44results about How to "Simple structure and miniaturization" patented technology

The invention discloses a tunnel inspection image acquisition device and s tunnel inspection system. The tunnel inspection image acquisition device comprises a plurality of CD cameras, a plurality ofauxiliary light sources, and a fixed bracket, wherein the CD cameras and the auxiliary light sources are fixed on the fixed bracket, and fixing positions of the plurality of CCD cameras are arranged on the same circular ring; in a working state, the center of the circular ring is arranged at the circle center of a tunnel so as to ensure that the distances from the plurality of CCD cameras to a tunnel inner lining are identical, and the overall photographic angle of the plurality of CCD cameras cover the range of the tunnel inner lining. According to the tunnel inspection system, the tunnel inspection image acquisition device is arranged on a flaw detection mobile platform and cooperates with a computer, a display, a synchronous encoder and a data collector to perform synchronous photographing, disease identification, real-time stitching and display of the tunnel. The tunnel inspection image acquisition device and the tunnel inspection system have the technical features of wide detection range, fast detection speed and high timeliness.

An electronic component (10) is provided with an interposer (30) and a laminated ceramic capacitor (20). The interposer (30) has a substrate (31) which is a rectangular parallelepiped having a parallel front surface and back surface. Two first mounting electrodes (311, 312) and two second mounting electrodes (313, 314) are formed at the lengthwise ends of the front surface of the substrate (31). Recesses (310) are formed in the long sides of the insulating substrate (31), and connection conductors (331, 332, 333, 334) are formed on the side walls of the recesses (310). The connection conductors (331, 332, 333, 334) connect a first external-connection electrode (321) and second external-connection electrode (322) formed on the back surface of the substrate (31) to the first mounting electrodes (311, 312) and the second mounting electrodes (313, 314).

A paper money binding machine is composed of a paper money input unit, a separating feeder for separating the paper money from each other and feeding them out, a delivering unit for delivering paper money one by one in their short edge direction, a recognizing unit, a collecting unit for collecting a predefined number of paper money, a moving unit for moving them in their long edge direction, a binding unit for holding the collected paper money and binding them to become bundle, a bundle discharging outlet, a branch delivering unit at downstream of recognizing unit, and a paper money discharging port for the paper money which is not bound.

The invention discloses a ship stern propelling device based on magnetic force transmission. The ship stern propelling device comprises an inner magnetic rotor, an isolating device and an outer magnetic rotor. The inner magnetic rotor comprises a shaft, an inner magnet and a clamp, the inner magnet is mounted on the shaft, and axial and circumferential limiting of the inner magnet are achieved through connection of the clamp and a key correspondingly. The isolating device comprises an isolating sleeve, a front bearing, a rear bearing, a stop catch ring and a pressing ring, the isolating sleeve is fixed to a ship body by bolts through the stop catch ring and the pressing ring, and radial supporting of the shaft end point and the two shaft shoulder points is provided by the front bearing and the rear bearing which are arranged in the isolating sleeve. The outer magnetic rotor is composed of an outer sleeve and an outer magnet, the outer sleeve is connected with an outer power machine, and the outer magnet is embedded to the outer sleeve. According to the ship stern propelling device based on magnetic force transmission, the technical problems that an existing propelling device is low in anti-pressure capacity, low in sealing reliability and limited in arrangement space under the severe using environment are solved.

In the interior of a valve housing (2) equipped with a first flow path (10) and a second flow path (11) connecting a first port (5) and a second port (6) in parallel, there are provided a needle valve body (22), which opens / closes a throttle hole (21) in the first flow path (10), a check valve (13), which opens / closes the second flow path (11), and a piston (28), which controls the opening / closing of the needle valve body (22) through the interaction of the pressure of a fluid introduced into a pressure chamber (38) and the spring force of a compression spring (39). The needle valve body (22) is formed at the tip of a rod (23) attached to the piston (28), and a conduction hole (40) linking the throttle hole (21) and the pressure chamber (38) is formed in the interior of the rod (23) and the needle valve body (22).

A die head has a plunger and metering chambers. Uniform amounts of molten resins are supplied to a die head of an extruder, uniform amounts of the molten resins are discharged from the die head, and the timings of the discharge are uniformly controlled. A main-layer forming flow passage and a core-layer flow passage are formed in a die head. Metering chambers are provided in the main-layer forming flow passage and the core-layer flow passage, and molten resins are forced from the upstream of the flow passages into the main-layer forming passage and the core-layer flow passage by molten resin pumping force. Plungers retracted by the molten resin pumping force and discharging the metered molten resins to the downstream of the flow passage are installed in the metering chambers. The amounts of discharge of the molten resins by the plungers and the timings of the discharge are controlled by a control section for controlling the plunger.

The invention discloses a portable geological disaster monitoring device. A modular GNSS positioning module, a battery, a communication module and a battery manager are installed in the equipment box.An equipment box is detachably fixed to an installation base, the bottom end of the installation base is detachably fixed to a ground drilling pile through a connecting rod, the ground drilling pilecomprises a drilling rod, tilting pieces inclining upwards are arranged on the two sides of the drilling rod, and a nut cap is in threaded connection with the top end of the drilling rod and fixedly connected to the installation base through a connecting rod. In the embodiment of the invention, the structure is simple, lightweight, easy to carry and firm and stable enough. During installation, theground drilling pile is hit into a soil layer, the warped pieces make friction contact with soil, on one hand, the ground drilling pile is prevented from being pulled up, on the other hand, sedimentation can be avoided, the structure is simple, light and easy to carry, and meanwhile firmness and stability are achieved.

The invention discloses a Galilean beam expansion lens device. A positive lens component and a main body component are provided, wherein the positive lens component comprises a convex lens, an adjusting ring and an adjusting bracket, the main body component comprises a concave lens, a mounting base and a locating pin; a concave lens in the positive lens component is arranged in a ring circle of the adjusting ring, the adjusting bracket is an axially symmetrical boss body, a hunching boss center is provided with a vertical cutting slot, and a central position of the adjusting bracket body at the lower part of the vertical cutting slot is provided with a penetration hole for mounting the adjusting ring; frame bodies at left and right sides of the penetration hole are symmetrically provided with a group of fixed through holes used for connecting the adjusting bracket and the main body component; a base body of the mounting base is provided with the through hole concentrically corresponding to the through hole on the adjusting bracket and one group of the fixed through holes, and one group of threaded holes, and the concave lens is mounted in a through hole B on the base body at one side far away from the adjusting bracket; the adjusting bracket is in screw joint with the threaded hole on the mounting base through a group of screw rods arranged in the fixed through holes in stringform, and thus, an adjustable Galilean beam expansion lens framework with overall axial length of 40-60mm is formed.

The invention discloses a large-flow and low-noise miniature air pump. The air pump comprises a shell and a power mechanism mounted on the shell, wherein a first chamber and a second chamber are arranged on the shell, and are each provided with a membrane mechanism and a driving mechanism; the power mechanism is in transmission connection with the driving mechanisms; the power mechanism is used for simultaneously driving the driving mechanism of the first chamber and the driving mechanism of the second chamber to operate; and the driving mechanisms cooperate with the membrane mechanisms for enabling the membrane mechanisms to deform and accordingly realizing the suction or discharging of air. According to the large-flow low-noise miniature air pump provided by the embodiment of the invention, the structure of the air pump is simplified, the size of the air pump is reduced, and the air flow sucking and discharging capability is high.

The invention provides an adjustable and reconfigurable band-pass filter. The adjustable and reconfigurable band-pass filter comprises a substrate, and a first resonance unit, a second resonance unit, a third resonance unit, a fourth resonance unit, an input end and an output end which are arranged on the substrate, wherein the first resonance unit, the second resonance unit, the third resonance unit and the fourth resonance unit have the equal resonance frequencies, and are connected in a coupling manner in sequence; the input end is connected with the first resonance unit in a coupling manner; the output end is connected with the fourth resonance unit in a coupling manner; variable-capacitance circuits are arranged at one ends of the first resonance unit, the second resonance unit, the third resonance unit and the fourth resonance respectively; and switching circuits are arranged at the other ends of the second resonance unit and the third resonance unit respectively. According to the band-pass filter provided by the invention, the adjustable and reconfigurable characteristics of a resonance passband can realized; and in addition, the band-pass filter is simple to operate and convenient to use.

The invention discloses an independent controllable intake-exhaust two-stroke (capable of being changed into four-stroke) internal-combustion engine system which is used for solving the defects including low fuel efficiency, large emission pollution, participation of engine oil in combustion and the like of a two-stroke internal-combustion engine by applying the independent controllable intake-exhaust system, so that the energy is saved, the emission is reduced, the pressurized working conditions of the two-stroke internal-combustion engine are realized, the defect that the power per liter of a four-stroke internal-combustion engine is lower than that of the two-stroke engine is solved, and a completely new function of freely converting between the two strokes and the four strokes in one internal-combustion engine is creatively realized. Moreover, the independent controllable intake-exhaust two-stroke internal-combustion engine system is simpler in structure, lighter, provided with theoretical maximum power which is twice that of the conventional four-stroke pressurizing internal-combustion engine, integrated with the advantages of the two-stroke internal-combustion engine and the four-stroke internal-combustion engine and capable of making up the defects of the two-stroke internal-combustion engine and the four-stroke internal-combustion engine, and therefore, the independent controllable inlet-exhaust two-stroke internal-combustion engine system is an internal-combustion engine system with a completely new principle and a completely new manufacturing method, and a novel power choice is provided for the vehicle industry and other equipment manufacturing industries.

The invention discloses a hydraulic stop valve and an application method. The hydraulic stop valve comprises a valve body, a valve element, a base and a steering engine; the valve body is provided with a transverse liquid channel and a longitudinal valve element cavity; the valve element is embedded in the valve element cavity of the valve body; a transverse through hole for enabling liquid to circulate is formed in the middle part of the valve element body; the valve element body is provided with an annular guide groove, a longitudinal guide groove and a communicating balance groove; a projected eccentric positioning block is arranged at the bottom of the valve element body, and is matched with the base; the steering engine is fixed on the valve body; an output shaft of the steering engine is connected with a valve element shaft at the upper end of the valve element through a transmission gear; the hydraulic stop valve is connected to a liquid pipeline; the steering engine is connected with a remote control system; and the remote control system controls the rotating speed and the rotating angle of the steering engine through electric signals.

The invention discloses an RFID electronic control lock. The RFID electronic control lock comprises a lock cylinder and a rotary knob, wherein the rotary knob is connected to the lock cylinder for driving the lock cylinder to rotate; an RFID control module and a password control module connected to a CPU independently control a locking device to control whether the lock cylinder can rotate. According to the RFID electronic control lock, the password unlocking function and the RFID unlocking function are integrated, circuits are simple, the operation is convenient, the functions are diverse, the operating functions are convenient to use, the structure is simple and the size is small.

The invention discloses a projection optical system, wherein a first lens group is used for focusing, a second lens group, a third lens group and a fourth lens group are used for zooming, and a diaphragm is located between the third lens group and the fourth lens group. At least one surface of a first lens of the first lens group is an aspheric surface. The field angle of the optical system can be improved, and off-axis aberration and distortion can be well corrected. At least one surface of a fifth lens in the fourth lens group is an aspheric surface, and an aspheric lens is configured behind a diaphragm, so that the aberration of the optical system can be well corrected, and the MTF performance is improved. The projection optical system can meet the requirements of large aperture, simple and miniaturized structure and low cost by optimally designing the number of the lenses of each lens group, the surface shape of each lens and various optical parameters of the lenses, and can effectively improve the aberration of the system and suppress the distortion of the system.

The invention discloses a hydraulic pressure engine based on a reversing valve. The hydraulic pressure engine comprises the reversing valve, an engine body, a transmission assembly, a water inlet pipe, a water draining pipe and a communicating pipe; the reversing valve comprises a shell and a valve core; the valve core is rotatably mounted in an inner cavity of the shell in a sealing mode, and thevalve core makes the reversing valve switch between the two states of water inlet and water draining through rotating; the engine body comprises a cylinder body, a piston, a connecting rod and a crankshaft; the transmission assembly is used for transmitting power from the crankshaft of the engine body to the valve core of the reversing valve; the water inlet pipe communicates with a water inlet of the reversing valve; the water draining pipe communicates with a water outlet B of the reversing valve; and one end of the communicating pipe communicates with a water outlet A and a water return port of the reversing valve, and the other end of the communicating pipe communicates with a water port of the engine body. According to the hydraulic pressure engine based on the reversing valve, kinetic energy of water is converted into mechanical energy, the structure of the hydraulic engine is simple and small, power output is stable and reliable, the energy conversion efficiency is high, and the hydraulic engine can be used for being connected to other power devices for doing work.

The invention provides a grinding robot. The grinding robot comprises a support, a tool driving module, a grinding tool, a jig driving module and a grinding jig, wherein the tool driving module comprises a first mechanical arm assembly, a second mechanical arm assembly and a third mechanical arm assembly, the first mechanical arm assembly and the third mechanical arm assembly are arranged on the support, the second mechanical arm assembly is arranged between the first mechanical arm assembly and the third mechanical arm assembly, the first mechanical arm assembly, the second mechanical arm assembly and the third mechanical arm assembly rotate along an axis of the first mechanical arm assembly, an axis of the second mechanical arm assembly and an axis of the third mechanical arm assembly correspondingly, the second mechanical arm assembly is provided with the grinding tool, the jig driving module comprises a linear motion assembly and a rotating motion assembly, the linear motion assembly is arranged on the support, the rotating motion assembly is arranged on the linear motion assembly, the linear motion assembly and the rotating motion assembly move along the axis of the linear motion assembly and the axis of the rotating motion assembly correspondingly, and the rotating motion assembly is provided with the grinding jig. The grinding robot is high in flexibility and good in rigidity.

The invention relates to the technical field of input equipment of a computer, in particular to input equipment with double navigation keys. The miniaturized input equipment with the double navigation keys is simple in structure and facilitates single-finger operation. The input equipment comprises a base as well as a first navigation key and a second navigation key which are arranged on the base and can be operated with a single finger. Operation in at least five directions can be realized on each of the first navigation key and the second navigation key. According to the input equipment with the double navigation keys, main functions of a standard computer keyboard can be realized, the input equipment can be integrated to other equipment or used separately, and the input equipment can be connected with a host in a wiring manner or a wireless manner when used separately and is used for replacing the standard keyboard.

The invention relates to the field of optical filters, in particular to a flat-topped optical filter which comprises an optical fiber input terminal, an optical fiber output terminal, an optical fiberpath, an optical variability lens and a shell, wherein the optical fiber path is arranged between the optical fiber input terminal and the optical fiber output terminal, and the optical variability lens is arranged in the optical fiber path. The optical fiber path comprises an alignment lens, an optical grating and a wavelength tuning module, an optical path is divided into two paths by the optical variability lens to form two Gaussian beams with different central wavelengths, the two Gaussian beams are overlaid by a processing module to form a flat-topped beam, the alignment lens, a transmission grating, the wavelength tuning module and the optical variability lens are arranged in a cavity of the shell, a tunable flat-topped filter wave is achieved, and the optical filter is simple in structure and small in size.

The invention discloses a crane for installing and maintaining a wind driven generator, and particularly relates to the crane for installing and maintaining the wind driven generator. The crane comprises a suspension arm, a pivotal bearing and a crane lifting base, the suspension arm is installed on the crane lifting base through the pivotal bearing, the crane lifting base is of a multi-section lifting structure, and the crane is structurally characterized by further comprising a plurality of sets of electromagnet attraction devices which are fixedly installed on the side face position of thecrane lifting base; and each set of electromagnet adsorption device comprises a plurality of electromagnet adsorption units, the electromagnet adsorption units are sequentially connected with a telescopic hydraulic cylinder through hinges, and the inner walls of the electromagnet adsorption units are in a circular arc shape and provided with electromagnets. The crane for installing and maintainingthe wind driven generator has the advantages of being simple in structure, high in maneuverability and capable of reducing the installation and maintenance cost of the wind driven generator.

The invention provides an adjustable and reconfigurable band-pass filter. The adjustable and reconfigurable band-pass filter comprises a substrate, and a first resonance unit, a second resonance unit, a third resonance unit, a fourth resonance unit, an input end and an output end which are arranged on the substrate, wherein the first resonance unit, the second resonance unit, the third resonance unit and the fourth resonance unit have the equal resonance frequencies, and are connected in a coupling manner in sequence; the input end is connected with the first resonance unit in a coupling manner; the output end is connected with the fourth resonance unit in a coupling manner; variable-capacitance circuits are arranged at one ends of the first resonance unit, the second resonance unit, the third resonance unit and the fourth resonance respectively; and switching circuits are arranged at the other ends of the second resonance unit and the third resonance unit respectively. According to the band-pass filter provided by the invention, the adjustable and reconfigurable characteristics of a resonance passband can realized; and in addition, the band-pass filter is simple to operate and convenient to use.

The invention discloses a multispectral stem cell activity detection and analysis system based on a hollow-core optical fiber. The system comprises a cell container used for placing stem cells to be detected. a hollow-core optical fiber stretches into the cell container, and an optical fiber connected with an objective lens of a Raman spectrum device is connected with the hollow-core optical fiber through an optical fiber coupling part; the Raman spectrum device is connected with a computer for analyzing the activity of the stem cells; a light irradiation device for irradiating the stem cells to be detected in the hollow-core optical fiber and exciting Raman scattering is additionally arranged; and the inner surface of the hollow-core optical fiber adsorbs enhanced substrate nanoparticles for enhancing a Raman detection signal. The system can greatly improve the detection efficiency of stem cell activity, does not need fluorescent staining, is non-toxic to cells, has the advantages of low cost, rapidness and simplicity, and has good application prospects in the fields of disease treatment, artificial reproduction, organ transplantation and beauty.

The invention discloses a portable geological disaster monitoring device. A modular GNSS positioning module, a battery, a communication module and a battery manager are installed in an equipment box, and the equipment box is detachably fixed on a mounting base, and the bottom end of the mounting base is passed through a connecting rod. It is detachably fixed to the ground-drilling pile, and the ground-drilling pile includes a drill pipe. The two sides of the drill pipe are provided with inclined upward warps. In the middle, the structure is simple, lightweight and easy to carry, and at the same time it is solid and stable enough; when installing, the ground-boring piles are driven into the soil layer, and the warp pieces are in frictional contact with the soil. On the one hand, the ground-boring piles are prevented from being pulled up, and on the other hand, settlement , the structure is simple and lightweight, easy to carry, and at the same time strong enough and stable.

The invention discloses a self-powered sensor for monitoring flow rate of pipeline flow based on vortex-induced vibration. The self-powered sensor is characterized in that an inner cylinder is arranged at the inner wall of a pipeline of an outer cylinder, and leading line sealing plugs are arranged in the side wall of the pipeline of the outer cylinder; a bluff body, a sensor and an energy capturing unit are arranged in the inner cylinder; a vibration power generation sheet is clamped and fixed into the inner cylinder by a clamp assembly, and the end of the vibration power generation sheet isstuck onto an induced vibration board; mass blocks are vertically and symmetrically adhered to both sides of the induced vibration board; positive and negative leading lines of the vibration power generation sheet penetrate through the wall of the outer cylinder through the leading line sealing plugs, and are connected with an external circuit assembly. The self-powered sensor has the advantages that no external power source is needed, the online measuring on flow rate and the energy supply for a flow rate signal wireless transmission unit can be simultaneously realized under the action of fluid and solid coupling, and the online measuring on the flow rate in the pipeline is truly realized; by adjusting the self inherent frequency and the distance relative to the bluff body, the power supply capacity is increased, the structure is simple and miniature, the selection range of power generation functional materials is broad, the compatibility and extendability in the pipeline are strong,and the array layout and multi-point layout in the pipeline can be easily realized.

The invention relates to a case and cabinet dehumidifying circular dryer which comprises a shell, a fan and an electronic refrigerator, wherein the fan and the electronic refrigerator are installed in the shell, an inverse power supply case (2) is arranged above the shell, and the shell is also provided with a condensation chamber (4), a hot end of the electronic refrigerator (7) is connected with a heat absorption piece (10), a cold absorption piece (6) connected with a cold end of the electronic refrigerator (7) is arranged in the condensation chamber (4), a sealed shell (15) adapted to the heat absorption piece (10) is installed on the heat absorption piece (10), the fan (12) is mounted on one surface of the sealed shell (15), an air opening of the fan faces the heat absorption piece (10), a first humid air inlet (11) is also arranged on the shell, and a control board (16) for controlling the air input of a second humid air inlet (3) is arranged below the first humid air inlet (11). The invention can radically solve the moisture prevention and dehumidification problems in a case and a cabinet and has the advantages of no noise, no vibration, no pollution, simple and miniaturized structure, lower cost, durability, reliability, convenient installation and maintenance and the like.

The invention discloses a fast protein extraction leakage-proof stirrer which comprises a motor, a motor fixing base, a stirring component, a sealing component, a stirring fixing base, a stirring tank, a protein collecting pipe, a breathing pipe, a feeding pipe and a discharging pipe; the upper end of the motor is connected with the lower end of the motor fixing base through a flange and a bolt; the motor fixing base is fixedly connected with the stirring fixing base through the bolt; the upper end of the stirring fixing base is connected with a top flange of the stirring tank through a stud so as to seal, compress and fix the stirring tank; the protein collecting pipe is arranged on an outer wall of the stirring tank close to the lower part; the breathing pipe and the feeding pipe are arranged at the top end of the stirring tank; the sealing component comprises dual sealing of an elastic sealing element and a mechanical sealing element and adopts a temperature heating control component. The stirrer has a simple structure and a good sealing effect and is suitable for the research and development of research institutions and hospital research and development departments.

The invention relates to a solid tire filling device, which comprises a tire clamping tool, a tire rotator, a foam filler injecting mechanical arm system, a foam material generating system and a control system integrated in sequence, and the tire clamping tool includes a first base , a swing rod bracket assembly rotatably arranged on the first base, and a wheel shaft fixing claw assembly movably arranged on the swing rod bracket assembly, the tire rotator includes a second base, a The drive assembly and the friction wheel assembly are arranged on the second base. The foam filler injecting mechanical arm system includes a third base and a mechanical arm assembly movably arranged on the third base. Compared with the prior art, the invention realizes the environmental protection reuse of tires with air leakage but in good wear state or that have been used for a long time, which can meet the processing and production needs of families or street stores.

The invention discloses a card swiping electronic coded lock. The card swiping electronic coded lock comprises a control panel, an impact plate and a lock head; the control panel is mounted on the impact plate; the control panel includes a card swiping area and a power supply, and is provided with a control circuit inside; and the lock head and the control panel are connected, and are mounted on the impact plate side by side. The card swiping electronic coded lock is characterized in that the control circuit includes a CPU and a RFID control module; an electromagnetic valve and an electromagnetic valve actuation circuit are arranged in the lock head; the power supply is respectively connected with the control circuit and the electromagnetic valve through leads for supplying electricity to the same; and the power supply is a dry cell. The card swiping electronic coded lock has the advantages of: simple circuit, convenience to operate, simple and small structure, long life, and convenience to reset a password when forgetting the password.

The invention discloses a large-flow and low-noise miniature air pump. The air pump comprises a shell and a power mechanism mounted on the shell, wherein a first chamber and a second chamber are arranged on the shell, and are each provided with a membrane mechanism and a driving mechanism; the power mechanism is in transmission connection with the driving mechanisms; the power mechanism is used for simultaneously driving the driving mechanism of the first chamber and the driving mechanism of the second chamber to operate; and the driving mechanisms cooperate with the membrane mechanisms for enabling the membrane mechanisms to deform and accordingly realizing the suction or discharging of air. According to the large-flow low-noise miniature air pump provided by the embodiment of the invention, the structure of the air pump is simplified, the size of the air pump is reduced, and the air flow sucking and discharging capability is high.

The invention provides a locking device, a through channel and a rail vehicle. The locking device comprises a guide sliding groove. Each of the plurality of locking parts comprises a fixed locking unit and a movable locking unit; the movable locking unit is movably arranged on the guide sliding groove; the linkage rope is connected with the plurality of movable locking units; the linkage rope is suitable for driving the movable locking unit to move, so that the movable locking unit is matched with and separated from the fixed locking unit; when the movable locking unit is matched with the fixed locking unit, the movable locking unit and the fixed locking unit are locked in the extending direction of the through channel. The locking device provided by the invention can be used for quickly locking and unlocking the through channel, can also be used for the through channel with a special-shaped outline, and has a relatively large application range.

The invention discloses an RFID electronic control lock. The RFID electronic control lock comprises a lock cylinder and a rotary knob, wherein the rotary knob is connected to the lock cylinder for driving the lock cylinder to rotate; an RFID control module and a password control module connected to a CPU independently control a locking device to control whether the lock cylinder can rotate. According to the RFID electronic control lock, the password unlocking function and the RFID unlocking function are integrated, circuits are simple, the operation is convenient, the functions are diverse, the operating functions are convenient to use, the structure is simple and the size is small.