73results about How to "Improve comfort and safety" patented technology

The invention discloses a vehicle obstacle-avoidance path planning research method based on a novel manual potential field method. The research method comprises that a CCD cameras, a millimeter wave radar and a vehicle-mounted sensor collect information needed by vehicle obstacle-avoidance path planning in real time, according to the information needed by vehicle obstacle-avoidance path planning, a road boundary repulsion potential field and obstacle repulsion potential field model based on the manual potential field method is established, a balance equation is established according to the force born by a main vehicle in a composite field formed by the road boundary repulsion potential field and the obstacle repulsion potential field, positional points which the main vehicle pass in the obstacle avoidance process are solved, an obstacle-avoidance path is thus obtained, and the speed of the main vehicle is controlled in the obstacle avoidance process to improve the safety and comfortableness. The research method of the invention is low in computing amount and is convenient to control in real time, and the planned obstacle-avoidance path is safer and more reliable than that planed by a traditional method.

A robotic arm (100) for controlling a movement of a user's arm, said robotic arm forming a kinematic chain extending from a proximal to a distal end and comprising a grip (190) for positioning said user's hand at a distal end, characterised in that the kinematic chain possesses redundancy in a distal region, such that the movement of the user's hand can de decoupled from other parts of the kinematic chain.

The invention discloses a cruising and active adjustable speed limiting system of a vehicle, comprising a cruising-active adjustable speed limiting scheduling function layer, a cruising function layer, a speed limiting function layer and a virtual pedal calculating layer. The cruising function layer receives a cruising switch signal flow and cruising fault detecting signals from the cruising-active adjustable speed limiting scheduling function layer, if the condition of the vehicle is abnormal, a cruising function is interrupted, and if the cruising function is not interrupted, the target cruising torque of an engine is calculated and sent to the cruising-active adjustable speed limiting scheduling function layer; a speed limiting control layer receives a speed limiting switch signal flow and vehicle speed limiting signals from the cruising-active adjustable speed limiting scheduling function layer, if the condition of the vehicle is abnormal, an active adjustable speed limiting function is interrupted, otherwise speed limiting demand torque is outputted to the cruising-active adjustable speed limiting scheduling function layer; and the virtual pedal calculating layer calculates virtual pedal openings according to the actual torque and the speed of the vehicle. By using the invention, the out-of-control acceleration of the vehicle when in cruising error is prevented.

The invention provides an integrated control system of an electric vehicle. The integrated control system comprises a motor controller, a vehicle control unit and a battery management system; the vehicle control unit comprises a signal acquisition unit, a mode judgment unit, a torque calculation unit and a signal output unit; the signal acquisition unit is used for acquiring signals from various components of the vehicle; the mode judgment unit is used for determining a current working mode according to the acquired signals; the torque calculation unit is used for calculating the torque; and the signal output unit is used for outputting a control signal to each component of the vehicle according to the current working mode. The invention also provides a corresponding control method. According to the integrated control system and method disclosed by the invention, the signals of various components are acquired by the independent vehicle control unit to determine the working mode of the vehicle and the control signals are output according to the working mode of the vehicle, and therefore various components of the vehicle are effectively integrated.

The invention relates to a transfer carrying and nursing robot. The robot is characterized by comprising a handrail, a lifting seat mechanism, a foot treadle mechanism, a turnover prevention mechanism, a robot body, guide trundles, a body support connecting rod, a body rotary connecting rod, a chest relying part, rigid support parts and encircling parts; the rear part of the robot body is internally provided with the body support connecting rod, the upper portion of the body support connecting rod is hinged to one end of the body rotary connecting rod, the body rotary connecting rod extends out of the exterior of the robot body, the other end of the body rotary connecting rod is hinged to the back face of the chest relying part, and the chest relying part, the body support connecting rod and the body rotary connecting rod jointly constitute a three-connecting-rod structure; the upper ends of the left and right sides of the chest relying part are provided with the rigid support parts symmetrically; the upper portion of the back face of the chest relying part is provided with the handrail; the middle lower parts of the left and right sides of the chest relying part are provided with the encircling parts symmetrically, and the encircling parts are in symmetric working states, and have closing and opening states in the working process.

The invention discloses an automobile near-infrared night vision system. The automobile near-infrared night vision system is characterized in that according to the nigh vision system, a main controller is connected with a camera and a video display, the main controller is used for analyzing a night vision image which is collected by the camera, and the main controller controls an automobile high beam to be turned on to achieve nigh vision supplementary lighting after the current road environment meets the turn-on condition of the high beam. According to the automobile near-infrared night vision system, the high beam can be automatically controlled to be turned on or turned off through the combination of the road environment recognition characteristic identified by the image processing technique and road safety traffic rules, the high beam is fully used to achieve the supplementary lighting of the near-infrared night vision system, and safety and comfort of night driving are improved; meanwhile, cost of the near-infrared night vision system is reduced obviously, the night vision system can be quite easily assembled on automobiles on which no near-infrared night vision system is assembled before the automobiles leave a factory, and the near-infrared night vision system is not limited by the installation position of an infrared fill light.

The invention discloses a vehicle self-adaptive virtual lane based front effective target selection system and method. The front effective target selection system and method comprises the following steps that 1, a vehicle self-adaptive virtual lane is initialized, and a lane region and a core region of the vehicle self-adaptive virtual lane are formed; 2, self-adaptive adjustment is conducted on the vehicle self-adaptive virtual lane according to vehicle motion state information and vehicle-mounted radar information; 3, the probability that a radar target is located in the vehicle lane is calculated according to the position of the radar target located in the vehicle virtual lane, and effective target selection is performed. By means of the front effective target selection method, the problem of effective target selection in the front under multiple conditions is effectively solved, effective tracking of targets in the front can be achieved, effective targets can be caught or released in time when the motions of the targets in the front are remarkably changed, such as driving in or out of the vehicle lane, and the selection performance of the targets in the front is effectively improved.

The invention provides a projection device capable of dynamically adjusting blue light. The projection device comprises a projection lens unit, a sensing unit, a processing unit and an adjusting unit;the projection lens unit is used for clearly projecting an image to a projection area to display the projected image; the sensing unit is used for sensing the adjusting condition of the projection lens unit; the processing unit is used for determining an index value of the blue light intensity according to the adjusting condition, sensed by the sensing unit, of the projection lens unit and the corresponding relation between the adjusting condition of the projection lens unit and the projected image sizes and the projection distances; and the adjusting unit adjusts the intensity of the blue light according to the index value of the blue light intensity. According to the projection device, information including the projected image size and the projection distance can be obtained by means ofstate detection on the projection lens unit, then the blue light intensity in the unit projection area is adjusted to avoid the condition that viewers are subjected to too much blue light and eyes are injures, and therefore the viewing comfort and the safety are improved.

The invention discloses a fire-fighting water-area rescue protection suit. The fire-fighting water-area rescue protection suit comprises a protection suit body which is made of a waterproof and breathable composite fabric, wherein sealing structures are arranged on the opening positions and the inner sides of the seams, thus the waterproof and breathable protection suit is formed, and the body of a wearer is enabled to be in a dry state all the time. According to the fire-fighting water-area rescue protection suit, the novel dry type design is adopted, so that the body of a fireman is in the dry state all the time during the whole water-area rescue work, and thus the safety and the comfort of the underwater work are greatly improved.

The invention discloses an automobile speed limiting method and device during backing of an electric automobile and an electric automobile. The method comprises the following steps of detecting current speed of the electric automobile and detecting the opening of an accelerating pedal of the electric automobile; obtaining an analyzed torque of the accelerating pedal as a desired torque of the electric automobile according to the opening of the accelerating pedal before the current speed of the electric automobile reaches a first target speed; when the current speed of the electric automobile is higher than the first target speed, controlling the electric automobile to enter a speed closed-loop control mode, performing proportional integral (PI) control according to a given second target speed and the current speed of the electric automobile to obtain a closed-loop control torque when the electric automobile is in the speed closed-loop control mode, and using the closed-loop control torque as a desired torque, wherein the second target speed is higher than the first target speed; and controlling a motor of the electric automobile according to the desired torque to limit the speed of the electric automobile. Through adoption of the automobile speed limiting method disclosed by the embodiment of the invention, the safety and comfort of the electric automobile are enhanced.

The invention provides an operating table for the neurosurgery department to solve the technical problems that the comfort degree of an existing operating table is low and potential safety hazards occur to a patient, and belongs to the technical field of machinery. The operating table for the neurosurgery department comprises a base, wherein a body supporting platform, a leg supporting platform, a head supporting platform and arm supporting platforms are arranged on the base. The body supporting platform comprises a first supporting plate and a second supporting plate, wherein the first supporting plate and the second supporting plate are hinged to each other, and one end portion of the first supporting plate is provided with a fixing structure which is used for enabling the body of the patient to be fixed onto the first supporting plate. The leg supporting platform comprises a third supporting plate fixedly connected with the second supporting plate, and a fourth supporting plate hinged to the third supporting plate, wherein a first transmission mechanism which controls the fourth supporting plate to swing relative to the third supporting plate is further arranged between the third supporting plate and the fourth supporting plate. A second transmission mechanism which controls a fifth supporting plate to move in the vertical direction is arranged between a fixing block and the fifth supporting plate. The operating table for the neurosurgery department has the advantages of being good in comfort, high in safety and the like.

The invention discloses a car shift level structure which comprises a shift handle and a shift connection rod. The shift connection rod comprises an upper connection rod, a lower connection rod and a fixing mechanism, wherein the lower end of the lower connection rod is connected with a shift mechanism, the upper end of the upper connection rod is connected with the shift handle, the lower end of the upper connection rod can be sleeved on the lower connection rod at positions with different heights, and the fixing mechanism is used for fixing the upper connection rod on the lower connection rod at positions with different heights. The car shift level structure enables a driver to adjust the height of the shift handle conveniently and is simple in structure.

The invention relates to an improved assisting device of a toilet bowl, and discloses a lifting assisting device of a toilet bowl.The lifting assisting device is characterized in that a U-shaped bottom plate (6) or base frame is horizontally arranged on the ground and is positioned at the front of the toilet bowl; supporting seats (5) are arranged in the middle of the front of the bottom plate (6) or base frame, a U-shaped tube (4) is serially nested in shaft holes, straight rods of the U-shaped tube (4) are rotationally connected with long supporting rods (10) in a crossed manner, the upper ends of the long supporting rods (10) are rotationally connected to the front of a toilet bowl seat (1), and the lower ends of the long supporting rods (10) are supported at the rear of the bottom plate (6) or base frame; extending ends of the straight rods of the U-shaped tube (4) are rotationally connected with the lower ends of short supporting rods (11), and the upper ends of the short supporting rods (11) are rotationally connected to the middle of the toilet bowl seat (1).The lifting assisting device has the advantages that the lifting assisting device can assist old people or persons with injured legs to stand up, sit down and then stand up again when the old people or the persons with the injured legs go to toilets, and the height and forward inclination lifting angles of the lifting assisting device can be changed; the lifting assisting device is simple in structure, low in cost and convenient to mount, is portable and is an indispensable assisting product which is adaptive to the current aging era and can improve the living quality.

The invention discloses a wearable flexible lower limb exoskeleton based on negative pressure rotation pneumatic artificial muscle. The wearable flexible lower limb exoskeleton comprises a portable control and power system and a wearable flexible assistance system; the wearable flexible lower limb exoskeleton mainly adopts the negative pressure rotation pneumatic artificial muscle as a core driving component, rotational motion is generated under the negative pressure effect, rotating bending torque is supplied, after negative pressure disappears, stretching restoring force is generated, and stretching torque is supplied. The portable control and power system processes user gait data in real time and controls gas circuit switching and gas pressure between the negative pressure rotation pneumatic artificial muscle in the wearable flexible assistance system and a negative pressure power source in real time, wherein the user gait data is collected and fed back by an inertia measuring unit,real-time pressure control is performed on a corresponding negative pressure rotating pneumatic artificial muscle driver on the wearable flexible assistance system, in the walking process, torque helping shanks to swing relative to thighs is supplied to left and right legs in real time, and the purposes of walking assistance and lower limb rehabilitation training are achieved.

The invention discloses an automatic driving control method and device and a vehicle. A sleep state of a vehicle driver is determined, and the sleep state comprises sleep or awakening; when the sleepstate of the vehicle driver is sleep, the vehicle is switched to an automatic driving mode; and according to the driving state of the vehicle, automatic driving mode switching is carried out, the automatic driving mode is a stable mode when the driving state of the vehicle is a normal state, and the automatic driving mode is an emergency mode when the driving state of the vehicle is an emergency state. According to the technical scheme provided by the embodiment of the invention, the problem that safety and comfort are not considered under the sleep state of the driver when the same set automatic driving control strategy is used when there is no driver and the driver falls asleep is solved, automatic driving control is more targeted, and the and the comfort and safety of automatic drivingare improved.

The invention discloses a piglet nursing bed feeding mechanism. The mechanism comprises a base plate and a railing surrounding the base plate. The mechanism is characterized in that pressure sensors are arranged on the four corners of the bottom of the base plate, a feeding device is arranged on one side of the base plate, the feeding device comprises a fodder box, a rotatable feeding trough and atilting motor connected to one end of the feeding trough, a fodder discharging trough is formed in the fodder box and extends above the feeding trough, a control module is arranged on the bottom of the base plate, the input end of the control module is connected with the pressure sensors, and the output end of the control module is connected with the tilting motor and the fodder box. Through cooperation of the control module with the pressure sensors, the tilting motor, the feeding trough and the fodder box, automatic and quantitative piglet feeding can be completed; through the effects of arecycling tank, a fodder collecting device, a spiral conveyor and hydraulic jacking rods, spilled fodder can be recycled and reused, and waste is avoided; through the effects of a wind feeding deviceand an ultraviolet germicidal lamp, fodder and the feeding trough are maintained clean and sanitary. The piglet nursing bed feeding mechanism has the advantages that the automation degree is high, thefeeding efficiency is high and the sanitation degree is good.

The invention discloses a front and back vehicle prompting rear-end collision prevention system based on the visible light communication technology. The front and back vehicle prompting rear-end collision prevention system comprises a light ray sensing array used for detecting vehicle distance of target vehicles and the color of a traffic light and sending detection information, a camera set used for collecting image information of a lamp indication slogan of tail lights of the front vehicle and sending the image information, an automobile tail light control module, a data processing module used for processing the information, detected through the light ray sending array, of the traffic light and the vehicle distance detected through the light ray sending array, transmitting the information and the vehicle distance to an automobile tail light control module, processing the flicker frequency of the tail lights of the front vehicle and the image information collected and sent by the camera set and conducting displaying on a man-machine operation interface, and a light indication state control circuit. The vehicle distance of the target vehicles and the color of the traffic light are detected through visible light, and by setting the slogan indicated by the tail lights of the front vehicles and recognizing the lamp indication slogan of the tail lights of the front vehicle through the camera set, driving comfort and safety are greatly improved.

The invention relates to a fumigating therapy device for traditional Chinese medicine gynecology, comprising a fumigating generating box and a therapy box. A medicine box is arranged in the fumigatinggenerating box. The upper side of the medicine box is provided with a medicine box port. A medicine box cover is arranged at the inner side of the medicine box port. The lower middle of the medicinebox cover is provided with an atomizing rod; a vapor delivery hole is arranged in the medicine box port; a first vapor delivery tube is connected to the top of the vapor delivery hole and is connectedwith a fan; the fan is connected with a second vapor delivery tube; a first enclosed chamber an a second enclosed chamber are arranged in the therapy box; heat transfer tubes are arranged in the first and second enclosed chambers; the upper portion of the first enclosed chamber is provided with a heating tube; the left ends of the heat transfer tubes are connected with the second vapor delivery tube; rollers are arranged on the right of the second enclosed chamber; a vapor delivery hose is arranged on the rollers; a support terrace is arranged on the right of the inside of the therapy box; asoft cover is arranged at the top of the support terrace. The fumigating therapy device for traditional Chinese medicine gynecology has the advantages of reasonable structure, good convenience of use,good service effect, good health caring, and good effect.

The invention relates to a wedge-shaped Geocell cement reinforced soil structure for road-bridge connection and a construction method thereof. The structure comprises cement stabilized soil (4), fillers and Geocells (3), wherein one ends of the Geocells (3) are fixed a bridge arch table back (2), the other ends of the Geocells (3) are fixed on a roadbed (5), the Geocells (3) are arranged in multi-layer way from top to bottom, the fillers and the cement stabilized soil (4) are filled between two adjacent layers of Geocells (3), the cement stabilized soil (4) is filled at one ends, closed to the bridge arch table back (2), of the Geocells (3), the length of the cement stabilized soil at the top layer is (1/2)-(3/4) of that of the Geocell at the top layer, the other parts of the Geocells (3) are filled with the fillers, and the lengths of the cement stabilized soil (4) and the Geocells (3) are gradually reduced in a layer-by-layer way so as to form a wedge shape or a frustum. The wedge-shaped Geocell cement reinforced soil structure and the method can effectively reduce a problem of bumping at a bridge-head, improve comfort and safety of traveling, simultaneously and extremely reduce maintenance cost for processing the bridge-head, and are obvious in economic benefit.

The invention relates to a metal cutting machine. The metal cutting machine comprises a base, a support arm, a cutting head, a clamping device and a spark catcher component, wherein the support arm is fixedly mounted on the base, the cutting head is pivotally connected with the support arm, the clamping device is mounted on the base and comprises a first clamping part close to the support arm and a second clamping part distant from the support arm, and the spark catcher component comprises a first side wall. The first side wall extends backwards from the first clamping part along the direction basically parallel to the plane where a blade is located, the second side wall is opposite to the first side wall, and a gap is formed between the first and second side walls. During cutting, at least a part of blade enters the gap, and the third side wall is connected with the rear end of at least one of the first side wall and the second side wall, so that the rear of the spark catcher component is closed, and the front and the upper of the spark catcher component are at least partially opened. By the spark catcher component of the metal cutting machine, sparks generated during cutting are effectively controlled and splashing of the sparks is avoided.

An improved walker includes an adjustable frame with angled portions that provide an ergonomic interface and enhanced stability for a user. The front of the walker includes a wishbone front support frame. Rather than incorporating multiple front legs extending from the top of the walker to the floor, the wishbone front support frame provides clearance on either side of a center front column. This clearance allows users to position, or maneuver, the walker close to adjacent objects. The handrail portions of the walker are pitched at a downward angle running in a direction from the rear to the front of the walker. This pitch moves the operating position of the user close to the front of walker providing a safe and stable operating position.

The invention relates to the field of testing machines, in particular to a suspension spring torsional moment testing machine, which includes a working table. A Z-direction loading device and an X-direction loading device are mounted on the working table. The Z-direction loading device comprises a Z-direction drive device, a Z-direction transmission mechanism, a Z-direction guide rail, a Z-direction moving member, a Z-direction displacement measurement device and the like. The X-direction loading device comprises an X-direction drive device, an X-direction transmission mechanism, an X-direction guide rail, an X-direction moving member, an X-direction displacement measurement device, a Y-direction guide rail, a Y-direction moving member and the like. A fixed shaft is disposed on the working table. The fixed shaft is mounted vertically in a movable manner on the working table. The invention further provides a suspension spring torsional moment testing method. The invention can be used for simulating an actual use state of a suspension spring, testing the torsional moment of the suspension spring, thus enabling the torsional moment of the suspension spring to stay in a standard range, and improving the comfort and safety of a vehicle.

An engine hydraulic suspension limiting structure comprises a driving side support, a rubber main spring, a limiting structure body, a disturbed flow disc, a flow channel cover, a decoupling membrane, an aluminum flow channel and a driven side support. The lower end of the driving side support extends into the driven side support of a hydraulic suspension and is fixedly riveted with the disturbed flow disc. The limiting structure is arranged in the driven side support, the upper end of the limiting structure sleeves the outer portion of the lower end of the driving side support and presses the disturbed flow disc, and the lower end of the limiting structure is riveted to the flow channel cover and the aluminum flow channel to be fixed with the driven side support of the hydraulic suspension. The decoupling membrane is installed between the flow channel cover and the aluminum flow channel. Movement of a power assembly is transmitted to the disturbed flow disc through the driving side support, the limiting structure and the flow channel cover can effectively control movement of the disturbed flow disc so as to achieve the goal of effectively controlling movement of the power assembly, and comfort and safety of a whole vehicle are improved.

The invention discloses a headrest assembly and a child safety seat. The headrest assembly comprises a middle back plate and side protective wings located on the two sides of the middle back plate. The side protective wings are coupled to the side parts of the back plate so that the side protective wings can rotate relative to the back plate in an amplitude limiting manner; a first limiting structure is arranged between the side protective wings and the back plate to limit the maximum angle between the side protective wings and the back plate, a second limiting structure is arranged between the side protective wings and the back plate to limit the minimum angle between the side protective wings and the back plate, and therefore the child safety seat is suitable for children of different body types taking the child safety seat. Children sitting on the child safety seat with the design can obtain head support of different angles and different degrees by adjusting the angles of the side protective wings, and the sitting comfort and safety are improved.

The invention discloses a rail car controllable acceleration braking device, a rail car provided with the rail car controllable acceleration braking device, and a rail car controllable acceleration braking method. The controllable acceleration braking device of the rail car comprises a braking execution component, a force application control component, a power loss reset component, a control action unit, a braking transmission mechanism and an elastic connecting component. The braking action unit outputs linear displacement through the elastic connecting component, the power loss reset component continuously applies a braking control force to the braking execution component, the linear displacement provided by the force application part can balance the braking control force, and the braking execution component provides a linear braking force for the rail car under the action of a resultant force. The braking force provided by the braking execution component is controllable and can be linearly output, so that stable braking of the vehicle is achieved, the running stability of the vehicle is improved, and the purposes of improving the riding safety and comfort of the vehicle are achieved.

The invention discloses a flexible monorail turnout with a high switch crossing speed, and belongs to the technical field of monorail turnouts. A positive wire rail beam, a positive fixed end and a lateral fixed end are arranged in a monorail line, a flexible beam body is arranged between the positive wire rail beam and the fixed end to communicate the positive wire rail beam with the fixed end, afixing device and a damping support device are arranged on the flexible beam body to effectively realize accurate connection and stable support of the flexible beam body, a guided vehicle, a guide rail and a driving device are matched to guide the flexible beam body in bending and abutting joint, and further smooth crossover of a train at the monorail turnout is realized. According to the flexible monorail turnout, smoothness of the turnout beam is effectively improved, interference and impact of the monorail train during beam replacement in a turnout zone are decreased, crossover comfort andsafety of the monorail train are greatly improved, the crossover speed and the efficiency of the monorail train are effectively increased, the crossover cost of the monorail train is reduced, and application of monorail transportation is promoted.

The invention discloses a riding pad. The riding pad comprises a cotton non-woven fabric surface layer, fluff pulp disposed at a lower layer of the cotton non-woven fabric surface layer, a polymer water-absorbing layer disposed at a lower layer of the fluff pulp, a breathable and leak-proof bottom film disposed at a lower layer of the polymer water-absorbing layer and an environment-friendly backing adhesive disposed at a lower layer of the breathable and leak-proof bottom film, and anti-movement lock catches are arranged on both sides of the environment-friendly backing adhesive, wherein theanti-movement lock catches each include two fixing straps to further strengthen the riding pad and underwear to ensure a tight fit. The riding pad is specially designed for long-distance riding enthusiasts, is suitable for people of various heights and weights, is unisex, avoids the embarrassment caused by traditional alternatives, and is not prone to being deformed and shifted during use, and comfort of riding experience is greatly enhanced.

The invention discloses a child scooter with a damping function. The child scooter comprises a handlebar assembly, a stand column, a front wheel, a connecting shaft, a rear wheel and a base, wherein the base is of a double-layer structure including an upper-layer base and a lower-layer base, a plurality of damping buffering pieces distributed at equal intervals and at least two supporting buffering pieces are installed between the upper-layer base and the lower-layer base, and each damping buffering piece comprises an upper fixing column, at least four lower fixing columns and tension springsequal to the number of the lower fixing columns; and the supporting buffering pieces are rubber columns with compression springs arranged on the outer peripheries in a sleeving mode. According to thechild scooter, through the design of the novel buffer damping structure, the vibration force is reduced, the base of the scooter can absorb bumps in a driving process, and the driving safety and comfort are improved.

The invention provides an adjustable head support. The adjustable head support comprises a head support frame, side support frames and a connecting rod, wherein the head support frame is fixed on theconnecting rod, the side support frames are respectively mounted on two sides of the head support frame and are movably connected with the head support frame through fastening components and spring pieces, and anti-loosening parts for preventing the loosening of the side support frames are arranged between the fastening components and spring pieces. According to the adjustable head support, the side support frames are movably connected with the head support frame through the fastening components and the spring pieces, the angles between the side support frames and the head support frame can beautomatically adjusted according to the requirements of a user, so that the head of the user can be in a personalized and comfortable angle; and after the adjustment is finished, the rotation of theside support frames caused by loosening can be prevented by virtue of the anti-loosening parts, so that the comfort and the safety are improved.