A large pulse width waveform generating device

Abstract

The application provides a large pulse width waveform generating device, comprising a waveform generator and a waveform pulse width regulator, wherein the waveform pulse width regulator is arranged below the waveform generator and comprises a buffer base, a sealed cylinder sleeve, a piston assembly and a waveform bearing table; the sealed cylinder sleeve is fixed on the buffer base, and the upper end panel of the sealed cylinder sleeve is provided with a through hole; the piston assembly comprises a piston rod and a wave adjusting spring; the lower end of the piston rod is located in the sealed cylinder sleeve, the upper end of the piston rod is fixedly connected with the waveform bearing table above the sealed cylinder sleeve after penetrating out of the sealed cylinder sleeve through the through hole, and the outer peripheral wall of the piston rod is in contact with the inner peripheral wall of the through hole; the upper end of the wave adjusting spring is sleeved on the lower end of the piston rod, and the lower end of the wave adjusting spring is arranged on the bottom panel of the sealed cylinder sleeve or the bottom panel of the buffer base; the device has simple and compact structure, is convenient to debug, is convenient to install and transform, and can realize the test function expansion of the drop table at low cost.

Description

Technical Field

[0001] This invention belongs to the field of impact test design, and relates to the design technology of drop test platform impact test device, specifically to a large pulse width waveform generator. Background Technology

[0002] The drop test platform is a testing device widely used in industries such as aviation, weaponry, aerospace, shipbuilding, rail transportation, and automobiles. It uses a cylindrical rubber damping pad with a cone head or synthetic plastic to make a waveform generator. Under the action of impact force, it uses the damping effect of materials and structure to form an impact waveform with a certain magnitude and pulse width, verifying the equipment's ability to withstand large impact peak values ​​and pulse width characteristics.

[0003] However, due to the inherent properties of rubber or synthetic plastic materials, it is currently difficult to obtain impact test waveforms with values ​​greater than 100g and pulse widths exceeding 11ms. Furthermore, the commonly used method of extending the pulse width by adding felt pads is not easy to achieve the required impact test waveform. Moreover, even if the value can meet or exceed the requirement, the pulse width will become narrower.

[0004] Meanwhile, the combination of damping pads and felt pads of different thicknesses, along with the selection of drop impact height and velocity, increases the number of parameters required for testing and debugging, increasing the difficulty of debugging and extending the debugging cycle, resulting in a significant reduction in testing efficiency. Furthermore, high magnitude and wide pulse width place higher demands on the impact height and impact velocity of the drop platform itself, increasing the rebound speed and height of the platform, which has a greater impact on the electromagnetic brake emergency stop components of the equipment, accelerating the equipment failure rate. Summary of the Invention

[0005] To address the technical problems of existing waveform generators, such as difficulty in obtaining large pulse widths (wavelength ≥ 11ms) under large-scale impacts, numerous test parameters, high debugging difficulty, long debugging cycle, low test efficiency, and high equipment failure rate, this invention discloses a large pulse width waveform generator. The large pulse width waveform generator includes a waveform generator and a waveform pulse width adjuster. The waveform pulse width adjuster is located below the waveform generator and includes a buffer base, a sealed cylinder liner, a piston assembly, and a waveform support platform.

[0006] The sealing cylinder sleeve is fixed on the buffer base, and the upper end panel of the sealing cylinder sleeve is provided with a through hole; the piston assembly includes a piston rod and a wave adjusting spring, the lower end of the piston rod is located inside the sealing cylinder sleeve, and the upper end of the piston rod passes through the through hole and exits the sealing cylinder sleeve and is fixedly connected to the wave bearing platform above it, and the outer peripheral wall of the piston rod contacts the inner peripheral wall of the through hole.

[0007] The upper end of the wave-adjusting spring is sleeved on the lower end of the piston rod, and the lower end of the wave-adjusting spring is set on the bottom panel of the sealing cylinder liner or the bottom panel of the buffer base.

[0008] Furthermore, the sealing cylinder liner is filled with compressed gas. The sealing cylinder liner includes an outer cylinder liner and an inner cylinder liner. The outer cylinder liner is fixed on the buffer base, and the upper end panel of the outer cylinder liner has the through hole. The inner cylinder liner is disposed inside the outer cylinder liner and communicates with the outer cylinder liner.

[0009] The center lines of the outer cylinder liner, the inner cylinder liner, and the piston assembly coincide. The upper end of the piston rod passes through the inner cylinder liner and the through hole in sequence and then exits the outer cylinder liner. The lower end of the wave-adjusting spring is disposed on the bottom panel of the inner cylinder liner.

[0010] Furthermore, the outer cylinder liner is equipped with intake and exhaust valves and a pressure gauge.

[0011] Furthermore, the bottom panel of the inner cylinder liner has an air hole that communicates with the outer cylinder liner, and the diameter of the wave regulating spring is larger than the diameter of the air hole.

[0012] In an improved embodiment, the sealing cylinder liner further includes a compressed air rebound structure located below the air hole and disposed on the bottom panel of the sealing cylinder liner or on the bottom panel of the sealing cylinder liner.

[0013] The compressed air rebound structure includes a rubber pad with a conical protrusion at its center. The conical protrusion has a recessed hole that is opposite to the position of the air hole. The upper surface of the conical protrusion has a gap with the bottom panel of the inner cylinder liner.

[0014] Furthermore, the inner cylinder liner is provided with a resistance delay and shock buffer assembly, which includes a permanent magnet and a magnetic ring. The permanent magnet is sleeved and fixed at the lower end of the piston rod, and the magnetic ring is disposed on the bottom panel inside the inner cylinder liner. The magnetic properties of the corresponding surfaces of the permanent magnet and the magnetic ring are the same.

[0015] Preferably, the magnetic ring consists of two semi-circular permanent magnets.

[0016] Furthermore, the upper edge of the inner cylinder liner is provided with a raised edge, the raised edge is provided with a mounting hole and a groove, a sealing ring is provided in the groove, and the bolt passes through the mounting hole to fix the inner cylinder liner to the outer cylinder liner.

[0017] Furthermore, the wave-adjusting spring is made of non-magnetic stainless steel, and the sealing cylinder liner is made of non-magnetic material.

[0018] Furthermore, the piston rod is provided with a hollow cavity.

[0019] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above-mentioned technical solutions adopted in the embodiments of this specification include at least the following: the large pulse width waveform generator designed in this invention, by installing the original waveform generator on the waveform carrier platform of the waveform pulse width regulator, can compress the wave adjustment spring by moving the piston rod of the piston assembly into the sealed cylinder liner, so as to increase the pulse width and obtain a large pulse width waveform.

[0020] Meanwhile, based on the impact requirements of different pulse width waveforms, compressed gas is introduced into the sealed cylinder liner to create a certain air pressure value, thereby reducing equipment debugging parameters during large pulse width tests and improving test efficiency.

[0021] Furthermore, the design of the compressed air rebound structure and the resistance delay buffer component results in a longer damping buffer time after impact, a smaller rebound height and rebound speed of the drop platform, less damage to the equipment's brake system, and an improved service life of the equipment. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a perspective view of the waveform pulse width modulator in the large pulse width waveform generator disclosed in an embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional view of the waveform pulse width modulator in the large pulse width waveform generator disclosed in an embodiment of the present invention.

[0025] Figure 3 This is a perspective view of the piston rod disclosed in an embodiment of the present invention;

[0026] Figure 4 This is a cross-sectional view of the piston rod disclosed in an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the buffer base disclosed in an embodiment of the present invention;

[0028] The components include: 1. Buffer base; 2. Sealing cylinder liner; 3. Piston assembly; 4. Waveform bearing platform; 5. Threaded connector; 11. Sealing plate; 12. Sealing rubber ring; 21. Outer cylinder liner; 22. Inner cylinder liner; 211. Intake and exhaust valves; 212. Pressure gauge; 221. Air hole; 23. Compressed air rebound structure; 231. Rubber pad; 232. Conical protrusion; 233. Concave hole; 24. Permanent magnet; 25. Magnetic ring; 26. Protective sleeve; 31. Piston rod; 311. Plunger; 312. Cylindrical cone head; 32. Adjusting wave spring. Detailed Implementation

[0029] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0030] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features of the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] This invention provides a large pulse width waveform generator, which includes a waveform generator and a waveform pulse width modulator, wherein the waveform pulse width modulator is disposed below the waveform generator.

[0032] See Figure 1 and Figure 2 As shown, the waveform pulse width adjuster includes a buffer base 1, a sealing cylinder liner 2, a piston assembly 3, and a waveform support platform 4. The sealing cylinder liner 2 is fixed to the buffer base 1, and its upper end panel has a through hole. The piston assembly 3 includes a piston rod 31 and a wave-adjusting spring 32. The lower end of the piston rod 31 is located inside the sealing cylinder liner 2, and the upper end of the piston rod 31 passes through the through hole and exits the sealing cylinder liner 2, where it is fixedly connected to the waveform support platform 4 above it. The outer peripheral wall of the piston rod 31 contacts the inner peripheral wall of the through hole.

[0033] See Figure 1 and Figure 2As shown, the upper end of the wave-adjusting spring 32 is sleeved on the lower end of the piston rod 31, and the lower end of the wave-adjusting spring 32 is disposed on the bottom panel of the sealing cylinder liner 2 or the bottom panel of the buffer base 1. In specific implementation, when the sealing cylinder liner 2 has a bottom panel, the lower end of the wave-adjusting spring 32 is disposed on the sealing cylinder liner 2. When the lower end of the sealing cylinder liner 2 is an open structure, the sealing cylinder liner 2 is fixed to the buffer base 1 by bolts, and in this case, the lower end of the wave-adjusting spring 32 is disposed on the buffer base 1.

[0034] In the specific implementation of the above embodiments, the sealing cylinder liner 2 is used to guide and limit the movement of the piston rod 31 of the piston assembly 3. The waveform pulse width adjustment is achieved by the compression of the adjusting spring 32 by the piston rod 31. When a drop test is conducted using the large pulse width waveform generator of the above embodiments, the waveform generator applies a downward force to the waveform pulse width adjuster when it is impacted. At this time, the piston rod 31 moves into the sealing cylinder liner 2 along the through hole, compressing the adjusting spring 32 to obtain a large pulse width waveform.

[0035] In an optional embodiment, compressed gas can be introduced into the sealed cylinder liner 2 according to experimental requirements. The pulse width can be increased by the combined action of the compressed gas and the wave-adjusting spring 32, resulting in a large-pulse-width impact waveform. In this embodiment, the waveform pulse width adjustment is achieved by superimposing the compressed gas in the sealed cylinder liner 2 on the basis of the wave-adjusting spring 32 and the piston rod 31. In specific implementation, compressed gas with a certain pressure can be introduced into the sealed cylinder liner 2 according to the pulse width adjustment requirements.

[0036] In an optional embodiment of the sealing cylinder liner 2, see [link to embodiment]. Figure 1 and Figure 2 As shown, the sealing cylinder liner 2 includes an outer cylinder liner 21 and an inner cylinder liner 22. The outer cylinder liner 21 is fixed to the buffer base 1, and the upper end panel of the outer cylinder liner 21 is provided with the through hole. The inner cylinder liner 22 is disposed inside the outer cylinder liner 21, and the inner cylinder liner 22 communicates with the outer cylinder liner 21. In a specific implementation, the lower edge of the outer cylinder liner 21 can be fixed to the buffer base 1 by two opposing screws, and a sealing rubber ring is compressed on the contact surface of the two to achieve a seal.

[0037] See Figure 1 and Figure 2 As shown, the center lines of the outer cylinder liner 21, the inner cylinder liner 22 and the piston assembly 3 coincide. The upper end of the piston rod 31 passes through the inner cylinder liner 22 and the through hole and then exits the outer cylinder liner 21. The lower end of the wave regulating spring 32 is set on the bottom panel of the inner cylinder liner 22.

[0038] In an optional embodiment, to facilitate the introduction of a set amount of compressed gas into the sealing cylinder liner 2 according to the tuning requirements, so that the sealing cylinder liner 2 has a certain pressure, see [reference needed]. Figure 2 As shown, an intake and exhaust valve 211 and a pressure gauge 212 are provided on the outer cylinder liner 21. The intake and exhaust valve 211 and the pressure gauge 212 are respectively threaded and fixed on the outer cylinder liner 21. Compressed gas can be input or discharged through the intake and exhaust valve 211, and the pressure condition inside the sealed cylinder liner 2 can be observed in real time during the test through the pressure gauge 212.

[0039] In an optional embodiment of the sealed cylinder liner 2, during the test, in order to allow the compressed gas inside the inner cylinder liner 22 to be discharged to the outer cylinder liner 21, see [reference needed]. Figure 2 As shown, the bottom panel of the inner cylinder liner 22 has an air hole 221 that communicates with the outer cylinder liner 21. At the same time, the diameter of the wave regulating spring 32 is larger than the diameter of the air hole 221, which can prevent the wave regulating spring 32 from falling out of the inner cylinder liner 22.

[0040] In an optional embodiment of the sealing cylinder liner 2, see [link to embodiment]. Figure 2 As shown, the sealing cylinder liner 2 also includes a compressed air rebound structure 23, which is located below the air hole 221 and is disposed on the bottom panel of the sealing cylinder liner 2. The compressed air rebound structure 23 is used to increase the damping rebound effect of the compressed air when the compressed gas in the inner cylinder liner 22 is squeezed out to the outer cylinder liner 21 by the piston rod 31.

[0041] See Figure 2 and Figure 5 As shown, the compressed air rebound structure 23 includes a rubber pad 231, with a conical protrusion 232 at its center. A concave hole 233, corresponding to the position of the air hole 221, is machined on the upper surface of the conical protrusion 232. A gap exists between the upper surface of the conical protrusion 232 and the bottom panel of the inner cylinder liner 22. In this embodiment, the waveform pulse width adjustment is achieved by further superimposing the concave hole 233 in the compressed air rebound structure 23 on top of the wave-adjusting spring 32, piston rod 31, and compressed gas. In specific implementation, firstly, compressed gas with a certain pressure can be introduced into the sealed cylinder liner 2 according to the pulse width adjustment requirements. Secondly, compressed air rebound structures 23 with concave holes 233 of different depths and diameters can be selected to achieve waveform pulse width adjustment.

[0042] In an optional embodiment of the sealing cylinder liner 2, the inner cylinder liner 22 is provided with a resistance delay and buffer assembly, see [link to relevant documentation]. Figure 2As shown, the resistance delay and impact buffer assembly includes a permanent magnet 24 and a magnetic ring 25. The permanent magnet 24 is sleeved and fixed at the lower end of the piston rod 31, and the magnetic ring 25 is disposed on the bottom panel inside the inner cylinder liner 22. The magnetic properties of the corresponding surfaces of the permanent magnet 24 and the magnetic ring 25 are the same, and the piston assembly 3 is resisted from moving downward by utilizing the principle of like poles repelling each other.

[0043] For specific implementation, see Figure 3 and Figure 4 As shown, the piston rod 31 is made of high-strength stainless steel with low magnetic properties. The plunger 311, which performs piston movement, is located in the middle of the piston rod. The plunger 311 is located inside the sealing cylinder liner 2 (or the inner cylinder liner 22 of the sealing cylinder liner 2). Two grooves are designed on the outer peripheral wall of the plunger 311 for installing O-ring seals. The gap between the inner diameter wall of the plunger 311 and the inner cylinder liner 22 should be controlled between 0.3mm and 0.5mm. Excessive gap will cause the O-ring seal to bear a large air pressure, resulting in pressure leakage. At the same time, four threaded blind holes are designed on the lower end face of the plunger 311 to facilitate the fastening installation of the magnetic ring 25.

[0044] The cylindrical conical head 312 at one end of the plunger 311 is used to transmit and apply impact force. The shape of the cylindrical conical head 312 facilitates a slow increase in air pressure during the compression process. The upper end of the wave-adjusting spring 32 is sleeved on the cylindrical conical head 312. The other end of the plunger 311 is designed as a threaded end with a notch milled on it to facilitate the installation of the threaded connector 5. (See [reference]) Figure 2 As shown, by installing the piston rod 31 connected with the threaded connector 5 on the lower end face of the wave bearing platform 4, the threaded connector 5 can increase the force-bearing area of ​​the upper end of the plunger 311. The threaded connector 5 is made of stainless steel, has an oblong shape, and is designed with a threaded hole that matches the piston rod 31. The fit clearance is H7 / G7.

[0045] Meanwhile, the permanent magnet 24 is manufactured using a sintering process, designed as a hollow ring with multiple mounting holes on its surface, and galvanized for corrosion protection. Due to the sintering process, it cannot withstand strong impacts; therefore, please refer to [the relevant documentation / reference needed]. Figure 3 and Figure 4 As shown, a protective sleeve 26 is installed on the permanent magnet 24. The protective sleeve 26 is made of soft copper and has a countersunk hole for mounting the permanent magnet 24. The protective sleeve 26 and the permanent magnet 24 are fixed to the lower end face of the plunger 311 of the piston rod 31 by countersunk screws.

[0046] Preferably, the magnetic ring 25 and the permanent magnet 24 are manufactured using the same process. For ease of installation and replacement, the magnetic ring 25 consists of two semi-circular permanent magnets. The magnetic ring 25 is designed as two semi-circular rings and placed inside the inner cavity of the inner cylinder liner, eliminating the need for fixing the magnetic ring 25. The inner diameter of the magnetic ring 25 is greater than the maximum outer diameter of the wave-regulating spring 32. The sum of the thicknesses of the magnetic ring 25, the permanent magnet 24, and the protective sleeve 26 is less than or equal to the spring height of the wave-regulating spring 32 in its maximum compressed state.

[0047] In an optional embodiment of the sealing cylinder liner 2, see [link to embodiment]. Figure 1 and Figure 2 As shown, the upper edge of the inner cylinder liner 22 is provided with a raised edge, and the raised edge is provided with a mounting hole and a groove. A sealing ring is provided in the groove. The bolt passes through the mounting hole to fix the inner cylinder liner 22 to the outer cylinder liner 21.

[0048] Furthermore, the wave-adjusting spring 32 is made of non-magnetic stainless steel, and the sealing cylinder liner 2 is made of non-magnetic material. The two ends of the wave-adjusting spring 32 are joined by 1 / 2 turns. The inner diameter of the wave-adjusting spring 32 should be larger than the conical diameter of the piston rod 31, and the outer diameter should be smaller than the inner diameter of the magnetic ring 25. The minimum height after compression should be greater than the sum of the thicknesses of the magnetic ring 25, the permanent magnet 24, and the protective sleeve 26. The maximum height of the wave-adjusting spring 32 should ensure that the piston assembly 3 has a prestress of 10% of its maximum elasticity after being installed in the inner cylinder liner 22. Simultaneously, to ensure a faster response to impacts, the initial natural frequency of the wave-adjusting spring 32 should be greater than 500Hz.

[0049] Further, see Figure 4 As shown, the piston rod 31 has a hollow cavity. By setting the hollow cavity, the weight of the piston rod 31 can be reduced as much as possible while ensuring rigidity.

[0050] In an optional embodiment, see Figure 5 As shown, the buffer base 1 includes a sealing plate 11. The outer periphery of the sealing plate 11 is provided with a sealing rubber ring 12 that contacts the lower opening face of the outer cylinder sleeve 21 in the sealing cylinder sleeve 2. The sealing rubber ring 12 can achieve sealing and fixing of the sealing cylinder sleeve 2. During installation, one or two threaded holes can be machined on the outer periphery of the sealing plate 11, and the outer cylinder sleeve 21 can be fixed to the sealing plate 11 with screws. Simultaneously, the aforementioned compressed air rebound structure 23 can also be fixed to the sealing plate 11. The hollow center of the recess 233 on the compressed air rebound structure 23 is collinear with the center of the outer cylinder sleeve 21.

[0051] In an optional embodiment, the waveform support platform 4 serves as a tooling for supporting the existing waveform generator. It is made of aluminum alloy plate with a thickness of not less than 30mm and has a groove in the middle that is the same shape as the threaded connector 5. The groove depth is greater than 1 / 2 the plate thickness. In use, the waveform support platform 4 is placed on the threaded connector 5.

[0052] The embodiments of the present invention achieve the following technical effects: The large pulse width waveform generator designed in this invention, by installing the original waveform generator on the waveform support platform of the waveform pulse width regulator, can increase the pulse width and obtain a large pulse width waveform by moving the piston rod of the piston assembly into the sealed cylinder liner to compress the wave adjusting spring. The waveform pulse width regulator of the above embodiments of the present invention has the following advantages:

[0053] 1. By employing the rebound force of the wave-adjusting spring 32, the repulsive force of the combined magnetic ring 25 and the permanent magnet 24, and the buffering effect of the compressed air rebound structure 23, the impact duration can be extended. Simultaneously, by adjusting the pressure of the compressed gas within the sealed cylinder liner 2, a variable-damping air spring is formed, enabling adjustable and widened impact pulse widths within a certain range. Compared to adding felt pads, the operating parameters are easier to quantify, and the repeatability under the same test conditions is better. Testing has shown that the device of this invention can generate waveforms with pulse widths exceeding 11 ms.

[0054] 2. The shock wave can be widened by the initial pressure of the compressed gas in the sealed cylinder liner 2. The adjustment method is simple and quick, with few adjustment parameters, which improves the efficiency of test debugging and reduces the test cost.

[0055] 3. The multi-damping structure formed by the compressed air rebound structure 23, magnetic ring 25 and permanent magnet 24 can extend the action time of the drop platform, get rid of the equipment's limitation on the waveform generator, broaden the range of impact test conditions, improve the capabilities of existing equipment, and has low modification costs.

[0056] 4. The device of the present invention is easy to install or disassemble, and has little impact on the smooth conduct of other tests on the original drop platform.

[0057] 5. The device of the present invention can extend the impact time of large values, reduce the rebound, and lower the rebound speed during brake braking, making the equipment operation safer and reducing the failure rate of the equipment.

[0058] Obviously, those skilled in the art should understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Various modifications and variations of the embodiments of the present invention are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A large pulse width waveform generating apparatus comprising a waveform generator, characterized by, Waveform pulse width regulator is arranged below the waveform generator, including buffer base (1), sealing cylinder sleeve (2), piston assembly (3) and waveform bearing platform (4); The sealing cylinder sleeve (2) is fixed on the buffer base (1), including outer cylinder sleeve (21) and inner cylinder sleeve (22), the bottom panel of the inner cylinder sleeve (22) is provided with air hole (221) communicated with the outer cylinder sleeve (21), and the upper end panel of the sealing cylinder sleeve (2) is provided with through hole; The piston assembly (3) includes piston rod (31) and wave adjusting spring (32), the lower end of the piston rod (31) is located in the sealing cylinder sleeve (2), the upper end of the piston rod (31) is fixedly connected with the waveform bearing platform (4) above the sealing cylinder sleeve (2) after penetrating out of the sealing cylinder sleeve (2) through the through hole, and the outer peripheral wall of the piston rod (31) is in contact with the inner peripheral wall of the through hole. The sealing cylinder sleeve (2) includes compressed air spring structure (23), the compressed air spring structure (23) is located below the air hole (221) and is arranged on the bottom panel of the sealing cylinder sleeve (2) or the bottom panel of the sealing cylinder sleeve (2); The compressed air spring structure (23) includes rubber pad (231), the center of the rubber pad (231) is provided with conical convex (232), the upper of the conical convex (232) is processed with recess (233) corresponding to the position of the air hole (221), and the upper plane of the conical convex (232) has a gap with the bottom panel of the inner cylinder sleeve (22). The upper end of the wave adjusting spring (32) is sleeved on the lower end of the piston rod (31), and the lower end of the wave adjusting spring (32) is arranged on the bottom panel of the sealing cylinder sleeve (2) or the bottom panel of the buffer base (1).

2. The apparatus according to claim 1, wherein The sealing cylinder sleeve (2) is filled with compressed gas, the outer cylinder sleeve (21) is fixed on the buffer base (1), and the upper end panel of the outer cylinder sleeve (21) is provided with the through hole; The inner cylinder sleeve (22) is arranged in the outer cylinder sleeve (21), and the inner cylinder sleeve (22) is communicated with the outer cylinder sleeve (21); The center lines of the outer cylinder sleeve (21), the inner cylinder sleeve (22) and the piston assembly (3) coincide, the upper end of the piston rod (31) penetrates out of the outer cylinder sleeve (21) in sequence through the inner cylinder sleeve (22) and the through hole, and the lower end of the wave adjusting spring (32) is arranged on the bottom panel of the inner cylinder sleeve (22).

3. The apparatus according to claim 2, wherein The outer cylinder sleeve (21) is provided with air inlet and outlet valve (211) and pressure gauge (212).

4. The apparatus according to claim 2, wherein The diameter of the wave adjusting spring (32) is greater than the diameter of the air hole (221).

5. The apparatus according to claim 2, wherein The inner cylinder sleeve (22) is provided with resistance delay impact assembly, the resistance delay impact assembly includes permanent magnet (24) and magnetic ring (25), the permanent magnet (24) is sleeved and fixed on the lower end of the piston rod (31), the magnetic ring (25) is arranged on the inner bottom panel of the inner cylinder sleeve (22), and the magnetic properties of the corresponding surfaces of the permanent magnet (24) and the magnetic ring (25) are same.

6. The apparatus according to claim 5, wherein The magnetic ring (25) is composed of two semicircular permanent magnets.

7. The apparatus according to claim 2, wherein An upper end edge of the inner cylinder sleeve (22) is provided with a convex edge, the convex edge is provided with a mounting hole and a groove, a sealing ring is arranged in the groove, and a bolt passes through the mounting hole to fix the inner cylinder sleeve (22) on the outer cylinder sleeve (21).

8. The apparatus according to claim 1, wherein The wave modulation spring (32) is made of non-magnetic stainless steel material, and the sealing cylinder sleeve (2) is made of non-magnetic material.

9. The apparatus according to claim 1, wherein The piston rod (31) is provided with a hollow cavity.

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