138results about How to "Loud noise" patented technology

The invention relates to the technical field of carrier communication, in particular to a multichannel power line carrier communication system which comprises a data acquisition module, a first determination module, a second determination module, a judgment module, a selection module, a sending module and a correction module. According to the invention, through an accurate data acquisition and real-time determination mechanism, complex environment changes in a power network can be effectively dealt with, stability and high efficiency of communication are ensured, channels with optimal parameters such as signal strength, noise, delay and the like are optimized through multi-stage screening and determination, channels with relatively large interference and noise are effectively avoided, and the communication efficiency is improved. Meanwhile, the correction module can adjust the intensity threshold value in real time, it is guaranteed that the system still maintains excellent communication performance when the number of channels fluctuates and the network load changes, and the problems that due to the fact that the attention degree of the influence of real-time environment changes on signal quality is low, channel selection is inaccurate, and verification results are deviated are effectively solved.

A heat dissipation base with a temperature control heat dissipation fan comprises a shell, a fan and a temperature control module are arranged in the shell, the temperature control module comprises a power interface, a control panel, a control panel adjusting contact and a temperature sensing head, the temperature sensing head is electrically connected with the control panel, the control panel is electrically connected with the fan, and the shell is provided with a hanging hole and an adjusting button. By means of the scheme, the temperature control module obtains external temperature information through the temperature sensing head to automatically judge the current heating value of the electronic equipment, and when the heating value is larger than or smaller than a certain step threshold value, the control panel immediately adjusts the fan to increase or decrease the rotating speed; the heat dissipation base has the advantages that electricity waste and high noise due to overhigh rotating speed when the heating value is low are avoided, poor heat dissipation effect due to overlow rotating speed when the heating value is high is also avoided, the product force is greatly improved, the heat dissipation base is provided with the control button to switch the fan state, the heat dissipation base can be hung due to the hanging hole, and the application range of the product is greatly widened.

The invention relates to a control method for a driving motor in the gear shifting period of a gearbox of an electric vehicle, and the method comprises the steps that in the first stage of gear engaging stages, the driving motor is controlled to be in a rotating speed control mode, and the gear engaging stages are in the gear shifting period; in the second stage of the gear engaging stage, the driving motor is controlled to be in a free mode or a torque mode for requesting zero torque, and the second stage is located after the first stage; and in a third stage of the gear engaging stages, the driving motor is controlled to be in a motor torque control mode (a torque mode requesting small torque), and the third stage is located after the second stage. The invention further relates to a computer storage medium, a computer program product and a transmission control unit (TCU).

The utility model relates to the technical field of ore smelting, in particular to an ore blender mixer for ore smelting, which comprises a blender mixer main body and a mixing shaft, support seats are welded at the bottoms of two sides of the blender mixer main body, and a control box is mounted on the outer side of each support seat. A mixing shaft is mounted in the mixer main body through a bearing seat, a driving motor is mounted on the outer side of one end of the mixer main body, the output end of the driving motor penetrates through the mixer main body and is connected with one end of the mixing shaft, and a discharge port is formed in the bottom of the mixer main body; the ore mixer has the beneficial effects that the buffer pads are mounted on the two sides of the inner wall of the mixer main body, so that the situation that ore raw materials collide with the inner wall in the mixing process, and noise is large can be prevented, the ore mixer is provided with an inner wall protection structure, the discharging position of a discharging opening can be shielded and sealed through mutual cooperation of a collection box and an extension frame, and the service life of the ore mixer is prolonged. Therefore, the ore mixer is provided with a structure for preventing blanking from splashing.

The invention discloses a protection device for a mechatronics motor, the protection device comprises a protection shell, a driving assembly, a ventilation assembly and an auxiliary ventilation assembly, a motor is arranged at the bottom in the protection shell, a ventilation slot I is formed in the top of the protection shell, the driving assembly comprises a storage slot, and the storage slot is formed in the back surface of the protection shell. When the working plate inclines, an extrusion frame on the working plate is separated from an air bag, at the moment, the elasticity of the air bag is recovered, negative pressure generated in the air bag is guided into the auxiliary ventilation box through a connecting pipe, the elasticity of a second spring in the auxiliary ventilation box is recovered, and at the moment, a movable baffle moves and is stored in the auxiliary ventilation box; a second ventilation groove in the outer side of the protective shell is exposed, so that the number of ventilation positions on the outer side of the protective shell is increased to three, the total amount of air entering the protective shell can be increased, and meanwhile, the temperature in the protective shell can be rapidly reduced by cooperating with work of a ball fan.

The utility model provides an automobile electronic water valve actuator which comprises a lower shell and an upper shell, a gear set, a motor and a PCB are arranged in an installation cavity of the lower shell, the upper shell is connected to the opening end of the lower shell, an upper positioning portion is arranged on the lower end face of the upper shell, a lower positioning portion is arranged on the lower shell, the upper positioning portion is matched with the lower positioning portion, and the upper positioning portion is matched with the lower positioning portion. The PCB is pressed and limited between the upper positioning part and the lower positioning part; the free end of an output shaft of the motor is sleeved with a magnetic ring, the PCB is connected with a Hall sensor used for sensing signals of the magnetic ring, and the Hall sensor is electrically connected with the PCB. According to the automobile electronic water valve actuator disclosed by the utility model, the accurate control of the output angle of the actuator is ensured by improving the assembly accuracy of parts and improving the control of the output angle of the motor.

The invention provides a sound insulation type dry-type transformer, and relates to the technical field of dry-type transformers, the sound insulation type dry-type transformer comprises a base, a shock absorption and noise reduction structure is installed on the upper end face of the base, a lower clamping piece is connected and installed at the top of the shock absorption and noise reduction structure, and a transformer body is installed above the lower clamping piece; an upper clamping piece is installed on the top of the transformer body, a circulating water cooling structure is further installed on the upper end face of the base, and the circulating water cooling structure is connected with the outer portion of the transformer body in an attached mode. The sound insulation type dry-type transformer can effectively solve the problems that in the prior art, when the dry-type transformer works, certain noise pollution can be caused to the nearby environment, the heat dissipation and cooling effects of the dry-type transformer are poor, and the situation that dust and impurities are prone to being blocked at the position of a fan in an air cooling heat dissipation structure of the dry-type transformer, so that noise generated when the fan works is greatly increased, and the service life of the dry-type transformer is prolonged. And the heat dissipation and cooling effects are greatly reduced, so that the overall service life of the transformer is shortened.

The low-noise freezer adopting the R290 working medium comprises a compressor, an evaporator, a condenser and a storage device, the outlet end of the storage device is connected with the inlet end of the compressor through a pipeline, the outlet end of the compressor is connected with the inlet end of the condenser through a pipeline, and the outlet end of the condenser is connected with the inlet end of the evaporator through a capillary tube. The outlet end of the evaporator is connected with the inlet end of the reservoir through a pipeline; wherein the compressor, the evaporator, the condenser and the storage device form a freezer circulating refrigerating system, and a refrigerant circularly conveyed in the freezer circulating refrigerating system is an R290 working medium. In the using process of the low-noise freezer, the cooler and the evaporator which are of a large-area structure are adopted, and the compressor with the large cooling capacity is adopted, so that the heat exchange effect of a circulating refrigerating system of the freezer can be enhanced, and food can be better stored.

The utility model discloses a detachable ventilating duct silencer, which relates to the technical field of ventilating ducts, and comprises a first cylinder, four corners of the bottom end of the first cylinder are fixedly connected with connecting blocks, the bottom end of the first cylinder is in lap joint with a second cylinder, the outer walls of the connecting blocks are in inserted connection with the top of the second cylinder, and the top of the second cylinder is in lap joint with the connecting blocks. And the top of the second barrel is in threaded connection with a bolt, the outer wall of the bolt is in threaded connection with the inner wall of the connecting block, and a filtering mechanism is inserted into the right portion of the first barrel. According to the detachable ventilating pipeline silencer, the inserting plate is pulled to drive the spring to stretch, so that the outer wall of the inserting plate is not connected with the inner wall of the first limiting block in an inserted mode any more, then the first limiting block can be pulled out, the outer wall of the first limiting block is not connected with the inner wall of the mounting plate in an inserted mode any more, and then the mounting plate can be taken out of the inner cavity of the first barrel. And the filter screen I, the filter screen II and the filter screen III on the placing plate are replaced or maintained, so that the effect of convenient disassembly is achieved.

The utility model relates to the field of fuel rod forming, and discloses a material receiving mechanism for RDF fuel rod forming, which comprises a shell, a rotating disc and a material pressing disc, the rotating disc and the material pressing disc are rotatably connected to the shell, the material pressing disc is provided with a discharging port, a cutting piece is slidably connected to the material pressing disc and located at the discharging port, a spring is arranged between the cutting piece and the material pressing disc, and a connecting rod is hinged to the shell. A material receiving disc is arranged at the end, close to the discharging port, of the connecting rod, and a pressing block is arranged at the end, away from the discharging port, of the connecting rod; the utility model has the following advantages and effects: the RDF fuel rod downwards presses the end part, close to the discharge port, of the connecting rod through the material receiving disc, the connecting rod vibrates when colliding with the stop block, and the fuel rod slides to the turntable along the inclined surface of the material receiving disc under vibration; the connecting rods are consistent in length, the pressing blocks are consistent in quality, the pressing blocks are always vertically downward, and the borne gravity is kept unchanged, so that the upward swinging time of the ends, close to the discharging opening, of the connecting rods is consistent, and the lengths of the fuel rods are consistent.

The utility model relates to a noise reduction type plastic fan blade, which belongs to the technical field of plastic fan blades, and comprises a shell, the outer wall of the upper end of the shell is provided with a limiting groove, the side wall of the shell is connected with four fan blades in an annular array manner, the outer wall of one side of each fan blade is provided with sawteeth, and the lower end of the shell is connected with sound absorption cotton. An inserting block is movably connected to the shell, a limiting column is fixedly connected to the lower end of the top of the inserting block, a clamping groove is formed in the outer wall of one side of the lower end of the inserting block, a clamping block mechanism is clamped to the lower end of the inserting block, the clamping block mechanism comprises a shell, a first limiting ring is fixedly connected to the inner wall of one side of the shell, and a first spring is arranged on the inner wall of the first limiting ring; the other end of the first spring is fixedly connected with a clamping block body, and a sliding rod is arranged on the side wall of the lower end of the clamping block body. The utility model solves the problem that a large amount of noise is generated during rotation due to corrosion or damage caused by the influence of the external environment when the existing plastic fan blade is exposed outside and operates for a long time.

The utility model discloses a circulating pump with a noise reduction function, which comprises a fixed bottom plate, a noise reduction cover is arranged at the top of the fixed bottom plate, a circulating pump body is arranged at the top of the fixed bottom plate, a water outlet and a water inlet of the circulating pump body are respectively provided with a connecting plate, and a circle of rubber strip is arranged on the surface of each connecting plate. The noise reduction cover is pushed to enable the clamping strip to enter the inner cavity of the clamping piece, when the noise reduction cover reaches a certain position, the clamping block can be extruded by the clamping ring to enter the inner cavity of the groove, the spring can be extruded to contract, and when the connecting plate and the connecting groove are spliced, the spring can stretch to push the clamping block to be clamped with the clamping ring. The purposes that noise reduction can be conducted on the circulating pump through the noise reduction structure, it is avoided that large noise is generated when the circulating pump is used, damage to the body and mind of a user due to long-time noise is prevented, and noise pollution is reduced when the circulating pump is used are achieved.

The application belongs to the technical field of drill bits, and discloses a noise reduction drill bit and a use method thereof, which comprises a drill body, a drill bit for drilling, an auxiliary drill bit arranged between the drill body and the drill bit for assisting drilling, a cleaning assembly arranged in the drill body for cleaning, and an auxiliary assembly arranged in the drill body for assisting ejection, a circular through hole for feeding is arranged in the drill bit, and one end of the circular through hole is in communication with the interior of the drill body. The application utilizes the equipment to push the push rod to move, so that the push plate can be well driven to move in the interior of the drill body. Meanwhile, the support rod, the positioning groove and the moving block are used in cooperation, so that the push plate can be assisted to push during the pushing process, the pushing effect is better, and the noise reduction effect is also better.

The present invention discloses a seismic event extraction method based on a B‑COSFIRE filter of a differential evolution algorithm. In the method of the present invention, only two values ​​are used to describe each pixel, one from a strip structure selection filter and the other from a strip structure end selection filter, and they are merged by summing. The B‑COSFIRE filter proposed by the present invention is universal because its selectivity is not predefined when implemented, but is determined by a prototype pattern given in an automatic configuration process. The weighted geometric mean used in the present invention is a nonlinear function that responds only when filters for all points of interest are present. This type of function is more robust to noise than other methods. The present invention can automatically select strip structures of different widths through a differential evolution algorithm, has a high degree of flexibility, and can pick up events of different widths. The present invention achieves significant extraction of event target contours, preparing for subsequent seismic interpretation, reservoir prediction, and the like.

The utility model provides a cup cover assembly and a food processor. According to one embodiment of the invention, the cup cover assembly comprises an outer support, an inner support and a glass cover; the inner support comprises a first abutting portion and a step portion which are connected, the outer support is arranged on the periphery of the step portion in a sleeving mode, the first abutting portion abuts against the upper surface of the glass cover, and the step portion is supported on the lower surface of the glass cover. According to the scheme, a user can observe food materials in the food processor through the cup cover, and meanwhile the risk that the user is scalded can be reduced.

The present invention relates to a goods transport facility for transporting goods along a transportation path including a curved part, and particularly relates to a goods transport facility provided with a plurality of transport carriages that move along a pair of left and right rails, which are provided along the transportation path, so as to transport goods. A rail width adjusting mechanism 50 capable of changing a rail width between the left and right rails 30L and 30R is provided in at least one of a curving region 40a and an S-curve region 40b in the curved part of the transportation path.

The utility model discloses a mirror image reciprocating motion device, which relates to the technical field of motion devices and comprises a shell, a driving component is arranged at one end of the shell, a rotating column is rotatably connected in the shell, the driving component is used for driving the rotating column to rotate, a guide chute is arranged on the shell, and two guide pieces are slidably connected onto the guide chute. An annular guide groove is formed in the outer wall of the rotating column, each guide piece is provided with a guide connecting assembly, each guide piece is matched with the corresponding annular guide groove structure through the corresponding guide connecting assembly, and the rotating column is used for driving the two guide pieces to do mirror image reciprocating motion. Compared with the prior art, the mirror image reciprocating motion device has the advantages that smooth reciprocating motion can be achieved without reserving a large fit clearance through the arrangement mode, large noise cannot be generated, abrasion can be delayed, and the service life of the mirror image reciprocating motion device can be prolonged.

This invention relates to a hyperbaric oxygen chamber system with adjustable oxygen concentration. The system includes a main unit and a chamber. The main unit comprises a main control module, an oxygen regulation module, and a pressure regulation module, all electrically connected to the main control module. The pressure regulation module includes a low-oxygen air regulation submodule and a pressure-maintaining air submodule. The pressure-maintaining air submodule includes a first air compressor, a pressure relief valve, and a first sensor. The oxygen regulation module includes a second air compressor, a separation valve, a molecular sieve tower, a flow-limiting valve, and a vacuum pump. The low-oxygen air regulation submodule includes a three-way valve and a one-way valve. This invention's adjustable oxygen concentration hyperbaric oxygen chamber system can reduce the production cost of hyperbaric oxygen chamber systems, improve the user experience, and allow the oxygen concentration within the chamber to be adjusted below that of air, thus expanding its application to low-oxygen training and testing environments.

The invention discloses a rotary machining device and method for a biological space capsule, and belongs to the technical field of biological space capsule machining. The rotary machining device for the biological space capsule comprises a base, a cushion plate is arranged in the middle of the upper end of the base, five machining tools are arranged on one half circle of the outer portion of the cushion plate, and two pairs of machining tools are arranged on the other half circle of the outer portion of the cushion plate in a mirror image mode. The problems that a cavity needs to be reserved in the front end of an existing multi-station machining machine tool in the middle position, and the machining efficiency is affected are solved, a machining tool connected with the first sound insulation ring is driven by the first sound insulation ring to transversely slide in a fixing frame along a threaded rod under the condition that the first sound insulation ring is supported by a transmission frame, and the machining efficiency is improved. And after transmission of the first bevel gear and the second bevel gear, the first sound insulation ring can relatively move after rotation, and the first sound insulation ring is relatively moved and unfolded to expose one side of the upper end of the pad, so that the raw materials in the biological space capsule can be conveniently taken out.

The invention discloses a construction method for removing bracket concrete through high-pressure water jet. The construction method comprises the following steps that S1, construction preparation is made; s2, completing installation and construction of the high-pressure water jet system; s3, parameters of the high-pressure water jet system are set; s4, starting to carry out experimental breaking; and S5, starting formal breaking. The concrete is of a microporous structure, the ultimate strength of the concrete is far smaller than the compressive strength of the concrete when the concrete bears tensile stress, the reinforcing steel bars have the characteristics of high tensile strength, dense surfaces of the reinforcing steel bars, no micropores and incapability of drilling in high-pressure water, so that high-pressure water flow is injected into the surface of the concrete, and when the high-pressure water flow penetrates through concrete pores, internal pressure is generated; when the internal pressure exceeds the tensile resistance of the concrete, the concrete is broken and separated, and the internal reinforcing steel bars are not damaged, so that the aims of protecting the reinforcing steel bars from being damaged due to the removal of the concrete and completely removing the concrete are fulfilled, and the construction quality is effectively ensured.

This invention provides an energy-saving large-scale cooktop radiant heating core module device and its preparation method. The device includes a heat-insulating heating element, which comprises a bottom fixed mounting plate. Multiple blank plate modules are evenly distributed on the bottom fixed mounting plate. Each blank plate module has a heat-insulating and insulating module assembly on its outer side. Each heat-insulating and insulating module assembly has an easily removable protective plate on its outer side, and each easily removable protective plate has an overload protector module on its outer side. This invention solves the problems existing in traditional kitchen stoves by integrating the energy-saving large-scale cooktop radiant heating core module device into the stove. Furthermore, the heating method of the energy-saving large-scale cooktop heating core module is noiseless and generates no waste heat, resulting in a clean and comfortable operating environment, optimizing the kitchen environment, not raising the operating environment temperature, eliminating the feeling of being roasted by an open flame, eliminating radiation, improving the user experience, and making operation safer.

The utility model relates to the technical field of high-speed precision punching machines, and discloses a shockproof foot device for a high-speed precision punching machine, which comprises a placing seat, an upper cover fixed at the bottom of the placing seat, and a base arranged below the upper cover, according to the high-speed precision punching machine damping device, the damping mechanism can be conveniently limited through the limiting mechanisms, damping can be conveniently conducted on a high-speed precision punching machine through the damping mechanisms, damping can be conveniently conducted on the high-speed precision punching machine through the push rod, the connecting block, the connecting rod and the limiting blocks which are used in a matched mode, and the high-speed precision punching machine is convenient to use. The high-speed precision punching machine is prevented from generating great vibration and noise due to rapid punching in the punching process, and meanwhile, the high-speed precision punching machine also can cause large impact on the ground, so that normal rest of people is influenced, and the service life of the high-speed precision punching machine and the service life of a floor are shortened.

The invention provides a micro-perforated plate silencer, and relates to the field of silencing. The noise reduction device comprises a plurality of partition plates stacked in sequence, folded edges are fixedly arranged on the partition plates, the folded edges on the adjacent partition plates are fixedly connected through fixing bolts, sound absorption cavities are formed in the partition plates, noise reduction holes are formed in the inner walls of the sound absorption cavities in a penetrating mode, and first sound absorption cotton is arranged in the sound absorption cavities. The silencer has a better silencing effect.

The utility model discloses a kind of rotary hook mechanism and sewing device, it is related to sewing equipment technical field, and it includes: fixed support;Motor;Motor is fixed in the first surface of fixed support, the motor rotating shaft of motor is rotatably installed in support through hole, and the end of motor rotating shaft extends to the second surface side of fixed support, and first pulley is set on end portion;Rotary hook;Rotary hook located in the second surface side includes: rotary hook shaft, second pulley, rotary hook main body and rotary hook shell;Rotary hook shaft's first end is fixedly connected with fixed support;The outer periphery of rotary hook shaft is set with second pulley, second pulley can relatively rotate around the axis of rotary hook shaft, to drive rotary hook shell around the axis of rotary hook main body;Synchronous belt;Synchronous belt is set on the outer periphery of first pulley and second pulley.This technical solution changes the traditional transmission mode, through synchronous belt transmission and rotary hook shaft fixedly, reduce noise, and simultaneously, synchronous belt is convenient for manufacturing and installation, reduce the manufacturing and assembly cost of this rotary hook mechanism.

The utility model discloses a mold base plate for a corrosion-resistant large mold, and relates to the technical field of mold equipment. The mold base plate comprises a mold base plate body, an anti-corrosion frame body is fixedly arranged on the outer side surface of the mold base plate body, a supporting sliding plate is arranged in the mold base plate body in a sliding mode, cushioning assemblies are arranged between the lower surface of the supporting sliding plate and the inner surface of the mold base plate body, a sliding groove is formed in the upper surface of the supporting sliding plate, and the supporting sliding plate is arranged in the sliding groove. A sliding groove is formed in the middle of the supporting sliding plate, a sliding block is arranged in the sliding groove in a sliding mode, the upper surface of the sliding block is fixedly connected with the lower surface of a vertical plate, a vertical plate is arranged on the supporting sliding plate in a sliding mode, and a groove is formed in the upper surface of the vertical plate. In the production and use process of the mold supporting and clamping device, the situation that equipment makes large noise can be avoided, and therefore noise pollution can be avoided.

The food processing machine comprises a main machine assembly and a stirring cup assembly, the stirring cup assembly comprises a cup body, a cutter head, a smashing piece and a cup bottom shell, the main machine assembly comprises a main machine shell, a frequency conversion brushless motor is arranged in the cup bottom shell, a power panel is arranged in the main machine shell, and the power panel is electrically connected with the frequency conversion brushless motor through a coupler; a motor heat dissipation air channel is formed in the cup bottom shell, a main machine heat dissipation air channel is formed in the main machine shell, the motor heat dissipation air channel is communicated with the main machine heat dissipation air channel when the stirring cup assembly is installed on the main machine assembly, the cutter head is provided with a heating piece, and a motor containing cavity is formed between the variable frequency brushless motor and the cutter head. And a temperature controller and a fuse link are also arranged on the bottom wall of the cutterhead in the motor accommodating cavity. The crushing part is directly driven by the variable-frequency brushless motor, so that the driving reliability is improved; and the variable-frequency brushless motor and the power panel are separately arranged and are respectively cooled, so that the reliable heat dissipation is ensured on the premise of improving the driving performance.

The invention relates to the technical field of heat dissipation devices, and discloses a low-noise heat dissipation fan, comprising a base and double-layer blades, wherein a bearing is arranged at the center of the base, and a stator is arranged in a circumferential array on the side surface of the bearing, the stator is an iron core, and is wrapped by a painted coil to form an electromagnet, the energization state of the coil is controlled by a control circuit, and a Hall sensor is arranged for detection, the double-layer blades are composed of a rotor, a connecting ring and blades, the rotor is located at the axis center of the double-layer blades, and is cylindrical, a crankshaft connected to the stator is arranged at the axis center of the bottom of the double-layer blades, blades are arranged in a circumferential array on the side surface of the rotor and are connected to the connecting ring, and blades are also arranged in a circumferential array on the outer side surface of the connecting ring to form a double-layer blade structure, the inner wall surfaces of the rotor and the connecting ring are evenly arrayed with permanent magnets, and the permanent magnets located in the connecting ring and the permanent magnets in the rotor are arranged at different angles.

This utility model belongs to the field of trolley technology, and specifically relates to a trolley that facilitates straight-line travel. It includes a balance scooter and a trolley body, connected by a connecting frame. The connecting frame is detachably connected to the trolley body and rotatably connected to the balance scooter. The balance scooter has a positioning groove, and the connecting frame has a positioning element and an elastic element. The elastic element drives the positioning element to engage with the positioning groove, fixing the balance scooter and the connecting frame relatively, thus allowing the trolley to maintain straight-line travel or maintain a certain angle of rotation. Under external force, the positioning element can move relative to the positioning groove, allowing the balance scooter and the connecting frame to rotate relative to each other, thus enabling the trolley to turn flexibly. The purpose of this utility model is to provide a user-friendly trolley that facilitates straight-line travel.

The embodiment of the utility model discloses an adjusting assembly, an optical-mechanical mechanism and a projector. The adjusting assembly comprises a support, a damping block and an adjusting piece. The support comprises a body and a rotating shaft arranged on the body. The damping block sleeves the rotating shaft. The adjusting piece at least partially sleeves the damping block and can rotate around the rotating shaft relative to the damping block, focusing of the ray machine mechanism and the projector is achieved by rotating relative to the rotating shaft, and the adjusting piece can be fixed at a certain rotating angle through the damping effect of the damping block when driving is stopped by external force. Therefore, the focusing position is fixed at a clear image position. Compared with a damping structure of a metal spring or a plastic spring, the damping block can be in surface-to-surface contact with the adjusting piece through the elastic deformation capacity of the damping block, the connecting area of the damping block and the adjusting piece is increased, stress between the damping block and the adjusting piece is more evenly distributed, and therefore the situation that acting force is excessively concentrated to act on a small area range is avoided; therefore, large abrasion and scraping noise are prevented from being generated in the focusing process.