Lifting device and work platform

Abstract

The utility model discloses a lifting device and a working platform, and relates to the technical field of working platform, the lifting device comprises a supporting column, a lifting column and a lifting assembly, the lifting column can be installed on the supporting column in a vertically sliding mode, the lifting assembly comprises a base, a lifting nut, a lead screw and a driving structure, the base is arranged on the supporting column, and the lifting nut is arranged on the base. The lifting nut is rotationally installed on the base, the driving structure is arranged on the base and connected to the lifting nut so as to drive the lifting nut to rotate, the lead screw extends in the vertical direction and is in threaded connection with the lifting nut, and the bottom end of the lead screw is connected to the bottom end of the lifting column. According to the lifting device and the working platform, the force borne by the lead screw is mainly tensile force, bending deformation and breakage are not prone to occurring, and the service life is longer.

Description

Technical Field

[0001] This utility model relates to the field of work platform technology, and in particular to a lifting device and a work platform. Background Technology

[0002] When maintaining aircraft or trains, a work platform is required. In some related technologies, the lifting device of a work platform includes a support column, a lead screw, a lifting nut, and a drive component. The lifting nut is rotatably mounted on the support column, the lead screw is threadedly connected to the lifting nut, and the top of the lead screw is connected to the platform. The drive component is connected to the lifting nut, controlling its rotation. The lifting nut then controls the lifting of the lead screw, which in turn moves the platform up and down. However, because the lead screw bears the pressure applied by the platform for extended periods, it is prone to bending and deformation, and may even break, resulting in a short service life. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a lifting device in which the lead screw is primarily subjected to tensile force, making it less prone to bending deformation and breakage, and resulting in a longer service life.

[0004] This utility model also proposes a work platform with the above-mentioned lifting device.

[0005] According to a first aspect of the present invention, a lifting device includes a support column, a lifting column, and a lifting assembly. The lifting column is slidably mounted on the support column. The lifting assembly includes a base, a lifting nut, a lead screw, and a drive structure. The base is disposed on the support column, the lifting nut is rotatably mounted on the base, and the drive structure is disposed on the base and connected to the lifting nut to drive the lifting nut to rotate. The lead screw extends vertically and is threadedly connected to the lifting nut, and the bottom end of the lead screw is connected to the bottom end of the lifting column.

[0006] The lifting device according to the embodiments of the present utility model has at least the following beneficial effects:

[0007] The bottom end of the support column is used to support the ground, and the top end of the lifting column is used to install the work platform. The bottom end of the lead screw is connected to the lifting column. The lead screw cannot rotate. When the drive structure controls the lifting nut to rotate, the lifting nut will drive the lead screw to move vertically in a straight line. The lead screw can then drive the lifting column to rise and fall relative to the support column, thereby realizing the lifting and lowering of the work platform. According to the lifting device of this utility model embodiment, the lifting column and the lead screw jointly bear the weight of the work platform and the load on it. Since the bottom end of the lead screw is connected to the bottom end of the lifting column, the force applied by the lifting column to the lead screw is mainly tensile force. The lead screw is not prone to bending deformation and breakage, resulting in a longer service life.

[0008] According to some embodiments of the present invention, the drive structure includes a worm gear and a worm. The worm gear is rotatably mounted on the base and coaxially connected with the lifting nut. The lead screw passes through the worm gear, and the worm is rotatably mounted on the base and meshes with the worm gear. The worm is used to connect to a motor.

[0009] According to some embodiments of the present invention, the lifting assembly further includes a safety nut and an indicator. The safety nut is coaxially connected to the bottom end of the worm gear via a key structure and can slide vertically relative to the worm gear. The lead screw is threadedly connected to the safety nut. The indicator is disposed on the base to indicate the height position of the safety nut.

[0010] According to some embodiments of the present invention, the support column is configured as a hollow tube, the lifting column is slidably inserted into the support column, and the lifting device further includes a guide assembly, the guide assembly including a mounting frame and a plurality of guide wheels, the mounting frame is disposed on the support column and extends along the circumference of the support column, the plurality of guide wheels are mounted on the mounting frame and arranged along the circumference of the support column, and the sidewalls of the guide wheels are attached to the outer sidewall of the lifting column.

[0011] According to some embodiments of the present invention, the guide assembly further includes multiple guide wheel mounting plates and multiple adjusting plates. The multiple guide wheel mounting plates are located on the outer or inner side of the mounting frame and are arranged circumferentially along the support column. The multiple guide wheels are respectively mounted on the multiple guide wheel mounting plates, and the multiple adjusting plates are respectively clamped between the mounting frame and the multiple guide wheel mounting plates. The guide wheel mounting plates and the adjusting plates are connected to the mounting frame by fasteners.

[0012] According to some embodiments of the present invention, the guide components are provided in multiple ways and arranged vertically. The lifting device further includes a protective component, which includes a first protective cover and a second protective cover. The first protective cover is sleeved on the outside of the top of the support column. The base and one of the guide components are located inside the first protective cover. The second protective cover is sleeved on the outside of the support column. The remaining guide components are located inside the second protective cover.

[0013] According to some embodiments of the present invention, the top of the lifting column is provided with a connecting plate, the bottom of the first protective cover is connected to the top of the support column, the top of the first protective cover is connected to the connecting plate, and the first protective cover can be adjusted vertically.

[0014] According to some embodiments of the present invention, the top end of the lifting column is provided with an upper mounting seat, the upper mounting seat is provided with an insertion hole, the top end of the lead screw passes through the insertion hole, the bottom end of the lifting column is provided with a lower mounting seat, and the bottom end of the lead screw is hinged to the lower mounting seat.

[0015] According to some embodiments of this utility model, the top and bottom ends of the lifting column are provided with limiting portions, and the top end of the support column is provided with a blocking portion. When the lifting column slides downward to the first state and upward to the second state, the corresponding limiting portion abuts against the blocking portion to restrict the lifting column from continuing to slide; and / or, the top end of the support column is provided with a limit switch, and the top and bottom ends of the lifting column are provided with contact portions. When the lifting column slides downward to the first state and upward to the second state, the limit switch contacts the corresponding contact portion to control the drive structure to stop working.

[0016] The work platform according to the second aspect embodiment of the present invention includes the lifting device described in the first aspect embodiment above.

[0017] The operating platform according to the embodiments of this utility model has at least the following beneficial effects:

[0018] The lifting device according to the first aspect of this utility model has a support column at its bottom end for supporting the ground, a lifting column at its top end for mounting the work platform, and a lead screw at its bottom end connected to the lifting column. The lead screw cannot rotate. When the drive structure controls the lifting nut to rotate, the lifting nut will drive the lead screw to move vertically in a straight line. The lead screw can then drive the lifting column to rise and fall relative to the support column, thereby realizing the lifting and falling of the work platform. The lifting column and the lead screw jointly bear the weight of the work platform and the load on it. Since the lead screw is connected to the bottom end of the lifting column, the force applied by the lifting column to the lead screw is mainly tensile force. The lead screw is not prone to bending deformation and breakage, resulting in a longer service life.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and some of these additional aspects and advantages will become apparent from the description or may be learned by practice of the invention. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 This is a schematic diagram of the lifting device of this utility model in the retracted state;

[0022] Figure 2 This is a schematic diagram of the lifting device of this utility model in its extended state and after the protective components have been removed.

[0023] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 This is one perspective view of the supporting column;

[0025] Figure 5 Another perspective view of the supporting column;

[0026] Figure 6 This is one perspective view of the rising bollard;

[0027] Figure 7 This is another perspective view of the rising bollard;

[0028] Figure 8 This is a structural schematic diagram of the lifting assembly;

[0029] Figure 9 This is a diagram illustrating the installation of the safety nut;

[0030] Figure 10 for Figure 9 A sectional view;

[0031] Figure 11 This is a schematic diagram of the indicator installation.

[0032] Figure 12 This is a schematic diagram of the guide component.

[0033] Figure 13 for Figure 12 A sectional view;

[0034] Figure 14 This is a schematic diagram of the structure of the first protective shield;

[0035] Figure 15 This is a schematic diagram of the second protective shield.

[0036] Icon labels:

[0037] Support column 100; base mounting plate 101; first mounting hole 102; second mounting hole 103; third mounting hole 104;

[0038] Lifting column 200; connecting plate 201; upper mounting base 202; lower mounting base 203; limiting part 204; contact part 205;

[0039] Lifting assembly 300; base 301; lifting nut 302; lead screw 303; drive structure 304; worm gear 305; worm 306; safety nut 307; key structure 308; indicator 309; upper base 310; lower base 311;

[0040] Guide assembly 400; mounting frame 401; guide wheel 402; guide wheel mounting plate 403; adjusting plate 404; guide wheel support 405;

[0041] Protective component 500; first protective cover 501; second protective cover 502; cover unit 503. Detailed Implementation

[0042] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0043] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0045] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0046] The following is for reference. Figures 1 to 15 This invention describes a lifting device and a work platform according to embodiments of the present invention.

[0047] The lifting device according to the first aspect of the present invention, such as Figures 1 to 15 As shown, it includes a support column 100, a lifting column 200, and a lifting assembly 300.

[0048] The support column 100 can extend vertically and can be a hollow tube. The bottom end of the support column 100 is used to support the ground, and the top end of the support column 100 can be provided with a base mounting plate 101. The base mounting plate 101 is used to install the base 301 of the lifting assembly 300.

[0049] The lifting column 200 can be slidably installed on the support column 100. For example, the lifting column 200 can be inserted into the support column 100 and can slide up and down. The top of the lifting column 200 is used to support the work platform. Specifically, the work platform can be supported by the cooperation of multiple lifting columns 200 with lifting devices.

[0050] The lifting assembly 300 includes a base 301, a lifting nut 302, a lead screw 303, and a drive structure 304. The base 301 is mounted on the support column 100, for example, on the base mounting plate 101 at the top of the support column 100. The lifting nut 302 is rotatably mounted on the base 301 and has a threaded hole. The axial direction of the threaded hole of the lifting nut 302 can extend vertically. The drive structure 304 is mounted on the base 301 and connected to the lifting nut 302 to drive the lifting nut 302 to rotate. The lead screw 303 extends vertically and passes through the threaded hole of the lifting nut 302. The lead screw 303 is threadedly connected to the threaded hole of the lifting nut 302. The bottom end of the lead screw 303 is connected to the bottom end of the lifting column 200. When the lifting nut 302 rotates, the lead screw 303 does not rotate with the lifting nut 302, but moves linearly vertically. When the drive structure 304 controls the lifting nut 302 to rotate, since the bottom end of the screw 303 is connected to the bottom end of the lifting column 200, it will not rotate with the lifting nut 302, but will move in a straight line along the vertical direction, thereby driving the lifting column 200 to rise and fall relative to the support column 100, thus realizing the lifting of the work platform.

[0051] In this invention, the bottom end of the support column 100 is used to support the ground, the top end of the lifting column 200 is used to install the work platform, and the bottom end of the lead screw 303 is connected to the lifting column 200. The lead screw 303 cannot rotate. When the drive structure 304 controls the lifting nut 302 to rotate, the lifting nut 302 will drive the lead screw 303 to move vertically in a straight line. The lead screw 303 can then drive the lifting column 200 to rise and fall relative to the support column 100, thereby realizing the lifting and lowering of the work platform. According to the lifting device of this embodiment, the lifting column 200 and the lead screw 303 jointly bear the weight of the work platform and the load on it. Since the bottom end of the lead screw 303 is connected to the bottom end of the lifting column 200, the force applied by the lifting column 200 to the lead screw 303 is mainly tensile force. The lead screw 303 is not prone to bending deformation and breakage, and has a longer service life.

[0052] refer to Figures 8 to 10As shown, in some embodiments of this utility model, the drive structure 304 includes a worm gear 305 and a worm 306. The worm gear 305 is rotatably mounted on the base 301 and coaxially connected with the lifting nut 302. The lead screw 303 passes through the worm gear 305, and the worm 306 is rotatably mounted on the base 301 and meshes with the worm gear 305. The worm 306 is used to connect to the motor. For example, the base 301 may include an upper base 310 and a lower base 311 connected to each other. The upper base 310 may be equipped with a bearing, on which the worm gear 305 and the worm 306 are mounted. The rotation axis of the worm gear 305 may extend vertically and be coaxial with the lifting nut 302. The lifting nut 302 may be fixedly connected to the top of the worm gear 305 by welding or fasteners, or it may be integrally formed with the worm gear 305. The rotation of the worm gear 305 can drive the lifting nut 302 to rotate. The rotation axis of the worm 306 may extend horizontally and mesh with the worm gear 305. The base 301 may also be equipped with a motor, which is connected to the worm 306 to drive the worm 306 to rotate. The worm 306 then drives the worm gear 305 to rotate, and the worm gear 305 in turn drives the lifting nut 302 to rotate. The structure is simple and the operation is convenient.

[0053] It should be noted that the drive structure 304 can also be other structures. For example, it can be a gear coaxially connected with the lifting nut 302, and the motor can drive the gear to rotate.

[0054] refer to Figure 8 and Figure 11 As shown, in some embodiments of this utility model, the lifting assembly 300 further includes a safety nut 307 and an indicator 309. The safety nut 307 is coaxially connected to the bottom end of the worm gear 305 via a key structure 308 and can slide vertically relative to the worm gear 305. The lead screw 303 is threadedly connected to the safety nut 307. The indicator 309 is provided on the base 301 to indicate the height position of the safety nut 307. For example, the outer wall of the safety nut 307 can be connected to the bottom end of the inner wall of the worm gear 305 via a key structure 308 such as a flat key or spline, thereby achieving a coaxial connection between the safety nut 307 and the bottom end of the worm gear 305. The worm gear 305 can then drive the safety nut 307 to rotate. The height of the key structure 308 can be smaller than the height of the keyway used to install the key structure 308. Thus, the safety nut 307 can slide vertically relative to the worm gear 305, and the bottom end of the safety nut 307 can protrude beyond the bottom end of the worm gear 305. The lead screw 303 passes through the safety nut 307 and is threadedly connected to the threaded hole of the safety nut 307. An indicator 309 can be provided on the lower base 311 of the base 301. The indicator 309 can have multiple scale lines, which work together to indicate the height position of the safety nut 307.

[0055] During prolonged use, the external thread of the lead screw 303 may experience significant wear, which not only affects the fit between the lead screw 303 and the lifting nut 302, but also increases the risk of the lead screw 303 falling off and causing a safety accident. In this embodiment, a safety nut 307 is provided. The safety nut 307 rotates with the worm gear 305 and can slide vertically relative to the worm gear 305. The safety nut 307 is threadedly connected to the lead screw 303. When the external thread of the lead screw 303 is only slightly worn, the safety nut 307 is limited by the external thread of the lead screw 303 and will not slide down. When the external thread of the lead screw 303 is significantly worn, resulting in a large vertical gap between the external thread of the lead screw 303 and the internal thread of the safety nut 307, the safety nut 307 will slide down and lower its height. The staff can intuitively understand the height position of the safety nut 307 by observing the scale lines on the indicator 309. By observing the height position of the safety nut 307, the wear condition of the external thread of the lead screw 303 can be clearly seen, thus reminding the staff to replace the lead screw 303 in a timely manner, making it more convenient to use and safer.

[0056] refer to Figures 2 to 5 , Figure 12 and Figure 13 As shown, in some embodiments of this utility model, the support column 100 is configured as a hollow tube, and the lifting column 200 is slidably inserted into the support column 100. The lifting device also includes a guide assembly 400, which includes a mounting frame 401 and a plurality of guide wheels 402. The mounting frame 401 is disposed on the support column 100 and extends along the circumference of the support column 100. The plurality of guide wheels 402 are mounted on the mounting frame 401 and arranged along the circumference of the support column 100. The sidewalls of the guide wheels 402 are attached to the outer sidewalls of the lifting column 200. For example, the support column 100 may be provided with multiple first mounting holes 102 corresponding to the guide component 400. The mounting frame 401 of the guide component 400 may be installed on the support column 100 by fasteners engaging with the first mounting holes 102. The mounting frame 401 may be an annular plate structure and may surround the outside of the support column 100. The guide wheel 402 may be installed on the mounting frame 401 by guide wheel support 405. Multiple guide wheels 402 may be provided, for example, eight. Two guide wheels may be provided on each side of the support column 100. The rotation axis of the guide wheel 402 may extend horizontally, and the outer wall of the guide wheel 402 may be attached to the outer wall of the lifting column 200.

[0057] In this embodiment, multiple guide wheels 402 guide the lifting column 200, which not only makes the lifting of the lifting column 200 more precise, but also reduces the friction force experienced by the lifting column 200 during lifting, making the lifting smoother.

[0058] refer to Figure 12 and Figure 13As shown, in some embodiments of this utility model, the guide assembly 400 further includes multiple guide wheel mounting plates 403 and multiple adjusting plates 404. The multiple guide wheel mounting plates 403 are located on the outer or inner side of the mounting frame 401 and are arranged circumferentially along the support column 100. Multiple guide wheels 402 are respectively mounted on the multiple guide wheel mounting plates 403, and multiple adjusting plates 404 are respectively clamped between the mounting frame 401 and the multiple guide wheel mounting plates 403. The guide wheel mounting plates 403 and adjusting plates 404 are connected to the mounting frame 401 by fasteners. For example, the guide wheel mounting plates 403 may be located on the outer side of the mounting frame 401, the mounting frame 401 may be provided with a clearance groove, the guide wheel support 405 may pass through the clearance groove, and the adjusting plates 404 may be clamped between the outer wall of the mounting frame 401 and the guide wheel mounting plates 403.

[0059] In this embodiment, by changing the thickness of the adjusting plate 404 or setting different numbers of adjusting plates 404, the distance between two opposing guide wheels 402 can be adjusted. This not only adjusts the tension between the guide wheel 402 and the lifting column 200, but also makes it applicable to lifting columns 200 of different sizes, thus improving its practicality.

[0060] refer to Figure 1 , Figure 3 , Figure 14 and Figure 15 As shown, in some embodiments of this utility model, multiple guide components 400 are provided and arranged vertically. The lifting device also includes a protective component 500, which includes a first protective cover 501 and a second protective cover 502. The first protective cover 501 is sleeved on the outer side of the top of the support column 100, and the base 301 and one of the guide components 400 are located inside the first protective cover 501. The second protective cover 502 is sleeved on the outer side of the support column 100, and the remaining guide components 400 are located inside the second protective cover 502. For example, two guide components 400 can be provided, arranged vertically. The upper guide component 400 and the base 301 are located inside the first protective cover 501, and the lower guide component 400 is located inside the second protective cover 502.

[0061] In this embodiment, multiple guide components 400 are provided to improve the guiding effect on the support column 100. The first protective cover 501 and the second protective cover 502 are provided to protect the lifting component 300 and the guide component 400, preventing them from being exposed to the outside and accumulating dust, rainwater, and causing damage.

[0062] It should be noted that in some embodiments of this utility model, the second protective cover 502 can be formed by splicing and enclosing four cover units 503.

[0063] refer to Figure 1 and Figure 2As shown, in some embodiments of this utility model, the top of the lifting column 200 is provided with a connecting plate 201, the bottom end of the first protective cover 501 is connected to the top end of the support column 100, and the top end of the first protective cover 501 is connected to the connecting plate 201. The first protective cover 501 can be adjusted vertically. For example, the first protective cover 501 can be made of a soft corrugated pipe. In this way, when the lifting column 200 is raised or lowered, the first protective cover 501 can correspondingly extend or retract. The first protective cover 501 can not only protect the lifting column 200, but also prevent dust and rainwater from entering the support column 100.

[0064] refer to Figure 6 As shown, in some embodiments of this utility model, the top of the lifting column 200 is provided with an upper mounting base 202, which has an insertion hole. The top of the lead screw 303 passes through the insertion hole, and the bottom of the lifting column 200 is provided with a lower mounting base 203. The bottom of the lead screw 303 is hinged to the lower mounting base 203. In this embodiment, the top of the lead screw 303 passes through the insertion hole of the upper mounting base 202 and is not fixedly connected to the upper mounting base 202. Therefore, the pressure on the lead screw 303 is relatively small, which can reduce the possibility of deformation or even breakage of the lead screw 303. The bottom of the lead screw 303 is hinged to the lower mounting base 203, which facilitates installation.

[0065] refer to Figures 4 to 7 As shown, in some embodiments of this utility model, the top and bottom ends of the lifting column 200 are provided with limiting portions 204, and the top end of the support column 100 is provided with a blocking portion. When the lifting column 200 slides downward to the first state and upward to the second state, the corresponding limiting portion 204 abuts against the blocking portion to restrict the lifting column 200 from continuing to slide. For example, the top end of the support column 100 is provided with a second mounting hole 103, and the blocking portion is installed through the second mounting hole 103. When the lifting column 200 slides downward to the first state, the upper limiting portion 204 abuts against the blocking portion, thereby restricting the lifting column 200 from continuing to slide downward and causing damage. When the lifting column 200 slides upward to the second state, the lower limiting portion 204 abuts against the blocking portion, thereby restricting the lifting column 200 from continuing to slide upward and causing damage, thus improving safety.

[0066] It should be noted that in the first state, the lifting column 200 is retracted into the support column 100, and in the second state, the lifting column 200 extends above the support column 100.

[0067] refer to Figures 4 to 7As shown, in some embodiments of this utility model, a limit switch is provided at the top of the support column 100, and contact portions 205 are provided at both the top and bottom of the lifting column 200. When the lifting column 200 slides downward to the first state and upward to the second state, the limit switch contacts the corresponding contact portion 205 to control the drive structure 304 to stop working. For example, a third mounting hole 104 is provided at the top of the support column 100, and a limit switch is installed through the third mounting hole 104. The limit switch can be electrically connected to the motor of the drive structure 304. When the lifting column 200 slides downward to the first state, the limit switch contacts the upper contact portion 205 to activate and control the drive structure 304 to stop working. When the lifting column 200 slides upward to the second state, the limit switch contacts the lower contact portion 205 to activate and control the drive structure 304 to stop working, thereby preventing the lifting column 200 from continuing to rise and fall and causing damage, thus improving safety.

[0068] The work platform according to the second aspect of the present invention includes the lifting device described in the first aspect of the present invention.

[0069] According to the work platform of this utility model embodiment, by adopting the lifting device of the first aspect embodiment of this utility model, the bottom end of the support column 100 is used to support the ground, the top end of the lifting column 200 is used to install the work platform, and the bottom end of the lead screw 303 is connected to the lifting column 200. The lead screw 303 cannot rotate. When the drive structure 304 controls the lifting nut 302 to rotate, the lifting nut 302 will drive the lead screw 303 to move vertically in a straight line. The lead screw 303 can then drive the lifting column 200 to rise and fall relative to the support column 100, thereby realizing the lifting and lowering of the work platform. According to the lifting device of this utility model embodiment, the lifting column 200 and the lead screw 303 jointly bear the weight of the work platform and the load on it. Since the bottom end of the lead screw 303 is connected to the bottom end of the lifting column 200, the force applied by the lifting column 200 to the lead screw 303 is mainly tensile force. The lead screw 303 is not prone to bending deformation and breakage, and has a longer service life.

[0070] It should be noted that since the working platform can adopt all the technical solutions of the lifting device in the first aspect embodiment, it has at least all the beneficial effects brought about by the technical solutions in the first aspect embodiment. These additional beneficial effects will not be elaborated here.

[0071] It is understood that other components and operations of the operating platform according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0072] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A lifting device, characterized in that, include: Support column; A rising column is slidably mounted on the support column. The lifting assembly includes a base, a lifting nut, a lead screw, and a drive structure. The base is disposed on the support column, the lifting nut is rotatably mounted on the base, the drive structure is disposed on the base and connected to the lifting nut to drive the lifting nut to rotate, the lead screw extends vertically and is threadedly connected to the lifting nut, and the bottom end of the lead screw is connected to the bottom end of the lifting column.

2. The lifting device according to claim 1, characterized in that, The driving structure includes: A worm gear is rotatably mounted on the base and coaxially connected to the lifting nut; the lead screw passes through the worm gear. A worm gear is rotatably mounted on the base and meshes with the worm wheel; the worm gear is used to connect to a motor.

3. The lifting device according to claim 2, characterized in that, The lifting assembly also includes: A safety nut is coaxially connected to the bottom end of the worm gear via a key structure and can slide vertically relative to the worm gear. The lead screw is threadedly connected to the safety nut. An indicator is provided on the base to indicate the height position of the safety nut.

4. The lifting device according to any one of claims 1 to 3, characterized in that, The support column is a hollow tube, and the lifting column is slidably inserted into the support column. The lifting device also includes a guide assembly, which includes: The mounting frame is provided on the support column and extends circumferentially along the support column; Multiple guide wheels are installed in the mounting frame and arranged circumferentially along the support column, with the sidewalls of the guide wheels fitting against the outer sidewall of the lifting column.

5. The lifting device according to claim 4, characterized in that, The guiding component also includes: Multiple guide wheel mounting plates are located on the outer or inner side of the mounting frame and arranged circumferentially along the support column, and the multiple guide wheels are respectively mounted on the multiple guide wheel mounting plates; Multiple adjustment plates are respectively clamped between the mounting frame and the multiple guide wheel mounting plates, and the guide wheel mounting plates and the adjustment plates are connected to the mounting frame by fasteners.

6. The lifting device according to claim 4, characterized in that, The guide components are provided in multiple ways and arranged vertically. The lifting device also includes a protective component, which includes: A first protective cover is fitted over the outer side of the top of the support column, and the base and one of the guide components are located inside the first protective cover; The second protective cover is fitted over the outside of the support column, and the remaining guide components are located inside the second protective cover.

7. The lifting device according to claim 6, characterized in that, The top of the lifting column is provided with a connecting plate, the bottom of the first protective cover is connected to the top of the support column, the top of the first protective cover is connected to the connecting plate, and the first protective cover can be adjusted vertically.

8. The lifting device according to any one of claims 1 to 3, characterized in that, The top of the lifting column is provided with an upper mounting base, the upper mounting base is provided with an insertion hole, the top of the lead screw passes through the insertion hole, the bottom of the lifting column is provided with a lower mounting base, and the bottom of the lead screw is hinged to the lower mounting base.

9. The lifting device according to any one of claims 1 to 3, characterized in that, The lifting column has limiting portions at both its top and bottom, and the support column has a blocking portion at its top. When the lifting column slides downward to the first state and upward to the second state, the corresponding limiting portions abut against the blocking portions to restrict the lifting column from continuing to slide; and / or, The top of the support column is equipped with a limit switch, and the top and bottom of the lifting column are equipped with contact parts. When the lifting column slides downward to the first state and upward to the second state, the limit switch contacts the corresponding contact part to control the drive structure to stop working.

10. A working platform, characterized in that, Includes the lifting device as described in any one of claims 1 to 9.

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