Vehicle front wheel fixing device

Abstract

The utility model relates to the technical field of vehicle parking devices, in particular to a vehicle front wheel fixing device which comprises a parking frame, a front wheel sliding seat and a front wheel fixing mechanism. The front wheel fixing mechanism comprises a front wheel fixing part and a front wheel overturning part; the front wheel overturning part overturns forwards and backwards in the direction of the front wheel fixing part; and a front wheel accommodating groove for fixing a front wheel of the vehicle is formed between the front wheel fixing part and the front wheel overturning part. According to the vehicle front wheel fixing device, after the front wheels of the vehicle are fixed to the front wheel fixing mechanism, a user only needs to apply forward thrust to the vehicle at the rear end of the vehicle, and then the front wheel fixing mechanism can drive the vehicle to move along the parking frame along with the front wheel sliding seat until the vehicle is completely parked in the parking frame; the problems that in the prior art, a user needs to walk to the front end of a parking space to lock a front wheel of a vehicle, a space for the user to advance needs to be reserved for arrangement of a single parking space, the width needed by the single parking space is large, and the space utilization rate is low are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle parking device technical field, especially in a kind of vehicle front wheel fixing device. BACKGROUND

[0002] With the increase of double-wheeled electric vehicles and shared bicycles, the existing number of parking spaces is difficult to meet daily needs, and the problem of random parking of vehicles also appears, especially in urban core areas, prosperous business circles, hospitals and other places. In the prior art, parking garages are generally planned and set in prosperous areas to park double-wheeled electric vehicles or shared bicycles, and independent parking spaces are provided in the parking garage to solve the problems of parking difficulty and random parking.

[0003] However, the existing parking spaces generally only have a device for fixing the front wheels of the vehicle fixed at the front end of the parking space. During parking, the user needs to follow the vehicle forward at the side of the parking space and needs to walk to the front end of the parking space to lock the front wheels of the vehicle. The parking process is troublesome, and the user is likely to knock down the vehicle parked next to him during walking. In addition, the space for the user to walk forward needs to be reserved for the single parking space, resulting in a larger width required for a single parking space and low space utilization. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a vehicle front wheel fixing device. After the front wheels of the vehicle are fixed on the front wheel fixing mechanism, the user only needs to apply a forward pushing force to the vehicle at the rear end of the vehicle, so that the front wheel fixing mechanism drives the vehicle to move along the parking frame with the front wheel sliding seat, until the vehicle is completely parked in the parking frame. During parking, the user does not need to follow the vehicle forward, solving the problem in the prior art that the user needs to walk to the front end of the parking space to lock the front wheels of the vehicle, and the space for the user to walk forward needs to be reserved for the single parking space, resulting in a larger width required for a single parking space and low space utilization.

[0005] To achieve the above purpose, the utility model provides a vehicle front wheel fixing device, which comprises a parking frame, a front wheel sliding seat and a front wheel fixing mechanism. The parking frame comprises a frame body, and the frame body is provided with a mounting cavity. The front wheel sliding seat is slidingly arranged in the mounting cavity and slides along the frame body forward and backward. The front wheel fixing mechanism comprises a front wheel fixing part and a front wheel turnover part. The front wheel fixing part is connected to the front end of the front wheel sliding seat, and the front wheel turnover part is rotationally connected to the rear end of the front wheel sliding seat. The front wheel turnover part turns forward and backward towards the front wheel fixing part. The front wheel fixing part and the front wheel turnover part form a front wheel containing groove for fixing the front wheels of the vehicle.

[0006] Optionally, the front wheel fixing part comprises a fixing seat and a front stop part; the fixing seat is connected to the front end of the front wheel sliding base, the front stop part is fixedly connected to the front end of the fixing seat, the front wheel turnover part is rotationally connected to the rear end of the fixing seat, and the front wheel turnover part is flipped forward and backward towards the direction of the front stop part; the upper end of the front stop part is open; the fixing seat, the front stop part and the front wheel turnover part enclose to form the front wheel containing groove.

[0007] Optionally, the front stop part comprises a front stop bottom plate, a front stop vertical plate and a front stop side plate; one end of the front stop bottom plate is fixedly connected to the end of the fixing seat away from the front wheel turnover part, the other end of the front stop bottom plate is fixedly connected to the front stop vertical plate, and the front stop vertical plate is fixedly connected to the upper end surface of the front stop bottom plate; the left and right ends of the front stop bottom plate are respectively connected with the front stop side plates, and the left and right ends of the front stop vertical plate are respectively fixedly connected with the front stop side plates; the front stop bottom plate, the front stop vertical plate and the two front stop side plates enclose to form a first limiting space, and the first limiting space is in communication with the front wheel containing groove, so that the front part of the front wheel is limited in the first limiting space.

[0008] Optionally, the fixing seat comprises a first bottom plate, a second bottom plate and a first side plate; the first bottom plate, the second bottom plate and the front stop bottom plate are connected in sequence along the advancing direction of the front wheel sliding base, and the first side plate is connected to the left and right sides of the first bottom plate and the second bottom plate; and the front stop vertical plate is located at the end of the front stop bottom plate away from the second bottom plate; the second bottom plate is arranged upwardly inclined to the direction of the front stop bottom plate, the first bottom plate is arranged downwardly inclined to the direction of the second bottom plate, and the included angle between the first bottom plate and the horizontal ground is smaller than the included angle between the second bottom plate and the horizontal ground.

[0009] Optionally, the front stop part further comprises an arc-shaped plate and a fixed side plate arranged in the first limiting space; the left and right sides of the arc-shaped plate are respectively connected with the fixed side plates, one end of the arc-shaped plate is fixedly connected to the upper end of the front stop vertical plate, the other end of the arc-shaped plate is fixedly connected to the upper end surface of the second bottom plate, and the bottom surface of the arc-shaped plate is tangent to the second bottom plate; the ends of the two fixed side plates away from each other are respectively fixedly connected with the front stop side plates; the arc-shaped plate and the two fixed side plates enclose to form a second limiting space, and the second limiting space is in communication with the front wheel containing groove, so that the front part of the front wheel is limited in the second limiting space.

[0010] Optionally, the front wheel turnover part comprises a first turnover part, a second turnover part and a first rotating shaft part; the first turnover part comprises a first turnover bottom plate, the second turnover part comprises a second turnover bottom plate, and the first turnover bottom plate and the second turnover bottom plate are connected in a V shape; the first rotating shaft part comprises a first sleeve and a first rotating shaft, the first sleeve is fixedly connected between the first turnover bottom plate and the second turnover bottom plate, and the two ends of the first rotating shaft are respectively fixedly connected to the rear end of the fixed seat, and the first sleeve is sleeved on the outer periphery of the first rotating shaft, and the first sleeve is rotationally connected with the first rotating shaft.

[0011] Optionally, the first turnover part further comprises a first turnover side plate, the left and right ends of the first turnover bottom plate are respectively connected with the first turnover side plate, and a first through groove is formed between the first turnover bottom plate and the first turnover side plate; one side of the first turnover side plate close to the second turnover part is an inclined side; the second turnover part further comprises a second turnover side plate, the left and right ends of the second turnover bottom plate are respectively connected with the second turnover side plate, and a second through groove is formed between the second turnover bottom plate and the second turnover side plate; the first through groove and the second through groove are in communication with each other; the first turnover side plate is fixedly connected with the second turnover side plate on the same side, the structure of the second turnover side plate is the same as that of the first turnover side plate, and the second turnover side plate and the first turnover side plate are symmetrically arranged relative to the first rotating shaft part.

[0012] Optionally, the front wheel turnover part further comprises a locking rod, the locking rod is fixedly arranged on the bottom surface of the first turnover part, and the two ends of the locking rod respectively extend above the left and right side walls of the vehicle frame body; the upper ends of the left and right side walls of the parking frame are respectively provided with a locking block, the left and right ends of the locking rod are respectively located at the rear end of the corresponding locking block, and the highest point of the upper end surface of the locking block is located higher than the horizontal position of the bottom end surface of the locking rod.

[0013] Optionally, the upper end surface of the locking block is provided with a first guide inclined surface, and the first guide inclined surface is arranged to be inclined downward along the advancing direction of the front wheel sliding seat.

[0014] Optionally, the left and right ends of the vehicle frame body are provided with a moving sliding groove, and the moving sliding groove is in communication with the mounting cavity; the left and right ends of the front wheel sliding seat are respectively provided with a roller, the axis of the roller is parallel to the horizontal ground, and the roller is slidingly connected with the vehicle frame body in the moving sliding groove; the left and right ends of the front wheel sliding seat are further respectively provided with a guide wheel, the axis of the guide wheel is perpendicular to the horizontal ground, the guide wheel is slidingly connected with the vehicle frame body in the moving sliding groove, and the guide wheel abuts against the inner side wall surface of the vehicle frame body.

[0015] Compared with the prior art, the utility model has the advantages of the following:

[0016] Through setting up the front wheel sliding seat, and making the front wheel fixing mechanism be connected with the front wheel sliding seat, when the front wheel sliding seat slides along the car body front and back, the front wheel fixing mechanism can also slide along the car body front and back, when parking, the user makes the front wheel of the vehicle press the front wheel turnover part, makes the front wheel turnover part overturn to the direction of the front wheel fixing part, the front and back ends of the front wheel respectively abut with the front wheel fixing part and the front wheel turnover part through the dead weight of the front wheel pressing the front wheel turnover part, can lock the front wheel in the front wheel containing groove, then the user only needs to apply the forward thrust to the vehicle at the rear end of the vehicle, can make the vehicle follow the front wheel sliding seat and move forward until the vehicle is completely parked in the parking frame, the parking process is more convenient and fast, and the vehicle beside is not easy to knock down. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is structure schematic diagram of vehicle front wheel fixing device of an embodiment of the utility model;

[0018] Figure 2 It is structure schematic diagram of front wheel fixing mechanism of vehicle front wheel fixing device of an embodiment of the utility model (the state schematic diagram of after overturning of front wheel turnover part);

[0019] Figure 3 It is structure schematic diagram of front wheel sliding seat, front wheel fixing mechanism and push car platform of vehicle front wheel fixing device of an embodiment of the utility model;

[0020] Figure 4 It is structure schematic diagram of front wheel fixing mechanism of vehicle front wheel fixing device of another embodiment of the utility model (the state schematic diagram of after overturning of front wheel turnover part);

[0021] Figure 5 It is structure schematic diagram of vehicle front wheel fixing device of another embodiment of the utility model; Figure 1 It is enlarged schematic diagram of A in;

[0022] Figure 6 It is structure schematic diagram of vehicle front wheel fixing device of another embodiment of the utility model;

[0023] Figure 7 It is local structure schematic diagram of vehicle front wheel fixing device of another embodiment of the utility model;

[0024] Figure 8 The front wheel sliding seat, the front wheel fixing mechanism and the stroller platform of the vehicle front wheel fixing device of another embodiment of the utility model are shown in the sectional view;

[0025] Figure 9 For Figure 8 The enlarged schematic view at B;

[0026] Figure 10 The top view of the vehicle front wheel fixing device of another embodiment of the utility model is shown.

[0027] The parking frame 1, the frame body 11, the mounting cavity 111, the moving sliding groove 112, the locking block 113, the first guide inclined surface 1131, the steering rail 12, the straight line segment 121, the oblique line segment 122, the extension segment 123, the front wheel sliding seat 2, the roller 21, the guide wheel 22, the sliding seat body 23, the guide hole 231, the convex column 24, the rotating cavity 241, the rotating bearing 25, the front wheel fixing mechanism 3, the front wheel fixing part 31, the fixing seat 311, the first bottom plate 3111, the second bottom plate 3112, the first side plate 3113, the front blocking part 312, the front blocking bottom plate 3121, the front blocking vertical plate 3122, the front blocking side plate 3123, the first limiting space 3124, the arc-shaped plate 3125, the fixing side plate 3126, the second limiting space 3127, the steering shaft 313, the guide column 314, the steel ball 3141, the front wheel overturning part 32, the first overturning part 321, the first overturning bottom plate 3211, the first overturning side plate 3212, the first through groove 3213, the oblique blocking plate 3214, the second overturning part 322, the second overturning bottom plate 3221, the second overturning side plate 3222, the second through groove 3223, the first rotating shaft part 323, the first sleeve 3231, the first rotating shaft 3232, the locking rod 324, the front wheel containing groove 33, the stroller platform 4, the platform body 41, the stroller inclined surface 411, the buffer pad 42. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0029] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directionality indications also change accordingly.

[0030] In the utility model, unless another explicit provision and limitation, the terms "connect", "fix" and the like should be broad sense understanding, for example, "fix" can be fixed connection, also can be detachable connection, or be integrated, can be mechanical connection, also can be electrical connection, can be directly connected, also can be indirectly connected through the intermediate medium, can be two element internal communication or two element mutual action relation, unless another explicit limitation. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0031] In addition, in the utility model, the description such as "first", "second" is only for the purpose of description, and can not be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel schemes, for example, "A and / or B", including A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on that ordinary skilled in the art can realize, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0032] Please refer to Figure 1 And Figure 2 To solve the above technical problems, the utility model provides a vehicle front wheel fixing device, it includes: parking frame 1, front wheel sliding seat 2 and front wheel fixing mechanism 3;

[0033] The parking frame 1 includes frame body 11 ， The frame body 11 is equipped with installation cavity 111;

[0034] The front wheel sliding seat 2 is slidably arranged in the installation cavity 111, and the front wheel sliding seat 2 slides along the frame body 11 forwards and backwards;

[0035] The front wheel fixing mechanism 3 includes front wheel fixing part 31 and front wheel turnover part 32;The front wheel fixing part 31 is connected to the front end of the front wheel sliding seat 2, and the front wheel turnover part 32 is rotatably connected to the rear end of the front wheel sliding seat 2;The front wheel turnover part 32 flips forwards and backwards towards the direction of the front wheel fixing part 31;The front wheel fixing part 31 and the front wheel turnover part 32 form a front wheel containing groove 33 for fixing the front wheel.

[0036] By setting the front wheel sliding seat 2, and connecting the front wheel fixing mechanism 3 with the front wheel sliding seat 2, when the front wheel sliding seat 2 slides along the frame body 11 forward and backward, the front wheel fixing mechanism 3 is also driven to slide along the frame body 11 forward and backward; when parking, the user presses the front wheel of the vehicle over the front wheel turnover part 32, so that the front wheel turnover part 32 is turned over forward to the direction of the front wheel fixing part 31, and the front and rear ends of the front wheel are respectively abutted with the front wheel fixing part 31 and the front wheel turnover part 32 by the self-weight of the front wheel, so that the front wheel is locked in the front wheel containing groove 33, then the user only needs to apply a forward pushing force to the rear end of the vehicle, so that the vehicle moves forward along with the front wheel sliding seat 2 until the vehicle is completely parked in the parking frame, the parking process is more convenient and fast, and the vehicle beside is not easy to be knocked down.

[0037] The front wheel fixing device of the utility model, when parking, the user does not need to advance along with the vehicle, solves the problem that in the prior art, the user needs to walk to the front end of the parking space to lock the front wheel of the vehicle, and the single parking space also needs to reserve space for the user to advance, thereby resulting in that the width of the single parking space is large and the space utilization rate is low.

[0038] Please refer to Figure 2 Further, the front wheel fixing part 31 comprises a fixing seat 311 and a front blocking part 312; the fixing seat 311 is connected to the front end of the front wheel sliding seat 2, the front blocking part 312 is fixedly connected to the front end of the fixing seat 311, and the front wheel turnover part 32 is rotationally connected to the rear end of the fixing seat 311, and the front wheel turnover part 32 is turned over forward and backward to the direction of the front blocking part 312.

[0039] The upper end of the front blocking part 312 is open; the fixing seat 311, the front blocking part 312 and the front wheel turnover part 32 form the front wheel containing groove 33.

[0040] By setting the fixing seat 311 and the front blocking part 312, and the fixing seat 311, the front blocking part 312 and the front wheel turnover part 32 form the front wheel containing groove 33, when parking, the front wheel of the vehicle is fixed in the front wheel containing groove 33, so that the vehicle is not easy to be tilted during advancing, and the front blocking part 312 can be used to block the front wheel of the vehicle from moving forward, thereby realizing that the user does not need to advance along with the vehicle when parking, the front wheel fixing device of the vehicle does not need to reserve space for the user to advance, the width of the single parking space is reduced, and the space utilization rate is improved.

[0041] Please refer to Figure 2Further, the front stop portion 312 includes a front stop bottom plate 3121, a front stop vertical plate 3122 and a front stop side plate 3123.

[0042] One end of the front stop bottom plate 3121 is fixedly connected to one end of the fixing seat 311 away from the front wheel turnover portion 32, the other end of the front stop bottom plate 3121 is fixedly connected to the front stop vertical plate 3122, and the front stop vertical plate 3122 is fixedly connected to the upper end surface of the front stop bottom plate 3121. The left and right ends of the front stop bottom plate 3121 are respectively connected to the front stop side plates 3123, and the front stop side plates 3123 are respectively fixedly connected to the left and right ends of the front stop vertical plate 3122.

[0043] The front stop bottom plate 3121, the front stop vertical plate 3122 and the front stop side plates 3123 form a first limiting space 3124, and the first limiting space 3124 is in communication with the front wheel containing groove 33, so that the front part of the front wheel is limited in the first limiting space 3124.

[0044] By arranging the first limiting space 3124, the front part of the front wheel is limited in the first limiting space 3124 during the forward movement of the vehicle, so that the vehicle is not easy to fall during the forward movement. The front stop vertical plate 3122 can prevent the front wheel from moving forward, and the front stop side plates 3123 can prevent the front wheel from moving in the left and right directions.

[0045] Please refer to Figure 2 Further, the fixing seat 311 includes a first bottom plate 3111, a second bottom plate 3112 and a first side plate 3113. The first bottom plate 3111, the second bottom plate 3112 and the front stop bottom plate 3121 are sequentially connected in the forward movement direction of the front wheel sliding seat 2, the first side plate 3113 is connected to the left and right sides of the first bottom plate 3111 and the second bottom plate 3112, and the front stop vertical plate 3122 is located at one end of the front stop bottom plate 3121 away from the second bottom plate 3112. The second bottom plate 3112 is upwardly inclined towards the front stop bottom plate 3121, the first bottom plate 3111 is downwardly inclined towards the second bottom plate 3112, and the angle between the first bottom plate 3111 and the horizontal ground is smaller than the angle between the second bottom plate 3112 and the horizontal ground.

[0046] By setting the first side plate 3113, the front wheel can be prevented from moving in the left-right direction during the vehicle advancing, so that the front wheel is placed more stably; by setting the second bottom plate 3112 to be inclined upward towards the front blocking bottom plate 3121, when the front wheel is fixed in the front wheel containing groove 33, the second bottom plate 3112 is tangent to the outer circumference of the front wheel, so that the front wheel can be better fixed. By setting the first bottom plate 3111 to be inclined downward towards the second bottom plate 3112, the front wheel can be better fixed in the front wheel containing groove 33.

[0047] Specifically, after the front wheel overturning portion 32 overturns forward towards the front blocking portion 312, the bottom surface of the front end of the front wheel overturning portion 32 abuts against the upper end surface of the first bottom plate 3111.

[0048] Please refer to Figure 4 Further, the front blocking portion 312 further comprises an arc-shaped plate 3125 and a fixed side plate 3126 arranged in the first limiting space 3124.

[0049] The left and right sides of the arc-shaped plate 3125 are respectively connected with the fixed side plates 3126, one end of the arc-shaped plate 3125 is fixedly connected with the upper end of the front blocking vertical plate 3122, the other end of the arc-shaped plate 3125 is fixedly connected with the upper end surface of the second bottom plate 3112, and the bottom surface of the arc-shaped plate 3125 is tangent to the second bottom plate 3112; the ends of the two fixed side plates 3126 away from each other are respectively fixedly connected with the front blocking side plate 3123.

[0050] The arc-shaped plate 3125 and the two fixed side plates 3126 form a second limiting space 3127, and the second limiting space 3127 is in communication with the front wheel containing groove 33, so that the front part of the front wheel is limited in the second limiting space 3127.

[0051] Further, the shape of the arc-shaped plate 3125 is adapted to the shape of the front wheel of the vehicle, and the second limiting space 3127 is used for containing the front part of the front wheel. By setting the arc-shaped plate 3125 and the fixed side plate 3126, the front part of the front wheel can be limited in the second limiting space 3127, so that the front wheel is prevented from shaking in the left-right direction, and the stability of fixing the front wheel is improved.

[0052] Please refer to Figure 3 and Figure 4 Further, the front wheel overturning portion 32 comprises a first overturning portion 321, a second overturning portion 322 and a first pivot portion 323.

[0053] The first turnover part 321 comprises a first turnover bottom plate 3211, and the second turnover part 322 comprises a second turnover bottom plate 3221, and the first turnover bottom plate 3211 is connected with the second turnover bottom plate 3221 in a V shape.

[0054] The first shaft part 323 comprises a first sleeve 3231 and a first shaft 3232, the first sleeve 3231 is fixedly connected between the first turnover bottom plate 3211 and the second turnover bottom plate 3221, and two ends of the first shaft 3232 are respectively fixedly connected to the rear end of the fixed seat 311, and the first sleeve 3231 is sleeved on the outer periphery of the first shaft 3232, and the first sleeve 3231 is rotationally connected with the first shaft 3232.

[0055] By setting the first turnover bottom plate 3211 and the second turnover bottom plate 3221 in a V shape, the front wheels of the vehicle press the first turnover bottom plate 3211 and the second turnover bottom plate 3221 in turn, and when the center of gravity of the front wheels exceeds the first shaft 3232, the front wheels trigger the front wheel turnover part 32 to turn forward, so that the second turnover bottom plate 3221 is turned over to be pressed by the front wheels, and at this time, the front end of the front wheels abuts against the front blocking part 312, and the cutting point of the front blocking part 312 and the first turnover part 321 and the second turnover part 322 and the weight of the front wheels jointly form the locking of the front wheels, so that the front wheels are locked between the front wheel turnover part 32 and the front wheel fixing part 31. Under the action of manpower, the front wheels are moved backward, and the front wheel turnover part 32 reverses direction to turn over with the front wheels, thereby completing the unlocking of the front wheels.

[0056] In one embodiment, the front end of the front wheels enters the first limiting space 3124 and is tangent to the front blocking vertical plate 3122. In another embodiment, the front end of the front wheels enters the second limiting space 3127 and is tangent to the arc-shaped plate 3125. The cutting point of the front wheels, the arc-shaped plate 3125, the first turnover part 321 and the second turnover part 322 and the weight of the front wheels jointly form the locking of the front wheels, so that the front wheels are locked between the front wheel turnover part 32 and the front wheel fixing part 31.

[0057] Specifically, the two ends of the first shaft 3232 are respectively fixedly connected with two first side plates 3113. After the second turnover part 322 turns forward toward the front blocking part 312, the bottom surface of the front end of the second turnover bottom plate 3221 abuts against the upper end surface of the first bottom plate 3111.

[0058] Please refer to Figure 3 and Figure 4Further, the first turning part 321 further comprises a first turning side plate 3212, the left and right ends of the first turning bottom plate 3211 are respectively connected with the first turning side plate 3212, and a first through slot 3213 is formed between the first turning bottom plate 3211 and the first turning side plate 3212; the side edge of the first turning side plate 3212 close to the second turning part 322 is a bevel edge;

[0059] The second turning part 322 further comprises a second turning side plate 3222, the left and right ends of the second turning bottom plate 3221 are respectively connected with the second turning side plate 3222, and a second through slot 3223 is formed between the second turning bottom plate 3221 and the second turning side plate 3222; the first through slot 3213 and the second through slot 3223 are in communication with each other;

[0060] The first turning side plate 3212 is fixedly connected with the second turning side plate 3222 on the same side, the structure of the second turning side plate 3222 is the same as that of the first turning side plate 3212, and the second turning side plate 3222 and the first turning side plate 3212 are symmetrically arranged relative to the first rotating shaft part 323.

[0061] By arranging the first turning side plate 3212 and the second turning side plate 3222, the rear part of the front wheel can be fixed in the first through slot 3213 and the second through slot 3223, so as to avoid the displacement of the front wheel in the left-right direction, and help to improve the stability of the front wheel fixing mechanism 3 in fixing the front wheel.

[0062] Further, please refer to Figure 3 and Figure 4 The distance between the two first turning side plates 3212 gradually increases from bottom to top in the direction perpendicular to the first turning bottom plate 3211.

[0063] It should be noted that, since the second turning side plate 3222 and the first turning side plate 3212 are symmetrically arranged relative to the first rotating shaft part 323, it can be understood that the distance between the two second turning side plates 3222 also gradually increases from bottom to top in the direction perpendicular to the second turning bottom plate 3221.

[0064] By setting the distance between the two first turning side plates 3212 gradually increases from bottom to top in the height direction, the front wheel turning part 32 can be suitable for fixing front wheels of different sizes. When the width of the front wheel is small, the front wheel can only abut against the first turning bottom plate 3211 and the second turning bottom plate 3221. When the width of the front wheel is greater than the width of the first turning bottom plate 3211, the front wheel abuts against the first turning side plate 3212 and the second turning side plate 3222 respectively, so that the front wheel turning part 32 can lock front wheels of different sizes.

[0065] Please refer to Figure 3 and Figure 4 Further, the first turning part 321 further comprises an inclined baffle 3214, and the two first turning side plates 3212 are respectively connected with the inclined baffle 3214 away from the side of the second turning part 322, which helps to guide the front wheel to smoothly enter the first through slot 3213, avoiding the collision between the front wheel and the side of the first turning side plate 3212 due to the difficulty of aligning the front wheel with the first through slot 3213.

[0066] Further, the weight of the first turning part 321 is greater than the weight of the second turning part 322, that is, the turning of the second turning part 322 needs to be triggered by the front wheel pressing, so that the front wheel turning part 32 can be conveniently entered when used without the need to re-adjust the front wheel turning part 32.

[0067] Please refer to Figure 1 and Figure 5 Further, the front wheel turning part 32 further comprises a locking rod 324, which is fixedly arranged on the bottom surface of the first turning part 321, and the two ends of the locking rod 324 extend above the left and right side walls of the vehicle frame body 11 respectively. The upper ends of the left and right side walls of the parking rack 1 are respectively provided with a locking block 113, and the left and right ends of the locking rod 324 are respectively located at the rear end of the corresponding locking block 113, and the highest point of the locking block 113 is higher than the horizontal position of the bottom end surface of the locking rod 324.

[0068] By setting the cooperation between the locking rod 324 and the locking block 113, the locking block 113 is used to fix the front wheel slide 2 at the rear end of the parking rack 1, at this time, the front wheel turnover part 32 does not turn over, and the left and right ends of the locking rod 324 are located at the rear end of the locking block 113. When only the front wheel slide 2 is slid, the left and right ends of the locking rod 324 are resisted by the locking block 113, so that the front wheel slide 2 cannot move forward to achieve the locking of the front wheel slide 2, and the quick parking operation when the front wheel slide 2 is accidentally moved and needs to be parked can be avoided.

[0069] When parking, when a vehicle enters, the front wheel enters the front wheel turnover part 32 and continues to move forward to make the front wheel turnover part 32 turn over, the locking rod 324 is displaced with the upward turning of the first turnover part 321, and after the front wheel turnover part 32 is turned over, the position height of the locking rod 324 is higher than the position height of the highest point of the locking block 113. Continue to move the front wheel slide 2 forward, the locking rod 324 can pass the locking block 113, so as to complete the unlocking of the front wheel slide 2; when taking the vehicle, move the front wheel slide 2 backward until the locking rod 324 moves to the rear of the locking block 113, the front wheel is separated from the front wheel turnover part 32, the front wheel turnover part 32 turns backward and makes the locking rod 324 re-locked at the rear end of the locking block 113, and the front wheel slide 2 is re-locked at the rear end of the parking rack 1 when taking the vehicle.

[0070] Please refer to Figure 5 Further, the upper end surface of the locking block 113 is provided with a first guide inclined surface 1131, and the first guide inclined surface 1131 is inclined downward along the advancing direction of the front wheel slide 2.

[0071] When the front wheel slide 2 is accidentally moved and the front wheel slide 2 is unlocked (at this time, the front wheel fixing mechanism 3 is not fixed with the front wheel of the vehicle), at this time, the front wheel turnover part 32 is in a state of not turning forward, and by setting the first guide inclined surface 1131, the front wheel slide 2 can be re-locked. Specifically, by pulling the front wheel slide 2 backward, the locking rod 324 moves backward along the first guide inclined surface 1131, and when the locking rod 324 moves away from the first guide inclined surface 1131, the front wheel turnover part 32 can fall under the action of gravity, so that the locking rod 324 falls to the rear end of the locking block 113, and the front wheel slide 2 is re-locked.

[0072] Please refer to Figure 6Further illustrate, the left and right ends of the frame body 11 are provided with moving sliding grooves 112, the moving sliding grooves 112 are communicated with the installation cavities 111; the left and right ends of the front wheel sliding seat 2 are respectively provided with rollers 21, the axis of the rollers 21 is parallel to the horizontal ground, the rollers 21 are slidingly connected with the frame body 11 in the moving sliding grooves 112.

[0073] The left and right ends of the front wheel sliding seat 2 are also respectively provided with guide wheels 22, the axis of the guide wheels 22 is perpendicular to the horizontal ground, the guide wheels 22 are slidingly connected with the frame body 11 in the moving sliding grooves 112, and the guide wheels 22 abut against the inner side wall surface of the frame body 11.

[0074] By setting the rollers 21, the front wheel sliding seat 2 can be smoothly moved along the frame body 11; by setting the guide wheels 22, the front wheel sliding seat 2 can be guided to keep the correct direction during the movement, so that the front wheel sliding seat 2 is prevented from deviating during the movement, and the stability of the front wheel sliding seat 2 during the sliding is improved.

[0075] In other embodiments, the front wheel sliding seat 2 can also be slidingly connected with the frame body 11 through the structure of a sliding rail and a sliding block.

[0076] Further illustrate, please refer to Figure 1 and Figure 3 The vehicle front wheel fixing device also comprises a stroller platform 4, the stroller platform 4 is fixedly connected with the front wheel sliding seat 2, and the stroller platform 4 is located at the rear side of the front wheel turnover part 32; the stroller platform 4 comprises a platform body 41, the upper end surface of the platform body 41 is provided with a stroller inclined surface 411, one end of the stroller inclined surface 411 is connected with the bottom surface of the rear end of the front wheel turnover part 32, and the other end of the stroller inclined surface 411 is downwardly and obliquely arranged away from the front wheel turnover part 32.

[0077] By setting the stroller inclined surface 411, when parking, the user can push the front wheel of the vehicle through the stroller inclined surface 411 into the front wheel fixing mechanism 3, so as to realize the fixing of the front wheel; when taking the vehicle, the front wheel can also be pushed away from the front wheel fixing mechanism 3 through the stroller inclined surface 411, so that the user can push the vehicle more smoothly and labor-savingly when parking and taking the vehicle.

[0078] Further illustrate, please refer to Figure 3The trolley platform 4 further comprises a buffer pad 42 connected to the upper end face of the platform body 41, and the buffer pad 42 is located at the side of the trolley slope 411 close to the front wheel turnover part 32, and the bottom of the rear end of the front wheel turnover part 32 is supported on the buffer pad 42. Specifically, the platform body 41 supports the front wheel turnover part 32, and the impact force of the front wheel turnover part 32 on the platform body 41 can be further buffered by arranging the buffer pad 42.

[0079] In one embodiment, the front wheel fixing mechanism 3 is fixedly connected with the front wheel sliding seat 2.

[0080] In other embodiments, the front wheel fixing mechanism 3 can also be arranged to be rotatable, that is, the front wheel fixing mechanism 3 is rotatably connected with the front wheel sliding seat 2, please refer to Figure 7 Specifically, the fixing seat 311 of the front wheel fixing part 31 is rotatably connected with the front wheel sliding seat 2, the front stop part 312 is fixedly connected with the fixing seat 311, and the front wheel turnover part 32 is rotatably connected with the fixing seat 311, so that the front wheel turnover part 32 moves with the movement of the front wheel fixing part 31.

[0081] Since the straight-line distance between the two handlebars of a vehicle such as a bicycle, an electric vehicle or a motorcycle is generally the widest, if the vehicle is parked with the vehicle head and the vehicle body in a straight line, the width required for a single parking space will be larger, and the required land area for setting the vehicle front wheel fixing device will also be larger, thereby resulting in low space utilization. When the front wheel fixing mechanism 3 moves with the front wheel sliding seat 2 to the front end of the vehicle frame body 11, the front wheel fixing mechanism 3 drives the front wheel to swing along the rotation of the front wheel sliding seat 2 to make the vehicle head placed obliquely, so that the width required for the vehicle head after parking is smaller, and the required land area for setting the vehicle front wheel fixing device can be further reduced, which helps to improve the space utilization of the parking garage.

[0082] Further explanation, please refer to Figure 8 and Figure 9 The front wheel fixing part 31 further comprises a steering shaft 313, one end of the steering shaft 313 is fixedly connected with the bottom surface of the second bottom plate 3112, the other end of the steering shaft 313 is rotatably connected with the front wheel sliding seat 2, and the end of the steering shaft 313 away from the second bottom plate 3112 is inclined downward along the advancing direction of the front wheel sliding seat 2, so that the front wheel rotates with the fixing seat 311 to be placed obliquely.

[0083] Specifically, the front blocking portion 312 and the front wheel overturning portion 32 move along with the movement of the front wheel fixing portion 31. When the front wheel fixing mechanism 3 moves to the front end of the frame body 11 along with the front wheel sliding seat 2, the front wheel fixing mechanism 3 drives the front wheel to swing along the front wheel sliding seat 2, so that the vehicle head is placed obliquely, the required parking space width of the vehicle head after parking is smaller, the required land area of the self-weight locking type parking device can be further reduced, and the space utilization rate of the parking garage is improved.

[0084] Since the front wheel swing axis of the bicycle, motorcycle or electric vehicle is generally inclined downward in the forward direction of the front wheel, the utility model sets the steering shaft 313 to be inclined downward in the forward direction of the front wheel sliding seat 2, so that the front wheel can swing freely left and right; further, the axis of the steering shaft 313 coincides with the axis of the front wheel swing axis of the vehicle.

[0085] Further, as shown in Figure 8 and Figure 9 , the steering shaft 313 is arranged perpendicularly to the second bottom plate 3112. This helps to arrange the steering shaft 313 and make the axis of the steering shaft 313 coincide with the axis of the front wheel swing axis, ensuring the stability and smoothness of steering.

[0086] Further, as shown in Figure 8 and Figure 9 , the front wheel sliding seat 2 comprises a sliding seat body 23 and a convex column 24, the upper end surface of the sliding seat body 23 is connected with the convex column 24, the end surface of the convex column 24 facing the steering shaft 313 is provided with a rotating cavity 241 matched with the steering shaft 313, and one end of the steering shaft 313 away from the fixing seat 311 is inserted into the rotating cavity 241 and rotationally connected with the convex column 24. By arranging the convex column 24, the stability of the fixing seat 311 when rotating around the front wheel sliding seat 2 can be improved. Specifically, the front wheel sliding seat 2 further comprises a rotating bearing 25, one end of the steering shaft 313 away from the fixing seat 311 is fixedly connected with the inner ring of the rotating bearing 25, and the outer ring of the rotating bearing 25 is fixedly connected with the inner peripheral wall of the convex column 24 in the rotating cavity 241. Further, the convex column 24 is arranged perpendicularly to the second bottom plate 3112 to better adapt to the steering shaft 313. Specifically, the roller 21 and the guide wheel 22 are arranged on the left and right sides of the sliding seat body 23.

[0087] Further, as shown in Figure 6 and Figure 10The parking rack 1 further includes a steering guide rail 12, which is disposed within the mounting cavity 111 and is used to limit the displacement path of the front wheel fixing mechanism 3. The front wheel fixing part 31 also includes a guide post 314 that cooperates with the steering guide rail 12. One end of the guide post 314 is fixedly connected to the bottom end face of the front bumper part 312, and the other end of the guide post 314 extends into the steering guide rail 12 and is movably connected to the steering guide rail 12. The guide post 314 is located in front of the steering shaft 313. The steering guide rail 12 includes a straight segment 121 and an oblique segment 122 that are interconnected. The straight segment 121 and the oblique segment 122 are arranged sequentially along the length direction of the parking rack 1. The straight segment 121 is disposed in the middle of the frame body 11. One end of the oblique segment 122 is connected to the straight segment 121, and the other end of the oblique segment 122 extends obliquely toward one side wall of the frame body 11.

[0088] By setting the steering guide rail 12 and the guide post 314, the guide post 314 moves within the steering guide rail 12. The steering guide rail 12 can be used to guide and limit the displacement path of the front wheel fixing mechanism 3 and the front wheel slide 2. The steering guide rail 12 includes a straight segment 121 and an inclined segment 122 that are interconnected. The guide post 314 passes through the straight segment 121 and the inclined segment 122 in sequence, simultaneously driving the front wheel slide 2 and the front wheel fixing mechanism 3 to pass through the straight segment 121 and the inclined segment 122 in sequence. When the guide post 314 passes through the inclined segment 122, since the inclined segment 122 is towards the vehicle frame... The front wheel fixing part 31 is obliquely arranged on one side wall of the body 11, forcing the front wheel fixing part 31 to rotate around the front wheel slide 2. The direction of rotation of the front wheel fixing part 31 is consistent with the direction of the oblique line segment 122. As the front wheel slide 2 moves forward, the front wheel fixing part 31 gradually rotates towards one side wall of the frame body 11 (i.e., the oblique direction of the oblique line segment 122), causing the front wheel to swing towards one side wall of the frame body 11. This results in the front of the vehicle being placed at an angle, reducing the required parking space width after the vehicle is parked. This reduces the footprint required for the self-locking parking device and helps improve the space utilization of the parking garage. Specifically, the guide post 314 is fixedly connected to the bottom surface of the front fender 3121.

[0089] Further, by setting the steering guide rail 12 and the front wheel fixing mechanism 3 simultaneously, when the user parks the vehicle, the user only needs to push the vehicle forward at the rear end of the vehicle, so that the front wheel sliding seat 2 moves forward, the guide column 314 moves along the path of the steering guide rail 12, and the vehicle moves forward while the front end swings to be placed obliquely.

[0090] Further, referring to Figure 6 and Figure 10 , the steering guide rail 12 further comprises an extension section 123 connected to one end of the oblique section 122 away from the straight section 121, and the extension section 123 is arranged parallel to the straight section 121. By arranging the extension section 123, the self-weight locking type parking device can be adapted to vehicles of different body lengths. When in use, after the front end of the vehicle moves along the oblique section 122 and is placed obliquely, the vehicle can continue to move forward along the extension section 123, thereby improving the applicability and practicality of the self-weight locking type parking device.

[0091] Further, referring to Figure 6 , one end of the guide column 314 away from the front stop 312 is arranged obliquely towards a side wall of the vehicle frame body 11, and the oblique direction of the guide column 314 is the same as the oblique extension direction of the oblique section 122; one end of the guide column 314 away from the front stop 312 abuts against the inner side wall of the straight section 121.

[0092] By arranging the guide column 314 to be oblique towards a side wall of the vehicle frame body 11 and abutting against the side wall of the straight section 121, the guide column 314 can abut against the side walls of the straight section 121, the oblique section 122 and the extension section 123 in sequence when moving along the straight section 121, the oblique section 122 and the extension section 123.

[0093] The obliquely arranged guide column 314 can generate a certain friction force when cooperating with the straight section 121, the oblique section 122 and the extension section 123, thereby preventing the guide column 314 from sliding or deviating from the predetermined movement path without external force, and thus can play a self-locking role to ensure the position stability of the fixing seat 311 and the front wheel sliding seat 2.

[0094] The obliquely arranged guide column 314 can also better adapt to the oblique angle of the oblique section 122, thereby ensuring that the guide column 314 always moves along the paths of the straight section 121, the oblique section 122 and the extension section 123 during movement, and improving the stability of the guide.

[0095] Further, please refer to Figure 6 , the end of the guide column 314 away from the front stop 312 is connected with a steel ball 3141, the steel ball 3141 is in contact with the side wall of the straight line segment 121 towards the inclined direction of the oblique line segment 122. By setting the steel ball 3141, the rolling friction between the steel ball 3141 and the steering guide rail 12 can reduce the friction coefficient, thereby reducing the friction and wear between the guide column 314 and the steering guide rail 12, prolonging the service life of the guide column 314 and the steering guide rail 12.

[0096] Further, the guide column 314 and the steel ball 3141 can be fixedly welded, or can be detachably connected, such as threaded connection (the end of the guide column 314 away from the fixed seat 311 is provided with an external thread, the steel ball 3141 is provided with a threaded hole, and the threaded hole is provided with an internal thread threadedly connected with the external thread, so that the guide column 314 is threadedly connected with the steel ball 3141), which can facilitate disassembly and replacement of the steel ball 3141, and when the steel ball 3141 needs to be replaced due to severe wear, only the steel ball 3141 needs to be replaced without replacing the guide column 314, which helps to reduce costs.

[0097] Further, please refer to Figure 6 and Figure 9 , the sliding seat body 23 is provided with a guide hole 231 matched with the guide column 314, and the end of the guide column 314 away from the front stop 312 penetrates through the guide hole 231 and is slidably connected with the steering guide rail 12. By setting the guide hole 231, when the guide column 314 moves along the steering guide rail 12, the guide column 314 can simultaneously move along the guide hole 231, so as to facilitate the rotation of the front wheel fixing mechanism 3 around the front wheel sliding seat 2.

[0098] Further, please refer to Figure 9 , the guide hole 231 is a circular arc-shaped through hole. Since the front wheel fixing mechanism 3 rotates around the front wheel sliding seat 2, the swing path of the guide column 314 is a circular motion with the connecting point of the steering shaft 313 and the second bottom plate 3112 as the center and the line from the center to the end of the guide column 314 away from the front stop 312 as the radius. By setting the guide hole 231 as a circular arc-shaped through hole, the shape of the guide hole 231 can be adapted to the movement path of the guide column 314, which further limits the rotational displacement of the front wheel fixing mechanism 3 and improves the stability of the front wheel fixing mechanism 3 during rotation.

[0099] The above merely describes preferred embodiments of the present application, and is not intended to limit the patent scope of the present application, and any equivalent structural transformation or direct / indirect application in other related technical fields under the inventive concept of the present application, as described in the present application specification and drawings, is included in the patent protection scope of the present application.

Claims

1. A vehicle front wheel fixing device, characterized in that, include: Parking rack, front wheel slide, and front wheel fixing mechanism; The parking rack includes a frame body, and the frame body is provided with a mounting cavity; The front wheel slide is slidably disposed in the mounting cavity, and the front wheel slide slides back and forth along the frame body; The front wheel fixing mechanism includes a front wheel fixing part and a front wheel flipping part; the front wheel fixing part is connected to the front end of the front wheel slide, and the front wheel flipping part is rotatably connected to the rear end of the front wheel slide; the front wheel flipping part flips back and forth in the direction of the front wheel fixing part; a front wheel receiving groove for fixing the front wheel of the vehicle is formed between the front wheel fixing part and the front wheel flipping part.

2. The vehicle front wheel fixing device according to claim 1, characterized in that, The front wheel fixing part includes a fixing seat and a front stop; the fixing seat is connected to the front end of the front wheel slide, the front stop is fixedly connected to the front end of the fixing seat, the front wheel flipping part is rotatably connected to the rear end of the fixing seat, and the front wheel flipping part flips back and forth in the direction of the front stop. The upper end of the front bumper is open; the fixed seat, the front bumper, and the front wheel tilting part together form the front wheel receiving groove.

3. The vehicle front wheel fixing device according to claim 2, characterized in that, The front windshield includes a front windshield bottom plate, a front windshield vertical plate, and a front windshield side plate; One end of the front windshield base plate is fixedly connected to the end of the fixed seat away from the front wheel tilting part, the other end of the front windshield base plate is fixedly connected to the front windshield vertical plate, and the front windshield vertical plate is fixedly connected to the upper end surface of the front windshield base plate. The front windshield side plates are respectively connected to the left and right ends of the front windshield base plate, and the two front windshield side plates are respectively fixedly connected to the left and right ends of the front windshield vertical plate. The front windshield bottom plate, the front windshield vertical plate, and the two front windshield side plates enclose a first limiting space, which is connected to the front wheel receiving groove so that the front part of the front wheel is limited to the first limiting space.

4. The vehicle front wheel fixing device according to claim 3, characterized in that, The fixed base includes a first base plate, a second base plate, and a first side plate; the first base plate, the second base plate, and the front bumper base plate are connected sequentially along the forward direction of the front wheel slide, and the first side plate is connected to the left and right sides of the first base plate and the second base plate; and the front bumper vertical plate is located at the end of the front bumper base plate away from the second base plate; the second base plate is inclined upward toward the front bumper base plate, the first base plate is inclined downward toward the second base plate, and the angle between the first base plate and the horizontal ground is smaller than the angle between the second base plate and the horizontal ground.

5. The vehicle front wheel fixing device according to claim 4, characterized in that, The front baffle also includes an arc-shaped plate and a fixed side plate disposed within the first limiting space; The left and right sides of the arc-shaped plate are respectively connected to the fixed side plates. One end of the arc-shaped plate is fixedly connected to the upper end of the front bumper vertical plate, and the other end of the arc-shaped plate is fixedly connected to the upper end surface of the second base plate. The bottom surface of the arc-shaped plate is tangent to the second base plate. The two fixed side plates are respectively fixedly connected to the front bumper side plate at opposite ends. The arc-shaped plate and the two fixed side plates enclose a second limiting space, which is connected to the front wheel receiving groove so that the front part of the front wheel is limited within the second limiting space.

6. The vehicle front wheel fixing device according to claim 2, characterized in that, The front wheel tilting section includes a first tilting section, a second tilting section, and a first pivot section; The first flipping part includes a first flipping base plate, and the second flipping part includes a second flipping base plate. The first flipping base plate and the second flipping base plate are connected in a V-shape. The first rotating shaft includes a first sleeve and a first rotating shaft. The first sleeve is fixedly connected between the first flip base plate and the second flip base plate. The two ends of the first rotating shaft are respectively fixedly connected to the rear end of the fixed base, and the first sleeve is sleeved on the outer periphery of the first rotating shaft. The first sleeve is rotatably connected to the first rotating shaft.

7. The vehicle front wheel fixing device according to claim 6, characterized in that, The first flipping part further includes a first flipping side plate, and the first flipping side plate is connected to the left and right ends of the first flipping bottom plate respectively. The first flipping bottom plate and the first flipping side plate form a first through groove; the side of the first flipping side plate near the second flipping part is a bevel. The second flipping part also includes a second flipping side plate, and the left and right ends of the second flipping bottom plate are respectively connected to the second flipping side plate. The second flipping bottom plate and the second flipping side plate form a second through groove; the first through groove and the second through groove are interconnected. The first flip side plate is fixedly connected to the second flip side plate on the same side. The structure of the second flip side plate is the same as that of the first flip side plate, and the second flip side plate and the first flip side plate are symmetrically arranged relative to the first rotating shaft.

8. The vehicle front wheel fixing device according to claim 6, characterized in that, The front wheel tilting part also includes a locking rod, which is fixedly installed on the bottom surface of the first tilting part, and the two ends of the locking rod extend to the upper part of the left and right side walls of the frame body respectively; the upper ends of the left and right side walls of the parking frame are respectively provided with locking blocks, and the left and right ends of the locking rod are respectively located at the rear end of the corresponding locking blocks, and the horizontal plane of the highest point of the locking block is higher than the horizontal plane of the bottom end of the locking rod.

9. The vehicle front wheel fixing device according to claim 8, characterized in that, The upper surface of the locking block is provided with a first guide slope, and the first guide slope is inclined downward along the forward direction of the front wheel slide.

10. The vehicle front wheel fixing device according to claim 1, characterized in that, The left and right ends of the frame body are provided with movable sliding grooves, which are connected to the mounting cavity; the left and right ends of the front wheel slide are respectively provided with rollers, the axis of the rollers is parallel to the horizontal ground, and the rollers are slidably connected to the frame body in the movable sliding grooves. The left and right ends of the front wheel slide are respectively provided with guide wheels. The axis of the guide wheel is perpendicular to the horizontal ground. The guide wheel is slidably connected to the frame body in the movable slide groove, and the guide wheel abuts against the inner wall of the frame body.

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