A drilling device for multi-layer plywood porous processing

CN122808032APending Publication Date: 2026-09-25XIAYI AOXIANG WOOD IND CO LTD
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Patent Information

Application Number
CN202611208594.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-08-11
Publication Date
2026-09-25

AI Technical Summary

Technical Problem

[0004]针对上述情况,为克服现有技术之缺陷,本发明提供一种用于多层胶合板多孔加工的钻孔设备,以解决单次仅能够对单板进行钻孔加工,加工效率较低,且同批次板材孔位一致性差,以及部分钻孔设备可进行叠层钻孔,但是,板与板之间层间压紧力不均,易出现层间孔位错位、板材滑移的问题,影响最终钻孔质量的问题

Benefits of technology

1、通过设置两个可调间距的钻孔组件,并配合移动组件驱动加工部件整体进给,能够在一次装夹多层胶合板后,依次完成多个预设位置的钻孔作业,由于所有钻孔动作均在同一装夹状态下完成,且两个钻头间距可通过调节组件精确调整,同批次板材的孔位相对位置精度得到可靠保障,避免了多次定位产生的累积误差。

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Abstract

The present application relates to plywood drilling processing field, concretely for a kind of multilayer plywood multi-hole processing drilling equipment, including base, workbench and processing component, workbench is fixedly connected in the middle part of base by support leg, two groups of sliding grooves and two groups of drilling grooves are set in workbench, slidingly connected with moving platform in each sliding groove, the two sides of each moving platform are provided with the abutting assembly for auxiliary support, lifting groove is set in moving platform, pressure plate is slidingly connected in lifting groove, by setting two adjustable spacing drilling components, and cooperate with moving assembly to drive processing component overall feed, can be completed in once clamping multilayer plywood, drilling operation of multiple preset positions in turn, since all drilling actions are completed in the same clamping state, and the distance between two drill bits can be accurately adjusted by adjusting assembly, the relative position accuracy of hole of same batch of plate is reliably guaranteed, and the cumulative error generated by multiple positioning is avoided.
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Description

Technical Field

[0001] This invention relates to the field of plywood drilling technology, and more specifically to a drilling device for multi-hole processing of multi-layer plywood. Background Technology

[0002] Multi-layer plywood is a laminated structural board and a common substrate in furniture manufacturing and building decoration. During the production process, drilling is often required at multiple locations on the board. Existing plywood drilling equipment mostly adopts a single-board sequential processing mode, which has the following problems: First, it can only drill a single board at a time, resulting in low processing efficiency and poor consistency of hole positions within the same batch of boards; Second, some drilling equipment can perform stacked drilling, but uneven interlayer clamping force between boards can easily lead to misalignment of interlayer holes and board slippage, affecting the final drilling quality.

[0003] Therefore, the present invention provides a drilling device for multi-hole processing of multi-layer plywood to solve the above-mentioned problems. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a drilling device for multi-hole processing of multi-layer plywood, which solves the problems of low processing efficiency due to the ability to drill only a single veneer at a time, poor consistency of hole positions in the same batch of boards, and the fact that some drilling devices can perform stacked drilling, but uneven interlayer clamping force between boards can easily lead to misalignment of interlayer holes and board slippage, affecting the final drilling quality.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A drilling device for multi-hole processing of plywood includes a base, a worktable, and processing components.

[0006] The workbench is fixedly connected to the middle of the base by support legs. The workbench has two sets of sliding grooves and two sets of drilling grooves. A movable platform is slidably connected in each sliding groove. Each movable platform has a backing component for auxiliary support on both sides. A lifting groove is provided on the movable platform, and a pressure plate is slidably connected in the lifting groove.

[0007] The base is equipped with a drive assembly for moving two sets of moving platforms in opposite directions, and the abutment assembly on the moving platforms completes the lateral positioning and fixing of multiple plywoods. The base is also equipped with a lifting assembly for synchronously raising and lowering multiple pressure plates, and the pressure plates complete the vertical fixing of multiple plywoods.

[0008] The processing component includes two drilling assemblies and an adjustment assembly. The drilling spacing between the two drilling assemblies is adjusted by the adjustment assembly. The base is provided with a moving assembly for adjusting the position of the processing component. The moving assembly completes multi-point drilling of the drilling assemblies.

[0009] Preferably, the abutment component includes a fixed plate fixedly connected to the side of the moving platform, an adjusting screw threadedly connected to the fixed plate, one end of the adjusting screw being rotatably connected to the abutment plate, and a guide rod fixedly connected to the abutment plate, the guide rod being slidably connected to the fixed plate.

[0010] Preferably, the drive assembly includes a first motor mounted on the base, the output shaft of the first motor is equipped with a first one-way screw, the top end of the first one-way screw is rotatably connected to the worktable, a lifting block is threaded onto the first one-way screw, two sets of hinge rods are hinged on the lifting block, and a hinge seat is hinged to the end of the hinge rod away from the lifting block, and the hinge seat is fixedly connected to the moving platform.

[0011] Preferably, the lifting assembly includes a lifting plate, a clearance groove is formed in the middle of the lifting plate, two sets of guide grooves are formed on the lifting plate, a linkage rod is slidably connected in each guide groove, two limiting plates are fixedly connected to each linkage rod, and the limiting plates are respectively located above and below the lifting plate, the top end of the linkage rod passes through the lifting groove and is fixedly connected to the pressure plate, and at least one first electric push rod is installed on the base, and the telescopic end of the first electric push rod is fixedly connected to the lifting plate.

[0012] Preferably, two sets of collecting dishes are placed on the upper surface of the lifting plate, with the open end of the collecting dishes located below the drilled groove.

[0013] Preferably, one end of the pressure plate is located inside the lifting groove, and the other end of the pressure plate is located outside the lifting groove.

[0014] Preferably, the drilling assembly includes a third motor, and the output shaft of the third motor is fitted with a drill bit via a coupling.

[0015] Preferably, the adjustment component includes a control box, which has a groove and a moving groove, and the moving groove is connected to the groove. Two moving blocks are slidably connected in the moving groove. A second electric push rod is installed on the moving block, and the telescopic end of the second electric push rod is installed on a third motor.

[0016] Preferably, a second motor is mounted on one side of the control box, and a bidirectional screw is mounted on the output shaft of the second motor. The bidirectional screw is rotatably connected to a groove, and the two moving blocks are respectively threaded to the two ends of the bidirectional screw.

[0017] Preferably, the moving assembly includes two first supports, two second supports, a second one-way screw, and a guide rod. The bottom ends of the two first supports and the two second supports are fixedly connected to the base. The two ends of the second one-way screw are rotatably connected to the first supports and the second supports, respectively. The two ends of the guide rod are fixedly connected to the first supports and the second supports, respectively. A fourth motor is mounted on the second support, and the output shaft of the fourth motor is mounted on the second one-way screw via a coupling. A moving seat is threaded onto the second one-way screw. A guide block is slidably connected onto the guide rod. The two ends of the control box are fixedly connected to the moving seat and the guide block, respectively.

[0018] The beneficial effects of this invention are as follows: 1. By setting two adjustable-spacing drilling components and cooperating with the moving component to drive the overall feed of the processing parts, drilling operations at multiple preset positions can be completed sequentially after clamping multiple layers of plywood. Since all drilling actions are completed in the same clamping state, and the distance between the two drill bits can be precisely adjusted by the adjusting component, the relative position accuracy of the holes in the same batch of boards is reliably guaranteed, avoiding the cumulative error caused by multiple positioning.

[0019] 2. The drive assembly drives the two moving platforms to move synchronously in opposite directions. In conjunction with the adjusting screw and the abutment plate in the abutment assembly, it achieves lateral adaptive clamping and auxiliary support for plywood of different widths. Meanwhile, the lifting assembly drives all the pressure plates to press down vertically along the lifting groove, applying a uniform and stable vertical clamping force to the multi-layer plywood. The use of a two-way fixing method in both the lateral and vertical directions ensures that there is no relative slippage between the boards during the drilling process, and the interlayer clamping force is evenly distributed, which improves the overlap of the holes in the multi-layer drilling and the overall processing quality. Attached Figure Description

[0020] Figure 1 The three-dimensional representation of the present invention Figure 1 .

[0021] Figure 2 The three-dimensional representation of the present invention Figure 2 .

[0022] Figure 3 This is a top view of the present invention.

[0023] Figure 4 This is a cross-sectional view of the present invention.

[0024] Figure 5 This is a schematic diagram of the installation of the abutment component on the mobile platform in this invention.

[0025] Figure 6 For the present invention Figure 4 An enlarged schematic diagram of the structure at point A in the middle.

[0026] Figure 7 This is a schematic diagram of the structure of the processed component in this invention.

[0027] In the diagram: 1. Base; 2. Workbench; 3. Moving table; 4. Lifting assembly; 41. First electric push rod; 42. Lifting plate; 43. Collection dish; 44. Residual material groove; 45. Guide groove; 46. Linkage rod; 47. Limiting plate; 5. Drive assembly; 51. First motor; 52. First one-way screw; 53. Lifting block; 54. Hinge rod; 55. Hinge seat; 6. Abutment assembly; 61. Fixing plate; 62. Adjusting screw; 63. Abutment plate; 64. Guide rod; 7. Machining components; 71. Control box; 72. Groove; 73. Second motor; 74. Bidirectional screw; 75. Moving groove; 76. Second electric push rod; 77. Moving block; 78. Third motor; 79. Drill bit; 8. Moving assembly; 81. First support; 82. Second support; 83. Guide rod; 84. Guide block; 85. Fourth motor; 86. Second unidirectional screw; 87. Moving seat; 21. Slide groove; 22. Drilling groove; 9. Pressure plate; 31. Lifting groove. Detailed Implementation

[0028] The following will refer to the attached reference. Figures 1 to 7 The various embodiments of the present invention will be described in detail below. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0029] A drilling device for multi-hole processing of plywood includes a base 1, a worktable 2, and processing components 7.

[0030] The workbench 2 is fixedly connected to the middle of the base 1 by the support legs. The workbench 2 has two sets of sliding grooves 21 and two sets of drilling grooves 22. Each sliding groove 21 is slidably connected to a moving platform 3. Each moving platform 3 has a support component 6 for auxiliary support on both sides. The moving platform 3 has a lifting groove 31. A pressure plate 9 is slidably connected to the lifting groove 31.

[0031] The workbench 2 provides a support base for the plywood, the movable table 3 can slide along the slide groove 21 to adjust the lateral clamping distance, and the drilling groove 22 provides working space for the drill bit. One clamping can meet the support and positioning requirements of multi-layer plywood. The setting of the drilling groove 22 avoids processing interference and improves the safety and reliability of drilling.

[0032] The base 1 is provided with a drive assembly 5 for moving two sets of moving platforms 3 towards each other, and the abutment assembly 6 on the moving platform 3 completes the lateral positioning and fixing of multiple plywoods. The base 1 is also provided with a lifting assembly 4 for synchronously raising and lowering multiple pressure plates 9, and the pressure plates 9 complete the vertical fixing of multiple plywoods.

[0033] The drive component 5 will move the moving table 3 closer together, and cooperate with the abutment component 6 to achieve lateral adaptive clamping. Meanwhile, the lifting component 4 will simultaneously drive each pressure plate 9 to press down, and stably press the plywood onto the moving table 3, thus fixing the multi-layer plywood in both directions, effectively preventing the board from moving or misaligning during processing, and ensuring the accuracy of the drilling position.

[0034] The processing component 7 includes two drilling assemblies and an adjustment assembly. The drilling distance between the two drilling assemblies is adjusted by the adjustment assembly. The base 1 is provided with a moving assembly 8 for adjusting the position of the processing component 7. The multi-point drilling of the drilling assembly is completed by the moving assembly 8.

[0035] The distance between the two drill bits can be flexibly changed by adjusting the component. The moving component 8 drives the entire processing part 7 to move, drilling holes in different preset positions in sequence. It can adapt to various hole spacing requirements and complete multi-point drilling in a single clamping, thus improving processing efficiency.

[0036] In this embodiment, the abutment component 6 includes a fixed plate 61 fixedly connected to the side of the movable platform 3. An adjusting screw 62 is threadedly connected to the fixed plate 61. One end of the adjusting screw 62 is rotatably connected to an abutment plate 63. A guide rod 64 is fixedly connected to the abutment plate 63 and is slidably connected to the fixed plate 61.

[0037] Rotating the adjusting screw 62 causes the abutment plate 63 to move horizontally, and the guide rod 64 prevents the abutment plate 63 from rotating horizontally, ensuring that the abutment plate 63 smoothly abuts against the side of the plywood, and can provide lateral auxiliary positioning for plywood of different widths.

[0038] In this embodiment, the drive assembly 5 includes a first motor 51 mounted on the base 1. The output shaft of the first motor 51 is equipped with a first one-way screw 52. The top end of the first one-way screw 52 is rotatably connected to the worktable 2. A lifting block 53 is threaded onto the first one-way screw 52. Two sets of hinge rods 54 are hinged onto the lifting block 53. A hinge seat 55 is hinged to the end of the hinge rod 54 away from the lifting block 53. The hinge seat 55 is fixedly connected to the moving table 3.

[0039] The first motor 51 drives the first one-way screw 52 to rotate, causing the lifting block 53 to move up and down. Through the hinge rod 54, it drives the two moving platforms 3 to move synchronously towards or away from each other, realizing the synchronous centering movement of the two moving platforms 3.

[0040] The first motor, 51, is a rotatable worm gear motor, which has its own worm gear structure and self-locking capability.

[0041] In this embodiment, the lifting assembly 4 includes a lifting plate 42, a clearance groove 44 is provided in the middle of the lifting plate 42, and two sets of guide grooves 45 are provided on the lifting plate 42. A linkage rod 46 is slidably connected in each guide groove 45. Two limiting plates 47 are fixedly connected to each linkage rod 46, and the limiting plates 47 are located above and below the lifting plate 42 respectively. The top end of the linkage rod 46 passes through the lifting groove 31 and is fixedly connected to the pressure plate 9. At least one first electric push rod 41 is installed on the base 1, and the telescopic end of the first electric push rod 41 is fixedly connected to the lifting plate 42.

[0042] The first electric push rod 41 drives the lifting plate 42 to rise and fall, and through the linkage rod 46, it synchronously drives all the pressure plates 9 to press down or rise. When pressing down, the pressure plate 9 applies a downward force to multiple plywoods to avoid excessive gaps between the plywoods.

[0043] In this embodiment, two sets of collection dishes 43 are placed on the upper surface of the lifting plate 42, and the open end of the collection dish 43 is located below the drilled groove 22.

[0044] The drill chips generated during processing fall directly into the collection dish 43 through the drill groove 22, which can effectively collect the drill chips and keep the workbench clean.

[0045] In this embodiment, one end of the pressure plate 9 is located inside the lifting groove 31, and the other end of the pressure plate 9 is outside the lifting groove 31. The pressure plate 9 can move vertically under the guidance of the lifting groove 31, and the extended part covers the edge of the plywood. The beneficial effect is that the installation and guidance of the pressure plate 9 are integrated into the moving table 3, the structure is compact, and it can provide a stable and uniform vertical clamping force.

[0046] In this embodiment, the drilling assembly includes a third motor 78, and the output shaft of the third motor 78 is fitted with a drill bit 79 via a coupling.

[0047] In this embodiment, the adjustment component includes a control box 71. The control box 71 has a groove 72 and a moving groove 75, and the moving groove 75 is connected to the groove 72. Two moving blocks 77 are slidably connected in the moving groove 75. A second electric push rod 76 is installed on the moving block 77, and the telescopic end of the second electric push rod 76 is installed on a third motor 78.

[0048] The second electric push rod 76 can independently adjust the feed height of the drill bit 79 to accommodate plywood of different thicknesses, and the two drill bits 79 can be adjusted independently.

[0049] In this embodiment, a second motor 73 is installed on one side of the control box 71. A bidirectional screw 74 is installed on the output shaft of the second motor 73, and the bidirectional screw 74 is rotatably connected in the groove 72. Two moving blocks 77 are respectively threaded to the two ends of the bidirectional screw 74.

[0050] The second motor 73 drives the bidirectional screw 74 to rotate, causing the two moving blocks 77 to slide towards or away from each other along the moving groove 75, thereby changing the distance between the two drilling components to meet different hole spacing processing requirements.

[0051] In this embodiment, the moving component 8 includes two first supports 81, two second supports 82, a second one-way screw 86, and a guide rod 83. The bottom ends of the two first supports 81 and the two second supports 82 are fixedly connected to the base 1. The two ends of the second one-way screw 86 are rotatably connected to the first supports 81 and the second supports 82, respectively. The two ends of the guide rod 83 are fixedly connected to the first supports 81 and the second supports 82, respectively. A fourth motor 85 is mounted on the second supports 82, and the output shaft of the fourth motor 85 is mounted on the second one-way screw 86 through a coupling. A moving seat 87 is threadedly connected to the second one-way screw 86. A guide block 84 is slidably connected to the guide rod 83. The two ends of the control box 71 are fixedly connected to the moving seat 87 and the guide block 84, respectively.

[0052] The fourth motor 85 drives the second unidirectional screw 86 to rotate, causing the moving seat 87 and the control box 71 to move linearly along the guide rod 83, thereby driving the entire processing part 7 to feed and realize drilling at different positions.

[0053] Working principle: The multi-layer plywood is stacked on the two moving platforms 3. The adjusting screws 62 are rotated to make the abutment plate 63 fit against the side of the plywood to complete the initial positioning. Then the first motor 51 is started, which drives the hinge rod 54 to swing through the first one-way screw 52 and the lifting block 53, driving the two moving platforms 3 to move towards each other until the abutment plate 63 clamps the plywood laterally.

[0054] Subsequently, the first electric push rod 41 retracts, pulling the lifting plate 42 down, and the linkage rod 46 drives the pressure plate 9 to move down synchronously, pressing the plywood vertically.

[0055] Subsequently, according to the preset hole spacing, the second motor 73 drives the bidirectional screw 74 to rotate, adjusting the distance between the two moving blocks 77 and the drill bit 79, and the second electric push rod 76 adjusts the drill bit 79 to an appropriate height.

[0056] The third motor 78 is started, and the drill bit 79 rotates; the fourth motor 85 drives the second one-way screw 86 to rotate, so that the entire processing component 7 is fed along the guide rod 83. The drill bit 79 drills holes in the plywood through the drilling groove 22, and completes the processing of multiple holes point by point through the moving component 8. The drill chips fall into the collection dish 43.

[0057] After processing is completed, each component is reset in sequence, and the finished product is removed.

[0058] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the 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 invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0059] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A drilling device for multi-hole processing of multi-layer plywood, characterized in that, Includes a base (1), a worktable (2), and processing components (7); The workbench (2) is fixedly connected to the middle of the base (1) by the support legs. The workbench (2) has two sets of sliding grooves (21) and two sets of drilling grooves (22). Each sliding groove (21) is slidably connected to a moving platform (3). Each moving platform (3) has a support component (6) for auxiliary support on both sides. The moving platform (3) has a lifting groove (31). A pressure plate (9) is slidably connected in the lifting groove (31). The base (1) is provided with a drive assembly (5) for moving two sets of moving platforms (3) towards each other, and the abutment assembly (6) on the moving platform (3) completes the lateral positioning and fixing of multiple plywoods. The base (1) is also provided with a lifting assembly (4) for synchronously raising and lowering multiple pressure plates (9), and the pressure plates (9) complete the vertical fixing of multiple plywoods. The processing component (7) includes two drilling components and an adjustment component, and the drilling distance between the two drilling components is adjusted by the adjustment component. The base (1) is provided with a moving component (8) for adjusting the position of the processing component (7), and the multi-point drilling of the drilling components is completed by the moving component (8).

2. The drilling equipment for multi-hole processing of multi-layer plywood according to claim 1, characterized in that, The abutment component (6) includes a fixed plate (61) fixedly connected to the side of the moving platform (3). An adjusting screw (62) is threadedly connected to the fixed plate (61). One end of the adjusting screw (62) is rotatably connected to an abutment plate (63). A guide rod (64) is fixedly connected to the abutment plate (63), and the guide rod (64) is slidably connected to the fixed plate (61).

3. The drilling equipment for multi-hole processing of multi-layer plywood according to claim 1, characterized in that, The drive assembly (5) includes a first motor (51) mounted on a base (1). The output shaft of the first motor (51) is equipped with a first one-way screw (52). The top end of the first one-way screw (52) is rotatably connected to the worktable (2). A lifting block (53) is threaded onto the first one-way screw (52). Two sets of hinge rods (54) are hinged on the lifting block (53). A hinge seat (55) is hinged to one end of the hinge rod (54) away from the lifting block (53). The hinge seat (55) is fixedly connected to the moving platform (3).

4. The drilling equipment for multi-hole processing of multi-layer plywood according to claim 3, characterized in that, The lifting assembly (4) includes a lifting plate (42), a clearance groove (44) is provided in the middle of the lifting plate (42), two sets of guide grooves (45) are provided on the lifting plate (42), a linkage rod (46) is slidably connected in each guide groove (45), two limiting plates (47) are fixedly connected on each linkage rod (46), and the limiting plates (47) are located above and below the lifting plate (42) respectively. The top end of the linkage rod (46) passes through the lifting groove (31) and is fixedly connected to the pressure plate (9). At least one first electric push rod (41) is installed on the base (1), and the telescopic end of the first electric push rod (41) is fixedly connected to the lifting plate (42).

5. A drilling device for multi-hole processing of multi-layer plywood according to claim 4, characterized in that, Two sets of collection dishes (43) are placed on the upper surface of the lifting plate (42), with the open end of the collection dish (43) located below the drilled groove (22).

6. A drilling device for multi-hole processing of multi-layer plywood according to claim 1, characterized in that, One end of the pressure plate (9) is located inside the lifting groove (31), and the other end of the pressure plate (9) is located outside the lifting groove (31).

7. A drilling device for multi-hole processing of multi-layer plywood according to claim 1, characterized in that, The drilling assembly includes a third motor (78), and the output shaft of the third motor (78) is fitted with a drill bit (79) via a coupling.

8. A drilling device for multi-hole processing of multi-layer plywood according to claim 7, characterized in that, The adjustment assembly includes a control box (71), on which a groove (72) and a moving groove (75) are provided, and the moving groove (75) is connected to the groove (72). Two moving blocks (77) are slidably connected in the moving groove (75), and a second electric push rod (76) is installed on the moving block (77), and the telescopic end of the second electric push rod (76) is installed on a third motor (78).

9. A drilling device for multi-hole processing of multi-layer plywood according to claim 8, characterized in that, A second motor (73) is installed on one side of the control box (71). A bidirectional screw (74) is installed on the output shaft of the second motor (73), and the bidirectional screw (74) is rotatably connected in the groove (72). The two moving blocks (77) are respectively threaded to the two ends of the bidirectional screw (74).

10. A drilling device for multi-hole processing of multi-layer plywood according to claim 9, characterized in that, The moving component (8) includes two first supports (81), two second supports (82), a second one-way screw (86), and a guide rod (83). The bottom ends of the two first supports (81) and the bottom ends of the two second supports (82) are fixedly connected to the base (1). The two ends of the second one-way screw (86) are rotatably connected to the first supports (81) and the second supports (82), respectively. The two ends of the guide rod (83) are fixedly connected to the first supports (81) and the second supports (82), respectively. A fourth motor (85) is installed on the second support (82), and the output shaft of the fourth motor (85) is installed on the second one-way screw (86) through a coupling. A moving seat (87) is threadedly connected to the second one-way screw (86). A guide block (84) is slidably connected to the guide rod (83). The two ends of the control box (71) are fixedly connected to the moving seat (87) and the guide block (84), respectively.