A nonmagnetic liner structure for magnetic micro-area coding in hydraulic cylinders

Abstract

This application proposes a non-magnetic liner structure for magnetic micro-area coding in hydraulic cylinders, disposed between the inner wall of the hydraulic cylinder barrel and the working cavity of the hydraulic cylinder. The non-magnetic liner structure comprises: a non-magnetic liner body made of a non-ferromagnetic material, in a cylindrical shape, with its outer wall fixedly connected to the inner wall of the hydraulic cylinder barrel; and multiple magnetic micro-area units, spaced axially along the inner surface or interior of the non-magnetic liner body. Each magnetic micro-area unit differs in axial position, magnetization direction, and / or magnetic intensity level to form a magnetic micro-area coding band. The technical solution proposed in this application, by providing a non-magnetic liner layer on the inner wall of the hydraulic cylinder barrel and arranging the magnetic micro-area coding within the liner structure, weakens the influence of the cylinder barrel body on the magnetic field, thereby improving the stability and consistency of magnetic area coding recognition.

Description

Technical Field

[0001] This application relates to the field of structural design and manufacturing technology of underground hydraulic equipment in coal mines, and in particular to a non-magnetic liner structure for magnetic micro-area coding of hydraulic cylinders. Background Technology

[0002] Hydraulic supports, as the core support equipment in fully mechanized coal mining faces, rely on the precise and reliable sensing of their hydraulic cylinder strokes as a key technological foundation for achieving intelligent roof control and face automation. With the development of intelligent coal mining technology, stroke sensing schemes based on magnetic coding are widely used in related technologies due to their non-contact and high reliability characteristics.

[0003] In existing magnetically encoded stroke sensing schemes, magnetic micro-encoding units are typically placed on or near the inner wall of the hydraulic cylinder barrel. An external magnetic sensor reads the encoded signal to achieve accurate piston position detection. However, conventional hydraulic cylinder barrels are often made of high-strength ferromagnetic materials such as alloy steel to meet the stress requirements under high-pressure downhole conditions. But the inherent high permeability of ferromagnetic materials significantly shields and distorts the magnetic field generated by the magnetic micro-encoding units, directly affecting the stability and consistency of the magnetic sensor's reading signal and reducing the accuracy of stroke sensing.

[0004] To address the aforementioned issues, some technologies have attempted to solve them by directly machining or embedding magnetic structures on the inner wall of the cylinder. However, practice has shown that these solutions still have the following technical drawbacks: First, the machining accuracy of the magnetic micro-area is limited by the complex machining process of the cylinder inner wall. The inner wall of a hydraulic cylinder typically requires precision machining such as honing to meet sealing requirements, but directly machining a fine magnetic coding structure on its surface is difficult, making it hard to achieve high-precision micro-area coding. Second, there are magnetic coupling and stress concentration issues between the magnetic material and the cylinder substrate. Due to the magnetic interaction between the ferromagnetic cylinder and the magnetic coding unit, the coding signal will be distorted; at the same time, under the harsh conditions of high pressure, vibration, and media erosion in underground mines, stress concentration is prone to occur at the interface between the magnetic structure and the cylinder, leading to performance degradation or physical damage to the magnetic structure. Third, the complex underground working conditions pose a severe challenge to the durability of the magnetic structure. The underground coal mine environment contains factors such as high-pressure liquid erosion and hard particle abrasion, making the magnetic structure directly exposed to the inner wall of the cylinder prone to wear, detachment, or corrosion, affecting the long-term stability of the magnetic coding system. Fourth, subsequent maintenance and replacement are difficult. Once the magnetic coding structure is damaged, because it is directly installed on the inner wall of the cylinder, the entire hydraulic cylinder often needs to be disassembled for repair. This results in high maintenance costs and long cycles, hindering the widespread application of magnetic coding stroke sensing technology in underground coal mines. Therefore, there is an urgent need to propose a method to provide a stable and reliable installation and load-bearing foundation for magnetic micro-area coding without changing the main force-bearing structure of the hydraulic cylinder. Summary of the Invention

[0005] This application provides a non-magnetic inner liner structure for magnetic micro-area coding of hydraulic cylinders, which at least solves the technical problems of existing hydraulic cylinders where the magnetic field of the magnetic coding unit is shielded and distorted due to the use of ferromagnetic materials in the cylinder barrel, resulting in low coding accuracy, poor long-term stability, and difficult maintenance.

[0006] The first aspect of this application proposes a non-magnetic liner structure for magnetic micro-area encoding of a hydraulic cylinder, disposed between the inner wall of the hydraulic cylinder barrel and the working chamber of the hydraulic cylinder, characterized in that the non-magnetic liner structure comprises:

[0007] The non-magnetic inner liner body is made of non-ferromagnetic material and has a cylindrical structure. Its outer wall is fixedly connected to the inner wall of the hydraulic cylinder barrel. Multiple magnetic micro-region units are spaced apart along the axial direction of the non-magnetic liner body on the inner surface or inside of the non-magnetic liner body. Each magnetic micro-region unit differs in axial position, magnetization direction and / or magnetic intensity level to form a magnetic micro-region coding band.

[0008] Preferably, the non-magnetic inner liner body is an integral cylindrical structure extending along the axial direction of the hydraulic cylinder; Alternatively, the non-magnetic inner lining body is composed of multiple inner lining units spliced ​​together along the axial direction, and adjacent inner lining units are interconnected by splicing structures.

[0009] Furthermore, the splicing structure is one or more of the following: mortise and tenon structure, overlapping steps, or zero positioning pin holes.

[0010] Furthermore, the non-magnetic inner liner body is fixedly connected to the inner wall of the hydraulic cylinder barrel through an interference fit, an adhesive layer, or a mechanical snap-fit ​​structure.

[0011] Furthermore, the mechanical snap-fit ​​structure includes: An annular flange or buckle is provided on the outer wall of the non-magnetic inner liner body, and an annular groove or slot is provided on the inner wall of the hydraulic cylinder barrel, wherein the annular flange or buckle is embedded in the annular groove or slot.

[0012] Preferably, the non-magnetic inner liner body is made of polymer composite material, ceramic matrix composite material or austenitic stainless steel material.

[0013] Preferably, the magnetic micro-area unit is embedded in the groove or hole on the inner surface of the non-magnetic liner body and fixed by an adhesive. Alternatively, the magnetic micro-region unit may be completely encapsulated within the material of the non-magnetic inner liner body in a covering manner; Alternatively, the magnetic micro-region unit and the non-magnetic inner liner body are integrally formed by composite molding.

[0014] Preferably, the inner surface of the non-magnetic liner body is provided with a wear-resistant coating.

[0015] Furthermore, the wear-resistant coating is a polyurethane coating, a modified epoxy resin coating, or a ceramic particle reinforced coating.

[0016] Preferably, the thickness of the non-magnetic inner liner body remains consistent along the axial direction, or can be locally adjusted according to the stress conditions.

[0017] The technical solutions provided by the embodiments of this application have at least the following beneficial effects: This application proposes a non-magnetic liner structure for magnetic micro-area coding in hydraulic cylinders, disposed between the inner wall of the hydraulic cylinder barrel and the working cavity of the hydraulic cylinder. The non-magnetic liner structure comprises: a non-magnetic liner body made of a non-ferromagnetic material, in a cylindrical shape, with its outer wall fixedly connected to the inner wall of the hydraulic cylinder barrel; and multiple magnetic micro-area units, spaced axially along the inner surface or interior of the non-magnetic liner body. Each magnetic micro-area unit differs in axial position, magnetization direction, and / or magnetic intensity level to form a magnetic micro-area coding band. The technical solution proposed in this application, by providing a non-magnetic liner layer on the inner wall of the hydraulic cylinder barrel and arranging the magnetic micro-area coding within the liner structure, weakens the influence of the cylinder barrel body on the magnetic field, thereby improving the stability and consistency of magnetic area coding recognition.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a structural block diagram of a non-magnetic liner structure for magnetic micro-area coding of a hydraulic cylinder according to an embodiment of this application; Figure 2 This is a connection structure diagram of a non-magnetic liner body provided according to an embodiment of this application; Figure 3 This is a schematic diagram showing the connection relationship between the non-magnetic inner liner body and the inner wall of the hydraulic cylinder barrel according to an embodiment of this application; Figure Labels 1. Non-magnetic inner liner body, 2. Magnetic micro-region unit, 1-1 inner liner unit, 3. Splicing structure, 4. Mechanical snap-fit ​​structure. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0021] This application proposes a non-magnetic liner structure for magnetic micro-area coding in hydraulic cylinders, disposed between the inner wall of the hydraulic cylinder barrel and the working cavity of the hydraulic cylinder. The non-magnetic liner structure comprises: a non-magnetic liner body made of a non-ferromagnetic material, in a cylindrical structure, with its outer wall fixedly connected to the inner wall of the hydraulic cylinder barrel; and multiple magnetic micro-area units, spaced axially along the inner surface or interior of the non-magnetic liner body. Each magnetic micro-area unit differs in axial position, magnetization direction, and / or magnetic intensity level to form a magnetic micro-area coding band. The technical solution proposed in this application, by providing a non-magnetic liner layer on the inner wall of the hydraulic cylinder barrel and arranging the magnetic micro-area coding within the liner structure, weakens the influence of the cylinder barrel body on the magnetic field, thereby improving the stability and consistency of magnetic area coding recognition.

[0022] The following description, with reference to the accompanying drawings, describes an embodiment of a non-magnetic liner structure for magnetic micro-area coding of a hydraulic cylinder.

[0023] Example 1 Figure 1 This is a structural diagram of a non-magnetic liner structure for magnetic micro-area coding of a hydraulic cylinder according to an embodiment of this application, as shown below. Figure 1 As shown, the non-magnetic liner structure, disposed between the inner wall of the hydraulic cylinder barrel and the working chamber of the hydraulic cylinder, includes: The non-magnetic inner liner body 1 is made of non-ferromagnetic material and has a cylindrical structure. Its outer wall is fixedly connected to the inner wall of the hydraulic cylinder barrel. Multiple magnetic micro-region units 2 are spaced apart along the axial direction of the non-magnetic liner body 1 on the inner surface or inside of the non-magnetic liner body 1. Each magnetic micro-region unit differs in axial position, magnetization direction and / or magnetic intensity level to form a magnetic micro-region coding band.

[0024] In this embodiment of the disclosure, the non-magnetic inner liner body 1 is an integral cylindrical structure extending along the axial direction of the hydraulic cylinder; Or, such as Figure 2 As shown, the non-magnetic inner lining body 1 is composed of multiple inner lining units 1-1 spliced ​​together along the axial direction, and adjacent inner lining units 1-1 are connected to each other through splicing structure 3.

[0025] It should be noted that the splicing structure 3 is one or more of the following: mortise and tenon structure, overlapping steps, or 0 positioning pin holes.

[0026] In the embodiments disclosed herein, such as Figure 3 As shown, the non-magnetic inner liner body 1 is fixedly connected to the inner wall of the hydraulic cylinder barrel by an interference fit, an adhesive layer, or a mechanical snap-fit ​​structure 4.

[0027] Furthermore, the mechanical snap-fit ​​structure 4 includes: An annular flange or buckle is provided on the outer wall of the non-magnetic inner liner body, and an annular groove or slot is provided on the inner wall of the hydraulic cylinder barrel, wherein the annular flange or buckle is embedded in the annular groove or slot.

[0028] It should be noted that the non-magnetic inner lining body 1 is made of polymer composite material, ceramic matrix composite material or austenitic stainless steel material.

[0029] In this embodiment of the disclosure, the magnetic micro-area unit 2 is embedded in the groove or hole on the inner surface of the non-magnetic inner liner body 1 and fixed by an adhesive. Alternatively, the magnetic micro-region unit 2 may be completely encapsulated within the material of the non-magnetic inner liner body 1 in a covering manner; Alternatively, the materials of the magnetic micro-region unit 2 and the non-magnetic inner liner body 1 may be integrally formed by composite molding.

[0030] Furthermore, the inner surface of the non-magnetic inner liner body 1 is provided with a wear-resistant coating.

[0031] It should be noted that the wear-resistant coating is a polyurethane coating, a modified epoxy resin coating, or a ceramic particle reinforced coating.

[0032] Furthermore, the thickness of the non-magnetic inner liner body 1 remains consistent along the axial direction, or can be locally adjusted according to the stress conditions.

[0033] The non-magnetic liner structure for magnetic micro-area coding in hydraulic cylinders proposed in this embodiment has the following advantages: 1. By using a non-magnetic inner lining structure, the shielding and distortion effects of the hydraulic cylinder barrel material on the magnetic encoding magnetic field are effectively reduced; 2. Provides a stable and controllable installation foundation for magnetic micro-area coding, improving coding consistency; 3. It does not change the main force-bearing structure of the hydraulic cylinder, making engineering implementation easier; 4. Suitable for complex working conditions such as high pressure, vibration and wear in underground coal mines; 5. Facilitates the manufacturing, assembly, and maintenance of magnetic coding structures.

[0034] In summary, the non-magnetic liner structure for magnetic micro-area coding of hydraulic cylinders proposed in this embodiment reduces the influence of the cylinder body on the magnetic field and improves the stability and consistency of magnetic area coding recognition by setting a non-magnetic liner layer on the inner wall of the hydraulic cylinder barrel and arranging the magnetic micro-area coding in the liner structure.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0036] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0037] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A non-magnetic liner structure for magnetic micro-area encoding in a hydraulic cylinder, disposed between the inner wall of the hydraulic cylinder barrel and the working chamber of the hydraulic cylinder, characterized in that, The non-magnetic liner structure includes: The non-magnetic inner liner body is made of non-ferromagnetic material and has a cylindrical structure. Its outer wall is fixedly connected to the inner wall of the hydraulic cylinder barrel. Multiple magnetic micro-region units are spaced apart along the axial direction of the non-magnetic liner body on the inner surface or inside of the non-magnetic liner body. Each magnetic micro-region unit differs in axial position, magnetization direction and / or magnetic intensity level to form a magnetic micro-region coding band.

2. The non-magnetic liner structure as described in claim 1, characterized in that, The non-magnetic inner liner body is an integral cylindrical structure extending along the axial direction of the hydraulic cylinder; Alternatively, the non-magnetic inner lining body is composed of multiple inner lining units spliced ​​together along the axial direction, and adjacent inner lining units are interconnected by splicing structures.

3. The non-magnetic liner structure as described in claim 2, characterized in that, The splicing structure is one or more of the following: mortise and tenon structure, overlapping steps, or zero positioning pin holes.

4. The non-magnetic liner structure as described in claim 2, characterized in that, The non-magnetic inner liner body is fixedly connected to the inner wall of the hydraulic cylinder barrel through an interference fit, adhesive layer, or mechanical snap-fit ​​structure.

5. The non-magnetic liner structure as described in claim 4, characterized in that, The mechanical snap-fit ​​structure includes: An annular flange or buckle is provided on the outer wall of the non-magnetic inner liner body, and an annular groove or slot is provided on the inner wall of the hydraulic cylinder barrel, wherein the annular flange or buckle is embedded in the annular groove or slot.

6. The non-magnetic liner structure as described in claim 1, characterized in that, The non-magnetic inner lining body is made of polymer composite material, ceramic matrix composite material or austenitic stainless steel material.

7. The non-magnetic liner structure as described in claim 1, characterized in that, The magnetic micro-area unit is embedded in the groove or hole on the inner surface of the non-magnetic liner body and fixed by an adhesive. Alternatively, the magnetic micro-region unit may be completely encapsulated within the material of the non-magnetic inner liner body in a covering manner; Alternatively, the magnetic micro-region unit and the non-magnetic inner liner body are integrally formed by composite molding.

8. The non-magnetic liner structure as described in claim 1, characterized in that, The inner surface of the non-magnetic liner body is provided with a wear-resistant coating.

9. The non-magnetic liner structure as described in claim 8, characterized in that, The wear-resistant coating is a polyurethane coating, a modified epoxy resin coating, or a ceramic particle reinforced coating.

10. The non-magnetic liner structure as described in claim 1, characterized in that, The thickness of the non-magnetic inner lining body remains consistent along the axial direction, or can be locally adjusted according to the stress conditions.

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