65results about How to "Act as overload protection" patented technology

The invention relates to an actual-vehicle-simulated vibration test-bed for transmission shafts with different specifications and belongs to the actual-vehicle-simulated vibration test-bed for the transmission shafts with different specifications. A first rack and a second rack are fixed on the foundation of a test room side by side, the second rack is located at the right side of the first rack, a power output system is arranged on the first rack, a vibration excitation device is arranged on the first rack at the right side of a power output device, a safety braking system is arranged above the vibration excitation device, the left end of the safety braking system is connected with the power output system, the right end is fixedly connected with a first right end fixing cover of the first rack, a supporting system is arranged on the second rack, and a loading device is mounted at the tail end of the supporting system. The test-bed has the advantages that the measurement on the vibration of a transmission shaft assembly is realized, and the defect that most of traditional vehicle transmission shaft vibration test-beds cannot sufficiently perform corresponding simulation tests according to different vehicle model parameters and road conditions and cannot quickly adjust angles of the transmission shafts is overcome.

The invention discloses a moving type automatic-adjustment steel jacking and pushing device, and belongs to the field of steel conveying devices. The moving type automatic-adjustment steel jacking and pushing device comprises a support base, a jacking platform and a screw rod, wherein one end of the screw rod is fixedly connected with the jacking platform; the other end of the screw rod is sleeved by a screw nut and is in threaded connection with a support base; a motor is arranged on the support base; the output shaft of the motor is in transmission connection with a screw nut belt; two guide holes are formed in the support base; bushings are arranged inside the guide holes; the jacking platform is connected with two guide rods which respectively extend into the bushings; rollers with brake plates are connected to the bottom of the support base. With guidance of the guide rods, the jacking and the conveying are relatively stable and reliable, materials can be fed into different pieces of equipment, different welding heights are met, the welding quality is ensured, the applicability is high, and due to belt transmission, not only is relatively accurate height achieved, but also an overload protection function is achieved.

The embodiment of the invention discloses a method for reducing drive eccentric errors of a harmonic gear and an automatic aligning wave generator. The automatic aligning wave generator comprises a turn plate driven by an input shaft and an elastic floating mechanism provided with two rollers. The elastic floating mechanism is flexibly arranged inside the turn plate in a sliding manner in the long axis direction of the automatic aligning wave generator. The elastic floating mechanism comprises two roller brackets symmetrically distributed relatively to the centre of the turn plate and an elastic element arranged between the roller brackets; the elastic element elastically resists against the two roller brackets, and the two rollers are respectively arranged on the two roller brackets, elastically resist against an inner circle of a flexible gear under the action of the elastic element and force the flexible gear to form an ellipse from a round shape, so that gear teeth of the flexible gear are tightly meshed with gear teeth of a rigid gear. The automatic aligning wave generator can reduce the eccentric errors caused by processing and assembling of parts, can remove the gear backlash between the gear teeth of the flexible gear and the gear teeth of the rigid gear and play an overload protection role.

The invention provides a coal mining machine and a travel unit overload protective device thereof. The travel unit overload protective device of the coal mining machine comprises a first connecting piece, a second connecting piece and a friction piece, wherein the first connecting piece is connected with a low-speed end of a transmission system of a traction unit of the coal mining machine; the second connecting piece is connected with a travelling wheel of the travel unit of the of the coal mining machine; and friction surfaces of the friction piece are respectively tightly pressed on the first connecting piece and the second connecting piece, so that the first connecting piece and the second connecting piece can be in overload slipped connection with each other. The travel unit overload protective device of the coal mining machine has the beneficial effects that when the overload phenomenon occurs, the first connecting piece and the second connecting piece can slip to realize overload protection, so that overload protection parts can not be damaged; and as the first connecting piece is connected with the low-speed end of the transmission system of the traction unit of the coal mining machine, the overload protection effect can be played within the shortest time, so that damage to transmission parts and components due to overload can be avoided.

The invention discloses a highly-applicable rolled steel conveying device matched with the conveying height, and belongs to the field of rolled steel conveying devices. The highly-applicable rolled steel conveying device comprises a supporting seat, a jacking table, and a screw, wherein one end of the screw is detachably connected with the jacking table, and the other end is sleeved with a nut and in threaded connection with the supporting seat; a motor is arranged on the supporting seat; an output shaft of the motor is in belt driving connection with the nut; two guide holes are formed in the supporting seat; bushes are arranged in the guide holes; the jacking table is detachably connected with two guide rods which respectively extend into the bushes; a positioning rod is arranged on the supporting seat; a hard stop block is detachably arranged on the positioning rod; a damper is arranged at the lower end of the hard stop block. With guiding of the guide rod, the jacking and conveying operation can be more stable and reliable; the height of the hard stop block can be correspondingly arranged according to different conveying heights, and the jacking table is raised to the required height, and then is propped against the hard stop block for positioning, so that the applicability is greatly improved, and the jacking table can be correspondingly dismounted and replaced according to different types of the rolled steel.

The invention relates to a plate-fin heat exchanger with a pressure-temperature control valve. The heat exchanger comprises a core body, a first end enclosure, a second end enclosure and a by-pass pipe, wherein the first end enclosure, the core body and the second end enclosure are connected sequentially; the first end enclosure is provided with an oil inlet; the second end enclosure is provided with an oil outlet; and the first end enclosure and the by-pass pipe are communicated through the pressure-temperature control valve. The plate-fin heat exchanger provided by the invention simultaneously has the capabilities of low-temperature overloading protection and instant high-pressure overloading protection, and is good in reliability and long in service life.

The invention belongs to the technical field of a massage chair and particularly relates to a machine core overload protection device used on a massager. The device comprises a traveling driven gear wheel and a traveling meshing pinion; the traveling driven gear wheel is sleeved on an extension shaft of the traveling meshing pinion and then a belleville spring is also sleeved on the extension shaft; the traveling driven gear wheel is squeezed by the belleville spring, so that radial grooves arranged on the lower end face of the traveling driven gear wheel are matched with radial convex semicylinders arranged on the upper end face of the traveling meshing pinion; and finally, the belleville spring and the traveling driven gear wheel are subjected to axial limiting by an axial elastic check ring. Under the overload condition, the traveling meshing pinion and the traveling driven gear wheel on an overload clutch device are in coaxial departure connection, so that a machine core traveling transmission device of the massager drives the traveling driven gear wheel on the overload clutch device to idle, and thus, the protection effect on a rack and a machine core of the massager is achieved and the overload protection effect and the protection mechanism are improved.

The invention discloses a peripheral transmission concentration mud scraper which comprises a pond body, a center rotating support, a main beam, a transmission device and a scraper plate, wherein the pond body is of a half-straddle type structure, a center upright and a water inlet pipe are arranged in the middle of the pond body, the water inlet pipe and the center upright are arranged in parallel, the center rotating support is arranged at the upper end of the center upright, one end of the main bam is connected with the center rotating support, the transmission device is arranged at the other end of the main beam, the transmission device is connected with a hinged scraping arm, the bottom of the hinged scraping arm is connected with the scraping plate, and vertical gird bars are arranged on the scraping plate. The peripheral transmission concentration mud scraper is simple in structure; water enters from the center and is discharged from the periphery, and mud is discharged from the bottom of the center, the vertical grids mainly play roles in slow carding and coagulating, so that the sludge compactness is improved. By adopting the hinged scraping arm, the effect of overload protection is played, the operation cost is effectively lowered; a truss girder is light in mass and good in rigidity; the scraper plate is arranged spirally, so that the mud scraping effect is relatively good.

The invention relates to an automobile air-conditioner fixed torque driver which comprises a belt wheel (1) and a spline disc (6). A set of leaf springs (5) are arranged. One end of each leaf spring is connected to one end face of the belt wheel through a bolt (2), and the other end of each leaf spring is connected to the spline disc through a rivet (7). The opposite edges of each leaf spring are provided with opposite split pin holes respectively. Outer side positioning pins (3) and inner side positioning pins (4) correspondingly matched with the split pin holes are arranged on the spline disc. The automobile air-conditioner fixed torque driver has the advantages that the portion between the two split positioning pin holes in the leaf springs is the stress concentration position; when a compressor is overloaded continuously, the stress concentration position is most likely to be snapped, the compressor overload protection effect is achieved, and the rated torque of the automobile air-conditioner fixed torque driver can be determined by determining a tension value during snapping. When the compressor is overloaded instantaneously, the inner and outer side positioning pins are extruded and retracted, large instant elasticity is fed back to the leaf spring, and it has been ensured that the leaf springs can continue to be in use normally after being overloaded instantaneously.

The invention relates to an elastic body of a weighing sensor. The elastic body comprises a fixed part and a strain part. The fixed part comprises a printing plate mounting hole formed in the elastic body. The strain part comprises a strain hole formed in the elastic body and a set of strain pieces fixed in the strain hole. A cross-shaped overload beam is arranged in the strain hole. An upper overload gap on an upper groove opening of a vertical beam of the overload beam is used for balancing an output signal during overloading of a first strain piece and a second strain piece on two sides of the upper groove opening. A lower overload gap on a lower groove opening of the vertical beam of the overload beam is used for balancing an output signal during overloading of a third strain piece and a fourth strain piece on two sides of the lower groove opening. The upper overload gap delta 1 of the upper groove opening is identical to the lower overload gap delta 2 of the lower groove opening. A middle groove opening is formed in a horizontal beam of the overload beam. A middle overload gap lambada of the middle groove opening is used for overload protection. The elastic body of the weighing sensor is compact in structure, an overload part is arranged in the elastic body, good side-loading-resistant capacity and good overload protection performance are achieved, controlling and machining are convenient, and service life can be prolonged.

The invention discloses an anti-overload torque sensor based on film sputtering. The anti-overload torque sensor comprises an output cable, a circuit board, a cushion column, a shell, an elastic body, a strain beam and film strain gauges, wherein the elastic body is an annular plate, the annular plate is sequentially divided into an inner edge section, an installation ring section and an outer edge section from inside to outside, the installation ring section is provided with an integrally formed rectangular bulge serving as the strain beam, the shell is coaxially mounted on the installation ring section of the elastic body, the circuit board is located in the annular cavity of the shell and installed on the installation annular section of the elastic body through the cushion column, one end of the output cable is welded on the circuit board, the other end of the output cable is connected with an external electric connector, and the strain resistors of the two film strain gauges are sputtered on the strain beam of the elastic body through a sputter coating technology. According to the invention, a sensitive film is prepared by adopting a sputter coating process, and an anti-torque limiting structure is arranged, so that when a torque load exceeds a set threshold value, the anti-torque limiting structure can play a role in overload protection of the elastic beam.

The invention relates to an overload protecting device for a speed regulation type magnetic coupling. The overload protecting device comprises a speed regulation type magnetic coupling, a working machine, an electric motor, a rotation speed sensor, an infrared temperature sensor, a PLC control box and a frequency converter. If the rotation speed of a copper rotor sent by the rotation speed sensor to the PLC control box exceeds a preset protection rotation speed, the PLC control box sends a frequency reducing instruction to the frequency converter, otherwise, the PLC control box sends a frequency invariant instruction; if the temperature of a permanent magnet rotor sent by the temperature sensor to the PLC control box exceeds a preset protection temperature, the PLC control box sends a frequency reducing instruction to the frequency converter, otherwise, the PLC control box sends a frequency invariant instruction; if the electric motor receives a halt instruction, the rotation speed of an input shaft is zero, and then the rotation speed of an output shaft is zero, namely the power is not transferred by the speed regulation type magnetic coupling; otherwise, the electric motor receives a continuous operation instruction, and the speed regulation type magnetic coupling continues to provide powder.

The invention discloses a safety protection system and a safety protection method for preventing a container truck from being hoisted. The safety protection system comprises torsion locks on a container truck carriage, a truck scale used for weighing the container truck, and a lifting appliance used for lifting containers, force sensors are arranged on the torsion locks, the lifting appliance is provided with a plurality of rotating pin force sensors, and the system further comprises a controller used for receiving data of the force sensors, the rotating pin force sensors and the truck scale and used for comparing the data. According to the safety protection system and safety protection method, the problem of potential safety hazards caused by manual operation errors is solved.

The invention discloses a brake axle load integrated-type axle load measuring device, which comprises a roller-type brake force testing platform, a pressure plate, a pull rod, a force measuring sensor, a working air cylinder, first connecting pieces, a second connecting piece and four working levers which stay on the same horizontal plane, wherein the pressure plate is fixedly connected with a push rod of the working air cylinder sequentially through the pull rod and the force measuring sensor, a first end of each working lever is connected with the pressure plate respectively through own first connecting piece, and a second end of each working lever is connected with a stander of the testing platform respectively through the second connecting piece; two of the four working levers are overlapped with a first straight line, the other two working levers are overlapped with a second straight line, the orthographic projection of a joined point of the first straight line and the second straight line on a working panel of the testing platform is overlapped with a geometric center of the working panel, and two working levers staying on the same straight line are symmetrically distributed by adopting the joined point as the center; and each first connecting piece comprises a first lower spherical seat and a first steel ball, and each second connecting piece comprises a second upper spherical seat, a second steel ball and a second lower spherical seat.

The objective of the invention is to provide a double-proportioning-valve-controlled liquid fertilizer application system capable of timely amount changing. The system comprises a hydraulic fuel tank, a liquid injection pipe, a liquid injection pump, a hydraulic motor and an electric-hydraulic proportional direction valve. The hydraulic pump is connected to the hydraulic fuel tank. A filter is disposed between the hydraulic pump and the hydraulic fuel tank. The electric-hydraulic proportional direction valve comprises a fuel inlet, a fuel return port, a first fuel outlet and a second fuel outlet. The hydraulic pump is connected to the fuel inlet of the electric-hydraulic proportional direction valve through a pipe. A quick coupling is mounted on the pipe. The fuel return port of the electric-hydraulic proportional direction valve is communicated with the hydraulic fuel tank. The first fuel outlet and the second fuel outlet of the electric-hydraulic proportional direction valve are respectively communicated with the inlet and the outlet of the hydraulic motor. The output shaft of the hydraulic motor is connected to a fuel injection pump through a coupling. The fuel injection pump is separately communicated with a liquid fertilizer tank and the liquid injection pipe. The system achieves timely-amount-changing fertilization of liquid fertilizers according to different actual agricultural production requirements, achieves an objective of accurate control, increases the using efficiency of the liquid fertilizers, promotes rapid production of desired fertilizer effects, and reduces loss.

The invention discloses a manned system of a ship crane. An independent manned winch is mounted on the rear portion of a cargo winch on a crane jib. The manned winch is composed of a wall frame, a winding drum, a manned lifting cage, a hydraulic motor, a speed reducer, a winding drum brake and a valve set. The winding drum is fixed to the jib through the wall frame. The speed reducer is arranged in the winding drum. The speed reducer is provided with a wet hydraulic normal close brake and is connected with the hydraulic motor. The valve set is mounted on the hydraulic motor. A manned steel wire rope is wound on the winding drum and is connected with the manned lifting cage through a lifting hook. The winding drum brake is mounted on the winding drum and is provided with a lifting hook ascending and descending limiting device. The requirements for safety and reliability of the manned winch of the manned system are higher than those of the cargo winch, the winding drum brake is additionally arranged on the basis of integrating the brake on the speed reducer, dual brake is formed, the two brakes are controlled by the same oil way and act at the same time, and the design redundancy rate of the safety and reliability of the manned winch is fully guaranteed.