Detection equipment for buffering and energy absorption of light honeycomb material and evaluation method thereof

Abstract

The invention discloses detection equipment for buffering and energy absorption of a light honeycomb material and an evaluation method of the detection equipment, and belongs to the technical field of material performance testing. The detection equipment for buffering and energy absorption of the light honeycomb material comprises a rack, a sliding rod, a lifting part, an impact head and a controller, a sample support is arranged in the center of the bottom plate; the mounting plate is in sliding connection with the sliding rod through a sleeve; a threaded groove is formed in the sleeve in the axial direction. An air inlet is formed in the side wall of the lower end of the sleeve; an air outlet is formed in the top end of the sleeve; according to the detection equipment for buffering and energy absorption of the light honeycomb material, the automatic process of lifting the impact head and impacting can be realized; oil mist is sprayed between the sleeve and the sliding rod, friction between the sleeve and the sliding rod is reduced, meanwhile, upward spraying force of the oil mist pushes the impact head, friction between the sleeve and the sliding rod is compensated, free falling motion of the impact head is achieved, and the accuracy of a test result is improved.

Description

Technical Field

[0001] The invention relates to the technical field of material performance testing, and in particular to a detection device for light honeycomb material buffering and energy absorption and an evaluation method thereof. Background Art

[0002] Honeycomb material is a special material that imitates the cell structure of a natural beehive. Its honeycomb structure is generally composed of a series of hexagonal, quadrilateral or other honeycomb-like cells. At present, honeycomb materials are generally made by stretching. The honeycomb materials formed by stretching are widely used in aerospace, aviation, rail transportation and other fields due to their high strength and light weight.

[0003] The existing technical parameters for evaluating buffer performance are mainly concentrated on the load characteristics of the sample, which are obtained through static load method, dynamic impact method and high-speed compression method. According to the actual application of the buffer, the dynamic impact method is closest to the actual working condition, and a drop hammer impact tester is used to test the dynamic impact method.

[0004] The drop hammer impact testing machine is composed of a frame, guide rails, an impact head and counterweight, a lifting device, and a control device. Its basic principle is to use the speed of free fall to impact load the specimen, so as to study the response of materials and structures under impact loads. During the experiment, the specimen is located at the bottom of the guide rail, and the impact head and counterweight are located above the specimen. The impact head and counterweight are lifted by the control device and the lifting device. When they reach the specified height, they are released. After that, the impact head and counterweight will perform free fall along the guide rail, and finally hit the specimen to achieve loading. Although the setting of the guide rail can limit the sliding trajectory of the drop hammer, so that the drop hammer falls in the vertical direction, it cannot overcome the influence of the friction of the guide rail, which affects the accuracy of the test results. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a detection device for light honeycomb material buffering and energy absorption and an evaluation method thereof, which can reduce the friction during the impact of the impact head and improve the accuracy of the test results.

[0006] The technical solution of the present invention is as follows:

[0007] A light honeycomb material buffering and energy absorption detection device, comprising a frame, a lifting part, an impact head and a controller;

[0008] The frame includes a bottom plate, columns arranged at the four corners of the bottom plate, and a top plate arranged at the top ends of the columns;

[0009] A sample support is provided at the center of the bottom plate, and the interior of the cylinder of the sample support is used to place the lightweight honeycomb material;

[0010] Sliding rods are arranged between the bottom plate and the top plate symmetrically about the sample support;

[0011] The lifting part includes a mounting plate sliding on the slide rod and a device for driving the mounting plate to lift. The impact head is arranged at the lower part of the mounting plate, and the impact head corresponds to the sample support up and down.

[0012] A mounting plate release device is installed below the device driving the mounting plate to control the fixing and release of the mounting plate;

[0013] The mounting plate and the slide bar are slidably connected via a sleeve, the sleeve is fixedly arranged at both ends of the mounting plate, and there is a gap between the sleeve and the slide bar;

[0014] A thread groove is provided inside the sleeve along the axial direction; an air inlet is provided on the side wall of the lower end of the sleeve, the air inlet is communicated with the lower end of the thread groove, a pipeline connection portion is provided outside the air inlet, the pipeline connection portion is connected to one end of the oil mist gas branch pipeline, the other end of the oil mist gas branch pipeline is connected to the oil mist gas main pipeline through a diverter, the other end of the oil mist gas main pipeline is connected to the oil mist gas generator, the oil mist gas generator is electrically connected to the controller, and three air outlets parallel to the axial direction of the sleeve are provided along the circumference of the top end of the sleeve, the air outlets are parallel to the axial direction of the sliding rod, and the air outlets are connected to the upper end of the thread groove;

[0015] The oil mist gas branch pipeline includes a left oil mist gas branch pipeline and a right oil mist gas branch pipeline, which respectively correspond to the pipeline connection parts of the sleeves connected to the left and right ends of the mounting plate, and the left oil mist gas branch pipeline and the right oil mist gas branch pipeline have the same length;

[0016] A load sensor is arranged on the inner bottom surface of the sample support, and the bottom of the lightweight honeycomb material is in contact with the load sensor;

[0017] A first bracket is arranged on the bottom plate, and a laser displacement sensor is arranged on the first bracket;

[0018] A second bracket is arranged on the bottom plate, and a laser speed sensor is arranged on the second bracket.

[0019] According to the aforementioned detection device for light honeycomb material buffering and energy absorption, the mounting plate includes an upper mounting plate and a lower mounting plate, and the sleeves at the left and right ends of the upper mounting plate and the lower mounting plate are respectively connected to the left oil mist gas branch pipeline and the right oil mist gas branch pipeline;

[0020] A weight mounting rod is symmetrically arranged between the upper mounting plate and the lower mounting plate about the sample support, each weight mounting rod is movably arranged with at least one weight of the same number, and a fastening nut is arranged on the top of the uppermost weight to fix the weight on the weight mounting rod;

[0021] A steel ball placing cylinder is movably arranged at the center position of the lower surface of the upper mounting plate, a steel ball is placed in the steel ball placing cylinder, an inner wall of the steel ball placing cylinder is provided with an internal thread, a steel ball limiting cover is arranged inside the steel ball placing cylinder, an external thread matching with the internal thread of the steel ball placing cylinder is arranged on the circumferential side surface of the steel ball limiting cover, and the steel ball placing cylinder is threadedly connected with the steel ball limiting cover;

[0022] The impact head is arranged at the lower center position of the lower mounting plate;

[0023] An auxiliary mounting portion is arranged on the upper surface of the steel ball limiting cover.

[0024] Furthermore, a steel ball placing tube fixing column is arranged at the center position of the lower surface of the upper mounting plate, a blind screw hole is opened on the upper part of the steel ball placing tube fixing column, a countersunk hole corresponding to the blind screw hole is arranged on the upper mounting plate, the steel ball placing tube fixing column is fixedly connected to the upper mounting plate by screws, an external thread matching the internal thread of the steel ball placing tube is arranged on the circumferential surface of the steel ball placing tube fixing column, and the steel ball placing tube is threadedly connected to the steel ball placing tube fixing column.

[0025] According to the aforementioned detection device for light honeycomb material buffering and energy absorption, the device for driving the installation plate to rise and fall includes a driving motor above the top plate and a transmission housing located at the center of the upper surface of the top plate, and the driving motor is electrically connected to the controller;

[0026] Two mutually perpendicularly meshed bevel gears are arranged in the transmission housing, the output shaft of the driving motor is connected to one of the bevel gears, the other bevel gear is connected to a lead screw, and the lead screw is connected to the driving motor through the bevel gear;

[0027] Through holes are provided at the top of the transmission housing and the center of the top plate, and the through holes of the transmission housing and the top plate are respectively connected to the screw rod in a sliding manner.

[0028] According to the aforementioned detection device for light honeycomb material buffering and energy absorption, the mounting plate release device is an electromagnet, and the electromagnet is electrically connected to the controller;

[0029] An iron plate is arranged at the center of the mounting plate, a threaded connection column is arranged at the center of the bottom of the iron plate, a threaded hole matching the threaded connection column is arranged in the middle of the mounting plate, and the threaded connection column is connected to the threaded hole;

[0030] When the electromagnet is in a powered-on state, the electromagnet and the iron plate are attracted to each other; when the electromagnet is in a powered-off state, the electromagnet and the iron plate are disconnected.

[0031] According to the aforementioned detection device for light honeycomb material buffering and energy absorption, a weighing sensor is arranged between the device for driving the mounting plate to rise and fall and the mounting plate releasing device, and the weighing sensor detects the weight of the mounting plate, weights and steel balls.

[0032] According to the aforementioned light honeycomb material buffering and energy absorption detection equipment, a sleeve mounting ring is provided at the top of the sleeve, screw holes are provided on the sleeve mounting ring and the mounting plate, and the sleeve mounting ring and the mounting plate are connected by screws.

[0033] According to the aforementioned detection equipment for light honeycomb material buffering and energy absorption, a level adjustment device is provided at the bottom end of the column, and a level bubble meter is provided on the upper surface of the bottom plate.

[0034] According to the aforementioned detection device for light honeycomb material buffering and energy absorption, the horizontal adjustment device comprises a base, a leg body movably connected to the base, and a connecting plate threadedly connected to the leg body;

[0035] The leg body includes a rotating ball, a screw rod on the rotating ball, and an adjusting nut between the rotating ball and the screw rod, and the rotating ball, the screw rod and the adjusting nut are fixedly connected;

[0036] A ball groove is provided on the upper part of the base, and the rotating ball of the leg body is arranged in the ball groove. A round hole matching with the screw rod is provided in the middle of the connecting plate. A connecting nut is fixedly provided on the lower surface of the connecting plate. The connecting nut under the connecting plate is threadedly connected with the screw rod of the leg body. The connecting plate is fixed to the bottom end of the column by screws. An end connecting hole is provided at the bottom end of the column, and the screw rod of the leg body is passed through the end connecting hole.

[0037] The method for evaluating the lightweight honeycomb material using the aforementioned lightweight honeycomb material buffering and energy absorption detection equipment comprises the following steps:

[0038] S1. Measure the sample heights of at least three locations of the lightweight honeycomb material to be tested, and calculate the average height h1 before impact;

[0039] S2. placing the lightweight honeycomb material to be tested into the sample support;

[0040] S3, adjusting the device of the lifting part driving the mounting plate to move the mounting plate to the required height along the slide bar;

[0041] S4, the controller controls the mounting plate release device to drive the impact head to freely drop down with the mounting plate, and at the same time the controller controls the oil mist generator to spray the oil mist with a preset flow rate and a preset mixing ratio into the sleeve;

[0042] S5, the impact head impacts the lightweight honeycomb material to be tested, and the dynamic data analyzer obtains the real-time data of the compression deformation ε of the laser displacement sensor and the impact load F of the load sensor;

[0043] S6. Adjust the device driving the mounting plate of the lifting part to lift the impact head away from the lightweight honeycomb material, take out the lightweight honeycomb material after impact, measure the height of the lightweight honeycomb material after impact, keep the measuring position consistent with that before the test, and calculate the average height h2 after impact;

[0044] S7, exporting the real-time data of the compression deformation ε and the impact load F to the computer;

[0045] S8, fitting the impact load F and the compression deformation ε to obtain an impact load F-compression deformation ε curve;

[0046] The instantaneous maximum force F1 when the impact head contacts the lightweight honeycomb material to be tested and its corresponding compression deformation ε1, the stable load F2 at the inflection point of the impact material load in a stable state and its corresponding compression deformation ε2 are analyzed, and the energy absorption response sensitivity K is used to evaluate the energy absorption speed of the lightweight honeycomb material. The calculation formula is as follows:

[0047] ;

[0048] The compression deformation ε3 corresponding to the compacted state of the lightweight honeycomb material is analyzed, and the energy absorption stability R is used to evaluate the energy absorption stability of the lightweight honeycomb material. The calculation formula is as follows:

[0049] ;

[0050] The closer R is to 1, the more stable the energy absorption process of the lightweight honeycomb material is;

[0051] The compression rate S is used to evaluate the impact resistance of lightweight honeycomb materials. The calculation formula is as follows:

[0052] ;

[0053] The smaller S is, the better the lightweight honeycomb material's performance in resisting impact is.

[0054] The present invention has the following beneficial effects:

[0055] (1) The detection device for light honeycomb material buffering and energy absorption of the present invention can realize the automated process of lifting the impact head and impacting, which greatly improves the work efficiency and operation safety;

[0056] (2) By spraying oil mist between the sleeve and the slide rod, the friction between the sleeve and the slide rod is reduced. The upward spray force of the oil mist pushes the impact head, compensating the friction between the sleeve and the slide rod, realizing the free fall motion of the impact head, and improving the accuracy of the test results;

[0057] (3) The counterweight can be adjusted precisely, further improving the accuracy of the test results;

[0058] (4) During the impact process, the laser velocity sensor, laser displacement sensor, and load sensor can accurately obtain dynamic mechanical data such as impact velocity, compression deformation, and impact load from the test, thereby clearly reflecting the impact resistance of the lightweight honeycomb material and analyzing its functional reliability and structural integrity;

[0059] (5) By installing a horizontal adjustment device at the bottom of the column, the slide rod is kept in a vertical state to avoid collision between the sleeve and the slide rod during the free descent of the mounting plate, thus ensuring the smooth progress of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] FIG1 is a perspective view of a detection device for light honeycomb material buffering and energy absorption;

[0061] FIG2 is a partial enlarged view of point A in FIG1;

[0062] FIG3 is a top view of a detection device for light honeycomb material buffering and energy absorption;

[0063] FIG4 is a cross-sectional view taken along line BB in FIG3 ;

[0064] FIG5 is a partial enlarged view of point C in FIG4;

[0065] FIG6 is a perspective view of the connection state of the iron plate and the threaded connection column;

[0066] FIG7 is a perspective view of the assembly state of the mounting plate, the slide rod, the sleeve, the weight mounting rod, the weight and the steel ball placement tube;

[0067] FIG8 is a perspective view of the upper mounting plate, the steel ball placing tube fixing column, the steel ball placing tube and the screw in a separated state;

[0068] FIG9 is a perspective view of a steel ball limiting cover provided with a handle;

[0069] FIG10 is a perspective view of a tool insertion slot provided in a steel ball limiting cover;

[0070] FIG11 is a front view of the steel ball placement tube;

[0071] FIG12 is a cross-sectional view taken along the line DD in FIG11 ;

[0072] FIG13 is a three-dimensional diagram of the assembly state of the base plate, the first bracket, the laser displacement sensor, the second bracket, and the laser speed sensor;

[0073] FIG14 is a top view of the assembly state of the base plate, the first bracket, the laser displacement sensor, the second bracket, and the laser speed sensor;

[0074] FIG15 is a cross-sectional view taken along line EE in FIG14 ;

[0075] FIG16 is a perspective view of the bottom plate;

[0076] Fig. 17 is a perspective view of the sleeve and the sleeve mounting ring in a combined state;

[0077] Fig. 18 is a top view of the sleeve and the sleeve mounting ring in a combined state;

[0078] FIG19 is a cross-sectional view taken along line FF in FIG18 ;

[0079] FIG20 is a schematic diagram of the connection state of the sleeve, the oil mist branch line, the oil mist main line, the diverter and the oil mist generator;

[0080] FIG21 is a perspective view of the horizontal adjustment device and the column in a separated state;

[0081] FIG22 is a perspective view of the exploded state of the level adjustment device;

[0082] Fig. 23 is a front view of the level adjustment device;

[0083] FIG. 24 is a graph showing experimental data of a test device using a lightweight honeycomb material for buffering and energy absorption.

[0084] In the figure, 1, bottom plate; 101, slide bar mounting groove; 102, circular notch; 2, column; 201, end connection hole; 3, top plate; 4, sample support; 5, lightweight honeycomb material; 6, slide bar; 7, mounting plate; 701, upper mounting plate; 7011, countersunk hole; 7012, threaded hole; 702, lower mounting plate; 8, impact head; 9, drive motor; 10, transmission housing; 11, screw rod; 12, electromagnet; 13, iron plate; 14, threaded connection column; 15, sleeve; 1501, threaded groove; 1502, air inlet; 1503, pipeline connection part; 1504, air outlet; 16, oil mist gas branch pipeline; 1601, left oil mist gas branch pipeline; 1602, right oil mist gas branch pipeline; 17, diverter; 18, oil mist gas main pipeline ;19. Oil mist generator;20. Load sensor;21. First bracket;22. Laser displacement sensor;23. Second bracket;24. Laser speed sensor;25. Weighing sensor;26. Sleeve mounting ring;27. Weight mounting rod;28. Weight;29. Fastening nut;30. Steel ball placement tube;31. Steel ball;32. Steel ball limit cover;33. Handle;34. Tool insertion slot;35. Steel ball placement tube fixing column;3501. Screw blind hole;36. Level bubble meter;37. Level adjustment device;3701. Base;3702. Ball slot;3703. Leg body;3704. Rotating ball;3705. Screw;3706. Adjusting nut;3707. Connecting plate;3708. Connecting nut;38. Screw. DETAILED DESCRIPTION

[0085] The specific implementation of the present invention is described in detail below with reference to Figures 1 to 24.

[0086] As shown in Figures 1 to 4, the detection equipment for light honeycomb material buffering and energy absorption includes a frame, a lifting part, an impact head 8 and a controller. The frame includes a bottom plate 1, columns 2 arranged at the four corners of the bottom plate 1 and a top plate 3 arranged at the top of the column 2. A sample support 4 is arranged at the center of the bottom plate 1, and the interior of the cylinder of the sample support 4 is used to place a light honeycomb material 5. Slide rods 6 are arranged symmetrically between the bottom plate 1 and the top plate 3 about the sample support 4. A slide rod installation groove 101 for installing the slide rod 6 is opened on the bottom plate 1, and the lower end of the slide rod 6 is inserted into the slide rod installation groove 101.

[0087] The lifting part includes a mounting plate 7 sliding on the slide bar 6 and a device for driving the mounting plate 7 to lift and lower. The impact head 8 is arranged at the lower part of the mounting plate 7, and the impact head 8 corresponds to the sample support 4 up and down. The device for driving the mounting plate 7 to lift and lower includes a driving motor 9 above the top plate 3 and a transmission housing 10 located at the center of the upper surface of the top plate 3. The driving motor 9 is electrically connected to the controller. Two mutually vertically meshed bevel gears are arranged in the transmission housing 10. The output shaft of the driving motor 9 is connected to one of the bevel gears, and the other bevel gear is connected to a screw rod 11. The screw rod 11 is connected to the driving motor 9 through the bevel gear. Through holes are provided at the top of the transmission housing 10 and the center of the top plate 3. The through holes of the transmission housing 10 and the top plate 3 are respectively connected to the screw rod 11 for sliding. The driving motor 9 is operated to drive the bevel gear to rotate, thereby driving the screw rod 11 to rise or move downward, thereby adjusting the height of the mounting plate 7. The device for driving the mounting plate 7 to lift and lower can also be replaced by other mechanisms or devices in the prior art that can lift, lower or stop the mounting plate 7, such as installing a winch on the top plate 3.

[0088] A mounting plate release device is installed under the device for driving the mounting plate 7 to control the fixing and loosening of the mounting plate 7. As shown in FIG5, the mounting plate release device can be an electromagnet 12, which is electrically connected to the controller. An iron plate 13 is provided at the center position of the mounting plate 7. As shown in FIG6, a threaded connection column 14 is provided at the bottom center position of the iron plate 13. A threaded hole 7012 matching the threaded connection column 14 is provided in the middle of the mounting plate 7, and the threaded connection column 14 is connected to the threaded hole 7012. When the electromagnet 12 is powered on, the electromagnet 12 and the iron plate 13 are attracted to each other, and the electromagnet 12 is fixedly connected to the mounting plate 7; when the electromagnet 12 is powered off, the electromagnet 12 is disconnected from the iron plate 13, and the electromagnet 12 loses its fixing effect on the mounting plate 7, and the mounting plate 7 drives the impact head 8 to fall freely, so as to impact the lightweight honeycomb material 5. The mounting plate release device can also be a clamp, which is electrically connected to the controller to realize the clamping and loosening of the mounting plate 7 by the clamp. When the mounting plate releasing device is fixed to the mounting plate 7, the device driving the mounting plate 7 to rise and fall drives the mounting plate 7 and the impact head 8 to rise or fall synchronously; when the mounting plate releasing device is released from the mounting plate 7, the mounting plate 7 and the impact head 8 fall freely.

[0089] The mounting plate 7 and the slide bar 6 are slidably connected via a sleeve 15 . The sleeve 15 is fixedly disposed at both ends of the mounting plate 7 , and a gap is provided between the sleeve 15 and the slide bar 6 . The structure of the sleeve 15 is shown in Figures 17 to 19. A threaded groove 1501 is axially provided inside the sleeve 15; three air outlets 1504 parallel to the axial direction of the sleeve 15 are circumferentially provided at the top of the sleeve 15, and the air outlets 1504 are parallel to the axial direction of the slide rod 6, and the air outlets 1504 are connected to the upper ends of the threaded grooves 1501; an air inlet 1502 is provided on the side wall of the lower end of the sleeve 15, and the air inlet 1502 is communicated with the lower end of the threaded groove 1501, and a pipeline connecting portion 1503 is provided outside the air inlet 1502, and the pipeline connecting portion 1503 is connected to one end of the oil mist branch pipeline 16, and the other end of the oil mist branch pipeline 16 is connected to the oil mist main pipeline 18 through the diverter 17, and the other end of the oil mist main pipeline 18 is connected to the oil mist generator 19, and the oil mist generator 19 is electrically connected to the controller, as shown in Figure 20. The high-pressure oil mist generated in the oil mist generator 19 is passed through the oil mist main pipeline 18 and the oil mist branch pipeline 16 to the sleeve 15, and the oil mist is input from the air inlet 1502 of the thread groove 1501 in the sleeve 15 and sprayed out through the air outlet 1504. The oil mist is passed into the thread groove 1501 of the sleeve 15 to reduce the friction between the sleeve 15 and the slide bar 6, and the mounting plate 7 and the impact head 8 fall freely. In order to maintain the air flow balance at the left and right ends of the mounting plate 7, the oil mist branch pipeline 16 includes a left oil mist branch pipeline 1601 and a right oil mist branch pipeline 1602, which correspond to the pipeline connection parts 1503 of the sleeve 15 connected to the left and right ends of the mounting plate 7, and the lengths of the left oil mist branch pipeline 1601 and the right oil mist branch pipeline 1602 are consistent, as shown in Figure 20.

[0090] The oil mist generator 19 is a prior art, and its specific structure may be an oil-gas lubricator consisting of an oil-gas supplier and an atomizer disclosed in CN115060615A.

[0091] The air outlet 1504 is parallel to the axis of the slide rod 6, ensuring that the oil mist is sprayed along the direction of the slide rod 6, and the sleeve 15 slides along the slide rod 6 without deviation; the oil mist is between the sleeve 15 and the slide rod 6, which can reduce the influence of the friction of the slide rail on the buffering energy absorption test of the lightweight honeycomb material 5; at the same time, the upward jet force of the oil mist pushes the impact head 8, compensates for the friction between the sleeve 15 and the slide rod 6, realizes the free fall motion of the impact head 8, and improves the accuracy of the test results.

[0092] A load sensor 20 is provided on the inner bottom surface of the sample support 4, and the bottom of the lightweight honeycomb material 5 contacts the load sensor 20. The lightweight honeycomb material 5 to be tested is subjected to the impact force from the impact head 8, and the impact force is transmitted to the load sensor 20, and the detected impact force data is transmitted to the dynamic data analyzer. The load sensor 20 can be a load sensor 20 of model LC-20TV of Kyowa Electric (Shanghai) Trading Co., Ltd., or a model specification KD3020C of Yangzhou Kedong Electronics Co., Ltd., with a maximum load of 200kN, an accuracy of 1%, and a resonant frequency of 50kHz.

[0093] A first bracket 21 is provided on the bottom plate 1, and a laser displacement sensor 22 is provided on the first bracket 21. The laser displacement sensor 22 detects the position of the mounting plate 7, the height of the free fall of the mounting plate 7, and is also used to detect the deformation of the lightweight honeycomb material 5 to be impacted, and transmits the detected displacement data to the dynamic data analyzer. The laser displacement sensor 22 can be a laser displacement sensor 22 of model HL-C235CE-WMK of Panasonic Electric Electromechanical (China) Co., Ltd., with a measurement center distance of 300mm, a measurement area of ​​±200mm, an accuracy of 8μm (at 40kHz), and a sampling period of 10μs~2ms.

[0094] A second bracket 23 is provided on the bottom plate 1, and a laser speed sensor 24 is provided on the second bracket 23. The laser speed sensor 24 detects the moving speed of the impact head 8, and can detect the speed at the moment when the impact head 8 contacts the lightweight honeycomb material 5 to be tested, and transmits the detected speed data to the dynamic data analyzer. The laser speed sensor 24 can be a compact laser Doppler velocimeter of Smart LDV III of Kanomax.

[0095] A weighing sensor 25 is arranged between the device for driving the mounting plate 7 to rise and fall and the mounting plate releasing device. The weighing sensor 25 can detect the weight of the mounting plate 7, the weight 28 and the steel ball 31, and transmit the detected weight data to the dynamic data analyzer. The weighing sensor 25 can use NerlBo's S-type weighing sensor with model DSSM-S302.

[0096] The impact force data, displacement data, velocity data and counterweight data from the dynamic data analyzer are transmitted to the computer for further analysis of the test data.

[0097] Specifically, as shown in FIG16 , a circular notch 102 is provided at the center of the base plate 1. The diameter of the circular notch 102 is the same as the outer diameter of the sample holder 4. The sample holder 4 is clamped in the circular notch 102. As shown in FIG15 , the position of the sample holder 4 can be fixed during the impact process, thereby avoiding the influence of the movement of the sample holder 4 on the test results.

[0098] Specifically, a sleeve mounting ring 26 is provided at the top of the sleeve 15 , the sleeve 15 and the sleeve mounting ring 26 are integrally formed, screw holes are provided on the sleeve mounting ring 26 and the mounting plate 7 , and the sleeve mounting ring 26 and the mounting plate 7 are connected by screws 38 .

[0099] Specifically, as shown in FIG. 5 and FIG. 7 , the mounting plate 7 includes an upper mounting plate 701 and a lower mounting plate 702. The sleeves 15 at the left and right ends of the upper mounting plate 701 and the lower mounting plate 702 are respectively connected to the left oil mist branch pipeline 1601 and the right oil mist branch pipeline 1602. An iron plate 13 is provided at the center position of the upper surface of the upper mounting plate 701, and the impact head 8 is provided at the lower center position of the lower mounting plate 702. The weight mounting rod 27 is symmetrically arranged between the upper mounting plate 701 and the lower mounting plate 702 about the sample support 4. Each weight mounting rod 27 is movably provided with at least one weight 28 of the same number, and a fastening nut 29 is provided on the top of the top weight 28 to fix the weight 28 on the weight mounting rod 27. A steel ball placement cylinder 30 is movably provided at the center of the lower surface of the upper mounting plate 701. A steel ball 31 is placed in the steel ball placement cylinder 30. The diameter of the steel ball 31 can be selected from 1mm to 4mm. The inner wall of the steel ball placement cylinder 30 is provided with an internal thread. A steel ball limiting cover 32 is provided inside the steel ball placement cylinder 30. The circumferential side of the steel ball limiting cover 32 is provided with an external thread that matches the internal thread of the steel ball placement cylinder 30. The steel ball placement cylinder 30 is threadedly connected with the steel ball limiting cover 32. The steel ball limiting cover 32 is located at the top of the steel ball 31 filled inside the steel ball placement cylinder 30. As shown in FIG12, when the steel ball placement cylinder 30 is freely falling, the steel ball limiting cover 32 can press the steel ball 31 to prevent the steel ball 31 from being in a weightless state. Changing the number of weights 28 can achieve a rough adjustment of the counterweight, and the number of steel balls 31 placed in the steel ball placement cylinder 30 can achieve a fine adjustment of the counterweight.

[0100] In order to facilitate the adjustment of the position of the steel ball limiting cover 32 on the steel ball placing tube 30, an auxiliary mounting portion is provided on the upper surface of the steel ball limiting cover 32. The auxiliary mounting portion can be a handle 33 fixed on the upper surface of the steel ball limiting cover 32, as shown in FIG9, the handle 33 and the steel ball limiting cover 32 can be integrally formed and connected, during use, the operator rotates the handle 33 to make the steel ball limiting cover 32 abut against the steel ball 31 to achieve the fixation of the steel ball 31 in the steel ball placing tube 30. The auxiliary mounting portion can also be a tool insertion groove 34 at the center position of the upper surface of the steel ball limiting cover 32, as shown in FIG10, during use, the operator inserts one end of the tool into the tool insertion groove 34, rotates the tool, and makes the steel ball limiting cover 32 abut against the steel ball 31 to achieve the fixation of the steel ball 31 in the steel ball placing tube 30.

[0101] Further, as shown in Fig. 7 and Fig. 8, a steel ball placement tube fixing column 35 is provided at the center of the lower surface of the upper mounting plate 701, a blind screw hole 3501 is provided at the upper portion of the steel ball placement tube fixing column 35, a countersunk hole 7011 corresponding to the blind screw hole 3501 is provided on the upper mounting plate 701, the steel ball placement tube fixing column 35 is fixedly connected to the upper mounting plate 701 by means of a screw 38, an external thread matching the internal thread of the steel ball placement tube 30 is provided on the circumferential surface of the steel ball placement tube fixing column 35, and the steel ball placement tube 30 is threadedly connected to the steel ball placement tube fixing column 35. The operator screws the steel ball placement tube 30 equipped with the steel ball 31 onto the steel ball placement tube fixing column 35, which is convenient for installation, and the connection between the steel ball placement tube 30 and the upper mounting plate 701 is stable, and it is also convenient for the steel ball placement tube 30 to be removed from the steel ball placement tube fixing column 35.

[0102] In order to keep the slide bar 6 in a vertical state, avoid the sleeve 15 of the mounting plate 7 from colliding with the slide bar 6 during the free fall process, and ensure the smooth progress of the test, a horizontal adjustment device 37 is provided at the bottom end of the column 2, and a horizontal bubble meter 36 is provided on the upper surface of the bottom plate 1, as shown in Figures 1 and 2. A structure of the horizontal adjustment device 37 is shown in Figures 22 and 23. The horizontal adjustment device 37 includes a base 3701, a leg body 3703 movably connected to the base 3701, and a connecting plate 3707 threadedly connected to the leg body 3703. The leg body 3703 includes a rotating ball 3704, a screw 3705 on the rotating ball 3704, and an adjusting nut 3706 between the rotating ball 3704 and the screw 3705. The rotating ball 3704, the screw 3705 and the adjusting nut 3706 are fixedly connected. A ball groove 3702 is provided on the upper part of the base 3701, and a rotating ball 3704 of the leg body 3703 is arranged in the ball groove 3702. A round hole matching the screw rod 3705 is provided in the middle of the connecting plate 3707. A connecting nut 3708 is fixedly provided on the lower surface of the connecting plate 3707. The connecting plate 3707 and the connecting nut 3708 can be fixed by welding. The connecting nut 3708 under the connecting plate 3707 is threadedly connected with the screw rod 3705 of the leg body 3703. The connecting plate 3707 is fixed to the bottom end of the column 2 by a screw 38. An end connecting hole 201 is provided at the bottom end of the column 2. As shown in FIG. 21, the diameter of the end connecting hole 201 is larger than the diameter of the screw rod 3705, and the screw rod 3705 of the leg body 3703 is passed through the end connecting hole 201. By screwing the adjusting nut 3706 of the leg body 3703, the screw rod 3705 is driven to rotate, thereby realizing the up and down movement of the connecting plate 3707, thereby adjusting the height of the column 2, and observing whether the bubble in the horizontal bubble meter 36 is in the middle position to determine whether the detection device for light honeycomb material buffering and energy absorption is in a horizontal state, so as to avoid the sleeve 15 and the slide bar 6 from colliding during the free fall of the mounting plate 7. The horizontal adjustment device 37 can also be the related technology disclosed in the Chinese patent CN209671949U, or other existing known technologies, as long as it can realize the horizontal adjustment of the detection device for light honeycomb material buffering and energy absorption.

[0103] The above-mentioned dynamic data analyzer can use the DH5922D dynamic signal test and analysis system of Jiangsu Donghua Testing Technology Co., Ltd., whose acquisition frequency is 100kHz, meeting the requirements of data processing.

[0104] The detection equipment for light honeycomb material buffering and energy absorption of the present invention can realize the automation process of lifting the impact head 8 and impacting, greatly improving the work efficiency and operation safety; by spraying oil mist between the sleeve 15 and the slide bar 6, the friction between the sleeve 15 and the slide bar 6 is reduced, and the accuracy of the test results is improved; the counterweight can be accurately adjusted, further improving the accuracy of the test results. During the impact process, through the laser speed sensor 24, the laser displacement sensor 22, and the load sensor 20, dynamic mechanical data such as impact velocity, compression deformation, and impact load can be accurately obtained from the test, thereby clearly reflecting the impact resistance of the light honeycomb material 5, and analyzing the reliability of its function and the integrity of its structure.

[0105] The method for evaluating the lightweight honeycomb material 5 using the aforementioned lightweight honeycomb material buffering and energy absorption detection equipment comprises the following steps:

[0106] S1, measuring the sample heights of at least three locations of the lightweight honeycomb material 5 to be tested, and calculating the average height h1 before impact;

[0107] S2, placing the lightweight honeycomb material 5 to be tested into the sample support 4;

[0108] S3, adjusting the device of the lifting part driving the mounting plate 7 to move the mounting plate 7 along the slide bar 6 to the required height;

[0109] S4, the controller controls the mounting plate release device to make the mounting plate 7 drive the impact head 8 to freely drop, and at the same time the controller controls the oil mist generator 19 to spray the oil mist with a preset flow rate and a preset mixing ratio into the sleeve 15;

[0110] S5, the impact head 8 impacts the lightweight honeycomb material 5 to be tested, and the dynamic data analyzer obtains the real-time data of the compression deformation ε of the laser displacement sensor 22 and the impact load F of the load sensor 20;

[0111] S6, adjusting the device for driving the mounting plate 7 of the lifting part to lift the impact head 8 to be away from the lightweight honeycomb material 5, taking out the lightweight honeycomb material 5 after impact, measuring the height of the lightweight honeycomb material 5 after impact, keeping the measuring position consistent with that before the test, and calculating the average height h2 after impact;

[0112] S7, exporting the real-time data of the compression deformation ε and the impact load F to the computer;

[0113] S8, fitting the impact load F and the compression deformation ε to obtain an impact load F-compression deformation ε curve, the impact load F-compression deformation ε curve is shown in FIG24;

[0114] The instantaneous maximum force F1 of the impact head 8 contacting the lightweight honeycomb material 5 to be tested and its corresponding compression deformation ε1 (the impact load F and compression deformation ε corresponding to the position of point O in FIG24 ), the stable load F2 at the inflection point of the impact material load being in a stable state and its corresponding compression deformation ε2 (the impact load F and compression deformation ε corresponding to the position of point P in FIG24 ) are analyzed, and the energy absorption response sensitivity K is used to evaluate the energy absorption speed of the lightweight honeycomb material 5, and the calculation formula is as follows:

[0115] ;

[0116] The compression deformation ε3 corresponding to the lightweight honeycomb material 5 in the compacted state (the impact load F and the compression deformation ε corresponding to the Q point position in FIG. 24 ) is analyzed, and the energy absorption stability R is used to evaluate the energy absorption stability of the lightweight honeycomb material 5 , and the calculation formula is as follows:

[0117] ;

[0118] The closer R is to 1, the more stable the energy absorption process of the lightweight honeycomb material 5 is;

[0119] The compression rate S is used to evaluate the impact resistance of the lightweight honeycomb material 5, and the calculation formula is as follows:

[0120] ;

[0121] The smaller S is, the better the performance of the lightweight honeycomb material 5 in resisting impact is.

[0122] The terms "vertical", "horizontal", "left", "right", "upper", "lower" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0123] The above description is only an illustrative specific implementation manner of the present invention. Without departing from the concept and principle of the present invention, any equivalent changes and modifications made by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A light honeycomb material buffering and energy absorption detection device, comprising a frame, a lifting part, an impact head (8) and a controller; The frame comprises a bottom plate (1), upright posts (2) arranged at four corners of the bottom plate (1), and a top plate (3) arranged at the top ends of the upright posts (2); A sample support (4) is arranged at the center of the bottom plate (1), and a light honeycomb material (5) is placed inside the cylinder of the sample support (4); A sliding rod (6) is symmetrically arranged between the bottom plate (1) and the top plate (3) with respect to the sample support (4); The lifting part comprises a mounting plate (7) sliding on the slide rod (6) and a device for driving the mounting plate (7) to lift and lower. The impact head (8) is arranged at the lower part of the mounting plate (7). The impact head (8) corresponds to the sample support (4) in the upper and lower parts. A mounting plate release device is installed below the device for driving the mounting plate (7) to lift and lower, so as to control the fixing and releasing of the mounting plate (7); It is characterized in that The mounting plate (7) and the slide bar (6) are slidably connected via a sleeve (15), the sleeve (15) being fixedly arranged at both ends of the mounting plate (7), with a gap between the sleeve (15) and the slide bar (6); A thread groove (1501) is provided in the axial direction inside the sleeve (15); an air inlet (1502) is provided on the side wall of the lower end of the sleeve (15), the air inlet (1502) is communicated with the lower end of the thread groove (1501), a pipeline connecting portion (1503) is provided outside the air inlet (1502), the pipeline connecting portion (1503) is connected to one end of the oil mist gas branch pipeline (16), and the other end of the oil mist gas branch pipeline (16) is connected to the oil mist gas branch pipeline (16) through the diverter (1 7) connected to an oil mist main line (18), the other end of the oil mist main line (18) is connected to an oil mist generator (19), the oil mist generator (19) is electrically connected to a controller, the top end of the sleeve (15) is provided with three air outlets (1504) parallel to the axial direction of the sleeve (15) along the circumference, the air outlets (1504) are parallel to the axial direction of the slide rod (6), and the air outlets (1504) are connected to the upper end of the threaded groove (1501); The oil mist gas branch pipeline (16) comprises a left oil mist gas branch pipeline (1601) and a right oil mist gas branch pipeline (1602), which respectively correspond to the pipeline connection parts (1503) of the sleeve (15) connected to the left and right ends of the mounting plate (7), and the left oil mist gas branch pipeline (1601) and the right oil mist gas branch pipeline (1602) have the same length; A load sensor (20) is arranged on the inner bottom surface of the sample support (4), and the bottom of the lightweight honeycomb material (5) is in contact with the load sensor (20); A first bracket (21) is arranged on the bottom plate (1), and a laser displacement sensor (22) is arranged on the first bracket (21); A second bracket (23) is arranged on the bottom plate (1), and a laser speed sensor (24) is arranged on the second bracket (23).

2. The detection device for light honeycomb material buffering and energy absorption according to claim 1, characterized in that: The mounting plate (7) comprises an upper mounting plate (701) and a lower mounting plate (702), and the sleeves (15) at the left and right ends of the upper mounting plate (701) and the lower mounting plate (702) are respectively connected to a left oil mist gas branch pipeline (1601) and a right oil mist gas branch pipeline (1602); A weight mounting rod (27) is disposed symmetrically between the upper mounting plate (701) and the lower mounting plate (702) about the sample support (4), each weight mounting rod (27) being movably provided with at least one weight (28) of the same number, and a fastening nut (29) is disposed on the top of the uppermost weight (28); A steel ball placement cylinder (30) is movably provided at the center position of the lower surface of the upper mounting plate (701), a steel ball (31) is placed in the steel ball placement cylinder (30), an inner wall of the steel ball placement cylinder (30) is provided with an internal thread, a steel ball limiting cover (32) is provided inside the steel ball placement cylinder (30), an external thread matching the internal thread of the steel ball placement cylinder (30) is provided on the circumferential side surface of the steel ball limiting cover (32), and the steel ball placement cylinder (30) is threadedly connected to the steel ball limiting cover (32); The impact head (8) is arranged at the lower center position of the lower mounting plate (702); An auxiliary mounting portion is provided on the upper surface of the steel ball limiting cover (32).

3. The detection device for light honeycomb material buffering and energy absorption according to claim 2, characterized in that: A steel ball placement tube fixing column (35) is arranged at the center position of the lower surface of the upper mounting plate (701); a blind screw hole (3501) is provided on the upper portion of the steel ball placement tube fixing column (35); a countersunk hole (7011) corresponding to the blind screw hole (3501) is provided on the upper mounting plate (701); the steel ball placement tube fixing column (35) is fixedly connected to the upper mounting plate (701) by means of a screw (38); an external thread matching the internal thread of the steel ball placement tube (30) is arranged on the circumferential surface of the steel ball placement tube fixing column (35); the steel ball placement tube (30) is threadedly connected to the steel ball placement tube fixing column (35).

4. The detection device for light honeycomb material buffering and energy absorption according to claim 1, characterized in that: The device for driving the mounting plate (7) to rise and fall comprises a driving motor (9) above the top plate (3) and a transmission housing (10) located at the center of the upper surface of the top plate (3); the driving motor (9) is electrically connected to a controller; Two mutually perpendicularly meshing bevel gears are arranged in the transmission housing (10); the output shaft of the drive motor (9) is connected to one of the bevel gears; the other bevel gear is connected to a lead screw (11); and the lead screw (11) is connected to the drive motor (9) via the lead screw; Through holes are provided through the top of the transmission housing (10) and the center of the top plate (3), and the through holes of the transmission housing (10) and the top plate (3) are respectively slidably connected to the screw rod (11).

5. The detection device for light honeycomb material buffering and energy absorption according to claim 1, characterized in that: The mounting plate release device is an electromagnet (12), and the electromagnet (12) is electrically connected to the controller; An iron plate (13) is arranged at the center position on the mounting plate (7), a threaded connection column (14) is arranged at the center position of the bottom of the iron plate (13), a threaded hole (7012) matching with the threaded connection column (14) is arranged in the middle of the mounting plate (7), and the threaded connection column (14) is connected to the threaded hole (7012); When the electromagnet (12) is in a powered-on state, the electromagnet (12) and the iron plate (13) attract each other; when the electromagnet (12) is in a powered-off state, the electromagnet (12) and the iron plate (13) are disconnected.

6. The detection device for light honeycomb material buffering and energy absorption according to claim 1, characterized in that: A weighing sensor (25) is arranged between the device for driving the mounting plate (7) to rise and fall and the mounting plate releasing device, and the weighing sensor (25) detects the weight of the mounting plate (7), the weight (28) and the steel ball (31).

7. The detection device for light honeycomb material buffering and energy absorption according to claim 1, characterized in that: A sleeve mounting ring (26) is provided at the top end of the sleeve (15), screw holes are provided on the sleeve mounting ring (26) and the mounting plate (7), and the sleeve mounting ring (26) and the mounting plate (7) are connected by screws (38).

8. The detection device for light honeycomb material buffering and energy absorption according to claim 1, characterized in that: A level adjustment device (37) is provided at the bottom end of the column (2), and a level bubble meter (36) is provided on the upper surface of the bottom plate (1).

9. The detection device for light honeycomb material buffering and energy absorption according to claim 8, characterized in that: The horizontal adjustment device (37) comprises a base (3701), a leg body (3703) movably connected to the base (3701), and a connecting plate (3707) threadedly connected to the leg body (3703); The leg body (3703) comprises a rotating ball (3704), a screw rod (3705) on the rotating ball (3704), and an adjusting nut (3706) between the rotating ball (3704) and the screw rod (3705), wherein the rotating ball (3704), the screw rod (3705) and the adjusting nut (3706) are fixedly connected; A ball groove (3702) is provided at the upper portion of the base (3701), and a rotating ball (3704) of the leg body (3703) is arranged in the ball groove (3702). A circular hole matching the screw rod (3705) is provided in the middle of the connecting plate (3707), and a connecting nut (3708) is fixedly provided on the lower surface of the connecting plate (3707). The connecting nut (3708) below the connecting plate (3707) is threadedly connected to the screw rod (3705) of the leg body (3703). The connecting plate (3707) is fixedly provided at the bottom end of the column (2) by means of a screw (38). An end connecting hole (201) is provided at the bottom end of the column (2), and the screw rod (3705) of the leg body (3703) is inserted into the end connecting hole (201).

10. A method for evaluating lightweight honeycomb materials using the detection device for buffering and energy absorption of lightweight honeycomb materials according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, measuring the sample heights of at least three locations of the lightweight honeycomb material (5) to be tested, and calculating the average value h1 of the heights before impact; S2, placing the lightweight honeycomb material (5) to be tested into the sample support (4); S3, a device for adjusting the lifting and lowering of the driving mounting plate (7) of the lifting part, moving the mounting plate (7) along the slide bar (6) to a required height; S4, the controller controls the mounting plate release device to make the mounting plate (7) drive the impact head (8) to freely descend, and at the same time the controller controls the oil mist generator (19) to spray oil mist with a preset flow rate and a preset mixing ratio into the sleeve (15); S5, the impact head (8) impacts the lightweight honeycomb material (5) to be tested, and the dynamic data analyzer obtains real-time data of the compression deformation ε of the laser displacement sensor (22) and the impact load F of the load sensor (20); S6, adjusting the device for lifting the driving mounting plate (7) of the lifting part, lifting the impact head (8) to be away from the lightweight honeycomb material (5), taking out the lightweight honeycomb material (5) after impact, measuring the height of the lightweight honeycomb material (5) after impact, keeping the measuring position consistent with that before the test, and calculating the average value h2 of the height after impact; S7, exporting the real-time data of the compression deformation ε and the impact load F to the computer; S8, fitting the impact load F and the compression deformation ε to obtain an impact load F-compression deformation ε curve; The instantaneous maximum force F1 of the impact head (8) contacting the light honeycomb material (5) to be tested and its corresponding compression deformation ε1, the stable load F2 of the impact material load at the inflection point of the stable state and its corresponding compression deformation ε2 are analyzed, and the energy absorption response sensitivity K is used to evaluate the energy absorption speed of the light honeycomb material (5), and the calculation formula is as follows: ； The compression deformation ε3 corresponding to the lightweight honeycomb material (5) in a compacted state is analyzed, and the energy absorption stability R is used to evaluate the energy absorption stability of the lightweight honeycomb material (5). The calculation formula is as follows: ； The closer R is to 1, the more stable the energy absorption process of the lightweight honeycomb material (5); The compression rate S is used to evaluate the impact resistance of the lightweight honeycomb material (5), and the calculation formula is as follows: ； The smaller S is, the better the impact resistance of the lightweight honeycomb material (5) is.

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