Lifting device of electric lifting furniture

Abstract

The utility model discloses a lifting device of electric lifting furniture, which comprises a first tubular part, a second tubular part and a compensation element, a sliding surface is arranged on the outer side of the compensation element, a fixed bulge and a hot melting bulge are arranged on the inner side of the compensation element, a mounting hole is arranged on the second tubular part, and the sliding surface is arranged on the mounting hole. The fixing protrusion is inserted into the mounting hole so that the compensation element can be attached to the outer side face of the second tubular part in the axial direction of the second tubular part, and the hot melting protrusion is heated to generate plastic deformation to present the shape corresponding to the outer surface of the second tubular part. The gap between the first tubular part and the second tubular part is filled through the compensation element, compensation elements of different sizes do not need to be prepared, the assembly difficulty is greatly reduced, and the compensation element is attached to the outer side face of the second tubular part in the axial direction of the second tubular part, so that the assembly difficulty is greatly reduced. Therefore, the installation position of the compensation element is not affected by the shape of the second tubular part, and the application range is wider.

Description

Technical Field

[0001] The utility model belongs to the field of lifting equipment, and in particular relates to a lifting device for electric lifting furniture. Background Art

[0002] With the improvement of living standards, electric lift furniture is being used more and more widely. The lifting device of electric lift furniture usually includes two or more telescopic tubes, which are connected to each other to form a lifting structure that can be extended and retracted under the push of a driving structure.

[0003] In order to prevent the lifting structure from shaking during the extension and retraction process due to the gap between the two telescopic tubes, a compensating element such as a sliding sleeve is usually provided between the two telescopic tubes to fill the gap. However, since the telescopic tube is usually an extruded profile or a rolled and longitudinally welded hollow profile, it has a large manufacturing tolerance, resulting in an unstable gap between the two telescopic tubes. It is necessary to prepare compensating elements of different sizes for multiple installation attempts until a compensating element suitable for the gap between the two telescopic tubes to be assembled is found, which makes assembly difficult and the production cost high. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a lifting device for electric lifting furniture to solve the problem of low assembly efficiency of the lifting device.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: a lifting device for electric lifting furniture, comprising: a first tubular component; and a second tubular component, which is nested in the first tubular component and can slide axially relative to the first tubular component; and a compensation element, which is arranged between the first tubular component and the second tubular component to compensate for the gap between the two; the compensation element has an inner side facing the second tubular component and an outer side facing the first tubular component, the outer side of the compensation element is provided with a sliding surface contacting the inner surface of the first tubular component, the inner side of the compensation element is provided with a fixing protrusion and a hot-melt protrusion, and the second tubular component is provided with a mounting hole, the fixing protrusion is inserted into the mounting hole so that the compensation element is attached to the outer side surface of the second tubular component along the axial direction of the second tubular component, the second tubular component forces the compensation element to bend outward to maintain a pre-tightened state, thereby keeping the fixing protrusion clamping the second tubular component, and the hot-melt protrusion is plastically deformed by heat to present a shape corresponding to the outer surface of the second tubular component.

[0006] In the lifting device of the electric lifting furniture, the outer side surface of the second tubular component extends axially straight, and the compensation element is bent when not installed. The second tubular component forces the compensation element to bend outward and approach straightness.

[0007] In the lifting device of the above-mentioned electric lifting furniture, a first fixing protrusion is provided at the inner upper end of the compensation element, a second fixing protrusion is provided at the inner lower end of the compensation element, a first mounting hole and a second mounting hole are axially spaced apart on the second tubular component, the first fixing protrusion is inserted into the first mounting hole, and the second fixing protrusion is inserted into the second mounting hole, and the pre-tightened state of the compensation element causes the first fixing protrusion and the second fixing protrusion to clamp the second tubular component in a direction toward each other.

[0008] In the lifting device of the above-mentioned electric lifting furniture, a first guiding slope and a second guiding slope are provided on the outer side of the compensation element. The first guiding slope transitions from the upper end of the compensation element to the sliding surface, and the second guiding slope transitions from the lower end of the compensation element to the sliding surface.

[0009] In the lifting device of the above-mentioned electric lifting furniture, the hot-melt protrusion gradually shrinks from its root toward the free end.

[0010] In the lifting device of the electric lifting furniture, the fixing protrusion includes a first convex rib and a second convex rib cross-connected with each other.

[0011] In the lifting device of the above-mentioned electric lifting furniture, a plurality of hot-melt protrusions are dispersedly distributed on the inner side of the compensation element, and the plurality of hot-melt protrusions diffuse toward the gaps between each other when they are plastically deformed by heat.

[0012] In the lifting device of the above-mentioned electric lifting furniture, the hot-melt protrusion is in the shape of a convex point, a rib, or a block.

[0013] In the above-mentioned lifting device of the electric lifting furniture, the hot-melt protrusion has a lower melting point than the compensation element and the fixing protrusion.

[0014] In the above-mentioned lifting device of electric lifting furniture, at least two rows of compensation elements are arranged between the first tubular component and the second tubular component at intervals along the axial direction.

[0015] The beneficial effects of the utility model are:

[0016] The lifting device of electric lifting furniture includes: a first tubular component; and a second tubular component, which is nested in the first tubular component and can slide axially relative to the first tubular component; and a compensation element, which is arranged between the first tubular component and the second tubular component to compensate for the gap between the two; the compensation element has an inner side facing the second tubular component and an outer side facing the first tubular component, the outer side of the compensation element is provided with a sliding surface that contacts the inner surface of the first tubular component, the inner side of the compensation element is provided with a fixing protrusion and a hot-melt protrusion, and the second tubular component is provided with a mounting hole, the fixing protrusion is inserted into the mounting hole so that the compensation element is attached to the outer side surface of the second tubular component along the axial direction of the second tubular component, and the second tubular component forces the compensation element to bend outward to maintain a pre-tightened state, thereby keeping the fixing protrusion clamped on the second tubular component, and the hot-melt protrusion is plastically deformed by heat to present a shape corresponding to the outer surface of the second tubular component. This technical solution has the following technical effects:

[0017] The utility model arranges the compensating element between the first tubular component and the second tubular component into a structure with a fixing protrusion, so that during installation, the compensating element can be inserted into the mounting hole on the second tubular component through the fixing protrusion, so as to realize its rapid positioning and installation on the second tubular component, thereby reducing the difficulty of assembly. At the same time, the plug-in fixing protrusion and mounting hole can limit the compensating element in the axial and circumferential directions. By setting the compensating element as a deformable structure, during the process of installing the compensating element on the second tubular component, the compensating element extends along the axial direction of the second tubular component, and the outer side surface of the second tubular component forces the compensating element to bend outward to maintain a pre-tightened state. The outward-bent compensating element is reset in the direction of the second tubular component under the action of its own elastic force, so that the fixing protrusion provided on the compensating element presses the inner wall of the mounting hole, thereby keeping the compensating element in a state of clamping the second tubular component to maintain the stable installation of the compensating element on the second tubular component, avoiding the compensating element being pushed by the first tubular component when the first tubular component is subsequently sleeved and axially or circumferentially moving on the outer surface of the second tubular component. The compensating element compensates for the gap between the first tubular component and the second tubular component to prevent the two from shaking during the lifting process. Because a hot-melt protrusion that abuts against the second tubular component is provided on the inner side of the compensation element, the second tubular component is heated before the first tubular component is sleeved. The high-temperature second tubular component can melt the hot-melt protrusion attached to the outer surface of the second tubular component. At this time, the first tubular component is sleeved on the outer side of the second tubular component. The first tubular component can push the compensation element toward the second tubular component, so that the hot-melt protrusion that is melted by heat is squeezed into the space around it and plastically deforms, so that the inner side of the compensation element extends axially along the outer surface of the second tubular component to fit the outer surface of the second tubular component, thereby increasing the contact area between the second tubular component and the compensation element, and improving the supporting stability between the compensation element and the second tubular component. At the same time, by melting and squeezing the hot-melt protrusion, the distance between the hot-melt protrusion and the compensation element can be reduced. The length between one end of the first tubular component and one end installed on the compensating element makes the inner wall of the first tubular component abut against the sliding surface while the second tubular component abuts against the hot-melt protrusion, thereby ensuring that the compensating element accurately fills the gap between the first tubular component and the second tubular component. There is no need to prepare compensating elements of different sizes according to the different gaps between the first tubular component and the second tubular component, and there is no need to make multiple attempts to install between the first tubular component and the second tubular component, which greatly reduces the difficulty of assembly, improves the assembly efficiency, and reduces the production cost. Because the compensating element is attached to the outer surface of the second tubular component along the axial direction of the second tubular component, the installation position of the compensating element will not be affected by the shape of the second tubular component, and can be matched with the outer side wall of the second tubular component (such as a square tube or a round tube lamp) with an arbitrary cross-section, so it has a wider range of applications and high versatility.

[0018] The outer side surface of the second tubular component extends straight in the axial direction. The compensating element is bent when not installed. The second tubular component forces the compensating element to bend outward and approach straightness. When the compensating element is installed on the second tubular component, the second tubular component forces the compensating element to bend outward so that the compensating element approaches straightness in the axial direction. The compensating element that is bent in the axial direction has a larger deformation amount along the radial direction of the second tubular component, so that when the first tubular component and the second tubular component are assembled, the compensating element has a better effect of compensating the gap between the first tubular component and the second tubular component.

[0019] The inner upper end of the compensation element is provided with a first fixing protrusion, the inner lower end of the compensation element is provided with a second fixing protrusion, the second tubular component is axially spaced apart from the first mounting hole and the second mounting hole, the first fixing protrusion is inserted into the first mounting hole, the second fixing protrusion is inserted into the second mounting hole, and the pre-tightened state of the compensation element causes the first fixing protrusion and the second fixing protrusion to clamp the second tubular component in a direction of approaching each other. By arranging the first fixing protrusion and the second fixing protrusion at the upper and lower ends of the compensation element, the first fixing protrusion and the second fixing protrusion have a good clamping effect on the second tubular component, so as to prevent the compensation element from being disengaged from the second tubular component along the radial direction of the second tubular component.

[0020] The outer side of the compensation element is provided with a first guiding bevel and a second guiding bevel, the first guiding bevel transitions from the upper end of the compensation element to the sliding surface, and the second guiding bevel transitions from the lower end of the compensation element to the sliding surface. When installing the first tubular component and the second tubular component, the first guiding bevel or the second guiding bevel can guide the end of the first tubular component to guide the first tubular component to be smoothly sleeved with the second tubular component, without the need to accurately align the first tubular component and the second tubular component, thereby reducing the difficulty of assembly.

[0021] The hot-melt protrusion gradually shrinks from its root toward the free end, reducing the amount of material used in the end where the hot-melt protrusion abuts the second tubular component. When the first tubular component is sleeved on the outside of the second tubular component, the second tubular component can melt and squeeze the end of the hot-melt protrusion more quickly, so that the hot-melt protrusion can deform quickly. The melting process is fast and controllable, and the hot-melt protrusion can better cooperate with the outer side surface of the second tubular component to adapt to the outer contour of the second tubular component.

[0022] The fixing protrusion includes a cross-connected first rib and a second rib. The cross-connected first rib and the second rib can increase the contact area between the compensation element and the mounting hole and the strength of the fixing protrusion when limiting the compensation element in the horizontal and vertical directions, so that the abutment between the fixing protrusion and the inner wall of the mounting hole is tighter and more reliable, thereby avoiding the fixing protrusion from breaking.

[0023] In the lifting device of the electric lifting furniture, a plurality of hot melt protrusions are dispersedly distributed on the inner side of the compensation element, and the plurality of hot melt protrusions diffuse toward the gaps between each other when they are heated and plastically deformed. When the hot melt protrusions are heated and plastically deformed, the melted parts diffuse toward the peripheral side, that is, the deformed parts of the plurality of hot melt protrusions diffuse toward the gaps between each other, filling the gap between the inner side of the compensation element and the outer side wall of the second tubular component to increase the contact surface, while preventing the deformed parts of the hot melt protrusions from overflowing between the compensation element and the second tubular component, which is more beautiful.

[0024] The hot-melt protrusion has a lower melting point than the compensation element and the fixed protrusion. When the end of the hot-melt protrusion is heated and melted, the compensation element and the fixed protrusion with a higher melting point will not melt, thereby preventing the compensation element and the fixed protrusion from deforming uncontrollably, thereby ensuring that the compensation element stably compensates for the gap between the first tubular component and the second tubular component.

[0025] At least two rows of compensation elements are arranged between the first tubular component and the second tubular component at intervals along the axial direction. The compensation elements are supported at multiple points in the axial direction, so that the compensation elements between the first tubular component and the second tubular component have a better supporting effect on the first tubular component and the second tubular component, thereby preventing the first tubular component and the second tubular component from shaking during the lifting process.

[0026] The features and advantages of the present invention will be disclosed in detail in the following specific implementations and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:

[0028] Figure 1 It is a top view of the lifting device of the electric lifting furniture of the utility model;

[0029] Figure 2 for Figure 1 A magnified view of part A;

[0030] Figure 3 It is an exploded view of the lifting device of the electric lifting furniture of the utility model;

[0031] Figure 4 is a schematic diagram of the assembly of the second tubular component and the compensation element;

[0032] Figure 5 The three-dimensional compensation element Figure 1 ;

[0033] Figure 6 The three-dimensional compensation element Figure 2 .

[0034] Reference numerals:

[0035] 100. A first tubular member;

[0036] 200, second tubular member; 210, mounting hole; 211, first mounting hole; 212, second mounting hole;

[0037] 300, compensation element; 310, sliding surface; 320, fixing protrusion; 321, first fixing protrusion; 322, second fixing protrusion; 323, first rib; 324, second rib; 330, hot melt protrusion; 340, first guide slope; 350, second guide slope. DETAILED DESCRIPTION

[0038] The following is an explanation and description of the technical scheme of the embodiment of the utility model in conjunction with the drawings of the embodiment of the utility model, but the following embodiment is only a preferred embodiment of the utility model, not all. Based on the embodiment in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the utility model.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] Embodiment 1:

[0044] Lifting device for electric lift furniture, such as Figures 1 to 6 As shown, the first tubular component 100, the second tubular component 200 and the compensating element 300 are included. The first tubular component 100 is sleeved on the outside of the second tubular component 200, and the first tubular component 100 and the second tubular component 200 can slide relative to each other in the axial direction to achieve telescoping. The compensating element 300 is arranged between the first tubular component 100 and the second tubular component 200 to compensate for the gap between the inner wall of the first tubular component 100 and the outer wall of the second tubular component 200. The compensating element 300 has an inner side arranged facing the second tubular component 200, and also has an outer side arranged facing the first tubular component 100. The inner side of the compensating element 300 is fixed on the second tubular component 200. A sliding surface 310 is arranged on the outer side of the compensating element 300. The sliding surface 310 contacts the inner surface of the first tubular component 100. When the first tubular component 100 and the second tubular component 200 slide relative to each other in the axial direction, the sliding surface 310 slides axially on the inner surface of the first tubular component 100.

[0045] A fixing protrusion 320 and a hot-melt protrusion 330 are provided on the inner side of the compensation element 300, and a mounting hole 210 penetrating the wall of the second tubular component 200 is provided. During installation, the fixing protrusion 320 is inserted into the mounting hole 210 so that the compensation element 300 is attached to the outer side of the second tubular component 200. At this time, the hot-melt protrusion 330 abuts against the outer side of the second tubular component 200. Since the outer side of the second tubular component 200 is straight in the axial direction, during installation, the compensation element 300 is moved along the second tubular component 200. The tubular component 200 extends in the axial direction, and the outer side surface of the second tubular component 200 forces the compensation element 300 to bend outward to maintain the pre-tightened state. The outward-bent compensation element 300 is reset in the direction of the second tubular component 200 under the action of its own elastic force, so that the fixing protrusion 320 provided on the compensation element 300 presses the inner wall of the mounting hole 210, thereby keeping the compensation element 300 in a state of clamping the second tubular component 200, so as to maintain the stable installation of the compensation element 300 on the second tubular component 200. After the compensation element 300 is installed, the second tubular component 200 is heated, and the hot-melt protrusion 330 attached to the outer surface of the second tubular component 200 is melted by the high-temperature second tubular component 200. Then, the first tubular component 100 is sleeved on the outer side of the second tubular component 200 so that the sliding surface 310 of the compensation element 300 is against the inner surface of the first tubular component 100. During the assembly process of the first tubular component 100 and the second tubular component 200, the first tubular component 100 presses the compensation element 300 toward the second tubular component 200 by abutting against the sliding surface 310 of the compensation element 300. The melted hot-melt protrusion 330 is heated by the first tubular component 100 and the second tubular component 200. The extrusion of the second tubular member 200 causes plastic deformation to the space around it, so as to reduce the length between the end where the hot melt protrusion 330 is installed on the compensation element 300 and the end away from the compensation element 300, so that the inner wall of the first tubular member 100 abuts against the sliding surface 310, and the outer wall of the second tubular member 200 abuts against the hot melt protrusion 330, so as to ensure that the compensation element 300 accurately fills the gap between the first tubular member 100 and the second tubular member 200, so that the inner side of the compensation element 300 extends along the axial direction of the outer surface of the second tubular member 200 to fit the outer surface of the second tubular member 200, and increases the contact area between the second tubular member 200 and the compensation element 300. When heating the second tubular member 200, the second tubular member 200 can be heated as a whole, or only the corresponding installation position of the compensation element 300 on the second tubular member 200 can be heated.

[0046] Of course, it is understandable that the lifting device can be a lifting structure formed by two sections of pipes, or a lifting structure formed by multiple sections (three or more sections) of pipes. If the lifting device is a lifting structure formed by multiple sections of pipes, the first tubular component 100 and the second tubular component 200 in this embodiment can be any two adjacent and socketed pipes, that is, a compensation element 300 is provided between any two adjacent and socketed pipes to compensate for the gap between the two adjacent pipes.

[0047] The utility model arranges the compensating element 300 between the first tubular component 100 and the second tubular component 200 to have a structure with a fixing protrusion 320, so that during installation, the compensating element 300 can be inserted into the mounting hole 210 on the second tubular component 200 through the fixing protrusion 320 to achieve rapid positioning and installation on the second tubular component 200, thereby reducing the difficulty of assembly. At the same time, the plug-in fixing protrusion 320 and the mounting hole 210 can limit the compensating element 300 in the axial and circumferential directions. By setting the compensation element 300 as a deformable structure, during the process of installing the compensation element 300 on the second tubular component 200, the outer side surface of the second tubular component 200 will force the compensation element 300 to bend outward to maintain the pre-tightened state, and the compensation element 300 extends along the axial direction of the second tubular component 200. The outward-bent compensation element 300 is reset in the direction of the second tubular component 200 under the action of its own elastic force, so that the fixing protrusion 320 provided on the compensation element 300 presses the inner wall of the mounting hole 210, thereby keeping the compensation element 300 in a state of clamping the second tubular component 200, so as to maintain the stable installation of the compensation element 300 on the second tubular component 200, and avoid the compensation element 300 being pushed by the first tubular component 100 when the first tubular component 100 is subsequently sleeved, and axial or circumferential movement occurs on the outer surface of the second tubular component 200. The compensation element 300 compensates for the gap between the first tubular component 100 and the second tubular component 200 to prevent the two from shaking during the lifting process.Because the inner side of the compensating element 300 is provided with a hot melt protrusion 330 that abuts against the second tubular component 200, the second tubular component 200 is heated before the first tubular component 100 is sleeved. The high-temperature second tubular component 200 can melt the hot melt protrusion 330 attached to the outer surface of the second tubular component 200. At this time, the first tubular component 100 is sleeved on the outer side of the second tubular component 200, and the first tubular component 100 can be pushed toward the direction of the second tubular component 200 to push the compensating element 300. The element 300 causes the melted hot-melt protrusion 330 to be squeezed and plastically deformed toward the space around it, so that the inner side of the compensation element 300 extends along the axial direction of the outer surface of the second tubular component 200 to fit the outer surface of the second tubular component 200, thereby increasing the contact area between the second tubular component 200 and the compensation element 300, and improving the support stability between the compensation element 300 and the second tubular component 200. At the same time, by melting and squeezing the hot-melt protrusion 330, the hot-melt protrusion 330 can be reduced away from the second tubular component 200. The length between one end of the compensation element 300 and one end installed on the compensation element 300 is such that the inner wall of the first tubular component 100 abuts against the sliding surface 310 while the second tubular component 200 abuts against the hot melt protrusion 330, thereby ensuring that the compensation element 300 accurately fills the gap between the first tubular component 100 and the second tubular component 200. There is no need to prepare compensation elements 300 of different sizes according to the different gaps between the first tubular component 100 and the second tubular component 200, nor is there any need to make multiple attempts to install between the first tubular component 100 and the second tubular component 200, which greatly reduces the difficulty of assembly, improves the assembly efficiency, and reduces the production cost. Because the compensation element 300 is attached to the outer surface of the second tubular component 200 along the axial direction of the second tubular component 200, the installation position of the compensation element 300 will not be affected by the shape of the second tubular component 200, and can be matched with the outer wall of the second tubular component 200 (such as a square tube or a round tube lamp) with an arbitrary cross-section, and has a wider range of applications and high versatility.

[0048] In this embodiment, the outer side surface of the second tubular component 200 extends straight in the axial direction. When the compensation element 300 is not installed on the second tubular component 200, the compensation element 300 is bent in the axial direction to approximate a C-shaped structure. When the compensation element 300 is installed on the second tubular component 200, the second tubular component 200 forces the compensation element 300 to bend outward so that the compensation element 300 approaches to being straight in the axial direction. The compensation element 300 that is bent in the axial direction has a larger deformation amount along the radial direction of the second tubular component 200, so that when the first tubular component 100 and the second tubular component 200 are assembled, the compensation element 300 has a better effect of compensating the gap between the first tubular component 100 and the second tubular component 200.

[0049] In the present embodiment, there are two fixing protrusions 320, which are respectively a first fixing protrusion 321 and a second fixing protrusion 322. The first fixing protrusion 321 and the second fixing protrusion 322 are both arranged on the inner side of the compensation element 300. The first fixing protrusion 321 is located at the upper end of the compensation element 300, and the second fixing protrusion 322 is located at the lower end of the compensation element 300. The mounting hole 210 on the second tubular component 200 for inserting the fixing protrusion 320 also includes a first mounting hole 211 and a second mounting hole 212. The first mounting hole 211 and the second mounting hole 212 are axially spaced. The first fixing protrusion 321 is inserted into the first mounting hole 211, and the second fixing protrusion 322 is inserted into the second mounting hole 212. The compensation element 300 bent outward is reset to the direction of the second tubular component 200 under the action of its own elastic force, and is installed on the compensation element 300 at the same time. The first fixing protrusions 321 and the second fixing protrusions 322 at the lower ends will move closer to each other, so that the first fixing protrusions 321 press the inner wall of the first mounting hole 211 close to the second mounting hole 212, and the second fixing protrusions 322 press the inner wall of the second mounting hole 212 close to the first mounting hole 211, and then the first fixing protrusions 321 and the second fixing protrusions 322 jointly clamp the tube wall of the second tubular component 200 between the first mounting hole 211 and the second mounting hole 212, so as to achieve the clamping of the compensation element 300 on the second tubular component 200, and by arranging the first fixing protrusions 321 and the second fixing protrusions 322 at the upper and lower ends of the compensation element 300, the first fixing protrusions 321 and the second fixing protrusions 322 have a good clamping effect on the second tubular component 200, so as to prevent the compensation element 300 from being detached from the second tubular component 200 along the radial direction of the second tubular component 200.

[0050] Preferably, if Figure 5 As shown, the fixing protrusion 320 includes a first rib 323 and a second rib 324 that are cross-connected, and the second rib 324 extends along the axial direction of the second tubular component 200. The end of the second rib 324 is connected to the middle position of the first rib 323 and is vertically arranged with the first rib 323 to form a T-shape. The vertically cross-connected first rib 323 and the second rib 324 can increase the contact area between the compensation element 300 and the mounting hole 210 and the strength of the fixing protrusion 320 when the compensation element 300 is limited in the horizontal and vertical directions, so that the abutment between the fixing protrusion 320 and the inner wall of the mounting hole 210 is tighter and more reliable, thereby avoiding the fixing protrusion 320 from breaking.

[0051] like Figure 6As shown, the upper and lower ends of the outer side of the compensation element 300 are respectively provided with a first guiding bevel 340 and a second guiding bevel 350, the first guiding bevel 340 transitions from the upper end of the compensation element 300 to the sliding surface 310, and the second guiding bevel 350 transitions from the lower end of the compensation element 300 to the sliding surface 310, the angle between the first guiding bevel 340 and the sliding surface 310 is greater than 180 degrees, and the angle between the second guiding bevel 350 and the sliding surface 310 is greater than 180 degrees. When installing the first tubular component 100 and the second tubular component 200, the first guiding bevel 340 or the second guiding bevel 350 can guide the end of the first tubular component 100 to guide the first tubular component 100 and the second tubular component 200 to be smoothly connected, without the need to accurately align the first tubular component 100 and the second tubular component 200, thereby reducing the difficulty of assembly.

[0052] In this embodiment, if Figure 5 As shown, the hot melt protrusion 330 gradually shrinks from its root (the end connected to the compensation element 300) to the free end (the end away from the compensation element 300) so that the cross-section of the hot melt protrusion 330 is triangular or trapezoidal, that is, the amount of material used in the end where the hot melt protrusion 330 abuts against the second tubular component 200 is reduced. When the first tubular component 100 is sleeved on the outside of the second tubular component 200, the second tubular component 200 can melt and squeeze the end of the hot melt protrusion 330 faster, so that the hot melt protrusion 330 can be deformed quickly, the melting process is fast and controllable, and the hot melt protrusion 330 can better cooperate with the outer side surface of the second tubular component 200 to adapt to the outer contour of the second tubular component 200. Preferably, a plurality of hot melt protrusions 330 are dispersedly distributed on the inner side of the compensation element 300, and there is a certain gap between any two adjacent hot melt protrusions 330. When the hot melt protrusions 330 are heated and plastically deformed, the melted part will diffuse toward the peripheral side, that is, the deformed parts of the plurality of hot melt protrusions 330 will diffuse toward the gaps between each other, filling the gap between the inner side of the compensation element 300 and the outer side wall of the second tubular component 200 to increase the contact surface between the two, while preventing the deformed part of the hot melt protrusion 330 from overflowing between the compensation element 300 and the second tubular component 200, which is more beautiful. The hot melt protrusions 330 have various shapes, and can be in the shape of convex points, with multiple convex point-shaped hot melt protrusions 330 distributed in an array on the inner side of the compensation element 300; can be in the shape of ribs, with multiple rib-shaped hot melt protrusions 330 arranged in parallel; can also be in the shape of blocks, etc.

[0053] The hot melt protrusion 330 and the compensation element 300 can be integrally formed with the same material, or can be made of two materials. In order to avoid the compensation element 300 and the hot melt protrusion 330 from being hot-melt deformed together, this embodiment preferably uses two different materials to make the hot melt protrusion 330 and the compensation element 300. The melting point of the material used for the hot melt protrusion 330 is lower than the melting point of the material used for the compensation element 300 and the fixed protrusion 320, so that when the end of the hot melt protrusion 330 is heated and hot-melt deformed, the compensation element 300 and the fixed protrusion 320 with a higher melting point will not melt, thereby preventing the compensation element 300 and the fixed protrusion 320 from being deformed uncontrollably, thereby ensuring that the compensation element 300 stably compensates for the gap between the first tubular component 100 and the second tubular component 200.

[0054] like Figure 3 As shown, at least two rows of compensation elements 300 are arranged between the first tubular component 100 and the second tubular component 200, and each row is provided with a plurality of compensation elements 300. Figure 2 As shown, a plurality of compensation elements 300 are distributed at intervals along the circumferential direction on the outer side wall of the second tubular component 200, and a plurality of rows of compensation elements 300 are arranged at intervals along the axial direction of the second tubular component 200. The compensation elements 300 are supported at multiple points in the axial direction, so that the compensation elements 300 between the first tubular component 100 and the second tubular component 200 have a better supporting effect on the first tubular component 100 and the second tubular component 200, thereby preventing the first tubular component 100 and the second tubular component 200 from shaking during the lifting process.

[0055] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. The lifting device of electric lifting furniture includes: a first tubular member; as well as, A second tubular component, nested in the first tubular component and axially slidable relative to the first tubular component; as well as, A compensation element, disposed between the first tubular component and the second tubular component, for compensating for a gap therebetween; It is characterized in that the compensation element has an inner side facing the second tubular component and an outer side facing the first tubular component, the outer side of the compensation element is provided with a sliding surface contacting the inner surface of the first tubular component, the inner side of the compensation element is provided with a fixing protrusion and a hot-melt protrusion, and the second tubular component is provided with a mounting hole, the fixing protrusion is inserted into the mounting hole so that the compensation element is attached to the outer side surface of the second tubular component along the axial direction of the second tubular component, the second tubular component forces the compensation element to bend outward to maintain a pre-tightened state, thereby keeping the fixing protrusion clamping the second tubular component, and the hot-melt protrusion is plastically deformed by heat to present a shape corresponding to the outer surface of the second tubular component.

2. The lifting device for electric lifting furniture according to claim 1, characterized in that: The outer side surface of the second tubular component extends axially straight, and the compensation element is bent when not installed. The second tubular component forces the compensation element to bend outward and approach to being straight.

3. The lifting device for electric lifting furniture according to claim 2, characterized in that: A first fixing protrusion is provided at the inner upper end of the compensation element, and a second fixing protrusion is provided at the inner lower end of the compensation element. A first mounting hole and a second mounting hole are axially spaced apart on the second tubular component. The first fixing protrusion is inserted into the first mounting hole, and the second fixing protrusion is inserted into the second mounting hole. The pre-tightened state of the compensation element causes the first fixing protrusion and the second fixing protrusion to clamp the second tubular component in a direction toward each other.

4. The lifting device for electric lifting furniture according to claim 1, characterized in that: A first guiding slope and a second guiding slope are provided on the outer side of the compensation element. The first guiding slope transitions from the upper end of the compensation element to the sliding surface, and the second guiding slope transitions from the lower end of the compensation element to the sliding surface.

5. The lifting device for electric lifting furniture according to claim 1, characterized in that: The hot-melt protrusion gradually shrinks from its root toward the free end.

6. The lifting device for electric lifting furniture according to claim 1, characterized in that: The fixing protrusion includes a first convex rib and a second convex rib that are cross-connected.

7. The lifting device for electric lifting furniture according to claim 1, characterized in that: A plurality of hot-melt protrusions are dispersedly distributed on the inner side of the compensation element, and the plurality of hot-melt protrusions diffuse toward the gaps between each other when they are plastically deformed by heat.

8. The lifting device for electric lifting furniture according to claim 1, characterized in that: The hot-melt protrusion is in the shape of a convex point, a rib, or a block.

9. The lifting device for electric lifting furniture according to claim 1, characterized in that: The heat-melting protrusion has a lower melting point than the compensation element and the fixing protrusion.

10. The lifting device for electric lifting furniture according to claim 1, characterized in that: At least two rows of compensation elements are arranged between the first tubular component and the second tubular component at intervals along the axial direction.

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