A micro high-precision light gas gun test device and its test method

Abstract

The present invention discloses a micro high-precision light gas gun test device, which includes a high-pressure light gas supply system, a gun body unit, a loading unit, a barrel unit and a device base; the gun body unit includes a sealing plug, an air chamber, a four-way body, a pressure gauge, a solenoid valve, a gun body base and a gun body bottom plate; the loading unit includes a locking sleeve, a sealing head, a conical sealing gasket and a loading support seat; the barrel unit includes a barrel, a cover plate and a barrel support beam arranged front and back; the barrel is a capillary tube; the loading unit further includes a plurality of pull rods; the rear end of the pull rod is fixed to the loading support seat, and the front end is fixed to the barrel support beam of the barrel unit. The device of the present invention realizes the bullpup design of the micro projectile, thereby improving the speed accuracy and position accuracy of the high-speed ballistic experiment device.

Description

Technical Field

[0001] The present invention belongs to the field of foreign object damage tests for materials and structures, and relates to a test device, in particular to a micro high-precision light gas gun test device and a test method thereof. Background Art

[0002] When an aircraft is flying or taking off and landing at low altitude, its engine is prone to inhaling foreign objects such as sand and gravel, and parts. Since the rotational speed of the compressor of an aeroengine is as high as tens of thousands of revolutions per minute, when these foreign objects collide with the compressor blades, it will cause foreign object damage (FOD) to the structure. Severe FOD will cause a sharp decline in the load-bearing capacity of the structure, and such structural components often need to be directly replaced during maintenance. In practice, a more common situation is that the degree of FOD is relatively light, and the structural component can still continue to serve safely for a considerable period of time. At this time, directly replacing parts will cause great waste. Therefore, it is necessary to study the remaining performance of structures containing minor FOD. To reproduce FOD in a real environment under laboratory conditions, a high-speed projectile launching device is required. Currently, due to the characteristics of easy pressure control, convenient use, and relatively high safety of light gas guns / cannons, they are widely used in FOD research under laboratory conditions. With the in-depth study of FOD, higher requirements have been put forward for the reproduction of structural FOD: (1) Smaller projectiles and more precise ejection speeds to cause smaller and more controllable degrees of FOD. (2) Higher position accuracy to generate FOD at specific positions on the structure; (3) Movable to achieve the generation of FOD under static loading and high-temperature environments. However, the current light gas guns / cannons have a relatively large caliber (usually with a diameter greater than 10 mm). If small projectiles are to be launched, a sabot is required to support and push the projectile. The complex structure leads to a large dispersion in the speed and position of the projectile hitting the target, and it is too large in size to be moved, making it difficult to meet the current higher-precision reproduction requirements for FOD. To achieve a light gas gun for launching small projectiles, relatively high requirements are put forward for the processing of the gun barrel 41, loading, etc. At present, there is no reported micro-caliber gas gun.

[0003] Therefore, it is necessary to provide a high-precision light gas gun test device capable of launching small projectiles to accurately reproduce FOD of the engine structure. Summary of the Invention

[0004] The present invention provides a micro high-precision light gas gun test device and a test method thereof to overcome the defects of the prior art.

[0005] To achieve the above object, the present invention provides a micro high-precision light gas gun test device, which has the following features: It includes a high-pressure light gas supply system, a gun body unit, a loading unit, a barrel unit, and a device base; the gun body unit includes a sealing plug, an air chamber, a four-way body, a pressure gauge, a solenoid valve, a gun body base, and a gun body bottom plate; the four-way body is fixed on the gun body base, and the four-way body has a communicating air chamber communication hole, a solenoid valve communication hole, a pressure gauge communication hole, and an air inlet; the front end of the air chamber is communicated with the air chamber communication hole of the four-way body; the sealing plug is plugged into the rear end of the air chamber, and the sealing plug can move relative to the air chamber to adjust the volume of the sealing plug inserted into the air chamber; the pressure gauge is connected to the pressure gauge communication hole of the four-way body; the high-pressure light gas supply system is connected to the air inlet of the four-way body to input gas into the four-way body; the solenoid valve is fixed on the gun body base; the air inlet end of the solenoid valve is communicated with the solenoid valve communication hole of the four-way body; the gun body base is arranged on the gun body bottom plate and is slidably connected to the gun body bottom plate, and can slide back and forth relative to the gun body bottom plate; the gun body bottom plate is fixed on the device base; the loading unit includes a locking sleeve, a sealing head, a conical sealing gasket, and a loading support seat; the bottom of the loading support seat is fixed on the device base and is located in front of the gun body unit; the loading support seat has a support seat through hole penetrating through its front and rear; the conical sealing gasket has a conical bullet through hole penetrating through its front and rear; the conical sealing gasket is fixed on the rear side of the loading support seat, and the conical bullet through hole is aligned with the support seat through hole; the sealing head has a head air passage penetrating through its front and rear; the sealing head is arranged on the rear side of the conical sealing gasket, and the head air passage is aligned with the conical bullet through hole of the conical sealing gasket; the rear end of the sealing head is fixed and communicated with the air outlet end of the solenoid valve of the gun body unit; the locking sleeve is sleeved outside the sealing head, and the front end is detachably connected to the loading support seat, and after connection, the sealing head is pressed against the conical sealing gasket; the barrel unit includes a barrel, a cover plate, and a barrel support beam arranged front and rear; the barrel is a capillary; the barrel support beam is fixed on the device base; the upper surface of the barrel support beam has a V-shaped groove; the cover plate is located above the barrel support beam, and the lower surface of the cover plate has a V-shaped groove; the barrel is stuck between the V-shaped groove of the barrel support beam and the V-shaped groove of the cover plate, and the barrel is fixed by fixing the cover plate on the barrel support beam; the rear end of the barrel is detachably fixed in the support seat through hole of the loading support seat of the loading unit and is communicated with the conical bullet through hole of the conical sealing gasket; the loading unit further includes a plurality of tie rods; the rear ends of the tie rods are fixed to the loading support seat, and the front ends are fixed to the barrel support beam of the barrel unit.

[0006] Further, the present invention provides a micro high-precision light gas gun test device, which may also have the following features: It further includes a loading mechanism; the loading mechanism includes a core rod and a needle; the needle is a cylindrical structure with a needle tip at the front end, and the core rod can move inside the needle; first, place the projectile at the needle tip of the needle, then align the needle tip with the conical bullet through hole of the conical sealing gasket, and then push the core rod to push the projectile into the barrel.

[0007] Furthermore, the present invention provides a micro high-precision light gas gun test device, which may further have the following features: wherein, in the gun body unit, the air chamber communication hole and the solenoid valve communication hole of the four-way body are arranged on a straight line in the front-rear direction, the pressure gauge communication hole and the air inlet are perpendicular to each other, and are staggered in the front-rear direction.

[0008] Furthermore, the present invention provides a micro high-precision light gas gun test device, which may further have the following features: wherein, in the gun body unit, the gun body base includes a gun body step base and a gun body flat base, the four-way body and the solenoid valve are both fixed on the gun body step base, and the gun body step base is fixed on the gun body flat base; the gun body unit further includes a plurality of linear sliders and a plurality of guide rails; a plurality of linear sliders are fixed on the lower surface of the gun body flat base, a plurality of guide rails are fixed on the upper surface of the gun body bottom plate, the plurality of linear sliders and the plurality of guide rails are in one-to-one correspondence and match, the linear slider is slidably connected to the corresponding guide rail, and the gun body flat base is slidably connected to the gun body bottom plate through the linear slider and the guide rail; the air chamber communication hole, the solenoid valve communication hole, the pressure gauge communication hole and the air inlet of the four-way body all have internal threads, and are respectively threadedly connected to the front end of the air chamber, the air inlet end of the solenoid valve, the pressure gauge and the high-pressure light gas supply system; the sealing plug has an external thread, the rear end of the air chamber is provided with an air chamber threaded hole, and the sealing plug is threadedly connected to the air chamber threaded hole, and the volume of the sealing plug inserted into the air chamber is adjusted by rotating the sealing plug.

[0009] Furthermore, the present invention provides a micro high-precision light gas gun test device, which may further have the following features: wherein, in the loading unit, a thrust bearing is provided between the locking sleeve and the sealing head, and the thrust bearing is sleeved outside the sealing head; the locking sleeve has an internal thread, the upper part of the loading support seat has an external thread, the locking sleeve is sleeved on the sealing head, presses against the thrust bearing, and is then threadedly connected to the loading support seat. After tightening, the sealing head and the conical sealing gasket are pressed tightly.

[0010] Furthermore, the present invention provides a micro high-precision light gas gun test device, which may further have the following features: wherein, the barrel unit further includes a rubber sheet, and the rubber sheet is pasted on the surface of the V-shaped groove of the cover plate; the front end of the barrel extends out of the barrel support beam and the cover plate, and a plurality of velocity measurement through holes are provided on the side; the front end of the barrel support beam has a plurality of support beam mounting threaded holes for mounting a shooting sight; the lower surface of the barrel support beam also has a V-shaped groove.

[0011] Furthermore, the present invention provides a micro high-precision light gas gun test device, which may further have the following features: wherein, the high-pressure light gas supply system includes a high-pressure gas cylinder, a pressure reducing valve, a proportional valve and a high-pressure pipe; the high-pressure gas cylinder, the pressure reducing valve, the proportional valve and the high-pressure pipe are sequentially connected by pipe threads, and the high-pressure pipe is connected to the air inlet of the four-way body of the gun body unit, and the light gas is output from the high-pressure gas cylinder to the four-way body through the pressure reducing valve, the proportional valve and the high-pressure pipe.

[0012] Furthermore, the present invention provides a micro high-precision light gas gun test device, which may further have the following features: It further includes a solenoid valve switch system; the solenoid valve switch system includes a switch button, a DC power supply, and several wires; the wires connect the DC power supply, the switch button, and the solenoid valve of the gun body unit to form a circuit to control the solenoid valve.

[0013] Furthermore, the present invention provides a micro high-precision light gas gun test device, which may further have the following features: It further includes a computer; the computer includes a first communication line, a second communication line, and a third communication line; the first communication line is used to send a control signal to the proportional valve; the second communication line is used to obtain the chamber pressure value; the third communication line is used to send a firing signal; the logic of the computer control is as follows: Step 1, set the target chamber pressure p g , the computer sends the pressure digital signal to the high-pressure light gas supply system via the first communication line, and the sent pressure digital signal p v is 10% greater than the target chamber pressure p g ; Step 2, the digital signal of the chamber pressure p p is transmitted to the computer via the second communication line. If then it is considered that p p has reached p v , at this time the computer sends a closing signal to the high-pressure light gas supply system to stop the gas supply; Step 3, the chamber pressure p p gradually decreases as the system slowly leaks air. When , the computer sends an opening signal to the solenoid valve of the gun body unit via the third communication line, and the solenoid valve immediately opens, and the high-pressure gas pushes the projectile forward to achieve the launch of the projectile.

[0014] Furthermore, the present invention provides a micro high-precision light gas gun test device, which may further have the following features: It includes the following steps: S1, evacuation, the barrel is filled with light gas; S2, loading the projectile; S3, conducting the first test shot: set the outlet pressure of the high-pressure light gas supply system to p t1 , wait until the pressure gauge reading reaches 1.1p t1 , then close the high-pressure light gas supply system; wait for the pressure gauge reading p p0 to slowly drop to , then fire the projectile; measure the flight speed of the projectile as v t1 through the speed measurement system; S4, record the expected flight speed of the projectile as v ideal ; if v t1 >v ideal , then record the corresponding p t1 as the upper limit pressure p max ; at this time, conduct the second test shot, and the test shot pressure is 0.5p t1 , if the flight speed v t2 at this pressure is <videal Then record 0.5p t1 is the lower limit pressure p min Otherwise, it is considered that the lower limit pressure is not found, and the firing pressure is further multiplied by 0.5 until the lower limit pressure p is found min ; If v t1 < v ideal Then record the corresponding p t1 is the lower limit pressure p min ; At this time, conduct the second firing test, and the firing pressure is 2p t1 If the flight speed v at this pressure t2 > v ideal Then record 2p t1 is the upper limit pressure p max Otherwise, it is considered that the upper limit pressure is not found, and the firing pressure is further multiplied by 2 until the upper limit pressure p is found max ; Finally, the upper limit pressure p of the firing pressure is determined through this step max and the lower limit pressure p min ; S5. In order to make the speed of the fired projectile accurate enough, several firing tests are required to determine the final chamber pressure p ideal : Between the upper limit pressure p max and the lower limit pressure p min Use the bisection method to calculate the next firing pressure The flight speed of the projectile at this pressure is v ti ; If v ti > v ideal Then let p max = p ti ; Otherwise let p min = p ti ; This step determines the upper limit pressure p and the lower limit pressure p of the new firing pressure max and the lower limit pressure p min ; S6. Repeat S5 until Then let

[0015] S7. Aim the barrel at the target, load the ammunition, and pressurize and fire with p ideal as the target chamber pressure

[0016] The present invention also provides a test method for a micro high-precision light gas gun test device, having the following characteristics:

[0017] The beneficial effects of the present invention are as follows: The present invention provides a micro high-precision light gas gun test device and its test method. This device realizes the bullpup design of small projectiles, thereby improving the velocity accuracy and position accuracy of high-speed ballistic experimental devices. Specifically, this device uses a precision seamless capillary as the gun barrel. On the one hand, the capillary is a low-cost finished part, saving the high cost of machining high-precision gun barrels. On the other hand, compared with the traditional launch form with a sabot, when launching projectiles through the capillary, the complex interaction between the projectile, the sabot, and the gun / gun barrel during the flight of the projectile is eliminated, which can achieve high velocity accuracy and high position accuracy for small projectiles. The inner hole of the gun barrel can be circular, square, or other special shapes to adapt to bullets with different cross-sectional shapes, realizing the controllability of the impact posture. In order to enable the smooth application of the capillary gun barrel, the present invention designs a variety of gun barrel protection structures, including the cover plate, gun barrel support beam, pull rod, and loading support seat in the gun barrel unit. These structures can reduce the force on the gun barrel, greatly reducing the damage of the gun barrel during the test, thereby ensuring the realization of high-precision shooting tests for small projectiles. Further, this device reduces the consumption of light gas, greatly reducing the equipment usage cost; at the same time, compared with existing light gas gun / gun test devices, this device has a significant weight reduction effect and can be easily moved. In addition, the launch end and the precision seamless gun barrel are connected by a common thread. On the one hand, it can adapt to gun barrels of different specifications; on the other hand, it is very convenient to replace the vulnerable part - the gun barrel, greatly improving the maintainability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a micro high-precision light gas gun test device;

[0019] Figure 2 is a schematic exploded view of the structure of the gun body unit;

[0020] Figure 3 is a schematic structural diagram of the four-way body in the gun body unit;

[0021] Figure 4 is a sectional view of the structure and exploded structure of the loading unit;

[0022] Figure 5 is a schematic exploded view of the structure of the gun barrel unit;

[0023] Figure 6 is a schematic diagram of the loading unit and its loading process;

[0024] Figure 7 is a schematic diagram of the recoil force analysis with a pull rod (right side) and without a pull rod (left side). DETAILED DESCRIPTION OF THE INVENTION

[0025] The following will describe the specific embodiments of the present invention with reference to the accompanying drawings.

[0026] As Figure 1 shown, the present invention provides a micro high-precision light gas gun test device, which includes a high-pressure light gas supply system 1, a gun body unit 2, a loading unit 3, a barrel unit 4, a device base 5, a loading mechanism 6, a solenoid valve switch system 7 and a computer 8.

[0027] The device base 5 is an F aluminum profile, a standard aluminum profile, for assembling the whole device. The assembled device can be further assembled onto the required working platform through the device base 5 (F aluminum profile).

[0028] As Figure 2 and 3 shown, the gun body unit 2 includes a sealing plug 21, an air chamber 22, a four-way body 23, a pressure gauge 24, a solenoid valve 25, a gun body base 26 and a gun body bottom plate 27. The four-way body 23 is fixed on the gun body base 26. The four-way body 23 has a communicating air chamber connecting hole 231, a solenoid valve connecting hole 232, a pressure gauge connecting hole 233 and an air inlet 234 which are communicated. The front end of the air chamber 22 is communicated with the air chamber connecting hole 231 of the four-way body 23. The sealing plug 21 is plugged into the rear end of the air chamber 22, and the sealing plug 21 can move relative to the air chamber 22 to adjust the volume of the sealing plug 21 plugged into the air chamber 22. The pressure gauge 24 is connected to the pressure gauge connecting hole 233 of the four-way body 23 to detect the pressure inside the four-way body 23. The high-pressure light gas supply system 1 is connected to the air inlet 234 of the four-way body 23 to input gas into the four-way body 23. The solenoid valve 25 is fixed on the gun body base 26. The air inlet end of the solenoid valve 25 is communicated with the solenoid valve connecting hole 232 of the four-way body 23. The gun body base 26 is arranged on the gun body bottom plate 27 and is slidably connected to the gun body bottom plate 27, and can slide back and forth relative to the gun body bottom plate 27. The gun body bottom plate 27 is fixed on the device base 5.

[0029] Specifically, the gun body base 26 includes a gun body stepped base 261 and a gun body flat base 262. The four-way body 23 and the solenoid valve 25 are both fixed on the gun body stepped base 261, and the gun body stepped base 261 is fixed on the gun body flat base 262. The gun body unit 2 further includes three linear sliders 28 and three guide rails 29. The three linear sliders 28 are fixed on the lower surface of the gun body flat base 262, the three guide rails 29 are fixed on the upper surface of the gun body bottom plate 27, the three linear sliders 28 correspond to and match the three guide rails 29 one by one, the linear sliders 28 are slidably connected to the corresponding guide rails 29, and the gun body flat base 262 is slidably connected to the gun body bottom plate 27 through the linear sliders 28 and the guide rails 29.

[0030] The specific installation structure of the gun body unit 2 is as follows: The two first sunk holes 2611 on the gun body step base 261 are used to install the four-way body 23. Pass two screws through the two first sunk holes 2611 on the gun body step base 261 respectively, and then connect the two threaded holes 2301 at the bottom of the four-way body 23, and the installation of the four-way body 23 can be realized. The two second sunk holes 2612 on the gun body step base 261 are used to install the solenoid valve 25. Pass two screws through the two second sunk holes 2612 on the gun body step base 261 respectively, and then connect the two threaded holes 2501 at the bottom of the solenoid valve 25, and the installation of the solenoid valve 25 can be realized. Pass four screws through the four first sunk holes 2621 on the gun body flat base 262, and then screw them into the four threaded holes 2613 on the gun body step base 261, and the fixation of the gun body flat base 262 and the gun body step base 261 can be realized. Pass twelve screws through the twelve second sunk holes 2622 on the gun body flat base 262 and screw them into the threaded holes 2801 on the three linear sliders 28, and the fixation of the gun body flat base 262 and the linear sliders 28 can be realized. Pass the screws through the sunk holes 2901 on the three guide rails 29 and screw them into the threaded holes 2701 on the gun body bottom plate 27, and the installation of the guide rails 29 can be realized. Pass the screws through the sunk holes 2702 on the gun body bottom plate 27, then through the gap of the device base 5 (F aluminum profile), and finally screw them into the T-shaped nut, and the fixation of the gun body bottom plate 27 on the device base 5 (F aluminum profile) can be realized.

[0031] Among them, the air chamber communication hole 231 and the solenoid valve communication hole 232 of the four-way body 23 are arranged on a straight line in the front-rear direction. The pressure gauge communication hole 233 and the air inlet 234 are perpendicular to each other and are staggered in the front-rear direction, so that the air inlet can avoid the pressure gauge 24, and further make the pressure measurement of the pressure gauge 24 more accurate.

[0032] The air chamber communication hole 231, the solenoid valve communication hole 232, the pressure gauge communication hole 233 and the air inlet 234 of the four-way body 23 all have internal threads, and are respectively thread-connected to the front end of the air chamber 22, the air inlet end of the solenoid valve 25, the pressure gauge 24 and the high-pressure light gas supply system 1. Thread connection can facilitate the replacement of the air chamber 22, so as to realize the adjustment of the bullet ejection speed, etc.

[0033] The sealing plug 21 has an external thread, and the rear end of the air chamber 22 is provided with an air chamber threaded hole 221. The sealing plug 21 is thread-connected into the air chamber threaded hole 221. By rotating the sealing plug 21, the volume of the sealing plug 21 inserted into the air chamber 22 is adjusted, so as to adjust the capacity of the air chamber 22, and further realize the fine adjustment of the bullet ejection speed, etc.

[0034] The high-pressure light gas supply system 1 includes a high-pressure gas cylinder, a pressure reducing valve, a proportional valve, and a high-pressure pipe. The high-pressure gas cylinder, the pressure reducing valve, the proportional valve, and the high-pressure pipe are sequentially connected by pipe threads. The high-pressure pipe is connected to the air inlet 234 of the four-way body 23 of the gun body unit 2. Light gas (helium, nitrogen, etc.) is output from the high-pressure gas cylinder to the four-way body 23 through the pressure reducing valve, the proportional valve, and the high-pressure pipe.

[0035] The solenoid valve switch system 7 includes a switch button, a DC power supply, and several wires. The wires connect the DC power supply, the switch button, and the solenoid valve 25 of the gun body unit 2 to form a circuit to control the solenoid valve 25.

[0036] As Figure 4 shown, the loading unit 3 includes a locking sleeve 31, a sealing head 32, a conical sealing gasket 33, and a loading support seat 34. The bottom of the loading support seat 34 is fixed on the device base 5 and is located on the front side of the gun body unit 2. The loading support seat 34 has a support seat through hole 341 penetrating through its front and back. The conical sealing gasket 33 has a conical bullet through hole penetrating through its front and back. The conical sealing gasket 33 is fixed on the rear side of the loading support seat 34, and the conical bullet through hole is aligned with the support seat through hole 341. The sealing head 32 has a head air passage penetrating through its front and back. The sealing head 32 is arranged on the rear side of the conical sealing gasket 33, and the head air passage is aligned with the conical bullet through hole of the conical sealing gasket 33. The rear end of the sealing head 32 is fixedly connected and communicated with the air outlet end of the solenoid valve 25 of the gun body unit 2. The locking sleeve 31 is sleeved outside the sealing head 32, and the front end is detachably connected to the loading support seat 34. After connection, the sealing head 32 is pressed tightly against the conical sealing gasket 33.

[0037] Further preferably, a thrust bearing 36 is provided between the locking sleeve 31 and the sealing head 32, and the thrust bearing 36 is sleeved outside the sealing head 32. The locking sleeve 31 has an internal thread, and the upper part of the loading support seat 34 has an external thread. The locking sleeve 31 is sleeved on the sealing head 32, presses against the thrust bearing 36, and then is threadedly connected to the loading support seat 34. After tightening, the sealing head 32 and the conical sealing gasket 33 are pressed tightly against each other to ensure the airtightness of the air passage.

[0038] The specific installation structure of the loading unit 3 is as follows: Pass 4 screws through the 4 gasket counterbores 3301 on the conical sealing gasket 33, and then screw them into the 4 first support seat threaded holes 3401 on the loading support seat 34, then the installation of the conical sealing gasket 33 on the loading support seat 34 can be realized. The rear end of the sealing plug 32 has a plug counterbore 3201 with internal threads communicating with the plug air passage, and the air outlet end of the solenoid valve 25 has external threads. The plug counterbore 3201 at the rear end of the sealing plug 32 is threadedly connected and fixed to the air outlet end of the solenoid valve 25. The support seat through hole 341 on the loading support seat 34 is used to install it on the device base 5 (F aluminum profile). Pass a screw through the support seat installation through hole 3403, then through the gap of the device base 5 (F aluminum profile), and finally screw it into the T-nut, then the fixation of the loading support seat 34 on the device base 5 (F aluminum profile) can be realized.

[0039] As Figure 5 shown, the barrel unit 4 includes a barrel 41, a cover plate 42 and a barrel support beam 43 arranged front and back. The barrel 41 is a capillary tube, so as to achieve high velocity accuracy and high position accuracy of micro projectiles. The barrel support beam 43 is an I-shaped support beam. The barrel support beam 43 is fixed on the device base 5. The upper surface of the barrel support beam 43 has a V-shaped groove 431. The cover plate 42 is located above the barrel support beam 43, and the lower surface of the cover plate 42 has a V-shaped groove. The barrel 41 is stuck between the V-shaped groove 431 of the barrel support beam 43 and the V-shaped groove of the cover plate 42, and the fixation of the barrel 41 is realized by pressing and fixing the cover plate 42 on the barrel support beam 43. The rear end of the barrel 41 is detachably fixed in the support seat through hole 341 of the loading support seat 34 of the loading unit 3 and communicates with the conical bullet through hole of the conical sealing gasket 33. The detachable connection between the barrel 41 and the loading unit 3 can realize the replacement and use of multiple types of barrels.

[0040] The specific installation structure of the barrel unit 4 is as follows: The rear end of the barrel 41 has external threads, and the support seat through hole 341 has internal threads. The rear end of the barrel 41 is screwed into the support seat through hole 341, then the installation of the barrel 41 can be realized. Pass a screw through the cover plate through hole 4201 on the cover plate 42, and then screw it into the support beam threaded hole 4301 on the barrel support beam 43, then the pressing of the barrel 41 can be realized. The support beam through hole 4302 on the barrel support beam 43 is used to install it on the device base 5 (F aluminum profile). Pass a screw through the support beam through hole 4302 on the barrel support beam 43, then through the gap of the device base 5 (F aluminum profile), and finally screw it into the T-nut, then the fixation of the barrel support beam 43 on the device base 5 (F aluminum profile) can be realized.

[0041] Further preferably, the barrel unit 4 further includes a rubber sheet 44, and the rubber sheet 44 is pasted on the surface of the V-shaped groove of the cover plate 42 to protect the barrel 41.

[0042] The front end of the barrel 41 extends out of the barrel support beam 43 and the cover plate 42, and a number of velocity measuring through holes 411 are provided on the side for a laser velocimeter to measure the velocity of the fired projectiles.

[0043] The front end of the barrel support beam 43 has a number of support beam mounting threaded holes 432 for mounting a shooting sight.

[0044] The lower surface of the barrel support beam 43 also has a V-shaped groove 431, so that the device can support two types of barrels 41 only by flipping the barrel support beam 43.

[0045] The loading unit 3 further includes two pull rods 35. The rear end of the pull rod 35 is fixed to the loading support seat 34, and the front end is fixed to the barrel support beam 43 of the barrel unit 4, so as to reduce the load of the barrel 41 during firing, reduce the stress generated in the barrel 41 during firing, and reduce the effect of the recoil force on the barrel 41, as Figure 7 shown. The specific installation structure of the pull rod 35 is: screw the threaded rear end portions of the two pull rods 35 into the two support seat second threaded holes 3402 of the loading support seat 34, and the installation of the two pull rods 35 on the loading support seat 34 can be realized. The front end of the pull rod 35 has a pull rod internal threaded hole 3501. Pass a screw through the support beam rear through hole 4303 at the rear end of the barrel support beam 43 and then screw it into the pull rod internal threaded hole 3501 at the front end of the pull rod 35 to realize the connection between the barrel support beam 43 and the loading support seat 34.

[0046] As Figure 6 shown, the loading mechanism 6 is used for loading micro projectiles. The loading mechanism 6 includes a core rod 61 and a needle 62. The needle 62 is a cylindrical structure with a needle tip at the front end, and the core rod 61 can move within the needle 62.

[0047] During loading, first unscrew the locking sleeve 31, and pull out the locking sleeve 31 and the sealing plug 32 of the gun body unit 2 and the loading unit 3 backward. First place the projectile at the needle tip of the needle 62, then align the needle tip with the conical bullet through hole of the conical sealing gasket 33, and then push the core rod 61 to push the projectile into the barrel 41. Then push back the locking sleeve 31 and the sealing plug 32 of the gun body unit 2 and the loading unit 3, and screw the locking sleeve 31 tightly to complete the loading.

[0048] The computer 8 provides control functions for the entire device. The computer 8 includes a first communication line, a second communication line, and a third communication line. The first communication line is used to send control signals to the proportional valve. The second communication line is used to obtain the chamber pressure value. The third communication line is used to send firing signals.

[0049] The logic controlled by the computer 8 is:

[0050] Step 1: Set the target chamber pressure p g, the computer sends the pressure digital signal to the proportional valve in the high-pressure light gas supply system via the first communication line, and the pressure digital signal p sent to the proportional valve v is 10% greater than the target chamber pressure p g , that is, p v = 1.1p g .

[0051] Step Two: The digital signal of the chamber pressure p p is transmitted to the computer via the second communication line. If then it is considered that p p has reached p v . At this time, the computer sends a closing signal to the proportional valve in the high-pressure light gas supply system, and the proportional valve closes to stop the gas supply.

[0052] Step Three: The chamber pressure p p gradually decreases as the system slowly leaks air. When , the computer sends an opening signal to the solenoid valve of the gun body unit via the third communication line, and the solenoid valve immediately opens. The high-pressure gas pushes the projectile forward to achieve the launch of the projectile.

[0053] The test method of the micro high-precision light gas gun test device includes the following steps:

[0054] S1. Evacuation: The barrel is filled with light gas. The specific method is as follows: First, open the valve of the light high-pressure gas cylinder in the high-pressure light gas supply system, then turn on the pressure reducing valve and set the outlet pressure of the pressure reducing valve to 1.5 times the required maximum air pressure. Set the outlet pressure of the proportional valve to 0.1 MPa. Wait until the pressure gauge shows 0.1 MPa, close the proportional valve, and press the launch button to discharge the air in the air pipe so that the barrel is filled with light gas.

[0055] S2. Loading: The specific method is as follows: Unscrew the locking sleeve, place the projectile at the tip of the needle, and then slowly push the core rod to push the projectile into the barrel. Tighten the locking sleeve to complete the loading.

[0056] S3. Conduct the first test shot: Set the outlet pressure of the proportional valve in the high-pressure light gas supply system to p t1 . Wait until the pressure gauge reads 1.1p t1 and then close the proportional valve of the high-pressure light gas supply system; Wait for the pressure gauge reading p p0 to slowly drop to and then fire the projectile; Measure the flight speed of the projectile as v t1 .

[0057] S4. Record the expected flight speed of the projectile as v ideal .

[0058] Case 1: If vt1 >v ideal , record the corresponding p t1 as the upper limit pressure p max ; at this time, conduct the second test firing, and the test firing pressure is 0.5p t1 , if the flight speed v at this pressure t2 <v ideal , record 0.5p t1 as the lower limit pressure p min , otherwise, it is considered that the lower limit pressure is not found, and multiply the test firing pressure by 0.5 until the lower limit pressure p is found min .

[0059] Case 2: If v t1 <v ideal , record the corresponding p t1 as the lower limit pressure p min ; at this time, conduct the second test firing, and the test firing pressure is 2p t1 , if the flight speed v at this pressure t2 >v ideal , record 2p t1 as the upper limit pressure p max , otherwise, it is considered that the upper limit pressure is not found, and multiply the test firing pressure by 2 until the upper limit pressure p is found max .

[0060] Finally, the upper limit pressure p of the test firing pressure is determined through this step max and the lower limit pressure p min .

[0061] S5. In order to make the velocity of the fired projectile accurate enough, several test firings are required to determine the final chamber pressure p ideal : Between the upper limit pressure p max and the lower limit pressure p min , use the bisection method to calculate the next test firing pressure The flight speed of the projectile at this pressure is v ti ; if v ti >v ideal , then let p max =p ti ; otherwise let p min =p ti ; this step determines the upper limit pressure p max and the lower limit pressure p min .

[0062] S6. Repeat S5 until then let

[0063] S7. Aim the gun barrel at the target, load the ammunition, and use a computer to apply pressure and fire automatically with p ideal as the target chamber pressure p g ​

Claims

1. A micro high-precision light gas gun test device, characterized in that: It includes a high-pressure light gas supply system, a gun body unit, a loading unit, a barrel unit and a device base; The gun body unit includes a sealing plug, an air chamber, a four-way body, a pressure gauge, an electromagnetic valve, a gun body base and a gun body bottom plate; The four-way body is fixed on the gun body base, and the four-way body has a communicating air chamber connecting hole, an electromagnetic valve connecting hole, a pressure gauge connecting hole and an air inlet; The front end of the air chamber is communicated with the air chamber connecting hole of the four-way body; the sealing plug is plugged into the rear end of the air chamber, and the sealing plug can move relative to the air chamber to adjust the volume of the sealing plug inserted into the air chamber; The pressure gauge is connected to the pressure gauge connecting hole of the four-way body; The high-pressure light gas supply system is connected to the air inlet of the four-way body to input gas into the four-way body; The electromagnetic valve is fixed on the gun body base; the air inlet end of the electromagnetic valve is communicated with the electromagnetic valve connecting hole of the four-way body; The gun body base is arranged on the gun body bottom plate and is slidably connected to the gun body bottom plate, and can slide back and forth relative to the gun body bottom plate; The gun body bottom plate is fixed on the device base; The loading unit includes a locking sleeve, a sealing head, a conical sealing gasket and a loading support seat; The bottom of the loading support seat is fixed on the device base and is located on the front side of the gun body unit; the loading support seat has a support seat through hole penetrating through its front and rear; The conical sealing gasket has a conical bullet through hole penetrating through its front and rear; the conical sealing gasket is fixed on the rear side of the loading support seat, and the conical bullet through hole is aligned with the support seat through hole; The sealing head has a head air passage penetrating through its front and rear; the sealing head is arranged on the rear side of the conical sealing gasket, and the head air passage is aligned with the conical bullet through hole of the conical sealing gasket; the rear end of the sealing head is fixedly connected and communicated with the air outlet end of the electromagnetic valve of the gun body unit; The locking sleeve is sleeved outside the sealing head, and the front end is detachably connected to the loading support seat. After connection, the sealing head is pressed against the conical sealing gasket; The barrel unit includes a barrel, a cover plate and a barrel support beam arranged front and rear; The barrel is a capillary tube; The barrel support beam is fixed on the device base; the upper surface of the barrel support beam has a V-shaped groove; the cover plate is located above the barrel support beam, and the lower surface of the cover plate has a V-shaped groove; the barrel is clamped between the V-shaped groove of the barrel support beam and the V-shaped groove of the cover plate, and the barrel is fixed by fixing the cover plate on the barrel support beam; The rear end of the barrel is detachably fixed in the support seat through hole of the loading support seat of the loading unit and is communicated with the conical bullet through hole of the conical sealing gasket; The loading unit further includes a plurality of pull rods; the rear ends of the pull rods are fixed to the loading support seat, and the front ends are fixed to the barrel support beam of the barrel unit.

2. The micro high-precision light gas gun test device according to claim 1, characterized in that: It further includes a loading mechanism; The loading mechanism includes a core rod and a needle; The needle is a cylindrical structure with a needle tip at the front end, and the core rod can move inside the needle; First, place the projectile at the needle tip of the needle, then align the needle tip with the conical bullet through hole of the conical sealing gasket, and then push the core rod to push the projectile into the barrel.

3. The micro high-precision light gas gun test device according to claim 1, characterized in that: Among them, In the gun body unit, the air chamber communication hole and the solenoid valve communication hole of the four-way body are arranged on a straight line in the front-back direction. The pressure gauge communication hole and the air inlet are perpendicular to each other and are staggered in the front-back direction.

4. The micro high-precision light gas gun test device according to claim 1, wherein: Among them, In the gun body unit, the gun body base includes a gun body stepped base and a gun body flat base. The four-way body and the solenoid valve are both fixed on the gun body stepped base, and the gun body stepped base is fixed on the gun body flat base; The gun body unit further includes a plurality of linear sliders and a plurality of guide rails; a plurality of linear sliders are fixed on the lower surface of the gun body flat base, a plurality of guide rails are fixed on the upper surface of the gun body bottom plate, the plurality of linear sliders and the plurality of guide rails correspond to each other and match one by one, the linear sliders are slidably connected to the corresponding guide rails, and the gun body flat base is slidably connected to the gun body bottom plate through the linear sliders and the guide rails; The air chamber communication hole, the solenoid valve communication hole, the pressure gauge communication hole and the air inlet of the four-way body all have internal threads and are respectively threadedly connected to the front end of the air chamber, the air inlet end of the solenoid valve, the pressure gauge and the high-pressure light gas supply system; The sealing plug has an external thread, and an air chamber threaded hole is provided at the rear end of the air chamber. The sealing plug is threadedly connected to the air chamber threaded hole, and the volume of the sealing plug inserted into the air chamber is adjusted by rotating the sealing plug.

5. The micro high-precision light gas gun test device according to claim 1, wherein: Among them, In the ammunition loading unit, a thrust bearing is provided between the locking sleeve and the sealing head, and the thrust bearing is sleeved outside the sealing head; The locking sleeve has an internal thread, the upper part of the ammunition loading support seat has an external thread, the locking sleeve is sleeved on the sealing head, abuts against the thrust bearing, and is then threadedly connected to the ammunition loading support seat. After tightening, the sealing head and the conical sealing gasket are tightened against each other.

6. The micro high-precision light gas gun test device according to claim 1, wherein: Among them, The barrel unit further includes a rubber sheet, and the rubber sheet is pasted on the surface of the V-shaped groove of the cover plate; The front end of the barrel extends out of the barrel support beam and the cover plate, and a plurality of velocity measurement through holes are provided on the side; The front end of the barrel support beam has a plurality of support beam mounting threaded holes for mounting a shooting sight; The lower surface of the barrel support beam also has a V-shaped groove.

7. The micro high-precision light gas gun test device according to claim 1, wherein: Among them, The high-pressure light gas supply system includes a high-pressure gas cylinder, a pressure reducing valve, a proportional valve and a high-pressure pipe; The high-pressure gas cylinder, the pressure reducing valve, the proportional valve and the high-pressure pipe are sequentially connected by pipe threads, the high-pressure pipe is connected to the air inlet of the four-way body of the gun body unit, and the light gas is output from the high-pressure gas cylinder to the four-way body through the pressure reducing valve, the proportional valve and the high-pressure pipe.

8. The micro high-precision light gas gun test device according to claim 1, wherein: It further includes a solenoid valve switch system; The solenoid valve switch system includes a switch button, a DC power supply and a plurality of wires; The wires connect the DC power supply, the switch button and the solenoid valve of the gun body unit to form a circuit to control the solenoid valve.

9. The micro high-precision light gas gun test device according to claim 1, wherein: It further includes a computer; The computer includes a first communication line, a second communication line and a third communication line; The first communication line is used to send a control signal to the proportional valve; the second communication line is used to obtain the chamber pressure value; the third communication line is used to send a firing signal; The computer control logic is as follows: Step 1, set the target chamber pressure p g , and the computer sends the pressure digital signal to the high-pressure light gas supply system via the first communication line. The sent pressure digital signal p v is 10% higher than the target chamber pressure p g ; Step 2, the digital signal of the chamber pressure p p is transmitted to the computer via the second communication line. If , then it is considered that p p has reached p v . At this time, the computer sends a closing signal to the high-pressure light gas supply system to stop the gas supply; Step 3, the chamber pressure p p gradually decreases as the system slowly leaks air. When , the computer sends an opening signal to the solenoid valve of the gun body unit via the third communication line, and the solenoid valve immediately opens. The high-pressure gas pushes the projectile forward to achieve the launch of the projectile.

10. The test method of the micro high-precision light gas gun test device according to any one of claims 1-9, characterized in that: It includes the following steps: S1, evacuation, the barrel is filled with light gas; S2, loading; S3. Conduct the first test firing: Set the outlet pressure of the high-pressure light gas supply system to p t1 , and wait for the pressure gauge reading p p0 to reach 1.1p t1 . After that, close the high-pressure light gas supply system; Wait for the pressure gauge reading p p0 Slowly decrease to and then fire the projectile The flying speed of the projectile measured by the speed measurement system is v t1 ; S4. Denote the expected projectile flight speed as v ideal ; If v t1 > v ideal , record the corresponding p t1 as the upper limit pressure p max ; at this time, conduct the second test shot with the test shot pressure of 0.5p t1 . If the flight speed v t2 < v ideal at this pressure, record 0.5p t1 as the lower limit pressure p min , otherwise, it is considered that the lower limit pressure is not found, and multiply the test shot pressure by 0.5 further until the lower limit pressure p min is found; If v t1 < v ideal , record the corresponding p t1 as the lower limit pressure p min ; At this time, conduct the second test shot, and the test shot pressure is 2p t1 , if the flight speed v t2 > v ideal , record 2p t1 as the upper limit pressure p max , otherwise it is considered that the upper limit pressure is not found, multiply the test shot pressure by 2 further until the upper limit pressure p max is found; Finally, the upper limit pressure p of the firing pressure is determined through this step max and the lower limit pressure p min ; S5. To ensure that the velocity of the fired projectile is accurate enough, several test firings are required to determine the final chamber pressure p ideal : Between the upper limit pressure p max and the lower limit pressure p min , the bisection method is used to calculate the next test firing pressure At this pressure, the flight velocity of the projectile is v ti ; If v ti >v ideal , then let p max = p ti ; Otherwise let p min = p ti ; This step determines the upper pressure limit p of the new firing pressure max and the lower pressure limit p min ; S6. Repeat S5 until Then let S7. Aim the gun barrel at the target, load the ammunition, and pressurize and fire with p ideal as the target chamber pressure.

Images