Design method of piston rod, piston rod and hydraulic support

Abstract

The present application relates to the technical field of hydraulic support, and particularly relates to a piston rod design method, a piston rod and a hydraulic support. The piston rod design method comprises the following steps: determining parameters of the piston rod; constructing an outer contour geometric model of the piston rod according to the parameters of the piston rod, dividing an outer contour grid to form an outer contour finite element model; constructing an internal skeleton model of the piston rod according to the parameters of the piston rod; reconstructing the outer contour model and the internal skeleton model of the piston rod to form a piston rod model; and outputting the piston rod model after finite element analysis and checking of the piston rod model. The piston rod design method can improve the performance of the piston rod.

Description

Technical Field

[0001] This invention relates to the field of hydraulic support technology, specifically to a piston rod design method, a piston rod, and a hydraulic support. Background Technology

[0002] As a crucial power component of the hydraulic support moving device, the pushing jack pushes the scraper conveyor against the coal face and moves the hydraulic support forward, thus completing the "pushing the conveyor" and "moving the support" actions. The piston rod, a key component of the pushing jack, is primarily subjected to axial tension during the "pushing the conveyor" action and axial pressure during the "moving the support" action. In related technologies, the piston rod in the pushing jack is often made of either a solid or hollow material. However, solid piston rods have a larger structural dimension, resulting in greater weight and increased transportation difficulty. Hollow piston rods have a longer stroke, are prone to insufficient strength, and reduce the stability of the piston rod.

[0003] In summary, the performance of the piston rod in the relevant technology still needs to be improved. Summary of the Invention

[0004] This invention aims to at least partially address one of the technical problems in related technologies. To this end, embodiments of this invention propose a piston rod design method that can improve piston rod performance.

[0005] This invention also proposes a piston rod.

[0006] This invention also proposes a hydraulic support.

[0007] The piston rod design method of this invention includes the following steps: determining the parameters of the piston rod; constructing the outer contour geometric model of the piston rod according to the parameters of the piston rod, and dividing the outer contour mesh to form an outer contour finite element model; constructing the internal skeleton model of the piston rod according to the parameters of the piston rod; reconstructing the outer contour model and the internal skeleton model of the piston rod to form a piston rod model; and outputting the piston rod model after performing finite element analysis to verify the piston rod model.

[0008] The piston rod design method of this invention can improve the performance of the piston rod.

[0009] In some embodiments, constructing the internal skeleton model of the piston rod based on its parameters includes: randomly selecting points on the inner surface of the outer contour of the piston rod, denoted as a first point group; randomly selecting points on the inner surface of the piston rod and its two ends, denoted as a second point group and a third point group; assigning a first probability to points selected between different point groups, and assigning a second probability to points selected within the same point group, wherein the first probability is greater than the second probability; and randomly selecting two points based on the probability assignments to construct a model of a metal beam.

[0010] In some embodiments, randomly selecting two points based on probability assignment to construct a metal beam includes: determining whether the distance between the two randomly selected points meets a preset distance; if so, constructing a model of the metal beam; otherwise, reselecting points; determining whether the total volume of the constructed multiple metal beams meets a preset volume; if so, completing the construction of the metal beam model; otherwise, reselecting points.

[0011] In some embodiments, determining whether the distance between two randomly selected points meets the preset distance includes: setting the distance between the two randomly selected points to be L; setting the maximum length of the metal beam to be Lmax and the minimum length of the metal beam to be Lmin; if Lmin≤L≤Lmax, then determining that the distance between the two randomly selected points meets the preset distance.

[0012] In some embodiments, the probability of the metal beam extending along a first direction is greater than the probability of the metal beam extending along a second direction, and the first direction and the second direction are arranged orthogonally.

[0013] In some embodiments, outputting the piston rod model after performing finite element analysis verification includes: applying loads and adding constraints to the piston rod model, performing finite element analysis; determining whether the analysis results meet preset requirements; if yes, outputting the piston rod model; otherwise, re-determining the parameters of the piston rod.

[0014] In some embodiments, dividing the outer contour mesh to form the outer contour finite element model includes: randomly selecting hard points on the inner surface of the outer contour of the piston rod, and dividing the outer contour mesh according to the selected element type.

[0015] In some embodiments, determining the parameters of the piston rod includes: determining the parameters of the outer contour of the piston rod; and determining the parameters of the internal skeleton of the piston rod.

[0016] The piston rod of this invention includes the piston rod manufactured by the design method described in any of the preceding claims.

[0017] The piston rod of this invention can reduce its weight and improve its performance.

[0018] The hydraulic support of this invention includes the piston rod described above.

[0019] The hydraulic support of this invention can improve the performance of the hydraulic support. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the bone structure in existing technology.

[0021] Figure 2 This is a schematic flowchart of the piston rod design method according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the process of constructing a metal beam according to an embodiment of the present invention.

[0023] Figure 4 This is a flowchart illustrating the finite element analysis model of an embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of a piston rod model according to an embodiment of the present invention.

[0025] Figure 6 This is a schematic diagram of the outer contour model of an embodiment of the present invention.

[0026] Figure 7 This is a schematic diagram of the internal skeleton model of an embodiment of the present invention.

[0027] Figure labels: Bone 100, Compact bone 110, Cancellous bone 120, Trabeculae 1210.

[0028] Outer contour model 1, internal skeleton model 2, metal beam 21, cavity 22, piston rod model 3. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0030] like Figures 1-7 As shown, the piston rod design method of this invention includes the following steps: determining the parameters of the piston rod; constructing the outer contour geometric model of the piston rod according to the parameters of the piston rod, and dividing the outer contour mesh to form the outer contour finite element model; constructing the internal skeleton model 2 of the piston rod according to the parameters of the piston rod; reconstructing the outer contour model 1 and the internal skeleton model 2 of the piston rod to form the piston rod model 3; and outputting the piston rod model 3 after performing finite element analysis to verify the piston rod model 3.

[0031] Specifically, in this embodiment of the invention, the parameters of the piston rod are determined according to the actual usage requirements of the piston rod, and an outer contour model 1 of the piston rod is constructed based on the determined outer contour parameters. An internal skeleton model 2 is constructed based on the internal skeleton parameters, and the constructed outer contour model 1 and internal skeleton model 2 are reconstructed to form a piston rod model 3.

[0032] Optionally, by constructing the outer contour model 1 and the inner skeleton model 2 of the piston rod respectively, and then merging the overlapping points of the successfully constructed outer contour model 1 and the inner skeleton model 2 for reconstruction, the error of the piston rod model 3 can be reduced, thereby improving the performance of the piston rod model 3.

[0033] Understandably, by performing finite element analysis on the constructed piston rod type, the performance of the piston rod can be verified, and a piston rod model 3 that passes the verification can be output. By analyzing and verifying the performance of piston rod model 3, the performance of the piston rod manufactured based on piston rod model 3 can be improved.

[0034] In some embodiments, constructing the internal skeleton model 2 of the piston rod based on the parameters of the piston rod includes: randomly selecting points on the inner surface of the outer contour of the piston rod, denoted as a first point group; randomly selecting points on the inner surface of the piston rod and at both ends, denoted as a second point group and a third point group; assigning a first probability to points selected between different point groups, assigning a second probability to points selected within the same point group, wherein the first probability is greater than the second probability; and randomly selecting two points based on the probability assignments to construct a model of the metal beam 21.

[0035] Specifically, when constructing the internal skeleton model 2 of the piston rod using predetermined piston rod parameters, different point groups are recorded by randomly selecting points on the inner surface, interior, and inner surfaces of both ends of the piston rod's outer contour. By assigning different probabilities to points within and between different point groups, two endpoints of the metal beam 21 are randomly selected. Then, the metal beam 21 model is constructed using the two randomly selected endpoints. The construction of multiple metal beam 21 models forms the internal skeleton model 2.

[0036] It is understandable that multiple metal beams 21 are interwoven and segmented to form multiple interconnected porous cavities 22, that is, the internal skeleton model 2 presents a mesh-like porous structure, such as... Figure 1 As shown, in this embodiment of the invention, the internal skeleton model 2 of the piston rod is constructed to mimic the structure of human bone 100, making the internal skeleton model 2 similar to the structure of cancellous bone 120. Cancellous bone 120 is mainly composed of a large number of interwoven trabeculae 1210, exhibiting a spongy appearance. The overall arrangement direction of the trabeculae 1210 is basically consistent with the direction of force on the bone, but their length and position have considerable randomness. In this embodiment, the endpoints of metal beams 21 are randomly selected to construct a metal beam 21 model, and the interweaving of multiple metal beams 21 forms the internal skeleton model 2, thereby improving the performance of the piston rod.

[0037] It is understandable that since the piston rod is mainly subjected to axial force, most of the metal beams 21 should also be axial. By assigning different probabilities to points within a point group and between different point groups, most of the metal beams 21 can be set to be axial. For example, the first probability is 90% and the second probability is 10%. That is, with a 90% probability, two random points between different point groups are selected as the endpoints of the metal beams 21, and with a 10% probability, two random points between the same point group are selected as the endpoints of the metal beams 21 to construct the metal beam 21 model.

[0038] like Figure 3 As shown, the process of randomly selecting two points based on probability assignment to construct a metal beam 21 includes: determining whether the distance between the two randomly selected points meets the preset distance; if so, constructing the model of the metal beam 21; otherwise, reselecting points; determining whether the total volume of the constructed multiple metal beams 21 meets the preset volume; if so, completing the construction of the metal beam 21 model; otherwise, reselecting points.

[0039] Specifically, the distance between the two ends of the pre-determined metal beam 21 is compared with the distance between two randomly selected points to ensure that the length of the constructed metal beam 21 model is within this range, avoiding the situation where the length of the metal beam 21 is too long or too short. The metal beam 21 model is established according to the pre-determined diameter of the metal beam 21, thereby improving the structural performance of the metal beam 21.

[0040] Optionally, the total volume of the metal beams 21 in the internal skeleton model 2 is compared with the total volume of the multiple metal beams 21 that have been constructed, to ensure that for each additional metal beam 21, the sum of the total volume of the previously constructed metal beams 21 and the volume of the newly constructed metal beam 21 is less than or equal to the preset volume, thereby ensuring that the total volume of the multiple metal beams 21 is within the preset volume, ensuring the mesh porous structure of the internal skeleton, and thus improving the performance of the internal skeleton model 2.

[0041] For example, the preset volume ratio is 10%.

[0042] In some embodiments, determining whether the distance between two randomly selected points meets the preset distance includes: setting the distance between the two randomly selected points to be L; setting the maximum length of the metal beam 21 to be Lmax and the minimum length of the metal beam 21 to be Lmin; if Lmin≤L≤Lmax, then it is determined that the distance between the two randomly selected points meets the preset distance.

[0043] Specifically, by determining the maximum and minimum lengths of the metal beam 21, the situation of the metal beam 21 being too long or too short can be avoided. The maximum and minimum lengths of the metal beam 21 can be determined based on the actual usage environment of the piston rod, and also need to be determined based on the processing capabilities of the 3D printing equipment.

[0044] For example, the preset spacing is the maximum and minimum length of the metal beam, the maximum length Lmax of the metal beam 21 is 20mm, and the minimum length Lmin of the metal beam 21 is 1mm.

[0045] In some embodiments, the metal beam 21 is along a first direction (e.g. Figure 7 The probability of the metal beam 21 extending in the vertical direction (as shown) is greater than that along the second direction (as shown). Figure 7 The probability of extending in the left and right directions (as shown) is given, and the first direction and the second direction are arranged orthogonally.

[0046] Specifically, the piston rod model 3 is a bone-mimicking design. The overall arrangement direction of the trabeculae 1210 in the cancellous bone 120 is basically consistent with the direction of bone stress, that is, it presents an axial distribution. However, the length and position have considerable randomness. In this embodiment, a random point selection method is adopted to satisfy the randomness of the length and position of the metal beam 21. By making the probability of the metal beam 21 distributed in the vertical direction greater than the probability of the metal beam 21 distributed in the horizontal direction, the design of the internal skeleton model 2 as a bone-mimicking cancellous bone 120 is realized, thereby improving the performance of the piston rod.

[0047] like Figure 4 As shown, the process of outputting piston rod model 3 after finite element analysis verification includes: applying loads and adding constraints to piston rod model 3, performing finite element analysis; determining whether the analysis results meet the preset requirements; if so, outputting piston rod model 3; otherwise, re-determining the parameters of the piston rod.

[0048] Specifically, a finite element model of the piston rod is established and finite element analysis is performed to judge the analysis results of the constructed piston rod model 3. If the analysis results of the piston rod model 3 meet the preset requirements, the piston rod model 3 is output.

[0049] For example, the preset requirements could be the strength and stability of the piston rod. That is, if the strength and stability of the piston rod model 3 meet the actual strength and stability requirements of the piston rod, then the piston rod model 3 is output, and the output piston rod model 3 is 3D printed to obtain a piston rod with a bone-like structure.

[0050] In some embodiments, dividing the outer contour mesh to form the outer contour finite element model includes: randomly selecting hard points on the inner surface of the outer contour of the piston rod, and dividing the outer contour mesh according to the selected element type.

[0051] Specifically, a geometric model of the piston rod's outer contour is constructed based on the piston rod parameters. At the same time, hard points are randomly selected on the inner surface of the geometric model of the piston rod's outer contour, and the outer contour layer mesh of the piston rod is divided using SOLID187 elements to form the outer contour model 1.

[0052] For example, 4000 hard points are randomly selected from the inner surface of the piston rod's outer contour.

[0053] It is understood that the outer contour model 1 of this embodiment is designed to resemble human bone 100. The outer contour model 1 is constructed to resemble bone compact 110. Bone compact 110 has a dense texture and strong resistance to compression and torsion. In this embodiment, the outer contour model 1 is constructed as a dense metal structure, that is, the outer contour layer of the piston rod is set as a dense metal structure to improve the performance of the constructed piston rod.

[0054] This invention relates to a piston rod model 3 designed to mimic bone structure. Specifically, the outer contour model 1 is designed to mimic bone compact material 110, and the outer contour model 1 is constructed as a dense metal structure. The inner skeleton model 2 is designed to mimic bone cancellous material 120, and is composed of metal beams 21 of different lengths and positions. In combination with the force direction of the piston rod, most of the metal beams 21 are distributed axially, and multiple metal beams 21 are arranged in an interlaced manner to form an internal mesh porous structure. The outer contour model 1 is then wrapped around the inner skeleton model 2 to form the piston rod model 3. Finite element analysis is performed on the performance of the piston rod model 3, and the piston rod model 3 that meets the strength and stability requirements is output. The piston rod manufactured using the output model has better performance.

[0055] In some embodiments, determining the parameters of the piston rod includes: determining the parameters of the outer contour of the piston rod; and determining the parameters of the internal skeleton of the piston rod.

[0056] Specifically, determining the outer contour parameters of the piston rod includes the rod length, inner diameter, outer diameter, and the number of randomly selected hard points on the inner surface of the outer contour layer. Determining the internal skeleton parameters of the piston rod includes the diameter and length of the metal beam 21, the number of randomly selected points in the internal skeleton model 2, and the volume percentage of the metal beam 21.

[0057] Understandably, the outer contour parameters of the piston rod need to be determined according to the actual usage requirements of the piston rod. For example, the piston rod length is set to 100mm, the inner diameter to 80mm, the outer diameter to 100mm, and the number of hard points on the inner surface of the outer contour layer to be 4000.

[0058] The internal skeleton parameters of the piston rod can be adjusted according to the processing capabilities of the 3D printing equipment. For example, the diameter of the metal beam 21 is 0.5mm, the number of random points inside the piston rod is 4000, and points are taken from the inner surfaces of both ends of the piston rod, with 1000 points each. The metal beam 21 accounts for 10% of the volume of the internal skeleton model 2.

[0059] The piston rod of this invention includes a piston rod manufactured by any of the design methods described above.

[0060] This invention improves the structural performance of the piston rod by designing it in a bone-like manner. Since bone 100 is lightweight, high-strength, and impact-resistant, this invention improves the structural performance of the piston rod by designing it in a bone-like manner and using 3D printing technology to turn the constructed piston rod model 3 into a solid.

[0061] Optionally, since the piston rod includes an outer contour model 1 and an internal skeleton model 2, the piston rod of this embodiment is lighter and easier to transport than the solid piston rod in the related art. Compared with the hollow piston rod in the related art, the stroke is large and it is prone to insufficient strength and poor stability. In this embodiment, by setting the piston rod to interlocking metal beams 21 inside, the design of multiple interlocking metal beams 21 can improve the strength and stability of the piston rod. The piston rod manufactured by the piston rod model 3 constructed by the outer contour model 1 and the internal skeleton model 2 in this embodiment can reduce the weight of the piston rod while ensuring the strength and stability of the piston rod, saving materials and ensuring performance.

[0062] The hydraulic support of this invention includes the piston rod described above.

[0063] The hydraulic support of this invention, by employing the aforementioned piston rod, can reduce the weight of the hydraulic support, which is beneficial for weight reduction, and also improves the strength and stability of the piston rod, thereby enhancing the performance of the hydraulic support.

[0064] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0068] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. 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.

[0069] It is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for designing a piston rod, characterized in that, Includes the following steps: Determine the parameters of the piston rod; Based on the parameters of the piston rod, construct the outer contour geometric model of the piston rod, and divide the outer contour mesh to form the outer contour finite element model; Construct an internal skeleton model of the piston rod based on its parameters; The outer contour model and internal skeleton model of the piston rod are reconstructed to form the piston rod model; The piston rod model is output after being verified by finite element analysis. Constructing the internal skeleton model of the piston rod based on its parameters includes: Randomly select points on the inner surface of the outer contour of the piston rod, and record them as the first point group; Randomly select points on the inside of the piston rod and the inner surfaces of both ends, and record them as the second point group and the third point group; A first probability is assigned to points selected from different point groups, and a second probability is assigned to points selected from the same point group, wherein the first probability is greater than the second probability; Two points are randomly selected based on probability assignment to construct a model of the metal beam.

2. The piston rod design method according to claim 1, characterized in that, Based on probability assignment, two points are randomly selected to construct the metal beam, including: Determine whether the distance between two randomly selected points meets the preset distance. If so, construct the model of the metal beam; otherwise, reselect the points. Determine whether the total volume of the constructed metal beams meets the preset volume. If so, complete the construction of the metal beam model; otherwise, reselect the points.

3. The piston rod design method according to claim 2, characterized in that, Determining whether the distance between two randomly selected points meets the preset distance includes: Let L be the distance between two randomly selected points; The maximum length of the metal beam is set to Lmax, and the minimum length of the metal beam is set to Lmin; If Lmin≤L≤Lmax, then the distance between the two randomly selected points is determined to meet the preset distance.

4. The piston rod design method according to claim 3, characterized in that, The probability that the metal beam extends along the first direction is greater than the probability that the metal beam extends along the second direction, and the first direction and the second direction are arranged orthogonally.

5. The piston rod design method according to claim 4, characterized in that, After performing finite element analysis to verify the piston rod model, the output of the piston rod model includes: Apply loads and constraints to the piston rod model and perform finite element analysis. Determine whether the analysis results meet the preset requirements; If so, output the piston rod model; otherwise, redetermine the piston rod parameters.

6. The piston rod design method according to claim 1, characterized in that, The process of dividing the outer contour into a finite element model includes: randomly selecting hard points on the inner surface of the outer contour of the piston rod, and dividing the outer contour into a mesh according to the selected element type.

7. The piston rod design method according to claim 1, characterized in that, Determining the parameters of the piston rod includes: Determine the parameters of the outer contour of the piston rod; Determine the internal skeleton parameters of the piston rod.

8. A piston rod, characterized in that, This includes piston rods manufactured using the design method described in any one of claims 1-7 above.

9. A hydraulic support, characterized in that, Includes the piston rod as described in claim 8.

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