Hardness standard bar of composite structure
By combining the inner liner and outer tube, the problem that existing hardness standard bars cannot meet various hardness testing needs is solved, enabling flexible adjustment of hardness values and reducing production costs, thus adapting to the testing needs of equipment with different ranges.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHENGZHOU TOBACCO RES INST OF CNTC
- Filing Date
- 2025-06-12
- Publication Date
- 2026-07-03
Smart Images
Figure CN224456356U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of standard instrument technology, and more specifically, to a hardness standard bar with a composite structure. Background Technology
[0002] Hardness standard bars are standard objects used to calibrate hardness testing instruments. They are characterized by stable surface geometric dimensions and can serve as a reference for the accuracy of hardness testing instruments. They are also used as calibration objects for the periodic calibration of hardness testing instruments, functioning similarly to "weights".
[0003] The national standard GB / T22838.5-2009 "Determination of Physical Properties of Cigarettes and Filter Rods" Part 6 is the determination of cigarette hardness, which specifies the definition of cigarette hardness as: H=(d / D)*100%, where d is the diameter after compression (mm) and D is the diameter before compression (mm). The determination of hardness H depends on the indentation a (a=Dd) of the rod after the radial pressure is applied by the pressure instrument. According to the formula, we can control the size of d while keeping D constant to achieve different hardness values.
[0004] Currently, in practical applications, hardness standard bars are made of hard materials and have a hardness value of only 100%. Bars with a hardness value between 0 and 100% that meet the requirements have not yet been successfully made. Therefore, it is necessary to develop a set of standard bars with a hardness gradient to meet metrological needs.
[0005] However, since different hardness testing equipment requires different hardness gradient ranges, it is difficult to find so many materials with different hardnesses to make different standard bars. Moreover, the demand for standard bars is very small, making it unsuitable for mass production. Therefore, the production cost and difficulty of this model are relatively high.
[0006] In order to solve the above problems, people have been seeking an ideal technological solution. Utility Model Content
[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a composite hardness standard bar that can achieve various hardness values by utilizing the matching relationships of composite structures.
[0008] To achieve the above objectives, the technical solution adopted by this utility model is: a composite hardness standard bar, comprising a nested inner liner and an outer sleeve.
[0009] The inner liner is made of a rigid material or an elastic material;
[0010] The outer sleeve is made of an elastic material;
[0011] The inner liner and the outer tube are detachably assembled together.
[0012] Based on the above, the material of the inner liner is quartz glass, cermet, or stainless steel.
[0013] Based on the above, the material of the inner liner is a rigid plastic elastic tube.
[0014] Based on the above, the material of the inner liner is an elastic material with an internally implanted spring.
[0015] Based on the above, the inner liner is a group of parts, and the spring materials in different inner liners of the same group have different diameters.
[0016] Based on the above, the inner liner has a structure comprising at least two layers of elastic tubes, each layer of elastic tubes being made of a different material.
[0017] Based on the above, the outer sleeve is made of silicone rubber or polyurethane foam.
[0018] Based on the above, it also includes an end and a handle, the handle and the end are connected by a connecting rod, the inner liner is fitted into the connecting rod area, and the outer sleeve is fitted onto the inner liner.
[0019] Based on the above, the connecting rod and the handle are integrally formed, and the connecting rod and the end are locked together by a thread.
[0020] Based on the above, the overall length of the hardness standard bar of the composite structure is between 70mm and 120mm.
[0021] This utility model has substantial features and progress compared to the prior art. Specifically, this utility model has the following advantages:
[0022] The standard rod is designed as a combination of an inner liner and an outer tube. The outer tube essentially simulates cigarette paper and is easy to use with thin, elastic materials. The inner liner simulates tobacco filling material. By filling with hard or elastic materials, a linear gradient change in the hardness value presented by the outer tube can be achieved. Compared with traditional solutions, it is more flexible and can achieve a relatively wider range of hardness display through fewer material combinations.
[0023] To facilitate installation, end caps and handles are provided. The inner liner and outer sleeve are installed based on the basic structure of the end caps and handles, which is more conducive to assembly, especially the combination of elastic materials. Attached Figure Description
[0024] Figure 1 This is a cross-sectional view of the hardness standard bar of the composite structure in this utility model.
[0025] Figure 2 This is a cross-sectional view of the hardness standard bar of the composite structure in this utility model.
[0026] Figure 3 This is a cross-sectional view of the hardness standard bar of the composite structure in other embodiments of this utility model.
[0027] In the diagram: 1. Inner liner; 2. Outer tube; 3. End; 4. Handle; 5. Connecting rod; 11. First elastic tube; 12. Second elastic tube. Detailed Implementation
[0028] The technical solution of this utility model will be further described in detail below through specific embodiments.
[0029] like Figure 1 and Figure 2 As shown, a composite hardness standard bar includes a nested inner liner 1 and an outer tube 2.
[0030] In this embodiment, for ease of installation, an end 3 and a handle 4 are added. The handle 4 and the end 3 are connected by a connecting rod 5. The inner liner 1 is fitted into the area of the connecting rod 5, and the outer sleeve 2 is fitted over the inner liner 1.
[0031] It should be noted that in other embodiments, even without the end cap and handle, the same purpose can be achieved by including only the inner liner 1 and the outer sleeve 2.
[0032] The inner liner 1 and the outer sleeve 2 are detachably assembled together for replacement.
[0033] In this embodiment, for ease of explanation, the inner liner 1 has a structure comprising at least two layers of elastic tubes, each made of a different material. As shown in the figure, there is a first elastic tube 11 and a second elastic tube 12. The first elastic tube 11 has a higher hardness than the second elastic tube 12. The two elastic tubes have different material combinations and thicknesses, which can provide different elastic values. Under this structure, the hardness value can be better transmitted.
[0034] In other embodiments, such as Figure 3 As shown, the core technical solution of this embodiment lies in the combination of different materials between the inner liner 1 and the outer sleeve 2. The inner liner 1 can be configured to have more than two layers.
[0035] Specifically, the inner liner 1 is made of a combination of rigid or elastic materials in different layers. When a rigid material is used, quartz glass, metal ceramics, or stainless steel can be selected. In this scheme, different hardness can be achieved by changing the material of the outer tube 2 or by changing the thickness of the outer tube 2.
[0036] The outer tube 2 is made of an elastic material. Since the outer tube 2 needs to "transmit" the properties of the inner liner 1, the thickness of the outer tube 2 should not be too thick, and can usually be less than 2mm. In this embodiment, the material of the outer tube can be silicone rubber or polyurethane foam.
[0037] In other embodiments, the liner is made of rigid plastic elastic tubing.
[0038] In other embodiments, the inner liner is made of an elastic material with an internally embedded spring, and the inner liner is a group of parts, with different diameters of spring materials in different inner liners within the same group.
[0039] In this embodiment, a set of inner liners of different specifications can be prepared using springs of different specifications. By replacing the inner liners of different specifications, different hardnesses can be achieved.
[0040] For ease of application, the overall length of the hardness standard bar of the composite structure is between 70mm and 120mm, similar to the length of a traditional cigarette.
[0041] Technical principle:
[0042] Hardness testing essentially uses the relationship between pressure and deformation to reflect hardness. Based on this relationship, different hardness data can be achieved by changing the material combination of the inner liner and the outer sleeve, or even the hardness of the materials of the inner liner and the outer sleeve.
[0043] The advantage of this approach is that it abandons the complex traditional method of using multiple materials to make standard bars with different hardness levels. Instead, it uses a limited selection of materials to combine and form standard bars with different hardness indices. This combination provides flexibility and reduces the difficulty of manufacturing hardness standard bars.
[0044] Meanwhile, because the structure of this scheme is more in line with the actual structure of cigarettes, by setting hardness gradients of multiple layers of materials, it is easier to design a standard rod that is close to the hardness value of cigarettes themselves when conducting simulations.
[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.
Claims
1. A hardness standard bar of a composite structure, characterized by: Includes nested, assembled inner liner and outer tube; The liner is made of a rigid material or an elastic material; The outer sleeve is made of an elastic material; The inner liner and the outer tube are detachably assembled together.
2. The composite hardness standard bar according to claim 1, characterized in that: The material of the inner liner is quartz glass, cermet, or stainless steel.
3. The hardness standard bar of composite construction according to claim 1, characterized in that: The inner lining is made of rigid plastic elastic tubing.
4. The hardness standard bar of composite structure according to claim 1, characterized in that: The liner is made of an elastic material with an internally implanted spring.
5. The hardness standard bar of composite construction according to claim 4, characterized in that: The inner liner is a group of parts, and the spring materials in different inner liners of the same group have different diameters.
6. The hardness standard bar with a composite structure according to claim 1, characterized in that: The inner liner is a structure containing at least two layers of elastic tubes, each made of a different material.
7. The hardness standard bar of composite structure according to any one of claims 1 to 6, characterized in that: The outer sleeve is made of silicone rubber or polyurethane foam.
8. The hardness standard bar of composite structure according to any one of claims 1-6, characterized in that: It also includes an end cap and a handle, which are connected by a connecting rod. The inner liner is fitted into the connecting rod area, and the outer sleeve is fitted onto the inner liner.
9. The hardness standard bar with a composite structure according to claim 8, characterized in that: The connecting rod and the handle are integrally formed, and the connecting rod and the end are locked together by a thread.
10. The hardness standard bar of composite construction according to any one of claims 1-6, characterized in that: The overall length of the hardness standard bar of the composite structure is between 70mm and 120mm.