Dumbbell-shaped rubber sample tensile property marking device

Abstract

The utility model relates to a rubber sample marking device, in particular to a dumbbell-shaped rubber sample tensile property marking device which comprises a placing bottom plate and a U-shaped marking device, the placing bottom plate comprises a sample placing groove and a limiting protrusion, the sample placing groove is used for horizontally stacking dumbbell-shaped samples, the limiting protrusion is used for accurately positioning the placed samples, and the U-shaped marking device is arranged on the placing bottom plate. A set of marking line positioning grooves are further formed in the lofting groove, a U-shaped opening of the U-shaped marking device is matched with the marking line positioning grooves, and after the U-shaped marking device is inserted into the marking line positioning grooves, marking lines can be drawn on the side face of the sample. The dumbbell-shaped sample marking device is simple in structure, high in practicability, convenient and rapid in operation process, capable of accurately and rapidly marking a plurality of samples at the same time and improving the accuracy of rubber performance test results, and suitable for marking procedures of dumbbell-shaped samples in rubber performance tests.

Description

Technical Field

[0001] The utility model relates to a marking device for rubber specimens, specifically a tensile property marking device for dumbbell-shaped rubber specimens. Background Art

[0002] Indicators such as the tensile strength, elongation at break, modulus at a specified elongation, and elongation at a specified stress of rubber are important indicators reflecting the properties of rubber. Measuring these indicators is usually carried out in accordance with "GB / T 528-2009 Determination of Tensile Stress-Strain Properties of Vulcanized Rubber or Thermoplastic Rubber". The standard stipulates that before measuring the cut dumbbell-shaped specimens, two markings need to be made in the length direction of the narrow part. The distance between the markings is the test length, which is the initial distance for measuring indicators such as elongation. As Figure 1 shown is the shape of the dumbbell-shaped specimen specified in this standard. The test length shown in the figure needs to be marked by drawing two reference lines. The two marking lines should be marked on the narrow part of the specimen and be equidistant from the center of the specimen. The size of the test length depends on the type of rubber.

[0003] Currently, marking specimens usually adopts the method of manually measuring and positioning with a ruler one by one and then drawing lines. First, find the midpoint position of the specimen, and then draw two markings according to the different sizes required by the specimen type. Each group of tests requires test data of 3-5 identical specimens. However, due to the differences in measurement among different personnel and also the differences in measurement by the same person when measuring different specimens successively, there are differences in the markings of different specimens, and even the phenomenon of excessive errors resulting in inaccurate results. Moreover, this method of measuring and drawing lines one by one has low efficiency. Content of the Utility Model

[0004] To solve the above deficiencies in the prior art, the utility model aims to provide a tensile property marking device for dumbbell-shaped rubber specimens, so as to achieve the purpose of quickly positioning and accurately marking the dumbbell-shaped specimens used in the test.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows: A tensile property marking device for dumbbell-shaped rubber specimens, including a placement bottom plate and a U-shaped marking device. The placement bottom plate includes a sample placement groove for horizontally stacking dumbbell-shaped specimens, and also includes a limit protrusion for defining the placement position of one of the long curved sides of the dumbbell-shaped specimen; the side elevation of the limit protrusion is a limit surface, and the intersection line of the limit surface and the bottom surface of the sample placement groove is consistent with the long curved side of the dumbbell-shaped specimen; a group of marking positioning grooves are opened on the side of the sample placement groove away from the limit protrusion, and the U-shaped opening of the U-shaped marking device is inserted into the marking positioning groove, and the U-shaped opening matches the marking positioning groove.

[0006] As a definition of the present utility model: The marking positioning groove is composed of two parallel through grooves, the centers of the two through grooves coincide with the axis of symmetry of the limiting surface curve, and the distance between the two through grooves meets the test gauge length of the dumbbell-shaped specimen.

[0007] As a definition of the present utility model: The distance from the bottom of the marking positioning groove to the limiting surface is less than the width of the narrowest part of the dumbbell-shaped specimen.

[0008] As a definition of the present utility model: A handle is fixedly arranged on the U-shaped bottom of the U-shaped marking device.

[0009] Due to the adoption of the above technical solutions, compared with the prior art, the beneficial effects obtained by the present utility model are as follows: The placing bottom plate is divided into adjacent sample placing grooves and limiting protrusions. The sample placing grooves are semi-open, which is convenient for placing specimens; the limiting protrusions are used to limit the placing position of one of the long curved sides of the dumbbell-shaped specimen, that is, the specimen is horizontally placed in the sample placing groove and the positioning of the specimen is completed at the same time, which can ensure that the placing positions of one specimen or multiple stacked specimens are consistent and can achieve rapid positioning; the marking positioning groove is opened on the edge of the sample placing groove, and the U-shaped marking device dipped with printing ink or pigment is inserted into the marking positioning groove to complete the marking action on the side of the specimen, so that the marking position is accurate and the marking positions of multiple specimens are consistent.

[0010] To sum up, the present utility model has a simple structure and convenient operation, can accurately and quickly mark several specimens at the same time, and is applicable to the marking of dumbbell-shaped specimens in rubber performance testing. Description of the Drawings

[0011] The following further describes the present utility model in detail with reference to the drawings and specific embodiments.

[0012] Figure 1 is the shape of the dumbbell-shaped specimen specified in 《GB / T528 - 2009》;

[0013] Figure 2 is the three-dimensional structure schematic diagram of the embodiment of the present utility model;

[0014] Figure 3 is the three-dimensional structure schematic diagram of the placing bottom plate of the embodiment of the present utility model;

[0015] Figure 4 is the three-dimensional structure schematic diagram of another placing bottom plate of the embodiment of the present utility model;

[0016] Figure 5 is the three-dimensional structure schematic diagram of the U-shaped marking device of the embodiment of the present utility model;

[0017] Figure 6 is the three-dimensional structure schematic diagram of the using state of the embodiment of the present utility model;

[0018] In the figure: 1 - test length, 2 - placement base plate, 21 - lofting groove, 22 - limiting protrusion, 23 - marking line positioning groove, 24 - limiting surface, 3 - U-shaped marking device, 31 - handle, 4 - dumbbell-shaped specimen. Specific embodiments

[0019] The preferred embodiments of the present utility model will be described below in conjunction with the accompanying drawings. It should be understood that the dumbbell-shaped rubber specimen tensile property marking device described herein is a preferred embodiment, which is only used to illustrate and explain the present utility model and does not constitute a limitation to the present utility model. Embodiment

[0020] In this embodiment, as Figure 2 shown, it is a dumbbell-shaped rubber specimen tensile property marking device, including a placement base plate 2 and a U-shaped marking device 3. The placement base plate 2 is used to place the dumbbell-shaped specimen 4 to be marked, and the U-shaped marking device 3 is used to mark the dumbbell-shaped specimen 4.

[0021] Specifically, as Figures 2 - 3 shown, the placement base plate 2 includes a lofting groove 21 for horizontally stacking the dumbbell-shaped specimens 4, and also includes a limiting protrusion 22 for limiting the placement position of one of the long curved sides of the dumbbell-shaped specimen 4. The side surface of the limiting protrusion 22 is a limiting surface 24, and the limiting surface 24 is perpendicular to the bottom surface of the lofting groove 21. The intersection line of the limiting surface 24 and the bottom surface of the lofting groove 21 is consistent with the long curved side of the dumbbell-shaped specimen 4, that is, the limiting surface 24 is in the shape of a curved surface that fits the long curved side of the dumbbell-shaped specimen 4. When the dumbbell-shaped specimen 4 is horizontally and completely placed in the lofting groove 21, one of the long curved sides of the dumbbell-shaped specimen 4 is made to fit the limiting surface 24. The position of the dumbbell-shaped specimen 4 is restricted by the shape of the limiting surface 24, and accurate positioning of the dumbbell-shaped specimen 4 is completed. The specimens are stacked on top of each other. This stacking method ensures the consistency of the placement positions of each specimen in the vertical direction through the restriction of the limiting surface 24. As Figure 4 shown, it is another form of the placement base plate 2, that is, the lofting groove 21 is surrounded by the limiting protrusions 22 in three directions, forming a limiting surface 24 with three faces. At this time, the limiting surface 24 that can play a role in positioning the dumbbell-shaped specimen 4 is still the side that fits the long curved side of the dumbbell-shaped specimen 4. The dumbbell-shaped specimen is placed in the lofting groove 21 for marking.

[0022] As Figure 3 、 Figure 4As shown in the figure, a set of marking positioning grooves 23 are provided on one side of the lofting groove 21 away from the limit protrusion 22. The marking positioning grooves 23 are composed of two parallel through grooves. The through grooves should be narrow slits. The specific position and grooving depth of the through grooves are defined as follows: the centers of the two through grooves coincide with the symmetry axis of the curve of the limit surface 24, and the distance between the two through grooves satisfies the test length l of the dumbbell-shaped specimen 4. Specifically, in this embodiment, the type of the dumbbell-shaped specimen 4 is selected as Type 1 in "GB / T528-2009", the test length l is 25.5 ± 0.5 mm, and the size of each part of the specimen should meet the requirements specified in the standard. At the same time, the shape and size of the limit surface of the corresponding marking device should be consistent with the long curve side of the Type 1 dumbbell-shaped specimen. The distance from the bottom of the through groove to the limit surface 24 is less than the width of the narrowest part of the dumbbell-shaped specimen 4.

[0023] As Figure 5 shown, the U-shaped marking device 3 is provided. The U-shaped opening of the U-shaped marking device 3 can be inserted into the marking positioning groove 23. Specifically, the opening distance and thickness of its U-shaped opening match the marking positioning groove 23. And because the distance from the bottom of the through groove to the limit surface 24 is less than the width of the narrowest part of the dumbbell-shaped specimen 4, in this way, when the U-shaped opening end is inserted into the marking positioning groove 23, it can contact the side surface of the dumbbell-shaped specimen 4 placed outward, so that the ink paste or marking liquid dipped by the U-shaped opening end makes marks on the side surface of the narrow part of the specimen, that is, the marking of the test length position of the specimen is completed. For the convenience of the operator to pick up and place, a handle 31 is fixedly arranged on the U-shaped marking device 3. The handle is set as a thin plate perpendicular to the U-shaped bottom of the U-shaped marking device 3. Of course, the shape of the handle 31 can also be set as the handle shape in the conventional technology.

[0024] As Figure 6 shown, when using this embodiment, a number of dumbbell-shaped specimens are obtained according to the sampling requirements in GB / T 528-2009. Three specimens are required for a group of tests. Take 3 specimens and stack them in turn in the lofting groove 21 of the placing bottom plate 2 to ensure that one of the long curve sides of each specimen fits the limit surface 24; dip the U-shaped opening end of the U-shaped marking device 3 with ink paste or marking liquid, insert it into the marking positioning groove 23, make the U-shaped opening end contact the side surface of the specimen, and mark the ink paste or marking liquid on the side surfaces of the 3 specimens, that is, the marking of the test length is completed, and then the tensile properties or other properties of the 3 specimens can be tested. Each different type of dumbbell-shaped specimen 4 specified in "GB / T528-2009" corresponds to a matching marking device. In actual use, one or several commonly used marking devices can be selected and made according to the needs of the laboratory.

[0025] The utility model has a simple structure, can accurately and quickly mark several specimens in the same group at the same time, eliminate the errors of the marking position and distance caused by human differences, and improve the accuracy of the rubber performance test results.

Claims

1. A tensile performance marking device for dumbbell-shaped rubber specimens, characterized in that: The invention comprises a placing bottom plate and a U-shaped marking device. The placing bottom plate comprises a layout groove for horizontally stacking dumbbell-shaped specimens, and also comprises a limiting protrusion for limiting the placement position of one of the long curved sides of the dumbbell-shaped specimen. The side elevation of the limiting protrusion is a limiting surface, and the intersection line between the limiting surface and the bottom surface of the layout groove is consistent with the long curved side of the dumbbell-shaped specimen. A group of marking line positioning grooves are opened on one side of the layout groove away from the limiting protrusion, and the U-shaped opening of the U-shaped marking device is inserted into the marking line positioning groove, and the U-shaped opening matches the marking line positioning groove.

2. A dumbbell-shaped rubber specimen tensile performance marking device according to claim 1, characterized in that: The marking line positioning groove is composed of two parallel through grooves, the centers of the two through grooves coincide with the symmetry axis of the limit surface curve, and the distance between the two through grooves satisfies the test gauge length of the dumbbell-shaped specimen.

3. A dumbbell-shaped rubber specimen tensile performance marking device according to claim 1 or 2, characterized in that: The distance from the bottom of the marking line positioning groove to the limiting surface is smaller than the width of the dumbbell-shaped specimen at the narrowest part.

4. A dumbbell-shaped rubber specimen tensile performance marking device according to claim 3, characterized in that: A handle is fixedly arranged on the U-shaped bottom of the U-shaped marking device.

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