Simple measuring device for elastic modulus of rubber part

Abstract

The utility model discloses a simple measuring device for the elasticity modulus of a rubber part, which comprises a base, a digital display altimeter is arranged on the base, a bottom plate for placing a rubber sample piece to be measured is also arranged on the base, a pressing plate is arranged above the rubber sample piece to be measured, the digital display altimeter comprises a dial indicator, and a measuring pin of the dial indicator is propped against the upper surface of the pressing plate. According to the utility model, the structure is simple, the arrangement of the dial indicator, the pressing plate, the hook and the double-hook weight helps a worker to obtain the elastic modulus of the rubber sample piece to be measured, and the measuring tool is easy to manufacture, low in cost, simple and uncomplicated to operate, low in professional requirement for the operator, capable of being operated by hand after demonstration once, and almost free of potential safety hazards; the numerical value can be directly read or obtained through simple addition and subtraction, the device is simple, reliable, convenient to move and not prone to damage, and compared with a method for calculating the elastic modulus by measuring stress and strain through a professional computer system, the manufacturing cost and the personnel training cost are greatly reduced, and the economic advantage is obvious.

Description

Technical Field

[0001] This utility model relates to the field of elastic modulus device technology, specifically a simple measuring device for the elastic modulus of rubber parts. Background Technology

[0002] In the design and manufacture of oil-free scroll compressors, sealing rings are typically installed on the profiled end faces of the scroll body to improve volumetric efficiency and reduce axial gas leakage. However, with prolonged compressor operation, these sealing rings wear down due to continuous contact and friction. This not only weakens the sealing performance but can also cause additional frictional losses, thereby affecting the overall efficiency and service life of the compressor. To address this issue, our research team has developed a method that involves placing a rubber elastic strip beneath the sealing strip. This utilizes the excellent elasticity and resilience of rubber to achieve automatic compensation after the sealing strip wears, thus maintaining the sealing effect while reducing performance degradation caused by wear.

[0003] However, in practical applications, it has been found that the elastic force of the rubber elastic strip has a direct impact on the performance of the entire system. If the elastic force of the rubber is too large, it will not only fail to effectively compensate for the wear of the sealing strip, but will also accelerate the wear rate of the sealing strip and increase the frictional power consumption during compressor operation. Therefore, it is necessary to accurately measure the elastic modulus of the rubber elastic strip during the design stage to select a suitable rubber material and ensure that it provides appropriate elastic force during compressor operation. Existing methods for testing the elastic modulus of rubber components, such as the technical solution described in patent CN109490090A, while capable of basic measurement of the elastic modulus of rubber components, have certain limitations in operation. For example, the dual dial gauge reading method used in this solution requires frequent adjustments to ensure consistency between the two readings, which not only increases the difficulty of the experiment but may also lead to inaccurate measurement results. Furthermore, while the method of stacking weights on top of the rubber specimen is simple and intuitive, it easily causes a shift in the center of gravity, resulting in uneven pressure distribution at different locations on the rubber component and affecting the final measurement accuracy. Therefore, it is necessary to develop a simple device for measuring the elastic modulus of rubber components. Utility Model Content

[0004] The purpose of this invention is to provide a simple device for measuring the elastic modulus of rubber parts, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a simple measuring device for the elastic modulus of rubber parts, comprising a base, on which a digital height gauge is mounted, and a base plate for placing a rubber sample to be measured is also provided on the base. A pressure plate is provided above the rubber sample to be measured. The digital height gauge includes a dial indicator, the probe of which rests against the upper surface of the pressure plate. A hook is detachably mounted on the bottom surface of the pressure plate, and the end of the hook away from the pressure plate extends to the bottom of the base.

[0006] As a further embodiment of this invention, the digital altimeter also includes a bracket, which is connected to a dial indicator.

[0007] As a further embodiment of this utility model: the side of the base is provided with a groove, and the end of the hook passes through the groove.

[0008] As a further embodiment of this utility model: the base plate is provided with a circular hole, through which the end of the hook passes.

[0009] As a further embodiment of this utility model, the hook is provided with double-hook weights.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] This application utilizes a dial indicator, pressure plate, hook, and double-hook weights to help workers determine the elastic modulus of a rubber sample. The measuring fixture is simple in structure, easy to manufacture, low in cost, and simple to operate. It requires minimal technical expertise from operators; a single demonstration is sufficient to learn how to use it, and it poses virtually no safety hazards. Values ​​can be directly read or obtained through simple addition and subtraction. The device is simple, reliable, easy to move, and not easily damaged. Compared to using professional computer systems to measure stress and strain to calculate the elastic modulus, this significantly reduces manufacturing and training costs, resulting in a clear economic advantage. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the simplified measuring device of this utility model;

[0013] Figure 2 This is a schematic diagram of the combination of the base plate, the rubber sample to be tested, and the pressure plate of this utility model;

[0014] Figure 3 This is a schematic diagram of the base of this utility model;

[0015] Figure 4 This is a schematic diagram of the base plate of this utility model;

[0016] Figure 5 This is a schematic diagram of the rubber sample to be tested according to this utility model;

[0017] Figure 6 This is a schematic diagram of the hook of this utility model;

[0018] In the diagram: 1. Digital height gauge; 2. Base; 21. Groove; 3. Base plate; 31. Circular hole; 4. Rubber sample to be tested; 5. Pressure plate; 51. Hook; 6. Double hook weight. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-6 In this embodiment of the present invention, a simple measuring device for the elastic modulus of a rubber component includes a base 2. The side of the base 2 is provided with a groove 21 for the end of a hook 51 to pass through. A digital height gauge 1 is installed on the base 2. The base 2 is also provided with a base plate 3 for placing the rubber sample 4 to be measured. The digital height gauge 1 and the base plate 3 are both located on the upper surface of the base 2 and are on the same surface, which is beneficial for subsequent measurement of the elastic modulus. A pressure plate 5 is provided above the rubber sample 4 to be measured. The area of ​​the lower surface of the pressure plate 5 is larger than the area of ​​the upper surface of the rubber sample 4 to be measured, which can effectively cover the rubber sample 4 to be measured during the measurement process and ensure the stability of the rubber sample 4 to be measured during the measurement process. The digital height gauge 1 includes a dial indicator. The probe of the dial indicator rests on the upper surface of the pressure plate 5. A hook 51 is detachably mounted on the bottom surface of the pressure plate 5. The end of the hook 51 away from the pressure plate 5 extends to the bottom of the base 2. A double-hook weight 6 is provided on the hook 51.

[0021] Specifically, place the digital height gauge 1 on the base 2, and also place the base plate 3 on the base 2. Place the rubber sample 4 to be tested on the base plate 3, press the pressure plate 5 onto the rubber sample 4, and assemble the hook 51. Then, place the dial indicator probe against the upper surface of the pressure plate 5, with the compression of the dial indicator probe slightly greater than the deformation of the rubber sample 4. Then, zero the dial indicator. Suspend double-hook weights 6 on the hooks 51 of the pressure plate 5. Different weights or quantities can be suspended according to the test requirements. Weigh the pressure plate 5 and hooks 51 together and record the weight m0. Then, record the weight m of the suspended weights 6. 1. The force F applied to the sample can be calculated using the formula F=mg, i.e., F=(m0+m1)g. At the same time, the deformation ε of the rubber sample 4 to be tested is recorded, which can be read from a dial gauge. In this way, the relationship between the sample pressure and the deformation can be obtained. The force-bearing area of ​​the rubber sample 4 to be tested is the entire upper surface. The force-bearing area can be obtained from the three-dimensional digital model of the sample or the actual two-dimensional measurement. Let its area be A. The stress σ of the rubber sample 4 to be tested under the force applied by the double hook weight 6 can be calculated using the formula σ=F / A. Finally, the elastic modulus E of the sample can be calculated using E=σ / ε.

[0022] Please see Figure 2 In one embodiment, preferably, the digital height gauge 1 further includes a bracket connected to a dial indicator.

[0023] Please see Figure 5 In one embodiment, preferably, the base plate 3 is provided with a round hole 31 for the end of the hook 51 to pass through. Furthermore, the rubber sample 4 to be tested needs to avoid the round hole 31 during placement, which helps the end of the hook 51 to pass through and be threadedly connected to the pressure plate 5.

[0024] The working principle and usage process of this utility model are as follows: First, place the rubber sample 4 to be tested on the base plate 3. During the placement process, it is necessary to avoid the round hole 31. Then, place the pressure plate 5 on the rubber sample 4 to be tested, and pass the end of the hook 51 through the base 2, the base plate 3 and the rubber sample 4 to be tested and threadedly connect it to the pressure plate 5. Next, compress the probe of the dial indicator. The compression amount of the probe must be greater than the elastic modulus of the rubber sample 4 to be tested. According to the test requirements, hang different weights or numbers of weights 6 and record the weight of the suspended weights 6. Finally, the elastic modulus of the rubber sample 4 to be tested is obtained through the formula.

[0025] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0026] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A simple device for measuring the modulus of elasticity of a rubber piece, comprising a base (2), characterized in that, The base (2) is provided with a digital height gauge (1), and the base (2) is further provided with a bottom plate (3) for placing a rubber sample (4) to be measured, and a pressing plate (5) is arranged above the rubber sample (4) to be measured, the digital height gauge (1) comprises a dial gauge, a measuring needle of the dial gauge abuts against an upper surface of the pressing plate (5), and a hook (51) is detachably arranged on a bottom surface of the pressing plate (5), and an end of the hook (51) extends to below the base (2) away from the pressing plate (5).

2. The simple modulus of elasticity measuring device for a rubber member according to claim 1, characterized by The digital height gauge (1) further comprises a support connected with the dial gauge.

3. The simple modulus of elasticity measuring device for a rubber member according to claim 1, characterized by The base (2) is provided with a groove (21) at a side edge, and the groove (21) is used for allowing the end of the hook (51) to pass through.

4. The simple modulus of elasticity measuring device for a rubber member according to Claim 1, characterized by The bottom plate (3) is provided with a round hole (31) for allowing the end of the hook (51) to pass through.

5. The simple modulus of elasticity measuring device for a rubber member according to Claim 1, wherein The hook (51) is provided with double-hooked weights (6).

Images