Device and method for evaluating reliability of lock hook of motor-assisted drag parachute

Abstract

The invention provides a device and a method for evaluating the reliability of a lock hook of a motor-assisted drag parachute. The device comprises a frame; the stepping motor is arranged on one side of the frame; the mounting support is arranged on the other side of the frame, and the mounting support is used for mounting a drag parachute lock hook; the lead screw is connected with the stepping motor; the sliding rail is arranged on the frame; the sliding frame is connected with the sliding rail, and the sliding frame can slide along the sliding rail; the lock ring is connected with one end of the sliding frame, and the lock ring is used for pushing away or pulling away the drag parachute lock hook; one end of the dynamometer is connected with the other end of the sliding frame, and the other end of the dynamometer is connected with the lead screw; according to the invention, the accuracy and safety of measurement are effectively improved, the cost is reduced, and the production efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of unlocking force detection of aircraft lock, and particularly relates to a device and method for evaluating reliability of a motor-assisted drag chute lock hook. BACKGROUND

[0002] The drag chute is a device for braking by air resistance, used to shorten the landing distance of the aircraft and prolong the service life of the landing gear. The drag chute lock system is an important system for ensuring the normal operation of the drag chute, which includes three states of "false lock", "true lock" and "unlocking". During flight, the drag chute lock is always in the "false lock" state. In the false lock state, the drag resistance pin of the drag chute lock hook fork mechanism enters the limiting hole of the lock shell, which can ensure that the drag chute cabin door is opened abnormally in the air, and the parachute is thrown to avoid unsafe accidents caused by aircraft stall. During the landing and taxiing of the aircraft, the pilot operates to fully insert the sliding block into the lock hook, ensuring that the parachute lock is in the "true lock" state and ensuring successful parachute release. The lock hook with error prevention function can avoid accidents caused by accidental release of the drag chute and improve the stability of the system.

[0003] In order to evaluate the reliability index of the drag chute lock system and expose its potential failure modes, it is necessary to conduct typical function verification tests on the drag chute system on the ground. Although the existing technology also has some reliability test devices for the drag chute system, it still lacks a device specially used for measuring the unlocking force of the aircraft drag chute lock. The traditional measurement method has the problems of inaccurate data and operational risk. For example, the staff directly hangs the lock ring with a tube-type force gauge hook, and applies a pulling force to the rear of the fuselage until the lock hook is unlocked. This method is prone to deviation between the pulling direction and the measured force direction of the lock hook, affecting the accuracy of the measurement results. And in the measurement process, the drag chute is easy to be pulled off at the moment of opening. SUMMARY

[0004] The application provides a device and method for evaluating reliability of a motor-assisted drag chute lock hook, which realizes rapid and safe measurement of the unlocking force of the drag chute lock without changing the process inspection and measurement method. In a first aspect, the application provides a device for evaluating reliability of a motor-assisted drag chute lock hook, which comprises: a shelf; a stepping motor arranged on one side of the shelf; a mounting support arranged on the other side of the shelf, the mounting support being used for mounting the drag chute lock hook; a lead screw connected with the stepping motor; a slide rail arranged on the shelf; a slide carriage connected with the slide rail, the slide carriage being capable of sliding along the slide rail; a lock ring connected to one end of the slide, the lock ring being used to push or pull the resistance umbrella lock hook; a force gauge, one end of the force gauge being connected to the other end of the slide, the other end of the force gauge being connected to the lead screw.

[0005] Preferably, the device further comprises: a motor support provided on one side of the rack, the motor support being used to install the stepper motor.

[0006] Preferably, the device further comprises: a first joint, one end of the force gauge being connected to the other end of the slide through the first joint; a second joint, the other end of the force gauge being connected to the lead screw through the second joint.

[0007] Preferably, the device further comprises: a bent handle cylindrical bolt capable of connecting the first joint and one end of the force gauge.

[0008] Preferably, the installation support comprises: two positioning shafts used to install the resistance umbrella lock hook.

[0009] In a second aspect, the application also provides a motor-assisted resistance umbrella lock hook reliability evaluation method, which is applied to the device as described above, and the method comprises: Step 1, lock reliability evaluation; Step 2, false lock reliability evaluation; Step 3, true lock reliability evaluation.

[0010] Preferably, the step 1 specifically comprises: Step 101, positioning of the resistance umbrella lock hook: keep the resistance umbrella lock hook in an "open" state, adjust the size and position of the installation support positioning shaft, and fix it with a counter sunk screw and a washer to ensure that the resistance umbrella lock is placed horizontally; Step 102, device height and axis adjustment: adjust the height of the slide rail, the installation support and the motor support to ensure that the height of the resistance umbrella lock hook, the slide, the first joint, the second joint and the lead screw are consistent, and the force direction is located on the same straight line; Step 103, turn on the stepper motor and drive the lead screw to slowly move towards the resistance umbrella lock hook, which drives the lock ring at one end of the slide to hit the resistance umbrella lock hook to make the hook close, locks the resistance umbrella lock hook, turns off the motor, and records the force gauge reading.

[0011] Preferably, the step 2 specifically comprises: Step 201, setting a "false lock" state: adjusting the device and setting the resistance umbrella lock hook in the "false lock" state by the method in claim 7; Step 202, starting the switch to make the stepping motor drive the dynamometer to move uniformly along the screw shaft direction to the tension state, gradually increasing the motor torque until the lock hook clamp is pulled open, turning off the motor, recording the dynamometer reading change and removing the lock hook load.

[0012] Preferably, the step 3 specifically comprises: Step 301, setting a "true lock" state: adjusting the device and setting the resistance umbrella lock hook in the "true lock" state by the method in claim 7; Step 302, starting the switch to make the stepping motor drive the dynamometer to move uniformly along the screw shaft direction to the tension state, continuing to increase the motor torque until the predetermined tension is reached, maintaining for an appropriate time, the resistance umbrella lock hook should not be unlocked, turning off the motor, recording the dynamometer reading change and removing the lock hook load.

[0013] The beneficial effects of the present application are: 1) The motor-assisted resistance umbrella lock hook reliability evaluation method solves the problems of unsteady transmission direction and measurement error caused by deviation, improves the measurement efficiency and accuracy of the unlocking force detection, by setting a slide rail group that can slide relatively, using the uniform motion of the screw to drive the lock ring to move along the axial direction.

[0014] 2) The device transmission mechanism of the motor-assisted resistance umbrella lock hook quasi-force reliability evaluation method is simple, reducing the problem of interpolation lag, and the stepping motor controls the load size and positioning accuracy, improving the repeatability of the measurement process.

[0015] 3) The stepping motor of the motor-assisted resistance umbrella lock hook quasi-force reliability evaluation method realizes larger torque output through screw rotation transmission, is universal for unlocking force detection of different types of resistance umbrella lock hooks, can realize fast installation and removal of multiple types of resistance umbrella locks, and greatly reduces the labor cost.

[0016] 4) The stepping motor of the motor-assisted resistance umbrella lock hook quasi-force reliability evaluation method has a self-locking function, which can keep the current position and prevent itself from sliding when the lock hook is pulled open, avoiding the risk of injury to the tester and damage to surrounding machine parts when the test is completed. Therefore, the motor-assisted resistance umbrella lock hook reliability evaluation method adopted by the present application effectively improves the measurement accuracy and safety, reduces the cost, and greatly improves the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structure diagram of a typical resistance umbrella lock hook suitable for the present application; Figure 2 is a schematic diagram of a theoretical model of the measuring device of the present application; Figure 3 is a schematic diagram of a cross-sectional structure of a typical part mounting support applicable to the present application; Figure 4 is a schematic diagram of the structure of a typical part locking ring applicable to the present application; Figure 5 is a schematic diagram of the structure of a first joint and a second joint of a typical part applicable to the present application; Figure 6 is a schematic diagram of the structure of a typical part slide applicable to the present application; Figure 7 is a schematic diagram of the structure of a typical part slide rail applicable to the present application; Figure 8 is a schematic diagram of a theoretical model of a typical stepper motor control module applicable to the present application; Figure 9 is a schematic diagram of a LabVIEW host computer software interface applicable to the present application; Wherein: 1. mounting support, 2. locking ring, 3. slide, 4. first joint, 5. bent handle cylindrical bolt, 6. slide rail, 7. dynamometer, 8. second joint, 9. lead screw, 10. stepper motor, 11. motor support, 12. bracket, 13. washer, 14. positioning shaft, 15. countersunk screw, 16. nut, 17. groove. DETAILED DESCRIPTION

[0018] It should be noted that, based on the current social industrial development trend, using driving automation equipment to replace traditional production / detection methods is an effective method to improve production efficiency, improve product quality, reduce human error, and promote technological progress. Stepper motor converts pulse electrical signals into corresponding angular or linear displacement, realizing functions such as starting, reversing, braking, and stepless speed regulation of the device, and is a typical execution element in the control system. At the same time, using the powerful underlying driver and convenient visual programming characteristics of LabVIEW virtual instrument, combined with the controller, driver and stepper motor, an automatic detection device with high portability, high stability and high expandability is an effective solution.

[0019] The application discloses a motor-assisted resistance umbrella lock hook reliability evaluation method, designs a motor-assisted resistance umbrella lock hook quasi-force measuring device composed of a resistance umbrella lock hook fixing mechanism, a force measuring mechanism and a load mechanism and a reliability evaluation method of the resistance umbrella lock hook. The application integrates a through-shaft type linear stepping motor and a resistance umbrella lock hook fixing measuring device, drives a lead screw passing through the center of a rotor to move linearly along a force measuring direction through motor energy supply, enables the connected force measuring mechanism to provide a stable pulling force with consistent direction, linear increase and remote control for the resistance umbrella lock hook, and realizes accurate measurement of the limit pulling force of the resistance umbrella lock hook in the "locking", "real locking" and "false locking" states.

[0020] The resistance umbrella lock hook reliability evaluation method is realized by a quasi-force measuring device composed of a resistance umbrella lock hook fixing mechanism, a force measuring mechanism and a load mechanism. The resistance umbrella lock hook fixing mechanism is composed of a mounting support and two groups of hook positioning shafts, the positioning shafts are matched with the positioning hole size of the resistance umbrella lock hook in size, the resistance umbrella lock force measuring mechanism is composed of a slide rail, a slide carriage, a first joint, a second joint and a force gauge, the slide carriage is limited in the slide rail and can move flexibly in the slide rail, the joints are fixed on the two sides of the slide carriage and are consistent in horizontal height, and the resistance umbrella lock hook load mechanism is composed of a lead screw, a stepping motor and a motor support.

[0021] The position and size of the positioning shaft of the resistance umbrella lock hook fixing mechanism are matched with the shape and size of the clamp head ring of the measured resistance umbrella lock hook, and the positioning shaft is used for fixing the resistance umbrella lock hook, a groove with a diameter is formed at the fixing position of the mounting support positioning shaft, the positioning shaft passes through the groove and is fixed and clamped with the resistance umbrella cap through a countersunk screw, a gasket and a nut, the position of the positioning shaft can be adjusted at any position of the side wall of the mounting support, and the positioning shaft is adapted to and realizes quick mounting and dismounting of multiple types of resistance umbrella locks.

[0022] The resistance umbrella lock hook force measuring mechanism slide rack is composed of a pulley, a small shaft and a slide rack base; the slide rack is limited in the slide rail and can move flexibly in the slide rail, the difference between the slide rail groove width and the maximum width of the slide rack is less than 3 mm, and the difference between the slide rail groove depth and the pulley diameter of the slide rack is less than 3 mm; the upper end of the slide rack is provided with an internal thread hole and is connected and fixed with the lock ring and the first joint and keeps the two joint axis directions and heights consistent; four wheels are installed on the lower end and both sides of the slide rack, and each wheel moves along the slide rail direction; the pulley diameters are the same, the diameter size is matched with the slide rail groove cavity height, and the slide rack base upper end hollow hole axis is horizontal and perpendicular to the slide rail center line; the slide rack base and the pulley are connected through the small shaft, the small shaft both ends are allowed to be punched when the slide rack is assembled, the small shaft is prevented from loosening, and the small shaft connection, the pulley and the slide rail contact are coated with lubricating paste to reduce resistance.

[0023] The resistance umbrella lock hook force measuring mechanism slide rail is formed by bending sheet metal parts, the slide rail plane is horizontally stretched, and the groove surface roughness is less than 1.6; the slide rail lower pad size replaceable support block adjusts the support block height to make the force transmission directions of each mechanism consistent; the slide rail and the support block are fixed on the rack through screws, the screw position does not affect the slide rack wheel movement, the screw position is symmetrical along the slide rail center line, and it is ensured that the slide rail and the support block direction do not deviate when the resistance umbrella lock is stressed.

[0024] The resistance umbrella lock hook force measuring mechanism slide rack center through hole is provided with a lock ring and a first joint fixed by external threads at both ends, the lock ring is connected with the resistance umbrella lock hook, the other end of the first joint is a double lug chuck with a center slot, and a force gauge side clasp is placed in the two lug center through holes, and the two are fixed by a bent handle cylindrical latch; the bent handle cylindrical latch is provided with a ring-shaped groove at the upper end, and a steel cable is bound in the ring-shaped groove for fixing on the bent handle cylindrical latch during force test to prevent the device from being unstable and causing the bent handle cylindrical latch to fall off.

[0025] The resistance umbrella lock hook load mechanism is connected by a shaft coupling between the stepper motor and the lead screw; the motor auxiliary device is composed of a stepper motor, a driver, a controller and a switching power supply; the number of phases, layout angle, rated current and rated voltage parameters of the stepper motor are adjusted according to the resistance umbrella lock hook limit tension requirement; one end of the lead screw is provided with a sliding block nut for cooperation, and the nut moves along the axis without rotating with the lead screw; the pitch of the lead screw is matched with the force size, linear speed and accuracy, the material of the lead screw is mainly high-strength steel or stainless steel to ensure its rigidity and wear resistance; the length of the lead screw is matched with the telescopic length in the force gauge range, and a limit stopper is arranged at the end of the lead screw to avoid over-range movement distance and cause the lead screw to fall off.

[0026] The force transmission directions and heights of each mechanism are consistent, and the tensile strength of each component material is higher than the unlocking limit tension.

[0027] The motor auxiliary resistance umbrella lock hook reliability evaluation method provided by the application contains the following contents: 1) Manufacture and assemble the motor auxiliary resistance umbrella lock hook reliability evaluation device; 2) Resistance umbrella lock hook positioning preparation: adjust the size and position of the positioning shaft of the fixing mechanism, fix it with a countersunk screw and ensure that the resistance umbrella lock is placed horizontally, and adjust the height of the slide rail support block, mounting support and motor support to make the force transmission direction of each mechanism consistent; 3) Motor parameter setting: correctly connect each component and connect and write control programs through LabVIEW host computer software, and test the motor for trial operation; 4) Reliability evaluation: ① Locking reliability evaluation: set the resistance umbrella lock hook to the "locked" state, turn on the stepper motor, drive the lead screw to slowly move in the direction of the resistance umbrella lock hook, drive the slide carriage to hit the lock ring of the resistance umbrella lock hook to make the hook close, lock the resistance umbrella lock hook, turn off the motor, and record the force meter reading.

[0028] ② False lock reliability evaluation: set the resistance umbrella lock hook to the "false lock" state, start the switch, make the stepper motor drive the force meter to move uniformly along the lead screw shaft direction to the tension state, gradually increase the motor torque until the lock hook clamp is pulled open, turn off the motor, record the force meter reading change and remove the lock hook load.

[0029] ③ True lock reliability evaluation: set the resistance umbrella lock hook to the "true lock" state, start the switch, make the stepper motor drive the force meter to move uniformly along the lead screw shaft direction to the tension state, continue to increase the motor torque until the predetermined tension is reached, keep for an appropriate time, and the resistance umbrella lock hook should not be unlocked, turn off the motor, record the force meter reading change and remove the lock hook load.

[0030] 5) Resistance umbrella lock hook unloading: control the stepper motor to move the lead screw in reverse to a certain extent to remove the lock hook load, and sequentially remove the bent handle cylindrical pin, force meter, resistance umbrella lock hook, turn off the motor power, and end the measurement.

[0031] Among them, the maximum axial pull / push force of the stepper motor is 2 times higher than the limit tension of the lock hook, and the commonly used resistance umbrella lock hook unlocking force is 150-250 N.

[0032] Before the stepper motor operates, use LabVIEW host computer software to set parameters such as operating distance and operating speed, and each parameter is selected to match the limit tension of the lock hook.

[0033] The application provides a motor auxiliary resistance umbrella lock hook reliability evaluation method. The resistance umbrella lock hook reliability evaluation method is realized by a lock hook reliability evaluation device composed of a resistance umbrella lock hook fixing mechanism, a force measuring mechanism and a load mechanism. The resistance umbrella lock hook fixing mechanism is composed of a support and multiple sets of lock hook positioning shafts, and the size of the positioning shafts is matched with the size of the lock hook chuck lock ring. The resistance umbrella lock hook force measuring mechanism is composed of a slide rail, a slide carriage, a first joint, a second joint and a force gauge, etc. The slide carriage is limited in the slide rail and can move flexibly in the slide rail. The joints are fixed on both sides of the slide carriage and have consistent horizontal heights. The resistance umbrella lock hook load mechanism is composed of a lead screw, a stepping motor and a motor support. The stepping motor converts electric pulse signals into mechanical angular displacement, drives the lead screw to move at a constant speed in the axial direction, and then the force measuring mechanism is used to transmit force to the resistance umbrella lock hook until it is pulled open.

[0034] Further, the position and size of the positioning shaft of the resistance umbrella lock hook fixing mechanism are matched with the shape and size of the measured resistance umbrella lock hook chuck ring, which is used to fix the resistance umbrella lock hook. A groove with a diameter is opened at the fixing position of the positioning shaft of the support. The positioning shaft passes through the groove and is fixed and clamped with the resistance umbrella lock cap through a counter sunk screw, a gasket and a nut. The position of the positioning shaft can be adjusted at any position of the side wall of the support, which is suitable for and realizes the quick installation and removal of multiple models of resistance umbrella locks.

[0035] Further, the slide carriage of the resistance umbrella lock hook force measuring mechanism is composed of a pulley, a small shaft and a slide carriage base. The slide carriage is limited in the slide rail and can move flexibly in the slide rail. The difference between the groove width of the slide rail and the maximum width of the slide carriage is less than 3 mm, and the difference between the groove depth of the slide rail and the diameter of the slide carriage pulley is less than 3 mm. The upper end of the slide carriage is provided with an internal threaded hole, and is connected and fixed with the two joints while keeping the axial direction and height of the two joints consistent. Four wheels are installed on the lower end and both sides of the slide carriage, and each wheel moves along the slide rail direction. The diameters of the pulleys are the same, and the diameter size is matched with the height of the slide rail groove cavity, and it is ensured that the axis of the hollow hole at the upper end of the slide carriage base is horizontal and perpendicular to the center line of the slide rail. The slide carriage base and the pulley are connected through the small shaft, and the small shaft is allowed to be punched at both ends during assembly to prevent loosening, and lubricating paste is applied at the connection of the small shaft, the contact between the pulley and the slide rail to reduce resistance.

[0036] Further, the slide rail of the resistance umbrella lock hook force measuring mechanism is formed by bending sheet metal parts. The slide rail plane extends horizontally, and the roughness of the groove surface is less than 1.6. The size of the support block under the slide rail can be replaced, and the height of the support block is adjusted to make the force transmission direction of each mechanism consistent. The slide rail and the support block are fixed on the shelf through screws, and the screw position does not affect the movement of the slide carriage wheels. The screw position is symmetrical along the center line of the slide rail, which ensures that the direction of the slide rail and the support block does not deviate when the resistance umbrella lock is under stress.

[0037] Further, the resistance umbrella lock hook force measuring mechanism slide rack center through hole both ends are fixed with external thread lock ring and joint, lock ring and resistance umbrella lock hook chuck buckle connection, the other side first joint end is the center slot double lug chuck, and in the two lug center through hole, slot position place force gauge side snap ring, both by the bent handle cylindrical bolt fixed; The upper end of the bent handle cylindrical bolt is provided with a ring groove, and a steel cable is bound in the ring groove for fixing on the bent handle cylindrical bolt during force test to prevent the device from being unstable and causing the bent handle cylindrical bolt to fall off.

[0038] Further, the resistance umbrella lock hook load mechanism is connected by a shaft coupling between the stepper motor and the lead screw; The electric drive device is composed of a stepper motor, a driver, a controller and a switching power supply; The parameters of the stepper motor, such as the number of phases, the layout angle, the rated current and the rated voltage, are adjusted according to the limit tension of the resistance umbrella lock hook; One end of the lead screw is provided with a sliding block nut for cooperation, and the nut moves along the axis without rotating with the lead screw; The pitch of the lead screw is matched with the force size, linear speed and accuracy, and the material of the lead screw is mainly high-strength steel or stainless steel to ensure its rigidity and wear resistance; The length of the lead screw is matched with the telescopic length within the range of the force gauge, and a limit stopper is arranged at the end of the lead screw to avoid the distance exceeding the range and causing the lead screw to fall off.

[0039] Further, the force transmission direction and height of each mechanism are consistent, and the tensile strength of each component is higher than the unlocking limit tension.

[0040] The use method of the above-mentioned electric drive resistance umbrella lock hook reliability evaluation device comprises the following steps: 1) Resistance umbrella lock hook positioning preparation: adjust the size and position of the positioning shaft of the fixing mechanism, fix it with a countersunk screw and a washer, and ensure that the resistance umbrella lock is placed horizontally; 2) Device height and axis adjustment: adjust the fixing screws of the slide rail and the support block to ensure that the resistance umbrella lock hook, the slide rail and the lead screw are in the same axial direction; Adjust the height of the support block below the slide rail and the support to ensure that the resistance umbrella lock hook, the slide, the joints and the lead screw are consistent in height, so that the force direction is in the same straight line.

[0041] 3) Motor parameter setting: correctly connect the stepper motor, controller, driver, power switch and other components, connect them through LabVIEW host computer software, write a stepper motor motion control program, and test the motor; 4) Lock hook static tension test: start the switch to make the stepper motor drive the force gauge to move uniformly along the lead screw axis to the tension state, gradually increase the motor torque until the lock hook chuck is pulled open, and record the change of the force gauge reading; 5) Resistance umbrella lock hook unloading: control the stepper motor to move the lead screw in reverse to a certain extent to remove the load of the lock hook, and then remove the bent handle cylindrical bolt, the force gauge and the resistance umbrella lock hook in turn, turn off the motor power, and end the measurement.

[0042] The following is combined with Figure 1 -Attached Figure 9 The present application is further described in detail. First, the drag parachute hook device applicable to the device of the present invention is introduced. See attached Figure 1 The typical aircraft drag parachute lock hook device provided in the embodiment is shown in the figure. The drag parachute lock hook is mainly composed of two oppositely arranged hooks, a fork rocker arm group and a ball mechanism, a piston, a slider and other parts. When the drag parachute hanging ring hits the lock hook and causes the hook to close, the piston pushes the slider into the parachute lock under the action of the spring force, putting the parachute lock in a "false lock" state; when the pilot operates the parachute release switch, cold air enters the parachute release chamber, pushing the drag parachute lock slider into the parachute lock, putting the parachute lock in a "false lock" state; when the parachute needs to be released, the pilot operates the switch to open the drag parachute switch, and the drag parachute is separated from the aircraft. Before the test process, the drag parachute lock hook is debugged to the "unlocked" state for testing. The mounting bracket positioning shaft is matched with the drag parachute lock positioning hole to fix it, which can simulate the accurate measurement of the hook's ultimate tension in actual working conditions.

[0043] Next, the design and manufacturing scheme of the device of the present invention are introduced See attached Figure 2 The figure shows a typical aircraft drag parachute hook reliability evaluation device provided in the embodiment. The entire device mainly consists of a mounting bracket 1, a locking ring 2, a slide 3, a first joint 4, a curved cylindrical latch 5, a slide rail 6, a dynamometer 7, a second joint 8, a lead screw 9, a stepper motor 10, a motor support 11, and a frame 12. Various parts and the slide rail are fixed to the frame with screws to ensure that all components are securely fixed during the force transmission measurement.

[0044] See attached Figure 3 The present invention is applicable to drag parachute lock devices for various aircraft models. The drag parachute lock hook is first adjusted to a "false lock" position and positioned on the mounting bracket using two sets of locating shafts. Washers 13 and countersunk screws 15 secure the hook. The two sets of locating shafts align with the drag parachute lock collar and are aligned vertically, ensuring the drag parachute lock hook remains horizontal.

[0045] See attached Figures 4-5 The reference dimensions of the locking ring 2 and first connector 4, typical components of this invention, are shown in the figure. The locking ring 2 is welded together from a half ring, a round rod, and a threaded handle. The cross-sectional diameter of the locking ring matches the clearance size of the drag parachute hook clamp, and the bottom has an M12 external thread. The connector consists of a centrally slotted double-eared clamp fixedly connected to a threaded rod. The double-eared clamp has a vertical through-hole, ensuring that the two holes match the dimensions of the curved cylindrical pin and overlap in the vertical direction. A dynamometer retaining ring is placed in the center groove of the connector 4, and the two are fixed by the curved cylindrical pin 5.

[0046] See attached Figure 6The typical assembly slide 3 of the present application is shown in the figure, which is composed of a slide base, four wheels and four small shafts. The slide base has a hole in the center of the upper end of the cylinder and is provided with an M12 internal thread, which is convenient for connecting and fixing with the first joint and the second joint. Each wheel is installed on the four corners and the side of the slide base, and the small shaft parts are assembled with the corresponding slide base side hole at the center position of the wheel. The front part of the small shaft is provided with an M6 external thread and is connected and fixed with the base. The middle part of the small shaft is a smooth cylindrical surface to contact and support the wheel, which needs to be coated with lubricating paste to reduce the friction between the small shaft and the wheel. Further, each small shaft is allowed to be fixed by punching, which prevents the small shaft from loosening.

[0047] Referring to the accompanying drawings Figure 7 The typical slide rail of the present application is shown in the figure, which is formed by bending sheet metal parts, and the slide rail is horizontally extended. The side wall of the slide rail is 90 degrees to the ground, the groove height matches the wheel height, the groove width matches the slide width, and the slide rail can be coated with lubricating paste to reduce the friction between the wheel and the slide rail. The slide rail is fixed on the shelf with the support block whose size can be changed, and the height of the support block depends on the height of the force direction of the resistance umbrella lock cap. The slide rail and the support block are fixed on the shelf by screws, and the screw position does not affect the movement of the slide wheels. The screw position is symmetrical along the center line of the slide rail, which ensures that the direction of the slide rail and the support block does not deviate when the resistance umbrella lock is stressed.

[0048] Referring to the accompanying drawings Figures 8-9 The typical assembly through type stepper motor structure device and LabVIEW host computer software interface of the present application are shown in the figure. The hardware part of the present application mainly controls and manages the stepper motor by the control scheme of LabVIEW host computer + motion controller + driver module, and simultaneously uses the encoder of the stepper motor to feed back the position information to the driver module in real time. The software part mainly designs the motion of the stepper motor through the LabVIEW host computer to realize the control of the whole system. The stepper motor and its related hardware configuration are selected according to the size of the opening force of the resistance umbrella lock hook, and the matching motor load, rated speed, rated torque, motion mode and encoder resolution are selected. The present application selects 42HBS48AL4-TF0 stepper motor, ZD-2HD318 servo driver matched with the stepper motor, S-60-24 stepper motor motion control board and corresponding power switch. The stepper motor has an output current of 1.8A, an input voltage of DC 32V, and has the functions of short circuit protection, overload protection and overheat protection. It has high integration and high reliability when cooperating with the resistance umbrella lock hook reliability evaluation device, and can realize accurate measurement of the limit pulling force of the hook through simple coding.

[0049] Secondly, the use method of the device of the present application is introduced The use method of the above-mentioned electric drive resistance umbrella lock hook reliability evaluation device is characterized by comprising the following steps: 1) Resistance umbrella lock hook positioning preparation: adjust the size and position of the fixed mechanism positioning shaft, and fix it with a countersunk screw and a washer to ensure that the resistance umbrella lock is placed horizontally; 2) Device height and axis adjustment: adjust the fixing screws of the slide rail and support to ensure that the resistance umbrella lock hook, slide rail, and lead screw axis are in the same direction; adjust the height of the support under the slide rail and the support to ensure that the resistance umbrella lock hook, slide, joint, and lead screw are in the same height, and the force direction is in the same straight line.

[0050] 3) Motor parameter setting: correctly connect the stepper motor, controller, driver, power switch, and other components, and connect them through LabVIEW host computer software and write a stepper motor motion control program for motor test run; 4) Reliability evaluation: ① Locking reliability evaluation: set the resistance umbrella lock hook to "locked" state, turn on the stepper motor, drive the lead screw to slowly move towards the resistance umbrella lock hook, drive the slide rack to hit the lock ring and make the hook close, lock the resistance umbrella lock hook, turn off the motor, and record the force meter reading.

[0051] ② False lock reliability evaluation: set the resistance umbrella lock hook to "false lock" state, start the switch, make the stepper motor drive the force meter to move uniformly along the lead screw axis direction to the tension state, gradually increase the motor torque until the lock hook clamp is pulled open, turn off the motor, record the force meter reading change and remove the lock hook load.

[0052] ③ True lock reliability evaluation: set the resistance umbrella lock hook to "true lock" state, start the switch, make the stepper motor drive the force meter to move uniformly along the lead screw axis direction to the tension state, continue to increase the motor torque until the predetermined tension is reached, maintain for an appropriate time, the resistance umbrella lock hook should not be unlocked, turn off the motor, record the force meter reading change and remove the lock hook load.

[0053] 5) Resistance umbrella lock hook unloading: control the stepper motor to move the lead screw in reverse to a certain extent to remove the lock hook load, and sequentially remove the bent handle cylindrical pin, force meter, and resistance umbrella lock hook, turn off the motor power, and end the measurement.

Claims

1. A reliability evaluation device for a motor-assisted drag parachute hook, characterized in that: The device comprises: shelf; a stepping motor, disposed on one side of the frame; A mounting bracket is provided on the other side of the frame, and the mounting bracket is used for mounting a drag parachute lock hook; A lead screw connected to the stepping motor; a slide rail, arranged on the rack; a slide, connected to the slide rail, and capable of sliding along the slide rail; A locking ring connected to one end of the slide, the locking ring being used to push or pull open the drag parachute lock hook; A dynamometer, one end of which is connected to the other end of the slide, and the other end of which is connected to the lead screw.

2. The device according to claim 1, wherein The device further comprises: A motor support is arranged on one side of the frame, and the motor support is used to install the stepper motor.

3. The device according to claim 2, wherein The device further comprises: a first joint, through which one end of the dynamometer is connected to the other end of the carriage; A second joint, the other end of the dynamometer is connected to the lead screw through the second joint.

4. The device according to claim 3, characterized in that The device further comprises: A cylindrical pin with a bent handle can connect the first connector to one end of the dynamometer.

5. The device according to claim 1, wherein The mounting bracket comprises: Two positioning shafts are used to install the drag parachute lock hook.

6. A reliability evaluation method for a motor-assisted drag parachute hook, characterized in that: The method is applied to the device according to any one of claims 1 to 5, and the method includes: Step 1: Lock reliability evaluation; Step 2: Fake lock reliability evaluation; Step 3: Evaluation of the reliability of the genuine lock.

7. The method according to claim 6, wherein The step 1 specifically includes: Step 101: Position the drag parachute hook: Keep the drag parachute hook in the "open" position, adjust the size and position of the mounting bracket positioning shaft, and secure it with countersunk screws and washers to ensure the drag parachute lock is placed in a horizontal position. Step 102, device height and axis adjustment: adjust the height of the slide rail, mounting bracket, and motor bracket to ensure that the drag parachute hook, slide, first joint, second joint, and lead screw are at the same height so that the force directions are in the same straight line; Step 103: Turn on the stepper motor, drive the lead screw to move slowly toward the drag parachute hook, drive the lock ring at one end of the slide to hit the drag parachute hook, causing the hook to close and lock the drag parachute hook, turn off the motor, and record the dynamometer reading.

8. The method according to claim 6, wherein The step 2 specifically includes: Step 201, setting the "false lock" state: adjusting the device according to the method of claim 7 and setting the drag parachute lock hook to the "false lock" state; Step 202: Start the switch to make the stepper motor drive the dynamometer to move uniformly along the screw shaft to a tensioned state, gradually increase the motor torque until the lock hook chuck is pulled open, turn off the motor, record the change in the dynamometer reading and cancel the lock hook load.

9. The method according to claim 6, wherein The step 3 specifically includes: Step 301, setting the "true lock" state: adjusting the device according to the method of claim 7 and setting the drag parachute lock hook to the "true lock" state; Step 302: Start the switch to make the stepper motor drive the dynamometer to move uniformly along the direction of the screw shaft to a tensioned state. Continue to increase the motor torque until the predetermined tension is reached and maintain it for an appropriate time. The drag parachute hook should not be unlocked. Turn off the motor, record the change in the dynamometer reading and cancel the hook load.

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