31results about How to "Action Responsive" patented technology

The invention discloses a wheel lifting and folding device which comprises a hydraulic motor, a rotary switch, an electronic control valve A, an electronic control valve B, a rotary arm, a shock absorber, rocker arms, a hub assembly, rocker arm mounting seats and a hydraulic motor mounting seat, wherein one end of the rotary arm is fixedly mounted on the output shaft of the hydraulic motor and the other end of the rotary arm is connected with the upper end of the shock absorber; the lower end of the shock absorber is orderly sleeved on one of the rocker arms; one end of each rocker arm is respectively orderly connected with the hub assembly and the other end of each rocker arm is respectively orderly connected with the corresponding rocker arm mounting seat; and each rocker arm mounting seat and the hydraulic motor mounting seat are respectively orderly and fixedly mounted on a vehicle frame. The wheel lifting and folding device has the advantages of scientific design, simple structure, quick action and reliable performance. When a vehicle enters water for float-traveling, wheels can be quickly lifted and folded to leave the water surface through the wheel lifting and folding device, so as to significantly reduce the resistance when the vehicle travels in the water. The wheel lifting and folding device can better meet the urgent need of developing and manufacturing multi-wheel amphibious vehicles at home and abroad.

The invention discloses a wrist wear type automatic inflation buoyancy life-saving ball. The wrist wear type automatic inflation buoyancy life-saving ball comprises a wrist band, an air bottle and an inflation air bag. A main shell is arranged on the outer side of the wrist band. An installing hole is formed in the main shell in the length direction of the main shell. One end of the installing hole is connected with an air bottle opening of the air bottle. An ejector pin capable of moving in the length direction of the installing hole is sleeved with the installing hole. The end, close to the air bottle, of the ejector pin is provided with a pin tip for puncturing a close cover of the air bottle. The end, located on the pin tip, of the installing hole is provided with an air outlet, and the air outlet is communicated with an outlet of the air bottle and communicated with the inflation air bag through an air pipe. The pin tip of the ejector pin is sleeved with a reset spring, when the reset spring is in an initial state, the pin tip is located in the station making no contact with the close cover of the air bottle, and when the reset spring is located in a compression state, the pin tip is located in the station where the close cover of the air bottle can be punctured. The wrist wear type automatic inflation buoyancy life-saving ball is simple in structure and convenient to operate and carry, the defect that traditional life-saving equipment is heavy is effectively overcome, and risks of water activities are effectively reduced.

The invention relates to a device for punching double-skeleton-class products in a linkage manner through movement of air cylinders. The device comprises an assembly connecting plate, a sliding block and a cutter fixing plate. A pushing air cylinder, a female die and a fixing base are transversely installed on the upper end face of the assembly connecting plate from left to right. A right end extending rod of the pushing air cylinder is connected with the sliding block horizontally sliding along the upper end face of the assembly connecting plate. A switch pin is arranged on the right side wall of the sliding block. A punching air cylinder is installed on the left side wall of the upper end of the fixing base, and a lower end extending rod of the punching air cylinder is connected with the cutter fixing plate. A plurality of cutters are installed on the side wall of the cutter fixing plate. The female die is fixed to the left side of the fixing base, located below the cutters and meanwhile provided with a through hole corresponding to the switch pin. A mechanical valve is installed on the right side of the through hole. The device has the beneficial effects of being convenient to install, simple in structure, sensitive in movement response, high in automatic degree and the like; and appropriate adjustment can be carried out according to the requirements of different products to adapt to various kinds of production accordingly.

The invention belongs to a valve design technology, and particularly discloses a nitrogen type water-attack pressure release valve system. The nitrogen type water-attack pressure release valve system comprises a main valve, a pipeline meter, an electric control cabinet, a temperature difference stabilization bottle and a nitrogen source; a main valve inner chamber is connected with the nitrogen source and the temperature difference stabilization bottle through a valve group and pipelines; nitrogen of the main valve inner chamber is supplied by the nitrogen source; a pressure gauge for displaying setting pressure of a water-attack pressure release valve is arranged between the temperature difference stabilization bottle and the main valve inner chamber; and nitrogen pressure in the temperature difference stabilization bottle is the same as nitrogen setting pressure of the main valve inner chamber. The nitrogen type water-attack pressure release valve system is suitable for a conveying pipeline of a high-viscosity and poor-cleanliness medium; when the high-viscosity medium is conveyed, the main valve inner chamber can be filled with nitrogen rapidly, the nitrogen continuousness is good, the main valve acts and reacts sensitively, and the nitrogen type water-attack pressure release valve system is free from influence of the physical properties of the medium and is high in working environment adaptability; and the nitrogen type water-attack pressure release valve system is simple in structure and high in automation degree.

The invention relates to a marine variable-frequency electric crane which comprises a base, wherein a tower body is mounted at the top of the base through a slewing bearing; an arm support is mounted on one side of the tower body; a second tackle pulley is arranged at the head of the arm support; a first tackle pulley is arranged at the upper part of the arm support; one end of a hoisting wire rope is connected with a hoisting mechanism; a lifting hook is connected with the other end of the hoisting wire rope through the second tackle pulley; a variable-amplitude wire rope is connected between a bracket at the top of the tower body and the first tackle pulley; both of a swing mechanism and the hoisting mechanism are controlled by a variable-frequency motor. The marine variable-frequency electric crane has the advantages that the structure is compact and reasonable; the operation is convenient. Compared with the conventional hydraulic crane, as all actuating activities are driven through electric power, the marine variable-frequency electric crane further has the advantages that phenomena such as oil leak are avoided to reduce environment pollution; the reaction is fast; the operation is simple; the safety and stability are good.

The invention discloses a die-pressing lid maker. The die-pressing lid maker comprises a rack, and an extrusion module, a pressing module and a charging-discharging module which are arranged on the rack, wherein the pressing module comprises a rotation body and an oil line assembly body; a first oil line and a second oil line are processed and manufactured on the rotation body; a high-pressure oil line, a low-pressure oil line, a third oil line, a fourth oil line, a fifth oil line and a sixth oil line are processed on the oil line assembly body, so that the oil line assembly is implemented; the oil lines are simple and convenient to process. According to the die-pressing lid maker, the oil lines are controlled by a control valve, so that the low-pressure die assembling and high-pressure molding manners can be adopted during working; the production efficiency of the lid maker is effectively improved; the molding quality of the product is greatly improved; the die-pressing lid maker is reasonable in structural design; the cooling effect of blanks is effectively improved; bottle lids with inner rings which are provided with outer hook parts are molded; in addition, the die-pressing lid maker is capable of quickly and accurately feeding; the convenience is brought to the production.

The invention provides a finger bending status data collecting method. According to the adopted technical scheme, an operator wears a data collecting glove on one hand; a sensor is arranged on the opisthenar position of the glove; data is collected via the change of bending length of the outer side of a finger; and the data collected is transmitted to a control unit for processing. The glove is comfortable to wear and realizes sensitive motions and reactions, and the data collected is accurate.

The invention discloses a screw propeller folding device. The screw propeller folding device comprises an upper transmission box, a transmission shaft outer barrel, a lower transmission box, a screw propeller, a mounting frame, a sleeve, a positioning seat, a short shaft, a swivel arm, a hydraulic cylinder, a hydraulic cylinder seat, a steering rudder, a steering rudder seat, a liner bushing, an inhaul cable and bolts, wherein the upper transmission box, the transmission shaft outer barrel and the lower transmission box are fastened to form a whole body through the bolts; the screw propeller is fixedly arranged on an output shaft of the lower transmission box; rotary folding of the screw propeller can be realized through the hydraulic cylinder; the steering rudder can be controlled throughthe inhaul cable and horizontal steering is realized; the device disclosed by the invention has the advantages of scientific design, compact structure, reliable performance, convenience for mountingand dismounting and low cost; the screw propeller folding device can be mounted at the rear part of a vehicle in a folding manner, and ideal power and reliable steering can be provided for water-surface floating crossing of the vehicle.

A height tracking device for a mechanical underwater arc cutting trolley comprises a fixed platform and a central post, the upper end of the central post is connected with the fixed platform which is connected with a port of a wire feeder, the lower end of the central post is a cylinder, an annular groove is formed in the external circumference of the cylinder, and one end of the annular groove is sequentially sleeved with a snap spring, a three-hole retaining clip, an oil-free lining and a spring from bottom to top; the oil-free lining and a middle hole of the three-hole retaining clip are coaxial, and the oil-free lining is in fastening connection with the three-hole retaining clip through a protruding shoulder arranged at one end and can be moved up and down to be installed on the outer circle of the central post in a sleeving mode; round holes are formed in the two ends of the three-hole retaining clip, a hollow conducting rod is installed in the round hole in one end in a close-fitting and penetrating mode, a fixing rod is installed in the round hole in the other hole in a close-fitting and penetrating mode, and the lower end of the hollow conducting rod is in threaded connection with a hollow conducting nozzle. The height tracking device is applied to arc cutting of an underwater automatic or semi-automatic mechanical trolley, is especially suitable for cutting a three-dimensional space workpiece, and is simple in structure, safe, reliable, convenient to operate and low in manufacturing cost, movement response is sensitive, and tracking adjustment is fast, convenient and accurate.

The invention discloses a propeller folding device, which comprises a transmission upper box, a transmission shaft outer cylinder, a transmission lower box, a propeller, a mounting frame, a sleeve, a positioning seat, a short shaft, a rotating arm, a hydraulic cylinder, a hydraulic cylinder seat, a steering The rudder, steering rudder seat, bushing, cable and bolts, among which the transmission upper box, the outer cylinder of the transmission shaft and the transmission lower box are fastened together by bolts, and the propeller is fixed on the output shaft of the transmission lower box. The rotation and folding of the propeller can be realized, and the steering rudder can be controlled by the cable to realize the steering on the water surface. This device has scientific design, compact structure, reliable performance, convenient loading and unloading, and low cost. Surface floatation provides ideal power and reliable steering.

The invention provides a telescopic car-door sill and a flexing control method, belonging to the technical field of elevator sills and solving the problem that a sill is fixed so as to be inconvenient to install. The telescopic car-door sill is characterized in that a driver is a stepper motor, the stepper motor is provided with an angular rotary shaft, a rotary pushing block is arranged on the angular rotary shaft, and the end of the rotary pushing block is movably connected with the bottom of a shielding plate. When a control cabinet sends an angle rotation signal to the stepper motor, the rotary pushing block rotates, and the shielding plate extends out along a pedal slideway or returns to an initial position along the pedal slideway. According to the telescopic car-door sill and the flexing control method, the interval can be largely reduced, even completely eliminated; the structure is simple, so that sundries are prevented from falling down through the interval; the running of the telescopic car-door sill is safe and reliable.

The invention discloses a rotary control arm device. The rotary control arm device comprises a base, a push-pull rod, a sector gear, a control arm, a central bolt and a hydraulic oil cylinder, whereina rack at the lower end of the push-pull rod is orderly meshed with the sector gear, the central bolt is orderly and fixedly installed on the base, the sector gear sleeves the central bolt, and the control arm 4 is fixedly mounted on the sector gear 3. The device is scientific in design, compact in structure, reliable in performance, convenient to assemble and disassemble, low in cost and capableof being conveniently assembled with multiple kinds of amphibious vehicles and ships; moreover, the water resistance and impact resistance of the device are significantly improved, and the stabilityand safety reliability of the vehicles during floating on a water surface are improved.

The invention discloses a water ski for an amphibious vehicle, which includes a support frame, a water ski, a stand, a handle, a hydraulic cylinder, a pin shaft and a bolt, wherein the support frame consists of a front horizontal bar, (two) vertical bars, The rear cross bar and the tail bar are welded in an orderly manner, the water ski is installed in an orderly manner on the support frame, the upper end of the stand, the upper end of the handle and the upper end of the hydraulic cylinder are respectively fixed in order on the corresponding positions of the frame through bolts, The device can be matched with a variety of amphibious vehicles. It has scientific design, simple structure, reliable performance, and convenient loading and unloading. Make the vehicle present a hydroplaning posture (produce drift effect), which can effectively reduce the water resistance during the vehicle's travel and significantly increase the vehicle's water surface floating speed, so it can better meet the urgent needs of manufacturing and improving amphibious vehicles at home and abroad. need.

The invention relates to a floating ball sliding sleeve device of an energy accumulator, which is mainly characterized in that a cylindrical floating ball body is arranged in a cylinder barrel and can slide up and down in the cylinder barrel; an annular sleeve is also assembled at the outer side of the floating ball body, and an appropriate gap for communicating liquid or gases is arranged between the annular sleeve and the floating ball body; upper through holes and lower through holes are respectively formed on the upper ends and the lower ends of the annular sleeve and the floating ball body; when the floating ball body slides upwards, the upper through holes and the lower through holes are all opened, the liquid or the gases can pass through the gap; and when the floating ball body slides downwards, the upper through holes are closed, and the lower through holes are opened to achieve the effect of a one-way valve.

The invention discloses a die-pressing lid maker. The die-pressing lid maker comprises a rack, and an extrusion module, a pressing module and a charging-discharging module which are arranged on the rack, wherein the pressing module comprises a rotation body and an oil line assembly body; a first oil line and a second oil line are processed and manufactured on the rotation body; a high-pressure oil line, a low-pressure oil line, a third oil line, a fourth oil line, a fifth oil line and a sixth oil line are processed on the oil line assembly body, so that the oil line assembly is implemented; the oil lines are simple and convenient to process. According to the die-pressing lid maker, the oil lines are controlled by a control valve, so that the low-pressure die assembling and high-pressure molding manners can be adopted during working; the production efficiency of the lid maker is effectively improved; the molding quality of the product is greatly improved; the die-pressing lid maker is reasonable in structural design; the cooling effect of blanks is effectively improved; bottle lids with inner rings which are provided with outer hook parts are molded; in addition, the die-pressing lid maker is capable of quickly and accurately feeding; the convenience is brought to the production.

The invention discloses a shock absorber for a supporting wheel train. The shock absorber includes a central shaft, a compression plate, a regulating bolt, a steel spring plate, U-shaped bolts, a swing arm, a supporting wheel shaft and a supporting wheel. The two ends of the steel spring plate are orderly pressed on the supporting wheel shaft, and the compression plate and the steel spring plate can be orderly located and fastened on the central shaft through the U-shaped bolts, and elastic force of the steel spring plate can be conveniently adjusted through the regulating bolt. The device isscientific in design, compact in structure, reliable in performance, convenient to install and disassemble, and low in cost, stretching of a rubber composite track can be controlled better, vehicle shocking caused by the uneven road surface is significantly reduced, and the driving comfort of caterpillar drive vehicles can be improved.

The invention discloses a material cutting and feeding device of a cover making machine. The material cutting and feeding device comprises a rotary table and a plurality of material cutting and feeding modules, wherein a plurality of containing cavities are concavely formed in the periphery of the bottom surface of the rotary table; aiming at each containing cavity, a first air path and a second air path are arranged in the rotary table; the first air path is communicated with the inner part of the upper end of each containing cavity; the plurality of material cutting and feeding modules are uniformly distributed at the peripheral edge of the bottom surface of the rotary table at intervals; each material cutting and feeding module comprises a fixed seat, a cutter, a fixed sleeve shell and a prop shell; the fixed seats, the cutters, the fixed sleeve shells and the prop shells are matched and arranged; blank materials are cut off by using the cutters, and each air path and the cavities are matched so that the prop shells move downwards to realize feeding; a traditional feeding manner of blowing air or adopting a piston head is replaced; the prop shells are hollow bodies so that the movement response is flexible, rapid and accurate feeding can be realized, and convenience is brought to production; meanwhile, the material cutting and feeding device has a simple structure and few parts, and is convenient to assemble and maintain.

The invention relates to a method for side brush of sweep road car escaped from barrier and the anti-attack and retraction mechanism in hydraulic and electrically principle, which is aimed at the problem that side brush of prior sweep road car is destroyed easily, anti-attack mechanism is complex and does on escaped from barrier efficiently. It compounded by mechanism, electricity and hydraulics can make side brush retract immediately when attacked and escape from barrier so as to avoid abnormal failure of side brush as attacking force is transmitted to electrical signal to control inlet direction of oil cylinder by pressure switch and electrical control device. It is provided with sensitive feedback, safety, stability and simple structure.

The invention relates to a device for realizing interlocking punching and cutting of double-skeleton products through the movement of a cylinder, which includes an assembly connecting plate, a slider and a cutter fixing plate. Cylinder, die and fixed seat, push the right end of the cylinder to protrude the rod and connect with the slider that slides horizontally along the upper surface of the assembly connecting plate. The right side wall of the slider is provided with a switch pin, and the upper end of the fixed seat is on the left side wall. A punching cylinder is installed on the top of the punching cylinder, and the lower end of the punching cylinder extends out and connects with the cutter fixing plate. Several cutting knives are installed on the side wall of the cutter fixing plate. Below, at the same time, a through hole corresponding to the switch pin is arranged on the die, and a mechanical valve is installed on the right side of the through hole. The invention has the characteristics of convenient installation, simple structure, sensitive action response and high degree of automation, and can be properly adjusted according to the requirements of different products so as to be suitable for various productions.

The invention relates to a bit lubricating device of a rotary drill rig, and mainly solves the technical problem that a diluted oil transport power source and a coordinated control device are additionally arranged on the existing bit lubricating device of the rotary drill rig. The bit lubricating device of the rotary drill rig comprises a blast main and an oil diluting pipe communicated with the blast main; the other end of the oil diluting pipe is connected to an oil tank of diluted oil; the oil diluting pipe is composed of an oil diluting pipe joint and an oil diluting pipe body; the oil diluting pipe joint is a straight pipe and directly connected with the blast main, and an inclined angle of the oil diluting pipe joint and the flow direction of compressed air in the blast main is an acute angle. The lubricating device is extremely significant in lubricating effect, and sensitive to act and react; an energy source is saved and the operating cost is also reduced due to the fact that the transport power source and the coordinated control device are concealed; furthermore, the bit lubricating device is simpler and compacter in structure, and a finite space of the rig is saved. The bit lubricating device can be applied to the rotary drill rigs with various specifications.

A combined friction clutch brake with low driven system inertia of a mechanical press comprises a press body. The press body is connected with a transmission system composed of a crankshaft and accessories of the crankshaft. A flywheel and a clutch-brake supporting sleeve are installed on the crankshaft, a friction clutch and a friction brake are connected to the clutch-brake supporting sleeve, the friction clutch and the friction brake are provided with rigid interlocking structures, and the friction clutch and the friction brake are connected with a hydraulic pipeline system. The flywheel is driven by a driving motor to move, the flywheel can independently rotate and move on the crankshaft, and the movement and stop of the crankshaft are controlled by using a friction clutch brake. The crankshaft does not need to be machined with a center air hole, and the combined friction clutch brake has the advantages of being low in driven system rotational inertia, small in friction heating amount, good in heat dissipation effect, high in energy utilization rate, compact in structure, coordinated in action, easy and convenient to operate, convenient to maintain, low in noise pollution and the like.

The invention discloses a material cutting and feeding device of a cover making machine. The material cutting and feeding device comprises a rotary table and a plurality of material cutting and feeding modules, wherein a plurality of containing cavities are concavely formed in the periphery of the bottom surface of the rotary table; aiming at each containing cavity, a first air path and a second air path are arranged in the rotary table; the first air path is communicated with the inner part of the upper end of each containing cavity; the plurality of material cutting and feeding modules are uniformly distributed at the peripheral edge of the bottom surface of the rotary table at intervals; each material cutting and feeding module comprises a fixed seat, a cutter, a fixed sleeve shell and a prop shell; the fixed seats, the cutters, the fixed sleeve shells and the prop shells are matched and arranged; blank materials are cut off by using the cutters, and each air path and the cavities are matched so that the prop shells move downwards to realize feeding; a traditional feeding manner of blowing air or adopting a piston head is replaced; the prop shells are hollow bodies so that the movement response is flexible, rapid and accurate feeding can be realized, and convenience is brought to production; meanwhile, the material cutting and feeding device has a simple structure and few parts, and is convenient to assemble and maintain.

The invention relates to an automatic welding and pneumatic clamping and discharging mechanism which comprises an upper template, a lower template, a limiting block and a screw, wherein the lower template is arranged below the upper template; the front side of the lower template is provided with a pair of quick clamp supporting blocks; quick clamps are respectively connected to the quick clamp supporting blocks; the output ends of the quick clamps are fixedly connected with a product clamping block fixing plate in the front; a product clamping block is arranged in a product clamping block fixing plate guide slot; the free end of the product clamping block is positioned in a die cavity formed by a first lower die and a second lower die; the die cavity formed by the first lower die and the second lower die is in a V shape; the outer sides of two shoulders on the top of the V-shaped tip are respectively connected with a clamping block through a slide block; and a pressing block is correspondingly arranged on the upper template above the clamping block. The cylinder action is smoothly finished through up-and-down motion of a die frame, and the mechanism is convenient and safe to mount, simple in structure and sensitive in action response; and moreover, the mechanism can be properly adjusted according to different products, and the technical problem that the welding cannot be finished due to the product with an inverted hook is solved.

The invention relates to a floating ball sliding sleeve device of an energy accumulator, which is mainly characterized in that a cylindrical floating ball body is arranged in a cylinder barrel and can slide up and down in the cylinder barrel; an annular sleeve is also assembled at the outer side of the floating ball body, and an appropriate gap for communicating liquid or gases is arranged between the annular sleeve and the floating ball body; upper through holes and lower through holes are respectively formed on the upper ends and the lower ends of the annular sleeve and the floating ball body; when the floating ball body slides upwards, the upper through holes and the lower through holes are all opened, the liquid or the gases can pass through the gap; and when the floating ball body slides downwards, the upper through holes are closed, and the lower through holes are opened to achieve the effect of a one-way valve.

The invention discloses a high-voltage circuit breaker with a self-locking function and relates to the technical field of circuit breakers. When the voltage output by a transformer is too large, the magnetism of an iron core is enhanced, the iron core adsorbs a sliding block to move upwards, the sliding block drives a second push head to move upwards to drive a rotating rod to rotate anticlockwise, and the rotating rod clamps a first push head through a first push groove to drive a sliding plate to move downwards so as to separate a first contact and a second contact, so circuit breaking is achieved. The sliding plate drives a fixing plate to move downwards, and when the fixing hole moves to be flush with an inserting rod, the inserting rod is inserted into the fixing hole to fix the fixing plate, so the self-locking function is achieved. During unlocking, a pull rod is pushed upwards to drive a turntable to rotate, and the turntable drives a connecting rod and the inserting rod to move leftwards, so the inserting rod and the fixing hole are separated and return to a normal state. Manual unlocking is needed during unlocking, so the transformer is prevented from being still in an overlarge output voltage state after automatic unlocking and the practical safety is ensured. The action response is quick, the reliability is high, the structure is simple, the manufacturing cost is low, the use is convenient, and the practicability is high.

The invention relates to a bit lubricating device of a rotary drill rig, and mainly solves the technical problem that a diluted oil transport power source and a coordinated control device are additionally arranged on the existing bit lubricating device of the rotary drill rig. The bit lubricating device of the rotary drill rig comprises a blast main and an oil diluting pipe communicated with the blast main; the other end of the oil diluting pipe is connected to an oil tank of diluted oil; the oil diluting pipe is composed of an oil diluting pipe joint and an oil diluting pipe body; the oil diluting pipe joint is a straight pipe and directly connected with the blast main, and an inclined angle of the oil diluting pipe joint and the flow direction of compressed air in the blast main is an acute angle. The lubricating device is extremely significant in lubricating effect, and sensitive to act and react; an energy source is saved and the operating cost is also reduced due to the fact that the transport power source and the coordinated control device are concealed; furthermore, the bit lubricating device is simpler and compacter in structure, and a finite space of the rig is saved. The bit lubricating device can be applied to the rotary drill rigs with various specifications.

The invention discloses a foldable movable buoy device, which includes a movable buoy, a rotating arm, a bolt, a mounting seat, a hydraulic cylinder, an oil cylinder seat, a control system, a positioning seat, a positioning plate and a fastening screw, wherein the upper end of the rotating arm It is connected to the side beam of the frame through bolts and mounting seats, and its lower end is connected to the movable buoy in an orderly manner through fastening screws. The upper and lower ends of the hydraulic cylinder are provided with mounting holes, which are respectively set on the pin shaft and the cylinder seat. This kind of device has scientific design, compact structure, reliable performance, convenient loading and unloading, and low cost. It can easily convert ordinary vehicles into special vehicles for amphibious use, so that it has multiple practical functions such as rescue and rescue, leisure and entertainment.

The invention relates to the technical field of carbon-free trolleys, and discloses a pure mechanical low-friction obstacle-crossing double-8 carbon-free trolley. The carbon-free trolley comprises anoperating mechanism, a power mechanism and a steering mechanism. The steering mechanism comprises a transmission shaft, a cylindrical cam, a steering element, a steering slider and a connecting rod shaft. A wavy trajectory groove is formed in the circumferential side of the cylindrical cam. The circumferential movement trajectory of a cam center on the trajectory groove is shaped like half of double-8. The cylindrical cam in the steering mechanism is low in friction loss, high in transmission efficiency and sensitive in action reaction during transmission, is free of climbing phenomenon at a low speed and can effectively reduce the overall size of the trolley in the whole design scheme so that a trolley body can be more compact; the pure mechanical trolley advances on the double-8 trajectory when the cylindrical cam is applied to the carbon-free trolley.