Crossbar and PCB drill

Abstract

The application relates to a crossbeam and a PCB drilling machine, the crossbeam comprising a first beam and a second beam, the first beam and the second beam being attached to form an attached surface in a direction perpendicular to the length of the crossbeam, the attached surface being provided with an adhesive; the surface of the first beam facing the second beam is provided with a first groove, the first groove being recessed in a direction away from the second beam to form a weight-reducing cavity in the interior of the crossbeam. The application sets the crossbeam as a split structure, and sets the first groove on the first beam, when the first beam and the second beam are fixed by the adhesive, the first groove will form a weight-reducing cavity in the interior of the crossbeam to realize the lightweight design of the crossbeam, thereby improving the natural frequency and mode of the crossbeam, further limiting the resonance of the crossbeam and a main shaft and the like excitation source, and improving the machining precision.

Description

Technical Field

[0001] This application relates to the field of machining equipment technology, and in particular to a beam and PCB drilling machine. Background Technology

[0002] Existing drilling machines used for drilling PCBs typically employ a gantry structure, where the crossbeams are used to mount the spindle that performs the drilling operation.

[0003] However, the existing crossbeams are relatively heavy and have low natural frequencies and modes. Under the excitation of vibration sources such as the spindle, the crossbeams are prone to resonance, which can affect the machining accuracy and may even affect the reliability and stability of the drilling machine. Utility Model Content

[0004] To address the aforementioned problems, this application provides a crossbeam. By specifically optimizing the crossbeam's structure, a first beam and a second beam are joined to form the crossbeam. Grooves are machined into the first beam and / or the second beam to reduce the crossbeam's weight, thereby increasing its natural frequency and modes, and ultimately improving machining accuracy. Furthermore, this application also provides a PCB drilling machine equipped with this crossbeam, specifically including the following solution: In a first aspect, embodiments of this application provide a crossbeam, which includes a first beam and a second beam. The first beam and the second beam are bonded together in a direction perpendicular to the length of the crossbeam to form a bonding surface, and the bonding surface is provided with an adhesive. A first groove is formed on the surface of the first beam facing the second beam. The first groove is recessed in a direction away from the second beam to form a weight-reducing cavity inside the beam.

[0005] This application designs the crossbeam as a split structure, comprising a first beam and a second beam. A first groove is created on the first beam. When the first and second beams are bonded together with adhesive, the first groove forms a weight-reducing cavity inside the crossbeam, achieving a lightweight design. This increases the natural frequency and modes of the crossbeam, thereby limiting resonance between the crossbeam and excitation sources such as the spindle, and improving machining accuracy. Furthermore, the adhesive bonding ensures reliable connection between the first and second beams while avoiding stress concentration issues caused by mechanical connections, extending the crossbeam's service life. In short, this application, through a "split-internal weight reduction-adhesion" integrated structure, achieves high rigidity and lightweight design in the crossbeam, which is beneficial for improving machining accuracy.

[0006] In one embodiment, a second groove is formed on the surface of the second beam facing the first beam, and the second groove is recessed in a direction away from the first beam to form a weight-reducing cavity inside the beam.

[0007] In this embodiment, based on the first groove provided on the first beam, this application can ensure the rigidity of the crossbeam while further reducing the weight of the crossbeam by providing a second groove on the second beam.

[0008] In one embodiment, along the length of the beam, the openings of the first groove and the second groove are positioned opposite each other, and the first groove and the second groove together form a weight-reducing cavity.

[0009] In this embodiment, by setting the openings of the first groove and the second groove opposite each other along the length of the crossbeam, the first and second grooves are symmetrically arranged along the mating surface. This minimizes the weight of the crossbeam while ensuring a uniform mass distribution and optimizing stress distribution. Furthermore, the symmetrical arrangement of the first and second grooves along the mating surface provides a larger and more uniform bonding area, which is beneficial for improving the reliability of the connection between the first and second beams.

[0010] In one embodiment, the first groove and the second groove are arranged alternately along the length of the beam.

[0011] In this embodiment, by arranging the first and second grooves alternately along the length of the beam, it is possible to ensure the beam is lightweight while simultaneously constructing a reinforcing structure similar to a stiffener inside the beam, thereby improving the beam's rigidity. In other words, in this embodiment, by meticulously designing the position of each groove, the beam achieves a balance between lightweight design and high rigidity.

[0012] In one embodiment, the opening of the first groove is connected to the bottom of the first groove by an arc segment.

[0013] In this embodiment, by connecting the opening and bottom of the first groove with a rounded transition, stress concentration can be reduced, ensuring the reliability and service life of the crossbeam. Furthermore, the rounded transition provides a smooth path for the adhesive to flow and fill, ensuring that the adhesive can evenly and continuously cover the entire edge area of ​​the first groove during bonding. This effectively avoids problems such as incomplete adhesive filling or air bubbles at right angles, thus ensuring the integrity and strength of the connection between the first and second beams. In addition, the rounded transition reduces the risk of edge chipping or micro-cracks at the corners of the first groove due to sudden changes in tool path and cutting force during processing.

[0014] In one embodiment, the opening of the second groove is connected to the bottom of the second groove by an arc segment.

[0015] In this embodiment, by connecting the opening and bottom of the second groove with a rounded transition, stress concentration can be reduced, ensuring the reliability and service life of the crossbeam. Furthermore, the rounded transition provides a smooth path for the adhesive to flow and fill, ensuring that the adhesive can evenly and continuously cover the entire edge area of ​​the second groove during bonding. This effectively avoids problems such as incomplete adhesive filling or air bubbles at right angles, thus ensuring the integrity and strength of the connection between the first and second beams. In addition, the rounded transition reduces the risk of edge chipping or micro-cracks at the corners of the second groove due to sudden changes in tool path and cutting force during processing.

[0016] In one embodiment, there are multiple weight-reducing cavities, which are spaced apart along the length of the crossbeam.

[0017] In this embodiment, by setting multiple weight-reducing cavities spaced apart along the length of the crossbeam, on the one hand, the local vibration problem that may be introduced by a single large cavity can be avoided, reducing the possibility of resonance; on the other hand, the spaced weight-reducing cavities naturally form a continuous internal reinforcing rib structure inside the crossbeam, which can enhance the torsional stiffness and deformation resistance of the crossbeam.

[0018] In one embodiment, there are multiple weight-reducing cavities, and adjacent weight-reducing cavities are provided with supporting ribs along the length of the crossbeam.

[0019] In this embodiment, by setting support ribs between adjacent weight-reducing cavities along the length of the beam, the strength of the beam can be improved, and the torsional stiffness and deformation resistance of the beam can be enhanced.

[0020] In one embodiment, along the direction in which the first beam and the second beam are arranged, the ratio of the distance from the opening of the first groove to the bottom of the groove to the thickness of the first beam ranges from 30% to 60%.

[0021] In this embodiment, by setting the ratio of the groove depth of the first groove to the thickness of the first beam within the range of 30% to 60%, it is possible to avoid the first groove being too shallow, resulting in an insignificant weight reduction effect; on the other hand, it is possible to avoid the first groove being too deep, leading to a small thickness between the groove wall and the outer surface of the crossbeam, causing a reduction in stiffness. In other words, by setting the groove depth of the first groove and the thickness of the first beam within the aforementioned range along the direction of the arrangement of the first and second beams, this application balances the requirements for lightweight and high stiffness of the crossbeam, thereby ensuring processing accuracy, stability, and reliability.

[0022] In one embodiment, along the direction in which the first beam and the second beam are arranged, the ratio of the distance from the opening of the second groove to the bottom of the groove to the thickness of the second beam ranges from 30% to 60%.

[0023] In this embodiment, by setting the ratio of the groove depth of the second groove to the thickness of the second beam within the range of 30% to 60%, it is possible to avoid the second groove being too shallow, resulting in an insignificant weight reduction effect; on the other hand, it is possible to avoid the second groove being too deep, leading to a small thickness between the groove wall and the outer surface of the crossbeam, causing a reduction in stiffness. In other words, by setting the groove depth of the second groove and the thickness of the second beam within the aforementioned range along the direction of the arrangement of the first and second beams, this application balances the requirements for lightweight and high stiffness of the crossbeam, thereby ensuring processing accuracy, stability, and reliability.

[0024] In one embodiment, the adhesive includes a structural adhesive.

[0025] In this embodiment, based on the high modulus and high strength characteristics of structural adhesive, using structural adhesive to bond the first and second beams facilitates the formation of a strong and continuous connection at the bonding surface, ensuring the connection strength and structural integrity of the beams. Furthermore, structural adhesive possesses excellent fatigue resistance, and using it to bond the first and second beams helps to improve the service life and reliability of the beams.

[0026] In one embodiment, the adhesive comprises an epoxy resin.

[0027] In this embodiment, since epoxy resin has superior bonding strength, modulus and hardness after curing, it enables the first beam and the second beam to form a rigid connection at the mating surface, which can efficiently transmit load and vibration, and ensure the overall stiffness and load-bearing capacity of the beam.

[0028] In one embodiment, the crossbeam includes fasteners arranged along the direction of the first and second beams, the fasteners passing through at least one of the first and second beams and extending into the other to lock the first and second beams.

[0029] In this embodiment, based on the bonding of the first beam and the second beam with adhesive, this application embodiment also provides fasteners for locking the first beam and the second beam. On the one hand, the fasteners can act as clamps during the adhesive curing process, ensuring that the adhesive forms a dense and solid adhesive layer to guarantee the connection and fixation effect of the first beam and the second beam; on the other hand, the fasteners can serve as a safety redundancy. When the adhesive fails under extreme circumstances (such as severe impact, fire causing temporary softening, etc.), the fasteners can intervene to prevent the beam from disintegrating instantly, providing a guarantee for the safe shutdown of the equipment.

[0030] In one embodiment, the beam is made of granite or marble, and the fasteners include bolts that pass through the mating surfaces to lock the first and second beams.

[0031] In this embodiment, by setting bolts to lock the first and second beams, it is possible to adjust the preload or disassemble and maintain the crossbeams when necessary.

[0032] Secondly, this application provides a PCB drilling machine, which includes a bed, a stage, at least two supports, a spindle, and a crossbeam as described in any of the above embodiments, wherein the stage and supports are respectively supported on the bed, the at least two supports are spaced apart on the bed and arranged on both sides of the stage, the crossbeam is mounted on the at least two supports, and the spindle is mounted on the crossbeam for drilling workpieces.

[0033] It is understood that the PCB drilling machine of the second aspect of this application, because it adopts the crossbeam provided in the first aspect of this application, also has all the beneficial effects that can be obtained in any embodiment provided in the first aspect of this application.

[0034] Thirdly, this application also provides a PCB drilling machine, which includes a bed, a stage, a moving guide rail, a spindle, and a crossbeam as in any of the above embodiments, wherein the stage is supported on the bed, the crossbeam is disposed above the stage, the crossbeam and the bed are slidably connected by the moving guide rail along the length direction perpendicular to the crossbeam, and the spindle is mounted on the crossbeam for drilling the workpiece supported on the stage.

[0035] It is understandable that the PCB drilling machine of the third aspect of this application, because it adopts the crossbeam provided in the first aspect of this application, also has all the beneficial effects that can be obtained in any embodiment provided in the first aspect of this application. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the PCB drilling machine provided in one embodiment of this application; Figure 2 This is a partial structural schematic diagram of a PCB drilling machine provided in one embodiment of this application; Figure 3 This is a schematic diagram of the cross-sectional structure of the first beam provided in one embodiment of this application; Figure 4 This is a schematic diagram of the cross-sectional structure of the beam provided in the first embodiment of this application; Figure 5 for Figure 4 A partial structural diagram at point A in the middle; Figure 6 This is a schematic diagram of the cross-sectional structure of the second beam provided in one embodiment of this application; Figure 7 This is a schematic diagram of the cross-sectional structure of the beam provided in the second embodiment of this application; Figure 8 This is a schematic diagram of the cross-sectional structure of the beam provided in the third embodiment of this application.

[0038] Reference numerals: 200-PCB drilling machine; 201-bed; 202-platform; 203-support column; 204-spindle; 100-crossbeam; 10-first beam; 11-first groove; 12-first arc segment; 20-second beam; 21-second groove; 22-second arc segment; 30-matting surface; 31-adhesive; 40-weight reduction cavity; 41-support rib; 50-fastener; 001-first direction. Detailed Implementation

[0039] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0040] The following descriptions of the embodiments are based on the accompanying illustrations and are used to illustrate specific embodiments in which this application can be implemented. The component designations used herein, such as "first," "second," etc., are merely for distinguishing the described objects and have no sequential or technical meaning. Unless otherwise specified, the terms "connection" and "linkage" used in this application include both direct and indirect connections (linkages). Directional terms used in this application, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "side," etc., are merely for reference to the accompanying illustrations. Therefore, the use of directional terms is for better and clearer explanation and understanding of this application, and does not indicate or imply that the referred device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this application.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising," "may include," "include," or "may include" used in this application indicate the presence of the corresponding disclosed function, operation, element, etc., and do not limit one or more other functions, operations, elements, etc. Moreover, the terms "comprising" or "include" indicate the presence of the corresponding features, number, steps, operations, elements, components, or combinations thereof disclosed in the specification, but do not exclude the presence or addition of one or more other features, number, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusion.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0043] Please refer to the above. Figure 1 , Figure 1 This is a schematic diagram of the structure of a PCB drilling machine 200 provided in one embodiment of this application.

[0044] like Figure 1 As shown, the PCB drilling machine 200 provided in this application includes a bed 201, a stage 202, at least two supports 203, a spindle 204, and a crossbeam 100. The stage 202 and supports 203 are respectively supported on the bed 201. The stage 202 is mounted on the bed 201 and is used to carry the workpiece. The at least two supports 203 are also mounted on the bed 201, spaced apart and positioned on both sides of the stage 202. The crossbeam 100 is supported by the at least two supports 203, and the crossbeam 100 and the supports 203 together form a gantry frame. The spindle 204 is mounted on the crossbeam 100 and is used to drill holes in the workpiece.

[0045] It should be noted that the structure of the PCB drilling machine 200 in the above embodiments is only an example. For example, in another embodiment, the PCB drilling machine 200 provided in this application includes a bed 201, a stage 202, a moving guide rail, a spindle 204, and a crossbeam 100. The stage 202 is supported on the bed 201. The stage 202 is disposed on the bed 201 and is used to carry the workpiece. The crossbeam 100 is disposed above the stage 202, and the crossbeam 100 is slidably connected to the bed 201 via the moving guide rail. The moving guide rail extends along a direction perpendicular to the length of the crossbeam 100, and the crossbeam 100 slides relative to the bed 201 along the extension direction of the moving guide rail. The spindle 204 is mounted on the crossbeam 100 and is used to drill holes in the workpiece.

[0046] Please cooperate. Figures 2 to 5 ,in Figure 2 This is a partial structural schematic diagram of the PCB drilling machine 200 provided in one embodiment of this application; Figure 3 This is a schematic diagram of the cross-sectional structure of the first beam 10 provided in one embodiment of this application; Figure 4 This is a schematic diagram of the cross-sectional structure of the beam 100 provided in the first embodiment of this application; Figure 5 for Figure 4 A schematic diagram of the local structure at point A in the middle.

[0047] like Figures 2 to 5 As shown, at least two support columns 203 are arranged at intervals along a first direction 001. The crossbeam 100 provided in this application is supported by at least two support columns 203 along the first direction 001. The crossbeam 100 provided in this application includes a first beam 10 and a second beam 20. The length directions of the first beam 10 and the second beam 20 are parallel to the first direction 001, respectively. Along a direction perpendicular to the length of the crossbeam 100, the first beam 10 and the second beam 20 are bonded together to form a bonding surface 30, and an adhesive 31 is provided on the bonding surface 30. That is, the first beam 10 and the second beam 20 are bonded and fixed together by the adhesive 31 along a direction perpendicular to the length of the crossbeam 100.

[0048] A first groove 11 is formed on the surface of the first beam 10 facing the second beam 20. The first groove 11 is recessed in a direction away from the second beam 20. The second beam 20 fits against the first beam 10 in a direction perpendicular to the length of the crossbeam 100 and covers the opening of the first groove 11 of the first beam 10, so as to form a weight-reducing cavity 40 inside the crossbeam 100.

[0049] This application designs the crossbeam 100 as a split structure, comprising a first beam 10 and a second beam 20. A first groove 11 is provided on the first beam 10. When the first beam 10 and the second beam 20 are bonded together with adhesive 31, the first groove 11 forms a weight-reducing cavity 40 inside the crossbeam 100, achieving a lightweight design. This improves the natural frequency and modes of the crossbeam 100, thereby limiting resonance between the crossbeam 100 and excitation sources such as the spindle 204, and improving machining accuracy. Furthermore, fixing the first beam 10 and the second beam 20 with adhesive 31 ensures reliable connection between them while avoiding stress concentration problems caused by mechanical connections, thus extending the service life of the crossbeam 100. In short, this application, through a "split-internal weight reduction-bonding" overall structure, achieves high rigidity and lightweight design in the crossbeam 100, which is beneficial for improving machining accuracy.

[0050] In one embodiment, the opening of the first groove 11 and the bottom of the first groove 11 are connected by an arc segment. For ease of explanation, this arc segment is defined as the first arc segment 12, which connects the opening and the bottom of the first groove 11.

[0051] In this embodiment, by connecting the opening and bottom of the first groove 11 with a first arc segment 12, stress concentration can be reduced, ensuring the reliability and service life of the crossbeam 100. Furthermore, the transition of the first arc segment 12 provides a smooth path for the flow and filling of the adhesive 31, ensuring that the adhesive 31 can uniformly and continuously cover the entire edge area of ​​the first groove 11 during bonding. This effectively avoids problems such as incomplete adhesive filling or air bubbles at right angles, thus ensuring the integrity and strength of the connection between the first beam 10 and the second beam 20. In addition, the first arc segment 12 transition reduces the process risk of edge chipping or micro-cracks at the corners of the first groove 11 due to sudden changes in tool path and cutting force during processing.

[0052] In one embodiment, along the direction in which the first beam 10 and the second beam 20 are arranged, the ratio of the distance from the opening to the bottom of the first groove 11 to the thickness of the first beam 10 ranges from 30% to 60%. For ease of explanation, this application defines the distance from the opening to the bottom of the first groove 11 as D1 and the thickness of the first beam 10 as W1, where the ratio of D1 to W1 is between 30% and 60%. Alternatively, it can be understood that along the direction in which the first beam 10 and the second beam 20 are arranged, the ratio of the groove depth of the first groove 11 to the thickness of the first beam 10 is between 30% and 60%.

[0053] In this embodiment, by setting the ratio of the groove depth of the first groove 11 to the thickness of the first beam 10 within the range of 30% to 60%, it can avoid the first groove 11 being too shallow, resulting in an insignificant weight reduction effect; on the other hand, it can avoid the first groove 11 being too deep, which would lead to a small thickness between the groove wall of the first groove 11 and the outer surface of the crossbeam 100, causing a reduction in rigidity. In other words, by setting the groove depth of the first groove 11 and the thickness of the first beam 10 within the above-mentioned range along the direction in which the first beam 10 and the second beam 20 are arranged, this application balances the requirements for lightweight and high rigidity of the crossbeam 100, thereby ensuring processing accuracy, stability, and reliability.

[0054] Please refer to the above. Figure 6 , Figure 6 This is a schematic diagram of the cross-sectional structure of the second beam 20 provided in one embodiment of this application.

[0055] like Figure 6 As shown, in one embodiment, a second groove 21 is formed on the surface of the second beam 20 facing the first beam 10, and the second groove 21 is recessed in a direction away from the first beam 10. The first beam 10 and the second beam 20 are fitted together in a direction perpendicular to the length of the crossbeam 100, and cover the opening of the second groove 21 of the second beam 20 to form a weight-reducing cavity 40 inside the crossbeam 100.

[0056] In this embodiment, based on the first groove 11 provided on the first beam 10, this application can ensure the rigidity of the crossbeam 100 while further reducing the weight of the crossbeam 100 by providing a second groove 21 on the second beam 20.

[0057] Please refer to the above. Figure 7 , Figure 7 This is a schematic diagram of the cross-sectional structure of the beam 100 provided in the second embodiment of this application.

[0058] like Figure 7 As shown, in one embodiment, along the length of the crossbeam 100, the openings of the first groove 11 and the second groove 21 are arranged opposite to each other, and the first groove 11 and the second groove 21 together form a weight-reducing cavity 40. That is, the first groove 11 and the second groove 21 are symmetrically arranged about the mating surfaces 30 of the first beam 10 and the second beam 20.

[0059] In this embodiment, by setting the openings of the first groove 11 and the second groove 21 opposite each other along the length of the crossbeam 100, the first groove 11 and the second groove 21 are symmetrically arranged along the mating surface 30. This can minimize the weight of the crossbeam 100 while ensuring a uniform mass distribution and optimizing the stress distribution of the crossbeam 100. Simultaneously, the symmetrical arrangement of the first groove 11 and the second groove 21 along the mating surface 30 provides a larger and more uniform bonding area, which is beneficial for improving the reliability of the connection between the first beam 10 and the second beam 20.

[0060] It should be noted that the relative positions of the first groove 11 and the second groove 21 in the above embodiments are merely illustrative and do not represent the relative positions of the first groove 11 and the second groove 21 in other embodiments of this application. For example, please refer to... Figure 8 , Figure 8 This is a schematic diagram of the cross-sectional structure of the beam 100 provided in the third embodiment of this application.

[0061] like Figure 8 As shown, in another embodiment, the first groove 11 and the second groove 21 are arranged alternately along the length of the crossbeam 100. That is, the first groove 11 and the second groove 21 are spaced apart along the length of the crossbeam 100.

[0062] In this embodiment, by arranging the first groove 11 and the second groove 21 alternately along the length of the crossbeam 100, it is possible to ensure that the crossbeam 100 is lightweight while constructing a reinforcing structure similar to a stiffener inside the crossbeam 100, thereby improving the rigidity of the crossbeam 100. That is, in this embodiment, by meticulously designing the position of each groove, the crossbeam 100 can achieve both superior lightweighting and high rigidity.

[0063] In one embodiment, the opening of the second groove 21 and the bottom of the second groove 21 are connected by an arc segment. For ease of explanation, this arc segment is defined as the second arc segment 22, which connects the opening and the bottom of the second groove 21.

[0064] In this embodiment, by connecting the opening and bottom of the second groove 21 with a second arc segment 22, stress concentration can be reduced, ensuring the reliability and service life of the crossbeam 100. Furthermore, the transition of the second arc segment 22 provides a smooth path for the flow and filling of the adhesive 31, ensuring that the adhesive 31 can uniformly and continuously cover the entire edge area of ​​the second groove 21 during bonding. This effectively avoids problems such as incomplete adhesive filling or air bubbles at right angles, thus ensuring the integrity and strength of the connection between the first beam 10 and the second beam 20. In addition, the transition of the second arc segment 22 reduces the process risk of edge chipping or micro-cracks at the corners of the second groove 21 due to sudden changes in tool path and cutting force during processing.

[0065] In one embodiment, along the direction in which the first beam 10 and the second beam 20 are arranged, the ratio of the distance from the opening to the bottom of the second groove 21 to the thickness of the second beam 20 ranges from 30% to 60%. For ease of explanation, this application defines the distance from the opening to the bottom of the second groove 21 as D2 and the thickness of the second beam 20 as W2, where the ratio of D2 to W2 is between 30% and 60%. Alternatively, it can be understood that along the direction in which the first beam 10 and the second beam 20 are arranged, the ratio of the groove depth of the second groove 21 to the thickness of the second beam 20 is between 30% and 60%.

[0066] In this embodiment, by setting the ratio of the groove depth of the second groove 21 to the thickness of the second beam 20 within the range of 30% to 60%, it is possible to avoid the second groove 21 being too shallow, resulting in an insignificant weight reduction effect; on the other hand, it is possible to avoid the second groove 21 being too deep, which would lead to a small thickness between the groove wall of the second groove 21 and the outer surface of the crossbeam 100, causing a reduction in rigidity. In other words, by setting the groove depth of the second groove 21 and the thickness of the second beam 20 within the above-mentioned range along the direction in which the first beam 10 and the second beam 20 are arranged, this application balances the requirements for lightweighting and high rigidity of the crossbeam 100, thereby ensuring processing accuracy, stability, and reliability.

[0067] In one embodiment, there are multiple weight-reducing cavities 40, which are spaced apart along the length of the crossbeam 100.

[0068] In this embodiment, by setting multiple weight-reducing cavities 40 arranged at intervals along the length of the crossbeam 100, on the one hand, the local vibration problem that may be introduced by a single large cavity can be avoided, and the possibility of resonance can be reduced; on the other hand, the weight-reducing cavities 40 arranged at intervals naturally form a continuous internal reinforcing rib structure inside the crossbeam 100, which can enhance the torsional stiffness and deformation resistance of the crossbeam 100.

[0069] In one embodiment, there are multiple weight-reducing cavities 40, and adjacent weight-reducing cavities 40 are provided with supporting ribs 41 along the length direction of the crossbeam 100.

[0070] In this embodiment, by providing support ribs 41 between adjacent weight-reducing cavities 40 along the length of the crossbeam 100, the strength of the crossbeam 100 can be improved, thereby enhancing the torsional stiffness and deformation resistance of the crossbeam 100.

[0071] In one embodiment, adhesive 31 includes structural adhesive.

[0072] In this embodiment, based on the high modulus and high strength characteristics of structural adhesive, using structural adhesive to bond the first beam 10 and the second beam 20 facilitates the formation of a strong and continuous connection at the bonding surface 30, ensuring the connection strength and structural integrity of the beam 100. Furthermore, structural adhesive has excellent fatigue resistance, and using it to bond the first beam 10 and the second beam 20 helps to improve the service life and reliability of the beam 100.

[0073] In one embodiment, adhesive 31 comprises epoxy resin.

[0074] In this embodiment, since epoxy resin has superior bonding strength, modulus and hardness after curing, it enables the first beam 10 and the second beam 20 to form a rigid connection at the mating surface 30, which can efficiently transmit load and vibration, and ensure the overall rigidity and load-bearing capacity of the crossbeam 100.

[0075] In one embodiment, the crossbeam 100 includes a fastener 50. Along the direction in which the first beam 10 and the second beam 20 are arranged, the fastener 50 passes through at least one of the first beam 10 and the second beam 20 and extends into the other to lock the first beam 10 and the second beam 20. Exemplarily, in Figure 5 In the illustration, fastener 50 passes through the first beam 10 and extends into the second beam 20.

[0076] In this embodiment, based on the bonding of the first beam 10 and the second beam 20 by adhesive 31, this embodiment of the application also provides fasteners 50 for locking the first beam 10 and the second beam 20. On the one hand, the fasteners 50 can act as clamps during the curing process of the adhesive 31, ensuring that the adhesive 31 forms a dense and solid adhesive layer, thereby guaranteeing the connection and fixation effect of the first beam 10 and the second beam 20; on the other hand, the fasteners 50 can serve as a safety redundancy. When the adhesive 31 fails under extreme circumstances (such as severe impact, fire causing temporary softening, etc.), the fasteners 50 can intervene to prevent the crossbeam 100 from disintegrating instantly, providing a guarantee for the safe shutdown of the equipment.

[0077] In one embodiment, the beam 100 is made of granite or marble, and the fastener 50 includes bolts that pass through the mating surface 30 to lock the first beam 10 and the second beam 20.

[0078] In this embodiment, by setting bolts to lock the first beam 10 and the second beam 20, it is possible to adjust the preload or disassemble and maintain the crossbeam 100 when necessary.

[0079] In one embodiment, the first beam 10 and the second beam 20 are arranged vertically, with the first beam 10 positioned above the second beam 20. This results in lower bending stress on the mating surfaces 30 of the first beam 10 and the second beam 20, which improves the reliability of the connection between them. Furthermore, during the curing process of the adhesive 31, gravity allows the first beam 10 to apply pressure to the second beam 20, facilitating the formation of a dense and solid adhesive layer and ensuring a secure connection between the first beam 10 and the second beam 20.

[0080] In another embodiment, the first beam 10 and the second beam 20 can be arranged horizontally, that is, the first beam 10 and the second beam 20 are arranged side by side in the horizontal direction. Along the direction in which the first beam 10 and the second beam 20 are arranged, two guide rails are provided on the surface of the first beam 10 opposite to the second beam 20, and the guide rails are used to mount the spindle 204.

[0081] In this embodiment, since guide rails need to be installed on the front surface of the crossbeam 100, the flatness of the front surface of the crossbeam 100 can be improved by arranging the first beam 10 and the second beam 20 in the horizontal direction, ensuring the parallelism of the two guide rails and reducing the debugging difficulty of installing the spindle 204.

[0082] It should be understood that the terms "first," "second," etc., 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. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0083] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the 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.

[0084] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims. Those skilled in the art will understand that implementing all or part of the processes of the above embodiments, and making equivalent changes according to the claims of this application, still falls within the scope of this application.

Claims

1. A crossbeam, characterized in that, The crossbeam includes a first beam and a second beam, the first beam and the second beam are bonded together in a direction perpendicular to the length of the crossbeam to form a bonding surface, and the bonding surface is provided with adhesive; A first groove is formed on the surface of the first beam facing the second beam. The first groove is recessed in a direction away from the second beam to form a weight-reducing cavity inside the beam.

2. The crossbeam according to claim 1, characterized in that, The second beam has a second groove on its surface facing the first beam. The second groove is recessed in a direction away from the first beam to form the weight-reducing cavity inside the beam.

3. The crossbeam according to claim 2, characterized in that, Along the length of the crossbeam, the opening of the first groove and the opening of the second groove are positioned opposite each other, and the first groove and the second groove together form the weight-reducing cavity; Alternatively, the first groove and the second groove may be arranged alternately along the length of the crossbeam.

4. The crossbeam according to claim 1, characterized in that, The opening of the first groove is connected to the bottom of the first groove by an arc segment.

5. The crossbeam according to claim 2, characterized in that, The number of weight-reducing cavities is multiple, and supporting ribs are provided for adjacent weight-reducing cavities along the length direction of the crossbeam.

6. The crossbeam according to claim 2, characterized in that, Along the direction in which the first beam and the second beam are arranged, the ratio of the distance from the opening to the bottom of the first groove to the thickness of the first beam is in the range of 30% to 60%, and the ratio of the distance from the opening to the bottom of the second groove to the thickness of the second beam is in the range of 30% to 60%.

7. The crossbeam according to any one of claims 1-6, characterized in that, The crossbeam includes fasteners arranged along the direction of the first beam and the second beam, the fasteners passing through at least one of the first beam and the second beam and extending into the other to lock the first beam and the second beam.

8. The crossbeam according to claim 7, characterized in that, The beam is made of granite or marble, and the fasteners include bolts that pass through the mating surfaces to lock the first beam and the second beam.

9. A PCB drilling machine, characterized in that, The machine includes a bed, a platform, at least two supports, a spindle, and a crossbeam as described in any one of claims 1-8. The platform and the supports are respectively supported on the bed. The at least two supports are spaced apart on the bed and positioned on both sides of the platform. The crossbeam is mounted on the at least two supports, and the spindle is mounted on the crossbeam for drilling workpieces supported on the platform.

10. A PCB drilling machine, characterized in that, The machine includes a bed, a table, a moving guide rail, a spindle, and a crossbeam as described in any one of claims 1-8. The table is supported on the bed, the crossbeam is disposed above the table, the crossbeam and the bed are slidably connected via the moving guide rail along a length direction perpendicular to the crossbeam, and the spindle is mounted on the crossbeam for drilling workpieces supported on the table.

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