Device and method for removing interference fit seals from deep-hole small-diameter sockets in rocket engines

Abstract

A device and method for removing the interference fit sealing ring from a small-diameter deep-hole socket in a rocket engine includes: an outer support sleeve fitted over an inner bushing, and the inner bushing fitted over a non-electrically propelled socket; multiple fastening bolts used in conjunction to secure the outer support sleeve, inner bushing, and non-electrically propelled socket; a fixed sleeve and a guide sleeve connected by a threaded pair, and the outer support sleeve and the guide sleeve connected by a threaded pair; a cutting tool fitted inside the guide sleeve, which guides the cutting tool during milling at a fixed axial height; the lower end face of the fixed sleeve abuts against the upper end face of the outer support sleeve, and the internal threads of the fixed sleeve and the outer support sleeve have opposite directions of rotation, thereby ensuring that the axial height between the guide sleeve and the outer support sleeve remains constant during milling at a fixed axial height. This invention is simple in process and convenient in operation, enabling rapid removal of the interference fit sealing ring from a small-diameter deep-hole socket.

Description

Technical Field

[0001] This invention belongs to the field of liquid rocket engine assembly technology, specifically relating to a device and method for quickly removing the interference fit sealing ring of a deep-hole small-diameter socket for a rocket engine. Background Technology

[0002] The seal between the non-electric detonating cable socket and the detonator of a certain liquid rocket engine is an aluminum gasket. The outer diameter of the seal is very close to the inner diameter of the non-electric detonating cable socket. After being tightened to torque, the seal is compressed and expands, forming an interference fit with the bottom of the nozzle. Furthermore, the upper outer diameter exceeds the minor diameter of the non-electric detonating cable socket's internal thread. When replacing the detonator, the seal must be replaced with a new one. In this mating state, complete removal is impossible. Due to the significant depth of the seal and the upper part of the component, it is difficult to operate. Improper force during removal may damage the socket threads and sealing surface, necessitating the replacement of the entire non-electric detonating cable, resulting in a huge waste of resources.

[0003] Currently, a manual removal method is used. This involves utilizing the gap between the outer edge of the deformed aluminum gasket and the inner wall of the relief groove, manually prying open the sealing gasket with a small tool, and continuously applying radial force to "shrink" the aluminum gasket, ultimately allowing the sealing ring to be removed. The main difficulties are: 1) The unique sealing structure means that after tightening to the required torque, the outer diameter of the upper end of the sealing ring is larger than the inner diameter of the non-electrically transmitted explosion socket. To remove the sealing ring, it must be manually operated within the limited space of the relief groove to reduce the outer diameter of the sealing ring.

[0004] 2) The sealing gasket is far from the end face of the product body, making it inconvenient to apply force.

[0005] 3) Both the product body and the sealing ring are made of aluminum alloy. The product is usually anodized. Manual peeling can easily damage the internal threads of the non-electric explosion-proof socket. Once damaged, it cannot be repaired.

[0006] 4) Manual peeling is extremely inefficient, with a single sealing ring taking more than 4 hours to remove. Summary of the Invention

[0007] The technical problem solved by this invention is to overcome the shortcomings of existing manual operations and to propose a device and method for removing the interference fit sealing ring of a deep-hole small-diameter socket in a rocket engine. The process is simple and easy to operate, and it can effectively ensure the quality and lifespan of the product during disassembly.

[0008] The technical solution of the present invention is as follows: Firstly, A device for removing the interference fit sealing ring from a deep-hole small-diameter socket for a rocket engine, comprising: an inner bushing, an outer support sleeve, a guide sleeve, a fixing sleeve, a cutting tool, and fastening bolts; The outer support sleeve is fitted over the inner bushing, and the inner bushing is fitted over the non-electrically explosive socket. The outer support sleeve has multiple threaded holes machined on its wall surface; The fastening bolt is connected to the threaded hole of the outer support sleeve, and the end of the fastening bolt presses the inner bushing against the outer wall of the non-electric explosion-proof socket. Multiple fastening bolts are used together to secure the outer support sleeve to the inner liner and the non-electrically transmitted explosion socket; The fixed sleeve and the guide sleeve are connected by a threaded pair, and the outer support sleeve and the guide sleeve are connected by a threaded pair; the tool is housed inside the guide sleeve, which guides the tool when performing axial height milling. The lower end face of the fixed sleeve is attached to the upper end face of the outer support sleeve. The internal thread of the fixed sleeve and the internal thread of the outer support sleeve are opposite in direction, so that when the tool is milling at a fixed axial height, the axial height between the guide sleeve and the outer support sleeve remains unchanged.

[0009] Preferably, it further includes: a flat washer; The flat washer is installed at the end of the cutting head of the tool. The outer diameter of the cutting head end is larger than the inner diameter of the flat washer to prevent the flat washer from slipping off the cutting tool. During milling, the guide sleeve end face presses the flat washer downwards, thereby preventing chips from damaging the tooling.

[0010] Preferably, the outer wall of the inner bushing is machined with multiple countersunk holes corresponding to the positions of the threaded holes of the outer support sleeve; The end of the fastening bolt is located in the countersunk hole of the inner bushing, pressing the inner bushing tightly against the outer wall of the non-electrically transmitted explosion socket.

[0011] Preferably, the inner liner is made of polytetrafluoroethylene plastic to prevent the fastening bolts from scratching the outer wall of the non-electrically operated explosion-proof socket.

[0012] Preferably, the inner diameter of the outer support sleeve and the outer diameter of the inner bushing are fitted with a clearance. The inner diameter of the inner bushing is clearance-fitted with the outer diameter of the non-electrically transmitted explosion socket. The cutting tool and the guide sleeve are fitted with a clearance.

[0013] Preferably, the guide sleeve is provided with a handle section, a large-diameter threaded section and a small-diameter threaded section along the axial direction; The major diameter thread section and the minor diameter thread section have opposite thread directions; The small-diameter threaded section of the guide sleeve is threadedly connected to the outer support sleeve. The large-diameter threaded section of the guide sleeve is connected to the threaded section of the fixed sleeve.

[0014] Preferably, the outer wall of the non-electric explosion-transfer socket is machined with an external hexagonal structure, and the fastening bolts press the inner bushing tightly against the hexagonal structure of the non-electric explosion-transfer socket.

[0015] Preferably, the axial thickness of the fixed sleeve is used to limit the maximum descent height of the guide sleeve.

[0016] Secondly, The method for removing the interference fit sealing ring of a rocket engine deep-hole small-diameter socket using the device described in the first aspect includes the following steps: 1) Place the inner liner and outer support sleeve onto the outside of the non-electric explosion-transfer socket in sequence, and tighten the bolts to secure the outer support sleeve so that the outer support sleeve, inner liner and non-electric explosion-transfer socket fit tightly together. 2) The cutter passes through the guide sleeve and the fixed sleeve in sequence. The handle on the guide sleeve is rotated to drive the cutter to feed axially until the cutter tip contacts the sealing ring to be removed on the non-electric explosion-proof socket. The fixed sleeve is rotated until the lower end face of the fixed sleeve is tightly fitted with the upper end face of the outer support sleeve to realize the feed limit of the guide sleeve. At this time, the axial position of the guide sleeve is locked. 3) Connect the end of the cutting tool to the power tool, and let the power tool drive the cutting tool to mill the sealing ring to be removed; 4) After milling is completed, loosen the fixing sleeve in the opposite direction, rotate the guide sleeve again to drive the tool to feed axially until the tool tip contacts the sealing ring to be removed, and the milling feed thickness is achieved. 5) Repeat step 4) until both ends of the fixed sleeve are flush with the end faces of the guide sleeve and the outer support sleeve respectively, to complete the thickness milling of the sealing ring to be removed; 6) Disassemble and remove the sealing ring using the extraction device.

[0017] Compared with the prior art, the advantages of the present invention are mainly reflected in the following aspects: 1) This invention provides a device for quickly removing interference fit sealing rings from deep hole small diameter sockets of rocket engines. It adopts the design concept of "thickness reduction method" and uses "locking and positioning, axial pressure, milling and feeding" to thin the middle structure of the sealing ring, replacing the traditional method of directly prying out the gasket.

[0018] 2) This invention provides a device for quickly removing the interference fit sealing ring of a rocket engine deep hole small diameter socket. By matching the dimensions of the outer support sleeve, guide sleeve, fixing sleeve, and cutting tool, the middle part of the sealing ring can be cleverly thinned to 0.5-0.8mm, so as to facilitate manual peeling off of the sealing ring.

[0019] 3) This invention provides a method for quickly removing the interference fit sealing ring of a deep hole small diameter socket for rocket engines. During the removal process, the anodized aluminum alloy sealing surface and thread structure of the product are effectively protected, avoiding damage to the product.

[0020] 4) The present invention provides a mechanical structure for quickly removing interference fit sealing rings from deep hole small diameter sockets of rocket engines. This device is flexible and can be adapted to the interference fit of aluminum sealing rings of different specifications by replacing parts of different sizes, thereby improving the reliability of the gasket removal. Attached Figure Description

[0021] Figure 1 This is a simulation component for a deep-hole small-diameter socket in a rocket engine.

[0022] Figure 2 This is a schematic diagram of the assembly of the sealing ring quick removal device of the present invention.

[0023] Figure 3 This is a schematic diagram of the structure of the quick-removal device for the sealing ring of the present invention.

[0024] Figure 4 This is a schematic diagram of the inner bushing structure of the sealing ring quick removal device of the present invention.

[0025] Figure 5 This is a schematic diagram of the outer circular support sleeve structure of the sealing ring quick removal device of the present invention.

[0026] Figure 6 This is a schematic diagram of the feed guide sleeve structure of the sealing ring quick removal device of the present invention.

[0027] Figure 7 This is a schematic diagram of the fixing sleeve structure of the quick-removal device for the sealing ring of the present invention.

[0028] Figure 8 This is a schematic diagram of the cutting tool structure of the sealing ring quick removal device of the present invention.

[0029] Figure 9 This is a cross-sectional view of the extraction device of the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer and more apparent, preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0031] The directional terms used in this invention, such as up, down, left, and right, are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the invention.

[0032] The present invention provides a quick removal device for an interference fit sealing ring of a deep hole small diameter socket for a rocket engine, comprising: an inner bushing 1, an outer support sleeve 2, a guide sleeve 3, a fixing sleeve 4, a cutting tool 5, a flat washer 6, and a fastening bolt 7. like Figure 3 As shown, the outer support sleeve 2 is fitted outside the inner bushing 1, and the inner bushing 1 is fitted outside the non-electrically transmitted explosion socket. like Figure 5 As shown, the outer support sleeve 2 has multiple threaded holes machined on its wall surface, and the inner bushing 1 has multiple countersunk holes corresponding to the positions of the threaded holes in the outer support sleeve 2 on its outer wall surface; as shown... Figure 4 As shown.

[0033] The fastening bolt 7 is connected to the threaded hole of the outer support sleeve 2. The end of the fastening bolt 7 is located in the countersunk hole of the inner bushing 1, pressing the inner bushing 1 tightly against the outer wall of the non-electric explosion-proof socket. Multiple fastening bolts 7 are used together to secure the outer support sleeve 2 to the inner liner sleeve 1 and the non-electric explosion-proof socket.

[0034] The inner sleeve 1 is made of polytetrafluoroethylene (PTFE) plastic and is used to prevent the fastening bolt 7 from scratching the outer wall of the non-electrically operated explosion-proof socket. The inner diameter of the outer support sleeve 2 and the outer diameter of the inner sleeve 1 are clearance-fitted. The inner diameter of the inner sleeve 1 and the outer diameter of the non-electrically operated explosion-proof socket are clearance-fitted.

[0035] The outer wall of the non-electrically operated detonator has a hexagonal structure machined on it. Fastening bolt 7 presses the inner bushing 1 tightly against the hexagonal structure of the non-electrically operated detonator. (Example: A rocket engine deep-hole small-diameter socket simulator...) Figure 1 As shown.

[0036] In one embodiment of the present invention, the outer support sleeve has two circumferentially arranged columns. There are 3 threaded holes for installing fastening bolts 7.

[0037] like Figure 6 As shown, the guide sleeve 3 is provided with a handle section, a major diameter threaded section and a minor diameter threaded section along the axial direction; the threads of the major diameter threaded section and the minor diameter threaded section have opposite directions. The cutting tool 5 is a carbide cutting tool. The cutting tool 5 is fitted inside the guide sleeve 3 with a clearance fit. The guide sleeve 3 is used to guide the cutting tool 5 when performing axial height milling, ensuring that the cutting tool mills coaxially.

[0038] The guide sleeve 3 is threaded to the outer support sleeve 2. In one embodiment of the present invention, the guide sleeve 3 is connected to the outer support sleeve 2 via an M14×1 external thread. Rotating the handle on the guide sleeve 3 drives the tool 5 to feed axially.

[0039] The guide sleeve 3 is threaded to the fixed sleeve 4. In one embodiment of the invention, the guide sleeve 3 is connected to the fixed sleeve 4 via an M16×1.25 external thread, ensuring that the tool 5 feeds axially. The internal thread of the fixed sleeve 4 has the opposite direction to the internal thread of the outer support sleeve 2, and the lower end face of the fixed sleeve 4 is always in contact with the upper end face of the outer support sleeve 2, thereby ensuring that the axial height between the guide sleeve 3 and the outer support sleeve 2 remains unchanged when the tool 5 is milling at a fixed axial height. The structure of the fixed sleeve 4 is as follows: Figure 7 As shown.

[0040] like Figure 9 As shown, the cutting head end of the tool 5 passes through the outer support sleeve 2 and the inner bushing 1 in sequence, and then mills the upper end face of the sealing ring to be removed.

[0041] The thickness of the fixed sleeve 4 is used to ensure that when the tool 5 reaches the final feed position, the seal to be removed is milled to the middle part and 0.5 to 0.8 mm is retained; that is, the fixed sleeve 4 is rotated to fit with the outer support sleeve 2, thereby limiting the maximum descent height of the guide sleeve 3; The square end of the cutting tool 5 is connected to the power tool, which can drive it to mill the end face of the sealing ring to be removed.

[0042] like Figure 8 As shown, the flat washer 6 is installed at the end of the cutting head of the tool 5. The outer diameter of the cutting head end is larger than the inner diameter of the flat washer 6 to prevent the flat washer 6 from slipping off the cutting tool 5. The flat washer 6 is a replaceable part. When the flat washer 6 is working, the end face of the guide sleeve 3 presses the flat washer 6 downward to block the chips and prevent damage to the tooling.

[0043] The method for quickly removing the interference fit sealing ring of a deep-hole small-diameter socket for a rocket engine, as described in this embodiment, is performed according to the following steps: Step 1: As Figure 2 As shown, the inner bushing 1 and the outer support sleeve 2 are installed sequentially on the outside of the non-electric explosion-proof socket. The 6 grooves on the inner bushing 1 are aligned with the 6 threaded holes on the outer support sleeve 2. The 6 fastening bolts 7 are tightened to make the outer support sleeve 2 and the inner bushing 1 fit tightly together, and the inner bushing 1 and the end face of the non-electric explosion-proof socket fit tightly together.

[0044] Step 2: The cutting tool 5 passes through the guide sleeve 3 and the fixed sleeve 4 in sequence, with the cutting tip penetrating deep into the socket. Rotating the handle on the guide sleeve 3 causes the M14×1 external thread on the guide sleeve 3 to engage with the internal thread of the outer support sleeve 2, driving the cutting tool 5 to feed axially until the cutting tip contacts the sealing ring to be removed. Rotating the handle on the fixed sleeve 4 until the lower end face of the fixed sleeve 4 is tightly fitted with the upper end face of the outer support sleeve 2, thus limiting the feed of the guide sleeve 3. At this point, the axial position of the guide sleeve 3 is locked.

[0045] Step 3: Connect the tail end of the cutter 5 to the power tool, which can drive the cutter 5 to mill the sealing ring to be removed.

[0046] Step 4: After milling is completed, loosen the handle on the fixed sleeve 4 in the opposite direction, rotate the handle of the guide sleeve 3 again, rotate along the inner thread of the outer support sleeve 2, and drive the tool 5 to feed axially until the tool head contacts the sealing ring to be removed, and mill the feed thickness.

[0047] Step 5: Repeat the above operation until both ends of the fixing sleeve 4 are flush with the end faces of the guide sleeve 3 and the outer support sleeve 2, respectively. Under the given dimensional chain of each part, the middle of the sealing ring is now milled to a thickness of 0.5-0.8mm. At this thickness, the sealing ring is easy to deform and the milling cutter can be avoided from damaging the non-electrically explosive socket.

[0048] Step Six: Disassemble the assembly and remove the sealing ring manually using tweezers or other tools to remove the sealing ring.

[0049] This invention, through combined use, cleverly thins the middle portion of the sealing ring to 0.5-0.8mm. Simultaneously, it effectively protects the product's sealing surface and thread structure, preventing damage. The thinning process is highly efficient and rapid, reducing the skill requirements for manual operation and supporting quick model changes and maintenance.

[0050] This invention provides a dedicated pad removal device for this product, which uses a milling thickness method to disassemble the product, enabling the rapid removal of interference fit sealing rings from deep-hole small-diameter sockets of different specifications.

[0051] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, simple modifications can be made to the technical solutions of the present invention, and all such modifications fall within the protection scope of the present invention.

[0052] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make possible variations and modifications to the technical solutions of the present invention using the disclosed methods and techniques without departing from the spirit and scope of the invention. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the content of the technical solutions of the present invention, shall fall within the protection scope of the present invention. Where there is no conflict, the embodiments of this application and the technical features thereof can be combined with each other.

[0053] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A device for removing the interference fit sealing ring from a rocket engine deep-hole small-diameter socket, characterized in that, include: Inner liner (1), outer support sleeve (2), guide sleeve (3), fixing sleeve (4), cutting tool (5) and fastening bolt (7); The outer support sleeve (2) is fitted outside the inner bushing (1), and the inner bushing (1) is fitted outside the non-electrically explosive socket; The outer support sleeve (2) has multiple threaded holes machined on its wall surface; The fastening bolt (7) is connected to the threaded hole of the outer support sleeve (2), and the end of the fastening bolt (7) presses the inner bushing (1) against the outer wall of the non-electric explosion-proof socket. Multiple fastening bolts (7) are used together to secure the outer support sleeve (2) to the inner bushing (1) and the non-electric explosion-proof socket; The fixed sleeve (4) is connected to the guide sleeve (3) by a threaded pair, and the outer support sleeve (2) is connected to the guide sleeve (3) by a threaded pair; the cutting tool (5) is fitted inside the guide sleeve (3); The lower end face of the fixed sleeve (4) is attached to the upper end face of the outer support sleeve (2). The internal thread of the fixed sleeve (4) is opposite to the internal thread of the outer support sleeve (2), so that when the tool (5) performs milling at a fixed axial height, the axial height between the guide sleeve (3) and the outer support sleeve (2) remains unchanged.

2. The device for removing the interference fit sealing ring of the deep hole small diameter socket for rocket engines according to claim 1, characterized in that, Also includes: Flat washer (6); The flat washer (6) is installed at the end of the cutting head of the tool (5). The outer diameter of the cutting head end is larger than the inner diameter of the flat washer (6) to prevent the flat washer (6) from slipping off the cutting tool (5); During milling, the end face of the guide sleeve (3) presses the flat washer (6) downward to prevent the chips from damaging the tooling.

3. The device for removing the interference fit sealing ring of the rocket engine deep hole small diameter socket according to claim 1, characterized in that, Multiple countersunk holes are machined on the outer wall of the inner bushing (1) corresponding to the positions of the threaded holes of the outer support sleeve (2); The end of the fastening bolt (7) is located in the countersunk hole of the inner bushing (1), pressing the inner bushing (1) against the outer wall of the non-electric explosion-proof socket.

4. The device for removing the interference fit sealing ring of the rocket engine deep hole small diameter socket according to claim 3, characterized in that, The inner sleeve (1) is made of polytetrafluoroethylene plastic to prevent the fastening bolt (7) from scratching the outer wall of the non-electrically explosive socket.

5. The device for removing the interference fit sealing ring of a rocket engine deep hole small diameter socket according to claim 4, characterized in that, The inner diameter of the outer support sleeve (2) is clearance-fitted with the outer diameter of the inner liner (1); The inner diameter of the inner bushing (1) is clearance-fitted with the outer diameter of the non-electrically transmitted explosion socket; The cutting tool (5) and the guide sleeve (3) are fitted with a clearance.

6. The device for removing the interference fit sealing ring of a rocket engine deep hole small diameter socket according to any one of claims 1-5, characterized in that, The guide sleeve (3) is provided with a handle section, a large diameter thread section and a small diameter thread section along the axial direction; The major diameter thread section and the minor diameter thread section have opposite thread directions; The small-diameter threaded section of the guide sleeve (3) and the outer support sleeve (2) are threaded together; The large-diameter threaded section of the guide sleeve (3) is threadedly connected to the fixed sleeve (4).

7. The device for removing the interference fit sealing ring of a rocket engine deep hole small diameter socket according to claim 6, characterized in that, The outer wall of the non-electric explosion-transfer socket is machined with an external hexagonal structure. The fastening bolt (7) presses the inner bushing (1) against the hexagonal structure of the non-electric explosion-transfer socket.

8. The device for removing the interference fit sealing ring of the deep hole small diameter socket for rocket engines according to claim 7, characterized in that, The axial thickness of the fixed sleeve (4) is used to limit the maximum descent height of the guide sleeve (3).

9. A method for removing the interference fit sealing ring of a rocket engine deep-hole small-diameter socket using the device for removing the interference fit sealing ring as described in claim 8, characterized in that... Including the following steps: 1) Place the inner sleeve (1) and outer support sleeve (2) on the outside of the non-electric explosion-transfer socket in sequence, and tighten the fastening bolt (7) and the outer support sleeve (2) to make the outer support sleeve (2) and the inner sleeve (1) fit tightly with the non-electric explosion-transfer socket. 2) The cutting tool (5) passes through the guide sleeve (3) and the fixed sleeve (4) in sequence. The handle on the guide sleeve (3) is rotated to drive the cutting tool (5) to feed axially until the cutting head of the cutting tool (5) contacts the sealing ring to be removed on the non-electric explosion-proof socket. The fixed sleeve (4) is rotated until the lower end face of the fixed sleeve (4) is tightly fitted with the upper end face of the outer support sleeve (2) to realize the feed limit of the guide sleeve (3). At this time, the axial position of the guide sleeve (3) is locked. 3) Connect the end of the cutter (5) to the power tool, and let the power tool drive the cutter (5) to mill the sealing ring to be removed; 4) After milling, loosen the fixing sleeve (4) in the opposite direction, rotate the guide sleeve (3) again to drive the tool (5) to feed along the axis until the cutting head of the tool (5) contacts the sealing ring to be removed, and mill the feed thickness; 5) Repeat step 4) until the two ends of the fixed sleeve (4) are flush with the end faces of the guide sleeve (3) and the outer support sleeve (2) respectively, to complete the thickness milling of the sealing ring to be removed; 6) Disassemble and remove the sealing ring using the extraction device.

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