Performance testing machine for elastic material finished product

Abstract

The utility model belongs to the technical field of elastic material production, and discloses an elastic material finished product performance testing machine which comprises the following steps: step 1, sample piece manufacturing, step 2, sample piece testing and step 3, material judging and grouping. An elastic material ring testing machine comprises a base, the top of the base is fixedly provided with a stepping motor through a motor base, and the stepping motor is connected with the motor base; the end portion of an output shaft of the stepping motor is fixedly installed with one end of the screw rod, the other end of the screw rod is in threaded connection with one side of the sliding block, the sliding block is connected to the top of the sliding rail in a sliding mode, and the sliding rail is fixedly installed with the base. The stability and consistency of test results can be ensured, and the test results accurately correspond to product characteristics; the test method is simple and fast, is integrated in production process control and can be used for repeated detection.

Description

Technical Field

[0001] This utility model belongs to the field of elastic material production technology, and specifically relates to a performance testing machine for finished elastic materials. Background Technology

[0002] Currently, in the field of elastic material production, the inherent volatility of elastic materials makes it extremely difficult to control the proportions of raw materials during production. For example, the industry standard hardness manufacturing tolerance is typically around + / -3, which is insufficient to meet quality control requirements. Substandard inspection results also lead to product scrapping. For products requiring elastic properties, such as vibration dampers and sealing rings, it is necessary to conduct sample testing on the materials to be produced before production to check for deviations in the raw material proportions and to predict whether the performance will meet the expected requirements. However, existing testing methods have the following shortcomings.

[0003] 1. The drawback of elastomer hardness testing is that it has low precision and is affected by the process, belonging to post-process inspection / control.

[0004] 2. The drawbacks of tensile strength testing of elastomers are: insufficient stability, large differences in test results between different batches; destructive testing, not repeatable; and not directly related to the elastic properties of the product.

[0005] 3. Material modulus testing has the following drawbacks: the testing process is complex, expensive, and time-consuming; it requires expensive specialized equipment, complex sample preparation processes, and professional knowledge to operate and process the test results, making it unsuitable for production process control where materials are frequently changed and timely judgment is required.

[0006] Given these problems, a new type of equipment and testing method needs to be developed to solve them. Utility Model Content

[0007] In order to solve the above-mentioned problems in the existing technology, the purpose of this utility model is to provide a performance testing machine for elastic material products.

[0008] The technical solution adopted in this utility model is as follows:

[0009] A performance testing machine for elastic materials includes a base. A stepper motor is fixedly mounted on the top of the base via a motor base. The output shaft end of the stepper motor is fixedly mounted to one end of a screw. The other end of the screw is threadedly connected to one side of a slider. The slider is slidably connected to the top of a slide rail, which is fixedly mounted to the base. The side of the slider opposite to the screw is fixedly mounted to one end of a pull rod. The other end of the pull rod is fixedly mounted to one end of a tension sensor. The other end of the tension sensor is fixedly mounted to one end of a connecting rod. The other end of the connecting rod is fixedly connected to the displacement end of a tensioning mechanism. A displacement sensor is provided on one side of the tensioning mechanism. The test sample is placed inside the performance testing machine for elastic materials and subjected to tensioning. The displacement and tension values ​​are detected by the tension sensor and the displacement sensor.

[0010] Furthermore, the tensioning mechanism includes a sliding seat and a fixed seat. The fixed seat is fixedly installed on the top of the base, and the sliding seat is slidably connected to the top of the slide rail and is driven to move closer to or away from the fixed seat via a connecting rod.

[0011] Furthermore, both the sliding seat and the fixed seat are provided with a bracing block at their top, and the two bracing blocks form a cylindrical structure, with the test sample sleeved on the outside of the cylindrical structure.

[0012] Furthermore, a probe plate is fixedly installed on one side of the sliding seat corresponding to the displacement sensor, and the probe plate is aligned with the displacement sensor.

[0013] Furthermore, a processor, a memory, and a display are also provided on the top of the base.

[0014] Furthermore, the stepper motor, the tension sensor, the displacement sensor, the memory, and the display are all electrically connected to the processor via wires.

[0015] The beneficial effects of this utility model are as follows:

[0016] This invention, through the innovative design of the testing machine combined with testing, grading, and control methods, can accurately group products; it can effectively ensure the stability and consistency of test results and their precise correspondence with product characteristics; the testing method is simple and quick, integrated into the production process control, and can be repeatedly tested. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a performance testing machine for elastic materials.

[0018] Reference numerals in the attached figures; wherein, 1, base; 2, stepper motor; 3, motor base; 4, screw; 5, slide rail; 6, slider; 7, pull rod; 8, tension sensor; 9, support mechanism; 91, sliding seat; 92, fixed seat; 93, support block; 94, detection plate; 10, connecting rod; 11, displacement sensor; 12, memory; 13, processor; 14, test sample. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] Example:

[0021] like Figure 1 As shown, an elastic material finished product performance testing machine includes a base 1. A stepper motor 2 is fixedly installed on the top of the base 1 via a motor base 3. The output shaft end of the stepper motor 2 is fixedly installed to one end of a screw 4. The other end of the screw 4 is threadedly connected to one side of a slider 6. The slider 6 is slidably connected to the top of a slide rail 5. The slide rail 5 is fixedly installed to the base 1. The side of the slider 6 opposite to the screw 4 is fixedly installed to one end of a pull rod 7. The other end of the pull rod 7 is fixedly installed to one end of a tension sensor 8. The other end of the tension sensor 8 is fixedly installed to one end of a connecting rod 10. The other end of the connecting rod 10 is fixedly connected to the displacement end of a tensioning mechanism 9. A displacement sensor 11 is provided on one side of the tensioning mechanism 9. The test sample 14 is placed in the elastic material finished product performance testing machine for tensioning, and its displacement value and tension value are detected by the tension sensor 8 and the displacement sensor 11.

[0022] Furthermore, the tensioning mechanism 9 includes a sliding seat 91 and a fixed seat 92. The fixed seat 92 is fixedly installed on the top of the base 1, and the sliding seat 91 is slidably connected to the top of the slide rail 5 and is driven to move closer to or away from the fixed seat 92 via the connecting rod 10.

[0023] Furthermore, both the top of the sliding seat 91 and the fixed seat 92 are provided with a bracing block 93, and the two bracing blocks 93 form a cylindrical structure. The test sample 14 is fitted onto the outside of the cylindrical structure.

[0024] Furthermore, a probe plate 94 is fixedly installed on one side of the sliding seat 91 corresponding to the displacement sensor 11, and the probe plate 94 is aligned with the displacement sensor 11.

[0025] Furthermore, the top of the base is also equipped with a processor 13, a memory 12, and a display.

[0026] Furthermore, the stepper motor 2, tension sensor 8, displacement sensor 11, memory 12, and display are all electrically connected to the processor 13 via wires.

[0027] Specifically, the working principle of this testing machine is as follows: The stepping motor 2 drives the screw 4 to rotate, thereby driving the slider 6 that is slidably connected to the slide rail 55 to move linearly, which in turn drives the linkage of the pull rod 7, the tension sensor 8, and the connecting rod 10 to pull the sliding seat 91 of the tensioning mechanism 9 to displace, so as to separate and tension the test specimen 14 sleeved outside it through two sets of tensioning blocks 93, causing it to deform; at the same time, the displacement sensor 11 detects the displacement value of the sliding seat 91 driving the detection plate 94, and the tension sensor 8 collects the tension value generated during the process. Finally, it is calculated by the processor 13 and transferred to the memory 12 for storage, and finally displayed through the display.

[0028] At the same time, through the performance measurement and control method for finished elastic materials supporting this testing machine, the performance of the finished products is effectively controlled and classified, including the following steps:

[0029] The first step is to make test specimens 14 of standard types with the tested materials and produce them through a special transfer mold. 5 - 8 specimens are made per mold. The test specimens 14 are arranged in a circle in the mold to ensure consistent pressure and consistent flow process of material transfer and filling. The process parameters for specimen making (such as temperature, pressure) are kept consistent with those for making products.

[0030] The second step: After the test specimens 14 are cooled to room temperature for 2 hours, use the performance testing machine for finished elastic materials to test relatively soft elastic materials such as rubber or relatively hard materials such as polyurethane, etc.

[0031] Place the test specimens 14 in the testing machine to perform the detection. The testing machine stretches the specimens according to the program settings and reads the displacement and force values at the same time. The program of the processor 13 takes the difference between the force values at two displacement amounts set from small to large in advance as the final result of the test for this specimen.

[0032] Taking the T1 value of Material A in Table 1 below as an example, the force of Material A at the first point is read as 13N, and the force at the second point is read as 89N. Take their difference of 76 as the final result of the test.

[0033] For each group, 5 - 8 specimens are tested. The program of the processor 13 will automatically calculate and display the average value of the final results, which is defined here as the OST value, and at the same time give the deviation degree, that is, the CV value as a reference;

[0034] The CV value (Coefficient of Variation) is a relative index used to measure the degree of data dispersion. It is usually used to compare the degree of variation of different data sets or different measurement units because the CV value is dimensionless, that is, it eliminates the influence of data size or unit. The calculation formula of the CV value is the ratio of the standard deviation to the average value, expressed in percentage form.

[0035] The table below shows the test results of samples of different grades of a certain material. The first column is the material number, and T1-T5 are the test results of each sample:

[0036] The average value of a set of tests is taken as the test result of this material, namely the OST value, which is used to determine the grade and group. The purpose of taking the average value is that the properties of elastic materials are naturally fluctuating, and averaging can eliminate extreme values ​​and get closer to the true value.

[0037] The CV value is the deviation, defined as the standard deviation to the mean, used to measure the degree of deviation of the data.

[0038] For example, a CV value exceeding 5% indicates significant differences between samples, requiring retesting. This calculation aims to prevent errors in practical operation. Because the tested sample 14 cannot be distinguished by appearance, confusion caused by similar materials can deviate the true value from the test results. The alert serves as a reminder for testers to re-verify the samples and results.

[0039] Table 1

[0040]

[0041] The test results for the four sample materials in Table 1 are 7, 158, 313, and 461, respectively. These test results can be used to determine whether the batch of materials is qualified or how to make further adjustments. The deviation ranges from 0.8% to 2.1%, which is within a suitable range.

[0042] Step 3: Material identification and grouping:

[0043] The test results of the material (the OST value after averaging a set of tests) are used to determine the material's performance, group the materials, and predict and determine the characteristics of the final product made from this material.

[0044] Material grouping definitions can be predefined to classify different grades. For example, to control the stiffness of the final product within a range of + / -5%, the OST values ​​can be grouped according to the definitions in Table 2 as follows:

[0045] Table 2

[0046]

[0047] For example, materials A, B, C, and D in the test belong to groups 4, 12, 19, and 23 (grades), respectively. Finished products made from materials in the same group exhibit stiffness characteristics that fluctuate within + / - 5%. This method can distinguish approximately 30 grades, thus allowing for more precise control over product performance.

[0048] Under the same conditions, if hardness is used as a control parameter, it is impossible to accurately distinguish between multiple grades. The Shore hardness range of commonly used rubber materials is about 30 to 75, and the industry's typical manufacturing tolerance is about + / -3, which can only classify materials into about 7-8 groups.

[0049] Alternatively, the target and range of the material's OST value can be determined based on product development and testing results, and used as the target for production control.

[0050] For example, if a product's material OST value meets the target stiffness requirement of 110, and to ensure that the stiffness variation in each batch of products is within 10%, the material's OST value should be between 99 and 121. If the measured value exceeds this range, the formula should be adjusted and the material re-prepared to avoid manufacturing substandard products and causing waste.

[0051] In situations where accurate control of material properties is required, such as in the manufacture of vibration dampers and sealing rings, this method and testing machine can ensure that the product properties meet the requirements, and the accuracy is higher than that of conventional measurement and control methods.

[0052] This method, through its testing, grading, and control approaches, allows for precise grouping; ensures stable and consistent test results that accurately correspond to product characteristics; and provides a simple, quick testing method that can be integrated into production process control and is repeatable.

[0053] This utility model is not limited to the above-mentioned optional embodiments. Anyone can derive other forms of products under the guidance of this utility model. However, regardless of any changes made in its shape or structure, any technical solution that falls within the scope of the claims of this utility model shall be protected by this utility model.

Claims

1. An elastomeric material finished product performance testing machine characterized by: The application relates to a tensioning and stretching testing device, which comprises a base (1), a stepping motor (2) fixedly installed on the top of the base (1) through a motor base (3), one end of an output shaft of the stepping motor (2) fixedly connected with one end of a screw rod (4), the other end of the screw rod (4) threadedly connected with one side of a sliding block (6), the sliding block (6) slidingly connected with the top of a sliding rail (5), the sliding rail (5) fixedly installed on the base (1), one side, opposite to the screw rod (4), of the sliding block (6) fixedly connected with one end of a pull rod (7), the other end of the pull rod (7) fixedly connected with one end of a tension sensor (8), the other end of the tension sensor (8) fixedly connected with one end of a connecting rod (10), the other end of the connecting rod (10) fixedly connected with a displacement end of a tensioning and stretching mechanism (9), one side of the tensioning and stretching mechanism (9) provided with a displacement sensor (11), the tensioning and stretching mechanism (9) put into a test sample (14) for tensioning and stretching, and the displacement value and the tension value of the test sample (14) detected through the tension sensor (8) and the displacement sensor (11).

2. The elastomeric material finished product performance testing machine of claim 1, wherein: The tensioning and stretching mechanism (9) comprises a sliding seat (91) and a fixed seat (92), the fixed seat (92) is fixedly installed on the top of the base (1), the sliding seat (91) is slidingly connected with the top of the sliding rail (5) and driven to approach or move away from the fixed seat (92) through the connecting rod (10).

3. The elastomeric finished product performance testing machine of claim 2, wherein: The top of the sliding seat (91) and the top of the fixed seat (92) are provided with tensioning and stretching blocks (93), the two tensioning and stretching blocks (93) form a cylindrical structure, and the test sample (14) is sleeved outside the cylindrical structure.

4. The elastomeric finished product performance testing machine of claim 3, wherein: One side, corresponding to the displacement sensor (11), of the sliding seat (91) is fixedly provided with a detection plate (94), and the detection plate (94) is aligned with the displacement sensor (11).

5. The elastomeric finished product performance testing machine of claim 4, wherein: The top of the base (1) is further provided with a processor (13), a memory (12) and a display.

6. The elastomeric finished product performance testing machine of claim 5, wherein: The stepping motor (2), the tension sensor (8), the displacement sensor (11), the memory (12) and the display are electrically connected with the processor (13) through wires.

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