121results about How to "Excellent anti-vibration performance" patented technology

The present invention belongs to the field of building material, and is especially one kind of no-shrinkage grouting filler with adjustable performance. The no-shrinkage grouting filler is hydraulic mixture comprising Portland cement and fly ash or silica fume as cementing material, quartzite, water reducing agent, expanding agent, water loss reducing agent, early settling preventing agent and early contract preventing agent. It has high flowability, no settling, no weeping, micro plastic expansion, no shrinkage, no cracking, adjustable performance, and no plastic settling and other excellent performance, and may be applied widely in installing large precise equipment, large area leveling, emergency repair engineering, etc.

The invention discloses a spherical support girder turning mechanism for open-type hard-rock boring machines, which is applied to the field of full-face hard-rock tunnel boring machines. The spherical support girder turning mechanism comprises a cutterhead, a shield, a thrust cylinder, a girder, torque cylinders, an articulated ball gland and horizontal support cylinders and the like, wherein the cutterhead, the shield and the girder of the full-face hard-rock tunnel boring machine are connected into a whole through bolts, the girder and a saddle are assembled together through a box structure with a guide slideway, the two ends of the thrust cylinder are respectively articulated on the girder and a bracing shoe, the four corners of the girder and the saddle are respectively provided with a guide slideway, the saddle is connected with the horizontal support cylinders through the torque cylinders on both sides of the saddle, a central pin shaft is arranged in an articulated ball, the two ends of the central pin shaft are fixed on upper and lower plates of the saddle, and a central block is fastened with the two horizontal support cylinders through a bolt. The most striking design characteristic of the invention focuses on the central pin shaft and the articulated ball; and the spherical support girder turning mechanism disclosed by the invention is easy to operate, safe and reliable, good in vibration-resistant effect and uneasy to damage.

In a battery module of the invention, a first battery row and a second battery row have the same number of cylindrical batteries (2) arranged side by side, and both ends in the battery axis direction of each of the battery rows are held by holding frames (3). Each holding frame (3) is formed in a rectangular solid where an inner frame (4) and two outer frames (7, 8) are separably connected to each other. In each holding frame (3), semicircular arc-shaped cutout-like holding receiving sections (4a, 7b, 8b) of the same number as the number of the batteries in the battery rows are formed in bothsides of the inner frame (4) and in those sides of the two outer frames (7, 8) which face the inner frame (4), and half sections of the cylindrical batteries (2) are fitted in the holding receiving sections (4a, 7b, 8b). Two adjacent cylindrical batteries (2) are electrically connected via an inter-battery connection plate (9).

The invention provides a photoelectric control valve of an aerostat. The photoelectric control valve of the aerostat comprises a valve cover, a seal ring, multiple columns, a base, a control circuit, a valve body, an opening-closing mechanism portion and a limiting mechanism portion, wherein the valve body is arranged on a bag body of the aerostat. The multiple columns are respectively located between the base and the valve body to enable the base and the valve body to be connected. The valve body is provided with a valve port and used for air in an air bag in the aerostat to be discharged out. An outer circle of the valve port is sleeved in an inner hole of the seal ring, and the valve cover covers the seal ring and the valve port and is in a sealed state. A flange structure of the lower end face of a lead screw of the opening-closing mechanism portion is fixed to the valve cover, and the lead screw is used for opening and closing the valve cover and enabling the valve cover to be away from and cover the valve port. A motor of the opening-closing mechanism portion is connected with the control circuit and controls lifting and downward moving of the valve cover in the vertical direction. The lead screw is provided with a threaded hole, a stopping block of the limiting mechanism portion is fixed to the lead screw through the threaded hole, and the stopping block vertically moves with the lead screw to block infrared light emitted by an upper limiting optical coupling assembly and a lower limiting optical coupling assembly of the limiting mechanism portion and cut off the control circuit and accordingly enables the motor to stopping running.

The invention discloses a quick-blind-mating floating-type-mounted RF coaxial connector and a connecting method thereof. The RF coaxial connector comprises a socket and a plug. The socket comprises an inner conductor jack, an insulator, a socket outer conductor, a floating sleeve, a spring and a mounting panel. The plug comprises a plug outer conductor, an inner conductor inserting pin, an elastic collar and a mounting board. The elastic collar is connected with an engaging trough in an adapted engaging manner. The inner hole linear section of the socket is in insertion fit with the outer cycle linear segment of the plug. According to the RF coaxial connector, on the condition that the plug is inserted into the socket, two reference surfaces are superposed, thereby forming a theoretical zero clearance and ensuring continuity of capacitance. Furthermore a specific engagement structure is utilized, thereby eliminating radial clearance and preventing axial endplay clearance in a stationary state in insertion. Furthermore the quick-blind-mating floating-type-mounted RF coaxial connector and the connecting method have advantages of small size, compact structure, low reflection coefficient, low voltage standing wave, full-band linear voltage standing-wave ratio, excellent shielding efficiency, etc.

The invention belongs to the technical field of adhesives and relates to a polyether-type urethane acrylate UV-cured adhesive and a preparation method thereof. The polyether-type urethane acrylate UV-cured adhesive comprises, by weight, 20-70 parts of polyether-type urethane acrylate, 10-40 parts of auxiliary resin, 5-20 parts of ethylene-acrylate rubber, 5-40 parts of an acrylate monomer, 5-35 parts of isobornyl acrylate, 1-7 parts of a photoinitiator, 1-5 parts of fumed silica and 0.5-2 parts of a silane coupling agent. Through use of the polyether-type urethane acrylate, auxiliary resin, ethylene-acrylate rubber and acrylate monomer, the polyether-type urethane acrylate UV-cured adhesive has excellent long-term high temperature resistance, low temperature resistance, high temperature and high humidity resistance, excellent shock resistance and a low cost and can be prepared by simple processes.

The invention provides a high-uniformity damping rotating nozzle, and belongs to the technical field of irrigation nozzles. The high-uniformity damping rotating nozzle comprises a nozzle outer shell, a rotating assembly and a water spraying assembly, wherein the rotating assembly and the water spraying assembly are arranged in the nozzle outer shell. The water spraying assembly comprises a guide plate, a spraying plate and a water scattering plate assembly, wherein the guide plate, the spraying plate and the water scattering plate assembly are communicated in sequence. After water passes through an arc passageway on the spraying plate, the spraying plate rotates, water scattering needles on the water scattering plate can block part of water flow sprayed out of the spraying plate, and then water can be scattered within the far and near range of the nozzle. The high-uniformity damping rotating nozzle has the advantages that cleaning and maintenance are convenient, and reliability is high; the rotating speed is stable, extremely-high vibration prevention capacity and wind resistance are achieved, the phenomena that when an existing nozzle conducts spraying, an installed vertical rod shakes and water drops are splashed from the vertical rod of the nozzle are avoided, the irrigation uniformity is higher, and the atomization effect is good during high-pressure spraying; the range is wide, starting pressure is low, and the requirements for different irrigation ranges and different irrigation flow rates can be met; cost is lower, performance is reliable, the service life is long, and the nozzle not only can be applied to the fixed spray irrigation aspect, but also can be applied to the movable spray irrigation aspect.

The invention provides a high-temperature-resistant dual-component polyurethane adhesive for an air filter and a preparation method of the high-temperature-resistant dual-component polyurethane adhesive. Modified castor oil polyhydric alcohol and an organic silicon compound are introduced into the formula of the high-temperature-resistant dual-component polyurethane adhesive. The preparation method is simple in process, easy to operate and relatively low in cost; the adhesive is excellent in adhesiveness to a glass fiber filter element and a stainless steel rim of the air filter, high in vibration resistance and high in damp heat resistance.

The invention discloses a gum dipping device and a method for improving the performance of an optical fiber coil. According to the method for improving the performance of the optical fiber coil, a wound optical fiber coil is wholly dipped into an adhesive, the gum dipping process that vacuum-pumping is carried out firstly to remove air inside the coil, and then pressurizing is carried out to uniformly press the adhesive in the optical fiber coil is adopted, the optical fiber coil is taken out after dipping, the redundant adhesive on the surface of the optical fiber coil is cleaned up, and stepped curing treatment and stress release treatment are carried to enable the optical fiber coil to be fully cured and the stress of the optical fiber coil to be fully released, so that a cured optic fiber gyroscope with excellent temperature performance and vibration resistance is obtained. After being cured through the curing method provided by the invention, the optical fiber coil is adhered and fixed into a whole through the adhesive uniformly distributed inside the optical fiber coil , so that the local deformation and strain of the optical fiber at the environment that temperature changes and vibration exists can be effectively reduced, the temperature stability and vibration resistance stability are effectively improved, and the application requirement of high precision on the optic fiber gyroscope fields can be met.

The invention relates to a numerical control gantry milling machine of a fixed beam, comprising a machine body, wherein a work table which can extend along the direction of the machine body is arranged on the machine body, vertical columns are respectively arranged at the two sides of the machine body, and the top ends of the vertical columns are connected with a cross beam. The innovation of the numerical control gantry milling machine is that the front side and the rear side of the cross beam are respectively provided with a milling sliding seat and a grinding sliding seat, and the milling sliding seat and the grinding sliding seat are provided with corresponding components and can be used for milling and grinding the workpieces on the work table after being installed and clamped for one time, so that the time for assembling, detaching and positioning the workpieces can be reduced, the process efficiency and the process precision can be improved, and the utilization rate of the equipment can be improved. The cross beam has a roller guide rail structure which is distributed in a stepped shape, so that the roller guide rail has enough flexural stiffness and torsional stiffness, and long enough precision retaining ability. The weights of a ram and a main gear box are balanced through a hydraulic balance oil box, so that the no-load twisting moment of a bead screw shaft can be reduced, the attrition of the bead screw shaft can be reduced, and the precision stability of the bead screw shaft can be kept.

A modulation-free frequency stabilizer of an external cavity semiconductor laser consists of a single frequency narrow-linewidth external-cavity semiconductor laser, a Faraday isolator, a first half-wave plate, a polarization beam splitter, a Sagnac ring, a differential detection circuit consisting of two photoelectric diode detectors, a subtraction circuit, a proportional-integral-differential processing circuit and a switch. The modulation-free frequency stabilizer has the advantages of simple structure, good frequency stabilization effect, low cost and the like.

The invention relates to a regulatable Hall effect sensor which is used for distance detection, speed detection, angle detection and rotating speed detection, and is particularly applied to the fields of automotive cam and crankshaft speed / position detection, speedometers used in automobiles and industries, and the like. The regulatable Hall effect sensor comprises a lead wire set, a printed-circuit board and a Hall element, wherein, the lead wire set and the Hall element are respectively fixed on the printed-circuit board, and also are provided with magnetic steel sleeves and magnetic steel; the magnetic steel is arranged in the magnetic steel sleeve, is made of permanent magnet materials, and is provided with external screw threads; the magnetic steel sleeve is made of nonmagnetic materials, and is provided with internal screw threads; the external screw threads are matched with the internal screw threads; the magnetic steel sleeve is fixedly connected on the printed-circuit board; and the lower bottom surface of the magnetic steel sleeve is connected with the Hall element.

The present invention discloses a fan chip-free heat radiating device used in particular applicable to an industrial field with serious dust, pollution or vibration The present invention is characterized in that the present invention directly adopts a machine box with a metal fin as a heating radiating body, and takes a heat conducting rubber block corresponding to a chip that needs to radiate as a heat conductor, and is firmly connected with a heat conducting rubber hot end though a groove in the machine box, the cold end of the heat conducting rubber is closely touched with the chip that needs to radiate through a refrigeration chip, the heat radiation performed or the accurate temperature control performed to more chips is simultaneously realized, the polluted environment of the dust and the oil fume can be completely separated, simultaneously, a clamping and fixing function to the chip is provided. The heat radiating efficiency and the freedom from vibration of the present invention is better, the accurate temperature control can be performed, and the structure is simple, stable and reliable, the noise interference is free, the present invention can be widely applied to various electronic and electric equipments and products, in particular to an industrial field with serious dust, pollution or vibration and in particular to electronic and electric equipments and products of a quiet occasion.

The invention discloses a common-path radial cutting liquid crystal phase shift interference wave-front sensor. The common-path radial cutting liquid crystal phase shift interference wave-front sensor is composed of a polarizer, a radial cutting system, an LC (Liquid Crystal Phase Modulator), a polarization analyzer, an imaging system and a computer. After a light beam to be detected enters into the wave-front sensor, the polarizer can be rotated, and the polarization direction of the incident light beam can be adjusted; then, two bundles of cutting light beams are formed after the incident light beam passes through the radial cutting system, the two bundles of the cutting light beams share the same light axis, the polarization directions of the two bundles of the cutting light beams are orthogonal, and the apertures of the two bundles of the cutting light beams are zoomed according to the same proportion; the two bundles of the cutting light beams can be directly irradiated to the LC, and the polarization directions of the LC and the enlarged light beams are kept the same; the computer drives the LC to introduce into N (N is larger than or equal to 3) different phase shifts between the cutting light beams, a polarized component, of which the polarization direction is consistent with that of the polarization analyzer, is obtained in the two bundles of the cutting light beams after passing through the polarization analyzer, and interference is generated; interference images are collected by the imaging system and are sequentially input into the computer in a time-division way, and the wave-front phase of the light beam to be detected can be reconstructed by analyzing and calculating. The common-path radial cutting liquid crystal phase shift interference wave-front sensor disclosed by the invention has the advantages that the structure of an optical system is simple, the impact of environmental vibration and non-common-path error can be restrained, the visibility of interference fringes is continuous and adjustable, and the wave-front detection accuracy is high.

The organic polymer as electromagnetic shielding material and its preparation process belongs to the field of material science and technology. The organic polymer as electromagnetic shielding material has organic polymer of polymerization degree n of 20-400 in the shown structure as the main component. It is prepared with the monomer with aniline and ferrocene as main material, and through slowly dropping oxidant solution into the monomer solution to polymerize and adding proper amount of dopant. The polymer has in its molecular structure polyaniline as the conducting mother substance and ferrocene as the magnetic radical, so that it has both electric conductivity and magnetism. It has high comprehensive shielding effect, low density, wide applicable frequency range, low temperature coefficient, low magnetic loss and other excellent characteristics, and may find wide application in electromagnetic shielding, wave absorption, etc.

The invention discloses a detachable large-current connector which comprises a socket and a plug. The socket is composed of a socket insulation body, a socket cover plate, large-current jacks, a small-current contact pin, a screw and a sealing ring. The plug is composed of a plug insulation body, a plug cover plate, a large-current contact pin, a small-current contact pin, a screw and a sealing ring. The number of the large-current jacks is three, and the large-current contact jacks are all formed in the socket cover plate. The socket cover plate, the large-current jacks and the small-current contact pin are arranged in the socket insulation body, the sealing ring is arranged between the large-current jacks and the socket insulation body, and the screw enables the socket insulation body and the socket cover plate to be fixedly connected. The plug is plugged with the socket. According to the detachable large-current connector, the connecting structure of the large-current jacks or pins, the socket insulation body and the socket cover plate is changed, so that the detachable large-current connector is convenient to detach, guarantees the good electrical performance of products, and has the advantages of being simple in structure, low in manufacturing cost, good in anti-vibration effect, and convenient to maintain and mount.

The invention relates to the field of foam, in particular to polyurethane foam with good heat preservation performance and a preparation method of the polyurethane foam. The invention firstly providesthe polyurethane foam with good thermal insulation property. The polyurethane foam is prepared from the following raw materials in parts by weight: 30-70 parts of polyester polyol, 15-35 parts of polyether polyol, 10-25 parts of aerogel, 5-10 parts of a foaming agent, 0.5-2 parts of a foam stabilizer, 0.5-1 part of a catalyst, 0.75-1.6 parts of water and 65-75 parts of polyisocyanate; wherein theaerogel comprises silicon dioxide aerogel and aluminum oxide / silicon dioxide aerogel. The raw material part of the polyurethane foam provided by the invention adopts renewable resources, so that thepolyurethane foam is safe and environment-friendly. The polyurethane foam has excellent elasticity, heat insulation performance, heat resistance, water resistance and mechanical strength, has sound absorption and damping effects, has excellent vibration resistance, can be used under various environmental conditions, and widens the application range.

The invention discloses a mass spectrometer experiment table with shockproof and noise-reduction functions. The mass spectrometer experiment table comprises a stainless steel table top, a stainless steel support and a mechanical pump storage room, wherein the stainless steel support supports the stainless steel table top, and the mechanical pump storage room is positioned at the lower part of the stainless steel bench top; a bottom wall is arranged at the mechanical pump storage room, a rubber blanket is arranged at the upper part of the bottom wall, and the inner part of the rubber blanket is lined with a wavy sponge; the thickness of the stainless steel table top is more than 16 mm. In the working process of a mass spectrometer, the mass spectrometer is placed on the stainless steel table top, and the stainless steel table top with the thickness of more than 16 mm has sufficient rigidity; a mechanical pump used for providing a vacuum degree is placed in the mechanical pump storage room; as the rubber blanket is arranged on the bottom wall of the mechanical pump storage room and the inner part of the rubber blanket is lined with the wavy sponge, the influence of the vibration of the mechanical pump on the mass spectrometer can be minimized, the harm to operators caused by high-decibel noise caused by vibration are reduced, the instrument maintenance is convenient, and meanwhile the analytical sensitivity and accuracy of the mass spectrometer can be ensured.

The invention discloses a pressure reducing valve for high-pressure gas. The pressure reducing valve for the high-pressure gas comprises a valve body, and a cover which is arranged on the valve body, wherein the valve body is provided with an inner chamber, an outer chamber, a gas inlet and two gas outlets; the gas inlet communicates with the inner chamber, and the two gas outlets communicate with the outer chamber; a spring is arranged in the cover; a piston rod is arranged in the outer chamber; one end of the spring is propped to the inner wall of the cover through an upper spring seat, and the other end of the spring is propped to the piston through a lower spring seat and a plurality of adjusting cushions; the piston is pressed to an opening of the outer chamber through the spring; a first sealing ring is arranged between the piston and the inner wall of the valve body; the outer chamber is separated from the inner part of the cover through the piston and a first sealing ring; a ventilating hole is formed in the top part of the cover, and the inner part of the cover communicates with outside air through the ventilating hole; the piston is provided with an air flowing channel through which the outer chamber communicates with the inner chamber; a valve element is arranged in the air flowing channel; a gap is formed between the valve element and the air flowing channel. According to the pressure reducing valve for the high-pressure gas, all performance parameters of the pressure reducing valve are applicable to the pressure reduction of pipelines of a hydrogen fuel cell motor vehicle.

The invention provides a method for inhibiting accidental radiation emission of satellite cabin passing cables. The method for inhibiting accidental radiation emission of the satellite cabin passing cables comprises the steps of bandaging of a low frequency cabin passing cable, bandaging of a high frequency cabin passing cable and bandaging of cable cabin passing openings. Through the method, the cables and the cable cabin passing openings are bandaged without changing the structure and the moving direction of the satellite cables, influence on cable temperature is small, anti-vibration effect is good, and shielding effect is good.

The present invention belongs to the field of building material, and is especially one kind of no-shrinkage grouting filler with adjustable performance. The no-shrinkage grouting filler is hydraulic mixture comprising Portland cement and fly ash or silica fume as cementing material, quartzite, water reducing agent, expanding agent, water loss reducing agent, early settling preventing agent and early contract preventing agent. It has high flowability, no settling, no weeping, micro plastic expansion, no shrinkage, no cracking, adjustable performance, and no plastic settling and other excellent performance, and may be applied widely in installing large precise equipment, large area leveling, emergency repair engineering, etc.

The invention discloses an anti-seismic supporting hanger based on belleville spring vibration reduction. The anti-seismic supporting hanger comprises a horizontal rod, a vertical rod and an anti-seismic diagonal rod. The diagonal support rod is hinged to the left end of the horizontal support rod, and the vertical support rod is connected to the left end of the horizontal support rod through a bolt; the upper ends of the anti-seismic diagonal rod and the vertical rod are connected with a structural layer; a belleville spring vibration reduction assembly is mounted at the lower end of the anti-seismic diagonal rod and comprises a half-thread positioning rod and a belleville spring; and a smooth section is arranged in the middle of the half-thread positioning rod, and thread sections are arranged at the two ends of the half-thread positioning rod. According to the anti-seismic supporting hanger, the belleville spring vibration reduction assemblies are mounted at the lower ends of the anti-seismic diagonal rod and the vertical rod, and thus the capabilities of seismic resistance, vibration reduction and reinforcing of the supporting hanger are achieved; the anti-seismic supporting hanger is simple in structure, easy to produce, flexible in demounting and mounting, convenient to maintain, capable of reducing the cost greatly and good in durability, and can be applied to the severeservice environment; and the travel is short, the load is large, the mounting space can be saved, and the efficiency is improved.

A beam scanning device includes a light source to emit a light beam, an optical deflector to deflect the light beam, an optical system including a fθ lens to guide the defected light beam to a scan surface to form an image thereon, a synchronization detecting sensor to detect the deflected light beam outside an area of the image, a light blocking member configured to block the deflected light beam on an exit side of said fθ lens outside an effective scan area that includes the area of the image and also includes an optical path extending to said synchronization detecting sensor, and a metal housing accommodating said light source, said optical deflector, said optical system, said light blocking member, and said synchronization detecting sensor.

An insulating plate of a nonaqueous electrolyte secondary cell is interposed between a cell element and a cover member in a nonaqueous electrolyte secondary cell including the cell element formed by stacking cathodes and anodes through separators, a cell can including a can body which houses the cell element and the cover member which closes an opening of the can body to seal the cell element, and an electrolyte injected into the cell can. The insulating plate includes a plate-shaped insulating plate body having insulating property, an injection hole which passes through the insulating plate body in the thickness direction and through which the electrolyte can be injected, and a filter member permeable to only the electrolyte and provided on one of the surfaces of the insulating plate body so as to cover the injection hole.

A novel intelligent control direct-current brushless electric pick comprises a rear-end handle, a brushless motor controller, a direct-current brushless motor, a speed reducing transmission mechanism, a rear end cover, a front-end handle, a shell and a front-end cover. The speed reducing transmission mechanism comprises a gear I, a gear II and a gear III. The direct-current brushless motor comprises a spring washer, a transmission shaft, a rotor, a stator, a bearing I, a bearing II and a cooling fan. According to the novel intelligent control direct-current brushless electric pick, the direct-current brushless motor is adopted, a non-Hall mode is adopted as the control mode, the brushless motor controller is of a full-potting integrated structure, a brushless driving PCB is reinforced on the brushless motor controller through potting adhesives with superior heat conduction performance, and therefore very good vibration resistance is achieved. The service life of the electric pick is greatly prolonged, the novel intelligent control direct-current brushless electric pick is free of maintenance, the reliability is improved, the efficiency of the direct-current brushless motor is high and the energy saving effect is achieved.

The invention discloses an electric automobile smooth capacitor, comprising a main capacitor set, and two leading-out terminals respectively connected to two poles of the main capacitor set; two Y capacitors which are in parallel connection with the main capacitor set after series connection are arranged between the two leading-out terminals; a neutral point leading-out ground terminal is arranged between the two Y capacitors. The main capacitor set is composed of a plurality of capacitor element in parallel connection. The electric automobile smooth capacitor can restrain common mode interference, and has the characteristics of smaller ESR and ESL, and good weather fastness.

The invention relates to a high-precision vibration-resistant Pirani vacuum sensor, which mainly solves the technical problems of low measurement accuracy, low stability and low vibration resistance existing in the prior art. The high-precision vibration-resistant Pirani vacuum sensor solves the problems by adopting a technical scheme that a temperature sensing device includes a sensitive elementunit, the sensitive element unit is of a spiral filament structure, the spiral filament structure includes four layers of spiral bodies, the first layer of spiral body is a spiral body formed by spirally winding an auxiliary tungsten filament around a first main tungsten filament, the second layer of spiral body is a spiral body formed by spirally winding the first layer of spiral body around a second main tungsten filament, the third layer of spiral body is a spiral body formed by spirally winding the second layer of spiral body, and the fourth layer of spiral body is a spiral body formed byspirally winding the third layer of spiral body; and the tungsten filaments are spirally twin-twisted tungsten filament combinations. The high-precision vibration-resistant Pirani vacuum sensor can beapplied to industrial production of vacuum sensors.

The invention relates to an integrated Hall-effect sensor, which is applied to the fields such as distance detection, speed detection, angle detection, rotate speed detection and the like, specifically applied to the fields of automobile cam and crank speed / position detection, an automobile and industrial autometers, treadmills, automatic control, textile machinery and the like. The integrated Hall-effect sensor comprises a Hall element and a lead group. The pins of the Hall element are connected with the lead group, mutually matched bracket and hollow shell are also arranged on the Hall-effect sensor, and the Hall element is fixed in the bracket which is fixed in a cylindrical hollow shell which is magnetically tempered. The invention has the advantages of small volume, wide application range, simple production and installation, integrally packaged magnetic steel shell, high overall reliability, strong shake resistance, strong interference resistance and good consistency.