84results about How to "Reduce resonance" patented technology

The invention relates to the technical field of welding industrial robots, and discloses a damping device for an arm of a welding industrial robot, which comprises a base, a mechanical base, a mechanical arm and an end effector, and a second spring in a damping cylinder at the top end of the damping device is matched with a damping column I of the mechanical base; arm weight, dynamic load and ground vibration borne by the base are effectively dealt with, it is avoided that vibration is transmitted to the mechanical arm to affect welding precision, a second spring releases energy through deformation conversion during vibration, the mechanical base and the arm are subjected to shock absorption, and when shock absorption is not needed, the mechanical base and the arm can be tightly connected through a top bolt and other components and absorb energy through friction rubber. The fixing rod is taken down when the connecting position of the end effector does not need damping, the first spring conducts damping on the connecting position of the mechanical arm and the rotating connecting block, the situation that the welding position is not accurate due to track deviation of the mechanical arm is avoided, the fixing rod is used for limiting and fixing when damping is not needed, and a friction plate on a connecting column can absorb vibration impact; efficient and accurate welding operation and stable operation of equipment are guaranteed.

The invention discloses a flexible support for mountainous region photovoltaic construction, and relates to the technical field of photovoltaic construction, the flexible support comprises a plurality of groups of fixing piles poured on a mountainous region, steel nooses are arranged among the plurality of groups of fixing piles, photovoltaic fixing plates are laid on the steel nooses, and bearing cables are further arranged among the plurality of groups of fixing piles. A square pyramid is arranged on the lower surface of the photovoltaic fixing plate, the bottom end of the square pyramid is arranged on the bearing cable, a windproof cable is longitudinally arranged below the bearing cable and penetrates through the square pyramid, windproof piles poured on a mountain land are arranged at the two ends of the windproof cable, and damping mechanisms are arranged in the windproof piles. The bracket is provided with the windproof cable and the damping mechanism, and the energy of up-down vibration of the windproof cable is absorbed through mechanical movement in strong wind weather, so that the amplitude of up-down vibration of the steel noose and the bearing cable can be reduced, the stability of the steel noose and the bearing cable is improved, and the wind-resistant effect is good.

The utility model discloses a side-mounted garbage collection and transportation manipulator which comprises a grabbing mechanism, a lifting mechanism, a transverse position adjusting mechanism, a telescopic mechanism, a visual auxiliary operation mechanism and a control mechanism. The grabbing mechanism is provided with a single-finger clamping jaw and a double-finger clamping jaw which can be adjusted independently or simultaneously, and the single-finger clamping jaw is located in a gap in the middle of the double-finger clamping jaw. A sensor is arranged on the tail end clamping jaw; the lifting mechanism drives the grabbing mechanism and the transverse position adjusting mechanism to ascend and descend, and overturning and dumping of the dustbin are achieved. The transverse position adjusting mechanism is used for adjusting the position of the grabbing mechanism in the transverse direction; the telescopic mechanism is used for driving the supporting and lifting mechanism to stretch forwards or retract backwards, and the visual auxiliary operating mechanism obtains an image at the grabbing mechanism and conveys the image to the control mechanism; and the control mechanism is provided with a controller for controlling other parts to work. The grabbing mechanism is controlled to be opened and closed more accurately, and the garbage can is prevented from being shrunken by clamping or falling off in the grabbing process; and the adjustment in the lifting or horizontal direction is more accurate.

The invention provides an ultra-high-speed electric connector which comprises an insulating body, the insulating body is provided with a lengthwise slot, a plurality of terminal slots are formed in lengthwise side walls on the two sides of the slot respectively, and a fool-proof part is arranged in the slot and used for dividing the insulating body into a power supply and low-speed signal area and a high-speed signal area which are located on the two sides of the fool-proof part; the plurality of terminals comprise differential signal terminals distributed in the high-speed signal area and other terminals distributed in the high-speed signal area and the power supply and low-speed signal area, every two differential signal terminals are adjacent, and two sides of every two adjacent differential signal terminals are respectively provided with a grounding terminal; every two adjacent differential signal terminals and two grounding terminals located on the two sides of the two differential signal terminals form a terminal module, and the two differential signal terminals and the two grounding terminals of each terminal module and an insulating block inserted into the insulating body are formed in an embedded mode. The ultra-high-speed electric connector can enable signal transmission to be better and more stable.

The utility model discloses a super-linear bidirectional sound output loudspeaker, comprising a first vibration system formed by bonding a first frame body, a first voice coil, a first voice diaphragm and a first FPC soft board, a second vibration system formed by bonding a second frame body, a second voice coil, a second voice diaphragm and a second FPC soft board, and the two vibration systems are bonded and face opposite directions; the first FPC soft board and the second FPC soft board are provided with bonding pad points, the bonding pad points are located above the corresponding voice coil lead wires, the first central magnet, the second central magnet, the first washer and the second washer are connected to the two surfaces of the U iron to form an assembly, and the U iron is connected with the side magnet. The side magnets are connected to the inner sides of the two frame bodies and located on the two sides of the assembly to form a center magnetic circuit system. The beneficial effects of the utility model are that the FPC soft board is directly welded with the voice coil lead, so that the voice coil lead is prevented from being bent, and the power resistance of the loudspeaker is improved.

The invention provides a circuit breaker fault early warning method and system based on digital twinning, and relates to the technical field of power equipment detection.The circuit breaker fault early warning method comprises the steps that electrical parameters, mechanical data and real-time environment temperature data of a circuit breaker are collected, and a circuit breaker electrical equivalent circuit model and a mechanical model after temperature correction are established; the accuracy of the circuit model is verified through loss power, and the accuracy of the mechanical model is verified through inherent frequency. The simulation calculation results of the circuit model and the mechanical model are combined, three state variables of current, voltage and frequency are detected and compared with a dynamic threshold value to generate a fault judgment index, and the state variables having faults are judged by synthesizing the value of the fault judgment index. The method effectively improves the monitoring precision and response speed of the circuit breaker, and reduces the fault risk.

The invention belongs to the field of ship damping equipment, and discloses a ship engine damping system which comprises an electric balancer, a damping device and a damping device. A mechanical system is arranged in the shell and comprises two balance blocks which are the same in rotating speed and opposite in rotating direction, and vertical torque generated in the rotating process of the balance blocks is transmitted to the shell, so that ship body resonance is compensated. And the control system is used for monitoring the operation of the host and executing motor control by receiving user instructions and parameters so as to control the speed and the phase of a balance block in the mechanical system. The two balance blocks are arranged in the ship body, connected with the main engine and rotate in the opposite directions, ship body resonance is counteracted through vertical torque generated by the balance blocks, vibration generated by the ship body is reduced, the stability of the ship body is improved, the possibility that the ship body is damaged and equipment on the ship is damaged is reduced, and therefore the service life of the ship body is prolonged.

The application discloses a kind of carbon ceramic brake pad for grinding carbon ceramic brake disc, belong to brake pad technical field, solve the poor heat dissipation performance of existing ceramic brake pad, insufficient connection strength, leading to the problem of poor friction performance, it includes carbon ceramic lining plate and the carbon ceramic friction surface installed on carbon ceramic lining plate, multiple mortise grooves are set on the upper surface of carbon ceramic lining plate, multiple tenon heads matched with mortise groove are set on the lower surface of carbon ceramic friction surface, tenon head is embedded into mortise groove and forms mortise and tenon structure, connects carbon ceramic lining plate and carbon ceramic friction surface, ear plate is set on the circumference of carbon ceramic lining plate, and mounting hole is formed in ear plate;In the application, the friction coefficient is adjusted by designing ceramic phase composition and density of carbon ceramic friction surface and carbon ceramic lining plate, and carbon ceramic lining plate and carbon ceramic friction surface are connected by RMI process and mortise and tenon structure to improve the mechanical properties of connecting place, ensure braking safety, reduce thermal stress generated in braking process, so as to improve the friction performance, effectively guarantee braking effect, and prolong service life.

An ultra-wideband end-fire antenna with a common aperture embedded in a metal carrier includes a metal cavity with a coaxial cable compartment on one side. A radiator module is connected to the bottom of the metal cavity via a radiator fixing slot. The radiator module includes a common aperture antenna substrate. A low-frequency radiator is printed on the side of the common aperture antenna substrate closer to the coaxial cable compartment, and a high-frequency radiator is printed on the side farther from the coaxial cable compartment. This invention utilizes a dual-band antenna in a common aperture design to enhance the channel capacity and anti-fading capability of the communication system. At the same time, by achieving the antenna's carrier conformal characteristics, high isolation, and miniaturization, it enriches the antenna's application scenarios and improves the overall performance of the communication system.

The present invention discloses a base station, an antenna and a transition structure of a microstrip line and a coaxial cable thereof. The transition structure comprises a microstrip line, a coaxial cable and a fixing seat. The core of the coaxial cable can be electrically connected to the microstrip line. The fixing seat is provided with a first through hole for the coaxial cable to pass through and a first connecting portion for electrically connecting to a reflector, and the fixing seat can be coupled and connected with the outer conductor of the coaxial cable. The transition structure of the microstrip line and the coaxial cable is simple in structure and easy to assemble; thus, the antenna using the transition structure of the microstrip line and the coaxial cable is simple in structure and easy to assemble; thus, the base station using the antenna is easy to assemble, and the assembly efficiency is improved.

The invention provides a power assembly and a vehicle with the power assembly, the power assembly comprises an integrated shell and a stator rotating mechanism, the integrated shell is internally provided with a containing cavity, the containing cavity is internally provided with a motor shaft, a first motor unit and a second motor unit, the first motor unit and the second motor unit are both arranged on the motor shaft, and the stator rotating mechanism is arranged in the containing cavity. The first motor unit and the second motor unit are arranged in the axial direction of the motor shaft in a spaced mode. The stator rotating mechanism is connected with a stator of the second motor unit, and the stator rotating mechanism is rotatably arranged relative to the side wall of the containing cavity so as to adjust the stator angle of the second motor unit. By designing the stator rotating mechanism, the circumferential angle of the stator of the second motor unit is adjusted, and noise and resonance of the motor are reduced.

This utility model discloses a corrugated pipe with a noise reduction structure, relating to the field of corrugated pipe technology. It includes a corrugated pipe and a flow guide. The flow guide is disposed inside one end of the corrugated pipe. The outer wall of the flow guide gradually widens from one end to its opposite end, with the narrow end facing the end of the corrugated pipe without the flow guide. The flow guide is coaxially arranged with the corrugated pipe, and a gap is left between them for airflow. This utility model, by providing a flow guide inside the output end of the corrugated pipe, allows turbulent airflow within the corrugated pipe to impact the flow guide when it reaches the output end. This compresses the airflow, making its velocity uniform, and the airflow then exits through the gap between the flow guide and the inner wall of the corrugated pipe, reducing resonance noise. Furthermore, the gradual widening of the outer wall of the flow guide from one end to its opposite end provides flexible guidance, further improving the uniformity of airflow and thus reducing resonance noise.

This utility model discloses an air conditioner with a noise reduction device, comprising an outdoor unit; a bracket for fixing a main frame to a wall or base, and a secondary frame for supporting the outdoor unit; and a noise reduction mechanism including a shock absorber disposed between the secondary frame and the outdoor unit, a steel cable connecting the two secondary frames, and a counterweight suspended from the steel cable. This utility model provides an air conditioner with a noise reduction device. When the outdoor unit is operating, the vibration it generates is reduced by the shock absorber, thereby reducing the vibration of the secondary frame. When the secondary frame vibrates, the vibration is transmitted to the counterweight through the steel cable, causing the counterweight to sway, thus counteracting the vibration and further reducing it, thereby reducing resonance and lessening noise caused by vibration.

The application discloses a keyboard key and a computer keyboard. The keyboard key comprises a key cap body, the key cap body has a cavity with an opening facing downward, and an upper surface of the key cap body forms a knocking surface; a hard structure comprises a base and a sleeve downward protruding from the base, the sleeve has a sleeve hole with an opening facing downward; a soft structure comprises a base table and a connecting column downward protruding from the base table, an upper surface of the base table is connected to a bottom of the cavity, the base is fixedly connected with the base table, a main body part of the connecting column is embedded in the sleeve hole, and a cross connecting hole is arranged in the connecting column, and the cross connecting hole is connected with a cross connecting column of a keyboard shaft body. The keyboard key and the computer keyboard have the advantages that when each key is pressed, the hand feeling tends to be consistent, the knocking bottom sound, the resonance sound and the key cap cavity sound generated when rebounding are consistent.

The utility model relates to the technical field of water pump installation, and discloses a water pump installation structure and a water pump thereof. A support plate; the adjusting assembly comprises a vertical shaft, a limiting ring, thrust protrusions and limiting grooves, the vertical shaft is fixedly connected with the supporting plate and rotationally connected with the bottom plate, the limiting grooves are formed in the top of the bottom plate, the thrust protrusions are fixedly arranged at the bottom of the limiting ring and can be clamped into the limiting grooves to lock the position of the vertical shaft, and the limiting ring is elastically connected with the vertical shaft. The limiting ring is pushed upwards, the limiting ring slides along the vertical shaft, the protruding block on the inner ring of the vertical shaft slides along the vertical groove, then the thrust protrusion is separated from the limiting groove, the position of the supporting plate can be adjusted by rotating the supporting plate, the position of the water pump water opening fixedly formed in the top of the supporting plate can be adjusted, then butt joint of the water pump water opening and a pipeline is facilitated, adjustability is high, and practicability is high. And the installation adaptation degree is higher.

The invention discloses a diesel DCT power assembly resonance optimization method and system, relates to the technical field of power assembly simulation testing, and aims to solve the problem that the engine speed lasts for a long time in a resonance speed interval of a dual-mass flywheel due to insufficient combustion in a cylinder and low output power of a diesel engine under a low-temperature cold start working condition. The starting strategy of the diesel engine is optimized, so that the power source of the diesel DCT power assembly overcomes the resistance source of the diesel DCT power assembly, and then the starting rotating speed of the diesel engine can quickly pass through the resonance interval of the dual-mass flywheel; by the adoption of the resonance optimization method, resonance generated by a power system with the diesel engine and the DCT gearbox matched with each other during low-temperature cold start can be effectively reduced, and the engine rotating speed can be prevented from being kept within the resonance rotating speed interval of the dual-mass flywheel all the time when the engine is started. And the service life of main parts in the power assembly can be prolonged.

This invention discloses a miniaturized four-channel combining module based on the TE20 mode, belonging to the field of millimeter-wave power combining technology. It includes a layered upper cavity, a mezzanine, a lower cavity, and an RF unit. The RF unit comprises a TE10-TE20 waveguide distributor, two amplification branches, and a TE20-TE10 waveguide combiner. Each amplification branch includes a TE20 mode filter, a waveguide-microstrip transition, a pair of amplifier chips, and a microstrip-waveguide transition connected sequentially. The TE10-TE20 waveguide distributor and the TE20 mode filter are disposed in the upper and lower cavities. The waveguide-microstrip transition, the pair of amplifier chips, and the microstrip-waveguide transition are disposed on opposite sides of the mezzanine. The TE20-TE10 waveguide combiner is disposed in the upper cavity, the mezzanine, and the lower cavity. This invention utilizes a high-isolation waveguide distributor / combiner to improve branch isolation, shorten the combining path, and has a compact overall structure with advantages such as wide bandwidth, high isolation, high combining efficiency, and miniaturization.

This utility model discloses a horizontal line array speaker, relating to the field of speaker technology. It includes a cabinet, inside which a first speaker and a second speaker are installed. The first speaker propagates sound outwards along a first outlet of the cabinet, and the second speaker propagates sound outwards along a second outlet. The sound waves emitted by the first speaker can cancel out the low-frequency sound waves from the side of the second speaker facing away from the second outlet, causing the low-frequency sound waves to primarily propagate towards the second outlet. This increases the concentration of sound wave propagation, effectively reducing the impact of ambient noise and thus increasing the sound wave energy on the side closer to the audience. The cabinet is equipped with a waveguide located on the side facing away from the first outlet. The waveguide can convert spherical waves into plane waves, which helps improve the directivity of the sound waves and saves space, allowing for a smaller cabinet size. The second outlet is equipped with a phase plug, which reduces the secondary reflection path of the sound waves, reduces bass looseness and resonance problems, makes the low frequencies tighter and more powerful, and enhances the sense of rhythm.

The application relates to the technical field of motor equipment, and discloses a high-overload three-phase brushless motor, which comprises a shell, a plurality of insertion grooves are formed in the side wall of the shell, a bolt is slidably connected in the insertion grooves, and a rotating shaft is rotatably connected in the shell. When the spring elasticity is used to reduce the gap and the running deviation of the rotating shaft, the situation that the rotating shaft and the magnetic steel are damaged or rubbed during the rotation process under the high-overload condition due to the excessively large gap formed between the rotating shaft and the surrounding structure under the high-overload condition can be reduced, the operation accuracy and stability of the equipment during the high-overload process are ensured, and the reliability of the equipment during the operation is improved.

An external fan air supply device for a range hood and a ventilation pipeline is composed of an air supply device, a fan, a pipeline and a sealing connecting piece. The air supply device is an innovative core component and can be made of metal or non-metal materials through machining or injection molding and other processes and equipment. The air supply device is simultaneously connected with the fan arranged outside the pipeline and the smoke exhaust pipeline or the ventilation pipeline of the range hood, the flow guide structure is guided through the air supply device during working, airflow needing to be exhausted or conveyed is sucked and guided out, and therefore the oil smoke exhaust or ventilation effect is achieved. Therefore, the problems that the fan is arranged in the range hood or the ventilating duct, oil dirt and dust are prone to being accumulated, potential safety hazards of fire safety electricity utilization are caused, and cleaning and maintenance are inconvenient are solved, and meanwhile the effective space and gas passing ability in the range hood and the ventilating duct are improved. The safety, the practicability and the application scene universality of the method can generate remarkable economic benefits.

The invention provides a wheel step type rotary drilling rig intelligent gait planning and cooperative control method and system, and the method comprises the steps: collecting the torque value of a drill rod, the rotation direction of the drill rod, the contact force deflection angle of each supporting leg steel claw, the leg vibration frequency, and the feeding speed and rotation speed of drilling operation; fourier transform is carried out on the torque value of the drill rod to obtain the torque fluctuation frequency of the drill rod; evaluating a phase angle between the rotation direction of the drill rod and the circumferential layout of the supporting legs, screening out leg positions with the phase angle exceeding a preset safety angle threshold value and vibration exceeding a limit, and adjusting the unfolding radius; identifying load concentration orientation distribution of each leg by taking the expansion radius adjustment amount of the supporting leg as an independent variable and the steel claw contact force deflection angle change rate as a dependent variable; gait scheduling arrangement, feeding speed and rotation speed are fused and optimized, a switching time window is divided according to the leg lifting and falling action period of each supporting leg, and feeding propulsion and rotation start-stop takt is matched in an alternating gap of adjacent supporting legs to form a cooperative control signal.

The utility model discloses an unfolding type support tree shaking vehicle, including car body, car swivel body, car turntable, support joint combination mechanism and oscillation pincers, support joint combination mechanism includes clamping bottom plate, joint drive mechanism, left support joint and right support joint, and left support joint and right support joint all include clamping support block, oblique joint, left auxiliary rod and right auxiliary rod, is equipped with left auxiliary rod drive mechanism for pushing left auxiliary rod away from self and right auxiliary rod drive mechanism for pushing right auxiliary rod away from self on oblique joint, is provided with support drive mechanism in oblique joint, left auxiliary rod and right auxiliary rod inside, and support drive mechanism is used for driving the close contact of directional support plate with ground, the utility model discloses through support joint combination mechanism clamping tree trunk and support on the ground, when the oscillation pincers shake tree trunk and pick fruit, have the effect of protecting tree root to stabilize the lower part of tree trunk, simultaneously, the oscillation pincers are suspended in car swivel body, and the resonance of car body is reduced, can effectively promote fruit to fall off and reduce tree trunk damage.

The utility model discloses a mounting device for a car roof wheel of an elevator, which comprises a base, a plurality of mounting plates and a plurality of mounting plates, the bottom of the base extends into an upper beam of the elevator, the longitudinal section of the base is approximately U-shaped, the middle of the base is provided with a concave part extending downwards along the height direction, and a reinforcing component is arranged in the base and below the concave part so as to improve the rigidity of the base; the two connecting parts are detachably installed at the two ends, extending in the transverse direction, of the base correspondingly and suitable for installing the two car roof wheels on the base correspondingly. The rigidity of the connecting part is smaller than that of the base so that resonance of the connecting part and the base in the elevator running process can be weakened.

The application discloses a sound-absorbing and sound-insulating material and relates to the technical field of sound-absorbing and sound-insulating materials. The sound-absorbing and sound-insulating material is characterized in that PET hollow fibers are used as a framework, PP melt-blown fibers are used as filling materials to form a high-frequency sound-absorbing layer, the PET hollow fibers are used as a framework structure to ensure that the sound-absorbing and sound-insulating material has sufficient strength and stability, and melt-blown cloth fluff is added to the high-frequency sound-absorbing layer to prepare a low-frequency sound-absorbing layer. The PP melt-blown fibers are directly deposited and embedded into the PET fiber framework to form a material with small pores but many pores. The high-frequency sound-absorbing layer and the low-frequency sound-absorbing layer are layered and stacked, and non-woven fabric is arranged on the outer surface to form a novel sound-absorbing and sound-insulating material. The sound-absorbing and sound-insulating material not only has better sound-absorbing performance, but also has improved low-frequency sound-absorbing performance.

The invention discloses an underground coal transport vehicle, and belongs to the technical field of coal transport devices, the underground coal transport vehicle comprises a vehicle frame main body and a vehicle head suspension plate, the outer side of the top end of the vehicle head suspension plate is provided with a guardrail assembly, and the top end of the vehicle head suspension plate is provided with a cockpit side protection assembly; a storage assembly and an anti-seismic supporting assembly are arranged at the position, located in the cab side protection assembly, of the top of the vehicle head suspension plate, and a throwing hole is formed in the top of the vehicle head suspension plate. Through cooperative arrangement of the trigger trapezoidal columns and the limiting clamping tongues, when the cockpit top plate is impacted by collapse objects, serious deformation of the cockpit top plate can be prevented through the anti-seismic buffer springs, meanwhile, resonance caused by impact of the collapse objects is weakened, and when the collapse objects cause deformation of the cockpit top plate, the limiting clamping tongues can be pressed downwards through the trigger trapezoidal columns, so that the collapse objects are prevented from collapsing. The seat bearing platform is put into the escape bin formed in the platform enclosure, and a driver can obtain escape materials in the material storage cabinet by opening the cabinet body closing plate and escape in time by opening the escape protection plate.

The utility model discloses a receiver module of a hearing aid and the hearing aid. The receiver module can be connected with a main body of the hearing aid, and comprises an outer shell, a limiting inner shell, a sound production assembly, a quick-release fixing piece, a hose and an earplug, the sounding assembly and the limiting inner shell are arranged in the outer shell; the limiting inner shell half wraps the sound production assembly and is bonded with the sound production assembly. One end of the quick-release fixing piece is detachably clamped on the outer shell and is aligned with the sounding port of the sounding assembly, and the other end is detachably inserted with the hose; the end, away from the quick-release fixing piece, of the hose is detachably inserted into the earplug. The receiver module can provide a large degree of freedom for a user to replace or clean the hose and the quick-release fixing piece, and is beneficial to improving the user experience. And moreover, the hose can be detached from the quick-release fixing piece and can be freely cut to adapt to auricles of different sizes and shapes, so that the wearing comfort and stability of the hearing aid are improved, and the individual requirements of users are met.

The application provides a wind turbine jump speed control method, device, equipment and storage medium, and belongs to the field of wind power generation. The method is as follows: a plurality of first generator speed values and first generator torque values are obtained, and a plurality of first generator power values are calculated according to the obtained data; the plurality of first generator speed values, the first generator torque values and the first generator power values are respectively input into a filter to obtain a plurality of second generator speed values, second generator torque values and second generator power values; whether the wind turbine rotor rotation frequency range coincides with the first-order natural frequency of the flexible tower is judged according to the plurality of second generator speed values, the second generator torque values and the second generator power values; if yes, a target torque value, a minimum torque limit value and a maximum torque limit value are determined according to the first-order natural frequency of the flexible tower; and the generator speed is adjusted according to the generator speed isolation interval. The application can avoid resonance and improve the service life of the wind turbine.

The invention relates to the technical field of air storage air compressors, and discloses a high-stability air compressor for energy storage, which comprises a damping base and a damping assembly, a compressor is arranged on the inner wall of the damping base, and an air inlet pipe is fixedly mounted on the right side of the compressor; the damping assembly comprises a moving frame, an adjusting hole, a moving hole, an elastic telescopic rod, a limiting groove, an elastic telescopic plate, an elastic telescopic roller and a damping frame, the moving frame is fixedly installed at the bottom of the compressor, the adjusting hole is formed in the front side of the damping base, and the moving hole is formed in the front side of the moving frame. When the elastic telescopic plate is pressed to move downwards, the elastic telescopic plate is separated from the limiting groove and the limiting to the elastic telescopic rod is relieved, the triggering mode of pressing unlocking can prevent limiting failure caused by accidental touch in the daily operation process, and the design of automatic limiting after resetting can ensure that the elastic telescopic rod is stably locked; therefore, excessive vibration leakage caused by limiting falling during operation of the compressor is avoided.

The utility model discloses a loudspeaker test fixture with a sound short circuit hole, which comprises an imitated sound ear and an elastic pad, the upper wall of the imitated sound ear is concavely provided with a rectangular positioning groove, the imitated sound ear is provided with a test channel, the positioning groove extends towards the test channel to form a side wing, the middle part of the side wing is provided with a first sound test hole, and the middle part of the first sound test hole is provided with a second sound test hole. The side wing is provided with a second sound measuring hole penetrating through the wall face of the side wing, the first sound measuring hole and the second sound measuring hole are both located above the testing channel, the elastic cushion is matched with the positioning groove in shape, a first sound guiding hole is formed in the middle of the elastic cushion, a second sound guiding hole is formed in the wall face of the elastic cushion, the first sound guiding hole is in a circular shape, and the second sound guiding hole is in a circular shape. The second sound guide hole is in a sheet shape. The first sound hole and the second sound hole (namely the short-circuit hole) of the loudspeaker respectively extend into the first sound guide hole and the second sound guide hole, so that two sound channels can be tested by the imitated sound ear, the loudspeaker with the sound short-circuit hole can be tested by adding the jig to the existing imitated sound ear, and the structure is simple and stable.

The application discloses a high-precision six-axis motion platform, which comprises a steel frame assembly, a stone material assembly, an XY-axis assembly, an AC-axis rotary table, a Z-axis assembly and a B-axis rotary table, the stone material assembly is installed on the steel frame assembly, the XY-axis assembly is installed on a base of the stone material assembly, the AC-axis rotary table is horizontally installed on a Y-axis load plate of the XY-axis assembly, the Z-axis assembly is vertically installed on a cross beam of the stone material assembly, and the B-axis rotary table is installed on a Z-axis load plate of the Z-axis assembly. The six-degree-of-freedom independent collaborative control is realized through the brand-new modular independent partition structure and the direct drive transmission-free scheme, the transmission gap and coupling error are eliminated from the mechanical root, the platform positioning precision, the dynamic response speed and the structural rigidity are simultaneously improved, the assembly and calibration process is simplified, the production and maintenance costs are reduced, and the high-precision operation of the semiconductor and optical detection fields is adapted to the harsh working conditions.