Automatic lifting column with nested hollow lead screw

Abstract

The automatic lifting column with the nested hollow lead screws comprises a lead screw assembly, the lead screw assembly comprises a plurality of lead screws which are coaxially nested, and the lead screws are movably provided with nuts; the hollow column assembly comprises a plurality of nested hollow columns, the nuts and the hollow columns are fixed one by one, the mutually nested hollow columns have mutual linear telescopic translation freedom degrees, and the linear telescopic direction of the hollow columns is parallel to the axis direction of the lead screw; the power transmission assembly drives the lead screw to rotate; each lead screw is provided with a hollow cavity for containing the corresponding inner adjacent lead screw, the inner wall of each hollow cavity is provided with a linear edge groove movably assembled with the corresponding inner adjacent lead screw, the linear edge grooves limit the mutual rotation freedom degree of the adjacent lead screws, and the lead screws have the mutual linear telescopic translation freedom degree in the axial direction under the guidance of the linear edge grooves. The lead screw assemblies which are telescopic in a nested mode and rotate synchronously are adopted, the overall linear telescopic translation amount is large, and the device can be applied to the fields of automatic lifting operation, robot mechanical arm extension and the like.

Description

Technical Field

[0001] The invention relates to an automated telescopic mechanism, in particular to an automated lifting column with a nested hollow lead screw. Background Art

[0002] Lifting columns are widely used in the field of automation. They are mainly retractable structures with the ends having linear lifting freedom, which can be raised to a higher area. The driving principle of this type of lifting is generally based on gears and racks, and there are also pulleys and transmission belts.

[0003] Lead screws and nut are also commonly used basic components in the field of automation. The most distinctive form of movement of lead screws and nut is to convert the rotation of the lead screw into the linear motion of the nut. If the lead screw is arranged vertically, it is equivalent to giving the nut vertical lifting freedom, but the lifting range of the nut will not exceed the length range of the lead screw. At present, there is still a lack of designs that fully utilize lead screws and nut for more automated lifting and telescopic mechanisms. Summary of the invention

[0004] The problem to be solved by the present invention is to provide an automated lifting column with a nested hollow screw, which adopts a nested telescopic but synchronously rotating screw assembly, has a large overall linear telescopic translation, and can be used in automated lifting operations, robot arm extension and other fields.

[0005] In order to solve the above problems, the present invention provides an automated lifting column with a nested hollow screw. To achieve the above objectives, the technical solution adopted by the present invention to solve the technical problems is:

[0006] An automated lifting column with a nested hollow lead screw comprises: a lead screw assembly, comprising a plurality of coaxially nested lead screws, wherein the lead screws are movably equipped with a nut; a hollow column assembly, comprising a plurality of nested hollow columns, wherein the nut and the hollow column are fixed one by one, and the mutually nested hollow columns have mutual linear telescopic and translational freedom, and the linear telescopic direction of the hollow column is parallel to the direction of the lead screw axis; a power transmission assembly, which drives the lead screw to rotate; the lead screw has a hollow cavity for accommodating adjacent lead screws inside, and the inner wall of the hollow cavity has a linear ridge groove movably assembled with the adjacent lead screws inside, the linear ridge groove limits the mutual rotational freedom of adjacent lead screws, and the lead screw has mutual linear telescopic and translational freedom along the axial direction guided by the linear ridge groove.

[0007] The beneficial effects of adopting the above technical solution are: first, it is equivalent to changing the conventional single solid screw into a nested combination of multiple nested screws, so relatively speaking, the total length of the screw assembly in the final extended state can be longer, and the total length in the retracted state can be shorter, and the overall telescopic amount is large, which can be widely used in automated lifting operations, robot arm extension and other fields.

[0008] Secondly, each hollow column is fixed to a lead screw, and the hollow column moves with the lead screw, and the hollow column plays a role of wrapping and protecting the lead screw. The lead screw assembly and the hollow column assembly can each be regarded as a nested structure. Therefore, the ratio between its longest and shortest two extreme lengths will be very large.

[0009] Thirdly, the external thread of the lead screw has a self-locking property. When the nut is subjected to a large vertical downward pressure, the nut is not easy to move downward with gravity, which is equivalent to the lifting column of this technical solution having an anti-retraction design.

[0010] Secondly, because the lateral dimension of the hollow column is destined to be larger than the lateral dimension of the screw, the main function of the hollow column is to provide lateral bending strength to prevent the extension mechanism from being distorted and damaged by external forces.

[0011] Then, compared with the pulley and transmission belt mechanism and the rack and gear mechanism, the lead screw naturally has a greater axial compressive resistance and a certain lateral bending resistance. However, after all, the lead screw's compressive resistance is relatively the largest, so a hollow column is used here as a supplement to allow the hollow column to bear more lateral bending resistance.

[0012] Finally, due to the effect of the linear grooves, there is no relative rotational freedom between the screws in the screw assembly. Although the screw assembly is composed of multiple screws, it is equivalent to a complete screw in terms of circumferential motion. Otherwise, it is difficult to extend smoothly. It is precisely by using the linear grooves to limit the circumferential rotational freedom of the screws, and at the same time, the linear grooves do not hinder the axial translation of adjacent screws, but can provide linear guidance for the axial translation of adjacent screws.

[0013] As a further improvement of the present invention, the screw assembly includes an inner screw and at least one hollow screw, the outer walls of the inner screw and the hollow screw both have external threads that are movably assembled with the nut; the interior of the hollow screw is recessed with a plurality of axial grooves extending axially, the end of the inner screw is fixed with a spline sleeve, the outer wall of the spline sleeve is protruded with a plurality of axial ridges, and the linear grooves include axial grooves and axial ridges that are movably assembled with each other.

[0014] The beneficial effect of adopting the above technical solution is that the hollow screws in the screws can be nested with each other, and the axial grooves and axial ridges can smoothly limit the circumferential motion freedom of adjacent screws. As long as one screw rotates, the multiple screws will rotate synchronously. In addition, the movable assembly form of the axial grooves and axial ridges is similar to the movable assembly form of the slider and the linear guide rail, which has good linear guidance.

[0015] As a further improvement of the present invention, a spline sleeve is fixed to the end of the inner screw away from the power transmission component; a ring nut is fixed to the end of the hollow screw away from the power transmission component, and a sealing ring is fixed to the ring nut in contact with the axial end surface of the power transmission component, and the outer diameter of the sealing ring is larger than the outer diameter of the ring nut.

[0016] The beneficial effects of adopting the above technical solution are: the ring nut plays a locking role, and the sealing ring plays an elastic sealing and buffering role.

[0017] As a further improvement of the present invention, the nut is assembled with one end of the hollow column through a platform; the platform includes a first-order platform fixed to the nut of the inner screw, and also includes a second-order platform fixed to the nut of the hollow screw; the hollow screw adjacent to the inner screw is assembled with the first-order platform through an axle ring; the axle ring includes a deep groove ball bearing assembled with the outer wall of the hollow screw; and also includes a ring nut assembled with the outer wall of the hollow screw.

[0018] The beneficial effects of adopting the above technical solution are: the nut moves axially with the rotation of the screw, and the nut pushes the connected hollow column with the help of the platform. The shaft ring plays the role of rotation limit. First, an additional reinforcement is added here to enhance the stability of the assembly of the screw and the platform; second, it does not limit the possible circumferential rotation movement of each other.

[0019] As a further improvement of the present invention, one end of the inner screw is movably equipped with a base, the inner screw and the base are assembled by at least two deep groove ball bearings, and the several deep groove ball bearings assembled with the inner screw and the base have at least two outer diameter specifications.

[0020] The beneficial effect of adopting the above technical solution is that: under the premise of ensuring that the rotation resistance is small, the multiple deep groove ball bearings have good fixing firmness to the inner screw.

[0021] As a further improvement of the present invention, a top mounting platform is vertically fixed to one end of one of the hollow columns; a sleeve is wrapped around the outside of the screw assembly, and the axial end of the sleeve is in contact and fixed with the top mounting platform; the outer ring of the sealing ring is in extrusion contact with the inner wall of the adjacent hollow screw outside or the inner wall of the sleeve.

[0022] The beneficial effects of adopting the above technical solution are: on the one hand, the sleeve protects the internal screw to prevent impurities from entering between the screw and the nut; on the other hand, the sleeve is equivalent to further adding and strengthening the structural strength between the hollow column and the screw, ensuring that the lifting column has greater pressure resistance and bending resistance after being raised.

[0023] As a further improvement of the present invention, the power transmission assembly includes a rotating motor arranged parallel to the lead screw, a driven gear is fixed to one end of the inner lead screw, a driving gear is fixed to the rotating motor, the driving gear and the driven gear are meshed with each other through an intermediate gear, and the driving gear, the intermediate gear and the driven gear are all helical gears.

[0024] The beneficial effect of adopting the above technical solution is that the rotating motor utilizes a gear transmission form to rotationally drive the lead screw, so that the rotating motor can be arranged in parallel on one side of the lead screw.

[0025] As a further improvement of the present invention, a wear-resistant sheet is fixed at the end of the inner wall of the hollow column assembly, and the front and back surfaces of the wear-resistant sheet are respectively in contact with the adjacent hollow columns, and the hardness of the wear-resistant sheet is smaller than that of the hollow column.

[0026] The beneficial effects of adopting the above technical solution are: the wear-resistant sheet ensures the minimum gap between adjacent hollow columns, thereby ensuring that only the wear-resistant sheet contacts each other during the telescopic movement of the hollow columns, thereby avoiding scratches on the hollow column body; secondly, if the hollow column has a tendency to tilt, the area where the wear-resistant sheet is located is subject to the greatest force, and the wear-resistant sheet also bears a large extrusion pressure along its thickness direction.

[0027] As a further improvement of the present invention, the inner wall of the hollow column has a linear ridge, the length direction of the linear ridge is parallel to the length direction of the hollow column, the surface of the wear-resistant sheet has a linear groove, and the hollow column and the linear groove are movably assembled with each other; the wear-resistant sheet also has a convex head protruding from the end of the hollow column.

[0028] The beneficial effect of adopting the above technical solution is that as the hollow column is extended and lifted, there is sliding friction between the wear-resistant sheet and the surface of the hollow column, and the linear groove and the linear ridge can play a good linear guiding role.

[0029] As a further improvement of the present invention, the base is also provided with a limit alarm assembly; the limit alarm assembly includes a touch rod arranged parallel to the screw, the touch rod is located in the hollow column, the limit alarm assembly is electrically connected to the power transmission assembly, and when the top end of the touch rod is contacted by the hollow column, the power transmission assembly is triggered to stop rotating.

[0030] The beneficial effect of adopting the above technical solution is that the limit alarm component can mainly prevent the lifting column from being lifted too low, thereby causing damage to the inner wall mechanism thereof. The limit alarm component can be a travel switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 is a front view of an embodiment of the present invention;

[0033] Figure 2 is an AA cross-sectional view of an embodiment of the present invention;

[0034] Figure 3 It is a partial enlarged view of point B of an embodiment of the present invention;

[0035] Figure 4 It is a partial enlarged view of position C of an embodiment of the present invention;

[0036] Figure 5 It is a partial enlarged view of position D of an embodiment of the present invention;

[0037] Figure 6 is an EE cross-sectional view of an embodiment of the present invention;

[0038] Figure 7 It is a partial enlarged view of location I of an embodiment of the present invention;

[0039] Figure 8 It is a stereoscopic diagram of a first-order platform, a second-order platform, and an external lead screw in one embodiment of the present invention;

[0040] Fig. 9 It is a partial enlarged view of point F of an embodiment of the present invention;

[0041] Fig.10 It is a three-dimensional diagram of an outer hollow column and a hollow column in one embodiment of the present invention;

[0042] Fig.11 It is a partial enlarged view of the H portion of an embodiment of the present invention;

[0043] Fig.12 is a stereoscopic view of an outer lead screw according to an embodiment of the present invention;

[0044] Fig.13 is a stereoscopic diagram of an inner screw according to an embodiment of the present invention;

[0045] Fig.14 is a three-dimensional diagram of a hollow column according to an embodiment of the present invention;

[0046] Fig.15is a stereoscopic diagram of a power transmission assembly and a lead screw assembly according to an embodiment of the present invention;

[0047] Fig.16 is a perspective view of an embodiment of the present invention;

[0048] Fig.17 It is a perspective view of an embodiment of the present invention.

[0049] 1-rotating motor; 2-base; 3-driving gear; 4-intermediate gear; 5-driven gear; 6-limit alarm assembly; 7-touch rod; 8-outer hollow column; 9-middle hollow column; 10-inner hollow column; 101-rectangular cavity; 102-linear ridge; 11-top mounting platform; 12-sleeve; 13-first-stage platform; 131-positioning pit; 14-second-stage platform; 15-outer screw; 151-middle Cavity; 152-axial groove; 16-internal screw; 17-ring nut; 18-spline sleeve; 181-axial ridge; 19-sealing ring; 20-screw; 21-deep groove ball bearing; 22-external nut; 23-internal nut; 24-shaft collar; 25-silicone gasket; 26-flat key; 27-first wear-resistant plate; 271-convex head; 28-second wear-resistant plate; 281-linear slot; 29-frame member. DETAILED DESCRIPTION

[0050] The present invention is further described in detail below in conjunction with specific embodiments:

[0051] In order to achieve the purpose of the present invention, an automated lifting column with a nested hollow screw comprises: a screw assembly, comprising a plurality of coaxially nested screws, which are movably equipped with a nut; a hollow column assembly, comprising a plurality of nested hollow columns, the nuts are fixed to the hollow columns one by one, the nested hollow columns have mutual linear telescopic and translational freedom, and the linear telescopic direction of the hollow columns is parallel to the axis direction of the screw; a power transmission assembly, driving the screw to rotate; the screw has a hollow cavity 151 for accommodating adjacent screws inside, the inner wall of the hollow cavity 151 has a linear ridge groove movably assembled with the adjacent screws inside, the linear groove limits the mutual rotational freedom of adjacent screws, and the screw has mutual linear telescopic and translational freedom along the axial direction guided by the linear groove.

[0052] The beneficial effects of adopting the above technical solution are: first, it is equivalent to changing the conventional single solid lead screw into a nested combination of multiple nested lead screws, so the total length of the lead screw assembly in the final extended state can be relatively long, and the total length in the contracted state can be relatively short, and the overall telescopic amount is large, which can be widely used in the fields of automated lifting operations, robot arm extension, etc. Secondly, each hollow column corresponds to a lead screw, and the hollow column moves with the lead screw, and the hollow column plays a wrapping and protective role on the lead screw. The lead screw assembly and the hollow column assembly can each be regarded as a nested structure. Therefore, the ratio between its longest and shortest two limit lengths will be very large. Thirdly, the external thread of the lead screw has a self-locking characteristic. When the nut is subjected to a large vertical downward pressure, the nut is not easy to move downward with gravity, which is equivalent to the lifting column of the technical solution having an anti-retraction design. From this, because the lateral size of the hollow column is destined to be larger than the lateral size of the lead screw, the main function of the hollow column is to provide lateral bending structural strength to prevent the extension mechanism from being skewed and damaged by external forces. Then, compared with the pulley and transmission belt mechanism and the rack and gear mechanism, the lead screw naturally has a greater axial compressive resistance and a certain lateral bending resistance. However, after all, the lead screw has the largest compressive resistance, so a hollow column is used here as a supplement to allow the hollow column to bear more lateral bending resistance. Finally, due to the effect of the linear grooves, there is no freedom of relative rotation between the screws in the screw assembly. Although the screw assembly is composed of multiple screws, it is equivalent to a complete integrated screw in terms of circumferential movement. Otherwise, it is difficult to extend smoothly. It is precisely by using the linear grooves to limit the circumferential rotational freedom of the screws, and at the same time, the linear grooves do not hinder the axial translation of adjacent screws, but can provide linear guidance for the axial translation of adjacent screws.

[0053] like Figure 3 As shown, the hollow column assembly includes an outer hollow column 8, a middle hollow column 9, and an inner hollow column 10 from the outside to the inside, wherein the outer hollow column 8, the middle hollow column 9, and the inner hollow column 10 have gradually smaller thicknesses, and the outer hollow column 8, the middle hollow column 9, and the inner hollow column 10 can all be profiles, and the outer wall cross-sectional contours of the outer hollow column 8, the middle hollow column 9, and the inner hollow column 10 are approximately square.

[0054] In other embodiments of the present invention, the screw assembly includes an inner screw 16 and at least one hollow screw, and the outer walls of the inner screw 16 and the hollow screw are provided with external threads that are movably assembled with the nut; the interior of the hollow screw is recessed with a plurality of axially extending axial grooves 152, and a spline sleeve 18 is fixed at the end of the inner screw 16, and a plurality of axial ridges 181 are protruded from the outer wall of the spline sleeve 18, and the linear grooves include the axial grooves 152 and the axial ridges 181 that are movably assembled with each other.

[0055] The beneficial effect of adopting the above technical solution is that the hollow screws in the screws can be nested with each other, and the axial grooves and axial ridges can smoothly limit the circumferential motion freedom of adjacent screws. As long as one screw rotates, the multiple screws will rotate synchronously. In addition, the movable assembly form of the axial grooves and axial ridges is similar to the movable assembly form of the slider and the linear guide rail, which has good linear guidance.

[0056] The hollow screw is the outer screw 15 . The screw assembly includes an inner screw 16 and an outer screw 15 which are nested with each other. The outer screw 15 is hollow inside to form a hollow cavity 151 . A plurality of axial grooves 152 are distributed in a circular array on the inner wall of the outer screw 15 .

[0057] The inner screw 16 is movably assembled with the inner screw 23, and the outer screw 15 is movably assembled with the outer screw 22.

[0058] The pitch of the external threads on the outer walls of the inner lead screw 16 and the hollow lead screw (ie, the outer lead screw 15) in the lead screw are equal, and the spiral direction of the external threads is also the same.

[0059] In other embodiments of the present invention, the spline sleeve 18 is fixed to the end of the inner screw away from the power transmission component; a ring nut 17 is fixed to the end of the hollow screw away from the power transmission component, and a sealing ring 19 is fixed to the ring nut 17 in contact with the axial end surface of the power transmission component, and the outer diameter of the sealing ring 19 is larger than the outer diameter of the ring nut 17.

[0060] The beneficial effects of adopting the above technical solution are: the ring nut plays a locking role, and the sealing ring plays an elastic sealing and buffering role.

[0061] like Fig.13 As shown, the axial length of the spline sleeve 18 is longer than the axial length of the ring nut 17 .

[0062] like Figure 4 As shown, the inner screw 16 is a solid screw, and one end of the inner screw 16 fixes the spline sleeve 18 to the inner screw 16 via a coaxially arranged screw 20 .

[0063] In some other embodiments of the present invention, the nut is assembled with one end of the hollow column through a platform; the platform includes a first-order platform 13 fixed to the nut of the inner screw 16, and also includes a second-order platform 14 fixed to the nut of the hollow screw; the hollow screw adjacent to the inner screw 16 is assembled with the first-order platform 13 through a shaft ring 24; the shaft ring 24 includes a deep groove ball bearing 21 assembled with the outer wall of the hollow screw; and also includes a ring nut 17 assembled with the outer wall of the hollow screw.

[0064] The beneficial effects of adopting the above technical solution are: the nut moves axially with the rotation of the screw, and the nut pushes the connected hollow column with the help of the platform. The shaft ring plays the role of rotation limit. First, an additional reinforcement is added here to enhance the stability of the assembly of the screw and the platform; second, it does not limit the possible circumferential rotation movement of each other.

[0065] In some other embodiments of the present invention, one end of the inner screw 16 is movably assembled with a base 2, and the inner screw 16 and the base 2 are assembled by at least two deep groove ball bearings 21, and the several deep groove ball bearings 21 assembled with the inner screw 16 and the base 2 have at least two outer diameter specifications.

[0066] The beneficial effect of adopting the above technical solution is that: under the premise of ensuring that the rotation resistance is small, the multiple deep groove ball bearings have good fixing firmness to the inner screw.

[0067] In some other embodiments of the present invention, a top mounting platform 11 is vertically fixed to one end of a hollow column; Fig.15 As shown, the outside of the screw assembly is wrapped with a sleeve 12, and the axial end of the sleeve 12 is in contact and fixed with the top mounting platform 11; the outer ring of the sealing ring 19 is in elastic extrusion contact with the inner wall of the adjacent hollow screw outside or the inner wall of the sleeve 12.

[0068] The beneficial effects of adopting the above technical solution are: on the one hand, the sleeve protects the internal screw to prevent impurities from entering between the screw and the nut; on the other hand, the sleeve is equivalent to further adding and strengthening the structural strength between the hollow column and the screw, ensuring that the lifting column has greater pressure resistance and bending resistance after being raised.

[0069] A top mounting platform 11 is fixed to one end of the inner hollow column 10 , and the top mounting platform 11 seals one end of the inner hollow column 10 .

[0070] In some other embodiments of the present invention, the power transmission assembly includes a rotating motor 1 arranged parallel to the lead screw, a driven gear 5 is fixed to one end of the internal lead screw 16, a driving gear 3 is fixed to the rotating motor 1, the driving gear 3 and the driven gear 5 are meshed with each other through an intermediate gear 4, and the driving gear 3, the intermediate gear 4, and the driven gear 5 are all helical gears.

[0071] The beneficial effect of adopting the above technical solution is that the rotating motor utilizes a gear transmission form to rotationally drive the lead screw, so that the rotating motor can be arranged in parallel on one side of the lead screw.

[0072] like Figure 5 As shown, the inner screw 16 is also covered with a silicone gasket 25 , and the axial end surface of one side of the silicone gasket 25 contacts the top surface of the base 2 .

[0073] like Figure 5As shown, a flat key 26 is fixed on the circumferential surface of one end of the inner screw 16, and the inner screw 16 is assembled with the driven gear 5 through the flat key 26. There is no freedom of rotation between the inner screw 16 and the driven gear 5 in the circumferential direction.

[0074] In other embodiments of the present invention, a wear-resistant sheet is fixed at the end of the inner wall of the hollow column assembly, the front and back surfaces of the wear-resistant sheet are in contact with the adjacent hollow columns respectively, and the hardness of the wear-resistant sheet is lower than that of the hollow column.

[0075] The beneficial effects of adopting the above technical solution are: the wear-resistant sheet ensures the minimum gap between adjacent hollow columns, thereby ensuring that only the wear-resistant sheet contacts each other during the telescopic movement of the hollow columns, thereby avoiding scratches on the hollow column body; secondly, if the hollow column has a tendency to tilt, the area where the wear-resistant sheet is located is subject to the greatest force, and the wear-resistant sheet also bears a large extrusion pressure along its thickness direction.

[0076] The wear-resistant sheet can be made of rubber. The wear-resistant sheet is divided into a first wear-resistant sheet 27 and a second wear-resistant sheet 28 according to the arrangement position. The first wear-resistant sheet 27 is arranged at the corner of the hollow column.

[0077] The first wear-resistant sheet 27 and the second wear-resistant sheet 28 both have convex heads 271. One side of the first wear-resistant sheet 27 also has a checkered concave-convex pattern, which can improve the elastic force of the first wear-resistant sheet 27 in the thickness direction.

[0078] A circle of frame-shaped parts 29 is fixed to the top edges of the outer hollow column 8 and the inner hollow column 9 , and the frame-shaped parts 29 strengthen the structural strength and dimensional stability of the top edges of the outer hollow column 8 and the inner hollow column 9 .

[0079] When the protrusion 271 of the wear-resistant sheet extends downward, Figure 8 , Fig.17 As shown, the first-stage platform 13 and the second-stage platform are provided with positioning pits 131 around their edges for docking with the protrusions 271 extending downward.

[0080] When the convex head 271 of the wear-resistant sheet extends upward, Figure 3 , Fig.11 As shown, the frame member 29 can be assembled and fixed with the protrusion 271 extending upward.

[0081] In other embodiments of the present invention, the inner wall of the hollow column has a linear ridge 102, the length direction of the linear ridge 102 is parallel to the length direction of the hollow column, the surface of the wear-resistant sheet has a linear groove 281, and the hollow column and the linear groove 281 are movably assembled with each other; the wear-resistant sheet also has a protrusion 271 protruding from the end of the hollow column.

[0082] The beneficial effect of adopting the above technical solution is that as the hollow column is extended and lifted, there is sliding friction between the wear-resistant sheet and the surface of the hollow column, and the linear groove and the linear ridge can play a good linear guiding role.

[0083] In some other embodiments of the present invention, the base 2 is also provided with a limit alarm assembly 6; the limit alarm assembly 6 includes a touch rod 7 arranged parallel to the screw, the touch rod 7 is located in the hollow column, the limit alarm assembly 6 is electrically connected to the power transmission assembly, and when the top end of the touch rod 7 is contacted by the hollow column, the power transmission assembly is triggered to stop rotating.

[0084] The beneficial effect of adopting the above technical solution is that the limit alarm component can mainly prevent the lifting column from being lifted too low, thereby causing damage to the inner wall mechanism thereof. The limit alarm component can be a travel switch.

[0085] The limit alarm 6 can be a kind of contact switch. The limit alarm 6 includes a compression spring assembled with the touch rod 7. The length direction of the touch rod 7 is also parallel to the length direction of the screw. The touch rod 7 has elastic telescopic freedom along its own length direction. When the hollow column assembly retracts to a certain extent, the end of the touch rod 7 contacts the top mounting platform 11, thereby triggering the rotating motor 1 to stop rotating and stop the further retraction of the hollow column assembly, thereby limiting the shortest limit length of the hollow column assembly in the retracted state, avoiding collision between components in the automated lifting column of the present technical solution, and achieving a protective effect.

[0086] like Figure 2 As shown, there are two screws, one solid screw and one hollow screw, namely, inner screw 16 and outer screw 15. There are three lifting columns, namely, outer hollow column 8, middle hollow column 9 and inner hollow column 10. When the lifting column is fully extended, the outer hollow column 8 is still at the bottom, which is relatively limited.

[0087] According to the technical ideas shown in the previous paragraph, when there is a need, the number of lead screws and lifting columns can be unlimited. For example, there can be three lead screws nested in each other, at least two of which are hollow lead screws. The innermost lead screw does not have to be solid. For structural strength considerations, the innermost lead screw is generally solid. For example, when there are three lead screws, there are four lifting columns, and there is still one lifting column at the bottom. By analogy, the number of lead screws and lifting columns can continue to increase, corresponding to the entire automated lifting column mechanism, the ratio of its maximum extension length to its minimum retracted length is greater.

[0088] In addition, although the main working state of the present technical solution is in the vertical direction, the lifting and telescopic principle of its structure does not rely on gravity. Therefore, when necessary, the main body of the present technical solution can also be arranged obliquely or horizontally, and also output linear reciprocating motion, achieving an effect similar to that of a telescopic arm.

[0089] In order to facilitate the display of internal structure, Fig.17 compared to Fig.16 , Fig.17 The outer hollow column 8 is hidden. In addition, Figure 1 and Fig.16 This is the complete product status of this application, and no components are hidden.

[0090] In order to conveniently show the layout and principle of the first wear-resistant sheet 27 and the second wear-resistant sheet 28, Fig.10 The inner hollow column 10 is hidden. Fig.17 The outer hollow column 8 is then hidden.

[0091] In order to conveniently show the layout and principle of the outer screw 15 and the inner screw 16, Fig.13 yes Fig.12 The outer lead screw 15 is further hidden on the basis of Fig.15 The sleeve 12 in the middle wraps the outer lead screw 15 and the inner lead screw 16 inside.

[0092] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An automated lifting column with a nested hollow screw, characterized in that: include: The lead screw assembly comprises a plurality of coaxially nested lead screws, wherein the lead screws are movably equipped with a screw nut; The hollow column assembly comprises a plurality of nested hollow columns, wherein the nut and the hollow columns are fixed one by one, and the mutually nested hollow columns have mutual linear telescopic and translational freedom, and the linear telescopic direction of the hollow column is parallel to the direction of the screw axis; A power transmission assembly drives the lead screw to rotate; The screw has a hollow cavity for accommodating adjacent internal screws, and the inner wall of the hollow cavity has linear grooves that are movably assembled with the adjacent internal screws. The linear grooves limit the mutual rotational freedom of adjacent screws, and the screws have mutual linear telescopic and translational freedom along the axial direction guided by the linear grooves.

2. The automated lifting column with a nested hollow screw according to claim 1, characterized in that: The screw assembly includes an inner screw and at least one hollow screw, and the outer walls of the inner screw and the hollow screw are both provided with external threads movably assembled with the nut; The hollow screw has a plurality of axially extending axial grooves recessed inside, a spline sleeve is fixed to the end of the inner screw, a plurality of axial ridges protrude from the outer wall of the spline sleeve, and the linear groove includes axial grooves and axial ridges movably assembled with each other.

3. The automated lifting column with a nested hollow screw according to claim 2, characterized in that: The spline sleeve is fixed to the end of the inner screw away from the power transmission component; a ring nut is fixed to the end of the hollow screw away from the power transmission component, and a sealing ring is fixed to the ring nut in contact with the axial end surface of the power transmission component, and the outer diameter of the sealing ring is larger than the outer diameter of the ring nut.

4. The automated lifting column with a nested hollow screw according to claim 2, characterized in that: The nut is assembled with one end of the hollow column through a platform; the platform includes a first-order platform fixed to the nut of the inner screw, and also includes a second-order platform fixed to the nut of the hollow screw; The hollow lead screw adjacent to the inner lead screw and the first-stage platform are assembled via a shaft collar; The shaft ring includes a deep groove ball bearing assembled with the outer wall of the hollow lead screw; and also includes a ring nut assembled with the outer wall of the hollow lead screw.

5. The automated lifting column with a nested hollow screw according to claim 2, characterized in that: One end of the inner screw is movably equipped with a base, and the inner screw and the base are assembled through at least two deep groove ball bearings. The deep groove ball bearings assembled with the inner screw and the base have at least two outer diameter specifications.

6. The automated lifting column with a nested hollow screw according to claim 3, characterized in that: A top mounting platform is vertically fixed to one end of one of the hollow columns; a sleeve is wrapped around the outside of the lead screw assembly, and the shaft end of the sleeve is in contact and fixed with the top mounting platform; The outer ring of the sealing ring is in compression contact with the inner wall of the outer adjacent hollow screw or the inner wall of the sleeve.

7. The automated lifting column with a nested hollow screw according to claim 2, characterized in that: The power transmission assembly includes a rotating motor arranged in parallel with the lead screw, a driven gear is fixed to one end of the inner lead screw, a driving gear is fixed to the rotating motor, the driving gear and the driven gear are meshed with each other through an intermediate gear, and the driving gear, the intermediate gear and the driven gear are all helical gears.

8. The automated lifting column with a nested hollow screw according to claim 1, characterized in that: A wear-resistant sheet is fixed at the end of the inner wall of the hollow column assembly, and the front and back surfaces of the wear-resistant sheet are in contact with the adjacent hollow columns respectively. The hardness of the wear-resistant sheet is lower than that of the hollow column.

9. The automated lifting column with a nested hollow screw according to claim 8, characterized in that: The inner wall of the hollow column has a linear ridge, the length direction of the linear ridge is parallel to the length direction of the hollow column, the surface of the wear-resistant sheet has a linear groove, and the hollow column and the linear groove are movably assembled with each other; The wear-resistant sheet is also provided with a convex head emerging from the end of the hollow column.

10. The automated lifting column with a nested hollow screw according to claim 5, characterized in that: The base is also provided with a limit alarm component; the limit alarm component includes a touch rod arranged parallel to the screw, the touch rod is located in the hollow column, the limit alarm component is electrically connected to the power transmission component, and when the top end of the touch rod is contacted by the hollow column, the power transmission component is triggered to stop rotating.

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