40results about How to "Change preload" patented technology

The invention discloses a key switch capable of adjusting pressing hand feeling, and an adjustment method of the key switch. The key switch comprises a substrate, an upper cover, an upper sleeve part,a key cap, a lower sleeve part and a reset assembly; the substrate has an electrode module; the upper cover is arranged on the substrate; the upper sleeve part is movably arranged on the upper cover;the upper sleeve part has a key cap connecting part; the key cap can be combined with the key cap connecting part; the lower sleeve part is movably arranged between the substrate and the upper cover;the lower sleeve part can rotate left and right relative to the substrate to be switched between a first angle position and a second angle position; the lower sleeve part has a first perpendicular side surface and a second perpendicular side surface; the first perpendicular side surface and the second perpendicular side surface are different in appearances; and the reset assembly is arranged between the substrate and the lower sleeve part. According to the key switch disclosed in the invention, a concave-convex structure is designed between the upper sleeve part and the lower sleeve part, sothat the key switch can have hand feeling states of different feedback forces in the same trigger travel by changing the pre-pressing quantity of the reset assembly.

The invention discloses a belt-type under-actuated three-joint mechanical finger structure and an operation method thereof. The structure comprises three-joint finger mechanisms with an under-actuatedstructure. Three three-joint finger mechanisms are evenly distributed on an upper base to form a palm-shaped actuating device and every two of the three three-joint finger mechanisms make a 120-degree angle; a lower base is arranged below the upper base; a step motor is arranged in the lower base; the step motor is connected with one end of a worm via a coupling; the other end of the worm is connected with the upper base; a worm gear is arranged in each of the three-joint finger mechanisms and the worm matches with the worm gears to rotate; power is transmitted to the three-joint finger mechanisms via a synchronous pulley which rotates synchronously with the worm gears; and grabbing and releasing of an object to be grabbed is thereby realized. The structure is simple, the transmission ratio is higher, the transmitting torque is increased, the rotating precision is improved and the control is more convenient.

The invention discloses a football launching device for training. The football launching device comprises a base, wherein the base is provided with a left side plate and a right side plate; a left connecting piece is hinged to the left side plate; a right connecting piece is hinged to the right side plate; vertical angle adjustment of the left connecting piece and the right connecting piece is performed through a vertical angle adjusting mechanism; the bottoms of the left connecting piece and the right connecting piece are provided with guide rails; an impact mechanism is arranged between theleft connecting piece and the right connecting piece; the impact mechanism comprises an outer frame; a first telescopic rod is fixed in the outer frame; the periphery of the first telescopic rod is sleeved with a spring; the front end of the first telescopic rod is provided with a positioning mechanism; the front part of the outer frame is provided with a guide hole; a push rod is arranged in theguide hole in a penetrating way; the outer end of the push rod is provided with an impact plate; the end, positioned inside the outer frame, of the push rod is provided with a limiting rod and a stress rod; the top of the outer frame is provided with a chain transmission mechanism; and the chain transmission mechanism is provided with a pull rod. The football launching device can improve the goalkeeping training effect for goalkeepers, has the advantage of saving time and labor, and can improve the training efficiency.

A bearing system for supporting components that are movable relative to one another includes at least one bearing and a preload mechanism for changing a preload of the at least one bearing based on an operating state of the bearing system, where the preload mechanism includes, for example, a piezoelectric element, a Peltier element, an expansion material or a micromechanical element.

The invention relates to the technical field of hanging frames, in particular to an underground pipeline hanging frame system. The underground pipeline hanging frame system comprises a hanging seat and a pipeline clamp. A frame body is connected with the lower side of the hanging seat. The lower end of the frame body is connected with a rapid insertion device. The rapid insertion device comprisesa connection base, a plurality of wedge blocks, a locking sleeve and an unlocking sleeve. The wedge blocks are rotationally connected to the upper end of the connection base. The locking sleeve and the unlocking sleeve are sequentially and rotationally arranged on the outside of the outer circle face of the connection base in a sleeving manner from top to bottom and correspond to the wedge blocks.The pipeline clamp is inserted into the connection base from the lower end. The locking sleeve and the unlocking sleeve cooperatively rotate and drive the outer ends of the wedge blocks to rotate, sothat the inner ends of the wedge blocks rotate into or retreat out of the pipeline clamp, and then the pipeline clamp and the rapid insertion device are mutually locked or loosened. According to theunderground pipeline hanging frame system, by arranging the rapid insertion device, when the pipeline is assembled or disassembled, it is just needed to cooperatively rotate the locking sleeve and theunlocking sleeve, disassembling bolts is not needed on a construction site, rapid assembly and disassembly of the pipeline clamp can be achieved, and convenience and rapidness are achieved.

The invention relates to a coulomb damper, belonging to the technical field of damping vibration absorbers. The coulomb damper comprises a housing seat, wherein a pair of frustum mounting seats is mounted in the housing seat; damping pairs are mounted in tapered holes of the frustum mounting seats; center shafts penetrate through the centers of the damping pairs; the two frustum mounting seats are mounted in an inner hole of the housing seat with the large ends of the tapered holes opposite to each other; an adjustment interval is reserved in the inner hole; damping pressure springs are mounted between the two pairs of damping pairs; the housing seat consists of an upper housing, a lower housing and a ball seat; the upper housing and the lower housing are provided with inner ball concaves; a spherical hinge structure is formed by the upper housing, the lower housing and the ball seat; and a ball seat center penetrable hole is provided with adjustment threads for mounting the frusta mounting seats. The coulomb damper completely eliminates damping waves and has ideal following character; the phenomenon of dead lock is avoided; and the axial size of the coulomb damper is significantly reduced; the structure is very compact; and the operation is very convenient.

An interval constant-force device capable of realizing stepless adjustment comprises a rope used for transmitting tension, a spring barrel, a spring shaft, a spring and an adjusting mechanism; the center end of the spring is connected to the spring shaft; the outer end of the spring is connected to the inner wall of the spring barrel; a cam is fixedly connected to one side of the spring barrel; one end of the rope is fixedly connected to the cam and is connected with an external stress mechanism after bypassing the cambered surface of the cam; the tightening degree of the spring is increased when the rope pulls the cam and the spring barrel to rotate around the spring shaft, and meanwhile, the corresponding radius vector on the cam is increased, so that the tension transmitted by the ropeis kept constant; the adjusting mechanism comprises a motor, a motor driver and a worm gear and worm reducer; the output end of the motor is connected with the input end of the worm gear and worm reducer; and the output end of the worm gear and worm reducer is connected with the spring shaft through a connecting assembly. According to the device, stepless adjustment of the tension on the cervicalvertebra of a patient can be realized, and the tension most suitable for the neck of the patient can be found.

The invention provides an unloading powder laying mechanism on 3D printing equipment, and belongs to the technical field of 3D printing systems. The unloading powder laying mechanism comprises a mounting base, wherein a base table is fixedly connected to the left side of the mounting base, a rotating shaft is rotationally connected to the inner side of the base table, a core shaft is inserted into the left side of the rotating shaft, a powder spreading arm is fixedly connected to the outer side of the core shaft, and the outer side of the bottom of the powder laying arm is fixedly connected with a clamping cutter. The problems that a core transmission module is damaged due to the occurrence of conditions during the powder laying action of equipment, laser still has the sintering risk when a powder laying mechanism is damaged, and maintenance and replacement are troublesome due to the fact that the core shaft and the rotating shaft are connected through screws are solved. According to the invention, the load borne by a powder laying knife exceeds a preset value, when an unloading protection action occurs, the rotating shaft shields a proximity probe, and the proximity probe outputs an alarm signal to a host, so that the transmission module can be effectively prevented from being damaged, troubleshooting work is facilitated, and an effective prevention and protection effect is achieved in allusion to sudden and abnormal conditions.

The invention discloses a novel composite proportional electromagnet comprising a shell, a magnetic isolating ring, an armature, a left cover plate, a left pressure regulating nut, a right cover plate and a right pressure adjusting nut, wherein the magnetic isolating ring is sheathed in the shell; the armature is located in the magnetic isolating ring; the left pressure regulating nut is connected to a right end of the armature; the left cover plate is fixed on a left end of the shell; the right pressure adjusting nut is connected to the right end of the armature; and the right cover plate is fixed on the right end of the shell. According to the novel composite proportional electromagnet disclosed by the invention, the traditional magnetic isolating ring structure is replaced by a thin-walled structure, thereby simplifying the system structure, reducing the processing procedures and improving the production efficiency; the end face of the armature is changed to improve the electromagnetic attraction and improve the output force characteristics; and the pre-tightening forces acting on the two ends of the armature can be conveniently adjusted through pressure regulating springs to realize the adjustability of the acting force of the proportional electromagnet at a certain voltage or current. The novel composite proportional electromagnet disclosed by the invention is simple in structure, convenient to use and excellent in performance, can realize bidirectional displacement output, and can be directly connected with a valve core of a slide valve so as to control the bidirectional position proportion of the valve core of the slide valve.

The invention discloses a revolution speed detection device, and relates to the machining apparatus; the revolution speed detection device mainly comprises a support, a rolling portion, a slide portion and a counting portion; the rolling portion comprises a mount seat, a slide block, a first roller and a second roller; the slide portion comprises a slide seat and a slide bar; the mount seat and the slide seat are connected on the support in a slide manner; the slide block is connected on the mount seat in a slide manner; the first roller is connected on the mount seat in a rotary manner; the second roller is connected with the slide block in a rotary manner; a first spring is arranged between the support and the mount seat; a second spring is arranged between the slide block and the mount seat; the slide bar is arranged above the first and second rollers; two ends of the slide bar are respectively provided with a first control switch and a second control switch; the slide bar impacts the first control switch and tightly attaches to the first roller; the slide bar impacts the second control switch and tightly attaches to the second roller; the slide bar can measure the linear speed of the first and second roller edges, and the measuring result is not affected by the first and second roller grinding.

The invention relates to a monolithic insulation test tool for the carbon ceramic linear resistor; the test tool comprises a cavity, a main body part with an opening at the upper end and an upper cover for closing the opening at the upper end, the main body part and the upper cover are matched to form a closed air chamber, and the cavity is provided with an inflation inlet communicated with the air chamber; the main body part comprises a conductive supporting part for upwards supporting the monolithic resistor; the test tool comprises a wiring part connected with the conductive supporting part; the test tool further comprises an upper wiring terminal fixedly arranged on the upper cover, the upper wiring terminal comprises a middle electric conductor and an insulator fixedly arranged outside the electric conductor, the electric conductor downwards penetrates into the air chamber, and the insulator is used for being connected with the upper cover in a sealed mode. The test tool further comprises an elastic conductive piece arranged below the conductor, and the elastic conductive piece comprises a spring which directly or indirectly elastically presses the single resistor sheet and is conductively communicated with the single resistor sheet.

The invention discloses a hydro-generator temperature control system used for hydroelectric power generation. The structure of the system comprises an adjusting rotation shaft, an acousto-optic alarm,a temperature controller, an LED display, a bellows casing, an amplitude difference spring sleeve and a keyboard. According to the invention, an indirect method is used to measure the temperature ofthe rotor of a generator; a shunt, a current transducer and a voltage transducer are arranged to measure the temperature of the rotor of the generator; the measured current and voltage values pass through the temperature controller, and the measured temperature is transmitted to a processor for analysis and calculation; the temperature of the generator is controlled; embedding temperature measuring resistors in the whole rotor is avoided; the hidden danger of the safe operation of the generator is effectively avoided; the system has the advantages of simple operation and high practicability; the temperature controller can carry out remote communication to realize real-time monitoring of the temperature control of the generator; and the service life of the generator is effectively improved.

The invention aims at providing a combined mechanical fuel oil injection and pressurizing piezoelectric fuel gas injection mixed fuel injection device. The mixed fuel injection device comprises a fuel gas pressurizing part, a pressure adjusting spring, a piezoelectric control part, a mechanical nozzle, a fuel gas nozzle, a fuel gas inlet channel, a fuel oil inlet channel and the like. A pressurizing electromagnetic valve is adopted by the fuel gas pressurizing part to control motion of a pressurizing piston to achieve fuel gas pressurization, fuel gas pressurizing timing is controllable, switching of fuel gas pressurizing injection and fuel gas non-pressurizing injection can be rapidly achieved, and the different requirements of different powers of a dual-fuel engine on fuel gas injection pressure are met; the mechanical nozzle is used for achieving fuel oil injection, a piezoelectric element is adopted by the piezoelectric control part to control the fuel gas nozzle to achieve fuel gas injection, the flexibility of fuel injection is high, and switching of pure fuel oil injection and fuel oil and fuel gas dual-fuel injection can be achieved; fuel oil in a needle valve cavity of the fuel gas nozzle and fuel oil at needle valve matching parts of the fuel gas nozzle are the same oil, the oil pressures are equal, and static leakage of the fuel oil at the needle valve matching parts is avoided.

The invention relates to a control valve assembly comprising a valve body which is prestressed in a direction by a control spring assembly. The spring preload of the control spring assembly (12, 62) can be adjusted by an adjusting device (5, 7) which is completely accommodated in the valve box (2) or a fitted housing part.

The invention discloses a walking auxiliary device, and belongs to the technical field of auxiliary tools. The walking auxiliary device comprises a walking frame, rollers are mounted at the bottom ofthe walking frame, each of the two sides of the walking frame is provided with a set of supporting rods, each set of supporting rods comprises two vertically-arranged supporting arms and a transversely-arranged connecting arm, the connecting arm is connected to the upper ends of the two supporting arms, the supporting arms are vertically and slidably installed on the walking frame, an anti-skid block is mounted at the end part of each supporting arm, each set of supporting rods is provided with a handrail rod, the two ends of the handrail rod are fixed between the two corresponding supportingarms, the handrail rod is provided with a guide rod extending vertically, a guide sleeve is arranged at a position, corresponding to the guide rod, of the walking frame, the guide rod is inserted intothe guide sleeve, and a reset spring is arranged between the guide rod and the guide sleeve. The walking auxiliary device solves the technical problems that existing walking vehicles are inconvenientto move, difficult to position and inconvenient to use, and is widely applied to walking auxiliary tools.

The invention discloses a cleaning and disinfection device for medical tools, and relates to the field of cleaning devices. The device is simple in structure and convenient to use, containers can be specially cleaned, and can be automatically classified according to the sizes of the containers; the distance between limiting rollers on the two sides at the inlet position is larger than the distancebetween the subsequent limiting rollers, so that feeding is convenient; a dividing baffle can be used for shielding; the side of a pushing plate, near to a rotating platform, adopts an arc structure,so that a certain centring function is realized during pushing, the device is more stable; a pushing baffle ring is in threaded connection with a horizontal push rod, so that the position of the pushing baffle ring on the horizontal push rod is adjusted, further, the beforehand tightened quantity of a pushing spring is changed, and the use is more convenient.

The invention discloses a knob switch used for researching human-computer adaptability and a measurement method of the knob switch. The knob switch comprises a knob rod, wherein a fixed sleeve is arranged outside the knob rod, a shell is arranged outside the fixed sleeve, a knob cover support is arranged at an upper part of the knob rod, a range dial is fixed by the fixed sleeve and the shell, a pre-tightening sleeve is arranged at a lower part of the knob rod, and an elastic part is arranged between the knob rod and the pre-tightening sleeve. By the knob switch, a knob cover can be conveniently replaced according to a demand, and the adjustment of the diameter size of a knob control part is achieved; by arranging the range dial, the range dial is arranged below the knob support, and a rotation angle range can be measured on the range dial by an initial positioning line on the knob support after the knob cover is rotated; and the angle positions of uniform angle holes of the knob rod and a ball on the shell can be changed by rotating the knob cover, so that the torsional deformation angles of an upper torsional arm and a lower torsional arm of a torsional spring are changed, and the adjustment of the torque of the knob switch is achieved.

The present invention relates to a device for supplying fuel of an internal combustion engine. Each injection valve disposed for each cylinder of the internal combustion engine has at least one flow channel 18 connecting to an injection hole forming part connectable to a pressure conduit capable of supplying fuel with a pressure source. The flow channel 18 penetrates through at least one closed body 35, and the closed body 35 can be energized to a seating part 38 due to the action of a force of a spring 45 and can be lifted from the corresponding seating part 38 by the fuel having a fuel pressure achieving to a certain set value. At this time, a force applied from a control piston 46 onto the closed body 35 is larger than a force applied onto the closed body 35 by fuel pressure in an usual opening pressure time and smaller than a force applied onto the closed body 35 by the highest limit fuel pressure, so that good behavior in partial load can be easily realized.