A plastic pallet load strength testing device

Abstract

The utility model relates to the technical field of tray bearing strength test, and disclose a kind of plastic tray bearing strength testing device, including the vibration table of tray for testing, the top of vibration table is fixedly connected with bottom plate, the top of bottom plate is equipped for the tray to be detected, the top of tray is placed for the counterweight weight of weight increase, the both ends of bottom plate are fixedly connected with vertical frame, the one side of vertical frame is equipped for the push plate for limiting the transverse position of counterweight weight, the other side of vertical frame is equipped with electric push rod, and the push plate of two is equipped with the pressing plate for limiting the vertical position of counterweight weight between the push plate.The utility model is driven by push plate, pressing plate and adjustable baffle of cylinder drive of electric push rod, realize the rigid constraint of test load in horizontal and vertical direction, effectively simulate the real transport in cargo bundling state.

Description

Technical Field

[0001] This utility model relates to the field of pallet load-bearing strength testing technology, and more specifically to a plastic pallet load-bearing strength testing device. Background Technology

[0002] In the load-bearing strength testing of plastic pallets, the vibration table is a key dynamic performance evaluation method. Specifically, it can replicate the continuous vibration generated by trucks, trains or ships in motion. This test aims to simulate the complex mechanical challenges faced by pallets in real logistics transportation environments. However, it is this simulation of the real environment that introduces the complexity of the test. The test state is far from an idealized single pallet, but a dynamic system containing multiple interacting objects.

[0003] Secondly, the test must include standardized simulated loads, which are usually homogeneous weights or sandbags. During the shaking process, they do not remain still. They will generate continuous micro-impacts and friction with the pallet, which may cause the load to shift, sink, or even overturn.

[0004] However, the strapping or wrapping film introduced to fix the load will dynamically change the stress state during the test. The way the strapping is fixed may loosen due to vibration and lose its restraint, or it may cause local cutting damage at the sharp edges of the tray due to excessive tension. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a plastic pallet load-bearing strength testing device to solve the problems existing in the background art.

[0006] This utility model provides the following technical solution: a plastic pallet load-bearing strength testing device, including a vibration table for testing the pallet, a base plate fixedly connected to the top of the vibration table, a pallet to be tested on the top of the base plate, a counterweight for adding weight on the top of the pallet, vertical frames fixedly connected to both ends of the base plate, a push plate for limiting the lateral position of the counterweight on one side of the vertical frame, an electric push rod for pushing the push plate towards the counterweight on the other side of the vertical frame, a pressure plate for limiting the vertical position of the counterweight between the two push plates, and a limiting component for further limiting the lateral position of the counterweight between the two push plates.

[0007] As a further embodiment of this utility model, each of the two push plates is provided with two round rods on one side for guiding the push plates, and one end of the round rods passes through the vertical frame.

[0008] As a further embodiment of this utility model, the top of the base plate is provided with at least four limiting blocks, and the four limiting blocks form a limiting space for the tray.

[0009] As a further embodiment of this utility model, a slide rail is provided on one side of the two push plates to cooperate with the pressure plate, and a connecting plate is fixedly connected to the inner side of the two vertical frames. A cylinder for pushing the pressure plate is provided on the top of the connecting plate, and the actuating end of the cylinder is fixed to the pressure plate.

[0010] As a further embodiment of this utility model, the limiting component includes a plurality of threaded holes that are opened on one side of the push plate and are evenly distributed, and both ends of the two push plates are provided with a stop that cooperates with the threaded holes.

[0011] As a further embodiment of this utility model, both extended ends of the retainer are provided with holes that mate with threaded holes.

[0012] As a further embodiment of this invention, the stop is located at the center of the counterweight and is in contact with one side of the counterweight.

[0013] As a further embodiment of this invention, the width of the counterweight is equal to the width of the tray, and their centers are on the same horizontal line.

[0014] The technical effects and advantages of this utility model are as follows:

[0015] 1. This utility model achieves rigid constraint on the test load in the horizontal and vertical directions by using a push plate driven by an electric push rod, a pressure plate driven by a cylinder, and an adjustable baffle. It effectively simulates the bundled state of goods in real transportation, completely eliminates the relative displacement between the load and the pallet, and ensures the accuracy and reliability of vibration test data.

[0016] 2. This utility model, through its modular adjustable baffle and threaded hole array combination structure, can quickly adapt to counterweights of different weights, significantly improving the versatility and testing efficiency of the equipment.

[0017] 3. This utility model, by providing a precision guiding mechanism composed of a round rod and a vertical frame, ensures that the push plate makes a strictly linear movement during the clamping process, avoiding deflection and jamming. This not only extends the service life of the electric push rod, but also ensures that the clamping force is uniform and consistent in each test. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the electric actuator assembly of this utility model.

[0020] Figure 3 This is a schematic diagram of the unfolded baffle of this utility model.

[0021] The attached diagram is labeled as follows: 1. Vibration table; 2. Base plate; 3. Vertical frame; 4. Counterweight; 5. Round rod; 6. Electric push rod; 7. Limiting block; 8. Threaded hole; 9. Slide rail; 10. Push plate; 11. Cylinder; 12. Stop; 13. Hole; 14. Pressure plate; 15. Connecting plate. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. This utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] Reference Figures 1-3 This utility model provides a plastic pallet load-bearing strength testing device, including a vibration table 1 for testing the pallet. The top of the vibration table 1 is fixed with a base plate 2 by bolts. The top of the base plate 2 is provided with a pallet to be tested. A counterweight 4 for adding weight is placed on the top of the pallet. The counterweight 4 of a predetermined weight is stacked or placed at the center of the top of the pallet. The counterweight 4 can be a combination of multiple weights of different specifications to simulate different weight distributions and load conditions. The material of the counterweight 4 is usually high-density metal to ensure that its weight is accurate and stable and will not be affected by external environmental factors. When placing the counterweight 4, it is necessary to strictly follow the predetermined weight and position requirements. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0024] Both ends of the base plate 2 are fixed with vertical frames 3 by bolts. One side of the vertical frame 3 is provided with a push plate 10 for limiting the lateral position of the counterweight 4. The other side of the vertical frame 3 is provided with an electric push rod 6 for pushing the push plate 10 to move in the direction of the counterweight 4. The operator places the tray to be tested smoothly on the base plate 2 on top of the vibration table 1. The top of the base plate 2 is provided with at least four limiting blocks 7, and the four limiting blocks 7 form a limiting space for the tray. The position of the tray is calibrated and limited by the at least four limiting blocks 7 pre-installed on the base plate 2. These limiting blocks 7 together form a positioning frame that matches the shape of the tray. The limiting space formed by the limiting blocks 7 effectively prevents the tray from sliding horizontally on the base plate 2, avoids potential dangers, and provides a stable foundation for accurate testing.

[0025] Two round rods 5 are provided on one side of each of the two push plates 10 for guiding the push plates 10. One end of the round rods 5 passes through the vertical frame 3. The two round rods 5 are fixed to one side of the push plate 10 and installed parallel to each other. The other ends of the two round rods 5 pass precisely through the corresponding light holes or linear bearings on the vertical frame 3. The vertical frame 3 acts as a fixed guide seat. Precise linear guidance ensures that the clamping force is always perpendicular to the plane of the push plate 10 and acts directly on the weight. This prevents the lateral bending moment on the actuator end of the electric push rod 6 from being generated due to the deflection of the push plate 10.

[0026] Specifically, the electric push rods 6 on the outer sides of the two vertical frames 3 are activated. The actuators of the electric push rods 6 extend and push the push plates 10 on both sides along the guide rod 5, moving synchronously towards each other until they are tightly attached to both sides of the counterweight 4. At this time, the two push plates 10 apply a uniform and vertical clamping force to the counterweight 4 to ensure that the counterweight 4 remains stable during the test and will not shift or shake due to vibration or other external forces.

[0027] Among them, one side of the two push plates 10 is provided with a slide 9 that cooperates with the pressure plate 14. The inner side of the two vertical frames 3 is fixed with a connecting plate 15 by bolts. The top of the connecting plate 15 is provided with a cylinder 11 for pushing the pressure plate 14, and the actuating end of the cylinder 11 is fixed to the pressure plate 14. After horizontal clamping, the cylinder 11 installed on the connecting plate 15 is activated. The actuating end of the cylinder 11 extends downward and drives the pressure plate 14 to move downward along the slide 9 on the push plate 10, and finally presses it on the top surface of the counterweight 4. This process constrains the vertical degree of freedom of the counterweight 4 and prevents the counterweight 4 from jumping up during vibration.

[0028] It should be noted that the electric push rod 6 can be used in conjunction with a magnetic switch, proximity switch or photoelectric switch to achieve precise control of the extension and retraction displacement of the push plate 10. The cylinder 11 in this application is a power actuator that converts the pressure energy of compressed air into mechanical energy. It can be connected to an external air pipe and a solenoid valve and drive the piston to perform linear reciprocating motion by controlling the gas in and out. It can be used in conjunction with a magnetic switch, proximity switch or photoelectric switch to achieve precise control of the extension and retraction displacement of the pressure plate 14. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0029] A pressure plate 14 for limiting the vertical position of the counterweight 4 is provided between the two push plates 10. A limiting component for further limiting the lateral position of the counterweight 4 is provided between the two push plates 10. The limiting component includes multiple threaded holes 8 opened on one side of the push plate 10 and evenly distributed. Both ends of the two push plates 10 are provided with a stop 12 that mates with the threaded holes 8. According to the height of the counterweight 4, a suitable threaded hole 8 is selected, and the two stop 12 are installed on the push plates 10 on both sides by bolts. The stop 12 limits the counterweight 4 from the other two sides, forming a secondary lateral constraint and forming a surrounding frame, which completely eliminates the possibility of the counterweight 4 moving in any horizontal direction.

[0030] In addition, both extended ends of the stop 12 are provided with holes 13 that mate with the threaded holes 8. The stop 12 is placed in position so that the holes 13 on the two extended ends of the stop 12 are precisely aligned with the threaded holes 8. Bolts are passed through the holes 13 and screwed into the threaded holes 8. The preload generated by tightening the bolts securely locks the stop 12 onto the push plate 10.

[0031] The baffle 12 is located at the center of the counterweight 4 and is in contact with one side of the counterweight 4. When the counterweight 4 is placed between the two push plates 10, the baffle 12, which is located at the center and in contact with one side, can apply a constraint force to it from a specific position. Together with the pressure plate 14 and the threaded hole 8, it can ensure the stability of the counterweight 4 in all aspects during the test and avoid affecting the accuracy of the plastic pallet load-bearing strength test due to the shaking or displacement of the counterweight 4.

[0032] The width of the counterweight 4 is equal to the width of the tray, and the center position is on the same horizontal line. This ensures that the force applied by the counterweight 4 is evenly distributed on the plastic tray during the test, avoiding test errors caused by uneven force distribution.

[0033] The use of this utility model involves the following steps:

[0034] S1: Place the plastic pallet to be tested on the base plate 2 at the top of the vibration table 1, ensuring that the pallet is effectively constrained by the limiting blocks 7 around the base plate 2 to complete the initial positioning. Then, according to the load required for the test, place the corresponding weight 4 smoothly on the center area of ​​the top surface of the pallet.

[0035] S2: Activate the electric push rods 6 on the outside of the two vertical frames 3. The electric push rods 6 push the push plate 10. Under the precise guidance of the round rod 5, the push plate 10 moves synchronously towards each other until it is tightly attached to both sides of the counterweight 4, thus completing the rigid constraint on the main lateral degrees of freedom of the weight.

[0036] S3: Start the cylinder 11 installed on the connecting plate 15. The actuator of the cylinder 11 extends downward and drives the pressure plate 14 to move down along the slide 9 on the push plate 10. Finally, it presses the top surface of the counterweight 4 with constant pressure, completely restricting its vertical displacement and preventing it from jumping up during vibration.

[0037] S4: Based on the longitudinal height of the counterweight 4, select the threaded hole 8 at the corresponding position on the side of the push plate 10, align the holes 13 on the two extended ends of the stop 12 with the selected threaded hole 8, and tighten them with bolts so that the stop 12 contacts and restricts the counterweight 4 from the other end, forming a complete horizontal plane enclosure constraint.

[0038] S5: After confirming that all limiting components are secure, start the vibration table 1 and conduct the test according to the preset vibration spectrum. The data acquisition system monitors and records the strain, acceleration and other response data of the pallet under dynamic load in real time until the test cycle is completed or the pallet failure is observed. Finally, the data is analyzed to evaluate its load-bearing strength and fatigue life.

[0039] It should be noted that the specific model of the vibration table 1 is HZJ-A. Based on the principle of electric motors that "a current-carrying conductor experiences force in a magnetic field", it uses electrical signals to precisely control the surface to simulate complex vibrations. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0040] Finally, the following points should be noted: In the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "linkage" should be interpreted broadly, and can be mechanical or electrical connection, or internal connection between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may change.

[0041] The electronic components and modules used in this utility model can all be parts that are commonly used in the market and can achieve the specific functions in this case. The specific models and sizes can be selected and adjusted according to actual needs.

[0042] The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

Claims

1. A plastic pallet load-bearing strength testing device, comprising a vibration table (1) for testing the pallet, characterized in that: The top of the vibration table (1) is fixedly connected to a base plate (2). The top of the base plate (2) is provided with a tray for testing. The top of the tray is provided with a counterweight (4) for weight increase. Both ends of the base plate (2) are fixedly connected to a vertical frame (3). One side of the vertical frame (3) is provided with a push plate (10) for limiting the lateral position of the counterweight (4). The other side of the vertical frame (3) is provided with an electric push rod (6) for pushing the push plate (10) to move in the direction of the counterweight (4). Between the two push plates (10) is a pressure plate (14) for limiting the vertical position of the counterweight (4). Between the two push plates (10) is a limiting component for secondary limiting the lateral position of the counterweight (4).

2. The plastic pallet load-bearing strength testing device according to claim 1, characterized in that: Two round rods (5) are provided on one side of each of the two push plates (10) for guiding the push plate (10), and one end of the round rod (5) passes through the vertical frame (3).

3. The plastic pallet load-bearing strength testing device according to claim 1, characterized in that: The top of the base plate (2) is provided with at least four limiting blocks (7), and the four limiting blocks (7) form a limiting space for the pallet.

4. The plastic pallet load-bearing strength testing device according to claim 1, characterized in that: The two push plates (10) have a slide (9) on one side that cooperates with the pressure plate (14). The two vertical frames (3) are fixedly connected to the inner side of a connecting plate (15). The top of the connecting plate (15) is provided with a cylinder (11) for pushing the pressure plate (14), and the actuating end of the cylinder (11) is fixed to the pressure plate (14).

5. The plastic pallet load-bearing strength testing device according to claim 1, characterized in that: The limiting component includes multiple threaded holes (8) that are opened on one side of the push plate (10) and are evenly distributed. Both ends of the two push plates (10) are provided with a stop (12) that cooperates with the threaded holes (8).

6. The plastic pallet load-bearing strength testing device according to claim 5, characterized in that: Both extended ends of the retainer (12) are provided with holes (13) that mate with the threaded holes (8).

7. The plastic pallet load-bearing strength testing device according to claim 6, characterized in that: The stop (12) is located at the center of the counterweight (4) and is in contact with one side of the counterweight (4).

8. The plastic pallet load-bearing strength testing device according to claim 7, characterized in that: The width of the counterweight (4) is equal to the width of the tray, and the center position is on the same horizontal line.

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