A self-locking lifting column

Abstract

The present invention discloses a self-locking lifting column, comprising a column inner tube, a column outer tube sleeved outside the column inner tube and slidably connected with the column inner tube, a motor arranged in the column inner tube and a transmission assembly, the motor drives the column outer tube to rise and fall through the transmission assembly, the motor is a double-headed motor, the output end on one side of the double-headed motor is connected to the transmission assembly, and the output end on the other side is provided with a first self-locking device, the first self-locking device comprises a first worm connected to the output end of the double-headed motor, a first worm gear matched with the first worm, and a first torsion spring sleeved on the first worm gear and rotated by the first worm gear to hold the first worm gear tightly. The present invention holds the outer wall of the first worm gear tightly through the first torsion spring to prevent the first worm gear from rotating, so as to realize the self-locking of the lifting column by the first self-locking device, prevent the outer tube of the lifting column from automatically falling due to insufficient locking force, ensure the stability of the lifting column, and have a good self-locking effect and high safety.

Description

Technical Field

[0001] The invention belongs to the field of lifting columns, and in particular relates to a lifting column that is easy to self-lock. Background Art

[0002] The lifting column usually includes an inner column tube, an outer column tube sleeved outside the inner column tube and slidably connected with the inner column tube, a motor arranged in the inner column tube, and a transmission assembly. The motor drives the outer column tube to rise and fall through the transmission assembly. The lifting speed of the lifting column in the prior art is fast, but the self-locking ability is poor. After the lifting column rises to a certain height, the motor stops working, and the outer column tube is easy to slide downward under the action of the load, causing the lifting column to be unable to stabilize at a certain height, with poor stability. At the same time, it is easy to injure users during the sliding process, with poor safety. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a self-locking lifting column which can prevent the column from falling freely.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: a self-locking lifting column, comprising an inner tube of the column, an outer tube of the column which is sleeved on the outside of the inner tube of the column and slidably connected with the inner tube of the column, a motor arranged in the inner tube of the column and a transmission assembly, the motor drives the outer tube of the column to rise and fall through the transmission assembly, the motor is a double-headed motor, the output end on one side of the double-headed motor is connected to the transmission assembly, and the output end on the other side is provided with a first self-locking device, the first self-locking device comprises a first worm connected to the output end of the double-headed motor, a first worm wheel matched with the first worm, and a first torsion spring sleeved on the first worm wheel and rotated by the first worm wheel to clamp the first worm wheel.

[0005] Furthermore, a positioning bracket is provided on the motor to prevent the first worm from shaking.

[0006] Furthermore, the first worm gear is arranged on the positioning bracket, the first worm gear includes a wheel body and gear teeth surrounding the wheel body, the gear teeth cooperate with the first worm, and the first torsion spring is sleeved on the wheel body and one end is fixed on the positioning bracket.

[0007] Furthermore, the first worm and the output end of the double-headed motor are an integrated structure.

[0008] Furthermore, the transmission assembly includes a lifting component that drives the outer tube to rise and fall, and a reduction component that connects the lifting component and the motor.

[0009] Furthermore, a second worm is provided at the output end of the double-headed motor connected to the reduction assembly, and the reduction assembly includes a second worm wheel matched with the second worm.

[0010] Furthermore, the reduction assembly also includes a first bevel gear connected to and linked with the second worm gear and a second bevel gear meshing with the first bevel gear, and the second bevel gear is connected to the lifting assembly.

[0011] Furthermore, the lifting column also includes a second self-locking device, which includes a transmission spur gear connected to and linked with the second bevel gear, a locking spur gear meshing with the transmission spur gear, and a second torsion spring sleeved on the locking spur gear and clamped by the locking spur gear through the rotation of the locking spur gear.

[0012] Furthermore, the lifting assembly includes a small screw connected to the reduction assembly, a large screw sleeved on the outside of the small screw and an assembly inner tube sleeved on the outside of the large screw, a small screw nut matching the small screw is provided at the bottom of the large screw, the small screw drives the large screw to rotate through the spline at the top, and a large screw nut matching the large screw is provided at the bottom of the assembly inner tube.

[0013] Furthermore, the small screw nut is provided with an assembly outer tube which is sleeved on the outside of the assembly inner tube.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] When the double-headed motor is working, the output end of the lower end of the double-headed motor is connected to the transmission assembly, and the outer tube of the column is driven to rise or fall through the transmission assembly. At the same time, the output end of the upper end of the double-headed motor drives the first worm wheel to rotate through the first worm. It is stipulated that the rotation direction of the first worm wheel is forward when the outer tube of the column rises, and the rotation direction of the first worm wheel is reverse when the outer tube of the column falls. When the outer tube of the column rises, the first worm wheel rotates forward, the first torsion spring is in a relaxed state, and the friction between the first torsion spring sleeved on the first worm wheel and the first worm wheel is small, which does not affect the rotation of the first worm wheel; when the outer tube of the column falls, the first worm wheel reverses, and the first torsion spring clamps on the outer wall of the first worm wheel to prevent the first worm wheel from rotating. At this time, the output shaft of the double-headed motor overcomes the clamping force of the first torsion spring on the first worm wheel, and drives the outer tube of the column to fall through the transmission assembly. When the double-headed motor stops working, if the outer tube of the column is to drop under the action of the load, the transmission assembly will drive the output shaft of the double-headed motor to reverse. At this time, the first torsion spring is tightly clamped on the outer wall of the first worm gear to prevent the first worm gear from rotating. At this time, the load on the outer tube of the column is not enough to overcome the clamping force of the first torsion spring on the first worm gear, so the outer tube of the column cannot drop, thereby realizing the self-locking of the lifting column by the first self-locking device, preventing the outer tube of the lifting column from automatically dropping due to insufficient locking force, thereby ensuring the stability of the lifting column, with good self-locking effect and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0017] Figure 1 A three-dimensional diagram of a self-locking lifting column of the present invention;

[0018] Figure 2 A cross-sectional view of a self-locking lifting column of the present invention Figure 1 ;

[0019] Figure 3 A cross-sectional view of a self-locking lifting column of the present invention Figure 2 ;

[0020] Figure 4 It is a schematic diagram of a double-head motor and a reduction assembly;

[0021] Figure 5 Schematic diagram of the deceleration assembly and the second self-locking device Figure 1 ;

[0022] Figure 6 Schematic diagram of the deceleration assembly and the second self-locking device Figure 2 .

[0023] Among them: 1. column inner tube; 2. column outer tube; 3. double-headed motor; 31. output shaft; 32. second worm; 41. lifting assembly; 411. small screw; 412. large screw; 413. assembly inner tube; 414. assembly outer tube; 415. small screw nut; 416. large screw nut; 417. spline; 42. reduction assembly; 421. housing; 422. second worm gear; 423. first bevel gear; 424. second bevel gear; 51. first worm; 52. first worm gear; 521. wheel body; 522. gear teeth; 53. first torsion spring; 6. positioning bracket; 61. positioning hole; 71. transmission spur gear; 72. locking spur gear; 73. second torsion spring. DETAILED DESCRIPTION

[0024] Reference Figures 1 to 6 An embodiment of a self-locking lifting column of the present invention is further described.

[0025] A self-locking lifting column comprises a column inner tube 1, a column outer tube 2 which is sleeved on the outside of the column inner tube 1 and slidably connected to the column inner tube 1, a motor and a transmission assembly arranged in the column inner tube 1, wherein the motor drives the column outer tube 2 to rise and fall through the transmission assembly, and the motor is a double-headed motor 3, wherein the output end on one side of the double-headed motor 3 is connected to the transmission assembly, and the output end on the other side is provided with a first self-locking device, wherein the first self-locking device comprises a first worm 51 connected to the output end of the double-headed motor 3, a first worm wheel 52 which cooperates with the first worm 51, and a first torsion spring 53 which is sleeved on the first worm wheel 52 and rotates through the first worm wheel 52 to hold the first worm wheel 52 tightly.

[0026] Embodiment 1:

[0027] A self-locking lifting column, such as Figure 1As shown, it includes a column inner tube 1, a column outer tube 2 that is sleeved on the outside of the column inner tube 1 and slidably connected to the column inner tube 1, a motor and a transmission assembly arranged in the column inner tube 1, the motor drives the column outer tube 2 to rise and fall through the transmission assembly, the motor is a double-headed motor 3, and both ends of the double-headed motor 3, that is, the motor output shaft 31 are output ends, the output end on one side of the double-headed motor 3 is connected to the transmission assembly, and the output end on the other side is provided with a first self-locking device, the first self-locking device includes a first worm 51 connected to the output end of the double-headed motor 3, a first worm wheel 52 matched with the first worm 51, and a first torsion spring 53 sleeved on the first worm wheel 52 and rotated by the first worm wheel 52 to hold the first worm wheel 52, the first worm 51 and the output end of the double-headed motor 3 are an integrated structure, which simplifies the installation steps and ensures the locking effect of the first worm wheel 52 on the double-headed motor 3 through the first worm 51.

[0028] When the double-head motor 3 is working, Figures 2 to 4 As shown, the output end of the lower end of the double-headed motor 3 is connected to the transmission assembly, and the column outer tube 2 is driven to rise or fall through the transmission assembly. At the same time, the output end of the upper end of the double-headed motor 3 drives the first worm wheel 52 to rotate through the first worm 51. It is stipulated that when the column outer tube 2 rises, the rotation direction of the first worm wheel 52 is forward rotation, and when the column outer tube 2 falls, the rotation direction of the first worm wheel 52 is reverse rotation. When the column outer tube 2 rises, the first worm wheel 52 rotates forward, the first torsion spring 53 is in a relaxed state, and the friction between the first torsion spring 53 sleeved on the first worm wheel 52 and the first worm wheel 52 is small, which does not affect the rotation of the first worm wheel 52; when the column outer tube 2 falls, the first worm wheel 52 reverses, and the first torsion spring 53 is tightly attached to the outer wall of the first worm wheel 52 to prevent the first worm wheel 52 from rotating. At this time, the output shaft 31 of the double-headed motor 3 overcomes the clamping force of the first torsion spring 53 on the first worm wheel 52, and drives the column outer tube 2 to fall through the transmission assembly.

[0029] When the double-headed motor 3 stops working, if the column outer tube 2 is to descend under the action of load, the transmission assembly will drive the output shaft 31 of the double-headed motor 3 to reverse. At this time, the first torsion spring 53 is tightly clamped on the outer wall of the first worm gear 52 to prevent the first worm gear 52 from rotating. At this time, the load of the column outer tube 2 is not enough to overcome the clamping force of the first torsion spring 53 on the first worm gear 52, so the column outer tube 2 cannot descend, thereby realizing the self-locking of the lifting column by the first self-locking device, preventing the outer tube of the lifting column from automatically descending due to insufficient locking force, thereby ensuring the stability of the lifting column, and having a good self-locking effect and high safety.

[0030] The motor in this embodiment is provided with a positioning bracket 6 for preventing the first worm 51 from shaking. The positioning bracket 6 is installed on the housing of the double-headed motor 3. The top end of the first worm 51 passes through a positioning hole 61 provided on the positioning bracket 6 to limit the first worm 51 in the horizontal direction. The first worm 51 can rotate in the positioning hole 61, and the positioning hole 61 can prevent the end of the first worm 51 from shaking, thereby ensuring that the first worm 51 and the first worm wheel 52 are always meshed, thereby ensuring the locking effect of the first self-locking device.

[0031] In this embodiment, the first worm gear 52 is arranged on the positioning bracket 6. The first worm gear 52 includes a wheel body 521 and gear teeth 522 surrounding the wheel body 521. The gear teeth 522 are only arranged on a part of the side of the wheel body 521. The gear teeth 522 cooperate with the first worm 51. The first torsion spring 53 is sleeved on the wheel body 521 and one end is fixed on the positioning bracket 6. The first torsion spring 53 locks the first worm gear 52 by holding the wheel body 521 tightly, and does not affect the transmission of the first worm 51 and the gear teeth 522.

[0032] The transmission assembly in this embodiment includes a lifting assembly 41 and a speed reduction assembly 42 .

[0033] The lifting assembly 41 includes a small screw 411, a large screw 412, an assembly inner tube 413 and an assembly outer tube 414. The small screw 411 is connected to the reduction assembly 42, the large screw 412 is sleeved on the outside of the small screw 411, the assembly inner tube 413 is sleeved on the outside of the large screw 412, and the assembly outer tube 414 is sleeved on the outside of the assembly inner tube 413, so that the lifting of the assembly inner tube 413 is more stable. A small screw nut 415 that cooperates with the small screw 411 is fixed at the bottom of the large screw 412. When the small screw 411 rotates, the small screw nut 415 drives the large screw 412 to move upward or downward. A spline 417 is provided at the top of the small screw 411. The small screw 411 cooperates with the inner wall of the large screw 412 through the spline 417 to drive the large screw 412 to rotate, so that the large screw 412 moves up and down along the small screw 411 and rotates together with the small screw 411. A large screw nut 416 that matches the large screw 412 is fixed to the bottom of the assembly inner tube 413. When the large screw 412 rotates, the large screw nut 416 drives the assembly inner tube 413 to move upward or downward. The bottom of the assembly outer tube 414 is fixed to the small screw nut 415. When the small screw nut 415 moves up and down along the small screw 411, the assembly outer tube 414 moves together with the small screw nut 415.

[0034] The operating principle of the lifting assembly 41 is as follows: the small screw 411 rotates, driving the small screw nut 415, the large screw 412 and the assembly outer tube 414 to move upward (or downward) relative to the small screw 411, driving the large screw 412 to move upward (or downward) and driving the large screw 412 to rotate at the same time. The large screw 412 rotates, driving the large screw nut 416 and the assembly inner tube 413 to move upward (or downward) relative to the large screw 412 and the assembly outer tube 414, so that the assembly outer tube 414 and the assembly inner tube 413 rise or fall at the same time, the rising (or falling) speed of the assembly inner tube 413 is greater than the rising (or falling) speed of the assembly outer tube 414, and the top of the assembly inner tube 413 is connected to the column outer tube 2, pushing the column outer tube 2 to rise and fall, thereby achieving the effect of rapid lifting and lowering of the column outer tube 2.

[0035] The reduction assembly 42 includes a housing 421, a second worm gear 422 arranged in the housing 421, a first bevel gear 423 connected to and linked with the second worm gear 422, and a second bevel gear 424 meshing with the first bevel gear 423, the second bevel gear 424 is connected to the small screw 411, the small screw 411 is linked with the second bevel gear 424, the lower end of the output shaft 31 of the double-headed motor 3 is provided with a second worm 32, the second worm 32 cooperates with the second worm gear 422 to realize the transmission between the double-headed motor 3 and the reduction assembly 42, the output shaft 31 of the double-headed motor 3 drives the second worm 32 to rotate, the second worm 32 drives the second worm gear 422 to rotate, and at the same time realizes the deceleration of the transmission process, the second worm gear 422 drives the first bevel gear 423 to rotate together with the second worm gear 422, the first bevel gear 423 is meshed with the second bevel gear 424 for transmission, and the second bevel gear 424 drives the small screw 411 to rotate to realize the transmission between the reduction assembly 42 and the lifting assembly 41. The provision of the deceleration assembly 42 greatly reduces the transmission speed, prevents the double-headed motor 3 from outputting an excessively fast rotation speed which would cause damage to the lifting assembly 41 , and prolongs the service life of the lifting assembly 41 .

[0036] The lifting column in this embodiment also includes a second self-locking device, such as Figure 5 and Figure 6As shown, the second self-locking device is arranged in the housing 421 of the reduction assembly 42, and the second self-locking device includes a transmission spur gear 71 connected and linked to the second bevel gear 424, a locking spur gear 72 meshing with the transmission spur gear 71, and a second torsion spring 73 sleeved on the locking spur gear 72 and rotating the locking spur gear 72 to hold the locking spur gear 72. One end of the second torsion spring 73 is fixed on the housing 421, and the transmission spur gear 71 rotates with the second bevel gear 424. When the column outer tube 2 is about to descend under the action of the load, The small screw rod 411 will rotate, and the rotating small screw rod 411 will drive the second bevel gear 424 and the transmission spur gear 71 to rotate. The rotation of the transmission spur gear 71 will drive the locking spur gear 72 to rotate. The second torsion spring 73 sleeved on the locking spur gear 72 will hold the locking spur gear 72. The huge friction force between the second torsion spring 73 and the locking spur gear 72 will prevent the locking spur gear 72 from rotating, thereby preventing the column outer tube 2 from descending, thereby achieving a locking effect. By combining the second self-locking device with the first self-locking device, a better locking effect can be achieved.

[0037] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A self-locking lifting column, comprising a column inner tube, a column outer tube sleeved outside the column inner tube and slidably connected to the column inner tube, a motor arranged in the column inner tube and a transmission assembly, wherein the motor drives the column outer tube to rise and fall through the transmission assembly, and is characterized in that: The motor is a double-headed motor, the output end of one side of the double-headed motor is connected to the transmission assembly, and the output end of the other side is provided with a first self-locking device, the first self-locking device includes a first worm connected to the output end of the double-headed motor, a first worm wheel matched with the first worm, and a first torsion spring sleeved on the first worm wheel and rotated by the first worm wheel to clamp the first worm wheel.

2. The self-locking lifting column according to claim 1, characterized in that: The motor is provided with a positioning bracket for preventing the first worm from shaking.

3. The self-locking lifting column according to claim 2, characterized in that: The first worm wheel is arranged on the positioning bracket, and the first worm wheel comprises a wheel body and gear teeth surrounding the wheel body, the gear teeth cooperate with the first worm, and the first torsion spring is sleeved on the wheel body and one end of the first torsion spring is fixed on the positioning bracket.

4. The self-locking lifting column according to claim 1, characterized in that: The first worm and the output end of the double-headed motor are an integrated structure.

5. A self-locking lifting column according to any one of claims 1 to 4, characterized in that: The transmission assembly includes a lifting component for pushing the outer tube to rise and fall, and a speed reduction component connecting the lifting component and the motor.

6. The self-locking lifting column according to claim 5, characterized in that: The output end of the double-headed motor connected to the reduction assembly is provided with a second worm, and the reduction assembly includes a second worm wheel matched with the second worm.

7. The self-locking lifting column according to claim 6, characterized in that: The reduction assembly further includes a first bevel gear connected to and linked with the second worm gear and a second bevel gear meshing with the first bevel gear, wherein the second bevel gear is connected to the lifting assembly.

8. The self-locking lifting column according to claim 1, characterized in that: The lifting column also includes a second self-locking device, which includes a transmission spur gear connected to and linked with the second bevel gear, a locking spur gear meshing with the transmission spur gear, and a second torsion spring sleeved on the locking spur gear and clamped by the locking spur gear through the rotation of the locking spur gear.

9. The self-locking lifting column according to claim 5, characterized in that: The lifting assembly includes a small screw connected to the reduction assembly, a large screw sleeved on the outside of the small screw and an assembly inner tube sleeved on the outside of the large screw, a small screw nut matching the small screw is provided at the bottom of the large screw, the small screw drives the large screw to rotate through the spline on the top, and a large screw nut matching the large screw is provided at the bottom of the assembly inner tube.

10. The self-locking lifting column according to claim 9, characterized in that: The small screw nut is provided with an assembly outer tube which is sleeved on the outside of the assembly inner tube.

Images