Scraping device and method for repairing inner molded surface of shell end socket

Abstract

The invention belongs to the technical field of large shell molded surface repairing, and particularly provides a shell end socket inner molded surface repairing blade coating device and method.The shell end socket inner molded surface repairing blade coating device comprises a center positioning supporting assembly, the center positioning supporting assembly comprises a positioning ring, the positioning ring is installed at the end of a shell end socket, and an annular movement assembly is rotationally installed in a center hole of the positioning ring; the annular movement assembly drives the scraper assembly attached to the inner molded surface of the shell end socket to rotate. According to the invention, the manual scraping action of skilled workers can be accurately simulated, the self-adaptive fitting and blade coating of the scraping plate and the curved surface are realized, and the purposes of uniform and compact repairing layer and smooth transition with the original molded surface are achieved.

Description

Technical Field

[0001] This invention belongs to the field of large shell surface repair technology, specifically, it relates to a shell head inner surface repair and scraping device and method. Background Technology

[0002] In pressure vessels, chemical storage tanks, aerospace and other fields, the smooth flow lines of the inner surface of the head are crucial to the pressure resistance and fluid performance of the equipment. In order for the normal operation of the product, a hydrostatic test is usually carried out after manufacturing. After the test, there may be local defects that need to be repaired. At present, for local defects of the inner surface (such as scratches, thin thermal protection), manual scraping after filling material is a common method. The manual scraping method is highly dependent on the operator's experience and has problems such as unstable quality, high labor intensity and low efficiency. Automated equipment is often complex in structure and has a long debugging cycle. The processing of filler cannot simulate the smooth and high-quality repair surface obtained by a skilled worker holding a scraper. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a device and method for repairing and scraping the inner surface of a shell head, which can accurately simulate the manual scraping action of a skilled worker, realize the adaptive fitting and scraping of the scraper and the curved surface, and achieve the purpose of uniform and dense repair layer and smooth transition with the original surface.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a scraping device for repairing the inner surface of a shell head, including a central positioning support component, the central positioning support component including a positioning ring, the positioning ring being installed at the end of the shell head, a ring motion component being rotatably installed in the central hole of the positioning ring, and the ring motion component driving a scraper assembly that is in contact with the inner surface of the shell head to rotate.

[0005] In a preferred embodiment, the scraper assembly includes an adjusting support with several longitudinal slots. Fasteners pass through the longitudinal slots to fix the adjusting support to the annular motion assembly. The adjusting support is connected to an adapter plate, and the bottom of the adapter plate is connected to a positioning guide plate. One side of the positioning guide plate has a transverse guide groove, and one side of the scraper has a transverse guide protrusion that mates with the transverse guide groove. The scraper has transverse slots, and fasteners pass through the transverse slots to fix the scraper to the positioning guide plate. The bottom of the scraper is an arc-shaped structure that fits the inner surface of the shell head.

[0006] In a preferred embodiment, the annular motion component includes a cantilever, the cantilever having a longitudinal guide groove, and the adjusting support having a longitudinal protrusion on one side that cooperates with the longitudinal guide groove.

[0007] In a preferred embodiment, the positioning ring includes an outer ring and an inner ring, which are connected by several connecting plates. The inner side of the outer ring is provided with an annular step, which is adapted to the inner diameter of the opening end of the shell head.

[0008] In a preferred embodiment, a positioning sleeve is provided in the central hole of the positioning ring, and the positioning sleeve is connected to the positioning ring by fasteners. A linear bearing is provided inside the positioning sleeve, and a bearing mounting seat is provided on the outer side of the end of the positioning sleeve near the inner surface of the housing head. The annular motion component is rotatably mounted on the bearing mounting seat through a slewing bearing.

[0009] In a preferred embodiment, the annular motion assembly includes an adapter and a cantilever. The adapter includes a rotating shaft, one end of which is connected to a handwheel, and the other end is provided with a flange. The rotating shaft is rotatably installed in the center hole of the positioning ring. The upper end of the cantilever is a circular ring structure. The upper end of the cantilever is connected to the inner ring of the slewing bearing by fasteners. The flange is connected to the upper end of the cantilever. The scraper assembly is installed on the cantilever.

[0010] In a preferred embodiment, the lower end of the cantilever is provided with a support seat, the support seat is provided with a ball bearing, and the inner side of the positioning ring is provided with an annular guide groove adapted to the ball bearing.

[0011] In a preferred embodiment, a measuring component is also included. The measuring component is located directly above the scraper assembly. The measuring component includes a measuring shaft connected to the rotation center of the annular motion assembly. The measuring shaft extends horizontally into the housing head and beyond the end of the scraper assembly. An adapter is provided at the end of the measuring shaft, and an infrared projector is installed on the adapter to emit infrared rays into the inner surface of the housing head as a measuring reference for measuring the axial position of the scraper assembly.

[0012] In a preferred embodiment, a sensor adapter is provided on the measuring shaft, and a distance sensor is installed on the sensor adapter. The distance sensor is located directly above the scraper and is used to measure the distance from the scraper.

[0013] A method for repairing and coating the inner surface of a shell head, using the aforementioned shell head inner surface repair and coating device, includes the following steps: Step 1, Defect Scanning and Scraper Machining: A three-dimensional model of the inner surface of the shell head is obtained through large-space scanning. The defect area is determined by comparing it with the standard CAD model. Based on the defect contour and the curvature of the inner surface of the shell head, a scraper with an adapted arc structure at the bottom is obtained by CNC machining. Step 2, Device Assembly and Positioning: Place the scraper assembly and some parts of the annular motion assembly of the inner surface repair and scraping device of the shell head inside the shell head. Use the head joint as a reference to complete the device assembly. The annular step of the positioning ring is adapted to the inner diameter of the opening end of the shell head. Fix the positioning ring to the end of the shell head with fasteners. Step 3: Scraper position adjustment: Loosen the fasteners at the longitudinal waist hole of the adjusting support and adjust the longitudinal position of the scraper assembly along the longitudinal guide groove of the cantilever; loosen the fasteners at the transverse waist hole of the scraper and adjust the transverse position of the scraper along the transverse guide groove of the positioning guide plate so that the arc-shaped structure at the bottom of the scraper fits the inner surface of the shell head. Step 4: Applying putty to the defective area: Rotate the handwheel to drive the ring motion component to rotate the scraper component around the center of the positioning ring, observe the location of the defective area, and manually apply repair putty evenly to the defective area on the inner surface of the shell head. Step 5: Uniform speed scraping and repair: Keep the scraper in contact with the inner surface of the shell head, rotate the handwheel at a uniform speed, and drive the cantilever and scraper assembly to rotate along a circular track through the adapter to achieve the smoothing and compaction of the putty; if insufficient putty or excessive local height is detected, stop rotating and apply more putty, then repeat this step to scrape again. Step 6: Curing and Device Reset: After the repair putty has cured, loosen the fasteners fixing the positioning ring and the housing head, reset all parts of the device, and remove the device.

[0014] The present invention provides a device and method for repairing and scraping the inner surface of a shell head, which has the following beneficial effects: 1. The shell head inner surface repair and scraping device and method provided by the present invention, by finely adjusting the position of the scraper and the repair surface, after filling the defect location, the scraper and the curved surface adaptively fit and scrape, solves the problems of manual scraping method which is highly dependent on the operator's experience, has unstable quality, high labor intensity and low efficiency, and achieves the purpose of uniform and dense repair layer and smooth transition with the original surface.

[0015] 2. The bottom of the scraper assembly is an arc-shaped structure that matches the curvature of the inner surface of the shell head. It can accurately replicate the curved shape of the inner surface of the head. When scraping, it can simulate the manual scraping action of a skilled worker, so that the repair putty can smoothly transition with the original surface. It solves the problems of poor adhesion and uneven thickness of the repair layer in traditional manual scraping. It effectively prevents the generation of bubbles and voids, has high repair strength, and obtains a high-quality surface with a smooth transition with the original surface in one go. The repair layer is uniform and dense, and the pressure resistance and fluid performance recovery effect are significant.

[0016] 3. The longitudinal (radial) position of the scraper assembly is adjusted by the longitudinal waist hole and the longitudinal guide groove of the cantilever. The scraper is finely adjusted in the lateral (axial) position by the transverse waist hole and the transverse guide groove of the positioning guide plate. The scraper position can be precisely adjusted for defect areas of different positions and sizes without the need to replace the special scraper. It has strong adaptability and ensures that the defect area is completely covered by the scraper.

[0017] 4. The ring motion component is connected to the bearing mounting seat through a slewing bearing. The ball bearing at the lower end of the cantilever is embedded in the annular guide groove of the positioning ring, forming a simply supported beam structure with an upper slewing bearing and a lower ball bearing. There is no jamming or offset during rotation. During the rotation of the scraper assembly driven by the handwheel around the center, the scraping speed and pressure are uniform and controllable, avoiding repair defects caused by fluctuations in force and speed during manual scraping.

[0018] 5. The linear bearing inside the positioning sleeve effectively reduces the rotational friction damping of the shaft, making it labor-saving and convenient to drive with the handwheel. A single person can complete the scraping operation, accurately simulating the circular scraping trajectory of a manual scraper, while avoiding fatigue problems caused by long-term manual operation.

[0019] 6. The inner side of the outer ring of the positioning ring is provided with an annular step, which is precisely matched with the inner diameter of the opening end of the shell head. The device can be fixed to the end of the head by fasteners. During installation, the head joint is used as the reference, and no complicated reference calibration is required.

[0020] 7. The device is divided into four main components: central positioning support, circular motion, scraper, and measurement. Each component is connected by fasteners and can be disassembled and stored separately for easy installation.

[0021] 8. The work efficiency is much greater than that of traditional manual scraping, and by changing the standard scraper and making adjustments, it can adapt to repair tasks with different curvatures and different materials. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 Cross-sectional view of the centrally located support component; Figure 4 A three-dimensional structural diagram of the centrally positioned support component; Figure 5 This is a cross-sectional view of the ring motion component; Figure 6 This is a three-dimensional structural diagram of the ring-shaped motion component; Figure 7 This is a schematic diagram of the scraper assembly structure; Figure 8 This is a three-dimensional structural diagram of the scraper assembly; Figure 9 A structural schematic diagram of the scraper assembly from another angle; Figure 10 This is a schematic diagram of the test component structure; Figure 11 This is a 3D structural diagram of the test component; In the figure: center positioning support assembly 100, positioning ring 110, outer ring 111, inner ring 112, connecting plate 113, annular guide groove 114, annular step 115, positioning sleeve 120, linear bearing 130, bearing mounting seat 140; Circular motion assembly 200, cantilever 210, longitudinal guide groove 211, slewing bearing 220, adapter 230, rotating shaft 231, flange 232, support base 240, ball bearing 250, handwheel 260; Scraper assembly 300, adjusting support 310, longitudinal waist hole 311, longitudinal protrusion 312, adapter plate 320, positioning guide plate 330, transverse guide groove 331, scraper 340, transverse guide protrusion 341, transverse waist hole 342. Measurement component 400, measuring axis 410, adapter 420, infrared projector 430, sensor adapter 440, distance sensor 450; Shell head 500. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0024] Example 1: A device for repairing and scraping the inner surface of a shell head, such as Figure 1 and 2 The device includes a central positioning support assembly 100, which includes a positioning ring 110, which is installed at the end of the housing head 500.

[0025] like Figure 3 and 4 As shown, the positioning ring 110 includes an outer ring 111 and an inner ring 112, which are made of aluminum alloy. The outer ring 111 and the inner ring 112 are connected by a number of connecting plates 113. In this embodiment, there are 9 sets of connecting plates 113. The connecting plates 113 divide the space between the outer ring 111 and the inner ring 112 into windows, which serves to reduce weight and facilitate observation.

[0026] The inner side of the outer ring 111 is provided with an annular step 115, which is adapted to the inner diameter of the opening end of the housing head 500. The positioning ring 110 is positioned with the housing joint by the step and the end face, and is connected and fixed to the housing head 500 by screws. Its function is to serve as the installation reference for other components.

[0027] Preferred, such as Figures 3-4 As shown, a positioning sleeve 120 is provided in the central hole of the positioning ring 110. The positioning sleeve 120 is connected to the positioning ring 110 by fasteners. The positioning sleeve 120 is made of wear-resistant copper alloy material and is positioned by the central hole of the positioning ring. It is connected and fixed to the positioning ring 110 by screws. Its function is to serve as the installation reference for the bearing mounting seat 140 and the linear bearing 130.

[0028] The positioning sleeve 120 is equipped with a linear bearing 130, specifically a linear bearing with a clamping handle. The linear bearing 130 is positioned based on the inner hole of the positioning sleeve and is connected and fixed to the positioning sleeve by screws. The linear bearing has low frictional resistance and good static and dynamic performance, which can effectively reduce driving friction damping. Its function is to serve as the positioning reference for the ring motion component 200. The clamping handle can lock the ring motion component at any angle.

[0029] A bearing mounting seat 140 is provided on the outer side of the end of the positioning sleeve 120 near the inner surface of the housing head 500. The bearing mounting seat 140 is made of stainless steel and is positioned by the outer cylindrical surface of the positioning sleeve 120. It is connected and fixed to the positioning ring by screws. Its function is to serve as the installation reference for the slewing bearing 220.

[0030] The annular motion component 200 is rotatably mounted on the bearing mounting seat 140 via the slewing bearing 220, and the annular motion component 200 drives the scraper assembly 300, which is in contact with the inner surface of the housing head 500, to rotate.

[0031] Preferred, such as Figure 7-9 As shown, the scraper assembly 300 includes an adjustment support 310, which has several longitudinal slots 311. Fasteners pass through the longitudinal slots 311 to fix the adjustment support 310 to the annular motion assembly 200. The adjustment support 310 is connected to the adapter plate 320. The bottom of the adapter plate 320 is connected to the positioning guide plate 330. The positioning guide plate 330 has a transverse guide groove 331 on one side. The scraper 340 has a transverse guide protrusion 341 that cooperates with the transverse guide groove 331 on one side. The scraper 340 has a transverse slot 342. Fasteners pass through the transverse slot 342 to fix the scraper 340 to the positioning guide plate 330. The bottom of the scraper 340 is an arc-shaped structure that fits with the inner surface of the shell head 500. Specifically, the scraper 340 includes a right-angled edge on the upper side and one side, and an arc-shaped edge at the bottom that fits with the inner surface of the shell head 500.

[0032] Radial and axial adjustments are achieved by adjusting the support and positioning guide plate, respectively. The scraper assembly 300 is used to apply repair material to the inner surface of the end cap and repair defects.

[0033] like Figure 5-6 As shown, the annular motion component 200 includes a cantilever 210, which is provided with a longitudinal guide groove 211. The adjusting support 310 has a longitudinal protrusion 312 on one side that cooperates with the longitudinal guide groove 211.

[0034] The cantilever 210 is formed from sheet metal. One end of the cantilever 210 is a ring structure with through holes and threaded holes. It is connected and fixed to the inner ring of the slewing bearing 220 by fasteners. The outer ring of the slewing bearing 220 is positioned with the bearing mounting base 140 and connected and fixed to the bearing mounting base 140 by fasteners. The slewing bearing 220 is the rotation reference of the ring motion component.

[0035] A longitudinal guide groove 211 is provided in the middle of the cantilever, which serves as the installation reference for the scraper assembly 300. The radial position of the scraper can be adjusted through the longitudinal guide groove 211.

[0036] The ring motion assembly 200 includes a connector 230 and a cantilever 210. The connector 230 includes a rotating shaft 231. One end of the rotating shaft 231 is connected to a handwheel 260, and the other end is provided with a flange 232. The rotating shaft 231 is rotatably installed in the center hole of the positioning ring 110. The upper end of the cantilever 210 has a circular structure. The upper end of the cantilever 210 is connected to the inner ring of the slewing bearing 220 by fasteners. The flange 232 is connected to the upper end of the cantilever 210. The scraper assembly 300 is installed on the cantilever 210.

[0037] The adapter 230 is machined from a metal rod and has a flange shaft structure. It is positioned by the outer circle of the stepped shaft and the linear bearing sleeve with a clamping handle in the center positioning support assembly 100, and is fixed to the cantilever 210 by fasteners. One end of the adapter has a step and a keyway. The handwheel 260 is positioned to the adapter 230 by the outer circle of the small step and the key, and is fixed to the adapter 230 by fasteners. The handwheel 260 is used for ring-driven scraping. The adapter 230 transmits the driving force of the handwheel 260 to the cantilever 210, which can drive the scraper assembly 300 to achieve axial scraping. The clamping handle on the linear bearing sleeve allows for locking at any position.

[0038] Preferably, the lower end of the cantilever 210 is provided with a support seat 240, the support seat 240 is provided with a ball bearing 250, and the inner side of the positioning ring 110 is provided with an annular guide groove 114 adapted to the ball bearing 250.

[0039] The support base 240 is made of metal sheet and is connected and fixed to the cantilever 210 by fasteners. The support base 240 has a pin positioning hole in the center. The pin, ball bearing 250 and support base are connected and fixed by fasteners. The ball bearing 250 is adjusted according to the annular guide groove 114 and guided by the annular guide groove 114. Together with the rotary bearing 220 in the annular motion component 200, it forms a simply supported beam. Its function is to increase the rigidity of the cantilever 210 during annular motion.

[0040] Example 2: In this embodiment, a measurement component 400 is also included, such as... Figure 10-11As shown, the measuring component 400 is located directly above the scraper assembly 300. The measuring component 400 includes a measuring shaft 410 connected to the rotation center of the ring motion assembly 200. The measuring shaft 410 extends horizontally into the housing head 500 and extends beyond the end of the scraper assembly 300. The end of the measuring shaft 410 is provided with an adapter 420. An infrared projector 430 is installed on the adapter 420 to emit infrared rays into the inner surface of the housing head 500 as a measurement reference for measuring the axial position of the scraper assembly 300.

[0041] The measuring shaft 410 is provided with a sensor adapter 440, and a distance sensor 450 is installed on the sensor adapter 440. The distance sensor 450 is located directly above the scraper 340 and is used to measure the distance from the scraper 340.

[0042] The measuring shaft 410 is a hollow aluminum shaft with internal threads at both ends. One end is connected to the adapter 230 in the ring motion assembly 200. The sensor adapter 440 is positioned with the outer circle of the hollow aluminum shaft as a reference and is fastened to the hollow aluminum shaft by fasteners. The function of the testing assembly is to measure the radial position from the center to the scraper and the axial position from the end face of the scraper to the positioning surface of the end cap joint through the ranging sensor.

[0043] A positioning ring 110 is installed on the end cap. The inner cavity of the end cap is scanned in a large space, and a three-dimensional surface of the end cap is generated through reverse modeling. Eight projection lines are drawn, each at 45° intervals. The middle curvature curve is selected from the eight fitted curves as the outer contour surface of the scraper. The transition position from the end face of the positioning ring 110 to the straight section is the theoretical length of the measuring shaft 410. The transition position from the positioning ring axis to the transition position between the scraper and the straight section is the theoretical radial dimension. The method and steps for measuring the radial position from the center of the distance sensor to the scraper are as follows: First, install the scraper in place according to the assembly drawing. The maximum gap between the outer surface of the scraper and the shell after fitting should be less than 1mm. Then, use the distance sensor 450 to measure whether the distance from the center axis to the scraper conforms to the theoretical dimension ±1mm. If not, adjust the radial position of the scraper using the longitudinal guide groove 211 of the cantilever 210. Methods and steps for measuring the axial position from the end face of the scraper to the positioning surface of the end cap: First, measure whether the distance from the infrared projector 430 to the end face of the positioning ring 110 conforms to the theoretical size ±1mm; then, measure whether the distance from the infrared projection line of the infrared projector 4300 to the end face of the scraper conforms to the theoretical size ±1mm using a steel ruler. If it does not conform, adjust the axial position of the scraper through the strip hole on the positioning guide plate 330.

[0044] Example 3: A method for repairing and coating the inner surface of a shell head, using the shell head repair and coating device described in Embodiment 1 or Embodiment 2, includes the following steps: Step 1, Defect Scanning and Scraper Machining: A three-dimensional model of the inner surface of the shell head 500 is obtained through large-space scanning. The defect area is determined by comparing it with the standard CAD model. Based on the defect contour and the curvature of the inner surface of the shell head 500, a scraper 340 with an adapted arc structure at the bottom is obtained by CNC machining.

[0045] Step 2, Device Assembly and Positioning: Place the scraper assembly 300 and some parts of the annular motion assembly 200 of the inner surface repair and scraping device of the shell head 500 inside the shell head 500. Complete the device assembly with the head joint as the reference. The annular step 115 of the positioning ring 110 is adapted to the inner diameter of the opening end of the shell head 500. Fix the positioning ring 110 to the end of the shell head 500 with fasteners.

[0046] Step 3: Scraper position adjustment: By loosening the fasteners at the longitudinal waist hole 311 of the adjusting support 310, adjust the longitudinal position of the scraper assembly 300 along the longitudinal guide groove 211 of the cantilever 210; loosen the fasteners at the transverse waist hole 342 of the scraper 340, adjust the transverse position of the scraper 340 along the transverse guide groove 331 of the positioning guide plate 330, so that the arc-shaped structure at the bottom of the scraper 340 fits the inner surface of the shell head 500.

[0047] Step 4: Applying repair putty to the defective area: Rotate the handwheel 260 to drive the ring motion component 200 to rotate the scraper component 300 around the center of the positioning ring 110. Observe the location of the defective area and manually apply repair putty evenly to the defective area on the inner surface of the shell head 500.

[0048] Step 5: Uniform speed scraping and repair: Keep the scraper 340 in contact with the inner surface of the shell end cap 500, rotate the handwheel 260 at a uniform speed, and drive the cantilever 210 and scraper assembly 300 to rotate along a circular track through the adapter 230 to achieve the smoothing and compaction of the putty; if insufficient putty or excessive local height is detected, stop rotating and apply more putty, then repeat this step to scrape again.

[0049] Step 6: Curing and Device Reset: After the repair putty has cured, loosen the fasteners fixing the positioning ring 110 and the housing head 500, reset all parts of the device, and remove the device.

[0050] The shell head internal surface repair and coating device and method provided by this invention, through fine adjustment of the scraper's position relative to the repair surface, and after filling the defect location, solves the problems of manual scraping methods, which are highly dependent on operator experience, resulting in unstable quality, high labor intensity, and low efficiency. This achieves a uniform and dense repair layer with a smooth transition to the original surface. The shell head internal surface repair and coating device provided by this invention is highly efficient, simple to operate, and easy to use. The device has been successfully verified and has achieved the expected results.

[0051] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for repairing and scraping the inner surface of a shell end cap, characterized in that, The device includes a central positioning support assembly (100), which includes a positioning ring (110) installed at the end of the housing head (500). A ring motion assembly (200) is rotatably installed in the central hole of the positioning ring (110). The ring motion assembly (200) drives a scraper assembly (300) that is in contact with the inner surface of the housing head (500) to rotate.

2. The device for repairing and scraping the inner surface of a shell head according to claim 1, characterized in that, The scraper assembly (300) includes an adjustment support (310), which has several longitudinal waist holes (311). Fasteners pass through the longitudinal waist holes (311) to fix the adjustment support (310) to the annular motion assembly (200). The adjustment support (310) is connected to the adapter plate (320). The bottom of the adapter plate (320) is connected to the positioning guide plate (330). The positioning guide plate (330) has a transverse guide groove (331) on one side. The scraper (340) has a transverse guide protrusion (341) on one side that cooperates with the transverse guide groove (331). The scraper (340) has a transverse waist hole (342). Fasteners pass through the transverse waist hole (342) to fix the scraper (340) to the positioning guide plate (330). The bottom of the scraper (340) is an arc-shaped structure that fits the inner surface of the shell head (500).

3. The device for repairing and scraping the inner surface of a shell head according to claim 2, characterized in that, The ring motion assembly (200) includes a cantilever (210), which is provided with a longitudinal guide groove (211). The adjusting support (310) has a longitudinal protrusion (312) on one side that cooperates with the longitudinal guide groove (211).

4. The device for repairing and scraping the inner surface of a shell head according to claim 1, characterized in that, The positioning ring (110) includes an outer ring (111) and an inner ring (112). The outer ring (111) and the inner ring (112) are connected by several connecting plates (113). The inner side of the outer ring (111) is provided with an annular step (115), which is adapted to the inner diameter of the opening end of the shell head (500).

5. The device for repairing and scraping the inner surface of a shell end cap according to claim 1, characterized in that, The positioning ring (110) has a positioning sleeve (120) in the center hole. The positioning sleeve (120) is connected to the positioning ring (110) by fasteners. The positioning sleeve (120) has a linear bearing (130) inside. The outer side of the end of the positioning sleeve (120) near the inner surface of the housing head (500) has a bearing mounting seat (140). The ring motion component (200) is rotatably mounted on the bearing mounting seat (140) through a slewing bearing (220).

6. The device for repairing and scraping the inner surface of a shell end cap according to claim 5, characterized in that, The ring motion assembly (200) includes a connector (230) and a cantilever (210). The connector (230) includes a rotating shaft (231). One end of the rotating shaft (231) is connected to a handwheel (260), and the other end is provided with a flange (232). The rotating shaft (231) is rotatably installed in the center hole of the positioning ring (110). The upper end of the cantilever (210) is a circular ring structure. The upper end of the cantilever (210) is connected to the inner ring of the slewing bearing (220) by fasteners. The flange (232) is connected to the upper end of the cantilever (210). The scraper assembly (300) is installed on the cantilever (210).

7. The device for repairing and scraping the inner surface of a shell head according to claim 6, characterized in that, The lower end of the cantilever (210) is provided with a support seat (240), and a ball bearing (250) is provided on the support seat (240). The inner side of the positioning ring (110) is provided with an annular guide groove (114) that is compatible with the ball bearing (250).

8. The device for repairing and scraping the inner surface of a shell head according to claim 2, characterized in that, It also includes a measuring component (400), which is located directly above the scraper assembly (300). The measuring component (400) includes a measuring shaft (410) connected to the rotation center of the ring motion assembly (200). The measuring shaft (410) extends horizontally into the housing head (500) and beyond the end of the scraper assembly (300). The end of the measuring shaft (410) is provided with an adapter (420). An infrared projector (430) is installed on the adapter (420) to emit infrared rays into the inner surface of the housing head (500) as a measurement reference for measuring the axial position of the scraper assembly (300).

9. A shell end cap inner surface repair and scraping device according to claim 8, characterized in that, The measuring shaft (410) is provided with a sensor adapter (440), and a distance sensor (450) is installed on the sensor adapter (440). The distance sensor (450) is located directly above the scraper (340) and is used to measure the distance from the scraper (340).

10. A method for repairing and coating the inner surface of a shell head, characterized in that, The operation using the shell head inner surface repair and scraping device according to any one of claims 1 to 9 includes the following steps: Step 1, Defect Scanning and Scraper Machining: A three-dimensional model of the inner surface of the shell head (500) is obtained by large-space scanning. The defect area is determined by comparing it with the standard CAD model. Based on the defect contour and the curvature of the inner surface of the shell head (500), a scraper (340) with an adapted arc structure at the bottom is obtained by CNC machining. Step 2, Device assembly and positioning: Place the scraper assembly (300) and some parts of the annular motion assembly (200) of the inner surface repair and scraping device of the shell head into the shell head (500), and complete the device assembly with the head joint as the reference. The annular step (115) of the positioning ring (110) is adapted to the inner diameter of the opening end of the shell head (500), and the positioning ring (110) is fixed to the end of the shell head (500) by fasteners. Step 3: Scraper position adjustment: By loosening the fasteners at the longitudinal waist hole (311) of the adjusting support (310), adjust the longitudinal position of the scraper assembly (300) along the longitudinal guide groove (211) of the cantilever (210); loosen the fasteners at the transverse waist hole (342) of the scraper (340), adjust the transverse position of the scraper (340) along the transverse guide groove (331) of the positioning guide plate (330), so that the arc-shaped structure at the bottom of the scraper (340) fits the inner surface of the shell head (500); Step 4: Applying putty to the defect area: Turn the handwheel (260) to drive the ring motion component (200) to drive the scraper component (300) to rotate around the center of the positioning ring (110), observe the location of the defect area, and manually apply repair putty evenly to the defect area on the inner surface of the shell head (500); Step 5: Uniform speed scraping and repair: Keep the scraper (340) in contact with the inner surface of the shell end cap (500), rotate the handwheel (260) at a uniform speed, and drive the cantilever (210) and scraper assembly (300) to rotate along the circular track through the adapter (230) to achieve the smoothing and compaction of the putty; if the putty is found to be insufficient or locally too high, stop rotating and apply more putty, and then repeat this step to scrape again; Step 6: Curing and Device Reset: After the repair putty has cured, loosen the fasteners fixing the positioning ring (110) and the housing head (500), reset all parts of the device, and remove the device.

Images