80results about How to "Improve stability and reliability" patented technology

The invention relates to the technical field of wide-body vehicles, and provides a wide-body vehicle frame and a wide-body vehicle, the wide-body vehicle frame comprises a longitudinal beam, a lower ring beam, a lifting cross beam, a middle cross beam, a longitudinal pull rod cross beam and a tail cross beam, and the lower ring beam, the lifting cross beam, the middle cross beam, the longitudinal pull rod cross beam and the tail cross beam are sequentially arranged along the longitudinal beam at intervals; through the structural arrangement, the whole frame is connected into a firm and reliable integrated structure, and parts, mainly generating impact and stress, such as a front suspension system, a middle suspension system, a rear suspension system, a container lifting system and a longitudinal pull rod of the wide-body vehicle are reliably and stably mounted and supported; according to the wide-body vehicle frame, stress deformation, cracking and other unstable conditions of the frame are prevented, the overall stability and reliability are further improved by further improving the main stress structure, and then the service life of the wide-body vehicle frame is prolonged.

The invention relates to the technical field of junction boxes for power supply devices, and discloses a junction box for an electric power supply device capable of avoiding water accumulation of binding posts, the junction box comprises a main frame mechanism, the main frame mechanism comprises a box body, a dehumidification assembly is arranged at the top of the box body, and an adjusting assembly is arranged in the box body. The left side and the right side of the box body are each provided with an anti-disengaging assembly. According to the device, an anti-falling assembly is arranged, specifically, a first rotary knob is rotated clockwise to drive a first threaded rod to rotate, when the first threaded rod rotates, a movable support is driven to move upwards, and at the moment, a first inclined sliding groove moves through the movable support to make the tops of two supporting rods far away from each other; when the tops of the two supporting rods are far away from each other, the two clamping plates are driven to get close to each other, and the two clamping plates clamp and fix a cable while getting close to each other, so that the cable is prevented from being pulled by external force to be separated from the junction box, the stability and reliability of equipment are greatly improved, and a certain guarantee is provided for stable transmission of the equipment.

The invention belongs to the technical field of underwater acoustic test platforms, and particularly relates to a marine information experiment teaching platform based on a master-slave teleoperation system. The system comprises a master-end device and a slave-end device, a master-slave teleoperation system is carried in the master-end device, and a virtual model of the slave-end device is established in the master-slave teleoperation system; an experimenter operates the virtual model of the slave-end device through the master-slave teleoperation system, and the master-slave teleoperation system converts the action of the virtual model of the slave-end device into a control instruction and transmits the control instruction to the slave-end device; after receiving the control instruction, the slave end equipment adjusts the pose state of the transducer and the hydrophone; an experimenter sends an electric signal to the transducer through the master-slave teleoperation system, the transducer converts the electric signal into an underwater acoustic signal to be spread in the experimental pool, the hydrophone feeds back the underwater acoustic signal to the master-end equipment after receiving the underwater acoustic signal, and remote teleoperation processing of the experimenter on the experimental process is achieved.

The invention discloses a double-evaporator refrigerating system, refrigerating equipment and a control method thereof.According to the double-evaporator refrigerating system, an exhaust port of a double-cylinder compressor communicates with one port of a four-way valve, and a four-way port of the four-way valve communicates with a condenser assembly and a hot runner inlet of an enthalpy-increasing heat exchanger in sequence; a connecting pipeline communicated with a hot runner outlet of the enthalpy-increasing heat exchanger is divided into three branches. The first branch is sequentially communicated with a cold runner of the enthalpy-increasing heat exchanger and an enthalpy-increasing opening of the double-cylinder compressor through a throttling valve set. The second branch is sequentially communicated with a first evaporator assembly and a two-way port of a four-way valve through a first expansion valve, and a three-way port of the four-way valve is communicated with a first air suction port of the double-cylinder compressor; and the third branch is sequentially communicated with the second evaporator assembly and a second air suction port of the double-cylinder compressor through a second expansion valve. Temperature rise of the second temperature area caused by defrosting of the first temperature area can be avoided, frequent starting and stopping of the system are reduced, heat released in the compression process can be recycled, energy consumption is reduced, and the stability and reliability of the system are improved.

The utility model belongs to the field of linear motors, and particularly relates to a linear motor mover and a linear motor thereof, which comprise a mover shell, a motor coil assembly, a driver and an encoder reading head, one end of the motor coil assembly is fixedly connected to the rotor shell, and the other end protrudes out of the rotor shell; the rotor shell is provided with a cavity, the driver is arranged in the cavity, and the driver is electrically connected with the motor coil assembly; according to the linear motor mover, the driver, the encoder reading head and the motor coil assembly are integrated, and compared with a traditional linear motor mover, the number of wires is greatly reduced, the installation structure is simplified, the failure rate is reduced, and the reliability of the motor is improved. Wherein the driver is encapsulated in the cavity of the rotor shell through the pouring sealant, and meanwhile, a connecting line of the driver and the motor coil assembly is also fixed by the pouring sealant, so that the fixing stability of the driver and the connecting line of the driver and the motor coil assembly is ensured.

A control method for the analog input / output setting mode of a hydro-generator monitoring system includes a newly added program for identifying input / output pulses. The control logic is as follows: ① If an input pulse command of 1 is detected, the analog input / output setting value = analog input / output setting value + fixed step size; otherwise, the analog input / output setting value remains unchanged. ② If an input pulse command of 1 is detected, the analog input / output setting value = analog input / output setting value - fixed step size; otherwise, the analog input / output setting value remains unchanged. A new analog input / output setting value initialization program is also included, employing the following control logic: When other control modes are switched to analog input / output setting mode, the current input / output setting feedback value sent by the governor is assigned to the analog input / output setting value as the initial value. This invention can improve the guide vane opening and active power regulation speed, enhance equipment stability and reliability, reduce intermediate links and fault points, lower equipment failure rate, and ensure the safe, stable, and high-quality operation of the generator unit and the power grid.

The invention relates to the technical field of chemical raw material processing, in particular to chemical raw material mixing reaction equipment which comprises a reaction tank, a tank cover is arranged at the upper end of the reaction tank, two semicircular bottom plates distributed left and right are arranged at the lower end of the reaction tank, and a stirring unit is arranged at the lower end of the tank cover. The tank wall of the reaction tank is used for supporting and guiding the stirring assemblies in the mixing and stirring process, it is ensured that the stirring assemblies are evenly stressed, the relative stability between the stirring assemblies and the reaction tank is improved, meanwhile, the connecting pieces arranged between the upper and lower adjacent stirring assemblies are beneficial for improving the structural stability between the upper and lower adjacent stirring assemblies, and the stirring efficiency is improved. Highly stable connecting structures are kept between the stirring assemblies and the reaction tank / tank cover, between the reaction tank and the tank cover, between the upper and lower adjacent stirring assemblies and between the stirring assemblies and the driving assembly, so that the stability and reliability of the whole stirring unit during working are improved, and the mixing efficiency and effect of the stirring assemblies on chemical raw materials are effectively improved.

The invention discloses a narrow line width all-fiber laser, comprising a seed source, at least two-stage amplification modules, a multi-way circulator, an optical coupler and a pump drive module; the seed source and the gain optical fiber in each stage of the amplification module are sequentially connected to the port of the multi-way circulator to form a multi-stage double-pass amplification structure; the narrow line width high reflectivity grating in each stage of the amplification module is respectively connected to the pump drive module through an optical coupler, and the optical couplers corresponding to the adjacent amplification modules are connected to each other, so that the pulse light amplified by the previous stage of the amplification module is reversely injected into the next stage of the amplification module through the optical coupler, and a two-way three-pass amplification is formed in the next stage of the amplification module; the pulse light emitted by the seed source is amplified step by step through the amplification modules of each stage in turn, and is output from the last port of the multi-way circulator. The invention reduces the use of devices such as couplers, mode adapters, and online isolators, greatly simplifies the optical path structure and control system, and greatly improves the stability and reliability of the laser.

The invention discloses a compressor dynamics simulation optimization method combined with numerical optimization. The compressor dynamics simulation optimization method comprises the steps that 1, a compressor shafting moving part multi-body dynamics model is established; 2, setting key parameters influencing vibration in the compressor shafting moving part multi-body dynamic model in the step 1 as input and output parameterized variables; 3, optimizing the parameterized variables in the step 2 by adopting a genetic algorithm, storing and then outputting an m file; step 4, using Matlab software to open the m file stored in the step 3 and running the m file to obtain a simulink module of multi-body dynamics joint simulation, entering a simulink resource library, and establishing an iterative optimization process; and step 5, optimizing a final optimized simulation parameter by repeatedly carrying out the iterative optimization process in the step 4. According to different actual working conditions of the compressor, the dynamic response generated in the running process of the compressor can be reduced, and the running stability and reliability of the compressor are improved.

The invention relates to the field of semiconductor packaging, in particular to high-precision bonding equipment and a bonding method thereof.The high-precision bonding equipment comprises a left machine base, a right machine base and a handover module, the left machine base is provided with a wafer table, an ejector pin module, an overturning pickup module, a transfer module, a first camera and a transplanting suction nozzle module, and the first camera is arranged above the wafer table; the ejector pin module is arranged below the wafer table, the turnover pickup module adsorbs a chip on the wafer table, turns over by 180 degrees and transfers the chip to the transfer module, the transplanting suction nozzle module is arranged below the right side of the transfer module, a movable workbench, a third camera, a fourth camera and a near-infrared camera are arranged on the right machine base, the third camera is arranged at the left end of the movable workbench, and the fourth camera is arranged at the right end of the near-infrared camera. The fourth camera and the near-infrared camera are arranged above the movable workbench, the handover module comprises a driving module, a bonding head and a second camera, the bonding head is arranged on the driving module, the second camera is arranged on the left side of the right machine base, and the requirements for measurement and calibration, compensation and positioning precision of the hybrid bonding technology are met.

The invention discloses an automatic filling machine for a fuse pouring sealant. A rack of the automatic filling machine is provided with a transfer workbench and a constant-temperature stirring instrument, and the constant-temperature stirring instrument is provided with a material cup; the transfer workbench comprises a Y-axis driving linear module and a transfer movable frame, the transfer movable frame is provided with a fuse carrier plate, and the fuse carrier plate is provided with a plurality of positioning placement holes distributed in an array; an X-axis driving linear module is arranged at the upper end of a portal frame of the rack, a Z-axis driving linear module is arranged at the driving end of the X-axis driving linear module, a lifting movable frame is arranged at the driving end of the Z-axis driving linear module, and an automatic dispensing assembly is arranged on the lifting movable frame. The automatic glue dispensing assembly comprises a glue dispensing injector, the glue dispensing injector comprises an injection barrel, a piston push rod and a glue dispensing nozzle, the injection barrel is fixedly mounted on the lifting movable frame, and the piston push rod is driven by a drawing driving mechanism. Through the structural design, quartz sand mixed glue dispensing and potting operation can be automatically and efficiently carried out on the fuse, the structural design is novel, and the automation degree is high.

An excitation closer capable of improving closing reliability comprises a shell with a cavity, a first conductor and a second conductor, the first conductor and the second conductor are arranged in the shell in a penetrating mode in an insulated and opposite spaced mode, an excitation source and a piston are arranged in the cavity of the shell, the piston is of a shell-shaped structure with one end open and one end closed, and at least the peripheral face of the piston is made of conductive materials. The open end of the piston faces the driving force release end of the excitation source, and the closed end of the piston is arranged corresponding to the relatively spaced ends of the first conductor and the second conductor; the excitation source can act according to a received trigger signal to release driving force to drive the piston to move towards the first conductor and the second conductor, so that the piston is clamped between the ends, oppositely arranged at intervals, of the first conductor and the second conductor in a plastic deformation mode, and the first conductor and the second conductor are conducted. According to the invention, the reliability of conduction between the first conductor and the second conductor is improved through the plastically deformed piston.

The present invention relates to an automatic leveling level tripod used in construction engineering, comprising an annular frame, a leveling assembly fixedly arranged on the circumferential side of the annular frame, a tensioning assembly arranged in the middle of the annular frame, a leveling assembly arranged on the upper side of the tensioning assembly, a transmission assembly arranged on the side of the tensioning assembly, a locking assembly arranged at one end of the transmission assembly, and a first leg arranged on one side of the leveling assembly. Therefore, liquid will flow into the corresponding liquid containing tank according to the inclination of the annular frame, and finally the liquid levels in the three liquid containing tanks are all in the same horizontal plane. When the installation disk loses its constraint, the liquid in the three liquid containing tanks can automatically place the installation disk in a horizontal position through the leveling float. The whole process is simple to operate, and the leveling is accurate and fast, which shortens the time for leveling the installation level and improves work efficiency.

The utility model discloses a water chilling unit circulating system which comprises a heat preservation water tank, at least one refrigerating unit, a water using pipeline and a circulating pipeline. A water inlet pipeline and a water return pipeline are connected between the refrigerating unit and the heat preservation water tank, an inner circulation water pump is installed on the water return pipeline, the water using pipeline is communicated between the heat preservation water tank and a user side, and an outer circulation variable frequency water pump is installed on the water using pipeline. And the circulating pipeline is communicated between a user side and the heat preservation water tank. All the components are connected through pipelines and can be detachably and separately packaged, the problems of transportation space, outlet size limitation and the like are effectively solved, and when being transported to a user site, all the components only need to be connected through the pipelines and connected with a power source, and operation is convenient and fast.

The present application relates to the technical field of switching power supplies, and proposes a switching power supply circuit, a control method, and a power supply device; the switching power supply circuit includes a power output module, a first detection module, and a second detection module; when the switching power supply circuit is in a low power consumption mode, the first detection module is used to detect the output voltage of the voltage output terminal, so that when the output voltage is detected to be less than a first preset voltage, the first detection module sends a charging signal to the power output module, and sends a detection signal to the second detection module, and the charging signal is used to instruct the power output module to charge the voltage output terminal; when the detection signal is received, the second detection module is used to detect the output voltage of the voltage output terminal, so that when the output voltage is detected to be less than the second preset voltage, the switching power supply circuit exits the low power consumption mode. The present application can solve the problem of a large drop in the low power consumption mode exit of the switching power supply circuit, thereby improving the stability and reliability of the switching power supply circuit.

The application discloses a silicon dioxide deposition coating process of a vertical LPCVD device, and comprises the following steps: S1, checking whether the process pipe leaks; S2, blowing the process pipe with nitrogen gas under low pressure; S3, after the leakage rate detection is qualified, nitrogen gas is blown into the gas path pipeline, so that the pressure and the gas flow of the process pipe are stabilized under the pressure and the gas flow conditions set during film deposition; S4, under the set pressure condition, a reaction gas source is introduced, and a silicon dioxide film is deposited on the surface of a semiconductor substrate; and S5, after the silicon dioxide film deposition is completed, nitrogen gas is blown into the process pipe and the exhaust pipeline, nitrogen gas is introduced to increase the pressure to normal pressure, and the boat is discharged. The application has the advantages of simple operation, good stability, high film uniformity and the like, solves the problems of poor film thickness uniformity, high process granularity, poor repeat stability and extremely harsh requirements on process pressure of the existing LPCVD when depositing a SiO2 film, and realizes high-quality wafer coating.

The multi-angle coal mine drill rod grabbing manipulator comprises a supporting base and a clamping mechanism, a longitudinal hydraulic telescopic rod is arranged on the top face of the supporting base, a lifting table is arranged at the top end of the longitudinal hydraulic telescopic rod, and a first rotation adjusting rod is rotationally arranged in the lifting table; the first rotating adjusting rod is fixedly connected with a rotating sleeve, a transverse hydraulic telescopic rod is arranged in the rotating sleeve, the other end of the transverse hydraulic telescopic rod is connected with a telescopic plate, the telescopic plate is provided with a group of extension plates which are symmetrical up and down, and a second rotating adjusting rod is rotatably arranged between the extension plates; a bearing plate is fixedly arranged on the second rotating adjusting rod, and the clamping mechanism is located on the other side of the bearing plate. Compared with the prior art, the multi-angle grabbing device has the advantages that by arranging the first rotating adjusting rod, the second rotating adjusting rod, the longitudinal hydraulic telescopic rod and the transverse hydraulic telescopic rod, the multi-angle grabbing function is achieved, and the grabbing efficiency and flexibility are improved.

This invention relates to the field of template technology, specifically an adjustable template, comprising a template body, an adjustment mechanism, an installation mechanism, a support mechanism, a splicing mechanism, and a sealing mechanism. The adjustment mechanism facilitates adjusting the template to create drainage ditches suitable for different road surfaces, improving work efficiency and avoiding the waste of resources associated with custom templates. The installation mechanism allows for the creation of drainage ditches of different shapes through different combinations of bottom templates to meet various needs, improving the template's applicability. The support mechanism not only supports the interior of the telescopic box but also restores the slightly deformed telescopic box, improving the stability and service life of the device. The splicing mechanism improves the connection stability between templates, further enhancing the stability of the device. The sealing mechanism prevents cement from entering the template and damaging the internal structure during use, further improving the stability and service life of the device.

The utility model relates to a kind of wheel hub clamps for heat treatment process, including detachably installed in the clamping support piece of industrial robot end, the side of the clamping support piece is equipped with several connecting rod mechanisms and the driving member of slidable, the driving member can drive each the connecting rod mechanism to move in sliding process, the end of each the connecting rod mechanism is equipped with the clamping element of clamping wheel hub, the side of the clamping support piece is also equipped with the driving element of driving member sliding;The utility model utilizes driving element to drive driving member to push the angle of connecting rod mechanism to change relative to support base plate, so that the clamping element of the end of connecting rod mechanism can complete for the stable clamping and loosening of wheel hub, the demand of large-scale automated production is suitable.

According to the ingot pulling chamber lifting and translation mechanism for the electron beam cooling bed vacuum melting furnace, driven wheel sets and driving wheel sets matched with rail assemblies are arranged on the bottom faces of corners at the left end and the right end of an ingot pulling trolley respectively, and the two driving wheel sets at the right end of the ingot pulling trolley are connected into a whole through a translation driving device; a lifting driving device distributed on the periphery of the ingot pulling chamber is arranged on the upper end face of the ingot pulling trolley, the upper ends of a plurality of lifting parts of the lifting driving device are fixedly connected with a platform at the upper end of the ingot pulling chamber, and the ingot pulling chamber penetrating through the ingot pulling trolley is driven by the lifting driving device to ascend and descend. The two ends of one side of the ingot pulling trolley are each provided with a guide device matched with the corresponding side of the rail assembly and used for guiding the ingot pulling trolley. By optimizing the lifting and translation structure, the problem of poor stability and stability caused by unreasonable design of the lifting structure of the ingot pulling chamber is solved, the lifting stability and the stability in the translation process of the ingot pulling chamber are improved, the requirements for stability and reliability of lifting and translation of the ingot pulling chamber are met, and the ingot pulling chamber has high use value.

The invention relates to the technical field of locks, in particular to a double-movable shifting shaft assembly of a motor lock body. The double-active shifting shaft assembly of the motor lock body comprises a shifting shaft which is used for rotating under the action of external force and is provided with at least one first driving structure; the unlocking structure is arranged on the shifting shaft in a sleeving mode so as to be in running fit with the shifting shaft, the unlocking structure is provided with at least one matching part, and the shifting shaft rotates under the action of external force, so that the first driving structure is connected with the matching parts, and the unlocking structure is driven to rotate to conduct mechanical unlocking action; and the second driving structure is connected with the motor, and the second driving structure is used for driving the unlocking structure to perform motor unlocking action. During mechanical unlocking, a clutch mechanism does not need to be disengaged by a motor speed reducer, the unlocking structure can be driven to rotate by directly shifting the shifting shaft, the unlocking action is completed, the lock body structure is greatly simplified, the manufacturing cost is reduced, meanwhile, the stability and reliability of the lock are improved, and the failure rate is reduced.

The stable tobacco powder and rubber powder removing device for the ZJ17 cigarette making and plug assembling machine comprises a body arranged between a paper cutter and a converging drum wheel, the lower end face of the body is a step face with the left side higher than the right side, and an inverted-L-shaped step opening in the lower end face of the body and a tangent line at the corresponding position of the converging drum wheel form a triangular buffer area used for preventing equipment from being damaged after tobacco clamping. A connecting hole located below the negative pressure connecting pipe is formed in the outer side wall of the body in a penetrating mode, a tongue plate on a ZJ17 cigarette making and plug assembling machine wallboard is inserted into a square hole in the side wall of the body, and a long shaft of the ZJ17 cigarette making and plug assembling machine is sleeved and locked with the connecting hole. By optimizing the tobacco powder and rubber powder removing structure, reliable positioning of the body in the axial direction and the circumferential direction is achieved, vibration or movement of the body in the axial direction and the circumferential direction in the using process is avoided, the defect that a traditional installation structure is poor in stability and prone to failures is overcome, popularization and application of the tobacco powder and rubber powder removing structure on the ZJ118 type are achieved, and the tobacco powder and rubber powder removing structure is suitable for the ZJ118 type. The failure rate in the using process is reduced, and stability and reliability are high.

The utility model discloses an aperture module with an improved structure, which comprises a lower base, an upper cover plate, a stepping motor, a blade group and a movable ring, the lower base is provided with a base accommodating cavity, a base light through hole and an arc-shaped groove, the upper cover plate is buckled at the upper end part of the lower base, and the movable ring is rotationally arranged in the base accommodating cavity; an outer gear part is arranged on the edge of the outer end of the movable ring, the stepping motor is fixedly installed on the lower base, and a driving gear of a power output shaft of the stepping motor is meshed with the outer gear part. Each aperture blade in the blade group is driven by the movable ring; a vertical limiting flange is arranged on the edge of the outer end of the movable ring, a plurality of limiting protruding parts are arranged on the inner wall of the base containing cavity, and the movable ring is vertically limited between the limiting protruding parts and the bottom face of the base containing cavity. The movable ring is provided with an induction piece inserted into the arc-shaped groove, and an original point sensor is arranged in the arc-shaped groove. By means of the structural design, the LED lamp has the advantages of being novel in structural design, good in stability and reliability and accurate in light flux control.

The invention relates to an ultra-large mode field spoke core fiber laser suitable for laser micro propulsion, which adopts a main oscillation power amplification structure and comprises a seed source, a first amplification stage, a second amplification stage and a main amplification stage, the seed source is a directly modulated semiconductor laser, outputs pulse laser with tunable pulse width and repetition frequency, and the laser of the seed source enters the main amplification light path in a free space coupling mode after being subjected to primary and secondary pre-amplification. The main amplification stage amplifies the average power of laser to hectowatt magnitude by adopting an ultra-large mode field spoke core optical fiber with a bilateral pumping design, and dynamic adjustment of specific impulse and thrust of the micro-thruster is realized by changing the power, pulse width and frequency of the laser. The laser micro-thruster is clear in design principle, the achievable effect of the laser micro-thruster breaks through the limitation of the specific impulse and thrust dynamic range of a common laser micro-thruster, and the multi-task scene application capacity of the laser micro-thruster is remarkably improved.

This utility model discloses a light adjustment device and lighting equipment, relating to the field of lighting equipment technology. The light adjustment device includes a pressure sensor, a roller bracket, and an adjustment wheel. The pressure sensor is installed inside the main body of the lighting equipment. The roller bracket is fixedly installed on the main body of the lighting equipment. The adjustment wheel is hinged to the roller bracket via a rotating shaft, and an adjustment section is provided on the side of the adjustment wheel near the pressure sensor. The adjustment wheel rotates relative to the roller bracket, allowing different parts of the adjustment section to press against the sensing surface of the pressure sensor. The roller bracket has a positioning part corresponding to the adjustment wheel, which limits the relative position of the adjustment wheel and the roller bracket. The light adjustment device provided by this utility model utilizes the rotation of the adjustment wheel to provide different pressures to the pressure sensor, thereby adjusting the lighting mode of the lighting equipment. This makes operation more convenient and accurate, improving the user experience of using the lighting equipment.

This utility model relates to the field of bridge safety maintenance technology, and more specifically, to an integrated bridge monitoring auxiliary device, comprising: a fixed plate and a mounting box; the mounting box is fixed to the upper surface of the fixed plate; a sliding groove is formed on the top surface of the mounting box; one end of the solar panel is hinged to the mounting box; one end of the support arm is hinged to the solar panel, and the other end of the support arm is hinged to the fixed block; a T-shaped block is slidably disposed in the sliding groove and is connected to the fixed block; a micro wind turbine is fixed to one side of the mounting box; the acquisition module, the data transmission module, and the battery are installed inside the mounting box; the acquisition module is connected to a sensor; this utility model, through improvements to the integrated bridge monitoring auxiliary device, has the advantages of improved power supply stability and reliability, and applicability to different regions, thus effectively solving the problems and shortcomings of existing technologies and equipment.

The invention discloses an extrusion type fastening self-locking bush, and relates to the field of aircraft assembly, in particular to an extrusion type fastening self-locking bush which comprises a first bush body and a second bush body. The first bushing comprises a first mounting disc, a mounting column and a first matching table; the installation column is arranged on one side of the first installation disc and provided with an assembly hole. The first matching table surrounds the mounting column; a first ratchet ring is arranged on the first matching table; the second bushing comprises a second mounting disc and a plurality of second matching tables; a mounting hole is formed in the second mounting disc; the second matching table is arranged around the mounting hole; an expansion groove is formed between every two adjacent second matching tables; and a second ratchet ring is arranged on the second matching table around the mounting hole. The problems that when a common bush is installed, time and labor are wasted, safety risks exist, efficiency is low in the aircraft assembling and maintaining process, operation efficiency and precision are affected, the bush is prone to falling off and shaking, when the bush is deformed, a shaft in the bush is damaged, and then the safety of aircraft operation is affected are solved.