RU2238503C1 - Device for cutting-off of bottom plate of subcaliber striker - Google Patents

Abstract

FIELD: test equipment, mainly used in study of high-speed interaction of solid bodies.

SUBSTANCE: the device has a ring installed in the flight path, its inside diameter is less than the diameter of the bottom plate, but exceeds the striker diameter, and a shutoff device with a hole for passing of the striker and being distant from the ring in the direction of striker flight. Placed in the hole of the shutoff device is a changeable bush, whose inlet and outlet parts of the port are made in the form of bells expanding towards the end faces of the bush, a ring explosive charge is positioned on the inner tapered surface of the inlet bell. The charge may have a variable thickness in contour.

EFFECT: enhanced efficiency of cutting-off of the bottom plate, including cutting-off in the conditions of rarefied atmosphere and vacuum.

2 cl, 5 dwg

Description

The invention relates to a testing technique. The primary area of use is the study of high-speed interaction of solids, for example, modeling the impact of "space debris" on orbiting space objects.

For throwing from a barrel ballistic installation, a sub-caliber projectile is placed in a pan that guides the projectile along the barrel and protects it from the effects of throwing gas. After departure from the barrel, the pallet should be withdrawn from the flight path of the striker or cut off, since its impact on the test object is unacceptable.

The sectional type pallet is known (see the book under the editorship of NA Zlatin and GI Mishin. Ballistic installations and their application in experimental studies. - M .: Nauka, 1974, p. 112), sections of which after exit from the barrel of the ballistic installation under the action of the radial component of the aerodynamic drag force is removed from the flight path of the striker and stopped, for example, with a metal plate-cutter with an opening for the passage of the striker.

The disadvantages of this type of pallet include its low strength and the inability to remove the striker from the flight path in a rarefied atmosphere and vacuum.

It is known "Device for braking the pallet", the patent of Germany No. PS 3424597, IPC 4 F 41 F 3/04, publ. 01/09/86. A device for braking a pallet made with the possibility of installing a sub-caliber drummer moving along the barrel of a ballistic installation with great acceleration contains a brake sleeve mounted in the barrel in the region of the muzzle. The sleeve together with the barrel forms an intermediate chamber, into which, when the pallet is moved, its front sharp edge enters and braking is performed.

The disadvantage of this device should be attributed to its inoperability at hypersonic speeds of projectile throwing, since it is not possible to brake the pallet having a speed equal to the speed of the projectile without destruction.

In addition, the destruction of the pallet (and possibly the sleeve) will inevitably lead to damage to the bore of the ballistic installation and the formation of a field of fragments moving after the hammer.

It is known "Device for throwing a sub-caliber impactor", RF patent No. 2176369, IPC 7 F 41 A 21/46, publ. 11/27/2001, Bull. No. 3, selected as a prototype. The device comprises a barrel with a muzzle fixed on it in the form of a sleeve and a pallet of polymer material made with the possibility of installing a sub-caliber element in it. A cut-off ring is installed in the output part of the muzzle, the inner diameter of which is smaller than the diameter of the pallet, but larger than the diameter of the hammer. Behind the cut-off ring, a cutter is located at a certain distance in the direction of flight of the striker.

The disadvantage of the prototype should include the possibility of passing fragments of the pallet, destroyed by the cut-off ring, to the test object and its re-loading with fragments after the drummer. The cutter, made in the form of a plate with a hole, will stop only the peripheral part of the field of fragments of the pallet.

The technical problem to be solved is the creation of a device that provides for cutting off the pallet of a sub-caliber projectile and excluding its impact on the test object.

The expected technical result is to increase the efficiency of cutting the pallet, including cutting in a rarefied atmosphere and vacuum.

The technical result is achieved through the use of a device for cutting off the pod of a caliber projectile, containing a ring installed on the path of the projectile, the inner diameter of which is smaller than the diameter of the pallet, but larger than the diameter of the projectile, and a cutter with an opening for the projectile spaced from the ring in the direction of flight of the projectile. A replaceable sleeve is placed in the bore of the cutter, the input and output parts of the channel of which are made in the form of flares extending to the sides of the sleeve end, and an explosive ring charge is placed on the inner conical surface of the input socket. The latter can be made of variable thickness along the contour.

A comparative analysis of the proposed solution and the prototype shows that the inventive device for cutting off the pallet of the caliber drummer differs from the known following structural features:

- a sleeve is placed in the cutter hole;

- the sleeve is removable;

- the input part of the bushing channel is made in the form of a bell extending towards the bushing;

- the output part of the bushing channel is made in the form of a bell extending towards the end face of the sleeve;

- an explosive charge is placed on the inner conical surface of the inlet socket;

- the explosive charge is made circular;

- the explosive charge is made of variable thickness along the contour.

The placement in the hole of the cutter sleeve follows from the conditions of its fixing on the cutter and the possibility of passage through the cutter striker.

The implementation of the replaceable sleeve allows you to replace the latter after the experiment, since it is damaged when the explosive charge is detonated.

The implementation of the input part of the bushing channel in the form of a flare expanding towards the end face of the bushing makes it possible to place an explosive charge on its surface to form an explosion product converging to the center of the cloud, blocking the bushing channel for fragments of the pallet and deflecting them in the radial-axial direction relative to the projectile flight path.

The implementation of the output part of the bushing channel in the form of a flare extending towards the end of the bushing sleeve reduces the impact on the projectile passing through the channel of the explosion products flowing into the channel.

The placement of an explosive charge on the inner conical surface of the inlet socket ensures that, when it is detonated, a cloud of explosion products forms, which locks the sleeve channel for fragments of the pallet.

Performing a ring explosive charge allows you to form a cloud of explosion products converging to the center of the channel.

The execution of the explosive charge of variable thickness along the contour provides the formation of an asymmetric cloud of explosion products.

An example implementation of the device for cutting off the pallet of the caliber projectile is illustrated by drawings.

Figure 1 shows a device for cutting off the pallet of a caliber projectile at the time of approach of the pallet to the ring; figure 2 is the same, the device at the time of flight of the projectile through the channel of the cutter sleeve and the initiation of the initiation of the ring charge of the explosive by the leading fragment of the pallet; figure 3 - the same device at the time of cutting off the fragments of the pallet by the detonation products of the annular explosive charge; figure 4 - ring charge of explosives of variable thickness; figure 5 - the device at the time of cutting off fragments of the pallet with the use of charge by changing the thickness along the contour.

A device for cutting off the pallet 1 from a polymeric material, configured to install a sub-caliber drummer 2, comprises a muzzle 4 with a ring 5 fixed to the muzzle of the barrel 3 of the ballistic installation, the inner diameter of which is smaller than the diameter of the pallet 1, but larger than the diameter of the striker 2, and spaced from the ring 5 in the direction of flight of the striker, the cutter 6 with the hole 7 for the passage of the striker 2. In the hole 7 of the cutter 6 is placed a replaceable sleeve 8 with a channel 9, the input and output parts of which are made in the form of expanding hsya ends to the sides of the sleeve 8 of sockets 10 and 11, wherein the inner conical surface of the inlet bell 10 placed annular explosive charge 12. The annular charge 12 can have a variable thickness along the contour.

A device for cutting off the pallet of a sub-caliber projectile works as follows. A pallet 1 made of a polymeric material with a striker 2 located on its front end accelerates in the bore of the ballistic installation 3 and, after exiting it, falls into the muzzle 4. Upon impact with the ring 5 of the pallet 1, since its diameter is larger than the inner diameter of the ring, braking occurs and the destruction of the pan 1 with the formation of expanding radially relative to the flight path of the striker 2 of the field of fragments 13. The striker 2, having a diameter smaller than the inner diameter of the ring 5, freely spills flushes through the hole in the ring. Since during the collision of the pallet 1 with the ring 5 there is a braking of the pallet, the fragments of the latter lag behind the striker and fly up to the sleeve 8 of the cutter 6 after the striker enters the channel 9. The leading fragment 14 of the pallet 1, affecting the ring charge of the explosive 12, initiates it. The inlet 10 forms a center-converging cloud of explosion products 15, which locks the channel 9 in the sleeve 8 and, deflecting the fragments 13 in the radial-axial direction, prevents them from passing to the test object. Explosion products from the rear zone 16 of the cloud of explosion products 15, flowing into the sleeve and expanding in the outlet bell 11, lose speed and reduce the impact on the projectile passing through the channel 2. This eliminates the perturbation of the projectile flight path.

The use of an annular explosive charge 12 by varying the thickness along the contour allows the formation of an asymmetric cloud of explosion products, which, when cutting off fragments of the pallet, leads them away from the axis of fire.

The proposed device for cutting off the pallet of the sub-caliber drummer has that significant positive quality in comparison with the prototype, which allows to increase the efficiency of cutting off the leading pallet, including in a rarefied atmosphere and vacuum.

Claims (2)

1. A device for cutting off a pallet of a sub-caliber striker, comprising a ring installed on the path of the striker, the inner diameter of which is smaller than the diameter of the pallet, but larger than the diameter of the striker, and a cutter with a hole for the striker passage, spaced apart from the ring in the direction of flight of the striker, characterized in that in the hole a cutter is placed a replaceable sleeve, the input and output parts of the channel of which are made in the form of flares extending to the sides of the ends of the sleeve, and on the inner conical surface of the input the ring is placed annular explosive charge. 2. The device according to claim 1, characterized in that the annular explosive charge is made of variable thickness along the contour.

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