Lifting trolley for convenient stacking

Abstract

The application discloses a lifting trolley convenient to stack and store, which comprises a left supporting plate and a right supporting plate, a left baffle frame is fixedly installed on the upper side of the left supporting plate, a plurality of fixed handles are fixedly installed on the left side wall of the left baffle frame, the trolley is convenient to move, a right baffle frame is fixedly installed on the upper side of the right supporting plate, two universal wheels are fixedly installed on the lower sides of the left supporting plate and the right supporting plate, a movable baffle assembly is installed on the rear side of the left baffle frame, a cross beam is rotatably connected to the upper side of the right baffle frame through a rotating shaft, a middle moving assembly is installed in the middle side of the cross beam, the left side of the cross beam is arranged on the lower side of the left baffle frame, a turnover assembly is arranged on the left side of the cross beam, and a slot is arranged in the middle side of the cross beam. The trolley can be folded in one step, the fixed wheels are lifted up at the same time of folding, the trolley can be quickly stacked, after the trolley is parked and stored, the trolley can be quickly unfolded in one step to carry out logistics operation, and the egress operation efficiency is high.

Description

Technical Field

[0001] This invention relates to the field of logistics trolley technology, specifically to a lifting trolley that facilitates stacking and storage. Background Technology

[0002] A six-wheeled trolley typically refers to a trolley with six wheels, also known as a six-wheeled pushcart. It is commonly used in logistics transportation, warehousing and handling, and industrial production. It can carry and transport goods. After transportation, logistics trolleys are usually parked in a specific area for easy management. Clearly defined storage and parking areas for logistics trolleys are designated in warehouses or logistics sites to ensure sufficient space and easy management. Logistics trolleys are parked neatly according to certain rules to ensure that the parking area is free of obstacles and that passageways are unobstructed, so as to avoid affecting personnel passage and logistics operations.

[0003] Patent No. CN202321052508.7 proposes a logistics trolley that is easy to store, including a fixed frame. Connecting plates are fixed on both sides of the front of the fixed frame, and a movable frame is hinged to the front of the connecting plates. A support platform is hinged to the lower part of the front of the fixed frame. A fixing groove is opened on the back of the support platform, and an adjustment structure is movably connected inside the fixing groove. A support plate is provided behind the adjustment structure, and the support plate is slidably connected to the inner wall of the fixing groove, which has an auxiliary support function. It can support the entire logistics trolley after it is folded, so as to prevent the trolley from tipping over. The logistics trolleys can also be simply fixed together. However, this patent has too many folding steps, the folding speed is slow, and after storage and parking, it cannot be quickly unfolded in one step for logistics operations, resulting in low efficiency of unloading operations.

[0004] Therefore, this invention designs a lifting trolley that is convenient for stacking and storage to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a lifting trolley that is easy to stack and store, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A convenient stackable and foldable lifting trolley includes a left support plate and a right support plate. A left baffle frame is fixedly installed on the upper side of the left support plate, and multiple fixed handles are fixedly installed on the left side wall of the left baffle frame for easy movement of the trolley. A right baffle frame is fixedly installed on the upper side of the right support plate. Two omnidirectional wheels are fixedly installed on the lower side of both the left and right support plates. A movable baffle assembly is installed on the rear side of the left baffle frame. A crossbeam is rotatably connected to the upper side of the right support plate via a pivot. A central moving component is installed on the middle side of the crossbeam. The left side of the crossbeam is located under the left baffle frame, and a flipping component is provided on the left side of the crossbeam. A slot is provided on the middle side of the crossbeam.

[0007] As a further embodiment of the present invention: the flipping assembly includes: a sliding frame, a connecting plate, a plastic base plate, an irregularly shaped rotating rod, and a locking handle. The sliding frame is slidably connected to the lower side of the left baffle frame. The two connecting plates are rotatably connected to the front and rear side walls of the sliding frame via a rotating shaft. The plastic base plate is fixedly installed on the upper side of the connecting plates. An irregularly shaped rotating rod is rotatably connected to the lower side of the left baffle frame via a rotating shaft on the lower side of each connecting plate. The end of the irregularly shaped rotating rod away from the connecting plate is rotatably connected to the lower side of the left baffle frame via a rotating shaft. The locking handle is rotatably connected to the upper side of the left baffle frame via a rotating shaft. A slot is provided on the upper side of the plastic base plate to accommodate the locking handle and lock the plastic base plate.

[0008] As a further embodiment of the present invention: the movable baffle assembly includes: a middle baffle frame, a sliding extension plate, a limiting screw, and a fixing pin. The right side of the middle baffle frame is rotatably connected to the right baffle frame via a pivot. The sliding extension plate is slidably connected to the left side of the middle baffle frame. A strip-shaped slot is provided on the middle side of the sliding extension plate. The limiting screw passes through the strip-shaped slot and is fixedly installed on the middle baffle frame. One end of the sliding extension plate away from the middle baffle frame is slidably connected to the left baffle frame. An opening is provided on the left baffle frame. One end of the fixing pin is slidably connected to the opening, and the other end of the fixing pin is fixedly connected to the side wall of the sliding extension plate. The lower side of the middle baffle frame is fixedly installed on the upper side of the crossbeam via a bracket to improve the stability of the plastic base plate. Multiple openings are provided on the right side of the middle baffle frame to accommodate the right baffle bracket, facilitating the stacking of the trolley.

[0009] As a further embodiment of the present invention: the central moving component includes: a central support plate, fixed wheels and buffer frames. The central support plate is fixedly installed on the middle side of the crossbeam. The two fixed wheels are symmetrically fixedly installed on the lower side of the central support plate along the central axis of the central support plate. The two buffer frames are symmetrically fixedly installed on the front and rear sides of the central support plate along the central axis of the central support plate.

[0010] As a further aspect of the present invention, a linkage component is installed on the middle support plate.

[0011] As a further aspect of the present invention: the linkage assembly includes: an L-shaped plate, a rotating plate, a first transmission rod, a tension spring, and a rotating disk. The L-shaped plate is rotatably connected to the middle side of the crossbeam via a rotating shaft, and the rotating plate is rotatably connected to the right side of the L-shaped plate via a rotating shaft. The first transmission rod is fixedly installed at the end of the rotating plate away from the L-shaped plate. One end of each of the two tension springs is symmetrically fixedly connected to the front and rear ends of the first transmission rod along the central axis. The other end of each tension spring is fixedly connected to a fixed wheel. A rotating disk is fixedly connected to the side of the rotating shaft of each fixed wheel closest to the central axis of the crossbeam. The rotating disk is provided with multiple slots, and both ends of the first transmission rod are located in the slots.

[0012] As a further aspect of the present invention, a foot pedal assembly is installed on the upper side of the left support plate.

[0013] As a further embodiment of the present invention: the foot pedal assembly includes: a fixed frame, a pull rod, a second transmission rod, a fixed bracket, a locking plate, an unlocking plate, and a torsion spring. The fixed frame is fixedly installed on the upper side of the left support plate. The pull rod is slidably connected in a slot on the middle side of the crossbeam. One end of the second transmission rod is fixedly connected to the left side of the pull rod, and the right side of the pull rod is close to the L-shaped plate. The fixed bracket is fixedly installed on the left support plate. The locking plate is rotatably connected to the fixed frame via a rotating shaft. The other end of the second transmission rod is fixedly connected to the lower side of the locking plate. The unlocking plate is rotatably connected to the fixed frame via a rotating shaft. Torsion springs are provided on the rotating shafts of both the locking plate and the unlocking plate. One end of each torsion spring is fixedly connected to the fixed bracket, and the other end of each torsion spring is fixedly connected to the side wall of the locking plate and the unlocking plate. A limiting shaft is fixedly installed on the locking plate. Two grooves, one above the other, are provided on the left side of the unlocking plate to accommodate the limiting shaft.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes a plastic base plate that rotates to the left, causing a connecting plate to rotate to the left. This rotation, in turn, causes a shaped rotating rod to rotate to the right. The end of the shaped rotating rod furthest from the connecting plate is rotatably connected to the lower side of the left baffle frame via a pivot. The rightward rotation of the rod causes the connecting plate to rotate and move upwards simultaneously. This upward movement of the connecting plate causes the sliding frame to move upwards, which in turn causes the left side of the crossbeam to move upwards. Rotating the locking handle to the right secures it against a slot on the upper side of the plastic base plate, fixing the base plate in place. This facilitates quick folding of the plastic base plate and allows for easy stacking between trolleys. The upward movement of the left side of the crossbeam causes the middle baffle frame to rotate to the upper left. The end of the sliding extension plate closest to the middle baffle frame rotates downwards while simultaneously sliding to the right. The end of the sliding extension plate closest to the left baffle frame rotates to the right while simultaneously sliding downwards. The upward sliding mechanism facilitates the rotation of the middle baffle frame along with the crossbeam, while also improving the stability of the plastic base plate under load. The upward movement of the left side of the crossbeam drives the middle support plate upward, which in turn drives the two fixed wheels upward, facilitating the lifting of the fixed wheels and enabling the lateral trolley to stack the components. The L-shaped plate rotates to the left, causing the rotating plate to move upward, which in turn drives the first transmission rod upward. The tension spring is stretched, and the upward movement of the first transmission rod causes it to leave the slot of the rotating disc, allowing the rotating disc to rotate and the fixed wheels to disengage from their braking state, which facilitates the quick closing or opening of the fixed wheels. This invention can be folded in one step, and the fixed wheels rise simultaneously during folding, allowing for rapid stacking. After being stored and docked, it can be quickly unfolded for logistics operations, resulting in high efficiency in outbound operations. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 2 for Figure 1 Enlarged view of A in the middle; Figure 3 This is a front view of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the present invention in its folded state. Figure 1 ; Figure 5 This is a schematic diagram of the three-dimensional structure of the present invention in its folded state. Figure 2 ; Figure 6 for Figure 5 Enlarged view of B in the middle; Figure 7 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 8 for Figure 7 Enlarged view of C in the middle; Figure 9 This is a cross-sectional view of the linkage component of the present invention; Figure 10 This is a schematic diagram of the foot pedal assembly of the present invention; Figure 11 This is a cross-sectional view of the foot pedal assembly of the present invention; Figure 12 This is a schematic diagram of the structure of multiple devices stacked together according to the present invention.

[0016] In the diagram: 1. Left support plate; 2. Right support plate; 3. Left baffle frame; 4. Right baffle frame; 5. Movable baffle assembly; 51. Middle baffle frame; 52. Sliding extension plate; 53. Restricting screw; 54. Fixing pin; 6. Crossbeam; 7. Middle moving assembly; 71. Middle support plate; 72. Fixed wheel; 8. Flipping assembly; 81. Sliding frame; 82. Connecting plate; 83. Plastic base plate; 84. Irregularly shaped rotating rod; 85. Locking handle; 9. Linkage assembly; 91. L-shaped plate; 92. Rotating plate; 93. First transmission rod; 94. Tension spring; 95. Rotating disc; 10. Foot pedal assembly; 11. Fixing frame; 12. Pull rod; 13. Second transmission rod; 14. Fixing bracket; 15. Locking plate; 16. Unlocking plate; 17. Restricting shaft. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] The present invention will be further described below with reference to embodiments.

[0019] The terms "left," "right," "front," "back," "up," and "down" used in the following description refer to the orientation from the perspective of the front view. Example

[0020] Please see Figures 1-12 In this embodiment of the invention, a lifting trolley that is convenient for stacking and storage includes a left support plate 1 and a right support plate 2. A left baffle frame 3 is fixedly installed on the upper side of the left support plate 1. Multiple fixed handles are fixedly installed on the left side wall of the left baffle frame 3 to facilitate moving the trolley. A right baffle frame 4 is fixedly installed on the upper side of the right support plate 2. Two universal wheels are fixedly installed on the lower side of both the left support plate 1 and the right support plate 2. A movable baffle assembly 5 is installed on the rear side of the left baffle frame 3. A crossbeam 6 is rotatably connected to the upper side of the right support plate 2 through a pivot. A middle moving assembly 7 is installed on the middle side of the crossbeam 6. The left side of the crossbeam 6 is located on the lower side of the left baffle frame 3. A flipping assembly 8 is provided on the left side of the crossbeam 6. A slot is provided on the middle side of the crossbeam 6. The flipping assembly 8 includes: a sliding frame 81, a connecting plate 82, a plastic base plate 83, an irregularly shaped rotating rod 84, and a locking handle 85. The sliding frame 81 is slidably connected to the lower side of the left baffle frame 3. The two connecting plates 82 are rotatably connected to the front and rear side walls of the sliding frame 81 via a rotating shaft. The plastic base plate 83 is fixedly installed on the upper side of the connecting plate 82. An irregularly shaped rotating rod 84 is rotatably connected to the lower side of the left baffle frame 3 via a rotating shaft. The end of the irregularly shaped rotating rod 84 away from the connecting plate 82 is rotatably connected to the lower side of the left baffle frame 3 via a rotating shaft. The locking handle 85 is rotatably connected to the upper side of the left baffle frame 3 via a rotating shaft. The upper side of the plastic base plate 83 is provided with a slot to accommodate the locking handle 85 and lock the plastic base plate 83. The plastic base plate 83 rotates to the left, causing the connecting plate 82 to rotate to the left. The connecting plate 82 rotates to the left, causing the irregular rotating rod 84 to rotate to the right. The end of the irregular rotating rod 84 away from the connecting plate 82 is rotatably connected to the lower side of the left baffle frame 3 via a rotating shaft. The irregular rotating rod 84 rotates to the right, causing the connecting plate 82 to rotate and move upward. The upward movement of the connecting plate 82 causes the sliding frame 81 to move upward. The upward movement of the sliding frame 81 causes the left side of the crossbeam 6 to move upward. The locking handle 85 is rotated to the right, and the locking handle 85 is pressed tightly against the slot on the upper side of the plastic base plate 83 to fix the plastic base plate 83. This facilitates the quick folding of the plastic base plate 83 and makes it easy to stack between trolleys. The movable baffle assembly 5 includes: a middle baffle frame 51, a sliding extension plate 52, a limiting screw 53, and a fixing pin 54. The right side of the middle baffle frame 51 is rotatably connected to the right baffle frame 4 via a pivot. The sliding extension plate 52 is slidably connected to the left side of the middle baffle frame 51. A strip-shaped slot is provided on the middle side of the sliding extension plate 52. The limiting screw 53 passes through the strip-shaped slot and is fixedly installed on the middle baffle frame 51. The end of the sliding extension plate 52 away from the middle baffle frame 51 is slidably connected to the left baffle frame 3. An opening is provided on the left baffle frame 3. One end of the fixing pin 54 is slidably connected to the opening, and the other end of the fixing pin 54 is fixedly connected to the side wall of the sliding extension plate 52. The lower side of the middle baffle frame 51 is fixedly installed on the upper side of the crossbeam 6 via a bracket to improve the stability of the plastic base plate 83. Multiple openings are provided on the right side of the middle baffle frame 51 to accommodate the right baffle bracket, which facilitates the stacking of the trolley. The upward movement of the left side of the crossbeam 6 causes the middle baffle frame 51 to rotate to the upper left. The end of the sliding extension plate 52 near the middle baffle frame 51 rotates downward and slides to the right. The end of the sliding extension plate 52 near the left baffle frame 3 rotates to the right and slides upward. This helps the middle baffle frame 51 to rotate with the crossbeam 6 and improves the stability of the plastic base plate 83 under load. Example

[0021] like Figure 1-12 As shown, in a preferred embodiment of the present invention, the central moving component 7 includes: a central support plate 71, fixed wheels 72 and buffer frames. The central support plate 71 is fixedly installed on the middle side of the crossbeam 6. The two fixed wheels 72 are symmetrically fixedly installed on the lower side of the central support plate 71 along the central axis of the central support plate 71. The two buffer frames are symmetrically fixedly installed on the front and rear sides of the central support plate 71 along the central axis of the central support plate 71. The upward movement of the left side of the crossbeam 6 causes the middle support plate 71 to move upward, and the upward movement of the middle support plate 71 causes the two fixed wheels 72 to move upward, which is beneficial to lifting the fixed wheels 72 and making it easier for the transverse trolley to stack. A linkage component 9 is installed on the middle support plate 71; The linkage component 9 includes: an L-shaped plate 91, a rotating plate 92, a first transmission rod 93, a tension spring 94, and a rotating disk 95. The L-shaped plate 91 is rotatably connected to the middle side of the crossbeam 6 via a rotating shaft. The rotating plate 92 is rotatably connected to the right side of the L-shaped plate 91 via a rotating shaft. The first transmission rod 93 is fixedly installed at the end of the rotating plate 92 away from the L-shaped plate 91. One end of each tension spring 94 is symmetrically fixedly connected to the front and rear ends of the first transmission rod 93 along the central axis. The other end of each tension spring 94 is fixedly connected to a fixed wheel 72. A rotating disk 95 is fixedly connected to the side of the rotating shaft of each fixed wheel 72 closest to the central axis of the crossbeam 6. The rotating disk 95 is provided with multiple slots, and the two ends of the first transmission rod 93 are set in the slots. The L-shaped plate 91 rotates to the left, causing the rotating plate 92 to move upward. The upward movement of the rotating plate 92 causes the first transmission rod 93 to move upward, and the tension spring 94 is stretched. The upward movement of the first transmission rod 93 causes the first transmission rod 93 to leave the slot of the rotating disk 95, so that the rotating disk 95 can be rotated, and the fixed wheel 72 is released from the brake state, which is conducive to quickly closing or opening the fixed wheel 72. A foot pedal assembly 10 is installed on the upper side of the left support plate 1; The foot pedal assembly 10 includes: a fixed frame 11, a pull rod 12, a second transmission rod 13, a fixed bracket 14, a locking plate 15, an unlocking plate 16, and a torsion spring. The fixed frame 11 is fixedly installed on the upper side of the left support plate 1. The pull rod 12 is slidably connected to the slot in the middle side of the crossbeam 6. One end of the second transmission rod 13 is fixedly connected to the left side of the pull rod 12, and the right side of the pull rod 12 is close to the L-shaped plate 91. The fixed bracket 14 is fixedly installed on the left support plate 1. The locking plate 15 is rotatably connected to the fixed frame 11 via a rotating shaft. The other end of the second transmission rod 13 is fixedly connected to the lower side of the locking plate 15. The unlocking plate 16 is rotatably connected to the fixed frame 11 via a rotating shaft. Torsion springs are provided on the rotating shafts of both the locking plate 15 and the unlocking plate 16. One end of each torsion spring is fixedly connected to the fixed bracket 14, and the other end is fixedly connected to the side wall of the locking plate 15 and the unlocking plate 16. A limiting shaft 17 is fixedly installed on the locking plate 15. The left side of the unlocking plate 16 has two grooves, one above the other, for accommodating the limiting shaft 17. The locking plate 15 rotates to the lower left, causing the second transmission rod 13 to move to the upper right. Simultaneously, the limiting shaft 17 on the locking plate 15 moves to the lower left and enters the groove on the lower side of the unlocking plate 16. The torsion spring on the rotating shaft of the locking plate 15 undergoes elastic deformation, fixing the locking plate 15. The second transmission rod 13 moves to the upper right, causing the pull rod 12 to move to the right. The pull rod 12 moves to the right, releasing the L-shaped plate 91. The L-shaped plate 91 rotates to the right, causing the rotating plate 92 to move downwards. The rotating plate 92 moves downwards, causing the first transmission rod 93 to move downwards, thus releasing the first transmission rod... 93 is pressed tightly against the slot of the rotating disc 95, locking the rotating disc 95 and putting the fixed wheel 72 into a braking state. The unlocking plate 16 rotates to the lower left, causing the limiting shaft 17 on the locking plate 15 to leave the lower groove of the unlocking plate 16 and enter the upper groove of the unlocking plate 16. The torsion spring on the rotating shaft of the locking plate 15 returns to its original position, pushing the locking plate 15 back to its initial position. This causes the second transmission rod 13 to move to the left, which in turn drives the pull rod 12 to move to the left, allowing the fixed wheel 72 to be locked quickly. The single-foot quick press operation is beneficial for quickly closing or opening the fixed wheel 72.

[0022] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lifting trolley for easy stacking and storage, comprising a left support plate (1) and a right support plate (2), characterized in that, A left baffle frame (3) is fixedly installed on the upper side of the left support plate (1). Multiple fixed handles are fixedly installed on the left side wall of the left baffle frame (3). A right baffle frame (4) is fixedly installed on the upper side of the right support plate (2). Two universal wheels are fixedly installed on the lower side of both the left support plate (1) and the right support plate (2). A movable baffle assembly (5) is installed on the rear side of the left baffle frame (3). A crossbeam (6) is rotatably connected to the upper side of the right support plate (2) through a rotating shaft. A middle moving assembly (7) is installed on the middle side of the crossbeam (6). The left side of the crossbeam (6) is located on the lower side of the left baffle frame (3). A flipping assembly (8) is located on the left side of the crossbeam (6). The flipping assembly (8) includes: a sliding frame (81), a connecting plate (82), a plastic base plate (83), a shaped rotating rod (84), and a locking handle (85). The sliding frame (81) is slidably connected to the lower side of the left baffle frame (3). The two connecting plates (82) are rotatably connected to the front and rear side walls of the sliding frame (81) via a rotating shaft. The plastic base plate (83) is fixedly installed on the upper side of the connecting plate (82). The lower side of each connecting plate (82) is rotatably connected to a shaped rotating rod (84) via a rotating shaft. The end of the shaped rotating rod (84) away from the connecting plate (82) is rotatably connected to the lower side of the left baffle frame (3) via a rotating shaft. The locking handle (85) is rotatably connected to the upper side of the left baffle frame (3) via a rotating shaft. The movable baffle assembly (5) includes: a middle baffle frame (51), a sliding extension plate (52), a limiting screw (53), and a fixing pin (54). The right side of the middle baffle frame (51) is rotatably connected to the right baffle frame (4) via a rotating shaft. The sliding extension plate (52) is slidably connected to the left side of the middle baffle frame (51). A strip-shaped slot is provided on the middle side of the sliding extension plate (52). The limiting screw (53) passes through the strip-shaped slot and is fixedly installed on the middle baffle frame (51). One end of the sliding extension plate (52) away from the middle baffle frame (51) is slidably connected to the left baffle frame (3). An opening is provided on the left baffle frame (3). One end of the fixing pin (54) is slidably connected to the opening. The other end of the fixing pin (54) is fixedly connected to the side wall of the sliding extension plate (52). The lower side of the middle baffle frame (51) is fixedly installed on the upper side of the crossbeam (6) via a bracket.

2. The convenient stacking and storage lifting trolley according to claim 1, characterized in that, The central moving component (7) includes: a central support plate (71), fixed wheels (72) and a buffer frame. The central support plate (71) is fixedly installed on the middle side of the crossbeam (6). The two fixed wheels (72) are symmetrically fixedly installed on the lower side of the central support plate (71) along the central axis. The two buffer frames are symmetrically fixedly installed on the front and rear sides of the central support plate (71) along the central axis.

3. The convenient stacking and storage lifting trolley according to claim 2, characterized in that, A linkage component (9) is installed on the middle support plate (71).

4. The convenient stacking and storage lifting trolley according to claim 3, characterized in that, The linkage assembly (9) includes: an L-shaped plate (91), a rotating plate (92), a first transmission rod (93), a tension spring (94), and a rotating disk (95). The L-shaped plate (91) is rotatably connected to the middle side of the crossbeam (6) via a rotating shaft. The rotating plate (92) is rotatably connected to the right side of the L-shaped plate (91) via a rotating shaft. The first transmission rod (93) is fixedly installed at one end of the rotating plate (92) away from the L-shaped plate (91). One end of each of the two tension springs (94) is symmetrically fixedly connected to the front and rear ends of the first transmission rod (93) along the central axis of the first transmission rod (93). The other end of each tension spring (94) is fixedly connected to a fixed wheel (72). A rotating disk (95) is fixedly connected to the side of the rotating shaft of each fixed wheel (72) near the central axis of the crossbeam (6).

5. The convenient stacking and storage lifting trolley according to claim 4, characterized in that, A foot pedal assembly (10) is installed on the upper side of the left support plate (1).

6. The convenient stacking and storage lifting trolley according to claim 5, characterized in that, The foot pedal assembly (10) includes: a fixed frame (11), a pull rod (12), a second transmission rod (13), a fixed bracket (14), a locking plate (15), an unlocking plate (16), and a torsion spring. The fixed frame (11) is fixedly installed on the upper side of the left support plate (1). The pull rod (12) is slidably connected in the slot on the middle side of the crossbeam (6). One end of the second transmission rod (13) is fixedly connected to the left side of the pull rod (12). The right side of the pull rod (12) is close to the L-shaped plate (91). The fixed bracket (14) is fixedly installed on the left support plate (1). The locking plate (15) is rotatably connected to the fixed frame (11) via a rotating shaft. The other end of the second transmission rod (13) is fixedly connected to the lower side of the locking plate (15). The unlocking plate (16) is rotatably connected to the fixed frame (11) via a rotating shaft. Torsion springs are provided on the rotating shafts of the locking plate (15) and the unlocking plate (16). A limiting shaft (17) is fixedly installed on the locking plate (15).

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