Wooden chair detection system and detection method thereof

Abstract

The invention relates to the technical field of furniture detection, in particular to a wooden chair detection system and a detection method thereof.The wooden chair detection system comprises an impact unit and a local extrusion unit, a wooden chair enters the local extrusion unit to be detected after being subjected to impact detection, and the impact unit comprises a clamping platform, an ejection assembly and a high-speed camera; the ejection assembly pushes the clamping platform in an ejection mode, rapid displacement of the clamping platform is achieved, and therefore instantaneous impact force is applied to the wooden chair, the high-speed camera is used for detecting and recording deformation and movement tracks of the wooden chair in the impact process, the local extrusion unit comprises a placement table and an extrusion assembly, the placement table is used for limiting the wooden chair, and the extrusion assembly is used for extruding the wooden chair. The extrusion assembly synchronously extrudes and impacts the two corresponding chair legs of the wooden chair so as to detect the stability between the chair legs, impact detection and local extrusion detection are combined, and the strength of the overall structure of the wooden chair and the local stability of the joints of the chair legs and the mortise and tenon joints can be comprehensively detected.

Description

Technical Field

[0001] The present invention relates to the technical field of furniture detection, and more specifically, to a wooden chair detection system and a detection method thereof. Background Art

[0002] As an important part of furniture products, wooden chairs have a direct impact on the comfort and safety of users due to their structural design and quality. As an important craft in traditional furniture, the mortise and tenon joint structure is widely used in the manufacture of wooden chairs with its exquisite wood splicing method. However, wooden chairs are frequently subjected to external forces in daily use, which can cause fatigue and wear of their structures.

[0003] In the prior art, conventional wooden chair inspection methods mainly evaluate the durability and structural stability of wooden chairs through static loading tests or destructive tests. There is still a lack of effective means for dynamic inspection of the overall and local connection parts (especially mortise and tenon structures and chair legs) of wooden chairs, making it difficult to accurately simulate the structural damage and deformation of wooden chairs after multiple impacts or extrusions. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a wooden chair detection system and detection method which has a reasonable and simple structure, strong practicality, and can comprehensively detect the strength of the overall structure of the wooden chair and the local stability of the chair legs and mortise and tenon joints.

[0005] To achieve the above object, the present invention provides the following technical solutions: A wooden chair detection system includes an impact unit and a local extrusion unit. After the wooden chair is subjected to impact detection, it enters the local extrusion unit for detection. The impact unit includes a clamping platform, an ejection assembly and a high-speed camera. The clamping platform is used to fix the wooden chair. The ejection assembly pushes the clamping platform by ejection to achieve rapid displacement of the clamping platform, thereby applying instantaneous impact force to the wooden chair. The high-speed camera is used to detect and record the deformation and motion trajectory of the wooden chair during the impact process, so as to output the working condition of the wooden chair through later video analysis. The local extrusion unit comprises a placement platform and an extrusion assembly. The placement platform is used to limit the position of the wooden chair. The extrusion assembly performs synchronous extrusion and impact on two corresponding chair legs of the wooden chair so as to detect the stability between the chair legs.

[0006] The present invention is further configured as follows: the impact unit further comprises a frame, the frame is provided with a guide rail for movably connecting the clamping platform thereto, and the clamping platform is provided with a clamp for fixing the wooden chair; The ejection assembly includes a motor, a transmission belt and a spring. The frame is rotatably connected with a driving gear and a driven gear, and the two ends of the transmission belt are respectively set between the driving gear and the driven gear. The driving gear is driven to rotate by the motor, driving the transmission belt to perform circular motion; The transmission belt is provided with a push piece, which cooperates with the clamping platform. When the transmission belt is driven by the driving gear, the push piece pushes the clamping platform to move along the guide rail to a predetermined position. One end of the spring is connected to the clamping platform, and the other end is fixed to the frame, so as to store energy when the clamping platform moves to a predetermined position, and after the push piece is separated from the clamping platform, the spring releases the stored energy to eject the clamping platform back to the initial position.

[0007] The present invention is further configured as follows: the clamping platform comprises a top plate and a base, an impact portion is provided on the end of the top plate, and an end surface of the impact portion is in an arc shape. A plurality of connection holes are provided on the top plate, and casters are connected to the bottom surface of the top plate through a connecting rod. There are four casters, which are symmetrically arranged on both sides of the top plate in pairs. Guide components are arranged on two symmetrical outer walls of the base.

[0008] The present invention is further configured as follows: a slide groove for the caster to move is provided on the guide rail, and an opening for the guide component to extend into is provided on the side wall of the guide rail.

[0009] The present invention is further configured as follows: the clamp includes a cylinder and a rod body, the cylinder is provided with a cavity for inserting the chair legs, a splint is movably connected in the cavity, a threaded hole connected to the cavity is provided on the outer peripheral wall of the cylinder, a rotating handle is threadedly connected to the threaded hole, the output end of the rotating handle is connected to the splint to control the squeezing force of the splint on the chair legs, and the rod body is threadedly connected to the connecting hole.

[0010] The present invention is further configured as follows: four positioners are provided on the placement table, each corresponding to the four chair legs; a movable groove is provided on the upper end surface of the positioner; a block is fixed on one side of the movable groove; a baffle is movably connected in the movable groove; a spring is connected between the baffle and the block so that the spring is compressed when the chair leg leans against the baffle.

[0011] The present invention is further configured as follows: the extrusion assembly comprises two symmetrically arranged extruders, the extruders comprising a chassis, a guide frame, a second motor, a striker and a guide plate, There are two guide plates, which are rotatably connected to the front and rear sides of the guide frame respectively. The second power output end of the motor is connected to one of the guide plates to drive the guide plate to rotate. There are two strikers, which are movably connected to the left and right ends of the guide frame respectively. One end of the striker is movably connected to the guide plate so that when the guide plate rotates, the striker is driven to make a reciprocating motion to impact the chair leg.

[0012] The present invention is further configured as follows: a guide groove is opened on one end surface of the guide plate, the striker includes a guide rod and an impact rod, the impact rod and the guide rod are detachably connected, bearings are connected at both ends of the guide rod, the bearings are placed in the guide groove, and the guide groove forms a path for the bearing to move, and the path is in the shape of an "8".

[0013] The front and rear side walls of the guide frame are provided with openings for the guide rod to move, and the left and right ends of the guide frame are provided with through holes for the guide impact rod to move. The impact rod is connected to the middle part of the guide rod.

[0014] A transmission rod is passed through the middle of the guide frame, and the two ends of the transmission rod are connected to the two guide plates. The transmission rod passes through the center of one of the guide plates and then extends out to be connected to a driven wheel. The output end of the motor is connected to a driving wheel, and the driving wheel and the driven wheel are connected through a transmission toothed belt.

[0015] The present invention is further configured as follows: a motor three, a bidirectional screw and sliding rods placed on both sides of the bidirectional screw are also provided on the mounting platform; the output end of the motor three is connected to one end of the bidirectional screw; the bottoms of the two extruders are respectively connected to the nuts on the bidirectional screw; and the bottom of the extruder has a sliding block sleeved on the sliding rod.

[0016] A method for detecting a wooden chair comprises the following steps: S1. Place the wooden chair to be tested on the clamping platform of the impact unit: fix the chair legs with a clamp to ensure that the wooden chair will not move or shake during the subsequent testing process; S2. Start the impact unit for testing: The driving belt is driven by the motor 1 to drive the active gear, pushing the clamping platform to move quickly to the predetermined position. When the clamping platform reaches the set position, the spring in the ejection assembly releases the stored energy, causing the clamping platform to produce an instantaneous ejection motion, exerting an instantaneous impact force on the wooden chair. S3, using high-speed camera equipment to record the movement trajectory and deformation of the wooden chair during the impact process; S4. Move the wooden chair into the local extrusion unit for chair leg inspection: Place the wooden chair on the placement table of the local extrusion unit. The positioner on the placement table limits the four chair legs to ensure that each chair leg is fixed in an appropriate position. S5, start the extrusion assembly and perform symmetrical extrusion detection: Motor 2 drives the guide plate to rotate through transmission, and the striker reciprocates under the guidance of the guide plate to synchronously impact both sides of the chair leg. According to the preset number of impacts, the impact detection cycle of different intensities is set to gradually increase the cumulative impact effect on the chair leg; S6. After the test is completed, the system automatically summarizes the data of each stage, including impact force, reaction force, deformation amplitude and number of times, and generates a test report.

[0017] Compared with the shortcomings of the prior art, the beneficial effects of the present invention are: Combining impact testing with local extrusion testing can comprehensively test the strength of the overall structure of wooden chairs and the local stability of the chair legs and mortise and tenon joints. By applying gradually accumulated forces during the impact and extrusion process, the fatigue loss of wooden chairs in long-term use can be simulated, and its performance and service life in real use environments can be accurately evaluated. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the impact unit of the present invention in the first direction; Figure 2 It is a schematic structural diagram of the impact unit of the present invention in the second direction; Figure 3 It is a structural schematic diagram of the local extrusion unit of the present invention; Figure 4 It is a partial schematic diagram of the extruder of the present invention; Figure 5 is a perspective view schematic diagram of an extruder of the present invention; Figure 6 It is a schematic structural diagram of the clamp of the present invention.

[0019] Frame 1, clamping platform 2, ejection assembly 3, guide rail 11, slide groove 10, opening 101, top plate 21, base 22, impact part 211, impact platform 12, connecting hole 20, fixture 4, cylinder 41, rod body 42, clamping plate 43, rotating handle 44, caster 23, guide component 24, driving gear 13, driven gear 14, motor 1 31, transmission belt 32, spring 33, push piece 5, placement platform 6, positioner 7, movable groove 70, block 71, baffle 72, connecting component 73, extruder 8, chassis 81, guide frame 82, motor 2 83, striker 84, guide plate 85, guide groove 850, motor 3 91, bidirectional screw rod 92, slide rod 93, extension sheet 80, guide rod 841, impact rod 842, bearing 843, driving wheel 86, driven wheel 87. DETAILED DESCRIPTION

[0020] Reference Figures 1 to 6 The embodiments of the present invention are further described.

[0021] This embodiment specifically includes an impact unit, a local extrusion unit and a data processing unit. After the impact test, the wooden chair enters the local extrusion unit for testing. The data collected from sensors and cameras are transmitted to the data processing unit, which generates various mechanical curves, including deformation curves, through the software analysis system. The data processing unit can display the deformation of chair legs or mortise and tenon structures in real time, helping to identify fatigue or fracture problems that may occur in wooden chairs during the extrusion process.

[0022] The impact unit includes a frame 1, a clamping platform 2, an ejection assembly 3 and a high-speed camera. The clamping platform 2 is used to fix the wooden chair. The ejection assembly 3 pushes the clamping platform 2 by ejection to achieve rapid displacement of the clamping platform 2, thereby applying an instantaneous impact force to the wooden chair. The high-speed camera is used to detect and record the deformation and movement trajectory of the wooden chair during the impact process, so as to output the working condition of the wooden chair through subsequent video analysis.

[0023] To achieve the above, its specific structure is as follows: A guide rail 11 is installed on the frame 1 , and a guide groove 10 for guiding the direction is opened downward on the upper end surface of the guide rail 11 , and openings 101 communicating with the guide groove 10 are opened on the outer walls on both sides corresponding to the guide rail 11 .

[0024] The clamping platform 2 includes a top plate 21 and a base 22 . An impact portion 211 is provided on the end of the top plate 21 . The end surface of the impact portion 211 is in an arc shape. An impact platform 12 for receiving the impact of the impact portion 211 is provided on the frame 1 .

[0025] A plurality of connection holes 20 are provided on the top plate 21. The connection holes 20 have internal threads, and a clamp 4 for fixing the wooden chair is connected by threaded connection. The purpose of the detachable clamp 4 is to be able to correspond to wooden chairs of different specifications, especially different diameters, thicknesses or geometric shapes of chair legs, which can improve the versatility and ease of operation of the system, making the detection of different models of wooden chairs more efficient.

[0026] The clamp 4 includes a cylinder 41 and a rod 42. The cylinder 41 has a cavity for inserting the chair legs. The depth of the cavity is 1 / 3-1 / 2 of the length of the chair legs. A splint 43 is movably connected in the cavity. A threaded hole connected to the cavity is provided on the outer wall of the cylinder 41. A rotating handle 44 is threadedly connected to the threaded hole. The output end of the rotating handle 44 is connected to the splint 43 to control the squeezing force of the splint 43 on the chair legs. The rod 42 is threadedly connected to the connecting hole.

[0027] The bottom surface of the top plate 21 is connected with casters 23 via a connecting rod. There are four casters 23 , which are symmetrically arranged in pairs on both sides of the top plate 21 . The casters 23 are placed in the slide groove 10 of the guide rail 11 and cooperate with the slide groove 10 .

[0028] Guide components 24 are provided on two symmetrical outer walls of the base 22 , and the guide components 24 extend from the opening 101 of the guide rail 11 .

[0029] A driving gear 13 and a driven gear 14 are installed on the frame 1 below the clamping platform 2 , and two ends of the transmission belt 32 are respectively sleeved between the driving gear 13 and the driven gear 14 .

[0030] The ejection assembly 3 includes a motor 31, a transmission belt 32 and a spring 33, wherein the driving gear 13 is driven to rotate by the motor 31, driving the transmission belt 32 to perform a circular motion. Two symmetrical first connecting rings are provided below the impact platform 12 of the frame 1, and two symmetrical second connecting rings are provided on the base 22 of the clamping platform 2. The spring 33 has two roots, and the two ends of the spring 33 are connected to the first connecting ring and the second connecting ring. By replacing the spring 33, the ejection force during the ejection test can be flexibly adjusted to meet the test requirements of different strengths. The parameters of the spring (such as stiffness coefficient, elastic modulus and free length) determine its performance when storing and releasing energy. Therefore, selecting springs with different stiffness can change the acceleration and impact force of the clamping platform 2 during ejection.

[0031] A push piece 5 is fixed on the front side of the transmission belt 32, and the push piece 5 cooperates with the clamping platform 2. When the transmission belt 32 is driven by the driving gear 13, the push piece 5 runs to and abuts against the base 22 of the clamping platform 2. When the transmission belt 32 continues to run, it will push the clamping platform 2 to move away from the impact platform 12. During this period, the clamping platform 2 stores energy through the cooperation of the casters 23 and the guide rails 11 until it moves to a predetermined position. After the push piece 5 is detached from the clamping platform 2, the spring releases the stored energy to eject the clamping platform 2 back to the initial position. During this period, the impact part 211 will hit the impact platform 12.

[0032] When the clamping platform 2 is pushed rapidly by the ejection assembly 3 through the force of the spring, the wooden chair will be subjected to the combined effects of inertia and ejection forces. At this time, the structure of the wooden chair (especially the mortise and tenon joints and the chair legs) will experience a large instantaneous acceleration, resulting in the following situations: Stress concentration: Due to the uneven inertial force on various parts of the wooden chair, local stress concentration will occur in the legs, mortise and tenon structure and backrest, resulting in deformation or loosening. If the mortise and tenon connection is not strong enough, there will be slight sliding or loosening. Deflection of the chair legs: Due to the rapid movement of the ejection platform, the chair legs will bend or deflect slightly at the moment of force, especially at the connection between the chair legs and the seat surface. These deflections are key indicators of the structural strength of wooden chairs.

[0033] Vibration propagation: The wooden chair will experience a series of vibrations during the entire process, and the vibrations will quickly propagate to all parts of the wooden chair from the time of ejection. If the structure is not well designed, the vibrations will cause irregular deformations in some parts, such as loose mortise and tenon parts or cracks in the chair legs.

[0034] When the clamping platform 2 rebounds quickly and contacts the impact platform 12, the wooden chair will experience a reaction force impact, which is instantaneous and has a high intensity. After the impact, the structure of the wooden chair will show the following characteristics: Compression and bending caused by reaction force: When a wooden chair is hit, especially when the legs and seat are subjected to direct impact force, compression and bending will occur. The mortise and tenon structure will also be affected by the shock wave, causing temporary looseness or vibration. This situation can be captured by a high-speed camera.

[0035] Deformation and rebound: If the material of the wooden chair has a certain elasticity, the chair legs will bend or deform slightly during the impact, and quickly rebound to their original shape after the force disappears. For brittle materials or poorly crafted mortise and tenon structures, this process will cause microcracks and even irreversible damage.

[0036] Stability test of mortise and tenon structure: Impact will produce instantaneous torque and shear force on the mortise and tenon structure. If the mortise and tenon structure is poorly designed, it will slip, loosen or misalign. This damage will not be immediately apparent, but subtle changes in the mortise and tenon joints can be observed through multiple impact tests.

[0037] Vibration and resonance effects: Wooden chairs will vibrate and resonate in a short period of time after impact, especially in long and thin structures such as backrests and legs. If the design is not reasonable, the resonance will aggravate the damage of the chair and even cause local cracking or deformation.

[0038] High-speed cameras can clearly capture the subtle dynamic changes of the wooden chair during ejection and impact. By analyzing these videos, the following information can be obtained: Minor deformations of chair legs and mortise and tenon joints: Analyze the deformation trajectory of the wooden chair at the moment of impact, calculate the strain value of the joints between the chair legs and mortise and tenon joints, and determine whether there is potential fatigue or damage.

[0039] Elastic and plastic deformation: Based on the deformation recovery process in the video, determine whether the material of the wooden chair is elastically deformed (i.e., it returns to its original shape after deformation) or plastically deformed (i.e., permanent deformation).

[0040] Fatigue life assessment: Through the deformation data of multiple impact tests, the fatigue life of the wooden chair can be evaluated and the damage accumulation of the structure after multiple impacts can be analyzed.

[0041] The local extrusion unit includes a placement table 6 and an extrusion component.

[0042] The placement platform 6 is provided with four positioners 7 corresponding to the four chair legs, respectively. The upper end surface of the positioner 7 is provided with a movable groove 70, a block 71 is fixed on one side of the movable groove 70, a baffle 72 is movably connected in the movable groove 70, and a spring is connected between the baffle 72 and the block 71, so that when the chair leg leans against the baffle 72, the spring is compressed, so that the chair leg has a certain controllable buffering effect when it is impacted. A displacement sensor is installed on the block 71 to sense the movable distance of the baffle 72, so as to determine whether the chair leg is deformed and displaced during the impact process. The positioner 7 is provided with a hole for fixing it to the placement platform 6.

[0043] The positioner 7 has a connecting component 73 , a cavity is formed on the connecting component 73 , and a through hole communicating with the cavity is formed on the connecting component 73 .

[0044] The extrusion assembly includes two symmetrically arranged extruders 8, and the extruder 8 includes a chassis 81, a guide frame 82, a second motor 83, a striker 84 and a guide plate 85. The placement table 6 is also provided with a motor three 91, a bidirectional screw rod 92 and a slide bar 93 placed on both sides of the bidirectional screw rod 92. The output end of the motor three 91 is connected to one end of the bidirectional screw rod 92. The bottoms of the two extruders 8 are respectively connected to the nuts on the bidirectional screw rod 92. The bottom of the extruder 8 has a slider sleeved on the slide bar 93, and an extension piece 80 is provided on the slider. The extension piece 80 is provided with a connecting hole. The extension piece 80 is inserted into the connecting part 73 of the positioner 7, and then the positioner 7 and the extension piece 80 are fixed by screws, so as to adjust the distance between the positioner 7 and the extruder 8 to meet the requirements of detecting chairs of different sizes.

[0045] Motor three 91 is responsible for driving the bidirectional screw rod 92, driving the extruder 8 to move along the slide rod 93. The system can automatically adjust the position of the extruder 8 to adapt to wooden chairs of different sizes. For chairs of different sizes, the position of the bidirectional screw rod 92 can be controlled by motor three 91 to align the extruder 8 with both sides of the chair legs.

[0046] There are two guide plates 85 , which are rotatably connected to the front and rear sides of the guide frame 82 respectively. A guide groove 850 is formed on one end surface of the guide plate 85 .

[0047] There are two strikers 84 , which are movably connected to the left and right ends of the guide frame 82 respectively. The striker 84 includes a guide rod 841 and a collision rod 842 . The collision rod 842 and the guide rod 841 are detachably connected. Both ends of the guide rod 841 are connected with bearings 843 .

[0048] The bearing 843 is placed in the guide groove 850, and the guide groove forms a path for the bearing 843 to move, and the path is in the shape of an "8".

[0049] The front and rear side walls of the guide frame 82 are provided with openings 101 for the guide rod 841 to move. The left and right ends of the guide frame 82 are provided with through holes for the guide impact rod 842 to move. The impact rod 842 is connected to the middle of the guide rod 841.

[0050] A transmission rod passes through the middle of the guide frame 82, and both ends of the transmission rod are connected to two guide plates 85. The transmission rod passes through the center of one of the guide plates 85 and then extends out to be connected to a driven wheel 87. The output end of the motor 2 83 is connected to a driving wheel 86, and the driving wheel 86 and the driven wheel 87 are connected by a transmission toothed belt.

[0051] When the wooden chair legs are fixed in place, the motor 2 83 drives the guide plate 85 to rotate, and the bearing 843 moves along the guide groove path, driving the connected striker 84 to make linear motion. Due to the "8"-shaped design of the guide groove, the striker 84 can move repeatedly in the horizontal direction, gradually exerting periodic impacts on the wooden chair legs.

[0052] Whenever the bearing 843 completes a half-figure-8 motion in the guide groove 850, the striker 84 completes a reciprocating impact motion. Since the guide groove is a closed-loop path, the striker 84 can maintain continuous motion during each rotation of the guide plate 85, ensuring the stability and consistency of the extrusion force.

[0053] By controlling the rotation speed of the motor 2 83, the rotation speed of the guide plate 85 can be adjusted, thereby controlling the movement frequency of the striker 84. Impacts of different frequencies can simulate mechanical environments of different intensities and evaluate the performance of the chair legs under different loads.

[0054] The guide rod 841 and the impact rod 842 of the striker 84 are detachably connected, so the length and stroke of the impact rod 842 can be replaced as needed to adapt to chair legs of different sizes and testing requirements.

[0055] A method for detecting a wooden chair comprises the following steps: The first step is to place the wooden chair to be tested on the clamping platform of the impact unit: fix the chair legs with a clamp to ensure that the wooden chair will not move or shake during the subsequent testing process; The second step is to start the impact unit for testing: the motor drives the transmission belt to drive the active gear, pushing the clamping platform to move quickly to the predetermined position. When the clamping platform reaches the set position, the spring in the ejection assembly releases the stored energy, causing the clamping platform to produce an instantaneous ejection movement, exerting an instantaneous impact force on the wooden chair. The third step is to use high-speed camera equipment to record the movement trajectory and deformation of the wooden chair during the impact process; Step 4: Move the wooden chair into the local extrusion unit for chair leg inspection: Place the wooden chair on the placement table of the local extrusion unit. The positioner on the placement table limits the four chair legs to ensure that each chair leg is fixed in the appropriate position. Step 5: Start the extrusion assembly and perform symmetrical extrusion detection: Motor 2 drives the guide plate to rotate through transmission, and the striker reciprocates under the guidance of the guide plate to synchronously impact both sides of the chair leg. According to the preset number of impacts, the impact detection cycle of different intensities is set to gradually increase the cumulative impact effect on the chair leg; Step 6: After the test is completed, the system automatically summarizes the data of each stage, including impact force, reaction force, deformation amplitude and number of times, and generates a test report.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A wooden chair detection system, characterized in that: It includes an impact unit and a local extrusion unit. After the impact test, the wooden chair will enter the local extrusion unit for testing. The impact unit includes a clamping platform, an ejection assembly and a high-speed camera. The clamping platform is used to fix the wooden chair. The ejection assembly pushes the clamping platform by ejection to achieve rapid displacement of the clamping platform, thereby applying instantaneous impact force to the wooden chair. The high-speed camera is used to detect and record the deformation and motion trajectory of the wooden chair during the impact process, so as to output the working condition of the wooden chair through later video analysis. The local extrusion unit comprises a placement platform and an extrusion assembly. The placement platform is used to limit the position of the wooden chair. The extrusion assembly performs synchronous extrusion and impact on two corresponding chair legs of the wooden chair so as to detect the stability between the chair legs.

2. A wooden chair detection system according to claim 1, characterized in that: The impact unit also includes a frame, on which a guide rail is provided for a clamping platform to be movably connected, and a clamp is provided on the clamping platform for fixing the wooden chair; The ejection assembly includes a motor, a transmission belt and a spring. The frame is rotatably connected with a driving gear and a driven gear, and the two ends of the transmission belt are respectively set between the driving gear and the driven gear. The driving gear is driven to rotate by the motor, driving the transmission belt to perform circular motion; The transmission belt is provided with a push piece, which cooperates with the clamping platform. When the transmission belt is driven by the driving gear, the push piece pushes the clamping platform to move along the guide rail to a predetermined position. One end of the spring is connected to the clamping platform, and the other end is connected to the frame, so as to store energy when the clamping platform moves to a predetermined position, and after the push piece is separated from the clamping platform, the spring releases the stored energy to eject the clamping platform back to the initial position.

3. A wooden chair detection system according to claim 2, characterized in that: The clamping platform includes a top plate and a base. An impact part is provided on the end of the top plate. The end surface of the impact part is in an arc shape. A plurality of connection holes are provided on the top plate, and casters are connected to the bottom surface of the top plate through a connecting rod. There are four casters, which are symmetrically arranged on both sides of the top plate in pairs. Guide components are arranged on two symmetrical outer walls of the base.

4. A wooden chair detection system according to claim 3, characterized in that: The guide rail is provided with a slide groove for the caster to move, and the side wall of the guide rail is provided with an opening for the guide component to extend into.

5. A wooden chair detection system according to claim 3, characterized in that: The clamp includes a cylinder and a rod body. The cylinder is provided with a cavity for inserting the chair legs. A splint is movably connected in the cavity. A threaded hole connected to the cavity is opened on the outer wall of the cylinder. A rotating handle is threadedly connected to the threaded hole. The output end of the rotating handle is connected to the splint to control the squeezing force of the splint on the chair legs. The rod body is threadedly connected to the connecting hole.

6. A wooden chair detection system according to claim 2, characterized in that: The mounting platform is provided with four positioners respectively corresponding to the four chair legs. A movable groove is opened on the upper end surface of the positioner. A block is fixed on one side of the movable groove. A baffle is movably connected in the movable groove. A spring is connected between the baffle and the block so that the spring is compressed when the chair leg leans against the baffle.

7. A wooden chair detection system according to claim 6, characterized in that: The extrusion assembly includes two symmetrically arranged extruders, each of which includes a chassis, a guide frame, a second motor, a striker and a guide plate. There are two guide plates, which are rotatably connected to the front and rear sides of the guide frame respectively. The second power output end of the motor is connected to one of the guide plates to drive the guide plate to rotate. There are two strikers, which are movably connected to the left and right ends of the guide frame respectively. One end of the striker is movably connected to the guide plate so that when the guide plate rotates, the striker is driven to make a reciprocating motion to impact the chair leg.

8. A wooden chair detection system according to claim 7, characterized in that: A guide groove is provided on one end surface of the guide plate. The striker includes a guide rod and an impact rod. The impact rod and the guide rod are detachably connected. Bearings are connected at both ends of the guide rod. The bearings are placed in the guide groove. The guide groove forms a path for the bearing to move. The path is in the shape of "8". The front and rear side walls of the guide frame are provided with openings for the guide rod to move, and the left and right ends of the guide frame are provided with through holes for the guide impact rod to move. The impact rod is connected to the middle part of the guide rod. A transmission rod is passed through the middle of the guide frame, and the two ends of the transmission rod are connected to the two guide plates. The transmission rod passes through the center of one of the guide plates and then extends out to be connected to a driven wheel. The output end of the motor is connected to a driving wheel, and the driving wheel and the driven wheel are connected through a transmission toothed belt.

9. A wooden chair detection system according to claim 6, characterized in that: The mounting platform is also provided with motor three, a bidirectional screw and sliding rods placed on both sides of the bidirectional screw rod. The output end of motor three is connected to one end of the bidirectional screw rod. The bottoms of the two extruders are respectively connected to the nuts on the bidirectional screw rod. The bottom of the extruder has a slider sleeved on the sliding rod.

10. A detection method applicable to the wooden chair of claims 1-9, characterized in that: The steps include: S1. Place the wooden chair to be tested on the clamping platform of the impact unit: fix the chair legs with a clamp to ensure that the wooden chair will not move or shake during the subsequent testing process; S2. Start the impact unit for testing: The driving belt is driven by the motor 1 to drive the active gear, pushing the clamping platform to move quickly to the predetermined position. When the clamping platform reaches the set position, the spring in the ejection assembly releases the stored energy, causing the clamping platform to produce an instantaneous ejection motion, exerting an instantaneous impact force on the wooden chair. S3, using high-speed camera equipment to record the movement trajectory and deformation of the wooden chair during the impact process; S4. Move the wooden chair into the local extrusion unit for chair leg inspection: Place the wooden chair on the placement table of the local extrusion unit. The positioner on the placement table limits the four chair legs to ensure that each chair leg is fixed in an appropriate position. S5, start the extrusion assembly and perform symmetrical extrusion detection: Motor 2 drives the guide plate to rotate through transmission, and the striker reciprocates under the guidance of the guide plate to synchronously impact both sides of the chair leg. According to the preset number of impacts, the impact detection cycle of different intensities is set to gradually increase the cumulative impact effect on the chair leg; S6. After the test is completed, the system automatically summarizes the data of each stage, including impact force, reaction force, deformation amplitude and number of times, and generates a test report.

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