Protective cover ejection device

Abstract

The present invention discloses a protective cover ejection device, wherein an ignition and detonation mechanism, a connection and separation mechanism and a cable cutting mechanism are installed in the protective cover, the ignition and detonation mechanism and the cable cutting mechanism are fixedly connected in the radial direction, and the cable cutting mechanism is located below the ignition and detonation mechanism, and the ignition and detonation mechanism and the connection and separation mechanism are fixedly connected in the axial direction. The advantages of the present invention are: the present invention is applicable to the connection and separation device of the protective cover of cruise missiles, space vehicles, etc., and the protective cover can be reliably connected when connected, and the protective cover can be quickly separated by the pyro-actuated device when separated, and the self-powered power cable can be cut off at the same time, so as to complete the ejection separation of the protective cover from the missile body or the vehicle body.

Description

Technical Field

[0001] The invention relates to an ejection device, in particular to a protective cover ejection device, and belongs to the technical field of aerospace pyrotechnic power devices. Background Art

[0002] The existing protective cover ejection device is mainly composed of 4 independent structures: igniter, pyrotechnic ejector, pyrotechnic cutter, and explosive transmission device. The operation of the pyrotechnic ejector and pyrotechnic cutter depends on the igniter to ignite the explosive transmission device, and then the pyrotechnic ejector and pyrotechnic cutter are detonated to realize the ejection separation of the protective cover and the cutting of the self-contained cable. It requires multiple devices to work together, occupies a large space, uses a large amount of explosives, and requires the use of explosive transmission devices, which is costly. If the explosive transmission device fails, it will affect the realization of subsequent ejection and cutting functions. There are weak links in reliability. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention proposes a protective cover ejection device, which is suitable for a connection and separation device of a protective cover of a cruise missile or a space launcher. When connected, the protective cover can be reliably connected. When separated, the protective cover can be quickly separated by a pyrotechnic actuator and the power supply cable can be cut off at the same time, thereby completing the ejection and separation of the protective cover.

[0004] In this protective cover ejection device, the ignition and detonation mechanism, the connection and separation mechanism and the cable cutting mechanism are integrated and installed on the protective cover through a threaded interface. The ignition and detonation mechanism and the cable cutting mechanism are fixedly connected in the radial direction, and the cable cutting mechanism is located below the ignition and detonation mechanism. The ignition and detonation mechanism and the connection and separation mechanism are fixedly connected in the axial direction.

[0005] One end of the unlocking piston of the connection and separation mechanism is inserted into the main structure of the ignition and detonation mechanism, and the other end passes through the protective cover to axially lock the unlocking piston, the escape cap and the connecting tube by a locking screw. A rolling tightening element is provided between the unlocking piston and the connecting tube, and an unlocking groove is provided at one end of the unlocking piston close to the ignition and detonation mechanism. The tightening element is made of steel balls and the unlocking groove is a groove.

[0006] The main structure of the ignition and detonation mechanism is mounted on the outside of the unlocking piston. The igniter is connected to the power supply cable and installed in the upper mounting hole of the main structure. A medicine box is provided inside the main structure and is located below the igniter. A cable cutting mechanism is installed at the lower end of the main structure.

[0007] The cutting cylinder of the cable cutting mechanism is fixedly connected to the ignition and detonation mechanism, a cutting knife is arranged in the cutting cylinder, and a cutting board is installed below the cutting cylinder.

[0008] In order to prevent the unlocking piston from axially moving due to external impact or vibration, causing the pressing element to roll and cause mis-locking, a piston shear pin is provided between the main structure and the unlocking piston.

[0009] A buffer pad is provided between the connecting tube and the escape cap.

[0010] A mounting hole for mounting a plugging cover is provided on a side of the main structure opposite to the unlocking piston, and a sealing ring is provided between the plugging cover and the main structure.

[0011] The cutting cylinder is installed on the main structure through a large mounting cap. The cutting cylinder is provided with a C-shaped opening groove. The cutter in the cutting cylinder is positioned by a shear pin, which is installed in the cutting cylinder. The anvil is installed under the cutting cylinder and fastened by a small mounting cap.

[0012] The cutter is provided with two annular sealing grooves, and two circles of sealing rubber rings are installed in the sealing grooves.

[0013] The unlocking piston is provided with two annular sealing grooves, and two circles of sealing rubber rings are installed in the sealing grooves.

[0014] The advantages of the present invention are that the present invention is suitable for connecting and separating devices of protective covers of cruise missiles, space vehicles, etc., and reliable connection of the protective cover is achieved during connection. During separation, the protective cover is quickly separated by a pyrotechnic actuator and the power supply cable is cut off at the same time, thereby completing the ejection separation of the protective cover from the missile body or the vehicle body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the protective cover ejection device of the present invention.

[0016] Figure 2 It is a structural schematic diagram of the protective cover ejection device of the present invention installed on the protective cover.

[0017] Figure 3 Unlock the schematic diagram of the structure for the present invention.

[0018] Figure 4 The present invention completes the schematic diagram of the ejection separation structure.

[0019] Markings in the figure: 1-protective cover, 2-power supply cable, 3-igniter, 4-medicine box, 5-cutter, 6-cutting cylinder, 7-cutting board, 8-small mounting cap, 9-shear pin, 10-sealing rubber ring 1, 11-large mounting cap, 12-blocking cover, 13-sealing ring, 14-main structure, 15-sealing rubber ring 2, 16-piston shear pin, 17-unlocking piston, 18-tightening element, 19-escape cap, 20-locking screw, 21-buffer pad, 22-connecting cylinder. DETAILED DESCRIPTION

[0020] The protective cover ejection device will be further described below in conjunction with the accompanying drawings.

[0021] In this protective cover ejection device, the ignition and detonation mechanism, the connection and separation mechanism and the cable cutting mechanism are installed in the protective cover, the ignition and detonation mechanism and the cable cutting mechanism are fixedly connected in the radial direction, and the cable cutting mechanism is located below the ignition and detonation mechanism, and the ignition and detonation mechanism and the connection and separation mechanism are fixedly connected in the axial direction.

[0022] One end of the unlocking piston 17 of the connection and separation mechanism is inserted into the main structure of the ignition and detonation mechanism, and the other end passes through the protective cover 1 and is axially locked by the locking screw 20 to the unlocking piston 17, the escape cap 19 and the connecting tube 22. A buffer pad is provided between the connecting tube 22 and the escape cap 19, and a rolling tightening element 18 is provided between the unlocking piston 17 and the connecting tube 22. An unlocking groove is provided at one end of the unlocking piston 17 near the ignition and detonation mechanism. The tightening element 18 is a steel ball, and the unlocking groove is a groove. In order to prevent the unlocking piston 17 from axial movement due to external impact or vibration, causing the tightening element 18 to roll and unlock, a piston shear pin 16 is provided between the main structure 14 and the unlocking piston 17. Two annular sealing grooves are provided on the unlocking piston 17, and two circles of sealing rubber rings 15 are installed in the sealing grooves.

[0023] The main structure 14 of the ignition and detonation mechanism is sleeved on the outside of the unlocking piston 17, and the ignition and detonation mechanism is fixedly mounted on the protective cover 1. The igniter 3 is connected to one end of the power supply cable 2 and is mounted in the upper mounting hole of the main structure 14. A medicine box 4 is arranged inside the main structure 14, and the medicine box 4 is located below the igniter 3. A cable cutting mechanism is arranged below the medicine box 4. A plugging cover mounting hole for mounting a plugging cover 12 is arranged on the side of the main structure 14 opposite to the unlocking piston 17, and a sealing ring 13 is arranged between the plugging cover 12 and the main structure 14.

[0024] The cutting barrel 6 of the cable cutting mechanism is fixedly connected to the ignition and detonation mechanism. The cutting barrel 6 is installed on the main structure 14 through a large mounting cap 11. A cutter 5 is arranged in the cutting barrel 6, and an anvil 7 is installed below the cutting barrel 6. The cutting barrel 6 is provided with a C-shaped opening groove. The cutter 5 in the cutting barrel 6 is positioned by a shear pin 9. The shear pin 9 is installed in the cutting barrel 6 through a shear mounting hole. The anvil 7 is installed below the cutting barrel 6 and fastened by a small mounting cap 8. There are two annular sealing grooves on the cutting barrel 5, and two circles of sealing rubber rings 10 are installed in the sealing grooves.

[0025] The protective cover ejection device integrates the three functions of the traditional ejection and ejection device into one, with an ignition and detonation mechanism, a connection and separation mechanism, and a cable cutting mechanism, eliminating the need for an explosive transmission device.

[0026] The protective cover ejection device is installed on the protective cover 1, inserted from one side of the protective cover 1, and the escape cap 19 is installed on the right protective cover 1 on the other side through 4 screws, and then the escape cap 19 and the connecting tube 22 are axially locked by the locking screw 20 to realize the locking force loading of the protective cover ejection device, such as Figure 2 .

[0027] During ejection separation, the power supply cable 2 supplies power to the igniter 3, and the igniter 3 ignites the gunpowder in the medicine box 4, generating high-pressure gunpowder gas in the main structure 14, pushing the cable cutting mechanism to complete the cutting of the power supply cable 2. At the same time, the gunpowder gas pushes the unlocking piston 17 to complete the unlocking and ejection movement.

[0028] The main structure 14 includes 4 circular locking holes, 2 radial limiting grooves, 1 igniter mounting hole, 1 cutting barrel mounting hole, a plugging cover mounting hole and a mounting flange. The connecting barrel 22 structure includes 1 locking groove, 2 radial limiting protrusions, and a threaded mounting hole. The cutting barrel 6 structure includes 1 shear pin mounting hole, 1 C-shaped opening groove, and a threaded interface of a small mounting cap 8.

[0029] Figure 3 For the unlocking action, when the groove of the unlocking piston 17 moves to the contact point of the steel ball, the steel ball starts to move inward under the action of the pre-tightening force, and the locking force between the main structure 14 and the connecting cylinder 22 disappears, achieving unlocking.

[0030] Figure 4 For ejection, after the unlocking action is completed, the gunpowder gas continues to push the unlocking piston 17 to move, and the unlocking piston 17 hits the inner boss of the connecting cylinder 22, driving the escape cap 19 and the right side protective cover of the air inlet to start the separation movement. In order to ensure that the separated protective cover has sufficient flight speed, the unlocking piston 17 keeps pushing the connecting cylinder 22 until the unlocking piston 17 hits the inner limit surface of the main structure 14, completing the unlocking piston 17 actuation, and the right side protective cover 1 is quickly thrown away under the drive of the escape cap 19.

[0031] When the protective cover ejection device is assembled alone, the main structure 14 and the connecting tube 22 are pre-jointed, the steel ball is loaded into the locking hole of the main structure 14 and the locking groove of 22, and the unlocking piston 17 is inserted from the left side of the main structure 14 to hold the steel ball and limit the radial movement of the steel ball, so as to realize the axial connection between the main structure 14 and the connecting tube 22. In order to prevent the unlocking piston 17 from axial movement due to external impact or vibration, causing the steel ball to move and unlock, a piston shear pin 16 is inserted between the unlocking piston 17 and the main structure 14, and two annular sealing rings are designed on the unlocking piston 17, and two circles of sealing rubber rings 15 are installed.

[0032] The cutting barrel 6 is installed on the main structure 14 by the large installation cap 11, the cutter 5 is positioned in the cutting barrel 6 by the shear pin 9, the cutter 5 has two annular sealing grooves, and two circles of sealing rubber rings 10 are installed. The lower part of the cutting barrel 6 is a C-shaped opening for installing the self-contained power supply cable 2 in the cutting barrel 6. After the cutting barrel 6, the cutter 5, the shear pin 9, and the large installation cap 11 are installed in place, the power supply cable 2 is pressed into the C-shaped opening below the cutting barrel 6, the cutting board 7 is installed below the cutting barrel 6, and then the small installation cap 8 is tightened to complete the installation of the cutter part.

[0033] The power supply cable 2 is a self-contained cable of the protective cover ejection device, which supplies power to the igniter 3 to realize ignition and detonation of the igniter. The igniter 3 is connected to the power supply cable 2 and installed in the mounting hole above the main structure 14, which is the ignition and detonation mechanism of the protective cover ejection device.

[0034] The gunpowder box 4 is filled with gunpowder, which is an important component of the high-pressure gas driving source. It is loaded from the left side of the main structure 14, and then the sealing ring 13 and the plug cover 12 are installed to realize the construction of the gunpowder gas sealing chamber.

[0035] When the protective cover ejection device is installed on the protective cover, it is inserted from one side of the protective cover, and 4 screws are used to pass through the flange mounting holes of the main structure 14 to install the protective cover ejection device on the left protective cover. On the other side, the escape cap 19 is installed on the right protective cover by 4 screws. A buffer pad 21 is placed between the escape cap 19 and the connecting tube 22, and then the escape cap 19 and the connecting tube 22 are axially locked by the locking screw 20 to realize the locking force loading of the protective cover ejection device, such as Figure 2 .

[0036] During ejection separation, the power supply cable 2 supplies power to the igniter 3, which burns and ignites quickly, and the ignition powder ignites the medicine box 4, quickly generating high-pressure gunpowder gas. The gunpowder gas pushes the cutter 5 in the cutting tube 6, cuts off the shear pin 9, and moves rapidly in a straight line until the cutter 5 hits the anvil 7, cutting the power supply cable 2. At the same time, the gunpowder gas pushes the unlocking piston 17, and the cutting piston shear pin 16 moves rapidly. When the groove of the unlocking piston 17 moves to the contact point of the steel ball, the steel ball begins to move inward under the action of the preload force, and the locking force between the main structure 14 and the connecting tube 22 disappears, achieving unlocking. The gunpowder gas continues to push the unlocking piston 17 to move, and the unlocking piston 17 hits the inner boss of the connecting tube 22, driving the escape cap 19 and the right side protective cover of the air intake duct to start the separation movement. To ensure that the separated protective cover has sufficient flying speed, the unlocking piston 17 keeps pushing the connecting tube 22 until the unlocking piston 17 hits the limit surface inside the main structure 14, completing the actuation of the unlocking piston 17, and the right protective cover is quickly thrown away driven by the escape cap 19.

[0037] The main working principle of the protective cover ejection device is to integrate the igniter, ejection structure and cutting structure into one, with a small, lightweight, integrated and low-cost structure. It is ignited by a single igniter, and the integrated structural design realizes the cutting of the self-contained power supply cable and the ejection separation of the protective cover.

[0038] When the connection is locked, the protective cover ejection device is installed on the protective cover and inserted from one side of the protective cover 1. The main structure 14 is installed on the left protective cover by 4 screws, and the escape cap 19 is installed on the right protective cover by 4 screws on the other side, and then the escape cap 19 and the connecting tube 22 are axially locked by the locking screw 20. The steel ball is in the locking hole between the main structure 14 and the connecting tube 22. Under the support of the unlocking piston 17, the steel ball cannot move radially, which limits the axial relative movement between the main structure 14 and the connecting tube 22. The main structure 14 is designed with a limit groove for limiting radial rotation at the interface with the connecting tube 22 to prevent the main structure 14 and the connecting tube 22 from relative rotation. The loading of the preload force of the protective cover ejection device is achieved by the tightening torque of the locking screw 20.

[0039] During ejection separation, the power supply cable 2 supplies power to the igniter 3, which burns and ignites quickly, and the ignition powder ignites the gunpowder in the medicine box 4, quickly generating high-pressure gunpowder gas. The gunpowder gas pushes the cutter 5 in the cutting tube 6, cuts off the shear pin 9, and moves rapidly in a straight line until the cutter 5 hits the anvil 7, cutting the power supply cable 2. At the same time, the gunpowder gas pushes the unlocking piston 17, and the cutting piston shear pin 16 moves rapidly. When the groove of the unlocking piston 17 moves to the contact point of the steel ball, the steel ball that loses radial support begins to move inward under the action of the preload force, and the locking force between the main structure 14 and the connecting tube 22 disappears, achieving unlocking. The gunpowder gas continues to push the unlocking piston 17 to move, and the unlocking piston 17 hits the inner boss of the connecting tube 22, driving the escape cap 19 and the right side protective cover of the air intake duct to start the separation movement. To ensure that the separated protective cover has sufficient flying speed, the unlocking piston 17 keeps pushing the connecting tube 22 until the unlocking piston 17 hits the limit surface inside the main structure 14, completing the actuation of the unlocking piston 17, and the right protective cover is quickly thrown away driven by the escape cap 19.

[0040] The above shows and describes the basic principles, main structures and advantages of the present invention. It should be understood by those skilled in the art that the present invention may be modified and improved in size and direction without departing from the spirit and scope of the present invention, and these modifications and improvements fall within the scope of the present invention.

Claims

1. A protective cover ejection device, wherein an ignition and detonation mechanism, a connection and separation mechanism, and a cable cutting mechanism are integrated and installed on the protective cover, characterized in that: The ignition and detonation mechanism is fixedly connected to the cable cutting mechanism in the radial direction, and the cable cutting mechanism is located below the ignition and detonation mechanism. The ignition and detonation mechanism is fixedly connected to the connection and separation mechanism in the axial direction. One end of the unlocking piston of the connection and separation mechanism is inserted into the main structure of the ignition and detonation mechanism, and the other end passes through the protective cover to axially lock the unlocking piston, the escape cap and the connecting cylinder by a locking screw. A rolling tightening element is provided between the unlocking piston and the connecting cylinder, and an unlocking groove is provided at one end of the unlocking piston close to the ignition and detonation mechanism. The main structure of the ignition and detonation mechanism is sleeved on the outside of the unlocking piston, a medicine box is provided inside the main structure where the igniter is connected to the power supply cable, and a cable cutting mechanism is installed at the lower end of the main structure. During ejection separation: the power supply cable supplies power to the igniter, which ignites the gunpowder in the cartridge, generates high-pressure gunpowder gas in the main structure, pushes the cable cutting mechanism to complete the cutting of the power supply cable, and at the same time, the gunpowder gas pushes the unlocking piston to complete the unlocking and ejection movement; Unlocking action: When the unlocking piston groove moves to the contact point of the tightening element, the tightening element starts to move inward under the action of the pre-tightening force, and the locking force between the main structure and the connecting cylinder disappears, achieving unlocking.

2. The protective cover ejection device according to claim 1, characterized in that: The igniter is installed in the upper mounting hole of the main structure.

3. The protective cover ejection device according to claim 1 or 2, characterized in that: The cutting cylinder of the cable cutting mechanism is fixedly connected to the main structure of the ignition and detonation mechanism, a cutting knife is arranged in the cutting cylinder, and an anvil is installed under the cutting cylinder.

4. The protective cover ejection device according to claim 2, characterized in that: A piston shear pin is provided between the main structure and the unlocking piston.

5. The protective cover ejection device according to claim 1, characterized in that: A buffer pad is provided between the connecting tube and the escape cap.

6. The protective cover ejection device according to claim 2, characterized in that: A mounting hole for mounting a plugging cover is provided on a side of the main structure opposite to the unlocking piston, and a sealing ring is provided between the plugging cover and the main structure.

7. The protective cover ejection device according to claim 3, characterized in that: The cutting cylinder is installed on the main structure through a large mounting cap. The cutting cylinder is provided with a C-shaped opening groove. The cutter in the cutting cylinder is positioned by a shear pin, which is installed in the shear mounting hole of the cutting cylinder. The anvil is installed under the cutting cylinder and fastened by a small mounting cap.

8. The protective cover ejection device according to claim 3, characterized in that: The cutter is provided with two annular sealing grooves, and two circles of sealing rubber rings are installed in the sealing grooves.

9. The protective cover ejection device according to claim 1, characterized in that: The unlocking piston is provided with two annular sealing grooves, and two circles of sealing rubber rings are installed in the sealing grooves.

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