Universal airplane spherical fire extinguishing bottle fixing device

Abstract

The invention discloses a universal aircraft spherical fire extinguishing bottle fixing device which comprises a supporting frame, a lifting mechanism, a lateral clamping mechanism and a connector positioning mechanism, the lifting mechanism is installed in the supporting frame in a liftable mode, and the lateral clamping mechanism is composed of at least two clamping assemblies oppositely arranged on the two sides of the supporting frame. The connector positioning mechanism is arranged on the top face of the supporting frame. An operator can complete cutting work through one key only by electrically controlling an operating system, so that the labor intensity is reduced; the cutting path and the cutting depth can be quantified, and the cutting quality is high; notches are smooth, fine grinding is not needed after cutting, and the cutting efficiency is high; loss of the boss is small, and the service life of the fire extinguishing bottle is prolonged; cutting personnel can be qualified for cutting work only by equipment use training, so that the training cost is reduced; the CNC machining center is mature in technology, stable in cutting quality and high in safety; the device is easy to use, convenient to repair and maintain, easy to upgrade and reconstruct, and high in practicability.

Description

Technical Field

[0001] This invention belongs to the field of aviation fire-fighting equipment technology, and in particular relates to a universal aircraft spherical fire extinguisher fixing device. Background Technology

[0002] Aircraft spherical fire extinguishing cylinders are high-pressure gas cylinders. According to U.S. Department of Transportation (DOT) regulations, these cylinders must undergo periodic hydrostatic testing. Only those that pass the hydrostatic test can be reassembled, refilled with extinguishing agent, and put back into service. An aircraft spherical fire extinguishing cylinder consists of a spherical body, filling connector, release connector, pressure switch, explosion cap, and mounting feet. The filling connector, explosion diaphragm, and pressure switch are all welded to protrusions on the surface of the spherical body. Before each hydrostatic test, these welded components must be cut off. After the cylinder passes the test, each component is cleaned, inspected, and repaired according to the component maintenance manual before the cut-off connectors are re-welded back to their corresponding protrusions.

[0003] The existing cutting methods involve manual operation using handheld cutting machines or vertical milling machines. Operators select the appropriate cutting method based on the weld characteristics of the component being cut, interference from surrounding joints, and the component's manual requirements. If a handheld cutting machine is used, a suitable cutting blade is selected, and the weld is circumferentially cut. If a vertical milling machine is used, the corresponding fixture and special cutting tools are selected, the fire extinguisher is placed on the milling machine, and the machine is operated to cut the component from top to bottom.

[0004] The drawbacks of the above manual cutting methods are:

[0005] (1) Cutting operators need to maintain one position for a long time until the cutting is completed, resulting in high labor intensity and low work efficiency.

[0006] (2) The weld is a circular weld, and the joint is surrounded by interference joints. The interference joints of different fire extinguishers have different shapes. Cutting personnel need a lot of training to be competent, and the professional skills of the operators are highly required.

[0007] (3) There are no quantitative indicators for the cutting path and cutting depth. They can only be judged by the operator's experience, and the cutting quality is greatly affected by human factors.

[0008] (4) The cut surface is not smooth, and fine grinding is required after cutting, which is inefficient.

[0009] (5) Significant wear and tear on the boss significantly impacts the lifespan of the fire extinguisher. The fire extinguisher itself has no lifespan limit; as long as the height of the welded boss meets the minimum requirements, it can continue to be used. However, with manual cutting, approximately 4-5 cuts will cause the boss height to fail to meet the requirements, necessitating the disposal of the fire extinguisher.

[0010] (6) Operators typically need 5 years of training and practice to become proficient, and the training costs and duration indirectly increase production costs.

[0011] (7) The cutting process generates significant dust and noise pollution, resulting in a low safety factor for operators. Summary of the Invention

[0012] The purpose of this invention is to provide a universal aircraft spherical fire extinguisher fixing device that is simple in structure, runs smoothly, has good safety performance, is easy to maintain, is highly practical, can reduce the labor intensity of operators, and can improve work efficiency and cutting quality.

[0013] The objective of this invention is achieved through the following technical measures: a universal aircraft spherical fire extinguisher fixing device, characterized in that it includes a three-dimensional frame support for accommodating the fire extinguisher, a lifting mechanism for supporting the bottom of the fire extinguisher, a lateral clamping mechanism for clamping the sides of the fire extinguisher, and a connector positioning mechanism for positioning the fire extinguisher connector. The lifting mechanism is movably installed within the support frame. The lateral clamping mechanism consists of at least two clamping components arranged opposite to each other on both sides of the support frame. The connector positioning mechanism is located on the top surface of the support frame.

[0014] This invention can fix various types of spherical fire extinguisher bottles for aircraft and cooperate with a CNC machining center. Installing the invention on the CNC machining center's worktable ensures that the cut surface of the joint of the fire extinguisher bottle is parallel to the worktable and perpendicular to the cutting tool. The CNC machining center's control system can control the tool's movement based on existing automatic cutting programs. Therefore, operators only need to operate the electrical control system to complete the cutting work with one click, greatly reducing labor intensity. The cutting path and depth are quantifiable, resulting in high cutting quality. The cut is smooth, requiring no fine grinding after cutting, and cutting efficiency is high. Damage to the boss is minimal, significantly extending the lifespan of the fire extinguisher bottle. Cutting personnel only need equipment training to perform the cutting work, greatly reducing training costs. CNC machining center technology is mature, ensuring stable cutting quality and high safety. This invention is simple to use, easy to maintain, and readily adaptable for structural upgrades, making it highly practical.

[0015] The support frame of the present invention is a U-shaped frame, and the lifting mechanism includes a lifting cylinder, a metal base plate parallel to the bottom surface of the U-shaped frame, and a Teflon base plate. The lifting cylinder is located on the bottom surface of the U-shaped frame, and the push rod end of the lifting cylinder is connected to the metal base plate. The Teflon base plate is located on the upper surface of the metal base plate to support the fire extinguishing bottle.

[0016] The Teflon base plate of the present invention includes a first Teflon base plate, or a first Teflon base plate, a second Teflon base plate and a cylindrical support arranged sequentially from bottom to top, or a second Teflon base plate and a cylindrical support. The upper surface of the first Teflon base plate has a spherical surface in the middle that is adapted to the bottom of the fire extinguisher bottle. The second Teflon base plate consists of several pieces. The support is arranged on the upper surface of the second Teflon base plate, and multiple notches in the shape of first clearance openings are formed along the circumference of the upper edge of the support to avoid various interference joints of the fire extinguisher bottle.

[0017] The lateral clamping assembly of the present invention includes a clamping cylinder and a Teflon pad fixed on the side of the U-shaped frame. The push rod of the clamping cylinder is perpendicular to the side of the U-shaped frame and extends into the U-shaped frame to connect with the outer side of the Teflon pad. The inner side of the Teflon pad is a working surface, and a groove is provided in the middle of the pad. Steps are provided on the two side walls of the groove to allow the lateral clamping mechanism to clamp fire extinguishing bottles of different diameters.

[0018] The connector positioning mechanism of the present invention includes a positioning plate, a separable positioning ring for fitting onto a fire extinguisher connector or a boss, and a locking device with a movable locking head. The positioning plate is fixed to the top surface of the U-shaped frame and parallel to the bottom surface of the U-shaped frame. The positioning plate has a notch-shaped opening in the middle. The locking device is disposed on the positioning plate and located beside the opening. Notch-shaped slots are provided on both side walls of the opening. The separable positioning ring is pushed into the slot and located in the opening. The separable positioning ring is locked by moving the locking head of the locking device, or after unlocking, the separable positioning ring can be pulled out of the slot and disengaged from the opening.

[0019] The positioning plate of the present invention is a rectangular plate, and second air-avoiding openings for preventing interference joints of fire extinguishing bottles are provided on both sides of the positioning plate.

[0020] The central hole of the separable positioning ring of the present invention is a threaded hole adapted to the cut joint of the fire extinguisher bottle, or the central hole wall of the separable positioning ring is provided with a groove adapted to the boss of the fire extinguisher bottle.

[0021] The U-shaped frame of the present invention is assembled from a bottom beam, a column, a reinforcing beam, a top beam, and diagonal bracing rods. The lower end of the column is fixed to the bottom beam and the upper end is connected to the top beam. The two ends of the reinforcing beam are connected to the column, and the diagonal bracing rods are arranged between the column and the bottom beam.

[0022] The clamping cylinder of the present invention is mounted on the reinforcing beam on the side of the support frame via a flat plate and an L-shaped plate. The short side plane of the L-shaped plate is connected to the side of the reinforcing beam, and the long side plane of the flat plate is connected to the top surface of the reinforcing beam. The size of the flat plate is adapted to the bottom surface of the clamping cylinder, and the clamping cylinder is fixed to the upper surface of the flat plate.

[0023] Compared with the prior art, the present invention has the following significant effects:

[0024] (1) The control system of the CNC machining center of the present invention can control the operation of the tool according to the existing automatic cutting program. Therefore, the operator can complete the cutting work with one click by only operating the electrical control system, which greatly reduces the labor intensity.

[0025] (2) The control system of the CNC machining center is embedded with an automatic cutting program. The cutting path and cutting depth can be quantified, resulting in high cutting quality and a smooth cut. No fine grinding is required after cutting, and the cutting efficiency is high, which reduces the wear of the boss and can greatly extend the service life of the fire extinguisher.

[0026] (3) With the use of this invention, cutting personnel only need equipment operation training to be competent in cutting work, which greatly reduces training costs.

[0027] (4) CNC machining centers have mature technology, stable cutting quality, and high safety.

[0028] (5) This invention is simple to use, easy to repair and maintain, easy to upgrade and modify, and highly practical.

[0029] (6) The fixing device of the present invention is provided with an air-avoiding opening, which can avoid various interference joints on various spherical fire extinguishing bottles, and has strong versatility.

[0030] (7) This invention uses a closed CNC machining center, which produces no dust during cutting and causes minimal pollution to the environment and operators. Attached Figure Description

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0032] Figure 1 This is a schematic diagram of the fixing device and the worktable of the present invention;

[0033] Figure 2 This is an exploded view of the fixing device of the present invention;

[0034] Figure 3 This is an exploded view of the lateral clamping assembly of the present invention.

[0035] In the diagram: 1-Workbench, 11-Screw Hole, 2-Fixing Device, 21-U-shaped Frame, 211-Bottom Beam, 2111-Frame, 2112-Cylinder Fixing Bottom Beam, 212-Column, 213-Reinforcing Beam, 214-Top Beam, 215-Diagonal Bracing Reinforcing Rod, 22-Seventh Fixing Bolt, 231-Lifting Mechanism, 2311-Lifting Cylinder, 2312-Cylinder Flange, 2313-First Fixing Bolt, 2314-Metal Base Plate, 2315-Second Fixing Bolt, 2316-First Teflon Base Plate, 2316a-Second Teflon Base Plate, 2317-Bracket, 2318-First Shield 233-Clamping assembly, 2331-Clamping cylinder, 2332-Clamping Teflon pad, 2333-L-shaped fixing plate, 2334-Flat fixing plate, 2335-Third fixing bolt, 2336-Fourth fixing bolt, 2337-Fifth fixing bolt, 2338-Bolt / nut, 2339-Bolt, 2340-Groove, 232-Joint positioning mechanism, 2321-Positioning plate, 2322-Separable positioning ring, 2323-Locking device, 2324-Sixth fixing bolt, 2325-Opening, 2326-Joint positioning ring, 2327-Second clearance opening. Detailed Implementation

[0036] The present invention will be further described below through specific embodiments, but this is not a limitation of the present invention. Those skilled in the art can make various modifications or improvements based on the basic idea of ​​the present invention, but as long as they do not depart from the basic idea of ​​the present invention, they are all within the protection scope of the present invention.

[0037] like Figures 1-3 As shown, this invention provides a universal aircraft spherical fire extinguisher bottle fixing device 2, which can fix various types of aircraft spherical fire extinguishers with interference joints of different shapes and positions on their bodies, and ensure that the weld seam of each cut joint is perpendicular to the cutter of the automatic cutting system. The fixing device 2 includes a three-dimensional frame-type support frame for accommodating the fire extinguisher bottle, a lifting mechanism 231 for supporting the bottom of the fire extinguisher bottle, a lateral clamping mechanism for clamping the sides of the fire extinguisher bottle, and a joint positioning mechanism 232 for positioning the fire extinguisher bottle joint. The support frame is a U-shaped frame 21. The lifting mechanism 231 can be lifted and installed in the support frame. The lateral clamping mechanism consists of two clamping components 233 arranged opposite to each other on both sides of the support frame. The joint positioning mechanism 232 is located on the top surface of the support frame.

[0038] The U-shaped frame 21 is mainly composed of a bottom beam 211, a column 212, a reinforcing beam 213, a top beam 214, and a diagonal bracing reinforcing rod 215. The lower end of the column 212 is fixed to the bottom beam 211, and the upper end is connected to the top beam 214. The two ends of the reinforcing beam 213 are connected to the column 212, and the diagonal bracing reinforcing rod 215 is set between the column 212 and the bottom beam 211.

[0039] There are a total of 6 bottom beams 211, 4 of which are frame beams 2111. Two cylinder-fixed bottom beams 2112 are installed inside the frame beams. The frame beams 2111 have positioning through holes that are opposite to the worktable 1 of the CNC machining center. The seventh fixing bolt 22 passes through the through holes of the frame beams 2111 and is installed into the screw holes 11 on the worktable 1 of the CNC machining center.

[0040] The lifting mechanism 231 consists of four lifting cylinders 2311, cylinder flanges 2312, first fixing bolts 2313, a metal base plate 2314, second fixing bolts 2315, a first Teflon base plate 2316, a second Teflon base plate 2316a, and a bracket 2317. The metal base plate 2314 is parallel to the bottom surface of the U-shaped frame 21. Four first fixing bolts 2313 pass through the through holes of the cylinder flange 2312 and are fixed to the lifting cylinders 2311. Another four first fixing bolts 2313 pass through the cylinder flange 2312 and are fixed to the cylinder fixing bolt holes of the cylinder fixing base beam 2112. The metal base plate 2314 has fixing holes opposite to the push rods of the lifting cylinders. Second fixing bolts 2315 pass through the fixing holes and are installed on the push rods, allowing the metal base plate to rise or fall with the lifting cylinders. The protruding part of the second fixing bolt 2315 serves as a positioning bolt for the first Teflon base plate 2316. The first Teflon base plate 2316 has a corresponding positioning hole, and the center of the upper surface of the first Teflon base plate 2316 is a spherical surface that matches the bottom of the spherical fire extinguisher. By aligning the positioning hole of the first Teflon base plate 2316 with the positioning bolt, it can be installed onto the metal base plate 2314. The second Teflon base plate 2316a also has a positioning hole corresponding to the second fixing bolt 2315, and can be directly fitted onto the metal base plate 2314 or placed directly on the first Teflon base plate 2316. The bracket 2317 is placed directly on the second Teflon base plate 2316a. The bracket 2317 is a cylindrical body with multiple first clearance openings 2318 along its circumference on its upper edge to avoid various interfering joints on the fire extinguisher. The metal base plate 2314 is a hollow plate in the middle. The first Teflon base plate 2316 and the second Teflon base plate 2316a are each spliced ​​together from a pair of half plates. By configuring the first Teflon base plate 2316 and the second Teflon base plate 2316a of different thicknesses, and in conjunction with the corresponding brackets 2317, the fixing needs of different fire extinguishing bottles can be met. In practical applications, the Teflon base plate can be a first Teflon base plate, or a first Teflon base plate, a second Teflon base plate and a cylindrical bracket arranged sequentially from bottom to top, or a second Teflon base plate and a cylindrical bracket. Among them, there are several second Teflon base plates of different thicknesses. Through the cylinder and the Teflon base plates of different thicknesses, the working surface height of the lifting base plate can be controlled at the required position, so that the fire extinguishing bottle fixing device of the present invention can meet the fixing needs of various fire extinguishing bottles.

[0041] The lateral clamping assembly 233 is installed on the two reinforcing beams 213 on the left and right sides in the middle of the column of the U-shaped frame 21. The lateral clamping assembly 233 includes a clamping cylinder 2331 fixed on the reinforcing beam 213, a clamping Teflon pad 2332, a flat fixing plate 2334, an L-shaped fixing plate 2333, a third fixing bolt 2335, a fourth fixing bolt 2336, a fifth fixing bolt 2337, a bolt / nut 2338, and a bolt 2339. The push rod of the clamping cylinder 2331 is perpendicular to the side of the U-shaped frame 21 and extends into the U-shaped frame 21. It is connected to the outer side of the clamping Teflon pad 2332 through the third fixing bolt 2335, so that the clamping Teflon pad 2332 can move left and right with the movement of the cylinder. The inner surface of the Teflon pad 2332 serves as the working surface, with a through groove 2340 running vertically through its center. A through hole for fixing is located in the center of the groove 2340, and steps are provided on both sides of the groove 2340 to allow the lateral clamping mechanism to clamp fire extinguishers of different diameters. The clamping cylinder 2331 is mounted on the reinforcing beam on the side of the support frame via a flat fixing plate 2334 and an L-shaped fixing plate 2333. The short side of the L-shaped fixing plate 2333 is connected to the side of the reinforcing beam 213 of the U-shaped frame 21 via a fourth fixing bolt 2336. The long side of the L-shaped fixing plate 2333 is flush with the upper surface of the reinforcing beam 213 of the U-shaped frame 21 and has fixing holes corresponding to those of the flat fixing plate 2334. The top surface of the reinforcing beam 213 has threaded holes, and the flat plate 2334 has through holes corresponding to the top surface of the reinforcing beam 213 and the L-shaped fixing plate 2333, as well as threaded holes corresponding to the fixing holes of the clamping cylinder 2331. The fifth fixing bolt 2337 installs the flat plate 2334 onto the reinforcing beam 213; the bolt / nut 2338 fixes the flat plate 2334 onto the long side plane of the L-shaped fixing plate 2333, increasing the mounting support surface of the clamping cylinder; the flat plate 2334 is adapted to the size of the bottom surface of the clamping cylinder 2331, and the clamping cylinder 2331 is installed onto the flat plate 2334 by bolts 2339 to ensure the smooth movement of the cylinder.

[0042] The connector positioning mechanism 232 consists of a positioning plate 2321, a separable positioning ring 2322 for fitting onto the fire extinguisher bottle connector or boss, a locking device 2323 (existing technology), and a sixth fixing bolt 2324. The positioning plate 2321 is fixed to the top beam 214 of the U-shaped frame 21 by screws 2324 and is parallel to the bottom surface of the U-shaped frame 21. The positioning plate 2321 is also parallel to the worktable 1 of the CNC machining center. The positioning plate has a notch-shaped opening 2325 in the middle, and the separable positioning ring 2322 is installed in the opening 2325. The separable positioning ring 2322 has a one-click disassembly and assembly structure. Specifically, there is a U-shaped groove on each of the two straight edges of the opening 2325, with the opening facing the opposite side, that is, the openings of the two U-shaped grooves are opposite each other. The thickness of the separable positioning ring 2322 is the same as the opening width of the U-shaped groove, its width is the same as the distance between the bottom surfaces of the two U-shaped grooves, and its length is the same as the length of the U-shaped groove. This structure allows the separable positioning ring 2322 to be pushed into or pulled out of the U-shaped groove in one step. This design allows for easy switching of positioning rings, making the automatic cutting system versatile and easy to operate. A connector positioning ring 2326 is located in the middle of the separable positioning ring 2322. The central hole of the connector positioning ring 2326 has a thread or a groove that matches the thread of the connector to be cut or its fixing boss. When the connector to be cut is installed on the thread or groove of the connector positioning ring, the connector positioning ring can fix the cutting surface of the connector and keep it parallel to the worktable 1. The separable positioning rings for different connectors differ only in the thread or groove. This design allows for easy switching of positioning rings, making the automatic cutting system versatile and easy to operate. The locking device 2323 is bolted to the positioning plate 2321 and located beside the opening 2325. The locking device 2323 has a movable locking head. When the separable positioning ring 2322 is fully pushed into the opening 2325 of the positioning plate 2321, the locking head is moved to the separable positioning ring to close the locking device 2323, thus securely locking the separable positioning ring 2322. Then, the lifting cylinder is activated to raise the lifting base plate to support the fire extinguishing bottle, further fixing the fire extinguishing bottle in the set position, achieving secure positioning of the aircraft spherical fire extinguishing bottle. The positioning plate 2321 is a rectangular plate, with second clearance openings 2327 on both sides to prevent interference with the fire extinguishing bottle's connector.

[0043] An automatic cutting system using the aforementioned universal aircraft spherical fire extinguisher fixing device includes a CNC machining center and a universal aircraft spherical fire extinguisher fixing device 2. The CNC machining center is an existing product, and its working area height is sufficient to accommodate the universal aircraft spherical fire extinguisher fixing device 2. Its worktable has fixing screw holes, and the universal aircraft spherical fire extinguisher fixing device 2 is installed on the worktable 1 of the CNC machining center through these screw holes, making the aircraft spherical fire extinguisher fixing device and the CNC machining center worktable a single unit. It can move with the worktable, serving as the worktable for the automatic cutting system of universal aircraft spherical fire extinguishers. The fire extinguisher fixing device 2 ensures that spherical fire extinguishers with various shapes and positions of interference joints can be correctly fixed, and keeps the cutting joint of the fire extinguisher perpendicular to the worktable of the CNC machining center, firmly securing the aircraft spherical fire extinguisher. An automatic cutting program (existing software, written based on engineering survey data of weld seams of various spherical fire extinguisher bottle joints) is embedded in the control system of the CNC machining center to control the tool's running mode, running trajectory, and cutting depth. The automatic cutting program determines the cutting mode of the tool based on the interference around the joint being cut, and sets the running trajectory and cutting depth based on the weld seam size data, so that the tool can either perform circumferential cutting around the weld seam or cut from top to bottom. By positioning the fixture and selecting the program, the corresponding program can be started to make the tool cut the corresponding joint to the required depth along the set mode and trajectory, realizing the automatic cutting of various joints on various spherical fire extinguisher bottles of aircraft.

[0044] This invention marks the first application of CNC machining centers to the cutting of spherical fire extinguisher bottles for aircraft, demonstrating versatility and the ability to meet the cutting requirements of various sizes and joint shapes of these bottles. The control system allows for the setting of functions such as machine spindle speed, feed rate, tool trajectory relative to the workpiece, and tool changing, and also provides the capability to program the machining process.

[0045] To improve the safety and working comfort of the fire extinguisher bottle cutting system, a closed CNC machining center with a machine tool guide rail protective cover can be selected. When installing the fire extinguisher bottle, open the protective door of the CNC machining center, close the protective door after the fire extinguisher bottle is installed, and then carry out cutting to prevent cutting debris from splashing out. This can keep the environment clean and prevent debris from injuring the operator.

[0046] The usage process of this invention is as follows: Select a suitable Teflon base plate and install it onto the metal base plate, then select a suitable separable positioning ring; insert the joint of the fire extinguisher bottle to be cut into the separable positioning ring of the aircraft spherical fire extinguisher bottle fixing device, then install the separable positioning ring along with the fire extinguisher bottle into the U-shaped groove in the opening in the middle of the positioning plate, and then use the locking device to lock the separable positioning ring. If necessary, a bracket corresponding to the fire extinguisher bottle can be placed on the Teflon base plate. Activate the lifting cylinder and clamping cylinder to further fix the fire extinguisher bottle. Select the corresponding cutting program on the control panel of the aircraft spherical fire extinguisher bottle automatic cutting system and start it. The aircraft spherical fire extinguisher bottle automatic cutting system can then start working, and its blades will begin to move according to the trajectory and process set in the program, cutting the joint weld to the set depth.

[0047] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A universal aircraft spherical fire extinguisher fixing device, characterized in that: The device includes a three-dimensional frame support for accommodating fire extinguishing bottles, a lifting mechanism for supporting the bottom of the fire extinguishing bottles, a lateral clamping mechanism for clamping the sides of the fire extinguishing bottles, and a connector positioning mechanism for positioning the fire extinguishing bottle connectors. The lifting mechanism can be lifted and installed within the support frame. The lateral clamping mechanism consists of at least two clamping components arranged opposite to each other on both sides of the support frame. The connector positioning mechanism is located on the top surface of the support frame.

2. The universal aircraft spherical fire extinguisher fixing device according to claim 1, characterized in that: The support frame is a U-shaped frame, and the lifting mechanism includes a lifting cylinder, a metal base plate parallel to the bottom surface of the U-shaped frame, and a Teflon base plate. The lifting cylinder is located on the bottom surface of the U-shaped frame, and the push rod end of the lifting cylinder is connected to the metal base plate. The Teflon base plate is located on the upper surface of the metal base plate to support the fire extinguishing bottle.

3. The universal aircraft spherical fire extinguisher fixing device according to claim 2, characterized in that: The Teflon base plate includes a first Teflon base plate, or a first Teflon base plate, a second Teflon base plate and a cylindrical support arranged sequentially from bottom to top, or a second Teflon base plate and a cylindrical support. The upper surface of the first Teflon base plate has a spherical surface in the middle that is adapted to the bottom of the fire extinguisher bottle. There are several second Teflon base plates. The support is set on the upper surface of the second Teflon base plate, and multiple notches in the shape of first clearance openings are opened along the circumference of the upper edge of the support to avoid various interference joints of the fire extinguisher bottle.

4. The universal aircraft spherical fire extinguisher fixing device according to claim 3, characterized in that: The lateral clamping assembly includes a clamping cylinder and a Teflon pad fixed to the side of the U-shaped frame. The push rod of the clamping cylinder is perpendicular to the side of the U-shaped frame and extends into the U-shaped frame to connect with the outer side of the Teflon pad. The inner side of the Teflon pad is the working surface, with a groove running vertically through its center. Steps are provided on both sides of the groove to allow the lateral clamping mechanism to clamp fire extinguishers of different diameters.

5. The universal aircraft spherical fire extinguisher fixing device according to claim 4, characterized in that: The connector positioning mechanism includes a positioning plate, a separable positioning ring for fitting onto a fire extinguisher bottle connector or protrusion, and a locking device with a movable locking head. The positioning plate is fixed to the top surface of the U-shaped frame and parallel to the bottom surface of the U-shaped frame. The positioning plate has a notch-shaped opening in the middle. The locking device is located on the positioning plate and beside the opening. Notch-shaped slots are provided on both sides of the opening. The separable positioning ring is pushed into the slot and located in the opening. The separable positioning ring can be locked by moving the locking head of the locking device, or after unlocking, the separable positioning ring can be pulled out of the slot and disengaged from the opening.

6. The universal aircraft spherical fire extinguisher fixing device according to claim 5, characterized in that: The positioning plate is a rectangular plate, and second air-avoiding openings for air-avoiding fire extinguishing bottle interference joints are provided on both sides of the positioning plate.

7. The universal aircraft spherical fire extinguisher fixing device according to claim 6, characterized in that: The center hole of the separable positioning ring has a thread or a groove that is adapted to the thread of the cut joint or the joint fixing boss.

8. The universal aircraft spherical fire extinguisher fixing device according to claim 7, characterized in that: The U-shaped frame is assembled from a base beam, uprights, reinforcing beams, a top beam, and diagonal bracing. The lower end of the upright is fixed to the base beam, and the upper end is connected to the top beam. Both ends of the reinforcing beam are connected to the uprights, and the diagonal bracing is located between the uprights and the base beam.

9. The universal aircraft spherical fire extinguisher fixing device according to claim 8, characterized in that: The clamping cylinder is mounted on the reinforcing beam on the side of the support frame via a flat plate and an L-shaped plate. The short side of the L-shaped plate is connected to the side of the reinforcing beam, and the long side of the flat plate is connected to the top surface of the reinforcing beam. The flat plate is adapted to the size of the bottom surface of the clamping cylinder, and the clamping cylinder is fixed to the upper surface of the flat plate.

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