Sample for rubber crack propagation measurement, sample vulcanization mold and clamp

Abstract

The utility model relates to the field of rubber mechanics measurement samples and appliances, and discloses an improved sample for rubber crack propagation measurement, a vulcanization mold of the sample and a clamp, the middle part of the sample is rectangular rubber, two long edges of the rectangular rubber extend to be provided with cylindrical rubber, the thickness of the rectangular rubber is smaller than the diameter of the cylindrical rubber, and the thickness of the cylindrical rubber is smaller than that of the rectangular rubber. And the matched clamp is provided with a corresponding arc rib. By adopting the sample and the clamp, the phenomena of sample clamp opening cracking and sample slipping in the experiment process can be effectively avoided, the clamp is convenient to disassemble, the operation time is saved, and the accuracy of test data is ensured; the vulcanization mold is provided with a plurality of groups of vulcanization chambers, so that the sample obtaining efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the field of rubber mechanics measurement specimens and instruments, in particular to a specimen used for rubber crack extension measurement, a vulcanization mold of the specimen and a clamp. Background Art

[0002] The rubber fatigue crack growth tester is used to study the crack growth rate of vulcanized rubber under different tear energy densities under cyclic stress and strain and a certain number of cycles. It can quickly study the characteristics of cracks in various stages of tire materials under different formulation systems. In the experimental stage, the fatigue characteristics of the formulation can be evaluated and the service life of rubber products can be predicted, which greatly shortens the R&D cycle and ensures the safety and reliability of rubber products.

[0003] The main unit of the equipment has a maximum loading test space of 660 mm, a peak load of ±3000N, and a frequency of 0.001-100Hz. It can perform static stretching, dynamic fatigue, multi-step loading and other module tests. The original planar tensile fixture required repeated tightening of multiple screws to clamp the specimen, which was time-consuming and labor-intensive. If the screws were not tightened, the specimen would easily slip, the amplitude would not meet the control requirements, the experimental curve would be abnormal, and the experimental result data would be easily distorted. Summary of the invention

[0004] The utility model aims at the deficiencies of the prior art and provides a sample, a vulcanization mold and a fixture for measuring rubber crack extension. The fixture can effectively prevent the sample from slipping, save operation time and ensure the accuracy of test data.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] A sample for measuring rubber crack extension, wherein the middle part of the sample is rectangular rubber, and two long sides of the rectangle are extended with cylindrical rubber, and the thickness of the rectangular rubber is smaller than the diameter of the cylindrical rubber.

[0007] Preferably, the cylindrical rubber radius of the sample is 2.8-3.2 mm.

[0008] Furthermore, the utility model also provides a vulcanization mold for a sample, which is used to vulcanize the sample as described above, and includes an upper mold and a lower mold, wherein the inner sides of the upper mold and the lower mold are provided with multiple groups of corresponding semi-vulcanization chambers, which form multiple groups of complete vulcanization chambers when the molds are closed; the long sides of both sides of the semi-vulcanization chambers are provided with first arc ribs, which form complete cylinders when the molds are closed; the periphery of the semi-vulcanization chamber of the lower mold is provided with criss-crossing overflow grooves, and some of the overflow grooves pass through the edge of the lower mold for receiving overflowed rubber.

[0009] Preferably, the semi-vulcanization chambers are arranged in parallel.

[0010] Preferably, mold starting grooves are provided on the left and right sides of the upper mold.

[0011] Preferably, handles are provided on the front and rear sides of the lower mold.

[0012] Preferably, the upper mold and the lower mold are both provided with corresponding cylindrical pin holes penetrating the molds.

[0013] Furthermore, the utility model also provides a clamp for a sample, which is used to clamp the sample as described above, and includes a clamp body and a clamping block, wherein the clamping block includes a first clamping block and a second clamping block, the first clamping block is fixedly connected to the clamp body, and the second clamping block is detachably connected to the first clamping block, and the first clamping block and the second clamping block are both provided with a second arc rib, forming a complete cylinder when the mold is closed.

[0014] Preferably, the inner side surfaces of the first clamping block and the second clamping block are provided with a plurality of screw holes, and the screw holes are located above the second arc rib.

[0015] Preferably, the clamp body is provided with a plurality of circular holes.

[0016] The utility model provides an improved sample for measuring crack extension in rubber, a vulcanization mold and a fixture of the sample. By adopting the sample and the fixture, cracking of the sample jaws and slipping of the sample during the experiment can be effectively avoided, and the fixture is easy to disassemble, which saves operation time and ensures the accuracy of test data. The vulcanization mold is provided with multiple groups of vulcanization chambers, which can improve the efficiency of obtaining the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the sample.

[0018] Figure 2 It is a schematic diagram of the overall structure of the vulcanization mold.

[0019] Figure 3 It is a schematic diagram of the structure of the upper mold in the vulcanization mold.

[0020] Figure 4 It is a schematic diagram of the structure of the lower mold in the vulcanization mold.

[0021] Figure 5 A schematic diagram of the fixture structure.

[0022] Figure markings: 1-upper mold, 11-mold starting groove, 2-lower mold, 21-glue overflow groove, 22-handle, 3-semi-vulcanization chamber, 31-first arc rib, 4-cylindrical pin hole, 5-clamp body, 6-clamping block, 61-first clamping block, 62-second clamping block, 63-screw hole, 7-second arc rib. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the technical solutions in the embodiments of the utility model in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0024] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] Example 1

[0026] like Figure 1 A sample for measuring rubber crack extension is shown, the middle part of the sample is rectangular rubber, and cylindrical rubber is extended from two long sides of the rectangle. The thickness of the rectangular rubber is smaller than the diameter of the cylindrical rubber, and the radius of the cylindrical rubber of the sample is 3.0 mm.

[0027] like Figure 2-4 The vulcanization mold of the above-mentioned sample is shown, and the vulcanization mold is used to vulcanize the sample as described above. The vulcanization mold includes an upper mold 1 and a lower mold 2, and the inner sides of the upper mold 1 and the lower mold 2 are both provided with multiple groups of corresponding semi-vulcanization chambers 3, and the semi-vulcanization chambers 3 are all arranged in parallel, and when the mold is closed, multiple groups of complete vulcanization chambers are formed. In this embodiment, five groups of vulcanization chambers are arranged.

[0028] The first arc ribs 31 are arranged on both long sides of the semi-vulcanized chamber 3, which form a complete cylinder when the mold is closed, that is, the cylindrical rubber on the two long sides of the sample. The semi-vulcanized chamber 3 of the lower mold 2 is surrounded by crisscrossed overflow grooves 21, and some overflow grooves 21 pass through the edge of the lower mold 2 to receive overflowed rubber.

[0029] The left and right sides of the upper mold 1 are provided with mold starting grooves 11, and the front and rear sides of the lower mold 2 are provided with handles 22, which are used together to facilitate mold opening.

[0030] The upper mold 1 and the lower mold 2 are both provided with corresponding cylindrical pin holes 4 penetrating the molds for fixing when the molds are closed.

[0031] Example 2

[0032] like Figure 5A clamp for the sample described in Example 1 is shown, and the clamp is used to clamp the sample described in Example 1. The clamp includes a clamp body 5 and a clamping block 6, and the clamping block 6 includes a first clamping block 61 and a second clamping block 62. The first clamping block 61 is fixed to the clamp body 5, and the second clamping block 62 is detachably connected to the first clamping block 61. The first clamping block 61 and the second clamping block 62 are both provided with a second arc rib 7, which forms a complete cylinder when the mold is closed, and the cylindrical cavity is used to clamp the cylindrical rubber part of the sample.

[0033] A plurality of screw holes 63 are provided on the inner side surfaces of the first clamping block 61 and the second clamping block 62 . The screw holes 63 are located above the second arc rib 7 , which facilitates disassembly.

[0034] The clamp body 5 is also provided with a plurality of circular holes, which can effectively reduce the overall weight of the clamp.

[0035] The above is a description of the embodiments of the utility model. Through the above description of the disclosed embodiments, professionals and technicians in the field can implement or use the utility model. Various modifications to these embodiments will be obvious to professionals and technicians in the field. The general principles defined in this article can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to these embodiments shown in this article, but will conform to the widest range consistent with the principles and novelties disclosed in this article.

Claims

1. A sample for measuring crack growth in rubber, characterized in that: The middle part of the sample is a rectangular rubber, and two long sides of the rectangle are extended with cylindrical rubbers, and the thickness of the rectangular rubber is smaller than the diameter of the cylindrical rubber.

2. The sample according to claim 1, characterized in that The cylindrical rubber radius of the test specimen is 2.8-3.2 mm.

3. A vulcanization mold for a sample, characterized in that: The vulcanization mold is used for vulcanization to obtain the sample as claimed in claim 1 or 2, comprising an upper mold (1) and a lower mold (2), wherein the inner side surfaces of the upper mold (1) and the lower mold (2) are provided with a plurality of groups of corresponding semi-vulcanization chambers (3), which form a plurality of groups of complete vulcanization chambers when the molds are closed; the long sides of both sides of the semi-vulcanization chamber (3) are provided with first arc ribs (31), which form a complete cylinder when the molds are closed; the periphery of the semi-vulcanization chamber (3) of the lower mold (2) is provided with criss-crossing overflow grooves (21), and some of the overflow grooves (21) pass through the edge of the lower mold (2).

4. The vulcanization mold according to claim 3, characterized in that: The semi-sulfurization chambers (3) are all arranged in parallel.

5. The vulcanization mold according to claim 3, characterized in that: Mould starting grooves (11) are provided on the left and right sides of the upper mould (1).

6. The vulcanization mold according to claim 3, characterized in that: Handles (22) are provided on the front and rear sides of the lower mold (2).

7. The vulcanization mold according to claim 3, characterized in that: The upper mold (1) and the lower mold (2) are both provided with corresponding cylindrical pin holes (4) penetrating the molds.

8. A sample fixture, characterized in that: The clamp is used to clamp the sample as claimed in claim 1 or 2, and comprises a clamp body (5) and a clamping block (6), wherein the clamping block (6) comprises a first clamping block (61) and a second clamping block (62), wherein the first clamping block (61) is fixedly connected to the clamp body (5), and the second clamping block (62) is detachably connected to the first clamping block (61), and the first clamping block (61) and the second clamping block (62) are both provided with a second arc rib (7), so as to form a complete cylinder when the mold is closed.

9. The clamp according to claim 8, characterized in that The inner side surfaces of the first clamping block (61) and the second clamping block (62) are provided with a plurality of screw holes (63), and the screw holes (63) are located above the second arc rib (7).

10. The clamp according to claim 8, characterized in that The clamp body (5) is provided with a plurality of circular holes.

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