Sensor-based outdoor leisure table and chair stability detection device

Abstract

The invention relates to the technical field of stability detection of tables and chairs, in particular to a sensor-based stability detection device for outdoor leisure tables and chairs, which comprises a simulation part and a control part, the simulation part is used for simulating an outdoor environment, the control part comprises a data acquisition module used for acquiring data of the table and chair in a testing process, and the sinking depth of the table and chair is determined according to the data acquired by the data acquisition module so as to determine a standard gravity center deviation angle of the table and chair based on the sinking depth; the data analysis module is used for determining whether the stability of the table and the chair is qualified or not based on the actual deviation angle and the vibration acceleration; the area division module is used for dividing the bearing surface of the table and the chair into two areas according to the gravity center of the table and the actual deviation angle; and the correction module is used for determining an adjustment coefficient of an angle correction coefficient according to the wind direction and the deviation direction of the actual deviation angle. The table and chair stability detection precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of stability detection of tables and chairs, and in particular to a sensor-based stability detection device for outdoor leisure tables and chairs. Background Art

[0002] As common facilities for outdoor activities, the stability of outdoor leisure tables and chairs is directly related to the safety and comfort of users. However, the outdoor environment is complex and changeable, including sun, rain, high and low temperatures, wind, and other factors, all of which can affect the stability of outdoor leisure tables and chairs. Existing stability testing of tables and chairs still focuses on static load testing and lacks the requirements for dynamic environmental simulation. With the frequent occurrence of extreme weather and the complexity of user scenarios, the existing testing system can no longer meet the needs of the emerging market.

[0003] Chinese Patent Publication No.: CN117538087A discloses a stability testing device for wooden tables and chairs, comprising: a connecting base, on which are mounted support platforms symmetrically arranged along the width direction thereof, the support platforms being L-shaped, the horizontal sections of the two support platforms both being provided with placement grooves, and a testing mechanism being provided on the top of the connecting base. The stability testing device for wooden tables and chairs designed by the present invention converts the straight push group and the top push group through a conversion adjustment group, simulating the reciprocating movement of a table in different states, and the testing mechanism cooperates with the gravity simulation mechanism to realize comprehensive simulation tests of the table's translation in a horizontal state, the table's translation in a state in which one side is raised, and the translation of the upper end of a horizontal table with or without a load. Through multi-directional testing, the comprehensiveness of the table stability test is improved.

[0004] The following problems also exist in the prior art: the stability detection of tables and chairs in the prior art is still carried out under static load conditions, and lacks detection in a dynamic environment, resulting in low accuracy in the stability detection of tables and chairs. Summary of the Invention

[0005] To this end, the present invention provides a sensor-based stability detection device for outdoor leisure tables and chairs to overcome the defect of the prior art that lacks detection in dynamic environments, thereby resulting in low accuracy in stability detection of tables and chairs.

[0006] To achieve the above objectives, the present invention provides a sensor-based stability detection device for outdoor leisure tables and chairs, comprising: The simulation part includes a plurality of loading platforms for simulating outdoor geology and a plurality of fans arranged on the inner wall of the simulation part for simulating outdoor wind; A control unit connected to the simulation unit includes: The data acquisition module includes a pressure sensor array for collecting the pressure of each support leg of the table and chair, a displacement sensor array for collecting the sinking distance of each support leg of the table and chair, a center of gravity sensor for collecting the center of gravity of the table and chair, an anemometer for collecting wind speed and direction, and an acceleration sensor for collecting the vibration acceleration of the table and chair; a data analysis module, configured to determine a sinking depth of the table and chair based on the data collected by the displacement sensor array, thereby determining a standard center of gravity offset angle of the table and chair based on the sinking depth, and to determine an actual offset angle of the center of gravity of the table and chair based on the data collected by the center of gravity sensor, thereby determining whether the stability of the table and chair is qualified based on the actual offset angle and the vibration acceleration; an area division module, which is used to divide the load-bearing surface of the table and chair into a first area and a second area according to the center of gravity of the table and chair and the actual offset angle; A correction module is used to determine an angle correction coefficient of the standard center of gravity offset angle according to the absolute pressure difference between the first area and the second area, and to determine an adjustment coefficient of the angle correction coefficient according to the wind direction and the offset direction of the actual offset angle.

[0007] Furthermore, the data analysis module determines that the standard center of gravity offset angle of the table and chair is a first offset angle based on the comparison result that the sinking depth is greater than the preset depth; The data analysis module determines that the standard center of gravity offset angle of the table and chair is a second offset angle based on the comparison result that the sinking depth is equal to the preset depth.

[0008] Furthermore, the data analysis module determines the angle between the ideal center of gravity and the lines connecting the center of gravity of the tables and chairs and the intersection of the centers of gravity as the actual offset angle, wherein the intersection of the centers of gravity is the intersection of the line segment and the load-bearing surface, and the line segment is a line segment formed by vertically extending from the ideal center of gravity as the endpoint to the load-bearing surface of the tables and chairs, and the ideal center of gravity is the center of gravity position that meets the design requirements of the tables and chairs.

[0009] Furthermore, the data analysis module determines that the stability of the table and chair is unqualified based on the comparison result that the actual offset angle is greater than the standard center of gravity offset angle.

[0010] Furthermore, the data analysis module determines that the stability of the table and chair is unqualified based on a comparison result that the actual offset angle is less than or equal to the standard center of gravity offset angle and the vibration acceleration is greater than a preset acceleration.

[0011] Furthermore, the data analysis module determines that the stability of the table and chair is qualified based on a comparison result that the actual offset angle is less than or equal to the standard center of gravity offset angle and the vibration acceleration is less than or equal to the preset acceleration.

[0012] Furthermore, the area division module determines the vertical plane passing through the center of gravity of the table and chair and corresponding to the cosine value of the actual offset angle as the area division reference plane, and divides the load-bearing surface of the table and chair into a first area and a second area using the intersection of the area division reference plane and the load-bearing surface of the table and chair as the dividing line, and determines a number of supporting legs in the first area and the second area respectively.

[0013] Furthermore, the correction module determines to correct the standard center of gravity offset angle with a first angle correction coefficient based on a comparison result that an absolute pressure difference between the first pressure average value and the second pressure average value is greater than a preset pressure difference; Determining to correct the standard center of gravity offset angle using a second angle correction coefficient based on a comparison result that the absolute pressure difference is less than or equal to the preset pressure difference; The first average pressure value is the average pressure value of the supporting legs in the first area, and the second average pressure value is the average pressure value of the supporting legs in the second area.

[0014] Furthermore, the correction module determines to adjust the angle correction coefficient by a first adjustment coefficient based on a comparison result that the wind speed is less than or equal to a first preset wind speed, under the condition that the direction deviation between the wind direction and the actual offset angle is less than a preset deviation; Based on the comparison result that the wind speed is greater than the first preset wind speed, it is determined to adjust the angle correction coefficient by a second adjustment coefficient.

[0015] Furthermore, the correction module determines to adjust the angle correction coefficient by a third adjustment coefficient based on a comparison result that the wind speed is less than or equal to a second preset wind speed, under the condition that the direction deviation between the wind direction and the actual offset angle is greater than the preset deviation; Based on the comparison result that the wind speed is greater than the second preset wind speed, it is determined to adjust the angle correction coefficient with a fourth adjustment coefficient.

[0016] Compared with the prior art, the beneficial effect of the present invention lies in that the present invention simulates outdoor terrain through the carrying platform of the simulation part, simulates wind force through the fan, and uses a sphere to simulate load in a dynamic environment. The stability of the tables and chairs is comprehensively evaluated according to the actual offset angle of the center of gravity of the tables and chairs in the dynamic environment and the vibration acceleration of the tables and chairs, thereby making the stability detection of the tables and chairs more in line with actual usage conditions and further improving the detection accuracy of the stability of the tables and chairs.

[0017] Furthermore, the present invention determines the standard center of gravity offset angle according to the sinking depth. The best stability of tables and chairs should be that the ideal center of gravity is consistent with the center of gravity of the tables and chairs during use. However, it is difficult to maintain consistency in actual use. There is an offset angle. The larger the offset angle, the worse the stability of the tables and chairs, and the greater the possibility of tipping over. Using the same tables and chairs under different geological conditions will cause different results with the same offset angle. Therefore, the standard center of gravity offset angle allowed while ensuring that the tables and chairs do not tip over is also different. Soft soil has higher requirements for the offset angle. The geological conditions are divided into soft soil and hard soil according to the sinking depth and different standards are set, thereby further improving the detection accuracy of the stability of tables and chairs.

[0018] Furthermore, the present invention combines the actual offset angle and vibration acceleration to evaluate the stability of tables and chairs. The vibration acceleration indicates the anti-disturbance ability of the tables and chairs when subjected to external forces. The smaller the vibration acceleration, the stronger the anti-disturbance ability of the tables and chairs. The actual offset angle indicates the possibility of the tables and chairs tipping over. Taking the vibration acceleration into consideration while ensuring that they do not tip over can improve the detection accuracy of the stability of the tables and chairs, thereby further improving the detection accuracy of the stability of the tables and chairs.

[0019] Furthermore, the present invention detects the pressure conditions of each supporting leg through a pressure sensor array. If the tables and chairs are completely horizontal and the ground is completely flat, then the forces acting on all the supporting legs are equal. However, in actual situations, factors such as the horizontality of the tables and chairs, the flatness of the ground, and uneven loads may all cause different forces acting on the supporting legs. The load-bearing surface is divided into two areas by the actual offset angle, and the pressure of each supporting leg in the two areas is further analyzed to determine the degree of uneven force on the tables and chairs. The higher the degree of unevenness, the smaller the standard center of gravity offset angle. The standard center of gravity offset angle is accurately corrected according to the absolute pressure difference, thereby further improving the detection accuracy of the stability of the tables and chairs.

[0020] Furthermore, the present invention adjusts the angle correction coefficient by detecting wind direction and wind speed. When the directional deviation between the wind direction and the actual offset angle is less than 90°, the possibility of the tables and chairs tipping over will increase. When the directional deviation between the wind direction and the actual offset angle is less than 90°, the possibility of the tables and chairs tipping over will be reduced. The angle correction coefficient is adjusted according to the wind direction to achieve accurate correction of the standard center of gravity offset angle, thereby further improving the detection accuracy of the stability of tables and chairs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a sensor-based stability detection device for outdoor leisure tables and chairs according to an embodiment of the present invention; Figure 2 This is a structural block diagram of a sensor-based stability detection device for outdoor leisure tables and chairs according to an embodiment of the present invention; Figure 3 A flow chart for determining a standard center of gravity offset angle according to an embodiment of the present invention; Figure 4 A flow chart showing whether the stability of a table and chair is qualified according to an embodiment of the present invention; Figure numerals: 1. loading platform, 2. fan, 3. sphere. DETAILED DESCRIPTION

[0022] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0023] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0024] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0025] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0026] See also Figure 1-4 As shown, Figure 1 This is a schematic structural diagram of a sensor-based stability detection device for outdoor leisure tables and chairs according to an embodiment of the present invention; Figure 2 This is a structural block diagram of a sensor-based stability detection device for outdoor leisure tables and chairs according to an embodiment of the present invention; Figure 3 A flow chart for determining a standard center of gravity offset angle according to an embodiment of the present invention; Figure 4 This is a flow chart for determining whether the stability of tables and chairs is qualified according to an embodiment of the present invention.

[0027] An embodiment of the present invention provides a sensor-based stability detection device for outdoor leisure tables and chairs, comprising: The simulation part includes several loading platforms for simulating outdoor geology, several fans installed on the inner wall of the simulation part for simulating outdoor wind, and several spheres installed on the top of the simulation part for applying pressure to tables and chairs; A control unit connected to the simulation unit includes: The data acquisition module includes a pressure sensor array for collecting the pressure of each support leg of the table and chair, a displacement sensor array for collecting the sinking distance of each support leg of the table and chair, a center of gravity sensor for collecting the center of gravity of the table and chair, an anemometer for collecting wind speed and direction, and an acceleration sensor for collecting the vibration acceleration of the table and chair; a data analysis module, configured to determine a sinking depth of the table and chair based on the data collected by the displacement sensor array, thereby determining a standard center of gravity offset angle of the table and chair based on the sinking depth, and to determine an actual offset angle of the center of gravity of the table and chair based on the data collected by the center of gravity sensor, thereby determining whether the stability of the table and chair is qualified based on the actual offset angle and the vibration acceleration; an area division module, which is used to divide the load-bearing surface of the table and chair into a first area and a second area according to the center of gravity of the table and chair and the actual offset angle; A correction module is used to determine an angle correction coefficient of the standard center of gravity offset angle according to the absolute pressure difference between the first area and the second area, and to determine an adjustment coefficient of the angle correction coefficient according to the wind direction and the offset direction of the actual offset angle.

[0028] Specifically, the loading platform is composed of several parts, each of which simulates real outdoor terrain, such as land, concrete, and marble. The terrain simulated by each part is different, and the number and type of terrain are not limited and can be selected according to needs.

[0029] Specifically, the fans are arranged on the inner walls around the simulation part, which can simulate the outdoor wind direction and wind speed. The wind direction and wind speed are selected according to the design requirements of the tables and chairs, and the stability of the tables and chairs is determined under different wind conditions.

[0030] Specifically, the sphere is connected to the top of the simulation part by a retractable connecting rod to simulate the load condition. The connecting rod can be controlled to extend to different lengths according to the test requirements to apply different forces, and the sphere can be placed at different positions on the table and chair to simulate the situation where loads of different weights are placed at different positions on the table and chair, thereby accurately determining the stability of the table and chair.

[0031] Specifically, the pressure sensor array and the displacement sensor array are both patch-type sensors, which can be attached to the supporting legs of tables and chairs to simultaneously collect the pressure and sinking distance of each supporting leg. The specific model and quantity are not limited; the center of gravity sensor is set at the bottom of the support surface of the tables and chairs, and can obtain the center of gravity of the tables and chairs in real time.

[0032] It can be understood that the center of gravity of an object is the point of application of the gravity acting on the object, that is, the point of application of the resultant force of gravity acting on all parts of the object. For objects with uniform force, the center of gravity is usually located on the vertical line where its ideal center of gravity is located, depending on the magnitude of the force. The ideal center of gravity of empty tables and chairs should be located at the center of their load-bearing surface or slightly below it. As the force changes, the position of the ideal center of gravity will change, but it is always on the vertical line where the ideal center of gravity of empty tables and chairs is located. Under the condition that the tables and chairs are subjected to uniform force, the actual center of gravity of the tables and chairs coincides with the ideal center of gravity, which is the most stable state. However, in actual use, it is difficult for the tables and chairs to maintain uniform force, so the actual center of gravity will shift. The larger the offset angle, the easier it is for the tables and chairs to tip over, and the worse the stability.

[0033] Specifically, the wind direction and speed meter, such as an ultrasonic wind speed and direction meter, can simultaneously collect wind direction and wind speed, and the specific model is not limited; the acceleration sensor, such as Kistler's 8726 series acceleration sensor, can collect the acceleration generated by the vibration of tables and chairs, and the specific model is not limited. It can be understood that the greater the vibration acceleration, the worse the anti-disturbance ability of the tables and chairs when subjected to external forces, and the worse the stability.

[0034] Specifically, the sinking depth of the table and chair is the average sinking distance of all supporting legs; the standard center of gravity offset angle is the maximum offset angle at which the table and chair remain stable when the actual center of gravity deviates from the ideal center of gravity.

[0035] Specifically, the data analysis module determines that the standard center of gravity offset angle of the table and chair is a first offset angle based on the comparison result that the sinking depth is greater than the preset depth; The data analysis module determines that the standard center of gravity offset angle of the table and chair is a second offset angle based on the comparison result that the sinking depth is equal to the preset depth.

[0036] Specifically, the preset depth is set to 0 in order to distinguish between soft and hard floors. Tables and chairs are more likely to tip over on soft floors because the supporting legs sink, and the standard center of gravity offset angle is smaller. Therefore, the standard center of gravity offset angle can be determined based on whether the supporting legs sink under stress.

[0037] Specifically, the first offset angle and the second offset angle are determined according to the design requirements of the tables and chairs. For example, if the offset angle is determined to be 15° in the design requirements of the tables and chairs, the first offset angle can be set to 10° and the second offset angle can be set to 13°.

[0038] Specifically, the data analysis module determines the angle between the ideal center of gravity and the lines connecting the center of gravity of the tables and chairs and the intersection of the centers of gravity as the actual offset angle, wherein the intersection of the centers of gravity is the intersection of the line segment and the load-bearing surface, and the line segment is a line segment formed by vertically extending from the ideal center of gravity as the endpoint to the load-bearing surface of the tables and chairs, and the ideal center of gravity is the center of gravity position that meets the design requirements of the tables and chairs.

[0039] Specifically, the data analysis module determines that the stability of the table and chair is unqualified based on the comparison result that the actual offset angle is greater than the standard center of gravity offset angle.

[0040] Specifically, the data analysis module determines that the stability of the table and chair is unqualified based on a comparison result that the actual offset angle is less than or equal to the standard center of gravity offset angle and the vibration acceleration is greater than a preset acceleration.

[0041] Specifically, the data analysis module determines that the stability of the table and chair is qualified based on the comparison result that the actual offset angle is less than or equal to the standard center of gravity offset angle and the vibration acceleration is less than or equal to the preset acceleration.

[0042] Specifically, the preset acceleration value range is set to [1m / s², 1.5m / s²], and 1.2m / s² is preferred in the embodiment of the present invention.

[0043] Specifically, the area division module determines the vertical plane passing through the center of gravity of the table and chair and corresponding to the cosine value of the actual offset angle as the area division reference plane, and divides the load-bearing surface of the table and chair into a first area and a second area using the intersection of the area division reference plane and the load-bearing surface of the table and chair as the dividing line, and determines a number of supporting legs in the first area and the second area respectively.

[0044] Specifically, the correction module determines to correct the standard center of gravity offset angle by a first angle correction coefficient based on a comparison result that the absolute pressure difference between the first pressure average value and the second pressure average value is greater than a preset pressure difference; Determining to correct the standard center of gravity offset angle using a second angle correction coefficient based on a comparison result that the absolute pressure difference is less than or equal to the preset pressure difference; The first average pressure value is the average pressure value of the supporting legs in the first area, and the second average pressure value is the average pressure value of the supporting legs in the second area.

[0045] Specifically, the absolute pressure difference is the absolute value of the difference between the first pressure average value and the second pressure average value; the value range of the preset pressure difference is set to [5N, 30N], and 10N is preferably used in the embodiment of the present invention.

[0046] Specifically, the value range of the first angle correction coefficient is set to [0.7, 0.8], and the embodiment of the present invention preferably is 0.75; the value range of the second angle correction coefficient is set to [0.81, 0.9], and the embodiment of the present invention preferably is 0.85.

[0047] It can be understood that the angle correction coefficient corrects the standard center of gravity offset angle in the following way: the product of the angle correction coefficient and the standard center of gravity offset angle before correction is the corrected standard center of gravity offset angle. For example, the first angle correction coefficient of 0.75 is used to correct the first offset angle of 10°, and the product is 7.5°, that is, the corrected first offset angle is 7.5°.

[0048] Specifically, the correction module determines to adjust the angle correction coefficient by a first adjustment coefficient based on a comparison result that the wind speed is less than or equal to a first preset wind speed, under the condition that the direction deviation between the wind direction and the actual offset angle is less than a preset deviation; Based on the comparison result that the wind speed is greater than the first preset wind speed, it is determined to adjust the angle correction coefficient by a second adjustment coefficient.

[0049] Specifically, the preset deviation is 90°. When the deviation between the wind direction and the actual offset angle is less than 90°, the wind direction will increase the possibility of the tables and chairs tipping over. The value range of the first preset wind speed is set to [8m / s, 14m / s], and the embodiment of the present invention preferably prefers 10m / s; the value range of the first adjustment coefficient is set to [0.9, 0.99], and the embodiment of the present invention preferably prefers 0.92; the value range of the second adjustment coefficient is set to [0.8, 0.89], and the embodiment of the present invention preferably prefers 0.83.

[0050] Specifically, the correction module determines to adjust the angle correction coefficient by a third adjustment coefficient based on a comparison result that the wind speed is less than or equal to a second preset wind speed, under the condition that the direction deviation between the wind direction and the actual offset angle is greater than the preset deviation; Based on the comparison result that the wind speed is greater than the second preset wind speed, it is determined to adjust the angle correction coefficient with a fourth adjustment coefficient.

[0051] Specifically, the value range of the second preset wind speed is set to [9m / s, 18m / s], and the preferred embodiment of the present invention is 13m / s; the value range of the third adjustment coefficient is set to [1.01, 1, 1], and the preferred embodiment of the present invention is 1.08; the value range of the fourth adjustment coefficient is set to [1.11, 1.2], and the preferred embodiment of the present invention is 1.15.

[0052] It is understandable that when the deviation between the wind direction and the actual offset angle is greater than 90°, the wind direction will reduce the possibility of the table and chairs tipping over.

[0053] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A sensor-based stability detection device for outdoor leisure tables and chairs, characterized in that: include: The simulation part includes a plurality of loading platforms for simulating outdoor geology and a plurality of fans arranged on the inner wall of the simulation part for simulating outdoor wind; a control unit connected to the simulation unit, include, The data acquisition module includes a pressure sensor array for collecting the pressure of each support leg of the table and chair, a displacement sensor array for collecting the sinking distance of each support leg of the table and chair, a center of gravity sensor for collecting the center of gravity of the table and chair, an anemometer for collecting wind speed and direction, and an acceleration sensor for collecting the vibration acceleration of the table and chair; a data analysis module, configured to determine a sinking depth of the table and chair based on the data collected by the displacement sensor array, thereby determining a standard center of gravity offset angle of the table and chair based on the sinking depth, and to determine an actual offset angle of the center of gravity of the table and chair based on the data collected by the center of gravity sensor, thereby determining whether the stability of the table and chair is qualified based on the actual offset angle and the vibration acceleration; an area division module, which is used to divide the load-bearing surface of the table and chair into a first area and a second area according to the center of gravity of the table and chair and the actual offset angle; A correction module is used to determine an angle correction coefficient of the standard center of gravity offset angle according to the absolute pressure difference between the first area and the second area, and to determine an adjustment coefficient of the angle correction coefficient according to the wind direction and the offset direction of the actual offset angle.

2. The sensor-based stability detection device for outdoor leisure tables and chairs according to claim 1 is characterized in that: The data analysis module determines that the standard center of gravity offset angle of the table and chair is a first offset angle based on the comparison result that the sinking depth is greater than the preset depth; The data analysis module determines that the standard center of gravity offset angle of the table and chair is a second offset angle based on the comparison result that the sinking depth is equal to the preset depth.

3. The sensor-based stability detection device for outdoor leisure tables and chairs according to claim 2, characterized in that: The data analysis module determines the angle between the ideal center of gravity and the lines connecting the center of gravity of the tables and chairs and the intersection of the centers of gravity as the actual offset angle, wherein the intersection of the centers of gravity is the intersection of the line segment and the load-bearing surface, and the line segment is a line segment formed by vertically extending from the ideal center of gravity as the endpoint to the load-bearing surface of the tables and chairs, and the ideal center of gravity is the center of gravity position that meets the design requirements of the tables and chairs.

4. The sensor-based stability detection device for outdoor leisure tables and chairs according to claim 3 is characterized in that: The data analysis module determines that the stability of the table and chair is unqualified based on a comparison result that the actual offset angle is greater than the standard center of gravity offset angle.

5. The sensor-based stability detection device for outdoor leisure tables and chairs according to claim 3 is characterized in that: The data analysis module determines that the stability of the table and chair is unqualified based on a comparison result that the actual offset angle is less than or equal to the standard center of gravity offset angle and the vibration acceleration is greater than a preset acceleration.

6. The sensor-based stability detection device for outdoor leisure tables and chairs according to claim 3, characterized in that: The data analysis module determines that the stability of the table and chair is qualified based on a comparison result that the actual offset angle is less than or equal to the standard center of gravity offset angle and the vibration acceleration is less than or equal to the preset acceleration.

7. The sensor-based stability detection device for outdoor leisure tables and chairs according to claim 6, characterized in that: The area division module determines the vertical plane passing through the center of gravity of the table and chair and corresponding to the cosine value of the actual offset angle as the area division reference plane, divides the load-bearing surface of the table and chair into a first area and a second area using the intersection of the area division reference plane and the load-bearing surface of the table and chair as the dividing line, and determines a number of supporting legs in the first area and the second area respectively.

8. The sensor-based stability detection device for outdoor leisure tables and chairs according to claim 7, characterized in that: The correction module determines to correct the standard center of gravity offset angle by a first angle correction coefficient based on a comparison result that the absolute pressure difference between the first pressure average value and the second pressure average value is greater than a preset pressure difference; Determining to correct the standard center of gravity offset angle using a second angle correction coefficient based on a comparison result that the absolute pressure difference is less than or equal to the preset pressure difference; The first average pressure value is the average pressure value of the supporting legs in the first area, and the second average pressure value is the average pressure value of the supporting legs in the second area.

9. The sensor-based stability detection device for outdoor leisure tables and chairs according to claim 8, characterized in that: The correction module determines, under the condition that the direction deviation between the wind direction and the actual offset angle is less than the preset deviation, to adjust the angle correction coefficient by a first adjustment coefficient based on a comparison result that the wind speed is less than or equal to a first preset wind speed; Based on the comparison result that the wind speed is greater than the first preset wind speed, it is determined to adjust the angle correction coefficient by a second adjustment coefficient.

10. The sensor-based stability detection device for outdoor leisure tables and chairs according to claim 8, characterized in that: The correction module determines, under the condition that the direction deviation between the wind direction and the actual offset angle is greater than the preset deviation, to adjust the angle correction coefficient by a third adjustment coefficient based on a comparison result that the wind speed is less than or equal to a second preset wind speed; Based on the comparison result that the wind speed is greater than the second preset wind speed, it is determined to adjust the angle correction coefficient with a fourth adjustment coefficient.

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