A thermal insulation tool in a low temperature tank for impact testing

Abstract

The present invention discloses a heat preservation tooling in a low temperature tank for impact test, which comprises a plurality of stacked tray grids, each layer of which is provided with a plurality of grooves for placing samples; wherein the bottom surface of the groove is inclined from the first side surface of the groove to the second side surface, the first side surface and the second side surface are arranged oppositely, and the bottom of the second side surface is lower than the bottom of the first side surface; there is a first gap between the placed sample and the first side surface; the second side surface is provided with a recessed portion, so that there is a second gap between the placed sample and the second side surface; in the use state, when the sample is placed in the groove, the sample can slide to the second side surface of the groove; when the sample is transferred, the transfer device can extend into the first gap and the second gap to clamp the sample. The heat preservation tooling of the present invention can be positioned quickly and accurately, and will not cause the samples to touch each other.

Description

Technical Field

[0001] The invention relates to the technical field of metal detection equipment, and in particular to a heat-insulating tooling in a low-temperature tank for an impact test. Background Art

[0002] The Charpy impact test is a test used to determine the notch sensitivity (toughness) of metal materials. A metal sample of a certain shape and size is prepared so that it has a U-shaped notch or a V-shaped notch. It is placed in a simply supported beam state on a Charpy impact tester. The pendulum lifted by the tester is used to impact the sample once, so that the sample breaks along the notch. The absorbed energy of the sample is calculated by the height difference when the pendulum rises again when it breaks. A large absorbed energy value (joule) indicates that the material has good toughness and is insensitive to notches or other stress concentrations in the structure.

[0003] Charpy impact test can be carried out at different temperatures. The most common method is to use liquid medium for cooling. The relevant national standard GB / T 229 requires: When using liquid medium to cool the sample, the sample should be placed on a grid in a container. The grid should be at least 25mm higher than the bottom of the container. The height of the liquid immersed in the sample should be at least 25mm. The sample should be at least 10mm away from the side wall of the container. The sample should maintain a sufficient distance from the inner surface of the low-temperature device and between samples.

[0004] The currently used grids can separate the samples when they are placed, but during the heat preservation process, the liquid medium in the low-temperature tank needs to be stirred to make the temperature uniform, which often causes the impact samples to move on the grid and touch each other, which cannot meet the requirements of the standard. The conventional practice is to leave a certain amount of space in a low-temperature tank to reduce the number of samples placed, but this will reduce the test efficiency and cannot guarantee that the samples will not touch each other. Summary of the invention

[0005] The purpose of the present invention is to provide a convenient, efficient and reasonable insulation tool for sample insulation, the insulation process meets the requirements of the standard, can be quickly and accurately positioned during the clamping process, and will not cause the samples to touch each other.

[0006] In order to achieve the above-mentioned purpose, the present invention provides an insulation tooling in a low-temperature tank for an impact test, the insulation tooling comprising a plurality of stacked tray grids, each layer of the tray grids being provided with a plurality of grooves for placing a sample; wherein the bottom surface of the groove is inclined from the first side surface of the groove to the second side surface, the first side surface and the second side surface are arranged opposite to each other, and the bottom of the second side surface is lower than the bottom of the first side surface; a first gap is provided between the placed sample and the first side surface; a recess is provided on the second side surface so that a second gap is provided between the placed sample and the second side surface; in a use state, when the sample is placed in the groove, the sample can slide to the second side surface of the groove; when the sample is transferred, the transfer device can extend into the first gap and the second gap to clamp the sample.

[0007] Preferably, the bottom surface of the groove forms an angle of 8 to 15 degrees with the horizontal plane.

[0008] Preferably, the depth of the groove is 5 to 8 mm.

[0009] Preferably, the horizontal cross-section of the groove is in the shape of a "convex" character.

[0010] Preferably, the distance between the groove and the edge of the tray grid is greater than 25 mm.

[0011] Preferably, the thermal insulation tooling further comprises: a bracket disposed at the bottom of the pallet grid for supporting the pallet grid.

[0012] Preferably, the height of the bracket is not less than 30 mm.

[0013] Preferably, the thermal insulation tooling further comprises: a container containing a liquid medium, wherein the tray grid is placed in the container.

[0014] Preferably, the distance between the groove and the bottom of the container is greater than 25 mm.

[0015] Preferably, in the stacked pallet grids, the distance between adjacent pallet grids is 25-40 mm.

[0016] Beneficial effects:

[0017] (1) The present invention can avoid the situation in which the samples move on the tray grid and touch each other due to the vibration and stirring of the low-temperature tank during the sample insulation process, thereby failing to meet the requirements of the standard.

[0018] (2) When using a special low-temperature clamp to clamp, the tilted bottom of the groove and the presence of the concave portion allow for more accurate and rapid positioning, avoiding turbidity and poor vision caused by the low temperature of alcohol or other cooling liquids, which can lead to inaccurate clamping and repeated adjustments.

[0019] (3) The shape of the groove is convex, which prevents the sample from sticking to the tray grid or fitting each other, resulting in the phenomenon of being unable to clamp. It can facilitate accurate and rapid positioning and clamping of the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a top view of the heat preservation tooling in the impact test low-temperature tank of the present invention.

[0021] Figure 2 It is a front view of the heat preservation tooling in the impact test low temperature tank of the present invention.

[0022] Figure 3 It is a left view of the heat preservation tooling in the impact test low temperature tank of the present invention.

[0023] Figure 4 This is a top view of the groove in the thermal insulation tooling of Example 1. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] like Figures 1 to 3 As shown, the heat preservation tooling in the impact test low temperature tank of the present invention comprises a plurality of stacked tray grids 1, and each layer of the tray grids 1 is provided with a plurality of grooves 2 for placing the sample. The bottom surface of the groove 2 is inclined from the first side surface of the groove 2 to the second side surface, the first side surface and the second side surface are arranged oppositely, and the bottom of the second side surface is lower than the bottom of the first side surface; there is a first gap between the placed sample and the first side surface; the second side surface is provided with a recessed portion 21, so that there is a second gap between the placed sample and the second side surface. In the use state, when the sample is placed in the groove 2, the sample can slide to the second side surface of the groove 2; when the sample is transferred, the transfer device can extend into the first gap and the second gap to clamp the sample.

[0026] The heat-insulating tooling of the present invention is suitable for the Charpy pendulum impact test, and the specific test method refers to the national standard. Currently, the national standard GB / T 229 is referred to. The length of the standard size impact specimen is 55 mm, the cross section is a 10 mm x 10 mm square cross section, and there is a V-shaped or U-shaped notch in the middle of the specimen length. The transfer device can use the clamp in GB / T 229-2007 to take the specimen out of the medium and place it on the testing machine.

[0027] The tray grid 1 and the groove 2 are arranged as a mesh basket with holes. The depth of the groove is 5 to 8 mm.

[0028] The bottom surface of the groove 2 forms an angle of 8 to 15° with the horizontal plane. Since the bottom surface of the groove 2 is inclined, after the sample is placed, the sample will slide in the inclined direction under the action of gravity. Figure 1 and Figure 2 In the process, the sample will slide from the left to the right in the groove 2. The groove 2 with an inclined bottom surface is conducive to the rapid positioning of the sample when transferring the sample, because the sample will be attached to the second side surface of the groove 2 (the side with the recessed portion 21), and its position is relatively fixed. When placing the sample, the non-notched surface of the sample is against the second side surface of the groove 2, and the notched surface faces outward, so as to facilitate the precise clamping of the special impact fixture.

[0029] In some embodiments, the horizontal cross-section of the groove 2 is in the shape of a "convex" character. The groove 2 can prevent the sample from sticking to the tray grid 1 or fitting each other, resulting in the phenomenon of being unable to clamp, and can facilitate accurate and rapid positioning and clamping of the sample. The specific shape of the "convex" character groove 2 can be found in Figure 1 The "convex"-shaped groove 2 is a rectangular groove with a recessed portion 21. The sample is rectangular, so the main cross-section of the groove 2 is rectangular. Since the transfer device needs to be moved out of the groove 2 during the transfer process, and the sample is attached to the second side of the groove 2, the transfer device cannot be inserted. Therefore, a recessed portion 21 is set on the second side of the groove 2 for the transfer device to be inserted.

[0030] When using a special low-temperature clamp to clamp, due to the inclination of the bottom of the groove 2 and the presence of the recessed portion 21, positioning can be more accurate and rapid, avoiding turbidity and poor vision caused by the low temperature of alcohol or other cooling liquids, which may cause inaccurate clamping and repeated adjustments.

[0031] To comply with the standard, the distance between the groove 2 and the edge of the pallet grid 1 is greater than 25 mm.

[0032] The bottom of the pallet grid 1 is provided with four brackets 11 for supporting the pallet grid 1, so as to ensure that the pallet grid 1 can be placed stably. The height of the brackets 11 is not less than 30 mm. If multiple layers of pallet grids 1 are provided, brackets 11 are also provided under each layer of pallet grids 1, and the distance between adjacent pallet grids 1 is 25 to 40 mm.

[0033] The heat preservation tooling also comprises: a container (not shown) containing a liquid medium, in which the tray grid 1 is placed. The distance between the groove 2 and the bottom of the container is greater than 25 mm.

[0034] Example 1

[0035] A heat preservation tool in a low temperature tank for impact testing is provided with a tray grid, and the tray grid is provided with a plurality of grooves for placing the specimens. The depth of the grooves is 5 to 8 mm. The top view of the grooves is as follows Figure 4 As shown, it is in the shape of a "convex" character. The main body of the groove is rectangular, with a length of 70 to 80 mm and a width of 20 to 30 mm. The second side of the groove ( Figure 4 A recessed portion is provided at the top of the groove, the recessed portion is recessed by 5 to 10 mm, and the width of the recessed portion is 20 to 30 mm. The bottom of the groove is inclined downward toward the second side surface.

[0036] In summary, the insulation tooling in the impact test low-temperature tank of the present invention is convenient, efficient and reasonable to use, the insulation process meets the requirements of the standard, and can be positioned more quickly and accurately during the clamping process, and will not cause the samples to touch each other.

[0037] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A heat preservation tool in a low temperature tank for impact test, characterized in that: The thermal insulation tooling comprises a plurality of stacked tray grids, each layer of which is provided with a plurality of grooves for placing the specimens; wherein: The bottom surface of the groove is inclined from the first side surface of the groove to the second side surface, the first side surface and the second side surface are arranged opposite to each other, and the bottom of the second side surface is lower than the bottom of the first side surface; there is a first gap between the inserted sample and the first side surface; the second side surface is provided with a recessed portion, so that there is a second gap between the inserted sample and the second side surface; In the use state, when the sample is placed in the groove, the sample can slide to the second side of the groove; when the sample is transferred, the transfer device can extend into the first gap and the second gap to clamp the sample; The bottom surface of the groove forms an angle of 8 to 15° with the horizontal plane; The horizontal cross-section of the groove is in the shape of a "convex" character.

2. The heat preservation tooling in the impact test low temperature tank according to claim 1 is characterized in that: The depth of the groove is 5 to 8 mm.

3. The heat preservation tooling in the impact test low temperature tank according to claim 1, characterized in that: The distance between the groove and the edge of the tray grid is greater than 25 mm.

4. The heat preservation tooling in the impact test low temperature tank according to claim 1, characterized in that: The thermal insulation tooling also includes: a bracket disposed at the bottom of the pallet grid and used for supporting the pallet grid.

5. The heat preservation tooling in the impact test low temperature tank according to claim 4, characterized in that: The height of the bracket is not less than 30 mm.

6. The heat preservation tooling in the impact test low temperature tank according to claim 1, characterized in that: The heat-insulating tooling also comprises: a container containing a liquid medium, and the tray grid is placed in the container.

7. The heat preservation tooling in the impact test low temperature tank according to claim 6, characterized in that: The distance between the groove and the bottom of the container is greater than 25 mm.

8. The heat preservation tooling in the impact test low temperature tank according to claim 1, characterized in that: In the stacked pallet grids, the distance between adjacent pallet grids is 25 to 40 mm.

Images