Multi-stage lifting stand column

Abstract

The utility model discloses a multi-stage lifting stand column, belongs to the technical field of lifting stand columns, solves the problem that the internal space layout of the lifting stand column is unreasonable, and adopts the technical scheme that the multi-stage lifting stand column mainly comprises a lifting assembly and a plurality of stand column sleeves which are connected in a sleeving manner, and the plurality of stand column sleeves comprise a bottom pipe, at least one middle pipe and a top pipe; the middle pipe is located between the bottom pipe and the top pipe, the lifting assembly comprises a first lead screw assembly, a first driving assembly, a second lead screw assembly, a second driving assembly and a control unit used for controlling the first driving assembly and the second driving assembly, the bottom of the middle pipe is connected with a bottom plate, and the top of the top pipe is connected with a top plate. The space between the bottom plate and the top plate is communicated and forms a containing space for containing the control unit, the first driving assembly and the second driving assembly are arranged on the bottom plate, and the control unit is arranged on the top plate to avoid the first driving assembly and the second driving assembly. The utility model is mainly used for realizing reasonable arrangement of a plurality of structures and improving the space utilization rate.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting columns, in particular to a multi-stage lifting column. Background Art

[0002] In the prior art, for example, paragraphs 0012 to 0022 of the specification of invention patent CN106081990A and the appendix Figure 1 As shown, a three-stage lifting column mechanism is disclosed, including a base frame and a primary column, a secondary column, and a tertiary column arranged on the base frame, the primary column, the secondary column, and the tertiary column are movably connected in sequence, and also include a secondary lifting push rod for driving the secondary column to lift and lower, and a tertiary lifting push rod for driving the tertiary column to lift and lower, the secondary lifting push rod also drives a liftable middle plate, the bottom end of the tertiary lifting push rod is connected to the middle plate, so that the lifting and lowering of the three-stage column is realized, but the driver driving the lifting push rod is located in the middle position of the lifting column, dividing the space of the lifting column into upper and lower parts, due to the limited internal space of the lifting column, the arrangement of components such as the control unit with a larger volume is affected. Utility Model Content

[0003] The purpose to be achieved by the utility model is to provide a multi-stage lifting column, which solves the problem of unreasonable internal space layout of the lifting column, realizes the reasonable arrangement of multiple structures, and improves space utilization.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a multi-stage lifting column, including a lifting assembly and a plurality of column sleeves connected with each other, the plurality of column sleeves including a bottom tube, at least one middle tube and a top tube, the middle tube being located between the bottom tube and the top tube, the lifting assembly including a first screw assembly arranged on each middle tube and used to drive each middle tube to lift and lower separately, a first drive assembly for driving the first screw assembly to operate, a second screw assembly arranged on the middle tube and used to drive the top tube to lift and lower, a second drive assembly for driving the second screw assembly to operate, and a control unit for controlling the first drive assembly and the second drive assembly, the bottom of the middle tube is fixedly connected to a bottom plate, the top of the top tube is fixedly connected to a top plate, the space between the bottom plate and the top plate is connected and forms an accommodating space for accommodating the control unit, the first drive assembly and the second drive assembly are arranged on the bottom plate, and the control unit is arranged on the top plate to avoid the first drive assembly and the second drive assembly.

[0005] After adopting the above technical scheme, the utility model has the following advantages: first, each intermediate tube is driven separately by the corresponding first screw assembly, and the top tube is driven separately by the second screw assembly. The user can adjust the height of each intermediate tube and the height of the top tube separately as needed. Of course, the control unit can also control the first screw assembly and the second screw assembly at the same time, so that the intermediate tube and the top tube are raised and lowered synchronously, thereby achieving a very flexible adjustment effect. The independent design of each column sleeve and the screw assembly is convenient for maintenance and replacement. If a part is damaged or needs to be upgraded, the corresponding module can be directly replaced without replacing the entire system, which reduces the maintenance cost and time. Secondly, the first drive assembly and the second drive assembly are arranged on the bottom plate, which can release the top area of ​​the accommodation space and provide more installation space for other components, so that the accommodation space has enough space to accommodate structures such as the control unit. In addition, the control unit is arranged on the top plate, and the control unit effectively avoids the space occupied by the first drive assembly and the second drive assembly, so that the structure arrangement in the accommodation space is more reasonable, the space utilization rate is improved, and the control unit is protected from the vibration or environmental influence that may be generated by the first drive assembly and the second drive assembly below, so as to improve its working stability and ensure its service life.

[0006] Furthermore, the heights of the first drive assembly and the second drive assembly in the vertical direction are not higher than the lowest height of the control unit in the vertical direction.

[0007] By adopting the above-mentioned technical solution, in a space-constrained accommodation space, the vertical space can be used more efficiently, effectively avoiding the first drive assembly and the second drive assembly from occupying the installation space of the control unit, thereby ensuring the normal assembly of the control unit.

[0008] Furthermore, the bottom plate is provided with a first through hole, the first driving assembly can extend into the accommodating space through the first through hole, and the first driving assembly and the second driving assembly are arranged at the bottom of the accommodating space.

[0009] By adopting the above-mentioned technical solution, a first through hole is opened on the bottom plate to allow the first drive assembly to pass through and enter the accommodating space, so that the first drive assembly and the second drive assembly are arranged at the bottom of the accommodating space, the internal space of the lifting column can be used more efficiently, and the structure between each column sleeve can be made compact. Under the condition of limiting the installation distance, more column sleeves can be arranged, which greatly improves the stroke of the lifting column to meet more usage scenarios.

[0010] Furthermore, a second through hole is opened on the base plate, and the first screw assembly can extend into the accommodating space through the second through hole, the second screw assembly is located in the accommodating space, the control unit is located on one side of the accommodating space, and the first screw assembly and the second screw assembly are located on the other side of the accommodating space to avoid the control unit.

[0011] By adopting the above-mentioned technical solution, by opening a second through hole on the bottom plate to allow the first screw assembly to pass through and enter the accommodating space, and by directly placing the second screw assembly in the accommodating space, the internal space of the lifting column can be further more efficiently utilized, and the structure between the column sleeves can be made compact. Under the condition of limiting the installation distance, more column sleeves can be further arranged, thereby greatly increasing the stroke of the lifting column to meet more usage scenarios.

[0012] Furthermore, the first screw assembly and the second screw assembly are arranged side by side on the same side of the accommodating space, and an avoidance gap is provided between the first screw assembly and the second screw assembly.

[0013] By adopting the above-mentioned technical solution, the first screw assembly and the second screw assembly are arranged side by side on the same side of the accommodating space, so that the driving mechanism can be integrated more compactly, and the internal space of the lifting column can be fully utilized, making the overall structure more compact, which is particularly suitable for installation environments with limited space. Secondly, the avoidance gap arranged between the two screw assemblies can effectively avoid mutual interference and unnecessary friction, ensuring that each component can operate independently and smoothly during the lifting operation, thereby improving the stability and reliability of the entire system.

[0014] Furthermore, the first drive assembly includes a first drive motor and a first transmission mechanism connected to the first drive motor, and the first drive motor is transmission-connected to the first screw assembly via the first transmission mechanism so that the first drive motor is placed parallel to the control unit.

[0015] By adopting the above technical solution, the first drive motor can change the direction of power output with the help of the first transmission mechanism, so that the first drive motor is placed horizontally relative to the control unit, which can reduce the vertical space occupied by the first drive motor on the lifting column, so that there is enough space to install other components such as the control unit. Secondly, the horizontal design of the first drive motor helps to lower the center of gravity of the lifting column, enhance the stability of the lifting column, and reduce the risk of tilting or tipping due to external force.

[0016] Furthermore, the first transmission mechanism includes a first worm gear transmission-connected to the output shaft of the first drive motor and a first worm wheel connected to the first worm gear, the first screw assembly includes a first screw and a first transmission nut provided on the first screw, the first transmission nut is fixedly connected to the first worm wheel, the first screw is fixedly connected to the adjacent base plate below, and the first drive motor drives the first transmission nut to rise and fall relative to the first screw through the first worm wheel and the first worm gear to drive the intermediate tube to rise and fall.

[0017] With the above technical solution, since the first lead screw is fixedly connected to the bottom plate adjacent to the bottom, the first lead screw cannot rotate, which ensures the stability of the intermediate tube and reduces the deviation and shaking of the intermediate tube. Secondly, the worm and worm gear mechanism, due to its unique high reduction ratio characteristics, can convert the high-speed and low-torque output of the first drive motor into a low-speed and high-torque output, which is suitable for the intermediate tube lifting operation that requires strong thrust. At the same time, the self-locking function of the worm and worm gear mechanism can provide additional safety protection to prevent the intermediate tube from accidentally sliding down in the absence of power.

[0018] Furthermore, the second drive assembly includes a second drive motor and a second transmission mechanism connected to the second drive motor, and the second drive motor is transmission-connected to the second screw assembly via the second transmission mechanism so that the second drive motor is placed parallel to the control unit.

[0019] By adopting the above technical solution, the second drive motor can change the direction of power output with the help of the second transmission mechanism, so that the second drive motor is placed horizontally relative to the control unit, which can reduce the vertical space occupied by the lifting column, so that there is enough space to install the control unit. Secondly, the horizontal design of the second drive motor helps to further lower the center of gravity of the lifting column, thereby further enhancing the stability of the lifting column and reducing the risk of tilting or tipping due to external force.

[0020] Furthermore, the second transmission mechanism includes a second worm gear transmission-connected to the output shaft of the second drive motor and a second worm wheel connected to the second worm gear, the second screw assembly includes a transmission rod, a second screw and a second transmission nut arranged on the second screw, the second transmission screw is fixedly connected to the second worm wheel, the second transmission nut is fixedly connected to the top cover through the transmission rod, the second drive motor drives the second screw to rotate through the second worm wheel and the second worm gear, and the rotational movement of the second screw drives the second transmission nut to move along the axial direction of the second screw to drive the top pipe to rise and fall.

[0021] With the above technical solution, the second drive motor drives the second lead screw to rotate through the second worm and the second worm gear, so that the second transmission nut moves along the second lead screw axis to drive the top pipe to rise and fall. Secondly, the worm and worm gear mechanism, due to its unique high reduction ratio characteristics, can transform the high-speed and low-torque output of the second drive motor into a low-speed and high-torque output, which is suitable for top pipe lifting operations that require strong thrust. At the same time, the self-locking function of the worm and worm gear mechanism can provide additional safety protection to prevent the top pipe from accidentally sliding down in the absence of power.

[0022] Furthermore, a protective cover is provided on the outer periphery of the second lead screw, and a guide groove arranged parallel to the second lead screw is provided on the protective cover, and a guide block slidingly matched with the guide groove is provided on the second transmission nut, and limit blocks are provided at the upper and lower ends of the guide groove, and the guide block cooperates with the limit block to limit the lifting stroke of the second transmission nut.

[0023] By adopting the above technical solution, the protective cover covers the outer periphery of the second lead screw, which can effectively prevent dust and foreign matter from entering the threads of the second lead screw, reduce the wear caused by the lifting of the second transmission nut, and ensure the service life of the second lead screw. Secondly, the coordinated design of the guide groove and the guide block enables the lifting and lowering movement of the second transmission nut to be precisely guided, which not only ensures the linearity of the movement, reduces the shaking and deviation during the movement, and increases the stability and safety of the entire lifting system, but also strictly limits the upper and lower limit positions of the transmission nut through the setting of the limit block, thereby accurately controlling the lifting and lowering range of the jacking pipe and avoiding mechanical collision or damage caused by excessive lifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described below in conjunction with the accompanying drawings:

[0025] Figure 1 It is a structural schematic diagram of the multi-stage lifting column in the utility model when it is in a retracted state;

[0026] Figure 2 It is a cross-sectional view of the multi-stage lifting column in the utility model when it is in a retracted state;

[0027] Figure 3 It is a cross-sectional view from another perspective when the multi-stage lifting column of the utility model is in a retracted state;

[0028] Figure 4 It is a structural schematic diagram of the first screw assembly and the first drive assembly on the second bottom plate of the utility model;

[0029] Figure 5 It is a structural schematic diagram of the first screw assembly and the first drive assembly on the first base plate of the utility model;

[0030] Figure 6 It is a structural schematic diagram of the second screw assembly and the second drive assembly on the second base plate of the utility model;

[0031] Figure 7 It is a structural schematic diagram of the multi-stage lifting column in the utility model when it is in an extended state;

[0032] Figure 8 It is a cross-sectional view of the multi-stage lifting column in the utility model when it is in an extended state;

[0033] Fig. 9 It is a cross-sectional view from another perspective when the multi-stage lifting column of the utility model is in an extended state;

[0034] Fig.10 It is a structural schematic diagram of the second screw assembly in the utility model;

[0035] In the figure, 100, bottom tube; 101, support plate; 110, first middle tube; 111, first bottom plate; 120, second middle tube; 121, second bottom plate; 122, first through hole; 123, second through hole; 130, top tube; 131, top plate; 140, accommodating space; 141, avoidance gap; 150, first lead screw; 151, first transmission nut; 160, first drive motor; 161, first worm; 162, first worm wheel; 163, first mounting seat; 164, flange; 165, bearing; 170, transmission rod; 171, second lead screw; 172, second transmission nut; 173, protective cover; 174, guide groove; 175, guide block; 176, limit block; 180, second drive motor; 181, second worm; 182, second worm wheel; 183, second mounting seat; 190, control unit. DETAILED DESCRIPTION

[0036] A multi-stage lifting column comprises a lifting assembly and a plurality of column sleeves which are connected with each other, wherein the plurality of column sleeves comprise a bottom tube, at least one middle tube and a top tube, wherein the middle tube is located between the bottom tube and the top tube, the lifting assembly comprises a first screw assembly which is arranged on each middle tube and is used to drive each middle tube to lift and lower separately, a first drive assembly which is used to drive the first screw assembly to operate, a second screw assembly which is arranged on the middle tube and is used to drive the top tube to lift and lower, a second drive assembly which is used to drive the second screw assembly to operate, and a control unit which is used to control the first drive assembly and the second drive assembly, wherein the bottoms of the bottom tube and the middle tube are respectively fixedly connected with bottom plates, the top of the top tube is fixedly connected with a top plate, the space between the bottom plate and the top plate is connected and forms an accommodation space for accommodating the control unit, the first drive assembly and the second drive assembly are arranged on the bottom plate, and the control unit is arranged on the top plate to avoid the first drive assembly and the second drive assembly.

[0037] First, each intermediate tube is driven separately by the corresponding first screw assembly, and the top tube is driven separately by the second screw assembly. The user can adjust the height of each intermediate tube and the height of the top tube separately as needed. Of course, the control unit can also control the first screw assembly and the second screw assembly at the same time, so that the intermediate tube and the top tube can be raised and lowered synchronously, thereby achieving a very flexible adjustment effect. The independent design of each column sleeve and the screw assembly is convenient for maintenance and replacement. If a part is damaged or needs to be upgraded, the corresponding module can be directly replaced without replacing the entire system, which reduces the maintenance cost and time. Secondly, the first drive assembly and the second drive assembly are arranged on the bottom plate, which can release the top area of ​​the accommodation space and provide more installation space for other components, so that the accommodation space has enough space to accommodate structures such as the control unit. In addition, the control unit is arranged on the top plate, and the control unit effectively avoids the space occupied by the first drive assembly and the second drive assembly, so that the structure arrangement in the accommodation space is more reasonable, the space utilization rate is improved, and the control unit is protected from the vibration or environmental influence that may be generated by the first drive assembly and the second drive assembly below, so as to improve its working stability and guarantee its service life.

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0039] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0040] It should be understood that in various embodiments of the present invention, the size of the serial number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0041] It should be understood that in the present invention, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0042] It should be understood that in the present utility model, "plurality" refers to two or more than two. "And / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or any three of X, Y, and Z are included.

[0043] The following specific embodiments are used to describe the technical solution of the utility model 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.

[0044] like Figures 1 to 10 As shown, the utility model provides a multi-stage lifting column, including a lifting assembly and four socketed column sleeves, the four column sleeves include a bottom tube 100, two middle tubes and a top tube 130, the middle tube is located between the bottom tube 100 and the top tube 130, in order to facilitate the distinction between the two middle tubes, the middle tube located at the bottom is the first middle tube 110, the middle tube located at the top is the second middle tube 120, the bottom tube 100 is supported on the bottom surface to be fixed, the lifting assembly includes a first screw assembly provided on each middle tube and used to drive each middle tube to lift and lower separately, a first driving assembly for driving the first screw assembly to operate, and a second screw assembly provided on the second middle tube 120 and used to drive the top tube 130 to lift and lower, and a first driving assembly for driving the second screw assembly to operate The control unit 190 can control each first screw assembly to drive each intermediate tube to rise and fall individually, and control the second screw assembly to drive the top tube 130 to rise and fall individually. The first screw assembly and the second screw assembly can also be controlled to operate together to drive the intermediate tube and the top tube 130 to rise and fall synchronously. The user can adjust the height of each intermediate tube and the height of the top tube 130 individually as needed, thereby achieving a very flexible adjustment effect. The independent design of each column sleeve and the screw assembly is convenient for maintenance and replacement. If a part is damaged or needs to be upgraded, the corresponding module can be directly replaced without replacing the entire system, thereby reducing maintenance costs and time.

[0045] In order to make the internal structure of the lifting column more reasonably arranged, in this embodiment, the bottom of the bottom tube 100 is fixedly connected to the support plate 101, the bottom of the first intermediate tube 110 is fixedly connected to the first bottom plate 111, the bottom of the second intermediate tube 120 is fixedly connected to the second bottom plate 121, and the top of the top tube 130 is fixedly connected to the top plate 131. The top of the first intermediate tube 110, the bottoms of the second intermediate tube 120 and the top tube 130 are all opened. The space between the second bottom plate 121 and the top plate 131 is connected to form an accommodating space 140 for accommodating the control unit 190. The first driving component for driving the first intermediate tube 110 is arranged on the first bottom plate 111, the first driving component for driving the second intermediate tube 120 is arranged on the second bottom plate 121, and the second driving component is also arranged on the second bottom plate 121, which can release the top area of ​​the accommodating space 140 and provide more installation space for other components. Among them, the control unit 190 is arranged on the top plate 131 to avoid the first drive component and the second drive component. The control unit 190 effectively avoids the space occupied by the first drive component and the second drive component, making the structural arrangement in the accommodating space 140 more reasonable, improving space utilization, and also protecting the control unit 190 from vibration or environmental influences that may be generated by the first drive component and the second drive component below, thereby improving its working stability and ensuring its service life.

[0046] It should be noted that the control unit 190 may include a control board, a power supply and other structures, but is not limited thereto.

[0047] Furthermore, the heights of the first drive assembly and the second drive assembly in the vertical direction are not higher than the lowest height of the control unit 190 in the vertical direction, which further limits the installation of the first drive assembly and the second drive assembly, effectively avoiding the first drive assembly and the second drive assembly from occupying the installation space of the control unit 190, and ensuring the normal assembly of the control unit 190.

[0048] In order to increase the stroke of the lifting column, two first drive assemblies are respectively arranged on the upper side of the first bottom plate 111 and the upper side of the second bottom plate 121. A first through hole 122 is opened on the bottom plate of the second intermediate tube 120. The first drive assembly on the first intermediate tube 110 can extend into the accommodating space 140 through the first through hole 122, so that the first drive assembly and the second drive assembly are arranged at the bottom of the accommodating space 140, which can more efficiently utilize the internal space of the lifting column and make the structure between each column sleeve compact. Under the condition of limiting the installation distance, more column sleeves can be arranged, which greatly increases the stroke of the lifting column to meet more usage scenarios.

[0049] Furthermore, a second through hole 123 is provided on the first bottom plate 111 and the second bottom plate 121, and the first screw assembly can extend into the accommodating space 140 through the second through hole 123. The second screw assembly is located in the accommodating space 140, which can further more efficiently utilize the internal space of the lifting column and can also make the structure between the column sleeves compact. Under the condition of limiting the installation distance, more column sleeves can be further provided, thereby greatly increasing the stroke of the lifting column to meet more usage scenarios.

[0050] In order to further reduce the installation space occupied by the first screw assembly and the second screw assembly of the control unit 190, the control unit 190 is located on one side of the accommodating space 140, and the first screw assembly and the second screw assembly are located on the other side of the accommodating space 140 to avoid the control unit 190, thereby effectively utilizing the space inside the device, so that the control unit 190 and the first screw assembly and the second screw assembly each occupy one side, avoiding interference with each other and improving the overall space utilization.

[0051] Among them, the first screw assembly and the second screw assembly are arranged side by side on the same side of the accommodating space 140, so that the arrangement of the first screw assembly and the second screw assembly is more reasonable, and an avoidance gap 141 is provided between the first screw assembly and the second screw assembly, which can effectively avoid mutual interference and unnecessary friction, and ensure that during the lifting operation, each component can operate independently and smoothly, thereby improving the stability and reliability of the entire system.

[0052] Specifically, the first drive assembly includes a first drive motor 160 and a first transmission mechanism connected to the first drive motor 160. The first drive motor 160 is connected to the first lead screw assembly through the first transmission mechanism, so that the first drive motor 160 is placed horizontally relative to the control unit 190. The first drive motor 160 can change the direction of power output with the help of the first transmission mechanism, so that the first drive motor 160 is placed horizontally relative to the control unit 190, which can reduce the vertical space occupied by the first drive motor 160 on the lifting column, so that there is enough space to install other components such as the control unit 190. Secondly, the horizontal design of the first drive motor 160 also helps to lower the center of gravity of the lifting column, enhance the stability of the lifting column, and reduce the risk of tilting or tipping due to external force.

[0053] The first transmission mechanism includes a first mounting seat 163, a first worm 161 transmission-connected to the output shaft of the first drive motor 160, and a first worm wheel 162 connected to the first worm 161. The first screw assembly includes a first screw 150 and a first transmission nut 151 disposed on the first screw 150. The first worm wheel 162 is fixed to the first transmission nut 151. The first transmission nut 151 is disposed on the first mounting seat 163 through a bearing 165. The first drive motor 160 and the first mounting seat 163 are mounted on the bottom plate. The first screw 150 passes through the second through hole 123 and is fixedly connected to the bottom plate adjacent thereto. The first screw 150 cannot rotate, thereby ensuring the stability of the intermediate tube. , reducing the deviation and shaking of the intermediate tube, the first drive motor 160 drives the first worm 161 to rotate, the rotation of the first worm 161 drives the first worm wheel 162 to rotate, and the first transmission nut 151 rotates synchronously while the first worm wheel 162 rotates, the first transmission nut 151 rises and falls relative to the first lead screw 150, thereby driving the intermediate tube to rise and fall relative to the intermediate tube below. The worm and worm gear mechanism, due to its unique high reduction ratio characteristics, can convert the high-speed and low-torque output of the first drive motor 160 into a low-speed and high-torque output, which is suitable for the intermediate tube lifting operation that requires strong thrust. At the same time, the self-locking function of the worm and worm gear mechanism can provide additional safety protection to prevent the intermediate tube from accidentally sliding down in the absence of power.

[0054] It should be noted that in this embodiment, the first lead screw 150 of the first intermediate tube 110 passes through the second through hole 123 and is fixed to the support plate 101 through the flange 164. The first intermediate tube 110 is lifted relative to the bottom tube 100. The second through hole 123 on the second intermediate tube 120 for the first lead screw 150 to pass through and enter the accommodating space 140 is located inside the first through hole 122, eliminating the need for a single hole. The second lead screw 171 of the second intermediate tube 120 passes through the second through hole 123 and is fixed to the first bottom plate 111 through the flange 164. The second intermediate tube 120 is lifted relative to the first lifting tube.

[0055] In addition, the second drive assembly includes a second drive motor 180 and a second transmission mechanism connected to the second drive motor 180. The second drive motor 180 is transmission-connected to the second screw assembly via the second transmission mechanism. The second drive motor 180 can change the direction of power output with the help of the second transmission mechanism, so that the second drive motor 180 is placed horizontally relative to the control unit 190, which can reduce the vertical space occupied by the lifting column, so that there is enough space to install the control unit 190. Secondly, the horizontal design of the second drive motor 180 also helps to further lower the center of gravity of the lifting column, thereby further enhancing the stability of the lifting column and reducing the risk of tilting or tipping due to external force.

[0056] The second transmission mechanism includes a second mounting seat 183, a second worm 181 connected to the output shaft of the second drive motor 180, and a second worm wheel 182 connected to the second worm 181. The second drive motor 180 and the second mounting seat 183 are fixed to the bottom plate of the second intermediate tube 120. The second screw assembly includes a transmission rod 170, a second screw 171 and a second transmission nut 172 arranged on the second screw 171. The second worm wheel 182 is fixed to the second transmission screw. The second transmission screw is arranged on the second mounting seat 183 through a bearing 165. The second mounting seat 183 is fixed to the second intermediate tube 120. On the second bottom plate 121, the second transmission nut 172 is fixedly connected to the top cover through the transmission rod 170, and the second drive motor 180 drives the second worm 181 to rotate, and the rotation of the second worm 181 drives the second worm wheel 182 to rotate, and at the same time drives the second lead screw 171 to rotate, and the rotation of the second lead screw 171 drives the second transmission nut 172 to move along the axial direction of the second lead screw 171 to drive the top tube 130 to rise and fall, and the worm and worm gear mechanism can convert the high-speed and low-torque output of the second drive motor 180 into a low-speed and high-torque output, which is suitable for the lifting operation of the top tube 130 that requires strong thrust. At the same time, the self-locking function of the worm and worm gear mechanism can provide additional safety protection to prevent the top tube 130 from accidentally sliding down without power.

[0057] Since the second lead screw 171 is rotatable, in order to improve the installation of the operation, a protective cover 173 is provided on the outer periphery of the second lead screw 171, which can effectively prevent dust and foreign matter from entering the thread space of the second lead screw 171, reduce the wear caused by the lifting of the second transmission nut 172, and ensure the service life of the second lead screw 171. Secondly, a guide groove 174 arranged parallel to the second lead screw 171 is provided on the protective cover 173, and a guide block 175 slidingly matched with the guide groove 174 is provided on the second transmission nut 172. The guide groove 174 and the guide block 175 are The matching design makes the lifting and lowering movement of the second transmission nut 172 precisely guided, which not only ensures the linearity of the movement, reduces the shaking and deviation during the movement, and increases the stability and safety of the entire lifting system. In addition, limit blocks 176 are provided at the upper and lower ends of the guide groove 174. The guide block 175 cooperates with the limit block 176 to limit the lifting and lowering stroke of the second transmission nut 172, strictly limiting the upper and lower limit positions of the transmission nut, thereby accurately controlling the lifting and lowering range of the top pipe 130 and avoiding mechanical collision or damage caused by excessive lifting.

[0058] When using, Figures 1 to 6 As shown, the multi-stage lifting column is in a retracted state. Figures 7 to 10 As shown, the multi-stage lifting column is in an extended state.

[0059] It can be understood that three column sleeves can also be provided, and the three column sleeves include a bottom tube, a middle tube and a top tube, and the first screw assembly, the first drive assembly, the second screw assembly and the second drive assembly are all arranged on the bottom plate of the middle tube.

[0060] It can be understood that there can also be five column sleeves, which include a bottom tube, three middle tubes and a top tube, each first screw assembly and a first drive assembly are arranged on each middle tube, and the second screw assembly and the second drive assembly are arranged on the bottom plate of the topmost middle tube.

[0061] It is understandable that there may be six column sleeves, the six column sleeves include a bottom tube, four middle tubes and a top tube, each first screw assembly and a first drive assembly are arranged on each middle tube, and the second screw assembly and the second drive assembly are arranged on the bottom plate of the uppermost middle tube. The number of column sleeves is not limited thereto.

[0062] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments in 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 multi-stage lifting column, comprising a lifting assembly and a plurality of sleeved column sleeves, characterized in that: The multiple column sleeves include a bottom tube, at least one middle tube and a top tube, the middle tube is located between the bottom tube and the top tube, the lifting assembly includes a first screw assembly provided on each middle tube and used to drive each middle tube to lift and lower separately, a first drive assembly for driving the first screw assembly to operate, a second screw assembly provided on the middle tube and used to drive the top tube to lift and lower, a second drive assembly for driving the second screw assembly to operate, and a control unit for controlling the first drive assembly and the second drive assembly, the bottom of the middle tube is fixedly connected to a bottom plate, the top of the top tube is fixedly connected to a top plate, the space between the bottom plate and the top plate is connected to form a accommodating space for accommodating the control unit, the first drive assembly and the second drive assembly are arranged on the bottom plate, and the control unit is arranged on the top plate to avoid the first drive assembly and the second drive assembly.

2. The multi-stage lifting column according to claim 1, characterized in that: The heights of the first drive assembly and the second drive assembly in the vertical direction are not higher than the lowest height of the control unit in the vertical direction.

3. The multi-stage lifting column according to claim 1, characterized in that: The bottom plate is provided with a first through hole, and the first driving assembly can extend into the accommodation space through the first through hole. The first driving assembly and the second driving assembly are arranged at the bottom of the accommodation space.

4. The multi-stage lifting column according to claim 1, characterized in that: A second through hole is provided on the bottom plate, and the first screw assembly can extend into the accommodating space through the second through hole. The second screw assembly is located in the accommodating space. The control unit is located on one side of the accommodating space, and the first screw assembly and the second screw assembly are located on the other side of the accommodating space to avoid the control unit.

5. The multi-stage lifting column according to claim 4, characterized in that: The first screw assembly and the second screw assembly are arranged side by side on the same side of the accommodating space, and an avoidance gap is provided between the first screw assembly and the second screw assembly.

6. The multi-stage lifting column according to claim 1, characterized in that: The first drive assembly includes a first drive motor and a first transmission mechanism connected to the first drive motor. The first drive motor is transmission-connected to the first screw assembly via the first transmission mechanism so that the first drive motor is placed parallel to the control unit.

7. The multi-stage lifting column according to claim 6, characterized in that: The first transmission mechanism includes a first worm gear transmission-connected to the output shaft of the first drive motor and a first worm wheel connected to the first worm gear, the first screw assembly includes a first screw and a first transmission nut arranged on the first screw, the first transmission nut is fixedly connected to the first worm wheel, the first screw is fixedly connected to the adjacent bottom plate below, and the first drive motor drives the first transmission nut to rise and fall relative to the first screw through the first worm wheel and the first worm gear to drive the intermediate tube to rise and fall.

8. The multi-stage lifting column according to claim 1, characterized in that: The second drive assembly includes a second drive motor and a first transmission mechanism connected to the second drive motor. The second drive motor is transmission-connected to the second lead screw assembly via the second transmission mechanism so that the second drive motor is placed parallel to the control unit.

9. The multi-stage lifting column according to claim 8, characterized in that: The second transmission mechanism includes a second worm gear transmission-connected to the output shaft of the second drive motor and a second worm wheel connected to the second worm gear, the second lead screw assembly includes a transmission rod, a second lead screw and a second transmission nut arranged on the second lead screw, the second lead screw is fixedly connected to the second worm wheel, the second transmission nut is fixedly connected to the top cover through the transmission rod, the second drive motor drives the second lead screw to rotate through the second worm wheel and the second worm gear, and the rotational movement of the second lead screw drives the second transmission nut to move along the axial direction of the second lead screw to drive the top pipe to rise and fall.

10. The multi-stage lifting column according to claim 9, characterized in that: A protective cover is provided on the outer periphery of the second lead screw, and a guide groove arranged parallel to the second lead screw is provided on the protective cover. A guide block slidingly matched with the guide groove is provided on the second transmission nut, and limit blocks are provided at the upper and lower ends of the guide groove. The guide block cooperates with the limit block to limit the lifting stroke of the second transmission nut.

Images