A foldable trolley for moving aluminum doors and windows

Abstract

This application discloses a foldable trolley for transporting aluminum doors and windows, comprising: a base block, a top block, folding telescopic components, an unfolding and folding drive assembly, a first caster, and a second caster. The base block has four sections, with a top block on top of each section. The four folding telescopic components are positioned at the front, rear, left, and right of the foldable trolley, respectively, and are connected to the top and base blocks. The unfolding and folding drive assembly is located at the center of the bottom of the foldable trolley and includes four threaded rods, each positioned around the trolley. The threaded rods on the same vertical plane have different heights, and one end of each threaded rod is fixedly connected to the base block. The advantage of this application is its folding function, allowing for multi-directional folding. After use, it can be folded up, reducing storage space.

Description

Technical Field

[0001] This invention relates to a foldable trolley, specifically a foldable trolley for transporting aluminum doors and windows, belonging to the field of aluminum door and window transport technology. Background Technology

[0002] Aluminum alloy doors and windows refer to doors and windows made of aluminum alloy extruded profiles as frames, mullions, and sashes, or simply aluminum doors and windows. Aluminum alloy doors and windows include those with aluminum alloy as the load-bearing member (the member that bears and transmits its own weight and load) and those made of wood or plastic composites, or simply aluminum-wood composite doors and windows and aluminum-plastic composite doors and windows. Aluminum alloy doors and windows are transported and handled using trolleys.

[0003] The existing patent document "CN214985509U Trolley" can be used for transporting aluminum doors and windows, but it cannot be folded and folded up. After use, it cannot reduce the space occupied, and its overall size is large, taking up a lot of space, which causes inconvenience. Currently, there is no foldable trolley for transporting aluminum doors and windows. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this application provides a foldable trolley for transporting aluminum doors and windows. This folding trolley features a multi-directional folding mechanism, allowing four telescopic folding sections to converge towards the center. When in use, it can be unfolded for carrying and placing aluminum doors and windows. After use, it can be folded up for storage, reducing its storage space requirements and improving overall usability. This addresses the problem of trolleys occupying too much space in existing technologies.

[0005] Furthermore, to address the lack of a self-locking design after adjustment, locking is achieved through the meshing transmission between the worm gear and the worm.

[0006] According to one aspect of this application, a foldable trolley for transporting aluminum doors and windows is provided. The foldable trolley includes: a base block, a top block, folding telescopic components, an unfolding / folding drive assembly, a first caster, and a second caster. The base block consists of four parts arranged in a rectangular array on a horizontal plane. Each of the four base blocks has a top block on its top, and the four top blocks are arranged in a rectangular array on a horizontal plane. The folding telescopic components are also four, respectively positioned at the front, rear, left, and right of the foldable trolley. The folding telescopic component is connected to the top block and the bottom block; the unfolding folding drive assembly is located at the center of the bottom of the foldable trolley, and the unfolding folding drive assembly includes: a middle disc and threaded rods, the number of which is four, and the four threaded rods are respectively arranged around the unfolding folding drive assembly. The four threaded rods are distributed in a cross shape, wherein the heights of the threaded rods located on the same vertical plane are different, and one end of the threaded rod is fixedly connected to the bottom block; a plurality of first casters arranged in a circular array are installed at the bottom of the middle disc; a second caster is installed at the bottom of the bottom block.

[0007] Furthermore, the folding telescopic component includes: multiple cross rods, a first connecting piece, and a second connecting piece. Each cross rod is composed of two intersecting rods, with a hinge shaft between the middle portions of the two rods, and the two rods are hinged together via the hinge shaft. A second connecting piece is provided between the rods of two adjacent cross rods, and the end of the rod is hinged to the second connecting piece. The rods of the cross rods are connected to the top block and the bottom block via the first connecting piece, which is fixedly connected to the top block and the bottom block. The first connecting piece is hinged to one end of a rod of the cross rod.

[0008] Furthermore, a push-pull rod is fixedly installed on one of the base blocks, forming an angle of 70 to 80 degrees with the horizontal plane. A handle is fixedly installed on the top of the push-pull rod, and a silicone grip sleeve is fixedly fitted onto the handle. A control panel is fixedly installed on one side wall of the top of the push-pull rod. A power supply is provided inside the intermediate plate.

[0009] Furthermore, the unfolding and folding drive assembly also includes: two first fixed seats, two second fixed seats, an internally threaded rotating seat, an outer ring body, and a worm gear; the first fixed seats and the second fixed seats are both fixedly installed at the bottom of the intermediate disc body, and both the first fixed seats and the second fixed seats are provided with a rotary groove; the internally threaded rotating seat is a cylindrical structure, and an internal thread is provided on the inner wall of the internally threaded rotating seat; the outer ring body and the worm gear are fixedly sleeved on the outer wall of the internally threaded rotating seat; the internally threaded rotating seat and the outer ring body are connected to the rotary groove with a clearance fit, and the internally threaded rotating seat is threadedly connected to the threaded rod through the internal thread.

[0010] Furthermore, the second fixed seat has a through hole, the diameter of which is larger than the diameter of the threaded rod, and the through hole is a through hole type structure.

[0011] Furthermore, the intermediate disk body has an inner cavity, a drive motor is fixedly installed on the top cavity wall of the inner cavity, a connecting shaft is fixedly installed on the output shaft of the drive motor, the bottom end of the connecting shaft is rotatably installed with the bottom cavity wall of the inner cavity, a first cylindrical gear is fixedly sleeved on the connecting shaft, four second cylindrical gears are meshed with the first cylindrical gear, and a rotating shaft is fixedly installed in the middle of the second cylindrical gears, the rotating shaft is rotatably installed inside the inner cavity.

[0012] Furthermore, a worm is fixedly connected to the bottom end of the rotating shaft, and the worm is meshed with the worm wheel. The top end of the worm is rotatably mounted to the bottom of the intermediate disk. A mounting bracket is also fixedly mounted to the bottom of the intermediate disk, and the bottom of the mounting bracket is rotatably mounted to the bottom end of the worm.

[0013] Furthermore, four notches are provided on the top edge of the intermediate disc, and a carrier bar is hingedly installed in the notch.

[0014] Furthermore, end shafts are fixedly installed on both sides of the carrier bar near the notch. The end shafts pass through an inlet hole opened in the notch wall, and the inlet hole communicates with a circular cavity. The circular cavity extends into the interior of the intermediate disk. One end of the end shaft is fixedly connected to a disk body, and the disk body is connected to the circular cavity. Multiple first magnetic blocks arranged in a circular array are fixedly fitted on the disk surface of the disk body near the inlet hole. The first magnetic blocks are aligned with repulsive second magnetic blocks, and the second magnetic blocks are fixedly connected to the cavity wall of the circular cavity near the inlet hole.

[0015] Furthermore, a compression spring is fixedly installed on the cavity wall at the end of the cavity away from the inlet hole, and a pressure plate is fixedly connected to one end of the compression spring, with the pressure plate pressing against the surface of the disc body.

[0016] The advantages of this application are: compared with the trolley in the prior art, the foldable trolley for transporting aluminum doors and windows has a folding function, which can be folded in multiple directions on all four sides, allowing the four folding telescopic parts to be gathered towards the middle. When in use, it can be unfolded for carrying and placing aluminum doors and windows during transport. After use, when storing the whole thing, it can be folded up to reduce the storage space occupied, resulting in a better overall performance.

[0017] The unfolding and folding drive component provides the drive, which can gather towards the center from all four directions or unfold outwards. The drive is carried out synchronously, and after the drive is performed, it can be self-locked, which improves the stability after adjustment.

[0018] The addition of a flip-up carrier bar allows it to flip horizontally after being unfolded, facilitating load-bearing and preventing heavy objects from contacting the threaded rod. When not occupying space during storage, the carrier bar can be folded up to flip vertically and avoid obstruction. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of a foldable trolley for transporting aluminum doors and windows according to this application;

[0021] Figure 2 This is a structural schematic diagram of the folding telescopic component, the bottom block, and the top block in this application;

[0022] Figure 3 This is a structural diagram of the top of the intermediate disk and the surrounding area of ​​the intermediate disk in this application;

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the intermediate disk and the bottom of the intermediate disk in this application;

[0024] Figure 5 This is a schematic diagram of the connection structure between the worm gear and the worm in this application;

[0025] Figure 6 This is a schematic diagram of the bottom structure of the intermediate disk in this application;

[0026] Figure 7 This is a schematic diagram of the distribution structure of the carrier strips in this application;

[0027] Figure 8 This is a schematic diagram of the installation structure of the carrier strip in this application;

[0028] Figure 9 This is a schematic diagram of the distribution structure of the first magnetic block in this application.

[0029] The meanings of the reference numerals in the figure are as follows: 1. Bottom block; 2. Top block; 3. Intermediate disc; 301. Inner cavity; 4. Folding telescopic component; 401. Rod; 402. First connecting piece; 403. Second connecting piece; 5. Notch; 6. Carrier bar; 7. Push-pull rod; 8. Handle; 9. Control panel; 10. Threaded rod; 11. Drive motor; 12. First cylindrical gear; 13. Rotating shaft; 14. Second cylindrical gear; 15. First fixed seat; 16. Second fixed seat; 17. Through rod hole; 18. Internal threaded rotating seat; 19. Outer ring; 20. Rotary groove; 21. Worm gear; 22. Worm; 23. Mounting bracket; 24. First caster; 25. End shaft; 26. Circular cavity; 27. Inlet hole; 28. Disc body; 29. ​​Compression spring; 30. Pressure plate; 31. First magnet; 32. Second magnet; 33. Second caster. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0031] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0033] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0034] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] Reference Figures 1 to 9 A foldable trolley for transporting aluminum doors and windows, the foldable trolley comprising: a base block 1, a top block 2, a folding telescopic component 4, an unfolding and folding drive assembly, a first caster 24, and a second caster 33.

[0037] In specific implementation, there are four base blocks 1, arranged in a rectangular array on a horizontal plane. Each of the four base blocks 1 has a top block 2, which are also arranged in a rectangular array on a horizontal plane. There are four folding telescopic components 4, positioned at the front, rear, left, and right of the foldable trolley. Each folding telescopic component 4 is connected to the top block 2 and the base block 1. The unfolding and folding drive assembly is located at the center of the bottom of the foldable trolley. The component includes four threaded rods 10, which are respectively arranged around the unfolding and folding drive assembly. The four threaded rods 10 are arranged in a cross shape, and the threaded rods 10 on the same vertical plane have different heights. One end of each threaded rod 10 is fixedly connected to the base block 1. By adjusting the position between the threaded rod 10 and the middle disc 3, the overall folding and unfolding can be adjusted. The two threaded rods 10 on the same vertical plane have different heights, thereby preventing the threaded rods 10 from moving during adjustment and causing obstruction, thus avoiding affecting the use.

[0038] like Figure 1As shown, the bottom of the intermediate disc 3 is equipped with a plurality of first casters 24 arranged in a circular array; the bottom of the base block 1 is equipped with second casters 33, which can move on the ground through the first casters 24 and the second casters 33, thus realizing the movement of the whole.

[0039] The folding telescopic component 4 includes: multiple cross rods, a first connecting piece 402, and a second connecting piece 403. Each cross rod is composed of two intersecting rods 401, with a hinge shaft between the middle of the two rods 401, and the two rods 401 are hinged together by the hinge shaft. A second connecting piece 403 is provided between two adjacent cross rods 401, and the end of the rod 401 is hinged to the second connecting piece 403. The rods 401 of the cross rods are connected to the top block 2 and the bottom block 1 through the first connecting piece 402. The first connecting piece 402 is fixedly connected to the top block 2 and the bottom block 1, and is hinged to one end of the rod 401 of the cross rods. When the bottom block 1 moves, it can drive the folding telescopic component 4 to move, allowing the folding telescopic component 4 to extend and retract, thereby meeting the overall folding requirements and further providing obstruction and limitation around the edges. When the aluminum door and window are under load, it prevents them from detaching and provides limitation around the edges.

[0040] like Figure 1 As shown, as a specific technical solution, a push-pull rod 7 is fixedly installed on one of the base blocks 1. The push-pull rod 7 forms an angle of 70 to 80 degrees with the horizontal plane. A handle 8 is fixedly installed on the top of the push-pull rod 7, and a silicone grip sleeve is fixedly fitted on the handle 8. A control panel 9 is fixedly installed on one side wall of the top of the push-pull rod 7. A power supply is provided inside the middle disc 3, which provides the overall push-pull position. The entire body can be moved by holding the handle 8 and pushing or pulling the handle 8. The control panel 9 provides overall control. The control panel 9 has a controller inside, which can be a single-chip microcomputer controller. It also has control buttons on the outside for operation. The power supply provides power to the entire body.

[0041] like Figures 3 to 5As shown, as a specific technical solution, the unfolding and folding drive assembly further includes: two first fixed seats 15, two second fixed seats 16, an internally threaded rotating seat 18, an outer ring body 19, and a worm gear 21; the first fixed seats 15 and the second fixed seats 16 are both fixedly installed at the bottom of the intermediate disk 3, and both the first fixed seats 15 and the second fixed seats 16 are provided with a rotary groove 20. The internally threaded rotating seat 18 has a cylindrical structure, and an internal thread is provided on the inner wall of the internally threaded rotating seat 18. The outer ring body 19 and the worm gear 21 are fixedly sleeved on the outer wall of the internally threaded rotating seat 18; the internally threaded rotating seat 18 is a cylindrical structure, and an internal thread is provided on the inner wall of the internally threaded rotating seat 18. The threaded rotating seat 18 and the outer ring body 19 are connected to the rotary groove 20 with a clearance fit. The internally threaded rotating seat 18 is threadedly connected to the threaded rod 10 through an internal thread. The second fixed seat 16 has a through hole 17, the diameter of which is larger than the diameter of the threaded rod 10, and the through hole 17 is a through hole structure, which is used for the threaded rod 10 to pass through. The intermediate disk body 3 has an inner cavity 301 inside. A drive motor 11 is fixedly installed on the top cavity wall of the inner cavity 301. A connecting shaft is fixedly installed on the output shaft of the drive motor 11, and the bottom end of the connecting shaft is connected to the inner cavity 301. The bottom cavity wall is rotatably mounted. A first cylindrical gear 12 is fixedly sleeved on the connecting shaft. The first cylindrical gear 12 meshes with four second cylindrical gears 14. A rotating shaft 13 is fixedly mounted in the middle of the second cylindrical gears 14. The rotating shaft 13 is rotatably mounted inside the inner cavity 301. A worm gear 22 is fixedly connected to the bottom end of the rotating shaft 13. The worm gear 22 meshes with the worm wheel 21. The top end of the worm gear 22 is rotatably mounted to the bottom of the intermediate disk 3. A mounting bracket 23 is also fixedly mounted to the bottom of the intermediate disk 3. The bottom of the mounting bracket 23 is rotatably mounted to the bottom end of the worm gear 22. This is achieved via a control panel. 9. The drive motor 11 drives the connecting shaft to rotate, causing the first cylindrical gear 12 to rotate. Through the meshing transmission between the first cylindrical gear 12 and the second cylindrical gear 14, multiple rotating shafts 13 rotate. The rotating shafts 13 drive the worm 22 to rotate. The worm 22 meshes with the worm wheel 21, causing the internal thread rotating seat 18 to rotate. The internal thread rotating seat 18 and the threaded rod 10 are screwed together, thereby driving the threaded rod 10 and the base block 1 to move together. The four base blocks 1 move together towards the middle disk 3 to complete the convergence, or move away from the middle disk 3 to achieve overall unfolding.

[0042] like Figures 7 to 9As shown, as a specific technical solution, four notches 5 are provided on the top edge of the intermediate disk 3, and a carrier strip 6 is hingedly installed in the notch 5; an end shaft 25 is fixedly installed on both sides of the carrier strip 6 near the notch 5, and the end shaft 25 passes through an inlet hole 27 opened in the wall of the notch 5. The inlet hole 27 communicates with a circular cavity 26, which extends into the interior of the intermediate disk 3. One end of the end shaft 25 is fixedly connected to a disk 28, and the disk 28 is connected to the circular cavity 26. A plurality of first magnetic blocks 31 arranged in a ring array are fixedly fitted on the disk surface of the disk 28 near the inlet hole 27. The first magnetic blocks 31 are aligned with repulsive second magnetic blocks 32. The cavity wall near the entrance hole 27 of the circular cavity 26 is fixedly connected; a compression spring 29 is fixedly installed on the cavity wall away from the entrance hole 27 of the circular cavity 26, and a pressure plate 30 is fixedly connected to one end of the compression spring 29. The pressure plate 30 presses against the surface of the circular disc 28. The carrier bar 6 can be flipped to adjust the angle, and can be adjusted to a horizontal or vertical state. The compression spring 29 provides compression force, so that the pressure plate 30 presses against the circular disc 28. At the same time, there is a magnetic repulsion between the first magnetic block 31 and the second magnetic block 32, which further provides pressure for the pressure plate 30 to press against the circular disc 28, increases the pressure between the two sets, thereby ensuring friction and providing a limit during rotation. When the carrier bar 6 is flipped to a vertical state, it can provide a limit to maintain the adjusted position.

[0043] Instructions for use: When using the foldable trolley for transporting aluminum doors and windows, first unfold the entire trolley, with the support bar 6 in a horizontal position. Lay the support bar 6 above the threaded rod 10, with one end of the support bar 6 resting on the base block 1. At this point, aluminum doors and windows can be placed in the trolley to provide support and facilitate transport. Place the aluminum doors and windows from the top of the foldable trolley to provide support. During transport, move the trolley using the first caster 24 and the second caster 33. After moving, remove the aluminum doors and windows from the top of the foldable trolley.

[0044] When the foldable trolley is not in use, it can be folded up for daily storage by adjustment, reducing storage space. Specifically, it is controlled by the control panel 9, which drives the drive motor 11 to rotate the connecting shaft, causing the first cylindrical gear 12 to rotate. Through the meshing transmission between the first cylindrical gear 12 and the second cylindrical gear 14, multiple rotating shafts 13 rotate, which in turn drive the worm gear 22 to rotate. The worm gear 22 meshes with the worm wheel 21, causing the internal thread rotating seat 18 to rotate. The internal thread rotating seat 18 and the threaded rod 10 are screwed together, thereby driving the threaded rod 10 and the base block 1 to move together. The four base blocks 1 move together towards the central disc 3 to complete the folding. Before folding, the carrier bar 6 is rotated by turning the lever to rotate it 90° to make it vertical to the horizontal plane, so as not to affect the movement of the base blocks 1. After adjustment, the worm wheel 21 and the worm gear 22 achieve self-locking.

[0045] When reused, the drive motor 11 is rotated via the control panel 9, causing the connecting shaft to rotate. This causes the first cylindrical gear 12 to rotate, and through the meshing transmission between the first cylindrical gear 12 and the second cylindrical gear 14, multiple rotating shafts 13 rotate. The rotating shafts 13 drive the worm gear 22 to rotate, and the worm gear 22 meshes with the worm wheel 21, causing the internal thread rotating seat 18 to rotate. The internal thread rotating seat 18 and the threaded rod 10 are screwed together, thereby driving the threaded rod 10 and the base block 1 to move together. The four base blocks 1 move away from the central disc 3 and unfold outwards. Before unfolding, the carrier bar 6 is rotated by turning the lever, causing the carrier bar 6 to rotate 90° and become parallel to the horizontal plane. One end of the carrier bar 6 contacts the top of the base block 1 to bear load and simultaneously block the threaded rod 10.

[0046] The above description is merely a specific embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A foldable trolley for transporting aluminum doors and windows, characterized in that: The foldable trolley includes: a base block (1), a top block (2), a folding telescopic component (4), an unfolding folding drive assembly, a first caster (24), and a second caster (33). The number of the bottom blocks (1) is four, and the four bottom blocks (1) are arranged in a rectangular array on a horizontal plane. Each of the four bottom blocks (1) is provided with a top block (2), and the four top blocks (2) are arranged in a rectangular array on a horizontal plane. The number of the folding telescopic parts (4) is four, and the four folding telescopic parts (4) are respectively provided in the front, back, left and right positions of the foldable trolley. The folding telescopic parts (4) are connected to the top blocks (2) and the bottom blocks (1). The unfolding and folding drive assembly is located at the center of the bottom of the foldable trolley. The unfolding and folding drive assembly includes: a middle disc (3) and threaded rods (10). There are four threaded rods (10), and the four threaded rods (10) are respectively arranged around the unfolding and folding drive assembly. The four threaded rods (10) are arranged in a cross shape. The threaded rods (10) located on the same vertical plane have different heights. One end of the threaded rod (10) is fixedly connected to the bottom block (1). The bottom of the intermediate disc (3) is equipped with a plurality of first casters (24) arranged in a circular array; the bottom of the base block (1) is equipped with second casters (33). The folding telescopic component (4) includes: multiple cross rods, a first connecting piece (402) and a second connecting piece (403). The cross rod is composed of two cross-arranged rods (401). A hinge shaft is provided between the middle parts of the two rods (401), and the two rods (401) are hinged through the hinge shaft. A second connecting piece (403) is provided between the rods (401) of two adjacent cross rods. The end of the rod (401) is hinged to the second connecting piece (403). The rod (401) of the cross rod is connected to the top block (2) and the bottom block (1) through the first connecting piece (402). The first connecting piece (402) is fixedly connected to the top block (2) and the bottom block (1). The first connecting piece (402) is hinged to one end of the rod (401) of the cross rod.

2. The foldable trolley for transporting aluminum doors and windows according to claim 1, characterized in that: One of the base blocks (1) is fixedly mounted with a push-pull rod (7), which forms an angle of seventy to eighty degrees with the horizontal plane. A handle (8) is fixedly mounted on the top of the push-pull rod (7), and a silicone grip sleeve is fixedly fitted on the handle (8). A control panel (9) is fixedly mounted on one side wall of the top of the push-pull rod (7). A power supply is provided inside the middle plate (3).

3. The foldable trolley for transporting aluminum doors and windows according to claim 1, characterized in that: The unfolding and folding drive assembly further includes: two first fixed seats (15), two second fixed seats (16), an internal thread rotating seat (18), an outer ring body (19), and a worm gear (21); the first fixed seats (15) and the second fixed seats (16) are both fixedly installed at the bottom of the intermediate disc body (3), and the first fixed seats (15) and the second fixed seats (16) are both provided with a rotary groove (20). The internal thread rotating seat (18) is a cylindrical structure, and the inner wall of the internal thread rotating seat (18) is provided with an internal thread. The outer ring body (19) and the worm gear (21) are fixedly sleeved on the outer wall of the internal thread rotating seat (18). The internal thread rotating seat (18) and the outer ring body (19) are connected to the rotary groove (20) with a clearance fit. The internal thread rotating seat (18) is threadedly connected to the threaded rod (10) through the internal thread.

4. The foldable trolley for transporting aluminum doors and windows according to claim 3, characterized in that: The second fixed seat (16) has a through hole (17), the diameter of the through hole (17) is larger than the diameter of the threaded rod (10), and the through hole (17) is a through hole type structure.

5. A foldable trolley for transporting aluminum doors and windows according to claim 3, characterized in that: The intermediate disk body (3) has an inner cavity (301) inside. A drive motor (11) is fixedly installed on the top cavity wall of the inner cavity (301). A connecting shaft is fixedly installed on the output shaft of the drive motor (11). The bottom end of the connecting shaft is rotatably installed with the bottom cavity wall of the inner cavity (301). A first cylindrical gear (12) is fixedly sleeved on the connecting shaft. The first cylindrical gear (12) is meshed with four second cylindrical gears (14). A rotating shaft (13) is fixedly installed in the middle of the second cylindrical gears (14). The rotating shaft (13) is rotatably installed inside the inner cavity (301).

6. A foldable trolley for transporting aluminum doors and windows according to claim 5, characterized in that: The bottom end of the rotating shaft (13) is fixedly connected to a worm (22), which meshes with the worm wheel (21). The top end of the worm (22) is rotatably installed with the bottom of the intermediate disk (3). The bottom of the intermediate disk (3) is also fixedly installed with a mounting bracket (23), the bottom of which is rotatably installed with the bottom end of the worm (22).

7. A foldable trolley for transporting aluminum doors and windows according to claim 1, characterized in that: The top edge of the intermediate disc (3) is provided with four notches (5), and a carrier bar (6) is hinged in the notch (5).

8. A foldable trolley for transporting aluminum doors and windows according to claim 7, characterized in that: The carrier strip (6) has end shafts (25) fixedly installed on both sides of one end near the notch (5). The end shafts (25) pass through the inlet hole (27) opened on the wall of the notch (5). The inlet hole (27) communicates with a circular cavity (26). The circular cavity (26) is opened into the interior of the intermediate disk (3). One end of the end shaft (25) is fixedly connected to a disk body (28). The disk body (28) is connected to the circular cavity (26). Multiple first magnetic blocks (31) are fixedly fitted on the disk surface of the disk body (28) near the inlet hole (27). The first magnetic blocks (31) are aligned with repulsive second magnetic blocks (32). The second magnetic blocks (32) are fixedly connected to the cavity wall of the circular cavity (26) near the inlet hole (27).

9. A foldable trolley for transporting aluminum doors and windows according to claim 8, characterized in that: A compression spring (29) is fixedly installed on the cavity wall at the end of the circular cavity (26) away from the inlet hole (27). A pressure plate (30) is fixedly connected to one end of the compression spring (29), and the pressure plate (30) presses against the disk surface of the circular disk body (28).

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