C-axis rotation limiting mechanism of five-axis direct-drive swing head

Abstract

The invention discloses a five-axis direct-drive swing head C-axis rotation limiting mechanism, and relates to the technical field of direct-drive swing head C. The five-axis direct-drive swing head C-axis rotation limiting mechanism comprises a base, a workbench is fixedly connected to the upper surface of the base, two gantry stand columns are fixedly connected to the top of the base, and a horizontal moving module is fixedly connected between the two gantry stand columns. Rotation of the direct-drive swing head box can be limited by matching the two limiting plates with the limiting block, the rotation angle of the direct-drive swing head box is forcibly limited within a design threshold value, overtravel caused by out-of-control of a motor, program errors or transmission faults is avoided, tooth breakage and breakage of core components such as gears and bearings due to excessive loads are prevented, the risk of mechanical damage is reduced from the source, and the service life of the direct-drive swing head box is prolonged. In addition, the number of rotation turns can be strictly controlled through fixed limiting, breakage and short circuit caused by excessive winding, stretching or twisting of the pipeline are avoided, the operation safety is improved, and meanwhile the situation that electric control limiting fails can be avoided by limiting the direct-drive swing head box only in a mechanical mode.

Description

Technical Field

[0001] The present invention relates to the technical field of direct-drive swing head C-axis, and in particular to a five-axis direct-drive swing head C-axis rotation limiting mechanism. Background Art

[0002] As core equipment in the high-end manufacturing field, five-axis linkage machining centers can achieve one-time clamping and machining of complex curved workpieces through the coordinated movement of the three linear axes X, Y, and Z and the two rotary axes A and C. Among them, the C-axis is a key functional component rotating about the Z axis. Its rotation angle range directly determines the machining posture of the workpiece. To ensure the safety and reliability of the machining process, the C-axis must be equipped with a limit mechanism to restrict its rotation angle. For example, when machining components such as blades, small precision molds, and complex cavity molds, the C-axis of a five-axis machine tool usually only needs to rotate back and forth in a small range. However, under high-speed rotation or multi-axis linkage conditions, if the C-axis over-travels, it may cause interference and collision between the tool and the workpiece, machine column, or fixture, resulting in serious accidents such as spindle damage and workpiece scrapping. At the same time, the servo motor, encoder, and hydraulic and pneumatic pipelines connected to the C-axis are prone to entanglement, stretching, or twisting when over-rotated, resulting in signal transmission failure or power interruption, further expanding the scope of equipment damage.

[0003] However, the C-axis limit technology of existing five-axis machine tools still has significant defects. The traditional limit method mainly relies on electronic limit. The electronic limit triggers the stop command through the travel switch or encoder signal, and can monitor the rotation of the C-axis. When the C-axis rotates beyond the preset angle, it will directly control the drive device to stop driving, so that the C-axis can only rotate at the limited position. However, if there is a circuit break, program logic error or sensor failure, the electronic control system will fail, resulting in a complete loss of the limit function, which will cause the C-axis to be unable to limit. If the C-axis rotates over the travel, it will cause pulling, twisting, and entanglement of the pipelines on it, and eventually cause damage to the circuit on the C-axis of the direct-drive swing head. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a five-axis direct-drive swing head C-axis rotation limiting mechanism.

[0005] The technical solution is as follows: A five-axis direct-drive swing head C-axis rotation limiting mechanism comprises a base, the upper surface of the base is fixedly connected to a workbench, the top of the base is fixedly connected to two gantry columns, a horizontal moving module is fixedly connected between the two gantry columns, a lifting moving module is slidably connected to the horizontal moving module, a lifting frame is slidably connected to the side of the lifting moving module away from the horizontal moving module, a driving device is fixedly connected to the bottom of the lifting frame, an output shaft at the bottom of the driving device is fixedly connected to a direct-drive swing head box, the interior of the direct-drive swing head box is rotatably connected to the spindle box, and an adjustment component is provided at the bottom of the lifting frame; The limiting assembly includes two fixing rods fixedly connected to the bottom of the lifting frame by bolts. The bottoms of the two fixing rods are fixedly connected to a fixing ring, and the outer surface of the fixing ring is rotatably connected to a rotating ring.

[0006] Furthermore, the adjustment assembly also includes two spring grooves opened on the outer side of the bottom of the two fixed rods, the groove walls of the two spring grooves are fixedly connected to the first spring, the bottoms of the two first springs are commonly fixedly connected to a lifting ring, the outer surface of the lifting ring is fixedly connected to two push-pull plates, the bottom of the lifting ring is fixedly connected to a plurality of limit rods arranged in a circular array, and the top of the rotating ring is provided with a plurality of limit holes arranged in a circular array, and the plurality of limit rods are inserted into the corresponding limit holes.

[0007] Furthermore, two protrusions are fixedly connected to the inner ring surface of the lifting ring at positions corresponding to the two spring grooves. The two protrusions slide inside the two spring grooves respectively. Rubber protrusions are evenly arranged on the outer surface of the rotating ring, and the angle between each two limit sockets is ten degrees.

[0008] Furthermore, a limiting assembly is provided on the rotating ring, and the limiting assembly includes a semicircular ring fixedly connected to the outer surface of the rotating ring, and the outer surface of the semicircular ring is provided with a plurality of limiting holes arranged in a circular array. Two adjusting rings are slidably connected to the semicircular ring, and the outer surfaces of the two adjusting rings are fixedly connected with a second spring, and the ends of the two second springs away from the adjusting rings are fixedly connected to the limiting rod two, and the ends of the two adjusting rings away from each other are rotatably connected to the limiting plate, and the limiting block is fixedly connected to the direct-drive swing head box.

[0009] Furthermore, the angle between each two limit sockets 2 is five degrees, the upper and lower surfaces of the two adjustment rings are provided with rubber skin, and the two adjustment rings are provided with openings for the sliding of the limit rods 2, and the two limit rods 2 pass through the openings and are connected to two of the limit sockets 2.

[0010] Furthermore, the two limiting plates both interfere with the planes of the ends of the two adjusting rings that are away from each other, and the tops of the limiting blocks are flush with the lower surfaces of the two adjusting rings.

[0011] Furthermore, the limiting plate limits the maximum rotation angle of the limiting block to one hundred and seventy degrees.

[0012] As described above, the beneficial effects of the C-axis rotation limiting mechanism of the five-axis direct-drive swing head in the present invention are as follows: The rotation of the direct-drive swing head box can be limited by two limit plates in conjunction with the limit block, forcibly limiting the rotation angle of the direct-drive swing head box within the design threshold, avoiding overtravel caused by motor loss of control, program errors or transmission failures, and preventing core components such as gears and bearings from breaking and fracture due to excessive load, thereby reducing the risk of mechanical damage from the source. In addition, the fixed limit can strictly control the number of rotations, avoiding fracture and short circuit caused by excessive winding, stretching or twisting of pipelines, thereby improving operational safety. At the same time, limiting the direct-drive swing head box only by mechanical means can avoid failure of the electronic control limit. By adjusting the position of the two limit plates, the limit range of the limit plates can be adjusted. The adjustable design allows for flexible adjustment of the C-axis rotation stroke according to different processing requirements. It can adapt to a variety of workpiece sizes and processing technologies without replacing mechanical parts. Adjusting the limit range for specific processing tasks can reduce invalid rotation stroke and improve dynamic response speed. By rotating the adjustment component, the adjustment component can drive the entire limit component to rotate synchronously, so that the two limit plates on the limit component can limit the direct-drive swing head box at different positions through the limit blocks. The rotation angle range can be flexibly adjusted according to different processing tasks to adapt to diverse working conditions. It can be compatible with various production scenarios without replacing hardware. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional schematic diagram of the overall components of the present invention; Figure 2 It is a schematic perspective cutaway view of the overall components of the present invention; Figure 3 It is a schematic cross-sectional perspective view of the drive device, direct-drive swing head box and other components of the present invention; Figure 4 For the present invention Figure 3 A magnified schematic diagram of the component at center A; Figure 5 For the present invention Figure 2 A magnified schematic diagram of the component at point B; Figure 6 It is a three-dimensional schematic diagram of the components of the present invention, such as the limiting socket 1, the limiting rod 1, the limiting plate, and the limiting block; Figure 7 It is a three-dimensional schematic diagram of the semicircular ring, the second limiting socket, the adjusting ring and other components of the present invention; Figure 8 For the present invention Figure 7 An enlarged schematic diagram of the component at point C in the middle; Figure 9It is a three-dimensional schematic diagram of the fixed ring, lifting ring, rotating ring, adjusting ring and other components of the present invention.

[0014] Wherein, the accompanying drawings in the present invention are: 1. Base; 11. Workbench; 12. Gantry column; 13. Horizontal movement module; 14. Lifting movement module; 15. Lifting frame; 16. Drive unit; 17. Direct-drive swing head box; 18. Spindle box; Adjustment assembly: 21, fixed rod; 22, fixed ring; 23, spring slot; 24, first spring; 25, lifting ring; 26, push-pull plate; 27, limit rod 1; 28, rotating ring; 29, limit socket 1; Limiting assembly: 31. Semicircular ring; 32. Limiting socket 2; 33. Adjusting ring; 34. Second spring; 35. Limiting rod 2; 36. Limiting plate; 37. Limiting block. DETAILED DESCRIPTION

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0016] The embodiments provided by the present invention will be described in detail below: like Figures 1 to 7 and Figure 9 As shown, a five-axis direct-drive swing head C-axis rotation limit mechanism includes a base 1, the upper surface of the base 1 is fixedly connected to a workbench 11, the top of the base 1 is fixedly connected to two gantry columns 12, a horizontal moving module 13 is fixedly connected between the two gantry columns 12, a lifting moving module 14 is slidably connected to the horizontal moving module 13, a lifting frame 15 is slidably connected to the side of the lifting moving module 14 away from the horizontal moving module 13, a driving device 16 is fixedly connected to the bottom of the lifting frame 15, an output shaft at the bottom of the driving device 16 is fixedly connected to a direct-drive swing head box 17, the internal rotation of the direct-drive swing head box 17 is connected to a spindle box 18, and an adjustment component for adjusting the limit position is provided at the bottom of the lifting frame 15; It should be noted that the above are all existing structures, in which the horizontal moving module 13 can drive the lifting moving module 14 to move horizontally, the lifting moving module 14 can drive the lifting frame 15 to move upward, the driving device 16 can drive the direct-drive swing head box 17 to rotate horizontally, and the direct-drive swing head box 17 can drive the spindle box 18 to rotate vertically, that is, the spindle box 18 can be rotated and tilted, and the bottom of the spindle box 18 can be installed with drill bits, milling cutters and other processing tools.

[0017] The limiting assembly includes two fixing rods 21 fixedly connected to the bottom of the lifting frame 15 by bolts, and the bottoms of the two fixing rods 21 are commonly fixedly connected to a fixing ring 22, and the outer sides of the bottoms of the two fixing rods 21 are provided with spring grooves 23, and the groove walls of the two spring grooves 23 are fixedly connected to first springs 24, and the bottoms of the two first springs 24 are commonly fixedly connected to a lifting ring 25, and the outer surface of the lifting ring 25 is fixedly connected to two push-pull plates 26, and the bottom of the lifting ring 25 is fixedly connected to multiple limiting rods 27 arranged in a circular array, and the outer surface of the fixing ring 22 is rotatably connected to a rotating ring 28, and the top of the rotating ring 28 is provided with multiple limiting sockets 29 arranged in a circular array, and multiple limiting rods 27 are inserted into the corresponding limiting sockets 29. It should be noted that the inner ring surface of the lifting ring 25 is fixedly connected to the positions corresponding to the two spring grooves 23 with two protrusions, and the two protrusions slide inside the two spring grooves 23 respectively. The outer surface of the rotating ring 28 is evenly provided with rubber protrusions to facilitate the staff to manually rotate the rotating ring 28. The angle between each two limit sockets 29 is ten degrees, and the rotating ring 28 can be rotated and adjusted with a gap of ten degrees through the cooperation of the limit rod 27 and the limit socket 29.

[0018] Specifically, the workpiece to be processed is placed on the workbench 11. After the equipment is started, the horizontal moving module 13 drives the lifting moving module 14 to move horizontally, and the lifting moving module 14 drives the lifting frame 15 to move up and down. The lifting frame 15 drives the driving device 16 to move up and down synchronously, and the driving device 16 drives the direct-drive swing head box 17 to rotate horizontally, and the direct-drive swing head box 17 drives the spindle box 18 to rotate vertically, that is, the spindle box 18 is rotated to an inclined state. Through the above, multi-angle processing of the workpiece can be achieved.

[0019] It should be noted that the above is a brief description of the processing steps of an existing five-axis machining center.

[0020] In addition, when it is necessary to limit the horizontal rotation of the direct-drive swing head box 17, the staff determines the position of the rotation limit of the direct-drive swing head box 17, and then the staff holds the two push-pull plates 26, and then pushes the push-pull plates 26 to move upward. The two push-pull plates 26 drive the lifting ring 25 to move upward, and the protrusion of the lifting ring 25 moves upward inside the spring groove 23. The protrusion of the lifting ring 25 will compress the first spring 24 upward inside the spring groove 23. At the same time, when the lifting ring 25 moves upward, it will drive multiple limit rods 27 at its bottom to move upward at the same time. At this time, the limit rod 27 is no longer connected with the limit socket 29, and then the lifting ring 25 no longer locks the rotating ring 28 by connecting the limit rod 27 with the limit socket 29. At this time, the staff can push the rotating ring 28 to make the rotating ring 28 rotate on the fixed ring 22.

[0021] It should be noted that these are only the operating steps of the structure in the adjustment component for adjusting the limit position, and the specific effects are achieved with the components below.

[0022] When the limit position is adjusted, the staff releases the push-pull plate 26, and the lifting ring 25 moves downward under the elastic reset action of the first spring 24, wherein the protrusion of the lifting ring 25 moves downward inside the spring groove 23 to the lowest position of the spring groove 23, and at the same time, the limit plug rod 27 at the bottom of the lifting ring 25 is inserted into the interior of the limit socket 29. Because the lifting ring 25 can only slide vertically in the spring groove 23 through the protrusion, the lifting ring 25 cannot rotate. The lifting ring 25 is inserted into the interior of the limit socket 29 through the limit plug rod 27 and can lock the rotation of the rotating ring 28, so that the rotating ring 28 cannot rotate on the fixed ring 22. At this time, the adjusted limit is locked, ensuring the stability of the limit of the direct-drive swing head box 17.

[0023] To further explain, after releasing the push-pull plate 26 and causing the lifting ring 25 to move downward, the limit rod 27 does not completely overlap with the limit socket 29, and the lifting ring 25 will drive the limit rod 27 to conflict with the upper surface of the rotating ring 28. At this time, the staff is required to rotate the rotating ring 28 at a small angle again, and when the rotating ring 28 rotates, the limit socket 29 on it needs to move toward the closest limit rod 27, thereby realizing a small angle rotation. When the limit rod 27 overlaps with the limit socket 29, the limit rod 27 can be plugged and locked with the limit socket 29.

[0024] like Figures 6 to 9 As shown, a limit assembly for limiting the rotation of the direct-drive swing head box 17 is provided on the rotating ring 28, and the limit assembly includes a semicircular ring 31 fixedly connected to the outer surface of the rotating ring 28, and the outer surface of the semicircular ring 31 is provided with a plurality of limit sockets 32 arranged in a circular array, and two adjustment rings 33 are slidably connected to the semicircular ring 31, and the outer surfaces of the two adjustment rings 33 are fixedly connected with second springs 34, and the ends of the two second springs 34 away from the adjusting rings 33 are fixedly connected to the limit rod 35, and the ends of the two adjustment rings 33 away from each other are rotatably connected to the limit plate 36, and the limit block 37 is fixedly connected to the direct-drive swing head box 17.

[0025] It should be noted that the angle between each two limit sockets 32 is five degrees, which is used to adjust the arc limit range between the two limit plates 36 with a gap of five degrees. The upper and lower surfaces of the two adjustment rings 33 are provided with rubber skin, which is convenient for the staff to push and pull the adjustment rings 33. The two adjustment rings 33 are provided with openings for the sliding of the limit rods 35. The two limit rods 35 pass through the openings and are plugged into two of the limit sockets 32. The two limit plates 36 are in conflict with the planes of the ends of the two adjustment rings 33 that are away from each other, so that the limit plates 36 can only rotate to the side away from the adjustment rings 33. The top of the limit block 37 is flush with the lower surfaces of the two adjustment rings 33, and the two limit plates 36 are located on the movement path of the limit block 37.

[0026] Specifically, according to the limit position after the above adjustment, the limit plate 36 can be used to cooperate with the limit block 37 for limiting. If the limit block 37 is just located between the two limit plates 36 and the side away from the adjustment ring 33, the rotation of the direct-drive swing head box 17 will drive the limit block 37 to rotate synchronously. When the limit block 37 rotates synchronously, it will be blocked by the limit plate 36. The two limit plates 36 and the limit block 37 can be used to limit the rotation of the direct-drive swing head box 17, and the rotation angle of the direct-drive swing head box 17 can be forcibly limited within the design threshold to avoid overtravel caused by motor loss of control, program error or transmission failure, and to prevent core components such as gears and bearings from chipping and breaking due to excessive load, thereby reducing the risk of mechanical damage from the source. In addition, the fixed limit can strictly control the number of rotations to avoid breakage and short circuit of pipelines due to excessive winding, stretching or twisting, thereby improving the safety of operation. At the same time, limiting the direct-drive swing head box 17 only by mechanical means can avoid failure of the electric control limit.

[0027] When the limit block 37 is not located between the two limit plates 36 on the side away from the adjustment ring 33, the direct-drive swing head box 17 rotates to drive the limit block 37 to rotate synchronously. When the direct-drive swing head box 17 drives the limit block 37 to rotate and contacts one of the limit plates 36, it will push the limit plate 36, causing the limit plate 36 to rotate upward. After the limit block 37 passes the limit plate 36, the limit plate 36 will drop downward under the action of gravity, and the rotation of the limit block 37 can also be limited by the limit plate 36.

[0028] It should be noted that the above only limits the rotation range of the direct-drive swing head box 17 to avoid the pipeline entanglement, twisting, and pulling when the direct-drive swing head box 17 rotates at too large an angle. It has nothing to do with the normal precision processing of the main device and will not cause any impact on the precision processing of the main device.

[0029] In addition, when it is necessary to adjust the limit range of the limit block 37 of the two limit plates 36, the staff can pull the limit plug rod 2 35 so that the limit plug rod 2 35 slides outward in the opening of the adjustment ring 33. The limit plug rod 2 35 will stretch the second spring 34. At this time, the limit plug rod 2 35 is no longer connected with the limit plug hole 2 32. Then the staff pushes and pulls the adjusting ring 33 so that the adjusting ring 33 slides in an arc on the semicircular ring 31. The adjusting ring 33 will drive the limit plate 36 to move synchronously, thereby adjusting the position of the limit plate 36, and thus adjusting the limit range of the limit plate 36. The adjustable design allows the C-axis rotation stroke to be flexibly adjusted according to different processing requirements. It can adapt to a variety of workpiece sizes and processing processes without replacing mechanical parts. Adjusting the limit range for specific processing tasks can reduce invalid rotation stroke and improve dynamic response speed.

[0030] When the position of the limit plate 36 is adjusted, the staff then loosens the limit rod 35, and the limit rod 35 slides inwardly in the opening of the adjustment ring 33 under the action of the elastic contraction of the second spring 34. If the limit rod 35 is just located at the limit hole 32 in the overlapping position, the limit rod 35 will be inserted into the interior of the limit hole 32 again, thereby locking the position of the adjustment ring 33. If the limit rod 35 is not in the overlapping position with the limit hole 32, the limit rod 35 will be inserted into the interior of the limit hole 32 again, thereby locking the position of the adjustment ring 33. The second limiting rod 35 will come into contact with the outer surface of the semicircular ring 31, and then push and pull the adjusting ring 33, so that the adjusting ring 33 can slide further on the semicircular ring 31. Then the adjusting ring 33 will drive the second limiting rod 35 to slide on the outer surface of the semicircular ring 31 through the opening. When the second limiting rod 35 moves to a position that coincides with the second limiting hole 32, the second spring 34 will continue to drive the second limiting rod 35 to be inserted into the interior of the second limiting hole 32 under the elastic reset action of the second spring, thereby also being able to lock the adjusting ring 33.

[0031] It should be noted that the two limiting plates 36 limit the maximum rotation angle of the limiting block 37 to one hundred and seventy degrees, that is, the two limiting plates 36 can be adjusted between one hundred and seventy degrees and zero degrees.

[0032] In addition, according to the rotation of the adjustment component, the adjustment component can drive the entire limit component to rotate synchronously, so that the two limit plates 36 on the limit component can limit the direct-drive swing head box 17 at different positions through the limit blocks. The rotation angle range can be flexibly adjusted according to different processing tasks to adapt to diverse working conditions. It can be compatible with various production scenarios without replacing hardware.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A five-axis direct-drive swing head C-axis rotation limiting mechanism, comprising a base (1), the upper surface of the base (1) is fixedly connected to a workbench (11), the top of the base (1) is fixedly connected to two gantry columns (12), a horizontal moving module (13) is fixedly connected between the two gantry columns (12), a lifting moving module (14) is slidably connected to the horizontal moving module (13), a lifting frame (15) is slidably connected to the side of the lifting moving module (14) away from the horizontal moving module (13), a driving device (16) is fixedly connected to the bottom of the lifting frame (15), an output shaft at the bottom of the driving device (16) is fixedly connected to a direct-drive swing head box (17), and the interior of the direct-drive swing head box (17) is rotatably connected to a spindle box (18), characterized in that An adjustment component is provided at the bottom of the lifting frame (15); The limiting assembly includes two fixing rods (21) fixedly connected to the bottom of the lifting frame (15) by bolts, the bottoms of the two fixing rods (21) are fixedly connected to a fixing ring (22), and the outer surface of the fixing ring (22) is rotatably connected to a rotating ring (28).

2. The five-axis direct-drive swing head C-axis rotation limiting mechanism according to claim 1 is characterized in that: The adjustment component also includes two spring grooves (23) provided on the outer sides of the bottoms of the two fixed rods (21), the groove walls of the two spring grooves (23) are fixedly connected to the first springs (24), the bottoms of the two first springs (24) are fixedly connected to a lifting ring (25), the outer surface of the lifting ring (25) is fixedly connected to two push-pull plates (26), the bottom of the lifting ring (25) is fixedly connected to a plurality of limiting plug rods (27) arranged in a circular array, the top of the rotating ring (28) is provided with a plurality of limiting plug holes (29) arranged in a circular array, and the plurality of limiting plug rods (27) are inserted into the corresponding limiting plug holes (29).

3. The five-axis direct-drive swing head C-axis rotation limiting mechanism according to claim 1, characterized in that: The inner surface of the lifting ring (25) is fixedly connected to the positions corresponding to the two spring grooves (23) with two protrusions, and the two protrusions slide inside the two spring grooves (23) respectively. The outer surface of the rotating ring (28) is evenly provided with rubber protrusions, and the angle between each two limit sockets (29) is ten degrees.

4. The five-axis direct-drive swing head C-axis rotation limiting mechanism according to claim 1, characterized in that: A limit assembly is provided on the rotating ring (28), and the limit assembly includes a semicircular ring (31) fixedly connected to the outer surface of the rotating ring (28), the outer surface of the semicircular ring (31) is provided with a plurality of limit jacks (32) arranged in a circular array, two adjusting rings (33) are slidably connected to the semicircular ring (31), the outer surfaces of the two adjusting rings (33) are fixedly connected to the second spring (34), the ends of the two second springs (34) away from the adjusting ring (33) are fixedly connected to the limit rod (35), the ends of the two adjusting rings (33) away from each other are rotatably connected to the limit plate (36), and the limit block (37) is fixedly connected to the direct drive swing head box (17).

5. The five-axis direct-drive swing head C-axis rotation limiting mechanism according to claim 4, characterized in that: The angle between each two limiting jacks (32) is five degrees. The upper and lower surfaces of the two adjustment rings (33) are provided with rubber skins. The two adjustment rings (33) are provided with openings for the limiting rods (35) to slide. The two limiting rods (35) pass through the openings and are plugged into two of the limiting jacks (32).

6. The five-axis direct-drive swing head C-axis rotation limiting mechanism according to claim 4, characterized in that: The two limiting plates (36) both contact the planes of the ends of the two adjusting rings (33) that are away from each other, and the top of the limiting block (37) is flush with the lower surfaces of the two adjusting rings (33).

7. The five-axis direct-drive swing head C-axis rotation limiting mechanism according to claim 4, characterized in that: The maximum rotation angle of the limiting plate (36) to the limiting block (37) is limited to one hundred and seventy degrees.

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