148results about How to "Easy maintenance inspection" patented technology

The invention relates to an explosion-proof fire-fighting detection robot, and belongs to the field of special robotic devices. The explosion-proof fire-fighting detection robot is characterized by comprising a mobile carrier, a control box, a power supply box, a line collection box, an outer cover and a detector, wherein the control box and the power supply box are arranged on the mobile carrier side by side from front to back; the line collection box is arranged on the power supply box; the outer cover is matched with the mobile carrier to cover the control box, the line collection box and the power supply box; the detector is arranged outside the outer cover; the mobile carrier, the control box, the power supply box, the line collection box, the outer cover and the detector are all made of explosion-proof materials or adopt mature explosion-proof components. The explosion-proof fire-fighting detection robot is compact in structure, and convenient to operate and control; a crawler-type walking mechanism and an overturning mechanism are adopted, so that the explosion-proof fire-fighting detection robot can better adapt to a poor working environment; the modularization design is adopted, so that the explosion-proof fire-fighting detection robot is convenient to detach, maintain and check; the explosion-proof function integrates with such functions as environment perception and detection, so that the explosion-proof fire-fighting detection robot can be better qualified for the special fire-fighting work.

A magneto-rheological damper comprises a cylinder barrel, a left end cap, a piston rod, a piston, a right end cap, a connecting barrel, a winding barrel, a coil, an external guide magnet and a cap nut. The magneto-rheological damper has the advantages that the coil slides on the cylinder barrel in the direction identical with motion direction of the piston rod, so that a magnetic core on the piston and the external guide magnet are always guaranteed to form a closed magnetic loop, flow guiding can be functioned by an axial central hole and a radial hole in the piston, and magneto-rheological fluid viscosity can be changed by changing the size of the holes during working of the damper, and further, high-viscosity damping force can be generated. The coil is arranged outside the cylinder barrel, convenient for winding, convenient to maintain and check and good in sealing performance. By directly inflating the damper, extra purchasing an energy storage device is omitted, and the magneto-rheological damper has high applicability. Since the magneto-rheological damper is good in damping property, the magneto-rheological damper can be mounted on mechanical structures required to be damped, such as suspension damping of automobiles, damping of undercarriages of planes, damping of seats and bridges.

The invention discloses an examination couch with a protective device, which comprises a horizontal part and a vertical lift part, wherein a bottom cover is arranged under the horizontal part, the edge of the upper part of the bottom cover is provided with touch sensors, each touch sensor is connected with a drive motor of the vertical lift part so as to control the rotation of the motor, and the touch sensors are microswitches. The examination couch with the protective device, which is provided by the invention, is provided with the touch sensors at the edge of the upper part of the mobile bottom cover. The bottom cover can be lifted so as to trigger the touch sensors when the design resistance of the touch sensor overcomes the gravity of the bottom cover, and the touch sensors immediately send blackout signals to the vertical motor to stop the rotation of the motor so as to stop the vertical motion of examination couch, so that the examination couch as well as devices and maintenance staffs capable of being pressed by the examination couch can be protected to the maximum extent. Moreover, the examination couch with the protective device has the advantages of lower design cost, simplicity and reliability in function, and easiness in maintenance.

The invention relates to a high-voltage distribution box based on a vehicle-mounted CAN bus network. The high-voltage distribution box comprises a high-voltage distribution box body, a high-voltage power supply part and a low-voltage control part, wherein the high-voltage distribution box body comprises a high-voltage distribution box housing and an insulating terminal; the high-voltage power supply part comprises a high-voltage connector socket, a copper bar, contactors, a pre-charge resistor, fuses, a maintenance switch and a high-voltage interface; the low-voltage control part comprises a low-voltage wire harness, a high-voltage distribution box control panel and a low-voltage interface. The high-voltage distribution box has the following superior effects: communication with a vehicle control unit is realized by a CAN bus, so that opening / closing of the contactors can be directly controlled; the CAN bus is excellent in anti-interference performance and stability and high in transmission rate; the high-voltage distribution box has the functions of low-voltage protection, overcurrent protection, starting current limitation, insulating detection, switch maintenance, fault code diagnosis, CAN communication and the like, effectively guarantees the vehicle and personal security and ensures normal running of the vehicles.

A flat-board-like high frequency antenna conductor (13) is arranged on a flange, which also serves as a part of a vacuum container and has a rectangular opening section, so as to cover the opening section by sandwiching an insulating glass frame body surrounding the opening section. A high frequency power supply is connected to the high frequency antenna conductor at one end thereof along the long side, with a matching box therebetween, and the other end is grounded, then, power is supplied so that a high frequency current flows from the one end to the other end of the high frequency antenna conductor. Thus, impedance of the high frequency antenna conductor is reduced and high density plasma at a low electron temperature can be efficiently generated.

The invention discloses an assembled-type externally-restricted buckling-restrained supporting component, which comprises an externally-restricted steel pipe and a core-material steel pipe, wherein a non-cohesive material layer is arranged between the externally-restricted steel pipe and the core-material steel pipe, the externally-restricted steel pipe is equally arranged into two externally-restricted steel-pipe split bodies, the two externally-restricted steel-pipe split bodies are spliced into a whole through connecting bolts, and two gaskets are respectively arranged between the splicing ends of the two externally-restricted steel-pipe split bodies; and in addition, the space between the externally-restricted steel pipe and the core-material steel pipe is 1-2mm, and the thickness of the non-cohesive material layer is adapted to the space between the externally-restricted steel pipe and the core-material steel pipe. Therefore, under the condition of ensuring better earthquake-resisting and energy-consuming performances, in order to consider the convenient replacement and installment of the assembled-type externally-restricted buckling-restrained supporting component, the assembled-type externally-restricted steel pipe is adopted.

The invention relates to a multiple-protection high-voltage distribution box applied to a new energy automobile. The high-voltage distribution box comprises a high-voltage distribution box body, a high-voltage power supply part and a low-voltage control part; the high-voltage distribution box body is composed of a high-voltage distribution shell and insulation terminals; the high-voltage power supply part is composed of a high-voltage connector socket, a copper bar, contactors, a precharge resistor, fuses, a service switch and high-voltage connectors; the low-voltage control part is composed of relays, low-voltage wiring harnesses, low-voltage wiring harness transfer boards and a low-voltage connector. The multiple-protection high-voltage distribution box applied to the new energy automobile has the advantages that the high voltage is controlled through the low voltage, the contactor is controlled through the corresponding relay for each circuit, and direct control over the contactors is avoided; by means of multi-layer isolation of the relays and the contactors, a human body can not make contact with the high voltage directly, and use is safer.

The invention provides a modularized ocean energy power generation device. The modularized ocean energy power generation device comprises an outer framework, at least one inner framework and at least one hydraulic turbine generator module, wherein at least one inner framework can be separably arranged in the outer frame. At least one hydraulic turbine generator module is arranged in the inner framework. The modularized ocean energy power generation device is provided with at least one internal module, and the hydraulic turbine generator modules can form arrayed arrangement by regulating number of the internal modules. The inner framework and the outer framework can be separably arranged, so that the modularized assembly is realized, and the maintaining and mounting cost is greatly reduced.

Respective positive terminal electric potentials of exhaust gas sensors are sequentially selectively inputted to an analog input terminal of a multi-channel AD converter through a multiplexer. An offset voltage is applied to respective negative terminals of the exhaust gas sensors. This offset voltage is inputted to another input terminal of the multi-channel AD converter. A microprocessor detects a generating voltage of the exhaust gas sensors by the difference between a digital converting value of the positive terminal electric potential and a digital converting value of the negative terminal electric potential. The microprocessor also individually judges that each of the digital converting values is excessively small and excessively large. Thus, the microprocessor judges the existence of ground, sky short circuit and disconnection abnormalities of the negative terminal and the positive terminal.

The invention discloses a dust-collecting grinding mobile purifier. According to the product, floating dust is ground and inhaled by an electric or pneumatic grinder (1); the inhaled floating dust is filtered by a stainless steel screen filter layer (5); and after hydrolysis filtration treatment is carried out through microporus sponge (8) of a hydrolysis filtration chamber (7), cleaned gas can be discharged safely. By a soft-brush filtration method for removing coarse dust and by a hydrolysis filtration method of removing micronic dust, the inhaled floating dust is processed comprehensively so as to achieve no floating dust in a work environment and discharge purified pollution-free air. The design almost can be used in all dedusting fields, and has advantages of high efficiency and low cost. The dust-collecting grinding mobile purifier is one of the most effective technologies in removing micronic dust and floating dust and eliminating environmental problems caused by haze.

The invention discloses a remote tower crane monitoring circuit with a self-diagnostic function. The remote tower crane monitoring circuit comprises a plurality of sensors, a sampling circuit, a main control circuit, a display circuit, an alarming circuit, a relay driving circuit and a GPRS (General Packet Radio Service) wireless communication module, wherein the main control circuit comprises a central processing unit and a self-diagnostic circuit; each sensor is connected with the sampling circuit; the sampling circuit and the display circuit are connected with the central processing unit of the main control circuit; the alarming circuit and the GPRS wireless communication module are connected with the self-diagnostic circuit of the main control circuit; the sensors comprise a weighing sensor, a rotary sensor, an amplitude variation sensor, a height sensor, an airspeed sensor, a voltage sensor, a current sensor and a temperature sensor. The tower crane remote monitoring circuit with the self-diagnostic function has the advantages that the remote monitoring on an operation state of a tower crane can be realized, the operation safety and reliability of the tower crane are improved, and the like.

The invention relates to a heat pipe type impinging stream grain dryer. The heat pipe type impinging stream grain dryer comprises a feed port, a discharge port, sliding ways, an air cavity, a heat pipe heat exchanger, air ducts and draught fans. Each sliding way comprises an internal sliding way cavity and a small hole array at the upper portion of the sliding way cavity. The sliding way cavities are communicated with the air cavity. The air cavity is communicated with the air ducts. Inlets of the air ducts are provided with the draught fans. After to-be-dried grains enter the dryer through the feed port, the grains fall into the sliding ways, slide downwards along the sliding ways, and are discharged from the discharge port; and in the downward sliding process, the heat pipe heat exchanger transfers heat to air in the air ducts, and the heated air is fed into the air cavity through the draught fans, enters the sliding way cavities, and flows out from the small hole arrays at the upper portions of the sliding way cavities to dry the grains. The novel impinging stream drying principle is adopted in the dryer, hot air flows upwards, the grains flow downwards, impinging streams are formed to generate the optimal drying effect on the grains, a temperature field is more uniform and more efficient, mechanical parts are omitted, the structure of the dryer is more compact, and energy consumption is greatly reduced.

The invention discloses a self-resetting energy dissipation connection device, is suitable for seismic designing and seismic strengthening of bridge and building structures, and belongs to the field of bridges and buildings. The device is located between a bridge beam body and pier. A spring is arranged at the center inside the device. Soft steel energy dissipation rods are arranged on the both sides of the spring separately. The outer side of the device is provided with a slidable nested structure formed by outer limit plates and inner limit plates. The excessive displacement is prevented from being generated by using the elastic restoring force of the spring, the plastic hysteretic deformation energy dissipation principle of the soft steel energy dissipation rods, and the slidable nested structure, part of the deformation of the structure is restored, and thus the deformation of bridge nodes is restrained. By taking displacement as the excitation source, the device can not only dissipate energy input into the structure by earthquakes, but also has very good limiting and self-resetting functions, which can better meet the requirement of limiting seismic deformation of the structure, and technical supports are provided for post-earthquake structure repairing and strengthening and emergency use. The self-resetting energy dissipation connection device has the advantages of low cost, low technical requirements, good durability, and convenience in maintenance and inspection.

The invention discloses an urban rail vehicle wiring method based on an EPLAN platform. The urban rail vehicle wiring method includes disintegrating a general electrical theory drawing of a whole train into different parts of local electrical theory maps by EPLAN software, establishing general drawing theory database and local map wiring database, generating a wire size list file by templates, converting the wire size list file into an excel format wire size list, checking duplicate and deleting to obtain the wire size sequencing list of the integral train and various types of carriage vehicle wire size lists, acquiring various carriage vehicle wire size sequencing lists by importing and exporting the templates, verifying various types of carriage vehicle wire size sequencing lists, correcting different types of carriage vehicle wire size sequencing lists according to respective wire size problem lists and terminal problem lists so as to obtain different types of carriage vehicle wiring files, and wiring for various carriages. Operation efficiency is improved, mistaken wiring and debugging workload are reduced, and materials, time and labor cost are reduced.

There is provided a high pressure sealing apparatus including: a top adapter including a packing receiving recess having an inverted V-shaped section; a bottom adapter including a packing supporting wall having an inverted V-shaped section; packing members each having an inverted V-shaped section, and interposed between the top adapter and the bottom adapter; and backup rings each having an inverted V-shaped section, and alternately overlapped with the packing members. The packing members are made of hard synthetic resin. A deformation allowing gap is formed on at least two facing walls of a top wall or a bottom wall of the packing member, and a bottom wall of the top adapter, a top wall and a bottom wall of the backup ring, or a top wall of the bottom adapter to be closed owing to compaction force in an axial direction X.

The present invention provides a manufacturing method of an oxygen sensor connector and a connector. The manufacturing method comprises the following steps of: detecting of a resistance value of a variable thick film resistance sheet, and dispensing a soldering flux of soldering points of the resistance sheet; performing 90-degree bending and blanking of a terminal; performing hot pressure weldingof the variable thick film resistance sheet and the terminal; and performing dispensing of a plastic component, assembling the terminal to the plastic part and performing UV light irradiation and solidification, performing detection of the resistance value of the variable thick film resistance sheet once again, and allowing qualified connectors to roll off the production line to packing tubes forpacking. The connector manufactured by employing the method comprises a plastic part terminal and a variable thick film resistance sheet, and the plastic part is provided with bayonets and openings corresponding to the terminal in shape, and is also provided with a notch corresponding to the resistance sheet in shape; the terminal is in welding connection with the variable thick film resistance sheet and are arranged at the outer surface of the plastic part so that the whole connector structure is clear at a glance, maintenance and checking in future are convenient, position steadiness of thevariable thick film resistance sheet is ensured, and the variable thick film resistance sheet is not easy to fall off.

The invention discloses a four-quadrant hydraulic loading system. A port A and a port B of a volume adjustable hydraulic pump / motor are separately connected to a port T and a port P of a manual reversing valve; a port A and a port B of the manual reversing valve are separately connected to a port A and a port B of a three-position four-way electromagnetic reversing valve, and the port B of the manual reversing valve is also connected to a port P of a pilot proportional electromagnetic overflow valve; a port A of the pilot proportional electromagnetic overflow valve is successively connected to a port P of the three-position four-way electromagnetic reversing valve through a cooler and a filter; a port T of the three-position four-way electromagnetic reversing valve is connected to a port A of a pilot pressure reducing valve and a port AA of a first one-way valve; a port P of the pilot pressure reducing valve and a port P of the first one-way valve are connected to an energy accumulator through a manual stop valve; and the port P of the three-position four-way electromagnetic reversing valve is successively connected to a fuel tank through a second one-way valve and a hydraulic pump. The four-quadrant hydraulic loading system disclosed by the invention adopts a closed hydraulic system and has the characteristics of high efficiency and high power density, and the closed system has the advantages of small size, small occupied area and low cost.

The invention discloses a pin inserting machine achieving automatic forming. The pin inserting machine comprises an operating platform, and a pressing assembly, a forming assembly, a push assembly and an installation assembly are arranged on the operating platform. A driving air cylinder for driving all the assemblies is further included. An untreated bent copper wire is pressed to be straight through the pressing assembly, and then is fed into the forming assembly, the copper wire is pressed to be in a U shape through the forming assembly, the U-shaped copper wire is pushed into the installation assembly through the push assembly, and the copper wire is installed in a framework through the installation assembly. The pin inserting process is fully automatic, production efficiency is improved, the various processing processes such as U shape forming, feeding, pressing installation and discharging of the wire can be integrally completed simply by clicking a switch, and operation convenience is improved. All the assemblies are easy to install, and maintenance and inspection are facilitated.

The invention provides a movable folding type multifunctional garage, comprising a shelter ceiling, a garage base and a support hydraulic cylinder; the movable folding type multifunctional garage comprises a shelter ceiling and a support hydraulic cylinder. The upper side of the garage base is covered with a shielding ceiling; A support cushion plate is arrange on one side side wall of that garagebase; The other side of the garage base is provided with an oil pump device and a power control box; Six moving wheels are symmetrically arranged on the bottom side of the garage base; Four supporting hydraulic cylinders are symmetrically arranged on both sides of the garage base, and the supporting hydraulic cylinders are communicated with the oil circuit of the oil pump device; Four ceiling opening and closing motors are symmetrically arranged on both sides of the garage base. The multi-function garage of the movable folding type is provided with an aperture slot structure at the middle position of the garage base, and the aperture slot structure design is similar to the ditch structure design of the garage, and the design of the structure is conducive to the maintenance and inspectionof the vehicle bottom parked on the inner side of the garage through the aperture slot structure, thereby effectively increasing the use function of the movable garage.

The invention relates to a rectifier chamber cooling system and a method for cooling, air discharging and radiating of the same to ensure that a ventilating and cooling system tends to be reasonable.A rectifier chamber is provided with a basement which is provided with a natural air inlet; a roof of the rectifier chamber is provided with a mechanical air outlet; an underground of a pure water cooler fan is provided with a local basement 11 which is provided with an air inlet, and is provided with a mechanical air outlet through the pure water cooler fan; and an outdoor ventilation and air inlet pipe is communicated with the basement. By comprehensively utilizing cooling equipment and adopting the good cooling and ventilating system, the method for cooling rectifier equipment in a rectifier station is more scientific, reasonable, energy-saving and high-efficient and has good radiating effect. The rectifier chamber cooling system and the method solve the problems that the ambient temperature of the rectifier chamber is overhigh in a tropical zone, and the rectifier chamber requires to be cooled by an air conditioner when the condition is severe, and the like.

The invention discloses a bending and shearing separation type prefabricated assembly-type frame column and a construction method thereof. A column section comprises an upper column section body and alower column section body; the spliced position of the column section bodies is located at a bending moment anti-bending point; a horizontal bottom-end steel seal plate is pre-embedded in the bottomend face of the column section, and a downwards externally-protruding shear key is arranged on the lower surface of the bottom-end steel seal plate; a horizontal top-end steel seal plate is pre-embedded in the top end face of the column section, and a downwards internally-sunken shear key groove which is matched with the shear key is formed in the upper surface of the top-end steel seal plate; thebottom-end steel seal plate and the top-end steel seal plate are tightly attached; the shear key is downwards clamped into the shear key groove, and the shear key and the shear key groove are tightlymatched; and the top-end steel seal plate and the bottom-end steel seal plate are fixedly connected into a whole through an anti-bending piece. According to the bending and shearing separation type prefabricated assembly-type frame column, bending and shearing members are separated, the vertical bearing capacity of the frame column can be guaranteed, the anti-seismic requirement is met, the structure is simple, processing, construction and mounting are convenient, and meanwhile the economically feasible performance cost ratio is high.

The invention discloses a grinding device for rusted steel plates. The grinding device comprises a grinding frame, a chip storage box, a friction device, water spraying grooves, water spraying ports,a water pipe, a water tank, a clamping bolt, a fixing column, a motor, a rotating shaft, a telescopic column, a telescopic base, a rotating block, a grinding block, steel wire brush bristles and a collection port. The grinding device has the advantages that the telescopic base and the telescopic column are arranged in the friction device so that the friction device can freely adjust a clamping angle for grinding according to different thicknesses of the rusted steel plates. The water spraying grooves are formed in the two sides of the telescopic base, and the water tank for adding water is disposed on one side of the water spraying grooves, so that when the device is used, water is sprayed through the water spraying ports of the water spraying grooves for cooling and dedusting. The chip storage box is arranged below the grinding block; besides, the collection port which is of an arc-shaped structure is arranged above the chip storage box so that the chip storage box is more convenientand quicker to use when collecting steel plate chips through the collection port. The device has the advantages of being simple, convenient and more practical.

The invention provides a vertical ocean power generation device. The vertical ocean power generation device comprises a frame, a buoy platform, at least three water turbines and at least three power generation modules, wherein the buoy platform is arranged on one side of the frame; the at least three water turbines are arranged in the frame in parallel; the axial direction of the water turbines is perpendicular to the horizontal plane; the at least three power generation modules are mechanically connected with the three water turbines respectively and are arranged on one side, back on to the water turbines, of the buoy platform; when a water flow flows to the water turbines, the water turbines rotate to drive the power generation modules to generate power. According to the vertical ocean power generation device, the ocean energy can be effectively utilized to generate power. The equipment is simple and easy to maintain, and can be effectively put into large-scale production.

The present invention provides a separation type mild steel shock absorber. The separation type mild steel shock absorber comprises an upper shock absorber part and a lower shock absorber part which are symmetrically arranged relatively, wherein relative end portions of the upper shock absorber part and the lower shock absorber part have force transmission segments, and a gap is left between end surfaces of the two force transmission segments; a force transmission cylinder arranged outside the force transmission segments of the upper shock absorber part and the lower shock absorber part and capable of slidably connecting the force transmission segments of the upper shock absorber part and the lower shock absorber part; and a limiting steel pin arranged in the gap so as to limit the force transmission cylinder outside the force transmission segments.

The invention provides an air cylinder cover of an internal combustion engine and damage to a sealing gasket surface of the ari cylinder cover can be prevented during maintenance and check. A combustion chamber (34) communicated with an air inlet port (32) and an air discharging port (33) is disposed in the air cylinder cover (15) of the internal combustion cover; the sealing gasket surface (35) is arranged on the periphery of an opening part (34a) of the combustion chamber; an air cylinder body (12) is sealed via the sealing gasket surface; the combustion chamber (34) and the air cylinder (13) are arranged on the same axis; the air cylinder cover comprises an air inlet boss part (36) on the periphery of the air inlet port and an air discharging boss part (37) on the periphery of the air discharging port; and a lower protrusion part (36b) of the air inlet boss part protrudes toward the air cylinder body compared with the sealing gasket surface.

The invention discloses a non-damage energy dissipation prefabricated assembly-type frame structure system and a construction method thereof. The non-damage energy dissipation prefabricated assembly-type frame structure system comprises foundations, prefabricated frame columns connected with the foundations and prefabricated frame beams connected with the prefabricated frame columns, and further comprises energy dissipation dampers arranged between the interlayer prefabricated frame beams. The prefabricated frame columns and the foundations are connected through column foot connecting structures, the beams and the columns are connected through beam and column connecting structures, and the prefabricated frame columns are connected through column joint connecting structures. The shortcomings of an existing prefabricated assembly structure system are overcome, all joints adopt the ideas of bending and shearing separation, strong shearing and weak bending, and bending shearing elasticity,the anti-earthquake requirement is met, the structure is simple, processing is convenient, construction and mounting are convenient, and meanwhile the economically feasible performance cost ratio ishigh. The energy dissipation devices are further arranged, the viscous fluid dampers are arranged between the interlayer beams to conduct energy dissipation so as to increase the damping ratio of thestructure, the earthquake response of the structure is reduced, it is guaranteed that large earthquake members are not damaged, and thus repairing is avoided.

The invention discloses a twin-screw extrusion mechanism of a large-injection-volume extrusion-injection integrated injection molding machine. The twin-screw extrusion mechanism comprises a rack, a storage mechanism and an injection oil cylinder, wherein the storage mechanism and the injection oil cylinder are both installed at the top of the rack, and the rack is provided with a twin-screw extrusion device which reduces the occupied space and cost of the whole machine and meanwhile can assist in disassembly and maintenance. According to the twin-screw extrusion mechanism, the twin-screw extrusion device replaces an existing single-screw extrusion structure, so the occupied space can be greatly reduced, the cost of the whole machine can be reduced, and transportation and production can befacilitated; and meanwhile, an internally designed transmission mechanism can assist personnel in disassembling screw rods while meeting the requirement for providing rotating power for the screw rods, so maintenance and inspection are more convenient during long-term use of the screw rods, and the scrapping of the screw rods and a material barrel is avoided.

The invention discloses a fuel injector tightening structure, which comprises a fuel injector sleeve arranged on a cylinder cover and a camshaft framework fixed on the cylinder cover, wherein the bottom of the fuel injector sleeve is fixed on the cylinder cover, and the top of the fuel injector sleeve is matched with the camshaft framework; and a fuel injector is arranged in the fuel injector sleeve and is connected with the camshaft framework through a tightening threaded sleeve. Aiming at the defects that in the prior art, a connecting structure of the fuel injector and the cylinder cover iscomplex, the processing technique has high difficulties and the cost is high, the whole fuel injector tightening structure is simple and reliable and has good assembling property and manufacturability; besides, because a mounting hole of the whole fuel injector does not need to be casted on the cylinder cover, a cylinder cover die can be simplified and the processing technique of the cylinder cover can be optimized, thereby reducing the production cost and simultaneously providing convenience for maintenance overhaul. The fuel injector tightening structure can be widely applied to an engine with a four-valve twin overhead camshaft structure.

The invention provides a wheel assembly comprising a wheel seat, a wheel and a suspension mechanism. The suspension mechanism comprises a swing arm and a damper; one end of the swing arm and one end of the damper are in rotating shaft type connection, and the other ends of the swing arm and the damper are connected with a rotating shaft of the wheel seat; the wheel is fixedly connected to the swing arm; and when the wheel bears impact force in the direction perpendicular to the ground, the damper expands and retracts, the swing arm rotates around the connecting point of the wheel seat and theswing arm, and the wheel makes displacement in the direction perpendicular to the ground. The invention further provides a trolley comprising the wheel assembly. The wheel assembly and the trolley have the advantages of good pavement adaptability, ground-griping performance, damping effect and the like and besides have better comfort for a bearing material.