Scissor lift

Abstract

The utility model discloses a kind of shearing type lifting devices, including lower support assembly, upper support assembly and shear fork assembly;Shear fork assembly includes first scissors arm and second scissors arm that are crossed and pivotally connected;The upper end of first scissors arm is fixed on upper support assembly by first upper connecting shaft, and lower end is slidably arranged on lower support assembly;The upper end of second scissors arm is connected and slidably arranged on upper support assembly by second upper connecting shaft, and lower end is pivotally connected on lower support assembly;Driving assembly is arranged below upper support assembly, and driving assembly includes locking member, fixed pulley set, movable pulley set and steel wire rope;Fixed pulley set includes first fixed pulley and second fixed pulley;One end of steel wire rope is fixed on second connecting shaft, and the other end is fixed on first fixed pulley.By worm and turbine engagement, realize elevator to move upwards or downwards, stay at any position in moving process, without power output in staying process, improve use flexibility while having energy-saving effect.

Description

Technical Field

[0001] This utility model belongs to the technical field of logistics and transportation equipment, and in particular relates to a scissor lift device. Background Technology

[0002] Scissor lifts are a common type of logistics transportation equipment. Most existing scissor lifts use hydraulic cylinders as the core driving component, achieving the lifting and lowering of the platform through a hydraulic system. For example, Chinese patent CN214296023U, "Trolley for Film Rolls with Adjustable Platform Curvature," discloses a typical hydraulically driven scissor lift structure, which uses the extension and retraction of the cylinder to drive the movement of the scissor fork assembly, thereby achieving the lifting and lowering of the carrying platform.

[0003] However, this type of existing technology has several significant drawbacks. First, due to the limitations of the structure and working principle of the hydraulic cylinder itself, the lifting device can only achieve stable stopping in two positions: fully retracted (initial height) and fully extended (maximum height). It cannot reliably stop at any height during the lifting process, which limits the flexibility and operational accuracy of the equipment.

[0004] Secondly, since the hydraulic cylinder does not have a locking function, there is a risk of slippage or falling after the scissor lift is fully extended, which poses a certain safety hazard.

[0005] Furthermore, hydraulic cylinders require continuous oil supply and pressure maintenance during ascent, brief pauses, and descent, resulting in significant energy consumption. This not only leads to high operating costs but also fails to meet current energy-saving and environmentally friendly production requirements. Simultaneously, prolonged continuous operation of the hydraulic system can cause problems such as increased oil temperature and accelerated aging of seals, further increasing the system's failure rate and maintenance costs.

[0006] In addition, to meet the lifting requirements of heavier loads, existing technologies usually require the use of larger hydraulic cylinders or higher pressure hydraulic systems, which increases the overall manufacturing and operating costs of the system.

[0007] Therefore, it is necessary to optimize the drive and stopping structure of the existing scissor lift device to address its shortcomings in terms of position control accuracy, energy consumption, and service life. Utility Model Content

[0008] The purpose of this invention is to solve the above-mentioned problems existing in the prior art and to provide a scissor lifting device.

[0009] The objective of this utility model is achieved through the following technical solution: A scissor lift device includes a lower support assembly, an upper support assembly, and a scissor fork assembly connecting the two. The scissor fork assembly consists of a first scissor arm and a second scissor arm that cross and are pivotally connected. The upper end of the first scissor arm is fixed to the upper support assembly via a first upper connecting shaft, and the lower end is slidably disposed on the lower support assembly. The upper end of the second scissor arm is connected to and slidably disposed on the upper support assembly via a second upper connecting shaft, and the lower end is pivotally connected to the lower support assembly. A drive assembly is disposed below the upper support assembly. The drive assembly includes a locking member fixedly connected to the upper support assembly and located between the two first upper connecting shafts, a fixed pulley assembly, at least one movable pulley assembly disposed on the second upper connecting shaft, and a pulley system wound around the upper support assembly. The fixed pulley group and the movable pulley group are equipped with steel wire ropes; the fixed pulley group includes a first fixed pulley disposed between the locking member and the upper support assembly and a second fixed pulley disposed on the second upper connecting shaft; one end of the steel wire rope is fixed to the second connecting shaft and the other end is fixed to the first fixed pulley; the drive assembly is activated to drive the locking member to rotate, thereby driving the fixed pulley group and the movable pulley group to rotate, while adjusting the length of the middle section of the steel wire rope to change the distance between the upper support assembly and the lower support assembly, thereby achieving lifting and lowering, and the steel wire rope between two adjacent fixed pulleys and the movable pulley remains taut throughout the lifting and lowering process; the upper support assembly can stop at any position during the lifting and lowering process.

[0010] Preferably, the upper support assembly includes two parallel upper profiles and a support platform fixed to the top surface of the upper profiles; the upper profiles are U-shaped and the opening directions of the two upper profiles are opposite; two first upper connecting shafts pass through the upper profiles; the two ends of the second upper connecting shafts abut against the bottom of the groove of the upper profiles and slide along the setting direction of the upper profiles during the lifting process.

[0011] Preferably, the locking member is disposed on the mounting plate, the mounting plate being located at one end of the support platform and fixed to the inner side of the support platform; the locking member includes a rotating shaft passing through the mounting plate and arranged parallel to the upper profile, a worm gear disposed on the output end of the rotating shaft, and a worm wheel disposed on the inner side of the mounting plate; the worm gear meshes with the worm wheel; a connecting shaft passes through the center of the mounting plate and the worm wheel, and is fixedly connected to the bottom surface of the mounting plate.

[0012] Preferably, the first fixed pulley is fixedly connected to the upper surface of the worm gear and rotates synchronously with the worm gear; the connecting shaft passes through the center of the first fixed pulley.

[0013] Preferably, the movable pulley group includes a first movable pulley and a second movable pulley; the first movable pulley, the second movable pulley and the second fixed pulley are parallel to and coplanar with the first fixed pulley; the first movable pulley is fixed to the first upper connecting shaft by a support frame; the second movable pulley and the second fixed pulley are both fixed to the second upper connecting shaft by the support frame.

[0014] Preferably, the first scissor arm and the second scissor arm are of equal length, both are frame structures, and both are connected by a pivot on an axis of symmetry along their length direction; both the first scissor arm and the second scissor arm are provided with at least one support plate parallel to the first upper connecting shaft or the second upper connecting shaft.

[0015] Preferably, the lower support assembly includes at least two parallel base plates and two lower profiles connecting the base plates; the lower profiles are parallel to the upper profiles and form a U-shape, with the opening directions of the two lower profiles facing each other; a first lower connecting shaft passes through the lower end of the first scissor arm, and both ends of the first lower connecting shaft abut against the bottom of the groove of the lower profile, and slide along the setting direction of the lower profile during the lifting process.

[0016] Preferably, the lower support assembly further includes a swivel wheel with braking function disposed at the bottom of the base plate.

[0017] The advantages of this utility model's technical solution are mainly reflected in: This utility model enables the elevator to move up or down by meshing a worm gear and a worm wheel, and can lock at any position during the movement to stop the upper support assembly from moving. No power output is required during the stationary phase, which improves the flexibility of use and has an energy-saving effect. The worm gear structure enables the fixed pulley block and the movable pulley block to rotate and move relative to each other. During the movement, the length of the wire rope is adjusted, thereby changing the distance between the movable pulley block and the fixed pulley block, that is, changing the distance between the upper ends of the first scissor arm and the second scissor arm, so as to realize the lifting action of the scissor lift. The required power output and consumption are small, effectively reducing the cost of use and maintenance. This invention significantly reduces the bending stress that the wire rope experiences each time it passes over the first fixed pulley by increasing its diameter, thereby extending the life of the wire rope, improving system efficiency, and enhancing operational safety. Attached Figure Description

[0018] Figure 1 : A perspective view of a preferred embodiment of the present invention; Figure 2 Cross-sectional view of a preferred embodiment of this utility model; Figure 3: A partial hidden perspective view of a preferred embodiment of this utility model; Figure 4 : A partial hidden top view of a preferred embodiment of this utility model. Detailed Implementation

[0019] The purpose, advantages, and features of this utility model will be illustrated and explained through the following non-limiting description of preferred embodiments. These embodiments are merely typical examples of applying the technical solutions of this utility model, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by this utility model.

[0020] In the description of the solution, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience and simplification of description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Also, in the description of the solution, with the operator as a reference, the direction closer to the operator is the proximal end, and the direction farther from the operator is the distal end.

[0021] This utility model discloses a scissor-type lifting device, including as follows: Figure 1 The diagram shows the lower support assembly 1, the upper support assembly 2, and the scissor lift assembly 3 connecting the two. (Combined) Figure 1 and Figure 3 As shown, the lower support assembly 1 includes at least two parallel base plates 10 and two lower profiles 11 connecting the base plates 10. The two lower profiles 11 are parallel and U-shaped, and their opening directions are opposite. The lower profiles 11 define the direction of movement of the first lower connecting shaft 312 in the scissor lift assembly 3. Furthermore, the lower support assembly 1 also includes casters 12 with braking function disposed at the bottom of the base plates 10.

[0022] like Figures 2-3 As shown, the upper support assembly 2 includes two parallel upper profiles 21 and a support platform 22 fixed to the top surface of the upper profiles 21. The upper profiles 21 are U-shaped, and the opening directions of the two upper profiles 21 are opposite. Similarly, the upper profiles 21 are used to limit the movement direction of the first upper connecting shaft 311 in the scissor lift assembly 3.

[0023] The scissor assembly 3 is composed of, for example Figure 2The first scissor arm 31 and the second scissor arm 32 shown intersect and are pivotally connected. Specifically, the first scissor arm 31 and the second scissor arm 32 are of equal length, both are frame structures, and both are connected by a pivot along their length axis of symmetry. That is, the first scissor arm 31 and the second scissor arm 32 are rectangular in shape, and each of the first scissor arm 31 and the second scissor arm 32 has at least one support plate 30 connected to the outer wall of the first scissor arm 31 or the second scissor arm 32, and the support plate 30 is perpendicular to the upper profile 21 and the lower profile 11. By providing the support plate on the inner side of the first scissor arm 31 and the second scissor arm 32, their overall strength can be enhanced and their reliability improved.

[0024] Furthermore, the upper end of the first scissor arm 31 is fixed to the upper support assembly 2 via a first upper connecting shaft 311, and the lower end is slidably disposed on the lower support assembly 1. Specifically, the first scissor arm 31 has a first upper connecting shaft 311 and a first lower connecting shaft 312 respectively at both ends, and the first upper connecting shaft 311 and the first lower connecting shaft 312 are arranged parallel to the support plate 30. The two first upper connecting shafts 311 pass through the upper profile 21 and are coaxially arranged. A first lower connecting shaft 312 passes through the lower end of the first scissor arm 31, and the two ends of the first lower connecting shaft 312 abut against the bottom of the groove of the lower profile 11, and slide along the setting direction of the lower profile 11 during the lifting and lowering process.

[0025] like Figure 3 As shown, the upper end of the second scissor arm 32 is connected to and slidably mounted on the upper support assembly 2 via a second upper connecting shaft 321, and the lower end is pivotally connected to the lower support assembly 1. That is, both ends of the second upper connecting shaft 321 penetrate the outer wall of the second scissor arm 32 and abut against the bottom of the groove of the upper profile 21, and the second upper connecting shaft 321 slides along the setting direction of the upper profile 21 during lifting and lowering. The lower end of the scissor arm 32 is pivotally connected to the lower profile 11. The second upper connecting shaft 321 is parallel to the support plate 30.

[0026] Combination Figure 1 and Figure 2 As shown, a drive assembly 4 is disposed below the upper support assembly 2. The drive assembly 4 includes a locking member 41 that is fixedly connected to the upper support assembly 2 and located between the two first upper connecting shafts 311. Specifically, as shown... Figure 2 or Figure 3As shown, the locking member 41 is disposed on the mounting plate 410, which is located at one end of the support platform 22 and fixed to the inner side of the support platform 22. Further, the locking member 41 includes a rotating shaft 411 that passes through the mounting plate 410 and is parallel to the upper profile 21, a worm gear 412 disposed on the output end of the rotating shaft 411, and a worm wheel 413 disposed on the inner side of the mounting plate 410. A connecting shaft 414 passes through the center of the mounting plate 410 and the worm wheel 413, and is fixedly connected to the bottom surface of the mounting plate 410; that is, the mounting plate 410 is penetrated by the connecting shaft 414, and the connecting shaft 414 is coaxially disposed with the worm wheel 413. This invention enables the elevator to move upwards or downwards by engaging the worm gear 412 and the worm wheel 412, and locks during movement, allowing the support platform 22 in the upper support assembly 2 to stop at any position. No power output is required during stopping, improving usability and saving energy. Specifically, stopping the worm gear stops the worm wheel's rotation, thus achieving the locking function.

[0027] The drive assembly 4 further includes a fixed pulley block 42 and a movable pulley block 43. For example... Figures 3-4 As shown, the fixed pulley assembly 42 includes a first fixed pulley 421 disposed between the locking member 41 and the upper support assembly 2, and a second fixed pulley 422 disposed on the second upper connecting shaft 321. The first fixed pulley 421 is fixedly connected to the upper surface of the worm gear 412 and rotates synchronously with the worm gear 412; the connecting shaft 414 passes through the center of the first fixed pulley 421. Figure 4 As shown, the drive assembly 4 further includes a movable pulley group 43 disposed on the second upper connecting shaft 321. The movable pulley group 43 has at least one movable pulley; preferably, two movable pulleys are provided in this invention, i.e., the movable pulley group 43 includes a first movable pulley 431 and a second movable pulley 432. The first movable pulley 431, the second movable pulley 432, and the second fixed pulley 422 are parallel to and coplanar with the first fixed pulley 421; this arrangement minimizes the required length of the wire rope and reduces the traction force of the wire rope to a certain extent, thus reducing wear on the wire rope. Furthermore, the first movable pulley 431 is fixed to the first upper connecting shaft 311 by a support frame 40, and the second movable pulley 432 and the second fixed pulley 422 are also fixed to the second upper connecting shaft 321 by the support frame 40.

[0028] The drive assembly 4 further includes a steel wire rope 44 wound around the fixed pulley group 42 and the movable pulley group 43. One end of the steel wire rope 44 is fixed to the second connecting shaft 321, and the other end is fixed to the first fixed pulley 421; the middle section of the steel wire rope 44 is wound sequentially around the first fixed pulley 421, the first movable pulley 431, the second fixed pulley 422, and the second movable pulley 432. Activating the drive assembly 4 drives the locking member 41 to rotate, thereby rotating the fixed pulley group 42 and the movable pulley group 43. Simultaneously, adjusting the length of the middle section of the steel wire rope 44 changes the distance between the upper support assembly 2 and the lower support assembly 1, achieving lifting and lowering. During the lifting and lowering process, the steel wire rope 44 between adjacent fixed pulleys and movable pulleys remains taut. The upper support assembly 2 can stop at any position during the lifting and lowering process. Therefore, this utility model utilizes a worm gear structure to achieve rotation and relative movement of the fixed and movable pulley groups. During this movement, the length of the wire rope is adjusted, thereby changing the distance between the movable and fixed pulley groups, i.e., changing the distance between the upper ends of the first and second scissor arms, to achieve the lifting action of the scissor lift. Specifically, when the worm rotates forward, it drives the worm wheel to rotate synchronously, causing the first fixed pulley to rotate synchronously with the worm wheel. The first fixed pulley gradually tightens and reduces the distance in the middle section of the wire rope, thereby driving the movable pulley group to gradually approach the fixed pulley group, thus achieving the lifting action of the support platform. Similarly, when the worm rotates in the reverse direction, it drives the support platform to descend. That is, during the descent, the distance in the middle section of the wire rope gradually increases, and simultaneously, the first and second upper connecting shafts move downwards under the gravity of the first and second scissor arms, thus achieving the descent of the support platform. The overall operation requires relatively low power output and consumption, effectively reducing usage and maintenance costs.

[0029] Furthermore, this invention preferably aligns the first fixed pulley 421 and the first movable pulley 431, and the second fixed pulley 422 and the second movable pulley 432, on a straight line. Preferably, the diameter of the first fixed pulley 421 is larger than the diameter of the first movable pulley 431; this is to minimize the cumulative bending stress borne by the same section of wire rope (especially the section that repeatedly passes over the first fixed pulley 421). Therefore, by increasing the diameter of the first fixed pulley 421, this invention can significantly reduce the bending stress borne by the wire rope 44 each time it passes over it, thereby extending the lifespan of the wire rope 44, improving system efficiency, and enhancing operational safety.

[0030] This utility model has many other embodiments. All technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of this utility model.

Claims

1. A scissor lift device, comprising a lower support assembly (1), an upper support assembly (2), and a scissor fork assembly (3) connecting the two; characterized in that: The scissor lift assembly (3) is composed of a first scissor arm (31) and a second scissor arm (32) that cross and pivotally connect. The upper end of the first scissor arm (31) is fixed to the upper support assembly (2) via a first upper connecting shaft (311), and the lower end is slidably disposed on the lower support assembly (1). The upper end of the second scissor arm (32) is connected to and slidably disposed on the upper support assembly (2) via a second upper connecting shaft (321), and the lower end is pivotally connected to the lower support assembly (1). A drive assembly (4) is disposed below the upper support assembly (2). The drive assembly (4) includes a locking member (41) fixedly connected to the upper support assembly (2) and located between the two first upper connecting shafts (311), a fixed pulley group (42), a movable pulley group (43) disposed on the second upper connecting shaft (321), and a pulley group (43) wound around the fixed pulley group (42) and the movable pulley group (43). The steel wire rope (44); the fixed pulley group (42) includes a first fixed pulley (421) disposed between the locking member (41) and the upper support assembly (2) and a second fixed pulley (422) disposed on the second upper connecting shaft (321); one end of the steel wire rope (44) is fixed on the second upper connecting shaft (321), and the other end is fixed on the first fixed pulley (421); the drive assembly (4) is activated to drive the locking member (41) to rotate, thereby driving the fixed pulley group (42) and the movable pulley group (43) to rotate, while adjusting the length of the middle section of the steel wire rope (44), changing the distance between the upper support assembly (2) and the lower support assembly (1), realizing lifting and lowering, and the steel wire rope (44) between two adjacent fixed pulleys and movable pulleys always remains taut during the lifting and lowering process; the upper support assembly (2) can stop at any position during the lifting and lowering process.

2. The scissor-type lifting device according to claim 1, characterized in that: The upper support assembly (2) includes two parallel upper profiles (21) and a support platform (22) fixed to the top surface of the upper profiles (21); the upper profiles (21) are U-shaped and the opening directions of the two upper profiles (21) are opposite; two first upper connecting shafts (311) pass through the upper profiles (21); the two ends of the second upper connecting shaft (321) abut against the bottom of the groove of the upper profiles (21) and slide along the setting direction of the upper profiles (21) during the lifting process.

3. A scissor-type lifting device according to claim 2, characterized in that: The locking member (41) is disposed on the mounting plate (410), which is located at one end of the support platform (22) and fixed to the inner side of the support platform (22). The locking member (41) includes a rotating shaft (411) that passes through the mounting plate (410) and is arranged parallel to the upper profile (21), a worm (412) disposed on the output end of the rotating shaft (411), and a worm wheel (413) disposed on the inner side of the mounting plate (410). The worm (412) meshes with the worm wheel (413). A connecting shaft (414) passes through the center of the mounting plate (410) and the worm wheel (413) and is fixedly connected to the bottom surface of the mounting plate (410).

4. A scissor-type lifting device according to claim 3, characterized in that: The first fixed pulley (421) is fixedly connected to the upper surface of the worm (412) and rotates synchronously with the worm wheel (413); the connecting shaft (414) passes through the center of the first fixed pulley (421).

5. A scissor-type lifting device according to claim 4, characterized in that: The movable pulley group (43) includes a first movable pulley (431) and a second movable pulley (432); the first movable pulley (431), the second movable pulley (432) and the second fixed pulley (422) are parallel to and coplanar with the first fixed pulley (421); the first movable pulley (431) is fixed to the first upper connecting shaft (311) by a support frame (40); the second movable pulley (432) and the second fixed pulley (422) are both fixed to the second upper connecting shaft (321) by the support frame (40).

6. A scissor-type lifting device according to claim 2, characterized in that: The first scissor arm (31) and the second scissor arm (32) are of equal length, both of which are frame structures, and both are connected by a pivot on the axis of symmetry along the length direction; both the first scissor arm (31) and the second scissor arm (32) are provided with at least one support plate (30) parallel to the first upper connecting shaft (311) or the second upper connecting shaft (321).

7. A scissor-type lifting device according to claim 6, characterized in that: The lower support assembly (1) includes at least two parallel base plates (10) and two lower profiles (11) connecting the base plates (10); the lower profiles (11) are parallel to the upper profiles (21) and are U-shaped, and the opening directions of the two lower profiles (11) are opposite; a first lower connecting shaft (312) passes through the lower end of the first scissor arm (31), and the two ends of the first lower connecting shaft (312) abut against the bottom of the groove of the lower profile (11), and slide along the setting direction of the lower profile (11) during the lifting process.

8. A scissor-type lifting device according to claim 7, characterized in that: The lower support assembly (1) also includes a universal wheel (12) with braking function disposed at the bottom of the base plate (10).

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