A polyurethane foam compression strength test sample preparation tool

Abstract

The utility model discloses a kind of preparation tool of polyurethane foam compression strength test sample, including vacuum pump, the positioning disc connected with vacuum pump, the sucking disc matched on positioning disc, first suction hole is opened in the positioning disc, the suction pipe of vacuum pump is connected with first suction hole, a plurality of second suction holes are opened in the sucking disc, the arrangement position of second suction hole on sucking disc is one-to-one corresponding with test sample after sample blank cutting, second suction hole is used to fix test sample.The utility model is fixed by the way of vacuum suction, not only realizes effective fixing for sample blank, but also can be fixed continuously to each cutting completed test sample, solve the problem that sample blank is displaced and test sample is cut by cutting blade in the process of CNC cutting, ensure the cutting quality consistency of test sample, improve the cutting precision of test sample, the accuracy of subsequent compression strength test result is effectively guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of liquefied natural gas and relates to polyurethane foam compressive strength testing technology, specifically to a tooling for preparing polyurethane foam compressive strength test samples. Background Technology

[0002] LNG (liquefied natural gas) carriers are vessels specifically designed for the storage and transportation of liquefied natural gas. They store liquefied natural gas in storage tanks, the inner chamber of which is composed of various modules (such as insulation modules and shielding modules). Both the insulation and shielding modules are composite board structures, with a polyurethane foam board in the middle layer. Due to the special properties of liquefied natural gas, the storage tanks need to have excellent sealing, insulation, and structural strength. The compressive strength of the polyurethane foam board is a very important indicator, so it is necessary to conduct compressive strength tests on the polyurethane foam material to ensure that the compressive performance of the polyurethane foam board meets the requirements.

[0003] To meet the connection and testing requirements of the compressive strength tester, test samples need to be prepared first. Then, the compressive strength tester is used to test the samples and obtain compressive strength data. The test samples are small square foam blocks. Currently, a single polyurethane foam block is cut into small square blocks using a CNC machine tool. However, in the actual cutting process, on the one hand, the sample blocks are difficult to fix effectively, leading to positional shifts. On the other hand, the smaller foam blocks cut first are often carried away by the cutting blade, affecting subsequent cuts and potentially causing damage. In short, achieving ideal cutting quality consistency and precision for small square test samples is difficult, resulting in significant errors in the shape and size of the final test samples. This affects the accuracy of subsequent compressive strength test results, making it difficult to achieve the desired testing effect. Summary of the Invention

[0004] Purpose of the invention: To overcome the shortcomings of existing technologies, this invention provides a tooling for preparing polyurethane foam compressive strength test samples. By using vacuum suction, without affecting CNC cutting, it not only effectively fixes the sample blank but also continuously fixes each cut test sample. This solves the problems of sample blank displacement and test samples being carried away by the cutting blade during CNC cutting, ensuring the consistency of the cutting quality of the test samples, improving the cutting accuracy of the test samples, and effectively guaranteeing the accuracy of subsequent compressive strength test results.

[0005] Technical Solution: To achieve the above objectives, this utility model provides a tooling for preparing polyurethane foam compressive strength test samples, including a vacuum pump, a positioning plate connected to the vacuum pump, and a suction cup fitted on the positioning plate. The positioning plate has a first suction hole, and the suction pipe of the vacuum pump is connected to the first suction hole. The suction cup has a plurality of second suction holes, and the arrangement of the second suction holes on the suction cup corresponds one-to-one with the test sample after the sample block is cut. The second suction holes are used to fix the test sample.

[0006] Furthermore, the first air intake is located at the center of the positioning disk.

[0007] Furthermore, the outer edge of the positioning disk protrudes upward to form a limiting fence to prevent the suction cup from sliding out of the positioning disk.

[0008] Furthermore, there is a gap between the bottom of the second suction hole and the positioning plate to ensure the connection between the second suction hole and the first suction hole, thereby fixing the sample blank and each test sample.

[0009] Furthermore, the suction cup is provided with a positioning rail to facilitate the positioning of the sample blank on the suction cup.

[0010] Beneficial effects: Compared with the prior art, this utility model, through vacuum suction, not only effectively fixes the sample blank without affecting CNC cutting, but also continuously fixes each cut test sample. It solves the problems of sample blank displacement and test sample being carried away by the cutting blade during CNC cutting, ensuring the consistency of the cutting quality of the test samples, improving the cutting accuracy of the test samples, and effectively guaranteeing the accuracy of the subsequent compressive strength test results. Attached Figure Description

[0011] Figure 1 A schematic diagram of the overall structure of the tooling;

[0012] Figure 2 This is a schematic diagram of the positioning disc on the tooling.

[0013] Figure 3 This is a schematic diagram of the suction cup structure;

[0014] Figure 4 This is a diagram showing the placement of the sample blank on the suction cup;

[0015] Figure 5 This is a schematic diagram of CNC cutting of a sample blank. Detailed Implementation

[0016] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0017] like Figures 1-3 As shown, this embodiment provides a tooling for preparing polyurethane foam compressive strength test samples, including two vacuum pumps 1, six positioning disks 3, and six suction cups 4. A first suction hole 6 is provided at the center of each positioning disk 3. Each vacuum pump 1 is connected to the bottom of three first suction holes 6 simultaneously through three suction pipes 2. The six suction cups 4 are respectively fitted onto the six positioning disks 3. The outer edge of the positioning disk 3 protrudes upward to form a limiting fence 7 to prevent the suction cups 4 from slipping off the positioning disk 3. Thirty-five second suction holes 8 are provided on each suction cup 4, arranged in a 5*7 array. The arrangement of each second suction hole 8 on the suction cup 4 corresponds one-to-one with the test sample 5 cut from the sample blank 10. Positioning rails 9 are provided on the suction cup 4 to facilitate the positioning of the sample blank 10 on the suction cup 4. There is a gap between the bottom of the second suction hole 8 and the positioning disk 3 to ensure communication between the second suction hole 8 and the first suction hole 6, thereby fixing the sample blank 10 and each test sample 5.

[0018] In this embodiment, a whole square sample blank 10 is prepared into a small square test sample 5 of a specified size using the above-mentioned preparation tooling. The specific operation process is as follows:

[0019] Reference Figure 4 Six sample blanks 10 are placed on six suction cups 4 respectively. With the assistance of the positioning rails 9, the position of the sample blanks 10 is adjusted so that the sample blanks 10 cover the 35 second suction holes 8.

[0020] Reference Figure 2 and Figure 5 The vacuum pump 1 is started, and vacuum is drawn through the first suction port 6 and the second suction port 8. Due to the adsorption force, the sample blank 10 is effectively adsorbed and fixed on the suction cup 4. Then, the CNC machine tool is started, and the sample blank 10 is cut by the CNC cutting blade 11 according to the set program and parameters, and finally 35 small square test samples 5 are formed.

[0021] It should be noted that during the above cutting process, since each second suction hole 8 is continuously suctioning, the test sample 5 that has been cut first will continue to be adsorbed and fixed on the suction cup 4 due to the adsorption force in the second suction hole 8 below it, and there will be no positional displacement. Therefore, the problems of sample blank 10 shifting and test sample 5 being carried away by the cutting blade during CNC cutting are solved, ensuring the consistency of the cutting quality of test sample 5, improving the cutting accuracy of test sample 5, and effectively ensuring the accuracy of subsequent compressive strength test results.

Claims

1. A tooling for preparing polyurethane foam compressive strength test samples, characterized in that, It includes a vacuum pump, a positioning plate connected to the vacuum pump, and a suction cup fitted on the positioning plate. The positioning plate has a first suction hole, and the suction pipe of the vacuum pump is connected to the first suction hole. The suction cup has a plurality of second suction holes. The arrangement of the second suction holes on the suction cup corresponds one-to-one with the test sample after the sample blank is cut. The second suction holes are used to fix the test sample.

2. The preparation fixture for a polyurethane foam compressive strength test sample according to claim 1, characterized in that, The first air intake hole is located at the center of the positioning plate.

3. The preparation fixture for a polyurethane foam compressive strength test sample according to claim 1, characterized in that, The outer edge of the positioning disc protrudes upward to form a limiting fence.

4. The preparation fixture for a polyurethane foam compressive strength test sample according to claim 1, characterized in that, There is a gap between the bottom of the second air intake and the positioning plate.

5. The preparation fixture for a polyurethane foam compressive strength test sample according to claim 1, characterized in that, The suction cup is equipped with a positioning bar.

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