91results about How to "Play the role of overload protection" patented technology

The invention discloses a magnetorheological damper having parallel normally-open holes and methods for calculating zero-field damping coefficient, on-field damping coefficient and damping force of the magnetorheological damper. The magnetorheological damper comprises a cylinder, a piston is slidably disposed inside the cylinder, a piston rod is disposed at one end of the piston, the piston rod extends out of one end opening of the cylinder, the piston comprises a core, the sidewall of the core is provided with at least one circular groove in a recessed manner, an excitation coil is wound in each circular groove, a magnetic-shielding protective ring covers the outside of each excitation coil, and magnetic permeability protective rings cover the sidewall of the core, a gap between the magnetic-shielding protective rings and magnetic permeability protective rings and the inner wall of the cylinder forms a circular damping passage in the axial direction, and the core is provided with at least one normally open hole. Under semi-active control of structural vibration, damping force can be controlled for the magnetorheological damper just by switching zero current and maximum current according to a switch control strategy, establishment and solution of a complex reverse mechanical model are avoided, and the control process is simple and practical.

The invention relates to the field of mining machinery, and discloses a coal cutter and a rocker arm transmission system thereof. The rocker arm transmission system is arranged between a cutting roller and a cutting motor. The rocker arm transmission system comprises a first spur gear speed-reducing transmission part connected to the cutting motor, a second spur gear speed-reducing transmission part connected to the cutting roller, and a planet gear speed-reducing transmission part arranged between the first spur gear speed-reducing transmission part and the second spur gear speed-reducing transmission part. The rocker arm transmission system of the coal cutter has the advantage that the planet gear speed-reducing transmission part is arranged between the first spur gear speed-reducing transmission part and the second spur gear speed-reducing transmission part, and thus the rocker arm transmission system has a large transmission ratio; a rotating speed and a line speed of the cutting roller are reduced; a working face environment of the coal cutter is improved; a size of a structure cooperating with a cutting roller hub is reduced; the length of a cutting roller blade is increased; and coaling effects and coaling efficiency of a thin coal layer are improved.

The invention discloses an overload protecting device for a transmission element of a cutting part of a coal mining machine. The device comprises a cutting motor (1), a frictional torque limiter (5) for performing overload protecting, and a cutting speed reducer (9), wherein an input shaft (4) of the frictional torque limiter (5) is connected to a motor shaft (2) of the cutting motor (1) through a coupling I (3), and an output shaft (6) of the frictional torque limiter (5) is connected to a high-speed shaft (8) in the cutting speed reducer (9) through a coupling II (7). According to the overload protecting device, the frictional torque limiter is of a wet type multi-frictional-sheet structure; if the cutting part of the coal mining machine is subjected to overload, the frictional sheets in the frictional torque limiter can slip to achieve overload protection; in addition, after the overload, the frictional torque limiter can be automatically recovered into the normal working state. The overload protecting device has the advantages of being simple in structure, reliable to work, large in transmission torque, easy to maintain, easy to manufacture, and low in cost, and preventing the transmission element of the cutting part from torsional damage during the overload.

This invention provides an ethernet exchanger and its method to realize the redundance supply. The exchanger comprises exchanger interface and network communication management module, wherein the network management module comprises network transformer, signal receiving and sending controller and exchange engineer and address. The exchanger comprises voltage modulation circuit of bus supply, wherein the network transformer is connected with voltage modulation circuit. The direct power output is connected with voltage modulation circuit or exchanger interface lead leg.

The invention relates to a potato harvesting and residual film recycling combine machine. A two-stage conveying structure is adopted, potatoes move on a lower layer of a primary conveying shaking mechanism, and straw and a mulching film move on an upper layer of the primary conveying shaking mechanism; through the conveying of the primary conveying shaking mechanism, the potatoes fall down after the primary conveying is over, and the straw and the mulching film move upwards along a secondary conveying mechanism. Since a bow-shaped supporting rod of the secondary residual film conveying mechanism diffuses a mixture of residual soil and the potatoes towards the two sides, the mixture is gathered into lines in fields under the effect of a potato collecting sieve, the mulching film is collected by a wound film collecting device, and the straw is thrown out and returns to the fields or is wound around a residual film collecting barrel. As the place where the straw falls to is located at therear of the place where the potatoes fall to, the interference with picking up the potatoes caused by the burying of the straw underground is avoided. The potato harvesting and residual film recycling combine machine is light in weight, simple and ingenious in hierarchical structure, convenient and flexible, workers' labor intensity is alleviated, and the working efficiency is improved.

The invention discloses an overload protection device for a pulse power amplifier, which comprises a first connecting plate, the side wall of the first connecting plate is connected with a baffle through a stud, the side wall of the baffle is connected with a push plate through a stud, and the push An air bag is placed between the plate and the first connecting plate, the side wall of the push plate is provided with a ventilation hole, the side wall of the push plate close to the ventilation hole is fixed with a linkage rod by a screw, and the end of the linkage rod is welded with a shock absorber, The first contact plate is welded with a splint near the side wall of the shock absorber, and the side wall of the splint is threadedly connected with a second spring. In the present invention, the first contact plate, the slide rail, and the linkage rod And the setting of the shock absorbing device can make the pressure generated by the gas in the air bag heated and expanded, so that the push plate pushes the linkage rod and the shock absorbing device to push the second contact plate away from the first contact plate, so that the circuit can be activated in time and quickly. power off.

The invention relates to an electric power steering system and method based on a double-motor planet gear structure. The electric power steering system comprises a steering wheel, a torque coupling gear, a second power motor gear, a speed reducer, a first power motor, a second power motor, a synchronizer, a planet gear mechanism and a first power motor gear, wherein a first steering shaft and a second steering shaft are sequentially arranged between the steering wheel and the speed reducer; the first power motor gear is arranged on an output shaft of the first power motor, and is connected with the planet gear mechanism through a connecting shaft; the torque coupling gear is arranged on an output shaft of the second power motor, and the second power motor gear is coaxially arranged on one side of the torque coupling gear; the first power motor gear is meshed with the torque coupling gear; and the synchronizer is arranged between the torque coupling gear and the second power motor gear. According to the electric power steering system disclosed by the invention, through the cooperation of a plurality of electromagnetic clutches, influence caused by mutual drive of motors is avoided, so that the situation that the power capability is wasted is avoided.

The invention discloses a remote-control rotary locker. The remote-control rotary locker comprises a base, rotary locker bodies and a transmission system. By virtue of an electromechanical integrated design, the output power of a motor and power shutoff and shutdown of each rotary locker body are controlled by a remote-control signal receiving processor; power is transmitted to each rotary locker body for rotating each rotary locker body through a friction lever. The remote-control rotary locker is beautiful in style, simple and convenient to operate, convenient to use, reasonable in design and greatly convenient for classified storage, management, comparison and taking of objects due to a layered rotary design. By virtue of the reasonable separate bin design of the rotary locker and a remote control device, a user can enjoy a convenient, easy and quick article storing and taking service. Meanwhile, the rotary locker bodies are arranged in a stacked mode, so that the placing space is greatly saved; the remote-control rotary locker is attractive, and suitable for being used in home, office space and public places.

The invention discloses an automatic turning light switching-on system of a vehicle, belonging to the field of early warning for safe driving of automobiles. The automatic turning light switching-on system comprises a signal acquisition module, a single chip microcomputer and an execution module. The input end of the single chip microcomputer is connected with the signal acquisition module, and the output end of the single chip microcomputer is connected with the execution module. The signal acquisition module is used for acquiring vehicle speed signal, steering wheel angle signal, steering wheel speed signal, turning light switch signal and lane line image information of the vehicle. Single-chip microcomputer is used to synthetically process the signals acquired by the signal acquisitionmodule and output the control signal to the execution module. The executing module controls whether the turn signal needs to be turned on according to the signal output from the single chip microcomputer. The invention has the characteristics of simple operation, low cost and the like. The invention utilizes the hardware resources provided on the existing automobile to judge the driving intentionof the driver through the creative design. If the driver is judged to change lanes without turning on the turn signal lamp, the corresponding turn signal lamp is automatically turned on to achieve thepurpose of prompting the rear vehicle to avoid concession.

The invention discloses a water seal friction torque detection machine. The water seal friction torque detection machine comprises a support frame, a torque sensor, a servo motor, a pressure sensor, alifting device and a console; a support platform is mounted on the support frame; the torque sensor and a water seal mounting seat are mounted above the middle part of the support platform in sequence; vertical shaft levers are symmetrically mounted on two sides of the support platform; a fixed cross beam is mounted at the top ends of the vertical shaft levers; a movable cross beam is mounted atthe middle parts of the vertical shaft levers; the vertical servo motor is fixedly mounted at the middle part of the movable cross beam; a motor output shaft of the servo motor is aligned with the middle part of the water seal mounting seat; the movable cross beam is connected with the pressure sensor and the lifting device in sequence through a force transmission seat; the lifting device is fixedon the fixed cross beam; and the console is in data connection with the torque sensor, the servo motor, the pressure sensor and the lifting device. The water seal friction torque detection machine can be used for detecting friction torque of water seals under parameters such as different pressures and different rotation speeds, so as to provide data for design and verification of the water seals.

The invention discloses a relay which comprises an insulation shell, an insulation bottom plate, a fuse, and a mounting seat. A containing cavity with one open end is limited in the insulation shell. The insulation shell is provided with two separated wiring columns. The insulation bottom plate is movably arranged in the containing cavity between a first position and a second position. One side of the insulation bottom plate facing the wiring columns is provided with two separated connection contacts. When the insulation bottom plate is at the first position, each of the connection contact presses against a wiring column. When the insulation bottom plate is at the second position, the connection contacts are separated from the wiring columns. The fuse is arranged between the two connection contacts, and two ends of the fuse are electrically connected to the two connection contacts. The mounting seat is provided with a movable push rod to push the insulation bottom plate to move between the first position and the second position. According to the relay of the embodiment of the invention, the overload protection of an external circuit can be achieved, the burning and damage of the electrical components of the external circuit are avoided, and the reliability and the security of the system are improved.

The invention discloses a double-motor electric power-assisted steering system and a power-assisted steering method thereof. A main assisting motor and an auxiliary assisting motor in the steering system are connected through a one-way clutch assembly; an output shaft of the one-way clutch assembly is connected with a steering shaft connected to the lower portion of a steering wheel in parallel through a torsion coupler, and the output end of the torsion coupler is connected with a steering gear; the output shaft of the one-way clutch assembly is connected with the torsion coupler through a speed reducer, an overload protector and a normally closed electromagnetic clutch; the output end of a steering wheel torque and angle sensor, the control end of the main assisting motor, the control end of the auxiliary assisting motor and the control end of the normally closed electromagnetic clutch are connected with a control unit. The double-motor electric power-assisted steering system is provided with the two assisting motors which are connected through the one-way clutch assembly, controls a single assisting motor or the two assisting motors to simultaneously output torque through the control unit according to vehicle speed signals and steering wheel angle and toque signals, meets the requirement of commercial vehicles and the other vehicles for large assisting toque, improves fuel economy for the commercial vehicles, and reduces the operation cost.

The invention discloses a stair climbing device. The device comprises a chassis, a running wheel, a stair climbing wheel, a push-pull mechanism with two ends respectively hinged at the chassis and theslewing frame and a driving mechanism, a first end of the chassis is hingedly provided with a slewing frame, a hinge shaft is horizontal and perpendicular to the moving direction of a stair climbingdevice body, the movable end of the driving mechanism is connected to the running wheel, the driving mechanism is in one-to-one correspondence with the running wheel, and the running wheel and the stair climbing wheel are driven by a drive mechanism; the running wheel is installed on the slewing frame, the stair climbing wheel is mounted on the chassis, or the running wheel and the stair climbingwheel are all mounted on the slewing frame, or the running wheel is mounted on the chassis, and the stair climbing wheel is mounted on the slewing frame; under the push-pull action of the push-pull mechanism, the slewing frame swings, and the alternate landing of the running wheel and the stair climbing wheel can be achieved; a rotating wheel is further included, and a rotating shaft of the rotating wheel is parallel to the hinge shaft of the slewing frame. The device has the advantages that the structure and the principle are simpler, and the movement is flexible and reliable.

The invention discloses a double-motor electric power steering system and a steering method based on an electromagnetic clutch. A first steering shaft is connected under a steering wheel in the system, and the first steering shaft is connected with a second steering shaft through a universal joint. A steering wheel torque and angle sensor is arranged below the steering wheel for detecting torque and steering wheel angle signals acting on the steering wheel. The main motor and the auxiliary motor are coaxial and connected through a first electromagnetic clutch. The output end of the main motoris connected in parallel with the second steering shaft through a torque coupler. The output of the torque coupler is connected to the steering gear via a third steering shaft. According to the magnitude of the required assisting torque, the main motor and the auxiliary motor are controlled to always each bear half of the assisting current and output the torque together, so as to meet the requirements of the commercial vehicle for larger torque, improve the fuel economy of the commercial vehicle and reduce the transportation cost, by setting two coaxial assisting motors which are connected through the electromagnetic clutch.

The invention discloses a double-more electric power-assisted steering system and a power-assisted steering method thereof. A first steering shaft is connected under a steering wheel in the system and is connected with a second steering shaft through a universal joint. A steering wheel torque turning angle sensor is arranged under the steering wheel and used for acquiring torque and turning angle signals of the steering wheel in real time. A first power-assisted motor and a second power-assisted motor are connected through a first torque coupler in parallel, and a first electromagnetic clutch is connected between the second power-assisted motor and the first electromagnetic clutch. The output end of the first torque coupler is connected with the second steering shaft through a second torque coupler in parallel. The output end of the second torque coupler is connected with a steering gear through a third steering shaft. The double-more electric power-assisted steering system is provided with two power-assisted motors connected through the torque couplers so as to control the single power-assisted motor or the two power-assisted motors to simultaneously output torque according to required power-assisted torque and meets the large-torque demands of commercial passenger cars and the like, the fuel economy of commercial vehicles is improved, and operation cost is reduced.

The invention discloses integrated mechanical equipment for producing a green and environment-friendly fertilizer. The equipment comprises a bottom plate, and an adjusting mechanism is arranged on thebottom plate. A mixing tank is arranged on the adjusting mechanism, a discharging port is formed in the lower end of one side of the mixing tank, a cover plate is hinged to the lower end of one sideof the mixing tank, the cover plate corresponds to the discharging port, a stirring mechanism is arranged in the mixing tank, and a feeding hopper is arranged at the upper end of the mixing tank in apenetrating mode. Four supporting rods are rotatably connected to the two sides of the bottom plate. According to the invention, workers can conveniently add corresponding ingredients and materials into two bearing boxes respectively, the accuracy of the ratio of the ingredients to the materials can be well ensured, stirring can be continuously and circularly carried out, so that continuous production is realized, the problem of non-uniform mixing caused by mixing during conveying in the past is avoided, materials and ingredients can be sufficiently and uniformly mixed, the quality of the green and environment-friendly fertilizer is guaranteed, the mixed fertilizer is convenient to collect, and the working efficiency is improved.

The invention discloses an electric linear actuator with a sealed lubrication and overload protection structure. The electric linear actuator comprises a motor, a sliding sleeve, a screw mechanism, a ripple expansion pipe, a pull-pressure sensor and a controller, which are in electrical connection. A support device of the electric linear actuator is arranged in the front end of the sliding sleeve; the support device is simple in structure, small in size and light in weight; the manufacturing cost of an electric cylinder can be greatly reduced; a screw is sealed through the ripple expansion pipe; and the problem that the screw is corroded and damaged due to the contact of moisture and the screw can be solved. The pull-pressure sensor is arranged at the end part of the sliding sleeve; and when an object driven by the electric cylinder in the working process is blocked to increase a load of the electric cylinder and the pull-pressure sensor detects that the load of the electric cylinder is increased to an ultimate load, the controller controls the motor to stop working, so that the electric linear actuator can play an overload protection role in the electric cylinder; overload damage is avoided; and the lifetime of the electric cylinder is prolonged.

The invention discloses a rigid coupling with long service life and belongs to the field of mechanical transmission. A fixed shaft barrel pair correspondingly arranged on the outward sides of half couplings are fixed by corresponding connecting pieces, buffer devices are arranged between the two half couplings, and when one half coupling is driven by the fixed connecting piece to rotate, a shaft rod connected with one coupling can be driven to rotate around the center of the half coupling, and then a piston rod is pushed to move relative to a hydraulic barrel, so that a piston moves in the hydraulic barrel; and due to the fact that the movement of the piston is hindered by reverse elastic force of springs and viscous force of hydraulic oil in the hydraulic barrel at the same time, instantaneous large loads are buffered and absorbed, so that loads borne by the other half coupling and the connecting piece connected with the half coupling are lowered, and the overload protection effect isachieved. Compared with a traditional manner of connection with a single key, by adopting the rigid coupling with long service life, an instantaneous torque can be elastically buffered and absorbed;and all components in the device do not rigidly collide with each other, so that the service life of the whole device is prolonged.

The invention provides a power assembly of a full-hydraulic reverse circulation drilling machine. The power assembly comprises a residue discharge chamber, a reduction gearbox assembly, a mud pump assembly, a rotary connector subassembly, a shaft spacer, a spindle connecting rod, a main fastener, an assembly connecting plate subassembly, a spindle driving clamp slip and a stop pin subassembly. The power assembly has the advantages that two hydraulic motors are serially connected with each other or are connected with each other in parallel, so that two different rotational speeds can be implemented by a reduction gearbox, and the power assembly is adaptive to operation under different geological and aperture conditions; torque of drilling pipes can be changed along with change of the geological conditions of operation, and accordingly energy can be saved; a hydraulic system can be regulated, so that overload protection effects can be realized for drilling machine operation; the vacuumizing time can be shortened owing to sealing structures of the reduction gearbox and mud pumps; the hydraulic motors can be controlled by the hydraulic system and can drive the reduction gearbox with gears to directly drive drilling tools to rotate; flow of hydraulic pumps can be regulated, so that the rotational speeds and the lifting speeds of the drilling pipes and flow parameters of the mud pumps can be regulated; the power assembly is provided with rotary connector mechanisms, so that hole drilling operation can be implemented by impact drill bits or drill bits with rotor wings, and hole drilling operation on the scales larger than 200 meters can be implemented.

The invention discloses a dynamoelectric linear actuator with a sealing and lubricating, shock-absorbing and overload protection structure. The dynamoelectric linear actuator comprises a motor, a sliding sleeve, a screw rod and a threaded sleeve matched with the screw rod; a rubber buffer cushion is arranged between the sliding sleeve and the end plane of the threaded sleeve; and an electric cylinder also comprises a corrugated extension tube, a pull pressure sensor and a controller. According to the dynamoelectric linear actuator, the screw rod is sealed through the corrugated extension tube, so that the problem that the screw rod is rusted and damaged due to the contact between steam and the screw rod can be avoided; by setting the rubber buffer cushion between the sliding sleeve and the threaded sleeve, the axial impact force on a thread pair of a screw rod mechanism can be buffered so as to avoid the damage of the thread pair caused by the axial impact force; and by setting the pull pressure sensor in the end part of the sliding sleeve, when the pull pressure sensor detects that the load of the electric cylinder is increased to the ultimate load, the controller controls the motor to stop working so as to perform the overload protection on the electric cylinder to avoid the overload damage of the electric cylinder and to prolong the service life of the electric cylinder.

The invention discloses a constant pressure hydraulic control valve. The top of the valve body is provided with a threaded hole. An adjusting screw rod is movably connected with the threaded hole through the thread. The bottom of the adjusting screw rod is fixed to the valve core through a constant pressure device. The bottom of the valve core is Fit the sealing frame, the sealing frame is fixed to the inner wall of the valve body, the constant pressure device includes the water inlet tank, the water outlet tank and the sealing assembly, the adjusting screw is fixed on the top of the water inlet tank, the water inlet tank is fixed on the top of the valve core, the water inlet tank There are a number of water inlet holes evenly distributed on the outside, a through hole is provided in the middle of the valve core, the water inlet tank is connected with the water outlet tank through the through hole, the top of the water outlet tank is fixed with the valve core, and a number of water outlet holes are evenly distributed outside the water outlet tank, the sealing assembly Fixed inside the water outlet tank, the sealing assembly includes a compression spring, a fixed block and a sealing ball. This constant pressure hydraulic control valve can protect the valve body and the water pipe from overload through the constant pressure device, preventing the valve body and the water pipe from being damaged by water. Damaged by excessive pressure.

The invention discloses a dynamic coupling pure-electric drive axle and a control method thereof. The drive axle mainly comprises a central motor, two hub motors, two planet mechanisms, five brakes and four dead axle gear pairs. A sun gear and a gear ring of three elements of each planet mechanism serve as two input ends or one element serves as an input end, and a planet carrier of each planet mechanism serves as an output end. The central motor is connected with the sun gears of the planet mechanisms on the corresponding sides through two corresponding dead axle gear pairs, the two hub motors are connected with the gear rings of the planet mechanisms on the corresponding sides, the planet carriers on the two sides are connected with rims on the corresponding sides through transmission shafts to serve as output ends, power is finally transmitted to the rims through the planet carriers, and a vehicle is driven to run. By the adoption of the structural scheme, different working modes can be achieved according to the actual road condition requirements, the high requirement of the vehicle for the dynamic property can be met, a power source works in an efficient area, and the economical efficiency of the vehicle is improved. Meanwhile, the unsprung mass of the vehicle is reduced, and the riding comfort and control stability of the vehicle are improved.

The invention discloses building material hardness detection equipment which comprises a rack, a workbench, a lifting frame and a lifting mechanism and further comprises a mounting frame. The two ends of the mounting frame are connected with the lifting frame through overload protection mechanisms correspondingly, a pressure sensor is connected to the lower portion of the mounting frame, and a fixing piece is connected to the lower portion of the pressure sensor. A pressing head is connected below the fixing piece. Each overload protection mechanism comprises a bottom plate, an I-shaped piece, a reset assembly, a pair of floating pieces and a pair of resistance increasing assemblies, the bottom plate is fixedly installed on the lifting frame, the I-shaped piece is fixedly arranged on the bottom plate, a pair of extension rods connected to the end of the mounting frame abut against the two side walls of a stand column part of the I-shaped piece respectively, the floating parts are symmetrically and slidably arranged on the two sides of the I-shaped part, the resistance increasing assemblies correspond to the floating parts in a one-to-one mode, and the reset assembly is used for carrying out reset operation on the overload protection mechanisms. When pressure is too large, the pair of overload protection mechanisms can act to enable the mounting frame to move upwards relative to the lifting frame, and the overload protection effect on parts of equipment is achieved.

The invention discloses an electric control locking mechanism for a tail door and belongs to the technical field of vehicles. A transmission part of the locking mechanism is of a hinge structure, and when a spring bolt is blocked by a barrier or too much resistance in the moving process, a connection rod part of the locking mechanism can play a role in overload protection. The locking mechanism comprises a front locking rod structure, a rear locking rod structure and a locking base structure. The output end of a two-way electric cylinder is hinged to the front locking rod through a hinge pin. The front locking rod is hinged to the rear locking rod through a hinge pin. The whole mechanism has the characteristic of being convenient and fast to assemble and disassemble, has great self-adjusting and self-adaption capacities specific to machining allowance of field assembling, and has the remarkable capacity of improving the locking tightness of the door.

The hydraulic oil cylinder for the truck cab comprises an oil cylinder body, a connecting lug seat and a connecting lug shaft, the oil cylinder body is of a cylindrical structure, the connecting lug seat is installed at the left end of the oil cylinder body through a screw, the connecting lug shaft is detachably installed at the right end of the oil cylinder body, and installation holes are formed in the middle of the connecting lug seat and the middle of the connecting lug shaft. The problems that when an existing hydraulic oil cylinder is used, the overload protection function cannot be achieved usually, when an oil pipe explodes due to large bearing capacity, the hydraulic oil cylinder drives a truck head to fall instantly, and maintenance personnel below the truck head easily have large potential safety hazards can be solved, and meanwhile when the existing hydraulic oil cylinder is used, the maintenance personnel cannot fall off instantly. The piston rod is prone to eccentricity due to uneven stress, so that a sealing ring on the outer side of the piston rod is seriously abraded, and the hydraulic oil cylinder leaks oil.

The invention discloses a dual-motor electric power steering system and a power steering method thereof. In the system, a first steering shaft is connected under a steering wheel, and the first steering shaft is connected with a second steering shaft through a universal joint. A steering wheel torque and angle sensor is arranged below the steering wheel for detecting torque and steering wheel angle signals acting on the steering wheel. The main motor and the auxiliary motor are coaxial and connected through a coupling. The output end of the main motor is connected in parallel with the second steering shaft through a torque coupler. The output of the torque coupler is connected to the steering gear via a third steering shaft. According to the magnitude of the required auxiliary torque, themain motor and the auxiliary motor are controlled to always each bear half of the auxiliary current, and the torque is output at the same time, so as to meet the demand of the commercial vehicle for larger torque, improve the fuel economy of the commercial vehicle, and reduce the transportation cost, by setting two coaxial auxiliary motors connected through the coupling.

The invention discloses a hydraulic free lifting device, comprising a main body box, the outer end of the main body box is provided with a support seat, and the support seat is fixedly connected in the main body box, and the outer surface of the main body box is provided with a power distribution box. box, and the distribution box is fixedly connected in the main box, and the outer surface of the distribution box is provided with a transmission tube, and the transmission tube is embedded in the distribution box. This kind of hydraulic free lifting device has a simple structure. It is easy to operate, equipped with a hydraulic pump station, and there is an overflow valve in the hydraulic pump station, and the hydraulic pump station is connected to the handle. This structure is conducive to the emergency descent of the machine when the power is cut off. The descent can be manually controlled by the handle, which greatly improves the original It has the function that the machine cannot be emergency when the power is cut off, which reduces the failure rate. Because there is an overflow valve inside, it can prevent the system from being too pressured when it is running upwards, and it plays the role of overload protection.

The invention relates to the technical field of power equipment, and discloses an overload protection device for distribution transformers of low-voltage distribution lines, including a transformer, the top of the transformer is fixedly connected with a controller, and the inside of the controller is fixedly connected with a breaker The control hook is movably connected inside the breaker, the control spring is connected to the outer socket of the control hook, the connecting rod is fixedly connected to the outside of the control hook, and the first connecting rod is fixedly connected to the inside of the breaker A contact block and a second contact block, the outside of the first contact block and the second contact block are hingedly connected with a contact pressure plate, the bottom of the contact pressure plate is fixedly connected with a pressure plate spring, and the outside of the first contact block is movably connected The loaded electromagnet is used in conjunction with the control hook, the control spring, the connecting rod, the first contact block and the second contact block, so as to ensure the smooth and timely disconnection of the main circuit, avoid faults, and effectively avoid circuit burnout and equipment damage .

The invention relates to a detachable pre-cutting stirrer. The detachable pre-cutting stirrer is characterized in that the detachable pre-cutting stirrer comprises a stirring tank body, a stirring assembly, a supporting assembly, a press cutting assembly and a power assembly, and the stirring assembly is positioned in the stirring tank body; and the power assembly is positioned on the support assembly and is connected with the stirring assembly through a stirring drive shaft, the power system of the press cutting assembly is positioned on the support assembly, the press plate of the press cutting assembly is positioned in the tank body, the stirring assembly comprises a stirring blade suite and a drive shaft, the stirring blade suite is connected with the drive shaft through self-tightening bolts, and the stirring blade suite is transversely fixed to the bottom end of the drive shaft through six self-tightening bolts.

The invention provides an overload protection device of a torque driver. The overload protection device of the torque driver comprises a spline disc (1) and a group of arc-shaped reeds (2), wherein alocking notch (4) is formed in the end portion of one end of each arc-shaped reed (2) while a connecting portion (2b) connected to and matched with a belt wheel is arranged on the end portion of the other end; the device is characterized in that a group of mounting grooves (1g) are uniformly formed in the spline disc (1), a holding rack (2b) is arranged in each mounting groove (1b), the end portion of one end of each arc-shaped reed (2) is inserted into the corresponding holding rack (6), a pre-tightening plate (5) is arranged on each arc-shaped reed and a gasket (7) is arranged below each arc-shaped reed, and the pre-tightening plate (5), the locking notch (4), the gasket (7), the holding rack (6) and the spline disc (1) are fixedly connected together trough a rivet (3). The device provided by the invention is simple in structure, convenient to manufacture and low in cost, and a compressor stops working by isolating the reeds from dowels, so that an overload protection effect is exerted.