A device and method for safely removing a solid rocket engine nozzle plug

Abstract

The present invention relates to a device and method for safely removing a solid rocket engine nozzle plug. By adopting the screw transmission principle and carrying a buffer spring component, a portable manual punching device is constructed, which can achieve the purpose of the operator to perform safe punching operations on the surface of the engine nozzle plug. After completing the punching operation, the engine nozzle plug can be stripped by applying external force to specific holes. The above device and method can meet the needs of safe removal of engine plugs and provide technical support for the smooth implementation of high-altitude simulated ignition tests of solid rocket engines.

Description

Technical Field

[0001] The invention relates to a device and method for safely removing a nozzle plug of a solid rocket engine, in particular to a nozzle plug removal device for a solid rocket engine constructed based on a screw drive principle, and belongs to the field of safety evaluation of solid rocket engines. Background Art

[0002] The high-altitude simulation test of solid rocket engines is an important test method to obtain the internal ballistic performance of the engine in the high-altitude ignition state and to evaluate the safety of the engine's high-altitude ignition process. After the engine is ignited at high altitude, due to the influence of the external low-pressure environment and the dynamic effect of the engine's high-speed flight, a "suction" phenomenon will form at the engine nozzle mouth. In order to fully simulate this phenomenon, before the engine conducts a simulated high-altitude ignition test, it is necessary to open the plug at the engine nozzle mouth, so that the engine cavity is connected to the external low-pressure environment, artificially creating a suction phenomenon at the engine nozzle mouth, so as to achieve the purpose of better simulating the engine's high-altitude flight state. However, in the process of removing the nozzle plug of the engine, there are mainly the following technical difficulties: first, the nozzle plug is small in area and close to the throat liner, and the nozzle design shape is usually concave, so the plug removal process is difficult and may cause damage to the throat liner due to improper operation; second, in order to ensure that the nozzle plug can be completely removed, it is necessary to drill holes on the surface of the plug, and the existing drilling tools cannot meet the needs of drilling holes on the nozzle plug surface due to safety reasons and structural limitations. Therefore, it is urgent to develop a device and method of use that can meet the requirements of safe removal of nozzle plugs for solid rocket engines. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a device for safely removing a nozzle plug of a solid rocket engine, so as to solve the problem of safely removing the nozzle plug of a solid rocket engine.

[0004] In order to solve the existing technical problems, the technical solution adopted by the present invention is: a device for safely removing a solid rocket engine nozzle plug, comprising a drill bit, a screw, a sleeve, a crank handle and a lifting bracket, the tail of the screw is connected to the crank handle, the middle part of the screw is installed in the sleeve, and the head of the screw is connected to the drill bit. When the crank handle is turned, the screw moves along the thread direction and drives the drill bit to rotate forward, thereby realizing drilling on the surface of the solid rocket engine nozzle plug; the sleeve is fixed to the lifting bracket by a fixing clamp.

[0005] In order to prevent the drill bit from accidentally damaging the throat liner due to excessive drilling speed, the device of the present invention also includes a buffer spring, which is installed on the tail of the screw between the sleeve and the crank handle to limit the drilling speed.

[0006] The present invention also discloses a method for safely removing a solid rocket engine nozzle plug, the specific steps of which are:

[0007] Step 1: Fix the solid rocket engine on the workbench using a fixture;

[0008] Step 2: Plan the hole layout and specific drilling locations according to the size of the plugging area;

[0009] Step 3: Adjust the position and height of the lifting bracket to the intended drilling position, clean and wipe the nozzle and the plug surface, and observe and confirm that there are no foreign objects on the nozzle and the plug surface, or other factors that may affect the safety of drilling;

[0010] Step 4: Turn the crank to perform drilling on the surface of the plug. The drilling operation should be performed intermittently. During the drilling process, observe the drilling depth at any time and clean up the residues, debris and other excess materials generated during the drilling process in time.

[0011] Step 5: After the drilling operation is completed, the center hole is used as the main force support point, and external force is applied in the direction of the circumferential hole by using a tool to partially peel off the plugging piece, forming an irregular area of ​​partially peeled plugging piece;

[0012] Step 6: Determine whether to continue the punching operation according to the peeling condition of the plugging piece. If necessary, the peeling operation of the plugging piece is performed after the punching is completed at the corresponding position.

[0013] Step 7: After completing all the stripping operations, use tools to perform subsequent cleaning of the nozzle mouth to make the nozzle mouth smooth and free of sharp blockages and other residues.

[0014] Generally, a suitable hole layout and drilling positions can be adopted according to the size of the plugging area. In particular, the planned hole layout and specific drilling positions described in the present invention at least include a central hole and a plurality of symmetrically arranged circumferential holes.

[0015] The present invention adopts the screw drive principle and is equipped with a spring buffer component, which enables the operator to manually punch holes on the surface of the plug at the engine nozzle. While avoiding the introduction of electric drilling tools such as electric drills, the punching force and depth can be effectively controlled to avoid accidental damage to the throat liner due to punching too fast or too deep. After the drilling operation is completed, the center hole can be used as the main force support point, and external force can be applied in the direction of the circumferential hole to achieve the peeling and removal of the engine nozzle plug. Therefore, the present invention adopts a relatively simple and practical method to provide technical support for the safety evaluation test of the engine high-altitude simulated ignition process.

[0016] Beneficial Effects

[0017] The device of the present invention is compact and can be conveniently adjusted according to the placement and direction of the engine; the device realizes the rotational forward movement of the drill bit based on the screw transmission principle, and one operator can perform manual operation; the device is equipped with a buffer spring, which can effectively control the drilling progress and depth, and avoid damage to the throat lining of the nozzle caused by the drilling operation; the device avoids the use of an external power supply, is suitable for fixing energy-containing products such as rocket engines, and improves the inherent safety of the operation process.

[0018] The present invention uses a relatively simple method to achieve the safe removal of the plug at the engine nozzle, providing technical support for the implementation of the high-altitude simulation test of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a drilling device, which includes: a drill bit 1, a screw rod 2, a sleeve 3, a buffer spring 4, a crank handle 5, a lifting bracket 6, and a fixing clamp 7.

[0020] Figure 2 This is a schematic diagram of the disassembly of the drilling device, which includes: a drill bit 1, a screw 2, a sleeve 3, a buffer spring 4, a crank handle 5, a lifting bracket 6, a fixing clamp 7, a nut 8, and a screw 9.

[0021] Figure 3 It is a schematic diagram of the process of removing the engine nozzle plug, which includes: solid rocket engine 10, nozzle 11, plug 12, center hole 13, circumferential hole 14, area 15 for peeling off part of the plug, workbench 16, and fixture 17. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and by taking a specific embodiment of a nozzle plug removal operation for a certain type of solid rocket engine.

[0023] As attached Figure 1-2As shown, a device for safely removing a plug from an engine nozzle based on the screw drive principle comprises: a drill bit 1, a screw 2, a sleeve 3, a buffer spring 4, a crank 5, a lifting bracket 6, a fixing clamp ring 7, etc. The size of the drill bit 1 should be appropriately selected according to the area of ​​the engine nozzle plug; the screw rod 2 is connected to the crank handle 5 and fixed with a nut 8, and the screw rod 2 is further connected to the drill bit 1 through the sleeve 3. When the operator turns the crank handle 5, the screw rod 2 will move along the thread direction and drive the drill bit 1 to rotate forward, thereby achieving the purpose of drilling a hole on the surface of the engine nozzle plug; the buffer spring 4 is installed on the tail of the screw rod 2 between the sleeve 3 and the crank handle 5, and is mainly used to limit the drilling speed and effectively control the drilling depth, so as to avoid the drill bit 1 accidentally damaging the throat liner due to drilling too fast or too deep; the drill bit 1, the screw 2, the sleeve 3, the buffer spring 4, and the crank handle 5 together constitute the main part of the manual drilling device, and the main body of the manual drilling device is fixed to the lifting bracket 6 by a fixing snap ring 7, and the fixing snap ring 7 is fixed to the lifting bracket 6 by a screw 9, so that the drilling device can be adjusted to a suitable position according to the position of the engine nozzle and the height of the part to be drilled, so as to facilitate the operator to perform the drilling operation.

[0024] As attached Figure 3 As shown, the solid rocket engine 10 is fixed on the workbench 16 by the clamp 17, and after the engine nozzle is exposed to a suitable position, the height of the punching device is adjusted to carry out the punching operation. After the punching operation is completed, the nozzle plug can be stripped and removed using tools such as needle-nosed pliers.

[0025] A specific step of safely removing a solid rocket engine nozzle plug is as follows:

[0026] Step 1: Use the fixture 17 to fix the solid rocket engine 10 on the workbench 16, and expose the engine nozzle 11 to a suitable position, so as to facilitate the operator to carry out the subsequent removal of the nozzle plug;

[0027] Step 2: Plan the hole layout and specific drilling positions according to the size of the plug 12, which should usually include at least one central hole 13 and a number of symmetrically arranged circumferential holes 14;

[0028] Step 3: According to the position of the nozzle plugging piece, adjust the position and height of the lifting bracket 6 to the intended drilling position, clean and wipe the nozzle 11 and the plugging piece 12 surface, and observe and confirm that there are no foreign objects on the nozzle 11 and the plugging piece 12 surface, or other factors that may affect the safety of drilling;

[0029] Step 4: Turn the crank 5 to perform drilling on the surface of the plug 12. The drilling operation should be performed intermittently. During the drilling process, the drilling depth should be observed at any time, and the residues, debris and other excess materials generated during the drilling process should be cleaned up in time.

[0030] Step 5: After the drilling operation is completed, the central hole 13 is used as the main force support point, and a tool such as needle-nosed pliers is used to apply external force in the direction of the circumferential hole 14 to partially peel off the plugging sheet 12, thereby forming an irregular partially peeled plugging sheet area 15;

[0031] Step 6: Determine whether to continue the punching operation according to the peeling condition of the plugging sheet 12. If necessary, continue the peeling operation of the plugging sheet 12 after completing the punching at the corresponding position.

[0032] Step 7: After completing all the stripping operations, use tools such as needle-nosed pliers to perform subsequent cleaning of the nozzle 11 to make the nozzle mouth smooth and free of sharp obstructions and other residues.

[0033] The present invention utilizes a device and method for safely removing a solid rocket engine nozzle plug, which can solve the problem of safely removing the engine nozzle plug and provide technical support for the test of solid rocket engines in a ground simulated high-altitude environment.

Claims

1. A method for safely removing a solid rocket engine nozzle plug, comprising the following steps: The first step is to fix the solid rocket engine (10) on the workbench (16) using a fixture (17); Step 2: planning the hole layout and specific drilling positions according to the size of the plug (12); Step 3: Adjust the position and height of the lifting bracket (6) to the intended drilling position, clean and wipe the surface of the nozzle (11) and the plugging plate (12), and observe and confirm that there are no foreign objects on the surface of the nozzle (11) and the plugging plate (12); Step 4: Turn the crank (5) to perform a drilling operation on the surface of the plug (12). The drilling operation should be performed intermittently. During the drilling process, the drilling depth should be observed at any time, and the residues and debris generated during the drilling process should be cleaned up in time. Step 5: After the drilling operation is completed, the central hole (13) is used as the main force support point, and an external force is applied in the direction of the circumferential hole (14) by using a tool to partially peel off the plugging sheet (12), thereby forming an irregular partially peeled plugging sheet area (15); Step 6: Determine whether to continue the punching operation according to the peeling condition of the plugging sheet (12); if necessary, perform the peeling operation of the plugging sheet (12) after completing the punching at the corresponding position; Step 7: After all stripping operations are completed, use tools to perform subsequent cleaning of the nozzle (11) mouth to make the nozzle (11) mouth smooth and free of sharp obstructions.

2. The method according to claim 1, characterized in that: The planned hole layout and specific hole punching positions at least include a central hole (13) and a plurality of symmetrically arranged circumferential holes (14).

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