Lifting device

Abstract

The utility model provides a lifting device which comprises a lifting rod mechanism which comprises a plurality of rod bodies sequentially connected in the vertical direction, and the rod bodies comprise a top-layer rod body arranged at the top end, a bottom-layer rod body arranged at the bottom end and at least one middle-layer rod body take-up mechanism arranged between the top-layer rod body and the bottom-layer rod body. The take-up mechanism is independently arranged on one side of the lifting rod assembly, the take-up mechanism comprises a fixed roller assembly and a movable roller assembly which are oppositely arranged in the vertical direction and can relatively move in the vertical direction, and one end of a cable is fixed to the top-layer rod body; the other ends of the rollers are alternately wound on the fixed roller assembly and the movable roller assembly layer by layer from outside to inside and then are fixed on the bottom-layer rod body; the driving mechanism comprises a transmission assembly and a linkage assembly which are connected with each other; and the lifting speed of the lifting rod mechanism is equal to the speed of the take-up mechanism for taking up and paying off the cable. According to the utility model, the technical problem in the prior art that a lifting rod generates a large load on a cable during working is solved.

Description

Technical Field

[0001] The utility model relates to the field of lifting rods, in particular to a lifting device. Background Art

[0002] During the lifting process of the lifting mast 1, the cable 4 of the top equipment must follow the lifting process. Currently, the main methods for reeling and releasing the cable in the industry include manual reeling and releasing, reeling and releasing the cable using a reel 2, and reeling and releasing the cable using a spring cable 5. Manual reeling and releasing the cable requires specialized personnel to perform, cannot be automated, and is gradually being eliminated. Reeling reels 2 are available in two types: those with and without electric slip rings. Reeling reels 2 with electric slip rings are more expensive, typically costing several thousand yuan per electric slip ring. When the transmission signal is a radio frequency signal or an optical signal, the slip ring can cost tens of thousands or even hundreds of thousands of yuan. For reeling reels 2 without electric slip rings, when the lifting mast 1 is working, the reel 2 rotates. To prevent the cable 4 from becoming tangled, the cable 4 on the reel must be manually disconnected from the cable 4 on the ground, and the connector 3 must be manually plugged in and out. Automation is not possible, as shown in the figure. The reel 2 is generally driven by a scroll spring. When the lifting mast 1 rises, the reel 2 is driven by the cable 4 to rotate, storing energy in the scroll spring. When the lifting mast 1 descends, the scroll spring drives the reel 2 to rotate and retract the cable 4. As the lifting rod 1 continues to rise, the energy stored in the vortex spring increases. When the lifting rod 1 reaches its maximum height, the energy stored in the vortex spring is at its maximum. At this time, the torque generated by the vortex spring causes a large pulling force on the top of the lifting rod 1 through the cable 4. This pulling force increases the load on the lifting rod 1 and may damage the core wire inside the cable 4. As shown in the figure, the spring cable 5 is a combination of one or more springs and the cable 4, and the winding is completed by the automatic contraction of the spring. Figure 2 、 Figure 3 As shown, when installing the spring cable 5, it must be coaxial with the tube assembly of the lifting rod 1, with one end fixed to the top of the lifting rod 1 and the other end fixed to the bottom of the spring cable 5 frame. When the lifting rod 1 rises, its top drives the spring cable 5 to expand. When the lifting rod 1 descends, the spring cable 5 is retracted by the contraction force of the spring itself. When the spring cable 5 is stretched, its radial dimension decreases. To avoid interference with the tube assembly of the lifting rod 1 during stretching, existing spring cables 5 usually increase the spring diameter or the number of turns, resulting in the need for a longer cable 4. The required cable 4 length is generally more than twice the lifting stroke. When the lifting rod 1 is raised to its maximum, the spring cable 5 is fully extended, and the top of the lifting rod 1 bears the weight of the spring cable 5 and the downward force of the spring, which increases the load on the top of the lifting rod 1. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the present invention provides a lifting device, which solves the technical problem in the prior art that the lifting rod generates a large load on the cable during operation.

[0004] According to an embodiment of the present invention, a lifting device includes:

[0005] The lifting rod mechanism includes a plurality of rods connected in sequence in an up-down direction, wherein the plurality of rods include a top rod at the top, a bottom rod at the bottom, and at least one middle rod between the top rod and the bottom rod, and the top rod and / or the middle rod can be raised and lowered relative to the bottom rod;

[0006] A wire take-up mechanism is independently provided on one side of the lifting rod assembly, and includes a fixed roller assembly and a movable roller assembly that are arranged in an upward and downward direction and can move relative to each other. One end of the cable is fixed to the top rod body, and the other end of the cable is alternately wound around the fixed roller assembly and the movable roller assembly from the outside to the inside, and then fixed to the bottom rod body.

[0007] The driving mechanism includes a transmission assembly and a linkage assembly connected to each other, wherein the transmission assembly is used to drive the lifting rod mechanism to move up and down, and drives the take-up mechanism to retract and release the cable through the linkage assembly;

[0008] Wherein, the lifting speed of the lifting rod mechanism is equal to the speed of the cable retracting and releasing of the cable by the cable retracting mechanism.

[0009] Preferably, the fixed roller assembly and / or the movable roller assembly includes:

[0010] The two fixed plates are spaced apart and relatively fixed via a connecting shaft;

[0011] A plurality of roller groups are arranged at intervals from the outside to the inside, and a receiving area for the cable to pass through is constructed therebetween. Each roller group comprises a plurality of rollers arranged in a semicircle at equal intervals, and the rollers are rotatably arranged between the two fixed plates.

[0012] Preferably, the plurality of roller groups expand outwards at equal intervals with the axis of the connecting shaft as the center.

[0013] Preferably, a plurality of supporting rods are provided between the two fixing plates, and the plurality of supporting rods are passed through the plurality of rollers in a one-to-one correspondence.

[0014] Preferably, at least one of the two fixing plates is provided with a guard plate, and the guard plate is located in the accommodating area.

[0015] Preferably, the transmission assembly includes:

[0016] a gear set comprising a first gear, a second gear and a third gear meshed in sequence, wherein the first gear is driven by a motor;

[0017] A lifting screw rod is arranged on the third gear along the up-down direction, and the lifting screw rod extends into the rod body to drive the lifting rod assembly to move up and down.

[0018] Preferably, the linkage component includes:

[0019] a fourth gear meshing with the third gear;

[0020] The wire take-up screw rod is arranged on the fourth gear along the up-down direction. The wire take-up screw rod is connected to the movable roller assembly and is used to drive the movable roller assembly to move relative to the fixed roller assembly.

[0021] Preferably, the rotational speed of the third gear at any time is defined as n3, and the ratio of the rotational speed of the third gear to the lifting speed of the lifting rod mechanism is a constant value S. Thus, the lifting speed of the lifting rod mechanism at this moment is n3S;

[0022] Define the rotation speed of the fourth gear at this moment as n4, and the lead of the take-up screw as L, so the speed of the movable roller assembly at this moment is n4L;

[0023] Define the number of layers of cable wound on the movable roller assembly as m, and the cable retraction and release speed at this moment is 2mn4L;

[0024] When the lifting speed of the lifting rod mechanism and the speed of the cable retracting and releasing mechanism are equal at any time, it can be obtained that n3S=2mn4L;

[0025] After sorting, we can get n3:n4=2mL / S.

[0026] Preferably, the top rod body extends outward to form a cable clamp for clamping the cable; and / or

[0027] There are multiple cables located on the same layer, and the multiple cables are braided into a row and then wound around the fixed roller assembly and the movable roller assembly.

[0028] Compared to existing technologies, the present invention offers the following advantages: The transmission assembly and linkage assembly work together, with the transmission assembly driving the entire lifter mechanism to complete the ascent or descent. The linkage assembly enables the cable take-up mechanism to operate synchronously with the lifter mechanism, achieving timely cable retraction and release. This ensures that the lifter mechanism's ascent and descent speeds are consistent with the cable take-up mechanism's operating speeds, avoiding problems caused by speed discrepancies, such as excessively loose or tight cables, and reducing the load on the cables during the raising and lowering process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural diagram of a lifting rod in the prior art;

[0030] Figure 2 It is a structural diagram of a spring cable in the prior art;

[0031] Figure 3 This is a schematic diagram of the installation structure of the spring cable;

[0032] Figure 4 This is a structural diagram of an embodiment of the present invention;

[0033] Figure 5 This is another structural diagram of an embodiment of the present invention;

[0034] Figure 6 It is a structural diagram of a transmission assembly in the prior art;

[0035] Figure 7 This is a schematic structural diagram of a transmission assembly in one embodiment of the present utility model;

[0036] Figure 8 This is a schematic structural diagram of a movable roller assembly in one embodiment of the present utility model;

[0037] Figure 9 This is a front view of a lifting device in one embodiment of the present utility model;

[0038] Figure 10 for Figure 9 A partial enlarged view of point A in the middle;

[0039] Figure 11 Schematic diagram of the structure of the wire take-up mechanism in one embodiment of the present invention.

[0040] In the picture:

[0041] 1. Lifting rod; 2. Take-up wheel; 3. Connector; 4. Cable; 5. Spring cable; 6. Rod body; 7. Fixed roller assembly; 701. Fixed plate; 702. Roller; 703. Support stick; 704. Guard plate; 8. Moving roller assembly; 9. Transmission assembly; 901. First gear; 902. Second gear; 903. Third gear; 904. Fourth gear; 10. Lifting screw; 11. Take-up screw. DETAILED DESCRIPTION

[0042] It should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," etc. should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0043] The following will be combined with the Figure 1-11 , the utility model is further explained.

[0044] In an embodiment of the present utility model, the lifting device includes:

[0045] The lifting rod mechanism includes a plurality of rod bodies 6 connected in sequence along the vertical direction, wherein the plurality of rod bodies 6 include a top rod body 6 provided at the top, a bottom rod body 6 provided at the bottom, and at least one middle rod body 6 provided between the top rod body 6 and the bottom rod body 6. The top rod body 6 and / or the middle rod body 6 can be raised and lowered relative to the bottom rod body 6.

[0046] The wire-taking mechanism is independently arranged on one side of the lifting rod assembly. The wire-taking mechanism includes a fixed roller assembly 7 and a movable roller assembly 8 that are arranged opposite to each other in the vertical direction and can move relative to each other in the vertical direction. One end of the cable 4 is fixed to the top rod body 6, and the other end is alternately wound around the fixed roller assembly 7 and the movable roller assembly 8 from the outside to the inside layer by layer before being fixed to the bottom rod body 6.

[0047] The driving mechanism includes a transmission assembly 9 and a linkage assembly connected to each other, wherein the transmission assembly 9 is used to drive the lifting rod mechanism to move up and down, and drives the take-up mechanism to retract and release the cable 4 through the linkage assembly;

[0048] The lifting speed of the lifting rod mechanism is equal to the speed of the cable retracting and releasing mechanism.

[0049] In this embodiment, the lifting rod mechanism is composed of a plurality of rod bodies 6, which are connected in sequence along the vertical direction. The rod bodies 6 are divided into a top rod body 6 (located at the top), a bottom rod body 6 (located at the bottom) and at least one middle rod body 6 (located between the top and bottom layers). The top rod body 6 and the middle rod body 6 can be lifted and lowered relative to the bottom rod body 6. The take-up mechanism is independently arranged on one side of the lifting rod mechanism. The lifting mechanism includes a fixed roller assembly 7 and a movable roller assembly 8. The fixed roller assembly 7 and the movable roller assembly 8 are relatively arranged in the up and down directions. The movable roller assembly 8 has a moving state close to or away from the fixed roller. The rod body 6, the fixed roller assembly 7 and the movable roller assembly 8 cooperate to form a conductor path of the cable 4. Specifically, one end of the cable 4 is fixed to the top rod body 6, and the other end is wound through the fixed roller assembly 7 and the movable roller assembly 8 in a layer-by-layer alternating manner and is finally fixed to the bottom rod body 6. When the lifting rod mechanism rises, one end of the cable 4 moves upward with the top rod body 6, and drives the part of the cable 4 wound around the fixed roller assembly 7 and the movable roller assembly 8 to move with the top The top rod body 6 gradually extends upward, and the length of the cable 4 between the fixed roller assembly 7 and the movable roller assembly 8 gradually becomes shorter. Therefore, the movable roller assembly 8 extends as the cable 4 extends upward, and gradually approaches the fixed roller assembly 7. The length of the cable 4 between the two gradually becomes shorter as the top rod body 6 rises, until the movable roller assembly 8 abuts against the fixed roller assembly 7, that is, the highest rising height of the rod body 6 is reached; conversely, when the lifting mechanism descends, one end of the cable 4 moves downward together with the top rod body 6, and the movable roller assembly 8 moves downward at this time, The downward moving cable 4 is rewound between the fixed roller assembly 7 and the movable roller assembly 8; at the same time, the driving assembly includes a transmission assembly 9 and a linkage assembly connected thereto, the transmission assembly 9 is used to drive the lifting rod mechanism to lift and lower, and drive the take-up mechanism to retract and release the cable 4 through the linkage assembly, and the linkage assembly enables the take-up mechanism to work synchronously with the movement of the lifting rod mechanism, thereby realizing timely retraction and release of the cable 4, ensuring that the lifting and lowering rate of the lifting rod mechanism is consistent with the operating rate of the take-up mechanism on the cable 4, avoiding problems caused by speed differences, such as the cable 4 being too loose or too tight.

[0050] The fixed roller assembly 7 and the movable roller assembly 8 include:

[0051] The two fixing plates 701 are spaced apart and relatively fixed via a connecting shaft.

[0052] Multiple roller groups are arranged at intervals from the outside to the inside, and a storage area for the cable 4 to pass through is constructed therebetween. Each roller group is a plurality of rollers 702 arranged in a semicircle at equal intervals. The rollers 702 are rotatably arranged between the two fixed plates 701.

[0053] In this embodiment, the two fixed plates 701 are arranged at intervals and are relatively fixed by a connecting shaft, and the connecting shaft ensures that the relative position between the two is stable. Multiple roller groups are arranged in sequence from the outside to the inside, and a receiving area for accommodating the cable 4 is formed between each roller group, which is used to guide the cable 4 to pass through in an orderly manner during the winding and releasing process to prevent the cable 4 from being entangled or damaged. Each roller group is composed of multiple rollers 702, and these rollers 702 are arranged in a semicircle with equal spacing, which helps to evenly disperse the force and ensure that the cable 4 moves smoothly during the retraction and release process. All rollers 702 are installed between the two fixed plates 701 and are allowed to rotate freely to adapt to the friction generated by the movement of the cable 4 without getting stuck.

[0054] The plurality of roller groups are equidistantly expanded outward with the axis of the connecting shaft as the center.

[0055] In this embodiment, all roller groups are radially distributed around the central axis of the connecting shaft, and each roller group expands outward at the same distance from the adjacent roller group. This design ensures that the cable 4 can be evenly distributed on different roller groups during the winding process. Since the roller groups are arranged at equal intervals, it helps to evenly distribute the weight of the cable 4 to each roller, reduce pressure concentration at a single location, and improve stability and durability.

[0056] A plurality of supporting rods 703 are provided between the two fixing plates 701 , and the plurality of supporting rods 703 are passed through the plurality of rollers in a one-to-one correspondence.

[0057] In this embodiment, a plurality of support sticks 703 are provided between the two fixed plates 701. The main function of these support sticks 703 is to provide additional support points for the rollers to ensure that the rollers can rotate freely and stably. Each support stick 703 passes through a roller, that is, each roller has a corresponding support stick 703 to support it. The advantage of this design is that it can ensure that each roller 702 can rotate independently and smoothly, while increasing the structural strength and stability of the entire take-up mechanism.

[0058] At least one of the two fixing plates 701 is provided with a guard plate 704 , and the guard plate 704 is located in the accommodating area.

[0059] In this embodiment, a guard plate 704 is provided on at least one of the two fixed plates 701. The guard plate 704 is located in the accommodating area, that is, the space through which the cable 4 passes. The guard plate 704 can prevent external objects or impurities from entering the space between the roller groups, thereby avoiding damage or interference to the cable 4. At the same time, the guard plate 704 cooperates with the roller 702 to better guide the cable 4 to move along a predetermined path, ensuring that the cable 4 can be correctly wound and released, and reducing the possibility of the cable 4 being confused or tangled.

[0060] The transmission assembly 9 includes:

[0061] A gear set, comprising a first gear 901, a second gear 902 and a third gear 903 meshing in sequence, wherein the first gear 901 is driven by a motor;

[0062] The lifting screw 10 is arranged on the third gear 903 along the up-down direction. The lifting screw 10 extends into the rod body 6 to drive the lifting rod assembly to move up and down.

[0063] In this embodiment, the transmission assembly 9 includes a first gear 901, a second gear 902, and a third gear 903 that are meshed in sequence. The first gear 901 is driven by a motor to link the second gear 902 and the third gear 903 to rotate synchronously. The lifting screw 10 is arranged on the third gear 903 along the vertical direction. The lifting screw 10 extends into the rod body 6 to drive the lifting rod assembly to move up and down. Further, the linkage assembly includes: a fourth gear 904 that is meshed with the third gear 903; a wire take-up screw 11 that is arranged on the fourth gear 904 along the vertical direction. The wire take-up screw 11 is connected to the movable roller assembly 8 to drive the movable roller assembly 8 to move relative to the fixed roller assembly 7. The fourth gear 904 is meshed with the third gear 903. The wire take-up screw 11 is arranged on the fourth gear 904 and connected to the movable roller assembly 8 to drive the movable roller assembly 8 to move relative to the fixed roller assembly 7. In order to achieve the coordination between the transmission assembly 9 and the linkage assembly, it is necessary to design a reasonable transmission between the third gear 903 and the fourth gear 904. Specifically, assuming that the working speed of the third gear 903 is 100r / min, the ratio of the speed of the third gear 903 to the lifting / lowering speed of the lifting rod is a constant value of 20mm / r, and the lifting / lowering speed of the lifting rod is 2000mm / min. The number of winding layers on the movable roller combination is designed to be 2. To ensure synchronization, 4n4L=2000, that is, n4L=500. The lead of the take-up screw 11 is designed to be 10mm, then n4=50r / min. A suitable fourth gear 904 is designed to make the transmission ratio of the fourth gear 904 to the third gear 903 0.5, and the speed of the fourth gear 904 is 50r / min to achieve synchronous retraction and release of the cable 4.

[0064] The rotation speed of the third gear 903 at any time is defined as n3. The ratio of the rotation speed of the third gear 903 to the lifting speed of the lifting rod mechanism is a constant value S. Therefore, the lifting speed of the lifting rod mechanism at this time is n3S.

[0065] Define the rotation speed of the fourth gear 904 at this moment as n4, and the lead of the take-up screw 11 as L, so the speed of the movable roller assembly 8 at this moment is n4L;

[0066] Define the number of layers of the cable 4 wound on the movable roller assembly 8 as m, and it can be obtained that the retraction and extension speed of the cable 4 at this moment is 2mn4L;

[0067] When the lifting speed of the lifting rod mechanism and the speed of the cable retracting and releasing mechanism are equal at any time, it can be obtained that n3S=2mn4L;

[0068] After sorting, we can get n3:n4=2mL / S.

[0069] In this embodiment, during normal operation of the lifting rod, the ratio of its ascent or descent speed to the rotational speed of the third gear 903 in the lifting rod transmission assembly 9 is a constant. Assuming the rotational speed of the third gear 903 at any given moment is n3, and the ratio of the rotational speed of the third gear 903 to the lifting rod ascent / descent speed is a constant S, the lifting rod ascent / descent speed at that moment is n3S. Through gear ratio design, the rotational speed of the fourth gear 904 is designed to be n4, and the lead of the take-up screw 11 is designed to be L. Driven by the take-up screw 11, the movable roller assembly moves linearly upward or downward (when the lifting rod rises, the movable roller assembly moves upward to automatically pay out the line, and vice versa, it moves downward to automatically take up the line). The speed at that moment is n4L. Assuming the number of layers of cable 4 wrapped around the movable roller assembly is m, the speed of the cable 4 being paid out or taken up (paying out when the lifting rod rises, taking up when the lifting rod descends) at that moment is 2mn4L (a movable roller assembly with m layers of winding can be understood as a movable pulley set with m movable pulleys). Because the upper portion of the cable 4 is relatively fixed to the top rod body 6 of the lifting rod, when the lifting rod's raising / lowering speed and the cable 4's releasing / retracting speed are equal at any time, that is, when n3S = 2mn4L, the synchronous retraction and release function is achieved. The "synchronous" in the synchronous retraction and release function is further explained: as long as the formula n3S = 2mn4L is satisfied at any time, the synchronous retraction and release function is achieved. This formula is transformed into n3:n4 = 2mL / S. After the entire system is designed, the number of cable 4 winding layers m, the lead L of the retraction mechanism, and the ratio S of the lifting rod's raising / lowering speed and the transmission structure are all fixed values. The ratio n3 to n4, that is, the transmission ratio of the third gear 903 to the fourth gear 904, is also a fixed value. Therefore, once the design satisfies n3S = 2mn4L, this formula holds true at any time, and the synchronous retraction and release function of the cable 4 is achieved.

[0070] The top rod body 6 extends outward to form a cable 4 clamp for clamping the cable 4; there are multiple cables 4 located on the same layer, and the multiple cables 4 are braided into rows and then wound around the fixed roller assembly 7 and the movable roller assembly 8.

[0071] In this embodiment, a cable 4 clamp extending outward is provided on the top rod body 6 for fixing one end of the cable 4 to ensure that the cable 4 does not loosen or move during the lifting process. If there are too many cables 4, the cables 4 can be braided into rows and then wound so that the multiple cables 4 have the smallest bending radius, thereby reducing the radial size of the roller combination.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A lifting device, characterized in that: include: The lifting rod mechanism includes a plurality of rods connected in sequence in an up-down direction, wherein the plurality of rods include a top rod at the top, a bottom rod at the bottom, and at least one middle rod between the top rod and the bottom rod, and the top rod and / or the middle rod can be raised and lowered relative to the bottom rod; A wire take-up mechanism is independently provided on one side of the lifting rod mechanism, and the wire take-up mechanism includes a fixed roller assembly and a movable roller assembly that are arranged opposite to each other in the vertical direction and can move relative to each other in the vertical direction. One end of the cable is fixed to the top rod body, and the other end of the cable is alternately wound around the fixed roller assembly and the movable roller assembly from the outside to the inside layer by layer, and then fixed to the bottom rod body; The driving mechanism includes a transmission assembly and a linkage assembly connected to each other, wherein the transmission assembly is used to drive the lifting rod mechanism to move up and down, and drives the take-up mechanism to retract and release the cable through the linkage assembly; Wherein, the lifting speed of the lifting rod mechanism is equal to the speed of the cable retracting and releasing of the cable by the cable retracting mechanism.

2. A lifting device according to claim 1, characterized in that: The fixed roller assembly and / or the movable roller assembly comprises: The two fixed plates are spaced apart and relatively fixed via a connecting shaft; A plurality of roller groups are arranged at intervals from the outside to the inside, and a receiving area for the cable to pass through is constructed therebetween. Each roller group comprises a plurality of rollers arranged in a semicircle at equal intervals, and the rollers are rotatably arranged between the two fixed plates.

3. A lifting device according to claim 2, characterized in that: The plurality of roller groups are equidistantly expanded outward with the axis of the connecting shaft as the center.

4. A lifting device according to claim 2 or 3, characterized in that: A plurality of supporting rods are provided between the two fixing plates, and the plurality of supporting rods are passed through the plurality of rollers in a one-to-one correspondence.

5. The lifting device according to claim 2, characterized in that: At least one of the two fixing plates is provided with a guard plate, and the guard plate is located in the accommodating area.

6. A lifting device according to claim 1, characterized in that: The transmission assembly comprises: a gear set comprising a first gear, a second gear and a third gear meshed in sequence, wherein the first gear is driven by a motor; A lifting screw rod is arranged on the third gear along the up-down direction, and the lifting screw rod extends into the rod body to drive the lifting rod mechanism to move up and down.

7. A lifting device according to claim 6, characterized in that: The linkage component includes: a fourth gear meshing with the third gear; The wire take-up screw rod is arranged on the fourth gear along the up-down direction. The wire take-up screw rod is connected to the movable roller assembly and is used to drive the movable roller assembly to move relative to the fixed roller assembly.

8. A lifting device according to claim 7, characterized in that: Define the rotation speed of the third gear at any time as n3, and the ratio of the rotation speed of the third gear to the lifting speed of the lifting rod mechanism as a constant value S. It can be obtained that the lifting speed of the lifting rod mechanism at this time is n3S; Define the rotation speed of the fourth gear at this moment as n4, and the lead of the take-up screw as L, so the speed of the movable roller assembly at this moment is n4L; Define the number of layers of cable wound on the movable roller assembly as m, and the cable retraction and release speed at this moment is 2mn4L; When the lifting speed of the lifting rod mechanism and the speed of the cable retracting and releasing mechanism are equal at any time, it can be obtained that n3S=2mn4L; After sorting, we can get n3:n4=2mL / S.

9. A lifting device according to claim 1, characterized in that: The top rod body extends outward to form a cable clamp for clamping the cable; and / or There are multiple cables located on the same layer, and the multiple cables are braided into a row and then wound around the fixed roller assembly and the movable roller assembly.

Images