An explosion-proof spindle unit for solid rocket engine grain shaping

Abstract

The utility model discloses a kind of anti-explosion main shaft units for solid rocket engine grain shaping, comprising: mounting plate, main shaft, cutter, driving motor, the positive pressure passage is passed through and is arranged in the middle of main shaft, further comprising: dust suction assembly is arranged in main shaft, the dust suction assembly includes: dust suction pipe, negative pressure dust collector, the dust suction pipe front end is provided with feed inlet;Wherein, the negative pressure dust collector is communicated with dust suction passage by connecting pipeline, the dust suction pipe front end is provided with the flexible dust suction member of open mouth shape. The utility model is through dust suction pipe cooperation negative pressure dust collector on main shaft, can pass through front end feed inlet and promptly suck away the grain chip generated by cutter cutting grain, avoid its accumulation on grain surface and then cause security risk, while the positive pressure airflow introduced by main shaft middle passage, airflow outwardly blowing can block when negative pressure absorbs grain chip, avoid flammable and explosive grain chip into main shaft interior, to cause greater security risk.

Description

Technical Field

[0001] This utility model relates to the field of propellant grain processing technology, and more specifically, to an explosion-proof spindle unit for shaping propellant grains in solid rocket engines. Background Technology

[0002] The composite solid propellant used in solid rocket motors generally consists of processes such as mixing, casting, curing, and shaping. In order to ensure that the quality and size of the propellant charge meet the engine requirements, a slightly larger amount of propellant is usually filled during casting. The shaping process is to remove the irregular and excess parts of the casting surface of the formed propellant grain to obtain a propellant grain that meets the required size and shape.

[0003] Composite solid propellants are composite materials made by blending oxidizers and fuels. They are highly sensitive to energy stimuli such as mechanical friction, impact, static electricity, and heat. Furthermore, they are rubber elastomer materials, making them difficult to shape and a dangerous process in the industry where safety accidents frequently occur.

[0004] Currently, the end face of engine propellant grains is generally shaped manually or mechanically using turning or milling. When using manual methods, operators need to directly handle the propellant grains, which have good toughness and pose a significant flammability and explosion hazard, making it very dangerous and labor-intensive. Mechanical methods are needed to replace manual operation. Currently, explosion-proof CNC machine tools are commonly used in the industry for turning or milling the end face. When milling and shaping propellant grains with existing milling cutters, a chip removal device is needed to clean up the milled waste to prevent chip accumulation and potential safety accidents after repeated milling. Existing devices, such as patent application number CN2, place the chip removal device at the rear end or side of the milling cutter. The propellant cartridge shaping machine disclosed in 02420162810.6 has a chip removal device located on one side of the milling cutter. However, during milling, the propellant chips generated surround the milling cutter, making it impossible for the device to completely remove the chips during chip removal. This leads to chip accumulation, which, if not cleaned promptly, increases the risk of explosion and can cause accidents during milling. Furthermore, during chip absorption, the chips can easily enter the hollow channel of the spindle, accumulating inside. The small size of the hollow channel amplifies the explosive potential of such accumulation. Existing machine tool milling cutters cannot effectively remove the chips generated during milling of the propellant cartridge's inner wall. Additionally, existing explosion-proof machine tool milling cutters generally lack self-cooling, requiring the machine to be stopped after a period of milling to cool the cutter and prevent overheating from contacting the propellant cartridge and causing an explosion. Utility Model Content

[0005] One object of this invention is to solve at least the aforementioned problems and / or defects, and to provide at least the advantages described below.

[0006] To achieve these objectives and other advantages according to this utility model, an explosion-proof spindle unit for shaping solid rocket motor propellant grains is provided, comprising: a mounting plate; a spindle rotatably mounted on the mounting plate via a spindle box; a cutting tool disposed on the front end face of the spindle for shaping solid rocket motor propellant grains; a drive motor disposed on the spindle box for rotating the spindle in space; a positive pressure channel for introducing positive pressure airflow is provided through the middle of the spindle; and a dust collection assembly disposed on the spindle for cleaning propellant shavings after cutting by the cutting tool, the dust collection assembly comprising: a dust collection tube sleeved on the front end of the spindle and having a double-layer structure in space, the internal cavity of the dust collection tube forming a dust collection channel in space; a negative pressure dust collector mounted on the mounting plate via a bracket; and a feed inlet communicating with the dust collection channel is opened at the front end of the dust collection tube. The negative pressure dust collector is connected to the dust collection channel via a connecting pipe. The positive pressure channel is connected to the outside via a through hole in the middle of the blade. The front end of the dust collection pipe is provided with an open flexible dust collection component. The size of the open end of the flexible dust collection component is larger than the size of the blade, and the blade is installed at the front end of the flexible dust collection component.

[0007] Preferably, it also includes: an infrared temperature sensor mounted on the front end face of the mounting plate via mounting bracket I, which measures the temperature of the cutting tool, and the infrared temperature sensor is communicatively connected to an external control terminal; The suction pipe has a clearance groove on one side for placing an infrared temperature sensor, which is adapted to the length of the suction pipe.

[0008] Preferably, it also includes: a camera mechanism mounted on the mounting plate via mounting bracket II, which acquires the surface structure of the solid rocket motor propellant grain in real time, and the camera mechanism is communicatively connected to an external control terminal; The camera configuration is a binocular camera.

[0009] Preferably, the flexible vacuuming component is made of rubber, and the flexible vacuuming component is detachably connected to the vacuuming hose.

[0010] Preferably, it also includes: a linear module disposed on one side of the mounting plate, and a contact sensor disposed at the output end of the linear module for measuring the solid rocket motor propellant grain, wherein the contact sensor is communicatively connected to an external control terminal.

[0011] Preferably, it also includes: a protective housing for encapsulating the mounting plate, drive motor, negative pressure dust collector, camera mechanism, linear module and contact sensor inside; The protective housing has a through hole I for the main shaft to extend out, a through hole II for cooperating with a binocular camera, and a through hole III for cooperating with a contact sensor on its front end face.

[0012] This invention utilizes a double-layered dust collection pipe mounted on the main shaft in conjunction with a negative pressure dust collector. This allows for the timely removal of drug debris generated during the cutting of the drug cartridge by the cutting tool through the front feed inlet, preventing its accumulation on the drug cartridge surface and thus avoiding potential safety hazards. Simultaneously, the positive pressure airflow introduced into the central channel of the main shaft, blowing outwards, can block the negative pressure absorption of drug debris, preventing flammable and explosive drug debris from entering the main shaft and causing greater safety hazards. The flexible dust collection component can form a wider dust collection coverage area, completely covering the cutting area of ​​the cutting tool. Furthermore, the flexible dust collection component will not cause damage or interference when in contact with the drug cartridge.

[0013] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached image description: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model excluding the protective shell; Figure 3 This is a structural schematic diagram of the present invention excluding the protective housing, linear module, and contact sensor; Figure 4 A sectional view of the spindle and cutting tool; Figure 5 A schematic diagram of the spatial structure of the suction pipe, flexible suction components, and negative pressure dust collector; Figure 6 This is a schematic diagram of the protective shell structure.

[0014] Reference numerals: 1. Protective housing; 2. Dust collection assembly; 3. Mounting plate; 4. Spindle box; 5. Spindle; 51. Positive pressure channel; 6. Cutting tool; 7. Drive motor; 8. Dust collection pipe; 81. Clearance groove; 9. Dust collection channel; 10. Negative pressure dust collector; 11. Flexible dust collection component; 12. Mounting bracket I; 13. Infrared temperature sensor; 14. Mounting bracket II; 15. Camera mechanism; 16. Through hole I; 17. Through hole II; 18. Through hole III; 19. Linear module; 20. Contact sensor. Detailed implementation method: The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description. It should be understood that terms such as "having," "comprising," and "including" as used herein do not exclude the presence or addition of one or more other elements or combinations thereof. It should be noted that in the description of the present invention, the terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Moreover, "above," "on top of," and "on top" can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0015] like Figure 1 An explosion-proof spindle unit for shaping solid rocket motor propellant grains is shown, comprising: a mounting plate 3; a spindle 5 rotatably mounted on the mounting plate 3 via a spindle box 4; a cutting tool 6 disposed on the front end face of the spindle 5 for shaping the solid rocket motor propellant grains; a drive motor 7 disposed on the spindle box 4 for rotating the spindle 5 in space; a positive pressure channel 51 for introducing positive pressure airflow is provided through the middle of the spindle 5; and a dust collection assembly 2 disposed on the spindle 5 for cleaning the propellant shavings after cutting by the cutting tool 6. The dust collection assembly 2 comprises: a dust collection pipe 8 sleeved on the front end of the spindle 5 and having a double-layer structure in space; the internal cavity of the dust collection pipe 8 forms a dust collection channel 9 in space; and a negative pressure dust collector 10 mounted on the mounting plate 3 via a bracket; the front end of the dust collection pipe 8 has an inlet communicating with the dust collection channel 9. The negative pressure dust collector 10 is connected to the dust collection channel 9 through a connecting pipe, and the positive pressure channel 51 is connected to the outside through the through hole in the middle of the blade 6. The front end of the dust collection pipe 8 is provided with an open flexible dust collection component 11. The size of the open end of the flexible dust collection component 11 is larger than the size of the blade 6, and the blade 6 is installed at the front end of the flexible dust collection component 11.

[0016] Working principle: The explosion-proof spindle unit is connected to an external three-degree-of-freedom moving unit to enable the explosion-proof spindle unit to move in space. The moving unit can adjust the displacement and attitude of the unit in the X, Y, and Z dimensions in real time according to the three-dimensional shape data and shaping accuracy requirements of the solid rocket motor propellant grain, ensuring that the tool 6 at the front end of the spindle 5 is accurately aligned with the area to be processed. Subsequently, the drive motor 7 installed on the spindle box 4 transmits power to the spindle 5 through the transmission belt, driving the spindle 5 to rotate the tool 6 at high speed. Under the trajectory guidance of the moving unit, the tool 6 makes smooth contact with the surface of the propellant grain to be processed, and removes excess material through progressive cutting to complete the shaping process. Flammable chemical residues generated during the cutting process must be cleaned up promptly. A double-layered dust collection pipe 8, fitted at the front end of the spindle, forms a sealed dust collection channel 9. Simultaneously, a negative pressure dust collector 10, fixed to the mounting plate 3, is activated, creating a stable negative pressure field within the dust collection channel 9 through the pipeline. Under the influence of this negative pressure, the chemical residues enter the channel from the feed inlet. An inert gas or clean compressed air is passed through a positive pressure channel 51 running through the middle of the spindle. The airflow is transported through the positive pressure channel 51 to the through-hole in the middle of the tool 6 and continuously ejected (ensuring the chemical residues are cleaned). The debris will not enter the spindle, and the incoming gas also cools the tool 6. A positive pressure air curtain higher than the ambient pressure is formed in the cutting area and around the feed inlet of the suction pipe 8, which prevents the debris from entering the channel in the middle of the spindle and avoids the accumulation of debris after cleaning, thus reducing the risk of explosion. The front end of the suction pipe 8 is provided with an open flexible suction component 11. The size of the open end of the flexible suction component 11 is larger than the size of the tool 6, and the tool 6 is installed at the front end of the flexible suction component 11. With this technical solution, the flexible dust-collecting component 11, due to its open design and larger size than the cutting tool 6, can form a wider dust-collecting coverage area, completely covering the cutting area of ​​the cutting tool 6. The design of the flexible dust-collecting component 11 extending from the front end of the cutting tool 6 ensures that the cutting tool 6 can directly contact the drug cartridge for processing, and the flexible dust-collecting component 11 will not interfere with the working process of the cutting tool 6. At the same time, the drug chips generated during cutting are firmly confined within the open range of the flexible dust-collecting component 11. Furthermore, even when the flexible dust-collecting component 11 is squeezed and deformed upon contact with the drug cartridge, it can still absorb the drug chips, and the flexible dust-collecting component 11 will not damage the drug cartridge.

[0017] The above technical solution also includes: an infrared temperature sensor 13 mounted on the front end face of the mounting plate 3 via the mounting bracket I12, which measures the temperature of the tool 6, and the infrared temperature sensor 13 is communicatively connected to an external control terminal. The suction pipe 8 has a recess 81 on one side for placing the infrared temperature sensor 13, and the recess 81 is adapted to the length of the suction pipe 8. With this technical solution, the infrared temperature sensor 13 is securely fixed to the front end of the mounting plate 3 by the mounting bracket I12. The recess 81 on one side of the suction pipe 8 is adapted to the length of the suction pipe 8, providing a mounting position for the infrared temperature sensor 13. The length of the recess 81 is also adapted to the length of the suction pipe 8, ensuring that the infrared light emitted by the infrared sensor can directly act on the cutting tool 6 to collect the temperature of the cutting tool 6. If the temperature of the cutting tool 6 exceeds a preset temperature, the external control terminal sends a command to rotate the cutting head. Simultaneously, inert cooling gas is introduced into the hollow channel of the spindle. The inert cooling gas reaches the front end of the cutting head directly through the channel to cool the cutting head, making temperature measurement more accurate and cooling of the cutting tool 6 more efficient, avoiding the risk of explosion due to excessive temperature.

[0018] The above technical solution also includes: a camera mechanism 15 that is mounted on the mounting plate 3 via a mounting bracket II14 and acquires the three-dimensional shape of the solid rocket motor propellant grain in real time, the camera mechanism 15 being communicatively connected to an external control terminal; The camera mechanism 15 is configured as a binocular camera. Using this technical solution, the processing feed rate is very slow due to the processing of energetic materials, and existing explosion-proof milling machines cannot solve the problem of unnecessary time caused by idle tool operation. This equipment utilizes a high-precision contact sensor 20 in conjunction with a binocular camera to perform high-precision measurement of the propellant surface height. After measurement, the data is returned to the control system to avoid idle strokes. The binocular camera (the binocular camera is from Elson Intelligent Technology, model AT-S1000-04A-D) is mounted on the mounting plate 3 via mounting bracket II 14. The binocular camera acquires the three-dimensional structure of the propellant surface in real time. The acquired three-dimensional structure is compared with the target three-dimensional structure of the propellant surface. Then, the external moving unit drives the spindle and the tool 6 to cut the propellant surface. After cutting, the surface is scanned again by the binocular camera to obtain its three-dimensional structure, and the above cutting process is repeated until the three-dimensional structure of the propellant surface to be processed meets the target three-dimensional structure of the propellant surface, at which point cutting stops. The spindle has an integrated tool change interface at its front end, which allows for the replacement of milling cutters of different sizes according to the size of the propellant cartridge surface, and the cutting of the propellant cartridge surface.

[0019] In the above technical solution, the flexible dust-collecting component is configured with anti-static rubber, and the flexible dust-collecting component is detachably connected to the suction pipe 8. Using this technical solution, the flexible dust-collecting component 11, made of anti-static rubber, has anti-static function, and can conduct the static electricity generated during the cutting process to the grounding structure through the suction pipe 8. Because the equipment itself is grounded through a wire, the static electricity generated during the cutting process can be conducted to the ground, preventing static electricity accumulation from causing the combustion and explosion of the medicine chips. At the same time, the flexible dust-collecting component 11 is detachably connected to the suction pipe 8, facilitating subsequent replacement and cleaning by the staff. Furthermore, when processing large-diameter medicine columns, replacing it with a flexible dust-collecting component 11 with a larger opening diameter ensures coverage of the cutting area, adapting to multi-specification processing and improving the equipment's versatility.

[0020] The above solution also includes: a linear module 19 disposed on one side of the mounting plate 3, and a contact sensor 20 disposed at the output end of the linear module 19 for measuring the propellant grain of the solid rocket motor. The contact sensor 20 is communicatively connected to an external control terminal. Using this technical solution, when it is necessary to detect the propellant grain height, the contact sensor 20, driven by the linear module 19, contacts the propellant grain surface to detect its height. When cutting operations are required, the contact sensor 20 moves backward driven by the linear module 19 to prevent positional interference during machining.

[0021] The above technical solution also includes: a protective housing 1 for encapsulating the mounting plate 3, drive motor 7, negative pressure dust collector 10, camera mechanism 15, linear module 19 and contact sensor 20 inside; The protective housing 1 has a through hole I16 for the spindle to extend out, a through hole II17 for cooperating with the binocular camera, and a through hole III18 for cooperating with the contact sensor 20 on its front end face. This technical solution encapsulates multiple components, including the mounting plate 3, drive motor 7, negative pressure dust collector 10, camera mechanism 15, linear module 19, and contact sensor 20, within the protective housing 1. The protective housing 1 prevents external environmental influence and interference on the internal components. Simultaneously, the through holes I16 and II17 on the front end face of the protective housing 1 ensure the normal operation of the spindle and binocular camera. Through hole III18 ensures that the contact sensor 20, under the action of the linear module 19, can extend outside the protective housing 1 when detection is needed, and retract back into the protective housing 1 after detection, preventing positional interference during processing. The dust suction pipe 8 is installed on the protective housing 1 via a connecting flange. The rear end of the negative pressure dust collector 10 is provided with a collection component (not shown in the figure). The collection component is connected to the negative pressure dust collector 10 via a connecting pipe to collect the medicine debris.

[0022] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An explosion-proof spindle unit for shaping propellant grains in solid rocket motors, comprising: The mounting plate, the main shaft mounted on the mounting plate via a spindle box, the cutting tool on the front end face of the main shaft for shaping solid rocket motor propellant grains, and the drive motor mounted on the spindle box for rotating the main shaft in space are characterized in that a positive pressure channel for introducing positive pressure airflow is provided through the middle of the main shaft, and the mounting plate also includes: a dust collection assembly mounted on the main shaft for cleaning up the propellant debris after cutting by the cutting tool, the dust collection assembly including: a dust collection tube sleeved on the front end of the main shaft and having a double-layer structure in space, the internal cavity of the dust collection tube forming a dust collection channel in space, and a negative pressure dust collector mounted on the mounting plate via a bracket, the front end of the dust collection tube having an inlet communicating with the dust collection channel; The negative pressure dust collector is connected to the dust collection channel via a connecting pipe. The positive pressure channel is connected to the outside via a through hole in the middle of the blade. The front end of the dust collection pipe is provided with an open flexible dust collection component. The size of the open end of the flexible dust collection component is larger than the size of the blade, and the blade is installed at the front end of the flexible dust collection component.

2. The explosion-proof spindle unit for solid rocket motor propellant grain shaping according to claim 1, characterized in that, Also includes: An infrared temperature sensor, mounted on the front face of the mounting plate via mounting bracket I, measures the temperature of the cutting tool and is connected to an external control terminal. The suction pipe has a clearance groove on one side for placing an infrared temperature sensor, which is adapted to the length of the suction pipe.

3. The explosion-proof spindle unit for solid rocket motor propellant grain shaping according to claim 1, characterized in that, Also includes: A camera mechanism is mounted on the mounting plate via mounting bracket II and acquires the three-dimensional shape of the solid rocket motor propellant grain in real time. The camera mechanism is connected to an external control terminal for communication. The camera configuration is a binocular camera.

4. The explosion-proof spindle unit for solid rocket motor propellant grain shaping according to claim 1, characterized in that, The flexible vacuum cleaner component is made of anti-static rubber, and the flexible vacuum cleaner component is detachably connected to the vacuum cleaner tube.

5. The explosion-proof spindle unit for solid rocket motor propellant grain shaping according to claim 1, characterized in that, Also includes: A linear module is installed on one side of the mounting plate, and a contact sensor is installed at the output end of the linear module to measure the propellant grain of the solid rocket motor. The contact sensor is communicatively connected to an external control terminal.

6. The explosion-proof spindle unit for solid rocket motor propellant grain shaping according to claim 1, characterized in that, Also includes: Protective housing used to encapsulate mounting plates, drive motors, negative pressure dust collectors, camera mechanisms, linear modules, and contact sensors. The protective housing has a through hole I for the main shaft to extend out, a through hole II for cooperating with a binocular camera, and a through hole III for cooperating with a contact sensor on its front end face.

Images