An unmanned helicopter hanging frame device, and its manufacturing method and testing method

Abstract

The present invention discloses an unmanned helicopter hanging frame device, and a manufacturing method and a testing method thereof, and relates to the technical field of unmanned helicopter hanging. The hanging frame device includes a hanging frame, an airtight sensor, a delivery hook connector and a plurality of hanging rope assemblies. The hanging frame includes a central part and a plurality of curved pipes circumferentially distributed on the side wall of the central part. A delivery hook interface for installing the delivery hook connector is opened on the central part. The airtight sensor is arranged on the side wall of the central part. The number of curved pipes is the same as the number of hanging rope assemblies. The end of each curved pipe is provided with a lifting ear that cooperates with the corresponding hanging rope assembly. The present invention has the advantages of reasonable design, efficient lifting and large load-bearing capacity. The arrangement of a plurality of hanging rope assemblies solves the problem of load concentration caused by single-point hanging.

Description

Technical Field

[0001] The present invention relates to the technical field of unmanned helicopter suspension technology, and more particularly to the technical field of an unmanned helicopter suspension frame device, and a manufacturing method and a testing method thereof. Background Art

[0002] Unmanned helicopters have achieved great development due to their unique advantages and are widely used in many fields such as military, police, national security, disaster warning, power grid inspection, aerial photography, etc. Unmanned helicopters play an important role in the fields of heavy-load emergency rescue, airdrop of materials, logistics transportation, etc. Helicopters usually use a tethered suspension structure for material transportation and hovering airdrop. This method does not require much consideration of the external dimensions of the helicopter and the suspended materials, nor does it need to consider the volume limitations of the unmanned helicopter. Existing patents disclose the following technologies:

[0003] Patent publication number CN111017216B, titled "A Monitoring Device and Method for External Hanging Release of Cargo from an Unmanned Helicopter," discloses the following: The device comprises a hanging monitoring device disposed within the aircraft, a cargo hanging device mounted on the aircraft's external hanger cover frame, and an auxiliary hanging device connected below the cargo hanging device. The cargo hanging device is equipped with a weighing sensor, a cargo hanging device proximity sensor, a normal cargo hanging device release actuator, and an emergency release mechanism, all connected to the hanging monitoring device. The auxiliary hanging device is equipped with an auxiliary hanging device proximity sensor and an auxiliary hanging device normal release actuator, all connected to the hanging monitoring device. This invention enables monitoring of the status of externally hung cargo and automatic release from an unmanned helicopter in relatively harsh environments. It features simple operation, high reliability, and good environmental adaptability, enabling rapid cargo release in relatively harsh environments that could endanger the pilot's life.

[0004] The aforementioned patents and existing unmanned helicopter airdrop systems mostly utilize a single-point suspension system. This method concentrates the suspension load stress and places higher demands on the fuselage's structural strength. Some also employ a multi-point suspension system, often with bolted connections at the interfaces. This makes the suspension system complex, time-consuming, and labor-intensive to install. Furthermore, the suspension frame system lacks structural fault monitoring measures, lacking sufficient consideration for the safety of intelligent unmanned helicopters. Furthermore, the tooling used during production is limited in functionality and does not meet the requirements for rapid manufacturing and testing of the suspension delivery system. Summary of the Invention

[0005] The purpose of the present invention is to solve the technical problems of single-point hanging of existing unmanned helicopter airdrop devices, which cause load concentration, small hanging weight and complex installation. The present invention provides an unmanned helicopter hanging frame device, and its manufacturing method and testing method.

[0006] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0007] The first aspect of the present invention provides an unmanned helicopter hanging frame device, including a hanging frame, an airtight sensor, a delivery hook connector and a number of hanging rope assemblies. The hanging frame includes a central part and a plurality of curved pipes circumferentially distributed on the side wall of the central part. The central part is provided with a delivery hook interface for installing the delivery hook connector. The airtight sensor is arranged on the side wall of the central part. The number of curved pipes is the same as the number of hanging rope assemblies, and the end of each curved pipe is provided with a lifting ear that cooperates with the corresponding hanging rope assembly.

[0008] In one embodiment, each hanging rope assembly includes a steel wire rope, a crimped aluminum sleeve, a hook and an anti-detachment hook ring. One end of the steel wire rope passes through the corresponding lifting ear and is locked by the crimped aluminum sleeve. The other end of the steel wire rope is locked to the hook by crimping, and the anti-detachment hook ring is set at the hook opening.

[0009] Specifically, the anti-drop hook is crimped to hold one end of the wire rope in place, while the other end of the wire rope is passed through a hook and crimped with a crimped aluminum sleeve. This design aims to reduce the articulation at the hook, reducing weight while also providing longitudinal and lateral freedom of movement for the hanging frame. During installation, the anti-drop hook is directly attached to the corresponding position on the helicopter body. Each set of crimped aluminum sleeves must be adjusted to ensure that the release hook interface on the centerpiece is directly below the center of gravity of the unmanned helicopter and that the centerpiece is horizontally centered (this is achieved by adjusting the crimped aluminum sleeves, which are then tightened).

[0010] In one embodiment, the bent pipes have the same structure and are bent downward, and a straight pipe is connected between the ends of two adjacent bent pipes to increase strength. The overall shape of the hanging frame is cage-shaped.

[0011] Specifically, a straight tube is the preferred structure, but other structures that meet design requirements are also acceptable. For example, if there are four hanging rope assemblies, the hanging frame would consist of a central member, four curved tubes, four straight tubes, and four hanging lugs. The overall shape of the hanging frame is cage-shaped, creating an internal space that provides swing space for the hanging hooks. The straight tubes not only improve the structural stability and load-bearing capacity of the entire hanging frame, but also limit the swing angle of the hanging hooks.

[0012] In one embodiment, the central piece is provided with a plurality of plug-in holes for plugging in with corresponding bent pipes, and a surfacing groove is provided on the outer circumference of each plug-in hole. One end of each bent pipe is plugged into the corresponding plug-in hole and connected to the central piece by welding.

[0013] Specifically, taking the number of hanging rope assemblies as four as an example, the central part is provided with four plug-in holes for plugging into the bent pipes, and a surfacing groove is provided on the outside of each plug-in hole. The setting of the surfacing groove improves the reliability and air tightness of welding.

[0014] In one embodiment, the other end of each elbow is connected to the corresponding lifting lug by welding.

[0015] Specifically, the lugs are equipped with circular holes that connect to the corresponding elbows. The lugs and elbows are butt-welded together. A step is provided at the joint between the lugs and the elbows to allow for surfacing welding, improving weld reliability and airtightness. The lugs have a certain yaw angle to accommodate the swing angle of the wire rope and the lugs.

[0016] In one embodiment, each curved pipe is a hollow curved pipe, each straight pipe is a hollow straight pipe, an annular airtight channel is provided inside the central piece, each curved pipe is connected to the interior of the corresponding straight pipe, each curved pipe is connected to the annular airtight channel inside the central piece, an airtight sensor is provided on the straight pipe, and the probe of the airtight sensor is located in the annular airtight channel.

[0017] Specifically, both the curved pipe and the straight pipe are hollow tubes. To ensure the airtightness of the hanging frame device, the air passages are distributed inside the curved pipe, the straight pipe, and the central piece and are interconnected. An airtight sensor is set on the rear side of the central piece. The airtight sensor is connected to the central piece through threads and a sealing ring. It is used to detect changes in air pressure in the air passage of the hanging frame device. When in use, the air passage is filled with high-pressure gas. The airtight sensor can measure the air pressure changes in the air passage in real time. If a gas leak occurs during the hanging operation, the airtight sensor will send a signal to the task management system. The task management system will process the alarm and implement emergency measures. The hanging frame will be inspected on the next flight.

[0018] A second aspect of the present invention provides a method for manufacturing an unmanned helicopter hanging frame device, which is used to prepare the above-mentioned unmanned helicopter hanging frame device, comprising the following steps:

[0019] S1. Prepare a processing tool, which includes a base, multiple sets of straight tube positioning members disposed on the base, multiple lifting lug positioning members disposed on the base, a central piece positioning column disposed in the middle of the base, and an upper end compression plate that cooperates with the central piece positioning column to compress the central piece;

[0020] S2. Prepare product components: prepare multiple lifting lugs, multiple bent pipes, multiple straight pipes, a central piece, and an airtight sensor;

[0021] S3. Install the multiple lifting ears in step S2 on the corresponding lifting ear positioning pieces in step S1; install the central piece in step S2 on the top of the central piece positioning column, adjust the position of the central piece on the top of the central piece positioning column, and press it with the upper end compression plate; respectively insert the two ends of each elbow in step S2 into the corresponding lifting ears and the corresponding central piece; install the multiple straight pipes in step S2 on the corresponding straight pipe positioning pieces in step S1, so that the two ends of each straight pipe are respectively connected with the two adjacent elbows;

[0022] S4. Fill the air interface of the airtight sensor of the central component processed in step S3 with argon gas, plug any leaks with plugs, and use an argon arc welder to spot weld the connection between each elbow and the corresponding straight pipe, the connection between each elbow and the corresponding lifting lug, and the connection between each elbow and the corresponding central component. After stress relief, perform full welding to obtain a pre-processed hanging frame device.

[0023] S5. Take out the pre-treatment hanging frame device, perform secondary processing on the central part to reduce the welding deformation, and then perform passivation treatment;

[0024] S6. Install an airtight sensor and a drop hook connector at the corresponding position of the central component processed in step S5, fill the hanging frame device with inert gas, check the airtightness of the hanging frame, and obtain the hanging frame device through the airtightness test.

[0025] The specific process of step S4 is as follows:

[0026] S41. Check the argon arc welding machine and use polishing paper to polish and clean the connection between each elbow and the corresponding straight pipe, the connection between each elbow and the corresponding lifting lug, and the connection between each elbow and the corresponding central piece.

[0027] S42. Fill the air interface of the airtight sensor of the central piece with argon gas. Plug any leaks in the central piece. Seal the ends of each elbow away from the central piece with plugs. Use an argon arc welder to spot weld the joints of each elbow at the central piece first, relieve stress, and then perform full welding.

[0028] S43. Remove the plugs on each elbow, connect each elbow to the corresponding lifting lug, and use an argon arc welding machine to spot weld the connection between each elbow and the corresponding lifting lug first, relieve stress, and then perform full welding.

[0029] Specifically, the purpose of filling with argon is to ensure that when the elbow is welded to the central piece, and when the elbow is welded to the lug, the inside and outside of the pipe are protected by argon, so that defects such as oxidation, hydrogenation, and incomplete welding will not occur.

[0030] A third aspect of the present invention provides a method for testing an unmanned helicopter hanging frame device, which is used to test the hanging frame device manufactured by the above-mentioned manufacturing method of the unmanned helicopter hanging frame device, comprising the following steps:

[0031] S01. Prepare the test fixture. Remove the central positioning column of the processing fixture and replace it with a load simulation test device. The rest of the test fixture is identical to the processing fixture. The load simulation test device includes a linear electric cylinder disposed below the base, a lifting platform disposed above the base and driven by the linear electric cylinder, an elastic damper disposed on the lifting platform, a test hook disposed at the end of the elastic damper, and a force sensor disposed on the lifting platform.

[0032] S02. Install the hanging hook device on the delivery hook connector of the hanging frame device;

[0033] S03. Calibrate the load simulation range required for the test, use the host computer to control the stroke of the linear electric cylinder, and calibrate the upper and lower limit stroke positions of the linear electric cylinder on the host computer;

[0034] S04, the upper computer controls the linear electric cylinder to reset, and the linear electric cylinder extends to the upper limit calibration position;

[0035] S05. Hang the hanging hook device on the test hook on the elastic damper;

[0036] S06. The host computer controls the contraction movement of the linear electric cylinder according to the requirements of different simulated hanging loads;

[0037] S07. Perform a reliability hook opening test on the hanging hook device;

[0038] S08. Repeat steps S03 to S06 to perform a cumulative reliability unhooking test on the hanging hook device.

[0039] Specifically, the hanging hook assembly is a critical system for unmanned helicopters. It performs both hanging and dropping functions, often requiring long-term reliability testing of the hook, requiring thousands of hook and unhook tests. Existing hook unhook tests are time-consuming, require numerous counterweights, and are cumbersome to perform. The invented tooling for the hanging frame assembly incorporates a hook unhook testing function.

[0040] Additionally, a spring damper with a hook is attached to the upper end of the load cell to buffer the linear actuator's energy. The load simulation test device utilizes the force generated by the linear actuator's contraction motion. The test hook on the spring damper connects to the suspension hook assembly to simulate the load weight, enabling simulation of various loads. The load cell features a display to facilitate hook-opening reliability testing under various load conditions. The simulated load is expressed as F = kx, where k is the spring damper's stiffness coefficient and x is its deformation.

[0041] In one embodiment, the specific process of step S03 is as follows:

[0042] S031. The host computer controls the linear electric cylinder to extend until the force sensor displays the minimum hanging load required for simulation, and calibrates the upper limit stroke position of the linear electric cylinder.

[0043] S032. The host computer controls the linear electric cylinder to retract until the force sensor displays the maximum hanging load required for simulation, and calibrates the lower limit stroke of the linear electric cylinder.

[0044] S033. Within the calibrated stroke range of the linear electric cylinder, the hanging loading process is corresponded and the loading is linearly changed, and the calibration is completed.

[0045] The beneficial effects of the present invention are as follows:

[0046] 1. The present invention has a reasonable design, and the arrangement of several hanging rope assemblies solves the problem of load concentration caused by single-point hanging.

[0047] 2. The present invention's anti-drop hook clamps one end of the wire rope through crimping, while the other end of the wire rope is threaded through a hook lug and crimped with a crimping aluminum sleeve. This design aims to reduce the articulation at the hook lug, reducing weight while providing longitudinal and lateral freedom of movement for the hanging frame. During installation, the anti-drop hook is directly attached to the corresponding position on the helicopter body. Adjustment of each set of crimping aluminum sleeves is required to ensure that the release hook interface on the central unit is directly below the center of gravity of the unmanned helicopter and that the central unit is horizontally centered.

[0048] 3. The curved pipe and straight pipe of the present invention are both hollow pipes. In order to meet the airtightness function of the hanging frame device, the air path is distributed inside the curved pipe, straight pipe and central piece and is interconnected. An airtight sensor is set on the rear side of the central piece. The airtight sensor is connected to the central piece through threads and a sealing ring to detect the air pressure changes in the air path of the hanging frame device. When in use, the air path is filled with high-pressure gas. The airtight sensor can measure the air pressure changes in the air path in real time. If a gas leak occurs during the hanging operation, the airtight sensor will send a signal to the task management system. The task management system will process the alarm and implement emergency measures, and the hanging frame will be inspected on the next flight.

[0049] 4. The purpose of filling the processing tool with argon is to ensure that when the elbow is welded to the central piece and when the elbow is welded to the lifting lug, the inside and outside of the pipe are protected by argon, so that defects such as oxidation, hydrogenation and incomplete welding will not occur.

[0050] 5. The hanging hook device of the present invention is a key system of the unmanned helicopter. The processing tooling of the hanging frame device of the present invention has a hanging hook opening test function. This solves the problems of existing hanging hook opening tests, such as long time consumption, large number of counterweights required, and cumbersome manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a structural schematic diagram of an unmanned helicopter hanging frame device of the present invention;

[0052] Figure 2 Yes Figure 1 Schematic diagram of the structure without the hanging rope assembly;

[0053] Figure 3 It is a structural diagram of the central component;

[0054] Figure 4 yes Figure 3 sectional view of

[0055] Figure 5 It is a structural diagram of the coordination between the hanging frame device of an unmanned helicopter and the processing tooling;

[0056] Figure 6 yes Figure 5 A top view of

[0057] Figure 7 yes Figure 6 Cross-sectional view at AA in the middle;

[0058] Figure 8 This is a structural diagram of the coordination between an unmanned helicopter hanging frame device and a test fixture;

[0059] Figure markings: 1-central part, 11-delivery hook interface, 12-sensor installation interface, 13-annular airtight channel, 14-plug-in hole, 2-delivery hook connector, 3-airtight sensor, 4-elbow, 5-lifting ear, 6-straight pipe, 7-hanging rope assembly, 71-crimped aluminum sleeve, 72-wire rope, 73-anti-detachment hook ring, 74-hook, 8-hanging hook device, 101-upper end clamping plate, 102-central part positioning column, 103-straight pipe positioning piece, 104-lifting ear positioning piece, 105-base, 106-linear electric cylinder, 107-force sensor, 108-elastic damper, 109-test hook. DETAILED DESCRIPTION

[0060] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0061] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0062] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. In addition, the terms "first," "second," etc. are used only to distinguish the descriptions and are not to be understood as indicating or implying relative importance.

[0063] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when in use. They 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, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0064] Example 1

[0065] like Figures 1 to 4 As shown, this embodiment provides an unmanned helicopter hanging frame device, including a hanging frame, an airtight sensor 3, a delivery hook connector 2 and a plurality of hanging rope assemblies 7. The hanging frame includes a central part 1 and a plurality of curved pipes 4 circumferentially distributed on the side wall of the central part 1. The central part 1 is provided with a delivery hook interface 11 for installing the delivery hook connector 2. The airtight sensor 3 is arranged on the side wall of the central part 1. The number of curved pipes 4 is the same as the number of hanging rope assemblies 7. The end of each curved pipe 4 is provided with a lifting ear 5 that cooperates with the corresponding hanging rope assembly 7.

[0066] Each hanging rope assembly 7 includes a steel wire rope 72, a crimped aluminum sleeve 71, a hook 74 and an anti-detachment hook ring 73. One end of the steel wire rope 72 passes through the corresponding lifting ear 5 and is locked by the crimped aluminum sleeve 71. The other end of the steel wire rope 72 is locked with the hook 74 by crimping. The anti-detachment hook ring 73 is set at the opening of the hook 74.

[0067] Specifically, the anti-slip hook ring 73 presses one end of the wire rope 72 by crimping, and the other end of the wire rope 72 passes through the hanging ear and is crimped with the crimping aluminum sleeve 71. The purpose of this design is to reduce the hinge structure at the hanging ear and reduce weight, while providing longitudinal and lateral swing freedom for the hanging frame. During installation, the anti-slip hook ring 73 is directly hung on the corresponding position of the helicopter body. It is necessary to adjust each set of crimping aluminum sleeves 71 to ensure that the release hook interface 11 on the central part 1 is located directly below the center of gravity of the unmanned helicopter and to ensure that the central part 1 is horizontally centered (this is achieved by adjusting the crimping aluminum sleeves 71, and then tightening the crimping aluminum sleeves 71 after adjustment). Figure 1 shown.

[0068] Example 2

[0069] This embodiment is a further optimization based on the embodiment 1, specifically:

[0070] Each curved pipe 4 has the same structure and is bent downward. A straight pipe 6 is connected between the ends of two adjacent curved pipes 4 to increase strength. The overall shape of the hanging frame is cage-shaped.

[0071] Specifically, straight tubes 6 are the preferred structure, but other structures that meet design requirements are also acceptable. For example, if there are four hanging rope assemblies 7, the hanging frame comprises a central member 1, four curved tubes 4, four straight tubes 6, and four hanging lugs. The overall shape of the hanging frame is cage-shaped, creating an internal space that provides swing space for the hanging hooks 74. The provision of straight tubes 6 not only improves the structural stability and load-bearing capacity of the entire hanging frame, but also limits the swing angle of the hanging hooks 74.

[0072] Example 3

[0073] This embodiment is further optimized based on embodiment 1 or 2, specifically:

[0074] The central part 1 is provided with a plurality of plug-in holes 14 for plugging with the corresponding elbows 4. A surfacing groove is provided on the outer circumference of each plug-in hole 14. One end of each elbow 4 is plugged into the corresponding plug-in hole 14 and connected to the central part 1 by welding.

[0075] Specifically, taking the number of four hanging rope assemblies 7 as an example, the central part 1 is provided with four plug-in holes 14 for plugging into the bent pipe 4, and a surfacing groove is provided on the outside of each plug-in hole 14. The setting of the surfacing groove improves the reliability and air tightness of welding.

[0076] The other end of each elbow 4 is connected to the corresponding lifting lug 5 by welding.

[0077] Specifically, the lug 5 is provided with a circular hole for inserting into the corresponding elbow 4. The lug 5 and the elbow 4 are butt-welded. The lug 5 is provided with a step at the joint between the lug 5 and the elbow 4 to facilitate overlay welding, improving the reliability and airtightness of the weld. The lug has a certain swing angle to accommodate the swing angle of the wire rope 72 and the lug 5.

[0078] Example 4

[0079] This embodiment is a further optimization based on any one of Embodiments 1 to 3, specifically:

[0080] Each curved pipe 4 is a hollow curved pipe 4, and each straight pipe 6 is a hollow straight pipe 6. An annular airtight channel 13 is provided inside the central part 1. Each curved pipe 4 is connected to the interior of the corresponding straight pipe 6. Each curved pipe 4 is connected to the annular airtight channel 13 inside the central part 1. The airtight sensor 3 is provided on the straight pipe 6, and the probe of the airtight sensor 3 is located in the annular airtight channel 13.

[0081] Specifically, the bend pipe 4 and the straight pipe 6 are both hollow pipes. In order to meet the airtightness function of the hanging frame device, the air path is distributed inside the bend pipe 4, the straight pipe 6 and the central part 1 and is interconnected. An airtight sensor 3 is provided on the rear side of the central part 1. The airtight sensor 3 is connected to the central part 1 through threads and a sealing ring, and is used to detect the air pressure changes in the air path of the hanging frame device. When in use, the air path is filled with high-pressure gas. The airtight sensor 3 can measure the air pressure changes in the air path in real time. If a gas leak occurs during the hanging operation, the airtight sensor 3 will send a signal to the task management system. The task management system will process the alarm and implement emergency measures. The hanging frame will be inspected on the next flight. Figure 2 shown.

[0082] Example 5

[0083] like Figures 5 to 7 As shown, the embodiment provides a method for manufacturing an unmanned helicopter hanging frame device, which is used to prepare the above-mentioned unmanned helicopter hanging frame device, including the following steps:

[0084] S1. Prepare a processing tool, which includes a base 105, multiple sets of straight tube positioning members 103 disposed on the base 105, multiple lifting lug positioning members 104 disposed on the base 105, a central piece positioning column 102 disposed in the middle of the base 105, and an upper end compression plate 101 that cooperates with the central piece positioning column 102 and is used to compress the central piece 1;

[0085] S2. Prepare product components: prepare multiple lifting lugs 5, multiple bent pipes 4, multiple straight pipes 6, a central piece 1, and an airtight sensor 3;

[0086] S3. Install the multiple lifting ears 5 in step S2 on the corresponding lifting ear positioning pieces 104 in step S1; install the central piece 1 in step S2 on top of the central piece positioning column 102, adjust the position of the central piece 1 on the top of the central piece positioning column 102, and press it with the upper end compression plate 101; insert the two ends of each curved pipe 4 in step S2 into the corresponding lifting ears 5 and the corresponding central piece 1 respectively; install the multiple straight pipes 6 in step S2 on the corresponding straight pipe positioning pieces 103 in step S1, so that the two ends of each straight pipe 6 are connected to the two adjacent curved pipes 4 respectively;

[0087] S4. Fill the air interface of the airtight sensor 3 of the central component 1 processed in step S3 with argon gas, plug any leaks with plugs, and use an argon arc welder to spot weld the connection between each bend pipe 4 and the corresponding straight pipe 6, the connection between each bend pipe 4 and the corresponding lifting lug 5, and the connection between each bend pipe 4 and the corresponding central component 1. After stress relief, perform full welding to obtain a pre-processed hanging frame device.

[0088] S5. Take out the pre-treatment hanging frame device, perform secondary processing on the central part 1 to reduce the welding deformation, and then perform passivation treatment;

[0089] S6. Install the airtight sensor 3 and the delivery hook connector 2 at the corresponding position of the central component 1 processed in step S5, fill the hanging frame device with inert gas, check the airtightness of the hanging frame, and obtain the hanging frame device through the airtightness test.

[0090] Example 6

[0091] This embodiment is further optimized based on the embodiment 5, specifically:

[0092] The specific process of step S4 is as follows:

[0093] S41. Check the argon arc welding machine and use polishing paper to polish and clean the connection between each elbow 4 and the corresponding straight pipe 6, the connection between each elbow 4 and the corresponding lifting lug 5, and the connection between each elbow 4 and the corresponding central piece 1.

[0094] S42. Fill the air interface of the airtight sensor 3 of the central piece 1 with argon gas. Plug any leaks in the central piece 1. Seal the ends of the elbows 4 away from the central piece 1 with plugs. Use an argon arc welder to spot weld the joints of the elbows 4 at the central piece 1. After stress relief, perform full welding.

[0095] S43. Remove the plugs on each elbow 4, plug each elbow 4 into the corresponding lifting lug 5, and use an argon arc welding machine to spot weld the connection between each elbow 4 and the corresponding lifting lug 5 first, relieve stress, and then perform full welding.

[0096] Specifically, the purpose of filling with argon is to ensure that when the elbow 4 is welded to the central piece 1 and when the elbow 4 is welded to the lifting lug 5, the inside and outside of the pipe are protected by argon, so that defects such as oxidation, hydrogenation and incomplete welding will not occur.

[0097] Example 7

[0098] like Figure 8 As shown, a testing method for an unmanned helicopter hanging frame device in this embodiment is used to test the hanging frame device manufactured by the above-mentioned manufacturing method of the unmanned helicopter hanging frame device, including the following steps:

[0099] S01. Prepare the test fixture. Remove the central positioning column 102 of the processing fixture and replace it with a load simulation test device. The rest of the test fixture is the same as the processing fixture. The load simulation test device includes a linear electric cylinder 106 disposed below a base 105, a lifting platform disposed above the base 105 and driven by the linear electric cylinder 106, an elastic damper 108 disposed on the lifting platform, a test hook 109 disposed at the end of the elastic damper 108, and a force sensor 107 disposed on the lifting platform.

[0100] S02, installing the hanging hook device 8 on the delivery hook connector 2 of the hanging frame device;

[0101] S03, calibrate the load simulation range required for the test, use the host computer to control the stroke of the linear electric cylinder 106, and calibrate the upper and lower limit stroke positions of the linear electric cylinder 106 on the host computer;

[0102] S031, the host computer controls the linear electric cylinder 106 to extend until the force sensor 107 displays the minimum hanging load required for simulation, and calibrates the upper limit stroke position of the linear electric cylinder 106;

[0103] S032, the host computer controls the linear electric cylinder 106 to retract until the force sensor 107 displays the maximum hanging load required for simulation, and calibrates the lower limit stroke of the linear electric cylinder 106;

[0104] S033. Within the calibrated stroke range of the linear electric cylinder 106, the hanging loading process is completed and the loading is linearly changed, and the calibration is completed;

[0105] S04, the host computer controls the linear electric cylinder 106 to reset, and the linear electric cylinder 106 extends to the upper limit calibration position;

[0106] S05, hanging the hanging hook device 8 and the test hook 109 on the elastic damper 108;

[0107] S06. The host computer controls the contraction movement of the linear electric cylinder 106 according to the requirements of different simulated hanging loads;

[0108] S07, performing a reliability hook opening test on the hanging hook device 8;

[0109] S08 , repeating steps S03 to S06 to perform a cumulative reliability unhooking test on the hanging hook device 8 .

[0110] Specifically, the hanging hook assembly 8 is a critical system for unmanned helicopters. It performs both hanging and dropping functions, typically requiring the hanging hook 74 to undergo long-term reliability testing, requiring thousands of hanging and unhooking tests. Existing hook unhooking tests are time-consuming, require numerous counterweights, and are labor-intensive. The invented tooling for the hanging frame assembly incorporates a hook unhooking test function.

[0111] Additionally, a hooked elastic damper 108 is located at the upper end of the load cell 107. This damper 108 serves to buffer the energy of the linear cylinder 106. The load simulation test device utilizes the force generated by the contraction of the linear cylinder 106. A test hook 109 on the elastic damper 108 connects to the suspension hook assembly 8 to simulate the load weight, enabling simulation of various loads. The load cell 107 includes a display function to facilitate hook-opening reliability testing of the suspension hook assembly 8 under various load conditions. The simulated load is expressed as F = kx, where k is the stiffness coefficient of the elastic damper 108 and x is the deformation of the elastic damper 108.

Claims

1. A method for manufacturing an unmanned helicopter hanging frame device, used for preparing an unmanned helicopter hanging frame device, characterized in that: The unmanned helicopter hanging frame device comprises a hanging frame, an airtight sensor (3), a delivery hook connector (2) and a plurality of hanging rope assemblies (7), wherein the hanging frame comprises a central part (1) and a plurality of curved pipes (4) uniformly distributed on the side wall of the central part (1) in a circumferential direction, the central part (1) is provided with a delivery hook interface (11) for installing the delivery hook connector (2), the airtight sensor (3) is arranged on the side wall of the central part (1), the number of the curved pipes (4) is the same as the number of the hanging rope assemblies (7), and the end of each curved pipe (4) is provided with a hanging ear (5) that cooperates with the corresponding hanging rope assembly (7); The manufacturing method comprises the following steps: S1. Prepare a processing tool, the processing tool comprising a base (105), a plurality of straight tube positioning members (103) arranged on the base (105), a plurality of hanging ear positioning members (104) arranged on the base (105), a central member positioning column (102) arranged in the middle of the base (105), and an upper end compression plate (101) for compressing the central member (1) and cooperating with the central member positioning column (102); S2. Prepare product components: prepare a plurality of the lifting ears (5), a plurality of the bent pipes (4), a plurality of straight pipes (6), a central piece (1), and an airtight sensor (3); S3, installing the plurality of lifting ears (5) in step S2 on the corresponding lifting ear positioning members (104) in step S1; installing the central member (1) in step S2 on the top of the central member positioning column (102), adjusting the position of the central member (1) on the top of the central member positioning column (102), and pressing it with the upper end compression plate (101); inserting the two ends of each of the curved pipes (4) in step S2 into the corresponding lifting ears (5) and the corresponding central member (1); installing the plurality of straight pipes (6) in step S2 on the corresponding straight pipe positioning members (103) in step S1, so that the two ends of each straight pipe (6) are respectively connected to the two adjacent curved pipes (4) by plugging; S4, filling the air interface of the airtight sensor (3) of the central component (1) processed in step S3 with argon gas, plugging any leaking areas with plugs, and using an argon arc welding machine to first spot weld the connection between each of the bent pipes (4) and the corresponding straight pipe (6), the connection between each of the bent pipes (4) and the corresponding lifting lug (5), and the connection between each of the bent pipes (4) and the corresponding central component (1), and then perform full welding after stress relief; S5, taking out the hanging frame device, performing secondary processing on the central part (1) to reduce the welding deformation, and then performing passivation treatment; S6. Install an airtight sensor (3) at the corresponding position of the central component (1) processed in step S5, fill the hanging frame device with inert gas, check the airtightness of the hanging frame, and obtain the hanging frame device through the airtightness test.

2. The method for manufacturing an unmanned helicopter hanging frame device according to claim 1, characterized in that: The specific process of step S4 is as follows: S41, check the argon arc welding machine, use polishing paper to polish and clean the connection between each of the bent pipes (4) and the corresponding straight pipe (6), the connection between each of the bent pipes (4) and the corresponding lifting lug (5), and the connection between each of the bent pipes (4) and the corresponding central piece (1); S42, filling the air interface of the airtight sensor (3) of the central part (1) with argon gas, plugging the leaking part of the central part (1), sealing the end of each of the bent pipes (4) away from the central part (1) with a plug, and using the argon arc welding machine to spot weld the connection between each of the bent pipes (4) and the central part (1), and then perform full welding after stress relief; S43, remove the plugs on each of the bent pipes (4), plug each of the bent pipes (4) into the corresponding lifting lugs (5), and use an argon arc welding machine to spot weld the connection between each of the bent pipes (4) and the corresponding lifting lugs (5), and then perform full welding after stress relief.

3. The method for manufacturing an unmanned helicopter hanging frame device according to claim 1, characterized in that: Each of the hanging rope assemblies (7) comprises a steel wire rope (72), a crimped aluminum sleeve (71), a hook (74) and an anti-detachment hook ring (73); one end of the steel wire rope (72) passes through the corresponding hanging ear (5) and is locked by the crimped aluminum sleeve (71); the other end of the steel wire rope (72) is locked with the hook (74) by crimping; and the anti-detachment hook ring (73) is arranged at the opening of the hook (74).

4. The method for manufacturing an unmanned helicopter hanging frame device according to claim 1, characterized in that: Each of the curved pipes (4) has the same structure and is bent downward. A straight pipe (6) is connected between the ends of two adjacent curved pipes (4) for increasing strength. The overall shape of the hanging frame is cage-shaped.

5. The method for manufacturing an unmanned helicopter hanging frame device according to claim 1, characterized in that: The central component (1) is provided with a plurality of plug holes (14) for plugging and matching with the corresponding bent pipes (4), and a surfacing groove is provided on the outer circumference of each plug hole (14). One end of each bent pipe (4) is plugged into the corresponding plug hole (14) and connected to the central component (1) by welding.

6. The method for manufacturing an unmanned helicopter hanging frame device according to claim 5, characterized in that: The other end of each of the bent pipes (4) is connected to the corresponding lifting lug (5) by welding.

7. The method for manufacturing an unmanned helicopter hanging frame device according to claim 6, characterized in that: Each of the curved pipes (4) is a hollow curved pipe (4), each of the straight pipes (6) is a hollow straight pipe (6), an annular airtight passage (13) is provided inside the central component (1), each of the curved pipes (4) is communicated with the interior of the corresponding straight pipe (6), each of the curved pipes (4) is communicated with the annular airtight passage (13) inside the central component (1), the airtight sensor (3) is provided on the straight pipe (6), and the probe of the airtight sensor (3) is located in the annular airtight passage (13).

8. A method for testing an unmanned helicopter hanging frame device, used for testing a hanging frame device manufactured by the manufacturing method of an unmanned helicopter hanging frame device according to claim 1 or 2, characterized in that: The steps include: S01, prepare a test tool, remove the central part positioning column (102) of the processing tool, and replace the central part positioning column (102) of the processing tool with a load simulation test device. The other structures of the test tool are the same as those of the processing tool. The load simulation test device includes a linear electric cylinder (106) arranged below the base (105), a lifting platform arranged above the base (105) and driven by the linear electric cylinder (106), an elastic damper (108) arranged on the lifting platform, a test hook (109) arranged at the end of the elastic damper (108), and a force sensor (107) arranged on the lifting platform; S02, installing the hanging hook device (8) on the delivery hook connector (2) of the hanging frame device; S03, calibrating the load simulation range required for the test, controlling the stroke of the linear electric cylinder (106) using a host computer, and calibrating the upper and lower limit stroke positions of the linear electric cylinder (106) on the host computer; S04, the host computer controls the linear electric cylinder (106) to reset, and the linear electric cylinder (106) extends to the upper limit calibration position, thereby obtaining a pre-processing hanging frame device; S05, hanging the obtained pre-processed hanging frame device on the test hook (109) on the elastic damper (108); S06, the host computer controls the contraction movement of the linear electric cylinder (106) according to the requirements of different simulated hanging loads; S07, performing a reliability hook opening test on the hanging hook device (8); S08, repeating steps S03 to S06, the hanging hook device (8) performs a cumulative reliability hook opening test.

9. The method for testing an unmanned helicopter hanging frame device according to claim 8, characterized in that: The specific process of step S03 is as follows: S031, using the host computer to control the linear electric cylinder (106) to extend until the force sensor (107) displays the required simulated minimum hanging load, and calibrating the upper limit stroke position of the linear electric cylinder (106); S032, the host computer controls the linear electric cylinder (106) to retract until the force sensor (107) displays the maximum hanging load required for simulation, and calibrates the lower limit stroke of the linear electric cylinder (106); S033. Within the calibrated stroke range of the linear electric cylinder (106), the hanging loading process corresponds to the loading linear change, and the calibration is completed.

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