Lift table based on obstruction detection mechanism

Abstract

The present application relates to resistance detection mechanism technical field, specifically to a kind of resistance detection mechanism for lifting component, including detection piece and the telescopic assembly being coaxially arranged with lead screw, the telescopic assembly includes circumferentially opposite positioning and axially relatively telescopic positioning piece and movable piece;The positioning piece is used to interface with motor, and the movable piece is used to interface with lead screw;Elastic member is arranged between positioning piece and movable piece for applying elastic force towards movable piece towards lead screw;Guiding assembly is arranged between movable piece and lead screw, the guiding assembly is configured as guiding lead screw same direction rotation when movable piece rotates, and guiding movable piece contraction when telescopic stand rises and meets resistance;The detection piece is located between positioning piece and movable piece, when movable piece is contracted to abut and press with detection piece, detection piece generates a pressure signal;The present application directly takes lead screw as detection object, so whether table board is blocked or lifting component itself meets resistance, resistance detection can be realized.

Description

[0001] Cross-reference to related applications

[0002] This application is a divisional application based on application number 2023110179182, filed on August 14, 2023, entitled "An Obstacle Detection Mechanism for Lifting Components". Technical Field

[0003] This invention relates to the field of resistance detection mechanism technology, and specifically to a lifting table based on a resistance detection mechanism. Background Technology

[0004] Lifting components, also known as telescopic components, are components that can achieve linear extension and retraction. They have a wide range of applications in many fields. For example, in height-adjustable desks, lifting components are generally used as telescopic legs to control the height adjustment of the desk's tabletop.

[0005] Currently, most lifting components use a screw drive to achieve lifting. These components mainly consist of a telescopic column and a screw. In use, a motor drives the screw to rotate, and the screw rotates itself to drive the telescopic column to achieve axial extension and retraction.

[0006] With the development of technology, some lifting components are equipped with obstruction detection mechanisms. These mechanisms are mainly used to send out detection signals when the lifting component encounters an obstacle during its ascent. The controller uses these signals to stop the motor or drive the lifting component to retract.

[0007] In related technologies, the obstruction detection mechanism on the lifting component mainly uses pressure sensors or strain gauges to generate detection signals. Taking a lifting table as an example, strain gauges and sensors (such as pressure sensors) are generally installed between the telescopic column and the table. When the table encounters obstruction, the table will exert pressure on the sensor or strain gauge, causing the sensor to generate a pressure signal or the strain gauge to deform under force and generate a deformation signal. This pressure signal or deformation signal serves as the detection signal. For details on this obstruction detection mechanism, please refer to the patent documents with publication numbers CN217586111U and CN214283819U.

[0008] However, the aforementioned obstacle detection mechanism still has shortcomings in practical use, mainly in two aspects: Firstly, the detection mechanism mainly generates a detection signal when the tabletop is obstructed. However, in reality, the lifting components may sometimes be obstructed due to their own reasons. For example, there may be debris in the gap between the inner and outer sleeves of the telescopic column, preventing them from sliding and extending relative to each other, or the lead screw may be obstructed from rotating. Obviously, when the obstruction is caused by the lifting components themselves, the aforementioned obstruction detection mechanism cannot generate a detection signal.

[0009] Secondly, the aforementioned testing components are generally installed directly between the table and the telescopic column. The testing components are always under load, mainly due to the pressure formed by the weight of the table. This is not conducive to the service life of the testing components, especially the strain gauges, which are easily fatigued and damaged due to long-term heavy load. Summary of the Invention

[0010] In order to solve at least one of the technical problems mentioned in the background art, the object of the present invention is to provide an obstruction detection mechanism for a lifting component.

[0011] To achieve the above objectives, the present invention provides the following technical solution: An obstruction detection mechanism for a lifting component includes a lead screw, a motor, and a telescopic column. The motor drives the lead screw to rotate, causing the telescopic column to rise and fall. The obstruction detection mechanism includes a detection element and a telescopic assembly coaxially arranged with the lead screw. The telescopic assembly includes a positioning element and a movable element that are circumferentially positioned relative to each other and axially retractable relative to each other. The positioning element is used to dock with the motor, and the movable element is used to dock with the lead screw. An elastic element is provided between the positioning element and the movable element to apply a spring force toward the lead screw to the movable element. A guide assembly is provided between the movable element and the lead screw. The guide assembly is configured to guide the lead screw to rotate in the same direction when the movable element rotates, and to guide the movable element to retract when the telescopic column encounters obstruction during ascent. The detection element is located between the positioning element and the movable element. When the movable element retracts to press against the detection element, the detection element generates a pressure signal.

[0012] Compared with existing technologies, the advantages of this solution are: In this solution, a telescopic assembly is used to drive the lead screw and motor. A guide assembly is also provided, and a detection component is placed between the movable and positioning parts of the telescopic assembly. When the lifting component is in a state where it can extend and retract normally (i.e., the lifting component is not obstructed and the lead screw can rotate normally), the motor drives the positioning and movable parts to rotate synchronously in the circumferential direction. In this way, the movable part guides the lead screw to rotate in the same direction under the action of the guide assembly, thus achieving the purpose of driving the lead screw to rotate and drive the telescopic column to rise and fall.

[0013] When the lifting component encounters resistance during ascent, such as when the table connected to the telescopic column encounters resistance or when the telescopic column itself encounters resistance preventing it from rising normally, the lead screw will be stuck and unable to rotate. In this state, it is equivalent to the motor still being in operation while the lead screw is stopped. In this state, the motor will drive the positioning component and the moving component to continue rotating. During the rotation of the moving component, guided by the guide component, the moving component will overcome the elastic force of the elastic component and contract relative to the positioning component. During the contraction process, the moving component will eventually press against the detection component. After being pressed, the detection component will generate a pressure signal as a detection signal, thereby achieving the purpose of resistance detection.

[0014] Therefore, compared with the existing method of using the tabletop as the detection object, this solution can directly use the lead screw as the detection object. In this way, whether the tabletop is obstructed or the lifting component itself is obstructed, detection can be achieved. This is because whether the tabletop is obstructed or the lifting component itself is obstructed, the lifting component will not be able to rise, which will cause the lead screw to not rotate. Thus, by using the lead screw as the detection object, comprehensive obstruction detection can be achieved.

[0015] It is worth noting that when the lead screw is rotating normally, under the elastic force of the elastic element, the moving part is in an extended or protruding state relative to the positioning part. In this state, the positioning part is always separated from the detection part, so the detection part is in a state of no force. In other words, when the lead screw can rotate normally (i.e., the lifting part can lift and lower normally), the detection part will not be subjected to the pressure of the moving part, thus keeping the detection part in a state of no force, which is beneficial to the service life of the detection part.

[0016] Preferably, the guide assembly includes a protrusion and an inclined guide groove, the protrusion being movably disposed in the guide groove; one of the protrusion and the guide groove is disposed on the movable part, and the other is disposed on the lead screw.

[0017] Preferably, the movable part includes a circular insertion hole, and the mating end of the lead screw is rotatably inserted into the insertion hole; the guide groove is provided on the movable part and is inclined around the peripheral wall of the insertion hole; the protrusion is fixed on the outer peripheral wall of the lead screw.

[0018] Preferably, a limiting structure is provided between the positioning member and the movable member, so that the positioning member and the movable member are relatively positioned in the circumferential direction and can be relatively extended and retracted in the axial direction under the limiting structure.

[0019] Preferably, the limiting structure includes a limiting post with a polygonal cross-section and a slot adapted to the limiting post; the limiting post is inserted into the slot and is axially movable relative to the slot; the slot is axially opened on the positioning member, and the limiting post is axially fixed at the end of the movable member away from the lead screw.

[0020] Preferably, the elastic element includes a spring, which is disposed in the slot, with one end of the spring abutting against the end wall of the slot and the other end abutting against the end of the limiting post.

[0021] Preferably, the detection element is disposed on the end wall of the positioning element facing the movable element; or, the detection element is disposed on the end wall of the movable element facing the positioning element.

[0022] Preferably, the detection component is mounted on a positioning plate, which is fixed on a carrier that moves synchronously with the lifting column; and the positioning plate is at least partially spaced above the movable component to form an installation area, where the detection component is fixed.

[0023] Preferably, the positioning plate extends radially outward to form at least one support arm, which is used to fix it to the carrier.

[0024] Preferably, the detection element is a pressure sensor or a strain gauge.

[0025] Other advantages and effects of the present invention will be specifically explained in the detailed description and accompanying drawings. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the height-adjustable table of the present invention; Figure 2 for Figure 1 Internal diagram of the location of the central motor box; Figure 3 This is a schematic diagram of the obstacle detection mechanism of the present invention; Figure 4 This is an exploded view of the obstacle detection mechanism of the present invention; Figure 5 This is a schematic diagram showing the state switching of the obstruction detection mechanism when the lifting component encounters an obstacle. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0028] In the following description, terms such as “inner,” “outer,” “upper,” “lower,” “left,” and “right” that indicate orientation or positional relationship are used only for the convenience of describing the embodiments and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0029] Example 1 Please see Figures 1-5 As shown, this embodiment provides an obstruction detection mechanism for a lifting component, wherein, as Figure 1 As shown, the lifting component can be the telescopic legs of a height-adjustable table, combined with... Figure 1 and Figure 2 As shown, the lifting component includes a lead screw 12, a motor 13, and a telescopic column 11. The motor 13 drives the lead screw 12 to rotate, thereby causing the telescopic column 11 to rise and fall axially. For ease of explanation, this embodiment takes the vertical lifting of the telescopic column 11 as an example of axial lifting for specific explanation.

[0030] Combination Figure 3 and Figure 4 As shown, the obstruction detection mechanism includes a detection element 2 and a telescopic assembly coaxially arranged with the lead screw 12. The telescopic assembly includes a positioning element 31 and a movable element 32 that are circumferentially positioned relative to each other and axially telescopic. In other words, the movable element 32 can telescopically extend and retract relative to the positioning element 31 in the axial direction, but the two remain relatively stationary in the circumferential direction. That is, the rotation of the positioning element 31 drives the movable element 32 to rotate synchronously. It is worth noting that in this embodiment, as... Figure 2 As shown, the positioning component 31, the moving component 32, and the lead screw 12 are in a coaxial state, that is, all three rotate around the axis of the lead screw 12.

[0031] The positioning component 31 is used to dock with the motor 13, and the motor 13 drives the positioning component 31 to rotate circumferentially. The movable component 32 is used to dock with the lead screw 12, and in the docked state, the movable component 32 and the lead screw 12 can move relative to each other.

[0032] An elastic element is provided between the positioning element 31 and the movable element 32 to apply a spring force toward the lead screw 12 to the movable element 32; Figure 2 From the perspective shown, it can be considered that the elastic member applies a downward elastic force to the movable member 32 to push the movable member 32 to maintain an extended tendency (i.e., a downward tendency) relative to the positioning member 31.

[0033] like Figure 3 and Figure 4 As shown, a guide assembly is provided between the movable part 32 and the lead screw 12. The guide assembly is configured to guide the lead screw 12 to rotate in the same direction when the movable part 32 rotates, and to guide the movable part 32 to retract when the telescopic column 11 encounters resistance during its ascent. That is, when the lifting component can lift and lower normally, it mainly relies on the guide assembly as a transmission component. The motor 13 drives the positioning part 31 and the movable part 32 to rotate, and then the movable part 32 drives the lead screw 12 to rotate through the guide assembly to realize the lifting and lowering of the telescopic column 11.

[0034] When the telescopic column 11 encounters resistance during its ascent, it is restricted from rising by the obstruction. As a result, the lead screw 12 is stuck and cannot rotate. If the movable part 32 continues to rotate, it will act on the guide component, causing the guide component to guide the movable part 32 to continuously retract relative to the positioning part 31 (i.e., the movable part 32 continuously rises).

[0035] like Figure 5 As shown, the detection element 2 is located between the positioning element 31 and the movable element 32. When the movable element 32 retracts to press against the detection element 2 (see reference...), Figure 5 (As shown in section b), the detection element 2 generates a pressure signal, which is equivalent to a detection signal. In order to cooperate with the use of the obstruction detection mechanism, when the controller of the lifting component receives the pressure signal, the controller controls the motor 13 to stop. Of course, the controller can also control the motor 13 to reverse according to the pressure signal, so as to drive the lifting component to descend.

[0036] Thus, when the lifting component is in a state where it can extend and retract normally (i.e., the lifting component is not obstructed and the lead screw 12 can rotate normally), the motor 13 drives the positioning component 31 and the movable component 32 to rotate synchronously in the circumferential direction. In this way, the movable component 32 will guide the lead screw 12 to rotate in the same direction under the action of the guide component, thus achieving the purpose of driving the lead screw 12 to rotate and drive the telescopic column 11 to rise and fall.

[0037] When the lifting component encounters resistance during ascent, such as when the tabletop 5 connected to the telescopic column 11 encounters resistance during ascent, or when the telescopic column 11 itself encounters resistance preventing it from rising normally, the lead screw 12 will be stuck and unable to rotate. At this time, it is equivalent to the motor 13 still being in operation, while the lead screw 12 is in a stopped state. In this state, the motor 13 will drive the positioning component 31 and the movable component 32 to continue rotating. During the rotation, the movable component 32 is guided by the guide component and will overcome the elastic force of the elastic component to contract relative to the positioning component 31. During the contraction process, the movable component 32 will eventually press against the detection component 2. After being pressed, the detection component 2 will generate a pressure signal as a detection signal, thereby achieving the purpose of resistance detection.

[0038] Therefore, compared with the existing method of using the tabletop 5 as the detection object, this embodiment can directly use the lead screw 12 as the detection object. In this way, whether the tabletop 5 is obstructed or the lifting component itself is obstructed, detection can be achieved. This is because whether the tabletop 5 is obstructed or the lifting component itself is obstructed, the lifting component will not be able to rise, which will cause the lead screw 12 to not rotate. Thus, by using the lead screw 12 as the detection object, all-round obstruction detection can be achieved.

[0039] It is worth noting that when the lead screw 12 is rotating normally, under the elastic force of the elastic element, the moving part 32 is in an extended or protruding state relative to the positioning part 31 (see reference). Figure 5 (As shown in part a), in this state, the positioning member 31 is always separated from the detection member 2, so the detection member 2 is in a state of no force. In other words, when the lead screw 12 can rotate normally (i.e., the lifting component can lift normally), the detection member 2 will not be subjected to the pressure of the moving part 32, thus making the detection member 2 in a state of no force, which is beneficial to the service life of the detection member 2.

[0040] The specific structure of the boot component in this embodiment is as follows: like Figure 3 and Figure 4 As shown, the guide assembly includes a protruding post 121 and an inclined guide groove 321, wherein the protruding post 121 is movably disposed in the guide groove 321; one of the protruding post 121 and the guide groove 321 is disposed on the movable part 32, and the other is disposed on the lead screw 12.

[0041] For ease of understanding, such as Figure 4 As shown, in this embodiment, the protrusion 121 is provided on the lead screw 12 and the guide groove 321 is provided on the movable part 32 as an example for specific explanation: The movable component 32 has a cylindrical structure with a circular insertion hole 323 in its center, making the movable component 32 a cylindrical sleeve structure with a closed top. The mating end of the lead screw 12 (e.g., the upper end of the lead screw 12) is rotatably inserted into the insertion hole 323. The mating end of the lead screw 12 has a cylindrical structure, so that the movable component 32 can rotate circumferentially and move axially at the mating end of the lead screw 12.

[0042] The guide groove 321 is provided on the movable part 32 and is inclined around the peripheral wall of the insertion hole 323. For example, in this embodiment, the guide groove 321 penetrates the outer peripheral wall of the movable part 32; the protrusion 121 is fixed on the outer peripheral wall of the lead screw 12.

[0043] like Figure 5 As shown, in this embodiment, for ease of explanation, the positioning member 31 is rotated counterclockwise (e.g., Figure 5 The direction indicated by the arrow in the middle R section is used as the direction to drive the telescopic column 11 to rise. That is, the screw 12 rotates counterclockwise to make the telescopic column 11 rise, and rotates clockwise to make the telescopic column 11 fall.

[0044] like Figure 5As shown, when the lifting component encounters resistance, causing the lead screw 12 to jam and unable to rotate, the lead screw 12 remains stationary, while the motor 13 continues to drive the positioning component 31 to rotate counterclockwise. This, in turn, causes the positioning component 31 to drive the movable component 32 to rotate counterclockwise, while the protrusion 121 remains stationary with the lead screw 12. Thus, the protrusion 121 generates a thrust F directed upwards and to the left on the upper inclined wall of the guide groove 321. This thrust decomposes into an upward thrust F1 and a leftward thrust F2. When the thrust F1 is greater than the downward force of the spring 33, the movable component 32 is pushed upwards under the action of the thrust F1, causing the movable component 32 to continuously approach the detection component 2 and eventually press against it, as shown in the diagram. Figure 5 The state shown in section b is used to generate a pressure signal for the detection element 2.

[0045] When there is no obstruction and the lead screw 12 is in a state where it can rotate normally, as the positioning member 31 rotates counterclockwise, the upper inclined wall of the guide groove 321 on the movable member 32 will generate a force on the protrusion 121 that is opposite to the thrust F. This force will decompose into a driving force that is opposite to the thrust F2 (i.e., to the right). Under the action of this driving force, the protrusion 121 and the lead screw 12 will rotate counterclockwise, thereby realizing the rise of the telescopic column 11.

[0046] Understandably, in order to ensure that the lead screw 12 is in a normal rotating state and that the protrusion 121 does not push the movable part 32 against the detection part 2, the spring 33 is designed so that its elastic force is sufficient to overcome the thrust F1 of the movable part 32 under the normal rotating state of the lead screw 12, so that the movable part 32 is not lifted or is not lifted to the point of being against the detection part 2 under the normal rotating state of the lead screw 12.

[0047] In order to enable the positioning member 31 and the movable member 32 to maintain relative axial movement and relative circumferential positioning, in this embodiment, a limiting structure is provided between the positioning member 31 and the movable member 32. Under the limitation of the limiting structure, the positioning member 31 and the movable member 32 maintain relative positioning in the circumferential direction and can extend and retract relative to each other in the axial direction.

[0048] Specifically, such as Figure 4 As shown, the limiting structure includes a limiting post 322 with a polygonal cross-section and a slot 311 adapted to the limiting post 322. For example, in this embodiment, the limiting post 322 is a rectangular column, and the slot 311 is a rectangular groove adapted to the rectangular column.

[0049] The slot 311 is axially formed on the positioning member 31, and the limiting post 322 is axially fixed at the end of the movable member 32 away from the lead screw 12.

[0050] When the limiting post 322 is inserted into the slot 311, the limiting post 322 cannot rotate circumferentially relative to the positioning member 31 under the restriction of the slot 311, thus preventing the movable member 32 from rotating circumferentially relative to the positioning member 31.

[0051] In addition, the limiting post 322 can move axially in the slot 311, so as to ensure that the movable part 32 can extend and retract axially relative to the positioning part 31.

[0052] like Figure 5 As shown, the elastic element is preferably a spring 33, which is disposed in the slot 311. One end of the spring 33 abuts against the end wall of the slot 311, and the other end abuts against the end of the limiting post 322. Thus, the spring 33 generates a downward elastic force on the limiting post 322, and in turn generates a downward elastic force on the movable element 32.

[0053] In this embodiment, the detection element 2 can be a strain gauge or a pressure sensor, and the detection element 2 is fixed on the end wall of the positioning element 31 facing the movable element 32; of course, the detection element 2 can also be disposed on the end wall of the movable element 32 facing the positioning element 31.

[0054] Although both of the above-mentioned installation positions of the detection element 2 can generate pressure signals, since they are installed on the positioning element 31 or the movable element 32, and the positioning element 31 and the movable element 32 often need to rotate, the detection element 2 will also rotate. This places high demands on the wiring of the detection element 2. Therefore, this embodiment provides another installation structure for the detection element 2: like Figures 2-4 As shown, the detection component 2 is installed on a positioning plate 21, which is fixed on a carrier that moves synchronously with the lifting column. The positioning plate 21 is at least partially spaced above the movable component 32 to form an installation area, and the detection component 2 is fixed in the installation area.

[0055] For example, such as Figure 3 and Figure 4 As shown, the positioning plate 21 has a ring-shaped structure, and its inner ring is movably sleeved around the periphery of the limiting post 322. The limiting post 322 can rotate circumferentially and move axially within the inner ring of the positioning plate 21. Using the motor box 4 at the top of the lifting column as a carrier, the positioning plate 21 is fixed in the motor box 4 and is a certain distance away from the top of the movable part 32.

[0056] To facilitate the installation of the positioning plate 21, the positioning plate 21 extends radially outward to form at least one support arm 211, which is used to fix it to the carrier.

[0057] Example 2 Combination Figures 1-5As shown, this embodiment provides a height-adjustable table based on embodiment 1. It includes a tabletop 5, telescopic table legs located at the bottom of the tabletop 5, and the obstacle detection mechanism provided in embodiment 1. The telescopic table legs adopt a lifting component, which includes a telescopic column 11, a lead screw 12, a motor 13, and a motor box 4. The motor 13 is used to drive the lead screw 12 to rotate, thereby driving the telescopic column 11 to rise and fall.

[0058] like Figure 1 As shown, the telescopic column 11 includes an outer sleeve 112, an inner sleeve 111, and a central tube 15; the inner sleeve 111 is axially movably sleeved through the outer sleeve 112, and the central tube 15 is inserted at the center of the outer sleeve 112 with its lower end fixed to the outer sleeve 112; a nut 14 is fixed to the top of the central tube 15, and a lead screw 12 is vertically movably inserted through the central tube 15 and threadedly engaged with the nut 14; the motor box 4 is fixed to the top of the inner sleeve 111, and the table 5 is fixed to the top of the motor box 4; the motor 13 is fixed in the motor box 4, and the obstruction detection mechanism is located in the motor box 4; the lead screw 12 is rotatably connected to the motor box 4, and its upper end extends into the motor box 4 and is connected to the obstruction detection mechanism.

[0059] In this way, the motor 13 drives the lead screw 12 to rotate through the obstacle detection mechanism, and then the lead screw 12 moves vertically in the central tube 15, thereby driving the inner sleeve 111 to move vertically together to realize the vertical lifting of the lifting component.

[0060] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A height-adjustable table based on an obstacle detection mechanism, comprising a tabletop and telescopic legs disposed at the bottom of the tabletop, wherein the telescopic legs employ a lifting component, the lifting component comprising a lead screw, a telescopic column, and a motor, the motor driving the lead screw to rotate and thereby causing the telescopic column to rise and fall, characterized in that... The obstruction detection mechanism includes a detection element and a telescopic assembly coaxially arranged with the lead screw. The telescopic assembly includes a positioning element and a movable element that are circumferentially positioned relative to each other and axially retractable relative to each other. The positioning element is used to connect with the motor, and the movable element is used to connect with the lead screw. An elastic element is provided between the positioning element and the movable element to apply a spring force toward the lead screw to the movable element. A guide assembly is provided between the movable element and the lead screw. The guide assembly is configured to guide the lead screw to rotate in the same direction when the movable element rotates, and to guide the movable element to retract when the telescopic column encounters obstruction during ascent. The detection element is located between the positioning element and the movable element. When the movable element retracts to press against the detection element, the detection element generates a pressure signal. The guide assembly includes a protruding post and an inclined guide groove, wherein the protruding post is movably disposed in the guide groove; one of the protruding post and the guide groove is disposed in the movable part, and the other is disposed in the lead screw; The movable component includes a circular insertion hole, and the mating end of the lead screw is rotatably inserted into the insertion hole; the guide groove is provided on the movable component and is inclined around the peripheral wall of the insertion hole; the protrusion is fixed on the outer peripheral wall of the lead screw. A limiting structure is provided between the positioning component and the movable component. Under the limitation of the limiting structure, the positioning component and the movable component are kept relatively positioned in the circumferential direction and can be relatively extended and retracted in the axial direction. The limiting structure includes a limiting post with a polygonal cross-section and a slot adapted to the limiting post; the limiting post is inserted into the slot and is axially movable relative to the slot; the slot is axially opened on the positioning member, and the limiting post is axially fixed at the end of the movable member away from the lead screw. The elastic element includes a spring, which is disposed in the slot. One end of the spring abuts against the end wall of the slot, and the other end abuts against the end of the limiting post.

2. The lifting table based on an obstacle detection mechanism according to claim 1, characterized in that, The lifting table also includes a motor box, and the tabletop is fixed to the top of the motor box; the telescopic column includes an outer sleeve, an inner sleeve, and a central tube; a nut is fixed to the top of the central tube, and a lead screw is vertically movably inserted through the central tube and threadedly engaged with the nut; the motor box is fixed to the top of the inner sleeve; the lead screw is rotatably connected to the motor box and its upper end extends into the motor box and is connected to the obstruction detection mechanism.

3. A height-adjustable table based on an obstacle detection mechanism according to claim 1, characterized in that, The detection element is disposed on the end wall of the positioning element facing the movable element; or, the detection element is disposed on the end wall of the movable element facing the positioning element.

4. A lifting table based on an obstacle detection mechanism according to claim 1, characterized in that, The detection component is mounted on a positioning plate, which is fixed on a carrier that moves synchronously with the lifting column; and the positioning plate is at least partially spaced above the movable component to form an installation area, where the detection component is fixed.

5. A lifting table based on an obstacle detection mechanism according to claim 4, characterized in that, The positioning plate extends radially outward to form at least one support arm, which is used to fix it to the carrier.

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