A lifting table capable of retreating when encountering obstacles

Abstract

The present application provides a lifting table that retracts when encountering resistance, and relates to the field of resistance detection technology. It includes a table top and several lifting legs; the lifting legs include: an outer sleeve, an inner sleeve, a first connecting member, a sliding channel, an elastic component is arranged in the sliding channel, and an airbag component that drives the elastic component to fully accommodate or partially extend out of the sliding channel; a second connecting member, slidingly matched with the first connecting member; a third connecting member, a first guide component is arranged between the third connecting member and the second connecting member for guiding the two to move away from each other when encountering resistance when ascending, and a second guide component is arranged between the third connecting member and the screw for guiding the two to move away from each other when encountering resistance when descending; a distance measuring component is arranged in one of the several lifting legs to detect the relative distance between the first connecting member and the second connecting member in the lifting leg. The present application can ensure that the first connecting member and the second connecting member will not vibrate in the axial direction and simultaneously realize resistance detection and retraction when ascending and descending.

Description

Technical Field

[0001] The present application relates to the technical field of resistance detection, and in particular to a lifting table that retracts when encountering resistance. Background Art

[0002] Electric tables with lifting functions can adjust their height according to people's needs to meet different usage requirements. During the lifting process, if it touches an obstacle, its movement will be blocked, but the lifting column will remain in working state and continue to provide the power required for the lifting movement of the table board, resulting in the continuous increase of the force between the table board and the obstacle, causing damage to the table board and the obstacle, and even crushing injuries to the human body. For this purpose, it is usually necessary to set up an obstruction detection system to detect whether an obstacle is encountered during operation. For example, the Chinese invention patent application with publication number CN 116754118 B discloses an obstruction detection mechanism for a lifting component. When the lifting component encounters an obstacle, the detection component generates a pressure signal, thereby achieving the purpose of obstruction detection.

[0003] However, the above solution still has the following defects: 1. The detection mode is single, which can only detect the resistance during the ascending process, but cannot detect the resistance during the descending process; 2. The structure is unstable. The first connecting member and the movable member are connected via a spring, which causes the outer sleeve to vibrate under the action of a downward external force. Summary of the invention

[0004] The present application provides a lifting table that can retract when encountering obstacles, so as to at least solve the above technical problems existing in the prior art.

[0005] According to a first aspect of the present application, there is provided a lifting table capable of retreating when encountering an obstacle, comprising a table top and a plurality of lifting legs arranged at the bottom of the table top; the lifting legs comprising: An outer sleeve, inside of which a driving motor and a screw are arranged; An inner sleeve, axially movably sleeved in the outer sleeve, wherein a nut block matching with the screw thread is arranged in the inner sleeve; a first connecting member connected to the output shaft of the driving motor, wherein a sliding channel is axially arranged in the first connecting member, wherein an elastic component and an airbag component for driving the elastic component to be completely accommodated in or partially extended from the sliding channel are arranged in the sliding channel; A second connecting member is circumferentially positioned and axially slidably matched with the first connecting member, and the elastic component provides an elastic force pressing the screw rod to the second connecting member; A third connecting member, a first guide assembly is provided between the third connecting member and the second connecting member for guiding the third connecting member and the second connecting member to move away from each other when encountering resistance in ascending, and a second guide assembly is provided between the third connecting member and the screw rod for guiding the third connecting member and the screw rod to move away from each other when encountering resistance in descending; A distance measuring component is arranged in one of the plurality of lifting legs, for detecting the relative distance between the first connecting member and the second connecting member in the lifting leg, and controlling the airbag component and the driving motor.

[0006] In certain embodiments of the first aspect of the present application, the first guide component comprises: A first guide groove is circumferentially arranged on the side wall of the second connecting member and is inclined upward along a first direction; The first guide column is disposed on the third connecting member and movably cooperates with the first guide groove.

[0007] In certain embodiments of the first aspect of the present application, the second guide component includes: A second guide groove is circumferentially arranged on the side wall of the third connecting member and is inclined downward along the first direction; The second guide column is arranged on the screw rod and movably cooperates with the second guide groove.

[0008] In certain embodiments of the first aspect of the present application, the ranging assembly includes a ranging sensor fixedly arranged at a first height of the outer sleeve, and a folded edge extending outward from the second connecting member, the ranging sensor and the folded edge overlap in the vertical direction, and the ranging sensor is installed on a support arm inside the outer sleeve.

[0009] In certain embodiments of the first aspect of the present application, the airbag assembly includes an airbag and an inflation and deflation device disposed at the top of the sliding channel, and the inflation and deflation device is used to inflate and deflate the airbag.

[0010] In certain embodiments of the first aspect of the present application, the elastic component includes a spring, one end of the spring abuts against the airbag, and the other end of the spring abuts against the top of the second connecting member.

[0011] In certain embodiments of the first aspect of the present application, a first slot with a non-circular cross-section is disposed at the bottom of the first connecting member, and a first plug post with a cross-section adapted to the first slot is disposed at the top of the second connecting member.

[0012] In certain embodiments of the first aspect of the present application, a step structure is formed between the bottom of the sliding channel and the first slot, and when the elastic component is fully accommodated in the sliding channel, the top of the second connecting member, i.e., the first plug, abuts against the step structure.

[0013] In certain embodiments of the first aspect of the present application, the method by which the ranging component controls the airbag component and the drive motor is as follows: Under normal conditions, the airbag assembly is deflated, and the driving elastic assembly is completely accommodated in the sliding channel; When starting to rise or fall, the airbag assembly is inflated, driving the elastic assembly to partially extend out of the sliding channel, and continuously detecting the relative distance between the first connecting member and the second connecting member. When it is detected that the relative distance is less than a first threshold, the airbag assemblies of all lifting legs are controlled to deflate for pressure relief, and at the same time the drive motor is controlled to stop rotating or reverse at a certain angle.

[0014] Compared with the prior art, this application has the following beneficial effects: The lifting leg of the present application is achieved by sequentially arranging a first connecting member, a second connecting member and a third connecting member between a driving motor and a screw rod; an elastic component and an airbag component that drives the elastic component to be completely accommodated in or partially extended from a sliding channel are arranged between the first connecting member and the second connecting member. Under normal circumstances, the elastic component is completely accommodated in the sliding channel to ensure that the first connecting member and the second connecting member will not vibrate in the axial direction due to the action of the elastic component. During the rising or falling process, the elastic component partially extends out of the sliding channel to provide an elastic force to press the screw rod to the second connecting member. Combined with the action of the first guide component and the second guide component, the relative distance between the first connecting member and the second connecting member will change regardless of whether the rising or falling encounters resistance. Finally, the relative distance is output by the distance measuring component. After comparison with the first threshold value, the airbag component is controlled to deflate, thereby realizing the rapid retraction of the table top when encountering resistance when rising or falling.

[0015] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become readily understood. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, wherein: In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0017] Figure 1 Shown is a schematic diagram of the overall structure of the present application.

[0018] Figure 2 A schematic diagram of the lifting leg structure of the present application is shown.

[0019] Figure 3A schematic longitudinal cross-section diagram of the lifting leg of the present application is shown.

[0020] Figure 4 Shows Figure 3 A partial enlarged view of point A in the middle.

[0021] Figure 5 An exploded schematic diagram of the first connecting member, the second connecting member, the third connecting member, and the screw rod of the present application is shown.

[0022] Figure 6 A schematic structural diagram of the first connecting member of the present application is shown.

[0023] Figure 7 A schematic structural diagram of the second connecting member, the third connecting member, and the screw rod of the present application is shown.

[0024] Figure 8 A schematic diagram of the airbag assembly of the present application in an inflated state is shown.

[0025] Fig. 9 A schematic diagram showing the resistance encountered during the rising process of the present application is shown.

[0026] Fig.10 A schematic diagram showing the resistance encountered during the descent process of the present application is shown.

[0027] Description of reference numerals: 10. Table top; 20. Lifting legs; 100, outer sleeve; 101, driving motor; 102, screw; 1021, second guide column; 103, connecting plate; 104, connecting block; 105, supporting arm; 106, ranging sensor; 200, inner sleeve; 201, nut block; 300, first connecting member; 301, sliding channel; 302, first slot; 303, step structure; 310, airbag; 311, inflation and deflation device; 312, gasket; 320, spring; 321, sliding column; 400, second connecting member; 401, folded edge; 402, first plug post; 403, second slot; 410, first guide assembly; 414, first guide groove; 500, third connecting member; 501, second plug post; 502, first guide post; 503, second guide slot; 504, third slot; 510, second guide assembly; 600. Distance measurement component. DETAILED DESCRIPTION

[0028] In order to make the purpose, features, and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0029] This embodiment provides a lifting table that can retreat when encountering obstacles, such as Figure 1 As shown, the lifting table includes a table top 10 and a plurality of lifting legs 20 arranged at the bottom of the table top 10. In this embodiment, a lifting leg 20 is preferably arranged on the left and right sides of the table top 10 respectively to achieve support and lifting of the table top 10.

[0030] Specifically, Figure 2 and Figure 3 As shown, the lifting leg 20 includes: The outer sleeve 100 is provided with a driving motor 101 and a screw rod 102 inside. The driving motor 101 is used to provide rotational power for the screw rod 102 to rotate around the central axis.

[0031] A connecting plate 103 is provided on the top of the outer sleeve 100 for connecting with a device to be lifted or lowered. For example, when the lifting mechanism is used on a lifting table, the connecting plate 103 is used for connecting with a table top.

[0032] The inner sleeve 200 is axially movably sleeved in the outer sleeve 100. A nut block 201 that is threadably matched with the screw rod 102 is fixedly arranged in the inner sleeve 200. The rotation of the screw rod 102 can realize up and down movement relative to the nut block 201, thereby realizing the rise or fall of the outer sleeve 100 relative to the inner sleeve 200.

[0033] It is worth mentioning that in order to further improve the stability of the screw 102, a connecting block 104 is further provided in the outer sleeve 100, and the connecting block 104 is movably matched with the screw 102, that is, the local surface where the screw 102 contacts the connecting block 104 is smooth and no threads are provided.

[0034] In order to realize the outer sleeve 100 to retreat when encountering obstacles during the ascending and descending process, Figure 4 and Figure 5 As shown, in this embodiment, a first connecting member 300 , a second connecting member 400 , and a third connecting member 500 are coaxially arranged between the driving motor 101 and the screw rod 102 .

[0035] The first connecting member 300 is generally columnar and connected to the output shaft of the driving motor 101. Under the action of the driving motor 101, it rotates around the central axis of the screw 102. Figure 4 and Figure 6 A sliding channel 301 is axially arranged in the first connecting member 300 , and an elastic component and an airbag component for driving the elastic component to be completely accommodated in or partially extended from the sliding channel 301 are arranged in the sliding channel 301 .

[0036] Specifically, the airbag assembly includes an airbag 310 and an inflation and deflation device 311 arranged at the top of the sliding channel 301. The inflation and deflation device 311 is used to inflate and deflate the airbag 310. It is worth mentioning that since the first connecting member 300 is in a rotating state during operation, it is not convenient for wiring. Therefore, the inflation and deflation device 311 is wirelessly connected to the controller to realize inflation and deflation control.

[0037] In order to provide sufficient elasticity, in this embodiment, the elastic component includes a spring 320, one end of the spring 320 is against the airbag 310, and the other end is against the top of the second connecting member 400. When the elastic component partially extends out of the sliding channel 301, the spring 320 is used to provide the second connecting member with an elastic force to press the screw 102.

[0038] Since the surface of the airbag 310 is soft and the contact area of ​​the end of the spring 320 is small, in order to prevent the end of the spring 320 from sinking into the airbag 310 or even causing damage to the airbag 310, a gasket 312 is provided between the airbag 310 and the spring 320. The gasket 312 slides with the sliding channel 301 to expand the contact area between the end of the spring 320 and the airbag 310.

[0039] At the same time, the middle part of the spring 320 has a gap. In order to prevent the spring 320 from partially extending out of the sliding channel 301 and, if the pressure is uneven, the spring 320 will be bent, and the gap of the spring 320 will easily interfere with the opening of the sliding channel 301. The elastic component of this embodiment also includes a sliding column 321, which is arranged between the spring 320 and the second connecting member 400 to replace the end of the spring 320. Under the drive of the airbag assembly, the sliding column 321 is completely accommodated in or partially extends out of the sliding channel 301.

[0040] The second connecting member 400 is cylindrical in shape as a whole, and is circumferentially positioned and axially slidably matched with the first connecting member 300 . The elastic component provides elastic force to press the screw rod 102 to the second connecting member 400 .

[0041] Please refer to Figure 6 and Figure 7Specifically, in order to achieve circumferential positioning and axial sliding fit between the first connector 300 and the second connector 400, a first slot 302 with a non-circular cross section is provided at the bottom of the first connector 300, and a first plug 402 with a cross section adapted to the first slot 302 is provided at the top of the second connector 400. It should be noted that the cross sections of the first slot 302 and the first plug 402 of this embodiment are similar to an ellipse. When the first plug 402 is inserted into the first slot 302, the second connector 400 can slide axially and be circumferentially positioned relative to the first connector 300.

[0042] It is also worth mentioning that a step structure 303 is formed between the bottom of the sliding channel 301 and the side wall of the first connecting member 300, i.e., the first slot 302. When the elastic component is fully accommodated in the sliding channel 301, the top of the second connecting member 400, i.e., the first plug 402, abuts against the step structure 303, thereby avoiding axial vibration of the whole due to the spring 320.

[0043] The third connecting member 500 is columnar as a whole, and a first guide component 410 is provided between the third connecting member 500 and the second connecting member 400 for guiding the third connecting member 500 and the second connecting member 400 away from each other when encountering resistance during ascent, and a second guide component 510 is provided between the third connecting member 500 and the screw rod 102 for guiding the third connecting member 500 and the screw rod 102 away from each other when encountering resistance during descent.

[0044] It should be noted that during the normal ascent or descent of the outer sleeve 100 , the first guide assembly 410 guides the third connecting member 500 to rotate synchronously with the second connecting member 400 , and the second guide assembly 510 also guides the third connecting member 500 to rotate synchronously with the screw 102 .

[0045] To achieve the above guidance effect, please refer to Figure 7 and Fig. 9 , the first guide component 410 includes: The first guide groove 414 is circumferentially disposed on the side wall of the second connecting member 400 and is inclined upward along the first direction, specifically, gradually inclined upward along the counterclockwise direction.

[0046] The first guide column 502 is disposed on the third connecting member 500 and movably cooperates with the first guide slot 414. It should also be noted that when the first guide column 502 is located at the highest point of the first guide slot 414, the second plug column 501 is just inserted to the bottom of the second slot 403.

[0047] Similarly, the second guiding component 510 includes: The second guide groove 503 is circumferentially disposed on the side wall of the third connecting member 500 and is inclined downward along the first direction, specifically, gradually inclined downward along the counterclockwise direction.

[0048] The second guide post 1021 is disposed on the screw rod 102 and movably cooperates with the second guide groove 503. When the second guide post 1021 is located at the highest point of the second guide groove 503, the top of the screw rod 102 is just inserted into the bottom of the third slot 504.

[0049] Please refer to Figure 8 In the normal lifting process, the second connecting member 400 is subjected to the elastic force of the spring 320, and forms a fixed first spacing with the first connecting member 300. At this time, the first guide column 502 is located at the highest point of the first guide groove 414, that is, the end of the groove in the counterclockwise direction. The second guide column 1021 is located at the highest point of the second guide groove 503, that is, the beginning of the groove in the counterclockwise direction.

[0050] Please refer to Fig. 9 , taking the counterclockwise rotation of the first connecting member 300, the second connecting member 400, and the third connecting member 500 as an example, when the ascending process is blocked, the outer sleeve 100 and the inner sleeve 200 are relatively stationary, resulting in the obstruction of the rotation of the screw 102. At this time, since the second guide column 1021 is located at the first groove of the second guide groove 503 in the counterclockwise direction, the third connecting member 500 is relatively stationary with the screw under the action of the second guide assembly 510; and the first guide column 502 is located at the end of the first guide groove 414, that is, in the counterclockwise direction. Under the rotation force transmitted by the driving motor 101, the first guide groove 414 slides counterclockwise relative to the first guide column 502, resulting in the third connecting member 500 and the second connecting member 400 moving away from each other, that is, the second connecting member 400 gradually moves toward the first connecting member 300, and the spring 320 is compressed and contracted.

[0051] Similarly, please refer to Fig.10 , when encountering resistance during descent, the first connecting member 300, the second connecting member 400, and the third connecting member 500 rotate clockwise, and the outer sleeve 100 and the inner sleeve 200 are relatively stationary, resulting in the obstruction of the rotation of the screw rod 102. At this time, since the first guide post 502 is located at the end of the first guide groove 414 in the counterclockwise direction, the second connecting member 400 is relatively stationary with the third connecting member 500 under the action of the first guide assembly 410; and the second guide post 1021 is located at the beginning of the second guide groove 503, i.e., in the counterclockwise direction. Under the rotation force transmitted by the driving motor 101, the second guide groove 414 slides clockwise relative to the second guide post 1021, resulting in the third connecting member 500 and the screw rod 102 moving away from each other, that is, the third connecting member 500 and the second connecting member 400 gradually move toward the first connecting member 300, and the spring 320 is compressed and contracted.

[0052] In the above process, the elastic force applied by the spring 320 is used to offset the component force in the vertical direction generated between the first guide column 502 and the first guide groove 414 , and the component force in the vertical direction generated between the second guide column 1021 and the second guide groove 503 .

[0053] From the above, we can clearly see that no matter when encountering resistance during ascent or descent, the distance between the second connecting member 400 and the first connecting member 300 will change compared to the normal lifting process. Therefore, by detecting the relative distance between the second connecting member 400 and the first connecting member 300, we can easily identify the situation where the lifting mechanism encounters resistance during ascent / descent.

[0054] The table top 10 of this embodiment is provided with a number of lifting legs 20, and the distance between the second connecting member 400 and the first connecting member 300 in each lifting leg 20 will change, and we only need to measure one of them. Therefore, this embodiment also provides a distance measuring component 600 in one of the several lifting legs to detect the relative distance between the first connecting member 300 and the second connecting member 400 in the lifting leg, and upload it to the controller, thereby realizing the control of the inflation and deflation device and the driving motor.

[0055] The distance measuring assembly 600 includes a distance measuring sensor 106 fixedly arranged at a first height of the outer sleeve 100, and a folded edge 401 extending outwardly from the second connecting member 400. The distance measuring sensor 106 is arranged in a vertically downward direction and overlaps with the folded edge 401 in the vertical direction.

[0056] Specifically, the folded edge 401 is in a regular ring shape, thereby ensuring that it can be detected by the distance sensor 106 at all times during the rotation of the second connecting member 400. In order to achieve the installation of the distance sensor 106, a support arm 105 is provided in the outer sleeve 100, and the distance sensor 106 is installed at the end of the support arm 105.

[0057] Under normal conditions, the airbag components in all lifting legs are deflated, driving the elastic component to be completely contained in the sliding channel 301. At this time, the top of the second connecting member 400 abuts against the step structure 303 in the first connecting member 300, and will not vibrate in the axial direction due to the action of the spring.

[0058] When starting to rise or fall, the airbag components in all the lifting legs are inflated, driving the elastic component to partially extend out of the sliding channel 301, pressing the second connecting member 400 toward the screw 102, and the first guide component 410 and the second guide component 510 guide the second connecting member 400, the third connecting member 500 and the screw 102 to rotate synchronously. Then the driving motor is started to work, so that the relative distance between the first connecting member 300 and the second connecting member 400 can be changed and detected during the lifting process.

[0059] When the ascending or descending encounters resistance, when the relative distance is detected to be less than the set first threshold, the airbag assembly deflates to quickly release the force between the first connecting member 300 and the second connecting member 400 to relieve pressure, thereby achieving a rapid retreat effect, giving the drive motor 101 sufficient reaction time, and controlling the drive motor to stop or reverse a certain angle, such as 360° or 720°. At the same time, the spring 320 can also play a certain buffering effect, thereby protecting the mechanism from being damaged when encountering resistance for the first time because the drive motor 101 does not stop immediately.

[0060] Specifically, when the outer sleeve 100 encounters resistance when rising, the first guide component 410 guides the third connecting member 500 and the second connecting member 400 to move away from each other, and the second connecting member 400 moves toward the first connecting member 300 until the relative distance is less than the first threshold value. The ranging component 600 sends an resistance signal, controls the airbag component to deflate, drives the elastic component to be completely accommodated in the sliding channel, and completes the retreat; at the same time, controls the drive motor 101 to stop running or reverse a certain angle.

[0061] When the outer sleeve 100 encounters resistance when descending, the second guide component 510 guides the third connecting member 500 and the screw 102 to move away from each other, and the third connecting member 500 moves together with the second connecting member 400 toward the first connecting member 300 until the relative distance is less than the first threshold value. The ranging component 600 sends an resistance signal, controls the airbag component to deflate, drives the elastic component to be completely accommodated in the sliding channel, and completes the retreat; at the same time, controls the drive motor 101 to stop running or reverse a certain angle, such as 360° or 720°.

[0062] Please refer to the above for the specific guiding principles of the first guiding component 410 and the second guiding component 510, which will not be elaborated here.

[0063] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this application can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution of this application can be achieved, and this document is not limited here.

[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0065] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A lifting table that can retreat when encountering obstacles, characterized in that: It includes a table top and a plurality of lifting legs arranged at the bottom of the table top; the lifting legs include: An outer sleeve, inside of which a driving motor and a screw are arranged; An inner sleeve, axially movably sleeved in the outer sleeve, wherein a nut block matching with the screw thread is arranged in the inner sleeve; a first connecting member connected to the output shaft of the driving motor, wherein a sliding channel is axially arranged in the first connecting member, wherein an elastic component and an airbag component for driving the elastic component to be completely accommodated in or partially extended from the sliding channel are arranged in the sliding channel; A second connecting member is circumferentially positioned and axially slidably matched with the first connecting member, and the elastic component provides an elastic force pressing the screw rod to the second connecting member; A third connecting member, a first guide assembly is provided between the third connecting member and the second connecting member for guiding the third connecting member and the second connecting member to move away from each other when encountering resistance in ascending, and a second guide assembly is provided between the third connecting member and the screw rod for guiding the third connecting member and the screw rod to move away from each other when encountering resistance in descending; A distance measuring component is arranged in one of the plurality of lifting legs, for detecting the relative distance between the first connecting member and the second connecting member in the lifting leg, and controlling the airbag component and the driving motor.

2. The lifting table capable of retreating upon encountering an obstacle according to claim 1, characterized in that: The first guide component comprises: A first guide groove is circumferentially arranged on the side wall of the second connecting member and is inclined upward along a first direction; The first guide column is disposed on the third connecting member and movably cooperates with the first guide groove.

3. The lifting table capable of retreating upon encountering an obstacle according to claim 2, characterized in that: The second guide component comprises: A second guide groove is circumferentially arranged on the side wall of the third connecting member and is inclined downward along the first direction; The second guide column is arranged on the screw rod and movably cooperates with the second guide groove.

4. The lifting table capable of retreating upon encountering an obstacle according to claim 1, characterized in that: The distance measuring assembly includes a distance measuring sensor fixedly arranged at a first height of the outer sleeve, and a folded edge extending outwardly from the second connecting member, the distance measuring sensor and the folded edge overlap in the vertical direction, and the distance measuring sensor is installed on a support arm inside the outer sleeve.

5. The lifting table capable of retreating upon encountering an obstacle according to claim 1, characterized in that: The airbag assembly comprises an airbag and an inflation and deflation device arranged at the top of the sliding channel, and the inflation and deflation device is used for inflating and deflation of the airbag.

6. The lifting table capable of retreating when encountering an obstacle according to claim 5, characterized in that: The elastic component comprises a spring, one end of which abuts against the airbag, and the other end of which abuts against the top of the second connecting member.

7. The lifting table capable of retreating upon encountering an obstacle according to claim 1, characterized in that: A first slot with a non-circular cross section is disposed at the bottom of the first connecting member, and a first plug post with a cross section adapted to the first slot is disposed at the top of the second connecting member.

8. The lifting table capable of retreating when encountering an obstacle according to claim 7, characterized in that: A step structure is formed between the bottom of the sliding channel and the first slot. When the elastic component is completely accommodated in the sliding channel, the top of the second connecting member, namely the first plug post, abuts against the step structure.

9. The lifting table capable of retreating upon encountering an obstacle according to claim 1, characterized in that: The method by which the distance measuring component controls the airbag component and the drive motor is as follows: Under normal conditions, the airbag assembly is deflated, and the driving elastic assembly is completely accommodated in the sliding channel; When starting to rise or fall, the airbag assembly is inflated, driving the elastic assembly to partially extend out of the sliding channel, and continuously detecting the relative distance between the first connecting member and the second connecting member. When it is detected that the relative distance is less than a first threshold, the airbag assemblies of all lifting legs are controlled to deflate for pressure relief, and at the same time the drive motor is controlled to stop rotating or reverse at a certain angle.

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