Spiral lifting device for scissor fork

Abstract

The utility model relates to a lifting device, in particular to a spiral lifting device for a scissor fork, which comprises a lower supporting plate and a scissor fork frame arranged between the lower supporting plate and an upper supporting plate and used for adjusting the distance between the lower supporting plate and the upper supporting plate, a large spiral jacking mechanism is further arranged between the lower supporting plate and the upper supporting plate, and an expansion structure is arranged on the upper supporting plate. The placing plate is arranged on the top plate, the first extension plate and the second extension plate are arranged between the top plate and the placing plate, the top plate is connected with the first extension plate and the second extension plate through the linkage mechanism, and the first extension plate and the second extension plate can be close to each other or away from each other through rotation adjustment of the top plate. When the first extension plate and the second extension plate are far away from each other, the combined area of the top plate, the first extension plate and the second extension plate is increased, the placing or bearing area can be increased, and otherwise, the placing or bearing area is reduced, the overall space is reduced, and the folding type folding chair can be stored and used in a narrow environment.

Description

Technical Field

[0001] The utility model relates to a lifting device, in particular to a spiral lifting device for a scissors fork. Background Art

[0002] The scissor lift is a mechanical device that is mainly used for lifting and transporting objects by adjusting the height. Its scissor mechanical structure enables the lifting platform to have higher stability, a wide working platform and a higher load-bearing capacity. The spiral lift for scissors fork has a unique design and superior performance. It can achieve precise height adjustment to meet different needs and plays an important role in multiple industries.

[0003] When the current spiral lifting device for scissors forks is in use, the load-bearing placement area of ​​the upper tray on the top is generally fixed. The area of ​​the upper tray determines the amount of items it can place and affects the stability of the goods when supporting. Although a larger upper tray area can increase the placement or load-bearing area, it also increases the overall volume of the spiral lifting device for scissors forks, making it inconvenient to use the spiral lifting device for scissors forks in different usage environments. Utility Model Content

[0004] The purpose of the utility model is to provide a spiral lifting device for scissors forks to solve the problems raised in the above background technology.

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

[0006] A spiral lifting device for a scissor fork, comprising a lower support plate and an upper support plate vertically arranged above the lower support plate, wherein the lower support plate and the upper support plate are connected by a scissor frame, a large spiral lifting mechanism is further arranged between the lower support plate and the upper support plate, and an expansion structure is provided on the upper support plate, wherein the expansion structure comprises a top plate and a rotatably adjustable placement plate arranged above the top plate;

[0007] The top plate is fixed to the upper supporting plate, and a first extension plate and a second extension plate are respectively provided on both sides of the width direction between the top plate and the placement plate, the first extension plate and the second extension plate are slidably connected to the top plate, and a linkage mechanism is provided on the top plate;

[0008] The placement plate is used to drive the linkage mechanism to move during rotation adjustment. When the linkage mechanism moves, it is used to make the distance between the first extension plate and the second extension plate closer or farther away. After the distance between the first extension plate and the second extension plate is farther away, the placement plate is embedded in the distance between the first extension plate and the second extension plate and maintains the top surface flush with both of them.

[0009] The spiral lifting device for scissors fork as described above: a plurality of limiting sliding grooves are provided on the top plate, two movable grooves are symmetrically provided at the center of the top plate, and a rotating notch is provided at the center of the top plate between the two movable grooves;

[0010] The two sides of the rotating groove are connected to the movable groove, and a first plug hole is formed on the top plate at the center of the rotating groove;

[0011] The limiting sliding groove, the movable groove, the rotating notch and the first plug hole are all cooperatively connected with the linkage mechanism.

[0012] The spiral lifting device for scissors fork as described above: the linkage mechanism includes a driving gear, a first rack and a second rack respectively engaged with both sides of the driving gear, and a second plug hole is formed through the center of the driving gear;

[0013] The driving gear is rotatably connected to the rotating slot, and the second plug hole is adapted to correspond to the first plug hole;

[0014] The first rack and the second rack are slidably connected in the two movable grooves respectively.

[0015] The spiral lifting device for scissors forks as described above: handles are fixedly connected to both ends of the placement plate in the longitudinal direction, and a plug-in prism is integrally formed at the center of the bottom of the placement plate;

[0016] The plug-in prism is slidably plugged into the second plug-in hole and the first plug-in hole.

[0017] The spiral lifting device for scissors fork as described above: two first convex plates are fixedly connected to the first extension plate, and two second convex plates are fixedly connected to the second extension plate;

[0018] The first convex plate and the second convex plate are arranged in a convex shape.

[0019] As described above, the spiral lifting device for scissors forks: the plurality of limiting slide grooves are arranged in a convex shape, the limiting slide grooves are slidingly connected to the first convex plate and the second convex plate, and the first convex plate and the second convex plate are alternately staggered in the plurality of limiting slide grooves.

[0020] The spiral lifting device for scissors fork as described above: the first rack and the second rack are respectively slidably connected in the two movable grooves.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] By arranging a placement plate on the top plate, and arranging a first extension plate and a second extension plate between the top plate and the placement plate, the top plate is connected to the first extension plate and the second extension plate through a linkage mechanism, and the first extension plate and the second extension plate can be made closer to or farther away from each other by rotating and adjusting the top plate. When the first extension plate and the second extension plate are farther away from each other, the top plate can be embedded in the gap between the first extension plate and the second extension plate, and the top is kept flush with the two. At this time, the combined area of ​​the top plate, the first extension plate and the second extension plate is increased, which can increase the placement or supporting area. Otherwise, the placement or supporting area is reduced, reducing the overall space, and it can be stored and used in a narrow environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of a spiral lifting device for scissors fork.

[0024] Figure 2 This is a schematic diagram of the structure of the spiral lifting device for scissors forks when the extension structure is unfolded.

[0025] Figure 3 This is a schematic diagram of the overall structure of the spiral lifting device in the spiral lifting device for scissors fork.

[0026] Figure 4 This is a schematic diagram of the structure of the extended structure in the spiral lifting device for scissors forks.

[0027] Figure 5 This is a schematic diagram of the structure of the top plate in the spiral lifting device for scissors fork.

[0028] Figure 6 This is a schematic diagram of the structure of the linkage mechanism in the spiral lifting device for scissors fork.

[0029] Figure 7 This is a schematic diagram of the structure of the driving gear in the spiral lifting device for scissors fork.

[0030] Figure 8 This is a schematic diagram of the structure for placing a plate in a spiral lifting device for a scissors fork.

[0031] Figure 9 This is a schematic diagram of the structure of the scissors fork when the spiral lifting device is expanded.

[0032] Figure 10 This is a schematic diagram of the structure of the spiral lifting device for scissors fork during contraction.

[0033] Figure 11 This is a schematic diagram of the structure of the spiral lifting device for scissors forks when the plate is placed in preparation for rotation.

[0034] In the figure: 1. Lower support plate; 2. Scissor frame; 3. Large spiral jacking mechanism; 4. Upper support plate; 5. Top plate; 6. Placement plate; 7. First extension plate; 8. Second extension plate; 9. Limiting slide; 10. Movable slot; 11. Rotation slot; 12. First plug-in hole; 13. Drive gear; 14. Second plug-in hole; 15. First convex plate; 16. First rack; 17. Second convex plate; 18. Second rack; 19. Handle; 20. Plug-in prism. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] See also Figures 1-11 In an embodiment of the utility model, a spiral lifting device for a scissors fork includes a lower support plate and an upper support plate vertically arranged above the lower support plate, the lower support plate and the upper support plate are connected by a scissors fork frame, a large spiral lifting mechanism is further arranged between the lower support plate and the upper support plate, an expansion structure is provided on the upper support plate, and the expansion structure includes a top plate and a rotatable and adjustable placement plate arranged above the top plate;

[0037] The top plate is fixed to the upper supporting plate, and a first extension plate and a second extension plate are respectively provided on both sides of the width direction between the top plate and the placement plate, the first extension plate and the second extension plate are slidably connected to the top plate, and a linkage mechanism is provided on the top plate;

[0038] The placement plate is used to drive the linkage mechanism to move during rotation adjustment. When the linkage mechanism moves, it is used to make the distance between the first extension plate and the second extension plate closer or farther away. After the distance between the first extension plate and the second extension plate is farther away, the placement plate is embedded in the distance between the first extension plate and the second extension plate and maintains the top surface flush with both of them.

[0039] In this embodiment, the input shaft of the large spiral jacking mechanism 3 is coaxially fixed with the output shaft of the motor installed on the lower support plate 1. The large spiral jacking mechanism 3 is driven by the motor to operate. The large spiral jacking mechanism 3 acts between the lower support plate 1 and the upper support plate 4. When it moves, the lower support plate 1 and the upper support plate 4 are moved closer to or away from each other. It should be noted that since the scissor frame 2 is connected between the lower support plate 1 and the upper support plate 4, the lower support plate 1 and the upper support plate 4 connected by the large spiral jacking mechanism 3 can only move away from or closer to each other, and cannot deviate from or rotate relative to each other.

[0040] The large screw lifting mechanism 3 is a known technology. Its principle is as follows: the large screw transmission is similar to a screw-nut pair transmission. When raised, the large screw resembles a drive screw, and the mechanism at the bottom resembles a nut. A sprocket or worm gear input is designed into the nut. Externally input torque is used to rotate the nut, splitting the screw into horizontal and vertical segments. The horizontal segments resemble the threads of the screw, while the vertical segments resemble the inner diameter of the screw. The mechanism at the bottom can be rotated to assemble the horizontal and vertical segments into a screw or split the screw into sheets for storage. The distance between the two transverse pieces is the pitch of the large spiral. When the sprocket of the large spiral rotates one circle, the large spiral rises or falls one pitch. 1. The large spiral mechanism has a compact structure and relatively low requirements for civil engineering foundation pits. Shallow foundation pits can achieve large-stroke lifting; 2. The large spiral mechanism is relatively convenient to arrange and can be flexibly arranged according to the shape of the lifting platform. It is generally used for lifting platforms with irregular surfaces such as orchestra pits; 3. Since the large spiral is composed of thin sheets, the internal structure is relatively simple, its weight is very light, and it is very convenient to disassemble and maintain; 4. The connection between the large spiral and the base is a tapered sliding bearing, and the large spiral is allowed to have a certain inclination during installation, generally not exceeding 1 degree; 5. The large spiral has a certain reduction ratio, which can reduce the reducer of the drive mechanism. The large spiral jacking mechanism 3 replaces the traditional large-volume hydraulic cylinder of the hydraulic station in the application of the spiral lifting device for scissors fork. The closing height of the scissors will be much lower than that of the scissors using the hydraulic cylinder, and the stroke of the large spiral will be much larger than that of the hydraulic cylinder.

[0041] When the placement or supporting area of ​​the placement plate 6 needs to be expanded, the placement plate 6 is manually lifted up and rotated 180 degrees, and the driving linkage mechanism set on the top plate 5 can move. The linkage mechanism is connected with the first extension plate 7 and the second extension plate 8, and can make the first extension plate 7 and the second extension plate 8 move closer to or away from each other during movement. After the first extension plate 7 and the second extension plate 8 move closer to each other, the bottom of the placement plate 6 is attached to the top surface of the first extension plate 7 and the second extension plate 8, and the first extension plate 7 and the second extension plate 8 are between the top plate 5 and the placement plate 6, and the first extension plate 7 and the side edges of the second extension plate 8 are kept flush with the top plate 5 and the placement plate 6. At this time, the overall top area of ​​the spiral lifting device for scissors forks is smaller, reducing the overall volume. When the first extension plate 7 and the second extension plate 8 are moved away from each other, the bottom of the placement plate 6 is attached to the top surface of the top plate 5 and the placement plate 6 is embedded in the gap between the first extension plate 7 and the second extension plate 8. The two side edges of the placement plate 6 are respectively in conflict with the first extension plate 7 and the second extension plate 8. At this time, through the combination of the placement plate 6, the first extension plate 7 and the second extension plate 8, the combined area is increased, and the placement or supporting space is improved.

[0042] As a further scheme of the utility model, a plurality of limiting sliding grooves 9 are formed on the top plate 5, two movable grooves 10 are symmetrically arranged at the central part of the top plate 5, and a rotating missing groove 11 is formed at the central part of the top plate 5 between the two movable grooves 10;

[0043] The two sides of the rotating missing groove 11 are throughly arranged with the movable grooves 10, and a first plug-in hole 12 is throughly formed on the top plate 5 at the central part of the rotating missing groove 11;

[0044] The limiting sliding groove 9, the movable groove 10, the rotating missing groove 11 and the first plug-in hole 12 are all connected with the linkage mechanism.

[0045] In this embodiment, the linkage mechanism can be limited to slide and adjust on the horizontal plane through the limiting sliding groove 9, the linkage mechanism can be kept driving connection through the through arrangement of the two sides of the rotating missing groove 11 and the movable groove 10, the driving use demand is met, and the setting of the top plate 5 meets the overall connection use of the expansion structure.

[0046] As a further scheme of the utility model, the linkage mechanism comprises a driving gear 13, a first rack 16 and a second rack 18 respectively engaged on the two sides of the driving gear 13, and a second plug-in hole 14 is throughly formed at the central part of the driving gear 13;

[0047] The driving gear 13 is rotationally connected in the rotating missing groove 11, and the second plug-in hole 14 is correspondingly adapted with the first plug-in hole 12.

[0048] The first rack 16 and the second rack 18 are respectively slidably connected in the two movable grooves 10.

[0049] In this embodiment, the driving gear 13 is rotationally adjusted and used, the first rack 16 and the second rack 18 engaged with the driving gear 13 on the two sides can be oppositely slidably adjusted in the two movable grooves 10, the expansion structure is expanded and contracted and adjusted and used, the second plug-in hole 14 is matched with the first plug-in hole 12, the placing plate 6 can be limited in use after rotation, and the adjustment and use effect is ensured.

[0050] As a further scheme of the utility model, the length direction both ends of the placing plate 6 are fixedly connected with handles 19, and an insertion prism 20 is integrally formed at the bottom central part of the placing plate 6;

[0051] The insertion prism 20 is slidably and plug-inly arranged with the second plug-in hole 14 and the first plug-in hole 12.

[0052] In this embodiment, the handle 19 is used for manually rotating the placing plate 6, and is gripped during lifting and rotating the placing plate 6, and the rotation condition of the placing plate 6 can be adjusted and controlled through the insertion and fitting of the insertion prismatic column 20 in the second insertion hole 14 and the first insertion hole 12, when the placing plate 6 needs to be rotated and adjusted, the placing plate 6 needs to be lifted, the insertion prismatic column 20 is separated from the insertion and fitting of the first insertion hole 12, at this time, the placing plate 6 can be rotated, when the placing plate 6 is kept fixed and limited, the insertion prismatic column 20 is inserted in the first insertion hole 12, at this time, the placing plate 6 loses the rotation condition.

[0053] As a further scheme of the utility model, the first extension plate 7 is fixedly connected with two first convex plates 15, and the second extension plate 8 is fixedly connected with two second convex plates 17.

[0054] The first convex plate 15 and the second convex plate 17 are arranged in a convex shape.

[0055] In this embodiment, the first convex plate 15 and the second convex plate 17 arranged on the first extension plate 7 and the second extension plate 8 are used to make the first extension plate 7 and the second extension plate 8 keep sliding connection on the top plate 5, and meet the movement connection requirement during adjustment.

[0056] As a further scheme of the utility model, a plurality of limiting sliding grooves 9 are arranged in a convex shape, the limiting sliding grooves 9 are slidingly connected with the first convex plate 15 and the second convex plate 17, and the first convex plate 15 and the second convex plate 17 are alternately and staggeredly arranged in the plurality of limiting sliding grooves 9.

[0057] In this embodiment, the first convex plate 15 and the second convex plate 17 on both sides are alternately and staggeredly arranged in the plurality of limiting sliding grooves 9, so that when the first extension plate 7 and the second extension plate 8 connected with the first convex plate 15 and the second convex plate 17 are close to or away from each other, the movement of the first convex plate 15 and the second convex plate 17 on the limiting sliding groove 9 does not affect the movement adjustment of the two, and the connection use effect is ensured.

[0058] As a further scheme of the utility model, the first rack 16 and the second rack 18 are slidingly connected in the two movable grooves 10 respectively.

[0059] In this embodiment, the first rack 16 and the second rack 18 are symmetrically slidably connected in the movable groove 10, and the movable groove 10 is connected through both sides of the rotating groove 11. The driving gear 13 rotatably arranged inside the rotating groove 11 can engage with the first rack 16 and the second rack 18 through the through-portion of the movable groove 10 and the rotating groove 11, thereby satisfying the drive connection. The driving gear 13 is rotatably arranged in the rotating groove 11, which can limit the up and down displacement of the driving gear 13. Therefore, when the placement plate 6 is lifted or lowered for adjustment, the driving gear 13 maintains an unchanged height position.

[0060] The above embodiments are exemplary rather than restrictive, so any technical solution of the present invention that can be implemented in other specific forms without departing from the spirit or basic features of the present invention is included in the present invention.

Claims

1. A spiral lifting device for a scissor fork, comprising a lower support plate (1) and an upper support plate (4) vertically arranged above the lower support plate (1), wherein the lower support plate (1) and the upper support plate (4) are connected by a scissor fork frame (2), characterized in that: A large spiral lifting mechanism (3) is further provided between the lower supporting plate (1) and the upper supporting plate (4); an expansion structure is provided on the upper supporting plate (4); the expansion structure comprises a top plate (5) and a placement plate (6) which is arranged above the top plate (5) and can be rotated and adjusted; The top plate (5) is fixed on the upper supporting plate (4); a first extension plate (7) and a second extension plate (8) are respectively provided on both sides of the width direction between the top plate (5) and the placement plate (6); the first extension plate (7) and the second extension plate (8) are slidably connected to the top plate (5); and a linkage mechanism is provided on the top plate (5); The placement plate (6) is used to drive the linkage mechanism to move during rotation adjustment. When the linkage mechanism moves, it is used to make the distance between the first extension plate (7) and the second extension plate (8) closer or farther away. After the distance between the first extension plate (7) and the second extension plate (8) is farther away, the placement plate (6) is embedded in the distance between the first extension plate (7) and the second extension plate (8) and maintains a top surface flush with the two.

2. A spiral lifting device for scissors fork according to claim 1, characterized in that: A plurality of limiting sliding grooves (9) are provided on the top plate (5), two movable grooves (10) are symmetrically provided at the center of the top plate (5), and a rotation slot (11) is provided at the center of the top plate (5) between the two movable grooves (10); The two sides of the rotating groove (11) are connected to the movable groove (10), and a first plug hole (12) is provided on the top plate (5) at the center of the rotating groove (11); The limiting sliding groove (9), the movable groove (10), the rotating notch (11) and the first plug hole (12) are all connected in cooperation with the linkage mechanism.

3. A spiral lifting device for scissors fork according to claim 2, characterized in that: The linkage mechanism includes a driving gear (13), a first rack (16) and a second rack (18) respectively meshed with both sides of the driving gear (13), and a second plug hole (14) is provided through the center of the driving gear (13); The driving gear (13) is rotatably connected in the rotating slot (11), and the second plug hole (14) is adapted to correspond to the first plug hole (12); The first rack (16) and the second rack (18) are respectively slidably connected in the two movable grooves (10).

4. The spiral lifting device for scissors fork according to claim 1, characterized in that: Both ends of the placement plate (6) in the longitudinal direction are fixedly connected with handles (19), and a plug-in prism (20) is integrally formed at the center of the bottom of the placement plate (6); The plug-in prism (20) is slidably plugged into the second plug-in hole (14) and the first plug-in hole (12).

5. The spiral lifting device for scissors fork according to claim 1, characterized in that: Two first convex plates (15) are fixedly connected to the first extension plate (7), and two second convex plates (17) are fixedly connected to the second extension plate (8); The first convex plate (15) and the second convex plate (17) are arranged in a convex shape.

6. The spiral lifting device for scissors fork according to claim 2, characterized in that: The plurality of limiting slide grooves (9) are arranged in a convex shape, the limiting slide grooves (9) are slidably connected to the first convex plate (15) and the second convex plate (17), and the first convex plate (15) and the second convex plate (17) are alternately staggered in the plurality of limiting slide grooves (9).

7. The spiral lifting device for scissors fork according to claim 3, characterized in that: The first rack (16) and the second rack (18) are respectively slidably connected in the two movable grooves (10).

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