Double-spiral type automatic lifting trolley

Abstract

The invention relates to the related technical field of lifting platforms, in particular to a double-screw type automatic lifting trolley which comprises a base, two sets of lifting mechanisms are symmetrically arranged on the base, and the ends, away from the base, of the lifting mechanisms are connected with supporting plates; the supporting plate is driven by a large spiral structure fixedly installed on the base to ascend and descend. A bearing plate is fixedly installed on the supporting plate, a first overturning piece and a second overturning piece are symmetrically arranged along the side end of the bearing plate, and the first overturning piece and the second overturning piece are connected with the large spiral structure through a transmission piece arranged on the bearing plate; the supporting plate is lifted through a large spiral structure, large-stroke lifting of the supporting plate can be achieved even if a foundation pit is shallow, and when the supporting plate is lifted to the highest point of the stroke, the bearing plate can provide a larger contact area, so that the supporting plate is not prone to falling off, and the supporting plate is not prone to falling off when the supporting plate is lifted to the highest point of the stroke. Therefore, the stability of the lifting trolley is improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to lifting platforms, in particular to a double-screw automatic lifting trolley. Background Art

[0002] The application of hydraulic systems in scissor lifts can be traced back to the early needs of vertical transportation. The earliest hydraulic lifts used human, animal and water power to lift weights, and relied on these basic power methods until the Industrial Revolution. With the development of technology, hydraulic systems gradually replaced these traditional power methods because hydraulic systems have the characteristics of large driving force, small stroke but large thrust, which can effectively drive the scissor mechanism.

[0003] However, the existing scissor fork lifting mechanism power source hydraulic cylinder usually requires a large hydraulic station to supply oil, and the closing height cannot be too low due to the arrangement of the hydraulic cylinder. The lifting height is limited by the stroke of the hydraulic cylinder, resulting in a high closing height and a small stroke when the scissor fork lifting mechanism performs lifting work, resulting in reduced practical performance of the lifting trolley. Summary of the invention

[0004] The purpose of the present invention is to provide a double-screw automatic lifting trolley to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A double-screw automatic lifting trolley comprises a base, on which two sets of lifting mechanisms are symmetrically arranged, and one end of the lifting mechanism away from the base is connected to a supporting plate;

[0007] The support plate is driven to rise and fall by a large spiral structure fixedly mounted on the base;

[0008] A bearing plate is fixedly mounted on the support plate, and a first flip member and a second flip member are symmetrically arranged along the width and length directions of the bearing plate, respectively, and the first flip member and the second flip member are connected to the large spiral structure through a transmission member arranged on the bearing plate;

[0009] The first flip member includes a first flip plate and an extension member arranged at the bottom of the first flip plate. When the first flip plate performs a flipping operation, the extension member moves relative to the first flip plate. When the supporting plate is at the highest point of the stroke, the extension member is flush with the second flip member.

[0010] The double-screw automatic lifting trolley as described above: the lifting mechanism includes two groups of symmetrically arranged scissor-type structures, the scissor-type structures include a plurality of cross rods, and the plurality of cross rods are sequentially connected in a vertical direction to form a scissor-type connecting rod, one end of the scissor-type connecting rod is movably connected to the base, and the other end is movably connected to the support plate.

[0011] The double-screw automatic lifting trolley as described above: the large spiral structure includes a driving disk rotatably mounted on the base, the driving disk is provided with a spiral sheet arranged along the axial direction, the end of the spiral sheet away from the driving disk is fixed to the support plate, and the driving disk is also provided with a turbine, the turbine is rotatably connected to a vortex rod rotatably mounted on the base, and the vortex rod is driven to rotate by a motor fixedly mounted on the base.

[0012] The double-screw automatic lifting trolley as described above: the transmission part includes a first rotating shaft and a second rotating shaft symmetrically arranged along the width and length directions of the supporting plate, the first rotating shaft and the second rotating shaft are respectively arranged in the limiting grooves formed at the bottom of the supporting plate, the two ends of one of the first rotating shafts are rotatably connected with the two second rotating shafts through a symmetrically arranged fourth bevel gear set, and one of the first rotating shafts is connected to the driving disk through a linkage structure.

[0013] As described above, the double-screw automatic lifting trolley: the first flip plate is rotatably mounted in the width direction of the bearing plate via a first deflection shaft, and the first deflection shaft is rotatably connected to the first rotating shaft via a second gear set.

[0014] As described above, the double-screw automatic lifting trolley: the second flip member includes a second flip plate, the second flip plate is rotatably mounted on the length direction of the supporting plate through a second deflection shaft, and the second deflection shaft is rotatably connected to the second rotating shaft through a third gear set.

[0015] As described above, the double-screw automatic lifting trolley: the first flip plate is symmetrically provided with strip grooves at both ends along the length direction for the extension members to slide relative to each other.

[0016] The double-screw automatic lifting trolley as described above: the extension member comprises a bidirectional screw rod rotatably mounted on the second flip plate, and the bidirectional screw rod is rotatably connected to the first deflection shaft through a belt;

[0017] It also includes a telescopic plate, one end of which is slidably installed in the sliding groove, and a threaded sleeve threadedly connected to the bidirectional screw rod is arranged on the telescopic plate.

[0018] The double-screw automatic lifting trolley as described above: the linkage structure includes a rotating part rotatably installed on the base, the rotating part is rotatably connected to the driving disk through a first gear set, and the rotating part is also rotatably connected to a first connecting shaft rotatably arranged at the bottom of the support plate through a first bevel gear set, the first connecting shaft is rotatably connected to a second connecting shaft rotatably arranged at the side end of the support plate through a second bevel gear set, and the second connecting shaft is rotatably connected to one of the first rotating shafts through a third bevel gear set.

[0019] The double-screw automatic lifting trolley as described above: the rotating part includes a first transmission shaft and a second transmission shaft arranged along the same axis, one end of the first transmission shaft is rotatably installed on the base, one end of the second transmission shaft is rotatably connected to the support plate, and at least one set of connecting sleeves is arranged between the first transmission shaft and the second transmission shaft, one end of the connecting sleeve is slidably connected to the first transmission shaft, and the other end is slidably connected to the second transmission shaft.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The large spiral structure is used to realize the lifting of the pallet, so that even if the foundation pit is shallow, the pallet can be lifted with a large stroke. This means that when space is limited, the large spiral structure can still provide the lifting function required by the pallet, and when the pallet is raised to the highest point of the stroke, the load-bearing plate can provide a larger contact area, thereby increasing the stability of the lifting trolley. At the same time, increasing the load-bearing plate area can disperse the load to a larger area, reducing pressure concentration at a single point, so as to avoid damage or failure caused by excessive local pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a double-screw automatic lifting trolley.

[0023] Figure 2 It is a schematic diagram of the structure of the load-bearing plate, the first flip plate and the second flip plate in the double-screw automatic lifting trolley.

[0024] Figure 3 This is a schematic diagram of the structure of the large spiral structure in the double-spiral automatic lifting trolley.

[0025] Figure 4 It is a structural schematic diagram of the support plate and linkage structure in the double-screw automatic lifting trolley.

[0026] Figure 5 It is a schematic diagram of the structure of the load-bearing plate and transmission parts in the double-screw automatic lifting trolley.

[0027] Figure 6 It is a structural schematic diagram of the load-bearing plate and the second turning member in a double-screw automatic lifting trolley.

[0028] Figure 7 It is a structural schematic diagram of the load-bearing plate and the first turning member in a double-screw automatic lifting trolley.

[0029] Figure 8 It is a schematic diagram of the structure of the first flip plate and the extension part in the double-screw automatic lifting trolley.

[0030] Fig. 9 It is a structural schematic diagram of the support plate, base and lifting mechanism of the double-screw automatic lifting trolley.

[0031] In the figure: 1, base; 101, slide; 2, drive plate; 3, motor; 4, worm rod; 5, turbine; 6, spiral plate; 7, first gear set; 8, first transmission shaft; 801, first limit slider; 9, connecting sleeve; 901, second limit slider; 10, second transmission shaft; 11, support plate; 12, bearing plate; 1201, limit groove; 13, first bevel gear set; 14, first connecting shaft; 15, second bevel gear set; 16, second connecting shaft ; 17. The third bevel gear set; 18. The first rotating shaft; 19. The fourth bevel gear set; 20. The second rotating shaft; 21. The first deflection shaft; 22. The second gear set; 23. The second deflection shaft; 24. The third gear set; 25. The first flip plate; 2501. The strip groove; 26. The second flip plate; 27. The bidirectional screw; 28. The belt; 29. ​​The telescopic plate; 2901. The threaded sleeve; 30. The first connecting rod; 31. The second connecting rod; 32. The articulated shaft. DETAILED DESCRIPTION

[0032] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0033] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0034] In addition, in order to better illustrate the present application, numerous specific details are provided in the specific embodiments below. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, and elements well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0035] See also Figures 1 to 9 In the present invention, a double-screw automatic lifting trolley includes a base 1, a support plate 11, a bearing plate 12, a first flip plate 25, a lifting mechanism, a large spiral structure, a first flip member, a second flip member and an extension member.

[0036] For details, please refer to Figure 1 , Figure 3 , Figure 7 and Figure 8 ,include;

[0037] A base 1, on which two sets of lifting mechanisms are symmetrically arranged, and one end of the lifting mechanism away from the base 1 is connected to a support plate 11;

[0038] The support plate 11 is driven to rise and fall by a large spiral structure fixedly mounted on the base 1;

[0039] A carrying plate 12 is fixedly mounted on the support plate 11, and a first flipping member and a second flipping member are symmetrically arranged along the width and length directions of the carrying plate 12, respectively, and the first flipping member and the second flipping member are connected to the large spiral structure through a transmission member arranged on the carrying plate 12;

[0040] The first flip member includes a first flip plate 25 and an extension member arranged at the bottom of the first flip plate 25. When the first flip plate 25 performs a flipping operation, the extension member moves relative to the first flip plate 25. When the supporting plate 12 is at the highest point of the stroke, the extension member is flush with the second flip member.

[0041] In detail, in this embodiment, the double-screw automatic lifting trolley described in the present invention is adopted. When in use, the large spiral structure is controlled to work to drive the support plate 11 to be lifted and lowered in the vertical direction. During the lifting process of the support plate 11, the supporting plate 12 drives the first flip member and the second flip member to be lifted and lowered synchronously. Under the action of the transmission member, the first flip member and the second flip member rotate relative to the supporting plate 12, so that when the position of the support plate 11 rises from the lowest point to the highest point of the stroke, the first flip member and the second flip member and the supporting plate 12 are changed from being perpendicular to each other to being parallel to each other, and when the first flip member is deflected, the two extension members move simultaneously along the length direction of the first flip member, and the moving directions always remain opposite, so that when the first flip member and the second flip member are completely flipped to be parallel to the supporting plate 12, the end of the extension member away from the first flip member is flush with the edge of the second flip member.

[0042] Since the large spiral structure has lower requirements for civil engineering foundation pits, the large stroke lifting of the pallet 11 can be achieved even if the foundation pit is shallow. This means that in the case of limited space, the large spiral structure can still provide the lifting function required by the pallet 11, and when the pallet 11 is raised to the highest point of the stroke, the load-bearing plate 12 can provide a larger contact area, thereby increasing the stability of the lifting trolley. At the same time, increasing the area of ​​the load-bearing plate 12 can disperse the load to a larger area, reducing pressure concentration at a single point, so as to avoid damage or failure caused by excessive local pressure.

[0043] As a further solution of the present invention, please refer to Fig. 9 The lifting mechanism includes two groups of symmetrically arranged scissor structures, and the scissor structures include multiple cross rods. The multiple cross rods are connected in sequence along the vertical direction to form a scissor-type connecting rod. One end of the scissor-type connecting rod is movably connected to the base 1, and the other end is movably connected to the support plate 11.

[0044] It should be noted that the cross rod is composed of a first connecting rod 30 and a second connecting rod 31, wherein one end of the first connecting rod 30 or the second connecting rod 31 close to the base 1 or the support plate 11 is rotatably installed with a hinge shaft 32, and the hinge shaft 32 is inserted into the side panel of the base 1. Specifically, a slide groove 101 is formed on the side panel, and the hinge shaft 32 is inserted into the slide groove 101, and the bottom of the support plate 11 is also provided with a slide groove consistent with the slide groove 101 and for the hinge shaft 32 to slide.

[0045] When the large spiral structure drives the pallet 11 to rise or fall, it can drive the first connecting rod 30 and the second connecting rod 31 to approach the base 1 or one end of the pallet 11 to move closer to or farther away from each other, wherein, while ensuring that the closure degree of the scissor-type connecting rod structure is low, the use of the scissor-type connecting rod mechanism can enable the pallet 11 to maintain a high stability when lifting, while providing a wide working platform and a high load-bearing capacity, which makes the high-altitude working range larger and suitable for multiple people to work at the same time.

[0046] As a further solution of the present invention, please refer to Figure 2 and Figure 3 The large spiral structure includes a driving disk 2 rotatably mounted on the base 1, and a spiral sheet 6 arranged axially is provided on the driving disk 2. The end of the spiral sheet 6 away from the driving disk 2 is fixed to the support plate 11, and a turbine 5 is also provided on the driving disk 2. The turbine 5 is rotatably connected to a vortex rod 4 rotatably mounted on the base 1, and the vortex rod 4 is driven to rotate by a motor 3 fixedly mounted on the base 1.

[0047] It should be noted that the large spiral structure transmission is similar to the screw nut pair transmission, the raised spiral piece 6 looks like a transmission screw, and the bottom drive plate 2 is similar to a nut. The nut part is designed with a sprocket or worm gear input, and the rotation of the nut can be achieved through external input torque. The large spiral structure in the present invention belongs to the prior art and will not be redundantly described in this embodiment.

[0048] As a further solution of the present invention, please refer to Figure 4 and Figure 5The transmission member includes a first rotating shaft 18 and a second rotating shaft 20 which are symmetrically arranged along the width and length directions of the supporting plate 12. The first rotating shaft 18 and the second rotating shaft 20 are respectively arranged in the limiting groove 1201 formed at the bottom of the supporting plate 12. The two ends of one of the first rotating shafts 18 are respectively rotatably connected with the two second rotating shafts 20 through a symmetrically arranged fourth bevel gear set 19, and one of the first rotating shafts 18 is connected to the driving disk 2 through a linkage structure.

[0049] It should be noted that: one of the second rotating shafts 20 is rotatably connected to the other first rotating shaft 18 through the fifth bevel gear set, so that no matter which of the first rotating shaft 18 and the second rotating shaft 20 rotates, under the cooperation of several sets of bevel gear sets, the first rotating shaft 18 and the second rotating shaft 20 can be rotated synchronously to ensure that the first flip member and the second flip member flip at the same time, to ensure that when the supporting plate 12 is raised to the highest point, under the cooperation of the first flip member, the second flip member and the extension member, the supporting plate 12 expands the contact area equidistantly to the surrounding areas, and at the same time, it can avoid the occurrence of gaps on the supporting plate 12 due to the expansion, thereby ensuring the overall stability of the supporting plate 12.

[0050] As a further solution of the present invention, please refer to the figure, the first flip plate 25 is rotatably installed in the width direction of the supporting plate 12 through the first deflection shaft 21, and the first deflection shaft 21 is rotatably connected to the first rotating shaft 18 through the second gear set 22.

[0051] The second flip member includes a second flip plate 26 , which is rotatably mounted in the length direction of the supporting plate 12 via a second deflection shaft 23 , and the second deflection shaft 23 is rotatably connected to the second rotating shaft 20 via a third gear set 24 .

[0052] The first flip plate 25 has symmetrically formed strip grooves 2501 at both ends along the length direction for the extension member to slide relative to each other.

[0053] The extension member includes a bidirectional screw rod 27 rotatably mounted on the second flip plate 26, and the bidirectional screw rod 27 is rotatably connected to the first deflection shaft 21 through a belt 28;

[0054] It also includes a telescopic plate 29 , one end of which is slidably installed in the strip groove 2501 , and a threaded sleeve 2901 threadedly connected to the bidirectional screw rod 27 is provided on the telescopic plate 29 .

[0055] To elaborate, when the support plate 11 is driven by the large spiral structure to perform a lifting action, it drives the supporting plate 12 to move synchronously. At this time, the first deflection axis 21 and the second deflection axis 23 rotate synchronously with the first rotating shaft 18 and the second rotating shaft 20 through the second gear set 22 and the third gear set 24 respectively, so that the first deflection axis 21 and the second deflection axis 23 rotate at the same time, driving the first flip plate 25 and the second flip plate 26 to rotate accordingly, and the flip angle of the first flip plate 25 and the second flip plate 26 is 90°, so as to ensure that when the supporting plate 12 is raised to the highest point of the stroke, the first flip plate 25 and the second flip plate 26 are parallel to and in surface contact with the supporting plate 12.

[0056] Among them, during the deflection of the first flip plate 25, under the transmission action of the belt 28, the bidirectional screw 27 is driven to rotate, and when the bidirectional screw 27 rotates, it drives the two threaded sleeves 2901 to move along the axial direction of the bidirectional screw 27, and the movement directions of the two threaded sleeves 2901 always remain opposite, so that the telescopic plate 29 moves along the length direction of the first flip plate 25. When the first flip plate 25 is flipped to be parallel to the supporting plate 12, the end of the telescopic plate 29 away from the first flip plate 25 is flush with the second flip plate 26, and the telescopic plate 29 also maintains surface contact with the side of the supporting plate 12, so as to increase the contact area on the supporting plate 12 while preventing the appearance of gaps on the supporting plate 12, which can further improve the bearing capacity and stability of the supporting plate 12.

[0057] It should be noted that: to ensure the flipping angle of the first flip plate 25 and the second flip plate 26, by controlling the transmission ratio of the first gear set 7, the flipping angle of the first flip plate 25 and the second flip plate 26 is 90°, and the moving distance of the telescopic plate 29 can be adjusted by controlling the pitch of the bidirectional screw rod 27.

[0058] As a further solution of the present invention, please refer to Figure 3 The linkage structure includes a rotating member rotatably mounted on the base 1, the rotating member is rotatably connected to the driving disk 2 through a first gear set 7, and the rotating member is also rotatably connected to a first connecting shaft 14 rotatably arranged at the bottom of the support plate 11 through a first bevel gear set 13, the first connecting shaft 14 is rotatably connected to a second connecting shaft 16 rotatably arranged at the side end of the support plate 11 through a second bevel gear set 15, and the second connecting shaft 16 is rotatably connected to one of the first rotating shafts 18 through a third bevel gear set 17.

[0059] The rotating member includes a first transmission shaft 8 and a second transmission shaft 10 arranged along the same axis, one end of the first transmission shaft 8 is rotatably installed on the base 1, one end of the second transmission shaft 10 is rotatably connected to the support plate 11, and at least one set of connecting sleeves 9 is arranged between the first transmission shaft 8 and the second transmission shaft 10, one end of the connecting sleeve 9 is slidably connected to the first transmission shaft 8, and the other end is slidably connected to the second transmission shaft 10.

[0060] Specifically, when the driving disk 2 rotates, the rotating member is driven to rotate under the action of the first gear set 7, wherein the rotating member realizes the transmission work of the support plate 11 during large stroke lifting and lowering through the first transmission shaft 8, the second transmission shaft 10 and at least one set of connecting sleeves 9 arranged between the first transmission shaft 8.

[0061] Preferably, at least one group of first limit sliders 801 are provided on the first transmission shaft 8, and a first limit slide groove slidably matched with the first limit slider 801 is formed on the inner wall of the connecting sleeve 9, and at least one group of second limit sliders 901 are provided on the outer wall of the connecting sleeve 9, and a second limit slide groove slidably matched with the second limit slider 901 is formed on the inner wall of the second transmission shaft 10. Under the limiting action of the first limit slider 801 and the first limit slide groove and the second limit slider 901 and the second limit slide groove, a sliding connection between the first transmission shaft 8, the second transmission shaft 10 and the connecting sleeve 9 is realized without affecting the rotation of the first transmission shaft 8 to drive the rotation of the connecting sleeve 9 and the second transmission shaft 10.

[0062] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0063] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A double-screw automatic lifting trolley, comprising a base (1), two sets of lifting mechanisms are symmetrically arranged on the base (1), and a support plate (11) is connected to one end of the lifting mechanism away from the base (1), characterized in that: The support plate (11) is driven to rise and fall by a large spiral structure fixedly mounted on the base (1); A bearing plate (12) is fixedly mounted on the support plate (11), and a first flipping member and a second flipping member are symmetrically arranged along the width and length directions of the bearing plate (12), respectively, and the first flipping member and the second flipping member are connected to the large spiral structure via a transmission member arranged on the bearing plate (12); The first flip member comprises a first flip plate (25) and an extension member arranged at the bottom of the first flip plate (25); when the first flip plate (25) performs a flipping operation, the extension member moves relative to the first flip plate (25); when the supporting plate (12) is at the highest point of the stroke, the extension member is flush with the second flip member.

2. A double-screw automatic lifting trolley according to claim 1, characterized in that: The lifting mechanism comprises two groups of symmetrically arranged scissor-type structures, wherein the scissor-type structures comprise a plurality of cross rods, wherein the plurality of cross rods are sequentially connected in a vertical direction to form a scissor-type connecting rod, wherein one end of the scissor-type connecting rod is movably connected to the base (1), and the other end is movably connected to the support plate (11).

3. The double-screw automatic lifting trolley according to claim 1, characterized in that: The large spiral structure comprises a driving disc (2) rotatably mounted on the base (1), the driving disc (2) being provided with a spiral sheet (6) arranged in an axial direction, the spiral sheet (6) being fixed to the support plate (11) at one end away from the driving disc (2), and the driving disc (2) being further provided with a turbine (5), the turbine (5) being rotatably connected to a worm rod (4) rotatably mounted on the base (1), the worm rod (4) being driven to rotate by a motor (3) fixedly mounted on the base (1).

4. A double-screw automatic lifting trolley according to claim 3, characterized in that: The transmission member comprises a first rotating shaft (18) and a second rotating shaft (20) which are symmetrically arranged along the width and length directions of the supporting plate (12); the first rotating shaft (18) and the second rotating shaft (20) are respectively arranged in a limiting groove (1201) formed at the bottom of the supporting plate (12); the two ends of one of the first rotating shafts (18) are rotationally connected to the two second rotating shafts (20) via a symmetrically arranged fourth bevel gear set (19); and one of the first rotating shafts (18) is connected to the driving disk (2) via a linkage structure.

5. The double-screw automatic lifting trolley according to claim 4, characterized in that: The first flip plate (25) is rotatably mounted in the width direction of the supporting plate (12) via a first deflection shaft (21), and the first deflection shaft (21) is rotatably connected to the first rotating shaft (18) via a second gear set (22).

6. A double-screw automatic lifting trolley according to claim 5, characterized in that: The second flip member comprises a second flip plate (26), the second flip plate (26) being rotatably mounted in the length direction of the supporting plate (12) via a second deflection shaft (23), and the second deflection shaft (23) being rotatably connected to the second rotating shaft (20) via a third gear set (24).

7. The double-screw automatic lifting trolley according to claim 6, characterized in that: The first flip plate (25) is symmetrically provided with strip grooves (2501) at both ends along the length direction for the extension member to slide relative to each other.

8. The double-screw automatic lifting trolley according to claim 7, characterized in that: The extension member comprises a bidirectional screw rod (27) rotatably mounted on the second flip plate (26), and the bidirectional screw rod (27) is rotatably connected to the first deflection shaft (21) via a belt (28); It also includes a telescopic plate (29), one end of which is slidably mounted in the strip groove (2501), and a threaded sleeve (2901) threadedly connected to the bidirectional screw rod (27) is provided on the telescopic plate (29).

9. The double-screw automatic lifting trolley according to claim 4, characterized in that: The linkage structure comprises a rotating member rotatably mounted on the base (1), the rotating member being rotatably connected to the driving disk (2) via a first gear set (7), and the rotating member being rotatably connected to a first connecting shaft (14) rotatably arranged at the bottom of the support plate (11) via a first bevel gear set (13), the first connecting shaft (14) being rotatably connected to a second connecting shaft (16) rotatably arranged at a side end of the support plate (11) via a second bevel gear set (15), and the second connecting shaft (16) being rotatably connected to one of the first rotating shafts (18) via a third bevel gear set (17).

10. The double-screw automatic lifting trolley according to claim 9, characterized in that: The rotating member comprises a first transmission shaft (8) and a second transmission shaft (10) arranged along the same axis, one end of the first transmission shaft (8) is rotatably mounted on the base (1), one end of the second transmission shaft (10) is rotatably connected to the support plate (11), at least one set of connecting sleeves (9) is arranged between the first transmission shaft (8) and the second transmission shaft (10), one end of the connecting sleeve (9) is slidably connected to the first transmission shaft (8), and the other end of the connecting sleeve (9) is slidably connected to the second transmission shaft (10).

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