Folding trolley with multiple transportation forms

Abstract

The utility model discloses a folding trolley with various transportation forms, which comprises a bearing component, a front caster unit, a rear caster unit, a shovel plate and a pushing handle, the bearing component comprises a bearing plate and a supporting tube, the front caster unit comprises a front wheel arm and a front hub, one end of the front wheel arm is rotatably connected with the front end of the supporting tube, and the other end of the front wheel arm is provided with a front wheel axle; the front hub is rotationally connected with the front axle, the front hub is provided with three wheels which are distributed in a regular triangle shape with the front axle as the center, a pivot shaft of each wheel in the three wheels is parallel to the front axle, and the diameter of an inscribed circle of a wheel set composed of the three wheels is smaller than half of the distance between the two supporting pipes; the pushing handle is pivoted with a connecting device arranged at the rear end of the supporting pipe and can rotate between the position where the pushing handle is folded by about 0 degree and the position where the pushing handle is unfolded by about 180 degrees relative to the bearing assembly. The trolley has the advantages that the trolley has a flat-plate trolley mode with high transportation capacity and a stair-climbing trolley mode with high obstacle crossing capacity, and is wide in application range.

Description

Technical Field

[0001] The utility model belongs to the technical field of small-sized plane transport equipment, and more specifically, particularly relates to a foldable trolley with multiple transport forms. Background Art

[0002] Trolleys are currently a commonly used means of transportation, mostly used for transporting goods between shelves and warehouses in shopping malls and supermarkets, and for storing and transporting shopping carts for consumers. Trolleys are mainly divided into two categories, one is a four-wheeled flatbed trolley, and the other is a two-wheeled trolley. Different trolleys are needed for different scenarios.

[0003] The trolleys used in daily life perform better when traveling on flat roads, but they cannot travel normally when encountering obstacles, such as door thresholds, steps in front of buildings, roadbeds beside roads, etc. When unloaded, the obstacles can be passed by lifting the entire trolley, but when loaded with goods, the entire trolley cannot be lifted due to its heavy weight. Auxiliary flat plates need to be laid to form a slope to allow the trolley to travel over obstacles, which is more physically demanding and not very convenient to use.

[0004] For example, the Chinese utility model patent with patent number 201820446082.6 and patent name of folding stair climbing vehicle includes a bracket, two plug-in columns at the lower end of the bracket are sequentially interspersed with a sliding sleeve, a sliding inner sleeve, a supporting sleeve, a toothed sleeve, a torsion spring and a tripod, and the two plug-in columns at the lower end of the bracket are rotatably connected to the two ends of the shovel plate, the torsion spring is arranged inside the tripod, and the lower end of the torsion spring is fixed in the tripod, the toothed sleeve is fixed to the plug-in column at the lower end of the bracket by a screw, and the upper end of the torsion spring is fixedly connected to the screw, the sliding sleeves are connected by a middle connecting pipe, the outer side of the sliding sleeve is connected to the upper end of the connecting rod, the lower end of the connecting rod is connected to the shovel plate, one side of the supporting sleeve is connected to the upper end of the supporting seat, one side of the tripod is connected to the lower end of the rotating block, the lower end of the supporting seat is connected to the lower part of the rotating block, and is located on the upper side of the connection point between the tripod and the rotating block, the upper end of the rotating block is connected to the tripod, and the three ends of the tripod are rotatably connected to rollers.

[0005] The above technical solution can realize the function of walking on stairs by setting three rollers, and the support sleeve and the tripod can be rotated, so that the tripods on both sides can be folded inwards to realize the function of roller storage and save space for storing the trolley. However, it also has shortcomings. It only has one transportation form, that is, using a shovel to carry goods. The shovel area for carrying goods is relatively small, and the cargo transportation capacity is relatively poor. Summary of the invention

[0006] The purpose of the present invention is to solve the above-mentioned technical problems and to provide a foldable trolley with multiple transport forms, strong transport capacity and easy obstacle crossing.

[0007] The utility model is achieved through the following technical solutions.

[0008] The utility model provides a folding trolley with multiple transport forms, including a load-bearing component, a front caster unit, a rear caster unit, a shovel plate and a push handle, wherein the front caster unit and the shovel plate are installed at the front of the load-bearing component, and the shovel plate can be rotated and opened about 90 degrees relative to the load-bearing component, and the rear caster unit and the push handle are installed at the rear of the load-bearing component, and the load-bearing component includes a load-bearing plate and two support pipes arranged on both sides of the load-bearing plate, and the front caster unit includes a front wheel arm and a front wheel hub, and one end of the front wheel arm can be rotatably connected to the support pipe. The front end is connected, and the other end of the front wheel arm is provided with a front wheel axle, the front wheel hub is rotatably connected to the front wheel axle, the front wheel hub has three wheels distributed in an equilateral triangle with the front wheel axle as the center, the pivot axis of each of the three wheels is parallel to the front wheel axle, the diameter of the inscribed circle of the wheel group composed of the three wheels is less than half of the distance between the two support tubes, the bottom end of the push handle is pivotally connected to the connecting device provided at the rear end of the support tube, and the push handle can rotate between a position folded about 0 degrees relative to the load-bearing component and a position opened about 180 degrees relative to the load-bearing component.

[0009] In the above technical scheme, the trolley can change into a variety of transportation states. When the load-bearing component is in a horizontal state, the push handle is rotated to an upright state relative to the load-bearing component, that is, about 90 degrees. At this time, it is a flatbed trolley transportation mode. In this mode, the load-bearing plate area is large and the transportation capacity is strong, which is suitable for transportation on a flat ground; when the push handle is rotated to an open position of about 180 degrees relative to the load-bearing component, the shovel plate can be rotated and opened about 90 degrees relative to the load-bearing component. At this time, it is a stair climbing trolley mode. Although the shovel plate area is relatively small and the transportation capacity is weak, the wheel group composed of three wheels has a strong ability to cross obstacles, which is suitable for uneven roads or climbing stairs. According to actual needs, it can meet most of the needs of daily transportation and has strong practicality; when it needs to be folded and stored, the push handle is rotated to a folded position relative to the load-bearing component, that is, about 0 degrees, and the front caster unit is rotated and folded relative to the support tube. Because the diameter of the inscribed circle of the wheel group composed of three wheels is less than half of the distance between the two support tubes, the front caster unit can be rotated to a position relatively parallel to the load-bearing plate, which can be conveniently carried and stored.

[0010] Preferably, a front wheel opening device is provided at the bottom of the load-bearing component, and the front wheel opening device includes an operating handle, a connecting rod and a driving plate. The operating handle is pivotally connected to the bottom of the load-bearing plate, one end of the connecting rod is pivotally connected to the operating handle, and the other end of the connecting rod is rotationally connected to a side of the driving plate close to the operating handle. The side of the driving plate away from the operating handle is pivotally connected to the front end of the support tube through a connecting nail. When the operating handle rotates, the operating handle can be linked to the driving plate through the connecting rod to drive the front caster unit to rotate from the folded storage position to the unfolded rolling position. In this technical solution, the front wheel opening device can facilitate the opening of the front caster unit, and the driving plate can also support the two front caster units to prevent the two front caster units from accidentally folding during transportation.

[0011] Preferably, the operating handle includes two side arms and a grip disposed between the two side arms, one end of the side arm is pivotally connected to a fixing seat, the fixing seat is connected and fixed to the bottom of the load-bearing plate, a first connecting column is disposed on the inner side of the side arm, a second connecting column is disposed on the same side of the fixing seat, a tension spring is disposed between the first connecting column and the second connecting column, the two ends of the tension spring are respectively fixed to the first connecting column and the second connecting column, a connecting shaft is disposed on the outer side of the side arm, and the connecting shaft is pivotally connected to one end of the connecting rod. In this technical solution, when the load-bearing assembly is placed upright, the front caster unit can be quickly opened by flipping the operating handle, which is easy to operate, and the tension spring can apply a pre-tightening force to the operating handle to prevent the operating handle from accidentally rotating due to vibration force during transportation.

[0012] Preferably, a clamping column is provided on the inner side of the front wheel arm, and a clamping groove is provided at the end of the driving plate at a position corresponding to the clamping column, and the clamping column is configured to be clamped into the clamping groove when the front caster unit rotates to the unfolded rolling position. In this way, the driving plate is not easy to separate from the clamping column when vibrating, and maintains contact with the inner side of the front wheel arm, which can improve the stability of the front caster unit in the unfolded rolling position.

[0013] Preferably, the support tube is provided with a front fixing member and a first torsion spring at a position corresponding to the front wheel arm, the front fixing member is connected and fixed to the support tube to limit the front wheel arm from moving along the support tube, the first torsion spring is sleeved on the support tube and one end of the first torsion spring abuts against the front fixing member, and the other end abuts against the front wheel arm, and when the first torsion spring is in a natural state, the front caster unit is located in a folded storage position. In this way, the connection between the front wheel arm and the support tube is more stable, and when folding and retracting is required, in the process of the driving plate gradually separating from the front wheel arm, under the action of the first torsion spring, the front wheel arm will automatically rotate relative to the support tube, thereby realizing automatic folding and retracting of the front caster unit, and there is no need for manual operation to fold the front caster unit, which is more convenient to use.

[0014] Preferably, the connection device includes a connection seat, the connection seat is provided with a first connection channel and a second connection channel, the connection seat is sleeved on the rear end of the support tube through the first connection channel, a connection tube is provided in the second connection channel, a mounting notch communicating with the second connection channel is provided at the bottom of the connection seat, and the rear caster unit is rotatably connected to the connection tube at the mounting notch position. In this way, the push handle and the connection and installation of the rear caster unit and the load-bearing component can be facilitated.

[0015] Preferably, the rear caster unit includes a rotating block, a second torsion spring, a caster frame and a rear caster, the rotating block is placed in the installation notch and is rotatably connected to the connecting tube, one end of the caster frame is connected and fixed to the rotating block, the second torsion spring is sleeved on the connecting tube and one end of the second torsion spring abuts against the connecting seat, and the other end abuts against the rotating block, the other end of the caster frame is provided with a rear wheel axle, and the rear caster is rotatably connected to the rear wheel axle. In this technical solution, in the process of pushing the handle to rotate and open relative to the load-bearing component, the bottom end of the push handle will push the inner side of the caster frame to force the rear caster unit to open, and in the process of pushing the handle to fold relative to the load-bearing component, the bottom end of the push handle will gradually separate from the inner side of the caster frame, and the rear caster unit can be automatically folded and retracted under the action of the second torsion spring, and there is no need for manual operation to fold the rear caster unit, which is more convenient to use.

[0016] Preferably, the inner side surface of the connecting seat is provided with a pivot hole, a first positioning hole and a second positioning hole, the pushing handle is pivotally connected to the pivot hole, and a locking mechanism is provided at the bottom of the pushing handle, the locking mechanism cooperates with the first positioning hole when the pushing handle is rotated to a relatively upright state relative to the load-bearing component, and cooperates with the second positioning hole when the pushing handle is rotated to a position opened about 180 degrees relative to the load-bearing component. In this way, when the locking mechanism cooperates with the first positioning hole and the second positioning hole respectively, the corresponding state of the pushing handle can be maintained, that is, the corresponding transportation form of the trolley can be maintained, and the product performance is more stable and practical.

[0017] Preferably, the push handle includes two vertical tubes, the top ends of the two vertical tubes are connected with a second horizontal tube for the user to grasp, the lower parts of the two vertical tubes are both covered with lower connecting sleeves, the push handle is pivotally connected to the pivot hole of the connecting seat by screws passing through the lower connecting sleeve and the vertical tube, a first horizontal tube is connected between the two lower connecting sleeves, the locking mechanism includes a locking rod and a pressure spring placed in the first horizontal tube, and a control button provided outside the first horizontal tube and connected to the locking rod, the vertical tube is provided with an avoidance hole at a position corresponding to the locking rod, and the end of the locking rod can pass through the avoidance hole and cooperate with the first positioning hole and the second positioning hole to lock the push handle. In this technical solution, when it is necessary to switch the transport mode, the locking rod is retracted into the first horizontal tube to disengage from the first positioning hole or the second positioning hole by operating the control button, and then the push handle is rotated to the corresponding position, and then the force applied to the control button is canceled, the operation is simple and convenient, and the performance is stable and reliable.

[0018] Preferably, the shovel board is provided with a pivot seat at a position corresponding to the front end of the two support tubes, the pivot seat is pivotally connected to the front end of the support tube, a compression spring and a positioning pin are sequentially installed in the front end of the support tube, and the positioning pin can abut against the seat wall of the pivot seat of the shovel board under the action of the compression spring. In this way, when the shovel board is rotated relative to the load-bearing component to be opened or folded for storage, the positioning pin can provide pressure positioning for the shovel board, which can effectively prevent the shovel board from accidentally opening.

[0019] The beneficial effects of the utility model are:

[0020] (1) It has both a flatbed trolley mode with strong transport capabilities and a stair climbing trolley mode with strong obstacle-crossing capabilities, which can meet various needs of daily use, has a wide range of applications and is highly practical;

[0021] (2) The handle and caster unit can be folded relative to the load-bearing component to a relatively parallel state, which is convenient for carrying and storage.

[0022] (3) The front caster unit and the rear caster unit can be folded and collapsed automatically without manual operation, making it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the utility model in a flatbed trolley transport mode;

[0024] Figure 2 This is a schematic diagram of the structure of the utility model in the stair climbing trolley mode;

[0025] Figure 3 It is a schematic diagram of the structure of the utility model when folded;

[0026] Figure 4 A schematic diagram of the front caster unit of the utility model being opened from a folded storage position to an unfolded rolling position;

[0027] Figure 5 It is a schematic diagram of the front caster unit of the utility model being installed in coordination with the support tube;

[0028] Figure 6 It is a schematic diagram of the rear caster unit and the support tube of the utility model in cooperation with each other for installation;

[0029] Figure 7 This is a schematic diagram of the installation of the shovel plate and the support pipe of the utility model;

[0030] Figure 8 This is an exploded schematic diagram of the front wheel opening device of the utility model;

[0031] Fig. 9 It is a structural schematic diagram of the locking mechanism of the utility model;

[0032] Fig.10 It is an exploded schematic diagram of the rear caster unit of the utility model. DETAILED DESCRIPTION

[0033] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0034] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0035] Example 1

[0036] The utility model provides a foldable trolley with multiple transport modes, such as Figures 1 to 4As shown, it includes a load-bearing component, a front caster unit 3, a rear caster unit 4, a shovel plate 5 and a push handle 6, wherein the front caster unit 3 and the shovel plate 5 are installed at the front of the load-bearing component, and the shovel plate 5 can be rotated and opened about 90 degrees relative to the load-bearing component, and the rear caster unit 4 and the push handle 6 are installed at the rear of the load-bearing component, and the load-bearing component includes a load-bearing plate 1, and two support tubes 2 arranged on both sides of the load-bearing plate 1, and the front caster unit 3 includes a front wheel arm 31 and a front wheel hub 34, one end of the front wheel arm 31 is rotatably connected to the front end of the support tube 2, and the other end of the front wheel arm 31 is A front wheel axle 32 is provided, and the front wheel hub 34 is rotatably connected to the front wheel axle 32. The front wheel hub 34 has three wheels 33 distributed in an equilateral triangle with the front wheel axle 32 as the center. The pivot axis of each of the three wheels 33 is parallel to the front wheel axle 32. The diameter of the inscribed circle of the wheel group composed of the three wheels 33 is less than half of the distance between the two support tubes 2. The bottom end of the pushing handle 6 is pivotally connected to the connecting device provided at the rear end of the support tube 2. The pushing handle 6 can rotate between a position folded about 0 degrees relative to the load-bearing component and a position opened about 180 degrees relative to the load-bearing component.

[0037] like Figure 5 As shown, as a further improvement, the support tube 2 is provided with a front fixing part 35 and a first torsion spring 36 at the position corresponding to the front wheel arm 31, the front fixing part 35 is sleeved on the support tube and is connected and fixed to the support tube 2, a notch is provided in the middle of the front fixing part 35, the front wheel arm 31 is placed in the notch and is rotatably connected to the support tube 2, so that the front fixing part 35 can limit the movement of the front wheel arm 31 along the support tube 2, the first torsion spring 36 is sleeved on the support tube 2 and one end of the first torsion spring 36 abuts against the front fixing part 35, and the other end abuts against the front wheel arm 31, when the first torsion spring 36 is in a natural state, the front caster unit 3 is in a folded storage position.

[0038] like Figure 6 As shown, in this embodiment, the connection device includes a connection seat 7, the connection seat 7 is provided with a first connection channel and a second connection channel, the connection seat 7 is sleeved on the rear end of the support tube 2 through the first connection channel, the second connection channel is provided with a connection tube 8, the bottom of the connection seat 7 is provided with a mounting notch connected to the second connection channel, and the rear caster unit 4 is rotatably connected to the connection tube 8 at the mounting notch position. A pivot hole 71, a first positioning hole 72 and a second positioning hole 73 are provided on the inner side surface of the connection seat 7, the push handle 6 is pivotally connected to the pivot hole 71, and a locking mechanism is provided at the bottom of the push handle 6, the locking mechanism cooperates with the first positioning hole 72 when the push handle 6 is rotated to a relatively upright state relative to the load-bearing component, and cooperates with the second positioning hole 73 when the push handle 6 is rotated to a position opened about 180 degrees relative to the load-bearing component.

[0039] like Figure 1 and Figure 8 As shown, in this embodiment, the push handle 6 includes two vertical tubes 61, the top ends of the two vertical tubes 61 are connected to a second horizontal tube 63 for the user to grasp, the lower parts of the two vertical tubes 61 are sleeved with a lower connecting sleeve 64, the push handle 6 is pivotally connected to the pivot hole 71 of the connecting seat 7 by screws passing through the lower connecting sleeve 64 and the vertical tube 61, a first horizontal tube 62 is connected between the two lower connecting sleeves 64, and the locking mechanism includes two locking rods 67 placed on the left and right sides of the first horizontal tube 62, two pressure springs 66, and a locking mechanism sleeved on the first horizontal tube 62. There are two control buttons 65 connected to the locking rod 67 outside the vertical tube 61, and an avoidance hole is provided at the position corresponding to the locking rod 67. The end of the locking rod 67 can pass through the avoidance hole and cooperate with the first positioning hole 72 and the second positioning hole 73 to lock the push handle 6. When it is necessary to switch the transportation mode, the two control buttons 65 can be pinched axially by two fingers to retract the two locking rods 67 into the first horizontal tube 62 to disengage from the first positioning hole 72 or the second positioning hole 74, and then the push handle 6 is rotated to the corresponding position, and then the force on the control button 65 is canceled.

[0040] like Figure 7 As shown, as a further improvement, the shovel plate 5 is provided with a pivot seat 51 at the position corresponding to the front end of the two support tubes 2, and the pivot seat 51 is pivotally connected to the front end of the support tube 2. A compression spring 53 and a positioning pin 52 are sequentially embedded in the front end tube of the support tube 51. The positioning pin 52 can abut against the seat wall of the pivot seat 51 of the shovel plate 5 under the action of the compression spring 53. When the shovel plate 5 is rotated relative to the load-bearing component to open or folded for storage, the positioning pin 52 can provide pressure positioning for the shovel plate 5, which can effectively prevent the shovel plate 5 from opening accidentally.

[0041] Example 2

[0042] The structure of this embodiment is similar to that of embodiment 1, except that Figure 2 , Figure 3 , Figure 4 and Fig. 9As shown in the figure, a front wheel opening device is provided at the bottom of the load-bearing component. The front wheel opening device includes an operation handle 91, a connecting rod 92, and a driving plate 93. The operation handle 91 includes two side arms and a grip provided between the two side arms. One end of each side arm is pivotally connected to a fixing seat 94. The fixing seat 94 is fixedly connected to the bottom of the load-bearing plate 1. A first connecting column 911 is provided on the inner side of the side arm. A second connecting column 941 is provided on the fixing seat 94 on the same side. A tension spring 95 is arranged between the first connecting column 911 and the second connecting column 941. The two ends of the tension spring 95 are respectively fixed to the first connecting column 911 and the second connecting column 941. A connecting shaft 912 is provided on the outer side of the side arm. The connecting shaft 912 is pivotally connected to one end of the connecting rod 92. The other end of the connecting rod 92 is rotatably connected to the side of the driving plate 93 close to the operation handle 91. The left and right ends of the side of the driving plate 93 away from the operation handle 91 are pivotally connected to the front end of the support tube 2 through connecting pins 931. When the operation handle 91 rotates, the operation handle 91 drives the driving plate 93 to act through the connecting rod 92. The left and right ends of the driving plate 93 force the front wheel arms 31 to rotate and open with the support tube 2 as the rotation axis from the inner side of the front wheel arms 31, so that the front caster unit 3 rotates from the folded storage position to the unfolded rolling position. After the operation handle 91 rotates in place, the tension spring 95 can apply a pre-tightening force to the operation handle 91, which can prevent the operation handle 91 from rotating accidentally due to vibration force during transportation.

[0043] As a further improvement, as Figure 5 and Fig. 9 shown, a clamping post 311 is provided on the inner side of the front wheel arm 31. A clamping groove 932 is provided at the position of the end of the driving plate 93 corresponding to the clamping post 311. The clamping post 311 is arranged to be able to be clamped into the clamping groove 932 when the front caster unit 3 rotates to the unfolded rolling position. In this way, the stability of the front caster unit 3 maintained in the unfolded rolling position can be improved.

[0044] Embodiment 3

[0045] The structure of this embodiment is similar to that of Embodiment 2, and the difference is that, as Figure 6 and Fig. 9As shown, the rear caster unit 4 includes a rotating block 41, a second torsion spring 45, a caster frame 42 and a rear caster 44, the rotating block 41 is placed in the installation notch of the connecting seat 7 and is rotatably connected to the connecting pipe 8, the second torsion spring 45 is sleeved on the connecting pipe 8 and one end of the second torsion spring 45 abuts against the connecting seat 7, and the other end abuts against the rotating block 41, one end of the caster frame 42 is connected and fixed to the rotating block 41, the other end of the caster frame 42 is provided with a rear wheel shaft 43, and the rear caster 44 is rotatably connected to the rear wheel shaft 43, when the push handle 6 is rotated and opened, the bottom end of the push handle 6 abuts against the inner side of the caster frame 42, which will force the caster frame 42 and the rotating block 41 to rotate and open with the support tube 2 as the rotating axis, when the push handle 6 is folded about 0 degrees relative to the load-bearing component, the bottom end of the push handle 6 no longer abuts against the inner side of the caster frame 42, and the rear caster unit 4 will automatically fold and retract under the action of the second torsion spring 45, without manual operation, and is easy to use.

[0046] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A foldable trolley with multiple transport modes, comprising a load-bearing component, a front caster unit (3), a rear caster unit (4), a shovel plate (5) and a push handle (6), wherein the front caster unit (3) and the shovel plate (5) are mounted on the front of the load-bearing component, the shovel plate (5) can be rotated and opened about 90 degrees relative to the load-bearing component, and the rear caster unit (4) and the push handle (6) are mounted on the rear of the load-bearing component, characterized in that: The load-bearing assembly comprises a load-bearing plate (1) and two support tubes (2) arranged on both sides of the load-bearing plate (1); the front caster unit (3) comprises a front wheel arm (31) and a front wheel hub (34); one end of the front wheel arm (31) is rotatably connected to the front end of the support tube (2); the other end of the front wheel arm (31) is provided with a front wheel axle (32); the front wheel hub (34) is rotatably connected to the front wheel axle (32); the front wheel hub (34) has three front wheels centered on the front wheel axle (32) and arranged in an arc shape. The wheels (33) are arranged in an equilateral triangle, the pivot axis of each wheel (33) of the three wheels (33) is parallel to the front wheel axle (32), the diameter of the inscribed circle of the wheel group composed of the three wheels (33) is less than half the distance between the two support tubes (2), the bottom end of the push handle (6) is pivotally connected to a connecting device provided at the rear end of the support tube (2), and the push handle (6) can rotate between a position of folding about 0 degrees relative to the load-bearing component and a position of opening about 180 degrees relative to the load-bearing component.

2. The foldable trolley with multiple transport modes according to claim 1, characterized in that: A front wheel opening device (9) is provided at the bottom of the load-bearing component. The front wheel opening device (9) comprises an operating handle (91), a connecting rod (92) and a driving plate (93). The operating handle (91) is pivotally connected to the bottom of the load-bearing plate (1). One end of the connecting rod (92) is pivotally connected to the operating handle (91). The other end of the connecting rod (92) is rotationally connected to a side of the driving plate (93) close to the operating handle (91). A side of the driving plate (93) away from the operating handle (91) is pivotally connected to the front end of the support tube (2) via a connecting pin (931). When the operating handle (91) rotates, the operating handle (91) can link the driving plate (93) via the connecting rod (92) to drive the front caster unit (3) to rotate from a folded storage position to an unfolded rolling position.

3. The foldable trolley with multiple transport modes according to claim 2, characterized in that: The operating handle (91) comprises two side arms and a grip arranged between the two side arms, one end of the side arm is pivotally connected to a fixing seat (94), the fixing seat (94) is connected and fixed to the bottom of the load-bearing plate (1), a first connecting column (911) is arranged on the inner side of the side arm, and a second connecting column (941) is arranged on the same side of the fixing seat (94), a tension spring (95) is arranged between the first connecting column (911) and the second connecting column (941), the two ends of the tension spring (95) are respectively fixed to the first connecting column (911) and the second connecting column (941), and a connecting shaft (912) is arranged on the outer side of the side arm, and the connecting shaft (912) is pivotally connected to one end of the connecting rod (92).

4. The foldable trolley with multiple transport modes according to claim 3, characterized in that: A clamping column (311) is provided on the inner side of the front wheel arm (31), and a clamping groove (932) is provided at the end of the driving plate (93) at a position corresponding to the clamping column (311), and the clamping column (311) is configured to be able to be clamped into the clamping groove (932) when the front caster unit (3) rotates to the unfolded rolling position.

5. The foldable trolley with multiple transport modes according to claim 4, characterized in that: The support tube (2) is provided with a front fixing member (35) and a first torsion spring (36) at a position corresponding to the front wheel arm (31); the front fixing member (35) is connected and fixed to the support tube (2) so as to limit the movement of the front wheel arm (31) along the support tube (2); the first torsion spring (36) is sleeved on the support tube (2) and one end of the first torsion spring (36) abuts against the front fixing member (35) and the other end abuts against the front wheel arm (31); when the first torsion spring (36) is in a natural state, the front caster unit (3) is located in a folded storage position.

6. The foldable trolley with multiple transport modes according to any one of claims 1 to 5, characterized in that: The connection device comprises a connection seat (7), the connection seat (7) being provided with a first connection channel and a second connection channel, the connection seat (7) being sleeved on the rear end of the support tube (2) via the first connection channel, a connection tube (8) being provided in the second connection channel, a mounting notch being provided at the bottom of the connection seat (7) and communicating with the second connection channel, and the rear caster unit (4) being rotatably connected to the connection tube (8) at the mounting notch position.

7. The foldable trolley with multiple transport modes according to claim 6, characterized in that: The rear caster unit (4) comprises a rotating block (41), a second torsion spring (45), a caster frame (42) and a rear caster (44); the rotating block (41) is placed in the installation notch and is rotatably connected to the connecting pipe (8); one end of the caster frame (42) is connected and fixed to the rotating block (41); the second torsion spring (45) is sleeved on the connecting pipe (8) and one end of the second torsion spring (45) is in contact with the connecting seat (7) and the other end is in contact with the rotating block (41); the other end of the caster frame (42) is provided with a rear wheel shaft (43); and the rear caster (44) is rotatably connected to the rear wheel shaft (43).

8. The foldable trolley with multiple transport modes according to claim 7, characterized in that: The inner side surface of the connecting seat (7) is provided with a pivot hole (71), a first positioning hole (72) and a second positioning hole (73); the pushing handle (6) is pivotally connected to the pivot hole (71); a locking mechanism is provided at the bottom of the pushing handle (6); the locking mechanism cooperates with the first positioning hole (72) when the pushing handle (6) is rotated relative to the load-bearing component to a relatively upright state, and cooperates with the second positioning hole (73) when the pushing handle (6) is rotated relative to the load-bearing component to an open position of about 180 degrees.

9. The foldable trolley with multiple transport modes according to claim 8, characterized in that: The push handle (6) comprises two vertical tubes (61), the top ends of the two vertical tubes (61) are connected to a second horizontal tube (63) for a user to grasp, the lower parts of the two vertical tubes (61) are both sleeved with a lower connecting sleeve (64), the push handle (6) is pivotally connected to the pivot hole (71) of the connecting seat (7) by means of screws passing through the lower connecting sleeve (64) and the vertical tubes (61), a first horizontal tube (62) is connected between the two lower connecting sleeves (64), the locking mechanism comprises a locking rod (67) disposed in the first horizontal tube (62), a pressure spring (66), and a control button (65) disposed outside the first horizontal tube (62) and connected to the locking rod (67), the vertical tube (61) is provided with an avoidance hole at a position corresponding to the locking rod (67), and the end of the locking rod (67) can pass through the avoidance hole and cooperate with the first positioning hole (72) and the second positioning hole (73) to lock the push handle (6).

10. The foldable trolley with multiple transport modes according to claim 1, characterized in that: The shovel plate (5) is provided with a pivot seat (51) at a position corresponding to the front ends of the two support tubes (2); the pivot seat (51) is pivotally connected to the front ends of the support tubes (2); a compression spring (53) and a positioning pin (52) are sequentially embedded in the front end tube of the support tube (2); and the positioning pin (52) can abut against the seat wall of the pivot seat (51) of the shovel plate (5) under the action of the compression spring (53).

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