94results about How to "Increase volume" patented technology

The present application provides a method for diagnosing and / or evaluating the presence or absence, severity or degree of the improvement of a retinal disease in a subject, which comprises determining and / or evaluating circulatory parameters, retinal function, retina morphology and / or visual relating quality of life (QOL).

The invention provides an external assembly type tower crane anti-climbing device, and belongs to the technical field of tower crane anti-climbing. Comprising a plurality of frames, a plurality of mounting plates are fixed to the side faces of the frames, the adjacent frames are perpendicularly arranged, the mounting plates between the adjacent frames are vertically aligned, and the vertically aligned mounting plates are fixedly connected through screws. By arranging the frame, the panel and the round rollers, when the tower body has a certain height and an entrance for entering a control room is located on the side face of the tower body, the fence composed of the frame and the panel is fixed to the periphery of the tower body, and when a person wants to climb the tower body, due to the fact that the surface of the panel is smooth and the feet of the person have no acting points, the person cannot climb the tower body, and the safety of the person is improved. When a person binds a hook on a rope and hangs the rope on the tower body, the person wants to climb the tower body with the help of the rope at the moment, and when the feet step on the panel, the round roller rotates, so that the feet of the person have no leveraging point, the person is further prevented from climbing the tower body, and safety protection for the person is achieved.

This utility model provides a composite perforated wood-plastic composite sound-absorbing wall panel, relating to the technical field of building materials. The composite perforated wood-plastic composite sound-absorbing wall panel comprises, from top to bottom, a veneer layer, a wood-plastic composite layer, and a sound-absorbing layer. The veneer layer has evenly distributed through-holes, and the wood-plastic composite layer has sound-absorbing grooves. The through-holes and sound-absorbing grooves are interconnected, and the sound-absorbing grooves are dovetail grooves. The total thickness of the wall panel is ≤19mm. This utility model achieves a significant improvement in the sound absorption performance of the composite wall panel by designing through-holes in the veneer layer, designing sound-absorbing grooves communicating with the through-holes in the wood-plastic composite layer (designing the sound-absorbing grooves in the dovetail groove form), and then designing a sound-absorbing layer on the bottom surface of the wood-plastic composite layer. The sound absorption principle of this utility model is: using the Helmholtz resonance principle, combined with the oblique wall reflection of the dovetail groove and the excellent sound absorption performance of the wood-plastic composite material itself, to achieve a synergistic effect and significantly improve the sound absorption performance of the composite wall panel.

A vehicle front structure of the present application is provided with a vibration absorber. The vibration absorber has a recess that forms an internal space, an upper-side through portion that links a space above the vibration absorber to the internal space, a lower-side through portion that links a communication space linked to the upper-side through portion in the internal space to a space below the vibration absorber, and a pair of soundproofing portions. The pair of soundproofing portions separate the communication space and a space adjacent to the communication space in the internal space in the vehicle width direction.

The invention discloses an etching machine for a display screen PCB, and relates to the technical field of wet etching, the etching machine comprises a workbench, a rotating roller device, a first hydraulic cylinder, a second hydraulic cylinder, a motor, an air blowing fan and a rotating sprayer, the bottom of the inner wall of the workbench is provided with a water storage tank, the bottom of the water storage tank is provided with a water outlet, the rotating roller device is arranged on the inner wall of the workbench, and the rotating roller device is arranged on the inner wall of the workbench. The first hydraulic cylinder is fixedly installed on the outer wall of the workbench, the second hydraulic cylinder is fixedly installed on the outer wall of the workbench, and the control device is used for controlling whether the rotating spray head is communicated with the first hydraulic cylinder or not and arranged on the inner wall of the workbench and controls fluid to be connected or disconnected through mechanical coincidence and dislocation of through holes of the second water conveying opening and the first water conveying opening. Rapid and accurate response without an intermediate link is realized, and uneven etching caused by spraying angle deviation or valve delay is effectively eliminated.

The utility model relates to the technical field of alarm lamps, and discloses a sound-light alarm lamp panel which comprises a shell mechanism, a sound-light alarm mechanism is assembled in the shell mechanism, the shell mechanism comprises a main case, the upper end and the lower end of the main case are open, the bottom end of the main case is in threaded connection with a stand column, the stand column is hollow, and the bottom end of the stand column is fixedly connected with a base. According to the utility model, the power chip and the power amplification circuit are added, the driving power of the loudspeaker is improved, the volume is increased, the symmetrical wide-area loudspeaker structure design is adopted, the sound transmission is optimized, the bidirectional sound production is realized, the sound can be transmitted to an area needing warning more quickly, and the warning effect is better. In addition, the control main board can drive the loudspeaker to give out traditional alarm sounds, various different types of sounds such as voice alarm and simulation siren sounds can be set, different alarm events correspond to different sounds through programming of the control circuit, and therefore people can know alarm reasons more visually.

The application relates to a stone-plastic floor and an extrusion molding preparation method of the stone-plastic floor, and relates to the stone-plastic floor processing technical field.The stone-plastic floor comprises polyvinyl chloride resin, heavy calcium carbonate, calcium-zinc stabilizer, abrasive powder, internal lubricant, and external lubricant; and the preparation steps comprise feeding and mixing, extrusion, calendering, film covering, traction and cutting, and slotting; the low-temperature cold mixing realizes energy saving and consumption reduction, the stabilizer decomposition and lubricant volatilization problems caused by high temperature are avoided, the filler dispersion uniformity and interface bonding force are improved, the large-diameter specification extruder is adopted to improve the production efficiency, the material uniform plasticization is guaranteed by cooperating with the melting section cooling area, the processing stability and the finished product qualification rate are effectively improved, the stability, wear resistance and waterproofness of the stone-plastic floor are finally obviously improved, the service life is prolonged, and the stone-plastic floor has the advantages of environmental protection and production efficiency.

The present invention comprises: a first tray for forming a portion of an ice-making cell; a second tray forming the other portion of the ice-making cell, and capable of moving relative to the first tray; an ice bin for storing ice separated from the first and second trays; and a full-ice sensing lever for moving together with the second tray in a predetermined range.

This invention discloses a bidirectional flow electrolytic cell and its series system, specifically relating to the field of chemical and environmental protection technology. The invention includes a main electrode electrolytic flow cell, which comprises an electrolytic cell shell. Several insertion slots for the auxiliary electrode electrolytic chamber are provided on the top surface of the shell. By connecting multiple main electrode electrolytic flow cells in series, this invention achieves bidirectional flow electrolysis, significantly increasing the volume of the electrolytic cell. Furthermore, the main electrode electrolytic flow cells in the entire series system are completely interconnected, allowing the electrolyte to flow through the main electrode electrolytic flow cells for a relatively long time. Each time the electrolyte passes through a section of the main electrode electrolytic flow cell, it undergoes repeated electrolysis, ensuring a more complete electrolysis reaction and enabling continuous flow electrolysis, thus improving the wastewater treatment capacity of electrolysis technology.

The utility model discloses a kind of slurry flow control system for shield machine and shield machine with it, comprising: the slurry cabin of being laid in the shield body of shield machine, and the transition cabin, grouting system and slurry discharge system of being laid outside shield machine, and air pressure control system. Transition cabin is equipped with liquid level detector for detecting the liquid level in it and first pressure detector for detecting the pressure in it, and transition cabin is connected with air pressure control system to adjust the air pressure in it, and transition cabin is also connected with slurry cabin, to control slurry cabin pressure by slurry pressure and air pressure in transition cabin, and then make slurry cabin pressure match face water and soil pressure. Transition cabin and slurry cabin are also connected with grouting system to inject slurry respectively, and slurry cabin is also connected with slurry discharge system to discharge slurry outward. The new system can ensure the stability of liquid level and air pressure in transition cabin, and then control the stability of slurry cabin pressure, so that slurry cabin pressure matches face water and soil pressure.

The application discloses a method for digesting and separating fluorinated aluminum by program, which comprises the following steps: placing a catalyst with metal elements supported on alumina as a carrier into a reaction container of a cluster digestion device, adding hydrochloric acid and / or nitric acid, setting a digestion program, introducing inert gas for pre-pressurization, performing primary digestion, and simultaneously starting a condensation reflux atomizer; after the program is completed, adding hydrofluoric acid, setting a digestion program, and performing secondary digestion; after the digestion is completed, entering a cooling and crystallization program, performing cooling and crystallization, and separating to obtain a sample solution to be detected and a solid; the solid is dried and calcined to obtain fluorinated aluminum crystals, and the liquid is used for detecting the content of metal elements. The method is applied to the digestion treatment of the alumina sample with metal elements supported thereon, has a large sample treatment range, complete digestion, no volatile loss of elements, and can separate AlF3 in an alpha crystal form through the program digestion of the digestion device.

The utility model relates to the technical field of clothes, in particular to a novel safety sub-pocket for trousers, which comprises a sub-pocket structure, the sub-pocket structure is arranged in a main pocket structure of a trousers body, a three-dimensional storage cavity is formed between the sub-pocket structure and the trousers body, and the three-dimensional storage cavity is of an inverted trapezoid structure. The top of the three-dimensional storage cavity is an open end, an elastic safety device is arranged at the open end, and an anti-sliding safety device is further arranged on the inner side wall of the three-dimensional storage cavity. According to the child pocket, a composite safety structure of the elastic bridle and the anti-slip strip is additionally arranged, so that the self-adaptive contraction / expansion function of the opening can be guaranteed, articles are prevented from slipping off, the articles can be conveniently taken, and the purpose of remarkably improving the safety is achieved through a dual-protection mechanism; the three-dimensional storage cavity is designed to be of an inverted trapezoid structure, a progressive storage space is formed, the volume of the sub-pocket structure can be effectively increased, and articles can be conveniently taken and used.

The invention discloses a telescopic axle distance self-adaptive space expansion and escape automobile which solves the problems that an existing automobile is fixed in space and free of autonomous escape, a telescopic structure is prone to twisting, and hidden danger of holes exists in a chassis. The vehicle comprises a front vehicle body, a rear vehicle body, a flexible telescopic connecting section (3), a telescopic driving and braking system, an integrated force bearing protection plate (1) and an auxiliary force bearing guide beam (2). The integrated force-bearing protection plate (1) integrates chassis protection, force bearing, torsion prevention and guiding, and is extremely simple in structure and extremely high in strength; the auxiliary force-bearing guide beam (2) and the protective plate cooperate to reinforce the rigidity of the vehicle body; the axle distance can stretch and retract within 0.3-1.5 m, and the space can be expanded; the self-rescue is realized by locking the single-axle wheel and matching with the wheel base expansion and contraction. The method is flexible, practical, trafficability and safety, the technology is mature, mass production is easy, the method is suitable for front-drive and rear-drive various vehicle types, and the application prospect is wide.

This utility model discloses a waterway anti-freezing and cracking structure, which can prevent waterways in various water-using devices from freezing and cracking due to ice formation. The waterway anti-freezing and cracking structure includes a water-conducting body, a base, an elastic membrane, a piston, and an elastic element. The water-conducting body has at least one waterway with an opening connecting to the surface of the water-conducting body. The base is detachably connected to the opening and presses the periphery of the elastic membrane tightly against the periphery of the opening. The base has a movable cavity. The piston is movably fitted within the movable cavity. The elastic element is disposed within the movable cavity and acts on the piston to abut against the elastic membrane. The elastic force of the elastic element is greater than the maximum water pressure within the waterway.

The embodiment of the invention provides clothes treating equipment. The clothes treating equipment comprises a box body and a barrel body assembly. The barrel assembly is arranged in the box body, and the barrel assembly is provided with a clothes processing cavity; the width of the box body in the left-right direction of the clothes processing equipment is Ymm; y / V is larger than or equal to 4.5 and smaller than or equal to 8.5. According to the clothes treatment equipment provided by the embodiment of the invention, the width of the box body is associated with the volume of the clothes treatment cavity, and / or the washing capacity of the clothes treatment equipment is associated with the width of the box body, and in the design stage, when the volume or the washing capacity needs to be increased, the volume or the washing capacity can be increased by adjusting the width of the box body; therefore, the space of the box body in the width direction can be increased, the radial size of the barrel assembly can be increased, and the volume and / or the washing capacity can be increased.

The utility model relates to the field of low-temperature liquid tank containers, and discloses an adsorbent device which comprises a round pipe, a support is installed at one end of the round pipe, a connector assembly is installed at the other end of the round pipe, an adsorption chamber is defined by the inner wall of the round pipe, the support and the connector assembly, and the tail end of the connector assembly is connected with a branch pipe. An inner hole is formed in the support in a penetrating mode, the adsorption chamber is communicated with an interlayer between the inner end socket and the outer end socket through the inner hole, the tail end of the branch pipe penetrates through the outer end socket and extends to the outer side, and a foil piece used for sealing the inner hole is arranged in the inner hole. After the interlayer is vacuumized, gas is filled from the outer side end of the branch pipe to break through the foil, so that the adsorption chamber in the circular pipe is communicated with the interlayer, and the gas adsorption function in the interlayer is realized; and the circular pipe can be fixedly attached to the inner sealing head, so that the interlayer space occupied by the device is reduced, the volume of the inner container is effectively increased under the condition that the overall dimension is not changed, and the filling amount of liquid in the tank is increased.

The present application provides a kind of forging die and valve cover flashless forging method, the forging die includes mutually slidingly connected die inner ring and die outer ring, die inner ring has first accommodating cavity suitable for accommodating blank, die outer ring has inner wall surface suitable for accommodating blank and die inner ring, and the inner wall surface is jointly enclosed with the top surface of die inner ring to form second accommodating cavity suitable for accommodating blank, first accommodating cavity is communicated with second accommodating cavity, die outer ring has start forging state that is lifted to first height, and finish forging state that die outer ring bottom surface is flush with die inner ring bottom surface, slidingly connected die inner and outer ring can accommodate blank of different sizes and shapes, die inner ring and die outer ring are switched between start forging state and finish forging state by sliding to complete the forging of blank, and due to the downward movement of die outer ring following blank during forging, the radial deformation generated by blank forging pressure is converted into axial allowance, the generation of flash is reduced, and processing efficiency and processing quality are improved.

This application discloses a power unit and a nail gun, belonging to the field of power tool technology. The power unit includes a first cylinder and a second cylinder. The first cylinder has a first cavity and an inlet / outlet hole that communicates with the first cavity for fluid to enter and exit. At least a portion of the second cylinder is located within the first cylinder. The second cylinder has a second cavity that communicates with the first cavity. One of the first and second cylinders is connected to the nail gun body, while the other acts on the firing pin of the nail gun. The first and second cylinders can extend relative to each other to drive the firing pin out of the gun body. This design effectively increases the volume of the power unit, allowing it to store more fluid, thereby increasing the power of the power unit and the striking force of the nail gun. Simultaneously, by having either the first or second cylinder directly act on the firing pin, the size of the power unit is reduced, thus reducing the size of the nail gun.

This invention provides an electronic device, comprising a housing with a receiving cavity and a sound-generating unit disposed within the receiving cavity. The sound-generating unit divides the receiving cavity into a front cavity and a rear cavity. The housing is provided with a front sound outlet and a rear sound outlet. The sound-generating unit has a first side and a second side that are opposite to each other along the vibration direction of the vibration system. The first side communicates with the front cavity, and the second side communicates with the rear cavity. An airflow channel is provided between the magnetic circuit system and the first diaphragm for the airflow of a second diaphragm. The sound waves of the second diaphragm facing the first side radiate outward through the airflow channel and together with the sound waves of the first diaphragm facing the first side radiate towards the first side. The sound waves of the first diaphragm facing the second side and the sound waves of the second diaphragm facing the second side radiate together towards the second side. The rear sound outlet includes a rear front sound outlet, and the ratio of the area of ​​the rear front sound outlet to the effective radiation area of ​​the second diaphragm is 5%-100%. This invention can solve the problem of low mid-frequency loudness in existing electronic devices.

This utility model discloses an atomizing core, an atomizing device, and an aerosol generating apparatus. The atomizing device includes an atomizing core comprising a liquid guide and a heating element. The liquid guide has an atomizing chamber for communicating with an air guide channel in the outer casing. The atomizing chamber is offset towards a first circumferential side of the liquid guide, or the atomizing chamber has a portion of its structure penetrating the first circumferential side of the liquid guide, making the atomizing chamber more offset towards the side wall of the outer casing, thus improving the communication between the atomizing chamber and the air guide channel. The air guide tube of this atomizing device is formed on the side of the casing. Compared to a central rod oil cup structure, the air guide tube occupies less internal space in the casing, increasing the volume of the liquid storage chamber. Furthermore, due to the larger volume of the liquid storage chamber, the aerosol generating matrix can be added from the liquid storage chamber, making addition more convenient. Moreover, this atomizing device has fewer components, which facilitates automated assembly, reduces material costs, and improves product competitiveness.

The utility model discloses a ceramic membrane assembly and a unit group applying the ceramic membrane assembly, and belongs to the field of beer filtration, the ceramic membrane assembly comprises a water receiving chassis, twelve single membrane groups and two empty membrane groups, the top of the water receiving chassis is provided with a frame, the twelve single membrane groups are connected in series through six communicating pipes, and the two empty membrane groups are communicated with the frame. The inner wall of each single membrane group is fixedly connected with a clear liquid outlet a, the side wall of the water receiving chassis is provided with a booster pump, the input end of the booster pump is fixedly connected with a membrane group inlet, the output end of the booster pump is fixedly connected with a flow guide channel, and two clear liquid upper outlet pipelines are communicated between the two empty membrane groups and the twelve single membrane groups. The inner wall of the upper clear liquid outlet pipeline is fixedly connected with a lower clear liquid outlet pipeline; by arranging twelve groups of single membrane groups and adopting a 2-serial * 6-parallel topological structure, and arranging two empty membrane groups at the tail end, the volume in the circulating pipe is effectively enlarged, the water hammer is reduced, the filtering time is prolonged, and the filtering efficiency is ensured.

The utility model discloses a press machine guide path oil collecting mechanism which comprises an oil collecting groove and an oil baffle plate, the oil collecting groove is fixed on a table body of a press machine and located under a sliding block copper guide rail and a stand column guide rail of the press machine, and the oil baffle plate is arranged under the sliding block copper guide rail. The oil collecting groove is composed of an upper hopper type cavity, a middle inclined wall contraction section and a lower lengthened oil collecting cavity which are continuously and integrally formed, the aligned parts of the upper hopper type cavity, the middle inclined wall contraction section and the lower lengthened oil collecting cavity are continuously communicated in the vertical direction to form a straight-through type oil channel, the oil baffle plate is integrally formed by a flaring flow guide section and a vertical drainage section, and the top of the flaring flow guide section is fixed to the bottom of a sliding block of the press machine. A gap between the inner side wall of the vertical drainage section and the stand column guide rail forms an oil guide channel, and the lower portion of the vertical drainage section extends into the straight-through type oil liquid channel. The oil return device has the advantages that the oil return speed is high, unsmooth oil return cannot occur when the oil quantity is large or a machine runs at a high speed, the oil collecting groove is large in volume and sufficient in height, and oil splashing can be effectively prevented when the machine runs at a high speed or airflow disturbance exists in a workshop.

The utility model discloses electronic equipment, and belongs to the technical field of communication equipment. The disclosed electronic device includes: a housing; the loudspeaker is arranged in the shell, the loudspeaker comprises a loudspeaker main body, and the loudspeaker main body and the shell jointly define a first rear cavity; or, the loudspeaker further comprises a first shell, the loudspeaker body is located in an inner cavity of the first shell, and a first rear cavity is defined by the loudspeaker body and the first shell; and the camera module comprises a second shell, and an inner cavity of the second shell is communicated with the first rear cavity.

This utility model discloses a mobile fireproof coating delivery pump, including an electric mobile vehicle. A pump body hopper is movably connected to the upper end of the rear of the electric mobile vehicle. A filter screen safety protection structure is provided at the upper end of the pump body hopper. A delivery pump is diagonally inserted into the pump body hopper. The output end of the delivery pump is provided with a discharge port. The electric mobile vehicle includes a supporting frame. An L-shaped tubular fixing frame is fixedly connected to the supporting frame. Both sides of the bottom end of the L-shaped tubular fixing frame are provided with hopper limiting plates. Both sides of the upper end of the L-shaped tubular fixing frame are provided with hopper locks for locking the pump body hopper to fix or release it. A limiting pull wire is provided on one side of the upper end of the L-shaped tubular fixing frame for limiting the pump body hopper after it is flipped. A bushing is provided at the rear of the L-shaped tubular fixing frame. The pump body hopper can be flipped at an angle using the bushing as a fulcrum. Advantages: The combination of the transportation vehicle and the delivery pump in an integrated design saves costs and improves efficiency.

The application relates to a new type of faucet assembly for adjusting cold and hot water, which comprises a water outlet main body and two sets of adjusting assemblies. The water outlet main body is provided with a water outlet, a cold water outlet and a hot water outlet. The cold water outlet and the water outlet are communicated, and the hot water outlet and the water outlet are communicated. The two sets of adjusting assemblies are arranged in the water outlet main body and used for adjusting water inlet quantity. The water outlet end of one adjusting assembly is communicated with the cold water outlet, and the water inlet end of the adjusting assembly is communicated with a cold water pipe. The water outlet end of the other adjusting assembly is communicated with the hot water outlet, and the water inlet end of the adjusting assembly is communicated with a hot water pipe. The application has the effect that users can more easily adjust the water outlet temperature of the faucet to the most suitable use temperature.

This invention relates to the field of robot control technology, and more particularly to a multimodal environmental perception adaptive robot, comprising: an environmental perception component for acquiring visual images, spatial point clouds, human body thermal distribution, temperature and humidity, and illuminance; a multimodal feature extraction component for calculating the illumination degradation factor, the approach potential of the crowd, and the environmental disturbance index; a scene analysis unit for determining whether to adapt to a dangerous, attention-based, or conventional type based on the environmental disturbance index, determining the fusion weight of the positioning mode based on the illumination degradation factor, and determining the walking speed and narration volume based on the approach potential of the crowd; a behavior strategy grader for outputting the initial speed, volume, and path planning mode; and an adaptive feedback device for monitoring the trend of the environmental disturbance index and triggering strategy upgrades. This invention achieves stable positioning under low light conditions, smooth speed and volume adjustment in dynamic crowd flow, and adaptive services with quantified environmental disturbances, ensuring the operational safety and narration quality of the ancient book exhibition area.

The frost crack prevention water mixer comprises a water mixing channel shell and a frost crack prevention mechanism, the water mixing channel shell is provided with a cold water inlet, a hot water inlet, a water mixing cavity, a pressure relief opening and a plurality of water outlets, and the cold water inlet, the hot water inlet, the pressure relief opening and the water outlets are all communicated with the water mixing cavity; the frost crack prevention mechanism comprises a fixing block, a diaphragm and an elastic piece, the fixing block and the diaphragm are fixedly connected to the pressure relief opening, the diaphragm seals the pressure relief opening, one end of the elastic piece abuts against the fixing block, the other end of the elastic piece is fixedly connected with a cushion block, and the elastic piece is used for driving the cushion block to move in the direction away from the fixing block so that the cushion block can abut against the diaphragm. According to the frost crack prevention water mixer, the expansion volume of ice can be absorbed, and the possibility that the water mixing channel shell and the valve are cracked and damaged is reduced.

This specification provides a system and apparatus for constructing an animal model of spinal glioma, relating to the field of intelligent medicine. The system, executed by a robot, includes: a puncture point localization module configured to locate the highest point of the spine in its natural state as the puncture point; a spine exposure module configured to locate points at a first distance above and below the highest point of the spine along the spinal direction, forming a line segment; controlling the cutting of the dorsal skin of the animal sample along the line segment to expose the spine; a puncture needle insertion module configured to control the puncture needle to penetrate the puncture point perpendicular to the vertebral interface at a first speed until the puncture needle penetrates the spinal cord tissue; controlling the puncture needle to retract a third distance and pause for a first time; a cell suspension injection module; and a puncture needle withdrawal module configured to control the withdrawal of the puncture needle, thus obtaining the animal model. This application provides insights for clinical research on the molecular characteristics of spinal glioma and the identification of potential therapeutic targets.

The utility model provides a kind of folding heightening device applied to box, comprising: harvesting box;Front baffle, hinged to the front side wall top of harvesting box;Rear baffle, hinged to the rear side wall top of harvesting box;Reset piece is equipped on the front baffle and rear baffle, and reset piece drives itself to recover vertical state;Connecting rod assembly, its both ends are movably connected on the same end upper portion of front baffle and rear baffle, and connecting rod assembly lower side is equipped with suspension curtain;Shielding component, it is equipped in the top of the side wall opposite to suspension curtain of harvesting box.Using the utility model, front baffle can be under the pressure of external component, rear baffle is pulled forward by connecting rod assembly and is turned over, and then folding is completed;It can return to vertical state under the action of reset piece, and it is convenient to increase the volume of box;Front baffle, rear baffle and reset piece and other components are not easy to scratch and damage, and the service life of device is increased.