132results about How to "Increase exercise" patented technology

The invention discloses a switched reluctance motor for a chef machine, and particularly relates to the technical field of switched reluctance motors, the switched reluctance motor comprises a protective shell, the protective shell is provided with a regulation and control assembly, the regulation and control assembly comprises a base plate arranged in the protective shell, the top of the base plate is provided with a stator, and the bottom of the stator is rotatably connected with an extension rod; the extension rod is installed on the base plate through a bolt. According to the invention, by continuously changing the current in the stator, the reinforced rotor rod and the connecting shaft can continuously move, so that the reinforced magnetism-increasing sheets can be close to the connecting disc, and then the reinforced magnetism-increasing sheets extend between the two adjacent induction magnetic blocks, so that the magnetic field can be enhanced by the induction magnetic blocks and the reinforced magnetism-increasing sheets, and the voltage is kept unchanged; the waveform width, the peak value and the effective value of the current are changed, so that the output torque is influenced, and the torque of the rotor rod and the connecting shaft is further enhanced.

The invention discloses a high-toughness biodegradable material for film blowing forming and a preparation method of the high-toughness biodegradable material, and belongs to the technical field of biodegradable materials. Comprising 50-60 parts of polyethylene, 8-16 parts of poly (butylene adipate / terephthalate), 6-12 parts of polylactic acid, 4-9 parts of self-made nano silicon dioxide modified lignin, 3-8 parts of modified nano calcium carbonate, 1-2 parts of a plasticizer, 3-5 parts of a compatilizer, 0.2-1 part of a lubricant, 0.3-1.5 parts of carbon black and 0.2-0.8 part of an antioxidant. According to the material for film blowing forming, the self-made nano silicon dioxide modified lignin and the modified nano calcium carbonate are compounded for use, so that the material has ultrahigh toughness, and by adding the poly (butylene adipate-co-terephthalate), the polylactic acid and the lignin, the positive effect on the biodegradability of the material is achieved; therefore, a relatively good biodegradation effect is achieved.

The invention relates to a method for eliminating residual stress in additive manufacturing of nickel-based superalloy, and relates to the technical field of additive manufacturing materials. According to the main technical scheme, stress relief treatment is carried out in the mode that continuous pulse current treatment is applied to the additive manufacturing nickel-based superalloy, so that at least part of residual stress in the additive manufacturing nickel-based superalloy is eliminated, and the additive manufacturing nickel-based superalloy subjected to stress relief treatment is obtained. According to the method, the residual stress in the additive manufacturing nickel-based superalloy can be effectively reduced. According to the method, the internal structure state of the original alloy is not changed, meanwhile, the method is low in treatment temperature, short in treatment time, more efficient and more energy-saving, and the requirement for green and sustainable development of the current industry is met.

The present invention relates to the technical field of titanium tube processing, and in particular to a device for boring inner diameters of titanium tubes, comprising a workbench, a clamping seat is provided on the workbench, a clamping mechanism, a rotating mechanism, and a cooling mechanism are provided on the clamping seat, the clamping mechanism is used to clamp the titanium tube, the rotating mechanism is used to rotate the clamping mechanism, and the cooling mechanism is used to inject coolant into the titanium tube; a tool holder and a driving mechanism are also provided on the workbench, a boring bar is detachably connected to the tool holder, a boring tool for processing the inside of the titanium tube is detachably connected to the boring bar, the tool holder is slidably connected to the workbench and driven by the driving mechanism, and the driving mechanism drives the tool holder to slide toward the clamping seat along the length direction of the workbench. The tool holder only needs to drive the boring bar to perform linear motion to process the inside of the titanium tube, and during processing, it only needs to move the tool holder along the titanium tube, so the processing accuracy and processing efficiency are high.

The utility model relates to the field of rehabilitation training, in particular to a postpartum recovery training device for gynaecology and obstetrics. According to an existing postpartum recovery training device, a puerpera exerts force incorrectly, the effective rehabilitation exercise effect is difficult to achieve, adjustment is difficult to conduct according to the condition of the puerpera, and the rehabilitation exercise effect is poor. A postpartum recovery training device for gynaecology and obstetrics comprises a bottom frame, a sliding rail, a sliding block and the like. A sliding rail is fixedly connected to the upper portion of the bottom frame, two sliding blocks are connected to the sliding rail in a sliding mode, the two sliding blocks are symmetrically arranged, and bearing plates are fixedly connected to the tops of the two sliding blocks. When the two legs of the puerpera clamp inwards, the two bearing plates, the two sliding blocks, the two push plates and the two extrusion blocks can be driven to move in the direction close to each other until the two bearing plates are in contact, so that when the puerpera moves the legs, the legs need to apply force inwards to clamp the legs, the pelvic floor muscles of the puerpera are exercised more effectively, and a better rehabilitation effect is achieved.

The utility model relates to the technical field of container breeding, and discloses a container quantitative feeder which comprises a box body and a material storage tank arranged at the top of the box body, a water inlet is formed in the bottom of the box body, a material distributing device is communicated with the lower portion of the material storage tank and comprises a driving device and a frame body, the frame body is communicated with the material storage tank, and the driving device is connected with the driving device. A rotatable material distributing disc is arranged in the frame body, the driving device drives the material distributing disc to rotate, a plurality of grooves are evenly formed in the edge of the material distributing disc, the edge of the material distributing disc except the groove parts is tightly attached to the frame body, a discharging port is formed in the bottom of the frame body, and the width of the discharging port is larger than or equal to the width of the grooves. By means of the design, the feeding amount can be controlled by controlling the rotating angle or the number of turns of the material distributing disc, quantitative feeding is achieved, fishes can be in a reverse flow state in the feeding process, and the fish feeding device conforms to the life habits of the fishes.

The present invention discloses a method for cultivating activated sludge for efficiently treating coking wastewater. The present invention adopts bio-fortified strains and rice husk biochar to prepare a microbial immobilization carrier, and the carrier is added to a simulated coking wastewater activated sludge treatment system to form bio-fortified activated sludge, which is successively added to simulated coking wastewater with gradually increasing phenol concentration, simulated coking wastewater with gradually increasing nitrogen-containing heterocyclic compound concentration, and simulated coking wastewater with gradually increasing polycyclic aromatic hydrocarbon concentration for three times of acclimation to obtain activated sludge after the third acclimation, and the activated sludge is applied to treat simulated coking wastewater. The activated sludge after the third acclimation of the present invention can simultaneously and efficiently degrade multiple target pollutants in the simulated coking wastewater.

The utility model relates to the field of knitted fabric processing, in particular to a knitted fabric dyeing device which comprises a mixing barrel, a stirring barrel, a stirring assembly, a conveying roller and an aeration pipe, the stirring barrel is arranged on the left side of the mixing barrel, the bottom of the stirring barrel is communicated with the bottom of the mixing barrel, the stirring assembly is arranged on the stirring barrel, and the conveying roller is arranged on the stirring assembly. A filter screen is arranged in the stirring barrel, the upper end of the stirring barrel is connected with the upper end of the mixing barrel through a guide pipe, the lower end of the guide pipe is located above the filter screen, a water pump is arranged on the guide pipe, a plurality of groups of conveying rollers are alternately arranged left and right and vertically at intervals, air channels are formed in the conveying rollers, and air inlet pipes are arranged at the ends of the air channels. The aeration pipes are connected to one side of the conveying roller at intervals and communicate with the cavity channel, and a plurality of air outlet holes are annularly formed in the aeration pipes in an array mode, so that the mixing uniformity of the dye is improved, and the dyeing efficiency of the knitted fabric is improved.

An elliptical machine for strengthening and exercising legs comprises a base, two connecting rod assemblies and two grab rails, a base rod and two vertical rods are arranged on the base, the two vertical rods are located on the rear side of the base rod, the tops of the two vertical rods are transversely and fixedly connected with a first shaft rod, a connecting rod is arranged between the first shaft rod and the upper portion of the base rod, and the connecting rod is connected with the grab rails. A second shaft rod is transversely and fixedly connected to the connecting rod, a stand column is connected to the top of the base rod, a third shaft rod is transversely and fixedly connected to the lower portion of the stand column, a belt wheel is arranged on the right side of the base rod, a rotating shaft penetrates through the upper portion of the base rod and penetrates through the belt wheel, and cranks are connected to the left end and the right end of the rotating shaft correspondingly; one side surface of the crank is connected with a pivot; a pedal connecting rod is pivoted to the front end of the connecting rod assembly, and a pedal connecting plate is pivoted to the upper portion of the pedal connecting rod; a rotatable flywheel is arranged on the base, and the belt pulley is in transmission connection with the flywheel. The leg exerciser can strengthen the exercise of different parts of the legs.

The invention relates to the technical field of gene engineering, in particular to construction and application of a fusion gene for coding a green fluorescence labeled nerve growth factor fusion protein with biological activity. The nucleotide sequence of the fusion gene and the amino acid sequence of the fusion protein are respectively shown as SEQ ID No.1 and SEQ ID No.2. The invention also relates to methods for constructing an expression plasmid containing the nucleotide sequence of the fusion gene, preparing a virus vector and the like. The fusion gene can be expressed into a nerve growth factor fusion protein with green fluorescence in cells cultured in vitro and animal bodies, so that the expression and distribution of the fusion gene in the cells and tissues can be directly observed under a fluorescence microscope, and the fusion protein still has the biological activity of the nerve growth factor. The nerve growth factor in the fusion protein can be accurately metered by measuring the fluorescence intensity of the fusion protein or the content of the fusion protein.

The embodiment of the invention discloses a data processing method and device, electronic equipment and a storage medium. According to the starting and ending states of the system and an initial response time matrix, the joint state and the control force of each joint in the system at each moment are determined, and the initial response time matrix comprises the motion type of each joint in the system at each moment; determining a total cost function corresponding to the joint according to the motion type of the joint; according to the total cost function corresponding to all the joints and the joint state and the control force at each moment, a dynamic energy function of the system is constructed; recalculating the initial response time matrix by adopting a dynamic energy function of the system to obtain an updated response time matrix; based on the updated response time matrix, new joint states and control forces of all joints in the system at all moments are determined, and the new joint states and control forces are used for controlling movement of all the joints in the system. The joint state and the control force obtained by the method can improve the movement effect of the system.

The present invention provides a method and device for polishing the inner surface of a pipeline with magnetic force assistance and a rotating fluid, and belongs to the field of mechanical technology. The polishing device includes a working platform, a fluid processing unit, a vibration unit, a magnetic control unit and a spiral guide unit. The fluid processing unit is symmetrically installed on both sides of the working platform, and the two ends of the workpiece are connected to the fluid processing unit; the spiral guide unit is a spiral rod with magnetic conductivity, which is located inside the workpiece, and the spiral structure on the surface of the spiral rod guides the polishing liquid from the original axial linear motion to the spiral feeding motion along the pipe wall, thereby improving the polishing efficiency. The present invention uses a magnetic force-assisted rotating fluid polishing device on the inner surface of the pipeline for polishing, which can achieve rapid and uniform polishing of the inner surface of a straight pipe and a pipe with variable roughness, thereby reducing the along-the-way resistance of the medium in the pipe, improving the sampling accuracy, and enhancing the stability of the fluid in the pipe, solving the problems of limited polishing of the inner surface of existing slender pipes, uneven processing, and low processing efficiency.

The utility model discloses a sports training tensile force ware, including the tensile force board, the lateral wall of tensile force board is established with T type groove, the inner wall sliding connection of T type groove has the mounting block, the both sides fixed connection of mounting block have the lug, the bottom fixed connection of mounting block has the tensile spring, the upper end of tensile force board is established with the mounting hole, the mounting hole is slidingly connected with the mounting bracket. Through setting mounting block and mounting bracket etc. component in the utility model, by screwing off the nut of mounting bracket bottom, at this moment, the mounting bracket is lifted up, two mounting blocks are slid to two tensile force boards respectively, the lug of its both sides also slides to the inside of T type groove, then the mounting bracket is inserted from the mounting hole and slides to the bottom end of tensile force board, the nut is screwed on the bolt, the mounting block is fixed on tensile force board, and the training intensity is adjusted through the mounting block on tensile force board, so as to satisfy the demand of different users.

The utility model discloses a physical training device for sports, and relates to the technical field of physical training. The device comprises a base, two V-shaped plates are arranged on the upper side of the base, a fixing rod is arranged on one side of each V-shaped plate, the two ends of each fixing rod are elastically and rotationally matched with rotating cylinders, and rotating plates are arranged on the peripheral sides of one ends of the rotating cylinders; the two cross-shaped plates are arranged on the upper side of the base in a sliding fit mode, two traction ropes are arranged between the cross-shaped plates and the rotating cylinder, and balancing weights are arranged on the upper sides of the cross-shaped plates. Through the arrangement of the cross-shaped plate, the cross-shaped plate repeatedly moves up and down under the action of the traction rope, so that the cross-shaped plate drives the balancing weights to carry out physical training, the weight needed by an exerciser during exercise is adjusted by adjusting the number of the balancing weights, and the exercise process of the exerciser is more convenient.

The invention relates to a metal rubber and particle damping mixed rotary vibration isolator which comprises an outer shell, a pair of spring assemblies distributed up and down is arranged in the outer shell in the axial direction, and a metal rubber-particle damping container is arranged between the pair of spring assemblies. A rotating piece capable of stirring the damping particles during rotation is arranged in the metal rubber-particle damping container; a supporting shaft moving up and down in the axial direction is arranged in the outer shell, the supporting shaft penetrates through the pair of spring assemblies and the metal rubber-particle damping container, and the supporting shaft drives the rotating piece to rotate when moving up and down. The spring, the metal rubber and the damping particles are combined, the characteristics of large damping, high elasticity, good thermal stability and adjustable damping of the metal rubber are utilized, energy is dissipated in the vibration isolation process, and the effective inhibition effect on vibration is achieved; and in addition, the collision motion of the damping particles has high energy consumption, damping and adjustable mass, so that the whole vibration isolation system can effectively control low-frequency vibration in a relatively large bandwidth range.

The utility model discloses a multifunctional restraining glove which comprises a glove body, a restraining belt, a grip ball and a tightening device, the glove body is integrally connected with finger separating sleeves of four fingers, a hole is formed in the position, corresponding to the ring finger, of the glove body, the end of each finger separating sleeve is open, and a groove is formed in the position, corresponding to the hand back, of the glove body. A grip ball is sewn and connected to the position, corresponding to the palm center, of the glove body, and an elastic rope is sewn between the side, facing the grip ball, of each finger separating sleeve and the grip ball. A finger ring is fixedly arranged at the end of each finger separating sleeve in a sleeved mode, a guide pipe is fixed to the bottom of the grip ball, four pulling ropes with different lengths penetrate through the guide pipe, one end of each pulling rope is fixed to one finger ring, the other ends of the four pulling ropes are movably fixed to a tightening device, and the tightening device is fixed to a binding belt. The glove has the advantages that the elastic rope of the glove body limits the moving space from fingers to the grip ball, so that the fingers are prevented from moving randomly while moving and exercising of the fingers are facilitated, and an infusion tube is prevented from being struggled off.

The present invention relates to a bidirectional drip irrigation system for planting Dendrobium officinale or Anoectochilus roxburghii. The system comprises a forward infusion device and a reverse infusion device, wherein the forward infusion device comprises a first liquid storage tank and a forward flow guide tube, and the reverse infusion device comprises a second liquid storage tank and a reverse flow guide tube. The liquid flows in the forward flow guide tube and the reverse flow guide tube in opposite directions, and the forward flow guide tube and the reverse flow guide tube are interconnected through a drip irrigation device. The drip irrigation device is multiple and each device is provided with an anti-blocking device. The present invention adopts a bidirectional flow channel design, and utilizes the impact force between water flows in different directions to generate greater instantaneous kinetic energy, so that the water in the water flow and the nutrient solution attached thereto can be more fully mixed before being irrigated to the roots of the crops. At the same time, the kinetic energy generated by the impact of the bidirectional water flow can act on the anti-blocking device to promote its operation.

This invention discloses the application of *Lactobacillus plantarum* TWK10 in the preparation of health foods or drugs that enhance exercise motivation. *Lactobacillus plantarum* TWK10, with its Latin name *Lactobacillus plantarum*, was deposited on June 27, 2022, at the China General Microbiological Culture Collection Center (CGMCC), located at No. 3, Courtyard 1, Beichen West Road, Chaoyang District, Beijing, with accession number CGMCC NO. 25190. This invention fills a technological gap in the field of probiotics for sports psychology intervention, providing a new strategy for "physiological-psychological" dual-effect intervention in sports nutrition, and can be further applied to weight management.

The invention relates to the technical field of electric shifting machines, and discloses a convenient-to-install electric shifting machine which comprises a base support, the side wall of the base support is fixedly connected with an L-shaped support, the side wall of the L-shaped support is fixedly connected with an installation assembly, and the installation assembly comprises a supporting frame fixedly connected with the outer wall of the L-shaped support. The outer wall of the supporting frame is fixedly connected with a controller, the output end of the controller is in signal connection with an electric push rod, the bottom of the electric push rod is fixedly connected with the top of the L-shaped support through a hinge, the output end of the electric push rod is movably connected with a rotating block through a hinge, and the side wall of the rotating block is fixedly connected with a transverse rod; by arranging the mounting assembly, when the arm supporting height of a patient needs to be adjusted, an operator can start a controller to promote an electric push rod to be started, so that a rotating block is lifted upwards, the lifting height of a handrail is increased, and the arm of the patient can be conveniently supported.

The application belongs to the field of batteries and relates to a blended polymer full solid-state electrolyte containing nano-powder rubber, a preparation method of the blended polymer full solid-state electrolyte and a lithium ion battery. The full solid-state electrolyte comprises a polymer blend, a lithium salt and nano-powder rubber; the polymer blend comprises polyacrylonitrile and polypropylene carbonate; the weight content of the polymer blend is 25-70%, the weight content of the lithium salt is 20-50% and the weight content of the nano-powder rubber is 3-35% based on the total weight of the full solid-state electrolyte. The full solid-state electrolyte has higher conductivity and better cycle performance.

The invention discloses an emotional assistant health behavior intervention dialogue robot based on self-consciousness emotion recognition. The emotional assistant health behavior intervention dialogue robot at least comprises a health behavior information acquisition module, a man-machine dialogue module, a self-consciousness emotion recognition module and a behavior intervention module. By combining a self-consciousness emotion recognition technology with a large model interaction technology and a behavior intervention psychological model, the system can improve the fine granularity of health behavior intervention in the aspect of emotion understanding, and further realizes more accurate and personalized intervention services. The system not only can promote the change of health behaviors, but also can provide a common intervention service, so that the health management ability of the user is effectively improved, and the durability and effect of behavior change are enhanced.

The invention discloses a multifunctional exercise device for rural old-age care, and relates to the technical field of old-age care exercise, the multifunctional exercise device comprises a supporting assembly, and the supporting assembly is connected with two movable assemblies, two brake assemblies, a seat plate, a lifting assembly, a pull-push assembly and two moving assemblies. Through the arrangement of the side supporting assembly, the movable assembly, the brake assembly, the seat plate, the lifting assembly, the pull-push assembly and the moving assembly, the device can have an exercise mode for legs and upper limbs when old people exercise, so that the device can have multiple exercise modes, the old people are prevented from moving repeatedly, and the exercise efficiency is improved. And secondly, a moving assembly on the device can move to cope with the exercise of the old people, and meanwhile, the device has the transfer effect when the old people are inconvenient to move, so that the device can be conveniently used for the exercise of the rural old people.

The present invention proposes a fish-dividing water-adjusting system, comprising: a clear water pool, which comprises a first pool, a second pool, and a plurality of swimming lanes arranged in parallel between the first pool and the second pool and connecting the two, and a first gate is provided at the port at one end of the swimming lane for only a single fish to swim into the swimming lane, and a second gate is provided at the port at the other end of the swimming lane for only a single fish to swim out of the swimming lane; a water pumping device, which is used to control the water flow from one end of the swimming lane to the other end thereof, and to make the flow direction opposite to the direction in which the fish swim into the swimming lane. The present invention can force the fish to swim in different lanes, thereby ensuring the uniformity of the amount of movement between individual fish; at the same time, the water flow direction is opposite to the swimming direction of the fish, so as to improve the water adjustment effect by increasing the resistance of the fish's swimming and enhance the amount of movement of the fish.

The utility model provides an aeration system suitable for MBBR (Moving Bed Biofilm Reactor) filler, and relates to the technical field of sewage treatment. The bottom of the aeration system reaction tank is provided with a telescopic bracket, and the top of the aeration system reaction tank is provided with a lifting assembly; the aeration structure comprises a main aeration pipe and an air distribution pipe, the air distribution pipe is installed on the telescopic support and connected with the lifting assembly, the main aeration pipe is connected with the air distribution pipe through a telescopic pipe, a plurality of jet aerators are arranged at the top of the air distribution pipe, aeration synergistic releasers are arranged on the jet aerators, and filler blocking nets are arranged on the outer sides of the jet aerators; the compression fan is connected with the aeration main pipe through an air supply pipe, and a filter unit is arranged on the air supply pipe. According to the aeration system, the aeration uniformity can be improved, and the sewage treatment efficiency and treatment effect are improved.

The present invention provides a breeding device for preventing thoracic bursitis in jute chickens and a suitable ecological breeding method. According to the growth characteristics and breeding needs of jute chickens, the living space of jute chickens is gradually expanded. When the jute chickens enter the rapid growth period, the breeding space is gradually expanded. After the body shape of the jute chickens is basically finalized, the isolation board can be appropriately reduced, so that the jute chickens can increase their activity in the special breeding device. The device used includes a frame and a conveyor belt. The middle part of the frame is provided with a conveyor belt, and the conveyor belt is provided with a bottom plate. The two ends of the bottom plate are movably connected to the frame. The breeding method used is between cage breeding and free-range breeding, which saves costs compared with free-range breeding, has a large breeding density, is easy to implement breeding and epidemic prevention measures, and has a low probability of thoracic bursitis. It belongs to an ecological breeding method in the field of poultry breeding and has wide applicability.

The utility model relates to the technical field of pilates core beds, in particular to an adjustable pilates core bed. Comprising a bed frame, a sliding trolley is slidably arranged on the bed frame, a supporting frame is fixedly arranged on the bed frame, soft cushions are fixedly arranged on the top of the sliding trolley and the top of the supporting frame, and a plurality of tension springs are arranged between the sliding trolley and the bed frame; connecting assemblies are arranged at the two ends of the tension spring, and the two connecting assemblies are rotationally connected with the sliding trolley and the bed frame in a threaded mode; a pressure rod is rotationally arranged on the supporting frame, two braking assemblies are arranged on the pressure rod, and the two braking assemblies brake rotation of the pressure rod. Height adjusting assemblies are fixedly arranged on the two sides of the bed frame, a hanging rod is fixedly arranged between the two height adjusting assemblies, and two pull rope handles are connected to the hanging rod in a hung mode. According to the pilates core bed, the tension springs are not prone to falling off when being connected with the sliding trolley and the bed frame, and the angle of the pressure rod and the height of the pull rope handle can be adjusted.

The utility model provides an inclined strut core-pulling mechanism and an injection mold, the inclined strut core-pulling mechanism comprises a movable mold insert, a clamping piece and a driving assembly, the clamping piece comprises a first inclined strut and a second inclined strut, and the first inclined strut and the second inclined strut are both provided with fastening ends; the clamping piece and the movable mold insert are in sliding connection in the first direction so that the two fastening ends can get close to each other in the second direction to release a product or get away from each other to support the product, the first direction is perpendicular to the second direction, the ends, away from the product, of the first inclined strut and the second inclined strut are hinged to the driving assembly, and the driving assembly can drive the clamping piece to move in the first direction.

The present application belongs to the technical field of polyurethane / polyurea, and discloses a stress change material and a preparation method thereof. The stress change material comprises hydrophobic segments and hydrophilic segments. The stress change material can change in size in two ways under water stimulation: one is to absorb a large amount of water to induce rearrangement of the hydrophilic segments, so as to realize volume expansion; the other is to absorb a small amount of water as a plasticizer to promote the movement of the segments, so as to realize shape recovery. Meanwhile, due to the introduction of the hydrophobic segments, the polyurethane / polyurea can still maintain sufficient mechanical strength in a water environment, thereby widening the application range of the material.

The utility model discloses a saddle-free bicycle, and mainly relates to the technical field of bicycles. Comprising a front fork, a Y-shaped frame and a rear axle frame, a V-shaped opening matched with a front wheel is formed in the front end of the Y-shaped frame, a central shaft is arranged on the front wheel, locking nuts are arranged at the two ends of the central shaft, a U-shaped frame matched with the front wheel is arranged at the bottom of the front fork, the U-shaped frame is installed on the V-shaped opening of the Y-shaped frame through the central shaft, and the rear axle frame is arranged on the rear axle frame. A pedal mechanism is arranged in the middle of the Y-shaped frame, the pedal mechanism and the front wheel are in transmission through a chain, a rear axle is horizontally arranged on the rear axle frame, the rear axle frame is hinged to the Y-shaped frame through a hinge piece, the axis of the hinge piece is perpendicular to the rear axle, springs are arranged on the left side and the right side of the hinge piece, one end of each spring is connected with the rear axle frame, and the other end of each spring is connected with the rear axle frame. Rear wheels are arranged at the left end and the right end of the rear axle; the utility model has a simple structure, is convenient to use, and can reduce the occupation of storage space.