Strength detection device for outdoor leisure table and chair

Abstract

The invention relates to the technical field of furniture manufacturing, in particular to an outdoor leisure table and chair strength detection device which comprises a detection table, a hydraulic cylinder, a lower pressing plate and a fixing part comprising a first detection plate, a second detection plate, a nut and a lead screw. The sample processing module is used for determining initial data of the sample according to the diameter of the support frame; comprising a displacement sensor, an acceleration sensor and a strain gauge; the adjusting module is used for adjusting the initial value under the condition that the initial static load value setting is not up to the standard according to the pressing displacement; under the condition that the static strength of the sample is determined to be substandard according to the rotating resistance change rate of the connecting shaft, the thickness of a supporting rod of the sample is determined to be substandard or the diameter of the connecting shaft is determined to be substandard according to the bending degree of the connecting shaft; and the control module is used for determining the cause of substandard conditions under the condition that the dynamic strength of the sample is judged to be substandard according to the vibration evaluation value of the connecting shaft, so that the strength detection accuracy is improved.

Description

Technical Field

[0001] The invention relates to the technical field of furniture manufacturing, and in particular to a strength detection device for outdoor leisure tables and chairs. Background Art

[0002] Outdoor leisure tables and chairs are a common type of outdoor furniture, generally made of aluminum alloy. Among them, X-shaped folding outdoor leisure tables and chairs are widely used due to their unique X-shaped support structure, good stability, strong portability and other characteristics.

[0003] Strength testing of outdoor leisure tables and chairs is extremely important. Strength testing can ensure that outdoor leisure tables and chairs can withstand the expected load during use and will not have problems such as structural damage. Among them, static strength testing and dynamic strength testing are important links in evaluating their quality and safety; static strength testing mainly evaluates the load-bearing capacity and structural stability of outdoor leisure tables and chairs in a static state, and dynamic strength testing simulates the dynamic load conditions of outdoor leisure tables and chairs in actual use, and evaluates their durability and fatigue resistance. Through strength testing, the quality and safety of outdoor leisure tables and chairs can be ensured to meet the needs of consumers.

[0004] Chinese Patent Publication No.: CN111896281A discloses a strength detection device for leisure tables and chairs, comprising a bottom plate, a leg fixing assembly is installed on the upper part of the bottom plate, a support plate is slidably installed on one side of the bottom plate, a left electric cylinder and a right electric cylinder are respectively installed on both sides of the support plate, the left electric cylinder and the right electric cylinder are respectively fixedly connected to the bottom plate, a working plate is slidably installed on the side of the support plate, four corners of the working plate are all installed with clamping assemblies, a lifting assembly is installed on the upper part of the support plate, and the lifting assembly is transmission-connected with the working plate; the present invention performs tensile strength detection on tables and chairs by arranging a lifting assembly, arranging a left electric cylinder and a right electric cylinder to provide a left and right swinging force for the support plate, so that the tables and chairs can withstand the left and right swinging force while bearing the tensile force, simulating the use environment of the tables and chairs, performing multi-directional detection on the tables and chairs, and improving the factory quality assurance of the tables and chairs.

[0005] It can be seen that the above technical solution does not consider the impact of dynamic loads on the quality of tables and chairs and does not consider the impact of static loads on the load-bearing capacity of tables and chairs, which leads to the problem of poor strength detection accuracy and low detection efficiency in the strength detection of outdoor leisure tables and chairs. Summary of the invention

[0006] To this end, the present invention provides a strength detection device for outdoor leisure tables and chairs, which is used to overcome the problem that the prior art does not consider the influence of dynamic loads on the quality of tables and chairs and does not consider the influence of static loads on the bearing capacity of tables and chairs, thereby resulting in poor strength detection accuracy and low detection efficiency in the strength detection of outdoor leisure tables and chairs.

[0007] To achieve the above object, the present invention provides a strength detection device for outdoor leisure tables and chairs, comprising: The hollow testing platform is penetrated by a pair of hydraulic cylinders arranged above the testing platform and a lower pressing plate connected to the hydraulic cylinders; A fixing part, which is arranged at the bottom of the detection platform, comprises a first detection plate, a second detection plate, a nut and a lead screw, wherein the first detection plate is fixedly arranged at one side of the detection platform, the second detection plate is arranged opposite to the first detection plate, nuts are symmetrically arranged at the bottom of both sides of the second detection plate, the lead screw is arranged inside the detection platform, and the lead screw drives the second detection plate to move by rotating through the sleeved nut; The specimen comprises a first support group and a second support group which are symmetrically arranged, wherein the first support group and the second support group are connected by a connecting shaft which horizontally passes through the connecting hole, and the first support group is composed of cross-arranged support rods; A data acquisition module, comprising a displacement sensor arranged on the top of the test platform, a visual sensor arranged on the side wall of the test platform, an acceleration sensor arranged on the sample connection shaft, a torque sensor arranged on the sample connection shaft, and a strain gauge arranged in the middle of the connection shaft, wherein the displacement sensor is arranged perpendicular to the upper surface of the sample, and the visual sensor is arranged along the axial direction of the connection hole; A sample processing module, which is connected to the data acquisition module and the hydraulic cylinder respectively, and is used to determine the initial data of the sample according to the support frame diameter obtained by the visual sensor, wherein the initial data includes the initial support rod length and the initial static load value; A control module is connected to the data acquisition module and the hydraulic cylinder respectively, and is used to increase the initial static load value when the initial static load value does not meet the standard according to the downward displacement, or to determine the adjustment strategy; when the static strength of the sample does not meet the standard according to the rate of change of the rotational resistance of the connecting shaft, the reason for the static strength not meeting the standard is determined according to the curvature of the connecting shaft; and when the dynamic strength of the sample meets the standard according to the vibration evaluation value of the connecting shaft, the control module is used to increase the initial static load value when the initial static load value does not meet the standard according to the downward displacement; or to determine the adjustment strategy; when the static strength of the sample does not meet the standard according to the rate of change of the rotational resistance of the connecting shaft, the reason for the static strength not meeting the standard is determined according to the curvature of the connecting shaft; and

[0008] Furthermore, in response to the downward displacement being greater than or equal to a first preset downward displacement and less than a second preset downward displacement, the control module determines that the setting of the initial static load value meets a preset standard and performs a static strength test on the sample.

[0009] Further, the control module increases the initial static load value under the condition that the comparison result of the downward displacement is less than the first preset downward displacement value and determines that the setting of the initial static load value does not meet the preset standard, and the control module determines that the setting of the initial static load value does not meet the preset standard according to the area deformation rate of the connecting hole under the condition that the downward displacement is greater than or equal to the second preset downward displacement value. The adjustment strategy; the downward displacement is the vertical distance between the upper surface of the sample before the static strength test and the upper surface of the sample after the static strength test.

[0010] Furthermore, the control module determines, according to the area deformation value of the connection hole, an adjustment strategy under the condition that the setting of the initial static load value does not meet the preset standard, including: Under the condition that the area deformation rate is less than the preset area deformation rate, reducing the initial support rod length of the sample; or, under the condition that the area deformation rate is greater than or equal to the preset area deformation rate, reducing the initial static load value; The area deformation rate of the connection hole is the ratio between the area of ​​the connection hole after the static strength test and the area of ​​the connection hole before the static strength test.

[0011] Further, the control module determines that the static strength of the sample meets the preset standard according to the comparison result that the rotation resistance change rate of the connecting shaft is less than the preset rotation resistance change rate, and performs a dynamic strength test on the sample; The rotational resistance change rate of the connecting shaft is determined by the rotational resistance value of the connecting shaft after the static strength test of the sample and the rotational resistance value of the connecting shaft before the static strength test of the sample.

[0012] Furthermore, the control module determines the reason why the static strength of the sample does not meet the preset standard according to the curvature of the connecting shaft under the condition that the static strength of the sample does not meet the preset standard.

[0013] Furthermore, the control module determines the reason why the static strength of the sample does not meet the preset standard according to the curvature of the connecting shaft, wherein: If the curvature is less than the preset curvature, the control module determines that the reason why the static strength of the sample does not meet the preset standard is that the thickness of the support rod of the sample does not meet the standard; If the curvature is greater than or equal to the preset curvature, the control module determines that the reason why the static strength of the sample does not meet the preset standard is that the diameter of the connecting shaft does not meet the standard; the curvature of the connecting shaft is obtained by a strain gauge.

[0014] Furthermore, the control module determines that the dynamic strength test of the sample meets the preset standard based on the comparison result that the vibration evaluation value of the connecting shaft is less than the first preset vibration threshold.

[0015] Furthermore, the control module determines the reason why the dynamic strength test of the sample does not meet the preset standard according to the vibration evaluation value of the connecting shaft, including: If the vibration evaluation value is greater than or equal to the first preset vibration threshold and less than the second preset vibration threshold, the reason is that the assembly clearance between the connecting hole and the connecting shaft does not meet the standard; If the vibration evaluation value is greater than or equal to the second preset vibration threshold, the reason is that the stiffness of the connecting shaft does not meet the standard.

[0016] Further, the vibration evaluation value of the connecting shaft is a ratio between the vibration amplitude of the connecting shaft obtained by the acceleration sensor and a preset vibration amplitude.

[0017] Compared with the prior art, the beneficial effect of the present invention lies in that, the present invention forms a stable detection space by providing a first detection plate and a second detection plate, thereby ensuring that the sample will not deviate or shake during the detection process, thereby improving the accuracy of the detection; through the cooperation of the lead screw and the nut, the position of the second detection plate can be adjusted according to the size of the sample; the hydraulic cylinder provides a stable downward force, and the downward pressure plate evenly transfers the pressure to the sample, and by adjusting the working mode of the hydraulic cylinder, static strength testing or dynamic strength testing is performed to evaluate the fatigue resistance and durability of the tables and chairs, and sample data is collected through a variety of sensors, the rationality of the setting of the initial static load value is verified by the downward displacement and area deformation rate, and the static strength of the sample is verified and the cause is determined by the rotational resistance change rate and the curvature, thereby improving the detection efficiency; the dynamic strength of the sample is accurately evaluated by the vibration evaluation value, and the cause is determined when the dynamic strength does not meet the standard, providing a direction for improving the design, thereby improving the quality and efficiency of strength detection.

[0018] Furthermore, the present invention determines the setting of the initial static load value according to the downward displacement through the control module, and dynamically adjusts the initial static load value, thereby ensuring the rationality of the detection load.

[0019] Furthermore, the present invention sets a control module to determine the adjustment strategy when the setting of the initial static load value does not meet the preset standard according to the area deformation value of the connecting hole, thereby reducing the initial support rod length of the sample or reducing the initial static load value, thereby ensuring that the outdoor leisure tables and chairs can withstand the expected load in actual use, thereby improving the accuracy of strength testing.

[0020] Furthermore, the present invention sets a control module to determine whether the static strength of the sample meets the preset standard according to the rotational resistance change rate of the connecting shaft. The rotational resistance change rate of the connecting shaft is an important indicator reflecting the structural stability and load-bearing capacity of tables and chairs. By analyzing the rotational resistance change rate of the connecting shaft, it is possible to quickly determine whether the static strength of the sample meets the preset standard, thereby improving the detection efficiency.

[0021] Furthermore, the present invention improves the accuracy of strength testing by determining the reasons why the static strength of the sample does not meet the preset standards based on the curvature of the connecting shaft, including the thickness of the support rod not meeting the standards or the diameter of the connecting shaft not meeting the standards.

[0022] Furthermore, the present invention performs static strength testing on samples and tests the load-bearing capacity of tables and chairs by simulating static loads in actual use, thereby ensuring the structural stability of the product.

[0023] Furthermore, the present invention determines whether the dynamic strength test of the sample meets the preset standard according to the vibration evaluation value of the connecting shaft, and evaluates the performance of the outdoor leisure tables and chairs under dynamic loads through the vibration evaluation value of the connecting shaft, thereby improving the accuracy of the test.

[0024] Furthermore, the present invention performs dynamic strength tests on samples to simulate the dynamic loads of tables and chairs in actual use, evaluates the durability and fatigue resistance of tables and chairs, and truly simulates the actual use environment, thereby improving the reliability of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of a strength detection device for outdoor leisure tables and chairs according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of a sample of an embodiment of the present invention; Figure 3 This is a schematic diagram of module connections of a strength detection device for outdoor leisure tables and chairs according to an embodiment of the present invention; Figure 4 A flow chart of an embodiment of the present invention for determining whether the static strength of a sample meets a preset standard; Figure 5 For the embodiment of the present invention Figure 1 Side cross-sectional view along plane AA; In the figure: 1. test bench; 2. hydraulic cylinder; 3. lower pressure plate; 4. first test plate; 5. second test plate; 6. lead screw; 7. connecting shaft; 8. support rod; 9. nut. DETAILED DESCRIPTION

[0026] 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 only used to explain the present invention and are not used to limit the present invention.

[0027] 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 protection scope of the present invention.

[0028] It should be pointed out that the data in this embodiment are obtained by comprehensive analysis and evaluation of the historical test data of the present invention three months before this test and the corresponding historical test results. It can be understood by those skilled in the art that the method of the present invention can determine the above parameters for a single item by selecting the value with the highest proportion as the preset standard parameter according to the data distribution, using weighted summation to use the obtained value as the preset standard parameter, substituting each historical data into a specific formula and using the value obtained by the formula as the preset standard parameter or other selection methods, as long as the method of the present invention can clearly define the different specific situations in the single determination process through the obtained values.

[0029] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 as well as Figure 5 As shown, they are respectively a structural schematic diagram of the strength detection device for outdoor leisure tables and chairs according to an embodiment of the present invention; a structural schematic diagram of a sample according to an embodiment of the present invention; a module connection schematic diagram of the strength detection device for outdoor leisure tables and chairs according to an embodiment of the present invention; a flow chart of determining whether the static strength of a sample meets a preset standard according to an embodiment of the present invention; an embodiment of the present invention Figure 1 Side section view along plane AA.

[0030] The embodiment of the present invention provides a strength detection device for outdoor leisure tables and chairs, comprising: See also Figure 1 and Figure 5 As shown, a hollow testing platform: 1, a pair of hydraulic cylinders 2 arranged above the testing platform: 1, and a lower pressing plate 3 connected to the hydraulic cylinders 2; A fixing part, which is arranged at the bottom of the detection platform: 1, comprises a first detection plate 4, a second detection plate 5, a nut 9 and a lead screw 6, wherein the first detection plate 4 is fixedly arranged at one side of the detection platform: 1, the second detection plate 5 is arranged opposite to the first detection plate 4, nuts 9 are symmetrically arranged at the bottom of both sides of the second detection plate 5, and the lead screw 6 is arranged inside the detection platform: 1, and the lead screw 6 drives the second detection plate 5 to move by rotating through the sleeved nut 9; See also Figure 2 As shown, the specimen comprises a first support group and a second support group which are symmetrically arranged, the first support group and the second support group are connected by a connecting shaft 7 which passes horizontally through the connecting hole, and the first support group is composed of cross-arranged support rods 8; A data acquisition module, comprising a displacement sensor arranged on the top of the detection platform 1, a visual sensor arranged on the side wall of the detection platform 1, an acceleration sensor arranged on the sample connecting shaft 7, a torque sensor arranged on the sample connecting shaft 7, and a strain gauge arranged in the middle of the connecting shaft 7, wherein the displacement sensor is arranged perpendicular to the upper surface of the sample, and the visual sensor is arranged along the axial direction of the connecting hole; A sample processing module, which is connected to the data acquisition module and the hydraulic cylinder 2 respectively, and is used to determine the initial data of the sample according to the support frame diameter obtained by the visual sensor, wherein the initial data includes the initial support rod 8 length and the initial static load value; A control module is connected to the data acquisition module and the hydraulic cylinder 2 respectively, and is used to increase the initial static load value when the initial static load value does not meet the standard according to the downward displacement, or to determine the adjustment strategy; when the static strength of the sample does not meet the standard according to the rate of change of the rotational resistance of the connecting shaft 7, the reason for the static strength not meeting the standard is determined according to the curvature of the connecting shaft 7; and when the dynamic strength of the sample meets the standard according to the vibration evaluation value of the connecting shaft 7, the control module is used to increase the initial static load value when the initial static load value does not meet the standard according to the downward displacement; or to determine the adjustment strategy; when the static strength of the sample does not meet the standard according to the rate of change of the rotational resistance of the connecting shaft 7, the reason for the static strength not meeting the standard is determined according to the curvature of the connecting shaft 7; and

[0031] In this embodiment, the angle between the support rods 8 of the first support group of the sample is recorded as the expansion angle. In this embodiment, the initial expansion angle of the sample is set to 45 degrees, but the value is not limited to this. Technical personnel in this field can also adjust the value according to actual needs.

[0032] Specifically, there is no limitation on the specific structure of the sample processing module and the control module, and the sample processing module and the control module themselves and the units therein can be composed of logic components, and the logic components include field programmable components, computers or microprocessors in computers.

[0033] Specifically, the control module determines whether the setting of the initial static load value meets the preset standard according to the downward displacement, wherein: If the downward displacement is less than the first preset downward displacement of 5 mm, it is determined that the setting of the initial static load value does not meet the preset standard, and the initial static load value is increased according to the difference between the first preset downward displacement and the downward displacement; If the downward displacement is greater than or equal to the first preset downward displacement and less than the second preset downward displacement of 15 mm, it is determined that the setting of the initial static load value meets the preset standard, and the static strength test is performed on the sample; If the downward displacement is greater than or equal to the second preset downward displacement, it is determined that the setting of the initial static load value does not meet the preset standard, and an adjustment strategy is determined based on the area deformation rate of the connecting hole to determine whether the setting of the initial static load value does not meet the preset standard; The downward displacement is the vertical distance between the upper surface of the sample before the static strength test and the upper surface of the sample after the static strength test. The vertical displacement is obtained by a displacement sensor installed on the inner wall of the test table 1.

[0034] In this embodiment, the displacement sensor is a laser displacement sensor.

[0035] In this embodiment, the value of the first preset downward displacement amount and the value of the second preset downward displacement amount are both obtained through comprehensive analysis and evaluation of historical detection data before this detection and corresponding historical detection results.

[0036] Specifically, the control module determines, based on the area deformation value of the connection hole, that the setting of the initial static load value does not meet the adjustment strategy of the preset standard, wherein: If the area deformation rate is less than 10% of the preset area deformation rate, the control module reduces the initial support rod 8 length of the sample according to the difference between the preset area deformation rate and the area deformation rate; If the area deformation rate is greater than or equal to the preset area deformation rate, the control module reduces the initial static load value according to the difference between the area deformation rate and the preset area deformation rate; The area deformation rate of the connection hole is the ratio between the area of ​​the connection hole after the static strength test and the area of ​​the connection hole before the static strength test.

[0037] In this embodiment, the area deformation rate is used to evaluate the degree to which the shape or size of the connecting hole changes after being subjected to force; the preset area deformation rate value range is (5%, 15%), and preferably, 10% is selected to ensure that under normal use conditions, the structure of the outdoor leisure tables and chairs will not be damaged due to excessive deformation.

[0038] Specifically, the visual sensor is an industrial camera; before the static strength test, the industrial camera is used to capture the image of the connection hole before the static strength test; the industrial camera is used to capture the image of the connection hole after the static strength test, and the image processing technology is used to extract the contour. Finally, the image analysis software is used to obtain the area of ​​the connection hole after the static strength test. There is no specific limitation on the image processing technology and the image analysis software, and it is only necessary to meet the requirements for obtaining the area of ​​the connection hole.

[0039] See also Figure 4 Specifically, the control module determines whether the static strength of the sample meets the preset standard according to the change rate of the rotation resistance of the connecting shaft 7, wherein: If the rotational resistance change rate is less than the preset rotational resistance change rate of 11.8%, it is determined that the static strength of the sample meets the preset standard, and the dynamic strength test of the sample is performed; If the rotational resistance change rate is greater than or equal to the preset rotational resistance change rate, it is determined that the static strength of the sample does not meet the preset standard, and the reason why the static strength of the sample does not meet the preset standard is determined based on the curvature of the connecting shaft 7.

[0040] The rate of change of the rotational resistance of the connecting shaft is calculated by the following formula: Wherein, △R represents the rate of change of the rotational resistance of the connecting shaft 7; R0 represents the rotational resistance value of the connecting shaft 7 before the static strength test of the sample, and R1 represents the rotational resistance value of the connecting shaft 7 after the static strength test of the sample; The rotation resistance value of the connecting shaft 7 is obtained through a torque sensor.

[0041] Specifically, the preset rotational resistance change rate is obtained by analyzing a large amount of historical test data, which characterizes the overall structural strength of the outdoor leisure tables and chairs. In this embodiment, the preset rotational resistance change rate is selected as 11.8%, but the above value is not limited to this, as long as it meets the test requirements.

[0042] Specifically, the control module determines the reason why the static strength of the sample does not meet the preset standard according to the curvature of the connecting shaft 7, wherein: If the curvature is less than the preset curvature of 2.25 mm / m, the control module determines that the static strength of the sample does not meet the preset standard because the thickness of the support rod 8 of the sample does not meet the standard; If the curvature is greater than or equal to the preset curvature, the control module determines that the static strength of the sample does not meet the preset standard because the diameter of the connecting shaft 7 does not meet the standard; the curvature of the connecting shaft 7 is obtained through a strain gauge, and the model of the strain gauge can be EA-06-250MQ-350 or EA-06-125UW-120. There is no specific limitation, as long as the detection requirements of the curvature of the connecting shaft 7 are met.

[0043] In this embodiment, the preset curvature is obtained by comprehensive analysis and evaluation of historical test data before this test and corresponding historical test results.

[0044] Specifically, the control module determines whether the dynamic strength test of the sample meets the preset standard according to the vibration evaluation value of the connecting shaft 7, wherein: If the vibration evaluation value is less than the first preset vibration threshold value of 0.85, the control module determines that the dynamic strength test of the sample meets the preset standard; If the vibration evaluation value is greater than or equal to the first preset vibration threshold and less than the second preset vibration threshold of 1.45, the control module determines that the dynamic strength test of the sample does not meet the preset standard, and determines that the reason is that the assembly clearance between the connecting hole and the connecting shaft 7 does not meet the standard; If the vibration evaluation value is greater than or equal to the second preset vibration threshold, the control module determines that the dynamic strength test of the sample does not meet the preset standard, and determines that the reason is that the stiffness of the connecting shaft 7 does not meet the standard; Specifically, the vibration evaluation value of the connecting shaft 7 is the ratio between the vibration amplitude of the connecting shaft 7 acquired by the acceleration sensor and the preset vibration amplitude of 1.5 mm.

[0045] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A strength detection device for outdoor leisure tables and chairs, characterized in that: include: The hollow testing platform is penetrated by a pair of hydraulic cylinders arranged above the testing platform and a lower pressing plate connected to the hydraulic cylinders; A fixing part, which is arranged at the bottom of the detection platform, comprises a first detection plate, a second detection plate, a nut and a lead screw, wherein the first detection plate is fixedly arranged at one side of the detection platform, the second detection plate is arranged opposite to the first detection plate, nuts are symmetrically arranged at the bottom of both sides of the second detection plate, the lead screw is arranged inside the detection platform, and the lead screw drives the second detection plate to move by rotating through the sleeved nut; The specimen comprises a first support group and a second support group which are symmetrically arranged, wherein the first support group and the second support group are connected by a connecting shaft which horizontally passes through the connecting hole, and the first support group is composed of cross-arranged support rods; A data acquisition module, comprising a displacement sensor arranged on the top of the test platform, a visual sensor arranged on the side wall of the test platform, an acceleration sensor arranged on the sample connection shaft, a torque sensor arranged on the sample connection shaft, and a strain gauge arranged in the middle of the connection shaft, wherein the displacement sensor is arranged perpendicular to the upper surface of the sample, and the visual sensor is arranged along the axial direction of the connection hole; A sample processing module, which is connected to the data acquisition module and the hydraulic cylinder respectively, and is used to determine the initial data of the sample according to the support frame diameter obtained by the visual sensor, wherein the initial data includes the initial support rod length and the initial static load value; A control module is connected to the data acquisition module and the hydraulic cylinder respectively, and is used to increase the initial static load value when the initial static load value does not meet the standard according to the downward displacement, or to determine the adjustment strategy; when the static strength of the sample does not meet the standard according to the rate of change of the rotational resistance of the connecting shaft, the reason for the static strength not meeting the standard is determined according to the curvature of the connecting shaft; and when the dynamic strength of the sample meets the standard according to the vibration evaluation value of the connecting shaft, the control module is used to increase the initial static load value when the initial static load value does not meet the standard according to the downward displacement; or to determine the adjustment strategy; when the static strength of the sample does not meet the standard according to the rate of change of the rotational resistance of the connecting shaft, the reason for the static strength not meeting the standard is determined according to the curvature of the connecting shaft; and 2. The strength detection device for outdoor leisure tables and chairs according to claim 1, characterized in that: In response to the downward displacement being greater than or equal to the first preset downward displacement and less than the second preset downward displacement, the control module determines that the setting of the initial static load value meets the preset standard and performs a static strength test on the sample.

3. The strength detection device for outdoor leisure tables and chairs according to claim 2, characterized in that: The control module increases the initial static load value under the condition that the comparison result of the downward displacement is less than the first preset downward displacement value and determines that the setting of the initial static load value does not meet the preset standard, and the control module determines, under the condition that the downward displacement is greater than or equal to the second preset downward displacement, an adjustment strategy that determines that the setting of the initial static load value does not meet the preset standard according to the area deformation rate of the connecting hole; The downward displacement is the vertical distance between the upper surface of the sample before the static strength test and the upper surface of the sample after the static strength test.

4. The strength detection device for outdoor leisure tables and chairs according to claim 3, characterized in that: The control module determines, according to the area deformation value of the connection hole, an adjustment strategy under the condition that the setting of the initial static load value does not meet the preset standard, including: Under the condition that the area deformation rate is less than the preset area deformation rate, reducing the initial support rod length of the sample according to the difference between the preset area deformation rate and the area deformation rate; or, under the condition that the area deformation rate is greater than or equal to the preset area deformation rate, reducing the initial static load value according to the difference between the area deformation rate and the preset area deformation rate; The area deformation rate of the connection hole is the ratio between the area of ​​the connection hole after the static strength test and the area of ​​the connection hole before the static strength test.

5. The strength detection device for outdoor leisure tables and chairs according to claim 4, characterized in that: The control module determines that the static strength of the sample meets the preset standard according to the comparison result that the rotation resistance change rate of the connecting shaft is less than the preset rotation resistance change rate, and performs a dynamic strength test on the sample; The rotational resistance change rate of the connecting shaft is determined by the rotational resistance value of the connecting shaft after the static strength test of the sample and the rotational resistance value of the connecting shaft before the static strength test of the sample.

6. The strength detection device for outdoor leisure tables and chairs according to claim 5, characterized in that: The control module determines the reason why the static strength of the sample does not meet the preset standard according to the curvature of the connecting shaft under the condition that the static strength of the sample does not meet the preset standard.

7. The strength detection device for outdoor leisure tables and chairs according to claim 6, characterized in that: The control module determines the reason why the static strength of the sample does not meet the preset standard according to the curvature of the connecting shaft, wherein: If the curvature is less than the preset curvature, the control module determines that the reason why the static strength of the sample does not meet the preset standard is that the thickness of the support rod of the sample does not meet the standard; If the curvature is greater than or equal to the preset curvature, the control module determines that the reason why the static strength of the sample does not meet the preset standard is that the diameter of the connecting shaft does not meet the standard; the curvature of the connecting shaft is obtained by a strain gauge.

8. The strength detection device for outdoor leisure tables and chairs according to claim 7, characterized in that: The control module determines that the dynamic strength test of the sample meets the preset standard according to the comparison result that the vibration evaluation value of the connecting shaft is less than the first preset vibration threshold.

9. The strength detection device for outdoor leisure tables and chairs according to claim 8, characterized in that: The control module determines the reason why the dynamic strength test of the sample does not meet the preset standard according to the vibration evaluation value of the connecting shaft, including: If the vibration evaluation value is greater than or equal to the first preset vibration threshold and less than the second preset vibration threshold, the reason is that the assembly clearance between the connecting hole and the connecting shaft does not meet the standard; If the vibration evaluation value is greater than or equal to the second preset vibration threshold, the reason is that the stiffness of the connecting shaft does not meet the standard.

10. The strength detection device for outdoor leisure tables and chairs according to claim 9, characterized in that: The vibration evaluation value of the connecting shaft is the ratio between the vibration amplitude of the connecting shaft obtained by the acceleration sensor and the preset vibration amplitude.

Images