Large thin-walled cylinder section end face machining system

Abstract

The invention relates to the technical field of cylinder section machining, in particular to a large thin-wall cylinder section end face machining system. An axial moving sliding table is slidably installed on a base and moves in the direction of the central axis of a cylinder section; the annular drag chain assembly is vertically installed on the main body frame and used for supporting and guiding cables and pipelines of the machining units and achieving annular movement. The inner shape maintaining clamping plate is installed on the main body frame and used for rigidly supporting the inner surface of the large thin-wall cylinder section. The machining unit is slidably mounted on the outer annular guide rail and the inner annular guide rail through the annular moving sliding plate, and the annular transmission system is used for driving the machining unit to do circular motion along the outer annular guide rail and the inner annular guide rail so as to machine the surface and the end face of the large thin-wall cylinder section. The large thin-walled cylinder section end face machining system aims at solving the problems that a large thin-walled cylinder section is poor in machining consistency, low in machining efficiency, poor in machining precision and low in surface smoothness.

Description

Technical Field

[0001] This invention relates to the field of cylinder segment processing technology, and specifically to a large thin-walled cylinder segment end face processing system. Background Technology

[0002] In the fields of aviation, aerospace, and new energy, a large number of complex-shaped cylindrical sections are used. These sections are typically characterized by large structural dimensions, low rigidity, and complex and varied shapes. To reduce weight and increase volume, thin-walled structures are often adopted, resulting in low rigidity for these large thin-walled sections. In most cases, a certain machining allowance must be reserved at the joints of large thin-walled sections, requiring finishing in subsequent processes. During positioning, thin-walled sections are easily deformed by gravity and clamping forces, altering their external dimensions. This significantly affects the machining accuracy of the end face and adjacent areas of large thin-walled sections, necessitating high-precision rigid clamping followed by end face finishing. Through comparison and analysis of existing products in the market, existing end face machining solutions include manual cutting with scribing fixtures and cutting with a single set of annular guide rails carrying a cutting saw blade. Manual cutting and grinding are inefficient and result in low end-face processing accuracy. The circular guide rail carrying the saw blade results in low end-face cutting accuracy, high noise, poor surface roughness, and ultimately requires manual grinding of the end face.

[0003] Existing similar equipment and technical solutions suffer from poor stability, low processing consistency, poor equipment rigidity and low precision, low end face processing efficiency, inability to perform milling operations, and inability to process complex cylindrical sections.

[0004] The main reasons for these problems are: 1. Large cylinder sections have large diameters, and the equipment used for processing with traditional processing equipment would be extremely large. Due to cost constraints, such equipment is rarely used. Instead, manual tooling is used. Because the cylinder sections are large, workers need to climb to heights frequently, which is inefficient, time-consuming, and has poor precision. 2. The processing method using a single set of ring guide rail band saw blades is not a precision machining method. The saw blade rotation itself has a large runout, and the machining accuracy and roughness of the cylinder end face cannot be guaranteed. In addition, the noise is relatively large. 3. The rigidity of a single set of circular guide rails is relatively weak. Even with the addition of auxiliary follower wheels, the rigidity is not significantly enhanced. The saw blade itself is prone to deformation and wear under stress, resulting in uncontrollable cutting accuracy and poor flatness. 4. Thin-walled large cylindrical sections have weak rigidity. Whether it is manual cutting or automatic cutting with a saw blade, the product is cut from the surface of the cylindrical section. Since the thin-walled large cylindrical section itself has weak rigidity, the product itself vibrates more significantly when cut from the surface, which affects the cutting accuracy.

[0005] Therefore, the inventors have provided a system for machining the end faces of large thin-walled cylindrical sections. Summary of the Invention

[0006] (1) Technical problems to be solved This invention provides a large thin-walled cylinder end face processing system, which solves the technical problems of poor processing consistency, low processing efficiency, poor processing accuracy and low surface finish of large thin-walled cylinders.

[0007] (2) Technical solution This invention provides a large thin-walled cylinder end face machining system, including a base, an axial moving slide, a main frame, an annular drag chain assembly, an inner retaining plate, an annular transmission system, an outer annular guide rail, an inner annular guide rail, a machining unit, an annular moving slide plate, and a zero-point positioning device; wherein, The axial moving slide is slidably mounted on the base and moves along the central axis of the cylinder section. The main frame is fixedly mounted on the axial moving slide. The annular drag chain assembly, the inner retaining plate, the annular transmission system, the outer annular guide rail, and the inner annular guide rail are all mounted on the main frame. The annular drag chain assembly is vertically mounted on the first end face of the main frame and is used to support and guide the cables and pipes of the processing unit and realize annular movement. The inner retaining plate is mounted on the first end face of the main frame and is used to rigidly support the inner surface of the large thin-walled cylinder section. The processing unit is docked with the annular moving slide plate through the zero-point positioning device. The processing unit is slidably mounted on the outer annular guide rail and the inner annular guide rail through the annular moving slide plate. The annular transmission system is used to drive the processing unit to make circumferential movements along the outer annular guide rail and the inner annular guide rail to realize the surface and end face processing of the large thin-walled cylinder section.

[0008] Furthermore, the annular cable chain assembly includes an inner ring guide plate, an outer ring guide plate, a bidirectional curved annular cable chain, a moving guide unit, a front baffle, and a rear baffle. The inner ring guide plate, the outer ring guide plate, the rear baffle, and the front baffle are sequentially assembled onto the first end face of the main frame. The outer ring guide plate, the rear baffle, and the front baffle are sequentially connected by right-angle feet to form an annular cable chain guide groove. The bidirectional curved annular cable chain is installed in the annular cable chain guide groove. The two ends of the moving guide unit are respectively connected to the moving end of the bidirectional curved annular cable chain and the processing unit, and are used to drive the bidirectional curved annular cable chain to move radially.

[0009] Furthermore, the front baffle has a ring-shaped structure, comprising multiple arc-shaped baffles that are sequentially spliced ​​together.

[0010] Furthermore, the plurality of rear baffles are distributed sequentially at intervals along the circumference of the front baffle.

[0011] Furthermore, the inner-protection type card plate has a ring structure, including multiple inner-protection type card plate units sequentially spliced ​​along the circumference. Each inner-protection type card plate unit includes a card plate base plate, a card plate self-locking drive mechanism, a card plate base plate guide rail, and a card plate limiter. The card plate self-locking drive mechanism, the card plate base plate guide rail, and the card plate limiter are all disposed and installed in the ring transmission system. The card plate base plate is slidably installed on the card plate base plate guide rail. The card plate self-locking drive mechanism is used to drive the card plate base plate to move radially, and the card plate limiter is used to realize the radial limitation of the card plate base plate.

[0012] Furthermore, the two guide rails of the card plate substrate are respectively located at both ends of the card plate substrate.

[0013] Furthermore, the ring transmission system includes multiple ring transmission units sequentially spliced ​​along the circumference. Each ring transmission unit includes a base plate, a single-segment arc toothed ring, a base, an adjusting block, a tightening screw, a first end-jump adjusting screw, a second end-jump adjusting screw, and a positioning pin. The base plate is mounted on the base and is radially adjusted by the adjusting block and the tightening screw distributed on the inner and outer sides. The first end-jump adjusting screw is mounted on the base plate and is used to push the base plate outward. The second end-jump adjusting screw is mounted on the base plate and is used to lock the base plate to the base. The outer annular guide rail and the inner annular guide rail are respectively installed on the outer and inner sides of the substrate. The single-segment arc tooth ring is installed on the substrate and located between the outer annular guide rail and the inner annular guide rail. The annular moving slide plate is connected to the single-segment arc tooth ring and moves synchronously.

[0014] Furthermore, one end of the card plate self-locking drive mechanism is fixed to the base, and the moving end of the card plate self-locking drive mechanism is connected to the card plate base plate; the card plate base plate guide rail and the card plate limiter are both installed on the base.

[0015] Furthermore, the large thin-walled cylindrical section end face processing system also includes positioning pins, and the substrate is fixedly installed on the base by the positioning pins.

[0016] Furthermore, the machining unit includes a radial moving component, an axial micro-feed component, and a spindle component, wherein the radial moving component and the axial micro-feed component are both mounted on the spindle component.

[0017] (3) Beneficial effects In summary, this invention enables milling and chamfering of the end faces of large cylindrical sections by having the processing unit move circumferentially along the annular guide rail. Simultaneously, an internal retaining plate provides rigid support for the large cylindrical section, eliminating the need for clamping devices on its outer surface. The entire circumference of the section can be processed, covering all circumferential end faces and allowing for milling operations even when suspended above the outer surface, resulting in high coverage. Furthermore, the equipment boasts excellent overall rigidity, enabling rapid repositioning and milling operations, leading to high processing efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural front view of a large thin-walled cylinder end face processing system provided in an embodiment of the present invention; Figure 2 This is a right view of the structure of a large thin-walled cylinder end face processing system provided in an embodiment of the present invention; Figure 3 This is a partial structural schematic diagram of a large thin-walled cylinder end face processing system provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of an annular drag chain assembly of a large thin-walled cylindrical section end face processing system provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal retaining plate structure of a large thin-walled cylinder end face processing system provided in an embodiment of the present invention; Figure 6 yes Figure 5 Enlarged view of the structure at point A in the image; Figure 7 This is a schematic diagram of the structure of a conventional annular system for a large thin-walled cylindrical section end face processing system provided in an embodiment of the present invention; Figure 8 yes Figure 7 Enlarged view of the structure at point B in the image; Figure 9 yes Figure 7 The CC section view in the middle; Figure 10 yes Figure 7 DD section view in the diagram.

[0020] In the picture: 1-Base; 2-Axial moving slide; 3-Main frame; 4-Annular cable chain assembly; 401-Inner ring guide plate; 402-Outer ring guide plate; 403-Bidirectional bending annular cable chain; 404-Moving guide unit; 405-Front baffle; 406-Rear baffle; 5-Inner retaining type clamping plate; 501-Inner retaining type clamping plate unit; 5011-Clamping plate base plate; 5012-Clamping plate self-locking drive mechanism; 5013-Clamping plate base plate guide rail; 5014-Clamping plate hard limiter; 6-Annular transmission system; 601-Annular transmission... Moving unit; 6011-Base plate; 6012-Single-segment arc gear ring; 6013-Base; 6014-Adjusting block; 6015-Tightening screw; 6016-First end jump adjustment screw; 6017-Second end jump adjustment screw; 6018-Positioning pin; 7-Outer annular guide rail; 8-Inner annular guide rail; 9-Radial moving component; 10-Axial micro-motion feed component; 11-Main spindle component; 12-Annular moving slide plate; 13-Zero point positioning device; 14-Pulley; 15-Annular motor; 16-Annular reducer. Detailed Implementation

[0021] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention. That is, the present invention is not limited to the described embodiments, and any modifications, substitutions and improvements to the parts, components and connection methods are covered without departing from the spirit of the present invention.

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to 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.

[0024] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "install" 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 direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] This invention provides a large thin-walled cylinder end face processing system, see [link / reference]. Figures 1-3 The processing system may include a base 1, an axial moving slide 2, a main frame 3, an annular drag chain assembly 4, an inner retaining plate 5, an annular transmission system 6, an outer annular guide rail 7, an inner annular guide rail 8, a processing unit, an annular moving slide plate 12, and a zero-point positioning device 13. The axial moving slide 2 is slidably mounted on the base 1 and moves along the central axis of the cylinder section. The main frame 3 is fixedly mounted on the axial moving slide 2. The annular drag chain assembly 4, the inner retaining plate 5, the annular transmission system 6, the outer annular guide rail 7, and the inner annular guide rail 8 are all mounted on the main frame 3. The annular drag chain assembly 4 is vertically mounted on the first end face of the main frame 3 and is used to support and guide the cables and pipes of the processing unit and realize annular movement. The inner retaining plate 5 is mounted on the first end face of the main frame 3 and is used to rigidly support the inner surface of the large thin-walled cylinder section. The processing unit is connected to the annular moving slide plate 12 through the zero-point positioning device 13. The processing unit is slidably mounted on the outer annular guide rail 7 and the inner annular guide rail 8 through the annular moving slide plate 12. The annular transmission system 6 is used to drive the processing unit to make circumferential movements along the outer annular guide rail 7 and the inner annular guide rail 8 to realize the surface and end face processing of the large thin-walled cylinder section.

[0026] In the above embodiments, the base 1 can be supported by pads and directly fixed to the prefabricated foundation, or the bed can be arranged below it. The base 1 can move in a direction parallel to the horizontal plane and perpendicular to the center line of the large thin-walled cylinder section, facilitating the mounting and dismounting of the large thin-walled cylinder section. The axial moving slide 2 can move on the base 1 in the direction of the center line (i.e., axis) of the large thin-walled cylinder section, and supports the main frame 3 on it. The main frame 3 is fixed on the axial moving slide 2. The main frame 3 is the basic component for mounting the annular drag chain assembly 4, the inner retaining plate 5, the annular transmission system 6, the outer annular guide rail 7, and the inner annular guide rail 8. The annular cable chain assembly 4 supports and guides the cables and pipes of the processing unit, and can achieve annular motion greater than 400°. The processing unit consists of a radial moving component 9, an axial micro-feed component 10, and a spindle component 11. The inner retaining plate 5 extends into the inner side of the large thin-walled cylinder section and provides rigid support to the inner surface of the cylinder section, improving the rigidity during cylinder section processing. The annular transmission system 6 controls the processing unit, realizing circumferential, radial, and axial servo control and spindle processing. The processing unit docks with the zero-point positioning device 13 on the annular moving slide plate 12 via a pull stud 14. This processing system can perform in-situ hole drilling and milling on the outer curved surface of the large thin-walled cylinder section, or mill the entire end face of the large thin-walled cylinder section.

[0027] Specifically, both the outer ring guide rail 7 and the inner ring guide rail 8 are segmented structures, including multiple single-segment outer arc guide rails and single-segment inner arc guide rails connected in sequence.

[0028] As an optional implementation method, such as Figure 4 As shown, the annular cable chain assembly 4 includes an inner ring guide plate 401, an outer ring guide plate 402, a bidirectional curved annular cable chain 403, a moving guide unit 404, a front baffle 405, and a rear baffle 406. The inner ring guide plate 401, outer ring guide plate 402, rear baffle 406, and front baffle 405 are sequentially assembled onto the first end face of the main frame 3. The outer ring guide plate 402, rear baffle 406, and front baffle 405 are sequentially connected by right-angle feet to form an annular cable chain guide groove. The bidirectional curved annular cable chain 403 is installed in the annular cable chain guide groove. The two ends of the moving guide unit 404 are respectively connected to the moving end of the bidirectional curved annular cable chain 403 and the processing unit, and are used to drive the bidirectional curved annular cable chain 403 to move radially.

[0029] In the above embodiment, since the annular cable chain assembly 4 is installed vertically, under the action of gravity, the bidirectional curved annular cable chain 403 will adhere to the lower end face of the annular cable chain guide groove. The moving guide unit 404 is installed on the processing unit, and the other end is fixed to the moving end of the bidirectional curved annular cable chain 403. The moving guide unit 404 can push away the drooping cable chain without damaging the cable chain, realizing single-turn and multi-turn movement.

[0030] As an optional implementation method, such as Figure 4 As shown, the front baffle 405 has a ring-shaped structure, comprising multiple arc-shaped baffles sequentially spliced ​​together. Multiple rear baffles 406 are distributed sequentially at intervals along the circumference of the front baffle 405.

[0031] As an optional implementation method, such as Figures 5-6 As shown, the inner-protection type card 5 has a ring-shaped structure, including multiple inner-protection type card units 501 sequentially spliced ​​along the circumference. Each inner-protection type card unit 501 includes a card base plate 5011, a card self-locking drive mechanism 5012, a card base plate guide rail 5013, and a card limiter 5014. The card self-locking drive mechanism 5012, card base plate guide rail 5013, and card limiter 5014 are all mounted on the ring transmission system 6. The card base plate 5011 is slidably mounted on the card base plate guide rail 5013. The card self-locking drive mechanism 5012 drives the card base plate 5011 to move radially, and the card limiter 5014 limits the radial movement of the card base plate 5011. Furthermore, two card base plate guide rails 5013 are located at opposite ends of the card base plate 5011.

[0032] Specifically, see Figure 6The pallet base plate 5011 is mounted on two pallet base plate guide rails 5013, which guides the pallet base plate 5011 from the center outward. One end of the pallet self-locking drive mechanism 5012 is fixed to the protruding part of the base 6013, and the moving end is fixed to the pallet base plate 5011. By manually rotating the pallet self-locking drive mechanism 5012, the entire inner-protection pallet unit 501 can be moved radially, completing the local support of the inner side of the large thin-walled cylinder section. Multiple inner-protection pallet units 501 complete the overall support of the inner side of the large thin-walled cylinder section. The pallet limiter 5014 can limit the radial movement position of the inner-protection pallet unit 501 to avoid overtravel operation. The equipment provides rigid support for large thin-walled cylindrical sections. There are no clamping devices on the outer surface of the cylindrical sections, and the entire circumference of the cylindrical sections can be machined. Not only can all circumferential end faces be covered for machining, but it can also be extended to the outer surface of large cylindrical sections for milling, resulting in high coverage. Furthermore, the equipment has good overall rigidity, allowing for rapid movement, repositioning, and milling, resulting in high processing efficiency.

[0033] As an optional implementation method, such as Figures 7-10 As shown, the ring transmission system 6 includes multiple ring transmission units 601 sequentially spliced ​​along the circumference. Each ring transmission unit 601 includes a base plate 6011, a single-segment arc toothed ring 6012, a base 6013, an adjusting block 6014, a tightening screw 6015, a first end-jump adjusting screw 6016, a second end-jump adjusting screw 6017, and a positioning pin 6018. The base plate 6011 is mounted on the base 6013 and is radially adjusted by the adjusting blocks 6014 and the tightening screw 6015 distributed on the inner and outer sides. The first end-jump adjusting screw 6016 is mounted on the base plate 6011 and is used to push the base plate 6011 outward. The second end-jump adjusting screw 6017 is mounted on the base plate 6011 and is used to lock the base plate 6011 to the base 6013. The outer annular guide rail 7 and the inner annular guide rail 8 are respectively installed on the outer and inner sides of the substrate 6011. The single-segment arc tooth ring 6012 is installed on the substrate 6011 and located between the outer annular guide rail 7 and the inner annular guide rail 8. The annular moving slide plate 12 is connected to the single-segment arc tooth ring 6012 and moves synchronously.

[0034] In the above embodiment, the ring transmission system 6 can perform radial and axial (end runout) precision adjustments on the large thin-walled cylinder end face machining system. Especially after long-term use, it facilitates precision adjustments after routine inspections of the large thin-walled cylinder end face machining system. The adjustment principle is as follows: After adjusting the coaxiality and spacing of the single-segment arc tooth ring 6012, the outer ring guide rail 7, and the inner ring guide rail 8 to the correct position, multiple single-segment outer arc guide rails and inner arc guide rails are sequentially connected in a circular pattern to form a complete ring guide rail. Multiple single-segment arc tooth rings 6012 are sequentially connected in a circular pattern to form a ring tooth ring. The outer ring guide rail 7, inner ring guide rail 8, ring tooth ring, ring motor 15, and ring reducer 16 together form the transmission system, and the geometric precision of the entire ring is adjusted. Specifically, the ring reducer 16 is mounted on the ring moving slide plate 12. The ring motor 15 is connected to the ring reducer 16 and drives the ring reducer 16 to rotate. The ring reducer 16 is equipped with an output gear, which meshes with the ring gear ring and drives the ring moving slide plate 12 to move circumferentially along the outer ring guide rail 7 and the inner ring guide rail 8. The outer ring guide rail 7 and the inner ring guide rail 8 together connect the ring moving slide plate 12 to the base 6013. At the same time, the base plate 6011 can be pushed outward by the first end-jump adjustment screw 6016 (specifically, an end-jump adjustment set screw). After the base plate 6011 moves into place, the base plate 6011 is locked onto the base 6013 by the second end-jump adjustment screw 6017 (specifically, an end-jump adjustment hexagon socket head cap screw). Then, with the help of the positioning pin 6018, the precision adjustment is completed.

[0035] As an optional implementation, one end of the card self-locking drive mechanism 5012 is fixed to the base 6013, and the moving end of the card self-locking drive mechanism 5012 is connected to the card base plate 5011; the card base plate guide rail 5013 and the card limiter 5014 are both installed on the base 6013.

[0036] As an optional implementation method, such as Figure 10 As shown, the large thin-walled cylindrical section end face processing system also includes a positioning pin 6018, and the base plate 6011 is fixedly installed on the base 6013 by the positioning pin 6018.

[0037] As an optional implementation method, such as Figure 2 As shown, the machining unit includes a radial moving component 9, an axial micro-feed component 10, and a spindle component 11. The radial moving component 9 and the axial micro-feed component 10 are both mounted on the spindle component 11, and the radial and axial movements of the radial moving component 9 and the axial micro-feed component 10 are realized by the spindle component 11, respectively.

[0038] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the figures. Furthermore, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.

[0039] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art without departing from the scope of the invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A large thin-walled cylinder segment end face machining system characterized by, The application relates to a large-scale thin-walled cylinder surface and end face machining device which comprises a base (1), an axial moving slide table (2), a main body frame (3), a ring-shaped drag chain assembly (4), an inner-protecting clamping plate (5), a ring-shaped transmission system (6), an outer ring-shaped guide rail (7), an inner ring-shaped guide rail (8), a machining unit, a ring-shaped moving slide plate (12) and a zero-point positioning device (13). The axial moving slide table (2) is slidably installed on the base (1) and moves along the central axis direction of the cylinder segment, the main body frame (3) is fixedly installed on the axial moving slide table (2), the ring-shaped drag chain assembly (4), the inner-protecting clamping plate (5), the ring-shaped transmission system (6), the outer ring-shaped guide rail (7) and the inner ring-shaped guide rail (8) are all installed on the main body frame (3), the ring-shaped drag chain assembly (4) is vertically installed on the first end surface of the main body frame (3) and is used for supporting, guiding and realizing ring-shaped movement of cables and pipelines of the machining unit, the inner-protecting clamping plate (5) is installed on the first end surface of the main body frame (3) and is used for rigidly supporting the inner surface of the large-scale thin-walled cylinder segment, the machining unit is installed in butt joint with the ring-shaped moving slide plate (12) through the zero-point positioning device (13), the machining unit is slidably installed on the outer ring-shaped guide rail (7) and the inner ring-shaped guide rail (8) through the ring-shaped moving slide plate (12), and the ring-shaped transmission system (6) is used for driving the machining unit to make circular motion along the outer ring-shaped guide rail (7) and the inner ring-shaped guide rail (8) so as to realize surface and end face machining of the large-scale thin-walled cylinder segment.

2. The large thin-walled cylinder segment end-machining system of claim 1, wherein, The ring-shaped drag chain assembly (4) comprises an inner ring guide plate (401), an outer ring guide plate (402), a bidirectional curved ring-shaped drag chain (403), a moving guide unit (404), a front baffle (405) and a rear baffle (406), the inner ring guide plate (401), the outer ring guide plate (402), the rear baffle (406) and the front baffle (405) are sequentially assembled to the first end surface of the main body frame (3), the outer ring guide plate (402), the rear baffle (406) and the front baffle (405) are sequentially connected through right-angle foot plates to form a ring-shaped drag chain guide groove, the bidirectional curved ring-shaped drag chain (403) is installed in the ring-shaped drag chain guide groove, and the two ends of the moving guide unit (404) are respectively connected with the moving end of the bidirectional curved ring-shaped drag chain (403) and the machining unit and are used for driving the bidirectional curved ring-shaped drag chain (403) to move radially.

3. The large thin-walled cylinder segment end-machining system of claim 2, wherein, The front baffle (405) is a ring structure and comprises a plurality of arc-shaped baffles which are sequentially spliced.

4. The large thin-walled cylinder segment end-machining system of claim 3, wherein, A plurality of rear baffles (406) are sequentially and spacedly distributed along the circumference of the front baffle (405).

5. The large thin-walled cylinder segment end-machining system of claim 2, wherein, The inner protection type card board (5) is a ring structure, comprising a plurality of inner protection type card board units (501) sequentially spliced in the circumferential direction, the inner protection type card board unit (501) comprising a card board base plate (5011), a card board self-locking drive mechanism (5012), a card board base plate guide rail (5013) and a card board limiter (5014), the card board self-locking drive mechanism (5012), the card board base plate guide rail (5013), the card board limiter (5014) are all arranged on the ring transmission system (6), the card board base plate (5011) is slidingly installed on the card board base plate guide rail (5013), the card board self-locking drive mechanism (5012) is used for driving the card board base plate (5011) to move radially, and the card board limiter (5014) is used for realizing the radial limiting of the card board base plate (5011).

6. The large thin-walled cylinder segment end-machining system of claim 5, wherein, Two card board base plate guide rails (5013) are respectively located at two ends of the card board base plate (5011).

7. The large thin-walled cylinder segment end-machining system of claim 5, wherein, The ring transmission system (6) comprises a plurality of ring transmission units (601) sequentially spliced in the circumferential direction, the ring transmission unit (601) comprising a base plate (6011), a single segment arc gear (6012), a base (6013), an adjusting block (6014), a tightening screw (6015), a first end jump adjusting screw (6016), a second end jump adjusting screw (6017) and a positioning pin (6018), the base plate (6011) is installed on the base (6013) and is radially adjusted by the adjusting block (6014) and the tightening screw (6015) distributed on the inner and outer sides, the first end jump adjusting screw (6016) is installed on the base plate (6011) and is used for outwardly lifting the base plate (6011), and the second end jump adjusting screw (6017) is installed on the base plate (6011) and is used for locking the base plate (6011) on the base (6013). The outer ring guide rail (7) and the inner ring guide rail (8) are respectively installed on the outer and inner sides of the base plate (6011), the single segment arc gear (6012) is installed on the base plate (6011) and located between the outer ring guide rail (7) and the inner ring guide rail (8), and the ring moving slide plate (12) is connected with the single segment arc gear (6012) and moves synchronously.

8. The large thin-walled cylinder segment end-machining system of claim 7, wherein, One end of the card board self-locking drive mechanism (5012) is fixed on the base (6013), and the moving end of the card board self-locking drive mechanism (5012) is connected with the card board base plate (5011); the card board base plate guide rail (5013) and the card board limiter (5014) are both installed on the base (6013).

9. The large thin-walled cylinder segment end-machining system of claim 7, wherein, The base plate (6011) is fixedly installed on the base (6013) through the positioning pin (6018).

10. The large thin-walled cylinder segment end-machining system of claim 1, wherein, The processing unit comprises a radial moving component (9), an axial micro-feeding component (10) and a spindle component (11), the radial moving component (9) and the axial micro-feeding component (10) are both installed on the spindle component (11).

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