76results about How to "Guaranteed connection reliability" patented technology

The invention discloses a hinge assembly, a mechanical joint and a robot. A plurality of structural members of the hinge assembly comprise a first structural member, a second structural member and a third structural member. The plurality of bearings of the hinge assembly includes a first bearing and a second bearing. In the axial direction, the bearing seat of the second structural part is located between the bearing seat of the first structural part and the third structural part, the first bearing ring is located between the first bearing and the second bearing, and the two end faces of the first bearing ring abut against the inner ring of the first bearing and the inner ring of the second bearing correspondingly. The second bearing ring is located between the second bearing and the third structural part, and the two end faces of the second bearing ring abut against the inner ring of the second bearing and the third structural part correspondingly. The hinge assembly further comprises a fastening assembly, and the fastening assembly fastens the inner ring of the first bearing, the first bearing ring, the inner ring of the second bearing, the second bearing ring and the third structural part together in the axial direction. Therefore, linkage of the third structural part, the inner ring of the first bearing and the inner ring of the second bearing can be achieved.

The utility model relates to a pressure measuring diaphragm capsule protecting and cleaning device which comprises a top cover and a base, clamping grooves are formed in the bottom of the top cover at equal intervals, clamping strips are fixedly connected to the top of the base at equal intervals, the clamping strips are used in cooperation with the clamping grooves, and the base is located on the outer side of a measuring diaphragm capsule. The device has the beneficial effects that a disposable film can be quickly fixed above the measuring diaphragm capsule, the influence of the external environment on the measuring diaphragm capsule is reduced, and the risk that the measuring diaphragm capsule is damaged or the measuring precision is reduced due to factors such as accidental collision or dust is reduced.

The application relates to a gear expansion sleeve structure for coaxially fastening a gear on a connecting shaft, which comprises an inner pressure expansion sleeve, an outer pressure expansion sleeve and adjusting screws, the inner pressure expansion sleeve is axially symmetrically sleeved on the outer surface of the connecting shaft, the inner surface of the inner pressure expansion sleeve is gradually abutted against the outer surface of the connecting shaft; the outer pressure expansion sleeve is axially symmetrically sleeved on the inner diameter of the gear, and the end portion is abutted against the end surface of the gear, the outer surface of the outer pressure expansion sleeve is gradually abutted against the inner surface of the inner pressure expansion sleeve; the adjusting screws are provided with a plurality of end portions penetrating through the inner pressure expansion sleeve and the outer pressure expansion sleeve, and the inner pressure expansion sleeve is axially moved by being extruded through the axial movement of the adjusting screws, and is abutted against the inner surface of the outer pressure expansion sleeve and the outer surface of the connecting shaft, and the outer surface of the outer pressure expansion sleeve is extruded to the inner surface of the gear. The application realizes the stability between the gear and the connecting shaft, makes the component combination force more reasonable, and ensures the stability of the overall structure.

The utility model belongs to building construction technical field especially for a kind of replaceable building pipeline pre-burying positioning slot structure, including strip board, support adjusting component, sliding seat, transverse position adjusting component, two slot positioning frames, two hollow shafts, open-close adjusting component and quick-release fixing component;The support adjusting component is set on strip board and is close to the position of both ends, the sliding seat is slidably installed on strip board, the transverse position adjusting component is set on the top side of strip board and is connected with sliding seat.The utility model design is reasonable, easy to operate, can realize the quick adjustment and accurate fixing of pipeline pre-burying positioning, can flexibly adjust the space position of slot positioning frame according to actual construction demand simultaneously, greatly improves construction efficiency, and using the mode of modular design makes each component can be replaced and maintained separately, reduces use cost, especially suitable for the complex building scene needing frequent adjustment pipeline direction.

This invention discloses a car roof rack assembly fixture, comprising: a connecting assembly; a pair of clamping assemblies respectively connected to both ends of the connecting assembly for positioning and clamping the corresponding roof rack; a clamping mechanism connected to the connecting assembly; and an adsorption assembly configured to adsorb onto the glass roof, and applying force to the connecting assembly through the clamping mechanism to press the roof rack clamped by the pair of clamping assemblies firmly against the surface of the glass roof. This car roof rack assembly fixture of the present invention can achieve precise assembly and positioning of the roof rack and glass roof, ensuring the consistency of the final product's appearance and the reliability of the connection, thereby improving production efficiency and product quality. The present invention also discloses a method for assembling a car roof rack and a glass roof.

This invention discloses a double-row pile retaining structure for foundation pits and its construction method, aiming to provide a double-row pile retaining structure for foundation pits with good deformation control, strong resistance to earth pressure, and high stability. A double-row pile retaining structure for foundation pits includes: a front row of piles, which are set in the soil; a front row of pile capping beam, with the top of the front row of piles connected to the front row of pile capping beam; a rear row of piles, which are set in the soil, with the front row of piles located between the rear row of piles and the foundation pit; a rear row of pile capping beam, with the top of the rear row of piles connected to the rear row of pile capping beam; a tie beam, connecting the front row of pile capping beam and the rear row of pile capping beam; and lapped steel sections, which are inserted into the soil, the lapped steel sections are inclined, the lower end of the lapped steel sections is connected to the rear row of piles, and the upper end of the lapped steel sections is connected to the tie beam or the front row of pile capping beam.

This invention discloses a multi-branch battery pack high-voltage system and its control method. The multi-branch battery pack high-voltage system includes: multiple battery pack branches, a charging control module, and a discharging control module. Each battery pack branch includes a battery pack, a battery drain interrupter (BDU), and a bidirectional DC-DC converter module. The battery pack is connected to the input terminal of the BDU. The BDU has a main circuit and an equalization circuit. The main circuit controls the on / off of the main power of the battery pack branch it belongs to. The BDUs of each battery pack branch are connected to each other through the equalization circuit for active equalization between branches. The output terminal of the BDU is connected to the input terminal of the bidirectional DC-DC converter module, which controls the charging and discharging current of its respective battery pack branch. The output terminals of all bidirectional DC-DC converter modules are connected in parallel and then connected to the charging control module and the discharging control module. This invention can solve the circulating current problem between battery packs and improve the stability of the multi-branch battery pack high-voltage system.

The utility model relates to the technical field of display lamp panels, and discloses a digital display lamp panel which comprises a lamp panel body, a display mechanism is arranged at the front end of the lamp panel body, the lamp panel body comprises a lamp panel body, and mounting holes are formed between the front side wall and the rear side wall of the four corners of the lamp panel body. Four threaded holes are formed in one side of the front end of the lamp panel body in a rectangular array shape, and a contact type socket is arranged at the front end of the lamp panel body and located among the four threaded holes. Effective electromagnetic shielding measures are adopted, namely, the anti-interference display driving board is arranged at the rear end of the lamp panel, and the metal shielding cover is arranged outside the display driving board and the data transmission mainboard, so that the lamp panel is isolated from an external electromagnetic interference source, meanwhile, the circuit layout of the lamp panel is optimized, internal electromagnetic interference is reduced, and the service life of the lamp panel is prolonged. And anti-interference elements, namely a filter capacitor and a filter inductor, are added in the driving circuit, so that the anti-electromagnetic interference capability of the lamp panel is improved.

The utility model provides a detachable cycling garment which comprises an upper garment body and a lower trouser body which can be separated from each other, the bottom of the upper garment body extends downwards to form an outer-layer elastic waist tube, and the inner wall of the outer-layer elastic waist tube is provided with a buckling groove body. The top of the lower body extends upwards to form an inner-layer elastic waist opening which can be covered by the outer-layer elastic waist cylinder, and the outer wall of the inner-layer elastic waist opening is provided with a buckling strip body which can be clamped and matched with the buckling groove body; the buckle strip body and the buckle groove body are both magnetic, the buckle strip body is provided with a first limiting part and a second limiting part which are perpendicular to each other, the buckle groove body is provided with a first protruding part and a second protruding part, and the first protruding part and the second protruding part are arranged on the groove bottom wall and the groove side wall which are perpendicular to each other on the buckle groove body respectively; when the buckle strip body is clamped and matched with the buckle groove body, the first limiting part abuts against the first protruding part, and the second limiting part abuts against the second protruding part. The utility model solves the problems that the one-piece riding clothes are inconvenient to wear and take off, and the aerodynamic performance is influenced by the split scheme.

This utility model discloses a composite aluminum panel, including a wall. An aluminum panel body is provided on one side of the wall, and a groove is formed on one side surface of the aluminum panel body. A connecting plate is provided on one side of the aluminum panel body, and a reinforcing plate is fixedly installed on one side surface of the connecting plate. In this utility model, by pulling the connecting block on the limiting rod, it moves along the through groove of the connecting cylinder, causing the telescopic rod to move synchronously and compress the outer spring. When the end of the limiting rod disengages from the mounting base, the insert of the connecting plate can be inserted into the wall mounting base. After releasing the connecting block, the spring rebounds, pushing the limiting rod to automatically pass through the insert and engage with the limiting hole of the mounting base, completing a quick locking installation. For disassembly, pulling the connecting block causes the limiting rod to exit the limiting hole, separating the insert from the mounting base, achieving efficient disassembly. This structure utilizes the elastic restoring characteristics of the spring, simplifying the assembly and disassembly process and significantly improving the convenience of maintenance operations while ensuring connection reliability.

The utility model discloses an engine shock -proof connecting support, it relates to vehicle power equipment installation damping field, and the bottom both ends of power source are provided with front connecting piece and rear connecting piece respectively, and are fixedly connected through the power source connecting piece of positioning screw and shock -proof connecting support main part front and rear both ends, the rear of power source connecting piece is provided with buffer sleeve, and the left and right sides in buffer sleeve are equipped with buffer cover, and two reinforcing cross bars are arranged on the carrier support, two reinforcing cross bars all are equipped with two locating rods, and locating rod is provided with locating hole no.

The utility model discloses a kind of light steel structure reinforcing devices for railway locomotive, it is related to steel structure technical field.The utility model includes fixed assembly, connecting assembly being installed on fixed assembly and crossbeam being installed on connecting assembly, fixed assembly includes the fixed frame with trapezoidal limit slot and first limit piece, connecting assembly includes the connecting frame with trapezoidal lug, second limit part and guide pillar, crossbeam is slidably matched with the crossbeam guide slot on connecting frame by guide block.The utility model realizes quick positioning by the cooperation of trapezoidal groove and lug, completes automatic locking using spring pressing effect, realizes mechanical self-locking by the linkage of guide pillar and cross rotating piece, effectively prevent vibration loosening, simultaneously, quick disassembly is realized by the movement of T-shaped slider in L-shaped limit sliding groove, ensure the reliability of connection, and improve installation and maintenance efficiency.

The invention relates to the technical field of photovoltaic supports, in particular to a sloping roof photovoltaic support and a construction method thereof, and the photovoltaic support comprises a plurality of back pull assemblies, a plurality of ground beam assemblies and a plurality of photovoltaic mounting base assemblies. The back pull assembly comprises a rear wall inclined strut, a rear wall transverse strut and a back pull, one end of the rear wall inclined strut is arranged on the rear wall of the house, the other end of the rear wall inclined strut is arranged on the back pull, one end of the rear wall transverse strut is arranged on the rear wall of the house, and the other end of the rear wall transverse strut is arranged on the back pull; the ground beam assembly comprises a front wall inclined strut, a front wall transverse strut and a ground beam, one end of the front wall inclined strut is arranged on the front wall of the house, the other end of the front wall inclined strut is arranged on the ground beam, and one end of the front wall transverse strut is arranged on the front wall of the house. After being installed, the support is not connected with the roof, and an original waterproof layer or waterproof tiles of the roof are prevented from being damaged; by arranging the positioning assembly, positioning installation of the back pull and the ground beam is conveniently achieved, and the construction efficiency is improved.

This utility model provides an LED display module mask, including a mask body, which comprises two sets of first mask plates and a second mask plate. The second mask plate is located between the two sets of first mask plates, and multiple sets of connecting ribs are provided between the second mask plate and the two sets of first mask plates. The second mask plate is integrally formed with the two sets of first mask plates through the multiple sets of connecting ribs. Multiple sets of lamp holes are provided on the first mask plate, the second mask plate, and the connecting ribs. Multiple sets of buckles are provided on the top surface of the connecting ribs. This LED display module mask has a reasonable structural design, which can effectively protect the LED module. Its integrated mask body can resist the intrusion of external impurities, the lamp holes ensure the orderly arrangement of LED beads to optimize the display effect, and the buckles on the connecting ribs facilitate a secure connection with other components. In addition, the mask's good heat dissipation design can dissipate heat in time, ensuring the stable operation of the LED module and greatly improving the practicality and reliability of the product.

The utility model relates to the technical field of vehicle-mounted electronic equipment, especially relates to a rod-shaped interactive intelligent vehicle-mounted terminal, including terminal main body, it is the core processing and control center installation carrier of entire vehicle-mounted terminal, the interface module is integrated to one side of terminal main body, is used for realizing the access and data interaction of external equipment, the two sides of interface module on terminal main body are provided with mounting ear along the axis symmetry of terminal main body, and mounting hole is set up on mounting ear, is used for cooperation fastener and realizes the fixation of terminal and vehicle-mounted structure, the interface module outside symmetry is provided with connecting assembly, and connecting assembly is provided with connecting rod, connecting rod is outwardly extended in the rod shape, and the end is cooperated and is installed with interactive device, is used for receiving user operation instruction and will instruction transmission to terminal main body, realizes the two -way interaction of user and terminal, the utility model is applicable to the vehicle-mounted intelligent upgrading demand of various passenger cars, commercial vehicle, provides stable, convenient vehicle-mounted interactive experience for the user.

This utility model provides a three-axis gantry robot for material handling, belonging to the technical field of gantry robot technology. It addresses the problem that existing traditional gantry robots typically have fixed-size protective structures, posing safety hazards or occupying excessive space when handling goods of varying sizes. The robot includes a gantry body, sliding rods, a drive motor, an extended protective assembly, and a quick-assembly / disassembly assembly. The sliding rods have an "L"-shaped structure, with the left ends of two sliding rods slidably connected inside a fixed box on the left side. The drive motor is fixedly connected to the outside of the fixed box on the right side. The extended protective assembly is located on the outside of the gantry body. The quick-assembly / disassembly assembly is located at the bottom of the actuator. This utility model enables the sliding protective frame to dynamically adjust its protective range according to the workpiece size, improving safety and space adaptability under different working conditions. The tool-less quick-assembly / disassembly structure between the mechanical fixtures significantly shortens the fixture changeover time in multi-variety production.

The present application belongs to the technical field of aviation piston engine. The present application discloses a kind of cylinder body structure and connecting method of air-cooled two-stroke aviation piston engine, to solve the problem of heat load concentration, aluminum alloy strength decline, cylinder deformation caused by the contact thermal resistance of aluminum alloy cylinder and cylinder cover connection area is too large, in the present application, connecting screw and threaded hole are matched with fine thread to increase contact area, reduce contact thermal resistance and enhance heat conduction performance;Threaded hole counterbore is treated to reduce the amount of residual gas in the hole, reduce the obstruction of gas to heat conduction;Connecting anti-loosening strictly prohibits the use of thread glue, to avoid local temperature rise. And using TC4 titanium alloy screw material, threaded hole circumferential uniform arrangement and enough connection depth and other supporting design, systematically make the heat of connection area conduct and dissipate efficiently, avoid the strength decline caused by heat load concentration, improve the anti-deformation ability of cylinder, ensure that the roundness and cylindricity of cylinder meet the design requirements, the engine performance maintains stable under design condition.

The invention provides a solar cell and a photovoltaic module, and the solar cell comprises a cell sheet which comprises a transparent conductive layer; the auxiliary grid lines are located on the transparent conductive layer, extend in the first direction and are arranged at intervals in the second direction, and the first direction intersects with the second direction; the multiple welding wires are located on the sides, away from the transparent conductive layer, of the multiple auxiliary grid lines, and the multiple welding wires extend in the second direction and are arranged at intervals in the first direction; the first grid line segments are located between the auxiliary grid lines and the transparent conductive layer, and the intersection positions of the auxiliary grid lines and the welding wires are located on the first grid line segments in a one-to-one correspondence mode. The problem of low current transmission efficiency of the solar cell in the prior art is solved.

The utility model belongs to the technical field of furniture, and discloses a plate and furniture. The plate comprises a plate body, an edge covering structure and a pressing strip structure. The edge covering structure is provided with a containing groove and an abutting part. The pressing strip structure is arranged in the containing groove and can abut against the plate body, and the plate body can abut against the abutting portion under the abutting action of the pressing strip structure. The plate is high in structural reliability, and manufacturing standardization can be improved.

The utility model discloses an electronic equipment belongs to electronic equipment technical field, including first casing and second casing, and first casing is equipped with elastic positioning spare, and second casing is equipped with positioning slot, and first casing and second casing rotate buckle and install, when first casing rotates to locking position relative to second casing, first casing and second casing rotate buckle tightly, and elastic positioning spare is connected and is limited in the positioning slot. The setting of the electronic equipment avoids the dependence of the connection of traditional bolt, screw and the like on special tools, and the user can complete the installation or separation operation only by rotating the first casing with bare hands or through simple non-professional tools, and the electronic equipment has high adaptability and convenience.

The utility model discloses a visual rapid wire locking structure, which relates to the technical field of junction boxes and comprises a wire locking seat, a front panel of the wire locking seat is arranged in a 45-degree inclined plane mode, a wire locking opening is formed in the front panel of the wire locking seat, a groove is formed in the inner bottom side of the wire locking opening, and a wiring assembly is arranged in the groove. A fixing plate is fixedly installed on the inner wall of the wire locking opening, a limiting plate is slidably arranged on the side, corresponding to the fixing plate, of the inner wall of the wire locking opening in a limiting mode, and the fixing plate and the limiting plate are oppositely arranged. A pressing rod is slidably inserted into the top end of the wire locking base. The pressing rod is pressed downwards to drive the limiting plate to move backwards through the connecting plate to enlarge the gap, a cable is inserted to enable the wiring elastic piece to deform and be conducted, and the spring pushes the limiting plate to reset and clamp the cable after the pressing rod is released. Rapid one-hand operation is achieved, an operator can visually observe the insertion depth, the contact state and the clamping condition of a cable through a 45-degree inclined plane cable locking opening, the wiring efficiency is improved, and the connection reliability is ensured through visual design.

The invention relates to the technical field of aircraft design, in particular to a wired control aircraft modeling unmanned aerial vehicle capable of switching between a manned mode and an unmanned mode. According to the technical scheme, the aircraft comprises an aircraft shell, a replaceable front cabin door, a replaceable rear cabin door and a replaceable lower cabin door. The core is that a wire transmission control system is integrated in a front cabin door which can be opened upwards to form a modularized functional unit. A front door installation table and a wire transmission operation table are arranged on the inner side of the front cabin door, are electrically connected through a plug and a connector on the top and are quickly and mechanically locked and released through an installation mechanism. A sliding rail and a sliding block are arranged in the aircraft shell and used for flexibly positioning the wire transmission operation table and the driver seat. The front cabin door and the rear cabin door are synchronously driven to open and close by a single motor matched with a transmission mechanism. Through modularized replacement of the front cabin door, rapid and safe switching between a manned mode and an unmanned mode is achieved, the problems that a traditional airplane is single in mode and high in refitting cost are solved, and using flexibility and safety are improved.

The utility model discloses an insulated operating rod indirect live-line lap joint arc extinction switch device, and relates to the technical field of live-line operation, one side of an insulated operating rod is fixedly provided with an arc extinction switch, one end of the arc extinction switch is connected with a first fixing piece, and the first fixing piece is used for being connected with an overhead line; one end of the insulated diversion wire is connected with the arc extinction switch through a connecting terminal, and the other end of the insulated diversion wire is connected with a second fixing piece which is used for being connected with a branch knife switch or a drop-out fuse; the clamp is fixedly arranged on the insulation hoop, the insulation hoop is fixedly connected with the insulation operating rod, and the clamp clamps the insulation diversion wire. According to the insulated operating rod indirect live-line lap joint arc extinction switch device, the clamp clamps the insulated current guide wire and is fixed on the insulated operating rod through the insulated hoop, so that the insulated current guide wire is fixed, the insulated current guide wire is prevented from swinging greatly, interference to operation is avoided, and the service life of the insulated current guide wire is prolonged. And meanwhile, the connection terminal at the end part of the insulation diversion wire is prevented from being stressed due to large-amplitude swing, and the connection reliability is ensured.

The invention discloses a manufacturing method of a large-size heterogeneous material hybrid frame, a front section beam and a mounting seat are made of high-strength steel or hot forming steel and are formed by combining electric arc additive materials with inserts in an embedded mode, and the rear end of the front section beam is machined to form an outer inserting end; the middle-rear section beam is made of aluminum alloy and is formed by electric arc additive forming, and the front end of the middle-rear section beam is machined to form an inner inserting end; the shape of the outer wall of the inner inserting end is matched with the shape of the inner wall of the outer inserting end, the inner inserting end and the outer inserting end are connected in an inserting mode, self-piercing riveting connection is adopted in the circumferential direction of the inserting connecting positions, epoxy glue is coated between the connecting faces of the inserting connecting positions to form a glue layer, and a longitudinal beam of the frame is formed. The mounting base is attached to the top face and the outer side face of the longitudinal beam through the inner side face of the L-shaped structure, and the mounting base is connected with the attaching face of the longitudinal beam through a high-strength bolt; reliable manufacturing of the steel-aluminum hybrid frame is achieved, light weight, high strength and low cost of the frame are achieved, and the steel-aluminum hybrid frame is particularly suitable for large-size frames, needing light weight and high strength, of automobiles, rail transit, special equipment and the like.

The application relates to a power distribution cabinet with sockets installed on busbars, and belongs to the technical field of power distribution cabinets. The power distribution cabinet comprises a cabinet body, busbars arranged in the cabinet body, a fixing frame arranged in the cabinet body and an emergency socket. The fixing frame is located below the busbars, the emergency socket is rotationally connected with the fixing frame, a conductive terminal is fixed to one end of the emergency socket away from the interface of the emergency socket, and the conductive terminal is electrically connected with the busbars through a flexible cable. The emergency socket is no longer fixed at a single position by rotationally connecting the emergency socket with the fixing frame and electrically connecting the emergency socket with the fixing frame through the flexible cable, so that the emergency socket has a freedom degree, thereby enabling the emergency socket to be folded to a safe position which does not affect the operation of other devices during a non-use period, and enabling the emergency socket to be turned out to a convenient position which is convenient for plugging and unplugging when electricity is needed. In this way, the space layout inside the power distribution cabinet is optimized, the emergency socket can be prevented from interfering with the cabinet door and other components, and the operation convenience is improved.

This disclosure provides a support structure, a generator assembly, and a wind turbine generator set. The support structure is suitable for generators and includes a support body and a connecting assembly. The support body includes an elastic body for absorbing vibrations. The connecting assembly includes a connecting body and an adapter sleeve. The connecting body is connected to the support body, and a first end of the connecting body supports the generator. The adapter sleeve is disposed at a second end of the connecting body. The connecting body has a mounting hole, and the adapter sleeve is detachably disposed within the mounting hole. The adapter sleeve has a connecting portion configured to receive a connector for connection with the generator. The adapter sleeve and the connecting body are detachably connected, and the adapter sleeve and the connector are matched and connected, facilitating the replacement of the adapter sleeve. This allows the support structure to adapt to different connectors, and thus to different generators.

The invention relates to the technical field of bathroom accessory manufacturing and automatic control, in particular to an assembling method and system for a bathroom quick-assembly part assembly, an intelligent terminal and a storage medium. The first threaded sleeve is pressed into the first mounting hole, and the second threaded sleeve is pressed into the second mounting hole; press-in states of the first screw sleeve and the second screw sleeve are obtained; when the press-in state is that detection is passed, a first screw is sequentially screwed into a first connecting hole and a first screw sleeve, and a second screw is sequentially screwed into a second connecting hole and a second screw sleeve; obtaining screwing-in states of the first screw and the second screw; when the screwing-in state is that the detection is passed, the pin shaft and the pin head are locked; and the assembled quick-assembly part assembly is moved to a material containing disc. The method has the advantages that the problems that follow-up assembly materials are wasted and finished products are unqualified in batch due to the fact that hidden defects of the previous procedure are difficult to find in time are solved, and the production yield is increased.

The application provides a urea nozzle cooling system, an engine assembly and a vehicle, and belongs to the technical field of engines, and comprises a water pump and a urea nozzle assembly; the water pump is connected to the outer wall of an engine, a liquid taking pipe and a pumping pipe are connected to the water pump, and the liquid taking pipe is connected to the bypass outlet of the cooling liquid of the engine; the urea nozzle assembly is connected to the exhaust manifold of the engine and connected to the pumping pipe, a liquid returning pipe is connected to the urea nozzle assembly, and the liquid returning pipe is connected to the bypass inlet of the cooling liquid beside the bypass outlet of the cooling liquid. The urea nozzle cooling system provided by the application connects the liquid taking pipe and the liquid returning pipe to the pumping pipe through integrated supports to form an integrated pipeline, and arranges the bypass outlet of the cooling liquid and the bypass inlet of the cooling liquid close to each other, so that the length of the pipeline can be shortened, the integrated pipeline can be connected to the engine with the help of at least one integrated support, the difficulty of disassembly and maintenance can be reduced, and the integration and light weight of the overall structure of the engine are promoted.

The utility model relates to a self-conduction device, in particular to a well-entering circuit self-conduction device for oil and gas well perforation, and solves the problems that an existing perforation device is in a power supply to-be-excited state before perforation operation and cannot meet certain specific process and environmental condition requirements. Comprising a joint, an upper conductive core-passing member, an elastic on-off unit and a lower conductive core-passing member. The upper conductive core-passing member and the lower conductive core-passing member have the same structure, and each of the upper conductive core-passing member and the lower conductive core-passing member comprises an insulating shell, a contact and a conductive rod. A mounting hole is formed in the position, corresponding to the gap, of the side wall of the connector in the radial direction, and the mounting hole communicates with the through hole. A mounting cavity is formed in the side, opposite to the mounting hole, of the inner wall of the connector, the mounting hole, the through hole and the mounting cavity form a mounting space, and the elastic on-off unit is arranged in the mounting space. According to the utility model, the elastic on-off unit is used for realizing an open-circuit state before reaching a target stratum and an on-state after reaching the target stratum.