Air source control system for pneumatic impact table

Abstract

The invention relates to the technical field of half-sine impact tests, in particular to an air source control system for a pneumatic impact table, which comprises a base, an impacted seat, an impact seat, a waveform generator, a gravitational acceleration amplification seat and an impact cylinder, the impact seat is arranged above the top surface of the impacted seat; the waveform generator is mounted on the top surface of the impact seat; the gravitational acceleration amplification seat is arranged above the top surface of the impact seat; the impact cylinder vertically penetrates through the air storage cavity, an upper valve body and a pneumatic brake are arranged at the top end of the impact cylinder, a lower valve body is arranged at the bottom end of the impact cylinder, and a piston and a piston rod are arranged in a cylinder barrel; the upper valve body is communicated with the upper part in the cylinder barrel; the pneumatic brake can brake the piston rod; the lower valve body is communicated with the lower part in the cylinder barrel; the top of the piston rod is fixedly connected with the striker; the lower valve body can communicate with the gas storage cavity through a first gas control pipeline; the upper valve body can communicate with the gas storage cavity through a second gas control pipeline; the pneumatic brake can communicate with the air storage cavity through a third air control pipeline.

Description

Technical Field

[0001] The invention relates to the technical field of semi-sine impact testing, and in particular to an air source control system for a pneumatic impact table. Background Art

[0002] When the aircraft's mechanical structure and its electronic components are working, they are often exposed to dynamic environments such as turbulence, explosion, shock and vibration. Among them, shock refers to a high-level input force pulse acting on the equipment in a short period of time, including mechanical shock, explosion separation shock and ballistic shock. Half-sine shock is a common form of shock.

[0003] Usually, electronic components are used as test pieces, and the half-sine shock test adopts the drop shock form or the pneumatic shock form. Both forms use the impact seat to impact the impact seat, which can only obtain a small impact magnitude, usually below 5000g (g is the acceleration of gravity), while the Hopkinson bar can obtain an impact magnitude of about 100000g, with a continuous pulse width of about 0.05ms, which is only suitable for shock testing of small-sized products.

[0004] For some slightly larger electronic components on aircraft, when using a pneumatic impact table to perform a half-sine impact test, the impact magnitude is required to be above 20,000g and the pulse width is required to be above 0.10ms. Therefore, how to provide an air source control system compatible with the pneumatic impact table has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] The invention provides an air source control system for a pneumatic impact table, which is used to solve the problem of how to provide an air source control system adapted to the pneumatic impact table.

[0006] The present invention provides an air source control system for a pneumatic impact table, comprising:

[0007] A base having an air storage cavity formed therein;

[0008] An impact seat is installed on the top surface of the base;

[0009] An impact seat, arranged above the top surface of the impact seat;

[0010] A waveform generator is installed on the top surface of the impact seat;

[0011] The gravity acceleration amplifying seat is arranged above the top surface of the impact seat, and the top surface is suitable for installing the test piece;

[0012] The impact cylinder is vertically arranged in the air storage chamber, with an upper valve body and a pneumatic brake at the top end, a lower valve body at the bottom end, and a piston and a piston rod in the cylinder barrel; the upper valve body is connected with the upper part of the interior of the cylinder barrel; the pneumatic brake can brake the piston rod; the lower valve body is connected with the lower part of the interior of the cylinder barrel; the top end of the piston rod is fixedly connected with the bottom end of the impact seat; the lower valve body can be connected with the air storage chamber through the first air control pipeline; the upper valve body can be connected with the air storage chamber through the second air control pipeline; the pneumatic brake can be connected with the air storage chamber through the third air control pipeline.

[0013] In some embodiments, the first air control circuit includes:

[0014] A first one-way valve, the inlet of which is connected to the air storage chamber;

[0015] an isolation valve, an inlet of which is connected to an outlet of the first one-way valve;

[0016] a first proportional valve, the inlet of which is connected to the outlet of the isolation valve;

[0017] a first boost valve, the inlet of which is communicated with the outlet of the first proportional valve, and the outlet of which is communicated with the air inlet of the lower valve body;

[0018] The first pressure relief valve has an inlet connected to the air outlet of the lower valve body.

[0019] In some embodiments, the first air control circuit further comprises:

[0020] An emergency valve, the inlet of which is connected to the outlet of the isolation valve;

[0021] a throttle valve, the inlet of which is connected to the outlet of the emergency valve;

[0022] The second one-way valve has an inlet connected to the outlet of the throttle valve, and an outlet connected to the air inlet of the lower valve body.

[0023] In some embodiments, the first air control circuit further comprises:

[0024] The accumulator has an inlet connected to the outlet of the first one-way valve, and an outlet connected to the inlet of the isolation valve.

[0025] In some embodiments, the second gas control circuit includes:

[0026] a second proportional valve, the inlet of which is connected to the air storage chamber;

[0027] a second boost valve, the inlet of which is communicated with the outlet of the second proportional valve, and the outlet of which is communicated with the air inlet of the upper valve body;

[0028] a second pressure relief valve, the inlet of which is connected to the air outlet of the upper valve body;

[0029] The first manual pump has an inlet connected to the air storage chamber, and an outlet connected to the air inlet of the upper valve body.

[0030] In some embodiments, the third gas control circuit includes:

[0031] a third boost valve, the inlet of which is communicated with the air storage chamber, and the outlet of which is communicated with the air inlet of the pneumatic brake;

[0032] a third pressure relief valve, the inlet of which is connected to the air outlet of the pneumatic brake;

[0033] The second manual pump has an inlet communicated with the air storage chamber, and an outlet communicated with the air inlet of the pneumatic brake.

[0034] In some embodiments, it also includes:

[0035] a third one-way valve, the inlet of which is connected to the air storage chamber;

[0036] A filter, the inlet of which is connected to the outlet of the third one-way valve, and the outlet of which is respectively connected to the first air control pipeline, the second air control pipeline, and the third air control pipeline;

[0037] The overflow valve has an inlet connected to the outlet of the third one-way valve.

[0038] In some embodiments, it also includes:

[0039] A first pressure detection sensor is installed on the first air control pipeline;

[0040] A second pressure detection sensor is installed on the second air control pipeline;

[0041] The third pressure detection sensor is installed on the third air control pipeline.

[0042] In some of these embodiments, the ratio of the weight of the impact mount to the weight of the gravity acceleration amplification mount is greater than ten.

[0043] In some embodiments, it also includes:

[0044] A bracket, mounted on the top surface of the impact seat;

[0045] The elastic suspension member has an axis arranged vertically, a bottom end of which is mounted on the top surface of the gravity acceleration amplifying seat, and a top end of which is mounted on the top end of the bracket;

[0046] A guide rod, the axis of which is vertically arranged, the bottom end of which is fixedly connected to the impact seat, and the top end of which is fixedly connected to the top end of the bracket;

[0047] A guide hole for the guide rod to pass through is formed on the gravity acceleration amplifying seat;

[0048] An impact panel, mounted on the bottom surface of the impact seat;

[0049] A shock absorber is mounted on the bottom surface of the base;

[0050] The base is mounted on the bottom surface of the shock absorber.

[0051] The beneficial effects of the present invention are as follows: the air source control system for the pneumatic impact table of the present invention is provided with a collision seat, an impact seat, a waveform generator, a gravity acceleration amplifier seat and an impact cylinder, and the compressed gas in the air storage chamber flows into the lower part of the interior of the cylinder barrel through the first air control pipeline and the lower valve body, driving the piston and the piston rod to move upward, so as to drive the impact seat, the waveform generator and the gravity acceleration amplifier seat to move upward. When the bottom surface of the impact seat is higher than the top surface of the collision seat by a certain height, the first air control pipeline is disconnected from the lower valve body, and the third air control pipeline is connected to the pneumatic brake, and the pneumatic brake brakes the piston rod and restricts the piston rod from continuing to move upward. When performing an accelerated impact test, the second air control pipeline is connected to the upper valve body, and the compressed gas in the air storage chamber flows into the upper part of the interior of the cylinder barrel through the second air control pipeline and the upper valve body. At the same time, the compressed gas located in the lower part of the interior of the cylinder barrel is released through the lower valve body. Then, the third air control pipeline is disconnected from the pneumatic brake, and the pneumatic brake releases pressure to release the piston rod. The compressed gas located in the upper part of the cylinder drives the piston and the piston rod to move downward, thereby driving the impact seat and the waveform generator to move downward. After the impact seat collides with the impacted seat, it turns to move upward and collides with the gravity acceleration amplifier seat that is moving downward, so that the speed change of the gravity acceleration amplifier seat increases, thereby increasing the impact magnitude. On the whole, with the help of the air source control system for the pneumatic impact table to carry out a half-sine impact test, the impact magnitude can reach more than 20,000g, and the pulse width can reach more than 0.10ms, which is suitable for some slightly larger electronic components on the aircraft for half-sine impact testing. The rising and falling sections of the measured waveform will not be distorted, and the test data meets the expected requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a structural schematic diagram of some specific embodiments of an air source control system for a pneumatic impact table of the present invention;

[0053] Figure 2 It is a schematic diagram of the working principles of some specific embodiments of an air source control system for a pneumatic impact table of the present invention.

[0054] In the attached drawings, 110, base; 111, lower seat body; 1111, air storage chamber; 112, upper seat body; 113, top cover; 120, impact seat; 130, impact seat; 140, waveform generator; 150, gravity acceleration amplifying seat; 160, impact cylinder; 161, upper valve body; 162, pneumatic brake; 163, lower valve body; 164, piston; 165, piston rod; 171, first air control pipeline; 1711, first one-way valve; 1712, isolation valve; 1713, first proportional valve; 1714, first boost valve; 1715, first pressure relief valve; 1716, emergency valve; 1717, throttle valve; 1718, second one-way valve; 1719, accumulator; 172, second air control pipeline; 1721, second proportional valve; 1722, second boost valve; 1723, second pressure relief valve; 1724, first manual pump; 173, third air control pipeline; 1731, third boost valve; 1732, third pressure relief valve; 1733, second manual pump; 181, third one-way valve; 182, filter; 183, overflow valve; 184, first pressure detection sensor; 185, second pressure detection sensor; 186, third pressure detection sensor; 191, bracket; 192, elastic suspension; 193, guide rod; 194, impact panel; 195, shock absorber; 196, base. DETAILED DESCRIPTION

[0055] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than 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.

[0056] As described in the background technology, for some slightly larger electronic components on aircraft, when using a pneumatic impact table to perform a half-sine impact test, the impact magnitude is required to be above 20,000 g and the pulse width is required to be above 0.10 ms. Therefore, how to provide an air source control system compatible with the pneumatic impact table has become a technical problem that needs to be solved urgently by those skilled in the art.

[0057] To solve the above problems, refer to Figure 1 and Figure 2The present invention provides an air source control system for a pneumatic impact table, comprising a base 110, a hit seat 120, an impact seat 130, a waveform generator 140, a gravity acceleration amplifier seat 150 and an impact cylinder 160. An air storage chamber 1111 is formed inside the base 110, and compressed gas is stored in the air storage chamber 1111. The hit seat 120 is installed on the top surface of the base 110. The hit seat 120 is supported by the base 110. The impact seat 130 is arranged above the top surface of the hit seat 120 so as to be movable up and down. The waveform generator 140 is installed on the top surface of the impact seat 130, which is conducive to the gravity acceleration amplifier seat 150 generating an impact waveform with a required pulse width when being hit by the impact seat 130. The gravity acceleration amplifier seat 150 is arranged above the top surface of the impact seat 130, and the top surface is suitable for installing test pieces such as electronic components of spacecraft. The impact cylinder 160 is vertically penetrated in the air storage chamber 1111. An upper valve body 161 and a pneumatic brake 162 are provided at the top of the impact cylinder 160, a lower valve body 163 is provided at the bottom, and a piston 164 and a piston rod 165 are provided in the cylinder. The upper valve body 161 is communicated with the upper part of the interior of the cylinder. The pneumatic brake 162 can brake the piston rod 165. The lower valve body 163 is communicated with the lower part of the interior of the cylinder. The top of the piston rod 165 is fixedly connected to the bottom end of the impact seat 130 by bolts. The lower valve body 163 can be communicated with the air storage chamber 1111 through the first air control pipeline 171. The upper valve body 161 can be communicated with the air storage chamber 1111 through the second air control pipeline 172. The pneumatic brake 162 can be communicated with the air storage chamber 1111 through the third air control pipeline 173.

[0058] The process and principle of the half-sine shock test with the help of the air source control system for the pneumatic shock table are as follows:

[0059] First, the impact seat 130, the waveform generator 140 and the gravity acceleration amplifier seat 150 move upward with the piston rod 165 of the impact cylinder 160. In this process, the first air control line 171 is connected to the lower valve body 163. The compressed gas in the air storage chamber 1111 flows into the lower part of the cylinder through the first air control line 171 and the lower valve body 163, driving the piston 164 and the piston rod 165 to move upward, so as to drive the impact seat 130, the waveform generator 140 and the gravity acceleration amplifier seat 150 to move upward. When the bottom surface of the impact seat 130 is higher than the top surface of the impact seat 120 by a certain height, the first air control line 171 is disconnected from the lower valve body 163, and the third air control line 173 is connected to the pneumatic brake 162, and the pneumatic brake 162 brakes the piston rod 165 and limits the piston rod 165 from continuing to move upward.

[0060] Next, an accelerated impact test or a free fall impact test is performed.

[0061] When performing the accelerated impact test, the impact seat 130 and the waveform generator 140 move downward with the piston rod 165 of the impact cylinder 160, and the gravity acceleration amplifier seat 150 falls naturally. During this process, the second air control pipeline 172 is connected to the upper valve body 161, and the compressed gas in the air storage chamber 1111 flows into the upper part of the cylinder through the second air control pipeline 172 and the upper valve body 161. At the same time, the compressed gas located in the lower part of the cylinder is released through the lower valve body 163. Then, the third air control pipeline 173 is disconnected from the pneumatic brake 162, and the pneumatic brake 162 is released to release the piston rod 165. The compressed gas located in the upper part of the cylinder drives the piston 164 and the piston rod 165 to move downward, so as to drive the impact seat 130 and the waveform generator 140 to move downward. Since the impact seat 130 and the waveform generator 140 are subject to their own gravity and the traction force from the piston rod 165, while the gravity acceleration amplifier seat 150 is only subject to its own gravity, the descending speed of the impact seat 130 and the waveform generator 140 is greater than the descending speed of the gravity acceleration amplifier seat 150. After the impact seat 130 collides with the impacted seat 120, it turns to move upward and collides with the gravity acceleration amplifier seat 150 that is moving downward, so that the speed change of the gravity acceleration amplifier seat 150 increases, thereby increasing the impact magnitude. On the whole, by using the air source control system for the pneumatic impact table to perform a half-sine impact test, the impact magnitude can reach more than 20,000g, and the pulse width can reach more than 0.10ms, which is suitable for some slightly larger electronic components on the aircraft to perform a half-sine impact test. The rising section and the falling section of the measured waveform will not be distorted, and the test data meets the expected requirements.

[0062] When the free fall impact test is performed, the impact seat 130, the waveform generator 140, the piston rod 165 of the impact cylinder 160, and the gravity acceleration amplifying seat 150 fall naturally. In this process, the compressed gas located in the lower part of the cylinder barrel is released through the lower valve body 163. Then, the third air control pipeline 173 is disconnected from the pneumatic brake 162, the pneumatic brake 162 is depressurized, the piston rod 165 is released, and the impact seat 130, the waveform generator 140, the piston rod 165 of the impact cylinder 160, and the gravity acceleration amplifying seat 150 fall naturally.

[0063] It should be noted that the collision process between the impact seat 130 and the impacted seat 120 complies with the law of conservation of momentum. The collision process between the impact seat 130 and the gravity acceleration amplifier seat 150 also complies with the law of conservation of momentum. When performing the acceleration impact test, it is assumed that the mass of the impact seat 130 is m1, the mass of the gravity acceleration amplifier seat 150 is m2, the movement stroke of the piston rod 165 of the impact cylinder 160 is L, the diameter of the cylinder barrel of the impact cylinder 160 is R, the pressure of the impact cylinder 160 is P, and the initial pressure in the air storage chamber 1111 is PC , the volume of the air storage chamber 1111 is V C , the speed of the impact seat 130 when colliding with the impacted seat 120 is V0. Assume that before the impact seat 130 collides with the gravity acceleration amplifying seat 150, the speed of the impact seat 130 is V1, and the speed of the gravity acceleration amplifying seat 150 is V2; after the impact seat 130 collides with the gravity acceleration amplifying seat 150, the speed of the impact seat 130 is V1', and the speed of the gravity acceleration amplifying seat 150 is V2'.

[0064] When the impact seat 130 collides with the impacted seat 120:

[0065]

[0066] According to the law of conservation of kinetic energy:

[0067]

[0068] According to collision theory:

[0069] m1v1+m2v2=m1v1+m212

[0070] Assuming that the collision time between the impact seat 130 and the gravity acceleration amplifying seat 150 is Δt, and the magnitude of acceleration generated by the gravity acceleration amplifying seat 150 is G, it can be calculated that:

[0071]

[0072] If a half-sine waveform is to be generated, the stiffness K of the waveform generator 140 should satisfy:

[0073]

[0074] According to the above formula, the peak value and duration of the ideal impact acceleration spectrum can be obtained.

[0075] Preferably, the impact seat 120 is detachably mounted on the top surface of the base 110 by bolts, so as to facilitate the disassembly and assembly of the impact seat 120. The waveform generator 140 is detachably mounted on the top surface of the impact seat 130 by bolts, so as to facilitate the disassembly, replacement and installation of the waveform generator 140.

[0076] Preferably, the material of the impact seat 120 is iron, which has high strength. The material of the impact seat 130 and the gravity acceleration amplifying seat 150 is aluminum alloy.

[0077] Preferably, the waveform generator 140 includes a rubber spring and a metal spring. The metal spring is embedded in the rubber spring, and its cross section is a grid structure, and is integrally formed with the rubber spring. In this way, it is beneficial for the gravity acceleration amplifier 150 to generate a semi-sine waveform with an impact magnitude of more than 30,000 g and a pulse width of more than 0.10 ms. Assume that the stiffness of the waveform generator formed by the rubber spring and the metal spring connected in parallel is K2, and the compressive stiffness of the metal spring is K j , the stiffness of the rubber spring is K x , the elastic modulus of metal material is E j , the section moment of inertia of the metal material is I j , X 2 dA j It is the integral of the product of the area of ​​each microelement of the metal material and the square of the distance from each microelement to a specified axis on the cross section. The material of the rubber spring is rubber material, and the elastic modulus of the rubber material is E a2 , the cross-sectional area of ​​the rubber spring is A x , the axial height of the rubber spring is H2, the correction coefficient of the rubber material is β2, β2 is between 0-1, then:

[0078]

[0079] Preferably, the volume of the air storage chamber 1111 is 2 to 3 times the volume of the interior of the cylinder barrel of the impact cylinder 160 .

[0080] Preferably, the gravity acceleration amplifier 150 is an inverted polygonal pyramid structure. The impact seat 130 is an inverted polygonal pyramid structure. It should be noted that the structural strength of the gravity acceleration amplifier 150 needs to be checked according to the highest test level, and its natural frequency should be greater than 1 / 2Δt. An acceleration sensor is installed on the top surface of the gravity acceleration amplifier 150.

[0081] Preferably, the ratio of the weight of the impact seat 130 to the weight of the gravity acceleration amplifying seat 150 is greater than 10, which is conducive to the gravity acceleration amplifying seat 150 obtaining a higher acceleration G value, thereby achieving a larger impact magnitude.

[0082] In some practical applications, the top surface size of the gravity acceleration amplifier 150 is 150mm×150mm or more. Some slightly larger electronic components are installed on the top surface of the gravity acceleration amplifier 150 by bolts. The bore of the impact cylinder 160 is 250mm, the movement stroke of the piston rod 165 is 0.85m, the volume of the air storage chamber 1111 is 3 times the volume inside the cylinder of the impact cylinder 160, the weight of the impact seat 130 is about 135kg, and the weight of the gravity acceleration amplifier 150 is about 12kg. Before conducting a half-sine impact test, with the help of the piston rod 165, the bottom surface of the impact seat 130 is 0.85m higher than the top surface of the impact seat 120, and the air storage chamber 1111 is pressurized to 0.75MPa. When the semi-sine acceleration impact test is performed, the gravity acceleration amplifier 150 generates a semi-sine waveform with an impact magnitude of 30,000 g and a pulse width of 0.12 ms.

[0083] Specifically, in the exemplary embodiment, the first gas control pipeline 171 includes a first one-way valve 1711, an isolation valve 1712, a first proportional valve 1713, a first boost valve 1714, a first pressure relief valve 1715, an emergency valve 1716, a throttle valve 1717, a second one-way valve 1718 and an accumulator 1719. The inlet of the first one-way valve 1711 is connected to the gas storage chamber 1111 to prevent the compressed gas from flowing back. The inlet of the isolation valve 1712 is connected to the outlet of the first one-way valve 1711. The inlet of the first proportional valve 1713 is connected to the outlet of the isolation valve 1712 to adjust the flow rate. The inlet of the first boost valve 1714 is connected to the outlet of the first proportional valve 1713, and the outlet is connected to the air inlet of the lower valve body 163. The inlet of the emergency valve 1716 is connected to the outlet of the isolation valve 1712. The inlet of the throttle valve 1717 is connected to the outlet of the emergency valve 1716. The inlet of the second one-way valve 1718 is connected to the outlet of the throttle valve 1717, and the outlet is connected to the air inlet of the lower valve body 163 to prevent the compressed gas from flowing back to the throttle valve 1717. The first one-way valve 1711, the isolation valve 1712, the first proportional valve 1713 and the first boost valve 1714 can build up pressure for the lower part of the cylinder. When the first proportional valve 1713 or the first boost valve 1714 fails, the first one-way valve 1711, the isolation valve 1712, the emergency valve 1716, the throttle valve 1717 and the second one-way valve 1718 can also be used to build up pressure for the lower part of the cylinder. The inlet of the first pressure relief valve 1715 is connected to the outlet of the lower valve body 163, so that the lower part of the cylinder can be relieved through the lower valve body 163. The inlet of the accumulator 1719 is connected to the outlet of the first one-way valve 1711, and the outlet is connected to the inlet of the isolation valve 1712. When the gas supply source fails or is in a non-working state, the accumulator 1719 can supply compressed gas to the first gas control pipeline 171, but due to the presence of the first check valve 1711, the accumulator 1719 cannot supply compressed gas to the second gas control pipeline 172 / third gas control pipeline 173. The accumulator 1719 serves as a backup gas source.

[0084] Preferably, the isolation valve 1712, the first proportional valve 1713, the first boost valve 1714 and the first pressure relief valve 1715 are solenoid valves for electrical control, while the emergency valve 1716 and the throttle valve 1717 are manual valves for manual opening.

[0085] Specifically, in the exemplary embodiment, the second air control pipeline 172 includes a second proportional valve 1721, a second boost valve 1722, a second pressure relief valve 1723 and a first manual pump 1724. The inlet of the second proportional valve 1721 is communicated with the air storage chamber 1111. The inlet of the second boost valve 1722 is communicated with the outlet of the second proportional valve 1721, and the outlet is communicated with the air inlet of the upper valve body 161. The pressure can be built up for the upper part of the interior of the cylinder barrel through the second proportional valve 1721 and the second boost valve 1722. The inlet of the second pressure relief valve 1723 is communicated with the air outlet of the upper valve body 161, so that the upper part of the interior of the cylinder barrel is relieved through the upper valve body 161. The inlet of the first manual pump 1724 is communicated with the air storage chamber 1111, and the outlet is communicated with the air inlet of the upper valve body 161. When the second proportional valve 1721 or the second boost valve 1722 fails, pressure can be built up manually for the upper part of the cylinder with the help of the first manual pump 1724 .

[0086] Preferably, the second proportional valve 1721, the second pressure-increasing valve 1722 and the second pressure-relief valve 1723 are solenoid valves for easy electrical control.

[0087] Specifically, in the exemplary embodiment, the third air control pipeline 173 includes a third boost valve 1731, a third pressure relief valve 1732 and a second manual pump 1733. The inlet of the third boost valve 1731 is communicated with the air storage chamber 1111, and the outlet is communicated with the air inlet of the pneumatic brake 162. The third boost valve 1731 can build up pressure for the pneumatic brake 162 so that the pneumatic brake 162 limits the up and down movement of the piston rod 165. The inlet of the third pressure relief valve 1732 is communicated with the air outlet of the pneumatic brake 162 to facilitate the pressure release of the pneumatic brake 162. The inlet of the second manual pump 1733 is communicated with the air storage chamber 1111, and the outlet is communicated with the air inlet of the pneumatic brake 162. When the third boost valve 1731 fails, the pneumatic brake 162 can also be built up pressure manually with the help of the second manual pump 1733.

[0088] Preferably, the third pressure-increasing valve 1731 and the third pressure-releasing valve 1732 are solenoid valves for easy electrical control.

[0089] Specifically, in the exemplary embodiment, the third one-way valve 181, the filter 182, the overflow valve 183, two first pressure detection sensors 184, the second pressure detection sensor 185, the third pressure detection sensor 186 and the controller are also included. The inlet of the third one-way valve 181 is connected to the air storage chamber 1111 to prevent the compressed gas from flowing back into the air storage chamber 1111. The inlet of the filter 182 is connected to the outlet of the third one-way valve 181, and the outlets are respectively connected to the first air control pipeline 171, the second air control pipeline 172, and the third air control pipeline 173, which can filter the compressed gas and remove impurities such as oil and water in the compressed gas. The inlet of the overflow valve 183 is connected to the outlet of the third one-way valve 181, which is used for the overflow of the compressed gas in the pipeline. One of the first pressure detection sensors 184 is installed on the connecting pipeline between the first boost valve 1714 and the lower valve body 163, and is used to detect the air pressure in the lower part of the cylinder. Another first pressure detection sensor 184 is installed on the connecting pipeline between the accumulator 1719 and the first one-way valve 1711, and is used to detect the air pressure in the accumulator 1719. The second pressure detection sensor 185 is installed on the connecting pipeline between the second boosting valve 1722 and the upper valve body 161, and is used to detect the air pressure in the upper part of the cylinder. The third pressure detection sensor 186 is installed on the connecting pipeline between the third boosting valve 1731 and the pneumatic brake 162, and is used to detect the air pressure in the pneumatic brake 162. The controller is electrically connected to each first pressure detection sensor 184, the second pressure detection sensor 185, the third pressure detection sensor 186, the isolation valve 1712, the first proportional valve 1713, the first boosting valve 1714, the first pressure relief valve 1715, the second proportional valve 1721, the second boosting valve 1722, the second pressure relief valve 1723, the third boosting valve 1731, and the third pressure relief valve 1732. The controller is provided with a human-machine interaction module. The operator inputs the commands of rise, acceleration impact and free fall impact to the controller through the human-computer interaction module. The controller can receive the air pressure values ​​obtained by each first pressure detection sensor 184, second pressure detection sensor 185 and third pressure detection sensor 186 to control whether the isolation valve 1712, first boost valve 1714, first pressure relief valve 1715, second boost valve 1722, second pressure relief valve 1723, third boost valve 1731 and third pressure relief valve 1732 are working, and control the opening of the first proportional valve 1713 and the second proportional valve 1721.

[0090] Specifically, in the exemplary embodiment, the air source control system for the pneumatic impact table further includes a bracket 191, two elastic suspension members 192, two guide rods 193, an impact panel 194, four shock absorbers 195 and a base 196. The bracket 191 includes four vertical rods and a cross beam. The bottom ends of the two vertical rods are detachably mounted on the top surface of the impact seat 130. The top ends of the two vertical rods are detachably connected to one end of the cross beam through nuts, and the top ends of the other two vertical rods are detachably connected to the other end of the cross beam through nuts. The axes of the two elastic suspension members 192 are both vertically arranged, and the bottom ends are respectively mounted on the opposite sides of the top surface of the gravity acceleration amplifier seat 150, and the top ends are respectively mounted on the opposite ends of the cross beam. Before the semi-sine impact test is performed, the bottom surface of the gravity acceleration amplifier seat 150 can be made higher than the top surface of the waveform generator 140 by means of the two elastic suspension members 192 to meet the test requirements. At the same time, the elastic suspension member 192 can prevent the gravity acceleration amplifier seat 150 from moving up and down too much. The axes of the two guide rods 193 are both vertically arranged, the bottom ends are fixedly connected to the impact seat 130 respectively, and the top ends are fixedly connected to the opposite ends of the beam respectively. The opposite sides of the gravity acceleration amplifier seat 150 are respectively formed with guide holes for the corresponding guide rods 193 to pass through. The two guide rods 193 play a restraining role on the moving direction of the gravity acceleration amplifier seat 150, ensuring that the high-speed gravity acceleration amplifier seat 150 moves up and down in the vertical direction without rotating. The impact panel 194 is detachably mounted on the bottom surface of the impact seat 130 by bolts. When performing an impact test, the impact panel 194 makes the bottom surface of the impact seat 130 evenly stressed. When damaged, only the impact panel 194 needs to be replaced, without replacing the more expensive impact seat 130, which is conducive to reducing maintenance and repair costs. The four shock absorbers 195 are detachably mounted on the four sides of the bottom surface of the lower seat body 111 of the base 110 by bolts. When performing an impact test, the shock absorbers 195 can play a shock absorbing role. The base 196 is detachably mounted on the bottom surfaces of the four shock absorbers 195 by bolts, and is used to support the shock absorbers 195, the base 110 and the impact seat 120, so that the axes of the shock absorbers 195, the base 110 and the impact seat 120 are in a vertical state.

[0091] Preferably, the material of the bracket 191 and the guide rod 193 is stainless steel, which has high rigidity and strength. The bracket 191 improves the rigidity and strength of the overall structure formed by the bracket 191, the guide rod 193 and the gravity acceleration amplifier 150.

[0092] Preferably, each elastic suspension member 192 is a spring rope.

[0093] Preferably, the middle cross-sectional diameter of each guide rod 193 is larger than the end cross-sectional diameter, which increases the contact area when the guide rod 193 is connected to the impact seat 130, eliminates the need for gaskets, and ensures the stability of the connection.

[0094] Preferably, each shock absorber 195 is a shock absorbing airbag. When the four shock absorbing airbags are inflated, the weight that can be borne should exceed at least 2 times the total weight of the impact device.

[0095] Preferably, the base 196 is made of steel or concrete.

[0096] Specifically, in the exemplary embodiment, the base 110 includes a lower body 111, an upper body 112 and a top cover 113. An air storage chamber 1111 is formed inside the lower body 111. The upper body 112 is detachably mounted on the top surface of the upper body 112 by bolts, and at least one side is provided with an air charging port connected to the air storage chamber 1111, through which compressed gas is charged into the air storage chamber 1111. The top cover 113 is detachably mounted on the top surface of the upper body 112 by bolts, and the impact seat 120 is mounted on the top surface.

[0097] Preferably, a sealing ring is provided between the top cover 113 and the upper seat body 112. A sealing ring is also provided between the upper seat body 112 and the lower seat body 111. In this way, the sealing performance of the air storage chamber 1111 is effectively improved.

[0098] Preferably, the sum of the weights of the lower seat body 111 , the upper seat body 112 and the top cover 113 is not less than 8 tons, which not only meets the requirements of the half-sine impact test but also reduces the manufacturing cost.

[0099] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0100] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0101] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0102] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0103] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An air source control system for a pneumatic impact table, characterized in that: include: A base having an air storage cavity formed therein; An impact seat is installed on the top surface of the base; An impact seat, disposed above the top surface of the impact seat; A waveform generator is mounted on the top surface of the impact seat; A gravity acceleration amplifying seat is arranged above the top surface of the impact seat, and the top surface is suitable for installing a test piece; An impact cylinder is vertically arranged in the air storage chamber, with an upper valve body and a pneumatic brake at the top end, a lower valve body at the bottom end, and a piston and a piston rod in the cylinder barrel; the upper valve body is communicated with the upper part of the interior of the cylinder barrel; the pneumatic brake can brake the piston rod; the lower valve body is communicated with the lower part of the interior of the cylinder barrel; the top end of the piston rod is fixedly connected to the bottom end of the impact seat; the lower valve body can be communicated with the air storage chamber through a first air control pipeline; the upper valve body can be communicated with the air storage chamber through a second air control pipeline; the pneumatic brake can be communicated with the air storage chamber through a third air control pipeline.

2. The air source control system for a pneumatic impact table according to claim 1, characterized in that: The first air control pipeline comprises: a first one-way valve, the inlet of which is connected to the air storage chamber; an isolation valve, the inlet of which is connected to the outlet of the first one-way valve; a first proportional valve, the inlet of which is connected to the outlet of the isolation valve; a first boost valve, the inlet of which is communicated with the outlet of the first proportional valve, and the outlet of which is communicated with the air inlet of the lower valve body; The first pressure relief valve has an inlet connected to the air outlet of the lower valve body.

3. The air source control system for a pneumatic impact table according to claim 2, characterized in that: The first air control pipeline also includes: an emergency valve, the inlet of which is connected to the outlet of the isolation valve; a throttle valve, the inlet of which is connected to the outlet of the emergency valve; The second one-way valve has an inlet connected to the outlet of the throttle valve, and an outlet connected to the air inlet of the lower valve body.

4. The air source control system for a pneumatic impact table according to claim 2, characterized in that: The first air control pipeline also includes: The accumulator has an inlet connected to the outlet of the first one-way valve, and an outlet connected to the inlet of the isolation valve.

5. The air source control system for a pneumatic impact table according to claim 1, characterized in that: The second air control pipeline comprises: a second proportional valve, the inlet of which is connected to the air storage chamber; a second boost valve, the inlet of which is communicated with the outlet of the second proportional valve, and the outlet of which is communicated with the air inlet of the upper valve body; a second pressure relief valve, the inlet of which is connected to the air outlet of the upper valve body; The first manual pump has an inlet connected to the air storage chamber and an outlet connected to the air inlet of the upper valve body.

6. The air source control system for a pneumatic impact table according to claim 1, characterized in that: The third air control pipeline comprises: a third boost valve, the inlet of which is communicated with the air storage chamber, and the outlet of which is communicated with the air inlet of the pneumatic brake; a third pressure relief valve, the inlet of which is connected to the outlet of the pneumatic brake; The second manual pump has an inlet connected to the air storage chamber and an outlet connected to the air inlet of the pneumatic brake.

7. The air source control system for a pneumatic impact table according to claim 1, characterized in that: Also includes: a third one-way valve, the inlet of which is connected to the air storage chamber; a filter, the inlet of which is connected to the outlet of the third one-way valve, and the outlet of which is respectively connected to the first air control pipeline, the second air control pipeline, and the third air control pipeline; The overflow valve has an inlet connected to the outlet of the third one-way valve.

8. The air source control system for a pneumatic impact table according to claim 1, characterized in that: Also includes: A first pressure detection sensor is installed on the first air control pipeline; A second pressure detection sensor is installed on the second air control pipeline; The third pressure detection sensor is installed on the third air control pipeline.

9. The air source control system for a pneumatic impact table according to claim 1, characterized in that: The ratio of the weight of the impact seat to the weight of the gravity acceleration amplifying seat is greater than 10.

10. The air source control system for a pneumatic impact table according to claim 1, characterized in that: Also includes: A bracket, mounted on the top surface of the impact seat; An elastic suspension member, with an axis arranged vertically, a bottom end mounted on the top surface of the gravity acceleration amplifying seat, and a top end mounted on the top of the bracket; A guide rod, the axis of which is vertically arranged, the bottom end of which is fixedly connected to the impact seat, and the top end of which is fixedly connected to the top end of the bracket; The gravity acceleration amplifying seat is formed with a guide hole for the guide rod to pass through; An impact panel, mounted on the bottom surface of the impact seat; A shock absorber is mounted on the bottom surface of the base; The base is installed on the bottom surface of the shock absorber.

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