A plastic tray compression resistance detection device

Abstract

The application relates to a plastic tray compression resistance detection device, which comprises a base, outer walls on the symmetrical two sides of the base, a portal frame arranged on the outer walls, a bracket arranged in the base, a bearing disc arranged on the top of the base and the bracket and used for bearing the plastic tray, a lifting frame slidingly arranged in the portal frame and arranged above the bearing disc, a multi-point compression assembly arranged on the lifting frame and used for vertically compressing the plastic tray on the bearing disc to detect the deformation resistance of the plastic tray under vertical compression. When the piston rod of the telescopic cylinder is extended, the U-shaped push plate and the wedge-shaped extrusion frame are driven to move horizontally in the lifting frame. The wedge-shaped extrusion frame is driven to move downward by the cooperation between the wedge-shaped surface and the extrusion roller, and the downward block protrudes from the bottom plane of the lifting frame. When the lifting assembly drives the lifting frame to move downward, the downward block protruding from the bottom plane of the lifting frame is compressed to the plastic tray, so that the vertical compression resistance of the plastic tray is tested.

Description

Technical Field

[0001] This invention relates to the field of plastic pallet compression resistance testing technology, and specifically to a device for testing the compression resistance of plastic pallets. Background Technology

[0002] With the rapid development of logistics, warehousing, and intelligent manufacturing industries, plastic pallets, as a crucial basic equipment for unitized carriers, are undergoing continuous evolution in their material systems towards lightweighting, high strength, recyclability, and functionalization. Various new polymer materials, composite materials, and modified polyolefin materials are increasingly being applied in pallet manufacturing. While these new materials improve the mechanical properties and service life of pallets, they also place higher demands on their performance evaluation, including compression resistance, bending resistance, and creep resistance.

[0003] Plastic pallets made of different materials exhibit significantly different mechanical response mechanisms and failure modes. Therefore, conducting systematic compressive strength testing on plastic pallets with different materials and structural designs is crucial to ensuring their sufficient load-bearing capacity and structural stability under actual working conditions. Precise and controllable testing allows for effective screening and optimization of material formulations, verification of product reliability under different stress modes, and ultimately enables plastic pallets to meet the performance requirements of diverse applications such as high-bay warehousing, cold chain logistics, and heavy-duty stacking.

[0004] Therefore, there is an urgent need to design a plastic pallet compression test device that can perform compression test on plastic pallets, so as to achieve efficient testing of the compression resistance of plastic pallets. Summary of the Invention

[0005] The technical implementation of the present invention is as follows: a plastic pallet compression resistance testing device includes a base, a gantry frame is jointly arranged on the outer walls of the two symmetrical sides of the base, a bracket is arranged inside the base, and a support plate for supporting the plastic pallet is jointly arranged on the top of the base and the bracket. A lifting frame is slidably arranged inside the gantry frame, and the lifting frame is located above the support plate. The lifting frame is equipped with a multi-point pressure application component for applying multi-point vertical pressure to the plastic pallet on the support plate to test the plastic pallet's resistance to deformation under vertical downward pressure. A lifting component is provided on the bracket, which can lift the plastic pallet upward and form multi-point support at the bottom of the plastic pallet. When the lifting component lifts the plastic pallet upward, the multi-point pressure application component applies downward pressure to the plastic pallet to test its bending resistance.

[0006] As a further preferred embodiment, the multi-point pressure assembly includes a telescopic cylinder, a U-shaped push plate, a wedge-shaped extrusion frame, a lower pressure block, extrusion rollers, an inverted T-shaped rod, and a return spring. Telescopic cylinders are spaced apart on both sides of the lifting frame in the width direction. The moving ends of the piston rods of the telescopic cylinders located on the same side of the lifting frame are connected to the U-shaped push plate. The U-shaped push plate slides horizontally within the inner cavity of the lifting frame. Wedge-shaped extrusion frames are spaced apart inside the U-shaped push plate. Multiple sets of inverted T-shaped rods are spaced apart on both sides of the bottom length direction of the lifting frame. A lower pressure block is slidably connected between two opposing sets of inverted T-shaped rods. The lower end of the inverted T-shaped rod is located within the inner cavity of the lower pressure block. A return spring is provided between the top of the inner cavity of the lower pressure block and the lower end of the inverted T-shaped rod. The return spring is sleeved on the inverted T-shaped rod. U-shaped grooves are evenly spaced on the top of the lower pressure block. Extrusion rollers are rotatably arranged within the misaligned U-shaped grooves. The wedge-shaped extrusion frame can engage with the extrusion rollers to drive the lower pressure block to move down along the inverted T-shaped rod to perform a pressure test on the plastic pallet on the support plate.

[0007] As a further preferred option, adjacent pressing blocks are vertically sliding together.

[0008] As a further preferred option, the wedge-shaped extrusion frames inside the two U-shaped push plates are staggered.

[0009] As a further preferred embodiment, the spacing between the two U-shaped arms of the U-shaped groove is adapted to the width of the wedge-shaped extrusion frame, and the depth of the U-shaped groove is adapted to the height of the wedge-shaped extrusion frame.

[0010] As a further preferred embodiment, the wedge-shaped extrusion holder has its wedge-shaped surface facing downwards and rolling in cooperation with the extrusion rollers.

[0011] As a further preferred embodiment, the pressing blocks are divided into two groups, which are symmetrically arranged on both sides of the center line of the bearing plate. The extrusion rollers on the two groups of pressing blocks are staggered, and the extrusion rollers on the same group of pressing blocks are arranged side by side.

[0012] As a further preferred embodiment, the gantry is equipped with a lifting assembly for driving the lifting frame to move vertically up and down along the gantry. The lifting assembly includes a motor, a lead screw, and a connecting crossbar. The longitudinal frame of the gantry is rotatably equipped with a lead screw, and a motor is installed on the top of the gantry. The output shaft of the motor is connected to the upper end of the lead screw. A connecting crossbar is threaded between the two lead screws and is located above the lifting frame. A pressure sensor is fixedly installed between the top of the lifting frame and the bottom of the connecting crossbar.

[0013] As a further preferred embodiment, the lifting assembly includes a lifting cylinder, a mounting frame, and H-shaped support blocks. The lifting cylinders are spaced apart inside the bracket, and the movable end of the piston rod of the lifting cylinder is connected to the mounting frame. H-shaped support blocks are spaced apart on the mounting frame.

[0014] As a further preferred option, multiple sets of positioning holes are spaced apart on both sides of the top of the bearing plate, with two positioning holes in each set, and a limit block can be detachably installed in each set of positioning holes.

[0015] The present invention has the following advantages: 1. When the piston rod of the telescopic cylinder extends, it drives the U-shaped push plate and the wedge-shaped extrusion frame to move horizontally within the lifting frame. The wedge-shaped extrusion frame drives the lower pressure block to move downward and protrude from the bottom plane of the lifting frame through the cooperation of its wedge-shaped surface and the extrusion roller. When the lifting assembly drives the lifting frame to move downward, the lower pressure block protruding from the bottom plane of the lifting frame moves downward to apply pressure to the plastic pallet, thereby testing the vertical compressive strength of the plastic pallet. By controlling the extension amount of the telescopic cylinder piston rod, different numbers of lower pressure blocks are controlled to participate in the pressure application, thereby realizing multi-point, variable area vertical pressure test on the plastic pallet.

[0016] 2. The mounting frame and H-shaped support block are moved upward by the lifting cylinder, thereby forming multi-point support for the plastic pallet. Combined with the downward pressing action of the pressure block, the bending deformation capacity of the plastic pallet between the support points can be detected. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a three-dimensional structural diagram of the components of the present invention, including the connecting crossbeam, lifting frame, telescopic cylinder, and lower pressure block.

[0019] Figure 3 For the present invention Figure 2 A three-dimensional sectional view.

[0020] Figure 4 This is a perspective sectional view of the connecting crossbeam and the lifting frame of the present invention.

[0021] Figure 5 This is a three-dimensional structural diagram of the telescopic cylinder, U-shaped push plate, and wedge-shaped extrusion frame of the present invention.

[0022] Figure 6 This is a three-dimensional structural diagram of the pressing block, U-shaped groove, extrusion roller, inverted T-shaped rod, and return spring of the present invention.

[0023] Figure 7 This is a three-dimensional structural diagram of the components of the present invention, including the base, bearing plate, gantry frame, motor, lead screw, and bracket.

[0024] Figure 8 For the present invention Figure 7 Partial three-dimensional sectional view.

[0025] The components are: 1-base, 2-bearing plate, 3-bracket, 4-gantry frame, 5-motor, 51-lead screw, 6-connecting crossbar, 7-lifting frame, 8-pressure sensor, 9-telescopic cylinder, 10-U-shaped push plate, 11-wedge-shaped extrusion frame, 12-lowering block, 120-U-shaped groove, 121-extrusion roller, 13-inverted T-shaped rod, 14-reset spring, 15-lifting cylinder, 16-mounting frame, 17-H-shaped support block, 18-limiting block, 19-positioning hole. Detailed Implementation

[0026] The present invention will be further described below with reference to specific embodiments. It should also be noted that, unless otherwise explicitly specified and limited, terms such as "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0027] Example: A device for testing the compressive strength of a plastic pallet, such as... Figure 1 , Figure 7 and Figure 8 As shown, the device includes a base 1, a support plate 2, a bracket 3, a gantry frame 4, a lifting frame 7, a multi-point pressure application assembly, and a lifting assembly. The gantry frame 4 is symmetrically mounted on the outer walls of both sides of the base 1. The bracket 3 is installed inside the base 1. The support plate 2 for supporting the plastic pallet is mounted on the top of the base 1 and the bracket 3. The lifting frame 7 is slidably mounted inside the gantry frame 4 and is located above the support plate 2. The lifting frame 7 is equipped with a multi-point pressure application assembly for applying multi-point vertical pressure to the plastic pallet on the support plate 2 to test the plastic pallet's resistance to deformation under vertical downward pressure. The bracket 3 is equipped with a lifting assembly that can lift the plastic pallet upward and form multi-point support at the bottom of the plastic pallet. When the lifting assembly lifts the plastic pallet upward, the multi-point pressure application assembly applies downward pressure to the plastic pallet to test its bending resistance.

[0028] like Figure 7 and Figure 8 As shown, multiple sets of positioning holes 19 are spaced apart on both sides of the top of the bearing plate 2. Each set of positioning holes 19 contains two holes. Each set of positioning holes 19 has a detachable limit block 18, which abuts against the top plane of the bearing plate 2. Furthermore, the positioning holes 19 are internally threaded holes, and the limit block 18 is fixed to the bearing plate 2 by a fixing screw, which is threaded into the positioning hole 19.

[0029] like Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the multi-point pressure assembly includes a telescopic cylinder 9, a U-shaped push plate 10, a wedge-shaped extrusion frame 11, a lower pressure block 12, an extrusion roller 121, an inverted T-shaped rod 13, and a return spring 14. Telescopic cylinders 9 are spaced apart on both sides of the lifting frame 7. The telescopic cylinders 9 on the left and right sides are staggered. The moving ends of the piston rods of the telescopic cylinders 9 on the same side of the lifting frame 7 are connected to the U-shaped push plate 10. The top of the lifting frame 7 has a staggered sliding groove. The U-shaped push plate 10 slides horizontally in the inner cavity of the lifting frame 7. The wedge-shaped extrusion frames 11 are spaced apart in the U-shaped push plate 10. The U-shaped push plate 10 slides in cooperation with the sliding groove on the lifting frame 7. When the telescopic cylinder 9 drives the U-shaped push plates 10 on both sides to move towards each other, the wedge-shaped extrusion frames 11 on both sides move synchronously with the U-shaped push plate 10. The wedge-shaped extrusion frames 11 in the U-shaped push plates 10 on the left and right sides are staggered, thereby ensuring that the wedge-shaped extrusion frames 11 on both sides do not interfere with each other when they move towards each other. Multiple sets of inverted T-shaped rods 13 are spaced apart on both the front and rear sides of the bottom of the lifting frame 7. Each set of T-shaped rods 13 consists of two rods. A lower pressure block 12 is slidably connected between the two opposing sets of inverted T-shaped rods 13. Adjacent lower pressure blocks 12 are vertically slidably fitted. The lower end of the inverted T-shaped rod 13 is located within the inner cavity of the lower pressure block 12. A return spring 14 is installed between the top of the inner cavity of the lower pressure block 12 and the lower end of the inverted T-shaped rod 13. The return spring 14 is sleeved on the inverted T-shaped rod 13. U-shaped grooves 120 are evenly spaced on the top of the lower pressure block 12. A pressing roller 121 is rotatably mounted within the staggered U-shaped grooves 120. Specifically, as shown... Figure 3 As shown: the pressure block 12 is divided into two groups, and the two groups of pressure blocks 12 are symmetrically arranged on the left and right sides of the center line of the bearing plate 2. The extrusion rollers 121 on the two groups of pressure blocks 12 are staggered, and the extrusion rollers 121 on the same group of pressure blocks 12 are arranged side by side. The wedge-shaped extrusion frame 11 has its wedge-shaped surface facing downwards and rolls in cooperation with the extrusion roller 121. When the piston rod of the telescopic cylinder 9 extends outwards, it drives the U-shaped push plate 10 connected to it to move horizontally along the inner cavity of the lifting frame 7. The U-shaped push plate 10 pushes the wedge-shaped extrusion frame 11 connected to it to move horizontally, and the wedge-shaped surface of the wedge-shaped extrusion frame 11 extrudes the extrusion roller 121, thereby pushing the lower pressure block 12 to overcome the elastic force of the return spring 14 and move downwards along the inverted T-shaped rod 13, thereby pressing the plastic pallet vertically downwards. By controlling the distance the piston rod of the telescopic cylinder 9 extends outwards, the corresponding number of lower pressure blocks 12 are controlled to move downwards, thereby providing different areas of downward pressure force to the plastic pallet as needed, and then observing the deformation of the plastic pallet under different areas of vertical downward pressure force.

[0030] like Figure 3As shown, the distance between the two U-shaped arms of the U-shaped groove 120 is adapted to the width of the wedge extrusion frame 11, and the depth of the U-shaped groove 120 is adapted to the height of the wedge extrusion frame 11, so that the wedge extrusion frame 11 can slide through the U-shaped groove 120 and be extruded and engaged with the extrusion roller 121 provided in the U-shaped groove 120. The extrusion roller 121 is in rolling engagement with the wedge-shaped surface of the wedge extrusion frame 11.

[0031] like Figure 1 and Figure 7 As shown, the gantry frame 4 is equipped with a lifting assembly for driving the lifting frame 7 to move vertically up and down along the gantry frame 4. The lifting assembly includes a motor 5, a lead screw 51, and a connecting crossbar 6. The lead screw 51 is rotatably mounted on the longitudinal frame portion of the gantry frame 4. The motor 5 is mounted on the top of the gantry frame 4, and the output shaft of the motor 5 is connected to the upper end of the lead screw 51. The connecting crossbar 6 is threaded between the two lead screws 51 and is located above the lifting frame 7. A pressure sensor 8 is fixedly installed between the top of the lifting frame 7 and the bottom of the connecting crossbar 6. When the motor 5 drives the lead screw 51 to rotate, the connecting crossbar 6 moves vertically up and down along the gantry frame 4, and the pressure sensor 8 drives the lifting frame 7 to move vertically up and down. The pressure sensor 8 is used to monitor the reaction force of the plastic pallet on the anti-downward pressure block 12 and the lifting frame 7, thereby determining the vertical compressive strength of the plastic pallet.

[0032] In use, the plastic pallet to be tested is placed at the top center of the bearing plate 2. According to the pallet size, the limiting block 18 is installed in the corresponding positioning hole 19 to limit the pallet. At this time, the piston rods of the telescopic cylinders 9 on both sides extend outward synchronously, thereby pushing the U-shaped push plates 10 on both sides to move towards each other in the inner cavity of the lifting frame 7. The two U-shaped push plates 10 push the wedge-shaped extrusion frame 11 connected to them to move horizontally synchronously, thereby causing the wedge-shaped surfaces of the wedge-shaped extrusion frame 11 on both sides to gradually contact and extrude the extrusion roller 121 on the top of the pressure block 12. Under the pushing action of the wedge-shaped surface, the extrusion roller 121 drives the lower pressure block 12 to overcome the elastic force of the return spring 14 and move vertically downward along the inverted T-shaped rod 13, protruding downward from the bottom plane of the lifting frame 7. Subsequently, the motor 5 drives the lead screw 51 to rotate, causing the connecting crossbar 6 to descend vertically along the gantry 4. The pressure sensor 8 drives the lifting frame 7 to descend continuously, causing the lower pressure block 12 protruding from the bottom plane of the lifting frame 7 to apply downward pressure to the plastic pallet. After the plastic pallet is subjected to force, its reaction force acts on the lower pressure block 12 and provides an upward force to the lower pressure block 12 and the lifting frame 7. The pressure value is monitored in real time by the pressure sensor 8, and the deformation of the plastic pallet under different pressure areas is observed.

[0033] By controlling the extension distance of the piston rod of the telescopic cylinder 9, different numbers of pressing blocks 12 can be selected to participate in the pressing action according to the test requirements, thereby applying different areas of downward pressure to the plastic tray from both sides.

[0034] like Figure 7 and Figure 8 As shown, the lifting assembly includes a lifting cylinder 15, a mounting frame 16, and H-shaped support blocks 17. The lifting cylinder 15 is spaced apart inside the bracket 3. The movable end of the piston rod of the lifting cylinder 15 is connected to the mounting frame 16. The mounting frame 16 is spaced apart with H-shaped support blocks 17. The lifting cylinder 15 drives the mounting frame 16 and the H-shaped support blocks 17 to perform vertical lifting and lowering movements. When the H-shaped support blocks 17 move upward and protrude from the top plane of the bearing plate 2, the multiple H-shaped support blocks 17 provide multi-point support for the plastic pallet. When the pressing block 12 moves downward to press down on the plastic pallet, its resistance to bending deformation is confirmed by observing the bending deformation of the plastic pallet.

[0035] When a bending deformation test is required, the mounting frame 16 and the H-shaped support block 17 are driven to rise vertically by the lifting cylinder 15, so that the H-shaped support block 17 protrudes from the top plane of the bearing plate 2 and lifts the plastic pallet upward. At this time, multiple H-shaped support blocks 17 serve as multiple discrete support points for the plastic pallet. When the pressing block 12 is pressed down, the bending resistance of the plastic pallet is evaluated by observing the degree of bending deformation between adjacent H-shaped support blocks 17.

[0036] After the test, the piston rod of the telescopic cylinder 9 retracts, and the return spring 14 pushes the lower pressure block 12 to rise and reset; the lifting cylinder 15 drives the H-shaped support block 17 to descend back below the bearing plate 2; the motor 5 reverses to raise the lifting frame 7 to the initial position, removes the plastic tray and records the data.

[0037] Although this disclosure has been described with respect to only a limited number of embodiments, those skilled in the art who benefit from this disclosure will understand that various other embodiments can be devised without departing from the scope of the invention. Therefore, the scope of the invention should be limited only by the appended claims.

Claims

1. A device for testing the compressive strength of a plastic pallet, comprising a base (1), a gantry frame (4) symmetrically arranged on the outer walls of both sides of the base (1), a bracket (3) arranged inside the base (1), a support plate (2) for supporting the plastic pallet arranged on the top of the base (1) and the bracket (3), and a lifting frame (7) slidably arranged inside the gantry frame (4), the lifting frame (7) being located above the support plate (2), characterized in that, The lifting frame (7) is equipped with a multi-point pressure component, which is used to apply multi-point vertical pressure to the plastic pallet on the support plate (2) to test the plastic pallet's resistance to deformation when subjected to vertical downward pressure; the bracket (3) is equipped with a lifting component, which can lift the plastic pallet upward and form multi-point support at the bottom of the plastic pallet. When the lifting component lifts the plastic pallet upward, the multi-point pressure component applies downward pressure to the plastic pallet to test its bending resistance.

2. The plastic pallet compression resistance testing device according to claim 1, characterized in that, The multi-point pressure assembly includes a telescopic cylinder (9), a U-shaped push plate (10), a wedge-shaped extrusion frame (11), a lower pressure block (12), an extrusion roller (121), an inverted T-shaped rod (13), and a return spring (14). Telescopic cylinders (9) are spaced apart on both sides of the lifting frame (7) in the width direction. The moving ends of the piston rods of the telescopic cylinders (9) located on the same side of the lifting frame (7) are connected to the U-shaped push plate (10). The U-shaped push plate (10) slides horizontally in the inner cavity of the lifting frame (7). Wedge-shaped extrusion frames (11) are spaced apart inside the U-shaped push plate (10). Multiple sets of inverted T-shaped rods (13) are spaced apart on both sides of the bottom length direction of the lifting frame (7). Two sets of inverted T-shaped rods are positioned opposite each other. A pressing block (12) is slidably connected between the T-shaped rods (13). The lower end of the inverted T-shaped rod (13) is located in the inner cavity of the pressing block (12). A return spring (14) is provided between the top of the inner cavity of the pressing block (12) and the lower end of the inverted T-shaped rod (13). The return spring (14) is sleeved on the inverted T-shaped rod (13). U-shaped grooves (120) are evenly spaced on the top of the pressing block (12). A pressing roller (121) is rotatably arranged in the misaligned U-shaped groove (120). The wedge-shaped pressing frame (11) can press and cooperate with the pressing roller (121) to drive the pressing block (12) to move down along the inverted T-shaped rod (13) to press down on the plastic tray on the bearing plate (2).

3. A plastic pallet compression resistance testing device according to claim 2, characterized in that, The adjacent pressing blocks (12) are in a vertical sliding fit.

4. A plastic pallet compression resistance testing device according to claim 2, characterized in that, The wedge-shaped extrusion frame (11) inside the two U-shaped push plates (10) is staggered.

5. A plastic pallet compression resistance testing device according to claim 2, characterized in that, The spacing between the two U-shaped arms of the U-shaped groove (120) is adapted to the width of the wedge extrusion frame (11), and the depth of the U-shaped groove (120) is adapted to the height of the wedge extrusion frame (11).

6. A plastic pallet compression resistance testing device according to claim 2, characterized in that, The wedge-shaped extrusion frame (11) has its wedge-shaped surface facing downward and rolls in cooperation with the extrusion roller (121).

7. A plastic pallet compression resistance testing device according to claim 2, characterized in that, The pressing blocks (12) are divided into two groups. The two groups of pressing blocks (12) are symmetrically arranged on both sides of the center line of the bearing plate (2). The extrusion rollers (121) on the two groups of pressing blocks (12) are staggered, and the extrusion rollers (121) on the same group of pressing blocks (12) are arranged side by side.

8. A plastic pallet compression resistance testing device according to claim 1, characterized in that, A lifting assembly for driving the lifting frame (7) to rise and fall vertically along the gantry frame (4) is provided on the gantry frame (4). The lifting assembly includes a motor (5), a lead screw (51) and a connecting crossbar (6). The longitudinal frame part of the gantry frame (4) is rotatably provided with the lead screw (51). The top of the gantry frame (4) is equipped with a motor (5). The output shaft of the motor (5) is connected to the upper end of the lead screw (51). The two lead screws (51) are threadedly connected to the connecting crossbar (6). The connecting crossbar (6) is located above the lifting frame (7). A pressure sensor (8) is fixedly installed between the top of the lifting frame (7) and the bottom of the connecting crossbar (6).

9. A plastic pallet compression resistance testing device according to claim 1, characterized in that, The lifting assembly includes a lifting cylinder (15), a mounting frame (16), and an H-shaped support block (17). The lifting cylinder (15) is spaced apart inside the bracket (3). The movable end of the piston rod of the lifting cylinder (15) is connected to the mounting frame (16). The H-shaped support block (17) is spaced apart on the mounting frame (16).

10. A plastic pallet compression resistance testing device according to claim 1, characterized in that, Multiple sets of positioning holes (19) are provided at intervals on both sides of the top of the bearing plate (2). The number of positioning holes (19) in each set is set to two. Limiting blocks (18) are detachably provided in each set of positioning holes (19).

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