CN108974176B

CN108974176B - Adopt bionical mechanical structure to replace collapsible shopping cart of wheel

Info

Publication number: CN108974176B
Application number: CN201810978888.4A
Authority: CN
Inventors: 刘广博; 谭惠恩
Original assignee: Beijing Normal University
Current assignee: Beijing Normal University
Priority date: 2018-08-27
Filing date: 2018-08-27
Publication date: 2024-02-02
Anticipated expiration: 2038-08-27
Also published as: CN108974176A

Abstract

A foldable shopping cart adopting a bionic mechanical structure to replace wheels comprises the bionic mechanical structure and a shopping bag arranged on the bionic mechanical structure, wherein a front mechanical leg and a rear mechanical leg of the bionic mechanical structure are connected through a fixing frame, a crank is arranged between the front mechanical leg and the rear mechanical leg, and the front mechanical leg and the rear mechanical leg are driven to take steps in turn through crank rotation. The mechanical legs are in point contact with the ground, so that dependence on surrounding environments such as the ground is reduced, the mechanical legs can effectively pass through rugged road surfaces, the movement track of the mechanical legs can not change along with the change of terrains through the height and the width of a step distance, the shaking sense of the rugged ground on the hands in the pushing process can be reduced, the mechanical legs move more stably, the wrist burden can be relieved, articles can be placed without bending down frequently, the shopping bag can be detached from the bionic mechanical structure, and the bionic mechanical structure can be folded, so that the whole shopping cart can be folded, split and stored, and is convenient to carry.

Description

Adopt bionical mechanical structure to replace collapsible shopping cart of wheel

Technical Field

The invention relates to the technical field of machinery, in particular to a foldable shopping cart adopting a bionic mechanical structure to replace wheels.

Background

The beard monster of the "strandbase" developed by the netherlands engineer, the o Jansen, uses wind as kinetic energy to propel the whole machine forward by means of a mechanical transmission without any electric accessories such as motors. The successful development of the structure overturns the thinking mode that the walking robot must use electricity as a power source, and gets rid of the inherent form of relying on an electronic chip to control the movement. However, the bionic mechanical leg is huge, is not telescopic or foldable and is difficult to turn.

The shopping cart is designed by combining shopping bags or shopping baskets with wheels, and all points on the wheels of the shopping cart are in direct contact with the ground to form a line or surface contact form. When the ground is smooth, the shopping cart moves smoothly, when the ground is rugged, the household shopping cart can fluctuate along with the concave-convex of the road surface, so that when the shopping cart is pulled by a hand, the hand can have stronger shake feeling, and the hand comfort level is poor. In addition, most of household shopping carts are driven to move in a hand pulling mode, one end of each shopping cart with wheels is grounded, one end of each shopping cart with handrails acts on a hand, the shopping carts form an included angle of 30-60 degrees with the ground, the total gravity of the shopping carts and food materials generates a component force to act on the hand, the hand pulling type shopping carts can only disperse part of the component force, and the other part of the component force acts on the hand, so that the hand bearing is large, and the wrist burden is heavy.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides the foldable shopping cart adopting the bionic mechanical structure to replace wheels, which can reduce the thrust and the shaking sense of hands generated by uneven ground in the pushing process, can be more stable in movement, can reduce the wrist burden, can reduce the hand shaking, can place articles without bending down frequently, and can be folded and stored in the atmosphere of a modesty.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

the utility model provides an adopt bionical mechanical structure to replace collapsible shopping cart of wheel, includes bionical mechanical structure and set up in shopping bag on the bionical mechanical structure, bionical mechanical structure include the connecting rod and set up in the mechanical leg at connecting rod both ends, the connecting rod includes preceding connecting rod and back connecting rod, the shopping bag set up in preceding connecting rod with on the back connecting rod, preceding connecting rod with the both ends of back connecting rod are equipped with preceding mechanical leg and back mechanical leg respectively, preceding mechanical leg with back mechanical leg passes through the mount and connects, be equipped with the crank between preceding mechanical leg with the back mechanical leg, the crank passes the middle part of mount, through the rotation of crank drives preceding mechanical leg with the back mechanical leg takes a step forward in turn;

the structure of the front mechanical leg is the same as that of the rear mechanical leg, the front mechanical leg or/and the rear mechanical leg comprises a first movable part and a second movable part which are hinged to a crank, the other end of the first movable part, which is far away from the crank, is connected to a first parallel connecting part, a third movable part is hinged to the first parallel connecting part, one end of the third movable part, which is far away from the first parallel connecting part, is hinged to a fixed frame, a fourth movable part and a fifth movable part are also hinged to the fixed frame in parallel at the hinged position, one end of the fourth movable part, which is far away from the fixed frame, is connected to a second parallel connecting part, one end of the second movable part, which is far away from the crank, is connected to the second parallel connecting part, and the crank, the first movable part, the third movable part and the fixed frame form a first crank rocker mechanism;

the second parallel connecting piece is also hinged with a supporting leg, the middle part of the supporting leg is hinged with the second parallel connecting piece, one end of the supporting leg contacts the ground, the other end of the supporting leg is hinged with a sixth movable piece, one end of the sixth movable piece, which is far away from the supporting leg, is hinged with the fifth movable piece, the fourth movable piece, the fifth movable piece, the sixth movable piece and the supporting leg form a double-rocker mechanism, and the first crank-rocker mechanism and the second crank-rocker mechanism are driven to move through a crank to drive the double-rocker mechanism to move, so that the supporting leg is driven to move;

the first parallel connecting piece is further hinged with a sliding piece, the fifth movable piece is provided with a clamping groove, one end, far away from the first parallel connecting piece, of the sliding piece is buckled in the clamping groove, so that the angle between the third movable piece and the fifth movable piece is fixed, and when the sliding piece is separated from the clamping groove, the front mechanical leg or/and the rear mechanical leg is folded.

Further, two ends of the front connecting rod are respectively connected with two front mechanical legs which are arranged side by side, and two ends of the rear connecting rod are respectively connected with two rear mechanical legs which are arranged side by side.

Further, the mechanical legs at the two ends of the connecting rod are driven by two independent cranks, and the movement states of the mechanical legs at the two ends are the same or different, so that straight running or steering is realized.

Further, the connecting rod is arranged in a telescopic mode.

Further, the third movable piece, the fourth movable piece and one end of the fifth movable piece hinged with the fixed frame are provided with round heads, and the middle part of the second movable piece is arranged in an offset manner relative to the two ends of the second movable piece.

Further, the clamping groove is L-shaped, one side of the opening of the clamping groove is positioned at the bottom of the fifth movable piece, a buckle is arranged at the end part of the sliding piece, and the buckle slides into the clamping groove along the opening of the clamping groove.

Further, an included angle between the third movable piece and the fifth movable piece is 86 degrees.

Further, the hard objects are embedded on two sides of the shopping bag, the bottom of each hard object is provided with a clamping groove, and the clamping grooves are buckled on the front connecting rod and the rear connecting rod.

Further, a hard handle is arranged on the shopping bag or/and the hard paper object, and the hard handle can rotate 360.

Further, the hard handle is provided with a handrail, and the handrail is arranged in an arc shape and has a thickness larger than that of the hard handle.

The invention has the beneficial effects that:

the bionic mechanical structure is adopted to replace the original wheels of the shopping cart, the shopping bag is arranged on the bionic mechanical structure, the crank is utilized to drive the mechanical legs to swing forwards, only a person is required to apply force to the shopping bag slightly, the mechanical legs are in point contact with the ground, dependence on surrounding environments such as the ground is reduced, the road surface with rugged features can be effectively passed, the height and the width of the step distance are passed over the barrier, the movement track of the road surface with rugged features is not changed along with the change of the topography, the shaking feeling of the hands on the rugged ground in the pushing process can be reduced, and the road surface with rugged features can move more stably; the pushing force required by the movement of the shopping cart is small, so that the burden of the wrist can be reduced, and the hand shake feeling can be reduced; the height of the shopping cart accords with the principle of ergonomics, articles can be placed without bending down frequently, and the shopping cart is in modesty atmosphere; the shopping cart can be detached from the bionic mechanical structure, and the bionic mechanical structure can be folded, so that the whole shopping cart can be folded, detached and stored, and is convenient to carry.

Drawings

FIG. 1 is a schematic diagram of a foldable shopping cart employing a biomimetic mechanical structure instead of wheels in accordance with the present invention;

FIG. 2 is a top view of a foldable shopping cart employing bionic mechanical structure instead of wheels in accordance with the present invention;

FIG. 3 is a schematic view of the structure of the connecting rod in the foldable shopping cart of the present invention;

FIG. 4 is a schematic diagram of the track of the collapsible shopping cart of the present invention when turned;

FIG. 5 is a side view of a foldable shopping cart employing bionic mechanical structure instead of wheels in accordance with the present invention;

FIG. 6 is a schematic view of the structure of a single mechanical leg of the single-sided mechanical leg of the present invention;

FIG. 7 is a schematic view of a structure in which a sliding member is connected to a fifth movable member in a single-sided mechanical leg according to the present invention;

FIG. 8 is a schematic view of the leg of the mechanical leg of the present invention with an added I-shaped structure;

FIG. 9 is a schematic view of a leg bottom of a mechanical leg of the present invention configured as a semicircle;

FIG. 10 is a schematic view of the mechanical leg of the present invention without interfering with the second movable member during movement;

FIG. 11 is a schematic view of the movement process of a single-sided mechanical leg of the present invention;

FIG. 12 is a schematic view of the structure of a shopping bag in a foldable shopping cart using bionic mechanical structure instead of wheels in accordance with the present invention;

in the figure, a 1-bionic mechanical structure, a 2-front connecting rod, a 3-rear connecting rod, a 4-front mechanical leg, a 5-rear mechanical leg, a 6-fixing frame, a 7-crank, an 8-first movable part, a 9-second movable part, a 10-first parallel connecting part, an 11-third movable part, a 12-fourth movable part, a 13-fifth movable part, a 14-second parallel connecting part, a 15-supporting leg, a 16-sixth movable part, a 17-sliding part, an 18-buckle, a 19-clamping groove, a 20-round head, a 21-shopping bag, a 22-hard object, a 23-clamping groove, a 24-small groove, a 25-hard handle and a 24-handrail.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

As shown in fig. 1, the invention provides a foldable shopping cart adopting a bionic mechanical structure to replace wheels, which comprises a bionic mechanical structure 1 and a shopping bag 21 arranged on the bionic mechanical structure 1, wherein the shopping bag 21 can be detached from the bionic mechanical structure 1.

As shown in fig. 1 and 2, the bionic mechanical structure 1 comprises a connecting rod and mechanical legs arranged at two ends of the connecting rod, the connecting rod comprises a front connecting rod 2 and a rear connecting rod 3, a shopping bag 21 is arranged on the front connecting rod 2 and the rear connecting rod 3, two ends of the front connecting rod 2 and the rear connecting rod 3 are respectively provided with a front mechanical leg 4 and a rear mechanical leg 5, the front mechanical legs 4 and the rear mechanical legs 5 are connected through a fixing frame 6, a crank 7 is arranged between the front mechanical legs 5 and the rear mechanical legs 6, the middle part of the crank 7 penetrates through the middle part of the fixing frame 6, and the front mechanical legs 4 and the rear mechanical legs 5 are driven to take a step forward in turn through rotation of the crank 7.

As shown in fig. 2 and 3, in order to reduce the overall volume of the shopping cart and minimize the number of mechanical legs, 1-2 landing points are provided for walking of the mechanical legs on one side, and the minimum number of landing points is calculated to ensure that the whole mechanical leg structure can stably stand and walk, and at least 4 landing points are required, namely, 4 mechanical legs are required to be combined in parallel. In this embodiment, two ends of the front link 2 are respectively connected with two side-by-side front mechanical legs 4, and two ends of the rear link 3 are respectively connected with two side-by-side rear mechanical legs 5. As the shopping cart structure capable of bearing articles, the mechanical legs act as wheels to advance, and then 4 mechanical legs are fixed in parallel, and a place for placing articles is reserved in the middle. In order to allow the mechanical legs on the left and right sides to advance in parallel, the connecting rods 2 and 3 are needed in the middle, and the connecting rods 2 and 3 also serve as stress rods to support the weight of the article. The design of reducing the volume is initially returned, the middle parts of the connecting rods 2 and 3 are designed in a telescopic way, as shown in fig. 3, the connecting rods 2 and 3 are divided into three parts, the front part and the rear part are respectively arranged in two parallel mechanical legs to play a role in fixing, the diameters of the front part and the rear part are larger, the middle parts of the connecting rods can be accommodated, the diameters of the middle parts of the connecting rods 2 and 3 are smaller than those of the front part and the rear part of the connecting rods, the connecting rods 2 and 3 are embedded in the front part and the rear part of the connecting rods in telescopic way, and the volume of the whole mechanical structure can be shortened through telescopic arrangement of the connecting rods 2 and 3.

In order to make the shopping cart have a steering function, as shown in fig. 2 and fig. 4, the mechanical legs at two ends of the connecting rod are driven by two independent cranks 7, the constraint of the cranks on the mechanical legs at two ends is eliminated, each independent crank 7 only acts on the mechanical legs at the same side, so that the mechanical legs at two ends have the same or different motion states, and keep straight movement when the two motion states are the same, and when the shopping cart needs to be steered, the steering purpose is achieved by utilizing the principle of differential rotation around the same circle center and generating speed difference in the mechanical legs at two sides.

As shown in fig. 5 to 7, the single-sided mechanical leg includes a front mechanical leg 4 and a rear mechanical leg 5, which are identical in structure and are symmetrically disposed with respect to the crank 7. The front mechanical leg 4 and the rear mechanical leg 5 are connected through a fixing frame 6, the middle part of a crank 7 penetrates through the middle part of the fixing frame 6 and can rotate relative to the fixing frame 6, the front mechanical leg 4 and/or the rear mechanical leg 5 comprise a first movable part 8 and a second movable part 9 which are hinged to the crank 7, the other end of the first movable part 8, which is far away from the crank 7, is connected to a first parallel connecting part 10, a third movable part 11 and a sliding part 17 are hinged to the first parallel connecting part 10, one end of the third movable part 11, which is far away from the first parallel connecting part 10, is hinged to the fixing frame 6, a fourth movable part 12 and a fifth movable part 13 are hinged to the fixing frame 6 in parallel at the hinged position, one end of the fourth movable part 12, which is far away from the fixing frame 6, is connected to a second parallel connecting part 14, and one end of the second movable part 9, which is far away from the crank 7, is connected to the second parallel connecting part 14, and the crank 7, the first movable part 8, the third movable part 11 and the fixing frame 6 form a first crank rocker mechanism, and the crank 7, the second movable part 9, the fourth movable part 12 and the fixing frame 6 form a second crank rocker mechanism.

The second parallel connecting piece 14 is also hinged with a supporting leg 15, the supporting leg 15 is L-shaped, the middle part of the supporting leg 15 is hinged with the second parallel connecting piece 14, one end of the supporting leg 15 contacts the ground, the other end of the supporting leg is hinged with a sixth movable piece 16, one end of the sixth movable piece 16, which is far away from the supporting leg 15, is hinged with a fifth movable piece 13, the fourth movable piece 12, the fifth movable piece 13, the sixth movable piece 16 and the supporting leg 15 form a double-rocker mechanism, and the first crank-rocker mechanism and the second crank-rocker mechanism are driven to move through a crank 7 to drive the double-rocker mechanism to move, so that the supporting leg 15 is driven to move, and the supporting leg 15 is enabled to walk forwards. By the first parallel connection member 10 and the second parallel connection member 14, two-dimensional to three-dimensional transition can be realized, so that the motions of the first crank-rocker mechanism, the second crank-rocker mechanism and the double-rocker mechanism are not in the same plane, and interference is avoided.

The first parallel connecting piece 10 is further hinged with a sliding piece 17, the fifth movable piece 13 is provided with a clamping groove 19, one end, far away from the first parallel connecting piece 10, of the sliding piece 17 is provided with a clamping buckle 18, the clamping buckle 18 is clamped in the clamping groove 19 to fix the angle between the third movable piece 11 and the fifth movable piece 13, and when the sliding piece 17 is separated from the clamping groove 19, the front mechanical leg 4 or/and the rear mechanical leg 5 can be folded. In this embodiment, the clamping groove 19 is L-shaped, one side of the opening of the clamping groove is located at the bottom of the fifth movable element 13, the end of the sliding element 17 is provided with the buckle 18, and the buckle 18 slides into and is fixed in the clamping groove 19 along the opening of the clamping groove 19, so that the third movable element 11 and the fifth movable element 13 keep an included angle of 86 degrees when the shopping cart walks.

The included angle between the third movable part 11 and the fifth movable part 13 of the component is 86 degrees, and the length 231.53 mm of the accurate sliding part 17 is measured. When assembled, the fifth movable member 13 is used as a sliding guide rail, and the sliding member 17 slides into the clamping groove 19 along the sliding guide rail, and the clamping groove 19 fixes the fifth movable member. When the fifth movable element 13 is removed, the fifth movable element 13 is lifted upward to separate the engaging groove 19 from the slider 17, and the slider 17, the fifth movable element 13, the sixth movable element 16, the leg 15, and the like naturally hang down due to their own weight. The sliding piece 17 is always in the double-rocker mechanism, the movement amplitude is limited by the fourth movable piece 12, dislocation can not occur, and the control is easy.

As shown in fig. 8 and 9, the supporting leg 15 is grounded, so that the leg 15 is semi-circular in design to reduce friction, and a silica gel cushion can be added to wrap the grounding end to buffer pressure if necessary. The area of the changed part is reduced by 1/3 of the original area, and the stress capacity of the leg is weakened, so that the grounding end adopts an I-shaped structural design, the bending resistance is enhanced, and the bearing capacity is increased.

Referring to fig. 10, in the embodiment of the present invention, the sheet-shaped strips with a thickness of 4 mm, a width of 15 mm and a length of unequal are used for assembly, wherein the third movable member 11, the fourth movable member 12 and the fifth movable member 13 are connected with the fixed frame 6, and belong to a member with larger stress, and the member assembly hole is the same as the assembly hole of the fixed frame 6 and is 6 mm, therefore, one end of the third movable member 11, the fourth movable member 12 and the fifth movable member 13 hinged with the fixed frame 6 is provided with a round head 20, and the diameter of the round head 20 is 21 mm, so as to increase the stress range. Due to the fact that the round head 20 is additionally arranged, interference can occur between the second movable piece 9 and the round head 20 in the moving process, and the model cannot operate, so that the second movable piece 9 is improved, the middle of the improved second movable piece 9 is arranged in an offset mode relative to the two ends of the second movable piece, movable spaces are reserved for the third movable piece 11, the fourth movable piece 12 and the fifth movable piece 13, and the model can operate smoothly and cannot interfere.

As shown in fig. 11, which is a schematic diagram of a movement process of a single-side mechanical leg, it can be seen from the diagram that the supporting leg 15 of the bionic mechanical structure 1 is in point contact with the ground, unlike a surface contact form of a wheel type structure and the ground, dependence on surrounding environments such as the ground can be reduced. The motion of the legs 15 of the bionic mechanical structure 1 is a ground-contacting-rising-returning-descending-ground-contacting process, and can effectively pass through rugged road surfaces and pass through obstacles by the height and width of the step distance. Different from the wheel axle, the movement track of the mechanical leg is in a certain concave-convex range on the ground, and can not be changed along with the change of the terrain, so that the movement is more stable.

As shown in fig. 1, 5 and 12, the shopping cart and the shopping bag 21 are detachably designed. When the shopping cart is combined with the shopping bag, the shopping cart can be used as a side pushing cart; when the shopping bag 21 is detached, the shopping bag can be used independently, and the shopping cart can be folded for placement, so that the use function of the product is improved. The telescopic connecting rod can bear the weight of articles, and a space for placing the articles is reserved between the mechanical legs at two sides. Therefore, the shopping bag 21 is designed in a predetermined space by using the front link 2 and the rear link 3 as force receiving devices. The hard objects 22 are embedded on two sides of the shopping bag 21, the shopping bag 21 is fixed so that the shape of the shopping bag cannot be deformed, the bottom of the hard objects 22 is provided with the clamping grooves 23, and the clamping grooves 23 are clamped on the front connecting rod 2 and the rear connecting rod 3. As shown in fig. 3, the two ends of the middle parts of the connecting rods 2 and 3 are provided with small grooves 24 for fixing two sides of the shopping bag 21, so that the whole bag is supported and fixed and cannot slide along the connecting rods, the sagging deformation degree of the bottom of the bag caused by the weight of articles in the using process can be reduced, the situation that two sides of the bag are close to each other in the middle is also reduced, the bag does not need to be pulled out by hands in the using process, and the shopping bag is more convenient. In other embodiments, the structure of the shopping bag 21 can be designed in various ways as desired, increasing aesthetics and ease of use.

As shown in fig. 5 and 12, the shopping cart is moved forward and backward or turned by pushing force of a user, and no special handle is arranged on the shopping cart for the user to use, and instead, a hard handle 25 connected with the shopping bag 21 is used, so long as the force is applied to the shopping bag 21, the shopping bag 21 can drive the shopping cart to move forward. This force may pull the shopping bag 21 through a rigid handle 25 on the shopping bag 21, the shopping bag 21 pulling the cart to effect movement. The hard handle 25 on the shopping bag 21 can rotate 360 degrees, can adapt to various torsion angles of the wrist and can slow down the abrasion of the wrist bone. The handle 25 is provided with the armrest 26, the armrest 26 has a certain curvature and thickness, the armrest 26 is arranged in an arc shape, the thickness is larger than that of the handle 25, the contact area between the palm and the armrest 26 can be increased, and the pressure intensity is reduced. The height between the armrest 26 and the ground in the shopping bag 21 during use is 820.47 mm. According to ergonomic design rules: the height of the elbows of the men and women is 889-1118 mm from the ground, and studies show that the most comfortable height of the working surface for standing use is 76 mm below the joints of the elbows of the people, and analysis shows that the height of the armrests 26 of the shopping bag 21 from the ground is 813-1042 mm, so that the height between the armrests 26 and the ground is 820.47 mm, which is in accordance with the ergonomic principle. Increasing the height of the shopping bag 21 effectively reduces the degree of flexure necessary to the waist when items are placed on the shopping cart to reduce the pressure on the waist. The lowermost portion of the shopping bag 21 is 339.92 mm from the floor and the height of the tabs is approximately 586.45 mm, so that items can be placed without having to bend down, and smaller or shorter items can be placed with a slight bend down. The pocket mouth of the shopping bag 21 is designed to be open, and is changed from a traditional vertical shopping cart into a longitudinal shopping cart, so that the gravity center of the shopping cart is increased, the visible area is increased, and the purchased articles are apparent.

The target crowd of the shopping cart is women going to farmer market for shopping, the whole volume of the shopping cart is larger than that of a general household shopping cart, and the large-volume objects can bring the feeling of vigour and non-negligible feeling to people. The shopping cart brings a sense of manor to people, so that consumers bring a sense of ceremony in the process of purchasing food materials, consider that the consumers come to the farmer market with an important and Shensheng task, and carefully and actively see the activity of purchasing the food materials, but not a living burden. The appearance of the shopping cart redefines activities of daily living, so that consumers can better understand and respect the living and enjoy the living.

The shopping cart is applied to the whole process of going to and coming from the farmer market and purchasing food materials in the farmer market, and the application prospect comprises the following steps: (1) walk-forward to farmer market: before the shopping cart is taken out, the assembly of the shopping cart is completed, the shopping cart is moved to the farmer market by the hand-held hand-pushed cart, food materials are purchased and placed in the shopping bag, the hand-held hand-pushed cart returns home by the hand-held hand-pushed cart, the shopping bag is lifted to arrange the food materials, and the shopping cart is folded and stored. (2) use of public transport to farmer market: before the shopping bag is taken out of the door, the shopping bag is assembled, the shopping bag is lifted to arrange the food materials in the home repeatedly, and the shopping bag is folded and stored. (3) private car travel instead of walk to farmer market: the folding shopping cart can be placed in the trunk for a long time, the cart is driven to the farmer market, the shopping cart is assembled after the cart is taken off, food materials are purchased and placed in the shopping bag, the shopping bag is lifted to place the trunk, the mechanical leg part of the folding shopping cart is placed in the trunk, the cart is driven to return home, the shopping bag is lifted to arrange the food materials, the mechanical leg part can not be taken out, and the shopping bag can be placed in the trunk for standby after the food materials are taken out.

In consideration of cost and weight, the bionic mechanical leg is made of plastic materials, and analysis results show that ABS performance is between engineering plastics and general plastics, heat resistance and mechanical energy are inferior to those of engineering plastics, and the bionic mechanical leg has good mechanical energy, is easy to form and process, has high surface hardness, and is suitable for machining and production of mechanical legs. The hard objects, hard handles and handrails on two sides of the shopping bag are made of ABS materials, the shopping bag is required to be waterproof and tear-proof, the shopping bag on a general shopping cart is made of oxford, and the oxford has the characteristics of being firm, wear-resistant, durable, waterproof, strong in bearing and capable of being freely configured in color, and the shopping bag is sewn by the oxford materials in the embodiment.

According to the invention, the bionic mechanical structure 1 is adopted to replace the original wheels of the shopping cart, the shopping bag 21 is arranged on the bionic mechanical structure 1, the crank 7 is utilized to drive the mechanical legs to step forward, only a person is required to apply force to the shopping bag, the mechanical legs are in point contact with the ground, dependence on the surrounding environment such as the ground is reduced, the road surface can be effectively passed through rugged road surfaces, the moving track of the road surface can not be changed along with the change of the topography through the height and width of the step, the shaking feeling of the rugged ground on the hands in the pushing process can be reduced, and the road surface can move more stably; the pushing force required by the movement of the shopping cart is small, so that the burden of the wrist can be reduced, and the hand shake feeling can be reduced; the height of the shopping cart accords with the principle of ergonomics, articles can be placed without bending down frequently, and the shopping cart is in modesty atmosphere; the shopping cart can be detached from the bionic mechanical structure, and the bionic mechanical structure can be folded, so that the whole shopping cart can be folded, detached and stored, and is convenient to carry.

While the invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents substituted for elements thereof without departing from the spirit and scope of the invention, which is intended to be covered by the claims below.

Claims

1. A foldable shopping cart employing a biomimetic mechanical structure instead of wheels, comprising: the bionic mechanical structure comprises a connecting rod and mechanical legs arranged at two ends of the connecting rod, the connecting rod comprises a front connecting rod and a rear connecting rod, the shopping bag is arranged on the front connecting rod and the rear connecting rod, the two ends of the front connecting rod and the rear connecting rod are respectively provided with a front mechanical leg and a rear mechanical leg, the front mechanical legs and the rear mechanical legs are connected through a fixing frame, a crank is arranged between the front mechanical legs and the rear mechanical legs, the crank penetrates through the middle of the fixing frame, and the front mechanical legs and the rear mechanical legs are driven to take steps in turn through rotation of the crank;

2. The foldable shopping cart of claim 1 employing a biomimetic mechanical structure in place of wheels, wherein: two ends of the front connecting rod are respectively connected with two front mechanical legs which are arranged side by side, and two ends of the rear connecting rod are respectively connected with two rear mechanical legs which are arranged side by side.

3. The foldable shopping cart of claim 1 employing a biomimetic mechanical structure in place of wheels, wherein: the mechanical legs at the two ends of the connecting rod are driven by two independent cranks, and the movement states of the mechanical legs at the two ends are the same or different so as to realize straight running or steering.

4. The foldable shopping cart of claim 1 employing a biomimetic mechanical structure in place of wheels, wherein: the connecting rod is arranged in a telescopic way.

5. The foldable shopping cart of claim 1 employing a biomimetic mechanical structure in place of wheels, wherein: the third movable piece, the fourth movable piece and one end of the fifth movable piece, which is hinged with the fixed frame, are provided with round heads, and the middle part of the second movable piece is arranged in an offset manner relative to the two ends of the second movable piece.

6. The foldable shopping cart of claim 1 employing a biomimetic mechanical structure in place of wheels, wherein: the clamping groove is L-shaped, one side of the opening of the clamping groove is positioned at the bottom of the fifth movable piece, a buckle is arranged at the end part of the sliding piece, and the buckle slides into the clamping groove along the opening of the clamping groove.

7. The foldable shopping cart of claim 1 employing a biomimetic mechanical structure in place of wheels, wherein: the included angle between the third movable piece and the fifth movable piece is 86 degrees.

8. The foldable shopping cart of claim 1 employing a biomimetic mechanical structure in place of wheels, wherein: the shopping bag is characterized in that hard objects are embedded on two sides of the shopping bag, a clamping groove is formed in the bottom of each hard object, and the clamping grooves are buckled on the front connecting rod and the rear connecting rod.

9. The foldable shopping cart of claim 8 employing a biomimetic mechanical structure in place of wheels, wherein: the shopping bag or/and the hard object is provided with a hard handle, and the hard handle can rotate 360.

10. The foldable shopping cart of claim 9 employing a biomimetic mechanical structure in place of wheels, wherein: the hard handle is provided with a handrail, and the handrail is arranged in an arc shape and has a thickness larger than that of the hard handle.