Internal wiring type electric lifting stand column

Abstract

The utility model discloses an internal wiring type electric lifting stand column which comprises a telescopic sleeve and a transmission assembly arranged in the telescopic sleeve, the transmission assembly drives the telescopic sleeve to stretch out and draw back, the telescopic sleeve comprises an inner pipe, a middle pipe and an outer pipe which are sequentially connected in a sleeved mode from inside to outside, and a cable penetrates through the interior of the telescopic sleeve. The cable comprises a first guiding section guided by the first guiding piece and connected with the upper end of the electric lifting stand column, a second guiding section guided by the second guiding piece and connected with the lower end of the electric lifting stand column, and a transition section connected between the first guiding section and the second guiding section. The first guiding section is driven by the upper end of the electric lifting stand column to vertically slide relative to the second guiding section, the length of a cable is adjusted through deformation of the transition section, an insulating cabling rack connected with the middle pipe is arranged between the inner pipe and the transmission assembly, and the insulating cabling rack is provided with an isolation cavity with the upper portion and the lower portion open. When the length of the cable is in a shortened state, the first guide section, the second guide section and the transition section are all located in the isolation cavity.

Description

[Technical field]

[0001] The utility model relates to the technical field of electric lifting columns, in particular to an inner-wire type electric lifting column. [Background technology]

[0002] Electric lifting columns are very common components in the field of linear drive equipment. They are widely used in products such as electric lifting tables and electric lifting beds. Such electric lifting columns usually include a telescopic sleeve assembly, in which a transmission assembly is provided. The telescopic sleeve assembly is extended and retracted under the drive of the transmission assembly.

[0003] An existing internal wiring type electric lifting column includes a telescopic sleeve assembly, which includes an inner tube, a middle tube and an outer tube which are sequentially sleeved from the inside to the outside. The transmission assembly drives the inner tube, the middle tube and the outer tube to retract relative to each other. A cable fixer is provided in the telescopic sleeve, and the cable fixer includes a first cable fixer and a second cable fixer. The first cable fixer is located at the upper end of the telescopic sleeve assembly, and the second cable fixer is located at the lower end of the telescopic sleeve assembly. The cable passes through the interior of the telescopic sleeve assembly and is fixed by the first cable fixer and the second cable fixer, and the portion of the cable located between the first cable fixer and the second cable fixer can be bent and deformed freely, so that the cable can be retracted and extended following the lifting and lowering movement of the electric lifting column. When the cable is partially damaged due to long-term use, since the inner tube, middle tube, outer tube and transmission assembly are all metal parts, and when the cable is in a shortened state, the accumulation of cables will increase the probability of contact between the cable and the telescopic sleeve and the transmission assembly. Therefore, when the damaged part of the cable comes into contact with the telescopic sleeve or the transmission assembly, there will be a risk of short circuit and leakage, thereby reducing the safety of product use; in addition, during the lifting and lowering movement of the electric lifting column, since the part of the cable between the first wire holder and the second wire holder is not restrained, this part will shake and hit the telescopic sleeve or the transmission assembly, thereby generating collision noise, reducing the user experience. [Contents of the utility model]

[0004] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide an internal wiring type electric lifting column. When the length of the cable is in a shortened state, the cable is insulated and isolated by an isolation cavity, which can reduce the risk of short circuit and leakage. In addition, the isolation cavity can also constrain the cable to a certain stroke when it is retracted and released, so as to reduce the collision noise caused by the shaking of the cable.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] An inner-wire electric lifting column, comprising a telescopic sleeve and a transmission assembly arranged in the telescopic sleeve, the transmission assembly drives the telescopic sleeve to extend and retract, the telescopic sleeve comprises an inner tube, a middle tube and an outer tube which are sequentially sleeved from the inside to the outside, and the cable runs through the interior of the telescopic sleeve, the cable comprises a first guide section which is guided by a first guide member and connected to the upper end of the electric lifting column, a second guide section which is guided by a second guide member and connected to the lower end of the electric lifting column, and a transition section connected between the first guide section and the second guide section, the first guide section slides vertically relative to the second guide section under the drive of the upper end of the electric lifting column and realizes the retraction and extension of the cable length through the deformation of the transition section, an insulating wiring rack connected to the middle tube is arranged between the inner tube and the transmission assembly, the insulating wiring rack has an isolation cavity which is open at the top and the bottom, and when the length of the cable is in a shortened state, the first guide section, the second guide section and the transition section are all located in the isolation cavity.

[0007] When the electric lifting column in the utility model is retracted to the minimum stroke, the cables will be concentrated and accumulated between the inner tube and the transmission assembly in a non-spiral winding manner. For this purpose, an insulating wiring rack is provided between the inner tube and the transmission assembly, and the insulating wiring rack has an isolation cavity open at the top and bottom. Therefore, when the length of the cable is in a shortened state, the first guide section, the second guide section and the transition section are all located in the isolation cavity, thereby isolating the cable from the telescopic sleeve, and isolating the cable from the transmission assembly, avoiding the contact between the damaged part of the cable and the telescopic sleeve and / or the transmission assembly, thereby reducing the risk of short circuit and leakage; in addition, the insulating wiring rack is connected to the middle tube, and the insulating wiring rack and the middle tube can be raised and lowered synchronously. In this way, when the electric lifting column is raised and lowered, at least the middle part of the transition section is limited in the isolation cavity to enhance the restraining effect on both ends of the transition section, and it is ensured that at least part of the stroke of the first guide and the second guide is in the purpose of being restrained by the isolation cavity, thereby enhancing the restraining effect on the entire cable when the cable is retracted and released, and reducing the cable shaking and collision noise.

[0008] A separation rib is provided in the isolation cavity, and the separation rib separates the interior of the isolation cavity into a first guide cavity and a second guide cavity extending vertically. The first guide member is arranged through the first guide cavity, and the second guide member is arranged through the second guide cavity. With such a design, the vertical guiding effect of the first guide member can be further improved through the first guide cavity, and the vertical guiding effect of the second guide member can be further improved through the second guide cavity, so as to avoid violent shaking of the free ends of the first guide member and the second guide member, thereby preventing the pulling transition section from shaking, thereby reducing collision noise.

[0009] The cavity wall of the isolation cavity includes a first side wall and a second side wall that are arranged opposite to each other and extend vertically, the partition rib includes a first partition rib parallel to the first side wall and a second partition rib parallel to the second side wall, the first partition rib and the first side wall form a part of the cavity wall of the first guide cavity, and the second partition rib and the second side wall form a part of the cavity wall of the second guide cavity. Such a design not only makes the cavity volume between the first partition rib and the second partition rib in the isolation cavity larger, so as to accommodate the transition section that is piled up when the cables are shortened, thereby avoiding the transition section from being piled up, squeezed and damaged due to too small a space; in addition, the structure of the partition rib can be made simpler, so as to reduce the processing difficulty of the insulating wiring rack.

[0010] When the length of the cable is in the extended state, the lower end of the first guide member is located in the first guide cavity, and the upper end of the second guide member is located in the second guide cavity. With such a design, during the entire extension process of the cable, the first guide cavity can maintain the guide limit position of the first guide member, and the second guide cavity can maintain the guide limit position of the second guide member, thereby improving the restraint effect on the cable and preventing the cable from shaking.

[0011] The insulating wiring rack includes a wiring frame and a wiring frame cover arranged vertically, and the wiring frame cover cooperates with the wiring frame to form an isolation cavity. Such a design is convenient for processing and forming the insulating wiring rack, and also convenient for subsequent separate replacement of the wiring frame and the wiring frame cover.

[0012] The wiring frame includes a bottom plate and side plates formed by bending the bottom plate in the same direction on opposite sides. The inner side of the side plate is provided with a vertically extending slot, and the edge of the wiring frame cover is inserted into the slot. With this design, the two vertical edges of the wiring frame cover are inserted into the slot to achieve the matching of the wiring frame and the wiring frame cover, without the need for other tools, thereby facilitating the disassembly and assembly of the insulating wiring frame.

[0013] The electric lifting column also includes a middle tube fixing seat located below the inner tube, and the transmission assembly also includes a second sleeve connected to the middle tube fixing seat. The second sleeve drives the middle tube to rise and fall synchronously through the middle tube fixing seat, and the insulating wiring rack is connected to the middle tube fixing seat through a clamping column. With such a design, the insulating wiring rack and the middle tube can be indirectly connected by connecting the existing middle tube fixing seat with the insulating wiring rack, without adding other parts, and the existing electric lifting column is slightly modified; in addition, the insulating wiring rack is connected to the middle tube fixing seat through the clamping column, which can reduce the difficulty of assembling the insulating wiring rack and the middle tube fixing seat.

[0014] The clamping column includes a body and an elastic buckle arranged at one end of the body and arranged at intervals in the circumferential direction. The body passes through the wiring frame cover, and the elastic buckle is clamped with the wiring frame and the middle tube fixing seat. With such a design, during assembly, the body passes through the wiring frame cover, and the elastic buckle is deformed to be clamped with the wiring frame and the middle tube fixing seat, thereby realizing that the clamping column connects the insulating wiring frame with the middle tube fixing seat, and the wiring frame cover and the wiring frame can also be kept relatively fixed through the clamping column. The entire assembly process does not require the use of tools, and the assembly is relatively convenient.

[0015] The transition section includes a positioning section that is positioned on the insulating wiring rack by a positioning member and a free section connected to both ends of the positioning section. When the length of the cable is in a shortened state, the first guide section and the second guide section are located on both sides of the positioning section in the horizontal direction, and the two free sections are reversely bent at both ends of the positioning section so that the cable is placed in a Z-shaped or S-shaped manner in the isolation cavity. With such a design, this wiring method can not only reserve sufficient stretching margin, but also minimize the degree of bending deformation of the free section to avoid excessive bending and rupture of the free section; in addition, when the electric lifting column rises, even if the stretching causes the cable to deform, the trajectory of each section of the cable can still basically move along this S or Z-shaped route.

[0016] The electric lifting column also includes a driving device, the upper end of the electric lifting column includes a housing that accommodates the driving device and is connected to the inner tube, and the lower end of the electric lifting column includes a bottom plate that is connected to the bottom end of the outer tube.

[0017] The first guide member is connected to the housing through a second fastener, and the first guide member and the first guide section are kept relatively fixed; or the first guide member is sleeved on the outside of the first guide section, a first through hole is provided on the side wall of the first guide member, and the first guide section passes through the first through hole so that the first guide member and the first guide section are kept relatively fixed;

[0018] The second guide is connected to the bottom plate through a third fastener, and the second guide is relatively fixed to the second guide section; or the second guide is sleeved on the outside of the second guide section, and the side wall of the second guide is provided with a second through-hole, and the second guide section penetrates the second through-hole so that the second guide is relatively fixed to the second guide. With this design, the two guide sections can be lifted and lowered by lifting the electric lifting column to realize the retraction and release of the cables, and the two guide sections can be kept lifted and lowered synchronously with the corresponding guide, so that the guide guides the movement trajectory of the corresponding guide section to avoid the problem of cable accumulation and reduce the probability of cable accumulation.

[0019] These features and advantages of the present invention will be disclosed in detail in the following specific implementation manners and drawings.

Brief Description of the Drawings

[0020] The utility model is further described below in conjunction with the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the structure of the electric lifting column in the first embodiment of the utility model when it is in a retracted state;

[0022] Figure 2 This is a schematic diagram of the explosion structure when the electric lifting column in the first embodiment of the utility model is in a retracted state;

[0023] Figure 3 This is a schematic diagram of assembling the cable shortening and the insulating wiring rack in the first embodiment of the utility model;

[0024] Figure 4 This is a cross-sectional view of the cable after being shortened and assembled with the insulating wiring rack in the first embodiment of the utility model;

[0025] Figure 5 It is a structural schematic diagram of the positioning section positioned on the wiring frame in the first embodiment of the utility model;

[0026] Figure 6 for Figure 3 Schematic diagram of the explosion structure;

[0027] Figure 7 for Figure 1 Sectional view of AA in the middle;

[0028] Figure 8 This is a schematic diagram of the structure of the clamping column in the first embodiment of the present utility model;

[0029] Fig. 9 It is a top view of the electric lifting column in the first embodiment of the utility model when it is in a retracted state;

[0030] Fig.10 for Fig. 9 Cross-sectional view of the middle BB;

[0031] Fig.11 for Fig. 9 Cross-sectional view of CC;

[0032] Fig.12 It is a cross-sectional view of the electric lifting column in the first embodiment of the utility model when it is in an extended state;

[0033] Fig.13 This is a schematic diagram of the structure of the cable in the first embodiment of the utility model when it is in a lengthened state;

[0034] Fig.14 This is a schematic diagram of the structure in which the positioning member in the second embodiment of the utility model is installed on the wiring frame;

[0035] Reference numerals:

[0036] 100, telescopic sleeve; 110, inner tube; 120, middle tube; 130, outer tube; 200, transmission assembly; 210, transmission screw; 220, hollow spindle; 230, first sleeve; 231, first transmission nut; 240, second sleeve; 241, second transmission nut; 242, through hole; 250, middle tube fixing seat; 251, first half fixed block; 2511, boss; 252, second half fixed block; 253, mounting hole; 2531, first connecting plate; 2532, second connecting plate; 300, cable; 310a, first guide section; 310b, second guide section; 320, positioning section; 330, free section; 340, transition section; 400a, first guide member; 400b, second guide member ;410, opening;411, second through hole;420, second fastener;430, third fastener;500, positioning member;501, first end;502, second end;510, limiting groove;520, first fastener;600, insulating wiring rack;601, isolation cavity;602, first guide cavity;603, second guide cavity;610, wiring frame cover;620, wiring frame;621, bottom wall;6210, partition rib;6211, first partition rib;6212, second partition rib;622, first side wall;6221, slot;623, second side wall;700, card column;710, body;720, elastic buckle;721, card slot;800, casing;810, connecting piece;900, bottom plate. [Specific implementation method]

[0037] The utility model provides an inner-wire electric lifting column, comprising a telescopic sleeve and a transmission assembly arranged in the telescopic sleeve, the transmission assembly drives the telescopic sleeve to extend and retract, the telescopic sleeve comprises an inner tube, a middle tube and an outer tube which are sequentially sleeved from the inside to the outside, and a cable runs through the interior of the telescopic sleeve, the cable comprises a first guide section which is guided by a first guide member and connected to the upper end of the electric lifting column, a second guide section which is guided by a second guide member and connected to the lower end of the electric lifting column, and a transition section connected between the first guide section and the second guide section, the first guide section slides vertically relative to the second guide section under the drive of the upper end of the electric lifting column and realizes the retraction and extension of the cable length through the deformation of the transition section, an insulating wiring rack connected to the middle tube is arranged between the inner tube and the transmission assembly, the insulating wiring rack has an isolation cavity which is open at the top and the bottom, and when the length of the cable is in a shortened state, the first guide section, the second guide section and the transition section are all located in the isolation cavity.

[0038] When the electric lifting column in the utility model is retracted to the minimum stroke, the cables will be concentrated and accumulated between the inner tube and the transmission assembly in a non-spiral winding manner. For this purpose, an insulating wiring rack is provided between the inner tube and the transmission assembly, and the insulating wiring rack has an isolation cavity open at the top and bottom. Therefore, when the length of the cable is in a shortened state, the first guide section, the second guide section and the transition section are all located in the isolation cavity, thereby isolating the cable from the telescopic sleeve, and isolating the cable from the transmission assembly, avoiding the contact between the damaged part of the cable and the telescopic sleeve and / or the transmission assembly, thereby reducing the risk of short circuit and leakage; in addition, the insulating wiring rack is connected to the middle tube, and the insulating wiring rack and the middle tube can be raised and lowered synchronously. In this way, when the electric lifting column is raised and lowered, at least the middle part of the transition section is limited in the isolation cavity to enhance the restraining effect on the two ends of the transition section, and it is ensured that at least part of the stroke of the first guide and the second guide is in the purpose of being restrained by the isolation cavity, thereby enhancing the restraining effect on the entire cable when the cable is retracted and released, so as to reduce the cable shaking and collision noise.

[0039] The technical scheme of the embodiment of the utility model is explained and illustrated below in conjunction with the drawings of the embodiment of the utility model, but the following embodiments are only preferred embodiments of the utility model, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without making creative work all belong to the protection scope of the utility model. In addition, it should be understood that the following words indicating orientation or position relationship such as "up", "down", "left", "right", "longitudinal", "lateral", "inside", "outside", "vertical", "horizontal", "top", "bottom", etc. are only based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0040] Reference Figures 1 to 13As shown, the inner-wire type electric lifting column in this embodiment includes a telescopic sleeve 100 and a transmission assembly 200 arranged in the telescopic sleeve 100, the transmission assembly 200 drives the telescopic sleeve 100 to extend and retract, the telescopic sleeve 100 includes an inner tube 110, a middle tube 120 and an outer tube 130 which are sequentially sleeved from the inside to the outside, the cable 300 is arranged to pass through the inside of the telescopic sleeve 100, and the cable 300 includes a first guide section 310a guided by a first guide member 400a, a second guide section 310b guided by a second guide member 400b, and a first guide section 310a connected to the first guide section 310b. a and 310b, wherein the upper end of the first guide section 310a is connected to the upper end of the electric lifting column, and the lower end of the first guide section 310a extends vertically downward under the guidance of the first guide member 400a, while the lower end of the second guide section 310b is connected to the lower end of the electric lifting column, and the upper end of the second guide section 310b extends vertically upward under the guidance of the second guide member 400b. Driven by the upper end of the electric lifting column, the first guide section 310a slides vertically relative to the second guide section 310b and realizes the retraction and extension of the cable length through the deformation of the transition section 340.

[0041] When the electric lifting column is retracted to the minimum stroke, the cable 300 will be concentrated and accumulated between the inner tube 110 and the transmission assembly 200 in a non-helical winding manner. In order to prevent the cable 300 from contacting the inner tube 110 and the transmission assembly 200, an insulating wiring rack 600 connected to the middle tube 120 is provided between the inner tube 110 and the transmission assembly 200 in this embodiment. The insulating wiring rack 600 has an isolation cavity 601 opened at the top and bottom. The upper end of the first guide section 310a passes through the upper end of the isolation cavity 601 upwardly and is connected to the upper end of the electric lifting column, and the lower end of the second guide section 310b passes through the lower end of the isolation cavity 601 downwardly and is connected to the lower end of the electric lifting column. When the length of the cable 300 is in a shortened state, the first guide section 310a, the second guide section 310b and the transition section 340 are all located in the isolation cavity 601, so as to The wire rack 600 isolates the cable 300 from the telescopic sleeve 100, and isolates the cable 300 from the transmission assembly 200, thereby preventing the damaged part of the cable 300 from contacting the telescopic sleeve 100 and / or the transmission assembly 200, thereby reducing the risk of short circuit and leakage; in addition, the insulating wiring rack 600 is connected to the middle tube 120, so that the insulating wiring rack 600 and the middle tube 120 can be raised and lowered synchronously, so that when the electric lifting column is raised and lowered, at least the middle part of the transition section 340 is limited in the isolation cavity 601, so as to enhance the restraining effect on both ends of the transition section, and to ensure that the first guide 400a and the second guide 400b are restrained by the isolation cavity 601 during at least part of the stroke, thereby enhancing the restraining effect on the entire cable when the cable 300 is retracted and released, so as to reduce the shaking of the cable 300 and the collision noise.

[0042] like Figures 2 to 6 , Fig.10 , Fig.11 and Fig.13 As shown, the first guide member 400a and the second guide member 400b in this embodiment are preferably vertically extending wire clamps, the wire clamps are plastic parts, and the side walls of the wire clamps are provided with an opening 410 (such as Figure 3 As shown in the figure, the first guide section 310a is inserted into the first guide member 400a through the opening 410, and the two basically do not move relative to each other. The second guide section 310b is inserted into the second guide member 400b through the opening 410, and the two basically do not move relative to each other. In this way, the first guide member 400a guides the first guide section 310a to extend vertically, and the second guide member 400b guides the second guide section 310b to extend vertically, and the assembly of the guide members and the guide sections is also facilitated. Therefore, when the cable 300 is pulled by the electric lifting column, the wire clamp moves synchronously with the cable 300.

[0043] In order to form the above-mentioned isolation cavity 601, the insulating wiring rack 600 in this embodiment includes a wiring frame cover 610 and a wiring frame 620 arranged vertically, and the wiring frame cover 610 and the wiring frame 620 are both plastic plates, wherein the wiring frame cover 610 is arranged close to the transmission assembly 200, and the wiring frame 620 is arranged close to the inner tube 110, and the wiring frame cover 610 and the wiring frame 620 cooperate to form an isolation cavity 601 with open ends at the upper and lower ends. Such a design is convenient for the processing and forming of the insulating wiring rack 600, and can also facilitate the subsequent separate replacement of the wiring frame 620 and the wiring frame cover 610.

[0044] In the present embodiment, a separation rib 6210 is provided inside the isolation cavity 601, and the separation rib 6210 separates the interior of the isolation cavity 601 into a first guide cavity 602 and a second guide cavity 603 extending vertically, and the first guide member 400a is arranged through the first guide cavity 602 and is slidably matched with the first guide cavity 602, and the second guide member 400b is arranged through the second guide cavity 603 and is slidably matched with the second guide cavity 603. With such a design, the vertical guiding effect of the first guide member 400a can be further improved through the first guide cavity 602, and the vertical guiding effect of the second guide member 400b can be further improved through the second guide cavity 603, so as to avoid the free end of the first guide member 400a (i.e., the lower end of the first guide member 400a) and the free end of the second guide member 400b (i.e., the upper end of the second guide member 400b) from shaking violently and pulling the transition section to shake, thereby reducing the collision noise.

[0045] In addition, in this embodiment, the cavity wall of the isolation cavity 601 includes a first side wall 622 and a second side wall 623 that are arranged opposite to each other and extend vertically, and the partition rib 6210 includes a first partition rib 6211 parallel to the first side wall 622 and a second partition rib 6212 parallel to the second side wall 623. The first partition rib 6211 and the first side wall 622 form a part of the cavity wall of the first guide cavity 602, and the second partition rib 6212 and the second side wall 623 form a part of the cavity wall of the second guide cavity 603. Such a design not only makes the cavity volume between the first partition rib 6211 and the second partition rib 6212 in the isolation cavity 601 larger, so as to accommodate the transition section 340 that is piled up when the cable 300 is shortened, thereby avoiding the transition section 340 from being piled up, squeezed and damaged due to too small a space; in addition, the structure of the partition rib 6210 can be made simpler, so as to reduce the difficulty of processing the insulating wiring rack 600.

[0046] The wiring frame 620 in this embodiment includes a bottom wall 621 extending vertically, and two side walls formed by bending in the same direction on opposite sides of the bottom wall 621, the two side walls extend vertically, one of the two side walls forms the above-mentioned first side wall 622, and the other forms the above-mentioned second side wall 623, the inner sides of the two side walls are provided with vertically extending slots 6221, the wiring frame cover 610 is a flat plate, and the two vertical edges of the wiring frame cover 610 are inserted into the slots 6221, so that the wiring frame cover 610 and the wiring frame 620 cooperate to form the above-mentioned isolation cavity 601, and the bottom wall 621 and the first partition rib 6211 and the second partition rib 6212 are integrally injection molded.

[0047] It can be understood that in other embodiments of the present invention, the first partition rib and the second partition rib can also be integrally formed with the wiring frame cover; and / or the first side wall and the second side wall can be integrally formed with the wiring frame cover.

[0048] like Fig.13As shown, in order to further enhance the restraining effect on the cable 300, in this embodiment, when the length of the cable 300 is in a lengthened state, that is, when the electric lifting column is extended to the maximum stroke, the lower end of the first guide member 400a is located in the first guide cavity 602, and the upper end of the second guide member 400b is located in the second guide cavity 603. With such a design, during the entire process of lengthening the cable 300, the first guide cavity 602 can maintain the guide limit for the first guide member 400a, and the second guide cavity 603 can maintain the guide limit for the second guide member 400b, so as to improve the restraint effect on the cable 300 and prevent the cable 300 from shaking; in addition, when the cable 300 is in the lengthening state, the first guide cavity 602 can be used to isolate the lower end of the first guide segment 310a, and the second guide cavity 603 can be used to isolate the upper end of the second guide segment 310b, thereby preventing the lower end of the first guide segment 310a and the upper end of the second guide segment 310b from contacting the inner tube 110 and the transmission assembly 200, thereby preventing the risk of short circuit and leakage.

[0049] In addition, in order to further prevent the transition section 340 from shaking greatly, the transition section 340 in this embodiment includes a positioning section 320 and a free section 330 connected to both ends of the positioning section 320, that is, one free section 330 connects one end of the positioning section 320 with the first guide section 310a, and the other free section 330 connects the other end of the positioning section 320 with the second guide section 310b. The positioning section 320 is positioned on the insulating wiring rack 600 by the positioning member 500. During the process of retracting and releasing the cable 300, the positioning section 320 is positioned by the positioning member 500 to limit its movement toward the end of the middle tube 120. When the length of the cable 300 is in a shortened state, the first guide section 310a and the second guide section 310b are located on both sides of the positioning section 320 in the horizontal direction, and the two free sections 330 are reversely bent and arranged at both ends of the positioning section 320, so that the cable 300 is placed in the isolation cavity 601 in a Z-shape or S-shape. With such a design, this wiring method can not only reserve sufficient stretch margin, but also minimize the bending deformation of the free section 330 to avoid excessive bending and rupture of the free section 330.

[0050] In addition, in this embodiment, the positioning member 500 is used to form a positioning section 320 on the cable 300. Different from the two guide sections on the cable 300, the positioning section 320 and the middle tube 120 are relatively fixed in position during the lifting process of the electric lifting column, that is, the positioning section 320 and the middle tube 120 are lifted and lowered synchronously, and the transition section 340 forms two free sections 330. The positioning section 320 is spaced between the two free sections 330. This means that during the lifting process of the electric lifting column, the cables between the two guide sections will not be pushed to the end of the lifting column by the pulling force formed by the lifting movement to cause the cable accumulation problem. The electric lifting column can operate in a safer working condition, and its service life is also extended.

[0051] Moreover, for the internal wiring electric lifting column involved in this embodiment, the cable inside is different from the stretching of the spiral cable. The cable 300 needs to be bent and folded to a certain extent to reserve a stretching margin. This can be understood: when the electric lifting column is manufactured, the cable needs to be arranged according to the design requirements. It is not bent and folded at will. In the operation process, it is also expected that the cable is basically retracted and released according to the predetermined ideal trajectory. This can avoid the cable touching other parts to cause noise, motion interference and many other problems. However, when the problems of the prior art occur, the motion trajectory of the free part of the cable is chaotic, which is very unfavorable for the operation of the lifting column. In this embodiment, because of the design of the positioning section 320, the wiring trajectory of the cable 300 can be stabilized. As mentioned above, the cable between the two guide sections will not be pushed to the end of the electric lifting column by the pulling force formed by the lifting movement. Regardless of whether the lengths of the two free sections 330 are consistent, the cable itself can be retracted and released in an ideal trajectory or close to an ideal trajectory. This can greatly reduce the failure rate for the internal wiring electric lifting column.

[0052] In order to ensure that the positioning section 320 cannot move toward the end of the middle tube 120 after being positioned by the positioning piece 500, the positioning piece 500 in this embodiment positions the positioning section 320 on the side of the bottom wall 621 facing the wiring frame cover 610. The positioning piece 500 is an insulating pressure plate, such as a plastic pressure plate or a wooden board, preferably a plastic pressure plate. The two ends of the insulating pressure plate are respectively fixed to the bottom wall 621 by first fasteners 520. The positioning section 320 extends roughly vertically and is located between the insulating pressure plate and the bottom wall 621. The two first fasteners 520 are located on both sides of the positioning section 320, so as to achieve the positioning of the positioning section 320 by the positioning piece 500, thereby achieving the effect of limiting the movement of the positioning section 320 toward the end of the middle tube 120, and at the same time, it can also limit the movement of the positioning section 320 in the length direction of the insulating pressure plate. In the present embodiment, the first fastener 520 is preferably a screw, and the bottom wall 621 is provided with a threaded hole. The screw passes through the insulating pressure plate and is locked with the threaded hole to fix the insulating pressure plate on the bottom wall 621. The insulating pressure plate and the bottom wall 621 are connected by the first fastener 520, which can improve the fixing effect of the positioning member 500 and prevent the positioning member 500 from falling off, thereby improving the positioning effect of the positioning section 320.

[0053] It can be understood that in other embodiments of the present invention, the first fastener can also be a buckle or a bolt and nut. When the first fastener is a buckle, a snap-on hole is provided on the bottom wall, and the insulating pressure plate is fixed to the bottom wall by snapping together the buckle and the snap-on hole; when the first fastener is a bolt and nut, a through hole is provided on the bottom wall, and the screw rod of the bolt passes through the insulating pressure plate and the through hole and is connected to the nut, thereby fixing the insulating pressure plate to the bottom wall.

[0054] Better, such as Fig.10 As shown, in this embodiment, a vertically penetrating limiting groove 510 is provided on the side of the insulating pressure plate facing the bottom wall 621, and the limiting groove 510 is an arc-shaped groove. At least part of the positioning section 320 is located in the limiting groove 510. Such a design can not only limit the positioning section 320 in the length direction of the insulating pressure plate through the limiting groove 510 to improve the positioning effect of the positioning section 320 and avoid it from shifting to the left or right, but also increase the contact area between the insulating pressure plate and the positioning section 320 to reduce the force per unit area of ​​the positioning section 320, thereby avoiding the insulating pressure plate from crushing the positioning section 320.

[0055] The insulating pressure plate in this embodiment is tilted relative to the positioning section 320 , which can increase the vertical length of the limiting groove 510 , thereby increasing the vertical contact area between the limiting groove 510 and the positioning section 320 , thereby improving the positioning effect of the positioning section 320 .

[0056] When the length of the transition section 340 is constant, the longer the length of the positioning section 320 positioned by the positioning member 500 is, the shorter the length of the two free sections 330 is, and the smaller the margin available for stretching of the two free sections 330 is, resulting in the limitation of the maximum extension stroke of the electric lifting column. In order to maximize the maximum extension stroke of the electric lifting column when the length of the transition section 340 is constant, the length of the positioning section 320 in this embodiment is minimized, for example, the length of the positioning section 320 can be less than 2 cm. In order to make the stretching margin of the two free sections 330 the same when the cable is stretched, the length of the two free sections 330 in this embodiment is the same, so that the positioning section 320 can be fixed in the middle of the cable between the two guide sections.

[0057] It is understandable that in other embodiments of the present invention, the lengths of the two free sections may also be different, which can be achieved by adjusting the distance between the positioning section and the two guide sections, which will not be described in detail here.

[0058] It can be understood that in other embodiments of the present invention, the first guide member and the second guide member may also be vertically extending plastic tubes, which are sleeved on the outside of the corresponding guide sections and have an interference fit with the corresponding guide sections.

[0059] It can be understood that in other embodiments of the present invention, the wiring frame cover and the wiring frame can also be connected by screws or clamped to form an isolation cavity.

[0060] like Figure 11 to Figure 12As shown, in order to realize the transmission assembly 200 driving the telescopic sleeve 100 to extend and retract, the transmission assembly 200 in this embodiment includes a transmission screw 210, a hollow shaft 220 with an external thread, a first sleeve 230 and a second sleeve 240. The hollow shaft 220 is sleeved on the outside of the transmission screw 210. The hollow shaft 220 rotates synchronously with the transmission screw 210 and can slide axially relative to the transmission screw 210. The first sleeve 230 is connected to a first transmission nut 231 that is threadably matched with the external thread of the hollow shaft 220. The second sleeve 240 is sleeved on the outside of the first sleeve 230 and is connected to the second transmission nut 241. The transmission nut 241 is threadedly matched with the transmission screw 210, and the hollow shaft 220 is axially positioned with the second transmission nut 241 in a rotatable manner. The bottom end of the second sleeve 240 is connected to a plastic middle tube fixing seat 250, and the middle tube fixing seat 250 is located below the inner tube 110. The outer peripheral side of the middle tube fixing seat 250 is provided with a convex edge supporting the bottom of the middle tube 120, so that the second sleeve 240 drives the middle tube 120 to rise and fall synchronously through the connection of the middle tube fixing seat 250. The specific structure of the transmission assembly 200 can refer to the prior art CN207016433U design, and the middle tube fixing seat 250 is equivalent to the fixing block in CN 207016433U, which will not be described in detail here.

[0061] In this embodiment, the insulating wiring rack 600 is connected to the middle pipe fixing seat 250 through the clamping column 700, so that the bottom of the insulating wiring rack 600 is connected to the middle pipe 120 through the middle pipe fixing seat 250. With such a design, the insulating wiring rack 600 can be indirectly connected to the middle pipe 120 by using the existing middle pipe fixing seat 250, without adding other parts, and the existing electric lifting column is slightly modified; in addition, the insulating wiring rack 600 is connected to the middle pipe fixing seat 250 through the clamping column 700, which can reduce the difficulty of assembling the insulating wiring rack 600 and the middle pipe fixing seat 250.

[0062] like Figure 7 , Figure 8 and Fig.13 As shown, in order to facilitate the connection between the middle tube fixing seat 250 and the second sleeve 240, the middle tube fixing seat 250 in this embodiment includes a first half fixing block 251 and a second half fixing block 252 that are connected to each other. Two through holes 242 are respectively provided on the opposite side walls of the second sleeve 240. The inner surface of the first half fixing block 251 that contacts the second sleeve 240 is provided with a boss 2511, and the boss 2511 is inserted into one of the through holes 242, so that the first half fixing block 251 is fixedly installed on the second sleeve 240, and the second half fixing block 252 is connected to the insulating wiring rack 600 through a clamping column 700, and one end of the clamping column 700 is inserted into another through hole 242, so that the second half fixing block 252 is fixedly installed on the second sleeve 240.

[0063] like Figure 7 and Figure 8 As shown, in order to realize the connection of the insulating wiring rack 600 to the second semi-fixed block 252 through the clamping column 700, the second semi-fixed block 252 in this embodiment is provided with a mounting hole 253 for the insulating wiring rack 600 to pass through, and the portion of the second semi-fixed block 252 surrounding the mounting hole 253 includes a first connecting plate 2531 corresponding to the wiring frame cover 610 and a second connecting plate 2532 corresponding to the wiring frame 620, wherein the first connecting plate 2531 is provided with an avoidance hole on which the second sleeve 240 is sleeved, and the wiring frame 620 and the second connecting plate 2532 are both provided with limiting holes, and the clamping column 700 made of plastic material includes a body 710 and an elastic buckle 720 provided at one end of the body 710 and circumferentially spaced. The outer diameter of the main body 710 is smaller than the aperture of the limiting hole and extends into the avoidance hole after passing through the wiring frame cover 610 to be inserted into the through hole 242. One end of the elastic clip 720 is connected to the end face of the main body 710, and the other end extends axially toward the side away from the main body 710. A slot 721 is provided on the outer peripheral side of the elastic clip 720. The portion of the wiring frame 620 located around the limiting hole and the portion of the second connecting plate 2532 located around the limiting hole are both clamped in the slot 721. The portions of the elastic clip 720 located on both sides of the slot 721 are limited between the inner side of the wiring frame 620 and the outer side of the second half fixed block 252, thereby realizing the clamping connection between the elastic clip 720 and the wiring frame 620 and the second half fixed block 252. During assembly, after the insulating wiring rack 600 passes through the installation hole 253, the main body 710 passes through the two limiting holes and then extends into the avoidance hole and is inserted into the through hole 242. The elastic clip 720 is squeezed by the limiting hole and deforms inward so that the part of the elastic clip 720 located on the axial inner side of the slot 721 passes through the limiting hole. When the slot 721 is engaged with the wiring frame 620 and the second connecting plate 2532, the part of the elastic clip 720 located on the axial outer side of the slot 721 is limited on the outer side of the second connecting plate 2532, thereby realizing that the insulating wiring rack 600 is connected to the second half fixed block 252 by the clamping column 700, and the wiring frame cover 610 and the wiring frame 620 can also be kept relatively fixed in the vertical direction through the clamping column 700. The entire assembly process does not require the aid of tools, and the assembly is relatively convenient.

[0064] It can be understood that in other embodiments of the present invention, a threaded hole is provided on the second sleeve, and the second connecting plate, the wiring frame, and the wiring frame cover are screwed and locked with the threaded hole. Such a design can also realize the connection between the bottom of the insulating wiring frame and the middle tube fixing seat, as well as the connection between the second half fixed block and the second sleeve.

[0065] Finally, if Figure 5 and Fig.10As shown, in order to realize the connection between the first guide section 310a and the upper end of the electric lifting column, the upper end of the electric lifting column in this embodiment includes a casing 800, and the electric lifting column also includes a driving device, which is installed in the casing 800. The driving device drives the transmission screw 210 to rotate, the casing 800 is welded to the upper end of the inner tube 110, and a connecting piece 810 is fixed in the casing 800. The upper end of the first guide member 400a is fixedly connected to the connecting piece 810 through a second fastener 420. The second fastener 420 is preferably a screw, so as to realize the connection between the first guide member 400a and the upper end of the electric lifting column. The first guide member 400a and the first guide section 310a are interference fit, so that the first guide member 400a and the first guide section 310a basically do not move relative to each other, so the first guide member 400a can be driven to rise and fall by the casing 800 to realize the synchronous rise and fall of the first guide section 310a.

[0066] In order to realize the connection between the second guide section 310b and the lower end of the electric lifting column, the lower end of the electric lifting column in this embodiment includes a bottom plate 900 welded to the bottom end of the outer tube 130, and the lower end of the second guide member 400b is fixedly connected to the bottom plate 900 through a third fastener 430. The third fastener 430 is preferably a screw, so as to realize the connection between the second guide member 400b and the lower end of the electric lifting column, wherein the side wall of the second guide member 400b is provided with a second through hole 411 penetrating in the horizontal direction, and the second guide section 310b is bent and penetrates the second through hole 411. With such a design, the second guide member 400b and the second guide section 310b can be kept relatively fixed, that is, the two basically do not move relative to each other, so the second guide member 400b can be driven to rise and fall through the bottom plate 900 to realize the synchronous lifting and falling of the second guide section 310b.

[0067] It can be understood that in other embodiments of the present invention, the side wall of the first guide member is provided with a first through hole penetrating in the horizontal direction, and the first guide section is bent and penetrates the first through hole, so that the first guide member and the first guide section remain relatively fixed, that is, the two basically do not move relative to each other. With such a design, the first guide member can be driven to rise and fall synchronously by pulling the first guide section, and the first guide member does not need to be connected to the casing by fasteners, thereby reducing the number of parts and assembly steps.

[0068] It can be understood that in other embodiments of the present invention, the side wall of the second guide member is provided with a second through hole running through it in the horizontal direction, and the second guide section is bent and passes through the second through hole, so that the second guide member and the second guide section remain relatively fixed, that is, the two basically do not move relative to each other. With such a design, the second guide member can be driven to rise and fall synchronously by pulling the second guide section, and there is no need for the second guide member to be connected to the base plate by fasteners, thereby reducing the number of parts and assembly steps.

[0069] It can be understood that in other embodiments of the present invention, the first guide member and the first guide section are interference fit, so that the first guide member and the first guide section basically do not move relative to each other, and the first guide member can be connected to the casing through fasteners without being connected; and the second guide member and the second guide section are interference fit, so that the second guide member and the second guide section basically do not move relative to each other, and the second guide member can be connected to the base plate through fasteners without being connected. In this way, when the electric column is raised or lowered, the first guide member can be raised or lowered synchronously by pulling the first guide section, and the second guide member can be raised or lowered synchronously by pulling the second guide section.

[0070] It can be understood that in other embodiments of the present invention, the positioning member can also be installed on the side of the wiring frame cover away from the transmission assembly. The positioning member is an insulating pressure plate, and the two ends of the insulating pressure plate are fixed to the wiring frame cover by screws. The positioning section is pressed between the insulating pressure plate and the wiring frame cover. Such a design can also enable the positioning member to position the positioning section on the insulating wiring frame.

[0071] Embodiment 2

[0072] like Fig.14 As shown, compared with the first embodiment, the difference of this embodiment is that the insulating pressing plate has a first end 501 and a second end 502. When the cable is in a shortened state, the first end 501 is located between the first guide section 310a and the positioning section 320, and the second end 502 is located between the second guide section 310b and the positioning section 320. The first end 501 is inclined in a direction away from the free section 330 connected between the positioning section 320 and the first guide section 310a, and the second end 502 is inclined in a direction away from the free section 330 connected between the positioning section 320 and the second guide section 310b. With such a design, when the cable is stretched, the portion of the free section 330 that contacts the end of the positioning member 500 can be prevented from being excessively bent and squeezed and damaged.

[0073] Embodiment 3

[0074] Compared with embodiments one and two, the difference of this embodiment is that the positioning piece is a plastic cable tie, the two ends of the plastic cable tie are passed through the wiring frame cover and then tied, and the positioning section is positioned on the wiring frame cover by the plastic cable tie. Such a design can not only effectively reduce the manufacturing cost of the positioning piece, but also adaptively adjust the binding according to the thickness of the positioning section, and the assembly is also relatively simple and convenient.

[0075] It can be understood that in other embodiments of the present invention, after the plastic tie is formed into a ring surrounding the outside of the positioning section, the two ends of the plastic tie are fixed on the installation wiring frame cover. Such a design can also position the positioning section on the wiring frame cover by the plastic tie.

[0076] It is understandable that in other embodiments of the present invention, the positioning member can also be fixed to the wiring frame using a plastic cable tie structure. Such a design can also enable the positioning member to position the positioning section on the insulating wiring frame, which will not be described in detail here.

[0077] Embodiment 4

[0078] Compared with the first to third embodiments, the present embodiment is different in that the transition section is freely arranged, that is, there is no connection between the transition section and the insulating wiring rack.

[0079] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Those skilled in the art should understand that the utility model includes but is not limited to the contents described in the drawings and the above specific implementation. Any modification that does not deviate from the functional and structural principles of the utility model will be included in the scope of the claims.

Claims

1. An inner-wire electric lifting column, comprising a telescopic sleeve and a transmission assembly arranged in the telescopic sleeve, wherein the transmission assembly drives the telescopic sleeve to extend and retract, wherein the telescopic sleeve comprises an inner tube, a middle tube and an outer tube which are sequentially sleeved from the inside to the outside, and the cable runs through the interior of the telescopic sleeve, wherein the cable comprises a first guide section which is guided by a first guide member and connected to the upper end of the electric lifting column, a second guide section which is guided by a second guide member and connected to the lower end of the electric lifting column, and a transition section connected between the first guide section and the second guide section, wherein the first guide section slides vertically relative to the second guide section under the drive of the upper end of the electric lifting column and realizes the retraction and extension of the cable length through the deformation of the transition section, and wherein the cable comprises: An insulating wiring rack connected to the middle tube is provided between the inner tube and the transmission assembly, and the insulating wiring rack has an isolation cavity open at the top and bottom. When the length of the cable is in a shortened state, the first guide section, the second guide section and the transition section are all located in the isolation cavity.

2. The inner-wire electric lifting column according to claim 1, characterized in that: A separation rib is provided in the isolation cavity, and the separation rib separates the interior of the isolation cavity into a first guide cavity and a second guide cavity extending vertically. The first guide member is arranged through the first guide cavity, and the second guide member is arranged through the second guide cavity.

3. The inner-wire electric lifting column according to claim 2, characterized in that: The cavity wall of the isolation cavity includes a first side wall and a second side wall which are arranged opposite to each other and extend vertically, and the dividing rib includes a first dividing rib parallel to the first side wall and a second dividing rib parallel to the second side wall, the first dividing rib and the first side wall form a partial cavity wall of the first guide cavity, and the second dividing rib and the second side wall form a partial cavity wall of the second guide cavity.

4. The inner-wire electric lifting column according to claim 2, characterized in that: When the length of the cable is in a lengthened state, the lower end of the first guide member is located in the first guide cavity, and the upper end of the second guide member is located in the second guide cavity.

5. The inner-wire electric lifting column according to claim 1, characterized in that: The insulating wiring rack includes a wiring frame and a wiring frame cover which are arranged vertically, and the wiring frame cover cooperates with the wiring frame to form the isolation cavity.

6. The inner-wire electric lifting column according to claim 5, characterized in that: The wiring frame comprises a bottom wall and side walls formed by bending opposite sides of the bottom wall in the same direction. The inner side of the side wall is provided with a vertically extending slot, and the edge of the wiring frame cover is inserted into the slot.

7. The inner-wire electric lifting column according to claim 6, characterized in that: The electric lifting column also includes a middle tube fixing seat located below the inner tube, and the transmission assembly also includes a second sleeve connected to the middle tube fixing seat, and the second sleeve drives the middle tube to rise and fall synchronously through the middle tube fixing seat, and the insulating wiring rack is connected to the middle tube fixing seat through a clamping column.

8. The inner-wire type electric lifting column according to claim 7, characterized in that: The clamping column comprises a body and elastic buckles arranged at one end of the body and arranged at circumferential intervals. The body penetrates the wiring frame cover, and the elastic buckles are clamped with the wiring frame and the middle tube fixing seat.

9. An inner-wire electric lifting column according to any one of claims 1 to 8, characterized in that: The transition section includes a positioning section positioned on the insulating wiring rack by a positioning member and a free section connected to both ends of the positioning section. When the length of the cable is in a shortened state, the first guide section and the second guide section are located on both sides of the positioning section in a horizontal direction, and the two free sections are bent in reverse and arranged at both ends of the positioning section so that the cable is placed in a Z-shape or S-shape in the isolation cavity.

10. An inner-wire electric lifting column according to any one of claims 1 to 8, characterized in that: The electric lifting column also includes a driving device, the upper end of the electric lifting column includes a housing that accommodates the driving device and is connected to the inner tube, and the lower end of the electric lifting column includes a bottom plate that is connected to the bottom end of the outer tube. The first guide member is connected to the housing through a second fastener, and the first guide member and the first guide section are relatively fixed; or the first guide member is sleeved on the outside of the first guide section, a first through hole is provided on the side wall of the first guide member, and the first guide section passes through the first through hole so that the first guide member and the first guide section are relatively fixed; The second guide member is connected to the base plate via a third fastener, and the second guide member and the second guide section remain relatively fixed; or the second guide member is sleeved on the outside of the second guide section, and the side wall of the second guide member is provided with a second through hole, and the second guide section passes through the second through hole so that the second guide member and the second guide section remain relatively fixed.

Images