CN220952887U - Pedal mechanism for electric pick car and electric pick car thereof - Google Patents

Abstract

The utility model provides a pedal mechanism for an electric pick car and the electric pick car, wherein the pedal mechanism for the electric pick car comprises a rear support frame for supporting a front support frame, and the pedal mechanism comprises a pedal support frame which is connected with the rear support frame; the pedal support frame is connected with a pedal inclined plate, and one end of the pedal inclined plate, which is close to the rear support frame, is higher than one end of the pedal inclined plate, which is far away from the rear support frame. The utility model solves the problem of how to more comfortably and conveniently fix the electric pick car in the prior art.

Description

Pedal mechanism for electric pick car and electric pick car thereof

Technical Field

The utility model relates to the technical field of electric pick vehicles, in particular to a pedal mechanism for an electric pick vehicle and the electric pick vehicle.

Background

The existing electric pick car comprises a front support frame used for fixing the electric pick and a rear support frame used for supporting the front support frame, when the electric pick car is used, a user needs to prop up the toe, the heel is grounded, the sole treads on the rear support frame to prop against the electric pick car, but because the included angle between the front support frame and the rear support frame needs to be adjusted in the use process of the electric pick car, the inclination angle of the rear support frame is changed continuously, the inclination angle of the sole of the user also changes along with the change, the electric pick car is uncomfortable, the fixed force application of the sole of the user to the rear support frame is inconvenient, if the rear support frame is steeper, the fixed force application of the sole of the user to the rear support frame is difficult, and the electric pick car is difficult to use when being fully pushed forward by hands and encounters larger resistance.

Therefore, how to more comfortably and conveniently fix the electric pick car becomes a technical problem to be solved.

Disclosure of utility model

The utility model aims to provide a pedal mechanism for an electric pick car and the electric pick car thereof, which mainly solve the technical problem of how to more comfortably and conveniently fix the electric pick car in the prior art.

To achieve the above object, the present utility model is achieved by: the utility model provides a pedal mechanism that electric pick car was used, electric pick car is including the back support frame that is used for supporting preceding support frame, its characterized in that: the pedal mechanism comprises a pedal support frame which is connected with the rear support frame;

The pedal support frame is connected with a pedal inclined plate, and one end of the pedal inclined plate, which is close to the rear support frame, is higher than one end of the pedal inclined plate, which is far away from the rear support frame.

Further, the pedal support frame is connected with the pedal sloping plate through an elastic piece;

And/or the pedal support frame is connected with the rear support frame through a connecting shaft.

Further, universal wheels are arranged below the pedal support frame.

Further, the pedal inclined plate is provided with an anti-skid pattern;

And/or the elastic piece comprises a first elastic piece and a second elastic piece, the first elastic piece is higher than the second elastic piece, the first elastic piece is arranged at one end of the pedal support frame close to the rear support frame, and the second elastic piece is arranged at one end of the pedal support frame far away from the rear support frame;

and/or the universal wheel is positioned below one end of the pedal support frame far away from the rear support frame.

An electric pick car, characterized in that: the electric pick car comprises the pedal mechanism for the electric pick car, and the pedal support frame is connected with the rear support frame through the second connecting shaft.

Further, the electric pick car further comprises a clamping mechanism for the electric pick power line, the clamping mechanism comprises a connecting plate, one end of the connecting plate is connected with the front supporting frame, and a supporting pad and a clamping block for clamping the electric pick power line are arranged at the other end of the connecting plate.

Further, a groove for positioning the electric pick power line is formed in the supporting pad, and the clamping block and the groove are matched with each other to clamp the electric pick power line;

and/or the connecting plate is detachably connected with the wrench;

And/or the support pad is a plastic piece or an elastic piece;

And/or the front support frame is linked with one end of the rear support frame through a first connecting shaft, and the other end of the rear support frame is connected with the rear wheel through a second connecting shaft.

Further, the electric pick car further comprises an angle adjusting mechanism for adjusting the angle of the included angle between the front support frame and the rear support frame, the angle adjusting mechanism comprises an arc dial, a fifth installation frame and a connecting rod, the arc dial is provided with a plurality of clamping grooves, and the arc dial is connected below the front support frame;

The fifth installation frame is connected to the rear support frame, the fifth installation frame is further provided with a fifth U-shaped support, one end of the connecting rod penetrates through two sides of the U-shaped support and then is connected with the locking block, the locking block corresponds to the clamping groove, a fifth spring is nested in the position, located in the U-shaped support, of the connecting rod, one end, close to the locking block, of the fifth spring is connected with the connecting rod, and one end, far away from the locking block, of the fifth spring is connected with one end, far away from the locking block, of the fifth U-shaped support;

the connecting wire at the other end of the connecting rod is connected with the trigger at the handle.

Further, the electric pick car further comprises a faucet assembly, the faucet assembly comprises a cross rod, two ends of the cross rod are respectively connected with a handle, the cross rod is connected to the top of the front support frame through a sixth U-shaped support, and a hollowed-out portion is arranged between the cross rod and the front support frame.

Further, the bottom of the front end of the front support frame is provided with a roller or a universal wheel;

and/or the front support frame is provided with a pressing plate for fixing the connecting wire;

and/or a tensioning spring is arranged between the front end of the front support frame and the rear support frame;

and/or the rear wheel is detachably connected with the second connecting shaft;

And/or the sixth U-shaped bracket is detachably connected to the top of the front support frame;

and/or one end of the connecting plate is detachably connected with the front supporting frame;

and/or the arc dial is detachably connected below the front support frame;

And/or the fifth mounting rack is detachably connected to the rear supporting rack;

And/or the other end of the connecting plate faces obliquely upwards, the horizontal projection length of the other end of the connecting plate is greater than that of the corresponding rear wheel, and the horizontal projection length of the other end of the connecting plate is less than that of the corresponding handle;

and/or the other end of the connecting plate is U-shaped, a plastic part is arranged on the lower inner side wall of the U-shaped supporting pad, a groove is formed in the top of the plastic part, a fourth mounting hole is formed in the upper inner side wall of the U-shaped supporting pad, a butterfly bolt is arranged in the fourth mounting hole, the bottom of the butterfly bolt is connected with a clamping block, and the clamping block corresponds to the groove.

In view of the above structure, the present utility model has the advantages that:

According to the pedal mechanism for the electric pick vehicle, the pedal mechanism connected with the rear support frame is added, so that the pedal inclined plate angle of the pedal mechanism is not influenced by the rear support frame in the use process of the electric pick vehicle, the pedal inclined plate is kept constant, a user can pedal the pedal inclined plate at an angle, the pedal inclined plate is conveniently fixed, stable support is provided for the electric pick vehicle, the good comfort level of the pedal inclined plate is unchanged, the pedal inclined plate is stressed more stably and is not easy to slip, and in other words, the electric pick vehicle can be more comfortably and conveniently stabilized by the user. Meanwhile, a user can apply pedal force and force forwards, so that the thrust of the hands is reduced, and the hand-held bicycle is more labor-saving to use.

Drawings

Fig. 1 is a schematic view of a pedal mechanism for an electric pick-up vehicle according to embodiment 1;

fig. 2 is a schematic structural view 1 of an electric pick-up truck according to embodiment 2;

fig. 3 is a schematic structural view 2 of an electric pick-up truck according to embodiment 2;

fig. 4 is a schematic structural view of a clamping mechanism for a power cord of an electric pick in embodiment 3;

fig. 5 is a schematic view of the construction of an electric pick car in embodiment 3 (showing a clamping mechanism);

Fig. 6 is a schematic view of the construction of an electric pick car in embodiment 4 (an angle adjusting mechanism is shown).

In the figure: 20. a pedal mechanism; 21. a pedal support frame; 22. a pedal sloping plate; 22-1, anti-skid patterns; 23-1, a first elastic member; 23-2, a second elastic member; 24. a second universal wheel;

40. A clamping mechanism for the power line of the electric pick; 41. a connecting plate; 41-1, a fourth mounting hole; 42-1, plastic parts; 42-2, grooves; 43. a clamping block; 43-1, a butterfly bolt; 44. a wrench;

50. an angle adjusting mechanism; 51. an arc dial; 51-1, a clamping groove; 52. a fifth mounting bracket; 53. a connecting rod; 54. a fifth U-shaped bracket; 55. a locking block; 56. a fifth spring; 57. a connecting wire; 58. a trigger; 59. tensioning the spring;

60. An electric pick vehicle; 61. a front support; 61-1, a first connecting shaft; 61-2, mounting holes; 62. a rear support; 62-2, a second connecting shaft; 63. a rear wheel; 64. a faucet assembly; 64-1, a handle; 64-2, a cross bar; 64-3, a sixth U-shaped bracket; 64-4, a hollowed-out part; 65. and (5) pressing plates.

Detailed Description

The utility model is further described below in conjunction with the detailed description. It is to be understood that these examples are illustrative of the present utility model and are not intended to limit the scope of the present utility model. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the teachings of the present utility model, and such equivalents are intended to fall within the scope of the utility model as defined in the appended claims.

Referring to fig. 1, in a specific embodiment 1, the present embodiment 1 provides a pedal mechanism 20 for an electric pick car, the electric pick car 60 includes a rear support frame 62 for supporting a front support frame 61, the front support frame 61 is used for installing and fixing an electric pick, so that the electric pick can work conveniently, the pedal mechanism 20 includes a pedal support frame 21, the pedal support frame 21 is connected with the rear support frame 62, an operator can also step on a pedal inclined plate 22 to help fix the electric pick car 60, the impact force of the electric pick to the electric pick car 60 is relieved, the pedal inclined plate 22 is connected to the pedal support frame 21, and one end of the pedal inclined plate 22 close to the rear support frame 62 is higher than one end of the pedal inclined plate 22 far away from the rear support frame 62. No matter how the angles of the front support frame 61 and the rear support frame 62 are adjusted, the inclination angle of the pedal inclined plate 22 is not affected, that is, the inclination angle of the pedal inclined plate 22 is not changed once being fixed (namely, the pedal inclined plate 22 and the ground always keep a fixed angle), the pedal inclined plate 22 is always fixed by the foot of a user, so that the electric pick car 60 is stably supported, the comfort level of the pedal inclined plate 22 is unchanged by the foot of the user, the pedal inclined plate 22 is more stable in stress and is not easy to slip, that is, the electric pick car can be more comfortably and conveniently stabilized by the user, the pedal is stepped forward by force, forward thrust can be applied, the hand thrust is lightened, and the electric pick car is more labor-saving to use.

Or the pedal support frame 21 is connected with the rear support frame 62 through a connecting shaft (such as the second connecting shaft 62-2), and the pedal support frame 21 can be turned over with the pedal inclined plate 22 so as to be convenient for storage.

Preferably, the pedal support 21 is connected to the pedal inclined plate 22 through an elastic member, for example, the elastic member comprises a first elastic member 23-1 and a second elastic member 23-2, the first elastic member 23-1 is higher than the second elastic member 23-2, the first elastic member 23-1 is disposed at one end of the pedal support 21 close to the rear support 62, and the second elastic member 23-2 is disposed at one end of the pedal support 21 far from the rear support 62, so that the operator can conveniently tread on the pedal inclined plate 22. The impact force of the electric pick is sequentially transmitted to the front support frame 61, the rear support frame 62, the pedal support frame 21, the elastic pieces (such as the first elastic piece 23-1 and the second elastic piece 23-2) and the pedal inclined plate 22, and finally, the impact force of the electric pick can be effectively relieved by the elastic pieces, and the impact force on the feet of an operator is reduced by the elastic pieces.

Preferably, the second universal wheel 24 is arranged below the pedal support frame 21, and the pedal mechanism 20 can conveniently and synchronously move the position when the electric pick car 60 needs to move the position. For example, the second universal wheels 24 are located below one end of the pedal support frame 21 far away from the rear support frame 62, and are combined with the rear support frame 62 which is respectively connected with the two sides of the front end of the pedal support frame 21 through connecting shafts (such as the second connecting shaft 62-2), or the two sides of the front end of the pedal support frame 21 are respectively connected with the rear support frame 62, so that three-point support of the pedal support frame 21 is formed, and the pedal inclined plate 22 is more stable.

Preferably, the pedal inclined plate 22 is provided with the anti-skid pattern 22-1, so that the user cannot easily slip and is safer when stepping on the pedal inclined plate 22.

Referring to fig. 2 to 3, in embodiment 2, an electric pick car 60 is provided in the present embodiment 2, a front support 61 for mounting an electric pick is linked with one end of a rear support 62 through a first connecting shaft 61-1, the other end of the rear support 62 is connected with a rear wheel 63 through a second connecting shaft 62-2, the electric pick car 60 includes a pedal mechanism 20 for the electric pick car 60 in the above embodiment 1, the pedal support 21 is connected with the rear support 62 through the second connecting shaft 62-2, the pedal support 21 and the rear wheel 63 share a second connecting shaft 62-2, the pedal support 21 is turned over along the second connecting shaft 62-2, so that the pedal support 21 and the rear support 62 are folded together, and the pedal mechanism 20 is better accommodated.

Referring to fig. 4 to 5, embodiment 3 provides an electric pick car 60, and embodiment 3 is different from the foregoing embodiments in that: the electric pick car 60 further comprises a clamping mechanism 40 for the electric pick power cord, the clamping mechanism comprises a connecting plate 41, one end of the connecting plate 41 is connected with the front supporting frame 61, and a supporting pad and a clamping block 43 for clamping the electric pick power cord are arranged at the other end of the connecting plate 41.

The electric pick power line positioning device is characterized in that a groove 42-2 for positioning the electric pick power line is formed in the supporting pad, the clamping block 43 and the groove 42-2 are matched to clamp the electric pick power line, for example, the other end of the connecting plate 41 is U-shaped, a plastic piece 42-1 (namely, the supporting pad) is arranged on the lower inner side wall of the other end of the U-shaped connecting plate 41, the groove 42-2 is arranged at the top of the plastic piece 42-1, a fourth mounting hole 41-1 is formed in the upper inner side wall of the U-shaped supporting pad, the butterfly bolt 43-1 is arranged in the fourth mounting hole 41-1, the bottom of the butterfly bolt 43-1 is connected with the clamping block 43, the clamping block 43 corresponds to the groove 42-2, the electric pick power line is only placed in the groove 42-2, then the butterfly bolt 43-1 is screwed to clamp the clamping block 43 on the electric pick power line, the electric pick power line is matched with the groove 42-2, the electric pick power line is prevented from being wound with the rear wheel 63, and the electric pick power line can be effectively protected from being used safely.

Preferably, the connection plate 41 is removably connected to the wrench 44 to facilitate access to the wrench 44, and use of the wrench 44 to mount various components of the electric pick car 60 (including, but not limited to, the rear wheels 63, the foot pedal mechanism 20, the angle adjustment mechanism 50, the faucet assembly 64, etc.).

Preferably, the support pad is a plastic part 42-1 or an elastic part, so that the electric pick power line can be clamped and better protected.

The length of connecting plate 41 is convenient for install spanner 44 to the extension as far as possible of connecting plate 41 other end is oriented obliquely upward, utilizes the design of connecting plate 41 other end oriented obliquely upward simultaneously, stabilizes the height position of connecting plate 41 other end, and the horizontal projection length of connecting plate 41 other end is greater than the horizontal projection length of corresponding rear wheel 63, and the horizontal projection length of connecting plate 41 other end is less than the horizontal projection length of corresponding handle 64-1, both can avoid the electric pick power cord to twine with rear wheel 63, can ensure again that the connecting plate 41 other end can not bump with wall etc. because of overlength.

Referring to fig. 6, embodiment 4 provides an electric pick car 60, and embodiment 4 is different from the foregoing embodiments in that: the electric pick car 60 further comprises an angle adjusting mechanism 50 for adjusting the angle of the included angle between the front support frame 61 and the rear support frame 62, the angle adjusting mechanism 50 comprises an arc dial 51, a fifth mounting frame 52 and a connecting rod 53, the arc dial 51 is provided with a plurality of clamping grooves 51-1, and the arc dial 51 is connected below the front support frame 61;

The fifth mounting frame 52 is connected to the rear supporting frame 62, the fifth mounting frame 52 is further provided with a fifth U-shaped bracket 54, one end of a connecting rod 53 penetrates through two sides of the U-shaped bracket and then is connected with a locking block 55, the locking block 55 corresponds to the clamping groove 51-1, a fifth spring 56 is nested in the position of the connecting rod 53 in the U-shaped bracket, one end of the fifth spring 56 close to the locking block 55 is connected with the connecting rod 53, and one end of the fifth spring 56 far away from the locking block 55 is connected with one end of the fifth U-shaped bracket 54 far away from the locking block 55; the other end of the connecting rod 53 is connected to a connecting wire 57 (e.g., a wire rope) to the trigger 58 at the handle 64-1.

When the angle between the front support frame 61 and the rear support frame 62 needs to be adjusted, the user only needs to control the trigger 58 to tighten the connecting wire 57, the connecting wire 57 pulls the connecting rod 53, the connecting rod 53 drives the locking block 55 to leave the original clamping groove 51-1 (the fifth spring 56 is compressed, the tightening spring 59 is further stretched), at this time, the front support frame 61 and the rear support frame 62 can be folded or overturned along the first connecting shaft 61-1, after the angle between the front support frame 61 and the rear support frame 62 is adjusted, the user controls the trigger 58 again to loosen the connecting wire 57, at this time, the connecting rod 53 moves forward with the locking block 55 under the action of the fifth spring 56, and the locking block 55 is embedded into the new clamping groove 51-1, at this time, the angle between the front support frame 61 and the rear support frame 62 is adjusted and fixed.

Preferably, a tensioning spring 59 is arranged between the front end of the front supporting frame 61 and the rear supporting frame 62, the tensioning spring 59 is matched with the angle adjusting mechanism 50, triangular shapes and angle fixing are formed among the front supporting frame 61, the rear supporting frame 62 and the tensioning spring 59, the locking block 55 is prevented from accidentally sliding out of the corresponding clamping groove 51-1, the locking block 55 can be tightly clamped in the clamping groove 51-1 all the time, and the use stability (the angle between the front end and the rear supporting frame 62 is unchanged) and the safety of the electric pick car 60 are improved.

Referring to fig. 2, 3, 5 and 6, embodiment 5 provides an electric pick-up truck 60, and embodiment 5 is different from the foregoing embodiments in that: the electric pick car 60 further comprises a faucet assembly 64, the faucet assembly 64 comprises a cross rod 64-2, two ends of the cross rod 64-2 are respectively connected with a handle 64-1, the cross rod 64-2 is connected to the top of the front support frame 61 through a sixth U-shaped support 64-3, a hollowed-out portion 64-4 is arranged between the cross rod 64-2 and the front support frame 61, a user can conveniently pass through the hollowed-out portion 64-4 by hands, and the whole electric pick car 60 is driven to move by pulling the cross rod 64-2, so that the electric pick car is more convenient to use.

Referring to fig. 2, 3, 5 and 6, embodiment 6 provides an electric pick car 60, and embodiment 6 is different from the foregoing embodiments in that: the bottom of the front end of the front supporting frame 61 is provided with rollers (not shown in the drawing) or universal wheels, and the rear wheels 63 are matched, so that the electric pick car 60 can be moved more effort-effectively, and the use is more convenient.

Referring to fig. 2 and 6, embodiment 7 provides an electric pick car 60, and the difference between embodiment 7 and the previous embodiment is that: the front support frame 61 is provided with a pressing plate 65 for fixing the connecting wire 57, so that the connecting wire 57 is prevented from being overlong and too loose, and the connecting wire 57 is prevented from being damaged or broken due to shaking and bending in the use process.

Embodiment 8, embodiment 8 provides an electric pick car 60, and the difference between the embodiment 8 and the previous embodiment is that: the rear wheel 63 is detachably connected with the second connecting shaft 62-2, the sixth U-shaped bracket 64-3 is detachably connected at the top of the front supporting frame 61, one end of the connecting plate 41 is detachably connected with the front supporting frame 61, the arc dial 51 is detachably connected below the front supporting frame 61, the fifth mounting frame 52 is detachably connected with the rear supporting frame 62, (51, 52 are not detachable, but the included angle between 61 and 62 can be adjusted, and the tail clamping mechanism 30 is detachable) is used for detaching the electric pick car 60, so that the electric pick car is convenient to store and the storage space is minimum.

The foregoing description is merely illustrative of the preferred embodiments of the present utility model, and is not intended to limit the scope of the present utility model. Equivalent changes and modifications are intended to be within the scope of the present utility model as defined in the appended claims.

Claims (10)

1. Pedal mechanism for electric pick car, electric pick car (60) including being used for supporting back support frame (62) of preceding support frame (61), its characterized in that: the pedal mechanism (20) comprises a pedal support frame (21), and the pedal support frame (21) is connected with a rear support frame (62);

the pedal support frame (21) is connected with the pedal sloping plate (22), and one end of the pedal sloping plate (22) close to the rear support frame (62) is higher than one end of the pedal sloping plate (22) far away from the rear support frame (62).

2. A pedal mechanism for an electric pick vehicle as claimed in claim 1, wherein: the pedal support frame (21) is connected with the pedal sloping plate (22) through an elastic piece;

And/or the pedal support frame (21) is connected with the rear support frame (62) through a connecting shaft.

3. A pedal mechanism for an electric pick vehicle as claimed in claim 2, wherein: a second universal wheel (24) is arranged below the pedal support frame (21).

4. A pedal mechanism for an electric pick vehicle as claimed in claim 3, wherein: the pedal sloping plate (22) is provided with an anti-skid pattern (22-1);

And/or the elastic piece comprises a first elastic piece (23-1) and a second elastic piece (23-2), the first elastic piece (23-1) is higher than the second elastic piece (23-2), the first elastic piece (23-1) is arranged at one end of the pedal support frame (21) close to the rear support frame (62), and the second elastic piece (23-2) is arranged at one end of the pedal support frame (21) far away from the rear support frame (62);

and/or the universal wheel is positioned below one end of the pedal support frame (21) far away from the rear support frame (62).

5. An electric pick car, characterized in that: the electric pick-up car (60) comprises a pedal mechanism for the electric pick-up car according to any one of the claims 1 to 4, wherein the pedal support frame (21) is connected with the rear support frame (62) through a second connecting shaft (62-2).

6. An electric pick vehicle as claimed in claim 5, wherein: the electric pick car (60) further comprises a clamping mechanism (40) for the electric pick power line, the clamping mechanism comprises a connecting plate (41), one end of the connecting plate (41) is connected with the front supporting frame (61), and a supporting pad and a clamping block (43) for clamping the electric pick power line are arranged at the other end of the connecting plate (41).

7. The electric pick vehicle of claim 6, wherein:

The supporting pad is provided with a groove (42-2) for positioning the power line of the electric pick, and the clamping block (43) and the groove (42-2) are matched to clamp the power line of the electric pick;

And/or the connecting plate (41) is detachably connected with the wrench (44);

And/or the support pad is a plastic piece (42-1) or an elastic piece;

And/or one end of the front support frame (61) is linked with one end of the rear support frame (62) through a first connecting shaft (61-1), and the other end of the rear support frame (62) is connected with a rear wheel (63) through a second connecting shaft (62-2).

8. The electric pick vehicle of claim 7, wherein:

The electric pick car (60) further comprises an angle adjusting mechanism (50) for adjusting the included angle between the front support frame (61) and the rear support frame (62), the angle adjusting mechanism (50) comprises an arc dial (51), a fifth installation frame (52) and a connecting rod (53), the arc dial (51) is provided with a plurality of clamping grooves (51-1), and the arc dial (51) is connected below the front support frame (61);

The fifth installation frame (52) is connected to the rear support frame (62), the fifth installation frame (52) is further provided with a fifth U-shaped support (54), one end of the connecting rod (53) penetrates through two sides of the U-shaped support and then is connected with the locking block (55), the locking block (55) corresponds to the clamping groove (51-1), a fifth spring (56) is nested at the position, located in the U-shaped support, of the connecting rod (53), one end, close to the locking block (55), of the fifth spring (56) is connected with the connecting rod (53), and one end, far away from the locking block (55), of the fifth spring (56) is connected with one end, far away from the locking block (55), of the fifth U-shaped support (54);

the connecting wire (57) at the other end of the connecting rod (53) is connected with the trigger (58) at the handle (64-1).

9. An electric pick vehicle as claimed in claim 8, wherein:

The electric pick car (60) further comprises a faucet assembly (64), the faucet assembly (64) comprises a cross rod (64-2), two ends of the cross rod (64-2) are respectively connected with a handle (64-1), the cross rod (64-2) is connected to the top of the front support frame (61) through a sixth U-shaped support (64-3), and a hollowed-out portion (64-4) is arranged between the cross rod (64-2) and the front support frame (61).

10. An electric pick vehicle as claimed in claim 9, wherein:

the bottom of the front end of the front supporting frame (61) is provided with a roller or a universal wheel;

and/or the front support frame (61) is provided with a pressing plate (65) for fixing the connecting wire (57);

And/or a tensioning spring (59) is arranged between the front end of the front supporting frame (61) and the rear supporting frame (62);

And/or the rear wheel (63) is detachably connected with the second connecting shaft (62-2);

And/or the sixth U-shaped bracket (64-3) is detachably connected to the top of the front supporting frame (61);

and/or one end of the connecting plate (41) is detachably connected with the front supporting frame (61);

and/or the arc dial (51) is detachably connected below the front support frame (61);

and/or the fifth mounting bracket (52) is detachably connected to the rear support bracket (62);

And/or the other end of the connecting plate (41) faces obliquely upwards, the horizontal projection length of the other end of the connecting plate (41) is larger than that of the corresponding rear wheel (63), and the horizontal projection length of the other end of the connecting plate (41) is smaller than that of the corresponding handle (64-1);

And/or the other end of the connecting plate (41) is U-shaped, a plastic part (42-1) is arranged on the lower inner side wall of the U-shaped supporting pad, a groove (42-2) is formed in the top of the plastic part (42-1), a fourth mounting hole (41-1) is formed in the upper inner side wall of the U-shaped supporting pad, a butterfly bolt (43-1) is mounted in the fourth mounting hole (41-1), the bottom of the butterfly bolt (43-1) is connected with a clamping block (43), and the clamping block (43) corresponds to the groove (42-2).