Pressure resistance detection device and method based on plastic tray

Abstract

The invention discloses a pressure resistance and resistance detection device and method based on a plastic tray, and relates to the technical field of pressure resistance and resistance detection devices.The pressure resistance and resistance detection device comprises a detection sealing shell and the plastic tray, a supporting frame is arranged at the bottom of the detection sealing shell, and a temperature control box used for simulating a high-temperature storage environment is arranged on one side of the detection sealing shell; a pressure distribution mechanism is arranged at the upper end of the supporting frame. The supporting legs of the plastic tray are arranged at the upper end of the supporting plate, a weight is applied to the upper end of the supporting plate to simulate the stacking load, meanwhile, the temperature control box is used for regulating and detecting the internal temperature of the sealing shell, and high-fidelity reproduction of the real use working condition of the plastic tray in the high-temperature or low-temperature environment is achieved; load is transmitted to the supporting plate through the supporting legs and then acts on the inclined pulling plate, the inclined pulling plate is installed in the inclined groove in a sliding mode through the inclined sliding block and matched with the surface of the triangular block, and the uneven stress state under the non-ideal conditions such as uneven ground, supporting leg suspension or foreign matter interference is simulated.

Description

Technical Field

[0001] This invention relates to the field of pressure resistance testing devices, and particularly to a pressure resistance testing device and method based on a plastic pallet. Background Technology

[0002] For example, patent CN117367991B, entitled "A Mechanical Strength Testing Device for Plastic Pallets," includes a strength testing system for testing the strength of pallets, a base, a lifting device on one side of the base to lift the pallet, a support on the upper side of the base, and a pressure component and a pressure plate assembly slidably mounted on the support. The pressure plate assembly is located below the output end of the pressure component, and the pressure component applies pressure to the pallet through the pressure plate assembly. A pressure column is movably mounted below the pressure plate assembly, and the pressure plate assembly can extend and retract along its length. This invention provides a mechanical strength testing device for plastic pallets, capable of testing pallets for compressive strength, impact resistance, and shock resistance, reducing the workload of pallet testing and improving testing efficiency.

[0003] The aforementioned detection devices typically apply a uniform load to plastic pallets on a flat, rigid support surface, measuring only the total load-bearing capacity or center settlement. This ignores complex stress conditions in actual logistics environments, such as asymmetry, eccentricity, or localized suspension caused by uneven ground, foreign objects, or suspended support legs. It also makes it difficult to identify stress concentrations or structural weaknesses in key nodes and areas at the bottom of the pallet. Furthermore, plastic pallets are prone to micron-level localized collapses or support tilting under high-temperature softening or long-term loads. Such nonlinear and asymmetric deformations often exceed the sensing capabilities of traditional sensors. Actual failures often begin with localized surface collapse at the base of the support legs or at the grid connection, rather than simply sinking at the center of the support. Therefore, this application provides a pressure resistance detection device and method based on plastic pallets to meet these requirements. Summary of the Invention

[0004] The purpose of this application is to provide a pressure resistance testing device and method based on plastic pallets, which can effectively solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this application provides the following technical solution: a pressure resistance testing device based on a plastic pallet, comprising a testing shell and a plastic pallet, wherein a support frame is provided at the bottom of the testing shell, and a temperature control box for simulating a high-temperature storage environment is provided on one side of the testing shell; The upper end of the support frame is equipped with a pressure distribution mechanism for detecting the pressure distribution status at key nodes of the plastic pallet. The bottom of the testing enclosure is supported by legs on both sides, and the upper end of the legs is equipped with a load-bearing mechanism for placing a plastic tray. Both sides of the load-bearing mechanism are equipped with deformation testing mechanisms to monitor the deformation of the plastic pallet support legs during the loading process in real time. The upper four corners of the load-bearing mechanism are equipped with local collapse detection mechanisms to detect local collapse of the plastic pallet under stacking load. The local collapse detection mechanism includes: The fulcrum detection component is used to detect the pressure borne by various support fulcrums at the bottom of a plastic pallet. Four local deformation detection components are arranged in a ring array around the fulcrum detection component to simultaneously detect the degree of local stress deformation of the plastic pallet in the area surrounding the fulcrum.

[0006] The load-bearing mechanism includes a pallet frame, which is set on the upper end of the leg support. The pallet frame has a load-bearing plate inside, and a central groove is opened in the middle of the load-bearing plate. Two rectangular grooves are symmetrically arranged on both sides of the upper end of the load-bearing plate. Side plates are provided on both sides of the pallet frame. The plastic pallet is placed on the upper end of the load-bearing plate and the pallet frame.

[0007] The deformation testing mechanism includes a triangular block and a support plate. The triangular block is fixedly installed on the upper end of the side plate. A groove is provided on one side of the triangular block. A slanted pull plate is provided at the lower end of the support plate, and a slanted slider is provided at the bottom of one side of the slanted pull plate. The slanted slider is slidably installed inside the groove.

[0008] The triangular block and the inclined plate have triangular cross sections. The inclined plate has an inner groove, and each inner groove has a number of first tension sensors that are evenly distributed. Each first tension sensor has a tension band inside, and one end of the tension band is connected to one side of the pallet frame.

[0009] The pressure distribution mechanism includes a base frame, which is fixedly installed on the upper end of a support frame. A base is provided on the upper end of the base frame, and slide rails are provided on both sides of the base. Two weighing frames are symmetrically slidably installed on the upper ends of the two slide rails. A telescopic rod is provided on one side of each of the two weighing frames, and one end of the telescopic rod is installed on the upper end of the base.

[0010] The weighing frame has a mounting bracket at its upper end, and a second pressure detection device at its upper end. Both second pressure detection devices pass through a rectangular groove, and a distribution plate is provided at the upper end of both second pressure detection devices. The distribution plate abuts against the lower end of the plastic tray. A first pressure detection device is provided at the upper center of the base, and the first pressure detection device is located inside the central groove and contacts the support foot at the bottom of the plastic tray. Two detection rods are symmetrically arranged on one side of the weighing frame, and a connecting piece is provided at the upper end of each of the two detection rods.

[0011] The fulcrum detection assembly includes a round rod and a fulcrum plate. The round rod is fixedly installed on the upper end of the connector, and a connecting seat is provided at the upper end of the round rod. A ball shaft is provided in the middle of the bottom wall of the fulcrum plate. The fulcrum plate is movably installed inside the connecting seat through the ball shaft. Several pressure sensors arranged in a ring array are provided at the bottom of the fulcrum plate.

[0012] The outer surface of the fulcrum plate is provided with four detection ropes arranged in a circular array, and a second tension sensor is provided in the middle of the detection ropes. The outer surface of the connecting seat is provided with four shaft blocks arranged in a circular array, and a side rod is rotatably installed inside the shaft blocks.

[0013] The local deformation detection component includes a mounting frame rotatably mounted on one end of a side rod. Both ends of the mounting frame are provided with support plates, and one end of the support plate is connected to a detection rope. The upper end of the mounting frame has a mounting groove, and a strip is provided inside the mounting groove. A wire hole is provided on one side of the mounting frame, and a third tension sensor is provided at the bottom of the mounting frame. One end of the strip passes through the wire hole and is connected to the third tension sensor.

[0014] The present invention also provides a method for testing the compressive strength of plastic pallets, the specific compressive strength testing method being as follows: Install the load-bearing mechanism on the upper end of the scaffold support, place the plastic pallet on the upper end of the load-bearing mechanism, and ensure that the support legs on both sides of the bottom of the plastic pallet are accurately aligned and placed on the upper end of the deformation testing mechanism in order to monitor the deformation state of the support legs. Adjusting the position of the pressure distribution mechanism synchronously moves the fulcrum detection component to the corresponding support fulcrum position at the bottom of the plastic pallet, so that the pressure distribution mechanism establishes contact with the key nodes at the bottom of the plastic pallet, and the fulcrum detection component is distributed at each support point at the bottom of the plastic pallet; A load is applied to the top of the plastic pallet, and the temperature inside the casing is controlled by a temperature control box to simulate a high-temperature storage environment. A pressure distribution mechanism detects the pressure distribution at key nodes of the plastic pallet under simulated stacking conditions. A fulcrum detection component works with the pressure distribution mechanism to detect the pressure value borne by each support point in real time. At the same time, four local deformation detection components set around the fulcrum detection component synchronously detect the degree of deformation of the plastic pallet caused by local stress concentration in the area around the fulcrum.

[0015] In summary, the technical effects and advantages of this invention are as follows: 1. This invention achieves high-fidelity reproduction of the actual use conditions of plastic pallets under high or low temperature environments by placing the support feet of the plastic pallet on the upper part of the support plate and applying a heavy object to the upper part to simulate the stacking load. At the same time, the internal temperature of the sealed shell is controlled and detected by a temperature control box. The load is transferred to the support plate through the support feet and then acts on the inclined plate. The inclined plate is slidably installed in the inclined groove through the inclined slider and cooperates with the surface of the triangular block, simulating the uneven force state under non-ideal conditions such as uneven ground, suspended support feet or foreign object interference.

[0016] 2. This invention achieves accurate monitoring of the core load-bearing point under stacking load by placing a plastic pallet on the upper part of the load-bearing plate and pallet frame, and using a first pressure detection device to extend into the central groove to contact the bottom center area. At the same time, a second pressure detection device is embedded in the rectangular groove through a distribution plate to contact the bottom surface of the plastic pallet, and can simultaneously acquire force data of multiple areas, effectively reflecting the overall pressure distribution characteristics.

[0017] 3. This invention precisely places the fulcrum plate against the support point at the bottom of the plastic pallet. Under stacking load, when the plastic pallet deforms and squeezes the fulcrum plate, the pressure sensors distributed in a ring array at its bottom can capture multi-directional pressure changes in real time, accurately reflecting the uneven load distribution in the fulcrum area. At the same time, the fulcrum plate is supported on the upper end of the connecting seat by a ball shaft, allowing it to rotate freely with an inclination of no more than 5° when subjected to force eccentricity or local collapse. This simulates the change in support posture caused by pallet deformation in the actual logistics environment. During this process, the slight tilt of the fulcrum plate will pull the detection rope, causing it to stretch or relax, which is collected in real time by the second tension sensor, thereby quantifying the displacement and load offset caused by fulcrum collapse.

[0018] 4. This invention provides support plates around the fulcrum plate, which simultaneously abut against the bottom support fulcrum of the plastic pallet and conform to its surrounding bottom plane. This enables the detection of the core area of ​​the fulcrum and the adjacent plane area. When the plastic pallet partially collapses and forms a curved surface under load, the collapsed area compresses the inner strip, which is constrained in the mounting groove and connected to the third tension sensor. Its stretching can be accurately captured by the third tension sensor, thereby quantitatively reflecting the degree of collapse of the plane surrounding the support fulcrum of the fulcrum plate. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1A first-view three-dimensional structural diagram of the pressure resistance testing device for plastic pallets; Figure 2 This is a second-view three-dimensional structural diagram of the pressure resistance testing device for plastic pallets; Figure 3 A third-view sectional view of the connection structure of the pressure resistance testing device for plastic pallets; Figure 4 A schematic diagram of the three-dimensional connection structure of the plastic pallet, the load-bearing mechanism, and the pressure distribution mechanism; Figure 5 A schematic diagram of the three-dimensional connection structure of the load-bearing mechanism, deformation testing mechanism, pressure distribution mechanism, and local collapse detection mechanism; Figure 6 A first-person perspective three-dimensional connection structure diagram of the pressure distribution mechanism; Figure 7 A second-view three-dimensional connection structure diagram of the pressure distribution mechanism; Figure 8 This is a schematic diagram of the three-dimensional connection structure of the pressure distribution mechanism from a third-person perspective. Figure 9 A schematic diagram of the three-dimensional connection structure of the plastic tray and the second pressure detection device; Figure 10 A first-person perspective three-dimensional connection structure diagram of the load-bearing mechanism; Figure 11 A schematic diagram of the three-dimensional connection structure of the load-bearing mechanism from a second-view perspective. Figure 12 This is a schematic diagram of the three-dimensional connection structure of the deformation testing mechanism; Figure 13 This is a schematic diagram of the three-dimensional connection structure of the inclined plate; Figure 14 This is a sectional view of the three-dimensional connection structure of the inclined plate; Figure 15 This is a schematic diagram of the three-dimensional connection structure of the first tension sensor; Figure 16 This is a schematic diagram of the three-dimensional connection structure of the local collapse detection mechanism; Figure 17 This is a schematic diagram of the local three-dimensional connection structure of the local collapse detection mechanism; Figure 18 An exploded view of the three-dimensional connection structure of the local collapse detection mechanism; Figure 19 A schematic diagram of the three-dimensional connection structure of the fulcrum detection component; Figure 20 This is a schematic diagram of the three-dimensional connection structure of the local deformation detection component; Figure 21 This is a three-dimensional cross-sectional view of the connection structure of the local deformation detection component.

[0021] In the diagram: 1. Temperature control box; 2. Detection enclosure; 3. Support frame; 4. Plastic pallet; 5. Load-bearing mechanism; 51. Pallet frame; 52. Load-bearing plate; 53. Rectangular groove; 54. Central groove; 55. Side plate; 6. Deformation testing mechanism; 61. Support plate; 62. Inclined tie plate; 63. Triangular block; 64. Inclined groove; 65. Inner groove; 66. Inclined slider; 67. First tensile sensor; 68. Tension band; 7. Pressure distribution mechanism; 70. Base; 71. Base frame; 72. Weighing frame; 73. Detection rod; 74. Connector; 75. Telescopic rod; 76. First pressure detection device; 77. Mounting bracket; 78. Second pressure detection device; 79. Distribution plate; 711. Slide rail; 8. Local collapse detection mechanism; 81. Fusel detection assembly; 811. Round rod; 812. Shaft block; 813. Side rod; 814. Detection rope; 815. Second tension sensor; 816. Fusel plate; 817. Connecting seat; 818. Ball shaft; 819. Pressure sensor; 82. Local deformation detection assembly; 821. Support plate; 822. Mounting frame; 823. Mounting groove; 824. Strip belt; 825. Third tension sensor; 826. Wire hole; 9. Leg support. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1, Reference Figures 1 to 21 The pressure resistance testing device based on a plastic pallet shown includes a testing shell 2 and a plastic pallet 4. A support frame 3 is provided at the bottom of the testing shell 2, and a temperature control box 1 for simulating a high-temperature storage environment is provided on one side of the testing shell 2. The upper end of the support frame 3 is equipped with a pressure distribution mechanism 7, which is used to detect the pressure distribution status at key nodes of the plastic tray 4; Both sides of the bottom of the test cover 2 are equipped with leg supports 9, and the upper end of the leg supports 9 is equipped with a load-bearing mechanism 5 for placing the plastic tray 4. Both sides of the load-bearing mechanism 5 are equipped with deformation testing mechanisms 6, which are used to monitor the deformation of the plastic pallet 4 support legs during the loading process in real time. Local collapse detection mechanisms 8 are provided at the four corners of the upper end of the load-bearing mechanism 5 to detect local collapse of the plastic pallet 4 under stacking load. Among them, the 8 local collapse detection agencies include: The fulcrum detection component 81 is used to detect the pressure borne by the support fulcrums at various points on the bottom of the plastic pallet 4. Four local deformation detection components 82 are arranged in a ring array around the fulcrum detection component 81 to simultaneously detect the degree of local force deformation of the plastic tray 4 in the area surrounding the fulcrum.

[0024] It is worth noting that the load-bearing mechanism 5 is installed on the upper end of the leg support 9, and then the plastic tray 4 is placed on the upper end of the load-bearing mechanism 5. During the placement process, it is necessary to ensure that the support legs on both sides of the bottom of the plastic tray 4 are accurately aligned and placed on the upper end of the deformation testing mechanism 6, so as to realize real-time monitoring of the deformation state of the support legs.

[0025] By precisely placing the plastic pallet 4 on the load-bearing mechanism 5 and placing its bottom two support feet on the upper end of the deformation testing mechanism 6, the deformation behavior of the support feet under stacking load is directly detected, avoiding the masking of the response of local weak points by the overall loading method. In particular, it can capture unilateral or asymmetrical deformation caused by manufacturing defects, uneven materials or uneven support surfaces, significantly improving the ability to identify the failure risk of key stress parts in the actual use of the plastic pallet 4.

[0026] Adjust the position of the pressure distribution mechanism 7 to make it contact the key node area at the bottom of the plastic pallet 4, thereby detecting the pressure distribution state of the plastic pallet 4 at the key node under simulated stacking conditions.

[0027] During the position adjustment of the pressure distribution mechanism 7, the fulcrum detection component 81 is simultaneously moved to the corresponding support fulcrum position at the bottom of the plastic pallet 4. The fulcrum detection component 81 is distributed at each support point at the bottom of the plastic pallet 4 to cooperate with the pressure distribution mechanism 7 to detect the pressure value borne by each support point in real time. At the same time, four local deformation detection components 82 surrounding the fulcrum detection component 81 simultaneously detect the degree of minute deformation of the plastic tray 4 in the area around the fulcrum due to local stress concentration. It is worth noting that the pressure distribution mechanism 7 can dynamically adjust its position and contact the key nodes at the bottom of the plastic tray 4, and simultaneously drive the fulcrum detection component 81 to move to the corresponding support fulcrum, thereby realizing the fixed-point detection of the pressure value of each support point. Meanwhile, the four local deformation detection components 82 arranged around the fulcrum detection component 81 work together to sensitively capture the collapse or warping caused by stress concentration in the area around the fulcrum, reflecting not only the overall load-bearing performance but also focusing on the local mechanical response.

[0028] Finally, a load is applied to the top of the plastic pallet 4, and then the temperature inside the detection shell 2 is controlled by the temperature control box 1 to simulate a high-temperature storage environment.

[0029] Furthermore, by applying a load to the top of the plastic pallet 4 and activating the temperature control box 1 to regulate the internal temperature of the detection enclosure 2, the stacking conditions under high-temperature storage or transportation environments can be accurately simulated, making the test results closer to actual application scenarios.

[0030] Example 2: This example provides further technical solutions for the load-bearing mechanism 5 and the deformation testing mechanism 6.

[0031] The load-bearing mechanism 5 includes a pallet frame 51, which is set on the upper end of the leg support 9. The pallet frame 51 has a load-bearing plate 52 inside, and a central groove 54 is opened in the middle of the load-bearing plate 52. Two rectangular grooves 53 are symmetrically arranged on both sides of the upper end of the load-bearing plate 52. Side plates 55 are provided on both sides of the pallet frame 51. The plastic pallet 4 is placed on the upper end of the load-bearing plate 52 and the pallet frame 51.

[0032] The deformation testing mechanism 6 includes a triangular block 63 and a support plate 61. The triangular block 63 is fixedly installed on the upper end of the side plate 55. A groove 64 is provided on one side of the triangular block 63. A slanted pull plate 62 is provided at the lower end of the support plate 61. A slanted slider 66 is provided at the bottom of one side of the slanted pull plate 62. The slanted slider 66 is slidably installed inside the groove 64.

[0033] Both the triangular block 63 and the inclined plate 62 have triangular cross sections. The inclined plate 62 has an inner groove 65 inside. Several first tension sensors 67 are arranged at equal intervals inside the inner groove 65. The first tension sensor 67 has a tension band 68 inside, and one end of the tension band 68 is connected to one side of the pallet frame 51.

[0034] It is worth noting that when conducting the pressure resistance test, the support feet of the plastic pallet 4 are first placed on the upper end of the support plate 61. Then, a heavy object is applied to the upper end of the plastic pallet 4 to simulate the stacking load. At the same time, the internal ambient temperature of the test shell 2 is adjusted by the temperature control box 1 so that the plastic pallet 4 can be tested for pressure resistance under high temperature or low temperature conditions, thereby truly replicating its stress state in extreme storage or transportation environments. When the load is applied to the upper part of the plastic pallet 4, its bottom support foot will transfer the load-bearing pressure to the support plate 61, and then act on the inclined plate 62 below. The inclined plate 62 is slidably installed in the inclined groove 64 through the inclined slider 66 and makes contact with the surface of the triangular block 63. This structure is designed to simulate the uneven force on the support foot caused by factors such as uneven ground, suspended support foot or foreign objects during actual stacking. Under load, the inclined plate 62 slides along the surface of the triangular block 63, causing the bottom support leg of the plastic pallet 4 to undergo asymmetrical deformation. At this time, the first tension sensor 67 installed inside the inner groove 65 can detect the change in tension on the tension band 68 in real time. Since the force transmitted from each support leg to the corresponding inclined plate 62 is different when the plastic pallet 4 is pressed in different directions, the tension value of the tension band 68 measured by each first tension sensor 67 is also different, thereby realizing a quantitative assessment of the local deformation state of the support leg of the plastic pallet 4 and its overall flat plate load-bearing capacity. When it is necessary to conduct a pressure resistance test on the plastic pallet 4 under all-round and uniform support conditions, the inclined plate 62 can be fixed in a preset position in the inclined groove 64 by wedges to restrict its sliding freedom, so that the support plate 61 remains horizontal and stable, thereby ensuring that the plastic pallet 4 is in a flat and symmetrical loading state to complete the comprehensive performance test under standard working conditions.

[0035] Among them, by placing the support feet of the plastic pallet 4 on the upper end of the support plate 61 and applying a heavy object to the upper end to simulate the stacking load, while using the temperature control box 1 to regulate and detect the internal temperature of the sealing shell 2, a high-fidelity reproduction of the actual use conditions of the plastic pallet 4 under high or low temperature environments is achieved. The load is transmitted to the support plate 61 via the support foot and then acts on the inclined plate 62. The inclined plate 62 is slidably installed in the inclined groove 64 through the inclined slider 66 and cooperates with the surface of the triangular block 63, simulating the uneven force state under non-ideal conditions such as uneven ground, suspended support foot or foreign object interference.

[0036] Example 3: This example provides a further solution for the pressure distribution mechanism 7.

[0037] The pressure distribution mechanism 7 includes a base frame 71, which is fixedly installed on the upper end of the support frame 3. A base 70 is provided on the upper end of the base frame 71, and slide rails 711 are provided on both sides of the base 70. Two weighing frames 72 are symmetrically slidably installed on the upper ends of the two slide rails 711. A telescopic rod 75 is provided on one side of each of the two weighing frames 72, and one end of the telescopic rod 75 is installed on the upper end of the base 70.

[0038] The weighing frame 72 is provided with a mounting bracket 77 at its upper end, and a second pressure detection device 78 is provided at the upper end of the mounting bracket 77. Both second pressure detection devices 78 pass through the rectangular groove 53. The upper ends of the two second pressure detection devices 78 are provided with a distribution plate 79, and the distribution plate 79 abuts against the lower end of the plastic tray 4. A first pressure detection device 76 is provided in the middle of the upper end of the base 70, and the first pressure detection device 76 is located inside the central groove 54 and contacts the support foot at the bottom of the plastic tray 4. Two detection rods 73 are symmetrically arranged on one side of the weighing frame 72, and a connecting piece 74 is provided at the upper end of each of the two detection rods 73.

[0039] It is worth noting that during the testing process, the plastic pallet 4 is first placed on the upper end of the load-bearing plate 52 and the pallet frame 51. Then, the first pressure testing device 76 extends vertically into the center groove 54 and touches the middle of the bottom of the plastic pallet 4 to test the load-bearing status of its central area under the stacking load. Meanwhile, the second pressure detection device 78 is set inside the rectangular groove 53 and contacts the bottom of the plastic pallet 4 through the distribution plate 79, so as to realize the synchronous detection of the force on multiple areas of the bottom surface of the plastic pallet 4, thereby obtaining its overall pressure distribution characteristics. Furthermore, the telescopic rod 75 is used to drive the weighing frame 72 to slide horizontally along the slide rail 711; the movement of the weighing frame 72 causes the mounting frame 77 and the second pressure detection device 78 to move synchronously, thereby performing pressure detection at different lateral positions on the bottom of the plastic pallet 4 point by point, and evaluating its pressure distribution under load.

[0040] In addition, the weighing frame 72 also drives the detection rod 73 to move synchronously during the movement. The detection rod 73 is connected to the local collapse detection mechanism 8 through the connector 74, thereby driving the local collapse detection mechanism 8 to move along the bottom of the plastic pallet 4, so that it can detect each support point area in turn and monitor the local collapse deformation of the plastic pallet 4 under the stacking load in real time.

[0041] It is worth noting that by placing the plastic pallet 4 on the upper part of the load-bearing plate 52 and the pallet frame 51, and using the first pressure detection device 76 to extend into the center groove 54 to contact the bottom center area, accurate monitoring of the core load-bearing point under the stacking load is achieved. At the same time, the second pressure detection device 78 contacts the bottom surface of the plastic pallet 4 through the distribution plate 79 and is embedded in the rectangular groove 53, which can simultaneously acquire the force data of multiple areas and effectively reflect the overall pressure distribution characteristics.

[0042] Example 4: This example provides further technical solutions for the fulcrum detection component 81 and the local deformation detection component 82 in the local collapse detection mechanism 8.

[0043] The fulcrum detection assembly 81 includes a round rod 811 and a fulcrum plate 816. The round rod 811 is fixedly installed on the upper end of the connector 74. A connector seat 817 is provided at the upper end of the round rod 811. A ball shaft 818 is provided in the middle of the bottom wall of the fulcrum plate 816. The fulcrum plate 816 is movably installed inside the connector seat 817 through the ball shaft 818. Several pressure sensors 819 arranged in a ring array are provided at the bottom of the fulcrum plate 816.

[0044] The outer surface of the fulcrum plate 816 is provided with four detection ropes 814 arranged in a circular array, and a second tension sensor 815 is provided in the middle of the detection ropes 814. The outer surface of the connecting seat 817 is provided with four shaft blocks 812 arranged in a circular array, and a side rod 813 is rotatably installed inside the shaft block 812.

[0045] It is worth noting that when detecting the local collapse of the plastic pallet 4 under stacking load, the fulcrum plate 816 abuts against the bottom support fulcrum of the plastic pallet 4. When the plastic pallet 4 deforms after bearing the load, its bottom structure will press down on the fulcrum plate 816. The bottom of the fulcrum plate 816 is provided with pressure sensors 819 arranged in a ring array to sense the changes in pressure in all directions in real time. At the same time, the fulcrum plate 816 is supported on the upper end of the connecting seat 817 by a ball shaft 818. The ball shaft 818 allows the fulcrum plate 816 to rotate freely with an inclination of no more than 5° when the force is uneven, thereby simulating the changes in the fulcrum posture caused by local collapse or uneven support surface in actual stacking. When the fulcrum plate 816 tilts due to the partial collapse of the plastic pallet 4, the detection rope 814 connected to it will be subjected to a corresponding tensile or slack force. The change of this force is collected in real time by the second tension sensor 815 to determine the actual load and degree of collapse borne by the corresponding support fulcrum. By combining the multi-point pressure data of the pressure sensor 819 with the tension feedback of the second tension sensor 815, multi-dimensional detection of the mechanical response and deformation state of a single support fulcrum area of ​​the plastic pallet 4 can be achieved.

[0046] Among them, by precisely contacting the support plate 816 against the support point at the bottom of the plastic pallet 4, when the plastic pallet 4 deforms and squeezes the support plate 816 under the stacking load, the pressure sensors 819 distributed in the ring array at the bottom can capture multi-directional pressure changes in real time and accurately reflect the uneven load distribution in the support area. Meanwhile, the fulcrum plate 816 is supported on the upper end of the connecting seat 817 by the ball shaft 818, allowing it to rotate freely with an inclination of no more than 5° when subjected to eccentric force or local collapse. This simulates the change in support posture caused by pallet deformation in the actual logistics environment. During this process, the slight tilt of the fulcrum plate 816 will pull the detection rope 814, causing it to stretch or relax, which is collected in real time by the second tension sensor 815, thereby quantifying the displacement and load offset caused by the collapse of the fulcrum.

[0047] The local deformation detection component 82 includes a mounting frame 822 rotatably mounted on one end of a side rod 813. Support plates 821 are provided at both ends of the mounting frame 822, and one end of the support plate 821 is connected to the detection rope 814. A mounting groove 823 is provided at the upper end of the mounting frame 822, and a strip 824 is provided inside the mounting groove 823. A wire hole 826 is provided on one side of the mounting frame 822, and a third tension sensor 825 is provided at the bottom of the mounting frame 822. One end of the strip 824 passes through the wire hole 826 and is connected to the third tension sensor 825.

[0048] When the fulcrum plate 816 abuts against each support fulcrum at the bottom of the plastic pallet 4, the support plate 821 surrounding it simultaneously adheres to the bottom plane of the plastic pallet 4. When the plastic pallet 4 collapses locally under load, its bottom surface exhibits curved bending deformation, and the collapsed area will compress the strip 824 located inside the support plate 821. The strip 824 is set inside the mounting groove 823 and connected to the third tension sensor 825. When the bottom plane of the plastic tray 4 collapses, the strip 824 is stretched. The third tension sensor 825 can quantitatively assess the degree of plane collapse in the area around the support point corresponding to the current support plate 816 by detecting the amount of stretching. Meanwhile, the support piece 821 is fixed to the mounting frame 822. When the bottom of the plastic tray 4 deforms, the mounting frame 822 is subjected to force and rotates around one end of the side rod 813. The side rod 813 is rotatably mounted inside the shaft block 812, so that the entire support piece 821 can swing or shift slightly with the local curvature change of the bottom surface of the plastic tray 4, thereby maintaining dynamic contact with the collapsed surface.

[0049] During this process, the movement of the support plate 821 will affect the detection rope 814 linked to it, causing the detection rope 814 to be stretched or relaxed accordingly. This mechanical change is collected in real time by the second tension sensor 815, which is used to comprehensively judge the overall deformation state of the support point corresponding to the fulcrum plate 816 and its surrounding area after bearing the load.

[0050] Among them, by setting support plates 821 around the support plate 816, it can simultaneously conform to the bottom plane of the plastic pallet 4 while abutting against the bottom support support point, thereby realizing the detection of the core area of ​​the support point and the adjacent plane area. When the plastic pallet 4 collapses locally under the load and forms a curved surface, the collapsed area squeezes the inner strip 824, and the strip 824 is constrained in the mounting groove 823 and connected to the third tension sensor 825. Its stretching can be accurately captured by the third tension sensor 825, thereby quantitatively reflecting the degree of collapse of the plane around the support support point of the support plate 816. Meanwhile, the support piece 821 is linked to the side rod 813 through the mounting frame 822. The side rod 813 is rotatably located inside the shaft block 812, so that the support piece 821 can swing or move slightly with the local curvature change of the bottom surface of the plastic tray 4, and always maintain dynamic fit. During this process, the displacement of the support piece 821 further pulls the detection rope 814, causing its tension change, which is collected in real time by the second tension sensor 815. Combined with the data of the third tension sensor 825, the problems of non-uniform deformation, edge warping and micro-area failure of the plastic tray 4 are detected.

[0051] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pressure resistance testing device based on a plastic tray, comprising a testing cover (2) and a plastic tray (4), wherein a support frame (3) is provided at the bottom of the testing cover (2), characterized in that: A temperature control box (1) for simulating a high-temperature storage environment is provided on one side of the detection enclosure (2). The upper end of the support frame (3) is provided with a pressure distribution mechanism (7) for detecting the pressure distribution status at key nodes of the plastic tray (4). The bottom sides of the detection enclosure (2) are provided with leg supports (9), and the upper end of the leg supports (9) is provided with a load-bearing mechanism (5) for placing the plastic tray (4). Both sides of the load-bearing mechanism (5) are equipped with deformation testing mechanisms (6) for real-time monitoring of the deformation of the plastic pallet (4) support legs during the loading process; The load-bearing mechanism (5) is equipped with a local collapse detection mechanism (8) at each of the four upper corners, which is used to detect the local collapse of the plastic pallet (4) under the stacking load. The local collapse detection mechanism (8) includes: The fulcrum detection component (81) is used to detect the pressure borne by the support fulcrums at various points on the bottom of the plastic pallet (4); Four local deformation detection components (82) are arranged in a ring array around the fulcrum detection component (81) to simultaneously detect the degree of local stress deformation of the plastic tray (4) in the area around the fulcrum.

2. The pressure resistance testing device based on a plastic pallet according to claim 1, characterized in that: The load-bearing mechanism (5) includes a pallet frame (51), which is located on the upper end of the leg support (9). The pallet frame (51) has a load-bearing plate (52) inside. The load-bearing plate (52) has a central groove (54) in the middle. The upper end of the load-bearing plate (52) has two rectangular grooves (53) symmetrically arranged on both sides. The pallet frame (51) has side plates (55) on both sides. The plastic pallet (4) is placed on the upper end of the load-bearing plate (52) and the pallet frame (51).

3. The pressure resistance testing device based on a plastic pallet according to claim 2, characterized in that: The deformation testing mechanism (6) includes a triangular block (63) and a support plate (61). The triangular block (63) is fixedly installed on the upper end of the side plate (55). A groove (64) is provided on one side of the triangular block (63). A slanted pull plate (62) is provided at the lower end of the support plate (61), and a slanted slider (66) is provided at the bottom of one side of the slanted pull plate (62). The slanted slider (66) is slidably installed inside the groove (64).

4. The pressure resistance testing device based on a plastic pallet according to claim 3, characterized in that: The cross-sections of the triangular block (63) and the inclined plate (62) are both triangular. The inclined plate (62) has an inner groove (65) inside. The inner groove (65) is provided with several first tension sensors (67) that are evenly distributed inside. The first tension sensor (67) is provided with a tension band (68) inside, and one end of the tension band (68) is connected to one side of the pallet frame (51).

5. The pressure resistance testing device based on a plastic pallet according to claim 1, characterized in that: The pressure distribution mechanism (7) includes a base frame (71), which is fixedly installed on the upper end of the support frame (3). A base (70) is provided on the upper end of the base frame (71), and slide rails (711) are provided on both sides of the base (70). Two weighing frames (72) are symmetrically slidably installed on the upper ends of the two slide rails (711). A telescopic rod (75) is provided on one side of each of the two weighing frames (72), and one end of the telescopic rod (75) is installed on the upper end of the base (70).

6. The pressure resistance testing device based on a plastic pallet according to claim 5, characterized in that: The weighing frame (72) is provided with a mounting bracket (77) at its upper end. The mounting bracket (77) is provided with a second pressure detection device (78) at its upper end. Both second pressure detection devices (78) pass through the rectangular groove (53). The upper ends of the two second pressure detection devices (78) are provided with a distribution plate (79), and the distribution plate (79) abuts against the lower end of the plastic tray (4). The upper middle part of the base (70) is provided with a first pressure detection device (76), and the first pressure detection device (76) is located inside the central groove (54) and contacts the support foot at the bottom of the plastic tray (4). Two detection rods (73) are symmetrically arranged on one side of the weighing frame (72), and the upper ends of the two detection rods (73) are provided with connecting parts (74).

7. The pressure resistance testing device based on a plastic pallet according to claim 6, characterized in that: The fulcrum detection assembly (81) includes a round rod (811) and a fulcrum plate (816). The round rod (811) is fixedly installed on the upper end of the connector (74). A connector seat (817) is provided on the upper end of the round rod (811). A ball shaft (818) is provided in the middle of the bottom wall of the fulcrum plate (816). The fulcrum plate (816) is movably installed inside the connector seat (817) through the ball shaft (818). Several pressure sensors (819) arranged in a ring array are provided at the bottom of the fulcrum plate (816).

8. The pressure resistance testing device based on a plastic pallet according to claim 7, characterized in that: The outer surface of the fulcrum plate (816) is provided with four detection ropes (814) arranged in a ring array, and a second tension sensor (815) is provided in the middle of the detection ropes (814). The outer surface of the connecting seat (817) is provided with four shaft blocks (812) arranged in a ring array, and a side rod (813) is rotatably installed inside the shaft block (812).

9. The pressure resistance testing device based on a plastic pallet according to claim 1, characterized in that: The local deformation detection component (82) includes a mounting frame (822) rotatably mounted on one end of a side rod (813). Both ends of the mounting frame (822) are provided with support plates (821), and one end of the support plate (821) is connected to the detection rope (814). The upper end of the mounting frame (822) is provided with a mounting groove (823), and a strip (824) is provided inside the mounting groove (823). A wire hole (826) is provided on one side of the mounting frame (822), and a third tension sensor (825) is provided at the bottom of the mounting frame (822). One end of the strip (824) passes through the wire hole (826) and is connected to the third tension sensor (825).

10. A method for testing the compressive strength of a plastic pallet, comprising the compressive strength testing device based on a plastic pallet as described in any one of claims 1-9, characterized in that, The specific methods for testing compressive strength are as follows: Install the load-bearing mechanism (5) on the upper end of the leg support (9), place the plastic tray (4) on the upper end of the load-bearing mechanism (5), and ensure that the support legs on both sides of the bottom of the plastic tray (4) are accurately aligned and placed on the upper end of the deformation testing mechanism (6) to monitor the deformation state of the support legs. Adjusting the position of the pressure distribution mechanism (7) synchronously drives the fulcrum detection component (81) to move to the corresponding support fulcrum position at the bottom of the plastic pallet (4), so that the pressure distribution mechanism (7) establishes contact with the key node at the bottom of the plastic pallet (4), and the fulcrum detection component (81) is distributed at each support point at the bottom of the plastic pallet (4); A load is applied to the upper end of the plastic pallet (4), and the temperature inside the detection shell (2) is controlled by the temperature control box (1) to simulate a high-temperature storage environment. The pressure distribution mechanism (7) detects the pressure distribution state of the plastic pallet (4) at key nodes under simulated stacking conditions. The fulcrum detection component (81) works with the pressure distribution mechanism (7) to detect the pressure value borne by each support point in real time. At the same time, four local deformation detection components (82) surrounding the fulcrum detection component (81) synchronously detect the degree of deformation of the plastic pallet (4) in the area around the fulcrum due to local stress concentration.

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