CN113176156B - Light gas gun test device capable of switching rotatable gun barrel in situ - Google Patents

Abstract

The invention discloses a light gas gun test device for in-situ switching of rotatable gun barrels, which comprises a multi-gun barrel annular support, a gun barrel cluster, a loading port end socket, an outlet speed measuring end socket and a base, wherein the multi-gun barrel annular support comprises a square support and a chuck, the square support is fixed on the base, and the chuck is arranged in the square support; the gun barrel cluster comprises a plurality of cylindrical gun barrels, and the cylindrical gun barrels are respectively and independently arranged in the chuck and can independently rotate relative to the chuck; the loading port end socket is connected with an energy storage tank and arranged at the inlet of the cylindrical gun barrel; the outlet speed measuring seal head is arranged at the outlet of the cylindrical gun barrel, and the outlet speed measuring seal head is connected with a laser speed measuring system. The invention can directly load non-circular projectiles, can effectively improve the influence of the projectile holder on the impact speed and direction of the projectiles, and can effectively solve the requirements of various simulated foreign objects and the requirement of adjustable flying postures of the foreign objects in a foreign object impact damage test by switching functions of a plurality of gun barrels.

Description

A light gas cannon test device with in-situ switchable rotatable barrel

technical field

The invention relates to a light gas cannon test device for switching a rotatable barrel in situ, belonging to the field of material and structure foreign object damage testing.

Background technique

During the take-off, landing or near-ground flight of an airplane/helicopter, hard objects such as gravel, stones or metal objects on the runway or the ground are often sucked into the flow path of the aero-engine along with strong airflow, and then combined with the high-speed rotating fan/compressed air The collision of engine blades causes hard object impact damage (or called foreign object damage FOD), which can cause high-cycle fatigue damage to engine blades in the slightest, and directly break the blades in severe cases.

The severity of foreign object damage often depends on the shape and size of the foreign objects inhaled by the engine, but the complex external environment (especially for helicopter engines) leads to a large randomness in the shape and size of foreign objects ingested by the aeroengine, and after the foreign object damage event occurs , engineers can only guess the material, shape and size of the inhaled hard object based on the damage appearance and severity. In order to fully understand the influence of foreign object damage that may occur in the field on the structural durability of blades such as high cycle fatigue, engineers need to artificially create hard object impact damage. Although the test of real engine inhalation of foreign objects can absolutely reproduce the foreign object damage, the test process is not only uncontrollable but also extremely costly. Therefore, it is particularly important to simulate the real damage in the field under laboratory conditions for the durability design and maintenance evaluation of the blade structure after foreign object damage.

For this reason, people have invented a light gas cannon test device (such as the patent "CN201710896598.0 A low-velocity light gas cannon impact test device") to simulate foreign object damage under laboratory conditions. In order to simulate the diversity of foreign object damage in the field, the simulated impact test needs to use different materials, different sizes and different shapes of simulated foreign objects to impact the test piece with different flight attitudes, which puts forward the compatibility and diversity of light gas guns. requested. At the same time, in order to ensure the stability and repeatability of the impact test, the disturbance caused by the separation of the carrier and the projectile to the flight attitude of the projectile has gradually become an unacceptable situation for engineers. For a long time, the method of using a single circular bore section gun barrel plus a bullet support has been unable to fully accommodate a variety of foreign objects, nor can it effectively prevent the influence of the bullet support on the flight attitude of the projectile when it breaks away. If more The impact damage simulation test of different foreign objects within the shape/size range requires the construction of multiple sets of light gas gun test devices or the replacement and modification of the barrel, which not only requires a large amount of test space, but also requires additional costs.

Contents of the invention

The object of the present invention is to provide a light gas cannon test device with in-situ switchable rotatable barrel to solve the impact of the bullet rest on the flight attitude of the projectile in the foreign object damage simulation test and the impact test on the diversity of the barrel and projectile attitude. The problem.

To achieve the above object, the technical solution adopted in the present invention is:

A light gas cannon test device for switching rotatable barrels in situ, including multi-barrel annular supports, barrel clusters, loading port caps, exit velocity measuring caps and a base, wherein:

The multi-barrel annular support includes a square bracket and a chuck, the square bracket is fixed on the base, and the chuck is arranged in the square bracket;

The barrel cluster includes a plurality of cylindrical barrels, and the plurality of cylindrical barrels are independently arranged in the chuck and can rotate independently relative to the chuck;

The charging port head is connected with an energy storage tank, which is arranged at the entrance of the cylindrical gun barrel;

The outlet speed-measuring head is arranged at the exit of the cylindrical gun barrel, and the outlet speed-measuring head is connected with a laser speed-measuring system.

The chuck is provided with a plurality of holes for the cylindrical gun barrel to pass through, and three clamping blocks and springs are evenly arranged on the inner wall of each hole, and one end of the spring contacts the clamping block, and the other end contacts the inner wall of the hole.

The chuck is circular, and its circumference is provided with several positioning grooves, and a positioning hole is provided on the square support, and a positioning groove of the chuck corresponds to the positioning hole of the square support, and is positioned by inserting a pin.

The square bracket is composed of two semicircular components, and the two sides of the semicircular components are fixedly connected by lifting screws.

The loading port head is a cylindrical internal threaded head, and a cylindrical internal and external thread gasket is arranged between it and the cylindrical gun barrel.

The outlet speed-measuring head is cylindrical and has internal threads, and its side wall is provided with two square penetrating gaps, and a cylindrical internal and external thread gasket is arranged between the outlet speed-measuring head and the cylindrical gun barrel.

The multiple cylindrical gun barrels have different bore cross-sectional shapes, different inner diameters, and different outer diameters;

The cross-sectional shapes of the bores of the plurality of cylindrical gun barrels include triangle, ellipse, and square.

Beneficial effects: the invention effectively solves the problem of the influence of the bullet rest on the flight attitude of the projectile in the foreign object damage simulation test and the demand for the diversity of the gun barrel and the diversity of the projectile attitude in the impact test. The projectile is directly loaded for impact, avoiding the impact of the projectile support on the flight attitude of the projectile, and the mode of replacing the barrel with rotation has the advantages of saving space, reducing component assembly and simple operation; the independent rotating device for the support of the barrel can better facilitate the test Personnel adjust the impact form and projectile posture to prevent the non-adjustability of welding; the use of positioning pins can save processing costs to the greatest extent, and it is convenient to use and accurate in positioning.

Description of drawings

Fig. 1 is the structural representation of the light gas cannon test device of the in-situ switching rotatable gun barrel of the present invention;

Fig. 2 is a schematic structural view of the loading port head;

Fig. 3 is the structural representation of chuck;

Fig. 4 is the front view of the light gas cannon test device of the in-situ switching rotatable gun barrel of the present invention;

Fig. 5 is a schematic diagram of direct loading of projectiles;

The symbols in the figure are explained as follows:

1-Exit speed measuring head, 2-Circular chuck, 3-Base, 4-Pin, 5-Lifting bolt, 6-Square support, 7-Barrel cluster, 8-Loading port head, 9-Energy storage Tank, 10-cylindrical spacer, 11-block, 12-spring, 13-pin positioning slot, 14-triangular cross-section gun barrel, 15-elliptical cross-section gun barrel, 16-square cross-section gun barrel.

detailed description

The present invention will be further explained below in conjunction with the accompanying drawings.

As shown in Fig. 1, a kind of in-situ switchable light gas cannon test device of the rotatable barrel of the present invention comprises multi-barrel annular supports, barrel clusters, ammunition opening head, outlet velocity measuring head and base, wherein :

The multi-barrel annular support includes a square bracket 6 and a chuck 2, the square bracket 6 is fixed on the base 3, the chuck 2 is arranged in the square bracket 6, and lubricating oil is used between the parts for lubrication;

The gun barrel cluster 7 includes a plurality of cylindrical gun barrels, and the plurality of cylindrical gun barrels are independently arranged in the chuck 2 and can rotate independently relative to the chuck 2. , different inner diameters, different outer diameters;

The loading port head 8 is connected with an energy storage tank 9, and is arranged at the entrance of the cylindrical gun barrel;

The exit speed measuring head 1 is arranged at the exit of the cylindrical gun barrel, and the exit speed measuring head 1 is connected with a laser speed measuring system.

As shown in Figure 2, the loading port head 8 is a cylindrical internal threaded head, and a cylindrical internal and external thread gasket 10 is arranged between it and the cylindrical barrel, and the loading port head 8 can be compatible with different internal and external diameters. barrel.

The outlet speed-measuring head 1 is cylindrical and has internal threads, and its side wall is provided with two square penetrating gaps. A cylindrical internal and external thread gasket 10 is arranged between the outlet speed-measuring head 1 and the cylindrical gun barrel. The velocity measuring head 1 can be compatible with gun barrels of different inner and outer diameters.

As shown in Figure 3, the chuck 2 is provided with a plurality of holes for the cylindrical gun barrel to pass through, and three blocks 11 and springs 12 are uniformly arranged on the inner wall of each hole, and one end of the spring 12 contacts the blocks 11, The other end contacts the inner wall of the hole. The chuck 2 can be positioned at three points by the block 11 and the spring 12, can be compatible with gun barrels of different inner and outer diameters, and can make each gun barrel rotate independently.

Chuck 2 is circular, and its circumference is provided with some positioning grooves 13, and square support 6 is provided with a positioning hole, and a positioning groove 13 of chuck 2 corresponds to the positioning hole of square support 6, and by inserting pin 4 position.

The square support 6 is made up of two semicircular parts, and the two sides of the semicircular parts are fixedly connected by lifting screws 5 .

As shown in FIG. 5 , the cross-sectional shapes of the bores of multiple cylindrical gun barrels include triangles, ellipses, squares, and the like.

The present invention will be further described below in conjunction with embodiment.

Example

This embodiment is the implementation of the foreign object damage simulation test and the situation of switching the gun barrel.

Before the test starts, the chuck 2 is installed on the square support 6, and then all the gun barrels required for the test are installed on the circular chuck 2, and are axially fixed by the blocks 11 distributed in an equilateral triangle; tighten and lift The bolt 5 fixes the circular chuck 2 .

When in use, take the overhead pin 4, unscrew the lifting bolt 5, turn the circular chuck 2, rotate the required gun barrel to the bottom, and fix it in the circular chuck pin positioning groove 13 by the pin 4; The head 8 and the gasket 10 are connected to the energy storage tank 9; use the outlet speed measurement head 1 to connect the laser speed measurement system, and check whether the laser speed measurement system can work reliably; put down the protective cover, when the air pressure of the energy storage tank reaches the set value Press the solenoid valve switch at the position to perform air-fire operation, remove the air in the energy storage tank and the foreign matter in the barrel; open the protective cover, and fix the test piece with a clamp according to the requirements of the experimental plan on the impact angle and position; put down the protective cover Cover to ensure that the protective cover completely wraps the test piece to prevent the projectile from flying out and injuring the test personnel; put the projectile into the barrel loading port 8, and tighten the compatible head of the loading port; when the air pressure of the energy storage tank reaches the set value , turn off the switch of the gas storage tank; the tester avoids, turns on the solenoid valve switch at a distance, and implements the test.

When switching the barrel in the middle of the test, unscrew the loading port head 8, unscrew the outlet speed measuring head 1, remove the pin 4, loosen the lifting screw 5, make the used barrel to the bottom, and then use the pin 4 Tighten the lifting screw 5 after the circular chuck pin positioning groove 13 is positioned, screw on the compatible head 8 of the loading port, and screw on the outlet speed measuring head 1 to complete the gun barrel switch.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (4)

1. A light gas cannon test device for switching rotatable gun barrels in situ, characterized in that: comprise multiple gun barrel annular supports, gun barrel clusters, loading port seals, outlet velocity measuring seals and bases, wherein: The multi-barrel annular support includes a square bracket (6) and a chuck (2), the square bracket (6) is fixed on the base (3), and the chuck (2) is arranged in the square bracket (6); The barrel cluster (7) includes a plurality of cylindrical barrels, and the plurality of cylindrical barrels are independently arranged in the chuck (2), and can rotate independently relative to the chuck (2), wherein the The multiple cylindrical gun barrels have different bore cross-sectional shapes, different inner diameters, and different outer diameters; The chuck (2) is provided with a plurality of holes for the cylindrical gun barrel to pass through, and three blocks (11) and springs (12) are uniformly arranged on the inner wall of each hole, and one end of the spring (12) contacts Block (11), the other end contacts the inner wall of the hole, wherein the chuck (2) is used for three-point positioning through the block (11) and the spring (12), compatible with barrels of different inner and outer diameters , and make each gun barrel have an independent rotation function; The loading port head (8) is connected with an energy storage tank (9), and is arranged at the entrance of the cylindrical gun barrel; The loading port head (8) is a cylindrical internal threaded head, and a cylindrical internal and external thread gasket (10) is arranged between it and the cylindrical gun barrel, wherein the loading port head (8) Compatible with barrels of different inner and outer diameters; The outlet speed measuring head (1) is arranged at the exit of the cylindrical gun barrel, and the outlet speed measuring head (1) is connected with a laser speed measuring system; The outlet speed-measuring head (1) is cylindrical and has an internal thread, and its side wall is provided with two square penetrating gaps, and a cylindrical inner and outer hole is arranged between the outlet speed-measuring head (1) and the cylindrical gun barrel. threaded gasket (10); The light gas gun test device is used to generate various projectile attitudes. 2. The light gas cannon test device for switching the rotatable gun barrel in situ according to claim 1, characterized in that: the chuck (2) is circular, and several positioning grooves (13) are arranged in its circumferential direction, A positioning hole is provided on the square support (6), and a positioning groove (13) of the chuck (2) corresponds to the positioning hole of the square support (6), and is positioned by inserting the pin (4). 3. The light gas cannon test device for switching the rotatable gun barrel in situ according to claim 1, characterized in that: the square support (6) is made up of two semicircular parts, two semicircular parts Both sides of the component are fixedly connected by lifting screws (5). 4. The light gas cannon test device for in-situ switching and rotatable barrels according to claim 3, characterized in that: the cross-sectional shapes of the bores of the plurality of cylindrical barrels include triangles, ellipses, and squares.

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