the reliability of the bumper structure is improved. Therefore, the structural safety performance of the bumper can be reflected more truly.

The invention relates to the technical field of pump production and detection, and discloses a large-flow flood prevention pump and a pump body detection device thereof.The large-flow flood prevention pump comprises a machine base, a detection table fixedly arranged on the machine base, a pump base fixedly arranged on the detection table, a pump shell fixedly arranged on the pump base, a water inlet formed in one side of the pump shell, a vertical frame fixedly arranged on the machine base, and a third air cylinder fixedly arranged on the vertical frame; a cylinder is fixedly connected to one side of the mounting plate; movable rods are symmetrically arranged on the cylinder in a sliding manner; pressure springs are arranged on the movable rods; one ends of the pressure springs are connected with the inner wall of the cylinder; and the other end is provided with an inclined block. According to the pump body detection device of the large-flow flood prevention pump, impact detection is conducted through the moving rod located in the pump shell, so that the impact resistance in the pump shell is monitored, the situation that in the actual flood prevention process, the inner wall of the pump shell is impacted by foreign matter and damaged is avoided, and the product strength of the flood prevention pump is improved.

The invention belongs to the field of gas explosion test technology development, and relates to a reinforced full-size residential building structure gas leakage explosion multi-parameter test platform and method, which can be used for simulating the whole process of a gas leakage explosion accident in a real residential building scene. The gas leakage explosion evolution mechanism and disaster-causing consequence research under multiple ignition sources, multiple gas types, multiple pressure relief conditions and multiple obstacle environments can be realized. The test platform can simulate a resident house type, and through local reinforcement design and coupling test technology development of the test platform, a high detonation pressure, high simulation and multi-parameter gas explosion repeated test is realized.

The present invention belongs to the technical field of impact tests, and particularly relates to a catapult take-off and arrested impact test apparatus, comprising a supporting frame, an auxiliary supporting and guiding apparatus above the supporting frame, a mounting base below the supporting frame, a servo actuator, an oil circuit system, and a control and measurement system. The oil circuit system comprises an oil source, a low-pressure accumulator group, a high-pressure accumulator group, an oil inlet valve block, an oil return valve block, a servo valve block, an oil source low-pressure oil return pipe, an oil source high-pressure oil outlet pipe, and necessary tubes among components. The control and measurement system comprises a vibration and impact loading upper computer, a vibration impact controller, a static loading upper computer, a hydraulic servo controller, a servo valve, and an accelerometer. The servo actuator is internally provided with a displacement sensor. The present invention can be widely applied to conventional vibration and impact tests of various suspension launch apparatuses in a suspension-mounted state, as well as arrested impact tests under composite waveforms.

The invention discloses a machine tool assembly consistency evaluation method and device, and belongs to the field of machine tool assembly.The machine tool assembly consistency evaluation method includes the steps of component dynamic stiffness testing, whole machine dynamic stiffness testing, frequency response function analysis, characteristic frequency range determination, dynamic stiffness data statistics, dynamic stiffness evaluation theoretical value acquisition, dynamic stiffness evaluation and the like. Quality of key components is controlled from subassembly to final assembly, assembly consistency testing is carried out in all links of assembly, if assembly quality problems or assembly consistency problems are found, earlier-stage processing can be carried out, troubleshooting time is shortened, assembly efficiency is improved, assembly precision and efficiency of a machine tool can be improved, and quality and performance of products can be guaranteed.

Embodiments disclosed herein relate to electronic devices, and more particularly to estimating a damage risk level for an electronic device. A method disclosed herein includes measuring motion parameters of the electronic device, on the electronic device being dropped on a surface. The method further includes classifying the surface into at least one type by processing the measured motion parameters using a classifier module. The method further includes estimating a damage risk score depicting the damage risk level for the electronic device based on the classified surface, the measured motion parameters of the electronic device, and a usage history of the electronic device.

The invention relates to the technical field of engine testing, and discloses a reliability test method and system for a small general engine, and the method comprises the steps: collecting an engine vibration signal through a superconducting quantum interferometer, and collecting a temperature distribution parameter through a quantum dot temperature sensor; performing combined testing of cold and hot shock, high-load operation and random working conditions, and synchronously monitoring dynamic response characteristic data; constructing a Weibull probability model, and determining key influence factors through a global sensitivity analysis method; acquiring a surface roughness parameter by adopting a field emission scanning electron microscope, obtaining a material component parameter through energy spectrum analysis, and establishing a parameter mapping relation; establishing a vibration and temperature early warning system, executing a graded sweep frequency excitation and abrasive particle acceleration test, and recording a parameter degradation process; and generating a three-dimensional parameter cloud picture, and outputting a reliability test report. According to the method, the reliability of the small general engine can be comprehensively and efficiently evaluated, and a scientific basis is provided for design, maintenance and improvement of the engine.

The invention discloses an impact load simulation test bench for a friction torque limiter, which belongs to the technical field of detection and comprises a base guide rail, an experimental device and a support are fixedly connected and mounted on the guide rail, an output end of a variable frequency motor is connected with a torque sensor through a coupler, and the other end of the torque sensor is connected with the friction torque limiter. The other end of the friction torque limiter is connected with the torque sensor, the other end of the torque sensor is connected with the eddy current brake, and the other end of the eddy current brake is connected with the electric hydraulic drum brake. According to the invention, the eddy current brake is used as a load to realize operation under different torques, and the electric hydraulic drum brake simulates different impact loads to carry out performance detection on the friction torque limiter in overload and impact states. In addition, the device supports friction torque limiters of different models, and can meet more experiment requirements.

The invention discloses an aircraft landing gear drop test device and method, and relates to the technical field of aircraft landing test devices.The aircraft landing gear drop test device comprises a platform, and a supporting structure is arranged on the platform; the rack is movably connected with the supporting structure so as to ascend and descend relative to the supporting structure. Moreover, a mounting seat is arranged on the rack so as to be connected with the undercarriage; the connecting seat is arranged on the platform and is arranged below the rack; the test box body is detachably connected to the connecting base, and the test box body is provided with a first cavity with an upward opening so as to contain a pavement material. According to the undercarriage drop test device and the undercarriage drop test method, different pavement materials can be loaded in the first cavity of the test box body, so that different pavement structures are formed, and the undercarriage drop test device can perform simulation experiments on various pavement working conditions.

The invention discloses lithium battery safety performance detection equipment, and relates to the technical field of detection equipment. A fixing mechanism is arranged above the rotating plate, a vibrating mechanism is arranged between the fixing mechanism and the rotating plate, a supporting frame is fixedly connected to the upper end of the workbench, a sealing cover is arranged on the inner side of the supporting frame, an impacting mechanism is arranged on the rear side of the sealing cover, and an air blower, a heater and a refrigerating mechanism are arranged below the workbench. The equipment integrates a plurality of testing functions such as rotation, vibration, falling and impact, can comprehensively evaluate the safety performance of the lithium battery under various extreme conditions, and improves the testing efficiency and accuracy; in the fixing mechanism, clamping plates on the two sides are matched to clamp and fix the lithium battery, and the distance between the two clamping plates is adjustable, so that different types of batteries can be tested conveniently. And by adopting the design of the sealing cover, the fixing mechanism and the like, the stability and the safety of the lithium battery in the testing process are ensured, and the pollution and the damage to the surrounding environment in the testing process are prevented at the same time.

The invention discloses an electric appliance production quality full-automatic detection tool, and relates to the technical field of electric appliance detection, and the tool comprises an installation mechanism, and also comprises a swing mechanism which is installed on the inner wall of the installation mechanism and is used for driving a circuit board of an electric appliance to swing in a reciprocating manner; the circuit board mounting mechanism is connected with the mounting mechanism and the swinging mechanism and is used for fixing and electrically connecting a circuit board of the electric appliance; the collision adjusting mechanism is connected with the mounting mechanism and is used for switching a contact position with the circuit board mounting mechanism; the circuit board is driven to shake in a reciprocating mode, shaking in the transportation process is simulated, the circuit board is vibrated due to collision generated in the shaking process, collision in the transportation process is simulated, and the collision position is continuously adjusted in the collision process, so that multi-position collision testing is achieved. The welding firmness of the circuit board device and the quality of the circuit board device in the vibration process can be detected by simulating the transportation environment, so that the quality of the circuit board of the electric appliance is obtained.

The invention discloses a piezoelectric ceramic stack driven impact press-in test method and a test system thereof. According to the invention, a piezoelectric ceramic stack is used as a drive, a sample is carried on a displacement table, measurement parameters in an impact press-in test are monitored through a force sensor and a displacement sensor, a computer is used for realizing accurate control and subsequent processing and analysis of the measurement parameters, and the whole test adopts electric control actuation; the device is simple in structure and convenient to operate and control, the pressure head can be accurately controlled to be impacted and pressed into the surface of a sample at a certain speed, and the maximum press-in load and the maximum press-in depth in the impact press-in process can be estimated according to the maximum output displacement of the pressure head under the free condition; compared with other impact press-in tests, the impact press-in test method has the advantages that the safety and the stability are well guaranteed, and the impact press-in test method has great application potential.

The invention relates to the technical field of lens testing, and discloses a multifunctional optical lens testing lens device which comprises a connecting frame. A casing; a lens body; the positioning assembly is used for fixing the position when the lens body is detected; the detection assembly is used for carrying out multidirectional detection on the lens body; the detection assembly comprises an air pressure detection part, an impact detection part and a vibration detection part; and a driving assembly. According to the multifunctional optical lens testing lens device, multi-direction detection of the lens can be realized through the arranged detection assembly, and multi-direction synchronous detection in vibration, impact, air tightness, waterproofness and high-temperature environments is realized, so that each detection is in a linked state, the detection effect of the lens in different high-complexity environments is improved, and the detection efficiency is improved. And the whole detection process is carried out in one device, and single position conversion is not needed, so that a high-intensity environment is provided for the test of the lens, and the stability of the lens is finally detected.

The invention provides a swing impact test device for a sand bag of a seat backrest of a rail transit passenger car. The swing impact test device comprises a test bed, a support frame, a lifting assembly, a support cross beam and a swing impact assembly, the test bed is used for installing a seat, the lifting assembly is arranged on the supporting frame, the supporting cross beam and the supporting frame are arranged in a sliding mode, and the lifting assembly drives the supporting cross beam to move in a lifting mode; the swing impact assembly comprises a connecting beam, a swing arm, a pendulum bob, a pull rope and a pull driving source. The connecting beam is connected with the supporting cross beam, the swing arm is hinged to the connecting beam, the pendulum bob is connected with one end of the swing arm, and the pull rope is connected with the other end of the swing arm. And the pull driving source pulls the pull rope, so that the pendulum bob impacts the backrest of the seat. According to the invention, impact tests can be conveniently carried out on different heights of the seat backrest.

The invention provides a multi-physical-field collaborative generation experiment method for a floating tunnel truncation model, and belongs to the technical field of floating tunnel tests, and the method can efficiently and accurately simulate the multi-field coupling effect of waves, ocean currents and earthquakes. And a reliable experiment means is provided for researching the dynamic response and the safety performance of the floating tunnel structure under the complex environmental load. The experimental method comprises the steps of truncation design of a full-scale ultra-long floating tunnel prototype, design of a reduced scale floating tunnel truncation model, construction of a wave-flow-earthquake multi-field input system and collection of dynamic response of the reduced scale floating tunnel truncation model. According to the invention, stable lateral earthquake input can be realized based on the existing wave-flow water channel, the influence of the earthquake effect transmitted from the cable to the tension leg type suspension tunnel pipe body on the dynamic response can be simulated, and the coupling effect of wave, flow and earthquake can be reproduced; and a wave-flow-earthquake multi-field collaborative generation experiment scheme is provided for the ultra-long tension leg type floating tunnel truncation model.

The invention relates to the technical field of vehicle suspension testing, and particularly discloses an air spring suspension durability testing device, which is used for vertical static, transverse dynamic and longitudinal dynamic durability testing of an air spring suspension, and comprises an upper mounting unit, a lower mounting unit, a lower mounting unit and a lower mounting unit, and is characterized in that the upper mounting unit comprises an outer cylinder and an inner ejector rod which are nested, and the outer cylinder is matched with an upper piston rod of the air spring suspension; the posture adjusting unit comprises a fixed disc fixed to the base and a movable disc movably arranged on the fixed disc, a transverse guide groove and a longitudinal guide groove which are perpendicularly intersected are formed in the fixed disc, and a first guide block and a second guide block are arranged on the lower end face of the movable disc; and the lower mounting unit is used for being matched with a lower piston rod suspended by the air spring. Through cooperation of different states of the first guide block and the second guide block in the movable disc, the degree of freedom of the movable disc relative to the fixed disc is adjusted, so that durability testing of the air spring suspension in different working condition simulation states is realized, and the performance of the air spring suspension in an actual working condition is fully reflected.

The embodiment of the invention provides a power distribution cabinet detection device, and relates to the field of power distribution cabinet detection. A power distribution cabinet detection device comprises a base, the upper end of the base is connected with a top plate, the upper end of the top plate is rotatably provided with a rotary table, a vibration detection mechanism is installed between the top plate and the base, one side of the top plate is provided with an adjusting frame, an impact detection mechanism is slidably installed in the adjusting frame, and the impact detection mechanism adjusts the detection position through sliding in the adjusting frame. The detection height is adjusted through sliding of the moving seat in the adjusting frame, the pressure block is pushed by the third air cylinder to impact the power distribution cabinet, the safety of the power distribution cabinet when the power distribution cabinet is suddenly impacted is detected, meanwhile, the second air cylinder pushes the fixing plate to move, the fixing plate is made to be away from the moving seat, the third air cylinder and the pressure block are made to be vertically downward in combination with rotation of the rotating rod, and the safety of the power distribution cabinet is improved. The top of the power distribution cabinet can be conveniently subjected to impact detection, and whether the power distribution cabinet and internal elements can be kept intact or not is judged.

The invention relates to a collision dummy thoracic structure capable of reflecting thoracic motion characteristics of a human body. Comprising a chest spine module, a costal vertebra joint module, a rib module and a sternum, a neck connecting block is arranged at the upper end of the chest spine module, the costal vertebra joint module is used for connecting a thoracic vertebra of the chest spine module with a rib of the rib module, and the sternum is connected with the rib module; the chest spine module has the freedom degrees of torsion, bending, stretching and lateral bending; ribs and thoracic vertebrae have rotational degrees of freedom through the costal vertebra joint module; the rib module further comprises costal cartilages made of elastic high polymer materials, and the costal cartilages are connected between the ribs and the sternum. According to the method, human anatomy and human kinematics are combined, the influence of thoracic motion response on chest injury in the collision process is fully considered, the biological fidelity of the dummy model is improved, and then the reliability of dummy chest injury parameters in the automobile collision test is guaranteed.

The utility model relates to an omni-directional impact performance test device for a backrest and a headrest of an automobile seat, which belongs to the technical field of automobile seat test devices and comprises a test board, an impact head, a height adjusting mechanism and an angle adjusting mechanism. The impact head exerts impact force on a backrest and a headrest of an automobile seat, the height adjusting mechanism drives the impact head to move up and down in a vertical plane so as to adjust the installation height of the impact head, the angle adjusting mechanism drives the impact head to rotate in the horizontal plane and the vertical plane, and all-directional impact resistance testing is conducted on the backrest and the headrest of the automobile seat. According to the utility model, the technical problems in the prior art that the application range of seat backrests at different inclination angles is limited, the test positions of the seat backrests and headrests are not comprehensive, and rapid and continuous tests cannot be carried out can be solved.

The invention provides a multi-vision fusion mining explosion-proof equipment explosion-proof performance evaluation method, and relates to the technical field of intelligent detection, and the method comprises the steps: 1, obtaining flame images of visible light and infrared light; the method specifically comprises the steps that flame images are captured at the same time through an industrial camera and a thermal imager, the images of the industrial camera are stored as a visible light image sequence, the images of the thermal imager are stored as an infrared image sequence, and a time label is bound with each frame of image; step 2, data processing of visible light and infrared images; step 3, optimizing the single-vision image data; the method specifically comprises the following steps: optimizing the features of a visible light image; a feature optimization step of the infrared image; standardizing the feature representation; step 4, feature level fusion of visible light and infrared vision; comprising a feature matrix construction step and a feature level fusion step. And step 5, quantitative evaluation of the explosion-proof performance is carried out based on the visual features.

The invention discloses an oil return buffer device and an impact test system with the same. The oil return buffer device comprises a cylinder barrel assembly, a buffer piston, an impact piston, an overflow detection loop, an oil charge detection loop and an air charge detection loop. A first inner barrel cavity, a damping hole and a buffering cavity are formed in the cylinder barrel assembly, and the buffering cavity is connected with an oil filling detection loop. The buffer piston is arranged in the first inner cylinder cavity so as to divide the first inner cylinder cavity into a first side cavity and a second side cavity. The buffer piston is provided with a second inner cylinder cavity, the impact piston is arranged in the second inner cylinder cavity to divide the second inner cylinder cavity into an oil return cavity and an air cavity, the oil return cavity communicates with the first side cavity, and the air cavity communicates with the inflation detection loop. The device has the obvious impact stage and the buffering stage, the instant impact pressure is rapidly reduced in the impact stage, the deceleration back pressure is obtained through oil pressure loss in the buffering stage, the buffering effect is obvious and easy to control, and the device is suitable for the field of high-speed large-flow oil return buffering of an impact hydraulic system.

The utility model relates to an impact detection device for a battery pack, which comprises a bottom plate, the top of the bottom plate is fixedly connected with a frame body, the top of the bottom plate is provided with a limiting assembly, the surface of the frame body is provided with a detection assembly, and the detection assembly comprises an electric push rod fixedly connected with the top of the bottom plate. A connecting plate is fixedly connected to the top of the electric push rod, and a fixing plate is fixedly connected to the front face of the connecting plate. According to the impact detection device for the battery pack, the battery pack needing to be detected is placed on the detection table, the battery pack is limited through a limiting assembly, an electric push rod is started to drive a connecting plate and a fixing plate to move, the fixing plate moves to drive an impact head to be adjusted up and down, and after adjustment is completed, a motor is started to drive a cam to rotate; the rotating cam is matched with the spring to realize up-down reciprocating motion of the limiting plate, the telescopic rod, the mounting plate and the impact head, and the impact head can perform reciprocating impact on the battery pack through up-down reciprocating motion, so that the purpose of impact resistance detection is realized.