Gantry beam with high rigidity ratio

Abstract

The utility model relates to a gantry crossbeam with high quality and rigidity ratio belongs to industrial machine tool automation equipment technical field, including crossbeam main part, the bottom plate middle part of crossbeam main part is equipped with the fish belly shape reinforcing structure, and the bottom plate both ends are through the arc transition surface and are transitioned to the crossbeam support surface of both ends, and further are equipped with V type weight reduction groove on the bottom plate, the crossbeam main part is equipped with material removal cavity inside, and is equipped with a plurality of thin wall reinforcing ribs in material removal cavity. Thus, under the premise of satisfying the bearing deformation requirement, the optimization of crossbeam overall quality is realized, effectively solve the problem that traditional crossbeam is difficult to give consideration to quality and rigidity, thereby the acceleration response ability, motion precision and energy efficiency of crossbeam are improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of industrial machine tool automation equipment, specifically relating to a high-quality gantry beam with a high rigidity ratio. Background Technology

[0002] Gantry cranes are the core load-bearing structures in industrial equipment such as dispensing, material handling, and precision machining. The gantry beam, as the mounting base for moving components, directly determines the equipment's operational accuracy and production efficiency through its dynamic performance (acceleration, rigidity, and deformation control). In the development of industrial automation, the precision requirements for operations such as dispensing and precision positioning in various equipment have gradually increased to the micrometer level, thus placing higher demands on the mass-to-rigidity ratio of the gantry beam.

[0003] In industrial settings with limited motor drive force, the mass-to-rigidity ratio of the gantry beam becomes a core indicator restricting equipment performance: excessive mass leads to insufficient acceleration, affecting production efficiency; insufficient rigidity causes deformation during movement, reducing positioning accuracy and ultimately increasing the defect rate. Therefore, optimizing the gantry beam structure to achieve a balance between mass and rigidity has become a key direction for improving the performance of industrial equipment.

[0004] Currently, the mainstream design scheme for gantry beam structures is the "integral square column with partial hollowing-out" type. This scheme uses a solid square column as the base material, and designers, based on experience, remove material from non-critical areas inside the beam, preserving mounting surfaces for components such as guide rails, linear motor stators, support structures, and grating rulers. The core idea of ​​this scheme is to reduce material usage through "subtractive design," but it lacks scientific analysis of the hollowed-out areas, leading to the following problems: excessive material removal in some critical load-bearing areas, while non-load-bearing areas still contain a large amount of redundant material; the internal structure of the beam is chaotic, lacking systematic reinforcement design, and exhibiting uneven overall rigidity distribution; and the bottom lacks a targeted load-bearing optimization structure, making it prone to bending deformation under longitudinal loads. Therefore, there is an urgent need to propose a gantry beam with a high-quality rigidity ratio. Utility Model Content

[0005] To address the aforementioned problems in the existing technology, this utility model provides a gantry beam with a high-quality rigidity ratio. The technical problem to be solved by this utility model is achieved through the following technical solution: This utility model provides a high-quality rigidity ratio gantry beam, comprising: a beam body having a top wall, a bottom plate, and two side walls connecting the top wall and the bottom plate; the beam body extending along a first direction, with beam support surfaces at both ends for connection to an external fixed support structure; a fish-belly-shaped reinforcing structure extending along the first direction and partially protruding along a second direction in the middle of the bottom plate; arc transition surfaces at both ends of the bottom plate along the first direction, smoothly transitioning to the beam support surfaces at the ends of the beam body; multiple V-shaped weight-reducing grooves also formed on the bottom plate; a material removal cavity inside the beam body, the projection contour of the material removal cavity along the third direction being an isosceles trapezoid; the material removal cavity being divided into multiple sub-removal cavities along the first direction by multiple thin-walled reinforcing ribs; an arc-shaped cut-out flared opening communicating with the material removal cavity in the middle of one side wall of the beam body; wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0006] In one embodiment of this utility model, the top wall of the main body of the crossbeam is provided with a guide rail mounting surface for mounting linear guide rails and a grating ruler mounting surface for mounting grating rulers; the side wall of one side of the main body of the crossbeam is provided with a stator mounting surface for mounting the stator of a linear motor.

[0007] In one embodiment of this utility model, at least one thin-walled reinforcing rib is provided in the area near the guide rail mounting surface and the grating ruler mounting surface, respectively.

[0008] In one embodiment of this utility model, the fish-belly-shaped reinforcing structure is connected to the side wall on one side of the main body of the crossbeam, and the bottom of the fish-belly-shaped reinforcing structure is set as an arc surface.

[0009] In one embodiment of the present invention, a plurality of V-shaped weight-reducing grooves are symmetrically distributed at both ends of the base plate along the first direction, and each V-shaped weight-reducing groove is away from the fish-belly-shaped reinforcing structure along the third direction.

[0010] In one embodiment of this utility model, the height of the material removal cavity near the middle region of the main body of the crossbeam is greater than the height of its two ends.

[0011] In one embodiment of this utility model, the upper side of the arc-shaped cut-out flared opening is located near the top wall of the crossbeam body, the lower side has an arc curvature, and the arc-shaped cut-out flared opening protrudes towards the second direction.

[0012] In one embodiment of the present invention, a plurality of first weight-reduction holes are provided on at least one side wall of the crossbeam body.

[0013] In one embodiment of this utility model, a plurality of second weight-reducing holes are provided through the fish-belly-shaped reinforcing structure.

[0014] In one embodiment of this utility model, the high-quality rigidity ratio gantry beam has an axisymmetric structure along the first direction.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention features a high-strength gantry beam with a high rigidity ratio. Through a fish-belly-shaped reinforcement structure located in the center of the base plate, the beam's resistance to longitudinal bending deformation is significantly improved. A smooth transition between the base plate and the beam support surfaces at both ends is achieved using an arc-shaped transition surface, optimizing the load transfer path from the beam body to both ends and reducing stress concentration. A V-shaped weight-reduction groove precisely removes material from non-high-stress areas on both sides of the fish-belly-shaped reinforcement structure, effectively reducing mass. The beam body also includes a material removal cavity, which removes material through its isosceles trapezoidal cross-section. Further weight-reduction space is expanded in the center through an arc-shaped cut-out. To ensure the machining accuracy and structural stability of critical mounting surfaces, thin-walled reinforcing ribs are installed in the material removal cavity for the areas containing these surfaces. This achieves mass optimization while maintaining structural rigidity, thereby improving the beam's acceleration response, motion accuracy, and energy efficiency.

[0016] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram (first view) of a high-quality rigidity ratio gantry beam provided in an embodiment of this utility model; Figure 2 This is a structural schematic diagram (second view) of the high-quality rigidity ratio gantry beam provided in this embodiment of the utility model; Figure 3 This is a structural schematic diagram (front view) of the high-quality rigidity ratio gantry beam provided in this embodiment of the utility model; Figure 4 This is a structural schematic diagram (rear view) of the high-quality rigidity ratio gantry beam provided in this embodiment of the utility model; Figure 5 This is a schematic diagram (top view) of the high-quality rigidity ratio gantry beam provided in this embodiment of the utility model.

[0018] Reference numerals: 1-Fish-belly shaped reinforcing structure; 2-Circular arc transition surface; 3-V-shaped weight reduction groove; 4-Material removal cavity; 5-Circular arc cut-out flare; 6-Thin-walled reinforcing rib; 7-First weight reduction hole; 8-Second weight reduction hole. Detailed Implementation

[0019] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following detailed description of a high-quality rigidity ratio gantry beam proposed according to this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0020] The foregoing and other technical contents, features, and effects of this utility model will be clearly presented in the following detailed description of the specific embodiments with reference to the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding can be gained of the technical means and effects adopted by this utility model to achieve the intended purpose. However, the accompanying drawings are only provided for reference and illustration and are not intended to limit the technical solution of this utility model.

[0021] Example 1 The existing gantry beams lack targeted structural optimization, resulting in a trade-off between mass and rigidity. This manifests as both material redundancy and insufficient rigidity; insufficient material removal occurs in non-load-bearing areas, while load-bearing areas lack sufficient material strength. This increases inertia while compromising structural stability. Furthermore, the existing gantry beams have a chaotic internal structure design with no targeted reinforcing ribs, making the flatness of mounting surfaces for key components such as guide rails and linear scales susceptible to internal structural influences. In terms of dynamic performance, excessive mass fails to meet the acceleration requirements of dispensing and patching operations, leading to low production efficiency. Insufficient rigidity results in significant deformation during movement, severely impacting operational accuracy. Finally, redundant mass increases the load on the drive motor, leading to higher energy consumption during equipment operation.

[0022] In view of this, the present invention provides a gantry beam with a high quality stiffness ratio, such as... Figures 1 to 5 As shown, Figure 1 This is a structural schematic diagram (first view) of a high-quality rigidity ratio gantry beam provided in an embodiment of this utility model; Figure 2 This is a structural schematic diagram (second view) of the high-quality rigidity ratio gantry beam provided in this embodiment of the utility model; Figure 3 This is a structural schematic diagram (front view) of the high-quality rigidity ratio gantry beam provided in this embodiment of the utility model; Figure 4 This is a structural schematic diagram (rear view) of the high-quality rigidity ratio gantry beam provided in this embodiment of the utility model; Figure 5 This is a schematic diagram (top view) of the high-quality rigidity ratio gantry beam provided in this embodiment of the utility model.

[0023] In this embodiment, the high-quality rigidity ratio gantry beam includes a beam body, which has a top wall, a bottom plate, and two side walls connecting the top wall and the bottom plate. The beam body extends along a first direction, and its two ends are respectively provided with beam support surfaces for connection with external fixed support structures. A fish-belly-shaped reinforcing structure 1 extending along the first direction and partially protruding along the second direction is provided in the middle of the bottom plate. Arc transition surfaces 2 are respectively provided at both ends of the bottom plate along the first direction, and smoothly transition to the beam support surfaces at the ends of the beam body through the arc transition surfaces 2. Multiple V-shaped weight-reducing grooves 3 are also provided on the bottom plate. A material removal cavity 4 is provided inside the beam body. The projection contour of the material removal cavity 4 along the third direction is an isosceles trapezoid, and the height of the material removal cavity 4 near the middle area of ​​the beam body is greater than the height of its two ends, that is, the two hypotenuses of the isosceles trapezoid are respectively located at the two ends of the material removal cavity 4 along the first direction. An arc-shaped cutting flared opening 5 communicating with the material removal cavity 4 is provided in the middle of the side wall on one side of the beam body.

[0024] In one optional embodiment, a plurality of first weight-reducing holes 7 are provided on at least one side wall of the main beam body; a plurality of second weight-reducing holes 8 are provided through the fish-belly-shaped reinforcing structure 1.

[0025] It should be noted that the first direction, the second direction, and the third direction are mutually perpendicular. For example, the second direction is the vertical direction (Z), and the first direction and the third direction are two mutually perpendicular directions (X, Y) on the horizontal plane. In other words, the first direction X is the length direction of the main body of the beam, the second direction Z is the thickness direction of the main body of the beam, and the third direction Y is the width direction of the main body of the beam.

[0026] It is worth noting that the high-quality rigidity ratio gantry beam of this invention has an axisymmetric structure along the first direction. Specifically, its main structure adopts a symmetrical design: the fish-belly-shaped reinforcing structure 1 located in the middle of the base plate, the arc transition surface 2 connecting the base plate and the beam support surface, the V-shaped weight-reducing grooves 3 distributed on both sides of the fish-belly-shaped reinforcing structure 1, the material removal cavity 4 inside the beam, the arc-shaped cut-out flared opening on the side wall 5, the thin-walled reinforcing rib 6 used to separate the material removal cavity 4 from the key reinforcement area, the first weight-reducing hole 7 opened on the side wall, and the second weight-reducing hole 8 located on the fish-belly-shaped reinforcing structure 1, all with the midpoint of the gantry beam's length direction as the axis of symmetry. The overall symmetry ensures that the center of mass and the center of geometry of the gantry beam are both located at their geometric centers along the first direction, thereby achieving dynamic balance and avoiding vibration caused by uneven mass distribution.

[0027] Preferably, the high-quality rigidity ratio gantry beam of this utility model can be integrally formed by casting or machining of metal materials. Then, its fish-belly-shaped reinforcing structure 1, arc transition surface 2, V-shaped weight reduction groove 3, material removal cavity 4 and thin-walled reinforcing rib 6 together form an integral lightweight rigid structure, so that the gantry beam can meet the deformation requirements under the predetermined load while optimizing the overall quality.

[0028] In an optional embodiment, the top wall of the main beam body is provided with a guide rail mounting surface for mounting linear guide rails and a grating ruler mounting surface for mounting grating rulers; the side wall of one side of the main beam body is provided with a stator mounting surface for mounting the linear motor stator. The material removal cavity 4 is divided into multiple sub-removal cavities along the first direction by multiple thin-walled reinforcing ribs 6. Considering the machining accuracy of each mounting surface and to avoid the influence of longitudinal bending deformation on its installation accuracy, at least one thin-walled reinforcing rib 6 is provided in the area near the guide rail mounting surface and the grating ruler mounting surface, which not only ensures the overall rigidity of the material removal cavity 4, but also provides support for each mounting surface.

[0029] In an optional embodiment, the fish-belly-shaped reinforcing structure 1 is connected to the side wall of one side of the main beam, and the bottom of the fish-belly-shaped reinforcing structure 1 is set as an arc surface.

[0030] Preferably, the two end planes of the fish-belly-shaped reinforcing structure 1 along the first direction may also be chamfered to further reduce weight.

[0031] In one optional embodiment, multiple V-shaped weight-reducing grooves 3 are symmetrically distributed at both ends of the base plate along a first direction, and each V-shaped weight-reducing groove 3 is located away from the fish-belly-shaped reinforcing structure 1 along a third direction, that is, multiple V-shaped weight-reducing grooves 3 are located on the opposite side of the fish-belly-shaped reinforcing structure 1 along a third direction.

[0032] In an optional embodiment, the upper side of the arc-shaped cut-out flared opening 5 is located near the top wall of the main body of the crossbeam, and the lower side has an arc curvature, with the arc-shaped cut-out flared opening 5 protruding in the second direction. For example, the maximum protrusion of the arc-shaped cut-out flared opening 5 is located at the center of the gantry crossbeam along the first direction, that is, the arc-shaped cut-out flared opening 5 is also an axisymmetric structure.

[0033] The main body of the gantry beam of this utility model is a box-shaped structure extending along its length. In order to enable those skilled in the art to fully understand and implement this utility model, the specific implementation principle of this utility model is explained below in conjunction with a specific application scenario: First, the fish-belly-shaped reinforcing structure 1, located in the middle of the base plate and extending along the length of the gantry beam, serves as a longitudinal reinforcing ridge, specifically enhancing the entire gantry beam's ability to resist vertical bending deformation; the arc transition surface 2 achieves a smooth transition with a smooth arc surface, effectively reducing stress concentration at the root and enhancing structural reliability.

[0034] Then, in the bottom plate area between the fish belly-shaped reinforcing structure 1 and the two side arc transition surfaces 2, V-shaped weight reduction grooves 3 are symmetrically opened. The function of the V-shaped weight reduction grooves 3 is to remove redundant mass in this area. Its V-shaped geometry can maintain the in-plane stiffness of the bottom plate while reducing weight, thus achieving a balance between weight reduction and local stiffness.

[0035] It is understandable that since the mass removed by the V-shaped weight reduction groove 3 has virtually no stress in mechanical analysis, it does not contribute to the overall structural stiffness of the beam and is considered redundant mass. Furthermore, compared to weight reduction grooves that are removed in a rectangular shape, the V-shaped weight reduction groove 3 achieves a balance between weight reduction and stiffness through its V-shaped structure. Its sharp corner structure can control the range of local stress diffusion, minimizing cross-sectional weakening while maintaining in-plane shear stiffness through its inclined side structure.

[0036] Material removal cavities 4 are distributed in the main area inside the crossbeam. The material removal cavities 4 are designed according to the bending moment distribution of the gantry crossbeam under load. Thus, redundant mass is removed reasonably according to the stress distribution, and while optimizing the mass, the remaining material is concentrated more in the key load-bearing positions.

[0037] Understandably, the material removal cavity 4 achieves optimal stress distribution through its symmetrical isosceles trapezoidal cross-section geometry. Its wide base transitions naturally to the bearing surface and the inclined side, allowing the material to concentrate in the middle where the bending moment is greatest and thin out at the two ends where the bending moment is smaller, thus matching the stress characteristics of the gantry beam. In this way, it not only improves bending stiffness but also reduces redundant mass, while ensuring processing feasibility and installation symmetry, achieving a balance between mechanical properties and manufacturing process.

[0038] On the side wall of the crossbeam, there is a circular arc cut-out flared opening 5, which is connected to the internal material removal cavity 4 to further expand the weight reduction space. At the same time, the smooth arc-shaped boundary of the circular arc cut-out flared opening 5 improves the stress distribution of the internal structure and avoids stress concentration caused by sharp corners.

[0039] After the material is removed, thin-walled reinforcing ribs 6 are installed inside to ensure the overall stability of the gantry beam and the accuracy of the mounting surface. The thin-walled reinforcing ribs 6 provide support for the mounting surface, ensuring its flatness and long-term stability.

[0040] To further reduce weight, a first weight-reduction hole 7 can be opened in the non-high-stress area of ​​the side wall, and a second weight-reduction hole 8 can be opened on the fish-belly-shaped reinforcing structure 1. Through the first weight-reduction hole 7 and the second weight-reduction hole 8, auxiliary weight reduction is achieved without significantly weakening the rigidity of the main load-bearing structure.

[0041] Furthermore, since the gantry beam needs to be equipped with core components such as guide rails and grating rulers, in order to meet the assembly requirements of the core components, such as the smoothness after installation of the guide rails and the relative position requirements of the grating ruler and the reading head, the mounting surfaces of these core components are not optimized or are optimized only slightly. Thus, the gantry beam of this utility model forms an asymmetrical structure along a third direction, that is, one side has a functional mounting surface for the core components, and the other side serves as a non-functional surface. By optimizing the structure of the non-functional surface, the goal of maintaining rigidity is achieved while reducing weight.

[0042] Taking the gantry beam of an existing dispensing device as an example, it is machined from a solid square column of AL 6061 steel, with material removed internally through drilling. In actual testing, the beam weighs 17.5 kg, and under rated loads (gravitational acceleration, vertical acceleration 1G, longitudinal load 7 kg, and lateral acceleration 3G), the maximum longitudinal deformation is 4.3 μm. However, this is not the limit. Achieving the same beam precision with a smaller mass allows for a smaller load on the gantry beam and a faster motion response.

[0043] The gantry beam of this utility model, while also being processed using AL 6061 solid square columns, incorporates a fish-belly-shaped reinforcing structure 1, an arc transition surface 2, a V-shaped weight-reducing groove 3, a material removal cavity 4, and thin-walled reinforcing ribs 6. Through simulation and actual testing, its mass can be reduced to approximately 13.9 kg. Under the same rated load (gravitational acceleration, vertical acceleration 1G, longitudinal load 7 kg, and lateral acceleration 3G), the maximum longitudinal deformation does not exceed 4 μm. While ensuring a smaller beam deformation, it achieves a weight reduction of approximately 20% and significantly improves dynamic performance.

[0044] It can be seen that, with the same amount of material, the gantry beam structure of this utility model has higher rigidity and smaller maximum deformation; while meeting the same rigidity requirements, the gantry beam of this utility model is lighter, thus enabling greater motion acceleration and improving the production efficiency and dynamic response performance of the equipment.

[0045] This invention features a high-strength gantry beam with a high rigidity ratio. Through a fish-belly-shaped reinforcement structure located in the center of the base plate, the beam's resistance to longitudinal bending deformation is significantly improved. A smooth transition between the base plate and the beam support surfaces at both ends is achieved using an arc-shaped transition surface, optimizing the load transfer path from the beam body to both ends and reducing stress concentration. A V-shaped weight-reduction groove precisely removes material from non-high-stress areas on both sides of the fish-belly-shaped reinforcement structure, effectively reducing mass. The beam body also includes a material removal cavity with an isosceles trapezoidal cross-section, which facilitates material removal. Further weight-reduction space is expanded in the center through an arc-shaped cut-out. To ensure the machining accuracy and structural stability of critical mounting surfaces, thin-walled reinforcing ribs are installed in the material removal cavity for areas containing these surfaces. This achieves mass optimization while maintaining structural rigidity, thereby improving the beam's acceleration response, motion accuracy, and energy efficiency.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that an article or device comprising a list of elements includes not only those elements but also other elements not expressly listed. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device comprising said element. Terms such as "connected" or "linked" are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect. The orientations or positional relationships indicated by terms such as "upper," "lower," "left," and "right" are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0047] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A high-quality gantry beam with a high stiffness ratio, characterized in that, include: The main body of the beam has a top wall, a bottom plate, and two side walls connecting the top wall and the bottom plate. The main body of the beam extends along a first direction, and its two ends are respectively provided with beam support surfaces for connecting with an external fixed support structure. The base plate has a fish-belly-shaped reinforcing structure extending along the first direction and partially protruding along the second direction in the middle; the base plate has arc transition surfaces at both ends along the first direction, and smoothly transitions to the beam support surface at the end of the beam body through the arc transition surfaces; the base plate also has multiple V-shaped weight reduction grooves. The main body of the crossbeam has a material removal cavity inside, and the projected outline of the material removal cavity along the third direction is an isosceles trapezoid; the material removal cavity is divided into multiple sub-removal cavities along the first direction by multiple thin-walled reinforcing ribs; the middle of the side wall on one side of the main body of the crossbeam has an arc-shaped cut-out flared opening that communicates with the material removal cavity; Wherein, the first direction, the second direction, and the third direction are perpendicular to each other.

2. The high-quality rigidity ratio gantry beam according to claim 1, characterized in that, The top wall of the main body of the crossbeam is provided with a guide rail mounting surface for mounting linear guide rails and a grating ruler mounting surface for mounting grating rulers; the side wall of one side of the main body of the crossbeam is provided with a stator mounting surface for mounting the stator of the linear motor.

3. The high-quality rigidity ratio gantry beam according to claim 2, characterized in that, At least one thin-walled reinforcing rib is provided in the area near the guide rail mounting surface and the grating ruler mounting surface, respectively.

4. The high-quality rigidity ratio gantry beam according to claim 1, characterized in that, The fish-belly-shaped reinforcing structure is connected to the side wall on one side of the main beam, and the bottom of the fish-belly-shaped reinforcing structure is set as an arc surface.

5. The high-quality rigidity ratio gantry beam according to claim 1, characterized in that, The multiple V-shaped weight-reducing grooves are symmetrically distributed at both ends of the base plate along the first direction, and each V-shaped weight-reducing groove is away from the fish-belly-shaped reinforcing structure along the third direction.

6. The high-quality rigidity ratio gantry beam according to claim 1, characterized in that, The height of the material removal cavity near the middle of the main body of the crossbeam is greater than the height of its two ends.

7. The high-quality rigidity ratio gantry beam according to claim 1, characterized in that, The upper side of the arc-shaped cut-out flared opening is located near the top wall of the main body of the crossbeam, and the lower side has an arc curvature, and the arc-shaped cut-out flared opening protrudes towards the second direction.

8. The high-quality rigidity ratio gantry beam according to claim 1, characterized in that, The main body of the crossbeam has a plurality of first weight-reduction holes on at least one side wall.

9. The high-quality rigidity ratio gantry beam according to claim 1, characterized in that, The fish-belly-shaped reinforcing structure has multiple second weight-reducing holes running through it.

10. The high-quality rigidity ratio gantry beam according to claim 1, characterized in that, The high-quality rigidity ratio gantry beam has an axisymmetric structure along the first direction.

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