Resistance detection stand column suitable for larger load range

Abstract

The utility model provides a resistance detection stand column suitable for a larger load range, which comprises a motor box and a telescopic support component, a connecting piece at the upper end of the telescopic support component is connected with the motor box through a screw, and an elastic sheet is mounted on a step part of the connecting piece through the screw and then locked on the motor box; a deformation space is formed on the step part around the screw, and an induction sheet is arranged on the elastic sheet to detect the resistance condition; when the load of the stand column is increased, the downward force exerted by the screw on the elastic piece is increased, the elastic piece deforms in the deformation space with the center bent and sunken downwards and deforms and sinks along with the increase of the load, and similarly, when the stand column meets resistance, the force exerted by the screw on the elastic piece changes, and the elastic piece deforms in the deformation space; the induction sheet collects the deformation quantity of the elastic sheet; the induction piece is arranged on the elastic piece, the elastic piece has good elasticity, the deformation capacity of the elastic piece is better than that of components such as a motor box and a bearing fixing plate, and resistance detection is more sensitive.

Description

Technical Field

[0001] This utility model relates to the field of furniture, and in particular to an obstacle detection column that can adapt to a wider load range. Background Technology

[0002] With the rise of the concepts of healthy living and healthy working, ergonomic furniture is becoming increasingly popular in our daily lives and offices, including height-adjustable desks. The emergence of height-adjustable desks has freed people from restrictions on their working posture. They can not only work sitting in a chair as usual, but also stand up to work when they feel uncomfortable from sitting for a long time. This effectively alleviates the health problems caused by prolonged sitting for those who work at a desk for extended periods.

[0003] A dual-motor driven height-adjustable desk typically includes a tabletop, a crossbeam, and retractable legs on both sides. The crossbeam is installed under the tabletop, and the legs are installed at the left and right ends of the crossbeam. When the legs are extended or retracted by the motor, the tabletop also rises or falls accordingly. Each leg includes two sleeved columns, and a screw drive mechanism is installed inside the columns. The screw drive mechanism includes a screw connected to the motor and a square tube threaded to the screw. The motor drives the screw drive mechanism to achieve the extension and retraction movement.

[0004] The motor drives the table legs to move, which in turn raises and lowers the tabletop. The tabletop's movement is linear. However, in actual use, it's impossible to guarantee that the space above and below the table will be completely open. This means that the table will encounter obstacles or obstructions during its movement. This can damage the motor or transmission mechanism of the table, harm the obstruction, or even pose a safety hazard to the user or children. Therefore, the obstacle detection and reversal function of the table is particularly important.

[0005] In existing products, the methods for detecting obstruction are generally to use current detection, gyroscope detection, or induction plate detection. In induction plate detection, the induction plate needs to collect deformation and convert it into an electrical signal for obstruction detection. The key point is how to enhance the deformation capability to detect obstruction sensitively. Summary of the Invention

[0006] To address the aforementioned technical problems, this utility model provides an obstacle detection column adaptable to a wider load range, comprising a motor housing and a telescopic support assembly. The upper connector of the telescopic support assembly is connected to the motor housing via screws. The screws mount an elastic plate on the stepped portion of the connector and then lock it to the motor housing. A deformation space is formed on the stepped portion around the screws. A sensing element is mounted on the elastic plate to detect obstacle detection. When the load on the column increases, the screw exerts a downward force on the elastic plate, causing it to bend and sink downwards in the deformation space as the load increases. Similarly, when the column encounters an obstacle, the force exerted by the screw on the elastic plate changes, causing the elastic plate to deform in the deformation space. The sensing element collects this deformation. The sensing element is mounted on the elastic plate, which possesses excellent elasticity and a better deformation capacity than components such as the motor housing and bearing mounting plate, making obstacle detection more sensitive.

[0007] The technical solution of this utility model is implemented as follows:

[0008] An obstacle detection column adaptable to a wider load range includes a motor housing and a telescopic support assembly. The upper end of the telescopic support assembly has a connector, which is connected to the motor housing by screws. The connector has a stepped portion with a hole in the center for mounting the screw. An elastic plate is provided on the stepped portion, located between the stepped portion and the screw. A deformation space is formed on the stepped portion around the screw. The elastic plate and the stepped portion are configured such that when the load on the column increases, the screw applies an increased downward force to the elastic plate, causing the elastic plate to deform downward and sink in the deformation space as the load increases. A sensing element is provided on the elastic plate, configured to convert the deformation of the elastic plate into an electrical signal for determining the obstacle detection status.

[0009] When the column encounters an obstacle, the force exerted by the screw on the elastic plate changes, causing the elastic plate to deform in the deformation space. The sensing plate collects the deformation of the elastic plate. The sensing plate is placed on the elastic plate, which has good elasticity and its deformation capacity is better than that of components such as motor boxes and bearing fixing plates, making the obstacle detection more sensitive.

[0010] Preferably, the stepped section includes 1-5 steps. The number of steps in the stepped section can be selected according to different usage requirements. A single step can solve the problem of resistance detection sensitivity, while multiple steps can solve the problem of preventing the elastic sheet from reducing detection sensitivity due to permanent creep under heavy loads.

[0011] Preferably, the stepped portion includes a first step, a second step, and a third step, the heights of which decrease sequentially and their diameters decrease sequentially. A first deformation space is formed on the inner side of the first step, a second deformation space is formed on the inner side of the second step, and a third deformation space is formed on the inner side of the third step. The elastic sheet has an initial state in which it abuts against the first step. When the load on the column increases, the screw applies an increased downward force to the elastic sheet, causing it to deform downward and contact the second and third steps as the load increases. When the elastic sheet contacts the first step and bends downward, it deforms within the first deformation space. When the elastic sheet contacts the second step and bends downward, it deforms within the second deformation space. When the elastic sheet contacts the third step, it deforms within the third deformation space.

[0012] The stepped section forms a first step, a second step, and a third step through multiple indentations from the outside in. Initially, the elastic plate only contacts the first step, and its deformation radius is equal to the inner radius of the first step. As the desktop load gradually increases, the downward load on the tabletop and motor housing increases. The connecting parts remain stable and fixed due to the bearing on the lead screw and cannot move downwards. The screw, under the influence of the motor housing, experiences a downward load force. The elastic plate, affected by the screw, undergoes a downward deformation, with its center concave downwards. As the screw load increases, after a certain degree of deformation, the elastic plate contacts the second step, and its deformation radius is equal to that of the second step. The inner radius of the first step is increased; further increasing the desktop load, the elastic sheet deforms further and comes into contact with the third step, and its deformation radius is the inner radius of the third step; as the elastic sheet gradually changes from contacting the first step to contacting the third step, the deformation radius of the elastic sheet also decreases, the elastic sheet becomes harder, the load-bearing capacity is stronger, and it can maintain normal operation under heavy load. Moreover, under heavy load, the elastic sheet can still deform to provide the sensing sheet for obstruction detection, ensuring the effective operation of the obstruction detection function. This solution can achieve obstruction detection under heavy load at low cost and increases the working stability of the obstruction detection function.

[0013] The larger the deformation radius of the elastic sheet, the larger the deformable portion or area, and the softer and more easily deformed it becomes. This makes it less capable of providing sufficient load-bearing capacity. When the elastic sheet is subjected to excessive load and cannot deform further, the sensor loses its ability to detect obstruction, posing a safety hazard during table adjustments. The stepped section in this design prevents the elastic sheet from being constantly in a large-radius deformation state, thus avoiding permanent creep and the weakening or loss of obstruction detection effectiveness. The radius determines the lever arm. Under the same load, a larger lever arm results in a larger torque, requiring a greater elastic force to counteract the torque, and necessitating greater deformation of the elastic sheet. Conversely, a smaller lever arm results in a smaller torque and less deformation. Reducing the lever arm prevents excessive deformation and damage or permanent creep under heavy loads, ensuring detection sensitivity while extending service life and guaranteeing stable and effective obstruction detection.

[0014] Preferably, the first, second, and third steps are all annular, distributed from the outside in, with their heights decreasing sequentially. The stepped sections form the first, second, and third steps through intermittent height decreases. When the elastic sheet bends and caves inward, it can sequentially contact the first, second, and third steps, preventing the elastic sheet from becoming unsupported and undergoing large-area deformation when it caves in. This prevents creep of the elastic sheet, which would affect the resistance detection effect.

[0015] Preferably, a first clearance hole is formed at the center of the stepped portion, and a second clearance hole is formed at the center of the elastic sheet. The screw passes through the first and second clearance holes and connects to the motor box. The screw serves both to connect the connector to the motor box and to act on the elastic sheet. Therefore, a second clearance hole is formed on the elastic sheet to allow the screw to act on it, and a first clearance hole is formed on the stepped portion to allow the screw to pass through the elastic sheet and the stepped portion to connect to the motor box.

[0016] Preferably, the screw has a head that abuts against the elastic sheet downwards. The diameter of the screw head is larger than the second clearance hole of the elastic sheet, thereby allowing the screw to contact the elastic sheet and causing the elastic sheet to deform when the load is increased or when resistance is encountered.

[0017] Preferably, the diameter of the second clearance hole on the elastic sheet is smaller than the diameter of the first clearance hole on the step. A portion of the elastic sheet is located in the first clearance hole, so that when the elastic sheet comes into contact with the third step, it can still continue to deform downwards without affecting the obstruction detection function at this time.

[0018] Preferably, the connector is installed inside the motor housing; the motor housing has an upwardly protruding connector seat, which is positioned within the first clearance hole. The upward protrusion of the connector seat provides more contact when the screw is connected to the motor housing, making the connection between the screw and the motor housing more secure.

[0019] Preferably, the sensing sheet is in the shape of a circular ring. The circular sensing sheet is attached to the elastic sheet and can cover the circumference of the elastic sheet. Such a sensing sheet can sensitively detect deformation at any position on the elastic sheet.

[0020] Preferably, the sensing element is circular and located beside the screw. Circular sensing elements are less expensive and can still detect deformation of the elastic element.

[0021] Preferably, the sensing sheet is attached to an elastic sheet.

[0022] Preferably, the connector extends downward to form a mounting portion, and a bearing is installed in the mounting portion; the telescopic support assembly also includes a lead screw, and the bearing is disposed at the upper end of the lead screw and tightly connected to the lead screw.

[0023] The design starting point, concept, and beneficial effects of this utility model, which adopts the above technical solution, are as follows:

[0024] When the column encounters an obstacle, the force exerted by the screw on the elastic plate changes, causing the elastic plate to deform in the deformation space. The sensing plate collects the deformation of the elastic plate. The sensing plate is placed on the elastic plate, which has good elasticity and its deformation capacity is better than that of components such as motor boxes and bearing fixing plates, making the obstacle detection more sensitive.

[0025] Furthermore, the stepped section forms a first step, a second step, and a third step through multiple indentations from the outside in. Initially, the elastic plate only contacts the first step, and its deformation radius is equal to the inner radius of the first step. As the desktop load gradually increases, the downward load on the tabletop and motor box increases. The connecting parts remain stable and fixed due to the bearing on the screw and cannot move downwards. The screw, under the influence of the motor box, has a downward load force. The elastic plate, affected by the screw, undergoes a downward deformation, with its center concave downwards. As the screw load increases, after a certain degree of deformation, the elastic plate contacts the second step, and its deformation radius becomes equal to the inner radius of the first step. The inner radius of the second step; further increasing the desktop load, the elastic sheet deforms further and comes into contact with the third step, its deformation radius being the inner radius of the third step; as the elastic sheet gradually changes from contacting the first step to contacting the third step, the deformation radius of the elastic sheet also decreases, the elastic sheet becomes harder, and the load-bearing capacity is stronger, enabling it to maintain normal operation under heavy loads. Moreover, under heavy loads, the elastic sheet can still deform to allow the sensing element to perform obstacle detection, ensuring the effective operation of the obstacle detection function. This solution can achieve obstacle detection under heavy loads at low cost, increasing the working stability of the obstacle detection function.

[0026] The larger the deformation radius of the elastic sheet, the larger the deformable portion or area, and the softer and more easily deformed it becomes. This makes it less capable of providing sufficient load-bearing capacity. When the elastic sheet is subjected to excessive load and cannot deform further, the sensor loses its ability to detect obstruction, posing a safety hazard during table adjustments. The stepped section in this design prevents the elastic sheet from being constantly in a large-radius deformation state, thus avoiding permanent creep and the weakening or loss of obstruction detection effectiveness. The radius determines the lever arm. Under the same load, a larger lever arm results in a larger torque, requiring a greater elastic force to counteract the torque, and necessitating greater deformation of the elastic sheet. Conversely, a smaller lever arm results in a smaller torque and less deformation. Reducing the lever arm prevents excessive deformation and damage or permanent creep under heavy loads, ensuring detection sensitivity while extending service life and guaranteeing stable and effective obstruction detection. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the column in an embodiment of the present invention;

[0028] Figure 2 This is a three-dimensional sectional view of the column in an embodiment of the present invention;

[0029] Figure 3 This is an exploded view of the connector, elastic sheet, and sensing sheet arranged inside the motor box in an embodiment of the present invention;

[0030] Figure 4 This is a three-dimensional sectional view of the connector, elastic sheet, and sensing sheet arranged inside the motor box in an embodiment of the present invention.

[0031] Figure 5 This is a cross-sectional view of the connector, elastic sheet, and sensing sheet arranged inside the motor box in an embodiment of the present invention.

[0032] Figure 6 This is an exploded view of the internal structure of the motor box in the column in an embodiment of the present invention;

[0033] Figure 7 This is a flowchart illustrating the method of using the column in an embodiment of this utility model.

[0034] The reference numerals in the attached drawings are as follows: motor box 1; connector 2; screw 3; step 4; first step 41; second step 42; third step 43; elastic sheet 5; sensing sheet 6; inner tube 7; lead screw shaft 9; bearing 10; mounting part 11; motor 12; first clearance hole 13; second clearance hole 14; connecting seat 15; first deformation space 16; second deformation space 17; third deformation space 18. Detailed Implementation

[0035] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0036] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0037] In the description of this utility model, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] The specific implementation of this utility model is as follows:

[0039] like Figure 1-3As shown, this utility model provides an obstacle detection column adaptable to a wider load range, including a motor 12 box 1 and a telescopic support assembly. The upper end of the telescopic support assembly has a connector 2, which is connected to the motor 12 box 1 by screws 3. The connector 2 includes a stepped portion 4, which includes 1-5 steps. The number of steps in the stepped portion 4 can be selected according to different usage requirements. A single step can solve the problem of obstacle detection sensitivity, while multiple steps can solve the problem of preventing the elastic sheet from reducing detection sensitivity due to permanent creep under heavy loads. In this embodiment, the stepped portion 4 has multiple steps, including a first step 41, a second step 42, and a third step 43. The height of the first step 41, the second step 42, and the third step 43 decreases sequentially, and their diameters decrease sequentially. The center of the stepped portion 4 has an opening for installing the screws 3. An elastic sheet 5 is provided on the stepped portion 4, which is located between the stepped portion 4 and the screws 3. A first deformation is formed on the inner side of the first step 41. Space 16, a second deformation space 17 is formed inside the second step 42, and a third deformation space 18 is formed inside the third step 43; the elastic sheet 5 has an initial state in which it abuts against the first step 41; the elastic sheet 5 has an initial state in which it abuts against the first step 41; the elastic sheet 5 and the step portion 4 are configured such that when the load on the column increases, the screw 3 increases the downward force applied to the elastic sheet 5, and the elastic sheet 5 undergoes a deformation of bending and concave downward in the center, and changes with the load. As the elastic sheet 5 increases, it sequentially contacts the second step 42 and the third step 43; when the elastic sheet 5 contacts the first step 41 and bends downward, the elastic sheet 5 deforms in the first deformation space 16; when the elastic sheet 5 contacts the second step 42 and bends downward, the elastic sheet 5 deforms in the second deformation space 17; when the elastic sheet 5 contacts the third step 43, the elastic sheet 5 deforms in the third deformation space 18; the elastic sheet 5 is provided with a sensing piece 6, which is configured to convert the deformation of the elastic sheet 5 into an electrical signal for judging the obstruction situation.

[0040] The step 4 is formed by multiple indentations from the outside in, creating a first step 41, a second step 42, and a third step 43. Initially, the elastic piece 5 only contacts the first step 41, and its deformation radius is equal to the inner radius of the first step 41. As the desktop load gradually increases, the downward load on the tabletop and motor 12 box 1 increases. The connecting piece 2 remains stable and fixed due to the bearing 10 on the lead screw and cannot move downwards. The screw 3, under the influence of the motor 12 box 1, experiences a downward load force. The elastic piece 5, affected by the screw 3, undergoes a downward-concave deformation. As the load force on the screw 3 increases, after a certain degree of deformation, the elastic piece 5 contacts the second step 42, and its deformation... The radius is the inner radius of the second step 42; further increasing the desktop load, the elastic sheet 5 deforms further and comes into contact with the third step 43, and its deformation radius is the inner radius of the third step 43; as the elastic sheet 5 gradually changes from contacting the first step 41 to contacting the third step 43, the deformation radius of the elastic sheet 5 also decreases, the elastic sheet 5 becomes harder, the load-bearing capacity is stronger, and it can maintain normal operation under heavy load. Moreover, under heavy load, the elastic sheet 5 can still deform to allow the sensing sheet 6 to perform obstacle detection, ensuring the effective operation of the obstacle detection function. This scheme can achieve obstacle detection under heavy load at low cost and increases the working stability of the obstacle detection function.

[0041] The larger the deformation radius of the elastic plate 5, the larger the deformable part or area of ​​the elastic plate 5, and the softer its elasticity, making it more prone to deformation and unable to provide sufficient load-bearing capacity. When the elastic plate 5 is subjected to excessive load and cannot deform further, the sensing element 6 loses its function of detecting obstruction, posing a safety hazard when the lifting table is raised or lowered. The step portion 4 in this design prevents the elastic plate 5 from always being in a large-radius deformation state, thereby preventing permanent creep of the elastic plate 5 and weakening or eliminating the obstruction detection effect. The radius determines the lever arm size. Under the same load, a larger lever arm results in a larger torque, requiring a greater elastic force to counteract the torque, and thus requiring the elastic plate 5 to deform more. A smaller lever arm results in a smaller torque, and the elastic plate 5 can deform less. Reducing the lever arm prevents the elastic plate 5 from excessively deforming and being damaged or developing permanent creep under heavy loads, ensuring detection sensitivity while extending its service life and ensuring the stable and effective obstruction detection function.

[0042] The key feature of this column is its obstacle detection function, which can adapt to large loads and has an effective obstacle detection capability over a wider load range.

[0043] The obstacle detection is achieved as follows: the elastic plate 5 and the sensing plate 6 are pressed onto the connector 2 by the screw 3. When there is a load change, the force is transmitted to the screw 3 and the elastic plate 5 through the connector 2. Obstacle detection and retraction are achieved by the deformation of the elastic plate 5 and the signal of the sensing plate 6.

[0044] Adapting to a wider load range: By using the multi-stage steps on the connector 2 and the deformation of the elastic sheet 5, the diameter of the elastic sheet 5 is changed (the smaller the force-bearing diameter, the harder the elastic sheet 5), so that the elastic sheet 5 will not permanently creep under large loads (similar to the principle of shock absorbers in truck chassis).

[0045] Specifically, such as Figure 1 , 2 As shown, the telescopic support assembly also includes a telescopic sleeve, a push rod, and a support. The telescopic sleeve includes an inner tube 7 and an outer tube (not shown), which are sleeved together and slide against each other. The outer tube is sleeved outside the inner tube 7. The push rod is located in the inner tube 7, with its lower end fixedly connected to the outer tube. The upper end of the push rod is a lead screw shaft 9, on which a bearing 10 is fixedly mounted. The bearing 10 is tightly fitted to the lead screw shaft 9. The connecting piece 2 extends downward to form a mounting part 11, in which the bearing 10 is mounted. The connecting piece 2 is located inside the motor 12 housing 1, which also houses a motor 1212. The motor 1212 is connected to the lead screw shaft 9 in a transmission manner.

[0046] like Figure 3-6 As shown, each of the connecting parts on both sides of the mounting part 11 is provided with a step part 4. The center of the step part 4 is opened to form a first clearance hole 13. A connecting seat 15 is provided on the bottom plate of the motor 12 box 1. The connecting seat 15 is located in the first clearance hole 13. The connecting seat 15 is used for threaded connection with the screw 3. The connecting seat 15 protrudes upward to provide more contact when the screw 3 is connected to the motor 12 box 1, making the connection between the screw 3 and the motor 12 box 1 more stable.

[0047] An elastic plate 5 is placed on each of the two stepped portions 4. A second clearance hole 14 is formed by opening the center of the elastic plate 5. The screw 3 passes through the first clearance hole 13 and the second clearance hole 14 and connects to the connecting seat 15 of the motor 12 box 1. The screw 3 needs to both connect the connecting part 2 to the motor 12 box 1 and act on the elastic plate 5. Therefore, the second clearance hole 14 is opened on the elastic plate 5 so that the screw 3 can act on the elastic plate 5, and the first clearance hole 13 is opened on the stepped portion 4 so that the screw 3 can pass through the elastic plate 5 and the stepped portion 4 to connect with the motor 12 box 1. The screw 3 has a head, and the head of the screw 3 abuts against the elastic plate 5 downward. The diameter of the head of the screw 3 is larger than the second clearance hole 14 of the elastic plate 5, so that the screw 3 contacts the elastic plate 5, so that when the load is increased or when resistance is encountered, the screw 3 acts on the elastic plate 5 to deform the elastic plate 5.

[0048] In addition, the diameter of the second clearance hole 14 on the elastic sheet 5 is smaller than the diameter of the first clearance hole 13 on the step portion 4; a portion of the elastic sheet 5 is located in the first clearance hole 13, so that when the elastic sheet 5 comes into contact with the third step 43, the elastic sheet 5 can still continue to deform downwards, without affecting the obstruction detection function at this time.

[0049] The sensing element 6 is a piezoelectric element or strain gauge, and can be in various shapes, with circular or annular shapes being the most common. Circular sensing elements 6 are less expensive and can detect the deformation of the elastic sheet 5, and can be directly attached to the elastic sheet 5 next to the screw 3. Annular sensing elements 6 are attached to the elastic sheet 5 and can cover the circumference of the elastic sheet 5. Such sensing elements 6 can sensitively detect the deformation at any position on the elastic sheet 5. For better detection sensitivity, annular sensing elements 6 are selected in this embodiment.

[0050] The first step 41, the second step 42, and the third step 43 are all annular in shape, distributed from the outside to the inside, with their heights decreasing sequentially. The step portion 4 forms the first step 41, the second step 42, and the third step 43 through intermittent height decreases. When the elastic sheet 5 bends and sinks inward, it can sequentially contact the first step 41, the second step 42, and the third step 43, without causing the elastic sheet 5 to deform significantly over a large area due to lack of support when it sinks inward. This prevents the elastic sheet 5 from creeping and affecting the resistance detection effect.

[0051] like Figure 7 As shown, the method of using this column is as follows:

[0052] S1 Assembly: Place the connector 2 in the motor 12 housing 1, place the elastic sheet 5 in the step portion 4, and then use the screw 3 to pass through the elastic sheet 5 and the step portion 4 and lock it with the motor 12 housing 1. Apply a preload force to the elastic sheet 5 with the screw 3 and make the elastic sheet 5 have an initial deformation. At this time, the elastic sheet 5 is in contact with the first step 41, and the deformation radius of the elastic sheet 5 is the inner circle radius of the first step 41. The sensing sheet 6 is set on the elastic sheet 5.

[0053] S2 loading: The load on the column is increased so that the downward pressure applied by the screw 3 to the elastic plate 5 is greater than the preload. The elastic plate 5 will have an indentation greater than the initial deformation, and will contact the second step 42 and the third step 43 in sequence as the load increases; the elastic plate 5 has three states:

[0054] S2-1 First loading state: After the load on the column increases, the elastic sheet 5 contacts the first step 41, while separating from the second step 42 and the third step 43; the deformation radius of the elastic sheet 5 is still the inner circle radius of the first step 41.

[0055] S2-2 Second loading state: After the load on the column increases, the elastic sheet 5 contacts the second step 42 and separates from the third step 43; the deformation radius of the elastic sheet 5 decreases to be the same as the inner circle radius of the second step 42.

[0056] S2-3 Third loading state: After the load on the column increases, the elastic sheet 5 contacts the third step 43; the deformation radius of the elastic sheet 5 decreases to be the same as the inner circle radius of the third step 43;

[0057] S3 Loading and Obstacle Detection: The sensing element 6 detects the relative deformation of the elastic element 5 in the above three states and transmits the converted signal to the control unit. The control unit controls the motor 1212 to stop and rotate in the reverse direction.

[0058] Step S3 also includes:

[0059] S3-1 Obstruction detection in the first loading state: After loading, the sensing sheet 6 detects the absolute deformation of the elastic sheet 5. When the absolute deformation of the elastic sheet 5 is within the first determination range, the elastic sheet 5 is determined to be in the first loading state. When the column is raised and lowered, if the sensing sheet 6 detects that the elastic sheet 5 has deformed and the relative deformation exceeds the first deformation range, the control unit controls the motor 1212 to stop and rotate in the opposite direction.

[0060] S3-2 Obstacle detection in the second loading state: After loading, the sensor 6 detects the absolute deformation of the elastic sheet 5. When the absolute deformation of the elastic sheet 5 is within the second determination range, the elastic sheet 5 is determined to be in the second loading state. When the column is raised and lowered, if the sensor 6 detects that the elastic sheet 5 has deformed and the relative deformation exceeds the second deformation range, the control unit controls the motor 1212 to stop and rotate in the opposite direction.

[0061] S3-3 Obstacle detection in the third loading state: After loading, the sensor 6 detects the absolute deformation of the elastic sheet 5. When the absolute deformation of the elastic sheet 5 is within the third determination range, the elastic sheet 5 is determined to be in the third loading state. When the column is raised or lowered, if the sensor 6 detects that the elastic sheet 5 has deformed and the relative deformation exceeds the third deformation range, the control unit controls the motor 1212 to stop and rotate in the opposite direction.

[0062] In the initial state, the elastic sheet 5 is not pre-tightened by the screw 3. After being pre-tightened by the screw 3, the elastic sheet 5 is in the first loading state. When loading the column, as long as the elastic sheet 5 is in contact with the first step 41, the elastic sheet 5 is in the first loading state.

[0063] In step S1, screw 3 applies a preload to elastic plate 5, causing elastic plate 5 to undergo initial deformation. The head of screw 3 is only located above elastic plate 5. When the tabletop encounters resistance below, elastic plate 5, due to its initial deformation, will tend to recover its deformation because the head of screw 3 tends to move upward. This tendency is captured by sensor 6 and can still be used as a signal to determine if resistance is encountered, thus achieving bidirectional resistance detection. Similarly, in the second and third loading states, elastic plate 5 is already under pressure and has elastic deformation. When resistance is encountered below, the deformation will also generate a relative deformation when it recovers, which sensor 6 can also detect.

[0064] In step S3, the sensing element 6 will perform obstacle detection on the elastic sheet 5 in three states. In the three states, the deformation radius of the elastic sheet 5 is the inner circle radius of the first step 41, the inner circle radius of the second step 42, and the inner circle radius of the third step 43, respectively. The deformation radius of the elastic sheet 5 decreases in sequence, and the part of the elastic sheet 5 that can deform also decreases. This achieves the goal of having a smaller deformation radius and deformable part of the elastic sheet 5 under a larger load, thereby preventing creep and enabling stable and effective obstacle detection under different load conditions.

[0065] Further, in step S, the state is determined by detecting the absolute deformation of the elastic sheet 5 continuously maintained by the sensor 6. For the first loading state, the second loading state, and the third loading state, the control unit has three corresponding different deformation ranges. When the column is being raised and lowered, the sensor 6 first determines the state of the elastic sheet 5 and compares the subsequent relative deformation of the elastic sheet 5 with the corresponding deformation range. When the sensor 6 detects a relative deformation exceeding the corresponding deformation range, the control unit determines that the column is obstructed, and the control unit controls the motor 1212 to stop and rotate in the opposite direction.

[0066] Therefore, in step S3, the control unit is provided with a first determination range, a second determination range and a third determination range corresponding to the first loading state, the second loading state and the third loading state. The first determination range is smaller than the second determination range and the second determination range is smaller than the third determination range. The control unit is also provided with a first deformation range, a second deformation range and a third deformation range corresponding to the first loading state, the second loading state and the third loading state. The first deformation range is larger than the second deformation range and the second deformation range is larger than the third deformation range.

[0067] The absolute deformation mentioned above refers to the total deformation generated by the elastic element from its undeformed state to its current deformation state; the relative deformation refers to the deformation generated when the elastic element 5 deforms again after being in the first, second, or third loading state; the deformation range refers to the range at which the relative deformation generated by the elastic element 5 exceeds the deformation range, at which point it will be judged as encountering resistance; the determination range is based on the current absolute deformation of the elastic element 5 to determine whether the elastic element 5 belongs to the first, second, or third loading state; the deformation range is based on the deformation generated by the elastic element 5. The relative deformation is used to determine the obstruction status of the column; therefore, the first, second, and third determination ranges increase sequentially, and each deformation range starts from zero. The deformation capacity of the elastic sheet 5 varies under different conditions. If the same deformation range is used to determine the obstruction, it will not be accurate enough. As the elastic sheet 5 is in the first, second, and third loading states, the deformation capacity of the elastic sheet 5 decreases, and the deformation range should decrease accordingly to ensure that it has sensitive obstruction detection under different conditions, that is, it can also have effective obstruction detection capability under greater load.

Claims

1. An obstacle detection column adaptable to a wider load range, characterized in that: The device includes a motor housing and a telescopic support assembly. The upper end of the telescopic support assembly has a connector, which is connected to the motor housing by screws. The connector has a stepped portion with a hole in the center for mounting the screw. An elastic plate is provided on the stepped portion, located between the stepped portion and the screw. A deformation space is formed on the stepped portion around the screw. The elastic plate and the stepped portion are configured such that when the load on the column increases, the screw applies an increased downward force to the elastic plate, causing the elastic plate to deform downward and sink in the deformation space as the load increases. A sensing plate is provided on the elastic plate, which is configured to convert the deformation of the elastic plate into an electrical signal for judging the obstruction situation.

2. The obstacle detection column adaptable to a wider load range according to claim 1, characterized in that: The stepped section includes 1 to 5 steps.

3. The obstacle detection column adaptable to a wider load range according to claim 1, characterized in that: The stepped section includes a first step, a second step, and a third step, with the heights and diameters of the three steps decreasing sequentially. A first deformation space is formed inside the first step, a second deformation space is formed inside the second step, and a third deformation space is formed inside the third step. The elastic sheet has an initial state in which it abuts against the first step. When the load on the column increases, the screw applies an increased downward force to the elastic sheet, causing it to deform downwards and contact the second and third steps as the load increases. When the elastic sheet contacts the first step and bends downwards, it deforms within the first deformation space. When the elastic sheet contacts the second step and bends downwards, it deforms within the second deformation space. When the elastic sheet contacts the third step, it deforms within the third deformation space.

4. The obstacle detection column adaptable to a wider load range according to claim 3, characterized in that: The first, second, and third steps are all circular, distributed from the outside in, with their heights decreasing sequentially.

5. The obstacle detection column adaptable to a wider load range according to claim 3, characterized in that: The step portion has a hole at its center to form a first clearance hole, and the elastic sheet has a hole at its center to form a second clearance hole; the screw passes through the first clearance hole and the second clearance hole and is then connected to the motor box.

6. The obstacle detection column adapted to a wider load range according to claim 5, characterized in that: The screw has a head that abuts against an elastic sheet.

7. The obstacle detection column adapted to a wider load range according to claim 5, characterized in that: The diameter of the second clearance hole on the elastic sheet is smaller than the diameter of the first clearance hole on the stepped portion.

8. The obstacle detection column adapted to a wider load range according to claim 5, characterized in that: The connector is installed inside the motor box; the motor box is provided with an upwardly protruding connector, which is located in the first clearance hole.

9. The obstacle detection column adaptable to a wider load range according to claim 1, characterized in that: The sensing element is in the shape of a ring; or, the sensing element is in the shape of a circle, and the sensing element is located next to the screw.

10. The obstacle detection column adaptable to a wider load range according to claim 1, characterized in that: The connector extends downward to form a mounting portion, and a bearing is installed in the mounting portion; the telescopic support assembly also includes a lead screw, and the bearing is disposed at the upper end of the lead screw and is tightly connected to the lead screw.

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