A tool for testing the large displacement stiffness and durability of tensile products

Abstract

The present invention relates to a tool for testing the large-displacement stiffness and durability of tensile products, comprising an upper clamping plate assembly and a lower clamping plate assembly. The upper clamping plate assembly is composed of a connecting shaft, two upper L-shaped plates, and a plurality of upper clamping plates. The upper clamping plates are composed of a mounting plate and a baffle. The mounting plate is provided with an upper clamping hole for clamping the product, and the upper clamping holes on different upper clamping plates have different shapes or sizes. The connecting shaft is provided with a mounting groove for the mounting plate to pass through, and the two upper L-shaped plates are provided with connecting shaft mounting holes. The lower clamping plate assembly is composed of two lower L-shaped plates and a plurality of lower clamping plates. The lower clamping plates are structures with mounting bosses on both sides. Each lower clamping plate is provided with a lower clamping hole for clamping the product, and the lower clamping holes on different lower clamping plates have different shapes or sizes. The lower L-shaped plates are provided with lower clamping plate mounting holes. The tool has good versatility. When clamping, the upper and lower clamping plates are used to clamp and fix the corresponding positions of the product, which is not easy to cause damage to the product, and has high testing accuracy.

Description

Technical Field

[0001] The present invention relates to a tool, in particular to a tool for testing the large displacement stiffness and durability of tensile products. Background Art

[0002] Tensile products need to be tested for large displacement stiffness and durability. Figure 1 The buckle shown is a tensile product, primarily used to connect fenders and reduce road vibrations transmitted to them. It is suitable for medium- and heavy-duty trucks. Existing tooling for testing the large-displacement stiffness and durability of tensile products has the following deficiencies:

[0003] 1. Poor matching. Existing general tensile products usually use 1 to 3 points to test the stiffness, which may cause deformation and tilt during testing. The test results often cannot reflect the actual situation of the product.

[0004] 2. The testing process can easily damage the product. When testing the stiffness, breaking strength, and durability of long rubber products like buckles, the product is typically secured by inserting a mandrel through a drilled hole or by using a screw clamp. During testing, the product becomes thinner after stretching, causing the hole diameter to widen or the screw to damage the rubber surface, resulting in skewed test results or the inability to retest and verify.

[0005] 3. Not fitting the actual vehicle installation conditions. Existing stretch products are mainly designed for convenience and versatility, but each vehicle model has specific requirements for assembly methods, boundaries, dimensions, etc., so the test results are not sufficient to reflect the conditions of a specific vehicle model.

[0006] 4. The tooling is generally too high to be suitable for large-displacement testing. Existing tensile testing of products for stiffness and durability typically uses a U-shaped chuck. This is typically taller for versatility. However, when testing large-displacement stiffness and durability, conventional dynamic testing machines on the market cannot meet the requirements due to travel limitations. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a tool for testing the large displacement stiffness and durability of tensile products. The tool has good versatility. When clamping, the upper and lower clamps are used to clamp and fix the corresponding positions of the product, which is not easy to cause damage to the product and has high testing accuracy.

[0008] The technical solution to solve the above technical problems is: a tool for testing the large displacement stiffness and durability of tensile products, comprising an upper splint assembly and a lower splint assembly, the upper splint assembly is composed of a connecting shaft, two upper L-plates and multiple upper splints, the upper splint is composed of a mounting plate and a baffle connected to the top of the mounting plate, the mounting plate is provided with an upper clamping hole for clamping the product, and the upper clamping holes on different upper splints have different shapes or sizes, the connecting shaft is provided with a mounting groove for the mounting plate to pass through, and the two upper L-shaped plates are provided with connecting shaft mounting holes; the lower splint assembly is composed of two lower L-plates and multiple lower splints, the lower splint is a structure with mounting bosses on both sides, each lower splint is provided with a lower clamping hole for clamping the product, and the lower clamping holes on different lower splints have different shapes or sizes, and the lower L-plate is provided with a lower splint mounting hole for installing the lower splint mounting boss.

[0009] The upper L-plate and the lower L-plate are provided with connection slots for connecting with the testing equipment.

[0010] When in use, the mounting plate and the mounting groove of the connecting shaft are clearance fit, and the gap between the two is 0.02-0.03mm.

[0011] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0012] 1. The upper clamping plate and upper L-plate of the present invention utilize a hole / shaft connection, resulting in high precision. The product's position can be adjusted during testing by rotating the connecting shaft, ensuring that the product does not tilt during testing and preventing product deformation. The lower clamping plate and lower L-plate utilize a square hole / boss connection, ensuring that the extended tail portion does not contact the test bench, improving test accuracy and ensuring high test precision.

[0013] 2. The present invention processes corresponding upper and lower splints according to the material, shape and size of the actual assembly location of the product. When clamping, the upper and lower splints are used to clamp and fix the corresponding positions of the product. The clamping is easy and quick, fits the actual situation of the product and is not prone to damage the product. Generally, there is no need to drill holes in the product or use screws to clamp it. This solves the problem that the existing test tooling needs to drill holes in the product or use screws to clamp it, which causes the product to become thinner after being stretched, resulting in an enlarged hole diameter or the screw damaging the rubber surface, causing the test results to deviate or be unable to be retested and verified.

[0014] 3. A set of tooling can be equipped with multiple upper and lower splints. The upper and lower splints can be customized according to the actual conditions of different products. They can match tensile products of different sizes and specifications, and are highly versatile. By replacing different upper and lower splints, a variety of products can be tested.

[0015] 4. The upper and lower L-plates adopt universal specifications to reduce the changes in the test process; the height of the tooling is adjusted to ensure that large displacements can be achieved during the test process; after the tooling is assembled, the overall arrangement is centered to avoid eccentricity and torsion during the test process, thereby improving the test accuracy.

[0016] The technical features of a tool for testing the large-displacement stiffness and durability of tensile products of the present invention will be further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 : Three-dimensional picture of buckle products.

[0018] Figure 2 : Reference diagram of the usage status of the tooling for testing the large displacement stiffness and durability of tensile products of the present invention.

[0019] Figure 3 : A three-dimensional diagram of the upper splint assembly of the present invention.

[0020] Figure 4 : The above splint three-dimensional diagram of the present invention.

[0021] Figure 5 : A three-dimensional diagram of the connecting shaft of the present invention.

[0022] Figure 6 : A top view of the upper splint assembly of the present invention.

[0023] Figure 7 : The front view of the upper splint assembly of the present invention.

[0024] Figure 8 : Figure 7 AA cross-sectional view.

[0025] Figure 9 : A three-dimensional diagram of the splint assembly according to the present invention.

[0026] Figure 10 : A three-dimensional diagram of a splint according to the present invention.

[0027] Figure 11 : Front view of the splint assembly according to the present invention.

[0028] Figure 12 : Top view of the splint assembly under the present invention.

[0029] In the figure: 1-upper splint assembly, 11-upper L plate, 12-connecting shaft, 121-mounting slot, 13-upper splint, 131-baffle, 132-mounting plate, 133-upper clamping hole, 2-lower splint assembly, 21-lower L plate, 22-lower splint, 221-mounting boss, 222-lower clamping hole, 3-connecting slot.

[0030] P-pull buckle product, P1-upper boss, P2-lower boss. DETAILED DESCRIPTION

[0031] Example: A tool for testing the large displacement stiffness and durability of tensile products, such as Figure 3-Figure 12 As shown, it includes an upper clamping plate assembly 1 and a lower clamping plate assembly 2. The upper clamping plate assembly 1 is composed of a connecting shaft 12, two upper L-shaped plates 11 and multiple upper clamping plates 13. The upper clamping plate 13 is composed of a mounting plate 132 and a baffle 131 connected to the top of the mounting plate. The mounting plate 132 is provided with an upper clamping hole 133 for clamping the product. The upper clamping holes on different upper clamping plates have different shapes or sizes and are used to clamp different products. The connecting shaft 12 is provided with a mounting groove 121 for the mounting plate to pass through, and the two upper L-shaped plates are provided with connecting shaft mounting holes. In the working state, the mounting plate 132 of the upper clamping plate 13 passes through the mounting groove 121 on the connecting shaft 12, and then the connecting shaft 12 is inserted into the connecting shaft mounting holes of the two L-shaped plates 11, thereby mounting the upper clamping plate 13 on the two upper L-shaped plates 11.

[0032] The lower clamping plate assembly 2 is composed of two lower L-shaped plates 21 and multiple lower clamping plates 22. The lower clamping plates 22 are structured with mounting bosses 221 on both sides. Each lower clamping plate 22 is provided with a lower clamping hole 222 for clamping the product. The lower clamping holes on different lower clamping plates have different shapes and sizes. The lower L-shaped plates 21 are provided with lower clamping plate mounting holes for mounting the lower clamping plate mounting bosses 221. In operation, the lower clamping plates 22 are mounted on the two lower L-shaped plates 21 by respectively clamping the mounting bosses 221 of the lower clamping plates 22 into the lower clamping plate mounting holes on the lower L-shaped plates 21.

[0033] The upper clamping hole of the upper clamping plate used for testing fastener products is rectangular, the lower clamping hole of the lower clamping plate is convex, and the lower clamping plate is convex. The shapes of the upper clamping holes and lower clamping holes of other upper clamping plates are determined according to actual conditions and are not shown in the figure.

[0034] In this embodiment, the upper L plate and the lower L plate are provided with connection slots 3 for connecting with the test equipment. When in use, the mounting plate 132 and the mounting slot 121 of the connecting shaft are clearance-fitted, with a clearance of 0.02-0.03 mm.

[0035] The working process of the present invention (taking the testing of buckle products as an example):

[0036] 1. Insert the upper clamping plate 13 into the connecting shaft 12, and then insert the upper boss P1 of the fastener product P into the upper clamping hole 133 of the upper clamping plate. Pull the upper boss of the fastener product out of the upper clamping hole until it is connected to the end.

[0037] 2. Insert the lower boss P2 of the fastener product P into the lower clamping hole 222 of the lower clamping plate.

[0038] 3. Place the upper L-plate and lower L-plate on the upper and lower splints respectively, as shown in the following figure: Figure 2 shown.

[0039] 4. Place the upper L-plate and lower L-plate on the upper and lower mounting platforms of the device, respectively, and connect them to the upper and lower mounting platforms using M10 screws.

[0040] 5. Adjust the centering of the tooling and tighten the screw.

[0041] 6. Start testing the product’s stiffness and durability according to the conditions.

[0042] 7. Stop the equipment, loosen the M10 screw, and remove the tooling and product.

[0043] 8. Follow steps 3 → 1 in reverse order to remove the product. The test is now complete.

Claims

1. A tool for testing the large displacement stiffness and durability of tensile products, characterized by: The invention comprises an upper clamping plate assembly (1) and a lower clamping plate assembly (2), wherein the upper clamping plate assembly is composed of a connecting shaft (12), two upper L-shaped plates (11) and a plurality of upper clamping plates (13), wherein the upper clamping plate is composed of a mounting plate (132) and a baffle (131) connected to the top of the mounting plate, and an upper clamping hole (133) for clamping the product is provided on the mounting plate, and the upper clamping holes on different upper clamping plates have different shapes or sizes, and the connecting shaft (121) is provided on the connecting shaft (12) for the mounting plate to pass through, and the two upper L-shaped plates are provided with connecting shaft mounting holes; the lower clamping plate assembly (2) is composed of two lower The L-plate (21) and a plurality of lower clamping plates (22) are composed of a structure with mounting bosses (221) on both sides of the lower clamping plates. Each lower clamping plate is provided with a lower clamping hole (222) for clamping the product. The lower clamping holes on different lower clamping plates have different shapes or sizes. The lower L-plate is provided with a lower clamping plate mounting hole for mounting the lower clamping plate mounting boss. When in use, the mounting grooves of the mounting plate and the connecting shaft are clearance-fitted, and the clearance between the two is 0.02-0.03 mm. The upper clamping hole of the upper clamping plate used for testing the buckle product is rectangular in shape, and the lower clamping hole of the lower clamping plate is convex in shape. The stretchable product is a buckle product (P) suitable for connecting fenders of medium and heavy trucks, and the buckle product includes an upper boss (P1) and a lower boss (P2).

2. The tool for testing the large displacement stiffness and durability of tensile products according to claim 1, characterized in that: The upper L-plate and the lower L-plate are provided with connection slots (3) for connection with the test equipment.

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