Anti-unbalance loading three-section lifting column structure with double-lead-screw synchronous thrust

Abstract

The utility model discloses an anti-unbalance loading three-section lifting column structure with double-screw synchronous thrust, and relates to the technical field of mechanical transmission and control. According to the utility model, the power of the motor is transmitted to the reduction gearbox, and after speed reduction and torque increase, the power is transmitted to the gearbox through the transmission gear set to drive the left-handed ball screw and the right-handed ball screw which are horizontally parallel to each other to rotate synchronously. The ejector rod is in threaded connection with the outer wall of the right-handed rotation ball screw, the screw rods rotate to enable the ejector rod to do linear motion, the two screw rods synchronously and reversely rotate to achieve simultaneous lifting and load pushing or pulling on the two sides, compared with a screw rod and chain structure, the double-screw-rod structure is free of chains, the gap problem caused by chain abrasion is avoided, stable operation of the lifting column can be guaranteed, and the service life of the lifting column is prolonged. And the cargo falling risk is reduced. Meanwhile, the design of a hollow lead screw is abandoned, the two solid lead screws are adopted, the strength is higher, the size and weight are smaller, the transmission efficiency is higher, continuous work can be achieved in an automatic production line, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission and control technology, specifically a three-section lifting column structure with anti-eccentric load and synchronous thrust of double lead screws. Background Technology

[0002] Lifting equipment plays a vital role in numerous fields such as industrial automation, logistics and transportation, smart warehousing, and security. Among them, three-section lifting columns, as a common lifting device, are widely used in scenarios requiring height adjustment.

[0003] Traditional three-section lifting bollards primarily employ one of two transmission structures: a lead screw and chain, or a lead screw and a hollow lead screw. In the lead screw and chain transmission structure, the chain wears down over time, leading to increased backlash. When the lifting bollard is subjected to an eccentric load, this backlash causes noticeable vibration during its downward movement. For example, in a logistics warehouse, if a lifting bollard with this structure is used to transport goods, even a slight deviation in the placement of the goods can create an eccentric load, causing the bollard to vibrate. This not only affects the stability of the goods handling but may also cause goods to fall, resulting in loss.

[0004] The transmission structure combining a lead screw and a hollow lead screw also has its drawbacks. Because a solid lead screw needs to be housed inside, the hollow lead screw has a larger outer diameter, increasing both overall size and weight, and resulting in low transmission efficiency. Furthermore, the hollow lead screw has relatively low strength and is prone to deformation under heavy loads, making it unsuitable for continuous operation. For example, in frequently used automated production lines, lifting columns with this structure require frequent shutdowns for cooling; one minute of operation may necessitate a three-minute rest, severely impacting production efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a three-section lifting column structure with anti-eccentric load and synchronous thrust of dual lead screws, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides a three-section lifting column structure with anti-eccentric load and synchronous thrust of dual lead screws. The structure includes a lower fixed plate as the basic support component of the device; a left-handed ball screw and a right-handed ball screw arranged horizontally side-by-side, with the left-handed ball screw rotatably connected to the lower fixed plate; a gearbox fixing plate for fixing the gearbox; a transmission gear set disposed inside the gearbox for transmitting power; a reduction gearbox and a motor, with the motor positioned directly above the reduction gearbox and connected to it via a transmission gear set to drive the left-handed and right-handed ball screws; and a push rod threadedly connected to the outer wall of the right-handed ball screw.

[0007] Furthermore, an upper fixing plate is fixedly connected to the end of the top rod away from the right-hand ball screw, and the right-hand ball screw is rotatably connected to the outer wall of the gearbox.

[0008] Furthermore, there are three aluminum cylinders, which are nested together axially, with their inner diameter decreasing from bottom to top, forming a nested structure.

[0009] Furthermore, the outer wall of the aluminum cylinder is provided with grooves.

[0010] Furthermore, the grooves of each aluminum cylinder are adapted to the adjacent aluminum cylinders.

[0011] Furthermore, the three aluminum cylinders are connected in pairs, with the sliding grooves of each aluminum cylinder fitting together, and the adjacent aluminum cylinders maintain relative linear sliding, while limiting each other during the sliding process.

[0012] Furthermore, the transmission gear set consists of three meshing gears, one of which is fixedly mounted on the outer wall of the left-hand ball screw, another gear is fixedly mounted on the end of the right-hand ball screw away from the push rod, and the last one is mounted on one side of the gearbox. Each gear meshes with the adjacent gear.

[0013] Furthermore, the upper fixing plate is installed on the top of the aluminum cylinder with the smallest inner diameter, and the lower fixing plate is installed on the bottom of the aluminum cylinder with the largest inner diameter.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. In this utility model, after the motor starts, the power is transmitted to the reduction gearbox. After reduction and torque amplification, it is transmitted to the gearbox through the transmission gear set, driving the horizontally parallel left-hand and right-hand ball screws to rotate synchronously. The push rod is threaded to the outer wall of the right-hand ball screw. The rotation of the screw causes the push rod to move linearly. The synchronous counter-rotation of the two screws realizes simultaneous lifting and lowering on both sides, pushing or pulling the load. Compared with the screw and chain structure, this double screw structure has no chain, avoiding the gap problem caused by chain wear. When handling goods in logistics warehouses, it can ensure the stable operation of the lifting column and reduce the risk of goods falling. At the same time, it abandons the hollow screw design and adopts two solid screws, which have higher strength, smaller size and weight, and higher transmission efficiency. It can work continuously in automated production lines, improving production efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0018] Figure 3 This is a schematic diagram of the connection structure between the aluminum cylinder and the slide in this utility model;

[0019] Figure 4 This is an overall structural diagram of the upper and middle fixing plates in this utility model.

[0020] In the diagram: 1. Lower fixed plate; 2. Left-hand ball screw; 3. Gearbox fixed plate; 4. Transmission gear set; 5. Reducer; 6. Motor; 7. Right-hand ball screw; 8. Top rod; 9. Upper fixed plate; 10. Aluminum cylinder; 11. Slide groove. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-4 This utility model provides a technical solution:

[0023] See Figures 1-4 As shown, a three-section lifting column structure with anti-eccentric load and synchronous thrust of dual lead screws includes a lower fixed plate 1, which serves as the basic support component of the device; a left-handed ball screw 2 and a right-handed ball screw 7, which are arranged horizontally side by side, with the left-handed ball screw 2 rotatably connected to the lower fixed plate 1; a gearbox fixing plate 3 for fixing the gearbox; a transmission gear set 4, which is set inside the gearbox for transmitting power; a reduction gearbox 5 and a motor 6, with the motor 6 located directly above the reduction gearbox 5 and connected to it in a transmission manner; the reduction gearbox 5 and the gearbox are connected through the transmission gear set 4 to drive the left-handed ball screw 2 and the right-handed ball screw 7; and a push rod 8, which is threadedly connected to the outer wall of the right-handed ball screw 7.

[0024] After the motor 6 starts, the power generated is transmitted to the reduction gearbox 5. The reduction gearbox 5 reduces the power and increases the torque, and then transmits the power to the gearbox through the transmission gear set 4. Since the left-hand ball screw 2 and the right-hand ball screw 7 are arranged horizontally side by side and are respectively connected to the gearbox, the left-hand ball screw 2 and the right-hand ball screw 7 will rotate synchronously under the action of the transmission gear set 4.

[0025] When the left-hand ball screw 2 and the right-hand ball screw 7 rotate, because the push rod 8 is threadedly connected to the outer wall of the right-hand ball screw 7, the rotation of the right-hand ball screw 7 will cause the push rod 8 to move linearly along the axial direction of the screw. The left-hand ball screw 2 and the right-hand ball screw 7 rotate synchronously in opposite directions, thereby achieving the effect of simultaneous lifting and lowering on both sides, jointly pushing or pulling the load connected to the push rod 8.

[0026] Compared to the lead screw and chain transmission structure, this dual-lead screw synchronous thrust anti-eccentric load three-section lifting column structure has no chain, thus eliminating the problem of increased clearance due to chain wear. In logistics warehouse cargo handling scenarios, even if the cargo placement results in an eccentric load, factors such as chain clearance will not cause the lifting column to vibrate downwards, ensuring the stability of cargo handling, reducing the risk of cargo falling, and avoiding losses.

[0027] This design abandons the hollow lead screw design found in lead screw plus hollow lead screw structures, instead employing two solid left-hand ball screws 2 and right-hand ball screws 7. Solid lead screws offer higher strength and are less prone to deformation under heavy loads. Furthermore, they avoid the drawbacks of large outer diameters associated with hollow lead screws, reducing overall size and weight while improving transmission efficiency. In automated production lines where frequent use of lifting columns is required, this design meets the demands of continuous operation, eliminating the need for frequent shutdowns for cooling as required by lead screw plus hollow lead screw structures, thus significantly improving production efficiency.

[0028] The left-hand ball screw 2 and the right-hand ball screw 7 are driven by the same motor 6 and reduction gearbox 5 through the transmission gear set 4, achieving synchronous rotation and generating synchronous thrust. This design makes the lifting column more evenly stressed during lifting, further enhancing its resistance to eccentric loads, improving overall stability and reliability, and enabling it to adapt to more complex working environments and load conditions.

[0029] See Figure 1-2 The top rod 8 is fixedly connected to an upper fixing plate 9 at the end away from the right-hand ball screw 7, and the right-hand ball screw 7 is rotatably connected to the outer wall of the gearbox.

[0030] The right-hand ball screw 7 is rotatably connected to the outer wall of the gearbox, enabling the power generated by the transmission gear set 4 inside the gearbox to be efficiently transmitted to the right-hand ball screw 7. The power inside the gearbox directly drives the rotation of the right-hand ball screw 7 through the connection point, reducing energy loss and mechanical interference during power transmission. Unlike the low transmission efficiency caused by the hollow screw design in the screw-plus-hollow screw structure, this connection method ensures that the right-hand ball screw 7 can rotate stably and quickly, thereby improving the overall transmission efficiency of the lifting column and enabling it to complete the lifting action more quickly, meeting the high-efficiency requirements in actual work.

[0031] See Figure 1 There are three aluminum cylinders 10, which are nested together along the axial direction, with the inner diameter decreasing from bottom to top to form a nested structure.

[0032] The nested design of three aluminum cylinders 10, combined with a dual-screw synchronous thrust structure, enables long-stroke linear motion. As the screws rotate, the top rod 8 drives the upper fixed plate 9 to rise or fall, and the aluminum cylinders 10 unfold or retract sequentially, meeting the application requirements for long-distance lifting and lowering, such as cargo lifting and handling in logistics warehouses and component height adjustment in automated production lines. Compared to the potential jamming and instability issues that may occur in traditional structures during long-stroke operation, this nested aluminum cylinder 10 structure ensures a smoother and more stable lifting process, improving the equipment's working efficiency and reliability.

[0033] The aluminum cylinder 10 itself can protect key components such as the lead screw and top rod 8 inside. The nested structure allows the overlapping parts of the aluminum cylinders 10 to effectively prevent dust, moisture, and other external impurities from entering the equipment. This protective function is particularly important in outdoor or dusty and humid working environments. It can reduce problems such as component wear and corrosion caused by the intrusion of impurities, extend the service life of the equipment, reduce maintenance costs, and solve the problem of traditional lifting columns being unable to be waterproof and dustproof.

[0034] See Figure 1 The outer wall of the aluminum cylinder 10 is provided with a sliding groove 11.

[0035] The slide rail 11 provides precise guidance for its cooperating components, ensuring that the aluminum cylinder 10 and its connected components, such as the top rod 8 and the upper fixing plate 9, rise and fall smoothly along a predetermined trajectory during operation. In practical applications, such as when handling goods in a logistics warehouse, even if the placement of goods creates an eccentric load, the slide rail 11 can effectively limit the movement direction of the aluminum cylinder 10, preventing it from shifting or swaying, thereby improving the stability of the entire lifting column and avoiding situations where goods fall due to swaying.

[0036] See Figure 1 Each aluminum cylinder 10 has a groove 11 that is compatible with the adjacent aluminum cylinder 10.

[0037] The mutually adaptable sliding grooves 11 enhance the tightness and integrity of the connection between the aluminum cylinders 10. When subjected to external forces, such as vibrations and impacts during equipment operation, each aluminum cylinder 10 can evenly distribute the force across the entire structure through the sliding grooves 11. This coordinated force-bearing method improves the overall structural strength of the lifting column, enabling it to withstand greater loads. Compared to traditional structures, it is less prone to deformation or damage due to excessive local stress, thus extending the service life of the equipment.

[0038] See Figure 3 The three aluminum cylinders 10 are connected in pairs, and the sliding grooves 11 of each aluminum cylinder 10 are matched. The adjacent aluminum cylinders 10 maintain relative linear sliding and limit each other during the sliding process.

[0039] In practical applications, such as on automated production lines, equipment requires extremely high lifting precision. This type of fit between the aluminum cylinders 10 ensures that adjacent cylinders 10 can only slide relative to each other along a straight line during operation, reducing swaying and offset during lifting. Each aluminum cylinder 10 can move precisely along a preset trajectory, thus ensuring stable and accurate lifting of the connected upper fixed plate 9 and the items it carries. This avoids damage to items or production errors caused by unstable lifting, improving the accuracy and reliability of the entire production process.

[0040] See Figure 2 The transmission gear set 4 consists of three meshing gears. One gear is fixedly installed on the outer wall of the left-hand ball screw 2, another gear is fixedly installed on the end of the right-hand ball screw 7 away from the push rod 8, and the last one is installed on one side of the reduction gearbox 5. Each gear meshes with the adjacent gear.

[0041] One gear is fixed to the outer wall of the left-hand ball screw 2, and the other is fixed to the end of the right-hand ball screw 7 away from the top rod 8. Through gear transmission connected to the reduction gearbox 5 in the middle, the left-hand ball screw 2 and the right-hand ball screw 7 can be ensured to rotate synchronously. This allows the thrust or pull generated by the two screws to act synchronously, ensuring that the lifting column rises and falls smoothly on both sides simultaneously. When handling large and irregularly shaped goods, if the lifting on both sides is not synchronized, the goods are prone to tilting or even falling. This structure effectively avoids such problems, improving the safety and stability of handling.

[0042] See Figure 1-3 The upper fixing plate 9 is installed on the top of the aluminum cylinder 10 with the smallest inner diameter, and the lower fixing plate 1 is installed on the bottom of the aluminum cylinder 10 with the largest inner diameter.

[0043] The bottom of the aluminum cylinder 10 with the largest diameter is fitted with a lower fixing plate 1, which better distributes the weight from the entire device and the load, making the stress on the entire structure more even. Because the bottom aluminum cylinder 10 has a large inner diameter and relatively thick walls, its load-bearing capacity is stronger. The lower fixing plate 1 evenly distributes the weight to the ground or supporting structure, effectively preventing structural damage caused by excessive localized stress. Similarly, the upper fixing plate 9 is installed on the aluminum cylinder 10 with the smallest inner diameter, which can rationally transfer the weight of the load to the aluminum cylinder 10 structure, ensuring the safety and reliability of the entire lifting column when carrying heavy objects.

[0044] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A three-section lifting column structure with dual-screw synchronous thrust and anti-eccentric load, characterized in that: The lower fixed plate (1) serves as the basic support component of the device; A left-hand ball screw (2) and a right-hand ball screw (7) are arranged horizontally side by side, and the left-hand ball screw (2) is rotatably connected to the lower fixed plate (1); Gearbox mounting plate (3) is used to fix the gearbox; The transmission gear set (4) is installed inside the gearbox and is used to transmit power; The gearbox (5) and the motor (6) are located directly above the gearbox (5) and are connected to the gearbox (5) in a transmission. The gearbox (5) is connected to the gearbox through a transmission gear set (4) to drive the left-hand ball screw (2) and the right-hand ball screw (7). The push rod (8) is threaded to the outer wall of the right-hand ball screw (7).

2. The anti-eccentric load three-section lifting column structure with dual lead screw synchronous thrust as described in claim 1, characterized in that: The top rod (8) is fixedly connected to an upper fixing plate (9) at the end away from the right-hand ball screw (7), and the right-hand ball screw (7) is rotatably connected to the outer wall of the gearbox.

3. The anti-eccentric load three-section lifting column structure with dual lead screw synchronous thrust as described in claim 2, characterized in that: There are three aluminum cylinders (10), which are nested together along the axial direction, with the inner diameter decreasing from bottom to top to form a nested structure.

4. The anti-eccentric load three-section lifting column structure with dual lead screw synchronous thrust as described in claim 3, characterized in that: The outer wall of the aluminum cylinder (10) is provided with a sliding groove (11).

5. The anti-eccentric load three-section lifting column structure with dual lead screw synchronous thrust as described in claim 4, characterized in that: The groove (11) of each aluminum cylinder (10) is adapted to the adjacent aluminum cylinder (10).

6. The anti-eccentric load three-section lifting column structure with dual lead screw synchronous thrust as described in claim 5, characterized in that: The three aluminum cylinders (10) are connected in pairs, and the sliding grooves (11) of each aluminum cylinder (10) are matched. The adjacent aluminum cylinders maintain relative linear sliding and are mutually limited during the sliding process.

7. The anti-eccentric load three-section lifting column structure with dual lead screw synchronous thrust as described in claim 6, characterized in that: The transmission gear set (4) consists of three meshing gears. One gear is fixedly installed on the outer wall of the left-hand ball screw (2), another gear is fixedly installed on the end of the right-hand ball screw (7) away from the push rod (8), and the last one is installed on one side of the gearbox (5). Each gear meshes with the adjacent gear.

8. The anti-eccentric load three-section lifting column structure with dual lead screw synchronous thrust as described in claim 7, characterized in that: The upper fixing plate (9) is installed on the top of the aluminum cylinder (10) with the smallest inner diameter, and the lower fixing plate (1) is installed on the bottom of the aluminum cylinder (10) with the largest inner diameter.

Images