A linear transmission assembly and lifting table legs using the same

Abstract

The present invention discloses a linear transmission assembly and a lifting table leg used therein, which includes a first transmission tube connected to a driving mechanism; a first transmission nut connected to the first transmission tube; a second transmission tube sleeved on the outside of the first transmission tube and the first transmission nut, wherein the second transmission tube can rotate synchronously with the first transmission tube and the second transmission tube can slide axially relative to the first transmission tube to generate displacement; a second transmission nut connected to the second transmission tube; a third transmission tube with a clearance fit in the first transmission tube, an outer wall of which is provided with an external thread and is threadedly connected to the first transmission nut; a lead screw fixedly arranged in the third transmission tube, the lead screw being threadedly connected to the second transmission nut, the third transmission tube being axially slidable relative to the lead screw and circumferentially limited. The linear transmission assembly and the lifting table leg used therein can increase the travel of the lifting table leg, meet people's demand for maximizing the travel of the lifting table leg, and have a simple structure.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical transmission devices, in particular to a linear transmission assembly and a lifting table leg using the same. Background Art

[0002] Lifting table legs are widely used in intelligent office equipment such as electric lifting tables and electric lifting platforms, as well as in medical equipment and other fields. The structure of the lifting table legs in the existing technology generally includes a driving mechanism, an inner tube, a middle tube and an outer tube that are nested with each other and can move and retract relatively, the upper end of the inner tube is connected to the outer shell of the driving mechanism, and the lower end of the outer tube is in contact with the ground; a linear transmission assembly is arranged in the inner tube, and the linear transmission assembly includes a square support tube, a first base is connected to the inner hole of the upper end of the support tube, and a screw is connected to the inner thread of the center hole of the first base, and the first base moves together with the support tube along the length direction of the screw under the rotation of the screw; a set of square tubes arranged on the screw are slidably fitted in the support tube, and the lower end of the square tube is connected to the lower end of the outer tube through a connecting plate, and the inner hole of the square tube is connected to A second base is connected, and a wire tube is sleeved on the lead screw in the central hole of the second base, and the wire tube and the lead screw rotate synchronously, and the wire tube can slide relative to the lead screw; the driving mechanism drives the lead screw to rotate, so that the support tube and the first base move along the axial direction of the lead screw, and at the same time, the rotation of the wire tube causes the square tube and the second base to move along the length direction of the support tube, thereby realizing the expansion and contraction of the inner and outer tubes of the lifting table legs; in order to maximize the stroke of the lifting table legs, the linear transmission assembly adopts the cooperation of two pipe fittings, that is, the support tube and the square tube are mutually fitted and moved relative to each other; but the linear transmission assembly is far from meeting the demand for maximizing the stroke of the lifting table legs. Therefore, how to provide a linear transmission assembly that can maximize the stroke of the lifting table legs is a technical problem that urgently needs to be solved. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned prior art and provide a linear transmission assembly with a simple structure that can increase the stroke of the lifting table legs and meet people's demand for maximizing the stroke of the lifting table legs.

[0004] The technical solution of the present invention is to provide a linear transmission assembly with the following structure:

[0005] a first transmission tube in transmission connection with the driving mechanism;

[0006] a first transmission nut connected to the first transmission tube and rotating synchronously with the first transmission tube;

[0007] a second transmission tube, sleeved on the outside of the first transmission tube and the first transmission nut, the second transmission tube being capable of rotating synchronously with the first transmission tube and being capable of sliding axially relative to the first transmission tube to generate displacement;

[0008] a second transmission nut connected to the second transmission tube and rotating synchronously with the second transmission tube;

[0009] a third transmission tube, which is loosely fitted within the first transmission tube and has an outer thread on its outer wall and is threadably connected to the first transmission nut; the third transmission tube and the second transmission nut are axially limited, and the second transmission nut is rotatable relative to the third transmission tube, so that the third transmission tube can move axially synchronously with the second transmission nut;

[0010] The lead screw is fixedly arranged in the third transmission tube and is threadedly connected to the second transmission nut. The third transmission tube can slide axially and be circumferentially limited relative to the lead screw.

[0011] Preferably, the first transmission nut is provided with a connecting portion that fits tightly in the inner hole of the first transmission tube at one end close to the first transmission tube, and the outer wall of the first transmission nut is provided with a plurality of first radial protrusions distributed circumferentially along the first transmission nut and extending axially along the first transmission nut, and the inner circumferential wall of the second transmission tube is provided with a first sliding groove that matches and engages with the first radial protrusions and slides relative to the axial direction.

[0012] Preferably, the end of the third transmission tube close to the second transmission nut is connected to a bearing, and the bearing is connected to a receiving hole of the second transmission nut close to the end of the third transmission tube.

[0013] Preferably, a support is sleeved on the outer side of the second transmission nut, and the second transmission nut is rotatably connected in the center hole of the support, and the second transmission nut and the support are axially limited.

[0014] Preferably, the lower end of the screw is fixedly connected to the center hole of the base plate, and the upper end of the screw is coaxially connected to a slider. The outer wall of the slider is provided with a plurality of second radial protrusions distributed along the circumference of the slider and extending along the axial direction of the slider, and the inner wall of the third transmission tube is provided with a second sliding groove that is engaged with the second radial protrusions and slides relative to the axial direction.

[0015] Preferably, a driving shaft is tightly fitted in the inner hole of one end of the first transmission tube close to the driving mechanism, and the driving shaft is coaxially connected to the rotating shaft of the driving mechanism.

[0016] Preferably, a limiting hole coaxial with the central hole of the support is provided in the support, and an annular convex wall is provided on the outer side wall of the second transmission nut, and the annular convex wall can be rotatably connected in the limiting hole.

[0017] After adopting the above structure, a linear transmission assembly of the present invention has the following advantages compared with the prior art: the linear transmission assembly adopts the first transmission tube, the second transmission tube, the third transmission tube and the lead screw to cooperate to realize synchronous expansion or contraction, the driving mechanism drives the first transmission tube to rotate, and the first transmission tube synchronously drives the first transmission nut, the second transmission tube and the second transmission nut to rotate at the same time, because the first transmission nut is threadedly connected to the third transmission tube, and the lead screw is threadedly connected to the second transmission nut, the position of the lead screw is fixed and the third transmission tube and the lead screw are circumferentially limited and axially slide relative to each other, so that the third transmission tube can slide axially relative to the first transmission tube, and the second transmission tube can slide axially relative to the lead screw, thereby making the linear transmission assembly telescopic; because the linear transmission assembly adopts the first transmission tube, the second transmission tube, the third transmission tube and the lead screw to cooperate to realize Synchronous expansion or contraction, the linear transmission assembly has a large number of nested transmission tubes, resulting in a larger stroke of the linear transmission assembly. In other words, when the first transmission tube, second transmission tube, third transmission tube, and lead screw of the linear transmission assembly are fully contracted through relative sliding, their overall length is shorter, resulting in a larger stroke of the linear transmission assembly. In other words, compared with the linear transmission assembly of the prior art, when the linear transmission assembly is fully expanded to the same height, the length of the linear transmission assembly of the present invention when fully contracted is much shorter than the length of the linear transmission assembly of the prior art when fully contracted. In other words, when the linear transmission assembly is fully contracted to the same height, the length of the linear transmission assembly of the present invention when fully expanded is much longer than the length of the linear transmission assembly of the prior art when fully expanded. Therefore, the linear transmission assembly of the present invention has a larger stroke. The linear transmission assembly has a simple structure and can increase the stroke of the lifting table legs, meeting people's demand for maximizing the stroke of the lifting table legs. In addition, a bearing is connected to one end of the third transmission tube near the second transmission nut, and the bearing is connected to the accommodating hole of the second transmission nut near one end of the third transmission tube, so that the third transmission tube and the second transmission nut can rotate relative to each other and be axially limited, so that the third transmission tube and the second transmission nut can move synchronously along the axial direction, and the transmission stability and consistency are good.

[0018] Another technical solution of the present invention is to provide a lifting table leg with the following structure, which includes a first vertical tube, a second vertical tube and a third vertical tube that are sequentially installed from the inside to the outside and can slide relative to each other, and a shell fixedly connected to the upper end of the first vertical tube, a driving mechanism arranged in the shell and a linear transmission assembly that is transmission-connected to the driving mechanism, wherein the linear transmission assembly adopts the linear transmission assembly described in any of the above technical solutions; the second vertical tube is connected to the second transmission nut, and the third vertical tube is fixedly connected to the screw.

[0019] Preferably, a support is sleeved on the outer side of the second transmission nut, the second transmission nut can be rotatably connected in the center hole of the support, and the second transmission nut and the support are axially limited, and the inner wall of the second riser is fixedly connected to the outer wall of the support.

[0020] Preferably, the lower end of the lead screw is fixedly connected to the central hole of the base plate, and the base plate is fixedly connected to the inner wall of the third vertical pipe.

[0021] After adopting the above structure, the lifting table leg of the present invention has the following advantages compared with the existing technology: the lifting table leg adopts the linear transmission assembly described in any of the above technical solutions, so that the stroke of the lifting table leg is increased, meeting people's demand for maximizing the stroke of the lifting table leg, and the lifting table leg has good lifting stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a linear transmission assembly of the present invention.

[0023] Figure 2 It is a structural schematic diagram of a slider of a linear transmission assembly of the present invention.

[0024] Figure 3 It is a schematic cross-sectional structural diagram of a linear transmission assembly of the present invention.

[0025] Figure 4 It is a structural schematic diagram of the lifting table legs of the present invention.

[0026] Figure 5 It is a structural schematic diagram of a first transmission nut of a linear transmission assembly of the present invention.

[0027] Figure 6 It is a schematic cross-sectional view of the lifting table leg of the present invention.

[0028] As shown in the figure:

[0029] 1. First transmission tube, 100. Drive shaft, 2. Second transmission tube, 3. Third transmission tube, 300. Mounting step, 301. Second slide groove, 4. Lead screw, 400. Slider, 401. Second radial protrusion, 5. First transmission nut, 500. Connecting portion, 501. First radial protrusion, 6. Second transmission nut, 600. Accommodating hole, 601. Annular convex wall, 7. Bearing, 8. Support, 800. Limiting hole, 9. Bottom plate, 10. First vertical tube, 1000. Second vertical tube, 1001. Third vertical tube, 11. Housing. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] See also Figures 1 to 3 and Figure 5 As shown;

[0032] The present invention provides a linear transmission assembly, also called a linear drive mechanism, which is used to be installed in the legs of a lifting table and is used to drive the inner and outer tubes of the lifting table legs to extend and retract relative to each other. Its structure includes a first transmission tube 1 that is connected to the drive mechanism; a drive shaft 100 is tightly fitted in the inner hole of one end of the first transmission tube 1 close to the drive mechanism, and the drive shaft 100 is coaxially connected to the rotating shaft of the drive mechanism for transmission. The drive mechanism includes a housing 11 and a drive motor disposed in the housing 11. The rotating shaft of the drive motor is coaxially connected to the drive shaft 100 and is used to drive the drive shaft 100 and the first transmission tube 1 to rotate; a first transmission nut 5 is connected to the first transmission tube 1 and rotates synchronously with the first transmission tube 1; a second transmission tube 2 is sleeved on the outside of the first transmission tube 1 and the first transmission nut 5. The second transmission tube 2 can rotate synchronously with the first transmission tube 1 and the second transmission tube 2 can slide axially relative to the first transmission tube 1 to generate displacement; a second transmission nut 6 is connected to the second transmission tube 2 The third transmission tube 3 is connected to the first transmission tube 1 and rotates synchronously with the second transmission tube 2; the third transmission tube 3 is clearance-fitted in the first transmission tube 1, and an external thread is provided on its outer side wall and is threadedly connected to the first transmission nut 5. The third transmission tube 3 is axially limited by the second transmission nut 6 and the second transmission nut 6 is rotatable relative to the third transmission tube 3, so as to enable the third transmission tube 3 to move axially synchronously with the second transmission nut 6; the lead screw 4 is fixedly arranged in the third transmission tube 3, and the lead screw 4 is threadedly connected to the second transmission nut 6. The third transmission tube 3 can slide axially relative to the lead screw 4 and is circumferentially limited.This linear transmission assembly adopts the first transmission tube 1, the second transmission tube 2, the third transmission tube 3 and the lead screw 4 to achieve synchronous expansion or contraction. The driving mechanism drives the first transmission tube 1 to rotate, and the first transmission tube 1 synchronously drives the first transmission nut 5, the second transmission tube 2 and the second transmission nut 6 to rotate at the same time. Since the first transmission nut 5 is threadedly connected to the third transmission tube 3, and the lead screw 5 is threadedly connected to the second transmission nut 6, the position of the lead screw 4 is fixed and the third transmission tube 3 and the lead screw 4 are circumferentially limited and slide axially relative to each other, so that the third transmission tube 3 slides axially relative to the first transmission tube 1, and the second transmission tube 2 slides axially relative to the lead screw 4, thereby making the linear transmission assembly telescopic. Since the linear transmission assembly adopts the first transmission tube 1, the second transmission tube 2, the third transmission tube 3 and the lead screw 4 and the first transmission nut 5 and the second transmission nut 6 to cooperate The linear transmission assembly achieves synchronous expansion or contraction. The number of nested transmission tubes in the linear transmission assembly is relatively large, resulting in a larger stroke of the linear transmission assembly. In other words, when the first, second, and third transmission tubes and the lead screw of the linear transmission assembly are fully contracted through relative sliding, their overall length is relatively short, resulting in a larger stroke of the linear transmission assembly. In other words, compared with the linear transmission assembly of the prior art, when the linear transmission assembly is fully expanded to the same height, the length of the linear transmission assembly of the present invention when fully contracted is much shorter than that of the linear transmission assembly of the prior art when fully contracted. In other words, when the linear transmission assembly is fully contracted to the same height, the length of the linear transmission assembly of the present invention when fully expanded is much longer than that of the linear transmission assembly of the prior art when fully expanded. Therefore, the linear transmission assembly of the present invention has a larger stroke. The linear transmission assembly has a simple structure and can increase the stroke of the lift table legs, meeting people's demand for maximizing the stroke of the lift table legs.

[0033] See again Figure 3 and Figure 5 As shown in the figure, as an embodiment of the present invention, the end of the first transmission nut 5, which is close to the first transmission tube 1, is provided with a connecting portion 500 that fits tightly within the inner hole of the first transmission tube 1. The outer wall of the first transmission nut 5 is provided with a plurality of first radial protrusions 501 distributed circumferentially and extending axially along the first transmission nut 5. The inner wall of the second transmission tube 2 is provided with a first sliding groove that engages with the first radial protrusions 501 and slides axially relative thereto. As a result, when the first transmission tube 1 drives the first transmission nut 5 to rotate, the second transmission tube 2 rotates synchronously therewith.

[0034] See again Figure 3As shown in the figure, as an embodiment of the present invention, the end of the third transmission tube 3 near the second transmission nut 6 is connected to a bearing 7, and the bearing 7 is connected to the receiving hole 600 of the second transmission nut 6 near the end of the third transmission tube 3. The end of the third transmission tube 3 near the second transmission nut 6 is provided with a mounting step 300, and the annular ring of the bearing 7 is tightly fitted on the mounting step 300. The bearing 7 is axially limited in the receiving hole 600. In this way, when the first transmission nut 5 drives the third transmission tube 3 to move axially and the second transmission nut 6 drives the second transmission tube 2 to move axially, the third transmission tube 3 can move axially synchronously with the second transmission nut 6.

[0035] See again Figure 3 and Figure 6 As shown, as an embodiment of the present invention, a support 8 is provided on the outer side of the second transmission nut 6, and the second transmission nut 6 can be rotatably connected in the center hole of the support 8, and the second transmission nut 6 and the support 8 are axially limited. A limiting hole 800 is provided in the support 8 and is coaxial with its center hole. An annular convex wall 601 is provided on the outer wall of the second transmission nut 6, and the annular convex wall 601 can be rotatably connected in the limiting hole 800. The setting of the limiting hole 800 in the support 8 makes the second transmission tube rotate more smoothly when driving the second transmission nut 6 to rotate, and the second transmission nut 6 can drive the support 8 to move synchronously in the axial direction.

[0036] See again Figure 2 and Figure 3 As shown, as an embodiment of the present invention; the lower end of the screw 4 is fixedly connected to the center hole of the base plate 9, and the upper end of the screw 4 is coaxially connected to the slider 400, and the outer wall of the slider 400 is provided with a plurality of second radial protrusions 401 distributed circumferentially along the slider 400 and extending axially along the slider 400, and the inner wall of the third transmission tube 3 is provided with a second sliding groove 301 that is matched with the second radial protrusion 401 and slides relative to the axial direction.

[0037] See also Figure 4 and Figure 6 As shown;

[0038] The present invention provides a lifting table leg, comprising a first riser 10, a second riser 1000, and a third riser 1001, which are sequentially mounted and slidably mounted from the inside out, a housing 11 fixedly connected to the upper end of the first riser 10, a drive mechanism disposed within the housing 11, and a linear transmission assembly in transmission connection with the drive mechanism. The linear transmission assembly employs the linear transmission assembly described in any of the technical solutions of the aforementioned embodiments. The second riser 1000 is connected to a second transmission nut 6, and the third riser 1001 is fixedly connected to a lead screw 4. A support 8 is sleeved on the outer side of the second transmission nut 6, which is rotatably connected within the center hole of the support 8 and axially limited between the second transmission nut 6 and the support 8. The inner wall of the second riser 1000 is fixedly connected to the outer wall of the support 8. The lower end of the lead screw 4 is fixedly connected to the center hole of a base plate 9, which is fixedly connected to the inner wall of the third riser 1001. The lifting table leg adopts the linear transmission assembly described in any of the above technical solutions, so that the stroke of the lifting table leg is increased, meeting people's demand for maximizing the stroke of the lifting table leg, and the lifting table leg has good lifting stability.

[0039] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A linear transmission assembly, characterized in that: It includes a first transmission tube in transmission connection with the driving mechanism; a first transmission nut connected to the first transmission tube and rotating synchronously with the first transmission tube; a second transmission tube, sleeved on the outside of the first transmission tube and the first transmission nut, the second transmission tube being capable of rotating synchronously with the first transmission tube and being capable of sliding axially relative to the first transmission tube to generate displacement; a second transmission nut connected to the second transmission tube and rotating synchronously with the second transmission tube; a third transmission tube, which is loosely fitted within the first transmission tube and has an outer thread on its outer wall and is threadably connected to the first transmission nut; the third transmission tube and the second transmission nut are axially limited, and the second transmission nut is rotatable relative to the third transmission tube, so that the third transmission tube can move axially synchronously with the second transmission nut; The lead screw is fixedly arranged in the third transmission tube and is threadedly connected to the second transmission nut. The third transmission tube can slide axially and be circumferentially limited relative to the lead screw.

2. A linear transmission assembly according to claim 1, characterized in that: The first transmission nut is provided with a connecting portion that is tightly fitted in the inner hole of the first transmission tube at one end close to the first transmission tube, and the outer wall of the first transmission nut is provided with a plurality of first radial protrusions distributed along the circumference of the first transmission nut and extending axially along the first transmission nut, and the inner circumferential wall of the second transmission tube is provided with a first sliding groove that is engaged with the first radial protrusions and slides relative to the axial direction.

3. The linear transmission assembly according to claim 1, characterized in that: One end of the third transmission tube close to the second transmission nut is connected to a bearing, and the bearing is connected to a receiving hole of the second transmission nut close to the end of the third transmission tube.

4. The linear transmission assembly according to claim 3, characterized in that: A support is sleeved on the outer side of the second transmission nut. The second transmission nut is rotatably connected in the center hole of the support, and the second transmission nut and the support are axially limited.

5. The linear transmission assembly according to claim 4, characterized in that: The lower end of the lead screw is fixedly connected to the center hole of the base plate, and the upper end of the lead screw is coaxially connected to a slider. The outer wall of the slider is provided with a plurality of second radial protrusions distributed along the circumference of the slider and extending along the axial direction of the slider. The inner wall of the third transmission tube is provided with a second sliding groove that is engaged with the second radial protrusions and slides relative to the axial direction.

6. The linear transmission assembly according to claim 1, characterized in that: A driving shaft is tightly fitted in the inner hole of one end of the first transmission tube close to the driving mechanism, and the driving shaft is coaxially connected to the rotating shaft of the driving mechanism.

7. The linear transmission assembly according to claim 4, characterized in that: A limiting hole coaxial with the center hole of the support is provided in the support, and an annular convex wall is provided on the outer side wall of the second transmission nut. The annular convex wall can be rotatably connected in the limiting hole.

8. A lifting table leg comprising a first riser, a second riser, and a third riser, which are sequentially mounted and slidable relative to each other from the inside out, a housing fixedly connected to the upper end of the first riser, a drive mechanism disposed within the housing, and a linear drive assembly in transmission connection with the drive mechanism, characterized in that: The linear transmission assembly adopts the linear transmission assembly as described in any one of claims 1 to 7 above; the second vertical tube is connected to the second transmission nut, and the third vertical tube is fixedly connected to the lead screw.

9. The lifting table leg according to claim 8, characterized in that: A support is sleeved on the outer side of the second transmission nut, and the second transmission nut can be rotatably connected in the center hole of the support. The second transmission nut and the support are axially limited, and the inner wall of the second riser is fixedly connected to the outer wall of the support.

10. The lift table leg according to claim 9, characterized in that: The lower end of the lead screw is fixedly connected to the central hole of the bottom plate, and the bottom plate is fixedly connected to the inner wall of the third vertical pipe.

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