A large impact pneumatic load simulation device

Abstract

The invention discloses a large impact pneumatic load simulation device, which relates to the technical field of large impact pneumatic load simulation, including a flange frame, and the inner wall of the frame is provided with a central quick-opening device assembly and a quick-opening valve main gas cylinder assembly. The invention uses a set of pilot devices, which are respectively connected to the pressure charging interface and the pressure relief interface of the central control assembly through two conduits. During pressure charging, the pressure enters the central control block through the conduit and the pressure charging interface, drives the piston to move and push open the push rod and the DN80 quick-opening valve, and synchronously and quickly opens the main gas cylinder to pressurize the system. During pressure relief, the pressure passes through the pressure relief interface and then enters the pressure relief chamber composed of the upper guide sealing sleeve, the upper sealing sleeve and the central control block, drives the upper sealing sleeve to move downward, and opens the exhaust hole of the upper air cushion, and the system is depressurized. The pressure sensor records the pressure data in the main pressure chamber from the pressure charging to 1 second. After the test is completed, the sealing bolt is removed to discharge the residual gas, the DN80 quick-opening valve is reset and closed, and the piston is driven back by the push rod, and the test is completed.

Description

Technical Field

[0001] The invention relates to the technical field of large impact pneumatic load simulation, in particular to a large impact pneumatic load simulation device. Background Art

[0002] In the impact and collision environment test standards promulgated by domestic and foreign standardization organizations or institutions, the standards that the experimental equipment should meet are stipulated. In the impact environment simulation technology, the impact load test plays an important role in studying the characteristics and performance of the impacted system and improving the impact resistance of the equipment. For the explosion impact of structures such as buildings and ships, the impact of aircraft entering the water at high speed, etc., the structure is subject to impact loads. In order to assess the impact resistance of the structure, it is necessary to carry out impact experiments on the structure. Traditional impact load generating devices include impact machines, impact platforms and direct explosions. However, the pulse width of the above impact loads is relatively short, and there is no effective load application method for large pulse width loads such as aircraft entering the water at high speed. The existing related patents can only apply instantaneous impact loads, and the pulse width of the impact load does not exceed the millisecond level. For large pulse width loads such as aircraft entering the water at high speed, the pulse width reaches the order of hundreds of milliseconds.

[0003] At present, the existing impact test equipment has the disadvantages of complex operation, low safety factor, slow system response, and relatively single test impact, so it needs to be improved. Summary of the invention

[0004] Technical issues solved

[0005] The purpose of the present invention is to remedy the deficiencies of the prior art and to provide a large impact pneumatic load simulation device.

[0006] Technical Solution

[0007] To achieve the above object, the present invention provides the following technical solutions: a large impact pneumatic load simulation device, comprising a flange frame, the inner wall of the flange frame is provided with a central quick-opening device assembly, and the inner wall of the flange frame is provided with a quick-opening valve main cylinder assembly;

[0008] The flange frame is welded together by a flange plate and a reinforcing rib plate, and an opening is arranged through the middle end of the flange plate. A quick-opening valve main gas cylinder assembly is arranged between the flange plates of the flange frame through a bracket, and the quick-opening valve main gas cylinder assembly is evenly distributed in a circular symmetry.

[0009] The above-mentioned center quick-opening assembly includes a center control block, a driving piston, a pressure cover, a fixing bolt 1, a spring guide tube, an upper air bleed pad, a sealing bolt, an upper sealing cover, a second fixing bolt, an air bleed sealing sleeve, an upper sealing sleeve, a main valve spring and an upper guide sealing sleeve. The center control block is fixedly installed on the middle end of the inner wall of the flange frame, and the top surface of the center control block is fixedly connected to the upper sealing cover.

[0010] As mentioned above, the arc surface of the central control block is provided with a plurality of grooves, and the grooves are distributed in a circular array. The inner wall of the groove of the central control block is movably connected with a driving piston. The groove of the central control block is fixedly connected with a pressure cover at the groove mouth by fixing bolt 1. The top surface of the upper sealing cover is fixedly connected to the flange frame by fixing bolt 2, and the upper air cushion is fixedly connected to the upper sealing cover by fixing bolt 2.

[0011] As mentioned above, an air release sealing sleeve is placed between the upper sealing cover, the upper sealing sleeve and the gap between the upper air release cushion. The upper guide sealing sleeve is nested in the upper end of the central control block, and the top is connected to the upper air release cushion. The upper guide sealing sleeve is covered with an upper sealing sleeve on the outside, and eight main valve springs are connected under the upper sealing sleeve. The main valve springs are placed in a spring guide tube, and the spring guide tube is nested in the eight grooves of the central control block.

[0012] The above-mentioned quick-opening valve main gas cylinder assembly includes a gas cylinder, an upper end cover 1, an upper end cover 2, a DN80 quick-opening valve seat, an ND80 quick-opening valve, a locking nut, a connecting assembly and a gas assembly. The gas cylinder is fixedly installed between the flange plates of the flange frame through a bracket. One end of the gas cylinder is fixedly connected with the upper end cover 1, and three mounting holes are respectively penetrated on the top surface of the upper end cover 1, and a gas assembly is arranged on the inner wall of the mounting hole.

[0013] As mentioned above, the other end of the gas cylinder is fixedly installed with an upper end cover 2, the arc surface of the upper end cover 2 is fixedly connected to the inner wall of the flange frame through a support frame, and the upper end cover 2 is threadedly connected with a locking nut, the locking nut is locked to the surface of the support frame of the upper end cover 2, an opening is penetrated through the surface of the upper end cover 2, and a DN80 quick-opening valve seat is fixedly installed on the inner wall of the opening, an ND80 quick-opening valve is movably installed on the inner wall of the DN80 quick-opening valve seat, an installation groove is provided on the side of the ND80 quick-opening valve, and a connecting component is provided on the inner wall of the installation groove.

[0014] As mentioned above, the connecting assembly includes a push rod and a slow-opening spring. One end of the push rod is fixedly installed on the inner wall of the ND80 quick-opening valve installation groove. The push rod is nested in the DN80 quick-opening valve seat. One end of the slow-opening spring is connected to the outer edge of the push rod, and the slow-opening spring covers the push rod. The other end of the slow-opening spring is against the ND80 quick-opening valve seat.

[0015] As mentioned above, the push rod is movably connected to one end of the driving piston.

[0016] As mentioned above, the gas assembly includes a G1 / 4 pressure measuring joint, a pressure sensor and a G1 / 4 pressure charging joint. The G1 / 4 pressure measuring joint is fixedly installed on the inner wall of one of the mounting holes of the upper end cover, the pressure sensor is fixedly installed on the inner wall of one of the mounting holes of the upper end cover, and the G1 / 4 pressure charging joint is fixedly installed on the inner wall of one of the mounting holes of the upper end cover.

[0017] As mentioned above, two air ports are respectively provided through the bottom surface of the central control block, and both are fixedly connected with an air guide pipe.

[0018] Beneficial effects:

[0019] Compared with the prior art, the large impact aerodynamic load simulation device has the following beneficial effects:

[0020] 1. The present invention is provided with a central control block, a driving piston, a gland, a fixing bolt, a spring guide tube, an upper guide sealing sleeve, an upper sealing sleeve, an upper air release cushion, a sealing bolt, an upper sealing cover, a main valve spring, a gas cylinder, an upper end cover 1, an upper end cover 2, a DN80 quick-opening valve seat, an ND80 quick-opening valve, a push rod, a slow-opening spring, a G1 / 4 pressure measuring joint, a pressure sensor and a G1 / 4 charging joint. The present invention utilizes a set of pilot devices, which are respectively connected to the charging interface and the pressure relief interface at the bottom of the central control component through two guide tubes. When the charging is turned on, the pneumatic pilot device is instantly turned on, and the pressure enters the central control block through the guide tube and the charging interface of the central control block. , and then drive the piston to move to push open the push rod and DN80 quick-opening valve, and quickly open the main gas cylinder synchronously to pressurize the system. After a delay of 0.65 seconds, the pneumatic pilot device passes through another conduit and the pressure relief interface of the central control block, and the pressure enters the central control block, and then enters the pressure relief chamber composed of the upper guide sealing sleeve, the upper sealing sleeve and the central control block, driving the upper sealing sleeve to move downward, and the exhaust hole of the upper air cushion opens, the system is depressurized, and the pressure sensor records the pressure data in the main pressure chamber from the start of pressurization to 1 second. After the test is completed, remove the sealing bolt to discharge the residual gas, the DN80 quick-opening valve is reset and closed, and the piston is driven back by the push rod, and the test is completed.

[0021] Other advantages, objectives and features of the present invention will be set forth in part in the following description and, in part, will be apparent to those skilled in the art based on an examination of the following or may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the present invention viewed from above;

[0024] Figure 3 It is a front view structural schematic diagram of the present invention;

[0025] Figure 4 It is a rear view structural schematic diagram of the present invention;

[0026] Figure 5 It is a front cross-sectional structural schematic diagram of the present invention;

[0027] Figure 6 It is a bottom view structural schematic diagram of the present invention.

[0028] In the figure: 1. flange frame; 2. center control block; 3. drive piston; 4. gland; 5. fixing bolt 1; 6. spring guide tube; 7. upper sealing sleeve; 8. upper guide sealing sleeve; 9. venting sealing sleeve; 10. upper venting cushion; 11. sealing bolt; 12. upper sealing cover; 13. main valve spring; 14. gas cylinder; 15. upper end cover 1; 16. upper end cover 2; 17. DN80 quick-opening valve seat; 18. ND80 quick-opening valve; 19. push rod; 20. slow-opening spring; 21. G1 / 4 pressure measuring joint; 22. pressure sensor; 23. G1 / 4 charging joint; 24. locking nut; 25. fixing bolt 2. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0030] like Figure 1-6 As shown, the present invention provides a technical solution: a large impact pneumatic load simulation device, comprising a flange frame 1, the inner wall of the flange frame 1 is provided with a central quick-opening device assembly, and the inner wall of the flange frame 1 is provided with a quick-opening valve main gas cylinder assembly;

[0031] The flange frame 1 is welded together by a flange and a reinforcing rib plate, and an opening is provided through the middle end of the flange. A quick-opening valve main gas cylinder assembly is provided between the flanges of the flange frame 1 through a bracket, and the quick-opening valve main gas cylinder assembly is evenly distributed in a circular symmetry.

[0032] According to the overall structure of the device, two conduits are respectively connected to the pressure charging interface and the pressure relief interface at the bottom of the central control component. When the pressure is charged, the pneumatic pilot device is instantly opened, and the pressure enters the central control block 2 through the conduit and the pressure charging interface of the central control block 2, thereby driving the piston 3 to move and open the push rod 19 and the DN80 quick-opening valve 18, and synchronously and quickly open the main gas cylinder 14 to pressurize the system. After a delay of 0.65 seconds, the pneumatic pilot device enters the central control block 2 through another conduit and the pressure relief interface of the central control block 2, and then enters the pressure relief chamber composed of the upper guide sealing sleeve 8, the upper sealing sleeve 7 and the central control block 2, driving the upper sealing sleeve 7 to move downward, and the exhaust hole of the upper air cushion 10 is opened, and the system Pressure relief, the pressure sensor 22 records the pressure data in the main pressure chamber from the time the pressure is charged to 1 second. After the test is completed, the sealing bolt 11 is removed to discharge the residual gas, the DN80 quick-opening valve 18 is reset and closed, and the piston 3 is driven back by the push rod 19. The test is completed, so that according to the different working conditions required by the system, the gas cylinder 14 uses different inflation pressure values, and monitors the pressure data of each part online, thereby realizing the gas load generation and loading under multiple states. Moreover, since the flange frame 1 adopts a welded combination form and the pressure bearing strength of the overall structure is improved by reinforcing ribs, the layout of the gas cylinder 14 group is symmetrically distributed on the circumference, and the impact force of the external pressure charging and depressurization process is borne by the flange frame 1 itself, without any lateral force to the outside.

[0033] like Figure 1-5 As shown, the central quick-opening assembly includes a central control block 2, a driving piston 3, a pressure cover 4, a fixing bolt 1 5, a spring guide tube 6, an upper air release cushion 10, a sealing bolt 11, an upper sealing cover 12, a fixing bolt 25, an air release sealing sleeve 9, an upper sealing sleeve 7, a main valve spring 13 and an upper guide sealing sleeve 8. The central control block 2 is fixedly installed on the middle end of the inner wall of the flange frame 1, and the top surface of the central control block 2 is fixedly connected with the upper sealing cover 12. A plurality of grooves are provided on the arc surface of the central control block 2, and the grooves are distributed in a circular array. The inner wall of the groove of the central control block 2 is movably connected with the driving piston 3, and the groove notch of the central control block 2 The pressure cover 4 is fixedly connected with the upper sealing cover 12 by fixing bolts 1 5, the top surface of the upper sealing cover 12 is fixedly connected with the flange frame 1 by fixing bolts 25, the upper degassing cushion 10 is fixedly connected with the upper sealing cover 12 by fixing bolts 25, and a degassing sealing sleeve 9 is placed between the gap between the upper sealing cover 12 and the upper degassing cushion 10, the upper guide sealing sleeve 8 is nested in the upper end of the central control block 2, and the top is connected to the upper degassing cushion 10, the upper guide sealing sleeve 8 is covered with an upper sealing sleeve 7 on the outside, and eight main valve springs 13 are connected to the lower part of the upper sealing sleeve 7, the main valve springs 13 are placed in the spring guide tube 6, and the spring guide tube 6 is nested in the eight grooves of the central control block 2.

[0034] The central control block 2, the driving piston 3, the pressure cover 4, the fixing bolt 5, the spring guide tube 6, the upper degassing cushion 10, the sealing bolt 11, the upper sealing cover 12, the main valve spring 13, the spring guide tube 6, the upper sealing sleeve 7, the upper guide sealing sleeve 8 and the degassing sealing sleeve 9 are arranged, so that the central control block 2 can be pressurized. After the pressurization, the driving piston 3 can move in the groove body of the central control block 2, and then push open the push rod 19 and the DN80 quick-opening valve 18, and simultaneously open the main gas cylinder 14 to pressurize the system. When the pressure is released, the pressure enters the central control block 2 through the pressure relief interface of the central control block 2, and then enters the pressure relief chamber composed of the upper guide sealing sleeve 8, the upper sealing sleeve 7 and the central control block 2, drives the upper sealing sleeve 7 to move downward, and the exhaust hole of the upper degassing cushion 10 is opened, and the system is depressurized. After the test is completed, the sealing bolt 11 is removed so that the central control block 2 can discharge the remaining gas, and the upper sealing sleeve 7, the upper guide sealing sleeve 8 and the degassing sealing sleeve 9 can keep the seal when the pressure is not released.

[0035] like Figure 1-5 As shown, the quick-opening valve main gas cylinder assembly includes a gas cylinder 14, an upper end cover 15, an upper end cover 2 16, a DN80 quick-opening valve seat 17, an ND80 quick-opening valve 18, a locking nut 24, a connecting assembly and a gas assembly. The gas cylinder 14 is fixedly installed between the flange plates of the flange frame 1 through a bracket. One end of the gas cylinder 14 is fixedly connected to the upper end cover 15. Three mounting holes are respectively penetrated on the top surface of the upper end cover 15, and a gas assembly is arranged on the inner wall of the mounting hole.

[0036] As mentioned above, the other end of the gas cylinder 14 is fixedly installed with an upper end cover 16, the arc surface of the upper end cover 16 is fixedly connected to the inner wall of the flange frame 1 through a support frame, and the upper end cover 16 is threadedly connected with a locking nut 24, the locking nut 24 is locked on the surface of the support frame of the upper end cover 16, and the surface of the upper end cover 16 is penetrated with an opening, and a DN80 quick-opening valve seat 17 is fixedly installed on the inner wall of the opening, and an ND80 quick-opening valve 18 is movably installed on the inner wall of the DN80 quick-opening valve seat 17, and the ND80 quick-opening valve 18 is movably installed on the inner wall of the DN80 quick-opening valve seat 17. A mounting groove is provided on the side of the quick-opening valve 18, and a connecting assembly is provided on the inner wall of the mounting groove, the connecting assembly includes a push rod 19 and a slow-opening spring 20, one end of the push rod 19 is fixedly installed on the inner wall of the mounting groove of the ND80 quick-opening valve 18, the push rod 19 is nested in the DN80 quick-opening valve seat 17, one end of the slow-opening spring 20 is connected to the outer edge of the push rod 19, and the slow-opening spring 20 covers the push rod 19, the other end of the slow-opening spring 20 is against the ND80 quick-opening valve seat 17, and the push rod 19 is connected to one end of the driving piston 3.

[0037] By means of the arranged gas cylinder 14, upper end cover 1 15, upper end cover 2 16, DN80 quick-opening valve seat 17, ND80 quick-opening valve 18, locking nut 24, push rod 19 and slow-opening spring 20, the push rod 19 can be driven to move when the driving piston 3 moves, so that the ND80 quick-opening valve 18 of the DN80 quick-opening valve seat 17 is opened, and the main gas cylinder 14 is opened synchronously to pressurize the system, and the arrangement of the slow-opening spring 20 can prevent the push rod 19 from moving too fast.

[0038] like Figure 3-4 As shown, the gas assembly includes a G1 / 4 pressure measuring joint 21, a pressure sensor 22 and a G1 / 4 pressure charging joint 23. The G1 / 4 pressure measuring joint 21 is fixedly installed on the inner wall of one of the mounting holes of the upper end cover 15, the pressure sensor 22 is fixedly installed on the inner wall of one of the mounting holes of the upper end cover 15, and the G1 / 4 pressure charging joint 23 is fixedly installed on the inner wall of one of the mounting holes of the upper end cover 15.

[0039] By setting up the G1 / 4 pressure measuring joint 21, pressure sensor 22 and G1 / 4 charging joint 23, the G1 / 4 pressure measuring joint 21, pressure sensor 22 and G1 / 4 charging joint 23 can cooperate with each other to detect the current pressure value of the gas cylinder 14 and transmit it to the display screen of the control device.

[0040] like Figure 6 As shown, two air ports are respectively provided through the bottom surface of the central control block 2, and both are fixedly connected with an air guide pipe.

[0041] Through the air duct of the central control block 2, the central control block 2 can be pressurized and depressurized by connecting the air duct to the pressure charging and depressurization devices respectively.

[0042] Working principle: through two conduits, they are connected to the charging interface and the pressure relief interface at the bottom of the central control assembly respectively. When the pressure is turned on, the pneumatic pilot device is instantly turned on, and the pressure enters the central control block 2 through the conduit and the charging interface of the central control block 2, and then drives the piston 3 to move and open the push rod 19 and the DN80 quick-opening valve 18, and simultaneously quickly opens the main gas cylinder 14 to pressurize the system. After a delay of 0.65 seconds, the pneumatic pilot device enters the central control block 2 through another conduit and the pressure relief interface of the central control block 2, and then enters the upper guide sealing sleeve 8 and the upper sealing sleeve 7 In the pressure relief chamber formed with the central control block 2, the upper sealing sleeve 7 is driven to move downward, the exhaust hole of the upper air cushion 10 is opened, the system is depressurized, and the pressure sensor 22 records the pressure data in the main pressure chamber from the start of pressurization to 1 second. After the test is completed, the sealing bolt 11 is removed to discharge the residual gas, the DN80 quick-opening valve 18 is reset and closed, and the piston 3 is driven back by the push rod 19. The test is completed, and different inflation pressure values ​​are selected for the gas cylinder 14 according to different working conditions required by the system, and the pressure data of each part are monitored online, thereby realizing gas load generation and loading under multiple states.

[0043] It should be noted that, in this article, the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected", and "connected" should be understood in a broad sense. For example, "installed" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a mechanical connection or an electrical connection; "connected" can be a direct connection, an indirect connection through an intermediate medium, or a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large impact aerodynamic load simulation device, comprising a flange frame (1), characterized in that: The inner wall of the flange frame (1) is provided with a central quick-opening device assembly, and the inner wall of the flange frame (1) is provided with a quick-opening valve main gas cylinder assembly; The flange frame (1) is formed by welding a flange plate and a reinforcing rib plate, and an opening is provided through the middle end of the flange plate. A quick-opening valve main gas cylinder assembly is provided between the flange plates of the flange frame (1) via a bracket, and the quick-opening valve main gas cylinder assembly is evenly distributed in a circumferentially symmetrical manner. The central quick-opening device assembly comprises a central control block (2), a driving piston (3), a pressure cover (4), a fixing bolt 1 (5), a spring guide tube (6), an upper air release cushion (10), a sealing bolt (11), an upper sealing cover (12), a fixing bolt 2 (25), an air release sealing sleeve (9), an upper sealing sleeve (7), a main valve spring (13) and an upper guide sealing sleeve (8); the central control block (2) is fixedly mounted on the middle end of the inner wall of the flange frame (1); and the top surface of the central control block (2) is fixedly connected to the upper sealing cover (12); The quick-opening valve main gas cylinder assembly comprises a gas cylinder (14), an upper end cover 1 (15), an upper end cover 2 (16), a DN80 quick-opening valve seat (17), an ND80 quick-opening valve (18), a locking nut (24), a connecting assembly and a gas assembly. The gas cylinder (14) is fixedly mounted between flange plates of the flange frame (1) via a bracket. One end of the gas cylinder (14) is fixedly connected to the upper end cover 1 (15). Three mounting holes are respectively provided on the top surface of the upper end cover 1 (15), and a gas assembly is provided on the inner wall of the mounting hole. The two conduits are respectively connected to the pressure charging interface and the pressure relief interface at the bottom of the central control assembly. When the pressure is charged, the pneumatic pilot device is instantly opened, and the pressure enters the central control block (2) through the conduit and the pressure charging interface of the central control block (2), thereby driving the piston (3) to move and open the push rod (19) and the DN80 quick-opening valve (18), and synchronously and quickly open the main gas cylinder (14) to pressurize the system. After a delay of 0.65 seconds, the pneumatic pilot device enters the central control block (2) through another conduit and the pressure relief interface of the central control block (2), and then enters the pressure relief chamber formed by the upper guide sealing sleeve (8), the upper sealing sleeve (7) and the central control block (2), driving the upper sealing sleeve (7) to move downward, and the exhaust hole of the upper air cushion (10) is opened, and the system is depressurized.

2. A large impact pneumatic load simulation device according to claim 1, characterized in that: The arc surface of the central control block (2) is provided with a plurality of grooves, and the grooves are distributed in a circular array. The inner wall of the groove of the central control block (2) is movably connected to a driving piston (3). The groove opening of the groove of the central control block (2) is fixedly connected to a pressure cover (4) via a fixing bolt 1 (5). The top surface of the upper sealing cover (12) is fixedly connected to the flange frame (1) via a fixing bolt 2 (25). The upper air release pad (10) is fixedly connected to the upper sealing cover (12) via a fixing bolt 2 (25). The top surface of the upper air release pad (10) is threadedly connected to a sealing bolt (11) at the air port.

3. A large impact pneumatic load simulation device according to claim 2, characterized in that: A deflation sealing sleeve (9) is placed between the gap between the upper sealing cover (12) and the upper deflation cushion (10); the upper guide sealing sleeve (8) is nested in the upper end of the central control block (2) and connected to the upper deflation cushion (10) at the top; an upper sealing sleeve (7) is sleeved on the outer side of the upper guide sealing sleeve (8); eight main valve springs (13) are connected below the upper sealing sleeve (7); the main valve springs (13) are placed in a spring guide tube (6); and the spring guide tube (6) is nested in eight grooves of the central control block (2).

4. A large impact pneumatic load simulation device according to claim 1, characterized in that: The other end of the gas cylinder (14) is fixedly mounted with an upper end cover (16), the arc surface of the upper end cover (16) being fixedly connected to the inner wall of the flange frame (1) via a support frame, and the upper end cover (16) is threadedly connected with a locking nut (24), the locking nut (24) being locked to the support frame surface of the upper end cover (16), an opening being provided through the surface of the upper end cover (16), and a DN80 quick-opening valve seat (17) being fixedly mounted on the inner wall of the opening, an ND80 quick-opening valve (18) being movably mounted on the inner wall of the DN80 quick-opening valve seat (17), a mounting groove being provided on the side of the ND80 quick-opening valve (18), and a connecting component being provided on the inner wall of the mounting groove.

5. The large impact pneumatic load simulation device according to claim 1, characterized in that: The connecting assembly comprises a push rod (19) and a slow-opening spring (20), one end of the push rod (19) is fixedly mounted on the inner wall of the mounting groove of the ND80 quick-opening valve (18), the push rod (19) is nested in the DN80 quick-opening valve seat (17), one end of the slow-opening spring (20) is connected to the outer edge of the push rod (19), and the slow-opening spring (20) covers the push rod (19), and the other end of the slow-opening spring (20) abuts against the ND80 quick-opening valve seat (17).

6. A large impact pneumatic load simulation device according to claim 1, characterized in that: The push rod (19) is movably connected to one end of the driving piston (3).

7. A large impact pneumatic load simulation device according to claim 3, characterized in that: The gas assembly comprises a G1 / 4 pressure measuring joint (21), a pressure sensor (22) and a G1 / 4 pressure charging joint (23); the G1 / 4 pressure measuring joint (21) is fixedly mounted on the inner wall of one of the mounting holes of the upper end cover (15); the pressure sensor (22) is fixedly mounted on the inner wall of one of the mounting holes of the upper end cover (15); and the G1 / 4 pressure charging joint (23) is fixedly mounted on the inner wall of one of the mounting holes of the upper end cover (15).

8. The large impact pneumatic load simulation device according to claim 1, characterized in that: Two air ports are respectively provided through the bottom surface of the central control block (2), and are both fixedly connected to an air guide pipe.

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