Device and method for detecting volume weight of flexible porous material

Abstract

The invention relates to the technical field of material volume weight detection devices, and particularly discloses a flexible porous material volume weight detection device and method, and the device comprises a bearing part which is used for placing a to-be-detected material; wherein in the length direction of the to-be-detected material, the plurality of bearing parts are arranged below the to-be-detected material at fixed intervals; the load detection part is used for detecting the load change of the bearing part; by using the device and the method, the volume weight of the to-be-detected material can be quickly, simply and conveniently measured, the to-be-detected material cannot be damaged, the volume weight of each product on a production line can be detected, and the quality control of the products can be effectively improved; besides, a terahertz wave detector does not need to be used, the overall cost of the detection device can be effectively reduced, the thickness of the to-be-detected material is not limited, and volume weight detection can be effectively carried out on the to-be-detected materials with different thicknesses.

Description

Technical Field

[0001] The present invention relates to the technical field of bulk density detection devices for materials, and in particular to a bulk density detection device and method for flexible porous materials. Background Art

[0002] In the production process of materials for certain products (such as polyurethane materials and latex materials), it is necessary to measure the bulk density of flexible porous materials. The bulk density of flexible porous materials can be used to reflect the pore forming conditions of the flexible materials, so as to determine whether the flexible porous materials meet the production requirements.

[0003] Existing detection methods include:

[0004] Method 1, the water displacement method, measures the bulk density by the difference between the weight of the material to be tested after it is filled with water and the dry weight;

[0005] Method 2: terahertz wave detector detection method, which uses terahertz waves to directly detect the delamination, pores and inclusions of the material to be tested non-destructively.

[0006] However, method 1 is a destructive test and cannot test every product on the production line, which is not conducive to product quality control and takes a long time to test.

[0007] For method 2, the terahertz wave detector is complex and precise, and has a high cost. In addition, the terahertz wave detector has a limited recognition thickness and can only recognize materials with a thickness of about 6 mm, which limits the detection range. Summary of the Invention

[0008] In view of the above problems, the present invention provides a device and method for detecting the bulk density of flexible porous materials, the purpose of which is to improve the efficiency of bulk density detection of materials and reduce the cost of bulk density detection.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0010] A flexible porous material bulk density detection device is provided, comprising: a load-bearing component for placing the material to be detected; wherein, along the length direction of the material to be detected, a plurality of load-bearing components are arranged below the material to be detected at fixed intervals; and a load detection component for detecting load changes of the load-bearing component.

[0011] Furthermore, the bearing component includes: a primary rod and a secondary rod installed in parallel, the primary rod is placed below the secondary rod, and the secondary rod is used to carry the material to be tested; a secondary support, installed at both ends of the secondary rod, and the secondary support is placed on the primary rod; a primary support, installed at both ends of the primary rod; wherein, the two secondary supports on a primary rod are symmetrically arranged; and the load detection component is arranged below the primary support.

[0012] Furthermore, the secondary support is fixedly installed on the primary rod, the secondary rod is hingedly installed on the secondary support, and the primary rod is hingedly installed on the primary support.

[0013] Furthermore, the load detection component is a pressure sensor.

[0014] Furthermore, the device also includes a slide rail, which is installed along the length direction of the material to be tested; wherein a plurality of bearing components are slidably installed on the slide rail.

[0015] Furthermore, the device also includes: a flexible pad, which is laid between the bearing component and the material to be detected.

[0016] Furthermore, a method for detecting the bulk density of a flexible porous material is provided, comprising the following steps: S1. dividing the material to be detected into n sections; S2. determining the distance between two adjacent load-bearing components; S3. selecting the specifications of the load detection component; S4. obtaining the density ρ1-ρ of each section of the material to be detected. n ; S5. Evaluate whether the production process needs to be optimized based on the density of each section of material to be tested.

[0017] Furthermore, whether the production process needs to be optimized is evaluated based on the mean value and sample variance of the density of the n sections of the material to be tested.

[0018] Furthermore, m materials to be tested are taken, and steps S1 to S4 are repeated for each material to be tested; a distribution morphology evaluation method is used to evaluate whether the production process needs to be optimized based on the skewness of the density of the m materials to be tested.

[0019] Furthermore, the formula for calculating the mean value of the density of each material to be tested divided into n segments is: in, is the mean density of each material to be tested, ρ i is the density of each section of the material to be tested, n is the number of sections of each material to be tested; the sample variance calculation formula for the density of each material to be tested divided into n sections is: Among them, s 2 is the sample variance of the density of the material to be tested in n segments, ρ i is the density of each section of the material to be tested, The density mean of each material to be tested, n is the number of segments of each material to be tested; the overall mean density calculation formula of m materials to be tested is: Wherein, μ is the overall mean of the density of m materials to be tested; is the mean density of each material to be tested; m is the number of materials to be tested; the formula for calculating the overall standard deviation of the density of m materials to be tested is: Where σ is the overall standard deviation of the density of m materials to be tested; is the density mean of each material to be tested; μ is the overall mean of the density of m materials to be tested; m is the number of materials to be tested; the skewness calculation formula for the density of m materials to be tested is: Where m is the number of materials to be tested, is the density mean of each material to be tested; μ is the overall mean of the density of m materials to be tested; σ is the overall standard deviation of the density of m materials to be tested.

[0020] The beneficial effects of the present invention are as follows: by using the present invention, the bulk density of the material to be tested can be measured quickly and easily without causing damage to the material to be tested itself, and the bulk density of each product on the production line can be tested, which can effectively improve the quality control of the product; in addition, the present invention does not require the use of a terahertz wave detector, which can effectively reduce the overall cost of the detection device, and the thickness of the material to be tested is not limited, and the bulk density of materials to be tested with different thicknesses can be effectively tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front view of the overall structure of the detection device provided in Example 1 of the present application.

[0022] Figure 2 This is a side view of the overall structure of the detection device provided in Example 1 of the present application.

[0023] Figure 3 Schematic diagram of the detection process provided in Example 2 of the present application.

[0024] Among them, 1. material to be tested; 2. load detection component; 31. primary support; 32. secondary support; 41. primary rod; 42. secondary rod; 5. slide rail; 6. flexible pad. DETAILED DESCRIPTION

[0025] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0026] Example 1

[0027] Reference Figure 1 and Figure 2 As shown, an embodiment of the present application discloses a flexible porous material bulk density detection device, comprising: a load-bearing component for placing the material 1 to be detected; wherein, along the length direction of the material to be detected 1, several load-bearing components are arranged at a fixed distance below the material to be detected 1; and a load detection component 2 for detecting the load change of the load-bearing component.

[0028] In the present invention, the material to be tested 1 is divided into several sections along the length direction of the material to be tested 1, and several bearing components are respectively located under each section of the material to be tested 1. The gravity value of each section of the material to be tested 1 is measured by the load detection component 2, and the bulk density of each section of the material to be tested 1 can be calculated, thereby evaluating whether the material to be tested 1 as a whole meets the production requirements.

[0029] By using the present invention, the bulk density of the material to be tested 1 can be measured quickly and easily without causing damage to the material to be tested 1 itself. The bulk density of each product on the production line can be tested, which can effectively improve the quality control of the product. In addition, the present invention does not require the use of a terahertz wave detector, which can effectively reduce the overall cost of the detection device. The thickness of the material to be tested 1 is not limited, and the bulk density of materials to be tested 1 of different thicknesses can be effectively tested.

[0030] Specifically, the bearing components include: a primary rod 41 and a secondary rod 42 installed in parallel, the primary rod 41 is placed below the secondary rod 42, and the secondary rod 42 is used to carry the material 1 to be tested; a secondary support 32, installed at both ends of the secondary rod 42, and the secondary support 32 is placed on the primary rod 41; a primary support 31, installed at both ends of the primary rod 41; wherein, the two secondary supports 32 on one primary rod 41 are symmetrically arranged; the load detection component 2 is arranged below the primary support 31.

[0031] Preferably, the secondary support 32 is fixedly mounted on the primary rod 41 , the secondary rod 42 is hingedly mounted on the secondary support 32 , and the primary rod 41 is hingedly mounted on the primary support 31 .

[0032] Preferably, the load detection component 2 is a pressure sensor, and a pressure sensor is provided at each end of a primary rod 41 .

[0033] Specifically, the material 1 to be tested is carried by the secondary rod 42, and the gravity of the material 1 to be tested is evenly distributed on the two secondary supports 32, and is evenly transmitted to the two primary supports 31 through the primary rod 41, thereby ensuring the accuracy of the data during the entire testing process; a pressure sensor primary rod 41 is provided at both ends of the primary rod 41.

[0034] By detecting the value change of the pressure sensor before and after the material 1 to be tested is placed, the load change of the bearing component can be obtained.

[0035] In the present invention, a secondary support and a primary support are provided, and the size restriction on the volume of the material to be measured can be removed through two-stage support detection.

[0036] On the one hand, it can avoid deformation of the primary rod 41 (for example, the bottom of the pressure sensor is uneven) which may affect the accuracy of pressure measurement of the secondary support.

[0037] On the other hand, it is more convenient to use, and the specifications of the secondary rod 42 and the secondary support can be flexibly changed to meet the measurement requirements of materials to be tested with different qualities and sizes.

[0038] It can be understood that the bulk density of each section of the object γ = 2F / V, where γ is the bulk density of the section of material 1 to be tested; F is the load change detected by the pressure sensor of the section of material 1 to be tested; and V is the volume of the section of material 1 to be tested.

[0039] Specifically, the device further includes a slide rail 5 , which is installed along the length direction of the material 1 to be tested; wherein a plurality of bearing components are slidably installed on the slide rail 5 .

[0040] In some embodiments, the slide rail 5 may be an I-shaped rail, on which a slide seat is slidably provided, the pressure sensor is disposed on the slide seat, and the primary support 31 is disposed above the pressure sensor.

[0041] It is worth mentioning that by moving the bearing component on the slide rail 5, the segment spacing between each section of the material to be tested 1 can be infinitely refined, thereby realizing the full-section measurement of the material to be tested 1, and the measurement accuracy can be flexibly improved according to different production requirements.

[0042] Preferably, the device further comprises: a flexible pad 6 laid between the bearing component and the material to be detected 1.

[0043] It is worth mentioning that for flexible porous materials such as polyurethane materials or latex materials, the material to be tested 1 can be placed on a supporting component with a bracket, and bulk density testing can be performed to reflect the pore formation of the porous flexible material.

[0044] In addition, for concrete materials, a flexible pad 6 can be laid on the bearing component first, and then the concrete material can be placed on the flexible pad 6. The flexible pad 6 can be used to evenly distribute the gravity of the concrete material on each bearing component, thereby realizing the detection of the bulk density of the concrete material.

[0045] It is worth mentioning that the flexible pad 6 can be a soft leather pad for measurement.

[0046] Preferably, the measuring soft pad is composed of two layers of materials. The bottom of the measuring soft pad is a force transmission structure support, which can be a rod or a hard pad; soft rubber is set on the upper part of the measuring soft pad, which can make the concrete material evenly transmit force to the hard pad / rod, and then transmit force to the secondary rod 42, thereby measuring the weight.

[0047] Preferably, the bottom of the measuring soft leather pad is a hot-dip galvanized thin steel plate, and the upper part is a fixed thickness of silicone. The bottom hot-dip galvanized thin steel plate acts as the mold bottom plate in the silicone molding, and plays a force transmission role in the structure, ensuring that the material to be tested with high hardness (such as concrete) evenly transmits force to each load-bearing component.

[0048] Example 2

[0049] Reference Figure 3 As shown, in this embodiment, a method for detecting the bulk density of a flexible porous material is also provided, comprising the following steps: S1. dividing the material 1 to be detected into n segments; S2. determining the distance between two adjacent load-bearing components 2; S3. selecting the specifications of the load detection component 2;

[0050] S4. Obtain the density ρ1-ρ of each section of the material to be tested 1 n ; S5. Evaluate whether the production process needs to be optimized based on the density of each section of material 1 to be tested.

[0051] Furthermore, whether the production process needs to be optimized is evaluated based on the mean value and sample variance of the density of the n sections of the material 1 to be tested.

[0052] Furthermore, m materials 1 to be tested are taken, and steps S1 to S4 are repeated for each material 1 to be tested; a distribution morphology evaluation method is used to evaluate whether the production process needs to be optimized based on the skewness of the density of the m materials 1 to be tested.

[0053] The calculation formula for the mean value of the density 1 of each material to be tested divided into n segments is:

[0054]

[0055] in, is the mean density of each material to be tested 1, ρ i is the density of each section of the material 1 to be tested, and n is the number of sections of each material 1 to be tested;

[0056] The formula for calculating the sample variance of the density 1 of each material to be tested divided into n segments is:

[0057]

[0058] Among them, s 2 is the sample variance of the density 1 of the material to be tested in n segments, ρ i is the density of each section of material 1 to be tested, is the mean density of each material 1 to be tested, and n is the number of segments of each material 1 to be tested;

[0059] The formula for calculating the overall mean of the density of m materials to be tested is:

[0060]

[0061] Wherein, μ is the overall mean of the density of m materials to be tested; is the mean density of each material 1 to be tested; m is the number of materials 1 to be tested;

[0062] The formula for calculating the population standard deviation of the density of m materials to be tested is:

[0063]

[0064] Wherein, σ is the population standard deviation of the density of m materials to be tested; is the density mean of each material 1 to be tested; μ is the overall mean of the density of m materials 1 to be tested; m is the number of materials 1 to be tested;

[0065] The formula for calculating the skewness of the density of m materials to be tested is:

[0066]

[0067] Where m is the number of materials to be tested. is the density mean of each material 1 to be tested; μ is the overall mean of the densities of m materials 1 to be tested; σ is the overall standard deviation of the densities of m materials 1 to be tested.

[0068] It is worth mentioning that in actual production, the theoretical design density and tolerance range of the material 1 to be tested will be specified in advance based on process technology and existing product data.

[0069] In the present invention, whether a single product is qualified is determined by judging whether the mean value of the density of the material to be tested 1 falls within the theoretical range and considering the fluctuation of the sample variance.

[0070] It is worth mentioning that in actual production, the theoretical skewness and tolerance range of the material 1 to be tested will be specified in advance based on process technology and existing product data.

[0071] Among them, the closer the actual skewness is to 0, the closer the actual skewness is to the theoretical skewness in a normal distribution; the larger the absolute value of the actual skewness is, the further the actual skewness is from the theoretical skewness.

[0072] In the present invention, by judging whether the skewness of the material 1 to be tested falls within the theoretical range, it is judged whether there is a systematic deviation in the production process, so as to judge the overall uniformity of the products on the production line and whether the products on the production line as a whole meet the production requirements; when the skewness does not fall within the theoretical tolerance, it indicates that there are extreme values ​​in the data; it is necessary to check and verify whether the equipment and steps involved in the production process comply with the production regulations; different steps and equipment can be accurately verified.

[0073] Example 3

[0074] In this embodiment, the material 1 to be tested is a foam material, and the bulk density of the foam material is measured to evaluate the uniformity of the foam material.

[0075] In this embodiment, the foaming material is latex.

[0076] Preferably, two pieces of latex with a size of 2mx2mx0.2m are taken for measurement. Five bearing components are set under each piece of latex, which are numbered as specimen 1 and specimen 2. The specific measurement results are as follows:

[0077]

[0078] Among them, the latex adopts physical foaming technology, and the latex material obtained is greater than 100kg / m 3 , the density is larger, harder, and the density variance of specimen 1 is larger. It can be seen that the uniformity of specimen 1 is poor. The recommended latex density in production is 75-85kg / m 3 Therefore, it is necessary to improve and optimize the physical foaming technology.

[0079] It can be seen that by using the method provided by the present invention, the bulk density of the materials to be tested on the production line can be quickly and accurately tested, a theoretical basis can be provided for the optimization of the production process, and the quality control of the products on the production line can be effectively improved.

[0080] It will be understood by those skilled in the art that although preferred embodiments of the present invention have been described, further changes and modifications may be made to these embodiments once those skilled in the art are aware of the underlying inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, the present invention is intended to include such changes and modifications as fall within the scope of the claims and equivalents of the present invention.

Claims

1. A flexible porous material bulk density detection device, characterized in that: include: A carrying component for placing the material to be tested (1); Wherein, along the length direction of the material to be detected (1), a plurality of bearing components are arranged below the material to be detected (1) at fixed intervals; The load detection component (2) is used to detect the load change of the bearing component.

2. The flexible porous material bulk density detection device according to claim 1, characterized in that: The load-bearing components include: A primary rod (41) and a secondary rod (42) are installed in parallel, the primary rod (41) is placed below the secondary rod (42), and the secondary rod (42) is used to carry the material to be tested (1); The secondary supports (32) are mounted on both ends of the secondary rod (42), and the secondary supports (32) are placed on the primary rod (41); The first-level support (31) is installed at both ends of the first-level rod (41); wherein, the two second-level supports (32) on one first-level rod (41) are symmetrically arranged; and the load detection component (2) is arranged below the first-level support (31).

3. The flexible porous material bulk density detection device according to claim 2, characterized in that: The secondary support (32) is fixedly mounted on the primary rod (41), the secondary rod (42) is hingedly mounted on the secondary support (32), and the primary rod (41) is hingedly mounted on the primary support.

4. The flexible porous material bulk density detection device according to claim 1, characterized in that: Load detection component (2) pressure sensor.

5. The flexible porous material bulk density detection device according to claim 1, characterized in that: It also includes a slide rail (5) which is installed along the length direction of the material to be tested (1); wherein a plurality of bearing components are slidably installed on the slide rail (5).

6. The flexible porous material bulk density detection device according to claim 1, characterized in that: Also includes: A flexible pad (6) is laid between the bearing component and the material to be tested (1).

7. A detection method based on the flexible porous material bulk density detection device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Divide the material to be tested (1) into n segments; S2. Determine the spacing between two adjacent bearing members (2); S3. Select the specifications of the load detection component (2); S4. Obtain the density ρ1-ρ of each section of the material to be tested (1) n ; S5. Evaluate whether the production process needs to be optimized based on the density of each section of the material to be tested (1).

8. The method for detecting bulk density of flexible porous materials according to claim 7, characterized in that: The density mean and sample variance of n sections of the material to be tested (1) are used to evaluate whether the production process needs to be optimized.

9. The method for detecting bulk density of flexible porous materials according to claim 8, characterized in that: Take m materials to be tested (1), and repeat steps S1-S4 for each material to be tested (1); adopt a distribution morphology evaluation method to evaluate whether the production process needs to be optimized based on the skewness of the density of the m materials to be tested (1).

10. The method for detecting bulk density of flexible porous materials according to claim 9, characterized in that: The formula for calculating the mean value of the density (1) of each material to be tested divided into n segments is: in, is the mean density of each material to be tested (1), ρ i is the density of each section of the material to be tested (1), and n is the number of sections of each material to be tested (1); The sample variance calculation formula for the density of each material to be tested (1) divided into n segments is: Among them, s 2 is the sample variance of the density (1) of the material to be tested in n segments, ρ i is the density of each section of the material to be tested (1), is the density mean of each material to be tested (1), and n is the number of segments of each material to be tested (1); The formula for calculating the overall mean of the density of m materials to be tested (1) is: Wherein, μ is the overall mean of the density of m materials to be tested (1); is the mean density of each material to be tested (1); m is the number of materials to be tested (1); The formula for calculating the overall standard deviation of the density of m materials to be tested (1) is: Where, σ is the population standard deviation of the density of m materials to be tested (1); is the density mean of each material to be tested (1); μ is the overall mean of the density of m materials to be tested (1); m is the number of materials to be tested (1); The formula for calculating the skewness of the density of m materials to be tested (1) is: Wherein, m is the number of materials (1) to be tested, is the density mean of each material to be tested (1); μ is the overall mean of the density of m materials to be tested (1); σ is the overall standard deviation of the density of m materials to be tested (1).

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