28results about How to "Guaranteed connection quality" patented technology

The invention relates to a vehicle-mounted network switching method and device in an Internet of Vehicles environment and electronic equipment, and the method comprises the steps: determining the receiving power of a target vehicle when the target vehicle is connected with each network base station in the future based on the future trajectory information and a channel knowledge graph of the target vehicle, and the channel knowledge graph comprises the channel information of each position; according to the future trajectory information of the target vehicle, determining the residence time of the target vehicle in the coverage range of each network base station in the future; and determining a target network switching strategy of the target vehicle based on the residence time of the target vehicle in the coverage range of each network base station in the future, the receiving power when each network base station is connected in the future, the network base station switching cost and the real-time load of each network base station. The problem that network switching achieved by an existing vehicle-mounted network switching method is prone to lagging behind communication environment changes is solved.

The invention discloses an error detection device for electric energy meter metering, and relates to the technical field of electric energy meter calibration, the error detection device comprises a calibration instrument body, a wire and a connector, the calibration instrument body is provided with interfaces at equal intervals, the wire is connected with the connector, and the connector is matched with the interfaces. The calibration instrument further comprises a centralized access mechanism, an opening and closing regulation and control mechanism and a locking control mechanism, the centralized access mechanism, the opening and closing regulation and control mechanism and the locking control mechanism are all arranged on the calibration instrument body, through the arrangement of the centralized access mechanism, the movable sleeve can be pushed in a centralized mode through the elastic reset effect of an elastic telescopic column on a push plate, and the calibration instrument is convenient to operate. The connector is inserted into the interface, so that rapid and automatic insertion of the connector and the interface is realized, the connector is accessed in a centralized manner and managed in a unified manner, human intervention is reduced, a worker does not need to independently operate an electric wire and the connector one by one, errors caused by misoperation or negligence are reduced, and the accuracy of metering error detection and verification data of the electric energy meter is improved.

The invention discloses a reinforcement sleeve connection torque and displacement double-control intelligent monitoring vibration reminding device and a using method thereof, and relates to the technical field of building construction. The problems that existing steel bar sleeve connection depends on artificial experience, and the connection quality is difficult to ensure are solved. The torque sensor and the displacement sensor are integrated on the wrench, the torque value and the steel bar insertion depth in the connecting process are monitored in real time, and therefore dual control over the connecting quality is achieved; comprehensively judging a connection state by utilizing a PID controller and combining a feedforward and feedback control mechanism; when the monitored torque value and displacement data reach preset values at the same time, an acousto-optic vibration prompt is given out through a vibration reminding device to remind an operator that connection is completed; according to the method, the connection precision and the construction efficiency are improved, manual judgment errors are reduced, the reliability of a building structure and the construction safety are ensured, powerful support is provided for follow-up quality tracing, and therefore the intelligent process of the building construction industry is further promoted.

A combined type pin connecting joint comprises two pile bodies to be in butt joint, end plates are arranged at the opposite ends of the two pile bodies, a plurality of open grooves are formed in the opposite sides of the two end plates, the open grooves of the two end plates correspond one by one and penetrate to the peripheral walls of the corresponding end plates, limiting grooves with the width increased are formed in the far ends of the two corresponding open grooves, and the limiting grooves are matched with the limiting grooves. Every two corresponding open grooves are connected through a combined pin, each combined pin comprises two pin bodies and a pin inserting piece, the two pin bodies are arranged on the two sides of the open grooves in the width direction, the two ends of each pin body are inserted into the two open grooves respectively, and protruding parts are arranged at the two ends of each pin body respectively. The pin inserting piece is inserted between the two pin bodies so that the two protruding parts of the pin bodies can be clamped into the limiting grooves of the two corresponding open grooves respectively, and through the design of the combined pin, the connecting quality is guaranteed, and meanwhile the assembling difficulty can be lowered.

The invention relates to the technical field of the building industry, and discloses a fabricated steel structure and an installation method, the fabricated steel structure comprises frame columns and frame beams, and the frame columns and the frame beams are connected in a matched mode; the modular node units are detachably connected with the frame columns and the frame beams respectively; the modularized joint unit comprises a first connecting plate and a second connecting plate, the sides, deviating from each other, of the first connecting plate and the second connecting plate are suitable for being connected with one ends of the adjacent frame columns correspondingly, and a box type steel column section is arranged between the first connecting plate and the second connecting plate; the two ends of the box type steel column section are connected with the first connecting plate and the second connecting plate correspondingly. The modularized joint units are further provided with I-shaped steel beam ends, and the two I-shaped steel beam ends are connected with the two ends of the box type steel column section respectively in the extending direction of the frame beam.

The invention discloses a reinforcing steel bar connecting sleeve, a connecting structure and a construction method, and relates to the technical field of building reinforcing steel bar connection.The reinforcing steel bar connecting sleeve comprises a sleeve body and reinforcing steel bars to be connected, and the sleeve body comprises a sleeve body and a sealing gasket located at the end opening of the sleeve body; a closed cavity is formed in the barrel through the sealing gasket, and a cementing material is arranged in the closed cavity of the barrel; the connecting reinforcing steel bars penetrate through the sealing gasket and penetrate into the cylinder body, the connecting reinforcing steel bars are wrapped by the cementing material, and the cylinder body is connected with the reinforcing steel bars. The invention has the advantages that the cementing material is injected into the sleeve in advance, only the reinforcing steel bar is inserted during installation, the installation is convenient, and the connection is reliable; due to the structure of the sealing gasket, little cementing material leaks out, the connection of the sleeve is visually checked due to the arrangement of the material bolt hole, and compared with an existing grouting sleeve, the connection quality is better guaranteed; the sleeve can be applied to a cast-in-place environment and a prefabrication environment, and the other end of the sleeve is provided with ports in different forms, so that the sleeve can be suitable for various occasions and is convenient to install and efficient in connection.

The utility model discloses a kind of flexible flat cable automatic plug-in mechanism, including workbench, rack and counterplug mechanism, two placement cavities are arranged at intervals on rack, one of two placement cavities is used to place test mainboard, another is used to place panel to be tested, test mainboard has first socket, panel to be tested has second socket;Counterplug mechanism includes rack, first driving part and clamping assembly, first driving part is set on rack, the drive end of first driving part is provided with clamping assembly, clamping assembly includes second driving part and two clamping pieces set on second driving part, clamping piece is used to clamp flexible flat cable, first driving part can drive clamping assembly to move along first direction, second driving part can drive two clamping pieces to be away from each other and the both ends of flexible flat cable are respectively inserted in first socket and second socket, realize the automatic connection of test mainboard, flexible flat cable and panel to be tested, and connection precision and connection efficiency are high.

The utility model discloses a wind driven generator blade mounting device, which relates to the technical field of wind driven generators and comprises a fixing plate, a steel rope arranged on the fixing plate through a connecting column, a lower clamping plate arranged at the bottom of the fixing plate through a mounting shell, a sliding plate arranged in the mounting shell through a sliding rail, an upper clamping plate arranged on the sliding plate, and a first bevel gear arranged on a threaded rod. A second bevel gear is rotationally arranged in the mounting shell through a rotating shaft and connected with the first bevel gear. Under the action of moving the upper clamping plate up and down, the wind driven generator blade clamping device can better clamp and fix wind driven generator blades of different sizes, so that the actual use requirement is better met, the clamping and fixing quality of the upper clamping plate on the wind driven generator blades is guaranteed when the clamping device is matched with a worm gear and a worm for use, and the working efficiency is improved. And under the action of the connecting column and the fixing plate, the connecting quality of the device and the hoisting device is guaranteed.

This utility model discloses a construction connection node for a low-level plate and a column base reinforcement. It includes column base reinforcement welded to the top of the inner cavity of a concrete base layer. A column base is fixedly connected to the central axis of the top of the column base reinforcement. Low-level plates are attached to both the front and rear sides of the column base, and the two low-level plates are fixed to the top of the concrete base layer. Connecting plates are attached to both the left and right sides of the column base. The side of each connecting plate away from the column base is fixedly connected to the low-level plate. Two symmetrical connecting pieces are bolted to the bottom of each connecting plate. This utility model supports and fixes the column base using low-level plates and connecting plates. The combined use of I-beams, connecting steel, and transverse connecting steel ensures the stability and reinforcement of the column base during support, thereby ensuring the accurate positioning of the low-level plates and connecting plates when fixing the column base to the top of the inner cavity of the concrete base layer.

The present application belongs to the technical field of hydraulic components, in particular to a stainless steel oil pipe connecting piece for truck cab turnover system, which comprises a fixing piece, a connecting pipe, a sliding piece, a driving piece and a mounting piece; the present application drives two sliding pieces to move by rotating the driving piece, and then drives the pushing structure to move, and then drives the extrusion piece to move to one side of the connecting pipe, and then makes the extrusion part resist on the side of the oil pipe end, and then makes the side of the place deform to the convex structure and form an inclined plane, and the lower side of the inclined plane resists on the convex structure, and the upper side of the inclined plane and the extrusion part resist each other, and then fixes the position of the inclined plane, and then connects the oil pipe and the connecting piece together, and then connects two oil pipes together, and then completes the connection of the pipeline; the connection of two oil pipes can be completed by rotating the driving piece, and then the special clamp is avoided to connect the oil pipe, and then the connection of the oil pipe is facilitated.

The invention provides a prefabricated self-resetting energy dissipation combination column structure, and relates to the technical field of seismic resistance and seismic mitigation and isolation devices. The device comprises an upper column body and a lower column body, two parallel connecting sliding rails are arranged at the bottom of the upper column body, a sliding groove is formed between the connecting sliding rails, a mounting hole communicated with the sliding groove is formed in the tail end of the sliding groove, and a self-resetting buckle which can slide along the sliding groove and is clamped with the mounting hole in a matched mode is arranged at the top of the lower column body. The limiting block and the connecting sliding rail are installed in a matched and sliding mode, and the top end and the bottom end of the limiting block are detachably connected with the upper column body and the lower column body through fasteners respectively. The connecting sliding rail at the bottom of the upper column body and the self-resetting buckle at the top of the lower column body are rapidly spliced to achieve rapid and stable installation of the column bodies, the advantage of being easy and convenient to construct is achieved, all components are prefabricated in a factory and rapidly assembled on a construction site, and material waste and environmental pollution are reduced while the connecting quality and safety are guaranteed; and the method has good economical efficiency.

This invention relates to the field of ship installation technology, and discloses a shore-based installation method and device for stern-mounted flexible hoses. It overcomes site limitations, considering the confined space at the stern of an FPSO, by employing a simple installation device and utilizing land resources for operation. Even with limited space on the ship, rapid and accurate installation can be achieved. This invention minimizes damage during the installation of the stern-mounted flexible hose. During the connection process, an installation trolley is placed at three positions—fore, middle, and aft—to support the hose and prevent bending damage during connection. Furthermore, a specialized guide column is used during the retrieval of the stern-mounted flexible hose to the winch drum, improving installation efficiency and ensuring reliability. By controlling the radius of curvature at the inflection points of the stern-mounted flexible hose and the position of the lifting points, damage or breakage due to improper angle control at the inflection points is prevented. Pressure testing verifies the reliability of the connection and ensures connection quality.

The utility model provides a kind of steel encloses purlin wing plate connecting device, including the wing plate side wall of at least one side of steel encloses purlin joint place close adhesion's connecting plate, connecting plate one end is equipped with first clamping part, connecting plate other end is equipped with second clamping part, first clamping part and second clamping part are oppositely arranged;First clamping part and second clamping part are all clamped on the wing plate of steel encloses purlin joint place, wherein, first clamping part is clamped on the one end of wing plate along vertical direction, and second clamping part is clamped on the other end of wing plate along vertical direction.The utility model can guarantee the connecting quality while effectively reducing steel encloses purlin wing plate connecting difficulty, improve installation efficiency and material turnover rate.

The present invention relates to the technical field of crimping parameter processing, and in particular to a terminal crimping optimization analysis method for a new energy vehicle wiring harness. The method comprises the following steps: performing spatial structure topological analysis on the crimping process of the new energy vehicle wiring harness terminal, and performing terminal position and direction analysis to obtain the crimping position of the new energy vehicle wiring harness terminal and the crimping direction of the new energy vehicle wiring harness terminal; performing three-dimensional modeling processing and crimping parameter analysis on the spatial topological structure of the new energy vehicle wiring harness to obtain the crimping deformation parameters of the automobile wiring harness terminal and the crimping contact pressure distribution parameters of the automobile wiring harness terminal; performing terminal crimping quality assessment analysis and terminal crimping optimization analysis on the crimping process of the new energy vehicle wiring harness terminal, generating a new energy vehicle wiring harness terminal crimping parameter optimization scheme, and executing the corresponding terminal crimping parameter adjustment optimization process. The present invention can achieve the optimization of terminal crimping parameters.

This utility model relates to the field of nonwoven bag manufacturing, and discloses a nonwoven bag with fixing straps and its processing equipment. The nonwoven bag includes a bag body, and each bag body is provided with four fixing straps. One end of each fixing strap is fixed to the front, and the other end is fixed to the connecting surface. The processing equipment includes a frame, a fixing strap conveying device, and a fixing strap connecting device. The frame is equipped with a fixing strap pulling guide rail. The fixing strap connecting device includes a fixing strap pulling mechanism, a cutting device, a fixing strap feeding mechanism, and a connecting mechanism. The fixing strap feeding mechanism clamps the cut fixing straps and feeds them to the fixing position. The connecting mechanism includes pressing components located on the upper and lower sides of the bag sheet conveying path. The pressing components move towards each other to fix both ends of each fixing strap to the bag sheet. This utility model completes the connection between the fixing straps and the bag body before the bag body is formed, so that after the bag body is formed, the fixing straps are directly inside the bag body, and can be pulled open to achieve the fixing function.

The utility model relates to a tensioning tool structure of a double-lug-plate stay cable at a steel structure node, which comprises a heavy frame, a tensioning device and a tensioning device, the heavy frame is arranged on a cable body of the stay cable in a penetrating manner, and one side of the heavy frame abuts against an anchorage device of the stay cable; the pull rods are arranged on the outer sides of the stay cables, and the two ends of the pull rods are connected between the lug plate sets correspondingly connected to the two sides of the stay cables correspondingly; the plurality of insertion lugs are respectively arranged at the joints of the plurality of pull rods and the lug plate group; and the multiple jacks are arranged on the pull rod in a sleeving mode, abut against one side of the heavy frame and provide tensioning force. The heavy frame is arranged on the stay cable and the pull rods in a penetrating mode to disperse weight, construction accuracy can be improved, the heavy frame is formed by splicing the force bearing units, the heavy frame is connected after the stay cable is installed, working efficiency is improved, the inserting lugs are arranged at the connecting positions of the pull rods, and connecting quality of the structure is guaranteed.

The utility model discloses a water conservancy pipeline connection auxiliary device which comprises a fixing base, fixing stand columns are fixedly connected to the four corners of the top end of the fixing base, a lifting frame is movably connected to the middles of the fixing stand columns, a first threaded rod is rotatably connected to the middle of the lifting frame, and a sliding plate is movably connected to the interior of the lifting frame. A first threaded rod penetrates through the middle of the sliding plate and is connected with threads, a lifting driving assembly is fixedly connected to the middle of the fixed base, walking wheels are fixedly installed at the four corners of the bottom end of the fixed base, a moving assembly is fixedly connected to the top end of the sliding plate, and a clamping and fixing assembly is installed in the moving assembly. A supporting assembly is fixedly connected to the top end of one side of the lifting frame, a transmission assembly is movably connected between the supporting assembly and the moving assembly, when the device is used, the positions of the clamping frame and the bearing frame can be adjusted, installation and position adjustment of a pipeline are facilitated, the stable fixing effect is guaranteed, and the pipeline connecting quality is guaranteed.

The utility model discloses an airplane sewage outlet sewage pipe butt joint auxiliary device, include: connecting ring, it is used to set and fixed on the butt joint of sewage pipe, and connecting ring is sheet structure and its outside is equipped with at least two clamps, handheld piece is the hollow structure of two ends opening, and the connecting end of handheld piece is fixed on the inside of connecting ring and the diameter of its holding end is greater than the diameter of connecting end, wherein, when connecting ring installs on butt joint, the hose of sewage pipe is arranged on handheld piece. The utility model can improve the convenience of butt joint operation, guarantee the connection quality of sewage pipe on sewage outlet, reduce the risk that the airport is polluted by sewage due to the falling of sewage pipe in the use process.

The invention relates to the technical field of fabricated structures, in particular to a prefabricated vertical component bottom connecting device and a construction method. A hollow box-shaped structure is arranged at the middle upper part of the connecting device, and one side of the connecting device is exposed to form a groove; a threaded connection end is arranged at the upper part of the box-shaped structure and is in threaded connection with a vertical reinforcing steel bar in the prefabricated vertical component; a barrel is arranged at the lower part of the box-shaped structure, and a spiral rib surrounds the periphery of the barrel; the top of the lower component is vertically provided with a vertical connecting rib, penetrates through the cylinder and is inserted into the inner cavity of the box-shaped structure for a certain length during installation, the vertical connecting rib is fixed in the groove through bolt connection, grouting materials are injected into gaps of the inner cavity of the cylinder in the later period, and the grouting materials are hardened to form a whole. According to the invention, the structure is reasonable, the connection is reliable, the on-site installation speed of vertical members such as prefabricated walls and columns can be greatly improved, an inclined support is omitted, the construction cost is greatly reduced, the vertical tension and compression force transmission and horizontal shear resistance of the vertical steel bars can be realized, and the anti-seismic property and the structural safety of a fabricated building can be ensured.

A high-voltage wire harness connection assembly and a wire harness assembly for a vehicle, the connection assembly comprises a main body, the main body comprises a fixing part and a sealing part, the fixing part is used for connecting a first wire harness and a second wire harness which are made of different materials, the fixing part comprises a support member and a positioning member at least located at one end of the support member in a first direction, and the sealing part is used for sealing the first wire harness and the second wire harness. The supporting piece is used for making contact with and being electrically connected with a first connecting section of the first wire harness and a second connecting section of the second wire harness, and the positioning piece is used for making contact with and being connected with at least one side of the first connecting section and / or the second connecting section in the second direction. The sealing part comprises a sleeve piece at least wrapping the outer side of the fixing part, the wire harness assembly comprises at least one first wire harness, at least one second wire harness and the connecting assembly, the overall weight of the wire harness can be reduced, weight reduction and cost reduction are facilitated, and good connecting stability and high practicability are achieved.

The utility model discloses an inclined strut steel structure connecting assembly which comprises an inclined strut and connecting bases arranged at the two ends of the inclined strut, the connecting bases are arranged on the inclined strut in a sliding mode, and locking screws are arranged on the side walls of the connecting bases in a screwed mode respectively. And the inclined strut and the connecting seat can be fixedly connected by screwing the locking screw into the connecting seat. According to the inclined strut steel structure connecting assembly, through the design of the slidable connecting base, the connecting position can be flexibly adjusted according to on-site construction errors, the installation difficulty is effectively lowered, construction time and labor cost waste are reduced, meanwhile, the connecting quality is guaranteed, and the construction efficiency and quality level of a steel structure building are improved; and the stability and reliability of the whole steel structure building are enhanced.

The invention belongs to the technical field of assembly type bridges, and provides a full-assembly type steel-concrete composite beam bridge capable of being quickly disassembled and assembled and an erecting method thereof.The full-assembly type steel-concrete composite beam bridge comprises one or more sets of prefabricated bridge deck slabs, each prefabricated bridge deck slab comprises a stiff framework steel formwork, and each stiff framework steel formwork comprises a bottom formwork assembly; groove-shaped steel plates are vertically and fixedly connected to the two sides of the bottom formwork assembly respectively, steel fiber reinforced concrete is poured to the upper portion defined by the bottom formwork assembly, the groove-shaped steel plates and the end formworks, the top face of the bottom formwork assembly is fixedly connected with two or more sets of lower perforated rib plates in the transverse bridge direction, and T-shaped perforated rib plates are fixedly connected to the two sides of each lower perforated rib plate respectively. The bottom of the T-shaped perforated rib plate is fixedly connected with the bottom template assembly; and the top of the steel beam structure and the base steel plate of the bottom formwork assembly are rapidly assembled and connected through the shear-resistant connecting assembly, the anti-pulling screw assembly and the prefabricated bridge deck. According to the steel rib-concrete combined structure, the mechanical property of a bridge is guaranteed, and meanwhile the field assembly and disassembly efficiency is remarkably improved.

The invention relates to a motor, an electric drive system and a vehicle, the motor comprises a motor rotating shaft, a supporting piece and a shell, the supporting piece comprises a first part and a connecting part, the first part is located between the motor rotating shaft and the shell in the axial direction of the motor, and a containing cavity suitable for containing damping liquid is formed in the first part; the connecting part is located outside the motor rotating shaft and the shell in the axial direction of the motor, and the connecting part is connected with the end face of the shell. The supporting piece can well restrain vibration of the motor rotating shaft, so that high speed of the motor rotating shaft is allowed, the motor rotating shaft has the advantages brought by high speed, at least part of installation and fixing work between the supporting piece and the shell can be carried out outside the shell, enough connecting point positions exist between the supporting piece and the shell, and therefore the supporting piece can be conveniently installed and fixed. Particularly, through the axial limiting effect of the end face of the shell, the risk that the supporting piece moves in the axial direction of the motor can be reduced, and therefore the reliability of connection between the supporting piece and the shell can be guaranteed.

The utility model relates to a welding machine for yoga mat production, which comprises a carrier roller support A and a carrier roller support B. A gap is arranged between the carrier roller support A and the carrier roller support B. A cutter mechanism is arranged at the gap and comprises fixed supports arranged on two sides of the gap, a group of transversely arranged guide rods are respectively arranged at the upper end and the lower end between the two fixed supports, and the guide rods are arranged in the gap. A sliding seat is arranged on each group of guide rods, an electric conductor is arranged on each sliding seat, the two electric conductors are provided with joints and are respectively connected to a positive electrode and a negative electrode of a power supply, a cutter is connected between the electric conductors of the two sliding seats, and two groups of driving mechanisms are respectively arranged on the two fixed brackets corresponding to the two sliding seats. The two groups of driving mechanisms synchronously act to enable the two sliding seats to synchronously move in the same direction; the opposite ends of the carrier roller support A and the carrier roller support B are each provided with a set of material pressing mechanism, and the material pressing mechanisms are used for pressing a yoga mat. According to the utility model, the connection quality and strength of the welding part are ensured, and the product quality stability is improved.

The utility model provides an antiskid chain which comprises a first annular co-force fixing lockrand iron chain ring and a second annular co-force fixing lockrand iron circular ring arranged below the first annular co-force fixing lockrand iron chain ring, antiskid chain rings and chain links are arranged between the first annular co-force fixing lockrand iron chain ring and the second annular co-force fixing lockrand iron circular ring, and the first annular co-force fixing lockrand iron chain ring and the second annular co-force fixing lockrand iron circular ring and the second annular co-force fixing lockrand iron circular ring are mutually clamped to form a V-shaped antiskid chain. The steering wheel is made of steel materials, has stable snakelike walking, does not jump or resonate in the driving process, and improves the stability of the steering wheel. The iron circular ring enables peripheral force to be synchronously dragged, and the internal firmness is enhanced. The external iron chain is convenient to adjust the size and deal with abrasion deformation, and the external steel wire is reinforced and is not easy to loosen after being tightened. The annular steel wire and the iron chain respectively adopt a semi-annular drag hook and an annular drag hook, so that the installation and the disassembly are convenient, and a semi-annular lock catch on the steel wire can prevent the iron chain from sliding. The antiskid chain is excellent in antiskid performance, structure and use convenience, and can effectively improve the safety and stability of a vehicle running on a wet and slippery road surface.

The application discloses a cylindrical oil storage equipment processing method, which comprises the following steps: firstly, processing process steps, process notches and process bosses respectively at the butt joint of a flange plate and a connecting plate before welding; secondly, adopting electron beam to weld the flange plate and the connecting plate, and adopting copper sleeve protection on the axis of a clamp corresponding to the electron beam influence area to ensure that the axis of the clamp does not deform; and thirdly, adding a positioning process boss as a fixed support point to the outer side of a first mounting base, inserting a coaxial welding mandrel into the inner holes of the first mounting base and a second mounting base and fixing and supporting, fixing and supporting at the positioning process boss, and supporting the outer surface of the second mounting base. The application realizes correct butt joint of the welding surface of the flange plate and the connecting plate, prevents the welding seam from collapsing, guarantees the connecting strength and quality after welding, and ensures that the inner hole coaxiality of the first mounting base and the second mounting base meets the installation precision requirement of an oil level sensor.

The application provides a MEMS piezoelectric device, relates to the field of semiconductor technology, and comprises an electrode layer, the electrode layer comprises a bottom electrode and a middle electrode, or the electrode layer comprises a bottom electrode, a middle electrode and a top electrode, and a piezoelectric layer is arranged between the bottom electrode and the middle electrode and between the middle electrode and the top electrode; when the top electrode is provided with a through hole structure, below the through hole structure corresponds the middle electrode and / or the bottom electrode in the stacking direction; when the middle electrode is provided with a through hole structure, below the through hole structure corresponds the bottom electrode in the stacking direction. The problems of grain boundary precipitation in the piezoelectric layer area above the electrode layer corresponding to the through hole structure are solved, the surface deposition quality of the device is ensured, the precision of through hole etching can be improved, the connection quality of the through hole is ensured, and the performance of the MEMS system is ensured.