A transmission assembly for lifting column

Abstract

The present invention provides a transmission assembly for a lifting column, belonging to the technical field of lifting columns. The transmission assembly for a lifting column includes a primary screw and a secondary screw, the primary screw is nested in the secondary screw and the two maintain synchronous circumferential rotation and axial relative sliding, the primary screw is provided with a primary nut, a bearing is connected between the secondary screw and the primary nut to keep the two relatively fixed axially and relatively rotating circumferentially, the secondary screw is a plastic screw, an elastic buckle is provided at the end of the secondary screw, the bearing is sleeved on the secondary screw and axially positioned by the elastic buckle. The advantage of the present invention is that the use of this structure makes it more convenient to process and assemble the transmission screw, and the present invention is used to control the lifting of columns.

Description

[Technical field]

[0001] The invention relates to a transmission assembly for a lifting column, belonging to the technical field of lifting columns. [Background technology]

[0002] Electric lifting columns are widely used in home, medical and other fields. Commonly used lifting columns usually use a screw nut mechanism to control the lifting of the column. For example, Chinese invention patent CN207016433U discloses a retractable transmission assembly device, including a hollow shaft with an external thread on the outer wall, a transmission screw located in the hollow shaft, a first sleeve with a first transmission nut and a second sleeve sleeved on the outside of the first sleeve. The transmission screw can drive the hollow shaft to rotate synchronously and the transmission screw and the hollow shaft can be relatively retracted along the axial direction. The external thread on the hollow shaft cooperates with the first transmission nut thread, and the transmission screw cooperates with the second transmission nut thread. The hollow shaft is rotatably positioned with the second transmission nut in the axial direction. With this structure, the lifting and lowering of the column can be controlled.

[0003] However, the transmission screw usually adopts aluminum wire rod or iron wire rod, which requires high processing precision, making the processing process complicated. At the same time, the assembly process of the transmission assembly requires high precision, making the assembly complicated and costly, making the processing and assembly of the transmission screw inconvenient. [Summary of the invention]

[0004] The technical problem to be solved by the present invention is to provide a transmission assembly for a lifting column, which makes the processing and assembly of the transmission screw more convenient.

[0005] In order to solve the above technical problems, the transmission assembly for the lifting column of the present invention includes a primary screw and a secondary screw, the primary screw is nested in the secondary screw and the two maintain synchronous rotation in the circumferential direction and slide relative to each other in the axial direction, the primary screw is provided with a primary nut, and a bearing is connected between the secondary screw and the primary nut so that the two maintain relative axial fixation and relative circumferential rotation, the secondary screw is a plastic screw, and an elastic buckle is provided at the end of the secondary screw, the bearing is mounted on the secondary screw and is axially positioned by the elastic buckle.

[0006] Preferably, the transmission assembly further comprises a positioning ring nested in the secondary screw rod, and an outer surface of the positioning ring contacts the elastic buckle to limit deformation of the elastic buckle.

[0007] Preferably, the secondary screw is provided with a plurality of elastic buckles along the circumferential direction, and the transmission assembly further comprises a positioning column which is inserted between adjacent elastic buckles after the bearing is installed to limit the deformation of the elastic buckles.

[0008] Preferably, the secondary screw is provided with a plurality of elastic buckles along the circumferential direction, and the positioning ring is provided with a guide column which is inserted between adjacent elastic buckles after the bearing is installed to limit the deformation of the elastic buckles.

[0009] Preferably, the positioning ring is provided with a buckle which is engaged with the secondary screw rod.

[0010] Preferably, a shaft shoulder is provided on the secondary screw rod, and both sides of the bearing are limited by elastic buckles and the shaft shoulder respectively.

[0011] Preferably, a nut buckle is provided at the end of the first-level nut, and the bearing comprises an outer ring and an inner ring, the inner ring is sleeved on the second-level screw and is axially positioned by the elastic buckle, and the outer ring is located in the first-level nut and is axially positioned by the nut buckle.

[0012] Preferably, the primary nut outer sleeve is provided with a primary sleeve for limiting the buckle deformation of the nut after the bearing is installed.

[0013] Preferably, the secondary screw thread is matched with a secondary nut and is connected to a secondary sleeve through the secondary nut. An elastic sliding ring is provided between the secondary screw and the secondary sleeve to prevent the secondary screw from shaking. The elastic sliding ring and the secondary screw maintain axial relative positioning and circumferential relative rotation, and maintain circumferential relative positioning with the secondary sleeve and axial relative sliding.

[0014] Preferably, the primary screw is provided with a spline, and the spline and the primary screw are detachably connected or are an integral structure, the spline is provided with a positioning protrusion, and the secondary screw is provided with a positioning groove engaged with the positioning protrusion, and the positioning groove extends along the axial direction of the secondary screw. The secondary screw rotates synchronously with the primary screw in the circumferential direction and slides axially relative to the primary screw by engaging the positioning groove with the positioning protrusion.

[0015] Beneficial effects of the present invention:

[0016] The secondary screw rod is a plastic screw rod. Compared with the aluminum screw rod or iron screw rod in the prior art, the plastic screw rod is cheap, has a low cost, is simple to process, and is simple and convenient to install, making the processing and assembly of the transmission screw rod more convenient. The bearing is connected to the secondary screw rod through the deformation of the elastic buckle, making it more convenient to disassemble and assemble the bearing. Axial positioning through the elastic buckle can prevent the bearing from falling off.

[0017] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings.

Brief Description of the Drawings

[0018] The present invention is further described in detail below with reference to the accompanying drawings, in which:

[0019] Figure 1 is a schematic diagram of a transmission assembly of Embodiment 1;

[0020] Figure 2 for Figure 1 An enlarged schematic diagram at C;

[0021] Figure 3 for Figure 1 An enlarged schematic diagram at D;

[0022] Figure 4 for Figure 1 An enlarged schematic diagram at E;

[0023] Figure 5 is a schematic diagram of the elastic sliding ring in the first embodiment;

[0024] Figure 6 is a schematic diagram of a positioning ring in Embodiment 1;

[0025] Figure 7 It is a schematic diagram of a primary nut in Example 1;

[0026] Figure 8 is a cross-sectional view of a transmission assembly of Embodiment 1;

[0027] Fig. 9 for Figure 8 An enlarged schematic diagram at A;

[0028] Fig.10 for Figure 8 Enlarged schematic at B.

[0029] Reference numerals:

[0030] 1. primary screw rod, 2. secondary screw rod, 3. primary nut, 4. bearing, 5. elastic buckle, 6. positioning ring, 7. primary sleeve, 8. secondary nut, 9. secondary sleeve, 10. elastic sliding ring, 11. spline, 12. guide column, 13. buckle, 14. nut buckle. [Specific implementation method]

[0031] The technical solutions of the embodiments of the present invention are explained and described below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0032] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate orientation or position relationship are based on the orientation or position relationship shown in the drawings and are only for the convenience of describing the embodiments and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] Embodiment 1:

[0034] like Figures 1 to 10 As shown, the preferred structure of the emergency stop self-locking circuit of the DC motor of this embodiment includes a primary screw rod 1 and a secondary screw rod 2, wherein the primary screw rod 1 is nested in the secondary screw rod 2 and the two maintain synchronous circumferential rotation and axial relative sliding, the primary screw rod 1 is provided with a primary nut 3, and a bearing 4 is connected between the secondary screw rod 2 and the primary nut 3 so that the two maintain axial relative fixation and circumferential relative rotation, the secondary screw rod 2 is a plastic screw rod, and an elastic buckle 5 is provided at the end of the secondary screw rod 2, and the bearing 4 is mounted on the secondary screw rod 2 and axially positioned by the elastic buckle 5.

[0035] Beneficial effects of the present invention:

[0036] The secondary screw rod 2 is a plastic screw rod. Compared with the aluminum screw rod or iron screw rod in the prior art, the plastic screw rod is cheap, has a low cost, is simple to process, and is simple and convenient to install, making the processing and assembly of the transmission screw rod more convenient. The bearing 4 is connected to the secondary screw rod 2 by deformation of the elastic buckle 5, making it more convenient to disassemble and assemble the bearing 4. Axial positioning by the elastic buckle 5 can prevent the bearing 4 from falling off.

[0037] Among them, the primary screw rod 1 is usually connected to a driving device, and the driving device drives the primary screw rod 1 to rotate. When the primary screw rod 1 rotates, it drives the secondary screw rod 2 to rotate synchronously, and at the same time drives the primary nut 3 to move along the axis. When the secondary nut 8 moves, it drives the secondary screw rod 2 to move synchronously through the bearing 4, so that the secondary screw rod 2 moves while rotating, so that the secondary screw rod 2 can be extended and retracted, and then drive the secondary sleeve 9 to extend and retract, so that the lifting column can be lifted and lowered.

[0038] In addition, the elastic buckle 5 made of plastic material has a stronger deformation ability, which is convenient for installing the bearing 4 and also makes it more convenient to process the elastic buckle 5 on the plastic screw rod.

[0039] At the same time, the primary screw rod 1 may also be a plastic screw rod, and the primary nut 3 and / or the secondary nut 8 may also be a plastic nut.

[0040] In order to prevent the elastic buckle 5 from deforming and causing the bearing 4 to loosen or fall off, in this embodiment, the transmission assembly preferably also includes a positioning ring 6 nested in the secondary screw rod 2, and the outer surface of the positioning ring 6 contacts the elastic buckle 5 to limit the deformation of the elastic buckle 5. The ring body of the positioning ring 6 presses the elastic buckle 5 so that the positioning ring 6 can limit the elastic buckle 5 from deforming and moving toward the axis of the secondary screw rod 2, so that the bearing 4 will not loosen or fall off relative to the secondary screw rod 2 due to the deformation of the elastic buckle 5, thereby making the installation of the bearing 4 more stable and firm. At the same time, the positioning ring 6 can also prevent the plastic screw rod itself from being deformed and damaged.

[0041] In order to further prevent the elastic buckle 5 from being deformed, in this embodiment, the secondary screw rod 2 is preferably provided with a plurality of elastic buckles 5 along the circumferential direction, and the positioning ring 6 is provided with a guide column 12 which is inserted between adjacent elastic buckles 5 after the bearing 4 is installed to limit the deformation of the elastic buckle 5. When the elastic buckle 5 is deformed, in addition to moving toward the axis of the secondary screw rod 2, the distance between two adjacent elastic buckles 5 will also be reduced. The guide column 12 is filled between two adjacent elastic buckles 5 to further prevent the elastic buckle 5 from being deformed. At the same time, by providing a plurality of elastic buckles 5, the movement of the bearing 4 can be limited in multiple directions along the circumference of the secondary screw rod 2 to prevent the bearing 4 from falling off.

[0042] In order to facilitate the installation and fixation of the positioning ring 6, the positioning ring 6 is preferably provided with a buckle 13 which is clamped with the secondary screw rod 2 in this embodiment. The positioning ring 6 can be installed on the secondary screw rod 2 through the buckle 13, which facilitates the installation of the positioning ring 6. A slot can be provided on the elastic buckle 5, and the buckle 13 can be positioned relative to the secondary screw rod 2 by being clamped in the slot.

[0043] In order to enable the bearing 4 to be axially positioned, in this embodiment, the secondary screw rod 2 is preferably provided with a shoulder, and the two sides of the bearing 4 are limited by the elastic buckle 5 and the shoulder respectively, so that the bearing 4 can be axially positioned under the limiting action of the elastic buckle 5 and the shoulder.

[0044] In order to enable the bearing 4 to be axially positioned relative to the primary nut 3, in this embodiment, a nut buckle 14 is preferably provided at the end of the primary nut 3, and the bearing 4 includes an outer ring and an inner ring, the inner ring is sleeved on the secondary screw 2 and is axially positioned by the elastic buckle 5, and the outer ring is located in the primary nut 3 and is axially positioned by the nut buckle 14. By providing the nut buckle 14, it can be made more convenient to install the bearing 4 on the primary nut 3.

[0045] In order to prevent the deformation of the nut buckle 14 and cause the bearing 4 to loosen or fall off, in this embodiment, the outer sleeve of the first-level nut 3 is preferably provided with a first-level sleeve 7 for limiting the deformation of the nut buckle 14 after the bearing 4 is installed. The first-level sleeve 7 is used for limiting the nut buckle 14 to prevent the nut buckle 14 from moving outward and deforming, thereby preventing the bearing 4 from loosening or falling off. At the same time, the inner ring of the bearing 4 limits the deformation of the elastic buckle 5 through the positioning ring 6 and the guide column 12, and the outer ring of the bearing 4 limits the deformation of the nut buckle 14 through the first-level sleeve 7, so that the bearing 4 is more stable and firm when positioned, and the disassembly and assembly of the bearing 4 is also more convenient.

[0046] In order to make the secondary screw rod 2 more stable, in this embodiment, the secondary screw rod 2 is preferably threadedly matched with a secondary nut 8 and connected to a secondary sleeve 9 through the secondary nut 8. An elastic sliding ring 10 is provided between the secondary screw rod 2 and the secondary sleeve 9 to prevent the secondary screw rod 2 from shaking. The elastic sliding ring 10 and the secondary screw rod 2 maintain axial relative positioning and circumferential relative rotation, and maintain circumferential relative positioning with the secondary sleeve 9 and axial relative sliding. The elastic sliding ring 10 can prevent the secondary screw rod 2 from shaking, making the secondary screw rod 2 more stable. The elastic sliding ring 10 includes a positioning ring and an elastic claw. Through the cooperation of the positioning ring and the elastic claw, the elastic sliding ring 10 can both limit the shaking of the secondary screw rod 2 and ensure that the elastic sliding ring 10 will not affect the movement of the secondary screw rod 2 and the secondary sleeve 9.

[0047] In order to enable the secondary screw rod 2 to rotate synchronously circumferentially and slide axially relative to the primary screw rod 1, in this embodiment, the primary screw rod 1 is preferably provided with a spline 11, and the spline 11 and the primary screw rod 1 are detachably connected or are an integral structure, the spline 11 is provided with a positioning protrusion, and the secondary screw rod 2 is provided with a positioning groove engaged with the positioning protrusion, and the positioning groove extends along the axial direction of the secondary screw rod 2. The secondary screw rod 2 rotates synchronously circumferentially and slides axially relative to the primary screw rod 1 by engaging the positioning groove and the positioning protrusion. The engagement of the positioning protrusion and the positioning groove of the spline 11 makes the secondary screw rod 2 rotate synchronously circumferentially and slide axially relative to the primary screw rod 1. When the spline 11 and the primary screw rod 1 are an integral structure, the processing and installation of the spline 11 can be more convenient.

[0048] Embodiment 2:

[0049] The difference between this embodiment and the first embodiment is that, in this embodiment, the secondary screw rod 2 is provided with a plurality of elastic buckles 5 along the circumferential direction, and the transmission assembly further comprises a positioning column which is inserted between adjacent elastic buckles 5 after the bearing 4 is installed to limit the deformation of the elastic buckles 5. With this structure, the deformation of the elastic buckles 5 can be limited only by the positioning column, and this embodiment can also achieve the technical effect described in the first embodiment.

[0050] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A transmission assembly for a lifting column, comprising a primary screw and a secondary screw, wherein the primary screw is nested in the secondary screw and the two keep synchronous rotation in the circumferential direction and slide relative to each other in the axial direction, the primary screw is provided with a primary nut, and a bearing is connected between the secondary screw and the primary nut to keep the two relatively fixed in the axial direction and relatively rotate in the circumferential direction, characterized in that: The secondary screw is a plastic screw, an elastic clip is provided at the end of the secondary screw, the bearing is sleeved on the secondary screw and is axially positioned by the elastic clip; the transmission assembly also includes a positioning ring nested in the secondary screw, the secondary screw is provided with a plurality of elastic clips along the circumferential direction, the transmission assembly also includes a positioning column for inserting between adjacent elastic clips after the bearing is installed to limit the deformation of the elastic clip, or the positioning ring is provided with a guide column for inserting between adjacent elastic clips after the bearing is installed to limit the deformation of the elastic clip; the outer surface of the positioning ring is in contact with the elastic clip to limit the deformation of the elastic clip; the positioning ring is provided with a clip that is engaged with the secondary screw; the primary screw is a plastic screw.

2. A transmission assembly for a lifting column according to claim 1, characterized in that: The secondary screw rod is provided with a shaft shoulder, and the two sides of the bearing are respectively limited by elastic buckles and the shaft shoulder.

3. A transmission assembly for a lifting column according to claim 1, characterized in that: A nut buckle is provided at the end of the first-level nut, and the bearing comprises an outer ring and an inner ring. The inner ring is sleeved on the second-level screw rod and is axially positioned by the elastic buckle, and the outer ring is located in the first-level nut and is axially positioned by the nut buckle.

4. A transmission assembly for a lifting column as claimed in claim 3, characterized in that: The primary nut outer sleeve is provided with a primary sleeve for limiting the buckle deformation of the nut after the bearing is installed.

5. A transmission assembly for a lifting column according to claim 1, characterized in that: The secondary screw thread is matched with a secondary nut and is connected to a secondary sleeve through the secondary nut. An elastic sliding ring is provided between the secondary screw and the secondary sleeve to prevent the secondary screw from shaking. The elastic sliding ring and the secondary screw maintain axial relative positioning and circumferential relative rotation, and maintain circumferential relative positioning with the secondary sleeve and axial relative sliding.

6. A transmission assembly for a lifting column according to claim 1, characterized in that: The primary screw rod is provided with a spline, and the spline and the primary screw rod are detachably connected or are an integral structure. The spline is provided with a positioning protrusion, and the secondary screw rod is provided with a positioning groove engaged with the positioning protrusion. The positioning groove extends along the axial direction of the secondary screw rod. The secondary screw rod rotates synchronously with the primary screw rod in the circumferential direction and slides axially relative to the primary screw rod by engaging the positioning groove with the positioning protrusion.

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