CN112339837A

CN112339837A - Double-seat multifunctional baby carriage

Info

Publication number: CN112339837A
Application number: CN202011284727.9A
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-17
Filing date: 2020-11-17
Publication date: 2021-02-09

Abstract

The invention discloses a double-seat multifunctional baby carriage, which comprises two seats, a frame mechanism, a chassis mechanism and an armrest frame, wherein the seats can provide a comfortable sitting and lying space for infants, a flat plane can be formed inside the seats to facilitate the infants to lie and play, the inclination angle of a seat backrest can be adjusted according to the preference of the infants, the upper end of the frame mechanism and the rear end of the seats can be connected and separated through a modularized quick insertion structure, the frame mechanism adopts a multi-connecting-rod structure to conveniently realize the height and direction adjustment of the seats, and simultaneously realize the transverse cradle function of the seats according to the pendulum effect, the lower end of the frame mechanism is fixedly connected with the chassis mechanism, the lower end of the armrest frame is fixedly connected with the chassis mechanism, four wheels arranged below the chassis mechanism are independently suspended to improve the damping performance and the passing performance of the chassis mechanism and provide a more comfortable sitting environment for the infants, and the parents can control the baby carriage more easily through the armrest frame.

Description

Double-seat multifunctional baby carriage

Technical Field

The invention relates to the field of strollers, in particular to a double-seat multifunctional baby stroller.

Background

The baby carriage is a walking tool for babies, and the space in the baby carriage body can be used for the babies to sit, lie and the like, so that the baby carriage greatly facilitates the traveling activities of parents carrying the babies, and provides comfortable sitting and growing space for the babies; when the baby is small, the baby still needs to lie down when going out, and the baby carriage with the soft shock absorption and the high carriage style is more convenient for parents to take care of the baby; when the infant is large, the infant can eat some coarse cereals, a high dining chair is usually used for feeding the infant conveniently, a safety vehicle for assisting the infant to walk is needed in the learning and walking stage of the infant, the activity amount is large at the moment, and therefore the infant vehicle with a lower gravity center is needed to be used for preventing the infant vehicle from overturning or falling down to cause large damage; in the process of using the baby carriage, some babies face parents to have a sense of safety, and other babies face forwards to facilitate observation of fresh things along the way, so that the baby carriage is required to have a function of adjusting the direction of the seat; the existing baby carriage has single function, and generally becomes an idle product due to the fact that the service life of the baby carriage can not meet the growth requirements of infants about one year; moreover, most of the existing baby carriages do not have the function of a cradle, and parents can only hold the baby to shake when the baby cries due to the emotions of fussy or boring, so that the crying of the baby can be stopped, which can increase the physical burden of the parents and the inconvenience in movement.

For satisfying the different demands of each growth stage of infant, especially twins infant's growth demand, purchase a plurality of perambulator and supplementary chair can lead to the family to purchase the expense increase, causes the waste of resource, also occupies more indoor parking space, along with life style's change, the consumer also appears diversified demand to the perambulator, and the product of function singleness can not satisfy people to the diversified demand of perambulator.

The invention patent with publication number CN102616263A discloses a cradle type multifunctional baby carriage, wherein the lower end of the basket body is provided with a basket body seat, the upper side of the basket plate is provided with a basket body groove, and the basket body seat can rotate in the basket body groove, so as to realize the cradle function of the longitudinal swing of the basket body; in addition, because the cradle swings longitudinally, the infant can have a head-foot high state when using the cradle, and the infant can show different degrees of tension or fear in the state, which can generate adverse effects on the fragile psychology of the infant.

Disclosure of Invention

In order to solve the defects of the prior art, the invention aims to provide a double-seat multifunctional baby carriage which is novel in structure, rich in functions and convenient to operate.

The technical scheme adopted by the invention is as follows: two multi-functional perambulator, including first seat, second seat, frame mechanism, chassis mechanism, handrail frame, its characterized in that: the first seat and the second seat have the same structure, the first seat and the second seat can adjust the pitching inclination angle and provide a comfortable sitting and lying space for infants, a flat plane can be formed inside the first seat and the second seat to facilitate the infants to lie and play, the inclination angle of the seat backrest can be adjusted according to the preference of the infants, the upper end of the frame mechanism can be connected with and separated from the rear ends of the first seat and the second seat through a modularized fast-inserting structure, the frame mechanism adopts a multi-link structure, the height and direction adjustment of the first seat and the second seat can be conveniently realized, the frame mechanism has great flexibility and convenience, meanwhile, the transverse cradle function of the first seat and the second seat can also be realized according to the pendulum effect, the lower end of the frame mechanism is fixedly connected with the chassis mechanism, the lower end of the armrest frame is fixedly connected with the chassis mechanism, and four wheels arranged under the chassis mechanism are independently suspended, the baby carriage has the advantages that the damping performance and the passing performance of the chassis mechanism are improved, a more comfortable riding environment is provided for infants, and parents can control the baby carriage more easily through the armrest frame.

Preferably, the first seat comprises a frame, a rear turning plate, a pressing plate, a front turning plate, a first insert rod, a first spring, a first connecting rod, a second spring, a second insert rod, a first positioning cover, a first knob, a second positioning cover, a third insert rod, a third spring, a third connecting rod, a fourth spring, a fourth insert rod, a spring leaf, a pressing plate hook, a button, a hook, a slot frame, a wedge block, a nut, an ejector rod, a hook spring and a set screw, the frame is a main body supporting structure of the first seat, a seat plate and a transverse armrest are arranged at the front end of the frame, a rotating pair is formed by the front turning plate and the seat plate, and the inclination angle of the front turning plate is locked by a positioning mechanism formed by the first insert rod, the first spring, the first connecting rod, the second spring, the second insert rod and the first knob so as to provide a comfortable leaning backrest for infants, the first positioning cover covers the outer side of the positioning mechanism, the rear turning plate and the front turning plate form a revolute pair, the locking of the rear turning plate relative to the front turning plate is realized through a locking mechanism consisting of a pressing plate, a pressing plate hook and a spring piece, the positioning mechanism consisting of a second knob, a third inserted link, a third spring, a third connecting link, a fourth spring and a fourth inserted link can be used when the front turning plate is in a horizontal state, the inclination angle of the rear turning plate is locked, the second positioning cover covers the outer side of the positioning mechanism, the slot frame and the frame form a revolute pair, the lower end of the slot frame adjusts the pitching inclination angle of the first seat through an adjusting mechanism formed by a wedge block, a nut and an ejector rod, so that first seat can bring comfortable taking experience for the infant of different hobbies, the high-efficient and quick connection and the separation of first seat and frame mechanism can be realized to the modularization that constitutes by slot frame, button, couple spring, holding screw, couple and insert the structure soon.

Preferably, six pairs of front positioning holes are formed in two sides of the middle of the frame, five pairs of rear positioning holes are formed in two sides of the rear end of the frame, the six pairs of front positioning holes are distributed in an equidistant arc mode, the seat plate is arranged at the front end of the frame, a revolute pair is formed by the lower end of the front turning plate and the rear end of the seat plate, a front plate upright post, a front plate left socket and a front plate right socket are arranged on the rear side of the front turning plate, two shifting posts are arranged on the upper side and the lower side of the front end of the first knob and form a revolute pair with the front plate upright post, a first insertion rod is installed in the front plate left socket and forms a revolute pair with the front plate upright post, a first spring is installed between the first insertion rod and the front plate left socket, the first insertion rod is always located at the left end position of the front plate left socket under the action of the elastic force of the first spring; the second inserted bar is installed in the front plate right socket and constitutes the sliding pair, the second spring is installed between the second inserted bar and the front plate right socket, under the action of the second spring elasticity, the second inserted bar is always located at the right end position of the front plate right socket, and the second connecting rod is installed between the left end of the second inserted bar and the lower side shifting column at the front end of the first knob and constitutes the sliding pair with the rear two.

When the front turning plate is in a natural state, the first inserting rod and the second inserting rod are respectively inserted into a pair of front positioning holes at two sides of the frame under the action of elastic force of the first spring and the second spring, when the inclination angle of the front turning plate needs to be adjusted, the first knob is clockwise twisted, the first inserting rod moves rightwards and the second inserting rod moves leftwards under the action of tension of the first connecting rod and the second connecting rod, after the first inserting rod and the second inserting rod are separated from the front positioning holes, the front turning plate can be adjusted to a proper inclination position, the twist of the first knob is released, the first inserting rod and the second inserting rod are inserted into the front positioning holes at new positions, and the inclination angle adjusting action of the front turning plate can be completed; when the first inserted link and the second inserted link are inserted into the pair of front positioning holes at the lowest end, the front turning plate and the seat plate form a plane.

Preferably, the lower end of the rear turning plate and the upper end of the front turning plate form a revolute pair, the two pressure plate hooks are arranged at the upper end of the front turning plate and form the revolute pair, the spring leaf is arranged between the lower end of the pressure plate hook and the front turning plate, the two pressure plates are fixedly arranged at the lower end of the rear turning plate through screws, the rear turning plate rotates anticlockwise relative to the front turning plate until the rear turning plate and the front turning plate form a plane, the two pressure plates can be clamped into the two pressure plate hooks, and the pressure plate hooks press the pressure plates under the action of the elasticity of the spring leaf, so that; the lower ends of the two pressure plate hooks are pressed to rotate anticlockwise, and after the pressure plates are separated from the pressure plate hooks, the rotation of the rear turning plate relative to the front turning plate can be restored.

Preferably, a rear plate upright post, a rear plate right socket and a rear plate left socket are arranged on the rear side of the rear turning plate, two shifting posts are arranged on the upper side and the lower side of the front end of the second knob and form a revolute pair with the rear plate upright post, a third insertion rod is installed in the rear plate right socket and form a revolute pair, a third spring is installed between the third insertion rod and the rear plate right socket, the third insertion rod is always positioned at the right end position of the rear plate right socket under the action of the elastic force of the third spring, and a third connecting rod is installed between the left end of the third insertion rod and the shifting posts on the lower side of the front end of the second knob and forms a revolute pair with the rear two insertion rods; the fourth inserted bar is installed in the left socket of the rear plate and forms a sliding pair, the fourth spring is installed between the fourth inserted bar and the left socket of the rear plate, the fourth inserted bar is always positioned at the left end position of the left socket of the rear plate under the action of the elastic force of the fourth spring, and the fourth connecting rod is installed between the right end of the fourth inserted bar and the shifting column on the upper side of the front end of the second knob and forms a sliding pair with the rear inserting bar and the shifting column.

Preferably, after the front turning plate and the seat plate form a plane, in a natural state, a third insertion rod and a fourth insertion rod are respectively inserted into a pair of rear positioning holes under the elastic force action of a third spring and a fourth spring, when the inclination angle of the rear turning plate needs to be adjusted, a second knob is twisted clockwise, under the tension action of a third connecting rod and a fourth connecting rod, the third insertion rod moves leftwards, the fourth insertion rod moves rightwards, after the third insertion rod and the fourth insertion rod are separated from the rear positioning holes, the rear turning plate can be adjusted to a proper inclination position, the twisting of the second knob is released, the third insertion rod and the fourth insertion rod are inserted into the rear positioning holes at new positions, and the inclination angle adjustment action of the rear turning plate can be completed; when the third inserted link and the fourth inserted link are inserted into the pair of rear positioning holes at the lowest end, the rear turning plate, the front turning plate and the seat plate can form a plane for the infant to have a rest in a lying mode.

Preferably, the rear side of the frame is provided with a connecting seat and a top rod seat, the upper end of the left side of the slot frame and the connecting seat form a revolute pair, the upper end of the right side of the slot frame is provided with a rectangular groove, the upper end of the rectangular groove is provided with two rectangular insertion holes, the lower end of the slot frame is internally provided with a hook cavity and a transverse button hole, the hook is arranged in the hook cavity, the hook can slide up and down in the hook cavity, the upper end of the hook is provided with an inclined plane structure, the middle position of the hook is provided with a rectangular opening, the lower side of the button is provided with an inclined plane, the button penetrates through the rectangular opening in the middle of the hook and is installed in the button hole of the slot frame, the lower end of the slot frame is provided with two threaded holes communicated with the hook cavity, the two set screws are installed in the two threaded holes respectively, the two hook springs are arranged between the two set screws and the hook respectively, the left end of the ejector rod and the ejector rod seat form a revolute pair, and the threaded structure of the right end, the two wedge blocks.

In an initial state, under the action of the elastic force of a hook spring, the hook is positioned at the upper end of the hook cavity, the inclined plane structure at the upper end of the hook extends into the rectangular groove at the upper end of the right side of the slot frame, and the inclined plane at the lower side of the button is pressed leftwards to push the hook to move downwards so that the inclined plane structure at the upper end of the hook retracts into the hook cavity; after the press of the button is released, the hook returns to the initial position under the action of the elastic force of the hook spring.

The set screw and the slot framework are connected in a thread pair mode, the compression amount of the hook spring can be changed by adjusting the position of the set screw, and therefore the button pressing and resilience force can be adjusted.

The adjustment of the pitch angle of the first seat can be realized by adjusting the positions of the two nuts on the mandril: when the two nuts move leftwards on the ejector rod, the front end of the first seat inclines downwards, and when the two nuts move rightwards on the ejector rod, the front end of the first seat inclines upwards.

Preferably, the frame mechanism comprises a first swing rod, a top cover, a first upright post, a first sliding sleeve, a first spring, a second upright post, a pneumatic rod switch, a lower connecting rod, an upper connecting rod, a pneumatic rod, a fixed upright post, a second spring, a second sliding sleeve, a third upright post, a locking wrench, a cradle inserting rod, an inserting rod spring, a top swinging sleeve, a tail swinging sleeve, a second swing rod and a transverse connecting rod, the frame mechanism can be connected with the first seat in a modularized manner through the first swing rod, is connected with the second seat in a modularized manner through the second swing rod, enables the first seat and the second seat to realize a synchronous transverse cradle function based on a pendulum effect through the transverse connecting rod, the first upright post is of a T-shaped structure, the locking wrench positioned at the left side position of the upper end of the first upright post can realize the locking of the cradle function of the first seat through the cradle inserting rod, the first upright post can rotate relative to the second upright post and is locked at the rotation position of the first sliding sleeve, the lower connecting rod and the upper connecting rod are arranged between the second upright post and the third upright post, the upper connecting rod and the lower connecting rod form a parallelogram structure, the air pressure rod is arranged between the lower connecting rod and the upper connecting rod through the top swing sleeve and the tail swing sleeve and used for adjusting the height of the second upright post, the lower end of the fixed upright post is fixedly connected with the chassis mechanism, the third upright post can rotate relative to the fixed upright post, and the rotating position is locked by the second sliding sleeve.

Preferably, the first swing link and the second swing link are identical in structure, the left end of the first swing link is a rectangular plate structure with the same size as the rectangular groove at the upper end of the right side of the slot frame, two inserting plates are arranged at the upper end of the rectangular plate structure, the right end of the first swing link is a circular shaft structure, a circular hole is vertically arranged at the upper side of the circular shaft structure, the circular shaft structure and the left end of the upper side of the first upright post form a rotating pair through a bearing, the circular shaft structure at the right end of the second swing link and the right end of the upper side of the first upright post form a rotating pair through a bearing, the left end of the transverse connecting rod and the first swing link form a rotating pair, the right end and the second swing link form a rotating pair, the first swing link, the second swing link, the first upright post and the transverse connecting rod form a parallelogram structure, a stepped circular hole is vertically arranged at the left end of the upper side, the lower end of the locking wrench and the upper end of the cradle inserted bar form a revolute pair, and the top cover is arranged at the left end of the upper side of the first upright post.

Preferably, the rectangular plate structure at the left end of the first swing rod can be embedded into the rectangular groove of the slot frame, the two inserting plates at the upper end of the rectangular plate structure are inserted into the two rectangular inserting holes at the upper end of the rectangular groove of the slot frame, and the hook can hook the lower edge of the rectangular plate structure, so that the modular connection of the first seat and the frame mechanism is realized; the hook can be retracted inwards by pressing the button, so that the connection between the first seat and the frame mechanism can be released; the modular connection principle of the second seat and the frame mechanism through the second swing rod is the same as that described above.

When the cradle is in the initial state, the locking wrench is in the vertical state, the cradle inserted bar is downwards inserted into the round hole on the upper side of the round shaft structure at the right end of the first swing bar under the action of the spring force of the inserted bar spring, so that the cradle function of the first seat and the second seat is locked, and after the locking wrench is pulled backwards to the horizontal state, the cradle inserted bar upwards moves and is separated from and kept in the round hole on the upper side of the round shaft structure at the right end of the first swing bar, so that the cradle function of the first seat and the second seat can be recovered.

Preferably, the lower end of the first upright post is provided with an external spline, the upper end of the second upright post and the lower end of the first upright post form a revolute pair through two deep groove ball bearings and a thrust ball bearing, the position of the second upright post, which is close to the upper end, is provided with the external spline, the upper end and the lower end inside the first sliding sleeve are both provided with the internal spline, the internal spline at the lower end of the first sliding sleeve and the external spline on the second upright post form a sliding pair, so that the first sliding sleeve can slide on the second upright post and cannot rotate, the internal spline at the upper end inside the first sliding sleeve can be matched with the external spline at the lower end of the first upright post, and a first.

In an initial state, the internal spline at the upper end of the first sliding sleeve is always matched with the external spline at the lower end of the first upright post under the action of the elastic force of the first spring, so that the rotation of the first upright post relative to the second upright post is locked; when the first upright post needs to be rotated, the first sliding sleeve can be pressed downwards, so that the inner spline at the upper end of the first sliding sleeve is separated from the matching with the outer spline at the lower end of the first upright post, the first upright post can be rotated to a proper angle, then the pressing of the first sliding sleeve is released, the inner spline at the upper end of the first sliding sleeve is matched with the outer spline at the lower end of the first upright post, and the position of the first upright post is locked.

Preferably, the lower end of the third upright post is provided with an external spline, the upper end of the fixed upright post and the lower end of the third upright post form a revolute pair through two deep groove ball bearings and a thrust ball bearing, the fixed upright post is provided with an external spline near the upper end, the upper end and the lower end inside the second sliding sleeve are both provided with internal splines, the internal splines at the lower end of the second sliding sleeve and the external splines on the fixed upright post form a revolute pair in a matching manner, so that the second sliding sleeve can slide on the fixed upright post and cannot rotate, the internal splines at the upper end inside the second sliding sleeve can be matched with the external splines at the lower end of the third upright post, and a.

In an initial state, the internal spline at the upper end of the second sliding sleeve is always matched with the external spline at the lower end of the third upright post under the action of the elastic force of the second spring, so that the rotation of the third upright post relative to the fixed upright post is locked; when the third upright post needs to be rotated, the second sliding sleeve can be pressed downwards, so that the inner spline at the upper end of the second sliding sleeve is separated from the matching with the outer spline at the lower end of the third upright post, the third upright post can be rotated to a proper angle, then the pressing on the second sliding sleeve is released, the inner spline at the upper end of the second sliding sleeve is matched with the outer spline at the lower end of the third upright post, and the position of the third upright post is locked.

After the second sliding sleeve is pressed downwards and the third upright post is rotated by 180 degrees, the pressing of the second sliding sleeve is released, so that the position of the third upright post is locked, the first seat and the second seat can be changed from forward to backward, and the state of facing parents of the infant can be changed from back to back by facing the parents.

Preferably, the left ends of the upper connecting rod and the lower connecting rod form a revolute pair with the third upright, the right ends of the upper connecting rod and the lower connecting rod form a revolute pair with the second upright, the upper connecting rod is mounted on the upper side of the lower connecting rod, the upper connecting rod, the lower connecting rod, the second upright and the third upright form a parallelogram structure, the upper end of the pneumatic rod forms a revolute pair with the upper connecting rod through the top swing sleeve, the lower end of the pneumatic rod forms a revolute pair with the lower connecting rod through the tail swing sleeve, and the pneumatic rod switch is mounted at the top end position of the pneumatic rod and forms a.

When the first seat and the second seat are in an idle state, the air pressure rod switch is turned downwards to enable the air pressure rod to extend, so that the position of the second upright post is raised, and the first seat and the second seat are raised; when the switch of the air pressure rod is turned downwards, the first upright post is pressed downwards, the air pressure rod can be contracted, the first seat and the second seat are lowered, the length of the air pressure rod can be locked by loosening the switch of the air pressure rod, and the height positions of the first seat and the second seat are locked.

Preferably, the chassis mechanism comprises a bottom plate, a first elastic rod, a first upper connecting rod, a first lower connecting rod, a left rear leg rod, a left rear wheel, a right rear leg rod, a second lower connecting rod, a second upper connecting rod, a second elastic rod, a third upper connecting rod, a third lower connecting rod, a right front leg rod, a right front wheel, a fourth elastic rod, a fourth upper connecting rod, a fourth lower connecting rod, a left front leg rod, a left front wheel and a brake mechanism, wherein the bottom plate is a supporting body of the chassis mechanism, the left front wheel is in a universal wheel structure and is independently suspended through the left front leg rod, the fourth lower connecting rod, the fourth upper connecting rod and the fourth elastic rod, the right front wheel is in a universal wheel structure and is independently suspended through the right front leg rod, the third lower connecting rod, the third elastic rod, the left rear wheel is provided with the brake mechanism and is independently suspended through the left rear leg rod, the first lower connecting rod, the first upper connecting rod and the first elastic rod, the right rear wheel is provided with a brake mechanism and is independently suspended through the right rear leg rod, the second lower connecting rod, the second upper connecting rod and the second elastic rod, the four wheels are independently suspended, the damping performance and the passing performance of the chassis mechanism are improved, a more comfortable riding environment is provided for infants, and parents can easily realize the control of the baby carriage.

Preferably, the front end of the left front leg rod and the upper end of the left front wheel form a revolute pair, the rear end of the left front leg rod and the left side of the front end of the bottom plate form a revolute pair, the rear end of the fourth upper connecting rod and the left side of the front end of the bottom plate form a revolute pair, the upper end of the fourth lower connecting rod and the front end of the fourth upper connecting rod form a revolute pair, the lower end of the fourth lower connecting rod and the left front leg rod form a revolute pair, the fourth elastic rod is internally provided with a spring, the rear end of the fourth elastic rod and the upper side of the bottom plate form; the front end of the right front leg rod and the upper end of the right front wheel form a revolute pair, the rear end of the right front leg rod and the right side of the front end of the bottom plate form a revolute pair, the rear end of the third upper connecting rod and the right side of the front end of the bottom plate form a revolute pair, the upper end of the third lower connecting rod and the front end of the third upper connecting rod form a revolute pair, the lower end of the third lower connecting rod and the front end of the right front leg rod form a revolute pair, the third elastic rod is internally provided with a spring, the rear end of the third elastic rod and the upper.

Preferably, the front end of the left rear leg rod and the left side of the rear end of the bottom plate form a revolute pair, the upper side of the rear end of the left rear leg rod is provided with a brake frame, the lower side of the rear end of the left rear leg rod and a left rear wheel form a revolute pair, the right side of the left rear wheel is provided with a left brake disc, eighteen insertion holes are uniformly formed in the circumferential direction of the left brake disc, the brake mechanism can lock the left brake disc so as to lock the rotation of the left rear wheel, the front end of the first upper connecting rod and the left side of the rear end of the bottom plate form a revolute pair, the upper end of the first lower connecting rod and the rear end of the first upper connecting rod form a revolute pair, the front end of the first elastic rod and the upper side of the bottom plate form a revolute pair; the front end of the right rear leg rod and the right side of the rear end of the bottom plate form a revolute pair, the upper side of the rear end of the right rear leg rod is provided with a brake frame, the lower side of the brake frame is provided with a set of brake mechanisms, the lower side of the rear end of the right rear leg rod and the right rear wheel form a revolute pair, the left side of the right rear wheel is provided with a right brake disc, eighteen insertion holes are uniformly formed in the circumferential direction of the right brake disc, the brake mechanisms can lock the right brake disc so as to lock the rotation of the right rear wheel, the front end of the second upper connecting rod and the right side of the rear end of the bottom plate form a revolute pair, the upper end of the second lower connecting rod and the rear end of the second upper connecting rod form a revolute pair, the front end of the second elastic rod.

Preferably, the brake mechanism comprises a brake releasing plate, a brake inserting rod, a brake spring, a sliding shaft spring, a brake shaft sleeve, a brake lower connecting rod, a brake upper connecting rod and a rotating shaft, the upper end of the brake shaft sleeve is fixedly connected with the brake frame, the sliding shaft is coaxially arranged in the brake shaft sleeve and forms a sliding pair, the sliding shaft spring is arranged between the brake inserting rod and the sliding shaft sleeve, the brake inserting rod is coaxially arranged at the lower end of the sliding shaft and forms a sliding pair, the brake spring is arranged between the brake inserting rod and the sliding shaft sleeve, the left end of the brake releasing plate is of a pedal structure, the upper side of the right end of the brake releasing plate and the brake shaft sleeve form a rotating pair, the lower side, the upper end of the brake upper connecting rod and the lower side of the brake frame form a rotating pair, and the lower end of the brake upper connecting rod, the right end of the brake lower connecting rod and the right end of the brake plate form a coaxial rotating pair through a rotating shaft.

When the brake mechanism is in an initial state, the brake mechanism is in a release state, the sliding shaft is located at the uppermost end position inside the brake shaft sleeve under the action of the elastic force of the sliding shaft spring, the brake inserted bar is located at the lowermost end position of the sliding shaft under the action of the elastic force of the brake spring, the brake inserted bar is not in contact with the left brake disc, the left end of the brake plate is located at the upper position at the moment, and the left end of the brake releasing plate is located at the lower position.

When the left rear wheel needs to be braked, the left end of the brake plate is stepped downwards, the sliding shaft moves downwards until the rotating shaft contacts and butts against the outer side face of the brake shaft sleeve, the brake inserted rod is inserted into the insertion hole in the left brake disc in the process, the left end of the brake plate is loosened to move to the upper position, and the brake process of the left rear wheel is completed by loosening the brake plate at the lower position.

When the brake of the left rear wheel needs to be released, the left end of the brake releasing plate is stepped downwards, the rotating shaft is pushed away from the brake shaft sleeve through the brake lower connecting rod, the sliding shaft is pushed to the uppermost end position under the action of the elastic force of the sliding shaft spring, then the brake inserting rod is pulled away from the insertion hole of the left brake disc, the brake plate moves from the low position to the high position, the brake releasing plate moves to the low position, and the action of releasing the brake of the left rear wheel is completed.

Preferably, the braking and braking release principles of the right rear wheel are the same as those of the left rear wheel.

The invention has the beneficial effects that:

one baby carriage can meet the requirement of twins or two babies with small age difference for going out simultaneously, compared with two common baby carriages, the baby carriage has the advantages of reduced purchasing cost, saved storage space, capability of completing the care of two babies by one parent and convenient use.

The heights of the two seats can be adjusted according to the requirements of infants, and when a small infant is born, the positions of the seats can be properly adjusted to be high, so that parents can conveniently look after the seats; when the infant is bigger, the seat can be properly lowered, the overall gravity center is lowered, and the riding safety is improved.

And thirdly, the height of the seat is adjusted by adopting a pneumatic rod structure, so that the operation is convenient, the pneumatic rod has a certain damping and buffering effect, and the riding comfort of the seat is improved.

The inclination angles of the backrest of the two seats can be adjusted according to needs, so that infants with different body types can keep comfortable sitting postures, the inclination angle of the front turning plate can be adjusted only by twisting the first knob, and the operation is convenient.

The rear turnover plate can be locked to form a leveling surface with the front turnover plate, so that the infant can lean against the seat plate conveniently, the seat plate and the front turnover plate can form a leveling surface, the infant can lie conveniently, the inclination angle of the rear turnover plate can be independently adjusted, and the infant can support the head when lying conveniently.

The two seats can change directions, the infant can have a wide visual field when the seat faces forwards, and the infant can face the parents when the seat faces backwards, so that the feeling of safety of the infant is increased, and the parents can conveniently communicate and interact with the infant.

The two seats have the function of a cradle, can realize transverse swinging according to the pendulum effect, cannot generate sudden descending danger in the swinging process of the seats, cannot generate a head-low and foot-high state to make infants generate uneasiness and tension, can effectively prevent the infants from crying and screaming caused by dysphoria or chatting and the like, and relieves the burden of parents.

The swing of the swing rod can be locked and unlocked by pulling the locking wrench, so that the cradle swing function of the two seats can be locked or unlocked, the cradle function can be locked when the baby carriage is moved, the safety is improved, the cradle function can be unlocked when the baby cry and scream, and the operation is quick and convenient.

Ninthly, the two seats and the frame can be connected quickly and stably through the modularized connecting mechanism, so that the assembly efficiency is improved, other seats adopting the same connecting module can be replaced quickly and conveniently according to actual needs, and the interchangeability of the baby carriage is improved.

The pitching inclination angles of the two seats at the R (R) can be adjusted according to the preference of the infant, so that the comfort of the seat in riding is improved.

The first upright post can be locked by the first sliding sleeve relative to the rotation of the second upright post, the third upright post can be locked by the second sliding sleeve relative to the rotation of the fixed upright post, the locking structure is convenient to operate, simple and reliable, the minimum unit of the rotation angle can be changed by changing the number of the spline teeth, namely, the first upright post and the third upright post can be locked after rotating any angle under the condition that the number of the spline teeth is enough.

The four wheels are of independent suspension structures, the damping performance and the passing performance of the chassis mechanism are improved, a more comfortable riding environment is provided for infants, and parents can easily control the baby carriage.

Two rear wheels all are provided with brake mechanism, and brake mechanism does not adopt the friction locking principle, but adopts the mechanical type locking structure that splines of inserted bar jack, and the not hard up condition can not appear frequently or long-time the use, also can not receive the influence of greasy dirt dust etc. and the braking effect is stable, convenience simple to use.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of two seats facing rearward.

Fig. 3 is a schematic view of the overall structure of the first seat.

Fig. 4 is a schematic view of the overall structure of the first seat.

Fig. 5 is an exploded view of the first seat.

Fig. 6 is an exploded schematic view of the frame mechanism.

Fig. 7 is a schematic view of the two seat bassinet functional locked state.

Fig. 8 is a schematic view of the two seat cradles in a functional open state.

Fig. 9 is a schematic view of the rotation-locked state of the first column.

Fig. 10 is a schematic view of the first column in a rotatable state.

Fig. 11 is a schematic view of the rotation-locked state of the third column.

Fig. 12 is a schematic view of the third column in a rotatable state.

Fig. 13 is an overall structural schematic diagram of the chassis mechanism.

Fig. 14 is an overall schematic view of the brake mechanism.

Fig. 15 is an exploded view of the braking mechanism.

FIG. 16 is a schematic view of a brake mechanism released state.

FIG. 17 is a schematic view of the brake mechanism locking the rotation of the left rear wheel.

Reference numerals: 1.1 first seat, 1.2 second seat, 101 frame, 101.1 seat, 101.2 front positioning hole, 101.3 rear positioning hole, 101.4 ejector pin seat, 101.5 connecting seat, 102 rear flap, 102.1 rear panel upright post, 102.2 pressing plate, 102.3 rear panel right socket, 102.4 rear panel left socket, 103 front flap, 103.1 front panel upright post, 103.2 front panel left socket, 103.3 front panel right socket, 104 first inserted link, 105 first spring, 106 first link, 107 second link, 108 second spring, 109 second inserted link, 110 first positioning cover, 111 first knob, 112 second knob, 113 second positioning cover, 114 third inserted link, 115 third spring, 116 third link, 117 fourth link, 118 fourth spring, 119 fourth inserted link, 120 spring plate, 121 pressing plate hook, 122 button, 123 hook, 124 slotted frame, 125 wedge block, 127, hook nut, 129 spring, ejector pin set screw, 129;

2, a frame mechanism, a 201 swing rod, a 201.1 inserting plate, a 202 top cover, a 203 first upright post, a 204 first sliding sleeve, a 205 first spring, a 206 second upright post, a 207 pneumatic rod switch, a 208 lower connecting rod, a 209 upper connecting rod, a 210 pneumatic rod, a 211 fixed upright post, a 212 second spring, a 213 second sliding sleeve, a 214 third upright post, a 215 locking wrench, a 216 cradle inserting rod, a 217 inserting rod spring, a 218 top swinging sleeve, a 219 tail swinging sleeve, a 220 second swing rod and a 221 transverse connecting rod;

3 chassis mechanism, 301 bottom plate, 302 first elastic rod, 303 first upper link, 304 first lower link, 305 left rear leg rod, 305.1 brake frame, 306 left rear wheel, 306.1 left brake disc, 307 brake releasing plate, 308 brake plate, 309 right rear wheel, 310 right rear leg rod, 311 second lower link, 312 second upper link, 313 second elastic rod, 314 third elastic rod, 315 third upper link, 316 third lower link, 317 right front leg rod, 318 right front wheel, 319 fourth elastic rod, 320 fourth upper link, 321 fourth lower link, 322 left front leg rod, 323 left front wheel, 324 brake inserting rod, 325 brake spring, 326 sliding shaft, 327 sliding shaft spring, 328 brake sleeve, 329 brake lower link, 330 brake upper link, 331 rotation shaft;

4 handrail frame.

Detailed Description

The present invention will be further described with reference to specific examples, which are illustrative of the invention and are not to be construed as limiting the invention.

As shown in fig. 1, the multifunctional baby carriage with two seats comprises a first seat 1.1, a second seat 1.2, a frame mechanism 2, a chassis mechanism 3 and an armrest frame 4, and is characterized in that: the first seat 1.1 and the second seat 1.2 have the same structure, the first seat 1.1 and the second seat 1.2 can adjust the pitching inclination angle, and can provide a comfortable sitting and lying space for infants, a flat plane can be formed inside the first seat 1.1 and the second seat 1.2 to facilitate the infants to lie and play, the inclination angle of the seat backrest can be adjusted according to the preferences of the infants, the upper end of the frame mechanism 2 can be connected and separated with the rear ends of the first seat 1.1 and the second seat 1.2 through a modular quick-insertion structure, the frame mechanism 2 adopts a multi-link structure, the height and direction adjustment of the first seat 1.1 and the second seat 1.2 can be conveniently realized, the great flexibility and convenience are achieved, meanwhile, the transverse cradle function of the first seat 1.1 and the second seat 1.2 can be realized according to the pendulum effect, the lower end of the frame mechanism 2 is fixedly connected with the chassis mechanism 3, the lower end of the armrest frame 4 is fixedly connected with the chassis mechanism 3, four wheels that chassis mechanism 3 had are independent suspension to improve chassis mechanism 3's damping performance and pass through the performance, provide more comfortable environment of taking for the infant, also make the head of a family can realize controlling the perambulator more easily through handrail frame 4.

As shown in fig. 3, 4 and 5, the first seat 1.1 includes a frame 101, a rear-turning plate 102, a pressing plate 102.2, a front-turning plate 103, a first insertion rod 104, a first spring 105, a first connecting rod 106, a second connecting rod 107, a second spring 108, a second insertion rod 109, a first positioning cover 110, a first knob 111, a second knob 112, a second positioning cover 113, a third insertion rod 114, a third spring 115, a third connecting rod 116, a fourth connecting rod 117, a fourth spring 118, a fourth insertion rod 119, a spring leaf 120, a pressing plate hook 121, a button 122, a hook 123, a slot frame 124, a wedge block 125, a nut 126, a push rod 127, a hook spring 128 and a set screw 129, the frame 101 is a main body supporting structure of the first seat 1.1, a seat plate 101.1 and a transverse armrest are arranged at a front end thereof, the front-turning plate 103 and the seat plate 101.1 form a rotation pair, and are connected by the first insertion rod 104, the first spring 105, the first connecting rod 106, the first connecting rod 107, the second connecting rod 104, the second connecting rod 107 and the second connecting rod, The tilt angle of the front turning plate 103 is locked by a positioning mechanism consisting of a second spring 108, a second inserted link 109 and a first knob 111, a comfortable leaning backrest is provided for infants, a first positioning cover 110 covers the outside of the positioning mechanism, a revolute pair is formed by the rear turning plate 102 and the front turning plate 103, the rear turning plate 102 is locked relative to the front turning plate 103 by the locking mechanism consisting of a pressing plate 102.2, a pressing plate hook 121 and a spring piece 120, the tilt angle of the rear turning plate 102 is locked by the positioning mechanism consisting of a second knob 112, a third inserted link 114, a third spring 115, a third connecting rod 116, a fourth connecting rod 117, a fourth spring 118 and a fourth inserted link 119 when the front turning plate 103 is in a horizontal state, the second positioning cover 113 covers the outside of the positioning mechanism, a revolute pair is formed by a slot frame 124 and a frame 101, the lower end of the slot frame 124 adjusts the tilt angle of the first seat 1.1 by an adjusting mechanism consisting of a wedge block 125, a nut 126 and a push rod 127, so that the first seat 1.1 can bring comfortable sitting experience for infants with different preferences, and the modular quick-insertion structure composed of the slot frame 124, the button 122, the hook spring 128, the set screw 129 and the hook 123 can realize efficient and quick connection and separation of the first seat 1.1 and the frame mechanism 2.

Six pairs of front positioning holes 101.2 which are distributed in an arc shape at equal intervals are arranged at the two sides of the middle part of the frame 101, five pairs of rear positioning holes 101.3 which are distributed in an arc shape at equal intervals are arranged on the two sides of the rear end of the frame 101, a seat plate 101.1 is arranged at the front end of the frame 101, the lower end of a front turning plate 103 and the rear end of the seat plate 101.1 form a revolute pair, a front plate upright post 103.1, a front plate left socket 103.2 and a front plate right socket 103.3 are arranged on the rear side of the front turning plate 103, two poking posts are arranged on the upper side and the lower side of the front end of a first knob 111, and forms a rotation pair with the front plate upright post 103.1, the first inserted link 104 is arranged in the front plate left socket 103.2 and forms a moving pair, the first spring 105 is arranged between the first inserted link 104 and the front plate left socket 103.2, under the action of the elastic force of the first spring 105, the first inserted bar 104 is always positioned at the left end position of the front plate left socket 103.2, and the first connecting bar 106 is arranged between the right end of the first inserted bar 104 and the upper side poking column at the front end of the first knob 111 and forms a revolute pair with the first inserted bar and the first knob; the second inserted link 109 is installed in the front board right socket 103.3 and constitutes a sliding pair, the second spring 108 is installed between the second inserted link 109 and the front board right socket 103.3, the second inserted link 109 is always located at the right end of the front board right socket 103.3 under the elastic force of the second spring 108, and the second connecting rod 107 is installed between the left end of the second inserted link 109 and the lower side of the front end of the first knob 111 and constitutes a rotating pair with the rear two.

In a natural state, the first insertion rod 104 and the second insertion rod 109 are respectively inserted into a pair of front positioning holes 101.2 at two sides of the frame 101 under the elastic force action of the first spring 105 and the second spring 108, when the inclination angle of the front turning plate 103 needs to be adjusted, the first knob 111 is twisted clockwise, the first insertion rod 104 moves rightwards under the tension action of the first connecting rod 106 and the second connecting rod 107, the second insertion rod 109 moves leftwards, after the first insertion rod 104 and the second insertion rod 109 are separated from the front positioning holes 101.2, the front turning plate 103 can be adjusted to a proper inclination position, the twisting of the first knob 111 is released, the first insertion rod 104 and the second insertion rod 109 are inserted into the front positioning holes 101.2 at new positions, and the inclination angle adjustment action of the front turning plate 103 can be completed; when the first insertion rod 104 and the second insertion rod 109 are inserted into the pair of front positioning holes 101.2 at the lowermost end, the front flap 103 and the seat plate 101.1 can form a plane.

The lower end of the rear turning plate 102 and the upper end of the front turning plate 103 form a rotating pair, the two pressure plate hooks 121 are arranged at the upper end of the front turning plate 103 and form a rotating pair, the spring leaf 120 is arranged between the lower end of the pressure plate hook 121 and the front turning plate 103, the two pressure plates 102.2 are fixedly arranged at the lower end of the rear turning plate 102 through screws, the rear turning plate 102 rotates anticlockwise relative to the front turning plate 103 until the two plates form a plane, the two pressure plates 102.2 can be clamped into the two pressure plate hooks 121, and the pressure plate hooks 121 tightly press the pressure plates 102.2 under the action of the elastic force of the spring leaf 120, so that the rotation; the lower ends of the two pressure plate hooks 121 are pressed to rotate anticlockwise, and the rotation of the rear turning plate 102 relative to the front turning plate 103 can be recovered after the pressure plate 102.2 is separated from the pressure plate hooks 121.

A rear plate upright post 102.1, a rear plate right socket 102.3 and a rear plate left socket 102.4 are arranged at the rear side of the rear turning plate 102, two poking columns are arranged at the upper side and the lower side of the front end of the second knob 112 and form a revolute pair with the rear plate upright post 102.1, a third inserted bar 114 is arranged in the rear plate right socket 102.3 and forms a revolute pair, a third spring 115 is arranged between the third inserted bar 114 and the rear plate right socket 102.3, the third inserted bar 114 is always positioned at the right end of the rear plate right socket 102.3 under the elastic force of the third spring 115, and a third connecting rod 116 is arranged between the left end of the third inserted bar 114 and the poking column at the lower side of the front end of the second knob 112 and forms a revolute pair with the rear two; the fourth inserted bar 119 is installed in the rear plate left socket 102.4 and constitutes a sliding pair, the fourth spring 118 is installed between the fourth inserted bar 119 and the rear plate left socket 102.4, the fourth inserted bar 119 is always located at the left end position of the rear plate left socket 102.4 under the elastic force action of the fourth spring 118, and the fourth connecting rod 117 is installed between the right end of the fourth inserted bar 119 and the upper side shifting column at the front end of the second knob 112 and constitutes a rotating pair with the rear two.

After the front turning plate 103 and the seat plate 101.1 form a plane, in a natural state, the third insertion rod 114 and the fourth insertion rod 119 are respectively inserted into the pair of rear positioning holes 101.3 under the elastic force action of the third spring 115 and the fourth spring 118, when the inclination angle of the rear turning plate 102 needs to be adjusted, the second knob 112 is twisted clockwise, the third insertion rod 114 moves leftwards and the fourth insertion rod 119 moves rightwards under the pulling force action of the third connecting rod 116 and the fourth connecting rod 117, after the third insertion rod 114 and the fourth insertion rod 119 are separated from the rear positioning holes 101.3, the rear turning plate 102 can be adjusted to a proper inclination position, the twisting of the second knob 112 is released, the third insertion rod 114 and the fourth insertion rod 119 are inserted into the rear positioning holes 101.3 at new positions, and the inclination angle adjustment action of the rear turning plate 102 can be completed; when the third insertion rod 114 and the fourth insertion rod 119 are inserted into the pair of rear positioning holes 101.3 at the lowermost end, the rear turning plate 102, the front turning plate 103 and the seat plate 101.1 form a plane for the infant to have a rest.

The rear side of the frame 101 is provided with a connecting seat 101.5 and a top rod seat 101.4, the upper end of the left side of the slot frame 124 and the connecting seat 101.5 form a revolute pair, the upper end of the right side of the slot frame 124 is provided with a rectangular groove, the upper end of the rectangular groove is provided with two rectangular jacks, the lower end of the slot frame 124 is internally provided with a hook cavity and a transverse button hole, the hook 123 is arranged in the hook cavity and can slide up and down in the hook cavity, the upper end of the hook 123 is provided with an inclined plane structure, the middle position is provided with a rectangular opening, the lower side of the button 122 is provided with an inclined plane, the button 122 passes through the rectangular opening in the middle of the hook 123 and is arranged in the button hole of the slot frame 124, the lower end of the slot frame 124 is provided with two threaded holes communicated with the hook cavity, two holding screws 129 are respectively arranged in the two threaded holes, the threaded structure at the right end, together with two wedge blocks 125 and two nuts 126, clamps the lower end of the slot carrier 124.

In an initial state, under the action of the elastic force of the hook spring 128, the hook 123 is positioned at the upper end of the hook cavity, the inclined plane structure at the upper end of the hook 123 extends into the rectangular groove at the upper end of the right side of the slot frame 124, the button 122 is pressed leftwards, the inclined plane at the lower side of the button pushes the hook 123 to move downwards, and the inclined plane structure at the upper end of the hook 123 retracts into the hook cavity; after releasing the pressing of the button 122, the hook 123 is restored to the original position by the elastic force of the hook spring 128.

The set screw 129 and the slot frame 124 form a thread pair connection, and the compression amount of the hook spring 128 can be changed by adjusting the position of the set screw 129, so that the pressing and rebounding force of the button 122 can be adjusted.

The adjustment of the pitch angle of the first seat 1.1 can be achieved by adjusting the position of the two nuts 126 on the carrier bar 127: the two nuts 126 move leftwards on the top bar 127, so that the front end of the first seat 1.1 inclines downwards, and the two nuts 126 move rightwards on the top bar 127, so that the front end of the first seat 1.1 inclines upwards.

As shown in fig. 1, 2 and 6, the frame mechanism 2 includes a first swing link 201, a top cover 202, a first upright 203, a first sliding sleeve 204, a first spring 205, a second upright 206, a pneumatic rod switch 207, a lower connecting rod 208, an upper connecting rod 209, a pneumatic rod 210, a fixed upright 211, a second spring 212, a second sliding sleeve 213, a third upright 214, a locking wrench 215, a cradle inserting rod 216, an inserting rod spring 217, a top swinging sleeve 218, a tail swinging sleeve 219, a second swing link 220 and a cross connecting rod 221, the frame mechanism 2 can realize modular connection with the first seat 1.1 through the first swing link 201, realize modular connection with the second seat 1.2 through the second swing link 220, and realize synchronous transverse cradle function based on the pendulum effect through the cross connecting rod 221 for the first seat 1.1 and the second seat 1.2, the first upright 203 is in a T-shaped structure, the locking bar 215 positioned at the left side of the upper end of the first upright 203 can realize locking function for the first seat 1.1 through the cradle inserting rod 216, the first upright 203 can rotate relative to the second upright 206 and is locked by the first sliding sleeve 204, the lower connecting rod 208 and the upper connecting rod 209 are arranged between the second upright 206 and the third upright 214 to form a parallelogram structure, the pneumatic rod 210 is arranged between the lower connecting rod 208 and the upper connecting rod 209 through the top swinging sleeve 218 and the tail swinging sleeve 219 and is used for adjusting the height of the second upright 206, the lower end of the fixed upright 211 is fixedly connected with the chassis mechanism 3, and the third upright 214 can rotate relative to the fixed upright 211 and is locked by the second sliding sleeve 213.

The first swing link 201 and the second swing link 220 have the same structure, the left end of the first swing link 201 is a rectangular plate structure with the same size as the rectangular groove at the upper end of the right side of the slot frame 124, the upper end of the rectangular plate structure is provided with two insert plates 201.1, the right end of the first swing link 201 is a round shaft structure, a round shaft structure is vertically provided with a round hole at the upper side, the round shaft structure forms a rotating pair with the left end of the upper side of the first upright 203 through a bearing, the round shaft structure at the right end of the second swing link 220 forms a rotating pair with the right end of the upper side of the first upright 203 through a bearing, the left end of the transverse connecting rod 221 forms a rotating pair with the first swing link 201, the right end forms a rotating pair with the second swing link 220, the first swing link 201, the second swing link 220, the first upright 203 and the transverse connecting rod 221 form a parallelogram structure, the left end of the upper side of the first upright 203 is vertically provided with a stepped round hole, the, the lower end of the locking wrench 215 and the upper end of the cradle insert bar 216 form a revolute pair, and the top cover 202 is mounted on the left end of the upper side of the first upright 203.

The left end rectangular plate structure of the first swing rod 201 can be embedded into the rectangular groove of the slot frame 124, two slots 201.1 at the upper end of the rectangular plate structure are inserted into two rectangular insertion holes at the upper end of the rectangular groove of the slot frame 124, and the hook 123 can hook the lower edge of the rectangular plate structure, so that the modular connection of the first seat 1.1 and the frame mechanism 2 is realized; the hook 123 can be retracted by pressing the button 112, so that the connection between the first seat 1.1 and the frame mechanism 2 can be released; the modular connection principle of the second seat 1.2 to the frame mechanism 2 via the second rocker 220 is the same as described above.

As shown in fig. 7 and 8, in the initial state, the locking wrench 215 is in the vertical state, the cradle insert rod 216 is inserted downward into the circular hole on the upper side of the circular shaft structure at the right end of the first swing link 201 under the elastic force of the insert rod spring 217, so as to lock the cradle function of the first seat 1.1 and the second seat 1.2, and after the locking wrench 215 is pulled backward to the horizontal state, the cradle insert rod 216 moves upward and is separated from and held in the circular hole on the upper side of the circular shaft structure at the right end of the first swing link 201, so that the cradle function of the first seat 1.1 and the second seat 1.2 can be restored.

As shown in fig. 9 and 10, the lower end of the first upright 203 is provided with an external spline, the upper end of the second upright 206 forms a revolute pair with the lower end of the first upright 203 through two deep groove ball bearings and a thrust ball bearing, the position of the second upright 206 near the upper end is provided with an external spline, the upper end and the lower end inside the first sliding sleeve 204 are both provided with internal splines, the internal splines at the lower end of the first sliding sleeve cooperate with the external splines on the second upright 206 to form a sliding pair, so that the first sliding sleeve 204 can slide on the second upright 206 but cannot rotate, the internal splines at the upper end inside the first sliding sleeve 204 can cooperate with the external splines at the lower end of the first upright 203, and a first spring 205 is arranged between the lower end of the first sliding sleeve.

In the initial state, under the action of the elastic force of the first spring 205, the internal spline at the upper end of the first sliding sleeve 204 is always matched with the external spline at the lower end of the first upright column 203, so that the rotation of the first upright column 203 relative to the second upright column 206 is locked; when the first upright 203 needs to be rotated, the first sliding sleeve 204 can be pressed downwards, so that the inner spline at the upper end of the first sliding sleeve is separated from the matching with the outer spline at the lower end of the first upright 203, the first upright 203 can be rotated to a proper angle, then the pressing of the first sliding sleeve 204 is released, so that the inner spline at the upper end of the first sliding sleeve is matched with the outer spline at the lower end of the first upright 203, and the position of the first upright 203 is locked.

As shown in fig. 11 and 12, the lower end of the third upright 214 is provided with an external spline, the upper end of the fixed upright 211 forms a revolute pair with the lower end of the third upright 214 through two deep groove ball bearings and a thrust ball bearing, the position of the fixed upright 211 near the upper end is provided with an external spline, the upper end and the lower end inside the second sliding sleeve 213 are both provided with internal splines, the internal spline at the lower end of the second sliding sleeve 213 is matched with the external spline on the fixed upright 211 to form a sliding pair, so that the second sliding sleeve 213 can slide on the fixed upright 211 but cannot rotate, the internal spline at the upper end inside the second sliding sleeve 213 can be matched with the external spline at the lower end of the third upright 214, and a second spring 212 is arranged between.

In the initial state, the internal spline at the upper end of the second sliding sleeve 213 is always matched with the external spline at the lower end of the third upright post 214 under the action of the elastic force of the second spring 212, so that the rotation of the third upright post 214 relative to the fixed upright post 211 is locked; when the third upright 214 needs to be rotated, the second sliding sleeve 213 can be pressed downwards, so that the internal spline at the upper end of the second sliding sleeve is separated from the matching with the external spline at the lower end of the third upright 214, the third upright 214 can be rotated to a proper angle, then the pressing on the second sliding sleeve 213 is released, so that the internal spline at the upper end of the second sliding sleeve is matched with the external spline at the lower end of the third upright 214, and the position of the third upright 214 is locked.

As shown in fig. 2, 11 and 12, after the second sliding sleeve 213 is pressed downward and the third upright 214 is rotated by 180 °, the pressing of the second sliding sleeve 213 is released, so as to lock the position of the third upright 214, so that the first seat 1.1 and the second seat 1.2 can be changed from the front direction to the rear direction, and the infant can be changed from the state of facing away from the parent to the state of facing the parent.

The left ends of the upper connecting rod 209 and the lower connecting rod 208 and the third upright post 214 form a rotating pair, the right ends of the upper connecting rod 209 and the lower connecting rod 208 and the second upright post 206 form a rotating pair, the upper connecting rod 209 is installed on the upper side of the lower connecting rod 208, the upper connecting rod 209, the lower connecting rod 208, the second upright post 206 and the third upright post 214 form a parallelogram structure, the upper end of the air pressure rod 210 and the upper connecting rod 209 form a rotating pair through a top swing sleeve 218, the lower end of the air pressure rod 210 and the lower connecting rod 208 form a rotating pair through a tail swing sleeve 219, and the air pressure rod switch 207 is installed at the top end of the air.

When the first seat 1.1 and the second seat 1.2 are in an unloaded state, the air pressure bar switch 207 is turned downwards to extend the air pressure bar 210, so that the position of the second upright post 206 is raised, and the first seat 1.1 and the second seat 1.2 are raised; in the state of pulling the air pressure bar switch 207 downwards, the first upright column 203 is pressed downwards, the air pressure bar 210 can be contracted, so that the first seat 1.1 and the second seat 1.2 are lowered, the length of the air pressure bar 210 can be locked by releasing the air pressure bar switch 207, and the height positions of the first seat 1.1 and the second seat 1.2 can be locked.

As shown in fig. 13, the chassis mechanism 3 includes a base plate 301, a first elastic rod 302, a first upper link 303, a first lower link 304, a left rear leg 305, a left rear wheel 306, a right rear wheel 309, a right rear leg 310, a second lower link 311, a second upper link 312, a second elastic rod 313, a third elastic rod 314, a third upper link 315, a third lower link 316, a right front leg 317, a right front wheel 318, a fourth elastic rod 319, a fourth upper link 320, a fourth lower link 321, a left front leg 322, a left front wheel 323, and a brake mechanism, the base plate 301 is a support main body of the chassis mechanism 3, the left front wheel 323 is a universal wheel structure and is independently suspended by the left front leg 322, the fourth lower link 321, the fourth upper link 320, the fourth elastic rod 319, the right front wheel is a universal wheel structure and is independently suspended by the right front leg 317, the third lower link 316, the third upper link 315, the third elastic rod 314, the left rear wheel 306 has a brake mechanism, the left rear leg rod 305, the first lower connecting rod 304, the first upper connecting rod 303 and the first elastic rod 302 form independent suspension, the right rear wheel 309 is provided with a brake mechanism, the right rear leg rod 310, the second lower connecting rod 311, the second upper connecting rod 312 and the second elastic rod 313 form independent suspension, and the four-wheel independent suspension improves the damping performance and the passing performance of the chassis mechanism 3, provides a more comfortable riding environment for infants and enables parents to more easily realize the control of the baby carriage.

The front end of the left front leg rod 322 and the upper end of the left front wheel 323 form a revolute pair, the rear end of the left front leg rod and the left side of the front end of the bottom plate 301 form a revolute pair, the rear end of the fourth upper connecting rod 320 and the left side of the front end of the bottom plate 301 form a revolute pair, the upper end of the fourth lower connecting rod 321 and the front end of the fourth upper connecting rod 320 form a revolute pair, the lower end of the fourth lower connecting rod and the left front leg rod 322 form a revolute pair, a spring is arranged in the fourth elastic rod 319, the rear end of the fourth elastic rod and the upper side of the bottom plate 301 form a; the front end of the right front leg bar 317 and the upper end of the right front wheel 318 form a revolute pair, the rear end of the right front leg bar 317 and the right side of the front end of the bottom plate 301 form a revolute pair, the rear end of the third upper link 315 and the right side of the front end of the bottom plate 301 form a revolute pair, the upper end of the third lower link 316 and the front end of the third upper link 315 form a revolute pair, the lower end of the third lower link 316 and the right front leg bar 317 form a revolute pair, the rear end of the third elastic bar 314 is provided with a spring, the rear end of the third elastic bar and the upper side of the bottom plate 301.

The front end of the left rear leg rod 305 and the left side of the rear end of the bottom plate 301 form a revolute pair, the upper side of the rear end of the left rear leg rod 305 is provided with a brake frame 305.1, the lower side of the brake frame 305.1 is provided with a set of brake mechanism, the lower side of the rear end of the left rear leg rod 305 and the left rear wheel 306 form a revolute pair, the right side of the left rear wheel 306 is provided with a left brake disc 306.1, eighteen jacks are uniformly arranged on the left brake disc 306.1 in the circumferential direction, the brake mechanism can lock the left brake disc 306.1 so as to lock the rotation of the left rear wheel 306, the front end of the first upper connecting rod 303 and the left side of the rear end of the bottom plate 301 form a revolute pair, the upper end of the first lower connecting rod 304 and the rear end of the first upper connecting rod 303 form a revolute pair, the lower end of the first elastic rod 305 and the upper side of the; the front end of the right rear leg rod 310 and the right side of the rear end of the bottom plate 301 form a revolute pair, the upper side of the rear end of the right rear leg rod 310 is provided with a brake frame, the lower side of the rear end of the right rear leg rod 310 and the right rear wheel 309 form a revolute pair, the left side of the right rear wheel 309 is provided with a right brake disc, eighteen insertion holes are uniformly formed in the circumferential direction of the right brake disc, the brake mechanism can lock the right brake disc so as to lock the rotation of the right rear wheel 309, the front end of the second upper connecting rod 312 and the right side of the rear end of the bottom plate 301 form a revolute pair, the upper end of the second lower connecting rod 311 and the rear end of the second upper connecting rod 312 form a revolute pair, a spring is arranged in the second elastic rod 313, the front end of the second elastic rod and the upper.

As shown in fig. 14 and 15, the brake mechanism includes a brake releasing plate 307, a brake plate 308, a brake inserting rod 324, a brake spring 325, a sliding shaft 326, a sliding shaft spring 327, a brake shaft sleeve 328, a brake lower connecting rod 329, a brake upper connecting rod 330, and a rotating shaft 331, wherein the upper end of the brake shaft sleeve 328 is tightly connected with the brake frame 305.1, the sliding shaft 326 is coaxially installed inside the brake shaft sleeve 328 and forms a sliding pair, the sliding shaft spring 327 is installed between the two, the brake inserting rod 324 is coaxially installed at the lower end of the sliding shaft 326 and forms a sliding pair, the brake spring 325 is installed between the two, the left end of the brake releasing plate 307 is of a pedal structure, the upper end of the right end of the brake releasing plate forms a rotating pair with the brake shaft sleeve 328, the lower end of the right end of the brake lower connecting rod 329 forms a rotating pair with the left end of the brake lower connecting rod 329, the left end of the brake plate 308 is of a, the lower end of the brake lower connecting rod 329, the right end of the brake plate 308 form a coaxial rotating pair through a rotating shaft 331.

In the initial state, the brake mechanism is in the released state, the sliding shaft 326 is located at the uppermost position inside the brake sleeve 328 under the elastic force of the sliding shaft spring 327, the brake inserting rod 324 is located at the lowermost position of the sliding shaft 326 under the elastic force of the brake spring 325, and the brake inserting rod 324 is not in contact with the left brake disc 306.1, at this time, the left end of the brake plate 308 is located at the upper position, and the left end of the brake releasing plate 307 is located at the lower position.

As shown in fig. 16 and 17, when the left rear wheel 306 needs to be braked, the left end of the brake plate 308 is stepped downwards, the sliding shaft 326 moves downwards until the rotating shaft 331 contacts and abuts against the outer side surface of the brake shaft sleeve 328, in the process, the brake inserted rod 324 is inserted into the insertion hole on the left brake disc 306.1, the left end of the brake releasing plate 307 moves to the upper position, and the brake process of the left rear wheel 306 is completed by releasing the brake plate 308 which is positioned at the lower position.

When the brake of the left rear wheel 306 needs to be released, the left end of the brake releasing plate 307 is stepped downwards, the rotating shaft 331 is pushed away from the brake shaft sleeve 328 through the brake lower connecting rod 329, the sliding shaft 326 is pushed to the uppermost position under the action of the elastic force of the sliding shaft spring 327, the brake inserting rod 324 is pulled away from the inserting hole of the left brake disc 306.1, the brake plate 308 moves from the low position to the high position, the brake releasing plate 307 moves to the low position, and the action of releasing the brake of the left rear wheel 306 is completed.

The braking and brake release principles of the right rear wheel 309 are the same as the left rear wheel 306.

The references to "front", "back", "left", "right", etc., are to be construed as being based on the orientation or positional relationship shown in the drawings or as would normally be placed upon use of the inventive article, and are intended to be descriptive only and not as indicating or implying that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Claims

1. Multi-functional perambulator of two seats, including first seat (1.1), second seat (1.2), frame mechanism (2), chassis mechanism (3), handrail frame (4), its characterized in that: the first seat (1.1) and the second seat (1.2) have the same structure, the first seat (1.1) and the second seat (1.2) can adjust the pitching inclination angle and provide a comfortable sitting and lying space for infants, a flat plane can be formed inside the first seat (1.1) and the second seat (1.2) to facilitate the infants to lie and play, the backrest inclination angles of the two seats can be adjusted according to the preference of the infants, the upper end of the frame mechanism (2) and the rear ends of the first seat (1.1) and the second seat (1.2) can be connected and separated through a modular quick-plug structure, the frame mechanism (2) adopts a multi-link structure, the height and direction adjustment of the first seat (1.1) and the second seat (1.2) can be conveniently realized, the great flexibility and convenience are realized, the transverse cradle function of the first seat (1.1) and the second seat (1.2) can be realized according to the pendulum effect, the lower end of the frame mechanism (2) is tightly connected with the chassis mechanism (3), the lower end of the armrest frame (4) is fixedly connected with the chassis mechanism (3), and four wheels arranged below the chassis mechanism (3) are independently suspended, so that the damping performance and the passing performance of the chassis mechanism (3) are improved, a more comfortable riding environment is provided for infants, and parents can control the baby carriage more easily through the armrest frame (4).

2. The tandem multi-function stroller of claim 1, wherein: the first seat (1.1) comprises a frame (101), a rear overturning plate (102), a pressing plate (102.2), a front overturning plate (103), a first inserted link (104), a first spring (105), a first connecting link (106), a second connecting link (107), a second spring (108), a second inserted link (109), a first positioning cover (110), a first knob (111), a second knob (112), a second positioning cover (113), a third inserted link (114), a third spring (115), a third connecting link (116), a fourth connecting link (117), a fourth spring (118), a fourth inserted link (119), a spring leaf (120), a pressing plate hook (121), a button (122), a hook (123), a slot frame (124), a wedge block (125), a nut (126), a top rod (127), a hook spring (128) and a set screw (129), wherein the frame (101) is a main body supporting structure of the first seat (1.1), the front end of the backrest is provided with a seat plate (101.1) and a transverse armrest, a front turning plate (103) and the seat plate (101.1) form a revolute pair, the inclination angle of the front turning plate (103) is locked through a positioning mechanism consisting of a first inserted link (104), a first spring (105), a first connecting link (106), a second connecting link (107), a second spring (108), a second inserted link (109) and a first knob (111) to provide a comfortable backrest for infants, a first positioning cover (110) covers the outer side of the positioning mechanism, a rear turning plate (102) and the front turning plate (103) form a revolute pair, the locking of the rear turning plate (102) relative to the front turning plate (103) is realized through a locking mechanism consisting of a pressing plate (102.2), a pressing plate hook (121) and a spring piece (120), and the second knob (112), a third inserted link (114), a third spring (115), a third connecting link (116), a fourth connecting link (117), The positioning mechanism composed of a fourth spring (118) and a fourth inserting rod (119) can lock the inclination angle of the rear turning plate (102) when the front turning plate (103) is in a horizontal state, the second positioning cover (113) covers the outer side of the positioning mechanism, the slot frame (124) and the frame (101) form a revolute pair, the lower end of the slot frame (124) adjusts the pitch inclination angle of the first seat (1.1) through an adjusting mechanism composed of a wedge block (125), a nut (126) and an ejector rod (127), so that the first seat (1.1) can bring comfortable sitting experience for infants with different preferences, and the modular quick-insertion structure composed of the slot frame (124), a button (122), a hook spring (128), a set screw (129) and a hook (123) can realize efficient and quick connection and separation of the first seat (1.1) and the frame mechanism (2).

3. The tandem multi-function stroller of claim 2, wherein: six pairs of front positioning holes (101.2) are formed in two sides of the middle of the frame (101) and are distributed in an equidistant circular arc mode, five pairs of rear positioning holes (101.3) are formed in two sides of the rear end of the frame (101) and are distributed in an equidistant circular arc mode, a seat plate (101.1) is arranged at the front end of the frame (101), a revolute pair is formed by the lower end of a front turning plate (103) and the rear end of the seat plate (101.1), a front plate upright post (103.1), a front plate left socket (103.2) and a front plate right socket (103.3) are arranged on the rear side of the front turning plate (103), two shifting posts are arranged on the upper side and the lower side of the front end of a first knob (111) and form a revolute pair with the front plate upright post (103.1), a first insertion rod (104) is installed in the front plate left socket (103.2) and forms a revolute pair, a first spring (105) is installed between the first insertion rod (104) and the front plate left socket (103.2), and a first insertion rod (104) is installed at the position of the first shifting post (106) and the right end of the first knob (111) under the first insertion rod And form revolute pairs with the latter two; the second inserted bar (109) is arranged in the front plate right socket (103.3) and forms a moving pair, the second spring (108) is arranged between the second inserted bar (109) and the front plate right socket (103.3), the second inserted bar (109) is always positioned at the right end of the front plate right socket (103.3) under the action of the elastic force of the second spring (108), and the second connecting rod (107) is arranged between the left end of the second inserted bar (109) and the lower side shifting column at the front end of the first knob (111) and forms a rotating pair with the rear two;

in a natural state, the first inserted link (104) and the second inserted link (109) are respectively inserted into a pair of front positioning holes (101.2) at two sides of the frame (101) under the action of the elastic forces of the first spring (105) and the second spring (108), when the inclination angle of the front turning plate (103) needs to be adjusted, the first knob (111) is twisted clockwise, under the action of the pulling force of the first connecting rod (106) and the second connecting rod (107), the first inserted link (104) moves rightwards, the second inserted link (109) moves leftwards, after the first inserted link (104) and the second inserted link (109) are separated from the front positioning hole (101.2), the front turning plate (103) can be adjusted to a proper inclined position, and the first knob (111) is loosened to enable the first insertion rod (104) and the second insertion rod (109) to be inserted into the front positioning hole (101.2) at a new position, so that the inclination angle adjustment action of the front turning plate (103) can be completed; when the first insertion rod (104) and the second insertion rod (109) are inserted into the pair of front positioning holes (101.2) at the lowermost end, the front turning plate (103) and the seat plate (101.1) form a plane;

the lower end of the rear turning plate (102) and the upper end of the front turning plate (103) form a revolute pair, the two pressure plate hooks (121) are mounted at the upper end of the front turning plate (103) and form the revolute pair, the spring leaf (120) is mounted between the lower end of the pressure plate hook (121) and the front turning plate (103), the two pressure plates (102.2) are fixedly mounted at the lower end of the rear turning plate (102) through screws, the rear turning plate (102) rotates anticlockwise relative to the front turning plate (103) until the rear turning plate and the front turning plate form a plane, the two pressure plates (102.2) can be clamped into the two pressure plate hooks (121), and under the action of the elastic force of the spring leaf (120), the pressure plate hooks (121) compress the pressure plates (102.2), so; the lower ends of the two pressure plate hooks (121) are pressed to rotate anticlockwise, and the rotation of the rear turning plate (102) relative to the front turning plate (103) can be restored after the pressure plate (102.2) is separated from the pressure plate hooks (121);

a rear plate upright post (102.1), a rear plate right socket (102.3) and a rear plate left socket (102.4) are arranged on the rear side of the rear turning plate (102), two poking columns are arranged on the upper side and the lower side of the front end of the second knob (112) and form a revolute pair with the rear plate upright post (102.1), a third inserted bar (114) is installed in the rear plate right socket (102.3) and form a revolute pair, a third spring (115) is installed between the third inserted bar (114) and the rear plate right socket (102.3), the third inserted bar (114) is always positioned at the right end of the rear plate right socket (102.3) under the action of the elastic force of the third spring (115), and a third connecting rod (116) is installed between the left end of the third inserted bar (114) and the poking column on the lower side of the front end of the second knob (112) and form a revolute pair with the rear inserted bar and the rear; the fourth inserted bar (119) is arranged in the rear plate left socket (102.4) to form a sliding pair, the fourth spring (118) is arranged between the fourth inserted bar (119) and the rear plate left socket (102.4), the fourth inserted bar (119) is always positioned at the left end position of the rear plate left socket (102.4) under the elastic force action of the fourth spring (118), and the fourth connecting rod (117) is arranged between the right end of the fourth inserted bar (119) and the upper side shifting column at the front end of the second knob (112) and forms a rotating pair with the rear two;

after the front turning plate (103) and the seat plate (101.1) form a plane, under the natural state, a third inserted link (114) and a fourth inserted link (119) are respectively inserted into a pair of rear positioning holes (101.3) under the elastic force action of a third spring (115) and a fourth spring (118), when the inclination angle of the rear turning plate (102) needs to be adjusted, the second knob (112) is twisted clockwise, under the action of the tension of the third connecting rod (116) and the fourth connecting rod (117), the third inserted link (114) moves leftwards, the fourth inserted link (119) moves rightwards, after the third inserted link (114) and the fourth inserted link (119) are separated from the rear positioning hole (101.3), the rear turning plate (102) can be adjusted to a proper inclined position, and the second knob (112) is loosened to enable the third insertion rod (114) and the fourth insertion rod (119) to be inserted into the rear positioning hole (101.3) at a new position, so that the inclination angle adjustment action of the rear turning plate (102) can be completed; when the third insertion rod (114) and the fourth insertion rod (119) are inserted into the pair of rear positioning holes (101.3) at the lowest end, the rear turning plate (102), the front turning plate (103) and the seat plate (101.1) form a plane for the infant to lie and rest.

4. The tandem multi-function stroller of claim 2, wherein: the rear side of the frame (101) is provided with a connecting seat (101.5) and a top rod seat (101.4), the upper end of the left side of the slot frame (124) and the connecting seat (101.5) form a revolute pair, the upper end of the right side of the slot frame (124) is provided with a rectangular groove, the upper end of the rectangular groove is provided with two rectangular jacks, the lower end of the slot frame (124) is internally provided with a hook cavity and a transverse button hole, a hook (123) is arranged in the hook cavity and can slide up and down in the hook cavity, the upper end of the hook (123) is provided with an inclined plane structure, the middle position of the hook is provided with a rectangular opening, the lower side of the button (122) is provided with an inclined plane, the button (122) passes through the rectangular opening in the middle of the hook (123) and is arranged in the button hole of the slot frame (124), the lower end of the slot frame (124) is provided with two threaded holes communicated with the hook cavity, two fastening screws (129) are, the left end of the ejector rod (127) and the ejector rod seat (101.4) form a rotating pair, and the threaded structure at the right end, the two wedge-shaped blocks (125) and the two nuts (126) clamp the lower end of the slot frame (124) together;

in an initial state, under the action of the elastic force of a hook spring (128), a hook (123) is positioned at the upper end of a hook cavity, an inclined plane structure at the upper end of the hook (123) extends into a rectangular groove at the upper end of the right side of a slot frame (124), and an inclined plane at the lower side of a button (122) is pressed leftwards to push the hook (123) to move downwards, so that the inclined plane structure at the upper end of the hook (123) is retracted into the hook cavity; after the press of the button (122) is released, the hook (123) returns to the initial position under the action of the elastic force of the hook spring (128);

the set screw (129) and the slot frame (124) form a thread pair connection, and the compression amount of the hook spring (128) can be changed by adjusting the position of the set screw (129), so that the pressing and rebounding force of the button (122) can be adjusted;

the adjustment of the pitch angle of the first seat (1.1) can be realized by adjusting the positions of the two nuts (126) on the mandril (127): when the two nuts (126) move leftwards on the ejector rod (127), the front end of the first seat (1.1) inclines downwards, and when the two nuts (126) move rightwards on the ejector rod (127), the front end of the first seat (1.1) inclines upwards.

5. The tandem multi-function stroller of claim 1, wherein: the frame mechanism (2) comprises a first swing rod (201), a top cover (202), a first upright post (203), a first sliding sleeve (204), a first spring (205), a second upright post (206), a pneumatic rod switch (207), a lower connecting rod (208), an upper connecting rod (209), a pneumatic rod (210), a fixed upright post (211), a second spring (212), a second sliding sleeve (213), a third upright post (214), a locking wrench (215), a cradle inserted bar (216), an inserted bar spring (217), a top swinging sleeve (218), a tail swinging sleeve (219), a second swing rod (220) and a transverse connecting rod (221), the frame mechanism (2) can realize the modular connection with the first seat (1.1) through the first swing rod (201), realize the modular connection with the second seat (1.2) through the second swing rod (220), and realize the synchronous transverse function based on the pendulum effect of the cradle by the first seat (1.1) and the second seat (1.2) through the transverse connecting rod (221), the first upright post (203) is of a T-shaped structure, a locking wrench (215) positioned at the left side position of the upper end of the first upright post (203) can realize the locking of the cradle function of the first seat (1.1) through a cradle inserted bar (216), the first upright post (203) can rotate relative to the second upright post (206), the rotating position is locked by a first sliding sleeve (204), a lower connecting rod (208) and an upper connecting rod (209) are arranged between a second upright post (206) and a third upright post (214) to form a parallelogram structure, a pneumatic rod (210) is arranged between the lower connecting rod (208) and the upper connecting rod (209) through a top swinging sleeve (218) and a tail swinging sleeve (219), the height of the second upright post (206) is adjusted, the lower end of the fixed upright post (211) is fixedly connected with the chassis mechanism (3), and the third upright post (214) can rotate relative to the fixed upright post (211) and is locked at the rotating position by the second sliding sleeve (213).

6. The tandem multi-function stroller of claim 5, wherein: the first swing rod (201) and the second swing rod (220) have the same structure, the left end of the first swing rod (201) is of a rectangular plate structure with the same size as a rectangular groove at the upper end of the right side of the slot frame (124), two inserting plates (201.1) are arranged at the upper end of the rectangular plate structure, the right end of the first swing rod (201) is of a round shaft structure, a round hole is vertically arranged on the round shaft structure, the round shaft structure and the left end of the upper side of the first upright post (203) form a rotating pair through a bearing, the round shaft structure at the right end of the second swing rod (220) and the right end of the upper side of the first upright post (203) form a rotating pair through a bearing, the left end of the transverse connecting rod (221) and the first swing rod (201) form a rotating pair, the right end and the second swing rod (220) form a rotating pair, the first swing rod (201), the second swing rod (220), the first upright post (203) and the transverse, the cradle inserted bar (216) is coaxially arranged in the stepped circular hole to form a moving pair, the inserted bar spring (217) is arranged between the upper end of the first upright post (203) and the cradle inserted bar (216), the lower end of the locking wrench (215) and the upper end of the cradle inserted bar (216) form a rotating pair, and the top cover (202) is arranged at the left end of the upper side of the first upright post (203);

the left end rectangular plate structure of the first swing rod (201) can be embedded into the rectangular groove of the slot frame (124), two inserting plates (201.1) at the upper ends of the rectangular plate structures are inserted into the two rectangular inserting holes at the upper ends of the rectangular grooves of the slot frame (124), and the hook (123) can hook the lower edge of the rectangular plate structure, so that the modular connection of the first seat (1.1) and the frame mechanism (2) is realized; the hook (123) can be retracted by pressing the button (112), so that the connection between the first seat (1.1) and the frame mechanism (2) can be released; the modular connection principle of the second seat (1.2) and the frame mechanism (2) through the second swing rod (220) is the same as that described above;

in the initial state, the locking wrench (215) is in a vertical state, the cradle inserted link (216) is downwards inserted into the round hole on the upper side of the round shaft structure at the right end of the first swing link (201) under the action of the elastic force of the inserted link spring (217), so that the cradle function of the first seat (1.1) and the second seat (1.2) is locked, after the locking wrench (215) is pulled backwards to a horizontal state, the cradle inserted link (216) upwards moves and is separated from the round hole on the upper side of the round shaft structure at the right end of the first swing link (201) and is kept, and therefore the cradle function of the first seat (1.1) and the second seat (1.2) can be recovered.

7. The tandem multi-function stroller of claim 5, wherein: the lower end of the first upright post (203) is provided with an external spline, the upper end of the second upright post (206) forms a revolute pair with the lower end of the first upright post (203) through two deep groove ball bearings and a thrust ball bearing, the position of the second upright post (206) close to the upper end is provided with an external spline, the upper end and the lower end inside the first sliding sleeve (204) are provided with internal splines, the internal splines at the lower end of the first sliding sleeve are matched with the external splines on the second upright post (206) to form a revolute pair, so that the first sliding sleeve (204) can slide on the second upright post (206) and cannot rotate, the internal splines at the upper end inside the first sliding sleeve (204) can be matched with the external splines at the lower end of the first upright post (203), and a first spring (205) is arranged between the lower;

in an initial state, under the action of the elastic force of a first spring (205), an internal spline at the upper end of the first sliding sleeve (204) is always matched with an external spline at the lower end of the first upright post (203), so that the rotation of the first upright post (203) relative to the second upright post (206) is locked; when the first upright post (203) needs to be rotated, the first sliding sleeve (204) can be pressed downwards, so that the inner spline at the upper end of the first sliding sleeve is separated from the matching with the outer spline at the lower end of the first upright post (203), the first upright post (203) can be rotated to a proper angle, and then the pressing of the first sliding sleeve (204) is released, so that the inner spline at the upper end of the first sliding sleeve is matched with the outer spline at the lower end of the first upright post (203), and the position of the first upright post (203) is locked;

the lower end of a third upright post (214) is provided with an external spline, the upper end of a fixed upright post (211) forms a revolute pair with the lower end of the third upright post (214) through two deep groove ball bearings and a thrust ball bearing, the position of the fixed upright post (211) close to the upper end is provided with the external spline, the upper end and the lower end in a second sliding sleeve (213) are both provided with the internal spline, the internal spline at the lower end of the second sliding sleeve is matched with the external spline on the fixed upright post (211) to form a revolute pair, so that the second sliding sleeve (213) can slide on the fixed upright post (211) but cannot rotate, the internal spline at the upper end in the second sliding sleeve (213) can be matched with the external spline at the lower end of the third upright post (214), and a second spring (212;

in an initial state, under the action of the elastic force of the second spring (212), the internal spline at the upper end of the second sliding sleeve (213) is always matched with the external spline at the lower end of the third upright post (214), so that the third upright post (214) is locked to rotate relative to the fixed upright post (211); when the third upright post (214) needs to be rotated, the second sliding sleeve (213) can be pressed downwards, so that the inner spline at the upper end of the second sliding sleeve is separated from the matching with the outer spline at the lower end of the third upright post (214), the third upright post (214) can be rotated to a proper angle, and then the pressing on the second sliding sleeve (213) is released, so that the inner spline at the upper end of the second sliding sleeve is matched with the outer spline at the lower end of the third upright post (214), and the position of the third upright post (214) is locked;

after the second sliding sleeve (213) is pressed downwards and the third upright post (214) is rotated by 180 degrees, the pressing on the second sliding sleeve (213) is released, so that the position of the third upright post (214) is locked, the first seat (1.1) and the second seat (1.2) can be changed from the front direction to the back direction, and the infant can be changed from the back to the parent-facing state;

the left ends of an upper connecting rod (209) and a lower connecting rod (208) form a revolute pair with a third upright post (214), the right ends of the upper connecting rod (209) and the lower connecting rod (208) form a revolute pair, the upper connecting rod (209) is installed on the upper side of the lower connecting rod (208), the upper connecting rod (209), the lower connecting rod (208), the second upright post (206) and the third upright post (214) form a parallelogram structure, the upper end of a pneumatic rod (210) forms a revolute pair with the upper connecting rod (209) through a top swing sleeve (218), the lower end of the pneumatic rod (210) forms a revolute pair with the lower connecting rod (208) through a tail swing sleeve (219), and a pneumatic rod switch (207) is installed at the top end of the pneumatic rod (210) and forms a revolute pair with the;

when the first seat (1.1) and the second seat (1.2) are in an unloaded state, the air pressure rod switch (207) is turned downwards to enable the air pressure rod (210) to extend, so that the position of the second upright post (206) is raised, and the first seat (1.1) and the second seat (1.2) are raised; when the air pressure rod switch (207) is turned downwards, the first upright post (203) is pressed downwards, the air pressure rod (210) can be contracted, the first seat (1.1) and the second seat (1.2) are lowered, the length of the air pressure rod (210) can be locked by releasing the air pressure rod switch (207), and the height positions of the first seat (1.1) and the second seat (1.2) can be locked.

8. The tandem multi-function stroller of claim 1, wherein: the chassis mechanism (3) comprises a bottom plate (301), a first elastic rod (302), a first upper connecting rod (303), a first lower connecting rod (304), a left rear leg rod (305), a left rear wheel (306), a right rear wheel (309), a right rear leg rod (310), a second lower connecting rod (311), a second upper connecting rod (312), a second elastic rod (313), a third elastic rod (314), a third upper connecting rod (315), a third lower connecting rod (316), a right front leg rod (317), a right front wheel (318), a fourth elastic rod (319), a fourth upper connecting rod (320), a fourth lower connecting rod (321), a left front leg rod (322), a left front wheel (323) and a brake mechanism, wherein the bottom plate (301) is a supporting body of the chassis mechanism (3), the left front wheel (323) is of a universal wheel structure, and the independent suspension is formed by the left front leg rod (322), the fourth lower connecting rod (321), the fourth upper connecting rod (320) and the fourth elastic rod (319), the right front wheel (318) is of a universal wheel structure and is independently suspended through a right front leg rod (317), a third lower connecting rod (316), a third upper connecting rod (315) and a third elastic rod (314), the left rear wheel (306) is provided with a brake mechanism and is independently suspended through a left rear leg rod (305), a first lower connecting rod (304), a first upper connecting rod (303) and a first elastic rod (302), and the right rear wheel (309) is provided with a brake mechanism and is independently suspended through a right rear leg rod (310), a second lower connecting rod (311), a second upper connecting rod (312) and a second elastic rod (313).

9. The tandem multi-function stroller of claim 8, wherein: the front end of the left front leg rod (322) and the upper end of the left front wheel (323) form a rotating pair, the rear end of the left front leg rod and the left side of the front end of the bottom plate (301) form a rotating pair, the rear end of the fourth upper connecting rod (320) and the left side of the front end of the bottom plate (301) form a rotating pair, the upper end of the fourth lower connecting rod (321) and the front end of the fourth upper connecting rod (320) form a rotating pair, the lower end of the fourth upper connecting rod and the left front leg rod (322) form a rotating pair, a spring is arranged in the fourth elastic rod (319), the rear end of the fourth elastic rod and the upper side of the bottom plate (301) form a rotating pair, and the front end of; the front end of the right front leg rod (317) and the upper end of the right front wheel (318) form a revolute pair, the rear end of the right front leg rod and the right side of the front end of the bottom plate (301) form a revolute pair, the rear end of the third upper connecting rod (315) and the right side of the front end of the bottom plate (301) form a revolute pair, the upper end of the third lower connecting rod (316) and the front end of the third upper connecting rod (315) form a revolute pair, the lower end of the third upper connecting rod and the right front leg rod (317) form a revolute pair, a spring is arranged in the third elastic rod (314), the rear end of the third elastic rod and the upper side of the bottom plate (301) form a revolute pair;

the front end of the left rear leg rod (305) and the left side of the rear end of the bottom plate (301) form a revolute pair, the upper side of the rear end of the left rear leg rod is provided with a brake frame (305.1), the lower side of the brake frame (305.1) is provided with a set of brake mechanism, the lower side of the rear end of the left rear leg rod (305) and a left rear wheel (306) form a revolute pair, the right side of the left rear wheel (306) is provided with a left brake disc (306.1), eighteen jacks are uniformly arranged on the circumference of the left brake disc (306.1), the brake mechanism can lock the left brake disc (306.1) so as to lock the rotation of the left rear wheel (306), the front end of the first upper connecting rod (303) and the left side of the rear end of the bottom plate (301) form a revolute pair, the upper, the lower end of the left spring rod and the left rear leg rod (305) form a rotating pair, the first spring rod (302) is internally provided with a spring, the front end of the upper connecting rod and the upper side of the bottom plate (301) form a revolute pair, and the rear end of the upper connecting rod and the rear end of the first upper connecting rod (303) form a revolute pair; the front end of the right rear leg rod (310) and the right side of the rear end of the bottom plate (301) form a revolute pair, the upper side of the rear end of the revolute pair is provided with a brake frame, the lower side of the brake frame is provided with a set of brake mechanism, the lower side of the rear end of the right rear leg rod (310) and the right rear wheel (309) form a revolute pair, the left side of the right rear wheel (309) is provided with a right brake disc, eighteen insertion holes are uniformly formed in the circumferential direction of the right brake disc, the brake mechanism can lock the right brake disc so as to lock the rotation of the right rear wheel (309), the front end of the second upper connecting rod (312) and the right side of the rear end of the bottom plate (301) form a revolute pair, the upper end of the second lower connecting rod (311) and the rear end of the second upper connecting rod (312) form a revolute pair, a spring is arranged in the second elastic rod (313), the front end of the second lower connecting rod and the.

10. The tandem multi-function stroller of claim 8, wherein: the brake mechanism comprises a brake releasing plate (307), a brake plate (308), a brake inserting rod (324), a brake spring (325), a sliding shaft (326), a sliding shaft spring (327), a brake shaft sleeve (328), a brake lower connecting rod (329), a brake upper connecting rod (330) and a rotating shaft (331), wherein the upper end of the brake shaft sleeve (328) is fixedly connected with a brake frame (305.1), the sliding shaft (326) is coaxially arranged inside the brake shaft sleeve (328) to form a moving pair, the sliding shaft spring (327) is arranged between the brake shaft sleeve and the sliding shaft spring, the brake inserting rod (324) is coaxially arranged at the lower end of the sliding shaft (326) to form a moving pair, the brake spring (325) is arranged between the brake releasing plate (307) and the brake shaft sleeve (328), the upper side of the right end and the brake shaft sleeve (328) form a rotating pair, the lower side of the right end and the left end of the brake lower connecting rod (329) form a rotating pair, the left end of the brake plate (308, the upper end of the brake upper connecting rod (330) and the lower side of the brake frame (305.1) form a rotating pair, and the lower end of the brake upper connecting rod, the right end of the brake lower connecting rod (329) and the right end of the brake plate (308) form a coaxial rotating pair through a rotating shaft (331);

when the brake mechanism is in an initial state, the brake mechanism is in a release state, the sliding shaft (326) is positioned at the uppermost position in the brake shaft sleeve (328) under the action of the elastic force of the sliding shaft spring (327), the brake inserted rod (324) is positioned at the lowermost position of the sliding shaft (326) under the action of the elastic force of the brake spring (325), the brake inserted rod (324) is not in contact with the left brake disc (306.1), at the moment, the left end of the brake plate (308) is positioned at the upper position, and the left end of the brake release plate (307) is positioned at the lower position;

when the left rear wheel (306) needs to be braked, the left end of the brake plate (308) is stepped downwards, the sliding shaft (326) moves downwards until the rotating shaft (331) contacts and abuts against the outer side face of the brake shaft sleeve (328), in the process, the brake inserted rod (324) is inserted into the insertion hole in the left brake disc (306.1), the left end of the brake releasing plate (307) moves to the upper position, and the brake process of the left rear wheel (306) is finished by releasing the brake plate (308) located at the lower position;

when the brake of the left rear wheel (306) needs to be released, the left end of a brake releasing plate (307) is stepped downwards, the rotating shaft (331) is pushed away from a brake shaft sleeve (328) through a brake lower connecting rod (329), the sliding shaft (326) is pushed to the uppermost end position under the action of the elastic force of a sliding shaft spring (327), then a brake inserting rod (324) is pulled away from an inserting hole of a left brake disc (306.1), the brake plate (308) moves from the low position to the high position, the brake releasing plate (307) moves to the low position, and the action of releasing the brake of the left rear wheel (306) is completed;

the braking principle and the brake release principle of the right rear wheel (309) are the same as those of the left rear wheel (306).