A type of cart that facilitates straight-line movement

Abstract

This utility model belongs to the field of trolley technology, and specifically relates to a trolley that facilitates straight-line travel. It includes a balance scooter and a trolley body, connected by a connecting frame. The connecting frame is detachably connected to the trolley body and rotatably connected to the balance scooter. The balance scooter has a positioning groove, and the connecting frame has a positioning element and an elastic element. The elastic element drives the positioning element to engage with the positioning groove, fixing the balance scooter and the connecting frame relatively, thus allowing the trolley to maintain straight-line travel or maintain a certain angle of rotation. Under external force, the positioning element can move relative to the positioning groove, allowing the balance scooter and the connecting frame to rotate relative to each other, thus enabling the trolley to turn flexibly. The purpose of this utility model is to provide a user-friendly trolley that facilitates straight-line travel.

Description

Technical Field

[0001] This utility model belongs to the field of trolley technology, and specifically relates to a trolley that is easy to travel in a straight line. Background Technology

[0002] Electric self-balancing scooters are a new type of transportation tool. Many large indoor spaces such as shopping malls, factories, and logistics companies now use electric self-balancing scooters to drive carts, thereby increasing work efficiency.

[0003] Some trolleys on the market consist of a balance scooter body and a push trolley body, connected by a connecting frame. For user convenience, the balance scooter body or the push trolley body needs to rotate relative to the connecting frame. For example, Chinese utility model patent CN 202223373770.X discloses a material handling trolley, which includes a base frame and a balance scooter connected to the base frame via a connecting assembly. The connecting assembly includes a connecting frame with one end attached to the base frame and the other end snapped onto the balance scooter, a detachable structure on the base frame adapted to the connecting frame, and a buffer structure on the connecting frame near the end of the balance scooter.

[0004] While the above structure facilitates the flexible turning of the material turnover cart, it is inconvenient for users because the cart is often loaded with heavy items and the user needs to keep both hands on the base to keep the cart moving straight. Furthermore, prolonged use can cause hand fatigue and affect the user's normal work. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a convenient trolley that is easy for users to use and can be driven in a straight line.

[0006] The purpose of this utility model is achieved as follows:

[0007] A trolley designed for straight-line travel includes a balance scooter and a trolley body. The balance scooter and the trolley body are connected by a connecting frame, which is detachably connected to the trolley body and rotatably connected to the balance scooter. The balance scooter has a positioning groove, and the connecting frame has a positioning element and an elastic element. The elastic element can drive the positioning element to engage with the positioning groove, thus fixing the balance scooter and the connecting frame relatively, thereby allowing the trolley to maintain straight-line travel or maintain a certain angle of turning. Under the action of external force, the positioning element can move relative to the positioning groove, and the balance scooter and the connecting frame can rotate relative to each other, thus allowing the trolley to turn flexibly.

[0008] The present invention is further configured such that: the positioning component includes a guide rod slidably disposed on the connecting frame, and a positioning roller adapted to the positioning groove is rotatably disposed on the guide rod; the balance vehicle and the connecting frame are controlled to rotate relative to each other, the positioning roller can roll along the surface of the balance vehicle, and the positioning component can engage or disengage from the positioning groove.

[0009] The present invention is further configured such that: the positioning component includes a guide rod slidably disposed on the connecting frame, an adjusting plate is movably disposed on the guide rod, the elastic element is connected to the adjusting plate and the connecting frame respectively, the adjusting plate can control the deformation of the elastic element, or the adjusting plate can be connected to the elastic element at different positions, thereby adjusting the elastic force of the elastic element on the adjusting plate.

[0010] The present invention is further configured such that: the guide rod is provided with a threaded part, and the adjusting plate is threadedly connected to the threaded part; controlling the relative rotation of the adjusting plate and the guide rod can cause the adjusting plate to move axially along the guide rod, thereby causing the elastic element to extend or compress.

[0011] The present invention is further configured such that: the adjusting plate is a nut, and two adjusting plates are provided on the threaded part, the two adjusting plates abut against each other and fix the adjusting plates relative to the guide rod.

[0012] The present invention is further configured such that: two sliding holes are spaced apart on the connecting frame, a sliding part adapted to the two sliding holes is provided on the guide rod, a guide groove is provided on the side of the sliding hole, and a guide block adapted to the guide groove is provided on the guide rod.

[0013] The present invention is further configured such that: the balance vehicle includes a detachably connected balance vehicle body and a positioning plate, the positioning groove is provided on the positioning plate, and guide surfaces are provided on both sides of the positioning groove, the positioning component is controlled to disengage from the positioning groove, and the positioning component can move along the guide surfaces.

[0014] The present invention is further configured such that: the balance vehicle is provided with a limiting groove, the connecting frame is provided with a limiting part, the limiting part passes through the limiting groove, and the rotation range of the balance vehicle and the connecting frame can be limited by the limiting groove.

[0015] The present invention is further configured such that: the trolley body is provided with a horizontally extending connecting crossbar, the connecting frame is provided with a connecting groove, the side of the connecting groove is provided with an opening, the connecting crossbar can pass through the opening and enter the connecting groove, and a locking member is rotatably connected to the connecting frame via a hinge shaft, the hinge shaft is provided on the side of the connecting groove away from the opening, and the locking member is provided with a limiting part, the limiting part can be flipped from the upper side of the connecting groove to the connecting groove or the opening side under the action of gravity, thereby preventing the connecting crossbar from detaching from the connecting groove.

[0016] The present invention is further configured such that: the connecting frame is provided with an auxiliary support wheel, which can support the connecting frame together with the balance vehicle; the trolley body is located in front of the balance vehicle; the connecting groove is located on the front side of the connecting frame; and the opening is located at the front end of the connecting groove; the control locking member is moved away from the connecting groove, and the movement of the connecting frame is controlled by the balance vehicle; the connecting crossbar can cooperate with or disengage from the connecting groove.

[0017] The advantages of this utility model compared to the prior art are:

[0018] 1. In this utility model, the elastic element drives the positioning element to cooperate with the positioning groove to fix the balance cart and the connecting frame relatively, so that the cart can keep moving in a straight line or keep turning, which facilitates the cart to make straight-line movement or specific turning movement. This structure can reduce the force exerted by the user during use, making it convenient for the user to use the cart for a long time. In addition, under the action of external force, the positioning element can move relative to the positioning groove, which makes it convenient for the user to control the steering of the cart and make it convenient for the user to use.

[0019] 2. The positioning rollers in this utility model reduce friction between the positioning component and the balance scooter during use, making it easier for the user to control the scooter's direction and to control the positioning component to engage or disengage from the positioning groove. This makes it convenient for the user to use, and the structure also helps to reduce noise from the scooter during use and extends the service life of the positioning component and the balance scooter. The adjustment plate allows the user to adjust the elastic force of the elastic component on the adjustment plate as needed, making it convenient for the user to use the scooter.

[0020] 3. The threaded part in this utility model facilitates stepless adjustment of the adjustment plate by the user, and the adjustment plate does not need to be disassembled relative to the guide rod during the adjustment process, which facilitates flexible adjustment by the user; the two adjustment parts have a simple structure, which facilitates the relative fixation of the adjustment plate and the guide rod, making it convenient for the user to use and control; the two spaced sliding holes facilitate the stable sliding of the guide rod, preventing the guide rod from shaking during use and causing the trolley to turn unexpectedly, which is convenient for the user; the guide groove and guide block facilitate the positioning and installation of the guide rod and the connecting frame, and prevent the relative rotation of the guide rod and the connecting frame during use from affecting the connection and cooperation between the positioning parts and the positioning groove.

[0021] 4. The detachable positioning plate in this utility model facilitates the production and processing of the positioning groove and guide surface. Moreover, this structure allows manufacturers to flexibly replace the positioning plate as needed or install positioning plates of different specifications on the balance scooter body, which is convenient for the maintenance and assembly of the scooter. The setting of the limiting swing groove and the limiting part can limit the maximum rotation angle of the scooter and avoid accidents caused by excessive rotation angle of the scooter.

[0022] 5. In this utility model, since the locking component is rotatably mounted on the connecting frame via a hinge shaft, and the hinge shaft is located on the side of the connecting groove away from the opening, the locking component needs to be flipped upwards when the connecting groove and the connecting crossbar are disassembled relative to each other. However, during use, when the connecting crossbar abuts against the limiting part, the connecting crossbar cannot drive the limiting part to flip upwards, thereby preventing the connecting groove and the connecting crossbar from accidentally disengaging during use. This is beneficial for the stable connection of the trolley, facilitates the use of the trolley, and reduces the occurrence of accidents. The auxiliary support wheels allow the connecting frame and the balance scooter to form three or more support wheels, making it convenient for users to move the connecting frame and the balance scooter independently. This structure can also prevent the connecting groove from swinging up and down during use, making it easy for the connecting crossbar to engage or disengage with the connecting groove, and facilitating the quick assembly and disassembly of the connecting frame and the trolley body. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is an exploded view of the present invention;

[0025] Figure 3 This is a schematic diagram of the connection structure between the positioning component and the positioning plate when the trolley is turned according to this utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the self-balancing scooter in this utility model;

[0027] Figure 5 This is a schematic diagram of the installation structure of the positioning plate on the connecting seat in this utility model;

[0028] Figure 6 This is a schematic diagram of the positioning plate in this utility model;

[0029] Figure 7 This is a schematic diagram of the installation structure of the locking component, auxiliary support wheel, and positioning component on the connecting frame in this utility model;

[0030] Figure 8 This is a cross-sectional view of the mounting structure of the positioning component on the connecting frame in this utility model;

[0031] Figure 9 This is an exploded view of the installation structure of the positioning component on the connecting frame in this utility model;

[0032] Figure 10 This is a schematic diagram of the guide rod structure in this utility model;

[0033] Figure 11 This is a schematic diagram of the connecting crossbar in this utility model.

[0034] The labels in the diagram mean: 1-Side scooter; 11-Side scooter body; 12-Positioning plate; 111-Connecting seat;

[0035] 112-Limiting swing groove; 113-Hinge rod; 121-Positioning groove; 122-Guide surface; 123-Fixing hole;

[0036] 2-Cart body; 21-Connecting crossbar; 22-Arc-shaped side wall; 23-Limiting flange; 3-Connecting frame; 31-Connecting groove; 32-Mounting protrusion; 33-Hinge shaft; 34-Limiting part; 321-Sliding hole; 322-Guide groove; 4-Locking part; 5-Auxiliary support wheel; 6-Positioning part; 61-Guide rod; 62-Positioning roller; 63-Guide block; 611-Sliding part; 612-Threaded part; 613-Rotating groove; 614-Keyway; 7-Elastic element; 8-Adjusting plate. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0038] See Figures 1 to 11 As shown, a trolley designed for straight-line travel includes a balance scooter 1 and a trolley body 2. The balance scooter 1 and the trolley body 2 are connected by a connecting frame 3. The connecting frame 3 is detachably connected to the trolley body 2 and rotatably connected to the balance scooter 1. The balance scooter 1 is provided with a positioning groove 121, and the connecting frame 3 is provided with a positioning element 6 and an elastic element 7. The elastic element 7 can drive the positioning element 6 to engage with the positioning groove 121, thereby fixing the balance scooter 1 and the connecting frame 3 relative to each other, thus allowing the trolley to maintain straight-line travel or maintain a certain angle of turning. Under the action of external force, the positioning element 6 can move relative to the positioning groove 121. The balance scooter 1 and the connecting frame 3 can rotate relative to each other, allowing the scooter to turn flexibly. In this structure, the elastic element 7 drives the positioning element 6 to cooperate with the positioning groove 121 to fix the balance scooter 1 and the connecting frame 3 relative to each other, so that the scooter can keep moving in a straight line or keep turning. This structure can reduce the force exerted by the user during use, making it convenient for the user to use and allowing the user to use the scooter for a long time. In addition, under the action of external force, the positioning element 6 can move relative to the positioning groove 121, making it convenient for the user to control the direction of the scooter.

[0039] In this invention, the positioning component 6 can directly abut against the balance scooter 1. During the relative rotation of the balance scooter 1 and the connecting frame 3, the positioning component 6 slides and rubs against the balance scooter 1. Preferably, the positioning component 6 includes a guide rod 61 slidably disposed on the connecting frame 3, and a positioning roller 62 adapted to the positioning groove 121 is rotatably disposed on the guide rod 61. By controlling the relative rotation of the balance scooter 1 and the connecting frame 3, the positioning roller 62 can roll along the surface of the balance scooter 1, allowing the positioning component 6 to engage or disengage from the positioning groove 121. The positioning roller 62 helps reduce the friction between the positioning component 6 and the balance scooter 1 during use, making it easier for the user to control the direction of the scooter and to control the engagement or disengagement of the positioning component 6 from the positioning groove 121. This facilitates user use, and the structure also helps to reduce the noise emitted by the scooter during use and extends the service life of the positioning component 6 and the balance scooter 1.

[0040] The positioning component 6 includes a guide rod 61 slidably mounted on the connecting frame 3. An adjusting plate 8 is movably mounted on the guide rod 61. An elastic element 7 is connected to the adjusting plate 8 and the connecting frame 3 respectively. The adjusting plate 8 can control the deformation of the elastic element 7. Alternatively, the adjusting plate 8 can be connected to the elastic element 7 at different positions to adjust the elastic force of the elastic element 7 on the adjusting plate 8. The setting of the adjusting plate 8 is beneficial for users to adjust the elastic force of the elastic element 7 on the adjusting plate 8 as needed, making it convenient for users to use the trolley.

[0041] In this invention, the control adjustment plate 8 and the elastic element 7 are connected at different positions, which can change the effective length of the elastic element 7 during use, thereby changing the elastic force of the elastic element 7 on the adjustment plate 8 during use. Preferably, the adjustment plate 8 changes the initial elastic force of the elastic element 7 by controlling the extension or contraction of the elastic element 7, thereby changing the elastic force of the elastic element 7 during use.

[0042] The guide rod 61 is provided with a threaded part 612, and the adjusting plate 8 is threadedly connected to the threaded part 612. Controlling the relative rotation of the adjusting plate 8 and the guide rod 61 can make the adjusting plate 8 move along the axial direction of the guide rod 61, thereby causing the elastic element 7 to extend or compress. The threaded part 612 facilitates stepless adjustment of the adjusting plate 8 by the user, and the adjusting plate 8 does not need to be disassembled relative to the guide rod 61 during the adjustment process, which facilitates flexible adjustment of the adjusting plate 8 by the user.

[0043] In this embodiment, the adjusting plate 8 is a nut, and two adjusting plates 8 are provided on the threaded part 612. The two adjusting plates 8 abut against each other and fix the adjusting plates 8 relative to the guide rod 61. The structure of the two adjusting components is simple, which facilitates the relative fixation of the adjusting plates 8 and the guide rod 61 and makes it convenient for users to use and control. The front end of the guide rod 61 is provided with a rotating groove 613, and the positioning roller 62 is rotatably disposed in the rotating groove 613.

[0044] The connecting frame 3 is provided with two sliding holes 321 spaced apart. The guide rod 61 is provided with sliding parts 611 that are adapted to the two sliding holes 321 respectively. The sliding holes 321 are provided with guide grooves 322 on their sides. The guide rod 61 is provided with guide blocks 63 that are adapted to the guide grooves 322. The two spaced sliding holes 321 facilitate the stable sliding of the guide rod 61, preventing the guide rod 61 from shaking during use and causing the trolley to turn unexpectedly, which is convenient for users. The guide grooves 322 and guide blocks 63 facilitate the positioning and installation of the guide rod 61 and the connecting frame 3, and prevent the relative rotation of the guide rod 61 and the connecting frame 3 during use from affecting the connection and cooperation between the positioning part 6 and the positioning groove 121.

[0045] The connecting frame 3 is provided with two mounting protrusions 32 at intervals. Two sliding holes 321 are coaxially arranged and respectively arranged in the two mounting protrusions 32. The elastic element 7 and the adjusting plate 8 are arranged between the two mounting protrusions 32. The elastic element 7 is a cylindrical compression spring. The cylindrical compression spring is sleeved on the guide rod 61. One end of the cylindrical compression spring abuts against the mounting protrusion 32, and the other end of the cylindrical compression spring abuts against the adjusting plate 8.

[0046] In this embodiment, the sliding part 611 is provided with a keyway 614 on its side, and the guide block 63 is detachably disposed in the keyway.

[0047] The self-balancing scooter 1 includes a detachably connected self-balancing scooter body 11 and a positioning plate 12. A positioning groove 121 is provided on the positioning plate 12, and guide surfaces 122 are provided on both sides of the positioning groove 121. The positioning component 6 is disengaged from the positioning groove 121 and can move along the guide surfaces 122. The detachably connected positioning plate 12 facilitates the production and processing of the positioning groove 121 and the guide surfaces 122. Moreover, this structure allows the manufacturer to flexibly replace the positioning plate 12 as needed or install positioning plates 12 of different specifications on the self-balancing scooter body 11, which facilitates the maintenance and assembly production of the scooter.

[0048] The self-balancing scooter 1 described in this utility model is provided with a limiting swing groove 112, and the connecting frame 3 is provided with a limiting part 34. The limiting part 34 passes through the limiting swing groove 112. The limiting swing groove 112 can limit the rotation range of the self-balancing scooter 1 and the connecting frame 3. The setting of the limiting swing groove 112 and the limiting part 34 can limit the maximum rotation angle of the scooter and avoid accidents caused by excessive rotation angle of the scooter. The self-balancing scooter body 11 is provided with a connecting seat 111, and the limiting swing groove 112 is set on the connecting seat 111.

[0049] In this embodiment, a hinge rod 113 is provided on the connecting seat 111. The hinge rod 113 passes through the limiting swing groove 112. The connecting frame 3 is rotatably connected to the connecting seat 111 through the hinge rod 113. The positioning plate 12 is adapted to the limiting swing groove 112. The positioning plate 12 is provided with a fixing hole 123 adapted to the hinge rod 113. The hinge rod 113 passes through the fixing hole 123 and fixes the positioning plate 12 in the limiting swing groove 112.

[0050] The trolley body 2 is provided with a laterally extending connecting crossbar 21. A connecting frame 3 is provided with a connecting groove 31, and an opening is provided on the side of the connecting groove 31. The connecting crossbar 21 can pass through the opening and enter the connecting groove 31. A locking member 4 is rotatably connected to the connecting frame 3 via a hinge shaft 33. The hinge shaft 33 is located on the side of the connecting groove 31 away from the opening, and the locking member 4 can be flipped from the top of the connecting groove 31 to the side of the connecting groove 31 or the opening under the action of gravity, thereby preventing the connecting crossbar 21 from detaching from the connecting groove 31. In this structure… Since the locking element 4 is rotatably mounted on the connecting frame 3 via the hinge shaft 33, and the hinge shaft 33 is located on the side of the connecting groove 31 away from the opening, the locking element 4 needs to be flipped upward when the connecting groove 31 and the connecting crossbar 21 are disassembled relative to each other. However, during use, when the connecting crossbar 21 abuts against the locking element 4, the connecting crossbar 21 cannot drive the locking element 4 to flip upward, thereby preventing the connecting groove 31 and the connecting crossbar 21 from accidentally disengaging during use. This is beneficial for the stable connection of the trolley, facilitates the use of the trolley, and reduces the occurrence of accidents.

[0051] The hinge shaft 33 is located on one side of the opening in the horizontal direction, or the hinge shaft 33 is located below the opening in the horizontal direction. This structure can prevent the locking member 4 from flipping upward due to the connecting crossbar 21, which is conducive to the stable connection between the connecting groove 31 and the connecting crossbar 21 and improves the safety of the trolley.

[0052] Preferably, the connecting crossbar 21 has an arc-shaped sidewall 22. The connecting crossbar 21 is guided into the connecting groove 31 through the arc-shaped sidewall 22. The arc-shaped sidewall 22 facilitates the quick connection and engagement of the connecting crossbar 21 and the connecting groove 31, making it convenient for the connecting frame 3 and the trolley body 2 to be quickly installed and for the user to use.

[0053] In this embodiment, both ends of the arc-shaped sidewall 22 are provided with limiting protrusions 23. The limiting protrusions 23 can abut against the connector and limit the range of motion of the connecting groove 31 along the extension direction of the connecting crossbar 21. The limiting protrusions 23 provided at both ends of the arc-shaped sidewall 22 can limit the range of motion of the connecting groove 31 along the extension direction of the connecting crossbar 21, reduce the shaking of the connecting frame 3 and the trolley body 2 during use, and facilitate the stable connection between the connecting frame 3 and the trolley body 2.

[0054] The longitudinal width of the opening is greater than the longitudinal height of the connecting crossbar 21. This structure facilitates the connection and cooperation between the connecting frame 3 and the trolley body 2 with connecting crossbars 21 of different heights, thereby enabling the connecting frame 3 to cooperate with trolley bodies 2 of different specifications, facilitating the flexible assembly and use of the trolley. In addition, this structure facilitates the quick connection and cooperation between the connecting crossbar 21 and the connecting groove 31, making it convenient for the connecting frame 3 and the trolley body 2 to be installed quickly and convenient for the user.

[0055] The connecting frame 3 is equipped with auxiliary support wheels 5, which can support the connecting frame 3 together with the balance scooter 1. The scooter body 2 is located in front of the balance scooter 1, and the connecting groove 31 is located on the front side of the connecting frame 3 with an opening at the front end of the connecting groove 31. The control locking member 4 is away from the connecting groove 31 and controls the movement of the connecting frame 3 through the balance scooter 1. The connecting crossbar 21 can engage or disengage from the connecting groove 31. The auxiliary support wheels 5 enable the connecting frame 3 and the balance scooter 1 to form three or more support wheels, making it convenient for users to move the connecting frame 3 and the balance scooter 1 independently. This structure can prevent the connecting groove 31 from swinging up and down during use, and it is convenient for the connecting crossbar 21 to engage or disengage from the connecting groove 31, facilitating the quick assembly and disassembly of the connecting frame 3 and the scooter body 2.

[0056] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A trolley for easy straight-line movement, comprising a balance scooter (1) and a trolley body (2), wherein the balance scooter (1) and the trolley body (2) are connected by a connecting frame (3), characterized in that: The connecting frame (3) is detachably connected to the trolley body (2), and the connecting frame (3) is rotatably connected to the balance trolley (1). The balance trolley (1) is provided with a positioning groove (121), and the connecting frame (3) is provided with a positioning component (6) and an elastic component (7). The elastic component (7) can drive the positioning component (6) to cooperate with the positioning groove (121) and fix the balance trolley (1) and the connecting frame (3) relatively, so that the trolley can maintain straight-line travel or maintain a certain angle of turning. Under the action of external force, the positioning component (6) can move relative to the positioning groove (121) and make the balance trolley (1) and the connecting frame (3) rotate relative to each other, so that the trolley can turn flexibly.

2. The trolley for easy straight-line movement according to claim 1, characterized in that: The positioning component (6) includes a guide rod (61) slidably mounted on the connecting frame (3), and a positioning roller (62) adapted to the positioning groove (121) is rotatably mounted on the guide rod (61); the balance vehicle (1) is controlled to rotate relative to the connecting frame (3), the positioning roller (62) can roll along the surface of the balance vehicle (1), and the positioning component (6) can engage or disengage from the positioning groove (121).

3. A trolley for easy straight-line movement according to claim 1, characterized in that: The positioning component (6) includes a guide rod (61) slidably disposed on the connecting frame (3), an adjusting plate (8) is movably disposed on the guide rod (61), and an elastic element (7) is connected to the adjusting plate (8) and the connecting frame (3) respectively. The adjusting plate (8) can control the deformation of the elastic element (7), or the adjusting plate (8) can be connected to the elastic element (7) at different positions, thereby adjusting the elastic force of the elastic element (7) on the adjusting plate (8).

4. A trolley for easy straight-line movement according to claim 3, characterized in that: The guide rod (61) is provided with a threaded part (612), and the adjusting plate (8) is threadedly connected to the threaded part (612). Controlling the relative rotation of the adjusting plate (8) and the guide rod (61) can make the adjusting plate (8) move axially along the guide rod (61), thereby causing the elastic element (7) to extend or compress.

5. A trolley for easy straight-line movement according to claim 4, characterized in that: The adjusting plate (8) is a nut, and two adjusting plates (8) are provided on the threaded part (612). The two adjusting plates (8) abut against each other and fix the adjusting plate (8) relative to the guide rod (61).

6. A trolley for easy straight-line travel according to claim 2, 3, 4, or 5, characterized in that: The connecting frame (3) is provided with two sliding holes (321) spaced apart. The guide rod (61) is provided with sliding parts (611) that are adapted to the two sliding holes (321). The sliding holes (321) are provided with guide grooves (322) on the side. The guide rod (61) is provided with guide blocks (63) that are adapted to the guide grooves (322).

7. A trolley for easy straight-line movement according to claim 6, characterized in that: The self-balancing vehicle (1) includes a self-balancing vehicle body (11) and a positioning plate (12) that can be detachably connected. The positioning groove (121) is set on the positioning plate (12), and the positioning groove (121) is provided with guide surfaces (122) on both sides. The control positioning component (6) is disengaged from the positioning groove (121), and the positioning component (6) can move along the guide surface (122).

8. A trolley for easy straight-line movement according to claim 1, characterized in that: The self-balancing vehicle (1) is provided with a limiting groove (112), and the connecting frame (3) is provided with a limiting part (34). The limiting part (34) passes through the limiting groove (112), and the rotation range of the self-balancing vehicle (1) and the connecting frame (3) can be limited by the limiting groove (112).

9. A trolley for easy straight-line travel according to claim 1, 2, 3, 4, 5, 7, or 8, characterized in that: The trolley body (2) is provided with a horizontally extending connecting crossbar (21), and the connecting frame (3) is provided with a connecting groove (31). The connecting groove (31) has an opening on its side. The connecting crossbar (21) can pass through the opening and enter the connecting groove (31). The connecting frame (3) is rotatably connected with a locking member (4) through a hinge shaft (33). The hinge shaft (33) is located on the side of the connecting groove (31) away from the opening, and the locking member (4) is provided with a limiting part (34). The limiting part (34) can be flipped from the upper side of the connecting groove (31) to the connecting groove (31) or the opening side under the action of gravity, thereby preventing the connecting crossbar (21) from coming out of the connecting groove (31).

10. A trolley for easy straight-line movement according to claim 9, characterized in that: The connecting frame (3) is provided with an auxiliary support wheel (5), which can support the connecting frame (3) together with the balance vehicle (1). The trolley body (2) is located in front of the balance vehicle (1), the connecting groove (31) is located on the front side of the connecting frame (3), and the opening is located at the front end of the connecting groove (31). The control locking piece (4) is away from the connecting groove (31), and the movement of the connecting frame (3) is controlled by the balance vehicle (1). The connecting crossbar (21) can cooperate with or disengage from the connecting groove (31).

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