A test device for vibration transfer characteristics of dumbbell-type mass system cushioning materials

Abstract

The present invention discloses a dumbbell-type mass system buffer material vibration transfer characteristic test device, which relates to the technical field of material mechanical property testing. The upper pressure frame is connected to a desktop workbench or a vibration table top. The dumbbell-type mass system includes an upper mass, a connecting rod and a lower mass. The upper mass and the lower mass are respectively connected to the upper end and the lower end of the connecting rod. The connecting rod is connected to the desktop workbench through a linear bearing. The lower mass includes a plurality of weight-type masses. Buffer material samples are arranged between the upper pressure frame and the upper mass, and between the upper mass and the desktop workbench. The upper buffer material sample is connected to the upper mass. The connecting rod passes through the lower buffer material sample. The excitation sensor is arranged on the desktop workbench, and the response sensor is arranged on the upper mass. The present invention can test single-layer materials or double-layer materials and can ensure the stability of the mass system.

Description

Technical Field

[0001] The present invention relates to the technical field of material mechanical property testing, mainly to vibration transfer characteristic testing of buffer materials, and in particular to a dumbbell-type mass system buffer material vibration transfer characteristic testing device. Background Art

[0002] The vibration transfer characteristics of cushioning packaging materials are a key performance characteristic of transport packaging protection. Vibration transfer characteristics experiments determine the system's transmissibility, the dimensionless ratio of the system's response amplitude to the excitation amplitude during steady-state forced vibration. The packaging material vibration transfer characteristics testing system consists of cushioning material and a mass. Accelerometers are mounted on the vibration table and mass, respectively, to record the system's excitation and response accelerations as they vary with frequency. The ratio of the response acceleration to the excitation acceleration at different frequencies yields a curve of the system's transmissibility versus frequency, representing the system's vibration transfer characteristics.

[0003] Because the packaging system is primarily subjected to vertical vibration during transportation, the vibration transfer characteristics of cushioning packaging materials are also primarily tested in the vertical direction. Existing testing methods and devices for the vibration transfer characteristics of cushioning packaging materials also test in the vertical direction. There are three modes for testing the vertical vibration transfer characteristics of cushioning materials.

[0004] Reference 1 (Schueneman Herbert H..Product-and-Package-Vibration-Testing [Online]. Westpak, Inc. 2016) provides explanations of the principles of two commonly used methods: the first is a spring-mass system formed by bonding a single-layer cushioning material, a mass block, and a vibration table with an adhesive, referred to as the TC mode (Tension-Cushion Model). During vibration, the cushioning material is subjected to both tensile and compressive stresses. The second is a double-layer cushioning material, in which the mass block is placed between upper and lower cushioning materials, which is then fixed to the vibration table with a compression frame. This is referred to as the CC mode (Cushion-Cushion Model). During vibration, the material is subjected only to compressive stress.

[0005] Reference 2 (Parker Anthony James. A method of characterisation of the nonlinear vibration transmissibility of cushioning materials [D]. Melbourne: Victoria University, 2007: 54) uses a guided mass block to test a single-layer cushioning packaging material, referred to as the GM-C (Guide Mass-Cushion Model) mode, which is the third mode of vertical vibration transmissibility testing.

[0006] The first and third modes are for testing single-layer materials, while the second mode is for testing double-layer materials. Current national and international standards primarily use the second test mode, such as Reference 3 (Package Cushioning Design. MIL-HDBK-304C. US: Department of Defense, 1997: 30-32.), a US military packaging design manual, and Reference 4 (GB / T8169-2008 Test Method for Vibration Transmission Characteristics of Packaging Cushioning Materials [S]).

[0007] To address the shortcomings of the second test mode, Document 5 (published as CN103336061B, entitled "A Fixture for Testing Vibration Transmissibility of Cushioning Materials") offers an improved design. It incorporates a device for adjusting the static pressure of the cushioning material and a sensor for real-time static pressure measurement. This allows the test system to be loaded according to the set static pressure, ensuring consistency across tests. However, this device does not address the potential for displacement or separation of the cushioning material or mass system due to the lack of a horizontal perimeter fence during vibration, which can easily lead to experimental failure or damage to the test apparatus.

[0008] To address the shortcomings of the third test mode, Document 6 (publication number CN211061475U, patent title: A fixture for testing the vibration transferability of tabletop gravity-type buffer materials) invented a fixture. This fixture uses a bracket mounted on the vibration table top, with a linear sliding guide between the mass block system and the bracket to ensure that the mass block and buffer material are always aligned and vibrating up and down during the vibration test. However, this device has two shortcomings: first, it can only test single-layer materials; second, when the mass system is heavy, the mass system's stability deteriorates, which can easily lead to deformation of the guide shaft. Summary of the Invention

[0009] The purpose of the present invention is to provide a dumbbell-type mass system cushioning material vibration transfer characteristic test device to solve the problem of vertical vibration transfer characteristic testing of a system composed of a cushioning material sample and a dumbbell-type mass system.

[0010] To achieve the above object, the present invention provides the following solutions:

[0011] The present invention provides a dumbbell-type mass system buffer material vibration transfer characteristic test device, comprising an upper pressure frame, a dumbbell-type mass system, a desktop workbench, an anti-collision material, a vibration table top, an excitation sensor and a response sensor, wherein the desktop workbench is arranged on the vibration table top, the upper pressure frame is connected to the desktop workbench or the vibration table top, the dumbbell-type mass system comprises an upper mass, a connecting rod and a lower mass, the upper mass and the lower mass are respectively connected to the upper end and the lower end of the connecting rod, the connecting rod is connected to the desktop workbench through a linear bearing, the lower mass comprises a plurality of weight-type masses, buffer material samples are arranged between the upper pressure frame and the upper mass and between the upper mass and the desktop workbench, the buffer material sample between the upper pressure frame and the upper mass is connected to the upper mass, the connecting rod passes through the buffer material sample between the upper mass and the desktop workbench, the excitation sensor is arranged on the desktop workbench, and the response sensor is arranged on the upper mass.

[0012] Preferably, the upper pressure frame includes a compression beam, a compression screw, a compression plate and two column screws. The compression screw and the two column screws pass through the compression beam and are connected to the compression beam. The compression screw is located between the two column screws. The lower end of the compression screw is connected to the pressure plate, and the lower ends of the two column screws are connected to the desktop workbench or the vibration table top.

[0013] Preferably, the upper mass includes an upper cover plate, a mass upper base and a lower cover plate arranged and connected from top to bottom, a hollow hole is provided in the mass upper base, and the upper end of the connecting rod extends into the lower cover plate and the mass upper base in turn, and is threadedly connected to the mass upper base.

[0014] Preferably, it further comprises a limiting column, the lower end of which is connected to the upper cover plate, and the buffer material sample between the upper pressure frame and the upper mass is sleeved on the outer side of the limiting column.

[0015] Preferably, a threaded hole D is provided on the side of the mass upper base, and a connecting rod upper hole is opened at the upper end of the connecting rod, and a fastening screw A passes through the threaded hole D and the connecting rod upper hole in sequence to fasten the mass upper base and the connecting rod.

[0016] Preferably, the lower mass also includes a mass lower base and a fastening nut, the fastening nut is sleeved on the connecting rod and threadedly connected to the connecting rod, the mass lower base is threadedly connected to the connecting rod, and several of the weight-type masses are located between the fastening nut and the mass lower base.

[0017] Preferably, a threaded hole B is provided on the side of the mass lower base, and a connecting rod lower hole is opened at the lower end of the connecting rod, and a fastening screw B passes through the threaded hole B and the connecting rod lower hole in sequence to fasten the mass lower base and the connecting rod.

[0018] Preferably, the desktop workbench is a four-column desktop symmetrical structure, and the desktop workbench includes a workbench plane, a bottom frame and four workbench columns. The upper ends of the four workbench columns are connected to the workbench plane, and the lower ends of the four workbench columns are connected to the bottom frame. A frame ear is provided at each end of the workbench plane, and the frame ear is used to connect to the upper pressure frame. The linear bearing is provided in the top through hole of the workbench plane, and the bottom frame is connected to the vibration table surface. The bottom frame is provided with an anti-collision material limiting square hole, and the anti-collision material limiting square hole is used to place anti-collision material.

[0019] Compared with the prior art, the present invention has achieved the following technical effects:

[0020] 1) A dumbbell-type mass system is proposed. This system divides the vibrating mass into two parts: the upper part remains unchanged, while the lower part can be combined as needed. This method reduces the center of gravity of the mass system and improves the stability of the vibrating mass system.

[0021] 2) The dumbbell-type mass system uses a guide system with connecting rods and linear bearings, eliminating the need to worry about mass system offset while minimizing the impact of friction on vibration.

[0022] 3) The lower mass of the dumbbell-type mass system is easy to combine;

[0023] 4) The upper mass of the dumbbell-type mass system is easy to disassemble and assemble, which facilitates the rapid installation of cushioning material samples;

[0024] 5) The upper pressure frame can be installed on a desktop workbench or directly on the vibration table;

[0025] 6) Anti-collision materials can avoid damage to the quality or vibration system during installation or vibration;

[0026] 7) The device can test the vibration transfer characteristics of a system consisting of two buffer material samples or a single buffer material sample. When testing a single buffer material sample, the buffer material sample is directly limited by the connecting rod of the dumbbell-type mass system. When testing two buffer material samples, the upper buffer material sample is positioned by the limiting column. There is no need to worry about the displacement of the buffer material sample during the vibration process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 Schematic diagram of the vibration transfer characteristics test device for the dumbbell-type mass system cushioning material of the present invention (the upper pressure frame is connected to the desktop workbench);

[0029] Figure 2 for Figure 1 Schematic diagram of the decomposition structure;

[0030] Figure 3 Schematic diagram of the vibration transfer characteristics test device for the dumbbell-type mass system cushioning material of the present invention (the upper pressure frame is connected to the vibration table surface);

[0031] Figure 4 This is a structural diagram of the present invention applied to the testing of a single-layer cushioning material sample;

[0032] Figure 5 for Figure 4 Schematic diagram of the decomposition structure;

[0033] Figure 6 It is a structural schematic diagram of the upper pressing frame of the present invention;

[0034] Figure 7 It is a structural schematic diagram of the dumbbell-type mass system of the present invention;

[0035] Figure 8 for Figure 7 Schematic diagram of the decomposition structure;

[0036] Figure 9 A top view of the mass base of the present invention;

[0037] Figure 10 It is a cross-sectional view of the mass base of the present invention;

[0038] Figure 11 The three-dimensional structure of the desktop workbench of the present invention Figure 1 ;

[0039] Figure 12 The three-dimensional structure of the desktop workbench of the present invention Figure 2 ;

[0040] Wherein: 1. Upper pressure frame, 2. Dumbbell mass system, 3. Desktop workbench, 4. Anti-collision material, 5. Vibration table surface, 6. Bolt A, 7. Cushioning material sample, 8. Excitation sensor, 9. Response sensor, 10. Limit column;

[0041] 11. Column screw, 12. Compression beam, 13. Pressure screw, 131. Square head, 14. Pressure plate, 15. Nut set A, 16. Nut set B, 17. Nut;

[0042] 21. Upper mass, 22. Connecting rod, 24. Lower mass;

[0043] 211. Bolt B, 212. Upper cover, 213. Mass upper base, 214. Fastening screw A, 215. Lower cover;

[0044] 2131. Hollow hole, 2132. Threaded hole C, 2133. Through hole B, 2134. Threaded hole D;

[0045] 221. Upper hole of connecting rod, 222. Lower hole of connecting rod;

[0046] 241. Mass lower base, 242. Fastening screw B, 243. Weight mass, 244. Fastening nut, 245. Threaded hole A, 246. Threaded hole B;

[0047] 31. Bottom frame, 32. Bottom frame through hole, 33. Workbench column, 34. Workbench plane, 35. Top through hole, 36. Frame ear, 37. Frame threaded hole, 38. Linear bearing, 39. Anti-collision material limit square hole. DETAILED DESCRIPTION

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] The purpose of the present invention is to provide a dumbbell-type mass system cushioning material vibration transfer characteristic test device to solve the problem of vertical vibration transfer characteristic testing of a system composed of a cushioning material sample and a dumbbell-type mass system.

[0050] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] like Figures 1 to 12 As shown: This embodiment provides a dumbbell-type mass system buffer material vibration transfer characteristic test device, including an upper pressure frame 1, a dumbbell-type mass system 2, a desktop workbench 3, an anti-collision material 4, a vibration table top 5, an excitation sensor 8 and a response sensor 9, the desktop workbench 3 is fixed to the center of the vibration table top 5 by a bolt A6, the upper pressure frame 1 is connected to the desktop workbench 3 or the vibration table top 5, the dumbbell-type mass system 2 is a dumbbell-type structure, the dumbbell-type mass system 2 includes an upper mass 21, a connecting rod 22 and a lower mass 24, the upper mass 21 and the lower mass 24 are respectively connected to the upper end and the lower end of the connecting rod 22, the upper mass 21 and the lower mass 24 are the two ends of the dumbbell-type structure, the connecting rod 22 is the rod part of the dumbbell-type structure, and the connecting rod 2 2 has threads at both ends and a smooth rod in the middle. The connecting rod 22 is connected to the desktop workbench 3 via a linear bearing 38. The lower mass 24 includes several weight-type masses 243. Cushioning material samples 7 are placed between the upper pressing frame 1 and the upper mass 21, and between the upper mass 21 and the desktop workbench 3. The cushioning material sample 7 between the upper pressing frame 1 and the upper mass 21 (the upper cushioning material sample 7) is connected to the upper mass 21. The connecting rod 22 passes through the cushioning material sample 7 between the upper mass 21 and the desktop workbench 3 (the lower cushioning material sample 7). The excitation sensor 8 is located at the edge of the top plane of the desktop workbench 3. When there are two cushioning material samples 7, the response sensor 9 is located at the edge of the top plane of the upper mass 21. When there is only one cushioning material sample 7, the response sensor 9 is located at the center of the top plane of the upper mass 21.

[0052] Specifically, in this embodiment, the upper pressing frame 1 , the dumbbell-type mass system 2 and the buffer material sample 7 are coaxially arranged.

[0053] In this embodiment, the upper pressure frame 1 includes a clamping beam 12, a pressure screw 13, a pressure plate 14 and two column screws 11. The two column screws 11 pass through the through hole of the clamping beam 12 and are symmetrically connected to the clamping beam 12 through a nut group A15. The two nuts 17 are respectively installed at the bottom of the two column screws 11. The pressure screw 13 is located between the two column screws 11. The pressure screw 13 is installed in the middle threaded hole of the clamping beam 12. The nut group B16 is installed on the upper and lower sides of the pressure screw 13. The top of the pressure screw 13 has a square head 131. The lower end of the pressure screw 13 is connected to the pressure plate 14. The pressure plate 14 presses the buffer material sample 7 between the upper pressure frame 1 and the upper mass 21. The lower ends of the two column screws 11 are connected to the desktop workbench 3 or the vibration table top 5.

[0054] In this embodiment, the upper mass 21 is a three-layer composite structure, and the upper mass 21 includes an upper cover plate 212, a mass upper base 213 and a lower cover plate 215 arranged from top to bottom. The upper cover plate 212, the mass upper base 213 and the lower cover plate 215 are fixed together by bolts B211, and the bolts B211 extend into the through holes B2133 of the mass upper base 213. Four symmetrical circular hollow holes 2131 are provided in the mass upper base 213, which can minimize the weight of the mass upper base 213. The upper end of the connecting rod 22 extends into the lower cover plate 215 and the mass upper base 213 in turn, and is threadedly connected to the threaded hole C2132 of the mass upper base 213.

[0055] This embodiment also includes a limiting column 10, which is a limiting cylinder. The lower end of the limiting column 10 is threadedly connected to the center position of the upper cover plate 212. The center of the buffer material sample 7 between the upper pressure frame 1 and the upper mass 21 has a circular through hole, and the buffer material sample 7 between the upper pressure frame 1 and the upper mass 21 is sleeved on the outside of the limiting column 10.

[0056] In this embodiment, a threaded hole D2134 is provided on the side of the mass base 213, and a connecting rod upper hole 221 is opened at the upper end of the connecting rod 22. The fastening screw A214 passes through the threaded hole D2134 and the connecting rod upper hole 221 in sequence to fasten the mass base 213 and the connecting rod 22.

[0057] In this embodiment, the lower mass 24 is a combined structure, and the lower mass 24 also includes a mass lower base 241 and a fastening nut 244. The fastening nut 244 is sleeved on the connecting rod 22 and is threadedly connected to the connecting rod 22. The mass lower base 241 is a cylindrical structure, and the center of the mass lower base 241 has a threaded hole A245. The mass lower base 241 is installed on the end of the connecting rod 22 through the threaded hole A245. The weight-type mass 243 is a semicircular hole structure, two pieces are a group, and multiple groups of weight-type masses 243 are combined with the mass lower base 241 to achieve different The mass combination of the dumbbell-type mass system 2, several weight-type masses 243 are located between the fastening nut 244 and the lower base 241 of the mass, the fastening nut 244 presses the weight-type mass 243 and the lower base 241 of the mass, the side of the lower base 241 of the mass is provided with a threaded hole B246, and the lower end of the connecting rod 22 is provided with a connecting rod lower hole 222, and the fastening screw B242 passes through the threaded hole B246 and the connecting rod lower hole 222 in turn to achieve the fastening of the lower base 241 of the mass and the connecting rod 22, thereby preventing the lower base 241 of the mass and the connecting rod 22 from rotating.

[0058] In this embodiment, the desktop workbench 3 is a four-column desktop symmetrical structure. The desktop workbench 3 includes a workbench plane 34, a bottom frame 31 and four workbench columns 33. The upper ends of the four workbench columns 33 are connected to the workbench plane 34, and the lower ends of the four workbench columns 33 are connected to the bottom frame 31. The bottom frame 31, the four workbench columns 33 and the workbench plane 34 form the main body of the desktop workbench 3. The center of the workbench plane 34 has a top through hole 35, and a linear bearing 38 extends from the workbench plane 34. The bottom is fixed by the top through hole 35, and a frame ear 36 is provided at each end of the workbench plane 34. The frame ear 36 has a frame threaded hole 37. The frame ear 36 is used to connect with the column screw 11 of the upper pressure frame 1. The linear bearing 38 is provided in the top through hole 35 of the workbench plane 34. The bottom frame 31 has a bottom frame through hole 32 and an anti-collision material limiting square hole 39. The bottom frame through hole 32 is used to fix the desktop workbench 3 and the vibration table surface 5, and the anti-collision material limiting square hole 39 is used to place the anti-collision material 4.

[0059] Application Example 1

[0060] The test sample is a single piece of cushioning material sample 7, refer to Figures 4 to 12 , steps for testing single piece buffer material sample 7:

[0061] Step 1: Fix the desktop workbench 3: Place the desktop workbench 3 at the center of the vibration table 5, and use bolts A6 to fix the desktop workbench 3 and the vibration table 5 together through the bottom frame through-holes 32 of the bottom frame 31 of the desktop workbench 3;

[0062] Step 2: Install the anti-collision material 4: embed the anti-collision material 4 into the anti-collision material limiting square hole 39 of the bottom frame 31 of the desktop workbench 3;

[0063] Step 3, assembling the upper mass 21 of the dumbbell mass system 2: fix the upper cover plate 212, the upper mass base 213 and the lower cover plate 215 together with bolts B211, and install the fastening screws A214 in the threaded holes D2134 of the upper mass base 213;

[0064] Step 4, installation of the connecting rod 22 and the lower mass 24 of the dumbbell-type mass system 2: insert the connecting rod 22 into the linear bearing 38 of the desktop workbench 3; install the lower mass 24 at the bottom end of the connecting rod 22, first screw the fastening nut 244 into the thread at the end of the connecting rod 22, and then screw the lower base 241 of the mass into the thread of the connecting rod 22 through the threaded hole A245. When the lower hole 222 of the connecting rod at the end of the connecting rod 22 is aligned with the threaded hole B246 of the lower base 241 of the mass, install the fastening screw B242 into the threaded hole B246 of the lower base 241 of the mass and pass it through the lower hole 222 of the connecting rod. The lower base 241 of the mass and the connecting rod 22 no longer rotate. Place supporting material at the bottom of the lower base 241 of the mass so that the top of the connecting rod 22 extends out of the top plane of the desktop workbench 3;

[0065] Step five, installation of the lower cushioning material sample 7; place the cushioning material sample 7 on the connecting rod 22 on the top plane of the desktop workbench 3 through the central circular hole of the cushioning material sample 7;

[0066] Step 6. Install the upper mass 21 of the dumbbell-type mass system 2: Install the assembled upper mass 21 into the top thread of the connecting rod 22 through the threaded hole C2132 of the upper base 213 of the mass. When the threaded hole D2134 of the upper base 213 is aligned with the upper hole 221 of the connecting rod 22, screw the fastening screw A214 through the upper hole 221 of the connecting rod 22. The upper mass 21 can no longer rotate with the connecting rod 22.

[0067] Step 7, adjusting the mass of the dumbbell-type mass system 2: install weight-type masses 243 in pairs on the mass lower base 241, and fix the weight-type masses 243 to the mass lower base 241 with fastening nuts 244;

[0068] Step 8: Remove the supporting material at the bottom of the mass base 241 in step 4: the dumbbell-shaped mass system 2 is pressed on the buffer material sample 7 at the bottom by gravity.

[0069] Now that the entire single-block cushioning material sample 7 and dumbbell-type mass system 2 are in a defined operating state, the vibration table can be activated to conduct a vibration transfer characteristic test of the single-block cushioning material sample 7. During the vibration process, the dumbbell-type mass system 2 freely moves vertically under the guidance of the linear bearings 38 of the desktop workbench 3. The vibration transfer characteristic parameters of the single-block cushioning material sample 7 are calculated based on the data from the response sensor 9 and the excitation sensor 8.

[0070] Reference Figures 4 and 5 as well as Figures 7 to 9 , steps for replacing single piece buffer material sample 7:

[0071] Step 1: Lift the dumbbell-shaped mass system 2 upward and place support material on the bottom of the base 241 under the mass;

[0072] Step 2: Disassembly of the upper mass 21 of the dumbbell-type mass system 2: Unscrew the fastening screw A214 from the hole 221 on the connecting rod that passes through the top of the connecting rod 22; then unscrew the upper mass 21 from the top of the connecting rod 22;

[0073] Step 3: Take out the lower cushioning material sample 7 that has completed the test and put in a new lower cushioning material sample 7;

[0074] Step 4: Install the upper mass 21 of the dumbbell-type mass system 2: Install the assembled upper mass 21 into the top thread of the connecting rod 22 through the threaded hole C2132 of the upper base 213 of the mass. When the threaded hole D2134 of the upper base 213 is aligned with the upper hole 221 of the connecting rod 22, screw the fastening screw A214 through the upper hole 221 of the connecting rod 22. The upper mass 21 can no longer rotate with the connecting rod 22.

[0075] Step 5, adjusting the mass of the dumbbell-type mass system 2: insert weight-type masses 243 in pairs on the mass lower base 241, and fix the weight-type masses 243 to the mass lower base 241 with fastening nuts 244;

[0076] Step 6: Remove the support material at the bottom of the mass base 241 in step 1: the dumbbell-shaped mass system 2 is pressed on the new lower cushioning material sample 7 by gravity.

[0077] Application Example 2

[0078] The test samples are two pieces of cushioning material samples 7, refer to the attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 , Attachment Figure 6 , Attachment Figure 7 , Attachment Figure 8 , Attachment Figure 9 , Attachment Figure 10 , Attachment Figure 11 and attached Figure 12 , steps for testing two cushioning material samples 7:

[0079] Step 1: Fix the desktop workbench 3: Place the desktop workbench 3 at the center of the vibration table 5, and use bolts A6 to fix the desktop workbench 3 and the vibration table 5 together through the bottom frame through-holes 32 of the bottom frame 31 of the desktop workbench 3;

[0080] Step 2: Install the anti-collision material 4: embed the anti-collision material 4 into the anti-collision material limiting square hole 39 of the bottom frame 31 of the desktop workbench 3;

[0081] Step 3, assembling the upper mass 21 of the dumbbell mass system 2: fix the upper cover plate 212, the upper mass base 213 and the lower cover plate 215 together with bolts B211, and install the fastening screws A214 in the threaded holes D2134 of the upper mass base 213;

[0082] Step 4, installation of the connecting rod 22 and the lower mass 24 of the dumbbell-type mass system 2: insert the connecting rod 22 into the linear bearing 38 of the desktop workbench 3; install the lower mass 24 at the bottom end of the connecting rod 22, first screw the fastening nut 244 into the thread at the end of the connecting rod 22, and then screw the lower base 241 of the mass into the thread of the connecting rod 22 through the threaded hole A245. When the lower hole 222 of the connecting rod at the end of the connecting rod 22 is aligned with the threaded hole B246 of the lower base 241 of the mass, install the fastening screw B242 into the threaded hole B246 of the lower base 241 of the mass and pass it through the lower hole 222 of the connecting rod. The lower base 241 of the mass and the connecting rod 22 no longer rotate. Place supporting material at the bottom of the lower base 241 of the mass so that the top of the connecting rod 22 extends out of the top plane of the desktop workbench 3;

[0083] Step five, installation of the lower cushioning material sample 7; place the cushioning material sample 7 on the connecting rod 22 on the top plane of the desktop workbench 3 through the central circular hole of the cushioning material sample 7;

[0084] Step 6. Install the upper mass 21 of the dumbbell-type mass system 2: Install the assembled upper mass 21 into the top thread of the connecting rod 22 through the threaded hole C2132 of the upper base 213 of the mass. When the threaded hole D2134 of the upper base 213 is aligned with the upper hole 221 of the connecting rod 22, screw the fastening screw A214 through the upper hole 221 of the connecting rod 22. The upper mass 21 can no longer rotate with the connecting rod 22.

[0085] Step 7, adjusting the mass of the dumbbell-type mass system 2: install weight-type masses 243 in pairs on the mass lower base 241, and fix the weight-type masses 243 to the mass lower base 241 with fastening nuts 244;

[0086] Step 8: Remove the support material at the bottom of the mass base 241 in step 4: The dumbbell mass system 2 relies on gravity to press on the buffer material sample 7 at the bottom;

[0087] Step 9, fixing the upper pressing frame 1: There are two ways to fix the upper pressing frame 1: fixing it to the desktop workbench 3 and the vibration table 5; the first way is to fix the upper pressing frame 1 to the desktop workbench 3: install the two column screws 11 of the assembled upper pressing frame 1 into the frame threaded holes 37 of the frame ears 36 of the desktop workbench 3, and lock the column screws 11 with nuts 17; the second way is to fix the upper pressing frame 1 to the vibration table 5: install the two column screws 11 of the assembled upper pressing frame 1 into the threaded holes of the vibration table 5, and lock the column screws 11 with nuts 17;

[0088] Step 10, installation of the upper buffer material sample 7: Install the limiting post 10 in the top center hole of the upper cover plate 212 of the dumbbell-shaped mass system 2; then place the buffer material sample 7 with a circular through hole on the top limiting post 10 of the dumbbell-shaped mass system 2, and insert the limiting post 10 into the circular through hole of the buffer material sample 7;

[0089] Step 11, adjustment of the pressure plate 14 in the upper pressure frame 1: Loosen the nut group B16 in the upper pressure frame 1 to allow the pressure screw 13 to rotate freely. Use a torque wrench to turn the pressure screw 13 at the square head 131 at the top of the pressure screw 13 to press the pressure plate 14 against the upper buffer material sample 7. After reaching the set pressure, tighten the nut group B16.

[0090] At this point, with the two cushioning material samples 7 and the dumbbell-shaped mass system 2 in a defined operating state, the vibration table can be activated to conduct a vibration transfer characteristic test of the two cushioning material samples 7. During the vibration process, the dumbbell-shaped mass system 2 freely moves vertically under the guidance of the linear bearings 38 of the desktop workbench 3. The vibration transfer characteristic parameters of the two cushioning material systems are calculated based on the data from the response sensor 9 and the excitation sensor 8.

[0091] Reference Figures 1 to 2 as well as Figure 4 , steps for replacing two pieces of cushioning material samples 7:

[0092] Step 1: Adjust the pressure plate 14 in the upper pressure frame 1: Loosen the nut group B16 in the upper pressure frame 1 to allow the pressure screw 13 to rotate freely. Use a wrench to turn the pressure screw 13 at the square head 131 at the top of the pressure screw 13 to move the pressure plate 14 away from the upper buffer material sample 7.

[0093] Step 2: Taking out the upper cushioning material sample 7: Taking out the upper cushioning material sample 7 mounted on the limiting column 10;

[0094] Step 3: Replace the lower cushioning material sample 7: Repeat the steps of replacing the single cushioning material sample 7 in Application Example 1;

[0095] Step 4: Install the new upper cushioning material sample 7: Install the limiting post 10 in the top center hole of the upper cover plate 212 of the dumbbell-shaped mass system 2; then place the new upper cushioning material sample 7 with a circular through hole on the top limiting post 10 of the dumbbell-shaped mass system 2, and insert the limiting post 10 into the circular through hole of the new upper cushioning material sample 7;

[0096] Step 5. Adjustment of the pressure plate 14 in the upper pressure frame 1: Loosen the nut group B16 in the upper pressure frame 1 to allow the pressure screw 13 to rotate freely. Use a torque wrench to rotate the pressure screw 13 at the square head 131 at the top of the pressure screw 13 to press the pressure plate 14 against the new upper buffer material sample 7. After reaching the set pressure, tighten the nut group B16.

[0097] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A dumbbell-type mass system cushioning material vibration transfer characteristics test device, characterized by: It includes an upper pressure frame, a dumbbell-type mass system, a desktop workbench, an anti-collision material, a vibration table top, an excitation sensor and a response sensor, the desktop workbench is arranged on the vibration table top, the upper pressure frame is connected to the desktop workbench or the vibration table top, the dumbbell-type mass system includes an upper mass, a connecting rod and a lower mass, the upper mass and the lower mass are respectively connected to the upper end and the lower end of the connecting rod, the connecting rod is connected to the desktop workbench through a linear bearing, the lower mass includes a plurality of weight-type masses, a buffer material sample is arranged between the upper pressure frame and the upper mass, and between the upper mass and the desktop workbench, the buffer material sample between the upper pressure frame and the upper mass is connected to the upper mass, the connecting rod passes through the buffer material sample between the upper mass and the desktop workbench, the excitation sensor is arranged on the desktop workbench, and the response sensor is arranged on the upper mass; The upper mass includes an upper cover plate, a mass upper base and a lower cover plate which are arranged and connected from top to bottom. A hollow hole is provided in the mass upper base. The upper end of the connecting rod extends into the lower cover plate and the mass upper base in sequence and is threadedly connected to the mass upper base. The lower mass also includes a mass lower base and a fastening nut, the fastening nut is sleeved on the connecting rod and threadedly connected to the connecting rod, the mass lower base is threadedly connected to the connecting rod, and a plurality of the weight-type masses are located between the fastening nut and the mass lower base.

2. The dumbbell-type mass system cushioning material vibration transfer characteristics testing device according to claim 1, characterized in that: The upper pressure frame includes a compression beam, a compression screw, a compression plate and two column screws. The compression screw and the two column screws pass through the compression beam and are connected to the compression beam. The compression screw is located between the two column screws. The lower end of the compression screw is connected to the compression plate, and the lower ends of the two column screws are connected to the desktop workbench or the vibration table top.

3. The dumbbell-type mass system cushioning material vibration transfer characteristics testing device according to claim 1, characterized in that: It also includes a limiting column, the lower end of which is connected to the upper cover plate, and the buffer material sample between the upper pressure frame and the upper mass is sleeved on the outside of the limiting column.

4. The dumbbell-type mass system cushioning material vibration transfer characteristics testing device according to claim 1, characterized in that: A threaded hole D is provided on the side of the mass upper base, and a connecting rod upper hole is opened on the upper end of the connecting rod. The fastening screw A passes through the threaded hole D and the connecting rod upper hole in sequence to fasten the mass upper base and the connecting rod.

5. The dumbbell-type mass system cushioning material vibration transfer characteristics testing device according to claim 1, characterized in that: A threaded hole B is provided on the side of the mass lower base, and a connecting rod lower hole is opened at the lower end of the connecting rod. The fastening screw B passes through the threaded hole B and the connecting rod lower hole in sequence to fasten the mass lower base and the connecting rod.

6. The dumbbell-type mass system cushioning material vibration transfer characteristics testing device according to claim 1, characterized in that: The desktop workbench is a four-column desktop symmetrical structure, and the desktop workbench includes a workbench plane, a bottom frame and four workbench columns. The upper ends of the four workbench columns are connected to the workbench plane, and the lower ends of the four workbench columns are connected to the bottom frame. A frame ear is provided at each end of the workbench plane, and the frame ear is used to connect to the upper pressure frame. The linear bearing is provided in the top through hole of the workbench plane, and the bottom frame is connected to the vibration table surface. The bottom frame is provided with an anti-collision material limiting square hole, and the anti-collision material limiting square hole is used to place anti-collision material.

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