Five-axis gantry machine tool

Abstract

The application relates to a five-axis gantry machine tool, and relates to the technical field of machine tools. The machine tool comprises a machine body, a workbench, two mounting seats, a rotary table, an indexing head and a protective device. The protective device comprises two protective covers which are provided with mounting holes for the rotation shafts to pass through; two protective sheets which are arranged on the two protective covers, abut against the rotary table and are used for blocking the contact between the chips and the rotation shafts; and two supporting mechanisms which are arranged on the rotary table, are connected with the two protective covers through rotating assemblies at one end and form a gap hole for the indexing head to pass through at the other end. The two supporting mechanisms and the two protective covers can realize the cladding protection of the rotary table. When the workpiece falls, the workpiece collides with the supporting mechanism, the supporting mechanism can buffer the workpiece, the damage to the rotary table is reduced, the chips fall on the surface of the supporting mechanism, the machining precision of the machine tool is improved, and the convenience during the chip cleaning is improved.

Description

Technical Field

[0001] This application relates to the technical field of gantry machine tools, and in particular to a five-axis gantry machine tool. Background Technology

[0002] Currently, there is an increasing demand for five-axis machining and high-efficiency, high-precision machining of complex products in the automotive, aerospace, and medical fields.

[0003] To achieve five-axis machining, the existing solution is to set up a horizontally rotating rotary table on the CNC machine tool worktable, and install a vertically rotating indexing head on the rotary table as required, so that five-axis machining can be achieved through the linkage of multiple structures.

[0004] When the workpiece is clamped on the indexing head, it is easy for the workpiece to collide with the surface of the rotary table during the clamping process, which can easily damage the surface of the rotary table. At the same time, the chips generated during machining can easily enter the rotating part of the rotary table and accumulate on the rotary table, which can cause certain damage to the rotary table, reduce the machining accuracy of the machine tool, and make it difficult to clean up the chips. Summary of the Invention

[0005] To improve the machining accuracy of machine tools and facilitate the cleaning of debris, this application provides a five-axis gantry milling machine.

[0006] This application provides a five-axis gantry milling machine tool, which adopts the following technical solution:

[0007] A five-axis gantry milling machine includes a machine body, a worktable, two mounting seats disposed on the worktable, a rotary table rotatably mounted on the two mounting seats via a rotating shaft, an indexing head rotatably mounted on the rotary table, and a protective device for protecting the rotary table, the protective device comprising:

[0008] Two protective covers are detachably mounted on two mounting bases and have mounting holes for the shaft to pass through;

[0009] Two protective plates are installed on two protective covers and rest against the rotary table to prevent debris from contacting the shaft.

[0010] Two support mechanisms are set on the rotary table, and one end of them is spliced ​​together to form a clearance hole for the indexing head to pass through. The other end is rotatably connected to two protective covers through a rotating component. The two support mechanisms and the two protective covers can cover and protect the rotary table.

[0011] By adopting the above technical solution, the two protective covers are fixedly installed on the two mounting bases, and the rotating shaft passes through the mounting hole to make room. The two protective plates abut against the rotating platform and are used to prevent debris from contacting the rotating shaft. At the same time, the debris falling on the protective covers can fall downwards under the action of gravity.

[0012] Two support mechanisms are spliced ​​together at one end to form a clearance hole for the indexing head to pass through. The two support mechanisms are then fixedly installed on the rotary table, and the ends of the two support mechanisms away from the indexing head are connected to the protective cover through a rotating component. This allows the two protective covers and two support mechanisms to work together to cover and protect the rotary table, especially the surface of the rotary table near the indexing head.

[0013] When changing workpieces, the rotary table is in its initial state, with the indexing head mounted on the rotary table surface facing upwards. This ensures that when a workpiece falls from any direction, it collides with the support mechanism. The support mechanism cushions the workpiece, reducing damage to the rotary table. Furthermore, debris falling onto the surface of the support mechanism is cooled by the coolant or gas used during machining and falls to the outside of the rotary table, thus improving the machining accuracy of the machine tool and making debris removal easier.

[0014] Simultaneously, the rotation of the rotary table drives the rotation of two support mechanisms. The rotation of the two support mechanisms is connected to the protective cover through a rotating assembly. Therefore, the rotation of the rotary table will not drive the protective cover to rotate, so that the mounting hole opening is always located below the rotating shaft. This reduces the risk that debris will come into contact with the rotating shaft through the mounting hole after the protective cover rotates and drives the mounting hole to rotate. Therefore, the protective effect on the rotary table is further improved, and the machining accuracy of the machine tool is further improved.

[0015] Optionally, the support mechanism includes:

[0016] The support plate rests against the rotary table and is arched. The clearance hole is formed by splicing two support plates together. The support plate and the rotary table cooperate to form a buffer cavity for buffering.

[0017] A buffer component, placed on the support plate and located within the buffer cavity, is used to buffer the forces acting on the support plate;

[0018] The positioning component is mounted on the support plate and connected to the rotary table for positioning and for limiting the position of the buffer.

[0019] By adopting the above technical solution, the buffer component is first placed on the rotary table, and the lower surface of the support plate abuts against the rotary table, forming a buffer cavity between the support plate and the rotary table, so that the buffer component is located in the buffer cavity for limiting. At the same time, one end of the two support plates abuts against each other to form a clearance hole, which allows the indexing head to pass through. The other end of the two support plates is rotatably connected to the protective cover through a rotating assembly. Finally, the support plates are positioned by the positioning assembly, thereby realizing the installation of the support mechanism.

[0020] The arched support plate provides better cushioning and facilitates chip removal. The design of the buffer component maximizes the contact area between its bottom and the rotary table surface, and its top and the support plate, thereby increasing the stress area and further improving the support plate's cushioning effect. This also reduces damage to the rotary table surface, improves the machine tool's machining accuracy, and enhances the ease of chip removal.

[0021] Optionally, the positioning component includes:

[0022] Two positioning plates are set on the support plate and located on both sides of the rotary table;

[0023] Two positioning plates are set on positioning plate one by positioning screws and are positioned against the side wall of the rotary table away from the support plate.

[0024] By adopting the above technical solution, the two positioning plates can be positioned against the opposite side walls of the rotary table. Then, the two positioning plates are fixedly installed on the two positioning plates by positioning screws. The two positioning plates are positioned against the side wall of the rotary table away from the support plate, thereby fixing the support plate.

[0025] Optionally, the buffer includes:

[0026] The base plate rests against the rotary table;

[0027] An arc-shaped plate is set on the base plate and is arc-shaped, forming a receiving cavity between the base plate and the base plate. The arc-shaped plate is elastic and fits tightly against the support plate for support and cushioning.

[0028] An airbag is placed inside the containment cavity and is used for cushioning.

[0029] By adopting the above technical solution, the base plate and the arc plate are adapted to the surface of the rotary table and the lower surface of the support plate, respectively, which increases the contact area between them and the rotary table and the support plate. The airbag can buffer the impact force, thereby improving the buffering effect.

[0030] Optionally, the two support plates are connected to each other near the indexing head via a connecting assembly, the connecting assembly comprising:

[0031] A connecting screw passes through two support plates in sequence and is threadedly connected to nuts that abut against the support plates for fixation; the two support plates are provided with arc-shaped connecting grooves;

[0032] Two rotating semi-rings are respectively rotatably mounted on two connecting grooves and spliced ​​together to press against the indexing head for positioning and to prevent debris from moving to the rotating connection between the indexing head and the rotary table. The rotation of the indexing head drives the two rotating semi-rings to rotate on the two connecting grooves.

[0033] By adopting the above technical solution, the connecting screw passes through the two support plates and is fixed by nuts, thereby fixing the two support plates together at one end, which improves the stability of the protective device during operation and enhances the protective effect on the rotary table.

[0034] Meanwhile, the two rotating half-rings abut against each other and press against the indexing head for positioning. The rotation of the indexing head drives the two rotating half-rings to rotate. The two rotating half-rings can prevent debris from entering the connection between the indexing head and the rotary table, thereby reducing the risk of damage to the indexing head. At the same time, the design of the two rotating half-rings can reduce the wear between the indexing head and the rotating half-rings when the indexing head rotates, further improving the blocking effect on debris and improving the machining accuracy of the machine tool.

[0035] Optionally, the rotating half-ring is provided with a sealing ring that presses against the indexing head for sealing.

[0036] By adopting the above technical solution, the sealing ring further improves the blocking effect on debris.

[0037] Optionally, a replacement head can be detachably installed on one end of the two support plates near the indexing head, and the connecting groove is formed on the replacement head.

[0038] By adopting the above technical solution, the size of the indexing head will be different. Therefore, it is possible to install a replacement head with a rotating half ring of different sizes as needed, so that the size of the rotating half ring is adapted to the size of the indexing head. This can block the chips during the processing of indexing heads of different sizes, thereby further improving the processing accuracy of the machine tool.

[0039] Optionally, the rotating assembly includes:

[0040] The curved slide is installed on the protective cover and is curved so that its axis coincides with the axis of rotation.

[0041] The connecting body is mounted on the support plate and rotatably installed on the arc-shaped slide.

[0042] By adopting the above technical solution, the support plate rotates to drive the connecting body to rotate in the arc-shaped slide. At the same time, the setting of the connecting body can further prevent debris from entering the gap between the mounting base and the rotary table and contacting the rotating shaft, reducing the risk of damage to the rotating shaft and improving the machining accuracy of the machine tool.

[0043] Optionally, the support plate and the connecting body are connected by an elastic buffer assembly, which is used to buffer the applied force under the action of elasticity.

[0044] By adopting the above technical solution, the connection between the support plate and the connecting body is in a bent state, which is inconvenient for direct connection. If this connection is made far away from the rotary table, the strength is insufficient, making it easy to be damaged when subjected to impact, thus reducing the protection effect on the rotary table. By connecting with an elastic buffer component, the elastic force can buffer the impact, thereby further improving the protection effect on the rotary table and improving the machining accuracy of the machine tool.

[0045] Optionally, the resilient buffer component includes:

[0046] Buffer plate one is rotatably mounted on the support plate;

[0047] The movable block is tilted and slidably mounted on the connecting body and located above the buffer plate.

[0048] Buffer plate two is rotatably mounted on the movable block and rotatably connected to buffer plate one;

[0049] The elastic sheet is set on the support plate and the connecting body, and under the action of elastic force, it abuts against the side wall of buffer plate one and buffer plate two near the rotary table for positioning.

[0050] By adopting the above technical solution, when buffer plate one and buffer plate two are subjected to impact force, they are pushed to rotate. The rotation of buffer plate two pulls the moving block to move and make way. The elastic sheet buffers the impact force of buffer plate one and buffer plate two. At the same time, when the inclined moving block moves, it will decompose the force into forces in the horizontal and vertical directions, thereby further reducing the force on buffer plate one and buffer plate two, thus improving the buffering effect of impact force, improving the protection effect of rotary table, and improving the machining accuracy of machine tool.

[0051] In summary, this application includes at least one of the following beneficial technical effects:

[0052] 1. When changing workpieces, the workpieces will collide with the support mechanism regardless of where they fall from. The support mechanism can buffer the workpieces, reducing damage to the rotary table. Moreover, the debris falling onto the surface of the support mechanism can fall to the outside of the rotary table under the action of the coolant or gas used for cooling during machine tool processing, thereby improving the machining accuracy of the machine tool and the convenience of debris cleaning.

[0053] 2. The rotation of the rotary table does not drive the protective cover to rotate, ensuring that the mounting hole opening remains below the shaft. This reduces the risk of debris coming into contact with the shaft through the mounting hole after the protective cover rotates, thus further improving the protection of the rotary table and the machining accuracy of the machine tool.

[0054] 3. The arched shape of the support plate provides better cushioning and facilitates the falling of debris. At the same time, the design of the buffer component increases the contact area between the bottom of the buffer component and the rotary table surface, and the top of the buffer component and the support plate, thereby increasing the force-bearing area and further improving the support and cushioning effect of the support plate. It also reduces damage to the rotary table surface, improves the machining accuracy of the machine tool, and improves the convenience of debris cleaning. Attached Figure Description

[0055] Figure 1 It is a three-dimensional structural diagram of the machine tool;

[0056] Figure 2 This is a structural diagram of the worktable, mounting base, indexing head, rotary table, and protective device in a machine tool;

[0057] Figure 3 This is a schematic diagram of a partial structure of the machine tool;

[0058] Figure 4 yes Figure 3 Enlarged diagram of section A in the middle;

[0059] Figure 5 yes Figure 3 Enlarged diagram of section B;

[0060] Figure 6 yes Figure 3 Enlarged schematic diagram of section C.

[0061] Reference numerals: 1. Machine body; 11. Worktable; 12. Mounting base; 13. Indexing head; 2. Rotary table; 21. Mounting section; 22. Connecting section; 23. Rotating shaft; 24. Mounting hole; 25. Connecting arc surface; 3. Protective device; 31. Protective cover; 32. Protective plate; 4. Support mechanism; 41. Support plate; 42. Buffer chamber; 43. Changing head; 5. Buffer component; 51. Base plate; 52. Arc plate; 53. Air... 54. Receiving cavity; 6. Positioning assembly; 61. Positioning plate one; 62. Positioning plate two; 7. Connecting assembly; 71. Connecting screw; 72. Rotating half ring; 73. Connecting plate; 8. Rotating assembly; 81. Arc-shaped slide; 82. Connecting body; 83. Arc part; 84. Vertical part; 85. Buffer hole; 9. Elastic buffer assembly; 91. Buffer plate one; 92. Moving block; 93. Buffer plate two; 94. Elastic sheet. Detailed Implementation

[0062] The following provides a further detailed description of this application.

[0063] This application discloses a five-axis gantry milling machine.

[0064] Reference Figures 1-3The five-axis gantry milling machine includes a machine body 1, a worktable 11 mounted on the machine body 1, two mounting seats 12 mounted on the worktable 11, a rotary table 2 rotatably mounted on the two mounting seats 12 via a rotating shaft 23, an indexing head 13 rotatably mounted on the rotary table 2, and a protective device 3 for protecting the rotary table 2.

[0065] The worktable 11 can move in two mutually perpendicular directions in the horizontal plane, namely the X and Y directions. The drive structure is a motor screw nut structure. The worktable 11 has a T-shaped mounting groove for the mounting base 12 to be fixedly installed. This structure is existing technology and will not be described in detail here. An elastic protective pad can be placed on the worktable 11 to reduce the damage caused by the workpiece to the worktable 11 and to prevent debris from entering the mounting groove of the worktable 11, thereby facilitating the cleaning of debris. Two mounting bases 12 are fixedly installed on the worktable 11 at intervals along the length of the worktable 11 and are in a vertical state.

[0066] Reference Figures 2-3 The rotary table 2 includes a horizontal mounting section 21 and a connecting section 22 located at both ends of the mounting section 21 and extending vertically upward above the mounting section 21. The indexing head 13 is fixedly installed at the middle position of the upper surface of the mounting section 21. The rotating shaft 23 is fixedly installed on the opposite side walls of the two connecting sections 22 and is horizontal. The two rotating shafts 23 are rotatably installed on the side walls of the two mounting seats 12 on opposite sides. The top of the connecting section 22 is provided with an arc-shaped connecting arc surface 25 with the center located on the axis of the rotating shaft 23.

[0067] Reference Figures 3-4 The protective device 3 includes two protective covers 31, two protective plates 32, and two support mechanisms 4. The two protective covers 31 are correspondingly arranged with the two rotating shafts 23. The top of the protective cover 31 is arc-shaped, and the bottom of the protective cover 31 has a mounting hole 24 for the rotating shaft 23 to pass through. The protective cover 31 is fixedly installed on the side wall of the mounting base 12 near the rotary table 2, and the protective cover 31 is located between the mounting base 12 and the rotary table 2. During installation, the protective cover 31 is placed vertically downward so that the rotating shaft 23 passes through the mounting hole 24. Then, the protective cover 31 is fixedly installed on the mounting base 12 with screws, so that a gap is maintained between the protective cover 31 and the connecting section 22 for rotation. The top of the protective cover 31 extends above the connecting section 22.

[0068] Two protective plates 32 are fixedly installed on the sidewalls of the two protective covers 31 on opposite sides, and the two protective plates 32 extend above the two connecting sections 22. The protective plates 32 are arc-shaped and concentrically arranged with the connecting arc surface 25 and abut against the connecting arc surface 25 to prevent debris from contacting the rotating shaft 23. Two support mechanisms 4 are set on the mounting section 21, and one end of them is spliced ​​together to form a clearance hole for the indexing head 13 to pass through. The other end of the two support mechanisms 4 is rotatably connected to the protective cover 31 through the rotating assembly 8.

[0069] The support mechanism 4 includes a support plate 41, which is parallel to the length of the mounting section 21. The lower surface of the support plate 41 is positioned against the upper surface of the mounting section 21. The cross-section of the support plate 41 along the length of the mounting section 21 is arched. The clearance hole is formed by splicing two support plates 41 together with one end against each other. The clearance hole and the indexing head 13 have the same axis and the diameter is greater than or equal to the outer diameter of the indexing head 13.

[0070] Reference Figure 3 , Figure 5 Two support plates 41 are connected to each other at one end near the indexing head 13 via a connecting component 7. A replacement head 43 is detachably installed at one end of the support plate 41 near the indexing head 13. A support block is fixedly installed on the replacement head 43 and snapped onto the support plate 41. An arc-shaped connecting groove is opened at one end of the replacement head 43 near the indexing head 13.

[0071] Both support plates 41 are provided with connecting plates 73 extending to both sides of the mounting section 21. The connecting assembly 7 includes connecting screws 71 and two rotating half rings 72. There are two connecting screws 71 located on both sides of the mounting section 21. The connecting screws 71 pass through the two connecting plates 73 and are threadedly connected to nuts that abut against the connecting plates 73 for positioning, thereby fixing the two support plates 41.

[0072] Two rotating half-rings 72 are rotatably mounted on two connecting grooves. A rubber sealing ring is provided at the end of the rotating half-ring 72 near the indexing head 13. After the two support plates 41 are fixed, the two rotating half-rings 72 and the two sealing rings are pressed against the indexing head 13, thereby preventing debris from entering the rotating connection between the indexing head 13 and the mounting section 21, and also preventing the support block from separating from the support plate 41. The two support plates 41 can be removed to replace the replacement head 43. The replacement head 43 is provided with rotating half-rings 72 of different sizes to adapt to the indexing head 13 of different sizes.

[0073] Reference Figure 3 , Figure 6 The support mechanism 4 also includes a buffer 5 and a positioning component 6. A buffer cavity 42 is formed between the lower surface of the support plate 41 and the mounting section 21. The buffer 5 is placed on the upper surface of the mounting section 21 and located in the buffer cavity 42 for limiting. The buffer 5 buffers the force on the support plate 41.

[0074] The buffer component 5 includes a base plate 51, an arc-shaped plate 52, and an airbag 53. The base plate 51 is horizontal and placed on the upper surface of the mounting section 21. The arc-shaped plate 52 is fixedly mounted on the upper surface of the base plate 51 and is arc-shaped. The arc-shaped plate 52 is positioned against the lower surface of the support plate 41, forming a receiving cavity 54 between the arc-shaped plate 52 and the base plate 51. The airbag 53 is fixedly mounted in the receiving cavity 54 for cushioning. The design of the arc-shaped plate 52 and the base plate 51 not only satisfies the cushioning requirement but also increases the contact area with the mounting section 21 and the support plate 41, thereby improving the cushioning effect.

[0075] The positioning assembly 6 includes two positioning plates 61 and two positioning plates 62. The two positioning plates 61 are fixedly installed on the support plate 41 and located on both sides of the mounting section 21. The two positioning plates 61 abut against the opposite side walls of the mounting section 21 for positioning. The bottom ends of the two positioning plates 61 are flush with the lower surface of the mounting section 21. The two positioning plates 62 are fixedly installed on the bottom of the positioning plates 61 by positioning screws. The two positioning plates 62 abut against the side wall of the mounting section 21 opposite to the support plate 41, i.e., the lower surface of the mounting section 21, for positioning. The positioning screws pass vertically through the lower surface of the positioning plates 62 and are threadedly connected to the positioning plates 61.

[0076] Reference Figure 3 , Figure 4 The rotating assembly 8 includes an arc-shaped slide 81 and a connecting body 82. The arc-shaped slide 81 is fixedly installed on the side wall of the protective cover 31 near the rotary table 2 and above the protective plate 32. The arc-shaped slide 81 is arc-shaped and its center is located on the axis of the rotating shaft 23. The connecting body 82 is rotatably installed on the arc-shaped slide 81 and extends downward at an angle to near the mounting section 21. The connecting body 82 includes an arc-shaped part 83 and a vertical part 84. The arc-shaped part 83 is arc-shaped and located on the side of the protective plate 32 away from the connecting arc surface 25. The arc-shaped part 83 and the protective plate 32 are concentrically arranged. The vertical part 84 is arranged parallel to the connecting section 22.

[0077] The bottom end of the vertical part 84 is connected to the end of the support plate 41 near the vertical part 84 via an elastic buffer assembly 9. The elastic buffer assembly 9 is used to buffer the force under the action of elasticity. The elastic buffer assembly 9 includes a buffer plate 1 91, a moving block 92, a buffer plate 2 93 and an elastic sheet 94. The vertical part 84 is located above the support plate 41. The buffer plate 1 91 is rotatably mounted on the end of the support plate 41 near the vertical part 84 and is inclined upward. An inclined buffer hole 85 is opened at the bottom of the vertical part 84. The moving block 92 is slidably mounted and rotatably connected to the buffer plate 1 91. The rotation directions of the buffer plate 1 91 and the buffer plate 2 93 are parallel and horizontal.

[0078] The elastic sheet 94 is fixed at both ends by screws to the bottom of the vertical part 84 and the end of the support plate 41 near the vertical part 84. Under the action of elastic force, the elastic sheet 94 presses against the side wall of the buffer plate 1 91 and the buffer plate 2 93 near the turntable 2 for positioning. After receiving the force, the outer surfaces of the buffer plate 1 91 and the buffer plate 2 93 rotate, thereby pushing the elastic sheet 94 to rotate for buffering. At the same time, when the buffer plate 2 93 rotates, it pulls the moving block 92 to move on the buffer hole 85. Due to the tilting and sliding of the moving block 92, the force on the buffer plate 2 93 can be decomposed into two forces, horizontal and vertical, thereby reducing the force on the elastic sheet 94 and improving the buffering effect.

[0079] The working principle of this application embodiment is as follows:

[0080] Two protective covers 31 are fixedly installed on two mounting bases 12, and two rotating shafts 23 pass through two mounting holes 24. At the same time, two protective plates 32 abut against the connecting arc surface 25 to prevent debris from contacting the rotating shafts 23. The buffer 5 is placed on the mounting section 21, and two replacement heads 43 are installed on opposite ends of two support plates 41. The two replacement heads 43 are spliced ​​to form a clearance hole for the indexing head 13 to pass through. The connecting screw 71 is passed through the two connecting plates 73 and fixed with nuts, so that the two rotating half rings 72 and the sealing ring abut against the indexing head 13 for positioning. Then, the second positioning plate 62 is fixedly installed on the first positioning plate 61, so that the support plate 41 abuts against the mounting section 21 to form a buffer cavity 42 for the buffer 5 to be placed. The arc part 83 is rotated and installed on the arc slide 81, thereby completing the installation of the protective device 3.

[0081] A protective pad is placed on the worktable 11. When the machine tool is running, the workpiece is clamped on the indexing head 13 for processing. When changing the workpiece, no matter where the workpiece falls on the installation section 21, it can be buffered by the support plate 41 and the buffer 5. At the same time, when the chips fall on the support plate 41, the arched support plate 41 makes it easier for the chips to fall onto the protective pad. When the chips fall on the protective cover 31, they can also fall onto the protective pad in time, thereby improving the machining accuracy of the machine tool and the convenience of chip cleaning.

[0082] When the outer surfaces of buffer plate 1 91 and buffer plate 2 93 are subjected to force, they rotate, thereby pushing the elastic sheet 94 to rotate for buffering. At the same time, when buffer plate 2 93 rotates, it pulls the moving block 92 to move on the buffer hole 85. Due to the tilting and sliding of the moving block 92, the force on buffer plate 2 93 can be decomposed into two forces, horizontal and vertical, thereby reducing the force on the elastic sheet 94, improving the buffering effect, and improving the machining accuracy of the machine tool.

[0083] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A five-axis gantry milling machine, characterized in that: The machine includes a body (1), a worktable (11), two mounting bases (12) on the worktable (11), a rotary table (2) rotatably mounted on the two mounting bases (12) via a rotating shaft (23), and an indexing head (13) rotatably mounted on the rotary table (2). It also includes a protective device (3) for protecting the rotary table (2), the protective device (3) comprising: Two protective covers (31) are detachably mounted on two mounting bases (12) and have mounting holes (24) for the rotating shaft (23) to pass through. Two protective plates (32) are set on two protective covers (31) and abut against the rotary table (2) to prevent debris from contacting the rotating shaft (23); Two support mechanisms (4) are set on the rotary table (2) and one end is spliced ​​together to form a clearance hole for the indexing head (13) to pass through. The other end is rotatably connected to two protective covers (31) through a rotating assembly (8). The two support mechanisms (4) and the two protective covers (31) can cover and protect the rotary table (2).

2. A five-axis gantry milling machine tool according to claim 1, characterized in that: The support mechanism (4) includes: The support plate (41) rests against the rotary table (2) and is arched. The clearance hole is formed by the two support plates (41) abutting against each other and splicing together. The support plate (41) and the rotary table (2) cooperate to form a buffer cavity (42) for buffering. The buffer (5) is placed on the support plate (41) and located in the buffer cavity (42) and is used to buffer the force on the support plate (41); The positioning component (6) is set on the support plate (41) and connected to the rotary table (2) for positioning and for limiting the position of the buffer (5).

3. A five-axis gantry milling machine tool according to claim 2, characterized in that: The positioning component (6) includes: Two positioning plates (61) are set on the support plate (41) and located on both sides of the rotary table (2); Two positioning plates (62) are positioned on positioning plate (61) by positioning screws and against the side wall of the rotary table (2) away from the support plate (41).

4. A five-axis gantry milling machine tool according to claim 2, characterized in that: The buffer (5) includes: The base plate (51) rests against the rotary table (2); An arc-shaped plate (52) is set on the base plate (51) and is arc-shaped, forming a receiving cavity (54) between the base plate (51). The arc-shaped plate (52) is elastic and fits tightly against the support plate (41) for support and buffering. An airbag (53) is disposed within a receiving cavity (54) and is used for cushioning.

5. A five-axis gantry milling machine tool according to claim 2, characterized in that: The two support plates (41) are connected to each other near the indexing head (13) via a connecting assembly (7), the connecting assembly (7) comprising: A connecting screw (71) passes through two support plates (41) in sequence and is threadedly connected to a nut that abuts against the support plate (41) for fixation; the two support plates (41) are provided with arc-shaped connecting grooves; Two rotating half-rings (72) are respectively rotatably installed on two connecting grooves and spliced ​​together to press against the indexing head (13) for positioning and to prevent debris from moving to the rotating connection between the indexing head (13) and the rotary table (2). The indexing head (13) rotates to drive the two rotating half-rings (72) to rotate on the two connecting grooves.

6. A five-axis gantry milling machine according to claim 5, characterized in that: The rotating half-ring (72) is provided with a sealing ring that presses against the indexing head (13) for sealing.

7. A five-axis gantry milling machine tool according to claim 5, characterized in that: The two support plates (41) are detachably mounted with a replacement head (43) near the indexing head (13), and the connecting groove is opened on the replacement head (43).

8. A five-axis gantry milling machine according to claim 2, characterized in that: The rotating assembly (8) includes: The arc-shaped slide (81) is set on the protective cover (31) and is arc-shaped so that its axis coincides with the axis of the rotating shaft (23); The connecting body (82) is set on the support plate (41) and rotatably mounted on the arc-shaped slide (81).

9. A five-axis gantry milling machine according to claim 8, characterized in that: The support plate (41) and the connecting body (82) are connected by an elastic buffer assembly (9), which is used to buffer the force under the action of elasticity.

10. A five-axis gantry milling machine according to claim 9, characterized in that: The elastic buffer component (9) includes: Buffer plate 1 (91) is rotatably mounted on support plate (41); The movable block (92) is tilted and slidably disposed on the connector (82) and located above the buffer plate (91); Buffer plate two (93) is rotatably mounted on the movable block (92) and rotatably connected to buffer plate one (91); The elastic sheet (94) is set on the support plate (41) and the connecting body (82) and is positioned against the side wall of the buffer plate one (91) and the buffer plate two (93) near the turntable (2) under the action of elastic force.

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