An electric lifting table

Abstract

The present invention discloses an electric lift table, which includes two lifting columns, each of which is connected to a linear drive mechanism, the linear drive mechanism including a lead screw, a transmission nut, an upper limiter, and a lower limiter, the transmission nut reciprocating between the upper limiter and the lower limiter; a drive gear connected to a drive motor; and two clutch devices: a first clutch device and a second clutch device, respectively connected to the ends of the drive gear, the outer ends of the first clutch device and the outer ends of the second clutch device being connected to the lead screws in the two lifting columns. The clutch devices are used to transmit the torque of the drive motor at a rated torque, drive the lead screws in the two lifting columns to rotate, and thus the lifting columns are raised and lowered. The electric lift table has a low production cost, is not prone to errors in the lifting operation, and can effectively avoid control failure defects caused by program software errors.

Description

Technical Field

[0001] The present invention relates to the technical field of furniture equipment, in particular to an electric lifting table. Background Art

[0002] An electric lift table is an office desk with adjustable height, which can be adjusted according to a person's height, sitting posture, and standing posture. The structure of an electric lift table generally includes a table top, a crossbeam, a base, and a liftable column. The crossbeam is provided with a motor, which drives the transmission rod in the crossbeam to rotate. The two ends of the transmission rod are respectively connected to the linear lifting mechanism in the column, which is used to drive the linear lifting mechanism in the column to rotate, thereby causing the column to move up and down. The height adjustment of the electric lift table is generally achieved by controlling the motor movement with the help of additional control hardware and software to achieve the lifting and lowering adjustment of the electric lift table. The additional control hardware and software generally refer to the control panel and the circuit control program located in the control panel; therefore, its production cost is relatively high, and the software program is prone to errors, resulting in control failure, causing the column to continue to rise when it rises to the highest warning position or continue to fall when the column falls to the lowest position.

[0003] To save costs and avoid control failures caused by software errors, people have eliminated control hardware and software and instead installed a lower limit switch and an upper limit switch in sequence from bottom to top along the height direction of the column. These two limit switches are used to limit the column's lifting stroke. For example, the applicant's prior Chinese application, with publication number CN209058258U and titled "Electric Lift Table," discloses that a lower limit switch and an upper limit switch are installed in sequence from bottom to top along the height direction of the table leg. Both the lower limit switch and the upper limit switch are electrically connected to the driver's control circuit via wires. When the table leg descends to its lowest position, the lower limit switch is triggered, disconnecting the driver's control circuit and stopping the leg from descending. When the table leg ascends to its highest position, the upper limit switch is triggered, disconnecting the driver's control circuit and stopping the leg from ascending. However, for the electric lift table with this structure, both the upper and lower travel switches need to be connected to the control circuit of the driver by wires. If the wires are aged or squeezed and damaged, the upper or lower travel switch will fail, which will also cause control failure. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned prior art and provide an electric lifting table with low production cost, low error-prone lifting operation, and effective avoidance of control failure defects caused by program software errors.

[0005] The technical solution of the present invention is to provide an electric lifting table with the following structure:

[0006] Two lifting columns, each of which is connected to a linear drive mechanism, the linear drive mechanism comprising a lead screw rotatably connected to the lifting column, a drive nut threadedly connected to the lead screw, an upper limiter and a lower limiter, the drive nut reciprocating between the upper limiter and the lower limiter;

[0007] A driving gear connected to the driving motor;

[0008] Two clutch devices: a first clutch device and a second clutch device, respectively connected to the two ends of the driving gear, and the outer ends of the first clutch device and the second clutch device are respectively connected to the lead screws in the two lifting columns;

[0009] The clutch device is used to transmit the torque of the drive motor under the rated torque, drive the lead screws in the two lifting columns to rotate, and the lifting columns to perform lifting movements; and when the transmission nut and the upper limit member or the lower limit member are offset to increase the torque of the drive motor, the clutch device disengages the transmission and the lifting columns stop lifting.

[0010] After adopting the above structure, the electric lifting table of the present invention has the following advantages compared with the prior art: the electric lifting table is provided with an upper limiter and a lower limiter in the linear drive mechanism of the lifting column, and the upper limiter and the lower limiter are used for abutting the transmission nut when the lead screw rotates, or the upper limiter and the lower limiter are used for limiting the movement stroke of the transmission nut; and the electric lifting table is provided with a clutch device at both ends of the driving gear, and the clutch device can transmit the torque of the driving motor under the rated torque, but when the torque of the driving motor suddenly increases, the clutch device disengages the transmission or slips; that is, when the driving motor drives the driving gear to rotate normally, the clutch device drives the two lifting columns to rotate. The screw rotates, causing the lifting column to rise and fall. When the transmission nut contacts the upper or lower limiter, the lifting column stops rising and falling, but the drive motor is still rotating. The instantaneous torque of the drive motor increases, and the clutch device disengages the transmission or slips, preventing the torque of the drive motor from being transmitted to the screw of the lifting column, thereby protecting the linear drive mechanism. Therefore, the electric lifting table uses the clutch device and the upper and lower limiters to cooperate to protect the linear drive mechanism and the drive motor when the lifting column rises to the highest point and descends to the lowest point. This avoids the cost of using additional hardware and software program control, and can effectively prevent control failures caused by software program errors or control defects of the program itself. Therefore, the production cost of the electric lifting table is low, and the lifting operation is not prone to errors and is highly safe.

[0011] Preferably, the drive motor is connected to a hollow gear seat with open ends, and the drive gear is rotatably connected to the gear seat; the lifting column is connected to a mounting plate, the gear seat is connected to the mounting plate, and the mounting position of the gear seat on the mounting plate is adjustable. The use of the mounting plate to secure the gear seat and the drive motor, and the adjustable mounting position of the gear seat on the mounting plate, not only facilitates the installation of the gear seat and the drive motor, but also allows the gear seat to be adjusted so that its axis is aligned with the axis of the clutch device and the axis of the input end of the linear drive mechanism, thereby effectively improving transmission efficiency.

[0012] Preferably, the first clutch device includes a first rotating member that is transmission-connected to the first end of the driving gear and a first transmission member that is transmission-connected to the lifting column, a first torsion spring is sleeved on the outer wall of the first rotating member, and the inner wall of the inner ring of the first torsion spring is in contact with the outer wall of the first rotating member; a first accommodating cavity is provided at one end of the first transmission member close to the first rotating member, the first torsion spring is arranged in the first accommodating cavity and the first torsion spring is transmission-connected to the first transmission member. The inner wall of the inner ring of the first torsion spring fits against the outer wall of the first rotating part, so that there is a rotational friction force between the inner wall of the inner ring of the first torsion spring and the outer wall of the first rotating part. The friction force can make the first transmission part rotate with the first rotating part, so that the clutch device can transmit the torque of the driving motor; when the transmission nut and the upper limit member or the lower limit member offset the instantaneous torque of the driving motor, the driving gear drives the first rotating part to rotate, thereby overcoming the friction force of the inner wall of the inner ring of the first torsion spring, thereby causing the first rotating part and the first transmission part to slip or disengage from the transmission, which not only prevents the driving motor from continuing to transmit torque to the screw of the lifting column to damage the screw, but also prevents internal damage to the driving motor.

[0013] Preferably, the second clutch device includes a second rotating member that is transmission-connected to the second end of the driving gear and a second transmission member that is transmission-connected to another lifting column. A second torsion spring is sleeved on the outer wall of the second rotating member, and the inner wall of the inner ring of the second torsion spring is in contact with the outer wall of the second rotating member. A second accommodating cavity is provided at one end of the second transmission member close to the second rotating member, and the second torsion spring is arranged in the second accommodating cavity and is transmission-connected to the second transmission member. The inner wall of the inner ring of the second torsion spring fits against the outer wall of the second rotating part, so that there is a rotational friction force between the inner wall of the inner ring of the second torsion spring and the outer wall of the second rotating part. The friction force can make the second transmission part rotate with the second rotating part, so that the clutch device can transmit the torque of the driving motor; when the transmission nut and the upper limit member or the lower limit member offset the instantaneous torque of the driving motor, the driving gear drives the second rotating part to rotate, thereby overcoming the friction force of the inner wall of the inner ring of the second torsion spring, thereby causing the second rotating part and the second transmission part to slip or disengage from the transmission. This not only prevents the driving motor from continuing to transmit torque to the screw of the lifting column to damage the screw, but also prevents internal damage to the driving motor.

[0014] Preferably, the first transmission member is provided with a first notch connected to the first accommodating cavity, and the two torsion arms of the first torsion spring are arranged in the first notch and have a rotational clearance in the first notch. When the first torsion spring rotates, the first transmission member can be driven to rotate by the two torsion arms. The two torsion arms of the first torsion spring can drive the first transmission member to rotate, thereby realizing the transmission function; however, when the load-bearing capacity of the electric lifting table is large and the drive motor stops working, the linear drive mechanism in the lifting column will shrink due to the large axial pressure, and the first transmission member will be passively rotated at this time. Since the two torsion arms of the first torsion spring have a rotational clearance in the first notch, the passive rotation of the first transmission member will not directly apply torque to the first rotating member, but will first act on the first torsion spring, causing the outer diameter of the first torsion spring to become smaller and tightly hold the first rotating member, thereby realizing the self-locking function, thereby preventing the passive rotation of the first transmission member from directly applying torque to the drive gear, thereby reducing the force on the drive gear.

[0015] Preferably, the second transmission member is provided with a second notch connected to the second accommodating chamber, and the two torsion arms of the second torsion spring are arranged in the second notch and have a rotational clearance in the second notch. When the second torsion spring rotates, the second transmission member can be driven to rotate by the two torsion arms. The two torsion arms of the second torsion spring can drive the second transmission member to rotate, thereby realizing the transmission function; however, when the load-bearing capacity of the electric lifting table is large and the drive motor stops working, the linear drive mechanism in the lifting column will contract due to the large axial pressure, and the second transmission member will be passively rotated at this time. Since the two torsion arms of the second torsion spring have a rotational clearance in the second notch, the passive rotation of the second transmission member will not directly apply torque to the second rotating member, but will first act on the second torsion spring, causing the outer diameter of the second torsion spring to become smaller and tightly hold the second rotating member, thereby realizing the self-locking function, thereby preventing the passive rotation of the second transmission member from directly applying torque to the drive gear, thereby reducing the force on the drive gear.

[0016] Preferably, the gear seat is provided with a first connection portion, the first connection portion comprising two first connection grooves arranged side by side, each first connection groove having a clearance fit with a locking nut; the mounting plate is provided with a second connection portion, the second connection portion comprising two first connection holes arranged on the motor mounting plate, the two first connection holes corresponding one-to-one to the two first connection grooves; a locking screw is connected to each first connection hole, and the free end of the locking screw is inserted into the first connection groove and threadedly connected to the locking nut in the first connection groove. By inserting the locking screws into the two first connection holes and inserting the free ends of the locking screws into the first connection grooves and threadedly connected to the locking nuts in the first connection grooves, the gear seat and the drive motor can be fixed. When the gear seat is in the installed position, it is only necessary to loosen the locking screws, then adjust the vertical angle of one end of the gear seat so that the axis of the drive gear is aligned with the axis of the clutch device and the axis of the input end of the linear drive mechanism, and then tighten the locking screws, thereby ensuring the concentricity of the transmission and effectively improving the transmission efficiency.

[0017] Preferably, the first connecting portion further includes a second connecting groove, which is provided on the side wall of the gear base below the two first connecting grooves and has a locking nut loosely fitted therein. The mounting plate is provided with a second connecting hole corresponding to the second connecting groove, and a locking screw threadably engaged with the locking nut in the second connecting groove is connected therein. The second connecting hole on the mounting plate and the second connecting groove on the gear base cooperate to provide a more secure and stable connection between the gear base and the mounting plate.

[0018] Preferably, the two first connecting grooves are both located on the upper portion of the gear seat and extend through the top wall of the gear seat. Each first connecting groove includes a nut slot for receiving a locking nut, the nut slot being configured to limit axial movement of the locking nut. The locking nut has a clearance fit within the nut slot, thereby facilitating adjustment of the mounting position or angle of the gear seat.

[0019] Preferably, the second connecting groove is arranged at the lower part of the gear seat and passes through the bottom wall of the gear seat; a nut groove for accommodating a locking nut is provided in the second connecting groove, and the nut groove is arranged to limit the axial movement of the locking nut.

[0020] As an advantage, the upper stopper is an upper stopper plate connected to the upper portion of the lead screw, and the lower stopper is a lower stopper plate connected to the lower portion of the lead screw.

[0021] In summary, the beneficial effects of the electric lifting table of the present invention are: avoiding the use of additional hardware and software program control, so that the production cost is low, and the lifting operation is not prone to errors, and can effectively avoid control failure defects caused by program software errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an electric lifting table of the present invention.

[0023] Figure 2 It is a partial structural diagram of an electric lifting table of the present invention.

[0024] Figure 3 It is a schematic diagram of the assembly structure of a clutch device of an electric lifting table of the present invention.

[0025] Figure 4 This is a schematic diagram of the assembly structure of a clutch device of an electric lifting table from another angle of the present invention.

[0026] Figure 5 It is a schematic diagram of the gear seat installation structure of an electric lifting table of the present invention.

[0027] As shown in the figure:

[0028] 1. Lifting column, 2. Base, 3. Linear drive mechanism, 300. Lead screw, 301. Transmission nut, 302. Upper limit member, 303. Lower limit member, 4. Drive motor, 5. Gear seat, 500. Drive gear, 501. Drive rod, 502. First connecting groove, 503. Nut groove, 504. Locking nut, 505. Second connecting groove, 6. First clutch device, 600. First rotating member, 601. First torsion spring, 602. First torsion arm, 603. First transmission member, 604. First accommodating chamber, 605. First notch, 606. First jack, 7. Second clutch device, 700. Second rotating member, 701. Second torsion spring, 702. Second torsion arm, 703. Second transmission member, 704. Second accommodating cavity, 705. Second notch, 706. Second insertion hole, 8. Transmission rod assembly, 9. Crossbeam, 10. Mounting plate, 1000. First connecting hole, 1001. Second connecting hole, 1002. Locking screw. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] See also Figures 1 to 4 As shown;

[0031] The present invention provides an electric lifting table, whose structure includes a table top (not shown in the figure), a base 2 and two lifting columns 1. The lower ends of the two lifting columns 1 are connected to the base 2, and the upper ends of the two lifting columns 1 are connected to a beam 9, and the top of the beam 9 is connected to the table top; the electric lifting table also includes a driving motor 4, which is connected to a hollow gear seat 5 with open ends, and a driving gear 500 is rotatably connected to the gear seat 5. The rotating shaft of the driving motor 4 is coaxially connected to a worm, and the worm is in transmission connection with the driving gear 500; the lifting column 1 is connected to a mounting plate 10, and the gear seat 5 is connected to the mounting plate 10, and the mounting position of the gear seat 5 on the mounting plate 10 can be adjusted. Both lifting columns 1 are connected to a linear drive mechanism 3. The linear drive mechanism 3 comprises a lead screw 300 rotatably connected to the lifting column 1, a drive nut 301 threadedly connected to the lead screw 300, an upper stopper 302, and a lower stopper 303. The drive nut 301 reciprocates between the upper and lower stoppers 302 and 303. The upper stopper 302 is an upper limit plate connected to the upper portion of the lead screw 300, and the lower limit plate 303 is a lower limit plate connected to the lower portion of the lead screw 300. The linear drive mechanism 3 operates, thereby driving the lifting columns 1 up and down. When the lifting columns 1 are raised to their highest position, the drive nut 301 abuts against the lower stopper 303. When the lifting columns 1 are lowered to their lowest position, the drive nut 301 abuts against the upper stopper 302.

[0032] See again Figure 2 As shown, the electric lift table also includes two clutch devices: a first clutch device 6 and a second clutch device 7. The first clutch device 6 and the second clutch device 7 are respectively connected to the ends of the drive gear 500. The drive gear 500 can transmit the torque of the drive motor 4 through the two clutch devices. The outer ends of the first clutch device 6 and the outer ends of the second clutch device 7 are respectively connected to the lead screws 301 in the two lifting columns 1. The electric lift table also includes a transmission rod assembly 8. The outer ends of the first clutch device 6 and the outer ends of the second clutch device 7 are connected to the lead screws 300 in the lifting columns 1 through the transmission rod assembly 8. The clutch devices are used to transmit the torque of the drive motor 4 at rated torque, driving the lead screws 300 in the two lifting columns 1 to rotate, causing the lifting columns 1 to move upward and downward. When the transmission nut 301 contacts the upper limiter 302 or the lower limiter 303, increasing the torque of the drive motor 4, the first clutch device 6 and the second clutch device 7 are disengaged, and the lifting column 1 stops moving upward and downward.

[0033] When the drive motor 4 drives the drive gear 500 to rotate normally, the clutch device drives the screws 300 in the two lifting columns 1 to rotate, thereby raising and lowering the lifting columns 1. When the transmission nut 301 contacts the upper limiter 302 or the lower limiter 303, the lifting column 1 stops lifting, but the drive motor 4 continues to rotate. In this case, the instantaneous torque of the drive motor 4 increases, and the clutch device disengages the transmission or slips, so that the torque of the drive motor 4 is not transmitted to the screws 300 of the lifting column 1, thereby protecting the linear drive mechanism 3. Therefore, the electric lifting table uses the clutch device and the upper limiter 302 and the lower limiter 303 to protect the linear drive mechanism and the drive motor 4 when the lifting column 1 rises to the highest point and descends to the lowest point. This avoids the cost of using additional hardware and software program control and can effectively prevent control failure caused by software program errors or program control defects. Therefore, the electric lifting table has low production costs, is not prone to errors in lifting operations, and is highly safe.

[0034] See again Figure 3 and Figure 4As shown in the figure, as an embodiment of the present invention; the first clutch device 6 includes a first rotating member 600 that is transmission-connected to the first end of the driving gear 500 and a first transmission member 603 that is transmission-connected to the lifting column 1, that is, a driving rod 501 that rotates synchronously with the driving gear 500 is connected in the center hole of the driving gear 500. The driving rod 501 is a polygonal rod in this embodiment, and both ends of the driving rod are arranged on the outside of the two ends of the driving gear 500. The driving rod at the first end of the driving gear 500 is inserted into the first insertion hole 606 of the first rotating member 600, so as to make the first rotating member 600 rotate synchronously with the driving gear 500; the first transmission member 603 is coaxially connected to the transmission rod assembly 8, so that the first transmission member 603 rotates synchronously with the transmission rod assembly 8. A first torsion spring 601 is sleeved on the outer wall of the first rotating member 600, and the inner wall of the inner ring of the first torsion spring 601 is in contact with the outer wall of the first rotating member 600; a first accommodating cavity 604 is provided at one end of the first transmission member 603 close to the first rotating member 600, and the first torsion spring 601 is arranged in the first accommodating cavity 604 and the first torsion spring 601 and the first transmission member 603 are transmission-connected. The second clutch device 7 includes a second rotating member 700 that is transmission-connected to the second end of the driving gear 500 and a second transmission member 703 that is transmission-connected to another lifting column. Similarly, the driving rod at the second end of the driving gear 500 is inserted into the second insertion hole 706 of the second rotating member 700, so as to make the second rotating member 700 rotate synchronously with the driving gear 500; a second torsion spring 701 is sleeved on the outer wall of the second rotating member 700, and the inner wall of the inner ring of the second torsion spring 701 is in contact with the outer wall of the second rotating member 700; a second accommodating chamber 704 is provided at one end of the second transmission member 703 close to the second rotating member 700, and the second torsion spring 701 is arranged in the second accommodating chamber 704 and the second torsion spring 701 is transmission-connected to the second transmission member 703.The inner wall of the inner ring of the first torsion spring 601 fits with the outer wall of the first rotating member 600, so that there is a rotational friction force between the inner wall of the inner ring of the first torsion spring 601 and the outer wall of the first rotating member 600. This friction force can make the first transmission member 603 rotate with the first rotating member 600, so that the clutch device can transmit the torque of the drive motor 4; when the transmission nut 301 and the upper limit member 302 or the lower limit member 303 counteract the instantaneous torque of the drive motor 4, the driving gear 500 drives the first rotating member 600 to rotate, thereby overcoming the friction force of the inner wall of the inner ring of the first torsion spring 601, thereby causing the first rotating member 600 and the first transmission member 603 to slip or disengage from the transmission; similarly, the inner wall of the inner ring of the second torsion spring 701 fits with the outer wall of the second rotating member 700. The outer wall fits together so that there is a rotational friction force between the inner wall of the inner ring of the second torsion spring 701 and the outer wall of the second rotating member 700. This friction force can cause the second transmission member 703 to rotate with the second rotating member 700, so that the clutch device can transmit the torque of the driving motor; when the transmission nut 301 and the upper limit member 302 or the lower limit member 303 offset the instantaneous torque of the driving motor 4, the driving gear 500 drives the second rotating member 700 to rotate, thereby overcoming the friction force of the inner wall of the inner ring of the second torsion spring 701, thereby causing the second rotating member 700 to slip or disengage from the transmission; this not only prevents the driving motor 4 from continuing to transmit torque to the screw 300 of the lifting column 1 to damage the screw, but also prevents internal damage to the driving motor 4.

[0035] See again Figure 3 and Figure 4As shown in the figure, as an embodiment of the present invention, the first transmission member 603 is provided with a first notch 605 connected to the first accommodating chamber 604. The two first torsion arms 602 of the first torsion spring 601 are arranged in the first notch 605 and have a rotational clearance in the first notch 605. When the first torsion spring 601 rotates, the first transmission member 603 can be driven to rotate by the two first torsion arms 602. The second transmission member 703 is provided with a second notch 705 connected to the second accommodating chamber 704. The two second torsion arms 702 of the second torsion spring 701 are arranged in the second notch 705 and have a rotational clearance in the second notch 705. When the second torsion spring 701 rotates, the second transmission member 703 can be driven to rotate by the two second torsion arms 702. The two first torsion arms 602 of the first torsion spring 601 can drive the first transmission member 603 to rotate, and the two second torsion arms 702 of the second torsion spring 701 can drive the second transmission member 703 to rotate, thereby realizing the transmission function; however, when the load-bearing capacity of the electric lifting table is large and the driving motor 4 stops working, the linear drive mechanism 3 in the lifting column 1 will shrink due to the large axial pressure. At this time, the first transmission member 603 and the second transmission member 703 are passively rotated. Because the two first torsion arms 602 of the first torsion spring 601 have a rotation gap in the first notch 605, and the two second torsion arms 702 of the second torsion spring 701 have a rotation gap in the first notch 605, and the two The two second torsion arms 702 of the spring 701 have a rotational clearance in the second notch 705, so the passively rotating first transmission member 603 and the second transmission member 703 will not directly apply torque to the first rotating member 600 and the second rotating member 700, but will first act on the first torsion spring 601 and the second torsion spring 701, so that the outer diameter of the first torsion spring 601 becomes smaller and tightly embraces the first rotating member 600 and the outer diameter of the second torsion spring 701 becomes smaller and tightly embraces the second rotating member 700, realizing a self-locking function, avoiding the passively rotating transmission member from directly applying torque to the driving gear, and reducing the force on the driving gear.

[0036] See again Figure 5As shown, as an embodiment of the present invention; a first connecting portion is provided on the gear seat 5, and the first connecting portion includes two first connecting grooves 502 arranged side by side, and a locking nut 504 is clearance-fitted in each first connecting groove 502; a second connecting portion is provided on the mounting plate 10, and the second connecting portion includes two first connecting holes 1000 arranged on the mounting plate 10, and the two first connecting holes 1000 correspond one-to-one to the two first connecting grooves 502; a locking screw 1002 is connected in each first connecting hole 1000, and the free end of the locking screw 1002 is passed through the first connecting groove 502 and is threadedly connected to the locking nut 504 in the first connecting groove 502. The gear seat 5 and the drive motor 4 can be fixed by inserting a locking screw 1002 into the two first connecting holes 1000, and inserting the free end of the locking screw 1002 into the first connecting groove 502 and threadedly connected to the locking nut 504 in the first connecting groove 502. When the gear seat 5 is in the installation position, it is only necessary to loosen the locking screw 1002, and then adjust the up and down angles of one end of the gear seat 5 so that the axis of the drive gear 500 is on the same axis as the axis of the clutch device and the axis of the input end of the linear drive mechanism, and then tighten the locking screw 1002, thereby ensuring the concentricity of the transmission and effectively improving the transmission efficiency.

[0037] See again Figure 5 As shown in FIG. 1 , as an embodiment of the present invention, the first connecting portion further includes a second connecting groove 505, which is provided on the side wall of the gear base 5 below the two first connecting grooves 502. A locking nut is loosely fitted within the second connecting groove 505. The mounting plate 10 is provided with a second connecting hole 1001 corresponding to the second connecting groove 505. A locking screw is connected within the second connecting hole 1001 and is threadedly engaged with the locking nut within the second connecting groove 505. The two first connecting grooves 502 are both provided on the upper portion of the gear base 5 and extend through the top wall of the gear base 5. Each first connecting groove 502 is provided with a nut groove 503 for receiving a locking nut 504, which is configured to limit axial movement of the locking nut. The second connecting groove 505 is provided on the lower portion of the gear base 5 and extends through the bottom wall of the gear base 5. A nut groove is provided within the second connecting groove 505 for receiving a locking nut, which is configured to limit axial movement of the locking nut. The second connection hole 1001 on the mounting plate 10 and the second connection groove 505 on the gear seat 5 are matched and installed to make the connection between the gear seat 5 and the mounting plate 10 more firm and stable.

[0038] 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. An electric lift table, characterized by: include Two lifting columns, each of which is connected to a linear drive mechanism, the linear drive mechanism comprising a lead screw rotatably connected to the lifting column, a drive nut threadedly connected to the lead screw, an upper limiter and a lower limiter, the drive nut reciprocating between the upper limiter and the lower limiter; A driving gear connected to the driving motor; Two clutch devices: a first clutch device and a second clutch device, respectively connected to the two ends of the driving gear, and the outer ends of the first clutch device and the second clutch device are respectively connected to the lead screws in the two lifting columns; The clutch device is used to transmit the torque of the drive motor under the rated torque, driving the screws in the two lifting columns to rotate, causing the lifting columns to move up and down; and when the transmission nut and the upper limit member or the lower limit member are offset to increase the torque of the drive motor, the clutch device disengages the transmission and the lifting column stops lifting. The first clutch device includes a first rotating member that is transmission-connected to the first end of the driving gear and a first transmission member that is transmission-connected to the lifting column. A first torsion spring is sleeved on the outer wall of the first rotating member. The inner wall of the inner ring of the first torsion spring is in contact with the outer wall of the first rotating member, and the first torsion spring and the first transmission member are transmission-connected. A first notch is provided on the first transmission member. Two torsion arms of the first torsion spring are disposed in the first notch and have a rotational gap in the first notch. When the first torsion spring rotates, the first transmission member can be driven to rotate by the two torsion arms. The second clutch device includes a second rotating member that is transmission-connected to the second end of the driving gear and a second transmission member that is transmission-connected to the other lifting column. A second torsion spring is sleeved on the outer wall of the second rotating member. The inner wall of the inner ring of the second torsion spring is in contact with the outer wall of the second rotating member, and the second torsion spring and the second transmission member are transmission-connected. A second notch is provided on the second transmission member. Two torsion arms of the second torsion spring are disposed in the second notch and have a rotational clearance in the second notch. When the second torsion spring rotates, the second transmission member can be driven to rotate by the two torsion arms. When the drive motor stops working and the linear drive mechanism contracts, the first transmission member and the second transmission member rotate passively. The passively rotated first transmission member and the second transmission member first act on the first torsion spring and the second torsion spring, causing the outer diameter of the first torsion spring to decrease and tightly embrace the first rotating member, and causing the outer diameter of the second torsion spring to decrease and tightly embrace the second rotating member, thereby achieving self-locking.

2. The electric lift table according to claim 1, characterized in that: The driving motor is connected to a hollow gear seat with open ends, and the driving gear is rotatably connected to the gear seat; the lifting column is connected to a mounting plate, and the gear seat is connected to the mounting plate, and the mounting position of the gear seat on the mounting plate can be adjusted.

3. The electric lift table according to claim 1, characterized in that: A first accommodating cavity is provided at one end of the first transmission member close to the first rotating member, and the first torsion spring is arranged in the first accommodating cavity.

4. The electric lift table according to claim 1 or 3, characterized in that: A second accommodating cavity is provided at one end of the second transmission member close to the second rotating member, and the second torsion spring is arranged in the second accommodating cavity.

5. The electric lift table according to claim 3, characterized in that: The first notch on the first transmission member is communicated with the first accommodating cavity.

6. The electric lift table according to claim 4, characterized in that: The second notch on the second transmission member is communicated with the second accommodating cavity.

7. The electric lift table according to claim 2, characterized in that: The gear seat is provided with a first connecting part, which includes two first connecting grooves arranged side by side, and a locking nut is loosely fitted in each first connecting groove; a second connecting part is provided on the mounting plate, and the second connecting part includes two first connecting holes arranged on the mounting plate, and the two first connecting holes correspond one-to-one to the two first connecting grooves; a locking screw is connected in each first connecting hole, and the free end of the locking screw is passed through the first connecting groove and threadedly connected to the locking nut in the first connecting groove.

8. The electric lift table according to claim 7, characterized in that: The first connecting part also includes a second connecting groove, which is arranged on the side wall of the gear seat below the two first connecting grooves, and a locking nut is loosely fitted in the second connecting groove; a second connecting hole corresponding to the second connecting groove is provided on the mounting plate, and a locking screw is connected to the second connecting hole, which can be threadedly connected to the locking nut in the second connecting groove.

9. The electric lift table according to claim 7, characterized in that: The two first connecting grooves are both arranged on the upper part of the gear seat and pass through the top wall of the gear seat; a nut groove for accommodating a locking nut is provided in each first connecting groove, and the nut groove is configured to limit the axial movement of the locking nut.

10. The electric lift table according to claim 8, characterized in that: The second connecting groove is arranged at the lower part of the gear seat and passes through the bottom wall of the gear seat; a nut groove for accommodating a locking nut is provided in the second connecting groove, and the nut groove is arranged to limit the axial movement of the locking nut.

11. The electric lift table according to claim 1, characterized in that: The upper limiting member is an upper limiting plate connected to the upper part of the lead screw, and the lower limiting member is a lower limiting plate connected to the lower part of the lead screw.

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