Tool for testing impact shear strength of LNG (Liquefied Natural Gas) polyurethane foam sample

Abstract

The utility model discloses a tool for testing the impact shear strength of an LNG (Liquefied Natural Gas) polyurethane foam sample, which comprises a base block, a pressing block and an impact column, the base block is provided with a positioning groove matched with the pressing block, and the positioning groove and the pressing block are respectively and longitudinally provided with a first impact hole and a second impact hole which are butted and matched with each other; the first impact hole and the second impact hole are matched with an impact column, and the impact column is connected to a testing machine. According to the utility model, the punching positioning precision of the sample can be ensured, the accuracy of the impact shear strength test is ensured, the test effect is ensured, the sample cannot be damaged in the whole test process, the operation is simple and efficient, and the test efficiency is also obviously improved.

Description

Technical Field

[0001] The utility model belongs to the field of liquefied natural gas, relates to an impact shear strength testing technology for LNG polyurethane foam samples, and particularly relates to a tool used for the impact shear strength testing of LNG polyurethane foam samples. Background Art

[0002] Liquefied natural gas (LNG) storage tanks are special warehouses used to store and transport liquefied natural gas, which are usually installed on LNG carriers. Due to the characteristics of liquefied natural gas, the storage tanks used to store liquefied natural gas on LNG carriers must have extremely high standards of sealing, flame retardancy, insulation, etc. LNG polyurethane foam modules are components that make up the inner wall of the storage tank. Impact shear strength is an important performance indicator of the LNG polyurethane foam module. Otherwise, it will not meet the use requirements of the LNG storage tank, so the LNG polyurethane foam module needs to be tested for impact shear strength.

[0003] The existing testing method is to cut a sample of a specified shape from a module, then fix the sample with a fixture, and then use the impact column of the testing machine to punch a hole in the sample to obtain impact shear strength data. However, this method has some disadvantages, as follows:

[0004] 1. Since the sample is polyurethane foam, its structure is not very stable, and the fixture has limited fixing effect on the sample, and it cannot achieve all-round fixation. As a result, the sample is prone to displacement, which will affect the punching positioning accuracy and effect, resulting in low accuracy of the impact shear strength data.

[0005] 2. When the fixture is clamping the sample, the sample is easily damaged due to the impact force of the impact column.

[0006] 3. The clamping and releasing operations of the sample are complicated, and the entire operation process is time-consuming, resulting in low test efficiency. Summary of the Invention

[0007] Purpose of the invention: In order to overcome the shortcomings of the existing technology, a tooling is provided for the impact shear strength test of LNG polyurethane foam samples, which can ensure the punching positioning accuracy of the sample, ensure the accuracy of the impact shear strength test, and guarantee the test effect. The entire test process will not damage the sample. The operation is simple and efficient, and the test efficiency is also significantly improved.

[0008] Technical solution: To achieve the above-mentioned purpose, the utility model provides a tool for impact shear strength testing of LNG polyurethane foam samples, comprising a base block, a pressing block and an impact column. The base block is provided with a positioning groove matching the pressing block, and the positioning groove and the pressing block are respectively longitudinally provided with a first impact hole and a second impact hole that dock and match each other, the first impact hole and the second impact hole match the impact column, and the impact column is connected to the testing machine.

[0009] Furthermore, the positioning groove is a square groove structure, and the pressing block is a square structure.

[0010] Furthermore, the first impact hole and the second impact hole are coaxially arranged on the positioning groove and the pressing block respectively.

[0011] Furthermore, the tooling also includes a base and a buffer pad, the buffer pad is arranged on the base, and the base block is arranged on the buffer pad. The buffer pad can be an elastic pad such as a rubber pad. The buffer pad can protect the impact column and the base to prevent the impact column from directly impacting the base and causing damage to both.

[0012] Furthermore, the height of the pressing block is greater than the depth of the positioning groove, ensuring that the pressing block will not be completely embedded in the positioning groove, making it easy to remove the pressing block.

[0013] Furthermore, the length of the impact column is greater than the sum of the heights of the base block and the pressing block, ensuring that the impact column can penetrate the base block and the pressing block.

[0014] Beneficial effects: Compared with the existing technology, the utility model adopts a specially designed tooling instead of a fixture to assist LNG polyurethane foam samples in completing the impact shear strength test, which has the following advantages:

[0015] 1. The cooperation between the base block and the pressing block can effectively fix the sample without position deviation, ensuring the punching accuracy of the impact column for the sample, improving the accuracy of the impact shear strength test, and improving the test effect.

[0016] 2. During the entire test process, under the clamping action of the base block and the pressing block, the sample will not be damaged when the impact column performs the impact punching operation, thus ensuring the integrity of the sample.

[0017] 3. The operation of the entire test is simple and efficient, and the test efficiency has also been significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the exploded structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the combined structure of the present utility model. DETAILED DESCRIPTION

[0020] The present invention is further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention made by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0021] like Figure 1 and Figure 2 As shown, the utility model provides a tool for impact shear strength testing of LNG polyurethane foam samples, including a base 1, a buffer pad 2, a base block 3, a pressing block 4, and an impact column 5. The buffer pad 2 is arranged on the base 1, and the base block 3 is arranged on the buffer pad 2. The buffer pad 2 is a rubber pad. A positioning groove 7 matching the pressing block 4 is opened on the base block 3. The positioning groove 7 is a square groove structure, and the pressing block 4 is a square structure. The height of the pressing block 4 is greater than the depth of the positioning groove 7. The positioning groove 7 and the pressing block 4 are respectively longitudinally provided with a first impact hole 8 and a second impact hole 9 that dock and match each other. The first impact hole 8 and the second impact hole 9 are respectively coaxially arranged on the positioning groove 7 and the pressing block 4. The first impact hole 8 and the second impact hole 9 match the impact column 5. The length of the impact column 5 is greater than the sum of the heights of the base block 3 and the pressing block 4. The impact column 5 is connected to the impact head 6 of the testing machine.

[0022] In this embodiment, the above-mentioned tooling is applied to the impact shear strength test of the LNG polyurethane foam sample 10. The specific operation process is as follows:

[0023] First, the LNG polyurethane foam sample 10 is cut into a square structure that matches the positioning groove 7. In this embodiment, the LNG polyurethane foam sample 10 is a three-dimensional rectangle of 50mm*50mm*11.50mm. Then, the LNG polyurethane foam sample 10 is placed in the positioning groove 7. Then, the pressing block 4 is pressed on the LNG polyurethane foam sample 10 in the positioning groove 7, so that the LNG polyurethane foam sample 10 is fixed between the positioning groove 7 and the pressing block 4. Then, the testing machine is started, and the impact column 5 is impacted downward by the impact head 6. The impact column 5 passes through the second impact hole 9 to punch a hole in the LNG polyurethane foam sample 10, and then passes through the first impact hole 8 to contact the buffer pad 2. The testing machine obtains the impact shear strength data of the LNG polyurethane foam sample 10 according to the output of the impact column 5. Finally, the impact column 5 is moved up and disengaged, the pressing block 4 is taken out, and the LNG polyurethane foam sample 10 is taken out from the positioning groove 7.

[0024] The above testing process has the following advantages:

[0025] 1. The LNG polyurethane foam sample 10 can be effectively fixed without positional displacement, thereby ensuring the punching accuracy of the impact column 5 for the LNG polyurethane foam sample 10, improving the accuracy of the impact shear strength test, and improving the test effect.

[0026] 2. During the entire test process, under the clamping action of the base block 3 and the pressing block 4, the LNG polyurethane foam sample 10 will not be damaged when the impact column 5 performs the impact punching operation, thereby ensuring the integrity of the sample.

[0027] 3. The entire test operation is very simple and efficient, the test time is reduced, and the test efficiency is significantly improved.

Claims

1. A tool for testing the impact shear strength of LNG polyurethane foam samples, characterized in that: It includes a base block, a pressing block and an impact column. The base block is provided with a positioning groove that matches the pressing block. The positioning groove and the pressing block are respectively longitudinally provided with a first impact hole and a second impact hole that dock and match each other. The first impact hole and the second impact hole match the impact column, and the impact column is connected to the testing machine.

2. The tool for testing the impact shear strength of LNG polyurethane foam samples according to claim 1, characterized in that: The positioning groove is a square groove structure, and the pressing block is a square structure.

3. The tool for testing the impact shear strength of LNG polyurethane foam samples according to claim 1, characterized in that: The first impact hole and the second impact hole are coaxially arranged on the positioning groove and the pressing block respectively.

4. The tool for testing the impact shear strength of LNG polyurethane foam samples according to claim 1, characterized in that: The tooling also includes a base and a buffer pad, wherein the buffer pad is arranged on the base, and the base block is arranged on the buffer pad.

5. The tool for testing the impact shear strength of LNG polyurethane foam samples according to claim 1, characterized in that: The height of the pressing block is greater than the depth of the positioning groove.

6. The tool for testing the impact shear strength of LNG polyurethane foam samples according to claim 1, characterized in that: The length of the impact column is greater than the sum of the heights of the base block and the pressing block.

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