A resiliency testing device for a sponge cushion

Abstract

This invention discloses a testing device for the resilience of a sponge seat cushion, comprising a testing base, a pressure driving component, and a pressure plate. A gantry frame is mounted on the top surface of the testing base, and a pressure seat is slidably mounted on the inner side of the gantry frame via a guide rod. The pressure driving component is mounted on the bottom surface of the pressure seat. A pressure sensor array and a millimeter-wave radar are integrated on the bottom surface of the pressure plate to acquire pressure distribution data during compression and three-dimensional rebound morphology data after release, respectively. A lead screw motor and lead screw structure are located at the bottom of the testing base for overall height adjustment. The device also includes a control system for unified control of pressure loading, data acquisition, and analysis. This invention achieves stable and uniform loading of the pressure plate through a four-bar parallel drive structure and combines a pressure sensor array and millimeter-wave radar to achieve multi-dimensional detection of the rebound process, significantly improving the accuracy, comprehensiveness, and automation level of sponge seat cushion resilience performance testing.

Description

Technical Field

[0001] This invention relates to the field of foam cushion testing equipment technology, specifically to a foam cushion resilience testing device. Background Technology

[0002] In the production and quality control of foam seat cushions (including car seat foam, sofa cushions, high-speed rail seat cushions, etc.), resilience is the core performance indicator for evaluating their comfort, durability and safety.

[0003] Existing foam cushion resilience testing devices mainly employ the following two driving methods: One type is the screw-driven testing device, which uses a servo motor to drive the screw and nut pair to vertically press down the pressure plate. This type of device has a simple structure and low cost, but it has the following obvious defects: ① The pressure plate is usually driven by a single point or a few guide rods. During the pressing process, slight tilting can easily occur due to guide clearance, assembly errors, or load eccentricity, resulting in the pressure plate not being able to fully parallel and adhere to the sponge surface, causing local pressure to be too high or too low, resulting in large deviations and poor repeatability of test results; ② It can only collect a single total pressure value and cannot obtain the pressure distribution on the sponge surface, making it impossible to effectively detect hidden defects such as uneven density, air bubbles, or hard lumps inside the sponge; ③ The pressure plate rises slowly, and there is obvious damping during the release process, making it impossible to achieve instantaneous no-load rebound testing and difficult to accurately capture the dynamic rebound characteristics of the sponge.

[0004] Another type is the hydraulically driven testing device, which is powered by hydraulic cylinders. Although hydraulic systems have high output and long stroke, they have the following problems: ① Synchronous control of multiple hydraulic cylinders is difficult, and fluctuations in pipeline pressure and lag in cylinder response can easily lead to plate tilting and uneven pressure; ② The hydraulic system has a complex structure, including components such as oil pumps, valve groups, and seals, which are prone to oil leakage, environmental pollution, high maintenance costs, and high energy consumption; ③ It is also difficult to achieve real-time detection of pressure distribution on the sponge surface and rapid three-dimensional rebound morphology reconstruction after the pressure plate is completely removed.

[0005] Furthermore, existing testing devices generally employ a single force sensor or displacement sensor, resulting in limited testing functionality. A single test can only obtain limited macroscopic indicators (such as overall rebound height and compression), failing to comprehensively reflect the surface pressure uniformity, rebound volume recovery rate, and surface morphology recovery of the foam seat cushion. Especially in fields with extremely high comfort requirements, such as high-end car seats and high-speed rail seat foams, existing technologies are insufficient to meet increasingly stringent quality testing demands.

[0006] Therefore, developing an intelligent testing device that can achieve absolutely parallel downward pressure of the pressure plate, has the ability to detect surface pressure distribution in real time, and can quickly capture the instantaneous three-dimensional rebound morphology of the sponge has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] This invention aims to solve the technical problems existing in the resilience testing of sponge cushions, such as uneven test force, difficulty in achieving synchronous loading across the entire surface during compression, difficulty in accurately capturing the rebound state at the moment of release, and test results relying heavily on a single force parameter without a comprehensive evaluation of the rebound morphology and local force distribution. Existing testing equipment typically uses a single-point screw indenter, a common flat pressure plate, or a simplified loading mechanism to compress sponge cushions. In actual testing, the accuracy is easily affected by factors such as pressure plate tilt, inconsistent local pressure, or delayed release response. In particular, it is difficult to simultaneously acquire the surface pressure distribution of the sponge cushion during compression and the instantaneous three-dimensional rebound morphology after release, resulting in test results that cannot fully reflect the true resilience performance of the sponge cushion.

[0008] To address the aforementioned technical problems, this invention provides a foam cushion resilience testing device, comprising a testing base, a pressure driving assembly, and a pressure plate. A gantry frame is fixedly mounted on the top surface of the testing base, and a pressure seat is slidably mounted on the inner side of the gantry frame via a guide rod. The pressure driving assembly is fixedly mounted on the bottom surface of the pressure seat. The pressure driving assembly includes a driving seat, a main swing arm, a support rod, and a deformation force gauge. The upper and lower ends of the main swing arm are rotatably connected to the surface of the driving seat and the top of the support rod, respectively. The bottom end of the support rod is movably connected to the top of the deformation force gauge, which is fixed to the top surface of the pressure plate. A dual-output motor is provided inside the driving seat, driving the main swing arm to deflect via a worm gear shaft. A pressure sensor array and a millimeter-wave radar are integrated on the bottom surface of the pressure plate. Through this structural design, the pressure plate can be stably pressed down under the action of the pressure driving assembly, and the pressure distribution detection during the compression stage and the rebound morphology detection during the release stage can be achieved in conjunction with the pressure sensor array and the millimeter-wave radar, thereby constructing a complete foam cushion resilience performance testing system.

[0009] In a preferred embodiment, the pressure sensing array is further configured as follows: a flexible thin-film pressure sensor array or a piezoelectric thin-film array, distributed in a matrix on the bottom surface of the pressure plate, used to acquire pressure distribution cloud maps of the entire surface of the sponge cushion in real time during the pressing process, and to calculate the uniformity index of the rebound force of the sponge surface. By laying the pressure sensing array in a matrix on the bottom surface of the pressure plate, the stress state of each area of ​​the sponge cushion during the compression process can be detected simultaneously, thereby determining the internal density distribution, local hardness differences, and defect distribution of the sponge, improving the surface area detection capability and uniformity evaluation capability during the rebound test.

[0010] In a preferred embodiment, the millimeter-wave radar is further configured such that it is positioned at the center or edge of the bottom surface of the pressure plate, operating at a frequency of 24GHz-77GHz. It is used to perform a non-contact 3D scan of the sponge cushion the instant the pressure plate rises and leaves the cushion, reconstructing a 3D topographic cloud image after rebound, and calculating the rebound volume recovery rate and surface wrinkle index. By using millimeter-wave radar to rapidly and non-contactly sample the instantaneous rebound state of the sponge cushion after release, interference from traditional contact detection on the rebound process can be effectively avoided, thereby improving the timeliness and accuracy of topographic capture after rebound and providing a reliable basis for evaluating the surface recovery capability and topographic stability of the sponge cushion.

[0011] In a preferred embodiment, the main swing arms and support rods are further configured in two sets, symmetrically arranged on both sides of the drive seat, forming a four-bar linkage. This ensures that the pressure plate remains horizontal throughout the entire downward stroke, achieving parallel and uniform contact between the pressure plate and the surface of the sponge cushion. By setting two sets of symmetrically arranged main swing arms and support rods to form a parallel transmission mechanism, the tilting or swaying of the pressure plate during the downward stroke can be limited, ensuring that the pressure plate remains stable and presses down in a uniform posture. This guarantees consistent pressure on the entire surface of the sponge cushion, reduces testing errors, and improves test repeatability.

[0012] In a preferred embodiment, the main pendulum arm is further configured such that a worm gear is provided at its end, and the output end of the dual-output motor is connected to a worm shaft that meshes with the worm gear for transmission, thereby achieving precise deflection and self-locking of the main pendulum arm. Through the meshing transmission between the worm shaft and the worm gear, on the one hand, the transmission accuracy of the main pendulum arm's deflection action can be improved, making the pressure plate loading process more controllable; on the other hand, utilizing the self-locking characteristic of the worm gear transmission, the pressure plate's stable position can be maintained during the pressure holding phase, avoiding rebound interference or unexpected rebound phenomena, which is beneficial to improving the stability of the testing process.

[0013] In a preferred embodiment, the test base is further configured such that a lead screw motor is located at its bottom, and a sliding guide rod and a lead screw fixed to the output end of the lead screw motor are located inside the gantry frame. The lead screw is connected to the pressure seat and is used to drive the entire pressure drive assembly and pressure plate for initial height adjustment. By driving the lead screw motor to raise and lower the pressure seat, the initial position of the pressure plate can be pre-adjusted according to the different thicknesses of the sponge cushions, expanding the applicability of the device and reducing manual adjustment work before formal testing, thus improving test preparation efficiency.

[0014] In a preferred embodiment, the device is further configured such that it includes a control system electrically connected to a dual-output motor, a deformation force gauge, a pressure sensor array, and a millimeter-wave radar. This control system enables real-time monitoring of pressure distribution during the compression process, 3D rebound morphology reconstruction after the instantaneous release of the pressure plate, and the generation of a comprehensive evaluation report on the resilience of the foam cushion. By unifying the control and data processing of the drive and detection units through the control system, test information such as compression stress, release rebound, and morphology recovery can be centrally analyzed, improving the automation level of the test and making the test results more complete, intuitive, and traceable.

[0015] In a preferred embodiment, the pressure plate is further configured such that it is connected to the strut via a force gauge. The force gauge is used to monitor the total pressure applied by the pressure plate to the sponge cushion in real time and to perform fusion calibration with the distributed pressure data collected by the pressure sensor array. By obtaining the overall loading force value through the force gauge and comparing and calibrating it with the area pressure data formed by the pressure sensor array, the accuracy of total pressure control and the accuracy of local pressure identification can be improved, thereby enhancing the reliability and consistency of the test results.

[0016] The beneficial effects achieved by this invention are as follows: 1. In this invention, a four-bar linkage is used to drive the pressure plate, so that the pressure plate remains absolutely horizontal throughout the entire downward stroke, achieving parallel and uniform contact with the surface of the sponge cushion. This completely solves the technical defects of traditional screw-driven single-point propulsion which is prone to tilting and hydraulic drive which has large synchronization errors. It fundamentally ensures the pressure uniformity during the loading process and greatly improves the accuracy and repeatability of rebound test data.

[0017] 2. In this invention, a matrix pressure sensor array is integrated on the bottom surface of the pressure plate. With the uniform pressing of the pressure plate, the pressure distribution cloud map of the entire surface of the sponge cushion can be collected in real time during the pressing and holding process, and the rebound force uniformity index can be calculated. This can accurately identify quality defects such as uneven density, air bubbles, and hard lumps inside the sponge. This is something that traditional single-point force sensors or devices without distribution detection cannot achieve, which significantly improves the precision and reliability of sponge cushion quality detection.

[0018] 3. In this invention, by combining the rapid release characteristics of the four-bar linkage with the millimeter-wave radar on the bottom surface of the pressure plate, a non-contact three-dimensional scan can be completed within 0.5 seconds when the pressure plate is completely separated from the sponge. The 3D shape cloud map after rebound can be reconstructed in real time, and the rebound volume recovery rate, surface wrinkle index and rebound efficiency curve can be calculated. This achieves accurate capture of instantaneous dynamic rebound characteristics and fills the technical gap that existing testing devices cannot perform instantaneous unobstructed rebound shape reconstruction.

[0019] 4. In this invention, the four-bar parallel drive mechanism is deeply integrated with the pressure sensor array, millimeter-wave radar and control system to form a dual-modal testing mode of "process uniformity detection + instantaneous three-dimensional rebound reconstruction". Multiple key indicators that traditional equipment would require multiple units and multiple steps to complete can be tested in one test. The test cycle is short and the degree of automation is high, which is particularly suitable for precision testing in the laboratory and batch online quality inspection in the production line. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of the test base and gantry frame according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a pressure drive assembly and pressure plate structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a pressure-driven component structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure of the drive seat according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the surface structure of a pressure plate according to an embodiment of the present invention.

[0021] Figure label: 100. Test base; 110. Gantry frame; 120. Pressure base; 130. Lead screw motor; 111. Sliding guide rod; 131. Lead screw; 200. Pressure drive assembly; 210. Drive base; 220. Main swing arm; 230. Support rod; 240. Deformation force gauge; 211. Dual output motor; 212. Worm shaft; 221. Worm gear; 300. Pressure plate; 310. Pressure sensor array; 320. Millimeter-wave radar. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0023] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0024] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, a device for testing the resilience of a sponge seat cushion.

[0025] Combination Figures 1-6As shown, the present invention provides a sponge cushion resilience testing device, including a testing base 100, a pressure driving assembly 200, and a pressure plate 300. The testing base 100 is an integral load-bearing structure, with a gantry frame 110 fixedly installed on its top surface. A pressure seat 120 is slidably installed on the inner side of the gantry frame 110 via a sliding guide rod 111. The pressure seat 120 can be stably raised and lowered in the vertical direction along the sliding guide rod 111. The pressure driving assembly 200 is fixedly installed on the bottom surface of the pressure seat 120, which is used to support and drive the pressure plate 300 to perform downward pressure and rebound testing actions.

[0026] In this embodiment, the pressure drive assembly 200 includes a drive seat 210, a main swing rod 220, a support rod 230, and a deformation force gauge 240. The drive seat 210 is fixed to the bottom surface of the pressure seat 120. The upper and lower ends of the main swing rod 220 are rotatably connected to the surface of the drive seat 210 and the top end of the support rod 230, respectively. The bottom end of the support rod 230 is movably connected to the top end of the deformation force gauge 240. The deformation force gauge 240 is fixed to the top surface of the pressure plate 300, thereby forming a transmission chain structure composed of the drive seat 210, the main swing rod 220, the support rod 230, and the pressure plate 300, enabling the pressure plate 300 to perform stable downward pressing and rebound release actions under controlled conditions.

[0027] In this embodiment, there are two sets of main swing rods 220 and support rods 230, which are symmetrically arranged on both sides of the drive seat 210 to form a four-bar parallel mechanism structure. Through this symmetrically arranged four-bar mechanism, the pressure plate 300 can always maintain a horizontal posture during the driving process, so that the pressure plate 300 can make a translational movement in the vertical direction throughout the entire downward stroke, achieving parallel and uniform contact with the surface of the sponge cushion, thereby avoiding the tilting or uneven local force problems caused by the traditional single-point drive structure.

[0028] In this embodiment, a dual-output motor 211 is provided inside the drive base 210. The output end of the dual-output motor 211 is connected to a worm shaft 212. The end of the main swing rod 220 is provided with a worm gear 221 that meshes with the worm shaft 212 for transmission. When the dual-output motor 211 drives the worm shaft 212 to rotate, the worm gear 221 drives the main swing rod 220 to deflect, thereby driving the four-bar linkage to move as a whole, realizing the downward or upward movement of the pressure plate 300. At the same time, the worm gear transmission structure has a self-locking characteristic, which enables the pressure plate 300 to be stably maintained in any position, avoiding rebound interference or accidental displacement.

[0029] In this embodiment, the pressure plate 300 is connected to the support rod 230 via a deformation force meter 240. The deformation force meter 240 is used to monitor the total pressure applied by the pressure plate 300 to the sponge cushion in real time and convert the pressure signal into an electrical signal to be output to the control system, thereby realizing closed-loop control of the loading force and providing basic data support for subsequent data fusion.

[0030] In this embodiment, the bottom surface of the pressure plate 300 integrates a pressure sensing array 310 and a millimeter-wave radar 320. The pressure sensing array 310 is a flexible thin-film pressure sensor array or a piezoelectric thin-film array, which is distributed in a matrix on the bottom surface of the pressure plate 300. It is used to collect pressure distribution data of the entire surface of the sponge cushion in real time during the pressing process of the pressure plate 300, and generate a pressure distribution cloud map. By analyzing and calculating the pressure value of each sampling point, the uniformity index of the rebound force of the sponge surface is obtained, thereby reflecting the uniformity of the internal structure of the sponge.

[0031] In this embodiment, the millimeter-wave radar 320 is located at the center or edge of the bottom surface of the pressure plate 300, and its operating frequency is 24GHz to 77GHz. When the pressure plate 300 rises away from the sponge cushion, the millimeter-wave radar 320 performs a non-contact scan of the sponge cushion, reconstructs the three-dimensional shape cloud map of the sponge after rebound through echo signal processing, and further calculates the rebound volume recovery rate and surface wrinkle index, thereby realizing a three-dimensional evaluation of the sponge's rebound performance.

[0032] In this embodiment, the test base 100 is equipped with a lead screw motor 130 at the bottom, and the gantry frame 110 is equipped with a lead screw 131. The lead screw 131 and the pressure seat 120 form a threaded transmission connection. The lead screw motor 130 drives the lead screw 131 to rotate, thereby driving the pressure seat 120 to move up and down along the sliding guide rod 111, realizing the initial height adjustment of the pressure drive component 200 and the pressure plate 300 to adapt to the testing requirements of sponge cushions of different thicknesses.

[0033] In this embodiment, the device further includes a control system, which is electrically connected to the dual-output motor 211, the deformation force meter 240, the pressure sensor array 310, and the millimeter-wave radar 320. The control system is used to control the dual-output motor 211 to drive the pressure plate 300 to perform pressing and releasing actions, and at the same time receive the total pressure data collected by the deformation force meter 240 and the distributed pressure data collected by the pressure sensor array 310. After the pressure plate 300 is released, it receives the three-dimensional shape data collected by the millimeter-wave radar 320, performs fusion processing on the multi-source data, and generates a comprehensive evaluation result of the sponge cushion's resilience.

[0034] In this embodiment, the total pressure data collected by the deformation force gauge 240 is fused and calibrated with the distributed pressure data collected by the pressure sensor array 310. By comparing and analyzing the overall pressure and local pressure, the accuracy and reliability of the measurement results are improved, thereby avoiding measurement errors caused by a single sensing method.

[0035] In another embodiment, based on the above structure, the pressure sensing array 310 can be further configured as a high-density array structure to improve spatial resolution. At the same time, a data analysis algorithm module is introduced into the control system to dynamically analyze the three-dimensional topographic data collected by the millimeter-wave radar 320 and obtain the height change curve during the rebound process, thereby achieving a further evaluation of the dynamic rebound characteristics of the sponge cushion.

[0036] Working principle and usage process of this invention: The working principle of the sponge cushion resilience testing device of the present invention is based on the organic combination of the pantograph-type four-bar parallel drive mechanism and the dual-modal intelligent detection system. The pressure plate 300 is pressed down in absolute parallel through the kinematic characteristics of the mechanical linkage. At the same time, the pressure sensor array 310 and the millimeter-wave radar 320 are integrated to complete the full-process test of "process uniformity detection + instantaneous rebound three-dimensional reconstruction".

[0037] Mechanical drive principle: The main swing arm 220 and support rod 230 (two sets symmetrically arranged) in the pressure drive assembly 200, together with the drive seat 210 and pressure plate 300, form a four-bar linkage (parallelogram mechanism). When the dual-output motor 211 drives the worm gear 221 at the end of the main swing arm 220 to deflect via the worm shaft 212, the support rod 230 moves synchronously, forcing the pressure plate 300 to perform a pure translational motion in the vertical direction, rather than rotation or tilting. Throughout the entire downward stroke, the pressure plate 300 remains horizontal, ensuring full contact and uniform adhesion with the sponge cushion surface. The worm gear drive has a self-locking characteristic, reliably maintaining pressure at any position and avoiding rebound interference. The deformation force gauge 240 converts the total pressure on the pressure plate 300 into an electrical signal in real time for closed-loop adjustment by the control system.

[0038] Detection principle: Pressure sensor array 310: A flexible thin-film pressure sensor array (or piezoelectric thin-film array) is distributed in a matrix on the bottom surface of pressure plate 300. During the pressing process, each unit of the array synchronously collects the micro-area pressure values ​​of the entire surface of the sponge cushion, forming a real-time pressure distribution cloud map. By calculating the local pressure deviation rate, the "sponge surface resilience uniformity index" is obtained, which directly reflects defects such as density gradient, air bubbles, and lumps inside the sponge.

[0039] Millimeter-wave radar 320: Operating frequency 24GHz~77GHz, installed at the center or edge of the bottom surface of pressure plate 300. When pressure plate 300 rapidly rises away from the sponge cushion (≤0.5 seconds), the radar emits millimeter waves non-contactly and receives the echo. Utilizing the Doppler effect and phase difference principle, it reconstructs a 3D rebound morphology cloud map of the sponge, automatically calculating the "rebound volume recovery rate," "surface wrinkle index," and "rebound efficiency curve (height-time)." Millimeter waves have strong penetrating power and are resistant to light interference, making them particularly suitable for porous and reflective sponge materials.

[0040] Cooperative control principle: The control system simultaneously acquires the total pressure from the deformation force gauge 240, the distribution data from the pressure sensor array 310, and the three-dimensional data from the millimeter-wave radar 320, and performs fusion calibration. The lead screw motor 130 drives the lead screw 131 to achieve a large-stroke initial height adjustment of the pressure seat 120, ensuring that sponges of different thicknesses (10-200mm) are in the optimal testing position. The entire system, through the "parallel + rapid release" characteristics of the four-bar linkage, solves the technical problems of easy tilting and large hydraulic synchronization errors in traditional lead screw single-point propulsion, achieving constant force, uniformity, and instantaneous unobstructed resilience testing.

[0041] Usage process The operation of this device consists of the following 8 steps, all of which are automatically completed by the control system. The human-machine interface only requires input of test parameters (pressure value, holding time, seat cushion specifications, etc.), and no manual intervention is required throughout the entire process: Preparation stage: Place the foam cushion to be tested flat on the central worktable of the test machine base 100, turn on the power, and control the system to perform self-tests on the dual-output motor 211, deformation force gauge 240, pressure sensor array 310 and millimeter-wave radar 320.

[0042] Initial height adjustment: The operator or program inputs the seat cushion thickness via the touch screen, and the control system starts the lead screw motor 130, which drives the lead screw 131 to make the pressure seat 120 drive the pressure drive component 200 and the pressure plate 300 to the initial position 5-10mm away from the upper surface of the sponge seat cushion.

[0043] Initiating Pressure Depression: The test program is started, and the dual-output motor 211 rotates forward, driving the main swing arm 220 to deflect via the worm shaft 212. The four-bar linkage drives the pressure plate 300 to press down at a constant speed. The pressure sensor array 310 collects pressure distribution cloud maps in real time and displays the uniformity index; the deformation force gauge 240 monitors the total pressure, and automatically enters the pressure holding stage when the set value (e.g., 50-500N) is reached.

[0044] Pressure holding test: The pressure plate 300 maintains a horizontal constant pressure state for 5 to 30 seconds (adjustable), the pressure sensor array 310 continuously records the changes in the pressure cloud map, and the control system calculates and stores the elasticity index of the sponge during the compression process.

[0045] Rapid release: After the pressure holding ends, the dual-output motor 211 reverses, the main swing arm 220 swings back quickly, and the four-bar linkage drives the pressure plate 300 to completely leave the surface of the sponge cushion within 0.5 seconds, achieving zero-damping instantaneous release and simulating the scenario of a human suddenly standing up.

[0046] Rebound Scan: The moment the pressure plate 300 leaves, the millimeter-wave radar 320 immediately triggers a three-dimensional scan to reconstruct the 3D morphological cloud map of the sponge after rebound, and automatically calculates the rebound volume recovery rate, surface wrinkle index and rebound efficiency curve.

[0047] Data fusion and report generation: The control system fuses and calibrates the total pressure data from the deformation force gauge 240 and the distributed data from the pressure sensor array 310, and combines this with the three-dimensional results from the millimeter-wave radar 320 to generate a comprehensive evaluation report containing the following: 1. Pressure distribution cloud map and uniformity index; 2. 3D rebound topography cloud map; 3. Rebound volume recovery rate, surface wrinkle index, and rebound efficiency curve; 4. Pass / Fail determination (custom thresholds can be set).

[0048] End and Reset: The report is automatically saved and printed / exported. The lead screw motor 130 raises the pressure plate 300 to a safe height, the device resets, the cushion is removed, and the next test cycle begins. The entire single test cycle is ≤2 minutes, suitable for batch testing in laboratories or production lines.

[0049] Technical effects: This invention utilizes the natural parallel motion characteristics of a four-bar linkage, combined with a dual-modal sensor, to achieve "uniform loading across the entire surface + instantaneous unobstructed 3D rebound detection," which is impossible with traditional lead screw / hydraulic drives. This significantly improves the accuracy, consistency, and intelligence of sponge cushion rebound testing.

[0050] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A device for testing the resilience of a sponge seat cushion, characterized in that, It includes a test base (100), a pressure drive assembly (200), and a pressure plate (300). A gantry frame (110) is fixedly installed on the top surface of the test base (100). A pressure seat (120) is slidably installed on the inner side of the gantry frame (110) via a sliding guide rod (111). The pressure drive assembly (200) is fixedly installed on the bottom surface of the pressure seat (120). The pressure drive assembly (200) includes a drive base (210), a main swing rod (220), a support rod (230), and a deformation force gauge (240). The upper and lower ends of the main swing rod (220) are rotatably connected to the surface of the drive base (210) and the top end of the support rod (230), respectively. The bottom end of the support rod (230) is movably connected to the top end of the deformation force gauge (240). The deformation force gauge (240) is fixed to the top surface of the pressure plate (300). A dual-output motor (211) is provided inside the drive base (210). The dual-output motor (211) drives the main swing rod (220) to deflect through a worm shaft (212). The pressure plate (300) has a pressure sensor array (310) and a millimeter-wave radar (320) integrated on its bottom surface.

2. The device for testing the resilience of a sponge cushion according to claim 1, characterized in that, The pressure sensing array (310) is a flexible thin film pressure sensor array or a piezoelectric thin film array, which is distributed in a matrix on the bottom surface of the pressure plate (300) to collect the pressure distribution cloud map of the entire surface of the sponge cushion in real time during the pressing process, and to calculate the uniformity index of the rebound force of the sponge surface.

3. The device for testing the resilience of a sponge seat cushion according to claim 1, characterized in that, The millimeter-wave radar (320) is located in the center or edge area of ​​the bottom surface of the pressure plate (300) and operates at a frequency of 24GHz-77GHz. It is used to perform non-contact three-dimensional scanning of the sponge cushion at the moment when the pressure plate (300) rises away from the sponge cushion, reconstruct the 3D shape cloud map after rebound, and calculate the rebound volume recovery rate and surface wrinkle index.

4. The device for testing the resilience of a sponge cushion according to claim 1, characterized in that, The main swing rod (220) and the support rod (230) are in two sets and are symmetrically arranged on both sides of the drive seat (210) to form a four-bar linkage mechanism, so that the pressure plate (300) remains horizontal throughout the entire downward stroke, and achieves parallel and uniform contact between the pressure plate (300) and the surface of the sponge cushion.

5. The device for testing the resilience of a sponge cushion according to claim 1, characterized in that, The main swing arm (220) is provided with a worm gear (221) at its end, and the output end of the dual-output motor (211) is connected to a worm shaft (212) that meshes with the worm gear (221) for transmission, so as to realize the precise deflection and self-locking of the main swing arm (220).

6. The device for testing the resilience of a sponge seat cushion according to claim 1, characterized in that, The test base (100) is equipped with a lead screw motor (130) at the bottom. The gantry frame (110) is equipped with a sliding guide rod (111) and a lead screw (131) fixed to the output end of the lead screw motor (130). The lead screw (131) is connected to the pressure seat (120) for driving the entire pressure drive assembly (200) and pressure plate (300) to perform initial height adjustment.

7. The device for testing the resilience of a sponge cushion according to claim 1, characterized in that, The device also includes a control system, which is electrically connected to a dual-output motor (211), a deformation force meter (240), a pressure sensor array (310), and a millimeter-wave radar (320), respectively. It can realize real-time monitoring of pressure distribution during the pressing process, reconstruction of 3D rebound shape after instantaneous release of the pressure plate, and generation of a comprehensive evaluation report on the resilience of the sponge cushion.

8. The device for testing the resilience of a sponge cushion according to claim 1, characterized in that, The pressure plate (300) is connected to the support rod (230) via a deformation force meter (240). The deformation force meter (240) is used to monitor the total pressure applied by the pressure plate (300) to the sponge cushion in real time and to fuse and calibrate the distributed pressure data collected by the pressure sensor array (310).

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