73results about How to "No torque" patented technology

The invention relates to a tensile test special fixture used for sheet metal or metal foil. The tensile test special fixture comprises an upper clamping head, a lower clamping head, two sets of guide post guide sleeves and threads through which the upper clamping head is connected with a stretcher stretching head base seat, wherein the upper clamping head comprises a T-type clamping component, a small clamping component and two pairs of bolts and nuts, and the upper clamping head is same to the lower clamping head in structure. Through holes are reserved in the upper clamping head and the lower clamping head along the direction parallel to the sample tensile direction, an upper guide sleeve is installed in the lower clamping head through hole, and the upper clamping head through hole is connected with the guide sleeves through guide posts. Bolt holes are reserved in the T-type clamping component and the small clamping component which are in the upper clamping head along the direction perpendicular to the sample tensile direction, and samples are clamped due to the fact that the two groups of bolts penetrate through the reserved holes of the clamping components. The tensile test special fixture used for the sheet metal or the metal foil is simple in structure and convenient to install and clamp, and overcomes various difficulties when the sheet metal and the metal foil are stretched.

The invention discloses a centralized driving flip-flow screen, which mainly comprises an upper screen box, a lower screen box, an elastic screen stencil formed by connecting a plurality of rectangular screen plates, a driving shaft for connecting the upper and lower screen boxes, a supporting frame, a driving shaft and a belt wheel driving mechanism, wherein the belt wheel driving mechanism is arranged at the middle lower part of the driving shaft, the middle part of the driving shaft is provided with a belt wheel connected with the belt wheel driving mechanism, and the axes at the left and the right of the belt wheel are symmetric and are machined with two eccentric axis sections respectively to form the coaxial four-section eccentric driving shaft; an upper cross beam of the supportingframe is a semi-columnar upper cross beam; the relative motion of the two screen boxes fulfills the deflection motion of the screen stencil so as to realize material screening; and the centralized driving flip-flow screen adopts the structure that the number of the screen hole of the screen surface at the front end is less, the number of the screen hole of the screen surface at the middle sectionis medium and the number of the screen hole of the screen surface of the tail section is more in the aspect of the screen hole arrangement so as to ensure the effects that the screen surface at the front end is not easy to break when conveying the materials and the integral screen surface screens uniformly; and the centralized driving flip-flow screen has the advantages of simple structure, stableoperation, energy consumption conservation, long service life and wide practicability.

The invention relates to a linear motion actuator combined by the fluid drive and the lead screw nut device, which comprises a fluid drive cylinder, a lead screw nut mechanism, a motor, a speed reducer, an electromagnetic brake and a photoelectric sensor. Therefore, a linear motion execution and control unit integrating the fluid, optics, machinery and electronic functions is formed, which can conveniently realize the speed and position control of the linear motion of the high comprehensive index precision.

A rotorcraft is disclosed. The rotorcraft may include a rotor having at least one tip nozzle, a compressor having an outlet for compressed air, and a network of conduits connecting the outlet of the compressor with the tip nozzle. In operation, the compressor may deliver a flow of compressed air to the tip nozzle. As the flow of compressed air exits the at least one tip nozzle, it may cause rotation of the rotor. This rotation may prerotate the rotor and shorten the take off distance required by the rotorcraft. Take off of the rotorcraft may be accomplished without ever adding fuel to the flow of compressed air to the tip nozzle.

The present invention provides a coating scraper and a coating apparatus for photocuring rapid prototyping, the coating scraper is an integrated structure, and includes a mounting beam and a scraper body connected with the mounting beam, the scraper body is provided with a downwardly-opening long groove, and edges are arranged on two sides along the longitudinal direction of the long groove. The integrated-structure coating scraper is light in weight, easy to adjust and easy to assemble and reduces the cost.

The invention belongs to the technical field of vehicle stopping and particularly relates to a self-adjusting static friction type vehicle stopping mechanism. The self-adjusting static friction type vehicle stopping mechanism comprises a plurality of wheel constraint mechanisms, wherein each wheel constraint mechanism comprises a friction belt, a balance block, spiked nails, a force applying board, resistance wheels and a friction wheel and can constrain the wheel of a running vehicle. After the wheels are constrained by the wheel constraint mechanisms, the car drags the wheel constraint mechanisms to move forwards along with the vehicle, static friction force between the ground each friction belt is generated to drive the friction belt to rotate due to the fact that the friction belt is arranged on the bottom surface of the wheel constraint mechanism, and the resistance wheels on the friction belt generate appropriate resistance to allow the resistance of the resistant wheels to constantly keep the static friction state between the ground the friction belt. In addition, the balance block is added into each wheel constraint mechanism, the positions of the balance body in the wheel constraint mechanism are adjusted according to vehicle speed, the faster the vehicle is, the more rear the balance block is, forward turning, driven by the vehicle, of the wheel constraint mechanism is prevented, fast vehicle braking is achieved, and a good use effect is achieved.

The invention aims to improve a method for selecting an eccentric distance of a rotational valve plate and in particular relates to the method for selecting the eccentric distance which has no interference friction when the rotational valve plate is closed. The method is characterized in that the eccentric distance is selected by geometric construction or determined by calculation of a formula method according to the claim 1. Compared with the prior art, the eccentric distance determining method of the invention greatly increases the eccentric distance and normally at least increases by more than twice. The large eccentric distance makes all sealing points on the valve plate are pressed toward a valve seat in an infinite approximation mode and makes the valve plate interference not exist in the rotational opening/closing process of the valve plate so as to overcome the defect of excessively small eccentric distance of the valve plate in the prior art fundamentally. After the valve plate is closed, the closeness of the valve plate is improved by increasing a torque force. A positioning support rod is arranged between an upper half shaft and a lower half shaft, so that the lower half shaft can be arranged from top to bottom and the installation of the valve plate is simplified.

The invention discloses a dual-channel safety torque turn-off circuit and a dual-channel safety torque turn-off method. The circuit comprises a dual-channel STO input module, a power switch module, anMCU control module and an isolation driving module. The power switch module is connected with the dual-channel STO input module and the isolation driving module, and the MCU control module is connected with the dual-channel STO input module and the isolation driving module. The dual-channel STO input module receives an external STO signal, and outputs a standard STO signal to the power switch module through isolation and filtering; the power switch module triggers the power supply voltage to the isolation driving module according to the STO signal, and the MCU control module controls the PWMsignal to be output to the isolation driving module; and the isolation driving module drives the external motor according to the power supply voltage and the PWM signal. According to the scheme, powersupply control is carried out on the isolation driving module from a circuit level, the safe and reliable operation of an STO function is guaranteed, and through the hardware judgment and software judgment on STO signals, it is effectively guaranteed that accidental torque does not occur.

The invention discloses a power transmission case comprising a case body, an input shaft, an output shaft, a driving gear, a driven gear, a shift clutch, a toggle mechanism and a hydraulic motor. The case body comprises left case body and a right case body, subdivision surfaces of the left case body and the right case body are vertical planes, a bearing seat and an internal spline are arranged in a gear hole of the driving gear, two ball bearings are mounted in the bearing seat, the input shaft is provided with an external spline, the shift clutch is composed of a shift meshing sleeve, a meshing sleeve positioning mechanism and the internal spline of the driving gear, the meshing sleeve positioning mechanism is mounted on the input shaft, the shift meshing sleeve is provided with an internal spline and an external spline, the internal spline of the shift meshing sleeve is meshed with and in axial sliding fit with the external spline of the input shaft, the external spline of the shift meshing sleeve can be meshed with or separated from the internal spline of the driving gear, and the toggle mechanism comprises a toggle cylinder, a fork pull rod and a fork. The power transmission case is simple and reasonable in structure and easy to manufacture, the requirements for high-speed running and low-constant speed operating, running and driving of a rapid multifunctional operating vehicle are met.

The invention relates to a dynamic slideway capable of straight line motion with an electric and pneumatic composite transmission function. The invention comprises two air cylinders, a screw rod nut driving mechanism, an electromotor, a reducer, an electromagnetic controller and a photoelectric sensor to form a straight line motion driving and controlling unit integrating the factors of liquid, mechanics, electron and optics; the invention can easily achieve the straight line motion speed and the position control with a high comprehensive index.

The invention provides a personalized assembly type dental implant and implant tooth. The personalized assembly type dental implant comprises an assembly type base table and two or more tooth roots. The bottom of a dental crown is provided with a base groove used for being connected with the assembly type base table in a sleeving mode. The assembly type base table is an intergral assembly type base table formed by combining two or more independent base table bodies. The independent base table bodies are arranged at the tops of all the tooth roots correspondingly. Each independent base table body is provided with an outer contact face and one or more inner contact face. The inner contact faces of the independent base table bodies are attached to the inner contact faces of the adjacent independent base table bodies. Clamping parts are arranged between the adjacent inner contact faces. According to the personalized assembly type dental implant and implant tooth, by arranging the assembly type base table, an original tooth socket can be utilized for mounting the implant tooth, pain of a patient is relieved, and the tooth repair time is shortened. The personalized assembly type dental implant and implant tooth are reasonable in structure design, and the problem that existing implant teeth cannot use original tooth sockets of two or more tooth roots can be solved.

The invention relates to the technical field of a test machine, and specifically relates to an integrated structure of a linear module and a mounting pedestal. The integrated structure of a linear module and a mounting pedestal includes a U-shaped mounting pedestal (1) and a linear module, wherein the U-shaped mounting pedestal (1) includes a base plate (11) and two side plates (12) which are arranged along two edges of the length direction of the base plate (11); the linear module includes a driving structure (2) and two slide rails (3); the driving structure (2) and the two slide rails (3) are directly arranged on the U-shaped mounting pedestal (1); the two slide rails (3) are arranged at the top surface of the two side plates (12); and linear module also includes a slide piece (4) which makes a reciprocating linear movement on the slide rails (3). The invention provides an integrated structure of a linear module and a mounting pedestal, having the advantages of being simple in structure, being easy for processing, being low in cost, being small in the precise processing area of the base plate, and being able to reduce stress deformation caused by cutting heating to the greatest extent. The invention also provides a PCB impedance automatic test machine.

The invention discloses a novel air-train traffic transportation system. The system includes a vehicle body and a plurality of support columns. The two sides of each support column are provided with trusses of a hollow structure, the bottom of each truss is provided with a rail with the rectangular cross section, the bottom of the rail is provided with an opening, and two hubs are arranged in theopening; a connection shaft is arranged between the two hubs, a differential mechanism is arranged on the connection shaft, the side face of each hub is uniformly provided with a plurality of air inlets, each hub is internally and uniformly provided with a plurality of reinforcing ribs, the reinforcing ribs are provided with a third bearing, the two ends of the connection shaft are connected withthe insides of the third bearings of the two hubs, and a second bearing is arranged on the connection shaft; the connection shaft is sleeved with the second bearing, the second bearing can rotate around the connection shaft, a rotating disk is arranged on the second bearing, the outer wall of the rotating disk is uniformly provided with a plurality of blades, the bottoms of the two hubs are provided with suspension devices, and the two suspension devices are connected with the tail and the head of the vehicle body respectively.

The invention provides a handheld power tool and an operation method thereof. The handheld power tool comprises a shell, a handle, a switch, a motor, an output shaft and a work assembly. The work assembly comprises at least two work chucks, wherein each of the work chucks includes a work shaft. The handheld power tool further comprises a control mechanism used for locking the position, relative to the shell, of the work assembly. The control mechanism comprises a control part which is adjacent to the switch and moves relative to the shell, and the control part can be used for releasing position locking of the work assembly in an operable manner and controlling one of the output shaft and the work shaft to disengage from matched connection. The position conversion of the work chucks can depend on other parts of the body of an operator, the operation can be completed with the single hand, and the operation is convenient and reliable.

The invention relates to an electric hydraulic ring-plug pump, and belongs to the technical field of hydraulic power element structures. A bearing, an oil distribution sleeve, a spring, a ring plug, a guiding ring, a tilting disc, a driving ring, a tilting disc, a guiding ring, a ring plug, a spring, an oil distribution sleeve, a spring, a ring plug, a guiding ring, a tilting disc, a driving ring, a tilting disc, a guiding ring, a ring plug, a spring, an oil distribution sleeve and a bearing sequentially sleeve a hydraulic pump stator of the electric hydraulic pump from left to right, and abut against each other. The electric hydraulic pump disclosed by the invention is simple in structure and adopts few movable parts, so that the reliability of the electric hydraulic pump is improved, and the cost of the electric hydraulic pump is reduced; the electric hydraulic pump is a two-way hydraulic pump; the distance between a high-pressure oil cavity and a low-pressure oil cavity is long, and equal to the heights of the two ring plugs, and the internal leakage between the high-pressure oil cavity and the low-pressure oil cavity is small; the rigidity of the springs of the hydraulic pump is high, so that the self-sucking capability of the hydraulic pump is high; the electric hydraulic pump is provided with few rotating parts, so that the rotating inertia is small.

The invention discloses a hanging type air monorail traffic system with a connecting mechanism. The system includes a pendant head, wherein a hanging device is arranged between the pendant head and acar body, the hanging device comprises a filament shaft, a main shaft, a locating shaft, a bearing plate, a screw plate and a telescopic component, one end of the filament shaft is connected with oneend of the pendant head near the car body, the other end of the filament shaft is connected with one end of the main shaft through a steering component, all the filament shaft and the main shaft can independently rotate around own axis; the other end of the locating shaft is connected with the screw plate after movably running through the bearing plate, one end of the locating shaft is connected with the bearing plate, the other end of the locating shaft is connected with the car body after movably running through the screw plate, one end of the telescopic component is connected with the bearing plate, the other end of the telescopic component is connected with the screw plate. The system protects the quality of the joint part between a wheel hub and the car body, slows down the vibrationof the car body, and improves the stability of empty iron running and the comfort of the passengers taking empty iron.

The embodiment of the invention provides a motor protection device and method. The device comprises a controller, a driver, a three-phase bridge rectifier circuit, a bus capacitor, three switching circuits and three first resistors; the controller is used for sending a control signal to the driver and controlling the on-off state of each branch in the three-phase bridge rectifier circuit and/or the switching circuits; the driver is used for applying voltage to the grid electrode of a first IGBT and/or the grid electrode of a second IGBT through the received control signal, providing driving current and controlling the on-off state of the first IGBT and/or the second IGBT; the three-phase bridge rectifier circuit is used for quickly discharging the bus capacitor and supporting the operation of an active short circuit; and the switching circuits are used for switching to a preset branch according to the received control signal of the controller so as to protect a motor. In the prior art, torque cannot be effectively reduced in time, as a result, a vehicle power system cannot be protected, and the driving experience is affected. Withthe motor protection device adopted, the above defects can beovercome.

The invention discloses a corrosion test loading device and a test method for the short transverse direction of a metal plate. The test method comprises the following steps: making the loading device, pre-loading, loading and performing a test. The loading device is provided with a frame-shaped loading frame; a cubic hole is formed in the upper part of the loading frame; an upper plug pin loading section extends into the loading frame through the cubic hole; a clamping groove A which is matched with a test sample clamping section A is formed in an upper plug pin loading section which extends into the loading frame; a rotary nut, a gasket A, a spring and a gasket B are mounted at the end head of a threaded section out of the loading frame; the shape of one end of a lower plug pin is matched with that of a through hole, and the lower plug extends into the loading frame through the through hole; the diameter of the other end of the plug pin is greater than that of the through hole; a clamping groove B which is matched with a test sample clamping section B is formed in the lower plug pin which extends into the loading frame; the two ends of a plate test sample are clamped on the clamping groove A and the clamping groove B; loading is performed by twisting the rotary nut, and no torque is generated; the loading strength can be adjusted through a spring with a known elastic coefficient.

The invention discloses a vacuum arc-extinguishing chamber for reducing impact of a vacuum circuit breaker. The structure comprises a movable conducting rod, a weakened-impact arc extinguish chamber and a static conducting rod. The lower end of the movable conducting rod is arranged at the top end inside the weakened-impact arc extinguish chamber in an embedded manner. The upper end of the staticconducting rod is arranged at the bottom end inside the weakened-impact arc extinguish chamber in an embedded manner. A protection sealing ring sleeve on the inner wall impact protection mechanism isimpacted by the excessive impact force. One part of the impact force is consumed through the protection sealing ring sleeve. An inner wall flattening rod is driven by the impact force to be attached to the inner wall of the arc extinguish chamber to rotate. Therefore, the inner wall of the arc extinguish chamber is flattened, and the shell deformation of the arc extinguish chamber is avoided. Theservice life of the arc extinguish chamber is prolonged. Meanwhile, one part of impact force is conducted to the top end. At the moment, the part of the impact force is diffused through an impact diffusion plate at the bottom end of a corrugated pipe. The corrugated pipe is attached through a corrugated pipe impact protection mechanism. Therefore, the protection effect is achieved. It is guaranteed that the corrugated pipe cannot generate torsion. The air leakage failure of the arc extinguishing chamber is avoided.