Electric lifting stand column

Abstract

The utility model relates to the technical field of smart home, in particular to an electric lifting stand column, a transmission assembly is arranged in a telescopic sleeve assembly and drives the telescopic sleeve assembly to stretch out and draw back in the axial direction, the telescopic sleeve assembly at least comprises a first sleeve and a second sleeve, and a driving unit comprises a driving motor and a speed reduction module. A box body is fixedly arranged at the end of the first sleeve or the second sleeve, the driving motor is arranged in the box body, and at least one sensor for detecting deformation of the inner wall of the box body is arranged on the inner wall of the box body. According to the utility model, the sensor for detecting the deformation of the object is arranged on the side wall of the box body or the casing pipe, the deformation generated by the stress of the side wall of the box body or the casing pipe is directly detected, the sensor transmits an electric signal generated by the deformation to the controller, and the controller judges whether to execute an obstacle-encountering rollback instruction or not. The sensor is arranged on the side wall of the box body or the sleeve, and different from a traditional fixing mode that the sensor is arranged on a transmission assembly, detected stress signals are more direct and are not limited by a special transmission assembly structure.

Description

Technical Field

[0001] The utility model relates to the technical field of smart home, in particular to an electric lifting column that can retreat when encountering an obstacle. Background Art

[0002] An electric lifting table is a smart furniture product that relies on a motor to drive the telescopic movement of a lifting column to adjust the height of the tabletop. Therefore, the electric lifting column is its core component. During the lifting process of the electric lifting table, it may touch sundries such as chairs and cabinets, and in more serious cases, it may even pinch a person. Therefore, once an obstacle is encountered during the operation of the electric lifting table, it needs to immediately stop running and reverse for a certain distance. Technically, there are various solutions to achieve obstacle-retreating, which can be classified according to the detection method: current detection technology, gyroscope detection technology, pressure detection technology, grating detection technology, etc.

[0003] It has been proven by practice that current detection and gyroscope detection have the disadvantages of high misjudgment probability, poor sensitivity, and large triggering force, while grating detection has the disadvantages of limited detection range and extremely high cost. The pressure detection technology has the advantage of high sensitivity.

[0004] Patents WO2013159776A1 and US20110061570 disclose a structure in which an annular piezoresistive element is arranged on a transmission component, and the obstacle-retreating is realized by detecting the pressure change of the transmission component through the annular piezoresistive element. Patents CN217756785U and CN217756784U disclose a structure in which a strip-shaped piezoresistive element is arranged on an obstacle detection plate of a transmission component, and the obstacle-retreating is realized by detecting the force change of the obstacle detection plate through the strip-shaped piezoresistive element.

[0005] In the technical solutions disclosed in the above patents, the piezoresistive elements with detection functions are all arranged on the transmission component. The internal force interference of the transmission component (poor manufacturing accuracy of the transmission component, or mixing of impurities, or inconsistent tightness after assembly of the telescopic sleeve component) will cause false alarms of the piezoresistive element signals, resulting in incorrect instructions issued by the control box. Second, the space on the transmission component where the piezoresistive element can be arranged is very limited, and the sensitivity of the piezoresistive element is strongly related to the size of the piezoresistive element. Therefore, restricted by the structure of the transmission component, the size of the piezoresistive element is small and the sensitivity is not high. Third, the piezoresistive element is placed between the transmission component and the driving motor, and the heat generated during the operation of the driving motor will have a great impact on the detection accuracy and bonding strength of the sensor. Fourth, since the transmission components are all specially designed and have complex structures, and the piezoresistive element is placed between the transmission component and the driving motor, the driving motor needs to be removed first before replacing the sensor when replacing the piezoresistive element. Therefore, the maintenance of the sensor is not convenient enough. Fifth, when the piezoresistive element is arranged on the transmission component, it has a good detection effect on the vertical force, but the detection effect on the horizontal force is poor. Especially when there is no pressure conduction from the installation part of the lifting column to the transmission component, the piezoresistive element arranged on the transmission component cannot detect the pressure change. Summary of the Invention

[0006] The object of the present utility model is to provide an electric lifting column that can retract when encountering an obstacle in view of the deficiencies of the prior art.

[0007] The technical solution for achieving the object of the present utility model is: an electric lifting column, including a telescopic sleeve assembly, a transmission assembly, and a driving unit. The transmission assembly is disposed inside the telescopic sleeve assembly and drives the telescopic sleeve assembly to axially expand and contract. The telescopic sleeve assembly at least includes a first sleeve and a second sleeve. The driving unit includes a driving motor and a reduction module. A box body is fixedly provided at the end of the first sleeve or the second sleeve. The driving motor is disposed inside the box body, and at least one sensor for detecting the deformation of the inner wall of the box body is provided on the inner wall of the box body; or the driving motor is disposed inside the telescopic sleeve assembly, and at least one sensor for detecting the deformation of the inner wall of the sleeve is provided on the inner wall of the sleeve on the same side as the driving motor; or the reduction module is disposed inside the telescopic sleeve assembly, and at least one sensor for detecting the deformation of the inner wall of the sleeve is provided on the inner wall of the sleeve on the same side as the reduction module.

[0008] Further, an installation part is provided on the inner wall of the box body or the telescopic sleeve assembly, and the sensor is disposed on the installation part or at a position adjacent to the installation part.

[0009] Further, the installation part is an installation hole or an installation boss provided on the inner wall of the box body, or the installation part is an end plate provided on the telescopic sleeve assembly or the inner wall of the telescopic sleeve assembly.

[0010] Further, the inner wall of the box body includes a side wall and a bottom plate, and the sensor is disposed on the side wall.

[0011] Further, a plurality of through parts for increasing the deformation amount of the side wall are provided on the side wall.

[0012] Further, the thickness of the side wall is 1.5 - 3.5 mm.

[0013] Further, the number of the sensors is 2, and the sensors are disposed on opposite side walls.

[0014] Further, the sensor is circular or rectangular or annular or C-shaped or strip-shaped.

[0015] Further, the rectangular or strip-shaped sensor is pasted on the side wall of the box body, and the included angle with the vertical direction of the box body is 15 - 75 degrees.

[0016] Further, the rectangular or strip-shaped sensor is pasted on the inner wall of the telescopic sleeve assembly, and the included angle with the vertical direction is 15 - 75 degrees.

[0017] Further, the sensor is a strain gauge, a ceramic piezoelectric element or a quartz piezoelectric element.

[0018] Further, the drive motor is located inside or outside the telescopic sleeve assembly, the reduction module is arranged inside the telescopic sleeve assembly, the drive motor is in transmission connection with the reduction module, and the reduction module is in transmission connection with the transmission assembly.

[0019] The telescopic sleeve assembly is composed of a second sleeve, an intermediate sleeve and a first sleeve which are nested. The box body is fixedly arranged at the end of the first sleeve. The first sleeve is provided with a connecting piece for rotary motion. The connecting piece drives the connecting pipe to rotate. The connecting pipe drives the hollow lead screw to rotate. A hollow lead screw nut fixedly connected to the other end of the first sleeve is sleeved on the hollow lead screw. The end of the hollow lead screw is fixedly connected with a solid lead screw nut. The solid lead screw nut can rotate around the axis and is clamped in a groove fixed to the intermediate sleeve. The solid lead screw nut is also sleeved with a solid lead screw. The solid lead screw is fixedly connected to the bottom end of the second sleeve.

[0020] Adopting the above technical solutions, the utility model has the following beneficial effects:

[0021] (1) In the utility model, the sensor for detecting the deformation of an object is arranged on the side wall of the box body or the sleeve, directly detecting the deformation generated by the force on the side wall of the box body or the sleeve. The sensor transmits the electrical signal generated by the deformation to the controller, and the controller judges whether to execute the instruction of retracting when encountering resistance. The sensor is arranged on the side wall of the box body or the sleeve, which is different from the traditional fixing method of arranging the sensor on the transmission component. The detected force signal is more direct and is not limited by the special structure of the transmission component. The sensor can be applied to conventional double-motor lifting columns, single-motor lifting columns and built-in lifting columns, expanding the application range of such sensors. The position of the sensor in the utility model is set at the part of the electric lifting table directly bearing external forces, and not only can the external acting component force in the vertical direction be detected, but also the acting component force in the horizontal direction can be detected.

[0022] (2) In the utility model, the sensor is arranged on the side wall of the box body or the sleeve, which is convenient for installation and maintenance. The sensor can be installed or replaced without disassembling the motor, improving the production efficiency.

[0023] (3) In the utility model, the sensor is arranged on the side wall of the box body or the sleeve, far away from the drive motor, reducing the influence of the heat accumulation of the motor on the bonding strength and detection accuracy of the sensor.

[0024] (4) In the utility model, a piezoelectric ceramic strain gauge is used as the sensor. The setting position is less affected by space limitations. The sensor has a large size, high detection accuracy, high sensitivity and good use effect, improving the sensitivity and reliability of the function of retracting when encountering resistance.

[0025] (5) Compared with the strain gauge being provided on the transmission component, the side wall of the box body and the inner wall of the sleeve have a larger space, and multiple piezoelectric ceramic strain gauges can be simultaneously provided on multiple side walls, improving the detection accuracy and significantly reducing the probability of false triggering.

[0026] (6) The position of the sensor of the present utility model is set at the part of the electric lifting table that only bears external forces, and is not affected by the internal force interference of the lifting column, with high detection accuracy and a small probability of false triggering. Description of the Drawings

[0027] In order to make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to specific embodiments in combination with the drawings, where:

[0028] Figure 1 Schematic diagram of the connection structure between the lifting column and the frame of the present utility model;

[0029] Figure 2 Schematic diagram of the structure of the lifting column in the first embodiment of the present utility model;

[0030] Figure 3 Schematic diagram of the connection between the installation part and the frame in the first embodiment of the present utility model;

[0031] Figure 4 Schematic diagram of the structure of the C-shaped ceramic piezoelectric element in the first embodiment of the present utility model;

[0032] Figure 5 Schematic diagram of the structure of the strip-shaped ceramic piezoelectric element of the present utility model;

[0033] Figure 6 Schematic diagram of the deformation of the side wall of the box body under an external force in the first embodiment of the present utility model;

[0034] Figure 7 Waveform diagram of the electrical signal output after the ceramic piezoelectric element of the present utility model is stressed;

[0035] Figure 8 Schematic diagram of the installation position of the sensor in the lifting column in the second embodiment of the present utility model;

[0036] Figure 9 Schematic diagram of the installation position of the sensor in the lifting column in the third embodiment of the present utility model.

[0037] The reference numerals in the drawings are:

[0038] 11-box body; 12-side wall; 12a-mounting part; 13-sensor; 13a-piezoelectric ceramic plate; 13b-metal plate; 13c-wire; 14-drive motor; 15-first sleeve; 16-middle sleeve; 17-second sleeve; 18-mounting plate; 20-frame; 20a-slot; 30-transmission assembly; 31-connecting part; 32-connecting tube; 33-hollow screw; 34-solid screw; 35-hollow screw nut; 36-solid screw nut. DETAILED DESCRIPTION

[0039] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0040] The main components of an electric lift table are the desktop, a frame set under the desktop, and an electric lift column connected to the frame. The desktop height can be adjusted by extending and retracting the electric lift column.

[0041] During the lifting process, the tabletop of an electric lift table may come into contact with objects such as chairs and cabinets. If the electric lift table continues to operate after contacting an obstacle, it may damage the obstacle or the electric lift table itself. Furthermore, the electric lift table may pinch the human body during the lifting process, causing injury to the user. Therefore, if the electric lift table encounters an obstacle during operation, it should stop immediately and reverse the direction for a certain distance.

[0042] Currently, IEC60335 has set higher requirements for the trigger force required for electric lift tables to retract when encountering resistance. Pressure detection technology provides a more direct way to detect external resistance. Electric lift tables experience complex forces when encountering obstacles, so the location of the pressure sensor is crucial. It's best to place the pressure sensor in a location directly exposed to external forces.

[0043] The utility model proposes an electric lifting column, which includes a telescopic sleeve assembly, a transmission assembly and a drive unit, wherein the transmission assembly is arranged in the telescopic sleeve assembly and drives the telescopic sleeve assembly to axially extend and retract, and the drive unit includes a drive motor and a reduction module that is transmission-connected to the drive motor, and the reduction module is also transmission-connected to the transmission assembly, thereby driving the telescopic sleeve assembly to axially extend and retract through the drive motor.

[0044] Generally, according to the number of telescopic tube sections of the telescopic tube assembly, the lifting column can be divided into a two-section lifting column, a three-section lifting column, and a lifting column with more than three sections; according to the nesting order of the telescopic tube assembly from top to bottom, the lifting column has a normal position and an inverted position; according to whether the driving motor is placed inside the telescopic tube assembly, the lifting column has an internal type and an external type; according to the quantitative relationship between the driving motor and the telescopic tube assembly (2), the electric lifting column can be divided into a dual-motor type, a single-motor type (one driving two), etc. When the types of electric lifting columns are different, the connection between the electric lifting column and the tabletop or the frame needs to be realized through different structures. Hereinafter, the present utility model provides several sets of embodiments to illustrate the specific installation positions of the sensors when the connection structures between the electric lifting column and the tabletop or the frame are different.

[0045] Embodiment 1

[0046] In this embodiment, as Figure 1 and Figure 2 shown, a normal-position three-section electric lifting column is provided. The telescopic tube assembly includes a first tube 15, an intermediate tube 16, and a second tube 17 which are nested. The transmission assembly 30 drives the first tube 15, the intermediate tube 16, and the second tube 17 to telescopically extend. As Figure 2 shown, a box body 11 is fixedly arranged at the end of the first tube 15, and the driving motor 14 is arranged inside the box body 11; when an inverted structure is adopted, the box body 11 is arranged at the end of the second driving tube 17. The structures of two-section and more than three-section telescopic tubes will not be elaborated here.

[0047] For this kind of electric lifting column with the box body 11 arranged, a frame 20 is installed at the bottom of the tabletop. The frame 20 is connected to the box body 11. The external force received by the tabletop will be conducted to the box body 11 through the frame 20, causing the box body 11 to deform. Therefore, the sensor can be arranged on the inner wall of the box body 11, and the function of retracting when encountering resistance has high sensitivity and reliability.

[0048] During the lifting process of the electric lifting table of the present utility model, once the tabletop receives an external force, the tabletop transmits the force to the electric lifting column through the frame 20. As Figure 6 shown, after the side wall 12 of the box body 11 of the electric lifting column is subjected to an external force at a position close to the installation part 12a, it deforms. When the sensor 13 arranged on the side wall 12 detects the deformation, it generates an electric signal and transmits the electric signal to the controller, and the controller judges whether to execute the instruction of retracting when encountering resistance.

[0049] In the present utility model, the sensor 13 is arranged on the side wall 12 where the electric lifting column is connected to the frame 20, which can directly detect the force exerted on the lifting column by the frame 20, with high detection accuracy, and breaks through the limitation of arranging the sensor 13 on the transmission component 30, expanding the detection position of the sensor 13. In addition, in addition to the vertical force, the electric lifting table is also subjected to a horizontal force. If the sensor 13 is arranged on the transmission component 30, it is difficult for the sensor 13 to sensitively detect the horizontal force. In the present utility model, the sensor 13 is arranged on the side wall 12. Since the side wall 12 is directly connected to the frame 20, the side wall 12 can be deformed after the frame 20 is subjected to a horizontal force. Therefore, the sensor 13 can directly detect the horizontal force.

[0050] Preferably, as Figure 1 and Figure 3 shown, in the present utility model, the mounting portion 12a can be a threaded hole or an outward convex bump, and the frame 20 is provided with a mating mounting hole or notch 20a. Whether it is screw installation or other quick installation methods, the mounting portion 12a is the key position for the direct transmission of external forces, and the deformation generated around the mounting portion 12a is the largest.

[0051] As Figure 6 shown, when the electric lifting column is subjected to an external load, the side wall 12 of the box body 11 of the electric lifting column deforms under the action of the external load, and there is obvious bending deformation near its mounting portion 12a. Therefore, the sensor 13 closely attached to the side wall 12 will also deform accordingly, which is the key for the technical solution of the present utility model to be implemented.

[0052] In order to increase the deformation amount around the mounting portion 12a, a through portion can be arranged around the mounting portion 12a. The through portion can weaken the local strength of the side wall 11, increase the deformation amount around the mounting portion 12a, and further improve the detection sensitivity of the sensor 13.

[0053] In practical applications, the thickness of the side wall 12 of the box body 11 has a great influence on the detection sensitivity of the sensor 13. The thinner the side wall 12, the easier it is to deform under the action of an external force, and the easier it is for the sensor 13 to detect the external force. The thicker the side wall 12, the more difficult it is to deform under the action of an external force, and the more difficult it is for the sensor 13 to detect the external force. In order to ensure that the electric lifting column can ensure a certain strength and meet the detection requirements of the sensor, the thickness of the side wall 12 should be 1.5 - 3.5 mm. More preferably, the side wall thickness is 2 mm.

[0054] To further improve the reliability of signal detection when the electric lifting column encounters an obstacle and retracts, multiple sensors 13 can be installed on the side wall 12. Preferably, two sensors 13 are installed, one on each of the opposite side walls 12. By using multiple sensors 13 to detect together, the reliability of the sensor 13 detection is improved and the probability of misjudgment is reduced.

[0055] It should be noted that the box body set at one end of the telescopic sleeve assembly is a type of electric lifting column. Regardless of the transmission assembly of any mechanism, the detection technology and accuracy requirements of the present utility model can be achieved through the installation relationship between the box body 11 and the sensor 13 described in Example 1.

[0056] Example 2

[0057] In this embodiment, the first sleeve 15 of the telescopic sleeve assembly is directly fixedly connected to the frame 20. For example, it can be screwed, snap-fitted, etc. The sensor 13 is mounted on the inner wall of the first sleeve 15 and as close to the frame 20 as possible.

[0058] Alternatively, as Figure 8 As shown, the drive motor 14 is mounted on the frame 20. A deceleration module is installed inside the telescopic sleeve assembly on the side near the frame 20. The drive motor 14 is connected to the deceleration module (not shown) via a transmission rod. The deceleration module configuration and transmission structure can be found in CN215347479U. A sensor 13 is installed on the inner wall of the first sleeve 15 on the same side as the deceleration module. When the frame 20 encounters an external force, the force is transmitted to the first sleeve 15. The sensor 13 installed on the inner wall of the first sleeve 15 generates an electrical signal under the influence of the force and transmits the electrical signal to the controller, realizing the retraction function when encountering resistance.

[0059] Example 3

[0060] Different from the method in which the lifting column is provided with the box body 11 at the end of the first sleeve 15 of the telescopic sleeve assembly in the first embodiment, in this embodiment, Figure 9 As shown, the driving motor, reduction module, and transmission assembly of the lifting column are axially arranged and all built into the first sleeve 15. A lifting column of this structure is generally mounted to the frame 20 or desktop via a mounting plate 18 fixedly connected to the end of the first sleeve 15. Therefore, the first sleeve 15 will also deform under the influence of external forces. Optionally, in this embodiment, a sensor 13 is mounted on the first sleeve 15, and the sensor 13 is as close to the mounting plate 18 as possible. In this case, the sensor 13 can be mounted on the inner wall of the first sleeve 15, in which case the sensor 13 can detect the deformation of the first sleeve 15. The sensor 13 provided on the first sleeve 15 generates an electrical signal under the influence of an external force and transmits the electrical signal to the controller, thereby realizing the function of retreating when encountering resistance.

[0061] For the technical solutions disclosed in the first embodiment, the second embodiment, and the third embodiment, the sensor 13 has no direct association with the transmission assembly 30 and is not interfered by the internal force changes of the transmission assembly 30. It can directly detect the influence of external forces on the electric lifting column. At this time, the detection part of the sensor 13 is closer to the desktop, the detection effect is better, and the application range is wider.

[0062] In addition, for the transmission assembly, in an alternative embodiment, a connecting member 31 capable of performing a rotary motion is provided on the bottom plate of the box body 11. The connecting member 31 drives the connecting pipe 32 to rotate, the connecting pipe 32 drives the hollow lead screw 33 to rotate, a hollow lead screw nut 35 fixedly connected to the other end of the first sleeve is sleeved on the hollow lead screw 33, a solid lead screw nut 36 is fixedly connected to the end of the hollow lead screw 33, the solid lead screw nut 36 can rotate around the axis and is clamped in a groove fixed to the intermediate sleeve 16, and a solid lead screw 34 is also sleeved on the solid lead screw nut 36. The solid lead screw 34 is fixedly connected to the bottom end of the second sleeve 17. When the connecting member 31 rotates, it can drive the intermediate sleeve 16 and the second sleeve 17 to expand and contract synchronously.

[0063] The connecting member 31 and the connecting pipe 32 of the present lifting column only transmit the torque of the driving motor 14 and do not bear axial forces. If the sensor 13 is provided on the transmission assembly 30, the sensor 13 can hardly detect external forces. Therefore, the detection effect of arranging the sensor 13 in the box body 11 or the telescopic sleeve assembly is particularly better than arranging the sensor 13 on the transmission assembly 30.

[0064] It is worth noting that the electric lifting column body can be Figure 2 the structure in Figure 2 but is not limited to

[0065] the structure in The advantage of the present utility model is that it breaks through the restriction of arranging the sensor 13 on the transmission assembly 30 and extends the arrangement position of the sensor 13 to the inner wall of the lifting column box body 11. Among them, the detection effect of arranging the sensor 13 on the side wall 12 is better than arranging it on the bottom plate of the box body 11.

[0065] In addition, the sensor of the present utility model is a strain gauge or a piezoelectric element, and the piezoelectric element is further divided into categories such as quartz piezoelectric elements and ceramic piezoelectric elements.

[0066] A strain gauge is an element used to measure strain. When the strain gauge undergoes mechanical deformation under the action of an external force, its resistance value will change accordingly. By measuring the change in the resistance value, the strain and stress of an object can be calculated, thereby realizing the measurement of the force deformation of the object. Strain gauges are commonly used in various types of sensors such as pressure sensors, load cells, and torque sensors.

[0067] The ceramic piezoelectric element utilizes the piezoelectric effect of piezoelectric ceramics. Under the action of an external force, the centers of positive and negative charges inside the piezoelectric ceramics will undergo relative displacement, resulting in bound charges with opposite signs appearing at both ends of the piezoelectric ceramics, thereby generating a voltage. By detecting the voltage, it can be determined whether the ceramic piezoelectric element is subjected to an external force.

[0068] According to the test, after the ceramic piezoelectric element is subjected to a sudden change in external load, there is an obvious change in the electrical signal. By analyzing the electrical signal, it can be determined whether to perform obstacle avoidance and retraction. As Figure 6 shown, when the lifting column is subjected to an external alternating force, the electrical signal output by the ceramic piezoelectric element has an obvious change. The controller collects and processes the electrical signal to further determine whether the change in the electrical signal is caused by an external force.

[0069] Considering cost and feasibility, the sensor 13 is preferably a ceramic piezoelectric element. The ceramic piezoelectric element is tightly attached to the side wall 12 by means of adhesion. When the side wall 12 drives the ceramic piezoelectric element to deform under the influence of a force, an electrical signal is generated.

[0070] Preferably, the shape of the sensor 13 can be circular, strip-shaped, annular or C-shaped. As Figure 4 shown is a C-shaped ceramic piezoelectric element, as Figure 5 shown is a strip-shaped ceramic piezoelectric element. The ceramic piezoelectric element includes a metal plate 13b, a piezoelectric ceramic plate 13a, and a wire 13c. When the ceramic piezoelectric element is deformed by a force, a transfer of bound charges occurs in the piezoelectric ceramic plate 13a, causing a voltage difference between the metal plate 13b and the piezoelectric ceramic plate 13a, and transmitting the electrical signal to the controller through the wire 13c.

[0071] When the sensor 13 is rectangular or strip-shaped, the rectangular or strip-shaped sensor can be pasted on the side wall 12 of the box body 11 or on the inner wall of the sleeve. It should be noted that the fixing method of the sensor 13 is not limited to pasting, and other installation methods in the prior art that do not affect the detection deformation function of the sensor 13 are acceptable. As an optional implementation, after the rectangular or strip-shaped sensor 13 is installed, the angle between it and the vertical direction is 15 to 75 degrees. For example, it can be 15 degrees, or 26 degrees, or 53 degrees, or 75 degrees, etc. That is, at this time, the rectangular or strip-shaped sensor 13 is installed obliquely, that is, the sensor 13 is not installed vertically or horizontally. Since the deformation of the side wall 12 or the inner wall of the sleeve is not regular, the obliquely installed sensor 13 can be applicable to more complex deformations and has higher detection sensitivity.

[0072] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present utility model. It should be understood that the above description is only for the specific embodiments of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An electric lifting column, comprising a telescopic sleeve assembly, a transmission assembly and a drive unit. The transmission assembly is arranged inside the telescopic sleeve assembly and drives the telescopic sleeve assembly to axially expand and contract. The telescopic sleeve assembly at least comprises a first sleeve and a second sleeve. The drive unit comprises a drive motor and a reduction module, and is characterized in that: A box body is fixedly arranged at the end of the first sleeve or the second sleeve. The driving motor is arranged inside the box body, and at least one sensor for detecting the deformation of the inner wall of the box body is arranged on the inner wall of the box body; or the driving motor is arranged inside the telescopic sleeve assembly, and at least one sensor for detecting the deformation of the inner wall of the sleeve is arranged on the inner wall of the sleeve on the same side as the driving motor; or the speed reduction module is arranged inside the telescopic sleeve assembly, and at least one sensor for detecting the deformation of the inner wall of the sleeve is arranged on the inner wall of the sleeve on the same side as the speed reduction module.

2. The electric lifting column according to claim 1, wherein: An installation part is arranged on the inner wall of the box body or the inner wall of the telescopic sleeve assembly; the sensor is arranged on the installation part or at a position adjacent to the installation part.

3. The electric lifting column according to claim 2, wherein: The installation part is an installation hole or an installation boss arranged on the inner wall of the box body, or the installation part is an end plate arranged on the telescopic sleeve assembly or an installation hole on the inner wall of the telescopic sleeve assembly.

4. The electric lifting column according to any one of claims 1 to 3, characterized in that: The inner wall of the box body includes a side wall and a bottom plate, and the sensor is arranged on the side wall.

5. The electric lifting column according to claim 4, wherein: The side wall is provided with a plurality of through parts for increasing the amount of deformation of the side wall.

6. The electric lifting column according to claim 4, wherein: The thickness of the side wall is 1.5 - 3.5 mm.

7. The electric lifting column according to claim 4, characterized in that: The number of the sensors is 2, and the sensors are arranged on opposite side walls.

8. The electric lifting column according to claim 4, wherein: The sensor is circular or rectangular or annular or C-shaped or strip-shaped.

9. The electric lifting column according to claim 8, wherein: The rectangular or strip-shaped sensor is pasted on the side wall of the box body, and the included angle with the vertical direction of the box body is 15 - 75 degrees.

10. The electric lifting column according to claim 8, wherein: The rectangular or strip-shaped sensor is pasted on the inner wall of the telescopic sleeve assembly, and the included angle with the vertical direction is 15 - 75 degrees.

11. The electric lifting column according to claim 1, wherein: The sensor is a strain gauge or a ceramic piezoelectric element or a quartz piezoelectric element.

12. The electric lifting column according to claim 1, wherein: The driving motor is located inside or outside the telescopic sleeve assembly. The speed reduction module is arranged inside the telescopic sleeve assembly. The driving motor is in transmission connection with the speed reduction module, and the speed reduction module is in transmission connection with the transmission assembly.

13. The electric lifting column according to claim 1, wherein: The telescopic sleeve assembly is a second sleeve, an intermediate sleeve and a first sleeve nestedly arranged. The box body is fixedly arranged at the end of the first sleeve. The first sleeve is provided with a connecting piece for rotary motion. The connecting piece drives the connecting pipe to rotate. The connecting pipe drives the hollow lead screw to rotate. A hollow lead screw nut fixedly connected to the other end of the first sleeve is sleeved on the hollow lead screw. The end of the hollow lead screw is fixedly connected with a solid lead screw nut. The solid lead screw nut is rotatably clamped on the intermediate sleeve. The solid lead screw nut is also sleeved with a solid lead screw. The solid lead screw is fixedly connected to the bottom end of the second sleeve.

Images