Lifting column and electric standing desk

Abstract

The present invention relates to the field of linear actuators, and disclosed are a lifting column and an electric standing desk, which solve the problem of an excessive shaking amplitude of a spiral cable in the lifting column being prone to generating noise. According to the technical solution for solving the problem, mainly, an actuator drives, by mean of a transmission assembly, a nested pipe assembly to extend and retract. A spiral cable is arranged side by side with the transmission assembly on one side of the transmission assembly, one end of a middle pipe is provided with a first fixed seat, one end of an inner pipe is provided with a second fixed seat, and the transmission assembly comprises a first telescopic component, a second telescopic component connected to the first fixed seat, and a third telescopic component connected to the second fixed seat. The second telescopic component is in transmission connection with the first telescopic component, the third telescopic component is in transmission connection with the second telescopic component, and at least one of the first fixed seat and the second fixed seat is provided with a limiting hole for limiting the spiral cable in the radial direction, the spiral cable traversing the limiting hole. The present invention is mainly used for reducing noise.

Description

Lifting column and electric lifting table Technical Field

[0001] The present invention relates to the field of linear actuators, in particular to a lifting column and an electric lifting table. Background Art

[0002] Lifting columns are commonly used components in linear drive systems, widely used in devices such as electric lift tables and electric lift beds. For example, an electric lift table consists of a tabletop, a crossbeam located below it, and two lifting columns. The crossbeam is equipped with a controller, which is electrically connected to the motors on the two lifting columns to power and control their operation. Typically, the crossbeam is equipped with a power port for connecting to the power grid. As the tabletop moves up and down, the cables connected to the power port also move with it, making the space around the electric lift table rather cluttered.

[0003] In order to solve the above-mentioned problems, existing electric lift tables have cables arranged inside the lifting columns for concealment. The cables arranged in the lifting columns can be extended and retracted as the lifting columns are extended and retracted to maintain power supply to electrical equipment. For example, the prior art CN108272227A discloses a lift table with a hidden cable design, which includes a table top; at least one table column connected to the table top and including a telescopic sleeve structure; at least one drive module, the drive module includes a motor, a first screw and a socket, wherein the first screw and the socket are arranged in the telescopic sleeve structure, the first screw is screwed on one end of the socket, and the motor drives the first screw to screw in or out of the socket to change the length of the telescopic sleeve structure; a control module, the control module includes at least one circuit and a control interface, wherein the circuit is arranged in the telescopic sleeve structure and spirally wound around the circumference of the socket, and transmits electrical energy to drive the drive module; and a communication unit, the control interface sends a control signal to the motor through the communication unit, thereby driving at least one drive module. In this prior art, the line is spirally wound around the circumference of the socket. When the telescopic sleeve structure is extended or retracted, the line will be stretched or compressed around the periphery of the socket. In particular, after the spirally wound line is stretched, its diameter becomes smaller, which is prone to friction with the telescopic sleeve structure. After long-term use, the insulation layer of the line is easily damaged, and contact with the metal telescopic sleeve structure may cause leakage, posing a major safety hazard. At the same time, since it needs to be wound around the circumference of the socket, it is not convenient to assemble, disassemble and replace.

[0004] Therefore, prior art CN219069691U discloses a lifting column in which the wiring is located on one side of a telescopic sleeve structure, and the wiring is located within a network cable protective sheath. This prior art arranges the wiring and the telescopic sleeve structure side by side. However, in actual use, the retractable wiring has a certain length and is flexible and easily deformed. This easily causes radial shaking when the telescopic sleeve structure is extended or retracted. This can cause collision with the telescopic sleeve structure on the lifting column during the extension and retraction process, generating noise and affecting the user experience.

[0005] Summary of the Invention

[0006] The purpose to be achieved by the present invention is to provide a lifting column to solve the problem that the spiral cable in the lifting column shakes too much and easily generates noise, thereby reducing noise.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a lifting column, including a driver, a transmission assembly, a sleeve assembly and a spiral cable axially passing through the sleeve assembly, the driver drives the sleeve assembly to extend and retract through the transmission assembly, the spiral cables are arranged side by side on one side of the transmission assembly, the sleeve assembly includes an inner tube, a middle tube slidably sleeved outside the inner tube and an outer tube slidably sleeved outside the middle tube, one end of the middle tube is provided with a first fixed seat, one end of the inner tube is provided with a second fixed seat, the transmission assembly includes a first telescopic component, a second telescopic component connected to the first fixed seat and a third telescopic component connected to the second fixed seat, the second telescopic component is connected to the first telescopic component for transmission, and the third telescopic component is connected to the second telescopic component for transmission, at least one of the first fixed seat and the second fixed seat is provided with a limiting hole for radially limiting the spiral cable, and the spiral cable passes through the limiting hole.

[0008] After adopting the above technical solution, the present invention has the following advantages: at least one of the first fixing seat and the second fixing seat is provided with a limiting hole for radially limiting the spiral cable, and the radial movement range of the spiral cable located in the limiting hole is limited within the limiting hole, and the two ends of the spiral cable are fixed to the two ends of the lifting column, and the limiting hole is used to radially limit the middle part of the spiral cable, which is equivalent to dividing the spiral cable into at least two sections in length. The length of each section of the spiral cable becomes shorter, the structural strength will increase accordingly, and the deflection will decrease. Since the first fixing seat and the second fixing seat will produce axial displacement with the extension and contraction of the transmission assembly, that is, the limiting hole and the spiral cable passing through the limiting hole will synchronously displace axially, the limiting hole will always keep the spiral cable in a segmented state during the axial displacement process, thereby limiting the shaking amplitude of the spiral cable during the extension and contraction process. The limiting hole limits the shaking amplitude of the spiral cable to a smaller range, ensuring that the spiral cable will not shake excessively during the extension and contraction process and collide with the sleeve assembly, thereby effectively reducing the generation of noise, reducing the noise during the use of the lifting column, and improving the user experience. In addition, since the spiral cable only passes through the limiting hole and is not fixed to the first fixing seat or the second fixing seat, the spiral cable does not need to be additionally fixed or pulled by other components, and the spiral cable can still maintain free expansion and contraction. Therefore, it is not required that the length expansion and contraction change speed of the spiral cable be the same as the axial displacement speed of the limiting hole, which will not cause inconsistent expansion and contraction amplitudes of spiral cables in different sections. Ensuring that the expansion and contraction amplitudes of the spiral cables are evenly distributed is also beneficial to extending the service life of the spiral cables. The tensioning degrees of the spiral cables in different sections remain consistent. For example, the resistance to the transmission component increases gently during the extension process, which will not cause a sudden load change in the driver and is also beneficial to extending the service life of the driver.

[0009] In addition, the radial limitation of the spiral cable by the limiting hole changes dynamically with the lifting and lowering movement of the lifting column, and the limiting hole and the spiral cable will undergo relative displacement. Even during the movement of the lifting column, the shaking amplitude of the part of the spiral cable that is not limited by the limiting hole exceeds the limiting range of the limiting hole, causing the spiral cable to scrape the first fixing seat or the second fixing seat around the limiting hole. However, since the spiral cable is flexible, the spiral cable will be forcibly constrained by the limiting hole when passing through the limiting hole, thereby reducing the shaking amplitude, thereby reducing the overall shaking amplitude of the spiral cable.

[0010] Furthermore, the first fixing base includes a first mounting portion and a first limiting portion arranged side by side in a transverse manner. The second telescopic member is fixed to the first mounting portion, and the limiting hole is provided in the first limiting portion. Adopting the aforementioned technical solution, the limiting hole is provided in the first limiting portion, so that the spiral cable passing through the first limiting portion and the transmission assembly are arranged side by side. This ensures that the axial telescopic movement of the spiral cable and the transmission assembly do not affect each other, and also facilitates the assembly of the spiral cable, thereby improving the assembly efficiency of the lifting column.

[0011] Furthermore, the second telescopic component includes a second screw and a first transmission nut. The second screw is mounted on the first mounting portion via a fixed bearing and cooperates with the third telescopic component. The first transmission nut is fixed to the first mounting portion and cooperates with the first telescopic component. Using the aforementioned technical solution, the second screw and the fixed bearing cooperate to allow the second screw to rotate synchronously with the first screw while being stably fixed to the first mounting portion. This reduces friction while ensuring transmission stability, improves transmission efficiency, and ensures a smoother lifting column. The second screw cooperates with the third telescopic component, allowing the third telescopic component to perform linear telescopic motion on the second screw.

[0012] When the first telescopic component rotates, it can drive the first transmission nut and the first telescopic component to undergo relative displacement. The first transmission nut is fixed to the first fixed seat, so when the first telescopic component rotates, it drives the first fixed seat to perform linear motion. The relative displacement of the first fixed seat relative to the first telescopic component is temporarily set as L1; at the same time, when the first telescopic component rotates, it will drive the second screw rod to rotate synchronously. When the second screw rod rotates, it will drive the second transmission nut and the second screw rod to undergo relative displacement. Since the second transmission nut is connected to the second fixed seat, it is equivalent to the relative displacement of the second screw rod and the second fixed seat. The relative displacement of the second screw rod and the second fixed seat is temporarily set as L2. Since the second screw rod and the first transmission nut are axially positioned in a rotatable manner, the axial positioning in a rotatable manner means that only rotation occurs between the second screw rod and the first transmission nut, but no axial movement occurs. Therefore, it means that the second screw rod and the first fixed seat are relatively fixed in the axial direction. Therefore, from the overall point of view, when the first telescopic component rotates, the relative displacement between the second fixed seat and the first telescopic component is L1+L2. Compared with the traditional single transmission nut, such a structural design has the same premise that the first telescopic component rotates one circle. The displacement of the second fixed seat is greater, and the displacement of the inner tube is greater. Therefore, per unit time, the inner tube rises and falls faster, that is, the lifting speed of the lifting column is faster. Combined with the fact that the spiral cable only passes through the limiting hole and is not fixed on the first fixed seat or the second fixed seat, it further avoids the spiral cable from being pulled, thereby ensuring the smoothness of the rapid lifting movement of the lifting column.

[0013] Furthermore, the first fixing seat is assembled from a first portion and a second portion, which clamp and fix the bearing and the first drive nut. Both the first portion and the second portion are provided with grooves and assembled to form a stopper hole. Using the aforementioned technical solution, the first fixing seat is assembled from the first portion and the second portion, making it easier to install the fixed bearing and the first drive nut on the first fixing seat, facilitating production, assembly, disassembly, and maintenance, while providing greater flexibility. The first and second portions clamp and fix the bearing and the first drive nut, ensuring that the fixed bearing and the first drive nut are stably secured within the first fixing seat. When the first drive nut performs linear telescopic motion on the first screw, the first drive nut stably drives the first fixing seat and the second screw fixed to the first fixing seat to telescope, ensuring the stability of the lifting column during extension and retraction, and effectively preventing the fixed bearing and the first drive nut from shaking and affecting the telescopic motion of the lifting column. The grooves in both the first and second portions facilitate the design of the first and second portions into identical structures, enabling processing using a single mold. During assembly, there is no need to distinguish between the first and second portions; simply flipping one portion over and docking it with the other completes assembly, reducing production costs and improving assembly efficiency.

[0014] Furthermore, the outer periphery of the first mounting portion and the first limiting portion is matingly connected to the inner wall of the middle tube. The aforementioned technical solution ensures the reliability of the connection between the first mounting portion and the first limiting portion and the middle tube, which helps to stabilize the position of the first fixing seat relative to the middle tube and prevent it from loosening, ensuring that the first fixing seat can reliably drive the middle tube to extend and retract when the lifting column is extended or retracted.

[0015] Furthermore, the second fixing seat includes a second mounting portion and a second limiting portion arranged side by side in a transverse direction, the third telescopic component is fixed to the second mounting portion, and the limiting hole is provided in the second limiting portion. Using the aforementioned technical solution, the limiting hole is provided in the second limiting portion, so that the spiral cable passing through the second limiting portion is arranged side by side with the transmission assembly, ensuring that the axial telescopic movement between the spiral cable and the transmission assembly does not affect each other, while also facilitating the assembly of the spiral cable, which is beneficial to improving the assembly efficiency of the lifting column. At the same time, the limiting hole limits the swing amplitude of the spiral cable, making it less likely to collide with the sleeve assembly and generate noise. The third telescopic component is fixed to the second mounting portion. When the second mounting portion axially telescopically moves, it drives the third telescopic component to telescope synchronously, which is beneficial to improving the telescopic efficiency.

[0016] Furthermore, the second fixing seat is integrally formed, the limiting hole longitudinally passes through the second limiting portion, and the outer periphery of the second fixing seat is connected in a cooperative manner with the inner wall of the inner tube. Adopting the above-mentioned technical solution, the integral formation of the second fixing seat can simplify the manufacturing process, reduce the number of parts required for installation, facilitate rapid assembly, improve production efficiency, and reduce product time costs. The outer periphery of the second fixing seat is connected in a cooperative manner with the inner wall of the inner tube, ensuring the reliability of the connection between the second fixing seat and the inner tube, making the position of the second fixing seat relative to the inner tube more stable and less likely to loosen, and ensuring that the second fixing seat can reliably drive the inner tube to move in a telescopic manner when the lifting column is extended or retracted.

[0017] Furthermore, both the first fixing seat and the second fixing seat are provided with limiting holes for radially limiting the spiral cable. The limiting holes of the first fixing seat and the limiting holes of the second fixing seat are spaced apart from each other to radially limit the spiral cable during the ascending process of the lifting column, and the spacing gradually increases. By adopting the above-mentioned technical solution, limiting holes are provided on both the first fixing seat and the second fixing seat, and the spiral cable can be divided into three shorter sections for radial limiting. Multiple limiting of the spiral cable can shorten the length of the spiral cable from the top of the spiral cable to the first fixing seat, from the first fixing seat to the second fixing seat, and from the second fixing seat to the bottom of the spiral cable, thereby better limiting the shaking of the spiral cable, enhancing the effect of the limiting holes on reducing the shaking amplitude of the spiral cable, and being more conducive to reducing noise.

[0018] As the lifting column ascends, the first mounting seat moves on the first screw, causing the middle tube to move upward. Simultaneously, the second screw rotates with it and engages with the second drive nut in the second mounting seat, driving the second mounting seat on the second screw, causing the inner tube to move upward. The spacing between the retaining holes in the first and second mounting seats gradually increases, and the spiral cable also extends along with the sleeve assembly, maintaining a three-section structure that helps minimize vibration.

[0019] Furthermore, the upper end of the spiral cable is connected to the driver, and the lower end of the spiral cable is connected to the junction box provided at the bottom of the lifting column. When the lifting column is in the extended state, the limiting hole of the first fixing seat is closer to the upper end of the spiral cable, and the limiting hole of the second fixing seat is closer to the lower end of the spiral cable. Using the above technical solution, a first power interface is provided on the junction box, which is electrically connected to the lower end of the spiral cable. The junction box can hide the part where the spiral cable is electrically connected to the first power interface, and the connection terminals of the two can be isolated from the transmission assembly and the sleeve assembly. The connection terminals of the spiral cable and the connection terminals of the first power interface will not contact the transmission assembly or the sleeve assembly, thereby preventing current from being transmitted to the transmission assembly or the sleeve assembly and causing leakage or sparks, thereby reducing the safety risks of the lifting column. The limiting hole of the first fixing seat is closer to the upper end of the spiral cable, and the limiting hole of the second fixing seat is closer to the lower end of the spiral cable. The upper end and the lower end of the spiral cable can serve as two existing limiting points of the spiral cable, and form four radial limiting points from top to bottom with the limiting hole of the first fixing seat and the limiting hole of the first fixing seat, namely the connection point where the spiral cable connects to the driver, the limiting hole on the first fixing seat, and the connection point where the limiting hole on the first fixing seat and the spiral cable connect to the junction box, forming a three-section limitation for the entire spiral cable, reducing the length of each section of the spiral cable, and the limiting hole of the first fixing seat is closer to the upper end of the spiral cable, and the limiting hole of the second fixing seat is closer to the lower end of the spiral cable, so that the length difference of each section of the spiral cable is reduced, ensuring that the radial limitation of the spiral cable is more uniform.

[0020] Furthermore, the inner tube is provided with a limiting sleeve that is sleeved on the outer circumference of the spiral cable, and the limiting sleeve separates the spiral cable in the inner tube from the transmission assembly. By adopting the above-mentioned technical solution, since the cross-section of the inner tube is small, the spiral cable in the inner tube is limited by the limiting sleeve, which can directly prevent the spiral cable from directly contacting the inner tube due to shaking during the extension and contraction process. If a collision occurs between the limiting sleeve and the spiral cable, since the radial spacing between the limiting sleeve and the spiral cable is short, the collision amplitude is small and it is difficult to generate a large noise. There is also an inner tube outside the limiting sleeve, which can also block the noise generated by the collision between the spiral cable and the limiting sleeve. Moreover, under the radial limitation of the limiting sleeve, the shaking amplitude of the spiral cable can be further reduced, which is conducive to further reducing noise.

[0021] Furthermore, both the first and second fixing seats are provided with limiting holes. When the lifting column is in the retracted state, the channel enclosed by the limiting sleeve, the limiting hole of the first fixing seat, and the limiting hole of the second fixing seat are connected and abutted, thereby enclosing at least the spiral portion of the spiral cable. With the above technical solution, in the retracted state, the channel enclosed by the limiting sleeve, the limiting hole of the first fixing seat, and the limiting hole of the second fixing seat are connected and abutted, thereby storing and protecting the spiral cable. Furthermore, the spiral cable is less likely to collide with the sleeve assembly during the movement of the lifting column.

[0022] Furthermore, an oil reservoir is provided in the inner tube, located below the transmission assembly and fixedly connected to the limiting sleeve or the inner tube. With this technical solution, when the lifting column operates at high speed or for extended periods of time, and the temperature of the space in which the lifting column is located is high, the grease on the transmission assembly becomes more fluid, causing it to drip downward into the reservoir, preventing it from slowly seeping out of the lifting column.

[0023] Furthermore, the outer tube, middle tube, and inner tube are arranged in sequence from top to bottom, the driver is installed above the outer tube, and the first telescopic component is connected to the output end of the driver for transmission. Using the aforementioned technical solution, when the lifting column is in an extended state, the middle tube is located between the outer tube and the inner tube; when the lifting column is in a retracted state, the middle tube is sleeved within the outer tube, and the inner tube is sleeved within the middle tube, making the structure of the lifting column more compact, convenient for transportation and installation, and providing the lifting column with better stability and structural strength, which can be better used for support and fixation. The driver is a motor box, which has a built-in motor and reducer that provide the power required for the transmission assembly to telescopic movement. The driver drives the first telescopic component to rotate, the first telescopic component transmits power to the second telescopic component, and the second telescopic component transmits power to the third telescopic component. Thus, the power of the driver can be transmitted to the first telescopic component, the second telescopic component, and the third telescopic component, so that the transmission assembly drives the sleeve assembly to extend and retract, ensuring transmission efficiency. The upright lifting column does not require a transmission sleeve to transmit power. The upright installation here refers to the telescopic sleeve structure disclosed in the prior art CN108272227A. Because the inverted structure simplifies the structure of the transmission assembly, the lifting column can meet the space requirements when the spiral cable and transmission assembly are arranged side by side.

[0024] Furthermore, the first telescopic component includes a first screw, the second telescopic component includes a second screw and a first transmission nut, and the third telescopic component includes a second transmission nut. The first screw passes through the first transmission nut and is inserted into the second screw. The first screw cooperates with the first transmission nut for transmission, the second screw cooperates with the first screw to rotate synchronously with the first screw, the second screw passes through the second transmission nut for transmission, the first transmission nut is fixed to the first fixed seat, and the second transmission nut is fixed to the second fixed seat. Using the above technical solution, with the outer tube as a reference, the driver drives the first screw to rotate, the first transmission nut cooperates with the first screw to transmit, and the rotational motion of the first screw is converted into linear telescopic motion of the first transmission nut, causing the first transmission nut to perform linear telescopic motion on the screw and drive the middle tube with the first fixed seat to telescope. That is, the first screw and the first transmission nut cooperate to drive the middle tube to telescope. As the first screw rotates, the second screw cooperates with the first screw to rotate synchronously with the first screw, causing the second transmission nut to perform linear telescopic motion on the second screw, and the second transmission nut drives the inner tube with the second fixed seat to telescope. That is, after the driver is activated, the middle and inner tubes simultaneously extend and retract to achieve axial lifting and lowering motion of the lifting column, which helps accelerate the lifting motion, reduces user waiting time, and improves the user experience. With the inner tube as a reference, the driver drives the first screw to rotate. The second screw, which cooperates with the first screw to rotate synchronously with the first screw, performs linear telescopic motion within the second drive nut. The second screw is fixed to the first fixed seat, that is, the second screw drives the middle tube, which is equipped with the first fixed seat, to telescope. The first screw cooperates with the first drive nut, causing the first screw to perform linear telescopic motion within the first drive nut, and drives the outer tube to telescope. That is, after the driver is activated, the middle and outer tubes simultaneously extend and retract to achieve axial lifting and lowering motion of the lifting column.

[0025] The present invention also provides an electric lift table comprising a table top, a controller, and a lifting column. The table top is fixed to the top of the lifting column, wherein the lifting column is any of the lifting columns described in the above technical solutions. The controller is electrically connected to a spiral cable. Electrical devices can be placed on the table top. Because the spiral cable is concealed within the lifting column, the external spiral cable does not become entangled with the power cords of the electrical devices on the table top, thereby preventing the power cords or external spiral cables from being pulled during the table top's raising or lowering. During use, the electric lift table generates minimal noise within the lifting column, which does not affect the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings:

[0027] FIG1 is a schematic diagram of a lifting column in a retracted state according to the present invention;

[0028] FIG2 is a schematic diagram of the lifting column in an extended state;

[0029] FIG3 is a cross-sectional view of the lifting column in a retracted state;

[0030] FIG4 is a cross-sectional view of the lifting column in an extended state;

[0031] Figure 5 is a schematic diagram of the internal structure of the lifting column (I);

[0032] FIG6 is a cross-sectional view of the internal structure of the lifting column;

[0033] Figure 7 is a schematic diagram of the internal structure of the lifting column (II);

[0034] FIG8 is an enlarged view of point A in FIG7 ;

[0035] FIG9 is a schematic structural diagram of a first fixing seat;

[0036] FIG10 is a schematic structural diagram of the second part;

[0037] FIG11 is a top view of the first fixing seat;

[0038] FIG12 is a schematic diagram of the cooperation between the first fixing seat and the transmission assembly;

[0039] FIG13 is a schematic structural diagram of a second fixing seat;

[0040] FIG14 is a cross-sectional view of the second fixing seat;

[0041] FIG15 is a schematic diagram of a junction box;

[0042] FIG16 is a schematic structural diagram of the limiting sleeve. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described 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, not all of the embodiments.

[0044] The terms "first," "second," and so on (if any) in the specification and claims of this invention are used to distinguish similar objects, not to describe a specific order or precedence. Even if "second" is used before a technical feature to distinguish it, it does not necessarily imply the presence of "first." It should be understood that, in this invention, "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. It should be understood that, in this invention, "plurality" refers to two or more. "And / or" is merely a description of an association between related objects, indicating that three possible relationships exist. For example, "X and / or Y" can mean: X exists alone, X and Y exist simultaneously, or Y exists alone. The character " / " generally indicates that the related objects are in an "or" relationship. "Including X, Y, and Z" means including all three of X, Y, and Z. "Including X, Y, or Z" means including one of X, Y, and Z. "Including X, Y, and / or Z" means including any one, any two, or any three of X, Y, and Z.

[0045] The following specific embodiments are used to describe the technical solution of the present invention in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0046] Example 1:

[0047] As shown in Figures 1 to 16, the present invention provides a lifting column, including a driver 1, a transmission assembly, a sleeve assembly and a spiral cable 4 axially passing through the sleeve assembly. The driver 1 drives the sleeve assembly to extend and retract through the transmission assembly. The spiral cable 4 is arranged side by side on one side of the transmission assembly. The sleeve assembly includes an inner tube 31, a middle tube 32 slidably sleeved outside the inner tube 31, and an outer tube 33 slidably sleeved outside the middle tube 32. One end of the middle tube 32 is provided with a first fixed seat 34, and one end of the inner tube 31 is provided with a second fixed seat 35. The transmission assembly includes a first telescopic component 21, a second telescopic component 22 connected to the first fixed seat 34, and a third telescopic component 23 connected to the second fixed seat 35. The second telescopic component 22 is connected to the first telescopic component 21 for transmission, and the third telescopic component 23 is connected to the second telescopic component 22 for transmission. A limiting hole 36 for radially limiting the spiral cable 4 is provided in the first fixed seat 34 and the second fixed seat 35, and the spiral cable 4 passes through the limiting hole 36.

[0048] In this embodiment, the spiral cable 4 is arranged side by side on one side of the transmission component. The spiral cable 4 can supply power to the transmission component. The spiral cable 4 is spiral and has multiple turns of cable. When the transmission component is extended, the pitch of the spiral cable 4 will increase and the whole will be extended. When the transmission component is shortened, the pitch of the spiral cable 4 will decrease and the whole will retract. Therefore, the spiral cable 4 can be extended and retracted as the transmission component is extended and retracted. After such a design, the spiral cable 4 can be built into the sleeve assembly, so that the spiral cable 4 can be routed from the inside of the lifting column without causing the mess caused by the exposure of the spiral cable 4, and the user will not be tripped by the spiral cable 4 when passing by.

[0049] A limiting hole 36 for radially limiting the spiral cable 4 is provided in the first fixing seat 34 and the second fixing seat 35. The limiting hole 36 can be provided on the first fixing seat 34, or the limiting hole 36 can be provided on the second fixing seat 35. The radial movement range of the spiral cable 4 located in the limiting hole 36 is limited within the limiting hole 36, and the two ends of the spiral cable 4 are fixed at the two ends of the lifting column, and the limiting hole 36 is used to radially limit the middle part of the spiral cable 4, which is equivalent to dividing the spiral cable 4 into at least two sections in length. The length of each section of the spiral cable 4 becomes shorter, the structural strength will increase accordingly, and the deflection will decrease. Since the first fixing seat 34 and the second fixing seat 35 will produce relative axial displacement as the transmission assembly is extended and retracted, that is, the limiting hole 36 and the spiral cable 4 passing through the limiting hole 36 will synchronously displace axially, the limiting hole 36 will always keep the spiral cable 4 in a segmented state during the axial displacement, thereby limiting the shaking amplitude of the spiral cable 4 during the extension and retraction process. The limiting hole 36 limits the shaking amplitude of the spiral cable 4 to a smaller range, ensuring that the spiral cable 4 will not shake excessively and collide with the sleeve assembly during the extension and retraction process, thereby effectively reducing the generation of noise, reducing the noise during the use of the lifting column, and improving the user experience.

[0050] In addition, since the spiral cable 4 only passes through the limiting hole 36 and is not fixed on the first fixing seat 34 or the second fixing seat 35, the spiral cable 4 does not need to be additionally fixed or pulled by other components, and the spiral cable 4 can still maintain free expansion and contraction. Therefore, it is not required that the length expansion and contraction change speed of the spiral cable 4 must be the same as the axial displacement speed of the limiting hole 36, which will not cause inconsistent expansion and contraction amplitudes of the spiral cables 4 in different sections. Ensuring that the expansion and contraction amplitudes of the spiral cables 4 are evenly distributed is also beneficial to extending the service life of the spiral cables 4. The tensioning degrees of the spiral cables 4 in different sections remain consistent. For example, the resistance to the transmission component increases gently during the elongation process, which will not cause a sudden load change of the driver 1, and is also beneficial to extending the service life of the driver 1.

[0051] In addition, the radial limitation of the spiral cable 4 by the limiting hole 36 changes dynamically with the lifting and lowering movement of the lifting column, and the limiting hole 36 and the spiral cable 4 will undergo relative displacement. Even during the movement of the lifting column, the shaking amplitude of the part of the spiral cable 4 that is not limited by the limiting hole 36 exceeds the limiting range of the limiting hole 36, causing the spiral cable 4 to scrape the first fixing seat 34 or the second fixing seat 35 around the limiting hole 36. However, since the spiral cable 4 is flexible, the spiral cable 4 will be forcibly constrained by the limiting hole 36 when passing through the limiting hole 36, thereby reducing the shaking amplitude, thereby reducing the overall shaking amplitude of the spiral cable 4.

[0052] In one embodiment, the hole wall of the limiting hole 36 gradually shrinks from the two open ends of the limiting hole 36 to the middle. The hole wall can be set to an arc surface or an inclined surface. The arc surface or the inclined surface has a guiding effect on the spiral cable 4, that is, the two open ends guide the spiral cable 4 into the limiting hole 36, and the spiral cable 4 is forced to be constrained to the middle of the limiting hole 36 by the hole wall, further reducing the shaking amplitude of the spiral cable.

[0053] In the prior art, the line is usually spirally wrapped around the circumference of the transmission component and directly connected between the upper and lower fixed points of the lifting column. Compared with the prior art, the spiral cable 4 in the present application is arranged side by side on one side of the transmission component and is radially limited through the limiting hole 36 to ensure that the axial expansion and contraction between the spiral cable 4 and the transmission component will not affect each other. In addition, compared with longer cables, the middle of the spiral cable 4 of the present application is limited, and the shaking amplitude of the cable will be smaller, so that the spiral cable 4 is not easy to collide with the sleeve assembly during the expansion and contraction of the sleeve assembly and generate noise. Even if a collision occurs, no obvious noise will be generated due to the small shaking amplitude of the spiral cable 4.

[0054] The concept of the present application is to allow a whole section of the spiral cable 4 to pass through the limiting hole 36 for radial positioning, so that the overall extension and contraction length of the spiral cable 4 remains unchanged while limiting the movement range of the spiral cable 4 to a certain area, thereby reducing the swing amplitude of the spiral cable 4. In addition to three-section columns, the solution of the present application can also be used for multi-section columns (at least more than two sections).

[0055] As shown in Figures 1 to 8, in one embodiment, an outer tube 33, a middle tube 32, and an inner tube 31 are arranged sequentially from top to bottom. The driver 1 is mounted above the outer tube 33, and the first telescopic component 21 is connected to the output end of the driver 1 for transmission. When the lifting column is in the extended state, the middle tube 32 is located between the outer tube 33 and the inner tube. When the lifting column is in the retracted state, the middle tube 32 is inserted into the outer tube 33, and the inner tube 31 is inserted into the middle tube 32. This makes the lifting column more compact, facilitating transportation and installation, and provides the lifting column with greater stability and structural strength, making it more suitable for support and fixation. The driver 1 is a motor box containing a motor and a reducer that provide the power required for the transmission assembly to extend and retract. The driver 1 drives the first telescopic component 21 to rotate, which then transmits power to the second telescopic component 22, which in turn transmits power to the third telescopic component 23. Thus, the power of the driver 1 is transmitted to the first, second, and third telescopic components 21, 22, 23, enabling the transmission assembly to drive the sleeve assembly to extend and retract, ensuring transmission efficiency. There is no need to use a transmission sleeve to transmit power as in the standard installation method. The so-called standard installation here refers to the installation method of the telescopic sleeve structure disclosed in the prior art CN108272227A. The inverted structure simplifies the structure of the transmission assembly, allowing the lifting column to meet the space requirements when the spiral cable 4 and the transmission assembly are arranged side by side.

[0056] Among them, the first telescopic component 21 includes a first screw rod 211, the second telescopic component 22 includes a second screw rod 221 and a first transmission nut 222, and the third telescopic component 23 includes a second transmission nut 231. The first screw rod 211 passes through the first transmission nut 222 and is inserted into the second screw rod 221. The first screw rod 211 cooperates with the first transmission nut 222 for transmission, and the second screw rod 221 cooperates with the first screw rod 211 to rotate synchronously with the first screw rod 211. The second screw rod 221 passes through the second transmission nut 231 for transmission. The first transmission nut 222 is fixed to the first fixed seat 34, and the second transmission nut 231 is fixed to the second fixed seat 35.

[0057] With the outer tube as a reference, the actuator 1 drives the first screw rod 211 to rotate. The first drive nut 222 cooperates with the first screw rod 211 to transmit the rotational motion of the first screw rod 211, converting the rotational motion of the first drive nut 222 into linear telescopic motion. This causes the first drive nut 222 to perform linear telescopic motion within the first screw rod 211, driving the middle tube 32, which is equipped with the first fixing seat 34, to telescope. Specifically, the first screw rod 211 and the first drive nut 222 cooperate to cause the middle tube 32 to telescope. As the first screw rod 211 rotates, the second screw rod 221, in conjunction with the first screw rod 211, rotates synchronously with it, causing the second drive nut 231 to perform linear telescopic motion within the second screw rod 221. This in turn drives the inner tube 31, which is equipped with the second fixing seat 35, to telescope. In other words, after the actuator 1 is actuated, the middle tube 32 and the inner tube 31 simultaneously telescope to achieve axial lifting and lowering motion of the lifting column, accelerating the lifting motion, reducing user waiting time, and improving the user experience.

[0058] With the inner tube as a reference, the actuator 1 drives the first screw rod 211 to rotate. The second screw rod 221, locked in place by the first screw rod 211, rotates synchronously with it. The second screw rod 221 performs linear telescopic motion within the second drive nut 231. The second screw rod 221 is fixed to the first fixing seat 34. This means that the second screw rod 221 drives the middle tube, which is mounted on the first fixing seat 34, to telescope. The first screw rod 211 cooperates with the first drive nut 222, causing the first screw rod 211 to perform linear telescopic motion within the first drive nut 222, driving the outer tube to telescope. In other words, when the actuator is actuated, the middle and outer tubes simultaneously telescope, achieving axial lifting and lowering motion of the lifting column.

[0059] When the first screw rod 211 rotates, it can drive the first transmission nut 222 and the first screw rod 211 to undergo relative displacement. The first transmission nut 222 is fixed to the first fixed seat 34. Therefore, when the first screw rod 211 rotates, it drives the first fixed seat 34 to perform linear motion. The relative displacement of the first fixed seat 34 relative to the first screw rod 211 is tentatively set to L1; at the same time, when the first screw rod 211 rotates, it will drive the second screw rod 221 to rotate synchronously. When the second screw rod 221 rotates, it will drive the second transmission nut 231 and the second screw rod 221 to undergo relative displacement. Since the second transmission nut 231 is connected to the second fixed seat 35, it is equivalent to the second screw rod 221 and the second fixed seat 35 undergoing relative displacement. The relative displacement of the second screw rod 221 and the second fixed seat 35 is tentatively set to L2. Since the second screw rod 221 and the first transmission nut 222 are axially positioned in a rotatable manner, the axial positioning in a rotatable manner means that only rotation occurs between the second screw rod 221 and the first transmission nut 222, but no axial movement occurs. Therefore, it means that the second screw rod 221 and the first fixing seat 34 are relatively fixed in the axial direction. Therefore, from the overall perspective, when the first screw rod 211 rotates, the relative displacement between the second fixing seat 35 and the first screw rod 211 is L1+L2. Compared with the traditional single transmission nut, such a structural design, under the premise that the first screw rod 211 rotates one circle, the displacement of the second fixing seat 35 in the present application is larger, and the displacement of the inner tube 31 is larger. Therefore, per unit time, the inner tube 31 rises and falls faster, that is, the lifting speed of the lifting column is faster. Combined with the fact that the spiral cable 4 only passes through the limiting hole 36 and is not fixed to the first fixing seat 34 or the second fixing seat 35, it further prevents the spiral cable 4 from being pulled, thereby ensuring the smoothness of the rapid lifting movement of the lifting column.

[0060] As shown in Figures 8 to 12, when the limiting hole 36 is provided on the first fixing seat 34, to facilitate the assembly of the spiral cable 4, in one embodiment, the first fixing seat 34 includes a first mounting portion 341 and a first limiting portion 342 arranged laterally side by side. The second telescopic member 22 is fixed to the first mounting portion 341, and the limiting hole 36 is provided in the first limiting portion 342. The limiting hole 36 is provided in the first limiting portion 342, so that the spiral cable 4 passing through the first limiting portion 342 is arranged side by side with the transmission assembly, ensuring that the axial telescopic movement between the spiral cable 4 and the transmission assembly does not affect each other. This also facilitates the assembly of the spiral cable 4 and improves the assembly efficiency of the lifting column.

[0061] The second telescopic component 22 is fixed to the first fixing seat 34 through the first mounting portion 341 , that is, the second telescopic component 22 can move axially relative to the first fixing seat 34 . The first fixing seat 34 is provided on the middle tube 32 , that is, the second telescopic component 22 moves telescopically along with the middle tube 32 .

[0062] As shown in Figure 8, the second screw rod 221 is mounted on the first mounting portion 341 via a fixed bearing 223 and cooperates with the third telescopic member 23. The first transmission nut 222 is fixed to the first mounting portion 341 and cooperates with the first telescopic member 21. The cooperation between the second screw rod 221 and the fixed bearing 223 allows the second screw rod 221 to rotate synchronously with the first screw rod 211 while being stably fixed to the first mounting portion 341. This reduces friction while ensuring transmission stability, improves transmission efficiency, and ensures a smoother lifting process for the lifting column. The second screw rod 221 cooperates with the third telescopic member 23, allowing the third telescopic member 23 to perform linear telescopic motion on the second screw rod 221.

[0063] To secure the fixed bearing 223 and the first drive nut 222 to the first fixing seat 34, in one embodiment, the first fixing seat 34 is assembled from a first portion 343 and a second portion 344. The first portion 343 and the second portion 344 clamp the fixed bearing 223 and the first drive nut 222. The first portion 343 and the second portion 344 are both provided with groove structures and assembled to form a limiting hole 36. The assembly of the first fixing seat 34 from the first portion 343 and the second portion 344 facilitates the installation of the fixed bearing 223 and the first drive nut 222 on the first fixing seat 34, facilitating production, assembly, and disassembly for maintenance, and providing greater flexibility. The first portion 343 and the second portion 344 clamp the fixed bearing 223 and the first transmission nut 222, so that the fixed bearing 223 and the first transmission nut 222 are stably fixed in the first fixed seat 34. When the first transmission nut 222 performs linear telescopic motion on the first screw rod 211, the first transmission nut 222 can stably drive the first fixed seat 34 and the second screw rod 221 fixed on the first fixed seat 34 to telescopic motion, thereby ensuring the stability of the lifting column during extension and retraction, and effectively preventing the fixed bearing 223 and the first transmission nut 222 from shaking and affecting the telescopic motion of the lifting column.

[0064] As shown in Figures 9 to 11, the first part 343 and the second part 344 are both provided with a groove structure, which makes it easy to design the first part and the second part into the same structure. The processing can be completed using a set of molds. There is no need to distinguish between the first part 343 and the second part 344 during assembly. One of them can be flipped over and docked with the other to complete the assembly, which is conducive to reducing production costs and improving assembly efficiency.

[0065] In order to stably connect the first fixing seat 34 to the middle tube 32, in one embodiment, the outer periphery of the first mounting portion 341 and the first limiting portion 342 are cooperatively connected with the inner wall of the middle tube 32, thereby ensuring the reliability of the connection between the first mounting portion 341 and the first limiting portion 342 and the middle tube 32, which is conducive to making the position of the first fixing seat 34 relative to the middle tube more stable and not easy to loosen, and ensuring that the first fixing seat 34 can reliably drive the middle tube to move when the lifting column is extended and retracted.

[0066] As shown in Figures 13 and 14, when the limiting hole 36 is provided on the second fixing base 35, in one embodiment, the second fixing base 35 includes a second mounting portion 351 and a second limiting portion 352 arranged side by side in a transverse direction. The third telescopic member 23 is fixed to the second mounting portion 351, and the limiting hole 36 is provided in the second limiting portion 352. The limiting hole 36 is provided in the second limiting portion 352, so that the spiral cable 4 passing through the second limiting portion 352 is arranged side by side with the transmission assembly. This ensures that the axial telescopic movement of the spiral cable 4 and the transmission assembly do not affect each other, and also facilitates the assembly of the spiral cable 4, thereby improving the assembly efficiency of the lifting column. The limiting hole 36 also limits the swing of the spiral cable 4, preventing it from colliding with the sleeve assembly and generating noise. The third telescopic member 23 is fixed to the second mounting portion 351. When the second mounting portion 351 moves axially, it drives the third telescopic member 23 to extend and retract synchronously, thereby improving telescopic efficiency.

[0067] To secure the second fixing seat 35 to the inner tube 31, in one embodiment, the second fixing seat 35 is integrally formed, with a limiting hole 36 extending longitudinally through the second limiting portion 352. The outer periphery of the second fixing seat 35 is engaged with the inner wall of the inner tube 31. During the extension and retraction of the lifting column, the second fixing seat 35 linearly reciprocates along with the second drive nut 231 on the second screw rod 221, engaging the outer periphery of the second fixing seat 35 with the inner wall of the inner tube 31. This ensures a reliable connection between the second fixing seat 35 and the inner tube 31, allowing the second fixing seat 35 to stably drive the inner tube 31 to extend and retract synchronously.

[0068] The second fixing base 35 is integrally formed to simplify the manufacturing process, reduce the number of parts required for assembly, facilitate rapid assembly, improve production efficiency, and reduce production time costs. Alternatively, the second fixing base 35 can be configured as a split assembly structure, which can be adjusted according to actual needs.

[0069] The first fixing seat 34 and the second fixing seat 35 can be configured as a rectangular block structure, the first mounting portion and the first limiting portion are arranged along the length direction of the rectangular block structure, and the second mounting portion and the second limiting portion are arranged along the length direction of the rectangular block structure. The first mounting portion, the first limiting portion, the second mounting portion and the second limiting portion can all be configured as circular holes. The longitudinal edge of the first fixing seat 34 is provided with a notch for mounting and fixing the first fixing seat 34 within the sleeve assembly. The side of the first fixing seat 34 is provided with a raised grid structure for clamping and fixing with the inner wall of the middle tube. A connecting hole and a connecting column are provided on the side where the first part and the second part are connected, and the connecting hole and the connecting column cooperate to assemble and connect the first part and the second part.

[0070] The second transmission nut is fixed in the second mounting portion. A card interface is provided at a side corner of the second fixing seat 35 , and the card interface cooperates with the inner tube to achieve connection and fixation.

[0071] Example 2:

[0072] As shown in Figures 2 to 16, in this embodiment, both the first and second mounting bases 34 and 35 may be provided with limiting holes 36 for radially limiting the spiral cable 4. The limiting holes 36 of the first and second mounting bases 34 and 35 radially limit the spiral cable 4 at intervals during the ascent of the lifting column, and the spacing therebetween gradually increases. Providing limiting holes 36 on both the first and second mounting bases 34 and 35 allows the spiral cable 4 to be divided into three shorter sections for radial limiting. Multiple limiting operations on the spiral cable 4 can shorten the length of the spiral cable 4 between the top of the spiral cable 4 and the first mounting base 34, the first mounting base 34 and the second mounting base 35, and the second mounting base 35 and the bottom of the spiral cable 4, thereby better limiting the swaying of the spiral cable 4 and enhancing the effect of the limiting holes 36 on reducing the swaying of the spiral cable 4, thereby further facilitating noise reduction.

[0073] During the ascent of the lifting column, the first fixing seat 34 moves on the first screw rod 211, causing the middle tube 32 to move upward. Simultaneously, the second screw rod 221 rotates with the first screw rod 211 and engages with the second drive nut 231 in the second fixing seat 35, driving the second fixing seat 35 to move on the second screw rod 221, causing the inner tube 31 to move upward. The spacing between the limiting holes 36 of the first fixing seat 34 and the limiting holes 36 of the second fixing seat 35 gradually increases, and the spiral cable 4 also extends along with the sleeve assembly, so that the spiral cable 4 is always divided into three sections, which helps to reduce the shaking of the spiral cable 4.

[0074] As shown in Figures 4 to 6 and 15, in order to further reduce the degree of shaking of the spiral cable, in one embodiment, the upper end of the spiral cable 4 is connected to the driver 1, and the lower end of the spiral cable 4 is connected to the junction box 41 provided at the bottom of the lifting column. When the lifting column is in the extended state, the limiting hole 36 of the first fixing seat 34 is closer to the upper end of the spiral cable 4, and the limiting hole 36 of the second fixing seat 35 is closer to the lower end of the spiral cable 4. The limiting hole 36 of the first fixing seat 34 is closer to the upper end of the spiral cable 4, and the limiting hole 36 of the second fixing seat 35 is closer to the lower end of the spiral cable 4. The upper and lower ends of the spiral cable 4 can serve as two existing limiting points of the spiral cable 4, and the limiting hole 36 of the first fixing seat 34 and the limiting hole 36 of the first fixing seat 34 form four radial limiting points from top to bottom, namely the connection point where the spiral cable 4 is connected to the driver, the limiting hole 36 on the first fixing seat 34, and the limiting hole 36 on the first fixing seat 34 and the connection point where the spiral cable 4 is connected to the junction box, dividing the entire spiral cable 4 into three sections, reducing the length of each section of the spiral cable 4, and the limiting hole 36 of the first fixing seat 34 is closer to the upper end of the spiral cable 4, and the limiting hole 36 of the second fixing seat 35 is closer to the lower end of the spiral cable 4, so that the length difference of each section of the spiral cable 4 is reduced, ensuring that the radial limitation of the spiral cable 4 is more uniform.

[0075] The junction box 41 is provided with a first power interface that is electrically connected to the lower end of the spiral cable 4. The junction box 41 can conceal the portion where the spiral cable 4 is electrically connected to the first power interface, thereby isolating the connection terminals of the two from the transmission assembly and the sleeve assembly. The connection terminals of the spiral cable 4 and the connection terminals of the first power interface will not contact the transmission assembly or the sleeve assembly, thereby preventing current from being transmitted to the transmission assembly or the sleeve assembly and causing leakage or sparks, thereby reducing the safety risks of the lifting column. The limiting hole of the first fixing seat 34 is closer to the upper end of the spiral cable, and the limiting hole of the second fixing seat 35 is closer to the lower end of the spiral cable 4. Taking the vertical installation of the lifting column as an example, this means that during the extension process of the lifting column, the inner tube 31 is fixed to the ground, the middle tube 32 moves upward relative to the inner tube, and the outer tube 33 moves upward relative to the middle tube 32, which facilitates the direct connection of the transmission assembly to drive the sleeve assembly, and can simplify the structure of the transmission assembly.

[0076] The position of the first power interface will not change relative to the ground as the sleeve assembly expands and contracts, thereby not causing the position of the power line connected to the power grid to change.

[0077] As shown in Figure 15, the junction box 41 includes a box body 412 and a wiring cavity 413 formed by the box body 412. The part where the spiral cable 4 is electrically connected to the first power interface is hidden in the wiring cavity 413. The spiral cable 4 and the first power interface are electrically connected in the wiring cavity 413, and the wiring cavity 413 hides the part where the two are electrically connected.

[0078] To prevent the spiral cable 4 from separating from the driver 1 and junction box 41 during expansion and contraction, a first cable clip is connected to the upper end of the spiral cable 4, and a second cable clip 43 is connected to the lower end of the spiral cable 4. The first and second cable clips 43 have the same basic structure. For ease of explanation, this embodiment will illustrate the structure of the second cable clip 43. The second cable clip 43 has an opening 431, allowing one end of the spiral cable 4 to be inserted into the second cable clip 43 through the opening 431. The other end of the spiral cable 4 can also be inserted into the first cable clip, thereby securing the two ends of the spiral cable 4 and allowing the spiral cable 4 to expand and contract to maintain power transmission.

[0079] Among them, the spiral cable 4 is provided with a positioning protrusion 44 protruding in the radial direction of the spiral cable 4, and the second wire card 43 is provided with a positioning groove 432 corresponding to the positioning protrusion 44. The positioning protrusion 44 cooperates with the positioning groove 432 in the process of the spiral cable 4 being clamped into the second wire card 43 to position the spiral cable 4 in the telescopic direction of the transmission component. In the telescopic direction of the transmission component, the inner walls on both sides of the positioning groove 432 have a stopping effect on the positioning protrusion 44, and can maintain the cooperation state of the two in the telescopic direction of the transmission component, and can maintain current supply to the electrical equipment.

[0080] The positioning protrusion 44 can also be set on the line card, and the positioning slot 432 is set on the spiral cable 4.

[0081] The second line card 43 is provided with a positioning hole 433 connected to the opening 431. The spiral cable 4 moves radially through the opening 431 to be stuck in the positioning hole 433, which causes little damage to the spiral cable 4 and also facilitates the separation of the spiral cable 4 from the second line card 43. The inner wall of the opening 431 is provided with a stop protrusion for radially stopping the spiral cable 4. The stop protrusion can stop the spiral cable 4 in the radial direction to keep the spiral cable 4 in the positioning hole 433, so that the spiral cable 4 will not move radially with the extension and contraction of the transmission component and be separated from the second line card 43.

[0082] In one embodiment, a second line card 43 is mounted on the junction box 41. The box body 412 is provided with a first mounting hole 414 for mounting the second line card 43. The first mounting hole 414 communicates with the wiring cavity 413. After mating with the second line card 43, the spiral cable 4 can extend into the wiring cavity 413 through the first mounting hole 414, facilitating the connection between the spiral cable 4 and the junction box 41. The line card can also be integrally formed on the box body 412.

[0083] Box body 412 is also provided with a second assembly hole 415 for mounting the first power interface. Second assembly hole 415 communicates with wiring cavity 413. A terminal for electrically connecting to spiral cable 4 is provided on one side of the first power interface where it extends into wiring cavity 413. A socket hole 416 is provided on the other side of the first power interface. The first power interface is mounted in second assembly hole 415 so that the terminal can extend into wiring cavity 413 through second assembly hole 415. The first power interface is mounted on junction box 41 and secured thereto, keeping the terminal within wiring cavity 413 and preventing the portion of spiral cable 4 where it electrically connects to the terminal from contacting the transmission assembly or sleeve assembly.

[0084] The junction box 41 is arranged at the bottom of the inner tube 31. The lifting column also includes a fixing plate 5, which is fixedly connected to the junction box 41, the transmission assembly and the sleeve assembly. The fixing plate 5 can connect the transmission assembly and the sleeve assembly so that part of the structure of the transmission assembly is connected to part of the structure of the sleeve assembly, so that the transmission assembly can drive the sleeve assembly to extend and retract. The fixing plate 5 simultaneously installs the junction box 41 on the sleeve assembly, which can reduce the parts required to assemble the junction box 41 and reduce the assembly steps.

[0085] As shown in Figures 3 to 6 and Figure 16, during the extension and retraction process of the sleeve assembly, the inner tube 31 and the middle tube 32 can extend and retract relative to the outer tube 33. Since the inner diameter of the inner tube 31 is smaller than the inner diameter of the outer tube 33, the spiral cable 4 is more likely to collide with the tube wall of the inner tube 31. In order to further reduce the noise generated by the gradual collision between the spiral cable 4 and the sleeve, in one embodiment, a limiting sleeve 311 is provided in the inner tube 31 and is sleeved on the outer periphery of the spiral cable 4. The limiting sleeve 311 separates the spiral cable 4 located in the inner tube 31 from the transmission assembly. Since the cross-section of the inner tube 31 is small, the spiral cable 4 in the inner tube 31 is limited by the limiting sleeve 311, which can directly prevent the spiral cable 4 from directly contacting the inner tube 31 due to shaking during the extension and contraction process. If a collision occurs between the limiting sleeve 311 and the spiral cable 4, since the radial spacing between the limiting sleeve 311 and the spiral cable 4 is short, the collision amplitude is small, and it is difficult to generate loud noise. There is also an inner tube 31 on the outside of the limiting sleeve 311, which can also block the noise generated by the collision between the spiral cable 4 and the limiting sleeve 311. Under the radial limitation of the limiting sleeve 311, the shaking amplitude of the spiral cable 4 can be further reduced, which is conducive to further reducing noise.

[0086] The limiting sleeve 311 is arranged on the side of the transmission assembly to be arranged side by side with the transmission assembly to prevent the spiral cable 4 from being entangled with the transmission assembly and affecting the stability of the lifting column. It also facilitates the assembly of the spiral cable 4 and the lifting column. The limiting sleeve 311 partially limits the spiral cable 4, further reducing the collision between the spiral cable 4 and the tube wall of the inner tube 31, and can avoid the spiral cable 4 from directly contacting the inner wall of the sleeve assembly due to shaking during the extension and contraction process. The limiting sleeve 311 has good noise reduction performance and can reduce the noise generated by the collision of the spiral cable 4 with it. Under the obstruction of the limiting sleeve 311, the shaking amplitude of the spiral cable 4 can be reduced, and at the same time, the shaking amplitude of the spiral cable 4 outside the range of the limiting sleeve 311 can be reduced, which is conducive to reducing noise.

[0087] The limiting sleeve 311 can be made of a material with vibration and noise reduction properties, such as rubber. The limiting sleeve 311 can also be configured to expand and contract with the extension and contraction of the transmission assembly. The retractable limiting sleeve 311 can expand after the transmission assembly extends, thereby increasing its blocking effect on the spiral cable 4, thereby preventing the extension of the spiral cable 4 from weakening its own isolation effect on the spiral cable 4.

[0088] As shown in Figures 5 and 6, in one embodiment, both the first fixing seat 34 and the second fixing seat 35 are provided with a limiting hole 36. When the lifting column is in the retracted state, the channel enclosed by the limiting sleeve 311, the limiting hole 36 of the first fixing seat 34, and the limiting hole 36 of the second fixing seat 35 are connected and abutted, enclosing at least the spiral portion of the spiral cable 4. In the retracted state, the channel enclosed by the limiting sleeve 311, the limiting hole 36 of the first fixing seat 34, and the limiting hole 36 of the second fixing seat 35 are connected and abutted, forming a structure that accommodates and protects the spiral cable 4. The spiral cable 4 is also less likely to collide with the sleeve assembly during the movement of the lifting column.

[0089] To prevent grease from dripping to the bottom of the lifting column and seeping out, in one embodiment, an oil reservoir 312 is provided in the inner tube 31. The oil reservoir 312 is located below the transmission assembly and is fixedly connected to the stop sleeve 311. Specifically, the oil reservoir 312 is provided side by side with the stop sleeve 311. The stop sleeve 311 and the oil reservoir 312 can be integrally formed or preassembled as a single unit. The oil reservoir 312 and the stop sleeve 311 are connected side by side, facilitating simultaneous installation, saving installation time and facilitating disassembly and maintenance. When the lifting column is operating at high speed or for extended periods of time, and the temperature in the space where the lifting column is located is high, the grease on the transmission assembly becomes more fluid, causing the grease to drip downward into the oil reservoir 312, preventing the grease from slowly seeping out of the lifting column.

[0090] It is understandable that the oil storage tank 312 can also be independently installed and fixed in the inner tube, but is not limited thereto.

[0091] For other contents not described in this embodiment, please refer to the first embodiment.

[0092] Example 3:

[0093] The present invention also provides an electric lifting table, including a table top, a controller and a lifting column. The table top is fixed to the top of the lifting column. The lifting column is the lifting column in the above embodiment. The controller is electrically connected to the spiral cable 4.

[0094] Some electrical equipment can be placed on the table top. Since the spiral cable 4 is hidden in the lifting column, the external spiral cable 4 and the power cords of the electrical equipment on the table top will not be entangled with each other, causing the power cord and the external spiral cable 4 to be pulled during the lifting process of the table top.

[0095] Under the action of the junction box 41, the lifting column will not leak electricity to avoid electric shock to the user, and the spiral cable will not provide insufficient voltage to the driver 1 due to leakage, affecting the lifting of the table top.

[0096] Based on the above embodiment, in one embodiment, the driving device is further provided with a second power interface, which can be electrically connected to the controller of the electric lift table, or connected to an external circuit, or electrically connected to another lift column.

[0097] In addition to the above-mentioned preferred embodiments, the present invention has other implementation modes. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A lifting column, comprising a driver, a transmission assembly, a sleeve assembly and a spiral cable axially passing through the sleeve assembly, the driver drives the sleeve assembly to extend and retract through the transmission assembly, the spiral cables are arranged side by side on one side of the transmission assembly, the sleeve assembly comprises an inner tube, a middle tube slidably sleeved outside the inner tube and an outer tube slidably sleeved outside the middle tube, one end of the middle tube is provided with a first fixed seat, one end of the inner tube is provided with a second fixed seat, the transmission assembly comprises a first telescopic component, a second telescopic component connected to the first fixed seat and a third telescopic component connected to the second fixed seat, the second telescopic component is connected to the first telescopic component for transmission, the third telescopic component is connected to the second telescopic component for transmission, characterized in that At least one of the first fixing seat and the second fixing seat is provided with a limiting hole for radially limiting the spiral cable, and the spiral cable passes through the limiting hole.

2. The lifting column according to claim 1, characterized in that: The first fixing seat comprises a first mounting portion and a first limiting portion which are arranged side by side in a transverse manner, the second telescopic component is fixed to the first mounting portion, and the limiting hole is arranged in the first limiting portion.

3. The lifting column according to claim 2, characterized in that: The second telescopic component includes a second screw rod and a first transmission nut. The second screw rod is installed on the first mounting portion through a fixed bearing and cooperates with the third telescopic component. The first transmission nut is fixed to the first mounting portion and cooperates with the first telescopic component.

4. The lifting column according to claim 3, characterized in that: The first fixing seat is assembled from a first part and a second part. The first part and the second part clamp and fix the bearing and the first transmission nut. The first part and the second part are both provided with a groove structure and are assembled to form a limiting hole.

5. The lifting column according to claim 2, characterized in that: The outer peripheries of the first mounting portion and the first limiting portion are cooperatively connected with the inner wall of the middle tube.

6. The lifting column according to claim 1, characterized in that: The second fixing seat includes a second mounting portion and a second limiting portion which are arranged side by side in a transverse manner, the third telescopic component is fixed to the second mounting portion, and the limiting hole is arranged in the second limiting portion.

7. The lifting column according to claim 6, characterized in that: The second fixing seat is integrally formed, the limiting hole vertically penetrates the second limiting portion, and the outer periphery of the second fixing seat is cooperatively connected with the inner wall of the inner tube.

8. The lifting column according to claim 1, characterized in that: The first fixing seat and the second fixing seat are both provided with limiting holes for radially limiting the spiral cable. The limiting holes of the first fixing seat and the limiting holes of the second fixing seat are spaced apart from each other to radially limit the spiral cable during the rising process of the lifting column, and the spacing gradually increases.

9. The lifting column according to claim 8, characterized in that: The upper end of the spiral cable is connected to the driver, and the lower end of the spiral cable is connected to a junction box arranged at the bottom of the lifting column. When the lifting column is in an extended state, the limiting hole of the first fixing seat is closer to the upper end of the spiral cable, and the limiting hole of the second fixing seat is closer to the lower end of the spiral cable.

10. The lifting column according to claim 1, characterized in that: The inner tube is provided with a limiting sleeve which is sleeved on the outer circumference of the spiral cable, and the limiting sleeve separates the spiral cable located in the inner tube from the transmission component.

11. The lifting column according to claim 10, characterized in that: The first fixing seat and the second fixing seat are both provided with limiting holes. When the lifting column is in a retracted state, the channel surrounded by the limiting sleeve, the limiting hole of the first fixing seat and the limiting hole of the second fixing seat are connected to each other, at least enclosing the spiral part of the spiral cable.

12. The lifting column according to claim 10, characterized in that: An oil storage tank is arranged in the inner tube, the oil storage tank is located below the transmission assembly, and the oil storage tank is fixedly connected to the limiting sleeve or the inner tube.

13. The lifting column according to claim 1, characterized in that: The outer tube, the middle tube and the inner tube are arranged in sequence from top to bottom, the driver is installed above the outer tube, and the first telescopic component is connected to the output end of the driver for transmission.

14. The lifting column according to claim 13, characterized in that: The first telescopic component includes a first screw rod, the second telescopic component includes a second screw rod and a first transmission nut, and the third telescopic component includes a second transmission nut. The first screw rod passes through the first transmission nut and is inserted into the second screw rod. The first screw rod cooperates with the first transmission nut for transmission, and the second screw rod cooperates with the first screw rod to stop rotation and rotate synchronously with the first screw rod. The second screw rod passes through the second transmission nut for transmission. The first transmission nut is fixed to the first fixed seat, and the second transmission nut is fixed to the second fixed seat.

15. An electric lifting table, comprising a table top, a controller and a lifting column, wherein the table top is fixed to the top of the lifting column, characterized in that: The lifting column is the lifting column according to any one of claims 1 to 14, and the controller is electrically connected to the spiral cable.

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