Device and method for testing energy absorption performance of energy absorption pipe based on drop hammer

Abstract

The invention discloses an energy absorption performance testing device and method for an energy absorption pipe based on a drop hammer, and belongs to the technical field of mechanical property testing, and the device comprises a mounting frame, a hammer body assembly, a first sensor, a second sensor, a mounting seat, a guide rod, an impact head, a lifting mechanism and a control system, a vertically extending guide rail and a mounting base top end face perpendicular to the guide rail are arranged on a mounting frame, so that a hammer body assembly in sliding connection with the guide rail can vertically impact an impact head and an energy absorption pipe which are located on the top end face of the mounting base after being lifted by a lifting mechanism; compression deformation of the energy absorption pipe in the impact process is guided through a guide rod penetrating through the energy absorption pipe and a first through hole which is in clearance fit with the guide rod and extends in the vertical direction in the installation base. A first sensor is arranged on the hammer body assembly to measure the real-time acceleration of the hammer body assembly, a second sensor is arranged between the installation base and the installation frame to measure the real-time impact force in the impact process, and then the control system can record acceleration changes and impact force changes in the impact process.

Description

Technical Field

[0001] This invention belongs to the field of mechanical performance testing technology, specifically relating to a test device and method for the energy absorption performance of a drop hammer-based energy-absorbing tube. Background Technology

[0002] Impact collisions are a common mechanical phenomenon in daily life and engineering applications. To avoid or reduce the impact of impact collisions, energy-absorbing tubes are used for cushioning in certain scenarios or mechanical structures. For example, some braking devices are equipped with energy-absorbing tubes, and there are relatively strict requirements for the energy absorption capacity and compression shape of the energy-absorbing tubes. This requires verifying the energy absorption effect and compression shape of the energy-absorbing tubes under specific speeds and impact energies. Due to considerations of time, manufacturing, cost, and safety, the braking performance and deformation shape of energy-absorbing tubes cannot be directly tested using the product; specialized testing equipment is required. Summary of the Invention

[0003] In response to one or more of the above-mentioned defects or improvement needs of the existing technology, the present invention provides a test device and method for the energy absorption performance of an energy-absorbing tube based on a falling weight. It can accurately simulate the compression process of the energy-absorbing tube on the braking device to verify the buffer energy absorption capacity of the energy-absorbing tube. It is easy to assemble and disassemble and has high test efficiency.

[0004] To achieve the above objectives, the present invention provides a test device for the energy absorption performance of a falling weight-based energy-absorbing tube, comprising: Mounting bracket, wherein the mounting bracket is provided with a guide rail extending vertically; A hammer assembly, wherein the hammer assembly is slidably connected to the track; The detection component includes a first sensor and a second sensor; the first sensor is mounted on the hammer assembly and is used to measure the acceleration of the hammer assembly in real time during the test; the second sensor is mounted on the mounting bracket located on one side of the guide rail and its top surface is perpendicular to the guide rod, and is used to measure the impact force received during the test in real time. The mounting assembly includes a mounting base, a guide rod, and an impact head; the mounting base is detachably connected to the second sensor, the top surface of the mounting base is perpendicular to the guide rail, and the mounting base has a through hole that connects to its top surface and extends vertically, the through hole includes a first through hole located above and a second through hole located below, the projection area of ​​the second through hole in the horizontal plane includes the projection area of ​​the first through hole in the horizontal plane; The bottom end of the guide rod can extend into the first through hole, and the top end of the guide rod is threadedly connected to the impact head, so that the guide rod located between the impact head and the top surface of the mounting base forms a mounting position for the energy-absorbing tube; the impact head is used to receive the falling hammer assembly; the length of the guide rod is not greater than the length of the first through hole, the guide rod is clearance-fitted with the first through hole, and can move along the first through hole to provide guidance for the compression deformation of the energy-absorbing tube sleeved on the outside of the guide rod; A lifting mechanism for lifting and releasing the hammer assembly; The control system is electrically connected to the first sensor and the second sensor to record changes in acceleration and impact force during the impact process.

[0005] As a further improvement of the present invention, a base is provided between the second sensor and the mounting bracket, the base is perpendicular to the guide rail, the base is fixedly connected to the mounting bracket, and the second sensor is mounted on the base.

[0006] As a further improvement of the present invention, the mounting base includes a base plate, a support assembly and a guide plate. The base plate is detachably connected to the second sensor, the support assembly is detachably connected to the base plate, the support assembly is provided with two parallel and spaced guide grooves, the two sides of the guide plate are slidably connected to the two guide grooves respectively, the top surface of the guide plate is perpendicular to the guide rail, and the first through hole is provided on the guide plate.

[0007] As a further improvement of the present invention, the guide plate is provided with weight reduction holes.

[0008] As a further improvement of the present invention, a guide tube is installed in the middle of the guide plate, and the first through hole is located entirely or partially inside the guide tube.

[0009] As a further improvement of the present invention, the hammer assembly includes a slider, a counterweight, and a connector. The slider is slidably connected to the guide rail, and one side of the connector is threadedly connected to the slider, while the other side is threadedly connected to the counterweight.

[0010] As a further improvement of the present invention, the counterweight is made of steel and the lifting mechanism is a permanent magnet lifter.

[0011] As a further improvement of the present invention, the base is welded to the mounting bracket; And / or, The guide rail is connected to the mounting frame via a channel steel, the channel steel is welded to the mounting frame, and the guide rail is bolted to the channel steel; And / or, The mounting frame is assembled and welded from multiple channel steels and multiple square tubes.

[0012] As a further improvement of the present invention, the second sensor is a pressure sensor, the second sensor is bolted to the base, and the second sensor is connected to the mounting base through a connecting flange.

[0013] On the other hand, the present invention also provides a method for testing the energy absorption performance of a drop-weight-based energy-absorbing tube, which utilizes the aforementioned drop-weight-based energy-absorbing tube energy absorption performance testing device and includes the following steps: Install the energy-absorbing tube in the mounting position; The lifting mechanism raises the hammer assembly to the required height for the test; The lifting mechanism releases the hammer assembly and simultaneously activates the first and second sensors, as well as the control system. The hammer assembly falls vertically and impacts the impact head and energy-absorbing tube. The control system records the changes in acceleration and impact force during the impact process.

[0014] The aforementioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0015] In summary, the beneficial effects of the above-described technical solutions conceived by this invention compared with the prior art include: (1) The energy absorption performance test device of the energy-absorbing tube based on the falling hammer of the present invention includes a mounting frame, a hammer assembly, a first sensor, a second sensor, a mounting base, a guide rod, an impact head, a lifting mechanism and a control system. By setting a vertically extending guide rail on the mounting frame and a top surface of the mounting base perpendicular to the guide rail, the hammer assembly, which is slidably connected to the guide rail, can be lifted by the lifting mechanism and vertically impact the impact head and the energy-absorbing tube located on the top surface of the mounting base. Furthermore, the guide rod passing through the energy-absorbing tube and the first through hole in the mounting base that is clearance-fitted with the guide rod and extends vertically guide the compression deformation of the energy-absorbing tube during the impact, so as to prevent the energy-absorbing tube from getting stuck and eccentric when it undergoes compression deformation. Then, a first sensor is set on the hammer assembly to measure the real-time acceleration of the hammer assembly, and a second sensor is set between the mounting base and the mounting frame to measure the real-time impact force during the impact process. The control system records the acceleration change and impact force change during the impact process. The energy absorption performance testing device for a drop hammer-based energy-absorbing tube of the present invention ensures that the hammer assembly can vertically impact the energy-absorbing tube standing on the top surface of the mounting base by setting a vertically extending guide rail and a mounting base top surface perpendicular to the guide rail. Furthermore, the clearance fit between the guide rod inserted in the energy-absorbing tube and the vertically extending first through hole ensures that the energy-absorbing tube will not jam or become eccentric when it undergoes compression deformation during the impact. It can accurately simulate the compression process of the energy-absorbing tube on the braking device to verify the buffer energy absorption capacity of the energy-absorbing tube. It is easy to assemble and disassemble and has high testing efficiency.

[0016] (2) The energy absorption performance test device of the falling hammer-based energy absorption tube of the present invention reduces the weight of each part by setting the mounting base to consist of a base plate, a support component and a guide plate. First, the base plate is installed on the second sensor, then the support component is installed on the base plate, and finally the guide plate is installed on the support component by sliding connection, so that the mounting base is easy to install on the second sensor. At the same time, the first through hole is set on the guide plate, and the guide plate is used to guide the guide rod. If the guide rod breaks in the first through hole, the guide plate can be directly pulled out from the support component to clean the broken part of the guide rod, which is convenient, quick and efficient.

[0017] (3) The energy absorption performance test device based on the falling hammer of the present invention has a simple structure, few parts and low cost, which greatly reduces the test cost; it is connected between structures through multiple detachable connections, which makes assembly and disassembly convenient, and facilitates rapid assembly for testing or disassembly and storage after the test.

[0018] (4) The energy absorption performance test method of the energy absorption tube based on the drop hammer of the present invention uses the energy absorption performance test device based on the drop hammer to conduct an impact test on the energy absorption tube, which can accurately simulate and replace the actual working conditions, with a high degree of impact simulation, and can effectively verify the buffer energy absorption capacity of the energy absorption tube. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the energy absorption performance test device based on the falling weight energy absorption tube in this embodiment of the invention; Figure 2 This is a cross-sectional view of the mounting base in an embodiment of the present invention; Figure 3 This is a schematic diagram of the installation of the energy-absorbing tube in an embodiment of the present invention; Figure 4 This is a schematic diagram of the hammer assembly in an embodiment of the present invention; In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1. Mounting bracket; 11. Guide rail; 12. Base; 2. Hammer assembly; 21. Slider; 22. Connector; 23. Counterweight; 3. First sensor; 4. Second sensor; 5. Mounting seat; 51. Base plate; 52. Support assembly; 53. Guide plate; 531. Weight reduction hole; 532. Third through hole; 533. Fourth through hole; 6. Guide rod; 7. Impact head; 8. Guide tube; 9. Connecting flange; 10. Energy-absorbing tube. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] Example: Please see Figures 1-4 The energy absorption performance testing device based on the falling hammer energy-absorbing tube 10 in the preferred embodiment of the present invention includes a mounting frame 1, a hammer assembly 2, a detection assembly, a mounting assembly, a lifting mechanism, and a control system.

[0027] The mounting frame 1 is equipped with a vertically extending guide rail 11, and the hammer assembly 2 is slidably connected to the guide rail. The detection assembly includes a first sensor 3 and a second sensor 4. The first sensor 3 is mounted on the hammer assembly 2 and is used to measure the acceleration of the hammer assembly 2 in real time during the test. The second sensor 4 is mounted on the mounting frame 1 located on one side of the guide rail 11 and its top surface is perpendicular to the guide rod 6, and is used to measure the impact force received during the test in real time. The mounting assembly includes a mounting base 5, a guide rod 6, and an impact head 7. The mounting base 5 is detachably connected to the second sensor 4. The top surface of the mounting base 5 is perpendicular to the guide rail 11. The mounting base 5 has a through hole that connects to its top surface and extends vertically. The through hole includes a first through hole located at the top and a second through hole located at the bottom. The second through hole is square, and the projection area of ​​the second through hole on the horizontal plane includes the projection area of ​​the first through hole on the horizontal plane; the bottom end of the guide rod 6 can extend into the first through hole, and the top end of the guide rod 6 is threadedly connected to the impact head 7, so that the guide rod 6 located between the impact head 7 and the mounting base 5 forms the mounting position of the energy-absorbing tube 10; the impact head 7 is used to receive the falling hammer assembly 2; the length of the guide rod 6 is not greater than the length of the first through hole, the guide rod 6 is clearance-fitted with the first through hole, and can move along the first through hole to provide guidance for the compression deformation of the energy-absorbing tube 10 sleeved on the outside of the guide rod; the lifting mechanism is used to lift and release the hammer assembly 2; the control system is electrically connected to the first sensor 3 and the second sensor 4 to record the acceleration changes and impact force changes during the impact process.

[0028] In this preferred embodiment, the guide rod 6 and the first through hole are clearance-fitted, and the length of the first through hole is not less than the length of the guide rod 6, ensuring that the first through hole can provide guidance for the entire movement process of the guide rod 6. Before the test, the energy-absorbing tube 10 is installed in the mounting position. The specific installation process is as follows: the energy-absorbing tube 10 to be tested is sleeved on the guide rod 6, then the impact head 7 is threaded to the top of the guide rod 6, and then the bottom end of the guide rod 6 is inserted into the first through hole of the mounting base 5, so that the bottom of the energy-absorbing tube 10 abuts against the top surface of the mounting base 5, and the top of the energy-absorbing tube 10 abuts against the impact head 7. The energy-absorbing tube 10 vertically supports the impact head 7 and the guide rod 6 on the mounting base 5. During the test, the lifting mechanism raises the hammer assembly 2 along the track to the required test height, and then releases the hammer assembly 2, allowing it to fall freely under the guidance of the guide rail 11, impacting the impact head 7 and the energy-absorbing tube 10. The energy-absorbing tube 10, constrained by the impact head 7, the mounting base 5, and the guide rod 6, cannot move laterally; it can only undergo vertical compression deformation as the guide rod 6 moves through the first through hole. Simultaneously, the first sensor 3 and the second sensor 4 are activated when the hammer is released, allowing the control system to record the acceleration and impact force changes during the impact process for analyzing the energy absorption performance of the energy-absorbing tube 10. Furthermore, the top surface of the second sensor 4 is perpendicular to the guide rail 11, ensuring that it measures a more accurate vertical impact force rather than its component. After the test, the impact head 7, located at the top of the mounting base 5, can be removed from the mounting base 5 along with the guide rod 6. The threaded connection between the impact head 7 and the guide rod 6 can then be unscrewed, allowing the impact head 7 to be recycled for reuse. The guide rod 6 is a consumable for each test. If the guide rod 6 breaks during the impact test, the mounting base 5 needs to be removed from the second sensor 4 so that the broken part of the guide rod 6 inside the through hole can be pushed out of the mounting base 5 along the through hole (first through hole and second through hole). Then, the cleaned mounting base 5 can be installed on the second sensor 4 to carry out the next test.

[0029] The energy absorption performance testing device of the energy-absorbing tube 10 based on the falling hammer of the present invention, by setting a vertically extending guide rail 11 and a top surface of the mounting base 5 perpendicular to the guide rail 11, ensures that the energy-absorbing tube 10 can remain vertical when installed on the top surface of the mounting base 5. This ensures that the hammer assembly 2 can vertically impact the impact head 7 standing at the top of the energy-absorbing tube 10 after free fall along the guide rail 11. Furthermore, the gap fit between the guide rod 6 inserted in the energy-absorbing tube 10 and the vertically extending first through hole ensures that the compression deformation of the energy-absorbing tube 10 during the impact is also vertical. The vertical guidance formed by the guide rod and the first through hole further ensures that the energy-absorbing tube 10 will not jam or become eccentric during the compression process. It can accurately simulate the compression process of the energy-absorbing tube 10 on the braking device to verify the buffer energy absorption capacity of the energy-absorbing tube 10. It is easy to assemble and disassemble and has high testing efficiency.

[0030] Preferably, the energy-absorbing tube 10 and the guide rod 6 are clearance-fitted. After applying grease / oil to the side wall of the guide rod 6 and / or the inner wall of the energy-absorbing tube 10, the guide rod 6 is inserted into the energy-absorbing tube 10 to reduce friction between the two.

[0031] Preferably, the energy-absorbing tube 10 selected for the test has a uniform inner diameter and a larger outer diameter at one end and a smaller outer diameter at the other end. The larger outer diameter end is used to abut against the top surface of the mounting base 5, and the smaller outer diameter end is used to abut against the impact head 7. This ensures that the energy-absorbing tube 10 can stably support the impact head 7 and the guide rod 6 on the mounting base 5 before the test. At the same time, it is convenient to align the two ends of the guide rod 6 with the two ends of the energy-absorbing tube 10 before the energy-absorbing tube 10 is sleeved on the guide rod 6.

[0032] Preferably, a base 12 is provided between the second sensor 4 and the mounting bracket 1. The base 12 is perpendicular to the guide rail 11 and is fixedly connected to the mounting bracket 1. The second sensor 4 is mounted on the base 12. By setting the base 12, the stability of the second sensor 4 installation can be improved.

[0033] Specifically, preferably, the base 12 is a steel plate, and the base 12 is preferably welded to the mounting frame 1.

[0034] More preferably, the mounting frame 1 is assembled and welded from multiple channel steels and multiple square tubes to ensure the strength of the mounting frame 1 and provide stable support for other test equipment.

[0035] Preferably, the guide rail 11 is connected to the mounting frame 1 by a channel steel, the channel steel is welded to the mounting frame 1, and the guide rail 11 is bolted to the channel steel to ensure the connection strength between the base 12 and the guide rail 11 and the mounting frame 1.

[0036] Preferably, the second sensor 4 is a pressure sensor, which is bolted to the base 12 and connected to the mounting base 5 via a connecting flange 9. Specifically, the connecting flange 9 is formed by welding a cylinder and a square plate; the cylinder is bolted to the second sensor 4, and the square plate is bolted to the mounting base 5.

[0037] Preferably, the first sensor 3 is an inertial measurement unit.

[0038] More preferably, the mounting base 5 includes a base plate 51, a support assembly 52, and a guide plate 53. The base plate 51 is detachably connected to the second sensor 4, and the support assembly 52 is detachably connected to the base plate 51. The support assembly 52 is provided with two parallel and spaced guide grooves. The two sides of the guide plate 53 are slidably connected to the two guide grooves respectively. The top surface of the guide plate 53 is perpendicular to the guide rail 11, and a first through hole is provided on the guide plate 53.

[0039] In this embodiment, the mounting base 5 is configured as a series of components to reduce the weight of each component and facilitate its installation on the second sensor 4. Furthermore, the connection between the guide plate 53 and the support assembly 52 is configured as a sliding fit to facilitate the installation or removal of the guide plate 53. The top surface of the guide plate 53 is perpendicular to the guide rail 11 to ensure that the energy-absorbing tube 10 is mounted on the top surface of the guide plate 11 to receive the vertical impact of the hammer assembly 2. Simultaneously, the first through hole is located on the guide plate 53, allowing the guide rod 6 to be guided simply by the guide plate 53. If the guide rod 6 breaks in the first through hole, the guide plate 53 can be directly removed from the support assembly 52 to clean the broken portion of the guide rod 6, which is convenient and quick. Correspondingly, the second through hole is located at the bottom of the first through hole. For example, it can be located on both the guide plate 53 and the base plate 51, or only on the base plate 51.

[0040] Preferably, the guide plate 53 is provided with weight-reducing holes 531 to further reduce the weight of the guide plate 53 and facilitate the assembly and disassembly of the guide plate 53. Preferably, multiple weight-reducing holes 531 are provided and symmetrically distributed on the guide plate 53 along the first through hole, so that the guide plate 53 can form a symmetrical structure along the first through hole.

[0041] Preferably, a guide tube 8 is installed in the middle of the guide plate 53, and the first through hole is located entirely or partially inside the guide tube 8.

[0042] In this embodiment, the guide tube 8 is used to ensure the guidance of the guide rod 6 inside the guide plate 53. When the top end of the guide tube 8 is flush with the top surface of the guide plate 53, the first through hole is preferably entirely located inside the guide tube 8; when the top end of the guide tube 8 is lower than the top surface of the guide plate 53, the first through hole is partially located inside the guide tube 8.

[0043] In a preferred embodiment, the guide plate 53 is provided with a third through hole 532 located above and a fourth through hole 533 located below, corresponding to the guide tube 8. The third through hole 532 and the fourth through hole 533 are coaxial and connected by a weight-reducing hole 531. The guide tube 8 is installed in the third through hole 532 and the fourth through hole 533. More specifically, the third through hole 532 is a two-stage through hole composed of a large-diameter section and a small-diameter section, with the small-diameter section located above and the large-diameter section located below. The guide tube 8 is installed in the large-diameter section of the third through hole 532 and the fourth through hole 533. The top surface of the guide tube 8 abuts against the bottom surface of the small-diameter section to facilitate the installation of the guide tube 8 in the guide plate 53. At this time, the first through hole is composed of the small-diameter section and the channel inside the guide tube 8.

[0044] More preferably, the hammer assembly 2 includes a slider 21, a counterweight 23 and a connector 22. The slider 21 is slidably connected to the guide rail 11, and one side of the connector 22 is threadedly connected to the slider 21 and the other side is threadedly connected to the counterweight 23.

[0045] In this embodiment, the slider 21, the counterweight 23, and the connector 22 together form the hammer assembly 2, which impacts the impact head 7. The counterweight 23 is bolted to the connector 22, so that the counterweight 23 selected for each test can be replaced. The weight of the counterweight 23 is preferably calculated according to the test requirements. The slider 21 is slidably connected to the guide rail 11, which guides the counterweight 23 to prevent lateral impact on the energy-absorbing tube 10 during the impact process, thereby affecting the test results.

[0046] Preferably, the counterweight 23 is made of steel, and the lifting mechanism is a permanent magnet lifter.

[0047] In practical use, the present invention also provides a method for testing the energy absorption performance of a drop-weight-based energy-absorbing tube 10, which utilizes the aforementioned test device for testing the energy absorption performance of a drop-weight-based energy-absorbing tube 10 and includes the following steps: Install the energy-absorbing tube 10 in the mounting position; The lifting mechanism raises the hammer assembly 2 to the required height for the test; The lifting mechanism releases the hammer assembly 2, and simultaneously activates the first sensor 3, the second sensor 4, and the control system. The hammer assembly 2 falls vertically and impacts the impact head 7 and the energy-absorbing tube 10. The control system records the changes in acceleration and impact force during the impact process.

[0048] In this embodiment, the required height for the test is calculated using the free-fall formula based on the impact test requirements and the energy equivalence method. The energy absorption performance test method of the energy-absorbing tube 10 based on the drop hammer in this invention uses the energy absorption performance test device of the energy-absorbing tube 10 based on the drop hammer to conduct an impact test on the energy-absorbing tube 10. It can accurately simulate and replace the actual working conditions, with a high degree of impact simulation, and can effectively verify the buffering energy absorption capacity of the energy-absorbing tube 10.

[0049] Those skilled in the art will readily understand that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A test device for the energy absorption performance of a drop weight-based energy-absorbing tube, characterized in that, include: Mounting bracket, wherein the mounting bracket is provided with a guide rail extending vertically; A hammer assembly, wherein the hammer assembly is slidably connected to the track; The detection component includes a first sensor and a second sensor; the first sensor is mounted on the hammer assembly and is used to measure the acceleration of the hammer assembly in real time during the test; the second sensor is mounted on the mounting bracket located on one side of the guide rail and its top surface is perpendicular to the guide rod, and is used to measure the impact force received during the test in real time. The mounting assembly includes a mounting base, a guide rod, and an impact head; the mounting base is detachably connected to the second sensor, the top surface of the mounting base is perpendicular to the guide rail, and the mounting base has a through hole that connects to its top surface and extends vertically, the through hole includes a first through hole located above and a second through hole located below, the projection area of ​​the second through hole in the horizontal plane includes the projection area of ​​the first through hole in the horizontal plane; The bottom end of the guide rod can extend into the first through hole, and the top end of the guide rod is threadedly connected to the impact head, so that the guide rod located between the impact head and the top surface of the mounting base forms a mounting position for the energy-absorbing tube; the impact head is used to receive the falling hammer assembly; the length of the guide rod is not greater than the length of the first through hole, the guide rod is clearance-fitted with the first through hole, and can move along the first through hole to provide guidance for the compression deformation of the energy-absorbing tube sleeved on the outside of the guide rod; A lifting mechanism for lifting and releasing the hammer assembly; The control system is electrically connected to the first sensor and the second sensor to record changes in acceleration and impact force during the impact process.

2. The energy absorption performance testing device based on a falling weight energy-absorbing tube according to claim 1, characterized in that, A base is provided between the second sensor and the mounting bracket. The base is perpendicular to the guide rail and is fixedly connected to the mounting bracket. The second sensor is mounted on the base.

3. The energy absorption performance testing device based on a falling weight energy-absorbing tube according to claim 2, characterized in that, The mounting base includes a base plate, a support assembly, and a guide plate. The base plate is detachably connected to the second sensor, and the support assembly is detachably connected to the base plate. The support assembly is provided with two parallel and spaced guide grooves. The two sides of the guide plate are slidably connected to the two guide grooves respectively. The top surface of the guide plate is perpendicular to the guide rail, and the first through hole is provided on the guide plate.

4. The energy absorption performance testing device based on a falling weight energy-absorbing tube according to claim 3, characterized in that, The guide plate is provided with weight reduction holes.

5. The energy absorption performance testing device based on a falling weight energy-absorbing tube according to claim 4, characterized in that, A guide tube is installed in the middle of the guide plate, and the first through hole is located entirely or partially inside the guide tube.

6. The energy absorption performance testing device based on a falling weight energy-absorbing tube according to any one of claims 1 to 5, characterized in that, The hammer assembly includes a slider, a counterweight, and a connector. The slider is slidably connected to the guide rail, and one side of the connector is threadedly connected to the slider, while the other side is threadedly connected to the counterweight.

7. The energy absorption performance testing device based on a falling weight energy-absorbing tube according to any one of claims 1 to 5, characterized in that, The counterweight is made of steel, and the lifting mechanism is a permanent magnet lifter.

8. The energy absorption performance testing device for a drop-weight-based energy-absorbing tube according to any one of claims 2 to 5, characterized in that, The base is welded to the mounting bracket; And / or, The guide rail is connected to the mounting frame via a channel steel, the channel steel is welded to the mounting frame, and the guide rail is bolted to the channel steel; And / or, The mounting frame is assembled and welded from multiple channel steels and multiple square tubes.

9. The energy absorption performance testing device based on a falling weight energy-absorbing tube according to any one of claims 2 to 5, characterized in that, The second sensor is a pressure sensor, which is bolted to the base and connected to the mounting base via a connecting flange.

10. A method for testing the energy absorption performance of a drop-weight energy-absorbing tube, using the test apparatus for testing the energy absorption performance of a drop-weight energy-absorbing tube as described in any one of claims 1 to 9, comprising the following steps: Install the energy-absorbing tube in the mounting position; The lifting mechanism raises the hammer assembly to the required height for the test; The lifting mechanism releases the hammer assembly and simultaneously activates the first and second sensors, as well as the control system. The hammer assembly falls vertically and impacts the impact head and energy-absorbing tube. The control system records the changes in acceleration and impact force during the impact process.

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