Folding frame, luggage case and hand buggy

Abstract

The folding frame comprises a folding frame main body, the folding frame main body comprises a back plate, a connecting beam and a handrail frame, one end of the connecting beam is hinged to the side wall of the back plate, the other end of the connecting beam is horizontally hinged to a wheel frame, and an electric rolling wheel is installed on the wheel frame. The folding frame body has a folding state and an unfolding state and is very convenient to use, the folding state and the unfolding state of the folding frame body can be freely switched through the design of the spring bolt and the fixing mechanism, and the current state can be kept all the time when the folding state and the unfolding state are not switched; the folding frame body can be used in cooperation with the luggage box body or the hand buggy body, and when the folding frame body is in the folding state, the luggage box body or the hand buggy body can be used as a luggage box or a hand buggy. When the folding frame main body is in the unfolded state, the folding frame main body can be matched with the luggage box body or the hand buggy main body to be used as a scooter, so that physical strength can be saved for a user, and various use requirements can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of handcarts, in particular to a folding frame, a luggage case and a handcart. Background Art

[0002] A suitcase, also known as a travel case or a trolley case, is a box that is carried when going out to store items. It is a type of luggage. Usually, a suitcase is used to store clothes and personal care products needed for the journey. A trolley is a transport vehicle that is pushed and pulled by manpower. It is the ancestor of all vehicles. Although the material handling technology of trolleys is constantly developing, trolleys are still used as indispensable transport tools. Trolleys and suitcases are both commonly used tools for transporting items in people's daily lives.

[0003] However, both suitcases and trolleys are usually transported by manpower, which can easily cause fatigue after long-term use, affecting the efficiency of transportation, and the functions are also very simple. Although electric suitcases are available on the market, which are improved on the basis of traditional suitcases and made rideable to reduce the burden of carrying the suitcases, their power mechanism and suitcases are usually an integral whole, and it is not easy to replace the parts after they are damaged. In addition, suitcases are usually not used frequently, which easily leads to waste of resources. In order to better solve this problem, we propose a folding rack, a suitcase and a trolley. Utility Model Content

[0004] The utility model aims to solve the shortcomings of the prior art and provides a folding frame, a luggage case and a handcart.

[0005] In the first aspect, in order to solve the above technical problems, the utility model provides a folding frame, including a folding frame body, the folding frame body including a back plate, a connecting beam and a hand frame, one end of the connecting beam is hinged to the side wall of the back plate, the other end of the connecting beam is horizontally hinged to be provided with a wheel frame, an electric roller is installed on the wheel frame, a second accommodating groove is opened on the hand frame, and the second accommodating groove matches the connecting beam, a fork frame is provided at the bottom of the hand frame, and the ends of the fork frame are respectively connected to the rotating shafts on both sides of the wheel frame;

[0006] A support rod is hingedly provided on the side wall of the connecting beam, and a T-shaped slider is hingedly provided on the end of the support rod. T-shaped sliding grooves are provided on the back plate at positions opposite to the T-shaped sliders, and the T-shaped sliders are slidably provided in the corresponding T-shaped sliding grooves. A locking tongue is provided at the top of the T-shaped slider, and a fixing mechanism is installed in the T-shaped sliding groove and at the top. A locking tongue is provided on the inner side of the second accommodating groove of the handrail and at a position opposite to the fixing mechanism, and the locking tongues are matched with the corresponding fixing mechanisms.

[0007] In a feasible implementation, a pull rod is slidably arranged inside the handrail frame. Handles are fixedly arranged on the side walls on both sides of the pull rod. The connecting beam adopts a hollow structure, and a storage battery is arranged inside the connecting beam. The storage battery is electrically connected to the electric rollers. A switch and a control knob are arranged on the handle, and the switch is electrically connected to the storage battery, and the control knob is electrically connected to the electric rollers.

[0008] In a feasible implementation, for the folding luggage case according to the claim, the fixing mechanism includes a sliding seat, a swing arm and a hook. A cavity is formed inside the back plate. A limiting slide bar and a rotating shaft are horizontally arranged inside the cavity of the back plate. A strip-shaped hole is formed on the sliding seat, and the strip-shaped hole is slidably sleeved on the limiting slide bar. A plurality of springs are connected between the inner wall of the strip-shaped hole and the limiting slide bar. An arc-shaped groove is formed on the sliding seat, and a swing arm is rotatably arranged on the rotating shaft. An arc-shaped block is fixedly arranged at one end of the swing arm, and the arc-shaped block is located inside the arc-shaped groove. A hook is fixed at the other end of the swing arm. A pull ring is fixedly arranged inside the cavity on the swing arm. The locking tongue is matched with the hook. The pull ring is connected with a T-shaped handle through a pull rope, and the handle is inserted and arranged at the top of the back plate.

[0009] In a feasible implementation, pedals are fixedly arranged on the side walls on both sides of the wheel frame, and a reinforcing rod is fixedly arranged between the support rods.

[0010] In a second aspect, the present application further provides a luggage case, which adopts the above-mentioned folding frame. The folding frame body is installed on the luggage case body, and first rollers are installed at the four corners of the bottom of the luggage case body.

[0011] In a feasible implementation, a storage box is fixedly arranged on the top of the luggage case body. A groove is formed at the connection part of the luggage case body where the folding frame body is located, and the outer contour of the handrail frame matches the groove.

[0012] In a feasible implementation, first rectangular tubes are vertically arranged on both sides inside the groove. A plurality of first limiting holes are formed on the first rectangular tubes. The first limiting holes are designed with a smaller upper part and a larger lower part. Big cap nails are respectively installed at the relative positions corresponding to the first limiting holes on the side walls of both sides of the back plate. A through groove is formed inside the groove on the luggage case body. A first baffle is hingedly arranged inside the through groove, and a torsion spring with a torsion effect on the first baffle is installed at the hinge. A first limiting plate is installed on the first baffle.

[0013] In a feasible implementation, a first accommodation groove for accommodating the electric rollers is formed below the groove on the luggage case body.

[0014] In a feasible implementation, the first roller is a universal wheel. After the folding frame is unfolded, the luggage body tilts, and the roller on the ground of the luggage body deflects along the force direction and turns to roll along the force direction.

[0015] In a third aspect, the present application further provides a trolley, which adopts the above folding frame. The folding frame body is installed on the trolley body, and a second roller is installed at the bottom of the trolley body.

[0016] In a feasible implementation, a gantry frame is provided on the trolley body. The outer contour of the back plate matches the gantry frame. A second rectangular tube is fixedly provided on the inner wall of the gantry frame. A plurality of second limiting holes are opened on the second rectangular tube. The second limiting holes are designed with a smaller upper part and a larger lower part. Big cap screws are respectively installed on the side walls on both sides of the back plate at the relative positions corresponding to the second limiting holes. A second baffle is hingedly provided at the bottom inside the gantry frame, and a torsion spring with a torsion acting on the second baffle is installed at the hinge. A second limiting plate is installed on the second baffle.

[0017] In a feasible implementation, a load-carrying bucket that can rotate 90 degrees is hinged at the bottom side of the trolley body, and a third receiving groove for accommodating the electric roller is opened at the bottom of the gantry frame;

[0018] In a feasible implementation, a retractable seat cushion is hingedly provided at the top of the gantry frame;

[0019] In a feasible implementation, a stop block is fixedly provided on the side wall of the gantry frame below the retractable seat cushion.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] 1. In the present utility model, the folding frame body has two states: folded and unfolded, which is very convenient to use. The design of the lock tongue and the fixing mechanism can make the folding state and the unfolded state of the folding frame body switch freely, and can always maintain the current state when not switching states, with high reliability and high safety.

[0022] 2. In the present utility model, the folding frame body can be used in cooperation with the luggage body or the trolley body respectively. When the folding frame body is in the folded state, the luggage body or the trolley body can be used as a luggage or a trolley respectively; when the folding frame body is in the unfolded state, in cooperation with the luggage body or the trolley body, it can be used as a scooter respectively, which can not only save physical strength for the user, but also meet various usage requirements.

[0023] 3. In the present utility model, regardless of whether the folding frame body is installed on the trolley body or the luggage case body, when the folding frame body is unfolded, the trolley body or the luggage case body is in an inclined state, and the whole forms a triangular state with the folding frame body, which has good stability. Moreover, at this time, the folding frame body, the trolley body or the luggage case body have a total of three wheels touching the ground, making it not easy to topple over, with a low driving difficulty and being convenient for users to operate.

[0024] 4. In the present utility model, the connection between the folding frame and the luggage case body or the trolley body is very convenient without the assistance of other tools. Moreover, when the luggage case body is idle, the folding frame on the luggage case body can be disassembled and installed on the trolley body for use; conversely, when the trolley body is idle, the folding frame on the trolley body can be disassembled and installed on the luggage case body for use, and the use is very flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a perspective view of the folding frame of the present utility model in the retracted state;

[0026] Figure 2 is a front view of the folding frame of the present utility model in the retracted state;

[0027] Figure 3 is a perspective view of the folding frame of the present utility model in the unfolded state;

[0028] Figure 4 is a perspective view of the folding frame of the present utility model in the unfolded state;

[0029] Figure 5 is a front view of the folding frame of the present utility model in the unfolded state;

[0030] Figure 6 is a cross-sectional view of the back plate of the present utility model;

[0031] Figure 7 For the present utility model Figure 6 is a partial enlarged structural schematic diagram of A;

[0032] Figure 8 is a perspective view of the luggage case body and the folding frame of the present utility model in the unfolded state;

[0033] Figure 9 is a front view of the luggage case body and the folding frame of the present utility model in the unfolded state;

[0034] Figure 10 is a front view of the luggage case body and the folding frame of the present utility model in the retracted state;

[0035] Figure 11 is a perspective view of the luggage case body and the folding frame of the present utility model in the retracted state;

[0036] Figure 12 It is a perspective view of the luggage body of the present utility model;

[0037] Figure 13 It is a front view of the luggage body of the present utility model;

[0038] Figure 14 It is a schematic structural view of the first baffle on the luggage body of the present utility model;

[0039] Figure 15 It is a perspective view of the unfolded state of the trolley main body and the folding frame of the present utility model Figure 1 ;

[0040] Figure 16 It is a front view of the unfolded state of the trolley main body and the folding frame of the present utility model;

[0041] Figure 17 It is a perspective view of the unfolded state of the trolley main body and the folding frame of the present utility model Figure 2 ;

[0042] Figure 18 It is a perspective view of the folded state of the trolley main body and the folding frame of the present utility model;

[0043] Figure 19 It is a perspective view of the trolley main body of the present utility model Figure 1 ;

[0044] Figure 20 It is a perspective view of the trolley main body of the present utility model Figure 2 .

[0045] In the figure: 1. Luggage body; 2. Storage box; 3. First roller; 4. Groove; 5. First rectangular tube; 501. First limiting hole; 6. First receiving groove; 7. Through groove; 8. First baffle; 801. First limiting plate; 9. Folding frame main body; 10. Back plate; 1001. Cavity; 1002. Big rivet; 11. Connecting beam; 12. Handrail; 13. Second receiving groove; 14. Support rod; 15. T-shaped sliding groove; 16. T-shaped sliding block; 17. Lock tongue; 18. Reinforcing rod; 19. Fixing mechanism; 1901. Slide seat; 1902. Strip-shaped hole; 1903. Limiting slide bar; 1904. Spring; 1905. Arc-shaped groove; 1906. Swing arm; 1907. Hook; 1908. Arc-shaped block; 1909. Rotating shaft; 1910. Pulling ring; 20. Pull handle; 21. Pulling rope; 22. Electric roller; 23. Wheel frame; 24. Footrest; 25. Pull rod; 26. Handle; 27. Fork frame; 28. Trolley main body; 29. Door-shaped frame; 2901. Stopper; 30. Second roller; 31. Loading bucket; 32. Foldable cushion; 33. Second rectangular tube; 3301. Second limiting hole; 34. Third receiving groove; 35. Second baffle; 3501. Second limiting plate. Detailed implementation manners

[0046] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0047] Embodiment 1:

[0048] Referring to Figures 1 - 7 , a folding rack includes a folding rack main body 9. The folding rack main body 9 includes a backboard 10, a connecting beam 11, and a handrail 12. One end of the connecting beam 11 is hinged to the side wall of the backboard 10, and the other end of the connecting beam 11 is horizontally hinged with a wheel rack 23. An electric roller 22 is installed on the wheel rack 23. A second accommodation groove 13 is formed on the handrail 12, and the second accommodation groove 13 matches the connecting beam 11. A fork 27 is provided at the bottom of the handrail 12, and the ends of the fork 27 are respectively connected to the rotating shafts on both sides of the wheel rack 23;

[0049] A support rod 14 is hinged on the side wall of the connecting beam 11. T-shaped sliders 16 are hinged at the ends of the support rod 14. T-shaped chutes 15 are respectively formed on the backboard 10 at the positions opposite to the T-shaped sliders 16, and the T-shaped sliders 16 are respectively slidably arranged in the corresponding T-shaped chutes 15. A locking tongue 17 is provided at the top of the T-shaped slider 16. A fixing mechanism 19 is installed at the top in the T-shaped chute 15. Locking tongues 17 are provided on the inner side of the second accommodation groove 13 of the handrail 12 at the positions opposite to the fixing mechanism 19, and the locking tongues 17 respectively match the corresponding fixing mechanisms 19.

[0050] A pull rod 25 is slidably arranged in the handrail 12. Handles 26 are fixedly arranged on the side walls on both sides of the pull rod 25. The connecting beam 11 adopts a hollow structure. A storage battery is arranged in the connecting beam 11. The storage battery is electrically connected to the electric roller 22. A switch and a control knob are provided on the handle 26, the switch is electrically connected to the storage battery, and the control knob is electrically connected to the electric roller 22.

[0051] The fixing mechanism 19 includes a sliding seat 1901, a swing arm 1906 and a hook 1907. A cavity 1001 is formed inside the back plate 10. A limiting slide bar 1903 and a rotating shaft 1909 are horizontally arranged inside the cavity 1001 of the back plate 10. A strip-shaped hole 1902 is formed on the sliding seat 1901, and the strip-shaped hole 1902 is slidably sleeved on the limiting slide bar 1903. A plurality of springs 1904 are connected between the inner wall of the strip-shaped hole 1902 and the limiting slide bar 1903. An arc-shaped groove 1905 is formed on the sliding seat 1901. A swing arm 1906 is rotatably arranged on the rotating shaft 1909. An arc-shaped block 1908 is fixedly arranged at one end of the swing arm 1906, and the arc-shaped block 1908 is located inside the arc-shaped groove 1905. A hook 1907 is fixed at the other end of the swing arm 1906. A pull ring 1910 is fixedly arranged on the swing arm 1906 inside the cavity 1001. The locking tongue 17 is matched with the hook 1907. The pull ring 1910 is connected with a T-shaped handle 20 through a pull rope 21, and the handle 20 is inserted and arranged at the top of the back plate 10.

[0052] Pedals 24 are fixedly arranged on the side walls on both sides of the wheel carrier 23, and a reinforcing bar 18 is fixedly arranged between the support rods 14.

[0053] In this application, the folding frame main body 9 has two states of folding and unfolding, which is very convenient to use. When the folding frame main body 9 needs to be unfolded, the fixing mechanism 19 needs to be opened. By pulling up the handle 20, one side of the arc-shaped block 1908 of the swing arm 1906 moves downward under the drive of the pull rope 21 to squeeze the sliding seat 1901 to move backward, and at the same time the hook 1907 moves upward, so as to release the limitation on the locking tongue 17 on the handrail frame 12;

[0054] Then move the locking tongue 17 on the T-shaped slider 16 upward to the hook 1907 of the upper fixing mechanism 19, release the handle 20. Under the action of the spring 1904, the sliding seat 1901 moves forward, and at the same time squeezes and pushes the arc-shaped block 1908 to move upward, and the hook 1907 moves downward to limit the locking tongue 17 on the T-shaped slider 16. At this time, the folding frame main body 9 is in the unfolded state.

[0055] When folding is needed, perform the same operation. By pulling up the handle 20, the fixing mechanism 19 releases the limitation on the locking tongue 17 on the T-shaped slider 16. The T-shaped slider 16 moves downward to fold the folding frame main body 9 to fit onto the luggage body 1. The locking tongue 17 on the handrail frame 12 is inserted into the hook 1907. Release the handle 20. Under the action of the spring 1904, the sliding seat 1901 moves forward, and at the same time squeezes and pushes the arc-shaped block 1908 to move upward, and the hook 1907 moves downward to limit the locking tongue 17 on the handrail frame 12. At this time, the folding frame main body 9 is in the folded state.

[0056] The design of the locking tongue 17 and the fixing mechanism 19 can make the folding state and the unfolding state of the folding frame body 9 switch at will, and can always maintain the current state when the state is not switched, with high reliability and high safety.

[0057] Embodiment 2:

[0058] Reference Figures 8 - 14 This embodiment provides a suitcase, which adopts the above-mentioned folding frame, wherein the folding frame main body 9 is installed on the suitcase body 1, and the first rollers 3 are installed at the four corners of the bottom of the suitcase body 1.

[0059] A storage box 2 is fixedly arranged on the top of the suitcase body 1 . A groove 4 is provided on the suitcase body 1 at the connection position of the folding frame body 9 . The outer contour of the handrail 12 matches the groove 4 .

[0060] First rectangular tubes 5 are vertically arranged on both sides of the groove 4, and a plurality of first limiting holes 501 are opened on the first rectangular tubes 5. The first limiting holes 501 are designed to be small at the top and large at the bottom. Large cap nails 1002 are installed on the side walls on both sides of the back plate 10 at the positions corresponding to the first limiting holes 501. A through groove 7 is opened in the groove 4 on the luggage case body 1. A first baffle plate 8 is hingedly arranged in the through groove 7, and a twist spring is installed at the hinge to act on the first baffle plate 8 with torsion, and a first limiting plate 801 is installed on the first baffle plate 8.

[0061] A first accommodating groove 6 for accommodating the electric roller 22 is provided on the suitcase body 1 below the groove 4. The first roller 3 is a universal wheel. After the folding frame 9 is unfolded, the suitcase body 1 tilts, and the roller 3 of the suitcase body 1 touching the ground deflects along the force direction and turns to roll along the force direction.

[0062] In the utility model, the folding frame body 9 is installed on the suitcase body 1, and the back plate 10 on the folding frame body 9 is installed on the rectangular tube 5 in the groove 4; during installation, the baffle plate 8 is rotated to make the baffle plate 8 disengage from the through groove 7, and then the large cap nails 1002 installed on the back plate 10 are respectively inserted into the large hole ends of the corresponding limiting holes 501, and the back plate 10 is moved upward to make the large cap nails 1002 move to the small hole ends of the corresponding limiting holes 501 for limiting, and finally the baffle plate 8 is rotated to make the baffle plate 8 enter the through groove 7 to support the back plate 10. Under the action of the torsion of the twist spring, the baffle plate 8 can be firmly fixed in the through groove 7 to prevent the back plate 10 from falling off or displacement. This arrangement facilitates the connection between the suitcase body 1 and the folding frame body 9, and no other auxiliary devices are used, and installation and disassembly are very convenient.

[0063] The folding frame body 9 on the suitcase body 1 can be folded up, which can save space. The whole can be used as a suitcase for easy storage and transportation.

[0064] The folding frame body 9 on the suitcase body can also be unfolded, and can be used as a walking vehicle in conjunction with the electric roller 22 and the first roller 3 at the bottom of the suitcase body 1, which can not only save energy for the user but also is very convenient to use and can meet a variety of usage needs.

[0065] Furthermore, the storage box 2 can store articles and can also be used as a cushion for the user when unfolded.

[0066] At the same time, the luggage case body 1 is in an inclined state at this time, and the whole body forms a triangle state with the folding frame body 9, which has good stability. In addition, the folding frame body 9 and the luggage case body 1 have three wheels on the ground, which is not easy to tip over, has low driving difficulty, and is convenient for users to operate.

[0067] The user can use the handle 26 to adjust the driving direction, and can also adjust the height of the handle 26 by adjusting the extension length of the pull rod 25 on the handrail 12, so as to adapt to users of different heights, improve the stability and safety of use, and facilitate better support for users.

[0068] Embodiment three:

[0069] Reference Figures 15 - 19 This embodiment provides a trolley, which adopts the above-mentioned folding frame, and the folding frame body 9 is installed on the trolley body 28. The bottom of the trolley body 28 is equipped with a second roller 30.

[0070] A door-shaped frame 29 is provided on the handcart body 28, and the outer contour of the back plate 10 matches the door-shaped frame 29. A second rectangular tube 33 is fixedly provided on the inner wall of the door-shaped frame 29. A plurality of second limiting holes 3301 are provided on the second rectangular tube 33. The second limiting holes 3301 are designed to be small at the top and large at the bottom. Large cap nails 1002 are installed on the side walls on both sides of the back plate 10 at the corresponding positions of the second limiting holes 3301. A second baffle plate 35 is hinged at the bottom in the door-shaped frame 29, and a twist spring is installed at the hinge to act on the second baffle plate 35 with torsion, and a second limiting plate 3501 is installed on the second baffle plate 35.

[0071] A loading bucket 31 that can rotate 90 degrees is hinged at the bottom of the side of the handcart body 28, and a third receiving slot 34 for receiving the electric roller 22 is provided at the bottom of the door-shaped frame 29;

[0072] A storable seat cushion 32 is hingedly provided on the top of the door-shaped frame 29 , and a stopper 2901 is fixedly provided on the side wall of the door-shaped frame 29 below the storable seat cushion 32 .

[0073] In the utility model, the folding frame body 9 on the handcart body 28 can be folded up, and in this state, the handcart can be used as a handcart. At this time, the overall volume of the device is the smallest, which is convenient for use in a narrow area.

[0074] The folding frame body 9 on the handcart main body 1 can also be unfolded. Cooperating with the electric roller 22 and the second roller 30 at the bottom of the handcart main body, it can be used as a scooter. It can not only save physical strength for users, but also be very convenient to use, meeting various usage requirements. Moreover, when the folding frame body 9 is unfolded, the handcart main body 1 is in an inclined state at this time, and the whole forms a triangular state with the folding frame body 9, having good stability. And there are a total of three wheels of the folding frame body 9 and the handcart main body 1 touching the ground, not easily tipping over, with a low driving difficulty and being convenient for users to operate.

[0075] Users can use the handle 26 to adjust the driving direction and also adjust the height of the handle 26 by adjusting the extending length of the pull rod 25 on the handrail 12, so as to adapt to users of different heights, improving the stability and safety of use and being convenient for users to hold better.

[0076] The above is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, making equivalent replacements or changes should be covered within the protection scope of the present utility model.

Claims

1. A folding rack, characterized in that, It includes a folding frame body (9), and the folding frame body (9) includes a backboard (10), a connecting beam (11) and a handrail (12). One end of the connecting beam (11) is hinged to the side wall of the backboard (10), and a wheel frame (23) is horizontally hinged at the other end of the connecting beam (11). An electric roller (22) is installed on the wheel frame (23). A second accommodation groove (13) is formed on the handrail (12), and the second accommodation groove (13) is matched with the connecting beam (11). A fork frame (27) is arranged at the bottom of the handrail (12), and the end parts of the fork frame (27) are respectively connected to the rotating shafts on both sides of the wheel frame (23). Support rods (14) are hinged on the side wall of the connecting beam (11), and T-shaped sliders (16) are hinged at the end parts of the support rods (14). T-shaped sliding grooves (15) are formed on the backboard (10) at the positions opposite to the T-shaped sliders (16), and the T-shaped sliders (16) are respectively slidably arranged in the corresponding T-shaped sliding grooves (15). A locking tongue (17) is arranged at the top of the T-shaped slider (16). A fixing mechanism (19) is installed at the top in the T-shaped sliding groove (15). Locking tongues (17) are arranged at the positions opposite to the fixing mechanism (19) on the inner side of the second accommodation groove (13) of the handrail (12), and the locking tongues (17) are respectively matched with the corresponding fixing mechanisms (19).

2. The folding rack according to claim 1, wherein A pull rod (25) is slidably arranged in the handrail (12), and handles (26) are fixedly arranged on the side walls on both sides of the pull rod (25). The connecting beam (11) adopts a hollow structure, and a storage battery is arranged in the connecting beam (11). The storage battery is electrically connected to the electric roller (22). A switch and a control knob are arranged on the handle (26), and the switch is electrically connected to the storage battery. The control knob is electrically connected to the electric roller (22).

3. The folding rack according to claim 2, wherein The fixing mechanism (19) includes a sliding seat (1901), a swing arm (1906) and a hook (1907). A cavity (1001) is formed in the back plate (10). A limiting slide bar (1903) and a rotating shaft (1909) are horizontally arranged in the cavity (1001) inside the back plate (10). A strip-shaped hole (1902) is formed in the sliding seat (1901). The strip-shaped hole (1902) is slidably sleeved on the limiting slide bar (1903). A plurality of springs (1904) are connected between the inner wall of the strip-shaped hole (1902) and the limiting slide bar (1903). An arc-shaped groove (1905) is formed in the sliding seat (1901). A swing arm (1906) is rotatably arranged on the rotating shaft (1909). An arc-shaped block (1908) is fixedly arranged at one end of the swing arm (1906). The arc-shaped block (1908) is located in the arc-shaped groove (1905). A hook (1907) is fixed at the other end of the swing arm (1906). A pull ring (1910) is fixedly arranged in the cavity (1001) on the swing arm (1906). The lock tongue (17) is matched with the hook (1907). The pull ring (1910) is connected with a T-shaped handle (20) through a pull rope (21). The handle (20) is inserted and arranged at the top of the back plate (10).

4. The folding rack according to claim 3, wherein, Pedals (24) are fixedly arranged on the side walls on both sides of the wheel frame (23). A reinforcing rod (18) is fixedly arranged between the support rods (14).

5. A suitcase using a folding rack as described in any one of claims 1-4, comprising a suitcase body (1), characterized in that, The folding frame body (9) is installed on the luggage body (1). The first rollers (3) are installed at the four corners of the bottom of the luggage body (1).

6. The trunk according to claim 5, characterized in that, A storage box (2) is fixedly arranged on the top of the luggage body (1). A groove (4) is formed at the connection part of the folding frame body (9) on the luggage body (1). The outer contour of the handrail (12) matches the groove (4).

7. The trunk according to claim 6, characterized in that, First rectangular tubes (5) are vertically arranged on both sides in the groove (4). A plurality of first limiting holes (501) are formed in the first rectangular tubes (5). The first limiting holes (501) are designed with a smaller upper part and a larger lower part. Big cap screws (1002) are respectively installed at the opposite positions corresponding to the first limiting holes (501) on the side walls on both sides of the back plate (10). A through groove (7) is formed in the luggage body (1) in the groove (4). A first baffle (8) is hinged in the through groove (7), and a torsion spring acting on the first baffle (8) is installed at the hinge. A first limiting plate (801) is installed on the first baffle (8). A first accommodation groove (6) for accommodating the electric roller (22) is formed below the groove (4) on the luggage body (1). The first roller (3) is a universal rotating wheel. After the folding frame body (9) is unfolded, the luggage body (1) is inclined. The roller (3) of the luggage body (1) in contact with the ground deflects along the force application direction and turns to roll along the force application direction.

8. A handcart using the folding rack according to any one of claims 1-4, comprising a handcart main body (28), characterized in that, The folding frame body (9) is installed on the trolley body (28), and the second rollers (30) are installed at the bottom of the trolley body (28).

9. The trolley according to claim 8, characterized in that, A gantry frame (29) is provided on the trolley body (28). The outer contour of the back plate (10) matches the gantry frame (29). A second rectangular pipe (33) is fixedly provided on the inner wall of the gantry frame (29). A plurality of second limiting holes (3301) are formed in the second rectangular pipe (33). The second limiting holes (3301) are designed with a smaller upper part and a larger lower part. Big cap screws (1002) are installed at the opposite positions of the corresponding second limiting holes (3301) on the side walls of both sides of the back plate (10). A second baffle (35) is hinged at the bottom inside the gantry frame (29), and a torsion spring with a torsion effect on the second baffle (35) is installed at the hinge. A second limiting plate (3501) is installed on the second baffle (35).

10. The trolley according to claim 9, wherein A load-carrying hopper (31) that can rotate 90 degrees is hinged at the bottom of the side of the trolley body (28). A third accommodation groove (34) for accommodating the electric roller (22) is formed at the bottom of the gantry frame (29). A retractable seat cushion (32) is hinged at the top of the gantry frame (29), and a stop block (2901) is fixedly provided on the side wall of the gantry frame (29) below the retractable seat cushion (32).

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